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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 | |
4cb3cee0 | 28 | void _insb(const volatile u8 __iomem *port, void *buf, long count) |
5adcaf50 SR |
29 | { |
30 | u8 *tbuf = buf; | |
31 | u8 tmp; | |
32 | ||
33 | if (unlikely(count <= 0)) | |
34 | return; | |
35 | asm volatile("sync"); | |
36 | do { | |
37 | tmp = *port; | |
74a0ba61 | 38 | eieio(); |
5adcaf50 SR |
39 | *tbuf++ = tmp; |
40 | } while (--count != 0); | |
41 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
42 | } | |
43 | EXPORT_SYMBOL(_insb); | |
44 | ||
45 | void _outsb(volatile u8 __iomem *port, const void *buf, long count) | |
46 | { | |
47 | const u8 *tbuf = buf; | |
48 | ||
49 | if (unlikely(count <= 0)) | |
50 | return; | |
51 | asm volatile("sync"); | |
52 | do { | |
53 | *port = *tbuf++; | |
54 | } while (--count != 0); | |
55 | asm volatile("sync"); | |
56 | } | |
57 | EXPORT_SYMBOL(_outsb); | |
58 | ||
4cb3cee0 | 59 | void _insw_ns(const volatile u16 __iomem *port, void *buf, long count) |
5adcaf50 SR |
60 | { |
61 | u16 *tbuf = buf; | |
62 | u16 tmp; | |
63 | ||
64 | if (unlikely(count <= 0)) | |
65 | return; | |
66 | asm volatile("sync"); | |
67 | do { | |
68 | tmp = *port; | |
74a0ba61 | 69 | eieio(); |
5adcaf50 SR |
70 | *tbuf++ = tmp; |
71 | } while (--count != 0); | |
72 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
73 | } | |
74 | EXPORT_SYMBOL(_insw_ns); | |
75 | ||
76 | void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count) | |
77 | { | |
78 | const u16 *tbuf = buf; | |
79 | ||
80 | if (unlikely(count <= 0)) | |
81 | return; | |
82 | asm volatile("sync"); | |
83 | do { | |
84 | *port = *tbuf++; | |
85 | } while (--count != 0); | |
86 | asm volatile("sync"); | |
87 | } | |
88 | EXPORT_SYMBOL(_outsw_ns); | |
89 | ||
4cb3cee0 | 90 | void _insl_ns(const volatile u32 __iomem *port, void *buf, long count) |
5adcaf50 SR |
91 | { |
92 | u32 *tbuf = buf; | |
93 | u32 tmp; | |
94 | ||
95 | if (unlikely(count <= 0)) | |
96 | return; | |
97 | asm volatile("sync"); | |
98 | do { | |
99 | tmp = *port; | |
74a0ba61 | 100 | eieio(); |
5adcaf50 SR |
101 | *tbuf++ = tmp; |
102 | } while (--count != 0); | |
103 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
104 | } | |
105 | EXPORT_SYMBOL(_insl_ns); | |
106 | ||
107 | void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count) | |
108 | { | |
109 | const u32 *tbuf = buf; | |
110 | ||
111 | if (unlikely(count <= 0)) | |
112 | return; | |
113 | asm volatile("sync"); | |
114 | do { | |
115 | *port = *tbuf++; | |
116 | } while (--count != 0); | |
117 | asm volatile("sync"); | |
118 | } | |
119 | EXPORT_SYMBOL(_outsl_ns); | |
68a64357 BH |
120 | |
121 | #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0) | |
122 | ||
4e491d14 SR |
123 | notrace void |
124 | _memset_io(volatile void __iomem *addr, int c, unsigned long n) | |
68a64357 BH |
125 | { |
126 | void *p = (void __force *)addr; | |
127 | u32 lc = c; | |
128 | lc |= lc << 8; | |
129 | lc |= lc << 16; | |
130 | ||
131 | __asm__ __volatile__ ("sync" : : : "memory"); | |
132 | while(n && !IO_CHECK_ALIGN(p, 4)) { | |
133 | *((volatile u8 *)p) = c; | |
134 | p++; | |
135 | n--; | |
136 | } | |
137 | while(n >= 4) { | |
138 | *((volatile u32 *)p) = lc; | |
139 | p += 4; | |
140 | n -= 4; | |
141 | } | |
142 | while(n) { | |
143 | *((volatile u8 *)p) = c; | |
144 | p++; | |
145 | n--; | |
146 | } | |
147 | __asm__ __volatile__ ("sync" : : : "memory"); | |
148 | } | |
149 | EXPORT_SYMBOL(_memset_io); | |
150 | ||
151 | void _memcpy_fromio(void *dest, const volatile void __iomem *src, | |
152 | unsigned long n) | |
153 | { | |
154 | void *vsrc = (void __force *) src; | |
155 | ||
156 | __asm__ __volatile__ ("sync" : : : "memory"); | |
157 | while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) { | |
158 | *((u8 *)dest) = *((volatile u8 *)vsrc); | |
74a0ba61 | 159 | eieio(); |
68a64357 BH |
160 | vsrc++; |
161 | dest++; | |
162 | n--; | |
163 | } | |
a22c65f8 | 164 | while(n >= 4) { |
68a64357 | 165 | *((u32 *)dest) = *((volatile u32 *)vsrc); |
74a0ba61 | 166 | eieio(); |
68a64357 BH |
167 | vsrc += 4; |
168 | dest += 4; | |
169 | n -= 4; | |
170 | } | |
171 | while(n) { | |
172 | *((u8 *)dest) = *((volatile u8 *)vsrc); | |
74a0ba61 | 173 | eieio(); |
68a64357 BH |
174 | vsrc++; |
175 | dest++; | |
176 | n--; | |
177 | } | |
178 | __asm__ __volatile__ ("sync" : : : "memory"); | |
179 | } | |
180 | EXPORT_SYMBOL(_memcpy_fromio); | |
181 | ||
182 | void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n) | |
183 | { | |
184 | void *vdest = (void __force *) dest; | |
185 | ||
186 | __asm__ __volatile__ ("sync" : : : "memory"); | |
187 | while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) { | |
188 | *((volatile u8 *)vdest) = *((u8 *)src); | |
189 | src++; | |
190 | vdest++; | |
191 | n--; | |
192 | } | |
a22c65f8 | 193 | while(n >= 4) { |
68a64357 BH |
194 | *((volatile u32 *)vdest) = *((volatile u32 *)src); |
195 | src += 4; | |
196 | vdest += 4; | |
197 | n-=4; | |
198 | } | |
199 | while(n) { | |
200 | *((volatile u8 *)vdest) = *((u8 *)src); | |
201 | src++; | |
202 | vdest++; | |
203 | n--; | |
204 | } | |
205 | __asm__ __volatile__ ("sync" : : : "memory"); | |
206 | } | |
207 | EXPORT_SYMBOL(_memcpy_toio); |