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authorStephen Warren <swarren@nvidia.com>2013-11-12 00:13:47 +0400
committerStephen Warren <swarren@nvidia.com>2013-12-12 03:44:23 +0400
commita915d150f68d8fd8ad72de6d9d4d7be26813b214 (patch)
tree821641c84881d27bb5d8b1fe9a3fc83667f9472c /drivers/spi/spi-tegra114.c
parentff2251e3de37b002e2e91e4917119f5776e210e3 (diff)
downloadlinux-a915d150f68d8fd8ad72de6d9d4d7be26813b214.tar.xz
spi: tegra: convert to standard DMA DT bindings
By using dma_request_slave_channel_or_err(), the DMA slave ID can be looked up from standard DT properties, and squirrelled away during channel allocation. Hence, there's no need to use a custom DT property to store the slave ID. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-tegra114.c')
-rw-r--r--drivers/spi/spi-tegra114.c48
1 files changed, 17 insertions, 31 deletions
diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index f62e6e5e90e3..c8604981a058 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -178,7 +178,6 @@ struct tegra_spi_data {
void __iomem *base;
phys_addr_t phys;
unsigned irq;
- int dma_req_sel;
u32 spi_max_frequency;
u32 cur_speed;
@@ -601,15 +600,15 @@ static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi,
dma_addr_t dma_phys;
int ret;
struct dma_slave_config dma_sconfig;
- dma_cap_mask_t mask;
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- dma_chan = dma_request_channel(mask, NULL, NULL);
- if (!dma_chan) {
- dev_err(tspi->dev,
- "Dma channel is not available, will try later\n");
- return -EPROBE_DEFER;
+ dma_chan = dma_request_slave_channel_reason(tspi->dev,
+ dma_to_memory ? "rx" : "tx");
+ if (IS_ERR(dma_chan)) {
+ ret = PTR_ERR(dma_chan);
+ if (ret != -EPROBE_DEFER)
+ dev_err(tspi->dev,
+ "Dma channel is not available: %d\n", ret);
+ return ret;
}
dma_buf = dma_alloc_coherent(tspi->dev, tspi->dma_buf_size,
@@ -620,7 +619,6 @@ static int tegra_spi_init_dma_param(struct tegra_spi_data *tspi,
return -ENOMEM;
}
- dma_sconfig.slave_id = tspi->dma_req_sel;
if (dma_to_memory) {
dma_sconfig.src_addr = tspi->phys + SPI_RX_FIFO;
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
@@ -1055,11 +1053,6 @@ static void tegra_spi_parse_dt(struct platform_device *pdev,
struct tegra_spi_data *tspi)
{
struct device_node *np = pdev->dev.of_node;
- u32 of_dma[2];
-
- if (of_property_read_u32_array(np, "nvidia,dma-request-selector",
- of_dma, 2) >= 0)
- tspi->dma_req_sel = of_dma[1];
if (of_property_read_u32(np, "spi-max-frequency",
&tspi->spi_max_frequency))
@@ -1138,22 +1131,15 @@ static int tegra_spi_probe(struct platform_device *pdev)
tspi->max_buf_size = SPI_FIFO_DEPTH << 2;
tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;
- if (tspi->dma_req_sel) {
- ret = tegra_spi_init_dma_param(tspi, true);
- if (ret < 0) {
- dev_err(&pdev->dev, "RxDma Init failed, err %d\n", ret);
- goto exit_free_irq;
- }
-
- ret = tegra_spi_init_dma_param(tspi, false);
- if (ret < 0) {
- dev_err(&pdev->dev, "TxDma Init failed, err %d\n", ret);
- goto exit_rx_dma_free;
- }
- tspi->max_buf_size = tspi->dma_buf_size;
- init_completion(&tspi->tx_dma_complete);
- init_completion(&tspi->rx_dma_complete);
- }
+ ret = tegra_spi_init_dma_param(tspi, true);
+ if (ret < 0)
+ goto exit_free_irq;
+ ret = tegra_spi_init_dma_param(tspi, false);
+ if (ret < 0)
+ goto exit_rx_dma_free;
+ tspi->max_buf_size = tspi->dma_buf_size;
+ init_completion(&tspi->tx_dma_complete);
+ init_completion(&tspi->rx_dma_complete);
init_completion(&tspi->xfer_completion);