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authorPadmavathi Venna <padma.v@samsung.com>2013-01-18 17:17:03 +0530
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-01-29 14:28:52 +0800
commitb5be04d35dbb2e00ab27a97bfd26e17019e857ef (patch)
tree967d77cab993164bdd77f072c945844aca72a433 /drivers/spi
parente7ba5f1d0f6292e1b99c63cc4bb74c70232e9065 (diff)
downloadop-kernel-dev-b5be04d35dbb2e00ab27a97bfd26e17019e857ef.zip
op-kernel-dev-b5be04d35dbb2e00ab27a97bfd26e17019e857ef.tar.gz
spi: s3c64xx: Modify SPI driver to use generic DMA DT support
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-s3c64xx.c77
1 files changed, 23 insertions, 54 deletions
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index ad93231..51a8c42 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -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;
+
+ 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;
+ }
- ret = s3c64xx_spi_get_dmares(sdd, false);
- if (ret)
- goto err0;
+ 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;
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