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spi: pxa2xx: Switch to SPI core DMA mapping functionality

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SPI core provides DMA mapping with scatterlists. Start using it instead
of own implementation in spi-pxa2xx. Major difference in addition to
bunch of removed boilerplate code is that SPI core does
mapping/unmapping for all transfers in a message before and after the
message sending where spi-pxa2xx did mapping/unmapping for each
transfers separately.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Jarkko Nikula
2016-06-21 13:21:34 +03:00
committed by Mark Brown
parent 2d7537d8f6
commit b6ced294fb
3 changed files with 50 additions and 157 deletions
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drivers/spi/spi-pxa2xx.c
+21 -7
View File
@@ -912,6 +912,17 @@ static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
return clk_div << 8;
}
static bool pxa2xx_spi_can_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct chip_data *chip = spi_get_ctldata(spi);
return chip->enable_dma &&
xfer->len <= MAX_DMA_LEN &&
xfer->len >= chip->dma_burst_size;
}
static void pump_transfers(unsigned long data)
{
struct driver_data *drv_data = (struct driver_data *)data;
@@ -929,6 +940,7 @@ static void pump_transfers(unsigned long data)
u32 dma_burst = drv_data->cur_chip->dma_burst_size;
u32 change_mask = pxa2xx_spi_get_ssrc1_change_mask(drv_data);
int err;
int dma_mapped;
/* Get current state information */
message = drv_data->cur_msg;
@@ -963,7 +975,7 @@ static void pump_transfers(unsigned long data)
}
/* Check if we can DMA this transfer */
if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip->enable_dma) {
if (transfer->len > MAX_DMA_LEN && chip->enable_dma) {
/* reject already-mapped transfers; PIO won't always work */
if (message->is_dma_mapped
@@ -1040,10 +1052,10 @@ static void pump_transfers(unsigned long data)
message->state = RUNNING_STATE;
drv_data->dma_mapped = 0;
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) {
dma_mapped = master->can_dma &&
master->can_dma(master, message->spi, transfer) &&
master->cur_msg_mapped;
if (dma_mapped) {
/* Ensure we have the correct interrupt handler */
drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
@@ -1075,12 +1087,12 @@ static void pump_transfers(unsigned long data)
dev_dbg(&message->spi->dev, "%u Hz actual, %s\n",
master->max_speed_hz
/ (1 + ((cr0 & SSCR0_SCR(0xfff)) >> 8)),
drv_data->dma_mapped ? "DMA" : "PIO");
dma_mapped ? "DMA" : "PIO");
else
dev_dbg(&message->spi->dev, "%u Hz actual, %s\n",
master->max_speed_hz / 2
/ (1 + ((cr0 & SSCR0_SCR(0x0ff)) >> 8)),
drv_data->dma_mapped ? "DMA" : "PIO");
dma_mapped ? "DMA" : "PIO");
if (is_lpss_ssp(drv_data)) {
if ((pxa2xx_spi_read(drv_data, SSIRF) & 0xff)
@@ -1594,6 +1606,8 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
if (status) {
dev_dbg(dev, "no DMA channels available, using PIO\n");
platform_info->enable_dma = false;
} else {
master->can_dma = pxa2xx_spi_can_dma;
}
}