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 000000000000..281f090e48a4
--- /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);