8e93807ae5df9e81b6bf2f55e693601c9e667989
[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 __init char *ar71xx_prom_getargv(const char *name)
77 {
78 int len = strlen(name);
79 int i;
80
81 if (!ar71xx_prom_argv)
82 return NULL;
83
84 for (i = 0; i < ar71xx_prom_argc; i++) {
85 char *argv = ar71xx_prom_argv[i];
86
87 if (!argv)
88 continue;
89
90 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
91 return argv + len + 1;
92 }
93
94 return NULL;
95 }
96
97 static __init char *ar71xx_prom_getenv(const char *envname)
98 {
99 int len = strlen(envname);
100 char **env;
101
102 if (!ar71xx_prom_envp)
103 return NULL;
104
105 for (env = ar71xx_prom_envp; *env != NULL; env++)
106 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
107 return *env + len + 1;
108
109 return NULL;
110 }
111
112 static __init unsigned long find_board_byname(char *name)
113 {
114 int i;
115
116 for (i = 0; i < ARRAY_SIZE(boards); i++)
117 if (strcmp(name, boards[i].name) == 0)
118 return boards[i].mach_type;
119
120 return AR71XX_MACH_GENERIC;
121 }
122
123 static int ar71xx_prom_init_myloader(void)
124 {
125 struct myloader_info *mylo;
126
127 mylo = myloader_get_info();
128 if (!mylo)
129 return 0;
130
131 switch (mylo->did) {
132 case DEVID_COMPEX_WP543:
133 ar71xx_mach_type = AR71XX_MACH_WP543;
134 break;
135 default:
136 printk(KERN_WARNING "prom: unknown device id: %x\n",
137 mylo->did);
138 }
139 ar71xx_set_mac_base(mylo->macs[0]);
140
141 return 1;
142 }
143
144 static void ar71xx_prom_init_generic(void)
145 {
146 char *p;
147
148 ar71xx_prom_argc = fw_arg0;
149 ar71xx_prom_argv = (char **)fw_arg1;
150 ar71xx_prom_envp = (char **)fw_arg2;
151
152 p = ar71xx_prom_getenv("board");
153 if (!p)
154 p = ar71xx_prom_getargv("board");
155 if (p)
156 ar71xx_mach_type = find_board_byname(p);
157
158 p = ar71xx_prom_getenv("ethaddr");
159 if (!p)
160 p = ar71xx_prom_getargv("kmac");
161 if (p)
162 ar71xx_parse_mac_addr(p);
163 }
164
165 void __init prom_init(void)
166 {
167 printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
168 "fw_arg2=%08x, fw_arg3=%08x\n",
169 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
170 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
171
172 ar71xx_mach_type = AR71XX_MACH_GENERIC;
173
174 if (ar71xx_prom_init_myloader())
175 return;
176
177 ar71xx_prom_init_generic();
178 }
179
180 void __init prom_free_prom_memory(void)
181 {
182 /* We do not have to prom memory to free */
183 }
184
185 #define UART_READ(r) \
186 __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
187
188 #define UART_WRITE(r, v) \
189 __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
190
191 void prom_putchar(unsigned char ch)
192 {
193 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
194 UART_WRITE(UART_TX, ch);
195 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
196 }