arch/mips/loongson64/reset.c

   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/slab.h>
  15
  16 #include <asm/bootinfo.h>
  17 #include <asm/idle.h>
  18 #include <asm/reboot.h>
  19
  20 #include <loongson.h>
  21 #include <boot_param.h>
  22
  23 static void loongson_restart(char *command)
  24 {
  25
  26         void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
  27
  28         fw_restart();
  29         while (1) {
  30                 if (cpu_wait)
  31                         cpu_wait();
  32         }
  33 }
  34
  35 static void loongson_poweroff(void)
  36 {
  37         void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
  38
  39         fw_poweroff();
  40         while (1) {
  41                 if (cpu_wait)
  42                         cpu_wait();
  43         }
  44 }
  45
  46 static void loongson_halt(void)
  47 {
  48         pr_notice("\n\n** You can safely turn off the power now **\n\n");
  49         while (1) {
  50                 if (cpu_wait)
  51                         cpu_wait();
  52         }
  53 }
  54
  55 #ifdef CONFIG_KEXEC
  56
  57 /* 0X80000000~0X80200000 is safe */
  58 #define MAX_ARGS        64
  59 #define KEXEC_CTRL_CODE 0xFFFFFFFF80100000UL
  60 #define KEXEC_ARGV_ADDR 0xFFFFFFFF80108000UL
  61 #define KEXEC_ARGV_SIZE COMMAND_LINE_SIZE
  62 #define KEXEC_ENVP_SIZE 4800
  63
  64 static int kexec_argc;
  65 static int kdump_argc;
  66 static void *kexec_argv;
  67 static void *kdump_argv;
  68 static void *kexec_envp;
  69
  70 static int loongson_kexec_prepare(struct kimage *image)
  71 {
  72         int i, argc = 0;
  73         unsigned int *argv;
  74         char *str, *ptr, *bootloader = "kexec";
  75
  76         /* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */
  77         if (image->type == KEXEC_TYPE_DEFAULT)
  78                 argv = (unsigned int *)kexec_argv;
  79         else
  80                 argv = (unsigned int *)kdump_argv;
  81
  82         argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2);
  83
  84         for (i = 0; i < image->nr_segments; i++) {
  85                 if (!strncmp(bootloader, (char *)image->segment[i].buf,
  86                                 strlen(bootloader))) {
  87                         /*
  88                          * convert command line string to array
  89                          * of parameters (as bootloader does).
  90                          */
  91                         int offt;
  92                         str = (char *)argv + KEXEC_ARGV_SIZE/2;
  93                         memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2);
  94                         ptr = strchr(str, ' ');
  95
  96                         while (ptr && (argc < MAX_ARGS)) {
  97                                 *ptr = '\0';
  98                                 if (ptr[1] != ' ') {
  99                                         offt = (int)(ptr - str + 1);
 100                                         argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt;
 101                                         argc++;
 102                                 }
 103                                 ptr = strchr(ptr + 1, ' ');
 104                         }
 105                         break;
 106                 }
 107         }
 108
 109         if (image->type == KEXEC_TYPE_DEFAULT)
 110                 kexec_argc = argc;
 111         else
 112                 kdump_argc = argc;
 113
 114         /* kexec/kdump need a safe page to save reboot_code_buffer */
 115         image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);
 116
 117         return 0;
 118 }
 119
 120 static void loongson_kexec_shutdown(void)
 121 {
 122 #ifdef CONFIG_SMP
 123         int cpu;
 124
 125         /* All CPUs go to reboot_code_buffer */
 126         for_each_possible_cpu(cpu)
 127                 if (!cpu_online(cpu))
 128                         cpu_device_up(get_cpu_device(cpu));
 129 #endif
 130         kexec_args[0] = kexec_argc;
 131         kexec_args[1] = fw_arg1;
 132         kexec_args[2] = fw_arg2;
 133         secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
 134         memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
 135         memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
 136 }
 137
 138 static void loongson_crash_shutdown(struct pt_regs *regs)
 139 {
 140         default_machine_crash_shutdown(regs);
 141         kexec_args[0] = kdump_argc;
 142         kexec_args[1] = fw_arg1;
 143         kexec_args[2] = fw_arg2;
 144         secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
 145         memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
 146         memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
 147 }
 148
 149 #endif
 150
 151 static int __init mips_reboot_setup(void)
 152 {
 153         _machine_restart = loongson_restart;
 154         _machine_halt = loongson_halt;
 155         pm_power_off = loongson_poweroff;
 156
 157 #ifdef CONFIG_KEXEC
 158         kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
 159         kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
 160         kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
 161         fw_arg1 = KEXEC_ARGV_ADDR;
 162         memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
 163
 164         _machine_kexec_prepare = loongson_kexec_prepare;
 165         _machine_kexec_shutdown = loongson_kexec_shutdown;
 166         _machine_crash_shutdown = loongson_crash_shutdown;
 167 #endif
 168
 169         return 0;
 170 }
 171
 172 arch_initcall(mips_reboot_setup);