1 // SPDX-License-Identifier: GPL-2.0+
3 * TI OMAP4 ISS V4L2 Driver
5 * Copyright (C) 2012, Texas Instruments
7 * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
10 #include <linux/clk.h>
11 #include <linux/delay.h>
12 #include <linux/device.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/i2c.h>
15 #include <linux/interrupt.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/module.h>
18 #include <linux/platform_device.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/vmalloc.h>
23 #include <media/v4l2-common.h>
24 #include <media/v4l2-device.h>
25 #include <media/v4l2-ctrls.h>
30 #define ISS_PRINT_REGISTER(iss, name)\
31 dev_dbg(iss->dev, "###ISS " #name "=0x%08x\n", \
32 iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_##name))
34 static void iss_print_status(struct iss_device *iss)
36 dev_dbg(iss->dev, "-------------ISS HL Register dump-------------\n");
38 ISS_PRINT_REGISTER(iss, HL_REVISION);
39 ISS_PRINT_REGISTER(iss, HL_SYSCONFIG);
40 ISS_PRINT_REGISTER(iss, HL_IRQSTATUS(5));
41 ISS_PRINT_REGISTER(iss, HL_IRQENABLE_SET(5));
42 ISS_PRINT_REGISTER(iss, HL_IRQENABLE_CLR(5));
43 ISS_PRINT_REGISTER(iss, CTRL);
44 ISS_PRINT_REGISTER(iss, CLKCTRL);
45 ISS_PRINT_REGISTER(iss, CLKSTAT);
47 dev_dbg(iss->dev, "-----------------------------------------------\n");
51 * omap4iss_flush - Post pending L3 bus writes by doing a register readback
52 * @iss: OMAP4 ISS device
54 * In order to force posting of pending writes, we need to write and
55 * readback the same register, in this case the revision register.
57 * See this link for reference:
58 * https://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
60 static void omap4iss_flush(struct iss_device *iss)
62 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION, 0);
63 iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
67 * iss_isp_enable_interrupts - Enable ISS ISP interrupts.
68 * @iss: OMAP4 ISS device
70 static void omap4iss_isp_enable_interrupts(struct iss_device *iss)
72 static const u32 isp_irq = ISP5_IRQ_OCP_ERR |
73 ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
74 ISP5_IRQ_RSZ_FIFO_OVF |
75 ISP5_IRQ_RSZ_INT_DMA |
78 /* Enable ISP interrupts */
79 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0), isp_irq);
80 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_SET(0),
85 * iss_isp_disable_interrupts - Disable ISS interrupts.
86 * @iss: OMAP4 ISS device
88 static void omap4iss_isp_disable_interrupts(struct iss_device *iss)
90 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_CLR(0), ~0);
94 * iss_enable_interrupts - Enable ISS interrupts.
95 * @iss: OMAP4 ISS device
97 static void iss_enable_interrupts(struct iss_device *iss)
99 static const u32 hl_irq = ISS_HL_IRQ_CSIA | ISS_HL_IRQ_CSIB
102 /* Enable HL interrupts */
103 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), hl_irq);
104 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_SET(5), hl_irq);
106 if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
107 omap4iss_isp_enable_interrupts(iss);
111 * iss_disable_interrupts - Disable ISS interrupts.
112 * @iss: OMAP4 ISS device
114 static void iss_disable_interrupts(struct iss_device *iss)
116 if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
117 omap4iss_isp_disable_interrupts(iss);
119 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_CLR(5), ~0);
122 int omap4iss_get_external_info(struct iss_pipeline *pipe,
123 struct media_link *link)
125 struct iss_device *iss =
126 container_of(pipe, struct iss_video, pipe)->iss;
127 struct v4l2_subdev_format fmt;
128 struct v4l2_ctrl *ctrl;
134 if (pipe->external_rate)
137 memset(&fmt, 0, sizeof(fmt));
139 fmt.pad = link->source->index;
140 fmt.which = V4L2_SUBDEV_FORMAT_ACTIVE;
141 ret = v4l2_subdev_call(media_entity_to_v4l2_subdev(link->sink->entity),
142 pad, get_fmt, NULL, &fmt);
146 pipe->external_bpp = omap4iss_video_format_info(fmt.format.code)->bpp;
148 ctrl = v4l2_ctrl_find(pipe->external->ctrl_handler,
149 V4L2_CID_PIXEL_RATE);
151 dev_warn(iss->dev, "no pixel rate control in subdev %s\n",
152 pipe->external->name);
156 pipe->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
162 * Configure the bridge. Valid inputs are
164 * IPIPEIF_INPUT_CSI2A: CSI2a receiver
165 * IPIPEIF_INPUT_CSI2B: CSI2b receiver
167 * The bridge and lane shifter are configured according to the selected input
168 * and the ISP platform data.
170 void omap4iss_configure_bridge(struct iss_device *iss,
171 enum ipipeif_input_entity input)
176 issctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL);
177 issctrl_val &= ~ISS_CTRL_INPUT_SEL_MASK;
178 issctrl_val &= ~ISS_CTRL_CLK_DIV_MASK;
180 isp5ctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL);
183 case IPIPEIF_INPUT_CSI2A:
184 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2A;
187 case IPIPEIF_INPUT_CSI2B:
188 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2B;
195 issctrl_val |= ISS_CTRL_SYNC_DETECT_VS_RAISING;
197 isp5ctrl_val |= ISP5_CTRL_VD_PULSE_EXT | ISP5_CTRL_PSYNC_CLK_SEL |
198 ISP5_CTRL_SYNC_ENABLE;
200 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_CTRL, issctrl_val);
201 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, isp5ctrl_val);
205 static void iss_isr_dbg(struct iss_device *iss, u32 irqstatus)
207 static const char * const name[] = {
243 dev_dbg(iss->dev, "ISS IRQ: ");
245 for (i = 0; i < ARRAY_SIZE(name); i++) {
246 if ((1 << i) & irqstatus)
247 pr_cont("%s ", name[i]);
252 static void iss_isp_isr_dbg(struct iss_device *iss, u32 irqstatus)
254 static const char * const name[] = {
274 "RSZ_FIFO_IN_BLK_ERR",
290 dev_dbg(iss->dev, "ISP IRQ: ");
292 for (i = 0; i < ARRAY_SIZE(name); i++) {
293 if ((1 << i) & irqstatus)
294 pr_cont("%s ", name[i]);
301 * iss_isr - Interrupt Service Routine for ISS module.
302 * @irq: Not used currently.
303 * @_iss: Pointer to the OMAP4 ISS device
305 * Handles the corresponding callback if plugged in.
307 * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
308 * IRQ wasn't handled.
310 static irqreturn_t iss_isr(int irq, void *_iss)
312 static const u32 ipipeif_events = ISP5_IRQ_IPIPEIF_IRQ |
313 ISP5_IRQ_ISIF_INT(0);
314 static const u32 resizer_events = ISP5_IRQ_RSZ_FIFO_IN_BLK_ERR |
315 ISP5_IRQ_RSZ_FIFO_OVF |
316 ISP5_IRQ_RSZ_INT_DMA;
317 struct iss_device *iss = _iss;
320 irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5));
321 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQSTATUS(5), irqstatus);
323 if (irqstatus & ISS_HL_IRQ_CSIA)
324 omap4iss_csi2_isr(&iss->csi2a);
326 if (irqstatus & ISS_HL_IRQ_CSIB)
327 omap4iss_csi2_isr(&iss->csi2b);
329 if (irqstatus & ISS_HL_IRQ_ISP(0)) {
330 u32 isp_irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
332 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0),
335 if (isp_irqstatus & ISP5_IRQ_OCP_ERR)
336 dev_dbg(iss->dev, "ISP5 OCP Error!\n");
338 if (isp_irqstatus & ipipeif_events) {
339 omap4iss_ipipeif_isr(&iss->ipipeif,
340 isp_irqstatus & ipipeif_events);
343 if (isp_irqstatus & resizer_events)
344 omap4iss_resizer_isr(&iss->resizer,
345 isp_irqstatus & resizer_events);
348 iss_isp_isr_dbg(iss, isp_irqstatus);
355 iss_isr_dbg(iss, irqstatus);
361 static const struct media_device_ops iss_media_ops = {
362 .link_notify = v4l2_pipeline_link_notify,
365 /* -----------------------------------------------------------------------------
366 * Pipeline stream management
370 * iss_pipeline_disable - Disable streaming on a pipeline
371 * @pipe: ISS pipeline
372 * @until: entity at which to stop pipeline walk
374 * Walk the entities chain starting at the pipeline output video node and stop
375 * all modules in the chain. Wait synchronously for the modules to be stopped if
378 * If the until argument isn't NULL, stop the pipeline walk when reaching the
379 * until entity. This is used to disable a partially started pipeline due to a
380 * subdev start error.
382 static int iss_pipeline_disable(struct iss_pipeline *pipe,
383 struct media_entity *until)
385 struct iss_device *iss = pipe->output->iss;
386 struct media_entity *entity;
387 struct media_pad *pad;
388 struct v4l2_subdev *subdev;
392 entity = &pipe->output->video.entity;
394 pad = &entity->pads[0];
395 if (!(pad->flags & MEDIA_PAD_FL_SINK))
398 pad = media_pad_remote_pad_first(pad);
399 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
402 entity = pad->entity;
406 subdev = media_entity_to_v4l2_subdev(entity);
407 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
409 dev_warn(iss->dev, "%s: module stop timeout.\n",
411 /* If the entity failed to stopped, assume it has
412 * crashed. Mark it as such, the ISS will be reset when
413 * applications will release it.
415 media_entity_enum_set(&iss->crashed, &subdev->entity);
416 failure = -ETIMEDOUT;
424 * iss_pipeline_enable - Enable streaming on a pipeline
425 * @pipe: ISS pipeline
426 * @mode: Stream mode (single shot or continuous)
428 * Walk the entities chain starting at the pipeline output video node and start
429 * all modules in the chain in the given mode.
431 * Return 0 if successful, or the return value of the failed video::s_stream
432 * operation otherwise.
434 static int iss_pipeline_enable(struct iss_pipeline *pipe,
435 enum iss_pipeline_stream_state mode)
437 struct iss_device *iss = pipe->output->iss;
438 struct media_entity *entity;
439 struct media_pad *pad;
440 struct v4l2_subdev *subdev;
444 /* If one of the entities in the pipeline has crashed it will not work
445 * properly. Refuse to start streaming in that case. This check must be
446 * performed before the loop below to avoid starting entities if the
447 * pipeline won't start anyway (those entities would then likely fail to
448 * stop, making the problem worse).
450 if (media_entity_enum_intersects(&pipe->ent_enum, &iss->crashed))
453 spin_lock_irqsave(&pipe->lock, flags);
454 pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
455 spin_unlock_irqrestore(&pipe->lock, flags);
457 pipe->do_propagation = false;
459 mutex_lock(&iss->media_dev.graph_mutex);
461 entity = &pipe->output->video.entity;
463 pad = &entity->pads[0];
464 if (!(pad->flags & MEDIA_PAD_FL_SINK))
467 pad = media_pad_remote_pad_first(pad);
468 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
471 entity = pad->entity;
472 subdev = media_entity_to_v4l2_subdev(entity);
474 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
475 if (ret < 0 && ret != -ENOIOCTLCMD) {
476 iss_pipeline_disable(pipe, entity);
477 mutex_unlock(&iss->media_dev.graph_mutex);
481 if (subdev == &iss->csi2a.subdev ||
482 subdev == &iss->csi2b.subdev)
483 pipe->do_propagation = true;
486 mutex_unlock(&iss->media_dev.graph_mutex);
487 iss_print_status(pipe->output->iss);
493 * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
494 * @pipe: ISS pipeline
495 * @state: Stream state (stopped, single shot or continuous)
497 * Set the pipeline to the given stream state. Pipelines can be started in
498 * single-shot or continuous mode.
500 * Return 0 if successful, or the return value of the failed video::s_stream
501 * operation otherwise. The pipeline state is not updated when the operation
502 * fails, except when stopping the pipeline.
504 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
505 enum iss_pipeline_stream_state state)
509 if (state == ISS_PIPELINE_STREAM_STOPPED)
510 ret = iss_pipeline_disable(pipe, NULL);
512 ret = iss_pipeline_enable(pipe, state);
514 if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
515 pipe->stream_state = state;
521 * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
522 * @pipe: ISS pipeline
524 * Cancelling a stream mark all buffers on all video nodes in the pipeline as
525 * erroneous and makes sure no new buffer can be queued. This function is called
526 * when a fatal error that prevents any further operation on the pipeline
529 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
532 omap4iss_video_cancel_stream(pipe->input);
534 omap4iss_video_cancel_stream(pipe->output);
538 * iss_pipeline_is_last - Verify if entity has an enabled link to the output
540 * @me: ISS module's media entity
542 * Returns 1 if the entity has an enabled link to the output video node or 0
543 * otherwise. It's true only while pipeline can have no more than one output
546 static int iss_pipeline_is_last(struct media_entity *me)
548 struct iss_pipeline *pipe;
549 struct media_pad *pad;
551 pipe = to_iss_pipeline(me);
552 if (!pipe || pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
554 pad = media_pad_remote_pad_first(&pipe->output->pad);
555 return pad->entity == me;
558 static int iss_reset(struct iss_device *iss)
560 unsigned int timeout;
562 iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
563 ISS_HL_SYSCONFIG_SOFTRESET);
565 timeout = iss_poll_condition_timeout(
566 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
567 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
569 dev_err(iss->dev, "ISS reset timeout\n");
573 media_entity_enum_zero(&iss->crashed);
578 static int iss_isp_reset(struct iss_device *iss)
580 unsigned int timeout;
582 /* Fist, ensure that the ISP is IDLE (no transactions happening) */
583 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
584 ISP5_SYSCONFIG_STANDBYMODE_MASK,
585 ISP5_SYSCONFIG_STANDBYMODE_SMART);
587 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
589 timeout = iss_poll_condition_timeout(
590 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
591 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
593 dev_err(iss->dev, "ISP5 standby timeout\n");
597 /* Now finally, do the reset */
598 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
599 ISP5_SYSCONFIG_SOFTRESET);
601 timeout = iss_poll_condition_timeout(
602 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
603 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
605 dev_err(iss->dev, "ISP5 reset timeout\n");
613 * iss_module_sync_idle - Helper to sync module with its idle state
614 * @me: ISS submodule's media entity
615 * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
616 * @stopping: flag which tells module wants to stop
618 * This function checks if ISS submodule needs to wait for next interrupt. If
619 * yes, makes the caller to sleep while waiting for such event.
621 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
624 struct iss_pipeline *pipe = to_iss_pipeline(me);
625 struct iss_video *video = pipe->output;
628 if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
629 (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
630 !iss_pipeline_ready(pipe)))
634 * atomic_set() doesn't include memory barrier on ARM platform for SMP
635 * scenario. We'll call it here to avoid race conditions.
637 atomic_set(stopping, 1);
641 * If module is the last one, it's writing to memory. In this case,
642 * it's necessary to check if the module is already paused due to
643 * DMA queue underrun or if it has to wait for next interrupt to be
645 * If it isn't the last one, the function won't sleep but *stopping
646 * will still be set to warn next submodule caller's interrupt the
647 * module wants to be idle.
649 if (!iss_pipeline_is_last(me))
652 spin_lock_irqsave(&video->qlock, flags);
653 if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
654 spin_unlock_irqrestore(&video->qlock, flags);
655 atomic_set(stopping, 0);
659 spin_unlock_irqrestore(&video->qlock, flags);
660 if (!wait_event_timeout(*wait, !atomic_read(stopping),
661 msecs_to_jiffies(1000))) {
662 atomic_set(stopping, 0);
671 * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
672 * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
673 * @stopping: flag which tells module wants to stop
675 * This function checks if ISS submodule was stopping. In case of yes, it
676 * notices the caller by setting stopping to 0 and waking up the wait queue.
677 * Returns 1 if it was stopping or 0 otherwise.
679 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
682 if (atomic_cmpxchg(stopping, 1, 0)) {
690 /* --------------------------------------------------------------------------
694 #define ISS_CLKCTRL_MASK (ISS_CLKCTRL_CSI2_A |\
695 ISS_CLKCTRL_CSI2_B |\
698 static int __iss_subclk_update(struct iss_device *iss)
701 int ret = 0, timeout = 1000;
703 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
704 clk |= ISS_CLKCTRL_CSI2_A;
706 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
707 clk |= ISS_CLKCTRL_CSI2_B;
709 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
710 clk |= ISS_CLKCTRL_ISP;
712 iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
713 ISS_CLKCTRL_MASK, clk);
715 /* Wait for HW assertion */
716 while (--timeout > 0) {
718 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
719 ISS_CLKCTRL_MASK) == clk)
729 int omap4iss_subclk_enable(struct iss_device *iss,
730 enum iss_subclk_resource res)
732 iss->subclk_resources |= res;
734 return __iss_subclk_update(iss);
737 int omap4iss_subclk_disable(struct iss_device *iss,
738 enum iss_subclk_resource res)
740 iss->subclk_resources &= ~res;
742 return __iss_subclk_update(iss);
745 #define ISS_ISP5_CLKCTRL_MASK (ISP5_CTRL_BL_CLK_ENABLE |\
746 ISP5_CTRL_ISIF_CLK_ENABLE |\
747 ISP5_CTRL_H3A_CLK_ENABLE |\
748 ISP5_CTRL_RSZ_CLK_ENABLE |\
749 ISP5_CTRL_IPIPE_CLK_ENABLE |\
750 ISP5_CTRL_IPIPEIF_CLK_ENABLE)
752 static void __iss_isp_subclk_update(struct iss_device *iss)
756 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
757 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
759 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
760 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
762 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
763 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
765 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
766 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
768 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
769 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
772 clk |= ISP5_CTRL_BL_CLK_ENABLE;
774 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
775 ISS_ISP5_CLKCTRL_MASK, clk);
778 void omap4iss_isp_subclk_enable(struct iss_device *iss,
779 enum iss_isp_subclk_resource res)
781 iss->isp_subclk_resources |= res;
783 __iss_isp_subclk_update(iss);
786 void omap4iss_isp_subclk_disable(struct iss_device *iss,
787 enum iss_isp_subclk_resource res)
789 iss->isp_subclk_resources &= ~res;
791 __iss_isp_subclk_update(iss);
795 * iss_enable_clocks - Enable ISS clocks
796 * @iss: OMAP4 ISS device
798 * Return 0 if successful, or clk_enable return value if any of tthem fails.
800 static int iss_enable_clocks(struct iss_device *iss)
804 ret = clk_enable(iss->iss_fck);
806 dev_err(iss->dev, "clk_enable iss_fck failed\n");
810 ret = clk_enable(iss->iss_ctrlclk);
812 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
813 clk_disable(iss->iss_fck);
821 * iss_disable_clocks - Disable ISS clocks
822 * @iss: OMAP4 ISS device
824 static void iss_disable_clocks(struct iss_device *iss)
826 clk_disable(iss->iss_ctrlclk);
827 clk_disable(iss->iss_fck);
830 static int iss_get_clocks(struct iss_device *iss)
832 iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
833 if (IS_ERR(iss->iss_fck)) {
834 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
835 return PTR_ERR(iss->iss_fck);
838 iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
839 if (IS_ERR(iss->iss_ctrlclk)) {
840 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
841 return PTR_ERR(iss->iss_ctrlclk);
848 * omap4iss_get - Acquire the ISS resource.
850 * Initializes the clocks for the first acquire.
852 * Increment the reference count on the ISS. If the first reference is taken,
853 * enable clocks and power-up all submodules.
855 * Return a pointer to the ISS device structure, or NULL if an error occurred.
857 struct iss_device *omap4iss_get(struct iss_device *iss)
859 struct iss_device *__iss = iss;
864 mutex_lock(&iss->iss_mutex);
865 if (iss->ref_count > 0)
868 if (iss_enable_clocks(iss) < 0) {
873 iss_enable_interrupts(iss);
878 mutex_unlock(&iss->iss_mutex);
884 * omap4iss_put - Release the ISS
886 * Decrement the reference count on the ISS. If the last reference is released,
887 * power-down all submodules, disable clocks and free temporary buffers.
889 void omap4iss_put(struct iss_device *iss)
894 mutex_lock(&iss->iss_mutex);
895 WARN_ON(iss->ref_count == 0);
896 if (--iss->ref_count == 0) {
897 iss_disable_interrupts(iss);
898 /* Reset the ISS if an entity has failed to stop. This is the
899 * only way to recover from such conditions, although it would
900 * be worth investigating whether resetting the ISP only can't
901 * fix the problem in some cases.
903 if (!media_entity_enum_empty(&iss->crashed))
905 iss_disable_clocks(iss);
907 mutex_unlock(&iss->iss_mutex);
910 static int iss_map_mem_resource(struct platform_device *pdev,
911 struct iss_device *iss,
912 enum iss_mem_resources res)
914 iss->regs[res] = devm_platform_ioremap_resource(pdev, res);
916 return PTR_ERR_OR_ZERO(iss->regs[res]);
919 static void iss_unregister_entities(struct iss_device *iss)
921 omap4iss_resizer_unregister_entities(&iss->resizer);
922 omap4iss_ipipe_unregister_entities(&iss->ipipe);
923 omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
924 omap4iss_csi2_unregister_entities(&iss->csi2a);
925 omap4iss_csi2_unregister_entities(&iss->csi2b);
927 v4l2_device_unregister(&iss->v4l2_dev);
928 media_device_unregister(&iss->media_dev);
932 * iss_register_subdev_group - Register a group of subdevices
933 * @iss: OMAP4 ISS device
934 * @board_info: I2C subdevs board information array
936 * Register all I2C subdevices in the board_info array. The array must be
937 * terminated by a NULL entry, and the first entry must be the sensor.
939 * Return a pointer to the sensor media entity if it has been successfully
940 * registered, or NULL otherwise.
942 static struct v4l2_subdev *
943 iss_register_subdev_group(struct iss_device *iss,
944 struct iss_subdev_i2c_board_info *board_info)
946 struct v4l2_subdev *sensor = NULL;
949 if (!board_info->board_info)
952 for (first = 1; board_info->board_info; ++board_info, first = 0) {
953 struct v4l2_subdev *subdev;
954 struct i2c_adapter *adapter;
956 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
959 "%s: Unable to get I2C adapter %d for device %s\n",
960 __func__, board_info->i2c_adapter_id,
961 board_info->board_info->type);
965 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
966 board_info->board_info, NULL);
968 dev_err(iss->dev, "Unable to register subdev %s\n",
969 board_info->board_info->type);
980 static int iss_register_entities(struct iss_device *iss)
982 struct iss_platform_data *pdata = iss->pdata;
983 struct iss_v4l2_subdevs_group *subdevs;
986 iss->media_dev.dev = iss->dev;
987 strscpy(iss->media_dev.model, "TI OMAP4 ISS",
988 sizeof(iss->media_dev.model));
989 iss->media_dev.hw_revision = iss->revision;
990 iss->media_dev.ops = &iss_media_ops;
991 ret = media_device_register(&iss->media_dev);
993 dev_err(iss->dev, "Media device registration failed (%d)\n",
998 iss->v4l2_dev.mdev = &iss->media_dev;
999 ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1001 dev_err(iss->dev, "V4L2 device registration failed (%d)\n",
1006 /* Register internal entities */
1007 ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1011 ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1015 ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1019 ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1023 ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1027 /* Register external entities */
1028 for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1029 struct v4l2_subdev *sensor;
1030 struct media_entity *input;
1034 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1038 sensor->host_priv = subdevs;
1040 /* Connect the sensor to the correct interface module.
1041 * CSI2a receiver through CSIPHY1, or
1042 * CSI2b receiver through CSIPHY2
1044 switch (subdevs->interface) {
1045 case ISS_INTERFACE_CSI2A_PHY1:
1046 input = &iss->csi2a.subdev.entity;
1047 pad = CSI2_PAD_SINK;
1048 flags = MEDIA_LNK_FL_IMMUTABLE
1049 | MEDIA_LNK_FL_ENABLED;
1052 case ISS_INTERFACE_CSI2B_PHY2:
1053 input = &iss->csi2b.subdev.entity;
1054 pad = CSI2_PAD_SINK;
1055 flags = MEDIA_LNK_FL_IMMUTABLE
1056 | MEDIA_LNK_FL_ENABLED;
1060 dev_err(iss->dev, "invalid interface type %u\n",
1061 subdevs->interface);
1066 ret = media_create_pad_link(&sensor->entity, 0, input, pad,
1072 ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1076 iss_unregister_entities(iss);
1082 * iss_create_links() - Pads links creation for the subdevices
1083 * @iss : Pointer to ISS device
1085 * return negative error code or zero on success
1087 static int iss_create_links(struct iss_device *iss)
1091 ret = omap4iss_csi2_create_links(iss);
1093 dev_err(iss->dev, "CSI2 pads links creation failed\n");
1097 ret = omap4iss_ipipeif_create_links(iss);
1099 dev_err(iss->dev, "ISP IPIPEIF pads links creation failed\n");
1103 ret = omap4iss_resizer_create_links(iss);
1105 dev_err(iss->dev, "ISP RESIZER pads links creation failed\n");
1109 /* Connect the submodules. */
1110 ret = media_create_pad_link(
1111 &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1112 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1116 ret = media_create_pad_link(
1117 &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1118 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1122 ret = media_create_pad_link(
1123 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1124 &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1128 ret = media_create_pad_link(
1129 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1130 &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1134 ret = media_create_pad_link(
1135 &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1136 &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1143 static void iss_cleanup_modules(struct iss_device *iss)
1145 omap4iss_csi2_cleanup(iss);
1146 omap4iss_ipipeif_cleanup(iss);
1147 omap4iss_ipipe_cleanup(iss);
1148 omap4iss_resizer_cleanup(iss);
1151 static int iss_initialize_modules(struct iss_device *iss)
1155 ret = omap4iss_csiphy_init(iss);
1157 dev_err(iss->dev, "CSI PHY initialization failed\n");
1161 ret = omap4iss_csi2_init(iss);
1163 dev_err(iss->dev, "CSI2 initialization failed\n");
1167 ret = omap4iss_ipipeif_init(iss);
1169 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1173 ret = omap4iss_ipipe_init(iss);
1175 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1179 ret = omap4iss_resizer_init(iss);
1181 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1188 omap4iss_ipipe_cleanup(iss);
1190 omap4iss_ipipeif_cleanup(iss);
1192 omap4iss_csi2_cleanup(iss);
1198 static int iss_probe(struct platform_device *pdev)
1200 struct iss_platform_data *pdata = pdev->dev.platform_data;
1201 struct iss_device *iss;
1208 iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1212 mutex_init(&iss->iss_mutex);
1214 iss->dev = &pdev->dev;
1217 iss->raw_dmamask = DMA_BIT_MASK(32);
1218 iss->dev->dma_mask = &iss->raw_dmamask;
1219 iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1221 platform_set_drvdata(pdev, iss);
1224 * TODO: When implementing DT support switch to syscon regmap lookup by
1227 iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
1228 if (IS_ERR(iss->syscon)) {
1229 ret = PTR_ERR(iss->syscon);
1234 ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1238 ret = iss_get_clocks(iss);
1242 if (!omap4iss_get(iss)) {
1247 ret = iss_reset(iss);
1251 iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1252 dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1254 for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1255 ret = iss_map_mem_resource(pdev, iss, i);
1260 /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1261 iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1262 BTE_CTRL_BW_LIMITER_MASK,
1263 18 << BTE_CTRL_BW_LIMITER_SHIFT);
1265 /* Perform ISP reset */
1266 ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1270 ret = iss_isp_reset(iss);
1274 dev_info(iss->dev, "ISP Revision %08x found\n",
1275 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1278 ret = platform_get_irq(pdev, 0);
1285 if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1286 "OMAP4 ISS", iss)) {
1287 dev_err(iss->dev, "Unable to request IRQ\n");
1293 ret = iss_initialize_modules(iss);
1297 ret = iss_register_entities(iss);
1301 ret = media_entity_enum_init(&iss->crashed, &iss->media_dev);
1303 goto error_entities;
1305 ret = iss_create_links(iss);
1307 goto error_entities;
1314 iss_unregister_entities(iss);
1315 media_entity_enum_cleanup(&iss->crashed);
1317 iss_cleanup_modules(iss);
1321 mutex_destroy(&iss->iss_mutex);
1326 static void iss_remove(struct platform_device *pdev)
1328 struct iss_device *iss = platform_get_drvdata(pdev);
1330 iss_unregister_entities(iss);
1331 media_entity_enum_cleanup(&iss->crashed);
1332 iss_cleanup_modules(iss);
1335 static const struct platform_device_id omap4iss_id_table[] = {
1339 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1341 static struct platform_driver iss_driver = {
1343 .remove_new = iss_remove,
1344 .id_table = omap4iss_id_table,
1350 module_platform_driver(iss_driver);
1352 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1353 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1354 MODULE_LICENSE("GPL");