pci_iomap.c

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/*
 * 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

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 */