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-rw-r--r--drivers/spi/Kconfig34
-rw-r--r--drivers/spi/Makefile4
-rw-r--r--drivers/spi/pxa2xx_spi.c1486
-rw-r--r--drivers/spi/spi.c13
-rw-r--r--drivers/spi/spi_bitbang.c104
-rw-r--r--drivers/spi/spi_butterfly.c1
-rw-r--r--drivers/spi/spi_mpc83xx.c483
-rw-r--r--drivers/spi/spi_s3c24xx.c453
-rw-r--r--drivers/spi/spi_s3c24xx_gpio.c188
9 files changed, 2740 insertions, 26 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 7a75faeb052..23334c8bc4c 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -75,11 +75,45 @@ config SPI_BUTTERFLY
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
+config SPI_MPC83xx
+ tristate "Freescale MPC83xx SPI controller"
+ depends on SPI_MASTER && PPC_83xx && EXPERIMENTAL
+ select SPI_BITBANG
+ help
+ This enables using the Freescale MPC83xx SPI controller in master
+ mode.
+
+ Note, this driver uniquely supports the SPI controller on the MPC83xx
+ family of PowerPC processors. The MPC83xx uses a simple set of shift
+ registers for data (opposed to the CPM based descriptor model).
+
+config SPI_PXA2XX
+ tristate "PXA2xx SSP SPI master"
+ depends on SPI_MASTER && ARCH_PXA && EXPERIMENTAL
+ help
+ This enables using a PXA2xx SSP port as a SPI master controller.
+ The driver can be configured to use any SSP port and additional
+ documentation can be found a Documentation/spi/pxa2xx.
+
+config SPI_S3C24XX_GPIO
+ tristate "Samsung S3C24XX series SPI by GPIO"
+ depends on SPI_MASTER && ARCH_S3C2410 && SPI_BITBANG && EXPERIMENTAL
+ help
+ SPI driver for Samsung S3C24XX series ARM SoCs using
+ GPIO lines to provide the SPI bus. This can be used where
+ the inbuilt hardware cannot provide the transfer mode, or
+ where the board is using non hardware connected pins.
#
# Add new SPI master controllers in alphabetical order above this line
#
+config SPI_S3C24XX
+ tristate "Samsung S3C24XX series SPI"
+ depends on SPI_MASTER && ARCH_S3C2410 && EXPERIMENTAL
+ help
+ SPI driver for Samsung S3C24XX series ARM SoCs
+
#
# There are lots of SPI device types, with sensors and memory
# being probably the most widely used ones.
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index c2c87e845ab..8f4cb67997b 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -13,6 +13,10 @@ obj-$(CONFIG_SPI_MASTER) += spi.o
# SPI master controller drivers (bus)
obj-$(CONFIG_SPI_BITBANG) += spi_bitbang.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi_butterfly.o
+obj-$(CONFIG_SPI_PXA2XX) += pxa2xx_spi.o
+obj-$(CONFIG_SPI_MPC83xx) += spi_mpc83xx.o
+obj-$(CONFIG_SPI_S3C24XX_GPIO) += spi_s3c24xx_gpio.o
+obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24xx.o
# ... add above this line ...
# SPI protocol drivers (device/link on bus)
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c
new file mode 100644
index 00000000000..29aec77f98b
--- /dev/null
+++ b/drivers/spi/pxa2xx_spi.c
@@ -0,0 +1,1486 @@
+/*
+ * 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;
+ u8 n_bytes;
+ u32 dma_width;
+ 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;
+ u8 bits_per_word;
+ u32 speed_hz;
+ 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->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->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(*(u32 *)(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 driver_data *drv_data)
+{
+ struct spi_transfer* last_transfer;
+ unsigned long flags;
+ struct spi_message *msg;
+
+ spin_lock_irqsave(&drv_data->lock, flags);
+ msg = drv_data->cur_msg;
+ drv_data->cur_msg = NULL;
+ drv_data->cur_transfer = NULL;
+ drv_data->cur_chip = NULL;
+ queue_work(drv_data->workqueue, &drv_data->pump_messages);
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+
+ last_transfer = list_entry(msg->transfers.prev,
+ struct spi_transfer,
+ transfer_list);
+
+ if (!last_transfer->cs_change)
+ drv_data->cs_control(PXA2XX_CS_DEASSERT);
+
+ msg->state = NULL;
+ if (msg->complete)
+ msg->complete(msg->context);
+}
+
+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 */
+ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
+ write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+ if (drv_data->ssp_type != PXA25x_SSP)
+ write_SSTO(0, reg);
+ write_SSSR(drv_data->clear_sr, 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_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+ write_SSSR(drv_data->clear_sr, 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*/
+ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
+ write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+ if (drv_data->ssp_type != PXA25x_SSP)
+ write_SSTO(0, reg);
+ write_SSSR(drv_data->clear_sr, 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*/
+ write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
+ if (drv_data->ssp_type != PXA25x_SSP)
+ write_SSTO(0, reg);
+ write_SSSR(drv_data->clear_sr, 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)
+{
+ struct spi_message *msg = drv_data->cur_msg;
+ void *reg = drv_data->ioaddr;
+ unsigned long limit = loops_per_jiffy << 1;
+ u32 irq_status;
+ u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ?
+ drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS;
+
+ while ((irq_status = read_SSSR(reg) & irq_mask)) {
+
+ if (irq_status & SSSR_ROR) {
+
+ /* Clear and disable interrupts */
+ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
+ write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
+ if (drv_data->ssp_type != PXA25x_SSP)
+ write_SSTO(0, reg);
+ write_SSSR(drv_data->clear_sr, reg);
+
+ if (flush(drv_data) == 0)
+ dev_err(&drv_data->pdev->dev,
+ "interrupt_transfer: flush fail\n");
+
+ /* Stop the SSP */
+
+ 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);
+ irq_mask = drv_data->mask_sr & ~SSSR_TFS;
+
+ /* 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 */
+ write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
+ if (drv_data->ssp_type != PXA25x_SSP)
+ write_SSTO(0, reg);
+ write_SSSR(drv_data->clear_sr, 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);
+ }
+ }
+
+ /* We did something */
+ return IRQ_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;
+ void *reg = drv_data->ioaddr;
+
+ if (!drv_data->cur_msg) {
+
+ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
+ write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg);
+ if (drv_data->ssp_type != PXA25x_SSP)
+ write_SSTO(0, reg);
+ write_SSSR(drv_data->clear_sr, reg);
+
+ dev_err(&drv_data->pdev->dev, "bad message state "
+ "in interrupt handler");
+
+ /* 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;
+ u32 clk_div = 0;
+ u8 bits = 0;
+ u32 speed = 0;
+ u32 cr0;
+
+ /* 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(drv_data);
+ return;
+ }
+
+ /* Handle end of message */
+ if (message->state == DONE_STATE) {
+ message->status = 0;
+ giveback(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(drv_data);
+ return;
+ }
+ drv_data->n_bytes = chip->n_bytes;
+ drv_data->dma_width = chip->dma_width;
+ 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;
+
+ /* Change speed and bit per word on a per transfer */
+ if (transfer->speed_hz || transfer->bits_per_word) {
+
+ /* Disable clock */
+ write_SSCR0(chip->cr0 & ~SSCR0_SSE, reg);
+ cr0 = chip->cr0;
+ bits = chip->bits_per_word;
+ speed = chip->speed_hz;
+
+ if (transfer->speed_hz)
+ speed = transfer->speed_hz;
+
+ if (transfer->bits_per_word)
+ bits = transfer->bits_per_word;
+
+ if (reg == SSP1_VIRT)
+ clk_div = SSP1_SerClkDiv(speed);
+ else if (reg == SSP2_VIRT)
+ clk_div = SSP2_SerClkDiv(speed);
+ else if (reg == SSP3_VIRT)
+ clk_div = SSP3_SerClkDiv(speed);
+
+ if (bits <= 8) {
+ drv_data->n_bytes = 1;
+ drv_data->dma_width = DCMD_WIDTH1;
+ drv_data->read = drv_data->read != null_reader ?
+ u8_reader : null_reader;
+ drv_data->write = drv_data->write != null_writer ?
+ u8_writer : null_writer;
+ } else if (bits <= 16) {
+ drv_data->n_bytes = 2;
+ drv_data->dma_width = DCMD_WIDTH2;
+ drv_data->read = drv_data->read != null_reader ?
+ u16_reader : null_reader;
+ drv_data->write = drv_data->write != null_writer ?
+ u16_writer : null_writer;
+ } else if (bits <= 32) {
+ drv_data->n_bytes = 4;
+ drv_data->dma_width = DCMD_WIDTH4;
+ drv_data->read = drv_data->read != null_reader ?
+ u32_reader : null_reader;
+ drv_data->write = drv_data->write != null_writer ?
+ u32_writer : null_writer;
+ }
+
+ cr0 = clk_div
+ | SSCR0_Motorola
+ | SSCR0_DataSize(bits > 16 ? bits - 16 : bits)
+ | SSCR0_SSE
+ | (bits > 16 ? SSCR0_EDSS : 0);
+
+ /* Start it back up */
+ write_SSCR0(cr0, reg);
+ }
+
+ 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
+ | drv_data->dma_width
+ | chip->dma_burst_size
+ | drv_data->len;
+ else
+ DCMD(drv_data->rx_channel) = DCMD_INCTRGADDR
+ | DCMD_FLOWSRC
+ | drv_data->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
+ | drv_data->dma_width
+ | chip->dma_burst_size
+ | drv_data->len;
+ else
+ DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR
+ | DCMD_FLOWTRG
+ | drv_data->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);
+
+ /* 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);
+
+ drv_data->busy = 1;
+ spin_unlock_irqrestore(&drv_data->lock, flags);
+}
+
+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 = SSP_TIMEOUT(1000);
+ 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 = SSP_TIMEOUT(chip_info->timeout_microsecs);
+
+ 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->speed_hz = spi->max_speed_hz;
+
+ chip->cr0 = clk_div
+ | SSCR0_Motorola
+ | SSCR0_DataSize(spi->bits_per_word > 16 ?
+ spi->bits_per_word - 16 : spi->bits_per_word)
+ | 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;
+ }
+ chip->bits_per_word = spi->bits_per_word;
+
+ 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((unsigned long)(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, 0, 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);
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 94f5e8ed83a..1cea4a6799f 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -338,18 +338,18 @@ static struct class spi_master_class = {
* spi_alloc_master - allocate SPI master controller
* @dev: the controller, possibly using the platform_bus
* @size: how much driver-private data to preallocate; the pointer to this
- * memory is in the class_data field of the returned class_device,
+ * memory is in the class_data field of the returned class_device,
* accessible with spi_master_get_devdata().
*
* This call is used only by SPI master controller drivers, which are the
* only ones directly touching chip registers. It's how they allocate
- * an spi_master structure, prior to calling spi_add_master().
+ * an spi_master structure, prior to calling spi_register_master().
*
* This must be called from context that can sleep. It returns the SPI
* master structure on success, else NULL.
*
* The caller is responsible for assigning the bus number and initializing
- * the master's methods before calling spi_add_master(); and (after errors
+ * the master's methods before calling spi_register_master(); and (after errors
* adding the device) calling spi_master_put() to prevent a memory leak.
*/
struct spi_master * __init_or_module
@@ -395,7 +395,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master);
int __init_or_module
spi_register_master(struct spi_master *master)
{
- static atomic_t dyn_bus_id = ATOMIC_INIT(0);
+ static atomic_t dyn_bus_id = ATOMIC_INIT((1<<16) - 1);
struct device *dev = master->cdev.dev;
int status = -ENODEV;
int dynamic = 0;
@@ -404,7 +404,7 @@ spi_register_master(struct spi_master *master)
return -ENODEV;
/* convention: dynamically assigned bus IDs count down from the max */
- if (master->bus_num == 0) {
+ if (master->bus_num < 0) {
master->bus_num = atomic_dec_return(&dyn_bus_id);
dynamic = 1;
}
@@ -522,7 +522,8 @@ int spi_sync(struct spi_device *spi, struct spi_message *message)
}
EXPORT_SYMBOL_GPL(spi_sync);
-#define SPI_BUFSIZ (SMP_CACHE_BYTES)
+/* portable code must never pass more than 32 bytes */
+#define SPI_BUFSIZ max(32,SMP_CACHE_BYTES)
static u8 *buf;
diff --git a/drivers/spi/spi_bitbang.c b/drivers/spi/spi_bitbang.c
index f037e559326..dd2f950b21a 100644
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -138,6 +138,45 @@ static unsigned bitbang_txrx_32(
return t->len - count;
}
+int spi_bitbang_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct spi_bitbang_cs *cs = spi->controller_state;
+ u8 bits_per_word;
+ u32 hz;
+
+ if (t) {
+ bits_per_word = t->bits_per_word;
+ hz = t->speed_hz;
+ } else {
+ bits_per_word = 0;
+ hz = 0;
+ }
+
+ /* spi_transfer level calls that work per-word */
+ if (!bits_per_word)
+ bits_per_word = spi->bits_per_word;
+ if (bits_per_word <= 8)
+ cs->txrx_bufs = bitbang_txrx_8;
+ else if (bits_per_word <= 16)
+ cs->txrx_bufs = bitbang_txrx_16;
+ else if (bits_per_word <= 32)
+ cs->txrx_bufs = bitbang_txrx_32;
+ else
+ return -EINVAL;
+
+ /* nsecs = (clock period)/2 */
+ if (!hz)
+ hz = spi->max_speed_hz;
+ if (hz) {
+ cs->nsecs = (1000000000/2) / hz;
+ if (cs->nsecs > (MAX_UDELAY_MS * 1000 * 1000))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(spi_bitbang_setup_transfer);
+
/**
* spi_bitbang_setup - default setup for per-word I/O loops
*/
@@ -145,8 +184,16 @@ int spi_bitbang_setup(struct spi_device *spi)
{
struct spi_bitbang_cs *cs = spi->controller_state;
struct spi_bitbang *bitbang;
+ int retval;
- if (!spi->max_speed_hz)
+ bitbang = spi_master_get_devdata(spi->master);
+
+ /* REVISIT: some systems will want to support devices using lsb-first
+ * bit encodings on the wire. In pure software that would be trivial,
+ * just bitbang_txrx_le_cphaX() routines shifting the other way, and
+ * some hardware controllers also have this support.
+ */
+ if ((spi->mode & SPI_LSB_FIRST) != 0)
return -EINVAL;
if (!cs) {
@@ -155,32 +202,20 @@ int spi_bitbang_setup(struct spi_device *spi)
return -ENOMEM;
spi->controller_state = cs;
}
- bitbang = spi_master_get_devdata(spi->master);
if (!spi->bits_per_word)
spi->bits_per_word = 8;
- /* spi_transfer level calls that work per-word */
- if (spi->bits_per_word <= 8)
- cs->txrx_bufs = bitbang_txrx_8;
- else if (spi->bits_per_word <= 16)
- cs->txrx_bufs = bitbang_txrx_16;
- else if (spi->bits_per_word <= 32)
- cs->txrx_bufs = bitbang_txrx_32;
- else
- return -EINVAL;
-
/* per-word shift register access, in hardware or bitbanging */
cs->txrx_word = bitbang->txrx_word[spi->mode & (SPI_CPOL|SPI_CPHA)];
if (!cs->txrx_word)
return -EINVAL;
- /* nsecs = (clock period)/2 */
- cs->nsecs = (1000000000/2) / (spi->max_speed_hz);
- if (cs->nsecs > MAX_UDELAY_MS * 1000)
- return -EINVAL;
+ retval = spi_bitbang_setup_transfer(spi, NULL);
+ if (retval < 0)
+ return retval;
- dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec\n",
+ dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec/bit\n",
__FUNCTION__, spi->mode & (SPI_CPOL | SPI_CPHA),
spi->bits_per_word, 2 * cs->nsecs);
@@ -246,6 +281,8 @@ static void bitbang_work(void *_bitbang)
unsigned tmp;
unsigned cs_change;
int status;
+ int (*setup_transfer)(struct spi_device *,
+ struct spi_transfer *);
m = container_of(bitbang->queue.next, struct spi_message,
queue);
@@ -262,6 +299,7 @@ static void bitbang_work(void *_bitbang)
tmp = 0;
cs_change = 1;
status = 0;
+ setup_transfer = NULL;
list_for_each_entry (t, &m->transfers, transfer_list) {
if (bitbang->shutdown) {
@@ -269,6 +307,20 @@ static void bitbang_work(void *_bitbang)
break;
}
+ /* override or restore speed and wordsize */
+ if (t->speed_hz || t->bits_per_word) {
+ setup_transfer = bitbang->setup_transfer;
+ if (!setup_transfer) {
+ status = -ENOPROTOOPT;
+ break;
+ }
+ }
+ if (setup_transfer) {
+ status = setup_transfer(spi, t);
+ if (status < 0)
+ break;
+ }
+
/* set up default clock polarity, and activate chip;
* this implicitly updates clock and spi modes as
* previously recorded for this device via setup().
@@ -325,6 +377,10 @@ static void bitbang_work(void *_bitbang)
m->status = status;
m->complete(m->context);
+ /* restore speed and wordsize */
+ if (setup_transfer)
+ setup_transfer(spi, NULL);
+
/* normally deactivate chipselect ... unless no error and
* cs_change has hinted that the next message will probably
* be for this chip too.
@@ -348,6 +404,7 @@ int spi_bitbang_transfer(struct spi_device *spi, struct spi_message *m)
{
struct spi_bitbang *bitbang;
unsigned long flags;
+ int status = 0;
m->actual_length = 0;
m->status = -EINPROGRESS;
@@ -357,11 +414,15 @@ int spi_bitbang_transfer(struct spi_device *spi, struct spi_message *m)
return -ESHUTDOWN;
spin_lock_irqsave(&bitbang->lock, flags);
- list_add_tail(&m->queue, &bitbang->queue);
- queue_work(bitbang->workqueue, &bitbang->work);
+ if (!spi->max_speed_hz)
+ status = -ENETDOWN;
+ else {
+ list_add_tail(&m->queue, &bitbang->queue);
+ queue_work(bitbang->workqueue, &bitbang->work);
+ }
spin_unlock_irqrestore(&bitbang->lock, flags);
- return 0;
+ return status;
}
EXPORT_SYMBOL_GPL(spi_bitbang_transfer);
@@ -406,6 +467,9 @@ int spi_bitbang_start(struct spi_bitbang *bitbang)
bitbang->use_dma = 0;
bitbang->txrx_bufs = spi_bitbang_bufs;
if (!bitbang->master->setup) {
+ if (!bitbang->setup_transfer)
+ bitbang->setup_transfer =
+ spi_bitbang_setup_transfer;
bitbang->master->setup = spi_bitbang_setup;
bitbang->master->cleanup = spi_bitbang_cleanup;
}
diff --git a/drivers/spi/spi_butterfly.c b/drivers/spi/spi_butterfly.c
index ff9e5faa4dc..a006a1ee27a 100644
--- a/drivers/spi/spi_butterfly.c
+++ b/drivers/spi/spi_butterfly.c
@@ -321,6 +321,7 @@ static void butterfly_attach(struct parport *p)
* (firmware resets at45, acts as spi slave) or neither (we ignore
* both, AVR uses AT45). Here we expect firmware for the first option.
*/
+
pp->info[0].max_speed_hz = 15 * 1000 * 1000;
strcpy(pp->info[0].modalias, "mtd_dataflash");
pp->info[0].platform_data = &flash;
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
new file mode 100644
index 00000000000..5d92a7e5cb4
--- /dev/null
+++ b/drivers/spi/spi_mpc83xx.c
@@ -0,0 +1,483 @@
+/*
+ * MPC83xx SPI controller driver.
+ *
+ * Maintainer: Kumar Gala
+ *
+ * Copyright (C) 2006 Polycom, Inc.
+ *
+ * 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.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/completion.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/device.h>
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+#include <linux/platform_device.h>
+#include <linux/fsl_devices.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+
+/* SPI Controller registers */
+struct mpc83xx_spi_reg {
+ u8 res1[0x20];
+ __be32 mode;
+ __be32 event;
+ __be32 mask;
+ __be32 command;
+ __be32 transmit;
+ __be32 receive;
+};
+
+/* SPI Controller mode register definitions */
+#define SPMODE_CI_INACTIVEHIGH (1 << 29)
+#define SPMODE_CP_BEGIN_EDGECLK (1 << 28)
+#define SPMODE_DIV16 (1 << 27)
+#define SPMODE_REV (1 << 26)
+#define SPMODE_MS (1 << 25)
+#define SPMODE_ENABLE (1 << 24)
+#define SPMODE_LEN(x) ((x) << 20)
+#define SPMODE_PM(x) ((x) << 16)
+
+/*
+ * Default for SPI Mode:
+ * SPI MODE 0 (inactive low, phase middle, MSB, 8-bit length, slow clk
+ */
+#define SPMODE_INIT_VAL (SPMODE_CI_INACTIVEHIGH | SPMODE_DIV16 | SPMODE_REV | \
+ SPMODE_MS | SPMODE_LEN(7) | SPMODE_PM(0xf))
+
+/* SPIE register values */
+#define SPIE_NE 0x00000200 /* Not empty */
+#define SPIE_NF 0x00000100 /* Not full */
+
+/* SPIM register values */
+#define SPIM_NE 0x00000200 /* Not empty */
+#define SPIM_NF 0x00000100 /* Not full */
+
+/* SPI Controller driver's private data. */
+struct mpc83xx_spi {
+ /* bitbang has to be first */
+ struct spi_bitbang bitbang;
+ struct completion done;
+
+ struct mpc83xx_spi_reg __iomem *base;
+
+ /* rx & tx bufs from the spi_transfer */
+ const void *tx;
+ void *rx;
+
+ /* functions to deal with different sized buffers */
+ void (*get_rx) (u32 rx_data, struct mpc83xx_spi *);
+ u32(*get_tx) (struct mpc83xx_spi *);
+
+ unsigned int count;
+ u32 irq;
+
+ unsigned nsecs; /* (clock cycle time)/2 */
+
+ u32 sysclk;
+ void (*activate_cs) (u8 cs, u8 polarity);
+ void (*deactivate_cs) (u8 cs, u8 polarity);
+};
+
+static inline void mpc83xx_spi_write_reg(__be32 __iomem * reg, u32 val)
+{
+ out_be32(reg, val);
+}
+
+static inline u32 mpc83xx_spi_read_reg(__be32 __iomem * reg)
+{
+ return in_be32(reg);
+}
+
+#define MPC83XX_SPI_RX_BUF(type) \
+void mpc83xx_spi_rx_buf_##type(u32 data, struct mpc83xx_spi *mpc83xx_spi) \
+{ \
+ type * rx = mpc83xx_spi->rx; \
+ *rx++ = (type)data; \
+ mpc83xx_spi->rx = rx; \
+}
+
+#define MPC83XX_SPI_TX_BUF(type) \
+u32 mpc83xx_spi_tx_buf_##type(struct mpc83xx_spi *mpc83xx_spi) \
+{ \
+ u32 data; \
+ const type * tx = mpc83xx_spi->tx; \
+ data = *tx++; \
+ mpc83xx_spi->tx = tx; \
+ return data; \
+}
+
+MPC83XX_SPI_RX_BUF(u8)
+MPC83XX_SPI_RX_BUF(u16)
+MPC83XX_SPI_RX_BUF(u32)
+MPC83XX_SPI_TX_BUF(u8)
+MPC83XX_SPI_TX_BUF(u16)
+MPC83XX_SPI_TX_BUF(u32)
+
+static void mpc83xx_spi_chipselect(struct spi_device *spi, int value)
+{
+ struct mpc83xx_spi *mpc83xx_spi;
+ u8 pol = spi->mode & SPI_CS_HIGH ? 1 : 0;
+
+ mpc83xx_spi = spi_master_get_devdata(spi->master);
+
+ if (value == BITBANG_CS_INACTIVE) {
+ if (mpc83xx_spi->deactivate_cs)
+ mpc83xx_spi->deactivate_cs(spi->chip_select, pol);
+ }
+
+ if (value == BITBANG_CS_ACTIVE) {
+ u32 regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
+ u32 len = spi->bits_per_word;
+ if (len == 32)
+ len = 0;
+ else
+ len = len - 1;
+
+ /* mask out bits we are going to set */
+ regval &= ~0x38ff0000;
+
+ if (spi->mode & SPI_CPHA)
+ regval |= SPMODE_CP_BEGIN_EDGECLK;
+ if (spi->mode & SPI_CPOL)
+ regval |= SPMODE_CI_INACTIVEHIGH;
+
+ regval |= SPMODE_LEN(len);
+
+ if ((mpc83xx_spi->sysclk / spi->max_speed_hz) >= 64) {
+ u8 pm = mpc83xx_spi->sysclk / (spi->max_speed_hz * 64);
+ regval |= SPMODE_PM(pm) | SPMODE_DIV16;
+ } else {
+ u8 pm = mpc83xx_spi->sysclk / (spi->max_speed_hz * 4);
+ regval |= SPMODE_PM(pm);
+ }
+
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
+ if (mpc83xx_spi->activate_cs)
+ mpc83xx_spi->activate_cs(spi->chip_select, pol);
+ }
+}
+
+static
+int mpc83xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct mpc83xx_spi *mpc83xx_spi;
+ u32 regval;
+ u8 bits_per_word;
+ u32 hz;
+
+ mpc83xx_spi = spi_master_get_devdata(spi->master);
+
+ if (t) {
+ bits_per_word = t->bits_per_word;
+ hz = t->speed_hz;
+ } else {
+ bits_per_word = 0;
+ hz = 0;
+ }
+
+ /* spi_transfer level calls that work per-word */
+ if (!bits_per_word)
+ bits_per_word = spi->bits_per_word;
+
+ /* Make sure its a bit width we support [4..16, 32] */
+ if ((bits_per_word < 4)
+ || ((bits_per_word > 16) && (bits_per_word != 32)))
+ return -EINVAL;
+
+ if (bits_per_word <= 8) {
+ mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
+ mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
+ } else if (bits_per_word <= 16) {
+ mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u16;
+ mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u16;
+ } else if (bits_per_word <= 32) {
+ mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u32;
+ mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u32;
+ } else
+ return -EINVAL;
+
+ /* nsecs = (clock period)/2 */
+ if (!hz)
+ hz = spi->max_speed_hz;
+ mpc83xx_spi->nsecs = (1000000000 / 2) / hz;
+ if (mpc83xx_spi->nsecs > MAX_UDELAY_MS * 1000)
+ return -EINVAL;
+
+ if (bits_per_word == 32)
+ bits_per_word = 0;
+ else
+ bits_per_word = bits_per_word - 1;
+
+ regval = mpc83xx_spi_read_reg(&mpc83xx_spi->base->mode);
+
+ /* Mask out bits_per_wordgth */
+ regval &= 0xff0fffff;
+ regval |= SPMODE_LEN(bits_per_word);
+
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
+
+ return 0;
+}
+
+static int mpc83xx_spi_setup(struct spi_device *spi)
+{
+ struct spi_bitbang *bitbang;
+ struct mpc83xx_spi *mpc83xx_spi;
+ int retval;
+
+ if (!spi->max_speed_hz)
+ return -EINVAL;
+
+ bitbang = spi_master_get_devdata(spi->master);
+ mpc83xx_spi = spi_master_get_devdata(spi->master);
+
+ if (!spi->bits_per_word)
+ spi->bits_per_word = 8;
+
+ retval = mpc83xx_spi_setup_transfer(spi, NULL);
+ if (retval < 0)
+ return retval;
+
+ dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u nsec\n",
+ __FUNCTION__, spi->mode & (SPI_CPOL | SPI_CPHA),
+ spi->bits_per_word, 2 * mpc83xx_spi->nsecs);
+
+ /* NOTE we _need_ to call chipselect() early, ideally with adapter
+ * setup, unless the hardware defaults cooperate to avoid confusion
+ * between normal (active low) and inverted chipselects.
+ */
+
+ /* deselect chip (low or high) */
+ spin_lock(&bitbang->lock);
+ if (!bitbang->busy) {
+ bitbang->chipselect(spi, BITBANG_CS_INACTIVE);
+ ndelay(mpc83xx_spi->nsecs);
+ }
+ spin_unlock(&bitbang->lock);
+
+ return 0;
+}
+
+static int mpc83xx_spi_bufs(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct mpc83xx_spi *mpc83xx_spi;
+ u32 word;
+
+ mpc83xx_spi = spi_master_get_devdata(spi->master);
+
+ mpc83xx_spi->tx = t->tx_buf;
+ mpc83xx_spi->rx = t->rx_buf;
+ mpc83xx_spi->count = t->len;
+ INIT_COMPLETION(mpc83xx_spi->done);
+
+ /* enable rx ints */
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, SPIM_NE);
+
+ /* transmit word */
+ word = mpc83xx_spi->get_tx(mpc83xx_spi);
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit, word);
+
+ wait_for_completion(&mpc83xx_spi->done);
+
+ /* disable rx ints */
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0);
+
+ return t->len - mpc83xx_spi->count;
+}
+
+irqreturn_t mpc83xx_spi_irq(s32 irq, void *context_data,
+ struct pt_regs * ptregs)
+{
+ struct mpc83xx_spi *mpc83xx_spi = context_data;
+ u32 event;
+ irqreturn_t ret = IRQ_NONE;
+
+ /* Get interrupt events(tx/rx) */
+ event = mpc83xx_spi_read_reg(&mpc83xx_spi->base->event);
+
+ /* We need handle RX first */
+ if (event & SPIE_NE) {
+ u32 rx_data = mpc83xx_spi_read_reg(&mpc83xx_spi->base->receive);
+
+ if (mpc83xx_spi->rx)
+ mpc83xx_spi->get_rx(rx_data, mpc83xx_spi);
+
+ ret = IRQ_HANDLED;
+ }
+
+ if ((event & SPIE_NF) == 0)
+ /* spin until TX is done */
+ while (((event =
+ mpc83xx_spi_read_reg(&mpc83xx_spi->base->event)) &
+ SPIE_NF) == 0)
+ cpu_relax();
+
+ mpc83xx_spi->count -= 1;
+ if (mpc83xx_spi->count) {
+ if (mpc83xx_spi->tx) {
+ u32 word = mpc83xx_spi->get_tx(mpc83xx_spi);
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->transmit,
+ word);
+ }
+ } else {
+ complete(&mpc83xx_spi->done);
+ }
+
+ /* Clear the events */
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->event, event);
+
+ return ret;
+}
+
+static int __init mpc83xx_spi_probe(struct platform_device *dev)
+{
+ struct spi_master *master;
+ struct mpc83xx_spi *mpc83xx_spi;
+ struct fsl_spi_platform_data *pdata;
+ struct resource *r;
+ u32 regval;
+ int ret = 0;
+
+ /* Get resources(memory, IRQ) associated with the device */
+ master = spi_alloc_master(&dev->dev, sizeof(struct mpc83xx_spi));
+
+ if (master == NULL) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ platform_set_drvdata(dev, master);
+ pdata = dev->dev.platform_data;
+
+ if (pdata == NULL) {
+ ret = -ENODEV;
+ goto free_master;
+ }
+
+ r = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (r == NULL) {
+ ret = -ENODEV;
+ goto free_master;
+ }
+
+ mpc83xx_spi = spi_master_get_devdata(master);
+ mpc83xx_spi->bitbang.master = spi_master_get(master);
+ mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
+ mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
+ mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
+ mpc83xx_spi->sysclk = pdata->sysclk;
+ mpc83xx_spi->activate_cs = pdata->activate_cs;
+ mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
+ mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
+ mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
+
+ mpc83xx_spi->bitbang.master->setup = mpc83xx_spi_setup;
+ init_completion(&mpc83xx_spi->done);
+
+ mpc83xx_spi->base = ioremap(r->start, r->end - r->start + 1);
+ if (mpc83xx_spi->base == NULL) {
+ ret = -ENOMEM;
+ goto put_master;
+ }
+
+ mpc83xx_spi->irq = platform_get_irq(dev, 0);
+
+ if (mpc83xx_spi->irq < 0) {
+ ret = -ENXIO;
+ goto unmap_io;
+ }
+
+ /* Register for SPI Interrupt */
+ ret = request_irq(mpc83xx_spi->irq, mpc83xx_spi_irq,
+ 0, "mpc83xx_spi", mpc83xx_spi);
+
+ if (ret != 0)
+ goto unmap_io;
+
+ master->bus_num = pdata->bus_num;
+ master->num_chipselect = pdata->max_chipselect;
+
+ /* SPI controller initializations */
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, 0);
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mask, 0);
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->command, 0);
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->event, 0xffffffff);
+
+ /* Enable SPI interface */
+ regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
+ mpc83xx_spi_write_reg(&mpc83xx_spi->base->mode, regval);
+
+ ret = spi_bitbang_start(&mpc83xx_spi->bitbang);
+
+ if (ret != 0)
+ goto free_irq;
+
+ printk(KERN_INFO
+ "%s: MPC83xx SPI Controller driver at 0x%p (irq = %d)\n",
+ dev->dev.bus_id, mpc83xx_spi->base, mpc83xx_spi->irq);
+
+ return ret;
+
+free_irq:
+ free_irq(mpc83xx_spi->irq, mpc83xx_spi);
+unmap_io:
+ iounmap(mpc83xx_spi->base);
+put_master:
+ spi_master_put(master);
+free_master:
+ kfree(master);
+err:
+ return ret;
+}
+
+static int __devexit mpc83xx_spi_remove(struct platform_device *dev)
+{
+ struct mpc83xx_spi *mpc83xx_spi;
+ struct spi_master *master;
+
+ master = platform_get_drvdata(dev);
+ mpc83xx_spi = spi_master_get_devdata(master);
+
+ spi_bitbang_stop(&mpc83xx_spi->bitbang);
+ free_irq(mpc83xx_spi->irq, mpc83xx_spi);
+ iounmap(mpc83xx_spi->base);
+ spi_master_put(mpc83xx_spi->bitbang.master);
+
+ return 0;
+}
+
+static struct platform_driver mpc83xx_spi_driver = {
+ .probe = mpc83xx_spi_probe,
+ .remove = __devexit_p(mpc83xx_spi_remove),
+ .driver = {
+ .name = "mpc83xx_spi",
+ },
+};
+
+static int __init mpc83xx_spi_init(void)
+{
+ return platform_driver_register(&mpc83xx_spi_driver);
+}
+
+static void __exit mpc83xx_spi_exit(void)
+{
+ platform_driver_unregister(&mpc83xx_spi_driver);
+}
+
+module_init(mpc83xx_spi_init);
+module_exit(mpc83xx_spi_exit);
+
+MODULE_AUTHOR("Kumar Gala");
+MODULE_DESCRIPTION("Simple MPC83xx SPI Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/spi/spi_s3c24xx.c b/drivers/spi/spi_s3c24xx.c
new file mode 100644
index 00000000000..9de4b5a04d7
--- /dev/null
+++ b/drivers/spi/spi_s3c24xx.c
@@ -0,0 +1,453 @@
+/* linux/drivers/spi/spi_s3c24xx.c
+ *
+ * Copyright (c) 2006 Ben Dooks
+ * Copyright (c) 2006 Simtec Electronics
+ * Ben Dooks <ben@simtec.co.uk>
+ *
+ * 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.
+ *
+*/
+
+
+//#define DEBUG
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/hardware.h>
+
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/regs-spi.h>
+#include <asm/arch/spi.h>
+
+struct s3c24xx_spi {
+ /* bitbang has to be first */
+ struct spi_bitbang bitbang;
+ struct completion done;
+
+ void __iomem *regs;
+ int irq;
+ int len;
+ int count;
+
+ /* data buffers */
+ const unsigned char *tx;
+ unsigned char *rx;
+
+ struct clk *clk;
+ struct resource *ioarea;
+ struct spi_master *master;
+ struct spi_device *curdev;
+ struct device *dev;
+ struct s3c2410_spi_info *pdata;
+};
+
+#define SPCON_DEFAULT (S3C2410_SPCON_MSTR | S3C2410_SPCON_SMOD_INT)
+#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP)
+
+static inline struct s3c24xx_spi *to_hw(struct spi_device *sdev)
+{
+ return spi_master_get_devdata(sdev->master);
+}
+
+static void s3c24xx_spi_chipsel(struct spi_device *spi, int value)
+{
+ struct s3c24xx_spi *hw = to_hw(spi);
+ unsigned int cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
+ unsigned int spcon;
+
+ switch (value) {
+ case BITBANG_CS_INACTIVE:
+ if (hw->pdata->set_cs)
+ hw->pdata->set_cs(hw->pdata, value, cspol);
+ else
+ s3c2410_gpio_setpin(hw->pdata->pin_cs, cspol ^ 1);
+ break;
+
+ case BITBANG_CS_ACTIVE:
+ spcon = readb(hw->regs + S3C2410_SPCON);
+
+ if (spi->mode & SPI_CPHA)
+ spcon |= S3C2410_SPCON_CPHA_FMTB;
+ else
+ spcon &= ~S3C2410_SPCON_CPHA_FMTB;
+
+ if (spi->mode & SPI_CPOL)
+ spcon |= S3C2410_SPCON_CPOL_HIGH;
+ else
+ spcon &= ~S3C2410_SPCON_CPOL_HIGH;
+
+ spcon |= S3C2410_SPCON_ENSCK;
+
+ /* write new configration */
+
+ writeb(spcon, hw->regs + S3C2410_SPCON);
+
+ if (hw->pdata->set_cs)
+ hw->pdata->set_cs(hw->pdata, value, cspol);
+ else
+ s3c2410_gpio_setpin(hw->pdata->pin_cs, cspol);
+
+ break;
+
+ }
+}
+
+static int s3c24xx_spi_setupxfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ struct s3c24xx_spi *hw = to_hw(spi);
+ unsigned int bpw;
+ unsigned int hz;
+ unsigned int div;
+
+ bpw = t ? t->bits_per_word : spi->bits_per_word;
+ hz = t ? t->speed_hz : spi->max_speed_hz;
+
+ if (bpw != 8) {
+ dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw);
+ return -EINVAL;
+ }
+
+ div = clk_get_rate(hw->clk) / hz;
+
+ /* is clk = pclk / (2 * (pre+1)), or is it
+ * clk = (pclk * 2) / ( pre + 1) */
+
+ div = (div / 2) - 1;
+
+ if (div < 0)
+ div = 1;
+
+ if (div > 255)
+ div = 255;
+
+ dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", div, hz);
+ writeb(div, hw->regs + S3C2410_SPPRE);
+
+ spin_lock(&hw->bitbang.lock);
+ if (!hw->bitbang.busy) {
+ hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE);
+ /* need to ndelay for 0.5 clocktick ? */
+ }
+ spin_unlock(&hw->bitbang.lock);
+
+ return 0;
+}
+
+static int s3c24xx_spi_setup(struct spi_device *spi)
+{
+ int ret;
+
+ if (!spi->bits_per_word)
+ spi->bits_per_word = 8;
+
+ if ((spi->mode & SPI_LSB_FIRST) != 0)
+ return -EINVAL;
+
+ ret = s3c24xx_spi_setupxfer(spi, NULL);
+ if (ret < 0) {
+ dev_err(&spi->dev, "setupxfer returned %d\n", ret);
+ return ret;
+ }
+
+ dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n",
+ __FUNCTION__, spi->mode, spi->bits_per_word,
+ spi->max_speed_hz);
+
+ return 0;
+}
+
+static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count)
+{
+ return hw->tx ? hw->tx[count] : 0xff;
+}
+
+static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct s3c24xx_spi *hw = to_hw(spi);
+
+ dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n",
+ t->tx_buf, t->rx_buf, t->len);
+
+ hw->tx = t->tx_buf;
+ hw->rx = t->rx_buf;
+ hw->len = t->len;
+ hw->count = 0;
+
+ /* send the first byte */
+ writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT);
+ wait_for_completion(&hw->done);
+
+ return hw->count;
+}
+
+static irqreturn_t s3c24xx_spi_irq(int irq, void *dev, struct pt_regs *regs)
+{
+ struct s3c24xx_spi *hw = dev;
+ unsigned int spsta = readb(hw->regs + S3C2410_SPSTA);
+ unsigned int count = hw->count;
+
+ if (spsta & S3C2410_SPSTA_DCOL) {
+ dev_dbg(hw->dev, "data-collision\n");
+ complete(&hw->done);
+ goto irq_done;
+ }
+
+ if (!(spsta & S3C2410_SPSTA_READY)) {
+ dev_dbg(hw->dev, "spi not ready for tx?\n");
+ complete(&hw->done);
+ goto irq_done;
+ }
+
+ hw->count++;
+
+ if (hw->rx)
+ hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT);
+
+ count++;
+
+ if (count < hw->len)
+ writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT);
+ else
+ complete(&hw->done);
+
+ irq_done:
+ return IRQ_HANDLED;
+}
+
+static int s3c24xx_spi_probe(struct platform_device *pdev)
+{
+ struct s3c24xx_spi *hw;
+ struct spi_master *master;
+ struct spi_board_info *bi;
+ struct resource *res;
+ int err = 0;
+ int i;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi));
+ if (master == NULL) {
+ dev_err(&pdev->dev, "No memory for spi_master\n");
+ err = -ENOMEM;
+ goto err_nomem;
+ }
+
+ hw = spi_master_get_devdata(master);
+ memset(hw, 0, sizeof(struct s3c24xx_spi));
+
+ hw->master = spi_master_get(master);
+ hw->pdata = pdev->dev.platform_data;
+ hw->dev = &pdev->dev;
+
+ if (hw->pdata == NULL) {
+ dev_err(&pdev->dev, "No platform data supplied\n");
+ err = -ENOENT;
+ goto err_no_pdata;
+ }
+
+ platform_set_drvdata(pdev, hw);
+ init_completion(&hw->done);
+
+ /* setup the state for the bitbang driver */
+
+ hw->bitbang.master = hw->master;
+ hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer;
+ hw->bitbang.chipselect = s3c24xx_spi_chipsel;
+ hw->bitbang.txrx_bufs = s3c24xx_spi_txrx;
+ hw->bitbang.master->setup = s3c24xx_spi_setup;
+
+ dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
+
+ /* find and map our resources */
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
+ err = -ENOENT;
+ goto err_no_iores;
+ }
+
+ hw->ioarea = request_mem_region(res->start, (res->end - res->start)+1,
+ pdev->name);
+
+ if (hw->ioarea == NULL) {
+ dev_err(&pdev->dev, "Cannot reserve region\n");
+ err = -ENXIO;
+ goto err_no_iores;
+ }
+
+ hw->regs = ioremap(res->start, (res->end - res->start)+1);
+ if (hw->regs == NULL) {
+ dev_err(&pdev->dev, "Cannot map IO\n");
+ err = -ENXIO;
+ goto err_no_iomap;
+ }
+
+ hw->irq = platform_get_irq(pdev, 0);
+ if (hw->irq < 0) {
+ dev_err(&pdev->dev, "No IRQ specified\n");
+ err = -ENOENT;
+ goto err_no_irq;
+ }
+
+ err = request_irq(hw->irq, s3c24xx_spi_irq, 0, pdev->name, hw);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot claim IRQ\n");
+ goto err_no_irq;
+ }
+
+ hw->clk = clk_get(&pdev->dev, "spi");
+ if (IS_ERR(hw->clk)) {
+ dev_err(&pdev->dev, "No clock for device\n");
+ err = PTR_ERR(hw->clk);
+ goto err_no_clk;
+ }
+
+ /* for the moment, permanently enable the clock */
+
+ clk_enable(hw->clk);
+
+ /* program defaults into the registers */
+
+ writeb(0xff, hw->regs + S3C2410_SPPRE);
+ writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN);
+ writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON);
+
+ /* setup any gpio we can */
+
+ if (!hw->pdata->set_cs) {
+ s3c2410_gpio_setpin(hw->pdata->pin_cs, 1);
+ s3c2410_gpio_cfgpin(hw->pdata->pin_cs, S3C2410_GPIO_OUTPUT);
+ }
+
+ /* register our spi controller */
+
+ err = spi_bitbang_start(&hw->bitbang);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to register SPI master\n");
+ goto err_register;
+ }
+
+ dev_dbg(hw->dev, "shutdown=%d\n", hw->bitbang.shutdown);
+
+ /* register all the devices associated */
+
+ bi = &hw->pdata->board_info[0];
+ for (i = 0; i < hw->pdata->board_size; i++, bi++) {
+ dev_info(hw->dev, "registering %s\n", bi->modalias);
+
+ bi->controller_data = hw;
+ spi_new_device(master, bi);
+ }
+
+ return 0;
+
+ err_register:
+ clk_disable(hw->clk);
+ clk_put(hw->clk);
+
+ err_no_clk:
+ free_irq(hw->irq, hw);
+
+ err_no_irq:
+ iounmap(hw->regs);
+
+ err_no_iomap:
+ release_resource(hw->ioarea);
+ kfree(hw->ioarea);
+
+ err_no_iores:
+ err_no_pdata:
+ spi_master_put(hw->master);;
+
+ err_nomem:
+ return err;
+}
+
+static int s3c24xx_spi_remove(struct platform_device *dev)
+{
+ struct s3c24xx_spi *hw = platform_get_drvdata(dev);
+
+ platform_set_drvdata(dev, NULL);
+
+ spi_unregister_master(hw->master);
+
+ clk_disable(hw->clk);
+ clk_put(hw->clk);
+
+ free_irq(hw->irq, hw);
+ iounmap(hw->regs);
+
+ release_resource(hw->ioarea);
+ kfree(hw->ioarea);
+
+ spi_master_put(hw->master);
+ return 0;
+}
+
+
+#ifdef CONFIG_PM
+
+static int s3c24xx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+ struct s3c24xx_spi *hw = platform_get_drvdata(dev);
+
+ clk_disable(hw->clk);
+ return 0;
+}
+
+static int s3c24xx_spi_resume(struct platform_device *pdev)
+{
+ struct s3c24xx_spi *hw = platform_get_drvdata(dev);
+
+ clk_enable(hw->clk);
+ return 0;
+}
+
+#else
+#define s3c24xx_spi_suspend NULL
+#define s3c24xx_spi_resume NULL
+#endif
+
+static struct platform_driver s3c24xx_spidrv = {
+ .probe = s3c24xx_spi_probe,
+ .remove = s3c24xx_spi_remove,
+ .suspend = s3c24xx_spi_suspend,
+ .resume = s3c24xx_spi_resume,
+ .driver = {
+ .name = "s3c2410-spi",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init s3c24xx_spi_init(void)
+{
+ return platform_driver_register(&s3c24xx_spidrv);
+}
+
+static void __exit s3c24xx_spi_exit(void)
+{
+ platform_driver_unregister(&s3c24xx_spidrv);
+}
+
+module_init(s3c24xx_spi_init);
+module_exit(s3c24xx_spi_exit);
+
+MODULE_DESCRIPTION("S3C24XX SPI Driver");
+MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/spi/spi_s3c24xx_gpio.c b/drivers/spi/spi_s3c24xx_gpio.c
new file mode 100644
index 00000000000..aacdceb8f44
--- /dev/null
+++ b/drivers/spi/spi_s3c24xx_gpio.c
@@ -0,0 +1,188 @@
+/* linux/drivers/spi/spi_s3c24xx_gpio.c
+ *
+ * Copyright (c) 2006 Ben Dooks
+ * Copyright (c) 2006 Simtec Electronics
+ *
+ * S3C24XX GPIO based SPI driver
+ *
+ * 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/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/spi-gpio.h>
+#include <asm/arch/hardware.h>
+
+struct s3c2410_spigpio {
+ struct spi_bitbang bitbang;
+
+ struct s3c2410_spigpio_info *info;
+ struct platform_device *dev;
+};
+
+static inline struct s3c2410_spigpio *spidev_to_sg(struct spi_device *spi)
+{
+ return spi->controller_data;
+}
+
+static inline void setsck(struct spi_device *dev, int on)
+{
+ struct s3c2410_spigpio *sg = spidev_to_sg(dev);
+ s3c2410_gpio_setpin(sg->info->pin_clk, on ? 1 : 0);
+}
+
+static inline void setmosi(struct spi_device *dev, int on)
+{
+ struct s3c2410_spigpio *sg = spidev_to_sg(dev);
+ s3c2410_gpio_setpin(sg->info->pin_mosi, on ? 1 : 0);
+}
+
+static inline u32 getmiso(struct spi_device *dev)
+{
+ struct s3c2410_spigpio *sg = spidev_to_sg(dev);
+ return s3c2410_gpio_getpin(sg->info->pin_miso) ? 1 : 0;
+}
+
+#define spidelay(x) ndelay(x)
+
+#define EXPAND_BITBANG_TXRX
+#include <linux/spi/spi_bitbang.h>
+
+
+static u32 s3c2410_spigpio_txrx_mode0(struct spi_device *spi,
+ unsigned nsecs, u32 word, u8 bits)
+{
+ return bitbang_txrx_be_cpha0(spi, nsecs, 0, word, bits);
+}
+
+static u32 s3c2410_spigpio_txrx_mode1(struct spi_device *spi,
+ unsigned nsecs, u32 word, u8 bits)
+{
+ return bitbang_txrx_be_cpha1(spi, nsecs, 0, word, bits);
+}
+
+static void s3c2410_spigpio_chipselect(struct spi_device *dev, int value)
+{
+ struct s3c2410_spigpio *sg = spidev_to_sg(dev);
+
+ if (sg->info && sg->info->chip_select)
+ (sg->info->chip_select)(sg->info, value);
+}
+
+static int s3c2410_spigpio_probe(struct platform_device *dev)
+{
+ struct spi_master *master;
+ struct s3c2410_spigpio *sp;
+ int ret;
+ int i;
+
+ master = spi_alloc_master(&dev->dev, sizeof(struct s3c2410_spigpio));
+ if (master == NULL) {
+ dev_err(&dev->dev, "failed to allocate spi master\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ sp = spi_master_get_devdata(master);
+
+ platform_set_drvdata(dev, sp);
+
+ /* copy in the plkatform data */
+ sp->info = dev->dev.platform_data;
+
+ /* setup spi bitbang adaptor */
+ sp->bitbang.master = spi_master_get(master);
+ sp->bitbang.chipselect = s3c2410_spigpio_chipselect;
+
+ sp->bitbang.txrx_word[SPI_MODE_0] = s3c2410_spigpio_txrx_mode0;
+ sp->bitbang.txrx_word[SPI_MODE_1] = s3c2410_spigpio_txrx_mode1;
+
+ /* set state of spi pins */
+ s3c2410_gpio_setpin(sp->info->pin_clk, 0);
+ s3c2410_gpio_setpin(sp->info->pin_mosi, 0);
+
+ s3c2410_gpio_cfgpin(sp->info->pin_clk, S3C2410_GPIO_OUTPUT);
+ s3c2410_gpio_cfgpin(sp->info->pin_mosi, S3C2410_GPIO_OUTPUT);
+ s3c2410_gpio_cfgpin(sp->info->pin_miso, S3C2410_GPIO_INPUT);
+
+ ret = spi_bitbang_start(&sp->bitbang);
+ if (ret)
+ goto err_no_bitbang;
+
+ /* register the chips to go with the board */
+
+ for (i = 0; i < sp->info->board_size; i++) {
+ dev_info(&dev->dev, "registering %p: %s\n",
+ &sp->info->board_info[i],
+ sp->info->board_info[i].modalias);
+
+ sp->info->board_info[i].controller_data = sp;
+ spi_new_device(master, sp->info->board_info + i);
+ }
+
+ return 0;
+
+ err_no_bitbang:
+ spi_master_put(sp->bitbang.master);
+ err:
+ return ret;
+
+}
+
+static int s3c2410_spigpio_remove(struct platform_device *dev)
+{
+ struct s3c2410_spigpio *sp = platform_get_drvdata(dev);
+
+ spi_bitbang_stop(&sp->bitbang);
+ spi_master_put(sp->bitbang.master);
+
+ return 0;
+}
+
+/* all gpio should be held over suspend/resume, so we should
+ * not need to deal with this
+*/
+
+#define s3c2410_spigpio_suspend NULL
+#define s3c2410_spigpio_resume NULL
+
+
+static struct platform_driver s3c2410_spigpio_drv = {
+ .probe = s3c2410_spigpio_probe,
+ .remove = s3c2410_spigpio_remove,
+ .suspend = s3c2410_spigpio_suspend,
+ .resume = s3c2410_spigpio_resume,
+ .driver = {
+ .name = "s3c24xx-spi-gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init s3c2410_spigpio_init(void)
+{
+ return platform_driver_register(&s3c2410_spigpio_drv);
+}
+
+static void __exit s3c2410_spigpio_exit(void)
+{
+ platform_driver_unregister(&s3c2410_spigpio_drv);
+}
+
+module_init(s3c2410_spigpio_init);
+module_exit(s3c2410_spigpio_exit);
+
+MODULE_DESCRIPTION("S3C24XX SPI Driver");
+MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-02 05:26:04 +0000