| /* |
| * Implement the default iomap interfaces |
| * |
| * (C) Copyright 2004 Linus Torvalds |
| */ |
| #include <linux/pci.h> |
| #include <linux/io.h> |
| |
| #include <linux/export.h> |
| |
| #ifdef CONFIG_PCI |
| /** |
| * pci_iomap - create a virtual mapping cookie for a PCI BAR |
| * @dev: PCI device that owns the BAR |
| * @bar: BAR number |
| * @maxlen: 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 without checking for its length first, pass %0 here. |
| * */ |
| void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) |
| { |
| resource_size_t start = pci_resource_start(dev, bar); |
| resource_size_t len = pci_resource_len(dev, bar); |
| unsigned long flags = pci_resource_flags(dev, bar); |
| |
| if (!len || !start) |
| return NULL; |
| if (maxlen && len > maxlen) |
| len = maxlen; |
| if (flags & IORESOURCE_IO) |
| return ioport_map(start, len); |
| if (flags & IORESOURCE_MEM) { |
| if (flags & IORESOURCE_CACHEABLE) |
| return ioremap(start, len); |
| return ioremap_nocache(start, len); |
| } |
| /* What? */ |
| return NULL; |
| } |
| |
| EXPORT_SYMBOL(pci_iomap); |
| #endif /* CONFIG_PCI */ |