-/* linux/arch/arm/mach-msm/timer.c
+/*
*
* Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
*
*/
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
#include <linux/init.h>
-#include <linux/time.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
-#include <linux/clk.h>
-#include <linux/clockchips.h>
-#include <linux/delay.h>
#include <linux/io.h>
#include <asm/mach/time.h>
#include <asm/hardware/gic.h>
+#include <asm/localtimer.h>
#include <mach/msm_iomap.h>
#include <mach/cpu.h>
+#include <mach/board.h>
#define TIMER_MATCH_VAL 0x0000
#define TIMER_COUNT_VAL 0x0004
#define TIMER_ENABLE 0x0008
-#define TIMER_ENABLE_CLR_ON_MATCH_EN 2
-#define TIMER_ENABLE_EN 1
+#define TIMER_ENABLE_CLR_ON_MATCH_EN BIT(1)
+#define TIMER_ENABLE_EN BIT(0)
#define TIMER_CLEAR 0x000C
#define DGT_CLK_CTL 0x0034
-enum {
- DGT_CLK_CTL_DIV_1 = 0,
- DGT_CLK_CTL_DIV_2 = 1,
- DGT_CLK_CTL_DIV_3 = 2,
- DGT_CLK_CTL_DIV_4 = 3,
-};
-#define CSR_PROTECTION 0x0020
-#define CSR_PROTECTION_EN 1
+#define DGT_CLK_CTL_DIV_4 0x3
#define GPT_HZ 32768
-enum timer_location {
- LOCAL_TIMER = 0,
- GLOBAL_TIMER = 1,
-};
-
-#define MSM_GLOBAL_TIMER MSM_CLOCK_DGT
-
-/* TODO: Remove these ifdefs */
-#if defined(CONFIG_ARCH_QSD8X50)
-#define DGT_HZ (19200000 / 4) /* 19.2 MHz / 4 by default */
-#define MSM_DGT_SHIFT (0)
-#elif defined(CONFIG_ARCH_MSM7X30)
-#define DGT_HZ (24576000 / 4) /* 24.576 MHz (LPXO) / 4 by default */
-#define MSM_DGT_SHIFT (0)
-#elif defined(CONFIG_ARCH_MSM8X60) || defined(CONFIG_ARCH_MSM8960)
-#define DGT_HZ (27000000 / 4) /* 27 MHz (PXO) / 4 by default */
-#define MSM_DGT_SHIFT (0)
-#else
-#define DGT_HZ 19200000 /* 19.2 MHz or 600 KHz after shift */
-#define MSM_DGT_SHIFT (5)
-#endif
+#define MSM_DGT_SHIFT 5
-struct msm_clock {
- struct clock_event_device clockevent;
- struct clocksource clocksource;
- unsigned int irq;
- void __iomem *regbase;
- uint32_t freq;
- uint32_t shift;
- void __iomem *global_counter;
- void __iomem *local_counter;
- union {
- struct clock_event_device *evt;
- struct clock_event_device __percpu **percpu_evt;
- };
-};
-
-enum {
- MSM_CLOCK_GPT,
- MSM_CLOCK_DGT,
- NR_TIMERS,
-};
-
-
-static struct msm_clock msm_clocks[];
+static void __iomem *event_base;
static irqreturn_t msm_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = *(struct clock_event_device **)dev_id;
- if (evt->event_handler == NULL)
- return IRQ_HANDLED;
+ /* Stop the timer tick */
+ if (evt->mode == CLOCK_EVT_MODE_ONESHOT) {
+ u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE);
+ ctrl &= ~TIMER_ENABLE_EN;
+ writel_relaxed(ctrl, event_base + TIMER_ENABLE);
+ }
evt->event_handler(evt);
return IRQ_HANDLED;
}
-static cycle_t msm_read_timer_count(struct clocksource *cs)
-{
- struct msm_clock *clk = container_of(cs, struct msm_clock, clocksource);
-
- /*
- * Shift timer count down by a constant due to unreliable lower bits
- * on some targets.
- */
- return readl(clk->global_counter) >> clk->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 = clockevent_to_clock(evt);
- uint32_t now = readl(clock->local_counter);
- uint32_t alarm = now + (cycles << clock->shift);
+ u32 ctrl = readl_relaxed(event_base + TIMER_ENABLE);
- writel(alarm, clock->regbase + TIMER_MATCH_VAL);
+ writel_relaxed(0, event_base + TIMER_CLEAR);
+ writel_relaxed(cycles, event_base + TIMER_MATCH_VAL);
+ writel_relaxed(ctrl | TIMER_ENABLE_EN, event_base + TIMER_ENABLE);
return 0;
}
static void msm_timer_set_mode(enum clock_event_mode mode,
struct clock_event_device *evt)
{
- struct msm_clock *clock = clockevent_to_clock(evt);
+ u32 ctrl;
+
+ ctrl = readl_relaxed(event_base + TIMER_ENABLE);
+ ctrl &= ~(TIMER_ENABLE_EN | TIMER_ENABLE_CLR_ON_MATCH_EN);
switch (mode) {
case CLOCK_EVT_MODE_RESUME:
case CLOCK_EVT_MODE_PERIODIC:
break;
case CLOCK_EVT_MODE_ONESHOT:
- writel(TIMER_ENABLE_EN, clock->regbase + TIMER_ENABLE);
+ /* Timer is enabled in set_next_event */
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
- writel(0, clock->regbase + TIMER_ENABLE);
break;
}
+ writel_relaxed(ctrl, event_base + TIMER_ENABLE);
}
-static struct msm_clock msm_clocks[] = {
- [MSM_CLOCK_GPT] = {
- .clockevent = {
- .name = "gp_timer",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .shift = 32,
- .rating = 200,
- .set_next_event = msm_timer_set_next_event,
- .set_mode = msm_timer_set_mode,
- },
- .clocksource = {
- .name = "gp_timer",
- .rating = 200,
- .read = msm_read_timer_count,
- .mask = CLOCKSOURCE_MASK(32),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
- },
- .irq = INT_GP_TIMER_EXP,
- .freq = GPT_HZ,
- },
- [MSM_CLOCK_DGT] = {
- .clockevent = {
- .name = "dg_timer",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .shift = 32 + MSM_DGT_SHIFT,
- .rating = 300,
- .set_next_event = msm_timer_set_next_event,
- .set_mode = msm_timer_set_mode,
- },
- .clocksource = {
- .name = "dg_timer",
- .rating = 300,
- .read = msm_read_timer_count,
- .mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT)),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS,
- },
- .irq = INT_DEBUG_TIMER_EXP,
- .freq = DGT_HZ >> MSM_DGT_SHIFT,
- .shift = MSM_DGT_SHIFT,
- }
+static struct clock_event_device msm_clockevent = {
+ .name = "gp_timer",
+ .features = CLOCK_EVT_FEAT_ONESHOT,
+ .rating = 200,
+ .set_next_event = msm_timer_set_next_event,
+ .set_mode = msm_timer_set_mode,
+};
+
+static union {
+ struct clock_event_device *evt;
+ struct clock_event_device __percpu **percpu_evt;
+} msm_evt;
+
+static void __iomem *source_base;
+
+static cycle_t msm_read_timer_count(struct clocksource *cs)
+{
+ return readl_relaxed(source_base + TIMER_COUNT_VAL);
+}
+
+static cycle_t msm_read_timer_count_shift(struct clocksource *cs)
+{
+ /*
+ * Shift timer count down by a constant due to unreliable lower bits
+ * on some targets.
+ */
+ return msm_read_timer_count(cs) >> MSM_DGT_SHIFT;
+}
+
+static struct clocksource msm_clocksource = {
+ .name = "dg_timer",
+ .rating = 300,
+ .read = msm_read_timer_count,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
static void __init msm_timer_init(void)
{
- int i;
+ struct clock_event_device *ce = &msm_clockevent;
+ struct clocksource *cs = &msm_clocksource;
int res;
- int global_offset = 0;
+ u32 dgt_hz;
if (cpu_is_msm7x01()) {
- msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE;
- msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x10;
+ event_base = MSM_CSR_BASE;
+ source_base = MSM_CSR_BASE + 0x10;
+ dgt_hz = 19200000 >> MSM_DGT_SHIFT; /* 600 KHz */
+ cs->read = msm_read_timer_count_shift;
+ cs->mask = CLOCKSOURCE_MASK((32 - MSM_DGT_SHIFT));
} else if (cpu_is_msm7x30()) {
- msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE + 0x04;
- msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x24;
+ event_base = MSM_CSR_BASE + 0x04;
+ source_base = MSM_CSR_BASE + 0x24;
+ dgt_hz = 24576000 / 4;
} else if (cpu_is_qsd8x50()) {
- msm_clocks[MSM_CLOCK_GPT].regbase = MSM_CSR_BASE;
- msm_clocks[MSM_CLOCK_DGT].regbase = MSM_CSR_BASE + 0x10;
+ event_base = MSM_CSR_BASE;
+ source_base = MSM_CSR_BASE + 0x10;
+ dgt_hz = 19200000 / 4;
} else if (cpu_is_msm8x60() || cpu_is_msm8960()) {
- msm_clocks[MSM_CLOCK_GPT].regbase = MSM_TMR_BASE + 0x04;
- msm_clocks[MSM_CLOCK_DGT].regbase = MSM_TMR_BASE + 0x24;
-
- /* Use CPU0's timer as the global timer. */
- global_offset = MSM_TMR0_BASE - MSM_TMR_BASE;
+ event_base = MSM_TMR_BASE + 0x04;
+ /* Use CPU0's timer as the global clock source. */
+ source_base = MSM_TMR0_BASE + 0x24;
+ dgt_hz = 27000000 / 4;
+ writel_relaxed(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
} else
BUG();
-#ifdef CONFIG_ARCH_MSM_SCORPIONMP
- writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
-#endif
-
- for (i = 0; i < ARRAY_SIZE(msm_clocks); i++) {
- struct msm_clock *clock = &msm_clocks[i];
- struct clock_event_device *ce = &clock->clockevent;
- struct clocksource *cs = &clock->clocksource;
-
- clock->local_counter = clock->regbase + TIMER_COUNT_VAL;
- clock->global_counter = clock->local_counter + global_offset;
-
- writel(0, clock->regbase + TIMER_ENABLE);
- writel(0, clock->regbase + TIMER_CLEAR);
- writel(~0, clock->regbase + TIMER_MATCH_VAL);
-
- ce->mult = div_sc(clock->freq, NSEC_PER_SEC, ce->shift);
- /* allow at least 10 seconds to notice that the timer wrapped */
- ce->max_delta_ns =
- clockevent_delta2ns(0xf0000000 >> clock->shift, ce);
- /* 4 gets rounded down to 3 */
- ce->min_delta_ns = clockevent_delta2ns(4, ce);
- ce->cpumask = cpumask_of(0);
-
- res = clocksource_register_hz(cs, clock->freq);
- if (res)
- printk(KERN_ERR "msm_timer_init: clocksource_register "
- "failed for %s\n", cs->name);
-
- ce->irq = clock->irq;
- if (cpu_is_msm8x60() || cpu_is_msm8960()) {
- clock->percpu_evt = alloc_percpu(struct clock_event_device *);
- if (!clock->percpu_evt) {
- pr_err("msm_timer_init: memory allocation "
- "failed for %s\n", ce->name);
- continue;
- }
-
- *__this_cpu_ptr(clock->percpu_evt) = ce;
- res = request_percpu_irq(ce->irq, msm_timer_interrupt,
- ce->name, clock->percpu_evt);
- if (!res)
- enable_percpu_irq(ce->irq, 0);
- } else {
- clock->evt = ce;
- res = request_irq(ce->irq, msm_timer_interrupt,
- IRQF_TIMER | IRQF_NOBALANCING | IRQF_TRIGGER_RISING,
- ce->name, &clock->evt);
+ writel_relaxed(0, event_base + TIMER_ENABLE);
+ writel_relaxed(0, event_base + TIMER_CLEAR);
+ writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
+ ce->cpumask = cpumask_of(0);
+
+ ce->irq = INT_GP_TIMER_EXP;
+ clockevents_config_and_register(ce, GPT_HZ, 4, 0xffffffff);
+ if (cpu_is_msm8x60() || cpu_is_msm8960()) {
+ msm_evt.percpu_evt = alloc_percpu(struct clock_event_device *);
+ if (!msm_evt.percpu_evt) {
+ pr_err("memory allocation failed for %s\n", ce->name);
+ goto err;
}
-
- if (res)
- pr_err("msm_timer_init: request_irq failed for %s\n",
- ce->name);
-
- clockevents_register_device(ce);
+ *__this_cpu_ptr(msm_evt.percpu_evt) = ce;
+ res = request_percpu_irq(ce->irq, msm_timer_interrupt,
+ ce->name, msm_evt.percpu_evt);
+ if (!res)
+ enable_percpu_irq(ce->irq, 0);
+ } else {
+ msm_evt.evt = ce;
+ res = request_irq(ce->irq, msm_timer_interrupt,
+ IRQF_TIMER | IRQF_NOBALANCING |
+ IRQF_TRIGGER_RISING, ce->name, &msm_evt.evt);
}
+
+ if (res)
+ pr_err("request_irq failed for %s\n", ce->name);
+err:
+ writel_relaxed(TIMER_ENABLE_EN, source_base + TIMER_ENABLE);
+ res = clocksource_register_hz(cs, dgt_hz);
+ if (res)
+ pr_err("clocksource_register failed\n");
}
-#ifdef CONFIG_SMP
+#ifdef CONFIG_LOCAL_TIMERS
int __cpuinit local_timer_setup(struct clock_event_device *evt)
{
- static bool local_timer_inited;
- struct msm_clock *clock = &msm_clocks[MSM_GLOBAL_TIMER];
-
/* Use existing clock_event for cpu 0 */
if (!smp_processor_id())
return 0;
- writel(DGT_CLK_CTL_DIV_4, MSM_TMR_BASE + DGT_CLK_CTL);
-
- if (!local_timer_inited) {
- writel(0, clock->regbase + TIMER_ENABLE);
- writel(0, clock->regbase + TIMER_CLEAR);
- writel(~0, clock->regbase + TIMER_MATCH_VAL);
- local_timer_inited = true;
- }
- evt->irq = clock->irq;
+ writel_relaxed(0, event_base + TIMER_ENABLE);
+ writel_relaxed(0, event_base + TIMER_CLEAR);
+ writel_relaxed(~0, event_base + TIMER_MATCH_VAL);
+ evt->irq = msm_clockevent.irq;
evt->name = "local_timer";
- evt->features = CLOCK_EVT_FEAT_ONESHOT;
- evt->rating = clock->clockevent.rating;
+ evt->features = msm_clockevent.features;
+ evt->rating = msm_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->shift = msm_clockevent.shift;
+ evt->mult = div_sc(GPT_HZ, NSEC_PER_SEC, evt->shift);
+ evt->max_delta_ns = clockevent_delta2ns(0xf0000000, evt);
evt->min_delta_ns = clockevent_delta2ns(4, evt);
- *__this_cpu_ptr(clock->percpu_evt) = evt;
- enable_percpu_irq(evt->irq, 0);
-
+ *__this_cpu_ptr(msm_evt.percpu_evt) = evt;
clockevents_register_device(evt);
+ enable_percpu_irq(evt->irq, 0);
return 0;
}
evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt);
disable_percpu_irq(evt->irq);
}
-
-#endif
+#endif /* CONFIG_LOCAL_TIMERS */
struct sys_timer msm_timer = {
.init = msm_timer_init
projects / linux-2.6-block.git / commitdiff