ramips: add preliminary support for the DIR-300 revB board
[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 };
46
47 static inline void *to_ram_addr(void *addr)
48 {
49 u32 base;
50
51 base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
52 if (((u32) addr > base) &&
53 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
54 return addr;
55
56 base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
57 if (((u32) addr > base) &&
58 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
59 return addr;
60
61 /* some U-Boot variants uses physical addresses */
62 base = RALINK_SOC_SDRAM_BASE;
63 if (((u32) addr > base) &&
64 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
65 return (void *)KSEG0ADDR(addr);
66
67 return NULL;
68 }
69
70 static __init char *ramips_prom_getargv(const char *name)
71 {
72 int len = strlen(name);
73 int i;
74
75 if (!ramips_prom_argv) {
76 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
77 ramips_prom_argv);
78 return NULL;
79 }
80
81 for (i = 0; i < ramips_prom_argc; i++) {
82 char *argv = to_ram_addr(ramips_prom_argv[i]);
83
84 if (!argv) {
85 printk(KERN_DEBUG
86 "argv[%d]=%p is invalid, skipping\n",
87 i, ramips_prom_argv[i]);
88 continue;
89 }
90
91 printk(KERN_DEBUG "argv[%d]: %s\n", i, argv);
92 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
93 return argv + len + 1;
94 }
95
96 return NULL;
97 }
98
99 static __init char *ramips_prom_getenv(const char *envname)
100 {
101 #define PROM_MAX_ENVS 256
102 int len = strlen(envname);
103 char **env;
104 int i;
105
106 env = ramips_prom_envp;
107 if (!env) {
108 printk(KERN_DEBUG "envp=%p is not in RAM, skipping\n",
109 ramips_prom_envp);
110 return NULL;
111 }
112
113 for (i = 0; i < PROM_MAX_ENVS; i++) {
114 char *p = to_ram_addr(env[i]);
115
116 if (!p)
117 break;
118
119 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
120 if (strncmp(envname, p, len) == 0 && p[len] == '=')
121 return p + len + 1;
122 }
123
124 return NULL;
125 #undef PROM_MAX_ENVS
126 }
127
128 static __init void find_board_byname(char *name)
129 {
130 int i;
131
132 for (i = 0; i < ARRAY_SIZE(boards); i++)
133 if (strcmp(name, boards[i].name) == 0) {
134 ramips_mach = boards[i].mach_type;
135 break;
136 }
137 }
138
139 void __init prom_init(void)
140 {
141 char *p;
142
143 printk(KERN_DEBUG
144 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
145 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
146 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
147
148 ramips_prom_argc = fw_arg0;
149 ramips_prom_argv = to_ram_addr((void *)fw_arg1);
150 ramips_prom_envp = to_ram_addr((void *)fw_arg2);
151
152 p = ramips_prom_getargv("board");
153 if (!p)
154 p = ramips_prom_getenv("board");
155 if (p)
156 find_board_byname(p);
157 }
158
159 void __init prom_free_prom_memory(void)
160 {
161 /* We do not have to prom memory to free */
162 }