• Wu Zhangjin's avatar
    MIPS: Loongson: Add basic Loongson 2F support · 6f7a251a
    Wu Zhangjin authored
    Loongson 2F has built-in DDR2 and PCI-X controller. The PCI-X controller
    has a programming interface similiar to the the FPGA northbridge used on
    Loongson 2E.
    The main differences between Loongson 2E and Loongson 2F include:
    1. Loongson 2F has an extra address window configuration module, which
       is used to map CPU address space to DDR or PCI address space, or map
       the PCI-DMA address space to DDR or LIO address space.
    2. Loongson 2F supports 8 levels of software configurable CPu frequency
       which can be configured in the LOONGSON_CHIPCFG0 register.  The coming
       cpufreq and standby support are based on this feature.
    Loongson.h abstracts the modules and corresponding methods are abstracted.
    Add other Loongson-2F-specific source code including gcc 4.4 support, PCI
    memory space, PCI IO space, DMA address.
    Signed-off-by: default avatarWu Zhangjin <wuzhangjin@gmail.com>
    Cc: linux-mips@linux-mips.org
    Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
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