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-rw-r--r--arch/mips/sgi-ip32/ip32-reset.c202
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);