diff options
Diffstat (limited to 'arch/blackfin/kernel/time-ts.c')
| -rw-r--r-- | arch/blackfin/kernel/time-ts.c | 400 |
1 files changed, 0 insertions, 400 deletions
diff --git a/arch/blackfin/kernel/time-ts.c b/arch/blackfin/kernel/time-ts.c deleted file mode 100644 index 0135055..0000000 --- a/arch/blackfin/kernel/time-ts.c +++ /dev/null @@ -1,400 +0,0 @@ -/* - * Based on arm clockevents implementation and old bfin time tick. - * - * Copyright 2008-2009 Analog Devics Inc. - * 2008 GeoTechnologies - * Vitja Makarov - * - * Licensed under the GPL-2 - */ - -#include <linux/module.h> -#include <linux/profile.h> -#include <linux/interrupt.h> -#include <linux/time.h> -#include <linux/timex.h> -#include <linux/irq.h> -#include <linux/clocksource.h> -#include <linux/clockchips.h> -#include <linux/cpufreq.h> - -#include <asm/blackfin.h> -#include <asm/time.h> -#include <asm/gptimers.h> -#include <asm/nmi.h> - - -#if defined(CONFIG_CYCLES_CLOCKSOURCE) - -static notrace u64 bfin_read_cycles(struct clocksource *cs) -{ -#ifdef CONFIG_CPU_FREQ - return __bfin_cycles_off + (get_cycles() << __bfin_cycles_mod); -#else - return get_cycles(); -#endif -} - -static struct clocksource bfin_cs_cycles = { - .name = "bfin_cs_cycles", - .rating = 400, - .read = bfin_read_cycles, - .mask = CLOCKSOURCE_MASK(64), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -static inline unsigned long long bfin_cs_cycles_sched_clock(void) -{ - return clocksource_cyc2ns(bfin_read_cycles(&bfin_cs_cycles), - bfin_cs_cycles.mult, bfin_cs_cycles.shift); -} - -static int __init bfin_cs_cycles_init(void) -{ - if (clocksource_register_hz(&bfin_cs_cycles, get_cclk())) - panic("failed to register clocksource"); - - return 0; -} -#else -# define bfin_cs_cycles_init() -#endif - -#ifdef CONFIG_GPTMR0_CLOCKSOURCE - -void __init setup_gptimer0(void) -{ - disable_gptimers(TIMER0bit); - -#ifdef CONFIG_BF60x - bfin_write16(TIMER_DATA_IMSK, 0); - set_gptimer_config(TIMER0_id, TIMER_OUT_DIS - | TIMER_MODE_PWM_CONT | TIMER_PULSE_HI | TIMER_IRQ_PER); -#else - set_gptimer_config(TIMER0_id, \ - TIMER_OUT_DIS | TIMER_PERIOD_CNT | TIMER_MODE_PWM); -#endif - set_gptimer_period(TIMER0_id, -1); - set_gptimer_pwidth(TIMER0_id, -2); - SSYNC(); - enable_gptimers(TIMER0bit); -} - -static u64 bfin_read_gptimer0(struct clocksource *cs) -{ - return bfin_read_TIMER0_COUNTER(); -} - -static struct clocksource bfin_cs_gptimer0 = { - .name = "bfin_cs_gptimer0", - .rating = 350, - .read = bfin_read_gptimer0, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -static inline unsigned long long bfin_cs_gptimer0_sched_clock(void) -{ - return clocksource_cyc2ns(bfin_read_TIMER0_COUNTER(), - bfin_cs_gptimer0.mult, bfin_cs_gptimer0.shift); -} - -static int __init bfin_cs_gptimer0_init(void) -{ - setup_gptimer0(); - - if (clocksource_register_hz(&bfin_cs_gptimer0, get_sclk())) - panic("failed to register clocksource"); - - return 0; -} -#else -# define bfin_cs_gptimer0_init() -#endif - -#if defined(CONFIG_GPTMR0_CLOCKSOURCE) || defined(CONFIG_CYCLES_CLOCKSOURCE) -/* prefer to use cycles since it has higher rating */ -notrace unsigned long long sched_clock(void) -{ -#if defined(CONFIG_CYCLES_CLOCKSOURCE) - return bfin_cs_cycles_sched_clock(); -#else - return bfin_cs_gptimer0_sched_clock(); -#endif -} -#endif - -#if defined(CONFIG_TICKSOURCE_GPTMR0) -static int bfin_gptmr0_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - disable_gptimers(TIMER0bit); - - /* it starts counting three SCLK cycles after the TIMENx bit is set */ - set_gptimer_pwidth(TIMER0_id, cycles - 3); - enable_gptimers(TIMER0bit); - return 0; -} - -static int bfin_gptmr0_set_periodic(struct clock_event_device *evt) -{ -#ifndef CONFIG_BF60x - set_gptimer_config(TIMER0_id, - TIMER_OUT_DIS | TIMER_IRQ_ENA | - TIMER_PERIOD_CNT | TIMER_MODE_PWM); -#else - set_gptimer_config(TIMER0_id, - TIMER_OUT_DIS | TIMER_MODE_PWM_CONT | - TIMER_PULSE_HI | TIMER_IRQ_PER); -#endif - - set_gptimer_period(TIMER0_id, get_sclk() / HZ); - set_gptimer_pwidth(TIMER0_id, get_sclk() / HZ - 1); - enable_gptimers(TIMER0bit); - return 0; -} - -static int bfin_gptmr0_set_oneshot(struct clock_event_device *evt) -{ - disable_gptimers(TIMER0bit); -#ifndef CONFIG_BF60x - set_gptimer_config(TIMER0_id, - TIMER_OUT_DIS | TIMER_IRQ_ENA | TIMER_MODE_PWM); -#else - set_gptimer_config(TIMER0_id, - TIMER_OUT_DIS | TIMER_MODE_PWM | TIMER_PULSE_HI | - TIMER_IRQ_WID_DLY); -#endif - - set_gptimer_period(TIMER0_id, 0); - return 0; -} - -static int bfin_gptmr0_shutdown(struct clock_event_device *evt) -{ - disable_gptimers(TIMER0bit); - return 0; -} - -static void bfin_gptmr0_ack(void) -{ - clear_gptimer_intr(TIMER0_id); -} - -static void __init bfin_gptmr0_init(void) -{ - disable_gptimers(TIMER0bit); -} - -#ifdef CONFIG_CORE_TIMER_IRQ_L1 -__attribute__((l1_text)) -#endif -irqreturn_t bfin_gptmr0_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evt = dev_id; - smp_mb(); - /* - * We want to ACK before we handle so that we can handle smaller timer - * intervals. This way if the timer expires again while we're handling - * things, we're more likely to see that 2nd int rather than swallowing - * it by ACKing the int at the end of this handler. - */ - bfin_gptmr0_ack(); - evt->event_handler(evt); - return IRQ_HANDLED; -} - -static struct irqaction gptmr0_irq = { - .name = "Blackfin GPTimer0", - .flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_PERCPU, - .handler = bfin_gptmr0_interrupt, -}; - -static struct clock_event_device clockevent_gptmr0 = { - .name = "bfin_gptimer0", - .rating = 300, - .irq = IRQ_TIMER0, - .shift = 32, - .features = CLOCK_EVT_FEAT_PERIODIC | - CLOCK_EVT_FEAT_ONESHOT, - .set_next_event = bfin_gptmr0_set_next_event, - .set_state_shutdown = bfin_gptmr0_shutdown, - .set_state_periodic = bfin_gptmr0_set_periodic, - .set_state_oneshot = bfin_gptmr0_set_oneshot, -}; - -static void __init bfin_gptmr0_clockevent_init(struct clock_event_device *evt) -{ - unsigned long clock_tick; - - clock_tick = get_sclk(); - evt->mult = div_sc(clock_tick, NSEC_PER_SEC, evt->shift); - evt->max_delta_ns = clockevent_delta2ns(-1, evt); - evt->max_delta_ticks = (unsigned long)-1; - evt->min_delta_ns = clockevent_delta2ns(100, evt); - evt->min_delta_ticks = 100; - - evt->cpumask = cpumask_of(0); - - clockevents_register_device(evt); -} -#endif /* CONFIG_TICKSOURCE_GPTMR0 */ - -#if defined(CONFIG_TICKSOURCE_CORETMR) -/* per-cpu local core timer */ -DEFINE_PER_CPU(struct clock_event_device, coretmr_events); - -static int bfin_coretmr_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - bfin_write_TCNTL(TMPWR); - CSYNC(); - bfin_write_TCOUNT(cycles); - CSYNC(); - bfin_write_TCNTL(TMPWR | TMREN); - return 0; -} - -static int bfin_coretmr_set_periodic(struct clock_event_device *evt) -{ - unsigned long tcount = ((get_cclk() / (HZ * TIME_SCALE)) - 1); - - bfin_write_TCNTL(TMPWR); - CSYNC(); - bfin_write_TSCALE(TIME_SCALE - 1); - bfin_write_TPERIOD(tcount); - bfin_write_TCOUNT(tcount); - CSYNC(); - bfin_write_TCNTL(TMPWR | TMREN | TAUTORLD); - return 0; -} - -static int bfin_coretmr_set_oneshot(struct clock_event_device *evt) -{ - bfin_write_TCNTL(TMPWR); - CSYNC(); - bfin_write_TSCALE(TIME_SCALE - 1); - bfin_write_TPERIOD(0); - bfin_write_TCOUNT(0); - return 0; -} - -static int bfin_coretmr_shutdown(struct clock_event_device *evt) -{ - bfin_write_TCNTL(0); - CSYNC(); - return 0; -} - -void bfin_coretmr_init(void) -{ - /* power up the timer, but don't enable it just yet */ - bfin_write_TCNTL(TMPWR); - CSYNC(); - - /* the TSCALE prescaler counter. */ - bfin_write_TSCALE(TIME_SCALE - 1); - bfin_write_TPERIOD(0); - bfin_write_TCOUNT(0); - - CSYNC(); -} - -#ifdef CONFIG_CORE_TIMER_IRQ_L1 -__attribute__((l1_text)) -#endif - -irqreturn_t bfin_coretmr_interrupt(int irq, void *dev_id) -{ - int cpu = smp_processor_id(); - struct clock_event_device *evt = &per_cpu(coretmr_events, cpu); - - smp_mb(); - evt->event_handler(evt); - - touch_nmi_watchdog(); - - return IRQ_HANDLED; -} - -static struct irqaction coretmr_irq = { - .name = "Blackfin CoreTimer", - .flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_PERCPU, - .handler = bfin_coretmr_interrupt, -}; - -void bfin_coretmr_clockevent_init(void) -{ - unsigned long clock_tick; - unsigned int cpu = smp_processor_id(); - struct clock_event_device *evt = &per_cpu(coretmr_events, cpu); - -#ifdef CONFIG_SMP - evt->broadcast = smp_timer_broadcast; -#endif - - evt->name = "bfin_core_timer"; - evt->rating = 350; - evt->irq = -1; - evt->shift = 32; - evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - evt->set_next_event = bfin_coretmr_set_next_event; - evt->set_state_shutdown = bfin_coretmr_shutdown; - evt->set_state_periodic = bfin_coretmr_set_periodic; - evt->set_state_oneshot = bfin_coretmr_set_oneshot; - - clock_tick = get_cclk() / TIME_SCALE; - evt->mult = div_sc(clock_tick, NSEC_PER_SEC, evt->shift); - evt->max_delta_ns = clockevent_delta2ns(-1, evt); - evt->max_delta_ticks = (unsigned long)-1; - evt->min_delta_ns = clockevent_delta2ns(100, evt); - evt->min_delta_ticks = 100; - - evt->cpumask = cpumask_of(cpu); - - clockevents_register_device(evt); -} -#endif /* CONFIG_TICKSOURCE_CORETMR */ - - -void read_persistent_clock(struct timespec *ts) -{ - time_t secs_since_1970 = (365 * 37 + 9) * 24 * 60 * 60; /* 1 Jan 2007 */ - ts->tv_sec = secs_since_1970; - ts->tv_nsec = 0; -} - -void __init time_init(void) -{ - -#ifdef CONFIG_RTC_DRV_BFIN - /* [#2663] hack to filter junk RTC values that would cause - * userspace to have to deal with time values greater than - * 2^31 seconds (which uClibc cannot cope with yet) - */ - if ((bfin_read_RTC_STAT() & 0xC0000000) == 0xC0000000) { - printk(KERN_NOTICE "bfin-rtc: invalid date; resetting\n"); - bfin_write_RTC_STAT(0); - } -#endif - - bfin_cs_cycles_init(); - bfin_cs_gptimer0_init(); - -#if defined(CONFIG_TICKSOURCE_CORETMR) - bfin_coretmr_init(); - setup_irq(IRQ_CORETMR, &coretmr_irq); - bfin_coretmr_clockevent_init(); -#endif - -#if defined(CONFIG_TICKSOURCE_GPTMR0) - bfin_gptmr0_init(); - setup_irq(IRQ_TIMER0, &gptmr0_irq); - gptmr0_irq.dev_id = &clockevent_gptmr0; - bfin_gptmr0_clockevent_init(&clockevent_gptmr0); -#endif - -#if !defined(CONFIG_TICKSOURCE_CORETMR) && !defined(CONFIG_TICKSOURCE_GPTMR0) -# error at least one clock event device is required -#endif -} |
