iomap.h (4019B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __GENERIC_IO_H 3#define __GENERIC_IO_H 4 5#include <linux/linkage.h> 6#include <asm/byteorder.h> 7 8/* 9 * These are the "generic" interfaces for doing new-style 10 * memory-mapped or PIO accesses. Architectures may do 11 * their own arch-optimized versions, these just act as 12 * wrappers around the old-style IO register access functions: 13 * read[bwl]/write[bwl]/in[bwl]/out[bwl] 14 * 15 * Don't include this directly, include it from <asm/io.h>. 16 */ 17 18/* 19 * Read/write from/to an (offsettable) iomem cookie. It might be a PIO 20 * access or a MMIO access, these functions don't care. The info is 21 * encoded in the hardware mapping set up by the mapping functions 22 * (or the cookie itself, depending on implementation and hw). 23 * 24 * The generic routines just encode the PIO/MMIO as part of the 25 * cookie, and coldly assume that the MMIO IO mappings are not 26 * in the low address range. Architectures for which this is not 27 * true can't use this generic implementation. 28 */ 29extern unsigned int ioread8(const void __iomem *); 30extern unsigned int ioread16(const void __iomem *); 31extern unsigned int ioread16be(const void __iomem *); 32extern unsigned int ioread32(const void __iomem *); 33extern unsigned int ioread32be(const void __iomem *); 34#ifdef CONFIG_64BIT 35extern u64 ioread64(const void __iomem *); 36extern u64 ioread64be(const void __iomem *); 37#endif 38 39#ifdef readq 40#define ioread64_lo_hi ioread64_lo_hi 41#define ioread64_hi_lo ioread64_hi_lo 42#define ioread64be_lo_hi ioread64be_lo_hi 43#define ioread64be_hi_lo ioread64be_hi_lo 44extern u64 ioread64_lo_hi(const void __iomem *addr); 45extern u64 ioread64_hi_lo(const void __iomem *addr); 46extern u64 ioread64be_lo_hi(const void __iomem *addr); 47extern u64 ioread64be_hi_lo(const void __iomem *addr); 48#endif 49 50extern void iowrite8(u8, void __iomem *); 51extern void iowrite16(u16, void __iomem *); 52extern void iowrite16be(u16, void __iomem *); 53extern void iowrite32(u32, void __iomem *); 54extern void iowrite32be(u32, void __iomem *); 55#ifdef CONFIG_64BIT 56extern void iowrite64(u64, void __iomem *); 57extern void iowrite64be(u64, void __iomem *); 58#endif 59 60#ifdef writeq 61#define iowrite64_lo_hi iowrite64_lo_hi 62#define iowrite64_hi_lo iowrite64_hi_lo 63#define iowrite64be_lo_hi iowrite64be_lo_hi 64#define iowrite64be_hi_lo iowrite64be_hi_lo 65extern void iowrite64_lo_hi(u64 val, void __iomem *addr); 66extern void iowrite64_hi_lo(u64 val, void __iomem *addr); 67extern void iowrite64be_lo_hi(u64 val, void __iomem *addr); 68extern void iowrite64be_hi_lo(u64 val, void __iomem *addr); 69#endif 70 71/* 72 * "string" versions of the above. Note that they 73 * use native byte ordering for the accesses (on 74 * the assumption that IO and memory agree on a 75 * byte order, and CPU byteorder is irrelevant). 76 * 77 * They do _not_ update the port address. If you 78 * want MMIO that copies stuff laid out in MMIO 79 * memory across multiple ports, use "memcpy_toio()" 80 * and friends. 81 */ 82extern void ioread8_rep(const void __iomem *port, void *buf, unsigned long count); 83extern void ioread16_rep(const void __iomem *port, void *buf, unsigned long count); 84extern void ioread32_rep(const void __iomem *port, void *buf, unsigned long count); 85 86extern void iowrite8_rep(void __iomem *port, const void *buf, unsigned long count); 87extern void iowrite16_rep(void __iomem *port, const void *buf, unsigned long count); 88extern void iowrite32_rep(void __iomem *port, const void *buf, unsigned long count); 89 90#ifdef CONFIG_HAS_IOPORT_MAP 91/* Create a virtual mapping cookie for an IO port range */ 92extern void __iomem *ioport_map(unsigned long port, unsigned int nr); 93extern void ioport_unmap(void __iomem *); 94#endif 95 96#ifndef ARCH_HAS_IOREMAP_WC 97#define ioremap_wc ioremap 98#endif 99 100#ifndef ARCH_HAS_IOREMAP_WT 101#define ioremap_wt ioremap 102#endif 103 104#ifndef ARCH_HAS_IOREMAP_NP 105/* See the comment in asm-generic/io.h about ioremap_np(). */ 106#define ioremap_np ioremap_np 107static inline void __iomem *ioremap_np(phys_addr_t offset, size_t size) 108{ 109 return NULL; 110} 111#endif 112 113#include <asm-generic/pci_iomap.h> 114 115#endif