Revert "MIPS: Loongson64: reset: Prioritise firmware service"

BugLink: https://bugs.launchpad.net/bugs/2080594

This reverts commit 77011a1d7a1a973d1657d06b658ce20f94172827 which is
commit 4e7ca0b upstream.

Turns out to break the 5.15.y build, it should not have been backported
that far.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Link: https://lore.kernel.org/r/135ef4fd-4fc9-40b4-b188-8e64946f47c4@roeck-us.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: gregkh

arch/mips/loongson64/reset.c

@@ -11,7 +11,6 @@
 #include <linux/init.h>
 #include <linux/kexec.h>
 #include <linux/pm.h>
-#include <linux/reboot.h>
 #include <linux/slab.h>
 
 #include <asm/bootinfo.h>
@@ -22,21 +21,36 @@
 #include <loongson.h>
 #include <boot_param.h>
 
-static int firmware_restart(struct sys_off_data *unusedd)
+static void loongson_restart(char *command)
 {
 
 	void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
 
 	fw_restart();
-	return NOTIFY_DONE;
+	while (1) {
+		if (cpu_wait)
+			cpu_wait();
+	}
 }
 
-static int firmware_poweroff(struct sys_off_data *unused)
+static void loongson_poweroff(void)
 {
 	void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
 
 	fw_poweroff();
-	return NOTIFY_DONE;
+	while (1) {
+		if (cpu_wait)
+			cpu_wait();
+	}
+}
+
+static void loongson_halt(void)
+{
+	pr_notice("\n\n** You can safely turn off the power now **\n\n");
+	while (1) {
+		if (cpu_wait)
+			cpu_wait();
+	}
 }
 
 #ifdef CONFIG_KEXEC
@@ -140,17 +154,9 @@ static void loongson_crash_shutdown(struct pt_regs *regs)
 
 static int __init mips_reboot_setup(void)
 {
-	if (loongson_sysconf.restart_addr) {
-		register_sys_off_handler(SYS_OFF_MODE_RESTART,
-				 SYS_OFF_PRIO_FIRMWARE,
-				 firmware_restart, NULL);
-	}
-
-	if (loongson_sysconf.poweroff_addr) {
-		register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
-				 SYS_OFF_PRIO_FIRMWARE,
-				 firmware_poweroff, NULL);
-	}
+	_machine_restart = loongson_restart;
+	_machine_halt = loongson_halt;
+	pm_power_off = loongson_poweroff;
 
 #ifdef CONFIG_KEXEC
 	kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);