| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* |
| 2 | * This file is free software; you can redistribute it and/or modify |
| 3 | * it under the terms of version 2 of the GNU General Public License |
| 4 | * as published by the Free Software Foundation. |
| 5 | * |
| 6 | * This program is distributed in the hope that it will be useful, |
| 7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 9 | * GNU General Public License for more details. |
| 10 | * |
| 11 | * You should have received a copy of the GNU General Public License |
| 12 | * along with this program; if not, write to the Free Software Foundation, |
| 13 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/export.h> |
| 17 | #include <linux/io.h> |
| 18 | |
| 19 | /** |
| 20 | * __ioread64_copy - copy data from MMIO space, in 64-bit units |
| 21 | * @to: destination (must be 64-bit aligned) |
| 22 | * @from: source, in MMIO space (must be 64-bit aligned) |
| 23 | * @count: number of 64-bit quantities to copy |
| 24 | * |
| 25 | * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a |
| 26 | * time. Order of access is not guaranteed, nor is a memory barrier |
| 27 | * performed afterwards. |
| 28 | */ |
| 29 | void __ioread64_copy(void *to, const void __iomem *from, size_t count) |
| 30 | { |
| 31 | #ifdef CONFIG_64BIT |
| 32 | u64 *dst = to; |
| 33 | const u64 __iomem *src = from; |
| 34 | const u64 __iomem *end = src + count; |
| 35 | |
| 36 | while (src < end) |
| 37 | *dst++ = __raw_readq(src++); |
| 38 | #else |
| 39 | __ioread32_copy(to, from, count * 2); |
| 40 | #endif |
| 41 | } |
| 42 | EXPORT_SYMBOL_GPL(__ioread64_copy); |