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/videobuf2-dma-contig.h>
30 #define MAX_BUFFER_NUM 32
31 #define MAX_SUPPORT_WIDTH 2048
32 #define MAX_SUPPORT_HEIGHT 2048
33 #define VID_LIMIT_BYTES (16 * 1024 * 1024)
34 #define MIN_FRAME_RATE 15
35 #define FRAME_INTERVAL_MILLI_SEC (1000 / MIN_FRAME_RATE)
44 /* Frame buffer descriptor */
46 /* Physical address of the frame buffer */
48 /* DMA Control Register(only in HISI2) */
50 /* Physical address of the next fbd */
54 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
56 fb_desc->dma_ctrl = ctrl;
60 struct list_head list;
65 /* Frame buffer data */
68 struct isi_dma_desc *p_dma_desc;
69 struct list_head list;
73 /* Protects the access of variables shared with the ISR */
78 /* State of the ISI module in capturing mode */
81 /* Wait queue for waiting for SOF */
82 wait_queue_head_t vsync_wq;
84 struct vb2_alloc_ctx *alloc_ctx;
86 /* Allocate descriptors for dma buffer use */
87 struct fbd *p_fb_descriptors;
88 u32 fb_descriptors_phys;
89 struct list_head dma_desc_head;
90 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
92 struct completion complete;
96 struct isi_platform_data *pdata;
97 u16 width_flags; /* max 12 bits */
99 struct list_head video_buffer_list;
100 struct frame_buffer *active;
102 struct soc_camera_device *icd;
103 struct soc_camera_host soc_host;
106 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
108 writel(val, isi->regs + reg);
110 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
112 return readl(isi->regs + reg);
115 static int configure_geometry(struct atmel_isi *isi, u32 width,
116 u32 height, enum v4l2_mbus_pixelcode code)
121 /* YUV, including grey */
122 case V4L2_MBUS_FMT_Y8_1X8:
123 cr = ISI_CFG2_GRAYSCALE;
125 case V4L2_MBUS_FMT_UYVY8_2X8:
126 cr = ISI_CFG2_YCC_SWAP_MODE_3;
128 case V4L2_MBUS_FMT_VYUY8_2X8:
129 cr = ISI_CFG2_YCC_SWAP_MODE_2;
131 case V4L2_MBUS_FMT_YUYV8_2X8:
132 cr = ISI_CFG2_YCC_SWAP_MODE_1;
134 case V4L2_MBUS_FMT_YVYU8_2X8:
135 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
142 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
144 cfg2 = isi_readl(isi, ISI_CFG2);
147 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
148 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
149 ISI_CFG2_IM_HSIZE_MASK;
151 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
152 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
153 & ISI_CFG2_IM_VSIZE_MASK;
154 isi_writel(isi, ISI_CFG2, cfg2);
159 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
162 struct vb2_buffer *vb = &isi->active->vb;
163 struct frame_buffer *buf = isi->active;
165 list_del_init(&buf->list);
166 do_gettimeofday(&vb->v4l2_buf.timestamp);
167 vb->v4l2_buf.sequence = isi->sequence++;
168 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
171 if (list_empty(&isi->video_buffer_list)) {
174 /* start next dma frame. */
175 isi->active = list_entry(isi->video_buffer_list.next,
176 struct frame_buffer, list);
177 isi_writel(isi, ISI_DMA_C_DSCR,
178 isi->active->p_dma_desc->fbd_phys);
179 isi_writel(isi, ISI_DMA_C_CTRL,
180 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
181 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
186 /* ISI interrupt service routine */
187 static irqreturn_t isi_interrupt(int irq, void *dev_id)
189 struct atmel_isi *isi = dev_id;
190 u32 status, mask, pending;
191 irqreturn_t ret = IRQ_NONE;
193 spin_lock(&isi->lock);
195 status = isi_readl(isi, ISI_STATUS);
196 mask = isi_readl(isi, ISI_INTMASK);
197 pending = status & mask;
199 if (pending & ISI_CTRL_SRST) {
200 complete(&isi->complete);
201 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
203 } else if (pending & ISI_CTRL_DIS) {
204 complete(&isi->complete);
205 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
208 if ((pending & ISI_SR_VSYNC) &&
209 (isi->state == ISI_STATE_IDLE)) {
210 isi->state = ISI_STATE_READY;
211 wake_up_interruptible(&isi->vsync_wq);
214 if (likely(pending & ISI_SR_CXFR_DONE))
215 ret = atmel_isi_handle_streaming(isi);
218 spin_unlock(&isi->lock);
222 #define WAIT_ISI_RESET 1
223 #define WAIT_ISI_DISABLE 0
224 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
226 unsigned long timeout;
228 * The reset or disable will only succeed if we have a
229 * pixel clock from the camera.
231 init_completion(&isi->complete);
234 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
235 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
237 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
238 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
241 timeout = wait_for_completion_timeout(&isi->complete,
242 msecs_to_jiffies(100));
249 /* ------------------------------------------------------------------
251 ------------------------------------------------------------------*/
252 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
253 unsigned int *nbuffers, unsigned int *nplanes,
254 unsigned int sizes[], void *alloc_ctxs[])
256 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
257 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
258 struct atmel_isi *isi = ici->priv;
260 int ret, bytes_per_line;
263 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
265 dev_err(icd->parent, "Reset ISI timed out\n");
268 /* Disable all interrupts */
269 isi_writel(isi, ISI_INTDIS, ~0UL);
271 bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
272 icd->current_fmt->host_fmt);
274 if (bytes_per_line < 0)
275 return bytes_per_line;
277 size = bytes_per_line * icd->user_height;
279 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
280 *nbuffers = MAX_BUFFER_NUM;
282 if (size * *nbuffers > VID_LIMIT_BYTES)
283 *nbuffers = VID_LIMIT_BYTES / size;
287 alloc_ctxs[0] = isi->alloc_ctx;
292 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
298 static int buffer_init(struct vb2_buffer *vb)
300 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
302 buf->p_dma_desc = NULL;
303 INIT_LIST_HEAD(&buf->list);
308 static int buffer_prepare(struct vb2_buffer *vb)
310 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
311 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
312 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
313 struct atmel_isi *isi = ici->priv;
315 struct isi_dma_desc *desc;
316 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
317 icd->current_fmt->host_fmt);
319 if (bytes_per_line < 0)
320 return bytes_per_line;
322 size = bytes_per_line * icd->user_height;
324 if (vb2_plane_size(vb, 0) < size) {
325 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
326 __func__, vb2_plane_size(vb, 0), size);
330 vb2_set_plane_payload(&buf->vb, 0, size);
332 if (!buf->p_dma_desc) {
333 if (list_empty(&isi->dma_desc_head)) {
334 dev_err(icd->parent, "Not enough dma descriptors.\n");
337 /* Get an available descriptor */
338 desc = list_entry(isi->dma_desc_head.next,
339 struct isi_dma_desc, list);
340 /* Delete the descriptor since now it is used */
341 list_del_init(&desc->list);
343 /* Initialize the dma descriptor */
344 desc->p_fbd->fb_address =
345 vb2_dma_contig_plane_dma_addr(vb, 0);
346 desc->p_fbd->next_fbd_address = 0;
347 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
349 buf->p_dma_desc = desc;
355 static void buffer_cleanup(struct vb2_buffer *vb)
357 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
358 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
359 struct atmel_isi *isi = ici->priv;
360 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
362 /* This descriptor is available now and we add to head list */
364 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
367 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
371 cfg1 = isi_readl(isi, ISI_CFG1);
372 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
373 isi_writel(isi, ISI_INTEN,
374 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
376 /* Check if already in a frame */
377 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
378 dev_err(isi->icd->parent, "Already in frame handling.\n");
382 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
383 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
384 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
386 /* Enable linked list */
387 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
389 /* Enable codec path and ISI */
390 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
391 isi_writel(isi, ISI_CTRL, ctrl);
392 isi_writel(isi, ISI_CFG1, cfg1);
395 static void buffer_queue(struct vb2_buffer *vb)
397 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
398 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
399 struct atmel_isi *isi = ici->priv;
400 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
401 unsigned long flags = 0;
403 spin_lock_irqsave(&isi->lock, flags);
404 list_add_tail(&buf->list, &isi->video_buffer_list);
406 if (isi->active == NULL) {
408 if (vb2_is_streaming(vb->vb2_queue))
411 spin_unlock_irqrestore(&isi->lock, flags);
414 static int start_streaming(struct vb2_queue *vq, unsigned int count)
416 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
417 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
418 struct atmel_isi *isi = ici->priv;
423 spin_lock_irq(&isi->lock);
424 isi->state = ISI_STATE_IDLE;
425 /* Clear any pending SOF interrupt */
426 sr = isi_readl(isi, ISI_STATUS);
427 /* Enable VSYNC interrupt for SOF */
428 isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
429 isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
430 spin_unlock_irq(&isi->lock);
432 dev_dbg(icd->parent, "Waiting for SOF\n");
433 ret = wait_event_interruptible(isi->vsync_wq,
434 isi->state != ISI_STATE_IDLE);
438 if (isi->state != ISI_STATE_READY) {
443 spin_lock_irq(&isi->lock);
444 isi->state = ISI_STATE_WAIT_SOF;
445 isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
447 start_dma(isi, isi->active);
448 spin_unlock_irq(&isi->lock);
454 INIT_LIST_HEAD(&isi->video_buffer_list);
458 /* abort streaming and wait for last buffer */
459 static int stop_streaming(struct vb2_queue *vq)
461 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
462 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
463 struct atmel_isi *isi = ici->priv;
464 struct frame_buffer *buf, *node;
466 unsigned long timeout;
468 spin_lock_irq(&isi->lock);
470 /* Release all active buffers */
471 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
472 list_del_init(&buf->list);
473 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
475 spin_unlock_irq(&isi->lock);
477 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
478 /* Wait until the end of the current frame. */
479 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
480 time_before(jiffies, timeout))
483 if (time_after(jiffies, timeout)) {
485 "Timeout waiting for finishing codec request\n");
489 /* Disable interrupts */
490 isi_writel(isi, ISI_INTDIS,
491 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
493 /* Disable ISI and wait for it is done */
494 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
496 dev_err(icd->parent, "Disable ISI timed out\n");
501 static struct vb2_ops isi_video_qops = {
502 .queue_setup = queue_setup,
503 .buf_init = buffer_init,
504 .buf_prepare = buffer_prepare,
505 .buf_cleanup = buffer_cleanup,
506 .buf_queue = buffer_queue,
507 .start_streaming = start_streaming,
508 .stop_streaming = stop_streaming,
509 .wait_prepare = soc_camera_unlock,
510 .wait_finish = soc_camera_lock,
513 /* ------------------------------------------------------------------
514 SOC camera operations for the device
515 ------------------------------------------------------------------*/
516 static int isi_camera_init_videobuf(struct vb2_queue *q,
517 struct soc_camera_device *icd)
519 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
520 q->io_modes = VB2_MMAP;
522 q->buf_struct_size = sizeof(struct frame_buffer);
523 q->ops = &isi_video_qops;
524 q->mem_ops = &vb2_dma_contig_memops;
526 return vb2_queue_init(q);
529 static int isi_camera_set_fmt(struct soc_camera_device *icd,
530 struct v4l2_format *f)
532 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
533 struct atmel_isi *isi = ici->priv;
534 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
535 const struct soc_camera_format_xlate *xlate;
536 struct v4l2_pix_format *pix = &f->fmt.pix;
537 struct v4l2_mbus_framefmt mf;
540 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
542 dev_warn(icd->parent, "Format %x not found\n",
547 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
548 pix->width, pix->height);
550 mf.width = pix->width;
551 mf.height = pix->height;
552 mf.field = pix->field;
553 mf.colorspace = pix->colorspace;
554 mf.code = xlate->code;
556 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
560 if (mf.code != xlate->code)
563 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
567 pix->width = mf.width;
568 pix->height = mf.height;
569 pix->field = mf.field;
570 pix->colorspace = mf.colorspace;
571 icd->current_fmt = xlate;
573 dev_dbg(icd->parent, "Finally set format %dx%d\n",
574 pix->width, pix->height);
579 static int isi_camera_try_fmt(struct soc_camera_device *icd,
580 struct v4l2_format *f)
582 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
583 const struct soc_camera_format_xlate *xlate;
584 struct v4l2_pix_format *pix = &f->fmt.pix;
585 struct v4l2_mbus_framefmt mf;
586 u32 pixfmt = pix->pixelformat;
589 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
590 if (pixfmt && !xlate) {
591 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
595 /* limit to Atmel ISI hardware capabilities */
596 if (pix->height > MAX_SUPPORT_HEIGHT)
597 pix->height = MAX_SUPPORT_HEIGHT;
598 if (pix->width > MAX_SUPPORT_WIDTH)
599 pix->width = MAX_SUPPORT_WIDTH;
601 /* limit to sensor capabilities */
602 mf.width = pix->width;
603 mf.height = pix->height;
604 mf.field = pix->field;
605 mf.colorspace = pix->colorspace;
606 mf.code = xlate->code;
608 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
612 pix->width = mf.width;
613 pix->height = mf.height;
614 pix->colorspace = mf.colorspace;
618 pix->field = V4L2_FIELD_NONE;
620 case V4L2_FIELD_NONE:
623 dev_err(icd->parent, "Field type %d unsupported.\n",
631 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
633 .fourcc = V4L2_PIX_FMT_YUYV,
634 .name = "Packed YUV422 16 bit",
635 .bits_per_sample = 8,
636 .packing = SOC_MBUS_PACKING_2X8_PADHI,
637 .order = SOC_MBUS_ORDER_LE,
641 /* This will be corrected as we get more formats */
642 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
644 return fmt->packing == SOC_MBUS_PACKING_NONE ||
645 (fmt->bits_per_sample == 8 &&
646 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
647 (fmt->bits_per_sample > 8 &&
648 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
651 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
652 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
653 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
654 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
655 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
656 V4L2_MBUS_PCLK_SAMPLE_RISING | \
657 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
658 V4L2_MBUS_DATA_ACTIVE_HIGH)
660 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
661 unsigned char buswidth)
663 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
664 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
665 struct atmel_isi *isi = ici->priv;
666 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
667 unsigned long common_flags;
670 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
672 common_flags = soc_mbus_config_compatible(&cfg,
675 dev_warn(icd->parent,
676 "Flags incompatible: camera 0x%x, host 0x%x\n",
677 cfg.flags, ISI_BUS_PARAM);
680 } else if (ret != -ENOIOCTLCMD) {
684 if ((1 << (buswidth - 1)) & isi->width_flags)
690 static int isi_camera_get_formats(struct soc_camera_device *icd,
692 struct soc_camera_format_xlate *xlate)
694 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
695 int formats = 0, ret;
697 enum v4l2_mbus_pixelcode code;
698 /* soc camera host format */
699 const struct soc_mbus_pixelfmt *fmt;
701 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
703 /* No more formats */
706 fmt = soc_mbus_get_fmtdesc(code);
709 "Invalid format code #%u: %d\n", idx, code);
713 /* This also checks support for the requested bits-per-sample */
714 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
717 "Fail to try the bus parameters.\n");
722 case V4L2_MBUS_FMT_UYVY8_2X8:
723 case V4L2_MBUS_FMT_VYUY8_2X8:
724 case V4L2_MBUS_FMT_YUYV8_2X8:
725 case V4L2_MBUS_FMT_YVYU8_2X8:
728 xlate->host_fmt = &isi_camera_formats[0];
731 dev_dbg(icd->parent, "Providing format %s using code %d\n",
732 isi_camera_formats[0].name, code);
736 if (!isi_camera_packing_supported(fmt))
740 "Providing format %s in pass-through mode\n",
744 /* Generic pass-through */
747 xlate->host_fmt = fmt;
755 /* Called with .video_lock held */
756 static int isi_camera_add_device(struct soc_camera_device *icd)
758 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
759 struct atmel_isi *isi = ici->priv;
765 ret = clk_enable(isi->pclk);
770 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
774 /* Called with .video_lock held */
775 static void isi_camera_remove_device(struct soc_camera_device *icd)
777 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
778 struct atmel_isi *isi = ici->priv;
780 BUG_ON(icd != isi->icd);
782 clk_disable(isi->pclk);
785 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
789 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
791 struct soc_camera_device *icd = file->private_data;
793 return vb2_poll(&icd->vb2_vidq, file, pt);
796 static int isi_camera_querycap(struct soc_camera_host *ici,
797 struct v4l2_capability *cap)
799 strcpy(cap->driver, "atmel-isi");
800 strcpy(cap->card, "Atmel Image Sensor Interface");
801 cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
806 static int isi_camera_set_bus_param(struct soc_camera_device *icd, u32 pixfmt)
808 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
809 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
810 struct atmel_isi *isi = ici->priv;
811 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
812 unsigned long common_flags;
816 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
818 common_flags = soc_mbus_config_compatible(&cfg,
821 dev_warn(icd->parent,
822 "Flags incompatible: camera 0x%x, host 0x%x\n",
823 cfg.flags, ISI_BUS_PARAM);
826 } else if (ret != -ENOIOCTLCMD) {
829 common_flags = ISI_BUS_PARAM;
831 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
832 cfg.flags, ISI_BUS_PARAM, common_flags);
834 /* Make choises, based on platform preferences */
835 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
836 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
837 if (isi->pdata->hsync_act_low)
838 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
840 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
843 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
844 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
845 if (isi->pdata->vsync_act_low)
846 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
848 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
851 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
852 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
853 if (isi->pdata->pclk_act_falling)
854 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
856 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
859 cfg.flags = common_flags;
860 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
861 if (ret < 0 && ret != -ENOIOCTLCMD) {
862 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
867 /* set bus param for ISI */
868 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
869 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
870 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
871 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
872 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
873 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
875 if (isi->pdata->has_emb_sync)
876 cfg1 |= ISI_CFG1_EMB_SYNC;
877 if (isi->pdata->isi_full_mode)
878 cfg1 |= ISI_CFG1_FULL_MODE;
880 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
881 isi_writel(isi, ISI_CFG1, cfg1);
886 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
887 .owner = THIS_MODULE,
888 .add = isi_camera_add_device,
889 .remove = isi_camera_remove_device,
890 .set_fmt = isi_camera_set_fmt,
891 .try_fmt = isi_camera_try_fmt,
892 .get_formats = isi_camera_get_formats,
893 .init_videobuf2 = isi_camera_init_videobuf,
894 .poll = isi_camera_poll,
895 .querycap = isi_camera_querycap,
896 .set_bus_param = isi_camera_set_bus_param,
899 /* -----------------------------------------------------------------------*/
900 static int __devexit atmel_isi_remove(struct platform_device *pdev)
902 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
903 struct atmel_isi *isi = container_of(soc_host,
904 struct atmel_isi, soc_host);
906 free_irq(isi->irq, isi);
907 soc_camera_host_unregister(soc_host);
908 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
909 dma_free_coherent(&pdev->dev,
910 sizeof(struct fbd) * MAX_BUFFER_NUM,
911 isi->p_fb_descriptors,
912 isi->fb_descriptors_phys);
921 static int __devinit atmel_isi_probe(struct platform_device *pdev)
924 struct atmel_isi *isi;
926 struct resource *regs;
928 struct device *dev = &pdev->dev;
929 struct soc_camera_host *soc_host;
930 struct isi_platform_data *pdata;
932 pdata = dev->platform_data;
933 if (!pdata || !pdata->data_width_flags) {
935 "No config available for Atmel ISI\n");
939 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
943 pclk = clk_get(&pdev->dev, "isi_clk");
945 return PTR_ERR(pclk);
947 isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
950 dev_err(&pdev->dev, "Can't allocate interface!\n");
957 spin_lock_init(&isi->lock);
958 init_waitqueue_head(&isi->vsync_wq);
959 INIT_LIST_HEAD(&isi->video_buffer_list);
960 INIT_LIST_HEAD(&isi->dma_desc_head);
962 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
963 sizeof(struct fbd) * MAX_BUFFER_NUM,
964 &isi->fb_descriptors_phys,
966 if (!isi->p_fb_descriptors) {
968 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
969 goto err_alloc_descriptors;
972 for (i = 0; i < MAX_BUFFER_NUM; i++) {
973 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
974 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
975 i * sizeof(struct fbd);
976 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
979 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
980 if (IS_ERR(isi->alloc_ctx)) {
981 ret = PTR_ERR(isi->alloc_ctx);
985 isi->regs = ioremap(regs->start, resource_size(regs));
991 if (pdata->data_width_flags & ISI_DATAWIDTH_8)
992 isi->width_flags = 1 << 7;
993 if (pdata->data_width_flags & ISI_DATAWIDTH_10)
994 isi->width_flags |= 1 << 9;
996 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
998 irq = platform_get_irq(pdev, 0);
1004 ret = request_irq(irq, isi_interrupt, 0, "isi", isi);
1006 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1011 soc_host = &isi->soc_host;
1012 soc_host->drv_name = "isi-camera";
1013 soc_host->ops = &isi_soc_camera_host_ops;
1014 soc_host->priv = isi;
1015 soc_host->v4l2_dev.dev = &pdev->dev;
1016 soc_host->nr = pdev->id;
1018 ret = soc_camera_host_register(soc_host);
1020 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1021 goto err_register_soc_camera_host;
1025 err_register_soc_camera_host:
1026 free_irq(isi->irq, isi);
1030 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1032 dma_free_coherent(&pdev->dev,
1033 sizeof(struct fbd) * MAX_BUFFER_NUM,
1034 isi->p_fb_descriptors,
1035 isi->fb_descriptors_phys);
1036 err_alloc_descriptors:
1044 static struct platform_driver atmel_isi_driver = {
1045 .probe = atmel_isi_probe,
1046 .remove = __devexit_p(atmel_isi_remove),
1048 .name = "atmel_isi",
1049 .owner = THIS_MODULE,
1053 static int __init atmel_isi_init_module(void)
1055 return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe);
1058 static void __exit atmel_isi_exit(void)
1060 platform_driver_unregister(&atmel_isi_driver);
1062 module_init(atmel_isi_init_module);
1063 module_exit(atmel_isi_exit);
1065 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1066 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1067 MODULE_LICENSE("GPL");
1068 MODULE_SUPPORTED_DEVICE("video");