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Merge branch 'fixes-omap4-dsp' into fixes-non-critical
[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 (V4L2_MBUS_MASTER | V4L2_MBUS_HSYNC_ACTIVE_HIGH | \
82 V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW | \
83 V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | \
84 V4L2_MBUS_DATA_ACTIVE_HIGH | V4L2_MBUS_DATA_ACTIVE_LOW)
85
86 #define MAX_VIDEO_MEM 16 /* Video memory limit in megabytes */
87
88 /*
89 * Structures
90 */
91
92 /* buffer for one video frame */
93 struct mx1_buffer {
94 /* common v4l buffer stuff -- must be first */
95 struct videobuf_buffer vb;
96 enum v4l2_mbus_pixelcode code;
97 int inwork;
98 };
99
100 /*
101 * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
102 * Interface. If anyone ever builds hardware to enable more than
103 * one camera, they will have to modify this driver too
104 */
105 struct mx1_camera_dev {
106 struct soc_camera_host soc_host;
107 struct soc_camera_device *icd;
108 struct mx1_camera_pdata *pdata;
109 struct mx1_buffer *active;
110 struct resource *res;
111 struct clk *clk;
112 struct list_head capture;
113
114 void __iomem *base;
115 int dma_chan;
116 unsigned int irq;
117 unsigned long mclk;
118
119 spinlock_t lock;
120 };
121
122 /*
123 * Videobuf operations
124 */
125 static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
126 unsigned int *size)
127 {
128 struct soc_camera_device *icd = vq->priv_data;
129
130 *size = icd->sizeimage;
131
132 if (!*count)
133 *count = 32;
134
135 if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
136 *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
137
138 dev_dbg(icd->parent, "count=%d, size=%d\n", *count, *size);
139
140 return 0;
141 }
142
143 static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
144 {
145 struct soc_camera_device *icd = vq->priv_data;
146 struct videobuf_buffer *vb = &buf->vb;
147
148 BUG_ON(in_interrupt());
149
150 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
151 vb, vb->baddr, vb->bsize);
152
153 /*
154 * This waits until this buffer is out of danger, i.e., until it is no
155 * longer in STATE_QUEUED or STATE_ACTIVE
156 */
157 videobuf_waiton(vq, vb, 0, 0);
158 videobuf_dma_contig_free(vq, vb);
159
160 vb->state = VIDEOBUF_NEEDS_INIT;
161 }
162
163 static int mx1_videobuf_prepare(struct videobuf_queue *vq,
164 struct videobuf_buffer *vb, enum v4l2_field field)
165 {
166 struct soc_camera_device *icd = vq->priv_data;
167 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
168 int ret;
169
170 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
171 vb, vb->baddr, vb->bsize);
172
173 /* Added list head initialization on alloc */
174 WARN_ON(!list_empty(&vb->queue));
175
176 BUG_ON(NULL == icd->current_fmt);
177
178 /*
179 * I think, in buf_prepare you only have to protect global data,
180 * the actual buffer is yours
181 */
182 buf->inwork = 1;
183
184 if (buf->code != icd->current_fmt->code ||
185 vb->width != icd->user_width ||
186 vb->height != icd->user_height ||
187 vb->field != field) {
188 buf->code = icd->current_fmt->code;
189 vb->width = icd->user_width;
190 vb->height = icd->user_height;
191 vb->field = field;
192 vb->state = VIDEOBUF_NEEDS_INIT;
193 }
194
195 vb->size = icd->sizeimage;
196 if (0 != vb->baddr && vb->bsize < vb->size) {
197 ret = -EINVAL;
198 goto out;
199 }
200
201 if (vb->state == VIDEOBUF_NEEDS_INIT) {
202 ret = videobuf_iolock(vq, vb, NULL);
203 if (ret)
204 goto fail;
205
206 vb->state = VIDEOBUF_PREPARED;
207 }
208
209 buf->inwork = 0;
210
211 return 0;
212
213 fail:
214 free_buffer(vq, buf);
215 out:
216 buf->inwork = 0;
217 return ret;
218 }
219
220 static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
221 {
222 struct videobuf_buffer *vbuf = &pcdev->active->vb;
223 struct device *dev = pcdev->icd->parent;
224 int ret;
225
226 if (unlikely(!pcdev->active)) {
227 dev_err(dev, "DMA End IRQ with no active buffer\n");
228 return -EFAULT;
229 }
230
231 /* setup sg list for future DMA */
232 ret = imx_dma_setup_single(pcdev->dma_chan,
233 videobuf_to_dma_contig(vbuf),
234 vbuf->size, pcdev->res->start +
235 CSIRXR, DMA_MODE_READ);
236 if (unlikely(ret))
237 dev_err(dev, "Failed to setup DMA sg list\n");
238
239 return ret;
240 }
241
242 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
243 static void mx1_videobuf_queue(struct videobuf_queue *vq,
244 struct videobuf_buffer *vb)
245 {
246 struct soc_camera_device *icd = vq->priv_data;
247 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
248 struct mx1_camera_dev *pcdev = ici->priv;
249 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
250
251 dev_dbg(icd->parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
252 vb, vb->baddr, vb->bsize);
253
254 list_add_tail(&vb->queue, &pcdev->capture);
255
256 vb->state = VIDEOBUF_ACTIVE;
257
258 if (!pcdev->active) {
259 pcdev->active = buf;
260
261 /* setup sg list for future DMA */
262 if (!mx1_camera_setup_dma(pcdev)) {
263 unsigned int temp;
264 /* enable SOF irq */
265 temp = __raw_readl(pcdev->base + CSICR1) |
266 CSICR1_SOF_INTEN;
267 __raw_writel(temp, pcdev->base + CSICR1);
268 }
269 }
270 }
271
272 static void mx1_videobuf_release(struct videobuf_queue *vq,
273 struct videobuf_buffer *vb)
274 {
275 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
276 #ifdef DEBUG
277 struct soc_camera_device *icd = vq->priv_data;
278 struct device *dev = icd->parent;
279
280 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
281 vb, vb->baddr, vb->bsize);
282
283 switch (vb->state) {
284 case VIDEOBUF_ACTIVE:
285 dev_dbg(dev, "%s (active)\n", __func__);
286 break;
287 case VIDEOBUF_QUEUED:
288 dev_dbg(dev, "%s (queued)\n", __func__);
289 break;
290 case VIDEOBUF_PREPARED:
291 dev_dbg(dev, "%s (prepared)\n", __func__);
292 break;
293 default:
294 dev_dbg(dev, "%s (unknown)\n", __func__);
295 break;
296 }
297 #endif
298
299 free_buffer(vq, buf);
300 }
301
302 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
303 struct videobuf_buffer *vb,
304 struct mx1_buffer *buf)
305 {
306 /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
307 list_del_init(&vb->queue);
308 vb->state = VIDEOBUF_DONE;
309 do_gettimeofday(&vb->ts);
310 vb->field_count++;
311 wake_up(&vb->done);
312
313 if (list_empty(&pcdev->capture)) {
314 pcdev->active = NULL;
315 return;
316 }
317
318 pcdev->active = list_entry(pcdev->capture.next,
319 struct mx1_buffer, vb.queue);
320
321 /* setup sg list for future DMA */
322 if (likely(!mx1_camera_setup_dma(pcdev))) {
323 unsigned int temp;
324
325 /* enable SOF irq */
326 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
327 __raw_writel(temp, pcdev->base + CSICR1);
328 }
329 }
330
331 static void mx1_camera_dma_irq(int channel, void *data)
332 {
333 struct mx1_camera_dev *pcdev = data;
334 struct device *dev = pcdev->icd->parent;
335 struct mx1_buffer *buf;
336 struct videobuf_buffer *vb;
337 unsigned long flags;
338
339 spin_lock_irqsave(&pcdev->lock, flags);
340
341 imx_dma_disable(channel);
342
343 if (unlikely(!pcdev->active)) {
344 dev_err(dev, "DMA End IRQ with no active buffer\n");
345 goto out;
346 }
347
348 vb = &pcdev->active->vb;
349 buf = container_of(vb, struct mx1_buffer, vb);
350 WARN_ON(buf->inwork || list_empty(&vb->queue));
351 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
352 vb, vb->baddr, vb->bsize);
353
354 mx1_camera_wakeup(pcdev, vb, buf);
355 out:
356 spin_unlock_irqrestore(&pcdev->lock, flags);
357 }
358
359 static struct videobuf_queue_ops mx1_videobuf_ops = {
360 .buf_setup = mx1_videobuf_setup,
361 .buf_prepare = mx1_videobuf_prepare,
362 .buf_queue = mx1_videobuf_queue,
363 .buf_release = mx1_videobuf_release,
364 };
365
366 static void mx1_camera_init_videobuf(struct videobuf_queue *q,
367 struct soc_camera_device *icd)
368 {
369 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
370 struct mx1_camera_dev *pcdev = ici->priv;
371
372 videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->parent,
373 &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
374 V4L2_FIELD_NONE,
375 sizeof(struct mx1_buffer), icd, &icd->video_lock);
376 }
377
378 static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
379 {
380 unsigned int mclk = pcdev->mclk;
381 unsigned long div;
382 unsigned long lcdclk;
383
384 lcdclk = clk_get_rate(pcdev->clk);
385
386 /*
387 * We verify platform_mclk_10khz != 0, so if anyone breaks it, here
388 * they get a nice Oops
389 */
390 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
391
392 dev_dbg(pcdev->icd->parent,
393 "System clock %lukHz, target freq %dkHz, divisor %lu\n",
394 lcdclk / 1000, mclk / 1000, div);
395
396 return div;
397 }
398
399 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
400 {
401 unsigned int csicr1 = CSICR1_EN;
402
403 dev_dbg(pcdev->icd->parent, "Activate device\n");
404
405 clk_enable(pcdev->clk);
406
407 /* enable CSI before doing anything else */
408 __raw_writel(csicr1, pcdev->base + CSICR1);
409
410 csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
411 csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
412 csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
413
414 __raw_writel(csicr1, pcdev->base + CSICR1);
415 }
416
417 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
418 {
419 dev_dbg(pcdev->icd->parent, "Deactivate device\n");
420
421 /* Disable all CSI interface */
422 __raw_writel(0x00, pcdev->base + CSICR1);
423
424 clk_disable(pcdev->clk);
425 }
426
427 /*
428 * The following two functions absolutely depend on the fact, that
429 * there can be only one camera on i.MX1/i.MXL camera sensor interface
430 */
431 static int mx1_camera_add_device(struct soc_camera_device *icd)
432 {
433 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
434 struct mx1_camera_dev *pcdev = ici->priv;
435
436 if (pcdev->icd)
437 return -EBUSY;
438
439 dev_info(icd->parent, "MX1 Camera driver attached to camera %d\n",
440 icd->devnum);
441
442 mx1_camera_activate(pcdev);
443
444 pcdev->icd = icd;
445
446 return 0;
447 }
448
449 static void mx1_camera_remove_device(struct soc_camera_device *icd)
450 {
451 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
452 struct mx1_camera_dev *pcdev = ici->priv;
453 unsigned int csicr1;
454
455 BUG_ON(icd != pcdev->icd);
456
457 /* disable interrupts */
458 csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
459 __raw_writel(csicr1, pcdev->base + CSICR1);
460
461 /* Stop DMA engine */
462 imx_dma_disable(pcdev->dma_chan);
463
464 dev_info(icd->parent, "MX1 Camera driver detached from camera %d\n",
465 icd->devnum);
466
467 mx1_camera_deactivate(pcdev);
468
469 pcdev->icd = NULL;
470 }
471
472 static int mx1_camera_set_crop(struct soc_camera_device *icd,
473 struct v4l2_crop *a)
474 {
475 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
476
477 return v4l2_subdev_call(sd, video, s_crop, a);
478 }
479
480 static int mx1_camera_set_bus_param(struct soc_camera_device *icd)
481 {
482 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
483 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
484 struct mx1_camera_dev *pcdev = ici->priv;
485 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
486 unsigned long common_flags;
487 unsigned int csicr1;
488 int ret;
489
490 /* MX1 supports only 8bit buswidth */
491 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
492 if (!ret) {
493 common_flags = soc_mbus_config_compatible(&cfg, CSI_BUS_FLAGS);
494 if (!common_flags) {
495 dev_warn(icd->parent,
496 "Flags incompatible: camera 0x%x, host 0x%x\n",
497 cfg.flags, CSI_BUS_FLAGS);
498 return -EINVAL;
499 }
500 } else if (ret != -ENOIOCTLCMD) {
501 return ret;
502 } else {
503 common_flags = CSI_BUS_FLAGS;
504 }
505
506 /* Make choises, based on platform choice */
507 if ((common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH) &&
508 (common_flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)) {
509 if (!pcdev->pdata ||
510 pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
511 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_LOW;
512 else
513 common_flags &= ~V4L2_MBUS_VSYNC_ACTIVE_HIGH;
514 }
515
516 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
517 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
518 if (!pcdev->pdata ||
519 pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
520 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
521 else
522 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
523 }
524
525 if ((common_flags & V4L2_MBUS_DATA_ACTIVE_HIGH) &&
526 (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)) {
527 if (!pcdev->pdata ||
528 pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
529 common_flags &= ~V4L2_MBUS_DATA_ACTIVE_LOW;
530 else
531 common_flags &= ~V4L2_MBUS_DATA_ACTIVE_HIGH;
532 }
533
534 cfg.flags = common_flags;
535 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
536 if (ret < 0 && ret != -ENOIOCTLCMD) {
537 dev_dbg(icd->parent, "camera s_mbus_config(0x%lx) returned %d\n",
538 common_flags, ret);
539 return ret;
540 }
541
542 csicr1 = __raw_readl(pcdev->base + CSICR1);
543
544 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
545 csicr1 |= CSICR1_REDGE;
546 if (common_flags & V4L2_MBUS_VSYNC_ACTIVE_HIGH)
547 csicr1 |= CSICR1_SOF_POL;
548 if (common_flags & V4L2_MBUS_DATA_ACTIVE_LOW)
549 csicr1 |= CSICR1_DATA_POL;
550
551 __raw_writel(csicr1, pcdev->base + CSICR1);
552
553 return 0;
554 }
555
556 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
557 struct v4l2_format *f)
558 {
559 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
560 const struct soc_camera_format_xlate *xlate;
561 struct v4l2_pix_format *pix = &f->fmt.pix;
562 struct v4l2_mbus_framefmt mf;
563 int ret, buswidth;
564
565 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
566 if (!xlate) {
567 dev_warn(icd->parent, "Format %x not found\n",
568 pix->pixelformat);
569 return -EINVAL;
570 }
571
572 buswidth = xlate->host_fmt->bits_per_sample;
573 if (buswidth > 8) {
574 dev_warn(icd->parent,
575 "bits-per-sample %d for format %x unsupported\n",
576 buswidth, pix->pixelformat);
577 return -EINVAL;
578 }
579
580 mf.width = pix->width;
581 mf.height = pix->height;
582 mf.field = pix->field;
583 mf.colorspace = pix->colorspace;
584 mf.code = xlate->code;
585
586 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
587 if (ret < 0)
588 return ret;
589
590 if (mf.code != xlate->code)
591 return -EINVAL;
592
593 pix->width = mf.width;
594 pix->height = mf.height;
595 pix->field = mf.field;
596 pix->colorspace = mf.colorspace;
597 icd->current_fmt = xlate;
598
599 return ret;
600 }
601
602 static int mx1_camera_try_fmt(struct soc_camera_device *icd,
603 struct v4l2_format *f)
604 {
605 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
606 const struct soc_camera_format_xlate *xlate;
607 struct v4l2_pix_format *pix = &f->fmt.pix;
608 struct v4l2_mbus_framefmt mf;
609 int ret;
610 /* TODO: limit to mx1 hardware capabilities */
611
612 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
613 if (!xlate) {
614 dev_warn(icd->parent, "Format %x not found\n",
615 pix->pixelformat);
616 return -EINVAL;
617 }
618
619 mf.width = pix->width;
620 mf.height = pix->height;
621 mf.field = pix->field;
622 mf.colorspace = pix->colorspace;
623 mf.code = xlate->code;
624
625 /* limit to sensor capabilities */
626 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
627 if (ret < 0)
628 return ret;
629
630 pix->width = mf.width;
631 pix->height = mf.height;
632 pix->field = mf.field;
633 pix->colorspace = mf.colorspace;
634
635 return 0;
636 }
637
638 static int mx1_camera_reqbufs(struct soc_camera_device *icd,
639 struct v4l2_requestbuffers *p)
640 {
641 int i;
642
643 /*
644 * This is for locking debugging only. I removed spinlocks and now I
645 * check whether .prepare is ever called on a linked buffer, or whether
646 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
647 * it hadn't triggered
648 */
649 for (i = 0; i < p->count; i++) {
650 struct mx1_buffer *buf = container_of(icd->vb_vidq.bufs[i],
651 struct mx1_buffer, vb);
652 buf->inwork = 0;
653 INIT_LIST_HEAD(&buf->vb.queue);
654 }
655
656 return 0;
657 }
658
659 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
660 {
661 struct soc_camera_device *icd = file->private_data;
662 struct mx1_buffer *buf;
663
664 buf = list_entry(icd->vb_vidq.stream.next, struct mx1_buffer,
665 vb.stream);
666
667 poll_wait(file, &buf->vb.done, pt);
668
669 if (buf->vb.state == VIDEOBUF_DONE ||
670 buf->vb.state == VIDEOBUF_ERROR)
671 return POLLIN | POLLRDNORM;
672
673 return 0;
674 }
675
676 static int mx1_camera_querycap(struct soc_camera_host *ici,
677 struct v4l2_capability *cap)
678 {
679 /* cap->name is set by the friendly caller:-> */
680 strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
681 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
682
683 return 0;
684 }
685
686 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
687 .owner = THIS_MODULE,
688 .add = mx1_camera_add_device,
689 .remove = mx1_camera_remove_device,
690 .set_bus_param = mx1_camera_set_bus_param,
691 .set_crop = mx1_camera_set_crop,
692 .set_fmt = mx1_camera_set_fmt,
693 .try_fmt = mx1_camera_try_fmt,
694 .init_videobuf = mx1_camera_init_videobuf,
695 .reqbufs = mx1_camera_reqbufs,
696 .poll = mx1_camera_poll,
697 .querycap = mx1_camera_querycap,
698 };
699
700 static struct fiq_handler fh = {
701 .name = "csi_sof"
702 };
703
704 static int __init mx1_camera_probe(struct platform_device *pdev)
705 {
706 struct mx1_camera_dev *pcdev;
707 struct resource *res;
708 struct pt_regs regs;
709 struct clk *clk;
710 void __iomem *base;
711 unsigned int irq;
712 int err = 0;
713
714 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
715 irq = platform_get_irq(pdev, 0);
716 if (!res || (int)irq <= 0) {
717 err = -ENODEV;
718 goto exit;
719 }
720
721 clk = clk_get(&pdev->dev, "csi_clk");
722 if (IS_ERR(clk)) {
723 err = PTR_ERR(clk);
724 goto exit;
725 }
726
727 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
728 if (!pcdev) {
729 dev_err(&pdev->dev, "Could not allocate pcdev\n");
730 err = -ENOMEM;
731 goto exit_put_clk;
732 }
733
734 pcdev->res = res;
735 pcdev->clk = clk;
736
737 pcdev->pdata = pdev->dev.platform_data;
738
739 if (pcdev->pdata)
740 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
741
742 if (!pcdev->mclk) {
743 dev_warn(&pdev->dev,
744 "mclk_10khz == 0! Please, fix your platform data. "
745 "Using default 20MHz\n");
746 pcdev->mclk = 20000000;
747 }
748
749 INIT_LIST_HEAD(&pcdev->capture);
750 spin_lock_init(&pcdev->lock);
751
752 /*
753 * Request the regions.
754 */
755 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
756 err = -EBUSY;
757 goto exit_kfree;
758 }
759
760 base = ioremap(res->start, resource_size(res));
761 if (!base) {
762 err = -ENOMEM;
763 goto exit_release;
764 }
765 pcdev->irq = irq;
766 pcdev->base = base;
767
768 /* request dma */
769 pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
770 if (pcdev->dma_chan < 0) {
771 dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
772 err = -EBUSY;
773 goto exit_iounmap;
774 }
775 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
776
777 imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
778 pcdev);
779
780 imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
781 IMX_DMA_MEMSIZE_32, MX1_DMA_REQ_CSI_R, 0);
782 /* burst length : 16 words = 64 bytes */
783 imx_dma_config_burstlen(pcdev->dma_chan, 0);
784
785 /* request irq */
786 err = claim_fiq(&fh);
787 if (err) {
788 dev_err(&pdev->dev, "Camera interrupt register failed \n");
789 goto exit_free_dma;
790 }
791
792 set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
793 &mx1_camera_sof_fiq_start);
794
795 regs.ARM_r8 = (long)MX1_DMA_DIMR;
796 regs.ARM_r9 = (long)MX1_DMA_CCR(pcdev->dma_chan);
797 regs.ARM_r10 = (long)pcdev->base + CSICR1;
798 regs.ARM_fp = (long)pcdev->base + CSISR;
799 regs.ARM_sp = 1 << pcdev->dma_chan;
800 set_fiq_regs(&regs);
801
802 mxc_set_irq_fiq(irq, 1);
803 enable_fiq(irq);
804
805 pcdev->soc_host.drv_name = DRIVER_NAME;
806 pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
807 pcdev->soc_host.priv = pcdev;
808 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
809 pcdev->soc_host.nr = pdev->id;
810 err = soc_camera_host_register(&pcdev->soc_host);
811 if (err)
812 goto exit_free_irq;
813
814 dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
815
816 return 0;
817
818 exit_free_irq:
819 disable_fiq(irq);
820 mxc_set_irq_fiq(irq, 0);
821 release_fiq(&fh);
822 exit_free_dma:
823 imx_dma_free(pcdev->dma_chan);
824 exit_iounmap:
825 iounmap(base);
826 exit_release:
827 release_mem_region(res->start, resource_size(res));
828 exit_kfree:
829 kfree(pcdev);
830 exit_put_clk:
831 clk_put(clk);
832 exit:
833 return err;
834 }
835
836 static int __exit mx1_camera_remove(struct platform_device *pdev)
837 {
838 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
839 struct mx1_camera_dev *pcdev = container_of(soc_host,
840 struct mx1_camera_dev, soc_host);
841 struct resource *res;
842
843 imx_dma_free(pcdev->dma_chan);
844 disable_fiq(pcdev->irq);
845 mxc_set_irq_fiq(pcdev->irq, 0);
846 release_fiq(&fh);
847
848 clk_put(pcdev->clk);
849
850 soc_camera_host_unregister(soc_host);
851
852 iounmap(pcdev->base);
853
854 res = pcdev->res;
855 release_mem_region(res->start, resource_size(res));
856
857 kfree(pcdev);
858
859 dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
860
861 return 0;
862 }
863
864 static struct platform_driver mx1_camera_driver = {
865 .driver = {
866 .name = DRIVER_NAME,
867 },
868 .remove = __exit_p(mx1_camera_remove),
869 };
870
871 static int __init mx1_camera_init(void)
872 {
873 return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
874 }
875
876 static void __exit mx1_camera_exit(void)
877 {
878 return platform_driver_unregister(&mx1_camera_driver);
879 }
880
881 module_init(mx1_camera_init);
882 module_exit(mx1_camera_exit);
883
884 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
885 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
886 MODULE_LICENSE("GPL v2");
887 MODULE_VERSION(DRIVER_VERSION);
888 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux kernel - Deliverables
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