Initial import

1 files changed, 1245 insertions, 0 deletions

diff --git a/drivers/block/xsysace.c b/drivers/block/xsysace.c
new file mode 100644
index 000000000..c4328d9d9
--- /dev/null
+++ b/drivers/block/xsysace.c
@@ -0,0 +1,1245 @@
+/*
+ * Xilinx SystemACE device driver
+ *
+ * Copyright 2007 Secret Lab Technologies Ltd.
+ *
+ * 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.
+ */
+
+/*
+ * 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/blkdev.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;
+
+	/* 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_yield(struct ace_device *ace)
+{
+	dev_dbg(ace->dev, "ace_fsm_yield()\n");
+	tasklet_schedule(&ace->fsm_tasklet);
+	ace->fsm_continue_flag = 0;
+}
+
+/* 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)
+		/* No IRQ assigned, so need to poll */
+		tasklet_schedule(&ace->fsm_tasklet);
+	ace->fsm_continue_flag = 0;
+}
+
+/* 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 request *req;
+
+	while ((req = blk_peek_request(q)) != NULL) {
+		if (req->cmd_type == REQ_TYPE_FS)
+			break;
+		blk_start_request(req);
+		__blk_end_request_all(req, -EIO);
+	}
+	return req;
+}
+
+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_end_request_all(ace->req, -EIO);
+			ace->req = NULL;
+		}
+		while ((req = blk_fetch_request(ace->queue)) != NULL)
+			__blk_end_request_all(req, -EIO);
+
+		/* 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_get_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;
+		}
+		blk_start_request(req);
+
+		/* 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_end_request_cur(ace->req, 0)) {
+			/* 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(unsigned long data)
+{
+	struct ace_device *ace = (void *)data;
+	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 void ace_request(struct request_queue * q)
+{
+	struct request *req;
+	struct ace_device *ace;
+
+	req = ace_get_next_request(q);
+
+	if (req) {
+		ace = req->rq_disk->private_data;
+		tasklet_schedule(&ace->fsm_tasklet);
+	}
+}
+
+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 int ace_revalidate_disk(struct gendisk *gd)
+{
+	struct ace_device *ace = gd->private_data;
+	unsigned long flags;
+
+	dev_dbg(ace->dev, "ace_revalidate_disk()\n");
+
+	if (ace->media_change) {
+		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");
+	return ace->id_result;
+}
+
+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);
+
+	check_disk_change(bdev);
+	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,
+	.revalidate_disk = ace_revalidate_disk,
+	.getgeo = ace_getgeo,
+};
+
+/* --------------------------------------------------------------------
+ * 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);
+
+	/*
+	 * 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);
+	setup_timer(&ace->stall_timer, ace_stall_timer, (unsigned long)ace);
+
+	/*
+	 * Initialize the request queue
+	 */
+	ace->queue = blk_init_queue(ace_request, &ace->lock);
+	if (ace->queue == NULL)
+		goto err_blk_initq;
+	blk_queue_logical_block_size(ace->queue, 512);
+
+	/*
+	 * 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->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) {
+		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 = 0;
+		}
+	}
+
+	/* 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_revalidate_disk(ace->gd);
+
+	/* Make the sysace device 'live' */
+	add_disk(ace->gd);
+
+	return 0;
+
+err_read:
+	put_disk(ace->gd);
+err_alloc_disk:
+	blk_cleanup_queue(ace->queue);
+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);
+
+	tasklet_kill(&ace->fsm_tasklet);
+
+	if (ace->irq)
+		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);
+
+	if (!physaddr) {
+		rc = -ENODEV;
+		goto err_noreg;
+	}
+
+	/* 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:
+err_noreg:
+	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)
+{
+	resource_size_t physaddr = 0;
+	int bus_width = ACE_BUS_WIDTH_16; /* FIXME: should not be hard coded */
+	u32 id = dev->id;
+	int irq = 0;
+	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;
+
+	for (i = 0; i < dev->num_resources; i++) {
+		if (dev->resource[i].flags & IORESOURCE_MEM)
+			physaddr = dev->resource[i].start;
+		if (dev->resource[i].flags & IORESOURCE_IRQ)
+			irq = dev->resource[i].start;
+	}
+
+	/* 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);