Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/drivers/media/platform/soc_camera/atmel-isi.c

  1 /*
  2  * Copyright (c) 2011 Atmel Corporation
  3  * Josh Wu, <josh.wu@atmel.com>
  4  *
  5  * Based on previous work by Lars Haring, <lars.haring@atmel.com>
  6  * and Sedji Gaouaou
  7  * Based on the bttv driver for Bt848 with respective copyright holders
  8  *
  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.
 12  */
 13 
 14 #include <linux/clk.h>
 15 #include <linux/completion.h>
 16 #include <linux/delay.h>
 17 #include <linux/fs.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>
 24 
 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>
 29 
 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)
 36 
 37 /* Frame buffer descriptor */
 38 struct fbd {
 39         /* Physical address of the frame buffer */
 40         u32 fb_address;
 41         /* DMA Control Register(only in HISI2) */
 42         u32 dma_ctrl;
 43         /* Physical address of the next fbd */
 44         u32 next_fbd_address;
 45 };
 46 
 47 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
 48 {
 49         fb_desc->dma_ctrl = ctrl;
 50 }
 51 
 52 struct isi_dma_desc {
 53         struct list_head list;
 54         struct fbd *p_fbd;
 55         u32 fbd_phys;
 56 };
 57 
 58 /* Frame buffer data */
 59 struct frame_buffer {
 60         struct vb2_buffer vb;
 61         struct isi_dma_desc *p_dma_desc;
 62         struct list_head list;
 63 };
 64 
 65 struct atmel_isi {
 66         /* Protects the access of variables shared with the ISR */
 67         spinlock_t                      lock;
 68         void __iomem                    *regs;
 69 
 70         int                             sequence;
 71 
 72         struct vb2_alloc_ctx            *alloc_ctx;
 73 
 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];
 79 
 80         struct completion               complete;
 81         /* ISI peripherial clock */
 82         struct clk                      *pclk;
 83         /* ISI_MCK, feed to camera sensor to generate pixel clock */
 84         struct clk                      *mck;
 85         unsigned int                    irq;
 86 
 87         struct isi_platform_data        *pdata;
 88         u16                             width_flags;    /* max 12 bits */
 89 
 90         struct list_head                video_buffer_list;
 91         struct frame_buffer             *active;
 92 
 93         struct soc_camera_host          soc_host;
 94 };
 95 
 96 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
 97 {
 98         writel(val, isi->regs + reg);
 99 }
100 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
101 {
102         return readl(isi->regs + reg);
103 }
104 
105 static int configure_geometry(struct atmel_isi *isi, u32 width,
106                         u32 height, enum v4l2_mbus_pixelcode code)
107 {
108         u32 cfg2, cr;
109 
110         switch (code) {
111         /* YUV, including grey */
112         case V4L2_MBUS_FMT_Y8_1X8:
113                 cr = ISI_CFG2_GRAYSCALE;
114                 break;
115         case V4L2_MBUS_FMT_VYUY8_2X8:
116                 cr = ISI_CFG2_YCC_SWAP_MODE_3;
117                 break;
118         case V4L2_MBUS_FMT_UYVY8_2X8:
119                 cr = ISI_CFG2_YCC_SWAP_MODE_2;
120                 break;
121         case V4L2_MBUS_FMT_YVYU8_2X8:
122                 cr = ISI_CFG2_YCC_SWAP_MODE_1;
123                 break;
124         case V4L2_MBUS_FMT_YUYV8_2X8:
125                 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
126                 break;
127         /* RGB, TODO */
128         default:
129                 return -EINVAL;
130         }
131 
132         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
133 
134         cfg2 = isi_readl(isi, ISI_CFG2);
135         /* Set YCC swap mode */
136         cfg2 &= ~ISI_CFG2_YCC_SWAP_MODE_MASK;
137         cfg2 |= cr;
138         /* Set width */
139         cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
140         cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
141                         ISI_CFG2_IM_HSIZE_MASK;
142         /* Set height */
143         cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
144         cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
145                         & ISI_CFG2_IM_VSIZE_MASK;
146         isi_writel(isi, ISI_CFG2, cfg2);
147 
148         return 0;
149 }
150 
151 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
152 {
153         if (isi->active) {
154                 struct vb2_buffer *vb = &isi->active->vb;
155                 struct frame_buffer *buf = isi->active;
156 
157                 list_del_init(&buf->list);
158                 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
159                 vb->v4l2_buf.sequence = isi->sequence++;
160                 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
161         }
162 
163         if (list_empty(&isi->video_buffer_list)) {
164                 isi->active = NULL;
165         } else {
166                 /* start next dma frame. */
167                 isi->active = list_entry(isi->video_buffer_list.next,
168                                         struct frame_buffer, list);
169                 isi_writel(isi, ISI_DMA_C_DSCR,
170                         isi->active->p_dma_desc->fbd_phys);
171                 isi_writel(isi, ISI_DMA_C_CTRL,
172                         ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
173                 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
174         }
175         return IRQ_HANDLED;
176 }
177 
178 /* ISI interrupt service routine */
179 static irqreturn_t isi_interrupt(int irq, void *dev_id)
180 {
181         struct atmel_isi *isi = dev_id;
182         u32 status, mask, pending;
183         irqreturn_t ret = IRQ_NONE;
184 
185         spin_lock(&isi->lock);
186 
187         status = isi_readl(isi, ISI_STATUS);
188         mask = isi_readl(isi, ISI_INTMASK);
189         pending = status & mask;
190 
191         if (pending & ISI_CTRL_SRST) {
192                 complete(&isi->complete);
193                 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
194                 ret = IRQ_HANDLED;
195         } else if (pending & ISI_CTRL_DIS) {
196                 complete(&isi->complete);
197                 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
198                 ret = IRQ_HANDLED;
199         } else {
200                 if (likely(pending & ISI_SR_CXFR_DONE))
201                         ret = atmel_isi_handle_streaming(isi);
202         }
203 
204         spin_unlock(&isi->lock);
205         return ret;
206 }
207 
208 #define WAIT_ISI_RESET          1
209 #define WAIT_ISI_DISABLE        0
210 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
211 {
212         unsigned long timeout;
213         /*
214          * The reset or disable will only succeed if we have a
215          * pixel clock from the camera.
216          */
217         init_completion(&isi->complete);
218 
219         if (wait_reset) {
220                 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
221                 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
222         } else {
223                 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
224                 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
225         }
226 
227         timeout = wait_for_completion_timeout(&isi->complete,
228                         msecs_to_jiffies(100));
229         if (timeout == 0)
230                 return -ETIMEDOUT;
231 
232         return 0;
233 }
234 
235 /* ------------------------------------------------------------------
236         Videobuf operations
237    ------------------------------------------------------------------*/
238 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
239                                 unsigned int *nbuffers, unsigned int *nplanes,
240                                 unsigned int sizes[], void *alloc_ctxs[])
241 {
242         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
243         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
244         struct atmel_isi *isi = ici->priv;
245         unsigned long size;
246 
247         size = icd->sizeimage;
248 
249         if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
250                 *nbuffers = MAX_BUFFER_NUM;
251 
252         if (size * *nbuffers > VID_LIMIT_BYTES)
253                 *nbuffers = VID_LIMIT_BYTES / size;
254 
255         *nplanes = 1;
256         sizes[0] = size;
257         alloc_ctxs[0] = isi->alloc_ctx;
258 
259         isi->sequence = 0;
260         isi->active = NULL;
261 
262         dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
263                 *nbuffers, size);
264 
265         return 0;
266 }
267 
268 static int buffer_init(struct vb2_buffer *vb)
269 {
270         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
271 
272         buf->p_dma_desc = NULL;
273         INIT_LIST_HEAD(&buf->list);
274 
275         return 0;
276 }
277 
278 static int buffer_prepare(struct vb2_buffer *vb)
279 {
280         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
281         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
282         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
283         struct atmel_isi *isi = ici->priv;
284         unsigned long size;
285         struct isi_dma_desc *desc;
286 
287         size = icd->sizeimage;
288 
289         if (vb2_plane_size(vb, 0) < size) {
290                 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
291                                 __func__, vb2_plane_size(vb, 0), size);
292                 return -EINVAL;
293         }
294 
295         vb2_set_plane_payload(&buf->vb, 0, size);
296 
297         if (!buf->p_dma_desc) {
298                 if (list_empty(&isi->dma_desc_head)) {
299                         dev_err(icd->parent, "Not enough dma descriptors.\n");
300                         return -EINVAL;
301                 } else {
302                         /* Get an available descriptor */
303                         desc = list_entry(isi->dma_desc_head.next,
304                                                 struct isi_dma_desc, list);
305                         /* Delete the descriptor since now it is used */
306                         list_del_init(&desc->list);
307 
308                         /* Initialize the dma descriptor */
309                         desc->p_fbd->fb_address =
310                                         vb2_dma_contig_plane_dma_addr(vb, 0);
311                         desc->p_fbd->next_fbd_address = 0;
312                         set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
313 
314                         buf->p_dma_desc = desc;
315                 }
316         }
317         return 0;
318 }
319 
320 static void buffer_cleanup(struct vb2_buffer *vb)
321 {
322         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
323         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
324         struct atmel_isi *isi = ici->priv;
325         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
326 
327         /* This descriptor is available now and we add to head list */
328         if (buf->p_dma_desc)
329                 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
330 }
331 
332 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
333 {
334         u32 ctrl, cfg1;
335 
336         cfg1 = isi_readl(isi, ISI_CFG1);
337         /* Enable irq: cxfr for the codec path, pxfr for the preview path */
338         isi_writel(isi, ISI_INTEN,
339                         ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
340 
341         /* Check if already in a frame */
342         if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
343                 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n");
344                 return;
345         }
346 
347         isi_writel(isi, ISI_DMA_C_DSCR, buffer->p_dma_desc->fbd_phys);
348         isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
349         isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
350 
351         cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
352         /* Enable linked list */
353         cfg1 |= isi->pdata->frate | ISI_CFG1_DISCR;
354 
355         /* Enable codec path and ISI */
356         ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
357         isi_writel(isi, ISI_CTRL, ctrl);
358         isi_writel(isi, ISI_CFG1, cfg1);
359 }
360 
361 static void buffer_queue(struct vb2_buffer *vb)
362 {
363         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
364         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
365         struct atmel_isi *isi = ici->priv;
366         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
367         unsigned long flags = 0;
368 
369         spin_lock_irqsave(&isi->lock, flags);
370         list_add_tail(&buf->list, &isi->video_buffer_list);
371 
372         if (isi->active == NULL) {
373                 isi->active = buf;
374                 if (vb2_is_streaming(vb->vb2_queue))
375                         start_dma(isi, buf);
376         }
377         spin_unlock_irqrestore(&isi->lock, flags);
378 }
379 
380 static int start_streaming(struct vb2_queue *vq, unsigned int count)
381 {
382         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
383         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
384         struct atmel_isi *isi = ici->priv;
385         u32 sr = 0;
386         int ret;
387 
388         /* Reset ISI */
389         ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
390         if (ret < 0) {
391                 dev_err(icd->parent, "Reset ISI timed out\n");
392                 return ret;
393         }
394         /* Disable all interrupts */
395         isi_writel(isi, ISI_INTDIS, ~0UL);
396 
397         spin_lock_irq(&isi->lock);
398         /* Clear any pending interrupt */
399         sr = isi_readl(isi, ISI_STATUS);
400 
401         if (count)
402                 start_dma(isi, isi->active);
403         spin_unlock_irq(&isi->lock);
404 
405         return 0;
406 }
407 
408 /* abort streaming and wait for last buffer */
409 static int stop_streaming(struct vb2_queue *vq)
410 {
411         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
412         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
413         struct atmel_isi *isi = ici->priv;
414         struct frame_buffer *buf, *node;
415         int ret = 0;
416         unsigned long timeout;
417 
418         spin_lock_irq(&isi->lock);
419         isi->active = NULL;
420         /* Release all active buffers */
421         list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
422                 list_del_init(&buf->list);
423                 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
424         }
425         spin_unlock_irq(&isi->lock);
426 
427         timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
428         /* Wait until the end of the current frame. */
429         while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
430                         time_before(jiffies, timeout))
431                 msleep(1);
432 
433         if (time_after(jiffies, timeout)) {
434                 dev_err(icd->parent,
435                         "Timeout waiting for finishing codec request\n");
436                 return -ETIMEDOUT;
437         }
438 
439         /* Disable interrupts */
440         isi_writel(isi, ISI_INTDIS,
441                         ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
442 
443         /* Disable ISI and wait for it is done */
444         ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
445         if (ret < 0)
446                 dev_err(icd->parent, "Disable ISI timed out\n");
447 
448         return ret;
449 }
450 
451 static struct vb2_ops isi_video_qops = {
452         .queue_setup            = queue_setup,
453         .buf_init               = buffer_init,
454         .buf_prepare            = buffer_prepare,
455         .buf_cleanup            = buffer_cleanup,
456         .buf_queue              = buffer_queue,
457         .start_streaming        = start_streaming,
458         .stop_streaming         = stop_streaming,
459         .wait_prepare           = soc_camera_unlock,
460         .wait_finish            = soc_camera_lock,
461 };
462 
463 /* ------------------------------------------------------------------
464         SOC camera operations for the device
465    ------------------------------------------------------------------*/
466 static int isi_camera_init_videobuf(struct vb2_queue *q,
467                                      struct soc_camera_device *icd)
468 {
469         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
470         q->io_modes = VB2_MMAP;
471         q->drv_priv = icd;
472         q->buf_struct_size = sizeof(struct frame_buffer);
473         q->ops = &isi_video_qops;
474         q->mem_ops = &vb2_dma_contig_memops;
475         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
476 
477         return vb2_queue_init(q);
478 }
479 
480 static int isi_camera_set_fmt(struct soc_camera_device *icd,
481                               struct v4l2_format *f)
482 {
483         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
484         struct atmel_isi *isi = ici->priv;
485         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
486         const struct soc_camera_format_xlate *xlate;
487         struct v4l2_pix_format *pix = &f->fmt.pix;
488         struct v4l2_mbus_framefmt mf;
489         int ret;
490 
491         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
492         if (!xlate) {
493                 dev_warn(icd->parent, "Format %x not found\n",
494                          pix->pixelformat);
495                 return -EINVAL;
496         }
497 
498         dev_dbg(icd->parent, "Plan to set format %dx%d\n",
499                         pix->width, pix->height);
500 
501         mf.width        = pix->width;
502         mf.height       = pix->height;
503         mf.field        = pix->field;
504         mf.colorspace   = pix->colorspace;
505         mf.code         = xlate->code;
506 
507         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
508         if (ret < 0)
509                 return ret;
510 
511         if (mf.code != xlate->code)
512                 return -EINVAL;
513 
514         ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
515         if (ret < 0)
516                 return ret;
517 
518         pix->width              = mf.width;
519         pix->height             = mf.height;
520         pix->field              = mf.field;
521         pix->colorspace         = mf.colorspace;
522         icd->current_fmt        = xlate;
523 
524         dev_dbg(icd->parent, "Finally set format %dx%d\n",
525                 pix->width, pix->height);
526 
527         return ret;
528 }
529 
530 static int isi_camera_try_fmt(struct soc_camera_device *icd,
531                               struct v4l2_format *f)
532 {
533         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
534         const struct soc_camera_format_xlate *xlate;
535         struct v4l2_pix_format *pix = &f->fmt.pix;
536         struct v4l2_mbus_framefmt mf;
537         u32 pixfmt = pix->pixelformat;
538         int ret;
539 
540         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
541         if (pixfmt && !xlate) {
542                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
543                 return -EINVAL;
544         }
545 
546         /* limit to Atmel ISI hardware capabilities */
547         if (pix->height > MAX_SUPPORT_HEIGHT)
548                 pix->height = MAX_SUPPORT_HEIGHT;
549         if (pix->width > MAX_SUPPORT_WIDTH)
550                 pix->width = MAX_SUPPORT_WIDTH;
551 
552         /* limit to sensor capabilities */
553         mf.width        = pix->width;
554         mf.height       = pix->height;
555         mf.field        = pix->field;
556         mf.colorspace   = pix->colorspace;
557         mf.code         = xlate->code;
558 
559         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
560         if (ret < 0)
561                 return ret;
562 
563         pix->width      = mf.width;
564         pix->height     = mf.height;
565         pix->colorspace = mf.colorspace;
566 
567         switch (mf.field) {
568         case V4L2_FIELD_ANY:
569                 pix->field = V4L2_FIELD_NONE;
570                 break;
571         case V4L2_FIELD_NONE:
572                 break;
573         default:
574                 dev_err(icd->parent, "Field type %d unsupported.\n",
575                         mf.field);
576                 ret = -EINVAL;
577         }
578 
579         return ret;
580 }
581 
582 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
583         {
584                 .fourcc                 = V4L2_PIX_FMT_YUYV,
585                 .name                   = "Packed YUV422 16 bit",
586                 .bits_per_sample        = 8,
587                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
588                 .order                  = SOC_MBUS_ORDER_LE,
589                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
590         },
591 };
592 
593 /* This will be corrected as we get more formats */
594 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
595 {
596         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
597                 (fmt->bits_per_sample == 8 &&
598                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
599                 (fmt->bits_per_sample > 8 &&
600                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
601 }
602 
603 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER |       \
604                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
605                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
606                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
607                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
608                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
609                 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
610                 V4L2_MBUS_DATA_ACTIVE_HIGH)
611 
612 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
613                                     unsigned char buswidth)
614 {
615         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
616         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
617         struct atmel_isi *isi = ici->priv;
618         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
619         unsigned long common_flags;
620         int ret;
621 
622         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
623         if (!ret) {
624                 common_flags = soc_mbus_config_compatible(&cfg,
625                                                           ISI_BUS_PARAM);
626                 if (!common_flags) {
627                         dev_warn(icd->parent,
628                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
629                                  cfg.flags, ISI_BUS_PARAM);
630                         return -EINVAL;
631                 }
632         } else if (ret != -ENOIOCTLCMD) {
633                 return ret;
634         }
635 
636         if ((1 << (buswidth - 1)) & isi->width_flags)
637                 return 0;
638         return -EINVAL;
639 }
640 
641 
642 static int isi_camera_get_formats(struct soc_camera_device *icd,
643                                   unsigned int idx,
644                                   struct soc_camera_format_xlate *xlate)
645 {
646         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
647         int formats = 0, ret;
648         /* sensor format */
649         enum v4l2_mbus_pixelcode code;
650         /* soc camera host format */
651         const struct soc_mbus_pixelfmt *fmt;
652 
653         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
654         if (ret < 0)
655                 /* No more formats */
656                 return 0;
657 
658         fmt = soc_mbus_get_fmtdesc(code);
659         if (!fmt) {
660                 dev_err(icd->parent,
661                         "Invalid format code #%u: %d\n", idx, code);
662                 return 0;
663         }
664 
665         /* This also checks support for the requested bits-per-sample */
666         ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
667         if (ret < 0) {
668                 dev_err(icd->parent,
669                         "Fail to try the bus parameters.\n");
670                 return 0;
671         }
672 
673         switch (code) {
674         case V4L2_MBUS_FMT_UYVY8_2X8:
675         case V4L2_MBUS_FMT_VYUY8_2X8:
676         case V4L2_MBUS_FMT_YUYV8_2X8:
677         case V4L2_MBUS_FMT_YVYU8_2X8:
678                 formats++;
679                 if (xlate) {
680                         xlate->host_fmt = &isi_camera_formats[0];
681                         xlate->code     = code;
682                         xlate++;
683                         dev_dbg(icd->parent, "Providing format %s using code %d\n",
684                                 isi_camera_formats[0].name, code);
685                 }
686                 break;
687         default:
688                 if (!isi_camera_packing_supported(fmt))
689                         return 0;
690                 if (xlate)
691                         dev_dbg(icd->parent,
692                                 "Providing format %s in pass-through mode\n",
693                                 fmt->name);
694         }
695 
696         /* Generic pass-through */
697         formats++;
698         if (xlate) {
699                 xlate->host_fmt = fmt;
700                 xlate->code     = code;
701                 xlate++;
702         }
703 
704         return formats;
705 }
706 
707 static int isi_camera_add_device(struct soc_camera_device *icd)
708 {
709         dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
710                  icd->devnum);
711 
712         return 0;
713 }
714 
715 static void isi_camera_remove_device(struct soc_camera_device *icd)
716 {
717         dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
718                  icd->devnum);
719 }
720 
721 /* Called with .host_lock held */
722 static int isi_camera_clock_start(struct soc_camera_host *ici)
723 {
724         struct atmel_isi *isi = ici->priv;
725         int ret;
726 
727         ret = clk_prepare_enable(isi->pclk);
728         if (ret)
729                 return ret;
730 
731         if (!IS_ERR(isi->mck)) {
732                 ret = clk_prepare_enable(isi->mck);
733                 if (ret) {
734                         clk_disable_unprepare(isi->pclk);
735                         return ret;
736                 }
737         }
738 
739         return 0;
740 }
741 
742 /* Called with .host_lock held */
743 static void isi_camera_clock_stop(struct soc_camera_host *ici)
744 {
745         struct atmel_isi *isi = ici->priv;
746 
747         if (!IS_ERR(isi->mck))
748                 clk_disable_unprepare(isi->mck);
749         clk_disable_unprepare(isi->pclk);
750 }
751 
752 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
753 {
754         struct soc_camera_device *icd = file->private_data;
755 
756         return vb2_poll(&icd->vb2_vidq, file, pt);
757 }
758 
759 static int isi_camera_querycap(struct soc_camera_host *ici,
760                                struct v4l2_capability *cap)
761 {
762         strcpy(cap->driver, "atmel-isi");
763         strcpy(cap->card, "Atmel Image Sensor Interface");
764         cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
765                                 V4L2_CAP_STREAMING);
766         return 0;
767 }
768 
769 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
770 {
771         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
772         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
773         struct atmel_isi *isi = ici->priv;
774         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
775         unsigned long common_flags;
776         int ret;
777         u32 cfg1 = 0;
778 
779         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
780         if (!ret) {
781                 common_flags = soc_mbus_config_compatible(&cfg,
782                                                           ISI_BUS_PARAM);
783                 if (!common_flags) {
784                         dev_warn(icd->parent,
785                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
786                                  cfg.flags, ISI_BUS_PARAM);
787                         return -EINVAL;
788                 }
789         } else if (ret != -ENOIOCTLCMD) {
790                 return ret;
791         } else {
792                 common_flags = ISI_BUS_PARAM;
793         }
794         dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
795                 cfg.flags, ISI_BUS_PARAM, common_flags);
796 
797         /* Make choises, based on platform preferences */
798         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
799             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
800                 if (isi->pdata->hsync_act_low)
801                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
802                 else
803                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
804         }
805 
806         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
807             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
808                 if (isi->pdata->vsync_act_low)
809                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
810                 else
811                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
812         }
813 
814         if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
815             (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
816                 if (isi->pdata->pclk_act_falling)
817                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
818                 else
819                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
820         }
821 
822         cfg.flags = common_flags;
823         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
824         if (ret < 0 && ret != -ENOIOCTLCMD) {
825                 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
826                         common_flags, ret);
827                 return ret;
828         }
829 
830         /* set bus param for ISI */
831         if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
832                 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
833         if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
834                 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
835         if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
836                 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
837 
838         if (isi->pdata->has_emb_sync)
839                 cfg1 |= ISI_CFG1_EMB_SYNC;
840         if (isi->pdata->full_mode)
841                 cfg1 |= ISI_CFG1_FULL_MODE;
842 
843         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
844         isi_writel(isi, ISI_CFG1, cfg1);
845 
846         return 0;
847 }
848 
849 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
850         .owner          = THIS_MODULE,
851         .add            = isi_camera_add_device,
852         .remove         = isi_camera_remove_device,
853         .clock_start    = isi_camera_clock_start,
854         .clock_stop     = isi_camera_clock_stop,
855         .set_fmt        = isi_camera_set_fmt,
856         .try_fmt        = isi_camera_try_fmt,
857         .get_formats    = isi_camera_get_formats,
858         .init_videobuf2 = isi_camera_init_videobuf,
859         .poll           = isi_camera_poll,
860         .querycap       = isi_camera_querycap,
861         .set_bus_param  = isi_camera_set_bus_param,
862 };
863 
864 /* -----------------------------------------------------------------------*/
865 static int atmel_isi_remove(struct platform_device *pdev)
866 {
867         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
868         struct atmel_isi *isi = container_of(soc_host,
869                                         struct atmel_isi, soc_host);
870 
871         soc_camera_host_unregister(soc_host);
872         vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
873         dma_free_coherent(&pdev->dev,
874                         sizeof(struct fbd) * MAX_BUFFER_NUM,
875                         isi->p_fb_descriptors,
876                         isi->fb_descriptors_phys);
877 
878         return 0;
879 }
880 
881 static int atmel_isi_probe(struct platform_device *pdev)
882 {
883         unsigned int irq;
884         struct atmel_isi *isi;
885         struct resource *regs;
886         int ret, i;
887         struct device *dev = &pdev->dev;
888         struct soc_camera_host *soc_host;
889         struct isi_platform_data *pdata;
890 
891         pdata = dev->platform_data;
892         if (!pdata || !pdata->data_width_flags) {
893                 dev_err(&pdev->dev,
894                         "No config available for Atmel ISI\n");
895                 return -EINVAL;
896         }
897 
898         isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
899         if (!isi) {
900                 dev_err(&pdev->dev, "Can't allocate interface!\n");
901                 return -ENOMEM;
902         }
903 
904         isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
905         if (IS_ERR(isi->pclk))
906                 return PTR_ERR(isi->pclk);
907 
908         isi->pdata = pdata;
909         isi->active = NULL;
910         spin_lock_init(&isi->lock);
911         INIT_LIST_HEAD(&isi->video_buffer_list);
912         INIT_LIST_HEAD(&isi->dma_desc_head);
913 
914         /* ISI_MCK is the sensor master clock. It should be handled by the
915          * sensor driver directly, as the ISI has no use for that clock. Make
916          * the clock optional here while platforms transition to the correct
917          * model.
918          */
919         isi->mck = devm_clk_get(dev, "isi_mck");
920         if (!IS_ERR(isi->mck)) {
921                 /* Set ISI_MCK's frequency, it should be faster than pixel
922                  * clock.
923                  */
924                 ret = clk_set_rate(isi->mck, pdata->mck_hz);
925                 if (ret < 0)
926                         return ret;
927         }
928 
929         isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
930                                 sizeof(struct fbd) * MAX_BUFFER_NUM,
931                                 &isi->fb_descriptors_phys,
932                                 GFP_KERNEL);
933         if (!isi->p_fb_descriptors) {
934                 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
935                 return -ENOMEM;
936         }
937 
938         for (i = 0; i < MAX_BUFFER_NUM; i++) {
939                 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
940                 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
941                                         i * sizeof(struct fbd);
942                 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
943         }
944 
945         isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
946         if (IS_ERR(isi->alloc_ctx)) {
947                 ret = PTR_ERR(isi->alloc_ctx);
948                 goto err_alloc_ctx;
949         }
950 
951         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
952         isi->regs = devm_ioremap_resource(&pdev->dev, regs);
953         if (IS_ERR(isi->regs)) {
954                 ret = PTR_ERR(isi->regs);
955                 goto err_ioremap;
956         }
957 
958         if (pdata->data_width_flags & ISI_DATAWIDTH_8)
959                 isi->width_flags = 1 << 7;
960         if (pdata->data_width_flags & ISI_DATAWIDTH_10)
961                 isi->width_flags |= 1 << 9;
962 
963         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
964 
965         irq = platform_get_irq(pdev, 0);
966         if (IS_ERR_VALUE(irq)) {
967                 ret = irq;
968                 goto err_req_irq;
969         }
970 
971         ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
972         if (ret) {
973                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
974                 goto err_req_irq;
975         }
976         isi->irq = irq;
977 
978         soc_host                = &isi->soc_host;
979         soc_host->drv_name      = "isi-camera";
980         soc_host->ops           = &isi_soc_camera_host_ops;
981         soc_host->priv          = isi;
982         soc_host->v4l2_dev.dev  = &pdev->dev;
983         soc_host->nr            = pdev->id;
984 
985         ret = soc_camera_host_register(soc_host);
986         if (ret) {
987                 dev_err(&pdev->dev, "Unable to register soc camera host\n");
988                 goto err_register_soc_camera_host;
989         }
990         return 0;
991 
992 err_register_soc_camera_host:
993 err_req_irq:
994 err_ioremap:
995         vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
996 err_alloc_ctx:
997         dma_free_coherent(&pdev->dev,
998                         sizeof(struct fbd) * MAX_BUFFER_NUM,
999                         isi->p_fb_descriptors,
1000                         isi->fb_descriptors_phys);
1001 
1002         return ret;
1003 }
1004 
1005 static struct platform_driver atmel_isi_driver = {
1006         .remove         = atmel_isi_remove,
1007         .driver         = {
1008                 .name = "atmel_isi",
1009                 .owner = THIS_MODULE,
1010         },
1011 };
1012 
1013 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1014 
1015 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1016 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1017 MODULE_LICENSE("GPL");
1018 MODULE_SUPPORTED_DEVICE("video");
1019 

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