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authoraaron.williams@caviumnetworks.com <aaron.williams@caviumnetworks.com>2013-03-03 16:45:05 +0530
committerStefan Roese <sr@denx.de>2013-04-02 14:27:45 +0200
commit239cb9d904cfa8ab50d840a47b3306189d695c75 (patch)
tree829d628038a63e13271717a3b7c6ad0144f01b8f /drivers/hwmon
parent5644369450635fa5c2967bee55b1ac41f6e988d0 (diff)
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mtd: cfi_flash: Fix CFI flash driver for 8-bit bus support
This commit is based on that patch from aaron.williams@caviumnetworks.com with same commit title. pulled the same code changes into current u-boot tree. http://patchwork.ozlabs.org/patch/140863/ http://lists.denx.de/pipermail/u-boot/2011-April/089606.html This patch corrects the addresses used when working with Spansion/AMD FLASH chips. Addressing for 8 and 16 bits is almost identical except in the 16-bit case the LSB of the address is always 0. The confusion arose because the addresses in the datasheet for 16-bit mode are word addresses but this code assumed it was byte addresses. I have only been able to test this on our Octeon boards which use either an 8-bit or 16-bit bus. I have not tested the case where there's an 8-bit part on a 16-bit bus. This patch also adds some delays as suggested by Spansion. If a part can be both 8 and 16-bits, it forces it to work in 8-bit mode if an 8-bit bus is detected. Apart from the pulled changes, fixed few minor code cleanups and tested on 256M29EW, 512M29EW flashes. Before this fix: --------------- Bank # 1: CFI conformant flash (8 x 8) Size: 64 MB in 512 Sectors AMD Standard command set, Manufacturer ID: 0xFF, Device ID: 0xFF Erase timeout: 4096 ms, write timeout: 2 ms Buffer write timeout: 5 ms, buffer size: 1024 bytes After this fix: -------------- Bank # 1: CFI conformant flash (8 x 8) Size: 64 MB in 512 Sectors AMD Standard command set, Manufacturer ID: 0x89, Device ID: 0x7E2301 Erase timeout: 4096 ms, write timeout: 2 ms Buffer write timeout: 5 ms, buffer size: 1024 bytes Signed-off-by: Aaron Williams <aaron.williams@caviumnetworks.com> Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com> Tested-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Diffstat (limited to 'drivers/hwmon')
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