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146 lines
3.4 KiB
146 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* GT641xx clockevent routines. |
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* |
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* Copyright (C) 2007 Yoichi Yuasa <[email protected]> |
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*/ |
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#include <linux/clockchips.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/spinlock.h> |
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#include <linux/irq.h> |
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#include <asm/gt64120.h> |
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#include <asm/time.h> |
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static DEFINE_RAW_SPINLOCK(gt641xx_timer_lock); |
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static unsigned int gt641xx_base_clock; |
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void gt641xx_set_base_clock(unsigned int clock) |
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{ |
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gt641xx_base_clock = clock; |
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} |
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int gt641xx_timer0_state(void) |
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{ |
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if (GT_READ(GT_TC0_OFS)) |
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return 0; |
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GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ); |
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GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK); |
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return 1; |
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} |
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static int gt641xx_timer0_set_next_event(unsigned long delta, |
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struct clock_event_device *evt) |
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{ |
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u32 ctrl; |
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raw_spin_lock(>641xx_timer_lock); |
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ctrl = GT_READ(GT_TC_CONTROL_OFS); |
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ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK); |
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ctrl |= GT_TC_CONTROL_ENTC0_MSK; |
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GT_WRITE(GT_TC0_OFS, delta); |
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GT_WRITE(GT_TC_CONTROL_OFS, ctrl); |
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raw_spin_unlock(>641xx_timer_lock); |
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return 0; |
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} |
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static int gt641xx_timer0_shutdown(struct clock_event_device *evt) |
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{ |
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u32 ctrl; |
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raw_spin_lock(>641xx_timer_lock); |
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ctrl = GT_READ(GT_TC_CONTROL_OFS); |
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ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK); |
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GT_WRITE(GT_TC_CONTROL_OFS, ctrl); |
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raw_spin_unlock(>641xx_timer_lock); |
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return 0; |
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} |
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static int gt641xx_timer0_set_oneshot(struct clock_event_device *evt) |
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{ |
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u32 ctrl; |
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raw_spin_lock(>641xx_timer_lock); |
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ctrl = GT_READ(GT_TC_CONTROL_OFS); |
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ctrl &= ~GT_TC_CONTROL_SELTC0_MSK; |
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ctrl |= GT_TC_CONTROL_ENTC0_MSK; |
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GT_WRITE(GT_TC_CONTROL_OFS, ctrl); |
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raw_spin_unlock(>641xx_timer_lock); |
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return 0; |
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} |
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static int gt641xx_timer0_set_periodic(struct clock_event_device *evt) |
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{ |
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u32 ctrl; |
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raw_spin_lock(>641xx_timer_lock); |
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ctrl = GT_READ(GT_TC_CONTROL_OFS); |
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ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK; |
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GT_WRITE(GT_TC_CONTROL_OFS, ctrl); |
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raw_spin_unlock(>641xx_timer_lock); |
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return 0; |
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} |
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static void gt641xx_timer0_event_handler(struct clock_event_device *dev) |
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{ |
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} |
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static struct clock_event_device gt641xx_timer0_clockevent = { |
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.name = "gt641xx-timer0", |
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.features = CLOCK_EVT_FEAT_PERIODIC | |
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CLOCK_EVT_FEAT_ONESHOT, |
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.irq = GT641XX_TIMER0_IRQ, |
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.set_next_event = gt641xx_timer0_set_next_event, |
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.set_state_shutdown = gt641xx_timer0_shutdown, |
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.set_state_periodic = gt641xx_timer0_set_periodic, |
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.set_state_oneshot = gt641xx_timer0_set_oneshot, |
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.tick_resume = gt641xx_timer0_shutdown, |
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.event_handler = gt641xx_timer0_event_handler, |
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}; |
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static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id) |
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{ |
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struct clock_event_device *cd = >641xx_timer0_clockevent; |
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cd->event_handler(cd); |
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return IRQ_HANDLED; |
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} |
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static int __init gt641xx_timer0_clockevent_init(void) |
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{ |
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struct clock_event_device *cd; |
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if (!gt641xx_base_clock) |
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return 0; |
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GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ); |
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cd = >641xx_timer0_clockevent; |
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cd->rating = 200 + gt641xx_base_clock / 10000000; |
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clockevent_set_clock(cd, gt641xx_base_clock); |
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cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd); |
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cd->max_delta_ticks = 0x7fffffff; |
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cd->min_delta_ns = clockevent_delta2ns(0x300, cd); |
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cd->min_delta_ticks = 0x300; |
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cd->cpumask = cpumask_of(0); |
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clockevents_register_device(>641xx_timer0_clockevent); |
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return request_irq(GT641XX_TIMER0_IRQ, gt641xx_timer0_interrupt, |
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IRQF_PERCPU | IRQF_TIMER, "gt641xx_timer0", NULL); |
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} |
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arch_initcall(gt641xx_timer0_clockevent_init);
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