• Arnd Bergmann's avatar
    ARM: s3c24xx: simplify mach/io.h · 98c2922e
    Arnd Bergmann authored
    s3c24xx has a custom implementation of the inb/outb family of I/O
    accessors, implementing both general register access and ISA I/O port
    through a multiplexer.
    
    As far as I can tell, the first case has never been needed, and certainly
    is not used now, as drivers only use inb/outb to actually driver ISA or
    PCI port I/O.
    
    Similarly, the special ISA support is limited to a single machine, the
    Simtec Electronics BAST (EB2410ITX) with its PC/104 expansion connector,
    all other machines could simply use the generic implementation from
    asm/io.h that expects a single memory-mapped address range for byte,
    word and dword access. As no other machines besides BAST actually selects
    CONFIG_ISA, this is likely not even necessary.
    
    As a cleanup, remove support for the non-ISA access from the helpers,
    and make the ISA access use the virtual address window that we use
    elsewhere for PCI I/O ports. In configurations without the BAST machine,
    this now falls back on the generic implementation from asm/io.h, but
    the mach/io.h header is still relied on to include a number of other
    header files implicitly.
    Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    Link: https://lore.kernel.org/r/20200806182059.2431-7-krzk@kernel.orgSigned-off-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
    98c2922e
map-s3c.h 1.81 KB