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Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6
[linux-btrfs-devel.git] / drivers / media / video / omap1_camera.c
blob8a947e603aca0008e5c97a3396552d4e5316b899
1 /*
2 * V4L2 SoC Camera driver for OMAP1 Camera Interface
3 *
4 * Copyright (C) 2010, Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
5 *
6 * Based on V4L2 Driver for i.MXL/i.MXL camera (CSI) host
7 * Copyright (C) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
8 * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
9 *
10 * Based on PXA SoC camera driver
11 * Copyright (C) 2006, Sascha Hauer, Pengutronix
12 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
13 *
14 * Hardware specific bits initialy based on former work by Matt Callow
15 * drivers/media/video/omap/omap1510cam.c
16 * Copyright (C) 2006 Matt Callow
17 *
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
21 */
22
23
24 #include <linux/clk.h>
25 #include <linux/dma-mapping.h>
26 #include <linux/interrupt.h>
27 #include <linux/platform_device.h>
28 #include <linux/slab.h>
29
30 #include <media/omap1_camera.h>
31 #include <media/soc_camera.h>
32 #include <media/soc_mediabus.h>
33 #include <media/videobuf-dma-contig.h>
34 #include <media/videobuf-dma-sg.h>
35
36 #include <plat/dma.h>
37
38
39 #define DRIVER_NAME "omap1-camera"
40 #define DRIVER_VERSION "0.0.2"
41
42
43 /*
44 * ---------------------------------------------------------------------------
45 * OMAP1 Camera Interface registers
46 * ---------------------------------------------------------------------------
47 */
48
49 #define REG_CTRLCLOCK 0x00
50 #define REG_IT_STATUS 0x04
51 #define REG_MODE 0x08
52 #define REG_STATUS 0x0C
53 #define REG_CAMDATA 0x10
54 #define REG_GPIO 0x14
55 #define REG_PEAK_COUNTER 0x18
56
57 /* CTRLCLOCK bit shifts */
58 #define LCLK_EN BIT(7)
59 #define DPLL_EN BIT(6)
60 #define MCLK_EN BIT(5)
61 #define CAMEXCLK_EN BIT(4)
62 #define POLCLK BIT(3)
63 #define FOSCMOD_SHIFT 0
64 #define FOSCMOD_MASK (0x7 << FOSCMOD_SHIFT)
65 #define FOSCMOD_12MHz 0x0
66 #define FOSCMOD_6MHz 0x2
67 #define FOSCMOD_9_6MHz 0x4
68 #define FOSCMOD_24MHz 0x5
69 #define FOSCMOD_8MHz 0x6
70
71 /* IT_STATUS bit shifts */
72 #define DATA_TRANSFER BIT(5)
73 #define FIFO_FULL BIT(4)
74 #define H_DOWN BIT(3)
75 #define H_UP BIT(2)
76 #define V_DOWN BIT(1)
77 #define V_UP BIT(0)
78
79 /* MODE bit shifts */
80 #define RAZ_FIFO BIT(18)
81 #define EN_FIFO_FULL BIT(17)
82 #define EN_NIRQ BIT(16)
83 #define THRESHOLD_SHIFT 9
84 #define THRESHOLD_MASK (0x7f << THRESHOLD_SHIFT)
85 #define DMA BIT(8)
86 #define EN_H_DOWN BIT(7)
87 #define EN_H_UP BIT(6)
88 #define EN_V_DOWN BIT(5)
89 #define EN_V_UP BIT(4)
90 #define ORDERCAMD BIT(3)
91
92 #define IRQ_MASK (EN_V_UP | EN_V_DOWN | EN_H_UP | EN_H_DOWN | \
93 EN_NIRQ | EN_FIFO_FULL)
94
95 /* STATUS bit shifts */
96 #define HSTATUS BIT(1)
97 #define VSTATUS BIT(0)
98
99 /* GPIO bit shifts */
100 #define CAM_RST BIT(0)
101
102 /* end of OMAP1 Camera Interface registers */
103
104
105 #define SOCAM_BUS_FLAGS (SOCAM_MASTER | \
106 SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_HIGH | \
107 SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING | \
108 SOCAM_DATA_ACTIVE_HIGH | SOCAM_DATAWIDTH_8)
109
110
111 #define FIFO_SIZE ((THRESHOLD_MASK >> THRESHOLD_SHIFT) + 1)
112 #define FIFO_SHIFT __fls(FIFO_SIZE)
113
114 #define DMA_BURST_SHIFT (1 + OMAP_DMA_DATA_BURST_4)
115 #define DMA_BURST_SIZE (1 << DMA_BURST_SHIFT)
116
117 #define DMA_ELEMENT_SHIFT OMAP_DMA_DATA_TYPE_S32
118 #define DMA_ELEMENT_SIZE (1 << DMA_ELEMENT_SHIFT)
119
120 #define DMA_FRAME_SHIFT_CONTIG (FIFO_SHIFT - 1)
121 #define DMA_FRAME_SHIFT_SG DMA_BURST_SHIFT
122
123 #define DMA_FRAME_SHIFT(x) ((x) == OMAP1_CAM_DMA_CONTIG ? \
124 DMA_FRAME_SHIFT_CONTIG : \
125 DMA_FRAME_SHIFT_SG)
126 #define DMA_FRAME_SIZE(x) (1 << DMA_FRAME_SHIFT(x))
127 #define DMA_SYNC OMAP_DMA_SYNC_FRAME
128 #define THRESHOLD_LEVEL DMA_FRAME_SIZE
129
130
131 #define MAX_VIDEO_MEM 4 /* arbitrary video memory limit in MB */
132
133
134 /*
135 * Structures
136 */
137
138 /* buffer for one video frame */
139 struct omap1_cam_buf {
140 struct videobuf_buffer vb;
141 enum v4l2_mbus_pixelcode code;
142 int inwork;
143 struct scatterlist *sgbuf;
144 int sgcount;
145 int bytes_left;
146 enum videobuf_state result;
147 };
148
149 struct omap1_cam_dev {
150 struct soc_camera_host soc_host;
151 struct soc_camera_device *icd;
152 struct clk *clk;
153
154 unsigned int irq;
155 void __iomem *base;
156
157 int dma_ch;
158
159 struct omap1_cam_platform_data *pdata;
160 struct resource *res;
161 unsigned long pflags;
162 unsigned long camexclk;
163
164 struct list_head capture;
165
166 /* lock used to protect videobuf */
167 spinlock_t lock;
168
169 /* Pointers to DMA buffers */
170 struct omap1_cam_buf *active;
171 struct omap1_cam_buf *ready;
172
173 enum omap1_cam_vb_mode vb_mode;
174 int (*mmap_mapper)(struct videobuf_queue *q,
175 struct videobuf_buffer *buf,
176 struct vm_area_struct *vma);
177
178 u32 reg_cache[0];
179 };
180
181
182 static void cam_write(struct omap1_cam_dev *pcdev, u16 reg, u32 val)
183 {
184 pcdev->reg_cache[reg / sizeof(u32)] = val;
185 __raw_writel(val, pcdev->base + reg);
186 }
187
188 static u32 cam_read(struct omap1_cam_dev *pcdev, u16 reg, bool from_cache)
189 {
190 return !from_cache ? __raw_readl(pcdev->base + reg) :
191 pcdev->reg_cache[reg / sizeof(u32)];
192 }
193
194 #define CAM_READ(pcdev, reg) \
195 cam_read(pcdev, REG_##reg, false)
196 #define CAM_WRITE(pcdev, reg, val) \
197 cam_write(pcdev, REG_##reg, val)
198 #define CAM_READ_CACHE(pcdev, reg) \
199 cam_read(pcdev, REG_##reg, true)
200
201 /*
202 * Videobuf operations
203 */
204 static int omap1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
205 unsigned int *size)
206 {
207 struct soc_camera_device *icd = vq->priv_data;
208 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
209 icd->current_fmt->host_fmt);
210 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
211 struct omap1_cam_dev *pcdev = ici->priv;
212
213 if (bytes_per_line < 0)
214 return bytes_per_line;
215
216 *size = bytes_per_line * icd->user_height;
217
218 if (!*count || *count < OMAP1_CAMERA_MIN_BUF_COUNT(pcdev->vb_mode))
219 *count = OMAP1_CAMERA_MIN_BUF_COUNT(pcdev->vb_mode);
220
221 if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
222 *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
223
224 dev_dbg(icd->parent,
225 "%s: count=%d, size=%d\n", __func__, *count, *size);
226
227 return 0;
228 }
229
230 static void free_buffer(struct videobuf_queue *vq, struct omap1_cam_buf *buf,
231 enum omap1_cam_vb_mode vb_mode)
232 {
233 struct videobuf_buffer *vb = &buf->vb;
234
235 BUG_ON(in_interrupt());
236
237 videobuf_waiton(vq, vb, 0, 0);
238
239 if (vb_mode == OMAP1_CAM_DMA_CONTIG) {
240 videobuf_dma_contig_free(vq, vb);
241 } else {
242 struct soc_camera_device *icd = vq->priv_data;
243 struct device *dev = icd->parent;
244 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
245
246 videobuf_dma_unmap(dev, dma);
247 videobuf_dma_free(dma);
248 }
249
250 vb->state = VIDEOBUF_NEEDS_INIT;
251 }
252
253 static int omap1_videobuf_prepare(struct videobuf_queue *vq,
254 struct videobuf_buffer *vb, enum v4l2_field field)
255 {
256 struct soc_camera_device *icd = vq->priv_data;
257 struct omap1_cam_buf *buf = container_of(vb, struct omap1_cam_buf, vb);
258 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
259 icd->current_fmt->host_fmt);
260 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
261 struct omap1_cam_dev *pcdev = ici->priv;
262 int ret;
263
264 if (bytes_per_line < 0)
265 return bytes_per_line;
266
267 WARN_ON(!list_empty(&vb->queue));
268
269 BUG_ON(NULL == icd->current_fmt);
270
271 buf->inwork = 1;
272
273 if (buf->code != icd->current_fmt->code || vb->field != field ||
274 vb->width != icd->user_width ||
275 vb->height != icd->user_height) {
276 buf->code = icd->current_fmt->code;
277 vb->width = icd->user_width;
278 vb->height = icd->user_height;
279 vb->field = field;
280 vb->state = VIDEOBUF_NEEDS_INIT;
281 }
282
283 vb->size = bytes_per_line * vb->height;
284
285 if (vb->baddr && vb->bsize < vb->size) {
286 ret = -EINVAL;
287 goto out;
288 }
289
290 if (vb->state == VIDEOBUF_NEEDS_INIT) {
291 ret = videobuf_iolock(vq, vb, NULL);
292 if (ret)
293 goto fail;
294
295 vb->state = VIDEOBUF_PREPARED;
296 }
297 buf->inwork = 0;
298
299 return 0;
300 fail:
301 free_buffer(vq, buf, pcdev->vb_mode);
302 out:
303 buf->inwork = 0;
304 return ret;
305 }
306
307 static void set_dma_dest_params(int dma_ch, struct omap1_cam_buf *buf,
308 enum omap1_cam_vb_mode vb_mode)
309 {
310 dma_addr_t dma_addr;
311 unsigned int block_size;
312
313 if (vb_mode == OMAP1_CAM_DMA_CONTIG) {
314 dma_addr = videobuf_to_dma_contig(&buf->vb);
315 block_size = buf->vb.size;
316 } else {
317 if (WARN_ON(!buf->sgbuf)) {
318 buf->result = VIDEOBUF_ERROR;
319 return;
320 }
321 dma_addr = sg_dma_address(buf->sgbuf);
322 if (WARN_ON(!dma_addr)) {
323 buf->sgbuf = NULL;
324 buf->result = VIDEOBUF_ERROR;
325 return;
326 }
327 block_size = sg_dma_len(buf->sgbuf);
328 if (WARN_ON(!block_size)) {
329 buf->sgbuf = NULL;
330 buf->result = VIDEOBUF_ERROR;
331 return;
332 }
333 if (unlikely(buf->bytes_left < block_size))
334 block_size = buf->bytes_left;
335 if (WARN_ON(dma_addr & (DMA_FRAME_SIZE(vb_mode) *
336 DMA_ELEMENT_SIZE - 1))) {
337 dma_addr = ALIGN(dma_addr, DMA_FRAME_SIZE(vb_mode) *
338 DMA_ELEMENT_SIZE);
339 block_size &= ~(DMA_FRAME_SIZE(vb_mode) *
340 DMA_ELEMENT_SIZE - 1);
341 }
342 buf->bytes_left -= block_size;
343 buf->sgcount++;
344 }
345
346 omap_set_dma_dest_params(dma_ch,
347 OMAP_DMA_PORT_EMIFF, OMAP_DMA_AMODE_POST_INC, dma_addr, 0, 0);
348 omap_set_dma_transfer_params(dma_ch,
349 OMAP_DMA_DATA_TYPE_S32, DMA_FRAME_SIZE(vb_mode),
350 block_size >> (DMA_FRAME_SHIFT(vb_mode) + DMA_ELEMENT_SHIFT),
351 DMA_SYNC, 0, 0);
352 }
353
354 static struct omap1_cam_buf *prepare_next_vb(struct omap1_cam_dev *pcdev)
355 {
356 struct omap1_cam_buf *buf;
357
358 /*
359 * If there is already a buffer pointed out by the pcdev->ready,
360 * (re)use it, otherwise try to fetch and configure a new one.
361 */
362 buf = pcdev->ready;
363 if (!buf) {
364 if (list_empty(&pcdev->capture))
365 return buf;
366 buf = list_entry(pcdev->capture.next,
367 struct omap1_cam_buf, vb.queue);
368 buf->vb.state = VIDEOBUF_ACTIVE;
369 pcdev->ready = buf;
370 list_del_init(&buf->vb.queue);
371 }
372
373 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
374 /*
375 * In CONTIG mode, we can safely enter next buffer parameters
376 * into the DMA programming register set after the DMA
377 * has already been activated on the previous buffer
378 */
379 set_dma_dest_params(pcdev->dma_ch, buf, pcdev->vb_mode);
380 } else {
381 /*
382 * In SG mode, the above is not safe since there are probably
383 * a bunch of sgbufs from previous sglist still pending.
384 * Instead, mark the sglist fresh for the upcoming
385 * try_next_sgbuf().
386 */
387 buf->sgbuf = NULL;
388 }
389
390 return buf;
391 }
392
393 static struct scatterlist *try_next_sgbuf(int dma_ch, struct omap1_cam_buf *buf)
394 {
395 struct scatterlist *sgbuf;
396
397 if (likely(buf->sgbuf)) {
398 /* current sglist is active */
399 if (unlikely(!buf->bytes_left)) {
400 /* indicate sglist complete */
401 sgbuf = NULL;
402 } else {
403 /* process next sgbuf */
404 sgbuf = sg_next(buf->sgbuf);
405 if (WARN_ON(!sgbuf)) {
406 buf->result = VIDEOBUF_ERROR;
407 } else if (WARN_ON(!sg_dma_len(sgbuf))) {
408 sgbuf = NULL;
409 buf->result = VIDEOBUF_ERROR;
410 }
411 }
412 buf->sgbuf = sgbuf;
413 } else {
414 /* sglist is fresh, initialize it before using */
415 struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
416
417 sgbuf = dma->sglist;
418 if (!(WARN_ON(!sgbuf))) {
419 buf->sgbuf = sgbuf;
420 buf->sgcount = 0;
421 buf->bytes_left = buf->vb.size;
422 buf->result = VIDEOBUF_DONE;
423 }
424 }
425 if (sgbuf)
426 /*
427 * Put our next sgbuf parameters (address, size)
428 * into the DMA programming register set.
429 */
430 set_dma_dest_params(dma_ch, buf, OMAP1_CAM_DMA_SG);
431
432 return sgbuf;
433 }
434
435 static void start_capture(struct omap1_cam_dev *pcdev)
436 {
437 struct omap1_cam_buf *buf = pcdev->active;
438 u32 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
439 u32 mode = CAM_READ_CACHE(pcdev, MODE) & ~EN_V_DOWN;
440
441 if (WARN_ON(!buf))
442 return;
443
444 /*
445 * Enable start of frame interrupt, which we will use for activating
446 * our end of frame watchdog when capture actually starts.
447 */
448 mode |= EN_V_UP;
449
450 if (unlikely(ctrlclock & LCLK_EN))
451 /* stop pixel clock before FIFO reset */
452 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
453 /* reset FIFO */
454 CAM_WRITE(pcdev, MODE, mode | RAZ_FIFO);
455
456 omap_start_dma(pcdev->dma_ch);
457
458 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
459 /*
460 * In SG mode, it's a good moment for fetching next sgbuf
461 * from the current sglist and, if available, already putting
462 * its parameters into the DMA programming register set.
463 */
464 try_next_sgbuf(pcdev->dma_ch, buf);
465 }
466
467 /* (re)enable pixel clock */
468 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock | LCLK_EN);
469 /* release FIFO reset */
470 CAM_WRITE(pcdev, MODE, mode);
471 }
472
473 static void suspend_capture(struct omap1_cam_dev *pcdev)
474 {
475 u32 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
476
477 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
478 omap_stop_dma(pcdev->dma_ch);
479 }
480
481 static void disable_capture(struct omap1_cam_dev *pcdev)
482 {
483 u32 mode = CAM_READ_CACHE(pcdev, MODE);
484
485 CAM_WRITE(pcdev, MODE, mode & ~(IRQ_MASK | DMA));
486 }
487
488 static void omap1_videobuf_queue(struct videobuf_queue *vq,
489 struct videobuf_buffer *vb)
490 {
491 struct soc_camera_device *icd = vq->priv_data;
492 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
493 struct omap1_cam_dev *pcdev = ici->priv;
494 struct omap1_cam_buf *buf;
495 u32 mode;
496
497 list_add_tail(&vb->queue, &pcdev->capture);
498 vb->state = VIDEOBUF_QUEUED;
499
500 if (pcdev->active) {
501 /*
502 * Capture in progress, so don't touch pcdev->ready even if
503 * empty. Since the transfer of the DMA programming register set
504 * content to the DMA working register set is done automatically
505 * by the DMA hardware, this can pretty well happen while we
506 * are keeping the lock here. Leave fetching it from the queue
507 * to be done when a next DMA interrupt occures instead.
508 */
509 return;
510 }
511
512 WARN_ON(pcdev->ready);
513
514 buf = prepare_next_vb(pcdev);
515 if (WARN_ON(!buf))
516 return;
517
518 pcdev->active = buf;
519 pcdev->ready = NULL;
520
521 dev_dbg(icd->parent,
522 "%s: capture not active, setup FIFO, start DMA\n", __func__);
523 mode = CAM_READ_CACHE(pcdev, MODE) & ~THRESHOLD_MASK;
524 mode |= THRESHOLD_LEVEL(pcdev->vb_mode) << THRESHOLD_SHIFT;
525 CAM_WRITE(pcdev, MODE, mode | EN_FIFO_FULL | DMA);
526
527 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
528 /*
529 * In SG mode, the above prepare_next_vb() didn't actually
530 * put anything into the DMA programming register set,
531 * so we have to do it now, before activating DMA.
532 */
533 try_next_sgbuf(pcdev->dma_ch, buf);
534 }
535
536 start_capture(pcdev);
537 }
538
539 static void omap1_videobuf_release(struct videobuf_queue *vq,
540 struct videobuf_buffer *vb)
541 {
542 struct omap1_cam_buf *buf =
543 container_of(vb, struct omap1_cam_buf, vb);
544 struct soc_camera_device *icd = vq->priv_data;
545 struct device *dev = icd->parent;
546 struct soc_camera_host *ici = to_soc_camera_host(dev);
547 struct omap1_cam_dev *pcdev = ici->priv;
548
549 switch (vb->state) {
550 case VIDEOBUF_DONE:
551 dev_dbg(dev, "%s (done)\n", __func__);
552 break;
553 case VIDEOBUF_ACTIVE:
554 dev_dbg(dev, "%s (active)\n", __func__);
555 break;
556 case VIDEOBUF_QUEUED:
557 dev_dbg(dev, "%s (queued)\n", __func__);
558 break;
559 case VIDEOBUF_PREPARED:
560 dev_dbg(dev, "%s (prepared)\n", __func__);
561 break;
562 default:
563 dev_dbg(dev, "%s (unknown %d)\n", __func__, vb->state);
564 break;
565 }
566
567 free_buffer(vq, buf, pcdev->vb_mode);
568 }
569
570 static void videobuf_done(struct omap1_cam_dev *pcdev,
571 enum videobuf_state result)
572 {
573 struct omap1_cam_buf *buf = pcdev->active;
574 struct videobuf_buffer *vb;
575 struct device *dev = pcdev->icd->parent;
576
577 if (WARN_ON(!buf)) {
578 suspend_capture(pcdev);
579 disable_capture(pcdev);
580 return;
581 }
582
583 if (result == VIDEOBUF_ERROR)
584 suspend_capture(pcdev);
585
586 vb = &buf->vb;
587 if (waitqueue_active(&vb->done)) {
588 if (!pcdev->ready && result != VIDEOBUF_ERROR) {
589 /*
590 * No next buffer has been entered into the DMA
591 * programming register set on time (could be done only
592 * while the previous DMA interurpt was processed, not
593 * later), so the last DMA block, be it a whole buffer
594 * if in CONTIG or its last sgbuf if in SG mode, is
595 * about to be reused by the just autoreinitialized DMA
596 * engine, and overwritten with next frame data. Best we
597 * can do is stopping the capture as soon as possible,
598 * hopefully before the next frame start.
599 */
600 suspend_capture(pcdev);
601 }
602 vb->state = result;
603 do_gettimeofday(&vb->ts);
604 if (result != VIDEOBUF_ERROR)
605 vb->field_count++;
606 wake_up(&vb->done);
607
608 /* shift in next buffer */
609 buf = pcdev->ready;
610 pcdev->active = buf;
611 pcdev->ready = NULL;
612
613 if (!buf) {
614 /*
615 * No next buffer was ready on time (see above), so
616 * indicate error condition to force capture restart or
617 * stop, depending on next buffer already queued or not.
618 */
619 result = VIDEOBUF_ERROR;
620 prepare_next_vb(pcdev);
621
622 buf = pcdev->ready;
623 pcdev->active = buf;
624 pcdev->ready = NULL;
625 }
626 } else if (pcdev->ready) {
627 /*
628 * In both CONTIG and SG mode, the DMA engine has possibly
629 * been already autoreinitialized with the preprogrammed
630 * pcdev->ready buffer. We can either accept this fact
631 * and just swap the buffers, or provoke an error condition
632 * and restart capture. The former seems less intrusive.
633 */
634 dev_dbg(dev, "%s: nobody waiting on videobuf, swap with next\n",
635 __func__);
636 pcdev->active = pcdev->ready;
637
638 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
639 /*
640 * In SG mode, we have to make sure that the buffer we
641 * are putting back into the pcdev->ready is marked
642 * fresh.
643 */
644 buf->sgbuf = NULL;
645 }
646 pcdev->ready = buf;
647
648 buf = pcdev->active;
649 } else {
650 /*
651 * No next buffer has been entered into
652 * the DMA programming register set on time.
653 */
654 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
655 /*
656 * In CONTIG mode, the DMA engine has already been
657 * reinitialized with the current buffer. Best we can do
658 * is not touching it.
659 */
660 dev_dbg(dev,
661 "%s: nobody waiting on videobuf, reuse it\n",
662 __func__);
663 } else {
664 /*
665 * In SG mode, the DMA engine has just been
666 * autoreinitialized with the last sgbuf from the
667 * current list. Restart capture in order to transfer
668 * next frame start into the first sgbuf, not the last
669 * one.
670 */
671 if (result != VIDEOBUF_ERROR) {
672 suspend_capture(pcdev);
673 result = VIDEOBUF_ERROR;
674 }
675 }
676 }
677
678 if (!buf) {
679 dev_dbg(dev, "%s: no more videobufs, stop capture\n", __func__);
680 disable_capture(pcdev);
681 return;
682 }
683
684 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
685 /*
686 * In CONTIG mode, the current buffer parameters had already
687 * been entered into the DMA programming register set while the
688 * buffer was fetched with prepare_next_vb(), they may have also
689 * been transferred into the runtime set and already active if
690 * the DMA still running.
691 */
692 } else {
693 /* In SG mode, extra steps are required */
694 if (result == VIDEOBUF_ERROR)
695 /* make sure we (re)use sglist from start on error */
696 buf->sgbuf = NULL;
697
698 /*
699 * In any case, enter the next sgbuf parameters into the DMA
700 * programming register set. They will be used either during
701 * nearest DMA autoreinitialization or, in case of an error,
702 * on DMA startup below.
703 */
704 try_next_sgbuf(pcdev->dma_ch, buf);
705 }
706
707 if (result == VIDEOBUF_ERROR) {
708 dev_dbg(dev, "%s: videobuf error; reset FIFO, restart DMA\n",
709 __func__);
710 start_capture(pcdev);
711 /*
712 * In SG mode, the above also resulted in the next sgbuf
713 * parameters being entered into the DMA programming register
714 * set, making them ready for next DMA autoreinitialization.
715 */
716 }
717
718 /*
719 * Finally, try fetching next buffer.
720 * In CONTIG mode, it will also enter it into the DMA programming
721 * register set, making it ready for next DMA autoreinitialization.
722 */
723 prepare_next_vb(pcdev);
724 }
725
726 static void dma_isr(int channel, unsigned short status, void *data)
727 {
728 struct omap1_cam_dev *pcdev = data;
729 struct omap1_cam_buf *buf = pcdev->active;
730 unsigned long flags;
731
732 spin_lock_irqsave(&pcdev->lock, flags);
733
734 if (WARN_ON(!buf)) {
735 suspend_capture(pcdev);
736 disable_capture(pcdev);
737 goto out;
738 }
739
740 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
741 /*
742 * In CONTIG mode, assume we have just managed to collect the
743 * whole frame, hopefully before our end of frame watchdog is
744 * triggered. Then, all we have to do is disabling the watchdog
745 * for this frame, and calling videobuf_done() with success
746 * indicated.
747 */
748 CAM_WRITE(pcdev, MODE,
749 CAM_READ_CACHE(pcdev, MODE) & ~EN_V_DOWN);
750 videobuf_done(pcdev, VIDEOBUF_DONE);
751 } else {
752 /*
753 * In SG mode, we have to process every sgbuf from the current
754 * sglist, one after another.
755 */
756 if (buf->sgbuf) {
757 /*
758 * Current sglist not completed yet, try fetching next
759 * sgbuf, hopefully putting it into the DMA programming
760 * register set, making it ready for next DMA
761 * autoreinitialization.
762 */
763 try_next_sgbuf(pcdev->dma_ch, buf);
764 if (buf->sgbuf)
765 goto out;
766
767 /*
768 * No more sgbufs left in the current sglist. This
769 * doesn't mean that the whole videobuffer is already
770 * complete, but only that the last sgbuf from the
771 * current sglist is about to be filled. It will be
772 * ready on next DMA interrupt, signalled with the
773 * buf->sgbuf set back to NULL.
774 */
775 if (buf->result != VIDEOBUF_ERROR) {
776 /*
777 * Video frame collected without errors so far,
778 * we can prepare for collecting a next one
779 * as soon as DMA gets autoreinitialized
780 * after the current (last) sgbuf is completed.
781 */
782 buf = prepare_next_vb(pcdev);
783 if (!buf)
784 goto out;
785
786 try_next_sgbuf(pcdev->dma_ch, buf);
787 goto out;
788 }
789 }
790 /* end of videobuf */
791 videobuf_done(pcdev, buf->result);
792 }
793
794 out:
795 spin_unlock_irqrestore(&pcdev->lock, flags);
796 }
797
798 static irqreturn_t cam_isr(int irq, void *data)
799 {
800 struct omap1_cam_dev *pcdev = data;
801 struct device *dev = pcdev->icd->parent;
802 struct omap1_cam_buf *buf = pcdev->active;
803 u32 it_status;
804 unsigned long flags;
805
806 it_status = CAM_READ(pcdev, IT_STATUS);
807 if (!it_status)
808 return IRQ_NONE;
809
810 spin_lock_irqsave(&pcdev->lock, flags);
811
812 if (WARN_ON(!buf)) {
813 dev_warn(dev, "%s: unhandled camera interrupt, status == %#x\n",
814 __func__, it_status);
815 suspend_capture(pcdev);
816 disable_capture(pcdev);
817 goto out;
818 }
819
820 if (unlikely(it_status & FIFO_FULL)) {
821 dev_warn(dev, "%s: FIFO overflow\n", __func__);
822
823 } else if (it_status & V_DOWN) {
824 /* end of video frame watchdog */
825 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
826 /*
827 * In CONTIG mode, the watchdog is disabled with
828 * successful DMA end of block interrupt, and reenabled
829 * on next frame start. If we get here, there is nothing
830 * to check, we must be out of sync.
831 */
832 } else {
833 if (buf->sgcount == 2) {
834 /*
835 * If exactly 2 sgbufs from the next sglist have
836 * been programmed into the DMA engine (the
837 * first one already transferred into the DMA
838 * runtime register set, the second one still
839 * in the programming set), then we are in sync.
840 */
841 goto out;
842 }
843 }
844 dev_notice(dev, "%s: unexpected end of video frame\n",
845 __func__);
846
847 } else if (it_status & V_UP) {
848 u32 mode;
849
850 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
851 /*
852 * In CONTIG mode, we need this interrupt every frame
853 * in oredr to reenable our end of frame watchdog.
854 */
855 mode = CAM_READ_CACHE(pcdev, MODE);
856 } else {
857 /*
858 * In SG mode, the below enabled end of frame watchdog
859 * is kept on permanently, so we can turn this one shot
860 * setup off.
861 */
862 mode = CAM_READ_CACHE(pcdev, MODE) & ~EN_V_UP;
863 }
864
865 if (!(mode & EN_V_DOWN)) {
866 /* (re)enable end of frame watchdog interrupt */
867 mode |= EN_V_DOWN;
868 }
869 CAM_WRITE(pcdev, MODE, mode);
870 goto out;
871
872 } else {
873 dev_warn(dev, "%s: unhandled camera interrupt, status == %#x\n",
874 __func__, it_status);
875 goto out;
876 }
877
878 videobuf_done(pcdev, VIDEOBUF_ERROR);
879 out:
880 spin_unlock_irqrestore(&pcdev->lock, flags);
881 return IRQ_HANDLED;
882 }
883
884 static struct videobuf_queue_ops omap1_videobuf_ops = {
885 .buf_setup = omap1_videobuf_setup,
886 .buf_prepare = omap1_videobuf_prepare,
887 .buf_queue = omap1_videobuf_queue,
888 .buf_release = omap1_videobuf_release,
889 };
890
891
892 /*
893 * SOC Camera host operations
894 */
895
896 static void sensor_reset(struct omap1_cam_dev *pcdev, bool reset)
897 {
898 /* apply/release camera sensor reset if requested by platform data */
899 if (pcdev->pflags & OMAP1_CAMERA_RST_HIGH)
900 CAM_WRITE(pcdev, GPIO, reset);
901 else if (pcdev->pflags & OMAP1_CAMERA_RST_LOW)
902 CAM_WRITE(pcdev, GPIO, !reset);
903 }
904
905 /*
906 * The following two functions absolutely depend on the fact, that
907 * there can be only one camera on OMAP1 camera sensor interface
908 */
909 static int omap1_cam_add_device(struct soc_camera_device *icd)
910 {
911 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
912 struct omap1_cam_dev *pcdev = ici->priv;
913 u32 ctrlclock;
914
915 if (pcdev->icd)
916 return -EBUSY;
917
918 clk_enable(pcdev->clk);
919
920 /* setup sensor clock */
921 ctrlclock = CAM_READ(pcdev, CTRLCLOCK);
922 ctrlclock &= ~(CAMEXCLK_EN | MCLK_EN | DPLL_EN);
923 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
924
925 ctrlclock &= ~FOSCMOD_MASK;
926 switch (pcdev->camexclk) {
927 case 6000000:
928 ctrlclock |= CAMEXCLK_EN | FOSCMOD_6MHz;
929 break;
930 case 8000000:
931 ctrlclock |= CAMEXCLK_EN | FOSCMOD_8MHz | DPLL_EN;
932 break;
933 case 9600000:
934 ctrlclock |= CAMEXCLK_EN | FOSCMOD_9_6MHz | DPLL_EN;
935 break;
936 case 12000000:
937 ctrlclock |= CAMEXCLK_EN | FOSCMOD_12MHz;
938 break;
939 case 24000000:
940 ctrlclock |= CAMEXCLK_EN | FOSCMOD_24MHz | DPLL_EN;
941 default:
942 break;
943 }
944 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~DPLL_EN);
945
946 /* enable internal clock */
947 ctrlclock |= MCLK_EN;
948 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
949
950 sensor_reset(pcdev, false);
951
952 pcdev->icd = icd;
953
954 dev_dbg(icd->parent, "OMAP1 Camera driver attached to camera %d\n",
955 icd->devnum);
956 return 0;
957 }
958
959 static void omap1_cam_remove_device(struct soc_camera_device *icd)
960 {
961 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
962 struct omap1_cam_dev *pcdev = ici->priv;
963 u32 ctrlclock;
964
965 BUG_ON(icd != pcdev->icd);
966
967 suspend_capture(pcdev);
968 disable_capture(pcdev);
969
970 sensor_reset(pcdev, true);
971
972 /* disable and release system clocks */
973 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
974 ctrlclock &= ~(MCLK_EN | DPLL_EN | CAMEXCLK_EN);
975 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
976
977 ctrlclock = (ctrlclock & ~FOSCMOD_MASK) | FOSCMOD_12MHz;
978 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
979 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock | MCLK_EN);
980
981 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~MCLK_EN);
982
983 clk_disable(pcdev->clk);
984
985 pcdev->icd = NULL;
986
987 dev_dbg(icd->parent,
988 "OMAP1 Camera driver detached from camera %d\n", icd->devnum);
989 }
990
991 /* Duplicate standard formats based on host capability of byte swapping */
992 static const struct soc_mbus_lookup omap1_cam_formats[] = {
993 {
994 .code = V4L2_MBUS_FMT_UYVY8_2X8,
995 .fmt = {
996 .fourcc = V4L2_PIX_FMT_YUYV,
997 .name = "YUYV",
998 .bits_per_sample = 8,
999 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1000 .order = SOC_MBUS_ORDER_BE,
1001 },
1002 }, {
1003 .code = V4L2_MBUS_FMT_VYUY8_2X8,
1004 .fmt = {
1005 .fourcc = V4L2_PIX_FMT_YVYU,
1006 .name = "YVYU",
1007 .bits_per_sample = 8,
1008 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1009 .order = SOC_MBUS_ORDER_BE,
1010 },
1011 }, {
1012 .code = V4L2_MBUS_FMT_YUYV8_2X8,
1013 .fmt = {
1014 .fourcc = V4L2_PIX_FMT_UYVY,
1015 .name = "UYVY",
1016 .bits_per_sample = 8,
1017 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1018 .order = SOC_MBUS_ORDER_BE,
1019 },
1020 }, {
1021 .code = V4L2_MBUS_FMT_YVYU8_2X8,
1022 .fmt = {
1023 .fourcc = V4L2_PIX_FMT_VYUY,
1024 .name = "VYUY",
1025 .bits_per_sample = 8,
1026 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1027 .order = SOC_MBUS_ORDER_BE,
1028 },
1029 }, {
1030 .code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE,
1031 .fmt = {
1032 .fourcc = V4L2_PIX_FMT_RGB555,
1033 .name = "RGB555",
1034 .bits_per_sample = 8,
1035 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1036 .order = SOC_MBUS_ORDER_BE,
1037 },
1038 }, {
1039 .code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE,
1040 .fmt = {
1041 .fourcc = V4L2_PIX_FMT_RGB555X,
1042 .name = "RGB555X",
1043 .bits_per_sample = 8,
1044 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1045 .order = SOC_MBUS_ORDER_BE,
1046 },
1047 }, {
1048 .code = V4L2_MBUS_FMT_RGB565_2X8_BE,
1049 .fmt = {
1050 .fourcc = V4L2_PIX_FMT_RGB565,
1051 .name = "RGB565",
1052 .bits_per_sample = 8,
1053 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1054 .order = SOC_MBUS_ORDER_BE,
1055 },
1056 }, {
1057 .code = V4L2_MBUS_FMT_RGB565_2X8_LE,
1058 .fmt = {
1059 .fourcc = V4L2_PIX_FMT_RGB565X,
1060 .name = "RGB565X",
1061 .bits_per_sample = 8,
1062 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1063 .order = SOC_MBUS_ORDER_BE,
1064 },
1065 },
1066 };
1067
1068 static int omap1_cam_get_formats(struct soc_camera_device *icd,
1069 unsigned int idx, struct soc_camera_format_xlate *xlate)
1070 {
1071 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1072 struct device *dev = icd->parent;
1073 int formats = 0, ret;
1074 enum v4l2_mbus_pixelcode code;
1075 const struct soc_mbus_pixelfmt *fmt;
1076
1077 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1078 if (ret < 0)
1079 /* No more formats */
1080 return 0;
1081
1082 fmt = soc_mbus_get_fmtdesc(code);
1083 if (!fmt) {
1084 dev_warn(dev, "%s: unsupported format code #%d: %d\n", __func__,
1085 idx, code);
1086 return 0;
1087 }
1088
1089 /* Check support for the requested bits-per-sample */
1090 if (fmt->bits_per_sample != 8)
1091 return 0;
1092
1093 switch (code) {
1094 case V4L2_MBUS_FMT_YUYV8_2X8:
1095 case V4L2_MBUS_FMT_YVYU8_2X8:
1096 case V4L2_MBUS_FMT_UYVY8_2X8:
1097 case V4L2_MBUS_FMT_VYUY8_2X8:
1098 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
1099 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE:
1100 case V4L2_MBUS_FMT_RGB565_2X8_BE:
1101 case V4L2_MBUS_FMT_RGB565_2X8_LE:
1102 formats++;
1103 if (xlate) {
1104 xlate->host_fmt = soc_mbus_find_fmtdesc(code,
1105 omap1_cam_formats,
1106 ARRAY_SIZE(omap1_cam_formats));
1107 xlate->code = code;
1108 xlate++;
1109 dev_dbg(dev,
1110 "%s: providing format %s as byte swapped code #%d\n",
1111 __func__, xlate->host_fmt->name, code);
1112 }
1113 default:
1114 if (xlate)
1115 dev_dbg(dev,
1116 "%s: providing format %s in pass-through mode\n",
1117 __func__, fmt->name);
1118 }
1119 formats++;
1120 if (xlate) {
1121 xlate->host_fmt = fmt;
1122 xlate->code = code;
1123 xlate++;
1124 }
1125
1126 return formats;
1127 }
1128
1129 static bool is_dma_aligned(s32 bytes_per_line, unsigned int height,
1130 enum omap1_cam_vb_mode vb_mode)
1131 {
1132 int size = bytes_per_line * height;
1133
1134 return IS_ALIGNED(bytes_per_line, DMA_ELEMENT_SIZE) &&
1135 IS_ALIGNED(size, DMA_FRAME_SIZE(vb_mode) * DMA_ELEMENT_SIZE);
1136 }
1137
1138 static int dma_align(int *width, int *height,
1139 const struct soc_mbus_pixelfmt *fmt,
1140 enum omap1_cam_vb_mode vb_mode, bool enlarge)
1141 {
1142 s32 bytes_per_line = soc_mbus_bytes_per_line(*width, fmt);
1143
1144 if (bytes_per_line < 0)
1145 return bytes_per_line;
1146
1147 if (!is_dma_aligned(bytes_per_line, *height, vb_mode)) {
1148 unsigned int pxalign = __fls(bytes_per_line / *width);
1149 unsigned int salign = DMA_FRAME_SHIFT(vb_mode) +
1150 DMA_ELEMENT_SHIFT - pxalign;
1151 unsigned int incr = enlarge << salign;
1152
1153 v4l_bound_align_image(width, 1, *width + incr, 0,
1154 height, 1, *height + incr, 0, salign);
1155 return 0;
1156 }
1157 return 1;
1158 }
1159
1160 #define subdev_call_with_sense(pcdev, dev, icd, sd, function, args...) \
1161 ({ \
1162 struct soc_camera_sense sense = { \
1163 .master_clock = pcdev->camexclk, \
1164 .pixel_clock_max = 0, \
1165 }; \
1166 int __ret; \
1167 \
1168 if (pcdev->pdata) \
1169 sense.pixel_clock_max = pcdev->pdata->lclk_khz_max * 1000; \
1170 icd->sense = &sense; \
1171 __ret = v4l2_subdev_call(sd, video, function, ##args); \
1172 icd->sense = NULL; \
1173 \
1174 if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) { \
1175 if (sense.pixel_clock > sense.pixel_clock_max) { \
1176 dev_err(dev, \
1177 "%s: pixel clock %lu set by the camera too high!\n", \
1178 __func__, sense.pixel_clock); \
1179 __ret = -EINVAL; \
1180 } \
1181 } \
1182 __ret; \
1183 })
1184
1185 static int set_mbus_format(struct omap1_cam_dev *pcdev, struct device *dev,
1186 struct soc_camera_device *icd, struct v4l2_subdev *sd,
1187 struct v4l2_mbus_framefmt *mf,
1188 const struct soc_camera_format_xlate *xlate)
1189 {
1190 s32 bytes_per_line;
1191 int ret = subdev_call_with_sense(pcdev, dev, icd, sd, s_mbus_fmt, mf);
1192
1193 if (ret < 0) {
1194 dev_err(dev, "%s: s_mbus_fmt failed\n", __func__);
1195 return ret;
1196 }
1197
1198 if (mf->code != xlate->code) {
1199 dev_err(dev, "%s: unexpected pixel code change\n", __func__);
1200 return -EINVAL;
1201 }
1202
1203 bytes_per_line = soc_mbus_bytes_per_line(mf->width, xlate->host_fmt);
1204 if (bytes_per_line < 0) {
1205 dev_err(dev, "%s: soc_mbus_bytes_per_line() failed\n",
1206 __func__);
1207 return bytes_per_line;
1208 }
1209
1210 if (!is_dma_aligned(bytes_per_line, mf->height, pcdev->vb_mode)) {
1211 dev_err(dev, "%s: resulting geometry %ux%u not DMA aligned\n",
1212 __func__, mf->width, mf->height);
1213 return -EINVAL;
1214 }
1215 return 0;
1216 }
1217
1218 static int omap1_cam_set_crop(struct soc_camera_device *icd,
1219 struct v4l2_crop *crop)
1220 {
1221 struct v4l2_rect *rect = &crop->c;
1222 const struct soc_camera_format_xlate *xlate = icd->current_fmt;
1223 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1224 struct device *dev = icd->parent;
1225 struct soc_camera_host *ici = to_soc_camera_host(dev);
1226 struct omap1_cam_dev *pcdev = ici->priv;
1227 struct v4l2_mbus_framefmt mf;
1228 int ret;
1229
1230 ret = subdev_call_with_sense(pcdev, dev, icd, sd, s_crop, crop);
1231 if (ret < 0) {
1232 dev_warn(dev, "%s: failed to crop to %ux%u@%u:%u\n", __func__,
1233 rect->width, rect->height, rect->left, rect->top);
1234 return ret;
1235 }
1236
1237 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1238 if (ret < 0) {
1239 dev_warn(dev, "%s: failed to fetch current format\n", __func__);
1240 return ret;
1241 }
1242
1243 ret = dma_align(&mf.width, &mf.height, xlate->host_fmt, pcdev->vb_mode,
1244 false);
1245 if (ret < 0) {
1246 dev_err(dev, "%s: failed to align %ux%u %s with DMA\n",
1247 __func__, mf.width, mf.height,
1248 xlate->host_fmt->name);
1249 return ret;
1250 }
1251
1252 if (!ret) {
1253 /* sensor returned geometry not DMA aligned, trying to fix */
1254 ret = set_mbus_format(pcdev, dev, icd, sd, &mf, xlate);
1255 if (ret < 0) {
1256 dev_err(dev, "%s: failed to set format\n", __func__);
1257 return ret;
1258 }
1259 }
1260
1261 icd->user_width = mf.width;
1262 icd->user_height = mf.height;
1263
1264 return 0;
1265 }
1266
1267 static int omap1_cam_set_fmt(struct soc_camera_device *icd,
1268 struct v4l2_format *f)
1269 {
1270 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1271 const struct soc_camera_format_xlate *xlate;
1272 struct device *dev = icd->parent;
1273 struct soc_camera_host *ici = to_soc_camera_host(dev);
1274 struct omap1_cam_dev *pcdev = ici->priv;
1275 struct v4l2_pix_format *pix = &f->fmt.pix;
1276 struct v4l2_mbus_framefmt mf;
1277 int ret;
1278
1279 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1280 if (!xlate) {
1281 dev_warn(dev, "%s: format %#x not found\n", __func__,
1282 pix->pixelformat);
1283 return -EINVAL;
1284 }
1285
1286 mf.width = pix->width;
1287 mf.height = pix->height;
1288 mf.field = pix->field;
1289 mf.colorspace = pix->colorspace;
1290 mf.code = xlate->code;
1291
1292 ret = dma_align(&mf.width, &mf.height, xlate->host_fmt, pcdev->vb_mode,
1293 true);
1294 if (ret < 0) {
1295 dev_err(dev, "%s: failed to align %ux%u %s with DMA\n",
1296 __func__, pix->width, pix->height,
1297 xlate->host_fmt->name);
1298 return ret;
1299 }
1300
1301 ret = set_mbus_format(pcdev, dev, icd, sd, &mf, xlate);
1302 if (ret < 0) {
1303 dev_err(dev, "%s: failed to set format\n", __func__);
1304 return ret;
1305 }
1306
1307 pix->width = mf.width;
1308 pix->height = mf.height;
1309 pix->field = mf.field;
1310 pix->colorspace = mf.colorspace;
1311 icd->current_fmt = xlate;
1312
1313 return 0;
1314 }
1315
1316 static int omap1_cam_try_fmt(struct soc_camera_device *icd,
1317 struct v4l2_format *f)
1318 {
1319 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1320 const struct soc_camera_format_xlate *xlate;
1321 struct v4l2_pix_format *pix = &f->fmt.pix;
1322 struct v4l2_mbus_framefmt mf;
1323 int ret;
1324 /* TODO: limit to mx1 hardware capabilities */
1325
1326 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1327 if (!xlate) {
1328 dev_warn(icd->parent, "Format %#x not found\n",
1329 pix->pixelformat);
1330 return -EINVAL;
1331 }
1332
1333 mf.width = pix->width;
1334 mf.height = pix->height;
1335 mf.field = pix->field;
1336 mf.colorspace = pix->colorspace;
1337 mf.code = xlate->code;
1338
1339 /* limit to sensor capabilities */
1340 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1341 if (ret < 0)
1342 return ret;
1343
1344 pix->width = mf.width;
1345 pix->height = mf.height;
1346 pix->field = mf.field;
1347 pix->colorspace = mf.colorspace;
1348
1349 return 0;
1350 }
1351
1352 static bool sg_mode;
1353
1354 /*
1355 * Local mmap_mapper wrapper,
1356 * used for detecting videobuf-dma-contig buffer allocation failures
1357 * and switching to videobuf-dma-sg automatically for future attempts.
1358 */
1359 static int omap1_cam_mmap_mapper(struct videobuf_queue *q,
1360 struct videobuf_buffer *buf,
1361 struct vm_area_struct *vma)
1362 {
1363 struct soc_camera_device *icd = q->priv_data;
1364 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1365 struct omap1_cam_dev *pcdev = ici->priv;
1366 int ret;
1367
1368 ret = pcdev->mmap_mapper(q, buf, vma);
1369
1370 if (ret == -ENOMEM)
1371 sg_mode = true;
1372
1373 return ret;
1374 }
1375
1376 static void omap1_cam_init_videobuf(struct videobuf_queue *q,
1377 struct soc_camera_device *icd)
1378 {
1379 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1380 struct omap1_cam_dev *pcdev = ici->priv;
1381
1382 if (!sg_mode)
1383 videobuf_queue_dma_contig_init(q, &omap1_videobuf_ops,
1384 icd->parent, &pcdev->lock,
1385 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
1386 sizeof(struct omap1_cam_buf), icd, &icd->video_lock);
1387 else
1388 videobuf_queue_sg_init(q, &omap1_videobuf_ops,
1389 icd->parent, &pcdev->lock,
1390 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
1391 sizeof(struct omap1_cam_buf), icd, &icd->video_lock);
1392
1393 /* use videobuf mode (auto)selected with the module parameter */
1394 pcdev->vb_mode = sg_mode ? OMAP1_CAM_DMA_SG : OMAP1_CAM_DMA_CONTIG;
1395
1396 /*
1397 * Ensure we substitute the videobuf-dma-contig version of the
1398 * mmap_mapper() callback with our own wrapper, used for switching
1399 * automatically to videobuf-dma-sg on buffer allocation failure.
1400 */
1401 if (!sg_mode && q->int_ops->mmap_mapper != omap1_cam_mmap_mapper) {
1402 pcdev->mmap_mapper = q->int_ops->mmap_mapper;
1403 q->int_ops->mmap_mapper = omap1_cam_mmap_mapper;
1404 }
1405 }
1406
1407 static int omap1_cam_reqbufs(struct soc_camera_device *icd,
1408 struct v4l2_requestbuffers *p)
1409 {
1410 int i;
1411
1412 /*
1413 * This is for locking debugging only. I removed spinlocks and now I
1414 * check whether .prepare is ever called on a linked buffer, or whether
1415 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1416 * it hadn't triggered
1417 */
1418 for (i = 0; i < p->count; i++) {
1419 struct omap1_cam_buf *buf = container_of(icd->vb_vidq.bufs[i],
1420 struct omap1_cam_buf, vb);
1421 buf->inwork = 0;
1422 INIT_LIST_HEAD(&buf->vb.queue);
1423 }
1424
1425 return 0;
1426 }
1427
1428 static int omap1_cam_querycap(struct soc_camera_host *ici,
1429 struct v4l2_capability *cap)
1430 {
1431 /* cap->name is set by the friendly caller:-> */
1432 strlcpy(cap->card, "OMAP1 Camera", sizeof(cap->card));
1433 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1434
1435 return 0;
1436 }
1437
1438 static int omap1_cam_set_bus_param(struct soc_camera_device *icd,
1439 __u32 pixfmt)
1440 {
1441 struct device *dev = icd->parent;
1442 struct soc_camera_host *ici = to_soc_camera_host(dev);
1443 struct omap1_cam_dev *pcdev = ici->priv;
1444 const struct soc_camera_format_xlate *xlate;
1445 const struct soc_mbus_pixelfmt *fmt;
1446 unsigned long camera_flags, common_flags;
1447 u32 ctrlclock, mode;
1448 int ret;
1449
1450 camera_flags = icd->ops->query_bus_param(icd);
1451
1452 common_flags = soc_camera_bus_param_compatible(camera_flags,
1453 SOCAM_BUS_FLAGS);
1454 if (!common_flags)
1455 return -EINVAL;
1456
1457 /* Make choices, possibly based on platform configuration */
1458 if ((common_flags & SOCAM_PCLK_SAMPLE_RISING) &&
1459 (common_flags & SOCAM_PCLK_SAMPLE_FALLING)) {
1460 if (!pcdev->pdata ||
1461 pcdev->pdata->flags & OMAP1_CAMERA_LCLK_RISING)
1462 common_flags &= ~SOCAM_PCLK_SAMPLE_FALLING;
1463 else
1464 common_flags &= ~SOCAM_PCLK_SAMPLE_RISING;
1465 }
1466
1467 ret = icd->ops->set_bus_param(icd, common_flags);
1468 if (ret < 0)
1469 return ret;
1470
1471 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
1472 if (ctrlclock & LCLK_EN)
1473 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
1474
1475 if (common_flags & SOCAM_PCLK_SAMPLE_RISING) {
1476 dev_dbg(dev, "CTRLCLOCK_REG |= POLCLK\n");
1477 ctrlclock |= POLCLK;
1478 } else {
1479 dev_dbg(dev, "CTRLCLOCK_REG &= ~POLCLK\n");
1480 ctrlclock &= ~POLCLK;
1481 }
1482 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
1483
1484 if (ctrlclock & LCLK_EN)
1485 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
1486
1487 /* select bus endianess */
1488 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1489 fmt = xlate->host_fmt;
1490
1491 mode = CAM_READ(pcdev, MODE) & ~(RAZ_FIFO | IRQ_MASK | DMA);
1492 if (fmt->order == SOC_MBUS_ORDER_LE) {
1493 dev_dbg(dev, "MODE_REG &= ~ORDERCAMD\n");
1494 CAM_WRITE(pcdev, MODE, mode & ~ORDERCAMD);
1495 } else {
1496 dev_dbg(dev, "MODE_REG |= ORDERCAMD\n");
1497 CAM_WRITE(pcdev, MODE, mode | ORDERCAMD);
1498 }
1499
1500 return 0;
1501 }
1502
1503 static unsigned int omap1_cam_poll(struct file *file, poll_table *pt)
1504 {
1505 struct soc_camera_device *icd = file->private_data;
1506 struct omap1_cam_buf *buf;
1507
1508 buf = list_entry(icd->vb_vidq.stream.next, struct omap1_cam_buf,
1509 vb.stream);
1510
1511 poll_wait(file, &buf->vb.done, pt);
1512
1513 if (buf->vb.state == VIDEOBUF_DONE ||
1514 buf->vb.state == VIDEOBUF_ERROR)
1515 return POLLIN | POLLRDNORM;
1516
1517 return 0;
1518 }
1519
1520 static struct soc_camera_host_ops omap1_host_ops = {
1521 .owner = THIS_MODULE,
1522 .add = omap1_cam_add_device,
1523 .remove = omap1_cam_remove_device,
1524 .get_formats = omap1_cam_get_formats,
1525 .set_crop = omap1_cam_set_crop,
1526 .set_fmt = omap1_cam_set_fmt,
1527 .try_fmt = omap1_cam_try_fmt,
1528 .init_videobuf = omap1_cam_init_videobuf,
1529 .reqbufs = omap1_cam_reqbufs,
1530 .querycap = omap1_cam_querycap,
1531 .set_bus_param = omap1_cam_set_bus_param,
1532 .poll = omap1_cam_poll,
1533 };
1534
1535 static int __init omap1_cam_probe(struct platform_device *pdev)
1536 {
1537 struct omap1_cam_dev *pcdev;
1538 struct resource *res;
1539 struct clk *clk;
1540 void __iomem *base;
1541 unsigned int irq;
1542 int err = 0;
1543
1544 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1545 irq = platform_get_irq(pdev, 0);
1546 if (!res || (int)irq <= 0) {
1547 err = -ENODEV;
1548 goto exit;
1549 }
1550
1551 clk = clk_get(&pdev->dev, "armper_ck");
1552 if (IS_ERR(clk)) {
1553 err = PTR_ERR(clk);
1554 goto exit;
1555 }
1556
1557 pcdev = kzalloc(sizeof(*pcdev) + resource_size(res), GFP_KERNEL);
1558 if (!pcdev) {
1559 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1560 err = -ENOMEM;
1561 goto exit_put_clk;
1562 }
1563
1564 pcdev->res = res;
1565 pcdev->clk = clk;
1566
1567 pcdev->pdata = pdev->dev.platform_data;
1568 pcdev->pflags = pcdev->pdata->flags;
1569
1570 if (pcdev->pdata)
1571 pcdev->camexclk = pcdev->pdata->camexclk_khz * 1000;
1572
1573 switch (pcdev->camexclk) {
1574 case 6000000:
1575 case 8000000:
1576 case 9600000:
1577 case 12000000:
1578 case 24000000:
1579 break;
1580 default:
1581 dev_warn(&pdev->dev,
1582 "Incorrect sensor clock frequency %ld kHz, "
1583 "should be one of 0, 6, 8, 9.6, 12 or 24 MHz, "
1584 "please correct your platform data\n",
1585 pcdev->pdata->camexclk_khz);
1586 pcdev->camexclk = 0;
1587 case 0:
1588 dev_info(&pdev->dev,
1589 "Not providing sensor clock\n");
1590 }
1591
1592 INIT_LIST_HEAD(&pcdev->capture);
1593 spin_lock_init(&pcdev->lock);
1594
1595 /*
1596 * Request the region.
1597 */
1598 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
1599 err = -EBUSY;
1600 goto exit_kfree;
1601 }
1602
1603 base = ioremap(res->start, resource_size(res));
1604 if (!base) {
1605 err = -ENOMEM;
1606 goto exit_release;
1607 }
1608 pcdev->irq = irq;
1609 pcdev->base = base;
1610
1611 sensor_reset(pcdev, true);
1612
1613 err = omap_request_dma(OMAP_DMA_CAMERA_IF_RX, DRIVER_NAME,
1614 dma_isr, (void *)pcdev, &pcdev->dma_ch);
1615 if (err < 0) {
1616 dev_err(&pdev->dev, "Can't request DMA for OMAP1 Camera\n");
1617 err = -EBUSY;
1618 goto exit_iounmap;
1619 }
1620 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_ch);
1621
1622 /* preconfigure DMA */
1623 omap_set_dma_src_params(pcdev->dma_ch, OMAP_DMA_PORT_TIPB,
1624 OMAP_DMA_AMODE_CONSTANT, res->start + REG_CAMDATA,
1625 0, 0);
1626 omap_set_dma_dest_burst_mode(pcdev->dma_ch, OMAP_DMA_DATA_BURST_4);
1627 /* setup DMA autoinitialization */
1628 omap_dma_link_lch(pcdev->dma_ch, pcdev->dma_ch);
1629
1630 err = request_irq(pcdev->irq, cam_isr, 0, DRIVER_NAME, pcdev);
1631 if (err) {
1632 dev_err(&pdev->dev, "Camera interrupt register failed\n");
1633 goto exit_free_dma;
1634 }
1635
1636 pcdev->soc_host.drv_name = DRIVER_NAME;
1637 pcdev->soc_host.ops = &omap1_host_ops;
1638 pcdev->soc_host.priv = pcdev;
1639 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
1640 pcdev->soc_host.nr = pdev->id;
1641
1642 err = soc_camera_host_register(&pcdev->soc_host);
1643 if (err)
1644 goto exit_free_irq;
1645
1646 dev_info(&pdev->dev, "OMAP1 Camera Interface driver loaded\n");
1647
1648 return 0;
1649
1650 exit_free_irq:
1651 free_irq(pcdev->irq, pcdev);
1652 exit_free_dma:
1653 omap_free_dma(pcdev->dma_ch);
1654 exit_iounmap:
1655 iounmap(base);
1656 exit_release:
1657 release_mem_region(res->start, resource_size(res));
1658 exit_kfree:
1659 kfree(pcdev);
1660 exit_put_clk:
1661 clk_put(clk);
1662 exit:
1663 return err;
1664 }
1665
1666 static int __exit omap1_cam_remove(struct platform_device *pdev)
1667 {
1668 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1669 struct omap1_cam_dev *pcdev = container_of(soc_host,
1670 struct omap1_cam_dev, soc_host);
1671 struct resource *res;
1672
1673 free_irq(pcdev->irq, pcdev);
1674
1675 omap_free_dma(pcdev->dma_ch);
1676
1677 soc_camera_host_unregister(soc_host);
1678
1679 iounmap(pcdev->base);
1680
1681 res = pcdev->res;
1682 release_mem_region(res->start, resource_size(res));
1683
1684 clk_put(pcdev->clk);
1685
1686 kfree(pcdev);
1687
1688 dev_info(&pdev->dev, "OMAP1 Camera Interface driver unloaded\n");
1689
1690 return 0;
1691 }
1692
1693 static struct platform_driver omap1_cam_driver = {
1694 .driver = {
1695 .name = DRIVER_NAME,
1696 },
1697 .probe = omap1_cam_probe,
1698 .remove = __exit_p(omap1_cam_remove),
1699 };
1700
1701 static int __init omap1_cam_init(void)
1702 {
1703 return platform_driver_register(&omap1_cam_driver);
1704 }
1705 module_init(omap1_cam_init);
1706
1707 static void __exit omap1_cam_exit(void)
1708 {
1709 platform_driver_unregister(&omap1_cam_driver);
1710 }
1711 module_exit(omap1_cam_exit);
1712
1713 module_param(sg_mode, bool, 0644);
1714 MODULE_PARM_DESC(sg_mode, "videobuf mode, 0: dma-contig (default), 1: dma-sg");
1715
1716 MODULE_DESCRIPTION("OMAP1 Camera Interface driver");
1717 MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
1718 MODULE_LICENSE("GPL v2");
1719 MODULE_LICENSE(DRIVER_VERSION);
1720 MODULE_ALIAS("platform:" DRIVER_NAME);
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