1/*
2 * Copyright 2006 PathScale, Inc.  All Rights Reserved.
3 *
4 * This file is free software; you can redistribute it and/or modify
5 * it under the terms of version 2 of the GNU General Public License
6 * as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software Foundation,
15 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
16 */
17
18#ifndef _LINUX_IO_H
19#define _LINUX_IO_H
20
21#include <linux/types.h>
22#include <asm/io.h>
23#include <asm/page.h>
24
25struct device;
26
27__visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count);
28void __iowrite64_copy(void __iomem *to, const void *from, size_t count);
29
30#ifdef CONFIG_MMU
31int ioremap_page_range(unsigned long addr, unsigned long end,
32		       phys_addr_t phys_addr, pgprot_t prot);
33#else
34static inline int ioremap_page_range(unsigned long addr, unsigned long end,
35				     phys_addr_t phys_addr, pgprot_t prot)
36{
37	return 0;
38}
39#endif
40
41#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
42void __init ioremap_huge_init(void);
43int arch_ioremap_pud_supported(void);
44int arch_ioremap_pmd_supported(void);
45#else
46static inline void ioremap_huge_init(void) { }
47#endif
48
49/*
50 * Managed iomap interface
51 */
52#ifdef CONFIG_HAS_IOPORT_MAP
53void __iomem * devm_ioport_map(struct device *dev, unsigned long port,
54			       unsigned int nr);
55void devm_ioport_unmap(struct device *dev, void __iomem *addr);
56#else
57static inline void __iomem *devm_ioport_map(struct device *dev,
58					     unsigned long port,
59					     unsigned int nr)
60{
61	return NULL;
62}
63
64static inline void devm_ioport_unmap(struct device *dev, void __iomem *addr)
65{
66}
67#endif
68
69#define IOMEM_ERR_PTR(err) (__force void __iomem *)ERR_PTR(err)
70
71void __iomem *devm_ioremap(struct device *dev, resource_size_t offset,
72			   resource_size_t size);
73void __iomem *devm_ioremap_nocache(struct device *dev, resource_size_t offset,
74				   resource_size_t size);
75void __iomem *devm_ioremap_wc(struct device *dev, resource_size_t offset,
76				   resource_size_t size);
77void devm_iounmap(struct device *dev, void __iomem *addr);
78int check_signature(const volatile void __iomem *io_addr,
79			const unsigned char *signature, int length);
80void devm_ioremap_release(struct device *dev, void *res);
81
82/*
83 * Some systems do not have legacy ISA devices.
84 * /dev/port is not a valid interface on these systems.
85 * So for those archs, <asm/io.h> should define the following symbol.
86 */
87#ifndef arch_has_dev_port
88#define arch_has_dev_port()     (1)
89#endif
90
91/*
92 * Some systems (x86 without PAT) have a somewhat reliable way to mark a
93 * physical address range such that uncached mappings will actually
94 * end up write-combining.  This facility should be used in conjunction
95 * with pgprot_writecombine, ioremap-wc, or set_memory_wc, since it has
96 * no effect if the per-page mechanisms are functional.
97 * (On x86 without PAT, these functions manipulate MTRRs.)
98 *
99 * arch_phys_del_wc(0) or arch_phys_del_wc(any error code) is guaranteed
100 * to have no effect.
101 */
102#ifndef arch_phys_wc_add
103static inline int __must_check arch_phys_wc_add(unsigned long base,
104						unsigned long size)
105{
106	return 0;  /* It worked (i.e. did nothing). */
107}
108
109static inline void arch_phys_wc_del(int handle)
110{
111}
112
113#define arch_phys_wc_add arch_phys_wc_add
114#endif
115
116#endif /* _LINUX_IO_H */
117