target/linux/brcm47xx/patches-3.2/029-bcm47xx-read-nvram-from-sflash.patch

   1 From 1d693b2c9d5943cbe938f879041b837cd004737f Mon Sep 17 00:00:00 2001
   2 From: Hauke Mehrtens <hauke@hauke-m.de>
   3 Date: Sat, 23 Jul 2011 18:29:38 +0200
   4 Subject: [PATCH 25/26] bcm47xx: read nvram from sflash
   5
   6 bcm47xx: add sflash support to nvram
   7
   8 Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
   9 ---
  10  arch/mips/bcm47xx/nvram.c |   86 +++++++++++++++++++++++++++++++++++++++++++-
  11  1 files changed, 84 insertions(+), 2 deletions(-)
  12
  13 --- a/arch/mips/bcm47xx/nvram.c
  14 +++ b/arch/mips/bcm47xx/nvram.c
  15 @@ -20,11 +20,12 @@
  16  #include <asm/addrspace.h>
  17  #include <asm/mach-bcm47xx/nvram.h>
  18  #include <asm/mach-bcm47xx/bcm47xx.h>
  19 +#include <asm/mach-bcm47xx/bus.h>
  20
  21  static char nvram_buf[NVRAM_SPACE];
  22
  23  /* Probe for NVRAM header */
  24 -static void early_nvram_init(void)
  25 +static void early_nvram_init_pflash(void)
  26  {
  27  #ifdef CONFIG_BCM47XX_SSB
  28         struct ssb_chipcommon *ssb_cc;
  29 @@ -86,7 +87,88 @@ found:
  30         for (i = 0; i < sizeof(struct nvram_header); i += 4)
  31                 *dst++ = *src++;
  32         for (; i < header->len && i < NVRAM_SPACE; i += 4)
  33 -               *dst++ = le32_to_cpu(*src++);
  34 +               *dst++ = *src++;
  35 +}
  36 +
  37 +static int early_nvram_init_sflash(void)
  38 +{
  39 +       struct nvram_header header;
  40 +       u32 off;
  41 +       int ret;
  42 +       char *dst;
  43 +       int len;
  44 +
  45 +       /* check if the struct is already initilized */
  46 +       if (!bcm47xx_sflash.size)
  47 +               return -1;
  48 +
  49 +       off = FLASH_MIN;
  50 +       while (off <= bcm47xx_sflash.size) {
  51 +               ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - NVRAM_SPACE, sizeof(header), (u8 *)&header);
  52 +               if (ret != sizeof(header))
  53 +                       return ret;
  54 +               if (header.magic == NVRAM_HEADER)
  55 +                       goto found;
  56 +               off <<= 1;
  57 +       }
  58 +
  59 +       off = FLASH_MIN;
  60 +       while (off <= bcm47xx_sflash.size) {
  61 +               ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - (2 * NVRAM_SPACE), sizeof(header), (u8 *)&header);
  62 +               if (ret != sizeof(header))
  63 +                       return ret;
  64 +               if (header.magic == NVRAM_HEADER)
  65 +                       goto found;
  66 +               off <<= 1;
  67 +       }
  68 +       return -1;
  69 +
  70 +found:
  71 +       len = NVRAM_SPACE;
  72 +       dst = nvram_buf;
  73 +       while (len) {
  74 +               ret = bcm47xx_sflash.read(&bcm47xx_sflash, off - (2 * NVRAM_SPACE), len, dst);
  75 +               if (ret < 0)
  76 +                       return ret;
  77 +               off += ret;
  78 +               len -= ret;
  79 +               dst += ret;
  80 +       }
  81 +       return 0;
  82 +}
  83 +
  84 +static void early_nvram_init(void)
  85 +{
  86 +       int err = 0;
  87 +
  88 +       switch (bcm47xx_bus_type) {
  89 +#ifdef CONFIG_BCM47XX_SSB
  90 +       case BCM47XX_BUS_TYPE_SSB:
  91 +               if (bcm47xx_bus.ssb.chipco.flash_type == SSB_PFLASH) {
  92 +                       early_nvram_init_pflash();
  93 +               } else if (bcm47xx_bus.ssb.chipco.flash_type == SSB_SFLASH) {
  94 +                       err = early_nvram_init_sflash();
  95 +                       if (err < 0)
  96 +                               printk(KERN_WARNING "can not read from flash: %i\n", err);
  97 +               } else {
  98 +                       printk(KERN_WARNING "unknow flash type\n");
  99 +               }
 100 +               break;
 101 +#endif
 102 +#ifdef CONFIG_BCM47XX_BCMA
 103 +       case BCM47XX_BUS_TYPE_BCMA:
 104 +               if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_PFLASH) {
 105 +                       early_nvram_init_pflash();
 106 +               } else if (bcm47xx_bus.bcma.bus.drv_cc.flash_type == BCMA_SFLASH) {
 107 +                       err = early_nvram_init_sflash();
 108 +                       if (err < 0)
 109 +                               printk(KERN_WARNING "can not read from flash: %i\n", err);
 110 +               } else {
 111 +                       printk(KERN_WARNING "unknow flash type\n");
 112 +               }
 113 +               break;
 114 +#endif
 115 +       }
 116  }
 117
 118  int nvram_getenv(char *name, char *val, size_t val_len)