| 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 <linux/export.h> |
| 24 | #include <linux/io.h> |
| 25 | #include <linux/uaccess.h> |
| 26 | #include <sound/core.h> |
| 27 | |
| 28 | /** |
| 29 | * copy_to_user_fromio - copy data from mmio-space to user-space |
| 30 | * @dst: the destination pointer on user-space |
| 31 | * @src: the source pointer on mmio |
| 32 | * @count: the data size to copy in bytes |
| 33 | * |
| 34 | * Copies the data from mmio-space to user-space. |
| 35 | * |
| 36 | * Return: Zero if successful, or non-zero on failure. |
| 37 | */ |
| 38 | int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count) |
| 39 | { |
| 40 | #if defined(__i386__) || defined(CONFIG_SPARC32) |
| 41 | return copy_to_user(dst, (const void __force*)src, count) ? -EFAULT : 0; |
| 42 | #else |
| 43 | char buf[256]; |
| 44 | while (count) { |
| 45 | size_t c = count; |
| 46 | if (c > sizeof(buf)) |
| 47 | c = sizeof(buf); |
| 48 | memcpy_fromio(buf, (void __iomem *)src, c); |
| 49 | if (copy_to_user(dst, buf, c)) |
| 50 | return -EFAULT; |
| 51 | count -= c; |
| 52 | dst += c; |
| 53 | src += c; |
| 54 | } |
| 55 | return 0; |
| 56 | #endif |
| 57 | } |
| 58 | |
| 59 | EXPORT_SYMBOL(copy_to_user_fromio); |
| 60 | |
| 61 | /** |
| 62 | * copy_from_user_toio - copy data from user-space to mmio-space |
| 63 | * @dst: the destination pointer on mmio-space |
| 64 | * @src: the source pointer on user-space |
| 65 | * @count: the data size to copy in bytes |
| 66 | * |
| 67 | * Copies the data from user-space to mmio-space. |
| 68 | * |
| 69 | * Return: Zero if successful, or non-zero on failure. |
| 70 | */ |
| 71 | int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count) |
| 72 | { |
| 73 | #if defined(__i386__) || defined(CONFIG_SPARC32) |
| 74 | return copy_from_user((void __force *)dst, src, count) ? -EFAULT : 0; |
| 75 | #else |
| 76 | char buf[256]; |
| 77 | while (count) { |
| 78 | size_t c = count; |
| 79 | if (c > sizeof(buf)) |
| 80 | c = sizeof(buf); |
| 81 | if (copy_from_user(buf, src, c)) |
| 82 | return -EFAULT; |
| 83 | memcpy_toio(dst, buf, c); |
| 84 | count -= c; |
| 85 | dst += c; |
| 86 | src += c; |
| 87 | } |
| 88 | return 0; |
| 89 | #endif |
| 90 | } |
| 91 | |
| 92 | EXPORT_SYMBOL(copy_from_user_toio); |