1 files changed, 711 insertions, 0 deletions

diff --git a/drivers/spi/spi_mxs.c b/drivers/spi/spi_mxs.c
new file mode 100644
index 000000000000..744be68d9433
--- /dev/null
+++ b/drivers/spi/spi_mxs.c
@@ -0,0 +1,711 @@
+/*
+ * Freescale MXS SPI master driver
+ *
+ * Author: dmitry pervushin <dimka@embeddedalley.com>
+ *
+ * Copyright 2008-2010 Freescale Semiconductor, Inc.
+ * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <asm/dma.h>
+
+#include <mach/regs-ssp.h>
+#include <mach/dmaengine.h>
+#include <mach/device.h>
+#include <mach/system.h>
+#include <mach/hardware.h>
+
+#include "spi_mxs.h"
+
+/* 0 means DMA modei(recommended, default), !0 - PIO mode */
+static int pio /* = 0 */ ;
+static int debug;
+
+/**
+ * mxs_spi_init_hw
+ *
+ * Initialize the SSP port
+ */
+static int mxs_spi_init_hw(struct mxs_spi *ss)
+{
+	int err;
+
+	ss->clk = clk_get(NULL, "ssp.0");
+	if (IS_ERR(ss->clk)) {
+		err = PTR_ERR(ss->clk);
+		goto out;
+	}
+	clk_enable(ss->clk);
+
+	mxs_reset_block((void *)ss->regs, 0);
+	mxs_dma_reset(ss->dma);
+
+	return 0;
+
+out:
+	return err;
+}
+
+static void mxs_spi_release_hw(struct mxs_spi *ss)
+{
+	if (ss->clk && !IS_ERR(ss->clk)) {
+		clk_disable(ss->clk);
+		clk_put(ss->clk);
+	}
+}
+
+static int mxs_spi_setup_transfer(struct spi_device *spi,
+				  struct spi_transfer *t)
+{
+	u8 bits_per_word;
+	u32 hz;
+	struct mxs_spi *ss /* = spi_master_get_devdata(spi->master) */ ;
+	u16 rate;
+
+	ss = spi_master_get_devdata(spi->master);
+
+	bits_per_word = spi->bits_per_word;
+	if (t && t->bits_per_word)
+		bits_per_word = t->bits_per_word;
+
+	/*
+	   Calculate speed:
+	   - by default, use maximum speed from ssp clk
+	   - if device overrides it, use it
+	   - if transfer specifies other speed, use transfer's one
+	 */
+	hz = 1000 * ss->speed_khz / ss->divider;
+	if (spi->max_speed_hz)
+		hz = min(hz, spi->max_speed_hz);
+	if (t && t->speed_hz)
+		hz = min(hz, t->speed_hz);
+
+	if (hz == 0) {
+		dev_err(&spi->dev, "Cannot continue with zero clock\n");
+		return -EINVAL;
+	}
+
+	if (bits_per_word != 8) {
+		dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
+			__func__, bits_per_word);
+		return -EINVAL;
+	}
+
+	dev_dbg(&spi->dev, "Requested clk rate = %uHz, max = %ukHz/%d = %uHz\n",
+		hz, ss->speed_khz, ss->divider,
+		ss->speed_khz * 1000 / ss->divider);
+
+	if (ss->speed_khz * 1000 / ss->divider < hz) {
+		dev_err(&spi->dev, "%s, unsupported clock rate %uHz\n",
+			__func__, hz);
+		return -EINVAL;
+	}
+
+	rate = 1000 * ss->speed_khz / ss->divider / hz;
+
+	__raw_writel(BF_SSP_TIMING_CLOCK_DIVIDE(ss->divider) |
+		     BF_SSP_TIMING_CLOCK_RATE(rate - 1),
+		     ss->regs + HW_SSP_TIMING);
+
+	__raw_writel(BF_SSP_CTRL1_SSP_MODE(BV_SSP_CTRL1_SSP_MODE__SPI) |
+		     BF_SSP_CTRL1_WORD_LENGTH
+		     (BV_SSP_CTRL1_WORD_LENGTH__EIGHT_BITS) |
+		     ((spi->mode & SPI_CPOL) ? BM_SSP_CTRL1_POLARITY : 0) |
+		     ((spi->mode & SPI_CPHA) ? BM_SSP_CTRL1_PHASE : 0) |
+		     (pio ? 0 : BM_SSP_CTRL1_DMA_ENABLE),
+		     ss->regs + HW_SSP_CTRL1);
+
+	__raw_writel(0x00, ss->regs + HW_SSP_CMD0_SET);
+
+	return 0;
+}
+
+static void mxs_spi_cleanup(struct spi_device *spi)
+{
+	struct mxs_spi_platform_data *pdata = spi->dev.platform_data;
+
+	if (pdata && pdata->hw_pin_release)
+		pdata->hw_pin_release();
+}
+
+/* the spi->mode bits understood by this driver: */
+#define MODEBITS (SPI_CPOL | SPI_CPHA)
+static int mxs_spi_setup(struct spi_device *spi)
+{
+	struct mxs_spi_platform_data *pdata;
+	struct mxs_spi *ss;
+	int err = 0;
+
+	ss = spi_master_get_devdata(spi->master);
+
+	if (!spi->bits_per_word)
+		spi->bits_per_word = 8;
+
+	if (spi->mode & ~MODEBITS) {
+		dev_err(&spi->dev, "%s: unsupported mode bits %x\n",
+			__func__, spi->mode & ~MODEBITS);
+		err = -EINVAL;
+		goto out;
+	}
+
+	dev_dbg(&spi->dev, "%s, mode %d, %u bits/w\n",
+		__func__, spi->mode & MODEBITS, spi->bits_per_word);
+
+	pdata = spi->dev.platform_data;
+
+	if (pdata && pdata->hw_pin_init) {
+		err = pdata->hw_pin_init();
+		if (err)
+			goto out;
+	}
+
+	err = mxs_spi_setup_transfer(spi, NULL);
+	if (err)
+		goto out2;
+	return 0;
+
+out2:
+	if (pdata && pdata->hw_pin_release)
+		pdata->hw_pin_release();
+out:
+	dev_err(&spi->dev, "Failed to setup transfer, error = %d\n", err);
+	return err;
+}
+
+static inline u32 mxs_spi_cs(unsigned cs)
+{
+	return ((cs & 1) ? BM_SSP_CTRL0_WAIT_FOR_CMD : 0) |
+	    ((cs & 2) ? BM_SSP_CTRL0_WAIT_FOR_IRQ : 0);
+}
+
+static int mxs_spi_txrx_dma(struct mxs_spi *ss, int cs,
+			    unsigned char *buf, dma_addr_t dma_buf, int len,
+			    int *first, int *last, int write)
+{
+	u32 c0 = 0;
+	dma_addr_t spi_buf_dma = dma_buf;
+	int count, status = 0;
+	enum dma_data_direction dir = write ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
+
+	c0 |= (*first ? BM_SSP_CTRL0_LOCK_CS : 0);
+	c0 |= (*last ? BM_SSP_CTRL0_IGNORE_CRC : 0);
+	c0 |= (write ? 0 : BM_SSP_CTRL0_READ);
+	c0 |= BM_SSP_CTRL0_DATA_XFER;
+
+	c0 |= mxs_spi_cs(cs);
+
+	c0 |= BF_SSP_CTRL0_XFER_COUNT(len);
+
+	if (!dma_buf)
+		spi_buf_dma = dma_map_single(ss->master_dev, buf, len, dir);
+
+	ss->pdesc->cmd.cmd.bits.bytes = len;
+	ss->pdesc->cmd.cmd.bits.pio_words = 1;
+	ss->pdesc->cmd.cmd.bits.wait4end = 1;
+	ss->pdesc->cmd.cmd.bits.dec_sem = 1;
+	ss->pdesc->cmd.cmd.bits.irq = 1;
+	ss->pdesc->cmd.cmd.bits.command = write ? DMA_READ : DMA_WRITE;
+	ss->pdesc->cmd.address = spi_buf_dma;
+	ss->pdesc->cmd.pio_words[0] = c0;
+	mxs_dma_desc_append(ss->dma, ss->pdesc);
+
+	mxs_dma_reset(ss->dma);
+	mxs_dma_ack_irq(ss->dma);
+	mxs_dma_enable_irq(ss->dma, 1);
+	init_completion(&ss->done);
+	mxs_dma_enable(ss->dma);
+	wait_for_completion(&ss->done);
+	count = 10000;
+	while ((__raw_readl(ss->regs + HW_SSP_CTRL0) & BM_SSP_CTRL0_RUN)
+	       && count--)
+		continue;
+	if (count <= 0) {
+		printk(KERN_ERR "%c: timeout on line %s:%d\n",
+		       write ? 'W' : 'C', __func__, __LINE__);
+		status = -ETIMEDOUT;
+	}
+
+	if (!dma_buf)
+		dma_unmap_single(ss->master_dev, spi_buf_dma, len, dir);
+
+	return status;
+}
+
+static inline void mxs_spi_enable(struct mxs_spi *ss)
+{
+	__raw_writel(BM_SSP_CTRL0_LOCK_CS, ss->regs + HW_SSP_CTRL0_SET);
+	__raw_writel(BM_SSP_CTRL0_IGNORE_CRC, ss->regs + HW_SSP_CTRL0_CLR);
+}
+
+static inline void mxs_spi_disable(struct mxs_spi *ss)
+{
+	__raw_writel(BM_SSP_CTRL0_LOCK_CS, ss->regs + HW_SSP_CTRL0_CLR);
+	__raw_writel(BM_SSP_CTRL0_IGNORE_CRC, ss->regs + HW_SSP_CTRL0_SET);
+}
+
+static int mxs_spi_txrx_pio(struct mxs_spi *ss, int cs,
+			    unsigned char *buf, int len,
+			    int *first, int *last, int write)
+{
+	int count;
+
+	if (*first) {
+		mxs_spi_enable(ss);
+		*first = 0;
+	}
+
+	__raw_writel(mxs_spi_cs(cs), ss->regs + HW_SSP_CTRL0_SET);
+
+	while (len--) {
+		if (*last && len == 0) {
+			mxs_spi_disable(ss);
+			*last = 0;
+		}
+		__raw_writel(BM_SSP_CTRL0_XFER_COUNT,
+			     ss->regs + HW_SSP_CTRL0_CLR);
+		__raw_writel(1, ss->regs + HW_SSP_CTRL0_SET);	/* byte-by-byte */
+
+		if (write)
+			__raw_writel(BM_SSP_CTRL0_READ,
+				     ss->regs + HW_SSP_CTRL0_CLR);
+		else
+			__raw_writel(BM_SSP_CTRL0_READ,
+				     ss->regs + HW_SSP_CTRL0_SET);
+
+		/* Run! */
+		__raw_writel(BM_SSP_CTRL0_RUN, ss->regs + HW_SSP_CTRL0_SET);
+		count = 10000;
+		while (((__raw_readl(ss->regs + HW_SSP_CTRL0) &
+			 BM_SSP_CTRL0_RUN) == 0) && count--)
+			continue;
+		if (count <= 0) {
+			printk(KERN_ERR "%c: timeout on line %s:%d\n",
+			       write ? 'W' : 'C', __func__, __LINE__);
+			break;
+		}
+
+		if (write)
+			__raw_writel(*buf, ss->regs + HW_SSP_DATA);
+
+		/* Set TRANSFER */
+		__raw_writel(BM_SSP_CTRL0_DATA_XFER,
+			     ss->regs + HW_SSP_CTRL0_SET);
+
+		if (!write) {
+			count = 10000;
+			while (count-- &&
+			       (__raw_readl(ss->regs + HW_SSP_STATUS) &
+				BM_SSP_STATUS_FIFO_EMPTY))
+				continue;
+			if (count <= 0) {
+				printk(KERN_ERR "%c: timeout on line %s:%d\n",
+				       write ? 'W' : 'C', __func__, __LINE__);
+				break;
+			}
+			*buf = (__raw_readl(ss->regs + HW_SSP_DATA) & 0xFF);
+		}
+
+		count = 10000;
+		while ((__raw_readl(ss->regs + HW_SSP_CTRL0) & BM_SSP_CTRL0_RUN)
+		       && count--)
+			continue;
+		if (count <= 0) {
+			printk(KERN_ERR "%c: timeout on line %s:%d\n",
+			       write ? 'W' : 'C', __func__, __LINE__);
+			break;
+		}
+
+		/* advance to the next byte */
+		buf++;
+	}
+	return len < 0 ? 0 : -ETIMEDOUT;
+}
+
+static int mxs_spi_handle_message(struct mxs_spi *ss, struct spi_message *m)
+{
+	int first, last;
+	struct spi_transfer *t, *tmp_t;
+	int status = 0;
+	int cs;
+
+	first = last = 0;
+
+	cs = m->spi->chip_select;
+
+	list_for_each_entry_safe(t, tmp_t, &m->transfers, transfer_list) {
+
+		mxs_spi_setup_transfer(m->spi, t);
+
+		if (&t->transfer_list == m->transfers.next)
+			first = !0;
+		if (&t->transfer_list == m->transfers.prev)
+			last = !0;
+		if (t->rx_buf && t->tx_buf) {
+			pr_debug("%s: cannot send and receive simultaneously\n",
+				 __func__);
+			return -EINVAL;
+		}
+
+		/*
+		   REVISIT:
+		   here driver completely ignores setting of t->cs_change
+		 */
+		if (t->tx_buf) {
+			status = pio ?
+			    mxs_spi_txrx_pio(ss, cs, (void *)t->tx_buf,
+					     t->len, &first, &last, 1) :
+			    mxs_spi_txrx_dma(ss, cs, (void *)t->tx_buf,
+					     t->tx_dma, t->len, &first, &last,
+					     1);
+			if (debug) {
+				if (t->len < 0x10)
+					print_hex_dump_bytes("Tx ",
+							     DUMP_PREFIX_OFFSET,
+							     t->tx_buf, t->len);
+				else
+					pr_debug("Tx: %d bytes\n", t->len);
+			}
+		}
+		if (t->rx_buf) {
+			status = pio ?
+			    mxs_spi_txrx_pio(ss, cs, t->rx_buf,
+					     t->len, &first, &last, 0) :
+			    mxs_spi_txrx_dma(ss, cs, t->rx_buf,
+					     t->rx_dma, t->len, &first, &last,
+					     0);
+			if (debug) {
+				if (t->len < 0x10)
+					print_hex_dump_bytes("Rx ",
+							     DUMP_PREFIX_OFFSET,
+							     t->rx_buf, t->len);
+				else
+					pr_debug("Rx: %d bytes\n", t->len);
+			}
+		}
+
+		if (status)
+			break;
+
+		first = last = 0;
+
+	}
+	return status;
+}
+
+/**
+ * mxs_spi_handle
+ *
+ * The workhorse of the driver - it handles messages from the list
+ *
+ **/
+static void mxs_spi_handle(struct work_struct *w)
+{
+	struct mxs_spi *ss = container_of(w, struct mxs_spi, work);
+	unsigned long flags;
+	struct spi_message *m;
+
+	BUG_ON(w == NULL);
+
+	spin_lock_irqsave(&ss->lock, flags);
+	while (!list_empty(&ss->queue)) {
+		m = list_entry(ss->queue.next, struct spi_message, queue);
+		list_del_init(&m->queue);
+		spin_unlock_irqrestore(&ss->lock, flags);
+
+		m->status = mxs_spi_handle_message(ss, m);
+		if (m->complete)
+			m->complete(m->context);
+
+		spin_lock_irqsave(&ss->lock, flags);
+	}
+	spin_unlock_irqrestore(&ss->lock, flags);
+
+	return;
+}
+
+/**
+ * mxs_spi_transfer
+ *
+ * Called indirectly from spi_async, queues all the messages to
+ * spi_handle_message
+ *
+ * @spi: spi device
+ * @m: message to be queued
+**/
+static int mxs_spi_transfer(struct spi_device *spi, struct spi_message *m)
+{
+	struct mxs_spi *ss = spi_master_get_devdata(spi->master);
+	unsigned long flags;
+
+	m->status = -EINPROGRESS;
+	spin_lock_irqsave(&ss->lock, flags);
+	list_add_tail(&m->queue, &ss->queue);
+	queue_work(ss->workqueue, &ss->work);
+	spin_unlock_irqrestore(&ss->lock, flags);
+	return 0;
+}
+
+static irqreturn_t mxs_spi_irq_dma(int irq, void *dev_id)
+{
+	struct mxs_spi *ss = dev_id;
+
+	mxs_dma_ack_irq(ss->dma);
+	mxs_dma_cooked(ss->dma, NULL);
+	complete(&ss->done);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mxs_spi_irq_err(int irq, void *dev_id)
+{
+	struct mxs_spi *ss = dev_id;
+	u32 c1, st;
+
+	c1 = __raw_readl(ss->regs + HW_SSP_CTRL1);
+	st = __raw_readl(ss->regs + HW_SSP_STATUS);
+	printk(KERN_ERR "IRQ - ERROR!, status = 0x%08X, c1 = 0x%08X\n", st, c1);
+	__raw_writel(c1 & 0xCCCC0000, ss->regs + HW_SSP_CTRL1_CLR);
+
+	return IRQ_HANDLED;
+}
+
+static int __init mxs_spi_probe(struct platform_device *dev)
+{
+	int err = 0;
+	struct spi_master *master;
+	struct mxs_spi *ss;
+	struct resource *r;
+	u32 mem;
+
+	/* Get resources(memory, IRQ) associated with the device */
+	master = spi_alloc_master(&dev->dev, sizeof(struct mxs_spi));
+
+	if (master == NULL) {
+		err = -ENOMEM;
+		goto out0;
+	}
+
+	platform_set_drvdata(dev, master);
+
+	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (r == NULL) {
+		err = -ENODEV;
+		goto out_put_master;
+	}
+
+	ss = spi_master_get_devdata(master);
+	ss->master_dev = &dev->dev;
+
+	INIT_WORK(&ss->work, mxs_spi_handle);
+	INIT_LIST_HEAD(&ss->queue);
+	spin_lock_init(&ss->lock);
+	ss->workqueue = create_singlethread_workqueue(dev_name(&dev->dev));
+	master->transfer = mxs_spi_transfer;
+	master->setup = mxs_spi_setup;
+	master->cleanup = mxs_spi_cleanup;
+
+	if (!request_mem_region(r->start,
+				resource_size(r), dev_name(&dev->dev))) {
+		err = -ENXIO;
+		goto out_put_master;
+	}
+	mem = r->start;
+
+	ss->regs = IO_ADDRESS(r->start);
+
+	ss->irq_dma = platform_get_irq(dev, 0);
+	if (ss->irq_dma < 0) {
+		err = -ENXIO;
+		goto out_put_master;
+	}
+	ss->irq_err = platform_get_irq(dev, 1);
+	if (ss->irq_err < 0) {
+		err = -ENXIO;
+		goto out_put_master;
+	}
+
+	r = platform_get_resource(dev, IORESOURCE_DMA, 0);
+	if (r == NULL) {
+		err = -ENODEV;
+		goto out_put_master;
+	}
+
+	ss->dma = r->start;
+	err = mxs_dma_request(ss->dma, &dev->dev, (char *)dev_name(&dev->dev));
+	if (err)
+		goto out_put_master;
+
+	ss->pdesc = mxs_dma_alloc_desc();
+	if (ss->pdesc == NULL || IS_ERR(ss->pdesc)) {
+		err = -ENOMEM;
+		goto out_free_dma;
+	}
+
+	master->bus_num = dev->id + 1;
+	master->num_chipselect = 1;
+
+	/* SPI controller initializations */
+	err = mxs_spi_init_hw(ss);
+	if (err) {
+		dev_dbg(&dev->dev, "cannot initialize hardware\n");
+		goto out_free_dma_desc;
+	}
+
+	clk_set_rate(ss->clk, 120 * 1000 * 1000);
+	ss->speed_khz = clk_get_rate(ss->clk) / 1000;
+	ss->divider = 2;
+	dev_info(&dev->dev, "Max possible speed %d = %ld/%d kHz\n",
+		 ss->speed_khz, clk_get_rate(ss->clk), ss->divider);
+
+	/* Register for SPI Interrupt */
+	err = request_irq(ss->irq_dma, mxs_spi_irq_dma, 0,
+			  dev_name(&dev->dev), ss);
+	if (err) {
+		dev_dbg(&dev->dev, "request_irq failed, %d\n", err);
+		goto out_release_hw;
+	}
+	err = request_irq(ss->irq_err, mxs_spi_irq_err, IRQF_SHARED,
+			  dev_name(&dev->dev), ss);
+	if (err) {
+		dev_dbg(&dev->dev, "request_irq(error) failed, %d\n", err);
+		goto out_free_irq;
+	}
+
+	err = spi_register_master(master);
+	if (err) {
+		dev_dbg(&dev->dev, "cannot register spi master, %d\n", err);
+		goto out_free_irq_2;
+	}
+	dev_info(&dev->dev, "at 0x%08X mapped to 0x%08X, irq=%d, bus %d, %s\n",
+		 mem, (u32) ss->regs, ss->irq_dma,
+		 master->bus_num, pio ? "PIO" : "DMA");
+	return 0;
+
+out_free_irq_2:
+	free_irq(ss->irq_err, ss);
+out_free_irq:
+	free_irq(ss->irq_dma, ss);
+out_free_dma_desc:
+	mxs_dma_free_desc(ss->pdesc);
+out_free_dma:
+	mxs_dma_release(ss->dma, &dev->dev);
+out_release_hw:
+	mxs_spi_release_hw(ss);
+out_put_master:
+	spi_master_put(master);
+out0:
+	return err;
+}
+
+static int __devexit mxs_spi_remove(struct platform_device *dev)
+{
+	struct mxs_spi *ss;
+	struct spi_master *master;
+
+	master = platform_get_drvdata(dev);
+	if (master == NULL)
+		goto out0;
+	ss = spi_master_get_devdata(master);
+	if (ss == NULL)
+		goto out1;
+	free_irq(ss->irq_err, ss);
+	free_irq(ss->irq_dma, ss);
+	if (ss->workqueue)
+		destroy_workqueue(ss->workqueue);
+	mxs_dma_free_desc(ss->pdesc);
+	mxs_dma_release(ss->dma, &dev->dev);
+	mxs_spi_release_hw(ss);
+	platform_set_drvdata(dev, 0);
+out1:
+	spi_master_put(master);
+out0:
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int mxs_spi_suspend(struct platform_device *pdev, pm_message_t pmsg)
+{
+	struct mxs_spi *ss;
+	struct spi_master *master;
+
+	master = platform_get_drvdata(pdev);
+	ss = spi_master_get_devdata(master);
+
+	ss->saved_timings = __raw_readl(ss->regs + HW_SSP_TIMING);
+	clk_disable(ss->clk);
+
+	return 0;
+}
+
+static int mxs_spi_resume(struct platform_device *pdev)
+{
+	struct mxs_spi *ss;
+	struct spi_master *master;
+
+	master = platform_get_drvdata(pdev);
+	ss = spi_master_get_devdata(master);
+
+	clk_enable(ss->clk);
+	__raw_writel(BM_SSP_CTRL0_SFTRST | BM_SSP_CTRL0_CLKGATE,
+		     ss->regs + HW_SSP_CTRL0_CLR);
+	__raw_writel(ss->saved_timings, ss->regs + HW_SSP_TIMING);
+
+	return 0;
+}
+
+#else
+#define mxs_spi_suspend NULL
+#define mxs_spi_resume  NULL
+#endif
+
+static struct platform_driver mxs_spi_driver = {
+	.probe = mxs_spi_probe,
+	.remove = __devexit_p(mxs_spi_remove),
+	.driver = {
+		   .name = "mxs-spi",
+		   .owner = THIS_MODULE,
+		   },
+	.suspend = mxs_spi_suspend,
+	.resume = mxs_spi_resume,
+};
+
+static int __init mxs_spi_init(void)
+{
+	return platform_driver_register(&mxs_spi_driver);
+}
+
+static void __exit mxs_spi_exit(void)
+{
+	platform_driver_unregister(&mxs_spi_driver);
+}
+
+module_init(mxs_spi_init);
+module_exit(mxs_spi_exit);
+module_param(pio, int, S_IRUGO);
+module_param(debug, int, S_IRUGO);
+MODULE_AUTHOR("dmitry pervushin <dimka@embeddedalley.com>");
+MODULE_DESCRIPTION("MXS SPI/SSP");
+MODULE_LICENSE("GPL");