MX28: DMA: make the DMA timeout configurable

[karo-tx-uboot.git] / drivers / dma / apbh_dma.c

diff --git a/drivers/dma/apbh_dma.c b/drivers/dma/apbh_dma.c
index 042e0ef5fb548325f7fdfe717ef7ece443cb73a4..eab87bc9f4d6fe381684510787386a9e81c6ead8 100644 (file)
--- a/drivers/dma/apbh_dma.c
+++ b/drivers/dma/apbh_dma.c
@@ -290,6 +290,7 @@ static int mxs_dma_request(int channel)
        pchan->flags |= MXS_DMA_FLAGS_ALLOCATED;
        pchan->active_num = 0;
        pchan->pending_num = 0;
+       pchan->timeout = 10000000;
 
        INIT_LIST_HEAD(&pchan->active);
        INIT_LIST_HEAD(&pchan->done);
@@ -327,6 +328,44 @@ int mxs_dma_release(int channel)
        return 0;
 }
 
+/*
+ * Set the timeout for any DMA operation started with mxs_dma_go()
+ * The timeout value given is in milliseconds
+ */
+int mxs_dma_set_timeout(int channel, unsigned long timeout)
+{
+       int ret;
+       struct mxs_dma_chan *pchan;
+
+       ret = mxs_dma_validate_chan(channel);
+       if (ret)
+               return ret;
+
+       pchan = &mxs_dma_channels[channel];
+
+       if (pchan->flags & MXS_DMA_FLAGS_BUSY)
+               return -EBUSY;
+
+       if (timeout > ~0UL / 1000)
+               return -EINVAL;
+
+       pchan->timeout = timeout;
+       return 0;
+}
+
+unsigned long mxs_dma_get_timeout(int channel)
+{
+       int ret;
+       struct mxs_dma_chan *pchan;
+
+       ret = mxs_dma_validate_chan(channel);
+       if (ret)
+               return 0;
+
+       pchan = &mxs_dma_channels[channel];
+       return pchan->timeout;
+}
+
 /*
  * Allocate DMA descriptor
  */
@@ -513,16 +552,25 @@ static int mxs_dma_wait_complete(uint32_t timeout, unsigned int chan)
  */
 int mxs_dma_go(int chan)
 {
-       uint32_t timeout = 10000;
        int ret;
-
+       struct mxs_dma_chan *pchan;
        LIST_HEAD(tmp_desc_list);
 
+       ret = mxs_dma_validate_chan(chan);
+       if (ret)
+               return ret;
+
+       pchan = &mxs_dma_channels[chan];
+
        mxs_dma_enable_irq(chan, 1);
-       mxs_dma_enable(chan);
+       ret = mxs_dma_enable(chan);
+       if (ret) {
+               mxs_dma_enable_irq(chan, 0);
+               return ret;
+       }
 
        /* Wait for DMA to finish. */
-       ret = mxs_dma_wait_complete(timeout, chan);
+       ret = mxs_dma_wait_complete(pchan->timeout * 1000, chan);
 
        /* Clear out the descriptors we just ran. */
        mxs_dma_finish(chan, &tmp_desc_list);