ARM: S3C24XX: add get_rate for clk_p on S3C2416/2443

Currently the rate of clk_p is calculated once and set through the
s3c24xx_setup_clocks call. As the clk_p is a child of clk_h we can
evaluate its divider and calculate the rate in get_rate.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

1 files changed, 24 insertions, 4 deletions

diff --git a/arch/arm/mach-s3c24xx/common-s3c2443.c b/arch/arm/mach-s3c24xx/common-s3c2443.c
index 5e863bff5c7f..46795db2af41 100644
--- a/arch/arm/mach-s3c24xx/common-s3c2443.c
+++ b/arch/arm/mach-s3c24xx/common-s3c2443.c
@@ -187,6 +187,25 @@ static struct clk_ops clk_h_ops = {
         .get_rate       = s3c2443_hclkdiv_getrate,
 };
 
+/* pclk divider
+ *
+ * divides the hclk and provides the pclk.
+ */
+
+static unsigned long s3c2443_pclkdiv_getrate(struct clk *clk)
+{
+        unsigned long rate = clk_get_rate(clk->parent);
+        unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
+
+        clkdiv0 = ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 1 : 0);
+
+        return rate / (clkdiv0 + 1);
+}
+
+static struct clk_ops clk_p_ops = {
+        .get_rate       = s3c2443_pclkdiv_getrate,
+};
+
 /* armdiv
  *
  * this clock is sourced from msysclk and can have a number of
@@ -549,7 +568,6 @@ void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll)
 {
         unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
         unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
-        unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
         struct clk *xtal_clk;
         unsigned long xtal;
         unsigned long pll;
@@ -567,7 +585,7 @@ void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll)
 
         fclk = clk_get_rate(&clk_armdiv);
         hclk = clk_get_rate(&clk_h);
-        pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1);
+        pclk = clk_get_rate(&clk_p);
 
         s3c24xx_setup_clocks(fclk, hclk, pclk);
 
@@ -630,11 +648,13 @@ void __init s3c2443_common_init_clocks(int xtal, pll_fn get_mpll,
         nr_armdiv = nr_divs;
         armdivmask = divmask;
 
-        /* s3c2443 parents h and p clocks from prediv */
+        /* s3c2443 parents h clock from prediv */
         clk_h.parent = &clk_prediv;
         clk_h.ops = &clk_h_ops;
 
-        clk_p.parent = &clk_prediv;
+        /* and p clock from h clock */
+        clk_p.parent = &clk_h;
+        clk_p.ops = &clk_p_ops;
 
         clk_usb_bus.parent = &clk_usb_bus_host.clk;
         clk_epll.parent = &clk_epllref.clk;