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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 | /* 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 *); |
62 | |
63 | #ifndef ARCH_HAS_IOREMAP_WC |
64 | #define ioremap_wc ioremap_nocache |
65 | #endif |
66 | |
67 | /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ |
68 | struct pci_dev; |
69 | extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); |
70 | extern void pci_iounmap(struct pci_dev *dev, void __iomem *); |
71 | |
72 | #endif |
73 |
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Tags:
od-2011-09-04
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