11da177e4SLinus Torvalds #ifndef __GENERIC_IO_H 21da177e4SLinus Torvalds #define __GENERIC_IO_H 31da177e4SLinus Torvalds 41da177e4SLinus Torvalds #include <linux/linkage.h> 5dae409a2SJames Bottomley #include <asm/byteorder.h> 61da177e4SLinus Torvalds 71da177e4SLinus Torvalds /* 81da177e4SLinus Torvalds * These are the "generic" interfaces for doing new-style 91da177e4SLinus Torvalds * memory-mapped or PIO accesses. Architectures may do 101da177e4SLinus Torvalds * their own arch-optimized versions, these just act as 111da177e4SLinus Torvalds * wrappers around the old-style IO register access functions: 121da177e4SLinus Torvalds * read[bwl]/write[bwl]/in[bwl]/out[bwl] 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Don't include this directly, include it from <asm/io.h>. 151da177e4SLinus Torvalds */ 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds /* 181da177e4SLinus Torvalds * Read/write from/to an (offsettable) iomem cookie. It might be a PIO 191da177e4SLinus Torvalds * access or a MMIO access, these functions don't care. The info is 201da177e4SLinus Torvalds * encoded in the hardware mapping set up by the mapping functions 211da177e4SLinus Torvalds * (or the cookie itself, depending on implementation and hw). 221da177e4SLinus Torvalds * 231da177e4SLinus Torvalds * The generic routines just encode the PIO/MMIO as part of the 241da177e4SLinus Torvalds * cookie, and coldly assume that the MMIO IO mappings are not 251da177e4SLinus Torvalds * in the low address range. Architectures for which this is not 261da177e4SLinus Torvalds * true can't use this generic implementation. 271da177e4SLinus Torvalds */ 28144b2a91SHarvey Harrison extern unsigned int ioread8(void __iomem *); 29144b2a91SHarvey Harrison extern unsigned int ioread16(void __iomem *); 30144b2a91SHarvey Harrison extern unsigned int ioread16be(void __iomem *); 31144b2a91SHarvey Harrison extern unsigned int ioread32(void __iomem *); 32144b2a91SHarvey Harrison extern unsigned int ioread32be(void __iomem *); 331da177e4SLinus Torvalds 34144b2a91SHarvey Harrison extern void iowrite8(u8, void __iomem *); 35144b2a91SHarvey Harrison extern void iowrite16(u16, void __iomem *); 36144b2a91SHarvey Harrison extern void iowrite16be(u16, void __iomem *); 37144b2a91SHarvey Harrison extern void iowrite32(u32, void __iomem *); 38144b2a91SHarvey Harrison extern void iowrite32be(u32, void __iomem *); 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds /* 411da177e4SLinus Torvalds * "string" versions of the above. Note that they 421da177e4SLinus Torvalds * use native byte ordering for the accesses (on 431da177e4SLinus Torvalds * the assumption that IO and memory agree on a 441da177e4SLinus Torvalds * byte order, and CPU byteorder is irrelevant). 451da177e4SLinus Torvalds * 461da177e4SLinus Torvalds * They do _not_ update the port address. If you 471da177e4SLinus Torvalds * want MMIO that copies stuff laid out in MMIO 481da177e4SLinus Torvalds * memory across multiple ports, use "memcpy_toio()" 491da177e4SLinus Torvalds * and friends. 501da177e4SLinus Torvalds */ 51144b2a91SHarvey Harrison extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count); 52144b2a91SHarvey Harrison extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count); 53144b2a91SHarvey Harrison extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count); 541da177e4SLinus Torvalds 55144b2a91SHarvey Harrison extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count); 56144b2a91SHarvey Harrison extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count); 57144b2a91SHarvey Harrison extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count); 581da177e4SLinus Torvalds 5982ed223cSJonas Bonn #ifdef CONFIG_HAS_IOPORT 601da177e4SLinus Torvalds /* Create a virtual mapping cookie for an IO port range */ 611da177e4SLinus Torvalds extern void __iomem *ioport_map(unsigned long port, unsigned int nr); 621da177e4SLinus Torvalds extern void ioport_unmap(void __iomem *); 6382ed223cSJonas Bonn #endif 641da177e4SLinus Torvalds 651526a756Svenkatesh.pallipadi@intel.com #ifndef ARCH_HAS_IOREMAP_WC 661526a756Svenkatesh.pallipadi@intel.com #define ioremap_wc ioremap_nocache 671526a756Svenkatesh.pallipadi@intel.com #endif 681526a756Svenkatesh.pallipadi@intel.com 6982ed223cSJonas Bonn #ifdef CONFIG_PCI 701da177e4SLinus Torvalds /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */ 711da177e4SLinus Torvalds struct pci_dev; 721da177e4SLinus Torvalds extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max); 731da177e4SLinus Torvalds extern void pci_iounmap(struct pci_dev *dev, void __iomem *); 74fea80311SRandy Dunlap #else 75fea80311SRandy Dunlap struct pci_dev; 76fea80311SRandy Dunlap static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max) 77fea80311SRandy Dunlap { 78fea80311SRandy Dunlap return NULL; 79fea80311SRandy Dunlap } 80fea80311SRandy Dunlap static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) 81fea80311SRandy Dunlap { } 8282ed223cSJonas Bonn #endif 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds #endif 85