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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
5adcaf50 SR |
2 | /* |
3 | * I/O string operations | |
4 | * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org) | |
5 | * Copyright (C) 2006 IBM Corporation | |
6 | * | |
7 | * Largely rewritten by Cort Dougan (cort@cs.nmt.edu) | |
8 | * and Paul Mackerras. | |
9 | * | |
10 | * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com) | |
11 | * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com) | |
12 | * | |
13 | * Rewritten in C by Stephen Rothwell. | |
5adcaf50 SR |
14 | */ |
15 | #include <linux/kernel.h> | |
16 | #include <linux/types.h> | |
17 | #include <linux/compiler.h> | |
4b16f8e2 | 18 | #include <linux/export.h> |
5adcaf50 SR |
19 | |
20 | #include <asm/io.h> | |
caf81329 SR |
21 | #include <asm/firmware.h> |
22 | #include <asm/bug.h> | |
5adcaf50 | 23 | |
3fafe9c2 BH |
24 | /* See definition in io.h */ |
25 | bool isa_io_special; | |
26 | ||
4cb3cee0 | 27 | void _insb(const volatile u8 __iomem *port, void *buf, long count) |
5adcaf50 SR |
28 | { |
29 | u8 *tbuf = buf; | |
30 | u8 tmp; | |
31 | ||
32 | if (unlikely(count <= 0)) | |
33 | return; | |
34 | asm volatile("sync"); | |
35 | do { | |
36 | tmp = *port; | |
74a0ba61 | 37 | eieio(); |
5adcaf50 SR |
38 | *tbuf++ = tmp; |
39 | } while (--count != 0); | |
40 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
41 | } | |
42 | EXPORT_SYMBOL(_insb); | |
43 | ||
44 | void _outsb(volatile u8 __iomem *port, const void *buf, long count) | |
45 | { | |
46 | const u8 *tbuf = buf; | |
47 | ||
48 | if (unlikely(count <= 0)) | |
49 | return; | |
50 | asm volatile("sync"); | |
51 | do { | |
52 | *port = *tbuf++; | |
53 | } while (--count != 0); | |
54 | asm volatile("sync"); | |
55 | } | |
56 | EXPORT_SYMBOL(_outsb); | |
57 | ||
4cb3cee0 | 58 | void _insw_ns(const volatile u16 __iomem *port, void *buf, long count) |
5adcaf50 SR |
59 | { |
60 | u16 *tbuf = buf; | |
61 | u16 tmp; | |
62 | ||
63 | if (unlikely(count <= 0)) | |
64 | return; | |
65 | asm volatile("sync"); | |
66 | do { | |
67 | tmp = *port; | |
74a0ba61 | 68 | eieio(); |
5adcaf50 SR |
69 | *tbuf++ = tmp; |
70 | } while (--count != 0); | |
71 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
72 | } | |
73 | EXPORT_SYMBOL(_insw_ns); | |
74 | ||
75 | void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count) | |
76 | { | |
77 | const u16 *tbuf = buf; | |
78 | ||
79 | if (unlikely(count <= 0)) | |
80 | return; | |
81 | asm volatile("sync"); | |
82 | do { | |
83 | *port = *tbuf++; | |
84 | } while (--count != 0); | |
85 | asm volatile("sync"); | |
86 | } | |
87 | EXPORT_SYMBOL(_outsw_ns); | |
88 | ||
4cb3cee0 | 89 | void _insl_ns(const volatile u32 __iomem *port, void *buf, long count) |
5adcaf50 SR |
90 | { |
91 | u32 *tbuf = buf; | |
92 | u32 tmp; | |
93 | ||
94 | if (unlikely(count <= 0)) | |
95 | return; | |
96 | asm volatile("sync"); | |
97 | do { | |
98 | tmp = *port; | |
74a0ba61 | 99 | eieio(); |
5adcaf50 SR |
100 | *tbuf++ = tmp; |
101 | } while (--count != 0); | |
102 | asm volatile("twi 0,%0,0; isync" : : "r" (tmp)); | |
103 | } | |
104 | EXPORT_SYMBOL(_insl_ns); | |
105 | ||
106 | void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count) | |
107 | { | |
108 | const u32 *tbuf = buf; | |
109 | ||
110 | if (unlikely(count <= 0)) | |
111 | return; | |
112 | asm volatile("sync"); | |
113 | do { | |
114 | *port = *tbuf++; | |
115 | } while (--count != 0); | |
116 | asm volatile("sync"); | |
117 | } | |
118 | EXPORT_SYMBOL(_outsl_ns); | |
68a64357 BH |
119 | |
120 | #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0) | |
121 | ||
4e491d14 SR |
122 | notrace void |
123 | _memset_io(volatile void __iomem *addr, int c, unsigned long n) | |
68a64357 BH |
124 | { |
125 | void *p = (void __force *)addr; | |
126 | u32 lc = c; | |
127 | lc |= lc << 8; | |
128 | lc |= lc << 16; | |
129 | ||
130 | __asm__ __volatile__ ("sync" : : : "memory"); | |
131 | while(n && !IO_CHECK_ALIGN(p, 4)) { | |
132 | *((volatile u8 *)p) = c; | |
133 | p++; | |
134 | n--; | |
135 | } | |
136 | while(n >= 4) { | |
137 | *((volatile u32 *)p) = lc; | |
138 | p += 4; | |
139 | n -= 4; | |
140 | } | |
141 | while(n) { | |
142 | *((volatile u8 *)p) = c; | |
143 | p++; | |
144 | n--; | |
145 | } | |
146 | __asm__ __volatile__ ("sync" : : : "memory"); | |
147 | } | |
148 | EXPORT_SYMBOL(_memset_io); | |
149 | ||
150 | void _memcpy_fromio(void *dest, const volatile void __iomem *src, | |
151 | unsigned long n) | |
152 | { | |
153 | void *vsrc = (void __force *) src; | |
154 | ||
155 | __asm__ __volatile__ ("sync" : : : "memory"); | |
156 | while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) { | |
157 | *((u8 *)dest) = *((volatile u8 *)vsrc); | |
74a0ba61 | 158 | eieio(); |
68a64357 BH |
159 | vsrc++; |
160 | dest++; | |
161 | n--; | |
162 | } | |
a22c65f8 | 163 | while(n >= 4) { |
68a64357 | 164 | *((u32 *)dest) = *((volatile u32 *)vsrc); |
74a0ba61 | 165 | eieio(); |
68a64357 BH |
166 | vsrc += 4; |
167 | dest += 4; | |
168 | n -= 4; | |
169 | } | |
170 | while(n) { | |
171 | *((u8 *)dest) = *((volatile u8 *)vsrc); | |
74a0ba61 | 172 | eieio(); |
68a64357 BH |
173 | vsrc++; |
174 | dest++; | |
175 | n--; | |
176 | } | |
177 | __asm__ __volatile__ ("sync" : : : "memory"); | |
178 | } | |
179 | EXPORT_SYMBOL(_memcpy_fromio); | |
180 | ||
181 | void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n) | |
182 | { | |
183 | void *vdest = (void __force *) dest; | |
184 | ||
185 | __asm__ __volatile__ ("sync" : : : "memory"); | |
186 | while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) { | |
187 | *((volatile u8 *)vdest) = *((u8 *)src); | |
188 | src++; | |
189 | vdest++; | |
190 | n--; | |
191 | } | |
a22c65f8 | 192 | while(n >= 4) { |
68a64357 BH |
193 | *((volatile u32 *)vdest) = *((volatile u32 *)src); |
194 | src += 4; | |
195 | vdest += 4; | |
196 | n-=4; | |
197 | } | |
198 | while(n) { | |
199 | *((volatile u8 *)vdest) = *((u8 *)src); | |
200 | src++; | |
201 | vdest++; | |
202 | n--; | |
203 | } | |
204 | __asm__ __volatile__ ("sync" : : : "memory"); | |
205 | } | |
206 | EXPORT_SYMBOL(_memcpy_toio); |