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-rw-r--r--arch/mips/loongson64/reset.c185
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 000000000..e42080004
--- /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);