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    • Christophe Leroy's avatar
      spi: fsl-spi: use devm_ioremap_resource() to map parameter ram on CPM1 · 575bec53
      Christophe Leroy authored and Mark Brown's avatar Mark Brown committed
      On CPM2, the SPI parameter RAM is dynamically allocated in the
      dualport RAM whereas in CPM1, it is statically allocated to a default
      address with capability to relocate it somewhere else via the use of
      CPM micropatch. The address of the parameter RAM is given by the boot
      loader and expected to be mapped via devm_ioremap_resource()
      In the current implementation, in function fsl_spi_cpm_get_pram()
      there is a confusion between the SPI_BASE register and the base of the
      SPI parameter RAM. Fortunatly, it is working properly with MPC866 and
      MPC885 because they do set SPI_BASE, but on MPC860 and other old
      MPC8xx that doesn't set SPI_BASE, pram_ofs is not properly set.
      Also, the parameter RAM is not properly mapped with
      devm_ioremap_resource() as it should but still gets accessible by
      chance through the full RAM which is mapped from somewhere else.
      This patch applies to the SPI driver the same principle as for the
      CPM UART: when the CPM is of type CPM1, we simply do an
      devm_ioremap_resource() of the area provided via the device tree.
      Signed-off-by: default avatarChristophe Leroy <christophe.leroy@c-s.fr>
      Signed-off-by: Mark Brown's avatarMark Brown <broonie@kernel.org>
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