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5adcaf50 SR |
1 | /* |
2 | * I/O string operations | |
3 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
4 | * Copyright (C) 2006 IBM Corporation | |
5 | * | |
6 | * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) | |
7 | * and Paul Mackerras. | |
8 | * | |
9 | * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) | |
10 | * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) | |
11 | * | |
12 | * Rewritten in C by Stephen Rothwell. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | */ | |
19 | #include <linux/kernel.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/compiler.h> | |
4b16f8e2 | 22 | #include <linux/export.h> |
5adcaf50 SR |
23 | |
24 | #include <asm/io.h> | |
caf81329 SR |
25 | #include <asm/firmware.h> |
26 | #include <asm/bug.h> | |
5adcaf50 | 27 | |
3fafe9c2 BH |
28 | /* See definition in io.h */ |
29 | bool isa_io_special; | |
30 | ||
4cb3cee0 | 31 | void _insb(const volatile u8 __iomem *port, void *buf, long count) |
5adcaf50 SR |
32 | { |
33 | u8 *tbuf = buf; | |
34 | u8 tmp; | |
35 | ||
36 | if (unlikely(count <= 0)) | |
37 | return; | |
38 | asm volatile("sync"); | |
39 | do { | |
40 | tmp = *port; | |
74a0ba61 | 41 | eieio(); |
5adcaf50 SR |
42 | *tbuf++ = tmp; |
43 | } while (--count != 0); | |
44 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
45 | } | |
46 | EXPORT_SYMBOL(_insb); | |
47 | ||
48 | void _outsb(volatile u8 __iomem *port, const void *buf, long count) | |
49 | { | |
50 | const u8 *tbuf = buf; | |
51 | ||
52 | if (unlikely(count <= 0)) | |
53 | return; | |
54 | asm volatile("sync"); | |
55 | do { | |
56 | *port = *tbuf++; | |
57 | } while (--count != 0); | |
58 | asm volatile("sync"); | |
59 | } | |
60 | EXPORT_SYMBOL(_outsb); | |
61 | ||
4cb3cee0 | 62 | void _insw_ns(const volatile u16 __iomem *port, void *buf, long count) |
5adcaf50 SR |
63 | { |
64 | u16 *tbuf = buf; | |
65 | u16 tmp; | |
66 | ||
67 | if (unlikely(count <= 0)) | |
68 | return; | |
69 | asm volatile("sync"); | |
70 | do { | |
71 | tmp = *port; | |
74a0ba61 | 72 | eieio(); |
5adcaf50 SR |
73 | *tbuf++ = tmp; |
74 | } while (--count != 0); | |
75 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
76 | } | |
77 | EXPORT_SYMBOL(_insw_ns); | |
78 | ||
79 | void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count) | |
80 | { | |
81 | const u16 *tbuf = buf; | |
82 | ||
83 | if (unlikely(count <= 0)) | |
84 | return; | |
85 | asm volatile("sync"); | |
86 | do { | |
87 | *port = *tbuf++; | |
88 | } while (--count != 0); | |
89 | asm volatile("sync"); | |
90 | } | |
91 | EXPORT_SYMBOL(_outsw_ns); | |
92 | ||
4cb3cee0 | 93 | void _insl_ns(const volatile u32 __iomem *port, void *buf, long count) |
5adcaf50 SR |
94 | { |
95 | u32 *tbuf = buf; | |
96 | u32 tmp; | |
97 | ||
98 | if (unlikely(count <= 0)) | |
99 | return; | |
100 | asm volatile("sync"); | |
101 | do { | |
102 | tmp = *port; | |
74a0ba61 | 103 | eieio(); |
5adcaf50 SR |
104 | *tbuf++ = tmp; |
105 | } while (--count != 0); | |
106 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
107 | } | |
108 | EXPORT_SYMBOL(_insl_ns); | |
109 | ||
110 | void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count) | |
111 | { | |
112 | const u32 *tbuf = buf; | |
113 | ||
114 | if (unlikely(count <= 0)) | |
115 | return; | |
116 | asm volatile("sync"); | |
117 | do { | |
118 | *port = *tbuf++; | |
119 | } while (--count != 0); | |
120 | asm volatile("sync"); | |
121 | } | |
122 | EXPORT_SYMBOL(_outsl_ns); | |
68a64357 BH |
123 | |
124 | #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0) | |
125 | ||
4e491d14 SR |
126 | notrace void |
127 | _memset_io(volatile void __iomem *addr, int c, unsigned long n) | |
68a64357 BH |
128 | { |
129 | void *p = (void __force *)addr; | |
130 | u32 lc = c; | |
131 | lc |= lc << 8; | |
132 | lc |= lc << 16; | |
133 | ||
134 | __asm__ __volatile__ ("sync" : : : "memory"); | |
135 | while(n && !IO_CHECK_ALIGN(p, 4)) { | |
136 | *((volatile u8 *)p) = c; | |
137 | p++; | |
138 | n--; | |
139 | } | |
140 | while(n >= 4) { | |
141 | *((volatile u32 *)p) = lc; | |
142 | p += 4; | |
143 | n -= 4; | |
144 | } | |
145 | while(n) { | |
146 | *((volatile u8 *)p) = c; | |
147 | p++; | |
148 | n--; | |
149 | } | |
150 | __asm__ __volatile__ ("sync" : : : "memory"); | |
151 | } | |
152 | EXPORT_SYMBOL(_memset_io); | |
153 | ||
154 | void _memcpy_fromio(void *dest, const volatile void __iomem *src, | |
155 | unsigned long n) | |
156 | { | |
157 | void *vsrc = (void __force *) src; | |
158 | ||
159 | __asm__ __volatile__ ("sync" : : : "memory"); | |
160 | while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) { | |
161 | *((u8 *)dest) = *((volatile u8 *)vsrc); | |
74a0ba61 | 162 | eieio(); |
68a64357 BH |
163 | vsrc++; |
164 | dest++; | |
165 | n--; | |
166 | } | |
a22c65f8 | 167 | while(n >= 4) { |
68a64357 | 168 | *((u32 *)dest) = *((volatile u32 *)vsrc); |
74a0ba61 | 169 | eieio(); |
68a64357 BH |
170 | vsrc += 4; |
171 | dest += 4; | |
172 | n -= 4; | |
173 | } | |
174 | while(n) { | |
175 | *((u8 *)dest) = *((volatile u8 *)vsrc); | |
74a0ba61 | 176 | eieio(); |
68a64357 BH |
177 | vsrc++; |
178 | dest++; | |
179 | n--; | |
180 | } | |
181 | __asm__ __volatile__ ("sync" : : : "memory"); | |
182 | } | |
183 | EXPORT_SYMBOL(_memcpy_fromio); | |
184 | ||
185 | void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n) | |
186 | { | |
187 | void *vdest = (void __force *) dest; | |
188 | ||
189 | __asm__ __volatile__ ("sync" : : : "memory"); | |
190 | while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) { | |
191 | *((volatile u8 *)vdest) = *((u8 *)src); | |
192 | src++; | |
193 | vdest++; | |
194 | n--; | |
195 | } | |
a22c65f8 | 196 | while(n >= 4) { |
68a64357 BH |
197 | *((volatile u32 *)vdest) = *((volatile u32 *)src); |
198 | src += 4; | |
199 | vdest += 4; | |
200 | n-=4; | |
201 | } | |
202 | while(n) { | |
203 | *((volatile u8 *)vdest) = *((u8 *)src); | |
204 | src++; | |
205 | vdest++; | |
206 | n--; | |
207 | } | |
208 | __asm__ __volatile__ ("sync" : : : "memory"); | |
209 | } | |
210 | EXPORT_SYMBOL(_memcpy_toio); |