diff options
| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi-img-spfi.txt | 1 | ||||
| -rw-r--r-- | drivers/spi/spi-img-spfi.c | 183 |
2 files changed, 101 insertions, 83 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-img-spfi.txt b/Documentation/devicetree/bindings/spi/spi-img-spfi.txt index c7dd50fb8eb2..e02fbf18c82c 100644 --- a/Documentation/devicetree/bindings/spi/spi-img-spfi.txt +++ b/Documentation/devicetree/bindings/spi/spi-img-spfi.txt @@ -14,6 +14,7 @@ Required properties: - dma-names: Must include the following entries: - rx - tx +- cs-gpios: Must specify the GPIOs used for chipselect lines. - #address-cells: Must be 1. - #size-cells: Must be 0. diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c index 7d18becc23cf..788e2b176a4f 100644 --- a/drivers/spi/spi-img-spfi.c +++ b/drivers/spi/spi-img-spfi.c @@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/dmaengine.h> +#include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> @@ -122,36 +123,31 @@ static inline void spfi_start(struct img_spfi *spfi) spfi_writel(spfi, val, SPFI_CONTROL); } -static inline void spfi_stop(struct img_spfi *spfi) -{ - u32 val; - - val = spfi_readl(spfi, SPFI_CONTROL); - val &= ~SPFI_CONTROL_SPFI_EN; - spfi_writel(spfi, val, SPFI_CONTROL); -} - static inline void spfi_reset(struct img_spfi *spfi) { spfi_writel(spfi, SPFI_CONTROL_SOFT_RESET, SPFI_CONTROL); - udelay(1); spfi_writel(spfi, 0, SPFI_CONTROL); } -static void spfi_flush_tx_fifo(struct img_spfi *spfi) +static int spfi_wait_all_done(struct img_spfi *spfi) { - unsigned long timeout = jiffies + msecs_to_jiffies(10); + unsigned long timeout = jiffies + msecs_to_jiffies(50); - spfi_writel(spfi, SPFI_INTERRUPT_SDE, SPFI_INTERRUPT_CLEAR); while (time_before(jiffies, timeout)) { - if (spfi_readl(spfi, SPFI_INTERRUPT_STATUS) & - SPFI_INTERRUPT_SDE) - return; + u32 status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS); + + if (status & SPFI_INTERRUPT_ALLDONETRIG) { + spfi_writel(spfi, SPFI_INTERRUPT_ALLDONETRIG, + SPFI_INTERRUPT_CLEAR); + return 0; + } cpu_relax(); } - dev_err(spfi->dev, "Timed out waiting for FIFO to drain\n"); + dev_err(spfi->dev, "Timed out waiting for transaction to complete\n"); spfi_reset(spfi); + + return -ETIMEDOUT; } static unsigned int spfi_pio_write32(struct img_spfi *spfi, const u32 *buf, @@ -237,6 +233,7 @@ static int img_spfi_start_pio(struct spi_master *master, const void *tx_buf = xfer->tx_buf; void *rx_buf = xfer->rx_buf; unsigned long timeout; + int ret; if (tx_buf) tx_bytes = xfer->len; @@ -269,16 +266,15 @@ static int img_spfi_start_pio(struct spi_master *master, cpu_relax(); } + ret = spfi_wait_all_done(spfi); + if (ret < 0) + return ret; + if (rx_bytes > 0 || tx_bytes > 0) { dev_err(spfi->dev, "PIO transfer timed out\n"); - spfi_reset(spfi); return -ETIMEDOUT; } - if (tx_buf) - spfi_flush_tx_fifo(spfi); - spfi_stop(spfi); - return 0; } @@ -287,14 +283,12 @@ static void img_spfi_dma_rx_cb(void *data) struct img_spfi *spfi = data; unsigned long flags; - spin_lock_irqsave(&spfi->lock, flags); + spfi_wait_all_done(spfi); + spin_lock_irqsave(&spfi->lock, flags); spfi->rx_dma_busy = false; - if (!spfi->tx_dma_busy) { - spfi_stop(spfi); + if (!spfi->tx_dma_busy) spi_finalize_current_transfer(spfi->master); - } - spin_unlock_irqrestore(&spfi->lock, flags); } @@ -303,16 +297,12 @@ static void img_spfi_dma_tx_cb(void *data) struct img_spfi *spfi = data; unsigned long flags; - spfi_flush_tx_fifo(spfi); + spfi_wait_all_done(spfi); spin_lock_irqsave(&spfi->lock, flags); - spfi->tx_dma_busy = false; - if (!spfi->rx_dma_busy) { - spfi_stop(spfi); + if (!spfi->rx_dma_busy) spi_finalize_current_transfer(spfi->master); - } - spin_unlock_irqrestore(&spfi->lock, flags); } @@ -397,6 +387,75 @@ stop_dma: return -EIO; } +static void img_spfi_handle_err(struct spi_master *master, + struct spi_message *msg) +{ + struct img_spfi *spfi = spi_master_get_devdata(master); + unsigned long flags; + + /* + * Stop all DMA and reset the controller if the previous transaction + * timed-out and never completed it's DMA. + */ + spin_lock_irqsave(&spfi->lock, flags); + if (spfi->tx_dma_busy || spfi->rx_dma_busy) { + spfi->tx_dma_busy = false; + spfi->rx_dma_busy = false; + + dmaengine_terminate_all(spfi->tx_ch); + dmaengine_terminate_all(spfi->rx_ch); + } + spin_unlock_irqrestore(&spfi->lock, flags); +} + +static int img_spfi_prepare(struct spi_master *master, struct spi_message *msg) +{ + struct img_spfi *spfi = spi_master_get_devdata(master); + u32 val; + + val = spfi_readl(spfi, SPFI_PORT_STATE); + if (msg->spi->mode & SPI_CPHA) + val |= SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select); + else + val &= ~SPFI_PORT_STATE_CK_PHASE(msg->spi->chip_select); + if (msg->spi->mode & SPI_CPOL) + val |= SPFI_PORT_STATE_CK_POL(msg->spi->chip_select); + else + val &= ~SPFI_PORT_STATE_CK_POL(msg->spi->chip_select); + spfi_writel(spfi, val, SPFI_PORT_STATE); + + return 0; +} + +static int img_spfi_unprepare(struct spi_master *master, + struct spi_message *msg) +{ + struct img_spfi *spfi = spi_master_get_devdata(master); + + spfi_reset(spfi); + + return 0; +} + +static int img_spfi_setup(struct spi_device *spi) +{ + int ret; + + ret = gpio_request_one(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ? + GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH, + dev_name(&spi->dev)); + if (ret) + dev_err(&spi->dev, "can't request chipselect gpio %d\n", + spi->cs_gpio); + + return ret; +} + +static void img_spfi_cleanup(struct spi_device *spi) +{ + gpio_free(spi->cs_gpio); +} + static void img_spfi_config(struct spi_master *master, struct spi_device *spi, struct spi_transfer *xfer) { @@ -416,6 +475,9 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi, val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT; spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select)); + spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT, + SPFI_TRANSACTION); + val = spfi_readl(spfi, SPFI_CONTROL); val &= ~(SPFI_CONTROL_SEND_DMA | SPFI_CONTROL_GET_DMA); if (xfer->tx_buf) @@ -429,25 +491,7 @@ static void img_spfi_config(struct spi_master *master, struct spi_device *spi, else if (xfer->tx_nbits == SPI_NBITS_QUAD && xfer->rx_nbits == SPI_NBITS_QUAD) val |= SPFI_CONTROL_TMODE_QUAD << SPFI_CONTROL_TMODE_SHIFT; - val &= ~SPFI_CONTROL_CONTINUE; - if (!xfer->cs_change && !list_is_last(&xfer->transfer_list, - &master->cur_msg->transfers)) - val |= SPFI_CONTROL_CONTINUE; spfi_writel(spfi, val, SPFI_CONTROL); - - val = spfi_readl(spfi, SPFI_PORT_STATE); - if (spi->mode & SPI_CPHA) - val |= SPFI_PORT_STATE_CK_PHASE(spi->chip_select); - else - val &= ~SPFI_PORT_STATE_CK_PHASE(spi->chip_select); - if (spi->mode & SPI_CPOL) - val |= SPFI_PORT_STATE_CK_POL(spi->chip_select); - else - val &= ~SPFI_PORT_STATE_CK_POL(spi->chip_select); - spfi_writel(spfi, val, SPFI_PORT_STATE); - - spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT, - SPFI_TRANSACTION); } static int img_spfi_transfer_one(struct spi_master *master, @@ -455,8 +499,6 @@ static int img_spfi_transfer_one(struct spi_master *master, struct spi_transfer *xfer) { struct img_spfi *spfi = spi_master_get_devdata(spi->master); - bool dma_reset = false; - unsigned long flags; int ret; if (xfer->len > SPFI_TRANSACTION_TSIZE_MASK) { @@ -466,23 +508,6 @@ static int img_spfi_transfer_one(struct spi_master *master, return -EINVAL; } - /* - * Stop all DMA and reset the controller if the previous transaction - * timed-out and never completed it's DMA. - */ - spin_lock_irqsave(&spfi->lock, flags); - if (spfi->tx_dma_busy || spfi->rx_dma_busy) { - dev_err(spfi->dev, "SPI DMA still busy\n"); - dma_reset = true; - } - spin_unlock_irqrestore(&spfi->lock, flags); - - if (dma_reset) { - dmaengine_terminate_all(spfi->tx_ch); - dmaengine_terminate_all(spfi->rx_ch); - spfi_reset(spfi); - } - img_spfi_config(master, spi, xfer); if (master->can_dma && master->can_dma(master, spi, xfer)) ret = img_spfi_start_dma(master, spi, xfer); @@ -492,17 +517,6 @@ static int img_spfi_transfer_one(struct spi_master *master, return ret; } -static void img_spfi_set_cs(struct spi_device *spi, bool enable) -{ - struct img_spfi *spfi = spi_master_get_devdata(spi->master); - u32 val; - - val = spfi_readl(spfi, SPFI_PORT_STATE); - val &= ~(SPFI_PORT_STATE_DEV_SEL_MASK << SPFI_PORT_STATE_DEV_SEL_SHIFT); - val |= spi->chip_select << SPFI_PORT_STATE_DEV_SEL_SHIFT; - spfi_writel(spfi, val, SPFI_PORT_STATE); -} - static bool img_spfi_can_dma(struct spi_master *master, struct spi_device *spi, struct spi_transfer *xfer) { @@ -591,14 +605,17 @@ static int img_spfi_probe(struct platform_device *pdev) master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL; if (of_property_read_bool(spfi->dev->of_node, "img,supports-quad-mode")) master->mode_bits |= SPI_TX_QUAD | SPI_RX_QUAD; - master->num_chipselect = 5; master->dev.of_node = pdev->dev.of_node; master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(8); master->max_speed_hz = clk_get_rate(spfi->spfi_clk) / 4; master->min_speed_hz = clk_get_rate(spfi->spfi_clk) / 512; - master->set_cs = img_spfi_set_cs; + master->setup = img_spfi_setup; + master->cleanup = img_spfi_cleanup; master->transfer_one = img_spfi_transfer_one; + master->prepare_message = img_spfi_prepare; + master->unprepare_message = img_spfi_unprepare; + master->handle_err = img_spfi_handle_err; spfi->tx_ch = dma_request_slave_channel(spfi->dev, "tx"); spfi->rx_ch = dma_request_slave_channel(spfi->dev, "rx"); |