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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * IO definitions for the Hexagon architecture
4 *
5 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
6 */
7
8#ifndef _ASM_IO_H
9#define _ASM_IO_H
10
11#include <linux/types.h>
12#include <asm/page.h>
13#include <asm/cacheflush.h>
14
15extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
16 unsigned long end, unsigned long flags);
17
18/*
19 * virt_to_phys - map virtual address to physical
20 * @address: address to map
21 */
22static inline unsigned long virt_to_phys(volatile void *address)
23{
24 return __pa(address);
25}
26
27/*
28 * phys_to_virt - map physical address to virtual
29 * @address: address to map
30 */
31static inline void *phys_to_virt(unsigned long address)
32{
33 return __va(address);
34}
35
36/*
37 * readb - read byte from memory mapped device
38 * @addr: pointer to memory
39 *
40 */
41static inline u8 __raw_readb(const volatile void __iomem *addr)
42{
43 u8 val;
44 asm volatile(
45 "%0 = memb(%1);"
46 : "=&r" (val)
47 : "r" (addr)
48 );
49 return val;
50}
51#define __raw_readb __raw_readb
52
53static inline u16 __raw_readw(const volatile void __iomem *addr)
54{
55 u16 val;
56 asm volatile(
57 "%0 = memh(%1);"
58 : "=&r" (val)
59 : "r" (addr)
60 );
61 return val;
62}
63#define __raw_readw __raw_readw
64
65static inline u32 __raw_readl(const volatile void __iomem *addr)
66{
67 u32 val;
68 asm volatile(
69 "%0 = memw(%1);"
70 : "=&r" (val)
71 : "r" (addr)
72 );
73 return val;
74}
75#define __raw_readl __raw_readl
76
77/*
78 * writeb - write a byte to a memory location
79 * @data: data to write to
80 * @addr: pointer to memory
81 *
82 */
83static inline void __raw_writeb(u8 data, volatile void __iomem *addr)
84{
85 asm volatile(
86 "memb(%0) = %1;"
87 :
88 : "r" (addr), "r" (data)
89 : "memory"
90 );
91}
92#define __raw_writeb __raw_writeb
93
94static inline void __raw_writew(u16 data, volatile void __iomem *addr)
95{
96 asm volatile(
97 "memh(%0) = %1;"
98 :
99 : "r" (addr), "r" (data)
100 : "memory"
101 );
102
103}
104#define __raw_writew __raw_writew
105
106static inline void __raw_writel(u32 data, volatile void __iomem *addr)
107{
108 asm volatile(
109 "memw(%0) = %1;"
110 :
111 : "r" (addr), "r" (data)
112 : "memory"
113 );
114}
115#define __raw_writel __raw_writel
116
117/*
118 * I/O memory mapping functions.
119 */
120#define _PAGE_IOREMAP (_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
121 (__HEXAGON_C_DEV << 6))
122
123/*
124 * These defines are necessary to use the generic io.h for filling in
125 * the missing parts of the API contract. This is because the platform
126 * uses (inline) functions rather than defines and the generic helper
127 * fills in the undefined.
128 */
129#define virt_to_phys virt_to_phys
130#define phys_to_virt phys_to_virt
131#include <asm-generic/io.h>
132
133#endif