diff options
Diffstat (limited to 'drivers/spi/pxa2xx_spi.c')
| -rw-r--r-- | drivers/spi/pxa2xx_spi.c | 1740 |
1 files changed, 0 insertions, 1740 deletions
diff --git a/drivers/spi/pxa2xx_spi.c b/drivers/spi/pxa2xx_spi.c deleted file mode 100644 index e76b1afafe0..00000000000 --- a/drivers/spi/pxa2xx_spi.c +++ /dev/null @@ -1,1740 +0,0 @@ -/* - * 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/delay.h> -#include <linux/clk.h> -#include <linux/gpio.h> -#include <linux/slab.h> - -#include <asm/io.h> -#include <asm/irq.h> -#include <asm/delay.h> - -#include <mach/dma.h> -#include <plat/ssp.h> -#include <mach/pxa2xx_spi.h> - -MODULE_AUTHOR("Stephen Street"); -MODULE_DESCRIPTION("PXA2xx SSP SPI Controller"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS("platform:pxa2xx-spi"); - -#define MAX_BUSES 3 - -#define RX_THRESH_DFLT 8 -#define TX_THRESH_DFLT 8 -#define TIMOUT_DFLT 1000 - -#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 MAX_DMA_LEN 8191 -#define DMA_ALIGNMENT 8 - -/* - * for testing SSCR1 changes that require SSP restart, basically - * everything except the service and interrupt enables, the pxa270 developer - * manual says only SSCR1_SCFR, SSCR1_SPH, SSCR1_SPO need to be in this - * list, but the PXA255 dev man says all bits without really meaning the - * service and interrupt enables - */ -#define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \ - | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \ - | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \ - | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \ - | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \ - | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM) - -#define DEFINE_SSP_REG(reg, off) \ -static inline u32 read_##reg(void const __iomem *p) \ -{ return __raw_readl(p + (off)); } \ -\ -static inline void write_##reg(u32 v, void __iomem *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; - - /* SSP Info */ - struct ssp_device *ssp; - - /* 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 __iomem *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 (*write)(struct driver_data *drv_data); - int (*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 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; - int gpio_cs; - int gpio_cs_inverted; - int (*write)(struct driver_data *drv_data); - int (*read)(struct driver_data *drv_data); - void (*cs_control)(u32 command); -}; - -static void pump_messages(struct work_struct *work); - -static void cs_assert(struct driver_data *drv_data) -{ - struct chip_data *chip = drv_data->cur_chip; - - if (chip->cs_control) { - chip->cs_control(PXA2XX_CS_ASSERT); - return; - } - - if (gpio_is_valid(chip->gpio_cs)) - gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted); -} - -static void cs_deassert(struct driver_data *drv_data) -{ - struct chip_data *chip = drv_data->cur_chip; - - if (chip->cs_control) { - chip->cs_control(PXA2XX_CS_DEASSERT); - return; - } - - if (gpio_is_valid(chip->gpio_cs)) - gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted); -} - -static int flush(struct driver_data *drv_data) -{ - unsigned long limit = loops_per_jiffy << 1; - - void __iomem *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 int null_writer(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - u8 n_bytes = drv_data->n_bytes; - - if (((read_SSSR(reg) & 0x00000f00) == 0x00000f00) - || (drv_data->tx == drv_data->tx_end)) - return 0; - - write_SSDR(0, reg); - drv_data->tx += n_bytes; - - return 1; -} - -static int null_reader(struct driver_data *drv_data) -{ - void __iomem *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; - } - - return drv_data->rx == drv_data->rx_end; -} - -static int u8_writer(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - - if (((read_SSSR(reg) & 0x00000f00) == 0x00000f00) - || (drv_data->tx == drv_data->tx_end)) - return 0; - - write_SSDR(*(u8 *)(drv_data->tx), reg); - ++drv_data->tx; - - return 1; -} - -static int u8_reader(struct driver_data *drv_data) -{ - void __iomem *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; - } - - return drv_data->rx == drv_data->rx_end; -} - -static int u16_writer(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - - if (((read_SSSR(reg) & 0x00000f00) == 0x00000f00) - || (drv_data->tx == drv_data->tx_end)) - return 0; - - write_SSDR(*(u16 *)(drv_data->tx), reg); - drv_data->tx += 2; - - return 1; -} - -static int u16_reader(struct driver_data *drv_data) -{ - void __iomem *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; - } - - return drv_data->rx == drv_data->rx_end; -} - -static int u32_writer(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - - if (((read_SSSR(reg) & 0x00000f00) == 0x00000f00) - || (drv_data->tx == drv_data->tx_end)) - return 0; - - write_SSDR(*(u32 *)(drv_data->tx), reg); - drv_data->tx += 4; - - return 1; -} - -static int u32_reader(struct driver_data *drv_data) -{ - void __iomem *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; - } - - return drv_data->rx == drv_data->rx_end; -} - -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 tx buffer. Always do DMA_TO_DEVICE first - * so we flush the cache *before* invalidating it, in case - * the tx and rx buffers overlap. - */ - drv_data->tx_dma = dma_map_single(dev, drv_data->tx, - drv_data->tx_map_len, DMA_TO_DEVICE); - if (dma_mapping_error(dev, drv_data->tx_dma)) - return 0; - - /* 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(dev, drv_data->rx_dma)) { - dma_unmap_single(dev, drv_data->tx_dma, - drv_data->tx_map_len, DMA_TO_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; - 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); - - /* Delay if requested before any change in chip select */ - if (last_transfer->delay_usecs) - udelay(last_transfer->delay_usecs); - - /* Drop chip select UNLESS cs_change is true or we are returning - * a message with an error, or next message is for another chip - */ - if (!last_transfer->cs_change) - cs_deassert(drv_data); - else { - struct spi_message *next_msg; - - /* Holding of cs was hinted, but we need to make sure - * the next message is for the same chip. Don't waste - * time with the following tests unless this was hinted. - * - * We cannot postpone this until pump_messages, because - * after calling msg->complete (below) the driver that - * sent the current message could be unloaded, which - * could invalidate the cs_control() callback... - */ - - /* get a pointer to the next message, if any */ - spin_lock_irqsave(&drv_data->lock, flags); - if (list_empty(&drv_data->queue)) - next_msg = NULL; - else - next_msg = list_entry(drv_data->queue.next, - struct spi_message, queue); - spin_unlock_irqrestore(&drv_data->lock, flags); - - /* see if the next and current messages point - * to the same chip - */ - if (next_msg && next_msg->spi != msg->spi) - next_msg = NULL; - if (!next_msg || msg->state == ERROR_STATE) - cs_deassert(drv_data); - } - - msg->state = NULL; - if (msg->complete) - msg->complete(msg->context); - - drv_data->cur_chip = NULL; -} - -static int wait_ssp_rx_stall(void const __iomem *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_error_stop(struct driver_data *drv_data, const char *msg) -{ - void __iomem *reg = drv_data->ioaddr; - - /* Stop and reset */ - DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL; - DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL; - write_SSSR(drv_data->clear_sr, reg); - write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg); - if (drv_data->ssp_type != PXA25x_SSP) - write_SSTO(0, reg); - flush(drv_data); - write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); - - unmap_dma_buffers(drv_data); - - dev_err(&drv_data->pdev->dev, "%s\n", msg); - - drv_data->cur_msg->state = ERROR_STATE; - tasklet_schedule(&drv_data->pump_transfers); -} - -static void dma_transfer_complete(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - struct spi_message *msg = drv_data->cur_msg; - - /* 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"); - - 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); - - /* update the buffer pointer for the amount completed in dma */ - drv_data->rx += drv_data->len - - (DCMD(drv_data->rx_channel) & DCMD_LENGTH); - - /* read trailing data from fifo, it does not matter how many - * bytes are in the fifo just read until buffer is full - * or fifo is empty, which ever occurs first */ - drv_data->read(drv_data); - - /* return count of what was actually read */ - msg->actual_length += drv_data->len - - (drv_data->rx_end - drv_data->rx); - - /* Transfer delays and chip select release are - * handled in pump_transfers or giveback - */ - - /* Move to next transfer */ - msg->state = next_transfer(drv_data); - - /* Schedule transfer tasklet */ - tasklet_schedule(&drv_data->pump_transfers); -} - -static void dma_handler(int channel, void *data) -{ - struct driver_data *drv_data = data; - u32 irq_status = DCSR(channel) & DMA_INT_MASK; - - if (irq_status & DCSR_BUSERR) { - - if (channel == drv_data->tx_channel) - dma_error_stop(drv_data, - "dma_handler: " - "bad bus address on tx channel"); - else - dma_error_stop(drv_data, - "dma_handler: " - "bad bus address on rx channel"); - return; - } - - /* PXA255x_SSP has no timeout interrupt, wait for tailing bytes */ - if ((channel == drv_data->tx_channel) - && (irq_status & DCSR_ENDINTR) - && (drv_data->ssp_type == PXA25x_SSP)) { - - /* 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"); - - /* finish this transfer, start the next */ - dma_transfer_complete(drv_data); - } -} - -static irqreturn_t dma_transfer(struct driver_data *drv_data) -{ - u32 irq_status; - void __iomem *reg = drv_data->ioaddr; - - irq_status = read_SSSR(reg) & drv_data->mask_sr; - if (irq_status & SSSR_ROR) { - dma_error_stop(drv_data, "dma_transfer: fifo overrun"); - 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 timeout interrupt, do the rest in - * dma_transfer_complete */ - if (drv_data->ssp_type != PXA25x_SSP) - write_SSTO(0, reg); - - /* finish this transfer, start the next */ - dma_transfer_complete(drv_data); - - return IRQ_HANDLED; - } - - /* Opps problem detected */ - return IRQ_NONE; -} - -static void int_error_stop(struct driver_data *drv_data, const char* msg) -{ - void __iomem *reg = drv_data->ioaddr; - - /* Stop and reset SSP */ - write_SSSR(drv_data->clear_sr, reg); - write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg); - if (drv_data->ssp_type != PXA25x_SSP) - write_SSTO(0, reg); - flush(drv_data); - write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); - - dev_err(&drv_data->pdev->dev, "%s\n", msg); - - drv_data->cur_msg->state = ERROR_STATE; - tasklet_schedule(&drv_data->pump_transfers); -} - -static void int_transfer_complete(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - - /* Stop SSP */ - write_SSSR(drv_data->clear_sr, reg); - write_SSCR1(read_SSCR1(reg) & ~drv_data->int_cr1, reg); - if (drv_data->ssp_type != PXA25x_SSP) - write_SSTO(0, reg); - - /* Update total byte transfered return count actual bytes read */ - drv_data->cur_msg->actual_length += drv_data->len - - (drv_data->rx_end - drv_data->rx); - - /* Transfer delays and chip select release are - * handled in pump_transfers or giveback - */ - - /* Move to next transfer */ - drv_data->cur_msg->state = next_transfer(drv_data); - - /* Schedule transfer tasklet */ - tasklet_schedule(&drv_data->pump_transfers); -} - -static irqreturn_t interrupt_transfer(struct driver_data *drv_data) -{ - void __iomem *reg = drv_data->ioaddr; - - u32 irq_mask = (read_SSCR1(reg) & SSCR1_TIE) ? - drv_data->mask_sr : drv_data->mask_sr & ~SSSR_TFS; - - u32 irq_status = read_SSSR(reg) & irq_mask; - - if (irq_status & SSSR_ROR) { - int_error_stop(drv_data, "interrupt_transfer: fifo overrun"); - return IRQ_HANDLED; - } - - if (irq_status & SSSR_TINT) { - write_SSSR(SSSR_TINT, reg); - if (drv_data->read(drv_data)) { - int_transfer_complete(drv_data); - return IRQ_HANDLED; - } - } - - /* Drain rx fifo, Fill tx fifo and prevent overruns */ - do { - if (drv_data->read(drv_data)) { - int_transfer_complete(drv_data); - return IRQ_HANDLED; - } - } while (drv_data->write(drv_data)); - - if (drv_data->read(drv_data)) { - int_transfer_complete(drv_data); - return IRQ_HANDLED; - } - - if (drv_data->tx == drv_data->tx_end) { - write_SSCR1(read_SSCR1(reg) & ~SSCR1_TIE, reg); - /* PXA25x_SSP has no timeout, read trailing bytes */ - if (drv_data->ssp_type == PXA25x_SSP) { - if (!wait_ssp_rx_stall(reg)) - { - int_error_stop(drv_data, "interrupt_transfer: " - "rx stall failed"); - return IRQ_HANDLED; - } - if (!drv_data->read(drv_data)) - { - int_error_stop(drv_data, - "interrupt_transfer: " - "trailing byte read failed"); - return IRQ_HANDLED; - } - int_transfer_complete(drv_data); - } - } - - /* We did something */ - return IRQ_HANDLED; -} - -static irqreturn_t ssp_int(int irq, void *dev_id) -{ - struct driver_data *drv_data = dev_id; - void __iomem *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\n"); - - /* Never fail */ - return IRQ_HANDLED; - } - - return drv_data->transfer_handler(drv_data); -} - -static int set_dma_burst_and_threshold(struct chip_data *chip, - struct spi_device *spi, - u8 bits_per_word, u32 *burst_code, - u32 *threshold) -{ - struct pxa2xx_spi_chip *chip_info = - (struct pxa2xx_spi_chip *)spi->controller_data; - int bytes_per_word; - int burst_bytes; - int thresh_words; - int req_burst_size; - int retval = 0; - - /* Set the threshold (in registers) to equal the same amount of data - * as represented by burst size (in bytes). The computation below - * is (burst_size rounded up to nearest 8 byte, word or long word) - * divided by (bytes/register); the tx threshold is the inverse of - * the rx, so that there will always be enough data in the rx fifo - * to satisfy a burst, and there will always be enough space in the - * tx fifo to accept a burst (a tx burst will overwrite the fifo if - * there is not enough space), there must always remain enough empty - * space in the rx fifo for any data loaded to the tx fifo. - * Whenever burst_size (in bytes) equals bits/word, the fifo threshold - * will be 8, or half the fifo; - * The threshold can only be set to 2, 4 or 8, but not 16, because - * to burst 16 to the tx fifo, the fifo would have to be empty; - * however, the minimum fifo trigger level is 1, and the tx will - * request service when the fifo is at this level, with only 15 spaces. - */ - - /* find bytes/word */ - if (bits_per_word <= 8) - bytes_per_word = 1; - else if (bits_per_word <= 16) - bytes_per_word = 2; - else - bytes_per_word = 4; - - /* use struct pxa2xx_spi_chip->dma_burst_size if available */ - if (chip_info) - req_burst_size = chip_info->dma_burst_size; - else { - switch (chip->dma_burst_size) { - default: - /* if the default burst size is not set, - * do it now */ - chip->dma_burst_size = DCMD_BURST8; - case DCMD_BURST8: - req_burst_size = 8; - break; - case DCMD_BURST16: - req_burst_size = 16; - break; - case DCMD_BURST32: - req_burst_size = 32; - break; - } - } - if (req_burst_size <= 8) { - *burst_code = DCMD_BURST8; - burst_bytes = 8; - } else if (req_burst_size <= 16) { - if (bytes_per_word == 1) { - /* don't burst more than 1/2 the fifo */ - *burst_code = DCMD_BURST8; - burst_bytes = 8; - retval = 1; - } else { - *burst_code = DCMD_BURST16; - burst_bytes = 16; - } - } else { - if (bytes_per_word == 1) { - /* don't burst more than 1/2 the fifo */ - *burst_code = DCMD_BURST8; - burst_bytes = 8; - retval = 1; - } else if (bytes_per_word == 2) { - /* don't burst more than 1/2 the fifo */ - *burst_code = DCMD_BURST16; - burst_bytes = 16; - retval = 1; - } else { - *burst_code = DCMD_BURST32; - burst_bytes = 32; - } - } - - thresh_words = burst_bytes / bytes_per_word; - - /* thresh_words will be between 2 and 8 */ - *threshold = (SSCR1_RxTresh(thresh_words) & SSCR1_RFT) - | (SSCR1_TxTresh(16-thresh_words) & SSCR1_TFT); - - return retval; -} - -static unsigned int ssp_get_clk_div(struct ssp_device *ssp, int rate) -{ - unsigned long ssp_clk = clk_get_rate(ssp->clk); - - if (ssp->type == PXA25x_SSP) - return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8; - else - return ((ssp_clk / rate - 1) & 0xfff) << 8; -} - -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; - struct ssp_device *ssp = drv_data->ssp; - void __iomem *reg = drv_data->ioaddr; - u32 clk_div = 0; - u8 bits = 0; - u32 speed = 0; - u32 cr0; - u32 cr1; - u32 dma_thresh = drv_data->cur_chip->dma_threshold; - u32 dma_burst = drv_data->cur_chip->dma_burst_size; - - /* 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 before CS change */ - 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); - - /* Drop chip select only if cs_change is requested */ - if (previous->cs_change) - cs_deassert(drv_data); - } - - /* Check for transfers that need multiple DMA segments */ - if (transfer->len > MAX_DMA_LEN && chip->enable_dma) { - - /* reject already-mapped transfers; PIO won't always work */ - if (message->is_dma_mapped - || transfer->rx_dma || transfer->tx_dma) { - dev_err(&drv_data->pdev->dev, - "pump_transfers: mapped transfer length " - "of %u is greater than %d\n", - transfer->len, MAX_DMA_LEN); - message->status = -EINVAL; - giveback(drv_data); - return; - } - - /* warn ... we force this to PIO mode */ - if (printk_ratelimit()) - dev_warn(&message->spi->dev, "pump_transfers: " - "DMA disabled for transfer length %ld " - "greater than %d\n", - (long)drv_data->len, MAX_DMA_LEN); - } - - /* 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->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 & DCMD_LENGTH; - drv_data->write = drv_data->tx ? chip->write : null_writer; - drv_data->read = drv_data->rx ? chip->read : null_reader; - - /* Change speed and bit per word on a per transfer */ - cr0 = chip->cr0; - if (transfer->speed_hz || transfer->bits_per_word) { - - 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; - - clk_div = ssp_get_clk_div(ssp, 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; - } - /* if bits/word is changed in dma mode, then must check the - * thresholds and burst also */ - if (chip->enable_dma) { - if (set_dma_burst_and_threshold(chip, message->spi, - bits, &dma_burst, - &dma_thresh)) - if (printk_ratelimit()) - dev_warn(&message->spi->dev, - "pump_transfers: " - "DMA burst size reduced to " - "match bits_per_word\n"); - } - - cr0 = clk_div - | SSCR0_Motorola - | SSCR0_DataSize(bits > 16 ? bits - 16 : bits) - | SSCR0_SSE - | (bits > 16 ? SSCR0_EDSS : 0); - } - - message->state = RUNNING_STATE; - - /* Try to map dma buffer and do a dma transfer if successful, but - * only if the length is non-zero and less than MAX_DMA_LEN. - * - * Zero-length non-descriptor DMA is illegal on PXA2xx; force use - * of PIO instead. Care is needed above because the transfer may - * have have been passed with buffers that are already dma mapped. - * A zero-length transfer in PIO mode will not try to write/read - * to/from the buffers - * - * REVISIT large transfers are exactly where we most want to be - * using DMA. If this happens much, split those transfers into - * multiple DMA segments rather than forcing PIO. - */ - drv_data->dma_mapped = 0; - if (drv_data->len > 0 && drv_data->len <= MAX_DMA_LEN) - drv_data->dma_mapped = map_dma_buffers(drv_data); - if (drv_data->dma_mapped) { - - /* 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 - | dma_burst - | drv_data->len; - else - DCMD(drv_data->rx_channel) = DCMD_INCTRGADDR - | DCMD_FLOWSRC - | drv_data->dma_width - | dma_burst - | 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 - | dma_burst - | drv_data->len; - else - DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR - | DCMD_FLOWTRG - | drv_data->dma_width - | dma_burst - | 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; - - /* Clear status and start DMA engine */ - cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1; - write_SSSR(drv_data->clear_sr, reg); - DCSR(drv_data->rx_channel) |= DCSR_RUN; - DCSR(drv_data->tx_channel) |= DCSR_RUN; - } else { - /* Ensure we have the correct interrupt handler */ - drv_data->transfer_handler = interrupt_transfer; - - /* Clear status */ - cr1 = chip->cr1 | chip->threshold | drv_data->int_cr1; - write_SSSR(drv_data->clear_sr, reg); - } - - /* see if we need to reload the config registers */ - if ((read_SSCR0(reg) != cr0) - || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) != - (cr1 & SSCR1_CHANGE_MASK)) { - - /* stop the SSP, and update the other bits */ - write_SSCR0(cr0 & ~SSCR0_SSE, reg); - if (drv_data->ssp_type != PXA25x_SSP) - write_SSTO(chip->timeout, reg); - /* first set CR1 without interrupt and service enables */ - write_SSCR1(cr1 & SSCR1_CHANGE_MASK, reg); - /* restart the SSP */ - write_SSCR0(cr0, reg); - - } else { - if (drv_data->ssp_type != PXA25x_SSP) - write_SSTO(chip->timeout, reg); - } - - cs_assert(drv_data); - - /* after chip select, release the data by enabling service - * requests and interrupts, without changing any mode bits */ - write_SSCR1(cr1, reg); -} - -static void pump_messages(struct work_struct *work) -{ - struct driver_data *drv_data = - container_of(work, struct driver_data, pump_messages); - 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); - - /* prepare to setup the SSP, in pump_transfers, using the per - * chip configuration */ - drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi); - - /* 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_cs(struct spi_device *spi, struct chip_data *chip, - struct pxa2xx_spi_chip *chip_info) -{ - int err = 0; - - if (chip == NULL || chip_info == NULL) - return 0; - - /* NOTE: setup() can be called multiple times, possibly with - * different chip_info, release previously requested GPIO - */ - if (gpio_is_valid(chip->gpio_cs)) - gpio_free(chip->gpio_cs); - - /* If (*cs_control) is provided, ignore GPIO chip select */ - if (chip_info->cs_control) { - chip->cs_control = chip_info->cs_control; - return 0; - } - - if (gpio_is_valid(chip_info->gpio_cs)) { - err = gpio_request(chip_info->gpio_cs, "SPI_CS"); - if (err) { - dev_err(&spi->dev, "failed to request chip select " - "GPIO%d\n", chip_info->gpio_cs); - return err; - } - - chip->gpio_cs = chip_info->gpio_cs; - chip->gpio_cs_inverted = spi->mode & SPI_CS_HIGH; - - err = gpio_direction_output(chip->gpio_cs, - !chip->gpio_cs_inverted); - } - - return err; -} - -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); - struct ssp_device *ssp = drv_data->ssp; - unsigned int clk_div; - uint tx_thres = TX_THRESH_DFLT; - uint rx_thres = RX_THRESH_DFLT; - - if (drv_data->ssp_type != PXA25x_SSP - && (spi->bits_per_word < 4 || spi->bits_per_word > 32)) { - dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d " - "b/w not 4-32 for type non-PXA25x_SSP\n", - drv_data->ssp_type, spi->bits_per_word); - return -EINVAL; - } - else if (drv_data->ssp_type == PXA25x_SSP - && (spi->bits_per_word < 4 - || spi->bits_per_word > 16)) { - dev_err(&spi->dev, "failed setup: ssp_type=%d, bits/wrd=%d " - "b/w not 4-16 for type PXA25x_SSP\n", - drv_data->ssp_type, spi->bits_per_word); - return -EINVAL; - } - - /* Only alloc on first setup */ - chip = spi_get_ctldata(spi); - if (!chip) { - chip = kzalloc(sizeof(struct chip_data), GFP_KERNEL); - if (!chip) { - dev_err(&spi->dev, - "failed setup: can't allocate chip data\n"); - return -ENOMEM; - } - - chip->gpio_cs = -1; - chip->enable_dma = 0; - chip->timeout = TIMOUT_DFLT; - chip->dma_burst_size = drv_data->master_info->enable_dma ? - DCMD_BURST8 : 0; - } - - /* protocol drivers may change the chip settings, so... - * if chip_info exists, use it */ - chip_info = spi->controller_data; - - /* chip_info isn't always needed */ - chip->cr1 = 0; - if (chip_info) { - if (chip_info->timeout) - chip->timeout = chip_info->timeout; - if (chip_info->tx_threshold) - tx_thres = chip_info->tx_threshold; - if (chip_info->rx_threshold) - rx_thres = chip_info->rx_threshold; - chip->enable_dma = drv_data->master_info->enable_dma; - chip->dma_threshold = 0; - if (chip_info->enable_loopback) - chip->cr1 = SSCR1_LBM; - } - - chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) | - (SSCR1_TxTresh(tx_thres) & SSCR1_TFT); - - /* set dma burst and threshold outside of chip_info path so that if - * chip_info goes away after setting chip->enable_dma, the - * burst and threshold can still respond to changes in bits_per_word */ - if (chip->enable_dma) { - /* set up legal burst and threshold for dma */ - if (set_dma_burst_and_threshold(chip, spi, spi->bits_per_word, - &chip->dma_burst_size, - &chip->dma_threshold)) { - dev_warn(&spi->dev, "in setup: DMA burst size reduced " - "to match bits_per_word\n"); - } - } - - clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz); - 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 &= ~(SSCR1_SPO | SSCR1_SPH); - chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0) - | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0); - - /* NOTE: PXA25x_SSP _could_ use external clocking ... */ - if (drv_data->ssp_type != PXA25x_SSP) - dev_dbg(&spi->dev, "%ld Hz actual, %s\n", - clk_get_rate(ssp->clk) - / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)), - chip->enable_dma ? "DMA" : "PIO"); - else - dev_dbg(&spi->dev, "%ld Hz actual, %s\n", - clk_get_rate(ssp->clk) / 2 - / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)), - chip->enable_dma ? "DMA" : "PIO"); - - 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"); - return -ENODEV; - } - chip->bits_per_word = spi->bits_per_word; - - spi_set_ctldata(spi, chip); - - return setup_cs(spi, chip, chip_info); -} - -static void cleanup(struct spi_device *spi) -{ - struct chip_data *chip = spi_get_ctldata(spi); - - if (!chip) - return; - - if (gpio_is_valid(chip->gpio_cs)) - gpio_free(chip->gpio_cs); - - kfree(chip); -} - -static int __init 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->workqueue = create_singlethread_workqueue( - dev_name(drv_data->master->dev.parent)); - 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); - /* we are unloading the module or failing to load (only two calls - * to this routine), and neither call can handle a return value. - * However, destroy_workqueue calls flush_workqueue, and that will - * block until all work is done. If the reason that stop_queue - * timed out is that the work will never finish, then it does no - * good to call destroy_workqueue, so return anyway. */ - if (status != 0) - return status; - - destroy_workqueue(drv_data->workqueue); - - return 0; -} - -static int __init 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; - struct ssp_device *ssp; - int status; - - platform_info = dev->platform_data; - - ssp = pxa_ssp_request(pdev->id, pdev->name); - if (ssp == NULL) { - dev_err(&pdev->dev, "failed to request SSP%d\n", pdev->id); - 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, "cannot alloc spi_master\n"); - pxa_ssp_free(ssp); - return -ENOMEM; - } - drv_data = spi_master_get_devdata(master); - drv_data->master = master; - drv_data->master_info = platform_info; - drv_data->pdev = pdev; - drv_data->ssp = ssp; - - /* the spi->mode bits understood by this driver: */ - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - - master->bus_num = pdev->id; - master->num_chipselect = platform_info->num_chipselect; - master->dma_alignment = DMA_ALIGNMENT; - master->cleanup = cleanup; - master->setup = setup; - master->transfer = transfer; - - drv_data->ssp_type = ssp->type; - drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data + - sizeof(struct driver_data)), 8); - - drv_data->ioaddr = ssp->mmio_base; - drv_data->ssdr_physical = ssp->phys_base + SSDR; - if (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; - } - - status = request_irq(ssp->irq, ssp_int, 0, dev_name(dev), drv_data); - if (status < 0) { - dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq); - 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; - } - - DRCMR(ssp->drcmr_rx) = DRCMR_MAPVLD | drv_data->rx_channel; - DRCMR(ssp->drcmr_tx) = DRCMR_MAPVLD | drv_data->tx_channel; - } - - /* Enable SOC clock */ - clk_enable(ssp->clk); - - /* Load default SSP configuration */ - write_SSCR0(0, drv_data->ioaddr); - write_SSCR1(SSCR1_RxTresh(RX_THRESH_DFLT) | - SSCR1_TxTresh(TX_THRESH_DFLT), - drv_data->ioaddr); - write_SSCR0(SSCR0_SCR(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: - clk_disable(ssp->clk); - -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(ssp->irq, drv_data); - -out_error_master_alloc: - spi_master_put(master); - pxa_ssp_free(ssp); - return status; -} - -static int pxa2xx_spi_remove(struct platform_device *pdev) -{ - struct driver_data *drv_data = platform_get_drvdata(pdev); - struct ssp_device *ssp; - int status = 0; - - if (!drv_data) - return 0; - ssp = drv_data->ssp; - - /* Remove the queue */ - status = destroy_queue(drv_data); - if (status != 0) - /* the kernel does not check the return status of this - * this routine (mod->exit, within the kernel). Therefore - * nothing is gained by returning from here, the module is - * going away regardless, and we should not leave any more - * resources allocated than necessary. We cannot free the - * message memory in drv_data->queue, but we can release the - * resources below. I think the kernel should honor -EBUSY - * returns but... */ - dev_err(&pdev->dev, "pxa2xx_spi_remove: workqueue will not " - "complete, message memory not freed\n"); - - /* Disable the SSP at the peripheral and SOC level */ - write_SSCR0(0, drv_data->ioaddr); - clk_disable(ssp->clk); - - /* Release DMA */ - if (drv_data->master_info->enable_dma) { - DRCMR(ssp->drcmr_rx) = 0; - DRCMR(ssp->drcmr_tx) = 0; - pxa_free_dma(drv_data->tx_channel); - pxa_free_dma(drv_data->rx_channel); - } - - /* Release IRQ */ - free_irq(ssp->irq, drv_data); - - /* Release SSP */ - pxa_ssp_free(ssp); - - /* 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 pxa2xx_spi_suspend(struct device *dev) -{ - struct driver_data *drv_data = dev_get_drvdata(dev); - struct ssp_device *ssp = drv_data->ssp; - int status = 0; - - status = stop_queue(drv_data); - if (status != 0) - return status; - write_SSCR0(0, drv_data->ioaddr); - clk_disable(ssp->clk); - - return 0; -} - -static int pxa2xx_spi_resume(struct device *dev) -{ - struct driver_data *drv_data = dev_get_drvdata(dev); - struct ssp_device *ssp = drv_data->ssp; - int status = 0; - - if (drv_data->rx_channel != -1) - DRCMR(drv_data->ssp->drcmr_rx) = - DRCMR_MAPVLD | drv_data->rx_channel; - if (drv_data->tx_channel != -1) - DRCMR(drv_data->ssp->drcmr_tx) = - DRCMR_MAPVLD | drv_data->tx_channel; - - /* Enable the SSP clock */ - clk_enable(ssp->clk); - - /* Start the queue running */ - status = start_queue(drv_data); - if (status != 0) { - dev_err(dev, "problem starting queue (%d)\n", status); - return status; - } - - return 0; -} - -static const struct dev_pm_ops pxa2xx_spi_pm_ops = { - .suspend = pxa2xx_spi_suspend, - .resume = pxa2xx_spi_resume, -}; -#endif - -static struct platform_driver driver = { - .driver = { - .name = "pxa2xx-spi", - .owner = THIS_MODULE, -#ifdef CONFIG_PM - .pm = &pxa2xx_spi_pm_ops, -#endif - }, - .remove = pxa2xx_spi_remove, - .shutdown = pxa2xx_spi_shutdown, -}; - -static int __init pxa2xx_spi_init(void) -{ - return platform_driver_probe(&driver, pxa2xx_spi_probe); -} -subsys_initcall(pxa2xx_spi_init); - -static void __exit pxa2xx_spi_exit(void) -{ - platform_driver_unregister(&driver); -} -module_exit(pxa2xx_spi_exit); |