These changes are the raw update to linux-4.4.6-rt14. Kernel sources
[kvmfornfv.git] / kernel / drivers / media / platform / vsp1 / vsp1_drv.c
1 /*
2  * vsp1_drv.c  --  R-Car VSP1 Driver
3  *
4  * Copyright (C) 2013-2015 Renesas Electronics 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/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/videodev2.h>
22
23 #include "vsp1.h"
24 #include "vsp1_bru.h"
25 #include "vsp1_hsit.h"
26 #include "vsp1_lif.h"
27 #include "vsp1_lut.h"
28 #include "vsp1_rwpf.h"
29 #include "vsp1_sru.h"
30 #include "vsp1_uds.h"
31
32 /* -----------------------------------------------------------------------------
33  * Interrupt Handling
34  */
35
36 static irqreturn_t vsp1_irq_handler(int irq, void *data)
37 {
38         u32 mask = VI6_WFP_IRQ_STA_DFE | VI6_WFP_IRQ_STA_FRE;
39         struct vsp1_device *vsp1 = data;
40         irqreturn_t ret = IRQ_NONE;
41         unsigned int i;
42
43         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
44                 struct vsp1_rwpf *wpf = vsp1->wpf[i];
45                 struct vsp1_pipeline *pipe;
46                 u32 status;
47
48                 if (wpf == NULL)
49                         continue;
50
51                 pipe = to_vsp1_pipeline(&wpf->entity.subdev.entity);
52                 status = vsp1_read(vsp1, VI6_WPF_IRQ_STA(i));
53                 vsp1_write(vsp1, VI6_WPF_IRQ_STA(i), ~status & mask);
54
55                 if (status & VI6_WFP_IRQ_STA_FRE) {
56                         vsp1_pipeline_frame_end(pipe);
57                         ret = IRQ_HANDLED;
58                 }
59         }
60
61         return ret;
62 }
63
64 /* -----------------------------------------------------------------------------
65  * Entities
66  */
67
68 /*
69  * vsp1_create_links - Create links from all sources to the given sink
70  *
71  * This function creates media links from all valid sources to the given sink
72  * pad. Links that would be invalid according to the VSP1 hardware capabilities
73  * are skipped. Those include all links
74  *
75  * - from a UDS to a UDS (UDS entities can't be chained)
76  * - from an entity to itself (no loops are allowed)
77  */
78 static int vsp1_create_links(struct vsp1_device *vsp1, struct vsp1_entity *sink)
79 {
80         struct media_entity *entity = &sink->subdev.entity;
81         struct vsp1_entity *source;
82         unsigned int pad;
83         int ret;
84
85         list_for_each_entry(source, &vsp1->entities, list_dev) {
86                 u32 flags;
87
88                 if (source->type == sink->type)
89                         continue;
90
91                 if (source->type == VSP1_ENTITY_LIF ||
92                     source->type == VSP1_ENTITY_WPF)
93                         continue;
94
95                 flags = source->type == VSP1_ENTITY_RPF &&
96                         sink->type == VSP1_ENTITY_WPF &&
97                         source->index == sink->index
98                       ? MEDIA_LNK_FL_ENABLED : 0;
99
100                 for (pad = 0; pad < entity->num_pads; ++pad) {
101                         if (!(entity->pads[pad].flags & MEDIA_PAD_FL_SINK))
102                                 continue;
103
104                         ret = media_entity_create_link(&source->subdev.entity,
105                                                        source->source_pad,
106                                                        entity, pad, flags);
107                         if (ret < 0)
108                                 return ret;
109
110                         if (flags & MEDIA_LNK_FL_ENABLED)
111                                 source->sink = entity;
112                 }
113         }
114
115         return 0;
116 }
117
118 static void vsp1_destroy_entities(struct vsp1_device *vsp1)
119 {
120         struct vsp1_entity *entity;
121         struct vsp1_entity *next;
122
123         list_for_each_entry_safe(entity, next, &vsp1->entities, list_dev) {
124                 list_del(&entity->list_dev);
125                 vsp1_entity_destroy(entity);
126         }
127
128         v4l2_device_unregister(&vsp1->v4l2_dev);
129         media_device_unregister(&vsp1->media_dev);
130 }
131
132 static int vsp1_create_entities(struct vsp1_device *vsp1)
133 {
134         struct media_device *mdev = &vsp1->media_dev;
135         struct v4l2_device *vdev = &vsp1->v4l2_dev;
136         struct vsp1_entity *entity;
137         unsigned int i;
138         int ret;
139
140         mdev->dev = vsp1->dev;
141         strlcpy(mdev->model, "VSP1", sizeof(mdev->model));
142         snprintf(mdev->bus_info, sizeof(mdev->bus_info), "platform:%s",
143                  dev_name(mdev->dev));
144         ret = media_device_register(mdev);
145         if (ret < 0) {
146                 dev_err(vsp1->dev, "media device registration failed (%d)\n",
147                         ret);
148                 return ret;
149         }
150
151         vdev->mdev = mdev;
152         ret = v4l2_device_register(vsp1->dev, vdev);
153         if (ret < 0) {
154                 dev_err(vsp1->dev, "V4L2 device registration failed (%d)\n",
155                         ret);
156                 goto done;
157         }
158
159         /* Instantiate all the entities. */
160         vsp1->bru = vsp1_bru_create(vsp1);
161         if (IS_ERR(vsp1->bru)) {
162                 ret = PTR_ERR(vsp1->bru);
163                 goto done;
164         }
165
166         list_add_tail(&vsp1->bru->entity.list_dev, &vsp1->entities);
167
168         vsp1->hsi = vsp1_hsit_create(vsp1, true);
169         if (IS_ERR(vsp1->hsi)) {
170                 ret = PTR_ERR(vsp1->hsi);
171                 goto done;
172         }
173
174         list_add_tail(&vsp1->hsi->entity.list_dev, &vsp1->entities);
175
176         vsp1->hst = vsp1_hsit_create(vsp1, false);
177         if (IS_ERR(vsp1->hst)) {
178                 ret = PTR_ERR(vsp1->hst);
179                 goto done;
180         }
181
182         list_add_tail(&vsp1->hst->entity.list_dev, &vsp1->entities);
183
184         if (vsp1->pdata.features & VSP1_HAS_LIF) {
185                 vsp1->lif = vsp1_lif_create(vsp1);
186                 if (IS_ERR(vsp1->lif)) {
187                         ret = PTR_ERR(vsp1->lif);
188                         goto done;
189                 }
190
191                 list_add_tail(&vsp1->lif->entity.list_dev, &vsp1->entities);
192         }
193
194         if (vsp1->pdata.features & VSP1_HAS_LUT) {
195                 vsp1->lut = vsp1_lut_create(vsp1);
196                 if (IS_ERR(vsp1->lut)) {
197                         ret = PTR_ERR(vsp1->lut);
198                         goto done;
199                 }
200
201                 list_add_tail(&vsp1->lut->entity.list_dev, &vsp1->entities);
202         }
203
204         for (i = 0; i < vsp1->pdata.rpf_count; ++i) {
205                 struct vsp1_rwpf *rpf;
206
207                 rpf = vsp1_rpf_create(vsp1, i);
208                 if (IS_ERR(rpf)) {
209                         ret = PTR_ERR(rpf);
210                         goto done;
211                 }
212
213                 vsp1->rpf[i] = rpf;
214                 list_add_tail(&rpf->entity.list_dev, &vsp1->entities);
215         }
216
217         if (vsp1->pdata.features & VSP1_HAS_SRU) {
218                 vsp1->sru = vsp1_sru_create(vsp1);
219                 if (IS_ERR(vsp1->sru)) {
220                         ret = PTR_ERR(vsp1->sru);
221                         goto done;
222                 }
223
224                 list_add_tail(&vsp1->sru->entity.list_dev, &vsp1->entities);
225         }
226
227         for (i = 0; i < vsp1->pdata.uds_count; ++i) {
228                 struct vsp1_uds *uds;
229
230                 uds = vsp1_uds_create(vsp1, i);
231                 if (IS_ERR(uds)) {
232                         ret = PTR_ERR(uds);
233                         goto done;
234                 }
235
236                 vsp1->uds[i] = uds;
237                 list_add_tail(&uds->entity.list_dev, &vsp1->entities);
238         }
239
240         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
241                 struct vsp1_rwpf *wpf;
242
243                 wpf = vsp1_wpf_create(vsp1, i);
244                 if (IS_ERR(wpf)) {
245                         ret = PTR_ERR(wpf);
246                         goto done;
247                 }
248
249                 vsp1->wpf[i] = wpf;
250                 list_add_tail(&wpf->entity.list_dev, &vsp1->entities);
251         }
252
253         /* Create links. */
254         list_for_each_entry(entity, &vsp1->entities, list_dev) {
255                 if (entity->type == VSP1_ENTITY_LIF ||
256                     entity->type == VSP1_ENTITY_RPF)
257                         continue;
258
259                 ret = vsp1_create_links(vsp1, entity);
260                 if (ret < 0)
261                         goto done;
262         }
263
264         if (vsp1->pdata.features & VSP1_HAS_LIF) {
265                 ret = media_entity_create_link(
266                         &vsp1->wpf[0]->entity.subdev.entity, RWPF_PAD_SOURCE,
267                         &vsp1->lif->entity.subdev.entity, LIF_PAD_SINK, 0);
268                 if (ret < 0)
269                         return ret;
270         }
271
272         /* Register all subdevs. */
273         list_for_each_entry(entity, &vsp1->entities, list_dev) {
274                 ret = v4l2_device_register_subdev(&vsp1->v4l2_dev,
275                                                   &entity->subdev);
276                 if (ret < 0)
277                         goto done;
278         }
279
280         ret = v4l2_device_register_subdev_nodes(&vsp1->v4l2_dev);
281
282 done:
283         if (ret < 0)
284                 vsp1_destroy_entities(vsp1);
285
286         return ret;
287 }
288
289 static int vsp1_device_init(struct vsp1_device *vsp1)
290 {
291         unsigned int i;
292         u32 status;
293
294         /* Reset any channel that might be running. */
295         status = vsp1_read(vsp1, VI6_STATUS);
296
297         for (i = 0; i < vsp1->pdata.wpf_count; ++i) {
298                 unsigned int timeout;
299
300                 if (!(status & VI6_STATUS_SYS_ACT(i)))
301                         continue;
302
303                 vsp1_write(vsp1, VI6_SRESET, VI6_SRESET_SRTS(i));
304                 for (timeout = 10; timeout > 0; --timeout) {
305                         status = vsp1_read(vsp1, VI6_STATUS);
306                         if (!(status & VI6_STATUS_SYS_ACT(i)))
307                                 break;
308
309                         usleep_range(1000, 2000);
310                 }
311
312                 if (!timeout) {
313                         dev_err(vsp1->dev, "failed to reset wpf.%u\n", i);
314                         return -ETIMEDOUT;
315                 }
316         }
317
318         vsp1_write(vsp1, VI6_CLK_DCSWT, (8 << VI6_CLK_DCSWT_CSTPW_SHIFT) |
319                    (8 << VI6_CLK_DCSWT_CSTRW_SHIFT));
320
321         for (i = 0; i < vsp1->pdata.rpf_count; ++i)
322                 vsp1_write(vsp1, VI6_DPR_RPF_ROUTE(i), VI6_DPR_NODE_UNUSED);
323
324         for (i = 0; i < vsp1->pdata.uds_count; ++i)
325                 vsp1_write(vsp1, VI6_DPR_UDS_ROUTE(i), VI6_DPR_NODE_UNUSED);
326
327         vsp1_write(vsp1, VI6_DPR_SRU_ROUTE, VI6_DPR_NODE_UNUSED);
328         vsp1_write(vsp1, VI6_DPR_LUT_ROUTE, VI6_DPR_NODE_UNUSED);
329         vsp1_write(vsp1, VI6_DPR_CLU_ROUTE, VI6_DPR_NODE_UNUSED);
330         vsp1_write(vsp1, VI6_DPR_HST_ROUTE, VI6_DPR_NODE_UNUSED);
331         vsp1_write(vsp1, VI6_DPR_HSI_ROUTE, VI6_DPR_NODE_UNUSED);
332         vsp1_write(vsp1, VI6_DPR_BRU_ROUTE, VI6_DPR_NODE_UNUSED);
333
334         vsp1_write(vsp1, VI6_DPR_HGO_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
335                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
336         vsp1_write(vsp1, VI6_DPR_HGT_SMPPT, (7 << VI6_DPR_SMPPT_TGW_SHIFT) |
337                    (VI6_DPR_NODE_UNUSED << VI6_DPR_SMPPT_PT_SHIFT));
338
339         return 0;
340 }
341
342 /*
343  * vsp1_device_get - Acquire the VSP1 device
344  *
345  * Increment the VSP1 reference count and initialize the device if the first
346  * reference is taken.
347  *
348  * Return 0 on success or a negative error code otherwise.
349  */
350 int vsp1_device_get(struct vsp1_device *vsp1)
351 {
352         int ret = 0;
353
354         mutex_lock(&vsp1->lock);
355         if (vsp1->ref_count > 0)
356                 goto done;
357
358         ret = clk_prepare_enable(vsp1->clock);
359         if (ret < 0)
360                 goto done;
361
362         ret = vsp1_device_init(vsp1);
363         if (ret < 0) {
364                 clk_disable_unprepare(vsp1->clock);
365                 goto done;
366         }
367
368 done:
369         if (!ret)
370                 vsp1->ref_count++;
371
372         mutex_unlock(&vsp1->lock);
373         return ret;
374 }
375
376 /*
377  * vsp1_device_put - Release the VSP1 device
378  *
379  * Decrement the VSP1 reference count and cleanup the device if the last
380  * reference is released.
381  */
382 void vsp1_device_put(struct vsp1_device *vsp1)
383 {
384         mutex_lock(&vsp1->lock);
385
386         if (--vsp1->ref_count == 0)
387                 clk_disable_unprepare(vsp1->clock);
388
389         mutex_unlock(&vsp1->lock);
390 }
391
392 /* -----------------------------------------------------------------------------
393  * Power Management
394  */
395
396 #ifdef CONFIG_PM_SLEEP
397 static int vsp1_pm_suspend(struct device *dev)
398 {
399         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
400
401         WARN_ON(mutex_is_locked(&vsp1->lock));
402
403         if (vsp1->ref_count == 0)
404                 return 0;
405
406         vsp1_pipelines_suspend(vsp1);
407
408         clk_disable_unprepare(vsp1->clock);
409
410         return 0;
411 }
412
413 static int vsp1_pm_resume(struct device *dev)
414 {
415         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
416
417         WARN_ON(mutex_is_locked(&vsp1->lock));
418
419         if (vsp1->ref_count == 0)
420                 return 0;
421
422         clk_prepare_enable(vsp1->clock);
423
424         vsp1_pipelines_resume(vsp1);
425
426         return 0;
427 }
428 #endif
429
430 static const struct dev_pm_ops vsp1_pm_ops = {
431         SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
432 };
433
434 /* -----------------------------------------------------------------------------
435  * Platform Driver
436  */
437
438 static int vsp1_parse_dt(struct vsp1_device *vsp1)
439 {
440         struct device_node *np = vsp1->dev->of_node;
441         struct vsp1_platform_data *pdata = &vsp1->pdata;
442
443         if (of_property_read_bool(np, "renesas,has-lif"))
444                 pdata->features |= VSP1_HAS_LIF;
445         if (of_property_read_bool(np, "renesas,has-lut"))
446                 pdata->features |= VSP1_HAS_LUT;
447         if (of_property_read_bool(np, "renesas,has-sru"))
448                 pdata->features |= VSP1_HAS_SRU;
449
450         of_property_read_u32(np, "renesas,#rpf", &pdata->rpf_count);
451         of_property_read_u32(np, "renesas,#uds", &pdata->uds_count);
452         of_property_read_u32(np, "renesas,#wpf", &pdata->wpf_count);
453
454         if (pdata->rpf_count <= 0 || pdata->rpf_count > VSP1_MAX_RPF) {
455                 dev_err(vsp1->dev, "invalid number of RPF (%u)\n",
456                         pdata->rpf_count);
457                 return -EINVAL;
458         }
459
460         if (pdata->uds_count <= 0 || pdata->uds_count > VSP1_MAX_UDS) {
461                 dev_err(vsp1->dev, "invalid number of UDS (%u)\n",
462                         pdata->uds_count);
463                 return -EINVAL;
464         }
465
466         if (pdata->wpf_count <= 0 || pdata->wpf_count > VSP1_MAX_WPF) {
467                 dev_err(vsp1->dev, "invalid number of WPF (%u)\n",
468                         pdata->wpf_count);
469                 return -EINVAL;
470         }
471
472         return 0;
473 }
474
475 static int vsp1_probe(struct platform_device *pdev)
476 {
477         struct vsp1_device *vsp1;
478         struct resource *irq;
479         struct resource *io;
480         int ret;
481
482         vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
483         if (vsp1 == NULL)
484                 return -ENOMEM;
485
486         vsp1->dev = &pdev->dev;
487         mutex_init(&vsp1->lock);
488         INIT_LIST_HEAD(&vsp1->entities);
489
490         ret = vsp1_parse_dt(vsp1);
491         if (ret < 0)
492                 return ret;
493
494         /* I/O, IRQ and clock resources */
495         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
496         vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
497         if (IS_ERR(vsp1->mmio))
498                 return PTR_ERR(vsp1->mmio);
499
500         vsp1->clock = devm_clk_get(&pdev->dev, NULL);
501         if (IS_ERR(vsp1->clock)) {
502                 dev_err(&pdev->dev, "failed to get clock\n");
503                 return PTR_ERR(vsp1->clock);
504         }
505
506         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
507         if (!irq) {
508                 dev_err(&pdev->dev, "missing IRQ\n");
509                 return -EINVAL;
510         }
511
512         ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
513                               IRQF_SHARED, dev_name(&pdev->dev), vsp1);
514         if (ret < 0) {
515                 dev_err(&pdev->dev, "failed to request IRQ\n");
516                 return ret;
517         }
518
519         /* Instanciate entities */
520         ret = vsp1_create_entities(vsp1);
521         if (ret < 0) {
522                 dev_err(&pdev->dev, "failed to create entities\n");
523                 return ret;
524         }
525
526         platform_set_drvdata(pdev, vsp1);
527
528         return 0;
529 }
530
531 static int vsp1_remove(struct platform_device *pdev)
532 {
533         struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
534
535         vsp1_destroy_entities(vsp1);
536
537         return 0;
538 }
539
540 static const struct of_device_id vsp1_of_match[] = {
541         { .compatible = "renesas,vsp1" },
542         { },
543 };
544
545 static struct platform_driver vsp1_platform_driver = {
546         .probe          = vsp1_probe,
547         .remove         = vsp1_remove,
548         .driver         = {
549                 .name   = "vsp1",
550                 .pm     = &vsp1_pm_ops,
551                 .of_match_table = vsp1_of_match,
552         },
553 };
554
555 module_platform_driver(vsp1_platform_driver);
556
557 MODULE_ALIAS("vsp1");
558 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
559 MODULE_DESCRIPTION("Renesas VSP1 Driver");
560 MODULE_LICENSE("GPL");