1 /* 2 * Copyright 2006 PathScale, Inc. All Rights Reserved. 3 * 4 * This file is free software; you can redistribute it and/or modify 5 * it under the terms of version 2 of the GNU General Public License 6 * as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 * 13 * You should have received a copy of the GNU General Public License 14 * along with this program; if not, write to the Free Software Foundation, 15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. 16 */ 17 18 #ifndef _LINUX_IO_H 19 #define _LINUX_IO_H 20 21 #include <linux/types.h> 22 #include <linux/init.h> 23 #include <linux/bug.h> 24 #include <linux/err.h> 25 #include <asm/io.h> 26 #include <asm/page.h> 27 28 struct device; 29 struct resource; 30 31 __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); 32 void __ioread32_copy(void *to, const void __iomem *from, size_t count); 33 void __iowrite64_copy(void __iomem *to, const void *from, size_t count); 34 35 #ifdef CONFIG_MMU 36 int ioremap_page_range(unsigned long addr, unsigned long end, 37 phys_addr_t phys_addr, pgprot_t prot); 38 #else 39 static inline int ioremap_page_range(unsigned long addr, unsigned long end, 40 phys_addr_t phys_addr, pgprot_t prot) 41 { 42 return 0; 43 } 44 #endif 45 46 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP 47 void __init ioremap_huge_init(void); 48 int arch_ioremap_pud_supported(void); 49 int arch_ioremap_pmd_supported(void); 50 #else 51 static inline void ioremap_huge_init(void) { } 52 #endif 53 54 /* 55 * Managed iomap interface 56 */ 57 #ifdef CONFIG_HAS_IOPORT_MAP 58 void __iomem * devm_ioport_map(struct device *dev, unsigned long port, 59 unsigned int nr); 60 void devm_ioport_unmap(struct device *dev, void __iomem *addr); 61 #else 62 static inline void __iomem *devm_ioport_map(struct device *dev, 63 unsigned long port, 64 unsigned int nr) 65 { 66 return NULL; 67 } 68 69 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) 70 { 71 } 72 #endif 73 74 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err) 75 76 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, 77 resource_size_t size); 78 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, 79 resource_size_t size); 80 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, 81 resource_size_t size); 82 void devm_iounmap(struct device *dev, void __iomem *addr); 83 int check_signature(const volatile void __iomem *io_addr, 84 const unsigned char *signature, int length); 85 void devm_ioremap_release(struct device *dev, void *res); 86 87 void *devm_memremap(struct device *dev, resource_size_t offset, 88 size_t size, unsigned long flags); 89 void devm_memunmap(struct device *dev, void *addr); 90 91 void *__devm_memremap_pages(struct device *dev, struct resource *res); 92 93 #ifdef CONFIG_PCI 94 /* 95 * The PCI specifications (Rev 3.0, 3.2.5 "Transaction Ordering and 96 * Posting") mandate non-posted configuration transactions. There is 97 * no ioremap API in the kernel that can guarantee non-posted write 98 * semantics across arches so provide a default implementation for 99 * mapping PCI config space that defaults to ioremap_nocache(); arches 100 * should override it if they have memory mapping implementations that 101 * guarantee non-posted writes semantics to make the memory mapping 102 * compliant with the PCI specification. 103 */ 104 #ifndef pci_remap_cfgspace 105 #define pci_remap_cfgspace pci_remap_cfgspace 106 static inline void __iomem *pci_remap_cfgspace(phys_addr_t offset, 107 size_t size) 108 { 109 return ioremap_nocache(offset, size); 110 } 111 #endif 112 #endif 113 114 /* 115 * Some systems do not have legacy ISA devices. 116 * /dev/port is not a valid interface on these systems. 117 * So for those archs, <asm/io.h> should define the following symbol. 118 */ 119 #ifndef arch_has_dev_port 120 #define arch_has_dev_port() (1) 121 #endif 122 123 /* 124 * Some systems (x86 without PAT) have a somewhat reliable way to mark a 125 * physical address range such that uncached mappings will actually 126 * end up write-combining. This facility should be used in conjunction 127 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has 128 * no effect if the per-page mechanisms are functional. 129 * (On x86 without PAT, these functions manipulate MTRRs.) 130 * 131 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed 132 * to have no effect. 133 */ 134 #ifndef arch_phys_wc_add 135 static inline int __must_check arch_phys_wc_add(unsigned long base, 136 unsigned long size) 137 { 138 return 0; /* It worked (i.e. did nothing). */ 139 } 140 141 static inline void arch_phys_wc_del(int handle) 142 { 143 } 144 145 #define arch_phys_wc_add arch_phys_wc_add 146 #ifndef arch_phys_wc_index 147 static inline int arch_phys_wc_index(int handle) 148 { 149 return -1; 150 } 151 #define arch_phys_wc_index arch_phys_wc_index 152 #endif 153 #endif 154 155 enum { 156 /* See memremap() kernel-doc for usage description... */ 157 MEMREMAP_WB = 1 << 0, 158 MEMREMAP_WT = 1 << 1, 159 MEMREMAP_WC = 1 << 2, 160 }; 161 162 void *memremap(resource_size_t offset, size_t size, unsigned long flags); 163 void memunmap(void *addr); 164 165 /* 166 * On x86 PAT systems we have memory tracking that keeps track of 167 * the allowed mappings on memory ranges. This tracking works for 168 * all the in-kernel mapping APIs (ioremap*), but where the user 169 * wishes to map a range from a physical device into user memory 170 * the tracking won't be updated. This API is to be used by 171 * drivers which remap physical device pages into userspace, 172 * and wants to make sure they are mapped WC and not UC. 173 */ 174 #ifndef arch_io_reserve_memtype_wc 175 static inline int arch_io_reserve_memtype_wc(resource_size_t base, 176 resource_size_t size) 177 { 178 return 0; 179 } 180 181 static inline void arch_io_free_memtype_wc(resource_size_t base, 182 resource_size_t size) 183 { 184 } 185 #endif 186 187 #endif /* _LINUX_IO_H */ 188