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121915c4 WB |
1 | /* |
2 | * BCM947xx nvram variable access | |
3 | * | |
4 | * Copyright (C) 2005 Broadcom Corporation | |
5 | * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org> | |
f36738dd | 6 | * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> |
121915c4 WB |
7 | * |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2 of the License, or (at your | |
11 | * option) any later version. | |
12 | */ | |
13 | ||
14 | #include <linux/init.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/ssb/ssb.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/string.h> | |
20 | #include <asm/addrspace.h> | |
111bd981 | 21 | #include <bcm47xx_nvram.h> |
121915c4 WB |
22 | #include <asm/mach-bcm47xx/bcm47xx.h> |
23 | ||
24 | static char nvram_buf[NVRAM_SPACE]; | |
25 | ||
f36738dd HM |
26 | static u32 find_nvram_size(u32 end) |
27 | { | |
28 | struct nvram_header *header; | |
29 | u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000}; | |
30 | int i; | |
31 | ||
32 | for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) { | |
33 | header = (struct nvram_header *)KSEG1ADDR(end - nvram_sizes[i]); | |
34 | if (header->magic == NVRAM_HEADER) | |
35 | return nvram_sizes[i]; | |
36 | } | |
37 | ||
38 | return 0; | |
39 | } | |
40 | ||
41 | /* Probe for NVRAM header */ | |
cc4403e0 | 42 | static int nvram_find_and_copy(u32 base, u32 lim) |
121915c4 | 43 | { |
121915c4 WB |
44 | struct nvram_header *header; |
45 | int i; | |
08ccf572 | 46 | u32 off; |
121915c4 | 47 | u32 *src, *dst; |
f36738dd | 48 | u32 size; |
121915c4 | 49 | |
c4485671 | 50 | /* TODO: when nvram is on nand flash check for bad blocks first. */ |
121915c4 WB |
51 | off = FLASH_MIN; |
52 | while (off <= lim) { | |
53 | /* Windowed flash access */ | |
f36738dd HM |
54 | size = find_nvram_size(base + off); |
55 | if (size) { | |
56 | header = (struct nvram_header *)KSEG1ADDR(base + off - | |
57 | size); | |
121915c4 | 58 | goto found; |
f36738dd | 59 | } |
121915c4 WB |
60 | off <<= 1; |
61 | } | |
62 | ||
63 | /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */ | |
64 | header = (struct nvram_header *) KSEG1ADDR(base + 4096); | |
f36738dd HM |
65 | if (header->magic == NVRAM_HEADER) { |
66 | size = NVRAM_SPACE; | |
121915c4 | 67 | goto found; |
f36738dd | 68 | } |
121915c4 WB |
69 | |
70 | header = (struct nvram_header *) KSEG1ADDR(base + 1024); | |
f36738dd HM |
71 | if (header->magic == NVRAM_HEADER) { |
72 | size = NVRAM_SPACE; | |
121915c4 | 73 | goto found; |
f36738dd | 74 | } |
121915c4 | 75 | |
f36738dd | 76 | pr_err("no nvram found\n"); |
cc4403e0 | 77 | return -ENXIO; |
121915c4 WB |
78 | |
79 | found: | |
f36738dd HM |
80 | |
81 | if (header->len > size) | |
82 | pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n"); | |
83 | if (header->len > NVRAM_SPACE) | |
84 | pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n", | |
85 | header->len, NVRAM_SPACE); | |
86 | ||
121915c4 WB |
87 | src = (u32 *) header; |
88 | dst = (u32 *) nvram_buf; | |
89 | for (i = 0; i < sizeof(struct nvram_header); i += 4) | |
90 | *dst++ = *src++; | |
f36738dd | 91 | for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4) |
121915c4 | 92 | *dst++ = le32_to_cpu(*src++); |
f36738dd | 93 | memset(dst, 0x0, NVRAM_SPACE - i); |
cc4403e0 HM |
94 | |
95 | return 0; | |
121915c4 WB |
96 | } |
97 | ||
bb765632 | 98 | #ifdef CONFIG_BCM47XX_SSB |
cc4403e0 | 99 | static int nvram_init_ssb(void) |
bb765632 RM |
100 | { |
101 | struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore; | |
102 | u32 base; | |
103 | u32 lim; | |
104 | ||
105 | if (mcore->pflash.present) { | |
106 | base = mcore->pflash.window; | |
107 | lim = mcore->pflash.window_size; | |
108 | } else { | |
109 | pr_err("Couldn't find supported flash memory\n"); | |
cc4403e0 | 110 | return -ENXIO; |
bb765632 RM |
111 | } |
112 | ||
cc4403e0 | 113 | return nvram_find_and_copy(base, lim); |
bb765632 RM |
114 | } |
115 | #endif | |
116 | ||
117 | #ifdef CONFIG_BCM47XX_BCMA | |
cc4403e0 | 118 | static int nvram_init_bcma(void) |
bb765632 RM |
119 | { |
120 | struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc; | |
121 | u32 base; | |
122 | u32 lim; | |
123 | ||
c4485671 HM |
124 | #ifdef CONFIG_BCMA_NFLASH |
125 | if (cc->nflash.boot) { | |
126 | base = BCMA_SOC_FLASH1; | |
127 | lim = BCMA_SOC_FLASH1_SZ; | |
128 | } else | |
129 | #endif | |
bb765632 RM |
130 | if (cc->pflash.present) { |
131 | base = cc->pflash.window; | |
132 | lim = cc->pflash.window_size; | |
133 | #ifdef CONFIG_BCMA_SFLASH | |
134 | } else if (cc->sflash.present) { | |
135 | base = cc->sflash.window; | |
136 | lim = cc->sflash.size; | |
137 | #endif | |
138 | } else { | |
139 | pr_err("Couldn't find supported flash memory\n"); | |
cc4403e0 | 140 | return -ENXIO; |
bb765632 RM |
141 | } |
142 | ||
cc4403e0 | 143 | return nvram_find_and_copy(base, lim); |
bb765632 RM |
144 | } |
145 | #endif | |
146 | ||
e58da16f | 147 | static int nvram_init(void) |
bb765632 RM |
148 | { |
149 | switch (bcm47xx_bus_type) { | |
150 | #ifdef CONFIG_BCM47XX_SSB | |
151 | case BCM47XX_BUS_TYPE_SSB: | |
cc4403e0 | 152 | return nvram_init_ssb(); |
bb765632 RM |
153 | #endif |
154 | #ifdef CONFIG_BCM47XX_BCMA | |
155 | case BCM47XX_BUS_TYPE_BCMA: | |
cc4403e0 | 156 | return nvram_init_bcma(); |
bb765632 RM |
157 | #endif |
158 | } | |
cc4403e0 | 159 | return -ENXIO; |
bb765632 RM |
160 | } |
161 | ||
111bd981 | 162 | int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len) |
121915c4 WB |
163 | { |
164 | char *var, *value, *end, *eq; | |
cc4403e0 | 165 | int err; |
121915c4 WB |
166 | |
167 | if (!name) | |
ee7e2f3c | 168 | return -EINVAL; |
121915c4 | 169 | |
cc4403e0 | 170 | if (!nvram_buf[0]) { |
e58da16f | 171 | err = nvram_init(); |
cc4403e0 HM |
172 | if (err) |
173 | return err; | |
174 | } | |
121915c4 WB |
175 | |
176 | /* Look for name=value and return value */ | |
177 | var = &nvram_buf[sizeof(struct nvram_header)]; | |
178 | end = nvram_buf + sizeof(nvram_buf) - 2; | |
179 | end[0] = end[1] = '\0'; | |
180 | for (; *var; var = value + strlen(value) + 1) { | |
181 | eq = strchr(var, '='); | |
182 | if (!eq) | |
183 | break; | |
184 | value = eq + 1; | |
185 | if ((eq - var) == strlen(name) && | |
186 | strncmp(var, name, (eq - var)) == 0) { | |
44d4b2ae | 187 | return snprintf(val, val_len, "%s", value); |
121915c4 WB |
188 | } |
189 | } | |
ee7e2f3c | 190 | return -ENOENT; |
121915c4 | 191 | } |
111bd981 | 192 | EXPORT_SYMBOL(bcm47xx_nvram_getenv); |