| /* | |
| * 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 __pci_ioport_map(dev, 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 */ |