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authorMark Brown <broonie@kernel.org>2015-04-11 23:09:01 +0100
committerMark Brown <broonie@kernel.org>2015-04-11 23:09:01 +0100
commit19655dd083290c371cbb5279839314a6927d9082 (patch)
tree9a598790ab2c1dac0f50a398d16a9ff75cd584f8 /drivers
parente897f795a925c95082b6890c6c6a00286b702012 (diff)
parent8c2c8c03cdcb9b0a75b5585e611715fdd8096c38 (diff)
downloadkernel-19655dd083290c371cbb5279839314a6927d9082.tar.gz
Merge remote-tracking branch 'spi/topic/img-spfi' into spi-next
Diffstat (limited to 'drivers')
-rw-r--r--drivers/spi/spi-img-spfi.c183
1 files changed, 100 insertions, 83 deletions
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");