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Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd
[deliverable/linux.git] / drivers / media / video / mx1_camera.c
1 /*
2 * V4L2 Driver for i.MXL/i.MXL camera (CSI) host
3 *
4 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
5 * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
6 *
7 * Based on PXA SoC camera driver
8 * Copyright (C) 2006, Sascha Hauer, Pengutronix
9 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 */
15
16 #include <linux/clk.h>
17 #include <linux/delay.h>
18 #include <linux/device.h>
19 #include <linux/dma-mapping.h>
20 #include <linux/errno.h>
21 #include <linux/fs.h>
22 #include <linux/init.h>
23 #include <linux/interrupt.h>
24 #include <linux/io.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/module.h>
28 #include <linux/moduleparam.h>
29 #include <linux/mutex.h>
30 #include <linux/platform_device.h>
31 #include <linux/sched.h>
32 #include <linux/slab.h>
33 #include <linux/time.h>
34 #include <linux/videodev2.h>
35
36 #include <media/soc_camera.h>
37 #include <media/v4l2-common.h>
38 #include <media/v4l2-dev.h>
39 #include <media/videobuf-dma-contig.h>
40 #include <media/soc_mediabus.h>
41
42 #include <asm/dma.h>
43 #include <asm/fiq.h>
44 #include <mach/dma-mx1-mx2.h>
45 #include <mach/hardware.h>
46 #include <mach/mx1_camera.h>
47
48 /*
49 * CSI registers
50 */
51 #define CSICR1 0x00 /* CSI Control Register 1 */
52 #define CSISR 0x08 /* CSI Status Register */
53 #define CSIRXR 0x10 /* CSI RxFIFO Register */
54
55 #define CSICR1_RXFF_LEVEL(x) (((x) & 0x3) << 19)
56 #define CSICR1_SOF_POL (1 << 17)
57 #define CSICR1_SOF_INTEN (1 << 16)
58 #define CSICR1_MCLKDIV(x) (((x) & 0xf) << 12)
59 #define CSICR1_MCLKEN (1 << 9)
60 #define CSICR1_FCC (1 << 8)
61 #define CSICR1_BIG_ENDIAN (1 << 7)
62 #define CSICR1_CLR_RXFIFO (1 << 5)
63 #define CSICR1_GCLK_MODE (1 << 4)
64 #define CSICR1_DATA_POL (1 << 2)
65 #define CSICR1_REDGE (1 << 1)
66 #define CSICR1_EN (1 << 0)
67
68 #define CSISR_SFF_OR_INT (1 << 25)
69 #define CSISR_RFF_OR_INT (1 << 24)
70 #define CSISR_STATFF_INT (1 << 21)
71 #define CSISR_RXFF_INT (1 << 18)
72 #define CSISR_SOF_INT (1 << 16)
73 #define CSISR_DRDY (1 << 0)
74
75 #define DRIVER_VERSION "0.0.2"
76 #define DRIVER_NAME "mx1-camera"
77
78 #define CSI_IRQ_MASK (CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \
79 CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT)
80
81 #define CSI_BUS_FLAGS (SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \
82 SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \
83 SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \
84 SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW | \
85 SOCAM_DATAWIDTH_8)
86
87 #define MAX_VIDEO_MEM 16 /* Video memory limit in megabytes */
88
89 /*
90 * Structures
91 */
92
93 /* buffer for one video frame */
94 struct mx1_buffer {
95 /* common v4l buffer stuff -- must be first */
96 struct videobuf_buffer vb;
97 enum v4l2_mbus_pixelcode code;
98 int inwork;
99 };
100
101 /*
102 * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
103 * Interface. If anyone ever builds hardware to enable more than
104 * one camera, they will have to modify this driver too
105 */
106 struct mx1_camera_dev {
107 struct soc_camera_host soc_host;
108 struct soc_camera_device *icd;
109 struct mx1_camera_pdata *pdata;
110 struct mx1_buffer *active;
111 struct resource *res;
112 struct clk *clk;
113 struct list_head capture;
114
115 void __iomem *base;
116 int dma_chan;
117 unsigned int irq;
118 unsigned long mclk;
119
120 spinlock_t lock;
121 };
122
123 /*
124 * Videobuf operations
125 */
126 static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
127 unsigned int *size)
128 {
129 struct soc_camera_device *icd = vq->priv_data;
130 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
131 icd->current_fmt->host_fmt);
132
133 if (bytes_per_line < 0)
134 return bytes_per_line;
135
136 *size = bytes_per_line * icd->user_height;
137
138 if (!*count)
139 *count = 32;
140
141 if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
142 *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
143
144 dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size);
145
146 return 0;
147 }
148
149 static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
150 {
151 struct soc_camera_device *icd = vq->priv_data;
152 struct videobuf_buffer *vb = &buf->vb;
153
154 BUG_ON(in_interrupt());
155
156 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
157 vb, vb->baddr, vb->bsize);
158
159 /*
160 * This waits until this buffer is out of danger, i.e., until it is no
161 * longer in STATE_QUEUED or STATE_ACTIVE
162 */
163 videobuf_waiton(vq, vb, 0, 0);
164 videobuf_dma_contig_free(vq, vb);
165
166 vb->state = VIDEOBUF_NEEDS_INIT;
167 }
168
169 static int mx1_videobuf_prepare(struct videobuf_queue *vq,
170 struct videobuf_buffer *vb, enum v4l2_field field)
171 {
172 struct soc_camera_device *icd = vq->priv_data;
173 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
174 int ret;
175 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
176 icd->current_fmt->host_fmt);
177
178 if (bytes_per_line < 0)
179 return bytes_per_line;
180
181 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
182 vb, vb->baddr, vb->bsize);
183
184 /* Added list head initialization on alloc */
185 WARN_ON(!list_empty(&vb->queue));
186
187 BUG_ON(NULL == icd->current_fmt);
188
189 /*
190 * I think, in buf_prepare you only have to protect global data,
191 * the actual buffer is yours
192 */
193 buf->inwork = 1;
194
195 if (buf->code != icd->current_fmt->code ||
196 vb->width != icd->user_width ||
197 vb->height != icd->user_height ||
198 vb->field != field) {
199 buf->code = icd->current_fmt->code;
200 vb->width = icd->user_width;
201 vb->height = icd->user_height;
202 vb->field = field;
203 vb->state = VIDEOBUF_NEEDS_INIT;
204 }
205
206 vb->size = bytes_per_line * vb->height;
207 if (0 != vb->baddr && vb->bsize < vb->size) {
208 ret = -EINVAL;
209 goto out;
210 }
211
212 if (vb->state == VIDEOBUF_NEEDS_INIT) {
213 ret = videobuf_iolock(vq, vb, NULL);
214 if (ret)
215 goto fail;
216
217 vb->state = VIDEOBUF_PREPARED;
218 }
219
220 buf->inwork = 0;
221
222 return 0;
223
224 fail:
225 free_buffer(vq, buf);
226 out:
227 buf->inwork = 0;
228 return ret;
229 }
230
231 static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
232 {
233 struct videobuf_buffer *vbuf = &pcdev->active->vb;
234 struct device *dev = pcdev->icd->parent;
235 int ret;
236
237 if (unlikely(!pcdev->active)) {
238 dev_err(dev, "DMA End IRQ with no active buffer\n");
239 return -EFAULT;
240 }
241
242 /* setup sg list for future DMA */
243 ret = imx_dma_setup_single(pcdev->dma_chan,
244 videobuf_to_dma_contig(vbuf),
245 vbuf->size, pcdev->res->start +
246 CSIRXR, DMA_MODE_READ);
247 if (unlikely(ret))
248 dev_err(dev, "Failed to setup DMA sg list\n");
249
250 return ret;
251 }
252
253 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
254 static void mx1_videobuf_queue(struct videobuf_queue *vq,
255 struct videobuf_buffer *vb)
256 {
257 struct soc_camera_device *icd = vq->priv_data;
258 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
259 struct mx1_camera_dev *pcdev = ici->priv;
260 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
261
262 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
263 vb, vb->baddr, vb->bsize);
264
265 list_add_tail(&vb->queue, &pcdev->capture);
266
267 vb->state = VIDEOBUF_ACTIVE;
268
269 if (!pcdev->active) {
270 pcdev->active = buf;
271
272 /* setup sg list for future DMA */
273 if (!mx1_camera_setup_dma(pcdev)) {
274 unsigned int temp;
275 /* enable SOF irq */
276 temp = __raw_readl(pcdev->base + CSICR1) |
277 CSICR1_SOF_INTEN;
278 __raw_writel(temp, pcdev->base + CSICR1);
279 }
280 }
281 }
282
283 static void mx1_videobuf_release(struct videobuf_queue *vq,
284 struct videobuf_buffer *vb)
285 {
286 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
287 #ifdef DEBUG
288 struct soc_camera_device *icd = vq->priv_data;
289 struct device *dev = icd->parent;
290
291 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
292 vb, vb->baddr, vb->bsize);
293
294 switch (vb->state) {
295 case VIDEOBUF_ACTIVE:
296 dev_dbg(dev, "%s (active)\n", __func__);
297 break;
298 case VIDEOBUF_QUEUED:
299 dev_dbg(dev, "%s (queued)\n", __func__);
300 break;
301 case VIDEOBUF_PREPARED:
302 dev_dbg(dev, "%s (prepared)\n", __func__);
303 break;
304 default:
305 dev_dbg(dev, "%s (unknown)\n", __func__);
306 break;
307 }
308 #endif
309
310 free_buffer(vq, buf);
311 }
312
313 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
314 struct videobuf_buffer *vb,
315 struct mx1_buffer *buf)
316 {
317 /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
318 list_del_init(&vb->queue);
319 vb->state = VIDEOBUF_DONE;
320 do_gettimeofday(&vb->ts);
321 vb->field_count++;
322 wake_up(&vb->done);
323
324 if (list_empty(&pcdev->capture)) {
325 pcdev->active = NULL;
326 return;
327 }
328
329 pcdev->active = list_entry(pcdev->capture.next,
330 struct mx1_buffer, vb.queue);
331
332 /* setup sg list for future DMA */
333 if (likely(!mx1_camera_setup_dma(pcdev))) {
334 unsigned int temp;
335
336 /* enable SOF irq */
337 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
338 __raw_writel(temp, pcdev->base + CSICR1);
339 }
340 }
341
342 static void mx1_camera_dma_irq(int channel, void *data)
343 {
344 struct mx1_camera_dev *pcdev = data;
345 struct device *dev = pcdev->icd->parent;
346 struct mx1_buffer *buf;
347 struct videobuf_buffer *vb;
348 unsigned long flags;
349
350 spin_lock_irqsave(&pcdev->lock, flags);
351
352 imx_dma_disable(channel);
353
354 if (unlikely(!pcdev->active)) {
355 dev_err(dev, "DMA End IRQ with no active buffer\n");
356 goto out;
357 }
358
359 vb = &pcdev->active->vb;
360 buf = container_of(vb, struct mx1_buffer, vb);
361 WARN_ON(buf->inwork || list_empty(&vb->queue));
362 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
363 vb, vb->baddr, vb->bsize);
364
365 mx1_camera_wakeup(pcdev, vb, buf);
366 out:
367 spin_unlock_irqrestore(&pcdev->lock, flags);
368 }
369
370 static struct videobuf_queue_ops mx1_videobuf_ops = {
371 .buf_setup = mx1_videobuf_setup,
372 .buf_prepare = mx1_videobuf_prepare,
373 .buf_queue = mx1_videobuf_queue,
374 .buf_release = mx1_videobuf_release,
375 };
376
377 static void mx1_camera_init_videobuf(struct videobuf_queue *q,
378 struct soc_camera_device *icd)
379 {
380 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
381 struct mx1_camera_dev *pcdev = ici->priv;
382
383 videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->parent,
384 &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
385 V4L2_FIELD_NONE,
386 sizeof(struct mx1_buffer), icd, &icd->video_lock);
387 }
388
389 static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
390 {
391 unsigned int mclk = pcdev->mclk;
392 unsigned long div;
393 unsigned long lcdclk;
394
395 lcdclk = clk_get_rate(pcdev->clk);
396
397 /*
398 * We verify platform_mclk_10khz != 0, so if anyone breaks it, here
399 * they get a nice Oops
400 */
401 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
402
403 dev_dbg(pcdev->icd->parent,
404 "System clock %lukHz, target freq %dkHz, divisor %lu\n",
405 lcdclk / 1000, mclk / 1000, div);
406
407 return div;
408 }
409
410 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
411 {
412 unsigned int csicr1 = CSICR1_EN;
413
414 dev_dbg(pcdev->icd->parent, "Activate device\n");
415
416 clk_enable(pcdev->clk);
417
418 /* enable CSI before doing anything else */
419 __raw_writel(csicr1, pcdev->base + CSICR1);
420
421 csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
422 csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
423 csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
424
425 __raw_writel(csicr1, pcdev->base + CSICR1);
426 }
427
428 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
429 {
430 dev_dbg(pcdev->icd->parent, "Deactivate device\n");
431
432 /* Disable all CSI interface */
433 __raw_writel(0x00, pcdev->base + CSICR1);
434
435 clk_disable(pcdev->clk);
436 }
437
438 /*
439 * The following two functions absolutely depend on the fact, that
440 * there can be only one camera on i.MX1/i.MXL camera sensor interface
441 */
442 static int mx1_camera_add_device(struct soc_camera_device *icd)
443 {
444 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
445 struct mx1_camera_dev *pcdev = ici->priv;
446
447 if (pcdev->icd)
448 return -EBUSY;
449
450 dev_info(icd->parent, "MX1 Camera driver attached to camera %d\n",
451 icd->devnum);
452
453 mx1_camera_activate(pcdev);
454
455 pcdev->icd = icd;
456
457 return 0;
458 }
459
460 static void mx1_camera_remove_device(struct soc_camera_device *icd)
461 {
462 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
463 struct mx1_camera_dev *pcdev = ici->priv;
464 unsigned int csicr1;
465
466 BUG_ON(icd != pcdev->icd);
467
468 /* disable interrupts */
469 csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
470 __raw_writel(csicr1, pcdev->base + CSICR1);
471
472 /* Stop DMA engine */
473 imx_dma_disable(pcdev->dma_chan);
474
475 dev_info(icd->parent, "MX1 Camera driver detached from camera %d\n",
476 icd->devnum);
477
478 mx1_camera_deactivate(pcdev);
479
480 pcdev->icd = NULL;
481 }
482
483 static int mx1_camera_set_crop(struct soc_camera_device *icd,
484 struct v4l2_crop *a)
485 {
486 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
487
488 return v4l2_subdev_call(sd, video, s_crop, a);
489 }
490
491 static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
492 {
493 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
494 struct mx1_camera_dev *pcdev = ici->priv;
495 unsigned long camera_flags, common_flags;
496 unsigned int csicr1;
497 int ret;
498
499 camera_flags = icd->ops->query_bus_param(icd);
500
501 /* MX1 supports only 8bit buswidth */
502 common_flags = soc_camera_bus_param_compatible(camera_flags,
503 CSI_BUS_FLAGS);
504 if (!common_flags)
505 return -EINVAL;
506
507 /* Make choises, based on platform choice */
508 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
509 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
510 if (!pcdev->pdata ||
511 pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
512 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
513 else
514 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
515 }
516
517 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
518 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
519 if (!pcdev->pdata ||
520 pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
521 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
522 else
523 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
524 }
525
526 if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
527 (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
528 if (!pcdev->pdata ||
529 pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
530 common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
531 else
532 common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
533 }
534
535 ret = icd->ops->set_bus_param(icd, common_flags);
536 if (ret < 0)
537 return ret;
538
539 csicr1 = __raw_readl(pcdev->base + CSICR1);
540
541 if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
542 csicr1 |= CSICR1_REDGE;
543 if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
544 csicr1 |= CSICR1_SOF_POL;
545 if (common_flags & SOCAM_DATA_ACTIVE_LOW)
546 csicr1 |= CSICR1_DATA_POL;
547
548 __raw_writel(csicr1, pcdev->base + CSICR1);
549
550 return 0;
551 }
552
553 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
554 struct v4l2_format *f)
555 {
556 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
557 const struct soc_camera_format_xlate *xlate;
558 struct v4l2_pix_format *pix = &f->fmt.pix;
559 struct v4l2_mbus_framefmt mf;
560 int ret, buswidth;
561
562 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
563 if (!xlate) {
564 dev_warn(icd->parent, "Format %x not found\n",
565 pix->pixelformat);
566 return -EINVAL;
567 }
568
569 buswidth = xlate->host_fmt->bits_per_sample;
570 if (buswidth > 8) {
571 dev_warn(icd->parent,
572 "bits-per-sample %d for format %x unsupported\n",
573 buswidth, pix->pixelformat);
574 return -EINVAL;
575 }
576
577 mf.width = pix->width;
578 mf.height = pix->height;
579 mf.field = pix->field;
580 mf.colorspace = pix->colorspace;
581 mf.code = xlate->code;
582
583 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
584 if (ret < 0)
585 return ret;
586
587 if (mf.code != xlate->code)
588 return -EINVAL;
589
590 pix->width = mf.width;
591 pix->height = mf.height;
592 pix->field = mf.field;
593 pix->colorspace = mf.colorspace;
594 icd->current_fmt = xlate;
595
596 return ret;
597 }
598
599 static int mx1_camera_try_fmt(struct soc_camera_device *icd,
600 struct v4l2_format *f)
601 {
602 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
603 const struct soc_camera_format_xlate *xlate;
604 struct v4l2_pix_format *pix = &f->fmt.pix;
605 struct v4l2_mbus_framefmt mf;
606 int ret;
607 /* TODO: limit to mx1 hardware capabilities */
608
609 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
610 if (!xlate) {
611 dev_warn(icd->parent, "Format %x not found\n",
612 pix->pixelformat);
613 return -EINVAL;
614 }
615
616 mf.width = pix->width;
617 mf.height = pix->height;
618 mf.field = pix->field;
619 mf.colorspace = pix->colorspace;
620 mf.code = xlate->code;
621
622 /* limit to sensor capabilities */
623 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
624 if (ret < 0)
625 return ret;
626
627 pix->width = mf.width;
628 pix->height = mf.height;
629 pix->field = mf.field;
630 pix->colorspace = mf.colorspace;
631
632 return 0;
633 }
634
635 static int mx1_camera_reqbufs(struct soc_camera_device *icd,
636 struct v4l2_requestbuffers *p)
637 {
638 int i;
639
640 /*
641 * This is for locking debugging only. I removed spinlocks and now I
642 * check whether .prepare is ever called on a linked buffer, or whether
643 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
644 * it hadn't triggered
645 */
646 for (i = 0; i < p->count; i++) {
647 struct mx1_buffer *buf = container_of(icd->vb_vidq.bufs[i],
648 struct mx1_buffer, vb);
649 buf->inwork = 0;
650 INIT_LIST_HEAD(&buf->vb.queue);
651 }
652
653 return 0;
654 }
655
656 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
657 {
658 struct soc_camera_device *icd = file->private_data;
659 struct mx1_buffer *buf;
660
661 buf = list_entry(icd->vb_vidq.stream.next, struct mx1_buffer,
662 vb.stream);
663
664 poll_wait(file, &buf->vb.done, pt);
665
666 if (buf->vb.state == VIDEOBUF_DONE ||
667 buf->vb.state == VIDEOBUF_ERROR)
668 return POLLIN | POLLRDNORM;
669
670 return 0;
671 }
672
673 static int mx1_camera_querycap(struct soc_camera_host *ici,
674 struct v4l2_capability *cap)
675 {
676 /* cap->name is set by the friendly caller:-> */
677 strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
678 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
679
680 return 0;
681 }
682
683 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
684 .owner = THIS_MODULE,
685 .add = mx1_camera_add_device,
686 .remove = mx1_camera_remove_device,
687 .set_bus_param = mx1_camera_set_bus_param,
688 .set_crop = mx1_camera_set_crop,
689 .set_fmt = mx1_camera_set_fmt,
690 .try_fmt = mx1_camera_try_fmt,
691 .init_videobuf = mx1_camera_init_videobuf,
692 .reqbufs = mx1_camera_reqbufs,
693 .poll = mx1_camera_poll,
694 .querycap = mx1_camera_querycap,
695 };
696
697 static struct fiq_handler fh = {
698 .name = "csi_sof"
699 };
700
701 static int __init mx1_camera_probe(struct platform_device *pdev)
702 {
703 struct mx1_camera_dev *pcdev;
704 struct resource *res;
705 struct pt_regs regs;
706 struct clk *clk;
707 void __iomem *base;
708 unsigned int irq;
709 int err = 0;
710
711 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
712 irq = platform_get_irq(pdev, 0);
713 if (!res || (int)irq <= 0) {
714 err = -ENODEV;
715 goto exit;
716 }
717
718 clk = clk_get(&pdev->dev, "csi_clk");
719 if (IS_ERR(clk)) {
720 err = PTR_ERR(clk);
721 goto exit;
722 }
723
724 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
725 if (!pcdev) {
726 dev_err(&pdev->dev, "Could not allocate pcdev\n");
727 err = -ENOMEM;
728 goto exit_put_clk;
729 }
730
731 pcdev->res = res;
732 pcdev->clk = clk;
733
734 pcdev->pdata = pdev->dev.platform_data;
735
736 if (pcdev->pdata)
737 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
738
739 if (!pcdev->mclk) {
740 dev_warn(&pdev->dev,
741 "mclk_10khz == 0! Please, fix your platform data. "
742 "Using default 20MHz\n");
743 pcdev->mclk = 20000000;
744 }
745
746 INIT_LIST_HEAD(&pcdev->capture);
747 spin_lock_init(&pcdev->lock);
748
749 /*
750 * Request the regions.
751 */
752 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
753 err = -EBUSY;
754 goto exit_kfree;
755 }
756
757 base = ioremap(res->start, resource_size(res));
758 if (!base) {
759 err = -ENOMEM;
760 goto exit_release;
761 }
762 pcdev->irq = irq;
763 pcdev->base = base;
764
765 /* request dma */
766 pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
767 if (pcdev->dma_chan < 0) {
768 dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
769 err = -EBUSY;
770 goto exit_iounmap;
771 }
772 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
773
774 imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
775 pcdev);
776
777 imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
778 IMX_DMA_MEMSIZE_32, MX1_DMA_REQ_CSI_R, 0);
779 /* burst length : 16 words = 64 bytes */
780 imx_dma_config_burstlen(pcdev->dma_chan, 0);
781
782 /* request irq */
783 err = claim_fiq(&fh);
784 if (err) {
785 dev_err(&pdev->dev, "Camera interrupt register failed \n");
786 goto exit_free_dma;
787 }
788
789 set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
790 &mx1_camera_sof_fiq_start);
791
792 regs.ARM_r8 = (long)MX1_DMA_DIMR;
793 regs.ARM_r9 = (long)MX1_DMA_CCR(pcdev->dma_chan);
794 regs.ARM_r10 = (long)pcdev->base + CSICR1;
795 regs.ARM_fp = (long)pcdev->base + CSISR;
796 regs.ARM_sp = 1 << pcdev->dma_chan;
797 set_fiq_regs(&regs);
798
799 mxc_set_irq_fiq(irq, 1);
800 enable_fiq(irq);
801
802 pcdev->soc_host.drv_name = DRIVER_NAME;
803 pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
804 pcdev->soc_host.priv = pcdev;
805 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
806 pcdev->soc_host.nr = pdev->id;
807 err = soc_camera_host_register(&pcdev->soc_host);
808 if (err)
809 goto exit_free_irq;
810
811 dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
812
813 return 0;
814
815 exit_free_irq:
816 disable_fiq(irq);
817 mxc_set_irq_fiq(irq, 0);
818 release_fiq(&fh);
819 exit_free_dma:
820 imx_dma_free(pcdev->dma_chan);
821 exit_iounmap:
822 iounmap(base);
823 exit_release:
824 release_mem_region(res->start, resource_size(res));
825 exit_kfree:
826 kfree(pcdev);
827 exit_put_clk:
828 clk_put(clk);
829 exit:
830 return err;
831 }
832
833 static int __exit mx1_camera_remove(struct platform_device *pdev)
834 {
835 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
836 struct mx1_camera_dev *pcdev = container_of(soc_host,
837 struct mx1_camera_dev, soc_host);
838 struct resource *res;
839
840 imx_dma_free(pcdev->dma_chan);
841 disable_fiq(pcdev->irq);
842 mxc_set_irq_fiq(pcdev->irq, 0);
843 release_fiq(&fh);
844
845 clk_put(pcdev->clk);
846
847 soc_camera_host_unregister(soc_host);
848
849 iounmap(pcdev->base);
850
851 res = pcdev->res;
852 release_mem_region(res->start, resource_size(res));
853
854 kfree(pcdev);
855
856 dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
857
858 return 0;
859 }
860
861 static struct platform_driver mx1_camera_driver = {
862 .driver = {
863 .name = DRIVER_NAME,
864 },
865 .remove = __exit_p(mx1_camera_remove),
866 };
867
868 static int __init mx1_camera_init(void)
869 {
870 return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
871 }
872
873 static void __exit mx1_camera_exit(void)
874 {
875 return platform_driver_unregister(&mx1_camera_driver);
876 }
877
878 module_init(mx1_camera_init);
879 module_exit(mx1_camera_exit);
880
881 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
882 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
883 MODULE_LICENSE("GPL v2");
884 MODULE_VERSION(DRIVER_VERSION);
885 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux kernel - Deliverables
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