wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 1 | /* |
| 2 | * (C) Copyright 2000-2002 |
| 3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
| 4 | * |
| 5 | * (C) Copyright 2003 |
| 6 | * Gleb Natapov <gnatapov@mrv.com> |
| 7 | * |
| 8 | * See file CREDITS for list of people who contributed to this |
| 9 | * project. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or |
| 12 | * modify it under the terms of the GNU General Public License as |
| 13 | * published by the Free Software Foundation; either version 2 of |
| 14 | * the License, or (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 24 | * MA 02111-1307 USA |
| 25 | */ |
| 26 | |
| 27 | #include <common.h> |
| 28 | #include <asm/processor.h> |
| 29 | #include <watchdog.h> |
| 30 | #ifdef CONFIG_STATUS_LED |
| 31 | #include <status_led.h> |
| 32 | #endif |
| 33 | |
| 34 | #ifdef CONFIG_SHOW_ACTIVITY |
Wolfgang Denk | ec3d252 | 2008-09-09 10:08:02 +0200 | [diff] [blame] | 35 | void board_show_activity (ulong) __attribute__((weak, alias("__board_show_activity"))); |
| 36 | |
| 37 | void __board_show_activity (ulong dummy) |
| 38 | { |
| 39 | return; |
| 40 | } |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 41 | #endif /* CONFIG_SHOW_ACTIVITY */ |
| 42 | |
Jean-Christophe PLAGNIOL-VILLARD | 0383694 | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 43 | #ifndef CONFIG_SYS_WATCHDOG_FREQ |
| 44 | #define CONFIG_SYS_WATCHDOG_FREQ (CONFIG_SYS_HZ / 2) |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 45 | #endif |
| 46 | |
| 47 | extern int interrupt_init_cpu (unsigned *); |
| 48 | extern void timer_interrupt_cpu (struct pt_regs *); |
| 49 | |
| 50 | static unsigned decrementer_count; /* count value for 1e6/HZ microseconds */ |
| 51 | |
| 52 | static __inline__ unsigned long get_msr (void) |
| 53 | { |
wdenk | 1ebf41e | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 54 | unsigned long msr; |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 55 | |
wdenk | 1ebf41e | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 56 | asm volatile ("mfmsr %0":"=r" (msr):); |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 57 | |
wdenk | 1ebf41e | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 58 | return msr; |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | static __inline__ void set_msr (unsigned long msr) |
| 62 | { |
| 63 | asm volatile ("mtmsr %0"::"r" (msr)); |
| 64 | } |
| 65 | |
| 66 | static __inline__ unsigned long get_dec (void) |
| 67 | { |
| 68 | unsigned long val; |
| 69 | |
| 70 | asm volatile ("mfdec %0":"=r" (val):); |
| 71 | |
| 72 | return val; |
| 73 | } |
| 74 | |
| 75 | |
| 76 | static __inline__ void set_dec (unsigned long val) |
| 77 | { |
| 78 | if (val) |
| 79 | asm volatile ("mtdec %0"::"r" (val)); |
| 80 | } |
| 81 | |
| 82 | |
| 83 | void enable_interrupts (void) |
| 84 | { |
| 85 | set_msr (get_msr () | MSR_EE); |
| 86 | } |
| 87 | |
| 88 | /* returns flag if MSR_EE was set before */ |
| 89 | int disable_interrupts (void) |
| 90 | { |
| 91 | ulong msr = get_msr (); |
| 92 | |
| 93 | set_msr (msr & ~MSR_EE); |
| 94 | return ((msr & MSR_EE) != 0); |
| 95 | } |
| 96 | |
| 97 | int interrupt_init (void) |
| 98 | { |
| 99 | int ret; |
| 100 | |
wdenk | 1ebf41e | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 101 | /* call cpu specific function from $(CPU)/interrupts.c */ |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 102 | ret = interrupt_init_cpu (&decrementer_count); |
| 103 | |
| 104 | if (ret) |
| 105 | return ret; |
| 106 | |
| 107 | set_dec (decrementer_count); |
| 108 | |
| 109 | set_msr (get_msr () | MSR_EE); |
| 110 | |
| 111 | return (0); |
| 112 | } |
| 113 | |
| 114 | static volatile ulong timestamp = 0; |
| 115 | |
| 116 | void timer_interrupt (struct pt_regs *regs) |
| 117 | { |
| 118 | /* call cpu specific function from $(CPU)/interrupts.c */ |
| 119 | timer_interrupt_cpu (regs); |
| 120 | |
| 121 | /* Restore Decrementer Count */ |
| 122 | set_dec (decrementer_count); |
| 123 | |
| 124 | timestamp++; |
| 125 | |
| 126 | #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG) |
Jean-Christophe PLAGNIOL-VILLARD | 0383694 | 2008-10-16 15:01:15 +0200 | [diff] [blame] | 127 | if ((timestamp % (CONFIG_SYS_WATCHDOG_FREQ)) == 0) |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 128 | WATCHDOG_RESET (); |
| 129 | #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */ |
| 130 | |
| 131 | #ifdef CONFIG_STATUS_LED |
wdenk | 1ebf41e | 2004-01-02 14:00:00 +0000 | [diff] [blame] | 132 | status_led_tick (timestamp); |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 133 | #endif /* CONFIG_STATUS_LED */ |
| 134 | |
| 135 | #ifdef CONFIG_SHOW_ACTIVITY |
| 136 | board_show_activity (timestamp); |
| 137 | #endif /* CONFIG_SHOW_ACTIVITY */ |
| 138 | } |
| 139 | |
wdenk | c0aa5c5 | 2003-12-06 19:49:23 +0000 | [diff] [blame] | 140 | ulong get_timer (ulong base) |
| 141 | { |
| 142 | return (timestamp - base); |
| 143 | } |