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spi/s3c64xx: Use core DMA mapping code with dmaengine

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When using dmaengine allow the core to do the DMA mapping. We still need
local mapping code for the non-dmaengine case so this doesn't save us
anything for now.

Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Mark Brown 2014-01-16 12:25:46 +00:00
parent 6ad45a27cb
commit 3f29588795
1 changed files with 103 additions and 75 deletions
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178
drivers/spi/spi-s3c64xx.c
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@ -291,6 +291,81 @@ static struct s3c2410_dma_client s3c64xx_spi_dma_client = {
.name = "samsung-spi-dma", .name = "samsung-spi-dma",
}; };
static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
struct device *dev = &sdd->pdev->dev;
struct spi_transfer *xfer;
if (is_polling(sdd) || msg->is_dma_mapped)
return 0;
/* First mark all xfer unmapped */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
xfer->rx_dma = XFER_DMAADDR_INVALID;
xfer->tx_dma = XFER_DMAADDR_INVALID;
}
/* Map until end or first fail */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
continue;
if (xfer->tx_buf != NULL) {
xfer->tx_dma = dma_map_single(dev,
(void *)xfer->tx_buf, xfer->len,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, xfer->tx_dma)) {
dev_err(dev, "dma_map_single Tx failed\n");
xfer->tx_dma = XFER_DMAADDR_INVALID;
return -ENOMEM;
}
}
if (xfer->rx_buf != NULL) {
xfer->rx_dma = dma_map_single(dev, xfer->rx_buf,
xfer->len, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, xfer->rx_dma)) {
dev_err(dev, "dma_map_single Rx failed\n");
dma_unmap_single(dev, xfer->tx_dma,
xfer->len, DMA_TO_DEVICE);
xfer->tx_dma = XFER_DMAADDR_INVALID;
xfer->rx_dma = XFER_DMAADDR_INVALID;
return -ENOMEM;
}
}
}
return 0;
}
static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
struct device *dev = &sdd->pdev->dev;
struct spi_transfer *xfer;
if (is_polling(sdd) || msg->is_dma_mapped)
return;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
continue;
if (xfer->rx_buf != NULL
&& xfer->rx_dma != XFER_DMAADDR_INVALID)
dma_unmap_single(dev, xfer->rx_dma,
xfer->len, DMA_FROM_DEVICE);
if (xfer->tx_buf != NULL
&& xfer->tx_dma != XFER_DMAADDR_INVALID)
dma_unmap_single(dev, xfer->tx_dma,
xfer->len, DMA_TO_DEVICE);
}
}
static void prepare_dma(struct s3c64xx_spi_dma_data *dma, static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
unsigned len, dma_addr_t buf) unsigned len, dma_addr_t buf)
{ {
@ -378,8 +453,22 @@ static void s3c64xx_spi_dma_stop(struct s3c64xx_spi_driver_data *sdd,
{ {
sdd->ops->stop((enum dma_ch)dma->ch); sdd->ops->stop((enum dma_ch)dma->ch);
} }
#define s3c64xx_spi_can_dma NULL
#else #else
static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
return 0;
}
static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
}
static void prepare_dma(struct s3c64xx_spi_dma_data *dma, static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
struct sg_table *sgt) struct sg_table *sgt)
{ {
@ -437,6 +526,7 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
ret = -EBUSY; ret = -EBUSY;
goto out; goto out;
} }
spi->dma_rx = sdd->rx_dma.ch;
sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter, sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter,
(void *)sdd->tx_dma.dmach, dev, "tx"); (void *)sdd->tx_dma.dmach, dev, "tx");
@ -445,6 +535,7 @@ static int s3c64xx_spi_prepare_transfer(struct spi_master *spi)
ret = -EBUSY; ret = -EBUSY;
goto out_rx; goto out_rx;
} }
spi->dma_tx = sdd->tx_dma.ch;
} }
ret = pm_runtime_get_sync(&sdd->pdev->dev); ret = pm_runtime_get_sync(&sdd->pdev->dev);
@ -482,6 +573,16 @@ static void s3c64xx_spi_dma_stop(struct s3c64xx_spi_driver_data *sdd,
{ {
dmaengine_terminate_all(dma->ch); dmaengine_terminate_all(dma->ch);
} }
static bool s3c64xx_spi_can_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master);
return xfer->len > (FIFO_LVL_MASK(sdd) >> 1) + 1;
}
#endif #endif
static void enable_datapath(struct s3c64xx_spi_driver_data *sdd, static void enable_datapath(struct s3c64xx_spi_driver_data *sdd,
@ -764,81 +865,6 @@ static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd)
#define XFER_DMAADDR_INVALID DMA_BIT_MASK(32) #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32)
static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
struct device *dev = &sdd->pdev->dev;
struct spi_transfer *xfer;
if (is_polling(sdd) || msg->is_dma_mapped)
return 0;
/* First mark all xfer unmapped */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
xfer->rx_dma = XFER_DMAADDR_INVALID;
xfer->tx_dma = XFER_DMAADDR_INVALID;
}
/* Map until end or first fail */
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
continue;
if (xfer->tx_buf != NULL) {
xfer->tx_dma = dma_map_single(dev,
(void *)xfer->tx_buf, xfer->len,
DMA_TO_DEVICE);
if (dma_mapping_error(dev, xfer->tx_dma)) {
dev_err(dev, "dma_map_single Tx failed\n");
xfer->tx_dma = XFER_DMAADDR_INVALID;
return -ENOMEM;
}
}
if (xfer->rx_buf != NULL) {
xfer->rx_dma = dma_map_single(dev, xfer->rx_buf,
xfer->len, DMA_FROM_DEVICE);
if (dma_mapping_error(dev, xfer->rx_dma)) {
dev_err(dev, "dma_map_single Rx failed\n");
dma_unmap_single(dev, xfer->tx_dma,
xfer->len, DMA_TO_DEVICE);
xfer->tx_dma = XFER_DMAADDR_INVALID;
xfer->rx_dma = XFER_DMAADDR_INVALID;
return -ENOMEM;
}
}
}
return 0;
}
static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd,
struct spi_message *msg)
{
struct device *dev = &sdd->pdev->dev;
struct spi_transfer *xfer;
if (is_polling(sdd) || msg->is_dma_mapped)
return;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1))
continue;
if (xfer->rx_buf != NULL
&& xfer->rx_dma != XFER_DMAADDR_INVALID)
dma_unmap_single(dev, xfer->rx_dma,
xfer->len, DMA_FROM_DEVICE);
if (xfer->tx_buf != NULL
&& xfer->tx_dma != XFER_DMAADDR_INVALID)
dma_unmap_single(dev, xfer->tx_dma,
xfer->len, DMA_TO_DEVICE);
}
}
static int s3c64xx_spi_prepare_message(struct spi_master *master, static int s3c64xx_spi_prepare_message(struct spi_master *master,
struct spi_message *msg) struct spi_message *msg)
{ {
@ -1338,6 +1364,8 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
/* the spi->mode bits understood by this driver: */ /* 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;
master->auto_runtime_pm = true; master->auto_runtime_pm = true;
if (!is_polling(sdd))
master->can_dma = s3c64xx_spi_can_dma;
sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res); sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res);
if (IS_ERR(sdd->regs)) { if (IS_ERR(sdd->regs)) {