From ef89af1f4380b922bdadd31c9e49829a022f55ae Mon Sep 17 00:00:00 2001 From: Yanchang Li Date: Tue, 11 Nov 2014 20:42:52 +0800 Subject: clocksource: sirf: Remove hard-coded clock rate The customers may want to adjust the whole PLL and dividers according to different user scenerios, and this causes the parent clock of sirf clocksource not be divided exactly by the current hard-coded 1MHz clock rate. This patch removes the hard-coded rate and makes the clocksource driver more adaptive to the external changes. Signed-off-by: Yanchang Li Signed-off-by: Barry Song Signed-off-by: Daniel Lezcano --- drivers/clocksource/timer-marco.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-) (limited to 'drivers/clocksource') diff --git a/drivers/clocksource/timer-marco.c b/drivers/clocksource/timer-marco.c index caf7a2030461..361a789d4bee 100644 --- a/drivers/clocksource/timer-marco.c +++ b/drivers/clocksource/timer-marco.c @@ -20,8 +20,6 @@ #include #include -#define MARCO_CLOCK_FREQ 1000000 - #define SIRFSOC_TIMER_32COUNTER_0_CTRL 0x0000 #define SIRFSOC_TIMER_32COUNTER_1_CTRL 0x0004 #define SIRFSOC_TIMER_MATCH_0 0x0018 @@ -40,6 +38,8 @@ #define SIRFSOC_TIMER_REG_CNT 6 +static unsigned long marco_timer_rate; + static const u32 sirfsoc_timer_reg_list[SIRFSOC_TIMER_REG_CNT] = { SIRFSOC_TIMER_WATCHDOG_EN, SIRFSOC_TIMER_32COUNTER_0_CTRL, @@ -195,7 +195,7 @@ static int sirfsoc_local_timer_setup(struct clock_event_device *ce) ce->rating = 200; ce->set_mode = sirfsoc_timer_set_mode; ce->set_next_event = sirfsoc_timer_set_next_event; - clockevents_calc_mult_shift(ce, MARCO_CLOCK_FREQ, 60); + clockevents_calc_mult_shift(ce, marco_timer_rate, 60); ce->max_delta_ns = clockevent_delta2ns(-2, ce); ce->min_delta_ns = clockevent_delta2ns(2, ce); ce->cpumask = cpumask_of(cpu); @@ -257,7 +257,6 @@ static void __init sirfsoc_clockevent_init(void) /* initialize the kernel jiffy timer source */ static void __init sirfsoc_marco_timer_init(struct device_node *np) { - unsigned long rate; u32 timer_div; struct clk *clk; @@ -266,16 +265,12 @@ static void __init sirfsoc_marco_timer_init(struct device_node *np) BUG_ON(clk_prepare_enable(clk)); - rate = clk_get_rate(clk); - - BUG_ON(rate < MARCO_CLOCK_FREQ); - BUG_ON(rate % MARCO_CLOCK_FREQ); + marco_timer_rate = clk_get_rate(clk); - /* Initialize the timer dividers */ - timer_div = rate / MARCO_CLOCK_FREQ - 1; - writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL); - writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL); - writel_relaxed(timer_div << 16, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_1_CTRL); + /* timer dividers: 0, not divided */ + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_CTRL); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_0_CTRL); + writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_32COUNTER_1_CTRL); /* Initialize timer counters to 0 */ writel_relaxed(0, sirfsoc_timer_base + SIRFSOC_TIMER_64COUNTER_LOAD_LO); @@ -288,7 +283,7 @@ static void __init sirfsoc_marco_timer_init(struct device_node *np) /* Clear all interrupts */ writel_relaxed(0xFFFF, sirfsoc_timer_base + SIRFSOC_TIMER_INTR_STATUS); - BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, MARCO_CLOCK_FREQ)); + BUG_ON(clocksource_register_hz(&sirfsoc_clocksource, marco_timer_rate)); sirfsoc_clockevent_init(); } -- cgit v1.2.3 From 551f2fd5c6f34945e2daa3abb547f81f5576facb Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 4 Nov 2014 10:21:31 -0300 Subject: clocksource: armada-370-xp: Add missing clock enable This commit makes sure the timer clock is prepared and enabled before retrieving its rate. Acked-by: Jason Cooper Acked-by: Gregory CLEMENT Acked-by: Wim Van Sebroeck Reviewed-by: Thomas Petazzoni Tested-by: Thomas Petazzoni Signed-off-by: Ezequiel Garcia Signed-off-by: Daniel Lezcano --- drivers/clocksource/time-armada-370-xp.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/clocksource') diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c index 0451e62fac7a..d8555f9edc50 100644 --- a/drivers/clocksource/time-armada-370-xp.c +++ b/drivers/clocksource/time-armada-370-xp.c @@ -293,6 +293,7 @@ static void __init armada_xp_timer_init(struct device_node *np) /* The 25Mhz fixed clock is mandatory, and must always be available */ BUG_ON(IS_ERR(clk)); + clk_prepare_enable(clk); timer_clk = clk_get_rate(clk); armada_370_xp_timer_common_init(np); @@ -305,6 +306,7 @@ static void __init armada_370_timer_init(struct device_node *np) struct clk *clk = of_clk_get(np, 0); BUG_ON(IS_ERR(clk)); + clk_prepare_enable(clk); timer_clk = clk_get_rate(clk) / TIMER_DIVIDER; timer25Mhz = false; -- cgit v1.2.3 From 4a22d9c93af1f2b2c40354c4bc59fd007f33f05e Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Tue, 4 Nov 2014 10:21:33 -0300 Subject: clocksource: armada-370-xp: Use the reference clock on A375 SoC The 25 MHz reference clock has better stability so its use is preferred over the core clock. This commit takes advantage of the already introduced Armada 375 devicetree compatible string and adds a new timer initialization. If available, the timer will use the reference clock (named as 'fixed'). Otherwise, it falls back to the previous behavior. Acked-by: Jason Cooper Acked-by: Gregory CLEMENT Acked-by: Wim Van Sebroeck Reviewed-by: Thomas Petazzoni Tested-by: Thomas Petazzoni Signed-off-by: Ezequiel Garcia Signed-off-by: Daniel Lezcano --- drivers/clocksource/time-armada-370-xp.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'drivers/clocksource') diff --git a/drivers/clocksource/time-armada-370-xp.c b/drivers/clocksource/time-armada-370-xp.c index d8555f9edc50..3a0704b0d739 100644 --- a/drivers/clocksource/time-armada-370-xp.c +++ b/drivers/clocksource/time-armada-370-xp.c @@ -301,6 +301,34 @@ static void __init armada_xp_timer_init(struct device_node *np) CLOCKSOURCE_OF_DECLARE(armada_xp, "marvell,armada-xp-timer", armada_xp_timer_init); +static void __init armada_375_timer_init(struct device_node *np) +{ + struct clk *clk; + + clk = of_clk_get_by_name(np, "fixed"); + if (!IS_ERR(clk)) { + clk_prepare_enable(clk); + timer_clk = clk_get_rate(clk); + } else { + + /* + * This fallback is required in order to retain proper + * devicetree backwards compatibility. + */ + clk = of_clk_get(np, 0); + + /* Must have at least a clock */ + BUG_ON(IS_ERR(clk)); + clk_prepare_enable(clk); + timer_clk = clk_get_rate(clk) / TIMER_DIVIDER; + timer25Mhz = false; + } + + armada_370_xp_timer_common_init(np); +} +CLOCKSOURCE_OF_DECLARE(armada_375, "marvell,armada-375-timer", + armada_375_timer_init); + static void __init armada_370_timer_init(struct device_node *np) { struct clk *clk = of_clk_get(np, 0); -- cgit v1.2.3