• Geert Uytterhoeven's avatar
    ARM: shmobile: Consolidate SCU mapping code · 8701d808
    Geert Uytterhoeven authored
    Currently the SCU registers are mapped in SoC-specific code, using
    different methods, all involving the static mapping set up from
    machine_desc.map_io():
      - On emev2, a static (non-identity) mapping is used, with ioremap().
        As the static mapping uses the MT_DEVICE type, ioremap() reuses it,
        and the returned virtual address is suitable for passing to
        shmobile_smp_hook(),
      - On sh73a0 and r8a7779, a static identity mapping is used, with the
        legacy IOMEM() macro.
        As the static mapping uses the MT_DEVICE_NONSHARED type, replacing
        IOMEM() by ioremap() would create a new mapping, whose virtual
        address cannot be passed to shmobile_smp_hook().
    
    Move the mapping of the SCU registers from SoC-specific code to common
    code, always using ioremap(). To work in the absence of a static
    mapping, this requires passing the physical SCU base address to
    shmobile_smp_hook().
    Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
    Signed-off-by: default avatarSimon Horman <horms+renesas@verge.net.au>
    8701d808
smp-r8a7779.c 2.99 KB