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