diff options
Diffstat (limited to 'arch/arm/mach-msm/timer.c')
| -rw-r--r-- | arch/arm/mach-msm/timer.c | 125 |
1 files changed, 102 insertions, 23 deletions
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c index 595be7fea31a..c105d28b53e3 100644 --- a/arch/arm/mach-msm/timer.c +++ b/arch/arm/mach-msm/timer.c @@ -47,6 +47,19 @@ enum { #define GPT_HZ 32768 +enum timer_location { + LOCAL_TIMER = 0, + GLOBAL_TIMER = 1, +}; + +#ifdef MSM_TMR0_BASE +#define MSM_TMR_GLOBAL (MSM_TMR0_BASE - MSM_TMR_BASE) +#else +#define MSM_TMR_GLOBAL 0 +#endif + +#define MSM_GLOBAL_TIMER MSM_CLOCK_DGT + #if defined(CONFIG_ARCH_QSD8X50) #define DGT_HZ (19200000 / 4) /* 19.2 MHz / 4 by default */ #define MSM_DGT_SHIFT (0) @@ -65,49 +78,67 @@ struct msm_clock { void __iomem *regbase; uint32_t freq; uint32_t shift; + void __iomem *global_counter; + void __iomem *local_counter; +}; + +enum { + MSM_CLOCK_GPT, + MSM_CLOCK_DGT, + NR_TIMERS, }; + +static struct msm_clock msm_clocks[]; +static struct clock_event_device *local_clock_event; + static irqreturn_t msm_timer_interrupt(int irq, void *dev_id) { struct clock_event_device *evt = dev_id; + if (smp_processor_id() != 0) + evt = local_clock_event; + if (evt->event_handler == NULL) + return IRQ_HANDLED; evt->event_handler(evt); return IRQ_HANDLED; } -static cycle_t msm_gpt_read(struct clocksource *cs) +static cycle_t msm_read_timer_count(struct clocksource *cs) { - return readl(MSM_GPT_BASE + TIMER_COUNT_VAL); + struct msm_clock *clk = container_of(cs, struct msm_clock, clocksource); + + return readl(clk->global_counter); } -static cycle_t msm_dgt_read(struct clocksource *cs) +static struct msm_clock *clockevent_to_clock(struct clock_event_device *evt) { - return readl(MSM_DGT_BASE + TIMER_COUNT_VAL) >> MSM_DGT_SHIFT; +#ifdef CONFIG_SMP + int i; + for (i = 0; i < NR_TIMERS; i++) + if (evt == &(msm_clocks[i].clockevent)) + return &msm_clocks[i]; + return &msm_clocks[MSM_GLOBAL_TIMER]; +#else + return container_of(evt, struct msm_clock, clockevent); +#endif } static int msm_timer_set_next_event(unsigned long cycles, struct clock_event_device *evt) { - struct msm_clock *clock = container_of(evt, struct msm_clock, clockevent); - uint32_t now = readl(clock->regbase + TIMER_COUNT_VAL); + struct msm_clock *clock = clockevent_to_clock(evt); + uint32_t now = readl(clock->local_counter); uint32_t alarm = now + (cycles << clock->shift); - int late; writel(alarm, clock->regbase + TIMER_MATCH_VAL); - now = readl(clock->regbase + TIMER_COUNT_VAL); - late = now - alarm; - if (late >= (-2 << clock->shift) && late < DGT_HZ*5) { - printk(KERN_NOTICE "msm_timer_set_next_event(%lu) clock %s, " - "alarm already expired, now %x, alarm %x, late %d\n", - cycles, clock->clockevent.name, now, alarm, late); - return -ETIME; - } return 0; } static void msm_timer_set_mode(enum clock_event_mode mode, struct clock_event_device *evt) { - struct msm_clock *clock = container_of(evt, struct msm_clock, clockevent); + struct msm_clock *clock = clockevent_to_clock(evt); + switch (mode) { case CLOCK_EVT_MODE_RESUME: case CLOCK_EVT_MODE_PERIODIC: @@ -123,7 +154,7 @@ static void msm_timer_set_mode(enum clock_event_mode mode, } static struct msm_clock msm_clocks[] = { - { + [MSM_CLOCK_GPT] = { .clockevent = { .name = "gp_timer", .features = CLOCK_EVT_FEAT_ONESHOT, @@ -135,7 +166,7 @@ static struct msm_clock msm_clocks[] = { .clocksource = { .name = "gp_timer", .rating = 200, - .read = msm_gpt_read, + .read = msm_read_timer_count, .mask = CLOCKSOURCE_MASK(32), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }, @@ -147,9 +178,12 @@ static struct msm_clock msm_clocks[] = { .irq = INT_GP_TIMER_EXP }, .regbase = MSM_GPT_BASE, - .freq = GPT_HZ + .freq = GPT_HZ, + .local_counter = MSM_GPT_BASE + TIMER_COUNT_VAL, + .global_counter = MSM_GPT_BASE + TIMER_COUNT_VAL + + MSM_TMR_GLOBAL, }, - { + [MSM_CLOCK_DGT] = { .clockevent = { .name = "dg_timer", .features = CLOCK_EVT_FEAT_ONESHOT, @@ -161,7 +195,7 @@ static struct msm_clock msm_clocks[] = { .clocksource = { .name = "dg_timer", .rating = 300, - .read = msm_dgt_read, + .read = msm_read_timer_count, .mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT)), .flags = CLOCK_SOURCE_IS_CONTINUOUS, }, @@ -174,7 +208,10 @@ static struct msm_clock msm_clocks[] = { }, .regbase = MSM_DGT_BASE, .freq = DGT_HZ >> MSM_DGT_SHIFT, - .shift = MSM_DGT_SHIFT + .shift = MSM_DGT_SHIFT, + .local_counter = MSM_DGT_BASE + TIMER_COUNT_VAL, + .global_counter = MSM_DGT_BASE + TIMER_COUNT_VAL + + MSM_TMR_GLOBAL, } }; @@ -183,7 +220,7 @@ static void __init msm_timer_init(void) int i; int res; -#ifdef CONFIG_ARCH_MSM8X60 +#ifdef CONFIG_ARCH_MSM_SCORPIONMP writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL); #endif @@ -217,6 +254,48 @@ static void __init msm_timer_init(void) } } +#ifdef CONFIG_SMP +void __cpuinit local_timer_setup(struct clock_event_device *evt) +{ + struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER]; + + /* Use existing clock_event for cpu 0 */ + if (!smp_processor_id()) + return; + + writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL); + + if (!local_clock_event) { + writel(0, clock->regbase + TIMER_ENABLE); + writel(0, clock->regbase + TIMER_CLEAR); + writel(~0, clock->regbase + TIMER_MATCH_VAL); + } + evt->irq = clock->irq.irq; + evt->name = "local_timer"; + evt->features = CLOCK_EVT_FEAT_ONESHOT; + evt->rating = clock->clockevent.rating; + evt->set_mode = msm_timer_set_mode; + evt->set_next_event = msm_timer_set_next_event; + evt->shift = clock->clockevent.shift; + evt->mult = div_sc(clock->freq, NSEC_PER_SEC, evt->shift); + evt->max_delta_ns = + clockevent_delta2ns(0xf0000000 >> clock->shift, evt); + evt->min_delta_ns = clockevent_delta2ns(4, evt); + + local_clock_event = evt; + + gic_enable_ppi(clock->irq.irq); + + clockevents_register_device(evt); +} + +inline int local_timer_ack(void) +{ + return 1; +} + +#endif + struct sys_timer msm_timer = { .init = msm_timer_init }; |