ia64/linux-2.6.18-xen.hg

view include/asm-generic/iomap.h @ 782:9ab1c319531f

merge with linux-2.6.18-xen.hg
author Isaku Yamahata <yamahata@valinux.co.jp>
date Wed Jan 28 13:07:23 2009 +0900 (2009-01-28)
parents 831230e53067
children
line source
1 #ifndef __GENERIC_IO_H
2 #define __GENERIC_IO_H
4 #include <linux/linkage.h>
5 #include <asm/byteorder.h>
7 /*
8 * These are the "generic" interfaces for doing new-style
9 * memory-mapped or PIO accesses. Architectures may do
10 * their own arch-optimized versions, these just act as
11 * wrappers around the old-style IO register access functions:
12 * read[bwl]/write[bwl]/in[bwl]/out[bwl]
13 *
14 * Don't include this directly, include it from <asm/io.h>.
15 */
17 /*
18 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
19 * access or a MMIO access, these functions don't care. The info is
20 * encoded in the hardware mapping set up by the mapping functions
21 * (or the cookie itself, depending on implementation and hw).
22 *
23 * The generic routines just encode the PIO/MMIO as part of the
24 * cookie, and coldly assume that the MMIO IO mappings are not
25 * in the low address range. Architectures for which this is not
26 * true can't use this generic implementation.
27 */
28 extern unsigned int fastcall ioread8(void __iomem *);
29 extern unsigned int fastcall ioread16(void __iomem *);
30 extern unsigned int fastcall ioread16be(void __iomem *);
31 extern unsigned int fastcall ioread32(void __iomem *);
32 extern unsigned int fastcall ioread32be(void __iomem *);
34 extern void fastcall iowrite8(u8, void __iomem *);
35 extern void fastcall iowrite16(u16, void __iomem *);
36 extern void fastcall iowrite16be(u16, void __iomem *);
37 extern void fastcall iowrite32(u32, void __iomem *);
38 extern void fastcall iowrite32be(u32, void __iomem *);
40 /*
41 * "string" versions of the above. Note that they
42 * use native byte ordering for the accesses (on
43 * the assumption that IO and memory agree on a
44 * byte order, and CPU byteorder is irrelevant).
45 *
46 * They do _not_ update the port address. If you
47 * want MMIO that copies stuff laid out in MMIO
48 * memory across multiple ports, use "memcpy_toio()"
49 * and friends.
50 */
51 extern void fastcall ioread8_rep(void __iomem *port, void *buf, unsigned long count);
52 extern void fastcall ioread16_rep(void __iomem *port, void *buf, unsigned long count);
53 extern void fastcall ioread32_rep(void __iomem *port, void *buf, unsigned long count);
55 extern void fastcall iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
56 extern void fastcall iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
57 extern void fastcall iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
59 /* Create a virtual mapping cookie for an IO port range */
60 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
61 extern void ioport_unmap(void __iomem *);
63 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
64 struct pci_dev;
65 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
66 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
68 #endif