1b7b3a750aa766ae9c17170e07f547a59a99d1f5
[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 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 };
57
58 static __init char *ar71xx_prom_getargv(const char *name)
59 {
60 int len = strlen(name);
61 int i;
62
63 if (!ar71xx_prom_argv)
64 return NULL;
65
66 for (i = 0; i < ar71xx_prom_argc; i++) {
67 char *argv = ar71xx_prom_argv[i];
68
69 if (!argv)
70 continue;
71
72 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
73 return argv + len + 1;
74 }
75
76 return NULL;
77 }
78
79 static __init char *ar71xx_prom_getenv(const char *envname)
80 {
81 int len = strlen(envname);
82 char **env;
83
84 if (!ar71xx_prom_envp)
85 return NULL;
86
87 for (env = ar71xx_prom_envp; *env != NULL; env++)
88 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
89 return *env + len + 1;
90
91 return NULL;
92 }
93
94 static __init unsigned long find_board_byname(char *name)
95 {
96 int i;
97
98 for (i = 0; i < ARRAY_SIZE(boards); i++)
99 if (strcmp(name, boards[i].name) == 0)
100 return boards[i].mach_type;
101
102 return AR71XX_MACH_GENERIC;
103 }
104
105 static int ar71xx_prom_init_myloader(void)
106 {
107 struct myloader_info *mylo;
108
109 mylo = myloader_get_info();
110 if (!mylo)
111 return 0;
112
113 switch (mylo->did) {
114 case DEVID_COMPEX_WP543:
115 ar71xx_mach_type = AR71XX_MACH_WP543;
116 break;
117 default:
118 printk(KERN_WARNING "prom: unknown device id: %x\n",
119 mylo->did);
120 }
121 ar71xx_set_mac_base(mylo->macs[0]);
122
123 return 1;
124 }
125
126 static void ar71xx_prom_init_generic(void)
127 {
128 char *p;
129
130 ar71xx_prom_argc = fw_arg0;
131 ar71xx_prom_argv = (char **)fw_arg1;
132 ar71xx_prom_envp = (char **)fw_arg2;
133
134 p = ar71xx_prom_getenv("board");
135 if (!p)
136 p = ar71xx_prom_getargv("board");
137 if (p)
138 ar71xx_mach_type = find_board_byname(p);
139
140 p = ar71xx_prom_getenv("ethaddr");
141 if (!p)
142 p = ar71xx_prom_getargv("kmac");
143 if (p)
144 ar71xx_parse_mac_addr(p);
145 }
146
147 void __init prom_init(void)
148 {
149 printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
150 "fw_arg2=%08x, fw_arg3=%08x\n",
151 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
152 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
153
154 ar71xx_mach_type = AR71XX_MACH_GENERIC;
155
156 if (ar71xx_prom_init_myloader())
157 return;
158
159 ar71xx_prom_init_generic();
160 }
161
162 void __init prom_free_prom_memory(void)
163 {
164 /* We do not have to prom memory to free */
165 }
166
167 #define UART_READ(r) \
168 __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
169
170 #define UART_WRITE(r, v) \
171 __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
172
173 void prom_putchar(unsigned char ch)
174 {
175 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
176 UART_WRITE(UART_TX, ch);
177 while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
178 }