aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/io.c
blob: 1882bf419fa6f294db6adf46e15d2a428493c414 (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
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
/*
 * 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;
		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;
		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;
		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);

#define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0)

notrace void
_memset_io(volatile void __iomem *addr, int c, unsigned long n)
{
	void *p = (void __force *)addr;
	u32 lc = c;
	lc |= lc << 8;
	lc |= lc << 16;

	__asm__ __volatile__ ("sync" : : : "memory");
	while(n && !IO_CHECK_ALIGN(p, 4)) {
		*((volatile u8 *)p) = c;
		p++;
		n--;
	}
	while(n >= 4) {
		*((volatile u32 *)p) = lc;
		p += 4;
		n -= 4;
	}
	while(n) {
		*((volatile u8 *)p) = c;
		p++;
		n--;
	}
	__asm__ __volatile__ ("sync" : : : "memory");
}
EXPORT_SYMBOL(_memset_io);

void _memcpy_fromio(void *dest, const volatile void __iomem *src,
		    unsigned long n)
{
	void *vsrc = (void __force *) src;

	__asm__ __volatile__ ("sync" : : : "memory");
	while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) {
		*((u8 *)dest) = *((volatile u8 *)vsrc);
		eieio();
		vsrc++;
		dest++;
		n--;
	}
	while(n > 4) {
		*((u32 *)dest) = *((volatile u32 *)vsrc);
		eieio();
		vsrc += 4;
		dest += 4;
		n -= 4;
	}
	while(n) {
		*((u8 *)dest) = *((volatile u8 *)vsrc);
		eieio();
		vsrc++;
		dest++;
		n--;
	}
	__asm__ __volatile__ ("sync" : : : "memory");
}
EXPORT_SYMBOL(_memcpy_fromio);

void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n)
{
	void *vdest = (void __force *) dest;

	__asm__ __volatile__ ("sync" : : : "memory");
	while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) {
		*((volatile u8 *)vdest) = *((u8 *)src);
		src++;
		vdest++;
		n--;
	}
	while(n > 4) {
		*((volatile u32 *)vdest) = *((volatile u32 *)src);
		src += 4;
		vdest += 4;
		n-=4;
	}
	while(n) {
		*((volatile u8 *)vdest) = *((u8 *)src);
		src++;
		vdest++;
		n--;
	}
	__asm__ __volatile__ ("sync" : : : "memory");
}
EXPORT_SYMBOL(_memcpy_toio);