1 files changed, 247 insertions, 0 deletions

diff --git a/arch/mips/sgi-ip22/ip22-reset.c b/arch/mips/sgi-ip22/ip22-reset.c
new file mode 100644
index 000000000000..ed5c60adce63
--- /dev/null
+++ b/arch/mips/sgi-ip22/ip22-reset.c
@@ -0,0 +1,247 @@
+/*
+ * 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) 1997, 1998, 2001, 2003 by Ralf Baechle
+ */
+#include <linux/init.h>
+#include <linux/ds1286.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/notifier.h>
+#include <linux/timer.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/reboot.h>
+#include <asm/sgialib.h>
+#include <asm/sgi/ioc.h>
+#include <asm/sgi/hpc3.h>
+#include <asm/sgi/mc.h>
+#include <asm/sgi/ip22.h>
+
+/*
+ * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
+ * I'm not sure if this feature is a good idea, for now it's here just to
+ * make the power button make behave just like under IRIX.
+ */
+#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, volume_timer;
+
+#define MACHINE_PANICED         1
+#define MACHINE_SHUTTING_DOWN   2
+static int machine_state = 0;
+
+static void sgi_machine_restart(char *command) __attribute__((noreturn));
+static void sgi_machine_halt(void) __attribute__((noreturn));
+static void sgi_machine_power_off(void) __attribute__((noreturn));
+
+static void sgi_machine_restart(char *command)
+{
+        if (machine_state & MACHINE_SHUTTING_DOWN)
+                sgi_machine_power_off();
+        sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
+        while (1);
+}
+
+static void sgi_machine_halt(void)
+{
+        if (machine_state & MACHINE_SHUTTING_DOWN)
+                sgi_machine_power_off();
+        ArcEnterInteractiveMode();
+}
+
+static void sgi_machine_power_off(void)
+{
+        unsigned int tmp;
+
+        local_irq_disable();
+
+        /* Disable watchdog */
+        tmp = hpc3c0->rtcregs[RTC_CMD] & 0xff;
+        hpc3c0->rtcregs[RTC_CMD] = tmp | RTC_WAM;
+        hpc3c0->rtcregs[RTC_WSEC] = 0;
+        hpc3c0->rtcregs[RTC_WHSEC] = 0;
+
+        while (1) {
+                sgioc->panel = ~SGIOC_PANEL_POWERON;
+                /* Good bye cruel world ...  */
+
+                /* If we're still running, we probably got sent an alarm
+                   interrupt.  Read the flag to clear it.  */
+                tmp = hpc3c0->rtcregs[RTC_HOURS_ALARM];
+        }
+}
+
+static void power_timeout(unsigned long data)
+{
+        sgi_machine_power_off();
+}
+
+static void blink_timeout(unsigned long data)
+{
+        /* XXX fix this for fullhouse  */
+        sgi_ioc_reset ^= (SGIOC_RESET_LC0OFF|SGIOC_RESET_LC1OFF);
+        sgioc->reset = sgi_ioc_reset;
+
+        mod_timer(&blink_timer, jiffies+data);
+}
+
+static void debounce(unsigned long data)
+{
+        del_timer(&debounce_timer);
+        if (sgint->istat1 & SGINT_ISTAT1_PWR) {
+                /* Interrupt still being sent. */
+                debounce_timer.expires = jiffies + 5; /* 0.05s  */
+                add_timer(&debounce_timer);
+
+                sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR |
+                               SGIOC_PANEL_VOLDNINTR | SGIOC_PANEL_VOLDNHOLD |
+                               SGIOC_PANEL_VOLUPINTR | SGIOC_PANEL_VOLUPHOLD;
+
+                return;
+        }
+
+        if (machine_state & MACHINE_PANICED)
+                sgimc->cpuctrl0 |= SGIMC_CCTRL0_SYSINIT;
+
+        enable_irq(SGI_PANEL_IRQ);
+}
+
+static inline void power_button(void)
+{
+        if (machine_state & MACHINE_PANICED)
+                return;
+
+        if ((machine_state & MACHINE_SHUTTING_DOWN) || kill_proc(1,SIGINT,1)) {
+                /* No init process or button pressed twice.  */
+                sgi_machine_power_off();
+        }
+
+        machine_state |= MACHINE_SHUTTING_DOWN;
+        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);
+}
+
+void (*indy_volume_button)(int) = NULL;
+
+EXPORT_SYMBOL(indy_volume_button);
+
+static inline void volume_up_button(unsigned long data)
+{
+        del_timer(&volume_timer);
+
+        if (indy_volume_button)
+                indy_volume_button(1);
+
+        if (sgint->istat1 & SGINT_ISTAT1_PWR) {
+                volume_timer.expires = jiffies + 1;
+                add_timer(&volume_timer);
+        }
+}
+
+static inline void volume_down_button(unsigned long data)
+{
+        del_timer(&volume_timer);
+
+        if (indy_volume_button)
+                indy_volume_button(-1);
+
+        if (sgint->istat1 & SGINT_ISTAT1_PWR) {
+                volume_timer.expires = jiffies + 1;
+                add_timer(&volume_timer);
+        }
+}
+
+static irqreturn_t panel_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+        unsigned int buttons;
+
+        buttons = sgioc->panel;
+        sgioc->panel = SGIOC_PANEL_POWERON | SGIOC_PANEL_POWERINTR;
+
+        if (sgint->istat1 & SGINT_ISTAT1_PWR) {
+                /* Wait until interrupt goes away */
+                disable_irq(SGI_PANEL_IRQ);
+                init_timer(&debounce_timer);
+                debounce_timer.function = debounce;
+                debounce_timer.expires = jiffies + 5;
+                add_timer(&debounce_timer);
+        }
+
+        /* Power button was pressed 
+         * ioc.ps page 22: "The Panel Register is called Power Control by Full
+         * House. Only lowest 2 bits are used. Guiness uses upper four bits
+         * for volume control". This is not true, all bits are pulled high
+         * on fullhouse */
+        if (ip22_is_fullhouse() || !(buttons & SGIOC_PANEL_POWERINTR)) {
+                power_button();
+                return IRQ_HANDLED;
+        }
+        /* TODO: mute/unmute */
+        /* Volume up button was pressed */
+        if (!(buttons & SGIOC_PANEL_VOLUPINTR)) {
+                init_timer(&volume_timer);
+                volume_timer.function = volume_up_button;
+                volume_timer.expires = jiffies + 1;
+                add_timer(&volume_timer);
+        }
+        /* Volume down button was pressed */
+        if (!(buttons & SGIOC_PANEL_VOLDNINTR)) {
+                init_timer(&volume_timer);
+                volume_timer.function = volume_down_button;
+                volume_timer.expires = jiffies + 1;
+                add_timer(&volume_timer);
+        }
+
+        return IRQ_HANDLED;
+}
+
+static int panic_event(struct notifier_block *this, unsigned long event,
+                      void *ptr)
+{
+        if (machine_state & MACHINE_PANICED)
+                return NOTIFY_DONE;
+        machine_state |= MACHINE_PANICED;
+
+        blink_timer.data = PANIC_FREQ;
+        blink_timeout(PANIC_FREQ);
+
+        return NOTIFY_DONE;
+}
+
+static struct notifier_block panic_block = {
+        .notifier_call  = panic_event,
+};
+
+static int __init reboot_setup(void)
+{
+        _machine_restart = sgi_machine_restart;
+        _machine_halt = sgi_machine_halt;
+        _machine_power_off = sgi_machine_power_off;
+
+        request_irq(SGI_PANEL_IRQ, panel_int, 0, "Front Panel", NULL);
+        init_timer(&blink_timer);
+        blink_timer.function = blink_timeout;
+        notifier_chain_register(&panic_notifier_list, &panic_block);
+
+        return 0;
+}
+
+subsys_initcall(reboot_setup);