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  4. 12 Dec, 2013 1 commit
    • Baruch Siach's avatar
      gpio: driver for Xtensa GPIO32 · 3b31d0ec
      Baruch Siach authored
      GPIO32 is a standard optional extension to the Xtensa architecture
      core that provides preconfigured output and input ports for intra
      SoC signaling. The GPIO32 option is implemented as 32bit Tensilica
      Instruction Extension (TIE) output state called EXPSTATE, and 32bit
      input wire called IMPWIRE. This driver treats input and output
      states as two distinct devices.
      * Use BUG() in xtensa_impwire_set_value() to indicate that
        it should never be called (Linus Walleij)
      * Address the comments of Linus Walleij:
        - Add a few comments
        - Expand commit log message
        - Use the BIT() macro for bit offsets
        - Rewrite CPENABLE handling as static inlines
        - Use device_initcall()
      * Depend on !SMP for reason explained in the comments (Marc Gauthier)
      * Use XCHAL_CP_ID_XTIOP to enable/disable GPIO32 only
      Signed-off-by: default avatarBaruch Siach <baruch@tkos.co.il>
      Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>