2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
11 #include <linux/compiler.h>
14 * This file contains the definitions for the x86 IO instructions
15 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
16 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
17 * versions of the single-IO instructions (inb_p/inw_p/..).
19 * This file is not meant to be obfuscating: it's just complicated
20 * to (a) handle it all in a way that makes gcc able to optimize it
21 * as well as possible and (b) trying to avoid writing the same thing
22 * over and over again with slight variations and possibly making a
27 * Thanks to James van Artsdalen for a better timing-fix than
28 * the two short jumps: using outb's to a nonexistent port seems
29 * to guarantee better timings even on fast machines.
31 * On the other hand, I'd like to be sure of a non-existent port:
32 * I feel a bit unsafe about using 0x80 (should be safe, though)
38 * Bit simplified and optimized by Jan Hubicka
39 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
41 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
42 * isa_read[wl] and isa_write[wl] fixed
43 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
46 #define IO_SPACE_LIMIT 0xffff
48 #include <asm/types.h>
55 * readX/writeX() are used to access memory mapped devices. On some
56 * architectures the memory mapped IO stuff needs to be accessed
57 * differently. On the x86 architecture, we just read/write the
58 * memory location directly.
61 #define readb(addr) (*(volatile unsigned char *) (addr))
62 #define readw(addr) (*(volatile unsigned short *) (addr))
63 #define readl(addr) (*(volatile unsigned int *) (addr))
64 #define readq(addr) (*(volatile unsigned long long *) (addr))
65 #define __raw_readb readb
66 #define __raw_readw readw
67 #define __raw_readl readl
68 #define __raw_readq readq
70 #define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
71 #define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
72 #define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
73 #define writeq(b,addr) (*(volatile unsigned long long *) (addr) = (b))
74 #define __raw_writeb writeb
75 #define __raw_writew writew
76 #define __raw_writel writel
77 #define __raw_writeq writeq
79 #define memset_io(a,b,c) memset((a),(b),(c))
80 #define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
81 #define memcpy_toio(a,b,c) memcpy((a),(b),(c))
83 #define write_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a)
84 #define read_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a))
86 #define write_le64(a, v) write_arch(q, le64, a, v)
87 #define write_le32(a, v) write_arch(l, le32, a, v)
88 #define write_le16(a, v) write_arch(w, le16, a, v)
90 #define read_le64(a) read_arch(q, le64, a)
91 #define read_le32(a) read_arch(l, le32, a)
92 #define read_le16(a) read_arch(w, le16, a)
94 #define write_be32(a, v) write_arch(l, be32, a, v)
95 #define write_be16(a, v) write_arch(w, be16, a, v)
97 #define read_be32(a) read_arch(l, be32, a)
98 #define read_be16(a) read_arch(w, be16, a)
100 #define write_8(a, v) __raw_writeb(v, a)
101 #define read_8(a) __raw_readb(a)
103 #define clrbits(type, addr, clear) \
104 write_##type((addr), read_##type(addr) & ~(clear))
106 #define setbits(type, addr, set) \
107 write_##type((addr), read_##type(addr) | (set))
109 #define clrsetbits(type, addr, clear, set) \
110 write_##type((addr), (read_##type(addr) & ~(clear)) | (set))
112 #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
113 #define setbits_be32(addr, set) setbits(be32, addr, set)
114 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
116 #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
117 #define setbits_le32(addr, set) setbits(le32, addr, set)
118 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
120 #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
121 #define setbits_be16(addr, set) setbits(be16, addr, set)
122 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
124 #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
125 #define setbits_le16(addr, set) setbits(le16, addr, set)
126 #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
128 #define clrbits_8(addr, clear) clrbits(8, addr, clear)
129 #define setbits_8(addr, set) setbits(8, addr, set)
130 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
132 #endif /* __KERNEL__ */
134 #ifdef SLOW_IO_BY_JUMPING
135 #define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
137 #define __SLOW_DOWN_IO "\noutb %%al,$0xed"
140 #ifdef REALLY_SLOW_IO
141 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
143 #define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
148 * Talk about misusing macros..
150 #define __OUT1(s,x) \
151 static inline void _out##s(unsigned x value, unsigned short port) {
153 #define __OUT2(s,s1,s2) \
154 __asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
157 #define __OUT(s,s1,x) \
158 __OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
159 __OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
162 static inline RETURN_TYPE _in##s(unsigned short port) { RETURN_TYPE _v;
164 #define __IN2(s,s1,s2) \
165 __asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
167 #define __IN(s,s1,i...) \
168 __IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
169 __IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
172 static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
173 { __asm__ __volatile__ ("rep ; ins" #s \
174 : "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
177 static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
178 { __asm__ __volatile__ ("rep ; outs" #s \
179 : "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
181 #define RETURN_TYPE unsigned char
184 #define RETURN_TYPE unsigned short
187 #define RETURN_TYPE unsigned int
191 #define inb(port) _inb((uintptr_t)(port))
192 #define inw(port) _inw((uintptr_t)(port))
193 #define inl(port) _inl((uintptr_t)(port))
199 #define outb(val, port) _outb(val, (uintptr_t)(port))
200 #define outw(val, port) _outw(val, (uintptr_t)(port))
201 #define outl(val, port) _outl(val, (uintptr_t)(port))
211 /* IO space accessors */
212 #define clrio(type, addr, clear) \
213 out##type(in##type(addr) & ~(clear), (addr))
215 #define setio(type, addr, set) \
216 out##type(in##type(addr) | (set), (addr))
218 #define clrsetio(type, addr, clear, set) \
219 out##type((in##type(addr) & ~(clear)) | (set), (addr))
221 #define clrio_32(addr, clear) clrio(l, addr, clear)
222 #define clrio_16(addr, clear) clrio(w, addr, clear)
223 #define clrio_8(addr, clear) clrio(b, addr, clear)
225 #define setio_32(addr, set) setio(l, addr, set)
226 #define setio_16(addr, set) setio(w, addr, set)
227 #define setio_8(addr, set) setio(b, addr, set)
229 #define clrsetio_32(addr, clear, set) clrsetio(l, addr, clear, set)
230 #define clrsetio_16(addr, clear, set) clrsetio(w, addr, clear, set)
231 #define clrsetio_8(addr, clear, set) clrsetio(b, addr, clear, set)
233 static inline void sync(void)
238 * TODO: The kernel offers some more advanced versions of barriers, it might
239 * have some advantages to use them instead of the simple one here.
241 #define dmb() __asm__ __volatile__ ("" : : : "memory")
242 #define __iormb() dmb()
243 #define __iowmb() dmb()
245 #include <asm-generic/io.h>
247 #endif /* _ASM_IO_H */