| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | #ifndef __GENERIC_IO_H |
| 2 | #define __GENERIC_IO_H |
| 3 | |
| 4 | #include <linux/linkage.h> |
| 5 | |
| 6 | /* |
| 7 | * These are the "generic" interfaces for doing new-style |
| 8 | * memory-mapped or PIO accesses. Architectures may do |
| 9 | * their own arch-optimized versions, these just act as |
| 10 | * wrappers around the old-style IO register access functions: |
| 11 | * read[bwl]/write[bwl]/in[bwl]/out[bwl] |
| 12 | * |
| 13 | * Don't include this directly, include it from <asm/io.h>. |
| 14 | */ |
| 15 | |
| 16 | /* |
| 17 | * Read/write from/to an (offsettable) iomem cookie. It might be a PIO |
| 18 | * access or a MMIO access, these functions don't care. The info is |
| 19 | * encoded in the hardware mapping set up by the mapping functions |
| 20 | * (or the cookie itself, depending on implementation and hw). |
| 21 | * |
| 22 | * The generic routines just encode the PIO/MMIO as part of the |
| 23 | * cookie, and coldly assume that the MMIO IO mappings are not |
| 24 | * in the low address range. Architectures for which this is not |
| 25 | * true can't use this generic implementation. |
| 26 | */ |
| 27 | extern unsigned int fastcall ioread8(void __iomem *); |
| 28 | extern unsigned int fastcall ioread16(void __iomem *); |
| 29 | extern unsigned int fastcall ioread32(void __iomem *); |
| 30 | |
| 31 | extern void fastcall iowrite8(u8, void __iomem *); |
| 32 | extern void fastcall iowrite16(u16, void __iomem *); |
| 33 | extern void fastcall iowrite32(u32, void __iomem *); |
| 34 | |
| 35 | /* |
| 36 | * "string" versions of the above. Note that they |
| 37 | * use native byte ordering for the accesses (on |
| 38 | * the assumption that IO and memory agree on a |
| 39 | * byte order, and CPU byteorder is irrelevant). |
| 40 | * |
| 41 | * They do _not_ update the port address. If you |
| 42 | * want MMIO that copies stuff laid out in MMIO |
| 43 | * memory across multiple ports, use "memcpy_toio()" |
| 44 | * and friends. |
| 45 | */ |
| 46 | extern void fastcall ioread8_rep(void __iomem *port, void *buf, unsigned long count); |
| 47 | extern void fastcall ioread16_rep(void __iomem *port, void *buf, unsigned long count); |
| 48 | extern void fastcall ioread32_rep(void __iomem *port, void *buf, unsigned long count); |
| 49 | |
| 50 | extern void fastcall iowrite8_rep(void __iomem *port, const void *buf, unsigned long count); |
| 51 | extern void fastcall iowrite16_rep(void __iomem *port, const void *buf, unsigned long count); |
| 52 | extern void fastcall iowrite32_rep(void __iomem *port, const void *buf, unsigned long count); |
| 53 | |
| 54 | /* Create a virtual mapping cookie for an IO port range */ |
| 55 | extern void __iomem *ioport_map(unsigned long port, unsigned int nr); |
| 56 | extern void ioport_unmap(void __iomem *); |
| 57 | |
| 58 | /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ |
| 59 | struct pci_dev; |
| 60 | extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); |
| 61 | extern void pci_iounmap(struct pci_dev *dev, void __iomem *); |
| 62 | |
| 63 | #endif |