summaryrefslogtreecommitdiff
path: root/drivers/video/exynos/exynos_mipi_dsi.c
blob: 4a17cdccef3466f616178688436b39a856ded206 (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
604
605
606
607
608
609
610
/* linux/drivers/video/exynos/exynos_mipi_dsi.c
 *
 * Samsung SoC MIPI-DSIM driver.
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd
 *
 * InKi Dae, <inki.dae@samsung.com>
 * Donghwa Lee, <dh09.lee@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
*/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/ctype.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/memory.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kthread.h>
#include <linux/notifier.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>

#include <video/exynos_mipi_dsim.h>

#include <plat/fb.h>

#include "exynos_mipi_dsi_common.h"
#include "exynos_mipi_dsi_lowlevel.h"

struct mipi_dsim_ddi {
	int				bus_id;
	struct list_head		list;
	struct mipi_dsim_lcd_device	*dsim_lcd_dev;
	struct mipi_dsim_lcd_driver	*dsim_lcd_drv;
};

static LIST_HEAD(dsim_ddi_list);

static DEFINE_MUTEX(mipi_dsim_lock);

static struct mipi_dsim_platform_data *to_dsim_plat(struct platform_device
							*pdev)
{
	return pdev->dev.platform_data;
}

static struct regulator_bulk_data supplies[] = {
	{ .supply = "vdd11", },
	{ .supply = "vdd18", },
};

static int exynos_mipi_regulator_enable(struct mipi_dsim_device *dsim)
{
	int ret;

	mutex_lock(&dsim->lock);
	ret = regulator_bulk_enable(ARRAY_SIZE(supplies), supplies);
	mutex_unlock(&dsim->lock);

	return ret;
}

static int exynos_mipi_regulator_disable(struct mipi_dsim_device *dsim)
{
	int ret;

	mutex_lock(&dsim->lock);
	ret = regulator_bulk_disable(ARRAY_SIZE(supplies), supplies);
	mutex_unlock(&dsim->lock);

	return ret;
}

/* update all register settings to MIPI DSI controller. */
static void exynos_mipi_update_cfg(struct mipi_dsim_device *dsim)
{
	/*
	 * data from Display controller(FIMD) is not transferred in video mode
	 * but in case of command mode, all settings is not updated to
	 * registers.
	 */
	exynos_mipi_dsi_stand_by(dsim, 0);

	exynos_mipi_dsi_init_dsim(dsim);
	exynos_mipi_dsi_init_link(dsim);

	exynos_mipi_dsi_set_hs_enable(dsim);

	/* set display timing. */
	exynos_mipi_dsi_set_display_mode(dsim, dsim->dsim_config);

	exynos_mipi_dsi_init_interrupt(dsim);

	/*
	 * data from Display controller(FIMD) is transferred in video mode
	 * but in case of command mode, all settings are updated to registers.
	 */
	exynos_mipi_dsi_stand_by(dsim, 1);
}

static int exynos_mipi_dsi_early_blank_mode(struct mipi_dsim_device *dsim,
		int power)
{
	struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
	struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;

	switch (power) {
	case FB_BLANK_POWERDOWN:
		if (dsim->suspended)
			return 0;

		if (client_drv && client_drv->suspend)
			client_drv->suspend(client_dev);

		clk_disable(dsim->clock);

		exynos_mipi_regulator_disable(dsim);

		dsim->suspended = true;

		break;
	default:
		break;
	}

	return 0;
}

static int exynos_mipi_dsi_blank_mode(struct mipi_dsim_device *dsim, int power)
{
	struct platform_device *pdev = to_platform_device(dsim->dev);
	struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
	struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;

	switch (power) {
	case FB_BLANK_UNBLANK:
		if (!dsim->suspended)
			return 0;

		/* lcd panel power on. */
		if (client_drv && client_drv->power_on)
			client_drv->power_on(client_dev, 1);

		exynos_mipi_regulator_enable(dsim);

		/* enable MIPI-DSI PHY. */
		if (dsim->pd->phy_enable)
			dsim->pd->phy_enable(pdev, true);

		clk_enable(dsim->clock);

		exynos_mipi_update_cfg(dsim);

		/* set lcd panel sequence commands. */
		if (client_drv && client_drv->set_sequence)
			client_drv->set_sequence(client_dev);

		dsim->suspended = false;

		break;
	case FB_BLANK_NORMAL:
		/* TODO. */
		break;
	default:
		break;
	}

	return 0;
}

int exynos_mipi_dsi_register_lcd_device(struct mipi_dsim_lcd_device *lcd_dev)
{
	struct mipi_dsim_ddi *dsim_ddi;

	if (!lcd_dev->name) {
		pr_err("dsim_lcd_device name is NULL.\n");
		return -EFAULT;
	}

	dsim_ddi = kzalloc(sizeof(struct mipi_dsim_ddi), GFP_KERNEL);
	if (!dsim_ddi) {
		pr_err("failed to allocate dsim_ddi object.\n");
		return -ENOMEM;
	}

	dsim_ddi->dsim_lcd_dev = lcd_dev;

	mutex_lock(&mipi_dsim_lock);
	list_add_tail(&dsim_ddi->list, &dsim_ddi_list);
	mutex_unlock(&mipi_dsim_lock);

	return 0;
}

static struct mipi_dsim_ddi *exynos_mipi_dsi_find_lcd_device(
					struct mipi_dsim_lcd_driver *lcd_drv)
{
	struct mipi_dsim_ddi *dsim_ddi, *next;
	struct mipi_dsim_lcd_device *lcd_dev;

	mutex_lock(&mipi_dsim_lock);

	list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
		if (!dsim_ddi)
			goto out;

		lcd_dev = dsim_ddi->dsim_lcd_dev;
		if (!lcd_dev)
			continue;

		if ((strcmp(lcd_drv->name, lcd_dev->name)) == 0) {
			/**
			 * bus_id would be used to identify
			 * connected bus.
			 */
			dsim_ddi->bus_id = lcd_dev->bus_id;
			mutex_unlock(&mipi_dsim_lock);

			return dsim_ddi;
		}

		list_del(&dsim_ddi->list);
		kfree(dsim_ddi);
	}

out:
	mutex_unlock(&mipi_dsim_lock);

	return NULL;
}

int exynos_mipi_dsi_register_lcd_driver(struct mipi_dsim_lcd_driver *lcd_drv)
{
	struct mipi_dsim_ddi *dsim_ddi;

	if (!lcd_drv->name) {
		pr_err("dsim_lcd_driver name is NULL.\n");
		return -EFAULT;
	}

	dsim_ddi = exynos_mipi_dsi_find_lcd_device(lcd_drv);
	if (!dsim_ddi) {
		pr_err("mipi_dsim_ddi object not found.\n");
		return -EFAULT;
	}

	dsim_ddi->dsim_lcd_drv = lcd_drv;

	pr_info("registered panel driver(%s) to mipi-dsi driver.\n",
		lcd_drv->name);

	return 0;

}

static struct mipi_dsim_ddi *exynos_mipi_dsi_bind_lcd_ddi(
						struct mipi_dsim_device *dsim,
						const char *name)
{
	struct mipi_dsim_ddi *dsim_ddi, *next;
	struct mipi_dsim_lcd_driver *lcd_drv;
	struct mipi_dsim_lcd_device *lcd_dev;
	int ret;

	mutex_lock(&dsim->lock);

	list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
		lcd_drv = dsim_ddi->dsim_lcd_drv;
		lcd_dev = dsim_ddi->dsim_lcd_dev;
		if (!lcd_drv || !lcd_dev ||
			(dsim->id != dsim_ddi->bus_id))
				continue;

		dev_dbg(dsim->dev, "lcd_drv->id = %d, lcd_dev->id = %d\n",
				lcd_drv->id, lcd_dev->id);
		dev_dbg(dsim->dev, "lcd_dev->bus_id = %d, dsim->id = %d\n",
				lcd_dev->bus_id, dsim->id);

		if ((strcmp(lcd_drv->name, name) == 0)) {
			lcd_dev->master = dsim;

			lcd_dev->dev.parent = dsim->dev;
			dev_set_name(&lcd_dev->dev, "%s", lcd_drv->name);

			ret = device_register(&lcd_dev->dev);
			if (ret < 0) {
				dev_err(dsim->dev,
					"can't register %s, status %d\n",
					dev_name(&lcd_dev->dev), ret);
				mutex_unlock(&dsim->lock);

				return NULL;
			}

			dsim->dsim_lcd_dev = lcd_dev;
			dsim->dsim_lcd_drv = lcd_drv;

			mutex_unlock(&dsim->lock);

			return dsim_ddi;
		}
	}

	mutex_unlock(&dsim->lock);

	return NULL;
}

/* define MIPI-DSI Master operations. */
static struct mipi_dsim_master_ops master_ops = {
	.cmd_read			= exynos_mipi_dsi_rd_data,
	.cmd_write			= exynos_mipi_dsi_wr_data,
	.get_dsim_frame_done		= exynos_mipi_dsi_get_frame_done_status,
	.clear_dsim_frame_done		= exynos_mipi_dsi_clear_frame_done,
	.set_early_blank_mode		= exynos_mipi_dsi_early_blank_mode,
	.set_blank_mode			= exynos_mipi_dsi_blank_mode,
};

static int exynos_mipi_dsi_probe(struct platform_device *pdev)
{
	struct resource *res;
	struct mipi_dsim_device *dsim;
	struct mipi_dsim_config *dsim_config;
	struct mipi_dsim_platform_data *dsim_pd;
	struct mipi_dsim_ddi *dsim_ddi;
	int ret = -EINVAL;

	dsim = kzalloc(sizeof(struct mipi_dsim_device), GFP_KERNEL);
	if (!dsim) {
		dev_err(&pdev->dev, "failed to allocate dsim object.\n");
		return -ENOMEM;
	}

	dsim->pd = to_dsim_plat(pdev);
	dsim->dev = &pdev->dev;
	dsim->id = pdev->id;

	/* get mipi_dsim_platform_data. */
	dsim_pd = (struct mipi_dsim_platform_data *)dsim->pd;
	if (dsim_pd == NULL) {
		dev_err(&pdev->dev, "failed to get platform data for dsim.\n");
		goto err_clock_get;
	}
	/* get mipi_dsim_config. */
	dsim_config = dsim_pd->dsim_config;
	if (dsim_config == NULL) {
		dev_err(&pdev->dev, "failed to get dsim config data.\n");
		goto err_clock_get;
	}

	dsim->dsim_config = dsim_config;
	dsim->master_ops = &master_ops;

	mutex_init(&dsim->lock);

	ret = regulator_bulk_get(&pdev->dev, ARRAY_SIZE(supplies), supplies);
	if (ret) {
		dev_err(&pdev->dev, "Failed to get regulators: %d\n", ret);
		goto err_clock_get;
	}

	dsim->clock = clk_get(&pdev->dev, "dsim0");
	if (IS_ERR(dsim->clock)) {
		dev_err(&pdev->dev, "failed to get dsim clock source\n");
		ret = -ENODEV;
		goto err_clock_get;
	}

	clk_enable(dsim->clock);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "failed to get io memory region\n");
		ret = -ENODEV;
		goto err_platform_get;
	}

	dsim->res = request_mem_region(res->start, resource_size(res),
					dev_name(&pdev->dev));
	if (!dsim->res) {
		dev_err(&pdev->dev, "failed to request io memory region\n");
		ret = -ENOMEM;
		goto err_mem_region;
	}

	dsim->reg_base = ioremap(res->start, resource_size(res));
	if (!dsim->reg_base) {
		dev_err(&pdev->dev, "failed to remap io region\n");
		ret = -ENOMEM;
		goto err_ioremap;
	}

	mutex_init(&dsim->lock);

	/* bind lcd ddi matched with panel name. */
	dsim_ddi = exynos_mipi_dsi_bind_lcd_ddi(dsim, dsim_pd->lcd_panel_name);
	if (!dsim_ddi) {
		dev_err(&pdev->dev, "mipi_dsim_ddi object not found.\n");
		ret = -EINVAL;
		goto err_bind;
	}

	dsim->irq = platform_get_irq(pdev, 0);
	if (dsim->irq < 0) {
		dev_err(&pdev->dev, "failed to request dsim irq resource\n");
		ret = -EINVAL;
		goto err_platform_get_irq;
	}

	init_completion(&dsim_wr_comp);
	init_completion(&dsim_rd_comp);
	platform_set_drvdata(pdev, dsim);

	ret = request_irq(dsim->irq, exynos_mipi_dsi_interrupt_handler,
			IRQF_SHARED, dev_name(&pdev->dev), dsim);
	if (ret != 0) {
		dev_err(&pdev->dev, "failed to request dsim irq\n");
		ret = -EINVAL;
		goto err_bind;
	}

	/* enable interrupts */
	exynos_mipi_dsi_init_interrupt(dsim);

	/* initialize mipi-dsi client(lcd panel). */
	if (dsim_ddi->dsim_lcd_drv && dsim_ddi->dsim_lcd_drv->probe)
		dsim_ddi->dsim_lcd_drv->probe(dsim_ddi->dsim_lcd_dev);

	/* in case mipi-dsi has been enabled by bootloader */
	if (dsim_pd->enabled) {
		exynos_mipi_regulator_enable(dsim);
		goto done;
	}

	/* lcd panel power on. */
	if (dsim_ddi->dsim_lcd_drv && dsim_ddi->dsim_lcd_drv->power_on)
		dsim_ddi->dsim_lcd_drv->power_on(dsim_ddi->dsim_lcd_dev, 1);

	exynos_mipi_regulator_enable(dsim);

	/* enable MIPI-DSI PHY. */
	if (dsim->pd->phy_enable)
		dsim->pd->phy_enable(pdev, true);

	exynos_mipi_update_cfg(dsim);

	/* set lcd panel sequence commands. */
	if (dsim_ddi->dsim_lcd_drv && dsim_ddi->dsim_lcd_drv->set_sequence)
		dsim_ddi->dsim_lcd_drv->set_sequence(dsim_ddi->dsim_lcd_dev);

	dsim->suspended = false;

done:
	platform_set_drvdata(pdev, dsim);

	dev_dbg(&pdev->dev, "%s() completed successfully (%s mode)\n", __func__,
		dsim_config->e_interface == DSIM_COMMAND ? "CPU" : "RGB");

	return 0;

err_bind:
	iounmap(dsim->reg_base);

err_ioremap:
	release_mem_region(dsim->res->start, resource_size(dsim->res));

err_mem_region:
	release_resource(dsim->res);

err_platform_get:
	clk_disable(dsim->clock);
	clk_put(dsim->clock);
err_clock_get:
	kfree(dsim);

err_platform_get_irq:
	return ret;
}

static int exynos_mipi_dsi_remove(struct platform_device *pdev)
{
	struct mipi_dsim_device *dsim = platform_get_drvdata(pdev);
	struct mipi_dsim_ddi *dsim_ddi, *next;
	struct mipi_dsim_lcd_driver *dsim_lcd_drv;

	iounmap(dsim->reg_base);

	clk_disable(dsim->clock);
	clk_put(dsim->clock);

	release_resource(dsim->res);
	release_mem_region(dsim->res->start, resource_size(dsim->res));

	list_for_each_entry_safe(dsim_ddi, next, &dsim_ddi_list, list) {
		if (dsim_ddi) {
			if (dsim->id != dsim_ddi->bus_id)
				continue;

			dsim_lcd_drv = dsim_ddi->dsim_lcd_drv;

			if (dsim_lcd_drv->remove)
				dsim_lcd_drv->remove(dsim_ddi->dsim_lcd_dev);

			kfree(dsim_ddi);
		}
	}

	regulator_bulk_free(ARRAY_SIZE(supplies), supplies);
	kfree(dsim);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int exynos_mipi_dsi_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct mipi_dsim_device *dsim = platform_get_drvdata(pdev);
	struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
	struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;

	disable_irq(dsim->irq);

	if (dsim->suspended)
		return 0;

	if (client_drv && client_drv->suspend)
		client_drv->suspend(client_dev);

	/* enable MIPI-DSI PHY. */
	if (dsim->pd->phy_enable)
		dsim->pd->phy_enable(pdev, false);

	clk_disable(dsim->clock);

	exynos_mipi_regulator_disable(dsim);

	dsim->suspended = true;

	return 0;
}

static int exynos_mipi_dsi_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct mipi_dsim_device *dsim = platform_get_drvdata(pdev);
	struct mipi_dsim_lcd_driver *client_drv = dsim->dsim_lcd_drv;
	struct mipi_dsim_lcd_device *client_dev = dsim->dsim_lcd_dev;

	enable_irq(dsim->irq);

	if (!dsim->suspended)
		return 0;

	/* lcd panel power on. */
	if (client_drv && client_drv->power_on)
		client_drv->power_on(client_dev, 1);

	exynos_mipi_regulator_enable(dsim);

	/* enable MIPI-DSI PHY. */
	if (dsim->pd->phy_enable)
		dsim->pd->phy_enable(pdev, true);

	clk_enable(dsim->clock);

	exynos_mipi_update_cfg(dsim);

	/* set lcd panel sequence commands. */
	if (client_drv && client_drv->set_sequence)
		client_drv->set_sequence(client_dev);

	dsim->suspended = false;

	return 0;
}
#endif

static const struct dev_pm_ops exynos_mipi_dsi_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(exynos_mipi_dsi_suspend, exynos_mipi_dsi_resume)
};

static struct platform_driver exynos_mipi_dsi_driver = {
	.probe = exynos_mipi_dsi_probe,
	.remove = exynos_mipi_dsi_remove,
	.driver = {
		   .name = "exynos-mipi-dsim",
		   .owner = THIS_MODULE,
		   .pm = &exynos_mipi_dsi_pm_ops,
	},
};

module_platform_driver(exynos_mipi_dsi_driver);

MODULE_AUTHOR("InKi Dae <inki.dae@samsung.com>");
MODULE_DESCRIPTION("Samusung SoC MIPI-DSI driver");
MODULE_LICENSE("GPL");