From: Johan Borkhuis <j.borkhuis@dutchspace•nl>
To: linuxppc-embedded@ozlabs•org
Subject: Problem initialising PCI device
Date: Tue, 13 Mar 2007 16:28:01 +0100 [thread overview]
Message-ID: <45F6C301.6080502@dutchspace.nl> (raw)
I am working with a MEN A14C board (PPC 8540), and I am trying to get a
Reflective Memory card (VMIC 5565) working in one of the PMC slots
using Linux (ELinOS).
When I load the driver I am able to access the registers of the card
using the pci access routines (pci_read_config_word, etc.), but when I
try to access the registers or the memory on the card using memory
mapped access this does not work.
The PMC bus is separated from the main PCI bus by a PCI-PCI bridge (Hint
Corp HB2 PCI-PCI Bridge (rev 04), vendor 0x3388, device 0x0026). For
some other devices (that are connected directly to the PCI bus) I don't
have any problems accessing the memory directly.
Am I forgetting something, or is there something else wrong here?
Below is the code I use to access the reflective memory card (this code
is cut from the _init_one function):
pci_enable_device(dev);
err = pci_request_regions(dev, "RFM");
if (err != 0) {
os_print(OS_ERR "Cannot obtain PCI resources\n");
return( -ENOMEM );
}
/* Get the physical address of the local and runtime registers */
unit->physAddrOr = pci_resource_start(dev, 0);
data->orRegs = ioremap_nocache(unit->physAddrOr, 0x40);
/* Get the physical address of the control and status registers */
unit->physAddrCs = pci_resource_start(dev, 2);
data->csRegs = ioremap_nocache(unit->physAddrCs, 0x40);
printk(KERN_ERR "OR: %8.8x, CS: %8.8x\n", unit->physAddrOr,
unit->physAddrCs);
printk(KERN_ERR "OR: %8.8x, CS: %8.8x\n", data->orRegs, data->csRegs);
for(i = 0; i < 4; i++)
{
printk( KERN_ERR"%2.2x: %8.8x\n", i, os_readl(data->csRegs + i*4));
}
The code above generates the following output:
OR: dffffe00, CS: dffffdc0
OR: e106ae00, CS: e106cdc0
00: 86000300
01: 86000300
02: 86000300
03: 86000300
I would expect the data from the card, as reported by lspci. So instead
of "00: 86000300" I would expect something like "00:5565114a", which is
the ident of the card.
Thank you for your time and (hopefully) your answer.
Kind regard,
Johan Borkhuis
reply other threads:[~2007-03-13 15:40 UTC|newest]
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