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[media] mt9v011: Fixed incorrect value for the first valid column
[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/version.h>
35 #include <linux/videodev2.h>
36
37 #include <media/soc_camera.h>
38 #include <media/v4l2-common.h>
39 #include <media/v4l2-dev.h>
40 #include <media/videobuf-dma-contig.h>
41 #include <media/soc_mediabus.h>
42
43 #include <asm/dma.h>
44 #include <asm/fiq.h>
45 #include <mach/dma-mx1-mx2.h>
46 #include <mach/hardware.h>
47 #include <mach/mx1_camera.h>
48
49 /*
50 * CSI registers
51 */
52 #define CSICR1 0x00 /* CSI Control Register 1 */
53 #define CSISR 0x08 /* CSI Status Register */
54 #define CSIRXR 0x10 /* CSI RxFIFO Register */
55
56 #define CSICR1_RXFF_LEVEL(x) (((x) & 0x3) << 19)
57 #define CSICR1_SOF_POL (1 << 17)
58 #define CSICR1_SOF_INTEN (1 << 16)
59 #define CSICR1_MCLKDIV(x) (((x) & 0xf) << 12)
60 #define CSICR1_MCLKEN (1 << 9)
61 #define CSICR1_FCC (1 << 8)
62 #define CSICR1_BIG_ENDIAN (1 << 7)
63 #define CSICR1_CLR_RXFIFO (1 << 5)
64 #define CSICR1_GCLK_MODE (1 << 4)
65 #define CSICR1_DATA_POL (1 << 2)
66 #define CSICR1_REDGE (1 << 1)
67 #define CSICR1_EN (1 << 0)
68
69 #define CSISR_SFF_OR_INT (1 << 25)
70 #define CSISR_RFF_OR_INT (1 << 24)
71 #define CSISR_STATFF_INT (1 << 21)
72 #define CSISR_RXFF_INT (1 << 18)
73 #define CSISR_SOF_INT (1 << 16)
74 #define CSISR_DRDY (1 << 0)
75
76 #define VERSION_CODE KERNEL_VERSION(0, 0, 1)
77 #define DRIVER_NAME "mx1-camera"
78
79 #define CSI_IRQ_MASK (CSISR_SFF_OR_INT | CSISR_RFF_OR_INT | \
80 CSISR_STATFF_INT | CSISR_RXFF_INT | CSISR_SOF_INT)
81
82 #define CSI_BUS_FLAGS (SOCAM_MASTER | SOCAM_HSYNC_ACTIVE_HIGH | \
83 SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW | \
84 SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \
85 SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATA_ACTIVE_LOW | \
86 SOCAM_DATAWIDTH_8)
87
88 #define MAX_VIDEO_MEM 16 /* Video memory limit in megabytes */
89
90 /*
91 * Structures
92 */
93
94 /* buffer for one video frame */
95 struct mx1_buffer {
96 /* common v4l buffer stuff -- must be first */
97 struct videobuf_buffer vb;
98 enum v4l2_mbus_pixelcode code;
99 int inwork;
100 };
101
102 /*
103 * i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
104 * Interface. If anyone ever builds hardware to enable more than
105 * one camera, they will have to modify this driver too
106 */
107 struct mx1_camera_dev {
108 struct soc_camera_host soc_host;
109 struct soc_camera_device *icd;
110 struct mx1_camera_pdata *pdata;
111 struct mx1_buffer *active;
112 struct resource *res;
113 struct clk *clk;
114 struct list_head capture;
115
116 void __iomem *base;
117 int dma_chan;
118 unsigned int irq;
119 unsigned long mclk;
120
121 spinlock_t lock;
122 };
123
124 /*
125 * Videobuf operations
126 */
127 static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
128 unsigned int *size)
129 {
130 struct soc_camera_device *icd = vq->priv_data;
131 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
132 icd->current_fmt->host_fmt);
133
134 if (bytes_per_line < 0)
135 return bytes_per_line;
136
137 *size = bytes_per_line * icd->user_height;
138
139 if (!*count)
140 *count = 32;
141
142 if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
143 *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
144
145 dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
146
147 return 0;
148 }
149
150 static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
151 {
152 struct soc_camera_device *icd = vq->priv_data;
153 struct videobuf_buffer *vb = &buf->vb;
154
155 BUG_ON(in_interrupt());
156
157 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
158 vb, vb->baddr, vb->bsize);
159
160 /*
161 * This waits until this buffer is out of danger, i.e., until it is no
162 * longer in STATE_QUEUED or STATE_ACTIVE
163 */
164 videobuf_waiton(vq, vb, 0, 0);
165 videobuf_dma_contig_free(vq, vb);
166
167 vb->state = VIDEOBUF_NEEDS_INIT;
168 }
169
170 static int mx1_videobuf_prepare(struct videobuf_queue *vq,
171 struct videobuf_buffer *vb, enum v4l2_field field)
172 {
173 struct soc_camera_device *icd = vq->priv_data;
174 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
175 int ret;
176 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
177 icd->current_fmt->host_fmt);
178
179 if (bytes_per_line < 0)
180 return bytes_per_line;
181
182 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
183 vb, vb->baddr, vb->bsize);
184
185 /* Added list head initialization on alloc */
186 WARN_ON(!list_empty(&vb->queue));
187
188 BUG_ON(NULL == icd->current_fmt);
189
190 /*
191 * I think, in buf_prepare you only have to protect global data,
192 * the actual buffer is yours
193 */
194 buf->inwork = 1;
195
196 if (buf->code != icd->current_fmt->code ||
197 vb->width != icd->user_width ||
198 vb->height != icd->user_height ||
199 vb->field != field) {
200 buf->code = icd->current_fmt->code;
201 vb->width = icd->user_width;
202 vb->height = icd->user_height;
203 vb->field = field;
204 vb->state = VIDEOBUF_NEEDS_INIT;
205 }
206
207 vb->size = bytes_per_line * vb->height;
208 if (0 != vb->baddr && vb->bsize < vb->size) {
209 ret = -EINVAL;
210 goto out;
211 }
212
213 if (vb->state == VIDEOBUF_NEEDS_INIT) {
214 ret = videobuf_iolock(vq, vb, NULL);
215 if (ret)
216 goto fail;
217
218 vb->state = VIDEOBUF_PREPARED;
219 }
220
221 buf->inwork = 0;
222
223 return 0;
224
225 fail:
226 free_buffer(vq, buf);
227 out:
228 buf->inwork = 0;
229 return ret;
230 }
231
232 static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
233 {
234 struct videobuf_buffer *vbuf = &pcdev->active->vb;
235 struct device *dev = pcdev->icd->dev.parent;
236 int ret;
237
238 if (unlikely(!pcdev->active)) {
239 dev_err(dev, "DMA End IRQ with no active buffer\n");
240 return -EFAULT;
241 }
242
243 /* setup sg list for future DMA */
244 ret = imx_dma_setup_single(pcdev->dma_chan,
245 videobuf_to_dma_contig(vbuf),
246 vbuf->size, pcdev->res->start +
247 CSIRXR, DMA_MODE_READ);
248 if (unlikely(ret))
249 dev_err(dev, "Failed to setup DMA sg list\n");
250
251 return ret;
252 }
253
254 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
255 static void mx1_videobuf_queue(struct videobuf_queue *vq,
256 struct videobuf_buffer *vb)
257 {
258 struct soc_camera_device *icd = vq->priv_data;
259 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
260 struct mx1_camera_dev *pcdev = ici->priv;
261 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
262
263 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
264 vb, vb->baddr, vb->bsize);
265
266 list_add_tail(&vb->queue, &pcdev->capture);
267
268 vb->state = VIDEOBUF_ACTIVE;
269
270 if (!pcdev->active) {
271 pcdev->active = buf;
272
273 /* setup sg list for future DMA */
274 if (!mx1_camera_setup_dma(pcdev)) {
275 unsigned int temp;
276 /* enable SOF irq */
277 temp = __raw_readl(pcdev->base + CSICR1) |
278 CSICR1_SOF_INTEN;
279 __raw_writel(temp, pcdev->base + CSICR1);
280 }
281 }
282 }
283
284 static void mx1_videobuf_release(struct videobuf_queue *vq,
285 struct videobuf_buffer *vb)
286 {
287 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
288 #ifdef DEBUG
289 struct soc_camera_device *icd = vq->priv_data;
290 struct device *dev = icd->dev.parent;
291
292 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
293 vb, vb->baddr, vb->bsize);
294
295 switch (vb->state) {
296 case VIDEOBUF_ACTIVE:
297 dev_dbg(dev, "%s (active)\n", __func__);
298 break;
299 case VIDEOBUF_QUEUED:
300 dev_dbg(dev, "%s (queued)\n", __func__);
301 break;
302 case VIDEOBUF_PREPARED:
303 dev_dbg(dev, "%s (prepared)\n", __func__);
304 break;
305 default:
306 dev_dbg(dev, "%s (unknown)\n", __func__);
307 break;
308 }
309 #endif
310
311 free_buffer(vq, buf);
312 }
313
314 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
315 struct videobuf_buffer *vb,
316 struct mx1_buffer *buf)
317 {
318 /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
319 list_del_init(&vb->queue);
320 vb->state = VIDEOBUF_DONE;
321 do_gettimeofday(&vb->ts);
322 vb->field_count++;
323 wake_up(&vb->done);
324
325 if (list_empty(&pcdev->capture)) {
326 pcdev->active = NULL;
327 return;
328 }
329
330 pcdev->active = list_entry(pcdev->capture.next,
331 struct mx1_buffer, vb.queue);
332
333 /* setup sg list for future DMA */
334 if (likely(!mx1_camera_setup_dma(pcdev))) {
335 unsigned int temp;
336
337 /* enable SOF irq */
338 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
339 __raw_writel(temp, pcdev->base + CSICR1);
340 }
341 }
342
343 static void mx1_camera_dma_irq(int channel, void *data)
344 {
345 struct mx1_camera_dev *pcdev = data;
346 struct device *dev = pcdev->icd->dev.parent;
347 struct mx1_buffer *buf;
348 struct videobuf_buffer *vb;
349 unsigned long flags;
350
351 spin_lock_irqsave(&pcdev->lock, flags);
352
353 imx_dma_disable(channel);
354
355 if (unlikely(!pcdev->active)) {
356 dev_err(dev, "DMA End IRQ with no active buffer\n");
357 goto out;
358 }
359
360 vb = &pcdev->active->vb;
361 buf = container_of(vb, struct mx1_buffer, vb);
362 WARN_ON(buf->inwork || list_empty(&vb->queue));
363 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
364 vb, vb->baddr, vb->bsize);
365
366 mx1_camera_wakeup(pcdev, vb, buf);
367 out:
368 spin_unlock_irqrestore(&pcdev->lock, flags);
369 }
370
371 static struct videobuf_queue_ops mx1_videobuf_ops = {
372 .buf_setup = mx1_videobuf_setup,
373 .buf_prepare = mx1_videobuf_prepare,
374 .buf_queue = mx1_videobuf_queue,
375 .buf_release = mx1_videobuf_release,
376 };
377
378 static void mx1_camera_init_videobuf(struct videobuf_queue *q,
379 struct soc_camera_device *icd)
380 {
381 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
382 struct mx1_camera_dev *pcdev = ici->priv;
383
384 videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, icd->dev.parent,
385 &pcdev->lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
386 V4L2_FIELD_NONE,
387 sizeof(struct mx1_buffer), icd, &icd->video_lock);
388 }
389
390 static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
391 {
392 unsigned int mclk = pcdev->mclk;
393 unsigned long div;
394 unsigned long lcdclk;
395
396 lcdclk = clk_get_rate(pcdev->clk);
397
398 /*
399 * We verify platform_mclk_10khz != 0, so if anyone breaks it, here
400 * they get a nice Oops
401 */
402 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
403
404 dev_dbg(pcdev->icd->dev.parent,
405 "System clock %lukHz, target freq %dkHz, divisor %lu\n",
406 lcdclk / 1000, mclk / 1000, div);
407
408 return div;
409 }
410
411 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
412 {
413 unsigned int csicr1 = CSICR1_EN;
414
415 dev_dbg(pcdev->icd->dev.parent, "Activate device\n");
416
417 clk_enable(pcdev->clk);
418
419 /* enable CSI before doing anything else */
420 __raw_writel(csicr1, pcdev->base + CSICR1);
421
422 csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
423 csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
424 csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
425
426 __raw_writel(csicr1, pcdev->base + CSICR1);
427 }
428
429 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
430 {
431 dev_dbg(pcdev->icd->dev.parent, "Deactivate device\n");
432
433 /* Disable all CSI interface */
434 __raw_writel(0x00, pcdev->base + CSICR1);
435
436 clk_disable(pcdev->clk);
437 }
438
439 /*
440 * The following two functions absolutely depend on the fact, that
441 * there can be only one camera on i.MX1/i.MXL camera sensor interface
442 */
443 static int mx1_camera_add_device(struct soc_camera_device *icd)
444 {
445 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
446 struct mx1_camera_dev *pcdev = ici->priv;
447
448 if (pcdev->icd)
449 return -EBUSY;
450
451 dev_info(icd->dev.parent, "MX1 Camera driver attached to camera %d\n",
452 icd->devnum);
453
454 mx1_camera_activate(pcdev);
455
456 pcdev->icd = icd;
457
458 return 0;
459 }
460
461 static void mx1_camera_remove_device(struct soc_camera_device *icd)
462 {
463 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
464 struct mx1_camera_dev *pcdev = ici->priv;
465 unsigned int csicr1;
466
467 BUG_ON(icd != pcdev->icd);
468
469 /* disable interrupts */
470 csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
471 __raw_writel(csicr1, pcdev->base + CSICR1);
472
473 /* Stop DMA engine */
474 imx_dma_disable(pcdev->dma_chan);
475
476 dev_info(icd->dev.parent, "MX1 Camera driver detached from camera %d\n",
477 icd->devnum);
478
479 mx1_camera_deactivate(pcdev);
480
481 pcdev->icd = NULL;
482 }
483
484 static int mx1_camera_set_crop(struct soc_camera_device *icd,
485 struct v4l2_crop *a)
486 {
487 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
488
489 return v4l2_subdev_call(sd, video, s_crop, a);
490 }
491
492 static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
493 {
494 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
495 struct mx1_camera_dev *pcdev = ici->priv;
496 unsigned long camera_flags, common_flags;
497 unsigned int csicr1;
498 int ret;
499
500 camera_flags = icd->ops->query_bus_param(icd);
501
502 /* MX1 supports only 8bit buswidth */
503 common_flags = soc_camera_bus_param_compatible(camera_flags,
504 CSI_BUS_FLAGS);
505 if (!common_flags)
506 return -EINVAL;
507
508 /* Make choises, based on platform choice */
509 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
510 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
511 if (!pcdev->pdata ||
512 pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
513 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
514 else
515 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
516 }
517
518 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
519 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
520 if (!pcdev->pdata ||
521 pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
522 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
523 else
524 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
525 }
526
527 if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
528 (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
529 if (!pcdev->pdata ||
530 pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
531 common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
532 else
533 common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
534 }
535
536 ret = icd->ops->set_bus_param(icd, common_flags);
537 if (ret < 0)
538 return ret;
539
540 csicr1 = __raw_readl(pcdev->base + CSICR1);
541
542 if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
543 csicr1 |= CSICR1_REDGE;
544 if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
545 csicr1 |= CSICR1_SOF_POL;
546 if (common_flags & SOCAM_DATA_ACTIVE_LOW)
547 csicr1 |= CSICR1_DATA_POL;
548
549 __raw_writel(csicr1, pcdev->base + CSICR1);
550
551 return 0;
552 }
553
554 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
555 struct v4l2_format *f)
556 {
557 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
558 const struct soc_camera_format_xlate *xlate;
559 struct v4l2_pix_format *pix = &f->fmt.pix;
560 struct v4l2_mbus_framefmt mf;
561 int ret, buswidth;
562
563 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
564 if (!xlate) {
565 dev_warn(icd->dev.parent, "Format %x not found\n",
566 pix->pixelformat);
567 return -EINVAL;
568 }
569
570 buswidth = xlate->host_fmt->bits_per_sample;
571 if (buswidth > 8) {
572 dev_warn(icd->dev.parent,
573 "bits-per-sample %d for format %x unsupported\n",
574 buswidth, pix->pixelformat);
575 return -EINVAL;
576 }
577
578 mf.width = pix->width;
579 mf.height = pix->height;
580 mf.field = pix->field;
581 mf.colorspace = pix->colorspace;
582 mf.code = xlate->code;
583
584 ret = v4l2_subdev_call(sd, video, s_mbus_fmt, &mf);
585 if (ret < 0)
586 return ret;
587
588 if (mf.code != xlate->code)
589 return -EINVAL;
590
591 pix->width = mf.width;
592 pix->height = mf.height;
593 pix->field = mf.field;
594 pix->colorspace = mf.colorspace;
595 icd->current_fmt = xlate;
596
597 return ret;
598 }
599
600 static int mx1_camera_try_fmt(struct soc_camera_device *icd,
601 struct v4l2_format *f)
602 {
603 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
604 const struct soc_camera_format_xlate *xlate;
605 struct v4l2_pix_format *pix = &f->fmt.pix;
606 struct v4l2_mbus_framefmt mf;
607 int ret;
608 /* TODO: limit to mx1 hardware capabilities */
609
610 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
611 if (!xlate) {
612 dev_warn(icd->dev.parent, "Format %x not found\n",
613 pix->pixelformat);
614 return -EINVAL;
615 }
616
617 mf.width = pix->width;
618 mf.height = pix->height;
619 mf.field = pix->field;
620 mf.colorspace = pix->colorspace;
621 mf.code = xlate->code;
622
623 /* limit to sensor capabilities */
624 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
625 if (ret < 0)
626 return ret;
627
628 pix->width = mf.width;
629 pix->height = mf.height;
630 pix->field = mf.field;
631 pix->colorspace = mf.colorspace;
632
633 return 0;
634 }
635
636 static int mx1_camera_reqbufs(struct soc_camera_device *icd,
637 struct v4l2_requestbuffers *p)
638 {
639 int i;
640
641 /*
642 * This is for locking debugging only. I removed spinlocks and now I
643 * check whether .prepare is ever called on a linked buffer, or whether
644 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
645 * it hadn't triggered
646 */
647 for (i = 0; i < p->count; i++) {
648 struct mx1_buffer *buf = container_of(icd->vb_vidq.bufs[i],
649 struct mx1_buffer, vb);
650 buf->inwork = 0;
651 INIT_LIST_HEAD(&buf->vb.queue);
652 }
653
654 return 0;
655 }
656
657 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
658 {
659 struct soc_camera_device *icd = file->private_data;
660 struct mx1_buffer *buf;
661
662 buf = list_entry(icd->vb_vidq.stream.next, struct mx1_buffer,
663 vb.stream);
664
665 poll_wait(file, &buf->vb.done, pt);
666
667 if (buf->vb.state == VIDEOBUF_DONE ||
668 buf->vb.state == VIDEOBUF_ERROR)
669 return POLLIN | POLLRDNORM;
670
671 return 0;
672 }
673
674 static int mx1_camera_querycap(struct soc_camera_host *ici,
675 struct v4l2_capability *cap)
676 {
677 /* cap->name is set by the friendly caller:-> */
678 strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
679 cap->version = VERSION_CODE;
680 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
681
682 return 0;
683 }
684
685 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
686 .owner = THIS_MODULE,
687 .add = mx1_camera_add_device,
688 .remove = mx1_camera_remove_device,
689 .set_bus_param = mx1_camera_set_bus_param,
690 .set_crop = mx1_camera_set_crop,
691 .set_fmt = mx1_camera_set_fmt,
692 .try_fmt = mx1_camera_try_fmt,
693 .init_videobuf = mx1_camera_init_videobuf,
694 .reqbufs = mx1_camera_reqbufs,
695 .poll = mx1_camera_poll,
696 .querycap = mx1_camera_querycap,
697 };
698
699 static struct fiq_handler fh = {
700 .name = "csi_sof"
701 };
702
703 static int __init mx1_camera_probe(struct platform_device *pdev)
704 {
705 struct mx1_camera_dev *pcdev;
706 struct resource *res;
707 struct pt_regs regs;
708 struct clk *clk;
709 void __iomem *base;
710 unsigned int irq;
711 int err = 0;
712
713 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
714 irq = platform_get_irq(pdev, 0);
715 if (!res || (int)irq <= 0) {
716 err = -ENODEV;
717 goto exit;
718 }
719
720 clk = clk_get(&pdev->dev, "csi_clk");
721 if (IS_ERR(clk)) {
722 err = PTR_ERR(clk);
723 goto exit;
724 }
725
726 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
727 if (!pcdev) {
728 dev_err(&pdev->dev, "Could not allocate pcdev\n");
729 err = -ENOMEM;
730 goto exit_put_clk;
731 }
732
733 pcdev->res = res;
734 pcdev->clk = clk;
735
736 pcdev->pdata = pdev->dev.platform_data;
737
738 if (pcdev->pdata)
739 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
740
741 if (!pcdev->mclk) {
742 dev_warn(&pdev->dev,
743 "mclk_10khz == 0! Please, fix your platform data. "
744 "Using default 20MHz\n");
745 pcdev->mclk = 20000000;
746 }
747
748 INIT_LIST_HEAD(&pcdev->capture);
749 spin_lock_init(&pcdev->lock);
750
751 /*
752 * Request the regions.
753 */
754 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
755 err = -EBUSY;
756 goto exit_kfree;
757 }
758
759 base = ioremap(res->start, resource_size(res));
760 if (!base) {
761 err = -ENOMEM;
762 goto exit_release;
763 }
764 pcdev->irq = irq;
765 pcdev->base = base;
766
767 /* request dma */
768 pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
769 if (pcdev->dma_chan < 0) {
770 dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
771 err = -EBUSY;
772 goto exit_iounmap;
773 }
774 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
775
776 imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
777 pcdev);
778
779 imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
780 IMX_DMA_MEMSIZE_32, MX1_DMA_REQ_CSI_R, 0);
781 /* burst length : 16 words = 64 bytes */
782 imx_dma_config_burstlen(pcdev->dma_chan, 0);
783
784 /* request irq */
785 err = claim_fiq(&fh);
786 if (err) {
787 dev_err(&pdev->dev, "Camera interrupt register failed \n");
788 goto exit_free_dma;
789 }
790
791 set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
792 &mx1_camera_sof_fiq_start);
793
794 regs.ARM_r8 = (long)MX1_DMA_DIMR;
795 regs.ARM_r9 = (long)MX1_DMA_CCR(pcdev->dma_chan);
796 regs.ARM_r10 = (long)pcdev->base + CSICR1;
797 regs.ARM_fp = (long)pcdev->base + CSISR;
798 regs.ARM_sp = 1 << pcdev->dma_chan;
799 set_fiq_regs(&regs);
800
801 mxc_set_irq_fiq(irq, 1);
802 enable_fiq(irq);
803
804 pcdev->soc_host.drv_name = DRIVER_NAME;
805 pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
806 pcdev->soc_host.priv = pcdev;
807 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
808 pcdev->soc_host.nr = pdev->id;
809 err = soc_camera_host_register(&pcdev->soc_host);
810 if (err)
811 goto exit_free_irq;
812
813 dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
814
815 return 0;
816
817 exit_free_irq:
818 disable_fiq(irq);
819 mxc_set_irq_fiq(irq, 0);
820 release_fiq(&fh);
821 exit_free_dma:
822 imx_dma_free(pcdev->dma_chan);
823 exit_iounmap:
824 iounmap(base);
825 exit_release:
826 release_mem_region(res->start, resource_size(res));
827 exit_kfree:
828 kfree(pcdev);
829 exit_put_clk:
830 clk_put(clk);
831 exit:
832 return err;
833 }
834
835 static int __exit mx1_camera_remove(struct platform_device *pdev)
836 {
837 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
838 struct mx1_camera_dev *pcdev = container_of(soc_host,
839 struct mx1_camera_dev, soc_host);
840 struct resource *res;
841
842 imx_dma_free(pcdev->dma_chan);
843 disable_fiq(pcdev->irq);
844 mxc_set_irq_fiq(pcdev->irq, 0);
845 release_fiq(&fh);
846
847 clk_put(pcdev->clk);
848
849 soc_camera_host_unregister(soc_host);
850
851 iounmap(pcdev->base);
852
853 res = pcdev->res;
854 release_mem_region(res->start, resource_size(res));
855
856 kfree(pcdev);
857
858 dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
859
860 return 0;
861 }
862
863 static struct platform_driver mx1_camera_driver = {
864 .driver = {
865 .name = DRIVER_NAME,
866 },
867 .remove = __exit_p(mx1_camera_remove),
868 };
869
870 static int __init mx1_camera_init(void)
871 {
872 return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
873 }
874
875 static void __exit mx1_camera_exit(void)
876 {
877 return platform_driver_unregister(&mx1_camera_driver);
878 }
879
880 module_init(mx1_camera_init);
881 module_exit(mx1_camera_exit);
882
883 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
884 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
885 MODULE_LICENSE("GPL v2");
886 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux kernel - Deliverables
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