vijay patel wrote:
>
> Hello ,
> I want to write a device driver for a PCI card on RTLinux . Any
> expert can tell me is there any functions available to read/write PCI
> configuration space ?
> if not then How I can know the IRQ and base address assigned to the card ?
>
> Thanks in advance !
> --Vijay Patel
>
See /usr/include/linux/pci.h for a list of available
functions and defines.
Here is some example code from an actual
driver (LBRegs is set to PCI_BASE_ADDRESS_0):
int Init_PCI(void) {
u32 tmp_addr;
int err;
if (!pci_present()) {
printk("<1>No PCI\n");
return -1;
}
/* searching for device */
dev = NULL;
dev = pci_find_device(PCI_VendorID,PCI_DeviceID,dev);
if (dev == NULL) {
printk("<1>PCI Device not found\n");
return -1;
}
/* Reading configuration space */
pci_read_config_dword(dev,LBRegs,&tmp_addr);
/* Computing I/O base address */
RegBase = (tmp_addr & 0xFFFE);
return 0;
}
Have a nice day,
Iwo
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