Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0

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, u32 code)
109 {
110         u32 cfg2, cr;
111 
112         switch (code) {
113         /* YUV, including grey */
114         case MEDIA_BUS_FMT_Y8_1X8:
115                 cr = ISI_CFG2_GRAYSCALE;
116                 break;
117         case MEDIA_BUS_FMT_VYUY8_2X8:
118                 cr = ISI_CFG2_YCC_SWAP_MODE_3;
119                 break;
120         case MEDIA_BUS_FMT_UYVY8_2X8:
121                 cr = ISI_CFG2_YCC_SWAP_MODE_2;
122                 break;
123         case MEDIA_BUS_FMT_YVYU8_2X8:
124                 cr = ISI_CFG2_YCC_SWAP_MODE_1;
125                 break;
126         case MEDIA_BUS_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           = vb2_ops_wait_prepare,
459         .wait_finish            = vb2_ops_wait_finish,
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         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
469 
470         q->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
471         q->io_modes = VB2_MMAP;
472         q->drv_priv = icd;
473         q->buf_struct_size = sizeof(struct frame_buffer);
474         q->ops = &isi_video_qops;
475         q->mem_ops = &vb2_dma_contig_memops;
476         q->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
477         q->lock = &ici->host_lock;
478 
479         return vb2_queue_init(q);
480 }
481 
482 static int isi_camera_set_fmt(struct soc_camera_device *icd,
483                               struct v4l2_format *f)
484 {
485         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
486         struct atmel_isi *isi = ici->priv;
487         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
488         const struct soc_camera_format_xlate *xlate;
489         struct v4l2_pix_format *pix = &f->fmt.pix;
490         struct v4l2_mbus_framefmt mf;
491         int ret;
492 
493         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
494         if (!xlate) {
495                 dev_warn(icd->parent, "Format %x not found\n",
496                          pix->pixelformat);
497                 return -EINVAL;
498         }
499 
500         dev_dbg(icd->parent, "Plan to set format %dx%d\n",
501                         pix->width, pix->height);
502 
503         mf.width        = pix->width;
504         mf.height       = pix->height;
505         mf.field        = pix->field;
506         mf.colorspace   = pix->colorspace;
507         mf.code         = xlate->code;
508 
509         ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
510         if (ret < 0)
511                 return ret;
512 
513         if (mf.code != xlate->code)
514                 return -EINVAL;
515 
516         ret = configure_geometry(isi, pix->width, pix->height, xlate->code);
517         if (ret < 0)
518                 return ret;
519 
520         pix->width              = mf.width;
521         pix->height             = mf.height;
522         pix->field              = mf.field;
523         pix->colorspace         = mf.colorspace;
524         icd->current_fmt        = xlate;
525 
526         dev_dbg(icd->parent, "Finally set format %dx%d\n",
527                 pix->width, pix->height);
528 
529         return ret;
530 }
531 
532 static int isi_camera_try_fmt(struct soc_camera_device *icd,
533                               struct v4l2_format *f)
534 {
535         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
536         const struct soc_camera_format_xlate *xlate;
537         struct v4l2_pix_format *pix = &f->fmt.pix;
538         struct v4l2_mbus_framefmt mf;
539         u32 pixfmt = pix->pixelformat;
540         int ret;
541 
542         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
543         if (pixfmt && !xlate) {
544                 dev_warn(icd->parent, "Format %x not found\n", pixfmt);
545                 return -EINVAL;
546         }
547 
548         /* limit to Atmel ISI hardware capabilities */
549         if (pix->height > MAX_SUPPORT_HEIGHT)
550                 pix->height = MAX_SUPPORT_HEIGHT;
551         if (pix->width > MAX_SUPPORT_WIDTH)
552                 pix->width = MAX_SUPPORT_WIDTH;
553 
554         /* limit to sensor capabilities */
555         mf.width        = pix->width;
556         mf.height       = pix->height;
557         mf.field        = pix->field;
558         mf.colorspace   = pix->colorspace;
559         mf.code         = xlate->code;
560 
561         ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
562         if (ret < 0)
563                 return ret;
564 
565         pix->width      = mf.width;
566         pix->height     = mf.height;
567         pix->colorspace = mf.colorspace;
568 
569         switch (mf.field) {
570         case V4L2_FIELD_ANY:
571                 pix->field = V4L2_FIELD_NONE;
572                 break;
573         case V4L2_FIELD_NONE:
574                 break;
575         default:
576                 dev_err(icd->parent, "Field type %d unsupported.\n",
577                         mf.field);
578                 ret = -EINVAL;
579         }
580 
581         return ret;
582 }
583 
584 static const struct soc_mbus_pixelfmt isi_camera_formats[] = {
585         {
586                 .fourcc                 = V4L2_PIX_FMT_YUYV,
587                 .name                   = "Packed YUV422 16 bit",
588                 .bits_per_sample        = 8,
589                 .packing                = SOC_MBUS_PACKING_2X8_PADHI,
590                 .order                  = SOC_MBUS_ORDER_LE,
591                 .layout                 = SOC_MBUS_LAYOUT_PACKED,
592         },
593 };
594 
595 /* This will be corrected as we get more formats */
596 static bool isi_camera_packing_supported(const struct soc_mbus_pixelfmt *fmt)
597 {
598         return  fmt->packing == SOC_MBUS_PACKING_NONE ||
599                 (fmt->bits_per_sample == 8 &&
600                  fmt->packing == SOC_MBUS_PACKING_2X8_PADHI) ||
601                 (fmt->bits_per_sample > 8 &&
602                  fmt->packing == SOC_MBUS_PACKING_EXTEND16);
603 }
604 
605 #define ISI_BUS_PARAM (V4L2_MBUS_MASTER |       \
606                 V4L2_MBUS_HSYNC_ACTIVE_HIGH |   \
607                 V4L2_MBUS_HSYNC_ACTIVE_LOW |    \
608                 V4L2_MBUS_VSYNC_ACTIVE_HIGH |   \
609                 V4L2_MBUS_VSYNC_ACTIVE_LOW |    \
610                 V4L2_MBUS_PCLK_SAMPLE_RISING |  \
611                 V4L2_MBUS_PCLK_SAMPLE_FALLING | \
612                 V4L2_MBUS_DATA_ACTIVE_HIGH)
613 
614 static int isi_camera_try_bus_param(struct soc_camera_device *icd,
615                                     unsigned char buswidth)
616 {
617         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
618         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
619         struct atmel_isi *isi = ici->priv;
620         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
621         unsigned long common_flags;
622         int ret;
623 
624         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
625         if (!ret) {
626                 common_flags = soc_mbus_config_compatible(&cfg,
627                                                           ISI_BUS_PARAM);
628                 if (!common_flags) {
629                         dev_warn(icd->parent,
630                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
631                                  cfg.flags, ISI_BUS_PARAM);
632                         return -EINVAL;
633                 }
634         } else if (ret != -ENOIOCTLCMD) {
635                 return ret;
636         }
637 
638         if ((1 << (buswidth - 1)) & isi->width_flags)
639                 return 0;
640         return -EINVAL;
641 }
642 
643 
644 static int isi_camera_get_formats(struct soc_camera_device *icd,
645                                   unsigned int idx,
646                                   struct soc_camera_format_xlate *xlate)
647 {
648         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
649         int formats = 0, ret;
650         /* sensor format */
651         u32 code;
652         /* soc camera host format */
653         const struct soc_mbus_pixelfmt *fmt;
654 
655         ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
656         if (ret < 0)
657                 /* No more formats */
658                 return 0;
659 
660         fmt = soc_mbus_get_fmtdesc(code);
661         if (!fmt) {
662                 dev_err(icd->parent,
663                         "Invalid format code #%u: %d\n", idx, code);
664                 return 0;
665         }
666 
667         /* This also checks support for the requested bits-per-sample */
668         ret = isi_camera_try_bus_param(icd, fmt->bits_per_sample);
669         if (ret < 0) {
670                 dev_err(icd->parent,
671                         "Fail to try the bus parameters.\n");
672                 return 0;
673         }
674 
675         switch (code) {
676         case MEDIA_BUS_FMT_UYVY8_2X8:
677         case MEDIA_BUS_FMT_VYUY8_2X8:
678         case MEDIA_BUS_FMT_YUYV8_2X8:
679         case MEDIA_BUS_FMT_YVYU8_2X8:
680                 formats++;
681                 if (xlate) {
682                         xlate->host_fmt = &isi_camera_formats[0];
683                         xlate->code     = code;
684                         xlate++;
685                         dev_dbg(icd->parent, "Providing format %s using code %d\n",
686                                 isi_camera_formats[0].name, code);
687                 }
688                 break;
689         default:
690                 if (!isi_camera_packing_supported(fmt))
691                         return 0;
692                 if (xlate)
693                         dev_dbg(icd->parent,
694                                 "Providing format %s in pass-through mode\n",
695                                 fmt->name);
696         }
697 
698         /* Generic pass-through */
699         formats++;
700         if (xlate) {
701                 xlate->host_fmt = fmt;
702                 xlate->code     = code;
703                 xlate++;
704         }
705 
706         return formats;
707 }
708 
709 static int isi_camera_add_device(struct soc_camera_device *icd)
710 {
711         dev_dbg(icd->parent, "Atmel ISI Camera driver attached to camera %d\n",
712                  icd->devnum);
713 
714         return 0;
715 }
716 
717 static void isi_camera_remove_device(struct soc_camera_device *icd)
718 {
719         dev_dbg(icd->parent, "Atmel ISI Camera driver detached from camera %d\n",
720                  icd->devnum);
721 }
722 
723 /* Called with .host_lock held */
724 static int isi_camera_clock_start(struct soc_camera_host *ici)
725 {
726         struct atmel_isi *isi = ici->priv;
727         int ret;
728 
729         ret = clk_prepare_enable(isi->pclk);
730         if (ret)
731                 return ret;
732 
733         if (!IS_ERR(isi->mck)) {
734                 ret = clk_prepare_enable(isi->mck);
735                 if (ret) {
736                         clk_disable_unprepare(isi->pclk);
737                         return ret;
738                 }
739         }
740 
741         return 0;
742 }
743 
744 /* Called with .host_lock held */
745 static void isi_camera_clock_stop(struct soc_camera_host *ici)
746 {
747         struct atmel_isi *isi = ici->priv;
748 
749         if (!IS_ERR(isi->mck))
750                 clk_disable_unprepare(isi->mck);
751         clk_disable_unprepare(isi->pclk);
752 }
753 
754 static unsigned int isi_camera_poll(struct file *file, poll_table *pt)
755 {
756         struct soc_camera_device *icd = file->private_data;
757 
758         return vb2_poll(&icd->vb2_vidq, file, pt);
759 }
760 
761 static int isi_camera_querycap(struct soc_camera_host *ici,
762                                struct v4l2_capability *cap)
763 {
764         strcpy(cap->driver, "atmel-isi");
765         strcpy(cap->card, "Atmel Image Sensor Interface");
766         cap->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
767         cap->capabilities = cap->device_caps | V4L2_CAP_DEVICE_CAPS;
768 
769         return 0;
770 }
771 
772 static int isi_camera_set_bus_param(struct soc_camera_device *icd)
773 {
774         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
775         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
776         struct atmel_isi *isi = ici->priv;
777         struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
778         unsigned long common_flags;
779         int ret;
780         u32 cfg1 = 0;
781 
782         ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
783         if (!ret) {
784                 common_flags = soc_mbus_config_compatible(&cfg,
785                                                           ISI_BUS_PARAM);
786                 if (!common_flags) {
787                         dev_warn(icd->parent,
788                                  "Flags incompatible: camera 0x%x, host 0x%x\n",
789                                  cfg.flags, ISI_BUS_PARAM);
790                         return -EINVAL;
791                 }
792         } else if (ret != -ENOIOCTLCMD) {
793                 return ret;
794         } else {
795                 common_flags = ISI_BUS_PARAM;
796         }
797         dev_dbg(icd->parent, "Flags cam: 0x%x host: 0x%x common: 0x%lx\n",
798                 cfg.flags, ISI_BUS_PARAM, common_flags);
799 
800         /* Make choises, based on platform preferences */
801         if ((common_flags & V4L2_MBUS_HSYNC_ACTIVE_HIGH) &&
802             (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)) {
803                 if (isi->pdata.hsync_act_low)
804                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_HIGH;
805                 else
806                         common_flags &= ~V4L2_MBUS_HSYNC_ACTIVE_LOW;
807         }
808 
809         if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
810             (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
811                 if (isi->pdata.vsync_act_low)
812                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
813                 else
814                         common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
815         }
816 
817         if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
818             (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
819                 if (isi->pdata.pclk_act_falling)
820                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
821                 else
822                         common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
823         }
824 
825         cfg.flags = common_flags;
826         ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
827         if (ret < 0 && ret != -ENOIOCTLCMD) {
828                 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
829                         common_flags, ret);
830                 return ret;
831         }
832 
833         /* set bus param for ISI */
834         if (common_flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
835                 cfg1 |= ISI_CFG1_HSYNC_POL_ACTIVE_LOW;
836         if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
837                 cfg1 |= ISI_CFG1_VSYNC_POL_ACTIVE_LOW;
838         if (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
839                 cfg1 |= ISI_CFG1_PIXCLK_POL_ACTIVE_FALLING;
840 
841         if (isi->pdata.has_emb_sync)
842                 cfg1 |= ISI_CFG1_EMB_SYNC;
843         if (isi->pdata.full_mode)
844                 cfg1 |= ISI_CFG1_FULL_MODE;
845 
846         cfg1 |= ISI_CFG1_THMASK_BEATS_16;
847 
848         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
849         isi_writel(isi, ISI_CFG1, cfg1);
850 
851         return 0;
852 }
853 
854 static struct soc_camera_host_ops isi_soc_camera_host_ops = {
855         .owner          = THIS_MODULE,
856         .add            = isi_camera_add_device,
857         .remove         = isi_camera_remove_device,
858         .clock_start    = isi_camera_clock_start,
859         .clock_stop     = isi_camera_clock_stop,
860         .set_fmt        = isi_camera_set_fmt,
861         .try_fmt        = isi_camera_try_fmt,
862         .get_formats    = isi_camera_get_formats,
863         .init_videobuf2 = isi_camera_init_videobuf,
864         .poll           = isi_camera_poll,
865         .querycap       = isi_camera_querycap,
866         .set_bus_param  = isi_camera_set_bus_param,
867 };
868 
869 /* -----------------------------------------------------------------------*/
870 static int atmel_isi_remove(struct platform_device *pdev)
871 {
872         struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
873         struct atmel_isi *isi = container_of(soc_host,
874                                         struct atmel_isi, soc_host);
875 
876         soc_camera_host_unregister(soc_host);
877         vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
878         dma_free_coherent(&pdev->dev,
879                         sizeof(struct fbd) * MAX_BUFFER_NUM,
880                         isi->p_fb_descriptors,
881                         isi->fb_descriptors_phys);
882 
883         return 0;
884 }
885 
886 static int atmel_isi_probe_dt(struct atmel_isi *isi,
887                         struct platform_device *pdev)
888 {
889         struct device_node *np= pdev->dev.of_node;
890         struct v4l2_of_endpoint ep;
891         int err;
892 
893         /* Default settings for ISI */
894         isi->pdata.full_mode = 1;
895         isi->pdata.mck_hz = ISI_DEFAULT_MCLK_FREQ;
896         isi->pdata.frate = ISI_CFG1_FRATE_CAPTURE_ALL;
897 
898         np = of_graph_get_next_endpoint(np, NULL);
899         if (!np) {
900                 dev_err(&pdev->dev, "Could not find the endpoint\n");
901                 return -EINVAL;
902         }
903 
904         err = v4l2_of_parse_endpoint(np, &ep);
905         if (err) {
906                 dev_err(&pdev->dev, "Could not parse the endpoint\n");
907                 goto err_probe_dt;
908         }
909 
910         switch (ep.bus.parallel.bus_width) {
911         case 8:
912                 isi->pdata.data_width_flags = ISI_DATAWIDTH_8;
913                 break;
914         case 10:
915                 isi->pdata.data_width_flags =
916                                 ISI_DATAWIDTH_8 | ISI_DATAWIDTH_10;
917                 break;
918         default:
919                 dev_err(&pdev->dev, "Unsupported bus width: %d\n",
920                                 ep.bus.parallel.bus_width);
921                 err = -EINVAL;
922                 goto err_probe_dt;
923         }
924 
925 err_probe_dt:
926         of_node_put(np);
927 
928         return err;
929 }
930 
931 static int atmel_isi_probe(struct platform_device *pdev)
932 {
933         unsigned int irq;
934         struct atmel_isi *isi;
935         struct resource *regs;
936         int ret, i;
937         struct device *dev = &pdev->dev;
938         struct soc_camera_host *soc_host;
939         struct isi_platform_data *pdata;
940 
941         pdata = dev->platform_data;
942         if ((!pdata || !pdata->data_width_flags) && !pdev->dev.of_node) {
943                 dev_err(&pdev->dev,
944                         "No config available for Atmel ISI\n");
945                 return -EINVAL;
946         }
947 
948         isi = devm_kzalloc(&pdev->dev, sizeof(struct atmel_isi), GFP_KERNEL);
949         if (!isi) {
950                 dev_err(&pdev->dev, "Can't allocate interface!\n");
951                 return -ENOMEM;
952         }
953 
954         isi->pclk = devm_clk_get(&pdev->dev, "isi_clk");
955         if (IS_ERR(isi->pclk))
956                 return PTR_ERR(isi->pclk);
957 
958         if (pdata) {
959                 memcpy(&isi->pdata, pdata, sizeof(isi->pdata));
960         } else {
961                 ret = atmel_isi_probe_dt(isi, pdev);
962                 if (ret)
963                         return ret;
964         }
965 
966         isi->active = NULL;
967         spin_lock_init(&isi->lock);
968         INIT_LIST_HEAD(&isi->video_buffer_list);
969         INIT_LIST_HEAD(&isi->dma_desc_head);
970 
971         /* ISI_MCK is the sensor master clock. It should be handled by the
972          * sensor driver directly, as the ISI has no use for that clock. Make
973          * the clock optional here while platforms transition to the correct
974          * model.
975          */
976         isi->mck = devm_clk_get(dev, "isi_mck");
977         if (!IS_ERR(isi->mck)) {
978                 /* Set ISI_MCK's frequency, it should be faster than pixel
979                  * clock.
980                  */
981                 ret = clk_set_rate(isi->mck, isi->pdata.mck_hz);
982                 if (ret < 0)
983                         return ret;
984         }
985 
986         isi->p_fb_descriptors = dma_alloc_coherent(&pdev->dev,
987                                 sizeof(struct fbd) * MAX_BUFFER_NUM,
988                                 &isi->fb_descriptors_phys,
989                                 GFP_KERNEL);
990         if (!isi->p_fb_descriptors) {
991                 dev_err(&pdev->dev, "Can't allocate descriptors!\n");
992                 return -ENOMEM;
993         }
994 
995         for (i = 0; i < MAX_BUFFER_NUM; i++) {
996                 isi->dma_desc[i].p_fbd = isi->p_fb_descriptors + i;
997                 isi->dma_desc[i].fbd_phys = isi->fb_descriptors_phys +
998                                         i * sizeof(struct fbd);
999                 list_add(&isi->dma_desc[i].list, &isi->dma_desc_head);
1000         }
1001 
1002         isi->alloc_ctx = vb2_dma_contig_init_ctx(&pdev->dev);
1003         if (IS_ERR(isi->alloc_ctx)) {
1004                 ret = PTR_ERR(isi->alloc_ctx);
1005                 goto err_alloc_ctx;
1006         }
1007 
1008         regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1009         isi->regs = devm_ioremap_resource(&pdev->dev, regs);
1010         if (IS_ERR(isi->regs)) {
1011                 ret = PTR_ERR(isi->regs);
1012                 goto err_ioremap;
1013         }
1014 
1015         if (isi->pdata.data_width_flags & ISI_DATAWIDTH_8)
1016                 isi->width_flags = 1 << 7;
1017         if (isi->pdata.data_width_flags & ISI_DATAWIDTH_10)
1018                 isi->width_flags |= 1 << 9;
1019 
1020         isi_writel(isi, ISI_CTRL, ISI_CTRL_DIS);
1021 
1022         irq = platform_get_irq(pdev, 0);
1023         if (IS_ERR_VALUE(irq)) {
1024                 ret = irq;
1025                 goto err_req_irq;
1026         }
1027 
1028         ret = devm_request_irq(&pdev->dev, irq, isi_interrupt, 0, "isi", isi);
1029         if (ret) {
1030                 dev_err(&pdev->dev, "Unable to request irq %d\n", irq);
1031                 goto err_req_irq;
1032         }
1033         isi->irq = irq;
1034 
1035         soc_host                = &isi->soc_host;
1036         soc_host->drv_name      = "isi-camera";
1037         soc_host->ops           = &isi_soc_camera_host_ops;
1038         soc_host->priv          = isi;
1039         soc_host->v4l2_dev.dev  = &pdev->dev;
1040         soc_host->nr            = pdev->id;
1041 
1042         if (isi->pdata.asd_sizes) {
1043                 soc_host->asd = isi->pdata.asd;
1044                 soc_host->asd_sizes = isi->pdata.asd_sizes;
1045         }
1046 
1047         ret = soc_camera_host_register(soc_host);
1048         if (ret) {
1049                 dev_err(&pdev->dev, "Unable to register soc camera host\n");
1050                 goto err_register_soc_camera_host;
1051         }
1052         return 0;
1053 
1054 err_register_soc_camera_host:
1055 err_req_irq:
1056 err_ioremap:
1057         vb2_dma_contig_cleanup_ctx(isi->alloc_ctx);
1058 err_alloc_ctx:
1059         dma_free_coherent(&pdev->dev,
1060                         sizeof(struct fbd) * MAX_BUFFER_NUM,
1061                         isi->p_fb_descriptors,
1062                         isi->fb_descriptors_phys);
1063 
1064         return ret;
1065 }
1066 
1067 static const struct of_device_id atmel_isi_of_match[] = {
1068         { .compatible = "atmel,at91sam9g45-isi" },
1069         { }
1070 };
1071 MODULE_DEVICE_TABLE(of, atmel_isi_of_match);
1072 
1073 static struct platform_driver atmel_isi_driver = {
1074         .remove         = atmel_isi_remove,
1075         .driver         = {
1076                 .name = "atmel_isi",
1077                 .of_match_table = of_match_ptr(atmel_isi_of_match),
1078         },
1079 };
1080 
1081 module_platform_driver_probe(atmel_isi_driver, atmel_isi_probe);
1082 
1083 MODULE_AUTHOR("Josh Wu <josh.wu@atmel.com>");
1084 MODULE_DESCRIPTION("The V4L2 driver for Atmel Linux");
1085 MODULE_LICENSE("GPL");
1086 MODULE_SUPPORTED_DEVICE("video");
1087 

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