Pull novell-bugzilla-156426 into release branch

[pandora-kernel.git] / arch / arm / mach-s3c2410 / s3c2440-clock.c

diff --git a/arch/arm/mach-s3c2410/s3c2440-clock.c b/arch/arm/mach-s3c2410/s3c2440-clock.c
index b557a2b..d7a30ed 100644 (file)
--- a/arch/arm/mach-s3c2410/s3c2440-clock.c
+++ b/arch/arm/mach-s3c2410/s3c2440-clock.c
@@ -31,6 +31,7 @@
 #include <linux/sysdev.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
+#include <linux/mutex.h>
 #include <linux/clk.h>
 
 #include <asm/hardware.h>
@@ -45,10 +46,47 @@
 
 /* S3C2440 extended clock support */
 
-static struct clk s3c2440_clk_upll = {
-       .name           = "upll",
-       .id             = -1,
-};
+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",
@@ -57,6 +95,13 @@ 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,
@@ -66,38 +111,46 @@ static struct clk s3c2440_clk_ac97 = {
 
 static int s3c2440_clk_add(struct sys_device *sysdev)
 {
-       unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
        unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
+       unsigned long clkdivn;
        struct clk *clk_h;
        struct clk *clk_p;
-       struct clk *clk_xtal;
-
-       clk_xtal = clk_get(NULL, "xtal");
-       if (IS_ERR(clk_xtal)) {
-               printk(KERN_ERR "S3C2440: Failed to get clk_xtal\n");
-               return -EINVAL;
-       }
-
-       s3c2440_clk_upll.rate = s3c2410_get_pll(upllcon, clk_xtal->rate);
+       struct clk *clk_upll;
 
-       printk("S3C2440: Clock Support, UPLL %ld.%03ld MHz, DVS %s\n",
-              print_mhz(s3c2440_clk_upll.rate),
+       printk("S3C2440: Clock Support, DVS %s\n",
               (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
 
        clk_p = clk_get(NULL, "pclk");
        clk_h = clk_get(NULL, "hclk");
+       clk_upll = clk_get(NULL, "upll");
 
-       if (IS_ERR(clk_p) || IS_ERR(clk_h)) {
+       if (IS_ERR(clk_p) || IS_ERR(clk_h) || IS_ERR(clk_upll)) {
                printk(KERN_ERR "S3C2440: Failed to get parent clocks\n");
                return -EINVAL;
        }
 
+       /* check rate of UPLL, and if it is near 96MHz, then change
+        * to using half the UPLL rate for the system */
+
+       if (clk_get_rate(clk_upll) > (94 * MHZ)) {
+               clk_usb_bus.rate = clk_get_rate(clk_upll) / 2;
+
+               mutex_lock(&clocks_mutex);
+
+               clkdivn = __raw_readl(S3C2410_CLKDIVN);
+               clkdivn |= S3C2440_CLKDIVN_UCLK;
+               __raw_writel(clkdivn, S3C2410_CLKDIVN);
+
+               mutex_unlock(&clocks_mutex);
+       }
+
        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_upll);
+       s3c24xx_register_clock(&s3c2440_clk_cam_upll);
 
        clk_disable(&s3c2440_clk_ac97);
        clk_disable(&s3c2440_clk_cam);