pci_iomap_range — create a virtual mapping cookie for a PCI BAR
void __iomem * pci_iomap_range ( | struct pci_dev * dev, |
| int bar, | |
| unsigned long offset, | |
unsigned long maxlen); |
devPCI device that owns the BAR
barBAR number
offsetmap memory at the given offset in BAR
maxlenmax length of the memory to map
Using this function you will get a __iomem address to your device BAR. You can access it using ioread*() and iowrite*(). These functions hide the details if this is a MMIO or PIO address space and will just do what you expect from them in the correct way.
maxlen specifies the maximum length to map. If you want to get access to
the complete BAR from offset to the end, pass 0 here.