tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */
28extern unsigned int ioread8(void __iomem *);
29extern unsigned int ioread16(void __iomem *);
30extern unsigned int ioread16be(void __iomem *);
31extern unsigned int ioread32(void __iomem *);
32extern unsigned int ioread32be(void __iomem *);
33#ifdef CONFIG_64BIT
34extern u64 ioread64(void __iomem *);
35extern u64 ioread64be(void __iomem *);
36#endif
37
38extern void iowrite8(u8, void __iomem *);
39extern void iowrite16(u16, void __iomem *);
40extern void iowrite16be(u16, void __iomem *);
41extern void iowrite32(u32, void __iomem *);
42extern void iowrite32be(u32, void __iomem *);
43#ifdef CONFIG_64BIT
44extern void iowrite64(u64, void __iomem *);
45extern void iowrite64be(u64, void __iomem *);
46#endif
47
48/*
49 * "string" versions of the above. Note that they
50 * use native byte ordering for the accesses (on
51 * the assumption that IO and memory agree on a
52 * byte order, and CPU byteorder is irrelevant).
53 *
54 * They do _not_ update the port address. If you
55 * want MMIO that copies stuff laid out in MMIO
56 * memory across multiple ports, use "memcpy_toio()"
57 * and friends.
58 */
59extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count);
60extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count);
61extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count);
62
63extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count);
64extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count);
65extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count);
66
67#ifdef CONFIG_HAS_IOPORT_MAP
68/* Create a virtual mapping cookie for an IO port range */
69extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
70extern void ioport_unmap(void __iomem *);
71#endif
72
73#ifndef ARCH_HAS_IOREMAP_WC
74#define ioremap_wc ioremap_nocache
75#endif
76
77#ifndef ARCH_HAS_IOREMAP_WT
78#define ioremap_wt ioremap_nocache
79#endif
80
81#ifdef CONFIG_PCI
82/* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */
83struct pci_dev;
84extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
85#elif defined(CONFIG_GENERIC_IOMAP)
86struct pci_dev;
87static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
88{ }
89#endif
90
91#include <asm-generic/pci_iomap.h>
92
93#endif