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 <asm/io.h> 23 #include <asm/page.h> 24 25 struct device; 26 27 __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); 28 void __iowrite64_copy(void __iomem *to, const void *from, size_t count); 29 30 #ifdef CONFIG_MMU 31 int ioremap_page_range(unsigned long addr, unsigned long end, 32 phys_addr_t phys_addr, pgprot_t prot); 33 #else 34 static inline int ioremap_page_range(unsigned long addr, unsigned long end, 35 phys_addr_t phys_addr, pgprot_t prot) 36 { 37 return 0; 38 } 39 #endif 40 41 #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP 42 void __init ioremap_huge_init(void); 43 int arch_ioremap_pud_supported(void); 44 int arch_ioremap_pmd_supported(void); 45 #else 46 static inline void ioremap_huge_init(void) { } 47 #endif 48 49 /* 50 * Managed iomap interface 51 */ 52 #ifdef CONFIG_HAS_IOPORT_MAP 53 void __iomem * devm_ioport_map(struct device *dev, unsigned long port, 54 unsigned int nr); 55 void devm_ioport_unmap(struct device *dev, void __iomem *addr); 56 #else 57 static inline void __iomem *devm_ioport_map(struct device *dev, 58 unsigned long port, 59 unsigned int nr) 60 { 61 return NULL; 62 } 63 64 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) 65 { 66 } 67 #endif 68 69 #define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err) 70 71 void __iomem *devm_ioremap(struct device *dev, resource_size_t offset, 72 resource_size_t size); 73 void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset, 74 resource_size_t size); 75 void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset, 76 resource_size_t size); 77 void devm_iounmap(struct device *dev, void __iomem *addr); 78 int check_signature(const volatile void __iomem *io_addr, 79 const unsigned char *signature, int length); 80 void devm_ioremap_release(struct device *dev, void *res); 81 82 /* 83 * Some systems do not have legacy ISA devices. 84 * /dev/port is not a valid interface on these systems. 85 * So for those archs, <asm/io.h> should define the following symbol. 86 */ 87 #ifndef arch_has_dev_port 88 #define arch_has_dev_port() (1) 89 #endif 90 91 /* 92 * Some systems (x86 without PAT) have a somewhat reliable way to mark a 93 * physical address range such that uncached mappings will actually 94 * end up write-combining. This facility should be used in conjunction 95 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has 96 * no effect if the per-page mechanisms are functional. 97 * (On x86 without PAT, these functions manipulate MTRRs.) 98 * 99 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed 100 * to have no effect. 101 */ 102 #ifndef arch_phys_wc_add 103 static inline int __must_check arch_phys_wc_add(unsigned long base, 104 unsigned long size) 105 { 106 return 0; /* It worked (i.e. did nothing). */ 107 } 108 109 static inline void arch_phys_wc_del(int handle) 110 { 111 } 112 113 #define arch_phys_wc_add arch_phys_wc_add 114 #endif 115 116 #endif /* _LINUX_IO_H */ 117