1 files changed, 45 insertions, 21 deletions

diff --git a/arch/arm/plat-s3c/time.c b/arch/arm/plat-s3c/time.c
index a581ff7ba664..3b27b29da478 100644
--- a/arch/arm/plat-s3c/time.c
+++ b/arch/arm/plat-s3c/time.c
@@ -26,6 +26,7 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/platform_device.h>
 
 #include <asm/system.h>
 #include <asm/leds.h>
@@ -147,6 +148,10 @@ static struct irqaction s3c2410_timer_irq = {
         machine_is_anubis()     || \
         machine_is_osiris())
 
+static struct clk *tin;
+static struct clk *tdiv;
+static struct clk *timerclk;
+
 /*
  * Set up timer interrupt, and return the current time in seconds.
  *
@@ -162,12 +167,6 @@ static void s3c2410_timer_setup (void)
 
         tcnt = TICK_MAX;  /* default value for tcnt */
 
-        /* read the current timer configuration bits */
-
-        tcon = __raw_readl(S3C2410_TCON);
-        tcfg1 = __raw_readl(S3C2410_TCFG1);
-        tcfg0 = __raw_readl(S3C2410_TCFG0);
-
         /* configure the system for whichever machine is in use */
 
         if (use_tclk1_12()) {
@@ -175,11 +174,13 @@ static void s3c2410_timer_setup (void)
                 timer_usec_ticks = timer_mask_usec_ticks(1, 12000000);
                 tcnt = 12000000 / HZ;
 
+                tcfg1 = __raw_readl(S3C2410_TCFG1);
                 tcfg1 &= ~S3C2410_TCFG1_MUX4_MASK;
                 tcfg1 |= S3C2410_TCFG1_MUX4_TCLK1;
+                __raw_writel(tcfg1, S3C2410_TCFG1);
         } else {
                 unsigned long pclk;
-                struct clk *clk;
+                struct clk *tscaler;
 
                 /* for the h1940 (and others), we use the pclk from the core
                  * to generate the timer values. since values around 50 to
@@ -190,29 +191,25 @@ static void s3c2410_timer_setup (void)
                  * (8.45 ticks per usec)
                  */
 
-                /* this is used as default if no other timer can be found */
-
-                clk = clk_get(NULL, "timers");
-                if (IS_ERR(clk))
-                        panic("failed to get clock for system timer");
-
-                clk_enable(clk);
-
-                pclk = clk_get_rate(clk);
+                pclk = clk_get_rate(timerclk);
 
                 /* configure clock tick */
 
                 timer_usec_ticks = timer_mask_usec_ticks(6, pclk);
 
-                tcfg1 &= ~S3C2410_TCFG1_MUX4_MASK;
-                tcfg1 |= S3C2410_TCFG1_MUX4_DIV2;
+                tscaler = clk_get_parent(tdiv);
 
-                tcfg0 &= ~S3C2410_TCFG_PRESCALER1_MASK;
-                tcfg0 |= ((6 - 1) / 2) << S3C2410_TCFG_PRESCALER1_SHIFT;
+                clk_set_rate(tscaler, pclk / 3);
+                clk_set_rate(tdiv, pclk / 6);
+                clk_set_parent(tin, tdiv);
 
-                tcnt = (pclk / 6) / HZ;
+                tcnt = clk_get_rate(tin) / HZ;
         }
 
+        tcon = __raw_readl(S3C2410_TCON);
+        tcfg0 = __raw_readl(S3C2410_TCFG0);
+        tcfg1 = __raw_readl(S3C2410_TCFG1);
+
         /* timers reload after counting zero, so reduce the count by 1 */
 
         tcnt--;
@@ -248,8 +245,35 @@ static void s3c2410_timer_setup (void)
         __raw_writel(tcon, S3C2410_TCON);
 }
 
+static void __init s3c2410_timer_resources(void)
+{
+        struct platform_device tmpdev;
+
+        tmpdev.dev.bus = &platform_bus_type;
+        tmpdev.id = 4;
+
+        timerclk = clk_get(NULL, "timers");
+        if (IS_ERR(timerclk))
+                panic("failed to get clock for system timer");
+
+        clk_enable(timerclk);
+
+        if (!use_tclk1_12()) {
+                tin = clk_get(&tmpdev.dev, "pwm-tin");
+                if (IS_ERR(tin))
+                        panic("failed to get pwm-tin clock for system timer");
+
+                tdiv = clk_get(&tmpdev.dev, "pwm-tdiv");
+                if (IS_ERR(tdiv))
+                        panic("failed to get pwm-tdiv clock for system timer");
+        }
+
+        clk_enable(tin);
+}
+
 static void __init s3c2410_timer_init(void)
 {
+        s3c2410_timer_resources();
         s3c2410_timer_setup();
         setup_irq(IRQ_TIMER4, &s3c2410_timer_irq);
 }