diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2006-12-07 15:35:43 +0100 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2007-02-18 21:31:34 +0000 |
commit | 140c1729a221dc6eacfcbf2a073dbf00fad13e43 (patch) | |
tree | b6baff7c6e68f7ca45aacded88b02ccb5f2cd286 /arch/mips/lib/iomap-pci.c | |
parent | 4c1569949a756327aa0ad7aa15a62266b6a00c3e (diff) | |
download | op-kernel-dev-140c1729a221dc6eacfcbf2a073dbf00fad13e43.zip op-kernel-dev-140c1729a221dc6eacfcbf2a073dbf00fad13e43.tar.gz |
[MIPS] Iomap implementation.
This implementation has support for the concept of one separate ioport
address space by PCI domain. A pointer to the virtual address where
the port space of a domain has been mapped has been added to struct
pci_controller and systems should be fixed to fill in this value. For
single domain systems this will be the same value as passed to
set_io_port_base().
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/lib/iomap-pci.c')
-rw-r--r-- | arch/mips/lib/iomap-pci.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/mips/lib/iomap-pci.c b/arch/mips/lib/iomap-pci.c new file mode 100644 index 0000000..c11b249 --- /dev/null +++ b/arch/mips/lib/iomap-pci.c @@ -0,0 +1,74 @@ +/* + * Implement the default iomap interfaces + * + * (C) Copyright 2004 Linus Torvalds + * (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org> + * (C) Copyright 2007 MIPS Technologies, Inc. + * written by Ralf Baechle <ralf@linux-mips.org> + */ +#include <linux/pci.h> +#include <linux/module.h> +#include <asm/io.h> + +static void __iomem *ioport_map_pci(struct pci_dev *dev, + unsigned long port, unsigned int nr) +{ + struct pci_controller *ctrl = dev->bus->sysdata; + unsigned long base = ctrl->io_map_base; + + /* This will eventually become a BUG_ON but for now be gentle */ + if (unlikely(!ctrl->io_map_base)) { + struct pci_bus *bus = dev->bus; + char name[8]; + + while (bus->parent) + bus = bus->parent; + + ctrl->io_map_base = base = mips_io_port_base; + + sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number); + printk(KERN_WARNING "io_map_base of root PCI bus %s unset. " + "Trying to continue but you better\nfix this issue or " + "report it to linux-mips@linux-mips.org or your " + "vendor.\n", name); +#ifdef CONFIG_PCI_DOMAINS + panic("To avoid data corruption io_map_base MUST be set with " + "multiple PCI domains."); +#endif + } + + return (void __iomem *) (ctrl->io_map_base + port); +} + +/* + * Create a virtual mapping cookie for a PCI BAR (memory or IO) + */ +void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen) +{ + unsigned long start = pci_resource_start(dev, bar); + unsigned long 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_pci(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); + +void pci_iounmap(struct pci_dev *dev, void __iomem * addr) +{ + iounmap(addr); +} + +EXPORT_SYMBOL(pci_iounmap); |