ARM: SAMSUNG: Move DMA clock enable into S3C PL330 driver

This patch moves DMA clock enable functionality into pl330_probe() of
plat-samsung/s3c_pl330.c (PL330 DMAC driver) and disable functionality
into pl330_remove().
For now according to clock policy of Samsung SoCs' mainline, clocks which
are used in the driver should be controlled by each own.

Signed-off-by: Seungwhan Youn <sw.youn@samsung.com>
Acked-by: Jassi Brar <jassi.brar@samsung.com>
[kgene.kim@samsung.com: minor title and comment edit]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 27 insertions, 7 deletions

diff --git a/arch/arm/plat-samsung/s3c-pl330.c b/arch/arm/plat-samsung/s3c-pl330.c
index a91305a60ae..b4ff8d74ac4 100644
--- a/arch/arm/plat-samsung/s3c-pl330.c
+++ b/arch/arm/plat-samsung/s3c-pl330.c
@@ -15,6 +15,8 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 
 #include <asm/hardware/pl330.h>
 
@@ -27,6 +29,7 @@
  * @node: To attach to the global list of DMACs.
  * @pi: PL330 configuration info for the DMAC.
  * @kmcache: Pool to quickly allocate xfers for all channels in the dmac.
+ * @clk: Pointer of DMAC operation clock.
  */
 struct s3c_pl330_dmac {
         unsigned                busy_chan;
@@ -34,6 +37,7 @@ struct s3c_pl330_dmac {
         struct list_head        node;
         struct pl330_info       *pi;
         struct kmem_cache       *kmcache;
+        struct clk              *clk;
 };
 
 /**
@@ -1072,16 +1076,25 @@ static int pl330_probe(struct platform_device *pdev)
         if (ret)
                 goto probe_err4;
 
-        ret = pl330_add(pl330_info);
-        if (ret)
-                goto probe_err5;
-
         /* Allocate a new DMAC */
         s3c_pl330_dmac = kmalloc(sizeof(*s3c_pl330_dmac), GFP_KERNEL);
         if (!s3c_pl330_dmac) {
                 ret = -ENOMEM;
+                goto probe_err5;
+        }
+
+        /* Get operation clock and enable it */
+        s3c_pl330_dmac->clk = clk_get(&pdev->dev, "pdma");
+        if (IS_ERR(s3c_pl330_dmac->clk)) {
+                dev_err(&pdev->dev, "Cannot get operation clock.\n");
+                ret = -EINVAL;
                 goto probe_err6;
         }
+        clk_enable(s3c_pl330_dmac->clk);
+
+        ret = pl330_add(pl330_info);
+        if (ret)
+                goto probe_err7;
 
         /* Hook the info */
         s3c_pl330_dmac->pi = pl330_info;
@@ -1094,7 +1107,7 @@ static int pl330_probe(struct platform_device *pdev)
 
         if (!s3c_pl330_dmac->kmcache) {
                 ret = -ENOMEM;
-                goto probe_err7;
+                goto probe_err8;
         }
 
         /* Get the list of peripherals */
@@ -1120,10 +1133,13 @@ static int pl330_probe(struct platform_device *pdev)
 
         return 0;
 
+probe_err8:
+        pl330_del(pl330_info);
 probe_err7:
-        kfree(s3c_pl330_dmac);
+        clk_disable(s3c_pl330_dmac->clk);
+        clk_put(s3c_pl330_dmac->clk);
 probe_err6:
-        pl330_del(pl330_info);
+        kfree(s3c_pl330_dmac);
 probe_err5:
         free_irq(irq, pl330_info);
 probe_err4:
@@ -1188,6 +1204,10 @@ static int pl330_remove(struct platform_device *pdev)
                 }
         }
 
+        /* Disable operation clock */
+        clk_disable(dmac->clk);
+        clk_put(dmac->clk);
+
         /* Remove the DMAC */
         list_del(&dmac->node);
         kfree(dmac);