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/platform/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 <linux/omap-dma.h>
38
39
40 #define DRIVER_NAME "omap1-camera"
41 #define DRIVER_VERSION "0.0.2"
42
43 #define OMAP_DMA_CAMERA_IF_RX 20
44
45 /*
46 * ---------------------------------------------------------------------------
47 * OMAP1 Camera Interface registers
48 * ---------------------------------------------------------------------------
49 */
50
51 #define REG_CTRLCLOCK 0x00
52 #define REG_IT_STATUS 0x04
53 #define REG_MODE 0x08
54 #define REG_STATUS 0x0C
55 #define REG_CAMDATA 0x10
56 #define REG_GPIO 0x14
57 #define REG_PEAK_COUNTER 0x18
58
59 /* CTRLCLOCK bit shifts */
60 #define LCLK_EN BIT(7)
61 #define DPLL_EN BIT(6)
62 #define MCLK_EN BIT(5)
63 #define CAMEXCLK_EN BIT(4)
64 #define POLCLK BIT(3)
65 #define FOSCMOD_SHIFT 0
66 #define FOSCMOD_MASK (0x7 << FOSCMOD_SHIFT)
67 #define FOSCMOD_12MHz 0x0
68 #define FOSCMOD_6MHz 0x2
69 #define FOSCMOD_9_6MHz 0x4
70 #define FOSCMOD_24MHz 0x5
71 #define FOSCMOD_8MHz 0x6
72
73 /* IT_STATUS bit shifts */
74 #define DATA_TRANSFER BIT(5)
75 #define FIFO_FULL BIT(4)
76 #define H_DOWN BIT(3)
77 #define H_UP BIT(2)
78 #define V_DOWN BIT(1)
79 #define V_UP BIT(0)
80
81 /* MODE bit shifts */
82 #define RAZ_FIFO BIT(18)
83 #define EN_FIFO_FULL BIT(17)
84 #define EN_NIRQ BIT(16)
85 #define THRESHOLD_SHIFT 9
86 #define THRESHOLD_MASK (0x7f << THRESHOLD_SHIFT)
87 #define DMA BIT(8)
88 #define EN_H_DOWN BIT(7)
89 #define EN_H_UP BIT(6)
90 #define EN_V_DOWN BIT(5)
91 #define EN_V_UP BIT(4)
92 #define ORDERCAMD BIT(3)
93
94 #define IRQ_MASK (EN_V_UP | EN_V_DOWN | EN_H_UP | EN_H_DOWN | \
95 EN_NIRQ | EN_FIFO_FULL)
96
97 /* STATUS bit shifts */
98 #define HSTATUS BIT(1)
99 #define VSTATUS BIT(0)
100
101 /* GPIO bit shifts */
102 #define CAM_RST BIT(0)
103
104 /* end of OMAP1 Camera Interface registers */
105
106
107 #define SOCAM_BUS_FLAGS (V4L2_MBUS_MASTER | \
108 V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_HIGH | \
109 V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING | \
110 V4L2_MBUS_DATA_ACTIVE_HIGH)
111
112
113 #define FIFO_SIZE ((THRESHOLD_MASK >> THRESHOLD_SHIFT) + 1)
114 #define FIFO_SHIFT __fls(FIFO_SIZE)
115
116 #define DMA_BURST_SHIFT (1 + OMAP_DMA_DATA_BURST_4)
117 #define DMA_BURST_SIZE (1 << DMA_BURST_SHIFT)
118
119 #define DMA_ELEMENT_SHIFT OMAP_DMA_DATA_TYPE_S32
120 #define DMA_ELEMENT_SIZE (1 << DMA_ELEMENT_SHIFT)
121
122 #define DMA_FRAME_SHIFT_CONTIG (FIFO_SHIFT - 1)
123 #define DMA_FRAME_SHIFT_SG DMA_BURST_SHIFT
124
125 #define DMA_FRAME_SHIFT(x) ((x) == OMAP1_CAM_DMA_CONTIG ? \
126 DMA_FRAME_SHIFT_CONTIG : \
127 DMA_FRAME_SHIFT_SG)
128 #define DMA_FRAME_SIZE(x) (1 << DMA_FRAME_SHIFT(x))
129 #define DMA_SYNC OMAP_DMA_SYNC_FRAME
130 #define THRESHOLD_LEVEL DMA_FRAME_SIZE
131
132
133 #define MAX_VIDEO_MEM 4 /* arbitrary video memory limit in MB */
134
135
136 /*
137 * Structures
138 */
139
140 /* buffer for one video frame */
141 struct omap1_cam_buf {
142 struct videobuf_buffer vb;
143 enum v4l2_mbus_pixelcode code;
144 int inwork;
145 struct scatterlist *sgbuf;
146 int sgcount;
147 int bytes_left;
148 enum videobuf_state result;
149 };
150
151 struct omap1_cam_dev {
152 struct soc_camera_host soc_host;
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
cam_write(struct omap1_cam_dev * pcdev,u16 reg,u32 val)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
cam_read(struct omap1_cam_dev * pcdev,u16 reg,bool from_cache)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 */
omap1_videobuf_setup(struct videobuf_queue * vq,unsigned int * count,unsigned int * size)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 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
210 struct omap1_cam_dev *pcdev = ici->priv;
211
212 *size = icd->sizeimage;
213
214 if (!*count || *count < OMAP1_CAMERA_MIN_BUF_COUNT(pcdev->vb_mode))
215 *count = OMAP1_CAMERA_MIN_BUF_COUNT(pcdev->vb_mode);
216
217 if (*size * *count > MAX_VIDEO_MEM * 1024 * 1024)
218 *count = (MAX_VIDEO_MEM * 1024 * 1024) / *size;
219
220 dev_dbg(icd->parent,
221 "%s: count=%d, size=%d\n", __func__, *count, *size);
222
223 return 0;
224 }
225
free_buffer(struct videobuf_queue * vq,struct omap1_cam_buf * buf,enum omap1_cam_vb_mode vb_mode)226 static void free_buffer(struct videobuf_queue *vq, struct omap1_cam_buf *buf,
227 enum omap1_cam_vb_mode vb_mode)
228 {
229 struct videobuf_buffer *vb = &buf->vb;
230
231 BUG_ON(in_interrupt());
232
233 videobuf_waiton(vq, vb, 0, 0);
234
235 if (vb_mode == OMAP1_CAM_DMA_CONTIG) {
236 videobuf_dma_contig_free(vq, vb);
237 } else {
238 struct soc_camera_device *icd = vq->priv_data;
239 struct device *dev = icd->parent;
240 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
241
242 videobuf_dma_unmap(dev, dma);
243 videobuf_dma_free(dma);
244 }
245
246 vb->state = VIDEOBUF_NEEDS_INIT;
247 }
248
omap1_videobuf_prepare(struct videobuf_queue * vq,struct videobuf_buffer * vb,enum v4l2_field field)249 static int omap1_videobuf_prepare(struct videobuf_queue *vq,
250 struct videobuf_buffer *vb, enum v4l2_field field)
251 {
252 struct soc_camera_device *icd = vq->priv_data;
253 struct omap1_cam_buf *buf = container_of(vb, struct omap1_cam_buf, vb);
254 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
255 struct omap1_cam_dev *pcdev = ici->priv;
256 int ret;
257
258 WARN_ON(!list_empty(&vb->queue));
259
260 BUG_ON(NULL == icd->current_fmt);
261
262 buf->inwork = 1;
263
264 if (buf->code != icd->current_fmt->code || vb->field != field ||
265 vb->width != icd->user_width ||
266 vb->height != icd->user_height) {
267 buf->code = icd->current_fmt->code;
268 vb->width = icd->user_width;
269 vb->height = icd->user_height;
270 vb->field = field;
271 vb->state = VIDEOBUF_NEEDS_INIT;
272 }
273
274 vb->size = icd->sizeimage;
275
276 if (vb->baddr && vb->bsize < vb->size) {
277 ret = -EINVAL;
278 goto out;
279 }
280
281 if (vb->state == VIDEOBUF_NEEDS_INIT) {
282 ret = videobuf_iolock(vq, vb, NULL);
283 if (ret)
284 goto fail;
285
286 vb->state = VIDEOBUF_PREPARED;
287 }
288 buf->inwork = 0;
289
290 return 0;
291 fail:
292 free_buffer(vq, buf, pcdev->vb_mode);
293 out:
294 buf->inwork = 0;
295 return ret;
296 }
297
set_dma_dest_params(int dma_ch,struct omap1_cam_buf * buf,enum omap1_cam_vb_mode vb_mode)298 static void set_dma_dest_params(int dma_ch, struct omap1_cam_buf *buf,
299 enum omap1_cam_vb_mode vb_mode)
300 {
301 dma_addr_t dma_addr;
302 unsigned int block_size;
303
304 if (vb_mode == OMAP1_CAM_DMA_CONTIG) {
305 dma_addr = videobuf_to_dma_contig(&buf->vb);
306 block_size = buf->vb.size;
307 } else {
308 if (WARN_ON(!buf->sgbuf)) {
309 buf->result = VIDEOBUF_ERROR;
310 return;
311 }
312 dma_addr = sg_dma_address(buf->sgbuf);
313 if (WARN_ON(!dma_addr)) {
314 buf->sgbuf = NULL;
315 buf->result = VIDEOBUF_ERROR;
316 return;
317 }
318 block_size = sg_dma_len(buf->sgbuf);
319 if (WARN_ON(!block_size)) {
320 buf->sgbuf = NULL;
321 buf->result = VIDEOBUF_ERROR;
322 return;
323 }
324 if (unlikely(buf->bytes_left < block_size))
325 block_size = buf->bytes_left;
326 if (WARN_ON(dma_addr & (DMA_FRAME_SIZE(vb_mode) *
327 DMA_ELEMENT_SIZE - 1))) {
328 dma_addr = ALIGN(dma_addr, DMA_FRAME_SIZE(vb_mode) *
329 DMA_ELEMENT_SIZE);
330 block_size &= ~(DMA_FRAME_SIZE(vb_mode) *
331 DMA_ELEMENT_SIZE - 1);
332 }
333 buf->bytes_left -= block_size;
334 buf->sgcount++;
335 }
336
337 omap_set_dma_dest_params(dma_ch,
338 OMAP_DMA_PORT_EMIFF, OMAP_DMA_AMODE_POST_INC, dma_addr, 0, 0);
339 omap_set_dma_transfer_params(dma_ch,
340 OMAP_DMA_DATA_TYPE_S32, DMA_FRAME_SIZE(vb_mode),
341 block_size >> (DMA_FRAME_SHIFT(vb_mode) + DMA_ELEMENT_SHIFT),
342 DMA_SYNC, 0, 0);
343 }
344
prepare_next_vb(struct omap1_cam_dev * pcdev)345 static struct omap1_cam_buf *prepare_next_vb(struct omap1_cam_dev *pcdev)
346 {
347 struct omap1_cam_buf *buf;
348
349 /*
350 * If there is already a buffer pointed out by the pcdev->ready,
351 * (re)use it, otherwise try to fetch and configure a new one.
352 */
353 buf = pcdev->ready;
354 if (!buf) {
355 if (list_empty(&pcdev->capture))
356 return buf;
357 buf = list_entry(pcdev->capture.next,
358 struct omap1_cam_buf, vb.queue);
359 buf->vb.state = VIDEOBUF_ACTIVE;
360 pcdev->ready = buf;
361 list_del_init(&buf->vb.queue);
362 }
363
364 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
365 /*
366 * In CONTIG mode, we can safely enter next buffer parameters
367 * into the DMA programming register set after the DMA
368 * has already been activated on the previous buffer
369 */
370 set_dma_dest_params(pcdev->dma_ch, buf, pcdev->vb_mode);
371 } else {
372 /*
373 * In SG mode, the above is not safe since there are probably
374 * a bunch of sgbufs from previous sglist still pending.
375 * Instead, mark the sglist fresh for the upcoming
376 * try_next_sgbuf().
377 */
378 buf->sgbuf = NULL;
379 }
380
381 return buf;
382 }
383
try_next_sgbuf(int dma_ch,struct omap1_cam_buf * buf)384 static struct scatterlist *try_next_sgbuf(int dma_ch, struct omap1_cam_buf *buf)
385 {
386 struct scatterlist *sgbuf;
387
388 if (likely(buf->sgbuf)) {
389 /* current sglist is active */
390 if (unlikely(!buf->bytes_left)) {
391 /* indicate sglist complete */
392 sgbuf = NULL;
393 } else {
394 /* process next sgbuf */
395 sgbuf = sg_next(buf->sgbuf);
396 if (WARN_ON(!sgbuf)) {
397 buf->result = VIDEOBUF_ERROR;
398 } else if (WARN_ON(!sg_dma_len(sgbuf))) {
399 sgbuf = NULL;
400 buf->result = VIDEOBUF_ERROR;
401 }
402 }
403 buf->sgbuf = sgbuf;
404 } else {
405 /* sglist is fresh, initialize it before using */
406 struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
407
408 sgbuf = dma->sglist;
409 if (!(WARN_ON(!sgbuf))) {
410 buf->sgbuf = sgbuf;
411 buf->sgcount = 0;
412 buf->bytes_left = buf->vb.size;
413 buf->result = VIDEOBUF_DONE;
414 }
415 }
416 if (sgbuf)
417 /*
418 * Put our next sgbuf parameters (address, size)
419 * into the DMA programming register set.
420 */
421 set_dma_dest_params(dma_ch, buf, OMAP1_CAM_DMA_SG);
422
423 return sgbuf;
424 }
425
start_capture(struct omap1_cam_dev * pcdev)426 static void start_capture(struct omap1_cam_dev *pcdev)
427 {
428 struct omap1_cam_buf *buf = pcdev->active;
429 u32 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
430 u32 mode = CAM_READ_CACHE(pcdev, MODE) & ~EN_V_DOWN;
431
432 if (WARN_ON(!buf))
433 return;
434
435 /*
436 * Enable start of frame interrupt, which we will use for activating
437 * our end of frame watchdog when capture actually starts.
438 */
439 mode |= EN_V_UP;
440
441 if (unlikely(ctrlclock & LCLK_EN))
442 /* stop pixel clock before FIFO reset */
443 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
444 /* reset FIFO */
445 CAM_WRITE(pcdev, MODE, mode | RAZ_FIFO);
446
447 omap_start_dma(pcdev->dma_ch);
448
449 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
450 /*
451 * In SG mode, it's a good moment for fetching next sgbuf
452 * from the current sglist and, if available, already putting
453 * its parameters into the DMA programming register set.
454 */
455 try_next_sgbuf(pcdev->dma_ch, buf);
456 }
457
458 /* (re)enable pixel clock */
459 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock | LCLK_EN);
460 /* release FIFO reset */
461 CAM_WRITE(pcdev, MODE, mode);
462 }
463
suspend_capture(struct omap1_cam_dev * pcdev)464 static void suspend_capture(struct omap1_cam_dev *pcdev)
465 {
466 u32 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
467
468 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
469 omap_stop_dma(pcdev->dma_ch);
470 }
471
disable_capture(struct omap1_cam_dev * pcdev)472 static void disable_capture(struct omap1_cam_dev *pcdev)
473 {
474 u32 mode = CAM_READ_CACHE(pcdev, MODE);
475
476 CAM_WRITE(pcdev, MODE, mode & ~(IRQ_MASK | DMA));
477 }
478
omap1_videobuf_queue(struct videobuf_queue * vq,struct videobuf_buffer * vb)479 static void omap1_videobuf_queue(struct videobuf_queue *vq,
480 struct videobuf_buffer *vb)
481 {
482 struct soc_camera_device *icd = vq->priv_data;
483 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
484 struct omap1_cam_dev *pcdev = ici->priv;
485 struct omap1_cam_buf *buf;
486 u32 mode;
487
488 list_add_tail(&vb->queue, &pcdev->capture);
489 vb->state = VIDEOBUF_QUEUED;
490
491 if (pcdev->active) {
492 /*
493 * Capture in progress, so don't touch pcdev->ready even if
494 * empty. Since the transfer of the DMA programming register set
495 * content to the DMA working register set is done automatically
496 * by the DMA hardware, this can pretty well happen while we
497 * are keeping the lock here. Leave fetching it from the queue
498 * to be done when a next DMA interrupt occures instead.
499 */
500 return;
501 }
502
503 WARN_ON(pcdev->ready);
504
505 buf = prepare_next_vb(pcdev);
506 if (WARN_ON(!buf))
507 return;
508
509 pcdev->active = buf;
510 pcdev->ready = NULL;
511
512 dev_dbg(icd->parent,
513 "%s: capture not active, setup FIFO, start DMA\n", __func__);
514 mode = CAM_READ_CACHE(pcdev, MODE) & ~THRESHOLD_MASK;
515 mode |= THRESHOLD_LEVEL(pcdev->vb_mode) << THRESHOLD_SHIFT;
516 CAM_WRITE(pcdev, MODE, mode | EN_FIFO_FULL | DMA);
517
518 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
519 /*
520 * In SG mode, the above prepare_next_vb() didn't actually
521 * put anything into the DMA programming register set,
522 * so we have to do it now, before activating DMA.
523 */
524 try_next_sgbuf(pcdev->dma_ch, buf);
525 }
526
527 start_capture(pcdev);
528 }
529
omap1_videobuf_release(struct videobuf_queue * vq,struct videobuf_buffer * vb)530 static void omap1_videobuf_release(struct videobuf_queue *vq,
531 struct videobuf_buffer *vb)
532 {
533 struct omap1_cam_buf *buf =
534 container_of(vb, struct omap1_cam_buf, vb);
535 struct soc_camera_device *icd = vq->priv_data;
536 struct device *dev = icd->parent;
537 struct soc_camera_host *ici = to_soc_camera_host(dev);
538 struct omap1_cam_dev *pcdev = ici->priv;
539
540 switch (vb->state) {
541 case VIDEOBUF_DONE:
542 dev_dbg(dev, "%s (done)\n", __func__);
543 break;
544 case VIDEOBUF_ACTIVE:
545 dev_dbg(dev, "%s (active)\n", __func__);
546 break;
547 case VIDEOBUF_QUEUED:
548 dev_dbg(dev, "%s (queued)\n", __func__);
549 break;
550 case VIDEOBUF_PREPARED:
551 dev_dbg(dev, "%s (prepared)\n", __func__);
552 break;
553 default:
554 dev_dbg(dev, "%s (unknown %d)\n", __func__, vb->state);
555 break;
556 }
557
558 free_buffer(vq, buf, pcdev->vb_mode);
559 }
560
videobuf_done(struct omap1_cam_dev * pcdev,enum videobuf_state result)561 static void videobuf_done(struct omap1_cam_dev *pcdev,
562 enum videobuf_state result)
563 {
564 struct omap1_cam_buf *buf = pcdev->active;
565 struct videobuf_buffer *vb;
566 struct device *dev = pcdev->soc_host.icd->parent;
567
568 if (WARN_ON(!buf)) {
569 suspend_capture(pcdev);
570 disable_capture(pcdev);
571 return;
572 }
573
574 if (result == VIDEOBUF_ERROR)
575 suspend_capture(pcdev);
576
577 vb = &buf->vb;
578 if (waitqueue_active(&vb->done)) {
579 if (!pcdev->ready && result != VIDEOBUF_ERROR) {
580 /*
581 * No next buffer has been entered into the DMA
582 * programming register set on time (could be done only
583 * while the previous DMA interurpt was processed, not
584 * later), so the last DMA block, be it a whole buffer
585 * if in CONTIG or its last sgbuf if in SG mode, is
586 * about to be reused by the just autoreinitialized DMA
587 * engine, and overwritten with next frame data. Best we
588 * can do is stopping the capture as soon as possible,
589 * hopefully before the next frame start.
590 */
591 suspend_capture(pcdev);
592 }
593 vb->state = result;
594 v4l2_get_timestamp(&vb->ts);
595 if (result != VIDEOBUF_ERROR)
596 vb->field_count++;
597 wake_up(&vb->done);
598
599 /* shift in next buffer */
600 buf = pcdev->ready;
601 pcdev->active = buf;
602 pcdev->ready = NULL;
603
604 if (!buf) {
605 /*
606 * No next buffer was ready on time (see above), so
607 * indicate error condition to force capture restart or
608 * stop, depending on next buffer already queued or not.
609 */
610 result = VIDEOBUF_ERROR;
611 prepare_next_vb(pcdev);
612
613 buf = pcdev->ready;
614 pcdev->active = buf;
615 pcdev->ready = NULL;
616 }
617 } else if (pcdev->ready) {
618 /*
619 * In both CONTIG and SG mode, the DMA engine has possibly
620 * been already autoreinitialized with the preprogrammed
621 * pcdev->ready buffer. We can either accept this fact
622 * and just swap the buffers, or provoke an error condition
623 * and restart capture. The former seems less intrusive.
624 */
625 dev_dbg(dev, "%s: nobody waiting on videobuf, swap with next\n",
626 __func__);
627 pcdev->active = pcdev->ready;
628
629 if (pcdev->vb_mode == OMAP1_CAM_DMA_SG) {
630 /*
631 * In SG mode, we have to make sure that the buffer we
632 * are putting back into the pcdev->ready is marked
633 * fresh.
634 */
635 buf->sgbuf = NULL;
636 }
637 pcdev->ready = buf;
638
639 buf = pcdev->active;
640 } else {
641 /*
642 * No next buffer has been entered into
643 * the DMA programming register set on time.
644 */
645 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
646 /*
647 * In CONTIG mode, the DMA engine has already been
648 * reinitialized with the current buffer. Best we can do
649 * is not touching it.
650 */
651 dev_dbg(dev,
652 "%s: nobody waiting on videobuf, reuse it\n",
653 __func__);
654 } else {
655 /*
656 * In SG mode, the DMA engine has just been
657 * autoreinitialized with the last sgbuf from the
658 * current list. Restart capture in order to transfer
659 * next frame start into the first sgbuf, not the last
660 * one.
661 */
662 if (result != VIDEOBUF_ERROR) {
663 suspend_capture(pcdev);
664 result = VIDEOBUF_ERROR;
665 }
666 }
667 }
668
669 if (!buf) {
670 dev_dbg(dev, "%s: no more videobufs, stop capture\n", __func__);
671 disable_capture(pcdev);
672 return;
673 }
674
675 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
676 /*
677 * In CONTIG mode, the current buffer parameters had already
678 * been entered into the DMA programming register set while the
679 * buffer was fetched with prepare_next_vb(), they may have also
680 * been transferred into the runtime set and already active if
681 * the DMA still running.
682 */
683 } else {
684 /* In SG mode, extra steps are required */
685 if (result == VIDEOBUF_ERROR)
686 /* make sure we (re)use sglist from start on error */
687 buf->sgbuf = NULL;
688
689 /*
690 * In any case, enter the next sgbuf parameters into the DMA
691 * programming register set. They will be used either during
692 * nearest DMA autoreinitialization or, in case of an error,
693 * on DMA startup below.
694 */
695 try_next_sgbuf(pcdev->dma_ch, buf);
696 }
697
698 if (result == VIDEOBUF_ERROR) {
699 dev_dbg(dev, "%s: videobuf error; reset FIFO, restart DMA\n",
700 __func__);
701 start_capture(pcdev);
702 /*
703 * In SG mode, the above also resulted in the next sgbuf
704 * parameters being entered into the DMA programming register
705 * set, making them ready for next DMA autoreinitialization.
706 */
707 }
708
709 /*
710 * Finally, try fetching next buffer.
711 * In CONTIG mode, it will also enter it into the DMA programming
712 * register set, making it ready for next DMA autoreinitialization.
713 */
714 prepare_next_vb(pcdev);
715 }
716
dma_isr(int channel,unsigned short status,void * data)717 static void dma_isr(int channel, unsigned short status, void *data)
718 {
719 struct omap1_cam_dev *pcdev = data;
720 struct omap1_cam_buf *buf = pcdev->active;
721 unsigned long flags;
722
723 spin_lock_irqsave(&pcdev->lock, flags);
724
725 if (WARN_ON(!buf)) {
726 suspend_capture(pcdev);
727 disable_capture(pcdev);
728 goto out;
729 }
730
731 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
732 /*
733 * In CONTIG mode, assume we have just managed to collect the
734 * whole frame, hopefully before our end of frame watchdog is
735 * triggered. Then, all we have to do is disabling the watchdog
736 * for this frame, and calling videobuf_done() with success
737 * indicated.
738 */
739 CAM_WRITE(pcdev, MODE,
740 CAM_READ_CACHE(pcdev, MODE) & ~EN_V_DOWN);
741 videobuf_done(pcdev, VIDEOBUF_DONE);
742 } else {
743 /*
744 * In SG mode, we have to process every sgbuf from the current
745 * sglist, one after another.
746 */
747 if (buf->sgbuf) {
748 /*
749 * Current sglist not completed yet, try fetching next
750 * sgbuf, hopefully putting it into the DMA programming
751 * register set, making it ready for next DMA
752 * autoreinitialization.
753 */
754 try_next_sgbuf(pcdev->dma_ch, buf);
755 if (buf->sgbuf)
756 goto out;
757
758 /*
759 * No more sgbufs left in the current sglist. This
760 * doesn't mean that the whole videobuffer is already
761 * complete, but only that the last sgbuf from the
762 * current sglist is about to be filled. It will be
763 * ready on next DMA interrupt, signalled with the
764 * buf->sgbuf set back to NULL.
765 */
766 if (buf->result != VIDEOBUF_ERROR) {
767 /*
768 * Video frame collected without errors so far,
769 * we can prepare for collecting a next one
770 * as soon as DMA gets autoreinitialized
771 * after the current (last) sgbuf is completed.
772 */
773 buf = prepare_next_vb(pcdev);
774 if (!buf)
775 goto out;
776
777 try_next_sgbuf(pcdev->dma_ch, buf);
778 goto out;
779 }
780 }
781 /* end of videobuf */
782 videobuf_done(pcdev, buf->result);
783 }
784
785 out:
786 spin_unlock_irqrestore(&pcdev->lock, flags);
787 }
788
cam_isr(int irq,void * data)789 static irqreturn_t cam_isr(int irq, void *data)
790 {
791 struct omap1_cam_dev *pcdev = data;
792 struct device *dev = pcdev->soc_host.icd->parent;
793 struct omap1_cam_buf *buf = pcdev->active;
794 u32 it_status;
795 unsigned long flags;
796
797 it_status = CAM_READ(pcdev, IT_STATUS);
798 if (!it_status)
799 return IRQ_NONE;
800
801 spin_lock_irqsave(&pcdev->lock, flags);
802
803 if (WARN_ON(!buf)) {
804 dev_warn(dev, "%s: unhandled camera interrupt, status == %#x\n",
805 __func__, it_status);
806 suspend_capture(pcdev);
807 disable_capture(pcdev);
808 goto out;
809 }
810
811 if (unlikely(it_status & FIFO_FULL)) {
812 dev_warn(dev, "%s: FIFO overflow\n", __func__);
813
814 } else if (it_status & V_DOWN) {
815 /* end of video frame watchdog */
816 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
817 /*
818 * In CONTIG mode, the watchdog is disabled with
819 * successful DMA end of block interrupt, and reenabled
820 * on next frame start. If we get here, there is nothing
821 * to check, we must be out of sync.
822 */
823 } else {
824 if (buf->sgcount == 2) {
825 /*
826 * If exactly 2 sgbufs from the next sglist have
827 * been programmed into the DMA engine (the
828 * first one already transferred into the DMA
829 * runtime register set, the second one still
830 * in the programming set), then we are in sync.
831 */
832 goto out;
833 }
834 }
835 dev_notice(dev, "%s: unexpected end of video frame\n",
836 __func__);
837
838 } else if (it_status & V_UP) {
839 u32 mode;
840
841 if (pcdev->vb_mode == OMAP1_CAM_DMA_CONTIG) {
842 /*
843 * In CONTIG mode, we need this interrupt every frame
844 * in oredr to reenable our end of frame watchdog.
845 */
846 mode = CAM_READ_CACHE(pcdev, MODE);
847 } else {
848 /*
849 * In SG mode, the below enabled end of frame watchdog
850 * is kept on permanently, so we can turn this one shot
851 * setup off.
852 */
853 mode = CAM_READ_CACHE(pcdev, MODE) & ~EN_V_UP;
854 }
855
856 if (!(mode & EN_V_DOWN)) {
857 /* (re)enable end of frame watchdog interrupt */
858 mode |= EN_V_DOWN;
859 }
860 CAM_WRITE(pcdev, MODE, mode);
861 goto out;
862
863 } else {
864 dev_warn(dev, "%s: unhandled camera interrupt, status == %#x\n",
865 __func__, it_status);
866 goto out;
867 }
868
869 videobuf_done(pcdev, VIDEOBUF_ERROR);
870 out:
871 spin_unlock_irqrestore(&pcdev->lock, flags);
872 return IRQ_HANDLED;
873 }
874
875 static struct videobuf_queue_ops omap1_videobuf_ops = {
876 .buf_setup = omap1_videobuf_setup,
877 .buf_prepare = omap1_videobuf_prepare,
878 .buf_queue = omap1_videobuf_queue,
879 .buf_release = omap1_videobuf_release,
880 };
881
882
883 /*
884 * SOC Camera host operations
885 */
886
sensor_reset(struct omap1_cam_dev * pcdev,bool reset)887 static void sensor_reset(struct omap1_cam_dev *pcdev, bool reset)
888 {
889 /* apply/release camera sensor reset if requested by platform data */
890 if (pcdev->pflags & OMAP1_CAMERA_RST_HIGH)
891 CAM_WRITE(pcdev, GPIO, reset);
892 else if (pcdev->pflags & OMAP1_CAMERA_RST_LOW)
893 CAM_WRITE(pcdev, GPIO, !reset);
894 }
895
omap1_cam_add_device(struct soc_camera_device * icd)896 static int omap1_cam_add_device(struct soc_camera_device *icd)
897 {
898 dev_dbg(icd->parent, "OMAP1 Camera driver attached to camera %d\n",
899 icd->devnum);
900
901 return 0;
902 }
903
omap1_cam_remove_device(struct soc_camera_device * icd)904 static void omap1_cam_remove_device(struct soc_camera_device *icd)
905 {
906 dev_dbg(icd->parent,
907 "OMAP1 Camera driver detached from camera %d\n", icd->devnum);
908 }
909
910 /*
911 * The following two functions absolutely depend on the fact, that
912 * there can be only one camera on OMAP1 camera sensor interface
913 */
omap1_cam_clock_start(struct soc_camera_host * ici)914 static int omap1_cam_clock_start(struct soc_camera_host *ici)
915 {
916 struct omap1_cam_dev *pcdev = ici->priv;
917 u32 ctrlclock;
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 return 0;
954 }
955
omap1_cam_clock_stop(struct soc_camera_host * ici)956 static void omap1_cam_clock_stop(struct soc_camera_host *ici)
957 {
958 struct omap1_cam_dev *pcdev = ici->priv;
959 u32 ctrlclock;
960
961 suspend_capture(pcdev);
962 disable_capture(pcdev);
963
964 sensor_reset(pcdev, true);
965
966 /* disable and release system clocks */
967 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
968 ctrlclock &= ~(MCLK_EN | DPLL_EN | CAMEXCLK_EN);
969 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
970
971 ctrlclock = (ctrlclock & ~FOSCMOD_MASK) | FOSCMOD_12MHz;
972 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
973 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock | MCLK_EN);
974
975 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~MCLK_EN);
976
977 clk_disable(pcdev->clk);
978 }
979
980 /* Duplicate standard formats based on host capability of byte swapping */
981 static const struct soc_mbus_lookup omap1_cam_formats[] = {
982 {
983 .code = V4L2_MBUS_FMT_UYVY8_2X8,
984 .fmt = {
985 .fourcc = V4L2_PIX_FMT_YUYV,
986 .name = "YUYV",
987 .bits_per_sample = 8,
988 .packing = SOC_MBUS_PACKING_2X8_PADHI,
989 .order = SOC_MBUS_ORDER_BE,
990 .layout = SOC_MBUS_LAYOUT_PACKED,
991 },
992 }, {
993 .code = V4L2_MBUS_FMT_VYUY8_2X8,
994 .fmt = {
995 .fourcc = V4L2_PIX_FMT_YVYU,
996 .name = "YVYU",
997 .bits_per_sample = 8,
998 .packing = SOC_MBUS_PACKING_2X8_PADHI,
999 .order = SOC_MBUS_ORDER_BE,
1000 .layout = SOC_MBUS_LAYOUT_PACKED,
1001 },
1002 }, {
1003 .code = V4L2_MBUS_FMT_YUYV8_2X8,
1004 .fmt = {
1005 .fourcc = V4L2_PIX_FMT_UYVY,
1006 .name = "UYVY",
1007 .bits_per_sample = 8,
1008 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1009 .order = SOC_MBUS_ORDER_BE,
1010 .layout = SOC_MBUS_LAYOUT_PACKED,
1011 },
1012 }, {
1013 .code = V4L2_MBUS_FMT_YVYU8_2X8,
1014 .fmt = {
1015 .fourcc = V4L2_PIX_FMT_VYUY,
1016 .name = "VYUY",
1017 .bits_per_sample = 8,
1018 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1019 .order = SOC_MBUS_ORDER_BE,
1020 .layout = SOC_MBUS_LAYOUT_PACKED,
1021 },
1022 }, {
1023 .code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE,
1024 .fmt = {
1025 .fourcc = V4L2_PIX_FMT_RGB555,
1026 .name = "RGB555",
1027 .bits_per_sample = 8,
1028 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1029 .order = SOC_MBUS_ORDER_BE,
1030 .layout = SOC_MBUS_LAYOUT_PACKED,
1031 },
1032 }, {
1033 .code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE,
1034 .fmt = {
1035 .fourcc = V4L2_PIX_FMT_RGB555X,
1036 .name = "RGB555X",
1037 .bits_per_sample = 8,
1038 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1039 .order = SOC_MBUS_ORDER_BE,
1040 .layout = SOC_MBUS_LAYOUT_PACKED,
1041 },
1042 }, {
1043 .code = V4L2_MBUS_FMT_RGB565_2X8_BE,
1044 .fmt = {
1045 .fourcc = V4L2_PIX_FMT_RGB565,
1046 .name = "RGB565",
1047 .bits_per_sample = 8,
1048 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1049 .order = SOC_MBUS_ORDER_BE,
1050 .layout = SOC_MBUS_LAYOUT_PACKED,
1051 },
1052 }, {
1053 .code = V4L2_MBUS_FMT_RGB565_2X8_LE,
1054 .fmt = {
1055 .fourcc = V4L2_PIX_FMT_RGB565X,
1056 .name = "RGB565X",
1057 .bits_per_sample = 8,
1058 .packing = SOC_MBUS_PACKING_2X8_PADHI,
1059 .order = SOC_MBUS_ORDER_BE,
1060 .layout = SOC_MBUS_LAYOUT_PACKED,
1061 },
1062 },
1063 };
1064
omap1_cam_get_formats(struct soc_camera_device * icd,unsigned int idx,struct soc_camera_format_xlate * xlate)1065 static int omap1_cam_get_formats(struct soc_camera_device *icd,
1066 unsigned int idx, struct soc_camera_format_xlate *xlate)
1067 {
1068 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1069 struct device *dev = icd->parent;
1070 int formats = 0, ret;
1071 enum v4l2_mbus_pixelcode code;
1072 const struct soc_mbus_pixelfmt *fmt;
1073
1074 ret = v4l2_subdev_call(sd, video, enum_mbus_fmt, idx, &code);
1075 if (ret < 0)
1076 /* No more formats */
1077 return 0;
1078
1079 fmt = soc_mbus_get_fmtdesc(code);
1080 if (!fmt) {
1081 dev_warn(dev, "%s: unsupported format code #%d: %d\n", __func__,
1082 idx, code);
1083 return 0;
1084 }
1085
1086 /* Check support for the requested bits-per-sample */
1087 if (fmt->bits_per_sample != 8)
1088 return 0;
1089
1090 switch (code) {
1091 case V4L2_MBUS_FMT_YUYV8_2X8:
1092 case V4L2_MBUS_FMT_YVYU8_2X8:
1093 case V4L2_MBUS_FMT_UYVY8_2X8:
1094 case V4L2_MBUS_FMT_VYUY8_2X8:
1095 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE:
1096 case V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE:
1097 case V4L2_MBUS_FMT_RGB565_2X8_BE:
1098 case V4L2_MBUS_FMT_RGB565_2X8_LE:
1099 formats++;
1100 if (xlate) {
1101 xlate->host_fmt = soc_mbus_find_fmtdesc(code,
1102 omap1_cam_formats,
1103 ARRAY_SIZE(omap1_cam_formats));
1104 xlate->code = code;
1105 xlate++;
1106 dev_dbg(dev,
1107 "%s: providing format %s as byte swapped code #%d\n",
1108 __func__, xlate->host_fmt->name, code);
1109 }
1110 default:
1111 if (xlate)
1112 dev_dbg(dev,
1113 "%s: providing format %s in pass-through mode\n",
1114 __func__, fmt->name);
1115 }
1116 formats++;
1117 if (xlate) {
1118 xlate->host_fmt = fmt;
1119 xlate->code = code;
1120 xlate++;
1121 }
1122
1123 return formats;
1124 }
1125
is_dma_aligned(s32 bytes_per_line,unsigned int height,enum omap1_cam_vb_mode vb_mode)1126 static bool is_dma_aligned(s32 bytes_per_line, unsigned int height,
1127 enum omap1_cam_vb_mode vb_mode)
1128 {
1129 int size = bytes_per_line * height;
1130
1131 return IS_ALIGNED(bytes_per_line, DMA_ELEMENT_SIZE) &&
1132 IS_ALIGNED(size, DMA_FRAME_SIZE(vb_mode) * DMA_ELEMENT_SIZE);
1133 }
1134
dma_align(int * width,int * height,const struct soc_mbus_pixelfmt * fmt,enum omap1_cam_vb_mode vb_mode,bool enlarge)1135 static int dma_align(int *width, int *height,
1136 const struct soc_mbus_pixelfmt *fmt,
1137 enum omap1_cam_vb_mode vb_mode, bool enlarge)
1138 {
1139 s32 bytes_per_line = soc_mbus_bytes_per_line(*width, fmt);
1140
1141 if (bytes_per_line < 0)
1142 return bytes_per_line;
1143
1144 if (!is_dma_aligned(bytes_per_line, *height, vb_mode)) {
1145 unsigned int pxalign = __fls(bytes_per_line / *width);
1146 unsigned int salign = DMA_FRAME_SHIFT(vb_mode) +
1147 DMA_ELEMENT_SHIFT - pxalign;
1148 unsigned int incr = enlarge << salign;
1149
1150 v4l_bound_align_image(width, 1, *width + incr, 0,
1151 height, 1, *height + incr, 0, salign);
1152 return 0;
1153 }
1154 return 1;
1155 }
1156
1157 #define subdev_call_with_sense(pcdev, dev, icd, sd, function, args...) \
1158 ({ \
1159 struct soc_camera_sense sense = { \
1160 .master_clock = pcdev->camexclk, \
1161 .pixel_clock_max = 0, \
1162 }; \
1163 int __ret; \
1164 \
1165 if (pcdev->pdata) \
1166 sense.pixel_clock_max = pcdev->pdata->lclk_khz_max * 1000; \
1167 icd->sense = &sense; \
1168 __ret = v4l2_subdev_call(sd, video, function, ##args); \
1169 icd->sense = NULL; \
1170 \
1171 if (sense.flags & SOCAM_SENSE_PCLK_CHANGED) { \
1172 if (sense.pixel_clock > sense.pixel_clock_max) { \
1173 dev_err(dev, \
1174 "%s: pixel clock %lu set by the camera too high!\n", \
1175 __func__, sense.pixel_clock); \
1176 __ret = -EINVAL; \
1177 } \
1178 } \
1179 __ret; \
1180 })
1181
set_mbus_format(struct omap1_cam_dev * pcdev,struct device * dev,struct soc_camera_device * icd,struct v4l2_subdev * sd,struct v4l2_mbus_framefmt * mf,const struct soc_camera_format_xlate * xlate)1182 static int set_mbus_format(struct omap1_cam_dev *pcdev, struct device *dev,
1183 struct soc_camera_device *icd, struct v4l2_subdev *sd,
1184 struct v4l2_mbus_framefmt *mf,
1185 const struct soc_camera_format_xlate *xlate)
1186 {
1187 s32 bytes_per_line;
1188 int ret = subdev_call_with_sense(pcdev, dev, icd, sd, s_mbus_fmt, mf);
1189
1190 if (ret < 0) {
1191 dev_err(dev, "%s: s_mbus_fmt failed\n", __func__);
1192 return ret;
1193 }
1194
1195 if (mf->code != xlate->code) {
1196 dev_err(dev, "%s: unexpected pixel code change\n", __func__);
1197 return -EINVAL;
1198 }
1199
1200 bytes_per_line = soc_mbus_bytes_per_line(mf->width, xlate->host_fmt);
1201 if (bytes_per_line < 0) {
1202 dev_err(dev, "%s: soc_mbus_bytes_per_line() failed\n",
1203 __func__);
1204 return bytes_per_line;
1205 }
1206
1207 if (!is_dma_aligned(bytes_per_line, mf->height, pcdev->vb_mode)) {
1208 dev_err(dev, "%s: resulting geometry %ux%u not DMA aligned\n",
1209 __func__, mf->width, mf->height);
1210 return -EINVAL;
1211 }
1212 return 0;
1213 }
1214
omap1_cam_set_crop(struct soc_camera_device * icd,const struct v4l2_crop * crop)1215 static int omap1_cam_set_crop(struct soc_camera_device *icd,
1216 const struct v4l2_crop *crop)
1217 {
1218 const struct v4l2_rect *rect = &crop->c;
1219 const struct soc_camera_format_xlate *xlate = icd->current_fmt;
1220 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1221 struct device *dev = icd->parent;
1222 struct soc_camera_host *ici = to_soc_camera_host(dev);
1223 struct omap1_cam_dev *pcdev = ici->priv;
1224 struct v4l2_mbus_framefmt mf;
1225 int ret;
1226
1227 ret = subdev_call_with_sense(pcdev, dev, icd, sd, s_crop, crop);
1228 if (ret < 0) {
1229 dev_warn(dev, "%s: failed to crop to %ux%u@%u:%u\n", __func__,
1230 rect->width, rect->height, rect->left, rect->top);
1231 return ret;
1232 }
1233
1234 ret = v4l2_subdev_call(sd, video, g_mbus_fmt, &mf);
1235 if (ret < 0) {
1236 dev_warn(dev, "%s: failed to fetch current format\n", __func__);
1237 return ret;
1238 }
1239
1240 ret = dma_align(&mf.width, &mf.height, xlate->host_fmt, pcdev->vb_mode,
1241 false);
1242 if (ret < 0) {
1243 dev_err(dev, "%s: failed to align %ux%u %s with DMA\n",
1244 __func__, mf.width, mf.height,
1245 xlate->host_fmt->name);
1246 return ret;
1247 }
1248
1249 if (!ret) {
1250 /* sensor returned geometry not DMA aligned, trying to fix */
1251 ret = set_mbus_format(pcdev, dev, icd, sd, &mf, xlate);
1252 if (ret < 0) {
1253 dev_err(dev, "%s: failed to set format\n", __func__);
1254 return ret;
1255 }
1256 }
1257
1258 icd->user_width = mf.width;
1259 icd->user_height = mf.height;
1260
1261 return 0;
1262 }
1263
omap1_cam_set_fmt(struct soc_camera_device * icd,struct v4l2_format * f)1264 static int omap1_cam_set_fmt(struct soc_camera_device *icd,
1265 struct v4l2_format *f)
1266 {
1267 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1268 const struct soc_camera_format_xlate *xlate;
1269 struct device *dev = icd->parent;
1270 struct soc_camera_host *ici = to_soc_camera_host(dev);
1271 struct omap1_cam_dev *pcdev = ici->priv;
1272 struct v4l2_pix_format *pix = &f->fmt.pix;
1273 struct v4l2_mbus_framefmt mf;
1274 int ret;
1275
1276 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1277 if (!xlate) {
1278 dev_warn(dev, "%s: format %#x not found\n", __func__,
1279 pix->pixelformat);
1280 return -EINVAL;
1281 }
1282
1283 mf.width = pix->width;
1284 mf.height = pix->height;
1285 mf.field = pix->field;
1286 mf.colorspace = pix->colorspace;
1287 mf.code = xlate->code;
1288
1289 ret = dma_align(&mf.width, &mf.height, xlate->host_fmt, pcdev->vb_mode,
1290 true);
1291 if (ret < 0) {
1292 dev_err(dev, "%s: failed to align %ux%u %s with DMA\n",
1293 __func__, pix->width, pix->height,
1294 xlate->host_fmt->name);
1295 return ret;
1296 }
1297
1298 ret = set_mbus_format(pcdev, dev, icd, sd, &mf, xlate);
1299 if (ret < 0) {
1300 dev_err(dev, "%s: failed to set format\n", __func__);
1301 return ret;
1302 }
1303
1304 pix->width = mf.width;
1305 pix->height = mf.height;
1306 pix->field = mf.field;
1307 pix->colorspace = mf.colorspace;
1308 icd->current_fmt = xlate;
1309
1310 return 0;
1311 }
1312
omap1_cam_try_fmt(struct soc_camera_device * icd,struct v4l2_format * f)1313 static int omap1_cam_try_fmt(struct soc_camera_device *icd,
1314 struct v4l2_format *f)
1315 {
1316 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1317 const struct soc_camera_format_xlate *xlate;
1318 struct v4l2_pix_format *pix = &f->fmt.pix;
1319 struct v4l2_mbus_framefmt mf;
1320 int ret;
1321 /* TODO: limit to mx1 hardware capabilities */
1322
1323 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
1324 if (!xlate) {
1325 dev_warn(icd->parent, "Format %#x not found\n",
1326 pix->pixelformat);
1327 return -EINVAL;
1328 }
1329
1330 mf.width = pix->width;
1331 mf.height = pix->height;
1332 mf.field = pix->field;
1333 mf.colorspace = pix->colorspace;
1334 mf.code = xlate->code;
1335
1336 /* limit to sensor capabilities */
1337 ret = v4l2_subdev_call(sd, video, try_mbus_fmt, &mf);
1338 if (ret < 0)
1339 return ret;
1340
1341 pix->width = mf.width;
1342 pix->height = mf.height;
1343 pix->field = mf.field;
1344 pix->colorspace = mf.colorspace;
1345
1346 return 0;
1347 }
1348
1349 static bool sg_mode;
1350
1351 /*
1352 * Local mmap_mapper wrapper,
1353 * used for detecting videobuf-dma-contig buffer allocation failures
1354 * and switching to videobuf-dma-sg automatically for future attempts.
1355 */
omap1_cam_mmap_mapper(struct videobuf_queue * q,struct videobuf_buffer * buf,struct vm_area_struct * vma)1356 static int omap1_cam_mmap_mapper(struct videobuf_queue *q,
1357 struct videobuf_buffer *buf,
1358 struct vm_area_struct *vma)
1359 {
1360 struct soc_camera_device *icd = q->priv_data;
1361 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1362 struct omap1_cam_dev *pcdev = ici->priv;
1363 int ret;
1364
1365 ret = pcdev->mmap_mapper(q, buf, vma);
1366
1367 if (ret == -ENOMEM)
1368 sg_mode = true;
1369
1370 return ret;
1371 }
1372
omap1_cam_init_videobuf(struct videobuf_queue * q,struct soc_camera_device * icd)1373 static void omap1_cam_init_videobuf(struct videobuf_queue *q,
1374 struct soc_camera_device *icd)
1375 {
1376 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1377 struct omap1_cam_dev *pcdev = ici->priv;
1378
1379 if (!sg_mode)
1380 videobuf_queue_dma_contig_init(q, &omap1_videobuf_ops,
1381 icd->parent, &pcdev->lock,
1382 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
1383 sizeof(struct omap1_cam_buf), icd, &ici->host_lock);
1384 else
1385 videobuf_queue_sg_init(q, &omap1_videobuf_ops,
1386 icd->parent, &pcdev->lock,
1387 V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
1388 sizeof(struct omap1_cam_buf), icd, &ici->host_lock);
1389
1390 /* use videobuf mode (auto)selected with the module parameter */
1391 pcdev->vb_mode = sg_mode ? OMAP1_CAM_DMA_SG : OMAP1_CAM_DMA_CONTIG;
1392
1393 /*
1394 * Ensure we substitute the videobuf-dma-contig version of the
1395 * mmap_mapper() callback with our own wrapper, used for switching
1396 * automatically to videobuf-dma-sg on buffer allocation failure.
1397 */
1398 if (!sg_mode && q->int_ops->mmap_mapper != omap1_cam_mmap_mapper) {
1399 pcdev->mmap_mapper = q->int_ops->mmap_mapper;
1400 q->int_ops->mmap_mapper = omap1_cam_mmap_mapper;
1401 }
1402 }
1403
omap1_cam_reqbufs(struct soc_camera_device * icd,struct v4l2_requestbuffers * p)1404 static int omap1_cam_reqbufs(struct soc_camera_device *icd,
1405 struct v4l2_requestbuffers *p)
1406 {
1407 int i;
1408
1409 /*
1410 * This is for locking debugging only. I removed spinlocks and now I
1411 * check whether .prepare is ever called on a linked buffer, or whether
1412 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
1413 * it hadn't triggered
1414 */
1415 for (i = 0; i < p->count; i++) {
1416 struct omap1_cam_buf *buf = container_of(icd->vb_vidq.bufs[i],
1417 struct omap1_cam_buf, vb);
1418 buf->inwork = 0;
1419 INIT_LIST_HEAD(&buf->vb.queue);
1420 }
1421
1422 return 0;
1423 }
1424
omap1_cam_querycap(struct soc_camera_host * ici,struct v4l2_capability * cap)1425 static int omap1_cam_querycap(struct soc_camera_host *ici,
1426 struct v4l2_capability *cap)
1427 {
1428 /* cap->name is set by the friendly caller:-> */
1429 strlcpy(cap->card, "OMAP1 Camera", sizeof(cap->card));
1430 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
1431
1432 return 0;
1433 }
1434
omap1_cam_set_bus_param(struct soc_camera_device * icd)1435 static int omap1_cam_set_bus_param(struct soc_camera_device *icd)
1436 {
1437 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1438 struct device *dev = icd->parent;
1439 struct soc_camera_host *ici = to_soc_camera_host(dev);
1440 struct omap1_cam_dev *pcdev = ici->priv;
1441 u32 pixfmt = icd->current_fmt->host_fmt->fourcc;
1442 const struct soc_camera_format_xlate *xlate;
1443 const struct soc_mbus_pixelfmt *fmt;
1444 struct v4l2_mbus_config cfg = {.type = V4L2_MBUS_PARALLEL,};
1445 unsigned long common_flags;
1446 u32 ctrlclock, mode;
1447 int ret;
1448
1449 ret = v4l2_subdev_call(sd, video, g_mbus_config, &cfg);
1450 if (!ret) {
1451 common_flags = soc_mbus_config_compatible(&cfg, SOCAM_BUS_FLAGS);
1452 if (!common_flags) {
1453 dev_warn(dev,
1454 "Flags incompatible: camera 0x%x, host 0x%x\n",
1455 cfg.flags, SOCAM_BUS_FLAGS);
1456 return -EINVAL;
1457 }
1458 } else if (ret != -ENOIOCTLCMD) {
1459 return ret;
1460 } else {
1461 common_flags = SOCAM_BUS_FLAGS;
1462 }
1463
1464 /* Make choices, possibly based on platform configuration */
1465 if ((common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) &&
1466 (common_flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)) {
1467 if (!pcdev->pdata ||
1468 pcdev->pdata->flags & OMAP1_CAMERA_LCLK_RISING)
1469 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_FALLING;
1470 else
1471 common_flags &= ~V4L2_MBUS_PCLK_SAMPLE_RISING;
1472 }
1473
1474 cfg.flags = common_flags;
1475 ret = v4l2_subdev_call(sd, video, s_mbus_config, &cfg);
1476 if (ret < 0 && ret != -ENOIOCTLCMD) {
1477 dev_dbg(dev, "camera s_mbus_config(0x%lx) returned %d\n",
1478 common_flags, ret);
1479 return ret;
1480 }
1481
1482 ctrlclock = CAM_READ_CACHE(pcdev, CTRLCLOCK);
1483 if (ctrlclock & LCLK_EN)
1484 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
1485
1486 if (common_flags & V4L2_MBUS_PCLK_SAMPLE_RISING) {
1487 dev_dbg(dev, "CTRLCLOCK_REG |= POLCLK\n");
1488 ctrlclock |= POLCLK;
1489 } else {
1490 dev_dbg(dev, "CTRLCLOCK_REG &= ~POLCLK\n");
1491 ctrlclock &= ~POLCLK;
1492 }
1493 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock & ~LCLK_EN);
1494
1495 if (ctrlclock & LCLK_EN)
1496 CAM_WRITE(pcdev, CTRLCLOCK, ctrlclock);
1497
1498 /* select bus endianness */
1499 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1500 fmt = xlate->host_fmt;
1501
1502 mode = CAM_READ(pcdev, MODE) & ~(RAZ_FIFO | IRQ_MASK | DMA);
1503 if (fmt->order == SOC_MBUS_ORDER_LE) {
1504 dev_dbg(dev, "MODE_REG &= ~ORDERCAMD\n");
1505 CAM_WRITE(pcdev, MODE, mode & ~ORDERCAMD);
1506 } else {
1507 dev_dbg(dev, "MODE_REG |= ORDERCAMD\n");
1508 CAM_WRITE(pcdev, MODE, mode | ORDERCAMD);
1509 }
1510
1511 return 0;
1512 }
1513
omap1_cam_poll(struct file * file,poll_table * pt)1514 static unsigned int omap1_cam_poll(struct file *file, poll_table *pt)
1515 {
1516 struct soc_camera_device *icd = file->private_data;
1517 struct omap1_cam_buf *buf;
1518
1519 buf = list_entry(icd->vb_vidq.stream.next, struct omap1_cam_buf,
1520 vb.stream);
1521
1522 poll_wait(file, &buf->vb.done, pt);
1523
1524 if (buf->vb.state == VIDEOBUF_DONE ||
1525 buf->vb.state == VIDEOBUF_ERROR)
1526 return POLLIN | POLLRDNORM;
1527
1528 return 0;
1529 }
1530
1531 static struct soc_camera_host_ops omap1_host_ops = {
1532 .owner = THIS_MODULE,
1533 .add = omap1_cam_add_device,
1534 .remove = omap1_cam_remove_device,
1535 .clock_start = omap1_cam_clock_start,
1536 .clock_stop = omap1_cam_clock_stop,
1537 .get_formats = omap1_cam_get_formats,
1538 .set_crop = omap1_cam_set_crop,
1539 .set_fmt = omap1_cam_set_fmt,
1540 .try_fmt = omap1_cam_try_fmt,
1541 .init_videobuf = omap1_cam_init_videobuf,
1542 .reqbufs = omap1_cam_reqbufs,
1543 .querycap = omap1_cam_querycap,
1544 .set_bus_param = omap1_cam_set_bus_param,
1545 .poll = omap1_cam_poll,
1546 };
1547
omap1_cam_probe(struct platform_device * pdev)1548 static int omap1_cam_probe(struct platform_device *pdev)
1549 {
1550 struct omap1_cam_dev *pcdev;
1551 struct resource *res;
1552 struct clk *clk;
1553 void __iomem *base;
1554 unsigned int irq;
1555 int err = 0;
1556
1557 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1558 irq = platform_get_irq(pdev, 0);
1559 if (!res || (int)irq <= 0) {
1560 err = -ENODEV;
1561 goto exit;
1562 }
1563
1564 clk = clk_get(&pdev->dev, "armper_ck");
1565 if (IS_ERR(clk)) {
1566 err = PTR_ERR(clk);
1567 goto exit;
1568 }
1569
1570 pcdev = kzalloc(sizeof(*pcdev) + resource_size(res), GFP_KERNEL);
1571 if (!pcdev) {
1572 dev_err(&pdev->dev, "Could not allocate pcdev\n");
1573 err = -ENOMEM;
1574 goto exit_put_clk;
1575 }
1576
1577 pcdev->res = res;
1578 pcdev->clk = clk;
1579
1580 pcdev->pdata = pdev->dev.platform_data;
1581 if (pcdev->pdata) {
1582 pcdev->pflags = pcdev->pdata->flags;
1583 pcdev->camexclk = pcdev->pdata->camexclk_khz * 1000;
1584 }
1585
1586 switch (pcdev->camexclk) {
1587 case 6000000:
1588 case 8000000:
1589 case 9600000:
1590 case 12000000:
1591 case 24000000:
1592 break;
1593 default:
1594 /* pcdev->camexclk != 0 => pcdev->pdata != NULL */
1595 dev_warn(&pdev->dev,
1596 "Incorrect sensor clock frequency %ld kHz, "
1597 "should be one of 0, 6, 8, 9.6, 12 or 24 MHz, "
1598 "please correct your platform data\n",
1599 pcdev->pdata->camexclk_khz);
1600 pcdev->camexclk = 0;
1601 case 0:
1602 dev_info(&pdev->dev, "Not providing sensor clock\n");
1603 }
1604
1605 INIT_LIST_HEAD(&pcdev->capture);
1606 spin_lock_init(&pcdev->lock);
1607
1608 /*
1609 * Request the region.
1610 */
1611 if (!request_mem_region(res->start, resource_size(res), DRIVER_NAME)) {
1612 err = -EBUSY;
1613 goto exit_kfree;
1614 }
1615
1616 base = ioremap(res->start, resource_size(res));
1617 if (!base) {
1618 err = -ENOMEM;
1619 goto exit_release;
1620 }
1621 pcdev->irq = irq;
1622 pcdev->base = base;
1623
1624 sensor_reset(pcdev, true);
1625
1626 err = omap_request_dma(OMAP_DMA_CAMERA_IF_RX, DRIVER_NAME,
1627 dma_isr, (void *)pcdev, &pcdev->dma_ch);
1628 if (err < 0) {
1629 dev_err(&pdev->dev, "Can't request DMA for OMAP1 Camera\n");
1630 err = -EBUSY;
1631 goto exit_iounmap;
1632 }
1633 dev_dbg(&pdev->dev, "got DMA channel %d\n", pcdev->dma_ch);
1634
1635 /* preconfigure DMA */
1636 omap_set_dma_src_params(pcdev->dma_ch, OMAP_DMA_PORT_TIPB,
1637 OMAP_DMA_AMODE_CONSTANT, res->start + REG_CAMDATA,
1638 0, 0);
1639 omap_set_dma_dest_burst_mode(pcdev->dma_ch, OMAP_DMA_DATA_BURST_4);
1640 /* setup DMA autoinitialization */
1641 omap_dma_link_lch(pcdev->dma_ch, pcdev->dma_ch);
1642
1643 err = request_irq(pcdev->irq, cam_isr, 0, DRIVER_NAME, pcdev);
1644 if (err) {
1645 dev_err(&pdev->dev, "Camera interrupt register failed\n");
1646 goto exit_free_dma;
1647 }
1648
1649 pcdev->soc_host.drv_name = DRIVER_NAME;
1650 pcdev->soc_host.ops = &omap1_host_ops;
1651 pcdev->soc_host.priv = pcdev;
1652 pcdev->soc_host.v4l2_dev.dev = &pdev->dev;
1653 pcdev->soc_host.nr = pdev->id;
1654
1655 err = soc_camera_host_register(&pcdev->soc_host);
1656 if (err)
1657 goto exit_free_irq;
1658
1659 dev_info(&pdev->dev, "OMAP1 Camera Interface driver loaded\n");
1660
1661 return 0;
1662
1663 exit_free_irq:
1664 free_irq(pcdev->irq, pcdev);
1665 exit_free_dma:
1666 omap_free_dma(pcdev->dma_ch);
1667 exit_iounmap:
1668 iounmap(base);
1669 exit_release:
1670 release_mem_region(res->start, resource_size(res));
1671 exit_kfree:
1672 kfree(pcdev);
1673 exit_put_clk:
1674 clk_put(clk);
1675 exit:
1676 return err;
1677 }
1678
omap1_cam_remove(struct platform_device * pdev)1679 static int omap1_cam_remove(struct platform_device *pdev)
1680 {
1681 struct soc_camera_host *soc_host = to_soc_camera_host(&pdev->dev);
1682 struct omap1_cam_dev *pcdev = container_of(soc_host,
1683 struct omap1_cam_dev, soc_host);
1684 struct resource *res;
1685
1686 free_irq(pcdev->irq, pcdev);
1687
1688 omap_free_dma(pcdev->dma_ch);
1689
1690 soc_camera_host_unregister(soc_host);
1691
1692 iounmap(pcdev->base);
1693
1694 res = pcdev->res;
1695 release_mem_region(res->start, resource_size(res));
1696
1697 clk_put(pcdev->clk);
1698
1699 kfree(pcdev);
1700
1701 dev_info(&pdev->dev, "OMAP1 Camera Interface driver unloaded\n");
1702
1703 return 0;
1704 }
1705
1706 static struct platform_driver omap1_cam_driver = {
1707 .driver = {
1708 .name = DRIVER_NAME,
1709 },
1710 .probe = omap1_cam_probe,
1711 .remove = omap1_cam_remove,
1712 };
1713
1714 module_platform_driver(omap1_cam_driver);
1715
1716 module_param(sg_mode, bool, 0644);
1717 MODULE_PARM_DESC(sg_mode, "videobuf mode, 0: dma-contig (default), 1: dma-sg");
1718
1719 MODULE_DESCRIPTION("OMAP1 Camera Interface driver");
1720 MODULE_AUTHOR("Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>");
1721 MODULE_LICENSE("GPL v2");
1722 MODULE_VERSION(DRIVER_VERSION);
1723 MODULE_ALIAS("platform:" DRIVER_NAME);
1724