target/linux/brcm47xx/patches-3.6/080-MIPS-BCM47XX-rewrite-nvram-probing.patch

   1 --- a/arch/mips/bcm47xx/nvram.c
   2 +++ b/arch/mips/bcm47xx/nvram.c
   3 @@ -3,7 +3,7 @@
   4   *
   5   * Copyright (C) 2005 Broadcom Corporation
   6   * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
   7 - * Copyright (C) 2010-2011 Hauke Mehrtens <hauke@hauke-m.de>
   8 + * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
   9   *
  10   * This program is free software; you can redistribute  it and/or modify it
  11   * under  the terms of  the GNU General  Public License as published by the
  12 @@ -23,69 +23,139 @@
  13
  14  static char nvram_buf[NVRAM_SPACE];
  15
  16 +static u32 find_nvram_size(u32 end)
  17 +{
  18 +       struct nvram_header *header;
  19 +       u32 nvram_sizes[] = {0x8000, 0xF000, 0x10000};
  20 +       int i;
  21 +
  22 +       for (i = 0; i < ARRAY_SIZE(nvram_sizes); i++) {
  23 +               header = (struct nvram_header *)KSEG1ADDR(end - nvram_sizes[i]);
  24 +               if (header->magic == NVRAM_HEADER)
  25 +                       return nvram_sizes[i];
  26 +       }
  27 +
  28 +       return 0;
  29 +}
  30 +
  31  /* Probe for NVRAM header */
  32 -static void early_nvram_init(void)
  33 +static void early_nvram_init_fill(u32 base, u32 lim)
  34  {
  35 -#ifdef CONFIG_BCM47XX_SSB
  36 -       struct ssb_mipscore *mcore_ssb;
  37 -#endif
  38 -#ifdef CONFIG_BCM47XX_BCMA
  39 -       struct bcma_drv_cc *bcma_cc;
  40 -#endif
  41         struct nvram_header *header;
  42         int i;
  43 -       u32 base = 0;
  44 -       u32 lim = 0;
  45         u32 off;
  46         u32 *src, *dst;
  47 +       u32 size;
  48
  49 -       switch (bcm47xx_bus_type) {
  50 -#ifdef CONFIG_BCM47XX_SSB
  51 -       case BCM47XX_BUS_TYPE_SSB:
  52 -               mcore_ssb = &bcm47xx_bus.ssb.mipscore;
  53 -               base = mcore_ssb->pflash.window;
  54 -               lim = mcore_ssb->pflash.window_size;
  55 -               break;
  56 -#endif
  57 -#ifdef CONFIG_BCM47XX_BCMA
  58 -       case BCM47XX_BUS_TYPE_BCMA:
  59 -               bcma_cc = &bcm47xx_bus.bcma.bus.drv_cc;
  60 -               base = bcma_cc->pflash.window;
  61 -               lim = bcma_cc->pflash.window_size;
  62 -               break;
  63 -#endif
  64 -       }
  65 -
  66 +       /* TODO: when nvram is on nand flash check for bad blocks first. */
  67         off = FLASH_MIN;
  68         while (off <= lim) {
  69                 /* Windowed flash access */
  70 -               header = (struct nvram_header *)
  71 -                       KSEG1ADDR(base + off - NVRAM_SPACE);
  72 -               if (header->magic == NVRAM_HEADER)
  73 +               size = find_nvram_size(base + off);
  74 +               if (size) {
  75 +                       header = (struct nvram_header *)KSEG1ADDR(base + off -
  76 +                                                                 size);
  77                         goto found;
  78 +               }
  79                 off <<= 1;
  80         }
  81
  82         /* Try embedded NVRAM at 4 KB and 1 KB as last resorts */
  83         header = (struct nvram_header *) KSEG1ADDR(base + 4096);
  84 -       if (header->magic == NVRAM_HEADER)
  85 +       if (header->magic == NVRAM_HEADER) {
  86 +               size = NVRAM_SPACE;
  87                 goto found;
  88 +       }
  89
  90         header = (struct nvram_header *) KSEG1ADDR(base + 1024);
  91 -       if (header->magic == NVRAM_HEADER)
  92 +       if (header->magic == NVRAM_HEADER) {
  93 +               size = NVRAM_SPACE;
  94                 goto found;
  95 +       }
  96
  97 +       pr_err("no nvram found\n");
  98         return;
  99
 100  found:
 101 +
 102 +       if (header->len > size)
 103 +               pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
 104 +       if (header->len > NVRAM_SPACE)
 105 +               pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
 106 +                      header->len, NVRAM_SPACE);
 107 +
 108         src = (u32 *) header;
 109         dst = (u32 *) nvram_buf;
 110         for (i = 0; i < sizeof(struct nvram_header); i += 4)
 111                 *dst++ = *src++;
 112 -       for (; i < header->len && i < NVRAM_SPACE; i += 4)
 113 +       for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
 114                 *dst++ = le32_to_cpu(*src++);
 115  }
 116
 117 +#ifdef CONFIG_BCM47XX_BCMA
 118 +static void early_nvram_init_bcma(void)
 119 +{
 120 +       struct bcma_drv_cc *cc = &bcm47xx_bus.bcma.bus.drv_cc;
 121 +       u32 base = 0;
 122 +       u32 lim = 0;
 123 +
 124 +       if (cc->nflash.boot) {
 125 +               base = BCMA_SOC_FLASH1;
 126 +               lim = BCMA_SOC_FLASH1_SZ;
 127 +       } else if (cc->pflash.present) {
 128 +               base = cc->pflash.window;
 129 +               lim = cc->pflash.window_size;
 130 +       } else if (cc->sflash.present) {
 131 +               base = cc->sflash.window;
 132 +               lim = cc->sflash.size;
 133 +       } else {
 134 +               pr_err("No supported flash found\n");
 135 +               return;
 136 +       }
 137 +
 138 +       early_nvram_init_fill(base, lim);
 139 +}
 140 +#endif
 141 +
 142 +#ifdef CONFIG_BCM47XX_SSB
 143 +static void early_nvram_init_ssb(void)
 144 +{
 145 +       struct ssb_mipscore *mcore = &bcm47xx_bus.ssb.mipscore;
 146 +       struct ssb_chipcommon *chipco = &bcm47xx_bus.ssb.chipco;
 147 +       u32 base = 0;
 148 +       u32 lim = 0;
 149 +
 150 +       if (mcore->pflash.present) {
 151 +               base = mcore->pflash.window;
 152 +               lim = mcore->pflash.window_size;
 153 +       } else if (chipco->sflash.present) {
 154 +               base = chipco->sflash.window;
 155 +               lim = chipco->sflash.size;
 156 +       } else {
 157 +               pr_err("No supported flash found\n");
 158 +               return;
 159 +       }
 160 +
 161 +       early_nvram_init_fill(base, lim);
 162 +}
 163 +#endif
 164 +
 165 +static void early_nvram_init(void)
 166 +{
 167 +       switch (bcm47xx_bus_type) {
 168 +#ifdef CONFIG_BCM47XX_SSB
 169 +       case BCM47XX_BUS_TYPE_SSB:
 170 +               early_nvram_init_ssb();
 171 +               break;
 172 +#endif
 173 +#ifdef CONFIG_BCM47XX_BCMA
 174 +       case BCM47XX_BUS_TYPE_BCMA:
 175 +               early_nvram_init_bcma();
 176 +               break;
 177 +#endif
 178 +       }
 179 +}
 180 +
 181  int nvram_getenv(char *name, char *val, size_t val_len)
 182  {
 183         char *var, *value, *end, *eq;