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authorMarc Zyngier <Marc.Zyngier@arm.com>2012-05-05 19:28:44 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-05-06 11:09:21 +0100
commitbd0493eaaf5c7a1ea00786d46cc2f4af44e76f28 (patch)
treebd7fbb1d21c5c00b0c37eeb3ac1b09a9d4f123ac
parentf67860a76f162ebcc6a2cacf3b0538d8a67d55ae (diff)
ARM: 7413/1: move read_{boot,persistent}_clock to the architecture level
At the moment, read_persistent_clock is implemented at the platform level, which makes it impossible to compile these platforms in a single kernel. Implement these two functions at the architecture level, and provide a thin registration interface for both read_boot_clock and read_persistent_clock. The two affected platforms (OMAP and Tegra) are converted at the same time. Reported-by: Jeff Ohlstein <johlstei@codeaurora.org> Tested-by: Stephen Warren <swarren@wwwdotorg.org> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/include/asm/mach/time.h5
-rw-r--r--arch/arm/kernel/time.c36
-rw-r--r--arch/arm/mach-tegra/timer.c5
-rw-r--r--arch/arm/plat-omap/counter_32k.c6
4 files changed, 48 insertions, 4 deletions
diff --git a/arch/arm/include/asm/mach/time.h b/arch/arm/include/asm/mach/time.h
index f73c908b7fa0..6ca945f534ab 100644
--- a/arch/arm/include/asm/mach/time.h
+++ b/arch/arm/include/asm/mach/time.h
@@ -42,4 +42,9 @@ struct sys_timer {
extern void timer_tick(void);
+struct timespec;
+typedef void (*clock_access_fn)(struct timespec *);
+extern int register_persistent_clock(clock_access_fn read_boot,
+ clock_access_fn read_persistent);
+
#endif
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index fe31b22f18fd..af2afb019672 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -110,6 +110,42 @@ void timer_tick(void)
}
#endif
+static void dummy_clock_access(struct timespec *ts)
+{
+ ts->tv_sec = 0;
+ ts->tv_nsec = 0;
+}
+
+static clock_access_fn __read_persistent_clock = dummy_clock_access;
+static clock_access_fn __read_boot_clock = dummy_clock_access;;
+
+void read_persistent_clock(struct timespec *ts)
+{
+ __read_persistent_clock(ts);
+}
+
+void read_boot_clock(struct timespec *ts)
+{
+ __read_boot_clock(ts);
+}
+
+int __init register_persistent_clock(clock_access_fn read_boot,
+ clock_access_fn read_persistent)
+{
+ /* Only allow the clockaccess functions to be registered once */
+ if (__read_persistent_clock == dummy_clock_access &&
+ __read_boot_clock == dummy_clock_access) {
+ if (read_boot)
+ __read_boot_clock = read_boot;
+ if (read_persistent)
+ __read_persistent_clock = read_persistent;
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
static int timer_suspend(void)
{
diff --git a/arch/arm/mach-tegra/timer.c b/arch/arm/mach-tegra/timer.c
index 1eed8d4a80ef..315672c7bd48 100644
--- a/arch/arm/mach-tegra/timer.c
+++ b/arch/arm/mach-tegra/timer.c
@@ -124,7 +124,7 @@ static u64 tegra_rtc_read_ms(void)
}
/*
- * read_persistent_clock - Return time from a persistent clock.
+ * tegra_read_persistent_clock - Return time from a persistent clock.
*
* Reads the time from a source which isn't disabled during PM, the
* 32k sync timer. Convert the cycles elapsed since last read into
@@ -133,7 +133,7 @@ static u64 tegra_rtc_read_ms(void)
* tegra_rtc driver could be executing to avoid race conditions
* on the RTC shadow register
*/
-void read_persistent_clock(struct timespec *ts)
+static void tegra_read_persistent_clock(struct timespec *ts)
{
u64 delta;
struct timespec *tsp = &persistent_ts;
@@ -243,6 +243,7 @@ static void __init tegra_init_timer(void)
tegra_clockevent.irq = tegra_timer_irq.irq;
clockevents_register_device(&tegra_clockevent);
tegra_twd_init();
+ register_persistent_clock(NULL, tegra_read_persistent_clock);
}
struct sys_timer tegra_timer = {
diff --git a/arch/arm/plat-omap/counter_32k.c b/arch/arm/plat-omap/counter_32k.c
index 5068fe5a6910..44ae077dbc28 100644
--- a/arch/arm/plat-omap/counter_32k.c
+++ b/arch/arm/plat-omap/counter_32k.c
@@ -19,6 +19,7 @@
#include <linux/io.h>
#include <linux/clocksource.h>
+#include <asm/mach/time.h>
#include <asm/sched_clock.h>
#include <plat/hardware.h>
@@ -43,7 +44,7 @@ static u32 notrace omap_32k_read_sched_clock(void)
}
/**
- * read_persistent_clock - Return time from a persistent clock.
+ * omap_read_persistent_clock - Return time from a persistent clock.
*
* Reads the time from a source which isn't disabled during PM, the
* 32k sync timer. Convert the cycles elapsed since last read into
@@ -52,7 +53,7 @@ static u32 notrace omap_32k_read_sched_clock(void)
static struct timespec persistent_ts;
static cycles_t cycles, last_cycles;
static unsigned int persistent_mult, persistent_shift;
-void read_persistent_clock(struct timespec *ts)
+static void omap_read_persistent_clock(struct timespec *ts)
{
unsigned long long nsecs;
cycles_t delta;
@@ -116,6 +117,7 @@ int __init omap_init_clocksource_32k(void)
printk(err, "32k_counter");
setup_sched_clock(omap_32k_read_sched_clock, 32, 32768);
+ register_persistent_clock(NULL, omap_read_persistent_clock);
}
return 0;
}