[#4558] DMA with SPI flash doesnt work on BF533-STAMP w/W25X10

Submitted By: Mike Frysinger

Open Date

2008-10-21 05:09:01 Close Date

2009-07-03 01:31:35

Priority:

Medium Assignee:

Mike Frysinger

Status:

Closed Fixed In Release:

N/A

Found In Release:

N/A Release:

svn trunk

Category:

N/A Board:

STAMP

Processor:

BF533 Silicon Revision:

Is this bug repeatable?:

Yes Resolution:

Fixed

Uboot version or rev.:

Toolchain version or rev.:

trunk head

App binary format:

N/A

Summary: DMA with SPI flash doesnt work on BF533-STAMP w/W25X10

Details:

using a BF533-STAMP here with a W25X10 SPI flash. it works fine when enable_dma is disabled, but doesnt work at all when turning DMA on. i get just 0xff bytes back when trying to read the device.

U-Boot 1.1.6-svn1423 (ADI-2009R1-pre) (Oct 18 2008 - 05:53:43)

CPU: ADSP bf533-0.3 (Detected Rev: 0.3)

Board: ADI BF533 Stamp board

Support: blackfin.uclinux.org/

Clock: VCO: 497 MHz, Core: 497 MHz, System: 99 MHz

RAM: 128 MB

Flash: 4 MB

In: serial

Out: serial

Err: serial

Net: SMC91111 at 0x20300300

MAC: 00:E0:22:FE:05:3F

Hit any key to stop autoboot: 0

TFTP from server 192.168.0.2; our IP address is 192.168.0.15

Filename 'uImage'.

Load address: 0x1000000

Loading: #################################################################

#################################################################

###############################################################

done

Bytes transferred = 4647845 (46eba5 hex)

## Booting image at 01000000 ...

Image Name: Linux-2.6.26.5-ADI-2009R1-pre-sv

Created: 2008-10-21 9:07:07 UTC

Image Type: Blackfin Linux Kernel Image (gzip compressed)

Data Size: 4647781 Bytes = 4.4 MB

Load Address: 00001000

Entry Point: 00186cb8

Verifying Checksum ... OK

Uncompressing Kernel Image ... OK

Starting Kernel at = 186cb8

Linux version 2.6.26.5-ADI-2009R1-pre-svn5461-dirty (vapier@G5) (gcc version 4.3.2 (ADI-trunk/git-fb713f) ) #260 Tue Oct 21 05:07:00 EDT 2008

console [early_BFuart0] enabled

early printk enabled on early_BFuart0

Warning: limiting memory to 56MB due to hardware anomaly 05000263

Board Memory: 128MB

Kernel Managed Memory: 128MB

Memory map:

fixedcode = 0x00000400-0x00000490

text = 0x00001000-0x0010e5c0

rodata = 0x0010e5c0-0x0015da8c

bss = 0x0015daa0-0x0016c708

data = 0x0016c708-0x0017c000

stack = 0x0017a000-0x0017c000

init = 0x0017c000-0x00916000

available = 0x00916000-0x037ff000

DMA Zone = 0x07f00000-0x08000000

Hardware Trace Active and Enabled

Reset caused by Software reset

Compiled for ADSP-BF533 Rev 0.3

Blackfin Linux support by blackfin.uclinux.org/

Processor Speed: 497 MHz core clock and 99 MHz System Clock

NOMPU: setting up cplb tables for global access

Instruction Cache Enabled

Data Cache Enabled (write-through)

Built 1 zonelists in Zone order, mobility grouping off. Total pages: 14223

Kernel command line: root=/dev/mtdblock0 rw earlyprintk=serial,uart0,57600 console=ttyBF0,57600 ip=192.168.0.15:192.168.0.2:192.168.0.1:255.255.255.0:bf533-s

tamp:eth0:off

Configuring Blackfin Priority Driven Interrupts

PID hash table entries: 256 (order: 8, 1024 bytes)

console handover: boot [early_BFuart0] -> real [ttyBF0]

Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)

Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)

Memory available: 47456k/131072k RAM, (7784k init code, 1077k kernel code, 439k data, 1024k dma, 73292k reserved)

Security Framework initialized

Mount-cache hash table entries: 512

Blackfin Scratchpad data SRAM: 4 KB

Blackfin L1 Data A SRAM: 16 KB (15 KB free)

Blackfin L1 Data B SRAM: 16 KB (16 KB free)

Blackfin L1 Instruction SRAM: 64 KB (57 KB free)

net_namespace: 192 bytes

NET: Registered protocol family 16

Blackfin GPIO Controller

Blackfin DMA Controller

stamp_init(): registering device resources

NET: Registered protocol family 2

IP route cache hash table entries: 1024 (order: 0, 4096 bytes)

TCP established hash table entries: 2048 (order: 2, 16384 bytes)

TCP bind hash table entries: 2048 (order: 1, 8192 bytes)

TCP: Hash tables configured (established 2048 bind 2048)

TCP reno registered

NET: Registered protocol family 1

msgmni has been set to 92

io scheduler noop registered

io scheduler anticipatory registered (default)

io scheduler cfq registered

Serial: Blackfin serial driver

bfin-uart.1: ttyBF0 at MMIO 0xffc00400 (irq = 21) is a BFIN-UART

brd: module loaded

smc91x.c: v1.1, sep 22 2004 by Nicolas Pitre <nico@cam.org>

eth0: SMC91C11xFD (rev 1) at 20300300 IRQ 40 [nowait]

eth0: Ethernet addr: 00:e0:22:fe:05:3f

m25p80 spi0.2: w25x10 (128 Kbytes)

Creating 3 MTD partitions on "m25p80":

0x00000000-0x00040000 : "bootloader(spi)"

mtd: partition "bootloader(spi)" extends beyond the end of device "m25p80" -- size truncated to 0x20000

0x00040000-0x00120000 : "linux kernel(spi)"

mtd: partition "linux kernel(spi)" is out of reach -- disabled

0x00120000-0x00020000 : "file system(spi)"

mtd: partition "file system(spi)" is out of reach -- disabled

bfin-spi bfin-spi.0: Blackfin BF5xx on-chip SPI Controller Driver, Version 1.0, regs_base@ffc00500, dma channel@5

rtc-bfin rtc-bfin: rtc core: registered rtc-bfin as rtc0

bfin-wdt: initialized: timeout=20 sec (nowayout=0)

TCP cubic registered

NET: Registered protocol family 17

rtc-bfin rtc-bfin: setting system clock to 1986-02-05 20:46:28 UTC (508020388)

eth0: link down

IP-Config: Complete:

device=eth0, addr=192.168.0.15, mask=255.255.255.0, gw=192.168.0.1,

host=bf533-stamp, domain=, nis-domain=(none),

bootserver=192.168.0.2, rootserver=192.168.0.2, rootpath=

Freeing unused kernel memory: 7784k freed

dma_alloc_init: dma_page @ 0x00913000 - 256 pages at 0x07f00000

eth0: link up, 100Mbps, full-duplex, lpa 0x45E1

_____________________________________

a8888b. / Welcome to the uClinux distribution \

d888888b. / _ _ \

8P"YP"Y88 / | | |_| __ __ (TM) |

8|o||o|88 _____/ | | _ ____ _ _ \ \/ / |

8' .88 \ | | | | _ \| | | | \ / |

8`._.' Y8. \ | |__ | | | | | |_| | / \ |

d/ `8b. \ \____||_|_| |_|\____|/_/\_\ |

dP . Y8b. \ For embedded processors including |

d8:' " `::88b \ the Analog Devices Blackfin /

d8" 'Y88b \___________________________________/

:8P ' :888

8a. : _a88P For further information, check out:

._/"Yaa_: .| 88P| - blackfin.uclinux.org/

\ YP" `| 8P `. - docs.blackfin.uclinux.org/

/ \.___.d| .' - www.uclinux.org/

`--..__)8888P`._.' jgs/a:f - www.analog.com/blackfin

Have a lot of fun...

BusyBox v1.12.1 (2008-10-21 02:08:45 EDT) built-in shell (msh)

Enter 'help' for a list of built-in commands.

root:/> hexdump -C /dev/mtdblock0

00000000 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff |................|

00020000

Follow-ups

--- Mike Frysinger 2008-10-22 15:28:05

looking at the signals, in non-dma mode the CS stays low between the

transmission of the address byte and the actual reading of the data

in dma mode, the cs gets toggled in between and so the chip doesnt send

anything back ...

--- Robin Getz 2008-10-22 22:49:51

I think this is controlled by the CPHA bit in SPI_CTL.

0 - slave select pins controlled by hardware

(the slave select be deasserted between transferred words)

1 - slave select pins controlled by software

(The user must set or clear the appropriate FLGx bits)

--- Mike Frysinger 2008-10-23 02:26:45

it's because we disable the SPI bus before doing a DMA. see bfin_spi_disable()

in pump_transfers() ...

--- Robin Getz 2008-10-23 07:56:21

Hmm - yeah, that is the recommended way to do things. (SPI needs to be

"off" when programming the DMA registers, so that the SPI transactions

don't start before things are set up properly).

I guess - GPIO based SPI selects? I think we already had a task for this...

#4450

Does that need to be done before this will work?

-Robin

--- Mike Frysinger 2008-10-23 20:32:17

we do it in u-boot though

if i change the code around so that it programs the SPI first and then enables

DMA, it seems to work a lot better ...

--- Mike Frysinger 2009-07-03 01:31:35

things should be fine in trunk now

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