Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/media/platform/vsp1/vsp1_drv.c

  1 /*
  2  * vsp1_drv.c  --  R-Car VSP1 Driver
  3  *
  4  * Copyright (C) 2013-2014 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 a pointer to the VSP1 device or NULL if an error occurred.
349  */
350 struct vsp1_device *vsp1_device_get(struct vsp1_device *vsp1)
351 {
352         struct vsp1_device *__vsp1 = vsp1;
353         int ret;
354 
355         mutex_lock(&vsp1->lock);
356         if (vsp1->ref_count > 0)
357                 goto done;
358 
359         ret = clk_prepare_enable(vsp1->clock);
360         if (ret < 0) {
361                 __vsp1 = NULL;
362                 goto done;
363         }
364 
365         ret = vsp1_device_init(vsp1);
366         if (ret < 0) {
367                 clk_disable_unprepare(vsp1->clock);
368                 __vsp1 = NULL;
369                 goto done;
370         }
371 
372 done:
373         if (__vsp1)
374                 vsp1->ref_count++;
375 
376         mutex_unlock(&vsp1->lock);
377         return __vsp1;
378 }
379 
380 /*
381  * vsp1_device_put - Release the VSP1 device
382  *
383  * Decrement the VSP1 reference count and cleanup the device if the last
384  * reference is released.
385  */
386 void vsp1_device_put(struct vsp1_device *vsp1)
387 {
388         mutex_lock(&vsp1->lock);
389 
390         if (--vsp1->ref_count == 0)
391                 clk_disable_unprepare(vsp1->clock);
392 
393         mutex_unlock(&vsp1->lock);
394 }
395 
396 /* -----------------------------------------------------------------------------
397  * Power Management
398  */
399 
400 #ifdef CONFIG_PM_SLEEP
401 static int vsp1_pm_suspend(struct device *dev)
402 {
403         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
404 
405         WARN_ON(mutex_is_locked(&vsp1->lock));
406 
407         if (vsp1->ref_count == 0)
408                 return 0;
409 
410         clk_disable_unprepare(vsp1->clock);
411         return 0;
412 }
413 
414 static int vsp1_pm_resume(struct device *dev)
415 {
416         struct vsp1_device *vsp1 = dev_get_drvdata(dev);
417 
418         WARN_ON(mutex_is_locked(&vsp1->lock));
419 
420         if (vsp1->ref_count)
421                 return 0;
422 
423         return clk_prepare_enable(vsp1->clock);
424 }
425 #endif
426 
427 static const struct dev_pm_ops vsp1_pm_ops = {
428         SET_SYSTEM_SLEEP_PM_OPS(vsp1_pm_suspend, vsp1_pm_resume)
429 };
430 
431 /* -----------------------------------------------------------------------------
432  * Platform Driver
433  */
434 
435 static int vsp1_validate_platform_data(struct platform_device *pdev,
436                                        struct vsp1_platform_data *pdata)
437 {
438         if (pdata == NULL) {
439                 dev_err(&pdev->dev, "missing platform data\n");
440                 return -EINVAL;
441         }
442 
443         if (pdata->rpf_count <= 0 || pdata->rpf_count > VPS1_MAX_RPF) {
444                 dev_err(&pdev->dev, "invalid number of RPF (%u)\n",
445                         pdata->rpf_count);
446                 return -EINVAL;
447         }
448 
449         if (pdata->uds_count <= 0 || pdata->uds_count > VPS1_MAX_UDS) {
450                 dev_err(&pdev->dev, "invalid number of UDS (%u)\n",
451                         pdata->uds_count);
452                 return -EINVAL;
453         }
454 
455         if (pdata->wpf_count <= 0 || pdata->wpf_count > VPS1_MAX_WPF) {
456                 dev_err(&pdev->dev, "invalid number of WPF (%u)\n",
457                         pdata->wpf_count);
458                 return -EINVAL;
459         }
460 
461         return 0;
462 }
463 
464 static struct vsp1_platform_data *
465 vsp1_get_platform_data(struct platform_device *pdev)
466 {
467         struct device_node *np = pdev->dev.of_node;
468         struct vsp1_platform_data *pdata;
469 
470         if (!IS_ENABLED(CONFIG_OF) || np == NULL)
471                 return pdev->dev.platform_data;
472 
473         pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
474         if (pdata == NULL)
475                 return NULL;
476 
477         if (of_property_read_bool(np, "renesas,has-lif"))
478                 pdata->features |= VSP1_HAS_LIF;
479         if (of_property_read_bool(np, "renesas,has-lut"))
480                 pdata->features |= VSP1_HAS_LUT;
481         if (of_property_read_bool(np, "renesas,has-sru"))
482                 pdata->features |= VSP1_HAS_SRU;
483 
484         of_property_read_u32(np, "renesas,#rpf", &pdata->rpf_count);
485         of_property_read_u32(np, "renesas,#uds", &pdata->uds_count);
486         of_property_read_u32(np, "renesas,#wpf", &pdata->wpf_count);
487 
488         return pdata;
489 }
490 
491 static int vsp1_probe(struct platform_device *pdev)
492 {
493         struct vsp1_device *vsp1;
494         struct resource *irq;
495         struct resource *io;
496         int ret;
497 
498         vsp1 = devm_kzalloc(&pdev->dev, sizeof(*vsp1), GFP_KERNEL);
499         if (vsp1 == NULL)
500                 return -ENOMEM;
501 
502         vsp1->dev = &pdev->dev;
503         mutex_init(&vsp1->lock);
504         INIT_LIST_HEAD(&vsp1->entities);
505 
506         vsp1->pdata = vsp1_get_platform_data(pdev);
507         if (vsp1->pdata == NULL)
508                 return -ENODEV;
509 
510         ret = vsp1_validate_platform_data(pdev, vsp1->pdata);
511         if (ret < 0)
512                 return ret;
513 
514         /* I/O, IRQ and clock resources */
515         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
516         vsp1->mmio = devm_ioremap_resource(&pdev->dev, io);
517         if (IS_ERR(vsp1->mmio))
518                 return PTR_ERR(vsp1->mmio);
519 
520         vsp1->clock = devm_clk_get(&pdev->dev, NULL);
521         if (IS_ERR(vsp1->clock)) {
522                 dev_err(&pdev->dev, "failed to get clock\n");
523                 return PTR_ERR(vsp1->clock);
524         }
525 
526         irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
527         if (!irq) {
528                 dev_err(&pdev->dev, "missing IRQ\n");
529                 return -EINVAL;
530         }
531 
532         ret = devm_request_irq(&pdev->dev, irq->start, vsp1_irq_handler,
533                               IRQF_SHARED, dev_name(&pdev->dev), vsp1);
534         if (ret < 0) {
535                 dev_err(&pdev->dev, "failed to request IRQ\n");
536                 return ret;
537         }
538 
539         /* Instanciate entities */
540         ret = vsp1_create_entities(vsp1);
541         if (ret < 0) {
542                 dev_err(&pdev->dev, "failed to create entities\n");
543                 return ret;
544         }
545 
546         platform_set_drvdata(pdev, vsp1);
547 
548         return 0;
549 }
550 
551 static int vsp1_remove(struct platform_device *pdev)
552 {
553         struct vsp1_device *vsp1 = platform_get_drvdata(pdev);
554 
555         vsp1_destroy_entities(vsp1);
556 
557         return 0;
558 }
559 
560 static const struct of_device_id vsp1_of_match[] = {
561         { .compatible = "renesas,vsp1" },
562         { },
563 };
564 
565 static struct platform_driver vsp1_platform_driver = {
566         .probe          = vsp1_probe,
567         .remove         = vsp1_remove,
568         .driver         = {
569                 .owner  = THIS_MODULE,
570                 .name   = "vsp1",
571                 .pm     = &vsp1_pm_ops,
572                 .of_match_table = vsp1_of_match,
573         },
574 };
575 
576 module_platform_driver(vsp1_platform_driver);
577 
578 MODULE_ALIAS("vsp1");
579 MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
580 MODULE_DESCRIPTION("Renesas VSP1 Driver");
581 MODULE_LICENSE("GPL");
582 

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