1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * I/O remap functions for Hexagon
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8#include <linux/io.h>
9#include <linux/vmalloc.h>
10#include <linux/mm.h>
11
12void __iomem *ioremap(unsigned long phys_addr, unsigned long size)
13{
14	unsigned long last_addr, addr;
15	unsigned long offset = phys_addr & ~PAGE_MASK;
16	struct vm_struct *area;
17
18	pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE
19					|(__HEXAGON_C_DEV << 6));
20
21	last_addr = phys_addr + size - 1;
22
23	/*  Wrapping not allowed  */
24	if (!size || (last_addr < phys_addr))
25		return NULL;
26
27	/*  Rounds up to next page size, including whole-page offset */
28	size = PAGE_ALIGN(offset + size);
29
30	area = get_vm_area(size, VM_IOREMAP);
31	addr = (unsigned long)area->addr;
32
33	if (ioremap_page_range(addr, addr+size, phys_addr, prot)) {
34		vunmap((void *)addr);
35		return NULL;
36	}
37
38	return (void __iomem *) (offset + addr);
39}
40
41void iounmap(const volatile void __iomem *addr)
42{
43	vunmap((void *) ((unsigned long) addr & PAGE_MASK));
44}
45