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spi: rspi: Add DT support to DMA setup 

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Geert Uytterhoeven 2014-08-06 14:59:02 +02:00 committed by Mark Brown
parent a30b95a7d8
commit e825b8dd2b
2 changed files with 27 additions and 13 deletions
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5
Documentation/devicetree/bindings/spi/spi-rspi.txt
View File

@ -30,6 +30,9 @@ Required properties:
Optional properties:
- clocks : Must contain a reference to the functional clock.
- dmas : Must contain a list of two references to DMA specifiers,
one for transmission, and one for reception.
- dma-names : Must contain a list of two DMA names, "tx" and "rx".
Pinctrl properties might be needed, too. See
Documentation/devicetree/bindings/pinctrl/renesas,*.
@ -58,4 +61,6 @@ Examples:
num-cs = <1>;
#address-cells = <1>;
#size-cells = <0>;
dmas = <&dmac0 0x17>, <&dmac0 0x18>;
dma-names = "tx", "rx";
};

35
drivers/spi/spi-rspi.c
View File

@ -909,10 +909,11 @@ static struct dma_chan *rspi_request_dma_chan(struct device *dev,
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);
chan = dma_request_channel(mask, shdma_chan_filter,
(void *)(unsigned long)id);
chan = dma_request_slave_channel_compat(mask, shdma_chan_filter,
(void *)(unsigned long)id, dev,
dir == DMA_MEM_TO_DEV ? "tx" : "rx");
if (!chan) {
dev_warn(dev, "dma_request_channel failed\n");
dev_warn(dev, "dma_request_slave_channel_compat failed\n");
return NULL;
}
@ -941,22 +942,30 @@ static int rspi_request_dma(struct device *dev, struct spi_master *master,
const struct resource *res)
{
const struct rspi_plat_data *rspi_pd = dev_get_platdata(dev);
unsigned int dma_tx_id, dma_rx_id;
if (!rspi_pd || !rspi_pd->dma_rx_id || !rspi_pd->dma_tx_id)
return 0; /* The driver assumes no error. */
if (dev->of_node) {
/* In the OF case we will get the slave IDs from the DT */
dma_tx_id = 0;
dma_rx_id = 0;
} else if (rspi_pd && rspi_pd->dma_tx_id && rspi_pd->dma_rx_id) {
dma_tx_id = rspi_pd->dma_tx_id;
dma_rx_id = rspi_pd->dma_rx_id;
} else {
/* The driver assumes no error. */
return 0;
}
master->dma_rx = rspi_request_dma_chan(dev, DMA_DEV_TO_MEM,
rspi_pd->dma_rx_id,
master->dma_tx = rspi_request_dma_chan(dev, DMA_MEM_TO_DEV, dma_tx_id,
res->start + RSPI_SPDR);
if (!master->dma_rx)
if (!master->dma_tx)
return -ENODEV;
master->dma_tx = rspi_request_dma_chan(dev, DMA_MEM_TO_DEV,
rspi_pd->dma_tx_id,
master->dma_rx = rspi_request_dma_chan(dev, DMA_DEV_TO_MEM, dma_rx_id,
res->start + RSPI_SPDR);
if (!master->dma_tx) {
dma_release_channel(master->dma_rx);
master->dma_rx = NULL;
if (!master->dma_rx) {
dma_release_channel(master->dma_tx);
master->dma_tx = NULL;
return -ENODEV;
}