1 | // SPDX-License-Identifier: GPL-2.0 |
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2 | // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. |
3 | |
4 | #include <linux/export.h> |
5 | #include <linux/mm.h> |
6 | #include <linux/io.h> |
7 | |
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)) { |
12 | return pgprot_noncached(vma_prot); |
13 | } else if (file->f_flags & O_SYNC) { |
14 | return pgprot_writecombine(prot: vma_prot); |
15 | } |
16 | |
17 | return vma_prot; |
18 | } |
19 | EXPORT_SYMBOL(phys_mem_access_prot); |
20 |