From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Thu, 11 Apr 2024 10:27:49 +0200
Subject: Adding upstream version 6.6.15.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 arch/mips/sgi-ip32/ip32-reset.c | 153 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 arch/mips/sgi-ip32/ip32-reset.c

(limited to 'arch/mips/sgi-ip32/ip32-reset.c')

diff --git a/arch/mips/sgi-ip32/ip32-reset.c b/arch/mips/sgi-ip32/ip32-reset.c
new file mode 100644
index 0000000000..18d1c115cd
--- /dev/null
+++ b/arch/mips/sgi-ip32/ip32-reset.c
@@ -0,0 +1,153 @@
+/*
+ * 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/compiler.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/panic_notifier.h>
+#include <linux/sched.h>
+#include <linux/sched/signal.h>
+#include <linux/notifier.h>
+#include <linux/delay.h>
+#include <linux/rtc/ds1685.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+
+#include <asm/addrspace.h>
+#include <asm/irq.h>
+#include <asm/reboot.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 panicked.
+ */
+#define POWERDOWN_FREQ		(HZ / 4)
+#define PANIC_FREQ		(HZ / 8)
+
+extern struct platform_device ip32_rtc_device;
+
+static struct timer_list power_timer, blink_timer;
+static unsigned long blink_timer_timeout;
+static int has_panicked, shutting_down;
+
+static __noreturn void ip32_poweroff(void *data)
+{
+	void (*poweroff_func)(struct platform_device *) =
+		symbol_get(ds1685_rtc_poweroff);
+
+#ifdef CONFIG_MODULES
+	/* If the first __symbol_get failed, our module wasn't loaded. */
+	if (!poweroff_func) {
+		request_module("rtc-ds1685");
+		poweroff_func = symbol_get(ds1685_rtc_poweroff);
+	}
+#endif
+
+	if (!poweroff_func)
+		pr_emerg("RTC not available for power-off.  Spinning forever ...\n");
+	else {
+		(*poweroff_func)((struct platform_device *)data);
+		symbol_put(ds1685_rtc_poweroff);
+	}
+
+	unreachable();
+}
+
+static void ip32_machine_restart(char *cmd) __noreturn;
+static void ip32_machine_restart(char *cmd)
+{
+	msleep(20);
+	crime->control = CRIME_CONTROL_HARD_RESET;
+	unreachable();
+}
+
+static void blink_timeout(struct timer_list *unused)
+{
+	unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
+	mace->perif.ctrl.misc = led;
+	mod_timer(&blink_timer, jiffies + blink_timer_timeout);
+}
+
+static void ip32_machine_halt(void)
+{
+	ip32_poweroff(&ip32_rtc_device);
+}
+
+static void power_timeout(struct timer_list *unused)
+{
+	ip32_poweroff(&ip32_rtc_device);
+}
+
+void ip32_prepare_poweroff(void)
+{
+	if (has_panicked)
+		return;
+
+	if (shutting_down || kill_cad_pid(SIGINT, 1)) {
+		/* No init process or button pressed twice.  */
+		ip32_poweroff(&ip32_rtc_device);
+	}
+
+	shutting_down = 1;
+	blink_timer_timeout = POWERDOWN_FREQ;
+	blink_timeout(&blink_timer);
+
+	timer_setup(&power_timer, power_timeout, 0);
+	power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
+	add_timer(&power_timer);
+}
+
+static int panic_event(struct notifier_block *this, unsigned long event,
+		       void *ptr)
+{
+	unsigned long led;
+
+	if (has_panicked)
+		return NOTIFY_DONE;
+	has_panicked = 1;
+
+	/* turn off the green LED */
+	led = mace->perif.ctrl.misc | MACEISA_LED_GREEN;
+	mace->perif.ctrl.misc = led;
+
+	blink_timer_timeout = PANIC_FREQ;
+	blink_timeout(&blink_timer);
+
+	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;
+	pm_power_off = ip32_machine_halt;
+
+	timer_setup(&blink_timer, blink_timeout, 0);
+	atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
+
+	return 0;
+}
+
+subsys_initcall(ip32_reboot_setup);
-- 
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