Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 1 | /* |
| 2 | * GT641xx clockevent routines. |
| 3 | * |
Yoichi Yuasa | ada8e95 | 2009-07-03 00:39:38 +0900 | [diff] [blame] | 4 | * Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org> |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 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> |
David Howells | ca4d3e67 | 2010-10-07 14:08:54 +0100 | [diff] [blame] | 24 | #include <linux/irq.h> |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 25 | |
| 26 | #include <asm/gt64120.h> |
| 27 | #include <asm/time.h> |
| 28 | |
Ralf Baechle | 34ee414 | 2010-02-27 12:53:37 +0100 | [diff] [blame] | 29 | static DEFINE_RAW_SPINLOCK(gt641xx_timer_lock); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 30 | static unsigned int gt641xx_base_clock; |
| 31 | |
| 32 | void gt641xx_set_base_clock(unsigned int clock) |
| 33 | { |
| 34 | gt641xx_base_clock = clock; |
| 35 | } |
| 36 | |
| 37 | int 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 | |
| 48 | static int gt641xx_timer0_set_next_event(unsigned long delta, |
| 49 | struct clock_event_device *evt) |
| 50 | { |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 51 | u32 ctrl; |
| 52 | |
Ralf Baechle | 34ee414 | 2010-02-27 12:53:37 +0100 | [diff] [blame] | 53 | raw_spin_lock(>641xx_timer_lock); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 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 | |
Ralf Baechle | 34ee414 | 2010-02-27 12:53:37 +0100 | [diff] [blame] | 62 | raw_spin_unlock(>641xx_timer_lock); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 63 | |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static void gt641xx_timer0_set_mode(enum clock_event_mode mode, |
| 68 | struct clock_event_device *evt) |
| 69 | { |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 70 | u32 ctrl; |
| 71 | |
Ralf Baechle | 34ee414 | 2010-02-27 12:53:37 +0100 | [diff] [blame] | 72 | raw_spin_lock(>641xx_timer_lock); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 73 | |
| 74 | ctrl = GT_READ(GT_TC_CONTROL_OFS); |
| 75 | ctrl &= ~(GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK); |
| 76 | |
| 77 | switch (mode) { |
| 78 | case CLOCK_EVT_MODE_PERIODIC: |
| 79 | ctrl |= GT_TC_CONTROL_ENTC0_MSK | GT_TC_CONTROL_SELTC0_MSK; |
| 80 | break; |
| 81 | case CLOCK_EVT_MODE_ONESHOT: |
| 82 | ctrl |= GT_TC_CONTROL_ENTC0_MSK; |
| 83 | break; |
| 84 | default: |
| 85 | break; |
| 86 | } |
| 87 | |
| 88 | GT_WRITE(GT_TC_CONTROL_OFS, ctrl); |
| 89 | |
Ralf Baechle | 34ee414 | 2010-02-27 12:53:37 +0100 | [diff] [blame] | 90 | raw_spin_unlock(>641xx_timer_lock); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 91 | } |
| 92 | |
| 93 | static void gt641xx_timer0_event_handler(struct clock_event_device *dev) |
| 94 | { |
| 95 | } |
| 96 | |
| 97 | static struct clock_event_device gt641xx_timer0_clockevent = { |
| 98 | .name = "gt641xx-timer0", |
| 99 | .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 100 | .irq = GT641XX_TIMER0_IRQ, |
| 101 | .set_next_event = gt641xx_timer0_set_next_event, |
| 102 | .set_mode = gt641xx_timer0_set_mode, |
| 103 | .event_handler = gt641xx_timer0_event_handler, |
| 104 | }; |
| 105 | |
| 106 | static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id) |
| 107 | { |
| 108 | struct clock_event_device *cd = >641xx_timer0_clockevent; |
| 109 | |
| 110 | cd->event_handler(cd); |
| 111 | |
| 112 | return IRQ_HANDLED; |
| 113 | } |
| 114 | |
| 115 | static struct irqaction gt641xx_timer0_irqaction = { |
| 116 | .handler = gt641xx_timer0_interrupt, |
Yong Zhang | 8b5690f | 2011-11-22 14:38:03 +0000 | [diff] [blame] | 117 | .flags = IRQF_PERCPU | IRQF_TIMER, |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 118 | .name = "gt641xx_timer0", |
| 119 | }; |
| 120 | |
| 121 | static int __init gt641xx_timer0_clockevent_init(void) |
| 122 | { |
| 123 | struct clock_event_device *cd; |
| 124 | |
| 125 | if (!gt641xx_base_clock) |
| 126 | return 0; |
| 127 | |
| 128 | GT_WRITE(GT_TC0_OFS, gt641xx_base_clock / HZ); |
| 129 | |
| 130 | cd = >641xx_timer0_clockevent; |
| 131 | cd->rating = 200 + gt641xx_base_clock / 10000000; |
Yoichi Yuasa | 11c03a6 | 2007-10-23 18:22:50 +0900 | [diff] [blame] | 132 | clockevent_set_clock(cd, gt641xx_base_clock); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 133 | cd->max_delta_ns = clockevent_delta2ns(0x7fffffff, cd); |
| 134 | cd->min_delta_ns = clockevent_delta2ns(0x300, cd); |
Rusty Russell | 320ab2b | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 135 | cd->cpumask = cpumask_of(0); |
Yoichi Yuasa | 1097c6a | 2007-10-22 19:43:15 +0900 | [diff] [blame] | 136 | |
| 137 | clockevents_register_device(>641xx_timer0_clockevent); |
| 138 | |
| 139 | return setup_irq(GT641XX_TIMER0_IRQ, >641xx_timer0_irqaction); |
| 140 | } |
| 141 | arch_initcall(gt641xx_timer0_clockevent_init); |