Brian Swetland | 2500aa1 | 2009-01-01 04:33:55 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2008, Google Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * * Neither the name of Google, Inc. nor the names of its contributors |
| 15 | * may be used to endorse or promote products derived from this |
| 16 | * software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 22 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 24 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 25 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 26 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 27 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 28 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <debug.h> |
| 33 | #include <reg.h> |
| 34 | #include <sys/types.h> |
| 35 | |
| 36 | #include <platform/timer.h> |
| 37 | #include <platform/irqs.h> |
| 38 | #include <platform/iomap.h> |
| 39 | #include <platform/interrupts.h> |
| 40 | #include <kernel/thread.h> |
| 41 | |
| 42 | #define GPT_REG(off) (MSM_GPT_BASE + (off)) |
| 43 | |
| 44 | #define GPT_MATCH_VAL GPT_REG(0x0000) |
| 45 | #define GPT_COUNT_VAL GPT_REG(0x0004) |
| 46 | #define GPT_ENABLE GPT_REG(0x0008) |
| 47 | #define GPT_ENABLE_CLR_ON_MATCH_EN 2 |
| 48 | #define GPT_ENABLE_EN 1 |
| 49 | #define GPT_CLEAR GPT_REG(0x000C) |
| 50 | |
| 51 | #define DGT_MATCH_VAL GPT_REG(0x0010) |
| 52 | #define DGT_COUNT_VAL GPT_REG(0x0014) |
| 53 | #define DGT_ENABLE GPT_REG(0x0018) |
| 54 | #define DGT_ENABLE_CLR_ON_MATCH_EN 2 |
| 55 | #define DGT_ENABLE_EN 1 |
| 56 | #define DGT_CLEAR GPT_REG(0x001C) |
| 57 | |
| 58 | |
| 59 | static platform_timer_callback timer_callback; |
| 60 | static void *timer_arg; |
| 61 | static time_t timer_interval; |
| 62 | |
| 63 | static volatile uint32_t ticks; |
| 64 | |
| 65 | static enum handler_return timer_irq(void *arg) |
| 66 | { |
| 67 | ticks += timer_interval; |
| 68 | return timer_callback(timer_arg, ticks); |
| 69 | } |
| 70 | |
| 71 | status_t platform_set_periodic_timer( |
| 72 | platform_timer_callback callback, |
| 73 | void *arg, time_t interval) |
| 74 | { |
| 75 | enter_critical_section(); |
| 76 | |
| 77 | timer_callback = callback; |
| 78 | timer_arg = arg; |
| 79 | timer_interval = interval; |
| 80 | |
| 81 | writel(timer_interval * 19200, DGT_MATCH_VAL); |
| 82 | writel(0, DGT_CLEAR); |
| 83 | writel(DGT_ENABLE_EN | DGT_ENABLE_CLR_ON_MATCH_EN, DGT_ENABLE); |
| 84 | |
| 85 | register_int_handler(INT_DEBUG_TIMER_EXP, timer_irq, 0); |
| 86 | unmask_interrupt(INT_DEBUG_TIMER_EXP); |
| 87 | |
| 88 | exit_critical_section(); |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | |
| 93 | time_t current_time(void) |
| 94 | { |
| 95 | return ticks; |
| 96 | } |
| 97 | |
| 98 | void platform_init_timer(void) |
| 99 | { |
| 100 | writel(0, DGT_ENABLE); |
| 101 | } |
| 102 | |