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
16 static void watchdog_trigger_immediate(void)
17 {
18 sh_wdt_write_cnt(0xFF);
19 sh_wdt_write_csr(0xC2);
20 }
21
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
42 static void native_machine_shutdown(void)
43 {
44 smp_send_stop();
45 }
46
47 static void native_machine_power_off(void)
48 {
49 do_kernel_power_off();
50 }
51
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_CORE
67 .crash_shutdown = native_machine_crash_shutdown,
68 #endif
69 };
70
71 void machine_power_off(void)
72 {
73 machine_ops.power_off();
74 }
75
76 void machine_shutdown(void)
77 {
78 machine_ops.shutdown();
79 }
80
81 void machine_restart(char *cmd)
82 {
83 machine_ops.restart(cmd);
84 }
85
86 void machine_halt(void)
87 {
88 machine_ops.halt();
89 }
90
91 #ifdef CONFIG_KEXEC_CORE
92 void machine_crash_shutdown(struct pt_regs *regs)
93 {
94 machine_ops.crash_shutdown(regs);
95 }
96 #endif
97
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