Hello
Somehow I can't access a PCI card on a PowerMac. I once wrote a
driver for this card on MacOS8, but that does not seem to help me so
far.
It's a digital I/O card Computer Boards PCI-DIO96H showing this info
in lspci -vvn:
00:0e.0 Class ffff: 1307:0017 (rev 02) (prog-if ff)
Subsystem: 1307:0017
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-
Interrupt: pin A routed to IRQ 24
Region 1: I/O ports at 0800 [disabled] [size=128]
Region 2: I/O ports at 0880 [disabled] [size=16]
This is what I am doing (irrelevant parts stripped):
error= pci_enable_device(mydevicep);
mybase1_phys= pci_resource_start(dev, 2);
mybase1length= pci_resource_len(dev,2);
// gives: address 0x00000880, len 16
error = pci_request_regions (dev, NAME);
pci_set_master (dev);
mybase1= (unsigned long)ioremap(mybase1_phys,mybase1length);
// gives: 0, while the following is printed to the kernel log:
// __ioremap(): phys addr 0 is RAM lr c0010c34
I have also tried the following:
- pass mybase1_phys to phys_to_virt() (this gave 0xc0000880)
and pass that for ioremap. The latter then returned
address 0xc7898880. But I then got this:
Mar 23 17:09:34 Sensor kernel: Machine check in kernel mode.
Mar 23 17:09:34 Sensor kernel: Caused by (from SRR1=49030): Transfer error ack signal
Mar 23 17:09:34 Sensor kernel: Oops: machine check, sig: 7
(...)
- pass mybase1_phys to phys_to_bus(), but insmod then gives
"unresolved symbol phys_to_bus".
- ~same thing for pci_resource_start(dev, 1) instead of 2.
(- and many further combinations)
Questions:
- What does pci_resource_start return, a phys/virt/bus address?
- What does ioremap expect?
- I'm seeing a special case in the source of the C ioremap() version,
which assumes ISA for an address as low as 0x00000880. Thus it seems
like I have to convert that address? On the other hand, the 8139too
driver which I've glimpsed at does not do any conversion.
- do I need pci_set_master? Which other PCI calls are important?
- where do I find up to date information about handling PCI on linux?
The Documentation/pci.txt and Documentation/IO-mapping.txt files
do not mention many important details.
You can see my code at:
http://pflanze.mine.nu/~chris/linux/sensor/sensor.c
Thanks for your help
Christian.
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This archive was generated by hypermail 2b29 : Sun Mar 23 2003 - 22:00:45 EST