diff options
Diffstat (limited to 'arch/avr32/kernel/time.c')
-rw-r--r-- | arch/avr32/kernel/time.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/arch/avr32/kernel/time.c b/arch/avr32/kernel/time.c deleted file mode 100644 index 4d9b69615979..000000000000 --- a/arch/avr32/kernel/time.c +++ /dev/null @@ -1,161 +0,0 @@ -/* - * Copyright (C) 2004-2007 Atmel Corporation - * - * 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/clk.h> -#include <linux/clockchips.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/kernel.h> -#include <linux/time.h> -#include <linux/cpu.h> - -#include <asm/sysreg.h> - -#include <mach/pm.h> - -static bool disable_cpu_idle_poll; - -static u64 read_cycle_count(struct clocksource *cs) -{ - return (u64)sysreg_read(COUNT); -} - -/* - * The architectural cycle count registers are a fine clocksource unless - * the system idle loop use sleep states like "idle": the CPU cycles - * measured by COUNT (and COMPARE) don't happen during sleep states. - * Their duration also changes if cpufreq changes the CPU clock rate. - * So we rate the clocksource using COUNT as very low quality. - */ -static struct clocksource counter = { - .name = "avr32_counter", - .rating = 50, - .read = read_cycle_count, - .mask = CLOCKSOURCE_MASK(32), - .flags = CLOCK_SOURCE_IS_CONTINUOUS, -}; - -static irqreturn_t timer_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evdev = dev_id; - - if (unlikely(!(intc_get_pending(0) & 1))) - return IRQ_NONE; - - /* - * Disable the interrupt until the clockevent subsystem - * reprograms it. - */ - sysreg_write(COMPARE, 0); - - evdev->event_handler(evdev); - return IRQ_HANDLED; -} - -static struct irqaction timer_irqaction = { - .handler = timer_interrupt, - /* Oprofile uses the same irq as the timer, so allow it to be shared */ - .flags = IRQF_TIMER | IRQF_SHARED, - .name = "avr32_comparator", -}; - -static int comparator_next_event(unsigned long delta, - struct clock_event_device *evdev) -{ - unsigned long flags; - - raw_local_irq_save(flags); - - /* The time to read COUNT then update COMPARE must be less - * than the min_delta_ns value for this clockevent source. - */ - sysreg_write(COMPARE, (sysreg_read(COUNT) + delta) ? : 1); - - raw_local_irq_restore(flags); - - return 0; -} - -static int comparator_shutdown(struct clock_event_device *evdev) -{ - pr_debug("%s: %s\n", __func__, evdev->name); - sysreg_write(COMPARE, 0); - - if (disable_cpu_idle_poll) { - disable_cpu_idle_poll = false; - /* - * Only disable idle poll if we have forced that - * in a previous call. - */ - cpu_idle_poll_ctrl(false); - } - return 0; -} - -static int comparator_set_oneshot(struct clock_event_device *evdev) -{ - pr_debug("%s: %s\n", __func__, evdev->name); - - disable_cpu_idle_poll = true; - /* - * If we're using the COUNT and COMPARE registers we - * need to force idle poll. - */ - cpu_idle_poll_ctrl(true); - - return 0; -} - -static struct clock_event_device comparator = { - .name = "avr32_comparator", - .features = CLOCK_EVT_FEAT_ONESHOT, - .shift = 16, - .rating = 50, - .set_next_event = comparator_next_event, - .set_state_shutdown = comparator_shutdown, - .set_state_oneshot = comparator_set_oneshot, - .tick_resume = comparator_set_oneshot, -}; - -void read_persistent_clock(struct timespec *ts) -{ - ts->tv_sec = mktime(2007, 1, 1, 0, 0, 0); - ts->tv_nsec = 0; -} - -void __init time_init(void) -{ - unsigned long counter_hz; - int ret; - - /* figure rate for counter */ - counter_hz = clk_get_rate(boot_cpu_data.clk); - ret = clocksource_register_hz(&counter, counter_hz); - if (ret) - pr_debug("timer: could not register clocksource: %d\n", ret); - - /* setup COMPARE clockevent */ - comparator.mult = div_sc(counter_hz, NSEC_PER_SEC, comparator.shift); - comparator.max_delta_ns = clockevent_delta2ns((u32)~0, &comparator); - comparator.min_delta_ns = clockevent_delta2ns(50, &comparator) + 1; - comparator.cpumask = cpumask_of(0); - - sysreg_write(COMPARE, 0); - timer_irqaction.dev_id = &comparator; - - ret = setup_irq(0, &timer_irqaction); - if (ret) - pr_debug("timer: could not request IRQ 0: %d\n", ret); - else { - clockevents_register_device(&comparator); - - pr_info("%s: irq 0, %lu.%03lu MHz\n", comparator.name, - ((counter_hz + 500) / 1000) / 1000, - ((counter_hz + 500) / 1000) % 1000); - } -} |