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;
93 /* ISI peripherial clock */
95 /* ISI_MCK, feed to camera sensor to generate pixel clock */
99 struct isi_platform_data *pdata;
100 u16 width_flags; /* max 12 bits */
102 struct list_head video_buffer_list;
103 struct frame_buffer *active;
105 struct soc_camera_device *icd;
106 struct soc_camera_host soc_host;
109 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
111 writel(val, isi->regs + reg);
113 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
115 return readl(isi->regs + reg);
118 static int configure_geometry(struct atmel_isi *isi, u32 width,
119 u32 height, enum v4l2_mbus_pixelcode code)
124 /* YUV, including grey */
125 case V4L2_MBUS_FMT_Y8_1X8:
126 cr = ISI_CFG2_GRAYSCALE;
128 case V4L2_MBUS_FMT_UYVY8_2X8:
129 cr = ISI_CFG2_YCC_SWAP_MODE_3;
131 case V4L2_MBUS_FMT_VYUY8_2X8:
132 cr = ISI_CFG2_YCC_SWAP_MODE_2;
134 case V4L2_MBUS_FMT_YUYV8_2X8:
135 cr = ISI_CFG2_YCC_SWAP_MODE_1;
137 case V4L2_MBUS_FMT_YVYU8_2X8:
138 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
145 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
147 cfg2 = isi_readl(isi, ISI_CFG2);
150 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
151 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
152 ISI_CFG2_IM_HSIZE_MASK;
154 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
155 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
156 & ISI_CFG2_IM_VSIZE_MASK;
157 isi_writel(isi, ISI_CFG2, cfg2);
162 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
165 struct vb2_buffer *vb = &isi->active->vb;
166 struct frame_buffer *buf = isi->active;
168 list_del_init(&buf->list);
169 do_gettimeofday(&vb->v4l2_buf.timestamp);
170 vb->v4l2_buf.sequence = isi->sequence++;
171 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
174 if (list_empty(&isi->video_buffer_list)) {
177 /* start next dma frame. */
178 isi->active = list_entry(isi->video_buffer_list.next,
179 struct frame_buffer, list);
180 isi_writel(isi, ISI_DMA_C_DSCR,
181 isi->active->p_dma_desc->fbd_phys);
182 isi_writel(isi, ISI_DMA_C_CTRL,
183 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
184 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
189 /* ISI interrupt service routine */
190 static irqreturn_t isi_interrupt(int irq, void *dev_id)
192 struct atmel_isi *isi = dev_id;
193 u32 status, mask, pending;
194 irqreturn_t ret = IRQ_NONE;
196 spin_lock(&isi->lock);
198 status = isi_readl(isi, ISI_STATUS);
199 mask = isi_readl(isi, ISI_INTMASK);
200 pending = status & mask;
202 if (pending & ISI_CTRL_SRST) {
203 complete(&isi->complete);
204 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
206 } else if (pending & ISI_CTRL_DIS) {
207 complete(&isi->complete);
208 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
211 if ((pending & ISI_SR_VSYNC) &&
212 (isi->state == ISI_STATE_IDLE)) {
213 isi->state = ISI_STATE_READY;
214 wake_up_interruptible(&isi->vsync_wq);
217 if (likely(pending & ISI_SR_CXFR_DONE))
218 ret = atmel_isi_handle_streaming(isi);
221 spin_unlock(&isi->lock);
225 #define WAIT_ISI_RESET 1
226 #define WAIT_ISI_DISABLE 0
227 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
229 unsigned long timeout;
231 * The reset or disable will only succeed if we have a
232 * pixel clock from the camera.
234 init_completion(&isi->complete);
237 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
238 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
240 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
241 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
244 timeout = wait_for_completion_timeout(&isi->complete,
245 msecs_to_jiffies(100));
252 /* ------------------------------------------------------------------
254 ------------------------------------------------------------------*/
255 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
256 unsigned int *nbuffers, unsigned int *nplanes,
257 unsigned int sizes[], void *alloc_ctxs[])
259 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
260 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
261 struct atmel_isi *isi = ici->priv;
266 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
268 dev_err(icd->parent, "Reset ISI timed out\n");
271 /* Disable all interrupts */
272 isi_writel(isi, ISI_INTDIS, ~0UL);
274 size = icd->sizeimage;
276 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
277 *nbuffers = MAX_BUFFER_NUM;
279 if (size * *nbuffers > VID_LIMIT_BYTES)
280 *nbuffers = VID_LIMIT_BYTES / size;
284 alloc_ctxs[0] = isi->alloc_ctx;
289 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
295 static int buffer_init(struct vb2_buffer *vb)
297 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
299 buf->p_dma_desc = NULL;
300 INIT_LIST_HEAD(&buf->list);
305 static int buffer_prepare(struct vb2_buffer *vb)
307 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
308 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
309 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
310 struct atmel_isi *isi = ici->priv;
312 struct isi_dma_desc *desc;
314 size = icd->sizeimage;
316 if (vb2_plane_size(vb, 0) < size) {
317 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
318 __func__, vb2_plane_size(vb, 0), size);
322 vb2_set_plane_payload(&buf->vb, 0, size);
324 if (!buf->p_dma_desc) {
325 if (list_empty(&isi->dma_desc_head)) {
326 dev_err(icd->parent, "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 soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
350 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
351 struct atmel_isi *isi = ici->priv;
352 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
354 /* This descriptor is available now and we add to head list */
356 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
359 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
363 cfg1 = isi_readl(isi, ISI_CFG1);
364 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
365 isi_writel(isi, ISI_INTEN,
366 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
368 /* Check if already in a frame */
369 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
370 dev_err(isi->icd->parent, "Already in frame handling.\n");
374 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
375 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
376 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
378 /* Enable linked list */
379 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
381 /* Enable codec path and ISI */
382 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
383 isi_writel(isi, ISI_CTRL, ctrl);
384 isi_writel(isi, ISI_CFG1, cfg1);
387 static void buffer_queue(struct vb2_buffer *vb)
389 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 struct atmel_isi *isi = ici->priv;
392 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
393 unsigned long flags = 0;
395 spin_lock_irqsave(&isi->lock, flags);
396 list_add_tail(&buf->list, &isi->video_buffer_list);
398 if (isi->active == NULL) {
400 if (vb2_is_streaming(vb->vb2_queue))
403 spin_unlock_irqrestore(&isi->lock, flags);
406 static int start_streaming(struct vb2_queue *vq, unsigned int count)
408 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
409 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
410 struct atmel_isi *isi = ici->priv;
415 spin_lock_irq(&isi->lock);
416 isi->state = ISI_STATE_IDLE;
417 /* Clear any pending SOF interrupt */
418 sr = isi_readl(isi, ISI_STATUS);
419 /* Enable VSYNC interrupt for SOF */
420 isi_writel(isi, ISI_INTEN, ISI_SR_VSYNC);
421 isi_writel(isi, ISI_CTRL, ISI_CTRL_EN);
422 spin_unlock_irq(&isi->lock);
424 dev_dbg(icd->parent, "Waiting for SOF\n");
425 ret = wait_event_interruptible(isi->vsync_wq,
426 isi->state != ISI_STATE_IDLE);
430 if (isi->state != ISI_STATE_READY) {
435 spin_lock_irq(&isi->lock);
436 isi->state = ISI_STATE_WAIT_SOF;
437 isi_writel(isi, ISI_INTDIS, ISI_SR_VSYNC);
439 start_dma(isi, isi->active);
440 spin_unlock_irq(&isi->lock);
446 INIT_LIST_HEAD(&isi->video_buffer_list);
450 /* abort streaming and wait for last buffer */
451 static int stop_streaming(struct vb2_queue *vq)
453 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
454 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
455 struct atmel_isi *isi = ici->priv;
456 struct frame_buffer *buf, *node;
458 unsigned long timeout;
460 spin_lock_irq(&isi->lock);
462 /* Release all active buffers */
463 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
464 list_del_init(&buf->list);
465 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
467 spin_unlock_irq(&isi->lock);
469 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
470 /* Wait until the end of the current frame. */
471 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
472 time_before(jiffies, timeout))
475 if (time_after(jiffies, timeout)) {
477 "Timeout waiting for finishing codec request\n");
481 /* Disable interrupts */
482 isi_writel(isi, ISI_INTDIS,
483 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
485 /* Disable ISI and wait for it is done */
486 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
488 dev_err(icd->parent, "Disable ISI timed out\n");
493 static struct vb2_ops isi_video_qops = {
494 .queue_setup = queue_setup,
495 .buf_init = buffer_init,
496 .buf_prepare = buffer_prepare,
497 .buf_cleanup = buffer_cleanup,
498 .buf_queue = buffer_queue,
499 .start_streaming = start_streaming,
500 .stop_streaming = stop_streaming,
501 .wait_prepare = soc_camera_unlock,
502 .wait_finish = soc_camera_lock,
505 /* ------------------------------------------------------------------
506 SOC camera operations for the device
507 ------------------------------------------------------------------*/
508 static int isi_camera_init_videobuf(struct vb2_queue *q,
509 struct soc_camera_device *icd)
511 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
512 q->io_modes = VB2_MMAP;
514 q->buf_struct_size = sizeof(struct frame_buffer);
515 q->ops = &isi_video_qops;
516 q->mem_ops = &vb2_dma_contig_memops;
518 return vb2_queue_init(q);
521 static int isi_camera_set_fmt(struct soc_camera_device *icd,
522 struct v4l2_format *f)
524 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
525 struct atmel_isi *isi = ici->priv;
526 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
527 const struct soc_camera_format_xlate *xlate;
528 struct v4l2_pix_format *pix = &f->fmt.pix;
529 struct v4l2_mbus_framefmt mf;
532 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
534 dev_warn(icd->parent, "Format %x not found\n",
539 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
540 pix->width, pix->height);
542 mf.width = pix->width;
543 mf.height = pix->height;
544 mf.field = pix->field;
545 mf.colorspace = pix->colorspace;
546 mf.code = xlate->code;
548 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
552 if (mf.code != xlate->code)
555 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
559 pix->width = mf.width;
560 pix->height = mf.height;
561 pix->field = mf.field;
562 pix->colorspace = mf.colorspace;
563 icd->current_fmt = xlate;
565 dev_dbg(icd->parent, "Finally set format %dx%d\n",
566 pix->width, pix->height);
571 static int isi_camera_try_fmt(struct soc_camera_device *icd,
572 struct v4l2_format *f)
574 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
575 const struct soc_camera_format_xlate *xlate;
576 struct v4l2_pix_format *pix = &f->fmt.pix;
577 struct v4l2_mbus_framefmt mf;
578 u32 pixfmt = pix->pixelformat;
581 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
582 if (pixfmt && !xlate) {
583 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
587 /* limit to Atmel ISI hardware capabilities */
588 if (pix->height > MAX_SUPPORT_HEIGHT)
589 pix->height = MAX_SUPPORT_HEIGHT;
590 if (pix->width > MAX_SUPPORT_WIDTH)
591 pix->width = MAX_SUPPORT_WIDTH;
593 /* limit to sensor capabilities */
594 mf.width = pix->width;
595 mf.height = pix->height;
596 mf.field = pix->field;
597 mf.colorspace = pix->colorspace;
598 mf.code = xlate->code;
600 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
604 pix->width = mf.width;
605 pix->height = mf.height;
606 pix->colorspace = mf.colorspace;
610 pix->field = V4L2_FIELD_NONE;
612 case V4L2_FIELD_NONE:
615 dev_err(icd->parent, "Field type %d unsupported.\n",
623 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
625 .fourcc = V4L2_PIX_FMT_YUYV,
626 .name = "Packed YUV422 16 bit",
627 .bits_per_sample = 8,
628 .packing = SOC_MBUS_PACKING_2X8_PADHI,
629 .order = SOC_MBUS_ORDER_LE,
630 .layout = SOC_MBUS_LAYOUT_PACKED,
634 /* This will be corrected as we get more formats */
635 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
637 return fmt->packing == SOC_MBUS_PACKING_NONE ||
638 (fmt->bits_per_sample == 8 &&
639 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
640 (fmt->bits_per_sample > 8 &&
641 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
644 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
645 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
646 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
647 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
648 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
649 V4L2_MBUS_PCLK_SAMPLE_RISING | \
650 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
651 V4L2_MBUS_DATA_ACTIVE_HIGH)
653 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
654 unsigned char buswidth)
656 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
657 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
658 struct atmel_isi *isi = ici->priv;
659 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
660 unsigned long common_flags;
663 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
665 common_flags = soc_mbus_config_compatible(&cfg,
668 dev_warn(icd->parent,
669 "Flags incompatible: camera 0x%x, host 0x%x\n",
670 cfg.flags, ISI_BUS_PARAM);
673 } else if (ret != -ENOIOCTLCMD) {
677 if ((1 << (buswidth - 1)) & isi->width_flags)
683 static int isi_camera_get_formats(struct soc_camera_device *icd,
685 struct soc_camera_format_xlate *xlate)
687 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
688 int formats = 0, ret;
690 enum v4l2_mbus_pixelcode code;
691 /* soc camera host format */
692 const struct soc_mbus_pixelfmt *fmt;
694 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
696 /* No more formats */
699 fmt = soc_mbus_get_fmtdesc(code);
702 "Invalid format code #%u: %d\n", idx, code);
706 /* This also checks support for the requested bits-per-sample */
707 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
710 "Fail to try the bus parameters.\n");
715 case V4L2_MBUS_FMT_UYVY8_2X8:
716 case V4L2_MBUS_FMT_VYUY8_2X8:
717 case V4L2_MBUS_FMT_YUYV8_2X8:
718 case V4L2_MBUS_FMT_YVYU8_2X8:
721 xlate->host_fmt = &isi_camera_formats[0];
724 dev_dbg(icd->parent, "Providing format %s using code %d\n",
725 isi_camera_formats[0].name, code);
729 if (!isi_camera_packing_supported(fmt))
733 "Providing format %s in pass-through mode\n",
737 /* Generic pass-through */
740 xlate->host_fmt = fmt;
748 /* Called with .video_lock held */
749 static int isi_camera_add_device(struct soc_camera_device *icd)
751 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
752 struct atmel_isi *isi = ici->priv;
758 ret = clk_enable(isi->pclk);
762 ret = clk_enable(isi->mck);
764 clk_disable(isi->pclk);
769 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
773 /* Called with .video_lock held */
774 static void isi_camera_remove_device(struct soc_camera_device *icd)
776 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
777 struct atmel_isi *isi = ici->priv;
779 BUG_ON(icd != isi->icd);
781 clk_disable(isi->mck);
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)
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->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);
915 clk_unprepare(isi->mck);
917 clk_unprepare(isi->pclk);
924 static int __devinit atmel_isi_probe(struct platform_device *pdev)
927 struct atmel_isi *isi;
929 struct resource *regs;
931 struct device *dev = &pdev->dev;
932 struct soc_camera_host *soc_host;
933 struct isi_platform_data *pdata;
935 pdata = dev->platform_data;
936 if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
938 "No config available for Atmel ISI\n");
942 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
946 pclk = clk_get(&pdev->dev, "isi_clk");
948 return PTR_ERR(pclk);
950 ret = clk_prepare(pclk);
952 goto err_clk_prepare_pclk;
954 isi = kzalloc(sizeof(struct atmel_isi), GFP_KERNEL);
957 dev_err(&pdev->dev, "Can't allocate interface!\n");
964 spin_lock_init(&isi->lock);
965 init_waitqueue_head(&isi->vsync_wq);
966 INIT_LIST_HEAD(&isi->video_buffer_list);
967 INIT_LIST_HEAD(&isi->dma_desc_head);
969 /* Get ISI_MCK, provided by programmable clock or external clock */
970 isi->mck = clk_get(dev, "isi_mck");
971 if (IS_ERR(isi->mck)) {
972 dev_err(dev, "Failed to get isi_mck\n");
973 ret = PTR_ERR(isi->mck);
977 ret = clk_prepare(isi->mck);
979 goto err_clk_prepare_mck;
981 /* Set ISI_MCK's frequency, it should be faster than pixel clock */
982 ret = clk_set_rate(isi->mck, pdata->mck_hz);
984 goto err_set_mck_rate;
986 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
987 sizeof(struct fbd) * MAX_BUFFER_NUM,
988 &isi->fb_descriptors_phys,
990 if (!isi->p_fb_descriptors) {
992 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
993 goto err_alloc_descriptors;
996 for (i = 0; i < MAX_BUFFER_NUM; i++) {
997 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
998 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
999 i * sizeof(struct fbd);
1000 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1003 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1004 if (IS_ERR(isi->alloc_ctx)) {
1005 ret = PTR_ERR(isi->alloc_ctx);
1009 isi->regs = ioremap(regs->start, resource_size(regs));
1015 if (pdata->data_width_flags & ISI_DATAWIDTH_8)
1016 isi->width_flags = 1 << 7;
1017 if (pdata->data_width_flags & ISI_DATAWIDTH_10)
1018 isi->width_flags |= 1 << 9;
1020 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1022 irq = platform_get_irq(pdev, 0);
1028 ret = request_irq(irq, isi_interrupt, 0, "isi", isi);
1030 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1035 soc_host = &isi->soc_host;
1036 soc_host->drv_name = "isi-camera";
1037 soc_host->ops = &isi_soc_camera_host_ops;
1038 soc_host->priv = isi;
1039 soc_host->v4l2_dev.dev = &pdev->dev;
1040 soc_host->nr = pdev->id;
1042 ret = soc_camera_host_register(soc_host);
1044 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1045 goto err_register_soc_camera_host;
1049 err_register_soc_camera_host:
1050 free_irq(isi->irq, isi);
1054 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1056 dma_free_coherent(&pdev->dev,
1057 sizeof(struct fbd) * MAX_BUFFER_NUM,
1058 isi->p_fb_descriptors,
1059 isi->fb_descriptors_phys);
1060 err_alloc_descriptors:
1062 clk_unprepare(isi->mck);
1063 err_clk_prepare_mck:
1068 clk_unprepare(pclk);
1069 err_clk_prepare_pclk:
1075 static struct platform_driver atmel_isi_driver = {
1076 .probe = atmel_isi_probe,
1077 .remove = __devexit_p(atmel_isi_remove),
1079 .name = "atmel_isi",
1080 .owner = THIS_MODULE,
1084 static int __init atmel_isi_init_module(void)
1086 return platform_driver_probe(&atmel_isi_driver, &atmel_isi_probe);
1089 static void __exit atmel_isi_exit(void)
1091 platform_driver_unregister(&atmel_isi_driver);
1093 module_init(atmel_isi_init_module);
1094 module_exit(atmel_isi_exit);
1096 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1097 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1098 MODULE_LICENSE("GPL");
1099 MODULE_SUPPORTED_DEVICE("video");