pci_iomap.c

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    1 /*
    2  * Implement the default iomap interfaces
    3  *
    4  * (C) Copyright 2004 Linus Torvalds
    5  */
    6 #include <linux/pci.h>
    7 #include <linux/io.h>
    8 
    9 #include <linux/export.h>
   10 
   11 #ifdef CONFIG_PCI
   12 /**
   13  * pci_iomap - create a virtual mapping cookie for a PCI BAR
   14  * @dev: PCI device that owns the BAR
   15  * @bar: BAR number
   16  * @maxlen: length of the memory to map
   17  *
   18  * Using this function you will get a __iomem address to your device BAR.
   19  * You can access it using ioread*() and iowrite*(). These functions hide
   20  * the details if this is a MMIO or PIO address space and will just do what
   21  * you expect from them in the correct way.
   22  *
   23  * @maxlen specifies the maximum length to map. If you want to get access to
   24  * the complete BAR without checking for its length first, pass %0 here.
   25  * */
   26 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
   27 {
   28         resource_size_t start = pci_resource_start(dev, bar);
   29         resource_size_t len = pci_resource_len(dev, bar);
   30         unsigned long flags = pci_resource_flags(dev, bar);
   31 
   32         if (!len || !start)
   33                 return NULL;
   34         if (maxlen && len > maxlen)
   35                 len = maxlen;
   36         if (flags & IORESOURCE_IO)
   37                 return __pci_ioport_map(dev, start, len);
   38         if (flags & IORESOURCE_MEM) {
   39                 if (flags & IORESOURCE_CACHEABLE)
   40                         return ioremap(start, len);
   41                 return ioremap_nocache(start, len);
   42         }
   43         /* What? */
   44         return NULL;
   45 }
   46 
   47 EXPORT_SYMBOL(pci_iomap);
   48 #endif /* CONFIG_PCI */

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FreeBSD/Linux Kernel Cross Reference sys/lib/pci_iomap.c

FreeBSD/Linux Kernel Cross Reference
sys/lib/pci_iomap.c