1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2011 Atmel Corporation
4 * Josh Wu, <josh.wu@atmel.com>
6 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
8 * Based on the bttv driver for Bt848 with respective copyright holders
11 #include <linux/clk.h>
12 #include <linux/completion.h>
13 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/of_graph.h>
20 #include <linux/platform_device.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/slab.h>
25 #include <linux/videodev2.h>
26 #include <media/v4l2-ctrls.h>
27 #include <media/v4l2-device.h>
28 #include <media/v4l2-dev.h>
29 #include <media/v4l2-ioctl.h>
30 #include <media/v4l2-event.h>
31 #include <media/v4l2-fwnode.h>
32 #include <media/videobuf2-dma-contig.h>
33 #include <media/v4l2-image-sizes.h>
35 #include "atmel-isi.h"
37 #define MAX_SUPPORT_WIDTH 2048U
38 #define MAX_SUPPORT_HEIGHT 2048U
39 #define MIN_FRAME_RATE 15
40 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
42 /* Frame buffer descriptor */
44 /* Physical address of the frame buffer */
46 /* DMA Control Register(only in HISI2) */
48 /* Physical address of the next fbd */
52 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
54 fb_desc->dma_ctrl = ctrl;
58 struct list_head list;
63 /* Frame buffer data */
65 struct vb2_v4l2_buffer vb;
66 struct isi_dma_desc *p_dma_desc;
67 struct list_head list;
70 struct isi_graph_entity {
71 struct device_node *node;
73 struct v4l2_subdev *subdev;
77 * struct isi_format - ISI media bus format information
78 * @fourcc: Fourcc code for this format
79 * @mbus_code: V4L2 media bus format code.
80 * @bpp: Bytes per pixel (when stored in memory)
81 * @swap: Byte swap configuration value
82 * @support: Indicates format supported by subdev
83 * @skip: Skip duplicate format supported by subdev
94 /* Protects the access of variables shared with the ISR */
101 /* Allocate descriptors for dma buffer use */
102 struct fbd *p_fb_descriptors;
103 dma_addr_t fb_descriptors_phys;
104 struct list_head dma_desc_head;
105 struct isi_dma_desc dma_desc[VIDEO_MAX_FRAME];
106 bool enable_preview_path;
108 struct completion complete;
109 /* ISI peripheral clock */
113 struct isi_platform_data pdata;
114 u16 width_flags; /* max 12 bits */
116 struct list_head video_buffer_list;
117 struct frame_buffer *active;
119 struct v4l2_device v4l2_dev;
120 struct video_device *vdev;
121 struct v4l2_async_notifier notifier;
122 struct isi_graph_entity entity;
123 struct v4l2_format fmt;
125 const struct isi_format **user_formats;
126 unsigned int num_user_formats;
127 const struct isi_format *current_fmt;
130 struct vb2_queue queue;
133 #define notifier_to_isi(n) container_of(n, struct atmel_isi, notifier)
135 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
137 writel(val, isi->regs + reg);
139 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
141 return readl(isi->regs + reg);
144 static void configure_geometry(struct atmel_isi *isi)
147 u32 fourcc = isi->current_fmt->fourcc;
149 isi->enable_preview_path = fourcc == V4L2_PIX_FMT_RGB565 ||
150 fourcc == V4L2_PIX_FMT_RGB32 ||
151 fourcc == V4L2_PIX_FMT_Y16;
153 /* According to sensor's output format to set cfg2 */
154 cfg2 = isi->current_fmt->swap;
156 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
158 cfg2 |= ((isi->fmt.fmt.pix.width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
159 ISI_CFG2_IM_HSIZE_MASK;
161 cfg2 |= ((isi->fmt.fmt.pix.height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
162 & ISI_CFG2_IM_VSIZE_MASK;
163 isi_writel(isi, ISI_CFG2, cfg2);
165 /* No down sampling, preview size equal to sensor output size */
166 psize = ((isi->fmt.fmt.pix.width - 1) << ISI_PSIZE_PREV_HSIZE_OFFSET) &
167 ISI_PSIZE_PREV_HSIZE_MASK;
168 psize |= ((isi->fmt.fmt.pix.height - 1) << ISI_PSIZE_PREV_VSIZE_OFFSET) &
169 ISI_PSIZE_PREV_VSIZE_MASK;
170 isi_writel(isi, ISI_PSIZE, psize);
171 isi_writel(isi, ISI_PDECF, ISI_PDECF_NO_SAMPLING);
174 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
177 struct vb2_v4l2_buffer *vbuf = &isi->active->vb;
178 struct frame_buffer *buf = isi->active;
180 list_del_init(&buf->list);
181 vbuf->vb2_buf.timestamp = ktime_get_ns();
182 vbuf->sequence = isi->sequence++;
183 vbuf->field = V4L2_FIELD_NONE;
184 vb2_buffer_done(&vbuf->vb2_buf, VB2_BUF_STATE_DONE);
187 if (list_empty(&isi->video_buffer_list)) {
190 /* start next dma frame. */
191 isi->active = list_entry(isi->video_buffer_list.next,
192 struct frame_buffer, list);
193 if (!isi->enable_preview_path) {
194 isi_writel(isi, ISI_DMA_C_DSCR,
195 (u32)isi->active->p_dma_desc->fbd_phys);
196 isi_writel(isi, ISI_DMA_C_CTRL,
197 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
198 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
200 isi_writel(isi, ISI_DMA_P_DSCR,
201 (u32)isi->active->p_dma_desc->fbd_phys);
202 isi_writel(isi, ISI_DMA_P_CTRL,
203 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
204 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
210 /* ISI interrupt service routine */
211 static irqreturn_t isi_interrupt(int irq, void *dev_id)
213 struct atmel_isi *isi = dev_id;
214 u32 status, mask, pending;
215 irqreturn_t ret = IRQ_NONE;
217 spin_lock(&isi->irqlock);
219 status = isi_readl(isi, ISI_STATUS);
220 mask = isi_readl(isi, ISI_INTMASK);
221 pending = status & mask;
223 if (pending & ISI_CTRL_SRST) {
224 complete(&isi->complete);
225 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
227 } else if (pending & ISI_CTRL_DIS) {
228 complete(&isi->complete);
229 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
232 if (likely(pending & ISI_SR_CXFR_DONE) ||
233 likely(pending & ISI_SR_PXFR_DONE))
234 ret = atmel_isi_handle_streaming(isi);
237 spin_unlock(&isi->irqlock);
241 #define WAIT_ISI_RESET 1
242 #define WAIT_ISI_DISABLE 0
243 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
245 unsigned long timeout;
247 * The reset or disable will only succeed if we have a
248 * pixel clock from the camera.
250 init_completion(&isi->complete);
253 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
254 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
256 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
257 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
260 timeout = wait_for_completion_timeout(&isi->complete,
261 msecs_to_jiffies(500));
268 /* ------------------------------------------------------------------
270 ------------------------------------------------------------------*/
271 static int queue_setup(struct vb2_queue *vq,
272 unsigned int *nbuffers, unsigned int *nplanes,
273 unsigned int sizes[], struct device *alloc_devs[])
275 struct atmel_isi *isi = vb2_get_drv_priv(vq);
278 size = isi->fmt.fmt.pix.sizeimage;
280 /* Make sure the image size is large enough. */
282 return sizes[0] < size ? -EINVAL : 0;
289 dev_dbg(isi->dev, "%s, count=%d, size=%ld\n", __func__,
295 static int buffer_init(struct vb2_buffer *vb)
297 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
298 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
300 buf->p_dma_desc = NULL;
301 INIT_LIST_HEAD(&buf->list);
306 static int buffer_prepare(struct vb2_buffer *vb)
308 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
309 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
310 struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
312 struct isi_dma_desc *desc;
314 size = isi->fmt.fmt.pix.sizeimage;
316 if (vb2_plane_size(vb, 0) < size) {
317 dev_err(isi->dev, "%s data will not fit into plane (%lu < %lu)\n",
318 __func__, vb2_plane_size(vb, 0), size);
322 vb2_set_plane_payload(vb, 0, size);
324 if (!buf->p_dma_desc) {
325 if (list_empty(&isi->dma_desc_head)) {
326 dev_err(isi->dev, "Not enough dma descriptors.\n");
329 /* Get an available descriptor */
330 desc = list_entry(isi->dma_desc_head.next,
331 struct isi_dma_desc, list);
332 /* Delete the descriptor since now it is used */
333 list_del_init(&desc->list);
335 /* Initialize the dma descriptor */
336 desc->p_fbd->fb_address =
337 vb2_dma_contig_plane_dma_addr(vb, 0);
338 desc->p_fbd->next_fbd_address = 0;
339 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
341 buf->p_dma_desc = desc;
347 static void buffer_cleanup(struct vb2_buffer *vb)
349 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
350 struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
351 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
353 /* This descriptor is available now and we add to head list */
355 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
358 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
362 cfg1 = isi_readl(isi, ISI_CFG1);
363 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
364 isi_writel(isi, ISI_INTEN,
365 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
367 /* Check if already in a frame */
368 if (!isi->enable_preview_path) {
369 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
370 dev_err(isi->dev, "Already in frame handling.\n");
374 isi_writel(isi, ISI_DMA_C_DSCR,
375 (u32)buffer->p_dma_desc->fbd_phys);
376 isi_writel(isi, ISI_DMA_C_CTRL,
377 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
378 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
380 isi_writel(isi, ISI_DMA_P_DSCR,
381 (u32)buffer->p_dma_desc->fbd_phys);
382 isi_writel(isi, ISI_DMA_P_CTRL,
383 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
384 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_P_CH);
387 cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
388 /* Enable linked list */
389 cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
394 if (!isi->enable_preview_path)
395 ctrl |= ISI_CTRL_CDC;
397 isi_writel(isi, ISI_CTRL, ctrl);
398 isi_writel(isi, ISI_CFG1, cfg1);
401 static void buffer_queue(struct vb2_buffer *vb)
403 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
404 struct atmel_isi *isi = vb2_get_drv_priv(vb->vb2_queue);
405 struct frame_buffer *buf = container_of(vbuf, struct frame_buffer, vb);
406 unsigned long flags = 0;
408 spin_lock_irqsave(&isi->irqlock, flags);
409 list_add_tail(&buf->list, &isi->video_buffer_list);
413 if (vb2_is_streaming(vb->vb2_queue))
416 spin_unlock_irqrestore(&isi->irqlock, flags);
419 static int start_streaming(struct vb2_queue *vq, unsigned int count)
421 struct atmel_isi *isi = vb2_get_drv_priv(vq);
422 struct frame_buffer *buf, *node;
425 pm_runtime_get_sync(isi->dev);
427 /* Enable stream on the sub device */
428 ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 1);
429 if (ret && ret != -ENOIOCTLCMD) {
430 dev_err(isi->dev, "stream on failed in subdev\n");
431 goto err_start_stream;
435 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
437 dev_err(isi->dev, "Reset ISI timed out\n");
440 /* Disable all interrupts */
441 isi_writel(isi, ISI_INTDIS, (u32)~0UL);
444 configure_geometry(isi);
446 spin_lock_irq(&isi->irqlock);
447 /* Clear any pending interrupt */
448 isi_readl(isi, ISI_STATUS);
450 start_dma(isi, isi->active);
451 spin_unlock_irq(&isi->irqlock);
456 v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
459 pm_runtime_put(isi->dev);
461 spin_lock_irq(&isi->irqlock);
463 /* Release all active buffers */
464 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
465 list_del_init(&buf->list);
466 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_QUEUED);
468 spin_unlock_irq(&isi->irqlock);
473 /* abort streaming and wait for last buffer */
474 static void stop_streaming(struct vb2_queue *vq)
476 struct atmel_isi *isi = vb2_get_drv_priv(vq);
477 struct frame_buffer *buf, *node;
479 unsigned long timeout;
481 /* Disable stream on the sub device */
482 ret = v4l2_subdev_call(isi->entity.subdev, video, s_stream, 0);
483 if (ret && ret != -ENOIOCTLCMD)
484 dev_err(isi->dev, "stream off failed in subdev\n");
486 spin_lock_irq(&isi->irqlock);
488 /* Release all active buffers */
489 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
490 list_del_init(&buf->list);
491 vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
493 spin_unlock_irq(&isi->irqlock);
495 if (!isi->enable_preview_path) {
496 timeout = jiffies + (FRAME_INTERVAL_MILLI_SEC * HZ) / 1000;
497 /* Wait until the end of the current frame. */
498 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
499 time_before(jiffies, timeout))
502 if (time_after(jiffies, timeout))
504 "Timeout waiting for finishing codec request\n");
507 /* Disable interrupts */
508 isi_writel(isi, ISI_INTDIS,
509 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
511 /* Disable ISI and wait for it is done */
512 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
514 dev_err(isi->dev, "Disable ISI timed out\n");
516 pm_runtime_put(isi->dev);
519 static const struct vb2_ops isi_video_qops = {
520 .queue_setup = queue_setup,
521 .buf_init = buffer_init,
522 .buf_prepare = buffer_prepare,
523 .buf_cleanup = buffer_cleanup,
524 .buf_queue = buffer_queue,
525 .start_streaming = start_streaming,
526 .stop_streaming = stop_streaming,
527 .wait_prepare = vb2_ops_wait_prepare,
528 .wait_finish = vb2_ops_wait_finish,
531 static int isi_g_fmt_vid_cap(struct file *file, void *priv,
532 struct v4l2_format *fmt)
534 struct atmel_isi *isi = video_drvdata(file);
541 static const struct isi_format *find_format_by_fourcc(struct atmel_isi *isi,
544 unsigned int num_formats = isi->num_user_formats;
545 const struct isi_format *fmt;
548 for (i = 0; i < num_formats; i++) {
549 fmt = isi->user_formats[i];
550 if (fmt->fourcc == fourcc)
557 static void isi_try_fse(struct atmel_isi *isi, const struct isi_format *isi_fmt,
558 struct v4l2_subdev_pad_config *pad_cfg)
561 struct v4l2_subdev_frame_size_enum fse = {
562 .code = isi_fmt->mbus_code,
563 .which = V4L2_SUBDEV_FORMAT_TRY,
566 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
569 * Attempt to obtain format size from subdev. If not available,
570 * just use the maximum ISI can receive.
573 pad_cfg->try_crop.width = MAX_SUPPORT_WIDTH;
574 pad_cfg->try_crop.height = MAX_SUPPORT_HEIGHT;
576 pad_cfg->try_crop.width = fse.max_width;
577 pad_cfg->try_crop.height = fse.max_height;
581 static int isi_try_fmt(struct atmel_isi *isi, struct v4l2_format *f,
582 const struct isi_format **current_fmt)
584 const struct isi_format *isi_fmt;
585 struct v4l2_pix_format *pixfmt = &f->fmt.pix;
586 struct v4l2_subdev_pad_config pad_cfg = {};
587 struct v4l2_subdev_format format = {
588 .which = V4L2_SUBDEV_FORMAT_TRY,
592 isi_fmt = find_format_by_fourcc(isi, pixfmt->pixelformat);
594 isi_fmt = isi->user_formats[isi->num_user_formats - 1];
595 pixfmt->pixelformat = isi_fmt->fourcc;
598 /* Limit to Atmel ISI hardware capabilities */
599 pixfmt->width = clamp(pixfmt->width, 0U, MAX_SUPPORT_WIDTH);
600 pixfmt->height = clamp(pixfmt->height, 0U, MAX_SUPPORT_HEIGHT);
602 v4l2_fill_mbus_format(&format.format, pixfmt, isi_fmt->mbus_code);
604 isi_try_fse(isi, isi_fmt, &pad_cfg);
606 ret = v4l2_subdev_call(isi->entity.subdev, pad, set_fmt,
611 v4l2_fill_pix_format(pixfmt, &format.format);
613 pixfmt->field = V4L2_FIELD_NONE;
614 pixfmt->bytesperline = pixfmt->width * isi_fmt->bpp;
615 pixfmt->sizeimage = pixfmt->bytesperline * pixfmt->height;
618 *current_fmt = isi_fmt;
623 static int isi_set_fmt(struct atmel_isi *isi, struct v4l2_format *f)
625 struct v4l2_subdev_format format = {
626 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
628 const struct isi_format *current_fmt;
631 ret = isi_try_fmt(isi, f, ¤t_fmt);
635 v4l2_fill_mbus_format(&format.format, &f->fmt.pix,
636 current_fmt->mbus_code);
637 ret = v4l2_subdev_call(isi->entity.subdev, pad,
638 set_fmt, NULL, &format);
643 isi->current_fmt = current_fmt;
648 static int isi_s_fmt_vid_cap(struct file *file, void *priv,
649 struct v4l2_format *f)
651 struct atmel_isi *isi = video_drvdata(file);
653 if (vb2_is_streaming(&isi->queue))
656 return isi_set_fmt(isi, f);
659 static int isi_try_fmt_vid_cap(struct file *file, void *priv,
660 struct v4l2_format *f)
662 struct atmel_isi *isi = video_drvdata(file);
664 return isi_try_fmt(isi, f, NULL);
667 static int isi_enum_fmt_vid_cap(struct file *file, void *priv,
668 struct v4l2_fmtdesc *f)
670 struct atmel_isi *isi = video_drvdata(file);
672 if (f->index >= isi->num_user_formats)
675 f->pixelformat = isi->user_formats[f->index]->fourcc;
679 static int isi_querycap(struct file *file, void *priv,
680 struct v4l2_capability *cap)
682 strscpy(cap->driver, "atmel-isi", sizeof(cap->driver));
683 strscpy(cap->card, "Atmel Image Sensor Interface", sizeof(cap->card));
684 strscpy(cap->bus_info, "platform:isi", sizeof(cap->bus_info));
688 static int isi_enum_input(struct file *file, void *priv,
689 struct v4l2_input *i)
694 i->type = V4L2_INPUT_TYPE_CAMERA;
695 strscpy(i->name, "Camera", sizeof(i->name));
699 static int isi_g_input(struct file *file, void *priv, unsigned int *i)
705 static int isi_s_input(struct file *file, void *priv, unsigned int i)
712 static int isi_g_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
714 struct atmel_isi *isi = video_drvdata(file);
716 return v4l2_g_parm_cap(video_devdata(file), isi->entity.subdev, a);
719 static int isi_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
721 struct atmel_isi *isi = video_drvdata(file);
723 return v4l2_s_parm_cap(video_devdata(file), isi->entity.subdev, a);
726 static int isi_enum_framesizes(struct file *file, void *fh,
727 struct v4l2_frmsizeenum *fsize)
729 struct atmel_isi *isi = video_drvdata(file);
730 const struct isi_format *isi_fmt;
731 struct v4l2_subdev_frame_size_enum fse = {
732 .index = fsize->index,
733 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
737 isi_fmt = find_format_by_fourcc(isi, fsize->pixel_format);
741 fse.code = isi_fmt->mbus_code;
743 ret = v4l2_subdev_call(isi->entity.subdev, pad, enum_frame_size,
748 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
749 fsize->discrete.width = fse.max_width;
750 fsize->discrete.height = fse.max_height;
755 static int isi_enum_frameintervals(struct file *file, void *fh,
756 struct v4l2_frmivalenum *fival)
758 struct atmel_isi *isi = video_drvdata(file);
759 const struct isi_format *isi_fmt;
760 struct v4l2_subdev_frame_interval_enum fie = {
761 .index = fival->index,
762 .width = fival->width,
763 .height = fival->height,
764 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
768 isi_fmt = find_format_by_fourcc(isi, fival->pixel_format);
772 fie.code = isi_fmt->mbus_code;
774 ret = v4l2_subdev_call(isi->entity.subdev, pad,
775 enum_frame_interval, NULL, &fie);
779 fival->type = V4L2_FRMIVAL_TYPE_DISCRETE;
780 fival->discrete = fie.interval;
785 static void isi_camera_set_bus_param(struct atmel_isi *isi)
789 /* set bus param for ISI */
790 if (isi->pdata.hsync_act_low)
791 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
792 if (isi->pdata.vsync_act_low)
793 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
794 if (isi->pdata.pclk_act_falling)
795 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
796 if (isi->pdata.has_emb_sync)
797 cfg1 |= ISI_CFG1_EMB_SYNC;
798 if (isi->pdata.full_mode)
799 cfg1 |= ISI_CFG1_FULL_MODE;
801 cfg1 |= ISI_CFG1_THMASK_BEATS_16;
803 /* Enable PM and peripheral clock before operate isi registers */
804 pm_runtime_get_sync(isi->dev);
806 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
807 isi_writel(isi, ISI_CFG1, cfg1);
809 pm_runtime_put(isi->dev);
812 /* -----------------------------------------------------------------------*/
813 static int atmel_isi_parse_dt(struct atmel_isi *isi,
814 struct platform_device *pdev)
816 struct device_node *np = pdev->dev.of_node;
817 struct v4l2_fwnode_endpoint ep = { .bus_type = 0 };
820 /* Default settings for ISI */
821 isi->pdata.full_mode = 1;
822 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
824 np = of_graph_get_next_endpoint(np, NULL);
826 dev_err(&pdev->dev, "Could not find the endpoint\n");
830 err = v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &ep);
833 dev_err(&pdev->dev, "Could not parse the endpoint\n");
837 switch (ep.bus.parallel.bus_width) {
839 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
842 isi->pdata.data_width_flags =
843 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
846 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
847 ep.bus.parallel.bus_width);
851 if (ep.bus.parallel.flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
852 isi->pdata.hsync_act_low = true;
853 if (ep.bus.parallel.flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
854 isi->pdata.vsync_act_low = true;
855 if (ep.bus.parallel.flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
856 isi->pdata.pclk_act_falling = true;
858 if (ep.bus_type == V4L2_MBUS_BT656)
859 isi->pdata.has_emb_sync = true;
864 static int isi_open(struct file *file)
866 struct atmel_isi *isi = video_drvdata(file);
867 struct v4l2_subdev *sd = isi->entity.subdev;
870 if (mutex_lock_interruptible(&isi->lock))
873 ret = v4l2_fh_open(file);
877 if (!v4l2_fh_is_singular_file(file))
880 ret = v4l2_subdev_call(sd, core, s_power, 1);
881 if (ret < 0 && ret != -ENOIOCTLCMD)
884 ret = isi_set_fmt(isi, &isi->fmt);
886 v4l2_subdev_call(sd, core, s_power, 0);
889 v4l2_fh_release(file);
891 mutex_unlock(&isi->lock);
895 static int isi_release(struct file *file)
897 struct atmel_isi *isi = video_drvdata(file);
898 struct v4l2_subdev *sd = isi->entity.subdev;
902 mutex_lock(&isi->lock);
904 fh_singular = v4l2_fh_is_singular_file(file);
906 ret = _vb2_fop_release(file, NULL);
909 v4l2_subdev_call(sd, core, s_power, 0);
911 mutex_unlock(&isi->lock);
916 static const struct v4l2_ioctl_ops isi_ioctl_ops = {
917 .vidioc_querycap = isi_querycap,
919 .vidioc_try_fmt_vid_cap = isi_try_fmt_vid_cap,
920 .vidioc_g_fmt_vid_cap = isi_g_fmt_vid_cap,
921 .vidioc_s_fmt_vid_cap = isi_s_fmt_vid_cap,
922 .vidioc_enum_fmt_vid_cap = isi_enum_fmt_vid_cap,
924 .vidioc_enum_input = isi_enum_input,
925 .vidioc_g_input = isi_g_input,
926 .vidioc_s_input = isi_s_input,
928 .vidioc_g_parm = isi_g_parm,
929 .vidioc_s_parm = isi_s_parm,
930 .vidioc_enum_framesizes = isi_enum_framesizes,
931 .vidioc_enum_frameintervals = isi_enum_frameintervals,
933 .vidioc_reqbufs = vb2_ioctl_reqbufs,
934 .vidioc_create_bufs = vb2_ioctl_create_bufs,
935 .vidioc_querybuf = vb2_ioctl_querybuf,
936 .vidioc_qbuf = vb2_ioctl_qbuf,
937 .vidioc_dqbuf = vb2_ioctl_dqbuf,
938 .vidioc_expbuf = vb2_ioctl_expbuf,
939 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
940 .vidioc_streamon = vb2_ioctl_streamon,
941 .vidioc_streamoff = vb2_ioctl_streamoff,
943 .vidioc_log_status = v4l2_ctrl_log_status,
944 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
945 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
948 static const struct v4l2_file_operations isi_fops = {
949 .owner = THIS_MODULE,
950 .unlocked_ioctl = video_ioctl2,
952 .release = isi_release,
953 .poll = vb2_fop_poll,
954 .mmap = vb2_fop_mmap,
955 .read = vb2_fop_read,
958 static int isi_set_default_fmt(struct atmel_isi *isi)
960 struct v4l2_format f = {
961 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
964 .height = VGA_HEIGHT,
965 .field = V4L2_FIELD_NONE,
966 .pixelformat = isi->user_formats[0]->fourcc,
971 ret = isi_try_fmt(isi, &f, NULL);
974 isi->current_fmt = isi->user_formats[0];
979 static const struct isi_format isi_formats[] = {
981 .fourcc = V4L2_PIX_FMT_YUYV,
982 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
984 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
986 .fourcc = V4L2_PIX_FMT_YUYV,
987 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
989 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
991 .fourcc = V4L2_PIX_FMT_YUYV,
992 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
994 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
996 .fourcc = V4L2_PIX_FMT_YUYV,
997 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
999 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1001 .fourcc = V4L2_PIX_FMT_RGB565,
1002 .mbus_code = MEDIA_BUS_FMT_YUYV8_2X8,
1004 .swap = ISI_CFG2_YCC_SWAP_MODE_2,
1006 .fourcc = V4L2_PIX_FMT_RGB565,
1007 .mbus_code = MEDIA_BUS_FMT_YVYU8_2X8,
1009 .swap = ISI_CFG2_YCC_SWAP_MODE_3,
1011 .fourcc = V4L2_PIX_FMT_RGB565,
1012 .mbus_code = MEDIA_BUS_FMT_UYVY8_2X8,
1014 .swap = ISI_CFG2_YCC_SWAP_DEFAULT,
1016 .fourcc = V4L2_PIX_FMT_RGB565,
1017 .mbus_code = MEDIA_BUS_FMT_VYUY8_2X8,
1019 .swap = ISI_CFG2_YCC_SWAP_MODE_1,
1021 .fourcc = V4L2_PIX_FMT_GREY,
1022 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1024 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1026 .fourcc = V4L2_PIX_FMT_Y16,
1027 .mbus_code = MEDIA_BUS_FMT_Y10_1X10,
1029 .swap = ISI_CFG2_GS_MODE_2_PIXEL | ISI_CFG2_GRAYSCALE,
1033 static int isi_formats_init(struct atmel_isi *isi)
1035 const struct isi_format *isi_fmts[ARRAY_SIZE(isi_formats)];
1036 unsigned int num_fmts = 0, i, j;
1037 struct v4l2_subdev *subdev = isi->entity.subdev;
1038 struct v4l2_subdev_mbus_code_enum mbus_code = {
1039 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1042 while (!v4l2_subdev_call(subdev, pad, enum_mbus_code,
1043 NULL, &mbus_code)) {
1044 for (i = 0; i < ARRAY_SIZE(isi_formats); i++) {
1045 if (isi_formats[i].mbus_code != mbus_code.code)
1048 /* Code supported, have we got this fourcc yet? */
1049 for (j = 0; j < num_fmts; j++)
1050 if (isi_fmts[j]->fourcc == isi_formats[i].fourcc)
1051 /* Already available */
1055 isi_fmts[num_fmts++] = isi_formats + i;
1063 isi->num_user_formats = num_fmts;
1064 isi->user_formats = devm_kcalloc(isi->dev,
1065 num_fmts, sizeof(struct isi_format *),
1067 if (!isi->user_formats)
1070 memcpy(isi->user_formats, isi_fmts,
1071 num_fmts * sizeof(struct isi_format *));
1072 isi->current_fmt = isi->user_formats[0];
1077 static int isi_graph_notify_complete(struct v4l2_async_notifier *notifier)
1079 struct atmel_isi *isi = notifier_to_isi(notifier);
1082 isi->vdev->ctrl_handler = isi->entity.subdev->ctrl_handler;
1083 ret = isi_formats_init(isi);
1085 dev_err(isi->dev, "No supported mediabus format found\n");
1088 isi_camera_set_bus_param(isi);
1090 ret = isi_set_default_fmt(isi);
1092 dev_err(isi->dev, "Could not set default format\n");
1096 ret = video_register_device(isi->vdev, VFL_TYPE_VIDEO, -1);
1098 dev_err(isi->dev, "Failed to register video device\n");
1102 dev_dbg(isi->dev, "Device registered as %s\n",
1103 video_device_node_name(isi->vdev));
1107 static void isi_graph_notify_unbind(struct v4l2_async_notifier *notifier,
1108 struct v4l2_subdev *sd,
1109 struct v4l2_async_subdev *asd)
1111 struct atmel_isi *isi = notifier_to_isi(notifier);
1113 dev_dbg(isi->dev, "Removing %s\n", video_device_node_name(isi->vdev));
1115 /* Checks internally if vdev have been init or not */
1116 video_unregister_device(isi->vdev);
1119 static int isi_graph_notify_bound(struct v4l2_async_notifier *notifier,
1120 struct v4l2_subdev *subdev,
1121 struct v4l2_async_subdev *asd)
1123 struct atmel_isi *isi = notifier_to_isi(notifier);
1125 dev_dbg(isi->dev, "subdev %s bound\n", subdev->name);
1127 isi->entity.subdev = subdev;
1132 static const struct v4l2_async_notifier_operations isi_graph_notify_ops = {
1133 .bound = isi_graph_notify_bound,
1134 .unbind = isi_graph_notify_unbind,
1135 .complete = isi_graph_notify_complete,
1138 static int isi_graph_init(struct atmel_isi *isi)
1140 struct v4l2_async_subdev *asd;
1141 struct device_node *ep;
1144 ep = of_graph_get_next_endpoint(isi->dev->of_node, NULL);
1148 v4l2_async_notifier_init(&isi->notifier);
1150 asd = v4l2_async_notifier_add_fwnode_remote_subdev(
1152 of_fwnode_handle(ep),
1153 struct v4l2_async_subdev);
1157 return PTR_ERR(asd);
1159 isi->notifier.ops = &isi_graph_notify_ops;
1161 ret = v4l2_async_notifier_register(&isi->v4l2_dev, &isi->notifier);
1163 dev_err(isi->dev, "Notifier registration failed\n");
1164 v4l2_async_notifier_cleanup(&isi->notifier);
1172 static int atmel_isi_probe(struct platform_device *pdev)
1175 struct atmel_isi *isi;
1176 struct vb2_queue *q;
1177 struct resource *regs;
1180 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
1184 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
1185 if (IS_ERR(isi->pclk))
1186 return PTR_ERR(isi->pclk);
1188 ret = atmel_isi_parse_dt(isi, pdev);
1193 isi->dev = &pdev->dev;
1194 mutex_init(&isi->lock);
1195 spin_lock_init(&isi->irqlock);
1196 INIT_LIST_HEAD(&isi->video_buffer_list);
1197 INIT_LIST_HEAD(&isi->dma_desc_head);
1201 /* Initialize the top-level structure */
1202 ret = v4l2_device_register(&pdev->dev, &isi->v4l2_dev);
1206 isi->vdev = video_device_alloc();
1209 goto err_vdev_alloc;
1213 isi->vdev->fops = &isi_fops;
1214 isi->vdev->v4l2_dev = &isi->v4l2_dev;
1215 isi->vdev->queue = &isi->queue;
1216 strscpy(isi->vdev->name, KBUILD_MODNAME, sizeof(isi->vdev->name));
1217 isi->vdev->release = video_device_release;
1218 isi->vdev->ioctl_ops = &isi_ioctl_ops;
1219 isi->vdev->lock = &isi->lock;
1220 isi->vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING |
1222 video_set_drvdata(isi->vdev, isi);
1225 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1226 q->io_modes = VB2_MMAP | VB2_READ | VB2_DMABUF;
1227 q->lock = &isi->lock;
1229 q->buf_struct_size = sizeof(struct frame_buffer);
1230 q->ops = &isi_video_qops;
1231 q->mem_ops = &vb2_dma_contig_memops;
1232 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
1233 q->min_buffers_needed = 2;
1234 q->dev = &pdev->dev;
1236 ret = vb2_queue_init(q);
1238 dev_err(&pdev->dev, "failed to initialize VB2 queue\n");
1241 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
1242 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1243 &isi->fb_descriptors_phys,
1245 if (!isi->p_fb_descriptors) {
1246 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1251 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
1252 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1253 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1254 i * sizeof(struct fbd);
1255 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1258 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1259 isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1260 if (IS_ERR(isi->regs)) {
1261 ret = PTR_ERR(isi->regs);
1265 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1266 isi->width_flags = 1 << 7;
1267 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1268 isi->width_flags |= 1 << 9;
1270 irq = platform_get_irq(pdev, 0);
1276 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1278 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1283 ret = isi_graph_init(isi);
1287 pm_suspend_ignore_children(&pdev->dev, true);
1288 pm_runtime_enable(&pdev->dev);
1289 platform_set_drvdata(pdev, isi);
1294 dma_free_coherent(&pdev->dev,
1295 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1296 isi->p_fb_descriptors,
1297 isi->fb_descriptors_phys);
1300 video_device_release(isi->vdev);
1302 v4l2_device_unregister(&isi->v4l2_dev);
1307 static int atmel_isi_remove(struct platform_device *pdev)
1309 struct atmel_isi *isi = platform_get_drvdata(pdev);
1311 dma_free_coherent(&pdev->dev,
1312 sizeof(struct fbd) * VIDEO_MAX_FRAME,
1313 isi->p_fb_descriptors,
1314 isi->fb_descriptors_phys);
1315 pm_runtime_disable(&pdev->dev);
1316 v4l2_async_notifier_unregister(&isi->notifier);
1317 v4l2_async_notifier_cleanup(&isi->notifier);
1318 v4l2_device_unregister(&isi->v4l2_dev);
1324 static int atmel_isi_runtime_suspend(struct device *dev)
1326 struct atmel_isi *isi = dev_get_drvdata(dev);
1328 clk_disable_unprepare(isi->pclk);
1332 static int atmel_isi_runtime_resume(struct device *dev)
1334 struct atmel_isi *isi = dev_get_drvdata(dev);
1336 return clk_prepare_enable(isi->pclk);
1338 #endif /* CONFIG_PM */
1340 static const struct dev_pm_ops atmel_isi_dev_pm_ops = {
1341 SET_RUNTIME_PM_OPS(atmel_isi_runtime_suspend,
1342 atmel_isi_runtime_resume, NULL)
1345 static const struct of_device_id atmel_isi_of_match[] = {
1346 { .compatible = "atmel,at91sam9g45-isi" },
1349 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1351 static struct platform_driver atmel_isi_driver = {
1353 .name = "atmel_isi",
1354 .of_match_table = of_match_ptr(atmel_isi_of_match),
1355 .pm = &atmel_isi_dev_pm_ops,
1357 .probe = atmel_isi_probe,
1358 .remove = atmel_isi_remove,
1361 module_platform_driver(atmel_isi_driver);
1363 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1364 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1365 MODULE_LICENSE("GPL");