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First Support on Ginger and OMAP TI
[linux-ginger.git] / drivers / media / video / mx1_camera.c
blob72802291e81238f5f1797cd7fd6c2336255803d1
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/time.h>
33 #include <linux/version.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
41 #include <asm/dma.h>
42 #include <asm/fiq.h>
43 #include <mach/dma-mx1-mx2.h>
44 #include <mach/hardware.h>
45 #include <mach/mx1_camera.h>
46
47 /*
48 * CSI registers
49 */
50 #define DMA_CCR(x) (0x8c + ((x) << 6)) /* Control Registers */
51 #define DMA_DIMR 0x08 /* Interrupt mask Register */
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 const struct soc_camera_data_format *fmt;
99 int inwork;
100 };
101
102 /* i.MX1/i.MXL is only supposed to handle one camera on its Camera Sensor
103 * Interface. If anyone ever builds hardware to enable more than
104 * one camera, they will have to modify this driver too */
105 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->user_width * icd->user_height *
131 ((icd->current_fmt->depth + 7) >> 3);
132
133 if (!*count)
134 *count = 32;
135
136 while (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
137 (*count)--;
138
139 dev_dbg(icd->dev.parent, "count=%d, size=%d\n", *count, *size);
140
141 return 0;
142 }
143
144 static void free_buffer(struct videobuf_queue *vq, struct mx1_buffer *buf)
145 {
146 struct soc_camera_device *icd = vq->priv_data;
147 struct videobuf_buffer *vb = &buf->vb;
148
149 BUG_ON(in_interrupt());
150
151 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
152 vb, vb->baddr, vb->bsize);
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 videobuf_waiton(vb, 0, 0);
157 videobuf_dma_contig_free(vq, vb);
158
159 vb->state = VIDEOBUF_NEEDS_INIT;
160 }
161
162 static int mx1_videobuf_prepare(struct videobuf_queue *vq,
163 struct videobuf_buffer *vb, enum v4l2_field field)
164 {
165 struct soc_camera_device *icd = vq->priv_data;
166 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
167 int ret;
168
169 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
170 vb, vb->baddr, vb->bsize);
171
172 /* Added list head initialization on alloc */
173 WARN_ON(!list_empty(&vb->queue));
174
175 BUG_ON(NULL == icd->current_fmt);
176
177 /* I think, in buf_prepare you only have to protect global data,
178 * the actual buffer is yours */
179 buf->inwork = 1;
180
181 if (buf->fmt != icd->current_fmt ||
182 vb->width != icd->user_width ||
183 vb->height != icd->user_height ||
184 vb->field != field) {
185 buf->fmt = icd->current_fmt;
186 vb->width = icd->user_width;
187 vb->height = icd->user_height;
188 vb->field = field;
189 vb->state = VIDEOBUF_NEEDS_INIT;
190 }
191
192 vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
193 if (0 != vb->baddr && vb->bsize < vb->size) {
194 ret = -EINVAL;
195 goto out;
196 }
197
198 if (vb->state == VIDEOBUF_NEEDS_INIT) {
199 ret = videobuf_iolock(vq, vb, NULL);
200 if (ret)
201 goto fail;
202
203 vb->state = VIDEOBUF_PREPARED;
204 }
205
206 buf->inwork = 0;
207
208 return 0;
209
210 fail:
211 free_buffer(vq, buf);
212 out:
213 buf->inwork = 0;
214 return ret;
215 }
216
217 static int mx1_camera_setup_dma(struct mx1_camera_dev *pcdev)
218 {
219 struct videobuf_buffer *vbuf = &pcdev->active->vb;
220 struct device *dev = pcdev->icd->dev.parent;
221 int ret;
222
223 if (unlikely(!pcdev->active)) {
224 dev_err(dev, "DMA End IRQ with no active buffer\n");
225 return -EFAULT;
226 }
227
228 /* setup sg list for future DMA */
229 ret = imx_dma_setup_single(pcdev->dma_chan,
230 videobuf_to_dma_contig(vbuf),
231 vbuf->size, pcdev->res->start +
232 CSIRXR, DMA_MODE_READ);
233 if (unlikely(ret))
234 dev_err(dev, "Failed to setup DMA sg list\n");
235
236 return ret;
237 }
238
239 /* Called under spinlock_irqsave(&pcdev->lock, ...) */
240 static void mx1_videobuf_queue(struct videobuf_queue *vq,
241 struct videobuf_buffer *vb)
242 {
243 struct soc_camera_device *icd = vq->priv_data;
244 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
245 struct mx1_camera_dev *pcdev = ici->priv;
246 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
247
248 dev_dbg(icd->dev.parent, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
249 vb, vb->baddr, vb->bsize);
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
269 static void mx1_videobuf_release(struct videobuf_queue *vq,
270 struct videobuf_buffer *vb)
271 {
272 struct mx1_buffer *buf = container_of(vb, struct mx1_buffer, vb);
273 #ifdef DEBUG
274 struct soc_camera_device *icd = vq->priv_data;
275 struct device *dev = icd->dev.parent;
276
277 dev_dbg(dev, "%s (vb=0x%p) 0x%08lx %d\n", __func__,
278 vb, vb->baddr, vb->bsize);
279
280 switch (vb->state) {
281 case VIDEOBUF_ACTIVE:
282 dev_dbg(dev, "%s (active)\n", __func__);
283 break;
284 case VIDEOBUF_QUEUED:
285 dev_dbg(dev, "%s (queued)\n", __func__);
286 break;
287 case VIDEOBUF_PREPARED:
288 dev_dbg(dev, "%s (prepared)\n", __func__);
289 break;
290 default:
291 dev_dbg(dev, "%s (unknown)\n", __func__);
292 break;
293 }
294 #endif
295
296 free_buffer(vq, buf);
297 }
298
299 static void mx1_camera_wakeup(struct mx1_camera_dev *pcdev,
300 struct videobuf_buffer *vb,
301 struct mx1_buffer *buf)
302 {
303 /* _init is used to debug races, see comment in mx1_camera_reqbufs() */
304 list_del_init(&vb->queue);
305 vb->state = VIDEOBUF_DONE;
306 do_gettimeofday(&vb->ts);
307 vb->field_count++;
308 wake_up(&vb->done);
309
310 if (list_empty(&pcdev->capture)) {
311 pcdev->active = NULL;
312 return;
313 }
314
315 pcdev->active = list_entry(pcdev->capture.next,
316 struct mx1_buffer, vb.queue);
317
318 /* setup sg list for future DMA */
319 if (likely(!mx1_camera_setup_dma(pcdev))) {
320 unsigned int temp;
321
322 /* enable SOF irq */
323 temp = __raw_readl(pcdev->base + CSICR1) | CSICR1_SOF_INTEN;
324 __raw_writel(temp, pcdev->base + CSICR1);
325 }
326 }
327
328 static void mx1_camera_dma_irq(int channel, void *data)
329 {
330 struct mx1_camera_dev *pcdev = data;
331 struct device *dev = pcdev->icd->dev.parent;
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(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(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, icd->dev.parent,
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->icd->dev.parent,
389 "System clock %lukHz, target freq %dkHz, divisor %lu\n",
390 lcdclk / 1000, mclk / 1000, div);
391
392 return div;
393 }
394
395 static void mx1_camera_activate(struct mx1_camera_dev *pcdev)
396 {
397 unsigned int csicr1 = CSICR1_EN;
398
399 dev_dbg(pcdev->icd->dev.parent, "Activate device\n");
400
401 clk_enable(pcdev->clk);
402
403 /* enable CSI before doing anything else */
404 __raw_writel(csicr1, pcdev->base + CSICR1);
405
406 csicr1 |= CSICR1_MCLKEN | CSICR1_FCC | CSICR1_GCLK_MODE;
407 csicr1 |= CSICR1_MCLKDIV(mclk_get_divisor(pcdev));
408 csicr1 |= CSICR1_RXFF_LEVEL(2); /* 16 words */
409
410 __raw_writel(csicr1, pcdev->base + CSICR1);
411 }
412
413 static void mx1_camera_deactivate(struct mx1_camera_dev *pcdev)
414 {
415 dev_dbg(pcdev->icd->dev.parent, "Deactivate device\n");
416
417 /* Disable all CSI interface */
418 __raw_writel(0x00, pcdev->base + CSICR1);
419
420 clk_disable(pcdev->clk);
421 }
422
423 /* The following two functions absolutely depend on the fact, that
424 * there can be only one camera on i.MX1/i.MXL camera sensor interface */
425 static int mx1_camera_add_device(struct soc_camera_device *icd)
426 {
427 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
428 struct mx1_camera_dev *pcdev = ici->priv;
429 int ret;
430
431 if (pcdev->icd) {
432 ret = -EBUSY;
433 goto ebusy;
434 }
435
436 dev_info(icd->dev.parent, "MX1 Camera driver attached to camera %d\n",
437 icd->devnum);
438
439 mx1_camera_activate(pcdev);
440
441 pcdev->icd = icd;
442
443 ebusy:
444 return ret;
445 }
446
447 static void mx1_camera_remove_device(struct soc_camera_device *icd)
448 {
449 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
450 struct mx1_camera_dev *pcdev = ici->priv;
451 unsigned int csicr1;
452
453 BUG_ON(icd != pcdev->icd);
454
455 /* disable interrupts */
456 csicr1 = __raw_readl(pcdev->base + CSICR1) & ~CSI_IRQ_MASK;
457 __raw_writel(csicr1, pcdev->base + CSICR1);
458
459 /* Stop DMA engine */
460 imx_dma_disable(pcdev->dma_chan);
461
462 dev_info(icd->dev.parent, "MX1 Camera driver detached from camera %d\n",
463 icd->devnum);
464
465 mx1_camera_deactivate(pcdev);
466
467 pcdev->icd = NULL;
468 }
469
470 static int mx1_camera_set_crop(struct soc_camera_device *icd,
471 struct v4l2_crop *a)
472 {
473 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
474
475 return v4l2_subdev_call(sd, video, s_crop, a);
476 }
477
478 static int mx1_camera_set_bus_param(struct soc_camera_device *icd, __u32 pixfmt)
479 {
480 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
481 struct mx1_camera_dev *pcdev = ici->priv;
482 unsigned long camera_flags, common_flags;
483 unsigned int csicr1;
484 int ret;
485
486 camera_flags = icd->ops->query_bus_param(icd);
487
488 /* MX1 supports only 8bit buswidth */
489 common_flags = soc_camera_bus_param_compatible(camera_flags,
490 CSI_BUS_FLAGS);
491 if (!common_flags)
492 return -EINVAL;
493
494 icd->buswidth = 8;
495
496 /* Make choises, based on platform choice */
497 if ((common_flags & SOCAM_VSYNC_ACTIVE_HIGH) &&
498 (common_flags & SOCAM_VSYNC_ACTIVE_LOW)) {
499 if (!pcdev->pdata ||
500 pcdev->pdata->flags & MX1_CAMERA_VSYNC_HIGH)
501 common_flags &= ~SOCAM_VSYNC_ACTIVE_LOW;
502 else
503 common_flags &= ~SOCAM_VSYNC_ACTIVE_HIGH;
504 }
505
506 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
507 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
508 if (!pcdev->pdata ||
509 pcdev->pdata->flags & MX1_CAMERA_PCLK_RISING)
510 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
511 else
512 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
513 }
514
515 if ((common_flags & SOCAM_DATA_ACTIVE_HIGH) &&
516 (common_flags & SOCAM_DATA_ACTIVE_LOW)) {
517 if (!pcdev->pdata ||
518 pcdev->pdata->flags & MX1_CAMERA_DATA_HIGH)
519 common_flags &= ~SOCAM_DATA_ACTIVE_LOW;
520 else
521 common_flags &= ~SOCAM_DATA_ACTIVE_HIGH;
522 }
523
524 ret = icd->ops->set_bus_param(icd, common_flags);
525 if (ret < 0)
526 return ret;
527
528 csicr1 = __raw_readl(pcdev->base + CSICR1);
529
530 if (common_flags & SOCAM_PCLK_SAMPLE_RISING)
531 csicr1 |= CSICR1_REDGE;
532 if (common_flags & SOCAM_VSYNC_ACTIVE_HIGH)
533 csicr1 |= CSICR1_SOF_POL;
534 if (common_flags & SOCAM_DATA_ACTIVE_LOW)
535 csicr1 |= CSICR1_DATA_POL;
536
537 __raw_writel(csicr1, pcdev->base + CSICR1);
538
539 return 0;
540 }
541
542 static int mx1_camera_set_fmt(struct soc_camera_device *icd,
543 struct v4l2_format *f)
544 {
545 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
546 const struct soc_camera_format_xlate *xlate;
547 struct v4l2_pix_format *pix = &f->fmt.pix;
548 int ret;
549
550 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
551 if (!xlate) {
552 dev_warn(icd->dev.parent, "Format %x not found\n",
553 pix->pixelformat);
554 return -EINVAL;
555 }
556
557 ret = v4l2_subdev_call(sd, video, s_fmt, 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 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
570 /* TODO: limit to mx1 hardware capabilities */
571
572 /* limit to sensor capabilities */
573 return v4l2_subdev_call(sd, video, try_fmt, f);
574 }
575
576 static int mx1_camera_reqbufs(struct soc_camera_file *icf,
577 struct v4l2_requestbuffers *p)
578 {
579 int i;
580
581 /* This is for locking debugging only. I removed spinlocks and now I
582 * check whether .prepare is ever called on a linked buffer, or whether
583 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
584 * it hadn't triggered */
585 for (i = 0; i < p->count; i++) {
586 struct mx1_buffer *buf = container_of(icf->vb_vidq.bufs[i],
587 struct mx1_buffer, vb);
588 buf->inwork = 0;
589 INIT_LIST_HEAD(&buf->vb.queue);
590 }
591
592 return 0;
593 }
594
595 static unsigned int mx1_camera_poll(struct file *file, poll_table *pt)
596 {
597 struct soc_camera_file *icf = file->private_data;
598 struct mx1_buffer *buf;
599
600 buf = list_entry(icf->vb_vidq.stream.next, struct mx1_buffer,
601 vb.stream);
602
603 poll_wait(file, &buf->vb.done, pt);
604
605 if (buf->vb.state == VIDEOBUF_DONE ||
606 buf->vb.state == VIDEOBUF_ERROR)
607 return POLLIN | POLLRDNORM;
608
609 return 0;
610 }
611
612 static int mx1_camera_querycap(struct soc_camera_host *ici,
613 struct v4l2_capability *cap)
614 {
615 /* cap->name is set by the friendly caller:-> */
616 strlcpy(cap->card, "i.MX1/i.MXL Camera", sizeof(cap->card));
617 cap->version = VERSION_CODE;
618 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
619
620 return 0;
621 }
622
623 static struct soc_camera_host_ops mx1_soc_camera_host_ops = {
624 .owner = THIS_MODULE,
625 .add = mx1_camera_add_device,
626 .remove = mx1_camera_remove_device,
627 .set_bus_param = mx1_camera_set_bus_param,
628 .set_crop = mx1_camera_set_crop,
629 .set_fmt = mx1_camera_set_fmt,
630 .try_fmt = mx1_camera_try_fmt,
631 .init_videobuf = mx1_camera_init_videobuf,
632 .reqbufs = mx1_camera_reqbufs,
633 .poll = mx1_camera_poll,
634 .querycap = mx1_camera_querycap,
635 };
636
637 static struct fiq_handler fh = {
638 .name = "csi_sof"
639 };
640
641 static int __init mx1_camera_probe(struct platform_device *pdev)
642 {
643 struct mx1_camera_dev *pcdev;
644 struct resource *res;
645 struct pt_regs regs;
646 struct clk *clk;
647 void __iomem *base;
648 unsigned int irq;
649 int err = 0;
650
651 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
652 irq = platform_get_irq(pdev, 0);
653 if (!res || !irq) {
654 err = -ENODEV;
655 goto exit;
656 }
657
658 clk = clk_get(&pdev->dev, "csi_clk");
659 if (IS_ERR(clk)) {
660 err = PTR_ERR(clk);
661 goto exit;
662 }
663
664 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
665 if (!pcdev) {
666 dev_err(&pdev->dev, "Could not allocate pcdev\n");
667 err = -ENOMEM;
668 goto exit_put_clk;
669 }
670
671 pcdev->res = res;
672 pcdev->clk = clk;
673
674 pcdev->pdata = pdev->dev.platform_data;
675
676 if (pcdev->pdata)
677 pcdev->mclk = pcdev->pdata->mclk_10khz * 10000;
678
679 if (!pcdev->mclk) {
680 dev_warn(&pdev->dev,
681 "mclk_10khz == 0! Please, fix your platform data. "
682 "Using default 20MHz\n");
683 pcdev->mclk = 20000000;
684 }
685
686 INIT_LIST_HEAD(&pcdev->capture);
687 spin_lock_init(&pcdev->lock);
688
689 /*
690 * Request the regions.
691 */
692 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
693 err = -EBUSY;
694 goto exit_kfree;
695 }
696
697 base = ioremap(res->start, resource_size(res));
698 if (!base) {
699 err = -ENOMEM;
700 goto exit_release;
701 }
702 pcdev->irq = irq;
703 pcdev->base = base;
704
705 /* request dma */
706 pcdev->dma_chan = imx_dma_request_by_prio(DRIVER_NAME, DMA_PRIO_HIGH);
707 if (pcdev->dma_chan < 0) {
708 dev_err(&pdev->dev, "Can't request DMA for MX1 CSI\n");
709 err = -EBUSY;
710 goto exit_iounmap;
711 }
712 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_chan);
713
714 imx_dma_setup_handlers(pcdev->dma_chan, mx1_camera_dma_irq, NULL,
715 pcdev);
716
717 imx_dma_config_channel(pcdev->dma_chan, IMX_DMA_TYPE_FIFO,
718 IMX_DMA_MEMSIZE_32, DMA_REQ_CSI_R, 0);
719 /* burst length : 16 words = 64 bytes */
720 imx_dma_config_burstlen(pcdev->dma_chan, 0);
721
722 /* request irq */
723 err = claim_fiq(&fh);
724 if (err) {
725 dev_err(&pdev->dev, "Camera interrupt register failed \n");
726 goto exit_free_dma;
727 }
728
729 set_fiq_handler(&mx1_camera_sof_fiq_start, &mx1_camera_sof_fiq_end -
730 &mx1_camera_sof_fiq_start);
731
732 regs.ARM_r8 = DMA_BASE + DMA_DIMR;
733 regs.ARM_r9 = DMA_BASE + DMA_CCR(pcdev->dma_chan);
734 regs.ARM_r10 = (long)pcdev->base + CSICR1;
735 regs.ARM_fp = (long)pcdev->base + CSISR;
736 regs.ARM_sp = 1 << pcdev->dma_chan;
737 set_fiq_regs(&regs);
738
739 mxc_set_irq_fiq(irq, 1);
740 enable_fiq(irq);
741
742 pcdev->soc_host.drv_name = DRIVER_NAME;
743 pcdev->soc_host.ops = &mx1_soc_camera_host_ops;
744 pcdev->soc_host.priv = pcdev;
745 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
746 pcdev->soc_host.nr = pdev->id;
747 err = soc_camera_host_register(&pcdev->soc_host);
748 if (err)
749 goto exit_free_irq;
750
751 dev_info(&pdev->dev, "MX1 Camera driver loaded\n");
752
753 return 0;
754
755 exit_free_irq:
756 disable_fiq(irq);
757 mxc_set_irq_fiq(irq, 0);
758 release_fiq(&fh);
759 exit_free_dma:
760 imx_dma_free(pcdev->dma_chan);
761 exit_iounmap:
762 iounmap(base);
763 exit_release:
764 release_mem_region(res->start, resource_size(res));
765 exit_kfree:
766 kfree(pcdev);
767 exit_put_clk:
768 clk_put(clk);
769 exit:
770 return err;
771 }
772
773 static int __exit mx1_camera_remove(struct platform_device *pdev)
774 {
775 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
776 struct mx1_camera_dev *pcdev = container_of(soc_host,
777 struct mx1_camera_dev, soc_host);
778 struct resource *res;
779
780 imx_dma_free(pcdev->dma_chan);
781 disable_fiq(pcdev->irq);
782 mxc_set_irq_fiq(pcdev->irq, 0);
783 release_fiq(&fh);
784
785 clk_put(pcdev->clk);
786
787 soc_camera_host_unregister(soc_host);
788
789 iounmap(pcdev->base);
790
791 res = pcdev->res;
792 release_mem_region(res->start, resource_size(res));
793
794 kfree(pcdev);
795
796 dev_info(&pdev->dev, "MX1 Camera driver unloaded\n");
797
798 return 0;
799 }
800
801 static struct platform_driver mx1_camera_driver = {
802 .driver = {
803 .name = DRIVER_NAME,
804 },
805 .remove = __exit_p(mx1_camera_remove),
806 };
807
808 static int __init mx1_camera_init(void)
809 {
810 return platform_driver_probe(&mx1_camera_driver, mx1_camera_probe);
811 }
812
813 static void __exit mx1_camera_exit(void)
814 {
815 return platform_driver_unregister(&mx1_camera_driver);
816 }
817
818 module_init(mx1_camera_init);
819 module_exit(mx1_camera_exit);
820
821 MODULE_DESCRIPTION("i.MX1/i.MXL SoC Camera Host driver");
822 MODULE_AUTHOR("Paulius Zaleckas <paulius.zaleckas@teltonika.lt>");
823 MODULE_LICENSE("GPL v2");
824 MODULE_ALIAS("platform:" DRIVER_NAME);
Linux for Ginger Game Console