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/reboot.h>
15 #include <linux/slab.h>
16
17 #include <asm/bootinfo.h>
18 #include <asm/idle.h>
19 #include <asm/reboot.h>
20 #include <asm/bug.h>
21
22 #include <loongson.h>
23 #include <boot_param.h>
24
25 static int firmware_restart(struct sys_off_data *unusedd)
26 {
27
28 void (*fw_restart)(void) = (void *)loongson_sysconf.restart_addr;
29
30 fw_restart();
31 return NOTIFY_DONE;
32 }
33
34 static int firmware_poweroff(struct sys_off_data *unused)
35 {
36 void (*fw_poweroff)(void) = (void *)loongson_sysconf.poweroff_addr;
37
38 fw_poweroff();
39 return NOTIFY_DONE;
40 }
41
42 #ifdef CONFIG_KEXEC_CORE
43
44 /* 0X80000000~0X80200000 is safe */
45 #define MAX_ARGS 64
46 #define KEXEC_CTRL_CODE 0xFFFFFFFF80100000UL
47 #define KEXEC_ARGV_ADDR 0xFFFFFFFF80108000UL
48 #define KEXEC_ARGV_SIZE COMMAND_LINE_SIZE
49 #define KEXEC_ENVP_SIZE 4800
50
51 static int kexec_argc;
52 static int kdump_argc;
53 static void *kexec_argv;
54 static void *kdump_argv;
55 static void *kexec_envp;
56
57 static int loongson_kexec_prepare(struct kimage *image)
58 {
59 int i, argc = 0;
60 unsigned int *argv;
61 char *str, *ptr, *bootloader = "kexec";
62
63 /* argv at offset 0, argv[] at offset KEXEC_ARGV_SIZE/2 */
64 if (image->type == KEXEC_TYPE_DEFAULT)
65 argv = (unsigned int *)kexec_argv;
66 else
67 argv = (unsigned int *)kdump_argv;
68
69 argv[argc++] = (unsigned int)(KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2);
70
71 for (i = 0; i < image->nr_segments; i++) {
72 if (!strncmp(bootloader, (char *)image->segment[i].buf,
73 strlen(bootloader))) {
74 /*
75 * convert command line string to array
76 * of parameters (as bootloader does).
77 */
78 int offt;
79 str = (char *)argv + KEXEC_ARGV_SIZE/2;
80 memcpy(str, image->segment[i].buf, KEXEC_ARGV_SIZE/2);
81 ptr = strchr(str, ' ');
82
83 while (ptr && (argc < MAX_ARGS)) {
84 *ptr = '\0';
85 if (ptr[1] != ' ') {
86 offt = (int)(ptr - str + 1);
87 argv[argc] = KEXEC_ARGV_ADDR + KEXEC_ARGV_SIZE/2 + offt;
88 argc++;
89 }
90 ptr = strchr(ptr + 1, ' ');
91 }
92 break;
93 }
94 }
95
96 if (image->type == KEXEC_TYPE_DEFAULT)
97 kexec_argc = argc;
98 else
99 kdump_argc = argc;
100
101 /* kexec/kdump need a safe page to save reboot_code_buffer */
102 image->control_code_page = virt_to_page((void *)KEXEC_CTRL_CODE);
103
104 return 0;
105 }
106
107 static void loongson_kexec_shutdown(void)
108 {
109 #ifdef CONFIG_SMP
110 int cpu;
111
112 /* All CPUs go to reboot_code_buffer */
113 for_each_possible_cpu(cpu)
114 if (!cpu_online(cpu))
115 cpu_device_up(get_cpu_device(cpu));
116
117 secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
118 #endif
119 kexec_args[0] = kexec_argc;
120 kexec_args[1] = fw_arg1;
121 kexec_args[2] = fw_arg2;
122 memcpy((void *)fw_arg1, kexec_argv, KEXEC_ARGV_SIZE);
123 memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
124 }
125
126 static void loongson_crash_shutdown(struct pt_regs *regs)
127 {
128 default_machine_crash_shutdown(regs);
129 kexec_args[0] = kdump_argc;
130 kexec_args[1] = fw_arg1;
131 kexec_args[2] = fw_arg2;
132 #ifdef CONFIG_SMP
133 secondary_kexec_args[0] = TO_UNCAC(0x3ff01000);
134 #endif
135 memcpy((void *)fw_arg1, kdump_argv, KEXEC_ARGV_SIZE);
136 memcpy((void *)fw_arg2, kexec_envp, KEXEC_ENVP_SIZE);
137 }
138
139 #endif
140
141 static int __init mips_reboot_setup(void)
142 {
143 if (loongson_sysconf.restart_addr) {
144 register_sys_off_handler(SYS_OFF_MODE_RESTART,
145 SYS_OFF_PRIO_FIRMWARE,
146 firmware_restart, NULL);
147 }
148
149 if (loongson_sysconf.poweroff_addr) {
150 register_sys_off_handler(SYS_OFF_MODE_POWER_OFF,
151 SYS_OFF_PRIO_FIRMWARE,
152 firmware_poweroff, NULL);
153 }
154
155 #ifdef CONFIG_KEXEC_CORE
156 kexec_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
157 if (WARN_ON(!kexec_argv))
158 return -ENOMEM;
159
160 kdump_argv = kmalloc(KEXEC_ARGV_SIZE, GFP_KERNEL);
161 if (WARN_ON(!kdump_argv))
162 return -ENOMEM;
163
164 kexec_envp = kmalloc(KEXEC_ENVP_SIZE, GFP_KERNEL);
165 if (WARN_ON(!kexec_envp))
166 return -ENOMEM;
167
168 fw_arg1 = KEXEC_ARGV_ADDR;
169 memcpy(kexec_envp, (void *)fw_arg2, KEXEC_ENVP_SIZE);
170
171 _machine_kexec_prepare = loongson_kexec_prepare;
172 _machine_kexec_shutdown = loongson_kexec_shutdown;
173 _machine_crash_shutdown = loongson_crash_shutdown;
174 #endif
175
176 return 0;
177 }
178
179 arch_initcall(mips_reboot_setup);
180
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