From: Adrian McMenamin <[email protected]>
This patch adds support for the GD-Rom drive, SEGA's proprietary implementation of an IDE CD Rom for the SEGA Dreamcast. This driver implements Sega's Packet Interface (SPI) - at least partially. It will also read disks in SEGA's propreitary GD format.
Unlike previous drivers (which were never in mainline) this uses DMA and not PIO to read disks. It is a new driver, not a refactoring of old drivers.
Signed-off by: Adrian McMenamin <[email protected]>
(Jens - this awaits your ack before going in Paul's queue for the 2.6.25 window)
--------
diff -rupN linux-2.6/drivers/block/Kconfig linux-2.6-new/drivers/block/Kconfig
--- linux-2.6/drivers/block/Kconfig 2008-01-10 22:25:43.000000000 +0000
+++ linux-2.6-new/drivers/block/Kconfig 2008-01-10 23:05:10.000000000 +0000
@@ -105,6 +105,17 @@ config PARIDE
"MicroSolutions backpack protocol", "DataStor Commuter protocol"
etc.).
+config GDROM
+ tristate "SEGA Dreamcast GD-ROM drive"
+ depends on SH_DREAMCAST
+ help
+ A standard SEGA Dreamcast comes with a modified CD ROM drive called a
+ "GD-ROM" by SEGA to signify it is capable of reading special disks
+ with up to 1 GB of data. This drive will also read standard CD ROM
+ disks. Select this option to access any disks in your GD ROM drive.
+ Most users will want to say "Y" here.
+ You can also build this as a module which will be called gdrom.ko
+
source "drivers/block/paride/Kconfig"
config BLK_CPQ_DA
diff -rupN linux-2.6/drivers/cdrom/gdrom.c linux-2.6-new/drivers/cdrom/gdrom.c
--- linux-2.6/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6-new/drivers/cdrom/gdrom.c 2008-01-10 23:05:11.000000000 +0000
@@ -0,0 +1,786 @@
+/* GD ROM driver for the SEGA Dreamcast
+ * copyright Adrian McMenamin, 2007
+ * With thanks to Marcus Comstedt and Nathan Keynes
+ * for work in reversing PIO and DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/mach/sysasic.h>
+
+#define GDROM_DEV_NAME "gdrom"
+#define GD_SESSION_OFFSET 150
+
+/* GD Rom commands */
+#define GDROM_COM_SOFTRESET 0x08
+#define GDROM_COM_EXECDIAG 0x90
+#define GDROM_COM_PACKET 0xA0
+#define GDROM_COM_IDDEV 0xA1
+
+/* GD Rom registers */
+#define GDROM_BASE_REG 0xA05F7000
+#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
+#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
+#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
+#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
+#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
+#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
+#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
+#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
+#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
+#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
+
+#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
+#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
+#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
+#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
+#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
+#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
+#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
+
+#define GDROM_HARD_SECTOR 2048
+#define BLOCK_LAYER_SECTOR 512
+#define GD_TO_BLK 4
+
+static const struct {
+ int sense_key;
+ const char * const text;
+} sense_texts[] = {
+ {NO_SENSE, "OK"},
+ {RECOVERED_ERROR, "Recovered from error"},
+ {NOT_READY, "Device not ready"},
+ {MEDIUM_ERROR, "Disk not ready"},
+ {HARDWARE_ERROR, "Hardware error"},
+ {ILLEGAL_REQUEST, "Command has failed"},
+ {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+ {DATA_PROTECT, "Data protection error"},
+ {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static wait_queue_head_t command_queue;
+static wait_queue_head_t request_queue;
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+ unsigned int entry[99];
+ unsigned int first, last;
+ unsigned int leadout;
+};
+
+static struct gdrom_unit {
+ struct gendisk *disk;
+ struct cdrom_device_info *cd_info;
+ int status;
+ int pending;
+ int transfer;
+ char disk_type;
+ struct gdromtoc *toc;
+ struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+ char mid;
+ char modid;
+ char verid;
+ char padA[13];
+ char mname[16];
+ char modname[16];
+ char firmver[16];
+ char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static void gdrom_wait_clrbusy(void)
+{
+ /* long timeouts - typical for a CD Rom */
+ unsigned long timeout = jiffies + HZ * 60;
+ while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && (time_before(jiffies, timeout)))
+ cpu_relax();
+}
+
+static void gdrom_wait_busy_sleeps(void)
+{
+ unsigned long timeout;
+ /* Wait to get busy first */
+ timeout = jiffies + HZ * 60;
+ while (!gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ /* Now wait for busy to clear */
+ gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+ int c;
+ short *data = buf;
+ gdrom_wait_clrbusy();
+ ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+ gdrom_wait_busy_sleeps();
+ /* now read in the data */
+ for (c = 0; c < 40; c++)
+ data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+ short *cmd = spi_string;
+ /* ensure IRQ_WAIT is set */
+ ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+ /* specify how many bytes we expect back */
+ ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+ ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+ /* other parameters */
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_ERROR_REG);
+ /* Wait until we can go */
+ gdrom_wait_clrbusy();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ while (!gdrom_data_request())
+ cpu_relax();
+ outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+ gdrom_hardreset(gd.cd_info);
+ gdrom_wait_clrbusy();
+ ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+ gdrom_wait_busy_sleeps();
+ return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+ struct packet_command *spin_command;
+ spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!spin_command)
+ return -ENOMEM;
+ spin_command->cmd[0] = 0x70;
+ spin_command->cmd[2] = 0x1f;
+ spin_command->buflen = 0;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, spin_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
+ gd.pending = 0;
+ kfree(spin_command);
+ if (gd.status & 0x01) {
+ /* log an error */
+ gdrom_getsense(NULL);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8 ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+ int tocsize;
+ struct packet_command *toc_command;
+ toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!toc_command)
+ return -ENOMEM;
+ tocsize = sizeof(struct gdromtoc);
+ toc_command->cmd[0] = 0x14;
+ toc_command->cmd[1] = session;
+ toc_command->cmd[3] = tocsize >> 8;
+ toc_command->cmd[4] = tocsize & 0xff;
+ toc_command->buflen = tocsize;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, toc_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
+ gd.pending = 0;
+ insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+ kfree(toc_command);
+ if (gd.status & 0x01)
+ return -EINVAL;
+ return 0;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+ return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+ return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+ return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info, struct cdrom_multisession *ms_info)
+{
+ int fentry, lentry, track, data, tocuse, err;
+ if (!gd.toc)
+ return -ENOMEM;
+ tocuse = 1;
+ /* Check if GD-ROM */
+ err = gdrom_readtoc_cmd(gd.toc, 1);
+ /* Not a GD-ROM so check if standard CD-ROM */
+ if (err) {
+ tocuse = 0;
+ err = gdrom_readtoc_cmd(gd.toc, 0);
+ if (err) {
+ printk(KERN_INFO "GDROM: Could not get CD table of contents\n");
+ return -ENXIO;
+ }
+ }
+
+ fentry = get_entry_track(gd.toc->first);
+ lentry = get_entry_track(gd.toc->last);
+ /* Find the first data track */
+ track = get_entry_track(gd.toc->last);
+ do {
+ data = gd.toc->entry[track - 1];
+ if (get_entry_q_ctrl(data))
+ break; /* ie a real data track */
+ track--;
+ } while (track >= fentry);
+
+ if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+ gdrom_getsense(NULL);
+ printk(KERN_INFO "GDROM: No data on the last session of the CD\n");
+ return -ENXIO;
+ }
+
+ ms_info->addr_format = CDROM_LBA;
+ ms_info->addr.lba = get_entry_lba(data);
+ ms_info->xa_flag = 1;
+ return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+ /* spin up the disk */
+ return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* read the sense key */
+ char sense = ctrl_inb(GDROM_ERROR_REG);
+ sense &= 0xF0;
+ if (sense == 0)
+ return CDS_DISC_OK;
+ if (sense == 0x20)
+ return CDS_DRIVE_NOT_READY;
+ /* default */
+ return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* check the sense key */
+ return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+ int count;
+ ctrl_outl(0x1fffff, GDROM_RESET_REG);
+ for (count = 0xa0000000; count < 0xa0200000; count += 4)
+ ctrl_inl(count);
+ return 0;
+}
+
+/* keep the function looking like the universal CD Rom specification - returning int*/
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command)
+{
+ gdrom_spicommand(&command->cmd, command->buflen);
+ return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+ struct packet_command *sense_command;
+ short sense[5];
+ int sense_key;
+ if (gd.pending)
+ return -EIO;
+
+ /* allocate command and buffer */
+ sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!sense_command)
+ return -ENOMEM;
+
+ sense_command->cmd[0] = 0x13;
+ sense_command->cmd[4] = 10;
+ sense_command->buflen = 10;
+
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, sense_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
+ gd.pending = 0;
+ kfree(sense_command);
+ insw(PHYSADDR(GDROM_DATA_REG), &sense, 5);
+ if (sense[1] & 40) {
+ printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+ return -EIO;
+ }
+ sense_key = sense[1] & 0x0F;
+ if (sense_key < ARRAY_SIZE(sense_texts))
+ printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+ else
+ printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+
+ if (bufstring) /* return additional sense data */
+ memcpy(bufstring, &sense[4], 2); /* return additional sense data */
+
+ if (sense_key < 2)
+ return 0;
+ return -EIO;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+ .open = gdrom_open,
+ .release = gdrom_release,
+ .drive_status = gdrom_drivestatus,
+ .media_changed = gdrom_mediachanged,
+ .get_last_session = gdrom_get_last_session,
+ .reset = gdrom_hardreset,
+ .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+ CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+ .n_minors = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+ return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+ return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+ return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file, unsigned cmd, unsigned long arg)
+{
+ return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+ .owner = THIS_MODULE,
+ .open = gdrom_bdops_open,
+ .release = gdrom_bdops_release,
+ .media_changed = gdrom_bdops_mediachanged,
+ .ioctl = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.pending != 1)
+ return IRQ_HANDLED;
+ gd.pending = 0;
+ wake_up_interruptible(&command_queue);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.transfer != 1)
+ return IRQ_HANDLED;
+ gd.transfer = 0;
+ wake_up_interruptible(&request_queue);
+ return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+ int err;
+ init_waitqueue_head(&command_queue);
+ err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, IRQF_DISABLED, "gdrom_command", &gd);
+ if (err)
+ return err;
+ init_waitqueue_head(&request_queue);
+ err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, IRQF_DISABLED, "gdrom_dma", &gd);
+ if (err)
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+ int err, block, block_cnt;
+ struct packet_command *read_command;
+ struct list_head *elem, *next;
+ struct request *req;
+ unsigned long timeout;
+ if (list_empty(&gdrom_deferred))
+ return;
+ read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!read_command)
+ return; /* get more memory later? */
+ read_command->cmd[0] = 0x30;
+ read_command->cmd[1] = 0x20;
+ spin_lock(&gdrom_lock);
+ list_for_each_safe(elem, next, &gdrom_deferred) {
+ req = list_entry(elem, struct request, queuelist);
+ spin_unlock(&gdrom_lock);
+ block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = req->nr_sectors/GD_TO_BLK;
+ ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+ ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+ ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+ ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+ read_command->cmd[2] = (block >> 16) & 0xFF;
+ read_command->cmd[3] = (block >> 8) & 0xFF;
+ read_command->cmd[4] = block & 0xFF;
+ read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+ read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+ read_command->cmd[10] = block_cnt & 0xFF;
+ /* set for DMA */
+ ctrl_outb(1, GDROM_ERROR_REG);
+ /* other registers */
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_BCL_REG);
+ ctrl_outb(0, GDROM_BCH_REG);
+ ctrl_outb(0, GDROM_DSEL_REG);
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ /* In multiple DMA transfers need to wait */
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ gd.pending = 1;
+ gd.transfer = 1;
+ outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+ timeout = jiffies + HZ / 2;
+ while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+ time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(1, GDROM_DMA_STATUS_REG);
+ /* 5 second error margin here seems more reasonable */
+ wait_event_interruptible_timeout(request_queue, gd.transfer == 0, HZ * 5);
+ err = ctrl_inb(GDROM_DMA_STATUS_REG);
+ err = gd.transfer;
+ gd.transfer = 0;
+ gd.pending = 0;
+ /* now seek to take the request spinlock
+ * before handling ending the request */
+ spin_lock(&gdrom_lock);
+ list_del_init(&req->queuelist);
+ end_dequeued_request(req, 1 - err);
+ }
+ spin_unlock(&gdrom_lock);
+ kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+ /* dequeue, add to list of deferred work
+ * and then schedule workqueue */
+ blkdev_dequeue_request(req);
+ list_add_tail(&req->queuelist, &gdrom_deferred);
+ schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+ struct request *req;
+ while ((req = elv_next_request(rq)) != NULL) {
+ if (!blk_fs_request(req)) {
+ printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+ end_request(req, 0);
+ }
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_NOTICE "GDROM: Read only device - write request ignored\n");
+ end_request(req, 0);
+ }
+ if (req->nr_sectors)
+ gdrom_request_handler_dma(req);
+ else
+ end_request(req, 0);
+ }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+ struct gdrom_id *id;
+ char *model_name, *manuf_name, *firmw_ver;
+ int err = -ENOMEM;
+ /* query device ID */
+ id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+ if (!id)
+ return err;
+ gdrom_identifydevice(id);
+ model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+ if (!model_name)
+ goto free_id;
+ manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+ if (!manuf_name)
+ goto free_model_name;
+ firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+ if (!firmw_ver)
+ goto free_manuf_name;
+ printk(KERN_INFO "GDROM: %s from %s with firmware %s\n", model_name, manuf_name, firmw_ver);
+ err = 0;
+ kfree(firmw_ver);
+free_manuf_name:
+ kfree(manuf_name);
+free_model_name:
+ kfree(model_name);
+free_id:
+ kfree(id);
+ return err;
+}
+
+/* set the default mode for DMA transfer */
+static void __devinit gdrom_init_dma_mode(void)
+{
+ ctrl_outb(0x13, GDROM_ERROR_REG);
+ ctrl_outb(0x22, GDROM_INTSEC_REG);
+ gdrom_wait_clrbusy();
+ ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+ gdrom_wait_busy_sleeps();
+ ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); /* memory setting */
+ ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+ gd.cd_info->ops = &gdrom_ops;
+ gd.cd_info->capacity = 1;
+ strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+ gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+ gd.disk->major = gdrom_major;
+ gd.disk->first_minor = 1;
+ gd.disk->minors = 1;
+ strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static void __devinit probe_gdrom_setupqueue(void)
+{
+ blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+ /* using DMA so memory will need to be contiguous */
+ blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+ /* set a large max size to get most from DMA */
+ blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+ gd.disk->queue = gd.gdrom_rq;
+ gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+ int err;
+ if (gdrom_execute_diagnostic() != 1) {
+ printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+ return -ENODEV;
+ }
+ if (gdrom_outputversion())
+ return -ENOMEM;
+ gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+ if (gdrom_major <= 0)
+ return gdrom_major;
+ printk(KERN_INFO "GDROM: Block device is registered with major number %d\n", gdrom_major);
+ gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+ if (!gd.cd_info) {
+ err = -ENOMEM;
+ goto probe_fail_no_mem;
+ }
+ probe_gdrom_setupcd();
+ gd.disk = alloc_disk(1);
+ if (!gd.disk) {
+ err = -ENODEV;
+ goto probe_fail_no_disk;
+ }
+ probe_gdrom_setupdisk();
+ if (register_cdrom(gd.cd_info)) {
+ err = -ENODEV;
+ goto probe_fail_cdrom_register;
+ }
+ gd.disk->fops = &gdrom_bdops;
+ /* latch on to the interrupt */
+ err = gdrom_set_interrupt_handlers();
+ if (err)
+ goto probe_fail_cmdirq_register;
+ gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+ if (!gd.gdrom_rq)
+ goto probe_fail_requestq;
+ probe_gdrom_setupqueue();
+ gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+ if (!gd.toc)
+ goto probe_fail_toc;
+ add_disk(gd.disk);
+ return 0;
+
+probe_fail_toc:
+ blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+ del_gendisk(gd.disk);
+probe_fail_no_disk:
+ kfree(gd.cd_info);
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ gdrom_major = 0;
+probe_fail_no_mem:
+ printk(KERN_WARNING "GDROM: Could not probe for device - error is 0x%X\n", err);
+ return err;
+}
+
+static int remove_gdrom(struct platform_device *devptr)
+{
+ blk_cleanup_queue(gd.gdrom_rq);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ del_gendisk(gd.disk);
+ if (gdrom_major)
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+ .probe = probe_gdrom,
+ .remove = remove_gdrom,
+ .driver = {
+ .name = GDROM_DEV_NAME,
+ },
+};
+
+static int __init init_gdrom(void)
+{
+ int rc;
+ gd.toc = NULL;
+ rc = platform_driver_register(&gdrom_driver);
+ if (rc)
+ return rc;
+ pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+ if (IS_ERR(pd)) {
+ platform_driver_unregister(&gdrom_driver);
+ return PTR_ERR(pd);
+ }
+ return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+ platform_device_unregister(pd);
+ platform_driver_unregister(&gdrom_driver);
+ kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");
diff -rupN linux-2.6/drivers/cdrom/Makefile linux-2.6-new/drivers/cdrom/Makefile
--- linux-2.6/drivers/cdrom/Makefile 2008-01-10 22:25:43.000000000 +0000
+++ linux-2.6-new/drivers/cdrom/Makefile 2008-01-10 23:05:11.000000000 +0000
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
+obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
On Thu, 2008-01-10 at 23:25 +0000, Adrian McMenamin wrote:
> From: Adrian McMenamin <[email protected]>
>
> This patch adds support for the GD-Rom drive, SEGA's proprietary implementation of an IDE CD Rom for the SEGA Dreamcast. This driver implements Sega's Packet Interface (SPI) - at least partially. It will also read disks in SEGA's propreitary GD format.
>
> Unlike previous drivers (which were never in mainline) this uses DMA and not PIO to read disks. It is a new driver, not a refactoring of old drivers.
>
> Signed-off by: Adrian McMenamin <[email protected]>
>
> (Jens - this awaits your ack before going in Paul's queue for the 2.6.25 window)
>
> --------
>
>
Unfortunately, there was one small mistake (a repeated assignment), in
the patch posted yesterday. Here is a corrected version.
Signed-off by: Adrian McMenamin <[email protected]>
diff -rupN a/drivers/block/Kconfig b/drivers/block/Kconfig
--- a/drivers/block/Kconfig 2008-01-11 21:33:18.000000000 +0000
+++ b/drivers/block/Kconfig 2008-01-11 20:55:40.000000000 +0000
@@ -105,6 +105,17 @@ config PARIDE
"MicroSolutions backpack protocol", "DataStor Commuter protocol"
etc.).
+config GDROM
+ tristate "SEGA Dreamcast GD-ROM drive"
+ depends on SH_DREAMCAST
+ help
+ A standard SEGA Dreamcast comes with a modified CD ROM drive called a
+ "GD-ROM" by SEGA to signify it is capable of reading special disks
+ with up to 1 GB of data. This drive will also read standard CD ROM
+ disks. Select this option to access any disks in your GD ROM drive.
+ Most users will want to say "Y" here.
+ You can also build this as a module which will be called gdrom.ko
+
source "drivers/block/paride/Kconfig"
config BLK_CPQ_DA
diff -rupN a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
--- a/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/cdrom/gdrom.c 2008-01-11 20:55:40.000000000 +0000
@@ -0,0 +1,785 @@
+/* GD ROM driver for the SEGA Dreamcast
+ * copyright Adrian McMenamin, 2007
+ * With thanks to Marcus Comstedt and Nathan Keynes
+ * for work in reversing PIO and DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/mach/sysasic.h>
+
+#define GDROM_DEV_NAME "gdrom"
+#define GD_SESSION_OFFSET 150
+
+/* GD Rom commands */
+#define GDROM_COM_SOFTRESET 0x08
+#define GDROM_COM_EXECDIAG 0x90
+#define GDROM_COM_PACKET 0xA0
+#define GDROM_COM_IDDEV 0xA1
+
+/* GD Rom registers */
+#define GDROM_BASE_REG 0xA05F7000
+#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
+#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
+#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
+#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
+#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
+#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
+#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
+#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
+#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
+#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
+
+#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
+#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
+#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
+#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
+#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
+#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
+#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
+
+#define GDROM_HARD_SECTOR 2048
+#define BLOCK_LAYER_SECTOR 512
+#define GD_TO_BLK 4
+
+static const struct {
+ int sense_key;
+ const char * const text;
+} sense_texts[] = {
+ {NO_SENSE, "OK"},
+ {RECOVERED_ERROR, "Recovered from error"},
+ {NOT_READY, "Device not ready"},
+ {MEDIUM_ERROR, "Disk not ready"},
+ {HARDWARE_ERROR, "Hardware error"},
+ {ILLEGAL_REQUEST, "Command has failed"},
+ {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+ {DATA_PROTECT, "Data protection error"},
+ {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static wait_queue_head_t command_queue;
+static wait_queue_head_t request_queue;
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+ unsigned int entry[99];
+ unsigned int first, last;
+ unsigned int leadout;
+};
+
+static struct gdrom_unit {
+ struct gendisk *disk;
+ struct cdrom_device_info *cd_info;
+ int status;
+ int pending;
+ int transfer;
+ char disk_type;
+ struct gdromtoc *toc;
+ struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+ char mid;
+ char modid;
+ char verid;
+ char padA[13];
+ char mname[16];
+ char modname[16];
+ char firmver[16];
+ char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static void gdrom_wait_clrbusy(void)
+{
+ /* long timeouts - typical for a CD Rom */
+ unsigned long timeout = jiffies + HZ * 60;
+ while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && (time_before(jiffies, timeout)))
+ cpu_relax();
+}
+
+static void gdrom_wait_busy_sleeps(void)
+{
+ unsigned long timeout;
+ /* Wait to get busy first */
+ timeout = jiffies + HZ * 60;
+ while (!gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ /* Now wait for busy to clear */
+ gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+ int c;
+ short *data = buf;
+ gdrom_wait_clrbusy();
+ ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+ gdrom_wait_busy_sleeps();
+ /* now read in the data */
+ for (c = 0; c < 40; c++)
+ data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+ short *cmd = spi_string;
+ /* ensure IRQ_WAIT is set */
+ ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+ /* specify how many bytes we expect back */
+ ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+ ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+ /* other parameters */
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_ERROR_REG);
+ /* Wait until we can go */
+ gdrom_wait_clrbusy();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ while (!gdrom_data_request())
+ cpu_relax();
+ outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+ gdrom_hardreset(gd.cd_info);
+ gdrom_wait_clrbusy();
+ ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+ gdrom_wait_busy_sleeps();
+ return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+ struct packet_command *spin_command;
+ spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!spin_command)
+ return -ENOMEM;
+ spin_command->cmd[0] = 0x70;
+ spin_command->cmd[2] = 0x1f;
+ spin_command->buflen = 0;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, spin_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
+ gd.pending = 0;
+ kfree(spin_command);
+ if (gd.status & 0x01) {
+ /* log an error */
+ gdrom_getsense(NULL);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8 ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+ int tocsize;
+ struct packet_command *toc_command;
+ toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!toc_command)
+ return -ENOMEM;
+ tocsize = sizeof(struct gdromtoc);
+ toc_command->cmd[0] = 0x14;
+ toc_command->cmd[1] = session;
+ toc_command->cmd[3] = tocsize >> 8;
+ toc_command->cmd[4] = tocsize & 0xff;
+ toc_command->buflen = tocsize;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, toc_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
+ gd.pending = 0;
+ insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+ kfree(toc_command);
+ if (gd.status & 0x01)
+ return -EINVAL;
+ return 0;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+ return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+ return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+ return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info, struct cdrom_multisession *ms_info)
+{
+ int fentry, lentry, track, data, tocuse, err;
+ if (!gd.toc)
+ return -ENOMEM;
+ tocuse = 1;
+ /* Check if GD-ROM */
+ err = gdrom_readtoc_cmd(gd.toc, 1);
+ /* Not a GD-ROM so check if standard CD-ROM */
+ if (err) {
+ tocuse = 0;
+ err = gdrom_readtoc_cmd(gd.toc, 0);
+ if (err) {
+ printk(KERN_INFO "GDROM: Could not get CD table of contents\n");
+ return -ENXIO;
+ }
+ }
+
+ fentry = get_entry_track(gd.toc->first);
+ lentry = get_entry_track(gd.toc->last);
+ /* Find the first data track */
+ track = get_entry_track(gd.toc->last);
+ do {
+ data = gd.toc->entry[track - 1];
+ if (get_entry_q_ctrl(data))
+ break; /* ie a real data track */
+ track--;
+ } while (track >= fentry);
+
+ if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+ gdrom_getsense(NULL);
+ printk(KERN_INFO "GDROM: No data on the last session of the CD\n");
+ return -ENXIO;
+ }
+
+ ms_info->addr_format = CDROM_LBA;
+ ms_info->addr.lba = get_entry_lba(data);
+ ms_info->xa_flag = 1;
+ return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+ /* spin up the disk */
+ return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* read the sense key */
+ char sense = ctrl_inb(GDROM_ERROR_REG);
+ sense &= 0xF0;
+ if (sense == 0)
+ return CDS_DISC_OK;
+ if (sense == 0x20)
+ return CDS_DRIVE_NOT_READY;
+ /* default */
+ return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* check the sense key */
+ return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+ int count;
+ ctrl_outl(0x1fffff, GDROM_RESET_REG);
+ for (count = 0xa0000000; count < 0xa0200000; count += 4)
+ ctrl_inl(count);
+ return 0;
+}
+
+/* keep the function looking like the universal CD Rom specification - returning int*/
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command)
+{
+ gdrom_spicommand(&command->cmd, command->buflen);
+ return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+ struct packet_command *sense_command;
+ short sense[5];
+ int sense_key;
+ if (gd.pending)
+ return -EIO;
+
+ /* allocate command and buffer */
+ sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!sense_command)
+ return -ENOMEM;
+
+ sense_command->cmd[0] = 0x13;
+ sense_command->cmd[4] = 10;
+ sense_command->buflen = 10;
+
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, sense_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
+ gd.pending = 0;
+ kfree(sense_command);
+ insw(PHYSADDR(GDROM_DATA_REG), &sense, 5);
+ if (sense[1] & 40) {
+ printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+ return -EIO;
+ }
+ sense_key = sense[1] & 0x0F;
+ if (sense_key < ARRAY_SIZE(sense_texts))
+ printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+ else
+ printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+
+ if (bufstring) /* return additional sense data */
+ memcpy(bufstring, &sense[4], 2); /* return additional sense data */
+
+ if (sense_key < 2)
+ return 0;
+ return -EIO;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+ .open = gdrom_open,
+ .release = gdrom_release,
+ .drive_status = gdrom_drivestatus,
+ .media_changed = gdrom_mediachanged,
+ .get_last_session = gdrom_get_last_session,
+ .reset = gdrom_hardreset,
+ .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+ CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+ .n_minors = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+ return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+ return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+ return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file, unsigned cmd, unsigned long arg)
+{
+ return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+ .owner = THIS_MODULE,
+ .open = gdrom_bdops_open,
+ .release = gdrom_bdops_release,
+ .media_changed = gdrom_bdops_mediachanged,
+ .ioctl = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.pending != 1)
+ return IRQ_HANDLED;
+ gd.pending = 0;
+ wake_up_interruptible(&command_queue);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.transfer != 1)
+ return IRQ_HANDLED;
+ gd.transfer = 0;
+ wake_up_interruptible(&request_queue);
+ return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+ int err;
+ init_waitqueue_head(&command_queue);
+ err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, IRQF_DISABLED, "gdrom_command", &gd);
+ if (err)
+ return err;
+ init_waitqueue_head(&request_queue);
+ err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, IRQF_DISABLED, "gdrom_dma", &gd);
+ if (err)
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+ int err, block, block_cnt;
+ struct packet_command *read_command;
+ struct list_head *elem, *next;
+ struct request *req;
+ unsigned long timeout;
+ if (list_empty(&gdrom_deferred))
+ return;
+ read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!read_command)
+ return; /* get more memory later? */
+ read_command->cmd[0] = 0x30;
+ read_command->cmd[1] = 0x20;
+ spin_lock(&gdrom_lock);
+ list_for_each_safe(elem, next, &gdrom_deferred) {
+ req = list_entry(elem, struct request, queuelist);
+ spin_unlock(&gdrom_lock);
+ block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = req->nr_sectors/GD_TO_BLK;
+ ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+ ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+ ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+ ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+ read_command->cmd[2] = (block >> 16) & 0xFF;
+ read_command->cmd[3] = (block >> 8) & 0xFF;
+ read_command->cmd[4] = block & 0xFF;
+ read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+ read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+ read_command->cmd[10] = block_cnt & 0xFF;
+ /* set for DMA */
+ ctrl_outb(1, GDROM_ERROR_REG);
+ /* other registers */
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_BCL_REG);
+ ctrl_outb(0, GDROM_BCH_REG);
+ ctrl_outb(0, GDROM_DSEL_REG);
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ /* In multiple DMA transfers need to wait */
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ gd.pending = 1;
+ gd.transfer = 1;
+ outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+ timeout = jiffies + HZ / 2;
+ while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+ time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(1, GDROM_DMA_STATUS_REG);
+ /* 5 second error margin here seems more reasonable */
+ wait_event_interruptible_timeout(request_queue, gd.transfer == 0, HZ * 5);
+ err = gd.transfer;
+ gd.transfer = 0;
+ gd.pending = 0;
+ /* now seek to take the request spinlock
+ * before handling ending the request */
+ spin_lock(&gdrom_lock);
+ list_del_init(&req->queuelist);
+ end_dequeued_request(req, 1 - err);
+ }
+ spin_unlock(&gdrom_lock);
+ kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+ /* dequeue, add to list of deferred work
+ * and then schedule workqueue */
+ blkdev_dequeue_request(req);
+ list_add_tail(&req->queuelist, &gdrom_deferred);
+ schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+ struct request *req;
+ while ((req = elv_next_request(rq)) != NULL) {
+ if (!blk_fs_request(req)) {
+ printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+ end_request(req, 0);
+ }
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_NOTICE "GDROM: Read only device - write request ignored\n");
+ end_request(req, 0);
+ }
+ if (req->nr_sectors)
+ gdrom_request_handler_dma(req);
+ else
+ end_request(req, 0);
+ }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+ struct gdrom_id *id;
+ char *model_name, *manuf_name, *firmw_ver;
+ int err = -ENOMEM;
+ /* query device ID */
+ id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+ if (!id)
+ return err;
+ gdrom_identifydevice(id);
+ model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+ if (!model_name)
+ goto free_id;
+ manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+ if (!manuf_name)
+ goto free_model_name;
+ firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+ if (!firmw_ver)
+ goto free_manuf_name;
+ printk(KERN_INFO "GDROM: %s from %s with firmware %s\n", model_name, manuf_name, firmw_ver);
+ err = 0;
+ kfree(firmw_ver);
+free_manuf_name:
+ kfree(manuf_name);
+free_model_name:
+ kfree(model_name);
+free_id:
+ kfree(id);
+ return err;
+}
+
+/* set the default mode for DMA transfer */
+static void __devinit gdrom_init_dma_mode(void)
+{
+ ctrl_outb(0x13, GDROM_ERROR_REG);
+ ctrl_outb(0x22, GDROM_INTSEC_REG);
+ gdrom_wait_clrbusy();
+ ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+ gdrom_wait_busy_sleeps();
+ ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG); /* memory setting */
+ ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+ gd.cd_info->ops = &gdrom_ops;
+ gd.cd_info->capacity = 1;
+ strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+ gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+ gd.disk->major = gdrom_major;
+ gd.disk->first_minor = 1;
+ gd.disk->minors = 1;
+ strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static void __devinit probe_gdrom_setupqueue(void)
+{
+ blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+ /* using DMA so memory will need to be contiguous */
+ blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+ /* set a large max size to get most from DMA */
+ blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+ gd.disk->queue = gd.gdrom_rq;
+ gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+ int err;
+ if (gdrom_execute_diagnostic() != 1) {
+ printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+ return -ENODEV;
+ }
+ if (gdrom_outputversion())
+ return -ENOMEM;
+ gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+ if (gdrom_major <= 0)
+ return gdrom_major;
+ printk(KERN_INFO "GDROM: Block device is registered with major number %d\n", gdrom_major);
+ gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+ if (!gd.cd_info) {
+ err = -ENOMEM;
+ goto probe_fail_no_mem;
+ }
+ probe_gdrom_setupcd();
+ gd.disk = alloc_disk(1);
+ if (!gd.disk) {
+ err = -ENODEV;
+ goto probe_fail_no_disk;
+ }
+ probe_gdrom_setupdisk();
+ if (register_cdrom(gd.cd_info)) {
+ err = -ENODEV;
+ goto probe_fail_cdrom_register;
+ }
+ gd.disk->fops = &gdrom_bdops;
+ /* latch on to the interrupt */
+ err = gdrom_set_interrupt_handlers();
+ if (err)
+ goto probe_fail_cmdirq_register;
+ gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+ if (!gd.gdrom_rq)
+ goto probe_fail_requestq;
+ probe_gdrom_setupqueue();
+ gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+ if (!gd.toc)
+ goto probe_fail_toc;
+ add_disk(gd.disk);
+ return 0;
+
+probe_fail_toc:
+ blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+ del_gendisk(gd.disk);
+probe_fail_no_disk:
+ kfree(gd.cd_info);
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ gdrom_major = 0;
+probe_fail_no_mem:
+ printk(KERN_WARNING "GDROM: Could not probe for device - error is 0x%X\n", err);
+ return err;
+}
+
+static int remove_gdrom(struct platform_device *devptr)
+{
+ blk_cleanup_queue(gd.gdrom_rq);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ del_gendisk(gd.disk);
+ if (gdrom_major)
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+ .probe = probe_gdrom,
+ .remove = remove_gdrom,
+ .driver = {
+ .name = GDROM_DEV_NAME,
+ },
+};
+
+static int __init init_gdrom(void)
+{
+ int rc;
+ gd.toc = NULL;
+ rc = platform_driver_register(&gdrom_driver);
+ if (rc)
+ return rc;
+ pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+ if (IS_ERR(pd)) {
+ platform_driver_unregister(&gdrom_driver);
+ return PTR_ERR(pd);
+ }
+ return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+ platform_device_unregister(pd);
+ platform_driver_unregister(&gdrom_driver);
+ kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");
diff -rupN a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile
--- a/drivers/cdrom/Makefile 2008-01-11 21:33:18.000000000 +0000
+++ b/drivers/cdrom/Makefile 2008-01-11 20:55:40.000000000 +0000
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
+obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
On Fri, Jan 11 2008, Adrian McMenamin wrote:
>
> On Thu, 2008-01-10 at 23:25 +0000, Adrian McMenamin wrote:
> > From: Adrian McMenamin <[email protected]>
> >
> > This patch adds support for the GD-Rom drive, SEGA's proprietary implementation of an IDE CD Rom for the SEGA Dreamcast. This driver implements Sega's Packet Interface (SPI) - at least partially. It will also read disks in SEGA's propreitary GD format.
> >
> > Unlike previous drivers (which were never in mainline) this uses DMA and not PIO to read disks. It is a new driver, not a refactoring of old drivers.
> >
> > Signed-off by: Adrian McMenamin <[email protected]>
> >
> > (Jens - this awaits your ack before going in Paul's queue for the 2.6.25 window)
> >
> > --------
> >
> >
>
> Unfortunately, there was one small mistake (a repeated assignment), in
> the patch posted yesterday. Here is a corrected version.
>
> Signed-off by: Adrian McMenamin <[email protected]>
The io handling looks ok to me now.
Acked-by: Jens Axboe <[email protected]>
--
Jens Axboe
On Fri, 11 Jan 2008 21:56:49 +0000 Adrian McMenamin <[email protected]> wrote:
>
> On Thu, 2008-01-10 at 23:25 +0000, Adrian McMenamin wrote:
> > From: Adrian McMenamin <[email protected]>
> >
> > This patch adds support for the GD-Rom drive, SEGA's proprietary implementation of an IDE CD Rom for the SEGA Dreamcast. This driver implements Sega's Packet Interface (SPI) - at least partially. It will also read disks in SEGA's propreitary GD format.
> >
> > Unlike previous drivers (which were never in mainline) this uses DMA and not PIO to read disks. It is a new driver, not a refactoring of old drivers.
> >
>
> ...
>
> +
> +static bool gdrom_is_busy(void)
> +{
> + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
> +}
> +
> +static bool gdrom_data_request(void)
> +{
> + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
> +}
> +
> +static void gdrom_wait_clrbusy(void)
> +{
> + /* long timeouts - typical for a CD Rom */
> + unsigned long timeout = jiffies + HZ * 60;
> + while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && (time_before(jiffies, timeout)))
> + cpu_relax();
> +}
That's a heck of a long busywait, and no indication is made to either the
calling function or to the system operator that this funtction timed out.
> +static void gdrom_wait_busy_sleeps(void)
> +{
> + unsigned long timeout;
> + /* Wait to get busy first */
> + timeout = jiffies + HZ * 60;
> + while (!gdrom_is_busy() && time_before(jiffies, timeout))
> + cpu_relax();
> + /* Now wait for busy to clear */
> + gdrom_wait_clrbusy();
> +}
Ditto * 2.
> +static void gdrom_identifydevice(void *buf)
> +{
> + int c;
> + short *data = buf;
> + gdrom_wait_clrbusy();
> + ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
> + gdrom_wait_busy_sleeps();
> + /* now read in the data */
> + for (c = 0; c < 40; c++)
> + data[c] = ctrl_inw(GDROM_DATA_REG);
> +}
Most kernel code puts a blank line after the definition of the locals and
before start-of-code. We don't make a big fuss over code which omits the
blanks line but please consider.
> +static void gdrom_spicommand(void *spi_string, int buflen)
> +{
> + short *cmd = spi_string;
> + /* ensure IRQ_WAIT is set */
> + ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
> + /* specify how many bytes we expect back */
> + ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
> + ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
> + /* other parameters */
> + ctrl_outb(0, GDROM_INTSEC_REG);
> + ctrl_outb(0, GDROM_SECNUM_REG);
> + ctrl_outb(0, GDROM_ERROR_REG);
> + /* Wait until we can go */
> + gdrom_wait_clrbusy();
> + ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
> + while (!gdrom_data_request())
> + cpu_relax();
No timeout at all here?
> + outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
> +}
> +
> +/* gdrom_command_executediagnostic:
> + * Used to probe for presence of working GDROM
> + * Restarts GDROM device and then applies standard ATA 3
> + * Execute Diagnostic Command: a return of '1' indicates device 0
> + * present and device 1 absent
> + */
> +static char gdrom_execute_diagnostic(void)
> +{
> + gdrom_hardreset(gd.cd_info);
> + gdrom_wait_clrbusy();
> + ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
> + gdrom_wait_busy_sleeps();
> + return ctrl_inb(GDROM_ERROR_REG);
> +}
So this function can busywait for three minutes.
> +/*
> + * Prepare disk command
> + * byte 0 = 0x70
> + * byte 1 = 0x1f
> + */
> +static int gdrom_preparedisk_cmd(void)
> +{
> + struct packet_command *spin_command;
> + spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
> + if (!spin_command)
> + return -ENOMEM;
> + spin_command->cmd[0] = 0x70;
> + spin_command->cmd[2] = 0x1f;
> + spin_command->buflen = 0;
> + gd.pending = 1;
> + gdrom_packetcommand(gd.cd_info, spin_command);
> + /* 60 second timeout */
> + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> + gd.pending = 0;
> + kfree(spin_command);
> + if (gd.status & 0x01) {
> + /* log an error */
> + gdrom_getsense(NULL);
> + return -EIO;
> + }
> + return 0;
> +}
If the wait_event_interruptible_timeout() indeed times out, we go ahead and
free spin_command. But someone else could potentially be using it.
Suppose gdrom_packetcommand() got stuck for a minute due to bad hardware,
or some SCHED_FIFO task preempting us here and running for 61 seconds without
yielding or something similarly weird.
> +/*
> + * Read TOC command
> + * byte 0 = 0x14
> + * byte 1 = session
> + * byte 3 = sizeof TOC >> 8 ie upper byte
> + * byte 4 = sizeof TOC & 0xff ie lower byte
> + */
> +static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
> +{
> + int tocsize;
> + struct packet_command *toc_command;
> + toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
> + if (!toc_command)
> + return -ENOMEM;
> + tocsize = sizeof(struct gdromtoc);
> + toc_command->cmd[0] = 0x14;
> + toc_command->cmd[1] = session;
> + toc_command->cmd[3] = tocsize >> 8;
> + toc_command->cmd[4] = tocsize & 0xff;
> + toc_command->buflen = tocsize;
> + gd.pending = 1;
> + gdrom_packetcommand(gd.cd_info, toc_command);
> + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> + gd.pending = 0;
> + insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
> + kfree(toc_command);
> + if (gd.status & 0x01)
> + return -EINVAL;
> + return 0;
> +}
Ditto.
>
> ...
>
> +/* keep the function looking like the universal CD Rom specification - returning int*/
> +static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command)
> +{
> + gdrom_spicommand(&command->cmd, command->buflen);
> + return 0;
> +}
Please pass the diff through scripts/checkpatch.pl. Some things, like the
above, you may choose to fix. Some you definitely will.
> +/* Get Sense SPI command
> + * From Marcus Comstedt
> + * cmd = 0x13
> + * cmd + 4 = length of returned buffer
> + * Returns 5 16 bit words
> + */
> +static int gdrom_getsense(short *bufstring)
> +{
> + struct packet_command *sense_command;
> + short sense[5];
> + int sense_key;
> + if (gd.pending)
> + return -EIO;
> +
> + /* allocate command and buffer */
> + sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
> + if (!sense_command)
> + return -ENOMEM;
> +
> + sense_command->cmd[0] = 0x13;
> + sense_command->cmd[4] = 10;
> + sense_command->buflen = 10;
> +
> + gd.pending = 1;
> + gdrom_packetcommand(gd.cd_info, sense_command);
> + /* 60 second timeout */
> + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> + gd.pending = 0;
> + kfree(sense_command);
The other thing about wait_event_interruptible_timeout() is that it is,
err, interruptible. If this task has signal_pending() then
wait_event_interruptible_timeout() will return immediately. Surely then
there is a high risk that we'll free sense_command while someone else is
playing with it?
> + insw(PHYSADDR(GDROM_DATA_REG), &sense, 5);
> + if (sense[1] & 40) {
> + printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
> + return -EIO;
> + }
> + sense_key = sense[1] & 0x0F;
> + if (sense_key < ARRAY_SIZE(sense_texts))
> + printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
> + else
> + printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
> +
> + if (bufstring) /* return additional sense data */
> + memcpy(bufstring, &sense[4], 2); /* return additional sense data */
> +
> + if (sense_key < 2)
> + return 0;
> + return -EIO;
> +}
> +
>
> ...
>
> +
> +static int __devinit gdrom_set_interrupt_handlers(void)
> +{
> + int err;
> + init_waitqueue_head(&command_queue);
> + err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, IRQF_DISABLED, "gdrom_command", &gd);
> + if (err)
> + return err;
> + init_waitqueue_head(&request_queue);
You can initialise command_queue and request_queue at compile-time with
DECLARE_WAIT_QUEUE_HEAD().
> + err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, IRQF_DISABLED, "gdrom_dma", &gd);
> + if (err)
> + free_irq(HW_EVENT_GDROM_CMD, &gd);
> + return err;
> +}
> +
>
> ...
>
> + spin_lock(&gdrom_lock);
> + list_for_each_safe(elem, next, &gdrom_deferred) {
> + req = list_entry(elem, struct request, queuelist);
> + spin_unlock(&gdrom_lock);
> + block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
> + block_cnt = req->nr_sectors/GD_TO_BLK;
> + ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
> + ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
> + ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
> + ctrl_outl(1, GDROM_DMA_ENABLE_REG);
> + read_command->cmd[2] = (block >> 16) & 0xFF;
> + read_command->cmd[3] = (block >> 8) & 0xFF;
> + read_command->cmd[4] = block & 0xFF;
> + read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
> + read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
> + read_command->cmd[10] = block_cnt & 0xFF;
> + /* set for DMA */
> + ctrl_outb(1, GDROM_ERROR_REG);
> + /* other registers */
> + ctrl_outb(0, GDROM_SECNUM_REG);
> + ctrl_outb(0, GDROM_BCL_REG);
> + ctrl_outb(0, GDROM_BCH_REG);
> + ctrl_outb(0, GDROM_DSEL_REG);
> + ctrl_outb(0, GDROM_INTSEC_REG);
> + /* In multiple DMA transfers need to wait */
> + timeout = jiffies + HZ / 2;
> + while (gdrom_is_busy() && time_before(jiffies, timeout))
> + cpu_relax();
> + ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
> + timeout = jiffies + HZ / 2;
> + while (gdrom_is_busy() && time_before(jiffies, timeout))
> + cpu_relax();
> + gd.pending = 1;
> + gd.transfer = 1;
> + outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
> + timeout = jiffies + HZ / 2;
> + while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
> + time_before(jiffies, timeout))
> + cpu_relax();
Are all these busy waits really unavoidable?
> + ctrl_outb(1, GDROM_DMA_STATUS_REG);
> + /* 5 second error margin here seems more reasonable */
> + wait_event_interruptible_timeout(request_queue, gd.transfer == 0, HZ * 5);
> + err = gd.transfer;
> + gd.transfer = 0;
> + gd.pending = 0;
> + /* now seek to take the request spinlock
> + * before handling ending the request */
> + spin_lock(&gdrom_lock);
> + list_del_init(&req->queuelist);
> + end_dequeued_request(req, 1 - err);
> + }
> + spin_unlock(&gdrom_lock);
> + kfree(read_command);
> +}
> +
> +static void gdrom_request_handler_dma(struct request *req)
> +{
> + /* dequeue, add to list of deferred work
> + * and then schedule workqueue */
> + blkdev_dequeue_request(req);
> + list_add_tail(&req->queuelist, &gdrom_deferred);
> + schedule_work(&work);
> +}
Whenever a driver does schedule_work() we'd expect to see a
flush_workqeue() somewhere in its cleanup code. Are you sure that there is
no possibility that this work item is still pending (or running) after
device close, during suspend, after rmmod, etc?
On Sat, 2008-01-12 at 05:36 -0800, Andrew Morton wrote:
> On Fri, 11 Jan 2008 21:56:49 +0000 Adrian McMenamin <[email protected]> wrote:
>
> >
> > On Thu, 2008-01-10 at 23:25 +0000, Adrian McMenamin wrote:
> > > From: Adrian McMenamin <[email protected]>
> > >
> > > This patch adds support for the GD-Rom drive, SEGA's proprietary implementation of an IDE CD Rom for the SEGA Dreamcast. This driver implements Sega's Packet Interface (SPI) - at least partially. It will also read disks in SEGA's propreitary GD format.
> > >
> > > Unlike previous drivers (which were never in mainline) this uses DMA and not PIO to read disks. It is a new driver, not a refactoring of old drivers.
> > >
> >
> > ...
> >
> > +
> > +static bool gdrom_is_busy(void)
> > +{
> > + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
> > +}
> > +
> > +static bool gdrom_data_request(void)
> > +{
> > + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
> > +}
> > +
> > +static void gdrom_wait_clrbusy(void)
> > +{
> > + /* long timeouts - typical for a CD Rom */
> > + unsigned long timeout = jiffies + HZ * 60;
> > + while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) && (time_before(jiffies, timeout)))
> > + cpu_relax();
> > +}
>
> That's a heck of a long busywait, and no indication is made to either the
> calling function or to the system operator that this funtction timed out.
>
There is a 60 second timeout on one of the basic read fuctions in
cdrom.c, which I think is where I got this from. But the default timeout
there is 7 seconds, which I suppose I could use.
> > +static void gdrom_wait_busy_sleeps(void)
> > +{
> > + unsigned long timeout;
> > + /* Wait to get busy first */
> > + timeout = jiffies + HZ * 60;
> > + while (!gdrom_is_busy() && time_before(jiffies, timeout))
> > + cpu_relax();
> > + /* Now wait for busy to clear */
> > + gdrom_wait_clrbusy();
> > +}
>
> Ditto * 2.
>
> > +static void gdrom_identifydevice(void *buf)
> > +{
> > + int c;
> > + short *data = buf;
> > + gdrom_wait_clrbusy();
> > + ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
> > + gdrom_wait_busy_sleeps();
> > + /* now read in the data */
> > + for (c = 0; c < 40; c++)
> > + data[c] = ctrl_inw(GDROM_DATA_REG);
> > +}
>
> Most kernel code puts a blank line after the definition of the locals and
> before start-of-code. We don't make a big fuss over code which omits the
> blanks line but please consider.
>
> > +static void gdrom_spicommand(void *spi_string, int buflen)
> > +{
> > + short *cmd = spi_string;
> > + /* ensure IRQ_WAIT is set */
> > + ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
> > + /* specify how many bytes we expect back */
> > + ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
> > + ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
> > + /* other parameters */
> > + ctrl_outb(0, GDROM_INTSEC_REG);
> > + ctrl_outb(0, GDROM_SECNUM_REG);
> > + ctrl_outb(0, GDROM_ERROR_REG);
> > + /* Wait until we can go */
> > + gdrom_wait_clrbusy();
> > + ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
> > + while (!gdrom_data_request())
> > + cpu_relax();
>
> No timeout at all here?
True enough. If the bits never cleared that would be broken hardware,
but not a reason not to catch it.
>
> > + outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
> > +}
> > +
....
> > +static int gdrom_preparedisk_cmd(void)
> > +{
> > + struct packet_command *spin_command;
> > + spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
> > + if (!spin_command)
> > + return -ENOMEM;
> > + spin_command->cmd[0] = 0x70;
> > + spin_command->cmd[2] = 0x1f;
> > + spin_command->buflen = 0;
> > + gd.pending = 1;
> > + gdrom_packetcommand(gd.cd_info, spin_command);
> > + /* 60 second timeout */
> > + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> > + gd.pending = 0;
> > + kfree(spin_command);
> > + if (gd.status & 0x01) {
> > + /* log an error */
> > + gdrom_getsense(NULL);
> > + return -EIO;
> > + }
> > + return 0;
> > +}
>
> If the wait_event_interruptible_timeout() indeed times out, we go ahead and
> free spin_command. But someone else could potentially be using it.
>
> Suppose gdrom_packetcommand() got stuck for a minute due to bad hardware,
> or some SCHED_FIFO task preempting us here and running for 61 seconds without
> yielding or something similarly weird.
>
Maybe I am being stupid here, but I don't follow this. They'll get a
non-fatal error, that's all. Who else would be using spin_command? It's
just a series of bytes to plug into the GD Rom registers, that's all.
> > ...
> >
> > +/* keep the function looking like the universal CD Rom specification - returning int*/
> > +static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command)
> > +{
> > + gdrom_spicommand(&command->cmd, command->buflen);
> > + return 0;
> > +}
>
> Please pass the diff through scripts/checkpatch.pl. Some things, like the
> above, you may choose to fix. Some you definitely will.
I did. I'll recheck it though, of course.
>
> > +/* Get Sense SPI command
> > + * From Marcus Comstedt
> > + * cmd = 0x13
> > + * cmd + 4 = length of returned buffer
> > + * Returns 5 16 bit words
> > + */
> > +static int gdrom_getsense(short *bufstring)
> > +{
> > + struct packet_command *sense_command;
> > + short sense[5];
> > + int sense_key;
> > + if (gd.pending)
> > + return -EIO;
> > +
> > + /* allocate command and buffer */
> > + sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
> > + if (!sense_command)
> > + return -ENOMEM;
> > +
> > + sense_command->cmd[0] = 0x13;
> > + sense_command->cmd[4] = 10;
> > + sense_command->buflen = 10;
> > +
> > + gd.pending = 1;
> > + gdrom_packetcommand(gd.cd_info, sense_command);
> > + /* 60 second timeout */
> > + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> > + gd.pending = 0;
> > + kfree(sense_command);
>
> The other thing about wait_event_interruptible_timeout() is that it is,
> err, interruptible. If this task has signal_pending() then
> wait_event_interruptible_timeout() will return immediately. Surely then
> there is a high risk that we'll free sense_command while someone else is
> playing with it?
>
Again, maybe I am missing the point (quite possible), but I don't see
how this is an issue. What is mising is something to check there haven't
been timeouts earlier that mean we'll just be reading garbage out of the
registers, but I don't there is any problem about freeing this piece of
memory.
....
> > +
> > +static int __devinit gdrom_set_interrupt_handlers(void)
> > +{
> > + int err;
> > + init_waitqueue_head(&command_queue);
> > + err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, IRQF_DISABLED, "gdrom_command", &gd);
> > + if (err)
> > + return err;
> > + init_waitqueue_head(&request_queue);
>
> You can initialise command_queue and request_queue at compile-time with
> DECLARE_WAIT_QUEUE_HEAD().
>
Are you saying that is better?
> > + err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt, IRQF_DISABLED, "gdrom_dma", &gd);
> > + if (err)
> > + free_irq(HW_EVENT_GDROM_CMD, &gd);
> > + return err;
> > +}
> > +
> >
> > ...
> >
> > + spin_lock(&gdrom_lock);
> > + list_for_each_safe(elem, next, &gdrom_deferred) {
> > + req = list_entry(elem, struct request, queuelist);
> > + spin_unlock(&gdrom_lock);
> > + block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
> > + block_cnt = req->nr_sectors/GD_TO_BLK;
> > + ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
> > + ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
> > + ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
> > + ctrl_outl(1, GDROM_DMA_ENABLE_REG);
> > + read_command->cmd[2] = (block >> 16) & 0xFF;
> > + read_command->cmd[3] = (block >> 8) & 0xFF;
> > + read_command->cmd[4] = block & 0xFF;
> > + read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
> > + read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
> > + read_command->cmd[10] = block_cnt & 0xFF;
> > + /* set for DMA */
> > + ctrl_outb(1, GDROM_ERROR_REG);
> > + /* other registers */
> > + ctrl_outb(0, GDROM_SECNUM_REG);
> > + ctrl_outb(0, GDROM_BCL_REG);
> > + ctrl_outb(0, GDROM_BCH_REG);
> > + ctrl_outb(0, GDROM_DSEL_REG);
> > + ctrl_outb(0, GDROM_INTSEC_REG);
> > + /* In multiple DMA transfers need to wait */
> > + timeout = jiffies + HZ / 2;
> > + while (gdrom_is_busy() && time_before(jiffies, timeout))
> > + cpu_relax();
> > + ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
> > + timeout = jiffies + HZ / 2;
> > + while (gdrom_is_busy() && time_before(jiffies, timeout))
> > + cpu_relax();
> > + gd.pending = 1;
> > + gd.transfer = 1;
> > + outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
> > + timeout = jiffies + HZ / 2;
> > + while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
> > + time_before(jiffies, timeout))
> > + cpu_relax();
>
> Are all these busy waits really unavoidable?
I'm afraid so.
...
> > +
> > +static void gdrom_request_handler_dma(struct request *req)
> > +{
> > + /* dequeue, add to list of deferred work
> > + * and then schedule workqueue */
> > + blkdev_dequeue_request(req);
> > + list_add_tail(&req->queuelist, &gdrom_deferred);
> > + schedule_work(&work);
> > +}
>
> Whenever a driver does schedule_work() we'd expect to see a
> flush_workqeue() somewhere in its cleanup code. Are you sure that there is
> no possibility that this work item is still pending (or running) after
> device close, during suspend, after rmmod, etc?
>
Good point.
On Sat, 12 Jan 2008 14:14:01 +0000 Adrian McMenamin <[email protected]> wrote:
>
> > > + spin_command->cmd[0] = 0x70;
> > > + spin_command->cmd[2] = 0x1f;
> > > + spin_command->buflen = 0;
> > > + gd.pending = 1;
> > > + gdrom_packetcommand(gd.cd_info, spin_command);
> > > + /* 60 second timeout */
> > > + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> > > + gd.pending = 0;
> > > + kfree(spin_command);
> > > + if (gd.status & 0x01) {
> > > + /* log an error */
> > > + gdrom_getsense(NULL);
> > > + return -EIO;
> > > + }
> > > + return 0;
> > > +}
> >
> > If the wait_event_interruptible_timeout() indeed times out, we go ahead and
> > free spin_command. But someone else could potentially be using it.
> >
> > Suppose gdrom_packetcommand() got stuck for a minute due to bad hardware,
> > or some SCHED_FIFO task preempting us here and running for 61 seconds without
> > yielding or something similarly weird.
> >
>
>
> Maybe I am being stupid here, but I don't follow this. They'll get a
> non-fatal error, that's all. Who else would be using spin_command? It's
> just a series of bytes to plug into the GD Rom registers, that's all.
>
After programming the registers we need to wait for the interrupt to clear
gd.pending, don't we?
<looks>
oh, I see. gd is a global singleton and we only support one command at a
time and one device. hrm.
> > > +
> > > +static int __devinit gdrom_set_interrupt_handlers(void)
> > > +{
> > > + int err;
> > > + init_waitqueue_head(&command_queue);
> > > + err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt, IRQF_DISABLED, "gdrom_command", &gd);
> > > + if (err)
> > > + return err;
> > > + init_waitqueue_head(&request_queue);
> >
> > You can initialise command_queue and request_queue at compile-time with
> > DECLARE_WAIT_QUEUE_HEAD().
> >
>
> Are you saying that is better?
Yup. Less source code, less object code, no startup-ordering issues.
On 12/01/2008, Andrew Morton <[email protected]> wrote:
> On Sat, 12 Jan 2008 14:14:01 +0000 Adrian McMenamin <[email protected]> wrote:
>
> >
> > > > + spin_command->cmd[0] = 0x70;
> > > > + spin_command->cmd[2] = 0x1f;
> > > > + spin_command->buflen = 0;
> > > > + gd.pending = 1;
> > > > + gdrom_packetcommand(gd.cd_info, spin_command);
> > > > + /* 60 second timeout */
> > > > + wait_event_interruptible_timeout(command_queue, gd.pending == 0, HZ * 60);
> > > > + gd.pending = 0;
> > > > + kfree(spin_command);
> > > > + if (gd.status & 0x01) {
> > > > + /* log an error */
> > > > + gdrom_getsense(NULL);
> > > > + return -EIO;
> > > > + }
> > > > + return 0;
> > > > +}
> > >
> > > If the wait_event_interruptible_timeout() indeed times out, we go ahead and
> > > free spin_command. But someone else could potentially be using it.
> > >
> > > Suppose gdrom_packetcommand() got stuck for a minute due to bad hardware,
> > > or some SCHED_FIFO task preempting us here and running for 61 seconds without
> > > yielding or something similarly weird.
> > >
> >
> >
> > Maybe I am being stupid here, but I don't follow this. They'll get a
> > non-fatal error, that's all. Who else would be using spin_command? It's
> > just a series of bytes to plug into the GD Rom registers, that's all.
> >
>
> After programming the registers we need to wait for the interrupt to clear
> gd.pending, don't we?
>
> <looks>
>
> oh, I see. gd is a global singleton and we only support one command at a
> time and one device. hrm.
>
OK, at the risk of looking like a fool:
Yes, it does treat this as only one device per box as that's the way
the things are made.
The hardware will stop you from running two commands in parallel - the
device will be flagged as busy and so you won't be able to get it do
anything sensible. I have now added in some additional checks so that
a user cannot start another command before the old one finishes - but
I still don't see what the problem is with freeing the memory.
The variable is a local, and an automatic, not a global or a static,
so I don't see how kfree() could be releasing somebody else's lump of
memory anyway. Or have I missed something obvious?
From: Adrian McMenamin <[email protected]>
This patch adds support for the GD-Rom drive, SEGA's proprietary
implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
implements Sega's Packet Interface (SPI) - at least partially. It will
also read disks in SEGA's propreitary GD format.
Unlike previous drivers (which were never in mainline) this uses DMA and
not PIO to read disks. It is a new driver, not a refactoring of old
drivers.
Hopefully this patch addresses some issues that have been raised by
Andrew. Jens previously ack'ed this, but I've left that off (though the
IO code hasn't really been touched).
Signed-off by: Adrian McMenamin <[email protected]>
(Jens - this awaits your ack before going in Paul's queue for the 2.6.25
window)
--------
diff -rupN a/drivers/block/Kconfig b/drivers/block/Kconfig
--- a/drivers/block/Kconfig 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/block/Kconfig 2008-01-14 22:35:38.000000000 +0000
@@ -105,6 +105,17 @@ config PARIDE
"MicroSolutions backpack protocol", "DataStor Commuter protocol"
etc.).
+config GDROM
+ tristate "SEGA Dreamcast GD-ROM drive"
+ depends on SH_DREAMCAST
+ help
+ A standard SEGA Dreamcast comes with a modified CD ROM drive called a
+ "GD-ROM" by SEGA to signify it is capable of reading special disks
+ with up to 1 GB of data. This drive will also read standard CD ROM
+ disks. Select this option to access any disks in your GD ROM drive.
+ Most users will want to say "Y" here.
+ You can also build this as a module which will be called gdrom.ko
+
source "drivers/block/paride/Kconfig"
config BLK_CPQ_DA
diff -rupN a/drivers/block/loop.c b/drivers/block/loop.c
--- a/drivers/block/loop.c 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/block/loop.c 2008-01-14 22:35:38.000000000 +0000
@@ -610,7 +610,7 @@ static int loop_thread(void *data)
static int loop_switch(struct loop_device *lo, struct file *file)
{
struct switch_request w;
- struct bio *bio = bio_alloc(GFP_KERNEL, 1);
+ struct bio *bio = bio_alloc(GFP_KERNEL, 0);
if (!bio)
return -ENOMEM;
init_completion(&w.wait);
diff -rupN a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
--- a/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/cdrom/gdrom.c 2008-01-14 22:35:39.000000000 +0000
@@ -0,0 +1,867 @@
+/* GD ROM driver for the SEGA Dreamcast
+ * copyright Adrian McMenamin, 2007
+ * With thanks to Marcus Comstedt and Nathan Keynes
+ * for work in reversing PIO and DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/mach/sysasic.h>
+
+#define GDROM_DEV_NAME "gdrom"
+#define GD_SESSION_OFFSET 150
+
+/* GD Rom commands */
+#define GDROM_COM_SOFTRESET 0x08
+#define GDROM_COM_EXECDIAG 0x90
+#define GDROM_COM_PACKET 0xA0
+#define GDROM_COM_IDDEV 0xA1
+
+/* GD Rom registers */
+#define GDROM_BASE_REG 0xA05F7000
+#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
+#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
+#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
+#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
+#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
+#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
+#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
+#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
+#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
+#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
+
+#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
+#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
+#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
+#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
+#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
+#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
+#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
+
+#define GDROM_HARD_SECTOR 2048
+#define BLOCK_LAYER_SECTOR 512
+#define GD_TO_BLK 4
+
+#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
+
+static const struct {
+ int sense_key;
+ const char * const text;
+} sense_texts[] = {
+ {NO_SENSE, "OK"},
+ {RECOVERED_ERROR, "Recovered from error"},
+ {NOT_READY, "Device not ready"},
+ {MEDIUM_ERROR, "Disk not ready"},
+ {HARDWARE_ERROR, "Hardware error"},
+ {ILLEGAL_REQUEST, "Command has failed"},
+ {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+ {DATA_PROTECT, "Data protection error"},
+ {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static DECLARE_WAIT_QUEUE_HEAD(command_queue);
+static DECLARE_WAIT_QUEUE_HEAD(request_queue);
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+ unsigned int entry[99];
+ unsigned int first, last;
+ unsigned int leadout;
+};
+
+static struct gdrom_unit {
+ struct gendisk *disk;
+ struct cdrom_device_info *cd_info;
+ int status;
+ int pending;
+ int transfer;
+ char disk_type;
+ struct gdromtoc *toc;
+ struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+ char mid;
+ char modid;
+ char verid;
+ char padA[13];
+ char mname[16];
+ char modname[16];
+ char firmver[16];
+ char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static bool gdrom_wait_clrbusy(void)
+{
+ unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
+ (time_before(jiffies, timeout)))
+ cpu_relax();
+ return time_before(jiffies, timeout + 1);
+}
+
+static bool gdrom_wait_busy_sleeps(void)
+{
+ unsigned long timeout;
+ /* Wait to get busy first */
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while (!gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ /* Now wait for busy to clear */
+ return gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+ int c;
+ short *data = buf;
+ /* If the device won't clear it has probably
+ * been hit by a serious failure - but we'll
+ * try to return a sense key even so */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ /* now read in the data */
+ for (c = 0; c < 40; c++)
+ data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+ short *cmd = spi_string;
+ unsigned long timeout;
+
+ /* ensure IRQ_WAIT is set */
+ ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+ /* specify how many bytes we expect back */
+ ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+ ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+ /* other parameters */
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_ERROR_REG);
+ /* Wait until we can go */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ while (!gdrom_data_request() && time_before(jiffies, timeout))
+ cpu_relax();
+ if (!time_before(jiffies, timeout + 1)) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+ gdrom_hardreset(gd.cd_info);
+ if (!gdrom_wait_clrbusy())
+ return 0;
+ ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return 0;
+ return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+ struct packet_command *spin_command;
+ spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!spin_command)
+ return -ENOMEM;
+ spin_command->cmd[0] = 0x70;
+ spin_command->cmd[2] = 0x1f;
+ spin_command->buflen = 0;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, spin_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ gd.pending = 0;
+ kfree(spin_command);
+ if (gd.status & 0x01) {
+ /* log an error */
+ gdrom_getsense(NULL);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8 ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+ int tocsize;
+ struct packet_command *toc_command;
+ int err = 0;
+
+ toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!toc_command)
+ return -ENOMEM;
+ tocsize = sizeof(struct gdromtoc);
+ toc_command->cmd[0] = 0x14;
+ toc_command->cmd[1] = session;
+ toc_command->cmd[3] = tocsize >> 8;
+ toc_command->cmd[4] = tocsize & 0xff;
+ toc_command->buflen = tocsize;
+ if (gd.pending) {
+ err = -EBUSY;
+ goto cleanup_readtoc_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, toc_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending) {
+ err = -EINVAL;
+ goto cleanup_readtoc;
+ }
+ insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+ if (gd.status & 0x01)
+ err = -EINVAL;
+
+cleanup_readtoc:
+ gd.pending = 0;
+cleanup_readtoc_final:
+ kfree(toc_command);
+ return err;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+ return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+ return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+ return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
+ struct cdrom_multisession *ms_info)
+{
+ int fentry, lentry, track, data, tocuse, err;
+ if (!gd.toc)
+ return -ENOMEM;
+ tocuse = 1;
+ /* Check if GD-ROM */
+ err = gdrom_readtoc_cmd(gd.toc, 1);
+ /* Not a GD-ROM so check if standard CD-ROM */
+ if (err) {
+ tocuse = 0;
+ err = gdrom_readtoc_cmd(gd.toc, 0);
+ if (err) {
+ printk(KERN_INFO "GDROM: Could not get CD "
+ "table of contents\n");
+ return -ENXIO;
+ }
+ }
+
+ fentry = get_entry_track(gd.toc->first);
+ lentry = get_entry_track(gd.toc->last);
+ /* Find the first data track */
+ track = get_entry_track(gd.toc->last);
+ do {
+ data = gd.toc->entry[track - 1];
+ if (get_entry_q_ctrl(data))
+ break; /* ie a real data track */
+ track--;
+ } while (track >= fentry);
+
+ if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+ printk(KERN_INFO "GDROM: No data on the last "
+ "session of the CD\n");
+ gdrom_getsense(NULL);
+ return -ENXIO;
+ }
+
+ ms_info->addr_format = CDROM_LBA;
+ ms_info->addr.lba = get_entry_lba(data);
+ ms_info->xa_flag = 1;
+ return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+ /* spin up the disk */
+ return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* read the sense key */
+ char sense = ctrl_inb(GDROM_ERROR_REG);
+ sense &= 0xF0;
+ if (sense == 0)
+ return CDS_DISC_OK;
+ if (sense == 0x20)
+ return CDS_DRIVE_NOT_READY;
+ /* default */
+ return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* check the sense key */
+ return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+ int count;
+ ctrl_outl(0x1fffff, GDROM_RESET_REG);
+ for (count = 0xa0000000; count < 0xa0200000; count += 4)
+ ctrl_inl(count);
+ return 0;
+}
+
+/* keep the function looking like the universal
+ * CD Rom specification - returning int */
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command)
+{
+ gdrom_spicommand(&command->cmd, command->buflen);
+ return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+ struct packet_command *sense_command;
+ short sense[5];
+ int sense_key;
+ int err = -EIO;
+
+ sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!sense_command)
+ return -ENOMEM;
+ sense_command->cmd[0] = 0x13;
+ sense_command->cmd[4] = 10;
+ sense_command->buflen = 10;
+ /* even if something is pending try to get
+ * the sense key if possible */
+ if (gd.pending && !gdrom_wait_clrbusy()) {
+ err = -EBUSY;
+ goto cleanup_sense_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, sense_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending)
+ goto cleanup_sense;
+ insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
+ if (sense[1] & 40) {
+ printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+ goto cleanup_sense;
+ }
+ sense_key = sense[1] & 0x0F;
+ if (sense_key < ARRAY_SIZE(sense_texts))
+ printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+ else
+ printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+ if (bufstring) /* return addional sense data */
+ memcpy(bufstring, &sense[4], 2);
+ if (sense_key < 2)
+ err = 0;
+
+cleanup_sense:
+ gd.pending = 0;
+cleanup_sense_final:
+ kfree(sense_command);
+ return err;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+ .open = gdrom_open,
+ .release = gdrom_release,
+ .drive_status = gdrom_drivestatus,
+ .media_changed = gdrom_mediachanged,
+ .get_last_session = gdrom_get_last_session,
+ .reset = gdrom_hardreset,
+ .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+ CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+ .n_minors = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+ return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+ return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+ return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
+ unsigned cmd, unsigned long arg)
+{
+ return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+ .owner = THIS_MODULE,
+ .open = gdrom_bdops_open,
+ .release = gdrom_bdops_release,
+ .media_changed = gdrom_bdops_mediachanged,
+ .ioctl = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.pending != 1)
+ return IRQ_HANDLED;
+ gd.pending = 0;
+ wake_up_interruptible(&command_queue);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.transfer != 1)
+ return IRQ_HANDLED;
+ gd.transfer = 0;
+ wake_up_interruptible(&request_queue);
+ return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+ int err;
+
+ err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
+ IRQF_DISABLED, "gdrom_command", &gd);
+ if (err)
+ return err;
+ err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
+ IRQF_DISABLED, "gdrom_dma", &gd);
+ if (err)
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+ int err, block, block_cnt;
+ struct packet_command *read_command;
+ struct list_head *elem, *next;
+ struct request *req;
+ unsigned long timeout;
+
+ if (list_empty(&gdrom_deferred))
+ return;
+ read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!read_command)
+ return; /* get more memory later? */
+ read_command->cmd[0] = 0x30;
+ read_command->cmd[1] = 0x20;
+ spin_lock(&gdrom_lock);
+ list_for_each_safe(elem, next, &gdrom_deferred) {
+ req = list_entry(elem, struct request, queuelist);
+ spin_unlock(&gdrom_lock);
+ block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = req->nr_sectors/GD_TO_BLK;
+ ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+ ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+ ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+ ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+ read_command->cmd[2] = (block >> 16) & 0xFF;
+ read_command->cmd[3] = (block >> 8) & 0xFF;
+ read_command->cmd[4] = block & 0xFF;
+ read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+ read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+ read_command->cmd[10] = block_cnt & 0xFF;
+ /* set for DMA */
+ ctrl_outb(1, GDROM_ERROR_REG);
+ /* other registers */
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_BCL_REG);
+ ctrl_outb(0, GDROM_BCH_REG);
+ ctrl_outb(0, GDROM_DSEL_REG);
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ /* Wait for registers to reset after any previous activity */
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ timeout = jiffies + HZ / 2;
+ /* Wait for packet command to finish */
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ gd.pending = 1;
+ gd.transfer = 1;
+ outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+ timeout = jiffies + HZ / 2;
+ /* Wait for any pending DMA to finish */
+ while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+ time_before(jiffies, timeout))
+ cpu_relax();
+ /* start transfer */
+ ctrl_outb(1, GDROM_DMA_STATUS_REG);
+ wait_event_interruptible_timeout(request_queue,
+ gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
+ err = gd.transfer;
+ gd.transfer = 0;
+ gd.pending = 0;
+ /* now seek to take the request spinlock
+ * before handling ending the request */
+ spin_lock(&gdrom_lock);
+ list_del_init(&req->queuelist);
+ end_dequeued_request(req, 1 - err);
+ }
+ spin_unlock(&gdrom_lock);
+ kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+ /* dequeue, add to list of deferred work
+ * and then schedule workqueue */
+ blkdev_dequeue_request(req);
+ list_add_tail(&req->queuelist, &gdrom_deferred);
+ schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+ struct request *req;
+
+ while ((req = elv_next_request(rq)) != NULL) {
+ if (!blk_fs_request(req)) {
+ printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+ end_request(req, 0);
+ }
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_NOTICE "GDROM: Read only device -");
+ printk(" write request ignored\n");
+ end_request(req, 0);
+ }
+ if (req->nr_sectors)
+ gdrom_request_handler_dma(req);
+ else
+ end_request(req, 0);
+ }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+ struct gdrom_id *id;
+ char *model_name, *manuf_name, *firmw_ver;
+ int err = -ENOMEM;
+
+ /* query device ID */
+ id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+ if (!id)
+ return err;
+ gdrom_identifydevice(id);
+ model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+ if (!model_name)
+ goto free_id;
+ manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+ if (!manuf_name)
+ goto free_model_name;
+ firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+ if (!firmw_ver)
+ goto free_manuf_name;
+ printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
+ model_name, manuf_name, firmw_ver);
+ err = 0;
+ kfree(firmw_ver);
+free_manuf_name:
+ kfree(manuf_name);
+free_model_name:
+ kfree(model_name);
+free_id:
+ kfree(id);
+ return err;
+}
+
+/* set the default mode for DMA transfer */
+static int __devinit gdrom_init_dma_mode(void)
+{
+ ctrl_outb(0x13, GDROM_ERROR_REG);
+ ctrl_outb(0x22, GDROM_INTSEC_REG);
+ if (!gdrom_wait_clrbusy())
+ return -EBUSY;
+ ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return -EBUSY;
+ /* Memory protection setting for GDROM DMA
+ * Bits 31 - 16 security: 0x8843
+ * Bits 15 and 7 reserved (0)
+ * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
+ * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
+ * (0x40 | 0x80) = start range at 0x0C000000
+ * (0x7F | 0x80) = end range at 0x0FFFFFFF */
+ ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
+ ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+ return 0;
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+ gd.cd_info->ops = &gdrom_ops;
+ gd.cd_info->capacity = 1;
+ strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+ gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
+ CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+ gd.disk->major = gdrom_major;
+ gd.disk->first_minor = 1;
+ gd.disk->minors = 1;
+ strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static int __devinit probe_gdrom_setupqueue(void)
+{
+ blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+ /* using DMA so memory will need to be contiguous */
+ blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+ /* set a large max size to get most from DMA */
+ blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+ gd.disk->queue = gd.gdrom_rq;
+ return gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+ int err;
+ /* Start the device */
+ if (gdrom_execute_diagnostic() != 1) {
+ printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+ return -ENODEV;
+ }
+ /* Print out firmware ID */
+ if (gdrom_outputversion())
+ return -ENOMEM;
+ /* Register GDROM */
+ gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+ if (gdrom_major <= 0)
+ return gdrom_major;
+ printk(KERN_INFO "GDROM: Registered with major number %d\n",
+ gdrom_major);
+ /* Specify basic properties of drive */
+ gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+ if (!gd.cd_info) {
+ err = -ENOMEM;
+ goto probe_fail_no_mem;
+ }
+ probe_gdrom_setupcd();
+ gd.disk = alloc_disk(1);
+ if (!gd.disk) {
+ err = -ENODEV;
+ goto probe_fail_no_disk;
+ }
+ probe_gdrom_setupdisk();
+ if (register_cdrom(gd.cd_info)) {
+ err = -ENODEV;
+ goto probe_fail_cdrom_register;
+ }
+ gd.disk->fops = &gdrom_bdops;
+ /* latch on to the interrupt */
+ err = gdrom_set_interrupt_handlers();
+ if (err)
+ goto probe_fail_cmdirq_register;
+ gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+ if (!gd.gdrom_rq)
+ goto probe_fail_requestq;
+
+ err = probe_gdrom_setupqueue();
+ if (err)
+ goto probe_fail_toc;
+
+ gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+ if (!gd.toc)
+ goto probe_fail_toc;
+ add_disk(gd.disk);
+ return 0;
+
+probe_fail_toc:
+ blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+ del_gendisk(gd.disk);
+probe_fail_no_disk:
+ kfree(gd.cd_info);
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ gdrom_major = 0;
+probe_fail_no_mem:
+ printk(KERN_WARNING "GDROM: Could not probe for device - error is 0x%X\n", err);
+ return err;
+}
+
+static int remove_gdrom(struct platform_device *devptr)
+{
+ flush_scheduled_work();
+ blk_cleanup_queue(gd.gdrom_rq);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ del_gendisk(gd.disk);
+ if (gdrom_major)
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+ .probe = probe_gdrom,
+ .remove = remove_gdrom,
+ .driver = {
+ .name = GDROM_DEV_NAME,
+ },
+};
+
+static int __init init_gdrom(void)
+{
+ int rc;
+ gd.toc = NULL;
+ rc = platform_driver_register(&gdrom_driver);
+ if (rc)
+ return rc;
+ pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+ if (IS_ERR(pd)) {
+ platform_driver_unregister(&gdrom_driver);
+ return PTR_ERR(pd);
+ }
+ return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+ platform_device_unregister(pd);
+ platform_driver_unregister(&gdrom_driver);
+ kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");
diff -rupN a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile
--- a/drivers/cdrom/Makefile 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/cdrom/Makefile 2008-01-14 22:35:39.000000000 +0000
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
+obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
On Mon, 2008-01-14 at 23:00 +0000, Adrian McMenamin wrote:
> From: Adrian McMenamin <[email protected]>
>
> This patch adds support for the GD-Rom drive, SEGA's proprietary
> implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
> implements Sega's Packet Interface (SPI) - at least partially. It will
> also read disks in SEGA's propreitary GD format.
>
> Unlike previous drivers (which were never in mainline) this uses DMA and
> not PIO to read disks. It is a new driver, not a refactoring of old
> drivers.
>
> Hopefully this patch addresses some issues that have been raised by
> Andrew. Jens previously ack'ed this, but I've left that off (though the
> IO code hasn't really been touched).
>
> Signed-off by: Adrian McMenamin <[email protected]>
>
> (Jens - this awaits your ack before going in Paul's queue for the 2.6.25
> window)
>
Apologies. Obviously something extraeous from loop.c slipped in the
previous patch - presumably resulting from the differences between the
2.6.25 queue and 2.6.24-rc7.
Here's a corrected version.
diff -rupN a/drivers/block/Kconfig b/drivers/block/Kconfig
--- a/drivers/block/Kconfig 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/block/Kconfig 2008-01-14 22:35:38.000000000 +0000
@@ -105,6 +105,17 @@ config PARIDE
"MicroSolutions backpack protocol", "DataStor Commuter protocol"
etc.).
+config GDROM
+ tristate "SEGA Dreamcast GD-ROM drive"
+ depends on SH_DREAMCAST
+ help
+ A standard SEGA Dreamcast comes with a modified CD ROM drive called a
+ "GD-ROM" by SEGA to signify it is capable of reading special disks
+ with up to 1 GB of data. This drive will also read standard CD ROM
+ disks. Select this option to access any disks in your GD ROM drive.
+ Most users will want to say "Y" here.
+ You can also build this as a module which will be called gdrom.ko
+
source "drivers/block/paride/Kconfig"
config BLK_CPQ_DA
diff -rupN a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
--- a/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/cdrom/gdrom.c 2008-01-14 22:35:39.000000000 +0000
@@ -0,0 +1,867 @@
+/* GD ROM driver for the SEGA Dreamcast
+ * copyright Adrian McMenamin, 2007
+ * With thanks to Marcus Comstedt and Nathan Keynes
+ * for work in reversing PIO and DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/mach/sysasic.h>
+
+#define GDROM_DEV_NAME "gdrom"
+#define GD_SESSION_OFFSET 150
+
+/* GD Rom commands */
+#define GDROM_COM_SOFTRESET 0x08
+#define GDROM_COM_EXECDIAG 0x90
+#define GDROM_COM_PACKET 0xA0
+#define GDROM_COM_IDDEV 0xA1
+
+/* GD Rom registers */
+#define GDROM_BASE_REG 0xA05F7000
+#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
+#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
+#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
+#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
+#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
+#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
+#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
+#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
+#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
+#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
+
+#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
+#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
+#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
+#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
+#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
+#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
+#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
+
+#define GDROM_HARD_SECTOR 2048
+#define BLOCK_LAYER_SECTOR 512
+#define GD_TO_BLK 4
+
+#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
+
+static const struct {
+ int sense_key;
+ const char * const text;
+} sense_texts[] = {
+ {NO_SENSE, "OK"},
+ {RECOVERED_ERROR, "Recovered from error"},
+ {NOT_READY, "Device not ready"},
+ {MEDIUM_ERROR, "Disk not ready"},
+ {HARDWARE_ERROR, "Hardware error"},
+ {ILLEGAL_REQUEST, "Command has failed"},
+ {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+ {DATA_PROTECT, "Data protection error"},
+ {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static DECLARE_WAIT_QUEUE_HEAD(command_queue);
+static DECLARE_WAIT_QUEUE_HEAD(request_queue);
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+ unsigned int entry[99];
+ unsigned int first, last;
+ unsigned int leadout;
+};
+
+static struct gdrom_unit {
+ struct gendisk *disk;
+ struct cdrom_device_info *cd_info;
+ int status;
+ int pending;
+ int transfer;
+ char disk_type;
+ struct gdromtoc *toc;
+ struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+ char mid;
+ char modid;
+ char verid;
+ char padA[13];
+ char mname[16];
+ char modname[16];
+ char firmver[16];
+ char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static bool gdrom_wait_clrbusy(void)
+{
+ unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
+ (time_before(jiffies, timeout)))
+ cpu_relax();
+ return time_before(jiffies, timeout + 1);
+}
+
+static bool gdrom_wait_busy_sleeps(void)
+{
+ unsigned long timeout;
+ /* Wait to get busy first */
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while (!gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ /* Now wait for busy to clear */
+ return gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+ int c;
+ short *data = buf;
+ /* If the device won't clear it has probably
+ * been hit by a serious failure - but we'll
+ * try to return a sense key even so */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ /* now read in the data */
+ for (c = 0; c < 40; c++)
+ data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+ short *cmd = spi_string;
+ unsigned long timeout;
+
+ /* ensure IRQ_WAIT is set */
+ ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+ /* specify how many bytes we expect back */
+ ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+ ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+ /* other parameters */
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_ERROR_REG);
+ /* Wait until we can go */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ while (!gdrom_data_request() && time_before(jiffies, timeout))
+ cpu_relax();
+ if (!time_before(jiffies, timeout + 1)) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+ gdrom_hardreset(gd.cd_info);
+ if (!gdrom_wait_clrbusy())
+ return 0;
+ ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return 0;
+ return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+ struct packet_command *spin_command;
+ spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!spin_command)
+ return -ENOMEM;
+ spin_command->cmd[0] = 0x70;
+ spin_command->cmd[2] = 0x1f;
+ spin_command->buflen = 0;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, spin_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ gd.pending = 0;
+ kfree(spin_command);
+ if (gd.status & 0x01) {
+ /* log an error */
+ gdrom_getsense(NULL);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8 ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+ int tocsize;
+ struct packet_command *toc_command;
+ int err = 0;
+
+ toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!toc_command)
+ return -ENOMEM;
+ tocsize = sizeof(struct gdromtoc);
+ toc_command->cmd[0] = 0x14;
+ toc_command->cmd[1] = session;
+ toc_command->cmd[3] = tocsize >> 8;
+ toc_command->cmd[4] = tocsize & 0xff;
+ toc_command->buflen = tocsize;
+ if (gd.pending) {
+ err = -EBUSY;
+ goto cleanup_readtoc_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, toc_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending) {
+ err = -EINVAL;
+ goto cleanup_readtoc;
+ }
+ insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+ if (gd.status & 0x01)
+ err = -EINVAL;
+
+cleanup_readtoc:
+ gd.pending = 0;
+cleanup_readtoc_final:
+ kfree(toc_command);
+ return err;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+ return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+ return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+ return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
+ struct cdrom_multisession *ms_info)
+{
+ int fentry, lentry, track, data, tocuse, err;
+ if (!gd.toc)
+ return -ENOMEM;
+ tocuse = 1;
+ /* Check if GD-ROM */
+ err = gdrom_readtoc_cmd(gd.toc, 1);
+ /* Not a GD-ROM so check if standard CD-ROM */
+ if (err) {
+ tocuse = 0;
+ err = gdrom_readtoc_cmd(gd.toc, 0);
+ if (err) {
+ printk(KERN_INFO "GDROM: Could not get CD "
+ "table of contents\n");
+ return -ENXIO;
+ }
+ }
+
+ fentry = get_entry_track(gd.toc->first);
+ lentry = get_entry_track(gd.toc->last);
+ /* Find the first data track */
+ track = get_entry_track(gd.toc->last);
+ do {
+ data = gd.toc->entry[track - 1];
+ if (get_entry_q_ctrl(data))
+ break; /* ie a real data track */
+ track--;
+ } while (track >= fentry);
+
+ if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+ printk(KERN_INFO "GDROM: No data on the last "
+ "session of the CD\n");
+ gdrom_getsense(NULL);
+ return -ENXIO;
+ }
+
+ ms_info->addr_format = CDROM_LBA;
+ ms_info->addr.lba = get_entry_lba(data);
+ ms_info->xa_flag = 1;
+ return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+ /* spin up the disk */
+ return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* read the sense key */
+ char sense = ctrl_inb(GDROM_ERROR_REG);
+ sense &= 0xF0;
+ if (sense == 0)
+ return CDS_DISC_OK;
+ if (sense == 0x20)
+ return CDS_DRIVE_NOT_READY;
+ /* default */
+ return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* check the sense key */
+ return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+ int count;
+ ctrl_outl(0x1fffff, GDROM_RESET_REG);
+ for (count = 0xa0000000; count < 0xa0200000; count += 4)
+ ctrl_inl(count);
+ return 0;
+}
+
+/* keep the function looking like the universal
+ * CD Rom specification - returning int */
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command)
+{
+ gdrom_spicommand(&command->cmd, command->buflen);
+ return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+ struct packet_command *sense_command;
+ short sense[5];
+ int sense_key;
+ int err = -EIO;
+
+ sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!sense_command)
+ return -ENOMEM;
+ sense_command->cmd[0] = 0x13;
+ sense_command->cmd[4] = 10;
+ sense_command->buflen = 10;
+ /* even if something is pending try to get
+ * the sense key if possible */
+ if (gd.pending && !gdrom_wait_clrbusy()) {
+ err = -EBUSY;
+ goto cleanup_sense_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, sense_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending)
+ goto cleanup_sense;
+ insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
+ if (sense[1] & 40) {
+ printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+ goto cleanup_sense;
+ }
+ sense_key = sense[1] & 0x0F;
+ if (sense_key < ARRAY_SIZE(sense_texts))
+ printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+ else
+ printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+ if (bufstring) /* return addional sense data */
+ memcpy(bufstring, &sense[4], 2);
+ if (sense_key < 2)
+ err = 0;
+
+cleanup_sense:
+ gd.pending = 0;
+cleanup_sense_final:
+ kfree(sense_command);
+ return err;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+ .open = gdrom_open,
+ .release = gdrom_release,
+ .drive_status = gdrom_drivestatus,
+ .media_changed = gdrom_mediachanged,
+ .get_last_session = gdrom_get_last_session,
+ .reset = gdrom_hardreset,
+ .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+ CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+ .n_minors = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+ return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+ return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+ return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
+ unsigned cmd, unsigned long arg)
+{
+ return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+ .owner = THIS_MODULE,
+ .open = gdrom_bdops_open,
+ .release = gdrom_bdops_release,
+ .media_changed = gdrom_bdops_mediachanged,
+ .ioctl = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.pending != 1)
+ return IRQ_HANDLED;
+ gd.pending = 0;
+ wake_up_interruptible(&command_queue);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.transfer != 1)
+ return IRQ_HANDLED;
+ gd.transfer = 0;
+ wake_up_interruptible(&request_queue);
+ return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+ int err;
+
+ err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
+ IRQF_DISABLED, "gdrom_command", &gd);
+ if (err)
+ return err;
+ err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
+ IRQF_DISABLED, "gdrom_dma", &gd);
+ if (err)
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+ int err, block, block_cnt;
+ struct packet_command *read_command;
+ struct list_head *elem, *next;
+ struct request *req;
+ unsigned long timeout;
+
+ if (list_empty(&gdrom_deferred))
+ return;
+ read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!read_command)
+ return; /* get more memory later? */
+ read_command->cmd[0] = 0x30;
+ read_command->cmd[1] = 0x20;
+ spin_lock(&gdrom_lock);
+ list_for_each_safe(elem, next, &gdrom_deferred) {
+ req = list_entry(elem, struct request, queuelist);
+ spin_unlock(&gdrom_lock);
+ block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = req->nr_sectors/GD_TO_BLK;
+ ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+ ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+ ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+ ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+ read_command->cmd[2] = (block >> 16) & 0xFF;
+ read_command->cmd[3] = (block >> 8) & 0xFF;
+ read_command->cmd[4] = block & 0xFF;
+ read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+ read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+ read_command->cmd[10] = block_cnt & 0xFF;
+ /* set for DMA */
+ ctrl_outb(1, GDROM_ERROR_REG);
+ /* other registers */
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_BCL_REG);
+ ctrl_outb(0, GDROM_BCH_REG);
+ ctrl_outb(0, GDROM_DSEL_REG);
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ /* Wait for registers to reset after any previous activity */
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ timeout = jiffies + HZ / 2;
+ /* Wait for packet command to finish */
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ gd.pending = 1;
+ gd.transfer = 1;
+ outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+ timeout = jiffies + HZ / 2;
+ /* Wait for any pending DMA to finish */
+ while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+ time_before(jiffies, timeout))
+ cpu_relax();
+ /* start transfer */
+ ctrl_outb(1, GDROM_DMA_STATUS_REG);
+ wait_event_interruptible_timeout(request_queue,
+ gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
+ err = gd.transfer;
+ gd.transfer = 0;
+ gd.pending = 0;
+ /* now seek to take the request spinlock
+ * before handling ending the request */
+ spin_lock(&gdrom_lock);
+ list_del_init(&req->queuelist);
+ end_dequeued_request(req, 1 - err);
+ }
+ spin_unlock(&gdrom_lock);
+ kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+ /* dequeue, add to list of deferred work
+ * and then schedule workqueue */
+ blkdev_dequeue_request(req);
+ list_add_tail(&req->queuelist, &gdrom_deferred);
+ schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+ struct request *req;
+
+ while ((req = elv_next_request(rq)) != NULL) {
+ if (!blk_fs_request(req)) {
+ printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+ end_request(req, 0);
+ }
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_NOTICE "GDROM: Read only device -");
+ printk(" write request ignored\n");
+ end_request(req, 0);
+ }
+ if (req->nr_sectors)
+ gdrom_request_handler_dma(req);
+ else
+ end_request(req, 0);
+ }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+ struct gdrom_id *id;
+ char *model_name, *manuf_name, *firmw_ver;
+ int err = -ENOMEM;
+
+ /* query device ID */
+ id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+ if (!id)
+ return err;
+ gdrom_identifydevice(id);
+ model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+ if (!model_name)
+ goto free_id;
+ manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+ if (!manuf_name)
+ goto free_model_name;
+ firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+ if (!firmw_ver)
+ goto free_manuf_name;
+ printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
+ model_name, manuf_name, firmw_ver);
+ err = 0;
+ kfree(firmw_ver);
+free_manuf_name:
+ kfree(manuf_name);
+free_model_name:
+ kfree(model_name);
+free_id:
+ kfree(id);
+ return err;
+}
+
+/* set the default mode for DMA transfer */
+static int __devinit gdrom_init_dma_mode(void)
+{
+ ctrl_outb(0x13, GDROM_ERROR_REG);
+ ctrl_outb(0x22, GDROM_INTSEC_REG);
+ if (!gdrom_wait_clrbusy())
+ return -EBUSY;
+ ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return -EBUSY;
+ /* Memory protection setting for GDROM DMA
+ * Bits 31 - 16 security: 0x8843
+ * Bits 15 and 7 reserved (0)
+ * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
+ * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
+ * (0x40 | 0x80) = start range at 0x0C000000
+ * (0x7F | 0x80) = end range at 0x0FFFFFFF */
+ ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
+ ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+ return 0;
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+ gd.cd_info->ops = &gdrom_ops;
+ gd.cd_info->capacity = 1;
+ strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+ gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
+ CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+ gd.disk->major = gdrom_major;
+ gd.disk->first_minor = 1;
+ gd.disk->minors = 1;
+ strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static int __devinit probe_gdrom_setupqueue(void)
+{
+ blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+ /* using DMA so memory will need to be contiguous */
+ blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+ /* set a large max size to get most from DMA */
+ blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+ gd.disk->queue = gd.gdrom_rq;
+ return gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+ int err;
+ /* Start the device */
+ if (gdrom_execute_diagnostic() != 1) {
+ printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+ return -ENODEV;
+ }
+ /* Print out firmware ID */
+ if (gdrom_outputversion())
+ return -ENOMEM;
+ /* Register GDROM */
+ gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+ if (gdrom_major <= 0)
+ return gdrom_major;
+ printk(KERN_INFO "GDROM: Registered with major number %d\n",
+ gdrom_major);
+ /* Specify basic properties of drive */
+ gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+ if (!gd.cd_info) {
+ err = -ENOMEM;
+ goto probe_fail_no_mem;
+ }
+ probe_gdrom_setupcd();
+ gd.disk = alloc_disk(1);
+ if (!gd.disk) {
+ err = -ENODEV;
+ goto probe_fail_no_disk;
+ }
+ probe_gdrom_setupdisk();
+ if (register_cdrom(gd.cd_info)) {
+ err = -ENODEV;
+ goto probe_fail_cdrom_register;
+ }
+ gd.disk->fops = &gdrom_bdops;
+ /* latch on to the interrupt */
+ err = gdrom_set_interrupt_handlers();
+ if (err)
+ goto probe_fail_cmdirq_register;
+ gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+ if (!gd.gdrom_rq)
+ goto probe_fail_requestq;
+
+ err = probe_gdrom_setupqueue();
+ if (err)
+ goto probe_fail_toc;
+
+ gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+ if (!gd.toc)
+ goto probe_fail_toc;
+ add_disk(gd.disk);
+ return 0;
+
+probe_fail_toc:
+ blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+ del_gendisk(gd.disk);
+probe_fail_no_disk:
+ kfree(gd.cd_info);
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ gdrom_major = 0;
+probe_fail_no_mem:
+ printk(KERN_WARNING "GDROM: Could not probe for device - error is 0x%X\n", err);
+ return err;
+}
+
+static int remove_gdrom(struct platform_device *devptr)
+{
+ flush_scheduled_work();
+ blk_cleanup_queue(gd.gdrom_rq);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ del_gendisk(gd.disk);
+ if (gdrom_major)
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+ .probe = probe_gdrom,
+ .remove = remove_gdrom,
+ .driver = {
+ .name = GDROM_DEV_NAME,
+ },
+};
+
+static int __init init_gdrom(void)
+{
+ int rc;
+ gd.toc = NULL;
+ rc = platform_driver_register(&gdrom_driver);
+ if (rc)
+ return rc;
+ pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+ if (IS_ERR(pd)) {
+ platform_driver_unregister(&gdrom_driver);
+ return PTR_ERR(pd);
+ }
+ return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+ platform_device_unregister(pd);
+ platform_driver_unregister(&gdrom_driver);
+ kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");
diff -rupN a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile
--- a/drivers/cdrom/Makefile 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/cdrom/Makefile 2008-01-14 22:35:39.000000000 +0000
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
+obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
On Mon, Jan 14, 2008 at 11:17:15PM +0000, Adrian McMenamin wrote:
> +/* GD Rom registers */
> +#define GDROM_BASE_REG 0xA05F7000
> +#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
> +#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
> +#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
> +#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
> +#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
> +#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
> +#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
> +#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
> +#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
> +#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
> +
> +#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
> +#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
> +#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
> +#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
> +#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
> +#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
> +#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
> +
Almost all of these are whitespace damaged. checkpatch doesn't seem to
catch them, but that's checkpatch's problem.
If your editor has no way of flagging whitespace damage in a visible
fashion, you may wish to consider replacing it with something that isn't
crap.
With vim you can use something like 'let c_space_errors=1' to see these.
> +static bool gdrom_data_request(void)
> +{
> + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
> +}
> +
Andrew first pointed this out, and this is still broken. Additionally,
checkpatch _does_ complain about this:
ERROR: use tabs not spaces
#202: FILE: drivers/cdrom/gdrom.c:146:
+ ^Ireturn (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;$
ERROR: use tabs not spaces
#230: FILE: drivers/cdrom/gdrom.c:174:
+ ^I * been hit by a serious failure - but we'll$
ERROR: use tabs not spaces
#231: FILE: drivers/cdrom/gdrom.c:175:
+ ^I * try to return a sense key even so */$
ERROR: use tabs not spaces
#497: FILE: drivers/cdrom/gdrom.c:441:
+ ^I * the sense key if possible */$
ERROR: use tabs not spaces
#517: FILE: drivers/cdrom/gdrom.c:461:
+ ^I^Iprintk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);$
ERROR: use tabs not spaces
#680: FILE: drivers/cdrom/gdrom.c:624:
+ ^I^I * before handling ending the request */$
ERROR: use tabs not spaces
#692: FILE: drivers/cdrom/gdrom.c:636:
+ ^I * and then schedule workqueue */$
ERROR: use tabs not spaces
#764: FILE: drivers/cdrom/gdrom.c:708:
+ ^I * Bits 31 - 16 security: 0x8843$
ERROR: use tabs not spaces
#765: FILE: drivers/cdrom/gdrom.c:709:
+ ^I * Bits 15 and 7 reserved (0)$
ERROR: use tabs not spaces
#766: FILE: drivers/cdrom/gdrom.c:710:
+ ^I * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80$
ERROR: trailing whitespace
#767: FILE: drivers/cdrom/gdrom.c:711:
+ ^I * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 $
ERROR: use tabs not spaces
#767: FILE: drivers/cdrom/gdrom.c:711:
+ ^I * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80 $
ERROR: use tabs not spaces
#768: FILE: drivers/cdrom/gdrom.c:712:
+ ^I * (0x40 | 0x80) = start range at 0x0C000000$
ERROR: use tabs not spaces
#769: FILE: drivers/cdrom/gdrom.c:713:
+ ^I * (0x7F | 0x80) = end range at 0x0FFFFFFF */$
WARNING: line over 80 characters
#873: FILE: drivers/cdrom/gdrom.c:817:
+ printk(KERN_WARNING "GDROM: Could not probe for device - error is 0x%X\n", err);
All of these seem to stem from the fact that your editor is misconfigured
or broken. Please fix all of these and resubmit.
> +static int __devinit probe_gdrom(struct platform_device *devptr)
> +{
[snip]
> +}
> +
> +static int remove_gdrom(struct platform_device *devptr)
> +{
> + flush_scheduled_work();
> + blk_cleanup_queue(gd.gdrom_rq);
> + free_irq(HW_EVENT_GDROM_CMD, &gd);
> + free_irq(HW_EVENT_GDROM_DMA, &gd);
> + del_gendisk(gd.disk);
> + if (gdrom_major)
> + unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
> + return unregister_cdrom(gd.cd_info);
> +}
> +
> +static struct platform_driver gdrom_driver = {
> + .probe = probe_gdrom,
> + .remove = remove_gdrom,
> + .driver = {
> + .name = GDROM_DEV_NAME,
> + },
> +};
> +
Well, you're half-way there. You've got probe_gdrom() as __devinit, now
remove_gdrom() needs to be __devexit, and you can wrap around it with
__devexit_p() in the gdrom_driver definition.
On 15/01/2008, Paul Mundt <[email protected]> wrote:
> On Mon, Jan 14, 2008 at 11:17:15PM +0000, Adrian McMenamin wrote:
>
> > +static bool gdrom_data_request(void)
> > +{
> > + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
> > +}
> > +
> Andrew first pointed this out, and this is still broken.
>
Eh, no, he didn't. What is wrong with it?
He compalined about excessively long busy waiting and then not
checking if the busy wait failed. Both those have been fixed.
On Sat, Jan 12, 2008 at 05:36:30AM -0800, Andrew Morton wrote:
> On Fri, 11 Jan 2008 21:56:49 +0000 Adrian McMenamin <[email protected]> wrote:
> > +/* keep the function looking like the universal CD Rom specification - returning int*/
> > +static int gdrom_packetcommand(struct cdrom_device_info *cd_info, struct packet_command *command)
> > +{
> > + gdrom_spicommand(&command->cmd, command->buflen);
> > + return 0;
> > +}
>
> Please pass the diff through scripts/checkpatch.pl. Some things, like the
> above, you may choose to fix. Some you definitely will.
On Tue, Jan 15, 2008 at 08:41:39PM +0000, Adrian McMenamin wrote:
> On 15/01/2008, Paul Mundt <[email protected]> wrote:
> > On Mon, Jan 14, 2008 at 11:17:15PM +0000, Adrian McMenamin wrote:
>
> >
> > > +static bool gdrom_data_request(void)
> > > +{
> > > + return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
> > > +}
> > > +
> > Andrew first pointed this out, and this is still broken.
> >
>
> Eh, no, he didn't. What is wrong with it?
>
Quoted above for your convenience.
> He compalined about excessively long busy waiting and then not
> checking if the busy wait failed. Both those have been fixed.
This was also covered in the checkpatch output that you conveniently
trimmed in your reply. If you can't see the problem, either your version
of checkpatch or your editor are broken. Huge amounts of your patch
continue to be whitespace damaged, and while you claim to have fixed
that, checkpatch continually whines about the same thing in each
iteration of your patch. Please just fix it up instead of arguing about
it, thanks.
On Mon, 2008-01-14 at 23:17 +0000, Adrian McMenamin wrote:
> On Mon, 2008-01-14 at 23:00 +0000, Adrian McMenamin wrote:
> > From: Adrian McMenamin <[email protected]>
> >
> > This patch adds support for the GD-Rom drive, SEGA's proprietary
> > implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
> > implements Sega's Packet Interface (SPI) - at least partially. It will
> > also read disks in SEGA's propreitary GD format.
> >
> > Unlike previous drivers (which were never in mainline) this uses DMA and
> > not PIO to read disks. It is a new driver, not a refactoring of old
> > drivers.
> >
> > Hopefully this patch addresses some issues that have been raised by
> > Andrew. Jens previously ack'ed this, but I've left that off (though the
> > IO code hasn't really been touched).
> >
> > Signed-off by: Adrian McMenamin <[email protected]>
> >
> > (Jens - this awaits your ack before going in Paul's queue for the 2.6.25
> > window)
> >
>
I think I have now removed all the whitespace issues.
Signed-off by: Adrian McMenamin <[email protected]>
-------
diff -rupN a/drivers/block/Kconfig b/drivers/block/Kconfig
--- a/drivers/block/Kconfig 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/block/Kconfig 2008-01-14 22:35:38.000000000 +0000
@@ -105,6 +105,17 @@ config PARIDE
"MicroSolutions backpack protocol", "DataStor Commuter protocol"
etc.).
+config GDROM
+ tristate "SEGA Dreamcast GD-ROM drive"
+ depends on SH_DREAMCAST
+ help
+ A standard SEGA Dreamcast comes with a modified CD ROM drive called a
+ "GD-ROM" by SEGA to signify it is capable of reading special disks
+ with up to 1 GB of data. This drive will also read standard CD ROM
+ disks. Select this option to access any disks in your GD ROM drive.
+ Most users will want to say "Y" here.
+ You can also build this as a module which will be called gdrom.ko
+
source "drivers/block/paride/Kconfig"
config BLK_CPQ_DA
diff -rupN a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
--- a/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/cdrom/gdrom.c 2008-01-16 23:47:36.000000000 +0000
@@ -0,0 +1,867 @@
+/* GD ROM driver for the SEGA Dreamcast
+ * copyright Adrian McMenamin, 2007
+ * With thanks to Marcus Comstedt and Nathan Keynes
+ * for work in reversing PIO and DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/mach/sysasic.h>
+
+#define GDROM_DEV_NAME "gdrom"
+#define GD_SESSION_OFFSET 150
+
+/* GD Rom commands */
+#define GDROM_COM_SOFTRESET 0x08
+#define GDROM_COM_EXECDIAG 0x90
+#define GDROM_COM_PACKET 0xA0
+#define GDROM_COM_IDDEV 0xA1
+
+/* GD Rom registers */
+#define GDROM_BASE_REG 0xA05F7000
+#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
+#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
+#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
+#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
+#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
+#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
+#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
+#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
+#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
+#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
+
+#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
+#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
+#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
+#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
+#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
+#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
+#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
+
+#define GDROM_HARD_SECTOR 2048
+#define BLOCK_LAYER_SECTOR 512
+#define GD_TO_BLK 4
+
+#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
+
+static const struct {
+ int sense_key;
+ const char * const text;
+} sense_texts[] = {
+ {NO_SENSE, "OK"},
+ {RECOVERED_ERROR, "Recovered from error"},
+ {NOT_READY, "Device not ready"},
+ {MEDIUM_ERROR, "Disk not ready"},
+ {HARDWARE_ERROR, "Hardware error"},
+ {ILLEGAL_REQUEST, "Command has failed"},
+ {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+ {DATA_PROTECT, "Data protection error"},
+ {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static DECLARE_WAIT_QUEUE_HEAD(command_queue);
+static DECLARE_WAIT_QUEUE_HEAD(request_queue);
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+ unsigned int entry[99];
+ unsigned int first, last;
+ unsigned int leadout;
+};
+
+static struct gdrom_unit {
+ struct gendisk *disk;
+ struct cdrom_device_info *cd_info;
+ int status;
+ int pending;
+ int transfer;
+ char disk_type;
+ struct gdromtoc *toc;
+ struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+ char mid;
+ char modid;
+ char verid;
+ char padA[13];
+ char mname[16];
+ char modname[16];
+ char firmver[16];
+ char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static bool gdrom_wait_clrbusy(void)
+{
+ unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
+ (time_before(jiffies, timeout)))
+ cpu_relax();
+ return time_before(jiffies, timeout + 1);
+}
+
+static bool gdrom_wait_busy_sleeps(void)
+{
+ unsigned long timeout;
+ /* Wait to get busy first */
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while (!gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ /* Now wait for busy to clear */
+ return gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+ int c;
+ short *data = buf;
+ /* If the device won't clear it has probably
+ * been hit by a serious failure - but we'll
+ * try to return a sense key even so */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ /* now read in the data */
+ for (c = 0; c < 40; c++)
+ data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+ short *cmd = spi_string;
+ unsigned long timeout;
+
+ /* ensure IRQ_WAIT is set */
+ ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+ /* specify how many bytes we expect back */
+ ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+ ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+ /* other parameters */
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_ERROR_REG);
+ /* Wait until we can go */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ while (!gdrom_data_request() && time_before(jiffies, timeout))
+ cpu_relax();
+ if (!time_before(jiffies, timeout + 1)) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+ gdrom_hardreset(gd.cd_info);
+ if (!gdrom_wait_clrbusy())
+ return 0;
+ ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return 0;
+ return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+ struct packet_command *spin_command;
+ spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!spin_command)
+ return -ENOMEM;
+ spin_command->cmd[0] = 0x70;
+ spin_command->cmd[2] = 0x1f;
+ spin_command->buflen = 0;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, spin_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ gd.pending = 0;
+ kfree(spin_command);
+ if (gd.status & 0x01) {
+ /* log an error */
+ gdrom_getsense(NULL);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8 ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+ int tocsize;
+ struct packet_command *toc_command;
+ int err = 0;
+
+ toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!toc_command)
+ return -ENOMEM;
+ tocsize = sizeof(struct gdromtoc);
+ toc_command->cmd[0] = 0x14;
+ toc_command->cmd[1] = session;
+ toc_command->cmd[3] = tocsize >> 8;
+ toc_command->cmd[4] = tocsize & 0xff;
+ toc_command->buflen = tocsize;
+ if (gd.pending) {
+ err = -EBUSY;
+ goto cleanup_readtoc_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, toc_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending) {
+ err = -EINVAL;
+ goto cleanup_readtoc;
+ }
+ insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+ if (gd.status & 0x01)
+ err = -EINVAL;
+
+cleanup_readtoc:
+ gd.pending = 0;
+cleanup_readtoc_final:
+ kfree(toc_command);
+ return err;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+ return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+ return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+ return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
+ struct cdrom_multisession *ms_info)
+{
+ int fentry, lentry, track, data, tocuse, err;
+ if (!gd.toc)
+ return -ENOMEM;
+ tocuse = 1;
+ /* Check if GD-ROM */
+ err = gdrom_readtoc_cmd(gd.toc, 1);
+ /* Not a GD-ROM so check if standard CD-ROM */
+ if (err) {
+ tocuse = 0;
+ err = gdrom_readtoc_cmd(gd.toc, 0);
+ if (err) {
+ printk(KERN_INFO "GDROM: Could not get CD "
+ "table of contents\n");
+ return -ENXIO;
+ }
+ }
+
+ fentry = get_entry_track(gd.toc->first);
+ lentry = get_entry_track(gd.toc->last);
+ /* Find the first data track */
+ track = get_entry_track(gd.toc->last);
+ do {
+ data = gd.toc->entry[track - 1];
+ if (get_entry_q_ctrl(data))
+ break; /* ie a real data track */
+ track--;
+ } while (track >= fentry);
+
+ if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+ printk(KERN_INFO "GDROM: No data on the last "
+ "session of the CD\n");
+ gdrom_getsense(NULL);
+ return -ENXIO;
+ }
+
+ ms_info->addr_format = CDROM_LBA;
+ ms_info->addr.lba = get_entry_lba(data);
+ ms_info->xa_flag = 1;
+ return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+ /* spin up the disk */
+ return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* read the sense key */
+ char sense = ctrl_inb(GDROM_ERROR_REG);
+ sense &= 0xF0;
+ if (sense == 0)
+ return CDS_DISC_OK;
+ if (sense == 0x20)
+ return CDS_DRIVE_NOT_READY;
+ /* default */
+ return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* check the sense key */
+ return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+ int count;
+ ctrl_outl(0x1fffff, GDROM_RESET_REG);
+ for (count = 0xa0000000; count < 0xa0200000; count += 4)
+ ctrl_inl(count);
+ return 0;
+}
+
+/* keep the function looking like the universal
+ * CD Rom specification - returning int */
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command)
+{
+ gdrom_spicommand(&command->cmd, command->buflen);
+ return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+ struct packet_command *sense_command;
+ short sense[5];
+ int sense_key;
+ int err = -EIO;
+
+ sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!sense_command)
+ return -ENOMEM;
+ sense_command->cmd[0] = 0x13;
+ sense_command->cmd[4] = 10;
+ sense_command->buflen = 10;
+ /* even if something is pending try to get
+ * the sense key if possible */
+ if (gd.pending && !gdrom_wait_clrbusy()) {
+ err = -EBUSY;
+ goto cleanup_sense_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, sense_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending)
+ goto cleanup_sense;
+ insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
+ if (sense[1] & 40) {
+ printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+ goto cleanup_sense;
+ }
+ sense_key = sense[1] & 0x0F;
+ if (sense_key < ARRAY_SIZE(sense_texts))
+ printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+ else
+ printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+ if (bufstring) /* return addional sense data */
+ memcpy(bufstring, &sense[4], 2);
+ if (sense_key < 2)
+ err = 0;
+
+cleanup_sense:
+ gd.pending = 0;
+cleanup_sense_final:
+ kfree(sense_command);
+ return err;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+ .open = gdrom_open,
+ .release = gdrom_release,
+ .drive_status = gdrom_drivestatus,
+ .media_changed = gdrom_mediachanged,
+ .get_last_session = gdrom_get_last_session,
+ .reset = gdrom_hardreset,
+ .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+ CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+ .n_minors = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+ return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+ return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+ return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
+ unsigned cmd, unsigned long arg)
+{
+ return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+ .owner = THIS_MODULE,
+ .open = gdrom_bdops_open,
+ .release = gdrom_bdops_release,
+ .media_changed = gdrom_bdops_mediachanged,
+ .ioctl = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.pending != 1)
+ return IRQ_HANDLED;
+ gd.pending = 0;
+ wake_up_interruptible(&command_queue);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.transfer != 1)
+ return IRQ_HANDLED;
+ gd.transfer = 0;
+ wake_up_interruptible(&request_queue);
+ return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+ int err;
+
+ err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
+ IRQF_DISABLED, "gdrom_command", &gd);
+ if (err)
+ return err;
+ err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
+ IRQF_DISABLED, "gdrom_dma", &gd);
+ if (err)
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+ int err, block, block_cnt;
+ struct packet_command *read_command;
+ struct list_head *elem, *next;
+ struct request *req;
+ unsigned long timeout;
+
+ if (list_empty(&gdrom_deferred))
+ return;
+ read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!read_command)
+ return; /* get more memory later? */
+ read_command->cmd[0] = 0x30;
+ read_command->cmd[1] = 0x20;
+ spin_lock(&gdrom_lock);
+ list_for_each_safe(elem, next, &gdrom_deferred) {
+ req = list_entry(elem, struct request, queuelist);
+ spin_unlock(&gdrom_lock);
+ block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = req->nr_sectors/GD_TO_BLK;
+ ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+ ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+ ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+ ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+ read_command->cmd[2] = (block >> 16) & 0xFF;
+ read_command->cmd[3] = (block >> 8) & 0xFF;
+ read_command->cmd[4] = block & 0xFF;
+ read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+ read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+ read_command->cmd[10] = block_cnt & 0xFF;
+ /* set for DMA */
+ ctrl_outb(1, GDROM_ERROR_REG);
+ /* other registers */
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_BCL_REG);
+ ctrl_outb(0, GDROM_BCH_REG);
+ ctrl_outb(0, GDROM_DSEL_REG);
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ /* Wait for registers to reset after any previous activity */
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ timeout = jiffies + HZ / 2;
+ /* Wait for packet command to finish */
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ gd.pending = 1;
+ gd.transfer = 1;
+ outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+ timeout = jiffies + HZ / 2;
+ /* Wait for any pending DMA to finish */
+ while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+ time_before(jiffies, timeout))
+ cpu_relax();
+ /* start transfer */
+ ctrl_outb(1, GDROM_DMA_STATUS_REG);
+ wait_event_interruptible_timeout(request_queue,
+ gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
+ err = gd.transfer;
+ gd.transfer = 0;
+ gd.pending = 0;
+ /* now seek to take the request spinlock
+ * before handling ending the request */
+ spin_lock(&gdrom_lock);
+ list_del_init(&req->queuelist);
+ end_dequeued_request(req, 1 - err);
+ }
+ spin_unlock(&gdrom_lock);
+ kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+ /* dequeue, add to list of deferred work
+ * and then schedule workqueue */
+ blkdev_dequeue_request(req);
+ list_add_tail(&req->queuelist, &gdrom_deferred);
+ schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+ struct request *req;
+
+ while ((req = elv_next_request(rq)) != NULL) {
+ if (!blk_fs_request(req)) {
+ printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+ end_request(req, 0);
+ }
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_NOTICE "GDROM: Read only device -");
+ printk(" write request ignored\n");
+ end_request(req, 0);
+ }
+ if (req->nr_sectors)
+ gdrom_request_handler_dma(req);
+ else
+ end_request(req, 0);
+ }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+ struct gdrom_id *id;
+ char *model_name, *manuf_name, *firmw_ver;
+ int err = -ENOMEM;
+
+ /* query device ID */
+ id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+ if (!id)
+ return err;
+ gdrom_identifydevice(id);
+ model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+ if (!model_name)
+ goto free_id;
+ manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+ if (!manuf_name)
+ goto free_model_name;
+ firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+ if (!firmw_ver)
+ goto free_manuf_name;
+ printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
+ model_name, manuf_name, firmw_ver);
+ err = 0;
+ kfree(firmw_ver);
+free_manuf_name:
+ kfree(manuf_name);
+free_model_name:
+ kfree(model_name);
+free_id:
+ kfree(id);
+ return err;
+}
+
+/* set the default mode for DMA transfer */
+static int __devinit gdrom_init_dma_mode(void)
+{
+ ctrl_outb(0x13, GDROM_ERROR_REG);
+ ctrl_outb(0x22, GDROM_INTSEC_REG);
+ if (!gdrom_wait_clrbusy())
+ return -EBUSY;
+ ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return -EBUSY;
+ /* Memory protection setting for GDROM DMA
+ * Bits 31 - 16 security: 0x8843
+ * Bits 15 and 7 reserved (0)
+ * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
+ * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
+ * (0x40 | 0x80) = start range at 0x0C000000
+ * (0x7F | 0x80) = end range at 0x0FFFFFFF */
+ ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
+ ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+ return 0;
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+ gd.cd_info->ops = &gdrom_ops;
+ gd.cd_info->capacity = 1;
+ strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+ gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
+ CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+ gd.disk->major = gdrom_major;
+ gd.disk->first_minor = 1;
+ gd.disk->minors = 1;
+ strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static int __devinit probe_gdrom_setupqueue(void)
+{
+ blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+ /* using DMA so memory will need to be contiguous */
+ blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+ /* set a large max size to get most from DMA */
+ blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+ gd.disk->queue = gd.gdrom_rq;
+ return gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+ int err;
+ /* Start the device */
+ if (gdrom_execute_diagnostic() != 1) {
+ printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+ return -ENODEV;
+ }
+ /* Print out firmware ID */
+ if (gdrom_outputversion())
+ return -ENOMEM;
+ /* Register GDROM */
+ gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+ if (gdrom_major <= 0)
+ return gdrom_major;
+ printk(KERN_INFO "GDROM: Registered with major number %d\n",
+ gdrom_major);
+ /* Specify basic properties of drive */
+ gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+ if (!gd.cd_info) {
+ err = -ENOMEM;
+ goto probe_fail_no_mem;
+ }
+ probe_gdrom_setupcd();
+ gd.disk = alloc_disk(1);
+ if (!gd.disk) {
+ err = -ENODEV;
+ goto probe_fail_no_disk;
+ }
+ probe_gdrom_setupdisk();
+ if (register_cdrom(gd.cd_info)) {
+ err = -ENODEV;
+ goto probe_fail_cdrom_register;
+ }
+ gd.disk->fops = &gdrom_bdops;
+ /* latch on to the interrupt */
+ err = gdrom_set_interrupt_handlers();
+ if (err)
+ goto probe_fail_cmdirq_register;
+ gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+ if (!gd.gdrom_rq)
+ goto probe_fail_requestq;
+
+ err = probe_gdrom_setupqueue();
+ if (err)
+ goto probe_fail_toc;
+
+ gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+ if (!gd.toc)
+ goto probe_fail_toc;
+ add_disk(gd.disk);
+ return 0;
+
+probe_fail_toc:
+ blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+ del_gendisk(gd.disk);
+probe_fail_no_disk:
+ kfree(gd.cd_info);
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ gdrom_major = 0;
+probe_fail_no_mem:
+ printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
+ return err;
+}
+
+static int remove_gdrom(struct platform_device *devptr)
+{
+ flush_scheduled_work();
+ blk_cleanup_queue(gd.gdrom_rq);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ del_gendisk(gd.disk);
+ if (gdrom_major)
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+ .probe = probe_gdrom,
+ .remove = remove_gdrom,
+ .driver = {
+ .name = GDROM_DEV_NAME,
+ },
+};
+
+static int __init init_gdrom(void)
+{
+ int rc;
+ gd.toc = NULL;
+ rc = platform_driver_register(&gdrom_driver);
+ if (rc)
+ return rc;
+ pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+ if (IS_ERR(pd)) {
+ platform_driver_unregister(&gdrom_driver);
+ return PTR_ERR(pd);
+ }
+ return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+ platform_device_unregister(pd);
+ platform_driver_unregister(&gdrom_driver);
+ kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");
diff -rupN a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile
--- a/drivers/cdrom/Makefile 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/cdrom/Makefile 2008-01-14 22:35:39.000000000 +0000
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
+obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
On Wed, Jan 16, 2008 at 11:57:57PM +0000, Adrian McMenamin wrote:
>
> On Mon, 2008-01-14 at 23:17 +0000, Adrian McMenamin wrote:
> > On Mon, 2008-01-14 at 23:00 +0000, Adrian McMenamin wrote:
> > > From: Adrian McMenamin <[email protected]>
> > >
> > > This patch adds support for the GD-Rom drive, SEGA's proprietary
> > > implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
> > > implements Sega's Packet Interface (SPI) - at least partially. It will
> > > also read disks in SEGA's propreitary GD format.
> > >
> > > Unlike previous drivers (which were never in mainline) this uses DMA and
> > > not PIO to read disks. It is a new driver, not a refactoring of old
> > > drivers.
> > >
> > > Hopefully this patch addresses some issues that have been raised by
> > > Andrew. Jens previously ack'ed this, but I've left that off (though the
> > > IO code hasn't really been touched).
> > >
> > > Signed-off by: Adrian McMenamin <[email protected]>
> > >
> > > (Jens - this awaits your ack before going in Paul's queue for the 2.6.25
> > > window)
> > >
> >
> I think I have now removed all the whitespace issues.
>
> Signed-off by: Adrian McMenamin <[email protected]>
>
Looks better. __devexit/__devexit_p()?
From: Adrian McMenamin <[email protected]>
This patch adds support for the GD-Rom drive, SEGA's proprietary
implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
implements Sega's Packet Interface (SPI) - at least partially. It will
also read disks in SEGA's propreitary GD format.
Unlike previous drivers (which were never in mainline) this uses DMA and
not PIO to read disks. It is a new driver, not a refactoring of old
drivers.
I hope I've fixed all the white space and other issues now!
Signed-off by: Adrian McMenamin <[email protected]>
-----------
diff -rupN a/drivers/block/Kconfig b/drivers/block/Kconfig
--- a/drivers/block/Kconfig 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/block/Kconfig 2008-01-14 22:35:38.000000000 +0000
@@ -105,6 +105,17 @@ config PARIDE
"MicroSolutions backpack protocol", "DataStor Commuter protocol"
etc.).
+config GDROM
+ tristate "SEGA Dreamcast GD-ROM drive"
+ depends on SH_DREAMCAST
+ help
+ A standard SEGA Dreamcast comes with a modified CD ROM drive called a
+ "GD-ROM" by SEGA to signify it is capable of reading special disks
+ with up to 1 GB of data. This drive will also read standard CD ROM
+ disks. Select this option to access any disks in your GD ROM drive.
+ Most users will want to say "Y" here.
+ You can also build this as a module which will be called gdrom.ko
+
source "drivers/block/paride/Kconfig"
config BLK_CPQ_DA
diff -rupN a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
--- a/drivers/cdrom/gdrom.c 1970-01-01 01:00:00.000000000 +0100
+++ b/drivers/cdrom/gdrom.c 2008-01-17 22:19:22.000000000 +0000
@@ -0,0 +1,867 @@
+/* GD ROM driver for the SEGA Dreamcast
+ * copyright Adrian McMenamin, 2007
+ * With thanks to Marcus Comstedt and Nathan Keynes
+ * for work in reversing PIO and DMA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/cdrom.h>
+#include <linux/genhd.h>
+#include <linux/bio.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <linux/platform_device.h>
+#include <scsi/scsi.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <asm/mach/dma.h>
+#include <asm/mach/sysasic.h>
+
+#define GDROM_DEV_NAME "gdrom"
+#define GD_SESSION_OFFSET 150
+
+/* GD Rom commands */
+#define GDROM_COM_SOFTRESET 0x08
+#define GDROM_COM_EXECDIAG 0x90
+#define GDROM_COM_PACKET 0xA0
+#define GDROM_COM_IDDEV 0xA1
+
+/* GD Rom registers */
+#define GDROM_BASE_REG 0xA05F7000
+#define GDROM_ALTSTATUS_REG (GDROM_BASE_REG + 0x18)
+#define GDROM_DATA_REG (GDROM_BASE_REG + 0x80)
+#define GDROM_ERROR_REG (GDROM_BASE_REG + 0x84)
+#define GDROM_INTSEC_REG (GDROM_BASE_REG + 0x88)
+#define GDROM_SECNUM_REG (GDROM_BASE_REG + 0x8C)
+#define GDROM_BCL_REG (GDROM_BASE_REG + 0x90)
+#define GDROM_BCH_REG (GDROM_BASE_REG + 0x94)
+#define GDROM_DSEL_REG (GDROM_BASE_REG + 0x98)
+#define GDROM_STATUSCOMMAND_REG (GDROM_BASE_REG + 0x9C)
+#define GDROM_RESET_REG (GDROM_BASE_REG + 0x4E4)
+#define GDROM_DMA_STARTADDR_REG (GDROM_BASE_REG + 0x404)
+#define GDROM_DMA_LENGTH_REG (GDROM_BASE_REG + 0x408)
+#define GDROM_DMA_DIRECTION_REG (GDROM_BASE_REG + 0x40C)
+#define GDROM_DMA_ENABLE_REG (GDROM_BASE_REG + 0x414)
+#define GDROM_DMA_STATUS_REG (GDROM_BASE_REG + 0x418)
+#define GDROM_DMA_WAIT_REG (GDROM_BASE_REG + 0x4A0)
+#define GDROM_DMA_ACCESS_CTRL_REG (GDROM_BASE_REG + 0x4B8)
+
+#define GDROM_HARD_SECTOR 2048
+#define BLOCK_LAYER_SECTOR 512
+#define GD_TO_BLK 4
+
+#define GDROM_DEFAULT_TIMEOUT (HZ * 7)
+
+static const struct {
+ int sense_key;
+ const char * const text;
+} sense_texts[] = {
+ {NO_SENSE, "OK"},
+ {RECOVERED_ERROR, "Recovered from error"},
+ {NOT_READY, "Device not ready"},
+ {MEDIUM_ERROR, "Disk not ready"},
+ {HARDWARE_ERROR, "Hardware error"},
+ {ILLEGAL_REQUEST, "Command has failed"},
+ {UNIT_ATTENTION, "Device needs attention - disk may have been changed"},
+ {DATA_PROTECT, "Data protection error"},
+ {ABORTED_COMMAND, "Command aborted"},
+};
+
+static struct platform_device *pd;
+static int gdrom_major;
+static DECLARE_WAIT_QUEUE_HEAD(command_queue);
+static DECLARE_WAIT_QUEUE_HEAD(request_queue);
+
+static DEFINE_SPINLOCK(gdrom_lock);
+static void gdrom_readdisk_dma(struct work_struct *work);
+static DECLARE_WORK(work, gdrom_readdisk_dma);
+static LIST_HEAD(gdrom_deferred);
+
+struct gdromtoc {
+ unsigned int entry[99];
+ unsigned int first, last;
+ unsigned int leadout;
+};
+
+static struct gdrom_unit {
+ struct gendisk *disk;
+ struct cdrom_device_info *cd_info;
+ int status;
+ int pending;
+ int transfer;
+ char disk_type;
+ struct gdromtoc *toc;
+ struct request_queue *gdrom_rq;
+} gd;
+
+struct gdrom_id {
+ char mid;
+ char modid;
+ char verid;
+ char padA[13];
+ char mname[16];
+ char modname[16];
+ char firmver[16];
+ char padB[16];
+};
+
+static int gdrom_getsense(short *bufstring);
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command);
+static int gdrom_hardreset(struct cdrom_device_info *cd_info);
+
+static bool gdrom_is_busy(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) != 0;
+}
+
+static bool gdrom_data_request(void)
+{
+ return (ctrl_inb(GDROM_ALTSTATUS_REG) & 0x88) == 8;
+}
+
+static bool gdrom_wait_clrbusy(void)
+{
+ unsigned long timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while ((ctrl_inb(GDROM_ALTSTATUS_REG) & 0x80) &&
+ (time_before(jiffies, timeout)))
+ cpu_relax();
+ return time_before(jiffies, timeout + 1);
+}
+
+static bool gdrom_wait_busy_sleeps(void)
+{
+ unsigned long timeout;
+ /* Wait to get busy first */
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ while (!gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ /* Now wait for busy to clear */
+ return gdrom_wait_clrbusy();
+}
+
+static void gdrom_identifydevice(void *buf)
+{
+ int c;
+ short *data = buf;
+ /* If the device won't clear it has probably
+ * been hit by a serious failure - but we'll
+ * try to return a sense key even so */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ ctrl_outb(GDROM_COM_IDDEV, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ /* now read in the data */
+ for (c = 0; c < 40; c++)
+ data[c] = ctrl_inw(GDROM_DATA_REG);
+}
+
+static void gdrom_spicommand(void *spi_string, int buflen)
+{
+ short *cmd = spi_string;
+ unsigned long timeout;
+
+ /* ensure IRQ_WAIT is set */
+ ctrl_outb(0x08, GDROM_ALTSTATUS_REG);
+ /* specify how many bytes we expect back */
+ ctrl_outb(buflen & 0xFF, GDROM_BCL_REG);
+ ctrl_outb((buflen >> 8) & 0xFF, GDROM_BCH_REG);
+ /* other parameters */
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_ERROR_REG);
+ /* Wait until we can go */
+ if (!gdrom_wait_clrbusy()) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ timeout = jiffies + GDROM_DEFAULT_TIMEOUT;
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ while (!gdrom_data_request() && time_before(jiffies, timeout))
+ cpu_relax();
+ if (!time_before(jiffies, timeout + 1)) {
+ gdrom_getsense(NULL);
+ return;
+ }
+ outsw(PHYSADDR(GDROM_DATA_REG), cmd, 6);
+}
+
+
+/* gdrom_command_executediagnostic:
+ * Used to probe for presence of working GDROM
+ * Restarts GDROM device and then applies standard ATA 3
+ * Execute Diagnostic Command: a return of '1' indicates device 0
+ * present and device 1 absent
+ */
+static char gdrom_execute_diagnostic(void)
+{
+ gdrom_hardreset(gd.cd_info);
+ if (!gdrom_wait_clrbusy())
+ return 0;
+ ctrl_outb(GDROM_COM_EXECDIAG, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return 0;
+ return ctrl_inb(GDROM_ERROR_REG);
+}
+
+/*
+ * Prepare disk command
+ * byte 0 = 0x70
+ * byte 1 = 0x1f
+ */
+static int gdrom_preparedisk_cmd(void)
+{
+ struct packet_command *spin_command;
+ spin_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!spin_command)
+ return -ENOMEM;
+ spin_command->cmd[0] = 0x70;
+ spin_command->cmd[2] = 0x1f;
+ spin_command->buflen = 0;
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, spin_command);
+ /* 60 second timeout */
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ gd.pending = 0;
+ kfree(spin_command);
+ if (gd.status & 0x01) {
+ /* log an error */
+ gdrom_getsense(NULL);
+ return -EIO;
+ }
+ return 0;
+}
+
+/*
+ * Read TOC command
+ * byte 0 = 0x14
+ * byte 1 = session
+ * byte 3 = sizeof TOC >> 8 ie upper byte
+ * byte 4 = sizeof TOC & 0xff ie lower byte
+ */
+static int gdrom_readtoc_cmd(struct gdromtoc *toc, int session)
+{
+ int tocsize;
+ struct packet_command *toc_command;
+ int err = 0;
+
+ toc_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!toc_command)
+ return -ENOMEM;
+ tocsize = sizeof(struct gdromtoc);
+ toc_command->cmd[0] = 0x14;
+ toc_command->cmd[1] = session;
+ toc_command->cmd[3] = tocsize >> 8;
+ toc_command->cmd[4] = tocsize & 0xff;
+ toc_command->buflen = tocsize;
+ if (gd.pending) {
+ err = -EBUSY;
+ goto cleanup_readtoc_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, toc_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending) {
+ err = -EINVAL;
+ goto cleanup_readtoc;
+ }
+ insw(PHYSADDR(GDROM_DATA_REG), toc, tocsize/2);
+ if (gd.status & 0x01)
+ err = -EINVAL;
+
+cleanup_readtoc:
+ gd.pending = 0;
+cleanup_readtoc_final:
+ kfree(toc_command);
+ return err;
+}
+
+/* TOC helpers */
+static int get_entry_lba(int track)
+{
+ return (cpu_to_be32(track & 0xffffff00) - GD_SESSION_OFFSET);
+}
+
+static int get_entry_q_ctrl(int track)
+{
+ return (track & 0x000000f0) >> 4;
+}
+
+static int get_entry_track(int track)
+{
+ return (track & 0x0000ff00) >> 8;
+}
+
+static int gdrom_get_last_session(struct cdrom_device_info *cd_info,
+ struct cdrom_multisession *ms_info)
+{
+ int fentry, lentry, track, data, tocuse, err;
+ if (!gd.toc)
+ return -ENOMEM;
+ tocuse = 1;
+ /* Check if GD-ROM */
+ err = gdrom_readtoc_cmd(gd.toc, 1);
+ /* Not a GD-ROM so check if standard CD-ROM */
+ if (err) {
+ tocuse = 0;
+ err = gdrom_readtoc_cmd(gd.toc, 0);
+ if (err) {
+ printk(KERN_INFO "GDROM: Could not get CD "
+ "table of contents\n");
+ return -ENXIO;
+ }
+ }
+
+ fentry = get_entry_track(gd.toc->first);
+ lentry = get_entry_track(gd.toc->last);
+ /* Find the first data track */
+ track = get_entry_track(gd.toc->last);
+ do {
+ data = gd.toc->entry[track - 1];
+ if (get_entry_q_ctrl(data))
+ break; /* ie a real data track */
+ track--;
+ } while (track >= fentry);
+
+ if ((track > 100) || (track < get_entry_track(gd.toc->first))) {
+ printk(KERN_INFO "GDROM: No data on the last "
+ "session of the CD\n");
+ gdrom_getsense(NULL);
+ return -ENXIO;
+ }
+
+ ms_info->addr_format = CDROM_LBA;
+ ms_info->addr.lba = get_entry_lba(data);
+ ms_info->xa_flag = 1;
+ return 0;
+}
+
+static int gdrom_open(struct cdrom_device_info *cd_info, int purpose)
+{
+ /* spin up the disk */
+ return gdrom_preparedisk_cmd();
+}
+
+/* this function is required even if empty */
+static void gdrom_release(struct cdrom_device_info *cd_info)
+{
+}
+
+static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* read the sense key */
+ char sense = ctrl_inb(GDROM_ERROR_REG);
+ sense &= 0xF0;
+ if (sense == 0)
+ return CDS_DISC_OK;
+ if (sense == 0x20)
+ return CDS_DRIVE_NOT_READY;
+ /* default */
+ return CDS_NO_INFO;
+}
+
+static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+{
+ /* check the sense key */
+ return (ctrl_inb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+}
+
+/* reset the G1 bus */
+static int gdrom_hardreset(struct cdrom_device_info *cd_info)
+{
+ int count;
+ ctrl_outl(0x1fffff, GDROM_RESET_REG);
+ for (count = 0xa0000000; count < 0xa0200000; count += 4)
+ ctrl_inl(count);
+ return 0;
+}
+
+/* keep the function looking like the universal
+ * CD Rom specification - returning int */
+static int gdrom_packetcommand(struct cdrom_device_info *cd_info,
+ struct packet_command *command)
+{
+ gdrom_spicommand(&command->cmd, command->buflen);
+ return 0;
+}
+
+/* Get Sense SPI command
+ * From Marcus Comstedt
+ * cmd = 0x13
+ * cmd + 4 = length of returned buffer
+ * Returns 5 16 bit words
+ */
+static int gdrom_getsense(short *bufstring)
+{
+ struct packet_command *sense_command;
+ short sense[5];
+ int sense_key;
+ int err = -EIO;
+
+ sense_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!sense_command)
+ return -ENOMEM;
+ sense_command->cmd[0] = 0x13;
+ sense_command->cmd[4] = 10;
+ sense_command->buflen = 10;
+ /* even if something is pending try to get
+ * the sense key if possible */
+ if (gd.pending && !gdrom_wait_clrbusy()) {
+ err = -EBUSY;
+ goto cleanup_sense_final;
+ }
+ gd.pending = 1;
+ gdrom_packetcommand(gd.cd_info, sense_command);
+ wait_event_interruptible_timeout(command_queue, gd.pending == 0,
+ GDROM_DEFAULT_TIMEOUT);
+ if (gd.pending)
+ goto cleanup_sense;
+ insw(PHYSADDR(GDROM_DATA_REG), &sense, sense_command->buflen/2);
+ if (sense[1] & 40) {
+ printk(KERN_INFO "GDROM: Drive not ready - command aborted\n");
+ goto cleanup_sense;
+ }
+ sense_key = sense[1] & 0x0F;
+ if (sense_key < ARRAY_SIZE(sense_texts))
+ printk(KERN_INFO "GDROM: %s\n", sense_texts[sense_key].text);
+ else
+ printk(KERN_ERR "GDROM: Unknown sense key: %d\n", sense_key);
+ if (bufstring) /* return addional sense data */
+ memcpy(bufstring, &sense[4], 2);
+ if (sense_key < 2)
+ err = 0;
+
+cleanup_sense:
+ gd.pending = 0;
+cleanup_sense_final:
+ kfree(sense_command);
+ return err;
+}
+
+static struct cdrom_device_ops gdrom_ops = {
+ .open = gdrom_open,
+ .release = gdrom_release,
+ .drive_status = gdrom_drivestatus,
+ .media_changed = gdrom_mediachanged,
+ .get_last_session = gdrom_get_last_session,
+ .reset = gdrom_hardreset,
+ .capability = CDC_MULTI_SESSION | CDC_MEDIA_CHANGED |
+ CDC_RESET | CDC_DRIVE_STATUS | CDC_CD_R,
+ .n_minors = 1,
+};
+
+static int gdrom_bdops_open(struct inode *inode, struct file *file)
+{
+ return cdrom_open(gd.cd_info, inode, file);
+}
+
+static int gdrom_bdops_release(struct inode *inode, struct file *file)
+{
+ return cdrom_release(gd.cd_info, file);
+}
+
+static int gdrom_bdops_mediachanged(struct gendisk *disk)
+{
+ return cdrom_media_changed(gd.cd_info);
+}
+
+static int gdrom_bdops_ioctl(struct inode *inode, struct file *file,
+ unsigned cmd, unsigned long arg)
+{
+ return cdrom_ioctl(file, gd.cd_info, inode, cmd, arg);
+}
+
+static struct block_device_operations gdrom_bdops = {
+ .owner = THIS_MODULE,
+ .open = gdrom_bdops_open,
+ .release = gdrom_bdops_release,
+ .media_changed = gdrom_bdops_mediachanged,
+ .ioctl = gdrom_bdops_ioctl,
+};
+
+static irqreturn_t gdrom_command_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.pending != 1)
+ return IRQ_HANDLED;
+ gd.pending = 0;
+ wake_up_interruptible(&command_queue);
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t gdrom_dma_interrupt(int irq, void *dev_id)
+{
+ gd.status = ctrl_inb(GDROM_STATUSCOMMAND_REG);
+ if (gd.transfer != 1)
+ return IRQ_HANDLED;
+ gd.transfer = 0;
+ wake_up_interruptible(&request_queue);
+ return IRQ_HANDLED;
+}
+
+static int __devinit gdrom_set_interrupt_handlers(void)
+{
+ int err;
+
+ err = request_irq(HW_EVENT_GDROM_CMD, gdrom_command_interrupt,
+ IRQF_DISABLED, "gdrom_command", &gd);
+ if (err)
+ return err;
+ err = request_irq(HW_EVENT_GDROM_DMA, gdrom_dma_interrupt,
+ IRQF_DISABLED, "gdrom_dma", &gd);
+ if (err)
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ return err;
+}
+
+/* Implement DMA read using SPI command
+ * 0 -> 0x30
+ * 1 -> mode
+ * 2 -> block >> 16
+ * 3 -> block >> 8
+ * 4 -> block
+ * 8 -> sectors >> 16
+ * 9 -> sectors >> 8
+ * 10 -> sectors
+ */
+static void gdrom_readdisk_dma(struct work_struct *work)
+{
+ int err, block, block_cnt;
+ struct packet_command *read_command;
+ struct list_head *elem, *next;
+ struct request *req;
+ unsigned long timeout;
+
+ if (list_empty(&gdrom_deferred))
+ return;
+ read_command = kzalloc(sizeof(struct packet_command), GFP_KERNEL);
+ if (!read_command)
+ return; /* get more memory later? */
+ read_command->cmd[0] = 0x30;
+ read_command->cmd[1] = 0x20;
+ spin_lock(&gdrom_lock);
+ list_for_each_safe(elem, next, &gdrom_deferred) {
+ req = list_entry(elem, struct request, queuelist);
+ spin_unlock(&gdrom_lock);
+ block = req->sector/GD_TO_BLK + GD_SESSION_OFFSET;
+ block_cnt = req->nr_sectors/GD_TO_BLK;
+ ctrl_outl(PHYSADDR(req->buffer), GDROM_DMA_STARTADDR_REG);
+ ctrl_outl(block_cnt * GDROM_HARD_SECTOR, GDROM_DMA_LENGTH_REG);
+ ctrl_outl(1, GDROM_DMA_DIRECTION_REG);
+ ctrl_outl(1, GDROM_DMA_ENABLE_REG);
+ read_command->cmd[2] = (block >> 16) & 0xFF;
+ read_command->cmd[3] = (block >> 8) & 0xFF;
+ read_command->cmd[4] = block & 0xFF;
+ read_command->cmd[8] = (block_cnt >> 16) & 0xFF;
+ read_command->cmd[9] = (block_cnt >> 8) & 0xFF;
+ read_command->cmd[10] = block_cnt & 0xFF;
+ /* set for DMA */
+ ctrl_outb(1, GDROM_ERROR_REG);
+ /* other registers */
+ ctrl_outb(0, GDROM_SECNUM_REG);
+ ctrl_outb(0, GDROM_BCL_REG);
+ ctrl_outb(0, GDROM_BCH_REG);
+ ctrl_outb(0, GDROM_DSEL_REG);
+ ctrl_outb(0, GDROM_INTSEC_REG);
+ /* Wait for registers to reset after any previous activity */
+ timeout = jiffies + HZ / 2;
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ ctrl_outb(GDROM_COM_PACKET, GDROM_STATUSCOMMAND_REG);
+ timeout = jiffies + HZ / 2;
+ /* Wait for packet command to finish */
+ while (gdrom_is_busy() && time_before(jiffies, timeout))
+ cpu_relax();
+ gd.pending = 1;
+ gd.transfer = 1;
+ outsw(PHYSADDR(GDROM_DATA_REG), &read_command->cmd, 6);
+ timeout = jiffies + HZ / 2;
+ /* Wait for any pending DMA to finish */
+ while (ctrl_inb(GDROM_DMA_STATUS_REG) &&
+ time_before(jiffies, timeout))
+ cpu_relax();
+ /* start transfer */
+ ctrl_outb(1, GDROM_DMA_STATUS_REG);
+ wait_event_interruptible_timeout(request_queue,
+ gd.transfer == 0, GDROM_DEFAULT_TIMEOUT);
+ err = gd.transfer;
+ gd.transfer = 0;
+ gd.pending = 0;
+ /* now seek to take the request spinlock
+ * before handling ending the request */
+ spin_lock(&gdrom_lock);
+ list_del_init(&req->queuelist);
+ end_dequeued_request(req, 1 - err);
+ }
+ spin_unlock(&gdrom_lock);
+ kfree(read_command);
+}
+
+static void gdrom_request_handler_dma(struct request *req)
+{
+ /* dequeue, add to list of deferred work
+ * and then schedule workqueue */
+ blkdev_dequeue_request(req);
+ list_add_tail(&req->queuelist, &gdrom_deferred);
+ schedule_work(&work);
+}
+
+static void gdrom_request(struct request_queue *rq)
+{
+ struct request *req;
+
+ while ((req = elv_next_request(rq)) != NULL) {
+ if (!blk_fs_request(req)) {
+ printk(KERN_DEBUG "GDROM: Non-fs request ignored\n");
+ end_request(req, 0);
+ }
+ if (rq_data_dir(req) != READ) {
+ printk(KERN_NOTICE "GDROM: Read only device -");
+ printk(" write request ignored\n");
+ end_request(req, 0);
+ }
+ if (req->nr_sectors)
+ gdrom_request_handler_dma(req);
+ else
+ end_request(req, 0);
+ }
+}
+
+/* Print string identifying GD ROM device */
+static int __devinit gdrom_outputversion(void)
+{
+ struct gdrom_id *id;
+ char *model_name, *manuf_name, *firmw_ver;
+ int err = -ENOMEM;
+
+ /* query device ID */
+ id = kzalloc(sizeof(struct gdrom_id), GFP_KERNEL);
+ if (!id)
+ return err;
+ gdrom_identifydevice(id);
+ model_name = kstrndup(id->modname, 16, GFP_KERNEL);
+ if (!model_name)
+ goto free_id;
+ manuf_name = kstrndup(id->mname, 16, GFP_KERNEL);
+ if (!manuf_name)
+ goto free_model_name;
+ firmw_ver = kstrndup(id->firmver, 16, GFP_KERNEL);
+ if (!firmw_ver)
+ goto free_manuf_name;
+ printk(KERN_INFO "GDROM: %s from %s with firmware %s\n",
+ model_name, manuf_name, firmw_ver);
+ err = 0;
+ kfree(firmw_ver);
+free_manuf_name:
+ kfree(manuf_name);
+free_model_name:
+ kfree(model_name);
+free_id:
+ kfree(id);
+ return err;
+}
+
+/* set the default mode for DMA transfer */
+static int __devinit gdrom_init_dma_mode(void)
+{
+ ctrl_outb(0x13, GDROM_ERROR_REG);
+ ctrl_outb(0x22, GDROM_INTSEC_REG);
+ if (!gdrom_wait_clrbusy())
+ return -EBUSY;
+ ctrl_outb(0xEF, GDROM_STATUSCOMMAND_REG);
+ if (!gdrom_wait_busy_sleeps())
+ return -EBUSY;
+ /* Memory protection setting for GDROM DMA
+ * Bits 31 - 16 security: 0x8843
+ * Bits 15 and 7 reserved (0)
+ * Bits 14 - 8 start of transfer range in 1 MB blocks OR'ed with 0x80
+ * Bits 6 - 0 end of transfer range in 1 MB blocks OR'ed with 0x80
+ * (0x40 | 0x80) = start range at 0x0C000000
+ * (0x7F | 0x80) = end range at 0x0FFFFFFF */
+ ctrl_outl(0x8843407F, GDROM_DMA_ACCESS_CTRL_REG);
+ ctrl_outl(9, GDROM_DMA_WAIT_REG); /* DMA word setting */
+ return 0;
+}
+
+static void __devinit probe_gdrom_setupcd(void)
+{
+ gd.cd_info->ops = &gdrom_ops;
+ gd.cd_info->capacity = 1;
+ strcpy(gd.cd_info->name, GDROM_DEV_NAME);
+ gd.cd_info->mask = CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|
+ CDC_SELECT_DISC;
+}
+
+static void __devinit probe_gdrom_setupdisk(void)
+{
+ gd.disk->major = gdrom_major;
+ gd.disk->first_minor = 1;
+ gd.disk->minors = 1;
+ strcpy(gd.disk->disk_name, GDROM_DEV_NAME);
+}
+
+static int __devinit probe_gdrom_setupqueue(void)
+{
+ blk_queue_hardsect_size(gd.gdrom_rq, GDROM_HARD_SECTOR);
+ /* using DMA so memory will need to be contiguous */
+ blk_queue_max_hw_segments(gd.gdrom_rq, 1);
+ /* set a large max size to get most from DMA */
+ blk_queue_max_segment_size(gd.gdrom_rq, 0x40000);
+ gd.disk->queue = gd.gdrom_rq;
+ return gdrom_init_dma_mode();
+}
+
+/*
+ * register this as a block device and as compliant with the
+ * universal CD Rom driver interface
+ */
+static int __devinit probe_gdrom(struct platform_device *devptr)
+{
+ int err;
+ /* Start the device */
+ if (gdrom_execute_diagnostic() != 1) {
+ printk(KERN_WARNING "GDROM: ATA Probe for GDROM failed.\n");
+ return -ENODEV;
+ }
+ /* Print out firmware ID */
+ if (gdrom_outputversion())
+ return -ENOMEM;
+ /* Register GDROM */
+ gdrom_major = register_blkdev(0, GDROM_DEV_NAME);
+ if (gdrom_major <= 0)
+ return gdrom_major;
+ printk(KERN_INFO "GDROM: Registered with major number %d\n",
+ gdrom_major);
+ /* Specify basic properties of drive */
+ gd.cd_info = kzalloc(sizeof(struct cdrom_device_info), GFP_KERNEL);
+ if (!gd.cd_info) {
+ err = -ENOMEM;
+ goto probe_fail_no_mem;
+ }
+ probe_gdrom_setupcd();
+ gd.disk = alloc_disk(1);
+ if (!gd.disk) {
+ err = -ENODEV;
+ goto probe_fail_no_disk;
+ }
+ probe_gdrom_setupdisk();
+ if (register_cdrom(gd.cd_info)) {
+ err = -ENODEV;
+ goto probe_fail_cdrom_register;
+ }
+ gd.disk->fops = &gdrom_bdops;
+ /* latch on to the interrupt */
+ err = gdrom_set_interrupt_handlers();
+ if (err)
+ goto probe_fail_cmdirq_register;
+ gd.gdrom_rq = blk_init_queue(gdrom_request, &gdrom_lock);
+ if (!gd.gdrom_rq)
+ goto probe_fail_requestq;
+
+ err = probe_gdrom_setupqueue();
+ if (err)
+ goto probe_fail_toc;
+
+ gd.toc = kzalloc(sizeof(struct gdromtoc), GFP_KERNEL);
+ if (!gd.toc)
+ goto probe_fail_toc;
+ add_disk(gd.disk);
+ return 0;
+
+probe_fail_toc:
+ blk_cleanup_queue(gd.gdrom_rq);
+probe_fail_requestq:
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+probe_fail_cmdirq_register:
+probe_fail_cdrom_register:
+ del_gendisk(gd.disk);
+probe_fail_no_disk:
+ kfree(gd.cd_info);
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ gdrom_major = 0;
+probe_fail_no_mem:
+ printk(KERN_WARNING "GDROM: Probe failed - error is 0x%X\n", err);
+ return err;
+}
+
+static int __devexit remove_gdrom(struct platform_device *devptr)
+{
+ flush_scheduled_work();
+ blk_cleanup_queue(gd.gdrom_rq);
+ free_irq(HW_EVENT_GDROM_CMD, &gd);
+ free_irq(HW_EVENT_GDROM_DMA, &gd);
+ del_gendisk(gd.disk);
+ if (gdrom_major)
+ unregister_blkdev(gdrom_major, GDROM_DEV_NAME);
+ return unregister_cdrom(gd.cd_info);
+}
+
+static struct platform_driver gdrom_driver = {
+ .probe = probe_gdrom,
+ .remove = __devexit_p(remove_gdrom),
+ .driver = {
+ .name = GDROM_DEV_NAME,
+ },
+};
+
+static int __init init_gdrom(void)
+{
+ int rc;
+ gd.toc = NULL;
+ rc = platform_driver_register(&gdrom_driver);
+ if (rc)
+ return rc;
+ pd = platform_device_register_simple(GDROM_DEV_NAME, -1, NULL, 0);
+ if (IS_ERR(pd)) {
+ platform_driver_unregister(&gdrom_driver);
+ return PTR_ERR(pd);
+ }
+ return 0;
+}
+
+static void __exit exit_gdrom(void)
+{
+ platform_device_unregister(pd);
+ platform_driver_unregister(&gdrom_driver);
+ kfree(gd.toc);
+}
+
+module_init(init_gdrom);
+module_exit(exit_gdrom);
+MODULE_AUTHOR("Adrian McMenamin <[email protected]>");
+MODULE_DESCRIPTION("SEGA Dreamcast GD-ROM Driver");
+MODULE_LICENSE("GPL");
diff -rupN a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile
--- a/drivers/cdrom/Makefile 2008-01-14 22:32:26.000000000 +0000
+++ b/drivers/cdrom/Makefile 2008-01-14 22:35:39.000000000 +0000
@@ -11,3 +11,4 @@ obj-$(CONFIG_PARIDE_PCD) += cdrom.o
obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o
obj-$(CONFIG_VIOCD) += viocd.o cdrom.o
+obj-$(CONFIG_GDROM) += gdrom.o cdrom.o
On Thu, Jan 17, 2008 at 10:30:06PM +0000, Adrian McMenamin wrote:
> From: Adrian McMenamin <[email protected]>
>
> This patch adds support for the GD-Rom drive, SEGA's proprietary
> implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
> implements Sega's Packet Interface (SPI) - at least partially. It will
> also read disks in SEGA's propreitary GD format.
>
> Unlike previous drivers (which were never in mainline) this uses DMA and
> not PIO to read disks. It is a new driver, not a refactoring of old
> drivers.
>
> I hope I've fixed all the white space and other issues now!
>
> Signed-off by: Adrian McMenamin <[email protected]>
>
Looks good to me. I'll add it to my queue unless Andrew has any glaring
objections.
On Fri, 18 Jan 2008 09:56:33 +0900 Paul Mundt <[email protected]> wrote:
> On Thu, Jan 17, 2008 at 10:30:06PM +0000, Adrian McMenamin wrote:
> > From: Adrian McMenamin <[email protected]>
> >
> > This patch adds support for the GD-Rom drive, SEGA's proprietary
> > implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
> > implements Sega's Packet Interface (SPI) - at least partially. It will
> > also read disks in SEGA's propreitary GD format.
> >
> > Unlike previous drivers (which were never in mainline) this uses DMA and
> > not PIO to read disks. It is a new driver, not a refactoring of old
> > drivers.
> >
> > I hope I've fixed all the white space and other issues now!
> >
> > Signed-off by: Adrian McMenamin <[email protected]>
> >
> Looks good to me. I'll add it to my queue unless Andrew has any glaring
> objections.
Looks like a driver to me, but Jens is mostly-cdrom-maintainer.
On Sun, Jan 27, 2008 at 09:33:23PM -0800, Andrew Morton wrote:
> On Fri, 18 Jan 2008 09:56:33 +0900 Paul Mundt <[email protected]> wrote:
>
> > On Thu, Jan 17, 2008 at 10:30:06PM +0000, Adrian McMenamin wrote:
> > > From: Adrian McMenamin <[email protected]>
> > >
> > > This patch adds support for the GD-Rom drive, SEGA's proprietary
> > > implementation of an IDE CD Rom for the SEGA Dreamcast. This driver
> > > implements Sega's Packet Interface (SPI) - at least partially. It will
> > > also read disks in SEGA's propreitary GD format.
> > >
> > > Unlike previous drivers (which were never in mainline) this uses DMA and
> > > not PIO to read disks. It is a new driver, not a refactoring of old
> > > drivers.
> > >
> > > I hope I've fixed all the white space and other issues now!
> > >
> > > Signed-off by: Adrian McMenamin <[email protected]>
> > >
> > Looks good to me. I'll add it to my queue unless Andrew has any glaring
> > objections.
>
> Looks like a driver to me, but Jens is mostly-cdrom-maintainer.
Indeed, his Acked-by was already collected, so I've added it to my tree.