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Date:   Mon, 22 Mar 2021 17:04:36 -0700
From:   Davidlohr Bueso <dave@stgolabs.net>
To:     Michal Simek <michal.simek@xilinx.com>
Cc:     linux-kernel@vger.kernel.org, monstr@monstr.eu, git@xilinx.com,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Chris Packham <chris.packham@alliedtelesis.co.nz>,
        Jens Axboe <axboe@kernel.dk>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Paul Mackerras <paulus@samba.org>,
        Rob Herring <robh+dt@kernel.org>,
        YueHaibing <yuehaibing@huawei.com>, devicetree@vger.kernel.org,
        linux-block@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] xsysace: Remove SYSACE driver
Message-ID: <20210323000436.qm5rkiplwt5x5ttk@offworld>
References: <ee1fe969905f641f5f97d812ee0cac44c12fe0f6.1604919578.git.michal.simek@xilinx.com>
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In-Reply-To: <ee1fe969905f641f5f97d812ee0cac44c12fe0f6.1604919578.git.michal.simek@xilinx.com>
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Hi,

On Mon, 09 Nov 2020, Michal Simek wrote:

>Sysace IP is no longer used on Xilinx PowerPC 405/440 and Microblaze
>systems. The driver is not regularly tested and very likely not working for
>quite a long time that's why remove it.

Is there a reason this patch was never merged? can the driver be removed? I ran
into this as a potential tasklet user that can be replaced/removed.

Thanks,
Davidlohr

>
>Signed-off-by: Michal Simek <michal.simek@xilinx.com>
>---
>
>Based on discussion
>https://lore.kernel.org/linux-arm-kernel/5ab9a2a1-20e3-c7b2-f666-2034df436e74@kernel.dk/
>
>I have grepped the kernel and found any old ppc platform. I have included
>it in this patch to have a discussion about it.
>
>---
> MAINTAINERS                             |    1 -
> arch/microblaze/boot/dts/system.dts     |    8 -
> arch/powerpc/boot/dts/icon.dts          |    7 -
> arch/powerpc/configs/44x/icon_defconfig |    1 -
> drivers/block/Kconfig                   |    6 -
> drivers/block/Makefile                  |    1 -
> drivers/block/xsysace.c                 | 1273 -----------------------
> 7 files changed, 1297 deletions(-)
> delete mode 100644 drivers/block/xsysace.c
>
>diff --git a/MAINTAINERS b/MAINTAINERS
>index cba8ddf87a08..38556c009758 100644
>--- a/MAINTAINERS
>+++ b/MAINTAINERS
>@@ -2741,7 +2741,6 @@ T:	git https://github.com/Xilinx/linux-xlnx.git
> F:	Documentation/devicetree/bindings/i2c/cdns,i2c-r1p10.yaml
> F:	Documentation/devicetree/bindings/i2c/xlnx,xps-iic-2.00.a.yaml
> F:	arch/arm/mach-zynq/
>-F:	drivers/block/xsysace.c
> F:	drivers/clocksource/timer-cadence-ttc.c
> F:	drivers/cpuidle/cpuidle-zynq.c
> F:	drivers/edac/synopsys_edac.c
>diff --git a/arch/microblaze/boot/dts/system.dts b/arch/microblaze/boot/dts/system.dts
>index 5b236527176e..b7ee1056779e 100644
>--- a/arch/microblaze/boot/dts/system.dts
>+++ b/arch/microblaze/boot/dts/system.dts
>@@ -310,14 +310,6 @@ RS232_Uart_1: serial@84000000 {
> 			xlnx,odd-parity = <0x0>;
> 			xlnx,use-parity = <0x0>;
> 		} ;
>-		SysACE_CompactFlash: sysace@83600000 {
>-			compatible = "xlnx,xps-sysace-1.00.a";
>-			interrupt-parent = <&xps_intc_0>;
>-			interrupts = < 4 2 >;
>-			reg = < 0x83600000 0x10000 >;
>-			xlnx,family = "virtex5";
>-			xlnx,mem-width = <0x10>;
>-		} ;
> 		debug_module: debug@84400000 {
> 			compatible = "xlnx,mdm-1.00.d";
> 			reg = < 0x84400000 0x10000 >;
>diff --git a/arch/powerpc/boot/dts/icon.dts b/arch/powerpc/boot/dts/icon.dts
>index fbaa60b8f87a..4fd7a4fbb4fb 100644
>--- a/arch/powerpc/boot/dts/icon.dts
>+++ b/arch/powerpc/boot/dts/icon.dts
>@@ -197,13 +197,6 @@ partition@fa0000 {
> 						reg = <0x00fa0000 0x00060000>;
> 					};
> 				};
>-
>-				SysACE_CompactFlash: sysace@1,0 {
>-					compatible = "xlnx,sysace";
>-					interrupt-parent = <&UIC2>;
>-					interrupts = <24 0x4>;
>-					reg = <0x00000001 0x00000000 0x10000>;
>-				};
> 			};
>
> 			UART0: serial@f0000200 {
>diff --git a/arch/powerpc/configs/44x/icon_defconfig b/arch/powerpc/configs/44x/icon_defconfig
>index 930948a1da76..fb9a15573546 100644
>--- a/arch/powerpc/configs/44x/icon_defconfig
>+++ b/arch/powerpc/configs/44x/icon_defconfig
>@@ -28,7 +28,6 @@ CONFIG_MTD_CFI_AMDSTD=y
> CONFIG_MTD_PHYSMAP_OF=y
> CONFIG_BLK_DEV_RAM=y
> CONFIG_BLK_DEV_RAM_SIZE=35000
>-CONFIG_XILINX_SYSACE=y
> CONFIG_SCSI=y
> CONFIG_BLK_DEV_SD=y
> CONFIG_SCSI_CONSTANTS=y
>diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
>index ecceaaa1a66f..9cb02861298d 100644
>--- a/drivers/block/Kconfig
>+++ b/drivers/block/Kconfig
>@@ -388,12 +388,6 @@ config SUNVDC
>
> source "drivers/s390/block/Kconfig"
>
>-config XILINX_SYSACE
>-	tristate "Xilinx SystemACE support"
>-	depends on 4xx || MICROBLAZE
>-	help
>-	  Include support for the Xilinx SystemACE CompactFlash interface
>-
> config XEN_BLKDEV_FRONTEND
> 	tristate "Xen virtual block device support"
> 	depends on XEN
>diff --git a/drivers/block/Makefile b/drivers/block/Makefile
>index e1f63117ee94..5ddd9370972a 100644
>--- a/drivers/block/Makefile
>+++ b/drivers/block/Makefile
>@@ -19,7 +19,6 @@ obj-$(CONFIG_ATARI_FLOPPY)	+= ataflop.o
> obj-$(CONFIG_AMIGA_Z2RAM)	+= z2ram.o
> obj-$(CONFIG_BLK_DEV_RAM)	+= brd.o
> obj-$(CONFIG_BLK_DEV_LOOP)	+= loop.o
>-obj-$(CONFIG_XILINX_SYSACE)	+= xsysace.o
> obj-$(CONFIG_CDROM_PKTCDVD)	+= pktcdvd.o
> obj-$(CONFIG_SUNVDC)		+= sunvdc.o
> obj-$(CONFIG_BLK_DEV_SKD)	+= skd.o
>diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
>deleted file mode 100644
>index eb8ef65778c3..000000000000
>--- a/drivers/block/xsysace.c
>+++ /dev/null
>@@ -1,1273 +0,0 @@
>-// SPDX-License-Identifier: GPL-2.0-only
>-/*
>- * Xilinx SystemACE device driver
>- *
>- * Copyright 2007 Secret Lab Technologies Ltd.
>- */
>-
>-/*
>- * The SystemACE chip is designed to configure FPGAs by loading an FPGA
>- * bitstream from a file on a CF card and squirting it into FPGAs connected
>- * to the SystemACE JTAG chain.  It also has the advantage of providing an
>- * MPU interface which can be used to control the FPGA configuration process
>- * and to use the attached CF card for general purpose storage.
>- *
>- * This driver is a block device driver for the SystemACE.
>- *
>- * Initialization:
>- *    The driver registers itself as a platform_device driver at module
>- *    load time.  The platform bus will take care of calling the
>- *    ace_probe() method for all SystemACE instances in the system.  Any
>- *    number of SystemACE instances are supported.  ace_probe() calls
>- *    ace_setup() which initialized all data structures, reads the CF
>- *    id structure and registers the device.
>- *
>- * Processing:
>- *    Just about all of the heavy lifting in this driver is performed by
>- *    a Finite State Machine (FSM).  The driver needs to wait on a number
>- *    of events; some raised by interrupts, some which need to be polled
>- *    for.  Describing all of the behaviour in a FSM seems to be the
>- *    easiest way to keep the complexity low and make it easy to
>- *    understand what the driver is doing.  If the block ops or the
>- *    request function need to interact with the hardware, then they
>- *    simply need to flag the request and kick of FSM processing.
>- *
>- *    The FSM itself is atomic-safe code which can be run from any
>- *    context.  The general process flow is:
>- *    1. obtain the ace->lock spinlock.
>- *    2. loop on ace_fsm_dostate() until the ace->fsm_continue flag is
>- *       cleared.
>- *    3. release the lock.
>- *
>- *    Individual states do not sleep in any way.  If a condition needs to
>- *    be waited for then the state much clear the fsm_continue flag and
>- *    either schedule the FSM to be run again at a later time, or expect
>- *    an interrupt to call the FSM when the desired condition is met.
>- *
>- *    In normal operation, the FSM is processed at interrupt context
>- *    either when the driver's tasklet is scheduled, or when an irq is
>- *    raised by the hardware.  The tasklet can be scheduled at any time.
>- *    The request method in particular schedules the tasklet when a new
>- *    request has been indicated by the block layer.  Once started, the
>- *    FSM proceeds as far as it can processing the request until it
>- *    needs on a hardware event.  At this point, it must yield execution.
>- *
>- *    A state has two options when yielding execution:
>- *    1. ace_fsm_yield()
>- *       - Call if need to poll for event.
>- *       - clears the fsm_continue flag to exit the processing loop
>- *       - reschedules the tasklet to run again as soon as possible
>- *    2. ace_fsm_yieldirq()
>- *       - Call if an irq is expected from the HW
>- *       - clears the fsm_continue flag to exit the processing loop
>- *       - does not reschedule the tasklet so the FSM will not be processed
>- *         again until an irq is received.
>- *    After calling a yield function, the state must return control back
>- *    to the FSM main loop.
>- *
>- *    Additionally, the driver maintains a kernel timer which can process
>- *    the FSM.  If the FSM gets stalled, typically due to a missed
>- *    interrupt, then the kernel timer will expire and the driver can
>- *    continue where it left off.
>- *
>- * To Do:
>- *    - Add FPGA configuration control interface.
>- *    - Request major number from lanana
>- */
>-
>-#undef DEBUG
>-
>-#include <linux/module.h>
>-#include <linux/ctype.h>
>-#include <linux/init.h>
>-#include <linux/interrupt.h>
>-#include <linux/errno.h>
>-#include <linux/kernel.h>
>-#include <linux/delay.h>
>-#include <linux/slab.h>
>-#include <linux/blk-mq.h>
>-#include <linux/mutex.h>
>-#include <linux/ata.h>
>-#include <linux/hdreg.h>
>-#include <linux/platform_device.h>
>-#if defined(CONFIG_OF)
>-#include <linux/of_address.h>
>-#include <linux/of_device.h>
>-#include <linux/of_platform.h>
>-#endif
>-
>-MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
>-MODULE_DESCRIPTION("Xilinx SystemACE device driver");
>-MODULE_LICENSE("GPL");
>-
>-/* SystemACE register definitions */
>-#define ACE_BUSMODE (0x00)
>-
>-#define ACE_STATUS (0x04)
>-#define ACE_STATUS_CFGLOCK      (0x00000001)
>-#define ACE_STATUS_MPULOCK      (0x00000002)
>-#define ACE_STATUS_CFGERROR     (0x00000004)	/* config controller error */
>-#define ACE_STATUS_CFCERROR     (0x00000008)	/* CF controller error */
>-#define ACE_STATUS_CFDETECT     (0x00000010)
>-#define ACE_STATUS_DATABUFRDY   (0x00000020)
>-#define ACE_STATUS_DATABUFMODE  (0x00000040)
>-#define ACE_STATUS_CFGDONE      (0x00000080)
>-#define ACE_STATUS_RDYFORCFCMD  (0x00000100)
>-#define ACE_STATUS_CFGMODEPIN   (0x00000200)
>-#define ACE_STATUS_CFGADDR_MASK (0x0000e000)
>-#define ACE_STATUS_CFBSY        (0x00020000)
>-#define ACE_STATUS_CFRDY        (0x00040000)
>-#define ACE_STATUS_CFDWF        (0x00080000)
>-#define ACE_STATUS_CFDSC        (0x00100000)
>-#define ACE_STATUS_CFDRQ        (0x00200000)
>-#define ACE_STATUS_CFCORR       (0x00400000)
>-#define ACE_STATUS_CFERR        (0x00800000)
>-
>-#define ACE_ERROR (0x08)
>-#define ACE_CFGLBA (0x0c)
>-#define ACE_MPULBA (0x10)
>-
>-#define ACE_SECCNTCMD (0x14)
>-#define ACE_SECCNTCMD_RESET      (0x0100)
>-#define ACE_SECCNTCMD_IDENTIFY   (0x0200)
>-#define ACE_SECCNTCMD_READ_DATA  (0x0300)
>-#define ACE_SECCNTCMD_WRITE_DATA (0x0400)
>-#define ACE_SECCNTCMD_ABORT      (0x0600)
>-
>-#define ACE_VERSION (0x16)
>-#define ACE_VERSION_REVISION_MASK (0x00FF)
>-#define ACE_VERSION_MINOR_MASK    (0x0F00)
>-#define ACE_VERSION_MAJOR_MASK    (0xF000)
>-
>-#define ACE_CTRL (0x18)
>-#define ACE_CTRL_FORCELOCKREQ   (0x0001)
>-#define ACE_CTRL_LOCKREQ        (0x0002)
>-#define ACE_CTRL_FORCECFGADDR   (0x0004)
>-#define ACE_CTRL_FORCECFGMODE   (0x0008)
>-#define ACE_CTRL_CFGMODE        (0x0010)
>-#define ACE_CTRL_CFGSTART       (0x0020)
>-#define ACE_CTRL_CFGSEL         (0x0040)
>-#define ACE_CTRL_CFGRESET       (0x0080)
>-#define ACE_CTRL_DATABUFRDYIRQ  (0x0100)
>-#define ACE_CTRL_ERRORIRQ       (0x0200)
>-#define ACE_CTRL_CFGDONEIRQ     (0x0400)
>-#define ACE_CTRL_RESETIRQ       (0x0800)
>-#define ACE_CTRL_CFGPROG        (0x1000)
>-#define ACE_CTRL_CFGADDR_MASK   (0xe000)
>-
>-#define ACE_FATSTAT (0x1c)
>-
>-#define ACE_NUM_MINORS 16
>-#define ACE_SECTOR_SIZE (512)
>-#define ACE_FIFO_SIZE (32)
>-#define ACE_BUF_PER_SECTOR (ACE_SECTOR_SIZE / ACE_FIFO_SIZE)
>-
>-#define ACE_BUS_WIDTH_8  0
>-#define ACE_BUS_WIDTH_16 1
>-
>-struct ace_reg_ops;
>-
>-struct ace_device {
>-	/* driver state data */
>-	int id;
>-	int media_change;
>-	int users;
>-	struct list_head list;
>-
>-	/* finite state machine data */
>-	struct tasklet_struct fsm_tasklet;
>-	uint fsm_task;		/* Current activity (ACE_TASK_*) */
>-	uint fsm_state;		/* Current state (ACE_FSM_STATE_*) */
>-	uint fsm_continue_flag;	/* cleared to exit FSM mainloop */
>-	uint fsm_iter_num;
>-	struct timer_list stall_timer;
>-
>-	/* Transfer state/result, use for both id and block request */
>-	struct request *req;	/* request being processed */
>-	void *data_ptr;		/* pointer to I/O buffer */
>-	int data_count;		/* number of buffers remaining */
>-	int data_result;	/* Result of transfer; 0 := success */
>-
>-	int id_req_count;	/* count of id requests */
>-	int id_result;
>-	struct completion id_completion;	/* used when id req finishes */
>-	int in_irq;
>-
>-	/* Details of hardware device */
>-	resource_size_t physaddr;
>-	void __iomem *baseaddr;
>-	int irq;
>-	int bus_width;		/* 0 := 8 bit; 1 := 16 bit */
>-	struct ace_reg_ops *reg_ops;
>-	int lock_count;
>-
>-	/* Block device data structures */
>-	spinlock_t lock;
>-	struct device *dev;
>-	struct request_queue *queue;
>-	struct gendisk *gd;
>-	struct blk_mq_tag_set tag_set;
>-	struct list_head rq_list;
>-
>-	/* Inserted CF card parameters */
>-	u16 cf_id[ATA_ID_WORDS];
>-};
>-
>-static DEFINE_MUTEX(xsysace_mutex);
>-static int ace_major;
>-
>-/* ---------------------------------------------------------------------
>- * Low level register access
>- */
>-
>-struct ace_reg_ops {
>-	u16(*in) (struct ace_device * ace, int reg);
>-	void (*out) (struct ace_device * ace, int reg, u16 val);
>-	void (*datain) (struct ace_device * ace);
>-	void (*dataout) (struct ace_device * ace);
>-};
>-
>-/* 8 Bit bus width */
>-static u16 ace_in_8(struct ace_device *ace, int reg)
>-{
>-	void __iomem *r = ace->baseaddr + reg;
>-	return in_8(r) | (in_8(r + 1) << 8);
>-}
>-
>-static void ace_out_8(struct ace_device *ace, int reg, u16 val)
>-{
>-	void __iomem *r = ace->baseaddr + reg;
>-	out_8(r, val);
>-	out_8(r + 1, val >> 8);
>-}
>-
>-static void ace_datain_8(struct ace_device *ace)
>-{
>-	void __iomem *r = ace->baseaddr + 0x40;
>-	u8 *dst = ace->data_ptr;
>-	int i = ACE_FIFO_SIZE;
>-	while (i--)
>-		*dst++ = in_8(r++);
>-	ace->data_ptr = dst;
>-}
>-
>-static void ace_dataout_8(struct ace_device *ace)
>-{
>-	void __iomem *r = ace->baseaddr + 0x40;
>-	u8 *src = ace->data_ptr;
>-	int i = ACE_FIFO_SIZE;
>-	while (i--)
>-		out_8(r++, *src++);
>-	ace->data_ptr = src;
>-}
>-
>-static struct ace_reg_ops ace_reg_8_ops = {
>-	.in = ace_in_8,
>-	.out = ace_out_8,
>-	.datain = ace_datain_8,
>-	.dataout = ace_dataout_8,
>-};
>-
>-/* 16 bit big endian bus attachment */
>-static u16 ace_in_be16(struct ace_device *ace, int reg)
>-{
>-	return in_be16(ace->baseaddr + reg);
>-}
>-
>-static void ace_out_be16(struct ace_device *ace, int reg, u16 val)
>-{
>-	out_be16(ace->baseaddr + reg, val);
>-}
>-
>-static void ace_datain_be16(struct ace_device *ace)
>-{
>-	int i = ACE_FIFO_SIZE / 2;
>-	u16 *dst = ace->data_ptr;
>-	while (i--)
>-		*dst++ = in_le16(ace->baseaddr + 0x40);
>-	ace->data_ptr = dst;
>-}
>-
>-static void ace_dataout_be16(struct ace_device *ace)
>-{
>-	int i = ACE_FIFO_SIZE / 2;
>-	u16 *src = ace->data_ptr;
>-	while (i--)
>-		out_le16(ace->baseaddr + 0x40, *src++);
>-	ace->data_ptr = src;
>-}
>-
>-/* 16 bit little endian bus attachment */
>-static u16 ace_in_le16(struct ace_device *ace, int reg)
>-{
>-	return in_le16(ace->baseaddr + reg);
>-}
>-
>-static void ace_out_le16(struct ace_device *ace, int reg, u16 val)
>-{
>-	out_le16(ace->baseaddr + reg, val);
>-}
>-
>-static void ace_datain_le16(struct ace_device *ace)
>-{
>-	int i = ACE_FIFO_SIZE / 2;
>-	u16 *dst = ace->data_ptr;
>-	while (i--)
>-		*dst++ = in_be16(ace->baseaddr + 0x40);
>-	ace->data_ptr = dst;
>-}
>-
>-static void ace_dataout_le16(struct ace_device *ace)
>-{
>-	int i = ACE_FIFO_SIZE / 2;
>-	u16 *src = ace->data_ptr;
>-	while (i--)
>-		out_be16(ace->baseaddr + 0x40, *src++);
>-	ace->data_ptr = src;
>-}
>-
>-static struct ace_reg_ops ace_reg_be16_ops = {
>-	.in = ace_in_be16,
>-	.out = ace_out_be16,
>-	.datain = ace_datain_be16,
>-	.dataout = ace_dataout_be16,
>-};
>-
>-static struct ace_reg_ops ace_reg_le16_ops = {
>-	.in = ace_in_le16,
>-	.out = ace_out_le16,
>-	.datain = ace_datain_le16,
>-	.dataout = ace_dataout_le16,
>-};
>-
>-static inline u16 ace_in(struct ace_device *ace, int reg)
>-{
>-	return ace->reg_ops->in(ace, reg);
>-}
>-
>-static inline u32 ace_in32(struct ace_device *ace, int reg)
>-{
>-	return ace_in(ace, reg) | (ace_in(ace, reg + 2) << 16);
>-}
>-
>-static inline void ace_out(struct ace_device *ace, int reg, u16 val)
>-{
>-	ace->reg_ops->out(ace, reg, val);
>-}
>-
>-static inline void ace_out32(struct ace_device *ace, int reg, u32 val)
>-{
>-	ace_out(ace, reg, val);
>-	ace_out(ace, reg + 2, val >> 16);
>-}
>-
>-/* ---------------------------------------------------------------------
>- * Debug support functions
>- */
>-
>-#if defined(DEBUG)
>-static void ace_dump_mem(void *base, int len)
>-{
>-	const char *ptr = base;
>-	int i, j;
>-
>-	for (i = 0; i < len; i += 16) {
>-		printk(KERN_INFO "%.8x:", i);
>-		for (j = 0; j < 16; j++) {
>-			if (!(j % 4))
>-				printk(" ");
>-			printk("%.2x", ptr[i + j]);
>-		}
>-		printk(" ");
>-		for (j = 0; j < 16; j++)
>-			printk("%c", isprint(ptr[i + j]) ? ptr[i + j] : '.');
>-		printk("\n");
>-	}
>-}
>-#else
>-static inline void ace_dump_mem(void *base, int len)
>-{
>-}
>-#endif
>-
>-static void ace_dump_regs(struct ace_device *ace)
>-{
>-	dev_info(ace->dev,
>-		 "    ctrl:  %.8x  seccnt/cmd: %.4x      ver:%.4x\n"
>-		 "    status:%.8x  mpu_lba:%.8x  busmode:%4x\n"
>-		 "    error: %.8x  cfg_lba:%.8x  fatstat:%.4x\n",
>-		 ace_in32(ace, ACE_CTRL),
>-		 ace_in(ace, ACE_SECCNTCMD),
>-		 ace_in(ace, ACE_VERSION),
>-		 ace_in32(ace, ACE_STATUS),
>-		 ace_in32(ace, ACE_MPULBA),
>-		 ace_in(ace, ACE_BUSMODE),
>-		 ace_in32(ace, ACE_ERROR),
>-		 ace_in32(ace, ACE_CFGLBA), ace_in(ace, ACE_FATSTAT));
>-}
>-
>-static void ace_fix_driveid(u16 *id)
>-{
>-#if defined(__BIG_ENDIAN)
>-	int i;
>-
>-	/* All half words have wrong byte order; swap the bytes */
>-	for (i = 0; i < ATA_ID_WORDS; i++, id++)
>-		*id = le16_to_cpu(*id);
>-#endif
>-}
>-
>-/* ---------------------------------------------------------------------
>- * Finite State Machine (FSM) implementation
>- */
>-
>-/* FSM tasks; used to direct state transitions */
>-#define ACE_TASK_IDLE      0
>-#define ACE_TASK_IDENTIFY  1
>-#define ACE_TASK_READ      2
>-#define ACE_TASK_WRITE     3
>-#define ACE_FSM_NUM_TASKS  4
>-
>-/* FSM state definitions */
>-#define ACE_FSM_STATE_IDLE               0
>-#define ACE_FSM_STATE_REQ_LOCK           1
>-#define ACE_FSM_STATE_WAIT_LOCK          2
>-#define ACE_FSM_STATE_WAIT_CFREADY       3
>-#define ACE_FSM_STATE_IDENTIFY_PREPARE   4
>-#define ACE_FSM_STATE_IDENTIFY_TRANSFER  5
>-#define ACE_FSM_STATE_IDENTIFY_COMPLETE  6
>-#define ACE_FSM_STATE_REQ_PREPARE        7
>-#define ACE_FSM_STATE_REQ_TRANSFER       8
>-#define ACE_FSM_STATE_REQ_COMPLETE       9
>-#define ACE_FSM_STATE_ERROR             10
>-#define ACE_FSM_NUM_STATES              11
>-
>-/* Set flag to exit FSM loop and reschedule tasklet */
>-static inline void ace_fsm_yieldpoll(struct ace_device *ace)
>-{
>-	tasklet_schedule(&ace->fsm_tasklet);
>-	ace->fsm_continue_flag = 0;
>-}
>-
>-static inline void ace_fsm_yield(struct ace_device *ace)
>-{
>-	dev_dbg(ace->dev, "%s()\n", __func__);
>-	ace_fsm_yieldpoll(ace);
>-}
>-
>-/* Set flag to exit FSM loop and wait for IRQ to reschedule tasklet */
>-static inline void ace_fsm_yieldirq(struct ace_device *ace)
>-{
>-	dev_dbg(ace->dev, "ace_fsm_yieldirq()\n");
>-
>-	if (ace->irq > 0)
>-		ace->fsm_continue_flag = 0;
>-	else
>-		ace_fsm_yieldpoll(ace);
>-}
>-
>-static bool ace_has_next_request(struct request_queue *q)
>-{
>-	struct ace_device *ace = q->queuedata;
>-
>-	return !list_empty(&ace->rq_list);
>-}
>-
>-/* Get the next read/write request; ending requests that we don't handle */
>-static struct request *ace_get_next_request(struct request_queue *q)
>-{
>-	struct ace_device *ace = q->queuedata;
>-	struct request *rq;
>-
>-	rq = list_first_entry_or_null(&ace->rq_list, struct request, queuelist);
>-	if (rq) {
>-		list_del_init(&rq->queuelist);
>-		blk_mq_start_request(rq);
>-	}
>-
>-	return NULL;
>-}
>-
>-static void ace_fsm_dostate(struct ace_device *ace)
>-{
>-	struct request *req;
>-	u32 status;
>-	u16 val;
>-	int count;
>-
>-#if defined(DEBUG)
>-	dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
>-		ace->fsm_state, ace->id_req_count);
>-#endif
>-
>-	/* Verify that there is actually a CF in the slot. If not, then
>-	 * bail out back to the idle state and wake up all the waiters */
>-	status = ace_in32(ace, ACE_STATUS);
>-	if ((status & ACE_STATUS_CFDETECT) == 0) {
>-		ace->fsm_state = ACE_FSM_STATE_IDLE;
>-		ace->media_change = 1;
>-		set_capacity(ace->gd, 0);
>-		dev_info(ace->dev, "No CF in slot\n");
>-
>-		/* Drop all in-flight and pending requests */
>-		if (ace->req) {
>-			blk_mq_end_request(ace->req, BLK_STS_IOERR);
>-			ace->req = NULL;
>-		}
>-		while ((req = ace_get_next_request(ace->queue)) != NULL)
>-			blk_mq_end_request(req, BLK_STS_IOERR);
>-
>-		/* Drop back to IDLE state and notify waiters */
>-		ace->fsm_state = ACE_FSM_STATE_IDLE;
>-		ace->id_result = -EIO;
>-		while (ace->id_req_count) {
>-			complete(&ace->id_completion);
>-			ace->id_req_count--;
>-		}
>-	}
>-
>-	switch (ace->fsm_state) {
>-	case ACE_FSM_STATE_IDLE:
>-		/* See if there is anything to do */
>-		if (ace->id_req_count || ace_has_next_request(ace->queue)) {
>-			ace->fsm_iter_num++;
>-			ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
>-			mod_timer(&ace->stall_timer, jiffies + HZ);
>-			if (!timer_pending(&ace->stall_timer))
>-				add_timer(&ace->stall_timer);
>-			break;
>-		}
>-		del_timer(&ace->stall_timer);
>-		ace->fsm_continue_flag = 0;
>-		break;
>-
>-	case ACE_FSM_STATE_REQ_LOCK:
>-		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
>-			/* Already have the lock, jump to next state */
>-			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
>-			break;
>-		}
>-
>-		/* Request the lock */
>-		val = ace_in(ace, ACE_CTRL);
>-		ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
>-		ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
>-		break;
>-
>-	case ACE_FSM_STATE_WAIT_LOCK:
>-		if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
>-			/* got the lock; move to next state */
>-			ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
>-			break;
>-		}
>-
>-		/* wait a bit for the lock */
>-		ace_fsm_yield(ace);
>-		break;
>-
>-	case ACE_FSM_STATE_WAIT_CFREADY:
>-		status = ace_in32(ace, ACE_STATUS);
>-		if (!(status & ACE_STATUS_RDYFORCFCMD) ||
>-		    (status & ACE_STATUS_CFBSY)) {
>-			/* CF card isn't ready; it needs to be polled */
>-			ace_fsm_yield(ace);
>-			break;
>-		}
>-
>-		/* Device is ready for command; determine what to do next */
>-		if (ace->id_req_count)
>-			ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
>-		else
>-			ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
>-		break;
>-
>-	case ACE_FSM_STATE_IDENTIFY_PREPARE:
>-		/* Send identify command */
>-		ace->fsm_task = ACE_TASK_IDENTIFY;
>-		ace->data_ptr = ace->cf_id;
>-		ace->data_count = ACE_BUF_PER_SECTOR;
>-		ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);
>-
>-		/* As per datasheet, put config controller in reset */
>-		val = ace_in(ace, ACE_CTRL);
>-		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
>-
>-		/* irq handler takes over from this point; wait for the
>-		 * transfer to complete */
>-		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
>-		ace_fsm_yieldirq(ace);
>-		break;
>-
>-	case ACE_FSM_STATE_IDENTIFY_TRANSFER:
>-		/* Check that the sysace is ready to receive data */
>-		status = ace_in32(ace, ACE_STATUS);
>-		if (status & ACE_STATUS_CFBSY) {
>-			dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
>-				ace->fsm_task, ace->fsm_iter_num,
>-				ace->data_count);
>-			ace_fsm_yield(ace);
>-			break;
>-		}
>-		if (!(status & ACE_STATUS_DATABUFRDY)) {
>-			ace_fsm_yield(ace);
>-			break;
>-		}
>-
>-		/* Transfer the next buffer */
>-		ace->reg_ops->datain(ace);
>-		ace->data_count--;
>-
>-		/* If there are still buffers to be transfers; jump out here */
>-		if (ace->data_count != 0) {
>-			ace_fsm_yieldirq(ace);
>-			break;
>-		}
>-
>-		/* transfer finished; kick state machine */
>-		dev_dbg(ace->dev, "identify finished\n");
>-		ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
>-		break;
>-
>-	case ACE_FSM_STATE_IDENTIFY_COMPLETE:
>-		ace_fix_driveid(ace->cf_id);
>-		ace_dump_mem(ace->cf_id, 512);	/* Debug: Dump out disk ID */
>-
>-		if (ace->data_result) {
>-			/* Error occurred, disable the disk */
>-			ace->media_change = 1;
>-			set_capacity(ace->gd, 0);
>-			dev_err(ace->dev, "error fetching CF id (%i)\n",
>-				ace->data_result);
>-		} else {
>-			ace->media_change = 0;
>-
>-			/* Record disk parameters */
>-			set_capacity(ace->gd,
>-				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
>-			dev_info(ace->dev, "capacity: %i sectors\n",
>-				ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
>-		}
>-
>-		/* We're done, drop to IDLE state and notify waiters */
>-		ace->fsm_state = ACE_FSM_STATE_IDLE;
>-		ace->id_result = ace->data_result;
>-		while (ace->id_req_count) {
>-			complete(&ace->id_completion);
>-			ace->id_req_count--;
>-		}
>-		break;
>-
>-	case ACE_FSM_STATE_REQ_PREPARE:
>-		req = ace_get_next_request(ace->queue);
>-		if (!req) {
>-			ace->fsm_state = ACE_FSM_STATE_IDLE;
>-			break;
>-		}
>-
>-		/* Okay, it's a data request, set it up for transfer */
>-		dev_dbg(ace->dev,
>-			"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
>-			(unsigned long long)blk_rq_pos(req),
>-			blk_rq_sectors(req), blk_rq_cur_sectors(req),
>-			rq_data_dir(req));
>-
>-		ace->req = req;
>-		ace->data_ptr = bio_data(req->bio);
>-		ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
>-		ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
>-
>-		count = blk_rq_sectors(req);
>-		if (rq_data_dir(req)) {
>-			/* Kick off write request */
>-			dev_dbg(ace->dev, "write data\n");
>-			ace->fsm_task = ACE_TASK_WRITE;
>-			ace_out(ace, ACE_SECCNTCMD,
>-				count | ACE_SECCNTCMD_WRITE_DATA);
>-		} else {
>-			/* Kick off read request */
>-			dev_dbg(ace->dev, "read data\n");
>-			ace->fsm_task = ACE_TASK_READ;
>-			ace_out(ace, ACE_SECCNTCMD,
>-				count | ACE_SECCNTCMD_READ_DATA);
>-		}
>-
>-		/* As per datasheet, put config controller in reset */
>-		val = ace_in(ace, ACE_CTRL);
>-		ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
>-
>-		/* Move to the transfer state.  The systemace will raise
>-		 * an interrupt once there is something to do
>-		 */
>-		ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
>-		if (ace->fsm_task == ACE_TASK_READ)
>-			ace_fsm_yieldirq(ace);	/* wait for data ready */
>-		break;
>-
>-	case ACE_FSM_STATE_REQ_TRANSFER:
>-		/* Check that the sysace is ready to receive data */
>-		status = ace_in32(ace, ACE_STATUS);
>-		if (status & ACE_STATUS_CFBSY) {
>-			dev_dbg(ace->dev,
>-				"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
>-				ace->fsm_task, ace->fsm_iter_num,
>-				blk_rq_cur_sectors(ace->req) * 16,
>-				ace->data_count, ace->in_irq);
>-			ace_fsm_yield(ace);	/* need to poll CFBSY bit */
>-			break;
>-		}
>-		if (!(status & ACE_STATUS_DATABUFRDY)) {
>-			dev_dbg(ace->dev,
>-				"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
>-				ace->fsm_task, ace->fsm_iter_num,
>-				blk_rq_cur_sectors(ace->req) * 16,
>-				ace->data_count, ace->in_irq);
>-			ace_fsm_yieldirq(ace);
>-			break;
>-		}
>-
>-		/* Transfer the next buffer */
>-		if (ace->fsm_task == ACE_TASK_WRITE)
>-			ace->reg_ops->dataout(ace);
>-		else
>-			ace->reg_ops->datain(ace);
>-		ace->data_count--;
>-
>-		/* If there are still buffers to be transfers; jump out here */
>-		if (ace->data_count != 0) {
>-			ace_fsm_yieldirq(ace);
>-			break;
>-		}
>-
>-		/* bio finished; is there another one? */
>-		if (blk_update_request(ace->req, BLK_STS_OK,
>-		    blk_rq_cur_bytes(ace->req))) {
>-			/* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
>-			 *      blk_rq_sectors(ace->req),
>-			 *      blk_rq_cur_sectors(ace->req));
>-			 */
>-			ace->data_ptr = bio_data(ace->req->bio);
>-			ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
>-			ace_fsm_yieldirq(ace);
>-			break;
>-		}
>-
>-		ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
>-		break;
>-
>-	case ACE_FSM_STATE_REQ_COMPLETE:
>-		ace->req = NULL;
>-
>-		/* Finished request; go to idle state */
>-		ace->fsm_state = ACE_FSM_STATE_IDLE;
>-		break;
>-
>-	default:
>-		ace->fsm_state = ACE_FSM_STATE_IDLE;
>-		break;
>-	}
>-}
>-
>-static void ace_fsm_tasklet(unsigned long data)
>-{
>-	struct ace_device *ace = (void *)data;
>-	unsigned long flags;
>-
>-	spin_lock_irqsave(&ace->lock, flags);
>-
>-	/* Loop over state machine until told to stop */
>-	ace->fsm_continue_flag = 1;
>-	while (ace->fsm_continue_flag)
>-		ace_fsm_dostate(ace);
>-
>-	spin_unlock_irqrestore(&ace->lock, flags);
>-}
>-
>-static void ace_stall_timer(struct timer_list *t)
>-{
>-	struct ace_device *ace = from_timer(ace, t, stall_timer);
>-	unsigned long flags;
>-
>-	dev_warn(ace->dev,
>-		 "kicking stalled fsm; state=%i task=%i iter=%i dc=%i\n",
>-		 ace->fsm_state, ace->fsm_task, ace->fsm_iter_num,
>-		 ace->data_count);
>-	spin_lock_irqsave(&ace->lock, flags);
>-
>-	/* Rearm the stall timer *before* entering FSM (which may then
>-	 * delete the timer) */
>-	mod_timer(&ace->stall_timer, jiffies + HZ);
>-
>-	/* Loop over state machine until told to stop */
>-	ace->fsm_continue_flag = 1;
>-	while (ace->fsm_continue_flag)
>-		ace_fsm_dostate(ace);
>-
>-	spin_unlock_irqrestore(&ace->lock, flags);
>-}
>-
>-/* ---------------------------------------------------------------------
>- * Interrupt handling routines
>- */
>-static int ace_interrupt_checkstate(struct ace_device *ace)
>-{
>-	u32 sreg = ace_in32(ace, ACE_STATUS);
>-	u16 creg = ace_in(ace, ACE_CTRL);
>-
>-	/* Check for error occurrence */
>-	if ((sreg & (ACE_STATUS_CFGERROR | ACE_STATUS_CFCERROR)) &&
>-	    (creg & ACE_CTRL_ERRORIRQ)) {
>-		dev_err(ace->dev, "transfer failure\n");
>-		ace_dump_regs(ace);
>-		return -EIO;
>-	}
>-
>-	return 0;
>-}
>-
>-static irqreturn_t ace_interrupt(int irq, void *dev_id)
>-{
>-	u16 creg;
>-	struct ace_device *ace = dev_id;
>-
>-	/* be safe and get the lock */
>-	spin_lock(&ace->lock);
>-	ace->in_irq = 1;
>-
>-	/* clear the interrupt */
>-	creg = ace_in(ace, ACE_CTRL);
>-	ace_out(ace, ACE_CTRL, creg | ACE_CTRL_RESETIRQ);
>-	ace_out(ace, ACE_CTRL, creg);
>-
>-	/* check for IO failures */
>-	if (ace_interrupt_checkstate(ace))
>-		ace->data_result = -EIO;
>-
>-	if (ace->fsm_task == 0) {
>-		dev_err(ace->dev,
>-			"spurious irq; stat=%.8x ctrl=%.8x cmd=%.4x\n",
>-			ace_in32(ace, ACE_STATUS), ace_in32(ace, ACE_CTRL),
>-			ace_in(ace, ACE_SECCNTCMD));
>-		dev_err(ace->dev, "fsm_task=%i fsm_state=%i data_count=%i\n",
>-			ace->fsm_task, ace->fsm_state, ace->data_count);
>-	}
>-
>-	/* Loop over state machine until told to stop */
>-	ace->fsm_continue_flag = 1;
>-	while (ace->fsm_continue_flag)
>-		ace_fsm_dostate(ace);
>-
>-	/* done with interrupt; drop the lock */
>-	ace->in_irq = 0;
>-	spin_unlock(&ace->lock);
>-
>-	return IRQ_HANDLED;
>-}
>-
>-/* ---------------------------------------------------------------------
>- * Block ops
>- */
>-static blk_status_t ace_queue_rq(struct blk_mq_hw_ctx *hctx,
>-				 const struct blk_mq_queue_data *bd)
>-{
>-	struct ace_device *ace = hctx->queue->queuedata;
>-	struct request *req = bd->rq;
>-
>-	if (blk_rq_is_passthrough(req)) {
>-		blk_mq_start_request(req);
>-		return BLK_STS_IOERR;
>-	}
>-
>-	spin_lock_irq(&ace->lock);
>-	list_add_tail(&req->queuelist, &ace->rq_list);
>-	spin_unlock_irq(&ace->lock);
>-
>-	tasklet_schedule(&ace->fsm_tasklet);
>-	return BLK_STS_OK;
>-}
>-
>-static unsigned int ace_check_events(struct gendisk *gd, unsigned int clearing)
>-{
>-	struct ace_device *ace = gd->private_data;
>-	dev_dbg(ace->dev, "ace_check_events(): %i\n", ace->media_change);
>-
>-	return ace->media_change ? DISK_EVENT_MEDIA_CHANGE : 0;
>-}
>-
>-static void ace_media_changed(struct ace_device *ace)
>-{
>-	unsigned long flags;
>-
>-	dev_dbg(ace->dev, "requesting cf id and scheduling tasklet\n");
>-
>-	spin_lock_irqsave(&ace->lock, flags);
>-	ace->id_req_count++;
>-	spin_unlock_irqrestore(&ace->lock, flags);
>-
>-	tasklet_schedule(&ace->fsm_tasklet);
>-	wait_for_completion(&ace->id_completion);
>-
>-	dev_dbg(ace->dev, "revalidate complete\n");
>-}
>-
>-static int ace_open(struct block_device *bdev, fmode_t mode)
>-{
>-	struct ace_device *ace = bdev->bd_disk->private_data;
>-	unsigned long flags;
>-
>-	dev_dbg(ace->dev, "ace_open() users=%i\n", ace->users + 1);
>-
>-	mutex_lock(&xsysace_mutex);
>-	spin_lock_irqsave(&ace->lock, flags);
>-	ace->users++;
>-	spin_unlock_irqrestore(&ace->lock, flags);
>-
>-	if (bdev_check_media_change(bdev) && ace->media_change)
>-		ace_media_changed(ace);
>-	mutex_unlock(&xsysace_mutex);
>-
>-	return 0;
>-}
>-
>-static void ace_release(struct gendisk *disk, fmode_t mode)
>-{
>-	struct ace_device *ace = disk->private_data;
>-	unsigned long flags;
>-	u16 val;
>-
>-	dev_dbg(ace->dev, "ace_release() users=%i\n", ace->users - 1);
>-
>-	mutex_lock(&xsysace_mutex);
>-	spin_lock_irqsave(&ace->lock, flags);
>-	ace->users--;
>-	if (ace->users == 0) {
>-		val = ace_in(ace, ACE_CTRL);
>-		ace_out(ace, ACE_CTRL, val & ~ACE_CTRL_LOCKREQ);
>-	}
>-	spin_unlock_irqrestore(&ace->lock, flags);
>-	mutex_unlock(&xsysace_mutex);
>-}
>-
>-static int ace_getgeo(struct block_device *bdev, struct hd_geometry *geo)
>-{
>-	struct ace_device *ace = bdev->bd_disk->private_data;
>-	u16 *cf_id = ace->cf_id;
>-
>-	dev_dbg(ace->dev, "ace_getgeo()\n");
>-
>-	geo->heads	= cf_id[ATA_ID_HEADS];
>-	geo->sectors	= cf_id[ATA_ID_SECTORS];
>-	geo->cylinders	= cf_id[ATA_ID_CYLS];
>-
>-	return 0;
>-}
>-
>-static const struct block_device_operations ace_fops = {
>-	.owner = THIS_MODULE,
>-	.open = ace_open,
>-	.release = ace_release,
>-	.check_events = ace_check_events,
>-	.getgeo = ace_getgeo,
>-};
>-
>-static const struct blk_mq_ops ace_mq_ops = {
>-	.queue_rq	= ace_queue_rq,
>-};
>-
>-/* --------------------------------------------------------------------
>- * SystemACE device setup/teardown code
>- */
>-static int ace_setup(struct ace_device *ace)
>-{
>-	u16 version;
>-	u16 val;
>-	int rc;
>-
>-	dev_dbg(ace->dev, "ace_setup(ace=0x%p)\n", ace);
>-	dev_dbg(ace->dev, "physaddr=0x%llx irq=%i\n",
>-		(unsigned long long)ace->physaddr, ace->irq);
>-
>-	spin_lock_init(&ace->lock);
>-	init_completion(&ace->id_completion);
>-	INIT_LIST_HEAD(&ace->rq_list);
>-
>-	/*
>-	 * Map the device
>-	 */
>-	ace->baseaddr = ioremap(ace->physaddr, 0x80);
>-	if (!ace->baseaddr)
>-		goto err_ioremap;
>-
>-	/*
>-	 * Initialize the state machine tasklet and stall timer
>-	 */
>-	tasklet_init(&ace->fsm_tasklet, ace_fsm_tasklet, (unsigned long)ace);
>-	timer_setup(&ace->stall_timer, ace_stall_timer, 0);
>-
>-	/*
>-	 * Initialize the request queue
>-	 */
>-	ace->queue = blk_mq_init_sq_queue(&ace->tag_set, &ace_mq_ops, 2,
>-						BLK_MQ_F_SHOULD_MERGE);
>-	if (IS_ERR(ace->queue)) {
>-		rc = PTR_ERR(ace->queue);
>-		ace->queue = NULL;
>-		goto err_blk_initq;
>-	}
>-	ace->queue->queuedata = ace;
>-
>-	blk_queue_logical_block_size(ace->queue, 512);
>-	blk_queue_bounce_limit(ace->queue, BLK_BOUNCE_HIGH);
>-
>-	/*
>-	 * Allocate and initialize GD structure
>-	 */
>-	ace->gd = alloc_disk(ACE_NUM_MINORS);
>-	if (!ace->gd)
>-		goto err_alloc_disk;
>-
>-	ace->gd->major = ace_major;
>-	ace->gd->first_minor = ace->id * ACE_NUM_MINORS;
>-	ace->gd->fops = &ace_fops;
>-	ace->gd->events = DISK_EVENT_MEDIA_CHANGE;
>-	ace->gd->queue = ace->queue;
>-	ace->gd->private_data = ace;
>-	snprintf(ace->gd->disk_name, 32, "xs%c", ace->id + 'a');
>-
>-	/* set bus width */
>-	if (ace->bus_width == ACE_BUS_WIDTH_16) {
>-		/* 0x0101 should work regardless of endianess */
>-		ace_out_le16(ace, ACE_BUSMODE, 0x0101);
>-
>-		/* read it back to determine endianess */
>-		if (ace_in_le16(ace, ACE_BUSMODE) == 0x0001)
>-			ace->reg_ops = &ace_reg_le16_ops;
>-		else
>-			ace->reg_ops = &ace_reg_be16_ops;
>-	} else {
>-		ace_out_8(ace, ACE_BUSMODE, 0x00);
>-		ace->reg_ops = &ace_reg_8_ops;
>-	}
>-
>-	/* Make sure version register is sane */
>-	version = ace_in(ace, ACE_VERSION);
>-	if ((version == 0) || (version == 0xFFFF))
>-		goto err_read;
>-
>-	/* Put sysace in a sane state by clearing most control reg bits */
>-	ace_out(ace, ACE_CTRL, ACE_CTRL_FORCECFGMODE |
>-		ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ);
>-
>-	/* Now we can hook up the irq handler */
>-	if (ace->irq > 0) {
>-		rc = request_irq(ace->irq, ace_interrupt, 0, "systemace", ace);
>-		if (rc) {
>-			/* Failure - fall back to polled mode */
>-			dev_err(ace->dev, "request_irq failed\n");
>-			ace->irq = rc;
>-		}
>-	}
>-
>-	/* Enable interrupts */
>-	val = ace_in(ace, ACE_CTRL);
>-	val |= ACE_CTRL_DATABUFRDYIRQ | ACE_CTRL_ERRORIRQ;
>-	ace_out(ace, ACE_CTRL, val);
>-
>-	/* Print the identification */
>-	dev_info(ace->dev, "Xilinx SystemACE revision %i.%i.%i\n",
>-		 (version >> 12) & 0xf, (version >> 8) & 0x0f, version & 0xff);
>-	dev_dbg(ace->dev, "physaddr 0x%llx, mapped to 0x%p, irq=%i\n",
>-		(unsigned long long) ace->physaddr, ace->baseaddr, ace->irq);
>-
>-	ace->media_change = 1;
>-	ace_media_changed(ace);
>-
>-	/* Make the sysace device 'live' */
>-	add_disk(ace->gd);
>-
>-	return 0;
>-
>-err_read:
>-	/* prevent double queue cleanup */
>-	ace->gd->queue = NULL;
>-	put_disk(ace->gd);
>-err_alloc_disk:
>-	blk_cleanup_queue(ace->queue);
>-	blk_mq_free_tag_set(&ace->tag_set);
>-err_blk_initq:
>-	iounmap(ace->baseaddr);
>-err_ioremap:
>-	dev_info(ace->dev, "xsysace: error initializing device at 0x%llx\n",
>-		 (unsigned long long) ace->physaddr);
>-	return -ENOMEM;
>-}
>-
>-static void ace_teardown(struct ace_device *ace)
>-{
>-	if (ace->gd) {
>-		del_gendisk(ace->gd);
>-		put_disk(ace->gd);
>-	}
>-
>-	if (ace->queue) {
>-		blk_cleanup_queue(ace->queue);
>-		blk_mq_free_tag_set(&ace->tag_set);
>-	}
>-
>-	tasklet_kill(&ace->fsm_tasklet);
>-
>-	if (ace->irq > 0)
>-		free_irq(ace->irq, ace);
>-
>-	iounmap(ace->baseaddr);
>-}
>-
>-static int ace_alloc(struct device *dev, int id, resource_size_t physaddr,
>-		     int irq, int bus_width)
>-{
>-	struct ace_device *ace;
>-	int rc;
>-	dev_dbg(dev, "ace_alloc(%p)\n", dev);
>-
>-	/* Allocate and initialize the ace device structure */
>-	ace = kzalloc(sizeof(struct ace_device), GFP_KERNEL);
>-	if (!ace) {
>-		rc = -ENOMEM;
>-		goto err_alloc;
>-	}
>-
>-	ace->dev = dev;
>-	ace->id = id;
>-	ace->physaddr = physaddr;
>-	ace->irq = irq;
>-	ace->bus_width = bus_width;
>-
>-	/* Call the setup code */
>-	rc = ace_setup(ace);
>-	if (rc)
>-		goto err_setup;
>-
>-	dev_set_drvdata(dev, ace);
>-	return 0;
>-
>-err_setup:
>-	dev_set_drvdata(dev, NULL);
>-	kfree(ace);
>-err_alloc:
>-	dev_err(dev, "could not initialize device, err=%i\n", rc);
>-	return rc;
>-}
>-
>-static void ace_free(struct device *dev)
>-{
>-	struct ace_device *ace = dev_get_drvdata(dev);
>-	dev_dbg(dev, "ace_free(%p)\n", dev);
>-
>-	if (ace) {
>-		ace_teardown(ace);
>-		dev_set_drvdata(dev, NULL);
>-		kfree(ace);
>-	}
>-}
>-
>-/* ---------------------------------------------------------------------
>- * Platform Bus Support
>- */
>-
>-static int ace_probe(struct platform_device *dev)
>-{
>-	int bus_width = ACE_BUS_WIDTH_16; /* FIXME: should not be hard coded */
>-	resource_size_t physaddr;
>-	struct resource *res;
>-	u32 id = dev->id;
>-	int irq;
>-	int i;
>-
>-	dev_dbg(&dev->dev, "ace_probe(%p)\n", dev);
>-
>-	/* device id and bus width */
>-	if (of_property_read_u32(dev->dev.of_node, "port-number", &id))
>-		id = 0;
>-	if (of_find_property(dev->dev.of_node, "8-bit", NULL))
>-		bus_width = ACE_BUS_WIDTH_8;
>-
>-	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
>-	if (!res)
>-		return -EINVAL;
>-
>-	physaddr = res->start;
>-	if (!physaddr)
>-		return -ENODEV;
>-
>-	irq = platform_get_irq_optional(dev, 0);
>-
>-	/* Call the bus-independent setup code */
>-	return ace_alloc(&dev->dev, id, physaddr, irq, bus_width);
>-}
>-
>-/*
>- * Platform bus remove() method
>- */
>-static int ace_remove(struct platform_device *dev)
>-{
>-	ace_free(&dev->dev);
>-	return 0;
>-}
>-
>-#if defined(CONFIG_OF)
>-/* Match table for of_platform binding */
>-static const struct of_device_id ace_of_match[] = {
>-	{ .compatible = "xlnx,opb-sysace-1.00.b", },
>-	{ .compatible = "xlnx,opb-sysace-1.00.c", },
>-	{ .compatible = "xlnx,xps-sysace-1.00.a", },
>-	{ .compatible = "xlnx,sysace", },
>-	{},
>-};
>-MODULE_DEVICE_TABLE(of, ace_of_match);
>-#else /* CONFIG_OF */
>-#define ace_of_match NULL
>-#endif /* CONFIG_OF */
>-
>-static struct platform_driver ace_platform_driver = {
>-	.probe = ace_probe,
>-	.remove = ace_remove,
>-	.driver = {
>-		.name = "xsysace",
>-		.of_match_table = ace_of_match,
>-	},
>-};
>-
>-/* ---------------------------------------------------------------------
>- * Module init/exit routines
>- */
>-static int __init ace_init(void)
>-{
>-	int rc;
>-
>-	ace_major = register_blkdev(ace_major, "xsysace");
>-	if (ace_major <= 0) {
>-		rc = -ENOMEM;
>-		goto err_blk;
>-	}
>-
>-	rc = platform_driver_register(&ace_platform_driver);
>-	if (rc)
>-		goto err_plat;
>-
>-	pr_info("Xilinx SystemACE device driver, major=%i\n", ace_major);
>-	return 0;
>-
>-err_plat:
>-	unregister_blkdev(ace_major, "xsysace");
>-err_blk:
>-	printk(KERN_ERR "xsysace: registration failed; err=%i\n", rc);
>-	return rc;
>-}
>-module_init(ace_init);
>-
>-static void __exit ace_exit(void)
>-{
>-	pr_debug("Unregistering Xilinx SystemACE driver\n");
>-	platform_driver_unregister(&ace_platform_driver);
>-	unregister_blkdev(ace_major, "xsysace");
>-}
>-module_exit(ace_exit);
>-- 
>2.29.2
>