Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

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

  1 /*
  2  * TI OMAP4 ISS V4L2 Driver
  3  *
  4  * Copyright (C) 2012, Texas Instruments
  5  *
  6  * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  */
 13 
 14 #include <linux/clk.h>
 15 #include <linux/delay.h>
 16 #include <linux/device.h>
 17 #include <linux/dma-mapping.h>
 18 #include <linux/i2c.h>
 19 #include <linux/interrupt.h>
 20 #include <linux/module.h>
 21 #include <linux/platform_device.h>
 22 #include <linux/slab.h>
 23 #include <linux/sched.h>
 24 #include <linux/vmalloc.h>
 25 
 26 #include <media/v4l2-common.h>
 27 #include <media/v4l2-device.h>
 28 #include <media/v4l2-ctrls.h>
 29 
 30 #include "iss.h"
 31 #include "iss_regs.h"
 32 
 33 #define ISS_PRINT_REGISTER(iss, name)\
 34         dev_dbg(iss->dev, "###ISS " #name "=0x%08x\n", \
 35                 iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_##name))
 36 
 37 static void iss_print_status(struct iss_device *iss)
 38 {
 39         dev_dbg(iss->dev, "-------------ISS HL Register dump-------------\n");
 40 
 41         ISS_PRINT_REGISTER(iss, HL_REVISION);
 42         ISS_PRINT_REGISTER(iss, HL_SYSCONFIG);
 43         ISS_PRINT_REGISTER(iss, HL_IRQSTATUS(5));
 44         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_SET(5));
 45         ISS_PRINT_REGISTER(iss, HL_IRQENABLE_CLR(5));
 46         ISS_PRINT_REGISTER(iss, CTRL);
 47         ISS_PRINT_REGISTER(iss, CLKCTRL);
 48         ISS_PRINT_REGISTER(iss, CLKSTAT);
 49 
 50         dev_dbg(iss->dev, "-----------------------------------------------\n");
 51 }
 52 
 53 /*
 54  * omap4iss_flush - Post pending L3 bus writes by doing a register readback
 55  * @iss: OMAP4 ISS device
 56  *
 57  * In order to force posting of pending writes, we need to write and
 58  * readback the same register, in this case the revision register.
 59  *
 60  * See this link for reference:
 61  *   http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
 62  */
 63 void omap4iss_flush(struct iss_device *iss)
 64 {
 65         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION, 0);
 66         iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
 67 }
 68 
 69 /*
 70  * iss_isp_enable_interrupts - Enable ISS ISP interrupts.
 71  * @iss: OMAP4 ISS device
 72  */
 73 static void omap4iss_isp_enable_interrupts(struct iss_device *iss)
 74 {
 75         static const u32 isp_irq = ISP5_IRQ_OCP_ERR |
 76                                    ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
 77                                    ISP5_IRQ_RSZ_FIFO_OVF |
 78                                    ISP5_IRQ_RSZ_INT_DMA |
 79                                    ISP5_IRQ_ISIF_INT(0);
 80 
 81         /* Enable ISP interrupts */
 82         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0), isp_irq);
 83         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_SET(0),
 84                       isp_irq);
 85 }
 86 
 87 /*
 88  * iss_isp_disable_interrupts - Disable ISS interrupts.
 89  * @iss: OMAP4 ISS device
 90  */
 91 static void omap4iss_isp_disable_interrupts(struct iss_device *iss)
 92 {
 93         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_CLR(0), ~0);
 94 }
 95 
 96 /*
 97  * iss_enable_interrupts - Enable ISS interrupts.
 98  * @iss: OMAP4 ISS device
 99  */
100 static void iss_enable_interrupts(struct iss_device *iss)
101 {
102         static const u32 hl_irq = ISS_HL_IRQ_CSIA | ISS_HL_IRQ_CSIB
103                                 | ISS_HL_IRQ_ISP(0);
104 
105         /* Enable HL interrupts */
106         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), hl_irq);
107         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_SET(5), hl_irq);
108 
109         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
110                 omap4iss_isp_enable_interrupts(iss);
111 }
112 
113 /*
114  * iss_disable_interrupts - Disable ISS interrupts.
115  * @iss: OMAP4 ISS device
116  */
117 static void iss_disable_interrupts(struct iss_device *iss)
118 {
119         if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
120                 omap4iss_isp_disable_interrupts(iss);
121 
122         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_CLR(5), ~0);
123 }
124 
125 int omap4iss_get_external_info(struct iss_pipeline *pipe,
126                                struct media_link *link)
127 {
128         struct iss_device *iss =
129                 container_of(pipe, struct iss_video, pipe)->iss;
130         struct v4l2_subdev_format fmt;
131         struct v4l2_ctrl *ctrl;
132         int ret;
133 
134         if (!pipe->external)
135                 return 0;
136 
137         if (pipe->external_rate)
138                 return 0;
139 
140         memset(&fmt, 0, sizeof(fmt));
141 
142         fmt.pad = link->source->index;
143         fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
144         ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(link->sink->entity),
145                                pad, get_fmt, NULL, &fmt);
146         if (ret < 0)
147                 return -EPIPE;
148 
149         pipe->external_bpp = omap4iss_video_format_info(fmt.format.code)->bpp;
150 
151         ctrl = v4l2_ctrl_find(pipe->external->ctrl_handler,
152                               V4L2_CID_PIXEL_RATE);
153         if (ctrl == NULL) {
154                 dev_warn(iss->dev, "no pixel rate control in subdev %s\n",
155                          pipe->external->name);
156                 return -EPIPE;
157         }
158 
159         pipe->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
160 
161         return 0;
162 }
163 
164 /*
165  * Configure the bridge. Valid inputs are
166  *
167  * IPIPEIF_INPUT_CSI2A: CSI2a receiver
168  * IPIPEIF_INPUT_CSI2B: CSI2b receiver
169  *
170  * The bridge and lane shifter are configured according to the selected input
171  * and the ISP platform data.
172  */
173 void omap4iss_configure_bridge(struct iss_device *iss,
174                                enum ipipeif_input_entity input)
175 {
176         u32 issctrl_val;
177         u32 isp5ctrl_val;
178 
179         issctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL);
180         issctrl_val &= ~ISS_CTRL_INPUT_SEL_MASK;
181         issctrl_val &= ~ISS_CTRL_CLK_DIV_MASK;
182 
183         isp5ctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL);
184 
185         switch (input) {
186         case IPIPEIF_INPUT_CSI2A:
187                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2A;
188                 break;
189 
190         case IPIPEIF_INPUT_CSI2B:
191                 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2B;
192                 break;
193 
194         default:
195                 return;
196         }
197 
198         issctrl_val |= ISS_CTRL_SYNC_DETECT_VS_RAISING;
199 
200         isp5ctrl_val |= ISP5_CTRL_VD_PULSE_EXT | ISP5_CTRL_PSYNC_CLK_SEL |
201                         ISP5_CTRL_SYNC_ENABLE;
202 
203         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL, issctrl_val);
204         iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, isp5ctrl_val);
205 }
206 
207 #ifdef ISS_ISR_DEBUG
208 static void iss_isr_dbg(struct iss_device *iss, u32 irqstatus)
209 {
210         static const char * const name[] = {
211                 "ISP_0",
212                 "ISP_1",
213                 "ISP_2",
214                 "ISP_3",
215                 "CSIA",
216                 "CSIB",
217                 "CCP2_0",
218                 "CCP2_1",
219                 "CCP2_2",
220                 "CCP2_3",
221                 "CBUFF",
222                 "BTE",
223                 "SIMCOP_0",
224                 "SIMCOP_1",
225                 "SIMCOP_2",
226                 "SIMCOP_3",
227                 "CCP2_8",
228                 "HS_VS",
229                 "18",
230                 "19",
231                 "20",
232                 "21",
233                 "22",
234                 "23",
235                 "24",
236                 "25",
237                 "26",
238                 "27",
239                 "28",
240                 "29",
241                 "30",
242                 "31",
243         };
244         unsigned int i;
245 
246         dev_dbg(iss->dev, "ISS IRQ: ");
247 
248         for (i = 0; i < ARRAY_SIZE(name); i++) {
249                 if ((1 << i) & irqstatus)
250                         pr_cont("%s ", name[i]);
251         }
252         pr_cont("\n");
253 }
254 
255 static void iss_isp_isr_dbg(struct iss_device *iss, u32 irqstatus)
256 {
257         static const char * const name[] = {
258                 "ISIF_0",
259                 "ISIF_1",
260                 "ISIF_2",
261                 "ISIF_3",
262                 "IPIPEREQ",
263                 "IPIPELAST_PIX",
264                 "IPIPEDMA",
265                 "IPIPEBSC",
266                 "IPIPEHST",
267                 "IPIPEIF",
268                 "AEW",
269                 "AF",
270                 "H3A",
271                 "RSZ_REG",
272                 "RSZ_LAST_PIX",
273                 "RSZ_DMA",
274                 "RSZ_CYC_RZA",
275                 "RSZ_CYC_RZB",
276                 "RSZ_FIFO_OVF",
277                 "RSZ_FIFO_IN_BLK_ERR",
278                 "20",
279                 "21",
280                 "RSZ_EOF0",
281                 "RSZ_EOF1",
282                 "H3A_EOF",
283                 "IPIPE_EOF",
284                 "26",
285                 "IPIPE_DPC_INI",
286                 "IPIPE_DPC_RNEW0",
287                 "IPIPE_DPC_RNEW1",
288                 "30",
289                 "OCP_ERR",
290         };
291         unsigned int i;
292 
293         dev_dbg(iss->dev, "ISP IRQ: ");
294 
295         for (i = 0; i < ARRAY_SIZE(name); i++) {
296                 if ((1 << i) & irqstatus)
297                         pr_cont("%s ", name[i]);
298         }
299         pr_cont("\n");
300 }
301 #endif
302 
303 /*
304  * iss_isr - Interrupt Service Routine for ISS module.
305  * @irq: Not used currently.
306  * @_iss: Pointer to the OMAP4 ISS device
307  *
308  * Handles the corresponding callback if plugged in.
309  *
310  * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
311  * IRQ wasn't handled.
312  */
313 static irqreturn_t iss_isr(int irq, void *_iss)
314 {
315         static const u32 ipipeif_events = ISP5_IRQ_IPIPEIF_IRQ |
316                                           ISP5_IRQ_ISIF_INT(0);
317         static const u32 resizer_events = ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
318                                           ISP5_IRQ_RSZ_FIFO_OVF |
319                                           ISP5_IRQ_RSZ_INT_DMA;
320         struct iss_device *iss = _iss;
321         u32 irqstatus;
322 
323         irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5));
324         iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), irqstatus);
325 
326         if (irqstatus & ISS_HL_IRQ_CSIA)
327                 omap4iss_csi2_isr(&iss->csi2a);
328 
329         if (irqstatus & ISS_HL_IRQ_CSIB)
330                 omap4iss_csi2_isr(&iss->csi2b);
331 
332         if (irqstatus & ISS_HL_IRQ_ISP(0)) {
333                 u32 isp_irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
334                                                  ISP5_IRQSTATUS(0));
335                 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0),
336                               isp_irqstatus);
337 
338                 if (isp_irqstatus & ISP5_IRQ_OCP_ERR)
339                         dev_dbg(iss->dev, "ISP5 OCP Error!\n");
340 
341                 if (isp_irqstatus & ipipeif_events) {
342                         omap4iss_ipipeif_isr(&iss->ipipeif,
343                                              isp_irqstatus & ipipeif_events);
344                 }
345 
346                 if (isp_irqstatus & resizer_events)
347                         omap4iss_resizer_isr(&iss->resizer,
348                                              isp_irqstatus & resizer_events);
349 
350 #ifdef ISS_ISR_DEBUG
351                 iss_isp_isr_dbg(iss, isp_irqstatus);
352 #endif
353         }
354 
355         omap4iss_flush(iss);
356 
357 #ifdef ISS_ISR_DEBUG
358         iss_isr_dbg(iss, irqstatus);
359 #endif
360 
361         return IRQ_HANDLED;
362 }
363 
364 /* -----------------------------------------------------------------------------
365  * Pipeline power management
366  *
367  * Entities must be powered up when part of a pipeline that contains at least
368  * one open video device node.
369  *
370  * To achieve this use the entity use_count field to track the number of users.
371  * For entities corresponding to video device nodes the use_count field stores
372  * the users count of the node. For entities corresponding to subdevs the
373  * use_count field stores the total number of users of all video device nodes
374  * in the pipeline.
375  *
376  * The omap4iss_pipeline_pm_use() function must be called in the open() and
377  * close() handlers of video device nodes. It increments or decrements the use
378  * count of all subdev entities in the pipeline.
379  *
380  * To react to link management on powered pipelines, the link setup notification
381  * callback updates the use count of all entities in the source and sink sides
382  * of the link.
383  */
384 
385 /*
386  * iss_pipeline_pm_use_count - Count the number of users of a pipeline
387  * @entity: The entity
388  *
389  * Return the total number of users of all video device nodes in the pipeline.
390  */
391 static int iss_pipeline_pm_use_count(struct media_entity *entity)
392 {
393         struct media_entity_graph graph;
394         int use = 0;
395 
396         media_entity_graph_walk_start(&graph, entity);
397 
398         while ((entity = media_entity_graph_walk_next(&graph))) {
399                 if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
400                         use += entity->use_count;
401         }
402 
403         return use;
404 }
405 
406 /*
407  * iss_pipeline_pm_power_one - Apply power change to an entity
408  * @entity: The entity
409  * @change: Use count change
410  *
411  * Change the entity use count by @change. If the entity is a subdev update its
412  * power state by calling the core::s_power operation when the use count goes
413  * from 0 to != 0 or from != 0 to 0.
414  *
415  * Return 0 on success or a negative error code on failure.
416  */
417 static int iss_pipeline_pm_power_one(struct media_entity *entity, int change)
418 {
419         struct v4l2_subdev *subdev;
420 
421         subdev = media_entity_type(entity) == MEDIA_ENT_T_V4L2_SUBDEV
422                ? media_entity_to_v4l2_subdev(entity) : NULL;
423 
424         if (entity->use_count == 0 && change > 0 && subdev != NULL) {
425                 int ret;
426 
427                 ret = v4l2_subdev_call(subdev, core, s_power, 1);
428                 if (ret < 0 && ret != -ENOIOCTLCMD)
429                         return ret;
430         }
431 
432         entity->use_count += change;
433         WARN_ON(entity->use_count < 0);
434 
435         if (entity->use_count == 0 && change < 0 && subdev != NULL)
436                 v4l2_subdev_call(subdev, core, s_power, 0);
437 
438         return 0;
439 }
440 
441 /*
442  * iss_pipeline_pm_power - Apply power change to all entities in a pipeline
443  * @entity: The entity
444  * @change: Use count change
445  *
446  * Walk the pipeline to update the use count and the power state of all non-node
447  * entities.
448  *
449  * Return 0 on success or a negative error code on failure.
450  */
451 static int iss_pipeline_pm_power(struct media_entity *entity, int change)
452 {
453         struct media_entity_graph graph;
454         struct media_entity *first = entity;
455         int ret = 0;
456 
457         if (!change)
458                 return 0;
459 
460         media_entity_graph_walk_start(&graph, entity);
461 
462         while (!ret && (entity = media_entity_graph_walk_next(&graph)))
463                 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
464                         ret = iss_pipeline_pm_power_one(entity, change);
465 
466         if (!ret)
467                 return 0;
468 
469         media_entity_graph_walk_start(&graph, first);
470 
471         while ((first = media_entity_graph_walk_next(&graph))
472                && first != entity)
473                 if (media_entity_type(first) != MEDIA_ENT_T_DEVNODE)
474                         iss_pipeline_pm_power_one(first, -change);
475 
476         return ret;
477 }
478 
479 /*
480  * omap4iss_pipeline_pm_use - Update the use count of an entity
481  * @entity: The entity
482  * @use: Use (1) or stop using (0) the entity
483  *
484  * Update the use count of all entities in the pipeline and power entities on or
485  * off accordingly.
486  *
487  * Return 0 on success or a negative error code on failure. Powering entities
488  * off is assumed to never fail. No failure can occur when the use parameter is
489  * set to 0.
490  */
491 int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
492 {
493         int change = use ? 1 : -1;
494         int ret;
495 
496         mutex_lock(&entity->parent->graph_mutex);
497 
498         /* Apply use count to node. */
499         entity->use_count += change;
500         WARN_ON(entity->use_count < 0);
501 
502         /* Apply power change to connected non-nodes. */
503         ret = iss_pipeline_pm_power(entity, change);
504         if (ret < 0)
505                 entity->use_count -= change;
506 
507         mutex_unlock(&entity->parent->graph_mutex);
508 
509         return ret;
510 }
511 
512 /*
513  * iss_pipeline_link_notify - Link management notification callback
514  * @link: The link
515  * @flags: New link flags that will be applied
516  *
517  * React to link management on powered pipelines by updating the use count of
518  * all entities in the source and sink sides of the link. Entities are powered
519  * on or off accordingly.
520  *
521  * Return 0 on success or a negative error code on failure. Powering entities
522  * off is assumed to never fail. This function will not fail for disconnection
523  * events.
524  */
525 static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
526                                     unsigned int notification)
527 {
528         struct media_entity *source = link->source->entity;
529         struct media_entity *sink = link->sink->entity;
530         int source_use = iss_pipeline_pm_use_count(source);
531         int sink_use = iss_pipeline_pm_use_count(sink);
532         int ret;
533 
534         if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
535             !(link->flags & MEDIA_LNK_FL_ENABLED)) {
536                 /* Powering off entities is assumed to never fail. */
537                 iss_pipeline_pm_power(source, -sink_use);
538                 iss_pipeline_pm_power(sink, -source_use);
539                 return 0;
540         }
541 
542         if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
543                 (flags & MEDIA_LNK_FL_ENABLED)) {
544                 ret = iss_pipeline_pm_power(source, sink_use);
545                 if (ret < 0)
546                         return ret;
547 
548                 ret = iss_pipeline_pm_power(sink, source_use);
549                 if (ret < 0)
550                         iss_pipeline_pm_power(source, -sink_use);
551 
552                 return ret;
553         }
554 
555         return 0;
556 }
557 
558 /* -----------------------------------------------------------------------------
559  * Pipeline stream management
560  */
561 
562 /*
563  * iss_pipeline_enable - Enable streaming on a pipeline
564  * @pipe: ISS pipeline
565  * @mode: Stream mode (single shot or continuous)
566  *
567  * Walk the entities chain starting at the pipeline output video node and start
568  * all modules in the chain in the given mode.
569  *
570  * Return 0 if successful, or the return value of the failed video::s_stream
571  * operation otherwise.
572  */
573 static int iss_pipeline_enable(struct iss_pipeline *pipe,
574                                enum iss_pipeline_stream_state mode)
575 {
576         struct iss_device *iss = pipe->output->iss;
577         struct media_entity *entity;
578         struct media_pad *pad;
579         struct v4l2_subdev *subdev;
580         unsigned long flags;
581         int ret;
582 
583         /* If one of the entities in the pipeline has crashed it will not work
584          * properly. Refuse to start streaming in that case. This check must be
585          * performed before the loop below to avoid starting entities if the
586          * pipeline won't start anyway (those entities would then likely fail to
587          * stop, making the problem worse).
588          */
589         if (pipe->entities & iss->crashed)
590                 return -EIO;
591 
592         spin_lock_irqsave(&pipe->lock, flags);
593         pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
594         spin_unlock_irqrestore(&pipe->lock, flags);
595 
596         pipe->do_propagation = false;
597 
598         entity = &pipe->output->video.entity;
599         while (1) {
600                 pad = &entity->pads[0];
601                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
602                         break;
603 
604                 pad = media_entity_remote_pad(pad);
605                 if (pad == NULL ||
606                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
607                         break;
608 
609                 entity = pad->entity;
610                 subdev = media_entity_to_v4l2_subdev(entity);
611 
612                 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
613                 if (ret < 0 && ret != -ENOIOCTLCMD)
614                         return ret;
615         }
616         iss_print_status(pipe->output->iss);
617         return 0;
618 }
619 
620 /*
621  * iss_pipeline_disable - Disable streaming on a pipeline
622  * @pipe: ISS pipeline
623  *
624  * Walk the entities chain starting at the pipeline output video node and stop
625  * all modules in the chain. Wait synchronously for the modules to be stopped if
626  * necessary.
627  */
628 static int iss_pipeline_disable(struct iss_pipeline *pipe)
629 {
630         struct iss_device *iss = pipe->output->iss;
631         struct media_entity *entity;
632         struct media_pad *pad;
633         struct v4l2_subdev *subdev;
634         int failure = 0;
635         int ret;
636 
637         entity = &pipe->output->video.entity;
638         while (1) {
639                 pad = &entity->pads[0];
640                 if (!(pad->flags & MEDIA_PAD_FL_SINK))
641                         break;
642 
643                 pad = media_entity_remote_pad(pad);
644                 if (pad == NULL ||
645                     media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
646                         break;
647 
648                 entity = pad->entity;
649                 subdev = media_entity_to_v4l2_subdev(entity);
650 
651                 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
652                 if (ret < 0) {
653                         dev_dbg(iss->dev, "%s: module stop timeout.\n",
654                                 subdev->name);
655                         /* If the entity failed to stopped, assume it has
656                          * crashed. Mark it as such, the ISS will be reset when
657                          * applications will release it.
658                          */
659                         iss->crashed |= 1U << subdev->entity.id;
660                         failure = -ETIMEDOUT;
661                 }
662         }
663 
664         return failure;
665 }
666 
667 /*
668  * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
669  * @pipe: ISS pipeline
670  * @state: Stream state (stopped, single shot or continuous)
671  *
672  * Set the pipeline to the given stream state. Pipelines can be started in
673  * single-shot or continuous mode.
674  *
675  * Return 0 if successful, or the return value of the failed video::s_stream
676  * operation otherwise. The pipeline state is not updated when the operation
677  * fails, except when stopping the pipeline.
678  */
679 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
680                                  enum iss_pipeline_stream_state state)
681 {
682         int ret;
683 
684         if (state == ISS_PIPELINE_STREAM_STOPPED)
685                 ret = iss_pipeline_disable(pipe);
686         else
687                 ret = iss_pipeline_enable(pipe, state);
688 
689         if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
690                 pipe->stream_state = state;
691 
692         return ret;
693 }
694 
695 /*
696  * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
697  * @pipe: ISS pipeline
698  *
699  * Cancelling a stream mark all buffers on all video nodes in the pipeline as
700  * erroneous and makes sure no new buffer can be queued. This function is called
701  * when a fatal error that prevents any further operation on the pipeline
702  * occurs.
703  */
704 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
705 {
706         if (pipe->input)
707                 omap4iss_video_cancel_stream(pipe->input);
708         if (pipe->output)
709                 omap4iss_video_cancel_stream(pipe->output);
710 }
711 
712 /*
713  * iss_pipeline_is_last - Verify if entity has an enabled link to the output
714  *                        video node
715  * @me: ISS module's media entity
716  *
717  * Returns 1 if the entity has an enabled link to the output video node or 0
718  * otherwise. It's true only while pipeline can have no more than one output
719  * node.
720  */
721 static int iss_pipeline_is_last(struct media_entity *me)
722 {
723         struct iss_pipeline *pipe;
724         struct media_pad *pad;
725 
726         if (!me->pipe)
727                 return 0;
728         pipe = to_iss_pipeline(me);
729         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
730                 return 0;
731         pad = media_entity_remote_pad(&pipe->output->pad);
732         return pad->entity == me;
733 }
734 
735 static int iss_reset(struct iss_device *iss)
736 {
737         unsigned int timeout;
738 
739         iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
740                     ISS_HL_SYSCONFIG_SOFTRESET);
741 
742         timeout = iss_poll_condition_timeout(
743                 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
744                 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
745         if (timeout) {
746                 dev_err(iss->dev, "ISS reset timeout\n");
747                 return -ETIMEDOUT;
748         }
749 
750         iss->crashed = 0;
751         return 0;
752 }
753 
754 static int iss_isp_reset(struct iss_device *iss)
755 {
756         unsigned int timeout;
757 
758         /* Fist, ensure that the ISP is IDLE (no transactions happening) */
759         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
760                        ISP5_SYSCONFIG_STANDBYMODE_MASK,
761                        ISP5_SYSCONFIG_STANDBYMODE_SMART);
762 
763         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
764 
765         timeout = iss_poll_condition_timeout(
766                 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
767                 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
768         if (timeout) {
769                 dev_err(iss->dev, "ISP5 standby timeout\n");
770                 return -ETIMEDOUT;
771         }
772 
773         /* Now finally, do the reset */
774         iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
775                     ISP5_SYSCONFIG_SOFTRESET);
776 
777         timeout = iss_poll_condition_timeout(
778                 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
779                 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
780         if (timeout) {
781                 dev_err(iss->dev, "ISP5 reset timeout\n");
782                 return -ETIMEDOUT;
783         }
784 
785         return 0;
786 }
787 
788 /*
789  * iss_module_sync_idle - Helper to sync module with its idle state
790  * @me: ISS submodule's media entity
791  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
792  * @stopping: flag which tells module wants to stop
793  *
794  * This function checks if ISS submodule needs to wait for next interrupt. If
795  * yes, makes the caller to sleep while waiting for such event.
796  */
797 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
798                               atomic_t *stopping)
799 {
800         struct iss_pipeline *pipe = to_iss_pipeline(me);
801         struct iss_video *video = pipe->output;
802         unsigned long flags;
803 
804         if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
805             (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
806              !iss_pipeline_ready(pipe)))
807                 return 0;
808 
809         /*
810          * atomic_set() doesn't include memory barrier on ARM platform for SMP
811          * scenario. We'll call it here to avoid race conditions.
812          */
813         atomic_set(stopping, 1);
814         smp_wmb();
815 
816         /*
817          * If module is the last one, it's writing to memory. In this case,
818          * it's necessary to check if the module is already paused due to
819          * DMA queue underrun or if it has to wait for next interrupt to be
820          * idle.
821          * If it isn't the last one, the function won't sleep but *stopping
822          * will still be set to warn next submodule caller's interrupt the
823          * module wants to be idle.
824          */
825         if (!iss_pipeline_is_last(me))
826                 return 0;
827 
828         spin_lock_irqsave(&video->qlock, flags);
829         if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
830                 spin_unlock_irqrestore(&video->qlock, flags);
831                 atomic_set(stopping, 0);
832                 smp_wmb();
833                 return 0;
834         }
835         spin_unlock_irqrestore(&video->qlock, flags);
836         if (!wait_event_timeout(*wait, !atomic_read(stopping),
837                                 msecs_to_jiffies(1000))) {
838                 atomic_set(stopping, 0);
839                 smp_wmb();
840                 return -ETIMEDOUT;
841         }
842 
843         return 0;
844 }
845 
846 /*
847  * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
848  * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
849  * @stopping: flag which tells module wants to stop
850  *
851  * This function checks if ISS submodule was stopping. In case of yes, it
852  * notices the caller by setting stopping to 0 and waking up the wait queue.
853  * Returns 1 if it was stopping or 0 otherwise.
854  */
855 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
856                                      atomic_t *stopping)
857 {
858         if (atomic_cmpxchg(stopping, 1, 0)) {
859                 wake_up(wait);
860                 return 1;
861         }
862 
863         return 0;
864 }
865 
866 /* --------------------------------------------------------------------------
867  * Clock management
868  */
869 
870 #define ISS_CLKCTRL_MASK        (ISS_CLKCTRL_CSI2_A |\
871                                  ISS_CLKCTRL_CSI2_B |\
872                                  ISS_CLKCTRL_ISP)
873 
874 static int __iss_subclk_update(struct iss_device *iss)
875 {
876         u32 clk = 0;
877         int ret = 0, timeout = 1000;
878 
879         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
880                 clk |= ISS_CLKCTRL_CSI2_A;
881 
882         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
883                 clk |= ISS_CLKCTRL_CSI2_B;
884 
885         if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
886                 clk |= ISS_CLKCTRL_ISP;
887 
888         iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
889                        ISS_CLKCTRL_MASK, clk);
890 
891         /* Wait for HW assertion */
892         while (--timeout > 0) {
893                 udelay(1);
894                 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
895                     ISS_CLKCTRL_MASK) == clk)
896                         break;
897         }
898 
899         if (!timeout)
900                 ret = -EBUSY;
901 
902         return ret;
903 }
904 
905 int omap4iss_subclk_enable(struct iss_device *iss,
906                             enum iss_subclk_resource res)
907 {
908         iss->subclk_resources |= res;
909 
910         return __iss_subclk_update(iss);
911 }
912 
913 int omap4iss_subclk_disable(struct iss_device *iss,
914                              enum iss_subclk_resource res)
915 {
916         iss->subclk_resources &= ~res;
917 
918         return __iss_subclk_update(iss);
919 }
920 
921 #define ISS_ISP5_CLKCTRL_MASK   (ISP5_CTRL_BL_CLK_ENABLE |\
922                                  ISP5_CTRL_ISIF_CLK_ENABLE |\
923                                  ISP5_CTRL_H3A_CLK_ENABLE |\
924                                  ISP5_CTRL_RSZ_CLK_ENABLE |\
925                                  ISP5_CTRL_IPIPE_CLK_ENABLE |\
926                                  ISP5_CTRL_IPIPEIF_CLK_ENABLE)
927 
928 static void __iss_isp_subclk_update(struct iss_device *iss)
929 {
930         u32 clk = 0;
931 
932         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
933                 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
934 
935         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
936                 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
937 
938         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
939                 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
940 
941         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
942                 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
943 
944         if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
945                 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
946 
947         if (clk)
948                 clk |= ISP5_CTRL_BL_CLK_ENABLE;
949 
950         iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
951                        ISS_ISP5_CLKCTRL_MASK, clk);
952 }
953 
954 void omap4iss_isp_subclk_enable(struct iss_device *iss,
955                                 enum iss_isp_subclk_resource res)
956 {
957         iss->isp_subclk_resources |= res;
958 
959         __iss_isp_subclk_update(iss);
960 }
961 
962 void omap4iss_isp_subclk_disable(struct iss_device *iss,
963                                  enum iss_isp_subclk_resource res)
964 {
965         iss->isp_subclk_resources &= ~res;
966 
967         __iss_isp_subclk_update(iss);
968 }
969 
970 /*
971  * iss_enable_clocks - Enable ISS clocks
972  * @iss: OMAP4 ISS device
973  *
974  * Return 0 if successful, or clk_enable return value if any of tthem fails.
975  */
976 static int iss_enable_clocks(struct iss_device *iss)
977 {
978         int ret;
979 
980         ret = clk_enable(iss->iss_fck);
981         if (ret) {
982                 dev_err(iss->dev, "clk_enable iss_fck failed\n");
983                 return ret;
984         }
985 
986         ret = clk_enable(iss->iss_ctrlclk);
987         if (ret) {
988                 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
989                 clk_disable(iss->iss_fck);
990                 return ret;
991         }
992 
993         return 0;
994 }
995 
996 /*
997  * iss_disable_clocks - Disable ISS clocks
998  * @iss: OMAP4 ISS device
999  */
1000 static void iss_disable_clocks(struct iss_device *iss)
1001 {
1002         clk_disable(iss->iss_ctrlclk);
1003         clk_disable(iss->iss_fck);
1004 }
1005 
1006 static int iss_get_clocks(struct iss_device *iss)
1007 {
1008         iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
1009         if (IS_ERR(iss->iss_fck)) {
1010                 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
1011                 return PTR_ERR(iss->iss_fck);
1012         }
1013 
1014         iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
1015         if (IS_ERR(iss->iss_ctrlclk)) {
1016                 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
1017                 return PTR_ERR(iss->iss_ctrlclk);
1018         }
1019 
1020         return 0;
1021 }
1022 
1023 /*
1024  * omap4iss_get - Acquire the ISS resource.
1025  *
1026  * Initializes the clocks for the first acquire.
1027  *
1028  * Increment the reference count on the ISS. If the first reference is taken,
1029  * enable clocks and power-up all submodules.
1030  *
1031  * Return a pointer to the ISS device structure, or NULL if an error occurred.
1032  */
1033 struct iss_device *omap4iss_get(struct iss_device *iss)
1034 {
1035         struct iss_device *__iss = iss;
1036 
1037         if (iss == NULL)
1038                 return NULL;
1039 
1040         mutex_lock(&iss->iss_mutex);
1041         if (iss->ref_count > 0)
1042                 goto out;
1043 
1044         if (iss_enable_clocks(iss) < 0) {
1045                 __iss = NULL;
1046                 goto out;
1047         }
1048 
1049         iss_enable_interrupts(iss);
1050 
1051 out:
1052         if (__iss != NULL)
1053                 iss->ref_count++;
1054         mutex_unlock(&iss->iss_mutex);
1055 
1056         return __iss;
1057 }
1058 
1059 /*
1060  * omap4iss_put - Release the ISS
1061  *
1062  * Decrement the reference count on the ISS. If the last reference is released,
1063  * power-down all submodules, disable clocks and free temporary buffers.
1064  */
1065 void omap4iss_put(struct iss_device *iss)
1066 {
1067         if (iss == NULL)
1068                 return;
1069 
1070         mutex_lock(&iss->iss_mutex);
1071         BUG_ON(iss->ref_count == 0);
1072         if (--iss->ref_count == 0) {
1073                 iss_disable_interrupts(iss);
1074                 /* Reset the ISS if an entity has failed to stop. This is the
1075                  * only way to recover from such conditions, although it would
1076                  * be worth investigating whether resetting the ISP only can't
1077                  * fix the problem in some cases.
1078                  */
1079                 if (iss->crashed)
1080                         iss_reset(iss);
1081                 iss_disable_clocks(iss);
1082         }
1083         mutex_unlock(&iss->iss_mutex);
1084 }
1085 
1086 static int iss_map_mem_resource(struct platform_device *pdev,
1087                                 struct iss_device *iss,
1088                                 enum iss_mem_resources res)
1089 {
1090         struct resource *mem;
1091 
1092         mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
1093 
1094         iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
1095 
1096         return PTR_ERR_OR_ZERO(iss->regs[res]);
1097 }
1098 
1099 static void iss_unregister_entities(struct iss_device *iss)
1100 {
1101         omap4iss_resizer_unregister_entities(&iss->resizer);
1102         omap4iss_ipipe_unregister_entities(&iss->ipipe);
1103         omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
1104         omap4iss_csi2_unregister_entities(&iss->csi2a);
1105         omap4iss_csi2_unregister_entities(&iss->csi2b);
1106 
1107         v4l2_device_unregister(&iss->v4l2_dev);
1108         media_device_unregister(&iss->media_dev);
1109 }
1110 
1111 /*
1112  * iss_register_subdev_group - Register a group of subdevices
1113  * @iss: OMAP4 ISS device
1114  * @board_info: I2C subdevs board information array
1115  *
1116  * Register all I2C subdevices in the board_info array. The array must be
1117  * terminated by a NULL entry, and the first entry must be the sensor.
1118  *
1119  * Return a pointer to the sensor media entity if it has been successfully
1120  * registered, or NULL otherwise.
1121  */
1122 static struct v4l2_subdev *
1123 iss_register_subdev_group(struct iss_device *iss,
1124                      struct iss_subdev_i2c_board_info *board_info)
1125 {
1126         struct v4l2_subdev *sensor = NULL;
1127         unsigned int first;
1128 
1129         if (board_info->board_info == NULL)
1130                 return NULL;
1131 
1132         for (first = 1; board_info->board_info; ++board_info, first = 0) {
1133                 struct v4l2_subdev *subdev;
1134                 struct i2c_adapter *adapter;
1135 
1136                 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
1137                 if (adapter == NULL) {
1138                         dev_err(iss->dev,
1139                                 "%s: Unable to get I2C adapter %d for device %s\n",
1140                                 __func__, board_info->i2c_adapter_id,
1141                                 board_info->board_info->type);
1142                         continue;
1143                 }
1144 
1145                 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
1146                                 board_info->board_info, NULL);
1147                 if (subdev == NULL) {
1148                         dev_err(iss->dev, "%s: Unable to register subdev %s\n",
1149                                 __func__, board_info->board_info->type);
1150                         continue;
1151                 }
1152 
1153                 if (first)
1154                         sensor = subdev;
1155         }
1156 
1157         return sensor;
1158 }
1159 
1160 static int iss_register_entities(struct iss_device *iss)
1161 {
1162         struct iss_platform_data *pdata = iss->pdata;
1163         struct iss_v4l2_subdevs_group *subdevs;
1164         int ret;
1165 
1166         iss->media_dev.dev = iss->dev;
1167         strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
1168                 sizeof(iss->media_dev.model));
1169         iss->media_dev.hw_revision = iss->revision;
1170         iss->media_dev.link_notify = iss_pipeline_link_notify;
1171         ret = media_device_register(&iss->media_dev);
1172         if (ret < 0) {
1173                 dev_err(iss->dev, "%s: Media device registration failed (%d)\n",
1174                         __func__, ret);
1175                 return ret;
1176         }
1177 
1178         iss->v4l2_dev.mdev = &iss->media_dev;
1179         ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1180         if (ret < 0) {
1181                 dev_err(iss->dev, "%s: V4L2 device registration failed (%d)\n",
1182                         __func__, ret);
1183                 goto done;
1184         }
1185 
1186         /* Register internal entities */
1187         ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1188         if (ret < 0)
1189                 goto done;
1190 
1191         ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1192         if (ret < 0)
1193                 goto done;
1194 
1195         ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1196         if (ret < 0)
1197                 goto done;
1198 
1199         ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1200         if (ret < 0)
1201                 goto done;
1202 
1203         ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1204         if (ret < 0)
1205                 goto done;
1206 
1207         /* Register external entities */
1208         for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1209                 struct v4l2_subdev *sensor;
1210                 struct media_entity *input;
1211                 unsigned int flags;
1212                 unsigned int pad;
1213 
1214                 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1215                 if (sensor == NULL)
1216                         continue;
1217 
1218                 sensor->host_priv = subdevs;
1219 
1220                 /* Connect the sensor to the correct interface module.
1221                  * CSI2a receiver through CSIPHY1, or
1222                  * CSI2b receiver through CSIPHY2
1223                  */
1224                 switch (subdevs->interface) {
1225                 case ISS_INTERFACE_CSI2A_PHY1:
1226                         input = &iss->csi2a.subdev.entity;
1227                         pad = CSI2_PAD_SINK;
1228                         flags = MEDIA_LNK_FL_IMMUTABLE
1229                               | MEDIA_LNK_FL_ENABLED;
1230                         break;
1231 
1232                 case ISS_INTERFACE_CSI2B_PHY2:
1233                         input = &iss->csi2b.subdev.entity;
1234                         pad = CSI2_PAD_SINK;
1235                         flags = MEDIA_LNK_FL_IMMUTABLE
1236                               | MEDIA_LNK_FL_ENABLED;
1237                         break;
1238 
1239                 default:
1240                         dev_err(iss->dev, "%s: invalid interface type %u\n",
1241                                 __func__, subdevs->interface);
1242                         ret = -EINVAL;
1243                         goto done;
1244                 }
1245 
1246                 ret = media_entity_create_link(&sensor->entity, 0, input, pad,
1247                                                flags);
1248                 if (ret < 0)
1249                         goto done;
1250         }
1251 
1252         ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1253 
1254 done:
1255         if (ret < 0)
1256                 iss_unregister_entities(iss);
1257 
1258         return ret;
1259 }
1260 
1261 static void iss_cleanup_modules(struct iss_device *iss)
1262 {
1263         omap4iss_csi2_cleanup(iss);
1264         omap4iss_ipipeif_cleanup(iss);
1265         omap4iss_ipipe_cleanup(iss);
1266         omap4iss_resizer_cleanup(iss);
1267 }
1268 
1269 static int iss_initialize_modules(struct iss_device *iss)
1270 {
1271         int ret;
1272 
1273         ret = omap4iss_csiphy_init(iss);
1274         if (ret < 0) {
1275                 dev_err(iss->dev, "CSI PHY initialization failed\n");
1276                 goto error_csiphy;
1277         }
1278 
1279         ret = omap4iss_csi2_init(iss);
1280         if (ret < 0) {
1281                 dev_err(iss->dev, "CSI2 initialization failed\n");
1282                 goto error_csi2;
1283         }
1284 
1285         ret = omap4iss_ipipeif_init(iss);
1286         if (ret < 0) {
1287                 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1288                 goto error_ipipeif;
1289         }
1290 
1291         ret = omap4iss_ipipe_init(iss);
1292         if (ret < 0) {
1293                 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1294                 goto error_ipipe;
1295         }
1296 
1297         ret = omap4iss_resizer_init(iss);
1298         if (ret < 0) {
1299                 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1300                 goto error_resizer;
1301         }
1302 
1303         /* Connect the submodules. */
1304         ret = media_entity_create_link(
1305                         &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1306                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1307         if (ret < 0)
1308                 goto error_link;
1309 
1310         ret = media_entity_create_link(
1311                         &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1312                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1313         if (ret < 0)
1314                 goto error_link;
1315 
1316         ret = media_entity_create_link(
1317                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1318                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1319         if (ret < 0)
1320                 goto error_link;
1321 
1322         ret = media_entity_create_link(
1323                         &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1324                         &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1325         if (ret < 0)
1326                 goto error_link;
1327 
1328         ret = media_entity_create_link(
1329                         &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1330                         &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1331         if (ret < 0)
1332                 goto error_link;
1333 
1334         return 0;
1335 
1336 error_link:
1337         omap4iss_resizer_cleanup(iss);
1338 error_resizer:
1339         omap4iss_ipipe_cleanup(iss);
1340 error_ipipe:
1341         omap4iss_ipipeif_cleanup(iss);
1342 error_ipipeif:
1343         omap4iss_csi2_cleanup(iss);
1344 error_csi2:
1345 error_csiphy:
1346         return ret;
1347 }
1348 
1349 static int iss_probe(struct platform_device *pdev)
1350 {
1351         struct iss_platform_data *pdata = pdev->dev.platform_data;
1352         struct iss_device *iss;
1353         unsigned int i;
1354         int ret;
1355 
1356         if (pdata == NULL)
1357                 return -EINVAL;
1358 
1359         iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1360         if (!iss) {
1361                 dev_err(&pdev->dev, "Could not allocate memory\n");
1362                 return -ENOMEM;
1363         }
1364 
1365         mutex_init(&iss->iss_mutex);
1366 
1367         iss->dev = &pdev->dev;
1368         iss->pdata = pdata;
1369 
1370         iss->raw_dmamask = DMA_BIT_MASK(32);
1371         iss->dev->dma_mask = &iss->raw_dmamask;
1372         iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1373 
1374         platform_set_drvdata(pdev, iss);
1375 
1376         /* Clocks */
1377         ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1378         if (ret < 0)
1379                 goto error;
1380 
1381         ret = iss_get_clocks(iss);
1382         if (ret < 0)
1383                 goto error;
1384 
1385         if (omap4iss_get(iss) == NULL)
1386                 goto error;
1387 
1388         ret = iss_reset(iss);
1389         if (ret < 0)
1390                 goto error_iss;
1391 
1392         iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1393         dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1394 
1395         for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1396                 ret = iss_map_mem_resource(pdev, iss, i);
1397                 if (ret)
1398                         goto error_iss;
1399         }
1400 
1401         /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1402         iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1403                        BTE_CTRL_BW_LIMITER_MASK,
1404                        18 << BTE_CTRL_BW_LIMITER_SHIFT);
1405 
1406         /* Perform ISP reset */
1407         ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1408         if (ret < 0)
1409                 goto error_iss;
1410 
1411         ret = iss_isp_reset(iss);
1412         if (ret < 0)
1413                 goto error_iss;
1414 
1415         dev_info(iss->dev, "ISP Revision %08x found\n",
1416                  iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1417 
1418         /* Interrupt */
1419         iss->irq_num = platform_get_irq(pdev, 0);
1420         if (iss->irq_num <= 0) {
1421                 dev_err(iss->dev, "No IRQ resource\n");
1422                 ret = -ENODEV;
1423                 goto error_iss;
1424         }
1425 
1426         if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1427                              "OMAP4 ISS", iss)) {
1428                 dev_err(iss->dev, "Unable to request IRQ\n");
1429                 ret = -EINVAL;
1430                 goto error_iss;
1431         }
1432 
1433         /* Entities */
1434         ret = iss_initialize_modules(iss);
1435         if (ret < 0)
1436                 goto error_iss;
1437 
1438         ret = iss_register_entities(iss);
1439         if (ret < 0)
1440                 goto error_modules;
1441 
1442         omap4iss_put(iss);
1443 
1444         return 0;
1445 
1446 error_modules:
1447         iss_cleanup_modules(iss);
1448 error_iss:
1449         omap4iss_put(iss);
1450 error:
1451         platform_set_drvdata(pdev, NULL);
1452 
1453         mutex_destroy(&iss->iss_mutex);
1454 
1455         return ret;
1456 }
1457 
1458 static int iss_remove(struct platform_device *pdev)
1459 {
1460         struct iss_device *iss = platform_get_drvdata(pdev);
1461 
1462         iss_unregister_entities(iss);
1463         iss_cleanup_modules(iss);
1464 
1465         return 0;
1466 }
1467 
1468 static struct platform_device_id omap4iss_id_table[] = {
1469         { "omap4iss", 0 },
1470         { },
1471 };
1472 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1473 
1474 static struct platform_driver iss_driver = {
1475         .probe          = iss_probe,
1476         .remove         = iss_remove,
1477         .id_table       = omap4iss_id_table,
1478         .driver = {
1479                 .owner  = THIS_MODULE,
1480                 .name   = "omap4iss",
1481         },
1482 };
1483 
1484 module_platform_driver(iss_driver);
1485 
1486 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1487 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1488 MODULE_LICENSE("GPL");
1489 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);
1490 

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