LXR linux/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
  23static 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
  35static 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
  46static 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
  64static int kexec_argc;
  65static int kdump_argc;
  66static void *kexec_argv;
  67static void *kdump_argv;
  68static void *kexec_envp;
  69
  70static 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
 120static 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
 130        secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
 131#endif
 132        kexec_args[0] = kexec_argc;
 133        kexec_args[1] = fw_arg1;
 134        kexec_args[2] = fw_arg2;
 135        memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
 136        memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
 137}
 138
 139static void loongson_crash_shutdown(struct pt_regs *regs)
 140{
 141        default_machine_crash_shutdown(regs);
 142        kexec_args[0] = kdump_argc;
 143        kexec_args[1] = fw_arg1;
 144        kexec_args[2] = fw_arg2;
 145#ifdef CONFIG_SMP
 146        secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
 147#endif
 148        memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
 149        memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
 150}
 151
 152#endif
 153
 154static int __init mips_reboot_setup(void)
 155{
 156        _machine_restart = loongson_restart;
 157        _machine_halt = loongson_halt;
 158        pm_power_off = loongson_poweroff;
 159
 160#ifdef CONFIG_KEXEC
 161        kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
 162        kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
 163        kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
 164        fw_arg1 = KEXEC_ARGV_ADDR;
 165        memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
 166
 167        _machine_kexec_prepare = loongson_kexec_prepare;
 168        _machine_kexec_shutdown = loongson_kexec_shutdown;
 169        _machine_crash_shutdown = loongson_crash_shutdown;
 170#endif
 171
 172        return 0;
 173}
 174
 175arch_initcall(mips_reboot_setup);
 176