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 1/*
 2 * ioremap implementation.
 3 *
 4 * Copyright (C) 2015 Cadence Design Systems Inc.
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 as
 8 * published by the Free Software Foundation.
 9 */
10
11#include <linux/io.h>
12#include <linux/vmalloc.h>
13#include <asm/cacheflush.h>
14#include <asm/io.h>
15#include <asm/pgtable.h>
16
17static void __iomem *xtensa_ioremap(unsigned long paddr, unsigned long size,
18				    pgprot_t prot)
19{
20	unsigned long offset = paddr & ~PAGE_MASK;
21	unsigned long pfn = __phys_to_pfn(paddr);
22	struct vm_struct *area;
23	unsigned long vaddr;
24	int err;
25
26	paddr &= PAGE_MASK;
27
28	WARN_ON(pfn_valid(pfn));
29
30	size = PAGE_ALIGN(offset + size);
31
32	area = get_vm_area(size, VM_IOREMAP);
33	if (!area)
34		return NULL;
35
36	vaddr = (unsigned long)area->addr;
37	area->phys_addr = paddr;
38
39	err = ioremap_page_range(vaddr, vaddr + size, paddr, prot);
40
41	if (err) {
42		vunmap((void *)vaddr);
43		return NULL;
44	}
45
46	flush_cache_vmap(vaddr, vaddr + size);
47	return (void __iomem *)(offset + vaddr);
48}
49
50void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size)
51{
52	return xtensa_ioremap(addr, size, pgprot_noncached(PAGE_KERNEL));
53}
54EXPORT_SYMBOL(xtensa_ioremap_nocache);
55
56void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size)
57{
58	return xtensa_ioremap(addr, size, PAGE_KERNEL);
59}
60EXPORT_SYMBOL(xtensa_ioremap_cache);
61
62void xtensa_iounmap(volatile void __iomem *io_addr)
63{
64	void *addr = (void *)(PAGE_MASK & (unsigned long)io_addr);
65
66	vunmap(addr);
67}
68EXPORT_SYMBOL(xtensa_iounmap);