diff options
Diffstat (limited to 'arch/arm/mach-exynos/mct.c')
| -rw-r--r-- | arch/arm/mach-exynos/mct.c | 479 |
1 files changed, 0 insertions, 479 deletions
diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c deleted file mode 100644 index 04aff6a61e8..00000000000 --- a/arch/arm/mach-exynos/mct.c +++ /dev/null @@ -1,479 +0,0 @@ -/* linux/arch/arm/mach-exynos4/mct.c - * - * Copyright (c) 2011 Samsung Electronics Co., Ltd. - * http://www.samsung.com - * - * EXYNOS4 MCT(Multi-Core Timer) support - * - * 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 <linux/delay.h> -#include <linux/percpu.h> -#include <linux/of.h> - -#include <asm/localtimer.h> - -#include <plat/cpu.h> - -#include <mach/map.h> -#include <mach/irqs.h> -#include <mach/regs-mct.h> -#include <asm/mach/time.h> - -#define TICK_BASE_CNT 1 - -enum { - MCT_INT_SPI, - MCT_INT_PPI -}; - -static unsigned long clk_rate; -static unsigned int mct_int_type; - -struct mct_clock_event_device { - struct clock_event_device *evt; - void __iomem *base; - char name[10]; -}; - -static void exynos4_mct_write(unsigned int value, void *addr) -{ - void __iomem *stat_addr; - u32 mask; - u32 i; - - __raw_writel(value, addr); - - if (likely(addr >= EXYNOS4_MCT_L_BASE(0))) { - u32 base = (u32) addr & EXYNOS4_MCT_L_MASK; - switch ((u32) addr & ~EXYNOS4_MCT_L_MASK) { - case (u32) MCT_L_TCON_OFFSET: - stat_addr = (void __iomem *) base + MCT_L_WSTAT_OFFSET; - mask = 1 << 3; /* L_TCON write status */ - break; - case (u32) MCT_L_ICNTB_OFFSET: - stat_addr = (void __iomem *) base + MCT_L_WSTAT_OFFSET; - mask = 1 << 1; /* L_ICNTB write status */ - break; - case (u32) MCT_L_TCNTB_OFFSET: - stat_addr = (void __iomem *) base + MCT_L_WSTAT_OFFSET; - mask = 1 << 0; /* L_TCNTB write status */ - break; - default: - return; - } - } else { - switch ((u32) addr) { - case (u32) EXYNOS4_MCT_G_TCON: - stat_addr = EXYNOS4_MCT_G_WSTAT; - mask = 1 << 16; /* G_TCON write status */ - break; - case (u32) EXYNOS4_MCT_G_COMP0_L: - stat_addr = EXYNOS4_MCT_G_WSTAT; - mask = 1 << 0; /* G_COMP0_L write status */ - break; - case (u32) EXYNOS4_MCT_G_COMP0_U: - stat_addr = EXYNOS4_MCT_G_WSTAT; - mask = 1 << 1; /* G_COMP0_U write status */ - break; - case (u32) EXYNOS4_MCT_G_COMP0_ADD_INCR: - stat_addr = EXYNOS4_MCT_G_WSTAT; - mask = 1 << 2; /* G_COMP0_ADD_INCR w status */ - break; - case (u32) EXYNOS4_MCT_G_CNT_L: - stat_addr = EXYNOS4_MCT_G_CNT_WSTAT; - mask = 1 << 0; /* G_CNT_L write status */ - break; - case (u32) EXYNOS4_MCT_G_CNT_U: - stat_addr = EXYNOS4_MCT_G_CNT_WSTAT; - mask = 1 << 1; /* G_CNT_U write status */ - break; - default: - return; - } - } - - /* Wait maximum 1 ms until written values are applied */ - for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++) - if (__raw_readl(stat_addr) & mask) { - __raw_writel(mask, stat_addr); - return; - } - - panic("MCT hangs after writing %d (addr:0x%08x)\n", value, (u32)addr); -} - -/* Clocksource handling */ -static void exynos4_mct_frc_start(u32 hi, u32 lo) -{ - u32 reg; - - exynos4_mct_write(lo, EXYNOS4_MCT_G_CNT_L); - exynos4_mct_write(hi, EXYNOS4_MCT_G_CNT_U); - - reg = __raw_readl(EXYNOS4_MCT_G_TCON); - reg |= MCT_G_TCON_START; - exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON); -} - -static cycle_t exynos4_frc_read(struct clocksource *cs) -{ - unsigned int lo, hi; - u32 hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U); - - do { - hi = hi2; - lo = __raw_readl(EXYNOS4_MCT_G_CNT_L); - hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U); - } while (hi != hi2); - - return ((cycle_t)hi << 32) | lo; -} - -static void exynos4_frc_resume(struct clocksource *cs) -{ - exynos4_mct_frc_start(0, 0); -} - -struct clocksource mct_frc = { - .name = "mct-frc", - .rating = 400, - .read = exynos4_frc_read, - .mask = CLOCKSOURCE_MASK(64), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, - .resume = exynos4_frc_resume, -}; - -static void __init exynos4_clocksource_init(void) -{ - exynos4_mct_frc_start(0, 0); - - if (clocksource_register_hz(&mct_frc, clk_rate)) - panic("%s: can't register clocksource\n", mct_frc.name); -} - -static void exynos4_mct_comp0_stop(void) -{ - unsigned int tcon; - - tcon = __raw_readl(EXYNOS4_MCT_G_TCON); - tcon &= ~(MCT_G_TCON_COMP0_ENABLE | MCT_G_TCON_COMP0_AUTO_INC); - - exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON); - exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB); -} - -static void exynos4_mct_comp0_start(enum clock_event_mode mode, - unsigned long cycles) -{ - unsigned int tcon; - cycle_t comp_cycle; - - tcon = __raw_readl(EXYNOS4_MCT_G_TCON); - - if (mode == CLOCK_EVT_MODE_PERIODIC) { - tcon |= MCT_G_TCON_COMP0_AUTO_INC; - exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR); - } - - comp_cycle = exynos4_frc_read(&mct_frc) + cycles; - exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L); - exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U); - - exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB); - - tcon |= MCT_G_TCON_COMP0_ENABLE; - exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON); -} - -static int exynos4_comp_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - exynos4_mct_comp0_start(evt->mode, cycles); - - return 0; -} - -static void exynos4_comp_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - unsigned long cycles_per_jiffy; - exynos4_mct_comp0_stop(); - - switch (mode) { - case CLOCK_EVT_MODE_PERIODIC: - cycles_per_jiffy = - (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift); - exynos4_mct_comp0_start(mode, cycles_per_jiffy); - break; - - case CLOCK_EVT_MODE_ONESHOT: - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - case CLOCK_EVT_MODE_RESUME: - break; - } -} - -static struct clock_event_device mct_comp_device = { - .name = "mct-comp", - .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, - .rating = 250, - .set_next_event = exynos4_comp_set_next_event, - .set_mode = exynos4_comp_set_mode, -}; - -static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id) -{ - struct clock_event_device *evt = dev_id; - - exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT); - - evt->event_handler(evt); - - return IRQ_HANDLED; -} - -static struct irqaction mct_comp_event_irq = { - .name = "mct_comp_irq", - .flags = IRQF_TIMER | IRQF_IRQPOLL, - .handler = exynos4_mct_comp_isr, - .dev_id = &mct_comp_device, -}; - -static void exynos4_clockevent_init(void) -{ - mct_comp_device.cpumask = cpumask_of(0); - clockevents_config_and_register(&mct_comp_device, clk_rate, - 0xf, 0xffffffff); - - if (soc_is_exynos5250()) - setup_irq(EXYNOS5_IRQ_MCT_G0, &mct_comp_event_irq); - else - setup_irq(EXYNOS4_IRQ_MCT_G0, &mct_comp_event_irq); -} - -#ifdef CONFIG_LOCAL_TIMERS - -static DEFINE_PER_CPU(struct mct_clock_event_device, percpu_mct_tick); - -/* Clock event handling */ -static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt) -{ - unsigned long tmp; - unsigned long mask = MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START; - void __iomem *addr = mevt->base + MCT_L_TCON_OFFSET; - - tmp = __raw_readl(addr); - if (tmp & mask) { - tmp &= ~mask; - exynos4_mct_write(tmp, addr); - } -} - -static void exynos4_mct_tick_start(unsigned long cycles, - struct mct_clock_event_device *mevt) -{ - unsigned long tmp; - - exynos4_mct_tick_stop(mevt); - - tmp = (1 << 31) | cycles; /* MCT_L_UPDATE_ICNTB */ - - /* update interrupt count buffer */ - exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET); - - /* enable MCT tick interrupt */ - exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET); - - tmp = __raw_readl(mevt->base + MCT_L_TCON_OFFSET); - tmp |= MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START | - MCT_L_TCON_INTERVAL_MODE; - exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET); -} - -static int exynos4_tick_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); - - exynos4_mct_tick_start(cycles, mevt); - - return 0; -} - -static inline void exynos4_tick_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick); - unsigned long cycles_per_jiffy; - - exynos4_mct_tick_stop(mevt); - - switch (mode) { - case CLOCK_EVT_MODE_PERIODIC: - cycles_per_jiffy = - (((unsigned long long) NSEC_PER_SEC / HZ * evt->mult) >> evt->shift); - exynos4_mct_tick_start(cycles_per_jiffy, mevt); - break; - - case CLOCK_EVT_MODE_ONESHOT: - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - case CLOCK_EVT_MODE_RESUME: - break; - } -} - -static int exynos4_mct_tick_clear(struct mct_clock_event_device *mevt) -{ - struct clock_event_device *evt = mevt->evt; - - /* - * This is for supporting oneshot mode. - * Mct would generate interrupt periodically - * without explicit stopping. - */ - if (evt->mode != CLOCK_EVT_MODE_PERIODIC) - exynos4_mct_tick_stop(mevt); - - /* Clear the MCT tick interrupt */ - if (__raw_readl(mevt->base + MCT_L_INT_CSTAT_OFFSET) & 1) { - exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET); - return 1; - } else { - return 0; - } -} - -static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id) -{ - struct mct_clock_event_device *mevt = dev_id; - struct clock_event_device *evt = mevt->evt; - - exynos4_mct_tick_clear(mevt); - - evt->event_handler(evt); - - return IRQ_HANDLED; -} - -static struct irqaction mct_tick0_event_irq = { - .name = "mct_tick0_irq", - .flags = IRQF_TIMER | IRQF_NOBALANCING, - .handler = exynos4_mct_tick_isr, -}; - -static struct irqaction mct_tick1_event_irq = { - .name = "mct_tick1_irq", - .flags = IRQF_TIMER | IRQF_NOBALANCING, - .handler = exynos4_mct_tick_isr, -}; - -static int __cpuinit exynos4_local_timer_setup(struct clock_event_device *evt) -{ - struct mct_clock_event_device *mevt; - unsigned int cpu = smp_processor_id(); - int mct_lx_irq; - - mevt = this_cpu_ptr(&percpu_mct_tick); - mevt->evt = evt; - - mevt->base = EXYNOS4_MCT_L_BASE(cpu); - sprintf(mevt->name, "mct_tick%d", cpu); - - evt->name = mevt->name; - evt->cpumask = cpumask_of(cpu); - evt->set_next_event = exynos4_tick_set_next_event; - evt->set_mode = exynos4_tick_set_mode; - evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - evt->rating = 450; - clockevents_config_and_register(evt, clk_rate / (TICK_BASE_CNT + 1), - 0xf, 0x7fffffff); - - exynos4_mct_write(TICK_BASE_CNT, mevt->base + MCT_L_TCNTB_OFFSET); - - if (mct_int_type == MCT_INT_SPI) { - if (cpu == 0) { - mct_lx_irq = soc_is_exynos4210() ? EXYNOS4_IRQ_MCT_L0 : - EXYNOS5_IRQ_MCT_L0; - mct_tick0_event_irq.dev_id = mevt; - evt->irq = mct_lx_irq; - setup_irq(mct_lx_irq, &mct_tick0_event_irq); - } else { - mct_lx_irq = soc_is_exynos4210() ? EXYNOS4_IRQ_MCT_L1 : - EXYNOS5_IRQ_MCT_L1; - mct_tick1_event_irq.dev_id = mevt; - evt->irq = mct_lx_irq; - setup_irq(mct_lx_irq, &mct_tick1_event_irq); - irq_set_affinity(mct_lx_irq, cpumask_of(1)); - } - } else { - enable_percpu_irq(EXYNOS_IRQ_MCT_LOCALTIMER, 0); - } - - return 0; -} - -static void exynos4_local_timer_stop(struct clock_event_device *evt) -{ - unsigned int cpu = smp_processor_id(); - evt->set_mode(CLOCK_EVT_MODE_UNUSED, evt); - if (mct_int_type == MCT_INT_SPI) - if (cpu == 0) - remove_irq(evt->irq, &mct_tick0_event_irq); - else - remove_irq(evt->irq, &mct_tick1_event_irq); - else - disable_percpu_irq(EXYNOS_IRQ_MCT_LOCALTIMER); -} - -static struct local_timer_ops exynos4_mct_tick_ops __cpuinitdata = { - .setup = exynos4_local_timer_setup, - .stop = exynos4_local_timer_stop, -}; -#endif /* CONFIG_LOCAL_TIMERS */ - -static void __init exynos4_timer_resources(void) -{ - struct clk *mct_clk; - mct_clk = clk_get(NULL, "xtal"); - - clk_rate = clk_get_rate(mct_clk); - -#ifdef CONFIG_LOCAL_TIMERS - if (mct_int_type == MCT_INT_PPI) { - int err; - - err = request_percpu_irq(EXYNOS_IRQ_MCT_LOCALTIMER, - exynos4_mct_tick_isr, "MCT", - &percpu_mct_tick); - WARN(err, "MCT: can't request IRQ %d (%d)\n", - EXYNOS_IRQ_MCT_LOCALTIMER, err); - } - - local_timer_register(&exynos4_mct_tick_ops); -#endif /* CONFIG_LOCAL_TIMERS */ -} - -void __init exynos4_timer_init(void) -{ - if ((soc_is_exynos4210()) || (soc_is_exynos5250())) - mct_int_type = MCT_INT_SPI; - else - mct_int_type = MCT_INT_PPI; - - exynos4_timer_resources(); - exynos4_clocksource_init(); - exynos4_clockevent_init(); -} |