spi: reorganize drivers

Sort the SPI makefile and enforce the naming convention spi_*.c for
spi drivers.

This change also rolls the contents of atmel_spi.h into the .c file
since there is only one user of that particular include file.

v2: - Use 'spi-' prefix instead of 'spi_' to match what seems to be
      be the predominant pattern for subsystem prefixes.
    - Clean up filenames in Kconfig and header comment blocks

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 1530 deletions

diff --git a/drivers/spi/spi_bfin5xx.c b/drivers/spi/spi_bfin5xx.c
deleted file mode 100644
index f706dba..0000000
--- a/drivers/spi/spi_bfin5xx.c
+++ /dev/null
@@ -1,1530 +0,0 @@
-/*
- * Blackfin On-Chip SPI Driver
- *
- * Copyright 2004-2010 Analog Devices Inc.
- *
- * Enter bugs at http://blackfin.uclinux.org/
- *
- * Licensed under the GPL-2 or later.
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/ioport.h>
-#include <linux/irq.h>
-#include <linux/errno.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/dma-mapping.h>
-#include <linux/spi/spi.h>
-#include <linux/workqueue.h>
-
-#include <asm/dma.h>
-#include <asm/portmux.h>
-#include <asm/bfin5xx_spi.h>
-#include <asm/cacheflush.h>
-
-#define DRV_NAME	"bfin-spi"
-#define DRV_AUTHOR	"Bryan Wu, Luke Yang"
-#define DRV_DESC	"Blackfin on-chip SPI Controller Driver"
-#define DRV_VERSION	"1.0"
-
-MODULE_AUTHOR(DRV_AUTHOR);
-MODULE_DESCRIPTION(DRV_DESC);
-MODULE_LICENSE("GPL");
-
-#define START_STATE	((void *)0)
-#define RUNNING_STATE	((void *)1)
-#define DONE_STATE	((void *)2)
-#define ERROR_STATE	((void *)-1)
-
-struct bfin_spi_master_data;
-
-struct bfin_spi_transfer_ops {
-	void (*write) (struct bfin_spi_master_data *);
-	void (*read) (struct bfin_spi_master_data *);
-	void (*duplex) (struct bfin_spi_master_data *);
-};
-
-struct bfin_spi_master_data {
-	/* Driver model hookup */
-	struct platform_device *pdev;
-
-	/* SPI framework hookup */
-	struct spi_master *master;
-
-	/* Regs base of SPI controller */
-	void __iomem *regs_base;
-
-	/* Pin request list */
-	u16 *pin_req;
-
-	/* BFIN hookup */
-	struct bfin5xx_spi_master *master_info;
-
-	/* Driver message queue */
-	struct workqueue_struct *workqueue;
-	struct work_struct pump_messages;
-	spinlock_t lock;
-	struct list_head queue;
-	int busy;
-	bool running;
-
-	/* Message Transfer pump */
-	struct tasklet_struct pump_transfers;
-
-	/* Current message transfer state info */
-	struct spi_message *cur_msg;
-	struct spi_transfer *cur_transfer;
-	struct bfin_spi_slave_data *cur_chip;
-	size_t len_in_bytes;
-	size_t len;
-	void *tx;
-	void *tx_end;
-	void *rx;
-	void *rx_end;
-
-	/* DMA stuffs */
-	int dma_channel;
-	int dma_mapped;
-	int dma_requested;
-	dma_addr_t rx_dma;
-	dma_addr_t tx_dma;
-
-	int irq_requested;
-	int spi_irq;
-
-	size_t rx_map_len;
-	size_t tx_map_len;
-	u8 n_bytes;
-	u16 ctrl_reg;
-	u16 flag_reg;
-
-	int cs_change;
-	const struct bfin_spi_transfer_ops *ops;
-};
-
-struct bfin_spi_slave_data {
-	u16 ctl_reg;
-	u16 baud;
-	u16 flag;
-
-	u8 chip_select_num;
-	u8 enable_dma;
-	u16 cs_chg_udelay;	/* Some devices require > 255usec delay */
-	u32 cs_gpio;
-	u16 idle_tx_val;
-	u8 pio_interrupt;	/* use spi data irq */
-	const struct bfin_spi_transfer_ops *ops;
-};
-
-#define DEFINE_SPI_REG(reg, off) \
-static inline u16 read_##reg(struct bfin_spi_master_data *drv_data) \
-	{ return bfin_read16(drv_data->regs_base + off); } \
-static inline void write_##reg(struct bfin_spi_master_data *drv_data, u16 v) \
-	{ bfin_write16(drv_data->regs_base + off, v); }
-
-DEFINE_SPI_REG(CTRL, 0x00)
-DEFINE_SPI_REG(FLAG, 0x04)
-DEFINE_SPI_REG(STAT, 0x08)
-DEFINE_SPI_REG(TDBR, 0x0C)
-DEFINE_SPI_REG(RDBR, 0x10)
-DEFINE_SPI_REG(BAUD, 0x14)
-DEFINE_SPI_REG(SHAW, 0x18)
-
-static void bfin_spi_enable(struct bfin_spi_master_data *drv_data)
-{
-	u16 cr;
-
-	cr = read_CTRL(drv_data);
-	write_CTRL(drv_data, (cr | BIT_CTL_ENABLE));
-}
-
-static void bfin_spi_disable(struct bfin_spi_master_data *drv_data)
-{
-	u16 cr;
-
-	cr = read_CTRL(drv_data);
-	write_CTRL(drv_data, (cr & (~BIT_CTL_ENABLE)));
-}
-
-/* Caculate the SPI_BAUD register value based on input HZ */
-static u16 hz_to_spi_baud(u32 speed_hz)
-{
-	u_long sclk = get_sclk();
-	u16 spi_baud = (sclk / (2 * speed_hz));
-
-	if ((sclk % (2 * speed_hz)) > 0)
-		spi_baud++;
-
-	if (spi_baud < MIN_SPI_BAUD_VAL)
-		spi_baud = MIN_SPI_BAUD_VAL;
-
-	return spi_baud;
-}
-
-static int bfin_spi_flush(struct bfin_spi_master_data *drv_data)
-{
-	unsigned long limit = loops_per_jiffy << 1;
-
-	/* wait for stop and clear stat */
-	while (!(read_STAT(drv_data) & BIT_STAT_SPIF) && --limit)
-		cpu_relax();
-
-	write_STAT(drv_data, BIT_STAT_CLR);
-
-	return limit;
-}
-
-/* Chip select operation functions for cs_change flag */
-static void bfin_spi_cs_active(struct bfin_spi_master_data *drv_data, struct bfin_spi_slave_data *chip)
-{
-	if (likely(chip->chip_select_num < MAX_CTRL_CS)) {
-		u16 flag = read_FLAG(drv_data);
-
-		flag &= ~chip->flag;
-
-		write_FLAG(drv_data, flag);
-	} else {
-		gpio_set_value(chip->cs_gpio, 0);
-	}
-}
-
-static void bfin_spi_cs_deactive(struct bfin_spi_master_data *drv_data,
-                                 struct bfin_spi_slave_data *chip)
-{
-	if (likely(chip->chip_select_num < MAX_CTRL_CS)) {
-		u16 flag = read_FLAG(drv_data);
-
-		flag |= chip->flag;
-
-		write_FLAG(drv_data, flag);
-	} else {
-		gpio_set_value(chip->cs_gpio, 1);
-	}
-
-	/* Move delay here for consistency */
-	if (chip->cs_chg_udelay)
-		udelay(chip->cs_chg_udelay);
-}
-
-/* enable or disable the pin muxed by GPIO and SPI CS to work as SPI CS */
-static inline void bfin_spi_cs_enable(struct bfin_spi_master_data *drv_data,
-                                      struct bfin_spi_slave_data *chip)
-{
-	if (chip->chip_select_num < MAX_CTRL_CS) {
-		u16 flag = read_FLAG(drv_data);
-
-		flag |= (chip->flag >> 8);
-
-		write_FLAG(drv_data, flag);
-	}
-}
-
-static inline void bfin_spi_cs_disable(struct bfin_spi_master_data *drv_data,
-                                       struct bfin_spi_slave_data *chip)
-{
-	if (chip->chip_select_num < MAX_CTRL_CS) {
-		u16 flag = read_FLAG(drv_data);
-
-		flag &= ~(chip->flag >> 8);
-
-		write_FLAG(drv_data, flag);
-	}
-}
-
-/* stop controller and re-config current chip*/
-static void bfin_spi_restore_state(struct bfin_spi_master_data *drv_data)
-{
-	struct bfin_spi_slave_data *chip = drv_data->cur_chip;
-
-	/* Clear status and disable clock */
-	write_STAT(drv_data, BIT_STAT_CLR);
-	bfin_spi_disable(drv_data);
-	dev_dbg(&drv_data->pdev->dev, "restoring spi ctl state\n");
-
-	SSYNC();
-
-	/* Load the registers */
-	write_CTRL(drv_data, chip->ctl_reg);
-	write_BAUD(drv_data, chip->baud);
-
-	bfin_spi_enable(drv_data);
-	bfin_spi_cs_active(drv_data, chip);
-}
-
-/* used to kick off transfer in rx mode and read unwanted RX data */
-static inline void bfin_spi_dummy_read(struct bfin_spi_master_data *drv_data)
-{
-	(void) read_RDBR(drv_data);
-}
-
-static void bfin_spi_u8_writer(struct bfin_spi_master_data *drv_data)
-{
-	/* clear RXS (we check for RXS inside the loop) */
-	bfin_spi_dummy_read(drv_data);
-
-	while (drv_data->tx < drv_data->tx_end) {
-		write_TDBR(drv_data, (*(u8 *) (drv_data->tx++)));
-		/* wait until transfer finished.
-		   checking SPIF or TXS may not guarantee transfer completion */
-		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-			cpu_relax();
-		/* discard RX data and clear RXS */
-		bfin_spi_dummy_read(drv_data);
-	}
-}
-
-static void bfin_spi_u8_reader(struct bfin_spi_master_data *drv_data)
-{
-	u16 tx_val = drv_data->cur_chip->idle_tx_val;
-
-	/* discard old RX data and clear RXS */
-	bfin_spi_dummy_read(drv_data);
-
-	while (drv_data->rx < drv_data->rx_end) {
-		write_TDBR(drv_data, tx_val);
-		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-			cpu_relax();
-		*(u8 *) (drv_data->rx++) = read_RDBR(drv_data);
-	}
-}
-
-static void bfin_spi_u8_duplex(struct bfin_spi_master_data *drv_data)
-{
-	/* discard old RX data and clear RXS */
-	bfin_spi_dummy_read(drv_data);
-
-	while (drv_data->rx < drv_data->rx_end) {
-		write_TDBR(drv_data, (*(u8 *) (drv_data->tx++)));
-		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-			cpu_relax();
-		*(u8 *) (drv_data->rx++) = read_RDBR(drv_data);
-	}
-}
-
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u8 = {
-	.write  = bfin_spi_u8_writer,
-	.read   = bfin_spi_u8_reader,
-	.duplex = bfin_spi_u8_duplex,
-};
-
-static void bfin_spi_u16_writer(struct bfin_spi_master_data *drv_data)
-{
-	/* clear RXS (we check for RXS inside the loop) */
-	bfin_spi_dummy_read(drv_data);
-
-	while (drv_data->tx < drv_data->tx_end) {
-		write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
-		drv_data->tx += 2;
-		/* wait until transfer finished.
-		   checking SPIF or TXS may not guarantee transfer completion */
-		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-			cpu_relax();
-		/* discard RX data and clear RXS */
-		bfin_spi_dummy_read(drv_data);
-	}
-}
-
-static void bfin_spi_u16_reader(struct bfin_spi_master_data *drv_data)
-{
-	u16 tx_val = drv_data->cur_chip->idle_tx_val;
-
-	/* discard old RX data and clear RXS */
-	bfin_spi_dummy_read(drv_data);
-
-	while (drv_data->rx < drv_data->rx_end) {
-		write_TDBR(drv_data, tx_val);
-		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-			cpu_relax();
-		*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
-		drv_data->rx += 2;
-	}
-}
-
-static void bfin_spi_u16_duplex(struct bfin_spi_master_data *drv_data)
-{
-	/* discard old RX data and clear RXS */
-	bfin_spi_dummy_read(drv_data);
-
-	while (drv_data->rx < drv_data->rx_end) {
-		write_TDBR(drv_data, (*(u16 *) (drv_data->tx)));
-		drv_data->tx += 2;
-		while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-			cpu_relax();
-		*(u16 *) (drv_data->rx) = read_RDBR(drv_data);
-		drv_data->rx += 2;
-	}
-}
-
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u16 = {
-	.write  = bfin_spi_u16_writer,
-	.read   = bfin_spi_u16_reader,
-	.duplex = bfin_spi_u16_duplex,
-};
-
-/* test if there is more transfer to be done */
-static void *bfin_spi_next_transfer(struct bfin_spi_master_data *drv_data)
-{
-	struct spi_message *msg = drv_data->cur_msg;
-	struct spi_transfer *trans = drv_data->cur_transfer;
-
-	/* Move to next transfer */
-	if (trans->transfer_list.next != &msg->transfers) {
-		drv_data->cur_transfer =
-		    list_entry(trans->transfer_list.next,
-			       struct spi_transfer, transfer_list);
-		return RUNNING_STATE;
-	} else
-		return DONE_STATE;
-}
-
-/*
- * caller already set message->status;
- * dma and pio irqs are blocked give finished message back
- */
-static void bfin_spi_giveback(struct bfin_spi_master_data *drv_data)
-{
-	struct bfin_spi_slave_data *chip = drv_data->cur_chip;
-	struct spi_transfer *last_transfer;
-	unsigned long flags;
-	struct spi_message *msg;
-
-	spin_lock_irqsave(&drv_data->lock, flags);
-	msg = drv_data->cur_msg;
-	drv_data->cur_msg = NULL;
-	drv_data->cur_transfer = NULL;
-	drv_data->cur_chip = NULL;
-	queue_work(drv_data->workqueue, &drv_data->pump_messages);
-	spin_unlock_irqrestore(&drv_data->lock, flags);
-
-	last_transfer = list_entry(msg->transfers.prev,
-				   struct spi_transfer, transfer_list);
-
-	msg->state = NULL;
-
-	if (!drv_data->cs_change)
-		bfin_spi_cs_deactive(drv_data, chip);
-
-	/* Not stop spi in autobuffer mode */
-	if (drv_data->tx_dma != 0xFFFF)
-		bfin_spi_disable(drv_data);
-
-	if (msg->complete)
-		msg->complete(msg->context);
-}
-
-/* spi data irq handler */
-static irqreturn_t bfin_spi_pio_irq_handler(int irq, void *dev_id)
-{
-	struct bfin_spi_master_data *drv_data = dev_id;
-	struct bfin_spi_slave_data *chip = drv_data->cur_chip;
-	struct spi_message *msg = drv_data->cur_msg;
-	int n_bytes = drv_data->n_bytes;
-	int loop = 0;
-
-	/* wait until transfer finished. */
-	while (!(read_STAT(drv_data) & BIT_STAT_RXS))
-		cpu_relax();
-
-	if ((drv_data->tx && drv_data->tx >= drv_data->tx_end) ||
-		(drv_data->rx && drv_data->rx >= (drv_data->rx_end - n_bytes))) {
-		/* last read */
-		if (drv_data->rx) {
-			dev_dbg(&drv_data->pdev->dev, "last read\n");
-			if (n_bytes % 2) {
-				u16 *buf = (u16 *)drv_data->rx;
-				for (loop = 0; loop < n_bytes / 2; loop++)
-					*buf++ = read_RDBR(drv_data);
-			} else {
-				u8 *buf = (u8 *)drv_data->rx;
-				for (loop = 0; loop < n_bytes; loop++)
-					*buf++ = read_RDBR(drv_data);
-			}
-			drv_data->rx += n_bytes;
-		}
-
-		msg->actual_length += drv_data->len_in_bytes;
-		if (drv_data->cs_change)
-			bfin_spi_cs_deactive(drv_data, chip);
-		/* Move to next transfer */
-		msg->state = bfin_spi_next_transfer(drv_data);
-
-		disable_irq_nosync(drv_data->spi_irq);
-
-		/* Schedule transfer tasklet */
-		tasklet_schedule(&drv_data->pump_transfers);
-		return IRQ_HANDLED;
-	}
-
-	if (drv_data->rx && drv_data->tx) {
-		/* duplex */
-		dev_dbg(&drv_data->pdev->dev, "duplex: write_TDBR\n");
-		if (n_bytes % 2) {
-			u16 *buf = (u16 *)drv_data->rx;
-			u16 *buf2 = (u16 *)drv_data->tx;
-			for (loop = 0; loop < n_bytes / 2; loop++) {
-				*buf++ = read_RDBR(drv_data);
-				write_TDBR(drv_data, *buf2++);
-			}
-		} else {
-			u8 *buf = (u8 *)drv_data->rx;
-			u8 *buf2 = (u8 *)drv_data->tx;
-			for (loop = 0; loop < n_bytes; loop++) {
-				*buf++ = read_RDBR(drv_data);
-				write_TDBR(drv_data, *buf2++);
-			}
-		}
-	} else if (drv_data->rx) {
-		/* read */
-		dev_dbg(&drv_data->pdev->dev, "read: write_TDBR\n");
-		if (n_bytes % 2) {
-			u16 *buf = (u16 *)drv_data->rx;
-			for (loop = 0; loop < n_bytes / 2; loop++) {
-				*buf++ = read_RDBR(drv_data);
-				write_TDBR(drv_data, chip->idle_tx_val);
-			}
-		} else {
-			u8 *buf = (u8 *)drv_data->rx;
-			for (loop = 0; loop < n_bytes; loop++) {
-				*buf++ = read_RDBR(drv_data);
-				write_TDBR(drv_data, chip->idle_tx_val);
-			}
-		}
-	} else if (drv_data->tx) {
-		/* write */
-		dev_dbg(&drv_data->pdev->dev, "write: write_TDBR\n");
-		if (n_bytes % 2) {
-			u16 *buf = (u16 *)drv_data->tx;
-			for (loop = 0; loop < n_bytes / 2; loop++) {
-				read_RDBR(drv_data);
-				write_TDBR(drv_data, *buf++);
-			}
-		} else {
-			u8 *buf = (u8 *)drv_data->tx;
-			for (loop = 0; loop < n_bytes; loop++) {
-				read_RDBR(drv_data);
-				write_TDBR(drv_data, *buf++);
-			}
-		}
-	}
-
-	if (drv_data->tx)
-		drv_data->tx += n_bytes;
-	if (drv_data->rx)
-		drv_data->rx += n_bytes;
-
-	return IRQ_HANDLED;
-}
-
-static irqreturn_t bfin_spi_dma_irq_handler(int irq, void *dev_id)
-{
-	struct bfin_spi_master_data *drv_data = dev_id;
-	struct bfin_spi_slave_data *chip = drv_data->cur_chip;
-	struct spi_message *msg = drv_data->cur_msg;
-	unsigned long timeout;
-	unsigned short dmastat = get_dma_curr_irqstat(drv_data->dma_channel);
-	u16 spistat = read_STAT(drv_data);
-
-	dev_dbg(&drv_data->pdev->dev,
-		"in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
-		dmastat, spistat);
-
-	if (drv_data->rx != NULL) {
-		u16 cr = read_CTRL(drv_data);
-		/* discard old RX data and clear RXS */
-		bfin_spi_dummy_read(drv_data);
-		write_CTRL(drv_data, cr & ~BIT_CTL_ENABLE); /* Disable SPI */
-		write_CTRL(drv_data, cr & ~BIT_CTL_TIMOD); /* Restore State */
-		write_STAT(drv_data, BIT_STAT_CLR); /* Clear Status */
-	}
-
-	clear_dma_irqstat(drv_data->dma_channel);
-
-	/*
-	 * wait for the last transaction shifted out.  HRM states:
-	 * at this point there may still be data in the SPI DMA FIFO waiting
-	 * to be transmitted ... software needs to poll TXS in the SPI_STAT
-	 * register until it goes low for 2 successive reads
-	 */
-	if (drv_data->tx != NULL) {
-		while ((read_STAT(drv_data) & BIT_STAT_TXS) ||
-		       (read_STAT(drv_data) & BIT_STAT_TXS))
-			cpu_relax();
-	}
-
-	dev_dbg(&drv_data->pdev->dev,
-		"in dma_irq_handler dmastat:0x%x spistat:0x%x\n",
-		dmastat, read_STAT(drv_data));
-
-	timeout = jiffies + HZ;
-	while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
-		if (!time_before(jiffies, timeout)) {
-			dev_warn(&drv_data->pdev->dev, "timeout waiting for SPIF");
-			break;
-		} else
-			cpu_relax();
-
-	if ((dmastat & DMA_ERR) && (spistat & BIT_STAT_RBSY)) {
-		msg->state = ERROR_STATE;
-		dev_err(&drv_data->pdev->dev, "dma receive: fifo/buffer overflow\n");
-	} else {
-		msg->actual_length += drv_data->len_in_bytes;
-
-		if (drv_data->cs_change)
-			bfin_spi_cs_deactive(drv_data, chip);
-
-		/* Move to next transfer */
-		msg->state = bfin_spi_next_transfer(drv_data);
-	}
-
-	/* Schedule transfer tasklet */
-	tasklet_schedule(&drv_data->pump_transfers);
-
-	/* free the irq handler before next transfer */
-	dev_dbg(&drv_data->pdev->dev,
-		"disable dma channel irq%d\n",
-		drv_data->dma_channel);
-	dma_disable_irq_nosync(drv_data->dma_channel);
-
-	return IRQ_HANDLED;
-}
-
-static void bfin_spi_pump_transfers(unsigned long data)
-{
-	struct bfin_spi_master_data *drv_data = (struct bfin_spi_master_data *)data;
-	struct spi_message *message = NULL;
-	struct spi_transfer *transfer = NULL;
-	struct spi_transfer *previous = NULL;
-	struct bfin_spi_slave_data *chip = NULL;
-	unsigned int bits_per_word;
-	u16 cr, cr_width, dma_width, dma_config;
-	u32 tranf_success = 1;
-	u8 full_duplex = 0;
-
-	/* Get current state information */
-	message = drv_data->cur_msg;
-	transfer = drv_data->cur_transfer;
-	chip = drv_data->cur_chip;
-
-	/*
-	 * if msg is error or done, report it back using complete() callback
-	 */
-
-	 /* Handle for abort */
-	if (message->state == ERROR_STATE) {
-		dev_dbg(&drv_data->pdev->dev, "transfer: we've hit an error\n");
-		message->status = -EIO;
-		bfin_spi_giveback(drv_data);
-		return;
-	}
-
-	/* Handle end of message */
-	if (message->state == DONE_STATE) {
-		dev_dbg(&drv_data->pdev->dev, "transfer: all done!\n");
-		message->status = 0;
-		bfin_spi_giveback(drv_data);
-		return;
-	}
-
-	/* Delay if requested at end of transfer */
-	if (message->state == RUNNING_STATE) {
-		dev_dbg(&drv_data->pdev->dev, "transfer: still running ...\n");
-		previous = list_entry(transfer->transfer_list.prev,
-				      struct spi_transfer, transfer_list);
-		if (previous->delay_usecs)
-			udelay(previous->delay_usecs);
-	}
-
-	/* Flush any existing transfers that may be sitting in the hardware */
-	if (bfin_spi_flush(drv_data) == 0) {
-		dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
-		message->status = -EIO;
-		bfin_spi_giveback(drv_data);
-		return;
-	}
-
-	if (transfer->len == 0) {
-		/* Move to next transfer of this msg */
-		message->state = bfin_spi_next_transfer(drv_data);
-		/* Schedule next transfer tasklet */
-		tasklet_schedule(&drv_data->pump_transfers);
-		return;
-	}
-
-	if (transfer->tx_buf != NULL) {
-		drv_data->tx = (void *)transfer->tx_buf;
-		drv_data->tx_end = drv_data->tx + transfer->len;
-		dev_dbg(&drv_data->pdev->dev, "tx_buf is %p, tx_end is %p\n",
-			transfer->tx_buf, drv_data->tx_end);
-	} else {
-		drv_data->tx = NULL;
-	}
-
-	if (transfer->rx_buf != NULL) {
-		full_duplex = transfer->tx_buf != NULL;
-		drv_data->rx = transfer->rx_buf;
-		drv_data->rx_end = drv_data->rx + transfer->len;
-		dev_dbg(&drv_data->pdev->dev, "rx_buf is %p, rx_end is %p\n",
-			transfer->rx_buf, drv_data->rx_end);
-	} else {
-		drv_data->rx = NULL;
-	}
-
-	drv_data->rx_dma = transfer->rx_dma;
-	drv_data->tx_dma = transfer->tx_dma;
-	drv_data->len_in_bytes = transfer->len;
-	drv_data->cs_change = transfer->cs_change;
-
-	/* Bits per word setup */
-	bits_per_word = transfer->bits_per_word ? : message->spi->bits_per_word;
-	if ((bits_per_word > 0) && (bits_per_word % 16 == 0)) {
-		drv_data->n_bytes = bits_per_word/8;
-		drv_data->len = (transfer->len) >> 1;
-		cr_width = BIT_CTL_WORDSIZE;
-		drv_data->ops = &bfin_bfin_spi_transfer_ops_u16;
-	} else if ((bits_per_word > 0) && (bits_per_word % 8 == 0)) {
-		drv_data->n_bytes = bits_per_word/8;
-		drv_data->len = transfer->len;
-		cr_width = 0;
-		drv_data->ops = &bfin_bfin_spi_transfer_ops_u8;
-	} else {
-		dev_err(&drv_data->pdev->dev, "transfer: unsupported bits_per_word\n");
-		message->status = -EINVAL;
-		bfin_spi_giveback(drv_data);
-		return;
-	}
-	cr = read_CTRL(drv_data) & ~(BIT_CTL_TIMOD | BIT_CTL_WORDSIZE);
-	cr |= cr_width;
-	write_CTRL(drv_data, cr);
-
-	dev_dbg(&drv_data->pdev->dev,
-		"transfer: drv_data->ops is %p, chip->ops is %p, u8_ops is %p\n",
-		drv_data->ops, chip->ops, &bfin_bfin_spi_transfer_ops_u8);
-
-	message->state = RUNNING_STATE;
-	dma_config = 0;
-
-	/* Speed setup (surely valid because already checked) */
-	if (transfer->speed_hz)
-		write_BAUD(drv_data, hz_to_spi_baud(transfer->speed_hz));
-	else
-		write_BAUD(drv_data, chip->baud);
-
-	write_STAT(drv_data, BIT_STAT_CLR);
-	bfin_spi_cs_active(drv_data, chip);
-
-	dev_dbg(&drv_data->pdev->dev,
-		"now pumping a transfer: width is %d, len is %d\n",
-		cr_width, transfer->len);
-
-	/*
-	 * Try to map dma buffer and do a dma transfer.  If successful use,
-	 * different way to r/w according to the enable_dma settings and if
-	 * we are not doing a full duplex transfer (since the hardware does
-	 * not support full duplex DMA transfers).
-	 */
-	if (!full_duplex && drv_data->cur_chip->enable_dma
-				&& drv_data->len > 6) {
-
-		unsigned long dma_start_addr, flags;
-
-		disable_dma(drv_data->dma_channel);
-		clear_dma_irqstat(drv_data->dma_channel);
-
-		/* config dma channel */
-		dev_dbg(&drv_data->pdev->dev, "doing dma transfer\n");
-		set_dma_x_count(drv_data->dma_channel, drv_data->len);
-		if (cr_width == BIT_CTL_WORDSIZE) {
-			set_dma_x_modify(drv_data->dma_channel, 2);
-			dma_width = WDSIZE_16;
-		} else {
-			set_dma_x_modify(drv_data->dma_channel, 1);
-			dma_width = WDSIZE_8;
-		}
-
-		/* poll for SPI completion before start */
-		while (!(read_STAT(drv_data) & BIT_STAT_SPIF))
-			cpu_relax();
-
-		/* dirty hack for autobuffer DMA mode */
-		if (drv_data->tx_dma == 0xFFFF) {
-			dev_dbg(&drv_data->pdev->dev,
-				"doing autobuffer DMA out.\n");
-
-			/* no irq in autobuffer mode */
-			dma_config =
-			    (DMAFLOW_AUTO | RESTART | dma_width | DI_EN);
-			set_dma_config(drv_data->dma_channel, dma_config);
-			set_dma_start_addr(drv_data->dma_channel,
-					(unsigned long)drv_data->tx);
-			enable_dma(drv_data->dma_channel);
-
-			/* start SPI transfer */
-			write_CTRL(drv_data, cr | BIT_CTL_TIMOD_DMA_TX);
-
-			/* just return here, there can only be one transfer
-			 * in this mode
-			 */
-			message->status = 0;
-			bfin_spi_giveback(drv_data);
-			return;
-		}
-
-		/* In dma mode, rx or tx must be NULL in one transfer */
-		dma_config = (RESTART | dma_width | DI_EN);
-		if (drv_data->rx != NULL) {
-			/* set transfer mode, and enable SPI */
-			dev_dbg(&drv_data->pdev->dev, "doing DMA in to %p (size %zx)\n",
-				drv_data->rx, drv_data->len_in_bytes);
-
-			/* invalidate caches, if needed */
-			if (bfin_addr_dcacheable((unsigned long) drv_data->rx))
-				invalidate_dcache_range((unsigned long) drv_data->rx,
-							(unsigned long) (drv_data->rx +
-							drv_data->len_in_bytes));
-
-			dma_config |= WNR;
-			dma_start_addr = (unsigned long)drv_data->rx;
-			cr |= BIT_CTL_TIMOD_DMA_RX | BIT_CTL_SENDOPT;
-
-		} else if (drv_data->tx != NULL) {
-			dev_dbg(&drv_data->pdev->dev, "doing DMA out.\n");
-
-			/* flush caches, if needed */
-			if (bfin_addr_dcacheable((unsigned long) drv_data->tx))
-				flush_dcache_range((unsigned long) drv_data->tx,
-						(unsigned long) (drv_data->tx +
-						drv_data->len_in_bytes));
-
-			dma_start_addr = (unsigned long)drv_data->tx;
-			cr |= BIT_CTL_TIMOD_DMA_TX;
-
-		} else
-			BUG();
-
-		/* oh man, here there be monsters ... and i dont mean the
-		 * fluffy cute ones from pixar, i mean the kind that'll eat
-		 * your data, kick your dog, and love it all.  do *not* try
-		 * and change these lines unless you (1) heavily test DMA
-		 * with SPI flashes on a loaded system (e.g. ping floods),
-		 * (2) know just how broken the DMA engine interaction with
-		 * the SPI peripheral is, and (3) have someone else to blame
-		 * when you screw it all up anyways.
-		 */
-		set_dma_start_addr(drv_data->dma_channel, dma_start_addr);
-		set_dma_config(drv_data->dma_channel, dma_config);
-		local_irq_save(flags);
-		SSYNC();
-		write_CTRL(drv_data, cr);
-		enable_dma(drv_data->dma_channel);
-		dma_enable_irq(drv_data->dma_channel);
-		local_irq_restore(flags);
-
-		return;
-	}
-
-	/*
-	 * We always use SPI_WRITE mode (transfer starts with TDBR write).
-	 * SPI_READ mode (transfer starts with RDBR read) seems to have
-	 * problems with setting up the output value in TDBR prior to the
-	 * start of the transfer.
-	 */
-	write_CTRL(drv_data, cr | BIT_CTL_TXMOD);
-
-	if (chip->pio_interrupt) {
-		/* SPI irq should have been disabled by now */
-
-		/* discard old RX data and clear RXS */
-		bfin_spi_dummy_read(drv_data);
-
-		/* start transfer */
-		if (drv_data->tx == NULL)
-			write_TDBR(drv_data, chip->idle_tx_val);
-		else {
-			int loop;
-			if (bits_per_word % 16 == 0) {
-				u16 *buf = (u16 *)drv_data->tx;
-				for (loop = 0; loop < bits_per_word / 16;
-						loop++) {
-					write_TDBR(drv_data, *buf++);
-				}
-			} else if (bits_per_word % 8 == 0) {
-				u8 *buf = (u8 *)drv_data->tx;
-				for (loop = 0; loop < bits_per_word / 8; loop++)
-					write_TDBR(drv_data, *buf++);
-			}
-
-			drv_data->tx += drv_data->n_bytes;
-		}
-
-		/* once TDBR is empty, interrupt is triggered */
-		enable_irq(drv_data->spi_irq);
-		return;
-	}
-
-	/* IO mode */
-	dev_dbg(&drv_data->pdev->dev, "doing IO transfer\n");
-
-	if (full_duplex) {
-		/* full duplex mode */
-		BUG_ON((drv_data->tx_end - drv_data->tx) !=
-		       (drv_data->rx_end - drv_data->rx));
-		dev_dbg(&drv_data->pdev->dev,
-			"IO duplex: cr is 0x%x\n", cr);
-
-		drv_data->ops->duplex(drv_data);
-
-		if (drv_data->tx != drv_data->tx_end)
-			tranf_success = 0;
-	} else if (drv_data->tx != NULL) {
-		/* write only half duplex */
-		dev_dbg(&drv_data->pdev->dev,
-			"IO write: cr is 0x%x\n", cr);
-
-		drv_data->ops->write(drv_data);
-
-		if (drv_data->tx != drv_data->tx_end)
-			tranf_success = 0;
-	} else if (drv_data->rx != NULL) {
-		/* read only half duplex */
-		dev_dbg(&drv_data->pdev->dev,
-			"IO read: cr is 0x%x\n", cr);
-
-		drv_data->ops->read(drv_data);
-		if (drv_data->rx != drv_data->rx_end)
-			tranf_success = 0;
-	}
-
-	if (!tranf_success) {
-		dev_dbg(&drv_data->pdev->dev,
-			"IO write error!\n");
-		message->state = ERROR_STATE;
-	} else {
-		/* Update total byte transferred */
-		message->actual_length += drv_data->len_in_bytes;
-		/* Move to next transfer of this msg */
-		message->state = bfin_spi_next_transfer(drv_data);
-		if (drv_data->cs_change)
-			bfin_spi_cs_deactive(drv_data, chip);
-	}
-
-	/* Schedule next transfer tasklet */
-	tasklet_schedule(&drv_data->pump_transfers);
-}
-
-/* pop a msg from queue and kick off real transfer */
-static void bfin_spi_pump_messages(struct work_struct *work)
-{
-	struct bfin_spi_master_data *drv_data;
-	unsigned long flags;
-
-	drv_data = container_of(work, struct bfin_spi_master_data, pump_messages);
-
-	/* Lock queue and check for queue work */
-	spin_lock_irqsave(&drv_data->lock, flags);
-	if (list_empty(&drv_data->queue) || !drv_data->running) {
-		/* pumper kicked off but no work to do */
-		drv_data->busy = 0;
-		spin_unlock_irqrestore(&drv_data->lock, flags);
-		return;
-	}
-
-	/* Make sure we are not already running a message */
-	if (drv_data->cur_msg) {
-		spin_unlock_irqrestore(&drv_data->lock, flags);
-		return;
-	}
-
-	/* Extract head of queue */
-	drv_data->cur_msg = list_entry(drv_data->queue.next,
-				       struct spi_message, queue);
-
-	/* Setup the SSP using the per chip configuration */
-	drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
-	bfin_spi_restore_state(drv_data);
-
-	list_del_init(&drv_data->cur_msg->queue);
-
-	/* Initial message state */
-	drv_data->cur_msg->state = START_STATE;
-	drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
-					    struct spi_transfer, transfer_list);
-
-	dev_dbg(&drv_data->pdev->dev, "got a message to pump, "
-		"state is set to: baud %d, flag 0x%x, ctl 0x%x\n",
-		drv_data->cur_chip->baud, drv_data->cur_chip->flag,
-		drv_data->cur_chip->ctl_reg);
-
-	dev_dbg(&drv_data->pdev->dev,
-		"the first transfer len is %d\n",
-		drv_data->cur_transfer->len);
-
-	/* Mark as busy and launch transfers */
-	tasklet_schedule(&drv_data->pump_transfers);
-
-	drv_data->busy = 1;
-	spin_unlock_irqrestore(&drv_data->lock, flags);
-}
-
-/*
- * got a msg to transfer, queue it in drv_data->queue.
- * And kick off message pumper
- */
-static int bfin_spi_transfer(struct spi_device *spi, struct spi_message *msg)
-{
-	struct bfin_spi_master_data *drv_data = spi_master_get_devdata(spi->master);
-	unsigned long flags;
-
-	spin_lock_irqsave(&drv_data->lock, flags);
-
-	if (!drv_data->running) {
-		spin_unlock_irqrestore(&drv_data->lock, flags);
-		return -ESHUTDOWN;
-	}
-
-	msg->actual_length = 0;
-	msg->status = -EINPROGRESS;
-	msg->state = START_STATE;
-
-	dev_dbg(&spi->dev, "adding an msg in transfer() \n");
-	list_add_tail(&msg->queue, &drv_data->queue);
-
-	if (drv_data->running && !drv_data->busy)
-		queue_work(drv_data->workqueue, &drv_data->pump_messages);
-
-	spin_unlock_irqrestore(&drv_data->lock, flags);
-
-	return 0;
-}
-
-#define MAX_SPI_SSEL	7
-
-static u16 ssel[][MAX_SPI_SSEL] = {
-	{P_SPI0_SSEL1, P_SPI0_SSEL2, P_SPI0_SSEL3,
-	P_SPI0_SSEL4, P_SPI0_SSEL5,
-	P_SPI0_SSEL6, P_SPI0_SSEL7},
-
-	{P_SPI1_SSEL1, P_SPI1_SSEL2, P_SPI1_SSEL3,
-	P_SPI1_SSEL4, P_SPI1_SSEL5,
-	P_SPI1_SSEL6, P_SPI1_SSEL7},
-
-	{P_SPI2_SSEL1, P_SPI2_SSEL2, P_SPI2_SSEL3,
-	P_SPI2_SSEL4, P_SPI2_SSEL5,
-	P_SPI2_SSEL6, P_SPI2_SSEL7},
-};
-
-/* setup for devices (may be called multiple times -- not just first setup) */
-static int bfin_spi_setup(struct spi_device *spi)
-{
-	struct bfin5xx_spi_chip *chip_info;
-	struct bfin_spi_slave_data *chip = NULL;
-	struct bfin_spi_master_data *drv_data = spi_master_get_devdata(spi->master);
-	u16 bfin_ctl_reg;
-	int ret = -EINVAL;
-
-	/* Only alloc (or use chip_info) on first setup */
-	chip_info = NULL;
-	chip = spi_get_ctldata(spi);
-	if (chip == NULL) {
-		chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-		if (!chip) {
-			dev_err(&spi->dev, "cannot allocate chip data\n");
-			ret = -ENOMEM;
-			goto error;
-		}
-
-		chip->enable_dma = 0;
-		chip_info = spi->controller_data;
-	}
-
-	/* Let people set non-standard bits directly */
-	bfin_ctl_reg = BIT_CTL_OPENDRAIN | BIT_CTL_EMISO |
-		BIT_CTL_PSSE | BIT_CTL_GM | BIT_CTL_SZ;
-
-	/* chip_info isn't always needed */
-	if (chip_info) {
-		/* Make sure people stop trying to set fields via ctl_reg
-		 * when they should actually be using common SPI framework.
-		 * Currently we let through: WOM EMISO PSSE GM SZ.
-		 * Not sure if a user actually needs/uses any of these,
-		 * but let's assume (for now) they do.
-		 */
-		if (chip_info->ctl_reg & ~bfin_ctl_reg) {
-			dev_err(&spi->dev, "do not set bits in ctl_reg "
-				"that the SPI framework manages\n");
-			goto error;
-		}
-		chip->enable_dma = chip_info->enable_dma != 0
-		    && drv_data->master_info->enable_dma;
-		chip->ctl_reg = chip_info->ctl_reg;
-		chip->cs_chg_udelay = chip_info->cs_chg_udelay;
-		chip->idle_tx_val = chip_info->idle_tx_val;
-		chip->pio_interrupt = chip_info->pio_interrupt;
-		spi->bits_per_word = chip_info->bits_per_word;
-	} else {
-		/* force a default base state */
-		chip->ctl_reg &= bfin_ctl_reg;
-	}
-
-	if (spi->bits_per_word % 8) {
-		dev_err(&spi->dev, "%d bits_per_word is not supported\n",
-				spi->bits_per_word);
-		goto error;
-	}
-
-	/* translate common spi framework into our register */
-	if (spi->mode & ~(SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST)) {
-		dev_err(&spi->dev, "unsupported spi modes detected\n");
-		goto error;
-	}
-	if (spi->mode & SPI_CPOL)
-		chip->ctl_reg |= BIT_CTL_CPOL;
-	if (spi->mode & SPI_CPHA)
-		chip->ctl_reg |= BIT_CTL_CPHA;
-	if (spi->mode & SPI_LSB_FIRST)
-		chip->ctl_reg |= BIT_CTL_LSBF;
-	/* we dont support running in slave mode (yet?) */
-	chip->ctl_reg |= BIT_CTL_MASTER;
-
-	/*
-	 * Notice: for blackfin, the speed_hz is the value of register
-	 * SPI_BAUD, not the real baudrate
-	 */
-	chip->baud = hz_to_spi_baud(spi->max_speed_hz);
-	chip->chip_select_num = spi->chip_select;
-	if (chip->chip_select_num < MAX_CTRL_CS) {
-		if (!(spi->mode & SPI_CPHA))
-			dev_warn(&spi->dev, "Warning: SPI CPHA not set:"
-				" Slave Select not under software control!\n"
-				" See Documentation/blackfin/bfin-spi-notes.txt");
-
-		chip->flag = (1 << spi->chip_select) << 8;
-	} else
-		chip->cs_gpio = chip->chip_select_num - MAX_CTRL_CS;
-
-	if (chip->enable_dma && chip->pio_interrupt) {
-		dev_err(&spi->dev, "enable_dma is set, "
-				"do not set pio_interrupt\n");
-		goto error;
-	}
-	/*
-	 * if any one SPI chip is registered and wants DMA, request the
-	 * DMA channel for it
-	 */
-	if (chip->enable_dma && !drv_data->dma_requested) {
-		/* register dma irq handler */
-		ret = request_dma(drv_data->dma_channel, "BFIN_SPI_DMA");
-		if (ret) {
-			dev_err(&spi->dev,
-				"Unable to request BlackFin SPI DMA channel\n");
-			goto error;
-		}
-		drv_data->dma_requested = 1;
-
-		ret = set_dma_callback(drv_data->dma_channel,
-			bfin_spi_dma_irq_handler, drv_data);
-		if (ret) {
-			dev_err(&spi->dev, "Unable to set dma callback\n");
-			goto error;
-		}
-		dma_disable_irq(drv_data->dma_channel);
-	}
-
-	if (chip->pio_interrupt && !drv_data->irq_requested) {
-		ret = request_irq(drv_data->spi_irq, bfin_spi_pio_irq_handler,
-			IRQF_DISABLED, "BFIN_SPI", drv_data);
-		if (ret) {
-			dev_err(&spi->dev, "Unable to register spi IRQ\n");
-			goto error;
-		}
-		drv_data->irq_requested = 1;
-		/* we use write mode, spi irq has to be disabled here */
-		disable_irq(drv_data->spi_irq);
-	}
-
-	if (chip->chip_select_num >= MAX_CTRL_CS) {
-		/* Only request on first setup */
-		if (spi_get_ctldata(spi) == NULL) {
-			ret = gpio_request(chip->cs_gpio, spi->modalias);
-			if (ret) {
-				dev_err(&spi->dev, "gpio_request() error\n");
-				goto pin_error;
-			}
-			gpio_direction_output(chip->cs_gpio, 1);
-		}
-	}
-
-	dev_dbg(&spi->dev, "setup spi chip %s, width is %d, dma is %d\n",
-			spi->modalias, spi->bits_per_word, chip->enable_dma);
-	dev_dbg(&spi->dev, "ctl_reg is 0x%x, flag_reg is 0x%x\n",
-			chip->ctl_reg, chip->flag);
-
-	spi_set_ctldata(spi, chip);
-
-	dev_dbg(&spi->dev, "chip select number is %d\n", chip->chip_select_num);
-	if (chip->chip_select_num < MAX_CTRL_CS) {
-		ret = peripheral_request(ssel[spi->master->bus_num]
-		                         [chip->chip_select_num-1], spi->modalias);
-		if (ret) {
-			dev_err(&spi->dev, "peripheral_request() error\n");
-			goto pin_error;
-		}
-	}
-
-	bfin_spi_cs_enable(drv_data, chip);
-	bfin_spi_cs_deactive(drv_data, chip);
-
-	return 0;
-
- pin_error:
-	if (chip->chip_select_num >= MAX_CTRL_CS)
-		gpio_free(chip->cs_gpio);
-	else
-		peripheral_free(ssel[spi->master->bus_num]
-			[chip->chip_select_num - 1]);
- error:
-	if (chip) {
-		if (drv_data->dma_requested)
-			free_dma(drv_data->dma_channel);
-		drv_data->dma_requested = 0;
-
-		kfree(chip);
-		/* prevent free 'chip' twice */
-		spi_set_ctldata(spi, NULL);
-	}
-
-	return ret;
-}
-
-/*
- * callback for spi framework.
- * clean driver specific data
- */
-static void bfin_spi_cleanup(struct spi_device *spi)
-{
-	struct bfin_spi_slave_data *chip = spi_get_ctldata(spi);
-	struct bfin_spi_master_data *drv_data = spi_master_get_devdata(spi->master);
-
-	if (!chip)
-		return;
-
-	if (chip->chip_select_num < MAX_CTRL_CS) {
-		peripheral_free(ssel[spi->master->bus_num]
-					[chip->chip_select_num-1]);
-		bfin_spi_cs_disable(drv_data, chip);
-	} else
-		gpio_free(chip->cs_gpio);
-
-	kfree(chip);
-	/* prevent free 'chip' twice */
-	spi_set_ctldata(spi, NULL);
-}
-
-static inline int bfin_spi_init_queue(struct bfin_spi_master_data *drv_data)
-{
-	INIT_LIST_HEAD(&drv_data->queue);
-	spin_lock_init(&drv_data->lock);
-
-	drv_data->running = false;
-	drv_data->busy = 0;
-
-	/* init transfer tasklet */
-	tasklet_init(&drv_data->pump_transfers,
-		     bfin_spi_pump_transfers, (unsigned long)drv_data);
-
-	/* init messages workqueue */
-	INIT_WORK(&drv_data->pump_messages, bfin_spi_pump_messages);
-	drv_data->workqueue = create_singlethread_workqueue(
-				dev_name(drv_data->master->dev.parent));
-	if (drv_data->workqueue == NULL)
-		return -EBUSY;
-
-	return 0;
-}
-
-static inline int bfin_spi_start_queue(struct bfin_spi_master_data *drv_data)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&drv_data->lock, flags);
-
-	if (drv_data->running || drv_data->busy) {
-		spin_unlock_irqrestore(&drv_data->lock, flags);
-		return -EBUSY;
-	}
-
-	drv_data->running = true;
-	drv_data->cur_msg = NULL;
-	drv_data->cur_transfer = NULL;
-	drv_data->cur_chip = NULL;
-	spin_unlock_irqrestore(&drv_data->lock, flags);
-
-	queue_work(drv_data->workqueue, &drv_data->pump_messages);
-
-	return 0;
-}
-
-static inline int bfin_spi_stop_queue(struct bfin_spi_master_data *drv_data)
-{
-	unsigned long flags;
-	unsigned limit = 500;
-	int status = 0;
-
-	spin_lock_irqsave(&drv_data->lock, flags);
-
-	/*
-	 * This is a bit lame, but is optimized for the common execution path.
-	 * A wait_queue on the drv_data->busy could be used, but then the common
-	 * execution path (pump_messages) would be required to call wake_up or
-	 * friends on every SPI message. Do this instead
-	 */
-	drv_data->running = false;
-	while ((!list_empty(&drv_data->queue) || drv_data->busy) && limit--) {
-		spin_unlock_irqrestore(&drv_data->lock, flags);
-		msleep(10);
-		spin_lock_irqsave(&drv_data->lock, flags);
-	}
-
-	if (!list_empty(&drv_data->queue) || drv_data->busy)
-		status = -EBUSY;
-
-	spin_unlock_irqrestore(&drv_data->lock, flags);
-
-	return status;
-}
-
-static inline int bfin_spi_destroy_queue(struct bfin_spi_master_data *drv_data)
-{
-	int status;
-
-	status = bfin_spi_stop_queue(drv_data);
-	if (status != 0)
-		return status;
-
-	destroy_workqueue(drv_data->workqueue);
-
-	return 0;
-}
-
-static int __init bfin_spi_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct bfin5xx_spi_master *platform_info;
-	struct spi_master *master;
-	struct bfin_spi_master_data *drv_data;
-	struct resource *res;
-	int status = 0;
-
-	platform_info = dev->platform_data;
-
-	/* Allocate master with space for drv_data */
-	master = spi_alloc_master(dev, sizeof(*drv_data));
-	if (!master) {
-		dev_err(&pdev->dev, "can not alloc spi_master\n");
-		return -ENOMEM;
-	}
-
-	drv_data = spi_master_get_devdata(master);
-	drv_data->master = master;
-	drv_data->master_info = platform_info;
-	drv_data->pdev = pdev;
-	drv_data->pin_req = platform_info->pin_req;
-
-	/* the spi->mode bits supported by this driver: */
-	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
-
-	master->bus_num = pdev->id;
-	master->num_chipselect = platform_info->num_chipselect;
-	master->cleanup = bfin_spi_cleanup;
-	master->setup = bfin_spi_setup;
-	master->transfer = bfin_spi_transfer;
-
-	/* Find and map our resources */
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res == NULL) {
-		dev_err(dev, "Cannot get IORESOURCE_MEM\n");
-		status = -ENOENT;
-		goto out_error_get_res;
-	}
-
-	drv_data->regs_base = ioremap(res->start, resource_size(res));
-	if (drv_data->regs_base == NULL) {
-		dev_err(dev, "Cannot map IO\n");
-		status = -ENXIO;
-		goto out_error_ioremap;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (res == NULL) {
-		dev_err(dev, "No DMA channel specified\n");
-		status = -ENOENT;
-		goto out_error_free_io;
-	}
-	drv_data->dma_channel = res->start;
-
-	drv_data->spi_irq = platform_get_irq(pdev, 0);
-	if (drv_data->spi_irq < 0) {
-		dev_err(dev, "No spi pio irq specified\n");
-		status = -ENOENT;
-		goto out_error_free_io;
-	}
-
-	/* Initial and start queue */
-	status = bfin_spi_init_queue(drv_data);
-	if (status != 0) {
-		dev_err(dev, "problem initializing queue\n");
-		goto out_error_queue_alloc;
-	}
-
-	status = bfin_spi_start_queue(drv_data);
-	if (status != 0) {
-		dev_err(dev, "problem starting queue\n");
-		goto out_error_queue_alloc;
-	}
-
-	status = peripheral_request_list(drv_data->pin_req, DRV_NAME);
-	if (status != 0) {
-		dev_err(&pdev->dev, ": Requesting Peripherals failed\n");
-		goto out_error_queue_alloc;
-	}
-
-	/* Reset SPI registers. If these registers were used by the boot loader,
-	 * the sky may fall on your head if you enable the dma controller.
-	 */
-	write_CTRL(drv_data, BIT_CTL_CPHA | BIT_CTL_MASTER);
-	write_FLAG(drv_data, 0xFF00);
-
-	/* Register with the SPI framework */
-	platform_set_drvdata(pdev, drv_data);
-	status = spi_register_master(master);
-	if (status != 0) {
-		dev_err(dev, "problem registering spi master\n");
-		goto out_error_queue_alloc;
-	}
-
-	dev_info(dev, "%s, Version %s, regs_base@%p, dma channel@%d\n",
-		DRV_DESC, DRV_VERSION, drv_data->regs_base,
-		drv_data->dma_channel);
-	return status;
-
-out_error_queue_alloc:
-	bfin_spi_destroy_queue(drv_data);
-out_error_free_io:
-	iounmap((void *) drv_data->regs_base);
-out_error_ioremap:
-out_error_get_res:
-	spi_master_put(master);
-
-	return status;
-}
-
-/* stop hardware and remove the driver */
-static int __devexit bfin_spi_remove(struct platform_device *pdev)
-{
-	struct bfin_spi_master_data *drv_data = platform_get_drvdata(pdev);
-	int status = 0;
-
-	if (!drv_data)
-		return 0;
-
-	/* Remove the queue */
-	status = bfin_spi_destroy_queue(drv_data);
-	if (status != 0)
-		return status;
-
-	/* Disable the SSP at the peripheral and SOC level */
-	bfin_spi_disable(drv_data);
-
-	/* Release DMA */
-	if (drv_data->master_info->enable_dma) {
-		if (dma_channel_active(drv_data->dma_channel))
-			free_dma(drv_data->dma_channel);
-	}
-
-	if (drv_data->irq_requested) {
-		free_irq(drv_data->spi_irq, drv_data);
-		drv_data->irq_requested = 0;
-	}
-
-	/* Disconnect from the SPI framework */
-	spi_unregister_master(drv_data->master);
-
-	peripheral_free_list(drv_data->pin_req);
-
-	/* Prevent double remove */
-	platform_set_drvdata(pdev, NULL);
-
-	return 0;
-}
-
-#ifdef CONFIG_PM
-static int bfin_spi_suspend(struct platform_device *pdev, pm_message_t state)
-{
-	struct bfin_spi_master_data *drv_data = platform_get_drvdata(pdev);
-	int status = 0;
-
-	status = bfin_spi_stop_queue(drv_data);
-	if (status != 0)
-		return status;
-
-	drv_data->ctrl_reg = read_CTRL(drv_data);
-	drv_data->flag_reg = read_FLAG(drv_data);
-
-	/*
-	 * reset SPI_CTL and SPI_FLG registers
-	 */
-	write_CTRL(drv_data, BIT_CTL_CPHA | BIT_CTL_MASTER);
-	write_FLAG(drv_data, 0xFF00);
-
-	return 0;
-}
-
-static int bfin_spi_resume(struct platform_device *pdev)
-{
-	struct bfin_spi_master_data *drv_data = platform_get_drvdata(pdev);
-	int status = 0;
-
-	write_CTRL(drv_data, drv_data->ctrl_reg);
-	write_FLAG(drv_data, drv_data->flag_reg);
-
-	/* Start the queue running */
-	status = bfin_spi_start_queue(drv_data);
-	if (status != 0) {
-		dev_err(&pdev->dev, "problem starting queue (%d)\n", status);
-		return status;
-	}
-
-	return 0;
-}
-#else
-#define bfin_spi_suspend NULL
-#define bfin_spi_resume NULL
-#endif				/* CONFIG_PM */
-
-MODULE_ALIAS("platform:bfin-spi");
-static struct platform_driver bfin_spi_driver = {
-	.driver	= {
-		.name	= DRV_NAME,
-		.owner	= THIS_MODULE,
-	},
-	.suspend	= bfin_spi_suspend,
-	.resume		= bfin_spi_resume,
-	.remove		= __devexit_p(bfin_spi_remove),
-};
-
-static int __init bfin_spi_init(void)
-{
-	return platform_driver_probe(&bfin_spi_driver, bfin_spi_probe);
-}
-subsys_initcall(bfin_spi_init);
-
-static void __exit bfin_spi_exit(void)
-{
-	platform_driver_unregister(&bfin_spi_driver);
-}
-module_exit(bfin_spi_exit);