1 /* 2 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 3 * 4 * Misc memory accessors 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23 #include <asm/io.h> 24 #include <asm/uaccess.h> 25 #include <sound/core.h> 26 27 /** 28 * copy_to_user_fromio - copy data from mmio-space to user-space 29 * @dst: the destination pointer on user-space 30 * @src: the source pointer on mmio 31 * @count: the data size to copy in bytes 32 * 33 * Copies the data from mmio-space to user-space. 34 * 35 * Returns zero if successful, or non-zero on failure. 36 */ 37 int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count) 38 { 39 #if defined(__i386__) || defined(CONFIG_SPARC32) 40 return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; 41 #else 42 char buf[256]; 43 while (count) { 44 size_t c = count; 45 if (c > sizeof(buf)) 46 c = sizeof(buf); 47 memcpy_fromio(buf, (void __iomem *)src, c); 48 if (copy_to_user(dst, buf, c)) 49 return -EFAULT; 50 count -= c; 51 dst += c; 52 src += c; 53 } 54 return 0; 55 #endif 56 } 57 58 EXPORT_SYMBOL(copy_to_user_fromio); 59 60 /** 61 * copy_from_user_toio - copy data from user-space to mmio-space 62 * @dst: the destination pointer on mmio-space 63 * @src: the source pointer on user-space 64 * @count: the data size to copy in bytes 65 * 66 * Copies the data from user-space to mmio-space. 67 * 68 * Returns zero if successful, or non-zero on failure. 69 */ 70 int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count) 71 { 72 #if defined(__i386__) || defined(CONFIG_SPARC32) 73 return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; 74 #else 75 char buf[256]; 76 while (count) { 77 size_t c = count; 78 if (c > sizeof(buf)) 79 c = sizeof(buf); 80 if (copy_from_user(buf, src, c)) 81 return -EFAULT; 82 memcpy_toio(dst, buf, c); 83 count -= c; 84 dst += c; 85 src += c; 86 } 87 return 0; 88 #endif 89 } 90 91 EXPORT_SYMBOL(copy_from_user_toio); 92