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    • sibradzic's avatar
      flashchips: port S25FS(128S) chip from chromiumos · a3519561
      sibradzic authored
      This may seem too big just to support yet another flash chip, but in
      reality it brings support for whole new family of S25FS
      Spansion/Cypress flash chips. These chips require handling of some
      special status registers for erasing or writing, with very specific
      timing checks in place.
      
      For example, WIP status bit will remain being set to 1 if erase or
      programming errors occur, and in that case chip 'software reset' has
      to be performed otherwise the chip will remain unresponsive to all
      further commands. Also, special CR3NV register (Configuration Register
      3 Nonvolatile) status bits needs to be read and set by using RDAR
      (ReaD Any Register) and WRAR (WRite Any Register) OP commands, and
      these states are needed to determine which type of reset feature is
      enabled at the time (legacy or S25FS type) in the first place,
      determine whether Uniform or Hybrid sector architecture is used
      at the time, or set programming buffer address wrap point (256 or 512
      bytes). Furthermore, S25FS chip status register has to be restored to
      its original state (hence that ugly CHIP_RESTORE_CALLBACK) following
      erasing or writing, failing to do so may result in host being unable
      to access data on the chip at all.
      
      Finally, although this brings support for the whole family of chips,
      I only have one such chip to do the actual testing, S25FS128S (Small
      Sectors), which I had fully tested on ch341a and FT4232H programmers,
      with confirmed working probe, read, erase and write.
      
      Full summary of changes are here:
      
      flashchips:
        add new flashchip sctructure property:
          .reset
        add chip definitions:
          S25FS128S Large Sectors
          S25FS128S Small Sectors
      
      flash:
        add macro (chip_restore_func_data call-back):
          CHIP_RESTORE_CALLBACK
      
      flashrom:
        add struct:
          chip_restore_func_data
        add call-back function:
          register_chip_restore
      
      spi:
        add OP codes:
          CMD_RDAR, CMD_WRAR, CMD_WRAR_LEN, CMD_RSTEN, CMD_RST
        add register bit function definitions:
          CR3NV_ADDR, CR3NV_20H_NV
        add timers:
          T_W, T_RPH, T_SE
      
      spi25:
        refactor (based on chromiumos implementation) function:
          spi_poll_wip
        port these functions from chromiumos:
          probe_spi_big_spansion
          s25fs_software_reset
          s25f_legacy_software_reset
          s25fs_block_erase_d8
      
      spi25_statusreg:
        port these functions from chromiumos:
          spi_restore_status
          s25fs_read_cr
          s25fs_write_cr
          s25fs_restore_cr3nv
      
      Most of the ported functions are originally from s25f.c found at
      https://chromium.googlesource.com/chromiumos/third_party/flashrom
      
      
      with exception of spi_restore_status which is defined in
      spi25_statusreg.c. The rest of macros and OP codes are defined in
      same files as in this commit.
      
      Change-Id: If659290874a4b9db6e71256bdef382d31b288e72
      Signed-off-by: default avatarSamir Ibradzic <sibradzic@gmail.com>
      Reviewed-on: https://review.coreboot.org/c/flashrom/+/39822
      
      
      Tested-by: default avatarbuild bot (Jenkins) <no-reply@coreboot.org>
      Reviewed-by: default avatarEdward O'Callaghan <quasisec@chromium.org>
      a3519561
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