summaryrefslogtreecommitdiffstats
path: root/drivers/soc/aspeed/aspeed-uart-routing.c
blob: ef8b24fd18518a4db9df7013f43312adf269b060 (plain)
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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2018 Google LLC
 * Copyright (c) 2021 Aspeed Technology Inc.
 */
#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/platform_device.h>

/* register offsets */
#define HICR9	0x98
#define HICRA	0x9c

/* attributes options */
#define UART_ROUTING_IO1	"io1"
#define UART_ROUTING_IO2	"io2"
#define UART_ROUTING_IO3	"io3"
#define UART_ROUTING_IO4	"io4"
#define UART_ROUTING_IO5	"io5"
#define UART_ROUTING_IO6	"io6"
#define UART_ROUTING_IO10	"io10"
#define UART_ROUTING_UART1	"uart1"
#define UART_ROUTING_UART2	"uart2"
#define UART_ROUTING_UART3	"uart3"
#define UART_ROUTING_UART4	"uart4"
#define UART_ROUTING_UART5	"uart5"
#define UART_ROUTING_UART6	"uart6"
#define UART_ROUTING_UART10	"uart10"
#define UART_ROUTING_RES	"reserved"

struct aspeed_uart_routing {
	struct regmap *map;
	struct attribute_group const *attr_grp;
};

struct aspeed_uart_routing_selector {
	struct device_attribute	dev_attr;
	uint8_t reg;
	uint8_t mask;
	uint8_t shift;
	const char *const options[];
};

#define to_routing_selector(_dev_attr)					\
	container_of(_dev_attr, struct aspeed_uart_routing_selector, dev_attr)

static ssize_t aspeed_uart_routing_show(struct device *dev,
					struct device_attribute *attr,
					char *buf);

static ssize_t aspeed_uart_routing_store(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count);

#define ROUTING_ATTR(_name) {					\
	.attr = {.name = _name,					\
		 .mode = VERIFY_OCTAL_PERMISSIONS(0644) },	\
	.show = aspeed_uart_routing_show,			\
	.store = aspeed_uart_routing_store,			\
}

/* routing selector for AST25xx */
static struct aspeed_uart_routing_selector ast2500_io6_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO6),
	.reg = HICR9,
	.shift = 8,
	.mask = 0xf,
	.options = {
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART5,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO5,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_uart5_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART5),
	.reg = HICRA,
	.shift = 28,
	.mask = 0xf,
	.options = {
		    UART_ROUTING_IO5,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_uart4_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART4),
	.reg = HICRA,
	.shift = 25,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_IO6,
		    NULL,
	},
};

static struct aspeed_uart_routing_selector ast2500_uart3_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART3),
	.reg = HICRA,
	.shift = 22,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_uart2_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART2),
	.reg = HICRA,
	.shift = 19,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART1,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_uart1_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART1),
	.reg = HICRA,
	.shift = 16,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_io5_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO5),
	.reg = HICRA,
	.shift = 12,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART5,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_io4_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO4),
	.reg = HICRA,
	.shift = 9,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART5,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_io3_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO3),
	.reg = HICRA,
	.shift = 6,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART5,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_io2_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO2),
	.reg = HICRA,
	.shift = 3,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART5,
		    UART_ROUTING_UART1,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2500_io1_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO1),
	.reg = HICRA,
	.shift = 0,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART5,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO6,
		    NULL,
		    },
};

static struct attribute *ast2500_uart_routing_attrs[] = {
	&ast2500_io6_sel.dev_attr.attr,
	&ast2500_uart5_sel.dev_attr.attr,
	&ast2500_uart4_sel.dev_attr.attr,
	&ast2500_uart3_sel.dev_attr.attr,
	&ast2500_uart2_sel.dev_attr.attr,
	&ast2500_uart1_sel.dev_attr.attr,
	&ast2500_io5_sel.dev_attr.attr,
	&ast2500_io4_sel.dev_attr.attr,
	&ast2500_io3_sel.dev_attr.attr,
	&ast2500_io2_sel.dev_attr.attr,
	&ast2500_io1_sel.dev_attr.attr,
	NULL,
};

static const struct attribute_group ast2500_uart_routing_attr_group = {
	.attrs = ast2500_uart_routing_attrs,
};

/* routing selector for AST26xx */
static struct aspeed_uart_routing_selector ast2600_uart10_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART10),
	.reg = HICR9,
	.shift = 12,
	.mask = 0xf,
	.options = {
		    UART_ROUTING_IO10,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
			UART_ROUTING_RES,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_io10_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO10),
	.reg = HICR9,
	.shift = 8,
	.mask = 0xf,
	.options = {
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
			UART_ROUTING_RES,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
			UART_ROUTING_RES,
		    UART_ROUTING_UART10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_uart4_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART4),
	.reg = HICRA,
	.shift = 25,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_IO10,
		    NULL,
	},
};

static struct aspeed_uart_routing_selector ast2600_uart3_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART3),
	.reg = HICRA,
	.shift = 22,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_uart2_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART2),
	.reg = HICRA,
	.shift = 19,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO1,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART1,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_uart1_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_UART1),
	.reg = HICRA,
	.shift = 16,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_io4_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO4),
	.reg = HICRA,
	.shift = 9,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART10,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_io3_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO3),
	.reg = HICRA,
	.shift = 6,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART10,
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_IO1,
		    UART_ROUTING_IO2,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_io2_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO2),
	.reg = HICRA,
	.shift = 3,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART10,
		    UART_ROUTING_UART1,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct aspeed_uart_routing_selector ast2600_io1_sel = {
	.dev_attr = ROUTING_ATTR(UART_ROUTING_IO1),
	.reg = HICRA,
	.shift = 0,
	.mask = 0x7,
	.options = {
		    UART_ROUTING_UART1,
		    UART_ROUTING_UART2,
		    UART_ROUTING_UART3,
		    UART_ROUTING_UART4,
		    UART_ROUTING_UART10,
		    UART_ROUTING_IO3,
		    UART_ROUTING_IO4,
		    UART_ROUTING_IO10,
		    NULL,
		    },
};

static struct attribute *ast2600_uart_routing_attrs[] = {
	&ast2600_uart10_sel.dev_attr.attr,
	&ast2600_io10_sel.dev_attr.attr,
	&ast2600_uart4_sel.dev_attr.attr,
	&ast2600_uart3_sel.dev_attr.attr,
	&ast2600_uart2_sel.dev_attr.attr,
	&ast2600_uart1_sel.dev_attr.attr,
	&ast2600_io4_sel.dev_attr.attr,
	&ast2600_io3_sel.dev_attr.attr,
	&ast2600_io2_sel.dev_attr.attr,
	&ast2600_io1_sel.dev_attr.attr,
	NULL,
};

static const struct attribute_group ast2600_uart_routing_attr_group = {
	.attrs = ast2600_uart_routing_attrs,
};

static ssize_t aspeed_uart_routing_show(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct aspeed_uart_routing *uart_routing = dev_get_drvdata(dev);
	struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
	int val, pos, len;

	regmap_read(uart_routing->map, sel->reg, &val);
	val = (val >> sel->shift) & sel->mask;

	len = 0;
	for (pos = 0; sel->options[pos] != NULL; ++pos) {
		if (pos == val)
			len += sysfs_emit_at(buf, len, "[%s] ", sel->options[pos]);
		else
			len += sysfs_emit_at(buf, len, "%s ", sel->options[pos]);
	}

	if (val >= pos)
		len += sysfs_emit_at(buf, len, "[unknown(%d)]", val);

	len += sysfs_emit_at(buf, len, "\n");

	return len;
}

static ssize_t aspeed_uart_routing_store(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct aspeed_uart_routing *uart_routing = dev_get_drvdata(dev);
	struct aspeed_uart_routing_selector *sel = to_routing_selector(attr);
	int val;

	val = match_string(sel->options, -1, buf);
	if (val < 0) {
		dev_err(dev, "invalid value \"%s\"\n", buf);
		return -EINVAL;
	}

	regmap_update_bits(uart_routing->map, sel->reg,
			(sel->mask << sel->shift),
			(val & sel->mask) << sel->shift);

	return count;
}

static int aspeed_uart_routing_probe(struct platform_device *pdev)
{
	int rc;
	struct device *dev = &pdev->dev;
	struct aspeed_uart_routing *uart_routing;

	uart_routing = devm_kzalloc(&pdev->dev, sizeof(*uart_routing), GFP_KERNEL);
	if (!uart_routing)
		return -ENOMEM;

	uart_routing->map = syscon_node_to_regmap(dev->parent->of_node);
	if (IS_ERR(uart_routing->map)) {
		dev_err(dev, "cannot get regmap\n");
		return PTR_ERR(uart_routing->map);
	}

	uart_routing->attr_grp = of_device_get_match_data(dev);

	rc = sysfs_create_group(&dev->kobj, uart_routing->attr_grp);
	if (rc < 0)
		return rc;

	dev_set_drvdata(dev, uart_routing);

	dev_info(dev, "module loaded\n");

	return 0;
}

static int aspeed_uart_routing_remove(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct aspeed_uart_routing *uart_routing = platform_get_drvdata(pdev);

	sysfs_remove_group(&dev->kobj, uart_routing->attr_grp);

	return 0;
}

static const struct of_device_id aspeed_uart_routing_table[] = {
	{ .compatible = "aspeed,ast2400-uart-routing",
	  .data = &ast2500_uart_routing_attr_group },
	{ .compatible = "aspeed,ast2500-uart-routing",
	  .data = &ast2500_uart_routing_attr_group },
	{ .compatible = "aspeed,ast2600-uart-routing",
	  .data = &ast2600_uart_routing_attr_group },
	{ },
};

static struct platform_driver aspeed_uart_routing_driver = {
	.driver = {
		.name = "aspeed-uart-routing",
		.of_match_table = aspeed_uart_routing_table,
	},
	.probe = aspeed_uart_routing_probe,
	.remove = aspeed_uart_routing_remove,
};

module_platform_driver(aspeed_uart_routing_driver);

MODULE_AUTHOR("Oskar Senft <osk@google.com>");
MODULE_AUTHOR("Chia-Wei Wang <chiawei_wang@aspeedtech.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Driver to configure Aspeed UART routing");