1 files changed, 51 insertions, 31 deletions

diff --git a/arch/arm/common/timer-sp.c b/arch/arm/common/timer-sp.c
index 6ef3342153b9..41df47875122 100644
--- a/arch/arm/common/timer-sp.c
+++ b/arch/arm/common/timer-sp.c
@@ -18,53 +18,67 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
+#include <linux/clk.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
+#include <linux/err.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 
 #include <asm/hardware/arm_timer.h>
 
-/*
- * These timers are currently always setup to be clocked at 1MHz.
- */
-#define TIMER_FREQ_KHZ  (1000)
-#define TIMER_RELOAD    (TIMER_FREQ_KHZ * 1000 / HZ)
+static long __init sp804_get_clock_rate(const char *name)
+{
+        struct clk *clk;
+        long rate;
+        int err;
+
+        clk = clk_get_sys("sp804", name);
+        if (IS_ERR(clk)) {
+                pr_err("sp804: %s clock not found: %d\n", name,
+                        (int)PTR_ERR(clk));
+                return PTR_ERR(clk);
+        }
 
-static void __iomem *clksrc_base;
+        err = clk_enable(clk);
+        if (err) {
+                pr_err("sp804: %s clock failed to enable: %d\n", name, err);
+                clk_put(clk);
+                return err;
+        }
 
-static cycle_t sp804_read(struct clocksource *cs)
-{
-        return ~readl(clksrc_base + TIMER_VALUE);
-}
+        rate = clk_get_rate(clk);
+        if (rate < 0) {
+                pr_err("sp804: %s clock failed to get rate: %ld\n", name, rate);
+                clk_disable(clk);
+                clk_put(clk);
+        }
 
-static struct clocksource clocksource_sp804 = {
-        .name           = "timer3",
-        .rating         = 200,
-        .read           = sp804_read,
-        .mask           = CLOCKSOURCE_MASK(32),
-        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
-};
+        return rate;
+}
 
-void __init sp804_clocksource_init(void __iomem *base)
+void __init sp804_clocksource_init(void __iomem *base, const char *name)
 {
-        struct clocksource *cs = &clocksource_sp804;
+        long rate = sp804_get_clock_rate(name);
 
-        clksrc_base = base;
+        if (rate < 0)
+                return;
 
         /* setup timer 0 as free-running clocksource */
-        writel(0, clksrc_base + TIMER_CTRL);
-        writel(0xffffffff, clksrc_base + TIMER_LOAD);
-        writel(0xffffffff, clksrc_base + TIMER_VALUE);
+        writel(0, base + TIMER_CTRL);
+        writel(0xffffffff, base + TIMER_LOAD);
+        writel(0xffffffff, base + TIMER_VALUE);
         writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
-                clksrc_base + TIMER_CTRL);
+                base + TIMER_CTRL);
 
-        clocksource_register_khz(cs, TIMER_FREQ_KHZ);
+        clocksource_mmio_init(base + TIMER_VALUE, name,
+                rate, 200, 32, clocksource_mmio_readl_down);
 }
 
 
 static void __iomem *clkevt_base;
+static unsigned long clkevt_reload;
 
 /*
  * IRQ handler for the timer
@@ -90,7 +104,7 @@ static void sp804_set_mode(enum clock_event_mode mode,
 
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
-                writel(TIMER_RELOAD, clkevt_base + TIMER_LOAD);
+                writel(clkevt_reload, clkevt_base + TIMER_LOAD);
                 ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
                 break;
 
@@ -120,7 +134,6 @@ static int sp804_set_next_event(unsigned long next,
 }
 
 static struct clock_event_device sp804_clockevent = {
-        .name           = "timer0",
         .shift          = 32,
         .features       = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
         .set_mode       = sp804_set_mode,
@@ -136,17 +149,24 @@ static struct irqaction sp804_timer_irq = {
         .dev_id         = &sp804_clockevent,
 };
 
-void __init sp804_clockevents_init(void __iomem *base, unsigned int timer_irq)
+void __init sp804_clockevents_init(void __iomem *base, unsigned int irq,
+        const char *name)
 {
         struct clock_event_device *evt = &sp804_clockevent;
+        long rate = sp804_get_clock_rate(name);
+
+        if (rate < 0)
+                return;
 
         clkevt_base = base;
+        clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
 
-        evt->irq = timer_irq;
-        evt->mult = div_sc(TIMER_FREQ_KHZ, NSEC_PER_MSEC, evt->shift);
+        evt->name = name;
+        evt->irq = irq;
+        evt->mult = div_sc(rate, NSEC_PER_SEC, evt->shift);
         evt->max_delta_ns = clockevent_delta2ns(0xffffffff, evt);
         evt->min_delta_ns = clockevent_delta2ns(0xf, evt);
 
-        setup_irq(timer_irq, &sp804_timer_irq);
+        setup_irq(irq, &sp804_timer_irq);
         clockevents_register_device(evt);
 }