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)
37 /* Frame buffer descriptor */
39 /* Physical address of the frame buffer */
41 /* DMA Control Register(only in HISI2) */
43 /* Physical address of the next fbd */
47 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
49 fb_desc->dma_ctrl = ctrl;
53 struct list_head list;
58 /* Frame buffer data */
61 struct isi_dma_desc *p_dma_desc;
62 struct list_head list;
66 /* Protects the access of variables shared with the ISR */
72 struct vb2_alloc_ctx *alloc_ctx;
74 /* Allocate descriptors for dma buffer use */
75 struct fbd *p_fb_descriptors;
76 u32 fb_descriptors_phys;
77 struct list_head dma_desc_head;
78 struct isi_dma_desc dma_desc[MAX_BUFFER_NUM];
80 struct completion complete;
81 /* ISI peripherial clock */
83 /* ISI_MCK, feed to camera sensor to generate pixel clock */
87 struct isi_platform_data *pdata;
88 u16 width_flags; /* max 12 bits */
90 struct list_head video_buffer_list;
91 struct frame_buffer *active;
93 struct soc_camera_host soc_host;
96 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
98 writel(val, isi->regs + reg);
100 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
102 return readl(isi->regs + reg);
105 static int configure_geometry(struct atmel_isi *isi, u32 width,
106 u32 height, enum v4l2_mbus_pixelcode code)
111 /* YUV, including grey */
112 case V4L2_MBUS_FMT_Y8_1X8:
113 cr = ISI_CFG2_GRAYSCALE;
115 case V4L2_MBUS_FMT_UYVY8_2X8:
116 cr = ISI_CFG2_YCC_SWAP_MODE_3;
118 case V4L2_MBUS_FMT_VYUY8_2X8:
119 cr = ISI_CFG2_YCC_SWAP_MODE_2;
121 case V4L2_MBUS_FMT_YUYV8_2X8:
122 cr = ISI_CFG2_YCC_SWAP_MODE_1;
124 case V4L2_MBUS_FMT_YVYU8_2X8:
125 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
132 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
134 cfg2 = isi_readl(isi, ISI_CFG2);
137 cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
138 cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
139 ISI_CFG2_IM_HSIZE_MASK;
141 cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
142 cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
143 & ISI_CFG2_IM_VSIZE_MASK;
144 isi_writel(isi, ISI_CFG2, cfg2);
149 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
152 struct vb2_buffer *vb = &isi->active->vb;
153 struct frame_buffer *buf = isi->active;
155 list_del_init(&buf->list);
156 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
157 vb->v4l2_buf.sequence = isi->sequence++;
158 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
161 if (list_empty(&isi->video_buffer_list)) {
164 /* start next dma frame. */
165 isi->active = list_entry(isi->video_buffer_list.next,
166 struct frame_buffer, list);
167 isi_writel(isi, ISI_DMA_C_DSCR,
168 isi->active->p_dma_desc->fbd_phys);
169 isi_writel(isi, ISI_DMA_C_CTRL,
170 ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
171 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
176 /* ISI interrupt service routine */
177 static irqreturn_t isi_interrupt(int irq, void *dev_id)
179 struct atmel_isi *isi = dev_id;
180 u32 status, mask, pending;
181 irqreturn_t ret = IRQ_NONE;
183 spin_lock(&isi->lock);
185 status = isi_readl(isi, ISI_STATUS);
186 mask = isi_readl(isi, ISI_INTMASK);
187 pending = status & mask;
189 if (pending & ISI_CTRL_SRST) {
190 complete(&isi->complete);
191 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
193 } else if (pending & ISI_CTRL_DIS) {
194 complete(&isi->complete);
195 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
198 if (likely(pending & ISI_SR_CXFR_DONE))
199 ret = atmel_isi_handle_streaming(isi);
202 spin_unlock(&isi->lock);
206 #define WAIT_ISI_RESET 1
207 #define WAIT_ISI_DISABLE 0
208 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
210 unsigned long timeout;
212 * The reset or disable will only succeed if we have a
213 * pixel clock from the camera.
215 init_completion(&isi->complete);
218 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
219 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
221 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
222 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
225 timeout = wait_for_completion_timeout(&isi->complete,
226 msecs_to_jiffies(100));
233 /* ------------------------------------------------------------------
235 ------------------------------------------------------------------*/
236 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
237 unsigned int *nbuffers, unsigned int *nplanes,
238 unsigned int sizes[], void *alloc_ctxs[])
240 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
241 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
242 struct atmel_isi *isi = ici->priv;
247 ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
249 dev_err(icd->parent, "Reset ISI timed out\n");
252 /* Disable all interrupts */
253 isi_writel(isi, ISI_INTDIS, ~0UL);
255 size = icd->sizeimage;
257 if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
258 *nbuffers = MAX_BUFFER_NUM;
260 if (size * *nbuffers > VID_LIMIT_BYTES)
261 *nbuffers = VID_LIMIT_BYTES / size;
265 alloc_ctxs[0] = isi->alloc_ctx;
270 dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
276 static int buffer_init(struct vb2_buffer *vb)
278 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
280 buf->p_dma_desc = NULL;
281 INIT_LIST_HEAD(&buf->list);
286 static int buffer_prepare(struct vb2_buffer *vb)
288 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
289 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
290 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
291 struct atmel_isi *isi = ici->priv;
293 struct isi_dma_desc *desc;
295 size = icd->sizeimage;
297 if (vb2_plane_size(vb, 0) < size) {
298 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
299 __func__, vb2_plane_size(vb, 0), size);
303 vb2_set_plane_payload(&buf->vb, 0, size);
305 if (!buf->p_dma_desc) {
306 if (list_empty(&isi->dma_desc_head)) {
307 dev_err(icd->parent, "Not enough dma descriptors.\n");
310 /* Get an available descriptor */
311 desc = list_entry(isi->dma_desc_head.next,
312 struct isi_dma_desc, list);
313 /* Delete the descriptor since now it is used */
314 list_del_init(&desc->list);
316 /* Initialize the dma descriptor */
317 desc->p_fbd->fb_address =
318 vb2_dma_contig_plane_dma_addr(vb, 0);
319 desc->p_fbd->next_fbd_address = 0;
320 set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
322 buf->p_dma_desc = desc;
328 static void buffer_cleanup(struct vb2_buffer *vb)
330 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
331 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
332 struct atmel_isi *isi = ici->priv;
333 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
335 /* This descriptor is available now and we add to head list */
337 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
340 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
344 cfg1 = isi_readl(isi, ISI_CFG1);
345 /* Enable irq: cxfr for the codec path, pxfr for the preview path */
346 isi_writel(isi, ISI_INTEN,
347 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
349 /* Check if already in a frame */
350 if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
351 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n");
355 isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
356 isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
357 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
359 /* Enable linked list */
360 cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
362 /* Enable codec path and ISI */
363 ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
364 isi_writel(isi, ISI_CTRL, ctrl);
365 isi_writel(isi, ISI_CFG1, cfg1);
368 static void buffer_queue(struct vb2_buffer *vb)
370 struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
371 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
372 struct atmel_isi *isi = ici->priv;
373 struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
374 unsigned long flags = 0;
376 spin_lock_irqsave(&isi->lock, flags);
377 list_add_tail(&buf->list, &isi->video_buffer_list);
379 if (isi->active == NULL) {
381 if (vb2_is_streaming(vb->vb2_queue))
384 spin_unlock_irqrestore(&isi->lock, flags);
387 static int start_streaming(struct vb2_queue *vq, unsigned int count)
389 struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 struct atmel_isi *isi = ici->priv;
394 spin_lock_irq(&isi->lock);
395 /* Clear any pending interrupt */
396 sr = isi_readl(isi, ISI_STATUS);
399 start_dma(isi, isi->active);
400 spin_unlock_irq(&isi->lock);
405 /* abort streaming and wait for last buffer */
406 static int stop_streaming(struct vb2_queue *vq)
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;
411 struct frame_buffer *buf, *node;
413 unsigned long timeout;
415 spin_lock_irq(&isi->lock);
417 /* Release all active buffers */
418 list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
419 list_del_init(&buf->list);
420 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
422 spin_unlock_irq(&isi->lock);
424 timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
425 /* Wait until the end of the current frame. */
426 while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
427 time_before(jiffies, timeout))
430 if (time_after(jiffies, timeout)) {
432 "Timeout waiting for finishing codec request\n");
436 /* Disable interrupts */
437 isi_writel(isi, ISI_INTDIS,
438 ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
440 /* Disable ISI and wait for it is done */
441 ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
443 dev_err(icd->parent, "Disable ISI timed out\n");
448 static struct vb2_ops isi_video_qops = {
449 .queue_setup = queue_setup,
450 .buf_init = buffer_init,
451 .buf_prepare = buffer_prepare,
452 .buf_cleanup = buffer_cleanup,
453 .buf_queue = buffer_queue,
454 .start_streaming = start_streaming,
455 .stop_streaming = stop_streaming,
456 .wait_prepare = soc_camera_unlock,
457 .wait_finish = soc_camera_lock,
460 /* ------------------------------------------------------------------
461 SOC camera operations for the device
462 ------------------------------------------------------------------*/
463 static int isi_camera_init_videobuf(struct vb2_queue *q,
464 struct soc_camera_device *icd)
466 q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
467 q->io_modes = VB2_MMAP;
469 q->buf_struct_size = sizeof(struct frame_buffer);
470 q->ops = &isi_video_qops;
471 q->mem_ops = &vb2_dma_contig_memops;
472 q->timestamp_type = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
474 return vb2_queue_init(q);
477 static int isi_camera_set_fmt(struct soc_camera_device *icd,
478 struct v4l2_format *f)
480 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
481 struct atmel_isi *isi = ici->priv;
482 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
483 const struct soc_camera_format_xlate *xlate;
484 struct v4l2_pix_format *pix = &f->fmt.pix;
485 struct v4l2_mbus_framefmt mf;
488 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
490 dev_warn(icd->parent, "Format %x not found\n",
495 dev_dbg(icd->parent, "Plan to set format %dx%d\n",
496 pix->width, pix->height);
498 mf.width = pix->width;
499 mf.height = pix->height;
500 mf.field = pix->field;
501 mf.colorspace = pix->colorspace;
502 mf.code = xlate->code;
504 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
508 if (mf.code != xlate->code)
511 ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
515 pix->width = mf.width;
516 pix->height = mf.height;
517 pix->field = mf.field;
518 pix->colorspace = mf.colorspace;
519 icd->current_fmt = xlate;
521 dev_dbg(icd->parent, "Finally set format %dx%d\n",
522 pix->width, pix->height);
527 static int isi_camera_try_fmt(struct soc_camera_device *icd,
528 struct v4l2_format *f)
530 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
531 const struct soc_camera_format_xlate *xlate;
532 struct v4l2_pix_format *pix = &f->fmt.pix;
533 struct v4l2_mbus_framefmt mf;
534 u32 pixfmt = pix->pixelformat;
537 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
538 if (pixfmt && !xlate) {
539 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
543 /* limit to Atmel ISI hardware capabilities */
544 if (pix->height > MAX_SUPPORT_HEIGHT)
545 pix->height = MAX_SUPPORT_HEIGHT;
546 if (pix->width > MAX_SUPPORT_WIDTH)
547 pix->width = MAX_SUPPORT_WIDTH;
549 /* limit to sensor capabilities */
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, try_mbus_fmt, &mf);
560 pix->width = mf.width;
561 pix->height = mf.height;
562 pix->colorspace = mf.colorspace;
566 pix->field = V4L2_FIELD_NONE;
568 case V4L2_FIELD_NONE:
571 dev_err(icd->parent, "Field type %d unsupported.\n",
579 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
581 .fourcc = V4L2_PIX_FMT_YUYV,
582 .name = "Packed YUV422 16 bit",
583 .bits_per_sample = 8,
584 .packing = SOC_MBUS_PACKING_2X8_PADHI,
585 .order = SOC_MBUS_ORDER_LE,
586 .layout = SOC_MBUS_LAYOUT_PACKED,
590 /* This will be corrected as we get more formats */
591 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
593 return fmt->packing == SOC_MBUS_PACKING_NONE ||
594 (fmt->bits_per_sample == 8 &&
595 fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
596 (fmt->bits_per_sample > 8 &&
597 fmt->packing == SOC_MBUS_PACKING_EXTEND16);
600 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER | \
601 V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
602 V4L2_MBUS_HSYNC_ACTIVE_LOW | \
603 V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
604 V4L2_MBUS_VSYNC_ACTIVE_LOW | \
605 V4L2_MBUS_PCLK_SAMPLE_RISING | \
606 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
607 V4L2_MBUS_DATA_ACTIVE_HIGH)
609 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
610 unsigned char buswidth)
612 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
613 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
614 struct atmel_isi *isi = ici->priv;
615 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
616 unsigned long common_flags;
619 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
621 common_flags = soc_mbus_config_compatible(&cfg,
624 dev_warn(icd->parent,
625 "Flags incompatible: camera 0x%x, host 0x%x\n",
626 cfg.flags, ISI_BUS_PARAM);
629 } else if (ret != -ENOIOCTLCMD) {
633 if ((1 << (buswidth - 1)) & isi->width_flags)
639 static int isi_camera_get_formats(struct soc_camera_device *icd,
641 struct soc_camera_format_xlate *xlate)
643 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
644 int formats = 0, ret;
646 enum v4l2_mbus_pixelcode code;
647 /* soc camera host format */
648 const struct soc_mbus_pixelfmt *fmt;
650 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
652 /* No more formats */
655 fmt = soc_mbus_get_fmtdesc(code);
658 "Invalid format code #%u: %d\n", idx, code);
662 /* This also checks support for the requested bits-per-sample */
663 ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
666 "Fail to try the bus parameters.\n");
671 case V4L2_MBUS_FMT_UYVY8_2X8:
672 case V4L2_MBUS_FMT_VYUY8_2X8:
673 case V4L2_MBUS_FMT_YUYV8_2X8:
674 case V4L2_MBUS_FMT_YVYU8_2X8:
677 xlate->host_fmt = &isi_camera_formats[0];
680 dev_dbg(icd->parent, "Providing format %s using code %d\n",
681 isi_camera_formats[0].name, code);
685 if (!isi_camera_packing_supported(fmt))
689 "Providing format %s in pass-through mode\n",
693 /* Generic pass-through */
696 xlate->host_fmt = fmt;
704 static int isi_camera_add_device(struct soc_camera_device *icd)
706 dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
712 static void isi_camera_remove_device(struct soc_camera_device *icd)
714 dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
718 /* Called with .host_lock held */
719 static int isi_camera_clock_start(struct soc_camera_host *ici)
721 struct atmel_isi *isi = ici->priv;
724 ret = clk_enable(isi->pclk);
728 ret = clk_enable(isi->mck);
730 clk_disable(isi->pclk);
737 /* Called with .host_lock held */
738 static void isi_camera_clock_stop(struct soc_camera_host *ici)
740 struct atmel_isi *isi = ici->priv;
742 clk_disable(isi->mck);
743 clk_disable(isi->pclk);
746 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
748 struct soc_camera_device *icd = file->private_data;
750 return vb2_poll(&icd->vb2_vidq, file, pt);
753 static int isi_camera_querycap(struct soc_camera_host *ici,
754 struct v4l2_capability *cap)
756 strcpy(cap->driver, "atmel-isi");
757 strcpy(cap->card, "Atmel Image Sensor Interface");
758 cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
763 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
765 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
766 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
767 struct atmel_isi *isi = ici->priv;
768 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
769 unsigned long common_flags;
773 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
775 common_flags = soc_mbus_config_compatible(&cfg,
778 dev_warn(icd->parent,
779 "Flags incompatible: camera 0x%x, host 0x%x\n",
780 cfg.flags, ISI_BUS_PARAM);
783 } else if (ret != -ENOIOCTLCMD) {
786 common_flags = ISI_BUS_PARAM;
788 dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
789 cfg.flags, ISI_BUS_PARAM, common_flags);
791 /* Make choises, based on platform preferences */
792 if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
793 (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
794 if (isi->pdata->hsync_act_low)
795 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
797 common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
800 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
801 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
802 if (isi->pdata->vsync_act_low)
803 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
805 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
808 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
809 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
810 if (isi->pdata->pclk_act_falling)
811 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
813 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
816 cfg.flags = common_flags;
817 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
818 if (ret < 0 && ret != -ENOIOCTLCMD) {
819 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
824 /* set bus param for ISI */
825 if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
826 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
827 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
828 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
829 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
830 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
832 if (isi->pdata->has_emb_sync)
833 cfg1 |= ISI_CFG1_EMB_SYNC;
834 if (isi->pdata->full_mode)
835 cfg1 |= ISI_CFG1_FULL_MODE;
837 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
838 isi_writel(isi, ISI_CFG1, cfg1);
843 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
844 .owner = THIS_MODULE,
845 .add = isi_camera_add_device,
846 .remove = isi_camera_remove_device,
847 .clock_start = isi_camera_clock_start,
848 .clock_stop = isi_camera_clock_stop,
849 .set_fmt = isi_camera_set_fmt,
850 .try_fmt = isi_camera_try_fmt,
851 .get_formats = isi_camera_get_formats,
852 .init_videobuf2 = isi_camera_init_videobuf,
853 .poll = isi_camera_poll,
854 .querycap = isi_camera_querycap,
855 .set_bus_param = isi_camera_set_bus_param,
858 /* -----------------------------------------------------------------------*/
859 static int atmel_isi_remove(struct platform_device *pdev)
861 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
862 struct atmel_isi *isi = container_of(soc_host,
863 struct atmel_isi, soc_host);
865 soc_camera_host_unregister(soc_host);
866 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
867 dma_free_coherent(&pdev->dev,
868 sizeof(struct fbd) * MAX_BUFFER_NUM,
869 isi->p_fb_descriptors,
870 isi->fb_descriptors_phys);
872 clk_unprepare(isi->mck);
873 clk_unprepare(isi->pclk);
878 static int atmel_isi_probe(struct platform_device *pdev)
881 struct atmel_isi *isi;
882 struct resource *regs;
884 struct device *dev = &pdev->dev;
885 struct soc_camera_host *soc_host;
886 struct isi_platform_data *pdata;
888 pdata = dev->platform_data;
889 if (!pdata || !pdata->data_width_flags || !pdata->mck_hz) {
891 "No config available for Atmel ISI\n");
895 isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
897 dev_err(&pdev->dev, "Can't allocate interface!\n");
901 isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
902 if (IS_ERR(isi->pclk))
903 return PTR_ERR(isi->pclk);
905 ret = clk_prepare(isi->pclk);
911 spin_lock_init(&isi->lock);
912 INIT_LIST_HEAD(&isi->video_buffer_list);
913 INIT_LIST_HEAD(&isi->dma_desc_head);
915 /* Get ISI_MCK, provided by programmable clock or external clock */
916 isi->mck = devm_clk_get(dev, "isi_mck");
917 if (IS_ERR(isi->mck)) {
918 dev_err(dev, "Failed to get isi_mck\n");
919 ret = PTR_ERR(isi->mck);
920 goto err_clk_get_mck;
923 ret = clk_prepare(isi->mck);
925 goto err_clk_prepare_mck;
927 /* Set ISI_MCK's frequency, it should be faster than pixel clock */
928 ret = clk_set_rate(isi->mck, pdata->mck_hz);
930 goto err_set_mck_rate;
932 isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
933 sizeof(struct fbd) * MAX_BUFFER_NUM,
934 &isi->fb_descriptors_phys,
936 if (!isi->p_fb_descriptors) {
938 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
939 goto err_alloc_descriptors;
942 for (i = 0; i < MAX_BUFFER_NUM; i++) {
943 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
944 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
945 i * sizeof(struct fbd);
946 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
949 isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
950 if (IS_ERR(isi->alloc_ctx)) {
951 ret = PTR_ERR(isi->alloc_ctx);
955 regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
956 isi->regs = devm_ioremap_resource(&pdev->dev, regs);
957 if (IS_ERR(isi->regs)) {
958 ret = PTR_ERR(isi->regs);
962 if (pdata->data_width_flags & ISI_DATAWIDTH_8)
963 isi->width_flags = 1 << 7;
964 if (pdata->data_width_flags & ISI_DATAWIDTH_10)
965 isi->width_flags |= 1 << 9;
967 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
969 irq = platform_get_irq(pdev, 0);
970 if (IS_ERR_VALUE(irq)) {
975 ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
977 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
982 soc_host = &isi->soc_host;
983 soc_host->drv_name = "isi-camera";
984 soc_host->ops = &isi_soc_camera_host_ops;
985 soc_host->priv = isi;
986 soc_host->v4l2_dev.dev = &pdev->dev;
987 soc_host->nr = pdev->id;
989 ret = soc_camera_host_register(soc_host);
991 dev_err(&pdev->dev, "Unable to register soc camera host\n");
992 goto err_register_soc_camera_host;
996 err_register_soc_camera_host:
999 vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1001 dma_free_coherent(&pdev->dev,
1002 sizeof(struct fbd) * MAX_BUFFER_NUM,
1003 isi->p_fb_descriptors,
1004 isi->fb_descriptors_phys);
1005 err_alloc_descriptors:
1007 clk_unprepare(isi->mck);
1008 err_clk_prepare_mck:
1010 clk_unprepare(isi->pclk);
1015 static struct platform_driver atmel_isi_driver = {
1016 .remove = atmel_isi_remove,
1018 .name = "atmel_isi",
1019 .owner = THIS_MODULE,
1023 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1025 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1026 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1027 MODULE_LICENSE("GPL");
1028 MODULE_SUPPORTED_DEVICE("video");