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authorChanghwan Youn <chaos.youn@samsung.com>2011-07-16 10:49:53 +0900
committerKukjin Kim <kgene.kim@samsung.com>2011-07-20 23:33:43 +0900
commit069d4e743c4b0c56c5a5374e1636db3ffe24ca32 (patch)
tree864effe3ba5031657af0282ef2bba29c7d104c7e /arch/arm/mach-exynos4
parentaab74d3e753649defa52ea43cbec1e91ebb4cc8e (diff)
ARM: EXYNOS4: Remove clock event timers using ARM private timers
External GIC cannot support PPI (Private Peripheral Interrupt) for ARM private timers. Thus MCT should be selected as clock event timers by default. Signed-off-by: Changhwan Youn <chaos.youn@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/mach-exynos4')
-rw-r--r--arch/arm/mach-exynos4/Kconfig3
-rw-r--r--arch/arm/mach-exynos4/Makefile7
-rw-r--r--arch/arm/mach-exynos4/cpu.c2
-rw-r--r--arch/arm/mach-exynos4/include/mach/entry-macro.S6
-rw-r--r--arch/arm/mach-exynos4/include/mach/irqs.h2
-rw-r--r--arch/arm/mach-exynos4/localtimer.c26
-rw-r--r--arch/arm/mach-exynos4/time.c301
7 files changed, 4 insertions, 343 deletions
diff --git a/arch/arm/mach-exynos4/Kconfig b/arch/arm/mach-exynos4/Kconfig
index 5115b90d1a7..a4fb109984f 100644
--- a/arch/arm/mach-exynos4/Kconfig
+++ b/arch/arm/mach-exynos4/Kconfig
@@ -16,7 +16,8 @@ config CPU_EXYNOS4210
Enable EXYNOS4210 CPU support
config EXYNOS4_MCT
- bool "Kernel timer support by MCT"
+ bool
+ default y
help
Use MCT (Multi Core Timer) as kernel timers
diff --git a/arch/arm/mach-exynos4/Makefile b/arch/arm/mach-exynos4/Makefile
index 60fe5ecf359..c3c70aba497 100644
--- a/arch/arm/mach-exynos4/Makefile
+++ b/arch/arm/mach-exynos4/Makefile
@@ -20,12 +20,7 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle.o
obj-$(CONFIG_SMP) += platsmp.o headsmp.o
-ifeq ($(CONFIG_EXYNOS4_MCT),y)
-obj-y += mct.o
-else
-obj-y += time.o
-obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
-endif
+obj-$(CONFIG_EXYNOS4_MCT) += mct.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
diff --git a/arch/arm/mach-exynos4/cpu.c b/arch/arm/mach-exynos4/cpu.c
index 7dccf4ab11f..910ade65e03 100644
--- a/arch/arm/mach-exynos4/cpu.c
+++ b/arch/arm/mach-exynos4/cpu.c
@@ -173,7 +173,7 @@ void __init exynos4_init_irq(void)
{
int irq;
- gic_init(0, IRQ_LOCALTIMER, S5P_VA_GIC_DIST, S5P_VA_GIC_CPU);
+ gic_init(0, IRQ_SPI(0), S5P_VA_GIC_DIST, S5P_VA_GIC_CPU);
gic_arch_extn.irq_eoi = exynos4_gic_irq_eoi;
for (irq = 0; irq < MAX_COMBINER_NR; irq++) {
diff --git a/arch/arm/mach-exynos4/include/mach/entry-macro.S b/arch/arm/mach-exynos4/include/mach/entry-macro.S
index 4fad076baa4..d7a1e281ce7 100644
--- a/arch/arm/mach-exynos4/include/mach/entry-macro.S
+++ b/arch/arm/mach-exynos4/include/mach/entry-macro.S
@@ -80,10 +80,4 @@
/* As above, this assumes that irqstat and base are preserved.. */
.macro test_for_ltirq, irqnr, irqstat, base, tmp
- bic \irqnr, \irqstat, #0x1c00
- mov \tmp, #0
- cmp \irqnr, #29
- moveq \tmp, #1
- streq \irqstat, [\base, #GIC_CPU_EOI]
- cmp \tmp, #0
.endm
diff --git a/arch/arm/mach-exynos4/include/mach/irqs.h b/arch/arm/mach-exynos4/include/mach/irqs.h
index e497ea223eb..250427f6dcc 100644
--- a/arch/arm/mach-exynos4/include/mach/irqs.h
+++ b/arch/arm/mach-exynos4/include/mach/irqs.h
@@ -19,8 +19,6 @@
#define IRQ_PPI(x) S5P_IRQ(x+16)
-#define IRQ_LOCALTIMER IRQ_PPI(13)
-
/* SPI: Shared Peripheral Interrupt */
#define IRQ_SPI(x) S5P_IRQ(x+32)
diff --git a/arch/arm/mach-exynos4/localtimer.c b/arch/arm/mach-exynos4/localtimer.c
deleted file mode 100644
index 6bf3d0ab962..00000000000
--- a/arch/arm/mach-exynos4/localtimer.c
+++ /dev/null
@@ -1,26 +0,0 @@
-/* linux/arch/arm/mach-exynos4/localtimer.c
- *
- * Cloned from linux/arch/arm/mach-realview/localtimer.c
- *
- * Copyright (C) 2002 ARM Ltd.
- * All Rights Reserved
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-#include <linux/clockchips.h>
-
-#include <asm/irq.h>
-#include <asm/localtimer.h>
-
-/*
- * Setup the local clock events for a CPU.
- */
-int __cpuinit local_timer_setup(struct clock_event_device *evt)
-{
- evt->irq = IRQ_LOCALTIMER;
- twd_timer_setup(evt);
- return 0;
-}
diff --git a/arch/arm/mach-exynos4/time.c b/arch/arm/mach-exynos4/time.c
deleted file mode 100644
index ebb8f38d540..00000000000
--- a/arch/arm/mach-exynos4/time.c
+++ /dev/null
@@ -1,301 +0,0 @@
-/* linux/arch/arm/mach-exynos4/time.c
- *
- * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
- * http://www.samsung.com
- *
- * EXYNOS4 (and compatible) HRT support
- * PWM 2/4 is used for this feature
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
-*/
-
-#include <linux/sched.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/clockchips.h>
-#include <linux/platform_device.h>
-
-#include <asm/smp_twd.h>
-
-#include <mach/map.h>
-#include <plat/regs-timer.h>
-#include <asm/mach/time.h>
-
-static unsigned long clock_count_per_tick;
-
-static struct clk *tin2;
-static struct clk *tin4;
-static struct clk *tdiv2;
-static struct clk *tdiv4;
-static struct clk *timerclk;
-
-static void exynos4_pwm_stop(unsigned int pwm_id)
-{
- unsigned long tcon;
-
- tcon = __raw_readl(S3C2410_TCON);
-
- switch (pwm_id) {
- case 2:
- tcon &= ~S3C2410_TCON_T2START;
- break;
- case 4:
- tcon &= ~S3C2410_TCON_T4START;
- break;
- default:
- break;
- }
- __raw_writel(tcon, S3C2410_TCON);
-}
-
-static void exynos4_pwm_init(unsigned int pwm_id, unsigned long tcnt)
-{
- unsigned long tcon;
-
- tcon = __raw_readl(S3C2410_TCON);
-
- /* timers reload after counting zero, so reduce the count by 1 */
- tcnt--;
-
- /* ensure timer is stopped... */
- switch (pwm_id) {
- case 2:
- tcon &= ~(0xf<<12);
- tcon |= S3C2410_TCON_T2MANUALUPD;
-
- __raw_writel(tcnt, S3C2410_TCNTB(2));
- __raw_writel(tcnt, S3C2410_TCMPB(2));
- __raw_writel(tcon, S3C2410_TCON);
-
- break;
- case 4:
- tcon &= ~(7<<20);
- tcon |= S3C2410_TCON_T4MANUALUPD;
-
- __raw_writel(tcnt, S3C2410_TCNTB(4));
- __raw_writel(tcnt, S3C2410_TCMPB(4));
- __raw_writel(tcon, S3C2410_TCON);
-
- break;
- default:
- break;
- }
-}
-
-static inline void exynos4_pwm_start(unsigned int pwm_id, bool periodic)
-{
- unsigned long tcon;
-
- tcon = __raw_readl(S3C2410_TCON);
-
- switch (pwm_id) {
- case 2:
- tcon |= S3C2410_TCON_T2START;
- tcon &= ~S3C2410_TCON_T2MANUALUPD;
-
- if (periodic)
- tcon |= S3C2410_TCON_T2RELOAD;
- else
- tcon &= ~S3C2410_TCON_T2RELOAD;
- break;
- case 4:
- tcon |= S3C2410_TCON_T4START;
- tcon &= ~S3C2410_TCON_T4MANUALUPD;
-
- if (periodic)
- tcon |= S3C2410_TCON_T4RELOAD;
- else
- tcon &= ~S3C2410_TCON_T4RELOAD;
- break;
- default:
- break;
- }
- __raw_writel(tcon, S3C2410_TCON);
-}
-
-static int exynos4_pwm_set_next_event(unsigned long cycles,
- struct clock_event_device *evt)
-{
- exynos4_pwm_init(2, cycles);
- exynos4_pwm_start(2, 0);
- return 0;
-}
-
-static void exynos4_pwm_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
- exynos4_pwm_stop(2);
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- exynos4_pwm_init(2, clock_count_per_tick);
- exynos4_pwm_start(2, 1);
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- break;
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_RESUME:
- break;
- }
-}
-
-static struct clock_event_device pwm_event_device = {
- .name = "pwm_timer2",
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
- .rating = 200,
- .shift = 32,
- .set_next_event = exynos4_pwm_set_next_event,
- .set_mode = exynos4_pwm_set_mode,
-};
-
-irqreturn_t exynos4_clock_event_isr(int irq, void *dev_id)
-{
- struct clock_event_device *evt = &pwm_event_device;
-
- evt->event_handler(evt);
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction exynos4_clock_event_irq = {
- .name = "pwm_timer2_irq",
- .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
- .handler = exynos4_clock_event_isr,
-};
-
-static void __init exynos4_clockevent_init(void)
-{
- unsigned long pclk;
- unsigned long clock_rate;
- struct clk *tscaler;
-
- pclk = clk_get_rate(timerclk);
-
- /* configure clock tick */
-
- tscaler = clk_get_parent(tdiv2);
-
- clk_set_rate(tscaler, pclk / 2);
- clk_set_rate(tdiv2, pclk / 2);
- clk_set_parent(tin2, tdiv2);
-
- clock_rate = clk_get_rate(tin2);
-
- clock_count_per_tick = clock_rate / HZ;
-
- pwm_event_device.mult =
- div_sc(clock_rate, NSEC_PER_SEC, pwm_event_device.shift);
- pwm_event_device.max_delta_ns =
- clockevent_delta2ns(-1, &pwm_event_device);
- pwm_event_device.min_delta_ns =
- clockevent_delta2ns(1, &pwm_event_device);
-
- pwm_event_device.cpumask = cpumask_of(0);
- clockevents_register_device(&pwm_event_device);
-
- setup_irq(IRQ_TIMER2, &exynos4_clock_event_irq);
-}
-
-static cycle_t exynos4_pwm4_read(struct clocksource *cs)
-{
- return (cycle_t) ~__raw_readl(S3C_TIMERREG(0x40));
-}
-
-#ifdef CONFIG_PM
-static void exynos4_pwm4_resume(struct clocksource *cs)
-{
- unsigned long pclk;
-
- pclk = clk_get_rate(timerclk);
-
- clk_set_rate(tdiv4, pclk / 2);
- clk_set_parent(tin4, tdiv4);
-
- exynos4_pwm_init(4, ~0);
- exynos4_pwm_start(4, 1);
-}
-#endif
-
-struct clocksource pwm_clocksource = {
- .name = "pwm_timer4",
- .rating = 250,
- .read = exynos4_pwm4_read,
- .mask = CLOCKSOURCE_MASK(32),
- .flags = CLOCK_SOURCE_IS_CONTINUOUS ,
-#ifdef CONFIG_PM
- .resume = exynos4_pwm4_resume,
-#endif
-};
-
-static void __init exynos4_clocksource_init(void)
-{
- unsigned long pclk;
- unsigned long clock_rate;
-
- pclk = clk_get_rate(timerclk);
-
- clk_set_rate(tdiv4, pclk / 2);
- clk_set_parent(tin4, tdiv4);
-
- clock_rate = clk_get_rate(tin4);
-
- exynos4_pwm_init(4, ~0);
- exynos4_pwm_start(4, 1);
-
- if (clocksource_register_hz(&pwm_clocksource, clock_rate))
- panic("%s: can't register clocksource\n", pwm_clocksource.name);
-}
-
-static void __init exynos4_timer_resources(void)
-{
- struct platform_device tmpdev;
-
- tmpdev.dev.bus = &platform_bus_type;
-
- timerclk = clk_get(NULL, "timers");
- if (IS_ERR(timerclk))
- panic("failed to get timers clock for system timer");
-
- clk_enable(timerclk);
-
- tmpdev.id = 2;
- tin2 = clk_get(&tmpdev.dev, "pwm-tin");
- if (IS_ERR(tin2))
- panic("failed to get pwm-tin2 clock for system timer");
-
- tdiv2 = clk_get(&tmpdev.dev, "pwm-tdiv");
- if (IS_ERR(tdiv2))
- panic("failed to get pwm-tdiv2 clock for system timer");
- clk_enable(tin2);
-
- tmpdev.id = 4;
- tin4 = clk_get(&tmpdev.dev, "pwm-tin");
- if (IS_ERR(tin4))
- panic("failed to get pwm-tin4 clock for system timer");
-
- tdiv4 = clk_get(&tmpdev.dev, "pwm-tdiv");
- if (IS_ERR(tdiv4))
- panic("failed to get pwm-tdiv4 clock for system timer");
-
- clk_enable(tin4);
-}
-
-static void __init exynos4_timer_init(void)
-{
-#ifdef CONFIG_LOCAL_TIMERS
- twd_base = S5P_VA_TWD;
-#endif
-
- exynos4_timer_resources();
- exynos4_clockevent_init();
- exynos4_clocksource_init();
-}
-
-struct sys_timer exynos4_timer = {
- .init = exynos4_timer_init,
-};