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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: Peng Fan <Peng.Fan@freescale.com>
Reviewed-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
This commit is contained in:
Peng Fan 2015-01-08 10:40:21 +08:00 committed by Jagannadha Sutradharudu Teki
parent 5f7f70c171
commit adc0fabfd9
1 changed files with 3 additions and 0 deletions
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3
include/configs/mx6sxsabresd.h
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@ -235,6 +235,8 @@
/* FLASH and environment organization */ /* FLASH and environment organization */
#define CONFIG_SYS_NO_FLASH #define CONFIG_SYS_NO_FLASH
#define CONFIG_CMD_TIME
#define CONFIG_FSL_QSPI #define CONFIG_FSL_QSPI
#ifdef CONFIG_FSL_QSPI #ifdef CONFIG_FSL_QSPI
@ -244,6 +246,7 @@
#define CONFIG_SPI_FLASH_SPANSION #define CONFIG_SPI_FLASH_SPANSION
#define CONFIG_SPI_FLASH_STMICRO #define CONFIG_SPI_FLASH_STMICRO
#define CONFIG_SYS_FSL_QSPI_LE #define CONFIG_SYS_FSL_QSPI_LE
#define CONFIG_SYS_FSL_QSPI_AHB
#ifdef CONFIG_MX6SX_SABRESD_REVA #ifdef CONFIG_MX6SX_SABRESD_REVA
#define FSL_QSPI_FLASH_SIZE SZ_16M #define FSL_QSPI_FLASH_SIZE SZ_16M
#else #else