vsp1_drv.c revision 83453a7cc8b703ce818c24c2298822b0b179e652 
1/*
2 * vsp1_drv.c  --  R-Car VSP1 Driver
3 *
4 * Copyright (C) 2013 Renesas Corporation
5 *
6 * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 */
13
14#include <linux/clk.h>
15#include <linux/delay.h>
16#include <linux/device.h>
17#include <linux/interrupt.h>
18#include <linux/module.h>
19#include <linux/platform_device.h>
20#include <linux/videodev2.h>
21
22#include "vsp1.h"
23#include "vsp1_lif.h"
24#include "vsp1_rwpf.h"
25#include "vsp1_uds.h"
26
27/* -----------------------------------------------------------------------------
28 * Interrupt Handling
29 */
30
31static irqreturn_t vsp1_irq_handler(int irq, void *data)
32{
33	u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
34	struct vsp1_device *vsp1 = data;
35	irqreturn_t ret = IRQ_NONE;
36	unsigned int i;
37
38	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
39		struct vsp1_rwpf *wpf = vsp1->wpf[i];
40		struct vsp1_pipeline *pipe;
41		u32 status;
42
43		if (wpf == NULL)
44			continue;
45
46		pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
47		status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
48		vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);
49
50		if (status & VI6_WFP_IRQ_STA_FRE) {
51			vsp1_pipeline_frame_end(pipe);
52			ret = IRQ_HANDLED;
53		}
54	}
55
56	return ret;
57}
58
59/* -----------------------------------------------------------------------------
60 * Entities
61 */
62
63/*
64 * vsp1_create_links - Create links from all sources to the given sink
65 *
66 * This function creates media links from all valid sources to the given sink
67 * pad. Links that would be invalid according to the VSP1 hardware capabilities
68 * are skipped. Those include all links
69 *
70 * - from a UDS to a UDS (UDS entities can't be chained)
71 * - from an entity to itself (no loops are allowed)
72 */
73static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
74{
75	struct media_entity *entity = &sink->subdev.entity;
76	struct vsp1_entity *source;
77	unsigned int pad;
78	int ret;
79
80	list_for_each_entry(source, &vsp1->entities, list_dev) {
81		u32 flags;
82
83		if (source->type == sink->type)
84			continue;
85
86		if (source->type == VSP1_ENTITY_LIF ||
87		    source->type == VSP1_ENTITY_WPF)
88			continue;
89
90		flags = source->type == VSP1_ENTITY_RPF &&
91			sink->type == VSP1_ENTITY_WPF &&
92			source->index == sink->index
93		      ? MEDIA_LNK_FL_ENABLED : 0;
94
95		for (pad = 0; pad < entity->num_pads; ++pad) {
96			if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
97				continue;
98
99			ret = media_entity_create_link(&source->subdev.entity,
100						       source->source_pad,
101						       entity, pad, flags);
102			if (ret < 0)
103				return ret;
104
105			if (flags & MEDIA_LNK_FL_ENABLED)
106				source->sink = entity;
107		}
108	}
109
110	return 0;
111}
112
113static void vsp1_destroy_entities(struct vsp1_device *vsp1)
114{
115	struct vsp1_entity *entity;
116	struct vsp1_entity *next;
117
118	list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {
119		list_del(&entity->list_dev);
120		vsp1_entity_destroy(entity);
121	}
122
123	v4l2_device_unregister(&vsp1->v4l2_dev);
124	media_device_unregister(&vsp1->media_dev);
125}
126
127static int vsp1_create_entities(struct vsp1_device *vsp1)
128{
129	struct media_device *mdev = &vsp1->media_dev;
130	struct v4l2_device *vdev = &vsp1->v4l2_dev;
131	struct vsp1_entity *entity;
132	unsigned int i;
133	int ret;
134
135	mdev->dev = vsp1->dev;
136	strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
137	ret = media_device_register(mdev);
138	if (ret < 0) {
139		dev_err(vsp1->dev, "media device registration failed (%d)\n",
140			ret);
141		return ret;
142	}
143
144	vdev->mdev = mdev;
145	ret = v4l2_device_register(vsp1->dev, vdev);
146	if (ret < 0) {
147		dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
148			ret);
149		goto done;
150	}
151
152	/* Instantiate all the entities. */
153	if (vsp1->pdata->features & VSP1_HAS_LIF) {
154		vsp1->lif = vsp1_lif_create(vsp1);
155		if (IS_ERR(vsp1->lif)) {
156			ret = PTR_ERR(vsp1->lif);
157			goto done;
158		}
159
160		list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
161	}
162
163	for (i = 0; i < vsp1->pdata->rpf_count; ++i) {
164		struct vsp1_rwpf *rpf;
165
166		rpf = vsp1_rpf_create(vsp1, i);
167		if (IS_ERR(rpf)) {
168			ret = PTR_ERR(rpf);
169			goto done;
170		}
171
172		vsp1->rpf[i] = rpf;
173		list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
174	}
175
176	for (i = 0; i < vsp1->pdata->uds_count; ++i) {
177		struct vsp1_uds *uds;
178
179		uds = vsp1_uds_create(vsp1, i);
180		if (IS_ERR(uds)) {
181			ret = PTR_ERR(uds);
182			goto done;
183		}
184
185		vsp1->uds[i] = uds;
186		list_add_tail(&uds->entity.list_dev, &vsp1->entities);
187	}
188
189	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
190		struct vsp1_rwpf *wpf;
191
192		wpf = vsp1_wpf_create(vsp1, i);
193		if (IS_ERR(wpf)) {
194			ret = PTR_ERR(wpf);
195			goto done;
196		}
197
198		vsp1->wpf[i] = wpf;
199		list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
200	}
201
202	/* Create links. */
203	list_for_each_entry(entity, &vsp1->entities, list_dev) {
204		if (entity->type == VSP1_ENTITY_LIF ||
205		    entity->type == VSP1_ENTITY_RPF)
206			continue;
207
208		ret = vsp1_create_links(vsp1, entity);
209		if (ret < 0)
210			goto done;
211	}
212
213	if (vsp1->pdata->features & VSP1_HAS_LIF) {
214		ret = media_entity_create_link(
215			&vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
216			&vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
217		if (ret < 0)
218			return ret;
219	}
220
221	/* Register all subdevs. */
222	list_for_each_entry(entity, &vsp1->entities, list_dev) {
223		ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
224						  &entity->subdev);
225		if (ret < 0)
226			goto done;
227	}
228
229	ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
230
231done:
232	if (ret < 0)
233		vsp1_destroy_entities(vsp1);
234
235	return ret;
236}
237
238static int vsp1_device_init(struct vsp1_device *vsp1)
239{
240	unsigned int i;
241	u32 status;
242
243	/* Reset any channel that might be running. */
244	status = vsp1_read(vsp1, VI6_STATUS);
245
246	for (i = 0; i < vsp1->pdata->wpf_count; ++i) {
247		unsigned int timeout;
248
249		if (!(status & VI6_STATUS_SYS_ACT(i)))
250			continue;
251
252		vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
253		for (timeout = 10; timeout > 0; --timeout) {
254			status = vsp1_read(vsp1, VI6_STATUS);
255			if (!(status & VI6_STATUS_SYS_ACT(i)))
256				break;
257
258			usleep_range(1000, 2000);
259		}
260
261		if (!timeout) {
262			dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
263			return -ETIMEDOUT;
264		}
265	}
266
267	vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
268		   (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));
269
270	for (i = 0; i < vsp1->pdata->rpf_count; ++i)
271		vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);
272
273	for (i = 0; i < vsp1->pdata->uds_count; ++i)
274		vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);
275
276	vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
277	vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
278	vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
279	vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
280	vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
281	vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);
282
283	vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
284		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
285	vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
286		   (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
287
288	return 0;
289}
290
291/*
292 * vsp1_device_get - Acquire the VSP1 device
293 *
294 * Increment the VSP1 reference count and initialize the device if the first
295 * reference is taken.
296 *
297 * Return a pointer to the VSP1 device or NULL if an error occured.
298 */
299struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1)
300{
301	struct vsp1_device *__vsp1 = vsp1;
302	int ret;
303
304	mutex_lock(&vsp1->lock);
305	if (vsp1->ref_count > 0)
306		goto done;
307
308	ret = clk_prepare_enable(vsp1->clock);
309	if (ret < 0) {
310		__vsp1 = NULL;
311		goto done;
312	}
313
314	ret = vsp1_device_init(vsp1);
315	if (ret < 0) {
316		clk_disable_unprepare(vsp1->clock);
317		__vsp1 = NULL;
318		goto done;
319	}
320
321done:
322	if (__vsp1)
323		vsp1->ref_count++;
324
325	mutex_unlock(&vsp1->lock);
326	return __vsp1;
327}
328
329/*
330 * vsp1_device_put - Release the VSP1 device
331 *
332 * Decrement the VSP1 reference count and cleanup the device if the last
333 * reference is released.
334 */
335void vsp1_device_put(struct vsp1_device *vsp1)
336{
337	mutex_lock(&vsp1->lock);
338
339	if (--vsp1->ref_count == 0)
340		clk_disable_unprepare(vsp1->clock);
341
342	mutex_unlock(&vsp1->lock);
343}
344
345/* -----------------------------------------------------------------------------
346 * Power Management
347 */
348
349#ifdef CONFIG_PM_SLEEP
350static int vsp1_pm_suspend(struct device *dev)
351{
352	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
353
354	WARN_ON(mutex_is_locked(&vsp1->lock));
355
356	if (vsp1->ref_count == 0)
357		return 0;
358
359	clk_disable_unprepare(vsp1->clock);
360	return 0;
361}
362
363static int vsp1_pm_resume(struct device *dev)
364{
365	struct vsp1_device *vsp1 = dev_get_drvdata(dev);
366
367	WARN_ON(mutex_is_locked(&vsp1->lock));
368
369	if (vsp1->ref_count)
370		return 0;
371
372	return clk_prepare_enable(vsp1->clock);
373}
374#endif
375
376static const struct dev_pm_ops vsp1_pm_ops = {
377	SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
378};
379
380/* -----------------------------------------------------------------------------
381 * Platform Driver
382 */
383
384static struct vsp1_platform_data *
385vsp1_get_platform_data(struct platform_device *pdev)
386{
387	struct vsp1_platform_data *pdata = pdev->dev.platform_data;
388
389	if (pdata == NULL) {
390		dev_err(&pdev->dev, "missing platform data\n");
391		return NULL;
392	}
393
394	if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {
395		dev_err(&pdev->dev, "invalid number of RPF (%u)\n",
396			pdata->rpf_count);
397		return NULL;
398	}
399
400	if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {
401		dev_err(&pdev->dev, "invalid number of UDS (%u)\n",
402			pdata->uds_count);
403		return NULL;
404	}
405
406	if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {
407		dev_err(&pdev->dev, "invalid number of WPF (%u)\n",
408			pdata->wpf_count);
409		return NULL;
410	}
411
412	return pdata;
413}
414
415static int vsp1_probe(struct platform_device *pdev)
416{
417	struct vsp1_device *vsp1;
418	struct resource *irq;
419	struct resource *io;
420	int ret;
421
422	vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
423	if (vsp1 == NULL)
424		return -ENOMEM;
425
426	vsp1->dev = &pdev->dev;
427	mutex_init(&vsp1->lock);
428	INIT_LIST_HEAD(&vsp1->entities);
429
430	vsp1->pdata = vsp1_get_platform_data(pdev);
431	if (vsp1->pdata == NULL)
432		return -ENODEV;
433
434	/* I/O, IRQ and clock resources */
435	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
436	vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
437	if (IS_ERR((void *)vsp1->mmio))
438		return PTR_ERR((void *)vsp1->mmio);
439
440	vsp1->clock = devm_clk_get(&pdev->dev, NULL);
441	if (IS_ERR(vsp1->clock)) {
442		dev_err(&pdev->dev, "failed to get clock\n");
443		return PTR_ERR(vsp1->clock);
444	}
445
446	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
447	if (!irq) {
448		dev_err(&pdev->dev, "missing IRQ\n");
449		return -EINVAL;
450	}
451
452	ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
453			      IRQF_SHARED, dev_name(&pdev->dev), vsp1);
454	if (ret < 0) {
455		dev_err(&pdev->dev, "failed to request IRQ\n");
456		return ret;
457	}
458
459	/* Instanciate entities */
460	ret = vsp1_create_entities(vsp1);
461	if (ret < 0) {
462		dev_err(&pdev->dev, "failed to create entities\n");
463		return ret;
464	}
465
466	platform_set_drvdata(pdev, vsp1);
467
468	return 0;
469}
470
471static int vsp1_remove(struct platform_device *pdev)
472{
473	struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
474
475	vsp1_destroy_entities(vsp1);
476
477	return 0;
478}
479
480static struct platform_driver vsp1_platform_driver = {
481	.probe		= vsp1_probe,
482	.remove		= vsp1_remove,
483	.driver		= {
484		.owner	= THIS_MODULE,
485		.name	= "vsp1",
486		.pm	= &vsp1_pm_ops,
487	},
488};
489
490module_platform_driver(vsp1_platform_driver);
491
492MODULE_ALIAS("vsp1");
493MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
494MODULE_DESCRIPTION("Renesas VSP1 Driver");
495MODULE_LICENSE("GPL");
496