x86: fix bogus KERN_ALERT on oops
[wrt350n-kernel.git] / arch / mips / sgi-ip32 / ip32-reset.c
blob624bbdbff2a8bf40d47ae412d5361b43369b9b36
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.
6 * Copyright (C) 2001 Keith M Wesolowski
7 * Copyright (C) 2001 Paul Mundt
8 * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org>
9 */
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>
18 #include <linux/pm.h>
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>
29 #define POWERDOWN_TIMEOUT 120
31 * Blink frequency during reboot grace period and when panicked.
33 #define POWERDOWN_FREQ (HZ / 4)
34 #define PANIC_FREQ (HZ / 8)
36 static struct timer_list power_timer, blink_timer, debounce_timer;
37 static int has_panicked, shuting_down;
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));
43 static void ip32_machine_restart(char *cmd)
45 crime->control = CRIME_CONTROL_HARD_RESET;
46 while (1);
49 static inline void ip32_machine_halt(void)
51 ip32_machine_power_off();
54 static void ip32_machine_power_off(void)
56 volatile unsigned char reg_a, xctrl_a, xctrl_b;
58 disable_irq(MACEISA_RTC_IRQ);
59 reg_a = CMOS_READ(RTC_REG_A);
61 /* setup for kickstart & wake-up (DS12287 Ref. Man. p. 19) */
62 reg_a &= ~DS_REGA_DV2;
63 reg_a |= DS_REGA_DV1;
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);
80 static void power_timeout(unsigned long data)
82 ip32_machine_power_off();
85 static void blink_timeout(unsigned long data)
87 unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
88 mace->perif.ctrl.misc = led;
89 mod_timer(&blink_timer, jiffies + data);
92 static void debounce(unsigned long data)
94 volatile unsigned char reg_a, reg_c, xctrl_a;
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);
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;
110 CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A);
112 if (has_panicked)
113 ip32_machine_restart(NULL);
115 enable_irq(MACEISA_RTC_IRQ);
118 static inline void ip32_power_button(void)
120 if (has_panicked)
121 return;
123 if (shuting_down || kill_cad_pid(SIGINT, 1)) {
124 /* No init process or button pressed twice. */
125 ip32_machine_power_off();
128 shuting_down = 1;
129 blink_timer.data = POWERDOWN_FREQ;
130 blink_timeout(POWERDOWN_FREQ);
132 init_timer(&power_timer);
133 power_timer.function = power_timeout;
134 power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
135 add_timer(&power_timer);
138 static irqreturn_t ip32_rtc_int(int irq, void *dev_id)
140 volatile unsigned char reg_c;
142 reg_c = CMOS_READ(RTC_INTR_FLAGS);
143 if (!(reg_c & RTC_IRQF)) {
144 printk(KERN_WARNING
145 "%s: RTC IRQ without RTC_IRQF\n", __FUNCTION__);
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);
154 printk(KERN_DEBUG "Power button pressed\n");
155 ip32_power_button();
156 return IRQ_HANDLED;
159 static int panic_event(struct notifier_block *this, unsigned long event,
160 void *ptr)
162 unsigned long led;
164 if (has_panicked)
165 return NOTIFY_DONE;
166 has_panicked = 1;
168 /* turn off the green LED */
169 led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
170 mace->perif.ctrl.misc = led;
172 blink_timer.data = PANIC_FREQ;
173 blink_timeout(PANIC_FREQ);
175 return NOTIFY_DONE;
178 static struct notifier_block panic_block = {
179 .notifier_call = panic_event,
182 static __init int ip32_reboot_setup(void)
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;
190 _machine_restart = ip32_machine_restart;
191 _machine_halt = ip32_machine_halt;
192 pm_power_off = ip32_machine_power_off;
194 init_timer(&blink_timer);
195 blink_timer.function = blink_timeout;
196 atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
198 if (request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL))
199 panic("Can't allocate MACEISA RTC IRQ");
201 return 0;
204 subsys_initcall(ip32_reboot_setup);