Thank you Srinivas, that was in my mind. I will do that and let you guys know.
Regards, Sri. On Fri, Dec 27, 2013 at 7:34 PM, srinivas bakki <[email protected]>wrote: > Suggest you to eliminate the problem on the FPGA first. Hook on a scope > onto the address lines of the FPGA and check whether you get the required > addresses when you access it. I think there's no reason to doubt ioremap. > > > On Fri, Dec 27, 2013 at 12:22 PM, haresh langaraman <[email protected]>wrote: > >> Is there any way to specify in power pc that we can make static physical >> to virtual mapping which is similar to io_table_init in ARM? >> >> choose the virtual address and map to FPGA physical address using mapping >> function similar to io_table_init? I am hoping that it has to be there >> because your platform driver requires to access the board's registers using >> it. >> >> have you tried using io_remap alone instead of io_remap_nocahe? >> >> or just to try >> >> write a user space application with mmap to this address and try to see >> whether you are able to read scratch regs? >> >> >> >> On Fri, Dec 27, 2013 at 12:11 PM, Sri Ram Vemulpali < >> [email protected]> wrote: >> >>> Haresh, >>> >>> iotable_init() is specific to ARM arch. I am using powerpc, seems there >>> is no equivalent to that static function. Can you please give more input. >>> >>> Thanks, >>> Sri. >>> >>> >>> On Thu, Dec 26, 2013 at 9:01 PM, Sri Ram Vemulpali < >>> [email protected]> wrote: >>> >>>> 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. >>>> >>> >>> >>> >>> -- >>> Regards, >>> Sri. >>> >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> [email protected] >> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> >> > -- Regards, Sri.
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