xref: /openbmc/linux/arch/sh/kernel/reboot.c (revision 9b0d0af1) 
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/pm.h>
3 #include <linux/kexec.h>
4 #include <linux/kernel.h>
5 #include <linux/reboot.h>
6 #include <linux/module.h>
7 #include <asm/watchdog.h>
8 #include <asm/addrspace.h>
9 #include <asm/reboot.h>
10 #include <asm/tlbflush.h>
11 #include <asm/traps.h>
12 
13 void (*pm_power_off)(void);
14 EXPORT_SYMBOL(pm_power_off);
15 
watchdog_trigger_immediate(void)16 static void watchdog_trigger_immediate(void)
17 {
18 	sh_wdt_write_cnt(0xFF);
19 	sh_wdt_write_csr(0xC2);
20 }
21 
native_machine_restart(char * __unused)22 static void native_machine_restart(char * __unused)
23 {
24 	local_irq_disable();
25 
26 	/* Destroy all of the TLBs in preparation for reset by MMU */
27 	__flush_tlb_global();
28 
29 	/* Address error with SR.BL=1 first. */
30 	trigger_address_error();
31 
32 	/* If that fails or is unsupported, go for the watchdog next. */
33 	watchdog_trigger_immediate();
34 
35 	/*
36 	 * Give up and sleep.
37 	 */
38 	while (1)
39 		cpu_sleep();
40 }
41 
native_machine_shutdown(void)42 static void native_machine_shutdown(void)
43 {
44 	smp_send_stop();
45 }
46 
native_machine_power_off(void)47 static void native_machine_power_off(void)
48 {
49 	do_kernel_power_off();
50 }
51 
native_machine_halt(void)52 static void native_machine_halt(void)
53 {
54 	/* stop other cpus */
55 	machine_shutdown();
56 
57 	/* stop this cpu */
58 	stop_this_cpu(NULL);
59 }
60 
61 struct machine_ops machine_ops = {
62 	.power_off	= native_machine_power_off,
63 	.shutdown	= native_machine_shutdown,
64 	.restart	= native_machine_restart,
65 	.halt		= native_machine_halt,
66 #ifdef CONFIG_KEXEC
67 	.crash_shutdown = native_machine_crash_shutdown,
68 #endif
69 };
70 
machine_power_off(void)71 void machine_power_off(void)
72 {
73 	machine_ops.power_off();
74 }
75 
machine_shutdown(void)76 void machine_shutdown(void)
77 {
78 	machine_ops.shutdown();
79 }
80 
machine_restart(char * cmd)81 void machine_restart(char *cmd)
82 {
83 	machine_ops.restart(cmd);
84 }
85 
machine_halt(void)86 void machine_halt(void)
87 {
88 	machine_ops.halt();
89 }
90 
91 #ifdef CONFIG_KEXEC
machine_crash_shutdown(struct pt_regs * regs)92 void machine_crash_shutdown(struct pt_regs *regs)
93 {
94 	machine_ops.crash_shutdown(regs);
95 }
96 #endif
97