2 * Copyright (c) 2011 Atmel Corporation
3 * Josh Wu, <josh.wu@atmel.com>
5 * Based on previous work by Lars Haring, <lars.haring@atmel.com>
7 * Based on the bttv driver for Bt848 with respective copyright holders
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/clk.h>
15 #include <linux/completion.h>
16 #include <linux/delay.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
23 #include <linux/slab.h>
25 #include <media/atmel-isi.h>
26 #include <media/soc_camera.h>
27 #include <media/soc_mediabus.h>
28 #include <media/v4l2-of.h>
29 #include <media/videobuf2-dma-contig.h>
31 #define MAX_BUFFER_NUM 32
32 #define MAX_SUPPORT_WIDTH 2048
33 #define MAX_SUPPORT_HEIGHT 2048
34 #define VID_LIMIT_BYTES (16 * 1024 * 1024)
35 #define MIN_FRAME_RATE 15
36 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
37 #define ISI_DEFAULT_MCLK_FREQ 25000000
39 /* Frame buffer descriptor */
41 /* Physical address of the frame buffer */
43 /* DMA Control Register(only in HISI2) */
45 /* Physical address of the next fbd */
49 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
51 fb_desc->dma_ctrl = ctrl;
55 struct list_head list;
60 /* Frame buffer data */
63 struct isi_dma_desc *p_dma_desc;
64 struct list_head list;
68 /* Protects the access of variables shared with the ISR */
74 struct vb2_alloc_ctx *alloc_ctx;
76 /* Allocate descriptors for dma buffer use */
77 struct fbd *p_fb_descriptors;
78 dma_addr_t fb_descriptors_phys;
79 struct list_head dma_desc_head;
80 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
82 struct completion complete;
83 /* ISI peripherial clock */
85 /* ISI_MCK, feed to camera sensor to generate pixel clock */
89 struct isi_platform_data pdata;
90 u16 width_flags; /* max 12 bits */
92 struct list_head video_buffer_list;
93 struct frame_buffer *active;
95 struct soc_camera_host soc_host;
98 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
100 writel(val, isi->regs + reg);
102 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
104 return readl(isi->regs + reg);
107 static int configure_geometry(struct atmel_isi *isi, u32 width,
108 u32 height, u32 code)
113 /* YUV, including grey */
114 case MEDIA_BUS_FMT_Y8_1X8:
115 cr = ISI_CFG2_GRAYSCALE;
117 case MEDIA_BUS_FMT_VYUY8_2X8:
118 cr = ISI_CFG2_YCC_SWAP_MODE_3;
120 case MEDIA_BUS_FMT_UYVY8_2X8:
121 cr = ISI_CFG2_YCC_SWAP_MODE_2;
123 case MEDIA_BUS_FMT_YVYU8_2X8:
124 cr = ISI_CFG2_YCC_SWAP_MODE_1;
126 case MEDIA_BUS_FMT_YUYV8_2X8:
127 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
134 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
136 cfg2 = isi_readl(isi, ISI_CFG2);
137 /* Set YCC swap mode */
138 cfg2 &= ~ISI_CFG2_YCC_SWAP_MODE_MASK;
141 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
142 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
143 ISI_CFG2_IM_HSIZE_MASK;
145 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
146 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
147 & ISI_CFG2_IM_VSIZE_MASK;
148 isi_writel(isi, ISI_CFG2, cfg2);
153 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
156 struct vb2_buffer *vb = &isi->active->vb;
157 struct frame_buffer *buf = isi->active;
159 list_del_init(&buf->list);
160 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
161 vb->v4l2_buf.sequence = isi->sequence++;
162 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
165 if (list_empty(&isi->video_buffer_list)) {
168 /* start next dma frame. */
169 isi->active = list_entry(isi->video_buffer_list.next,
170 struct frame_buffer, list);
171 isi_writel(isi, ISI_DMA_C_DSCR,
172 (u32)isi->active->p_dma_desc->fbd_phys);
173 isi_writel(isi, ISI_DMA_C_CTRL,
174 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
175 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
180 /* ISI interrupt service routine */
181 static irqreturn_t isi_interrupt(int irq, void *dev_id)
183 struct atmel_isi *isi = dev_id;
184 u32 status, mask, pending;
185 irqreturn_t ret = IRQ_NONE;
187 spin_lock(&isi->lock);
189 status = isi_readl(isi, ISI_STATUS);
190 mask = isi_readl(isi, ISI_INTMASK);
191 pending = status & mask;
193 if (pending & ISI_CTRL_SRST) {
194 complete(&isi->complete);
195 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
197 } else if (pending & ISI_CTRL_DIS) {
198 complete(&isi->complete);
199 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
202 if (likely(pending & ISI_SR_CXFR_DONE))
203 ret = atmel_isi_handle_streaming(isi);
206 spin_unlock(&isi->lock);
210 #define WAIT_ISI_RESET 1
211 #define WAIT_ISI_DISABLE 0
212 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
214 unsigned long timeout;
216 * The reset or disable will only succeed if we have a
217 * pixel clock from the camera.
219 init_completion(&isi->complete);
222 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
223 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
225 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
226 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
229 timeout = wait_for_completion_timeout(&isi->complete,
230 msecs_to_jiffies(100));
237 /* ------------------------------------------------------------------
239 ------------------------------------------------------------------*/
240 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
241 unsigned int *nbuffers, unsigned int *nplanes,
242 unsigned int sizes[], void *alloc_ctxs[])
244 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
245 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
246 struct atmel_isi *isi = ici->priv;
249 size = icd->sizeimage;
251 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
252 *nbuffers = MAX_BUFFER_NUM;
254 if (size * *nbuffers > VID_LIMIT_BYTES)
255 *nbuffers = VID_LIMIT_BYTES / size;
259 alloc_ctxs[0] = isi->alloc_ctx;
264 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
270 static int buffer_init(struct vb2_buffer *vb)
272 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
274 buf->p_dma_desc = NULL;
275 INIT_LIST_HEAD(&buf->list);
280 static int buffer_prepare(struct vb2_buffer *vb)
282 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
283 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
284 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
285 struct atmel_isi *isi = ici->priv;
287 struct isi_dma_desc *desc;
289 size = icd->sizeimage;
291 if (vb2_plane_size(vb, 0) < size) {
292 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
293 __func__, vb2_plane_size(vb, 0), size);
297 vb2_set_plane_payload(&buf->vb, 0, size);
299 if (!buf->p_dma_desc) {
300 if (list_empty(&isi->dma_desc_head)) {
301 dev_err(icd->parent, "Not enough dma descriptors.\n");
304 /* Get an available descriptor */
305 desc = list_entry(isi->dma_desc_head.next,
306 struct isi_dma_desc, list);
307 /* Delete the descriptor since now it is used */
308 list_del_init(&desc->list);
310 /* Initialize the dma descriptor */
311 desc->p_fbd->fb_address =
312 vb2_dma_contig_plane_dma_addr(vb, 0);
313 desc->p_fbd->next_fbd_address = 0;
314 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
316 buf->p_dma_desc = desc;
322 static void buffer_cleanup(struct vb2_buffer *vb)
324 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
325 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
326 struct atmel_isi *isi = ici->priv;
327 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
329 /* This descriptor is available now and we add to head list */
331 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
334 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
338 cfg1 = isi_readl(isi, ISI_CFG1);
339 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
340 isi_writel(isi, ISI_INTEN,
341 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
343 /* Check if already in a frame */
344 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
345 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n");
349 isi_writel(isi, ISI_DMA_C_DSCR, (u32)buffer->p_dma_desc->fbd_phys);
350 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
351 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
353 cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
354 /* Enable linked list */
355 cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
357 /* Enable codec path and ISI */
358 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
359 isi_writel(isi, ISI_CTRL, ctrl);
360 isi_writel(isi, ISI_CFG1, cfg1);
363 static void buffer_queue(struct vb2_buffer *vb)
365 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
366 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
367 struct atmel_isi *isi = ici->priv;
368 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
369 unsigned long flags = 0;
371 spin_lock_irqsave(&isi->lock, flags);
372 list_add_tail(&buf->list, &isi->video_buffer_list);
374 if (isi->active == NULL) {
376 if (vb2_is_streaming(vb->vb2_queue))
379 spin_unlock_irqrestore(&isi->lock, flags);
382 static int start_streaming(struct vb2_queue *vq, unsigned int count)
384 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
385 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
386 struct atmel_isi *isi = ici->priv;
390 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
392 dev_err(icd->parent, "Reset ISI timed out\n");
395 /* Disable all interrupts */
396 isi_writel(isi, ISI_INTDIS, (u32)~0UL);
398 spin_lock_irq(&isi->lock);
399 /* Clear any pending interrupt */
400 isi_readl(isi, ISI_STATUS);
403 start_dma(isi, isi->active);
404 spin_unlock_irq(&isi->lock);
409 /* abort streaming and wait for last buffer */
410 static void stop_streaming(struct vb2_queue *vq)
412 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
413 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
414 struct atmel_isi *isi = ici->priv;
415 struct frame_buffer *buf, *node;
417 unsigned long timeout;
419 spin_lock_irq(&isi->lock);
421 /* Release all active buffers */
422 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
423 list_del_init(&buf->list);
424 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
426 spin_unlock_irq(&isi->lock);
428 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
429 /* Wait until the end of the current frame. */
430 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
431 time_before(jiffies, timeout))
434 if (time_after(jiffies, timeout)) {
436 "Timeout waiting for finishing codec request\n");
440 /* Disable interrupts */
441 isi_writel(isi, ISI_INTDIS,
442 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
444 /* Disable ISI and wait for it is done */
445 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
447 dev_err(icd->parent, "Disable ISI timed out\n");
450 static struct vb2_ops isi_video_qops = {
451 .queue_setup = queue_setup,
452 .buf_init = buffer_init,
453 .buf_prepare = buffer_prepare,
454 .buf_cleanup = buffer_cleanup,
455 .buf_queue = buffer_queue,
456 .start_streaming = start_streaming,
457 .stop_streaming = stop_streaming,
458 .wait_prepare = vb2_ops_wait_prepare,
459 .wait_finish = vb2_ops_wait_finish,
462 /* ------------------------------------------------------------------
463 SOC camera operations for the device
464 ------------------------------------------------------------------*/
465 static int isi_camera_init_videobuf(struct vb2_queue *q,
466 struct soc_camera_device *icd)
468 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
470 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
471 q->io_modes = VB2_MMAP;
473 q->buf_struct_size = sizeof(struct frame_buffer);
474 q->ops = &isi_video_qops;
475 q->mem_ops = &vb2_dma_contig_memops;
476 q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
477 q->lock = &ici->host_lock;
479 return vb2_queue_init(q);
482 static int isi_camera_set_fmt(struct soc_camera_device *icd,
483 struct v4l2_format *f)
485 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
486 struct atmel_isi *isi = ici->priv;
487 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
488 const struct soc_camera_format_xlate *xlate;
489 struct v4l2_pix_format *pix = &f->fmt.pix;
490 struct v4l2_subdev_format format = {
491 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
493 struct v4l2_mbus_framefmt *mf = &format.format;
496 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
498 dev_warn(icd->parent, "Format %x not found\n",
503 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
504 pix->width, pix->height);
506 mf->width = pix->width;
507 mf->height = pix->height;
508 mf->field = pix->field;
509 mf->colorspace = pix->colorspace;
510 mf->code = xlate->code;
512 ret = v4l2_subdev_call(sd, pad, set_fmt, NULL, &format);
516 if (mf->code != xlate->code)
519 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
523 pix->width = mf->width;
524 pix->height = mf->height;
525 pix->field = mf->field;
526 pix->colorspace = mf->colorspace;
527 icd->current_fmt = xlate;
529 dev_dbg(icd->parent, "Finally set format %dx%d\n",
530 pix->width, pix->height);
535 static int isi_camera_try_fmt(struct soc_camera_device *icd,
536 struct v4l2_format *f)
538 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
539 const struct soc_camera_format_xlate *xlate;
540 struct v4l2_pix_format *pix = &f->fmt.pix;
541 struct v4l2_subdev_pad_config pad_cfg;
542 struct v4l2_subdev_format format = {
543 .which = V4L2_SUBDEV_FORMAT_TRY,
545 struct v4l2_mbus_framefmt *mf = &format.format;
546 u32 pixfmt = pix->pixelformat;
549 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
550 if (pixfmt && !xlate) {
551 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
555 /* limit to Atmel ISI hardware capabilities */
556 if (pix->height > MAX_SUPPORT_HEIGHT)
557 pix->height = MAX_SUPPORT_HEIGHT;
558 if (pix->width > MAX_SUPPORT_WIDTH)
559 pix->width = MAX_SUPPORT_WIDTH;
561 /* limit to sensor capabilities */
562 mf->width = pix->width;
563 mf->height = pix->height;
564 mf->field = pix->field;
565 mf->colorspace = pix->colorspace;
566 mf->code = xlate->code;
568 ret = v4l2_subdev_call(sd, pad, set_fmt, &pad_cfg, &format);
572 pix->width = mf->width;
573 pix->height = mf->height;
574 pix->colorspace = mf->colorspace;
578 pix->field = V4L2_FIELD_NONE;
580 case V4L2_FIELD_NONE:
583 dev_err(icd->parent, "Field type %d unsupported.\n",
591 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
593 .fourcc = V4L2_PIX_FMT_YUYV,
594 .name = "Packed YUV422 16 bit",
595 .bits_per_sample = 8,
596 .packing = SOC_MBUS_PACKING_2X8_PADHI,
597 .order = SOC_MBUS_ORDER_LE,
598 .layout = SOC_MBUS_LAYOUT_PACKED,
602 /* This will be corrected as we get more formats */
603 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
605 return fmt->packing == SOC_MBUS_PACKING_NONE ||
606 (fmt->bits_per_sample == 8 &&
607 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
608 (fmt->bits_per_sample > 8 &&
609 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
612 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
613 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
614 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
615 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
616 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
617 V4L2_MBUS_PCLK_SAMPLE_RISING | \
618 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
619 V4L2_MBUS_DATA_ACTIVE_HIGH)
621 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
622 unsigned char buswidth)
624 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
625 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
626 struct atmel_isi *isi = ici->priv;
627 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
628 unsigned long common_flags;
631 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
633 common_flags = soc_mbus_config_compatible(&cfg,
636 dev_warn(icd->parent,
637 "Flags incompatible: camera 0x%x, host 0x%x\n",
638 cfg.flags, ISI_BUS_PARAM);
641 } else if (ret != -ENOIOCTLCMD) {
645 if ((1 << (buswidth - 1)) & isi->width_flags)
651 static int isi_camera_get_formats(struct soc_camera_device *icd,
653 struct soc_camera_format_xlate *xlate)
655 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
656 int formats = 0, ret;
658 struct v4l2_subdev_mbus_code_enum code = {
659 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
662 /* soc camera host format */
663 const struct soc_mbus_pixelfmt *fmt;
665 ret = v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
667 /* No more formats */
670 fmt = soc_mbus_get_fmtdesc(code.code);
673 "Invalid format code #%u: %d\n", idx, code.code);
677 /* This also checks support for the requested bits-per-sample */
678 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
681 "Fail to try the bus parameters.\n");
686 case MEDIA_BUS_FMT_UYVY8_2X8:
687 case MEDIA_BUS_FMT_VYUY8_2X8:
688 case MEDIA_BUS_FMT_YUYV8_2X8:
689 case MEDIA_BUS_FMT_YVYU8_2X8:
692 xlate->host_fmt = &isi_camera_formats[0];
693 xlate->code = code.code;
695 dev_dbg(icd->parent, "Providing format %s using code %d\n",
696 isi_camera_formats[0].name, code.code);
700 if (!isi_camera_packing_supported(fmt))
704 "Providing format %s in pass-through mode\n",
708 /* Generic pass-through */
711 xlate->host_fmt = fmt;
712 xlate->code = code.code;
719 static int isi_camera_add_device(struct soc_camera_device *icd)
721 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
727 static void isi_camera_remove_device(struct soc_camera_device *icd)
729 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
733 /* Called with .host_lock held */
734 static int isi_camera_clock_start(struct soc_camera_host *ici)
736 struct atmel_isi *isi = ici->priv;
739 ret = clk_prepare_enable(isi->pclk);
743 if (!IS_ERR(isi->mck)) {
744 ret = clk_prepare_enable(isi->mck);
746 clk_disable_unprepare(isi->pclk);
754 /* Called with .host_lock held */
755 static void isi_camera_clock_stop(struct soc_camera_host *ici)
757 struct atmel_isi *isi = ici->priv;
759 if (!IS_ERR(isi->mck))
760 clk_disable_unprepare(isi->mck);
761 clk_disable_unprepare(isi->pclk);
764 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
766 struct soc_camera_device *icd = file->private_data;
768 return vb2_poll(&icd->vb2_vidq, file, pt);
771 static int isi_camera_querycap(struct soc_camera_host *ici,
772 struct v4l2_capability *cap)
774 strcpy(cap->driver, "atmel-isi");
775 strcpy(cap->card, "Atmel Image Sensor Interface");
776 cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
777 cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
782 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
784 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
785 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
786 struct atmel_isi *isi = ici->priv;
787 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
788 unsigned long common_flags;
792 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
794 common_flags = soc_mbus_config_compatible(&cfg,
797 dev_warn(icd->parent,
798 "Flags incompatible: camera 0x%x, host 0x%x\n",
799 cfg.flags, ISI_BUS_PARAM);
802 } else if (ret != -ENOIOCTLCMD) {
805 common_flags = ISI_BUS_PARAM;
807 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
808 cfg.flags, ISI_BUS_PARAM, common_flags);
810 /* Make choises, based on platform preferences */
811 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
812 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
813 if (isi->pdata.hsync_act_low)
814 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
816 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
819 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
820 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
821 if (isi->pdata.vsync_act_low)
822 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
824 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
827 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
828 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
829 if (isi->pdata.pclk_act_falling)
830 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
832 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
835 cfg.flags = common_flags;
836 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
837 if (ret < 0 && ret != -ENOIOCTLCMD) {
838 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
843 /* set bus param for ISI */
844 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
845 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
846 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
847 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
848 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
849 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
851 if (isi->pdata.has_emb_sync)
852 cfg1 |= ISI_CFG1_EMB_SYNC;
853 if (isi->pdata.full_mode)
854 cfg1 |= ISI_CFG1_FULL_MODE;
856 cfg1 |= ISI_CFG1_THMASK_BEATS_16;
858 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
859 isi_writel(isi, ISI_CFG1, cfg1);
864 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
865 .owner = THIS_MODULE,
866 .add = isi_camera_add_device,
867 .remove = isi_camera_remove_device,
868 .clock_start = isi_camera_clock_start,
869 .clock_stop = isi_camera_clock_stop,
870 .set_fmt = isi_camera_set_fmt,
871 .try_fmt = isi_camera_try_fmt,
872 .get_formats = isi_camera_get_formats,
873 .init_videobuf2 = isi_camera_init_videobuf,
874 .poll = isi_camera_poll,
875 .querycap = isi_camera_querycap,
876 .set_bus_param = isi_camera_set_bus_param,
879 /* -----------------------------------------------------------------------*/
880 static int atmel_isi_remove(struct platform_device *pdev)
882 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
883 struct atmel_isi *isi = container_of(soc_host,
884 struct atmel_isi, soc_host);
886 soc_camera_host_unregister(soc_host);
887 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
888 dma_free_coherent(&pdev->dev,
889 sizeof(struct fbd) * MAX_BUFFER_NUM,
890 isi->p_fb_descriptors,
891 isi->fb_descriptors_phys);
896 static int atmel_isi_probe_dt(struct atmel_isi *isi,
897 struct platform_device *pdev)
899 struct device_node *np= pdev->dev.of_node;
900 struct v4l2_of_endpoint ep;
903 /* Default settings for ISI */
904 isi->pdata.full_mode = 1;
905 isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ;
906 isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
908 np = of_graph_get_next_endpoint(np, NULL);
910 dev_err(&pdev->dev, "Could not find the endpoint\n");
914 err = v4l2_of_parse_endpoint(np, &ep);
916 dev_err(&pdev->dev, "Could not parse the endpoint\n");
920 switch (ep.bus.parallel.bus_width) {
922 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
925 isi->pdata.data_width_flags =
926 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
929 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
930 ep.bus.parallel.bus_width);
941 static int atmel_isi_probe(struct platform_device *pdev)
944 struct atmel_isi *isi;
945 struct resource *regs;
947 struct device *dev = &pdev->dev;
948 struct soc_camera_host *soc_host;
949 struct isi_platform_data *pdata;
951 pdata = dev->platform_data;
952 if ((!pdata || !pdata->data_width_flags) && !pdev->dev.of_node) {
954 "No config available for Atmel ISI\n");
958 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
960 dev_err(&pdev->dev, "Can't allocate interface!\n");
964 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
965 if (IS_ERR(isi->pclk))
966 return PTR_ERR(isi->pclk);
969 memcpy(&isi->pdata, pdata, sizeof(isi->pdata));
971 ret = atmel_isi_probe_dt(isi, pdev);
977 spin_lock_init(&isi->lock);
978 INIT_LIST_HEAD(&isi->video_buffer_list);
979 INIT_LIST_HEAD(&isi->dma_desc_head);
981 /* ISI_MCK is the sensor master clock. It should be handled by the
982 * sensor driver directly, as the ISI has no use for that clock. Make
983 * the clock optional here while platforms transition to the correct
986 isi->mck = devm_clk_get(dev, "isi_mck");
987 if (!IS_ERR(isi->mck)) {
988 /* Set ISI_MCK's frequency, it should be faster than pixel
991 ret = clk_set_rate(isi->mck, isi->pdata.mck_hz);
996 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
997 sizeof(struct fbd) * MAX_BUFFER_NUM,
998 &isi->fb_descriptors_phys,
1000 if (!isi->p_fb_descriptors) {
1001 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
1005 for (i = 0; i < MAX_BUFFER_NUM; i++) {
1006 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
1007 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
1008 i * sizeof(struct fbd);
1009 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1012 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1013 if (IS_ERR(isi->alloc_ctx)) {
1014 ret = PTR_ERR(isi->alloc_ctx);
1018 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1019 isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1020 if (IS_ERR(isi->regs)) {
1021 ret = PTR_ERR(isi->regs);
1025 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1026 isi->width_flags = 1 << 7;
1027 if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1028 isi->width_flags |= 1 << 9;
1030 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1032 irq = platform_get_irq(pdev, 0);
1033 if (IS_ERR_VALUE(irq)) {
1038 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1040 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1045 soc_host = &isi->soc_host;
1046 soc_host->drv_name = "isi-camera";
1047 soc_host->ops = &isi_soc_camera_host_ops;
1048 soc_host->priv = isi;
1049 soc_host->v4l2_dev.dev = &pdev->dev;
1050 soc_host->nr = pdev->id;
1052 if (isi->pdata.asd_sizes) {
1053 soc_host->asd = isi->pdata.asd;
1054 soc_host->asd_sizes = isi->pdata.asd_sizes;
1057 ret = soc_camera_host_register(soc_host);
1059 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1060 goto err_register_soc_camera_host;
1064 err_register_soc_camera_host:
1067 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1069 dma_free_coherent(&pdev->dev,
1070 sizeof(struct fbd) * MAX_BUFFER_NUM,
1071 isi->p_fb_descriptors,
1072 isi->fb_descriptors_phys);
1077 static const struct of_device_id atmel_isi_of_match[] = {
1078 { .compatible = "atmel,at91sam9g45-isi" },
1081 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1083 static struct platform_driver atmel_isi_driver = {
1084 .remove = atmel_isi_remove,
1086 .name = "atmel_isi",
1087 .of_match_table = of_match_ptr(atmel_isi_of_match),
1091 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1093 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1094 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1095 MODULE_LICENSE("GPL");
1096 MODULE_SUPPORTED_DEVICE("video");