587f1611077edb02b3286c020361100660f7953b
[openwrt/openwrt.git] / target / linux / ramips / files / arch / mips / ralink / common / prom.c
1 /*
2 * Ralink SoC specific prom routines
3 *
4 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/string.h>
14
15 #include <asm/bootinfo.h>
16 #include <asm/addrspace.h>
17
18 #include <asm/mach-ralink/common.h>
19 #include <asm/mach-ralink/machine.h>
20 #include <ralink_soc.h>
21
22 struct board_rec {
23 char *name;
24 enum ramips_mach_type mach_type;
25 };
26
27 static int ramips_prom_argc __initdata;
28 static char **ramips_prom_argv __initdata;
29 static char **ramips_prom_envp __initdata;
30
31 static struct board_rec boards[] __initdata = {
32 {
33 .name = "RT-N15",
34 .mach_type = RAMIPS_MACH_RT_N15,
35 }, {
36 .name = "DIR-300-revB",
37 .mach_type = RAMIPS_MACH_DIR_300_REVB,
38 }, {
39 .name = "V22RW-2X2",
40 .mach_type = RAMIPS_MACH_V22RW_2X2,
41 }, {
42 .name = "WHR-G300N",
43 .mach_type = RAMIPS_MACH_WHR_G300N,
44 }, {
45 .name = "FONERA20N",
46 .mach_type = RAMIPS_MACH_FONERA20N,
47 }
48 };
49
50 static inline void *to_ram_addr(void *addr)
51 {
52 u32 base;
53
54 base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
55 if (((u32) addr > base) &&
56 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
57 return addr;
58
59 base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
60 if (((u32) addr > base) &&
61 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
62 return addr;
63
64 /* some U-Boot variants uses physical addresses */
65 base = RALINK_SOC_SDRAM_BASE;
66 if (((u32) addr > base) &&
67 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
68 return (void *)KSEG0ADDR(addr);
69
70 return NULL;
71 }
72
73 static __init char *ramips_prom_getargv(const char *name)
74 {
75 int len = strlen(name);
76 int i;
77
78 if (!ramips_prom_argv) {
79 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
80 ramips_prom_argv);
81 return NULL;
82 }
83
84 for (i = 0; i < ramips_prom_argc; i++) {
85 char *argv = to_ram_addr(ramips_prom_argv[i]);
86
87 if (!argv) {
88 printk(KERN_DEBUG
89 "argv[%d]=%p is invalid, skipping\n",
90 i, ramips_prom_argv[i]);
91 continue;
92 }
93
94 printk(KERN_DEBUG "argv[%d]: %s\n", i, argv);
95 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
96 return argv + len + 1;
97 }
98
99 return NULL;
100 }
101
102 static __init char *ramips_prom_getenv(const char *envname)
103 {
104 #define PROM_MAX_ENVS 256
105 int len = strlen(envname);
106 char **env;
107 int i;
108
109 env = ramips_prom_envp;
110 if (!env) {
111 printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
112 ramips_prom_envp);
113 return NULL;
114 }
115
116 for (i = 0; i < PROM_MAX_ENVS; i++) {
117 char *p = to_ram_addr(env[i]);
118
119 if (!p)
120 break;
121
122 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
123 if (strncmp(envname, p, len) == 0 && p[len] == '=')
124 return p + len + 1;
125 }
126
127 return NULL;
128 #undef PROM_MAX_ENVS
129 }
130
131 static __init void find_board_byname(char *name)
132 {
133 int i;
134
135 for (i = 0; i < ARRAY_SIZE(boards); i++)
136 if (strcmp(name, boards[i].name) == 0) {
137 ramips_mach = boards[i].mach_type;
138 break;
139 }
140 }
141
142 void __init prom_init(void)
143 {
144 char *p;
145
146 printk(KERN_DEBUG
147 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
148 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
149 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
150
151 ramips_prom_argc = fw_arg0;
152 ramips_prom_argv = to_ram_addr((void *)fw_arg1);
153 ramips_prom_envp = to_ram_addr((void *)fw_arg2);
154
155 p = ramips_prom_getargv("board");
156 if (!p)
157 p = ramips_prom_getenv("board");
158 if (p)
159 find_board_byname(p);
160 }
161
162 void __init prom_free_prom_memory(void)
163 {
164 /* We do not have to prom memory to free */
165 }