1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * (C) Copyright 2000-2002
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 */
6
7 #ifndef _ASM_IO_H
8 #define _ASM_IO_H
9
10 #include <linux/compiler.h>
11
12 /*
13 * This file contains the definitions for the x86 IO instructions
14 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
15 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
16 * versions of the single-IO instructions (inb_p/inw_p/..).
17 *
18 * This file is not meant to be obfuscating: it's just complicated
19 * to (a) handle it all in a way that makes gcc able to optimize it
20 * as well as possible and (b) trying to avoid writing the same thing
21 * over and over again with slight variations and possibly making a
22 * mistake somewhere.
23 */
24
25 /*
26 * Thanks to James van Artsdalen for a better timing-fix than
27 * the two short jumps: using outb's to a nonexistent port seems
28 * to guarantee better timings even on fast machines.
29 *
30 * On the other hand, I'd like to be sure of a non-existent port:
31 * I feel a bit unsafe about using 0x80 (should be safe, though)
32 *
33 * Linus
34 */
35
36 /*
37 * Bit simplified and optimized by Jan Hubicka
38 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
39 *
40 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
41 * isa_read[wl] and isa_write[wl] fixed
42 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
43 */
44
45 #define IO_SPACE_LIMIT 0xffff
46
47 #include <asm/types.h>
48
49
50 #ifdef __KERNEL__
51
52
53 /*
54 * readX/writeX() are used to access memory mapped devices. On some
55 * architectures the memory mapped IO stuff needs to be accessed
56 * differently. On the x86 architecture, we just read/write the
57 * memory location directly.
58 */
59
60 #define readb(addr) (*(volatile unsigned char *) (addr))
61 #define readw(addr) (*(volatile unsigned short *) (addr))
62 #define readl(addr) (*(volatile unsigned int *) (addr))
63 #define readq(addr) (*(volatile unsigned long long *) (addr))
64 #define __raw_readb readb
65 #define __raw_readw readw
66 #define __raw_readl readl
67 #define __raw_readq readq
68
69 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
70 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
71 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
72 #define writeq(b,addr) (*(volatile unsigned long long *) (addr) = (b))
73 #define __raw_writeb writeb
74 #define __raw_writew writew
75 #define __raw_writel writel
76 #define __raw_writeq writeq
77
78 #define memset_io(a,b,c) memset((a),(b),(c))
79 #define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
80 #define memcpy_toio(a,b,c) memcpy((a),(b),(c))
81
82 #define out_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a)
83 #define in_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a))
84
85 #define out_le64(a, v) out_arch(q, le64, a, v)
86 #define out_le32(a, v) out_arch(l, le32, a, v)
87 #define out_le16(a, v) out_arch(w, le16, a, v)
88
89 #define in_le64(a) in_arch(q, le64, a)
90 #define in_le32(a) in_arch(l, le32, a)
91 #define in_le16(a) in_arch(w, le16, a)
92
93 #define out_be32(a, v) out_arch(l, be32, a, v)
94 #define out_be16(a, v) out_arch(w, be16, a, v)
95
96 #define in_be32(a) in_arch(l, be32, a)
97 #define in_be16(a) in_arch(w, be16, a)
98
99 #define out_8(a, v) __raw_writeb(v, a)
100 #define in_8(a) __raw_readb(a)
101
102 #define clrbits(type, addr, clear) \
103 out_##type((addr), in_##type(addr) & ~(clear))
104
105 #define setbits(type, addr, set) \
106 out_##type((addr), in_##type(addr) | (set))
107
108 #define clrsetbits(type, addr, clear, set) \
109 out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
110
111 #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
112 #define setbits_be32(addr, set) setbits(be32, addr, set)
113 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
114
115 #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
116 #define setbits_le32(addr, set) setbits(le32, addr, set)
117 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
118
119 #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
120 #define setbits_be16(addr, set) setbits(be16, addr, set)
121 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
122
123 #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
124 #define setbits_le16(addr, set) setbits(le16, addr, set)
125 #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
126
127 #define clrbits_8(addr, clear) clrbits(8, addr, clear)
128 #define setbits_8(addr, set) setbits(8, addr, set)
129 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
130
131 #endif /* __KERNEL__ */
132
133 #ifdef SLOW_IO_BY_JUMPING
134 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
135 #else
136 #define __SLOW_DOWN_IO "\noutb %%al,$0xed"
137 #endif
138
139 #ifdef REALLY_SLOW_IO
140 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
141 #else
142 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
143 #endif
144
145
146 /*
147 * Talk about misusing macros..
148 */
149 #define __OUT1(s,x) \
150 static inline void _out##s(unsigned x value, unsigned short port) {
151
152 #define __OUT2(s,s1,s2) \
153 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
154
155
156 #define __OUT(s,s1,x) \
157 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
158 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
159
160 #define __IN1(s) \
161 static inline RETURN_TYPE _in##s(unsigned short port) { RETURN_TYPE _v;
162
163 #define __IN2(s,s1,s2) \
164 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
165
166 #define __IN(s,s1,i...) \
167 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
168 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
169
170 #define __INS(s) \
171 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
172 { __asm__ __volatile__ ("rep ; ins" #s \
173 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
174
175 #define __OUTS(s) \
176 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
177 { __asm__ __volatile__ ("rep ; outs" #s \
178 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
179
180 #define RETURN_TYPE unsigned char
181 __IN(b,"")
182 #undef RETURN_TYPE
183 #define RETURN_TYPE unsigned short
184 __IN(w,"")
185 #undef RETURN_TYPE
186 #define RETURN_TYPE unsigned int
187 __IN(l,"")
188 #undef RETURN_TYPE
189
190 #define inb(port) _inb((uintptr_t)(port))
191 #define inw(port) _inw((uintptr_t)(port))
192 #define inl(port) _inl((uintptr_t)(port))
193
194 __OUT(b,"b",char)
195 __OUT(w,"w",short)
196 __OUT(l,,int)
197
198 #define outb(val, port) _outb(val, (uintptr_t)(port))
199 #define outw(val, port) _outw(val, (uintptr_t)(port))
200 #define outl(val, port) _outl(val, (uintptr_t)(port))
201
__INS(b)202 __INS(b)
203 __INS(w)
204 __INS(l)
205
206 __OUTS(b)
207 __OUTS(w)
208 __OUTS(l)
209
210 /* IO space accessors */
211 #define clrio(type, addr, clear) \
212 out##type(in##type(addr) & ~(clear), (addr))
213
214 #define setio(type, addr, set) \
215 out##type(in##type(addr) | (set), (addr))
216
217 #define clrsetio(type, addr, clear, set) \
218 out##type((in##type(addr) & ~(clear)) | (set), (addr))
219
220 #define clrio_32(addr, clear) clrio(l, addr, clear)
221 #define clrio_16(addr, clear) clrio(w, addr, clear)
222 #define clrio_8(addr, clear) clrio(b, addr, clear)
223
224 #define setio_32(addr, set) setio(l, addr, set)
225 #define setio_16(addr, set) setio(w, addr, set)
226 #define setio_8(addr, set) setio(b, addr, set)
227
228 #define clrsetio_32(addr, clear, set) clrsetio(l, addr, clear, set)
229 #define clrsetio_16(addr, clear, set) clrsetio(w, addr, clear, set)
230 #define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
231
232 static inline void sync(void)
233 {
234 }
235
236 /*
237 * TODO: The kernel offers some more advanced versions of barriers, it might
238 * have some advantages to use them instead of the simple one here.
239 */
240 #define dmb() __asm__ __volatile__ ("" : : : "memory")
241 #define __iormb() dmb()
242 #define __iowmb() dmb()
243
244 #include <asm-generic/io.h>
245
246 #endif /* _ASM_IO_H */
247