diff options
Diffstat (limited to 'drivers/clocksource/vf_pit_timer.c')
| -rw-r--r-- | drivers/clocksource/vf_pit_timer.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/clocksource/vf_pit_timer.c b/drivers/clocksource/vf_pit_timer.c index a0e6c68536a1..934fe264e58d 100644 --- a/drivers/clocksource/vf_pit_timer.c +++ b/drivers/clocksource/vf_pit_timer.c @@ -36,6 +36,7 @@ static void __iomem *clksrc_base; static void __iomem *clkevt_base; static unsigned long cycle_per_jiffy; +static void __iomem *timer_base; static inline void pit_timer_enable(void) { @@ -57,12 +58,17 @@ static u64 notrace pit_read_sched_clock(void) return ~__raw_readl(clksrc_base + PITCVAL); } -static int __init pit_clocksource_init(unsigned long rate) +static void pit_load_and_start_clocksource(int clksrc_ldval) { - /* set the max load value and start the clock source counter */ __raw_writel(0, clksrc_base + PITTCTRL); - __raw_writel(~0UL, clksrc_base + PITLDVAL); + __raw_writel(clksrc_ldval, clksrc_base + PITLDVAL); __raw_writel(PITTCTRL_TEN, clksrc_base + PITTCTRL); +} + +static int __init pit_clocksource_init(unsigned long rate) +{ + /* set the max load value and start the clock source counter */ + pit_load_and_start_clocksource(~0UL); sched_clock_register(pit_read_sched_clock, 32, rate); return clocksource_mmio_init(clksrc_base + PITCVAL, "vf-pit", rate, @@ -118,6 +124,21 @@ static irqreturn_t pit_timer_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } +static unsigned int src_ldval; + +static void pit_resume(struct clock_event_device *evt) +{ + /* Enable the PIT module on resume */ + __raw_writel(~PITMCR_MDIS, timer_base + PITMCR); + + pit_load_and_start_clocksource(src_ldval); +} + +static void pit_suspend(struct clock_event_device *evt) +{ + src_ldval = __raw_readl(clksrc_base + PITLDVAL); +} + static struct clock_event_device clockevent_pit = { .name = "VF pit timer", .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, @@ -125,6 +146,8 @@ static struct clock_event_device clockevent_pit = { .set_state_periodic = pit_set_periodic, .set_next_event = pit_set_next_event, .rating = 300, + .resume = pit_resume, + .suspend = pit_suspend, }; static struct irqaction pit_timer_irq = { @@ -159,7 +182,6 @@ static int __init pit_clockevent_init(unsigned long rate, int irq) static void __init pit_timer_init(struct device_node *np) { struct clk *pit_clk; - void __iomem *timer_base; unsigned long clk_rate; int irq; |