add preliminary support for the Ubiquiti LS-SR71 board (thanks to Xianghua Xiao for...
[librecmc/librecmc.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-LS-SR71",
60                 .mach_type      = AR71XX_MACH_UBNT_LSSR71,
61         }, {
62                 .name           = "UBNT-LSX",
63                 .mach_type      = AR71XX_MACH_UBNT_LSX,
64         }, {
65                 .name           = "WNR2000",
66                 .mach_type      = AR71XX_MACH_WNR2000,
67         }, {
68                 .name           = "PB42",
69                 .mach_type      = AR71XX_MACH_PB42,
70         }, {
71                 .name           = "MZK-W300NH",
72                 .mach_type      = AR71XX_MACH_MZK_W300NH,
73         }, {
74                 .name           = "MZK-W04NU",
75                 .mach_type      = AR71XX_MACH_MZK_W04NU,
76         }
77 };
78
79 static inline int is_valid_ram_addr(void *addr)
80 {
81         if (((u32) addr > KSEG0) &&
82             ((u32) addr < (KSEG0 + AR71XX_MEM_SIZE_MAX)))
83                 return 1;
84
85         if (((u32) addr > KSEG1) &&
86             ((u32) addr < (KSEG1 + AR71XX_MEM_SIZE_MAX)))
87                 return 1;
88
89         return 0;
90 }
91
92 static __init char *ar71xx_prom_getargv(const char *name)
93 {
94         int len = strlen(name);
95         int i;
96
97         if (!is_valid_ram_addr(ar71xx_prom_argv))
98                 return NULL;
99
100         for (i = 0; i < ar71xx_prom_argc; i++) {
101                 char *argv = ar71xx_prom_argv[i];
102
103                 if (!is_valid_ram_addr(argv))
104                         continue;
105
106                 if (strncmp(name, argv, len) == 0 && (argv)[len] == '=')
107                         return argv + len + 1;
108         }
109
110         return NULL;
111 }
112
113 static __init char *ar71xx_prom_getenv(const char *envname)
114 {
115         int len = strlen(envname);
116         char **env;
117
118         if (!is_valid_ram_addr(ar71xx_prom_envp))
119                 return NULL;
120
121         for (env = ar71xx_prom_envp; is_valid_ram_addr(*env); env++) {
122                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == '=')
123                         return *env + len + 1;
124
125                 /* RedBoot env comes in pointer pairs - key, value */
126                 if (strncmp(envname, *env, len) == 0 && (*env)[len] == 0)
127                         if (is_valid_ram_addr(*(++env)))
128                                 return *env;
129         }
130
131         return NULL;
132 }
133
134 static __init unsigned long find_board_byname(char *name)
135 {
136         int i;
137
138         for (i = 0; i < ARRAY_SIZE(boards); i++)
139                 if (strcmp(name, boards[i].name) == 0)
140                         return boards[i].mach_type;
141
142         return AR71XX_MACH_GENERIC;
143 }
144
145 static int ar71xx_prom_init_myloader(void)
146 {
147         struct myloader_info *mylo;
148
149         mylo = myloader_get_info();
150         if (!mylo)
151                 return 0;
152
153         switch (mylo->did) {
154         case DEVID_COMPEX_WP543:
155                 ar71xx_mach_type = AR71XX_MACH_WP543;
156                 break;
157         default:
158                 printk(KERN_WARNING "prom: unknown device id: %x\n",
159                                 mylo->did);
160         }
161         ar71xx_set_mac_base(mylo->macs[0]);
162
163         return 1;
164 }
165
166 static void ar71xx_prom_init_generic(void)
167 {
168         char *p;
169
170         ar71xx_prom_argc = fw_arg0;
171         ar71xx_prom_argv = (char **)fw_arg1;
172         ar71xx_prom_envp = (char **)fw_arg2;
173
174         p = ar71xx_prom_getargv("board");
175         if (!p)
176                 p = ar71xx_prom_getenv("board");
177         if (p)
178                 ar71xx_mach_type = find_board_byname(p);
179
180         p = ar71xx_prom_getenv("ethaddr");
181         if (!p)
182                 p = ar71xx_prom_getargv("kmac");
183         if (p)
184                 ar71xx_parse_mac_addr(p);
185 }
186
187 void __init prom_init(void)
188 {
189         printk(KERN_DEBUG "prom: fw_arg0=%08x, fw_arg1=%08x, "
190                         "fw_arg2=%08x, fw_arg3=%08x\n",
191                         (unsigned int)fw_arg0, (unsigned int)fw_arg1,
192                         (unsigned int)fw_arg2, (unsigned int)fw_arg3);
193
194         ar71xx_mach_type = AR71XX_MACH_GENERIC;
195
196         if (ar71xx_prom_init_myloader())
197                 return;
198
199         ar71xx_prom_init_generic();
200 }
201
202 void __init prom_free_prom_memory(void)
203 {
204         /* We do not have to prom memory to free */
205 }
206
207 #define UART_READ(r) \
208         __raw_readl((void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4 * (r)))
209
210 #define UART_WRITE(r, v) \
211         __raw_writel((v), (void __iomem *)(KSEG1ADDR(AR71XX_UART_BASE) + 4*(r)))
212
213 void prom_putchar(unsigned char ch)
214 {
215         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
216         UART_WRITE(UART_TX, ch);
217         while (((UART_READ(UART_LSR)) & UART_LSR_THRE) == 0);
218 }