1/*
  2 *  GT641xx clockevent routines.
  3 *
  4 *  Copyright (C) 2007	Yoichi Yuasa <yuasa@linux-mips.org>
  5 *
  6 *  This program is free software; you can redistribute it and/or modify
  7 *  it under the terms of the GNU General Public License as published by
  8 *  the Free Software Foundation; either version 2 of the License, or
  9 *  (at your option) any later version.
 10 *
 11 *  This program is distributed in the hope that it will be useful,
 12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 *  GNU General Public License for more details.
 15 *
 16 *  You should have received a copy of the GNU General Public License
 17 *  along with this program; if not, write to the Free Software
 18 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 19 */
 20#include <linux/clockchips.h>
 21#include <linux/init.h>
 22#include <linux/interrupt.h>
 23#include <linux/spinlock.h>
 24#include <linux/irq.h>
 25
 26#include <asm/gt64120.h>
 27#include <asm/time.h>
 28
 29static DEFINE_RAW_SPINLOCK(gt641xx_timer_lock);
 30static unsigned int gt641xx_base_clock;
 31
 32void gt641xx_set_base_clock(unsigned int clock)
 33{
 34	gt641xx_base_clock = clock;
 35}
 36
 37int gt641xx_timer0_state(void)
 38{
 39	if (GT_READ(GT_TC0_OFS))
 40		return 0;
 41
 42	GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
 43	GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK);
 44
 45	return 1;
 46}
 47
 48static int gt641xx_timer0_set_next_event(unsigned long delta,
 49					 struct clock_event_device *evt)
 50{
 51	u32 ctrl;
 52
 53	raw_spin_lock(&gt641xx_timer_lock);
 54
 55	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 56	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
 57	ctrl |= GT_TC_CONTROL_ENTC0_MSK;
 58
 59	GT_WRITE(GT_TC0_OFS, delta);
 60	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 61
 62	raw_spin_unlock(&gt641xx_timer_lock);
 63
 64	return 0;
 65}
 66
 67static int gt641xx_timer0_shutdown(struct clock_event_device *evt)
 68{
 69	u32 ctrl;
 70
 71	raw_spin_lock(&gt641xx_timer_lock);
 72
 73	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 74	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
 75	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 76
 77	raw_spin_unlock(&gt641xx_timer_lock);
 78	return 0;
 79}
 80
 81static int gt641xx_timer0_set_oneshot(struct clock_event_device *evt)
 82{
 83	u32 ctrl;
 84
 85	raw_spin_lock(&gt641xx_timer_lock);
 86
 87	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 88	ctrl &= ~GT_TC_CONTROL_SELTC0_MSK;
 89	ctrl |= GT_TC_CONTROL_ENTC0_MSK;
 90	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 91
 92	raw_spin_unlock(&gt641xx_timer_lock);
 93	return 0;
 94}
 95
 96static int gt641xx_timer0_set_periodic(struct clock_event_device *evt)
 97{
 98	u32 ctrl;
 99
100	raw_spin_lock(&gt641xx_timer_lock);
101
102	ctrl = GT_READ(GT_TC_CONTROL_OFS);
103	ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK;
104	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
105
106	raw_spin_unlock(&gt641xx_timer_lock);
107	return 0;
108}
109
110static void gt641xx_timer0_event_handler(struct clock_event_device *dev)
111{
112}
113
114static struct clock_event_device gt641xx_timer0_clockevent = {
115	.name			= "gt641xx-timer0",
116	.features		= CLOCK_EVT_FEAT_PERIODIC |
117				  CLOCK_EVT_FEAT_ONESHOT,
118	.irq			= GT641XX_TIMER0_IRQ,
119	.set_next_event		= gt641xx_timer0_set_next_event,
120	.set_state_shutdown	= gt641xx_timer0_shutdown,
121	.set_state_periodic	= gt641xx_timer0_set_periodic,
122	.set_state_oneshot	= gt641xx_timer0_set_oneshot,
123	.tick_resume		= gt641xx_timer0_shutdown,
124	.event_handler		= gt641xx_timer0_event_handler,
125};
126
127static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id)
128{
129	struct clock_event_device *cd = &gt641xx_timer0_clockevent;
130
131	cd->event_handler(cd);
132
133	return IRQ_HANDLED;
134}
135
136static struct irqaction gt641xx_timer0_irqaction = {
137	.handler	= gt641xx_timer0_interrupt,
138	.flags		= IRQF_PERCPU | IRQF_TIMER,
139	.name		= "gt641xx_timer0",
140};
141
142static int __init gt641xx_timer0_clockevent_init(void)
143{
144	struct clock_event_device *cd;
145
146	if (!gt641xx_base_clock)
147		return 0;
148
149	GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
150
151	cd = &gt641xx_timer0_clockevent;
152	cd->rating = 200 + gt641xx_base_clock / 10000000;
153	clockevent_set_clock(cd, gt641xx_base_clock);
154	cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
 
155	cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
 
156	cd->cpumask = cpumask_of(0);
157
158	clockevents_register_device(&gt641xx_timer0_clockevent);
159
160	return setup_irq(GT641XX_TIMER0_IRQ, &gt641xx_timer0_irqaction);
161}
162arch_initcall(gt641xx_timer0_clockevent_init);

  1/*
  2 *  GT641xx clockevent routines.
  3 *
  4 *  Copyright (C) 2007	Yoichi Yuasa <yuasa@linux-mips.org>
  5 *
  6 *  This program is free software; you can redistribute it and/or modify
  7 *  it under the terms of the GNU General Public License as published by
  8 *  the Free Software Foundation; either version 2 of the License, or
  9 *  (at your option) any later version.
 10 *
 11 *  This program is distributed in the hope that it will be useful,
 12 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14 *  GNU General Public License for more details.
 15 *
 16 *  You should have received a copy of the GNU General Public License
 17 *  along with this program; if not, write to the Free Software
 18 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 19 */
 20#include <linux/clockchips.h>
 21#include <linux/init.h>
 22#include <linux/interrupt.h>
 23#include <linux/spinlock.h>
 24#include <linux/irq.h>
 25
 26#include <asm/gt64120.h>
 27#include <asm/time.h>
 28
 29static DEFINE_RAW_SPINLOCK(gt641xx_timer_lock);
 30static unsigned int gt641xx_base_clock;
 31
 32void gt641xx_set_base_clock(unsigned int clock)
 33{
 34	gt641xx_base_clock = clock;
 35}
 36
 37int gt641xx_timer0_state(void)
 38{
 39	if (GT_READ(GT_TC0_OFS))
 40		return 0;
 41
 42	GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
 43	GT_WRITE(GT_TC_CONTROL_OFS, GT_TC_CONTROL_ENTC0_MSK);
 44
 45	return 1;
 46}
 47
 48static int gt641xx_timer0_set_next_event(unsigned long delta,
 49					 struct clock_event_device *evt)
 50{
 51	u32 ctrl;
 52
 53	raw_spin_lock(&gt641xx_timer_lock);
 54
 55	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 56	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
 57	ctrl |= GT_TC_CONTROL_ENTC0_MSK;
 58
 59	GT_WRITE(GT_TC0_OFS, delta);
 60	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 61
 62	raw_spin_unlock(&gt641xx_timer_lock);
 63
 64	return 0;
 65}
 66
 67static int gt641xx_timer0_shutdown(struct clock_event_device *evt)
 68{
 69	u32 ctrl;
 70
 71	raw_spin_lock(&gt641xx_timer_lock);
 72
 73	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 74	ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK);
 75	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 76
 77	raw_spin_unlock(&gt641xx_timer_lock);
 78	return 0;
 79}
 80
 81static int gt641xx_timer0_set_oneshot(struct clock_event_device *evt)
 82{
 83	u32 ctrl;
 84
 85	raw_spin_lock(&gt641xx_timer_lock);
 86
 87	ctrl = GT_READ(GT_TC_CONTROL_OFS);
 88	ctrl &= ~GT_TC_CONTROL_SELTC0_MSK;
 89	ctrl |= GT_TC_CONTROL_ENTC0_MSK;
 90	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
 91
 92	raw_spin_unlock(&gt641xx_timer_lock);
 93	return 0;
 94}
 95
 96static int gt641xx_timer0_set_periodic(struct clock_event_device *evt)
 97{
 98	u32 ctrl;
 99
100	raw_spin_lock(&gt641xx_timer_lock);
101
102	ctrl = GT_READ(GT_TC_CONTROL_OFS);
103	ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK;
104	GT_WRITE(GT_TC_CONTROL_OFS, ctrl);
105
106	raw_spin_unlock(&gt641xx_timer_lock);
107	return 0;
108}
109
110static void gt641xx_timer0_event_handler(struct clock_event_device *dev)
111{
112}
113
114static struct clock_event_device gt641xx_timer0_clockevent = {
115	.name			= "gt641xx-timer0",
116	.features		= CLOCK_EVT_FEAT_PERIODIC |
117				  CLOCK_EVT_FEAT_ONESHOT,
118	.irq			= GT641XX_TIMER0_IRQ,
119	.set_next_event		= gt641xx_timer0_set_next_event,
120	.set_state_shutdown	= gt641xx_timer0_shutdown,
121	.set_state_periodic	= gt641xx_timer0_set_periodic,
122	.set_state_oneshot	= gt641xx_timer0_set_oneshot,
123	.tick_resume		= gt641xx_timer0_shutdown,
124	.event_handler		= gt641xx_timer0_event_handler,
125};
126
127static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id)
128{
129	struct clock_event_device *cd = &gt641xx_timer0_clockevent;
130
131	cd->event_handler(cd);
132
133	return IRQ_HANDLED;
134}
135
136static struct irqaction gt641xx_timer0_irqaction = {
137	.handler	= gt641xx_timer0_interrupt,
138	.flags		= IRQF_PERCPU | IRQF_TIMER,
139	.name		= "gt641xx_timer0",
140};
141
142static int __init gt641xx_timer0_clockevent_init(void)
143{
144	struct clock_event_device *cd;
145
146	if (!gt641xx_base_clock)
147		return 0;
148
149	GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ);
150
151	cd = &gt641xx_timer0_clockevent;
152	cd->rating = 200 + gt641xx_base_clock / 10000000;
153	clockevent_set_clock(cd, gt641xx_base_clock);
154	cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd);
155	cd->max_delta_ticks = 0x7fffffff;
156	cd->min_delta_ns = clockevent_delta2ns(0x300, cd);
157	cd->min_delta_ticks = 0x300;
158	cd->cpumask = cpumask_of(0);
159
160	clockevents_register_device(&gt641xx_timer0_clockevent);
161
162	return setup_irq(GT641XX_TIMER0_IRQ, &gt641xx_timer0_irqaction);
163}
164arch_initcall(gt641xx_timer0_clockevent_init);