imx:mx6sxsabresd support qspi AHB read
Add CONFIG_SYS_FSL_QSPI_AHB in header file to enable AHB in driver. In order to count the time, add CONFIG_CMD_TIME. Using AHB read can improve the the read speed about 30%. AHB read: => time sf read 0x8f800000 0 100000 SF: 1048576 bytes @ 0x0 Read: OK time: 0.174 seconds => time sf read 0x8f800000 1000000 100000 SF: 1048576 bytes @ 0x1000000 Read: OK time: 0.174 seconds IP read: => time sf read 0x8f800000 0 100000 SF: 1048576 bytes @ 0x0 Read: OK time: 0.227 seconds => time sf read 0x8f800000 1000000 100000 SF: 1048576 bytes @ 0x1000000 Read: OK time: 0.227 seconds Note: Quad read is not supported in driver, now. In my side, using AHB and Quad read can achieve about 16MB/s. Anyway, I have plan to reimplement the driver using DTB and DM, then make the code cleaner and more feature can be added. Signed-off-by: NPeng Fan <Peng.Fan@freescale.com> Reviewed-by: NJagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
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