SD card over (xilinx_)SPI, timeout error while CID
John Linn
John.Linn at xilinx.com
Sat Jun 6 07:15:23 EST 2009
> -----Original Message-----
> From: Joachim Foerster [mailto:JOFT at gmx.de]
> Sent: Friday, June 05, 2009 9:34 AM
> To: linuxppc-dev at ozlabs.org; John Linn;
dbrownell at users.sourceforge.net
> Cc: lorenz at missinglinkelectronics.com;
joachim at missinglinkelectronics.com
> Subject: SD card over (xilinx_)SPI, timeout error while CID
>
> Hi,
>
> we have a very strange problem with SD-card-over-SPI support using
> 2.6.29.4 on our custom PowerPC 405 (Virtex-4 FX FPGA) based board. To
> summarize the problem in one sentence: mmc_spi gets a timeout (error
> -110) after sending MMC command "CMD10" (CID, card identification?).
>
> The attached log file shows device registration messages during bootup
> and debug/error messages after inserting a SD card.
>
> ATM we are migrating from 2.6.26 (old arch/ppc-based, non-device-tree)
> to the already mentioned version 2.6.29.4 (arch/powerpc, device tree).
> We use Xilinx' opb_spi core (v1.00.e, EDK 9.1.02i) inside the FPGA,
> which is connected to a SD card slot. With our old 2.6.26 kernel, SD
> cards _are working fine_!.
>
> To solve the problem, among other things, we tried 2.6.26+arch/powerpc
> (applying only necessary patches to support/include SPI, MMC OF
> bindings) - but the result is the same (error -110). The same is also
> true for
> 2.6.28+arch/powerpc and Linus-HEAD+arch/powerpc . Then we checked
these
> patches, which add OF bindings for
> SPI/MMC/..., line by line and did not find any hint.
> For debugging we added a lot of printks ;-) and noticed that then
there
> are less timeouts (error -110), but CRC check errors (-EILSEQ,
> mmc_spi.c, mmc_spi_readblock) happen - maybe even signal
shifts/sampling
> errors?
>
> To complete confusion :-( the same setup (xilinx_spi+opb_spi) using an
> ADS7846 touchscreen controller as SPI slave _does work_ correctly
>
> Our current guess is, that it could be a more "basic" (?) error in
> arch/powerpc . But we have no lead ATM.
>
> Any hints? Does anybody use SD card support with mmc_spi+xilinx_spi ?
>
There were definitely some changes to the spi driver as I had to make it
use the device tree.
I have not tested with SD as I don't have a board with SD memory. I have
only tested
with a serial eeprom.
Sorry not much help. If I had to guess I would also think it might be
device tree related.
-- John
> Joachim
>
> --
> for reference: relevant DTS entry:
>
> opb_spi_0: spi at 41240000 {
> #address-cells = <1>;
> #size-cells = <0>;
>
> compatible = "xlnx,opb-spi-1.00.e";
> reg = <0x41240000 0x10000>;
> interrupt-parent = <&opb_intc_0>;
> interrupts = <7 2>;
>
> xlnx,depth = <0x10>;
> xlnx,dev-blk-id = <0x4>;
> xlnx,dev-mir-enable = <0x0>;
> xlnx,family = "virtex4";
> xlnx,fifo-exist = <0x1>;
> xlnx,interrupt-present = <0x1>;
> xlnx,ip-reg-bar-offset = <0x60>;
> xlnx,num-bits-reg = <0x8>;
> xlnx,num-bits-sr = <0x8>;
> xlnx,num-offchip-ss-bits = <0x0>;
> xlnx,num-ss-bits = <0x1>;
> xlnx,occupancy-num-bits = <0x4>;
> xlnx,spi-slave-only = <0x0>;
>
> mmc-slot at 0 {
> compatible = "mmc-spi-slot";
> reg = <0>;
> gpios = <&opb_gpio_1 0 1>;
> voltage-ranges = <3300 3300>;
> spi-max-frequency = <6250000>;
> };
> };
>
> dmesg during boot sequence, messages concerning SPI and MMC/SD only:
>
> [ 30.677087] xilinx-xps-spi 41240000.spi: at 0x41240000 mapped to
> 0xC9040000, irq=18
> [ 30.875967] mmc_spi spi32766.0: SD/MMC host mmc0, no WP, no
poweroff,
> cd polling
>
> dmesg after inserting a SD card:
>
> [ 105.375146] mmc0: clock 0Hz busmode 2 powermode 1 cs 1 Vdd 21 width
0
> timing 0
> [ 105.381246] mmc_spi spi32766.0: mmc_spi: power up (21)
> [ 105.388286] mmc0: clock 400000Hz busmode 2 powermode 2 cs 1 Vdd 21
> width 0 timing 0
> [ 105.394839] mmc_spi spi32766.0: mmc_spi: power on (21)
> [ 105.400197] mmc_spi spi32766.0: xilinx_spi_setup, unsupported mode
> bits 4
> [ 105.406601] mmc_spi spi32766.0: can't change chip-select polarity
> [ 105.414666] mmc0: starting CMD0 arg 00000000 flags 000000c0
> [ 105.419176] mmc_spi spi32766.0: mmc_spi: CMD0, resp R1
> [ 105.424511] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.431557] mmc0: req done (CMD0): 0: 00000001 00000000 00000000
> 00000000
> [ 105.439251] mmc0: starting CMD8 arg 000001aa flags 000002f5
> [ 105.443770] mmc_spi spi32766.0: mmc_spi: CMD8, resp R3/R4/R7
> [ 105.449740] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.456789] mmc0: req done (CMD8): 0: 00000001 000001aa 00000000
> 00000000
> [ 105.463502] mmc0: starting CMD5 arg 00000000 flags 000002e1
> [ 105.468999] mmc_spi spi32766.0: mmc_spi: CMD5, resp R3/R4/R7
> [ 105.474968] mmc_spi spi32766.0: ... CMD5 response SPI_R3/R4/R:
resp
> 0005 ffffffff
> [ 105.482448] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.489606] mmc0: req done (CMD5): -22: 00000005 ffffffff 00000000
> 00000000
> [ 105.496511] mmc0: starting CMD55 arg 00000000 flags 000000f5
> [ 105.502092] mmc_spi spi32766.0: mmc_spi: CMD55, resp R1
> [ 105.507645] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.514650] mmc0: req done (CMD55): 0: 00000001 00000000 00000000
> 00000000
> [ 105.521476] mmc0: starting CMD41 arg 00000000 flags 000000e1
> [ 105.527055] mmc_spi spi32766.0: mmc_spi: CMD41, resp R1
> [ 105.532615] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.539646] mmc0: req done (CMD41): 0: 00000001 00000000 00000000
> 00000000
> [ 105.546424] mmc0: starting CMD0 arg 00000000 flags 000000c0
> [ 105.551986] mmc_spi spi32766.0: mmc_spi: CMD0, resp R1
> [ 105.557387] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.564440] mmc0: req done (CMD0): 0: 00000001 00000000 00000000
> 00000000
> [ 105.572158] mmc0: starting CMD58 arg 00000000 flags 00000280
> [ 105.576741] mmc_spi spi32766.0: mmc_spi: CMD58, resp R3/R4/R7
> [ 105.582795] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.589846] mmc0: req done (CMD58): 0: 00000001 00ff8000 00000000
> 00000000
> [ 105.596650] mmc0: clock 400000Hz busmode 2 powermode 2 cs 1 Vdd 20
> width 0 timing 0
> [ 105.604258] mmc0: starting CMD0 arg 00000000 flags 000000c0
> [ 105.609744] mmc_spi spi32766.0: mmc_spi: CMD0, resp R1
> [ 105.615214] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.622217] mmc0: req done (CMD0): 0: 00000001 00000000 00000000
> 00000000
> [ 105.629975] mmc0: starting CMD8 arg 000001aa flags 000002f5
> [ 105.634459] mmc_spi spi32766.0: mmc_spi: CMD8, resp R3/R4/R7
> [ 105.640457] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.647472] mmc0: req done (CMD8): 0: 00000001 000001aa 00000000
> 00000000
> [ 105.654162] mmc0: starting CMD55 arg 00000000 flags 000000f5
> [ 105.659796] mmc_spi spi32766.0: mmc_spi: CMD55, resp R1
> [ 105.665301] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.672372] mmc0: req done (CMD55): 0: 00000001 00000000 00000000
> 00000000
> [ 105.679157] mmc0: starting CMD41 arg 40000000 flags 000000e1
> [ 105.684737] mmc_spi spi32766.0: mmc_spi: CMD41, resp R1
> [ 105.690267] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.697327] mmc0: req done (CMD41): 0: 00000001 00000000 00000000
> 00000000
> ...
> CMD55 + CMD41 repeated 3 times, same messages as above.
> ...
> [ 105.895962] mmc0: starting CMD59 arg 00000001 flags 00000080
> [ 105.901545] mmc_spi spi32766.0: mmc_spi: CMD59, resp R1
> [ 105.907129] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.914091] mmc0: req done (CMD59): 0: 00000000 00000000 00000000
> 00000000
> [ 105.920964] mmc0: starting CMD10 arg 00000000 flags 000000b5
> [ 105.926517] mmc0: blksz 16 blocks 1 flags 00000200 tsac 0 ms
nsac
> 64
> [ 105.933195] mmc_spi spi32766.0: mmc_spi: CMD10, resp R1
> [ 105.938693] mmc_spi spi32766.0: mmc_spi: read block, 16 bytes
> [ 105.944823] mmc_spi spi32766.0: read error ffffff92 (-110)
> [ 105.950015] mmc_spi spi32766.0: read status -110
> [ 105.954579] mmc_spi spi32766.0: xilinx_spi_setup, mode 0, 8 bits/w,
0
> nsec/bit
> [ 105.961806] mmc0: req done (CMD10): 0: 00000000 00000000 00000000
> 00000000
> [ 105.968609] mmc0: 0 bytes transferred: -110
> [ 105.973082] mmc0: clock 0Hz busmode 2 powermode 0 cs 1 Vdd 0 width
0
> timing 0
> [ 105.980189] mmc_spi spi32766.0: mmc_spi: power off (0)
> [ 105.985254] mmc0: error -110 whilst initialising SD card
>
>
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