[PATCH 13/13] clocksource: convert OMAP1 to 32-bit down counting clocksource

Russell King - ARM Linux
2011-05-10T07:34:38Z

Convert the OMAP1 32-bit down counting clocksource to the generic
clocksource infrastructure.

Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
arch/arm/mach-omap1/time.c | 23 ++++++-----------------
arch/arm/plat-omap/Kconfig | 1 +
2 files changed, 7 insertions(+), 17 deletions(-)

diff --git a/arch/arm/mach-omap1/time.c b/arch/arm/mach-omap1/time.c
index e7ab616..03e1e10 100644
--- a/arch/arm/mach-omap1/time.c
+++ b/arch/arm/mach-omap1/time.c
@@ -190,24 +190,11 @@ static __init void omap_init_mpu_timer(unsigned long rate)
* ---------------------------------------------------------------------------
*/

-static cycle_t mpu_read(struct clocksource *cs)
-{
- return ~omap_mpu_timer_read(1);
-}
-
-static struct clocksource clocksource_mpu = {
- .name = "mpu_timer2",
- .rating = 300,
- .read = mpu_read,
- .mask = CLOCKSOURCE_MASK(32),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
-};
-
static DEFINE_CLOCK_DATA(cd);

static inline unsigned long long notrace _omap_mpu_sched_clock(void)
{
- u32 cyc = mpu_read(&clocksource_mpu);
+ u32 cyc = ~omap_mpu_timer_read(1);
return cyc_to_sched_clock(&cd, cyc, (u32)~0);
}

@@ -225,20 +212,22 @@ static unsigned long long notrace omap_mpu_sched_clock(void)

static void notrace mpu_update_sched_clock(void)
{
- u32 cyc = mpu_read(&clocksource_mpu);
+ u32 cyc = ~omap_mpu_timer_read(1);
update_sched_clock(&cd, cyc, (u32)~0);
}

static void __init omap_init_clocksource(unsigned long rate)
{
+ omap_mpu_timer_regs_t __iomem *timer = omap_mpu_timer_base(1);
static char err[] __initdata = KERN_ERR
"%s: can't register clocksource!\n";

omap_mpu_timer_start(1, ~0, 1);
init_sched_clock(&cd, mpu_update_sched_clock, 32, rate);

- if (clocksource_register_hz(&clocksource_mpu, rate))
- printk(err, clocksource_mpu.name);
+ if (clocksource_mmio_init(&timer->read_tim, "mpu_timer2", rate,
+ 300, 32, clocksource_mmio_readl_down))
+ printk(err, "mpu_timer2");
}

static void __init omap_mpu_timer_init(void)
diff --git a/arch/arm/plat-omap/Kconfig b/arch/arm/plat-omap/Kconfig
index cd5f993..e9c0efc 100644
--- a/arch/arm/plat-omap/Kconfig
+++ b/arch/arm/plat-omap/Kconfig
@@ -12,6 +12,7 @@ choice
config ARCH_OMAP1
bool "TI OMAP1"
select CLKDEV_LOOKUP
+ select CLKSRC_MMIO
help
"Systems based on omap7xx, omap15xx or omap16xx"

--
1.7.4.4