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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 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 /* -----------------------------------------------------------------------------
366  * Pipeline stream management
367  */
368 
369 /*
370  * iss_pipeline_disable - Disable streaming on a pipeline
371  * @pipe: ISS pipeline
372  * @until: entity at which to stop pipeline walk
373  *
374  * Walk the entities chain starting at the pipeline output video node and stop
375  * all modules in the chain. Wait synchronously for the modules to be stopped if
376  * necessary.
377  *
378  * If the until argument isn't NULL, stop the pipeline walk when reaching the
379  * until entity. This is used to disable a partially started pipeline due to a
380  * subdev start error.
381  */
382 static int iss_pipeline_disable(struct iss_pipeline *pipe,
383                                 struct media_entity *until)
384 {
385         struct iss_device *iss = pipe->output->iss;
386         struct media_entity *entity;
387         struct media_pad *pad;
388         struct v4l2_subdev *subdev;
389         int failure = 0;
390         int ret;
391 
392         entity = &pipe->output->video.entity;
393         while (1) {
394                 pad = &entity->pads[0];
395                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
396                         break;
397 
398                 pad = media_entity_remote_pad(pad);
399                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
400                         break;
401 
402                 entity = pad->entity;
403                 if (entity == until)
404                         break;
405 
406                 subdev = media_entity_to_v4l2_subdev(entity);
407                 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
408                 if (ret < 0) {
409                         dev_warn(iss->dev, "%s: module stop timeout.\n",
410                                  subdev->name);
411                         /* If the entity failed to stopped, assume it has
412                          * crashed. Mark it as such, the ISS will be reset when
413                          * applications will release it.
414                          */
415                         media_entity_enum_set(&iss->crashed, &subdev->entity);
416                         failure = -ETIMEDOUT;
417                 }
418         }
419 
420         return failure;
421 }
422 
423 /*
424  * iss_pipeline_enable - Enable streaming on a pipeline
425  * @pipe: ISS pipeline
426  * @mode: Stream mode (single shot or continuous)
427  *
428  * Walk the entities chain starting at the pipeline output video node and start
429  * all modules in the chain in the given mode.
430  *
431  * Return 0 if successful, or the return value of the failed video::s_stream
432  * operation otherwise.
433  */
434 static int iss_pipeline_enable(struct iss_pipeline *pipe,
435                                enum iss_pipeline_stream_state mode)
436 {
437         struct iss_device *iss = pipe->output->iss;
438         struct media_entity *entity;
439         struct media_pad *pad;
440         struct v4l2_subdev *subdev;
441         unsigned long flags;
442         int ret;
443 
444         /* If one of the entities in the pipeline has crashed it will not work
445          * properly. Refuse to start streaming in that case. This check must be
446          * performed before the loop below to avoid starting entities if the
447          * pipeline won't start anyway (those entities would then likely fail to
448          * stop, making the problem worse).
449          */
450         if (media_entity_enum_intersects(&pipe->ent_enum, &iss->crashed))
451                 return -EIO;
452 
453         spin_lock_irqsave(&pipe->lock, flags);
454         pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
455         spin_unlock_irqrestore(&pipe->lock, flags);
456 
457         pipe->do_propagation = false;
458 
459         entity = &pipe->output->video.entity;
460         while (1) {
461                 pad = &entity->pads[0];
462                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
463                         break;
464 
465                 pad = media_entity_remote_pad(pad);
466                 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
467                         break;
468 
469                 entity = pad->entity;
470                 subdev = media_entity_to_v4l2_subdev(entity);
471 
472                 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
473                 if (ret < 0 && ret != -ENOIOCTLCMD) {
474                         iss_pipeline_disable(pipe, entity);
475                         return ret;
476                 }
477 
478                 if (subdev == &iss->csi2a.subdev ||
479                     subdev == &iss->csi2b.subdev)
480                         pipe->do_propagation = true;
481         }
482 
483         iss_print_status(pipe->output->iss);
484         return 0;
485 }
486 
487 /*
488  * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
489  * @pipe: ISS pipeline
490  * @state: Stream state (stopped, single shot or continuous)
491  *
492  * Set the pipeline to the given stream state. Pipelines can be started in
493  * single-shot or continuous mode.
494  *
495  * Return 0 if successful, or the return value of the failed video::s_stream
496  * operation otherwise. The pipeline state is not updated when the operation
497  * fails, except when stopping the pipeline.
498  */
499 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
500                                  enum iss_pipeline_stream_state state)
501 {
502         int ret;
503 
504         if (state == ISS_PIPELINE_STREAM_STOPPED)
505                 ret = iss_pipeline_disable(pipe, NULL);
506         else
507                 ret = iss_pipeline_enable(pipe, state);
508 
509         if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
510                 pipe->stream_state = state;
511 
512         return ret;
513 }
514 
515 /*
516  * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
517  * @pipe: ISS pipeline
518  *
519  * Cancelling a stream mark all buffers on all video nodes in the pipeline as
520  * erroneous and makes sure no new buffer can be queued. This function is called
521  * when a fatal error that prevents any further operation on the pipeline
522  * occurs.
523  */
524 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
525 {
526         if (pipe->input)
527                 omap4iss_video_cancel_stream(pipe->input);
528         if (pipe->output)
529                 omap4iss_video_cancel_stream(pipe->output);
530 }
531 
532 /*
533  * iss_pipeline_is_last - Verify if entity has an enabled link to the output
534  *                        video node
535  * @me: ISS module's media entity
536  *
537  * Returns 1 if the entity has an enabled link to the output video node or 0
538  * otherwise. It's true only while pipeline can have no more than one output
539  * node.
540  */
541 static int iss_pipeline_is_last(struct media_entity *me)
542 {
543         struct iss_pipeline *pipe;
544         struct media_pad *pad;
545 
546         if (!me->pipe)
547                 return 0;
548         pipe = to_iss_pipeline(me);
549         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
550                 return 0;
551         pad = media_entity_remote_pad(&pipe->output->pad);
552         return pad->entity == me;
553 }
554 
555 static int iss_reset(struct iss_device *iss)
556 {
557         unsigned int timeout;
558 
559         iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
560                     ISS_HL_SYSCONFIG_SOFTRESET);
561 
562         timeout = iss_poll_condition_timeout(
563                 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
564                 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
565         if (timeout) {
566                 dev_err(iss->dev, "ISS reset timeout\n");
567                 return -ETIMEDOUT;
568         }
569 
570         media_entity_enum_zero(&iss->crashed);
571 
572         return 0;
573 }
574 
575 static int iss_isp_reset(struct iss_device *iss)
576 {
577         unsigned int timeout;
578 
579         /* Fist, ensure that the ISP is IDLE (no transactions happening) */
580         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
581                        ISP5_SYSCONFIG_STANDBYMODE_MASK,
582                        ISP5_SYSCONFIG_STANDBYMODE_SMART);
583 
584         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
585 
586         timeout = iss_poll_condition_timeout(
587                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
588                 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
589         if (timeout) {
590                 dev_err(iss->dev, "ISP5 standby timeout\n");
591                 return -ETIMEDOUT;
592         }
593 
594         /* Now finally, do the reset */
595         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
596                     ISP5_SYSCONFIG_SOFTRESET);
597 
598         timeout = iss_poll_condition_timeout(
599                 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
600                 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
601         if (timeout) {
602                 dev_err(iss->dev, "ISP5 reset timeout\n");
603                 return -ETIMEDOUT;
604         }
605 
606         return 0;
607 }
608 
609 /*
610  * iss_module_sync_idle - Helper to sync module with its idle state
611  * @me: ISS submodule's media entity
612  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
613  * @stopping: flag which tells module wants to stop
614  *
615  * This function checks if ISS submodule needs to wait for next interrupt. If
616  * yes, makes the caller to sleep while waiting for such event.
617  */
618 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
619                               atomic_t *stopping)
620 {
621         struct iss_pipeline *pipe = to_iss_pipeline(me);
622         struct iss_video *video = pipe->output;
623         unsigned long flags;
624 
625         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
626             (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
627              !iss_pipeline_ready(pipe)))
628                 return 0;
629 
630         /*
631          * atomic_set() doesn't include memory barrier on ARM platform for SMP
632          * scenario. We'll call it here to avoid race conditions.
633          */
634         atomic_set(stopping, 1);
635         smp_wmb();
636 
637         /*
638          * If module is the last one, it's writing to memory. In this case,
639          * it's necessary to check if the module is already paused due to
640          * DMA queue underrun or if it has to wait for next interrupt to be
641          * idle.
642          * If it isn't the last one, the function won't sleep but *stopping
643          * will still be set to warn next submodule caller's interrupt the
644          * module wants to be idle.
645          */
646         if (!iss_pipeline_is_last(me))
647                 return 0;
648 
649         spin_lock_irqsave(&video->qlock, flags);
650         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
651                 spin_unlock_irqrestore(&video->qlock, flags);
652                 atomic_set(stopping, 0);
653                 smp_wmb();
654                 return 0;
655         }
656         spin_unlock_irqrestore(&video->qlock, flags);
657         if (!wait_event_timeout(*wait, !atomic_read(stopping),
658                                 msecs_to_jiffies(1000))) {
659                 atomic_set(stopping, 0);
660                 smp_wmb();
661                 return -ETIMEDOUT;
662         }
663 
664         return 0;
665 }
666 
667 /*
668  * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
669  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
670  * @stopping: flag which tells module wants to stop
671  *
672  * This function checks if ISS submodule was stopping. In case of yes, it
673  * notices the caller by setting stopping to 0 and waking up the wait queue.
674  * Returns 1 if it was stopping or 0 otherwise.
675  */
676 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
677                                      atomic_t *stopping)
678 {
679         if (atomic_cmpxchg(stopping, 1, 0)) {
680                 wake_up(wait);
681                 return 1;
682         }
683 
684         return 0;
685 }
686 
687 /* --------------------------------------------------------------------------
688  * Clock management
689  */
690 
691 #define ISS_CLKCTRL_MASK        (ISS_CLKCTRL_CSI2_A |\
692                                  ISS_CLKCTRL_CSI2_B |\
693                                  ISS_CLKCTRL_ISP)
694 
695 static int __iss_subclk_update(struct iss_device *iss)
696 {
697         u32 clk = 0;
698         int ret = 0, timeout = 1000;
699 
700         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
701                 clk |= ISS_CLKCTRL_CSI2_A;
702 
703         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
704                 clk |= ISS_CLKCTRL_CSI2_B;
705 
706         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
707                 clk |= ISS_CLKCTRL_ISP;
708 
709         iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
710                        ISS_CLKCTRL_MASK, clk);
711 
712         /* Wait for HW assertion */
713         while (--timeout > 0) {
714                 udelay(1);
715                 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
716                     ISS_CLKCTRL_MASK) == clk)
717                         break;
718         }
719 
720         if (!timeout)
721                 ret = -EBUSY;
722 
723         return ret;
724 }
725 
726 int omap4iss_subclk_enable(struct iss_device *iss,
727                            enum iss_subclk_resource res)
728 {
729         iss->subclk_resources |= res;
730 
731         return __iss_subclk_update(iss);
732 }
733 
734 int omap4iss_subclk_disable(struct iss_device *iss,
735                             enum iss_subclk_resource res)
736 {
737         iss->subclk_resources &= ~res;
738 
739         return __iss_subclk_update(iss);
740 }
741 
742 #define ISS_ISP5_CLKCTRL_MASK   (ISP5_CTRL_BL_CLK_ENABLE |\
743                                  ISP5_CTRL_ISIF_CLK_ENABLE |\
744                                  ISP5_CTRL_H3A_CLK_ENABLE |\
745                                  ISP5_CTRL_RSZ_CLK_ENABLE |\
746                                  ISP5_CTRL_IPIPE_CLK_ENABLE |\
747                                  ISP5_CTRL_IPIPEIF_CLK_ENABLE)
748 
749 static void __iss_isp_subclk_update(struct iss_device *iss)
750 {
751         u32 clk = 0;
752 
753         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
754                 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
755 
756         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
757                 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
758 
759         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
760                 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
761 
762         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
763                 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
764 
765         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
766                 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
767 
768         if (clk)
769                 clk |= ISP5_CTRL_BL_CLK_ENABLE;
770 
771         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
772                        ISS_ISP5_CLKCTRL_MASK, clk);
773 }
774 
775 void omap4iss_isp_subclk_enable(struct iss_device *iss,
776                                 enum iss_isp_subclk_resource res)
777 {
778         iss->isp_subclk_resources |= res;
779 
780         __iss_isp_subclk_update(iss);
781 }
782 
783 void omap4iss_isp_subclk_disable(struct iss_device *iss,
784                                  enum iss_isp_subclk_resource res)
785 {
786         iss->isp_subclk_resources &= ~res;
787 
788         __iss_isp_subclk_update(iss);
789 }
790 
791 /*
792  * iss_enable_clocks - Enable ISS clocks
793  * @iss: OMAP4 ISS device
794  *
795  * Return 0 if successful, or clk_enable return value if any of tthem fails.
796  */
797 static int iss_enable_clocks(struct iss_device *iss)
798 {
799         int ret;
800 
801         ret = clk_enable(iss->iss_fck);
802         if (ret) {
803                 dev_err(iss->dev, "clk_enable iss_fck failed\n");
804                 return ret;
805         }
806 
807         ret = clk_enable(iss->iss_ctrlclk);
808         if (ret) {
809                 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
810                 clk_disable(iss->iss_fck);
811                 return ret;
812         }
813 
814         return 0;
815 }
816 
817 /*
818  * iss_disable_clocks - Disable ISS clocks
819  * @iss: OMAP4 ISS device
820  */
821 static void iss_disable_clocks(struct iss_device *iss)
822 {
823         clk_disable(iss->iss_ctrlclk);
824         clk_disable(iss->iss_fck);
825 }
826 
827 static int iss_get_clocks(struct iss_device *iss)
828 {
829         iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
830         if (IS_ERR(iss->iss_fck)) {
831                 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
832                 return PTR_ERR(iss->iss_fck);
833         }
834 
835         iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
836         if (IS_ERR(iss->iss_ctrlclk)) {
837                 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
838                 return PTR_ERR(iss->iss_ctrlclk);
839         }
840 
841         return 0;
842 }
843 
844 /*
845  * omap4iss_get - Acquire the ISS resource.
846  *
847  * Initializes the clocks for the first acquire.
848  *
849  * Increment the reference count on the ISS. If the first reference is taken,
850  * enable clocks and power-up all submodules.
851  *
852  * Return a pointer to the ISS device structure, or NULL if an error occurred.
853  */
854 struct iss_device *omap4iss_get(struct iss_device *iss)
855 {
856         struct iss_device *__iss = iss;
857 
858         if (!iss)
859                 return NULL;
860 
861         mutex_lock(&iss->iss_mutex);
862         if (iss->ref_count > 0)
863                 goto out;
864 
865         if (iss_enable_clocks(iss) < 0) {
866                 __iss = NULL;
867                 goto out;
868         }
869 
870         iss_enable_interrupts(iss);
871 
872 out:
873         if (__iss)
874                 iss->ref_count++;
875         mutex_unlock(&iss->iss_mutex);
876 
877         return __iss;
878 }
879 
880 /*
881  * omap4iss_put - Release the ISS
882  *
883  * Decrement the reference count on the ISS. If the last reference is released,
884  * power-down all submodules, disable clocks and free temporary buffers.
885  */
886 void omap4iss_put(struct iss_device *iss)
887 {
888         if (!iss)
889                 return;
890 
891         mutex_lock(&iss->iss_mutex);
892         BUG_ON(iss->ref_count == 0);
893         if (--iss->ref_count == 0) {
894                 iss_disable_interrupts(iss);
895                 /* Reset the ISS if an entity has failed to stop. This is the
896                  * only way to recover from such conditions, although it would
897                  * be worth investigating whether resetting the ISP only can't
898                  * fix the problem in some cases.
899                  */
900                 if (!media_entity_enum_empty(&iss->crashed))
901                         iss_reset(iss);
902                 iss_disable_clocks(iss);
903         }
904         mutex_unlock(&iss->iss_mutex);
905 }
906 
907 static int iss_map_mem_resource(struct platform_device *pdev,
908                                 struct iss_device *iss,
909                                 enum iss_mem_resources res)
910 {
911         struct resource *mem;
912 
913         mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
914 
915         iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
916 
917         return PTR_ERR_OR_ZERO(iss->regs[res]);
918 }
919 
920 static void iss_unregister_entities(struct iss_device *iss)
921 {
922         omap4iss_resizer_unregister_entities(&iss->resizer);
923         omap4iss_ipipe_unregister_entities(&iss->ipipe);
924         omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
925         omap4iss_csi2_unregister_entities(&iss->csi2a);
926         omap4iss_csi2_unregister_entities(&iss->csi2b);
927 
928         v4l2_device_unregister(&iss->v4l2_dev);
929         media_device_unregister(&iss->media_dev);
930 }
931 
932 /*
933  * iss_register_subdev_group - Register a group of subdevices
934  * @iss: OMAP4 ISS device
935  * @board_info: I2C subdevs board information array
936  *
937  * Register all I2C subdevices in the board_info array. The array must be
938  * terminated by a NULL entry, and the first entry must be the sensor.
939  *
940  * Return a pointer to the sensor media entity if it has been successfully
941  * registered, or NULL otherwise.
942  */
943 static struct v4l2_subdev *
944 iss_register_subdev_group(struct iss_device *iss,
945                           struct iss_subdev_i2c_board_info *board_info)
946 {
947         struct v4l2_subdev *sensor = NULL;
948         unsigned int first;
949 
950         if (!board_info->board_info)
951                 return NULL;
952 
953         for (first = 1; board_info->board_info; ++board_info, first = 0) {
954                 struct v4l2_subdev *subdev;
955                 struct i2c_adapter *adapter;
956 
957                 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
958                 if (!adapter) {
959                         dev_err(iss->dev,
960                                 "%s: Unable to get I2C adapter %d for device %s\n",
961                                 __func__, board_info->i2c_adapter_id,
962                                 board_info->board_info->type);
963                         continue;
964                 }
965 
966                 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
967                                 board_info->board_info, NULL);
968                 if (!subdev) {
969                         dev_err(iss->dev, "Unable to register subdev %s\n",
970                                 board_info->board_info->type);
971                         continue;
972                 }
973 
974                 if (first)
975                         sensor = subdev;
976         }
977 
978         return sensor;
979 }
980 
981 static int iss_register_entities(struct iss_device *iss)
982 {
983         struct iss_platform_data *pdata = iss->pdata;
984         struct iss_v4l2_subdevs_group *subdevs;
985         int ret;
986 
987         iss->media_dev.dev = iss->dev;
988         strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
989                 sizeof(iss->media_dev.model));
990         iss->media_dev.hw_revision = iss->revision;
991         iss->media_dev.link_notify = v4l2_pipeline_link_notify;
992         ret = media_device_register(&iss->media_dev);
993         if (ret < 0) {
994                 dev_err(iss->dev, "Media device registration failed (%d)\n",
995                         ret);
996                 return ret;
997         }
998 
999         iss->v4l2_dev.mdev = &iss->media_dev;
1000         ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1001         if (ret < 0) {
1002                 dev_err(iss->dev, "V4L2 device registration failed (%d)\n",
1003                         ret);
1004                 goto done;
1005         }
1006 
1007         /* Register internal entities */
1008         ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1009         if (ret < 0)
1010                 goto done;
1011 
1012         ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1013         if (ret < 0)
1014                 goto done;
1015 
1016         ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1017         if (ret < 0)
1018                 goto done;
1019 
1020         ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1021         if (ret < 0)
1022                 goto done;
1023 
1024         ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1025         if (ret < 0)
1026                 goto done;
1027 
1028         /* Register external entities */
1029         for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1030                 struct v4l2_subdev *sensor;
1031                 struct media_entity *input;
1032                 unsigned int flags;
1033                 unsigned int pad;
1034 
1035                 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1036                 if (!sensor)
1037                         continue;
1038 
1039                 sensor->host_priv = subdevs;
1040 
1041                 /* Connect the sensor to the correct interface module.
1042                  * CSI2a receiver through CSIPHY1, or
1043                  * CSI2b receiver through CSIPHY2
1044                  */
1045                 switch (subdevs->interface) {
1046                 case ISS_INTERFACE_CSI2A_PHY1:
1047                         input = &iss->csi2a.subdev.entity;
1048                         pad = CSI2_PAD_SINK;
1049                         flags = MEDIA_LNK_FL_IMMUTABLE
1050                               | MEDIA_LNK_FL_ENABLED;
1051                         break;
1052 
1053                 case ISS_INTERFACE_CSI2B_PHY2:
1054                         input = &iss->csi2b.subdev.entity;
1055                         pad = CSI2_PAD_SINK;
1056                         flags = MEDIA_LNK_FL_IMMUTABLE
1057                               | MEDIA_LNK_FL_ENABLED;
1058                         break;
1059 
1060                 default:
1061                         dev_err(iss->dev, "invalid interface type %u\n",
1062                                 subdevs->interface);
1063                         ret = -EINVAL;
1064                         goto done;
1065                 }
1066 
1067                 ret = media_create_pad_link(&sensor->entity, 0, input, pad,
1068                                             flags);
1069                 if (ret < 0)
1070                         goto done;
1071         }
1072 
1073         ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1074 
1075 done:
1076         if (ret < 0)
1077                 iss_unregister_entities(iss);
1078 
1079         return ret;
1080 }
1081 
1082 /*
1083  * iss_create_links() - Pads links creation for the subdevices
1084  * @iss : Pointer to ISS device
1085  *
1086  * return negative error code or zero on success
1087  */
1088 static int iss_create_links(struct iss_device *iss)
1089 {
1090         int ret;
1091 
1092         ret = omap4iss_csi2_create_links(iss);
1093         if (ret < 0) {
1094                 dev_err(iss->dev, "CSI2 pads links creation failed\n");
1095                 return ret;
1096         }
1097 
1098         ret = omap4iss_ipipeif_create_links(iss);
1099         if (ret < 0) {
1100                 dev_err(iss->dev, "ISP IPIPEIF pads links creation failed\n");
1101                 return ret;
1102         }
1103 
1104         ret = omap4iss_resizer_create_links(iss);
1105         if (ret < 0) {
1106                 dev_err(iss->dev, "ISP RESIZER pads links creation failed\n");
1107                 return ret;
1108         }
1109 
1110         /* Connect the submodules. */
1111         ret = media_create_pad_link(
1112                         &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1113                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1114         if (ret < 0)
1115                 return ret;
1116 
1117         ret = media_create_pad_link(
1118                         &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1119                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1120         if (ret < 0)
1121                 return ret;
1122 
1123         ret = media_create_pad_link(
1124                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1125                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1126         if (ret < 0)
1127                 return ret;
1128 
1129         ret = media_create_pad_link(
1130                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1131                         &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1132         if (ret < 0)
1133                 return ret;
1134 
1135         ret = media_create_pad_link(
1136                         &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1137                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1138         if (ret < 0)
1139                 return ret;
1140 
1141         return 0;
1142 };
1143 
1144 static void iss_cleanup_modules(struct iss_device *iss)
1145 {
1146         omap4iss_csi2_cleanup(iss);
1147         omap4iss_ipipeif_cleanup(iss);
1148         omap4iss_ipipe_cleanup(iss);
1149         omap4iss_resizer_cleanup(iss);
1150 }
1151 
1152 static int iss_initialize_modules(struct iss_device *iss)
1153 {
1154         int ret;
1155 
1156         ret = omap4iss_csiphy_init(iss);
1157         if (ret < 0) {
1158                 dev_err(iss->dev, "CSI PHY initialization failed\n");
1159                 goto error_csiphy;
1160         }
1161 
1162         ret = omap4iss_csi2_init(iss);
1163         if (ret < 0) {
1164                 dev_err(iss->dev, "CSI2 initialization failed\n");
1165                 goto error_csi2;
1166         }
1167 
1168         ret = omap4iss_ipipeif_init(iss);
1169         if (ret < 0) {
1170                 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1171                 goto error_ipipeif;
1172         }
1173 
1174         ret = omap4iss_ipipe_init(iss);
1175         if (ret < 0) {
1176                 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1177                 goto error_ipipe;
1178         }
1179 
1180         ret = omap4iss_resizer_init(iss);
1181         if (ret < 0) {
1182                 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1183                 goto error_resizer;
1184         }
1185 
1186         return 0;
1187 
1188 error_resizer:
1189         omap4iss_ipipe_cleanup(iss);
1190 error_ipipe:
1191         omap4iss_ipipeif_cleanup(iss);
1192 error_ipipeif:
1193         omap4iss_csi2_cleanup(iss);
1194 error_csi2:
1195 error_csiphy:
1196         return ret;
1197 }
1198 
1199 static int iss_probe(struct platform_device *pdev)
1200 {
1201         struct iss_platform_data *pdata = pdev->dev.platform_data;
1202         struct iss_device *iss;
1203         unsigned int i;
1204         int ret;
1205 
1206         if (!pdata)
1207                 return -EINVAL;
1208 
1209         iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1210         if (!iss)
1211                 return -ENOMEM;
1212 
1213         mutex_init(&iss->iss_mutex);
1214 
1215         iss->dev = &pdev->dev;
1216         iss->pdata = pdata;
1217 
1218         iss->raw_dmamask = DMA_BIT_MASK(32);
1219         iss->dev->dma_mask = &iss->raw_dmamask;
1220         iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1221 
1222         platform_set_drvdata(pdev, iss);
1223 
1224         /*
1225          * TODO: When implementing DT support switch to syscon regmap lookup by
1226          * phandle.
1227          */
1228         iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
1229         if (IS_ERR(iss->syscon)) {
1230                 ret = PTR_ERR(iss->syscon);
1231                 goto error;
1232         }
1233 
1234         /* Clocks */
1235         ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1236         if (ret < 0)
1237                 goto error;
1238 
1239         ret = iss_get_clocks(iss);
1240         if (ret < 0)
1241                 goto error;
1242 
1243         if (!omap4iss_get(iss))
1244                 goto error;
1245 
1246         ret = iss_reset(iss);
1247         if (ret < 0)
1248                 goto error_iss;
1249 
1250         iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1251         dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1252 
1253         for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1254                 ret = iss_map_mem_resource(pdev, iss, i);
1255                 if (ret)
1256                         goto error_iss;
1257         }
1258 
1259         /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1260         iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1261                        BTE_CTRL_BW_LIMITER_MASK,
1262                        18 << BTE_CTRL_BW_LIMITER_SHIFT);
1263 
1264         /* Perform ISP reset */
1265         ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1266         if (ret < 0)
1267                 goto error_iss;
1268 
1269         ret = iss_isp_reset(iss);
1270         if (ret < 0)
1271                 goto error_iss;
1272 
1273         dev_info(iss->dev, "ISP Revision %08x found\n",
1274                  iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1275 
1276         /* Interrupt */
1277         ret = platform_get_irq(pdev, 0);
1278         if (ret <= 0) {
1279                 dev_err(iss->dev, "No IRQ resource\n");
1280                 ret = -ENODEV;
1281                 goto error_iss;
1282         }
1283         iss->irq_num = ret;
1284 
1285         if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1286                              "OMAP4 ISS", iss)) {
1287                 dev_err(iss->dev, "Unable to request IRQ\n");
1288                 ret = -EINVAL;
1289                 goto error_iss;
1290         }
1291 
1292         /* Entities */
1293         ret = iss_initialize_modules(iss);
1294         if (ret < 0)
1295                 goto error_iss;
1296 
1297         ret = iss_register_entities(iss);
1298         if (ret < 0)
1299                 goto error_modules;
1300 
1301         ret = media_entity_enum_init(&iss->crashed, &iss->media_dev);
1302         if (ret)
1303                 goto error_entities;
1304 
1305         ret = iss_create_links(iss);
1306         if (ret < 0)
1307                 goto error_entities;
1308 
1309         omap4iss_put(iss);
1310 
1311         return 0;
1312 
1313 error_entities:
1314         iss_unregister_entities(iss);
1315         media_entity_enum_cleanup(&iss->crashed);
1316 error_modules:
1317         iss_cleanup_modules(iss);
1318 error_iss:
1319         omap4iss_put(iss);
1320 error:
1321         mutex_destroy(&iss->iss_mutex);
1322 
1323         return ret;
1324 }
1325 
1326 static int iss_remove(struct platform_device *pdev)
1327 {
1328         struct iss_device *iss = platform_get_drvdata(pdev);
1329 
1330         iss_unregister_entities(iss);
1331         media_entity_enum_cleanup(&iss->crashed);
1332         iss_cleanup_modules(iss);
1333 
1334         return 0;
1335 }
1336 
1337 static const struct platform_device_id omap4iss_id_table[] = {
1338         { "omap4iss", 0 },
1339         { },
1340 };
1341 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1342 
1343 static struct platform_driver iss_driver = {
1344         .probe          = iss_probe,
1345         .remove         = iss_remove,
1346         .id_table       = omap4iss_id_table,
1347         .driver = {
1348                 .name   = "omap4iss",
1349         },
1350 };
1351 
1352 module_platform_driver(iss_driver);
1353 
1354 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1355 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1356 MODULE_LICENSE("GPL");
1357 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);
1358 

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