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gerrit-public.fairphone.software / kernel / msm-4.9 / fa15b1f6be4764bfeb29b0cf74442ea6dbb2ec9d / . / include / asm-arm26 / io.h
blob: 02f94d88a1247bba02ec6dd9e0f61967151d4ffc [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1/*
2 * linux/include/asm-arm/io.h
3 *
4 * Copyright (C) 1996-2000 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * Modifications:
11 * 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
12 * constant addresses and variable addresses.
13 * 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
14 * specific IO header files.
15 * 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
16 * 04-Apr-1999 PJB Added check_signature.
17 * 12-Dec-1999 RMK More cleanups
18 * 18-Jun-2000 RMK Removed virt_to_* and friends definitions
19 */
20#ifndef __ASM_ARM_IO_H
21#define __ASM_ARM_IO_H
22
23#ifdef __KERNEL__
24
25#include <linux/config.h>
26#include <linux/types.h>
27#include <asm/byteorder.h>
28#include <asm/memory.h>
29#include <asm/hardware.h>
30
31/*
32 * Generic IO read/write. These perform native-endian accesses. Note
33 * that some architectures will want to re-define __raw_{read,write}w.
34 */
35extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
36extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
37extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
38
39extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
40extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
41extern void __raw_readsl(unsigned int addr, void *data, int longlen);
42
43#define __raw_writeb(v,a) (*(volatile unsigned char *)(a) = (v))
44#define __raw_writew(v,a) (*(volatile unsigned short *)(a) = (v))
45#define __raw_writel(v,a) (*(volatile unsigned int *)(a) = (v))
46
47#define __raw_readb(a) (*(volatile unsigned char *)(a))
48#define __raw_readw(a) (*(volatile unsigned short *)(a))
49#define __raw_readl(a) (*(volatile unsigned int *)(a))
50
51
52/*
53 * Bad read/write accesses...
54 */
55extern void __readwrite_bug(const char *fn);
56
57/*
58 * Now, pick up the machine-defined IO definitions
59 */
60
61#define IO_SPACE_LIMIT 0xffffffff
62
63/*
64 * GCC is totally crap at loading/storing data. We try to persuade it
65 * to do the right thing by using these whereever possible instead of
66 * the above.
67 */
68#define __arch_base_getb(b,o) \
69 ({ \
70 unsigned int v, r = (b); \
71 __asm__ __volatile__( \
72 "ldrb %0, [%1, %2]" \
73 : "=r" (v) \
74 : "r" (r), "Ir" (o)); \
75 v; \
76 })
77
78#define __arch_base_getl(b,o) \
79 ({ \
80 unsigned int v, r = (b); \
81 __asm__ __volatile__( \
82 "ldr %0, [%1, %2]" \
83 : "=r" (v) \
84 : "r" (r), "Ir" (o)); \
85 v; \
86 })
87
88#define __arch_base_putb(v,b,o) \
89 ({ \
90 unsigned int r = (b); \
91 __asm__ __volatile__( \
92 "strb %0, [%1, %2]" \
93 : \
94 : "r" (v), "r" (r), "Ir" (o)); \
95 })
96
97#define __arch_base_putl(v,b,o) \
98 ({ \
99 unsigned int r = (b); \
100 __asm__ __volatile__( \
101 "str %0, [%1, %2]" \
102 : \
103 : "r" (v), "r" (r), "Ir" (o)); \
104 })
105
106/*
107 * We use two different types of addressing - PC style addresses, and ARM
108 * addresses. PC style accesses the PC hardware with the normal PC IO
109 * addresses, eg 0x3f8 for serial#1. ARM addresses are 0x80000000+
110 * and are translated to the start of IO. Note that all addresses are
111 * shifted left!
112 */
113#define __PORT_PCIO(x) (!((x) & 0x80000000))
114
115/*
116 * Dynamic IO functions - let the compiler
117 * optimize the expressions
118 */
119static inline void __outb (unsigned int value, unsigned int port)
120{
121 unsigned long temp;
122 __asm__ __volatile__(
123 "tst %2, #0x80000000\n\t"
124 "mov %0, %4\n\t"
125 "addeq %0, %0, %3\n\t"
126 "strb %1, [%0, %2, lsl #2] @ outb"
127 : "=&r" (temp)
128 : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
129 : "cc");
130}
131
132static inline void __outw (unsigned int value, unsigned int port)
133{
134 unsigned long temp;
135 __asm__ __volatile__(
136 "tst %2, #0x80000000\n\t"
137 "mov %0, %4\n\t"
138 "addeq %0, %0, %3\n\t"
139 "str %1, [%0, %2, lsl #2] @ outw"
140 : "=&r" (temp)
141 : "r" (value|value<<16), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
142 : "cc");
143}
144
145static inline void __outl (unsigned int value, unsigned int port)
146{
147 unsigned long temp;
148 __asm__ __volatile__(
149 "tst %2, #0x80000000\n\t"
150 "mov %0, %4\n\t"
151 "addeq %0, %0, %3\n\t"
152 "str %1, [%0, %2, lsl #2] @ outl"
153 : "=&r" (temp)
154 : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
155 : "cc");
156}
157
158#define DECLARE_DYN_IN(sz,fnsuffix,instr) \
159static inline unsigned sz __in##fnsuffix (unsigned int port) \
160{ \
161 unsigned long temp, value; \
162 __asm__ __volatile__( \
163 "tst %2, #0x80000000\n\t" \
164 "mov %0, %4\n\t" \
165 "addeq %0, %0, %3\n\t" \
166 "ldr" instr " %1, [%0, %2, lsl #2] @ in" #fnsuffix \
167 : "=&r" (temp), "=r" (value) \
168 : "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE) \
169 : "cc"); \
170 return (unsigned sz)value; \
171}
172
173static inline unsigned int __ioaddr (unsigned int port) \
174{ \
175 if (__PORT_PCIO(port)) \
176 return (unsigned int)(PCIO_BASE + (port << 2)); \
177 else \
178 return (unsigned int)(IO_BASE + (port << 2)); \
179}
180
181#define DECLARE_IO(sz,fnsuffix,instr) \
182 DECLARE_DYN_IN(sz,fnsuffix,instr)
183
184DECLARE_IO(char,b,"b")
185DECLARE_IO(short,w,"")
186DECLARE_IO(int,l,"")
187
188#undef DECLARE_IO
189#undef DECLARE_DYN_IN
190
191/*
192 * Constant address IO functions
193 *
194 * These have to be macros for the 'J' constraint to work -
195 * +/-4096 immediate operand.
196 */
197#define __outbc(value,port) \
198({ \
199 if (__PORT_PCIO((port))) \
200 __asm__ __volatile__( \
201 "strb %0, [%1, %2] @ outbc" \
202 : : "r" (value), "r" (PCIO_BASE), "Jr" ((port) << 2)); \
203 else \
204 __asm__ __volatile__( \
205 "strb %0, [%1, %2] @ outbc" \
206 : : "r" (value), "r" (IO_BASE), "r" ((port) << 2)); \
207})
208
209#define __inbc(port) \
210({ \
211 unsigned char result; \
212 if (__PORT_PCIO((port))) \
213 __asm__ __volatile__( \
214 "ldrb %0, [%1, %2] @ inbc" \
215 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2)); \
216 else \
217 __asm__ __volatile__( \
218 "ldrb %0, [%1, %2] @ inbc" \
219 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2)); \
220 result; \
221})
222
223#define __outwc(value,port) \
224({ \
225 unsigned long v = value; \
226 if (__PORT_PCIO((port))) \
227 __asm__ __volatile__( \
228 "str %0, [%1, %2] @ outwc" \
229 : : "r" (v|v<<16), "r" (PCIO_BASE), "Jr" ((port) << 2)); \
230 else \
231 __asm__ __volatile__( \
232 "str %0, [%1, %2] @ outwc" \
233 : : "r" (v|v<<16), "r" (IO_BASE), "r" ((port) << 2)); \
234})
235
236#define __inwc(port) \
237({ \
238 unsigned short result; \
239 if (__PORT_PCIO((port))) \
240 __asm__ __volatile__( \
241 "ldr %0, [%1, %2] @ inwc" \
242 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2)); \
243 else \
244 __asm__ __volatile__( \
245 "ldr %0, [%1, %2] @ inwc" \
246 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2)); \
247 result & 0xffff; \
248})
249
250#define __outlc(value,port) \
251({ \
252 unsigned long v = value; \
253 if (__PORT_PCIO((port))) \
254 __asm__ __volatile__( \
255 "str %0, [%1, %2] @ outlc" \
256 : : "r" (v), "r" (PCIO_BASE), "Jr" ((port) << 2)); \
257 else \
258 __asm__ __volatile__( \
259 "str %0, [%1, %2] @ outlc" \
260 : : "r" (v), "r" (IO_BASE), "r" ((port) << 2)); \
261})
262
263#define __inlc(port) \
264({ \
265 unsigned long result; \
266 if (__PORT_PCIO((port))) \
267 __asm__ __volatile__( \
268 "ldr %0, [%1, %2] @ inlc" \
269 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2)); \
270 else \
271 __asm__ __volatile__( \
272 "ldr %0, [%1, %2] @ inlc" \
273 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2)); \
274 result; \
275})
276
277#define __ioaddrc(port) \
278({ \
279 unsigned long addr; \
280 if (__PORT_PCIO((port))) \
281 addr = PCIO_BASE + ((port) << 2); \
282 else \
283 addr = IO_BASE + ((port) << 2); \
284 addr; \
285})
286
287#define inb(p) (__builtin_constant_p((p)) ? __inbc(p) : __inb(p))
288#define inw(p) (__builtin_constant_p((p)) ? __inwc(p) : __inw(p))
289#define inl(p) (__builtin_constant_p((p)) ? __inlc(p) : __inl(p))
290#define outb(v,p) (__builtin_constant_p((p)) ? __outbc(v,p) : __outb(v,p))
291#define outw(v,p) (__builtin_constant_p((p)) ? __outwc(v,p) : __outw(v,p))
292#define outl(v,p) (__builtin_constant_p((p)) ? __outlc(v,p) : __outl(v,p))
293#define __ioaddr(p) (__builtin_constant_p((p)) ? __ioaddr(p) : __ioaddrc(p))
294
295/* JMA 18.02.03 added sb,sl from arm/io.h, changing io to ioaddr */
296
297#define outsb(p,d,l) __raw_writesb(__ioaddr(p),d,l)
298#define outsw(p,d,l) __raw_writesw(__ioaddr(p),d,l)
299#define outsl(p,d,l) __raw_writesl(__ioaddr(p),d,l)
300
301#define insb(p,d,l) __raw_readsb(__ioaddr(p),d,l)
302#define insw(p,d,l) __raw_readsw(__ioaddr(p),d,l)
303#define insl(p,d,l) __raw_readsl(__ioaddr(p),d,l)
304
305#define insw(p,d,l) __raw_readsw(__ioaddr(p),d,l)
306#define outsw(p,d,l) __raw_writesw(__ioaddr(p),d,l)
307
308#define readb(c) (__readwrite_bug("readb"),0)
309#define readw(c) (__readwrite_bug("readw"),0)
310#define readl(c) (__readwrite_bug("readl"),0)
311#define readb_relaxed(addr) readb(addr)
312#define readw_relaxed(addr) readw(addr)
313#define readl_relaxed(addr) readl(addr)
314#define writeb(v,c) __readwrite_bug("writeb")
315#define writew(v,c) __readwrite_bug("writew")
316#define writel(v,c) __readwrite_bug("writel")
317
318#define readsw(p,d,l) (__readwrite_bug("readsw"),0)
319#define readsl(p,d,l) (__readwrite_bug("readsl"),0)
320#define writesw(p,d,l) __readwrite_bug("writesw")
321#define writesl(p,d,l) __readwrite_bug("writesl")
322
323#define mmiowb()
324
325/* the following macro is depreciated */
326#define ioaddr(port) __ioaddr((port))
327
328/*
329 * No ioremap support here.
330 */
331#define __arch_ioremap(c,s,f,a) ((void *)(c))
332#define __arch_iounmap(c) do { } while (0)
333
334
335#if defined(__arch_putb) || defined(__arch_putw) || defined(__arch_putl) || \
336 defined(__arch_getb) || defined(__arch_getw) || defined(__arch_getl)
337#warning machine class uses old __arch_putw or __arch_getw
338#endif
339
340/*
341 * IO port access primitives
342 * -------------------------
343 *
344 * The ARM doesn't have special IO access instructions; all IO is memory
345 * mapped. Note that these are defined to perform little endian accesses
346 * only. Their primary purpose is to access PCI and ISA peripherals.
347 *
348 * Note that for a big endian machine, this implies that the following
349 * big endian mode connectivity is in place, as described by numerious
350 * ARM documents:
351 *
352 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
353 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
354 *
355 * The machine specific io.h include defines __io to translate an "IO"
356 * address to a memory address.
357 *
358 * Note that we prevent GCC re-ordering or caching values in expressions
359 * by introducing sequence points into the in*() definitions. Note that
360 * __raw_* do not guarantee this behaviour.
361 */
362/*
363#define outsb(p,d,l) __raw_writesb(__io(p),d,l)
364#define outsw(p,d,l) __raw_writesw(__io(p),d,l)
365
366#define insb(p,d,l) __raw_readsb(__io(p),d,l)
367#define insw(p,d,l) __raw_readsw(__io(p),d,l)
368*/
369#define outb_p(val,port) outb((val),(port))
370#define outw_p(val,port) outw((val),(port))
371#define inb_p(port) inb((port))
372#define inw_p(port) inw((port))
373#define inl_p(port) inl((port))
374
375#define outsb_p(port,from,len) outsb(port,from,len)
376#define outsw_p(port,from,len) outsw(port,from,len)
377#define insb_p(port,to,len) insb(port,to,len)
378#define insw_p(port,to,len) insw(port,to,len)
379
380/*
381 * String version of IO memory access ops:
382 */
383extern void _memcpy_fromio(void *, unsigned long, size_t);
384extern void _memcpy_toio(unsigned long, const void *, size_t);
385extern void _memset_io(unsigned long, int, size_t);
386
387/*
388 * ioremap and friends.
389 *
390 * ioremap takes a PCI memory address, as specified in
391 * Documentation/IO-mapping.txt.
392 */
393extern void * __ioremap(unsigned long, size_t, unsigned long, unsigned long);
394extern void __iounmap(void *addr);
395
396#ifndef __arch_ioremap
397#define ioremap(cookie,size) __ioremap(cookie,size,0,1)
398#define ioremap_nocache(cookie,size) __ioremap(cookie,size,0,1)
399#define iounmap(cookie) __iounmap(cookie)
400#else
401#define ioremap(cookie,size) __arch_ioremap((cookie),(size),0,1)
402#define ioremap_nocache(cookie,size) __arch_ioremap((cookie),(size),0,1)
403#define iounmap(cookie) __arch_iounmap(cookie)
404#endif
405
406/*
407 * DMA-consistent mapping functions. These allocate/free a region of
408 * uncached, unwrite-buffered mapped memory space for use with DMA
409 * devices. This is the "generic" version. The PCI specific version
410 * is in pci.h
411 */
412extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
413extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
414extern void consistent_sync(void *vaddr, size_t size, int rw);
415
416/*
417 * can the hardware map this into one segment or not, given no other
418 * constraints.
419 */
420#define BIOVEC_MERGEABLE(vec1, vec2) \
421 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
422
423/*
424 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
425 * access
426 */
427#define xlate_dev_mem_ptr(p) __va(p)
428
429/*
430 * Convert a virtual cached pointer to an uncached pointer
431 */
432#define xlate_dev_kmem_ptr(p) p
433
434#endif /* __KERNEL__ */
435#endif /* __ASM_ARM_IO_H */