[ARM] 3360/1: S3C2440 - add set rate methods and camera clock

Patch from Ben Dooks

Add set_rate methods for the extra clocks on the S3C2440
and add the camera UPLL clock source

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 51 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c2410/s3c2440-clock.c b/arch/arm/mach-s3c2410/s3c2440-clock.c
index 2d0fa03a257a..7bca0be87384 100644
--- a/arch/arm/mach-s3c2410/s3c2440-clock.c
+++ b/arch/arm/mach-s3c2410/s3c2440-clock.c
@@ -45,6 +45,48 @@
 
 /* S3C2440 extended clock support */
 
+static unsigned long s3c2440_camif_upll_round(struct clk *clk,
+                                              unsigned long rate)
+{
+        unsigned long parent_rate = clk_get_rate(clk->parent);
+        int div;
+
+        if (rate > parent_rate)
+                return parent_rate;
+
+        /* note, we remove the +/- 1 calculations for the divisor */
+
+        div = (parent_rate / rate) / 2;
+
+        if (div < 1)
+                div = 1;
+        else if (div > 16)
+                div = 16;
+
+        return parent_rate / (div * 2);
+}
+
+static int s3c2440_camif_upll_setrate(struct clk *clk, unsigned long rate)
+{
+        unsigned long parent_rate = clk_get_rate(clk->parent);
+        unsigned long camdivn =  __raw_readl(S3C2440_CAMDIVN);
+
+        rate = s3c2440_camif_upll_round(clk, rate);
+
+        camdivn &= ~(S3C2440_CAMDIVN_CAMCLK_SEL | S3C2440_CAMDIVN_CAMCLK_MASK);
+
+        if (rate != parent_rate) {
+                camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL;
+                camdivn |= (((parent_rate / rate) / 2) - 1);
+        }
+
+        __raw_writel(camdivn, S3C2440_CAMDIVN);
+
+        return 0;
+}
+
+/* Extra S3C2440 clocks */
+
 static struct clk s3c2440_clk_cam = {
         .name           = "camif",
         .id             = -1,
@@ -52,6 +94,13 @@ static struct clk s3c2440_clk_cam = {
         .ctrlbit        = S3C2440_CLKCON_CAMERA,
 };
 
+static struct clk s3c2440_clk_cam_upll = {
+        .name           = "camif-upll",
+        .id             = -1,
+        .set_rate       = s3c2440_camif_upll_setrate,
+        .round_rate     = s3c2440_camif_upll_round,
+};
+
 static struct clk s3c2440_clk_ac97 = {
         .name           = "ac97",
         .id             = -1,
@@ -78,9 +127,11 @@ static int s3c2440_clk_add(struct sys_device *sysdev)
 
         s3c2440_clk_cam.parent = clk_h;
         s3c2440_clk_ac97.parent = clk_p;
+        s3c2440_clk_cam_upll.parent = clk_upll;
 
         s3c24xx_register_clock(&s3c2440_clk_ac97);
         s3c24xx_register_clock(&s3c2440_clk_cam);
+        s3c24xx_register_clock(&s3c2440_clk_cam_upll);
 
         clk_disable(&s3c2440_clk_ac97);
         clk_disable(&s3c2440_clk_cam);