Ralf Baechle | 140c172 | 2006-12-07 15:35:43 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Implement the default iomap interfaces |
| 3 | * |
| 4 | * (C) Copyright 2004 Linus Torvalds |
| 5 | * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org> |
| 6 | * (C) Copyright 2007 MIPS Technologies, Inc. |
| 7 | * written by Ralf Baechle <ralf@linux-mips.org> |
| 8 | */ |
| 9 | #include <linux/pci.h> |
| 10 | #include <linux/module.h> |
| 11 | #include <asm/io.h> |
| 12 | |
| 13 | static void __iomem *ioport_map_pci(struct pci_dev *dev, |
| 14 | unsigned long port, unsigned int nr) |
| 15 | { |
| 16 | struct pci_controller *ctrl = dev->bus->sysdata; |
| 17 | unsigned long base = ctrl->io_map_base; |
| 18 | |
| 19 | /* This will eventually become a BUG_ON but for now be gentle */ |
| 20 | if (unlikely(!ctrl->io_map_base)) { |
| 21 | struct pci_bus *bus = dev->bus; |
| 22 | char name[8]; |
| 23 | |
| 24 | while (bus->parent) |
| 25 | bus = bus->parent; |
| 26 | |
| 27 | ctrl->io_map_base = base = mips_io_port_base; |
| 28 | |
| 29 | sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number); |
| 30 | printk(KERN_WARNING "io_map_base of root PCI bus %s unset. " |
| 31 | "Trying to continue but you better\nfix this issue or " |
| 32 | "report it to linux-mips@linux-mips.org or your " |
| 33 | "vendor.\n", name); |
| 34 | #ifdef CONFIG_PCI_DOMAINS |
| 35 | panic("To avoid data corruption io_map_base MUST be set with " |
| 36 | "multiple PCI domains."); |
| 37 | #endif |
| 38 | } |
| 39 | |
| 40 | return (void __iomem *) (ctrl->io_map_base + port); |
| 41 | } |
| 42 | |
| 43 | /* |
| 44 | * Create a virtual mapping cookie for a PCI BAR (memory or IO) |
| 45 | */ |
| 46 | void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) |
| 47 | { |
| 48 | unsigned long start = pci_resource_start(dev, bar); |
| 49 | unsigned long len = pci_resource_len(dev, bar); |
| 50 | unsigned long flags = pci_resource_flags(dev, bar); |
| 51 | |
| 52 | if (!len || !start) |
| 53 | return NULL; |
| 54 | if (maxlen && len > maxlen) |
| 55 | len = maxlen; |
| 56 | if (flags & IORESOURCE_IO) |
| 57 | return ioport_map_pci(dev, start, len); |
| 58 | if (flags & IORESOURCE_MEM) { |
| 59 | if (flags & IORESOURCE_CACHEABLE) |
| 60 | return ioremap(start, len); |
| 61 | return ioremap_nocache(start, len); |
| 62 | } |
| 63 | /* What? */ |
| 64 | return NULL; |
| 65 | } |
| 66 | |
| 67 | EXPORT_SYMBOL(pci_iomap); |
| 68 | |
| 69 | void pci_iounmap(struct pci_dev *dev, void __iomem * addr) |
| 70 | { |
| 71 | iounmap(addr); |
| 72 | } |
| 73 | |
| 74 | EXPORT_SYMBOL(pci_iounmap); |