[ar71xx] parse RedBoot environments as well (patch by Jonas <jmajau@ubnt.com>)
[openwrt/svn-archive/archive.git] / target / linux / ar71xx / files / arch / mips / ar71xx / prom.c
1 /*
2 * Atheros AR71xx SoC specific prom routines
3 *
4 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/serial_reg.h>
16
17 #include <asm/bootinfo.h>
18 #include <asm/addrspace.h>
19 #include <asm/fw/myloader/myloader.h>
20
21 #include <asm/mach-ar71xx/ar71xx.h>
22 #include <asm/mach-ar71xx/platform.h>
23
24 struct board_rec {
25 char *name;
26 unsigned long mach_type;
27 };
28
29 static int ar71xx_prom_argc __initdata;
30 static char **ar71xx_prom_argv __initdata;
31 static char **ar71xx_prom_envp __initdata;
32
33 static struct board_rec boards[] __initdata = {
34 {
35 .name = "411",
36 .mach_type = AR71XX_MACH_RB_411,
37 }, {
38 .name = "433",
39 .mach_type = AR71XX_MACH_RB_433,
40 }, {
41 .name = "450",
42 .mach_type = AR71XX_MACH_RB_450,
43 }, {
44 .name = "493",
45 .mach_type = AR71XX_MACH_RB_493,
46 }, {
47 .name = "AW-NR580",
48 .mach_type = AR71XX_MACH_AW_NR580,
49 }, {
50 .name = "AP83",
51 .mach_type = AR71XX_MACH_AP83,
52 }, {
53 .name = "TEW-632BRP",
54 .mach_type = AR71XX_MACH_TEW_632BRP,
55 }, {
56 .name = "UBNT-RS",
57 .mach_type = AR71XX_MACH_UBNT_RS,
58 }, {
59 .name = "UBNT-LSX",
60 .mach_type = AR71XX_MACH_UBNT_LSX,
61 }, {
62 .name = "WNR2000",
63 .mach_type = AR71XX_MACH_WNR2000,
64 }, {
65 .name = "PB42",
66 .mach_type = AR71XX_MACH_PB42,
67 }, {
68 .name = "MZK-W300NH",
69 .mach_type = AR71XX_MACH_MZK_W300NH,
70 }, {
71 .name = "MZK-W04NU",
72 .mach_type = AR71XX_MACH_MZK_W04NU,
73 }
74 };
75
76 static inline int is_valid_ram_addr(void *addr)
77 {
78 if (((u32) addr > KSEG0) &&
79 ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
80 return 1;
81
82 if (((u32) addr > KSEG1) &&
83 ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
84 return 1;
85
86 return 0;
87 }
88
89 static __init char *ar71xx_prom_getargv(const char *name)
90 {
91 int len = strlen(name);
92 int i;
93
94 if (!is_valid_ram_addr(ar71xx_prom_argv))
95 return NULL;
96
97 for (i = 0; i < ar71xx_prom_argc; i++) {
98 char *argv = ar71xx_prom_argv[i];
99
100 if (!is_valid_ram_addr(argv))
101 continue;
102
103 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
104 return argv + len + 1;
105 }
106
107 return NULL;
108 }
109
110 static __init char *ar71xx_prom_getenv(const char *envname)
111 {
112 int len = strlen(envname);
113 char **env;
114
115 if (!is_valid_ram_addr(ar71xx_prom_envp))
116 return NULL;
117
118 for (env = ar71xx_prom_envp; is_valid_ram_addr(*env); env++) {
119 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
120 return *env + len + 1;
121
122 /* RedBoot env comes in pointer pairs - key, value */
123 if (strncmp(envname, *env, len) == 0 && (*env)[len] == 0)
124 if (is_valid_ram_addr(*(++env)))
125 return *env;
126 }
127
128 return NULL;
129 }
130
131 static __init unsigned long 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 return boards[i].mach_type;
138
139 return AR71XX_MACH_GENERIC;
140 }
141
142 static int ar71xx_prom_init_myloader(void)
143 {
144 struct myloader_info *mylo;
145
146 mylo = myloader_get_info();
147 if (!mylo)
148 return 0;
149
150 switch (mylo->did) {
151 case DEVID_COMPEX_WP543:
152 ar71xx_mach_type = AR71XX_MACH_WP543;
153 break;
154 default:
155 printk(KERN_WARNING "prom: unknown device id: %x\n",
156 mylo->did);
157 }
158 ar71xx_set_mac_base(mylo->macs[0]);
159
160 return 1;
161 }
162
163 static void ar71xx_prom_init_generic(void)
164 {
165 char *p;
166
167 ar71xx_prom_argc = fw_arg0;
168 ar71xx_prom_argv = (char **)fw_arg1;
169 ar71xx_prom_envp = (char **)fw_arg2;
170
171 p = ar71xx_prom_getenv("board");
172 if (!p)
173 p = ar71xx_prom_getargv("board");
174 if (p)
175 ar71xx_mach_type = find_board_byname(p);
176
177 p = ar71xx_prom_getenv("ethaddr");
178 if (!p)
179 p = ar71xx_prom_getargv("kmac");
180 if (p)
181 ar71xx_parse_mac_addr(p);
182 }
183
184 void __init prom_init(void)
185 {
186 printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
187 "fw_arg2=%08x, fw_arg3=%08x\n",
188 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
189 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
190
191 ar71xx_mach_type = AR71XX_MACH_GENERIC;
192
193 if (ar71xx_prom_init_myloader())
194 return;
195
196 ar71xx_prom_init_generic();
197 }
198
199 void __init prom_free_prom_memory(void)
200 {
201 /* We do not have to prom memory to free */
202 }
203
204 #define UART_READ(r) \
205 __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
206
207 #define UART_WRITE(r, v) \
208 __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
209
210 void prom_putchar(unsigned char ch)
211 {
212 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
213 UART_WRITE(UART_TX, ch);
214 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
215 }