Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 1 | /* |
| 2 | * BCM947xx nvram variable access |
| 3 | * |
| 4 | * Copyright (C) 2005 Broadcom Corporation |
| 5 | * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org> |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 6 | * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de> |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 7 | * |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 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 |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 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> |
Hauke Mehrtens | 111bd98 | 2012-12-26 19:51:14 +0000 | [diff] [blame] | 21 | #include <bcm47xx_nvram.h> |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 22 | #include <asm/mach-bcm47xx/bcm47xx.h> |
| 23 | |
| 24 | static char nvram_buf[NVRAM_SPACE]; |
| 25 | |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 26 | static u32 find_nvram_size(u32 end) |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 27 | { |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 28 | struct nvram_header *header; |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 29 | u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000}; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 30 | int i; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 31 | |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 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]; |
Hauke Mehrtens | 08ccf572 | 2011-07-23 01:20:12 +0200 | [diff] [blame] | 36 | } |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 37 | |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | /* Probe for NVRAM header */ |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 42 | static int nvram_find_and_copy(u32 base, u32 lim) |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 43 | { |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 44 | struct nvram_header *header; |
| 45 | int i; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 46 | u32 off; |
| 47 | u32 *src, *dst; |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 48 | u32 size; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 49 | |
Hauke Mehrtens | c4485671 | 2012-12-26 19:51:11 +0000 | [diff] [blame] | 50 | /* TODO: when nvram is on nand flash check for bad blocks first. */ |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 51 | off = FLASH_MIN; |
| 52 | while (off <= lim) { |
| 53 | /* Windowed flash access */ |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 54 | size = find_nvram_size(base + off); |
| 55 | if (size) { |
| 56 | header = (struct nvram_header *)KSEG1ADDR(base + off - |
| 57 | size); |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 58 | goto found; |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 59 | } |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 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); |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 65 | if (header->magic == NVRAM_HEADER) { |
| 66 | size = NVRAM_SPACE; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 67 | goto found; |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 68 | } |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 69 | |
| 70 | header = (struct nvram_header *) KSEG1ADDR(base + 1024); |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 71 | if (header->magic == NVRAM_HEADER) { |
| 72 | size = NVRAM_SPACE; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 73 | goto found; |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 74 | } |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 75 | |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 76 | pr_err("no nvram found\n"); |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 77 | return -ENXIO; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 78 | |
| 79 | found: |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 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 | |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 87 | src = (u32 *) header; |
| 88 | dst = (u32 *) nvram_buf; |
| 89 | for (i = 0; i < sizeof(struct nvram_header); i += 4) |
| 90 | *dst++ = *src++; |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 91 | for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4) |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 92 | *dst++ = le32_to_cpu(*src++); |
Hauke Mehrtens | f36738d | 2012-12-26 19:51:13 +0000 | [diff] [blame] | 93 | memset(dst, 0x0, NVRAM_SPACE - i); |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 94 | |
| 95 | return 0; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 96 | } |
| 97 | |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 98 | #ifdef CONFIG_BCM47XX_SSB |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 99 | static int nvram_init_ssb(void) |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 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"); |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 110 | return -ENXIO; |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 111 | } |
| 112 | |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 113 | return nvram_find_and_copy(base, lim); |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 114 | } |
| 115 | #endif |
| 116 | |
| 117 | #ifdef CONFIG_BCM47XX_BCMA |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 118 | static int nvram_init_bcma(void) |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 119 | { |
| 120 | struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc; |
| 121 | u32 base; |
| 122 | u32 lim; |
| 123 | |
Hauke Mehrtens | c4485671 | 2012-12-26 19:51:11 +0000 | [diff] [blame] | 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 |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 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"); |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 140 | return -ENXIO; |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 141 | } |
| 142 | |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 143 | return nvram_find_and_copy(base, lim); |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 144 | } |
| 145 | #endif |
| 146 | |
Hauke Mehrtens | e58da16 | 2012-12-26 19:51:12 +0000 | [diff] [blame] | 147 | static int nvram_init(void) |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 148 | { |
| 149 | switch (bcm47xx_bus_type) { |
| 150 | #ifdef CONFIG_BCM47XX_SSB |
| 151 | case BCM47XX_BUS_TYPE_SSB: |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 152 | return nvram_init_ssb(); |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 153 | #endif |
| 154 | #ifdef CONFIG_BCM47XX_BCMA |
| 155 | case BCM47XX_BUS_TYPE_BCMA: |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 156 | return nvram_init_bcma(); |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 157 | #endif |
| 158 | } |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 159 | return -ENXIO; |
Rafał Miłecki | bb76563 | 2012-12-26 08:29:17 +0000 | [diff] [blame] | 160 | } |
| 161 | |
Hauke Mehrtens | 111bd98 | 2012-12-26 19:51:14 +0000 | [diff] [blame] | 162 | int bcm47xx_nvram_getenv(char *name, char *val, size_t val_len) |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 163 | { |
| 164 | char *var, *value, *end, *eq; |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 165 | int err; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 166 | |
| 167 | if (!name) |
Hauke Mehrtens | ee7e2f3 | 2012-12-26 19:51:09 +0000 | [diff] [blame] | 168 | return -EINVAL; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 169 | |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 170 | if (!nvram_buf[0]) { |
Hauke Mehrtens | e58da16 | 2012-12-26 19:51:12 +0000 | [diff] [blame] | 171 | err = nvram_init(); |
Hauke Mehrtens | cc4403e | 2012-12-26 19:51:10 +0000 | [diff] [blame] | 172 | if (err) |
| 173 | return err; |
| 174 | } |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 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) { |
Hauke Mehrtens | 44d4b2a | 2012-02-28 00:56:11 +0100 | [diff] [blame] | 187 | return snprintf(val, val_len, "%s", value); |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 188 | } |
| 189 | } |
Hauke Mehrtens | ee7e2f3 | 2012-12-26 19:51:09 +0000 | [diff] [blame] | 190 | return -ENOENT; |
Waldemar Brodkorb | 121915c | 2010-06-08 19:06:01 +0200 | [diff] [blame] | 191 | } |
Hauke Mehrtens | 111bd98 | 2012-12-26 19:51:14 +0000 | [diff] [blame] | 192 | EXPORT_SYMBOL(bcm47xx_nvram_getenv); |