omap1: Fix sched_clock implementation when both MPU timer and 32K timer are used

[mv-sheeva.git] / arch / arm / mach-omap1 / time.c

diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index a39a15e4f3f9cf91f843800721054d267b16c924..f83fc335c613db6e3ac14e7fcf2cf15cd6af5a45 100644 (file)
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -57,6 +57,8 @@
 
 #include <plat/common.h>
 
+#ifdef CONFIG_OMAP_MPU_TIMER
+
 #define OMAP_MPU_TIMER_BASE            OMAP_MPU_TIMER1_BASE
 #define OMAP_MPU_TIMER_OFFSET          0x100
 
@@ -217,6 +219,24 @@ static struct clocksource clocksource_mpu = {
 
 static DEFINE_CLOCK_DATA(cd);
 
+static inline unsigned long long notrace _omap_mpu_sched_clock(void)
+{
+       u32 cyc = mpu_read(&clocksource_mpu);
+       return cyc_to_sched_clock(&cd, cyc, (u32)~0);
+}
+
+#ifndef CONFIG_OMAP_32K_TIMER
+unsigned long long notrace sched_clock(void)
+{
+       return _omap_mpu_sched_clock();
+}
+#else
+static unsigned long long notrace omap_mpu_sched_clock(void)
+{
+       return _omap_mpu_sched_clock();
+}
+#endif
+
 static void notrace mpu_update_sched_clock(void)
 {
        u32 cyc = mpu_read(&clocksource_mpu);
@@ -236,12 +256,7 @@ static void __init omap_init_clocksource(unsigned long rate)
                printk(err, clocksource_mpu.name);
 }
 
-/*
- * ---------------------------------------------------------------------------
- * Timer initialization
- * ---------------------------------------------------------------------------
- */
-static void __init omap_timer_init(void)
+static void __init omap_mpu_timer_init(void)
 {
        struct clk      *ck_ref = clk_get(NULL, "ck_ref");
        unsigned long   rate;
@@ -256,13 +271,66 @@ static void __init omap_timer_init(void)
 
        omap_init_mpu_timer(rate);
        omap_init_clocksource(rate);
-       /*
-        * XXX Since this file seems to deal mostly with the MPU timer,
-        * this doesn't seem like the correct place for the sync timer
-        * clocksource init.
-        */
-       if (!cpu_is_omap7xx() && !cpu_is_omap15xx())
-               omap_init_clocksource_32k();
+}
+
+#else
+static inline void omap_mpu_timer_init(void)
+{
+       pr_err("Bogus timer, should not happen\n");
+}
+#endif /* CONFIG_OMAP_MPU_TIMER */
+
+#if defined(CONFIG_OMAP_MPU_TIMER) && defined(CONFIG_OMAP_32K_TIMER)
+static unsigned long long (*preferred_sched_clock)(void);
+
+unsigned long long notrace sched_clock(void)
+{
+       if (!preferred_sched_clock)
+               return 0;
+
+       return preferred_sched_clock();
+}
+
+static inline void preferred_sched_clock_init(bool use_32k_sched_clock)
+{
+       if (use_32k_sched_clock)
+               preferred_sched_clock = omap_32k_sched_clock;
+       else
+               preferred_sched_clock = omap_mpu_sched_clock;
+}
+#else
+static inline void preferred_sched_clock_init(bool use_32k_sched_clcok)
+{
+}
+#endif
+
+static inline int omap_32k_timer_usable(void)
+{
+       int res = false;
+
+       if (cpu_is_omap730() || cpu_is_omap15xx())
+               return res;
+
+#ifdef CONFIG_OMAP_32K_TIMER
+       res = omap_32k_timer_init();
+#endif
+
+       return res;
+}
+
+/*
+ * ---------------------------------------------------------------------------
+ * Timer initialization
+ * ---------------------------------------------------------------------------
+ */
+static void __init omap_timer_init(void)
+{
+       if (omap_32k_timer_usable()) {
+               preferred_sched_clock_init(1);
+       } else {
+               omap_mpu_timer_init();
+               preferred_sched_clock_init(0);
+       }
 }
 
 struct sys_timer omap_timer = {