aboutsummaryrefslogtreecommitdiffstats
path: root/arch/alpha/kernel/io.c
blob: 19c5875ab398f930040d0ac8fda2071c9af523a8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
/*
 * Alpha IO and memory functions.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/module.h>
#include <asm/io.h>

/* Out-of-line versions of the i/o routines that redirect into the 
   platform-specific version.  Note that "platform-specific" may mean
   "generic", which bumps through the machine vector.  */

unsigned int
ioread8(void __iomem *addr)
{
	unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
	mb();
	return ret;
}

unsigned int ioread16(void __iomem *addr)
{
	unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
	mb();
	return ret;
}

unsigned int ioread32(void __iomem *addr)
{
	unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
	mb();
	return ret;
}

void iowrite8(u8 b, void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
	mb();
}

void iowrite16(u16 b, void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
	mb();
}

void iowrite32(u32 b, void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
	mb();
}

EXPORT_SYMBOL(ioread8);
EXPORT_SYMBOL(ioread16);
EXPORT_SYMBOL(ioread32);
EXPORT_SYMBOL(iowrite8);
EXPORT_SYMBOL(iowrite16);
EXPORT_SYMBOL(iowrite32);

u8 inb(unsigned long port)
{
	return ioread8(ioport_map(port, 1));
}

u16 inw(unsigned long port)
{
	return ioread16(ioport_map(port, 2));
}

u32 inl(unsigned long port)
{
	return ioread32(ioport_map(port, 4));
}

void outb(u8 b, unsigned long port)
{
	iowrite8(b, ioport_map(port, 1));
}

void outw(u16 b, unsigned long port)
{
	iowrite16(b, ioport_map(port, 2));
}

void outl(u32 b, unsigned long port)
{
	iowrite32(b, ioport_map(port, 4));
}

EXPORT_SYMBOL(inb);
EXPORT_SYMBOL(inw);
EXPORT_SYMBOL(inl);
EXPORT_SYMBOL(outb);
EXPORT_SYMBOL(outw);
EXPORT_SYMBOL(outl);

u8 __raw_readb(const volatile void __iomem *addr)
{
	return IO_CONCAT(__IO_PREFIX,readb)(addr);
}

u16 __raw_readw(const volatile void __iomem *addr)
{
	return IO_CONCAT(__IO_PREFIX,readw)(addr);
}

u32 __raw_readl(const volatile void __iomem *addr)
{
	return IO_CONCAT(__IO_PREFIX,readl)(addr);
}

u64 __raw_readq(const volatile void __iomem *addr)
{
	return IO_CONCAT(__IO_PREFIX,readq)(addr);
}

void __raw_writeb(u8 b, volatile void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
}

void __raw_writew(u16 b, volatile void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,writew)(b, addr);
}

void __raw_writel(u32 b, volatile void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,writel)(b, addr);
}

void __raw_writeq(u64 b, volatile void __iomem *addr)
{
	IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
}

EXPORT_SYMBOL(__raw_readb); 
EXPORT_SYMBOL(__raw_readw); 
EXPORT_SYMBOL(__raw_readl); 
EXPORT_SYMBOL(__raw_readq); 
EXPORT_SYMBOL(__raw_writeb); 
EXPORT_SYMBOL(__raw_writew); 
EXPORT_SYMBOL(__raw_writel); 
EXPORT_SYMBOL(__raw_writeq); 

u8 readb(const volatile void __iomem *addr)
{
	u8 ret = __raw_readb(addr);
	mb();
	return ret;
}

u16 readw(const volatile void __iomem *addr)
{
	u16 ret = __raw_readw(addr);
	mb();
	return ret;
}

u32 readl(const volatile void __iomem *addr)
{
	u32 ret = __raw_readl(addr);
	mb();
	return ret;
}

u64 readq(const volatile void __iomem *addr)
{
	u64 ret = __raw_readq(addr);
	mb();
	return ret;
}

void writeb(u8 b, volatile void __iomem *addr)
{
	__raw_writeb(b, addr);
	mb();
}

void writew(u16 b, volatile void __iomem *addr)
{
	__raw_writew(b, addr);
	mb();
}

void writel(u32 b, volatile void __iomem *addr)
{
	__raw_writel(b, addr);
	mb();
}

void writeq(u64 b, volatile void __iomem *addr)
{
	__raw_writeq(b, addr);
	mb();
}

EXPORT_SYMBOL(readb);
EXPORT_SYMBOL(readw);
EXPORT_SYMBOL(readl);
EXPORT_SYMBOL(readq);
EXPORT_SYMBOL(writeb);
EXPORT_SYMBOL(writew);
EXPORT_SYMBOL(writel);
EXPORT_SYMBOL(writeq);


/*
 * Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
 */
void ioread8_rep(void __iomem *port, void *dst, unsigned long count)
{
	while ((unsigned long)dst & 0x3) {
		if (!count)
			return;
		count--;
		*(unsigned char *)dst = ioread8(port);
		dst += 1;
	}

	while (count >= 4) {
		unsigned int w;
		count -= 4;
		w = ioread8(port);
		w |= ioread8(port) << 8;
		w |= ioread8(port) << 16;
		w |= ioread8(port) << 24;
		*(unsigned int *)dst = w;
		dst += 4;
	}

	while (count) {
		--count;
		*(unsigned char *)dst = ioread8(port);
		dst += 1;
	}
}

void insb(unsigned long port, void *dst, unsigned long count)
{
	ioread8_rep(ioport_map(port, 1), dst, count);
}

EXPORT_SYMBOL(ioread8_rep);
EXPORT_SYMBOL(insb);

/*
 * Read COUNT 16-bit words from port PORT into memory starting at
 * SRC.  SRC must be at least short aligned.  This is used by the
 * IDE driver to read disk sectors.  Performance is important, but
 * the interfaces seems to be slow: just using the inlined version
 * of the inw() breaks things.
 */
void ioread16_rep(void __iomem *port, void *dst, unsigned long count)
{
	if (unlikely((unsigned long)dst & 0x3)) {
		if (!count)
			return;
		BUG_ON((unsigned long)dst & 0x1);
		count--;
		*(unsigned short *)dst = ioread16(port);
		dst += 2;
	}

	while (count >= 2) {
		unsigned int w;
		count -= 2;
		w = ioread16(port);
		w |= ioread16(port) << 16;
		*(unsigned int *)dst = w;
		dst += 4;
	}

	if (count) {
		*(unsigned short*)dst = ioread16(port);
	}
}

void insw(unsigned long port, void *dst, unsigned long count)
{
	ioread16_rep(ioport_map(port, 2), dst, count);
}

EXPORT_SYMBOL(ioread16_rep);
EXPORT_SYMBOL(insw);


/*
 * Read COUNT 32-bit words from port PORT into memory starting at
 * SRC. Now works with any alignment in SRC. Performance is important,
 * but the interfaces seems to be slow: just using the inlined version
 * of the inl() breaks things.
 */
void ioread32_rep(void __iomem *port, void *dst, unsigned long count)
{
	if (unlikely((unsigned long)dst & 0x3)) {
		while (count--) {
			struct S { int x __attribute__((packed)); };
			((struct S *)dst)->x = ioread32(port);
			dst += 4;
		}
	} else {
		/* Buffer 32-bit aligned.  */
		while (count--) {
			*(unsigned int *)dst = ioread32(port);
			dst += 4;
		}
	}
}

void insl(unsigned long port, void *dst, unsigned long count)
{
	ioread32_rep(ioport_map(port, 4), dst, count);
}

EXPORT_SYMBOL(ioread32_rep);
EXPORT_SYMBOL(insl);


/*
 * Like insb but in the opposite direction.
 * Don't worry as much about doing aligned memory transfers:
 * doing byte reads the "slow" way isn't nearly as slow as
 * doing byte writes the slow way (no r-m-w cycle).
 */
void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
{
	const unsigned char *src = xsrc;
	while (count--)
		iowrite8(*src++, port);
}

void outsb(unsigned long port, const void *src, unsigned long count)
{
	iowrite8_rep(ioport_map(port, 1), src, count);
}

EXPORT_SYMBOL(iowrite8_rep);
EXPORT_SYMBOL(outsb);


/*
 * Like insw but in the opposite direction.  This is used by the IDE
 * driver to write disk sectors.  Performance is important, but the
 * interfaces seems to be slow: just using the inlined version of the
 * outw() breaks things.
 */
void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
{
	if (unlikely((unsigned long)src & 0x3)) {
		if (!count)
			return;
		BUG_ON((unsigned long)src & 0x1);
		iowrite16(*(unsigned short *)src, port);
		src += 2;
		--count;
	}

	while (count >= 2) {
		unsigned int w;
		count -= 2;
		w = *(unsigned int *)src;
		src += 4;
		iowrite16(w >>  0, port);
		iowrite16(w >> 16, port);
	}

	if (count) {
		iowrite16(*(unsigned short *)src, port);
	}
}

void outsw(unsigned long port, const void *src, unsigned long count)
{
	iowrite16_rep(ioport_map(port, 2), src, count);
}

EXPORT_SYMBOL(iowrite16_rep);
EXPORT_SYMBOL(outsw);


/*
 * Like insl but in the opposite direction.  This is used by the IDE
 * driver to write disk sectors.  Works with any alignment in SRC.
 * Performance is important, but the interfaces seems to be slow:
 * just using the inlined version of the outl() breaks things.
 */
void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
{
	if (unlikely((unsigned long)src & 0x3)) {
		while (count--) {
			struct S { int x __attribute__((packed)); };
			iowrite32(((struct S *)src)->x, port);
			src += 4;
		}
	} else {
		/* Buffer 32-bit aligned.  */
		while (count--) {
			iowrite32(*(unsigned int *)src, port);
			src += 4;
		}
	}
}

void outsl(unsigned long port, const void *src, unsigned long count)
{
	iowrite32_rep(ioport_map(port, 4), src, count);
}

EXPORT_SYMBOL(iowrite32_rep);
EXPORT_SYMBOL(outsl);


/*
 * Copy data from IO memory space to "real" memory space.
 * This needs to be optimized.
 */
void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
{
	/* Optimize co-aligned transfers.  Everything else gets handled
	   a byte at a time. */

	if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
		count -= 8;
		do {
			*(u64 *)to = __raw_readq(from);
			count -= 8;
			to += 8;
			from += 8;
		} while (count >= 0);
		count += 8;
	}

	if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
		count -= 4;
		do {
			*(u32 *)to = __raw_readl(from);
			count -= 4;
			to += 4;
			from += 4;
		} while (count >= 0);
		count += 4;
	}

	if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
		count -= 2;
		do {
			*(u16 *)to = __raw_readw(from);
			count -= 2;
			to += 2;
			from += 2;
		} while (count >= 0);
		count += 2;
	}

	while (count > 0) {
		*(u8 *) to = __raw_readb(from);
		count--;
		to++;
		from++;
	}
	mb();
}

EXPORT_SYMBOL(memcpy_fromio);


/*
 * Copy data from "real" memory space to IO memory space.
 * This needs to be optimized.
 */
void memcpy_toio(volatile void __iomem *to, const void *from, long count)
{
	/* Optimize co-aligned transfers.  Everything else gets handled
	   a byte at a time. */
	/* FIXME -- align FROM.  */

	if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
		count -= 8;
		do {
			__raw_writeq(*(const u64 *)from, to);
			count -= 8;
			to += 8;
			from += 8;
		} while (count >= 0);
		count += 8;
	}

	if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
		count -= 4;
		do {
			__raw_writel(*(const u32 *)from, to);
			count -= 4;
			to += 4;
			from += 4;
		} while (count >= 0);
		count += 4;
	}

	if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
		count -= 2;
		do {
			__raw_writew(*(const u16 *)from, to);
			count -= 2;
			to += 2;
			from += 2;
		} while (count >= 0);
		count += 2;
	}

	while (count > 0) {
		__raw_writeb(*(const u8 *) from, to);
		count--;
		to++;
		from++;
	}
	mb();
}

EXPORT_SYMBOL(memcpy_toio);


/*
 * "memset" on IO memory space.
 */
void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
{
	/* Handle any initial odd byte */
	if (count > 0 && ((u64)to & 1)) {
		__raw_writeb(c, to);
		to++;
		count--;
	}

	/* Handle any initial odd halfword */
	if (count >= 2 && ((u64)to & 2)) {
		__raw_writew(c, to);
		to += 2;
		count -= 2;
	}

	/* Handle any initial odd word */
	if (count >= 4 && ((u64)to & 4)) {
		__raw_writel(c, to);
		to += 4;
		count -= 4;
	}

	/* Handle all full-sized quadwords: we're aligned
	   (or have a small count) */
	count -= 8;
	if (count >= 0) {
		do {
			__raw_writeq(c, to);
			to += 8;
			count -= 8;
		} while (count >= 0);
	}
	count += 8;

	/* The tail is word-aligned if we still have count >= 4 */
	if (count >= 4) {
		__raw_writel(c, to);
		to += 4;
		count -= 4;
	}

	/* The tail is half-word aligned if we have count >= 2 */
	if (count >= 2) {
		__raw_writew(c, to);
		to += 2;
		count -= 2;
	}

	/* And finally, one last byte.. */
	if (count) {
		__raw_writeb(c, to);
	}
	mb();
}

EXPORT_SYMBOL(_memset_c_io);

/* A version of memcpy used by the vga console routines to move data around
   arbitrarily between screen and main memory.  */

void
scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
{
	const u16 __iomem *ios = (const u16 __iomem *) s;
	u16 __iomem *iod = (u16 __iomem *) d;
	int s_isio = __is_ioaddr(s);
	int d_isio = __is_ioaddr(d);

	if (s_isio) {
		if (d_isio) {
			/* FIXME: Should handle unaligned ops and
			   operation widening.  */

			count /= 2;
			while (count--) {
				u16 tmp = __raw_readw(ios++);
				__raw_writew(tmp, iod++);
			}
		}
		else
			memcpy_fromio(d, ios, count);
	} else {
		if (d_isio)
			memcpy_toio(iod, s, count);
		else
			memcpy(d, s, count);
	}
}

EXPORT_SYMBOL(scr_memcpyw);

void __iomem *ioport_map(unsigned long port, unsigned int size)
{
	return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
}

void ioport_unmap(void __iomem *addr)
{
}

EXPORT_SYMBOL(ioport_map);
EXPORT_SYMBOL(ioport_unmap);