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spi: s3c64xx: Modify SPI driver to use generic DMA DT support

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This patch modifies the SPI driver to use generic dma dt bindings
support. This passes all the required arguments to dma dev request
functon which in turn calls the dma_request_slave_channel or dma__
request_channel based on DT or non-DT respectively.

Signed-off-by: Padmavathi Venna <padma.v@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Padmavathi Venna 2013-01-18 17:17:03 +05:30 committed by Mark Brown
parent e7ba5f1d0f
commit b5be04d35d
1 changed files with 23 additions and 54 deletions
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77
drivers/spi/spi-s3c64xx.c
View file

@ -134,7 +134,6 @@ struct s3c64xx_spi_dma_data {
unsigned ch;
enum dma_transfer_direction direction;
enum dma_ch dmach;
struct property *dma_prop;
};
/**
@ -319,16 +318,15 @@ static void prepare_dma(struct s3c64xx_spi_dma_data *dma,
static int acquire_dma(struct s3c64xx_spi_driver_data *sdd)
{
struct samsung_dma_req req;
struct device *dev = &sdd->pdev->dev;
sdd->ops = samsung_dma_get_ops();
req.cap = DMA_SLAVE;
req.client = &s3c64xx_spi_dma_client;
req.dt_dmach_prop = sdd->rx_dma.dma_prop;
sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &req);
req.dt_dmach_prop = sdd->tx_dma.dma_prop;
sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &req);
sdd->rx_dma.ch = sdd->ops->request(sdd->rx_dma.dmach, &req, dev, "rx");
sdd->tx_dma.ch = sdd->ops->request(sdd->tx_dma.dmach, &req, dev, "tx");
return 1;
}
@ -1054,49 +1052,6 @@ static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
flush_fifo(sdd);
}
static int s3c64xx_spi_get_dmares(
struct s3c64xx_spi_driver_data *sdd, bool tx)
{
struct platform_device *pdev = sdd->pdev;
struct s3c64xx_spi_dma_data *dma_data;
struct property *prop;
struct resource *res;
char prop_name[15], *chan_str;
if (tx) {
dma_data = &sdd->tx_dma;
dma_data->direction = DMA_MEM_TO_DEV;
chan_str = "tx";
} else {
dma_data = &sdd->rx_dma;
dma_data->direction = DMA_DEV_TO_MEM;
chan_str = "rx";
}
if (!sdd->pdev->dev.of_node) {
res = platform_get_resource(pdev, IORESOURCE_DMA, tx ? 0 : 1);
if (!res) {
dev_err(&pdev->dev, "Unable to get SPI-%s dma "
"resource\n", chan_str);
return -ENXIO;
}
dma_data->dmach = res->start;
return 0;
}
sprintf(prop_name, "%s-dma-channel", chan_str);
prop = of_find_property(pdev->dev.of_node, prop_name, NULL);
if (!prop) {
dev_err(&pdev->dev, "%s dma channel property not specified\n",
chan_str);
return -ENXIO;
}
dma_data->dmach = DMACH_DT_PROP;
dma_data->dma_prop = prop;
return 0;
}
#ifdef CONFIG_OF
static int s3c64xx_spi_parse_dt_gpio(struct s3c64xx_spi_driver_data *sdd)
{
@ -1198,6 +1153,7 @@ static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config(
static int __init s3c64xx_spi_probe(struct platform_device *pdev)
{
struct resource *mem_res;
struct resource *res;
struct s3c64xx_spi_driver_data *sdd;
struct s3c64xx_spi_info *sci = pdev->dev.platform_data;
struct spi_master *master;
@ -1256,13 +1212,26 @@ static int __init s3c64xx_spi_probe(struct platform_device *pdev)
sdd->cur_bpw = 8;
ret = s3c64xx_spi_get_dmares(sdd, true);
if (ret)
goto err0;
if (!sdd->pdev->dev.of_node) {
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
if (!res) {
dev_err(&pdev->dev, "Unable to get SPI tx dma "
"resource\n");
return -ENXIO;
}
sdd->tx_dma.dmach = res->start;
ret = s3c64xx_spi_get_dmares(sdd, false);
if (ret)
goto err0;
res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
if (!res) {
dev_err(&pdev->dev, "Unable to get SPI rx dma "
"resource\n");
return -ENXIO;
}
sdd->rx_dma.dmach = res->start;
}
sdd->tx_dma.direction = DMA_MEM_TO_DEV;
sdd->rx_dma.direction = DMA_DEV_TO_MEM;
master->dev.of_node = pdev->dev.of_node;
master->bus_num = sdd->port_id;