• Richard Zhu's avatar
    ahci_imx: add ahci sata support on imx platforms · 9e54eae2
    Richard Zhu authored
    imx6q contains one Synopsys AHCI SATA controller, But it can't share
    ahci_platform driver with other controllers because there are some
    misalignments of the generic AHCI controller - the bits definitions of
    the HBA registers, the Vendor Specific registers, the AHCI PHY clock
    and the AHCI signals adjustment window(GPR13 register).
    
     - CAP_SSS(bit20) of the HOST_CAP is writable, default value is '0',
       should be configured to be '1'
    
     - bit0 (only one AHCI SATA port on imx6q) of the HOST_PORTS_IMPL
       should be set to be '1'.(default 0)
    
     - One Vendor Specific register HOST_TIMER1MS(offset:0xe0) should be
       configured regarding to the frequency of AHB bus clock.
    
     - Configurations of the AHCI PHY clock, and the signal parameters of
       the GPR13
    
    Setup its own ahci sata driver, contained the imx6q specific
    initialized codes, re-use the generic ahci_platform driver, and keep
    the generic ahci_platform driver clean as much as possible.
    
    tj: patch description reformatted
    Signed-off-by: default avatarRichard Zhu <r65037@freescale.com>
    Reviewed-by: default avatarShawn Guo <shawn.guo@linaro.org>
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    9e54eae2
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