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>
 
 6#include <linux/io.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 7
 8pgprot_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(vma_prot);
15	}
16
17	return vma_prot;
18}
19EXPORT_SYMBOL(phys_mem_access_prot);

 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>
 6#include <linux/vmalloc.h>
 7#include <linux/io.h>
 8
 9#include <asm/pgtable.h>
10
11static void __iomem *__ioremap_caller(phys_addr_t addr, size_t size,
12				      pgprot_t prot, void *caller)
13{
14	phys_addr_t last_addr;
15	unsigned long offset, vaddr;
16	struct vm_struct *area;
17
18	last_addr = addr + size - 1;
19	if (!size || last_addr < addr)
20		return NULL;
21
22	offset = addr & (~PAGE_MASK);
23	addr &= PAGE_MASK;
24	size = PAGE_ALIGN(size + offset);
25
26	area = get_vm_area_caller(size, VM_IOREMAP, caller);
27	if (!area)
28		return NULL;
29
30	vaddr = (unsigned long)area->addr;
31
32	if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) {
33		free_vm_area(area);
34		return NULL;
35	}
36
37	return (void __iomem *)(vaddr + offset);
38}
39
40void __iomem *__ioremap(phys_addr_t phys_addr, size_t size, pgprot_t prot)
41{
42	return __ioremap_caller(phys_addr, size, prot,
43				__builtin_return_address(0));
44}
45EXPORT_SYMBOL(__ioremap);
46
47void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size)
48{
49	return __ioremap_caller(phys_addr, size, PAGE_KERNEL,
50				__builtin_return_address(0));
51}
52EXPORT_SYMBOL(ioremap_cache);
53
54void iounmap(void __iomem *addr)
55{
56	vunmap((void *)((unsigned long)addr & PAGE_MASK));
57}
58EXPORT_SYMBOL(iounmap);
59
60pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
61			      unsigned long size, pgprot_t vma_prot)
62{
63	if (!pfn_valid(pfn)) {
64		return pgprot_noncached(vma_prot);
65	} else if (file->f_flags & O_SYNC) {
66		return pgprot_writecombine(vma_prot);
67	}
68
69	return vma_prot;
70}
71EXPORT_SYMBOL(phys_mem_access_prot);