package/boot/uboot-lantiq/patches/0011-sf-spansion-add-support-for-4-byte-address-mode.patch

   1 From 0add8e5c60961d2b99174610df8d3d9d6d192b74 Mon Sep 17 00:00:00 2001
   2 From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
   3 Date: Wed, 7 Nov 2012 14:16:11 +0100
   4 Subject: sf: spansion: add support for 4-byte address mode
   5
   6 Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
   7
   8 --- a/drivers/mtd/spi/spansion.c
   9 +++ b/drivers/mtd/spi/spansion.c
  10 @@ -31,6 +31,10 @@
  11
  12  #include "spi_flash_internal.h"
  13
  14 +#define S25FLXX_BRRD           0x16            /* Read Bank Register */
  15 +#define S25FLXX_BRWR           0x17            /* Write Bank Register */
  16 +#define S25FLXX_BAR_EXTADD     (1 << 7)        /* Extended address enable */
  17 +
  18  struct spansion_spi_flash_params {
  19         u16 idcode1;
  20         u16 idcode2;
  21 @@ -112,6 +116,23 @@ static const struct spansion_spi_flash_p
  22         },
  23  };
  24
  25 +static __maybe_unused int spansion_set_4byte_mode(struct spi_flash *flash)
  26 +{
  27 +       struct spi_slave *spi = flash->spi;
  28 +       u8 bar, cmd;
  29 +       int err;
  30 +
  31 +       cmd = S25FLXX_BRRD;
  32 +       err = spi_flash_cmd(spi, cmd, &bar, 1);
  33 +       if (err)
  34 +               return err;
  35 +
  36 +       bar |= S25FLXX_BAR_EXTADD;
  37 +       cmd = S25FLXX_BRWR;
  38 +
  39 +       return spi_flash_cmd_write(spi, &cmd, 1, &bar, 1);
  40 +}
  41 +
  42  int spi_flash_probe_spansion(struct spi_flash *flash, u8 *idcode)
  43  {
  44         const struct spansion_spi_flash_params *params;
  45 @@ -144,5 +165,10 @@ int spi_flash_probe_spansion(struct spi_
  46         flash->sector_size = 256 * params->pages_per_sector;
  47         flash->size = flash->sector_size * params->nr_sectors;
  48
  49 +#ifdef CONFIG_SPI_FLASH_4BYTE_MODE
  50 +       if (flash->size > (1 << 24))
  51 +               flash->set_4byte_mode = spansion_set_4byte_mode;
  52 +#endif
  53 +
  54         return 1;
  55  }