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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Copyright (C) 2007 Lemote, Inc. & Institute of Computing Technology
* Author: Fuxin Zhang, zhangfx@lemote.com
* Copyright (C) 2009 Lemote, Inc.
* Author: Zhangjin Wu, wuzhangjin@gmail.com
*/
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/kexec.h>
#include <linux/pm.h>
#include <linux/slab.h>
#include <asm/bootinfo.h>
#include <asm/idle.h>
#include <asm/reboot.h>
#include <loongson.h>
#include <boot_param.h>
static void loongson_restart(char *command)
{
void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
fw_restart();
while (1) {
if (cpu_wait)
cpu_wait();
}
}
static void loongson_poweroff(void)
{
void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
fw_poweroff();
while (1) {
if (cpu_wait)
cpu_wait();
}
}
static void loongson_halt(void)
{
pr_notice("\n\n** You can safely turn off the power now **\n\n");
while (1) {
if (cpu_wait)
cpu_wait();
}
}
#ifdef CONFIG_KEXEC
/* 0X80000000~0X80200000 is safe */
#define MAX_ARGS 64
#define KEXEC_CTRL_CODE 0xFFFFFFFF80100000UL
#define KEXEC_ARGV_ADDR 0xFFFFFFFF80108000UL
#define KEXEC_ARGV_SIZE COMMAND_LINE_SIZE
#define KEXEC_ENVP_SIZE 4800
static int kexec_argc;
static int kdump_argc;
static void *kexec_argv;
static void *kdump_argv;
static void *kexec_envp;
static int loongson_kexec_prepare(struct kimage *image)
{
int i, argc = 0;
unsigned int *argv;
char *str, *ptr, *bootloader = "kexec";
/* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */
if (image->type == KEXEC_TYPE_DEFAULT)
argv = (unsigned int *)kexec_argv;
else
argv = (unsigned int *)kdump_argv;
argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2);
for (i = 0; i < image->nr_segments; i++) {
if (!strncmp(bootloader, (char *)image->segment[i].buf,
strlen(bootloader))) {
/*
* convert command line string to array
* of parameters (as bootloader does).
*/
int offt;
str = (char *)argv + KEXEC_ARGV_SIZE/2;
memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2);
ptr = strchr(str, ' ');
while (ptr && (argc < MAX_ARGS)) {
*ptr = '\0';
if (ptr[1] != ' ') {
offt = (int)(ptr - str + 1);
argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt;
argc++;
}
ptr = strchr(ptr + 1, ' ');
}
break;
}
}
if (image->type == KEXEC_TYPE_DEFAULT)
kexec_argc = argc;
else
kdump_argc = argc;
/* kexec/kdump need a safe page to save reboot_code_buffer */
image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);
return 0;
}
static void loongson_kexec_shutdown(void)
{
#ifdef CONFIG_SMP
int cpu;
/* All CPUs go to reboot_code_buffer */
for_each_possible_cpu(cpu)
if (!cpu_online(cpu))
cpu_device_up(get_cpu_device(cpu));
#endif
kexec_args[0] = kexec_argc;
kexec_args[1] = fw_arg1;
kexec_args[2] = fw_arg2;
secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
}
static void loongson_crash_shutdown(struct pt_regs *regs)
{
default_machine_crash_shutdown(regs);
kexec_args[0] = kdump_argc;
kexec_args[1] = fw_arg1;
kexec_args[2] = fw_arg2;
secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
}
#endif
static int __init mips_reboot_setup(void)
{
_machine_restart = loongson_restart;
_machine_halt = loongson_halt;
pm_power_off = loongson_poweroff;
#ifdef CONFIG_KEXEC
kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
fw_arg1 = KEXEC_ARGV_ADDR;
memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
_machine_kexec_prepare = loongson_kexec_prepare;
_machine_kexec_shutdown = loongson_kexec_shutdown;
_machine_crash_shutdown = loongson_crash_shutdown;
#endif
return 0;
}
arch_initcall(mips_reboot_setup);
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