| 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 |