| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * |
| 4 | * Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology |
| 5 | * Author: Fuxin Zhang, zhangfx@lemote.com |
| 6 | * Copyright (C) 2009 Lemote, Inc. |
| 7 | * Author: Zhangjin Wu, wuzhangjin@gmail.com |
| 8 | */ |
| 9 | #include <linux/cpu.h> |
| 10 | #include <linux/delay.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/kexec.h> |
| 13 | #include <linux/pm.h> |
| 14 | #include <linux/reboot.h> |
| 15 | #include <linux/slab.h> |
| 16 | |
| 17 | #include <asm/bootinfo.h> |
| 18 | #include <asm/idle.h> |
| 19 | #include <asm/reboot.h> |
| 20 | #include <asm/bug.h> |
| 21 | |
| 22 | #include <loongson.h> |
| 23 | #include <boot_param.h> |
| 24 | |
| 25 | static int firmware_restart(struct sys_off_data *unusedd) |
| 26 | { |
| 27 | |
| 28 | void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr; |
| 29 | |
| 30 | fw_restart(); |
| 31 | return NOTIFY_DONE; |
| 32 | } |
| 33 | |
| 34 | static int firmware_poweroff(struct sys_off_data *unused) |
| 35 | { |
| 36 | void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr; |
| 37 | |
| 38 | fw_poweroff(); |
| 39 | return NOTIFY_DONE; |
| 40 | } |
| 41 | |
| 42 | #ifdef CONFIG_KEXEC_CORE |
| 43 | |
| 44 | /* 0X80000000~0X80200000 is safe */ |
| 45 | #define MAX_ARGS 64 |
| 46 | #define KEXEC_CTRL_CODE 0xFFFFFFFF80100000UL |
| 47 | #define KEXEC_ARGV_ADDR 0xFFFFFFFF80108000UL |
| 48 | #define KEXEC_ARGV_SIZE COMMAND_LINE_SIZE |
| 49 | #define KEXEC_ENVP_SIZE 4800 |
| 50 | |
| 51 | static int kexec_argc; |
| 52 | static int kdump_argc; |
| 53 | static void *kexec_argv; |
| 54 | static void *kdump_argv; |
| 55 | static void *kexec_envp; |
| 56 | |
| 57 | static int loongson_kexec_prepare(struct kimage *image) |
| 58 | { |
| 59 | int i, argc = 0; |
| 60 | unsigned int *argv; |
| 61 | char *str, *ptr, *bootloader = "kexec" ; |
| 62 | |
| 63 | /* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */ |
| 64 | if (image->type == KEXEC_TYPE_DEFAULT) |
| 65 | argv = (unsigned int *)kexec_argv; |
| 66 | else |
| 67 | argv = (unsigned int *)kdump_argv; |
| 68 | |
| 69 | argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2); |
| 70 | |
| 71 | for (i = 0; i < image->nr_segments; i++) { |
| 72 | if (!strncmp(bootloader, (char *)image->segment[i].buf, |
| 73 | strlen(bootloader))) { |
| 74 | /* |
| 75 | * convert command line string to array |
| 76 | * of parameters (as bootloader does). |
| 77 | */ |
| 78 | int offt; |
| 79 | str = (char *)argv + KEXEC_ARGV_SIZE/2; |
| 80 | memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2); |
| 81 | ptr = strchr(str, ' '); |
| 82 | |
| 83 | while (ptr && (argc < MAX_ARGS)) { |
| 84 | *ptr = '\0'; |
| 85 | if (ptr[1] != ' ') { |
| 86 | offt = (int)(ptr - str + 1); |
| 87 | argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt; |
| 88 | argc++; |
| 89 | } |
| 90 | ptr = strchr(ptr + 1, ' '); |
| 91 | } |
| 92 | break; |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | if (image->type == KEXEC_TYPE_DEFAULT) |
| 97 | kexec_argc = argc; |
| 98 | else |
| 99 | kdump_argc = argc; |
| 100 | |
| 101 | /* kexec/kdump need a safe page to save reboot_code_buffer */ |
| 102 | image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE); |
| 103 | |
| 104 | return 0; |
| 105 | } |
| 106 | |
| 107 | static void loongson_kexec_shutdown(void) |
| 108 | { |
| 109 | #ifdef CONFIG_SMP |
| 110 | int cpu; |
| 111 | |
| 112 | /* All CPUs go to reboot_code_buffer */ |
| 113 | for_each_possible_cpu(cpu) |
| 114 | if (!cpu_online(cpu)) |
| 115 | cpu_device_up(dev: get_cpu_device(cpu)); |
| 116 | |
| 117 | secondary_kexec_args[0] = TO_UNCAC(0x3ff01000); |
| 118 | #endif |
| 119 | kexec_args[0] = kexec_argc; |
| 120 | kexec_args[1] = fw_arg1; |
| 121 | kexec_args[2] = fw_arg2; |
| 122 | memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE); |
| 123 | memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE); |
| 124 | } |
| 125 | |
| 126 | static void loongson_crash_shutdown(struct pt_regs *regs) |
| 127 | { |
| 128 | default_machine_crash_shutdown(regs); |
| 129 | kexec_args[0] = kdump_argc; |
| 130 | kexec_args[1] = fw_arg1; |
| 131 | kexec_args[2] = fw_arg2; |
| 132 | #ifdef CONFIG_SMP |
| 133 | secondary_kexec_args[0] = TO_UNCAC(0x3ff01000); |
| 134 | #endif |
| 135 | memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE); |
| 136 | memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE); |
| 137 | } |
| 138 | |
| 139 | #endif |
| 140 | |
| 141 | static int __init mips_reboot_setup(void) |
| 142 | { |
| 143 | if (loongson_sysconf.restart_addr) { |
| 144 | register_sys_off_handler(mode: SYS_OFF_MODE_RESTART, |
| 145 | SYS_OFF_PRIO_FIRMWARE, |
| 146 | callback: firmware_restart, NULL); |
| 147 | } |
| 148 | |
| 149 | if (loongson_sysconf.poweroff_addr) { |
| 150 | register_sys_off_handler(mode: SYS_OFF_MODE_POWER_OFF, |
| 151 | SYS_OFF_PRIO_FIRMWARE, |
| 152 | callback: firmware_poweroff, NULL); |
| 153 | } |
| 154 | |
| 155 | #ifdef CONFIG_KEXEC_CORE |
| 156 | kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL); |
| 157 | if (WARN_ON(!kexec_argv)) |
| 158 | return -ENOMEM; |
| 159 | |
| 160 | kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL); |
| 161 | if (WARN_ON(!kdump_argv)) |
| 162 | return -ENOMEM; |
| 163 | |
| 164 | kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL); |
| 165 | if (WARN_ON(!kexec_envp)) |
| 166 | return -ENOMEM; |
| 167 | |
| 168 | fw_arg1 = KEXEC_ARGV_ADDR; |
| 169 | memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE); |
| 170 | |
| 171 | _machine_kexec_prepare = loongson_kexec_prepare; |
| 172 | _machine_kexec_shutdown = loongson_kexec_shutdown; |
| 173 | _machine_crash_shutdown = loongson_crash_shutdown; |
| 174 | #endif |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | arch_initcall(mips_reboot_setup); |
| 180 | |