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Unable to read write to CPLD in kernel space : T1040RDB

Question asked by Parag Rao on Jun 23, 2016

Below is the u-boot log :

U-Boot 2014.07QorIQ-SDK-V1.7+g659b6a2 (Dec 13 2014 - 18:00:52)

CPU0:  T1040E, Version: 1.1, (0x85280011)
Core:  e5500, Version: 2.1, (0x80241021)
Clock Configuration:
       CPU0:1400 MHz, CPU1:1400 MHz, CPU2:1400 MHz, CPU3:1400 MHz,
       CCB:600  MHz,
       DDR:800  MHz (1600 MT/s data rate) (Asynchronous), IFC:150  MHz
       QE:300  MHz
       FMAN1: 600 MHz
       QMAN:  300 MHz
       PME:   300 MHz
L1:    D-cache 32 KiB enabled
       I-cache 32 KiB enabled
Reset Configuration Word (RCW):
       00000000: 0c18000e 0e000000 00000000 00000000
       00000010: 66000002 80000002 ec027000 01000000
       00000020: 00000000 00000000 00000000 00032810
       00000030: 00000000 0342500f 00000000 00000000
Board: T1040RDB
Board rev: 0x01 CPLD ver: 0x09, vBank: 0


Here i can see the u-boot code is able to read the cpld version register.

I want to do the same thing from kernel space.

i added some code to in fsl_ifc.c : attached herewith.

i believe there is something with memory mapping the external device. need few pointers to start with.

I have attached a log.txt file herewith :

which details out the register values of IFC,u-boot log and kernel log.

Please do provide suggestion and valuable comments to proceed further.

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