projects/linux·blob master · refs

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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
13void (*pm_power_off)(void);
14EXPORT_SYMBOL(pm_power_off);
15
16static void watchdog_trigger_immediate(void)
17{
18 sh_wdt_write_cnt(0xFF);
19 sh_wdt_write_csr(0xC2);
20}
21
22static 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
42static void native_machine_shutdown(void)
43{
44 smp_send_stop();
45}
46
47static void native_machine_power_off(void)
48{
49 do_kernel_power_off();
50}
51
52static 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
61struct 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_CORE
67 .crash_shutdown = native_machine_crash_shutdown,
68#endif
69};
70
71void machine_power_off(void)
72{
73 machine_ops.power_off();
74}
75
76void machine_shutdown(void)
77{
78 machine_ops.shutdown();
79}
80
81void machine_restart(char *cmd)
82{
83 machine_ops.restart(cmd);
84}
85
86void machine_halt(void)
87{
88 machine_ops.halt();
89}
90
91#ifdef CONFIG_KEXEC_CORE
92void machine_crash_shutdown(struct pt_regs *regs)
93{
94 machine_ops.crash_shutdown(regs);
95}
96#endif