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Subject[PATCH 3/5] msm: timer: SMP timer support for msm
Date
Signed-off-by: Jeff Ohlstein <johlstei@codeaurora.org>
---
arch/arm/mach-msm/include/mach/msm_iomap-8x60.h | 6 +-
arch/arm/mach-msm/io.c | 1 +
arch/arm/mach-msm/timer.c | 139 +++++++++++++++++++++--
3 files changed, 136 insertions(+), 10 deletions(-)
diff --git a/arch/arm/mach-msm/include/mach/msm_iomap-8x60.h b/arch/arm/mach-msm/include/mach/msm_iomap-8x60.h
index 45bab50..873e0b7 100644
--- a/arch/arm/mach-msm/include/mach/msm_iomap-8x60.h
+++ b/arch/arm/mach-msm/include/mach/msm_iomap-8x60.h
@@ -60,7 +60,11 @@

#define MSM_TMR_BASE IOMEM(0xF0200000)
#define MSM_TMR_PHYS 0x02000000
-#define MSM_TMR_SIZE (SZ_1M)
+#define MSM_TMR_SIZE SZ_4K
+
+#define MSM_TMR0_BASE IOMEM(0xF0201000)
+#define MSM_TMR0_PHYS 0x02040000
+#define MSM_TMR0_SIZE SZ_4K

#define MSM_GPT_BASE (MSM_TMR_BASE + 0x4)
#define MSM_DGT_BASE (MSM_TMR_BASE + 0x24)
diff --git a/arch/arm/mach-msm/io.c b/arch/arm/mach-msm/io.c
index d36b610..b826b6b 100644
--- a/arch/arm/mach-msm/io.c
+++ b/arch/arm/mach-msm/io.c
@@ -105,6 +105,7 @@ static struct map_desc msm8x60_io_desc[] __initdata = {
MSM_DEVICE(QGIC_DIST),
MSM_DEVICE(QGIC_CPU),
MSM_DEVICE(TMR),
+ MSM_DEVICE(TMR0),
MSM_DEVICE(ACC),
MSM_DEVICE(GCC),
};
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index 950100f..40f6d17 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)
@@ -67,38 +80,89 @@ struct msm_clock {
uint32_t shift;
};

+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 uint32_t msm_read_timer_count(struct msm_clock *clock,
+ enum timer_location global)
+{
+ uint32_t t1;
+
+ if (global)
+ t1 = readl(clock->regbase + TIMER_COUNT_VAL + MSM_TMR_GLOBAL);
+ else
+ t1 = readl(clock->regbase + TIMER_COUNT_VAL);
+
+ return t1;
+}
+
static cycle_t msm_gpt_read(struct clocksource *cs)
{
- return readl(MSM_GPT_BASE + TIMER_COUNT_VAL);
+ struct msm_clock *clock = &msm_clocks[MSM_CLOCK_GPT];
+
+ return msm_read_timer_count(clock, GLOBAL_TIMER);
}

static cycle_t msm_dgt_read(struct clocksource *cs)
{
- return readl(MSM_DGT_BASE + TIMER_COUNT_VAL) >> MSM_DGT_SHIFT;
+ struct msm_clock *clock = &msm_clocks[MSM_CLOCK_DGT];
+
+ return msm_read_timer_count(clock, GLOBAL_TIMER) >> MSM_DGT_SHIFT;
+}
+
+static struct msm_clock *clockevent_to_clock(struct clock_event_device *evt)
+{
+#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 = msm_read_timer_count(clock, LOCAL_TIMER);
uint32_t alarm = now + (cycles << clock->shift);
int late;

writel(alarm, clock->regbase + TIMER_MATCH_VAL);
- now = readl(clock->regbase + TIMER_COUNT_VAL);
+
+ now = msm_read_timer_count(clock, LOCAL_TIMER);
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);
+ static int print_limit = 10;
+ if (print_limit > 0) {
+ print_limit--;
+ printk(KERN_NOTICE "msm_timer_set_next_event(%lu) "
+ "clock %s, alarm already expired, now %x, "
+ "alarm %x, late %d%s\n",
+ cycles, clock->clockevent.name, now, alarm, late,
+ print_limit ? "" : " stop printing");
+ }
return -ETIME;
}
return 0;
@@ -107,7 +171,11 @@ static int msm_timer_set_next_event(unsigned long cycles,
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);
+ unsigned long irq_flags;
+
+ local_irq_save(irq_flags);
+
switch (mode) {
case CLOCK_EVT_MODE_RESUME:
case CLOCK_EVT_MODE_PERIODIC:
@@ -120,6 +188,7 @@ static void msm_timer_set_mode(enum clock_event_mode mode,
writel(0, clock->regbase + TIMER_ENABLE);
break;
}
+ local_irq_restore(irq_flags);
}

static struct msm_clock msm_clocks[] = {
@@ -220,6 +289,58 @@ static void __init msm_timer_init(void)
}
}

+#ifdef CONFIG_SMP
+void local_timer_setup(struct clock_event_device *evt)
+{
+ unsigned long flags;
+ struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER];
+
+#ifdef CONFIG_ARCH_MSM8X60
+ writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
+#endif
+
+ 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);
+ evt->cpumask = cpumask_of(smp_processor_id());
+
+ local_clock_event = evt;
+
+ local_irq_save(flags);
+ get_irq_chip(clock->irq.irq)->unmask(clock->irq.irq);
+ local_irq_restore(flags);
+
+ clockevents_register_device(evt);
+}
+
+int local_timer_ack(void)
+{
+ return 1;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void __cpuexit local_timer_stop(void)
+{
+ local_clock_event->set_mode(CLOCK_EVT_MODE_SHUTDOWN, local_clock_event);
+ get_irq_chip(local_clock_event->irq)->mask(local_clock_event->irq);
+ local_clock_event = NULL;
+}
+#endif
+#endif
+
struct sys_timer msm_timer = {
.init = msm_timer_init
};
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.


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