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 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 unsigned long phys_addr, pgprot_t prot); 33 #else 34 static inline int ioremap_page_range(unsigned long addr, unsigned long end, 35 unsigned long phys_addr, pgprot_t prot) 36 { 37 return 0; 38 } 39 #endif 40 41 /* 42 * Managed iomap interface 43 */ 44 #ifdef CONFIG_HAS_IOPORT 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 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 56 static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr) 57 { 58 } 59 #endif 60 61 void __iomem * devm_ioremap(struct device *dev, unsigned long offset, 62 unsigned long size); 63 void __iomem * devm_ioremap_nocache(struct device *dev, unsigned long offset, 64 unsigned long size); 65 void devm_iounmap(struct device *dev, void __iomem *addr); 66 67 /** 68 * check_signature - find BIOS signatures 69 * @io_addr: mmio address to check 70 * @signature: signature block 71 * @length: length of signature 72 * 73 * Perform a signature comparison with the mmio address io_addr. This 74 * address should have been obtained by ioremap. 75 * Returns 1 on a match. 76 */ 77 78 static inline int check_signature(const volatile void __iomem *io_addr, 79 const unsigned char *signature, int length) 80 { 81 int retval = 0; 82 do { 83 if (readb(io_addr) != *signature) 84 goto out; 85 io_addr++; 86 signature++; 87 length--; 88 } while (length); 89 retval = 1; 90 out: 91 return retval; 92 } 93 94 #endif /* _LINUX_IO_H */ 95