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Revision fb65d872d7a8dc629837a49513911d0281577bfd authored by Linus Torvalds on 24 April 2015, 15:10:53 UTC, committed by Linus Torvalds on 24 April 2015, 15:10:53 UTC 
Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm
 
Pull ARM fixes from Russell King:
 "A few fixes for the recently merged development updates:

   - the update to convert a code branch in the procinfo structure
     forgot to update the nommu code.

   - VDSO only supported for V7 CPUs and later.

   - VDSO build creates files which should be ignored by git but are not.

   - ensure that make arch/arm/vdso/ doesn't build if it isn't enabled"

* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm:
  ARM: 8344/1: VDSO: honor CONFIG_VDSO in Makefile
  ARM: 8343/1: VDSO: add build artifacts to .gitignore
  ARM: Fix nommu booting
  ARM: 8342/1: VDSO: depend on CPU_V7
2 parent s 05f0c55 + 6b7acae
Raw File
pci_iomap.c 
/*
 * 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_range - create a virtual mapping cookie for a PCI BAR
 * @dev: PCI device that owns the BAR
 * @bar: BAR number
 * @offset: map memory at the given offset in BAR
 * @maxlen: max 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 from offset to the end, pass %0 here.
 * */
void __iomem *pci_iomap_range(struct pci_dev *dev,
			      int bar,
			      unsigned long offset,
			      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 <= offset || !start)
		return NULL;
	len -= offset;
	start += offset;
	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_range);

/**
 * 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)
{
	return pci_iomap_range(dev, bar, 0, maxlen);
}
EXPORT_SYMBOL(pci_iomap);
#endif /* CONFIG_PCI */
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