diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c index 8629a5fd5f81..9e3027114f59 100644 --- a/drivers/dma/mxs-dma.c +++ b/drivers/dma/mxs-dma.c @@ -26,6 +26,7 @@ #include #include #include +#include #include @@ -121,6 +122,7 @@ struct mxs_dma_chan { enum dma_status status; unsigned int flags; bool reset; + struct dma_pool *ccw_pool; #define MXS_DMA_SG_LOOP (1 << 0) #define MXS_DMA_USE_SEMAPHORE (1 << 1) }; @@ -422,9 +424,10 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) struct device *dev = &mxs_dma->pdev->dev; int ret; - mxs_chan->ccw = dma_alloc_coherent(mxs_dma->dma_device.dev, - CCW_BLOCK_SIZE, - &mxs_chan->ccw_phys, GFP_KERNEL); + mxs_chan->ccw = dma_pool_zalloc(mxs_chan->ccw_pool, + GFP_ATOMIC, + &mxs_chan->ccw_phys); + if (!mxs_chan->ccw) { ret = -ENOMEM; goto err_alloc; @@ -454,8 +457,8 @@ static int mxs_dma_alloc_chan_resources(struct dma_chan *chan) err_clk: free_irq(mxs_chan->chan_irq, mxs_dma); err_irq: - dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, - mxs_chan->ccw, mxs_chan->ccw_phys); + dma_pool_free(mxs_chan->ccw_pool, mxs_chan->ccw, + mxs_chan->ccw_phys); err_alloc: return ret; } @@ -470,8 +473,8 @@ static void mxs_dma_free_chan_resources(struct dma_chan *chan) free_irq(mxs_chan->chan_irq, mxs_dma); - dma_free_coherent(mxs_dma->dma_device.dev, CCW_BLOCK_SIZE, - mxs_chan->ccw, mxs_chan->ccw_phys); + dma_pool_free(mxs_chan->ccw_pool, mxs_chan->ccw, + mxs_chan->ccw_phys); pm_runtime_mark_last_busy(dev); pm_runtime_put_autosuspend(dev); @@ -802,6 +805,7 @@ static int mxs_dma_probe(struct platform_device *pdev) const struct mxs_dma_type *dma_type; struct mxs_dma_engine *mxs_dma; struct resource *iores; + struct dma_pool *ccw_pool; int ret, i; mxs_dma = devm_kzalloc(&pdev->dev, sizeof(*mxs_dma), GFP_KERNEL); @@ -849,7 +853,6 @@ static int mxs_dma_probe(struct platform_device *pdev) tasklet_init(&mxs_chan->tasklet, mxs_dma_tasklet, (unsigned long) mxs_chan); - /* Add the channel to mxs_chan list */ list_add_tail(&mxs_chan->chan.device_node, &mxs_dma->dma_device.channels); @@ -864,6 +867,17 @@ static int mxs_dma_probe(struct platform_device *pdev) mxs_dma->dma_device.dev = &pdev->dev; + /* create the dma pool */ + ccw_pool = dma_pool_create("ccw_pool", + mxs_dma->dma_device.dev, + CCW_BLOCK_SIZE, 32, 0); + + for (i = 0; i < MXS_DMA_CHANNELS; i++) { + struct mxs_dma_chan *mxs_chan = &mxs_dma->mxs_chans[i]; + + mxs_chan->ccw_pool = ccw_pool; + } + /* mxs_dma gets 65535 bytes maximum sg size */ mxs_dma->dma_device.dev->dma_parms = &mxs_dma->dma_parms; dma_set_max_seg_size(mxs_dma->dma_device.dev, MAX_XFER_BYTES);