aboutsummaryrefslogtreecommitdiff
path: root/drivers/i2c/busses
diff options
context:
space:
mode:
authorLudovic Desroches <ludovic.desroches@atmel.com>2013-04-15 02:16:56 +0000
committerWolfram Sang <wsa@the-dreams.de>2013-04-16 11:10:14 +0200
commitd877a721e2a6afea3dfdd494b7d463137b6e6c6b (patch)
treefb87bc600f458430d4b510d41197bcd11688e2db /drivers/i2c/busses
parent92b775c2949287e675fdb3cac96bb0cda64efbfe (diff)
downloadvexpress-lsk-d877a721e2a6afea3dfdd494b7d463137b6e6c6b.tar.gz
i2c: at91: convert to dma_request_slave_channel_compat()
Use generic DMA DT helper. Platforms booting with or without DT populated are both supported. Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-at91.c49
1 files changed, 25 insertions, 24 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 2fcd2755233..6bb839b688b 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -605,11 +605,16 @@ static const struct of_device_id atmel_twi_dt_ids[] = {
MODULE_DEVICE_TABLE(of, atmel_twi_dt_ids);
#endif
-static bool filter(struct dma_chan *chan, void *slave)
+static bool filter(struct dma_chan *chan, void *pdata)
{
- struct at_dma_slave *sl = slave;
+ struct at91_twi_pdata *sl_pdata = pdata;
+ struct at_dma_slave *sl;
- if (sl->dma_dev == chan->device->dev) {
+ if (!sl_pdata)
+ return false;
+
+ sl = &sl_pdata->dma_slave;
+ if (sl && (sl->dma_dev == chan->device->dev)) {
chan->private = sl;
return true;
} else {
@@ -620,11 +625,10 @@ static bool filter(struct dma_chan *chan, void *slave)
static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
{
int ret = 0;
- struct at_dma_slave *sdata;
+ struct at91_twi_pdata *pdata = dev->pdata;
struct dma_slave_config slave_config;
struct at91_twi_dma *dma = &dev->dma;
-
- sdata = &dev->pdata->dma_slave;
+ dma_cap_mask_t mask;
memset(&slave_config, 0, sizeof(slave_config));
slave_config.src_addr = (dma_addr_t)phy_addr + AT91_TWI_RHR;
@@ -635,25 +639,22 @@ static int at91_twi_configure_dma(struct at91_twi_dev *dev, u32 phy_addr)
slave_config.dst_maxburst = 1;
slave_config.device_fc = false;
- if (sdata && sdata->dma_dev) {
- dma_cap_mask_t mask;
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
- dma->chan_tx = dma_request_channel(mask, filter, sdata);
- if (!dma->chan_tx) {
- dev_err(dev->dev, "no DMA channel available for tx\n");
- ret = -EBUSY;
- goto error;
- }
- dma->chan_rx = dma_request_channel(mask, filter, sdata);
- if (!dma->chan_rx) {
- dev_err(dev->dev, "no DMA channel available for rx\n");
- ret = -EBUSY;
- goto error;
- }
- } else {
- ret = -EINVAL;
+ dma->chan_tx = dma_request_slave_channel_compat(mask, filter, pdata,
+ dev->dev, "tx");
+ if (!dma->chan_tx) {
+ dev_err(dev->dev, "can't get a DMA channel for tx\n");
+ ret = -EBUSY;
+ goto error;
+ }
+
+ dma->chan_rx = dma_request_slave_channel_compat(mask, filter, pdata,
+ dev->dev, "rx");
+ if (!dma->chan_rx) {
+ dev_err(dev->dev, "can't get a DMA channel for rx\n");
+ ret = -EBUSY;
goto error;
}