[PATCH v12 0/3] add the GPMI controller driver for IMX23/IMX28

[b32955@freescale.com (Huang Shijie)]

Hi,
> Hi,
>
> Huang Shijie writes:
>> The patch set is based on Artem's tree:
>> 	http://git.infradead.org/users/dedekind/l2-mtd-2.6.git
>>
>> The general-purpose media interface(GPMI) controller is a flexible interface
>> to up to several NAND flashs.
>>
>> The Bose Ray-Choudhury Hocquenghem(BCH) module is a hardware ECC accelerator.
>>
>> With the help of BCH, the GPMI controller can choose to do the hardware ECC or
>> not.
>>
>> This driver is a _pure_ MTD NAND controller driver now.
>>
>>
>> The driver depends on another GPMI-NAND device patch set, you can find them at :
>> 	[1] http://marc.info/?l=linux-arm-kernel&m=131416901319573&w=2
>> 	[2] http://marc.info/?l=linux-arm-kernel&m=131416912319668&w=2
>> 	[3] http://marc.info/?l=linux-arm-kernel&m=131416891119504&w=2
>> 	[4] http://marc.info/?l=linux-arm-kernel&m=131416896219539&w=2
>>
>> Test environment:
>> 	Using imx23 and imx28 boards for test.
>>
>> 	imx23 :
>> 	console=ttyAMA0,115200 mtdparts=gpmi-nfc:20m(boot),-(user)
>> 	Tested by USB boot and NAND boot.
>>
>>          imx28 :
>> 	#console=ttyAMA0,115200 root=/dev/mmcblk0p3 rw rootwait
>> 	Tested by SD card boot mode.
>>
> How did you perform your tests?
>
> I tried this driver on our TX28 board with the result that with
> concurrent access of the SD card and the NAND flash, I still get the
> dreaded DMA timeouts within seconds:
> DMA timeout, last DMA :1
> GPMI regs:
>              HW_GPMI_CTRL0[000]=21800001
>            HW_GPMI_COMPARE[010]=00000000
>            HW_GPMI_ECCCTRL[020]=00000000
>           HW_GPMI_ECCCOUNT[030]=00000840
>            HW_GPMI_PAYLOAD[040]=46578000
>          HW_GPMI_AUXILIARY[050]=46578800
>              HW_GPMI_CTRL1[060]=0004000c
>            HW_GPMI_TIMING0[070]=00010203
>            HW_GPMI_TIMING1[080]=05000000
>            HW_GPMI_TIMING2[090]=09020101
>               HW_GPMI_STAT[0b0]=0d000003
>              HW_GPMI_DEBUG[0c0]=01000000
> BCH regs:
>                HW_BCH_CTRL[000]=00000100
>             HW_BCH_STATUS0[010]=00000010
>                HW_BCH_MODE[020]=00000000
>           HW_BCH_ENCODEPTR[030]=00000000
>             HW_BCH_DATAPTR[040]=00000000
>             HW_BCH_METAPTR[050]=00000000
>        HW_BCH_LAYOUTSELECT[070]=00000000
>       HW_BCH_FLASH0LAYOUT0[080]=030a4200
>       HW_BCH_FLASH0LAYOUT1[090]=08404200
>              HW_BCH_DEBUG0[100]=00000000
> DMA regs:
>             HW_APBHX_CTRL0[000]=30000000
>             HW_APBHX_CTRL1[010]=ffff0000
>             HW_APBHX_CTRL2[020]=00000000
>      HW_APBHX_CHANNEL_CTRL[030]=00000000
>      HW_APBHX_CHn_CURCMDAR(0)[100]=46e1c000
>      HW_APBHX_CHn_NXTCMDAR(0)[110]=46e1c04c
>           HW_APBHX_CHn_CMD(0)[120]=000001c8
>           HW_APBHX_CHn_BAR(0)[130]=00000000
>          HW_APBHX_CHn_SEMA(0)[140]=00000000
>        HW_APBHX_CHn_DEBUG1(0)[150]=00a0001e
>        HW_APBHX_CHn_DEBUG2(0)[160]=00000000
>      HW_APBHX_CHn_CURCMDAR(4)[2c0]=4652c098
>      HW_APBHX_CHn_NXTCMDAR(4)[2d0]=4652c0e4
>           HW_APBHX_CHn_CMD(4)[2e0]=000001c9
>           HW_APBHX_CHn_BAR(4)[2f0]=46553241
>          HW_APBHX_CHn_SEMA(4)[300]=00010000
>        HW_APBHX_CHn_DEBUG1(4)[310]=27a00015
>        HW_APBHX_CHn_DEBUG2(4)[320]=00000000
> BCH Geometry :
> GF length              : 13
> ECC Strength           : 8
> Page Size in Bytes     : 2112
> Metadata Size in Bytes : 10
> ECC Chunk Size in Bytes: 512
> ECC Chunk Count        : 4
> Payload Size in Bytes  : 2048
> Auxiliary Size in Bytes: 16
> Auxiliary Status Offset: 12
> Block Mark Byte Offset : 1999
> Block Mark Bit Offset  : 0
>
> I'm doing a:
> dd if=/dev/mtd0>  /dev/null&  dd if=/dev/mmcblk0>  /dev/null
> Sometimes the 'dd' accessing the SD card will stall indefinitely.
> Also copying data from SD card to flash will produce the error, though
> less likely.
>
it reproduces in my side too.
> This looks like the problem arises in the DMA driver when multiple
anyway, I will debug it.

but i will on vacation next week.

I am not sure I can fix it tomorrow.

Best Regards
Huang Shijie
> channels are being used concurrently. The GPMI driver will bail out
> with the timeout error while the MMC driver obviously has no timeout
> check for this situation.
>
> I can mostly rule out HW problems, because the same board works
> perfectly well with WindowsCE (tested with a copy operation between
> flash and SD card).
>
>
> Lothar Wa?mann