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 /* 94 * Some systems do not have legacy ISA devices. 95 * /dev/port is not a valid interface on these systems. 96 * So for those archs, <asm/io.h> should define the following symbol. 97 */ 98 #ifndef arch_has_dev_port 99 #define arch_has_dev_port() (1) 100 #endif 101 102 /* 103 * Some systems (x86 without PAT) have a somewhat reliable way to mark a 104 * physical address range such that uncached mappings will actually 105 * end up write-combining. This facility should be used in conjunction 106 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has 107 * no effect if the per-page mechanisms are functional. 108 * (On x86 without PAT, these functions manipulate MTRRs.) 109 * 110 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed 111 * to have no effect. 112 */ 113 #ifndef arch_phys_wc_add 114 static inline int __must_check arch_phys_wc_add(unsigned long base, 115 unsigned long size) 116 { 117 return 0; /* It worked (i.e. did nothing). */ 118 } 119 120 static inline void arch_phys_wc_del(int handle) 121 { 122 } 123 124 #define arch_phys_wc_add arch_phys_wc_add 125 #ifndef arch_phys_wc_index 126 static inline int arch_phys_wc_index(int handle) 127 { 128 return -1; 129 } 130 #define arch_phys_wc_index arch_phys_wc_index 131 #endif 132 #endif 133 134 enum { 135 /* See memremap() kernel-doc for usage description... */ 136 MEMREMAP_WB = 1 << 0, 137 MEMREMAP_WT = 1 << 1, 138 MEMREMAP_WC = 1 << 2, 139 }; 140 141 void *memremap(resource_size_t offset, size_t size, unsigned long flags); 142 void memunmap(void *addr); 143 144 #endif /* _LINUX_IO_H */ 145