Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2001 Keith M Wesolowski |
| 7 | * Copyright (C) 2001 Paul Mundt |
| 8 | * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org> |
| 9 | */ |
| 10 | |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/sched.h> |
| 14 | #include <linux/notifier.h> |
| 15 | #include <linux/delay.h> |
| 16 | #include <linux/ds17287rtc.h> |
| 17 | #include <linux/interrupt.h> |
Ralf Baechle | fcdb27a | 2006-01-18 17:37:07 +0000 | [diff] [blame] | 18 | #include <linux/pm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | #include <asm/addrspace.h> |
| 21 | #include <asm/irq.h> |
| 22 | #include <asm/reboot.h> |
| 23 | #include <asm/system.h> |
| 24 | #include <asm/wbflush.h> |
| 25 | #include <asm/ip32/mace.h> |
| 26 | #include <asm/ip32/crime.h> |
| 27 | #include <asm/ip32/ip32_ints.h> |
| 28 | |
| 29 | #define POWERDOWN_TIMEOUT 120 |
| 30 | /* |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 31 | * Blink frequency during reboot grace period and when panicked. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | */ |
| 33 | #define POWERDOWN_FREQ (HZ / 4) |
| 34 | #define PANIC_FREQ (HZ / 8) |
| 35 | |
| 36 | static struct timer_list power_timer, blink_timer, debounce_timer; |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 37 | static int has_panicked, shuting_down; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | static void ip32_machine_restart(char *command) __attribute__((noreturn)); |
| 40 | static void ip32_machine_halt(void) __attribute__((noreturn)); |
| 41 | static void ip32_machine_power_off(void) __attribute__((noreturn)); |
| 42 | |
| 43 | static void ip32_machine_restart(char *cmd) |
| 44 | { |
| 45 | crime->control = CRIME_CONTROL_HARD_RESET; |
| 46 | while (1); |
| 47 | } |
| 48 | |
| 49 | static inline void ip32_machine_halt(void) |
| 50 | { |
| 51 | ip32_machine_power_off(); |
| 52 | } |
| 53 | |
| 54 | static void ip32_machine_power_off(void) |
| 55 | { |
| 56 | volatile unsigned char reg_a, xctrl_a, xctrl_b; |
| 57 | |
| 58 | disable_irq(MACEISA_RTC_IRQ); |
| 59 | reg_a = CMOS_READ(RTC_REG_A); |
| 60 | |
| 61 | /* setup for kickstart & wake-up (DS12287 Ref. Man. p. 19) */ |
| 62 | reg_a &= ~DS_REGA_DV2; |
| 63 | reg_a |= DS_REGA_DV1; |
| 64 | |
| 65 | CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); |
| 66 | wbflush(); |
| 67 | xctrl_b = CMOS_READ(DS_B1_XCTRL4B) |
| 68 | | DS_XCTRL4B_ABE | DS_XCTRL4B_KFE; |
| 69 | CMOS_WRITE(xctrl_b, DS_B1_XCTRL4B); |
| 70 | xctrl_a = CMOS_READ(DS_B1_XCTRL4A) & ~DS_XCTRL4A_IFS; |
| 71 | CMOS_WRITE(xctrl_a, DS_B1_XCTRL4A); |
| 72 | wbflush(); |
| 73 | /* adios amigos... */ |
| 74 | CMOS_WRITE(xctrl_a | DS_XCTRL4A_PAB, DS_B1_XCTRL4A); |
| 75 | CMOS_WRITE(reg_a, RTC_REG_A); |
| 76 | wbflush(); |
| 77 | while (1); |
| 78 | } |
| 79 | |
| 80 | static void power_timeout(unsigned long data) |
| 81 | { |
| 82 | ip32_machine_power_off(); |
| 83 | } |
| 84 | |
| 85 | static void blink_timeout(unsigned long data) |
| 86 | { |
| 87 | unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED; |
| 88 | mace->perif.ctrl.misc = led; |
| 89 | mod_timer(&blink_timer, jiffies + data); |
| 90 | } |
| 91 | |
| 92 | static void debounce(unsigned long data) |
| 93 | { |
| 94 | volatile unsigned char reg_a, reg_c, xctrl_a; |
| 95 | |
| 96 | reg_c = CMOS_READ(RTC_INTR_FLAGS); |
| 97 | CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); |
| 98 | wbflush(); |
| 99 | xctrl_a = CMOS_READ(DS_B1_XCTRL4A); |
| 100 | if ((xctrl_a & DS_XCTRL4A_IFS) || (reg_c & RTC_IRQF )) { |
| 101 | /* Interrupt still being sent. */ |
| 102 | debounce_timer.expires = jiffies + 50; |
| 103 | add_timer(&debounce_timer); |
| 104 | |
| 105 | /* clear interrupt source */ |
| 106 | CMOS_WRITE(xctrl_a & ~DS_XCTRL4A_IFS, DS_B1_XCTRL4A); |
| 107 | CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); |
| 108 | return; |
| 109 | } |
| 110 | CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); |
| 111 | |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 112 | if (has_panicked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | ip32_machine_restart(NULL); |
| 114 | |
| 115 | enable_irq(MACEISA_RTC_IRQ); |
| 116 | } |
| 117 | |
| 118 | static inline void ip32_power_button(void) |
| 119 | { |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 120 | if (has_panicked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | return; |
| 122 | |
| 123 | if (shuting_down || kill_proc(1, SIGINT, 1)) { |
| 124 | /* No init process or button pressed twice. */ |
| 125 | ip32_machine_power_off(); |
| 126 | } |
| 127 | |
| 128 | shuting_down = 1; |
| 129 | blink_timer.data = POWERDOWN_FREQ; |
| 130 | blink_timeout(POWERDOWN_FREQ); |
| 131 | |
| 132 | init_timer(&power_timer); |
| 133 | power_timer.function = power_timeout; |
| 134 | power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; |
| 135 | add_timer(&power_timer); |
| 136 | } |
| 137 | |
| 138 | static irqreturn_t ip32_rtc_int(int irq, void *dev_id, struct pt_regs *regs) |
| 139 | { |
| 140 | volatile unsigned char reg_c; |
| 141 | |
| 142 | reg_c = CMOS_READ(RTC_INTR_FLAGS); |
| 143 | if (!(reg_c & RTC_IRQF)) { |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 144 | printk(KERN_WARNING |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | "%s: RTC IRQ without RTC_IRQF\n", __FUNCTION__); |
| 146 | } |
| 147 | /* Wait until interrupt goes away */ |
| 148 | disable_irq(MACEISA_RTC_IRQ); |
| 149 | init_timer(&debounce_timer); |
| 150 | debounce_timer.function = debounce; |
| 151 | debounce_timer.expires = jiffies + 50; |
| 152 | add_timer(&debounce_timer); |
| 153 | |
| 154 | printk(KERN_DEBUG "Power button pressed\n"); |
| 155 | ip32_power_button(); |
| 156 | return IRQ_HANDLED; |
| 157 | } |
| 158 | |
| 159 | static int panic_event(struct notifier_block *this, unsigned long event, |
| 160 | void *ptr) |
| 161 | { |
| 162 | unsigned long led; |
| 163 | |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 164 | if (has_panicked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | return NOTIFY_DONE; |
Lee Revell | f18190b | 2006-06-26 18:30:00 +0200 | [diff] [blame] | 166 | has_panicked = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
| 168 | /* turn off the green LED */ |
| 169 | led = mace->perif.ctrl.misc | MACEISA_LED_GREEN; |
| 170 | mace->perif.ctrl.misc = led; |
| 171 | |
| 172 | blink_timer.data = PANIC_FREQ; |
| 173 | blink_timeout(PANIC_FREQ); |
| 174 | |
| 175 | return NOTIFY_DONE; |
| 176 | } |
| 177 | |
| 178 | static struct notifier_block panic_block = { |
| 179 | .notifier_call = panic_event, |
| 180 | }; |
| 181 | |
| 182 | static __init int ip32_reboot_setup(void) |
| 183 | { |
| 184 | /* turn on the green led only */ |
| 185 | unsigned long led = mace->perif.ctrl.misc; |
| 186 | led |= MACEISA_LED_RED; |
| 187 | led &= ~MACEISA_LED_GREEN; |
| 188 | mace->perif.ctrl.misc = led; |
| 189 | |
| 190 | _machine_restart = ip32_machine_restart; |
| 191 | _machine_halt = ip32_machine_halt; |
Ralf Baechle | fcdb27a | 2006-01-18 17:37:07 +0000 | [diff] [blame] | 192 | pm_power_off = ip32_machine_power_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | init_timer(&blink_timer); |
| 195 | blink_timer.function = blink_timeout; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 196 | atomic_notifier_chain_register(&panic_notifier_list, &panic_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL); |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | subsys_initcall(ip32_reboot_setup); |