dma:mmp_tdma: get sram pool through device tree

    Support to get sram pool from generic device tree binding. The
existing way of get sram poll, directly call sram_get_gpool(), still
work here.

Signed-off-by: Nenghua Cao <nhcao@marvell.com>
Acked-by: Zhangfei Gao <zhangfei.gao@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
index d4b730ce03691abb6a90dc1bc7cf952f0e23a5fe..33f96aaa80c759aff2f8098e2135dd6f1b67b90a 100644 (file)
--- a/drivers/dma/mmp_tdma.c
+++ b/drivers/dma/mmp_tdma.c
@@ -126,6 +126,8 @@ struct mmp_tdma_chan {
        size_t                          buf_len;
        size_t                          period_len;
        size_t                          pos;
+
+       struct gen_pool                 *pool;
 };
 
 #define TDMA_CHANNEL_NUM 2
@@ -324,7 +326,7 @@ static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
        struct gen_pool *gpool;
        int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
 
-       gpool = sram_get_gpool("asram");
+       gpool = tdmac->pool;
        if (tdmac->desc_arr)
                gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
                                size);
@@ -374,7 +376,7 @@ struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac)
        struct gen_pool *gpool;
        int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
 
-       gpool = sram_get_gpool("asram");
+       gpool = tdmac->pool;
        if (!gpool)
                return NULL;
 
@@ -505,7 +507,8 @@ static int mmp_tdma_remove(struct platform_device *pdev)
 }
 
 static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
-                                               int idx, int irq, int type)
+                                       int idx, int irq,
+                                       int type, struct gen_pool *pool)
 {
        struct mmp_tdma_chan *tdmac;
 
@@ -527,6 +530,7 @@ static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
        tdmac->idx         = idx;
        tdmac->type        = type;
        tdmac->reg_base    = tdev->base + idx * 4;
+       tdmac->pool        = pool;
        tdmac->status = DMA_COMPLETE;
        tdev->tdmac[tdmac->idx] = tdmac;
        tasklet_init(&tdmac->tasklet, dma_do_tasklet, (unsigned long)tdmac);
@@ -553,6 +557,7 @@ static int mmp_tdma_probe(struct platform_device *pdev)
        int i, ret;
        int irq = 0, irq_num = 0;
        int chan_num = TDMA_CHANNEL_NUM;
+       struct gen_pool *pool;
 
        of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev);
        if (of_id)
@@ -579,6 +584,15 @@ static int mmp_tdma_probe(struct platform_device *pdev)
 
        INIT_LIST_HEAD(&tdev->device.channels);
 
+       if (pdev->dev.of_node)
+               pool = of_get_named_gen_pool(pdev->dev.of_node, "asram", 0);
+       else
+               pool = sram_get_gpool("asram");
+       if (!pool) {
+               dev_err(&pdev->dev, "asram pool not available\n");
+               return -ENOMEM;
+       }
+
        if (irq_num != chan_num) {
                irq = platform_get_irq(pdev, 0);
                ret = devm_request_irq(&pdev->dev, irq,
@@ -590,7 +604,7 @@ static int mmp_tdma_probe(struct platform_device *pdev)
        /* initialize channel parameters */
        for (i = 0; i < chan_num; i++) {
                irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i);
-               ret = mmp_tdma_chan_init(tdev, i, irq, type);
+               ret = mmp_tdma_chan_init(tdev, i, irq, type, pool);
                if (ret)
                        return ret;
        }