[PATCH] SPI: add PXA2xx SSP SPI Driver

This driver turns a PXA2xx synchronous serial port (SSP) into a SPI master
controller (see Documentation/spi/spi_summary).  The driver has the following
features:

- Support for any PXA2xx SSP
- SSP PIO and SSP DMA data transfers.
- External and Internal (SSPFRM) chip selects.
- Per slave device (chip) configuration.
- Full suspend, freeze, resume support.

Signed-off-by: Stephen Street <stephen@streetfiresound.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1399 insertions, 0 deletions

diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
new file mode 100644
index 000000000000..913e1aff0235
--- /dev/null
+++ b/drivers/spi/pxa2xx_spi.c
@@ -0,0 +1,1399 @@
+/*
+ * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/ioport.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 <linux/errno.h>
+#include <linux/delay.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/hardware.h>
+#include <asm/delay.h>
+#include <asm/dma.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/pxa-regs.h>
+#include <asm/arch/pxa2xx_spi.h>
+
+MODULE_AUTHOR("Stephen Street");
+MODULE_DESCRIPTION("PXA2xx SSP SPI Contoller");
+MODULE_LICENSE("GPL");
+
+#define MAX_BUSES 3
+
+#define DMA_INT_MASK (DCSR_ENDINTR | DCSR_STARTINTR | DCSR_BUSERR)
+#define RESET_DMA_CHANNEL (DCSR_NODESC | DMA_INT_MASK)
+#define IS_DMA_ALIGNED(x) (((u32)(x)&0x07)==0)
+
+#define DEFINE_SSP_REG(reg, off) \
+static inline u32 read_##reg(void *p) { return __raw_readl(p + (off)); } \
+static inline void write_##reg(u32 v, void *p) { __raw_writel(v, p + (off)); }
+
+DEFINE_SSP_REG(SSCR0, 0x00)
+DEFINE_SSP_REG(SSCR1, 0x04)
+DEFINE_SSP_REG(SSSR, 0x08)
+DEFINE_SSP_REG(SSITR, 0x0c)
+DEFINE_SSP_REG(SSDR, 0x10)
+DEFINE_SSP_REG(SSTO, 0x28)
+DEFINE_SSP_REG(SSPSP, 0x2c)
+
+#define START_STATE ((void*)0)
+#define RUNNING_STATE ((void*)1)
+#define DONE_STATE ((void*)2)
+#define ERROR_STATE ((void*)-1)
+
+#define QUEUE_RUNNING 0
+#define QUEUE_STOPPED 1
+
+struct driver_data {
+        /* Driver model hookup */
+        struct platform_device *pdev;
+
+        /* SPI framework hookup */
+        enum pxa_ssp_type ssp_type;
+        struct spi_master *master;
+
+        /* PXA hookup */
+        struct pxa2xx_spi_master *master_info;
+
+        /* DMA setup stuff */
+        int rx_channel;
+        int tx_channel;
+        u32 *null_dma_buf;
+
+        /* SSP register addresses */
+        void *ioaddr;
+        u32 ssdr_physical;
+
+        /* SSP masks*/
+        u32 dma_cr1;
+        u32 int_cr1;
+        u32 clear_sr;
+        u32 mask_sr;
+
+        /* Driver message queue */
+        struct workqueue_struct *workqueue;
+        struct work_struct pump_messages;
+        spinlock_t lock;
+        struct list_head queue;
+        int busy;
+        int run;
+
+        /* Message Transfer pump */
+        struct tasklet_struct pump_transfers;
+
+        /* Current message transfer state info */
+        struct spi_message* cur_msg;
+        struct spi_transfer* cur_transfer;
+        struct chip_data *cur_chip;
+        size_t len;
+        void *tx;
+        void *tx_end;
+        void *rx;
+        void *rx_end;
+        int dma_mapped;
+        dma_addr_t rx_dma;
+        dma_addr_t tx_dma;
+        size_t rx_map_len;
+        size_t tx_map_len;
+        int cs_change;
+        void (*write)(struct driver_data *drv_data);
+        void (*read)(struct driver_data *drv_data);
+        irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
+        void (*cs_control)(u32 command);
+};
+
+struct chip_data {
+        u32 cr0;
+        u32 cr1;
+        u32 to;
+        u32 psp;
+        u32 timeout;
+        u8 n_bytes;
+        u32 dma_width;
+        u32 dma_burst_size;
+        u32 threshold;
+        u32 dma_threshold;
+        u8 enable_dma;
+        void (*write)(struct driver_data *drv_data);
+        void (*read)(struct driver_data *drv_data);
+        void (*cs_control)(u32 command);
+};
+
+static void pump_messages(void *data);
+
+static int flush(struct driver_data *drv_data)
+{
+        unsigned long limit = loops_per_jiffy << 1;
+
+        void *reg = drv_data->ioaddr;
+
+        do {
+                while (read_SSSR(reg) & SSSR_RNE) {
+                        read_SSDR(reg);
+                }
+        } while ((read_SSSR(reg) & SSSR_BSY) && limit--);
+        write_SSSR(SSSR_ROR, reg);
+
+        return limit;
+}
+
+static void restore_state(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        /* Clear status and disable clock */
+        write_SSSR(drv_data->clear_sr, reg);
+        write_SSCR0(drv_data->cur_chip->cr0 & ~SSCR0_SSE, reg);
+
+        /* Load the registers */
+        write_SSCR1(drv_data->cur_chip->cr1, reg);
+        write_SSCR0(drv_data->cur_chip->cr0, reg);
+        if (drv_data->ssp_type != PXA25x_SSP) {
+                write_SSTO(0, reg);
+                write_SSPSP(drv_data->cur_chip->psp, reg);
+        }
+}
+
+static void null_cs_control(u32 command)
+{
+}
+
+static void null_writer(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+        u8 n_bytes = drv_data->cur_chip->n_bytes;
+
+        while ((read_SSSR(reg) & SSSR_TNF)
+                        && (drv_data->tx < drv_data->tx_end)) {
+                write_SSDR(0, reg);
+                drv_data->tx += n_bytes;
+        }
+}
+
+static void null_reader(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+        u8 n_bytes = drv_data->cur_chip->n_bytes;
+
+        while ((read_SSSR(reg) & SSSR_RNE)
+                        && (drv_data->rx < drv_data->rx_end)) {
+                read_SSDR(reg);
+                drv_data->rx += n_bytes;
+        }
+}
+
+static void u8_writer(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        while ((read_SSSR(reg) & SSSR_TNF)
+                        && (drv_data->tx < drv_data->tx_end)) {
+                write_SSDR(*(u8 *)(drv_data->tx), reg);
+                ++drv_data->tx;
+        }
+}
+
+static void u8_reader(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        while ((read_SSSR(reg) & SSSR_RNE)
+                        && (drv_data->rx < drv_data->rx_end)) {
+                *(u8 *)(drv_data->rx) = read_SSDR(reg);
+                ++drv_data->rx;
+        }
+}
+
+static void u16_writer(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        while ((read_SSSR(reg) & SSSR_TNF)
+                        && (drv_data->tx < drv_data->tx_end)) {
+                write_SSDR(*(u16 *)(drv_data->tx), reg);
+                drv_data->tx += 2;
+        }
+}
+
+static void u16_reader(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        while ((read_SSSR(reg) & SSSR_RNE)
+                        && (drv_data->rx < drv_data->rx_end)) {
+                *(u16 *)(drv_data->rx) = read_SSDR(reg);
+                drv_data->rx += 2;
+        }
+}
+static void u32_writer(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        while ((read_SSSR(reg) & SSSR_TNF)
+                        && (drv_data->tx < drv_data->tx_end)) {
+                write_SSDR(*(u16 *)(drv_data->tx), reg);
+                drv_data->tx += 4;
+        }
+}
+
+static void u32_reader(struct driver_data *drv_data)
+{
+        void *reg = drv_data->ioaddr;
+
+        while ((read_SSSR(reg) & SSSR_RNE)
+                        && (drv_data->rx < drv_data->rx_end)) {
+                *(u32 *)(drv_data->rx) = read_SSDR(reg);
+                drv_data->rx += 4;
+        }
+}
+
+static void *next_transfer(struct driver_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;
+}
+
+static int map_dma_buffers(struct driver_data *drv_data)
+{
+        struct spi_message *msg = drv_data->cur_msg;
+        struct device *dev = &msg->spi->dev;
+
+        if (!drv_data->cur_chip->enable_dma)
+                return 0;
+
+        if (msg->is_dma_mapped)
+                return  drv_data->rx_dma && drv_data->tx_dma;
+
+        if (!IS_DMA_ALIGNED(drv_data->rx) || !IS_DMA_ALIGNED(drv_data->tx))
+                return 0;
+
+        /* Modify setup if rx buffer is null */
+        if (drv_data->rx == NULL) {
+                *drv_data->null_dma_buf = 0;
+                drv_data->rx = drv_data->null_dma_buf;
+                drv_data->rx_map_len = 4;
+        } else
+                drv_data->rx_map_len = drv_data->len;
+
+
+        /* Modify setup if tx buffer is null */
+        if (drv_data->tx == NULL) {
+                *drv_data->null_dma_buf = 0;
+                drv_data->tx = drv_data->null_dma_buf;
+                drv_data->tx_map_len = 4;
+        } else
+                drv_data->tx_map_len = drv_data->len;
+
+        /* Stream map the rx buffer */
+        drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
+                                                drv_data->rx_map_len,
+                                                DMA_FROM_DEVICE);
+        if (dma_mapping_error(drv_data->rx_dma))
+                return 0;
+
+        /* Stream map the tx buffer */
+        drv_data->tx_dma = dma_map_single(dev, drv_data->tx,
+                                                drv_data->tx_map_len,
+                                                DMA_TO_DEVICE);
+
+        if (dma_mapping_error(drv_data->tx_dma)) {
+                dma_unmap_single(dev, drv_data->rx_dma,
+                                        drv_data->rx_map_len, DMA_FROM_DEVICE);
+                return 0;
+        }
+
+        return 1;
+}
+
+static void unmap_dma_buffers(struct driver_data *drv_data)
+{
+        struct device *dev;
+
+        if (!drv_data->dma_mapped)
+                return;
+
+        if (!drv_data->cur_msg->is_dma_mapped) {
+                dev = &drv_data->cur_msg->spi->dev;
+                dma_unmap_single(dev, drv_data->rx_dma,
+                                        drv_data->rx_map_len, DMA_FROM_DEVICE);
+                dma_unmap_single(dev, drv_data->tx_dma,
+                                        drv_data->tx_map_len, DMA_TO_DEVICE);
+        }
+
+        drv_data->dma_mapped = 0;
+}
+
+/* caller already set message->status; dma and pio irqs are blocked */
+static void giveback(struct spi_message *message, struct driver_data *drv_data)
+{
+        struct spi_transfer* last_transfer;
+
+        last_transfer = list_entry(message->transfers.prev,
+                                        struct spi_transfer,
+                                        transfer_list);
+
+        if (!last_transfer->cs_change)
+                drv_data->cs_control(PXA2XX_CS_DEASSERT);
+
+        message->state = NULL;
+        if (message->complete)
+                message->complete(message->context);
+
+        drv_data->cur_msg = NULL;
+        drv_data->cur_transfer = NULL;
+        drv_data->cur_chip = NULL;
+        queue_work(drv_data->workqueue, &drv_data->pump_messages);
+}
+
+static int wait_ssp_rx_stall(void *ioaddr)
+{
+        unsigned long limit = loops_per_jiffy << 1;
+
+        while ((read_SSSR(ioaddr) & SSSR_BSY) && limit--)
+                cpu_relax();
+
+        return limit;
+}
+
+static int wait_dma_channel_stop(int channel)
+{
+        unsigned long limit = loops_per_jiffy << 1;
+
+        while (!(DCSR(channel) & DCSR_STOPSTATE) && limit--)
+                cpu_relax();
+
+        return limit;
+}
+
+static void dma_handler(int channel, void *data, struct pt_regs *regs)
+{
+        struct driver_data *drv_data = data;
+        struct spi_message *msg = drv_data->cur_msg;
+        void *reg = drv_data->ioaddr;
+        u32 irq_status = DCSR(channel) & DMA_INT_MASK;
+        u32 trailing_sssr = 0;
+
+        if (irq_status & DCSR_BUSERR) {
+
+                /* Disable interrupts, clear status and reset DMA */
+                if (drv_data->ssp_type != PXA25x_SSP)
+                        write_SSTO(0, reg);
+                write_SSSR(drv_data->clear_sr, reg);
+                write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+                DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
+                DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
+
+                if (flush(drv_data) == 0)
+                        dev_err(&drv_data->pdev->dev,
+                                        "dma_handler: flush fail\n");
+
+                unmap_dma_buffers(drv_data);
+
+                if (channel == drv_data->tx_channel)
+                        dev_err(&drv_data->pdev->dev,
+                                "dma_handler: bad bus address on "
+                                "tx channel %d, source %x target = %x\n",
+                                channel, DSADR(channel), DTADR(channel));
+                else
+                        dev_err(&drv_data->pdev->dev,
+                                "dma_handler: bad bus address on "
+                                "rx channel %d, source %x target = %x\n",
+                                channel, DSADR(channel), DTADR(channel));
+
+                msg->state = ERROR_STATE;
+                tasklet_schedule(&drv_data->pump_transfers);
+        }
+
+        /* PXA255x_SSP has no timeout interrupt, wait for tailing bytes */
+        if ((drv_data->ssp_type == PXA25x_SSP)
+                && (channel == drv_data->tx_channel)
+                && (irq_status & DCSR_ENDINTR)) {
+
+                /* Wait for rx to stall */
+                if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
+                        dev_err(&drv_data->pdev->dev,
+                                "dma_handler: ssp rx stall failed\n");
+
+                /* Clear and disable interrupts on SSP and DMA channels*/
+                write_SSSR(drv_data->clear_sr, reg);
+                write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+                DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
+                DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
+                if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
+                        dev_err(&drv_data->pdev->dev,
+                                "dma_handler: dma rx channel stop failed\n");
+
+                unmap_dma_buffers(drv_data);
+
+                /* Read trailing bytes */
+                /* Calculate number of trailing bytes, read them */
+                trailing_sssr = read_SSSR(reg);
+                if ((trailing_sssr & 0xf008) != 0xf000) {
+                        drv_data->rx = drv_data->rx_end -
+                                        (((trailing_sssr >> 12) & 0x0f) + 1);
+                        drv_data->read(drv_data);
+                }
+                msg->actual_length += drv_data->len;
+
+                /* Release chip select if requested, transfer delays are
+                 * handled in pump_transfers */
+                if (drv_data->cs_change)
+                        drv_data->cs_control(PXA2XX_CS_DEASSERT);
+
+                /* Move to next transfer */
+                msg->state = next_transfer(drv_data);
+
+                /* Schedule transfer tasklet */
+                tasklet_schedule(&drv_data->pump_transfers);
+        }
+}
+
+static irqreturn_t dma_transfer(struct driver_data *drv_data)
+{
+        u32 irq_status;
+        u32 trailing_sssr = 0;
+        struct spi_message *msg = drv_data->cur_msg;
+        void *reg = drv_data->ioaddr;
+
+        irq_status = read_SSSR(reg) & drv_data->mask_sr;
+        if (irq_status & SSSR_ROR) {
+                /* Clear and disable interrupts on SSP and DMA channels*/
+                if (drv_data->ssp_type != PXA25x_SSP)
+                        write_SSTO(0, reg);
+                write_SSSR(drv_data->clear_sr, reg);
+                write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+                DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
+                DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
+                unmap_dma_buffers(drv_data);
+
+                if (flush(drv_data) == 0)
+                        dev_err(&drv_data->pdev->dev,
+                                        "dma_transfer: flush fail\n");
+
+                dev_warn(&drv_data->pdev->dev, "dma_transfer: fifo overun\n");
+
+                drv_data->cur_msg->state = ERROR_STATE;
+                tasklet_schedule(&drv_data->pump_transfers);
+
+                return IRQ_HANDLED;
+        }
+
+        /* Check for false positive timeout */
+        if ((irq_status & SSSR_TINT) && DCSR(drv_data->tx_channel) & DCSR_RUN) {
+                write_SSSR(SSSR_TINT, reg);
+                return IRQ_HANDLED;
+        }
+
+        if (irq_status & SSSR_TINT || drv_data->rx == drv_data->rx_end) {
+
+                /* Clear and disable interrupts on SSP and DMA channels*/
+                if (drv_data->ssp_type != PXA25x_SSP)
+                        write_SSTO(0, reg);
+                write_SSSR(drv_data->clear_sr, reg);
+                write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+                DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
+                DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
+
+                if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
+                        dev_err(&drv_data->pdev->dev,
+                                "dma_transfer: dma rx channel stop failed\n");
+
+                if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
+                        dev_err(&drv_data->pdev->dev,
+                                "dma_transfer: ssp rx stall failed\n");
+
+                unmap_dma_buffers(drv_data);
+
+                /* Calculate number of trailing bytes, read them */
+                trailing_sssr = read_SSSR(reg);
+                if ((trailing_sssr & 0xf008) != 0xf000) {
+                        drv_data->rx = drv_data->rx_end -
+                                        (((trailing_sssr >> 12) & 0x0f) + 1);
+                        drv_data->read(drv_data);
+                }
+                msg->actual_length += drv_data->len;
+
+                /* Release chip select if requested, transfer delays are
+                 * handled in pump_transfers */
+                if (drv_data->cs_change)
+                        drv_data->cs_control(PXA2XX_CS_DEASSERT);
+
+                /* Move to next transfer */
+                msg->state = next_transfer(drv_data);
+
+                /* Schedule transfer tasklet */
+                tasklet_schedule(&drv_data->pump_transfers);
+
+                return IRQ_HANDLED;
+        }
+
+        /* Opps problem detected */
+        return IRQ_NONE;
+}
+
+static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
+{
+        u32 irq_status;
+        struct spi_message *msg = drv_data->cur_msg;
+        void *reg = drv_data->ioaddr;
+        irqreturn_t handled = IRQ_NONE;
+        unsigned long limit = loops_per_jiffy << 1;
+
+        while ((irq_status = (read_SSSR(reg) & drv_data->mask_sr))) {
+
+                if (irq_status & SSSR_ROR) {
+
+                        /* Clear and disable interrupts */
+                        if (drv_data->ssp_type != PXA25x_SSP)
+                                write_SSTO(0, reg);
+                        write_SSSR(drv_data->clear_sr, reg);
+                        write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
+
+                        if (flush(drv_data) == 0)
+                                dev_err(&drv_data->pdev->dev,
+                                        "interrupt_transfer: flush fail\n");
+
+                        dev_warn(&drv_data->pdev->dev,
+                                        "interrupt_transfer: fifo overun\n");
+
+                        msg->state = ERROR_STATE;
+                        tasklet_schedule(&drv_data->pump_transfers);
+
+                        return IRQ_HANDLED;
+                }
+
+                /* Look for false positive timeout */
+                if ((irq_status & SSSR_TINT)
+                                && (drv_data->rx < drv_data->rx_end))
+                        write_SSSR(SSSR_TINT, reg);
+
+                /* Pump data */
+                drv_data->read(drv_data);
+                drv_data->write(drv_data);
+
+                if (drv_data->tx == drv_data->tx_end) {
+                        /* Disable tx interrupt */
+                        write_SSCR1(read_SSCR1(reg) & ~SSCR1_TIE, reg);
+
+                        /* PXA25x_SSP has no timeout, read trailing bytes */
+                        if (drv_data->ssp_type == PXA25x_SSP) {
+                                while ((read_SSSR(reg) & SSSR_BSY) && limit--)
+                                        drv_data->read(drv_data);
+
+                                if (limit == 0)
+                                        dev_err(&drv_data->pdev->dev,
+                                                "interrupt_transfer: "
+                                                "trailing byte read failed\n");
+                        }
+                }
+
+                if ((irq_status & SSSR_TINT)
+                                || (drv_data->rx == drv_data->rx_end)) {
+
+                        /* Clear timeout */
+                        if (drv_data->ssp_type != PXA25x_SSP)
+                                write_SSTO(0, reg);
+                        write_SSSR(drv_data->clear_sr, reg);
+                        write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
+
+                        /* Update total byte transfered */
+                        msg->actual_length += drv_data->len;
+
+                        /* Release chip select if requested, transfer delays are
+                         * handled in pump_transfers */
+                        if (drv_data->cs_change)
+                                drv_data->cs_control(PXA2XX_CS_DEASSERT);
+
+                        /* Move to next transfer */
+                        msg->state = next_transfer(drv_data);
+
+                        /* Schedule transfer tasklet */
+                        tasklet_schedule(&drv_data->pump_transfers);
+
+                        return IRQ_HANDLED;
+                }
+
+                /* We did something */
+                handled = IRQ_HANDLED;
+        }
+
+        return handled;
+}
+
+static irqreturn_t ssp_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+        struct driver_data *drv_data = (struct driver_data *)dev_id;
+
+        if (!drv_data->cur_msg) {
+                dev_err(&drv_data->pdev->dev, "bad message state "
+                                "in interrupt handler\n");
+                /* Never fail */
+                return IRQ_HANDLED;
+        }
+
+        return drv_data->transfer_handler(drv_data);
+}
+
+static void pump_transfers(unsigned long data)
+{
+        struct driver_data *drv_data = (struct driver_data *)data;
+        struct spi_message *message = NULL;
+        struct spi_transfer *transfer = NULL;
+        struct spi_transfer *previous = NULL;
+        struct chip_data *chip = NULL;
+        void *reg = drv_data->ioaddr;
+
+        /* Get current state information */
+        message = drv_data->cur_msg;
+        transfer = drv_data->cur_transfer;
+        chip = drv_data->cur_chip;
+
+        /* Handle for abort */
+        if (message->state == ERROR_STATE) {
+                message->status = -EIO;
+                giveback(message, drv_data);
+                return;
+        }
+
+        /* Handle end of message */
+        if (message->state == DONE_STATE) {
+                message->status = 0;
+                giveback(message, drv_data);
+                return;
+        }
+
+        /* Delay if requested at end of transfer*/
+        if (message->state == RUNNING_STATE) {
+                previous = list_entry(transfer->transfer_list.prev,
+                                        struct spi_transfer,
+                                        transfer_list);
+                if (previous->delay_usecs)
+                        udelay(previous->delay_usecs);
+        }
+
+        /* Setup the transfer state based on the type of transfer */
+        if (flush(drv_data) == 0) {
+                dev_err(&drv_data->pdev->dev, "pump_transfers: flush failed\n");
+                message->status = -EIO;
+                giveback(message, drv_data);
+                return;
+        }
+        drv_data->cs_control = chip->cs_control;
+        drv_data->tx = (void *)transfer->tx_buf;
+        drv_data->tx_end = drv_data->tx + transfer->len;
+        drv_data->rx = transfer->rx_buf;
+        drv_data->rx_end = drv_data->rx + transfer->len;
+        drv_data->rx_dma = transfer->rx_dma;
+        drv_data->tx_dma = transfer->tx_dma;
+        drv_data->len = transfer->len;
+        drv_data->write = drv_data->tx ? chip->write : null_writer;
+        drv_data->read = drv_data->rx ? chip->read : null_reader;
+        drv_data->cs_change = transfer->cs_change;
+        message->state = RUNNING_STATE;
+
+        /* Try to map dma buffer and do a dma transfer if successful */
+        if ((drv_data->dma_mapped = map_dma_buffers(drv_data))) {
+
+                /* Ensure we have the correct interrupt handler */
+                drv_data->transfer_handler = dma_transfer;
+
+                /* Setup rx DMA Channel */
+                DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
+                DSADR(drv_data->rx_channel) = drv_data->ssdr_physical;
+                DTADR(drv_data->rx_channel) = drv_data->rx_dma;
+                if (drv_data->rx == drv_data->null_dma_buf)
+                        /* No target address increment */
+                        DCMD(drv_data->rx_channel) = DCMD_FLOWSRC
+                                                        | chip->dma_width
+                                                        | chip->dma_burst_size
+                                                        | drv_data->len;
+                else
+                        DCMD(drv_data->rx_channel) = DCMD_INCTRGADDR
+                                                        | DCMD_FLOWSRC
+                                                        | chip->dma_width
+                                                        | chip->dma_burst_size
+                                                        | drv_data->len;
+
+                /* Setup tx DMA Channel */
+                DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
+                DSADR(drv_data->tx_channel) = drv_data->tx_dma;
+                DTADR(drv_data->tx_channel) = drv_data->ssdr_physical;
+                if (drv_data->tx == drv_data->null_dma_buf)
+                        /* No source address increment */
+                        DCMD(drv_data->tx_channel) = DCMD_FLOWTRG
+                                                        | chip->dma_width
+                                                        | chip->dma_burst_size
+                                                        | drv_data->len;
+                else
+                        DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR
+                                                        | DCMD_FLOWTRG
+                                                        | chip->dma_width
+                                                        | chip->dma_burst_size
+                                                        | drv_data->len;
+
+                /* Enable dma end irqs on SSP to detect end of transfer */
+                if (drv_data->ssp_type == PXA25x_SSP)
+                        DCMD(drv_data->tx_channel) |= DCMD_ENDIRQEN;
+
+                /* Fix me, need to handle cs polarity */
+                drv_data->cs_control(PXA2XX_CS_ASSERT);
+
+                /* Go baby, go */
+                write_SSSR(drv_data->clear_sr, reg);
+                DCSR(drv_data->rx_channel) |= DCSR_RUN;
+                DCSR(drv_data->tx_channel) |= DCSR_RUN;
+                if (drv_data->ssp_type != PXA25x_SSP)
+                        write_SSTO(chip->timeout, reg);
+                write_SSCR1(chip->cr1
+                                | chip->dma_threshold
+                                | drv_data->dma_cr1,
+                                reg);
+        } else {
+                /* Ensure we have the correct interrupt handler */
+                drv_data->transfer_handler = interrupt_transfer;
+
+                /* Fix me, need to handle cs polarity */
+                drv_data->cs_control(PXA2XX_CS_ASSERT);
+
+                /* Go baby, go */
+                write_SSSR(drv_data->clear_sr, reg);
+                if (drv_data->ssp_type != PXA25x_SSP)
+                        write_SSTO(chip->timeout, reg);
+                write_SSCR1(chip->cr1
+                                | chip->threshold
+                                | drv_data->int_cr1,
+                                reg);
+        }
+}
+
+static void pump_messages(void *data)
+{
+        struct driver_data *drv_data = data;
+        unsigned long flags;
+
+        /* Lock queue and check for queue work */
+        spin_lock_irqsave(&drv_data->lock, flags);
+        if (list_empty(&drv_data->queue) || drv_data->run == QUEUE_STOPPED) {
+                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);
+        list_del_init(&drv_data->cur_msg->queue);
+        drv_data->busy = 1;
+        spin_unlock_irqrestore(&drv_data->lock, flags);
+
+        /* 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);
+
+        /* Setup the SSP using the per chip configuration */
+        drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
+        restore_state(drv_data);
+
+        /* Mark as busy and launch transfers */
+        tasklet_schedule(&drv_data->pump_transfers);
+}
+
+static int transfer(struct spi_device *spi, struct spi_message *msg)
+{
+        struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+        unsigned long flags;
+
+        spin_lock_irqsave(&drv_data->lock, flags);
+
+        if (drv_data->run == QUEUE_STOPPED) {
+                spin_unlock_irqrestore(&drv_data->lock, flags);
+                return -ESHUTDOWN;
+        }
+
+        msg->actual_length = 0;
+        msg->status = -EINPROGRESS;
+        msg->state = START_STATE;
+
+        list_add_tail(&msg->queue, &drv_data->queue);
+
+        if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
+                queue_work(drv_data->workqueue, &drv_data->pump_messages);
+
+        spin_unlock_irqrestore(&drv_data->lock, flags);
+
+        return 0;
+}
+
+static int setup(struct spi_device *spi)
+{
+        struct pxa2xx_spi_chip *chip_info = NULL;
+        struct chip_data *chip;
+        struct driver_data *drv_data = spi_master_get_devdata(spi->master);
+        unsigned int clk_div;
+
+        if (!spi->bits_per_word)
+                spi->bits_per_word = 8;
+
+        if (drv_data->ssp_type != PXA25x_SSP
+                        && (spi->bits_per_word < 4 || spi->bits_per_word > 32))
+                return -EINVAL;
+        else if (spi->bits_per_word < 4 || spi->bits_per_word > 16)
+                return -EINVAL;
+
+        /* Only alloc (or use chip_info) on first setup */
+        chip = spi_get_ctldata(spi);
+        if (chip == NULL) {
+                chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL);
+                if (!chip)
+                        return -ENOMEM;
+
+                chip->cs_control = null_cs_control;
+                chip->enable_dma = 0;
+                chip->timeout = 5;
+                chip->threshold = SSCR1_RxTresh(1) | SSCR1_TxTresh(1);
+                chip->dma_burst_size = drv_data->master_info->enable_dma ?
+                                        DCMD_BURST8 : 0;
+
+                chip_info = spi->controller_data;
+        }
+
+        /* chip_info isn't always needed */
+        if (chip_info) {
+                if (chip_info->cs_control)
+                        chip->cs_control = chip_info->cs_control;
+
+                chip->timeout = (chip_info->timeout_microsecs * 10000) / 2712;
+
+                chip->threshold = SSCR1_RxTresh(chip_info->rx_threshold)
+                                        | SSCR1_TxTresh(chip_info->tx_threshold);
+
+                chip->enable_dma = chip_info->dma_burst_size != 0
+                                        && drv_data->master_info->enable_dma;
+                chip->dma_threshold = 0;
+
+                if (chip->enable_dma) {
+                        if (chip_info->dma_burst_size <= 8) {
+                                chip->dma_threshold = SSCR1_RxTresh(8)
+                                                        | SSCR1_TxTresh(8);
+                                chip->dma_burst_size = DCMD_BURST8;
+                        } else if (chip_info->dma_burst_size <= 16) {
+                                chip->dma_threshold = SSCR1_RxTresh(16)
+                                                        | SSCR1_TxTresh(16);
+                                chip->dma_burst_size = DCMD_BURST16;
+                        } else {
+                                chip->dma_threshold = SSCR1_RxTresh(32)
+                                                        | SSCR1_TxTresh(32);
+                                chip->dma_burst_size = DCMD_BURST32;
+                        }
+                }
+
+
+                if (chip_info->enable_loopback)
+                        chip->cr1 = SSCR1_LBM;
+        }
+
+        if (drv_data->ioaddr == SSP1_VIRT)
+                clk_div = SSP1_SerClkDiv(spi->max_speed_hz);
+        else if (drv_data->ioaddr == SSP2_VIRT)
+                clk_div = SSP2_SerClkDiv(spi->max_speed_hz);
+        else if (drv_data->ioaddr == SSP3_VIRT)
+                clk_div = SSP3_SerClkDiv(spi->max_speed_hz);
+        else
+                return -ENODEV;
+
+        chip->cr0 = clk_div
+                        | SSCR0_Motorola
+                        | SSCR0_DataSize(spi->bits_per_word & 0x0f)
+                        | SSCR0_SSE
+                        | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0);
+        chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) << 4)
+                        | (((spi->mode & SPI_CPOL) != 0) << 3);
+
+        /* NOTE:  PXA25x_SSP _could_ use external clocking ... */
+        if (drv_data->ssp_type != PXA25x_SSP)
+                dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
+                                spi->bits_per_word,
+                                (CLOCK_SPEED_HZ)
+                                        / (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
+                                spi->mode & 0x3);
+        else
+                dev_dbg(&spi->dev, "%d bits/word, %d Hz, mode %d\n",
+                                spi->bits_per_word,
+                                (CLOCK_SPEED_HZ/2)
+                                        / (1 + ((chip->cr0 & SSCR0_SCR) >> 8)),
+                                spi->mode & 0x3);
+
+        if (spi->bits_per_word <= 8) {
+                chip->n_bytes = 1;
+                chip->dma_width = DCMD_WIDTH1;
+                chip->read = u8_reader;
+                chip->write = u8_writer;
+        } else if (spi->bits_per_word <= 16) {
+                chip->n_bytes = 2;
+                chip->dma_width = DCMD_WIDTH2;
+                chip->read = u16_reader;
+                chip->write = u16_writer;
+        } else if (spi->bits_per_word <= 32) {
+                chip->cr0 |= SSCR0_EDSS;
+                chip->n_bytes = 4;
+                chip->dma_width = DCMD_WIDTH4;
+                chip->read = u32_reader;
+                chip->write = u32_writer;
+        } else {
+                dev_err(&spi->dev, "invalid wordsize\n");
+                kfree(chip);
+                return -ENODEV;
+        }
+
+        spi_set_ctldata(spi, chip);
+
+        return 0;
+}
+
+static void cleanup(const struct spi_device *spi)
+{
+        struct chip_data *chip = spi_get_ctldata((struct spi_device *)spi);
+
+        kfree(chip);
+}
+
+static int init_queue(struct driver_data *drv_data)
+{
+        INIT_LIST_HEAD(&drv_data->queue);
+        spin_lock_init(&drv_data->lock);
+
+        drv_data->run = QUEUE_STOPPED;
+        drv_data->busy = 0;
+
+        tasklet_init(&drv_data->pump_transfers,
+                        pump_transfers, (unsigned long)drv_data);
+
+        INIT_WORK(&drv_data->pump_messages, pump_messages, drv_data);
+        drv_data->workqueue = create_singlethread_workqueue(
+                                        drv_data->master->cdev.dev->bus_id);
+        if (drv_data->workqueue == NULL)
+                return -EBUSY;
+
+        return 0;
+}
+
+static int start_queue(struct driver_data *drv_data)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&drv_data->lock, flags);
+
+        if (drv_data->run == QUEUE_RUNNING || drv_data->busy) {
+                spin_unlock_irqrestore(&drv_data->lock, flags);
+                return -EBUSY;
+        }
+
+        drv_data->run = QUEUE_RUNNING;
+        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 int stop_queue(struct driver_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->run = QUEUE_STOPPED;
+        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 int destroy_queue(struct driver_data *drv_data)
+{
+        int status;
+
+        status = stop_queue(drv_data);
+        if (status != 0)
+                return status;
+
+        destroy_workqueue(drv_data->workqueue);
+
+        return 0;
+}
+
+static int pxa2xx_spi_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct pxa2xx_spi_master *platform_info;
+        struct spi_master *master;
+        struct driver_data *drv_data = 0;
+        struct resource *memory_resource;
+        int irq;
+        int status = 0;
+
+        platform_info = dev->platform_data;
+
+        if (platform_info->ssp_type == SSP_UNDEFINED) {
+                dev_err(&pdev->dev, "undefined SSP\n");
+                return -ENODEV;
+        }
+
+        /* Allocate master with space for drv_data and null dma buffer */
+        master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
+        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;
+
+        master->bus_num = pdev->id;
+        master->num_chipselect = platform_info->num_chipselect;
+        master->cleanup = cleanup;
+        master->setup = setup;
+        master->transfer = transfer;
+
+        drv_data->ssp_type = platform_info->ssp_type;
+        drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data +
+                                                sizeof(struct driver_data)), 8);
+
+        /* Setup register addresses */
+        memory_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!memory_resource) {
+                dev_err(&pdev->dev, "memory resources not defined\n");
+                status = -ENODEV;
+                goto out_error_master_alloc;
+        }
+
+        drv_data->ioaddr = (void *)io_p2v(memory_resource->start);
+        drv_data->ssdr_physical = memory_resource->start + 0x00000010;
+        if (platform_info->ssp_type == PXA25x_SSP) {
+                drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE;
+                drv_data->dma_cr1 = 0;
+                drv_data->clear_sr = SSSR_ROR;
+                drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
+        } else {
+                drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
+                drv_data->dma_cr1 = SSCR1_TSRE | SSCR1_RSRE | SSCR1_TINTE;
+                drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
+                drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR;
+        }
+
+        /* Attach to IRQ */
+        irq = platform_get_irq(pdev, 0);
+        if (irq < 0) {
+                dev_err(&pdev->dev, "irq resource not defined\n");
+                status = -ENODEV;
+                goto out_error_master_alloc;
+        }
+
+        status = request_irq(irq, ssp_int, SA_INTERRUPT, dev->bus_id, drv_data);
+        if (status < 0) {
+                dev_err(&pdev->dev, "can not get IRQ\n");
+                goto out_error_master_alloc;
+        }
+
+        /* Setup DMA if requested */
+        drv_data->tx_channel = -1;
+        drv_data->rx_channel = -1;
+        if (platform_info->enable_dma) {
+
+                /* Get two DMA channels (rx and tx) */
+                drv_data->rx_channel = pxa_request_dma("pxa2xx_spi_ssp_rx",
+                                                        DMA_PRIO_HIGH,
+                                                        dma_handler,
+                                                        drv_data);
+                if (drv_data->rx_channel < 0) {
+                        dev_err(dev, "problem (%d) requesting rx channel\n",
+                                drv_data->rx_channel);
+                        status = -ENODEV;
+                        goto out_error_irq_alloc;
+                }
+                drv_data->tx_channel = pxa_request_dma("pxa2xx_spi_ssp_tx",
+                                                        DMA_PRIO_MEDIUM,
+                                                        dma_handler,
+                                                        drv_data);
+                if (drv_data->tx_channel < 0) {
+                        dev_err(dev, "problem (%d) requesting tx channel\n",
+                                drv_data->tx_channel);
+                        status = -ENODEV;
+                        goto out_error_dma_alloc;
+                }
+
+                if (drv_data->ioaddr == SSP1_VIRT) {
+                                DRCMRRXSSDR = DRCMR_MAPVLD
+                                                | drv_data->rx_channel;
+                                DRCMRTXSSDR = DRCMR_MAPVLD
+                                                | drv_data->tx_channel;
+                } else if (drv_data->ioaddr == SSP2_VIRT) {
+                                DRCMRRXSS2DR = DRCMR_MAPVLD
+                                                | drv_data->rx_channel;
+                                DRCMRTXSS2DR = DRCMR_MAPVLD
+                                                | drv_data->tx_channel;
+                } else if (drv_data->ioaddr == SSP3_VIRT) {
+                                DRCMRRXSS3DR = DRCMR_MAPVLD
+                                                | drv_data->rx_channel;
+                                DRCMRTXSS3DR = DRCMR_MAPVLD
+                                                | drv_data->tx_channel;
+                } else {
+                        dev_err(dev, "bad SSP type\n");
+                        goto out_error_dma_alloc;
+                }
+        }
+
+        /* Enable SOC clock */
+        pxa_set_cken(platform_info->clock_enable, 1);
+
+        /* Load default SSP configuration */
+        write_SSCR0(0, drv_data->ioaddr);
+        write_SSCR1(SSCR1_RxTresh(4) | SSCR1_TxTresh(12), drv_data->ioaddr);
+        write_SSCR0(SSCR0_SerClkDiv(2)
+                        | SSCR0_Motorola
+                        | SSCR0_DataSize(8),
+                        drv_data->ioaddr);
+        if (drv_data->ssp_type != PXA25x_SSP)
+                write_SSTO(0, drv_data->ioaddr);
+        write_SSPSP(0, drv_data->ioaddr);
+
+        /* Initial and start queue */
+        status = init_queue(drv_data);
+        if (status != 0) {
+                dev_err(&pdev->dev, "problem initializing queue\n");
+                goto out_error_clock_enabled;
+        }
+        status = start_queue(drv_data);
+        if (status != 0) {
+                dev_err(&pdev->dev, "problem starting queue\n");
+                goto out_error_clock_enabled;
+        }
+
+        /* Register with the SPI framework */
+        platform_set_drvdata(pdev, drv_data);
+        status = spi_register_master(master);
+        if (status != 0) {
+                dev_err(&pdev->dev, "problem registering spi master\n");
+                goto out_error_queue_alloc;
+        }
+
+        return status;
+
+out_error_queue_alloc:
+        destroy_queue(drv_data);
+
+out_error_clock_enabled:
+        pxa_set_cken(platform_info->clock_enable, 0);
+
+out_error_dma_alloc:
+        if (drv_data->tx_channel != -1)
+                pxa_free_dma(drv_data->tx_channel);
+        if (drv_data->rx_channel != -1)
+                pxa_free_dma(drv_data->rx_channel);
+
+out_error_irq_alloc:
+        free_irq(irq, drv_data);
+
+out_error_master_alloc:
+        spi_master_put(master);
+        return status;
+}
+
+static int pxa2xx_spi_remove(struct platform_device *pdev)
+{
+        struct driver_data *drv_data = platform_get_drvdata(pdev);
+        int irq;
+        int status = 0;
+
+        if (!drv_data)
+                return 0;
+
+        /* Remove the queue */
+        status = destroy_queue(drv_data);
+        if (status != 0)
+                return status;
+
+        /* Disable the SSP at the peripheral and SOC level */
+        write_SSCR0(0, drv_data->ioaddr);
+        pxa_set_cken(drv_data->master_info->clock_enable, 0);
+
+        /* Release DMA */
+        if (drv_data->master_info->enable_dma) {
+                if (drv_data->ioaddr == SSP1_VIRT) {
+                        DRCMRRXSSDR = 0;
+                        DRCMRTXSSDR = 0;
+                } else if (drv_data->ioaddr == SSP2_VIRT) {
+                        DRCMRRXSS2DR = 0;
+                        DRCMRTXSS2DR = 0;
+                } else if (drv_data->ioaddr == SSP3_VIRT) {
+                        DRCMRRXSS3DR = 0;
+                        DRCMRTXSS3DR = 0;
+                }
+                pxa_free_dma(drv_data->tx_channel);
+                pxa_free_dma(drv_data->rx_channel);
+        }
+
+        /* Release IRQ */
+        irq = platform_get_irq(pdev, 0);
+        if (irq >= 0)
+                free_irq(irq, drv_data);
+
+        /* Disconnect from the SPI framework */
+        spi_unregister_master(drv_data->master);
+
+        /* Prevent double remove */
+        platform_set_drvdata(pdev, NULL);
+
+        return 0;
+}
+
+static void pxa2xx_spi_shutdown(struct platform_device *pdev)
+{
+        int status = 0;
+
+        if ((status = pxa2xx_spi_remove(pdev)) != 0)
+                dev_err(&pdev->dev, "shutdown failed with %d\n", status);
+}
+
+#ifdef CONFIG_PM
+static int suspend_devices(struct device *dev, void *pm_message)
+{
+        pm_message_t *state = pm_message;
+
+        if (dev->power.power_state.event != state->event) {
+                dev_warn(dev, "pm state does not match request\n");
+                return -1;
+        }
+
+        return 0;
+}
+
+static int pxa2xx_spi_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct driver_data *drv_data = platform_get_drvdata(pdev);
+        int status = 0;
+
+        /* Check all childern for current power state */
+        if (device_for_each_child(&pdev->dev, &state, suspend_devices) != 0) {
+                dev_warn(&pdev->dev, "suspend aborted\n");
+                return -1;
+        }
+
+        status = stop_queue(drv_data);
+        if (status != 0)
+                return status;
+        write_SSCR0(0, drv_data->ioaddr);
+        pxa_set_cken(drv_data->master_info->clock_enable, 0);
+
+        return 0;
+}
+
+static int pxa2xx_spi_resume(struct platform_device *pdev)
+{
+        struct driver_data *drv_data = platform_get_drvdata(pdev);
+        int status = 0;
+
+        /* Enable the SSP clock */
+        pxa_set_cken(drv_data->master_info->clock_enable, 1);
+
+        /* Start the queue running */
+        status = start_queue(drv_data);
+        if (status != 0) {
+                dev_err(&pdev->dev, "problem starting queue (%d)\n", status);
+                return status;
+        }
+
+        return 0;
+}
+#else
+#define pxa2xx_spi_suspend NULL
+#define pxa2xx_spi_resume NULL
+#endif /* CONFIG_PM */
+
+static struct platform_driver driver = {
+        .driver = {
+                .name = "pxa2xx-spi",
+                .bus = &platform_bus_type,
+                .owner = THIS_MODULE,
+        },
+        .probe = pxa2xx_spi_probe,
+        .remove = __devexit_p(pxa2xx_spi_remove),
+        .shutdown = pxa2xx_spi_shutdown,
+        .suspend = pxa2xx_spi_suspend,
+        .resume = pxa2xx_spi_resume,
+};
+
+static int __init pxa2xx_spi_init(void)
+{
+        platform_driver_register(&driver);
+
+        return 0;
+}
+module_init(pxa2xx_spi_init);
+
+static void __exit pxa2xx_spi_exit(void)
+{
+        platform_driver_unregister(&driver);
+}
+module_exit(pxa2xx_spi_exit);