diff options
Diffstat (limited to 'arch/mips/loongson64/reset.c')
| -rw-r--r-- | arch/mips/loongson64/reset.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/arch/mips/loongson64/reset.c b/arch/mips/loongson64/reset.c new file mode 100644 index 0000000000..e420800043 --- /dev/null +++ b/arch/mips/loongson64/reset.c @@ -0,0 +1,185 @@ +// 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 <asm/bug.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)); + + secondary_kexec_args[0] = TO_UNCAC(0x3ff01000); +#endif + kexec_args[0] = kexec_argc; + kexec_args[1] = fw_arg1; + kexec_args[2] = fw_arg2; + 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; +#ifdef CONFIG_SMP + secondary_kexec_args[0] = TO_UNCAC(0x3ff01000); +#endif + 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); + if (WARN_ON(!kexec_argv)) + return -ENOMEM; + + kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL); + if (WARN_ON(!kdump_argv)) + return -ENOMEM; + + kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL); + if (WARN_ON(!kexec_envp)) + return -ENOMEM; + + 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); |