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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/mfd/syscon.h>
 21 #include <linux/module.h>
 22 #include <linux/platform_device.h>
 23 #include <linux/slab.h>
 24 #include <linux/sched.h>
 25 #include <linux/vmalloc.h>
 26 
 27 #include <media/v4l2-common.h>
 28 #include <media/v4l2-device.h>
 29 #include <media/v4l2-ctrls.h>
 30 
 31 #include "iss.h"
 32 #include "iss_regs.h"
 33 
 34 #define ISS_PRINT_REGISTER(iss, name)\
 35         dev_dbg(iss->dev, "###ISS " #name "=0x%08x\n", \
 36                 iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_##name))
 37 
 38 static void iss_print_status(struct iss_device *iss)
 39 {
 40         dev_dbg(iss->dev, "-------------ISS HL Register dump-------------\n");
 41 
 42         ISS_PRINT_REGISTER(iss, HL_REVISION);
 43         ISS_PRINT_REGISTER(iss, HL_SYSCONFIG);
 44         ISS_PRINT_REGISTER(iss, HL_IRQSTATUS(5));
 45         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_SET(5));
 46         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_CLR(5));
 47         ISS_PRINT_REGISTER(iss, CTRL);
 48         ISS_PRINT_REGISTER(iss, CLKCTRL);
 49         ISS_PRINT_REGISTER(iss, CLKSTAT);
 50 
 51         dev_dbg(iss->dev, "-----------------------------------------------\n");
 52 }
 53 
 54 /*
 55  * omap4iss_flush - Post pending L3 bus writes by doing a register readback
 56  * @iss: OMAP4 ISS device
 57  *
 58  * In order to force posting of pending writes, we need to write and
 59  * readback the same register, in this case the revision register.
 60  *
 61  * See this link for reference:
 62  *   http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
 63  */
 64 static void omap4iss_flush(struct iss_device *iss)
 65 {
 66         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION, 0);
 67         iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
 68 }
 69 
 70 /*
 71  * iss_isp_enable_interrupts - Enable ISS ISP interrupts.
 72  * @iss: OMAP4 ISS device
 73  */
 74 static void omap4iss_isp_enable_interrupts(struct iss_device *iss)
 75 {
 76         static const u32 isp_irq = ISP5_IRQ_OCP_ERR |
 77                                    ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
 78                                    ISP5_IRQ_RSZ_FIFO_OVF |
 79                                    ISP5_IRQ_RSZ_INT_DMA |
 80                                    ISP5_IRQ_ISIF_INT(0);
 81 
 82         /* Enable ISP interrupts */
 83         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0), isp_irq);
 84         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_SET(0),
 85                       isp_irq);
 86 }
 87 
 88 /*
 89  * iss_isp_disable_interrupts - Disable ISS interrupts.
 90  * @iss: OMAP4 ISS device
 91  */
 92 static void omap4iss_isp_disable_interrupts(struct iss_device *iss)
 93 {
 94         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_CLR(0), ~0);
 95 }
 96 
 97 /*
 98  * iss_enable_interrupts - Enable ISS interrupts.
 99  * @iss: OMAP4 ISS device
100  */
101 static void iss_enable_interrupts(struct iss_device *iss)
102 {
103         static const u32 hl_irq = ISS_HL_IRQ_CSIA | ISS_HL_IRQ_CSIB
104                                 | ISS_HL_IRQ_ISP(0);
105 
106         /* Enable HL interrupts */
107         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), hl_irq);
108         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_SET(5), hl_irq);
109 
110         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
111                 omap4iss_isp_enable_interrupts(iss);
112 }
113 
114 /*
115  * iss_disable_interrupts - Disable ISS interrupts.
116  * @iss: OMAP4 ISS device
117  */
118 static void iss_disable_interrupts(struct iss_device *iss)
119 {
120         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
121                 omap4iss_isp_disable_interrupts(iss);
122 
123         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_CLR(5), ~0);
124 }
125 
126 int omap4iss_get_external_info(struct iss_pipeline *pipe,
127                                struct media_link *link)
128 {
129         struct iss_device *iss =
130                 container_of(pipe, struct iss_video, pipe)->iss;
131         struct v4l2_subdev_format fmt;
132         struct v4l2_ctrl *ctrl;
133         int ret;
134 
135         if (!pipe->external)
136                 return 0;
137 
138         if (pipe->external_rate)
139                 return 0;
140 
141         memset(&fmt, 0, sizeof(fmt));
142 
143         fmt.pad = link->source->index;
144         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
145         ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(link->sink->entity),
146                                pad, get_fmt, NULL, &fmt);
147         if (ret < 0)
148                 return -EPIPE;
149 
150         pipe->external_bpp = omap4iss_video_format_info(fmt.format.code)->bpp;
151 
152         ctrl = v4l2_ctrl_find(pipe->external->ctrl_handler,
153                               V4L2_CID_PIXEL_RATE);
154         if (!ctrl) {
155                 dev_warn(iss->dev, "no pixel rate control in subdev %s\n",
156                          pipe->external->name);
157                 return -EPIPE;
158         }
159 
160         pipe->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
161 
162         return 0;
163 }
164 
165 /*
166  * Configure the bridge. Valid inputs are
167  *
168  * IPIPEIF_INPUT_CSI2A: CSI2a receiver
169  * IPIPEIF_INPUT_CSI2B: CSI2b receiver
170  *
171  * The bridge and lane shifter are configured according to the selected input
172  * and the ISP platform data.
173  */
174 void omap4iss_configure_bridge(struct iss_device *iss,
175                                enum ipipeif_input_entity input)
176 {
177         u32 issctrl_val;
178         u32 isp5ctrl_val;
179 
180         issctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL);
181         issctrl_val &= ~ISS_CTRL_INPUT_SEL_MASK;
182         issctrl_val &= ~ISS_CTRL_CLK_DIV_MASK;
183 
184         isp5ctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL);
185 
186         switch (input) {
187         case IPIPEIF_INPUT_CSI2A:
188                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2A;
189                 break;
190 
191         case IPIPEIF_INPUT_CSI2B:
192                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2B;
193                 break;
194 
195         default:
196                 return;
197         }
198 
199         issctrl_val |= ISS_CTRL_SYNC_DETECT_VS_RAISING;
200 
201         isp5ctrl_val |= ISP5_CTRL_VD_PULSE_EXT | ISP5_CTRL_PSYNC_CLK_SEL |
202                         ISP5_CTRL_SYNC_ENABLE;
203 
204         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL, issctrl_val);
205         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, isp5ctrl_val);
206 }
207 
208 #ifdef ISS_ISR_DEBUG
209 static void iss_isr_dbg(struct iss_device *iss, u32 irqstatus)
210 {
211         static const char * const name[] = {
212                 "ISP_0",
213                 "ISP_1",
214                 "ISP_2",
215                 "ISP_3",
216                 "CSIA",
217                 "CSIB",
218                 "CCP2_0",
219                 "CCP2_1",
220                 "CCP2_2",
221                 "CCP2_3",
222                 "CBUFF",
223                 "BTE",
224                 "SIMCOP_0",
225                 "SIMCOP_1",
226                 "SIMCOP_2",
227                 "SIMCOP_3",
228                 "CCP2_8",
229                 "HS_VS",
230                 "18",
231                 "19",
232                 "20",
233                 "21",
234                 "22",
235                 "23",
236                 "24",
237                 "25",
238                 "26",
239                 "27",
240                 "28",
241                 "29",
242                 "30",
243                 "31",
244         };
245         unsigned int i;
246 
247         dev_dbg(iss->dev, "ISS IRQ: ");
248 
249         for (i = 0; i < ARRAY_SIZE(name); i++) {
250                 if ((1 << i) & irqstatus)
251                         pr_cont("%s ", name[i]);
252         }
253         pr_cont("\n");
254 }
255 
256 static void iss_isp_isr_dbg(struct iss_device *iss, u32 irqstatus)
257 {
258         static const char * const name[] = {
259                 "ISIF_0",
260                 "ISIF_1",
261                 "ISIF_2",
262                 "ISIF_3",
263                 "IPIPEREQ",
264                 "IPIPELAST_PIX",
265                 "IPIPEDMA",
266                 "IPIPEBSC",
267                 "IPIPEHST",
268                 "IPIPEIF",
269                 "AEW",
270                 "AF",
271                 "H3A",
272                 "RSZ_REG",
273                 "RSZ_LAST_PIX",
274                 "RSZ_DMA",
275                 "RSZ_CYC_RZA",
276                 "RSZ_CYC_RZB",
277                 "RSZ_FIFO_OVF",
278                 "RSZ_FIFO_IN_BLK_ERR",
279                 "20",
280                 "21",
281                 "RSZ_EOF0",
282                 "RSZ_EOF1",
283                 "H3A_EOF",
284                 "IPIPE_EOF",
285                 "26",
286                 "IPIPE_DPC_INI",
287                 "IPIPE_DPC_RNEW0",
288                 "IPIPE_DPC_RNEW1",
289                 "30",
290                 "OCP_ERR",
291         };
292         unsigned int i;
293 
294         dev_dbg(iss->dev, "ISP IRQ: ");
295 
296         for (i = 0; i < ARRAY_SIZE(name); i++) {
297                 if ((1 << i) & irqstatus)
298                         pr_cont("%s ", name[i]);
299         }
300         pr_cont("\n");
301 }
302 #endif
303 
304 /*
305  * iss_isr - Interrupt Service Routine for ISS module.
306  * @irq: Not used currently.
307  * @_iss: Pointer to the OMAP4 ISS device
308  *
309  * Handles the corresponding callback if plugged in.
310  *
311  * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
312  * IRQ wasn't handled.
313  */
314 static irqreturn_t iss_isr(int irq, void *_iss)
315 {
316         static const u32 ipipeif_events = ISP5_IRQ_IPIPEIF_IRQ |
317                                           ISP5_IRQ_ISIF_INT(0);
318         static const u32 resizer_events = ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
319                                           ISP5_IRQ_RSZ_FIFO_OVF |
320                                           ISP5_IRQ_RSZ_INT_DMA;
321         struct iss_device *iss = _iss;
322         u32 irqstatus;
323 
324         irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5));
325         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), irqstatus);
326 
327         if (irqstatus & ISS_HL_IRQ_CSIA)
328                 omap4iss_csi2_isr(&iss->csi2a);
329 
330         if (irqstatus & ISS_HL_IRQ_CSIB)
331                 omap4iss_csi2_isr(&iss->csi2b);
332 
333         if (irqstatus & ISS_HL_IRQ_ISP(0)) {
334                 u32 isp_irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
335                                                  ISP5_IRQSTATUS(0));
336                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0),
337                               isp_irqstatus);
338 
339                 if (isp_irqstatus & ISP5_IRQ_OCP_ERR)
340                         dev_dbg(iss->dev, "ISP5 OCP Error!\n");
341 
342                 if (isp_irqstatus & ipipeif_events) {
343                         omap4iss_ipipeif_isr(&iss->ipipeif,
344                                              isp_irqstatus & ipipeif_events);
345                 }
346 
347                 if (isp_irqstatus & resizer_events)
348                         omap4iss_resizer_isr(&iss->resizer,
349                                              isp_irqstatus & resizer_events);
350 
351 #ifdef ISS_ISR_DEBUG
352                 iss_isp_isr_dbg(iss, isp_irqstatus);
353 #endif
354         }
355 
356         omap4iss_flush(iss);
357 
358 #ifdef ISS_ISR_DEBUG
359         iss_isr_dbg(iss, irqstatus);
360 #endif
361 
362         return IRQ_HANDLED;
363 }
364 
365 static const struct media_device_ops iss_media_ops = {
366         .link_notify = v4l2_pipeline_link_notify,
367 };
368 
369 /* -----------------------------------------------------------------------------
370  * Pipeline stream management
371  */
372 
373 /*
374  * iss_pipeline_disable - Disable streaming on a pipeline
375  * @pipe: ISS pipeline
376  * @until: entity at which to stop pipeline walk
377  *
378  * Walk the entities chain starting at the pipeline output video node and stop
379  * all modules in the chain. Wait synchronously for the modules to be stopped if
380  * necessary.
381  *
382  * If the until argument isn't NULL, stop the pipeline walk when reaching the
383  * until entity. This is used to disable a partially started pipeline due to a
384  * subdev start error.
385  */
386 static int iss_pipeline_disable(struct iss_pipeline *pipe,
387                                 struct media_entity *until)
388 {
389         struct iss_device *iss = pipe->output->iss;
390         struct media_entity *entity;
391         struct media_pad *pad;
392         struct v4l2_subdev *subdev;
393         int failure = 0;
394         int ret;
395 
396         entity = &pipe->output->video.entity;
397         while (1) {
398                 pad = &entity->pads[0];
399                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
400                         break;
401 
402                 pad = media_entity_remote_pad(pad);
403                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
404                         break;
405 
406                 entity = pad->entity;
407                 if (entity == until)
408                         break;
409 
410                 subdev = media_entity_to_v4l2_subdev(entity);
411                 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
412                 if (ret < 0) {
413                         dev_warn(iss->dev, "%s: module stop timeout.\n",
414                                  subdev->name);
415                         /* If the entity failed to stopped, assume it has
416                          * crashed. Mark it as such, the ISS will be reset when
417                          * applications will release it.
418                          */
419                         media_entity_enum_set(&iss->crashed, &subdev->entity);
420                         failure = -ETIMEDOUT;
421                 }
422         }
423 
424         return failure;
425 }
426 
427 /*
428  * iss_pipeline_enable - Enable streaming on a pipeline
429  * @pipe: ISS pipeline
430  * @mode: Stream mode (single shot or continuous)
431  *
432  * Walk the entities chain starting at the pipeline output video node and start
433  * all modules in the chain in the given mode.
434  *
435  * Return 0 if successful, or the return value of the failed video::s_stream
436  * operation otherwise.
437  */
438 static int iss_pipeline_enable(struct iss_pipeline *pipe,
439                                enum iss_pipeline_stream_state mode)
440 {
441         struct iss_device *iss = pipe->output->iss;
442         struct media_entity *entity;
443         struct media_pad *pad;
444         struct v4l2_subdev *subdev;
445         unsigned long flags;
446         int ret;
447 
448         /* If one of the entities in the pipeline has crashed it will not work
449          * properly. Refuse to start streaming in that case. This check must be
450          * performed before the loop below to avoid starting entities if the
451          * pipeline won't start anyway (those entities would then likely fail to
452          * stop, making the problem worse).
453          */
454         if (media_entity_enum_intersects(&pipe->ent_enum, &iss->crashed))
455                 return -EIO;
456 
457         spin_lock_irqsave(&pipe->lock, flags);
458         pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
459         spin_unlock_irqrestore(&pipe->lock, flags);
460 
461         pipe->do_propagation = false;
462 
463         entity = &pipe->output->video.entity;
464         while (1) {
465                 pad = &entity->pads[0];
466                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
467                         break;
468 
469                 pad = media_entity_remote_pad(pad);
470                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
471                         break;
472 
473                 entity = pad->entity;
474                 subdev = media_entity_to_v4l2_subdev(entity);
475 
476                 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
477                 if (ret < 0 && ret != -ENOIOCTLCMD) {
478                         iss_pipeline_disable(pipe, entity);
479                         return ret;
480                 }
481 
482                 if (subdev == &iss->csi2a.subdev ||
483                     subdev == &iss->csi2b.subdev)
484                         pipe->do_propagation = true;
485         }
486 
487         iss_print_status(pipe->output->iss);
488         return 0;
489 }
490 
491 /*
492  * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
493  * @pipe: ISS pipeline
494  * @state: Stream state (stopped, single shot or continuous)
495  *
496  * Set the pipeline to the given stream state. Pipelines can be started in
497  * single-shot or continuous mode.
498  *
499  * Return 0 if successful, or the return value of the failed video::s_stream
500  * operation otherwise. The pipeline state is not updated when the operation
501  * fails, except when stopping the pipeline.
502  */
503 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
504                                  enum iss_pipeline_stream_state state)
505 {
506         int ret;
507 
508         if (state == ISS_PIPELINE_STREAM_STOPPED)
509                 ret = iss_pipeline_disable(pipe, NULL);
510         else
511                 ret = iss_pipeline_enable(pipe, state);
512 
513         if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
514                 pipe->stream_state = state;
515 
516         return ret;
517 }
518 
519 /*
520  * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
521  * @pipe: ISS pipeline
522  *
523  * Cancelling a stream mark all buffers on all video nodes in the pipeline as
524  * erroneous and makes sure no new buffer can be queued. This function is called
525  * when a fatal error that prevents any further operation on the pipeline
526  * occurs.
527  */
528 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
529 {
530         if (pipe->input)
531                 omap4iss_video_cancel_stream(pipe->input);
532         if (pipe->output)
533                 omap4iss_video_cancel_stream(pipe->output);
534 }
535 
536 /*
537  * iss_pipeline_is_last - Verify if entity has an enabled link to the output
538  *                        video node
539  * @me: ISS module's media entity
540  *
541  * Returns 1 if the entity has an enabled link to the output video node or 0
542  * otherwise. It's true only while pipeline can have no more than one output
543  * node.
544  */
545 static int iss_pipeline_is_last(struct media_entity *me)
546 {
547         struct iss_pipeline *pipe;
548         struct media_pad *pad;
549 
550         if (!me->pipe)
551                 return 0;
552         pipe = to_iss_pipeline(me);
553         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
554                 return 0;
555         pad = media_entity_remote_pad(&pipe->output->pad);
556         return pad->entity == me;
557 }
558 
559 static int iss_reset(struct iss_device *iss)
560 {
561         unsigned int timeout;
562 
563         iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
564                     ISS_HL_SYSCONFIG_SOFTRESET);
565 
566         timeout = iss_poll_condition_timeout(
567                 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
568                 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
569         if (timeout) {
570                 dev_err(iss->dev, "ISS reset timeout\n");
571                 return -ETIMEDOUT;
572         }
573 
574         media_entity_enum_zero(&iss->crashed);
575 
576         return 0;
577 }
578 
579 static int iss_isp_reset(struct iss_device *iss)
580 {
581         unsigned int timeout;
582 
583         /* Fist, ensure that the ISP is IDLE (no transactions happening) */
584         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
585                        ISP5_SYSCONFIG_STANDBYMODE_MASK,
586                        ISP5_SYSCONFIG_STANDBYMODE_SMART);
587 
588         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
589 
590         timeout = iss_poll_condition_timeout(
591                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
592                 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
593         if (timeout) {
594                 dev_err(iss->dev, "ISP5 standby timeout\n");
595                 return -ETIMEDOUT;
596         }
597 
598         /* Now finally, do the reset */
599         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
600                     ISP5_SYSCONFIG_SOFTRESET);
601 
602         timeout = iss_poll_condition_timeout(
603                 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
604                 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
605         if (timeout) {
606                 dev_err(iss->dev, "ISP5 reset timeout\n");
607                 return -ETIMEDOUT;
608         }
609 
610         return 0;
611 }
612 
613 /*
614  * iss_module_sync_idle - Helper to sync module with its idle state
615  * @me: ISS submodule's media entity
616  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
617  * @stopping: flag which tells module wants to stop
618  *
619  * This function checks if ISS submodule needs to wait for next interrupt. If
620  * yes, makes the caller to sleep while waiting for such event.
621  */
622 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
623                               atomic_t *stopping)
624 {
625         struct iss_pipeline *pipe = to_iss_pipeline(me);
626         struct iss_video *video = pipe->output;
627         unsigned long flags;
628 
629         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
630             (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
631              !iss_pipeline_ready(pipe)))
632                 return 0;
633 
634         /*
635          * atomic_set() doesn't include memory barrier on ARM platform for SMP
636          * scenario. We'll call it here to avoid race conditions.
637          */
638         atomic_set(stopping, 1);
639         smp_wmb();
640 
641         /*
642          * If module is the last one, it's writing to memory. In this case,
643          * it's necessary to check if the module is already paused due to
644          * DMA queue underrun or if it has to wait for next interrupt to be
645          * idle.
646          * If it isn't the last one, the function won't sleep but *stopping
647          * will still be set to warn next submodule caller's interrupt the
648          * module wants to be idle.
649          */
650         if (!iss_pipeline_is_last(me))
651                 return 0;
652 
653         spin_lock_irqsave(&video->qlock, flags);
654         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
655                 spin_unlock_irqrestore(&video->qlock, flags);
656                 atomic_set(stopping, 0);
657                 smp_wmb();
658                 return 0;
659         }
660         spin_unlock_irqrestore(&video->qlock, flags);
661         if (!wait_event_timeout(*wait, !atomic_read(stopping),
662                                 msecs_to_jiffies(1000))) {
663                 atomic_set(stopping, 0);
664                 smp_wmb();
665                 return -ETIMEDOUT;
666         }
667 
668         return 0;
669 }
670 
671 /*
672  * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
673  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
674  * @stopping: flag which tells module wants to stop
675  *
676  * This function checks if ISS submodule was stopping. In case of yes, it
677  * notices the caller by setting stopping to 0 and waking up the wait queue.
678  * Returns 1 if it was stopping or 0 otherwise.
679  */
680 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
681                                      atomic_t *stopping)
682 {
683         if (atomic_cmpxchg(stopping, 1, 0)) {
684                 wake_up(wait);
685                 return 1;
686         }
687 
688         return 0;
689 }
690 
691 /* --------------------------------------------------------------------------
692  * Clock management
693  */
694 
695 #define ISS_CLKCTRL_MASK        (ISS_CLKCTRL_CSI2_A |\
696                                  ISS_CLKCTRL_CSI2_B |\
697                                  ISS_CLKCTRL_ISP)
698 
699 static int __iss_subclk_update(struct iss_device *iss)
700 {
701         u32 clk = 0;
702         int ret = 0, timeout = 1000;
703 
704         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
705                 clk |= ISS_CLKCTRL_CSI2_A;
706 
707         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
708                 clk |= ISS_CLKCTRL_CSI2_B;
709 
710         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
711                 clk |= ISS_CLKCTRL_ISP;
712 
713         iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
714                        ISS_CLKCTRL_MASK, clk);
715 
716         /* Wait for HW assertion */
717         while (--timeout > 0) {
718                 udelay(1);
719                 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
720                     ISS_CLKCTRL_MASK) == clk)
721                         break;
722         }
723 
724         if (!timeout)
725                 ret = -EBUSY;
726 
727         return ret;
728 }
729 
730 int omap4iss_subclk_enable(struct iss_device *iss,
731                            enum iss_subclk_resource res)
732 {
733         iss->subclk_resources |= res;
734 
735         return __iss_subclk_update(iss);
736 }
737 
738 int omap4iss_subclk_disable(struct iss_device *iss,
739                             enum iss_subclk_resource res)
740 {
741         iss->subclk_resources &= ~res;
742 
743         return __iss_subclk_update(iss);
744 }
745 
746 #define ISS_ISP5_CLKCTRL_MASK   (ISP5_CTRL_BL_CLK_ENABLE |\
747                                  ISP5_CTRL_ISIF_CLK_ENABLE |\
748                                  ISP5_CTRL_H3A_CLK_ENABLE |\
749                                  ISP5_CTRL_RSZ_CLK_ENABLE |\
750                                  ISP5_CTRL_IPIPE_CLK_ENABLE |\
751                                  ISP5_CTRL_IPIPEIF_CLK_ENABLE)
752 
753 static void __iss_isp_subclk_update(struct iss_device *iss)
754 {
755         u32 clk = 0;
756 
757         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
758                 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
759 
760         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
761                 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
762 
763         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
764                 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
765 
766         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
767                 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
768 
769         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
770                 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
771 
772         if (clk)
773                 clk |= ISP5_CTRL_BL_CLK_ENABLE;
774 
775         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
776                        ISS_ISP5_CLKCTRL_MASK, clk);
777 }
778 
779 void omap4iss_isp_subclk_enable(struct iss_device *iss,
780                                 enum iss_isp_subclk_resource res)
781 {
782         iss->isp_subclk_resources |= res;
783 
784         __iss_isp_subclk_update(iss);
785 }
786 
787 void omap4iss_isp_subclk_disable(struct iss_device *iss,
788                                  enum iss_isp_subclk_resource res)
789 {
790         iss->isp_subclk_resources &= ~res;
791 
792         __iss_isp_subclk_update(iss);
793 }
794 
795 /*
796  * iss_enable_clocks - Enable ISS clocks
797  * @iss: OMAP4 ISS device
798  *
799  * Return 0 if successful, or clk_enable return value if any of tthem fails.
800  */
801 static int iss_enable_clocks(struct iss_device *iss)
802 {
803         int ret;
804 
805         ret = clk_enable(iss->iss_fck);
806         if (ret) {
807                 dev_err(iss->dev, "clk_enable iss_fck failed\n");
808                 return ret;
809         }
810 
811         ret = clk_enable(iss->iss_ctrlclk);
812         if (ret) {
813                 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
814                 clk_disable(iss->iss_fck);
815                 return ret;
816         }
817 
818         return 0;
819 }
820 
821 /*
822  * iss_disable_clocks - Disable ISS clocks
823  * @iss: OMAP4 ISS device
824  */
825 static void iss_disable_clocks(struct iss_device *iss)
826 {
827         clk_disable(iss->iss_ctrlclk);
828         clk_disable(iss->iss_fck);
829 }
830 
831 static int iss_get_clocks(struct iss_device *iss)
832 {
833         iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
834         if (IS_ERR(iss->iss_fck)) {
835                 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
836                 return PTR_ERR(iss->iss_fck);
837         }
838 
839         iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
840         if (IS_ERR(iss->iss_ctrlclk)) {
841                 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
842                 return PTR_ERR(iss->iss_ctrlclk);
843         }
844 
845         return 0;
846 }
847 
848 /*
849  * omap4iss_get - Acquire the ISS resource.
850  *
851  * Initializes the clocks for the first acquire.
852  *
853  * Increment the reference count on the ISS. If the first reference is taken,
854  * enable clocks and power-up all submodules.
855  *
856  * Return a pointer to the ISS device structure, or NULL if an error occurred.
857  */
858 struct iss_device *omap4iss_get(struct iss_device *iss)
859 {
860         struct iss_device *__iss = iss;
861 
862         if (!iss)
863                 return NULL;
864 
865         mutex_lock(&iss->iss_mutex);
866         if (iss->ref_count > 0)
867                 goto out;
868 
869         if (iss_enable_clocks(iss) < 0) {
870                 __iss = NULL;
871                 goto out;
872         }
873 
874         iss_enable_interrupts(iss);
875 
876 out:
877         if (__iss)
878                 iss->ref_count++;
879         mutex_unlock(&iss->iss_mutex);
880 
881         return __iss;
882 }
883 
884 /*
885  * omap4iss_put - Release the ISS
886  *
887  * Decrement the reference count on the ISS. If the last reference is released,
888  * power-down all submodules, disable clocks and free temporary buffers.
889  */
890 void omap4iss_put(struct iss_device *iss)
891 {
892         if (!iss)
893                 return;
894 
895         mutex_lock(&iss->iss_mutex);
896         BUG_ON(iss->ref_count == 0);
897         if (--iss->ref_count == 0) {
898                 iss_disable_interrupts(iss);
899                 /* Reset the ISS if an entity has failed to stop. This is the
900                  * only way to recover from such conditions, although it would
901                  * be worth investigating whether resetting the ISP only can't
902                  * fix the problem in some cases.
903                  */
904                 if (!media_entity_enum_empty(&iss->crashed))
905                         iss_reset(iss);
906                 iss_disable_clocks(iss);
907         }
908         mutex_unlock(&iss->iss_mutex);
909 }
910 
911 static int iss_map_mem_resource(struct platform_device *pdev,
912                                 struct iss_device *iss,
913                                 enum iss_mem_resources res)
914 {
915         struct resource *mem;
916 
917         mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
918 
919         iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
920 
921         return PTR_ERR_OR_ZERO(iss->regs[res]);
922 }
923 
924 static void iss_unregister_entities(struct iss_device *iss)
925 {
926         omap4iss_resizer_unregister_entities(&iss->resizer);
927         omap4iss_ipipe_unregister_entities(&iss->ipipe);
928         omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
929         omap4iss_csi2_unregister_entities(&iss->csi2a);
930         omap4iss_csi2_unregister_entities(&iss->csi2b);
931 
932         v4l2_device_unregister(&iss->v4l2_dev);
933         media_device_unregister(&iss->media_dev);
934 }
935 
936 /*
937  * iss_register_subdev_group - Register a group of subdevices
938  * @iss: OMAP4 ISS device
939  * @board_info: I2C subdevs board information array
940  *
941  * Register all I2C subdevices in the board_info array. The array must be
942  * terminated by a NULL entry, and the first entry must be the sensor.
943  *
944  * Return a pointer to the sensor media entity if it has been successfully
945  * registered, or NULL otherwise.
946  */
947 static struct v4l2_subdev *
948 iss_register_subdev_group(struct iss_device *iss,
949                           struct iss_subdev_i2c_board_info *board_info)
950 {
951         struct v4l2_subdev *sensor = NULL;
952         unsigned int first;
953 
954         if (!board_info->board_info)
955                 return NULL;
956 
957         for (first = 1; board_info->board_info; ++board_info, first = 0) {
958                 struct v4l2_subdev *subdev;
959                 struct i2c_adapter *adapter;
960 
961                 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
962                 if (!adapter) {
963                         dev_err(iss->dev,
964                                 "%s: Unable to get I2C adapter %d for device %s\n",
965                                 __func__, board_info->i2c_adapter_id,
966                                 board_info->board_info->type);
967                         continue;
968                 }
969 
970                 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
971                                 board_info->board_info, NULL);
972                 if (!subdev) {
973                         dev_err(iss->dev, "Unable to register subdev %s\n",
974                                 board_info->board_info->type);
975                         continue;
976                 }
977 
978                 if (first)
979                         sensor = subdev;
980         }
981 
982         return sensor;
983 }
984 
985 static int iss_register_entities(struct iss_device *iss)
986 {
987         struct iss_platform_data *pdata = iss->pdata;
988         struct iss_v4l2_subdevs_group *subdevs;
989         int ret;
990 
991         iss->media_dev.dev = iss->dev;
992         strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
993                 sizeof(iss->media_dev.model));
994         iss->media_dev.hw_revision = iss->revision;
995         iss->media_dev.ops = &iss_media_ops;
996         ret = media_device_register(&iss->media_dev);
997         if (ret < 0) {
998                 dev_err(iss->dev, "Media device registration failed (%d)\n",
999                         ret);
1000                 return ret;
1001         }
1002 
1003         iss->v4l2_dev.mdev = &iss->media_dev;
1004         ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1005         if (ret < 0) {
1006                 dev_err(iss->dev, "V4L2 device registration failed (%d)\n",
1007                         ret);
1008                 goto done;
1009         }
1010 
1011         /* Register internal entities */
1012         ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1013         if (ret < 0)
1014                 goto done;
1015 
1016         ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1017         if (ret < 0)
1018                 goto done;
1019 
1020         ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1021         if (ret < 0)
1022                 goto done;
1023 
1024         ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1025         if (ret < 0)
1026                 goto done;
1027 
1028         ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1029         if (ret < 0)
1030                 goto done;
1031 
1032         /* Register external entities */
1033         for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1034                 struct v4l2_subdev *sensor;
1035                 struct media_entity *input;
1036                 unsigned int flags;
1037                 unsigned int pad;
1038 
1039                 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1040                 if (!sensor)
1041                         continue;
1042 
1043                 sensor->host_priv = subdevs;
1044 
1045                 /* Connect the sensor to the correct interface module.
1046                  * CSI2a receiver through CSIPHY1, or
1047                  * CSI2b receiver through CSIPHY2
1048                  */
1049                 switch (subdevs->interface) {
1050                 case ISS_INTERFACE_CSI2A_PHY1:
1051                         input = &iss->csi2a.subdev.entity;
1052                         pad = CSI2_PAD_SINK;
1053                         flags = MEDIA_LNK_FL_IMMUTABLE
1054                               | MEDIA_LNK_FL_ENABLED;
1055                         break;
1056 
1057                 case ISS_INTERFACE_CSI2B_PHY2:
1058                         input = &iss->csi2b.subdev.entity;
1059                         pad = CSI2_PAD_SINK;
1060                         flags = MEDIA_LNK_FL_IMMUTABLE
1061                               | MEDIA_LNK_FL_ENABLED;
1062                         break;
1063 
1064                 default:
1065                         dev_err(iss->dev, "invalid interface type %u\n",
1066                                 subdevs->interface);
1067                         ret = -EINVAL;
1068                         goto done;
1069                 }
1070 
1071                 ret = media_create_pad_link(&sensor->entity, 0, input, pad,
1072                                             flags);
1073                 if (ret < 0)
1074                         goto done;
1075         }
1076 
1077         ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1078 
1079 done:
1080         if (ret < 0)
1081                 iss_unregister_entities(iss);
1082 
1083         return ret;
1084 }
1085 
1086 /*
1087  * iss_create_links() - Pads links creation for the subdevices
1088  * @iss : Pointer to ISS device
1089  *
1090  * return negative error code or zero on success
1091  */
1092 static int iss_create_links(struct iss_device *iss)
1093 {
1094         int ret;
1095 
1096         ret = omap4iss_csi2_create_links(iss);
1097         if (ret < 0) {
1098                 dev_err(iss->dev, "CSI2 pads links creation failed\n");
1099                 return ret;
1100         }
1101 
1102         ret = omap4iss_ipipeif_create_links(iss);
1103         if (ret < 0) {
1104                 dev_err(iss->dev, "ISP IPIPEIF pads links creation failed\n");
1105                 return ret;
1106         }
1107 
1108         ret = omap4iss_resizer_create_links(iss);
1109         if (ret < 0) {
1110                 dev_err(iss->dev, "ISP RESIZER pads links creation failed\n");
1111                 return ret;
1112         }
1113 
1114         /* Connect the submodules. */
1115         ret = media_create_pad_link(
1116                         &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1117                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1118         if (ret < 0)
1119                 return ret;
1120 
1121         ret = media_create_pad_link(
1122                         &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1123                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1124         if (ret < 0)
1125                 return ret;
1126 
1127         ret = media_create_pad_link(
1128                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1129                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1130         if (ret < 0)
1131                 return ret;
1132 
1133         ret = media_create_pad_link(
1134                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1135                         &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1136         if (ret < 0)
1137                 return ret;
1138 
1139         ret = media_create_pad_link(
1140                         &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1141                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1142         if (ret < 0)
1143                 return ret;
1144 
1145         return 0;
1146 };
1147 
1148 static void iss_cleanup_modules(struct iss_device *iss)
1149 {
1150         omap4iss_csi2_cleanup(iss);
1151         omap4iss_ipipeif_cleanup(iss);
1152         omap4iss_ipipe_cleanup(iss);
1153         omap4iss_resizer_cleanup(iss);
1154 }
1155 
1156 static int iss_initialize_modules(struct iss_device *iss)
1157 {
1158         int ret;
1159 
1160         ret = omap4iss_csiphy_init(iss);
1161         if (ret < 0) {
1162                 dev_err(iss->dev, "CSI PHY initialization failed\n");
1163                 goto error_csiphy;
1164         }
1165 
1166         ret = omap4iss_csi2_init(iss);
1167         if (ret < 0) {
1168                 dev_err(iss->dev, "CSI2 initialization failed\n");
1169                 goto error_csi2;
1170         }
1171 
1172         ret = omap4iss_ipipeif_init(iss);
1173         if (ret < 0) {
1174                 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1175                 goto error_ipipeif;
1176         }
1177 
1178         ret = omap4iss_ipipe_init(iss);
1179         if (ret < 0) {
1180                 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1181                 goto error_ipipe;
1182         }
1183 
1184         ret = omap4iss_resizer_init(iss);
1185         if (ret < 0) {
1186                 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1187                 goto error_resizer;
1188         }
1189 
1190         return 0;
1191 
1192 error_resizer:
1193         omap4iss_ipipe_cleanup(iss);
1194 error_ipipe:
1195         omap4iss_ipipeif_cleanup(iss);
1196 error_ipipeif:
1197         omap4iss_csi2_cleanup(iss);
1198 error_csi2:
1199 error_csiphy:
1200         return ret;
1201 }
1202 
1203 static int iss_probe(struct platform_device *pdev)
1204 {
1205         struct iss_platform_data *pdata = pdev->dev.platform_data;
1206         struct iss_device *iss;
1207         unsigned int i;
1208         int ret;
1209 
1210         if (!pdata)
1211                 return -EINVAL;
1212 
1213         iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1214         if (!iss)
1215                 return -ENOMEM;
1216 
1217         mutex_init(&iss->iss_mutex);
1218 
1219         iss->dev = &pdev->dev;
1220         iss->pdata = pdata;
1221 
1222         iss->raw_dmamask = DMA_BIT_MASK(32);
1223         iss->dev->dma_mask = &iss->raw_dmamask;
1224         iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1225 
1226         platform_set_drvdata(pdev, iss);
1227 
1228         /*
1229          * TODO: When implementing DT support switch to syscon regmap lookup by
1230          * phandle.
1231          */
1232         iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
1233         if (IS_ERR(iss->syscon)) {
1234                 ret = PTR_ERR(iss->syscon);
1235                 goto error;
1236         }
1237 
1238         /* Clocks */
1239         ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1240         if (ret < 0)
1241                 goto error;
1242 
1243         ret = iss_get_clocks(iss);
1244         if (ret < 0)
1245                 goto error;
1246 
1247         if (!omap4iss_get(iss))
1248                 goto error;
1249 
1250         ret = iss_reset(iss);
1251         if (ret < 0)
1252                 goto error_iss;
1253 
1254         iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1255         dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1256 
1257         for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1258                 ret = iss_map_mem_resource(pdev, iss, i);
1259                 if (ret)
1260                         goto error_iss;
1261         }
1262 
1263         /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1264         iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1265                        BTE_CTRL_BW_LIMITER_MASK,
1266                        18 << BTE_CTRL_BW_LIMITER_SHIFT);
1267 
1268         /* Perform ISP reset */
1269         ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1270         if (ret < 0)
1271                 goto error_iss;
1272 
1273         ret = iss_isp_reset(iss);
1274         if (ret < 0)
1275                 goto error_iss;
1276 
1277         dev_info(iss->dev, "ISP Revision %08x found\n",
1278                  iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1279 
1280         /* Interrupt */
1281         ret = platform_get_irq(pdev, 0);
1282         if (ret <= 0) {
1283                 dev_err(iss->dev, "No IRQ resource\n");
1284                 ret = -ENODEV;
1285                 goto error_iss;
1286         }
1287         iss->irq_num = ret;
1288 
1289         if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1290                              "OMAP4 ISS", iss)) {
1291                 dev_err(iss->dev, "Unable to request IRQ\n");
1292                 ret = -EINVAL;
1293                 goto error_iss;
1294         }
1295 
1296         /* Entities */
1297         ret = iss_initialize_modules(iss);
1298         if (ret < 0)
1299                 goto error_iss;
1300 
1301         ret = iss_register_entities(iss);
1302         if (ret < 0)
1303                 goto error_modules;
1304 
1305         ret = media_entity_enum_init(&iss->crashed, &iss->media_dev);
1306         if (ret)
1307                 goto error_entities;
1308 
1309         ret = iss_create_links(iss);
1310         if (ret < 0)
1311                 goto error_entities;
1312 
1313         omap4iss_put(iss);
1314 
1315         return 0;
1316 
1317 error_entities:
1318         iss_unregister_entities(iss);
1319         media_entity_enum_cleanup(&iss->crashed);
1320 error_modules:
1321         iss_cleanup_modules(iss);
1322 error_iss:
1323         omap4iss_put(iss);
1324 error:
1325         mutex_destroy(&iss->iss_mutex);
1326 
1327         return ret;
1328 }
1329 
1330 static int iss_remove(struct platform_device *pdev)
1331 {
1332         struct iss_device *iss = platform_get_drvdata(pdev);
1333 
1334         iss_unregister_entities(iss);
1335         media_entity_enum_cleanup(&iss->crashed);
1336         iss_cleanup_modules(iss);
1337 
1338         return 0;
1339 }
1340 
1341 static const struct platform_device_id omap4iss_id_table[] = {
1342         { "omap4iss", 0 },
1343         { },
1344 };
1345 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1346 
1347 static struct platform_driver iss_driver = {
1348         .probe          = iss_probe,
1349         .remove         = iss_remove,
1350         .id_table       = omap4iss_id_table,
1351         .driver = {
1352                 .name   = "omap4iss",
1353         },
1354 };
1355 
1356 module_platform_driver(iss_driver);
1357 
1358 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1359 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1360 MODULE_LICENSE("GPL");
1361 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);
1362 

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