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V4L/DVB (13556): v4l: Remove unneeded video_device::minor assignments
[net-next-2.6.git] / drivers / media / video / omap24xxcam.c
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39aee69a
SA		 1/*
2 * drivers/media/video/omap24xxcam.c
3 *
4 * OMAP 2 camera block driver.
5 *
6 * Copyright (C) 2004 MontaVista Software, Inc.
7 * Copyright (C) 2004 Texas Instruments.
8 * Copyright (C) 2007-2008 Nokia Corporation.
9 *
10 * Contact: Sakari Ailus <sakari.ailus@nokia.com>
11 *
12 * Based on code from Andy Lowe <source@mvista.com>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * version 2 as published by the Free Software Foundation.
17 *
18 * This program is distributed in the hope that it will be useful, but
19 * WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
26 * 02110-1301 USA
27 */
28
29#include <linux/delay.h>
30#include <linux/kernel.h>
31#include <linux/interrupt.h>
32#include <linux/videodev2.h>
33#include <linux/pci.h> /* needed for videobufs */
34#include <linux/version.h>
35#include <linux/platform_device.h>
36#include <linux/clk.h>
37#include <linux/io.h>
38
39#include <media/v4l2-common.h>
40#include <media/v4l2-ioctl.h>
41
42#include "omap24xxcam.h"
43
44#define OMAP24XXCAM_VERSION KERNEL_VERSION(0, 0, 0)
45
46#define RESET_TIMEOUT_NS 10000
47
48static void omap24xxcam_reset(struct omap24xxcam_device *cam);
49static int omap24xxcam_sensor_if_enable(struct omap24xxcam_device *cam);
50static void omap24xxcam_device_unregister(struct v4l2_int_device *s);
51static int omap24xxcam_remove(struct platform_device *pdev);
52
53/* module parameters */
54static int video_nr = -1; /* video device minor (-1 ==> auto assign) */
55/*
56 * Maximum amount of memory to use for capture buffers.
57 * Default is 4800KB, enough to double-buffer SXGA.
58 */
59static int capture_mem = 1280 * 960 * 2 * 2;
60
61static struct v4l2_int_device omap24xxcam;
62
63/*
64 *
65 * Clocks.
66 *
67 */
68
69static void omap24xxcam_clock_put(struct omap24xxcam_device *cam)
70{
71 if (cam->ick != NULL && !IS_ERR(cam->ick))
72 clk_put(cam->ick);
73 if (cam->fck != NULL && !IS_ERR(cam->fck))
74 clk_put(cam->fck);
75
76 cam->ick = cam->fck = NULL;
77}
78
79static int omap24xxcam_clock_get(struct omap24xxcam_device *cam)
80{
81 int rval = 0;
82
6c5dbb40 83 cam->fck = clk_get(cam->dev, "fck");
39aee69a 84 if (IS_ERR(cam->fck)) {
6c5dbb40 85 dev_err(cam->dev, "can't get camera fck");
39aee69a
SA		 86 rval = PTR_ERR(cam->fck);
87 omap24xxcam_clock_put(cam);
88 return rval;
89 }
90
6c5dbb40 91 cam->ick = clk_get(cam->dev, "ick");
39aee69a 92 if (IS_ERR(cam->ick)) {
6c5dbb40 93 dev_err(cam->dev, "can't get camera ick");
39aee69a
SA		 94 rval = PTR_ERR(cam->ick);
95 omap24xxcam_clock_put(cam);
96 }
97
98 return rval;
99}
100
101static void omap24xxcam_clock_on(struct omap24xxcam_device *cam)
102{
103 clk_enable(cam->fck);
104 clk_enable(cam->ick);
105}
106
107static void omap24xxcam_clock_off(struct omap24xxcam_device *cam)
108{
109 clk_disable(cam->fck);
110 clk_disable(cam->ick);
111}
112
113/*
114 *
115 * Camera core
116 *
117 */
118
119/*
120 * Set xclk.
121 *
122 * To disable xclk, use value zero.
123 */
124static void omap24xxcam_core_xclk_set(const struct omap24xxcam_device *cam,
125 u32 xclk)
126{
127 if (xclk) {
128 u32 divisor = CAM_MCLK / xclk;
129
130 if (divisor == 1)
131 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET,
132 CC_CTRL_XCLK,
133 CC_CTRL_XCLK_DIV_BYPASS);
134 else
135 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET,
136 CC_CTRL_XCLK, divisor);
137 } else
138 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET,
139 CC_CTRL_XCLK, CC_CTRL_XCLK_DIV_STABLE_LOW);
140}
141
142static void omap24xxcam_core_hwinit(const struct omap24xxcam_device *cam)
143{
144 /*
145 * Setting the camera core AUTOIDLE bit causes problems with frame
146 * synchronization, so we will clear the AUTOIDLE bit instead.
147 */
148 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_SYSCONFIG,
149 CC_SYSCONFIG_AUTOIDLE);
150
151 /* program the camera interface DMA packet size */
152 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_CTRL_DMA,
153 CC_CTRL_DMA_EN | (DMA_THRESHOLD / 4 - 1));
154
155 /* enable camera core error interrupts */
156 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_IRQENABLE,
157 CC_IRQENABLE_FW_ERR_IRQ
158 | CC_IRQENABLE_FSC_ERR_IRQ
159 | CC_IRQENABLE_SSC_ERR_IRQ
160 | CC_IRQENABLE_FIFO_OF_IRQ);
161}
162
163/*
164 * Enable the camera core.
165 *
166 * Data transfer to the camera DMA starts from next starting frame.
167 */
168static void omap24xxcam_core_enable(const struct omap24xxcam_device *cam)
169{
170
171 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_CTRL,
172 cam->cc_ctrl);
173}
174
175/*
176 * Disable camera core.
177 *
178 * The data transfer will be stopped immediately (CC_CTRL_CC_RST). The
179 * core internal state machines will be reset. Use
180 * CC_CTRL_CC_FRAME_TRIG instead if you want to transfer the current
181 * frame completely.
182 */
183static void omap24xxcam_core_disable(const struct omap24xxcam_device *cam)
184{
185 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_CTRL,
186 CC_CTRL_CC_RST);
187}
188
189/* Interrupt service routine for camera core interrupts. */
190static void omap24xxcam_core_isr(struct omap24xxcam_device *cam)
191{
192 u32 cc_irqstatus;
193 const u32 cc_irqstatus_err =
194 CC_IRQSTATUS_FW_ERR_IRQ
195 | CC_IRQSTATUS_FSC_ERR_IRQ
196 | CC_IRQSTATUS_SSC_ERR_IRQ
197 | CC_IRQSTATUS_FIFO_UF_IRQ
198 | CC_IRQSTATUS_FIFO_OF_IRQ;
199
200 cc_irqstatus = omap24xxcam_reg_in(cam->mmio_base + CC_REG_OFFSET,
201 CC_IRQSTATUS);
202 omap24xxcam_reg_out(cam->mmio_base + CC_REG_OFFSET, CC_IRQSTATUS,
203 cc_irqstatus);
204
205 if (cc_irqstatus & cc_irqstatus_err
206 && !atomic_read(&cam->in_reset)) {
207 dev_dbg(cam->dev, "resetting camera, cc_irqstatus 0x%x\n",
208 cc_irqstatus);
209 omap24xxcam_reset(cam);
210 }
211}
212
213/*
214 *
215 * videobuf_buffer handling.
216 *
217 * Memory for mmapped videobuf_buffers is not allocated
218 * conventionally, but by several kmalloc allocations and then
219 * creating the scatterlist on our own. User-space buffers are handled
220 * normally.
221 *
222 */
223
224/*
225 * Free the memory-mapped buffer memory allocated for a
226 * videobuf_buffer and the associated scatterlist.
227 */
228static void omap24xxcam_vbq_free_mmap_buffer(struct videobuf_buffer *vb)
229{
230 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
231 size_t alloc_size;
232 struct page *page;
233 int i;
234
235 if (dma->sglist == NULL)
236 return;
237
238 i = dma->sglen;
239 while (i) {
240 i--;
241 alloc_size = sg_dma_len(&dma->sglist[i]);
242 page = sg_page(&dma->sglist[i]);
243 do {
244 ClearPageReserved(page++);
245 } while (alloc_size -= PAGE_SIZE);
246 __free_pages(sg_page(&dma->sglist[i]),
247 get_order(sg_dma_len(&dma->sglist[i])));
248 }
249
250 kfree(dma->sglist);
251 dma->sglist = NULL;
252}
253
254/* Release all memory related to the videobuf_queue. */
255static void omap24xxcam_vbq_free_mmap_buffers(struct videobuf_queue *vbq)
256{
257 int i;
258
259 mutex_lock(&vbq->vb_lock);
260
261 for (i = 0; i < VIDEO_MAX_FRAME; i++) {
262 if (NULL == vbq->bufs[i])
263 continue;
264 if (V4L2_MEMORY_MMAP != vbq->bufs[i]->memory)
265 continue;
266 vbq->ops->buf_release(vbq, vbq->bufs[i]);
267 omap24xxcam_vbq_free_mmap_buffer(vbq->bufs[i]);
268 kfree(vbq->bufs[i]);
269 vbq->bufs[i] = NULL;
270 }
271
272 mutex_unlock(&vbq->vb_lock);
273
274 videobuf_mmap_free(vbq);
275}
276
277/*
278 * Allocate physically as contiguous as possible buffer for video
279 * frame and allocate and build DMA scatter-gather list for it.
280 */
281static int omap24xxcam_vbq_alloc_mmap_buffer(struct videobuf_buffer *vb)
282{
283 unsigned int order;
284 size_t alloc_size, size = vb->bsize; /* vb->bsize is page aligned */
285 struct page *page;
286 int max_pages, err = 0, i = 0;
287 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
288
289 /*
290 * allocate maximum size scatter-gather list. Note this is
291 * overhead. We may not use as many entries as we allocate
292 */
293 max_pages = vb->bsize >> PAGE_SHIFT;
294 dma->sglist = kcalloc(max_pages, sizeof(*dma->sglist), GFP_KERNEL);
295 if (dma->sglist == NULL) {
296 err = -ENOMEM;
297 goto out;
298 }
299
300 while (size) {
301 order = get_order(size);
302 /*
303 * do not over-allocate even if we would get larger
304 * contiguous chunk that way
305 */
306 if ((PAGE_SIZE << order) > size)
307 order--;
308
309 /* try to allocate as many contiguous pages as possible */
310 page = alloc_pages(GFP_KERNEL | GFP_DMA, order);
311 /* if allocation fails, try to allocate smaller amount */
312 while (page == NULL) {
313 order--;
314 page = alloc_pages(GFP_KERNEL | GFP_DMA, order);
315 if (page == NULL && !order) {
316 err = -ENOMEM;
317 goto out;
318 }
319 }
320 size -= (PAGE_SIZE << order);
321
322 /* append allocated chunk of pages into scatter-gather list */
323 sg_set_page(&dma->sglist[i], page, PAGE_SIZE << order, 0);
324 dma->sglen++;
325 i++;
326
327 alloc_size = (PAGE_SIZE << order);
328
329 /* clear pages before giving them to user space */
330 memset(page_address(page), 0, alloc_size);
331
332 /* mark allocated pages reserved */
333 do {
334 SetPageReserved(page++);
335 } while (alloc_size -= PAGE_SIZE);
336 }
337 /*
338 * REVISIT: not fully correct to assign nr_pages == sglen but
339 * video-buf is passing nr_pages for e.g. unmap_sg calls
340 */
341 dma->nr_pages = dma->sglen;
342 dma->direction = PCI_DMA_FROMDEVICE;
343
344 return 0;
345
346out:
347 omap24xxcam_vbq_free_mmap_buffer(vb);
348 return err;
349}
350
351static int omap24xxcam_vbq_alloc_mmap_buffers(struct videobuf_queue *vbq,
352 unsigned int count)
353{
354 int i, err = 0;
355 struct omap24xxcam_fh *fh =
356 container_of(vbq, struct omap24xxcam_fh, vbq);
357
358 mutex_lock(&vbq->vb_lock);
359
360 for (i = 0; i < count; i++) {
361 err = omap24xxcam_vbq_alloc_mmap_buffer(vbq->bufs[i]);
362 if (err)
363 goto out;
364 dev_dbg(fh->cam->dev, "sglen is %d for buffer %d\n",
365 videobuf_to_dma(vbq->bufs[i])->sglen, i);
366 }
367
368 mutex_unlock(&vbq->vb_lock);
369
370 return 0;
371out:
372 while (i) {
373 i--;
374 omap24xxcam_vbq_free_mmap_buffer(vbq->bufs[i]);
375 }
376
377 mutex_unlock(&vbq->vb_lock);
378
379 return err;
380}
381
382/*
383 * This routine is called from interrupt context when a scatter-gather DMA
384 * transfer of a videobuf_buffer completes.
385 */
386static void omap24xxcam_vbq_complete(struct omap24xxcam_sgdma *sgdma,
387 u32 csr, void *arg)
388{
389 struct omap24xxcam_device *cam =
390 container_of(sgdma, struct omap24xxcam_device, sgdma);
391 struct omap24xxcam_fh *fh = cam->streaming->private_data;
392 struct videobuf_buffer *vb = (struct videobuf_buffer *)arg;
393 const u32 csr_error = CAMDMA_CSR_MISALIGNED_ERR
394 | CAMDMA_CSR_SUPERVISOR_ERR | CAMDMA_CSR_SECURE_ERR
395 | CAMDMA_CSR_TRANS_ERR | CAMDMA_CSR_DROP;
396 unsigned long flags;
397
398 spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
399 if (--cam->sgdma_in_queue == 0)
400 omap24xxcam_core_disable(cam);
401 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
402
403 do_gettimeofday(&vb->ts);
404 vb->field_count = atomic_add_return(2, &fh->field_count);
405 if (csr & csr_error) {
406 vb->state = VIDEOBUF_ERROR;
407 if (!atomic_read(&fh->cam->in_reset)) {
408 dev_dbg(cam->dev, "resetting camera, csr 0x%x\n", csr);
409 omap24xxcam_reset(cam);
410 }
411 } else
412 vb->state = VIDEOBUF_DONE;
413 wake_up(&vb->done);
414}
415
416static void omap24xxcam_vbq_release(struct videobuf_queue *vbq,
417 struct videobuf_buffer *vb)
418{
419 struct videobuf_dmabuf *dma = videobuf_to_dma(vb);
420
421 /* wait for buffer, especially to get out of the sgdma queue */
422 videobuf_waiton(vb, 0, 0);
423 if (vb->memory == V4L2_MEMORY_MMAP) {
424 dma_unmap_sg(vbq->dev, dma->sglist, dma->sglen,
425 dma->direction);
426 dma->direction = DMA_NONE;
427 } else {
428 videobuf_dma_unmap(vbq, videobuf_to_dma(vb));
429 videobuf_dma_free(videobuf_to_dma(vb));
430 }
431
432 vb->state = VIDEOBUF_NEEDS_INIT;
433}
434
435/*
436 * Limit the number of available kernel image capture buffers based on the
437 * number requested, the currently selected image size, and the maximum
438 * amount of memory permitted for kernel capture buffers.
439 */
440static int omap24xxcam_vbq_setup(struct videobuf_queue *vbq, unsigned int *cnt,
441 unsigned int *size)
442{
443 struct omap24xxcam_fh *fh = vbq->priv_data;
444
445 if (*cnt <= 0)
446 *cnt = VIDEO_MAX_FRAME; /* supply a default number of buffers */
447
448 if (*cnt > VIDEO_MAX_FRAME)
449 *cnt = VIDEO_MAX_FRAME;
450
451 *size = fh->pix.sizeimage;
452
453 /* accessing fh->cam->capture_mem is ok, it's constant */
454 while (*size * *cnt > fh->cam->capture_mem)
455 (*cnt)--;
456
457 return 0;
458}
459
460static int omap24xxcam_dma_iolock(struct videobuf_queue *vbq,
461 struct videobuf_dmabuf *dma)
462{
463 int err = 0;
464
465 dma->direction = PCI_DMA_FROMDEVICE;
466 if (!dma_map_sg(vbq->dev, dma->sglist, dma->sglen, dma->direction)) {
467 kfree(dma->sglist);
468 dma->sglist = NULL;
469 dma->sglen = 0;
470 err = -EIO;
471 }
472
473 return err;
474}
475
476static int omap24xxcam_vbq_prepare(struct videobuf_queue *vbq,
477 struct videobuf_buffer *vb,
478 enum v4l2_field field)
479{
480 struct omap24xxcam_fh *fh = vbq->priv_data;
481 int err = 0;
482
483 /*
484 * Accessing pix here is okay since it's constant while
485 * streaming is on (and we only get called then).
486 */
487 if (vb->baddr) {
488 /* This is a userspace buffer. */
489 if (fh->pix.sizeimage > vb->bsize) {
490 /* The buffer isn't big enough. */
491 err = -EINVAL;
492 } else
493 vb->size = fh->pix.sizeimage;
494 } else {
495 if (vb->state != VIDEOBUF_NEEDS_INIT) {
496 /*
497 * We have a kernel bounce buffer that has
498 * already been allocated.
499 */
500 if (fh->pix.sizeimage > vb->size) {
501 /*
502 * The image size has been changed to
503 * a larger size since this buffer was
504 * allocated, so we need to free and
505 * reallocate it.
506 */
507 omap24xxcam_vbq_release(vbq, vb);
508 vb->size = fh->pix.sizeimage;
509 }
510 } else {
511 /* We need to allocate a new kernel bounce buffer. */
512 vb->size = fh->pix.sizeimage;
513 }
514 }
515
516 if (err)
517 return err;
518
519 vb->width = fh->pix.width;
520 vb->height = fh->pix.height;
521 vb->field = field;
522
523 if (vb->state == VIDEOBUF_NEEDS_INIT) {
524 if (vb->memory == V4L2_MEMORY_MMAP)
525 /*
526 * we have built the scatter-gather list by ourself so
527 * do the scatter-gather mapping as well
528 */
529 err = omap24xxcam_dma_iolock(vbq, videobuf_to_dma(vb));
530 else
531 err = videobuf_iolock(vbq, vb, NULL);
532 }
533
534 if (!err)
535 vb->state = VIDEOBUF_PREPARED;
536 else
537 omap24xxcam_vbq_release(vbq, vb);
538
539 return err;
540}
541
542static void omap24xxcam_vbq_queue(struct videobuf_queue *vbq,
543 struct videobuf_buffer *vb)
544{
545 struct omap24xxcam_fh *fh = vbq->priv_data;
546 struct omap24xxcam_device *cam = fh->cam;
547 enum videobuf_state state = vb->state;
548 unsigned long flags;
549 int err;
550
551 /*
552 * FIXME: We're marking the buffer active since we have no
553 * pretty way of marking it active exactly when the
554 * scatter-gather transfer starts.
555 */
556 vb->state = VIDEOBUF_ACTIVE;
557
558 err = omap24xxcam_sgdma_queue(&fh->cam->sgdma,
559 videobuf_to_dma(vb)->sglist,
560 videobuf_to_dma(vb)->sglen, vb->size,
561 omap24xxcam_vbq_complete, vb);
562
563 if (!err) {
564 spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
565 if (++cam->sgdma_in_queue == 1
566 && !atomic_read(&cam->in_reset))
567 omap24xxcam_core_enable(cam);
568 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
569 } else {
570 /*
571 * Oops. We're not supposed to get any errors here.
572 * The only way we could get an error is if we ran out
573 * of scatter-gather DMA slots, but we are supposed to
574 * have at least as many scatter-gather DMA slots as
575 * video buffers so that can't happen.
576 */
577 dev_err(cam->dev, "failed to queue a video buffer for dma!\n");
578 dev_err(cam->dev, "likely a bug in the driver!\n");
579 vb->state = state;
580 }
581}
582
583static struct videobuf_queue_ops omap24xxcam_vbq_ops = {
584 .buf_setup = omap24xxcam_vbq_setup,
585 .buf_prepare = omap24xxcam_vbq_prepare,
586 .buf_queue = omap24xxcam_vbq_queue,
587 .buf_release = omap24xxcam_vbq_release,
588};
589
590/*
591 *
592 * OMAP main camera system
593 *
594 */
595
596/*
597 * Reset camera block to power-on state.
598 */
599static void omap24xxcam_poweron_reset(struct omap24xxcam_device *cam)
600{
601 int max_loop = RESET_TIMEOUT_NS;
602
603 /* Reset whole camera subsystem */
604 omap24xxcam_reg_out(cam->mmio_base,
605 CAM_SYSCONFIG,
606 CAM_SYSCONFIG_SOFTRESET);
607
608 /* Wait till it's finished */
609 while (!(omap24xxcam_reg_in(cam->mmio_base, CAM_SYSSTATUS)
610 & CAM_SYSSTATUS_RESETDONE)
611 && --max_loop) {
612 ndelay(1);
613 }
614
615 if (!(omap24xxcam_reg_in(cam->mmio_base, CAM_SYSSTATUS)
616 & CAM_SYSSTATUS_RESETDONE))
617 dev_err(cam->dev, "camera soft reset timeout\n");
618}
619
620/*
621 * (Re)initialise the camera block.
622 */
623static void omap24xxcam_hwinit(struct omap24xxcam_device *cam)
624{
625 omap24xxcam_poweron_reset(cam);
626
627 /* set the camera subsystem autoidle bit */
628 omap24xxcam_reg_out(cam->mmio_base, CAM_SYSCONFIG,
629 CAM_SYSCONFIG_AUTOIDLE);
630
631 /* set the camera MMU autoidle bit */
632 omap24xxcam_reg_out(cam->mmio_base,
633 CAMMMU_REG_OFFSET + CAMMMU_SYSCONFIG,
634 CAMMMU_SYSCONFIG_AUTOIDLE);
635
636 omap24xxcam_core_hwinit(cam);
637
638 omap24xxcam_dma_hwinit(&cam->sgdma.dma);
639}
640
641/*
642 * Callback for dma transfer stalling.
643 */
644static void omap24xxcam_stalled_dma_reset(unsigned long data)
645{
646 struct omap24xxcam_device *cam = (struct omap24xxcam_device *)data;
647
648 if (!atomic_read(&cam->in_reset)) {
649 dev_dbg(cam->dev, "dma stalled, resetting camera\n");
650 omap24xxcam_reset(cam);
651 }
652}
653
654/*
655 * Stop capture. Mark we're doing a reset, stop DMA transfers and
656 * core. (No new scatter-gather transfers will be queued whilst
657 * in_reset is non-zero.)
658 *
659 * If omap24xxcam_capture_stop is called from several places at
660 * once, only the first call will have an effect. Similarly, the last
661 * call omap24xxcam_streaming_cont will have effect.
662 *
663 * Serialisation is ensured by using cam->core_enable_disable_lock.
664 */
665static void omap24xxcam_capture_stop(struct omap24xxcam_device *cam)
666{
667 unsigned long flags;
668
669 spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
670
671 if (atomic_inc_return(&cam->in_reset) != 1) {
672 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
673 return;
674 }
675
676 omap24xxcam_core_disable(cam);
677
678 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
679
680 omap24xxcam_sgdma_sync(&cam->sgdma);
681}
682
683/*
684 * Reset and continue streaming.
685 *
686 * Note: Resetting the camera FIFO via the CC_RST bit in the CC_CTRL
687 * register is supposed to be sufficient to recover from a camera
688 * interface error, but it doesn't seem to be enough. If we only do
689 * that then subsequent image captures are out of sync by either one
690 * or two times DMA_THRESHOLD bytes. Resetting and re-initializing the
691 * entire camera subsystem prevents the problem with frame
692 * synchronization.
693 */
694static void omap24xxcam_capture_cont(struct omap24xxcam_device *cam)
695{
696 unsigned long flags;
697
698 spin_lock_irqsave(&cam->core_enable_disable_lock, flags);
699
700 if (atomic_read(&cam->in_reset) != 1)
701 goto out;
702
703 omap24xxcam_hwinit(cam);
704
705 omap24xxcam_sensor_if_enable(cam);
706
707 omap24xxcam_sgdma_process(&cam->sgdma);
708
709 if (cam->sgdma_in_queue)
710 omap24xxcam_core_enable(cam);
711
712out:
713 atomic_dec(&cam->in_reset);
714 spin_unlock_irqrestore(&cam->core_enable_disable_lock, flags);
715}
716
717static ssize_t
718omap24xxcam_streaming_show(struct device *dev, struct device_attribute *attr,
719 char *buf)
720{
721 struct omap24xxcam_device *cam = dev_get_drvdata(dev);
722
723 return sprintf(buf, "%s\n", cam->streaming ? "active" : "inactive");
724}
725static DEVICE_ATTR(streaming, S_IRUGO, omap24xxcam_streaming_show, NULL);
726
727/*
728 * Stop capture and restart it. I.e. reset the camera during use.
729 */
730static void omap24xxcam_reset(struct omap24xxcam_device *cam)
731{
732 omap24xxcam_capture_stop(cam);
733 omap24xxcam_capture_cont(cam);
734}
735
736/*
737 * The main interrupt handler.
738 */
739static irqreturn_t omap24xxcam_isr(int irq, void *arg)
740{
741 struct omap24xxcam_device *cam = (struct omap24xxcam_device *)arg;
742 u32 irqstatus;
743 unsigned int irqhandled = 0;
744
745 irqstatus = omap24xxcam_reg_in(cam->mmio_base, CAM_IRQSTATUS);
746
747 if (irqstatus &
748 (CAM_IRQSTATUS_DMA_IRQ2 | CAM_IRQSTATUS_DMA_IRQ1
749 | CAM_IRQSTATUS_DMA_IRQ0)) {
750 omap24xxcam_dma_isr(&cam->sgdma.dma);
751 irqhandled = 1;
752 }
753 if (irqstatus & CAM_IRQSTATUS_CC_IRQ) {
754 omap24xxcam_core_isr(cam);
755 irqhandled = 1;
756 }
757 if (irqstatus & CAM_IRQSTATUS_MMU_IRQ)
758 dev_err(cam->dev, "unhandled camera MMU interrupt!\n");
759
760 return IRQ_RETVAL(irqhandled);
761}
762
763/*
764 *
765 * Sensor handling.
766 *
767 */
768
769/*
770 * Enable the external sensor interface. Try to negotiate interface
771 * parameters with the sensor and start using the new ones. The calls
772 * to sensor_if_enable and sensor_if_disable need not to be balanced.
773 */
774static int omap24xxcam_sensor_if_enable(struct omap24xxcam_device *cam)
775{
776 int rval;
777 struct v4l2_ifparm p;
778
779 rval = vidioc_int_g_ifparm(cam->sdev, &p);
780 if (rval) {
781 dev_err(cam->dev, "vidioc_int_g_ifparm failed with %d\n", rval);
782 return rval;
783 }
784
785 cam->if_type = p.if_type;
786
787 cam->cc_ctrl = CC_CTRL_CC_EN;
788
789 switch (p.if_type) {
790 case V4L2_IF_TYPE_BT656:
791 if (p.u.bt656.frame_start_on_rising_vs)
792 cam->cc_ctrl |= CC_CTRL_NOBT_SYNCHRO;
793 if (p.u.bt656.bt_sync_correct)
794 cam->cc_ctrl |= CC_CTRL_BT_CORRECT;
795 if (p.u.bt656.swap)
796 cam->cc_ctrl |= CC_CTRL_PAR_ORDERCAM;
797 if (p.u.bt656.latch_clk_inv)
798 cam->cc_ctrl |= CC_CTRL_PAR_CLK_POL;
799 if (p.u.bt656.nobt_hs_inv)
800 cam->cc_ctrl |= CC_CTRL_NOBT_HS_POL;
801 if (p.u.bt656.nobt_vs_inv)
802 cam->cc_ctrl |= CC_CTRL_NOBT_VS_POL;
803
804 switch (p.u.bt656.mode) {
805 case V4L2_IF_TYPE_BT656_MODE_NOBT_8BIT:
806 cam->cc_ctrl |= CC_CTRL_PAR_MODE_NOBT8;
807 break;
808 case V4L2_IF_TYPE_BT656_MODE_NOBT_10BIT:
809 cam->cc_ctrl |= CC_CTRL_PAR_MODE_NOBT10;
810 break;
811 case V4L2_IF_TYPE_BT656_MODE_NOBT_12BIT:
812 cam->cc_ctrl |= CC_CTRL_PAR_MODE_NOBT12;
813 break;
814 case V4L2_IF_TYPE_BT656_MODE_BT_8BIT:
815 cam->cc_ctrl |= CC_CTRL_PAR_MODE_BT8;
816 break;
817 case V4L2_IF_TYPE_BT656_MODE_BT_10BIT:
818 cam->cc_ctrl |= CC_CTRL_PAR_MODE_BT10;
819 break;
820 default:
821 dev_err(cam->dev,
822 "bt656 interface mode %d not supported\n",
823 p.u.bt656.mode);
824 return -EINVAL;
825 }
826 /*
827 * The clock rate that the sensor wants has changed.
828 * We have to adjust the xclk from OMAP 2 side to
829 * match the sensor's wish as closely as possible.
830 */
831 if (p.u.bt656.clock_curr != cam->if_u.bt656.xclk) {
832 u32 xclk = p.u.bt656.clock_curr;
833 u32 divisor;
834
835 if (xclk == 0)
836 return -EINVAL;
837
838 if (xclk > CAM_MCLK)
839 xclk = CAM_MCLK;
840
841 divisor = CAM_MCLK / xclk;
842 if (divisor * xclk < CAM_MCLK)
843 divisor++;
844 if (CAM_MCLK / divisor < p.u.bt656.clock_min
845 && divisor > 1)
846 divisor--;
847 if (divisor > 30)
848 divisor = 30;
849
850 xclk = CAM_MCLK / divisor;
851
852 if (xclk < p.u.bt656.clock_min
853 || xclk > p.u.bt656.clock_max)
854 return -EINVAL;
855
856 cam->if_u.bt656.xclk = xclk;
857 }
858 omap24xxcam_core_xclk_set(cam, cam->if_u.bt656.xclk);
859 break;
860 default:
861 /* FIXME: how about other interfaces? */
862 dev_err(cam->dev, "interface type %d not supported\n",
863 p.if_type);
864 return -EINVAL;
865 }
866
867 return 0;
868}
869
870static void omap24xxcam_sensor_if_disable(const struct omap24xxcam_device *cam)
871{
872 switch (cam->if_type) {
873 case V4L2_IF_TYPE_BT656:
874 omap24xxcam_core_xclk_set(cam, 0);
875 break;
876 }
877}
878
879/*
880 * Initialise the sensor hardware.
881 */
882static int omap24xxcam_sensor_init(struct omap24xxcam_device *cam)
883{
884 int err = 0;
885 struct v4l2_int_device *sdev = cam->sdev;
886
887 omap24xxcam_clock_on(cam);
888 err = omap24xxcam_sensor_if_enable(cam);
889 if (err) {
890 dev_err(cam->dev, "sensor interface could not be enabled at "
891 "initialisation, %d\n", err);
892 cam->sdev = NULL;
893 goto out;
894 }
895
896 /* power up sensor during sensor initialization */
897 vidioc_int_s_power(sdev, 1);
898
899 err = vidioc_int_dev_init(sdev);
900 if (err) {
901 dev_err(cam->dev, "cannot initialize sensor, error %d\n", err);
902 /* Sensor init failed --- it's nonexistent to us! */
903 cam->sdev = NULL;
904 goto out;
905 }
906
907 dev_info(cam->dev, "sensor is %s\n", sdev->name);
908
909out:
910 omap24xxcam_sensor_if_disable(cam);
911 omap24xxcam_clock_off(cam);
912
913 vidioc_int_s_power(sdev, 0);
914
915 return err;
916}
917
918static void omap24xxcam_sensor_exit(struct omap24xxcam_device *cam)
919{
920 if (cam->sdev)
921 vidioc_int_dev_exit(cam->sdev);
922}
923
924static void omap24xxcam_sensor_disable(struct omap24xxcam_device *cam)
925{
926 omap24xxcam_sensor_if_disable(cam);
927 omap24xxcam_clock_off(cam);
928 vidioc_int_s_power(cam->sdev, 0);
929}
930
931/*
932 * Power-up and configure camera sensor. It's ready for capturing now.
933 */
934static int omap24xxcam_sensor_enable(struct omap24xxcam_device *cam)
935{
936 int rval;
937
938 omap24xxcam_clock_on(cam);
939
940 omap24xxcam_sensor_if_enable(cam);
941
942 rval = vidioc_int_s_power(cam->sdev, 1);
943 if (rval)
944 goto out;
945
946 rval = vidioc_int_init(cam->sdev);
947 if (rval)
948 goto out;
949
950 return 0;
951
952out:
953 omap24xxcam_sensor_disable(cam);
954
955 return rval;
956}
957
958static void omap24xxcam_sensor_reset_work(struct work_struct *work)
959{
960 struct omap24xxcam_device *cam =
961 container_of(work, struct omap24xxcam_device,
962 sensor_reset_work);
963
964 if (atomic_read(&cam->reset_disable))
965 return;
966
967 omap24xxcam_capture_stop(cam);
968
969 if (vidioc_int_reset(cam->sdev) == 0) {
970 vidioc_int_init(cam->sdev);
971 } else {
972 /* Can't reset it by vidioc_int_reset. */
973 omap24xxcam_sensor_disable(cam);
974 omap24xxcam_sensor_enable(cam);
975 }
976
977 omap24xxcam_capture_cont(cam);
978}
979
980/*
981 *
982 * IOCTL interface.
983 *
984 */
985
986static int vidioc_querycap(struct file *file, void *fh,
987 struct v4l2_capability *cap)
988{
989 struct omap24xxcam_fh *ofh = fh;
990 struct omap24xxcam_device *cam = ofh->cam;
991
992 strlcpy(cap->driver, CAM_NAME, sizeof(cap->driver));
993 strlcpy(cap->card, cam->vfd->name, sizeof(cap->card));
994 cap->version = OMAP24XXCAM_VERSION;
995 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
996
997 return 0;
998}
999
1000static int vidioc_enum_fmt_vid_cap(struct file *file, void *fh,
1001 struct v4l2_fmtdesc *f)
1002{
1003 struct omap24xxcam_fh *ofh = fh;
1004 struct omap24xxcam_device *cam = ofh->cam;
1005 int rval;
1006
1007 rval = vidioc_int_enum_fmt_cap(cam->sdev, f);
1008
1009 return rval;
1010}
1011
1012static int vidioc_g_fmt_vid_cap(struct file *file, void *fh,
1013 struct v4l2_format *f)
1014{
1015 struct omap24xxcam_fh *ofh = fh;
1016 struct omap24xxcam_device *cam = ofh->cam;
1017 int rval;
1018
1019 mutex_lock(&cam->mutex);
1020 rval = vidioc_int_g_fmt_cap(cam->sdev, f);
1021 mutex_unlock(&cam->mutex);
1022
1023 return rval;
1024}
1025
1026static int vidioc_s_fmt_vid_cap(struct file *file, void *fh,
1027 struct v4l2_format *f)
1028{
1029 struct omap24xxcam_fh *ofh = fh;
1030 struct omap24xxcam_device *cam = ofh->cam;
1031 int rval;
1032
1033 mutex_lock(&cam->mutex);
1034 if (cam->streaming) {
1035 rval = -EBUSY;
1036 goto out;
1037 }
1038
1039 rval = vidioc_int_s_fmt_cap(cam->sdev, f);
1040
1041out:
1042 mutex_unlock(&cam->mutex);
1043
1044 if (!rval) {
1045 mutex_lock(&ofh->vbq.vb_lock);
1046 ofh->pix = f->fmt.pix;
1047 mutex_unlock(&ofh->vbq.vb_lock);
1048 }
1049
1050 memset(f, 0, sizeof(*f));
1051 vidioc_g_fmt_vid_cap(file, fh, f);
1052
1053 return rval;
1054}
1055
1056static int vidioc_try_fmt_vid_cap(struct file *file, void *fh,
1057 struct v4l2_format *f)
1058{
1059 struct omap24xxcam_fh *ofh = fh;
1060 struct omap24xxcam_device *cam = ofh->cam;
1061 int rval;
1062
1063 mutex_lock(&cam->mutex);
1064 rval = vidioc_int_try_fmt_cap(cam->sdev, f);
1065 mutex_unlock(&cam->mutex);
1066
1067 return rval;
1068}
1069
1070static int vidioc_reqbufs(struct file *file, void *fh,
1071 struct v4l2_requestbuffers *b)
1072{
1073 struct omap24xxcam_fh *ofh = fh;
1074 struct omap24xxcam_device *cam = ofh->cam;
1075 int rval;
1076
1077 mutex_lock(&cam->mutex);
1078 if (cam->streaming) {
1079 mutex_unlock(&cam->mutex);
1080 return -EBUSY;
1081 }
1082
1083 omap24xxcam_vbq_free_mmap_buffers(&ofh->vbq);
1084 mutex_unlock(&cam->mutex);
1085
1086 rval = videobuf_reqbufs(&ofh->vbq, b);
1087
1088 /*
1089 * Either videobuf_reqbufs failed or the buffers are not
1090 * memory-mapped (which would need special attention).
1091 */
1092 if (rval < 0 || b->memory != V4L2_MEMORY_MMAP)
1093 goto out;
1094
1095 rval = omap24xxcam_vbq_alloc_mmap_buffers(&ofh->vbq, rval);
1096 if (rval)
1097 omap24xxcam_vbq_free_mmap_buffers(&ofh->vbq);
1098
1099out:
1100 return rval;
1101}
1102
1103static int vidioc_querybuf(struct file *file, void *fh,
1104 struct v4l2_buffer *b)
1105{
1106 struct omap24xxcam_fh *ofh = fh;
1107
1108 return videobuf_querybuf(&ofh->vbq, b);
1109}
1110
1111static int vidioc_qbuf(struct file *file, void *fh, struct v4l2_buffer *b)
1112{
1113 struct omap24xxcam_fh *ofh = fh;
1114
1115 return videobuf_qbuf(&ofh->vbq, b);
1116}
1117
1118static int vidioc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *b)
1119{
1120 struct omap24xxcam_fh *ofh = fh;
1121 struct omap24xxcam_device *cam = ofh->cam;
1122 struct videobuf_buffer *vb;
1123 int rval;
1124
1125videobuf_dqbuf_again:
1126 rval = videobuf_dqbuf(&ofh->vbq, b, file->f_flags & O_NONBLOCK);
1127 if (rval)
1128 goto out;
1129
1130 vb = ofh->vbq.bufs[b->index];
1131
1132 mutex_lock(&cam->mutex);
1133 /* _needs_reset returns -EIO if reset is required. */
1134 rval = vidioc_int_g_needs_reset(cam->sdev, (void *)vb->baddr);
1135 mutex_unlock(&cam->mutex);
1136 if (rval == -EIO)
1137 schedule_work(&cam->sensor_reset_work);
1138 else
1139 rval = 0;
1140
1141out:
1142 /*
1143 * This is a hack. We don't want to show -EIO to the user
1144 * space. Requeue the buffer and try again if we're not doing
1145 * this in non-blocking mode.
1146 */
1147 if (rval == -EIO) {
1148 videobuf_qbuf(&ofh->vbq, b);
1149 if (!(file->f_flags & O_NONBLOCK))
1150 goto videobuf_dqbuf_again;
1151 /*
1152 * We don't have a videobuf_buffer now --- maybe next
1153 * time...
1154 */
1155 rval = -EAGAIN;
1156 }
1157
1158 return rval;
1159}
1160
1161static int vidioc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
1162{
1163 struct omap24xxcam_fh *ofh = fh;
1164 struct omap24xxcam_device *cam = ofh->cam;
1165 int rval;
1166
1167 mutex_lock(&cam->mutex);
1168 if (cam->streaming) {
1169 rval = -EBUSY;
1170 goto out;
1171 }
1172
1173 rval = omap24xxcam_sensor_if_enable(cam);
1174 if (rval) {
1175 dev_dbg(cam->dev, "vidioc_int_g_ifparm failed\n");
1176 goto out;
1177 }
1178
1179 rval = videobuf_streamon(&ofh->vbq);
1180 if (!rval) {
1181 cam->streaming = file;
1182 sysfs_notify(&cam->dev->kobj, NULL, "streaming");
1183 }
1184
1185out:
1186 mutex_unlock(&cam->mutex);
1187
1188 return rval;
1189}
1190
1191static int vidioc_streamoff(struct file *file, void *fh, enum v4l2_buf_type i)
1192{
1193 struct omap24xxcam_fh *ofh = fh;
1194 struct omap24xxcam_device *cam = ofh->cam;
1195 struct videobuf_queue *q = &ofh->vbq;
1196 int rval;
1197
1198 atomic_inc(&cam->reset_disable);
1199
1200 flush_scheduled_work();
1201
1202 rval = videobuf_streamoff(q);
1203 if (!rval) {
1204 mutex_lock(&cam->mutex);
1205 cam->streaming = NULL;
1206 mutex_unlock(&cam->mutex);
1207 sysfs_notify(&cam->dev->kobj, NULL, "streaming");
1208 }
1209
1210 atomic_dec(&cam->reset_disable);
1211
1212 return rval;
1213}
1214
1215static int vidioc_enum_input(struct file *file, void *fh,
1216 struct v4l2_input *inp)
1217{
1218 if (inp->index > 0)
1219 return -EINVAL;
1220
1221 strlcpy(inp->name, "camera", sizeof(inp->name));
1222 inp->type = V4L2_INPUT_TYPE_CAMERA;
1223
1224 return 0;
1225}
1226
1227static int vidioc_g_input(struct file *file, void *fh, unsigned int *i)
1228{
1229 *i = 0;
1230
1231 return 0;
1232}
1233
1234static int vidioc_s_input(struct file *file, void *fh, unsigned int i)
1235{
1236 if (i > 0)
1237 return -EINVAL;
1238
1239 return 0;
1240}
1241
1242static int vidioc_queryctrl(struct file *file, void *fh,
1243 struct v4l2_queryctrl *a)
1244{
1245 struct omap24xxcam_fh *ofh = fh;
1246 struct omap24xxcam_device *cam = ofh->cam;
1247 int rval;
1248
1249 rval = vidioc_int_queryctrl(cam->sdev, a);
1250
1251 return rval;
1252}
1253
1254static int vidioc_g_ctrl(struct file *file, void *fh,
1255 struct v4l2_control *a)
1256{
1257 struct omap24xxcam_fh *ofh = fh;
1258 struct omap24xxcam_device *cam = ofh->cam;
1259 int rval;
1260
1261 mutex_lock(&cam->mutex);
1262 rval = vidioc_int_g_ctrl(cam->sdev, a);
1263 mutex_unlock(&cam->mutex);
1264
1265 return rval;
1266}
1267
1268static int vidioc_s_ctrl(struct file *file, void *fh,
1269 struct v4l2_control *a)
1270{
1271 struct omap24xxcam_fh *ofh = fh;
1272 struct omap24xxcam_device *cam = ofh->cam;
1273 int rval;
1274
1275 mutex_lock(&cam->mutex);
1276 rval = vidioc_int_s_ctrl(cam->sdev, a);
1277 mutex_unlock(&cam->mutex);
1278
1279 return rval;
1280}
1281
1282static int vidioc_g_parm(struct file *file, void *fh,
1283 struct v4l2_streamparm *a) {
1284 struct omap24xxcam_fh *ofh = fh;
1285 struct omap24xxcam_device *cam = ofh->cam;
1286 int rval;
1287
39aee69a
SA		 1288 mutex_lock(&cam->mutex);
1289 rval = vidioc_int_g_parm(cam->sdev, a);
1290 mutex_unlock(&cam->mutex);
1291
1292 return rval;
1293}
1294
1295static int vidioc_s_parm(struct file *file, void *fh,
1296 struct v4l2_streamparm *a)
1297{
1298 struct omap24xxcam_fh *ofh = fh;
1299 struct omap24xxcam_device *cam = ofh->cam;
1300 struct v4l2_streamparm old_streamparm;
1301 int rval;
1302
39aee69a
SA		 1303 mutex_lock(&cam->mutex);
1304 if (cam->streaming) {
1305 rval = -EBUSY;
1306 goto out;
1307 }
1308
1309 old_streamparm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
1310 rval = vidioc_int_g_parm(cam->sdev, &old_streamparm);
1311 if (rval)
1312 goto out;
1313
1314 rval = vidioc_int_s_parm(cam->sdev, a);
1315 if (rval)
1316 goto out;
1317
1318 rval = omap24xxcam_sensor_if_enable(cam);
1319 /*
1320 * Revert to old streaming parameters if enabling sensor
1321 * interface with the new ones failed.
1322 */
1323 if (rval)
1324 vidioc_int_s_parm(cam->sdev, &old_streamparm);
1325
1326out:
1327 mutex_unlock(&cam->mutex);
1328
1329 return rval;
1330}
1331
1332/*
1333 *
1334 * File operations.
1335 *
1336 */
1337
1338static unsigned int omap24xxcam_poll(struct file *file,
1339 struct poll_table_struct *wait)
1340{
1341 struct omap24xxcam_fh *fh = file->private_data;
1342 struct omap24xxcam_device *cam = fh->cam;
1343 struct videobuf_buffer *vb;
1344
1345 mutex_lock(&cam->mutex);
1346 if (cam->streaming != file) {
1347 mutex_unlock(&cam->mutex);
1348 return POLLERR;
1349 }
1350 mutex_unlock(&cam->mutex);
1351
1352 mutex_lock(&fh->vbq.vb_lock);
1353 if (list_empty(&fh->vbq.stream)) {
1354 mutex_unlock(&fh->vbq.vb_lock);
1355 return POLLERR;
1356 }
1357 vb = list_entry(fh->vbq.stream.next, struct videobuf_buffer, stream);
1358 mutex_unlock(&fh->vbq.vb_lock);
1359
1360 poll_wait(file, &vb->done, wait);
1361
1362 if (vb->state == VIDEOBUF_DONE || vb->state == VIDEOBUF_ERROR)
1363 return POLLIN | POLLRDNORM;
1364
1365 return 0;
1366}
1367
1368static int omap24xxcam_mmap_buffers(struct file *file,
1369 struct vm_area_struct *vma)
1370{
1371 struct omap24xxcam_fh *fh = file->private_data;
1372 struct omap24xxcam_device *cam = fh->cam;
1373 struct videobuf_queue *vbq = &fh->vbq;
1374 unsigned int first, last, size, i, j;
1375 int err = 0;
1376
1377 mutex_lock(&cam->mutex);
1378 if (cam->streaming) {
1379 mutex_unlock(&cam->mutex);
1380 return -EBUSY;
1381 }
1382 mutex_unlock(&cam->mutex);
1383 mutex_lock(&vbq->vb_lock);
1384
1385 /* look for first buffer to map */
1386 for (first = 0; first < VIDEO_MAX_FRAME; first++) {
1387 if (NULL == vbq->bufs[first])
1388 continue;
1389 if (V4L2_MEMORY_MMAP != vbq->bufs[first]->memory)
1390 continue;
1391 if (vbq->bufs[first]->boff == (vma->vm_pgoff << PAGE_SHIFT))
1392 break;
1393 }
1394
1395 /* look for last buffer to map */
1396 for (size = 0, last = first; last < VIDEO_MAX_FRAME; last++) {
1397 if (NULL == vbq->bufs[last])
1398 continue;
1399 if (V4L2_MEMORY_MMAP != vbq->bufs[last]->memory)
1400 continue;
1401 size += vbq->bufs[last]->bsize;
1402 if (size == (vma->vm_end - vma->vm_start))
1403 break;
1404 }
1405
1406 size = 0;
1407 for (i = first; i <= last; i++) {
1408 struct videobuf_dmabuf *dma = videobuf_to_dma(vbq->bufs[i]);
1409
1410 for (j = 0; j < dma->sglen; j++) {
1411 err = remap_pfn_range(
1412 vma, vma->vm_start + size,
1413 page_to_pfn(sg_page(&dma->sglist[j])),
1414 sg_dma_len(&dma->sglist[j]), vma->vm_page_prot);
1415 if (err)
1416 goto out;
1417 size += sg_dma_len(&dma->sglist[j]);
1418 }
1419 }
1420
1421out:
1422 mutex_unlock(&vbq->vb_lock);
1423
1424 return err;
1425}
1426
1427static int omap24xxcam_mmap(struct file *file, struct vm_area_struct *vma)
1428{
1429 struct omap24xxcam_fh *fh = file->private_data;
1430 int rval;
1431
1432 /* let the video-buf mapper check arguments and set-up structures */
1433 rval = videobuf_mmap_mapper(&fh->vbq, vma);
1434 if (rval)
1435 return rval;
1436
1437 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
1438
1439 /* do mapping to our allocated buffers */
1440 rval = omap24xxcam_mmap_buffers(file, vma);
1441 /*
1442 * In case of error, free vma->vm_private_data allocated by
1443 * videobuf_mmap_mapper.
1444 */
1445 if (rval)
1446 kfree(vma->vm_private_data);
1447
1448 return rval;
1449}
1450
bec43661 1451static int omap24xxcam_open(struct file *file)
39aee69a 1452{
bec43661 1453 int minor = video_devdata(file)->minor;
39aee69a
SA		 1454 struct omap24xxcam_device *cam = omap24xxcam.priv;
1455 struct omap24xxcam_fh *fh;
1456 struct v4l2_format format;
1457
1458 if (!cam || !cam->vfd || (cam->vfd->minor != minor))
1459 return -ENODEV;
1460
1461 fh = kzalloc(sizeof(*fh), GFP_KERNEL);
1462 if (fh == NULL)
1463 return -ENOMEM;
1464
1465 mutex_lock(&cam->mutex);
1466 if (cam->sdev == NULL || !try_module_get(cam->sdev->module)) {
1467 mutex_unlock(&cam->mutex);
1468 goto out_try_module_get;
1469 }
1470
1471 if (atomic_inc_return(&cam->users) == 1) {
1472 omap24xxcam_hwinit(cam);
1473 if (omap24xxcam_sensor_enable(cam)) {
1474 mutex_unlock(&cam->mutex);
1475 goto out_omap24xxcam_sensor_enable;
1476 }
1477 }
1478 mutex_unlock(&cam->mutex);
1479
1480 fh->cam = cam;
1481 mutex_lock(&cam->mutex);
1482 vidioc_int_g_fmt_cap(cam->sdev, &format);
1483 mutex_unlock(&cam->mutex);
1484 /* FIXME: how about fh->pix when there are more users? */
1485 fh->pix = format.fmt.pix;
1486
1487 file->private_data = fh;
1488
1489 spin_lock_init(&fh->vbq_lock);
1490
1491 videobuf_queue_sg_init(&fh->vbq, &omap24xxcam_vbq_ops, NULL,
1492 &fh->vbq_lock, V4L2_BUF_TYPE_VIDEO_CAPTURE,
1493 V4L2_FIELD_NONE,
1494 sizeof(struct videobuf_buffer), fh);
1495
1496 return 0;
1497
1498out_omap24xxcam_sensor_enable:
1499 omap24xxcam_poweron_reset(cam);
1500 module_put(cam->sdev->module);
1501
1502out_try_module_get:
1503 kfree(fh);
1504
1505 return -ENODEV;
1506}
1507
bec43661 1508static int omap24xxcam_release(struct file *file)
39aee69a
SA		 1509{
1510 struct omap24xxcam_fh *fh = file->private_data;
1511 struct omap24xxcam_device *cam = fh->cam;
1512
1513 atomic_inc(&cam->reset_disable);
1514
1515 flush_scheduled_work();
1516
1517 /* stop streaming capture */
1518 videobuf_streamoff(&fh->vbq);
1519
1520 mutex_lock(&cam->mutex);
1521 if (cam->streaming == file) {
1522 cam->streaming = NULL;
1523 mutex_unlock(&cam->mutex);
1524 sysfs_notify(&cam->dev->kobj, NULL, "streaming");
1525 } else {
1526 mutex_unlock(&cam->mutex);
1527 }
1528
1529 atomic_dec(&cam->reset_disable);
1530
1531 omap24xxcam_vbq_free_mmap_buffers(&fh->vbq);
1532
1533 /*
1534 * Make sure the reset work we might have scheduled is not
1535 * pending! It may be run *only* if we have users. (And it may
1536 * not be scheduled anymore since streaming is already
1537 * disabled.)
1538 */
1539 flush_scheduled_work();
1540
1541 mutex_lock(&cam->mutex);
1542 if (atomic_dec_return(&cam->users) == 0) {
1543 omap24xxcam_sensor_disable(cam);
1544 omap24xxcam_poweron_reset(cam);
1545 }
1546 mutex_unlock(&cam->mutex);
1547
1548 file->private_data = NULL;
1549
1550 module_put(cam->sdev->module);
1551 kfree(fh);
1552
1553 return 0;
1554}
1555
bec43661 1556static struct v4l2_file_operations omap24xxcam_fops = {
39aee69a
SA		 1557 .ioctl = video_ioctl2,
1558 .poll = omap24xxcam_poll,
1559 .mmap = omap24xxcam_mmap,
1560 .open = omap24xxcam_open,
1561 .release = omap24xxcam_release,
1562};
1563
1564/*
1565 *
1566 * Power management.
1567 *
1568 */
1569
1570#ifdef CONFIG_PM
1571static int omap24xxcam_suspend(struct platform_device *pdev, pm_message_t state)
1572{
1573 struct omap24xxcam_device *cam = platform_get_drvdata(pdev);
1574
1575 if (atomic_read(&cam->users) == 0)
1576 return 0;
1577
1578 if (!atomic_read(&cam->reset_disable))
1579 omap24xxcam_capture_stop(cam);
1580
1581 omap24xxcam_sensor_disable(cam);
1582 omap24xxcam_poweron_reset(cam);
1583
1584 return 0;
1585}
1586
1587static int omap24xxcam_resume(struct platform_device *pdev)
1588{
1589 struct omap24xxcam_device *cam = platform_get_drvdata(pdev);
1590
1591 if (atomic_read(&cam->users) == 0)
1592 return 0;
1593
1594 omap24xxcam_hwinit(cam);
1595 omap24xxcam_sensor_enable(cam);
1596
1597 if (!atomic_read(&cam->reset_disable))
1598 omap24xxcam_capture_cont(cam);
1599
1600 return 0;
1601}
1602#endif /* CONFIG_PM */
1603
1604static const struct v4l2_ioctl_ops omap24xxcam_ioctl_fops = {
1605 .vidioc_querycap = vidioc_querycap,
1606 .vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
1607 .vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
1608 .vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
1609 .vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
1610 .vidioc_reqbufs = vidioc_reqbufs,
1611 .vidioc_querybuf = vidioc_querybuf,
1612 .vidioc_qbuf = vidioc_qbuf,
1613 .vidioc_dqbuf = vidioc_dqbuf,
1614 .vidioc_streamon = vidioc_streamon,
1615 .vidioc_streamoff = vidioc_streamoff,
1616 .vidioc_enum_input = vidioc_enum_input,
1617 .vidioc_g_input = vidioc_g_input,
1618 .vidioc_s_input = vidioc_s_input,
1619 .vidioc_queryctrl = vidioc_queryctrl,
1620 .vidioc_g_ctrl = vidioc_g_ctrl,
1621 .vidioc_s_ctrl = vidioc_s_ctrl,
1622 .vidioc_g_parm = vidioc_g_parm,
1623 .vidioc_s_parm = vidioc_s_parm,
1624};
1625
1626/*
1627 *
1628 * Camera device (i.e. /dev/video).
1629 *
1630 */
1631
1632static int omap24xxcam_device_register(struct v4l2_int_device *s)
1633{
1634 struct omap24xxcam_device *cam = s->u.slave->master->priv;
1635 struct video_device *vfd;
1636 int rval;
1637
1638 /* We already have a slave. */
1639 if (cam->sdev)
1640 return -EBUSY;
1641
1642 cam->sdev = s;
1643
1644 if (device_create_file(cam->dev, &dev_attr_streaming) != 0) {
1645 dev_err(cam->dev, "could not register sysfs entry\n");
1646 rval = -EBUSY;
1647 goto err;
1648 }
1649
1650 /* initialize the video_device struct */
1651 vfd = cam->vfd = video_device_alloc();
1652 if (!vfd) {
1653 dev_err(cam->dev, "could not allocate video device struct\n");
1654 rval = -ENOMEM;
1655 goto err;
1656 }
1657 vfd->release = video_device_release;
1658
1659 vfd->parent = cam->dev;
1660
1661 strlcpy(vfd->name, CAM_NAME, sizeof(vfd->name));
39aee69a 1662 vfd->fops = &omap24xxcam_fops;
39aee69a
SA		 1663 vfd->ioctl_ops = &omap24xxcam_ioctl_fops;
1664
1665 omap24xxcam_hwinit(cam);
1666
1667 rval = omap24xxcam_sensor_init(cam);
1668 if (rval)
1669 goto err;
1670
1671 if (video_register_device(vfd, VFL_TYPE_GRABBER, video_nr) < 0) {
1672 dev_err(cam->dev, "could not register V4L device\n");
39aee69a
SA		 1673 rval = -EBUSY;
1674 goto err;
1675 }
1676
1677 omap24xxcam_poweron_reset(cam);
1678
38c7c036
LP		 1679 dev_info(cam->dev, "registered device %s\n",
1680 video_device_node_name(vfd));
39aee69a
SA		 1681
1682 return 0;
1683
1684err:
1685 omap24xxcam_device_unregister(s);
1686
1687 return rval;
1688}
1689
1690static void omap24xxcam_device_unregister(struct v4l2_int_device *s)
1691{
1692 struct omap24xxcam_device *cam = s->u.slave->master->priv;
1693
1694 omap24xxcam_sensor_exit(cam);
1695
1696 if (cam->vfd) {
f0813b4c 1697 if (!video_is_registered(cam->vfd)) {
39aee69a
SA		 1698 /*
1699 * The device was never registered, so release the
1700 * video_device struct directly.
1701 */
1702 video_device_release(cam->vfd);
1703 } else {
1704 /*
1705 * The unregister function will release the
1706 * video_device struct as well as
1707 * unregistering it.
1708 */
1709 video_unregister_device(cam->vfd);
1710 }
1711 cam->vfd = NULL;
1712 }
1713
1714 device_remove_file(cam->dev, &dev_attr_streaming);
1715
1716 cam->sdev = NULL;
1717}
1718
1719static struct v4l2_int_master omap24xxcam_master = {
1720 .attach = omap24xxcam_device_register,
1721 .detach = omap24xxcam_device_unregister,
1722};
1723
1724static struct v4l2_int_device omap24xxcam = {
1725 .module = THIS_MODULE,
1726 .name = CAM_NAME,
1727 .type = v4l2_int_type_master,
1728 .u = {
1729 .master = &omap24xxcam_master
1730 },
1731};
1732
1733/*
1734 *
1735 * Driver initialisation and deinitialisation.
1736 *
1737 */
1738
1739static int __init omap24xxcam_probe(struct platform_device *pdev)
1740{
1741 struct omap24xxcam_device *cam;
1742 struct resource *mem;
1743 int irq;
1744
1745 cam = kzalloc(sizeof(*cam), GFP_KERNEL);
1746 if (!cam) {
1747 dev_err(&pdev->dev, "could not allocate memory\n");
1748 goto err;
1749 }
1750
1751 platform_set_drvdata(pdev, cam);
1752
1753 cam->dev = &pdev->dev;
1754
1755 /*
1756 * Impose a lower limit on the amount of memory allocated for
1757 * capture. We require at least enough memory to double-buffer
1758 * QVGA (300KB).
1759 */
1760 if (capture_mem < 320 * 240 * 2 * 2)
1761 capture_mem = 320 * 240 * 2 * 2;
1762 cam->capture_mem = capture_mem;
1763
1764 /* request the mem region for the camera registers */
1765 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1766 if (!mem) {
1767 dev_err(cam->dev, "no mem resource?\n");
1768 goto err;
1769 }
1770 if (!request_mem_region(mem->start, (mem->end - mem->start) + 1,
1771 pdev->name)) {
1772 dev_err(cam->dev,
1773 "cannot reserve camera register I/O region\n");
1774 goto err;
1775 }
1776 cam->mmio_base_phys = mem->start;
1777 cam->mmio_size = (mem->end - mem->start) + 1;
1778
1779 /* map the region */
1780 cam->mmio_base = (unsigned long)
1781 ioremap_nocache(cam->mmio_base_phys, cam->mmio_size);
1782 if (!cam->mmio_base) {
1783 dev_err(cam->dev, "cannot map camera register I/O region\n");
1784 goto err;
1785 }
1786
1787 irq = platform_get_irq(pdev, 0);
1788 if (irq <= 0) {
1789 dev_err(cam->dev, "no irq for camera?\n");
1790 goto err;
1791 }
1792
1793 /* install the interrupt service routine */
1794 if (request_irq(irq, omap24xxcam_isr, 0, CAM_NAME, cam)) {
1795 dev_err(cam->dev,
1796 "could not install interrupt service routine\n");
1797 goto err;
1798 }
1799 cam->irq = irq;
1800
1801 if (omap24xxcam_clock_get(cam))
1802 goto err;
1803
1804 INIT_WORK(&cam->sensor_reset_work, omap24xxcam_sensor_reset_work);
1805
1806 mutex_init(&cam->mutex);
1807 spin_lock_init(&cam->core_enable_disable_lock);
1808
1809 omap24xxcam_sgdma_init(&cam->sgdma,
1810 cam->mmio_base + CAMDMA_REG_OFFSET,
1811 omap24xxcam_stalled_dma_reset,
1812 (unsigned long)cam);
1813
1814 omap24xxcam.priv = cam;
1815
1816 if (v4l2_int_device_register(&omap24xxcam))
1817 goto err;
1818
1819 return 0;
1820
1821err:
1822 omap24xxcam_remove(pdev);
1823 return -ENODEV;
1824}
1825
1826static int omap24xxcam_remove(struct platform_device *pdev)
1827{
1828 struct omap24xxcam_device *cam = platform_get_drvdata(pdev);
1829
1830 if (!cam)
1831 return 0;
1832
1833 if (omap24xxcam.priv != NULL)
1834 v4l2_int_device_unregister(&omap24xxcam);
1835 omap24xxcam.priv = NULL;
1836
1837 omap24xxcam_clock_put(cam);
1838
1839 if (cam->irq) {
1840 free_irq(cam->irq, cam);
1841 cam->irq = 0;
1842 }
1843
1844 if (cam->mmio_base) {
1845 iounmap((void *)cam->mmio_base);
1846 cam->mmio_base = 0;
1847 }
1848
1849 if (cam->mmio_base_phys) {
1850 release_mem_region(cam->mmio_base_phys, cam->mmio_size);
1851 cam->mmio_base_phys = 0;
1852 }
1853
1854 kfree(cam);
1855
1856 return 0;
1857}
1858
1859static struct platform_driver omap24xxcam_driver = {
1860 .probe = omap24xxcam_probe,
1861 .remove = omap24xxcam_remove,
1862#ifdef CONFIG_PM
1863 .suspend = omap24xxcam_suspend,
1864 .resume = omap24xxcam_resume,
1865#endif
1866 .driver = {
1867 .name = CAM_NAME,
1868 .owner = THIS_MODULE,
1869 },
1870};
1871
1872/*
1873 *
1874 * Module initialisation and deinitialisation
1875 *
1876 */
1877
1878static int __init omap24xxcam_init(void)
1879{
1880 return platform_driver_register(&omap24xxcam_driver);
1881}
1882
1883static void __exit omap24xxcam_cleanup(void)
1884{
1885 platform_driver_unregister(&omap24xxcam_driver);
1886}
1887
1888MODULE_AUTHOR("Sakari Ailus <sakari.ailus@nokia.com>");
1889MODULE_DESCRIPTION("OMAP24xx Video for Linux camera driver");
1890MODULE_LICENSE("GPL");
1891module_param(video_nr, int, 0);
1892MODULE_PARM_DESC(video_nr,
1893 "Minor number for video device (-1 ==> auto assign)");
1894module_param(capture_mem, int, 0);
1895MODULE_PARM_DESC(capture_mem, "Maximum amount of memory for capture "
1896 "buffers (default 4800kiB)");
1897
1898module_init(omap24xxcam_init);
1899module_exit(omap24xxcam_cleanup);
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