pci_iomap_wc (9) - Linux Man Pages

pci_iomap_wc: create a virtual WC mapping cookie for a PCI BAR

NAME

pci_iomap_wc - create a virtual WC mapping cookie for a PCI BAR

SYNOPSIS

void __iomem * pci_iomap_wc(struct pci_dev dev, int bar, unsigned long maxlen);

ARGUMENTS

dev

PCI device that owns the BAR

bar

BAR number

maxlen

length of the memory to map

DESCRIPTION

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. When possible write combining is used.

maxlen specifies the maximum length to map. If you want to get access to the complete BAR without checking for its length first, pass 0 here.

AUTHORS

Matthew Wilcox <matthew [at] wil.cx>

Author.

Alan Cox <alan [at] lxorguk.ukuu.org.uk>

Author.

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