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[linux/fpc-iii.git] / drivers / media / video / mx1_camera.c
blob736c31d23194525b233966c848ab7cae772c8dc9
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/time.h>
32 #include <linux/version.h>
33 #include <linux/videodev2.h>
34
35 #include <media/soc_camera.h>
36 #include <media/v4l2-common.h>
37 #include <media/v4l2-dev.h>
38 #include <media/videobuf-dma-contig.h>
39
40 #include <asm/dma.h>
41 #include <asm/fiq.h>
42 #include <mach/dma-mx1-mx2.h>
43 #include <mach/hardware.h>
44 #include <mach/mx1_camera.h>
45
46 /*
47 * CSI registers
48 */
49 #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
50 #define DMA_DIMR 0x08 /* Interrupt mask Register */
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 VERSION_CODE KERNEL_VERSION(0, 0, 1)
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 const struct soc_camera_data_format *fmt;
98 int inwork;
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 struct mx1_camera_dev {
105 struct soc_camera_host soc_host;
106 struct soc_camera_device *icd;
107 struct mx1_camera_pdata *pdata;
108 struct mx1_buffer *active;
109 struct resource *res;
110 struct clk *clk;
111 struct list_head capture;
112
113 void __iomem *base;
114 int dma_chan;
115 unsigned int irq;
116 unsigned long mclk;
117
118 spinlock_t lock;
119 };
120
121 /*
122 * Videobuf operations
123 */
124 static int mx1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
125 unsigned int *size)
126 {
127 struct soc_camera_device *icd = vq->priv_data;
128
129 *size = icd->width * icd->height *
130 ((icd->current_fmt->depth + 7) >> 3);
131
132 if (!*count)
133 *count = 32;
134
135 while (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
136 (*count)--;
137
138 dev_dbg(&icd->dev, "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->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
151 vb, vb->baddr, vb->bsize);
152
153 /* This waits until this buffer is out of danger, i.e., until it is no
154 * longer in STATE_QUEUED or STATE_ACTIVE */
155 videobuf_waiton(vb, 0, 0);
156 videobuf_dma_contig_free(vq, vb);
157
158 vb->state = VIDEOBUF_NEEDS_INIT;
159 }
160
161 static int mx1_videobuf_prepare(struct videobuf_queue *vq,
162 struct videobuf_buffer *vb, enum v4l2_field field)
163 {
164 struct soc_camera_device *icd = vq->priv_data;
165 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
166 int ret;
167
168 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
169 vb, vb->baddr, vb->bsize);
170
171 /* Added list head initialization on alloc */
172 WARN_ON(!list_empty(&vb->queue));
173
174 BUG_ON(NULL == icd->current_fmt);
175
176 /* I think, in buf_prepare you only have to protect global data,
177 * the actual buffer is yours */
178 buf->inwork = 1;
179
180 if (buf->fmt != icd->current_fmt ||
181 vb->width != icd->width ||
182 vb->height != icd->height ||
183 vb->field != field) {
184 buf->fmt = icd->current_fmt;
185 vb->width = icd->width;
186 vb->height = icd->height;
187 vb->field = field;
188 vb->state = VIDEOBUF_NEEDS_INIT;
189 }
190
191 vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
192 if (0 != vb->baddr && vb->bsize < vb->size) {
193 ret = -EINVAL;
194 goto out;
195 }
196
197 if (vb->state == VIDEOBUF_NEEDS_INIT) {
198 ret = videobuf_iolock(vq, vb, NULL);
199 if (ret)
200 goto fail;
201
202 vb->state = VIDEOBUF_PREPARED;
203 }
204
205 buf->inwork = 0;
206
207 return 0;
208
209 fail:
210 free_buffer(vq, buf);
211 out:
212 buf->inwork = 0;
213 return ret;
214 }
215
216 static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
217 {
218 struct videobuf_buffer *vbuf = &pcdev->active->vb;
219 int ret;
220
221 if (unlikely(!pcdev->active)) {
222 dev_err(pcdev->soc_host.dev, "DMA End IRQ with no active buffer\n");
223 return -EFAULT;
224 }
225
226 /* setup sg list for future DMA */
227 ret = imx_dma_setup_single(pcdev->dma_chan,
228 videobuf_to_dma_contig(vbuf),
229 vbuf->size, pcdev->res->start +
230 CSIRXR, DMA_MODE_READ);
231 if (unlikely(ret))
232 dev_err(pcdev->soc_host.dev, "Failed to setup DMA sg list\n");
233
234 return ret;
235 }
236
237 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
238 static void mx1_videobuf_queue(struct videobuf_queue *vq,
239 struct videobuf_buffer *vb)
240 {
241 struct soc_camera_device *icd = vq->priv_data;
242 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
243 struct mx1_camera_dev *pcdev = ici->priv;
244 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
245
246 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
247 vb, vb->baddr, vb->bsize);
248
249 list_add_tail(&vb->queue, &pcdev->capture);
250
251 vb->state = VIDEOBUF_ACTIVE;
252
253 if (!pcdev->active) {
254 pcdev->active = buf;
255
256 /* setup sg list for future DMA */
257 if (!mx1_camera_setup_dma(pcdev)) {
258 unsigned int temp;
259 /* enable SOF irq */
260 temp = __raw_readl(pcdev->base + CSICR1) |
261 CSICR1_SOF_INTEN;
262 __raw_writel(temp, pcdev->base + CSICR1);
263 }
264 }
265 }
266
267 static void mx1_videobuf_release(struct videobuf_queue *vq,
268 struct videobuf_buffer *vb)
269 {
270 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
271 #ifdef DEBUG
272 struct soc_camera_device *icd = vq->priv_data;
273
274 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
275 vb, vb->baddr, vb->bsize);
276
277 switch (vb->state) {
278 case VIDEOBUF_ACTIVE:
279 dev_dbg(&icd->dev, "%s (active)\n", __func__);
280 break;
281 case VIDEOBUF_QUEUED:
282 dev_dbg(&icd->dev, "%s (queued)\n", __func__);
283 break;
284 case VIDEOBUF_PREPARED:
285 dev_dbg(&icd->dev, "%s (prepared)\n", __func__);
286 break;
287 default:
288 dev_dbg(&icd->dev, "%s (unknown)\n", __func__);
289 break;
290 }
291 #endif
292
293 free_buffer(vq, buf);
294 }
295
296 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
297 struct videobuf_buffer *vb,
298 struct mx1_buffer *buf)
299 {
300 /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
301 list_del_init(&vb->queue);
302 vb->state = VIDEOBUF_DONE;
303 do_gettimeofday(&vb->ts);
304 vb->field_count++;
305 wake_up(&vb->done);
306
307 if (list_empty(&pcdev->capture)) {
308 pcdev->active = NULL;
309 return;
310 }
311
312 pcdev->active = list_entry(pcdev->capture.next,
313 struct mx1_buffer, vb.queue);
314
315 /* setup sg list for future DMA */
316 if (likely(!mx1_camera_setup_dma(pcdev))) {
317 unsigned int temp;
318
319 /* enable SOF irq */
320 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
321 __raw_writel(temp, pcdev->base + CSICR1);
322 }
323 }
324
325 static void mx1_camera_dma_irq(int channel, void *data)
326 {
327 struct mx1_camera_dev *pcdev = data;
328 struct mx1_buffer *buf;
329 struct videobuf_buffer *vb;
330 unsigned long flags;
331
332 spin_lock_irqsave(&pcdev->lock, flags);
333
334 imx_dma_disable(channel);
335
336 if (unlikely(!pcdev->active)) {
337 dev_err(pcdev->soc_host.dev, "DMA End IRQ with no active buffer\n");
338 goto out;
339 }
340
341 vb = &pcdev->active->vb;
342 buf = container_of(vb, struct mx1_buffer, vb);
343 WARN_ON(buf->inwork || list_empty(&vb->queue));
344 dev_dbg(pcdev->soc_host.dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
345 vb, vb->baddr, vb->bsize);
346
347 mx1_camera_wakeup(pcdev, vb, buf);
348 out:
349 spin_unlock_irqrestore(&pcdev->lock, flags);
350 }
351
352 static struct videobuf_queue_ops mx1_videobuf_ops = {
353 .buf_setup = mx1_videobuf_setup,
354 .buf_prepare = mx1_videobuf_prepare,
355 .buf_queue = mx1_videobuf_queue,
356 .buf_release = mx1_videobuf_release,
357 };
358
359 static void mx1_camera_init_videobuf(struct videobuf_queue *q,
360 struct soc_camera_device *icd)
361 {
362 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
363 struct mx1_camera_dev *pcdev = ici->priv;
364
365 videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, ici->dev,
366 &pcdev->lock,
367 V4L2_BUF_TYPE_VIDEO_CAPTURE,
368 V4L2_FIELD_NONE,
369 sizeof(struct mx1_buffer), icd);
370 }
371
372 static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
373 {
374 unsigned int mclk = pcdev->mclk;
375 unsigned long div;
376 unsigned long lcdclk;
377
378 lcdclk = clk_get_rate(pcdev->clk);
379
380 /* We verify platform_mclk_10khz != 0, so if anyone breaks it, here
381 * they get a nice Oops */
382 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
383
384 dev_dbg(pcdev->soc_host.dev, "System clock %lukHz, target freq %dkHz, "
385 "divisor %lu\n", lcdclk / 1000, mclk / 1000, div);
386
387 return div;
388 }
389
390 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
391 {
392 unsigned int csicr1 = CSICR1_EN;
393
394 dev_dbg(pcdev->soc_host.dev, "Activate device\n");
395
396 clk_enable(pcdev->clk);
397
398 /* enable CSI before doing anything else */
399 __raw_writel(csicr1, pcdev->base + CSICR1);
400
401 csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
402 csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
403 csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
404
405 __raw_writel(csicr1, pcdev->base + CSICR1);
406 }
407
408 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
409 {
410 dev_dbg(pcdev->soc_host.dev, "Deactivate device\n");
411
412 /* Disable all CSI interface */
413 __raw_writel(0x00, pcdev->base + CSICR1);
414
415 clk_disable(pcdev->clk);
416 }
417
418 /* The following two functions absolutely depend on the fact, that
419 * there can be only one camera on i.MX1/i.MXL camera sensor interface */
420 static int mx1_camera_add_device(struct soc_camera_device *icd)
421 {
422 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
423 struct mx1_camera_dev *pcdev = ici->priv;
424 int ret;
425
426 if (pcdev->icd) {
427 ret = -EBUSY;
428 goto ebusy;
429 }
430
431 dev_info(&icd->dev, "MX1 Camera driver attached to camera %d\n",
432 icd->devnum);
433
434 mx1_camera_activate(pcdev);
435 ret = icd->ops->init(icd);
436
437 if (!ret)
438 pcdev->icd = icd;
439
440 ebusy:
441 return ret;
442 }
443
444 static void mx1_camera_remove_device(struct soc_camera_device *icd)
445 {
446 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
447 struct mx1_camera_dev *pcdev = ici->priv;
448 unsigned int csicr1;
449
450 BUG_ON(icd != pcdev->icd);
451
452 /* disable interrupts */
453 csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
454 __raw_writel(csicr1, pcdev->base + CSICR1);
455
456 /* Stop DMA engine */
457 imx_dma_disable(pcdev->dma_chan);
458
459 dev_info(&icd->dev, "MX1 Camera driver detached from camera %d\n",
460 icd->devnum);
461
462 icd->ops->release(icd);
463
464 mx1_camera_deactivate(pcdev);
465
466 pcdev->icd = NULL;
467 }
468
469 static int mx1_camera_set_crop(struct soc_camera_device *icd,
470 struct v4l2_rect *rect)
471 {
472 return icd->ops->set_crop(icd, rect);
473 }
474
475 static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
476 {
477 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
478 struct mx1_camera_dev *pcdev = ici->priv;
479 unsigned long camera_flags, common_flags;
480 unsigned int csicr1;
481 int ret;
482
483 camera_flags = icd->ops->query_bus_param(icd);
484
485 /* MX1 supports only 8bit buswidth */
486 common_flags = soc_camera_bus_param_compatible(camera_flags,
487 CSI_BUS_FLAGS);
488 if (!common_flags)
489 return -EINVAL;
490
491 icd->buswidth = 8;
492
493 /* Make choises, based on platform choice */
494 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
495 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
496 if (!pcdev->pdata ||
497 pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
498 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
499 else
500 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
501 }
502
503 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
504 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
505 if (!pcdev->pdata ||
506 pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
507 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
508 else
509 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
510 }
511
512 if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
513 (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
514 if (!pcdev->pdata ||
515 pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
516 common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
517 else
518 common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
519 }
520
521 ret = icd->ops->set_bus_param(icd, common_flags);
522 if (ret < 0)
523 return ret;
524
525 csicr1 = __raw_readl(pcdev->base + CSICR1);
526
527 if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
528 csicr1 |= CSICR1_REDGE;
529 if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
530 csicr1 |= CSICR1_SOF_POL;
531 if (common_flags & SOCAM_DATA_ACTIVE_LOW)
532 csicr1 |= CSICR1_DATA_POL;
533
534 __raw_writel(csicr1, pcdev->base + CSICR1);
535
536 return 0;
537 }
538
539 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
540 struct v4l2_format *f)
541 {
542 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
543 const struct soc_camera_format_xlate *xlate;
544 struct v4l2_pix_format *pix = &f->fmt.pix;
545 int ret;
546
547 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
548 if (!xlate) {
549 dev_warn(ici->dev, "Format %x not found\n", pix->pixelformat);
550 return -EINVAL;
551 }
552
553 ret = icd->ops->set_fmt(icd, f);
554 if (!ret) {
555 icd->buswidth = xlate->buswidth;
556 icd->current_fmt = xlate->host_fmt;
557 }
558
559 return ret;
560 }
561
562 static int mx1_camera_try_fmt(struct soc_camera_device *icd,
563 struct v4l2_format *f)
564 {
565 /* TODO: limit to mx1 hardware capabilities */
566
567 /* limit to sensor capabilities */
568 return icd->ops->try_fmt(icd, f);
569 }
570
571 static int mx1_camera_reqbufs(struct soc_camera_file *icf,
572 struct v4l2_requestbuffers *p)
573 {
574 int i;
575
576 /* This is for locking debugging only. I removed spinlocks and now I
577 * check whether .prepare is ever called on a linked buffer, or whether
578 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
579 * it hadn't triggered */
580 for (i = 0; i < p->count; i++) {
581 struct mx1_buffer *buf = container_of(icf->vb_vidq.bufs[i],
582 struct mx1_buffer, vb);
583 buf->inwork = 0;
584 INIT_LIST_HEAD(&buf->vb.queue);
585 }
586
587 return 0;
588 }
589
590 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
591 {
592 struct soc_camera_file *icf = file->private_data;
593 struct mx1_buffer *buf;
594
595 buf = list_entry(icf->vb_vidq.stream.next, struct mx1_buffer,
596 vb.stream);
597
598 poll_wait(file, &buf->vb.done, pt);
599
600 if (buf->vb.state == VIDEOBUF_DONE ||
601 buf->vb.state == VIDEOBUF_ERROR)
602 return POLLIN | POLLRDNORM;
603
604 return 0;
605 }
606
607 static int mx1_camera_querycap(struct soc_camera_host *ici,
608 struct v4l2_capability *cap)
609 {
610 /* cap->name is set by the friendly caller:-> */
611 strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
612 cap->version = VERSION_CODE;
613 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
614
615 return 0;
616 }
617
618 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
619 .owner = THIS_MODULE,
620 .add = mx1_camera_add_device,
621 .remove = mx1_camera_remove_device,
622 .set_bus_param = mx1_camera_set_bus_param,
623 .set_crop = mx1_camera_set_crop,
624 .set_fmt = mx1_camera_set_fmt,
625 .try_fmt = mx1_camera_try_fmt,
626 .init_videobuf = mx1_camera_init_videobuf,
627 .reqbufs = mx1_camera_reqbufs,
628 .poll = mx1_camera_poll,
629 .querycap = mx1_camera_querycap,
630 };
631
632 static struct fiq_handler fh = {
633 .name = "csi_sof"
634 };
635
636 static int __init mx1_camera_probe(struct platform_device *pdev)
637 {
638 struct mx1_camera_dev *pcdev;
639 struct resource *res;
640 struct pt_regs regs;
641 struct clk *clk;
642 void __iomem *base;
643 unsigned int irq;
644 int err = 0;
645
646 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
647 irq = platform_get_irq(pdev, 0);
648 if (!res || !irq) {
649 err = -ENODEV;
650 goto exit;
651 }
652
653 clk = clk_get(&pdev->dev, "csi_clk");
654 if (IS_ERR(clk)) {
655 err = PTR_ERR(clk);
656 goto exit;
657 }
658
659 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
660 if (!pcdev) {
661 dev_err(&pdev->dev, "Could not allocate pcdev\n");
662 err = -ENOMEM;
663 goto exit_put_clk;
664 }
665
666 pcdev->res = res;
667 pcdev->clk = clk;
668
669 pcdev->pdata = pdev->dev.platform_data;
670
671 if (pcdev->pdata)
672 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
673
674 if (!pcdev->mclk) {
675 dev_warn(&pdev->dev,
676 "mclk_10khz == 0! Please, fix your platform data. "
677 "Using default 20MHz\n");
678 pcdev->mclk = 20000000;
679 }
680
681 INIT_LIST_HEAD(&pcdev->capture);
682 spin_lock_init(&pcdev->lock);
683
684 /*
685 * Request the regions.
686 */
687 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
688 err = -EBUSY;
689 goto exit_kfree;
690 }
691
692 base = ioremap(res->start, resource_size(res));
693 if (!base) {
694 err = -ENOMEM;
695 goto exit_release;
696 }
697 pcdev->irq = irq;
698 pcdev->base = base;
699
700 /* request dma */
701 pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
702 if (pcdev->dma_chan < 0) {
703 dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
704 err = -EBUSY;
705 goto exit_iounmap;
706 }
707 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
708
709 imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
710 pcdev);
711
712 imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
713 IMX_DMA_MEMSIZE_32, DMA_REQ_CSI_R, 0);
714 /* burst length : 16 words = 64 bytes */
715 imx_dma_config_burstlen(pcdev->dma_chan, 0);
716
717 /* request irq */
718 err = claim_fiq(&fh);
719 if (err) {
720 dev_err(&pdev->dev, "Camera interrupt register failed \n");
721 goto exit_free_dma;
722 }
723
724 set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
725 &mx1_camera_sof_fiq_start);
726
727 regs.ARM_r8 = DMA_BASE + DMA_DIMR;
728 regs.ARM_r9 = DMA_BASE + DMA_CCR(pcdev->dma_chan);
729 regs.ARM_r10 = (long)pcdev->base + CSICR1;
730 regs.ARM_fp = (long)pcdev->base + CSISR;
731 regs.ARM_sp = 1 << pcdev->dma_chan;
732 set_fiq_regs(&regs);
733
734 mxc_set_irq_fiq(irq, 1);
735 enable_fiq(irq);
736
737 pcdev->soc_host.drv_name = DRIVER_NAME;
738 pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
739 pcdev->soc_host.priv = pcdev;
740 pcdev->soc_host.dev = &pdev->dev;
741 pcdev->soc_host.nr = pdev->id;
742 err = soc_camera_host_register(&pcdev->soc_host);
743 if (err)
744 goto exit_free_irq;
745
746 dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
747
748 return 0;
749
750 exit_free_irq:
751 disable_fiq(irq);
752 mxc_set_irq_fiq(irq, 0);
753 release_fiq(&fh);
754 exit_free_dma:
755 imx_dma_free(pcdev->dma_chan);
756 exit_iounmap:
757 iounmap(base);
758 exit_release:
759 release_mem_region(res->start, resource_size(res));
760 exit_kfree:
761 kfree(pcdev);
762 exit_put_clk:
763 clk_put(clk);
764 exit:
765 return err;
766 }
767
768 static int __exit mx1_camera_remove(struct platform_device *pdev)
769 {
770 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
771 struct mx1_camera_dev *pcdev = container_of(soc_host,
772 struct mx1_camera_dev, soc_host);
773 struct resource *res;
774
775 imx_dma_free(pcdev->dma_chan);
776 disable_fiq(pcdev->irq);
777 mxc_set_irq_fiq(pcdev->irq, 0);
778 release_fiq(&fh);
779
780 clk_put(pcdev->clk);
781
782 soc_camera_host_unregister(soc_host);
783
784 iounmap(pcdev->base);
785
786 res = pcdev->res;
787 release_mem_region(res->start, resource_size(res));
788
789 kfree(pcdev);
790
791 dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
792
793 return 0;
794 }
795
796 static struct platform_driver mx1_camera_driver = {
797 .driver = {
798 .name = DRIVER_NAME,
799 },
800 .remove = __exit_p(mx1_camera_remove),
801 };
802
803 static int __init mx1_camera_init(void)
804 {
805 return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
806 }
807
808 static void __exit mx1_camera_exit(void)
809 {
810 return platform_driver_unregister(&mx1_camera_driver);
811 }
812
813 module_init(mx1_camera_init);
814 module_exit(mx1_camera_exit);
815
816 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
817 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
818 MODULE_LICENSE("GPL v2");
819 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux with added FPC-III support