PCI1520 on IXP425 -- can't read CIS correctly.

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Hi,

I have an IXP425 (ARM/XScale) based board here with a TI PCI1520 CardBus 
controller and a single CF socket.

I'm trying to get the yenta driver in 2.4.21 working.  I've:
   * Added the PCI1520 PCI ID.
   * Manually set the interrupt routing registers to use parallel PCI.
   * Forced the number of sockets to 1 (MAX_SOCKETS == 1) as the second 
socket is wired to a custom CPLD (a CF -> ISA bridge).

This results in card insertions and removables being detected.

The IXP425 only has a 64 Mbyte PCI window so I set the valid memory 
regions in the cardmgr configuration appropriately.  The driver then 
allocates a suitable memory window for the card memory.

The problem is that reads of the CIS from the card don't result in the 
expected data.  I get 0x00 flipping to 0xff (occasionally) and other 
(apparent) garbage.

Checking with a scope I can see actively from the various CF card 
signals -- in particular REG# is active and there's actively on OE# so 
I'm assuming it's trying to read the CIS data.

The board has no EEPROM for preprogramming the PCI1520's registers.  I'm 
fairly sure I'm manually setting them appropriately though.

Attached is the output of lspci -vv -xxx.

David Vrabel
-- 
David Vrabel, Design Engineer

Arcom, Clifton Road           Tel: +44 (0)1223 411200 ext. 3233
Cambridge CB1 7EA, UK         Web: http://www.arcom.com/


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00:02.0 CardBus bridge: Texas Instruments PCI1250 PC card Cardbus Controller (rev 01)
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
	Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
	Latency: 168, Cache Line Size: 0x08 (32 bytes)
	Interrupt: pin A routed to IRQ 7
	Region 0: Memory at 4bffc000 (32-bit, non-prefetchable) [size=4K]
	Bus: primary=00, secondary=01, subordinate=04, sec-latency=176
	Memory window 0: 04000000-043ff000 (prefetchable)
	Memory window 1: 04400000-047ff000
	I/O window 0: 00004000-000040ff
	I/O window 1: 00004400-000044ff
	BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
	16-bit legacy interface ports at 0001
00: 4c 10 55 ac 07 00 10 02 01 00 07 06 08 a8 82 00
10: 00 c0 ff 4b a0 00 00 02 00 01 04 b0 00 00 00 04
20: 00 f0 3f 04 00 00 40 04 00 f0 7f 04 00 40 00 00
30: fc 40 00 00 00 44 00 00 fc 44 00 00 07 01 c0 05
40: 00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00
50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
80: 70 d0 40 0c 00 00 00 00 00 00 00 00 22 00 00 00
90: c0 00 40 60 00 00 00 00 00 00 00 00 00 00 00 00
a0: 01 00 12 fe 00 80 c0 00 01 08 00 00 1f 00 00 00
b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


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