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spi: tegra: convert to standard DMA DT bindings
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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>
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Stephen Warren committed Dec 11, 2013
1 parent ff2251e commit a915d15
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Showing 2 changed files with 34 additions and 62 deletions.
48 changes: 17 additions & 31 deletions drivers/spi/spi-tegra114.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -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;

Expand Down Expand Up @@ -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,
Expand All @@ -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;
Expand Down Expand Up @@ -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))
Expand Down Expand Up @@ -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);

Expand Down
48 changes: 17 additions & 31 deletions drivers/spi/spi-tegra20-slink.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -171,7 +171,6 @@ struct tegra_slink_data {
void __iomem *base;
phys_addr_t phys;
unsigned irq;
int dma_req_sel;
u32 spi_max_frequency;
u32 cur_speed;

Expand Down Expand Up @@ -630,15 +629,15 @@ static int tegra_slink_init_dma_param(struct tegra_slink_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(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,
Expand All @@ -649,7 +648,6 @@ static int tegra_slink_init_dma_param(struct tegra_slink_data *tspi,
return -ENOMEM;
}

dma_sconfig.slave_id = tspi->dma_req_sel;
if (dma_to_memory) {
dma_sconfig.src_addr = tspi->phys + SLINK_RX_FIFO;
dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
Expand Down Expand Up @@ -1021,11 +1019,6 @@ static irqreturn_t tegra_slink_isr(int irq, void *context_data)
static void tegra_slink_parse_dt(struct tegra_slink_data *tspi)
{
struct device_node *np = tspi->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))
Expand Down Expand Up @@ -1129,22 +1122,15 @@ static int tegra_slink_probe(struct platform_device *pdev)
tspi->max_buf_size = SLINK_FIFO_DEPTH << 2;
tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;

if (tspi->dma_req_sel) {
ret = tegra_slink_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_slink_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_slink_init_dma_param(tspi, true);
if (ret < 0)
goto exit_free_irq;
ret = tegra_slink_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);

Expand Down

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