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i2c: at91: convert to dma_request_slave_channel_compat()

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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>
This commit is contained in:
Ludovic Desroches 2013-04-15 02:16:56 +00:00 committed by Wolfram Sang
parent 92b775c294
commit d877a721e2
1 changed files with 25 additions and 24 deletions
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49
drivers/i2c/busses/i2c-at91.c
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@ -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;
}