target/linux/ar71xx/patches-3.6/a06-rb750_nand-add-buffer-verification.patch

   1 --- a/drivers/mtd/nand/rb750_nand.c
   2 +++ b/drivers/mtd/nand/rb750_nand.c
   3 @@ -110,7 +110,8 @@ static void rb750_nand_write(const u8 *b
   4         __raw_readl(base + AR71XX_GPIO_REG_OE);
   5  }
   6
   7 -static void rb750_nand_read(u8 *read_buf, unsigned len)
   8 +static int rb750_nand_read_verify(u8 *read_buf, unsigned len,
   9 +                                 const u8 *verify_buf)
  10  {
  11         void __iomem *base = ath79_gpio_base;
  12         unsigned i;
  13 @@ -130,8 +131,13 @@ static void rb750_nand_read(u8 *read_buf
  14                 /* deactivate RE line */
  15                 __raw_writel(RB750_NAND_NRE, base + AR71XX_GPIO_REG_SET);
  16
  17 -               read_buf[i] = data;
  18 +               if (read_buf)
  19 +                       read_buf[i] = data;
  20 +               else if (verify_buf && verify_buf[i] != data)
  21 +                       return -EFAULT;
  22         }
  23 +
  24 +       return 0;
  25  }
  26
  27  static void rb750_nand_select_chip(struct mtd_info *mtd, int chip)
  28 @@ -206,13 +212,13 @@ static void rb750_nand_cmd_ctrl(struct m
  29  static u8 rb750_nand_read_byte(struct mtd_info *mtd)
  30  {
  31         u8 data = 0;
  32 -       rb750_nand_read(&data, 1);
  33 +       rb750_nand_read_verify(&data, 1, NULL);
  34         return data;
  35  }
  36
  37  static void rb750_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len)
  38  {
  39 -       rb750_nand_read(buf, len);
  40 +       rb750_nand_read_verify(buf, len, NULL);
  41  }
  42
  43  static void rb750_nand_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
  44 @@ -220,6 +226,11 @@ static void rb750_nand_write_buf(struct
  45         rb750_nand_write(buf, len);
  46  }
  47
  48 +static int rb750_nand_verify_buf(struct mtd_info *mtd, const u8 *buf, int len)
  49 +{
  50 +       return rb750_nand_read_verify(NULL, len, buf);
  51 +}
  52 +
  53  static void __init rb750_nand_gpio_init(struct rb750_nand_info *info)
  54  {
  55         void __iomem *base = ath79_gpio_base;
  56 @@ -274,6 +285,7 @@ static int __devinit rb750_nand_probe(st
  57         info->chip.read_byte    = rb750_nand_read_byte;
  58         info->chip.write_buf    = rb750_nand_write_buf;
  59         info->chip.read_buf     = rb750_nand_read_buf;
  60 +       info->chip.verify_buf   = rb750_nand_verify_buf;
  61
  62         info->chip.chip_delay   = 25;
  63         info->chip.ecc.mode     = NAND_ECC_SOFT;