Version:  2.0.40 2.2.26 2.4.37 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 3.16 3.17 3.18

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/v4l2-of.h>
 29 #include <media/videobuf2-dma-contig.h>
 30 
 31 #define MAX_BUFFER_NUM                  32
 32 #define MAX_SUPPORT_WIDTH               2048
 33 #define MAX_SUPPORT_HEIGHT              2048
 34 #define VID_LIMIT_BYTES                 (16 * 1024 * 1024)
 35 #define MIN_FRAME_RATE                  15
 36 #define FRAME_INTERVAL_MILLI_SEC        (1000 / MIN_FRAME_RATE)
 37 #define ISI_DEFAULT_MCLK_FREQ           25000000
 38 
 39 /* Frame buffer descriptor */
 40 struct fbd {
 41         /* Physical address of the frame buffer */
 42         u32 fb_address;
 43         /* DMA Control Register(only in HISI2) */
 44         u32 dma_ctrl;
 45         /* Physical address of the next fbd */
 46         u32 next_fbd_address;
 47 };
 48 
 49 static void set_dma_ctrl(struct fbd *fb_desc, u32 ctrl)
 50 {
 51         fb_desc->dma_ctrl = ctrl;
 52 }
 53 
 54 struct isi_dma_desc {
 55         struct list_head list;
 56         struct fbd *p_fbd;
 57         dma_addr_t fbd_phys;
 58 };
 59 
 60 /* Frame buffer data */
 61 struct frame_buffer {
 62         struct vb2_buffer vb;
 63         struct isi_dma_desc *p_dma_desc;
 64         struct list_head list;
 65 };
 66 
 67 struct atmel_isi {
 68         /* Protects the access of variables shared with the ISR */
 69         spinlock_t                      lock;
 70         void __iomem                    *regs;
 71 
 72         int                             sequence;
 73 
 74         struct vb2_alloc_ctx            *alloc_ctx;
 75 
 76         /* Allocate descriptors for dma buffer use */
 77         struct fbd                      *p_fb_descriptors;
 78         dma_addr_t                      fb_descriptors_phys;
 79         struct                          list_head dma_desc_head;
 80         struct isi_dma_desc             dma_desc[MAX_BUFFER_NUM];
 81 
 82         struct completion               complete;
 83         /* ISI peripherial clock */
 84         struct clk                      *pclk;
 85         /* ISI_MCK, feed to camera sensor to generate pixel clock */
 86         struct clk                      *mck;
 87         unsigned int                    irq;
 88 
 89         struct isi_platform_data        pdata;
 90         u16                             width_flags;    /* max 12 bits */
 91 
 92         struct list_head                video_buffer_list;
 93         struct frame_buffer             *active;
 94 
 95         struct soc_camera_host          soc_host;
 96 };
 97 
 98 static void isi_writel(struct atmel_isi *isi, u32 reg, u32 val)
 99 {
100         writel(val, isi->regs + reg);
101 }
102 static u32 isi_readl(struct atmel_isi *isi, u32 reg)
103 {
104         return readl(isi->regs + reg);
105 }
106 
107 static int configure_geometry(struct atmel_isi *isi, u32 width,
108                         u32 height, enum v4l2_mbus_pixelcode code)
109 {
110         u32 cfg2, cr;
111 
112         switch (code) {
113         /* YUV, including grey */
114         case V4L2_MBUS_FMT_Y8_1X8:
115                 cr = ISI_CFG2_GRAYSCALE;
116                 break;
117         case V4L2_MBUS_FMT_VYUY8_2X8:
118                 cr = ISI_CFG2_YCC_SWAP_MODE_3;
119                 break;
120         case V4L2_MBUS_FMT_UYVY8_2X8:
121                 cr = ISI_CFG2_YCC_SWAP_MODE_2;
122                 break;
123         case V4L2_MBUS_FMT_YVYU8_2X8:
124                 cr = ISI_CFG2_YCC_SWAP_MODE_1;
125                 break;
126         case V4L2_MBUS_FMT_YUYV8_2X8:
127                 cr = ISI_CFG2_YCC_SWAP_DEFAULT;
128                 break;
129         /* RGB, TODO */
130         default:
131                 return -EINVAL;
132         }
133 
134         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
135 
136         cfg2 = isi_readl(isi, ISI_CFG2);
137         /* Set YCC swap mode */
138         cfg2 &= ~ISI_CFG2_YCC_SWAP_MODE_MASK;
139         cfg2 |= cr;
140         /* Set width */
141         cfg2 &= ~(ISI_CFG2_IM_HSIZE_MASK);
142         cfg2 |= ((width - 1) << ISI_CFG2_IM_HSIZE_OFFSET) &
143                         ISI_CFG2_IM_HSIZE_MASK;
144         /* Set height */
145         cfg2 &= ~(ISI_CFG2_IM_VSIZE_MASK);
146         cfg2 |= ((height - 1) << ISI_CFG2_IM_VSIZE_OFFSET)
147                         & ISI_CFG2_IM_VSIZE_MASK;
148         isi_writel(isi, ISI_CFG2, cfg2);
149 
150         return 0;
151 }
152 
153 static irqreturn_t atmel_isi_handle_streaming(struct atmel_isi *isi)
154 {
155         if (isi->active) {
156                 struct vb2_buffer *vb = &isi->active->vb;
157                 struct frame_buffer *buf = isi->active;
158 
159                 list_del_init(&buf->list);
160                 v4l2_get_timestamp(&vb->v4l2_buf.timestamp);
161                 vb->v4l2_buf.sequence = isi->sequence++;
162                 vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
163         }
164 
165         if (list_empty(&isi->video_buffer_list)) {
166                 isi->active = NULL;
167         } else {
168                 /* start next dma frame. */
169                 isi->active = list_entry(isi->video_buffer_list.next,
170                                         struct frame_buffer, list);
171                 isi_writel(isi, ISI_DMA_C_DSCR,
172                         (u32)isi->active->p_dma_desc->fbd_phys);
173                 isi_writel(isi, ISI_DMA_C_CTRL,
174                         ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
175                 isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
176         }
177         return IRQ_HANDLED;
178 }
179 
180 /* ISI interrupt service routine */
181 static irqreturn_t isi_interrupt(int irq, void *dev_id)
182 {
183         struct atmel_isi *isi = dev_id;
184         u32 status, mask, pending;
185         irqreturn_t ret = IRQ_NONE;
186 
187         spin_lock(&isi->lock);
188 
189         status = isi_readl(isi, ISI_STATUS);
190         mask = isi_readl(isi, ISI_INTMASK);
191         pending = status & mask;
192 
193         if (pending & ISI_CTRL_SRST) {
194                 complete(&isi->complete);
195                 isi_writel(isi, ISI_INTDIS, ISI_CTRL_SRST);
196                 ret = IRQ_HANDLED;
197         } else if (pending & ISI_CTRL_DIS) {
198                 complete(&isi->complete);
199                 isi_writel(isi, ISI_INTDIS, ISI_CTRL_DIS);
200                 ret = IRQ_HANDLED;
201         } else {
202                 if (likely(pending & ISI_SR_CXFR_DONE))
203                         ret = atmel_isi_handle_streaming(isi);
204         }
205 
206         spin_unlock(&isi->lock);
207         return ret;
208 }
209 
210 #define WAIT_ISI_RESET          1
211 #define WAIT_ISI_DISABLE        0
212 static int atmel_isi_wait_status(struct atmel_isi *isi, int wait_reset)
213 {
214         unsigned long timeout;
215         /*
216          * The reset or disable will only succeed if we have a
217          * pixel clock from the camera.
218          */
219         init_completion(&isi->complete);
220 
221         if (wait_reset) {
222                 isi_writel(isi, ISI_INTEN, ISI_CTRL_SRST);
223                 isi_writel(isi, ISI_CTRL, ISI_CTRL_SRST);
224         } else {
225                 isi_writel(isi, ISI_INTEN, ISI_CTRL_DIS);
226                 isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
227         }
228 
229         timeout = wait_for_completion_timeout(&isi->complete,
230                         msecs_to_jiffies(100));
231         if (timeout == 0)
232                 return -ETIMEDOUT;
233 
234         return 0;
235 }
236 
237 /* ------------------------------------------------------------------
238         Videobuf operations
239    ------------------------------------------------------------------*/
240 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
241                                 unsigned int *nbuffers, unsigned int *nplanes,
242                                 unsigned int sizes[], void *alloc_ctxs[])
243 {
244         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
245         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
246         struct atmel_isi *isi = ici->priv;
247         unsigned long size;
248 
249         size = icd->sizeimage;
250 
251         if (!*nbuffers || *nbuffers > MAX_BUFFER_NUM)
252                 *nbuffers = MAX_BUFFER_NUM;
253 
254         if (size * *nbuffers > VID_LIMIT_BYTES)
255                 *nbuffers = VID_LIMIT_BYTES / size;
256 
257         *nplanes = 1;
258         sizes[0] = size;
259         alloc_ctxs[0] = isi->alloc_ctx;
260 
261         isi->sequence = 0;
262         isi->active = NULL;
263 
264         dev_dbg(icd->parent, "%s, count=%d, size=%ld\n", __func__,
265                 *nbuffers, size);
266 
267         return 0;
268 }
269 
270 static int buffer_init(struct vb2_buffer *vb)
271 {
272         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
273 
274         buf->p_dma_desc = NULL;
275         INIT_LIST_HEAD(&buf->list);
276 
277         return 0;
278 }
279 
280 static int buffer_prepare(struct vb2_buffer *vb)
281 {
282         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
283         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
284         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
285         struct atmel_isi *isi = ici->priv;
286         unsigned long size;
287         struct isi_dma_desc *desc;
288 
289         size = icd->sizeimage;
290 
291         if (vb2_plane_size(vb, 0) < size) {
292                 dev_err(icd->parent, "%s data will not fit into plane (%lu < %lu)\n",
293                                 __func__, vb2_plane_size(vb, 0), size);
294                 return -EINVAL;
295         }
296 
297         vb2_set_plane_payload(&buf->vb, 0, size);
298 
299         if (!buf->p_dma_desc) {
300                 if (list_empty(&isi->dma_desc_head)) {
301                         dev_err(icd->parent, "Not enough dma descriptors.\n");
302                         return -EINVAL;
303                 } else {
304                         /* Get an available descriptor */
305                         desc = list_entry(isi->dma_desc_head.next,
306                                                 struct isi_dma_desc, list);
307                         /* Delete the descriptor since now it is used */
308                         list_del_init(&desc->list);
309 
310                         /* Initialize the dma descriptor */
311                         desc->p_fbd->fb_address =
312                                         vb2_dma_contig_plane_dma_addr(vb, 0);
313                         desc->p_fbd->next_fbd_address = 0;
314                         set_dma_ctrl(desc->p_fbd, ISI_DMA_CTRL_WB);
315 
316                         buf->p_dma_desc = desc;
317                 }
318         }
319         return 0;
320 }
321 
322 static void buffer_cleanup(struct vb2_buffer *vb)
323 {
324         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
325         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
326         struct atmel_isi *isi = ici->priv;
327         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
328 
329         /* This descriptor is available now and we add to head list */
330         if (buf->p_dma_desc)
331                 list_add(&buf->p_dma_desc->list, &isi->dma_desc_head);
332 }
333 
334 static void start_dma(struct atmel_isi *isi, struct frame_buffer *buffer)
335 {
336         u32 ctrl, cfg1;
337 
338         cfg1 = isi_readl(isi, ISI_CFG1);
339         /* Enable irq: cxfr for the codec path, pxfr for the preview path */
340         isi_writel(isi, ISI_INTEN,
341                         ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
342 
343         /* Check if already in a frame */
344         if (isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) {
345                 dev_err(isi->soc_host.icd->parent, "Already in frame handling.\n");
346                 return;
347         }
348 
349         isi_writel(isi, ISI_DMA_C_DSCR, (u32)buffer->p_dma_desc->fbd_phys);
350         isi_writel(isi, ISI_DMA_C_CTRL, ISI_DMA_CTRL_FETCH | ISI_DMA_CTRL_DONE);
351         isi_writel(isi, ISI_DMA_CHER, ISI_DMA_CHSR_C_CH);
352 
353         cfg1 &= ~ISI_CFG1_FRATE_DIV_MASK;
354         /* Enable linked list */
355         cfg1 |= isi->pdata.frate | ISI_CFG1_DISCR;
356 
357         /* Enable codec path and ISI */
358         ctrl = ISI_CTRL_CDC | ISI_CTRL_EN;
359         isi_writel(isi, ISI_CTRL, ctrl);
360         isi_writel(isi, ISI_CFG1, cfg1);
361 }
362 
363 static void buffer_queue(struct vb2_buffer *vb)
364 {
365         struct soc_camera_device *icd = soc_camera_from_vb2q(vb->vb2_queue);
366         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
367         struct atmel_isi *isi = ici->priv;
368         struct frame_buffer *buf = container_of(vb, struct frame_buffer, vb);
369         unsigned long flags = 0;
370 
371         spin_lock_irqsave(&isi->lock, flags);
372         list_add_tail(&buf->list, &isi->video_buffer_list);
373 
374         if (isi->active == NULL) {
375                 isi->active = buf;
376                 if (vb2_is_streaming(vb->vb2_queue))
377                         start_dma(isi, buf);
378         }
379         spin_unlock_irqrestore(&isi->lock, flags);
380 }
381 
382 static int start_streaming(struct vb2_queue *vq, unsigned int count)
383 {
384         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
385         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
386         struct atmel_isi *isi = ici->priv;
387         int ret;
388 
389         /* Reset ISI */
390         ret = atmel_isi_wait_status(isi, WAIT_ISI_RESET);
391         if (ret < 0) {
392                 dev_err(icd->parent, "Reset ISI timed out\n");
393                 return ret;
394         }
395         /* Disable all interrupts */
396         isi_writel(isi, ISI_INTDIS, (u32)~0UL);
397 
398         spin_lock_irq(&isi->lock);
399         /* Clear any pending interrupt */
400         isi_readl(isi, ISI_STATUS);
401 
402         if (count)
403                 start_dma(isi, isi->active);
404         spin_unlock_irq(&isi->lock);
405 
406         return 0;
407 }
408 
409 /* abort streaming and wait for last buffer */
410 static void stop_streaming(struct vb2_queue *vq)
411 {
412         struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
413         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
414         struct atmel_isi *isi = ici->priv;
415         struct frame_buffer *buf, *node;
416         int ret = 0;
417         unsigned long timeout;
418 
419         spin_lock_irq(&isi->lock);
420         isi->active = NULL;
421         /* Release all active buffers */
422         list_for_each_entry_safe(buf, node, &isi->video_buffer_list, list) {
423                 list_del_init(&buf->list);
424                 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
425         }
426         spin_unlock_irq(&isi->lock);
427 
428         timeout = jiffies + FRAME_INTERVAL_MILLI_SEC * HZ;
429         /* Wait until the end of the current frame. */
430         while ((isi_readl(isi, ISI_STATUS) & ISI_CTRL_CDC) &&
431                         time_before(jiffies, timeout))
432                 msleep(1);
433 
434         if (time_after(jiffies, timeout)) {
435                 dev_err(icd->parent,
436                         "Timeout waiting for finishing codec request\n");
437                 return;
438         }
439 
440         /* Disable interrupts */
441         isi_writel(isi, ISI_INTDIS,
442                         ISI_SR_CXFR_DONE | ISI_SR_PXFR_DONE);
443 
444         /* Disable ISI and wait for it is done */
445         ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
446         if (ret < 0)
447                 dev_err(icd->parent, "Disable ISI timed out\n");
448 }
449 
450 static struct vb2_ops isi_video_qops = {
451         .queue_setup            = queue_setup,
452         .buf_init               = buffer_init,
453         .buf_prepare            = buffer_prepare,
454         .buf_cleanup            = buffer_cleanup,
455         .buf_queue              = buffer_queue,
456         .start_streaming        = start_streaming,
457         .stop_streaming         = stop_streaming,
458         .wait_prepare           = soc_camera_unlock,
459         .wait_finish            = soc_camera_lock,
460 };
461 
462 /* ------------------------------------------------------------------
463         SOC camera operations for the device
464    ------------------------------------------------------------------*/
465 static int isi_camera_init_videobuf(struct vb2_queue *q,
466                                      struct soc_camera_device *icd)
467 {
468         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
469         q->io_modes = VB2_MMAP;
470         q->drv_priv = icd;
471         q->buf_struct_size = sizeof(struct frame_buffer);
472         q->ops = &isi_video_qops;
473         q->mem_ops = &vb2_dma_contig_memops;
474         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
475 
476         return vb2_queue_init(q);
477 }
478 
479 static int isi_camera_set_fmt(struct soc_camera_device *icd,
480                               struct v4l2_format *f)
481 {
482         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
483         struct atmel_isi *isi = ici->priv;
484         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
485         const struct soc_camera_format_xlate *xlate;
486         struct v4l2_pix_format *pix = &f->fmt.pix;
487         struct v4l2_mbus_framefmt mf;
488         int ret;
489 
490         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
491         if (!xlate) {
492                 dev_warn(icd->parent, "Format %x not found\n",
493                          pix->pixelformat);
494                 return -EINVAL;
495         }
496 
497         dev_dbg(icd->parent, "Plan to set format %dx%d\n",
498                         pix->width, pix->height);
499 
500         mf.width        = pix->width;
501         mf.height       = pix->height;
502         mf.field        = pix->field;
503         mf.colorspace   = pix->colorspace;
504         mf.code         = xlate->code;
505 
506         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
507         if (ret < 0)
508                 return ret;
509 
510         if (mf.code != xlate->code)
511                 return -EINVAL;
512 
513         ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
514         if (ret < 0)
515                 return ret;
516 
517         pix->width              = mf.width;
518         pix->height             = mf.height;
519         pix->field              = mf.field;
520         pix->colorspace         = mf.colorspace;
521         icd->current_fmt        = xlate;
522 
523         dev_dbg(icd->parent, "Finally set format %dx%d\n",
524                 pix->width, pix->height);
525 
526         return ret;
527 }
528 
529 static int isi_camera_try_fmt(struct soc_camera_device *icd,
530                               struct v4l2_format *f)
531 {
532         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
533         const struct soc_camera_format_xlate *xlate;
534         struct v4l2_pix_format *pix = &f->fmt.pix;
535         struct v4l2_mbus_framefmt mf;
536         u32 pixfmt = pix->pixelformat;
537         int ret;
538 
539         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
540         if (pixfmt && !xlate) {
541                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
542                 return -EINVAL;
543         }
544 
545         /* limit to Atmel ISI hardware capabilities */
546         if (pix->height > MAX_SUPPORT_HEIGHT)
547                 pix->height = MAX_SUPPORT_HEIGHT;
548         if (pix->width > MAX_SUPPORT_WIDTH)
549                 pix->width = MAX_SUPPORT_WIDTH;
550 
551         /* limit to sensor capabilities */
552         mf.width        = pix->width;
553         mf.height       = pix->height;
554         mf.field        = pix->field;
555         mf.colorspace   = pix->colorspace;
556         mf.code         = xlate->code;
557 
558         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
559         if (ret < 0)
560                 return ret;
561 
562         pix->width      = mf.width;
563         pix->height     = mf.height;
564         pix->colorspace = mf.colorspace;
565 
566         switch (mf.field) {
567         case V4L2_FIELD_ANY:
568                 pix->field = V4L2_FIELD_NONE;
569                 break;
570         case V4L2_FIELD_NONE:
571                 break;
572         default:
573                 dev_err(icd->parent, "Field type %d unsupported.\n",
574                         mf.field);
575                 ret = -EINVAL;
576         }
577 
578         return ret;
579 }
580 
581 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
582         {
583                 .fourcc                 = V4L2_PIX_FMT_YUYV,
584                 .name                   = "Packed YUV422 16 bit",
585                 .bits_per_sample        = 8,
586                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
587                 .order                  = SOC_MBUS_ORDER_LE,
588                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
589         },
590 };
591 
592 /* This will be corrected as we get more formats */
593 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
594 {
595         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
596                 (fmt->bits_per_sample == 8 &&
597                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
598                 (fmt->bits_per_sample > 8 &&
599                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
600 }
601 
602 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER |       \
603                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
604                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
605                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
606                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
607                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
608                 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
609                 V4L2_MBUS_DATA_ACTIVE_HIGH)
610 
611 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
612                                     unsigned char buswidth)
613 {
614         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
615         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
616         struct atmel_isi *isi = ici->priv;
617         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
618         unsigned long common_flags;
619         int ret;
620 
621         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
622         if (!ret) {
623                 common_flags = soc_mbus_config_compatible(&cfg,
624                                                           ISI_BUS_PARAM);
625                 if (!common_flags) {
626                         dev_warn(icd->parent,
627                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
628                                  cfg.flags, ISI_BUS_PARAM);
629                         return -EINVAL;
630                 }
631         } else if (ret != -ENOIOCTLCMD) {
632                 return ret;
633         }
634 
635         if ((1 << (buswidth - 1)) & isi->width_flags)
636                 return 0;
637         return -EINVAL;
638 }
639 
640 
641 static int isi_camera_get_formats(struct soc_camera_device *icd,
642                                   unsigned int idx,
643                                   struct soc_camera_format_xlate *xlate)
644 {
645         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
646         int formats = 0, ret;
647         /* sensor format */
648         enum v4l2_mbus_pixelcode code;
649         /* soc camera host format */
650         const struct soc_mbus_pixelfmt *fmt;
651 
652         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
653         if (ret < 0)
654                 /* No more formats */
655                 return 0;
656 
657         fmt = soc_mbus_get_fmtdesc(code);
658         if (!fmt) {
659                 dev_err(icd->parent,
660                         "Invalid format code #%u: %d\n", idx, code);
661                 return 0;
662         }
663 
664         /* This also checks support for the requested bits-per-sample */
665         ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
666         if (ret < 0) {
667                 dev_err(icd->parent,
668                         "Fail to try the bus parameters.\n");
669                 return 0;
670         }
671 
672         switch (code) {
673         case V4L2_MBUS_FMT_UYVY8_2X8:
674         case V4L2_MBUS_FMT_VYUY8_2X8:
675         case V4L2_MBUS_FMT_YUYV8_2X8:
676         case V4L2_MBUS_FMT_YVYU8_2X8:
677                 formats++;
678                 if (xlate) {
679                         xlate->host_fmt = &isi_camera_formats[0];
680                         xlate->code     = code;
681                         xlate++;
682                         dev_dbg(icd->parent, "Providing format %s using code %d\n",
683                                 isi_camera_formats[0].name, code);
684                 }
685                 break;
686         default:
687                 if (!isi_camera_packing_supported(fmt))
688                         return 0;
689                 if (xlate)
690                         dev_dbg(icd->parent,
691                                 "Providing format %s in pass-through mode\n",
692                                 fmt->name);
693         }
694 
695         /* Generic pass-through */
696         formats++;
697         if (xlate) {
698                 xlate->host_fmt = fmt;
699                 xlate->code     = code;
700                 xlate++;
701         }
702 
703         return formats;
704 }
705 
706 static int isi_camera_add_device(struct soc_camera_device *icd)
707 {
708         dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
709                  icd->devnum);
710 
711         return 0;
712 }
713 
714 static void isi_camera_remove_device(struct soc_camera_device *icd)
715 {
716         dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
717                  icd->devnum);
718 }
719 
720 /* Called with .host_lock held */
721 static int isi_camera_clock_start(struct soc_camera_host *ici)
722 {
723         struct atmel_isi *isi = ici->priv;
724         int ret;
725 
726         ret = clk_prepare_enable(isi->pclk);
727         if (ret)
728                 return ret;
729 
730         if (!IS_ERR(isi->mck)) {
731                 ret = clk_prepare_enable(isi->mck);
732                 if (ret) {
733                         clk_disable_unprepare(isi->pclk);
734                         return ret;
735                 }
736         }
737 
738         return 0;
739 }
740 
741 /* Called with .host_lock held */
742 static void isi_camera_clock_stop(struct soc_camera_host *ici)
743 {
744         struct atmel_isi *isi = ici->priv;
745 
746         if (!IS_ERR(isi->mck))
747                 clk_disable_unprepare(isi->mck);
748         clk_disable_unprepare(isi->pclk);
749 }
750 
751 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
752 {
753         struct soc_camera_device *icd = file->private_data;
754 
755         return vb2_poll(&icd->vb2_vidq, file, pt);
756 }
757 
758 static int isi_camera_querycap(struct soc_camera_host *ici,
759                                struct v4l2_capability *cap)
760 {
761         strcpy(cap->driver, "atmel-isi");
762         strcpy(cap->card, "Atmel Image Sensor Interface");
763         cap->capabilities = (V4L2_CAP_VIDEO_CAPTURE |
764                                 V4L2_CAP_STREAMING);
765         return 0;
766 }
767 
768 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
769 {
770         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
771         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
772         struct atmel_isi *isi = ici->priv;
773         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
774         unsigned long common_flags;
775         int ret;
776         u32 cfg1 = 0;
777 
778         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
779         if (!ret) {
780                 common_flags = soc_mbus_config_compatible(&cfg,
781                                                           ISI_BUS_PARAM);
782                 if (!common_flags) {
783                         dev_warn(icd->parent,
784                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
785                                  cfg.flags, ISI_BUS_PARAM);
786                         return -EINVAL;
787                 }
788         } else if (ret != -ENOIOCTLCMD) {
789                 return ret;
790         } else {
791                 common_flags = ISI_BUS_PARAM;
792         }
793         dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
794                 cfg.flags, ISI_BUS_PARAM, common_flags);
795 
796         /* Make choises, based on platform preferences */
797         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
798             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
799                 if (isi->pdata.hsync_act_low)
800                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
801                 else
802                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
803         }
804 
805         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
806             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
807                 if (isi->pdata.vsync_act_low)
808                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
809                 else
810                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
811         }
812 
813         if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
814             (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
815                 if (isi->pdata.pclk_act_falling)
816                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
817                 else
818                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
819         }
820 
821         cfg.flags = common_flags;
822         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
823         if (ret < 0 && ret != -ENOIOCTLCMD) {
824                 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
825                         common_flags, ret);
826                 return ret;
827         }
828 
829         /* set bus param for ISI */
830         if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
831                 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
832         if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
833                 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
834         if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
835                 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
836 
837         if (isi->pdata.has_emb_sync)
838                 cfg1 |= ISI_CFG1_EMB_SYNC;
839         if (isi->pdata.full_mode)
840                 cfg1 |= ISI_CFG1_FULL_MODE;
841 
842         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
843         isi_writel(isi, ISI_CFG1, cfg1);
844 
845         return 0;
846 }
847 
848 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
849         .owner          = THIS_MODULE,
850         .add            = isi_camera_add_device,
851         .remove         = isi_camera_remove_device,
852         .clock_start    = isi_camera_clock_start,
853         .clock_stop     = isi_camera_clock_stop,
854         .set_fmt        = isi_camera_set_fmt,
855         .try_fmt        = isi_camera_try_fmt,
856         .get_formats    = isi_camera_get_formats,
857         .init_videobuf2 = isi_camera_init_videobuf,
858         .poll           = isi_camera_poll,
859         .querycap       = isi_camera_querycap,
860         .set_bus_param  = isi_camera_set_bus_param,
861 };
862 
863 /* -----------------------------------------------------------------------*/
864 static int atmel_isi_remove(struct platform_device *pdev)
865 {
866         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
867         struct atmel_isi *isi = container_of(soc_host,
868                                         struct atmel_isi, soc_host);
869 
870         soc_camera_host_unregister(soc_host);
871         vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
872         dma_free_coherent(&pdev->dev,
873                         sizeof(struct fbd) * MAX_BUFFER_NUM,
874                         isi->p_fb_descriptors,
875                         isi->fb_descriptors_phys);
876 
877         return 0;
878 }
879 
880 static int atmel_isi_probe_dt(struct atmel_isi *isi,
881                         struct platform_device *pdev)
882 {
883         struct device_node *np= pdev->dev.of_node;
884         struct v4l2_of_endpoint ep;
885         int err;
886 
887         /* Default settings for ISI */
888         isi->pdata.full_mode = 1;
889         isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ;
890         isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
891 
892         np = of_graph_get_next_endpoint(np, NULL);
893         if (!np) {
894                 dev_err(&pdev->dev, "Could not find the endpoint\n");
895                 return -EINVAL;
896         }
897 
898         err = v4l2_of_parse_endpoint(np, &ep);
899         if (err) {
900                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
901                 goto err_probe_dt;
902         }
903 
904         switch (ep.bus.parallel.bus_width) {
905         case 8:
906                 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
907                 break;
908         case 10:
909                 isi->pdata.data_width_flags =
910                                 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
911                 break;
912         default:
913                 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
914                                 ep.bus.parallel.bus_width);
915                 err = -EINVAL;
916                 goto err_probe_dt;
917         }
918 
919 err_probe_dt:
920         of_node_put(np);
921 
922         return err;
923 }
924 
925 static int atmel_isi_probe(struct platform_device *pdev)
926 {
927         unsigned int irq;
928         struct atmel_isi *isi;
929         struct resource *regs;
930         int ret, i;
931         struct device *dev = &pdev->dev;
932         struct soc_camera_host *soc_host;
933         struct isi_platform_data *pdata;
934 
935         pdata = dev->platform_data;
936         if ((!pdata || !pdata->data_width_flags) && !pdev->dev.of_node) {
937                 dev_err(&pdev->dev,
938                         "No config available for Atmel ISI\n");
939                 return -EINVAL;
940         }
941 
942         isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
943         if (!isi) {
944                 dev_err(&pdev->dev, "Can't allocate interface!\n");
945                 return -ENOMEM;
946         }
947 
948         isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
949         if (IS_ERR(isi->pclk))
950                 return PTR_ERR(isi->pclk);
951 
952         if (pdata) {
953                 memcpy(&isi->pdata, pdata, sizeof(isi->pdata));
954         } else {
955                 ret = atmel_isi_probe_dt(isi, pdev);
956                 if (ret)
957                         return ret;
958         }
959 
960         isi->active = NULL;
961         spin_lock_init(&isi->lock);
962         INIT_LIST_HEAD(&isi->video_buffer_list);
963         INIT_LIST_HEAD(&isi->dma_desc_head);
964 
965         /* ISI_MCK is the sensor master clock. It should be handled by the
966          * sensor driver directly, as the ISI has no use for that clock. Make
967          * the clock optional here while platforms transition to the correct
968          * model.
969          */
970         isi->mck = devm_clk_get(dev, "isi_mck");
971         if (!IS_ERR(isi->mck)) {
972                 /* Set ISI_MCK's frequency, it should be faster than pixel
973                  * clock.
974                  */
975                 ret = clk_set_rate(isi->mck, isi->pdata.mck_hz);
976                 if (ret < 0)
977                         return ret;
978         }
979 
980         isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
981                                 sizeof(struct fbd) * MAX_BUFFER_NUM,
982                                 &isi->fb_descriptors_phys,
983                                 GFP_KERNEL);
984         if (!isi->p_fb_descriptors) {
985                 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
986                 return -ENOMEM;
987         }
988 
989         for (i = 0; i < MAX_BUFFER_NUM; i++) {
990                 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
991                 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
992                                         i * sizeof(struct fbd);
993                 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
994         }
995 
996         isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
997         if (IS_ERR(isi->alloc_ctx)) {
998                 ret = PTR_ERR(isi->alloc_ctx);
999                 goto err_alloc_ctx;
1000         }
1001 
1002         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1003         isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1004         if (IS_ERR(isi->regs)) {
1005                 ret = PTR_ERR(isi->regs);
1006                 goto err_ioremap;
1007         }
1008 
1009         if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1010                 isi->width_flags = 1 << 7;
1011         if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1012                 isi->width_flags |= 1 << 9;
1013 
1014         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1015 
1016         irq = platform_get_irq(pdev, 0);
1017         if (IS_ERR_VALUE(irq)) {
1018                 ret = irq;
1019                 goto err_req_irq;
1020         }
1021 
1022         ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1023         if (ret) {
1024                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1025                 goto err_req_irq;
1026         }
1027         isi->irq = irq;
1028 
1029         soc_host                = &isi->soc_host;
1030         soc_host->drv_name      = "isi-camera";
1031         soc_host->ops           = &isi_soc_camera_host_ops;
1032         soc_host->priv          = isi;
1033         soc_host->v4l2_dev.dev  = &pdev->dev;
1034         soc_host->nr            = pdev->id;
1035 
1036         if (isi->pdata.asd_sizes) {
1037                 soc_host->asd = isi->pdata.asd;
1038                 soc_host->asd_sizes = isi->pdata.asd_sizes;
1039         }
1040 
1041         ret = soc_camera_host_register(soc_host);
1042         if (ret) {
1043                 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1044                 goto err_register_soc_camera_host;
1045         }
1046         return 0;
1047 
1048 err_register_soc_camera_host:
1049 err_req_irq:
1050 err_ioremap:
1051         vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1052 err_alloc_ctx:
1053         dma_free_coherent(&pdev->dev,
1054                         sizeof(struct fbd) * MAX_BUFFER_NUM,
1055                         isi->p_fb_descriptors,
1056                         isi->fb_descriptors_phys);
1057 
1058         return ret;
1059 }
1060 
1061 static const struct of_device_id atmel_isi_of_match[] = {
1062         { .compatible = "atmel,at91sam9g45-isi" },
1063         { }
1064 };
1065 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1066 
1067 static struct platform_driver atmel_isi_driver = {
1068         .remove         = atmel_isi_remove,
1069         .driver         = {
1070                 .name = "atmel_isi",
1071                 .owner = THIS_MODULE,
1072                 .of_match_table = of_match_ptr(atmel_isi_of_match),
1073         },
1074 };
1075 
1076 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1077 
1078 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1079 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1080 MODULE_LICENSE("GPL");
1081 MODULE_SUPPORTED_DEVICE("video");
1082 

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