[PATCH 08/24] msm: timer: support 8x60 timers
Jeff Ohlstein
johlstei at codeaurora.org
Wed Aug 25 00:57:37 EDT 2010
Signed-off-by: Jeff Ohlstein <johlstei at codeaurora.org>
---
arch/arm/mach-msm/include/mach/msm_iomap-8x60.h | 10 +-
arch/arm/mach-msm/timer.c | 226 +++++++++++++++++------
2 files changed, 177 insertions(+), 59 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 ee58da5..1f15bbb 100644
--- a/arch/arm/mach-msm/include/mach/msm_iomap-8x60.h
+++ b/arch/arm/mach-msm/include/mach/msm_iomap-8x60.h
@@ -35,7 +35,6 @@
*
*/
-
#define MSM_QGIC_DIST_BASE IOMEM(0xF0000000)
#define MSM_QGIC_DIST_PHYS 0x02080000
#define MSM_QGIC_DIST_SIZE SZ_4K
@@ -56,7 +55,14 @@
#define MSM_TLMM_PHYS 0x00800000
#define MSM_TLMM_SIZE SZ_16K
-#define MSM_SHARED_RAM_BASE IOMEM(0xF0100000)
+#define MSM_TMR_BASE IOMEM(0xF0100000)
+#define MSM_TMR_PHYS 0x02000000
+#define MSM_TMR_SIZE (SZ_1M)
+
+#define MSM_GPT_BASE (MSM_TMR_BASE + 0x4)
+#define MSM_DGT_BASE (MSM_TMR_BASE + 0x24)
+
+#define MSM_SHARED_RAM_BASE IOMEM(0xF0200000)
#define MSM_SHARED_RAM_SIZE SZ_1M
diff --git a/arch/arm/mach-msm/timer.c b/arch/arm/mach-msm/timer.c
index dec5ca6..e76d869 100644
--- a/arch/arm/mach-msm/timer.c
+++ b/arch/arm/mach-msm/timer.c
@@ -1,6 +1,6 @@
-/* linux/arch/arm/mach-msm/timer.c
- *
+/*
* Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2009-2010, 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
@@ -21,6 +21,7 @@
#include <linux/clockchips.h>
#include <linux/delay.h>
#include <linux/io.h>
+#include <linux/percpu.h>
#include <asm/mach/time.h>
#include <mach/msm_iomap.h>
@@ -28,7 +29,20 @@
#ifndef MSM_DGT_BASE
#define MSM_DGT_BASE (MSM_GPT_BASE + 0x10)
#endif
+
+#ifdef CONFIG_MSM7X00A_USE_GP_TIMER
+ #define DG_TIMER_RATING 100
+ #define MSM_GLOBAL_TIMER MSM_CLOCK_GPT
+#else
+ #define DG_TIMER_RATING 300
+ #define MSM_GLOBAL_TIMER MSM_CLOCK_DGT
+#endif
+
+#if defined(CONFIG_ARCH_MSM_ARM11)
#define MSM_DGT_SHIFT (5)
+#else
+#define MSM_DGT_SHIFT (0)
+#endif
#define TIMER_MATCH_VAL 0x0000
#define TIMER_COUNT_VAL 0x0004
@@ -40,8 +54,32 @@
#define CSR_PROTECTION 0x0020
#define CSR_PROTECTION_EN 1
+#define LOCAL_TIMER 0
+#define GLOBAL_TIMER 1
+
+#ifdef CONFIG_ARCH_MSM8X60
+#define MSM_TMR_BASE_CPU0 0x40000
+#else
+#define MSM_TMR_BASE_CPU0 0
+#endif
+
+#define NR_TIMERS ARRAY_SIZE(msm_clocks)
+
#define GPT_HZ 32768
-#define DGT_HZ 19200000 /* 19.2 MHz or 600 KHz after shift */
+
+#if defined(CONFIG_ARCH_QSD8X50) || defined(CONFIG_ARCH_MSM8X60)
+#define DGT_HZ 4800000 /* Uses TCXO/4 (19.2 MHz / 4) */
+#else
+#define DGT_HZ 19200000 /* Uses TCXO (19.2 MHz) */
+#endif
+
+static irqreturn_t msm_timer_interrupt(int irq, void *dev_id);
+static cycle_t msm_gpt_read(struct clocksource *cs);
+static cycle_t msm_dgt_read(struct clocksource *cs);
+static void msm_timer_set_mode(enum clock_event_mode mode,
+ struct clock_event_device *evt);
+static int msm_timer_set_next_event(unsigned long cycles,
+ struct clock_event_device *evt);
struct msm_clock {
struct clock_event_device clockevent;
@@ -52,60 +90,10 @@ struct msm_clock {
uint32_t shift;
};
-static irqreturn_t msm_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = dev_id;
- evt->event_handler(evt);
- return IRQ_HANDLED;
-}
-
-static cycle_t msm_gpt_read(struct clocksource *cs)
-{
- return readl(MSM_GPT_BASE + TIMER_COUNT_VAL);
-}
-
-static cycle_t msm_dgt_read(struct clocksource *cs)
-{
- return readl(MSM_DGT_BASE + TIMER_COUNT_VAL) >> MSM_DGT_SHIFT;
-}
-
-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);
- 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);
- 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);
- break;
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- writel(0, clock->regbase + TIMER_ENABLE);
- break;
- }
-}
+enum {
+ MSM_CLOCK_GPT,
+ MSM_CLOCK_DGT,
+};
static struct msm_clock msm_clocks[] = {
{
@@ -165,6 +153,89 @@ 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)
+{
+ struct msm_clock *clock =
+ container_of(cs, struct msm_clock, clocksource);
+ return readl(clock->regbase + TIMER_COUNT_VAL + MSM_TMR_BASE_CPU0);
+}
+
+static cycle_t msm_dgt_read(struct clocksource *cs)
+{
+ struct msm_clock *clock =
+ container_of(cs, struct msm_clock, clocksource);
+ return readl(clock->regbase + TIMER_COUNT_VAL + MSM_TMR_BASE_CPU0)
+ >> MSM_DGT_SHIFT;
+}
+
+static int msm_timer_set_next_event(unsigned long cycles,
+ struct clock_event_device *evt)
+{
+ struct msm_clock *clock;
+ uint32_t now;
+ uint32_t alarm;
+ int late;
+
+#ifdef CONFIG_SMP
+ clock = &msm_clocks[MSM_GLOBAL_TIMER];
+#else
+ clock = container_of(evt, struct msm_clock, clockevent);
+#endif
+ now = readl(clock->regbase + TIMER_COUNT_VAL);
+ alarm = now + (cycles << clock->shift);
+ writel(alarm, clock->regbase + TIMER_MATCH_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;
+ unsigned long irq_flags;
+
+#ifdef CONFIG_SMP
+ clock = &msm_clocks[MSM_GLOBAL_TIMER];
+#else
+ clock = container_of(evt, struct msm_clock, clockevent);
+#endif
+ local_irq_save(irq_flags);
+
+ 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);
+ break;
+ case CLOCK_EVT_MODE_UNUSED:
+ case CLOCK_EVT_MODE_SHUTDOWN:
+ writel(0, clock->regbase + TIMER_ENABLE);
+ break;
+ }
+
+ local_irq_restore(irq_flags);
+}
+
static void __init msm_timer_init(void)
{
int i;
@@ -201,6 +272,47 @@ 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];
+
+ if (!local_clock_event) {
+ writel(0, clock->regbase + TIMER_ENABLE);
+ writel(1, clock->regbase + TIMER_CLEAR);
+ writel(0, clock->regbase + TIMER_COUNT_VAL);
+ 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;
+}
+
+#endif
+
struct sys_timer msm_timer = {
.init = msm_timer_init
};
--
1.7.2.1
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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