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Avoid beyond bounds copy while caching ACL
[zen-stable.git] / drivers / media / video / omap1_camera.c
blobc20f5ecd67904d634d818b734b49a8f68f5dc2a3
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/module.h>
28 #include <linux/platform_device.h>
29 #include <linux/slab.h>
30
31 #include <media/omap1_camera.h>
32 #include <media/soc_camera.h>
33 #include <media/soc_mediabus.h>
34 #include <media/videobuf-dma-contig.h>
35 #include <media/videobuf-dma-sg.h>
36
37 #include <plat/dma.h>
38
39
40 #define DRIVER_NAME "omap1-camera"
41 #define DRIVER_VERSION "0.0.2"
42
43
44 /*
45 * ---------------------------------------------------------------------------
46 * OMAP1 Camera Interface registers
47 * ---------------------------------------------------------------------------
48 */
49
50 #define REG_CTRLCLOCK 0x00
51 #define REG_IT_STATUS 0x04
52 #define REG_MODE 0x08
53 #define REG_STATUS 0x0C
54 #define REG_CAMDATA 0x10
55 #define REG_GPIO 0x14
56 #define REG_PEAK_COUNTER 0x18
57
58 /* CTRLCLOCK bit shifts */
59 #define LCLK_EN BIT(7)
60 #define DPLL_EN BIT(6)
61 #define MCLK_EN BIT(5)
62 #define CAMEXCLK_EN BIT(4)
63 #define POLCLK BIT(3)
64 #define FOSCMOD_SHIFT 0
65 #define FOSCMOD_MASK (0x7 << FOSCMOD_SHIFT)
66 #define FOSCMOD_12MHz 0x0
67 #define FOSCMOD_6MHz 0x2
68 #define FOSCMOD_9_6MHz 0x4
69 #define FOSCMOD_24MHz 0x5
70 #define FOSCMOD_8MHz 0x6
71
72 /* IT_STATUS bit shifts */
73 #define DATA_TRANSFER BIT(5)
74 #define FIFO_FULL BIT(4)
75 #define H_DOWN BIT(3)
76 #define H_UP BIT(2)
77 #define V_DOWN BIT(1)
78 #define V_UP BIT(0)
79
80 /* MODE bit shifts */
81 #define RAZ_FIFO BIT(18)
82 #define EN_FIFO_FULL BIT(17)
83 #define EN_NIRQ BIT(16)
84 #define THRESHOLD_SHIFT 9
85 #define THRESHOLD_MASK (0x7f << THRESHOLD_SHIFT)
86 #define DMA BIT(8)
87 #define EN_H_DOWN BIT(7)
88 #define EN_H_UP BIT(6)
89 #define EN_V_DOWN BIT(5)
90 #define EN_V_UP BIT(4)
91 #define ORDERCAMD BIT(3)
92
93 #define IRQ_MASK (EN_V_UP | EN_V_DOWN | EN_H_UP | EN_H_DOWN | \
94 EN_NIRQ | EN_FIFO_FULL)
95
96 /* STATUS bit shifts */
97 #define HSTATUS BIT(1)
98 #define VSTATUS BIT(0)
99
100 /* GPIO bit shifts */
101 #define CAM_RST BIT(0)
102
103 /* end of OMAP1 Camera Interface registers */
104
105
106 #define SOCAM_BUS_FLAGS (V4L2_MBUS_MASTER | \
107 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
108 V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | \
109 V4L2_MBUS_DATA_ACTIVE_HIGH)
110
111
112 #define FIFO_SIZE ((THRESHOLD_MASK >> THRESHOLD_SHIFT) + 1)
113 #define FIFO_SHIFT __fls(FIFO_SIZE)
114
115 #define DMA_BURST_SHIFT (1 + OMAP_DMA_DATA_BURST_4)
116 #define DMA_BURST_SIZE (1 << DMA_BURST_SHIFT)
117
118 #define DMA_ELEMENT_SHIFT OMAP_DMA_DATA_TYPE_S32
119 #define DMA_ELEMENT_SIZE (1 << DMA_ELEMENT_SHIFT)
120
121 #define DMA_FRAME_SHIFT_CONTIG (FIFO_SHIFT - 1)
122 #define DMA_FRAME_SHIFT_SG DMA_BURST_SHIFT
123
124 #define DMA_FRAME_SHIFT(x) ((x) == OMAP1_CAM_DMA_CONTIG ? \
125 DMA_FRAME_SHIFT_CONTIG : \
126 DMA_FRAME_SHIFT_SG)
127 #define DMA_FRAME_SIZE(x) (1 << DMA_FRAME_SHIFT(x))
128 #define DMA_SYNC OMAP_DMA_SYNC_FRAME
129 #define THRESHOLD_LEVEL DMA_FRAME_SIZE
130
131
132 #define MAX_VIDEO_MEM 4 /* arbitrary video memory limit in MB */
133
134
135 /*
136 * Structures
137 */
138
139 /* buffer for one video frame */
140 struct omap1_cam_buf {
141 struct videobuf_buffer vb;
142 enum v4l2_mbus_pixelcode code;
143 int inwork;
144 struct scatterlist *sgbuf;
145 int sgcount;
146 int bytes_left;
147 enum videobuf_state result;
148 };
149
150 struct omap1_cam_dev {
151 struct soc_camera_host soc_host;
152 struct soc_camera_device *icd;
153 struct clk *clk;
154
155 unsigned int irq;
156 void __iomem *base;
157
158 int dma_ch;
159
160 struct omap1_cam_platform_data *pdata;
161 struct resource *res;
162 unsigned long pflags;
163 unsigned long camexclk;
164
165 struct list_head capture;
166
167 /* lock used to protect videobuf */
168 spinlock_t lock;
169
170 /* Pointers to DMA buffers */
171 struct omap1_cam_buf *active;
172 struct omap1_cam_buf *ready;
173
174 enum omap1_cam_vb_mode vb_mode;
175 int (*mmap_mapper)(struct videobuf_queue *q,
176 struct videobuf_buffer *buf,
177 struct vm_area_struct *vma);
178
179 u32 reg_cache[0];
180 };
181
182
183 static void cam_write(struct omap1_cam_dev *pcdev, u16 reg, u32 val)
184 {
185 pcdev->reg_cache[reg / sizeof(u32)] = val;
186 __raw_writel(val, pcdev->base + reg);
187 }
188
189 static u32 cam_read(struct omap1_cam_dev *pcdev, u16 reg, bool from_cache)
190 {
191 return !from_cache ? __raw_readl(pcdev->base + reg) :
192 pcdev->reg_cache[reg / sizeof(u32)];
193 }
194
195 #define CAM_READ(pcdev, reg) \
196 cam_read(pcdev, REG_##reg, false)
197 #define CAM_WRITE(pcdev, reg, val) \
198 cam_write(pcdev, REG_##reg, val)
199 #define CAM_READ_CACHE(pcdev, reg) \
200 cam_read(pcdev, REG_##reg, true)
201
202 /*
203 * Videobuf operations
204 */
205 static int omap1_videobuf_setup(struct videobuf_queue *vq, unsigned int *count,
206 unsigned int *size)
207 {
208 struct soc_camera_device *icd = vq->priv_data;
209 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
210 icd->current_fmt->host_fmt);
211 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
212 struct omap1_cam_dev *pcdev = ici->priv;
213
214 if (bytes_per_line < 0)
215 return bytes_per_line;
216
217 *size = bytes_per_line * icd->user_height;
218
219 if (!*count || *count < OMAP1_CAMERA_MIN_BUF_COUNT(pcdev->vb_mode))
220 *count = OMAP1_CAMERA_MIN_BUF_COUNT(pcdev->vb_mode);
221
222 if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
223 *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
224
225 dev_dbg(icd->parent,
226 "%s: count=%d, size=%d\n", __func__, *count, *size);
227
228 return 0;
229 }
230
231 static void free_buffer(struct videobuf_queue *vq, struct omap1_cam_buf *buf,
232 enum omap1_cam_vb_mode vb_mode)
233 {
234 struct videobuf_buffer *vb = &buf->vb;
235
236 BUG_ON(in_interrupt());
237
238 videobuf_waiton(vq, vb, 0, 0);
239
240 if (vb_mode == OMAP1_CAM_DMA_CONTIG) {
241 videobuf_dma_contig_free(vq, vb);
242 } else {
243 struct soc_camera_device *icd = vq->priv_data;
244 struct device *dev = icd->parent;
245 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
246
247 videobuf_dma_unmap(dev, dma);
248 videobuf_dma_free(dma);
249 }
250
251 vb->state = VIDEOBUF_NEEDS_INIT;
252 }
253
254 static int omap1_videobuf_prepare(struct videobuf_queue *vq,
255 struct videobuf_buffer *vb, enum v4l2_field field)
256 {
257 struct soc_camera_device *icd = vq->priv_data;
258 struct omap1_cam_buf *buf = container_of(vb, struct omap1_cam_buf, vb);
259 int bytes_per_line = soc_mbus_bytes_per_line(icd->user_width,
260 icd->current_fmt->host_fmt);
261 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
262 struct omap1_cam_dev *pcdev = ici->priv;
263 int ret;
264
265 if (bytes_per_line < 0)
266 return bytes_per_line;
267
268 WARN_ON(!list_empty(&vb->queue));
269
270 BUG_ON(NULL == icd->current_fmt);
271
272 buf->inwork = 1;
273
274 if (buf->code != icd->current_fmt->code || vb->field != field ||
275 vb->width != icd->user_width ||
276 vb->height != icd->user_height) {
277 buf->code = icd->current_fmt->code;
278 vb->width = icd->user_width;
279 vb->height = icd->user_height;
280 vb->field = field;
281 vb->state = VIDEOBUF_NEEDS_INIT;
282 }
283
284 vb->size = bytes_per_line * vb->height;
285
286 if (vb->baddr && vb->bsize < vb->size) {
287 ret = -EINVAL;
288 goto out;
289 }
290
291 if (vb->state == VIDEOBUF_NEEDS_INIT) {
292 ret = videobuf_iolock(vq, vb, NULL);
293 if (ret)
294 goto fail;
295
296 vb->state = VIDEOBUF_PREPARED;
297 }
298 buf->inwork = 0;
299
300 return 0;
301 fail:
302 free_buffer(vq, buf, pcdev->vb_mode);
303 out:
304 buf->inwork = 0;
305 return ret;
306 }
307
308 static void set_dma_dest_params(int dma_ch, struct omap1_cam_buf *buf,
309 enum omap1_cam_vb_mode vb_mode)
310 {
311 dma_addr_t dma_addr;
312 unsigned int block_size;
313
314 if (vb_mode == OMAP1_CAM_DMA_CONTIG) {
315 dma_addr = videobuf_to_dma_contig(&buf->vb);
316 block_size = buf->vb.size;
317 } else {
318 if (WARN_ON(!buf->sgbuf)) {
319 buf->result = VIDEOBUF_ERROR;
320 return;
321 }
322 dma_addr = sg_dma_address(buf->sgbuf);
323 if (WARN_ON(!dma_addr)) {
324 buf->sgbuf = NULL;
325 buf->result = VIDEOBUF_ERROR;
326 return;
327 }
328 block_size = sg_dma_len(buf->sgbuf);
329 if (WARN_ON(!block_size)) {
330 buf->sgbuf = NULL;
331 buf->result = VIDEOBUF_ERROR;
332 return;
333 }
334 if (unlikely(buf->bytes_left < block_size))
335 block_size = buf->bytes_left;
336 if (WARN_ON(dma_addr & (DMA_FRAME_SIZE(vb_mode) *
337 DMA_ELEMENT_SIZE - 1))) {
338 dma_addr = ALIGN(dma_addr, DMA_FRAME_SIZE(vb_mode) *
339 DMA_ELEMENT_SIZE);
340 block_size &= ~(DMA_FRAME_SIZE(vb_mode) *
341 DMA_ELEMENT_SIZE - 1);
342 }
343 buf->bytes_left -= block_size;
344 buf->sgcount++;
345 }
346
347 omap_set_dma_dest_params(dma_ch,
348 OMAP_DMA_PORT_EMIFF, OMAP_DMA_AMODE_POST_INC, dma_addr, 0, 0);
349 omap_set_dma_transfer_params(dma_ch,
350 OMAP_DMA_DATA_TYPE_S32, DMA_FRAME_SIZE(vb_mode),
351 block_size >> (DMA_FRAME_SHIFT(vb_mode) + DMA_ELEMENT_SHIFT),
352 DMA_SYNC, 0, 0);
353 }
354
355 static struct omap1_cam_buf *prepare_next_vb(struct omap1_cam_dev *pcdev)
356 {
357 struct omap1_cam_buf *buf;
358
359 /*
360 * If there is already a buffer pointed out by the pcdev->ready,
361 * (re)use it, otherwise try to fetch and configure a new one.
362 */
363 buf = pcdev->ready;
364 if (!buf) {
365 if (list_empty(&pcdev->capture))
366 return buf;
367 buf = list_entry(pcdev->capture.next,
368 struct omap1_cam_buf, vb.queue);
369 buf->vb.state = VIDEOBUF_ACTIVE;
370 pcdev->ready = buf;
371 list_del_init(&buf->vb.queue);
372 }
373
374 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
375 /*
376 * In CONTIG mode, we can safely enter next buffer parameters
377 * into the DMA programming register set after the DMA
378 * has already been activated on the previous buffer
379 */
380 set_dma_dest_params(pcdev->dma_ch, buf, pcdev->vb_mode);
381 } else {
382 /*
383 * In SG mode, the above is not safe since there are probably
384 * a bunch of sgbufs from previous sglist still pending.
385 * Instead, mark the sglist fresh for the upcoming
386 * try_next_sgbuf().
387 */
388 buf->sgbuf = NULL;
389 }
390
391 return buf;
392 }
393
394 static struct scatterlist *try_next_sgbuf(int dma_ch, struct omap1_cam_buf *buf)
395 {
396 struct scatterlist *sgbuf;
397
398 if (likely(buf->sgbuf)) {
399 /* current sglist is active */
400 if (unlikely(!buf->bytes_left)) {
401 /* indicate sglist complete */
402 sgbuf = NULL;
403 } else {
404 /* process next sgbuf */
405 sgbuf = sg_next(buf->sgbuf);
406 if (WARN_ON(!sgbuf)) {
407 buf->result = VIDEOBUF_ERROR;
408 } else if (WARN_ON(!sg_dma_len(sgbuf))) {
409 sgbuf = NULL;
410 buf->result = VIDEOBUF_ERROR;
411 }
412 }
413 buf->sgbuf = sgbuf;
414 } else {
415 /* sglist is fresh, initialize it before using */
416 struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
417
418 sgbuf = dma->sglist;
419 if (!(WARN_ON(!sgbuf))) {
420 buf->sgbuf = sgbuf;
421 buf->sgcount = 0;
422 buf->bytes_left = buf->vb.size;
423 buf->result = VIDEOBUF_DONE;
424 }
425 }
426 if (sgbuf)
427 /*
428 * Put our next sgbuf parameters (address, size)
429 * into the DMA programming register set.
430 */
431 set_dma_dest_params(dma_ch, buf, OMAP1_CAM_DMA_SG);
432
433 return sgbuf;
434 }
435
436 static void start_capture(struct omap1_cam_dev *pcdev)
437 {
438 struct omap1_cam_buf *buf = pcdev->active;
439 u32 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
440 u32 mode = CAM_READ_CACHE(pcdev, MODE) & ~EN_V_DOWN;
441
442 if (WARN_ON(!buf))
443 return;
444
445 /*
446 * Enable start of frame interrupt, which we will use for activating
447 * our end of frame watchdog when capture actually starts.
448 */
449 mode |= EN_V_UP;
450
451 if (unlikely(ctrlclock & LCLK_EN))
452 /* stop pixel clock before FIFO reset */
453 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
454 /* reset FIFO */
455 CAM_WRITE(pcdev, MODE, mode | RAZ_FIFO);
456
457 omap_start_dma(pcdev->dma_ch);
458
459 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
460 /*
461 * In SG mode, it's a good moment for fetching next sgbuf
462 * from the current sglist and, if available, already putting
463 * its parameters into the DMA programming register set.
464 */
465 try_next_sgbuf(pcdev->dma_ch, buf);
466 }
467
468 /* (re)enable pixel clock */
469 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock | LCLK_EN);
470 /* release FIFO reset */
471 CAM_WRITE(pcdev, MODE, mode);
472 }
473
474 static void suspend_capture(struct omap1_cam_dev *pcdev)
475 {
476 u32 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
477
478 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
479 omap_stop_dma(pcdev->dma_ch);
480 }
481
482 static void disable_capture(struct omap1_cam_dev *pcdev)
483 {
484 u32 mode = CAM_READ_CACHE(pcdev, MODE);
485
486 CAM_WRITE(pcdev, MODE, mode & ~(IRQ_MASK | DMA));
487 }
488
489 static void omap1_videobuf_queue(struct videobuf_queue *vq,
490 struct videobuf_buffer *vb)
491 {
492 struct soc_camera_device *icd = vq->priv_data;
493 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
494 struct omap1_cam_dev *pcdev = ici->priv;
495 struct omap1_cam_buf *buf;
496 u32 mode;
497
498 list_add_tail(&vb->queue, &pcdev->capture);
499 vb->state = VIDEOBUF_QUEUED;
500
501 if (pcdev->active) {
502 /*
503 * Capture in progress, so don't touch pcdev->ready even if
504 * empty. Since the transfer of the DMA programming register set
505 * content to the DMA working register set is done automatically
506 * by the DMA hardware, this can pretty well happen while we
507 * are keeping the lock here. Leave fetching it from the queue
508 * to be done when a next DMA interrupt occures instead.
509 */
510 return;
511 }
512
513 WARN_ON(pcdev->ready);
514
515 buf = prepare_next_vb(pcdev);
516 if (WARN_ON(!buf))
517 return;
518
519 pcdev->active = buf;
520 pcdev->ready = NULL;
521
522 dev_dbg(icd->parent,
523 "%s: capture not active, setup FIFO, start DMA\n", __func__);
524 mode = CAM_READ_CACHE(pcdev, MODE) & ~THRESHOLD_MASK;
525 mode |= THRESHOLD_LEVEL(pcdev->vb_mode) << THRESHOLD_SHIFT;
526 CAM_WRITE(pcdev, MODE, mode | EN_FIFO_FULL | DMA);
527
528 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
529 /*
530 * In SG mode, the above prepare_next_vb() didn't actually
531 * put anything into the DMA programming register set,
532 * so we have to do it now, before activating DMA.
533 */
534 try_next_sgbuf(pcdev->dma_ch, buf);
535 }
536
537 start_capture(pcdev);
538 }
539
540 static void omap1_videobuf_release(struct videobuf_queue *vq,
541 struct videobuf_buffer *vb)
542 {
543 struct omap1_cam_buf *buf =
544 container_of(vb, struct omap1_cam_buf, vb);
545 struct soc_camera_device *icd = vq->priv_data;
546 struct device *dev = icd->parent;
547 struct soc_camera_host *ici = to_soc_camera_host(dev);
548 struct omap1_cam_dev *pcdev = ici->priv;
549
550 switch (vb->state) {
551 case VIDEOBUF_DONE:
552 dev_dbg(dev, "%s (done)\n", __func__);
553 break;
554 case VIDEOBUF_ACTIVE:
555 dev_dbg(dev, "%s (active)\n", __func__);
556 break;
557 case VIDEOBUF_QUEUED:
558 dev_dbg(dev, "%s (queued)\n", __func__);
559 break;
560 case VIDEOBUF_PREPARED:
561 dev_dbg(dev, "%s (prepared)\n", __func__);
562 break;
563 default:
564 dev_dbg(dev, "%s (unknown %d)\n", __func__, vb->state);
565 break;
566 }
567
568 free_buffer(vq, buf, pcdev->vb_mode);
569 }
570
571 static void videobuf_done(struct omap1_cam_dev *pcdev,
572 enum videobuf_state result)
573 {
574 struct omap1_cam_buf *buf = pcdev->active;
575 struct videobuf_buffer *vb;
576 struct device *dev = pcdev->icd->parent;
577
578 if (WARN_ON(!buf)) {
579 suspend_capture(pcdev);
580 disable_capture(pcdev);
581 return;
582 }
583
584 if (result == VIDEOBUF_ERROR)
585 suspend_capture(pcdev);
586
587 vb = &buf->vb;
588 if (waitqueue_active(&vb->done)) {
589 if (!pcdev->ready && result != VIDEOBUF_ERROR) {
590 /*
591 * No next buffer has been entered into the DMA
592 * programming register set on time (could be done only
593 * while the previous DMA interurpt was processed, not
594 * later), so the last DMA block, be it a whole buffer
595 * if in CONTIG or its last sgbuf if in SG mode, is
596 * about to be reused by the just autoreinitialized DMA
597 * engine, and overwritten with next frame data. Best we
598 * can do is stopping the capture as soon as possible,
599 * hopefully before the next frame start.
600 */
601 suspend_capture(pcdev);
602 }
603 vb->state = result;
604 do_gettimeofday(&vb->ts);
605 if (result != VIDEOBUF_ERROR)
606 vb->field_count++;
607 wake_up(&vb->done);
608
609 /* shift in next buffer */
610 buf = pcdev->ready;
611 pcdev->active = buf;
612 pcdev->ready = NULL;
613
614 if (!buf) {
615 /*
616 * No next buffer was ready on time (see above), so
617 * indicate error condition to force capture restart or
618 * stop, depending on next buffer already queued or not.
619 */
620 result = VIDEOBUF_ERROR;
621 prepare_next_vb(pcdev);
622
623 buf = pcdev->ready;
624 pcdev->active = buf;
625 pcdev->ready = NULL;
626 }
627 } else if (pcdev->ready) {
628 /*
629 * In both CONTIG and SG mode, the DMA engine has possibly
630 * been already autoreinitialized with the preprogrammed
631 * pcdev->ready buffer. We can either accept this fact
632 * and just swap the buffers, or provoke an error condition
633 * and restart capture. The former seems less intrusive.
634 */
635 dev_dbg(dev, "%s: nobody waiting on videobuf, swap with next\n",
636 __func__);
637 pcdev->active = pcdev->ready;
638
639 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
640 /*
641 * In SG mode, we have to make sure that the buffer we
642 * are putting back into the pcdev->ready is marked
643 * fresh.
644 */
645 buf->sgbuf = NULL;
646 }
647 pcdev->ready = buf;
648
649 buf = pcdev->active;
650 } else {
651 /*
652 * No next buffer has been entered into
653 * the DMA programming register set on time.
654 */
655 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
656 /*
657 * In CONTIG mode, the DMA engine has already been
658 * reinitialized with the current buffer. Best we can do
659 * is not touching it.
660 */
661 dev_dbg(dev,
662 "%s: nobody waiting on videobuf, reuse it\n",
663 __func__);
664 } else {
665 /*
666 * In SG mode, the DMA engine has just been
667 * autoreinitialized with the last sgbuf from the
668 * current list. Restart capture in order to transfer
669 * next frame start into the first sgbuf, not the last
670 * one.
671 */
672 if (result != VIDEOBUF_ERROR) {
673 suspend_capture(pcdev);
674 result = VIDEOBUF_ERROR;
675 }
676 }
677 }
678
679 if (!buf) {
680 dev_dbg(dev, "%s: no more videobufs, stop capture\n", __func__);
681 disable_capture(pcdev);
682 return;
683 }
684
685 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
686 /*
687 * In CONTIG mode, the current buffer parameters had already
688 * been entered into the DMA programming register set while the
689 * buffer was fetched with prepare_next_vb(), they may have also
690 * been transferred into the runtime set and already active if
691 * the DMA still running.
692 */
693 } else {
694 /* In SG mode, extra steps are required */
695 if (result == VIDEOBUF_ERROR)
696 /* make sure we (re)use sglist from start on error */
697 buf->sgbuf = NULL;
698
699 /*
700 * In any case, enter the next sgbuf parameters into the DMA
701 * programming register set. They will be used either during
702 * nearest DMA autoreinitialization or, in case of an error,
703 * on DMA startup below.
704 */
705 try_next_sgbuf(pcdev->dma_ch, buf);
706 }
707
708 if (result == VIDEOBUF_ERROR) {
709 dev_dbg(dev, "%s: videobuf error; reset FIFO, restart DMA\n",
710 __func__);
711 start_capture(pcdev);
712 /*
713 * In SG mode, the above also resulted in the next sgbuf
714 * parameters being entered into the DMA programming register
715 * set, making them ready for next DMA autoreinitialization.
716 */
717 }
718
719 /*
720 * Finally, try fetching next buffer.
721 * In CONTIG mode, it will also enter it into the DMA programming
722 * register set, making it ready for next DMA autoreinitialization.
723 */
724 prepare_next_vb(pcdev);
725 }
726
727 static void dma_isr(int channel, unsigned short status, void *data)
728 {
729 struct omap1_cam_dev *pcdev = data;
730 struct omap1_cam_buf *buf = pcdev->active;
731 unsigned long flags;
732
733 spin_lock_irqsave(&pcdev->lock, flags);
734
735 if (WARN_ON(!buf)) {
736 suspend_capture(pcdev);
737 disable_capture(pcdev);
738 goto out;
739 }
740
741 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
742 /*
743 * In CONTIG mode, assume we have just managed to collect the
744 * whole frame, hopefully before our end of frame watchdog is
745 * triggered. Then, all we have to do is disabling the watchdog
746 * for this frame, and calling videobuf_done() with success
747 * indicated.
748 */
749 CAM_WRITE(pcdev, MODE,
750 CAM_READ_CACHE(pcdev, MODE) & ~EN_V_DOWN);
751 videobuf_done(pcdev, VIDEOBUF_DONE);
752 } else {
753 /*
754 * In SG mode, we have to process every sgbuf from the current
755 * sglist, one after another.
756 */
757 if (buf->sgbuf) {
758 /*
759 * Current sglist not completed yet, try fetching next
760 * sgbuf, hopefully putting it into the DMA programming
761 * register set, making it ready for next DMA
762 * autoreinitialization.
763 */
764 try_next_sgbuf(pcdev->dma_ch, buf);
765 if (buf->sgbuf)
766 goto out;
767
768 /*
769 * No more sgbufs left in the current sglist. This
770 * doesn't mean that the whole videobuffer is already
771 * complete, but only that the last sgbuf from the
772 * current sglist is about to be filled. It will be
773 * ready on next DMA interrupt, signalled with the
774 * buf->sgbuf set back to NULL.
775 */
776 if (buf->result != VIDEOBUF_ERROR) {
777 /*
778 * Video frame collected without errors so far,
779 * we can prepare for collecting a next one
780 * as soon as DMA gets autoreinitialized
781 * after the current (last) sgbuf is completed.
782 */
783 buf = prepare_next_vb(pcdev);
784 if (!buf)
785 goto out;
786
787 try_next_sgbuf(pcdev->dma_ch, buf);
788 goto out;
789 }
790 }
791 /* end of videobuf */
792 videobuf_done(pcdev, buf->result);
793 }
794
795 out:
796 spin_unlock_irqrestore(&pcdev->lock, flags);
797 }
798
799 static irqreturn_t cam_isr(int irq, void *data)
800 {
801 struct omap1_cam_dev *pcdev = data;
802 struct device *dev = pcdev->icd->parent;
803 struct omap1_cam_buf *buf = pcdev->active;
804 u32 it_status;
805 unsigned long flags;
806
807 it_status = CAM_READ(pcdev, IT_STATUS);
808 if (!it_status)
809 return IRQ_NONE;
810
811 spin_lock_irqsave(&pcdev->lock, flags);
812
813 if (WARN_ON(!buf)) {
814 dev_warn(dev, "%s: unhandled camera interrupt, status == %#x\n",
815 __func__, it_status);
816 suspend_capture(pcdev);
817 disable_capture(pcdev);
818 goto out;
819 }
820
821 if (unlikely(it_status & FIFO_FULL)) {
822 dev_warn(dev, "%s: FIFO overflow\n", __func__);
823
824 } else if (it_status & V_DOWN) {
825 /* end of video frame watchdog */
826 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
827 /*
828 * In CONTIG mode, the watchdog is disabled with
829 * successful DMA end of block interrupt, and reenabled
830 * on next frame start. If we get here, there is nothing
831 * to check, we must be out of sync.
832 */
833 } else {
834 if (buf->sgcount == 2) {
835 /*
836 * If exactly 2 sgbufs from the next sglist have
837 * been programmed into the DMA engine (the
838 * first one already transferred into the DMA
839 * runtime register set, the second one still
840 * in the programming set), then we are in sync.
841 */
842 goto out;
843 }
844 }
845 dev_notice(dev, "%s: unexpected end of video frame\n",
846 __func__);
847
848 } else if (it_status & V_UP) {
849 u32 mode;
850
851 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
852 /*
853 * In CONTIG mode, we need this interrupt every frame
854 * in oredr to reenable our end of frame watchdog.
855 */
856 mode = CAM_READ_CACHE(pcdev, MODE);
857 } else {
858 /*
859 * In SG mode, the below enabled end of frame watchdog
860 * is kept on permanently, so we can turn this one shot
861 * setup off.
862 */
863 mode = CAM_READ_CACHE(pcdev, MODE) & ~EN_V_UP;
864 }
865
866 if (!(mode & EN_V_DOWN)) {
867 /* (re)enable end of frame watchdog interrupt */
868 mode |= EN_V_DOWN;
869 }
870 CAM_WRITE(pcdev, MODE, mode);
871 goto out;
872
873 } else {
874 dev_warn(dev, "%s: unhandled camera interrupt, status == %#x\n",
875 __func__, it_status);
876 goto out;
877 }
878
879 videobuf_done(pcdev, VIDEOBUF_ERROR);
880 out:
881 spin_unlock_irqrestore(&pcdev->lock, flags);
882 return IRQ_HANDLED;
883 }
884
885 static struct videobuf_queue_ops omap1_videobuf_ops = {
886 .buf_setup = omap1_videobuf_setup,
887 .buf_prepare = omap1_videobuf_prepare,
888 .buf_queue = omap1_videobuf_queue,
889 .buf_release = omap1_videobuf_release,
890 };
891
892
893 /*
894 * SOC Camera host operations
895 */
896
897 static void sensor_reset(struct omap1_cam_dev *pcdev, bool reset)
898 {
899 /* apply/release camera sensor reset if requested by platform data */
900 if (pcdev->pflags & OMAP1_CAMERA_RST_HIGH)
901 CAM_WRITE(pcdev, GPIO, reset);
902 else if (pcdev->pflags & OMAP1_CAMERA_RST_LOW)
903 CAM_WRITE(pcdev, GPIO, !reset);
904 }
905
906 /*
907 * The following two functions absolutely depend on the fact, that
908 * there can be only one camera on OMAP1 camera sensor interface
909 */
910 static int omap1_cam_add_device(struct soc_camera_device *icd)
911 {
912 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
913 struct omap1_cam_dev *pcdev = ici->priv;
914 u32 ctrlclock;
915
916 if (pcdev->icd)
917 return -EBUSY;
918
919 clk_enable(pcdev->clk);
920
921 /* setup sensor clock */
922 ctrlclock = CAM_READ(pcdev, CTRLCLOCK);
923 ctrlclock &= ~(CAMEXCLK_EN | MCLK_EN | DPLL_EN);
924 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
925
926 ctrlclock &= ~FOSCMOD_MASK;
927 switch (pcdev->camexclk) {
928 case 6000000:
929 ctrlclock |= CAMEXCLK_EN | FOSCMOD_6MHz;
930 break;
931 case 8000000:
932 ctrlclock |= CAMEXCLK_EN | FOSCMOD_8MHz | DPLL_EN;
933 break;
934 case 9600000:
935 ctrlclock |= CAMEXCLK_EN | FOSCMOD_9_6MHz | DPLL_EN;
936 break;
937 case 12000000:
938 ctrlclock |= CAMEXCLK_EN | FOSCMOD_12MHz;
939 break;
940 case 24000000:
941 ctrlclock |= CAMEXCLK_EN | FOSCMOD_24MHz | DPLL_EN;
942 default:
943 break;
944 }
945 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~DPLL_EN);
946
947 /* enable internal clock */
948 ctrlclock |= MCLK_EN;
949 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
950
951 sensor_reset(pcdev, false);
952
953 pcdev->icd = icd;
954
955 dev_dbg(icd->parent, "OMAP1 Camera driver attached to camera %d\n",
956 icd->devnum);
957 return 0;
958 }
959
960 static void omap1_cam_remove_device(struct soc_camera_device *icd)
961 {
962 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
963 struct omap1_cam_dev *pcdev = ici->priv;
964 u32 ctrlclock;
965
966 BUG_ON(icd != pcdev->icd);
967
968 suspend_capture(pcdev);
969 disable_capture(pcdev);
970
971 sensor_reset(pcdev, true);
972
973 /* disable and release system clocks */
974 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
975 ctrlclock &= ~(MCLK_EN | DPLL_EN | CAMEXCLK_EN);
976 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
977
978 ctrlclock = (ctrlclock & ~FOSCMOD_MASK) | FOSCMOD_12MHz;
979 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
980 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock | MCLK_EN);
981
982 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~MCLK_EN);
983
984 clk_disable(pcdev->clk);
985
986 pcdev->icd = NULL;
987
988 dev_dbg(icd->parent,
989 "OMAP1 Camera driver detached from camera %d\n", icd->devnum);
990 }
991
992 /* Duplicate standard formats based on host capability of byte swapping */
993 static const struct soc_mbus_lookup omap1_cam_formats[] = {
994 {
995 .code = V4L2_MBUS_FMT_UYVY8_2X8,
996 .fmt = {
997 .fourcc = V4L2_PIX_FMT_YUYV,
998 .name = "YUYV",
999 .bits_per_sample = 8,
1000 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1001 .order = SOC_MBUS_ORDER_BE,
1002 },
1003 }, {
1004 .code = V4L2_MBUS_FMT_VYUY8_2X8,
1005 .fmt = {
1006 .fourcc = V4L2_PIX_FMT_YVYU,
1007 .name = "YVYU",
1008 .bits_per_sample = 8,
1009 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1010 .order = SOC_MBUS_ORDER_BE,
1011 },
1012 }, {
1013 .code = V4L2_MBUS_FMT_YUYV8_2X8,
1014 .fmt = {
1015 .fourcc = V4L2_PIX_FMT_UYVY,
1016 .name = "UYVY",
1017 .bits_per_sample = 8,
1018 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1019 .order = SOC_MBUS_ORDER_BE,
1020 },
1021 }, {
1022 .code = V4L2_MBUS_FMT_YVYU8_2X8,
1023 .fmt = {
1024 .fourcc = V4L2_PIX_FMT_VYUY,
1025 .name = "VYUY",
1026 .bits_per_sample = 8,
1027 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1028 .order = SOC_MBUS_ORDER_BE,
1029 },
1030 }, {
1031 .code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE,
1032 .fmt = {
1033 .fourcc = V4L2_PIX_FMT_RGB555,
1034 .name = "RGB555",
1035 .bits_per_sample = 8,
1036 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1037 .order = SOC_MBUS_ORDER_BE,
1038 },
1039 }, {
1040 .code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE,
1041 .fmt = {
1042 .fourcc = V4L2_PIX_FMT_RGB555X,
1043 .name = "RGB555X",
1044 .bits_per_sample = 8,
1045 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1046 .order = SOC_MBUS_ORDER_BE,
1047 },
1048 }, {
1049 .code = V4L2_MBUS_FMT_RGB565_2X8_BE,
1050 .fmt = {
1051 .fourcc = V4L2_PIX_FMT_RGB565,
1052 .name = "RGB565",
1053 .bits_per_sample = 8,
1054 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1055 .order = SOC_MBUS_ORDER_BE,
1056 },
1057 }, {
1058 .code = V4L2_MBUS_FMT_RGB565_2X8_LE,
1059 .fmt = {
1060 .fourcc = V4L2_PIX_FMT_RGB565X,
1061 .name = "RGB565X",
1062 .bits_per_sample = 8,
1063 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1064 .order = SOC_MBUS_ORDER_BE,
1065 },
1066 },
1067 };
1068
1069 static int omap1_cam_get_formats(struct soc_camera_device *icd,
1070 unsigned int idx, struct soc_camera_format_xlate *xlate)
1071 {
1072 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1073 struct device *dev = icd->parent;
1074 int formats = 0, ret;
1075 enum v4l2_mbus_pixelcode code;
1076 const struct soc_mbus_pixelfmt *fmt;
1077
1078 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1079 if (ret < 0)
1080 /* No more formats */
1081 return 0;
1082
1083 fmt = soc_mbus_get_fmtdesc(code);
1084 if (!fmt) {
1085 dev_warn(dev, "%s: unsupported format code #%d: %d\n", __func__,
1086 idx, code);
1087 return 0;
1088 }
1089
1090 /* Check support for the requested bits-per-sample */
1091 if (fmt->bits_per_sample != 8)
1092 return 0;
1093
1094 switch (code) {
1095 case V4L2_MBUS_FMT_YUYV8_2X8:
1096 case V4L2_MBUS_FMT_YVYU8_2X8:
1097 case V4L2_MBUS_FMT_UYVY8_2X8:
1098 case V4L2_MBUS_FMT_VYUY8_2X8:
1099 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
1100 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE:
1101 case V4L2_MBUS_FMT_RGB565_2X8_BE:
1102 case V4L2_MBUS_FMT_RGB565_2X8_LE:
1103 formats++;
1104 if (xlate) {
1105 xlate->host_fmt = soc_mbus_find_fmtdesc(code,
1106 omap1_cam_formats,
1107 ARRAY_SIZE(omap1_cam_formats));
1108 xlate->code = code;
1109 xlate++;
1110 dev_dbg(dev,
1111 "%s: providing format %s as byte swapped code #%d\n",
1112 __func__, xlate->host_fmt->name, code);
1113 }
1114 default:
1115 if (xlate)
1116 dev_dbg(dev,
1117 "%s: providing format %s in pass-through mode\n",
1118 __func__, fmt->name);
1119 }
1120 formats++;
1121 if (xlate) {
1122 xlate->host_fmt = fmt;
1123 xlate->code = code;
1124 xlate++;
1125 }
1126
1127 return formats;
1128 }
1129
1130 static bool is_dma_aligned(s32 bytes_per_line, unsigned int height,
1131 enum omap1_cam_vb_mode vb_mode)
1132 {
1133 int size = bytes_per_line * height;
1134
1135 return IS_ALIGNED(bytes_per_line, DMA_ELEMENT_SIZE) &&
1136 IS_ALIGNED(size, DMA_FRAME_SIZE(vb_mode) * DMA_ELEMENT_SIZE);
1137 }
1138
1139 static int dma_align(int *width, int *height,
1140 const struct soc_mbus_pixelfmt *fmt,
1141 enum omap1_cam_vb_mode vb_mode, bool enlarge)
1142 {
1143 s32 bytes_per_line = soc_mbus_bytes_per_line(*width, fmt);
1144
1145 if (bytes_per_line < 0)
1146 return bytes_per_line;
1147
1148 if (!is_dma_aligned(bytes_per_line, *height, vb_mode)) {
1149 unsigned int pxalign = __fls(bytes_per_line / *width);
1150 unsigned int salign = DMA_FRAME_SHIFT(vb_mode) +
1151 DMA_ELEMENT_SHIFT - pxalign;
1152 unsigned int incr = enlarge << salign;
1153
1154 v4l_bound_align_image(width, 1, *width + incr, 0,
1155 height, 1, *height + incr, 0, salign);
1156 return 0;
1157 }
1158 return 1;
1159 }
1160
1161 #define subdev_call_with_sense(pcdev, dev, icd, sd, function, args...) \
1162 ({ \
1163 struct soc_camera_sense sense = { \
1164 .master_clock = pcdev->camexclk, \
1165 .pixel_clock_max = 0, \
1166 }; \
1167 int __ret; \
1168 \
1169 if (pcdev->pdata) \
1170 sense.pixel_clock_max = pcdev->pdata->lclk_khz_max * 1000; \
1171 icd->sense = &sense; \
1172 __ret = v4l2_subdev_call(sd, video, function, ##args); \
1173 icd->sense = NULL; \
1174 \
1175 if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) { \
1176 if (sense.pixel_clock > sense.pixel_clock_max) { \
1177 dev_err(dev, \
1178 "%s: pixel clock %lu set by the camera too high!\n", \
1179 __func__, sense.pixel_clock); \
1180 __ret = -EINVAL; \
1181 } \
1182 } \
1183 __ret; \
1184 })
1185
1186 static int set_mbus_format(struct omap1_cam_dev *pcdev, struct device *dev,
1187 struct soc_camera_device *icd, struct v4l2_subdev *sd,
1188 struct v4l2_mbus_framefmt *mf,
1189 const struct soc_camera_format_xlate *xlate)
1190 {
1191 s32 bytes_per_line;
1192 int ret = subdev_call_with_sense(pcdev, dev, icd, sd, s_mbus_fmt, mf);
1193
1194 if (ret < 0) {
1195 dev_err(dev, "%s: s_mbus_fmt failed\n", __func__);
1196 return ret;
1197 }
1198
1199 if (mf->code != xlate->code) {
1200 dev_err(dev, "%s: unexpected pixel code change\n", __func__);
1201 return -EINVAL;
1202 }
1203
1204 bytes_per_line = soc_mbus_bytes_per_line(mf->width, xlate->host_fmt);
1205 if (bytes_per_line < 0) {
1206 dev_err(dev, "%s: soc_mbus_bytes_per_line() failed\n",
1207 __func__);
1208 return bytes_per_line;
1209 }
1210
1211 if (!is_dma_aligned(bytes_per_line, mf->height, pcdev->vb_mode)) {
1212 dev_err(dev, "%s: resulting geometry %ux%u not DMA aligned\n",
1213 __func__, mf->width, mf->height);
1214 return -EINVAL;
1215 }
1216 return 0;
1217 }
1218
1219 static int omap1_cam_set_crop(struct soc_camera_device *icd,
1220 struct v4l2_crop *crop)
1221 {
1222 struct v4l2_rect *rect = &crop->c;
1223 const struct soc_camera_format_xlate *xlate = icd->current_fmt;
1224 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1225 struct device *dev = icd->parent;
1226 struct soc_camera_host *ici = to_soc_camera_host(dev);
1227 struct omap1_cam_dev *pcdev = ici->priv;
1228 struct v4l2_mbus_framefmt mf;
1229 int ret;
1230
1231 ret = subdev_call_with_sense(pcdev, dev, icd, sd, s_crop, crop);
1232 if (ret < 0) {
1233 dev_warn(dev, "%s: failed to crop to %ux%u@%u:%u\n", __func__,
1234 rect->width, rect->height, rect->left, rect->top);
1235 return ret;
1236 }
1237
1238 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1239 if (ret < 0) {
1240 dev_warn(dev, "%s: failed to fetch current format\n", __func__);
1241 return ret;
1242 }
1243
1244 ret = dma_align(&mf.width, &mf.height, xlate->host_fmt, pcdev->vb_mode,
1245 false);
1246 if (ret < 0) {
1247 dev_err(dev, "%s: failed to align %ux%u %s with DMA\n",
1248 __func__, mf.width, mf.height,
1249 xlate->host_fmt->name);
1250 return ret;
1251 }
1252
1253 if (!ret) {
1254 /* sensor returned geometry not DMA aligned, trying to fix */
1255 ret = set_mbus_format(pcdev, dev, icd, sd, &mf, xlate);
1256 if (ret < 0) {
1257 dev_err(dev, "%s: failed to set format\n", __func__);
1258 return ret;
1259 }
1260 }
1261
1262 icd->user_width = mf.width;
1263 icd->user_height = mf.height;
1264
1265 return 0;
1266 }
1267
1268 static int omap1_cam_set_fmt(struct soc_camera_device *icd,
1269 struct v4l2_format *f)
1270 {
1271 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1272 const struct soc_camera_format_xlate *xlate;
1273 struct device *dev = icd->parent;
1274 struct soc_camera_host *ici = to_soc_camera_host(dev);
1275 struct omap1_cam_dev *pcdev = ici->priv;
1276 struct v4l2_pix_format *pix = &f->fmt.pix;
1277 struct v4l2_mbus_framefmt mf;
1278 int ret;
1279
1280 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1281 if (!xlate) {
1282 dev_warn(dev, "%s: format %#x not found\n", __func__,
1283 pix->pixelformat);
1284 return -EINVAL;
1285 }
1286
1287 mf.width = pix->width;
1288 mf.height = pix->height;
1289 mf.field = pix->field;
1290 mf.colorspace = pix->colorspace;
1291 mf.code = xlate->code;
1292
1293 ret = dma_align(&mf.width, &mf.height, xlate->host_fmt, pcdev->vb_mode,
1294 true);
1295 if (ret < 0) {
1296 dev_err(dev, "%s: failed to align %ux%u %s with DMA\n",
1297 __func__, pix->width, pix->height,
1298 xlate->host_fmt->name);
1299 return ret;
1300 }
1301
1302 ret = set_mbus_format(pcdev, dev, icd, sd, &mf, xlate);
1303 if (ret < 0) {
1304 dev_err(dev, "%s: failed to set format\n", __func__);
1305 return ret;
1306 }
1307
1308 pix->width = mf.width;
1309 pix->height = mf.height;
1310 pix->field = mf.field;
1311 pix->colorspace = mf.colorspace;
1312 icd->current_fmt = xlate;
1313
1314 return 0;
1315 }
1316
1317 static int omap1_cam_try_fmt(struct soc_camera_device *icd,
1318 struct v4l2_format *f)
1319 {
1320 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1321 const struct soc_camera_format_xlate *xlate;
1322 struct v4l2_pix_format *pix = &f->fmt.pix;
1323 struct v4l2_mbus_framefmt mf;
1324 int ret;
1325 /* TODO: limit to mx1 hardware capabilities */
1326
1327 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1328 if (!xlate) {
1329 dev_warn(icd->parent, "Format %#x not found\n",
1330 pix->pixelformat);
1331 return -EINVAL;
1332 }
1333
1334 mf.width = pix->width;
1335 mf.height = pix->height;
1336 mf.field = pix->field;
1337 mf.colorspace = pix->colorspace;
1338 mf.code = xlate->code;
1339
1340 /* limit to sensor capabilities */
1341 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1342 if (ret < 0)
1343 return ret;
1344
1345 pix->width = mf.width;
1346 pix->height = mf.height;
1347 pix->field = mf.field;
1348 pix->colorspace = mf.colorspace;
1349
1350 return 0;
1351 }
1352
1353 static bool sg_mode;
1354
1355 /*
1356 * Local mmap_mapper wrapper,
1357 * used for detecting videobuf-dma-contig buffer allocation failures
1358 * and switching to videobuf-dma-sg automatically for future attempts.
1359 */
1360 static int omap1_cam_mmap_mapper(struct videobuf_queue *q,
1361 struct videobuf_buffer *buf,
1362 struct vm_area_struct *vma)
1363 {
1364 struct soc_camera_device *icd = q->priv_data;
1365 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1366 struct omap1_cam_dev *pcdev = ici->priv;
1367 int ret;
1368
1369 ret = pcdev->mmap_mapper(q, buf, vma);
1370
1371 if (ret == -ENOMEM)
1372 sg_mode = true;
1373
1374 return ret;
1375 }
1376
1377 static void omap1_cam_init_videobuf(struct videobuf_queue *q,
1378 struct soc_camera_device *icd)
1379 {
1380 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1381 struct omap1_cam_dev *pcdev = ici->priv;
1382
1383 if (!sg_mode)
1384 videobuf_queue_dma_contig_init(q, &omap1_videobuf_ops,
1385 icd->parent, &pcdev->lock,
1386 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
1387 sizeof(struct omap1_cam_buf), icd, &icd->video_lock);
1388 else
1389 videobuf_queue_sg_init(q, &omap1_videobuf_ops,
1390 icd->parent, &pcdev->lock,
1391 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
1392 sizeof(struct omap1_cam_buf), icd, &icd->video_lock);
1393
1394 /* use videobuf mode (auto)selected with the module parameter */
1395 pcdev->vb_mode = sg_mode ? OMAP1_CAM_DMA_SG : OMAP1_CAM_DMA_CONTIG;
1396
1397 /*
1398 * Ensure we substitute the videobuf-dma-contig version of the
1399 * mmap_mapper() callback with our own wrapper, used for switching
1400 * automatically to videobuf-dma-sg on buffer allocation failure.
1401 */
1402 if (!sg_mode && q->int_ops->mmap_mapper != omap1_cam_mmap_mapper) {
1403 pcdev->mmap_mapper = q->int_ops->mmap_mapper;
1404 q->int_ops->mmap_mapper = omap1_cam_mmap_mapper;
1405 }
1406 }
1407
1408 static int omap1_cam_reqbufs(struct soc_camera_device *icd,
1409 struct v4l2_requestbuffers *p)
1410 {
1411 int i;
1412
1413 /*
1414 * This is for locking debugging only. I removed spinlocks and now I
1415 * check whether .prepare is ever called on a linked buffer, or whether
1416 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1417 * it hadn't triggered
1418 */
1419 for (i = 0; i < p->count; i++) {
1420 struct omap1_cam_buf *buf = container_of(icd->vb_vidq.bufs[i],
1421 struct omap1_cam_buf, vb);
1422 buf->inwork = 0;
1423 INIT_LIST_HEAD(&buf->vb.queue);
1424 }
1425
1426 return 0;
1427 }
1428
1429 static int omap1_cam_querycap(struct soc_camera_host *ici,
1430 struct v4l2_capability *cap)
1431 {
1432 /* cap->name is set by the friendly caller:-> */
1433 strlcpy(cap->card, "OMAP1 Camera", sizeof(cap->card));
1434 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1435
1436 return 0;
1437 }
1438
1439 static int omap1_cam_set_bus_param(struct soc_camera_device *icd)
1440 {
1441 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1442 struct device *dev = icd->parent;
1443 struct soc_camera_host *ici = to_soc_camera_host(dev);
1444 struct omap1_cam_dev *pcdev = ici->priv;
1445 u32 pixfmt = icd->current_fmt->host_fmt->fourcc;
1446 const struct soc_camera_format_xlate *xlate;
1447 const struct soc_mbus_pixelfmt *fmt;
1448 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
1449 unsigned long common_flags;
1450 u32 ctrlclock, mode;
1451 int ret;
1452
1453 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
1454 if (!ret) {
1455 common_flags = soc_mbus_config_compatible(&cfg, SOCAM_BUS_FLAGS);
1456 if (!common_flags) {
1457 dev_warn(dev,
1458 "Flags incompatible: camera 0x%x, host 0x%x\n",
1459 cfg.flags, SOCAM_BUS_FLAGS);
1460 return -EINVAL;
1461 }
1462 } else if (ret != -ENOIOCTLCMD) {
1463 return ret;
1464 } else {
1465 common_flags = SOCAM_BUS_FLAGS;
1466 }
1467
1468 /* Make choices, possibly based on platform configuration */
1469 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
1470 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
1471 if (!pcdev->pdata ||
1472 pcdev->pdata->flags & OMAP1_CAMERA_LCLK_RISING)
1473 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
1474 else
1475 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
1476 }
1477
1478 cfg.flags = common_flags;
1479 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
1480 if (ret < 0 && ret != -ENOIOCTLCMD) {
1481 dev_dbg(dev, "camera s_mbus_config(0x%lx) returned %d\n",
1482 common_flags, ret);
1483 return ret;
1484 }
1485
1486 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
1487 if (ctrlclock & LCLK_EN)
1488 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
1489
1490 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) {
1491 dev_dbg(dev, "CTRLCLOCK_REG |= POLCLK\n");
1492 ctrlclock |= POLCLK;
1493 } else {
1494 dev_dbg(dev, "CTRLCLOCK_REG &= ~POLCLK\n");
1495 ctrlclock &= ~POLCLK;
1496 }
1497 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
1498
1499 if (ctrlclock & LCLK_EN)
1500 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
1501
1502 /* select bus endianess */
1503 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1504 fmt = xlate->host_fmt;
1505
1506 mode = CAM_READ(pcdev, MODE) & ~(RAZ_FIFO | IRQ_MASK | DMA);
1507 if (fmt->order == SOC_MBUS_ORDER_LE) {
1508 dev_dbg(dev, "MODE_REG &= ~ORDERCAMD\n");
1509 CAM_WRITE(pcdev, MODE, mode & ~ORDERCAMD);
1510 } else {
1511 dev_dbg(dev, "MODE_REG |= ORDERCAMD\n");
1512 CAM_WRITE(pcdev, MODE, mode | ORDERCAMD);
1513 }
1514
1515 return 0;
1516 }
1517
1518 static unsigned int omap1_cam_poll(struct file *file, poll_table *pt)
1519 {
1520 struct soc_camera_device *icd = file->private_data;
1521 struct omap1_cam_buf *buf;
1522
1523 buf = list_entry(icd->vb_vidq.stream.next, struct omap1_cam_buf,
1524 vb.stream);
1525
1526 poll_wait(file, &buf->vb.done, pt);
1527
1528 if (buf->vb.state == VIDEOBUF_DONE ||
1529 buf->vb.state == VIDEOBUF_ERROR)
1530 return POLLIN | POLLRDNORM;
1531
1532 return 0;
1533 }
1534
1535 static struct soc_camera_host_ops omap1_host_ops = {
1536 .owner = THIS_MODULE,
1537 .add = omap1_cam_add_device,
1538 .remove = omap1_cam_remove_device,
1539 .get_formats = omap1_cam_get_formats,
1540 .set_crop = omap1_cam_set_crop,
1541 .set_fmt = omap1_cam_set_fmt,
1542 .try_fmt = omap1_cam_try_fmt,
1543 .init_videobuf = omap1_cam_init_videobuf,
1544 .reqbufs = omap1_cam_reqbufs,
1545 .querycap = omap1_cam_querycap,
1546 .set_bus_param = omap1_cam_set_bus_param,
1547 .poll = omap1_cam_poll,
1548 };
1549
1550 static int __init omap1_cam_probe(struct platform_device *pdev)
1551 {
1552 struct omap1_cam_dev *pcdev;
1553 struct resource *res;
1554 struct clk *clk;
1555 void __iomem *base;
1556 unsigned int irq;
1557 int err = 0;
1558
1559 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1560 irq = platform_get_irq(pdev, 0);
1561 if (!res || (int)irq <= 0) {
1562 err = -ENODEV;
1563 goto exit;
1564 }
1565
1566 clk = clk_get(&pdev->dev, "armper_ck");
1567 if (IS_ERR(clk)) {
1568 err = PTR_ERR(clk);
1569 goto exit;
1570 }
1571
1572 pcdev = kzalloc(sizeof(*pcdev) + resource_size(res), GFP_KERNEL);
1573 if (!pcdev) {
1574 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1575 err = -ENOMEM;
1576 goto exit_put_clk;
1577 }
1578
1579 pcdev->res = res;
1580 pcdev->clk = clk;
1581
1582 pcdev->pdata = pdev->dev.platform_data;
1583 if (pcdev->pdata) {
1584 pcdev->pflags = pcdev->pdata->flags;
1585 pcdev->camexclk = pcdev->pdata->camexclk_khz * 1000;
1586 }
1587
1588 switch (pcdev->camexclk) {
1589 case 6000000:
1590 case 8000000:
1591 case 9600000:
1592 case 12000000:
1593 case 24000000:
1594 break;
1595 default:
1596 /* pcdev->camexclk != 0 => pcdev->pdata != NULL */
1597 dev_warn(&pdev->dev,
1598 "Incorrect sensor clock frequency %ld kHz, "
1599 "should be one of 0, 6, 8, 9.6, 12 or 24 MHz, "
1600 "please correct your platform data\n",
1601 pcdev->pdata->camexclk_khz);
1602 pcdev->camexclk = 0;
1603 case 0:
1604 dev_info(&pdev->dev, "Not providing sensor clock\n");
1605 }
1606
1607 INIT_LIST_HEAD(&pcdev->capture);
1608 spin_lock_init(&pcdev->lock);
1609
1610 /*
1611 * Request the region.
1612 */
1613 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
1614 err = -EBUSY;
1615 goto exit_kfree;
1616 }
1617
1618 base = ioremap(res->start, resource_size(res));
1619 if (!base) {
1620 err = -ENOMEM;
1621 goto exit_release;
1622 }
1623 pcdev->irq = irq;
1624 pcdev->base = base;
1625
1626 sensor_reset(pcdev, true);
1627
1628 err = omap_request_dma(OMAP_DMA_CAMERA_IF_RX, DRIVER_NAME,
1629 dma_isr, (void *)pcdev, &pcdev->dma_ch);
1630 if (err < 0) {
1631 dev_err(&pdev->dev, "Can't request DMA for OMAP1 Camera\n");
1632 err = -EBUSY;
1633 goto exit_iounmap;
1634 }
1635 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_ch);
1636
1637 /* preconfigure DMA */
1638 omap_set_dma_src_params(pcdev->dma_ch, OMAP_DMA_PORT_TIPB,
1639 OMAP_DMA_AMODE_CONSTANT, res->start + REG_CAMDATA,
1640 0, 0);
1641 omap_set_dma_dest_burst_mode(pcdev->dma_ch, OMAP_DMA_DATA_BURST_4);
1642 /* setup DMA autoinitialization */
1643 omap_dma_link_lch(pcdev->dma_ch, pcdev->dma_ch);
1644
1645 err = request_irq(pcdev->irq, cam_isr, 0, DRIVER_NAME, pcdev);
1646 if (err) {
1647 dev_err(&pdev->dev, "Camera interrupt register failed\n");
1648 goto exit_free_dma;
1649 }
1650
1651 pcdev->soc_host.drv_name = DRIVER_NAME;
1652 pcdev->soc_host.ops = &omap1_host_ops;
1653 pcdev->soc_host.priv = pcdev;
1654 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
1655 pcdev->soc_host.nr = pdev->id;
1656
1657 err = soc_camera_host_register(&pcdev->soc_host);
1658 if (err)
1659 goto exit_free_irq;
1660
1661 dev_info(&pdev->dev, "OMAP1 Camera Interface driver loaded\n");
1662
1663 return 0;
1664
1665 exit_free_irq:
1666 free_irq(pcdev->irq, pcdev);
1667 exit_free_dma:
1668 omap_free_dma(pcdev->dma_ch);
1669 exit_iounmap:
1670 iounmap(base);
1671 exit_release:
1672 release_mem_region(res->start, resource_size(res));
1673 exit_kfree:
1674 kfree(pcdev);
1675 exit_put_clk:
1676 clk_put(clk);
1677 exit:
1678 return err;
1679 }
1680
1681 static int __exit omap1_cam_remove(struct platform_device *pdev)
1682 {
1683 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1684 struct omap1_cam_dev *pcdev = container_of(soc_host,
1685 struct omap1_cam_dev, soc_host);
1686 struct resource *res;
1687
1688 free_irq(pcdev->irq, pcdev);
1689
1690 omap_free_dma(pcdev->dma_ch);
1691
1692 soc_camera_host_unregister(soc_host);
1693
1694 iounmap(pcdev->base);
1695
1696 res = pcdev->res;
1697 release_mem_region(res->start, resource_size(res));
1698
1699 clk_put(pcdev->clk);
1700
1701 kfree(pcdev);
1702
1703 dev_info(&pdev->dev, "OMAP1 Camera Interface driver unloaded\n");
1704
1705 return 0;
1706 }
1707
1708 static struct platform_driver omap1_cam_driver = {
1709 .driver = {
1710 .name = DRIVER_NAME,
1711 },
1712 .probe = omap1_cam_probe,
1713 .remove = __exit_p(omap1_cam_remove),
1714 };
1715
1716 module_platform_driver(omap1_cam_driver);
1717
1718 module_param(sg_mode, bool, 0644);
1719 MODULE_PARM_DESC(sg_mode, "videobuf mode, 0: dma-contig (default), 1: dma-sg");
1720
1721 MODULE_DESCRIPTION("OMAP1 Camera Interface driver");
1722 MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
1723 MODULE_LICENSE("GPL v2");
1724 MODULE_VERSION(DRIVER_VERSION);
1725 MODULE_ALIAS("platform:" DRIVER_NAME);