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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
[mirror_ubuntu-kernels.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/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_device *icd;
106 struct mx1_camera_pdata *pdata;
107 struct mx1_buffer *active;
108 struct device *dev;
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->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->dev, "Failed to setup DMA sg list\n");
233
234 return ret;
235 }
236
237 static void mx1_videobuf_queue(struct videobuf_queue *vq,
238 struct videobuf_buffer *vb)
239 {
240 struct soc_camera_device *icd = vq->priv_data;
241 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
242 struct mx1_camera_dev *pcdev = ici->priv;
243 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
244 unsigned long flags;
245
246 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
247 vb, vb->baddr, vb->bsize);
248
249 spin_lock_irqsave(&pcdev->lock, flags);
250
251 list_add_tail(&vb->queue, &pcdev->capture);
252
253 vb->state = VIDEOBUF_ACTIVE;
254
255 if (!pcdev->active) {
256 pcdev->active = buf;
257
258 /* setup sg list for future DMA */
259 if (!mx1_camera_setup_dma(pcdev)) {
260 unsigned int temp;
261 /* enable SOF irq */
262 temp = __raw_readl(pcdev->base + CSICR1) |
263 CSICR1_SOF_INTEN;
264 __raw_writel(temp, pcdev->base + CSICR1);
265 }
266 }
267
268 spin_unlock_irqrestore(&pcdev->lock, flags);
269 }
270
271 static void mx1_videobuf_release(struct videobuf_queue *vq,
272 struct videobuf_buffer *vb)
273 {
274 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
275 #ifdef DEBUG
276 struct soc_camera_device *icd = vq->priv_data;
277
278 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
279 vb, vb->baddr, vb->bsize);
280
281 switch (vb->state) {
282 case VIDEOBUF_ACTIVE:
283 dev_dbg(&icd->dev, "%s (active)\n", __func__);
284 break;
285 case VIDEOBUF_QUEUED:
286 dev_dbg(&icd->dev, "%s (queued)\n", __func__);
287 break;
288 case VIDEOBUF_PREPARED:
289 dev_dbg(&icd->dev, "%s (prepared)\n", __func__);
290 break;
291 default:
292 dev_dbg(&icd->dev, "%s (unknown)\n", __func__);
293 break;
294 }
295 #endif
296
297 free_buffer(vq, buf);
298 }
299
300 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
301 struct videobuf_buffer *vb,
302 struct mx1_buffer *buf)
303 {
304 /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
305 list_del_init(&vb->queue);
306 vb->state = VIDEOBUF_DONE;
307 do_gettimeofday(&vb->ts);
308 vb->field_count++;
309 wake_up(&vb->done);
310
311 if (list_empty(&pcdev->capture)) {
312 pcdev->active = NULL;
313 return;
314 }
315
316 pcdev->active = list_entry(pcdev->capture.next,
317 struct mx1_buffer, vb.queue);
318
319 /* setup sg list for future DMA */
320 if (likely(!mx1_camera_setup_dma(pcdev))) {
321 unsigned int temp;
322
323 /* enable SOF irq */
324 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
325 __raw_writel(temp, pcdev->base + CSICR1);
326 }
327 }
328
329 static void mx1_camera_dma_irq(int channel, void *data)
330 {
331 struct mx1_camera_dev *pcdev = data;
332 struct mx1_buffer *buf;
333 struct videobuf_buffer *vb;
334 unsigned long flags;
335
336 spin_lock_irqsave(&pcdev->lock, flags);
337
338 imx_dma_disable(channel);
339
340 if (unlikely(!pcdev->active)) {
341 dev_err(pcdev->dev, "DMA End IRQ with no active buffer\n");
342 goto out;
343 }
344
345 vb = &pcdev->active->vb;
346 buf = container_of(vb, struct mx1_buffer, vb);
347 WARN_ON(buf->inwork || list_empty(&vb->queue));
348 dev_dbg(pcdev->dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
349 vb, vb->baddr, vb->bsize);
350
351 mx1_camera_wakeup(pcdev, vb, buf);
352 out:
353 spin_unlock_irqrestore(&pcdev->lock, flags);
354 }
355
356 static struct videobuf_queue_ops mx1_videobuf_ops = {
357 .buf_setup = mx1_videobuf_setup,
358 .buf_prepare = mx1_videobuf_prepare,
359 .buf_queue = mx1_videobuf_queue,
360 .buf_release = mx1_videobuf_release,
361 };
362
363 static void mx1_camera_init_videobuf(struct videobuf_queue *q,
364 struct soc_camera_device *icd)
365 {
366 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
367 struct mx1_camera_dev *pcdev = ici->priv;
368
369 videobuf_queue_dma_contig_init(q, &mx1_videobuf_ops, pcdev->dev,
370 &pcdev->lock,
371 V4L2_BUF_TYPE_VIDEO_CAPTURE,
372 V4L2_FIELD_NONE,
373 sizeof(struct mx1_buffer), icd);
374 }
375
376 static int mclk_get_divisor(struct mx1_camera_dev *pcdev)
377 {
378 unsigned int mclk = pcdev->mclk;
379 unsigned long div;
380 unsigned long lcdclk;
381
382 lcdclk = clk_get_rate(pcdev->clk);
383
384 /* We verify platform_mclk_10khz != 0, so if anyone breaks it, here
385 * they get a nice Oops */
386 div = (lcdclk + 2 * mclk - 1) / (2 * mclk) - 1;
387
388 dev_dbg(pcdev->dev, "System clock %lukHz, target freq %dkHz, "
389 "divisor %lu\n", lcdclk / 1000, mclk / 1000, div);
390
391 return div;
392 }
393
394 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
395 {
396 unsigned int csicr1 = CSICR1_EN;
397
398 dev_dbg(pcdev->dev, "Activate device\n");
399
400 clk_enable(pcdev->clk);
401
402 /* enable CSI before doing anything else */
403 __raw_writel(csicr1, pcdev->base + CSICR1);
404
405 csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
406 csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
407 csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
408
409 __raw_writel(csicr1, pcdev->base + CSICR1);
410 }
411
412 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
413 {
414 dev_dbg(pcdev->dev, "Deactivate device\n");
415
416 /* Disable all CSI interface */
417 __raw_writel(0x00, pcdev->base + CSICR1);
418
419 clk_disable(pcdev->clk);
420 }
421
422 /* The following two functions absolutely depend on the fact, that
423 * there can be only one camera on i.MX1/i.MXL camera sensor interface */
424 static int mx1_camera_add_device(struct soc_camera_device *icd)
425 {
426 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
427 struct mx1_camera_dev *pcdev = ici->priv;
428 int ret;
429
430 if (pcdev->icd) {
431 ret = -EBUSY;
432 goto ebusy;
433 }
434
435 dev_info(&icd->dev, "MX1 Camera driver attached to camera %d\n",
436 icd->devnum);
437
438 mx1_camera_activate(pcdev);
439 ret = icd->ops->init(icd);
440
441 if (!ret)
442 pcdev->icd = icd;
443
444 ebusy:
445 return ret;
446 }
447
448 static void mx1_camera_remove_device(struct soc_camera_device *icd)
449 {
450 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
451 struct mx1_camera_dev *pcdev = ici->priv;
452 unsigned int csicr1;
453
454 BUG_ON(icd != pcdev->icd);
455
456 /* disable interrupts */
457 csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
458 __raw_writel(csicr1, pcdev->base + CSICR1);
459
460 /* Stop DMA engine */
461 imx_dma_disable(pcdev->dma_chan);
462
463 dev_info(&icd->dev, "MX1 Camera driver detached from camera %d\n",
464 icd->devnum);
465
466 icd->ops->release(icd);
467
468 mx1_camera_deactivate(pcdev);
469
470 pcdev->icd = NULL;
471 }
472
473 static int mx1_camera_set_crop(struct soc_camera_device *icd,
474 struct v4l2_rect *rect)
475 {
476 return icd->ops->set_crop(icd, rect);
477 }
478
479 static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
480 {
481 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
482 struct mx1_camera_dev *pcdev = ici->priv;
483 unsigned long camera_flags, common_flags;
484 unsigned int csicr1;
485 int ret;
486
487 camera_flags = icd->ops->query_bus_param(icd);
488
489 /* MX1 supports only 8bit buswidth */
490 common_flags = soc_camera_bus_param_compatible(camera_flags,
491 CSI_BUS_FLAGS);
492 if (!common_flags)
493 return -EINVAL;
494
495 icd->buswidth = 8;
496
497 /* Make choises, based on platform choice */
498 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
499 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
500 if (!pcdev->pdata ||
501 pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
502 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
503 else
504 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
505 }
506
507 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
508 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
509 if (!pcdev->pdata ||
510 pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
511 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
512 else
513 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
514 }
515
516 if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
517 (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
518 if (!pcdev->pdata ||
519 pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
520 common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
521 else
522 common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
523 }
524
525 ret = icd->ops->set_bus_param(icd, common_flags);
526 if (ret < 0)
527 return ret;
528
529 csicr1 = __raw_readl(pcdev->base + CSICR1);
530
531 if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
532 csicr1 |= CSICR1_REDGE;
533 if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
534 csicr1 |= CSICR1_SOF_POL;
535 if (common_flags & SOCAM_DATA_ACTIVE_LOW)
536 csicr1 |= CSICR1_DATA_POL;
537
538 __raw_writel(csicr1, pcdev->base + CSICR1);
539
540 return 0;
541 }
542
543 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
544 struct v4l2_format *f)
545 {
546 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
547 const struct soc_camera_format_xlate *xlate;
548 struct v4l2_pix_format *pix = &f->fmt.pix;
549 int ret;
550
551 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
552 if (!xlate) {
553 dev_warn(&ici->dev, "Format %x not found\n", pix->pixelformat);
554 return -EINVAL;
555 }
556
557 ret = icd->ops->set_fmt(icd, f);
558 if (!ret) {
559 icd->buswidth = xlate->buswidth;
560 icd->current_fmt = xlate->host_fmt;
561 }
562
563 return ret;
564 }
565
566 static int mx1_camera_try_fmt(struct soc_camera_device *icd,
567 struct v4l2_format *f)
568 {
569 /* TODO: limit to mx1 hardware capabilities */
570
571 /* limit to sensor capabilities */
572 return icd->ops->try_fmt(icd, f);
573 }
574
575 static int mx1_camera_reqbufs(struct soc_camera_file *icf,
576 struct v4l2_requestbuffers *p)
577 {
578 int i;
579
580 /* This is for locking debugging only. I removed spinlocks and now I
581 * check whether .prepare is ever called on a linked buffer, or whether
582 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
583 * it hadn't triggered */
584 for (i = 0; i < p->count; i++) {
585 struct mx1_buffer *buf = container_of(icf->vb_vidq.bufs[i],
586 struct mx1_buffer, vb);
587 buf->inwork = 0;
588 INIT_LIST_HEAD(&buf->vb.queue);
589 }
590
591 return 0;
592 }
593
594 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
595 {
596 struct soc_camera_file *icf = file->private_data;
597 struct mx1_buffer *buf;
598
599 buf = list_entry(icf->vb_vidq.stream.next, struct mx1_buffer,
600 vb.stream);
601
602 poll_wait(file, &buf->vb.done, pt);
603
604 if (buf->vb.state == VIDEOBUF_DONE ||
605 buf->vb.state == VIDEOBUF_ERROR)
606 return POLLIN | POLLRDNORM;
607
608 return 0;
609 }
610
611 static int mx1_camera_querycap(struct soc_camera_host *ici,
612 struct v4l2_capability *cap)
613 {
614 /* cap->name is set by the friendly caller:-> */
615 strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
616 cap->version = VERSION_CODE;
617 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
618
619 return 0;
620 }
621
622 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
623 .owner = THIS_MODULE,
624 .add = mx1_camera_add_device,
625 .remove = mx1_camera_remove_device,
626 .set_bus_param = mx1_camera_set_bus_param,
627 .set_crop = mx1_camera_set_crop,
628 .set_fmt = mx1_camera_set_fmt,
629 .try_fmt = mx1_camera_try_fmt,
630 .init_videobuf = mx1_camera_init_videobuf,
631 .reqbufs = mx1_camera_reqbufs,
632 .poll = mx1_camera_poll,
633 .querycap = mx1_camera_querycap,
634 };
635
636 /* Should be allocated dynamically too, but we have only one. */
637 static struct soc_camera_host mx1_soc_camera_host = {
638 .drv_name = DRIVER_NAME,
639 .ops = &mx1_soc_camera_host_ops,
640 };
641
642 static struct fiq_handler fh = {
643 .name = "csi_sof"
644 };
645
646 static int __init mx1_camera_probe(struct platform_device *pdev)
647 {
648 struct mx1_camera_dev *pcdev;
649 struct resource *res;
650 struct pt_regs regs;
651 struct clk *clk;
652 void __iomem *base;
653 unsigned int irq;
654 int err = 0;
655
656 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
657 irq = platform_get_irq(pdev, 0);
658 if (!res || !irq) {
659 err = -ENODEV;
660 goto exit;
661 }
662
663 clk = clk_get(&pdev->dev, "csi_clk");
664 if (IS_ERR(clk)) {
665 err = PTR_ERR(clk);
666 goto exit;
667 }
668
669 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
670 if (!pcdev) {
671 dev_err(&pdev->dev, "Could not allocate pcdev\n");
672 err = -ENOMEM;
673 goto exit_put_clk;
674 }
675
676 dev_set_drvdata(&pdev->dev, pcdev);
677 pcdev->res = res;
678 pcdev->clk = clk;
679
680 pcdev->pdata = pdev->dev.platform_data;
681
682 if (pcdev->pdata)
683 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
684
685 if (!pcdev->mclk) {
686 dev_warn(&pdev->dev,
687 "mclk_10khz == 0! Please, fix your platform data. "
688 "Using default 20MHz\n");
689 pcdev->mclk = 20000000;
690 }
691
692 INIT_LIST_HEAD(&pcdev->capture);
693 spin_lock_init(&pcdev->lock);
694
695 /*
696 * Request the regions.
697 */
698 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
699 err = -EBUSY;
700 goto exit_kfree;
701 }
702
703 base = ioremap(res->start, resource_size(res));
704 if (!base) {
705 err = -ENOMEM;
706 goto exit_release;
707 }
708 pcdev->irq = irq;
709 pcdev->base = base;
710 pcdev->dev = &pdev->dev;
711
712 /* request dma */
713 pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
714 if (pcdev->dma_chan < 0) {
715 dev_err(pcdev->dev, "Can't request DMA for MX1 CSI\n");
716 err = -EBUSY;
717 goto exit_iounmap;
718 }
719 dev_dbg(pcdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
720
721 imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
722 pcdev);
723
724 imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
725 IMX_DMA_MEMSIZE_32, DMA_REQ_CSI_R, 0);
726 /* burst length : 16 words = 64 bytes */
727 imx_dma_config_burstlen(pcdev->dma_chan, 0);
728
729 /* request irq */
730 err = claim_fiq(&fh);
731 if (err) {
732 dev_err(pcdev->dev, "Camera interrupt register failed \n");
733 goto exit_free_dma;
734 }
735
736 set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
737 &mx1_camera_sof_fiq_start);
738
739 regs.ARM_r8 = DMA_BASE + DMA_DIMR;
740 regs.ARM_r9 = DMA_BASE + DMA_CCR(pcdev->dma_chan);
741 regs.ARM_r10 = (long)pcdev->base + CSICR1;
742 regs.ARM_fp = (long)pcdev->base + CSISR;
743 regs.ARM_sp = 1 << pcdev->dma_chan;
744 set_fiq_regs(&regs);
745
746 mxc_set_irq_fiq(irq, 1);
747 enable_fiq(irq);
748
749 mx1_soc_camera_host.priv = pcdev;
750 mx1_soc_camera_host.dev.parent = &pdev->dev;
751 mx1_soc_camera_host.nr = pdev->id;
752 err = soc_camera_host_register(&mx1_soc_camera_host);
753 if (err)
754 goto exit_free_irq;
755
756 dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
757
758 return 0;
759
760 exit_free_irq:
761 disable_fiq(irq);
762 mxc_set_irq_fiq(irq, 0);
763 release_fiq(&fh);
764 exit_free_dma:
765 imx_dma_free(pcdev->dma_chan);
766 exit_iounmap:
767 iounmap(base);
768 exit_release:
769 release_mem_region(res->start, resource_size(res));
770 exit_kfree:
771 kfree(pcdev);
772 exit_put_clk:
773 clk_put(clk);
774 exit:
775 return err;
776 }
777
778 static int __exit mx1_camera_remove(struct platform_device *pdev)
779 {
780 struct mx1_camera_dev *pcdev = platform_get_drvdata(pdev);
781 struct resource *res;
782
783 imx_dma_free(pcdev->dma_chan);
784 disable_fiq(pcdev->irq);
785 mxc_set_irq_fiq(pcdev->irq, 0);
786 release_fiq(&fh);
787
788 clk_put(pcdev->clk);
789
790 soc_camera_host_unregister(&mx1_soc_camera_host);
791
792 iounmap(pcdev->base);
793
794 res = pcdev->res;
795 release_mem_region(res->start, resource_size(res));
796
797 kfree(pcdev);
798
799 dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
800
801 return 0;
802 }
803
804 static struct platform_driver mx1_camera_driver = {
805 .driver = {
806 .name = DRIVER_NAME,
807 },
808 .remove = __exit_p(mx1_camera_remove),
809 };
810
811 static int __init mx1_camera_init(void)
812 {
813 return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
814 }
815
816 static void __exit mx1_camera_exit(void)
817 {
818 return platform_driver_unregister(&mx1_camera_driver);
819 }
820
821 module_init(mx1_camera_init);
822 module_exit(mx1_camera_exit);
823
824 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
825 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
826 MODULE_LICENSE("GPL v2");
827 MODULE_ALIAS("platform:" DRIVER_NAME);
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