[ARM] S3C2443: Add armdiv and arm clocks

Add the armdiv and arm clocks to the S3C2443 clock
framework and ensure they are correctly setup.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

1 files changed, 53 insertions, 1 deletions

diff --git a/arch/arm/mach-s3c2443/clock.c b/arch/arm/mach-s3c2443/clock.c
index 24da92417a16..d34f3d32eba5 100644
--- a/arch/arm/mach-s3c2443/clock.c
+++ b/arch/arm/mach-s3c2443/clock.c
@@ -221,7 +221,6 @@ static struct clk clk_mdivclk = {
         .get_rate       = s3c2443_getrate_mdivclk,
 };
 
-
 static int s3c2443_setparent_msysclk(struct clk *clk, struct clk *parent)
 {
         unsigned long clksrc = __raw_readl(S3C2443_CLKSRC);
@@ -249,6 +248,46 @@ static struct clk clk_msysclk = {
         .set_parent     = s3c2443_setparent_msysclk,
 };
 
+/* armdiv
+ *
+ * this clock is sourced from msysclk and can have a number of
+ * divider values applied to it to then be fed into armclk.
+*/
+
+static struct clk clk_armdiv = {
+        .name           = "armdiv",
+        .id             = -1,
+        .parent         = &clk_msysclk,
+};
+
+/* armclk
+ *
+ * this is the clock fed into the ARM core itself, either from
+ * armdiv or from hclk.
+ */
+
+static int s3c2443_setparent_armclk(struct clk *clk, struct clk *parent)
+{
+        unsigned long clkdiv0;
+
+        clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
+
+        if (parent == &clk_armdiv)
+                clkdiv0 &= ~S3C2443_CLKDIV0_DVS;
+        else if (parent == &clk_h)
+                clkdiv0 |= S3C2443_CLKDIV0_DVS;
+        else
+                return -EINVAL;
+
+        __raw_writel(clkdiv0, S3C2443_CLKDIV0);
+        return 0;
+}
+
+static struct clk clk_arm = {
+        .name           = "armclk",
+        .id             = -1,
+        .set_parent     = s3c2443_setparent_armclk,
+};
 
 /* esysclk
  *
@@ -887,6 +926,15 @@ static void __init s3c2443_clk_initparents(void)
         }
 
         clk_init_set_parent(&clk_msysclk, parent);
+
+        /* arm */
+
+        if (__raw_readl(S3C2443_CLKDIV0) & S3C2443_CLKDIV0_DVS)
+                parent = &clk_h;
+        else
+                parent = &clk_armdiv;
+
+        clk_init_set_parent(&clk_arm, parent);
 }
 
 /* armdiv divisor table */
@@ -936,6 +984,8 @@ static struct clk *clks[] __initdata = {
         &clk_hsspi,
         &clk_hsmmc_div,
         &clk_hsmmc,
+        &clk_armdiv,
+        &clk_arm,
 };
 
 void __init s3c2443_init_clocks(int xtal)
@@ -958,6 +1008,8 @@ void __init s3c2443_init_clocks(int xtal)
         hclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_HCLK) ? 2 : 1);
         pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1);
 
+        clk_armdiv.rate = fclk;
+
         s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
 
         printk("S3C2443: mpll %s %ld.%03ld MHz, cpu %ld.%03ld MHz, mem %ld.%03ld MHz, pclk %ld.%03ld MHz\n",