1 #ifndef __GENERIC_IO_H
2 #define __GENERIC_IO_H
3
4 #include <linux/linkage.h>
5 #include <asm/byteorder.h>
6
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 */
16
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 ioread8(void __iomem *);
29 extern unsigned int ioread16(void __iomem *);
30 extern unsigned int ioread16be(void __iomem *);
31 extern unsigned int ioread32(void __iomem *);
32 extern unsigned int ioread32be(void __iomem *);
33
34 extern void iowrite8(u8, void __iomem *);
35 extern void iowrite16(u16, void __iomem *);
36 extern void iowrite16be(u16, void __iomem *);
37 extern void iowrite32(u32, void __iomem *);
38 extern void iowrite32be(u32, void __iomem *);
39
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 ioread8_rep(void __iomem *port, void *buf, unsigned long count);
52 extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
53 extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
54
55 extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
56 extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
57 extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
58
59 #ifdef CONFIG_HAS_IOPORT_MAP
60 /* Create a virtual mapping cookie for an IO port range */
61 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
62 extern void ioport_unmap(void __iomem *);
63 #endif
64
65 #ifndef ARCH_HAS_IOREMAP_WC
66 #define ioremap_wc ioremap_nocache
67 #endif
68
69 #ifdef CONFIG_PCI
70 /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
71 struct pci_dev;
72 extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
73 #elif defined(CONFIG_GENERIC_IOMAP)
74 struct pci_dev;
pci_iounmap(struct pci_dev * dev,void __iomem * addr)75 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
76 { }
77 #endif
78
79 #include <asm-generic/pci_iomap.h>
80
81 #endif
82