patch-2.1.126 linux/arch/mips/sgi/kernel/reset.c

• Lines: 209
• Date: Tue Oct 20 13:52:55 1998
• Orig file: v2.1.125/linux/arch/mips/sgi/kernel/reset.c
• Orig date: Fri May 8 23:14:43 1998

diff -u --recursive --new-file v2.1.125/linux/arch/mips/sgi/kernel/reset.c linux/arch/mips/sgi/kernel/reset.c
@@ -1,31 +1,200 @@
-/*
- *  Reset a SGI.
+/* $Id: reset.c,v 1.6 1998/07/09 19:57:47 ralf Exp $
+ *
+ * Reset a SGI.
  *
  * 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 by Ralf Baechle
- *
- * $Id: reset.c,v 1.3 1998/05/01 01:35:18 ralf Exp $
  */
+#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/sgihpc.h>
+#include <asm/sgint23.h>
+
+/*
+ * Just powerdown if init hasn't done after POWERDOWN_TIMEOUT seconds.
+ * I'm not shure 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;
+static int shuting_down, has_paniced;
+
+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));
 
 /* XXX How to pass the reboot command to the firmware??? */
-void sgi_machine_restart(char *command)
+static void sgi_machine_restart(char *command)
 {
+	if (shuting_down)
+		sgi_machine_power_off();
 	prom_reboot();
 }
 
-void sgi_machine_halt(void)
+static void sgi_machine_halt(void)
 {
+	if (shuting_down)
+		sgi_machine_power_off();
 	prom_imode();
 }
 
-void sgi_machine_power_off(void)
+static void sgi_machine_power_off(void)
+{
+	struct indy_clock *clock = (struct indy_clock *)INDY_CLOCK_REGS;
+
+	cli();
+
+	clock->cmd |= 0x08;	/* Disable watchdog */
+	clock->whsec = 0;
+	clock->wsec = 0;
+
+	while(1) {
+		hpc3mregs->panel=0xfe;
+		/* Good bye cruel world ...  */
+
+		/* If we're still running, we probably got sent an alarm
+		   interrupt.  Read the flag to clear it.  */
+		clock->halarm;
+	}
+}
+
+static void power_timeout(unsigned long data)
+{
+	sgi_machine_power_off();
+}
+
+static void blink_timeout(unsigned long data)
 {
-	prom_powerdown();
+	/* XXX fix this for fullhouse  */
+	sgi_hpc_write1 ^= (HPC3_WRITE1_LC0OFF|HPC3_WRITE1_LC1OFF);
+	hpc3mregs->write1 = sgi_hpc_write1;
+
+	del_timer(&blink_timer);
+	blink_timer.expires = jiffies + data;
+	add_timer(&blink_timer);
+}
+
+static void debounce(unsigned long data)
+{
+	del_timer(&debounce_timer);
+	if (ioc_icontrol->istat1 & 2) { /* Interrupt still being sent.  */
+		debounce_timer.expires = jiffies + 5; /* 0.05s  */
+		add_timer(&debounce_timer);
+
+		hpc3mregs->panel = 0xf3;
+
+		return;
+	}
+
+	if (has_paniced)
+		prom_reboot();
+
+	enable_irq(9);
+}
+
+static inline void power_button(void)
+{
+	if (has_paniced)
+		return;
+
+	if (shuting_down || kill_proc(1, SIGINT, 1)) {
+		/* No init process or button pressed twice.  */
+		sgi_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 inline void volume_up_button(void)
+{
+	/* Later when we have sound support ... */
+}
+
+static inline void volume_down_button(void)
+{
+	/* Later when we have sound support ... */
+}
+
+static void panel_int(int irq, void *dev_id, struct pt_regs *regs)
+{
+	unsigned int buttons;
+
+	buttons = hpc3mregs->panel;
+	hpc3mregs->panel = 3; /* power_interrupt | power_supply_on */
+
+	if (ioc_icontrol->istat1 & 2) { /* Wait until interrupt goes away */
+		disable_irq(9);
+		init_timer(&debounce_timer);
+		debounce_timer.function = debounce;
+		debounce_timer.expires = jiffies + 5;
+		add_timer(&debounce_timer);
+	}
+
+	if (!(buttons & 2))		/* Power button was pressed */
+		power_button();
+	if (!(buttons & 0x40))		/* Volume up button was pressed */
+		volume_up_button();
+	if (!(buttons & 0x10))		/* Volume down button was pressed */
+		volume_down_button();
+}
+
+static int panic_event(struct notifier_block *this, unsigned long event,
+                      void *ptr)
+{
+	if (has_paniced)
+		return NOTIFY_DONE;
+	has_paniced = 1;
+
+	blink_timer.data = PANIC_FREQ;
+	blink_timeout(PANIC_FREQ);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block panic_block = {
+	panic_event,
+	NULL,
+	0
+};
+
+void indy_reboot_setup(void)
+{
+	static int setup_done;
+
+	if (setup_done)
+		return;
+	setup_done = 1;
+
+	_machine_restart = sgi_machine_restart;
+	_machine_halt = sgi_machine_halt;
+	_machine_power_off = sgi_machine_power_off;
+
+	request_irq(9, panel_int, 0, "Front Panel", NULL);
+	init_timer(&blink_timer);
+	blink_timer.function = blink_timeout;
+	notifier_chain_register(&panic_notifier_list, &panic_block);
 }