2 * TI OMAP4 ISS V4L2 Driver
4 * Copyright (C) 2012, Texas Instruments
6 * Author: Sergio Aguirre <sergio.a.aguirre@gmail.com>
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.
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>
27 #include <media/v4l2-common.h>
28 #include <media/v4l2-device.h>
29 #include <media/v4l2-ctrls.h>
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))
38 static void iss_print_status(struct iss_device *iss)
40 dev_dbg(iss->dev, "-------------ISS HL Register dump-------------\n");
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);
51 dev_dbg(iss->dev, "-----------------------------------------------\n");
55 * omap4iss_flush - Post pending L3 bus writes by doing a register readback
56 * @iss: OMAP4 ISS device
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.
61 * See this link for reference:
62 * http://www.mail-archive.com/linux-omap@vger.kernel.org/msg08149.html
64 void omap4iss_flush(struct iss_device *iss)
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);
71 * iss_isp_enable_interrupts - Enable ISS ISP interrupts.
72 * @iss: OMAP4 ISS device
74 static void omap4iss_isp_enable_interrupts(struct iss_device *iss)
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 |
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),
89 * iss_isp_disable_interrupts - Disable ISS interrupts.
90 * @iss: OMAP4 ISS device
92 static void omap4iss_isp_disable_interrupts(struct iss_device *iss)
94 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQENABLE_CLR(0), ~0);
98 * iss_enable_interrupts - Enable ISS interrupts.
99 * @iss: OMAP4 ISS device
101 static void iss_enable_interrupts(struct iss_device *iss)
103 static const u32 hl_irq = ISS_HL_IRQ_CSIA | ISS_HL_IRQ_CSIB
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);
110 if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
111 omap4iss_isp_enable_interrupts(iss);
115 * iss_disable_interrupts - Disable ISS interrupts.
116 * @iss: OMAP4 ISS device
118 static void iss_disable_interrupts(struct iss_device *iss)
120 if (iss->regs[OMAP4_ISS_MEM_ISP_SYS1])
121 omap4iss_isp_disable_interrupts(iss);
123 iss_reg_write(iss, OMAP4_ISS_MEM_TOP, ISS_HL_IRQENABLE_CLR(5), ~0);
126 int omap4iss_get_external_info(struct iss_pipeline *pipe,
127 struct media_link *link)
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;
138 if (pipe->external_rate)
141 memset(&fmt, 0, sizeof(fmt));
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);
150 pipe->external_bpp = omap4iss_video_format_info(fmt.format.code)->bpp;
152 ctrl = v4l2_ctrl_find(pipe->external->ctrl_handler,
153 V4L2_CID_PIXEL_RATE);
155 dev_warn(iss->dev, "no pixel rate control in subdev %s\n",
156 pipe->external->name);
160 pipe->external_rate = v4l2_ctrl_g_ctrl_int64(ctrl);
166 * Configure the bridge. Valid inputs are
168 * IPIPEIF_INPUT_CSI2A: CSI2a receiver
169 * IPIPEIF_INPUT_CSI2B: CSI2b receiver
171 * The bridge and lane shifter are configured according to the selected input
172 * and the ISP platform data.
174 void omap4iss_configure_bridge(struct iss_device *iss,
175 enum ipipeif_input_entity input)
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;
184 isp5ctrl_val = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL);
187 case IPIPEIF_INPUT_CSI2A:
188 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2A;
191 case IPIPEIF_INPUT_CSI2B:
192 issctrl_val |= ISS_CTRL_INPUT_SEL_CSI2B;
199 issctrl_val |= ISS_CTRL_SYNC_DETECT_VS_RAISING;
201 isp5ctrl_val |= ISP5_CTRL_VD_PULSE_EXT | ISP5_CTRL_PSYNC_CLK_SEL |
202 ISP5_CTRL_SYNC_ENABLE;
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);
209 static void iss_isr_dbg(struct iss_device *iss, u32 irqstatus)
211 static const char * const name[] = {
247 dev_dbg(iss->dev, "ISS IRQ: ");
249 for (i = 0; i < ARRAY_SIZE(name); i++) {
250 if ((1 << i) & irqstatus)
251 pr_cont("%s ", name[i]);
256 static void iss_isp_isr_dbg(struct iss_device *iss, u32 irqstatus)
258 static const char * const name[] = {
278 "RSZ_FIFO_IN_BLK_ERR",
294 dev_dbg(iss->dev, "ISP IRQ: ");
296 for (i = 0; i < ARRAY_SIZE(name); i++) {
297 if ((1 << i) & irqstatus)
298 pr_cont("%s ", name[i]);
305 * iss_isr - Interrupt Service Routine for ISS module.
306 * @irq: Not used currently.
307 * @_iss: Pointer to the OMAP4 ISS device
309 * Handles the corresponding callback if plugged in.
311 * Returns IRQ_HANDLED when IRQ was correctly handled, or IRQ_NONE when the
312 * IRQ wasn't handled.
314 static irqreturn_t iss_isr(int irq, void *_iss)
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;
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);
327 if (irqstatus & ISS_HL_IRQ_CSIA)
328 omap4iss_csi2_isr(&iss->csi2a);
330 if (irqstatus & ISS_HL_IRQ_CSIB)
331 omap4iss_csi2_isr(&iss->csi2b);
333 if (irqstatus & ISS_HL_IRQ_ISP(0)) {
334 u32 isp_irqstatus = iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1,
336 iss_reg_write(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_IRQSTATUS(0),
339 if (isp_irqstatus & ISP5_IRQ_OCP_ERR)
340 dev_dbg(iss->dev, "ISP5 OCP Error!\n");
342 if (isp_irqstatus & ipipeif_events) {
343 omap4iss_ipipeif_isr(&iss->ipipeif,
344 isp_irqstatus & ipipeif_events);
347 if (isp_irqstatus & resizer_events)
348 omap4iss_resizer_isr(&iss->resizer,
349 isp_irqstatus & resizer_events);
352 iss_isp_isr_dbg(iss, isp_irqstatus);
359 iss_isr_dbg(iss, irqstatus);
365 static const struct media_device_ops iss_media_ops = {
366 .link_notify = v4l2_pipeline_link_notify,
369 /* -----------------------------------------------------------------------------
370 * Pipeline stream management
374 * iss_pipeline_disable - Disable streaming on a pipeline
375 * @pipe: ISS pipeline
376 * @until: entity at which to stop pipeline walk
378 * Walk the entities chain starting at the pipeline output video node and stop
379 * all modules in the chain. Wait synchronously for the modules to be stopped if
382 * If the until argument isn't NULL, stop the pipeline walk when reaching the
383 * until entity. This is used to disable a partially started pipeline due to a
384 * subdev start error.
386 static int iss_pipeline_disable(struct iss_pipeline *pipe,
387 struct media_entity *until)
389 struct iss_device *iss = pipe->output->iss;
390 struct media_entity *entity;
391 struct media_pad *pad;
392 struct v4l2_subdev *subdev;
396 entity = &pipe->output->video.entity;
398 pad = &entity->pads[0];
399 if (!(pad->flags & MEDIA_PAD_FL_SINK))
402 pad = media_entity_remote_pad(pad);
403 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
406 entity = pad->entity;
410 subdev = media_entity_to_v4l2_subdev(entity);
411 ret = v4l2_subdev_call(subdev, video, s_stream, 0);
413 dev_warn(iss->dev, "%s: module stop timeout.\n",
415 /* If the entity failed to stopped, assume it has
416 * crashed. Mark it as such, the ISS will be reset when
417 * applications will release it.
419 media_entity_enum_set(&iss->crashed, &subdev->entity);
420 failure = -ETIMEDOUT;
428 * iss_pipeline_enable - Enable streaming on a pipeline
429 * @pipe: ISS pipeline
430 * @mode: Stream mode (single shot or continuous)
432 * Walk the entities chain starting at the pipeline output video node and start
433 * all modules in the chain in the given mode.
435 * Return 0 if successful, or the return value of the failed video::s_stream
436 * operation otherwise.
438 static int iss_pipeline_enable(struct iss_pipeline *pipe,
439 enum iss_pipeline_stream_state mode)
441 struct iss_device *iss = pipe->output->iss;
442 struct media_entity *entity;
443 struct media_pad *pad;
444 struct v4l2_subdev *subdev;
448 /* If one of the entities in the pipeline has crashed it will not work
449 * properly. Refuse to start streaming in that case. This check must be
450 * performed before the loop below to avoid starting entities if the
451 * pipeline won't start anyway (those entities would then likely fail to
452 * stop, making the problem worse).
454 if (media_entity_enum_intersects(&pipe->ent_enum, &iss->crashed))
457 spin_lock_irqsave(&pipe->lock, flags);
458 pipe->state &= ~(ISS_PIPELINE_IDLE_INPUT | ISS_PIPELINE_IDLE_OUTPUT);
459 spin_unlock_irqrestore(&pipe->lock, flags);
461 pipe->do_propagation = false;
463 entity = &pipe->output->video.entity;
465 pad = &entity->pads[0];
466 if (!(pad->flags & MEDIA_PAD_FL_SINK))
469 pad = media_entity_remote_pad(pad);
470 if (!pad || !is_media_entity_v4l2_subdev(pad->entity))
473 entity = pad->entity;
474 subdev = media_entity_to_v4l2_subdev(entity);
476 ret = v4l2_subdev_call(subdev, video, s_stream, mode);
477 if (ret < 0 && ret != -ENOIOCTLCMD) {
478 iss_pipeline_disable(pipe, entity);
482 if (subdev == &iss->csi2a.subdev ||
483 subdev == &iss->csi2b.subdev)
484 pipe->do_propagation = true;
487 iss_print_status(pipe->output->iss);
492 * omap4iss_pipeline_set_stream - Enable/disable streaming on a pipeline
493 * @pipe: ISS pipeline
494 * @state: Stream state (stopped, single shot or continuous)
496 * Set the pipeline to the given stream state. Pipelines can be started in
497 * single-shot or continuous mode.
499 * Return 0 if successful, or the return value of the failed video::s_stream
500 * operation otherwise. The pipeline state is not updated when the operation
501 * fails, except when stopping the pipeline.
503 int omap4iss_pipeline_set_stream(struct iss_pipeline *pipe,
504 enum iss_pipeline_stream_state state)
508 if (state == ISS_PIPELINE_STREAM_STOPPED)
509 ret = iss_pipeline_disable(pipe, NULL);
511 ret = iss_pipeline_enable(pipe, state);
513 if (ret == 0 || state == ISS_PIPELINE_STREAM_STOPPED)
514 pipe->stream_state = state;
520 * omap4iss_pipeline_cancel_stream - Cancel stream on a pipeline
521 * @pipe: ISS pipeline
523 * Cancelling a stream mark all buffers on all video nodes in the pipeline as
524 * erroneous and makes sure no new buffer can be queued. This function is called
525 * when a fatal error that prevents any further operation on the pipeline
528 void omap4iss_pipeline_cancel_stream(struct iss_pipeline *pipe)
531 omap4iss_video_cancel_stream(pipe->input);
533 omap4iss_video_cancel_stream(pipe->output);
537 * iss_pipeline_is_last - Verify if entity has an enabled link to the output
539 * @me: ISS module's media entity
541 * Returns 1 if the entity has an enabled link to the output video node or 0
542 * otherwise. It's true only while pipeline can have no more than one output
545 static int iss_pipeline_is_last(struct media_entity *me)
547 struct iss_pipeline *pipe;
548 struct media_pad *pad;
552 pipe = to_iss_pipeline(me);
553 if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED)
555 pad = media_entity_remote_pad(&pipe->output->pad);
556 return pad->entity == me;
559 static int iss_reset(struct iss_device *iss)
561 unsigned int timeout;
563 iss_reg_set(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG,
564 ISS_HL_SYSCONFIG_SOFTRESET);
566 timeout = iss_poll_condition_timeout(
567 !(iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_SYSCONFIG) &
568 ISS_HL_SYSCONFIG_SOFTRESET), 1000, 10, 100);
570 dev_err(iss->dev, "ISS reset timeout\n");
574 media_entity_enum_zero(&iss->crashed);
579 static int iss_isp_reset(struct iss_device *iss)
581 unsigned int timeout;
583 /* Fist, ensure that the ISP is IDLE (no transactions happening) */
584 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
585 ISP5_SYSCONFIG_STANDBYMODE_MASK,
586 ISP5_SYSCONFIG_STANDBYMODE_SMART);
588 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL, ISP5_CTRL_MSTANDBY);
590 timeout = iss_poll_condition_timeout(
591 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL) &
592 ISP5_CTRL_MSTANDBY_WAIT, 1000000, 1000, 1500);
594 dev_err(iss->dev, "ISP5 standby timeout\n");
598 /* Now finally, do the reset */
599 iss_reg_set(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG,
600 ISP5_SYSCONFIG_SOFTRESET);
602 timeout = iss_poll_condition_timeout(
603 !(iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_SYSCONFIG) &
604 ISP5_SYSCONFIG_SOFTRESET), 1000000, 1000, 1500);
606 dev_err(iss->dev, "ISP5 reset timeout\n");
614 * iss_module_sync_idle - Helper to sync module with its idle state
615 * @me: ISS submodule's media entity
616 * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
617 * @stopping: flag which tells module wants to stop
619 * This function checks if ISS submodule needs to wait for next interrupt. If
620 * yes, makes the caller to sleep while waiting for such event.
622 int omap4iss_module_sync_idle(struct media_entity *me, wait_queue_head_t *wait,
625 struct iss_pipeline *pipe = to_iss_pipeline(me);
626 struct iss_video *video = pipe->output;
629 if (pipe->stream_state == ISS_PIPELINE_STREAM_STOPPED ||
630 (pipe->stream_state == ISS_PIPELINE_STREAM_SINGLESHOT &&
631 !iss_pipeline_ready(pipe)))
635 * atomic_set() doesn't include memory barrier on ARM platform for SMP
636 * scenario. We'll call it here to avoid race conditions.
638 atomic_set(stopping, 1);
642 * If module is the last one, it's writing to memory. In this case,
643 * it's necessary to check if the module is already paused due to
644 * DMA queue underrun or if it has to wait for next interrupt to be
646 * If it isn't the last one, the function won't sleep but *stopping
647 * will still be set to warn next submodule caller's interrupt the
648 * module wants to be idle.
650 if (!iss_pipeline_is_last(me))
653 spin_lock_irqsave(&video->qlock, flags);
654 if (video->dmaqueue_flags & ISS_VIDEO_DMAQUEUE_UNDERRUN) {
655 spin_unlock_irqrestore(&video->qlock, flags);
656 atomic_set(stopping, 0);
660 spin_unlock_irqrestore(&video->qlock, flags);
661 if (!wait_event_timeout(*wait, !atomic_read(stopping),
662 msecs_to_jiffies(1000))) {
663 atomic_set(stopping, 0);
672 * omap4iss_module_sync_is_stopped - Helper to verify if module was stopping
673 * @wait: ISS submodule's wait queue for streamoff/interrupt synchronization
674 * @stopping: flag which tells module wants to stop
676 * This function checks if ISS submodule was stopping. In case of yes, it
677 * notices the caller by setting stopping to 0 and waking up the wait queue.
678 * Returns 1 if it was stopping or 0 otherwise.
680 int omap4iss_module_sync_is_stopping(wait_queue_head_t *wait,
683 if (atomic_cmpxchg(stopping, 1, 0)) {
691 /* --------------------------------------------------------------------------
695 #define ISS_CLKCTRL_MASK (ISS_CLKCTRL_CSI2_A |\
696 ISS_CLKCTRL_CSI2_B |\
699 static int __iss_subclk_update(struct iss_device *iss)
702 int ret = 0, timeout = 1000;
704 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_A)
705 clk |= ISS_CLKCTRL_CSI2_A;
707 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_CSI2_B)
708 clk |= ISS_CLKCTRL_CSI2_B;
710 if (iss->subclk_resources & OMAP4_ISS_SUBCLK_ISP)
711 clk |= ISS_CLKCTRL_ISP;
713 iss_reg_update(iss, OMAP4_ISS_MEM_TOP, ISS_CLKCTRL,
714 ISS_CLKCTRL_MASK, clk);
716 /* Wait for HW assertion */
717 while (--timeout > 0) {
719 if ((iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_CLKSTAT) &
720 ISS_CLKCTRL_MASK) == clk)
730 int omap4iss_subclk_enable(struct iss_device *iss,
731 enum iss_subclk_resource res)
733 iss->subclk_resources |= res;
735 return __iss_subclk_update(iss);
738 int omap4iss_subclk_disable(struct iss_device *iss,
739 enum iss_subclk_resource res)
741 iss->subclk_resources &= ~res;
743 return __iss_subclk_update(iss);
746 #define ISS_ISP5_CLKCTRL_MASK (ISP5_CTRL_BL_CLK_ENABLE |\
747 ISP5_CTRL_ISIF_CLK_ENABLE |\
748 ISP5_CTRL_H3A_CLK_ENABLE |\
749 ISP5_CTRL_RSZ_CLK_ENABLE |\
750 ISP5_CTRL_IPIPE_CLK_ENABLE |\
751 ISP5_CTRL_IPIPEIF_CLK_ENABLE)
753 static void __iss_isp_subclk_update(struct iss_device *iss)
757 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_ISIF)
758 clk |= ISP5_CTRL_ISIF_CLK_ENABLE;
760 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_H3A)
761 clk |= ISP5_CTRL_H3A_CLK_ENABLE;
763 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_RSZ)
764 clk |= ISP5_CTRL_RSZ_CLK_ENABLE;
766 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPE)
767 clk |= ISP5_CTRL_IPIPE_CLK_ENABLE;
769 if (iss->isp_subclk_resources & OMAP4_ISS_ISP_SUBCLK_IPIPEIF)
770 clk |= ISP5_CTRL_IPIPEIF_CLK_ENABLE;
773 clk |= ISP5_CTRL_BL_CLK_ENABLE;
775 iss_reg_update(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_CTRL,
776 ISS_ISP5_CLKCTRL_MASK, clk);
779 void omap4iss_isp_subclk_enable(struct iss_device *iss,
780 enum iss_isp_subclk_resource res)
782 iss->isp_subclk_resources |= res;
784 __iss_isp_subclk_update(iss);
787 void omap4iss_isp_subclk_disable(struct iss_device *iss,
788 enum iss_isp_subclk_resource res)
790 iss->isp_subclk_resources &= ~res;
792 __iss_isp_subclk_update(iss);
796 * iss_enable_clocks - Enable ISS clocks
797 * @iss: OMAP4 ISS device
799 * Return 0 if successful, or clk_enable return value if any of tthem fails.
801 static int iss_enable_clocks(struct iss_device *iss)
805 ret = clk_enable(iss->iss_fck);
807 dev_err(iss->dev, "clk_enable iss_fck failed\n");
811 ret = clk_enable(iss->iss_ctrlclk);
813 dev_err(iss->dev, "clk_enable iss_ctrlclk failed\n");
814 clk_disable(iss->iss_fck);
822 * iss_disable_clocks - Disable ISS clocks
823 * @iss: OMAP4 ISS device
825 static void iss_disable_clocks(struct iss_device *iss)
827 clk_disable(iss->iss_ctrlclk);
828 clk_disable(iss->iss_fck);
831 static int iss_get_clocks(struct iss_device *iss)
833 iss->iss_fck = devm_clk_get(iss->dev, "iss_fck");
834 if (IS_ERR(iss->iss_fck)) {
835 dev_err(iss->dev, "Unable to get iss_fck clock info\n");
836 return PTR_ERR(iss->iss_fck);
839 iss->iss_ctrlclk = devm_clk_get(iss->dev, "iss_ctrlclk");
840 if (IS_ERR(iss->iss_ctrlclk)) {
841 dev_err(iss->dev, "Unable to get iss_ctrlclk clock info\n");
842 return PTR_ERR(iss->iss_ctrlclk);
849 * omap4iss_get - Acquire the ISS resource.
851 * Initializes the clocks for the first acquire.
853 * Increment the reference count on the ISS. If the first reference is taken,
854 * enable clocks and power-up all submodules.
856 * Return a pointer to the ISS device structure, or NULL if an error occurred.
858 struct iss_device *omap4iss_get(struct iss_device *iss)
860 struct iss_device *__iss = iss;
865 mutex_lock(&iss->iss_mutex);
866 if (iss->ref_count > 0)
869 if (iss_enable_clocks(iss) < 0) {
874 iss_enable_interrupts(iss);
879 mutex_unlock(&iss->iss_mutex);
885 * omap4iss_put - Release the ISS
887 * Decrement the reference count on the ISS. If the last reference is released,
888 * power-down all submodules, disable clocks and free temporary buffers.
890 void omap4iss_put(struct iss_device *iss)
895 mutex_lock(&iss->iss_mutex);
896 BUG_ON(iss->ref_count == 0);
897 if (--iss->ref_count == 0) {
898 iss_disable_interrupts(iss);
899 /* Reset the ISS if an entity has failed to stop. This is the
900 * only way to recover from such conditions, although it would
901 * be worth investigating whether resetting the ISP only can't
902 * fix the problem in some cases.
904 if (!media_entity_enum_empty(&iss->crashed))
906 iss_disable_clocks(iss);
908 mutex_unlock(&iss->iss_mutex);
911 static int iss_map_mem_resource(struct platform_device *pdev,
912 struct iss_device *iss,
913 enum iss_mem_resources res)
915 struct resource *mem;
917 mem = platform_get_resource(pdev, IORESOURCE_MEM, res);
919 iss->regs[res] = devm_ioremap_resource(iss->dev, mem);
921 return PTR_ERR_OR_ZERO(iss->regs[res]);
924 static void iss_unregister_entities(struct iss_device *iss)
926 omap4iss_resizer_unregister_entities(&iss->resizer);
927 omap4iss_ipipe_unregister_entities(&iss->ipipe);
928 omap4iss_ipipeif_unregister_entities(&iss->ipipeif);
929 omap4iss_csi2_unregister_entities(&iss->csi2a);
930 omap4iss_csi2_unregister_entities(&iss->csi2b);
932 v4l2_device_unregister(&iss->v4l2_dev);
933 media_device_unregister(&iss->media_dev);
937 * iss_register_subdev_group - Register a group of subdevices
938 * @iss: OMAP4 ISS device
939 * @board_info: I2C subdevs board information array
941 * Register all I2C subdevices in the board_info array. The array must be
942 * terminated by a NULL entry, and the first entry must be the sensor.
944 * Return a pointer to the sensor media entity if it has been successfully
945 * registered, or NULL otherwise.
947 static struct v4l2_subdev *
948 iss_register_subdev_group(struct iss_device *iss,
949 struct iss_subdev_i2c_board_info *board_info)
951 struct v4l2_subdev *sensor = NULL;
954 if (!board_info->board_info)
957 for (first = 1; board_info->board_info; ++board_info, first = 0) {
958 struct v4l2_subdev *subdev;
959 struct i2c_adapter *adapter;
961 adapter = i2c_get_adapter(board_info->i2c_adapter_id);
964 "%s: Unable to get I2C adapter %d for device %s\n",
965 __func__, board_info->i2c_adapter_id,
966 board_info->board_info->type);
970 subdev = v4l2_i2c_new_subdev_board(&iss->v4l2_dev, adapter,
971 board_info->board_info, NULL);
973 dev_err(iss->dev, "Unable to register subdev %s\n",
974 board_info->board_info->type);
985 static int iss_register_entities(struct iss_device *iss)
987 struct iss_platform_data *pdata = iss->pdata;
988 struct iss_v4l2_subdevs_group *subdevs;
991 iss->media_dev.dev = iss->dev;
992 strlcpy(iss->media_dev.model, "TI OMAP4 ISS",
993 sizeof(iss->media_dev.model));
994 iss->media_dev.hw_revision = iss->revision;
995 iss->media_dev.ops = &iss_media_ops;
996 ret = media_device_register(&iss->media_dev);
998 dev_err(iss->dev, "Media device registration failed (%d)\n",
1003 iss->v4l2_dev.mdev = &iss->media_dev;
1004 ret = v4l2_device_register(iss->dev, &iss->v4l2_dev);
1006 dev_err(iss->dev, "V4L2 device registration failed (%d)\n",
1011 /* Register internal entities */
1012 ret = omap4iss_csi2_register_entities(&iss->csi2a, &iss->v4l2_dev);
1016 ret = omap4iss_csi2_register_entities(&iss->csi2b, &iss->v4l2_dev);
1020 ret = omap4iss_ipipeif_register_entities(&iss->ipipeif, &iss->v4l2_dev);
1024 ret = omap4iss_ipipe_register_entities(&iss->ipipe, &iss->v4l2_dev);
1028 ret = omap4iss_resizer_register_entities(&iss->resizer, &iss->v4l2_dev);
1032 /* Register external entities */
1033 for (subdevs = pdata->subdevs; subdevs && subdevs->subdevs; ++subdevs) {
1034 struct v4l2_subdev *sensor;
1035 struct media_entity *input;
1039 sensor = iss_register_subdev_group(iss, subdevs->subdevs);
1043 sensor->host_priv = subdevs;
1045 /* Connect the sensor to the correct interface module.
1046 * CSI2a receiver through CSIPHY1, or
1047 * CSI2b receiver through CSIPHY2
1049 switch (subdevs->interface) {
1050 case ISS_INTERFACE_CSI2A_PHY1:
1051 input = &iss->csi2a.subdev.entity;
1052 pad = CSI2_PAD_SINK;
1053 flags = MEDIA_LNK_FL_IMMUTABLE
1054 | MEDIA_LNK_FL_ENABLED;
1057 case ISS_INTERFACE_CSI2B_PHY2:
1058 input = &iss->csi2b.subdev.entity;
1059 pad = CSI2_PAD_SINK;
1060 flags = MEDIA_LNK_FL_IMMUTABLE
1061 | MEDIA_LNK_FL_ENABLED;
1065 dev_err(iss->dev, "invalid interface type %u\n",
1066 subdevs->interface);
1071 ret = media_create_pad_link(&sensor->entity, 0, input, pad,
1077 ret = v4l2_device_register_subdev_nodes(&iss->v4l2_dev);
1081 iss_unregister_entities(iss);
1087 * iss_create_links() - Pads links creation for the subdevices
1088 * @iss : Pointer to ISS device
1090 * return negative error code or zero on success
1092 static int iss_create_links(struct iss_device *iss)
1096 ret = omap4iss_csi2_create_links(iss);
1098 dev_err(iss->dev, "CSI2 pads links creation failed\n");
1102 ret = omap4iss_ipipeif_create_links(iss);
1104 dev_err(iss->dev, "ISP IPIPEIF pads links creation failed\n");
1108 ret = omap4iss_resizer_create_links(iss);
1110 dev_err(iss->dev, "ISP RESIZER pads links creation failed\n");
1114 /* Connect the submodules. */
1115 ret = media_create_pad_link(
1116 &iss->csi2a.subdev.entity, CSI2_PAD_SOURCE,
1117 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1121 ret = media_create_pad_link(
1122 &iss->csi2b.subdev.entity, CSI2_PAD_SOURCE,
1123 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SINK, 0);
1127 ret = media_create_pad_link(
1128 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1129 &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1133 ret = media_create_pad_link(
1134 &iss->ipipeif.subdev.entity, IPIPEIF_PAD_SOURCE_VP,
1135 &iss->ipipe.subdev.entity, IPIPE_PAD_SINK, 0);
1139 ret = media_create_pad_link(
1140 &iss->ipipe.subdev.entity, IPIPE_PAD_SOURCE_VP,
1141 &iss->resizer.subdev.entity, RESIZER_PAD_SINK, 0);
1148 static void iss_cleanup_modules(struct iss_device *iss)
1150 omap4iss_csi2_cleanup(iss);
1151 omap4iss_ipipeif_cleanup(iss);
1152 omap4iss_ipipe_cleanup(iss);
1153 omap4iss_resizer_cleanup(iss);
1156 static int iss_initialize_modules(struct iss_device *iss)
1160 ret = omap4iss_csiphy_init(iss);
1162 dev_err(iss->dev, "CSI PHY initialization failed\n");
1166 ret = omap4iss_csi2_init(iss);
1168 dev_err(iss->dev, "CSI2 initialization failed\n");
1172 ret = omap4iss_ipipeif_init(iss);
1174 dev_err(iss->dev, "ISP IPIPEIF initialization failed\n");
1178 ret = omap4iss_ipipe_init(iss);
1180 dev_err(iss->dev, "ISP IPIPE initialization failed\n");
1184 ret = omap4iss_resizer_init(iss);
1186 dev_err(iss->dev, "ISP RESIZER initialization failed\n");
1193 omap4iss_ipipe_cleanup(iss);
1195 omap4iss_ipipeif_cleanup(iss);
1197 omap4iss_csi2_cleanup(iss);
1203 static int iss_probe(struct platform_device *pdev)
1205 struct iss_platform_data *pdata = pdev->dev.platform_data;
1206 struct iss_device *iss;
1213 iss = devm_kzalloc(&pdev->dev, sizeof(*iss), GFP_KERNEL);
1217 mutex_init(&iss->iss_mutex);
1219 iss->dev = &pdev->dev;
1222 iss->raw_dmamask = DMA_BIT_MASK(32);
1223 iss->dev->dma_mask = &iss->raw_dmamask;
1224 iss->dev->coherent_dma_mask = DMA_BIT_MASK(32);
1226 platform_set_drvdata(pdev, iss);
1229 * TODO: When implementing DT support switch to syscon regmap lookup by
1232 iss->syscon = syscon_regmap_lookup_by_compatible("syscon");
1233 if (IS_ERR(iss->syscon)) {
1234 ret = PTR_ERR(iss->syscon);
1239 ret = iss_map_mem_resource(pdev, iss, OMAP4_ISS_MEM_TOP);
1243 ret = iss_get_clocks(iss);
1247 if (!omap4iss_get(iss))
1250 ret = iss_reset(iss);
1254 iss->revision = iss_reg_read(iss, OMAP4_ISS_MEM_TOP, ISS_HL_REVISION);
1255 dev_info(iss->dev, "Revision %08x found\n", iss->revision);
1257 for (i = 1; i < OMAP4_ISS_MEM_LAST; i++) {
1258 ret = iss_map_mem_resource(pdev, iss, i);
1263 /* Configure BTE BW_LIMITER field to max recommended value (1 GB) */
1264 iss_reg_update(iss, OMAP4_ISS_MEM_BTE, BTE_CTRL,
1265 BTE_CTRL_BW_LIMITER_MASK,
1266 18 << BTE_CTRL_BW_LIMITER_SHIFT);
1268 /* Perform ISP reset */
1269 ret = omap4iss_subclk_enable(iss, OMAP4_ISS_SUBCLK_ISP);
1273 ret = iss_isp_reset(iss);
1277 dev_info(iss->dev, "ISP Revision %08x found\n",
1278 iss_reg_read(iss, OMAP4_ISS_MEM_ISP_SYS1, ISP5_REVISION));
1281 ret = platform_get_irq(pdev, 0);
1283 dev_err(iss->dev, "No IRQ resource\n");
1289 if (devm_request_irq(iss->dev, iss->irq_num, iss_isr, IRQF_SHARED,
1290 "OMAP4 ISS", iss)) {
1291 dev_err(iss->dev, "Unable to request IRQ\n");
1297 ret = iss_initialize_modules(iss);
1301 ret = iss_register_entities(iss);
1305 ret = media_entity_enum_init(&iss->crashed, &iss->media_dev);
1307 goto error_entities;
1309 ret = iss_create_links(iss);
1311 goto error_entities;
1318 iss_unregister_entities(iss);
1319 media_entity_enum_cleanup(&iss->crashed);
1321 iss_cleanup_modules(iss);
1325 mutex_destroy(&iss->iss_mutex);
1330 static int iss_remove(struct platform_device *pdev)
1332 struct iss_device *iss = platform_get_drvdata(pdev);
1334 iss_unregister_entities(iss);
1335 media_entity_enum_cleanup(&iss->crashed);
1336 iss_cleanup_modules(iss);
1341 static const struct platform_device_id omap4iss_id_table[] = {
1345 MODULE_DEVICE_TABLE(platform, omap4iss_id_table);
1347 static struct platform_driver iss_driver = {
1349 .remove = iss_remove,
1350 .id_table = omap4iss_id_table,
1356 module_platform_driver(iss_driver);
1358 MODULE_DESCRIPTION("TI OMAP4 ISS driver");
1359 MODULE_AUTHOR("Sergio Aguirre <sergio.a.aguirre@gmail.com>");
1360 MODULE_LICENSE("GPL");
1361 MODULE_VERSION(ISS_VIDEO_DRIVER_VERSION);