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, 938 deletions

diff --git a/drivers/spi/ep93xx_spi.c b/drivers/spi/ep93xx_spi.c
deleted file mode 100644
index d3570071e98..00000000000
--- a/drivers/spi/ep93xx_spi.c
+++ /dev/null
@@ -1,938 +0,0 @@
-/*
- * Driver for Cirrus Logic EP93xx SPI controller.
- *
- * Copyright (c) 2010 Mika Westerberg
- *
- * Explicit FIFO handling code was inspired by amba-pl022 driver.
- *
- * Chip select support using other than built-in GPIOs by H. Hartley Sweeten.
- *
- * For more information about the SPI controller see documentation on Cirrus
- * Logic web site:
- *     http://www.cirrus.com/en/pubs/manual/EP93xx_Users_Guide_UM1.pdf
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/io.h>
-#include <linux/clk.h>
-#include <linux/err.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/bitops.h>
-#include <linux/interrupt.h>
-#include <linux/platform_device.h>
-#include <linux/workqueue.h>
-#include <linux/sched.h>
-#include <linux/spi/spi.h>
-
-#include <mach/ep93xx_spi.h>
-
-#define SSPCR0			0x0000
-#define SSPCR0_MODE_SHIFT	6
-#define SSPCR0_SCR_SHIFT	8
-
-#define SSPCR1			0x0004
-#define SSPCR1_RIE		BIT(0)
-#define SSPCR1_TIE		BIT(1)
-#define SSPCR1_RORIE		BIT(2)
-#define SSPCR1_LBM		BIT(3)
-#define SSPCR1_SSE		BIT(4)
-#define SSPCR1_MS		BIT(5)
-#define SSPCR1_SOD		BIT(6)
-
-#define SSPDR			0x0008
-
-#define SSPSR			0x000c
-#define SSPSR_TFE		BIT(0)
-#define SSPSR_TNF		BIT(1)
-#define SSPSR_RNE		BIT(2)
-#define SSPSR_RFF		BIT(3)
-#define SSPSR_BSY		BIT(4)
-#define SSPCPSR			0x0010
-
-#define SSPIIR			0x0014
-#define SSPIIR_RIS		BIT(0)
-#define SSPIIR_TIS		BIT(1)
-#define SSPIIR_RORIS		BIT(2)
-#define SSPICR			SSPIIR
-
-/* timeout in milliseconds */
-#define SPI_TIMEOUT		5
-/* maximum depth of RX/TX FIFO */
-#define SPI_FIFO_SIZE		8
-
-/**
- * struct ep93xx_spi - EP93xx SPI controller structure
- * @lock: spinlock that protects concurrent accesses to fields @running,
- *        @current_msg and @msg_queue
- * @pdev: pointer to platform device
- * @clk: clock for the controller
- * @regs_base: pointer to ioremap()'d registers
- * @irq: IRQ number used by the driver
- * @min_rate: minimum clock rate (in Hz) supported by the controller
- * @max_rate: maximum clock rate (in Hz) supported by the controller
- * @running: is the queue running
- * @wq: workqueue used by the driver
- * @msg_work: work that is queued for the driver
- * @wait: wait here until given transfer is completed
- * @msg_queue: queue for the messages
- * @current_msg: message that is currently processed (or %NULL if none)
- * @tx: current byte in transfer to transmit
- * @rx: current byte in transfer to receive
- * @fifo_level: how full is FIFO (%0..%SPI_FIFO_SIZE - %1). Receiving one
- *              frame decreases this level and sending one frame increases it.
- *
- * This structure holds EP93xx SPI controller specific information. When
- * @running is %true, driver accepts transfer requests from protocol drivers.
- * @current_msg is used to hold pointer to the message that is currently
- * processed. If @current_msg is %NULL, it means that no processing is going
- * on.
- *
- * Most of the fields are only written once and they can be accessed without
- * taking the @lock. Fields that are accessed concurrently are: @current_msg,
- * @running, and @msg_queue.
- */
-struct ep93xx_spi {
-	spinlock_t			lock;
-	const struct platform_device	*pdev;
-	struct clk			*clk;
-	void __iomem			*regs_base;
-	int				irq;
-	unsigned long			min_rate;
-	unsigned long			max_rate;
-	bool				running;
-	struct workqueue_struct		*wq;
-	struct work_struct		msg_work;
-	struct completion		wait;
-	struct list_head		msg_queue;
-	struct spi_message		*current_msg;
-	size_t				tx;
-	size_t				rx;
-	size_t				fifo_level;
-};
-
-/**
- * struct ep93xx_spi_chip - SPI device hardware settings
- * @spi: back pointer to the SPI device
- * @rate: max rate in hz this chip supports
- * @div_cpsr: cpsr (pre-scaler) divider
- * @div_scr: scr divider
- * @dss: bits per word (4 - 16 bits)
- * @ops: private chip operations
- *
- * This structure is used to store hardware register specific settings for each
- * SPI device. Settings are written to hardware by function
- * ep93xx_spi_chip_setup().
- */
-struct ep93xx_spi_chip {
-	const struct spi_device		*spi;
-	unsigned long			rate;
-	u8				div_cpsr;
-	u8				div_scr;
-	u8				dss;
-	struct ep93xx_spi_chip_ops	*ops;
-};
-
-/* converts bits per word to CR0.DSS value */
-#define bits_per_word_to_dss(bpw)	((bpw) - 1)
-
-static inline void
-ep93xx_spi_write_u8(const struct ep93xx_spi *espi, u16 reg, u8 value)
-{
-	__raw_writeb(value, espi->regs_base + reg);
-}
-
-static inline u8
-ep93xx_spi_read_u8(const struct ep93xx_spi *spi, u16 reg)
-{
-	return __raw_readb(spi->regs_base + reg);
-}
-
-static inline void
-ep93xx_spi_write_u16(const struct ep93xx_spi *espi, u16 reg, u16 value)
-{
-	__raw_writew(value, espi->regs_base + reg);
-}
-
-static inline u16
-ep93xx_spi_read_u16(const struct ep93xx_spi *spi, u16 reg)
-{
-	return __raw_readw(spi->regs_base + reg);
-}
-
-static int ep93xx_spi_enable(const struct ep93xx_spi *espi)
-{
-	u8 regval;
-	int err;
-
-	err = clk_enable(espi->clk);
-	if (err)
-		return err;
-
-	regval = ep93xx_spi_read_u8(espi, SSPCR1);
-	regval |= SSPCR1_SSE;
-	ep93xx_spi_write_u8(espi, SSPCR1, regval);
-
-	return 0;
-}
-
-static void ep93xx_spi_disable(const struct ep93xx_spi *espi)
-{
-	u8 regval;
-
-	regval = ep93xx_spi_read_u8(espi, SSPCR1);
-	regval &= ~SSPCR1_SSE;
-	ep93xx_spi_write_u8(espi, SSPCR1, regval);
-
-	clk_disable(espi->clk);
-}
-
-static void ep93xx_spi_enable_interrupts(const struct ep93xx_spi *espi)
-{
-	u8 regval;
-
-	regval = ep93xx_spi_read_u8(espi, SSPCR1);
-	regval |= (SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
-	ep93xx_spi_write_u8(espi, SSPCR1, regval);
-}
-
-static void ep93xx_spi_disable_interrupts(const struct ep93xx_spi *espi)
-{
-	u8 regval;
-
-	regval = ep93xx_spi_read_u8(espi, SSPCR1);
-	regval &= ~(SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
-	ep93xx_spi_write_u8(espi, SSPCR1, regval);
-}
-
-/**
- * ep93xx_spi_calc_divisors() - calculates SPI clock divisors
- * @espi: ep93xx SPI controller struct
- * @chip: divisors are calculated for this chip
- * @rate: desired SPI output clock rate
- *
- * Function calculates cpsr (clock pre-scaler) and scr divisors based on
- * given @rate and places them to @chip->div_cpsr and @chip->div_scr. If,
- * for some reason, divisors cannot be calculated nothing is stored and
- * %-EINVAL is returned.
- */
-static int ep93xx_spi_calc_divisors(const struct ep93xx_spi *espi,
-				    struct ep93xx_spi_chip *chip,
-				    unsigned long rate)
-{
-	unsigned long spi_clk_rate = clk_get_rate(espi->clk);
-	int cpsr, scr;
-
-	/*
-	 * Make sure that max value is between values supported by the
-	 * controller. Note that minimum value is already checked in
-	 * ep93xx_spi_transfer().
-	 */
-	rate = clamp(rate, espi->min_rate, espi->max_rate);
-
-	/*
-	 * Calculate divisors so that we can get speed according the
-	 * following formula:
-	 *	rate = spi_clock_rate / (cpsr * (1 + scr))
-	 *
-	 * cpsr must be even number and starts from 2, scr can be any number
-	 * between 0 and 255.
-	 */
-	for (cpsr = 2; cpsr <= 254; cpsr += 2) {
-		for (scr = 0; scr <= 255; scr++) {
-			if ((spi_clk_rate / (cpsr * (scr + 1))) <= rate) {
-				chip->div_scr = (u8)scr;
-				chip->div_cpsr = (u8)cpsr;
-				return 0;
-			}
-		}
-	}
-
-	return -EINVAL;
-}
-
-static void ep93xx_spi_cs_control(struct spi_device *spi, bool control)
-{
-	struct ep93xx_spi_chip *chip = spi_get_ctldata(spi);
-	int value = (spi->mode & SPI_CS_HIGH) ? control : !control;
-
-	if (chip->ops && chip->ops->cs_control)
-		chip->ops->cs_control(spi, value);
-}
-
-/**
- * ep93xx_spi_setup() - setup an SPI device
- * @spi: SPI device to setup
- *
- * This function sets up SPI device mode, speed etc. Can be called multiple
- * times for a single device. Returns %0 in case of success, negative error in
- * case of failure. When this function returns success, the device is
- * deselected.
- */
-static int ep93xx_spi_setup(struct spi_device *spi)
-{
-	struct ep93xx_spi *espi = spi_master_get_devdata(spi->master);
-	struct ep93xx_spi_chip *chip;
-
-	if (spi->bits_per_word < 4 || spi->bits_per_word > 16) {
-		dev_err(&espi->pdev->dev, "invalid bits per word %d\n",
-			spi->bits_per_word);
-		return -EINVAL;
-	}
-
-	chip = spi_get_ctldata(spi);
-	if (!chip) {
-		dev_dbg(&espi->pdev->dev, "initial setup for %s\n",
-			spi->modalias);
-
-		chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-		if (!chip)
-			return -ENOMEM;
-
-		chip->spi = spi;
-		chip->ops = spi->controller_data;
-
-		if (chip->ops && chip->ops->setup) {
-			int ret = chip->ops->setup(spi);
-			if (ret) {
-				kfree(chip);
-				return ret;
-			}
-		}
-
-		spi_set_ctldata(spi, chip);
-	}
-
-	if (spi->max_speed_hz != chip->rate) {
-		int err;
-
-		err = ep93xx_spi_calc_divisors(espi, chip, spi->max_speed_hz);
-		if (err != 0) {
-			spi_set_ctldata(spi, NULL);
-			kfree(chip);
-			return err;
-		}
-		chip->rate = spi->max_speed_hz;
-	}
-
-	chip->dss = bits_per_word_to_dss(spi->bits_per_word);
-
-	ep93xx_spi_cs_control(spi, false);
-	return 0;
-}
-
-/**
- * ep93xx_spi_transfer() - queue message to be transferred
- * @spi: target SPI device
- * @msg: message to be transferred
- *
- * This function is called by SPI device drivers when they are going to transfer
- * a new message. It simply puts the message in the queue and schedules
- * workqueue to perform the actual transfer later on.
- *
- * Returns %0 on success and negative error in case of failure.
- */
-static int ep93xx_spi_transfer(struct spi_device *spi, struct spi_message *msg)
-{
-	struct ep93xx_spi *espi = spi_master_get_devdata(spi->master);
-	struct spi_transfer *t;
-	unsigned long flags;
-
-	if (!msg || !msg->complete)
-		return -EINVAL;
-
-	/* first validate each transfer */
-	list_for_each_entry(t, &msg->transfers, transfer_list) {
-		if (t->bits_per_word) {
-			if (t->bits_per_word < 4 || t->bits_per_word > 16)
-				return -EINVAL;
-		}
-		if (t->speed_hz && t->speed_hz < espi->min_rate)
-				return -EINVAL;
-	}
-
-	/*
-	 * Now that we own the message, let's initialize it so that it is
-	 * suitable for us. We use @msg->status to signal whether there was
-	 * error in transfer and @msg->state is used to hold pointer to the
-	 * current transfer (or %NULL if no active current transfer).
-	 */
-	msg->state = NULL;
-	msg->status = 0;
-	msg->actual_length = 0;
-
-	spin_lock_irqsave(&espi->lock, flags);
-	if (!espi->running) {
-		spin_unlock_irqrestore(&espi->lock, flags);
-		return -ESHUTDOWN;
-	}
-	list_add_tail(&msg->queue, &espi->msg_queue);
-	queue_work(espi->wq, &espi->msg_work);
-	spin_unlock_irqrestore(&espi->lock, flags);
-
-	return 0;
-}
-
-/**
- * ep93xx_spi_cleanup() - cleans up master controller specific state
- * @spi: SPI device to cleanup
- *
- * This function releases master controller specific state for given @spi
- * device.
- */
-static void ep93xx_spi_cleanup(struct spi_device *spi)
-{
-	struct ep93xx_spi_chip *chip;
-
-	chip = spi_get_ctldata(spi);
-	if (chip) {
-		if (chip->ops && chip->ops->cleanup)
-			chip->ops->cleanup(spi);
-		spi_set_ctldata(spi, NULL);
-		kfree(chip);
-	}
-}
-
-/**
- * ep93xx_spi_chip_setup() - configures hardware according to given @chip
- * @espi: ep93xx SPI controller struct
- * @chip: chip specific settings
- *
- * This function sets up the actual hardware registers with settings given in
- * @chip. Note that no validation is done so make sure that callers validate
- * settings before calling this.
- */
-static void ep93xx_spi_chip_setup(const struct ep93xx_spi *espi,
-				  const struct ep93xx_spi_chip *chip)
-{
-	u16 cr0;
-
-	cr0 = chip->div_scr << SSPCR0_SCR_SHIFT;
-	cr0 |= (chip->spi->mode & (SPI_CPHA|SPI_CPOL)) << SSPCR0_MODE_SHIFT;
-	cr0 |= chip->dss;
-
-	dev_dbg(&espi->pdev->dev, "setup: mode %d, cpsr %d, scr %d, dss %d\n",
-		chip->spi->mode, chip->div_cpsr, chip->div_scr, chip->dss);
-	dev_dbg(&espi->pdev->dev, "setup: cr0 %#x", cr0);
-
-	ep93xx_spi_write_u8(espi, SSPCPSR, chip->div_cpsr);
-	ep93xx_spi_write_u16(espi, SSPCR0, cr0);
-}
-
-static inline int bits_per_word(const struct ep93xx_spi *espi)
-{
-	struct spi_message *msg = espi->current_msg;
-	struct spi_transfer *t = msg->state;
-
-	return t->bits_per_word ? t->bits_per_word : msg->spi->bits_per_word;
-}
-
-static void ep93xx_do_write(struct ep93xx_spi *espi, struct spi_transfer *t)
-{
-	if (bits_per_word(espi) > 8) {
-		u16 tx_val = 0;
-
-		if (t->tx_buf)
-			tx_val = ((u16 *)t->tx_buf)[espi->tx];
-		ep93xx_spi_write_u16(espi, SSPDR, tx_val);
-		espi->tx += sizeof(tx_val);
-	} else {
-		u8 tx_val = 0;
-
-		if (t->tx_buf)
-			tx_val = ((u8 *)t->tx_buf)[espi->tx];
-		ep93xx_spi_write_u8(espi, SSPDR, tx_val);
-		espi->tx += sizeof(tx_val);
-	}
-}
-
-static void ep93xx_do_read(struct ep93xx_spi *espi, struct spi_transfer *t)
-{
-	if (bits_per_word(espi) > 8) {
-		u16 rx_val;
-
-		rx_val = ep93xx_spi_read_u16(espi, SSPDR);
-		if (t->rx_buf)
-			((u16 *)t->rx_buf)[espi->rx] = rx_val;
-		espi->rx += sizeof(rx_val);
-	} else {
-		u8 rx_val;
-
-		rx_val = ep93xx_spi_read_u8(espi, SSPDR);
-		if (t->rx_buf)
-			((u8 *)t->rx_buf)[espi->rx] = rx_val;
-		espi->rx += sizeof(rx_val);
-	}
-}
-
-/**
- * ep93xx_spi_read_write() - perform next RX/TX transfer
- * @espi: ep93xx SPI controller struct
- *
- * This function transfers next bytes (or half-words) to/from RX/TX FIFOs. If
- * called several times, the whole transfer will be completed. Returns
- * %-EINPROGRESS when current transfer was not yet completed otherwise %0.
- *
- * When this function is finished, RX FIFO should be empty and TX FIFO should be
- * full.
- */
-static int ep93xx_spi_read_write(struct ep93xx_spi *espi)
-{
-	struct spi_message *msg = espi->current_msg;
-	struct spi_transfer *t = msg->state;
-
-	/* read as long as RX FIFO has frames in it */
-	while ((ep93xx_spi_read_u8(espi, SSPSR) & SSPSR_RNE)) {
-		ep93xx_do_read(espi, t);
-		espi->fifo_level--;
-	}
-
-	/* write as long as TX FIFO has room */
-	while (espi->fifo_level < SPI_FIFO_SIZE && espi->tx < t->len) {
-		ep93xx_do_write(espi, t);
-		espi->fifo_level++;
-	}
-
-	if (espi->rx == t->len) {
-		msg->actual_length += t->len;
-		return 0;
-	}
-
-	return -EINPROGRESS;
-}
-
-/**
- * ep93xx_spi_process_transfer() - processes one SPI transfer
- * @espi: ep93xx SPI controller struct
- * @msg: current message
- * @t: transfer to process
- *
- * This function processes one SPI transfer given in @t. Function waits until
- * transfer is complete (may sleep) and updates @msg->status based on whether
- * transfer was successfully processed or not.
- */
-static void ep93xx_spi_process_transfer(struct ep93xx_spi *espi,
-					struct spi_message *msg,
-					struct spi_transfer *t)
-{
-	struct ep93xx_spi_chip *chip = spi_get_ctldata(msg->spi);
-
-	msg->state = t;
-
-	/*
-	 * Handle any transfer specific settings if needed. We use
-	 * temporary chip settings here and restore original later when
-	 * the transfer is finished.
-	 */
-	if (t->speed_hz || t->bits_per_word) {
-		struct ep93xx_spi_chip tmp_chip = *chip;
-
-		if (t->speed_hz) {
-			int err;
-
-			err = ep93xx_spi_calc_divisors(espi, &tmp_chip,
-						       t->speed_hz);
-			if (err) {
-				dev_err(&espi->pdev->dev,
-					"failed to adjust speed\n");
-				msg->status = err;
-				return;
-			}
-		}
-
-		if (t->bits_per_word)
-			tmp_chip.dss = bits_per_word_to_dss(t->bits_per_word);
-
-		/*
-		 * Set up temporary new hw settings for this transfer.
-		 */
-		ep93xx_spi_chip_setup(espi, &tmp_chip);
-	}
-
-	espi->rx = 0;
-	espi->tx = 0;
-
-	/*
-	 * Now everything is set up for the current transfer. We prime the TX
-	 * FIFO, enable interrupts, and wait for the transfer to complete.
-	 */
-	if (ep93xx_spi_read_write(espi)) {
-		ep93xx_spi_enable_interrupts(espi);
-		wait_for_completion(&espi->wait);
-	}
-
-	/*
-	 * In case of error during transmit, we bail out from processing
-	 * the message.
-	 */
-	if (msg->status)
-		return;
-
-	/*
-	 * After this transfer is finished, perform any possible
-	 * post-transfer actions requested by the protocol driver.
-	 */
-	if (t->delay_usecs) {
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		schedule_timeout(usecs_to_jiffies(t->delay_usecs));
-	}
-	if (t->cs_change) {
-		if (!list_is_last(&t->transfer_list, &msg->transfers)) {
-			/*
-			 * In case protocol driver is asking us to drop the
-			 * chipselect briefly, we let the scheduler to handle
-			 * any "delay" here.
-			 */
-			ep93xx_spi_cs_control(msg->spi, false);
-			cond_resched();
-			ep93xx_spi_cs_control(msg->spi, true);
-		}
-	}
-
-	if (t->speed_hz || t->bits_per_word)
-		ep93xx_spi_chip_setup(espi, chip);
-}
-
-/*
- * ep93xx_spi_process_message() - process one SPI message
- * @espi: ep93xx SPI controller struct
- * @msg: message to process
- *
- * This function processes a single SPI message. We go through all transfers in
- * the message and pass them to ep93xx_spi_process_transfer(). Chipselect is
- * asserted during the whole message (unless per transfer cs_change is set).
- *
- * @msg->status contains %0 in case of success or negative error code in case of
- * failure.
- */
-static void ep93xx_spi_process_message(struct ep93xx_spi *espi,
-				       struct spi_message *msg)
-{
-	unsigned long timeout;
-	struct spi_transfer *t;
-	int err;
-
-	/*
-	 * Enable the SPI controller and its clock.
-	 */
-	err = ep93xx_spi_enable(espi);
-	if (err) {
-		dev_err(&espi->pdev->dev, "failed to enable SPI controller\n");
-		msg->status = err;
-		return;
-	}
-
-	/*
-	 * Just to be sure: flush any data from RX FIFO.
-	 */
-	timeout = jiffies + msecs_to_jiffies(SPI_TIMEOUT);
-	while (ep93xx_spi_read_u16(espi, SSPSR) & SSPSR_RNE) {
-		if (time_after(jiffies, timeout)) {
-			dev_warn(&espi->pdev->dev,
-				 "timeout while flushing RX FIFO\n");
-			msg->status = -ETIMEDOUT;
-			return;
-		}
-		ep93xx_spi_read_u16(espi, SSPDR);
-	}
-
-	/*
-	 * We explicitly handle FIFO level. This way we don't have to check TX
-	 * FIFO status using %SSPSR_TNF bit which may cause RX FIFO overruns.
-	 */
-	espi->fifo_level = 0;
-
-	/*
-	 * Update SPI controller registers according to spi device and assert
-	 * the chipselect.
-	 */
-	ep93xx_spi_chip_setup(espi, spi_get_ctldata(msg->spi));
-	ep93xx_spi_cs_control(msg->spi, true);
-
-	list_for_each_entry(t, &msg->transfers, transfer_list) {
-		ep93xx_spi_process_transfer(espi, msg, t);
-		if (msg->status)
-			break;
-	}
-
-	/*
-	 * Now the whole message is transferred (or failed for some reason). We
-	 * deselect the device and disable the SPI controller.
-	 */
-	ep93xx_spi_cs_control(msg->spi, false);
-	ep93xx_spi_disable(espi);
-}
-
-#define work_to_espi(work) (container_of((work), struct ep93xx_spi, msg_work))
-
-/**
- * ep93xx_spi_work() - EP93xx SPI workqueue worker function
- * @work: work struct
- *
- * Workqueue worker function. This function is called when there are new
- * SPI messages to be processed. Message is taken out from the queue and then
- * passed to ep93xx_spi_process_message().
- *
- * After message is transferred, protocol driver is notified by calling
- * @msg->complete(). In case of error, @msg->status is set to negative error
- * number, otherwise it contains zero (and @msg->actual_length is updated).
- */
-static void ep93xx_spi_work(struct work_struct *work)
-{
-	struct ep93xx_spi *espi = work_to_espi(work);
-	struct spi_message *msg;
-
-	spin_lock_irq(&espi->lock);
-	if (!espi->running || espi->current_msg ||
-		list_empty(&espi->msg_queue)) {
-		spin_unlock_irq(&espi->lock);
-		return;
-	}
-	msg = list_first_entry(&espi->msg_queue, struct spi_message, queue);
-	list_del_init(&msg->queue);
-	espi->current_msg = msg;
-	spin_unlock_irq(&espi->lock);
-
-	ep93xx_spi_process_message(espi, msg);
-
-	/*
-	 * Update the current message and re-schedule ourselves if there are
-	 * more messages in the queue.
-	 */
-	spin_lock_irq(&espi->lock);
-	espi->current_msg = NULL;
-	if (espi->running && !list_empty(&espi->msg_queue))
-		queue_work(espi->wq, &espi->msg_work);
-	spin_unlock_irq(&espi->lock);
-
-	/* notify the protocol driver that we are done with this message */
-	msg->complete(msg->context);
-}
-
-static irqreturn_t ep93xx_spi_interrupt(int irq, void *dev_id)
-{
-	struct ep93xx_spi *espi = dev_id;
-	u8 irq_status = ep93xx_spi_read_u8(espi, SSPIIR);
-
-	/*
-	 * If we got ROR (receive overrun) interrupt we know that something is
-	 * wrong. Just abort the message.
-	 */
-	if (unlikely(irq_status & SSPIIR_RORIS)) {
-		/* clear the overrun interrupt */
-		ep93xx_spi_write_u8(espi, SSPICR, 0);
-		dev_warn(&espi->pdev->dev,
-			 "receive overrun, aborting the message\n");
-		espi->current_msg->status = -EIO;
-	} else {
-		/*
-		 * Interrupt is either RX (RIS) or TX (TIS). For both cases we
-		 * simply execute next data transfer.
-		 */
-		if (ep93xx_spi_read_write(espi)) {
-			/*
-			 * In normal case, there still is some processing left
-			 * for current transfer. Let's wait for the next
-			 * interrupt then.
-			 */
-			return IRQ_HANDLED;
-		}
-	}
-
-	/*
-	 * Current transfer is finished, either with error or with success. In
-	 * any case we disable interrupts and notify the worker to handle
-	 * any post-processing of the message.
-	 */
-	ep93xx_spi_disable_interrupts(espi);
-	complete(&espi->wait);
-	return IRQ_HANDLED;
-}
-
-static int __init ep93xx_spi_probe(struct platform_device *pdev)
-{
-	struct spi_master *master;
-	struct ep93xx_spi_info *info;
-	struct ep93xx_spi *espi;
-	struct resource *res;
-	int error;
-
-	info = pdev->dev.platform_data;
-
-	master = spi_alloc_master(&pdev->dev, sizeof(*espi));
-	if (!master) {
-		dev_err(&pdev->dev, "failed to allocate spi master\n");
-		return -ENOMEM;
-	}
-
-	master->setup = ep93xx_spi_setup;
-	master->transfer = ep93xx_spi_transfer;
-	master->cleanup = ep93xx_spi_cleanup;
-	master->bus_num = pdev->id;
-	master->num_chipselect = info->num_chipselect;
-	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
-
-	platform_set_drvdata(pdev, master);
-
-	espi = spi_master_get_devdata(master);
-
-	espi->clk = clk_get(&pdev->dev, NULL);
-	if (IS_ERR(espi->clk)) {
-		dev_err(&pdev->dev, "unable to get spi clock\n");
-		error = PTR_ERR(espi->clk);
-		goto fail_release_master;
-	}
-
-	spin_lock_init(&espi->lock);
-	init_completion(&espi->wait);
-
-	/*
-	 * Calculate maximum and minimum supported clock rates
-	 * for the controller.
-	 */
-	espi->max_rate = clk_get_rate(espi->clk) / 2;
-	espi->min_rate = clk_get_rate(espi->clk) / (254 * 256);
-	espi->pdev = pdev;
-
-	espi->irq = platform_get_irq(pdev, 0);
-	if (espi->irq < 0) {
-		error = -EBUSY;
-		dev_err(&pdev->dev, "failed to get irq resources\n");
-		goto fail_put_clock;
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "unable to get iomem resource\n");
-		error = -ENODEV;
-		goto fail_put_clock;
-	}
-
-	res = request_mem_region(res->start, resource_size(res), pdev->name);
-	if (!res) {
-		dev_err(&pdev->dev, "unable to request iomem resources\n");
-		error = -EBUSY;
-		goto fail_put_clock;
-	}
-
-	espi->regs_base = ioremap(res->start, resource_size(res));
-	if (!espi->regs_base) {
-		dev_err(&pdev->dev, "failed to map resources\n");
-		error = -ENODEV;
-		goto fail_free_mem;
-	}
-
-	error = request_irq(espi->irq, ep93xx_spi_interrupt, 0,
-			    "ep93xx-spi", espi);
-	if (error) {
-		dev_err(&pdev->dev, "failed to request irq\n");
-		goto fail_unmap_regs;
-	}
-
-	espi->wq = create_singlethread_workqueue("ep93xx_spid");
-	if (!espi->wq) {
-		dev_err(&pdev->dev, "unable to create workqueue\n");
-		goto fail_free_irq;
-	}
-	INIT_WORK(&espi->msg_work, ep93xx_spi_work);
-	INIT_LIST_HEAD(&espi->msg_queue);
-	espi->running = true;
-
-	/* make sure that the hardware is disabled */
-	ep93xx_spi_write_u8(espi, SSPCR1, 0);
-
-	error = spi_register_master(master);
-	if (error) {
-		dev_err(&pdev->dev, "failed to register SPI master\n");
-		goto fail_free_queue;
-	}
-
-	dev_info(&pdev->dev, "EP93xx SPI Controller at 0x%08lx irq %d\n",
-		 (unsigned long)res->start, espi->irq);
-
-	return 0;
-
-fail_free_queue:
-	destroy_workqueue(espi->wq);
-fail_free_irq:
-	free_irq(espi->irq, espi);
-fail_unmap_regs:
-	iounmap(espi->regs_base);
-fail_free_mem:
-	release_mem_region(res->start, resource_size(res));
-fail_put_clock:
-	clk_put(espi->clk);
-fail_release_master:
-	spi_master_put(master);
-	platform_set_drvdata(pdev, NULL);
-
-	return error;
-}
-
-static int __exit ep93xx_spi_remove(struct platform_device *pdev)
-{
-	struct spi_master *master = platform_get_drvdata(pdev);
-	struct ep93xx_spi *espi = spi_master_get_devdata(master);
-	struct resource *res;
-
-	spin_lock_irq(&espi->lock);
-	espi->running = false;
-	spin_unlock_irq(&espi->lock);
-
-	destroy_workqueue(espi->wq);
-
-	/*
-	 * Complete remaining messages with %-ESHUTDOWN status.
-	 */
-	spin_lock_irq(&espi->lock);
-	while (!list_empty(&espi->msg_queue)) {
-		struct spi_message *msg;
-
-		msg = list_first_entry(&espi->msg_queue,
-				       struct spi_message, queue);
-		list_del_init(&msg->queue);
-		msg->status = -ESHUTDOWN;
-		spin_unlock_irq(&espi->lock);
-		msg->complete(msg->context);
-		spin_lock_irq(&espi->lock);
-	}
-	spin_unlock_irq(&espi->lock);
-
-	free_irq(espi->irq, espi);
-	iounmap(espi->regs_base);
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	release_mem_region(res->start, resource_size(res));
-	clk_put(espi->clk);
-	platform_set_drvdata(pdev, NULL);
-
-	spi_unregister_master(master);
-	return 0;
-}
-
-static struct platform_driver ep93xx_spi_driver = {
-	.driver		= {
-		.name	= "ep93xx-spi",
-		.owner	= THIS_MODULE,
-	},
-	.remove		= __exit_p(ep93xx_spi_remove),
-};
-
-static int __init ep93xx_spi_init(void)
-{
-	return platform_driver_probe(&ep93xx_spi_driver, ep93xx_spi_probe);
-}
-module_init(ep93xx_spi_init);
-
-static void __exit ep93xx_spi_exit(void)
-{
-	platform_driver_unregister(&ep93xx_spi_driver);
-}
-module_exit(ep93xx_spi_exit);
-
-MODULE_DESCRIPTION("EP93xx SPI Controller driver");
-MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS("platform:ep93xx-spi");