Thanks for reply Haresh. Will try and let u know. Thanks, Sri
On Thu, Dec 26, 2013 at 5:09 PM, haresh langaraman <[email protected]>wrote: > Hi ram, > > Can you try to map the address using io_table_init table of kernel > initialization code. > > Thanks, > Haresh. > On 27 Dec 2013 05:12, "Sri Ram Vemulpali" <[email protected]> wrote: > >> Hi All, >> >> I am using custom board MPC8641d. It has all evaluation board devices >> connected. Apart from that an external FPGA device connected through >> localbus. >> >> The localbus is at address 0xF5005000 directly connected to processor. >> The FPGA address in the processor realm is 0xF3800000. As per spec FPGA >> target interface is CS3 (chip select 3). 32-bit peripheral address bus as >> seen by FPGA is 0xF3800000. The global address of FPGA is 0x0BFC0000. >> >> >> I am implementing driver for FPGA. I am using ioremap() to map to FPGA >> registers at location 0xF3800000. The virtual address returned by ioremap() >> when used with write32(), read32() at memory locations shows no response >> from device. FPGA has special scratch pad to which one can write and read >> to validate the memory map is working. When I write and read I see no value. >> >> #define FCP_ADDRESS_START 0xF3800000 >> #define FCP_ADDRESS_END 0xF3808000 >> #define FCP_ADDRESS_RANGE (FCP_ADDRESS_END - FCP_ADDRESS_START) >> >> void *fcp_scratch_pad; >> char buff[10]; >> >> io_fcp_mem = ioremap_nocache( FCP_ADDRESS_START, FCP_ADDRESS_RANGE ); >> >> if( ! io_fcp_mem ) { >> return -ENODEV; >> } >> >> printk( KERN_CRIT "ioremap virt mem:%p\n", io_fcp_mem ); >> >> fcp_scratch_pad = ((char*)io_fcp_mem) + 224; >> >> printk( KERN_CRIT "scratch pad virt mem:%p\n", fcp_scratch_pad ); >> >> iowrite8_rep( fcp_scratch_pad, "Hello", 6 ); >> >> ioread8_rep( fcp_scratch_pad, buff, 6 ); >> >> printk( KERN_CRIT "value read from scratch_pad:%s\n", buff ); >> >> return 0; >> >> >> Attached is the device tree of the board. >> >> Can anyone please direct me or point where I am doing wrong. It seems I >> am unable to access FPGA device memory. Thanks. >> >> -- >> Regards, >> Sri. >> >> _______________________________________________ >> Kernelnewbies mailing list >> [email protected] >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> -- Regards, Sri.
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