projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 66eab4df MT |
1 | /* |
| 2 | * Implement the default iomap interfaces | |
| 3 | * | |
| 4 | * (C) Copyright 2004 Linus Torvalds | |
| 5 | */ | |
| 6 | #include <linux/pci.h> | |
| 7 | #include <linux/io.h> | |
| 8 | ||
| 9 | #include <linux/export.h> | |
| 10 | ||
| 11 | #ifdef CONFIG_PCI | |
| 12 | /** | |
| 13 | * pci_iomap - create a virtual mapping cookie for a PCI BAR | |
| 14 | * @dev: PCI device that owns the BAR | |
| 15 | * @bar: BAR number | |
| 16 | * @maxlen: length of the memory to map | |
| 17 | * | |
| 18 | * Using this function you will get a __iomem address to your device BAR. | |
| 19 | * You can access it using ioread*() and iowrite*(). These functions hide | |
| 20 | * the details if this is a MMIO or PIO address space and will just do what | |
| 21 | * you expect from them in the correct way. | |
| 22 | * | |
| 23 | * @maxlen specifies the maximum length to map. If you want to get access to | |
| 24 | * the complete BAR without checking for its length first, pass %0 here. | |
| 25 | * */ | |
| 26 | void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) | |
| 27 | { | |
| 28 | resource_size_t start = pci_resource_start(dev, bar); | |
| 29 | resource_size_t len = pci_resource_len(dev, bar); | |
| 30 | unsigned long flags = pci_resource_flags(dev, bar); | |
| 31 | ||
| 32 | if (!len || !start) | |
| 33 | return NULL; | |
| 34 | if (maxlen && len > maxlen) | |
| 35 | len = maxlen; | |
| 36 | if (flags & IORESOURCE_IO) | |
| b923650b | 37 | return __pci_ioport_map(dev, start, len); |
| 66eab4df MT |
38 | if (flags & IORESOURCE_MEM) { |
| 39 | if (flags & IORESOURCE_CACHEABLE) | |
| 40 | return ioremap(start, len); | |
| 41 | return ioremap_nocache(start, len); | |
| 42 | } | |
| 43 | /* What? */ | |
| 44 | return NULL; | |
| 45 | } | |
| 46 | ||
| 47 | EXPORT_SYMBOL(pci_iomap); | |
| 48 | #endif /* CONFIG_PCI */ |