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 <asm/io.h> 24 #include <asm/page.h> 25 26 struct device; 27 28 __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); 29 void __iowrite64_copy(void __iomem *to, const void *from, size_t count); 30 31 #ifdef CONFIG_MMU 32 int ioremap_page_range(unsigned long addr, unsigned long end, 33 phys_addr_t phys_addr, pgprot_t prot); 34 #else 35 static inline int ioremap_page_range(unsigned long addr, unsigned long end, 36 phys_addr_t phys_addr, pgprot_t prot) 37 { 38 return 0; 39 } 40 #endif 41 42 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP 43 void __init ioremap_huge_init(void); 44 int arch_ioremap_pud_supported(void); 45 int arch_ioremap_pmd_supported(void); 46 #else 47 static inline void ioremap_huge_init(void) { } 48 #endif 49 50 /* 51 * Managed iomap interface 52 */ 53 #ifdef CONFIG_HAS_IOPORT_MAP 54 void __iomem * devm_ioport_map(struct device *dev, unsigned long port, 55 unsigned int nr); 56 void devm_ioport_unmap(struct device *dev, void __iomem *addr); 57 #else 58 static inline void __iomem *devm_ioport_map(struct device *dev, 59 unsigned long port, 60 unsigned int nr) 61 { 62 return NULL; 63 } 64 65 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) 66 { 67 } 68 #endif 69 70 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err) 71 72 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, 73 resource_size_t size); 74 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, 75 resource_size_t size); 76 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, 77 resource_size_t size); 78 void devm_iounmap(struct device *dev, void __iomem *addr); 79 int check_signature(const volatile void __iomem *io_addr, 80 const unsigned char *signature, int length); 81 void devm_ioremap_release(struct device *dev, void *res); 82 83 /* 84 * Some systems do not have legacy ISA devices. 85 * /dev/port is not a valid interface on these systems. 86 * So for those archs, <asm/io.h> should define the following symbol. 87 */ 88 #ifndef arch_has_dev_port 89 #define arch_has_dev_port() (1) 90 #endif 91 92 /* 93 * Some systems (x86 without PAT) have a somewhat reliable way to mark a 94 * physical address range such that uncached mappings will actually 95 * end up write-combining. This facility should be used in conjunction 96 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has 97 * no effect if the per-page mechanisms are functional. 98 * (On x86 without PAT, these functions manipulate MTRRs.) 99 * 100 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed 101 * to have no effect. 102 */ 103 #ifndef arch_phys_wc_add 104 static inline int __must_check arch_phys_wc_add(unsigned long base, 105 unsigned long size) 106 { 107 return 0; /* It worked (i.e. did nothing). */ 108 } 109 110 static inline void arch_phys_wc_del(int handle) 111 { 112 } 113 114 #define arch_phys_wc_add arch_phys_wc_add 115 #ifndef arch_phys_wc_index 116 static inline int arch_phys_wc_index(int handle) 117 { 118 return -1; 119 } 120 #define arch_phys_wc_index arch_phys_wc_index 121 #endif 122 #endif 123 124 #endif /* _LINUX_IO_H */ 125