clocksource: samsung_pwm_timer: Do not use clocksource_mmio

In case of Samsung PWM timer, clocksource MMIO can not be used, because
custom suspend/resume callbacks are required.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Reviewed-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Mark Brown <broonie@linaro.org>
Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

2 files changed, 15 insertions, 5 deletions

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index b7b9b040a89b..41c69469ce20 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -99,7 +99,6 @@ config CLKSRC_EXYNOS_MCT
 
 config CLKSRC_SAMSUNG_PWM
         bool
-        select CLKSRC_MMIO
         help
           This is a new clocksource driver for the PWM timer found in
           Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
diff --git a/drivers/clocksource/samsung_pwm_timer.c b/drivers/clocksource/samsung_pwm_timer.c
index 0c005f4fa296..b3112dc293ba 100644
--- a/drivers/clocksource/samsung_pwm_timer.c
+++ b/drivers/clocksource/samsung_pwm_timer.c
@@ -298,6 +298,18 @@ static void __init samsung_clockevent_init(void)
         }
 }
 
+static cycle_t samsung_clocksource_read(struct clocksource *c)
+{
+        return ~readl_relaxed(pwm.source_reg);
+}
+
+static struct clocksource samsung_clocksource = {
+        .name           = "samsung_clocksource_timer",
+        .rating         = 250,
+        .read           = samsung_clocksource_read,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
 /*
  * Override the global weak sched_clock symbol with this
  * local implementation which uses the clocksource to get some
@@ -307,7 +319,7 @@ static void __init samsung_clockevent_init(void)
  */
 static u32 notrace samsung_read_sched_clock(void)
 {
-        return ~__raw_readl(pwm.source_reg);
+        return samsung_clocksource_read(NULL);
 }
 
 static void __init samsung_clocksource_init(void)
@@ -334,9 +346,8 @@ static void __init samsung_clocksource_init(void)
         setup_sched_clock(samsung_read_sched_clock,
                                                 pwm.variant.bits, clock_rate);
 
-        ret = clocksource_mmio_init(pwm.source_reg, "samsung_clocksource_timer",
-                                        clock_rate, 250, pwm.variant.bits,
-                                        clocksource_mmio_readl_down);
+        samsung_clocksource.mask = CLOCKSOURCE_MASK(pwm.variant.bits);
+        ret = clocksource_register_hz(&samsung_clocksource, clock_rate);
         if (ret)
                 panic("samsung_clocksource_timer: can't register clocksource\n");
 }