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authorPeter Ujfalusi <peter.ujfalusi@ti.com>2016-05-04 11:23:08 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2016-05-04 14:12:00 +0300
commitd15b08fb2246fa28b4cf01337951026177641af4 (patch)
treec8481feb27e58a604253d49507237b6ef3f32be4 /drivers/mmc/host/omap.c
parent437db4c6e79881d33aca521987188c728df350a8 (diff)
downloadlinux-d15b08fb2246fa28b4cf01337951026177641af4.tar.xz
mmc: omap: Use dma_request_chan() for requesting DMA channel
With the new dma_request_chan() the client driver does not need to look for the DMA resource and it does not need to pass filter_fn anymore. By switching to the new API the driver can now support deferred probing against DMA. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> CC: Ulf Hansson <ulf.hansson@linaro.org> CC: Jarkko Nikula <jarkko.nikula@bitmer.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/omap.c')
-rw-r--r--drivers/mmc/host/omap.c48
1 files changed, 25 insertions, 23 deletions
diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
index b9958a123594..f23d65eb070d 100644
--- a/drivers/mmc/host/omap.c
+++ b/drivers/mmc/host/omap.c
@@ -23,7 +23,6 @@
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/of.h>
-#include <linux/omap-dma.h>
#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
@@ -1321,8 +1320,6 @@ static int mmc_omap_probe(struct platform_device *pdev)
struct omap_mmc_platform_data *pdata = pdev->dev.platform_data;
struct mmc_omap_host *host = NULL;
struct resource *res;
- dma_cap_mask_t mask;
- unsigned sig = 0;
int i, ret = 0;
int irq;
@@ -1382,29 +1379,34 @@ static int mmc_omap_probe(struct platform_device *pdev)
goto err_free_iclk;
}
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
host->dma_tx_burst = -1;
host->dma_rx_burst = -1;
- res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
- if (res)
- sig = res->start;
- host->dma_tx = dma_request_slave_channel_compat(mask,
- omap_dma_filter_fn, &sig, &pdev->dev, "tx");
- if (!host->dma_tx)
- dev_warn(host->dev, "unable to obtain TX DMA engine channel %u\n",
- sig);
-
- res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
- if (res)
- sig = res->start;
- host->dma_rx = dma_request_slave_channel_compat(mask,
- omap_dma_filter_fn, &sig, &pdev->dev, "rx");
- if (!host->dma_rx)
- dev_warn(host->dev, "unable to obtain RX DMA engine channel %u\n",
- sig);
+ host->dma_tx = dma_request_chan(&pdev->dev, "tx");
+ if (IS_ERR(host->dma_tx)) {
+ ret = PTR_ERR(host->dma_tx);
+ if (ret == -EPROBE_DEFER) {
+ clk_put(host->fclk);
+ goto err_free_iclk;
+ }
+
+ host->dma_tx = NULL;
+ dev_warn(host->dev, "TX DMA channel request failed\n");
+ }
+
+ host->dma_rx = dma_request_chan(&pdev->dev, "rx");
+ if (IS_ERR(host->dma_rx)) {
+ ret = PTR_ERR(host->dma_rx);
+ if (ret == -EPROBE_DEFER) {
+ if (host->dma_tx)
+ dma_release_channel(host->dma_tx);
+ clk_put(host->fclk);
+ goto err_free_iclk;
+ }
+
+ host->dma_rx = NULL;
+ dev_warn(host->dev, "RX DMA channel request failed\n");
+ }
ret = request_irq(host->irq, mmc_omap_irq, 0, DRIVER_NAME, host);
if (ret)