| Guo Ren | 013de2d | 2018-09-05 14:25:12 +0800 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
| 3 | |
| 4 | #include <linux/export.h> |
| 5 | #include <linux/mm.h> |
| Guo Ren | 013de2d | 2018-09-05 14:25:12 +0800 | [diff] [blame] | 6 | #include <linux/io.h> |
| 7 | |
| Guo Ren | 76d21d1 | 2019-01-30 20:13:11 +0800 | [diff] [blame] | 8 | pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, |
| 9 | unsigned long size, pgprot_t vma_prot) |
| 10 | { |
| 11 | if (!pfn_valid(pfn)) { |
| Guo Ren | 76d21d1 | 2019-01-30 20:13:11 +0800 | [diff] [blame] | 12 | return pgprot_noncached(vma_prot); |
| 13 | } else if (file->f_flags & O_SYNC) { |
| Guo Ren | 7f80fe2 | 2019-07-30 14:43:22 +0800 | [diff] [blame] | 14 | return pgprot_writecombine(vma_prot); |
| Guo Ren | 76d21d1 | 2019-01-30 20:13:11 +0800 | [diff] [blame] | 15 | } |
| 16 | |
| 17 | return vma_prot; |
| 18 | } |
| 19 | EXPORT_SYMBOL(phys_mem_access_prot); |