140c1729a2
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>
75 lines
2 KiB
C
75 lines
2 KiB
C
/*
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* Implement the default iomap interfaces
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*
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* (C) Copyright 2004 Linus Torvalds
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* (C) Copyright 2006 Ralf Baechle <ralf@linux-mips.org>
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* (C) Copyright 2007 MIPS Technologies, Inc.
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* written by Ralf Baechle <ralf@linux-mips.org>
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*/
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#include <linux/pci.h>
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#include <linux/module.h>
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#include <asm/io.h>
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static void __iomem *ioport_map_pci(struct pci_dev *dev,
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unsigned long port, unsigned int nr)
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{
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struct pci_controller *ctrl = dev->bus->sysdata;
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unsigned long base = ctrl->io_map_base;
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/* This will eventually become a BUG_ON but for now be gentle */
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if (unlikely(!ctrl->io_map_base)) {
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struct pci_bus *bus = dev->bus;
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char name[8];
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while (bus->parent)
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bus = bus->parent;
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ctrl->io_map_base = base = mips_io_port_base;
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sprintf(name, "%04x:%02x", pci_domain_nr(bus), bus->number);
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printk(KERN_WARNING "io_map_base of root PCI bus %s unset. "
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"Trying to continue but you better\nfix this issue or "
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"report it to linux-mips@linux-mips.org or your "
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"vendor.\n", name);
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#ifdef CONFIG_PCI_DOMAINS
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panic("To avoid data corruption io_map_base MUST be set with "
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"multiple PCI domains.");
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#endif
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}
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return (void __iomem *) (ctrl->io_map_base + port);
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}
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/*
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* Create a virtual mapping cookie for a PCI BAR (memory or IO)
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*/
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void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
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{
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unsigned long start = pci_resource_start(dev, bar);
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unsigned long len = pci_resource_len(dev, bar);
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unsigned long flags = pci_resource_flags(dev, bar);
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if (!len || !start)
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return NULL;
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if (maxlen && len > maxlen)
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len = maxlen;
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if (flags & IORESOURCE_IO)
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return ioport_map_pci(dev, start, len);
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if (flags & IORESOURCE_MEM) {
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if (flags & IORESOURCE_CACHEABLE)
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return ioremap(start, len);
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return ioremap_nocache(start, len);
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}
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/* What? */
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return NULL;
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}
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EXPORT_SYMBOL(pci_iomap);
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void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
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{
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iounmap(addr);
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}
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EXPORT_SYMBOL(pci_iounmap);
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