1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 21da177e4SLinus Torvalds #ifndef __GENERIC_IO_H 31da177e4SLinus Torvalds #define __GENERIC_IO_H 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds #include <linux/linkage.h> 6dae409a2SJames Bottomley #include <asm/byteorder.h> 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds /* 91da177e4SLinus Torvalds * These are the "generic" interfaces for doing new-style 101da177e4SLinus Torvalds * memory-mapped or PIO accesses. Architectures may do 111da177e4SLinus Torvalds * their own arch-optimized versions, these just act as 121da177e4SLinus Torvalds * wrappers around the old-style IO register access functions: 131da177e4SLinus Torvalds * read[bwl]/write[bwl]/in[bwl]/out[bwl] 141da177e4SLinus Torvalds * 151da177e4SLinus Torvalds * Don't include this directly, include it from <asm/io.h>. 161da177e4SLinus Torvalds */ 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds /* 191da177e4SLinus Torvalds * Read/write from/to an (offsettable) iomem cookie. It might be a PIO 201da177e4SLinus Torvalds * access or a MMIO access, these functions don't care. The info is 211da177e4SLinus Torvalds * encoded in the hardware mapping set up by the mapping functions 221da177e4SLinus Torvalds * (or the cookie itself, depending on implementation and hw). 231da177e4SLinus Torvalds * 241da177e4SLinus Torvalds * The generic routines just encode the PIO/MMIO as part of the 251da177e4SLinus Torvalds * cookie, and coldly assume that the MMIO IO mappings are not 261da177e4SLinus Torvalds * in the low address range. Architectures for which this is not 271da177e4SLinus Torvalds * true can't use this generic implementation. 281da177e4SLinus Torvalds */ 29144b2a91SHarvey Harrison extern unsigned int ioread8(void __iomem *); 30144b2a91SHarvey Harrison extern unsigned int ioread16(void __iomem *); 31144b2a91SHarvey Harrison extern unsigned int ioread16be(void __iomem *); 32144b2a91SHarvey Harrison extern unsigned int ioread32(void __iomem *); 33144b2a91SHarvey Harrison extern unsigned int ioread32be(void __iomem *); 349e44fb18SHoria Geantă #ifdef CONFIG_64BIT 359e44fb18SHoria Geantă extern u64 ioread64(void __iomem *); 369e44fb18SHoria Geantă extern u64 ioread64be(void __iomem *); 379e44fb18SHoria Geantă #endif 381da177e4SLinus Torvalds 39144b2a91SHarvey Harrison extern void iowrite8(u8, void __iomem *); 40144b2a91SHarvey Harrison extern void iowrite16(u16, void __iomem *); 41144b2a91SHarvey Harrison extern void iowrite16be(u16, void __iomem *); 42144b2a91SHarvey Harrison extern void iowrite32(u32, void __iomem *); 43144b2a91SHarvey Harrison extern void iowrite32be(u32, void __iomem *); 449e44fb18SHoria Geantă #ifdef CONFIG_64BIT 459e44fb18SHoria Geantă extern void iowrite64(u64, void __iomem *); 469e44fb18SHoria Geantă extern void iowrite64be(u64, void __iomem *); 479e44fb18SHoria Geantă #endif 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds /* 501da177e4SLinus Torvalds * "string" versions of the above. Note that they 511da177e4SLinus Torvalds * use native byte ordering for the accesses (on 521da177e4SLinus Torvalds * the assumption that IO and memory agree on a 531da177e4SLinus Torvalds * byte order, and CPU byteorder is irrelevant). 541da177e4SLinus Torvalds * 551da177e4SLinus Torvalds * They do _not_ update the port address. If you 561da177e4SLinus Torvalds * want MMIO that copies stuff laid out in MMIO 571da177e4SLinus Torvalds * memory across multiple ports, use "memcpy_toio()" 581da177e4SLinus Torvalds * and friends. 591da177e4SLinus Torvalds */ 60144b2a91SHarvey Harrison extern void ioread8_rep(void __iomem *port, void *buf, unsigned long count); 61144b2a91SHarvey Harrison extern void ioread16_rep(void __iomem *port, void *buf, unsigned long count); 62144b2a91SHarvey Harrison extern void ioread32_rep(void __iomem *port, void *buf, unsigned long count); 631da177e4SLinus Torvalds 64144b2a91SHarvey Harrison extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count); 65144b2a91SHarvey Harrison extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count); 66144b2a91SHarvey Harrison extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count); 671da177e4SLinus Torvalds 68ce816fa8SUwe Kleine-König #ifdef CONFIG_HAS_IOPORT_MAP 691da177e4SLinus Torvalds /* Create a virtual mapping cookie for an IO port range */ 701da177e4SLinus Torvalds extern void __iomem *ioport_map(unsigned long port, unsigned int nr); 711da177e4SLinus Torvalds extern void ioport_unmap(void __iomem *); 7282ed223cSJonas Bonn #endif 731da177e4SLinus Torvalds 741526a756Svenkatesh.pallipadi@intel.com #ifndef ARCH_HAS_IOREMAP_WC 751526a756Svenkatesh.pallipadi@intel.com #define ioremap_wc ioremap_nocache 761526a756Svenkatesh.pallipadi@intel.com #endif 771526a756Svenkatesh.pallipadi@intel.com 78d838270eSToshi Kani #ifndef ARCH_HAS_IOREMAP_WT 79d838270eSToshi Kani #define ioremap_wt ioremap_nocache 80d838270eSToshi Kani #endif 81d838270eSToshi Kani 8282ed223cSJonas Bonn #ifdef CONFIG_PCI 8366eab4dfSMichael S. Tsirkin /* Destroy a virtual mapping cookie for a PCI BAR (memory or IO) */ 841da177e4SLinus Torvalds struct pci_dev; 851da177e4SLinus Torvalds extern void pci_iounmap(struct pci_dev *dev, void __iomem *); 8697a29d59SJames Bottomley #elif defined(CONFIG_GENERIC_IOMAP) 87fea80311SRandy Dunlap struct pci_dev; 88fea80311SRandy Dunlap static inline void pci_iounmap(struct pci_dev *dev, void __iomem *addr) 89fea80311SRandy Dunlap { } 9082ed223cSJonas Bonn #endif 911da177e4SLinus Torvalds 9266eab4dfSMichael S. Tsirkin #include <asm-generic/pci_iomap.h> 9366eab4dfSMichael S. Tsirkin 941da177e4SLinus Torvalds #endif 95