summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/io.c
blob: c1aa07524c2655b44c26d1ad2e436bb91114efb0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
/*
 * I/O string operations
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *    Copyright (C) 2006 IBM Corporation
 *
 * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
 * and Paul Mackerras.
 *
 * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
 * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
 *
 * Rewritten in C by Stephen Rothwell.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/module.h>

#include <asm/io.h>
#include <asm/firmware.h>
#include <asm/bug.h>

void _insb(const volatile u8 __iomem *port, void *buf, long count)
{
	u8 *tbuf = buf;
	u8 tmp;

	if (unlikely(count <= 0))
		return;
	asm volatile("sync");
	do {
		tmp = *port;
		asm volatile("eieio");
		*tbuf++ = tmp;
	} while (--count != 0);
	asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
}
EXPORT_SYMBOL(_insb);

void _outsb(volatile u8 __iomem *port, const void *buf, long count)
{
	const u8 *tbuf = buf;

	if (unlikely(count <= 0))
		return;
	asm volatile("sync");
	do {
		*port = *tbuf++;
	} while (--count != 0);
	asm volatile("sync");
}
EXPORT_SYMBOL(_outsb);

void _insw_ns(const volatile u16 __iomem *port, void *buf, long count)
{
	u16 *tbuf = buf;
	u16 tmp;

	if (unlikely(count <= 0))
		return;
	asm volatile("sync");
	do {
		tmp = *port;
		asm volatile("eieio");
		*tbuf++ = tmp;
	} while (--count != 0);
	asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
}
EXPORT_SYMBOL(_insw_ns);

void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count)
{
	const u16 *tbuf = buf;

	if (unlikely(count <= 0))
		return;
	asm volatile("sync");
	do {
		*port = *tbuf++;
	} while (--count != 0);
	asm volatile("sync");
}
EXPORT_SYMBOL(_outsw_ns);

void _insl_ns(const volatile u32 __iomem *port, void *buf, long count)
{
	u32 *tbuf = buf;
	u32 tmp;

	if (unlikely(count <= 0))
		return;
	asm volatile("sync");
	do {
		tmp = *port;
		asm volatile("eieio");
		*tbuf++ = tmp;
	} while (--count != 0);
	asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
}
EXPORT_SYMBOL(_insl_ns);

void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count)
{
	const u32 *tbuf = buf;

	if (unlikely(count <= 0))
		return;
	asm volatile("sync");
	do {
		*port = *tbuf++;
	} while (--count != 0);
	asm volatile("sync");
}
EXPORT_SYMBOL(_outsl_ns);