csky/mm/ioremap.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
0003
0004 #include <linux/export.h>
0005 #include <linux/mm.h>
0006 #include <linux/io.h>
0007
0008 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
0009                   unsigned long size, pgprot_t vma_prot)
0010 {
0011     if (!pfn_valid(pfn)) {
0012         return pgprot_noncached(vma_prot);
0013     } else if (file->f_flags & O_SYNC) {
0014         return pgprot_writecombine(vma_prot);
0015     }
0016
0017     return vma_prot;
0018 }
0019 EXPORT_SYMBOL(phys_mem_access_prot);