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