io.h (5340B)
1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright 2006 PathScale, Inc. All Rights Reserved. 4 */ 5 6#ifndef _LINUX_IO_H 7#define _LINUX_IO_H 8 9#include <linux/types.h> 10#include <linux/init.h> 11#include <linux/bug.h> 12#include <linux/err.h> 13#include <asm/io.h> 14#include <asm/page.h> 15 16struct device; 17struct resource; 18 19__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); 20void __ioread32_copy(void *to, const void __iomem *from, size_t count); 21void __iowrite64_copy(void __iomem *to, const void *from, size_t count); 22 23#ifdef CONFIG_MMU 24int ioremap_page_range(unsigned long addr, unsigned long end, 25 phys_addr_t phys_addr, pgprot_t prot); 26#else 27static inline int ioremap_page_range(unsigned long addr, unsigned long end, 28 phys_addr_t phys_addr, pgprot_t prot) 29{ 30 return 0; 31} 32#endif 33 34/* 35 * Managed iomap interface 36 */ 37#ifdef CONFIG_HAS_IOPORT_MAP 38void __iomem * devm_ioport_map(struct device *dev, unsigned long port, 39 unsigned int nr); 40void devm_ioport_unmap(struct device *dev, void __iomem *addr); 41#else 42static inline void __iomem *devm_ioport_map(struct device *dev, 43 unsigned long port, 44 unsigned int nr) 45{ 46 return NULL; 47} 48 49static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) 50{ 51} 52#endif 53 54#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err) 55 56void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, 57 resource_size_t size); 58void __iomem *devm_ioremap_uc(struct device *dev, resource_size_t offset, 59 resource_size_t size); 60void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, 61 resource_size_t size); 62void __iomem *devm_ioremap_np(struct device *dev, resource_size_t offset, 63 resource_size_t size); 64void devm_iounmap(struct device *dev, void __iomem *addr); 65int check_signature(const volatile void __iomem *io_addr, 66 const unsigned char *signature, int length); 67void devm_ioremap_release(struct device *dev, void *res); 68 69void *devm_memremap(struct device *dev, resource_size_t offset, 70 size_t size, unsigned long flags); 71void devm_memunmap(struct device *dev, void *addr); 72 73#ifdef CONFIG_PCI 74/* 75 * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and 76 * Posting") mandate non-posted configuration transactions. This default 77 * implementation attempts to use the ioremap_np() API to provide this 78 * on arches that support it, and falls back to ioremap() on those that 79 * don't. Overriding this function is deprecated; arches that properly 80 * support non-posted accesses should implement ioremap_np() instead, which 81 * this default implementation can then use to return mappings compliant with 82 * the PCI specification. 83 */ 84#ifndef pci_remap_cfgspace 85#define pci_remap_cfgspace pci_remap_cfgspace 86static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset, 87 size_t size) 88{ 89 return ioremap_np(offset, size) ?: ioremap(offset, size); 90} 91#endif 92#endif 93 94/* 95 * Some systems do not have legacy ISA devices. 96 * /dev/port is not a valid interface on these systems. 97 * So for those archs, <asm/io.h> should define the following symbol. 98 */ 99#ifndef arch_has_dev_port 100#define arch_has_dev_port() (1) 101#endif 102 103/* 104 * Some systems (x86 without PAT) have a somewhat reliable way to mark a 105 * physical address range such that uncached mappings will actually 106 * end up write-combining. This facility should be used in conjunction 107 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has 108 * no effect if the per-page mechanisms are functional. 109 * (On x86 without PAT, these functions manipulate MTRRs.) 110 * 111 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed 112 * to have no effect. 113 */ 114#ifndef arch_phys_wc_add 115static inline int __must_check arch_phys_wc_add(unsigned long base, 116 unsigned long size) 117{ 118 return 0; /* It worked (i.e. did nothing). */ 119} 120 121static inline void arch_phys_wc_del(int handle) 122{ 123} 124 125#define arch_phys_wc_add arch_phys_wc_add 126#ifndef arch_phys_wc_index 127static inline int arch_phys_wc_index(int handle) 128{ 129 return -1; 130} 131#define arch_phys_wc_index arch_phys_wc_index 132#endif 133#endif 134 135int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size); 136 137enum { 138 /* See memremap() kernel-doc for usage description... */ 139 MEMREMAP_WB = 1 << 0, 140 MEMREMAP_WT = 1 << 1, 141 MEMREMAP_WC = 1 << 2, 142 MEMREMAP_ENC = 1 << 3, 143 MEMREMAP_DEC = 1 << 4, 144}; 145 146void *memremap(resource_size_t offset, size_t size, unsigned long flags); 147void memunmap(void *addr); 148 149/* 150 * On x86 PAT systems we have memory tracking that keeps track of 151 * the allowed mappings on memory ranges. This tracking works for 152 * all the in-kernel mapping APIs (ioremap*), but where the user 153 * wishes to map a range from a physical device into user memory 154 * the tracking won't be updated. This API is to be used by 155 * drivers which remap physical device pages into userspace, 156 * and wants to make sure they are mapped WC and not UC. 157 */ 158#ifndef arch_io_reserve_memtype_wc 159static inline int arch_io_reserve_memtype_wc(resource_size_t base, 160 resource_size_t size) 161{ 162 return 0; 163} 164 165static inline void arch_io_free_memtype_wc(resource_size_t base, 166 resource_size_t size) 167{ 168} 169#endif 170 171int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start, 172 resource_size_t size); 173 174#endif /* _LINUX_IO_H */