diff options
Diffstat (limited to 'arch/mips/sgi-ip32/ip32-reset.c')
| -rw-r--r-- | arch/mips/sgi-ip32/ip32-reset.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip32/ip32-reset.c b/arch/mips/sgi-ip32/ip32-reset.c new file mode 100644 index 00000000000..281f090e48a --- /dev/null +++ b/arch/mips/sgi-ip32/ip32-reset.c @@ -0,0 +1,202 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 2001 Keith M Wesolowski + * Copyright (C) 2001 Paul Mundt + * Copyright (C) 2003 Guido Guenther <agx@sigxcpu.org> + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/notifier.h> +#include <linux/delay.h> +#include <linux/ds17287rtc.h> +#include <linux/interrupt.h> + +#include <asm/addrspace.h> +#include <asm/irq.h> +#include <asm/reboot.h> +#include <asm/system.h> +#include <asm/wbflush.h> +#include <asm/ip32/mace.h> +#include <asm/ip32/crime.h> +#include <asm/ip32/ip32_ints.h> + +#define POWERDOWN_TIMEOUT 120 +/* + * Blink frequency during reboot grace period and when paniced. + */ +#define POWERDOWN_FREQ (HZ / 4) +#define PANIC_FREQ (HZ / 8) + +static struct timer_list power_timer, blink_timer, debounce_timer; +static int has_paniced, shuting_down; + +static void ip32_machine_restart(char *command) __attribute__((noreturn)); +static void ip32_machine_halt(void) __attribute__((noreturn)); +static void ip32_machine_power_off(void) __attribute__((noreturn)); + +static void ip32_machine_restart(char *cmd) +{ + crime->control = CRIME_CONTROL_HARD_RESET; + while (1); +} + +static inline void ip32_machine_halt(void) +{ + ip32_machine_power_off(); +} + +static void ip32_machine_power_off(void) +{ + volatile unsigned char reg_a, xctrl_a, xctrl_b; + + disable_irq(MACEISA_RTC_IRQ); + reg_a = CMOS_READ(RTC_REG_A); + + /* setup for kickstart & wake-up (DS12287 Ref. Man. p. 19) */ + reg_a &= ~DS_REGA_DV2; + reg_a |= DS_REGA_DV1; + + CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); + wbflush(); + xctrl_b = CMOS_READ(DS_B1_XCTRL4B) + | DS_XCTRL4B_ABE | DS_XCTRL4B_KFE; + CMOS_WRITE(xctrl_b, DS_B1_XCTRL4B); + xctrl_a = CMOS_READ(DS_B1_XCTRL4A) & ~DS_XCTRL4A_IFS; + CMOS_WRITE(xctrl_a, DS_B1_XCTRL4A); + wbflush(); + /* adios amigos... */ + CMOS_WRITE(xctrl_a | DS_XCTRL4A_PAB, DS_B1_XCTRL4A); + CMOS_WRITE(reg_a, RTC_REG_A); + wbflush(); + while (1); +} + +static void power_timeout(unsigned long data) +{ + ip32_machine_power_off(); +} + +static void blink_timeout(unsigned long data) +{ + unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED; + mace->perif.ctrl.misc = led; + mod_timer(&blink_timer, jiffies + data); +} + +static void debounce(unsigned long data) +{ + volatile unsigned char reg_a, reg_c, xctrl_a; + + reg_c = CMOS_READ(RTC_INTR_FLAGS); + CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A); + wbflush(); + xctrl_a = CMOS_READ(DS_B1_XCTRL4A); + if ((xctrl_a & DS_XCTRL4A_IFS) || (reg_c & RTC_IRQF )) { + /* Interrupt still being sent. */ + debounce_timer.expires = jiffies + 50; + add_timer(&debounce_timer); + + /* clear interrupt source */ + CMOS_WRITE(xctrl_a & ~DS_XCTRL4A_IFS, DS_B1_XCTRL4A); + CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); + return; + } + CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A); + + if (has_paniced) + ip32_machine_restart(NULL); + + enable_irq(MACEISA_RTC_IRQ); +} + +static inline void ip32_power_button(void) +{ + if (has_paniced) + return; + + if (shuting_down || kill_proc(1, SIGINT, 1)) { + /* No init process or button pressed twice. */ + ip32_machine_power_off(); + } + + shuting_down = 1; + blink_timer.data = POWERDOWN_FREQ; + blink_timeout(POWERDOWN_FREQ); + + init_timer(&power_timer); + power_timer.function = power_timeout; + power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ; + add_timer(&power_timer); +} + +static irqreturn_t ip32_rtc_int(int irq, void *dev_id, struct pt_regs *regs) +{ + volatile unsigned char reg_c; + + reg_c = CMOS_READ(RTC_INTR_FLAGS); + if (!(reg_c & RTC_IRQF)) { + printk(KERN_WARNING + "%s: RTC IRQ without RTC_IRQF\n", __FUNCTION__); + } + /* Wait until interrupt goes away */ + disable_irq(MACEISA_RTC_IRQ); + init_timer(&debounce_timer); + debounce_timer.function = debounce; + debounce_timer.expires = jiffies + 50; + add_timer(&debounce_timer); + + printk(KERN_DEBUG "Power button pressed\n"); + ip32_power_button(); + return IRQ_HANDLED; +} + +static int panic_event(struct notifier_block *this, unsigned long event, + void *ptr) +{ + unsigned long led; + + if (has_paniced) + return NOTIFY_DONE; + has_paniced = 1; + + /* turn off the green LED */ + led = mace->perif.ctrl.misc | MACEISA_LED_GREEN; + mace->perif.ctrl.misc = led; + + blink_timer.data = PANIC_FREQ; + blink_timeout(PANIC_FREQ); + + return NOTIFY_DONE; +} + +static struct notifier_block panic_block = { + .notifier_call = panic_event, +}; + +static __init int ip32_reboot_setup(void) +{ + /* turn on the green led only */ + unsigned long led = mace->perif.ctrl.misc; + led |= MACEISA_LED_RED; + led &= ~MACEISA_LED_GREEN; + mace->perif.ctrl.misc = led; + + _machine_restart = ip32_machine_restart; + _machine_halt = ip32_machine_halt; + _machine_power_off = ip32_machine_power_off; + + init_timer(&blink_timer); + blink_timer.function = blink_timeout; + notifier_chain_register(&panic_notifier_list, &panic_block); + + request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL); + + return 0; +} + +subsys_initcall(ip32_reboot_setup); |