diff options
Diffstat (limited to 'drivers/spi/spi-pxa2xx.c')
| -rw-r--r-- | drivers/spi/spi-pxa2xx.c | 1103 |
1 files changed, 342 insertions, 761 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 5c8c4f5883c4..90b27a3508a6 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -1,5 +1,6 @@ /* * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs + * Copyright (C) 2013, Intel Corporation * * 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 @@ -24,17 +25,20 @@ #include <linux/interrupt.h> #include <linux/platform_device.h> #include <linux/spi/pxa2xx_spi.h> -#include <linux/dma-mapping.h> #include <linux/spi/spi.h> #include <linux/workqueue.h> #include <linux/delay.h> #include <linux/gpio.h> #include <linux/slab.h> +#include <linux/clk.h> +#include <linux/pm_runtime.h> +#include <linux/acpi.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/delay.h> +#include "spi-pxa2xx.h" MODULE_AUTHOR("Stephen Street"); MODULE_DESCRIPTION("PXA2xx SSP SPI Controller"); @@ -45,12 +49,6 @@ MODULE_ALIAS("platform:pxa2xx-spi"); #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 @@ -65,115 +63,97 @@ MODULE_ALIAS("platform:pxa2xx-spi"); | 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; +#define LPSS_RX_THRESH_DFLT 64 +#define LPSS_TX_LOTHRESH_DFLT 160 +#define LPSS_TX_HITHRESH_DFLT 224 - /* SPI framework hookup */ - enum pxa_ssp_type ssp_type; - struct spi_master *master; +/* Offset from drv_data->lpss_base */ +#define SPI_CS_CONTROL 0x18 +#define SPI_CS_CONTROL_SW_MODE BIT(0) +#define SPI_CS_CONTROL_CS_HIGH BIT(1) - /* 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); -}; +static bool is_lpss_ssp(const struct driver_data *drv_data) +{ + return drv_data->ssp_type == LPSS_SSP; +} -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; - union { - int gpio_cs; - unsigned int frm; - }; - int gpio_cs_inverted; - int (*write)(struct driver_data *drv_data); - int (*read)(struct driver_data *drv_data); - void (*cs_control)(u32 command); -}; +/* + * Read and write LPSS SSP private registers. Caller must first check that + * is_lpss_ssp() returns true before these can be called. + */ +static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned offset) +{ + WARN_ON(!drv_data->lpss_base); + return readl(drv_data->lpss_base + offset); +} -static void pump_messages(struct work_struct *work); +static void __lpss_ssp_write_priv(struct driver_data *drv_data, + unsigned offset, u32 value) +{ + WARN_ON(!drv_data->lpss_base); + writel(value, drv_data->lpss_base + offset); +} + +/* + * lpss_ssp_setup - perform LPSS SSP specific setup + * @drv_data: pointer to the driver private data + * + * Perform LPSS SSP specific setup. This function must be called first if + * one is going to use LPSS SSP private registers. + */ +static void lpss_ssp_setup(struct driver_data *drv_data) +{ + unsigned offset = 0x400; + u32 value, orig; + + if (!is_lpss_ssp(drv_data)) + return; + + /* + * Perform auto-detection of the LPSS SSP private registers. They + * can be either at 1k or 2k offset from the base address. + */ + orig = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); + + value = orig | SPI_CS_CONTROL_SW_MODE; + writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL); + value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); + if (value != (orig | SPI_CS_CONTROL_SW_MODE)) { + offset = 0x800; + goto detection_done; + } + + value &= ~SPI_CS_CONTROL_SW_MODE; + writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL); + value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL); + if (value != orig) { + offset = 0x800; + goto detection_done; + } + +detection_done: + /* Now set the LPSS base */ + drv_data->lpss_base = drv_data->ioaddr + offset; + + /* Enable software chip select control */ + value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH; + __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); +} + +static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable) +{ + u32 value; + + if (!is_lpss_ssp(drv_data)) + return; + + value = __lpss_ssp_read_priv(drv_data, SPI_CS_CONTROL); + if (enable) + value &= ~SPI_CS_CONTROL_CS_HIGH; + else + value |= SPI_CS_CONTROL_CS_HIGH; + __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value); +} static void cs_assert(struct driver_data *drv_data) { @@ -189,8 +169,12 @@ static void cs_assert(struct driver_data *drv_data) return; } - if (gpio_is_valid(chip->gpio_cs)) + if (gpio_is_valid(chip->gpio_cs)) { gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted); + return; + } + + lpss_ssp_cs_control(drv_data, true); } static void cs_deassert(struct driver_data *drv_data) @@ -205,30 +189,15 @@ static void cs_deassert(struct driver_data *drv_data) return; } - if (gpio_is_valid(chip->gpio_cs)) + if (gpio_is_valid(chip->gpio_cs)) { gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted); -} - -static void write_SSSR_CS(struct driver_data *drv_data, u32 val) -{ - void __iomem *reg = drv_data->ioaddr; - - if (drv_data->ssp_type == CE4100_SSP) - val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK; - - write_SSSR(val, reg); -} + return; + } -static int pxa25x_ssp_comp(struct driver_data *drv_data) -{ - if (drv_data->ssp_type == PXA25x_SSP) - return 1; - if (drv_data->ssp_type == CE4100_SSP) - return 1; - return 0; + lpss_ssp_cs_control(drv_data, false); } -static int flush(struct driver_data *drv_data) +int pxa2xx_spi_flush(struct driver_data *drv_data) { unsigned long limit = loops_per_jiffy << 1; @@ -354,7 +323,7 @@ static int u32_reader(struct driver_data *drv_data) return drv_data->rx == drv_data->rx_end; } -static void *next_transfer(struct driver_data *drv_data) +void *pxa2xx_spi_next_transfer(struct driver_data *drv_data) { struct spi_message *msg = drv_data->cur_msg; struct spi_transfer *trans = drv_data->cur_transfer; @@ -370,89 +339,15 @@ static void *next_transfer(struct driver_data *drv_data) 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, @@ -481,13 +376,7 @@ static void giveback(struct driver_data *drv_data) */ /* 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); + next_msg = spi_get_next_queued_message(drv_data->master); /* see if the next and current messages point * to the same chip @@ -498,168 +387,10 @@ static void giveback(struct driver_data *drv_data) cs_deassert(drv_data); } - msg->state = NULL; - if (msg->complete) - msg->complete(msg->context); - + spi_finalize_current_message(drv_data->master); 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_CS(drv_data, drv_data->clear_sr); - write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg); - if (!pxa25x_ssp_comp(drv_data)) - 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_CS(drv_data, drv_data->clear_sr); - 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 (!pxa25x_ssp_comp(drv_data)) - 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 reset_sccr1(struct driver_data *drv_data) { void __iomem *reg = drv_data->ioaddr; @@ -681,7 +412,7 @@ static void int_error_stop(struct driver_data *drv_data, const char* msg) reset_sccr1(drv_data); if (!pxa25x_ssp_comp(drv_data)) write_SSTO(0, reg); - flush(drv_data); + pxa2xx_spi_flush(drv_data); write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg); dev_err(&drv_data->pdev->dev, "%s\n", msg); @@ -709,7 +440,7 @@ static void int_transfer_complete(struct driver_data *drv_data) */ /* Move to next transfer */ - drv_data->cur_msg->state = next_transfer(drv_data); + drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data); /* Schedule transfer tasklet */ tasklet_schedule(&drv_data->pump_transfers); @@ -789,10 +520,20 @@ static irqreturn_t ssp_int(int irq, void *dev_id) { struct driver_data *drv_data = dev_id; void __iomem *reg = drv_data->ioaddr; - u32 sccr1_reg = read_SSCR1(reg); + u32 sccr1_reg; u32 mask = drv_data->mask_sr; u32 status; + /* + * The IRQ might be shared with other peripherals so we must first + * check that are we RPM suspended or not. If we are we assume that + * the IRQ was not for us (we shouldn't be RPM suspended when the + * interrupt is enabled). + */ + if (pm_runtime_suspended(&drv_data->pdev->dev)) + return IRQ_NONE; + + sccr1_reg = read_SSCR1(reg); status = read_SSSR(reg); /* Ignore possible writes if we don't need to write */ @@ -820,106 +561,12 @@ static irqreturn_t ssp_int(int irq, void *dev_id) 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) +static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate) { - 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. - */ + unsigned long ssp_clk = drv_data->max_clk_rate; + const struct ssp_device *ssp = drv_data->ssp; - /* 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); + rate = min_t(int, ssp_clk, rate); if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP) return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8; @@ -934,7 +581,6 @@ static void pump_transfers(unsigned long data) 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; @@ -976,8 +622,8 @@ static void pump_transfers(unsigned long data) cs_deassert(drv_data); } - /* Check for transfers that need multiple DMA segments */ - if (transfer->len > MAX_DMA_LEN && chip->enable_dma) { + /* Check if we can DMA this transfer */ + if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) { /* reject already-mapped transfers; PIO won't always work */ if (message->is_dma_mapped @@ -1000,21 +646,20 @@ static void pump_transfers(unsigned long data) } /* Setup the transfer state based on the type of transfer */ - if (flush(drv_data) == 0) { + if (pxa2xx_spi_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->len = transfer->len; drv_data->write = drv_data->tx ? chip->write : null_writer; drv_data->read = drv_data->rx ? chip->read : null_reader; @@ -1031,25 +676,22 @@ static void pump_transfers(unsigned long data) if (transfer->bits_per_word) bits = transfer->bits_per_word; - clk_div = ssp_get_clk_div(ssp, speed); + clk_div = ssp_get_clk_div(drv_data, 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 ? @@ -1058,7 +700,8 @@ static void pump_transfers(unsigned long data) /* 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, + if (pxa2xx_spi_set_dma_burst_and_threshold(chip, + message->spi, bits, &dma_burst, &dma_thresh)) if (printk_ratelimit()) @@ -1077,70 +720,21 @@ static void pump_transfers(unsigned long data) 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 (pxa2xx_spi_dma_is_possible(drv_data->len)) + drv_data->dma_mapped = pxa2xx_spi_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; + drv_data->transfer_handler = pxa2xx_spi_dma_transfer; + + pxa2xx_spi_dma_prepare(drv_data, dma_burst); /* 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; + + pxa2xx_spi_dma_start(drv_data); } else { /* Ensure we have the correct interrupt handler */ drv_data->transfer_handler = interrupt_transfer; @@ -1150,6 +744,13 @@ static void pump_transfers(unsigned long data) write_SSSR_CS(drv_data, drv_data->clear_sr); } + if (is_lpss_ssp(drv_data)) { + if ((read_SSIRF(reg) & 0xff) != chip->lpss_rx_threshold) + write_SSIRF(chip->lpss_rx_threshold, reg); + if ((read_SSITF(reg) & 0xffff) != chip->lpss_tx_threshold) + write_SSITF(chip->lpss_tx_threshold, reg); + } + /* see if we need to reload the config registers */ if ((read_SSCR0(reg) != cr0) || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) != @@ -1176,31 +777,12 @@ static void pump_transfers(unsigned long data) write_SSCR1(cr1, reg); } -static void pump_messages(struct work_struct *work) +static int pxa2xx_spi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) { - 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); + struct driver_data *drv_data = spi_master_get_devdata(master); + drv_data->cur_msg = msg; /* Initial message state*/ drv_data->cur_msg->state = START_STATE; drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next, @@ -1213,34 +795,27 @@ static void pump_messages(struct work_struct *work) /* Mark as busy and launch transfers */ tasklet_schedule(&drv_data->pump_transfers); - - drv_data->busy = 1; - spin_unlock_irqrestore(&drv_data->lock, flags); + return 0; } -static int transfer(struct spi_device *spi, struct spi_message *msg) +static int pxa2xx_spi_prepare_transfer(struct spi_master *master) { - 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; + struct driver_data *drv_data = spi_master_get_devdata(master); - list_add_tail(&msg->queue, &drv_data->queue); + pm_runtime_get_sync(&drv_data->pdev->dev); + return 0; +} - if (drv_data->run == QUEUE_RUNNING && !drv_data->busy) - queue_work(drv_data->workqueue, &drv_data->pump_messages); +static int pxa2xx_spi_unprepare_transfer(struct spi_master *master) +{ + struct driver_data *drv_data = spi_master_get_devdata(master); - spin_unlock_irqrestore(&drv_data->lock, flags); + /* Disable the SSP now */ + write_SSCR0(read_SSCR0(drv_data->ioaddr) & ~SSCR0_SSE, + drv_data->ioaddr); + pm_runtime_mark_last_busy(&drv_data->pdev->dev); + pm_runtime_put_autosuspend(&drv_data->pdev->dev); return 0; } @@ -1287,10 +862,18 @@ 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; + uint tx_thres, tx_hi_thres, rx_thres; + + if (is_lpss_ssp(drv_data)) { + tx_thres = LPSS_TX_LOTHRESH_DFLT; + tx_hi_thres = LPSS_TX_HITHRESH_DFLT; + rx_thres = LPSS_RX_THRESH_DFLT; + } else { + tx_thres = TX_THRESH_DFLT; + tx_hi_thres = 0; + rx_thres = RX_THRESH_DFLT; + } if (!pxa25x_ssp_comp(drv_data) && (spi->bits_per_word < 4 || spi->bits_per_word > 32)) { @@ -1330,8 +913,6 @@ static int setup(struct spi_device *spi) 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... @@ -1345,23 +926,37 @@ static int setup(struct spi_device *spi) chip->timeout = chip_info->timeout; if (chip_info->tx_threshold) tx_thres = chip_info->tx_threshold; + if (chip_info->tx_hi_threshold) + tx_hi_thres = chip_info->tx_hi_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; + } else if (ACPI_HANDLE(&spi->dev)) { + /* + * Slave devices enumerated from ACPI namespace don't + * usually have chip_info but we still might want to use + * DMA with them. + */ + chip->enable_dma = drv_data->master_info->enable_dma; } chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) | (SSCR1_TxTresh(tx_thres) & SSCR1_TFT); + chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres); + chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres) + | SSITF_TxHiThresh(tx_hi_thres); + /* 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, + if (pxa2xx_spi_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 " @@ -1369,7 +964,7 @@ static int setup(struct spi_device *spi) } } - clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz); + clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz); chip->speed_hz = spi->max_speed_hz; chip->cr0 = clk_div @@ -1382,32 +977,32 @@ static int setup(struct spi_device *spi) chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0) | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0); + if (spi->mode & SPI_LOOP) + chip->cr1 |= SSCR1_LBM; + /* NOTE: PXA25x_SSP _could_ use external clocking ... */ if (!pxa25x_ssp_comp(drv_data)) dev_dbg(&spi->dev, "%ld Hz actual, %s\n", - clk_get_rate(ssp->clk) + drv_data->max_clk_rate / (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 + drv_data->max_clk_rate / 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 { @@ -1438,93 +1033,98 @@ static void cleanup(struct spi_device *spi) kfree(chip); } -static int init_queue(struct driver_data *drv_data) +#ifdef CONFIG_ACPI +static int pxa2xx_spi_acpi_add_dma(struct acpi_resource *res, void *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; + struct pxa2xx_spi_master *pdata = data; + + if (res->type == ACPI_RESOURCE_TYPE_FIXED_DMA) { + const struct acpi_resource_fixed_dma *dma; + + dma = &res->data.fixed_dma; + if (pdata->tx_slave_id < 0) { + pdata->tx_slave_id = dma->request_lines; + pdata->tx_chan_id = dma->channels; + } else if (pdata->rx_slave_id < 0) { + pdata->rx_slave_id = dma->request_lines; + pdata->rx_chan_id = dma->channels; + } + } - return 0; + /* Tell the ACPI core to skip this resource */ + return 1; } -static int start_queue(struct driver_data *drv_data) +static struct pxa2xx_spi_master * +pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev) { - 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; + struct pxa2xx_spi_master *pdata; + struct list_head resource_list; + struct acpi_device *adev; + struct ssp_device *ssp; + struct resource *res; + int devid; + + if (!ACPI_HANDLE(&pdev->dev) || + acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev)) + return NULL; + + pdata = devm_kzalloc(&pdev->dev, sizeof(*ssp), GFP_KERNEL); + if (!pdata) { + dev_err(&pdev->dev, + "failed to allocate memory for platform data\n"); + return NULL; } - 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); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return NULL; - return 0; -} + ssp = &pdata->ssp; -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); + ssp->phys_base = res->start; + ssp->mmio_base = devm_request_and_ioremap(&pdev->dev, res); + if (!ssp->mmio_base) { + dev_err(&pdev->dev, "failed to ioremap mmio_base\n"); + return NULL; } - if (!list_empty(&drv_data->queue) || drv_data->busy) - status = -EBUSY; + ssp->clk = devm_clk_get(&pdev->dev, NULL); + ssp->irq = platform_get_irq(pdev, 0); + ssp->type = LPSS_SSP; + ssp->pdev = pdev; - spin_unlock_irqrestore(&drv_data->lock, flags); + ssp->port_id = -1; + if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0, &devid)) + ssp->port_id = devid; - return status; -} + pdata->num_chipselect = 1; + pdata->rx_slave_id = -1; + pdata->tx_slave_id = -1; -static int destroy_queue(struct driver_data *drv_data) -{ - int status; + INIT_LIST_HEAD(&resource_list); + acpi_dev_get_resources(adev, &resource_list, pxa2xx_spi_acpi_add_dma, + pdata); + acpi_dev_free_resource_list(&resource_list); - 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; + pdata->enable_dma = pdata->rx_slave_id >= 0 && pdata->tx_slave_id >= 0; - destroy_workqueue(drv_data->workqueue); + return pdata; +} - return 0; +static struct acpi_device_id pxa2xx_spi_acpi_match[] = { + { "INT33C0", 0 }, + { "INT33C1", 0 }, + { }, +}; +MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match); +#else +static inline struct pxa2xx_spi_master * +pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev) +{ + return NULL; } +#endif static int pxa2xx_spi_probe(struct platform_device *pdev) { @@ -1535,11 +1135,21 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) struct ssp_device *ssp; int status; - platform_info = dev->platform_data; + platform_info = dev_get_platdata(dev); + if (!platform_info) { + platform_info = pxa2xx_spi_acpi_get_pdata(pdev); + if (!platform_info) { + dev_err(&pdev->dev, "missing platform data\n"); + return -ENODEV; + } + } ssp = pxa_ssp_request(pdev->id, pdev->name); - if (ssp == NULL) { - dev_err(&pdev->dev, "failed to request SSP%d\n", pdev->id); + if (!ssp) + ssp = &platform_info->ssp; + + if (!ssp->mmio_base) { + dev_err(&pdev->dev, "failed to get ssp\n"); return -ENODEV; } @@ -1558,19 +1168,21 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) master->dev.parent = &pdev->dev; master->dev.of_node = pdev->dev.of_node; + ACPI_HANDLE_SET(&master->dev, ACPI_HANDLE(&pdev->dev)); /* the spi->mode bits understood by this driver: */ - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP; - master->bus_num = pdev->id; + master->bus_num = ssp->port_id; master->num_chipselect = platform_info->num_chipselect; master->dma_alignment = DMA_ALIGNMENT; master->cleanup = cleanup; master->setup = setup; - master->transfer = transfer; + master->transfer_one_message = pxa2xx_spi_transfer_one_message; + master->prepare_transfer_hardware = pxa2xx_spi_prepare_transfer; + master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer; drv_data->ssp_type = ssp->type; - drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data + - sizeof(struct driver_data)), 8); + drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT); drv_data->ioaddr = ssp->mmio_base; drv_data->ssdr_physical = ssp->phys_base + SSDR; @@ -1581,7 +1193,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) 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->dma_cr1 = DEFAULT_DMA_CR1; drv_data->clear_sr = SSSR_ROR | SSSR_TINT; drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS | SSSR_ROR; } @@ -1597,35 +1209,17 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) 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; + status = pxa2xx_spi_dma_setup(drv_data); + if (status) { + dev_warn(dev, "failed to setup DMA, using PIO\n"); + platform_info->enable_dma = false; } - 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); + clk_prepare_enable(ssp->clk); + + drv_data->max_clk_rate = clk_get_rate(ssp->clk); /* Load default SSP configuration */ write_SSCR0(0, drv_data->ioaddr); @@ -1640,41 +1234,29 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) 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; - } + lpss_ssp_setup(drv_data); + + tasklet_init(&drv_data->pump_transfers, pump_transfers, + (unsigned long)drv_data); /* 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; + goto out_error_clock_enabled; } - return status; + pm_runtime_set_autosuspend_delay(&pdev->dev, 50); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); -out_error_queue_alloc: - destroy_queue(drv_data); + return status; 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: + clk_disable_unprepare(ssp->clk); + pxa2xx_spi_dma_release(drv_data); free_irq(ssp->irq, drv_data); out_error_master_alloc: @@ -1687,37 +1269,23 @@ 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"); + pm_runtime_get_sync(&pdev->dev); /* Disable the SSP at the peripheral and SOC level */ write_SSCR0(0, drv_data->ioaddr); - clk_disable(ssp->clk); + clk_disable_unprepare(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); - } + if (drv_data->master_info->enable_dma) + pxa2xx_spi_dma_release(drv_data); + + pm_runtime_put_noidle(&pdev->dev); + pm_runtime_disable(&pdev->dev); /* Release IRQ */ free_irq(ssp->irq, drv_data); @@ -1749,11 +1317,11 @@ static int pxa2xx_spi_suspend(struct device *dev) struct ssp_device *ssp = drv_data->ssp; int status = 0; - status = stop_queue(drv_data); + status = spi_master_suspend(drv_data->master); if (status != 0) return status; write_SSCR0(0, drv_data->ioaddr); - clk_disable(ssp->clk); + clk_disable_unprepare(ssp->clk); return 0; } @@ -1764,18 +1332,13 @@ static int pxa2xx_spi_resume(struct device *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; + pxa2xx_spi_dma_resume(drv_data); /* Enable the SSP clock */ - clk_enable(ssp->clk); + clk_prepare_enable(ssp->clk); /* Start the queue running */ - status = start_queue(drv_data); + status = spi_master_resume(drv_data->master); if (status != 0) { dev_err(dev, "problem starting queue (%d)\n", status); return status; @@ -1783,20 +1346,38 @@ static int pxa2xx_spi_resume(struct device *dev) return 0; } +#endif + +#ifdef CONFIG_PM_RUNTIME +static int pxa2xx_spi_runtime_suspend(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + + clk_disable_unprepare(drv_data->ssp->clk); + return 0; +} + +static int pxa2xx_spi_runtime_resume(struct device *dev) +{ + struct driver_data *drv_data = dev_get_drvdata(dev); + + clk_prepare_enable(drv_data->ssp->clk); + return 0; +} +#endif static const struct dev_pm_ops pxa2xx_spi_pm_ops = { - .suspend = pxa2xx_spi_suspend, - .resume = pxa2xx_spi_resume, + SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend, pxa2xx_spi_resume) + SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend, + pxa2xx_spi_runtime_resume, NULL) }; -#endif static struct platform_driver driver = { .driver = { .name = "pxa2xx-spi", .owner = THIS_MODULE, -#ifdef CONFIG_PM .pm = &pxa2xx_spi_pm_ops, -#endif + .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match), }, .probe = pxa2xx_spi_probe, .remove = pxa2xx_spi_remove, |