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
iss_print_status(struct iss_device * iss)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 */
omap4iss_flush(struct iss_device * iss)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 */
omap4iss_isp_enable_interrupts(struct iss_device * iss)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 */
omap4iss_isp_disable_interrupts(struct iss_device * iss)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 */
iss_enable_interrupts(struct iss_device * iss)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 */
iss_disable_interrupts(struct iss_device * iss)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
omap4iss_get_external_info(struct iss_pipeline * pipe,struct media_link * link)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 */
omap4iss_configure_bridge(struct iss_device * iss,enum ipipeif_input_entity input)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
iss_isr_dbg(struct iss_device * iss,u32 irqstatus)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
iss_isp_isr_dbg(struct iss_device * iss,u32 irqstatus)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 */
iss_isr(int irq,void * _iss)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 power management
367 *
368 * Entities must be powered up when part of a pipeline that contains at least
369 * one open video device node.
370 *
371 * To achieve this use the entity use_count field to track the number of users.
372 * For entities corresponding to video device nodes the use_count field stores
373 * the users count of the node. For entities corresponding to subdevs the
374 * use_count field stores the total number of users of all video device nodes
375 * in the pipeline.
376 *
377 * The omap4iss_pipeline_pm_use() function must be called in the open() and
378 * close() handlers of video device nodes. It increments or decrements the use
379 * count of all subdev entities in the pipeline.
380 *
381 * To react to link management on powered pipelines, the link setup notification
382 * callback updates the use count of all entities in the source and sink sides
383 * of the link.
384 */
385
386 /*
387 * iss_pipeline_pm_use_count - Count the number of users of a pipeline
388 * @entity: The entity
389 *
390 * Return the total number of users of all video device nodes in the pipeline.
391 */
iss_pipeline_pm_use_count(struct media_entity * entity)392 static int iss_pipeline_pm_use_count(struct media_entity *entity)
393 {
394 struct media_entity_graph graph;
395 int use = 0;
396
397 media_entity_graph_walk_start(&graph, entity);
398
399 while ((entity = media_entity_graph_walk_next(&graph))) {
400 if (media_entity_type(entity) == MEDIA_ENT_T_DEVNODE)
401 use += entity->use_count;
402 }
403
404 return use;
405 }
406
407 /*
408 * iss_pipeline_pm_power_one - Apply power change to an entity
409 * @entity: The entity
410 * @change: Use count change
411 *
412 * Change the entity use count by @change. If the entity is a subdev update its
413 * power state by calling the core::s_power operation when the use count goes
414 * from 0 to != 0 or from != 0 to 0.
415 *
416 * Return 0 on success or a negative error code on failure.
417 */
iss_pipeline_pm_power_one(struct media_entity * entity,int change)418 static int iss_pipeline_pm_power_one(struct media_entity *entity, int change)
419 {
420 struct v4l2_subdev *subdev;
421
422 subdev = media_entity_type(entity) == MEDIA_ENT_T_V4L2_SUBDEV
423 ? media_entity_to_v4l2_subdev(entity) : NULL;
424
425 if (entity->use_count == 0 && change > 0 && subdev) {
426 int ret;
427
428 ret = v4l2_subdev_call(subdev, core, s_power, 1);
429 if (ret < 0 && ret != -ENOIOCTLCMD)
430 return ret;
431 }
432
433 entity->use_count += change;
434 WARN_ON(entity->use_count < 0);
435
436 if (entity->use_count == 0 && change < 0 && subdev)
437 v4l2_subdev_call(subdev, core, s_power, 0);
438
439 return 0;
440 }
441
442 /*
443 * iss_pipeline_pm_power - Apply power change to all entities in a pipeline
444 * @entity: The entity
445 * @change: Use count change
446 *
447 * Walk the pipeline to update the use count and the power state of all non-node
448 * entities.
449 *
450 * Return 0 on success or a negative error code on failure.
451 */
iss_pipeline_pm_power(struct media_entity * entity,int change)452 static int iss_pipeline_pm_power(struct media_entity *entity, int change)
453 {
454 struct media_entity_graph graph;
455 struct media_entity *first = entity;
456 int ret = 0;
457
458 if (!change)
459 return 0;
460
461 media_entity_graph_walk_start(&graph, entity);
462
463 while (!ret && (entity = media_entity_graph_walk_next(&graph)))
464 if (media_entity_type(entity) != MEDIA_ENT_T_DEVNODE)
465 ret = iss_pipeline_pm_power_one(entity, change);
466
467 if (!ret)
468 return 0;
469
470 media_entity_graph_walk_start(&graph, first);
471
472 while ((first = media_entity_graph_walk_next(&graph)) &&
473 first != entity)
474 if (media_entity_type(first) != MEDIA_ENT_T_DEVNODE)
475 iss_pipeline_pm_power_one(first, -change);
476
477 return ret;
478 }
479
480 /*
481 * omap4iss_pipeline_pm_use - Update the use count of an entity
482 * @entity: The entity
483 * @use: Use (1) or stop using (0) the entity
484 *
485 * Update the use count of all entities in the pipeline and power entities on or
486 * off accordingly.
487 *
488 * Return 0 on success or a negative error code on failure. Powering entities
489 * off is assumed to never fail. No failure can occur when the use parameter is
490 * set to 0.
491 */
omap4iss_pipeline_pm_use(struct media_entity * entity,int use)492 int omap4iss_pipeline_pm_use(struct media_entity *entity, int use)
493 {
494 int change = use ? 1 : -1;
495 int ret;
496
497 mutex_lock(&entity->parent->graph_mutex);
498
499 /* Apply use count to node. */
500 entity->use_count += change;
501 WARN_ON(entity->use_count < 0);
502
503 /* Apply power change to connected non-nodes. */
504 ret = iss_pipeline_pm_power(entity, change);
505 if (ret < 0)
506 entity->use_count -= change;
507
508 mutex_unlock(&entity->parent->graph_mutex);
509
510 return ret;
511 }
512
513 /*
514 * iss_pipeline_link_notify - Link management notification callback
515 * @link: The link
516 * @flags: New link flags that will be applied
517 *
518 * React to link management on powered pipelines by updating the use count of
519 * all entities in the source and sink sides of the link. Entities are powered
520 * on or off accordingly.
521 *
522 * Return 0 on success or a negative error code on failure. Powering entities
523 * off is assumed to never fail. This function will not fail for disconnection
524 * events.
525 */
iss_pipeline_link_notify(struct media_link * link,u32 flags,unsigned int notification)526 static int iss_pipeline_link_notify(struct media_link *link, u32 flags,
527 unsigned int notification)
528 {
529 struct media_entity *source = link->source->entity;
530 struct media_entity *sink = link->sink->entity;
531 int source_use = iss_pipeline_pm_use_count(source);
532 int sink_use = iss_pipeline_pm_use_count(sink);
533 int ret;
534
535 if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
536 !(link->flags & MEDIA_LNK_FL_ENABLED)) {
537 /* Powering off entities is assumed to never fail. */
538 iss_pipeline_pm_power(source, -sink_use);
539 iss_pipeline_pm_power(sink, -source_use);
540 return 0;
541 }
542
543 if (notification == MEDIA_DEV_NOTIFY_POST_LINK_CH &&
544 (flags & MEDIA_LNK_FL_ENABLED)) {
545 ret = iss_pipeline_pm_power(source, sink_use);
546 if (ret < 0)
547 return ret;
548
549 ret = iss_pipeline_pm_power(sink, source_use);
550 if (ret < 0)
551 iss_pipeline_pm_power(source, -sink_use);
552
553 return ret;
554 }
555
556 return 0;
557 }
558
559 /* -----------------------------------------------------------------------------
560 * Pipeline stream management
561 */
562
563 /*
564 * iss_pipeline_disable - Disable streaming on a pipeline
565 * @pipe: ISS pipeline
566 * @until: entity at which to stop pipeline walk
567 *
568 * Walk the entities chain starting at the pipeline output video node and stop
569 * all modules in the chain. Wait synchronously for the modules to be stopped if
570 * necessary.
571 *
572 * If the until argument isn't NULL, stop the pipeline walk when reaching the
573 * until entity. This is used to disable a partially started pipeline due to a
574 * subdev start error.
575 */
iss_pipeline_disable(struct iss_pipeline * pipe,struct media_entity * until)576 static int iss_pipeline_disable(struct iss_pipeline *pipe,
577 struct media_entity *until)
578 {
579 struct iss_device *iss = pipe->output->iss;
580 struct media_entity *entity;
581 struct media_pad *pad;
582 struct v4l2_subdev *subdev;
583 int failure = 0;
584 int ret;
585
586 entity = &pipe->output->video.entity;
587 while (1) {
588 pad = &entity->pads[0];
589 if (!(pad->flags & MEDIA_PAD_FL_SINK))
590 break;
591
592 pad = media_entity_remote_pad(pad);
593 if (!pad ||
594 media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
595 break;
596
597 entity = pad->entity;
598 if (entity == until)
599 break;
600
601 subdev = media_entity_to_v4l2_subdev(entity);
602 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
603 if (ret < 0) {
604 dev_dbg(iss->dev, "%s: module stop timeout.\n",
605 subdev->name);
606 /* If the entity failed to stopped, assume it has
607 * crashed. Mark it as such, the ISS will be reset when
608 * applications will release it.
609 */
610 iss->crashed |= 1U << subdev->entity.id;
611 failure = -ETIMEDOUT;
612 }
613 }
614
615 return failure;
616 }
617
618 /*
619 * iss_pipeline_enable - Enable streaming on a pipeline
620 * @pipe: ISS pipeline
621 * @mode: Stream mode (single shot or continuous)
622 *
623 * Walk the entities chain starting at the pipeline output video node and start
624 * all modules in the chain in the given mode.
625 *
626 * Return 0 if successful, or the return value of the failed video::s_stream
627 * operation otherwise.
628 */
iss_pipeline_enable(struct iss_pipeline * pipe,enum iss_pipeline_stream_state mode)629 static int iss_pipeline_enable(struct iss_pipeline *pipe,
630 enum iss_pipeline_stream_state mode)
631 {
632 struct iss_device *iss = pipe->output->iss;
633 struct media_entity *entity;
634 struct media_pad *pad;
635 struct v4l2_subdev *subdev;
636 unsigned long flags;
637 int ret;
638
639 /* If one of the entities in the pipeline has crashed it will not work
640 * properly. Refuse to start streaming in that case. This check must be
641 * performed before the loop below to avoid starting entities if the
642 * pipeline won't start anyway (those entities would then likely fail to
643 * stop, making the problem worse).
644 */
645 if (pipe->entities & iss->crashed)
646 return -EIO;
647
648 spin_lock_irqsave(&pipe->lock, flags);
649 pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
650 spin_unlock_irqrestore(&pipe->lock, flags);
651
652 pipe->do_propagation = false;
653
654 entity = &pipe->output->video.entity;
655 while (1) {
656 pad = &entity->pads[0];
657 if (!(pad->flags & MEDIA_PAD_FL_SINK))
658 break;
659
660 pad = media_entity_remote_pad(pad);
661 if (!pad ||
662 media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
663 break;
664
665 entity = pad->entity;
666 subdev = media_entity_to_v4l2_subdev(entity);
667
668 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
669 if (ret < 0 && ret != -ENOIOCTLCMD) {
670 iss_pipeline_disable(pipe, entity);
671 return ret;
672 }
673
674 if (subdev == &iss->csi2a.subdev ||
675 subdev == &iss->csi2b.subdev)
676 pipe->do_propagation = true;
677 }
678
679 iss_print_status(pipe->output->iss);
680 return 0;
681 }
682
683 /*
684 * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
685 * @pipe: ISS pipeline
686 * @state: Stream state (stopped, single shot or continuous)
687 *
688 * Set the pipeline to the given stream state. Pipelines can be started in
689 * single-shot or continuous mode.
690 *
691 * Return 0 if successful, or the return value of the failed video::s_stream
692 * operation otherwise. The pipeline state is not updated when the operation
693 * fails, except when stopping the pipeline.
694 */
omap4iss_pipeline_set_stream(struct iss_pipeline * pipe,enum iss_pipeline_stream_state state)695 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
696 enum iss_pipeline_stream_state state)
697 {
698 int ret;
699
700 if (state == ISS_PIPELINE_STREAM_STOPPED)
701 ret = iss_pipeline_disable(pipe, NULL);
702 else
703 ret = iss_pipeline_enable(pipe, state);
704
705 if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
706 pipe->stream_state = state;
707
708 return ret;
709 }
710
711 /*
712 * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
713 * @pipe: ISS pipeline
714 *
715 * Cancelling a stream mark all buffers on all video nodes in the pipeline as
716 * erroneous and makes sure no new buffer can be queued. This function is called
717 * when a fatal error that prevents any further operation on the pipeline
718 * occurs.
719 */
omap4iss_pipeline_cancel_stream(struct iss_pipeline * pipe)720 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
721 {
722 if (pipe->input)
723 omap4iss_video_cancel_stream(pipe->input);
724 if (pipe->output)
725 omap4iss_video_cancel_stream(pipe->output);
726 }
727
728 /*
729 * iss_pipeline_is_last - Verify if entity has an enabled link to the output
730 * video node
731 * @me: ISS module's media entity
732 *
733 * Returns 1 if the entity has an enabled link to the output video node or 0
734 * otherwise. It's true only while pipeline can have no more than one output
735 * node.
736 */
iss_pipeline_is_last(struct media_entity * me)737 static int iss_pipeline_is_last(struct media_entity *me)
738 {
739 struct iss_pipeline *pipe;
740 struct media_pad *pad;
741
742 if (!me->pipe)
743 return 0;
744 pipe = to_iss_pipeline(me);
745 if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
746 return 0;
747 pad = media_entity_remote_pad(&pipe->output->pad);
748 return pad->entity == me;
749 }
750
iss_reset(struct iss_device * iss)751 static int iss_reset(struct iss_device *iss)
752 {
753 unsigned int timeout;
754
755 iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
756 ISS_HL_SYSCONFIG_SOFTRESET);
757
758 timeout = iss_poll_condition_timeout(
759 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
760 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
761 if (timeout) {
762 dev_err(iss->dev, "ISS reset timeout\n");
763 return -ETIMEDOUT;
764 }
765
766 iss->crashed = 0;
767 return 0;
768 }
769
iss_isp_reset(struct iss_device * iss)770 static int iss_isp_reset(struct iss_device *iss)
771 {
772 unsigned int timeout;
773
774 /* Fist, ensure that the ISP is IDLE (no transactions happening) */
775 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
776 ISP5_SYSCONFIG_STANDBYMODE_MASK,
777 ISP5_SYSCONFIG_STANDBYMODE_SMART);
778
779 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
780
781 timeout = iss_poll_condition_timeout(
782 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
783 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
784 if (timeout) {
785 dev_err(iss->dev, "ISP5 standby timeout\n");
786 return -ETIMEDOUT;
787 }
788
789 /* Now finally, do the reset */
790 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
791 ISP5_SYSCONFIG_SOFTRESET);
792
793 timeout = iss_poll_condition_timeout(
794 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
795 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
796 if (timeout) {
797 dev_err(iss->dev, "ISP5 reset timeout\n");
798 return -ETIMEDOUT;
799 }
800
801 return 0;
802 }
803
804 /*
805 * iss_module_sync_idle - Helper to sync module with its idle state
806 * @me: ISS submodule's media entity
807 * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
808 * @stopping: flag which tells module wants to stop
809 *
810 * This function checks if ISS submodule needs to wait for next interrupt. If
811 * yes, makes the caller to sleep while waiting for such event.
812 */
omap4iss_module_sync_idle(struct media_entity * me,wait_queue_head_t * wait,atomic_t * stopping)813 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
814 atomic_t *stopping)
815 {
816 struct iss_pipeline *pipe = to_iss_pipeline(me);
817 struct iss_video *video = pipe->output;
818 unsigned long flags;
819
820 if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
821 (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
822 !iss_pipeline_ready(pipe)))
823 return 0;
824
825 /*
826 * atomic_set() doesn't include memory barrier on ARM platform for SMP
827 * scenario. We'll call it here to avoid race conditions.
828 */
829 atomic_set(stopping, 1);
830 smp_wmb();
831
832 /*
833 * If module is the last one, it's writing to memory. In this case,
834 * it's necessary to check if the module is already paused due to
835 * DMA queue underrun or if it has to wait for next interrupt to be
836 * idle.
837 * If it isn't the last one, the function won't sleep but *stopping
838 * will still be set to warn next submodule caller's interrupt the
839 * module wants to be idle.
840 */
841 if (!iss_pipeline_is_last(me))
842 return 0;
843
844 spin_lock_irqsave(&video->qlock, flags);
845 if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
846 spin_unlock_irqrestore(&video->qlock, flags);
847 atomic_set(stopping, 0);
848 smp_wmb();
849 return 0;
850 }
851 spin_unlock_irqrestore(&video->qlock, flags);
852 if (!wait_event_timeout(*wait, !atomic_read(stopping),
853 msecs_to_jiffies(1000))) {
854 atomic_set(stopping, 0);
855 smp_wmb();
856 return -ETIMEDOUT;
857 }
858
859 return 0;
860 }
861
862 /*
863 * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
864 * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
865 * @stopping: flag which tells module wants to stop
866 *
867 * This function checks if ISS submodule was stopping. In case of yes, it
868 * notices the caller by setting stopping to 0 and waking up the wait queue.
869 * Returns 1 if it was stopping or 0 otherwise.
870 */
omap4iss_module_sync_is_stopping(wait_queue_head_t * wait,atomic_t * stopping)871 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
872 atomic_t *stopping)
873 {
874 if (atomic_cmpxchg(stopping, 1, 0)) {
875 wake_up(wait);
876 return 1;
877 }
878
879 return 0;
880 }
881
882 /* --------------------------------------------------------------------------
883 * Clock management
884 */
885
886 #define ISS_CLKCTRL_MASK (ISS_CLKCTRL_CSI2_A |\
887 ISS_CLKCTRL_CSI2_B |\
888 ISS_CLKCTRL_ISP)
889
__iss_subclk_update(struct iss_device * iss)890 static int __iss_subclk_update(struct iss_device *iss)
891 {
892 u32 clk = 0;
893 int ret = 0, timeout = 1000;
894
895 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
896 clk |= ISS_CLKCTRL_CSI2_A;
897
898 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
899 clk |= ISS_CLKCTRL_CSI2_B;
900
901 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
902 clk |= ISS_CLKCTRL_ISP;
903
904 iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
905 ISS_CLKCTRL_MASK, clk);
906
907 /* Wait for HW assertion */
908 while (--timeout > 0) {
909 udelay(1);
910 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
911 ISS_CLKCTRL_MASK) == clk)
912 break;
913 }
914
915 if (!timeout)
916 ret = -EBUSY;
917
918 return ret;
919 }
920
omap4iss_subclk_enable(struct iss_device * iss,enum iss_subclk_resource res)921 int omap4iss_subclk_enable(struct iss_device *iss,
922 enum iss_subclk_resource res)
923 {
924 iss->subclk_resources |= res;
925
926 return __iss_subclk_update(iss);
927 }
928
omap4iss_subclk_disable(struct iss_device * iss,enum iss_subclk_resource res)929 int omap4iss_subclk_disable(struct iss_device *iss,
930 enum iss_subclk_resource res)
931 {
932 iss->subclk_resources &= ~res;
933
934 return __iss_subclk_update(iss);
935 }
936
937 #define ISS_ISP5_CLKCTRL_MASK (ISP5_CTRL_BL_CLK_ENABLE |\
938 ISP5_CTRL_ISIF_CLK_ENABLE |\
939 ISP5_CTRL_H3A_CLK_ENABLE |\
940 ISP5_CTRL_RSZ_CLK_ENABLE |\
941 ISP5_CTRL_IPIPE_CLK_ENABLE |\
942 ISP5_CTRL_IPIPEIF_CLK_ENABLE)
943
__iss_isp_subclk_update(struct iss_device * iss)944 static void __iss_isp_subclk_update(struct iss_device *iss)
945 {
946 u32 clk = 0;
947
948 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
949 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
950
951 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
952 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
953
954 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
955 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
956
957 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
958 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
959
960 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
961 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
962
963 if (clk)
964 clk |= ISP5_CTRL_BL_CLK_ENABLE;
965
966 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
967 ISS_ISP5_CLKCTRL_MASK, clk);
968 }
969
omap4iss_isp_subclk_enable(struct iss_device * iss,enum iss_isp_subclk_resource res)970 void omap4iss_isp_subclk_enable(struct iss_device *iss,
971 enum iss_isp_subclk_resource res)
972 {
973 iss->isp_subclk_resources |= res;
974
975 __iss_isp_subclk_update(iss);
976 }
977
omap4iss_isp_subclk_disable(struct iss_device * iss,enum iss_isp_subclk_resource res)978 void omap4iss_isp_subclk_disable(struct iss_device *iss,
979 enum iss_isp_subclk_resource res)
980 {
981 iss->isp_subclk_resources &= ~res;
982
983 __iss_isp_subclk_update(iss);
984 }
985
986 /*
987 * iss_enable_clocks - Enable ISS clocks
988 * @iss: OMAP4 ISS device
989 *
990 * Return 0 if successful, or clk_enable return value if any of tthem fails.
991 */
iss_enable_clocks(struct iss_device * iss)992 static int iss_enable_clocks(struct iss_device *iss)
993 {
994 int ret;
995
996 ret = clk_enable(iss->iss_fck);
997 if (ret) {
998 dev_err(iss->dev, "clk_enable iss_fck failed\n");
999 return ret;
1000 }
1001
1002 ret = clk_enable(iss->iss_ctrlclk);
1003 if (ret) {
1004 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
1005 clk_disable(iss->iss_fck);
1006 return ret;
1007 }
1008
1009 return 0;
1010 }
1011
1012 /*
1013 * iss_disable_clocks - Disable ISS clocks
1014 * @iss: OMAP4 ISS device
1015 */
iss_disable_clocks(struct iss_device * iss)1016 static void iss_disable_clocks(struct iss_device *iss)
1017 {
1018 clk_disable(iss->iss_ctrlclk);
1019 clk_disable(iss->iss_fck);
1020 }
1021
iss_get_clocks(struct iss_device * iss)1022 static int iss_get_clocks(struct iss_device *iss)
1023 {
1024 iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
1025 if (IS_ERR(iss->iss_fck)) {
1026 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
1027 return PTR_ERR(iss->iss_fck);
1028 }
1029
1030 iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
1031 if (IS_ERR(iss->iss_ctrlclk)) {
1032 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
1033 return PTR_ERR(iss->iss_ctrlclk);
1034 }
1035
1036 return 0;
1037 }
1038
1039 /*
1040 * omap4iss_get - Acquire the ISS resource.
1041 *
1042 * Initializes the clocks for the first acquire.
1043 *
1044 * Increment the reference count on the ISS. If the first reference is taken,
1045 * enable clocks and power-up all submodules.
1046 *
1047 * Return a pointer to the ISS device structure, or NULL if an error occurred.
1048 */
omap4iss_get(struct iss_device * iss)1049 struct iss_device *omap4iss_get(struct iss_device *iss)
1050 {
1051 struct iss_device *__iss = iss;
1052
1053 if (!iss)
1054 return NULL;
1055
1056 mutex_lock(&iss->iss_mutex);
1057 if (iss->ref_count > 0)
1058 goto out;
1059
1060 if (iss_enable_clocks(iss) < 0) {
1061 __iss = NULL;
1062 goto out;
1063 }
1064
1065 iss_enable_interrupts(iss);
1066
1067 out:
1068 if (__iss)
1069 iss->ref_count++;
1070 mutex_unlock(&iss->iss_mutex);
1071
1072 return __iss;
1073 }
1074
1075 /*
1076 * omap4iss_put - Release the ISS
1077 *
1078 * Decrement the reference count on the ISS. If the last reference is released,
1079 * power-down all submodules, disable clocks and free temporary buffers.
1080 */
omap4iss_put(struct iss_device * iss)1081 void omap4iss_put(struct iss_device *iss)
1082 {
1083 if (!iss)
1084 return;
1085
1086 mutex_lock(&iss->iss_mutex);
1087 BUG_ON(iss->ref_count == 0);
1088 if (--iss->ref_count == 0) {
1089 iss_disable_interrupts(iss);
1090 /* Reset the ISS if an entity has failed to stop. This is the
1091 * only way to recover from such conditions, although it would
1092 * be worth investigating whether resetting the ISP only can't
1093 * fix the problem in some cases.
1094 */
1095 if (iss->crashed)
1096 iss_reset(iss);
1097 iss_disable_clocks(iss);
1098 }
1099 mutex_unlock(&iss->iss_mutex);
1100 }
1101
iss_map_mem_resource(struct platform_device * pdev,struct iss_device * iss,enum iss_mem_resources res)1102 static int iss_map_mem_resource(struct platform_device *pdev,
1103 struct iss_device *iss,
1104 enum iss_mem_resources res)
1105 {
1106 struct resource *mem;
1107
1108 mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
1109
1110 iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
1111
1112 return PTR_ERR_OR_ZERO(iss->regs[res]);
1113 }
1114
iss_unregister_entities(struct iss_device * iss)1115 static void iss_unregister_entities(struct iss_device *iss)
1116 {
1117 omap4iss_resizer_unregister_entities(&iss->resizer);
1118 omap4iss_ipipe_unregister_entities(&iss->ipipe);
1119 omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
1120 omap4iss_csi2_unregister_entities(&iss->csi2a);
1121 omap4iss_csi2_unregister_entities(&iss->csi2b);
1122
1123 v4l2_device_unregister(&iss->v4l2_dev);
1124 media_device_unregister(&iss->media_dev);
1125 }
1126
1127 /*
1128 * iss_register_subdev_group - Register a group of subdevices
1129 * @iss: OMAP4 ISS device
1130 * @board_info: I2C subdevs board information array
1131 *
1132 * Register all I2C subdevices in the board_info array. The array must be
1133 * terminated by a NULL entry, and the first entry must be the sensor.
1134 *
1135 * Return a pointer to the sensor media entity if it has been successfully
1136 * registered, or NULL otherwise.
1137 */
1138 static struct v4l2_subdev *
iss_register_subdev_group(struct iss_device * iss,struct iss_subdev_i2c_board_info * board_info)1139 iss_register_subdev_group(struct iss_device *iss,
1140 struct iss_subdev_i2c_board_info *board_info)
1141 {
1142 struct v4l2_subdev *sensor = NULL;
1143 unsigned int first;
1144
1145 if (!board_info->board_info)
1146 return NULL;
1147
1148 for (first = 1; board_info->board_info; ++board_info, first = 0) {
1149 struct v4l2_subdev *subdev;
1150 struct i2c_adapter *adapter;
1151
1152 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
1153 if (!adapter) {
1154 dev_err(iss->dev,
1155 "%s: Unable to get I2C adapter %d for device %s\n",
1156 __func__, board_info->i2c_adapter_id,
1157 board_info->board_info->type);
1158 continue;
1159 }
1160
1161 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
1162 board_info->board_info, NULL);
1163 if (!subdev) {
1164 dev_err(iss->dev, "Unable to register subdev %s\n",
1165 board_info->board_info->type);
1166 continue;
1167 }
1168
1169 if (first)
1170 sensor = subdev;
1171 }
1172
1173 return sensor;
1174 }
1175
iss_register_entities(struct iss_device * iss)1176 static int iss_register_entities(struct iss_device *iss)
1177 {
1178 struct iss_platform_data *pdata = iss->pdata;
1179 struct iss_v4l2_subdevs_group *subdevs;
1180 int ret;
1181
1182 iss->media_dev.dev = iss->dev;
1183 strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
1184 sizeof(iss->media_dev.model));
1185 iss->media_dev.hw_revision = iss->revision;
1186 iss->media_dev.link_notify = iss_pipeline_link_notify;
1187 ret = media_device_register(&iss->media_dev);
1188 if (ret < 0) {
1189 dev_err(iss->dev, "Media device registration failed (%d)\n",
1190 ret);
1191 return ret;
1192 }
1193
1194 iss->v4l2_dev.mdev = &iss->media_dev;
1195 ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1196 if (ret < 0) {
1197 dev_err(iss->dev, "V4L2 device registration failed (%d)\n",
1198 ret);
1199 goto done;
1200 }
1201
1202 /* Register internal entities */
1203 ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1204 if (ret < 0)
1205 goto done;
1206
1207 ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1208 if (ret < 0)
1209 goto done;
1210
1211 ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1212 if (ret < 0)
1213 goto done;
1214
1215 ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1216 if (ret < 0)
1217 goto done;
1218
1219 ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1220 if (ret < 0)
1221 goto done;
1222
1223 /* Register external entities */
1224 for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1225 struct v4l2_subdev *sensor;
1226 struct media_entity *input;
1227 unsigned int flags;
1228 unsigned int pad;
1229
1230 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1231 if (!sensor)
1232 continue;
1233
1234 sensor->host_priv = subdevs;
1235
1236 /* Connect the sensor to the correct interface module.
1237 * CSI2a receiver through CSIPHY1, or
1238 * CSI2b receiver through CSIPHY2
1239 */
1240 switch (subdevs->interface) {
1241 case ISS_INTERFACE_CSI2A_PHY1:
1242 input = &iss->csi2a.subdev.entity;
1243 pad = CSI2_PAD_SINK;
1244 flags = MEDIA_LNK_FL_IMMUTABLE
1245 | MEDIA_LNK_FL_ENABLED;
1246 break;
1247
1248 case ISS_INTERFACE_CSI2B_PHY2:
1249 input = &iss->csi2b.subdev.entity;
1250 pad = CSI2_PAD_SINK;
1251 flags = MEDIA_LNK_FL_IMMUTABLE
1252 | MEDIA_LNK_FL_ENABLED;
1253 break;
1254
1255 default:
1256 dev_err(iss->dev, "invalid interface type %u\n",
1257 subdevs->interface);
1258 ret = -EINVAL;
1259 goto done;
1260 }
1261
1262 ret = media_entity_create_link(&sensor->entity, 0, input, pad,
1263 flags);
1264 if (ret < 0)
1265 goto done;
1266 }
1267
1268 ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1269
1270 done:
1271 if (ret < 0)
1272 iss_unregister_entities(iss);
1273
1274 return ret;
1275 }
1276
iss_cleanup_modules(struct iss_device * iss)1277 static void iss_cleanup_modules(struct iss_device *iss)
1278 {
1279 omap4iss_csi2_cleanup(iss);
1280 omap4iss_ipipeif_cleanup(iss);
1281 omap4iss_ipipe_cleanup(iss);
1282 omap4iss_resizer_cleanup(iss);
1283 }
1284
iss_initialize_modules(struct iss_device * iss)1285 static int iss_initialize_modules(struct iss_device *iss)
1286 {
1287 int ret;
1288
1289 ret = omap4iss_csiphy_init(iss);
1290 if (ret < 0) {
1291 dev_err(iss->dev, "CSI PHY initialization failed\n");
1292 goto error_csiphy;
1293 }
1294
1295 ret = omap4iss_csi2_init(iss);
1296 if (ret < 0) {
1297 dev_err(iss->dev, "CSI2 initialization failed\n");
1298 goto error_csi2;
1299 }
1300
1301 ret = omap4iss_ipipeif_init(iss);
1302 if (ret < 0) {
1303 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1304 goto error_ipipeif;
1305 }
1306
1307 ret = omap4iss_ipipe_init(iss);
1308 if (ret < 0) {
1309 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1310 goto error_ipipe;
1311 }
1312
1313 ret = omap4iss_resizer_init(iss);
1314 if (ret < 0) {
1315 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1316 goto error_resizer;
1317 }
1318
1319 /* Connect the submodules. */
1320 ret = media_entity_create_link(
1321 &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1322 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1323 if (ret < 0)
1324 goto error_link;
1325
1326 ret = media_entity_create_link(
1327 &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1328 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1329 if (ret < 0)
1330 goto error_link;
1331
1332 ret = media_entity_create_link(
1333 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1334 &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1335 if (ret < 0)
1336 goto error_link;
1337
1338 ret = media_entity_create_link(
1339 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1340 &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1341 if (ret < 0)
1342 goto error_link;
1343
1344 ret = media_entity_create_link(
1345 &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1346 &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1347 if (ret < 0)
1348 goto error_link;
1349
1350 return 0;
1351
1352 error_link:
1353 omap4iss_resizer_cleanup(iss);
1354 error_resizer:
1355 omap4iss_ipipe_cleanup(iss);
1356 error_ipipe:
1357 omap4iss_ipipeif_cleanup(iss);
1358 error_ipipeif:
1359 omap4iss_csi2_cleanup(iss);
1360 error_csi2:
1361 error_csiphy:
1362 return ret;
1363 }
1364
iss_probe(struct platform_device * pdev)1365 static int iss_probe(struct platform_device *pdev)
1366 {
1367 struct iss_platform_data *pdata = pdev->dev.platform_data;
1368 struct iss_device *iss;
1369 unsigned int i;
1370 int ret;
1371
1372 if (!pdata)
1373 return -EINVAL;
1374
1375 iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1376 if (!iss)
1377 return -ENOMEM;
1378
1379 mutex_init(&iss->iss_mutex);
1380
1381 iss->dev = &pdev->dev;
1382 iss->pdata = pdata;
1383
1384 iss->raw_dmamask = DMA_BIT_MASK(32);
1385 iss->dev->dma_mask = &iss->raw_dmamask;
1386 iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1387
1388 platform_set_drvdata(pdev, iss);
1389
1390 /*
1391 * TODO: When implementing DT support switch to syscon regmap lookup by
1392 * phandle.
1393 */
1394 iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
1395 if (IS_ERR(iss->syscon)) {
1396 ret = PTR_ERR(iss->syscon);
1397 goto error;
1398 }
1399
1400 /* Clocks */
1401 ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1402 if (ret < 0)
1403 goto error;
1404
1405 ret = iss_get_clocks(iss);
1406 if (ret < 0)
1407 goto error;
1408
1409 if (!omap4iss_get(iss)) {
1410 ret = -EINVAL;
1411 goto error;
1412 }
1413
1414 ret = iss_reset(iss);
1415 if (ret < 0)
1416 goto error_iss;
1417
1418 iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1419 dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1420
1421 for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1422 ret = iss_map_mem_resource(pdev, iss, i);
1423 if (ret)
1424 goto error_iss;
1425 }
1426
1427 /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1428 iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1429 BTE_CTRL_BW_LIMITER_MASK,
1430 18 << BTE_CTRL_BW_LIMITER_SHIFT);
1431
1432 /* Perform ISP reset */
1433 ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1434 if (ret < 0)
1435 goto error_iss;
1436
1437 ret = iss_isp_reset(iss);
1438 if (ret < 0)
1439 goto error_iss;
1440
1441 dev_info(iss->dev, "ISP Revision %08x found\n",
1442 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1443
1444 /* Interrupt */
1445 ret = platform_get_irq(pdev, 0);
1446 if (ret <= 0) {
1447 dev_err(iss->dev, "No IRQ resource\n");
1448 ret = -ENODEV;
1449 goto error_iss;
1450 }
1451 iss->irq_num = ret;
1452
1453 if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1454 "OMAP4 ISS", iss)) {
1455 dev_err(iss->dev, "Unable to request IRQ\n");
1456 ret = -EINVAL;
1457 goto error_iss;
1458 }
1459
1460 /* Entities */
1461 ret = iss_initialize_modules(iss);
1462 if (ret < 0)
1463 goto error_iss;
1464
1465 ret = iss_register_entities(iss);
1466 if (ret < 0)
1467 goto error_modules;
1468
1469 omap4iss_put(iss);
1470
1471 return 0;
1472
1473 error_modules:
1474 iss_cleanup_modules(iss);
1475 error_iss:
1476 omap4iss_put(iss);
1477 error:
1478 platform_set_drvdata(pdev, NULL);
1479
1480 mutex_destroy(&iss->iss_mutex);
1481
1482 return ret;
1483 }
1484
iss_remove(struct platform_device * pdev)1485 static int iss_remove(struct platform_device *pdev)
1486 {
1487 struct iss_device *iss = platform_get_drvdata(pdev);
1488
1489 iss_unregister_entities(iss);
1490 iss_cleanup_modules(iss);
1491
1492 return 0;
1493 }
1494
1495 static const struct platform_device_id omap4iss_id_table[] = {
1496 { "omap4iss", 0 },
1497 { },
1498 };
1499 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1500
1501 static struct platform_driver iss_driver = {
1502 .probe = iss_probe,
1503 .remove = iss_remove,
1504 .id_table = omap4iss_id_table,
1505 .driver = {
1506 .name = "omap4iss",
1507 },
1508 };
1509
1510 module_platform_driver(iss_driver);
1511
1512 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1513 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1514 MODULE_LICENSE("GPL");
1515 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);
1516