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wdenk2262cfe2002-11-18 00:14:45 +00001#ifndef _ASM_IO_H
2#define _ASM_IO_H
3
Masahiro Yamadaafc366f2014-11-26 16:00:58 +09004#include <linux/compiler.h>
Gabe Blackec516c42012-10-23 18:04:44 +00005
wdenk2262cfe2002-11-18 00:14:45 +00006/*
7 * This file contains the definitions for the x86 IO instructions
8 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
9 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
10 * versions of the single-IO instructions (inb_p/inw_p/..).
11 *
12 * This file is not meant to be obfuscating: it's just complicated
13 * to (a) handle it all in a way that makes gcc able to optimize it
14 * as well as possible and (b) trying to avoid writing the same thing
15 * over and over again with slight variations and possibly making a
16 * mistake somewhere.
17 */
18
19/*
20 * Thanks to James van Artsdalen for a better timing-fix than
21 * the two short jumps: using outb's to a nonexistent port seems
22 * to guarantee better timings even on fast machines.
23 *
24 * On the other hand, I'd like to be sure of a non-existent port:
25 * I feel a bit unsafe about using 0x80 (should be safe, though)
26 *
27 * Linus
28 */
29
30 /*
31 * Bit simplified and optimized by Jan Hubicka
32 * Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
33 *
34 * isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
35 * isa_read[wl] and isa_write[wl] fixed
36 * - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
37 */
38
39#define IO_SPACE_LIMIT 0xffff
40
Gabe Black687c1082012-10-20 12:33:13 +000041#include <asm/types.h>
42
wdenk2262cfe2002-11-18 00:14:45 +000043
44#ifdef __KERNEL__
45
46
47/*
48 * readX/writeX() are used to access memory mapped devices. On some
49 * architectures the memory mapped IO stuff needs to be accessed
50 * differently. On the x86 architecture, we just read/write the
51 * memory location directly.
52 */
53
54#define readb(addr) (*(volatile unsigned char *) (addr))
55#define readw(addr) (*(volatile unsigned short *) (addr))
56#define readl(addr) (*(volatile unsigned int *) (addr))
57#define __raw_readb readb
58#define __raw_readw readw
59#define __raw_readl readl
60
61#define writeb(b,addr) (*(volatile unsigned char *) (addr) = (b))
62#define writew(b,addr) (*(volatile unsigned short *) (addr) = (b))
63#define writel(b,addr) (*(volatile unsigned int *) (addr) = (b))
64#define __raw_writeb writeb
65#define __raw_writew writew
66#define __raw_writel writel
67
68#define memset_io(a,b,c) memset((a),(b),(c))
69#define memcpy_fromio(a,b,c) memcpy((a),(b),(c))
70#define memcpy_toio(a,b,c) memcpy((a),(b),(c))
71
Simon Glass3f70a6f2014-11-12 22:42:17 -070072#define write_arch(type, endian, a, v) __raw_write##type(cpu_to_##endian(v), a)
73#define read_arch(type, endian, a) endian##_to_cpu(__raw_read##type(a))
74
75#define write_le64(a, v) write_arch(q, le64, a, v)
76#define write_le32(a, v) write_arch(l, le32, a, v)
77#define write_le16(a, v) write_arch(w, le16, a, v)
78
79#define read_le64(a) read_arch(q, le64, a)
80#define read_le32(a) read_arch(l, le32, a)
81#define read_le16(a) read_arch(w, le16, a)
82
83#define write_be32(a, v) write_arch(l, be32, a, v)
84#define write_be16(a, v) write_arch(w, be16, a, v)
85
86#define read_be32(a) read_arch(l, be32, a)
87#define read_be16(a) read_arch(w, be16, a)
88
89#define write_8(a, v) __raw_writeb(v, a)
90#define read_8(a) __raw_readb(a)
91
92#define clrbits(type, addr, clear) \
93 write_##type((addr), read_##type(addr) & ~(clear))
94
95#define setbits(type, addr, set) \
96 write_##type((addr), read_##type(addr) | (set))
97
98#define clrsetbits(type, addr, clear, set) \
99 write_##type((addr), (read_##type(addr) & ~(clear)) | (set))
100
101#define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
102#define setbits_be32(addr, set) setbits(be32, addr, set)
103#define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
104
105#define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
106#define setbits_le32(addr, set) setbits(le32, addr, set)
107#define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
108
109#define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
110#define setbits_be16(addr, set) setbits(be16, addr, set)
111#define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
112
113#define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
114#define setbits_le16(addr, set) setbits(le16, addr, set)
115#define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
116
117#define clrbits_8(addr, clear) clrbits(8, addr, clear)
118#define setbits_8(addr, set) setbits(8, addr, set)
119#define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
120
wdenk2262cfe2002-11-18 00:14:45 +0000121/*
122 * ISA space is 'always mapped' on a typical x86 system, no need to
123 * explicitly ioremap() it. The fact that the ISA IO space is mapped
124 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
125 * are physical addresses. The following constant pointer can be
126 * used as the IO-area pointer (it can be iounmapped as well, so the
127 * analogy with PCI is quite large):
128 */
129#define isa_readb(a) readb((a))
130#define isa_readw(a) readw((a))
131#define isa_readl(a) readl((a))
132#define isa_writeb(b,a) writeb(b,(a))
133#define isa_writew(w,a) writew(w,(a))
134#define isa_writel(l,a) writel(l,(a))
135#define isa_memset_io(a,b,c) memset_io((a),(b),(c))
136#define isa_memcpy_fromio(a,b,c) memcpy_fromio((a),(b),(c))
137#define isa_memcpy_toio(a,b,c) memcpy_toio((a),(b),(c))
138
139
wdenk2262cfe2002-11-18 00:14:45 +0000140static inline int check_signature(unsigned long io_addr,
141 const unsigned char *signature, int length)
142{
143 int retval = 0;
144 do {
145 if (readb(io_addr) != *signature)
146 goto out;
147 io_addr++;
148 signature++;
149 length--;
150 } while (length);
151 retval = 1;
152out:
153 return retval;
154}
155
156/**
157 * isa_check_signature - find BIOS signatures
wdenk8bde7f72003-06-27 21:31:46 +0000158 * @io_addr: mmio address to check
wdenk2262cfe2002-11-18 00:14:45 +0000159 * @signature: signature block
160 * @length: length of signature
161 *
162 * Perform a signature comparison with the ISA mmio address io_addr.
163 * Returns 1 on a match.
164 *
165 * This function is deprecated. New drivers should use ioremap and
166 * check_signature.
167 */
wdenk8bde7f72003-06-27 21:31:46 +0000168
wdenk2262cfe2002-11-18 00:14:45 +0000169
170static inline int isa_check_signature(unsigned long io_addr,
171 const unsigned char *signature, int length)
172{
173 int retval = 0;
174 do {
175 if (isa_readb(io_addr) != *signature)
176 goto out;
177 io_addr++;
178 signature++;
179 length--;
180 } while (length);
181 retval = 1;
182out:
183 return retval;
184}
185
186#endif /* __KERNEL__ */
187
188#ifdef SLOW_IO_BY_JUMPING
189#define __SLOW_DOWN_IO "\njmp 1f\n1:\tjmp 1f\n1:"
190#else
Stefan Reinauer339c5112012-10-20 12:33:16 +0000191#define __SLOW_DOWN_IO "\noutb %%al,$0xed"
wdenk2262cfe2002-11-18 00:14:45 +0000192#endif
193
194#ifdef REALLY_SLOW_IO
195#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
196#else
197#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
198#endif
199
200
201/*
202 * Talk about misusing macros..
203 */
204#define __OUT1(s,x) \
205static inline void out##s(unsigned x value, unsigned short port) {
206
207#define __OUT2(s,s1,s2) \
208__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1"
209
210
211#define __OUT(s,s1,x) \
212__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \
wdenk8bde7f72003-06-27 21:31:46 +0000213__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));}
wdenk2262cfe2002-11-18 00:14:45 +0000214
215#define __IN1(s) \
216static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v;
217
218#define __IN2(s,s1,s2) \
219__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0"
220
221#define __IN(s,s1,i...) \
222__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \
wdenk8bde7f72003-06-27 21:31:46 +0000223__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; }
wdenk2262cfe2002-11-18 00:14:45 +0000224
225#define __INS(s) \
226static inline void ins##s(unsigned short port, void * addr, unsigned long count) \
227{ __asm__ __volatile__ ("rep ; ins" #s \
228: "=D" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
229
230#define __OUTS(s) \
231static inline void outs##s(unsigned short port, const void * addr, unsigned long count) \
232{ __asm__ __volatile__ ("rep ; outs" #s \
233: "=S" (addr), "=c" (count) : "d" (port),"0" (addr),"1" (count)); }
234
235#define RETURN_TYPE unsigned char
236__IN(b,"")
237#undef RETURN_TYPE
238#define RETURN_TYPE unsigned short
239__IN(w,"")
240#undef RETURN_TYPE
241#define RETURN_TYPE unsigned int
242__IN(l,"")
243#undef RETURN_TYPE
244
245__OUT(b,"b",char)
246__OUT(w,"w",short)
247__OUT(l,,int)
248
249__INS(b)
250__INS(w)
251__INS(l)
252
253__OUTS(b)
254__OUTS(w)
255__OUTS(l)
256
Haiying Wang3a197b22007-02-21 16:52:31 +0100257static inline void sync(void)
258{
259}
260
Haavard Skinnemoen4d7d6932007-12-13 12:56:33 +0100261/*
262 * Given a physical address and a length, return a virtual address
263 * that can be used to access the memory range with the caching
264 * properties specified by "flags".
265 */
Haavard Skinnemoen4d7d6932007-12-13 12:56:33 +0100266#define MAP_NOCACHE (0)
267#define MAP_WRCOMBINE (0)
268#define MAP_WRBACK (0)
269#define MAP_WRTHROUGH (0)
270
271static inline void *
272map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
273{
Gabe Blackec516c42012-10-23 18:04:44 +0000274 return (void *)(uintptr_t)paddr;
Haavard Skinnemoen4d7d6932007-12-13 12:56:33 +0100275}
276
277/*
278 * Take down a mapping set up by map_physmem().
279 */
280static inline void unmap_physmem(void *vaddr, unsigned long flags)
281{
282
283}
284
Kumar Gala65e43a12008-12-13 17:20:27 -0600285static inline phys_addr_t virt_to_phys(void * vaddr)
286{
Gabe Blackec516c42012-10-23 18:04:44 +0000287 return (phys_addr_t)(uintptr_t)(vaddr);
Kumar Gala65e43a12008-12-13 17:20:27 -0600288}
289
Simon Glass8a487a42012-10-10 13:12:53 +0000290/*
291 * TODO: The kernel offers some more advanced versions of barriers, it might
292 * have some advantages to use them instead of the simple one here.
293 */
294#define dmb() __asm__ __volatile__ ("" : : : "memory")
295#define __iormb() dmb()
296#define __iowmb() dmb()
297
wdenk2262cfe2002-11-18 00:14:45 +0000298#endif