by Maxim Levitsky

[permalink] [raw]

Subject: [PATCH 9/9] mtd: add nand driver for ricoh xD/SmartMedia reader

>From b1150984957b7a2b429d40173891098a035c8947 Mon Sep 17 00:00:00 2001
From: Maxim Levitsky <[email protected]>
Date: Wed, 6 Jan 2010 23:06:28 +0200
Subject: [PATCH 9/9] mtd: add nand driver for ricoh xD/SmartMedia reader

---
MAINTAINERS | 6 +
drivers/mtd/nand/Kconfig | 11 +
drivers/mtd/nand/Makefile | 1 +
drivers/mtd/nand/r822.c | 1014 +++++++++++++++++++++++++++++++++++++++++++++
drivers/mtd/nand/r822.h | 155 +++++++
5 files changed, 1187 insertions(+), 0 deletions(-)
create mode 100644 drivers/mtd/nand/r822.c
create mode 100644 drivers/mtd/nand/r822.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 1c02e08..50a4006 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4466,6 +4466,12 @@ S: Maintained
F: Documentation/rfkill.txt
F: net/rfkill/

+RICOH SMARTMEDIA/XD DRIVER
+M: Maxim Levitsky <[email protected]>
+S: Maintained
+F: drivers/mtd/nand/r822.c
+F: drivers/mtd/nand/r822.h
+
RISCOM8 DRIVER
S: Orphan
F: Documentation/serial/riscom8.txt
diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
index 2fda0b6..c71e282 100644
--- a/drivers/mtd/nand/Kconfig
+++ b/drivers/mtd/nand/Kconfig
@@ -106,6 +106,17 @@ config MTD_NAND_TS7250
config MTD_NAND_IDS
tristate

+config MTD_NAND_RICOH
+ tristate "Ricoh xD card reader"
+ default n
+ select MTD_SM_COMMON
+ help
+ Enable support for Ricoh xD card reader
+ You also need to enable ether
+ NAND SSFDC (SmartMedia) read only translation layer' or new
+ expermental, readwrite
+ 'SmartMedia/xD new translation layer'
+
config MTD_NAND_AU1550
tristate "Au1550/1200 NAND support"
depends on SOC_AU1200 || SOC_AU1550
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
index 6950d3d..7b4f500 100644
--- a/drivers/mtd/nand/Makefile
+++ b/drivers/mtd/nand/Makefile
@@ -42,5 +42,6 @@ obj-$(CONFIG_MTD_NAND_SOCRATES) += socrates_nand.o
obj-$(CONFIG_MTD_NAND_TXX9NDFMC) += txx9ndfmc.o
obj-$(CONFIG_MTD_NAND_W90P910) += w90p910_nand.o
obj-$(CONFIG_MTD_NAND_NOMADIK) += nomadik_nand.o
+obj-$(CONFIG_MTD_NAND_RICOH) += r822.o

nand-objs := nand_base.o nand_bbt.o
diff --git a/drivers/mtd/nand/r822.c b/drivers/mtd/nand/r822.c
new file mode 100644
index 0000000..a5e9abc
--- /dev/null
+++ b/drivers/mtd/nand/r822.c
@@ -0,0 +1,1014 @@
+/*
+ * Copyright (C) 2009 - Maxim Levitsky
+ * driver for Ricoh xD readers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/jiffies.h>
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include <linux/pci_ids.h>
+#include <asm/byteorder.h>
+#include <linux/sched.h>
+#include "../sm_common.h"
+#include "r822.h"
+
+/* read register */
+static inline u8 r822_read_reg(struct r822_device *dev, int address)
+{
+ u8 reg = readb(dev->mmio + address);
+ return reg;
+}
+
+/* write register */
+static inline void r822_write_reg(struct r822_device *dev,
+ int address, u8 value)
+{
+ writeb(value, dev->mmio + address);
+}
+
+
+/* read dword sized register */
+static inline u32 r822_read_reg_dword(struct r822_device *dev, int address)
+{
+ u32 reg = le32_to_cpu(readl(dev->mmio + address));
+ return reg;
+}
+
+/* write dword sized register */
+static inline void r822_write_reg_dword(struct r822_device *dev,
+ int address, u32 value)
+{
+ writel(cpu_to_le32(value), dev->mmio + address);
+}
+
+/* returns pointer to our private structure */
+static inline struct r822_device *r822_get_dev(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = (struct nand_chip *)mtd->priv;
+ return (struct r822_device *)chip->priv;
+}
+
+
+/* check if controller supports dma */
+static void r822_dma_test(struct r822_device *dev)
+{
+ dev->dma_usable = (r822_read_reg(dev, R822_DMA_CAP) &
+ (R822_DMA1 | R822_DMA2)) == (R822_DMA1 | R822_DMA2);
+
+ if (!dev->dma_usable)
+ dbg("Non dma capable device detected, dma disabled");
+}
+
+/*
+ * Enable dma. Enables ether first or second stage of the DMA,
+ * Expects dev->dma_dir and dev->dma_state be set
+ */
+static void r822_dma_enable(struct r822_device *dev)
+{
+ u8 dma_reg = dev->dma_dir ? R822_DMA_READ : 0;
+
+ if (dev->dma_state == DMA_INTERNAL)
+ dma_reg |= R822_DMA_INTERNAL;
+ else {
+ dma_reg |= R822_DMA_MEMORY;
+ r822_write_reg_dword(dev, R822_DMA_ADDR,
+ cpu_to_le32(dev->phys_dma_addr));
+ }
+
+ r822_write_reg(dev, R822_DMA_IRQ_STA,
+ r822_read_reg(dev, R822_DMA_IRQ_STA));
+
+ r822_write_reg(dev, R822_DMA_SETTINGS, dma_reg);
+ r822_write_reg(dev, R822_DMA_IRQ_ENABLE,
+ R822_DMA_IRQ_INTERNAL |
+ R822_DMA_IRQ_ERROR |
+ R822_DMA_IRQ_MEMORY);
+}
+
+/*
+ * Disable dma, called from the interrupt handler, which specifies
+ * success of the operation via 'error' argument
+ */
+static void r822_dma_done(struct r822_device *dev, int error)
+{
+ WARN_ON(dev->dma_stage == 0);
+
+ if (error)
+ dbg("dma: complete with error");
+
+ r822_write_reg(dev, R822_DMA_IRQ_STA, r822_read_reg(dev, R822_DMA_IRQ_STA));
+ r822_write_reg(dev, R822_DMA_SETTINGS, 0);
+ r822_write_reg(dev, R822_DMA_IRQ_ENABLE, 0);
+
+ dev->dma_error = error;
+ dev->dma_stage = 0;
+
+ if(dev->phys_dma_addr && dev->phys_dma_addr != dev->phys_bounce_buffer)
+ pci_unmap_single(dev->pci_dev, dev->phys_dma_addr, R822_DMA_LEN,
+ dev->dma_dir ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE);
+ complete(&dev->dma_done);
+}
+
+/*
+ * Wait, till dma is done, which includes both phases of it
+ */
+static int r822_dma_wait(struct r822_device *dev)
+{
+ long timeout = wait_for_completion_interruptible_timeout(&dev->dma_done,
+ msecs_to_jiffies(1000));
+ if (timeout < 0)
+ return -EAGAIN;
+ if (!timeout)
+ return -ETIMEDOUT;
+ return 0;
+}
+
+/*
+ * Read/Write one page using dma. Only pages can be read (512 bytes), oob
+ * can't be read here
+*/
+static void r822_do_dma (struct r822_device *dev, uint8_t *buf, int do_read)
+{
+ int bounce = 0;
+ unsigned long flags;
+ int error;
+
+ dev->dma_error = 0;
+
+ /* Set dma direction */
+ dev->dma_dir = do_read;
+ dev->dma_stage = 1;
+
+ /* Set intial dma state: for reading first fill on board buffer,
+ from device, for writes first fill the buffer from memory*/
+ dev->dma_state = do_read ? DMA_INTERNAL : DMA_MEMORY;
+
+ /* if incoming buffer is not page aligned, we should do bounce */
+ if ((unsigned long)buf & (PAGE_SIZE-1))
+ bounce = 1;
+
+ if (!bounce) {
+ dev->phys_dma_addr = pci_map_single(dev->pci_dev, (void*)buf,
+ R822_DMA_LEN,
+ (do_read ? PCI_DMA_FROMDEVICE : PCI_DMA_TODEVICE));
+
+ if (dev->phys_dma_addr == bad_dma_address)
+ bounce = 1;
+ }
+
+ if (bounce) {
+ dev->phys_dma_addr = dev->phys_bounce_buffer;
+
+ if (!do_read)
+ memcpy(dev->bounce_buffer, buf, R822_DMA_LEN);
+ }
+
+ /* Enable DMA */
+ spin_lock_irqsave(&dev->irqlock, flags);
+ r822_dma_enable(dev);
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+
+ /* Wait till complete */
+ if((error = r822_dma_wait(dev))) {
+ r822_dma_done(dev, error);
+ return;
+ }
+
+ if(do_read && bounce)
+ memcpy((void*)buf, dev->bounce_buffer, R822_DMA_LEN);
+}
+
+/*
+ * Program data lines of the nand chip to send data to it
+ */
+void r822_write_buf (struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ u32 reg;
+
+ if (dev->card_unstable)
+ return;
+
+ /* special case for whole sector read */
+ if (len == R822_DMA_LEN && dev->dma_usable) {
+ r822_do_dma(dev, (uint8_t *)buf, 0);
+ return;
+ }
+
+ /* write DWORD chinks - faster */
+ while(len) {
+ reg = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
+ r822_write_reg_dword(dev, R822_DATALINE, reg);
+ buf += 4;
+ len -= 4;
+
+ if (len %16 == 0)
+ udelay(20);
+ }
+
+ /* write rest */
+ while (len)
+ r822_write_reg(dev, R822_DATALINE, *buf++);
+}
+
+/*
+ * Read data lines of the nand chip to retrieve data
+ */
+void r822_read_buf (struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ u32 reg;
+
+ if (dev->card_unstable)
+ return;
+
+ /* special case for whole sector read */
+ if (len == R822_DMA_LEN && dev->dma_usable) {
+ r822_do_dma(dev, buf, 1);
+ return;
+ }
+
+ /* read in dword sized chunks */
+ while(len >= 4) {
+
+ reg = r822_read_reg_dword(dev, R822_DATALINE);
+ *buf++ = reg & 0xFF;
+ *buf++ = (reg >> 8) & 0xFF;
+ *buf++ = (reg >> 16) & 0xFF;
+ *buf++ = (reg >> 24) & 0xFF;
+ len -= 4;
+ }
+
+ /* read the reset by bytes */
+ while(len--)
+ *buf++ = r822_read_reg (dev, R822_DATALINE);
+}
+
+static uint8_t r822_read_byte(struct mtd_info *mtd) {
+ struct r822_device *dev = r822_get_dev(mtd);
+ return r822_read_reg(dev, R822_DATALINE);
+}
+
+
+/*
+ * Readback the buffer to verify it
+ */
+int r822_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return 0;
+
+ if (len > SM_SECTOR_SIZE)
+ return 0;
+
+ r822_read_buf(mtd, dev->tmp_buffer, len);
+ return memcmp(buf, dev->tmp_buffer, len);
+}
+
+/*
+ * Control several chip lines & send commands
+ */
+void r822_cmdctl(struct mtd_info *mtd, int dat, unsigned int ctrl)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return;
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+
+ dev->ctlreg &= ~(R822_CTL_DATA | R822_CTL_COMMAND |
+ R822_CTL_ON | R822_CTL_CARDENABLE);
+
+ if (ctrl & NAND_ALE)
+ dev->ctlreg |= R822_CTL_DATA;
+
+ if (ctrl & NAND_CLE)
+ dev->ctlreg |= R822_CTL_COMMAND;
+
+ if (ctrl & NAND_NCE)
+ dev->ctlreg |= (R822_CTL_CARDENABLE | R822_CTL_ON);
+ else
+ dev->ctlreg &= ~R822_CTL_WRITE;
+
+ /* when write is stareted, enable write access */
+ if (dat == NAND_CMD_ERASE1)
+ dev->ctlreg |= R822_CTL_WRITE;
+
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ }
+
+
+ /* HACK: NAND_CMD_SEQIN is called without NAND_CTRL_CHANGE, but we need
+ to set write mode */
+ if (dat == NAND_CMD_SEQIN && (dev->ctlreg & R822_CTL_COMMAND)) {
+ dev->ctlreg |= R822_CTL_WRITE;
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ }
+
+ if (dat != NAND_CMD_NONE)
+ r822_write_reg(dev, R822_DATALINE, dat);
+}
+
+/*
+ * Wait till card is ready... This has to be a busy loop because
+ * 'our <censored> controller' doesn't have an interrupt for that...
+ * based on nand_wait
+ */
+int r822_wait(struct mtd_info *mtd, struct nand_chip *chip)
+{
+ struct r822_device *dev = (struct r822_device *)chip->priv;
+
+ unsigned long timeout;
+ int status;
+
+ timeout = jiffies + (chip->state == FL_ERASING ?
+ msecs_to_jiffies(400) : msecs_to_jiffies(20));
+
+ while (time_before(jiffies, timeout)) {
+ if (chip->dev_ready(mtd))
+ break;
+ cond_resched();
+ }
+
+ chip->cmdfunc(mtd, NAND_CMD_STATUS, -1, -1);
+ status = (int)chip->read_byte(mtd);
+
+ /* Unfortunelly, no way to send detailed error status... */
+ if (dev->dma_error) {
+ status |= NAND_STATUS_FAIL;
+ dev->dma_error = 0;
+ }
+
+ return status;
+}
+
+/*
+ * Check if card is ready
+ */
+
+int r822_ready(struct mtd_info *mtd)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ return !(r822_read_reg(dev, R822_CARD_STA) & R822_CARD_STA_BUSY);
+}
+
+
+/*
+ * Set ECC engine mode
+*/
+
+void r822_ecc_hwctl (struct mtd_info *mtd, int mode)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return;
+
+ switch(mode) {
+ case NAND_ECC_READ:
+ case NAND_ECC_WRITE:
+ /* enable ecc generation/check*/
+ dev->ctlreg |= R822_CTL_ECC_ENABLE;
+
+ /* flush ecc buffer */
+ r822_write_reg(dev, R822_CTL, dev->ctlreg | R822_CTL_ECC_ACCESS);
+ r822_read_reg(dev, R822_DATALINE);
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ return;
+
+ case NAND_ECC_READSYN:
+ /* disable ecc generation */
+ dev->ctlreg &= ~R822_CTL_ECC_ENABLE;
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ }
+}
+
+/*
+ * Calculate ECC, only used for writes
+ */
+
+int r822_ecc_calculate(struct mtd_info *mtd,const uint8_t *dat,
+ uint8_t *ecc_code)
+{
+ struct r822_device *dev = r822_get_dev(mtd);
+ struct sm_oob *oob = (struct sm_oob *)ecc_code;
+ u32 ecc1, ecc2;
+
+ if (dev->card_unstable)
+ return 0;
+
+ dev->ctlreg &= ~R822_CTL_ECC_ENABLE;
+ r822_write_reg(dev, R822_CTL, dev->ctlreg | R822_CTL_ECC_ACCESS);
+
+ ecc1 = r822_read_reg_dword(dev, R822_DATALINE);
+ ecc2 = r822_read_reg_dword(dev, R822_DATALINE);
+
+ oob->ecc1[0] = (ecc1) & 0xFF;
+ oob->ecc1[1] = (ecc1 >> 8) & 0xFF;
+ oob->ecc1[2] = (ecc1 >> 16) & 0xFF;
+
+ oob->ecc2[0] = (ecc2) & 0xFF;
+ oob->ecc2[1] = (ecc2 >> 8) & 0xFF;
+ oob->ecc2[2] = (ecc2 >> 16) & 0xFF;
+
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+ return 0;
+}
+
+/*
+ * Correct the data using ECC, hw did almost everything for us
+ */
+
+int r822_ecc_correct(struct mtd_info *mtd, uint8_t *dat,
+ uint8_t *read_ecc,uint8_t *calc_ecc)
+{
+ u16 ecc_reg;
+ u8 ecc_status, err_byte;
+ int i, error = 0;
+
+ struct r822_device *dev = r822_get_dev(mtd);
+
+ if (dev->card_unstable)
+ return 0;
+
+ r822_write_reg(dev, R822_CTL, dev->ctlreg | R822_CTL_ECC_ACCESS);
+ ecc_reg = r822_read_reg_dword(dev, R822_DATALINE);
+ r822_write_reg(dev, R822_CTL, dev->ctlreg);
+
+ for (i = 0 ; i <= 1 ; i++) {
+
+ ecc_status = (ecc_reg >> 8) & 0xFF;
+
+ /* ecc uncorrectable error */
+ if (ecc_status & R822_ECC_FAIL) {
+ dbg("ecc: unrecoverable error, in half %d", i);
+ error = -1;
+ goto exit;
+ }
+
+ /* correctable error */
+ if (ecc_status & R822_ECC_CORRECTABLE) {
+
+ err_byte = ecc_reg & 0xFF;
+
+ dbg("ecc: recoverable error, in half %d, byte %d, bit %d", i,
+ err_byte, ecc_status & R822_ECC_ERR_BIT_MSK);
+
+ dat[err_byte] ^= 1 << (ecc_status & R822_ECC_ERR_BIT_MSK);
+ error++;
+ }
+
+ dat += 256;
+ ecc_reg >>= 16;
+ }
+exit:
+ return error;
+}
+
+/*
+ * This is copy of nand_read_oob_std
+ * nand_read_oob_syndrome assumes we can send column address - we can't
+ */
+static int r822_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
+ int page, int sndcmd)
+{
+ if (sndcmd) {
+ chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
+ sndcmd = 0;
+ }
+ chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
+ return sndcmd;
+}
+
+/*
+ * Start the hardware
+ */
+
+void r822_device_start(struct r822_device *dev)
+{
+ if (r822_read_reg(dev, R822_HW) & R822_HW_UNKNOWN) {
+ dbg("r822_device_start: probably recovering from HW error");
+ r822_write_reg(dev, R822_CTL, R822_CTL_RESET | R822_CTL_ON);
+ r822_write_reg_dword(dev, R822_HW, R822_HW_ENABLED);
+ } else {
+ r822_write_reg(dev, R822_HW, R822_HW_ENABLED);
+ r822_write_reg(dev, R822_CTL, R822_CTL_RESET | R822_CTL_ON);
+ r822_write_reg(dev, R822_CTL, 0);
+ }
+ msleep(200);
+}
+
+
+/*
+ * Shutdown the hardware
+ */
+
+void r822_device_shutdown(struct r822_device *dev)
+{
+ r822_write_reg(dev, R822_HW, 0);
+ r822_write_reg(dev, R822_CTL, R822_CTL_RESET);
+}
+
+/*
+ * Test if card is present
+ */
+
+void r822_card_update_present(struct r822_device *dev)
+{
+ unsigned long flags;
+ u8 reg;
+
+ spin_lock_irqsave(&dev->irqlock, flags);
+ reg = r822_read_reg(dev, R822_CARD_STA);
+ dev->card_detected = !!(reg & R822_CARD_STA_PRESENT);
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+}
+
+/*
+ * Update card detection IRQ state according to current card state
+ * which is read in r822_card_update_present
+ */
+void r822_update_card_detect(struct r822_device *dev)
+{
+ int card_detect_reg = R822_CARD_IRQ_GENABLE;
+ card_detect_reg |= dev->card_detected ? R822_CARD_IRQ_REMOVE: R822_CARD_IRQ_INSERT;
+ r822_write_reg(dev, R822_CARD_IRQ_ENABLE, card_detect_reg);
+}
+
+
+/* Detect properties of card in slot */
+void r822_update_media_status(struct r822_device *dev)
+{
+ u8 reg;
+ unsigned long flags;
+ int readonly, sm;
+
+ spin_lock_irqsave(&dev->irqlock, flags);
+ if (!dev->card_detected) {
+ dbg("card removed");
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return ;
+ }
+
+ readonly = r822_read_reg(dev, R822_CARD_STA) & R822_CARD_STA_RO;
+ reg = r822_read_reg(dev, R822_DMA_CAP);
+ sm = (reg & (R822_DMA1 | R822_DMA2)) && (reg & R822_SMBIT);
+
+ dbg("detected %s %s card in slot",
+ sm ? "SmartMedia" : "xD",
+ readonly ? "readonly" : "writeable");
+
+ dev->readonly = readonly;
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+}
+
+/*
+ * Register the nand device
+ * Called when the card is detected
+ */
+int r822_register_nand_device(struct r822_device *dev)
+{
+ if (!(dev->mtd = kzalloc(sizeof(struct mtd_info), GFP_KERNEL)))
+ goto error1;
+
+ dev->mtd->owner = THIS_MODULE;
+ dev->mtd->priv = dev->chip;
+
+ if (dev->readonly)
+ dev->chip->options |= NAND_ROM;
+
+ r822_device_start(dev);
+ if (sm_register_device(dev->mtd))
+ goto error2;
+
+ dev->card_registred = 1;
+ return 0;
+error2:
+ kfree(dev->mtd);
+error1:
+ return -1;
+}
+
+/*
+ * Unregister the card
+ */
+
+void r822_unregister_nand_device(struct r822_device *dev)
+{
+ if (!dev->card_registred)
+ return;
+
+ nand_release(dev->mtd);
+ r822_device_shutdown(dev);
+ dev->card_registred = 0;
+ kfree(dev->mtd);
+ dev->mtd = NULL;
+}
+
+
+/* Card state updater */
+void r822_card_detect_work(struct work_struct *work)
+{
+ struct r822_device *dev =
+ container_of(work, struct r822_device, card_detect_work.work);
+
+ r822_card_update_present(dev);
+ dev->card_unstable = 0;
+
+ /* false alarm */
+ if (dev->card_detected == dev->card_registred) {
+ goto exit;
+ }
+
+ r822_update_media_status(dev);
+
+ /* no card present */
+ if (!dev->card_detected) {
+ r822_unregister_nand_device(dev);
+ goto exit;
+ }
+
+ /* card present from now */
+
+
+ if(!r822_register_nand_device(dev))
+ goto exit;
+ else
+ dev->card_detected = 0;
+exit:
+ r822_update_card_detect(dev);
+}
+
+
+/* disable IRQ generation */
+static void r822_disable_irqs(struct r822_device *dev)
+{
+ u8 reg;
+ reg = r822_read_reg(dev, R822_CARD_IRQ_ENABLE);
+ r822_write_reg(dev, R822_CARD_IRQ_ENABLE, reg & ~R822_CARD_IRQ_MASK);
+
+ reg = r822_read_reg(dev, R822_DMA_IRQ_ENABLE);
+ r822_write_reg(dev, R822_DMA_IRQ_ENABLE, reg & ~R822_DMA_IRQ_MASK);
+
+ reg = r822_read_reg(dev, R822_CARD_IRQ_STA);
+ r822_write_reg(dev, R822_CARD_IRQ_STA, reg);
+
+ reg = r822_read_reg(dev, R822_DMA_IRQ_STA);
+ r822_write_reg(dev, R822_DMA_IRQ_STA, reg);
+
+}
+
+/* Interrupt handler */
+static irqreturn_t r822_irq (int irq, void *data)
+{
+ struct r822_device *dev = (struct r822_device *)data;
+
+ u8 card_status, dma_status;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->irqlock, flags);
+
+ /* test card status interrupts */
+ card_status = r822_read_reg(dev, R822_CARD_IRQ_STA) & R822_CARD_IRQ_MASK;
+
+ if(card_status & (R822_CARD_IRQ_INSERT|R822_CARD_IRQ_REMOVE)) {
+
+ dev->card_detected = !!(card_status & R822_CARD_IRQ_INSERT);
+
+ /* we shouldn't recieve any interrupts if we wait for card
+ to settle */
+ WARN_ON(dev->card_unstable);
+
+ /* disable irqs while card is unstable */
+ /* this will timeout DMA if active, but better that garbage */
+ r822_disable_irqs(dev);
+
+ /* let, card state to settle a bit, and then do the work */
+ if(!dev->card_unstable) {
+ dev->card_unstable = 1;
+ queue_delayed_work(dev->card_workqueue,
+ &dev->card_detect_work, msecs_to_jiffies(100));
+ }
+
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+ }
+
+ card_status &= ~R822_CARD_IRQ_UNUSED1;
+ if (card_status)
+ dbg("card status = %02x", card_status);
+
+ /* test and ack dma interrupts */
+ dma_status = r822_read_reg(dev, R822_DMA_IRQ_STA) & R822_DMA_IRQ_MASK;
+ r822_write_reg(dev, R822_DMA_IRQ_STA, dma_status);
+
+ if(!dma_status) {
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_NONE;
+ }
+
+ if (dma_status & R822_DMA_IRQ_ERROR) {
+ dbg("recieved dma error IRQ");
+ r822_dma_done(dev, -EIO);
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+ }
+
+
+ /* recieved DMA interrupt out of nowhere? */
+ WARN_ON(dev->dma_stage == 0);
+
+
+ /* done device access */
+ if (dev->dma_state == DMA_INTERNAL && (dma_status & R822_DMA_IRQ_INTERNAL)) {
+ dev->dma_state = DMA_MEMORY;
+ dev->dma_stage++;
+ }
+
+ /* done memory DMA */
+ if (dev->dma_state == DMA_MEMORY && (dma_status & R822_DMA_IRQ_MEMORY)) {
+ dev->dma_state = DMA_INTERNAL;
+ dev->dma_stage++;
+ }
+
+ /* Enable 2nd half of dma dance */
+ if (dev->dma_stage == 2)
+ r822_dma_enable(dev);
+
+
+ /* Operation done */
+ if (dev->dma_stage == 3)
+ r822_dma_done(dev, 0);
+
+ spin_unlock_irqrestore(&dev->irqlock, flags);
+ return IRQ_HANDLED;
+}
+
+int r822_probe (struct pci_dev *pci_dev, const struct pci_device_id *id)
+{
+ int error;
+ struct nand_chip *chip;
+ struct r822_device *dev;
+
+ /* pci initialization */
+ if ((error = pci_enable_device(pci_dev)))
+ goto error1;
+
+ pci_set_master(pci_dev);
+
+ if ((error = pci_set_dma_mask(pci_dev, DMA_32BIT_MASK)))
+ goto error2;
+
+ if ((error = pci_request_regions(pci_dev, DRV_NAME)))
+ goto error3;
+
+ error = -ENOMEM;
+
+ /* init nand chip, but register it only on card insert */
+ if (!(chip = kzalloc(sizeof(struct nand_chip), GFP_KERNEL)))
+ goto error4;
+
+ /* commands */
+ chip->cmd_ctrl = r822_cmdctl;
+ chip->waitfunc = r822_wait;
+ chip->dev_ready = r822_ready;
+
+ /* I/O */
+ chip->read_byte = r822_read_byte;
+ chip->read_buf = r822_read_buf;
+ chip->write_buf = r822_write_buf;
+ chip->verify_buf = r822_verify_buf;
+
+ /* ecc */
+ chip->ecc.mode = NAND_ECC_HW_SYNDROME;
+ chip->ecc.size = R822_DMA_LEN;
+ chip->ecc.bytes = SM_OOB_SIZE;
+ chip->ecc.hwctl = r822_ecc_hwctl;
+ chip->ecc.calculate = r822_ecc_calculate;
+ chip->ecc.correct = r822_ecc_correct;
+
+ /* TODO: hack */
+ chip->ecc.read_oob = r822_read_oob;
+
+ /* init our device structure */
+ if (!(dev = kzalloc(sizeof(struct r822_device), GFP_KERNEL)))
+ goto error5;
+
+ chip->priv = dev;
+ dev->chip = chip;
+ dev->pci_dev = pci_dev;
+ pci_set_drvdata(pci_dev, dev);
+
+ dev->bounce_buffer = pci_alloc_consistent(pci_dev, R822_DMA_LEN,
+ &dev->phys_bounce_buffer);
+
+ if (!dev->bounce_buffer)
+ goto error6;
+
+ if (!(dev->mmio = pci_ioremap_bar (pci_dev, 0)))
+ goto error7;
+
+ if(!(dev->tmp_buffer = kzalloc(SM_SECTOR_SIZE, GFP_KERNEL)))
+ goto error8;
+
+ init_completion(&dev->dma_done);
+
+ if (!(dev->card_workqueue = create_freezeable_workqueue (DRV_NAME)))
+ goto error9;
+
+ INIT_DELAYED_WORK(&dev->card_detect_work, r822_card_detect_work);
+
+ /* shutdown everything - precation */
+ r822_device_shutdown(dev);
+ r822_disable_irqs(dev);
+ r822_dma_test(dev);
+
+ /*register irq handler*/
+ if (request_irq(pci_dev->irq, &r822_irq, IRQF_SHARED,
+ DRV_NAME, dev))
+ goto error10;
+
+ dev->irq = pci_dev->irq;
+ spin_lock_init(&dev->irqlock);
+
+ /* kick initial present test */
+ dev->card_detected = 0;
+ r822_card_update_present(dev);
+ queue_delayed_work(dev->card_workqueue,
+ &dev->card_detect_work, 0);
+
+ /* Load the FTL */
+ request_module_nowait("sm_ftl");
+
+ printk(KERN_NOTICE DRV_NAME ": driver loaded succesfully\n");
+ return 0;
+
+
+error10:
+ destroy_workqueue(dev->card_workqueue);
+error9:
+ kfree(dev->tmp_buffer);
+error8:
+ pci_iounmap(pci_dev, dev->mmio);
+
+error7:
+ pci_free_consistent(pci_dev, R822_DMA_LEN,
+ dev->bounce_buffer, dev->phys_bounce_buffer);
+error6:
+ kfree(dev);
+error5:
+ kfree(chip);
+error4:
+ pci_release_regions(pci_dev);
+error3:
+error2:
+ pci_disable_device(pci_dev);
+error1:
+ return error;
+}
+
+
+void r822_remove (struct pci_dev *pci_dev)
+{
+ struct r822_device *dev = pci_get_drvdata(pci_dev);
+
+ /* Stop detect workqueue - we are going to unregister the device anyway*/
+ cancel_delayed_work_sync(&dev->card_detect_work);
+ destroy_workqueue(dev->card_workqueue);
+
+ /* Unregister the device, this might make more IO */
+ r822_unregister_nand_device(dev);
+
+ /* Stop interrupts */
+ r822_disable_irqs(dev);
+ synchronize_irq(dev->irq);
+ free_irq(dev->irq, dev);
+
+ /* Cleanup */
+ kfree(dev->tmp_buffer);
+ pci_iounmap(pci_dev, dev->mmio);
+ pci_free_consistent(pci_dev, R822_DMA_LEN,
+ dev->bounce_buffer, dev->phys_bounce_buffer);
+ kfree(dev);
+ kfree(dev->chip);
+
+ /* Shutdown the PCI device */
+ pci_release_regions(pci_dev);
+ pci_disable_device(pci_dev);
+}
+
+void r822_shutdown (struct pci_dev *pci_dev)
+{
+ struct r822_device *dev = pci_get_drvdata(pci_dev);
+
+ cancel_delayed_work_sync(&dev->card_detect_work);
+ r822_disable_irqs(dev);
+ pci_disable_device(pci_dev);
+}
+
+int r822_suspend (struct device *device)
+{
+ struct r822_device *dev = pci_get_drvdata(to_pci_dev(device));
+
+ if (dev->ctlreg & R822_CTL_CARDENABLE)
+ return -EBUSY;
+
+ cancel_delayed_work_sync(&dev->card_detect_work);
+ r822_disable_irqs(dev);
+ r822_device_shutdown(dev);
+
+ /* If card was pulled off just during the suspend, which is very
+ unlikely, we will remove it on resume, it too late now
+ anyway... */
+ dev->card_unstable = 0;
+
+ pci_save_state(to_pci_dev(device));
+ pci_set_power_state(to_pci_dev(device), PCI_D3cold);
+
+
+ return 0;
+}
+
+int r822_resume (struct device *device)
+{
+ struct r822_device *dev = pci_get_drvdata(to_pci_dev(device));
+
+ pci_set_power_state(to_pci_dev(device), PCI_D0);
+ pci_restore_state(to_pci_dev(device));
+
+
+ r822_disable_irqs(dev);
+ r822_card_update_present(dev);
+ r822_device_shutdown(dev);
+
+
+ /* If card status changed, just do the work */
+ if (dev->card_detected != dev->card_registred) {
+ dbg("card was %s during low power state",
+ dev->card_detected ? "added" : "removed");
+
+ queue_delayed_work(dev->card_workqueue,
+ &dev->card_detect_work, 0);
+ return 0;
+ }
+
+ /* Otherwise, initialize the card */
+ if (dev->card_registred) {
+ r822_device_start(dev);
+ dev->chip->select_chip(dev->mtd, 0);
+ dev->chip->cmdfunc(dev->mtd, NAND_CMD_RESET, -1, -1);
+ dev->chip->cmdfunc(dev->mtd, NAND_CMD_READ0, -1, -1);
+ dev->chip->select_chip(dev->mtd, -1);
+ }
+
+ /* And start card detection IRQ */
+ r822_update_card_detect(dev);
+
+ return 0;
+}
+
+static const struct pci_device_id r822_pci_id_tbl[] = {
+
+ { PCI_VDEVICE(RICOH, PCI_DEVICE_ID_RICOH_RL5C852), },
+ { },
+};
+
+MODULE_DEVICE_TABLE(pci, r822_pci_id_tbl);
+
+SIMPLE_DEV_PM_OPS(r822_pm_ops, r822_suspend, r822_resume);
+
+
+static struct pci_driver r822_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = r822_pci_id_tbl,
+ .probe = r822_probe,
+ .remove = r822_remove,
+ .shutdown = r822_shutdown,
+ .driver.pm = &r822_pm_ops,
+};
+
+static __init int r822_module_init(void)
+{
+ return pci_register_driver(&r822_pci_driver);
+}
+
+static void __exit r822_module_exit(void)
+{
+ pci_unregister_driver(&r822_pci_driver);
+}
+
+module_init(r822_module_init);
+module_exit(r822_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Maxim Levitsky <[email protected]>");
+MODULE_DESCRIPTION("Ricoh 85xx xD/smartmedia card reader driver");
diff --git a/drivers/mtd/nand/r822.h b/drivers/mtd/nand/r822.h
new file mode 100644
index 0000000..5b69629
--- /dev/null
+++ b/drivers/mtd/nand/r822.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2009 - Maxim Levitsky
+ * driver for Ricoh xD readers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/pci.h>
+#include <linux/completion.h>
+#include <linux/workqueue.h>
+#include <linux/mtd/nand.h>
+#include <linux/spinlock.h>
+
+
+/* nand interface + ecc
+ byte write/read does one cycle on nand data lines.
+ dword write/read does 4 cycles
+ if R822_CTL_ECC_ACCESS is set in R822_CTL, then dword read reads
+ results of ecc correction, if DMA read was done before.
+ If write was done two dword reads read generated ecc checksums
+*/
+#define R822_DATALINE 0x00
+
+/* control register */
+#define R822_CTL 0x04
+#define R822_CTL_COMMAND 0x01 /* send command (#CLE)*/
+#define R822_CTL_DATA 0x02 /* read/write data (#ALE)*/
+#define R822_CTL_ON 0x04 /* only seem to controls the hd led, */
+ /* but has to be set on start...*/
+#define R822_CTL_RESET 0x08 /* unknown, set only on start once*/
+#define R822_CTL_CARDENABLE 0x10 /* probably (#CE) - always set*/
+#define R822_CTL_ECC_ENABLE 0x20 /* enable ecc engine */
+#define R822_CTL_ECC_ACCESS 0x40 /* read/write ecc via reg #0*/
+#define R822_CTL_WRITE 0x80 /* set when performing writes (#WP) */
+
+
+/* card detection status */
+#define R822_CARD_STA 0x05
+#define R822_CARD_STA_UNUSED1 0x01 /* unknown */
+#define R822_CARD_STA_RO 0x02 /* card is readonly -- test on #WP???*/
+#define R822_CARD_STA_PRESENT 0x04 /* card is present (#CD) */
+#define R822_CARD_STA_BUSY 0x80 /* card is busy - (#R/B) */
+
+/* card detection irq status*/
+#define R822_CARD_IRQ_STA 0x06 /* IRQ status */
+
+/* card detection irq enable */
+#define R822_CARD_IRQ_ENABLE 0x07 /* IRQ enable */
+
+#define R822_CARD_IRQ_UNUSED1 0x01 /* unknown */
+#define R822_CARD_IRQ_REMOVE 0x04 /* detect card removal */
+#define R822_CARD_IRQ_INSERT 0x08 /* detect card insert */
+#define R822_CARD_IRQ_UNUSED2 0x10 /* unknown */
+#define R822_CARD_IRQ_GENABLE 0x80 /* general enable */
+#define R822_CARD_IRQ_MASK 0x1D
+
+
+/* hardware enable */
+#define R822_HW 0x08
+#define R822_HW_ENABLED 0x01 /* hw enabled */
+#define R822_HW_UNKNOWN 0x80
+
+
+/* dma capabilities */
+#define R822_DMA_CAP 0x09
+#define R822_SMBIT 0x20 /* if set with bit #6 or bit #7, then */
+ /* hw is smartmedia */
+#define R822_DMA1 0x40 /* if set with bit #7, dma is supported */
+#define R822_DMA2 0x80 /* if set with bit #6, dma is supported */
+
+
+/* physical DMA address - 32 bit value*/
+#define R822_DMA_ADDR 0x0C
+
+
+/* dma settings */
+#define R822_DMA_SETTINGS 0x10
+#define R822_DMA_MEMORY 0x01 /* do real dma (memory <-> internal hw buffer) */
+#define R822_DMA_READ 0x02 /* 0 = write, 1 = read */
+#define R822_DMA_INTERNAL 0x04 /* transfer internal buffer from/to card */
+
+/* dma IRQ status */
+#define R822_DMA_IRQ_STA 0x14
+
+/* dma IRQ enable */
+#define R822_DMA_IRQ_ENABLE 0x18
+
+#define R822_DMA_IRQ_MEMORY 0x01 /* real dma done (memory <-> internal hw buffer) */
+#define R822_DMA_IRQ_ERROR 0x02 /* error did happen */
+#define R822_DMA_IRQ_INTERNAL 0x04 /* internal buffer was tranferred from/to card*/
+#define R822_DMA_IRQ_MASK 0x07 /* mask of all IRQ bits*/
+
+
+/* ECC syndrome format - read from reg #0 will return two copies of these for
+ each half of the page.
+ first byte is error byte location, and second, bit location + flags */
+#define R822_ECC_ERR_BIT_MSK 0x07 /* error bit location */
+#define R822_ECC_CORRECT 0x10 /* no errors - (guessed) */
+#define R822_ECC_CORRECTABLE 0x20 /* correctable error exist */
+#define R822_ECC_FAIL 0x40 /* non correctable error detected */
+
+#define R822_DMA_LEN 512
+
+#define DMA_INTERNAL 0
+#define DMA_MEMORY 1
+
+struct r822_device {
+ void __iomem *mmio; /* mmio */
+ struct mtd_info *mtd; /* mtd backpointer */
+ struct nand_chip *chip; /* nand chip backpointer */
+ struct pci_dev *pci_dev; /* pci backpointer */
+
+ /* dma area */
+ dma_addr_t phys_dma_addr; /* bus address of buffer*/
+ struct completion dma_done; /* data transfer done */
+
+ dma_addr_t phys_bounce_buffer; /* bus address of bounce buffer */
+ u8 *bounce_buffer; /* virtual address of bounce buffer */
+
+ int dma_dir; /* 1 = read, 0 = write */
+ int dma_stage; /* 0 - idle, 1 - first step,
+ 2 - second step */
+
+ int dma_state; /* 0 = internal, 1 = memory */
+ int dma_error; /* dma errors */
+ int dma_usable; /* is it possible to use dma */
+
+
+ /* card status area */
+ struct delayed_work card_detect_work;
+ struct workqueue_struct* card_workqueue;
+ int card_registred; /* card registered with mtd */
+ int card_detected; /* card detected in slot */
+ int card_unstable; /* whenever the card is inserted,
+ is not known yet */
+ int readonly; /* card is readonly */
+
+ /* misc */
+ spinlock_t irqlock; /* IRQ protecting lock */
+ void *tmp_buffer; /* temporary buffer */
+ u8 ctlreg; /* cached contents of control reg */
+ int irq; /* irq num */
+};
+
+#define DRV_NAME "r822xd"
+
+
+/* this will go to pci_ids.h */
+#define PCI_DEVICE_ID_RICOH_RL5C852 0x0852
+
+
+#define dbg(format, ...) \
+ printk (KERN_ERR DRV_NAME ": " format "\n", ## __VA_ARGS__)
--
1.6.3.3