2 * V4L2 Driver for SuperH Mobile CEU interface
4 * Copyright (C) 2008 Magnus Damm
6 * Based on V4L2 Driver for PXA camera host - "pxa_camera.c",
8 * Copyright (C) 2006, Sascha Hauer, Pengutronix
9 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
17 #include <linux/init.h>
18 #include <linux/module.h>
20 #include <linux/delay.h>
21 #include <linux/dma-mapping.h>
22 #include <linux/errno.h>
24 #include <linux/interrupt.h>
25 #include <linux/kernel.h>
27 #include <linux/moduleparam.h>
28 #include <linux/time.h>
29 #include <linux/version.h>
30 #include <linux/device.h>
31 #include <linux/platform_device.h>
32 #include <linux/mutex.h>
33 #include <linux/videodev2.h>
35 #include <media/v4l2-common.h>
36 #include <media/v4l2-dev.h>
37 #include <media/soc_camera.h>
38 #include <media/sh_mobile_ceu.h>
39 #include <media/videobuf-dma-contig.h>
41 /* register offsets for sh7722 / sh7723 */
50 #define CSTCR 0x20 /* not on sh7723 */
51 #define CSECR 0x24 /* not on sh7723 */
77 static DEFINE_MUTEX(camera_lock);
79 /* per video frame buffer */
80 struct sh_mobile_ceu_buffer {
81 struct videobuf_buffer vb; /* v4l buffer must be first */
82 const struct soc_camera_data_format *fmt;
85 struct sh_mobile_ceu_dev {
87 struct soc_camera_host ici;
88 struct soc_camera_device *icd;
92 unsigned long video_limit;
94 /* lock used to protect videobuf */
96 struct list_head capture;
97 struct videobuf_buffer *active;
99 struct sh_mobile_ceu_info *pdata;
102 static void ceu_write(struct sh_mobile_ceu_dev *priv,
103 unsigned long reg_offs, unsigned long data)
105 iowrite32(data, priv->base + reg_offs);
108 static unsigned long ceu_read(struct sh_mobile_ceu_dev *priv,
109 unsigned long reg_offs)
111 return ioread32(priv->base + reg_offs);
115 * Videobuf operations
117 static int sh_mobile_ceu_videobuf_setup(struct videobuf_queue *vq,
121 struct soc_camera_device *icd = vq->priv_data;
122 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
123 struct sh_mobile_ceu_dev *pcdev = ici->priv;
124 int bytes_per_pixel = (icd->current_fmt->depth + 7) >> 3;
126 *size = PAGE_ALIGN(icd->width * icd->height * bytes_per_pixel);
131 if (pcdev->video_limit) {
132 while (*size * *count > pcdev->video_limit)
136 dev_dbg(&icd->dev, "count=%d, size=%d\n", *count, *size);
141 static void free_buffer(struct videobuf_queue *vq,
142 struct sh_mobile_ceu_buffer *buf)
144 struct soc_camera_device *icd = vq->priv_data;
146 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
147 &buf->vb, buf->vb.baddr, buf->vb.bsize);
152 videobuf_dma_contig_free(vq, &buf->vb);
153 dev_dbg(&icd->dev, "%s freed\n", __func__);
154 buf->vb.state = VIDEOBUF_NEEDS_INIT;
157 static void sh_mobile_ceu_capture(struct sh_mobile_ceu_dev *pcdev)
159 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) & ~1);
160 ceu_write(pcdev, CETCR, ~ceu_read(pcdev, CETCR) & 0x0317f313);
161 ceu_write(pcdev, CEIER, ceu_read(pcdev, CEIER) | 1);
163 ceu_write(pcdev, CAPCR, ceu_read(pcdev, CAPCR) & ~0x10000);
165 ceu_write(pcdev, CETCR, 0x0317f313 ^ 0x10);
168 ceu_write(pcdev, CDAYR, videobuf_to_dma_contig(pcdev->active));
169 ceu_write(pcdev, CAPSR, 0x1); /* start capture */
173 static int sh_mobile_ceu_videobuf_prepare(struct videobuf_queue *vq,
174 struct videobuf_buffer *vb,
175 enum v4l2_field field)
177 struct soc_camera_device *icd = vq->priv_data;
178 struct sh_mobile_ceu_buffer *buf;
181 buf = container_of(vb, struct sh_mobile_ceu_buffer, vb);
183 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
184 vb, vb->baddr, vb->bsize);
186 /* Added list head initialization on alloc */
187 WARN_ON(!list_empty(&vb->queue));
190 /* This can be useful if you want to see if we actually fill
191 * the buffer with something */
192 memset((void *)vb->baddr, 0xaa, vb->bsize);
195 BUG_ON(NULL == icd->current_fmt);
197 if (buf->fmt != icd->current_fmt ||
198 vb->width != icd->width ||
199 vb->height != icd->height ||
200 vb->field != field) {
201 buf->fmt = icd->current_fmt;
202 vb->width = icd->width;
203 vb->height = icd->height;
205 vb->state = VIDEOBUF_NEEDS_INIT;
208 vb->size = vb->width * vb->height * ((buf->fmt->depth + 7) >> 3);
209 if (0 != vb->baddr && vb->bsize < vb->size) {
214 if (vb->state == VIDEOBUF_NEEDS_INIT) {
215 ret = videobuf_iolock(vq, vb, NULL);
218 vb->state = VIDEOBUF_PREPARED;
223 free_buffer(vq, buf);
228 static void sh_mobile_ceu_videobuf_queue(struct videobuf_queue *vq,
229 struct videobuf_buffer *vb)
231 struct soc_camera_device *icd = vq->priv_data;
232 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
233 struct sh_mobile_ceu_dev *pcdev = ici->priv;
236 dev_dbg(&icd->dev, "%s (vb=0x%p) 0x%08lx %zd\n", __func__,
237 vb, vb->baddr, vb->bsize);
239 vb->state = VIDEOBUF_ACTIVE;
240 spin_lock_irqsave(&pcdev->lock, flags);
241 list_add_tail(&vb->queue, &pcdev->capture);
243 if (!pcdev->active) {
245 sh_mobile_ceu_capture(pcdev);
248 spin_unlock_irqrestore(&pcdev->lock, flags);
251 static void sh_mobile_ceu_videobuf_release(struct videobuf_queue *vq,
252 struct videobuf_buffer *vb)
254 free_buffer(vq, container_of(vb, struct sh_mobile_ceu_buffer, vb));
257 static struct videobuf_queue_ops sh_mobile_ceu_videobuf_ops = {
258 .buf_setup = sh_mobile_ceu_videobuf_setup,
259 .buf_prepare = sh_mobile_ceu_videobuf_prepare,
260 .buf_queue = sh_mobile_ceu_videobuf_queue,
261 .buf_release = sh_mobile_ceu_videobuf_release,
264 static irqreturn_t sh_mobile_ceu_irq(int irq, void *data)
266 struct sh_mobile_ceu_dev *pcdev = data;
267 struct videobuf_buffer *vb;
270 spin_lock_irqsave(&pcdev->lock, flags);
273 list_del_init(&vb->queue);
275 if (!list_empty(&pcdev->capture))
276 pcdev->active = list_entry(pcdev->capture.next,
277 struct videobuf_buffer, queue);
279 pcdev->active = NULL;
281 sh_mobile_ceu_capture(pcdev);
283 vb->state = VIDEOBUF_DONE;
284 do_gettimeofday(&vb->ts);
287 spin_unlock_irqrestore(&pcdev->lock, flags);
292 static int sh_mobile_ceu_add_device(struct soc_camera_device *icd)
294 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
295 struct sh_mobile_ceu_dev *pcdev = ici->priv;
298 mutex_lock(&camera_lock);
304 "SuperH Mobile CEU driver attached to camera %d\n",
307 ret = icd->ops->init(icd);
311 ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
312 while (ceu_read(pcdev, CSTSR) & 1)
317 mutex_unlock(&camera_lock);
322 static void sh_mobile_ceu_remove_device(struct soc_camera_device *icd)
324 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
325 struct sh_mobile_ceu_dev *pcdev = ici->priv;
327 BUG_ON(icd != pcdev->icd);
329 /* disable capture, disable interrupts */
330 ceu_write(pcdev, CEIER, 0);
331 ceu_write(pcdev, CAPSR, 1 << 16); /* reset */
332 icd->ops->release(icd);
335 "SuperH Mobile CEU driver detached from camera %d\n",
341 static int sh_mobile_ceu_set_bus_param(struct soc_camera_device *icd,
344 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
345 struct sh_mobile_ceu_dev *pcdev = ici->priv;
346 int ret, buswidth, width, cfszr_width, cdwdr_width;
347 unsigned long camera_flags, common_flags, value;
349 camera_flags = icd->ops->query_bus_param(icd);
350 common_flags = soc_camera_bus_param_compatible(camera_flags,
351 pcdev->pdata->flags);
355 ret = icd->ops->set_bus_param(icd, common_flags);
359 switch (common_flags & SOCAM_DATAWIDTH_MASK) {
360 case SOCAM_DATAWIDTH_8:
363 case SOCAM_DATAWIDTH_16:
370 ceu_write(pcdev, CRCNTR, 0);
371 ceu_write(pcdev, CRCMPR, 0);
374 value |= (common_flags & SOCAM_VSYNC_ACTIVE_LOW) ? (1 << 1) : 0;
375 value |= (common_flags & SOCAM_HSYNC_ACTIVE_LOW) ? (1 << 0) : 0;
376 value |= (buswidth == 16) ? (1 << 12) : 0;
377 ceu_write(pcdev, CAMCR, value);
379 ceu_write(pcdev, CAPCR, 0x00300000);
380 ceu_write(pcdev, CAIFR, 0);
384 width = icd->width * (icd->current_fmt->depth / 8);
385 width = (buswidth == 16) ? width / 2 : width;
386 cfszr_width = (buswidth == 8) ? width / 2 : width;
387 cdwdr_width = (buswidth == 16) ? width * 2 : width;
389 ceu_write(pcdev, CAMOR, 0);
390 ceu_write(pcdev, CAPWR, (icd->height << 16) | width);
391 ceu_write(pcdev, CFLCR, 0); /* data fetch mode - no scaling */
392 ceu_write(pcdev, CFSZR, (icd->height << 16) | cfszr_width);
393 ceu_write(pcdev, CLFCR, 0); /* data fetch mode - no lowpass filter */
394 ceu_write(pcdev, CDOCR, 0x00000016);
396 ceu_write(pcdev, CDWDR, cdwdr_width);
397 ceu_write(pcdev, CFWCR, 0); /* keep "datafetch firewall" disabled */
399 /* not in bundle mode: skip CBDSR, CDAYR2, CDACR2, CDBYR2, CDBCR2 */
400 /* in data fetch mode: no need for CDACR, CDBYR, CDBCR */
405 static int sh_mobile_ceu_try_bus_param(struct soc_camera_device *icd,
408 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
409 struct sh_mobile_ceu_dev *pcdev = ici->priv;
410 unsigned long camera_flags, common_flags;
412 camera_flags = icd->ops->query_bus_param(icd);
413 common_flags = soc_camera_bus_param_compatible(camera_flags,
414 pcdev->pdata->flags);
421 static int sh_mobile_ceu_set_fmt_cap(struct soc_camera_device *icd,
422 __u32 pixfmt, struct v4l2_rect *rect)
424 return icd->ops->set_fmt_cap(icd, pixfmt, rect);
427 static int sh_mobile_ceu_try_fmt_cap(struct soc_camera_device *icd,
428 struct v4l2_format *f)
430 /* FIXME: calculate using depth and bus width */
432 if (f->fmt.pix.height < 4)
433 f->fmt.pix.height = 4;
434 if (f->fmt.pix.height > 1920)
435 f->fmt.pix.height = 1920;
436 if (f->fmt.pix.width < 2)
437 f->fmt.pix.width = 2;
438 if (f->fmt.pix.width > 2560)
439 f->fmt.pix.width = 2560;
440 f->fmt.pix.width &= ~0x01;
441 f->fmt.pix.height &= ~0x03;
443 /* limit to sensor capabilities */
444 return icd->ops->try_fmt_cap(icd, f);
447 static int sh_mobile_ceu_reqbufs(struct soc_camera_file *icf,
448 struct v4l2_requestbuffers *p)
452 /* This is for locking debugging only. I removed spinlocks and now I
453 * check whether .prepare is ever called on a linked buffer, or whether
454 * a dma IRQ can occur for an in-work or unlinked buffer. Until now
455 * it hadn't triggered */
456 for (i = 0; i < p->count; i++) {
457 struct sh_mobile_ceu_buffer *buf;
459 buf = container_of(icf->vb_vidq.bufs[i],
460 struct sh_mobile_ceu_buffer, vb);
461 INIT_LIST_HEAD(&buf->vb.queue);
467 static unsigned int sh_mobile_ceu_poll(struct file *file, poll_table *pt)
469 struct soc_camera_file *icf = file->private_data;
470 struct sh_mobile_ceu_buffer *buf;
472 buf = list_entry(icf->vb_vidq.stream.next,
473 struct sh_mobile_ceu_buffer, vb.stream);
475 poll_wait(file, &buf->vb.done, pt);
477 if (buf->vb.state == VIDEOBUF_DONE ||
478 buf->vb.state == VIDEOBUF_ERROR)
479 return POLLIN|POLLRDNORM;
484 static int sh_mobile_ceu_querycap(struct soc_camera_host *ici,
485 struct v4l2_capability *cap)
487 strlcpy(cap->card, "SuperH_Mobile_CEU", sizeof(cap->card));
488 cap->version = KERNEL_VERSION(0, 0, 5);
489 cap->capabilities = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
493 static void sh_mobile_ceu_init_videobuf(struct videobuf_queue *q,
494 struct soc_camera_device *icd)
496 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
497 struct sh_mobile_ceu_dev *pcdev = ici->priv;
499 videobuf_queue_dma_contig_init(q,
500 &sh_mobile_ceu_videobuf_ops,
501 &ici->dev, &pcdev->lock,
502 V4L2_BUF_TYPE_VIDEO_CAPTURE,
504 sizeof(struct sh_mobile_ceu_buffer),
508 static struct soc_camera_host_ops sh_mobile_ceu_host_ops = {
509 .owner = THIS_MODULE,
510 .add = sh_mobile_ceu_add_device,
511 .remove = sh_mobile_ceu_remove_device,
512 .set_fmt_cap = sh_mobile_ceu_set_fmt_cap,
513 .try_fmt_cap = sh_mobile_ceu_try_fmt_cap,
514 .reqbufs = sh_mobile_ceu_reqbufs,
515 .poll = sh_mobile_ceu_poll,
516 .querycap = sh_mobile_ceu_querycap,
517 .try_bus_param = sh_mobile_ceu_try_bus_param,
518 .set_bus_param = sh_mobile_ceu_set_bus_param,
519 .init_videobuf = sh_mobile_ceu_init_videobuf,
522 static int sh_mobile_ceu_probe(struct platform_device *pdev)
524 struct sh_mobile_ceu_dev *pcdev;
525 struct resource *res;
530 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
531 irq = platform_get_irq(pdev, 0);
533 dev_err(&pdev->dev, "Not enough CEU platform resources.\n");
538 pcdev = kzalloc(sizeof(*pcdev), GFP_KERNEL);
540 dev_err(&pdev->dev, "Could not allocate pcdev\n");
545 platform_set_drvdata(pdev, pcdev);
546 INIT_LIST_HEAD(&pcdev->capture);
547 spin_lock_init(&pcdev->lock);
549 pcdev->pdata = pdev->dev.platform_data;
552 dev_err(&pdev->dev, "CEU platform data not set.\n");
556 base = ioremap_nocache(res->start, res->end - res->start + 1);
559 dev_err(&pdev->dev, "Unable to ioremap CEU registers.\n");
565 pcdev->video_limit = 0; /* only enabled if second resource exists */
566 pcdev->dev = &pdev->dev;
568 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
570 err = dma_declare_coherent_memory(&pdev->dev, res->start,
572 (res->end - res->start) + 1,
574 DMA_MEMORY_EXCLUSIVE);
576 dev_err(&pdev->dev, "Unable to declare CEU memory.\n");
581 pcdev->video_limit = (res->end - res->start) + 1;
585 err = request_irq(pcdev->irq, sh_mobile_ceu_irq, IRQF_DISABLED,
586 pdev->dev.bus_id, pcdev);
588 dev_err(&pdev->dev, "Unable to register CEU interrupt.\n");
589 goto exit_release_mem;
592 pcdev->ici.priv = pcdev;
593 pcdev->ici.dev.parent = &pdev->dev;
594 pcdev->ici.nr = pdev->id;
595 pcdev->ici.drv_name = pdev->dev.bus_id,
596 pcdev->ici.ops = &sh_mobile_ceu_host_ops,
598 err = soc_camera_host_register(&pcdev->ici);
605 free_irq(pcdev->irq, pcdev);
607 if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
608 dma_release_declared_memory(&pdev->dev);
617 static int sh_mobile_ceu_remove(struct platform_device *pdev)
619 struct sh_mobile_ceu_dev *pcdev = platform_get_drvdata(pdev);
621 soc_camera_host_unregister(&pcdev->ici);
622 free_irq(pcdev->irq, pcdev);
623 if (platform_get_resource(pdev, IORESOURCE_MEM, 1))
624 dma_release_declared_memory(&pdev->dev);
625 iounmap(pcdev->base);
630 static struct platform_driver sh_mobile_ceu_driver = {
632 .name = "sh_mobile_ceu",
634 .probe = sh_mobile_ceu_probe,
635 .remove = sh_mobile_ceu_remove,
638 static int __init sh_mobile_ceu_init(void)
640 return platform_driver_register(&sh_mobile_ceu_driver);
643 static void __exit sh_mobile_ceu_exit(void)
645 platform_driver_unregister(&sh_mobile_ceu_driver);
648 module_init(sh_mobile_ceu_init);
649 module_exit(sh_mobile_ceu_exit);
651 MODULE_DESCRIPTION("SuperH Mobile CEU driver");
652 MODULE_AUTHOR("Magnus Damm");
653 MODULE_LICENSE("GPL");