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 #ifdef CONFIG_SUPERH32 8 #include <asm/watchdog.h> 9 #endif 10 #include <asm/addrspace.h> 11 #include <asm/reboot.h> 12 #include <asm/tlbflush.h> 13 #include <asm/traps.h> 14 15 void (*pm_power_off)(void); 16 EXPORT_SYMBOL(pm_power_off); 17 18 #ifdef CONFIG_SUPERH32 19 static void watchdog_trigger_immediate(void) 20 { 21 sh_wdt_write_cnt(0xFF); 22 sh_wdt_write_csr(0xC2); 23 } 24 #endif 25 26 static void native_machine_restart(char * __unused) 27 { 28 local_irq_disable(); 29 30 /* Destroy all of the TLBs in preparation for reset by MMU */ 31 __flush_tlb_global(); 32 33 /* Address error with SR.BL=1 first. */ 34 trigger_address_error(); 35 36 #ifdef CONFIG_SUPERH32 37 /* If that fails or is unsupported, go for the watchdog next. */ 38 watchdog_trigger_immediate(); 39 #endif 40 41 /* 42 * Give up and sleep. 43 */ 44 while (1) 45 cpu_sleep(); 46 } 47 48 static void native_machine_shutdown(void) 49 { 50 smp_send_stop(); 51 } 52 53 static void native_machine_power_off(void) 54 { 55 if (pm_power_off) 56 pm_power_off(); 57 } 58 59 static void native_machine_halt(void) 60 { 61 /* stop other cpus */ 62 machine_shutdown(); 63 64 /* stop this cpu */ 65 stop_this_cpu(NULL); 66 } 67 68 struct machine_ops machine_ops = { 69 .power_off = native_machine_power_off, 70 .shutdown = native_machine_shutdown, 71 .restart = native_machine_restart, 72 .halt = native_machine_halt, 73 #ifdef CONFIG_KEXEC 74 .crash_shutdown = native_machine_crash_shutdown, 75 #endif 76 }; 77 78 void machine_power_off(void) 79 { 80 machine_ops.power_off(); 81 } 82 83 void machine_shutdown(void) 84 { 85 machine_ops.shutdown(); 86 } 87 88 void machine_restart(char *cmd) 89 { 90 machine_ops.restart(cmd); 91 } 92 93 void machine_halt(void) 94 { 95 machine_ops.halt(); 96 } 97 98 #ifdef CONFIG_KEXEC 99 void machine_crash_shutdown(struct pt_regs *regs) 100 { 101 machine_ops.crash_shutdown(regs); 102 } 103 #endif 104