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authorNenghua Cao <nhcao@marvell.com>2014-01-20 20:39:01 +0800
committerVinod Koul <vinod.koul@intel.com>2014-03-06 14:49:54 +0530
commit7dedc002c0ec676590bf78ae8d76f2ffd51564f6 (patch)
tree728cd0881737a0e7032a7e585803190af4c68253 /drivers/dma/mmp_tdma.c
parentf0b507774449ec35fbfd7173e5fc7dd4df71a81c (diff)
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dma: mmp_tdma: move to generic device tree binding
This patch makes the mmp_tdma controller able to provide DMA resources in DT environments by providing an dma xlate function to get the generic DMA device tree helper support. Then DMA clients only need to call dma_request_slave_channel() for requesting a DMA channel from dmaengine. Signed-off-by: Nenghua Cao <nhcao@marvell.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/mmp_tdma.c')
-rw-r--r--drivers/dma/mmp_tdma.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
index 33f96aaa80c7..724f7f4c9720 100644
--- a/drivers/dma/mmp_tdma.c
+++ b/drivers/dma/mmp_tdma.c
@@ -22,6 +22,7 @@
#include <mach/regs-icu.h>
#include <linux/platform_data/dma-mmp_tdma.h>
#include <linux/of_device.h>
+#include <linux/of_dma.h>
#include "dmaengine.h"
@@ -541,6 +542,45 @@ static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
return 0;
}
+struct mmp_tdma_filter_param {
+ struct device_node *of_node;
+ unsigned int chan_id;
+};
+
+static bool mmp_tdma_filter_fn(struct dma_chan *chan, void *fn_param)
+{
+ struct mmp_tdma_filter_param *param = fn_param;
+ struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+ struct dma_device *pdma_device = tdmac->chan.device;
+
+ if (pdma_device->dev->of_node != param->of_node)
+ return false;
+
+ if (chan->chan_id != param->chan_id)
+ return false;
+
+ return true;
+}
+
+struct dma_chan *mmp_tdma_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct mmp_tdma_device *tdev = ofdma->of_dma_data;
+ dma_cap_mask_t mask = tdev->device.cap_mask;
+ struct mmp_tdma_filter_param param;
+
+ if (dma_spec->args_count != 1)
+ return NULL;
+
+ param.of_node = ofdma->of_node;
+ param.chan_id = dma_spec->args[0];
+
+ if (param.chan_id >= TDMA_CHANNEL_NUM)
+ return NULL;
+
+ return dma_request_channel(mask, mmp_tdma_filter_fn, &param);
+}
+
static struct of_device_id mmp_tdma_dt_ids[] = {
{ .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA},
{ .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU},
@@ -631,6 +671,16 @@ static int mmp_tdma_probe(struct platform_device *pdev)
return ret;
}
+ if (pdev->dev.of_node) {
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ mmp_tdma_xlate, tdev);
+ if (ret) {
+ dev_err(tdev->device.dev,
+ "failed to register controller\n");
+ dma_async_device_unregister(&tdev->device);
+ }
+ }
+
dev_info(tdev->device.dev, "initialized\n");
return 0;
}