summaryrefslogtreecommitdiffstats
path: root/drivers/media/platform/vsp1/vsp1_drv.c
blob: 1c9e771aa15c7bb40b5a8a1de25d66b2b108c528 (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
/*
 * vsp1_drv.c  --  R-Car VSP1 Driver
 *
 * Copyright (C) 2013 Renesas Corporation
 *
 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/videodev2.h>

#include "vsp1.h"
#include "vsp1_lif.h"
#include "vsp1_rwpf.h"
#include "vsp1_uds.h"

/* -----------------------------------------------------------------------------
 * Interrupt Handling
 */

static irqreturn_t vsp1_irq_handler(int irq, void *data)
{
	u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
	struct vsp1_device *vsp1 = data;
	irqreturn_t ret = IRQ_NONE;
	unsigned int i;

	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
		struct vsp1_rwpf *wpf = vsp1->wpf[i];
		struct vsp1_pipeline *pipe;
		u32 status;

		if (wpf == NULL)
			continue;

		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
		status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
		vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);

		if (status & VI6_WFP_IRQ_STA_FRE) {
			vsp1_pipeline_frame_end(pipe);
			ret = IRQ_HANDLED;
		}
	}

	return ret;
}

/* -----------------------------------------------------------------------------
 * Entities
 */

/*
 * vsp1_create_links - Create links from all sources to the given sink
 *
 * This function creates media links from all valid sources to the given sink
 * pad. Links that would be invalid according to the VSP1 hardware capabilities
 * are skipped. Those include all links
 *
 * - from a UDS to a UDS (UDS entities can't be chained)
 * - from an entity to itself (no loops are allowed)
 */
static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
{
	struct media_entity *entity = &sink->subdev.entity;
	struct vsp1_entity *source;
	unsigned int pad;
	int ret;

	list_for_each_entry(source, &vsp1->entities, list_dev) {
		u32 flags;

		if (source->type == sink->type)
			continue;

		if (source->type == VSP1_ENTITY_LIF ||
		    source->type == VSP1_ENTITY_WPF)
			continue;

		flags = source->type == VSP1_ENTITY_RPF &&
			sink->type == VSP1_ENTITY_WPF &&
			source->index == sink->index
		      ? MEDIA_LNK_FL_ENABLED : 0;

		for (pad = 0; pad < entity->num_pads; ++pad) {
			if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
				continue;

			ret = media_entity_create_link(&source->subdev.entity,
						       source->source_pad,
						       entity, pad, flags);
			if (ret < 0)
				return ret;

			if (flags & MEDIA_LNK_FL_ENABLED)
				source->sink = entity;
		}
	}

	return 0;
}

static void vsp1_destroy_entities(struct vsp1_device *vsp1)
{
	struct vsp1_entity *entity;
	struct vsp1_entity *next;

	list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {
		list_del(&entity->list_dev);
		vsp1_entity_destroy(entity);
	}

	v4l2_device_unregister(&vsp1->v4l2_dev);
	media_device_unregister(&vsp1->media_dev);
}

static int vsp1_create_entities(struct vsp1_device *vsp1)
{
	struct media_device *mdev = &vsp1->media_dev;
	struct v4l2_device *vdev = &vsp1->v4l2_dev;
	struct vsp1_entity *entity;
	unsigned int i;
	int ret;

	mdev->dev = vsp1->dev;
	strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
	snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
		 dev_name(mdev->dev));
	ret = media_device_register(mdev);
	if (ret < 0) {
		dev_err(vsp1->dev, "media device registration failed (%d)\n",
			ret);
		return ret;
	}

	vdev->mdev = mdev;
	ret = v4l2_device_register(vsp1->dev, vdev);
	if (ret < 0) {
		dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
			ret);
		goto done;
	}

	/* Instantiate all the entities. */
	if (vsp1->pdata->features & VSP1_HAS_LIF) {
		vsp1->lif = vsp1_lif_create(vsp1);
		if (IS_ERR(vsp1->lif)) {
			ret = PTR_ERR(vsp1->lif);
			goto done;
		}

		list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
	}

	for (i = 0; i < vsp1->pdata->rpf_count; ++i) {
		struct vsp1_rwpf *rpf;

		rpf = vsp1_rpf_create(vsp1, i);
		if (IS_ERR(rpf)) {
			ret = PTR_ERR(rpf);
			goto done;
		}

		vsp1->rpf[i] = rpf;
		list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
	}

	for (i = 0; i < vsp1->pdata->uds_count; ++i) {
		struct vsp1_uds *uds;

		uds = vsp1_uds_create(vsp1, i);
		if (IS_ERR(uds)) {
			ret = PTR_ERR(uds);
			goto done;
		}

		vsp1->uds[i] = uds;
		list_add_tail(&uds->entity.list_dev, &vsp1->entities);
	}

	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
		struct vsp1_rwpf *wpf;

		wpf = vsp1_wpf_create(vsp1, i);
		if (IS_ERR(wpf)) {
			ret = PTR_ERR(wpf);
			goto done;
		}

		vsp1->wpf[i] = wpf;
		list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
	}

	/* Create links. */
	list_for_each_entry(entity, &vsp1->entities, list_dev) {
		if (entity->type == VSP1_ENTITY_LIF ||
		    entity->type == VSP1_ENTITY_RPF)
			continue;

		ret = vsp1_create_links(vsp1, entity);
		if (ret < 0)
			goto done;
	}

	if (vsp1->pdata->features & VSP1_HAS_LIF) {
		ret = media_entity_create_link(
			&vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
			&vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
		if (ret < 0)
			return ret;
	}

	/* Register all subdevs. */
	list_for_each_entry(entity, &vsp1->entities, list_dev) {
		ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
						  &entity->subdev);
		if (ret < 0)
			goto done;
	}

	ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);

done:
	if (ret < 0)
		vsp1_destroy_entities(vsp1);

	return ret;
}

static int vsp1_device_init(struct vsp1_device *vsp1)
{
	unsigned int i;
	u32 status;

	/* Reset any channel that might be running. */
	status = vsp1_read(vsp1, VI6_STATUS);

	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
		unsigned int timeout;

		if (!(status & VI6_STATUS_SYS_ACT(i)))
			continue;

		vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
		for (timeout = 10; timeout > 0; --timeout) {
			status = vsp1_read(vsp1, VI6_STATUS);
			if (!(status & VI6_STATUS_SYS_ACT(i)))
				break;

			usleep_range(1000, 2000);
		}

		if (!timeout) {
			dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
			return -ETIMEDOUT;
		}
	}

	vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
		   (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));

	for (i = 0; i < vsp1->pdata->rpf_count; ++i)
		vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);

	for (i = 0; i < vsp1->pdata->uds_count; ++i)
		vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
	vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
	vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
	vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
	vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
	vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);

	vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
	vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));

	return 0;
}

static int vsp1_clocks_enable(struct vsp1_device *vsp1)
{
	int ret;

	ret = clk_prepare_enable(vsp1->clock);
	if (ret < 0)
		return ret;

	if (IS_ERR(vsp1->rt_clock))
		return 0;

	ret = clk_prepare_enable(vsp1->rt_clock);
	if (ret < 0) {
		clk_disable_unprepare(vsp1->clock);
		return ret;
	}

	return 0;
}

static void vsp1_clocks_disable(struct vsp1_device *vsp1)
{
	if (!IS_ERR(vsp1->rt_clock))
		clk_disable_unprepare(vsp1->rt_clock);
	clk_disable_unprepare(vsp1->clock);
}

/*
 * vsp1_device_get - Acquire the VSP1 device
 *
 * Increment the VSP1 reference count and initialize the device if the first
 * reference is taken.
 *
 * Return a pointer to the VSP1 device or NULL if an error occured.
 */
struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1)
{
	struct vsp1_device *__vsp1 = vsp1;
	int ret;

	mutex_lock(&vsp1->lock);
	if (vsp1->ref_count > 0)
		goto done;

	ret = vsp1_clocks_enable(vsp1);
	if (ret < 0) {
		__vsp1 = NULL;
		goto done;
	}

	ret = vsp1_device_init(vsp1);
	if (ret < 0) {
		vsp1_clocks_disable(vsp1);
		__vsp1 = NULL;
		goto done;
	}

done:
	if (__vsp1)
		vsp1->ref_count++;

	mutex_unlock(&vsp1->lock);
	return __vsp1;
}

/*
 * vsp1_device_put - Release the VSP1 device
 *
 * Decrement the VSP1 reference count and cleanup the device if the last
 * reference is released.
 */
void vsp1_device_put(struct vsp1_device *vsp1)
{
	mutex_lock(&vsp1->lock);

	if (--vsp1->ref_count == 0)
		vsp1_clocks_disable(vsp1);

	mutex_unlock(&vsp1->lock);
}

/* -----------------------------------------------------------------------------
 * Power Management
 */

#ifdef CONFIG_PM_SLEEP
static int vsp1_pm_suspend(struct device *dev)
{
	struct vsp1_device *vsp1 = dev_get_drvdata(dev);

	WARN_ON(mutex_is_locked(&vsp1->lock));

	if (vsp1->ref_count == 0)
		return 0;

	vsp1_clocks_disable(vsp1);
	return 0;
}

static int vsp1_pm_resume(struct device *dev)
{
	struct vsp1_device *vsp1 = dev_get_drvdata(dev);

	WARN_ON(mutex_is_locked(&vsp1->lock));

	if (vsp1->ref_count)
		return 0;

	return vsp1_clocks_enable(vsp1);
}
#endif

static const struct dev_pm_ops vsp1_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
};

/* -----------------------------------------------------------------------------
 * Platform Driver
 */

static struct vsp1_platform_data *
vsp1_get_platform_data(struct platform_device *pdev)
{
	struct vsp1_platform_data *pdata = pdev->dev.platform_data;

	if (pdata == NULL) {
		dev_err(&pdev->dev, "missing platform data\n");
		return NULL;
	}

	if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {
		dev_err(&pdev->dev, "invalid number of RPF (%u)\n",
			pdata->rpf_count);
		return NULL;
	}

	if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {
		dev_err(&pdev->dev, "invalid number of UDS (%u)\n",
			pdata->uds_count);
		return NULL;
	}

	if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {
		dev_err(&pdev->dev, "invalid number of WPF (%u)\n",
			pdata->wpf_count);
		return NULL;
	}

	return pdata;
}

static int vsp1_probe(struct platform_device *pdev)
{
	struct vsp1_device *vsp1;
	struct resource *irq;
	struct resource *io;
	int ret;

	vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
	if (vsp1 == NULL)
		return -ENOMEM;

	vsp1->dev = &pdev->dev;
	mutex_init(&vsp1->lock);
	INIT_LIST_HEAD(&vsp1->entities);

	vsp1->pdata = vsp1_get_platform_data(pdev);
	if (vsp1->pdata == NULL)
		return -ENODEV;

	/* I/O, IRQ and clock resources */
	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
	if (IS_ERR(vsp1->mmio))
		return PTR_ERR(vsp1->mmio);

	vsp1->clock = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(vsp1->clock)) {
		dev_err(&pdev->dev, "failed to get clock\n");
		return PTR_ERR(vsp1->clock);
	}

	/* The RT clock is optional */
	vsp1->rt_clock = devm_clk_get(&pdev->dev, "rt");

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!irq) {
		dev_err(&pdev->dev, "missing IRQ\n");
		return -EINVAL;
	}

	ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
			      IRQF_SHARED, dev_name(&pdev->dev), vsp1);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to request IRQ\n");
		return ret;
	}

	/* Instanciate entities */
	ret = vsp1_create_entities(vsp1);
	if (ret < 0) {
		dev_err(&pdev->dev, "failed to create entities\n");
		return ret;
	}

	platform_set_drvdata(pdev, vsp1);

	return 0;
}

static int vsp1_remove(struct platform_device *pdev)
{
	struct vsp1_device *vsp1 = platform_get_drvdata(pdev);

	vsp1_destroy_entities(vsp1);

	return 0;
}

static struct platform_driver vsp1_platform_driver = {
	.probe		= vsp1_probe,
	.remove		= vsp1_remove,
	.driver		= {
		.owner	= THIS_MODULE,
		.name	= "vsp1",
		.pm	= &vsp1_pm_ops,
	},
};

module_platform_driver(vsp1_platform_driver);

MODULE_ALIAS("vsp1");
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Renesas VSP1 Driver");
MODULE_LICENSE("GPL");