Version:  2.0.40 2.2.26 2.4.37 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 3.17 3.18 3.19 4.0

Linux/drivers/staging/media/omap4iss/iss.c

  1 /*
  2  * TI OMAP4 ISS V4L2 Driver
  3  *
  4  * Copyright (C) 2012, Texas Instruments
  5  *
  6  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.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/dma-mapping.h>
 18 #include <linux/i2c.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/module.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/slab.h>
 23 #include <linux/sched.h>
 24 #include <linux/vmalloc.h>
 25 
 26 #include <media/v4l2-common.h>
 27 #include <media/v4l2-device.h>
 28 #include <media/v4l2-ctrls.h>
 29 
 30 #include "iss.h"
 31 #include "iss_regs.h"
 32 
 33 #define ISS_PRINT_REGISTER(iss, name)\
 34         dev_dbg(iss->dev, "###ISS " #name "=0x%08x\n", \
 35                 iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_##name))
 36 
 37 static void iss_print_status(struct iss_device *iss)
 38 {
 39         dev_dbg(iss->dev, "-------------ISS HL Register dump-------------\n");
 40 
 41         ISS_PRINT_REGISTER(iss, HL_REVISION);
 42         ISS_PRINT_REGISTER(iss, HL_SYSCONFIG);
 43         ISS_PRINT_REGISTER(iss, HL_IRQSTATUS(5));
 44         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_SET(5));
 45         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_CLR(5));
 46         ISS_PRINT_REGISTER(iss, CTRL);
 47         ISS_PRINT_REGISTER(iss, CLKCTRL);
 48         ISS_PRINT_REGISTER(iss, CLKSTAT);
 49 
 50         dev_dbg(iss->dev, "-----------------------------------------------\n");
 51 }
 52 
 53 /*
 54  * omap4iss_flush - Post pending L3 bus writes by doing a register readback
 55  * @iss: OMAP4 ISS device
 56  *
 57  * In order to force posting of pending writes, we need to write and
 58  * readback the same register, in this case the revision register.
 59  *
 60  * See this link for reference:
 61  *   http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
 62  */
 63 void omap4iss_flush(struct iss_device *iss)
 64 {
 65         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION, 0);
 66         iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
 67 }
 68 
 69 /*
 70  * iss_isp_enable_interrupts - Enable ISS ISP interrupts.
 71  * @iss: OMAP4 ISS device
 72  */
 73 static void omap4iss_isp_enable_interrupts(struct iss_device *iss)
 74 {
 75         static const u32 isp_irq = ISP5_IRQ_OCP_ERR |
 76                                    ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
 77                                    ISP5_IRQ_RSZ_FIFO_OVF |
 78                                    ISP5_IRQ_RSZ_INT_DMA |
 79                                    ISP5_IRQ_ISIF_INT(0);
 80 
 81         /* Enable ISP interrupts */
 82         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0), isp_irq);
 83         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_SET(0),
 84                       isp_irq);
 85 }
 86 
 87 /*
 88  * iss_isp_disable_interrupts - Disable ISS interrupts.
 89  * @iss: OMAP4 ISS device
 90  */
 91 static void omap4iss_isp_disable_interrupts(struct iss_device *iss)
 92 {
 93         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_CLR(0), ~0);
 94 }
 95 
 96 /*
 97  * iss_enable_interrupts - Enable ISS interrupts.
 98  * @iss: OMAP4 ISS device
 99  */
100 static void iss_enable_interrupts(struct iss_device *iss)
101 {
102         static const u32 hl_irq = ISS_HL_IRQ_CSIA | ISS_HL_IRQ_CSIB
103                                 | ISS_HL_IRQ_ISP(0);
104 
105         /* Enable HL interrupts */
106         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), hl_irq);
107         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_SET(5), hl_irq);
108 
109         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
110                 omap4iss_isp_enable_interrupts(iss);
111 }
112 
113 /*
114  * iss_disable_interrupts - Disable ISS interrupts.
115  * @iss: OMAP4 ISS device
116  */
117 static void iss_disable_interrupts(struct iss_device *iss)
118 {
119         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
120                 omap4iss_isp_disable_interrupts(iss);
121 
122         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_CLR(5), ~0);
123 }
124 
125 int omap4iss_get_external_info(struct iss_pipeline *pipe,
126                                struct media_link *link)
127 {
128         struct iss_device *iss =
129                 container_of(pipe, struct iss_video, pipe)->iss;
130         struct v4l2_subdev_format fmt;
131         struct v4l2_ctrl *ctrl;
132         int ret;
133 
134         if (!pipe->external)
135                 return 0;
136 
137         if (pipe->external_rate)
138                 return 0;
139 
140         memset(&fmt, 0, sizeof(fmt));
141 
142         fmt.pad = link->source->index;
143         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
144         ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(link->sink->entity),
145                                pad, get_fmt, NULL, &fmt);
146         if (ret < 0)
147                 return -EPIPE;
148 
149         pipe->external_bpp = omap4iss_video_format_info(fmt.format.code)->bpp;
150 
151         ctrl = v4l2_ctrl_find(pipe->external->ctrl_handler,
152                               V4L2_CID_PIXEL_RATE);
153         if (ctrl == NULL) {
154                 dev_warn(iss->dev, "no pixel rate control in subdev %s\n",
155                          pipe->external->name);
156                 return -EPIPE;
157         }
158 
159         pipe->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
160 
161         return 0;
162 }
163 
164 /*
165  * Configure the bridge. Valid inputs are
166  *
167  * IPIPEIF_INPUT_CSI2A: CSI2a receiver
168  * IPIPEIF_INPUT_CSI2B: CSI2b receiver
169  *
170  * The bridge and lane shifter are configured according to the selected input
171  * and the ISP platform data.
172  */
173 void omap4iss_configure_bridge(struct iss_device *iss,
174                                enum ipipeif_input_entity input)
175 {
176         u32 issctrl_val;
177         u32 isp5ctrl_val;
178 
179         issctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL);
180         issctrl_val &= ~ISS_CTRL_INPUT_SEL_MASK;
181         issctrl_val &= ~ISS_CTRL_CLK_DIV_MASK;
182 
183         isp5ctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL);
184 
185         switch (input) {
186         case IPIPEIF_INPUT_CSI2A:
187                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2A;
188                 break;
189 
190         case IPIPEIF_INPUT_CSI2B:
191                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2B;
192                 break;
193 
194         default:
195                 return;
196         }
197 
198         issctrl_val |= ISS_CTRL_SYNC_DETECT_VS_RAISING;
199 
200         isp5ctrl_val |= ISP5_CTRL_VD_PULSE_EXT | ISP5_CTRL_PSYNC_CLK_SEL |
201                         ISP5_CTRL_SYNC_ENABLE;
202 
203         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL, issctrl_val);
204         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, isp5ctrl_val);
205 }
206 
207 #ifdef ISS_ISR_DEBUG
208 static void iss_isr_dbg(struct iss_device *iss, u32 irqstatus)
209 {
210         static const char * const name[] = {
211                 "ISP_0",
212                 "ISP_1",
213                 "ISP_2",
214                 "ISP_3",
215                 "CSIA",
216                 "CSIB",
217                 "CCP2_0",
218                 "CCP2_1",
219                 "CCP2_2",
220                 "CCP2_3",
221                 "CBUFF",
222                 "BTE",
223                 "SIMCOP_0",
224                 "SIMCOP_1",
225                 "SIMCOP_2",
226                 "SIMCOP_3",
227                 "CCP2_8",
228                 "HS_VS",
229                 "18",
230                 "19",
231                 "20",
232                 "21",
233                 "22",
234                 "23",
235                 "24",
236                 "25",
237                 "26",
238                 "27",
239                 "28",
240                 "29",
241                 "30",
242                 "31",
243         };
244         unsigned int i;
245 
246         dev_dbg(iss->dev, "ISS IRQ: ");
247 
248         for (i = 0; i < ARRAY_SIZE(name); i++) {
249                 if ((1 << i) & irqstatus)
250                         pr_cont("%s ", name[i]);
251         }
252         pr_cont("\n");
253 }
254 
255 static void iss_isp_isr_dbg(struct iss_device *iss, u32 irqstatus)
256 {
257         static const char * const name[] = {
258                 "ISIF_0",
259                 "ISIF_1",
260                 "ISIF_2",
261                 "ISIF_3",
262                 "IPIPEREQ",
263                 "IPIPELAST_PIX",
264                 "IPIPEDMA",
265                 "IPIPEBSC",
266                 "IPIPEHST",
267                 "IPIPEIF",
268                 "AEW",
269                 "AF",
270                 "H3A",
271                 "RSZ_REG",
272                 "RSZ_LAST_PIX",
273                 "RSZ_DMA",
274                 "RSZ_CYC_RZA",
275                 "RSZ_CYC_RZB",
276                 "RSZ_FIFO_OVF",
277                 "RSZ_FIFO_IN_BLK_ERR",
278                 "20",
279                 "21",
280                 "RSZ_EOF0",
281                 "RSZ_EOF1",
282                 "H3A_EOF",
283                 "IPIPE_EOF",
284                 "26",
285                 "IPIPE_DPC_INI",
286                 "IPIPE_DPC_RNEW0",
287                 "IPIPE_DPC_RNEW1",
288                 "30",
289                 "OCP_ERR",
290         };
291         unsigned int i;
292 
293         dev_dbg(iss->dev, "ISP IRQ: ");
294 
295         for (i = 0; i < ARRAY_SIZE(name); i++) {
296                 if ((1 << i) & irqstatus)
297                         pr_cont("%s ", name[i]);
298         }
299         pr_cont("\n");
300 }
301 #endif
302 
303 /*
304  * iss_isr - Interrupt Service Routine for ISS module.
305  * @irq: Not used currently.
306  * @_iss: Pointer to the OMAP4 ISS device
307  *
308  * Handles the corresponding callback if plugged in.
309  *
310  * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
311  * IRQ wasn't handled.
312  */
313 static irqreturn_t iss_isr(int irq, void *_iss)
314 {
315         static const u32 ipipeif_events = ISP5_IRQ_IPIPEIF_IRQ |
316                                           ISP5_IRQ_ISIF_INT(0);
317         static const u32 resizer_events = ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
318                                           ISP5_IRQ_RSZ_FIFO_OVF |
319                                           ISP5_IRQ_RSZ_INT_DMA;
320         struct iss_device *iss = _iss;
321         u32 irqstatus;
322 
323         irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5));
324         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), irqstatus);
325 
326         if (irqstatus & ISS_HL_IRQ_CSIA)
327                 omap4iss_csi2_isr(&iss->csi2a);
328 
329         if (irqstatus & ISS_HL_IRQ_CSIB)
330                 omap4iss_csi2_isr(&iss->csi2b);
331 
332         if (irqstatus & ISS_HL_IRQ_ISP(0)) {
333                 u32 isp_irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
334                                                  ISP5_IRQSTATUS(0));
335                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0),
336                               isp_irqstatus);
337 
338                 if (isp_irqstatus & ISP5_IRQ_OCP_ERR)
339                         dev_dbg(iss->dev, "ISP5 OCP Error!\n");
340 
341                 if (isp_irqstatus & ipipeif_events) {
342                         omap4iss_ipipeif_isr(&iss->ipipeif,
343                                              isp_irqstatus & ipipeif_events);
344                 }
345 
346                 if (isp_irqstatus & resizer_events)
347                         omap4iss_resizer_isr(&iss->resizer,
348                                              isp_irqstatus & resizer_events);
349 
350 #ifdef ISS_ISR_DEBUG
351                 iss_isp_isr_dbg(iss, isp_irqstatus);
352 #endif
353         }
354 
355         omap4iss_flush(iss);
356 
357 #ifdef ISS_ISR_DEBUG
358         iss_isr_dbg(iss, irqstatus);
359 #endif
360 
361         return IRQ_HANDLED;
362 }
363 
364 /* -----------------------------------------------------------------------------
365  * Pipeline power management
366  *
367  * Entities must be powered up when part of a pipeline that contains at least
368  * one open video device node.
369  *
370  * To achieve this use the entity use_count field to track the number of users.
371  * For entities corresponding to video device nodes the use_count field stores
372  * the users count of the node. For entities corresponding to subdevs the
373  * use_count field stores the total number of users of all video device nodes
374  * in the pipeline.
375  *
376  * The omap4iss_pipeline_pm_use() function must be called in the open() and
377  * close() handlers of video device nodes. It increments or decrements the use
378  * count of all subdev entities in the pipeline.
379  *
380  * To react to link management on powered pipelines, the link setup notification
381  * callback updates the use count of all entities in the source and sink sides
382  * of the link.
383  */
384 
385 /*
386  * iss_pipeline_pm_use_count - Count the number of users of a pipeline
387  * @entity: The entity
388  *
389  * Return the total number of users of all video device nodes in the pipeline.
390  */
391 static int iss_pipeline_pm_use_count(struct media_entity *entity)
392 {
393         struct media_entity_graph graph;
394         int use = 0;
395 
396         media_entity_graph_walk_start(&graph, entity);
397 
398         while ((entity = media_entity_graph_walk_next(&graph))) {
399                 if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
400                         use += entity->use_count;
401         }
402 
403         return use;
404 }
405 
406 /*
407  * iss_pipeline_pm_power_one - Apply power change to an entity
408  * @entity: The entity
409  * @change: Use count change
410  *
411  * Change the entity use count by @change. If the entity is a subdev update its
412  * power state by calling the core::s_power operation when the use count goes
413  * from 0 to != 0 or from != 0 to 0.
414  *
415  * Return 0 on success or a negative error code on failure.
416  */
417 static int iss_pipeline_pm_power_one(struct media_entity *entity, int change)
418 {
419         struct v4l2_subdev *subdev;
420 
421         subdev = media_entity_type(entity) == MEDIA_ENT_T_V4L2_SUBDEV
422                ? media_entity_to_v4l2_subdev(entity) : NULL;
423 
424         if (entity->use_count == 0 && change > 0 && subdev != NULL) {
425                 int ret;
426 
427                 ret = v4l2_subdev_call(subdev, core, s_power, 1);
428                 if (ret < 0 && ret != -ENOIOCTLCMD)
429                         return ret;
430         }
431 
432         entity->use_count += change;
433         WARN_ON(entity->use_count < 0);
434 
435         if (entity->use_count == 0 && change < 0 && subdev != NULL)
436                 v4l2_subdev_call(subdev, core, s_power, 0);
437 
438         return 0;
439 }
440 
441 /*
442  * iss_pipeline_pm_power - Apply power change to all entities in a pipeline
443  * @entity: The entity
444  * @change: Use count change
445  *
446  * Walk the pipeline to update the use count and the power state of all non-node
447  * entities.
448  *
449  * Return 0 on success or a negative error code on failure.
450  */
451 static int iss_pipeline_pm_power(struct media_entity *entity, int change)
452 {
453         struct media_entity_graph graph;
454         struct media_entity *first = entity;
455         int ret = 0;
456 
457         if (!change)
458                 return 0;
459 
460         media_entity_graph_walk_start(&graph, entity);
461 
462         while (!ret && (entity = media_entity_graph_walk_next(&graph)))
463                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
464                         ret = iss_pipeline_pm_power_one(entity, change);
465 
466         if (!ret)
467                 return 0;
468 
469         media_entity_graph_walk_start(&graph, first);
470 
471         while ((first = media_entity_graph_walk_next(&graph))
472                && first != entity)
473                 if (media_entity_type(first) != MEDIA_ENT_T_DEVNODE)
474                         iss_pipeline_pm_power_one(first, -change);
475 
476         return ret;
477 }
478 
479 /*
480  * omap4iss_pipeline_pm_use - Update the use count of an entity
481  * @entity: The entity
482  * @use: Use (1) or stop using (0) the entity
483  *
484  * Update the use count of all entities in the pipeline and power entities on or
485  * off accordingly.
486  *
487  * Return 0 on success or a negative error code on failure. Powering entities
488  * off is assumed to never fail. No failure can occur when the use parameter is
489  * set to 0.
490  */
491 int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
492 {
493         int change = use ? 1 : -1;
494         int ret;
495 
496         mutex_lock(&entity->parent->graph_mutex);
497 
498         /* Apply use count to node. */
499         entity->use_count += change;
500         WARN_ON(entity->use_count < 0);
501 
502         /* Apply power change to connected non-nodes. */
503         ret = iss_pipeline_pm_power(entity, change);
504         if (ret < 0)
505                 entity->use_count -= change;
506 
507         mutex_unlock(&entity->parent->graph_mutex);
508 
509         return ret;
510 }
511 
512 /*
513  * iss_pipeline_link_notify - Link management notification callback
514  * @link: The link
515  * @flags: New link flags that will be applied
516  *
517  * React to link management on powered pipelines by updating the use count of
518  * all entities in the source and sink sides of the link. Entities are powered
519  * on or off accordingly.
520  *
521  * Return 0 on success or a negative error code on failure. Powering entities
522  * off is assumed to never fail. This function will not fail for disconnection
523  * events.
524  */
525 static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
526                                     unsigned int notification)
527 {
528         struct media_entity *source = link->source->entity;
529         struct media_entity *sink = link->sink->entity;
530         int source_use = iss_pipeline_pm_use_count(source);
531         int sink_use = iss_pipeline_pm_use_count(sink);
532         int ret;
533 
534         if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
535             !(link->flags & MEDIA_LNK_FL_ENABLED)) {
536                 /* Powering off entities is assumed to never fail. */
537                 iss_pipeline_pm_power(source, -sink_use);
538                 iss_pipeline_pm_power(sink, -source_use);
539                 return 0;
540         }
541 
542         if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
543                 (flags & MEDIA_LNK_FL_ENABLED)) {
544                 ret = iss_pipeline_pm_power(source, sink_use);
545                 if (ret < 0)
546                         return ret;
547 
548                 ret = iss_pipeline_pm_power(sink, source_use);
549                 if (ret < 0)
550                         iss_pipeline_pm_power(source, -sink_use);
551 
552                 return ret;
553         }
554 
555         return 0;
556 }
557 
558 /* -----------------------------------------------------------------------------
559  * Pipeline stream management
560  */
561 
562 /*
563  * iss_pipeline_disable - Disable streaming on a pipeline
564  * @pipe: ISS pipeline
565  * @until: entity at which to stop pipeline walk
566  *
567  * Walk the entities chain starting at the pipeline output video node and stop
568  * all modules in the chain. Wait synchronously for the modules to be stopped if
569  * necessary.
570  *
571  * If the until argument isn't NULL, stop the pipeline walk when reaching the
572  * until entity. This is used to disable a partially started pipeline due to a
573  * subdev start error.
574  */
575 static int iss_pipeline_disable(struct iss_pipeline *pipe,
576                                 struct media_entity *until)
577 {
578         struct iss_device *iss = pipe->output->iss;
579         struct media_entity *entity;
580         struct media_pad *pad;
581         struct v4l2_subdev *subdev;
582         int failure = 0;
583         int ret;
584 
585         entity = &pipe->output->video.entity;
586         while (1) {
587                 pad = &entity->pads[0];
588                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
589                         break;
590 
591                 pad = media_entity_remote_pad(pad);
592                 if (pad == NULL ||
593                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
594                         break;
595 
596                 entity = pad->entity;
597                 if (entity == until)
598                         break;
599 
600                 subdev = media_entity_to_v4l2_subdev(entity);
601                 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
602                 if (ret < 0) {
603                         dev_dbg(iss->dev, "%s: module stop timeout.\n",
604                                 subdev->name);
605                         /* If the entity failed to stopped, assume it has
606                          * crashed. Mark it as such, the ISS will be reset when
607                          * applications will release it.
608                          */
609                         iss->crashed |= 1U << subdev->entity.id;
610                         failure = -ETIMEDOUT;
611                 }
612         }
613 
614         return failure;
615 }
616 
617 /*
618  * iss_pipeline_enable - Enable streaming on a pipeline
619  * @pipe: ISS pipeline
620  * @mode: Stream mode (single shot or continuous)
621  *
622  * Walk the entities chain starting at the pipeline output video node and start
623  * all modules in the chain in the given mode.
624  *
625  * Return 0 if successful, or the return value of the failed video::s_stream
626  * operation otherwise.
627  */
628 static int iss_pipeline_enable(struct iss_pipeline *pipe,
629                                enum iss_pipeline_stream_state mode)
630 {
631         struct iss_device *iss = pipe->output->iss;
632         struct media_entity *entity;
633         struct media_pad *pad;
634         struct v4l2_subdev *subdev;
635         unsigned long flags;
636         int ret;
637 
638         /* If one of the entities in the pipeline has crashed it will not work
639          * properly. Refuse to start streaming in that case. This check must be
640          * performed before the loop below to avoid starting entities if the
641          * pipeline won't start anyway (those entities would then likely fail to
642          * stop, making the problem worse).
643          */
644         if (pipe->entities & iss->crashed)
645                 return -EIO;
646 
647         spin_lock_irqsave(&pipe->lock, flags);
648         pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
649         spin_unlock_irqrestore(&pipe->lock, flags);
650 
651         pipe->do_propagation = false;
652 
653         entity = &pipe->output->video.entity;
654         while (1) {
655                 pad = &entity->pads[0];
656                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
657                         break;
658 
659                 pad = media_entity_remote_pad(pad);
660                 if (pad == NULL ||
661                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
662                         break;
663 
664                 entity = pad->entity;
665                 subdev = media_entity_to_v4l2_subdev(entity);
666 
667                 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
668                 if (ret < 0 && ret != -ENOIOCTLCMD) {
669                         iss_pipeline_disable(pipe, entity);
670                         return ret;
671                 }
672 
673                 if (subdev == &iss->csi2a.subdev ||
674                     subdev == &iss->csi2b.subdev)
675                         pipe->do_propagation = true;
676         }
677 
678         iss_print_status(pipe->output->iss);
679         return 0;
680 }
681 
682 /*
683  * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
684  * @pipe: ISS pipeline
685  * @state: Stream state (stopped, single shot or continuous)
686  *
687  * Set the pipeline to the given stream state. Pipelines can be started in
688  * single-shot or continuous mode.
689  *
690  * Return 0 if successful, or the return value of the failed video::s_stream
691  * operation otherwise. The pipeline state is not updated when the operation
692  * fails, except when stopping the pipeline.
693  */
694 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
695                                  enum iss_pipeline_stream_state state)
696 {
697         int ret;
698 
699         if (state == ISS_PIPELINE_STREAM_STOPPED)
700                 ret = iss_pipeline_disable(pipe, NULL);
701         else
702                 ret = iss_pipeline_enable(pipe, state);
703 
704         if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
705                 pipe->stream_state = state;
706 
707         return ret;
708 }
709 
710 /*
711  * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
712  * @pipe: ISS pipeline
713  *
714  * Cancelling a stream mark all buffers on all video nodes in the pipeline as
715  * erroneous and makes sure no new buffer can be queued. This function is called
716  * when a fatal error that prevents any further operation on the pipeline
717  * occurs.
718  */
719 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
720 {
721         if (pipe->input)
722                 omap4iss_video_cancel_stream(pipe->input);
723         if (pipe->output)
724                 omap4iss_video_cancel_stream(pipe->output);
725 }
726 
727 /*
728  * iss_pipeline_is_last - Verify if entity has an enabled link to the output
729  *                        video node
730  * @me: ISS module's media entity
731  *
732  * Returns 1 if the entity has an enabled link to the output video node or 0
733  * otherwise. It's true only while pipeline can have no more than one output
734  * node.
735  */
736 static int iss_pipeline_is_last(struct media_entity *me)
737 {
738         struct iss_pipeline *pipe;
739         struct media_pad *pad;
740 
741         if (!me->pipe)
742                 return 0;
743         pipe = to_iss_pipeline(me);
744         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
745                 return 0;
746         pad = media_entity_remote_pad(&pipe->output->pad);
747         return pad->entity == me;
748 }
749 
750 static int iss_reset(struct iss_device *iss)
751 {
752         unsigned int timeout;
753 
754         iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
755                     ISS_HL_SYSCONFIG_SOFTRESET);
756 
757         timeout = iss_poll_condition_timeout(
758                 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
759                 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
760         if (timeout) {
761                 dev_err(iss->dev, "ISS reset timeout\n");
762                 return -ETIMEDOUT;
763         }
764 
765         iss->crashed = 0;
766         return 0;
767 }
768 
769 static int iss_isp_reset(struct iss_device *iss)
770 {
771         unsigned int timeout;
772 
773         /* Fist, ensure that the ISP is IDLE (no transactions happening) */
774         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
775                        ISP5_SYSCONFIG_STANDBYMODE_MASK,
776                        ISP5_SYSCONFIG_STANDBYMODE_SMART);
777 
778         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
779 
780         timeout = iss_poll_condition_timeout(
781                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
782                 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
783         if (timeout) {
784                 dev_err(iss->dev, "ISP5 standby timeout\n");
785                 return -ETIMEDOUT;
786         }
787 
788         /* Now finally, do the reset */
789         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
790                     ISP5_SYSCONFIG_SOFTRESET);
791 
792         timeout = iss_poll_condition_timeout(
793                 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
794                 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
795         if (timeout) {
796                 dev_err(iss->dev, "ISP5 reset timeout\n");
797                 return -ETIMEDOUT;
798         }
799 
800         return 0;
801 }
802 
803 /*
804  * iss_module_sync_idle - Helper to sync module with its idle state
805  * @me: ISS submodule's media entity
806  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
807  * @stopping: flag which tells module wants to stop
808  *
809  * This function checks if ISS submodule needs to wait for next interrupt. If
810  * yes, makes the caller to sleep while waiting for such event.
811  */
812 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
813                               atomic_t *stopping)
814 {
815         struct iss_pipeline *pipe = to_iss_pipeline(me);
816         struct iss_video *video = pipe->output;
817         unsigned long flags;
818 
819         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
820             (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
821              !iss_pipeline_ready(pipe)))
822                 return 0;
823 
824         /*
825          * atomic_set() doesn't include memory barrier on ARM platform for SMP
826          * scenario. We'll call it here to avoid race conditions.
827          */
828         atomic_set(stopping, 1);
829         smp_wmb();
830 
831         /*
832          * If module is the last one, it's writing to memory. In this case,
833          * it's necessary to check if the module is already paused due to
834          * DMA queue underrun or if it has to wait for next interrupt to be
835          * idle.
836          * If it isn't the last one, the function won't sleep but *stopping
837          * will still be set to warn next submodule caller's interrupt the
838          * module wants to be idle.
839          */
840         if (!iss_pipeline_is_last(me))
841                 return 0;
842 
843         spin_lock_irqsave(&video->qlock, flags);
844         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
845                 spin_unlock_irqrestore(&video->qlock, flags);
846                 atomic_set(stopping, 0);
847                 smp_wmb();
848                 return 0;
849         }
850         spin_unlock_irqrestore(&video->qlock, flags);
851         if (!wait_event_timeout(*wait, !atomic_read(stopping),
852                                 msecs_to_jiffies(1000))) {
853                 atomic_set(stopping, 0);
854                 smp_wmb();
855                 return -ETIMEDOUT;
856         }
857 
858         return 0;
859 }
860 
861 /*
862  * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
863  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
864  * @stopping: flag which tells module wants to stop
865  *
866  * This function checks if ISS submodule was stopping. In case of yes, it
867  * notices the caller by setting stopping to 0 and waking up the wait queue.
868  * Returns 1 if it was stopping or 0 otherwise.
869  */
870 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
871                                      atomic_t *stopping)
872 {
873         if (atomic_cmpxchg(stopping, 1, 0)) {
874                 wake_up(wait);
875                 return 1;
876         }
877 
878         return 0;
879 }
880 
881 /* --------------------------------------------------------------------------
882  * Clock management
883  */
884 
885 #define ISS_CLKCTRL_MASK        (ISS_CLKCTRL_CSI2_A |\
886                                  ISS_CLKCTRL_CSI2_B |\
887                                  ISS_CLKCTRL_ISP)
888 
889 static int __iss_subclk_update(struct iss_device *iss)
890 {
891         u32 clk = 0;
892         int ret = 0, timeout = 1000;
893 
894         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
895                 clk |= ISS_CLKCTRL_CSI2_A;
896 
897         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
898                 clk |= ISS_CLKCTRL_CSI2_B;
899 
900         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
901                 clk |= ISS_CLKCTRL_ISP;
902 
903         iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
904                        ISS_CLKCTRL_MASK, clk);
905 
906         /* Wait for HW assertion */
907         while (--timeout > 0) {
908                 udelay(1);
909                 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
910                     ISS_CLKCTRL_MASK) == clk)
911                         break;
912         }
913 
914         if (!timeout)
915                 ret = -EBUSY;
916 
917         return ret;
918 }
919 
920 int omap4iss_subclk_enable(struct iss_device *iss,
921                             enum iss_subclk_resource res)
922 {
923         iss->subclk_resources |= res;
924 
925         return __iss_subclk_update(iss);
926 }
927 
928 int omap4iss_subclk_disable(struct iss_device *iss,
929                              enum iss_subclk_resource res)
930 {
931         iss->subclk_resources &= ~res;
932 
933         return __iss_subclk_update(iss);
934 }
935 
936 #define ISS_ISP5_CLKCTRL_MASK   (ISP5_CTRL_BL_CLK_ENABLE |\
937                                  ISP5_CTRL_ISIF_CLK_ENABLE |\
938                                  ISP5_CTRL_H3A_CLK_ENABLE |\
939                                  ISP5_CTRL_RSZ_CLK_ENABLE |\
940                                  ISP5_CTRL_IPIPE_CLK_ENABLE |\
941                                  ISP5_CTRL_IPIPEIF_CLK_ENABLE)
942 
943 static void __iss_isp_subclk_update(struct iss_device *iss)
944 {
945         u32 clk = 0;
946 
947         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
948                 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
949 
950         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
951                 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
952 
953         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
954                 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
955 
956         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
957                 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
958 
959         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
960                 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
961 
962         if (clk)
963                 clk |= ISP5_CTRL_BL_CLK_ENABLE;
964 
965         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
966                        ISS_ISP5_CLKCTRL_MASK, clk);
967 }
968 
969 void omap4iss_isp_subclk_enable(struct iss_device *iss,
970                                 enum iss_isp_subclk_resource res)
971 {
972         iss->isp_subclk_resources |= res;
973 
974         __iss_isp_subclk_update(iss);
975 }
976 
977 void omap4iss_isp_subclk_disable(struct iss_device *iss,
978                                  enum iss_isp_subclk_resource res)
979 {
980         iss->isp_subclk_resources &= ~res;
981 
982         __iss_isp_subclk_update(iss);
983 }
984 
985 /*
986  * iss_enable_clocks - Enable ISS clocks
987  * @iss: OMAP4 ISS device
988  *
989  * Return 0 if successful, or clk_enable return value if any of tthem fails.
990  */
991 static int iss_enable_clocks(struct iss_device *iss)
992 {
993         int ret;
994 
995         ret = clk_enable(iss->iss_fck);
996         if (ret) {
997                 dev_err(iss->dev, "clk_enable iss_fck failed\n");
998                 return ret;
999         }
1000 
1001         ret = clk_enable(iss->iss_ctrlclk);
1002         if (ret) {
1003                 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
1004                 clk_disable(iss->iss_fck);
1005                 return ret;
1006         }
1007 
1008         return 0;
1009 }
1010 
1011 /*
1012  * iss_disable_clocks - Disable ISS clocks
1013  * @iss: OMAP4 ISS device
1014  */
1015 static void iss_disable_clocks(struct iss_device *iss)
1016 {
1017         clk_disable(iss->iss_ctrlclk);
1018         clk_disable(iss->iss_fck);
1019 }
1020 
1021 static int iss_get_clocks(struct iss_device *iss)
1022 {
1023         iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
1024         if (IS_ERR(iss->iss_fck)) {
1025                 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
1026                 return PTR_ERR(iss->iss_fck);
1027         }
1028 
1029         iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
1030         if (IS_ERR(iss->iss_ctrlclk)) {
1031                 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
1032                 return PTR_ERR(iss->iss_ctrlclk);
1033         }
1034 
1035         return 0;
1036 }
1037 
1038 /*
1039  * omap4iss_get - Acquire the ISS resource.
1040  *
1041  * Initializes the clocks for the first acquire.
1042  *
1043  * Increment the reference count on the ISS. If the first reference is taken,
1044  * enable clocks and power-up all submodules.
1045  *
1046  * Return a pointer to the ISS device structure, or NULL if an error occurred.
1047  */
1048 struct iss_device *omap4iss_get(struct iss_device *iss)
1049 {
1050         struct iss_device *__iss = iss;
1051 
1052         if (iss == NULL)
1053                 return NULL;
1054 
1055         mutex_lock(&iss->iss_mutex);
1056         if (iss->ref_count > 0)
1057                 goto out;
1058 
1059         if (iss_enable_clocks(iss) < 0) {
1060                 __iss = NULL;
1061                 goto out;
1062         }
1063 
1064         iss_enable_interrupts(iss);
1065 
1066 out:
1067         if (__iss != NULL)
1068                 iss->ref_count++;
1069         mutex_unlock(&iss->iss_mutex);
1070 
1071         return __iss;
1072 }
1073 
1074 /*
1075  * omap4iss_put - Release the ISS
1076  *
1077  * Decrement the reference count on the ISS. If the last reference is released,
1078  * power-down all submodules, disable clocks and free temporary buffers.
1079  */
1080 void omap4iss_put(struct iss_device *iss)
1081 {
1082         if (iss == NULL)
1083                 return;
1084 
1085         mutex_lock(&iss->iss_mutex);
1086         BUG_ON(iss->ref_count == 0);
1087         if (--iss->ref_count == 0) {
1088                 iss_disable_interrupts(iss);
1089                 /* Reset the ISS if an entity has failed to stop. This is the
1090                  * only way to recover from such conditions, although it would
1091                  * be worth investigating whether resetting the ISP only can't
1092                  * fix the problem in some cases.
1093                  */
1094                 if (iss->crashed)
1095                         iss_reset(iss);
1096                 iss_disable_clocks(iss);
1097         }
1098         mutex_unlock(&iss->iss_mutex);
1099 }
1100 
1101 static int iss_map_mem_resource(struct platform_device *pdev,
1102                                 struct iss_device *iss,
1103                                 enum iss_mem_resources res)
1104 {
1105         struct resource *mem;
1106 
1107         mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
1108 
1109         iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
1110 
1111         return PTR_ERR_OR_ZERO(iss->regs[res]);
1112 }
1113 
1114 static void iss_unregister_entities(struct iss_device *iss)
1115 {
1116         omap4iss_resizer_unregister_entities(&iss->resizer);
1117         omap4iss_ipipe_unregister_entities(&iss->ipipe);
1118         omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
1119         omap4iss_csi2_unregister_entities(&iss->csi2a);
1120         omap4iss_csi2_unregister_entities(&iss->csi2b);
1121 
1122         v4l2_device_unregister(&iss->v4l2_dev);
1123         media_device_unregister(&iss->media_dev);
1124 }
1125 
1126 /*
1127  * iss_register_subdev_group - Register a group of subdevices
1128  * @iss: OMAP4 ISS device
1129  * @board_info: I2C subdevs board information array
1130  *
1131  * Register all I2C subdevices in the board_info array. The array must be
1132  * terminated by a NULL entry, and the first entry must be the sensor.
1133  *
1134  * Return a pointer to the sensor media entity if it has been successfully
1135  * registered, or NULL otherwise.
1136  */
1137 static struct v4l2_subdev *
1138 iss_register_subdev_group(struct iss_device *iss,
1139                      struct iss_subdev_i2c_board_info *board_info)
1140 {
1141         struct v4l2_subdev *sensor = NULL;
1142         unsigned int first;
1143 
1144         if (board_info->board_info == NULL)
1145                 return NULL;
1146 
1147         for (first = 1; board_info->board_info; ++board_info, first = 0) {
1148                 struct v4l2_subdev *subdev;
1149                 struct i2c_adapter *adapter;
1150 
1151                 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
1152                 if (adapter == NULL) {
1153                         dev_err(iss->dev,
1154                                 "%s: Unable to get I2C adapter %d for device %s\n",
1155                                 __func__, board_info->i2c_adapter_id,
1156                                 board_info->board_info->type);
1157                         continue;
1158                 }
1159 
1160                 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
1161                                 board_info->board_info, NULL);
1162                 if (subdev == NULL) {
1163                         dev_err(iss->dev, "%s: Unable to register subdev %s\n",
1164                                 __func__, board_info->board_info->type);
1165                         continue;
1166                 }
1167 
1168                 if (first)
1169                         sensor = subdev;
1170         }
1171 
1172         return sensor;
1173 }
1174 
1175 static int iss_register_entities(struct iss_device *iss)
1176 {
1177         struct iss_platform_data *pdata = iss->pdata;
1178         struct iss_v4l2_subdevs_group *subdevs;
1179         int ret;
1180 
1181         iss->media_dev.dev = iss->dev;
1182         strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
1183                 sizeof(iss->media_dev.model));
1184         iss->media_dev.hw_revision = iss->revision;
1185         iss->media_dev.link_notify = iss_pipeline_link_notify;
1186         ret = media_device_register(&iss->media_dev);
1187         if (ret < 0) {
1188                 dev_err(iss->dev, "%s: Media device registration failed (%d)\n",
1189                         __func__, ret);
1190                 return ret;
1191         }
1192 
1193         iss->v4l2_dev.mdev = &iss->media_dev;
1194         ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1195         if (ret < 0) {
1196                 dev_err(iss->dev, "%s: V4L2 device registration failed (%d)\n",
1197                         __func__, ret);
1198                 goto done;
1199         }
1200 
1201         /* Register internal entities */
1202         ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1203         if (ret < 0)
1204                 goto done;
1205 
1206         ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1207         if (ret < 0)
1208                 goto done;
1209 
1210         ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1211         if (ret < 0)
1212                 goto done;
1213 
1214         ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1215         if (ret < 0)
1216                 goto done;
1217 
1218         ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1219         if (ret < 0)
1220                 goto done;
1221 
1222         /* Register external entities */
1223         for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1224                 struct v4l2_subdev *sensor;
1225                 struct media_entity *input;
1226                 unsigned int flags;
1227                 unsigned int pad;
1228 
1229                 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1230                 if (sensor == NULL)
1231                         continue;
1232 
1233                 sensor->host_priv = subdevs;
1234 
1235                 /* Connect the sensor to the correct interface module.
1236                  * CSI2a receiver through CSIPHY1, or
1237                  * CSI2b receiver through CSIPHY2
1238                  */
1239                 switch (subdevs->interface) {
1240                 case ISS_INTERFACE_CSI2A_PHY1:
1241                         input = &iss->csi2a.subdev.entity;
1242                         pad = CSI2_PAD_SINK;
1243                         flags = MEDIA_LNK_FL_IMMUTABLE
1244                               | MEDIA_LNK_FL_ENABLED;
1245                         break;
1246 
1247                 case ISS_INTERFACE_CSI2B_PHY2:
1248                         input = &iss->csi2b.subdev.entity;
1249                         pad = CSI2_PAD_SINK;
1250                         flags = MEDIA_LNK_FL_IMMUTABLE
1251                               | MEDIA_LNK_FL_ENABLED;
1252                         break;
1253 
1254                 default:
1255                         dev_err(iss->dev, "%s: invalid interface type %u\n",
1256                                 __func__, subdevs->interface);
1257                         ret = -EINVAL;
1258                         goto done;
1259                 }
1260 
1261                 ret = media_entity_create_link(&sensor->entity, 0, input, pad,
1262                                                flags);
1263                 if (ret < 0)
1264                         goto done;
1265         }
1266 
1267         ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1268 
1269 done:
1270         if (ret < 0)
1271                 iss_unregister_entities(iss);
1272 
1273         return ret;
1274 }
1275 
1276 static void iss_cleanup_modules(struct iss_device *iss)
1277 {
1278         omap4iss_csi2_cleanup(iss);
1279         omap4iss_ipipeif_cleanup(iss);
1280         omap4iss_ipipe_cleanup(iss);
1281         omap4iss_resizer_cleanup(iss);
1282 }
1283 
1284 static int iss_initialize_modules(struct iss_device *iss)
1285 {
1286         int ret;
1287 
1288         ret = omap4iss_csiphy_init(iss);
1289         if (ret < 0) {
1290                 dev_err(iss->dev, "CSI PHY initialization failed\n");
1291                 goto error_csiphy;
1292         }
1293 
1294         ret = omap4iss_csi2_init(iss);
1295         if (ret < 0) {
1296                 dev_err(iss->dev, "CSI2 initialization failed\n");
1297                 goto error_csi2;
1298         }
1299 
1300         ret = omap4iss_ipipeif_init(iss);
1301         if (ret < 0) {
1302                 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1303                 goto error_ipipeif;
1304         }
1305 
1306         ret = omap4iss_ipipe_init(iss);
1307         if (ret < 0) {
1308                 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1309                 goto error_ipipe;
1310         }
1311 
1312         ret = omap4iss_resizer_init(iss);
1313         if (ret < 0) {
1314                 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1315                 goto error_resizer;
1316         }
1317 
1318         /* Connect the submodules. */
1319         ret = media_entity_create_link(
1320                         &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1321                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1322         if (ret < 0)
1323                 goto error_link;
1324 
1325         ret = media_entity_create_link(
1326                         &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1327                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1328         if (ret < 0)
1329                 goto error_link;
1330 
1331         ret = media_entity_create_link(
1332                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1333                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1334         if (ret < 0)
1335                 goto error_link;
1336 
1337         ret = media_entity_create_link(
1338                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1339                         &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1340         if (ret < 0)
1341                 goto error_link;
1342 
1343         ret = media_entity_create_link(
1344                         &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1345                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1346         if (ret < 0)
1347                 goto error_link;
1348 
1349         return 0;
1350 
1351 error_link:
1352         omap4iss_resizer_cleanup(iss);
1353 error_resizer:
1354         omap4iss_ipipe_cleanup(iss);
1355 error_ipipe:
1356         omap4iss_ipipeif_cleanup(iss);
1357 error_ipipeif:
1358         omap4iss_csi2_cleanup(iss);
1359 error_csi2:
1360 error_csiphy:
1361         return ret;
1362 }
1363 
1364 static int iss_probe(struct platform_device *pdev)
1365 {
1366         struct iss_platform_data *pdata = pdev->dev.platform_data;
1367         struct iss_device *iss;
1368         unsigned int i;
1369         int ret;
1370 
1371         if (pdata == NULL)
1372                 return -EINVAL;
1373 
1374         iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1375         if (!iss)
1376                 return -ENOMEM;
1377 
1378         mutex_init(&iss->iss_mutex);
1379 
1380         iss->dev = &pdev->dev;
1381         iss->pdata = pdata;
1382 
1383         iss->raw_dmamask = DMA_BIT_MASK(32);
1384         iss->dev->dma_mask = &iss->raw_dmamask;
1385         iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1386 
1387         platform_set_drvdata(pdev, iss);
1388 
1389         /* Clocks */
1390         ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1391         if (ret < 0)
1392                 goto error;
1393 
1394         ret = iss_get_clocks(iss);
1395         if (ret < 0)
1396                 goto error;
1397 
1398         if (omap4iss_get(iss) == NULL)
1399                 goto error;
1400 
1401         ret = iss_reset(iss);
1402         if (ret < 0)
1403                 goto error_iss;
1404 
1405         iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1406         dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1407 
1408         for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1409                 ret = iss_map_mem_resource(pdev, iss, i);
1410                 if (ret)
1411                         goto error_iss;
1412         }
1413 
1414         /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1415         iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1416                        BTE_CTRL_BW_LIMITER_MASK,
1417                        18 << BTE_CTRL_BW_LIMITER_SHIFT);
1418 
1419         /* Perform ISP reset */
1420         ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1421         if (ret < 0)
1422                 goto error_iss;
1423 
1424         ret = iss_isp_reset(iss);
1425         if (ret < 0)
1426                 goto error_iss;
1427 
1428         dev_info(iss->dev, "ISP Revision %08x found\n",
1429                  iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1430 
1431         /* Interrupt */
1432         iss->irq_num = platform_get_irq(pdev, 0);
1433         if (iss->irq_num <= 0) {
1434                 dev_err(iss->dev, "No IRQ resource\n");
1435                 ret = -ENODEV;
1436                 goto error_iss;
1437         }
1438 
1439         if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1440                              "OMAP4 ISS", iss)) {
1441                 dev_err(iss->dev, "Unable to request IRQ\n");
1442                 ret = -EINVAL;
1443                 goto error_iss;
1444         }
1445 
1446         /* Entities */
1447         ret = iss_initialize_modules(iss);
1448         if (ret < 0)
1449                 goto error_iss;
1450 
1451         ret = iss_register_entities(iss);
1452         if (ret < 0)
1453                 goto error_modules;
1454 
1455         omap4iss_put(iss);
1456 
1457         return 0;
1458 
1459 error_modules:
1460         iss_cleanup_modules(iss);
1461 error_iss:
1462         omap4iss_put(iss);
1463 error:
1464         platform_set_drvdata(pdev, NULL);
1465 
1466         mutex_destroy(&iss->iss_mutex);
1467 
1468         return ret;
1469 }
1470 
1471 static int iss_remove(struct platform_device *pdev)
1472 {
1473         struct iss_device *iss = platform_get_drvdata(pdev);
1474 
1475         iss_unregister_entities(iss);
1476         iss_cleanup_modules(iss);
1477 
1478         return 0;
1479 }
1480 
1481 static struct platform_device_id omap4iss_id_table[] = {
1482         { "omap4iss", 0 },
1483         { },
1484 };
1485 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1486 
1487 static struct platform_driver iss_driver = {
1488         .probe          = iss_probe,
1489         .remove         = iss_remove,
1490         .id_table       = omap4iss_id_table,
1491         .driver = {
1492                 .name   = "omap4iss",
1493         },
1494 };
1495 
1496 module_platform_driver(iss_driver);
1497 
1498 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1499 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1500 MODULE_LICENSE("GPL");
1501 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);
1502 

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