V4L/DVB (7009): cx23885: Video and VBI related files

/*

 *  Driver for the Conexant CX23885 PCIe bridge

 *

 *  Copyright (c) 2007 Steven Toth <stoth@hauppauge.com>

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or

 *  (at your option) any later version.

 *

 *  This program is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *

 *  GNU General Public License for more details.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/init.h>

#include <linux/slab.h>

#include "cx23885.h"

static unsigned int vbibufs = 4;

module_param(vbibufs, int, 0644);

MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");

static unsigned int vbi_debug = 0;

module_param(vbi_debug, int, 0644);

MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");

#define dprintk(level, fmt, arg...)	if (vbi_debug >= level) \

	printk(KERN_DEBUG "%s: " fmt, dev->name , ## arg)

/* ------------------------------------------------------------------ */

int cx23885_vbi_fmt(struct file *file, void *priv,

	struct v4l2_format *f)

{

	struct cx23885_fh *fh = priv;

	struct cx23885_dev *dev = fh->dev;

	if (dev->tvnorm & V4L2_STD_525_60) {

		/* ntsc */

		f->fmt.vbi.sampling_rate = 28636363;

		f->fmt.vbi.start[0] = 10;

		f->fmt.vbi.start[1] = 273;

	} else if (dev->tvnorm & V4L2_STD_625_50) {

		/* pal */

		f->fmt.vbi.sampling_rate = 35468950;

		f->fmt.vbi.start[0] = 7 - 1;

		f->fmt.vbi.start[1] = 319 - 1;

	}

	return 0;

}

static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,

			 struct cx23885_dmaqueue *q,

			 struct cx23885_buffer   *buf)

{

	/* setup fifo + format */

	cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],

				buf->vb.width, buf->risc.dma);

	/* reset counter */

	q->count = 1;

	/* enable irqs */

	cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | 0x01);

	cx_set(VID_A_INT_MSK, 0x000022);

	/* start dma */

	cx_set(DEV_CNTRL2, (1<<5));

	cx_set(VID_A_DMA_CTL, 0x00000022);

	return 0;

}

int cx23885_stop_vbi_dma(struct cx23885_dev *dev)

{

	/* stop dma */

	cx_clear(VID_A_DMA_CTL, 0x00000022);

	/* disable irqs */

	cx_clear(PCI_INT_MSK, 0x000001);

	cx_clear(VID_A_INT_MSK, 0x00000022);

	return 0;

}

int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,

			     struct cx23885_dmaqueue *q)

{

	struct cx23885_buffer *buf;

	struct list_head *item;

	if (list_empty(&q->active))

		return 0;

	buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);

	dprintk(2, "restart_queue [%p/%d]: restart dma\n",

		buf, buf->vb.i);

	cx23885_start_vbi_dma(dev, q, buf);

	list_for_each(item, &q->active) {

		buf = list_entry(item, struct cx23885_buffer, vb.queue);

		buf->count = q->count++;

	}

	mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);

	return 0;

}

void cx23885_vbi_timeout(unsigned long data)

{

	struct cx23885_dev *dev = (struct cx23885_dev *)data;

	struct cx23885_dmaqueue *q = &dev->vbiq;

	struct cx23885_buffer *buf;

	unsigned long flags;

	cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);

	cx_clear(VID_A_DMA_CTL, 0x22);

	spin_lock_irqsave(&dev->slock, flags);

	while (!list_empty(&q->active)) {

		buf = list_entry(q->active.next, struct cx23885_buffer,

			vb.queue);

		list_del(&buf->vb.queue);

		buf->vb.state = VIDEOBUF_ERROR;

		wake_up(&buf->vb.done);

		printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,

		       buf, buf->vb.i, (unsigned long)buf->risc.dma);

	}

	cx23885_restart_vbi_queue(dev, q);

	spin_unlock_irqrestore(&dev->slock, flags);

}

/* ------------------------------------------------------------------ */

#define VBI_LINE_LENGTH 2048

#define VBI_LINE_COUNT 17

static int

vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)

{

	*size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;

	if (0 == *count)

		*count = vbibufs;

	if (*count < 2)

		*count = 2;

	if (*count > 32)

		*count = 32;

	return 0;

}

static int

vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,

	    enum v4l2_field field)

{

	struct cx23885_fh *fh  = q->priv_data;

	struct cx23885_dev *dev = fh->dev;

	struct cx23885_buffer *buf = container_of(vb,

		struct cx23885_buffer, vb);

	struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);

	unsigned int size;

	int rc;

	size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;

	if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)

		return -EINVAL;

	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {

		buf->vb.width  = VBI_LINE_LENGTH;

		buf->vb.height = VBI_LINE_COUNT;

		buf->vb.size   = size;

		buf->vb.field  = V4L2_FIELD_SEQ_TB;

		rc = videobuf_iolock(q, &buf->vb, NULL);

		if (0 != rc)

			goto fail;

		cx23885_risc_buffer(dev->pci, &buf->risc,

				 dma->sglist,

				 0, buf->vb.width * buf->vb.height,

				 buf->vb.width, 0,

				 buf->vb.height);

	}

	buf->vb.state = VIDEOBUF_PREPARED;

	return 0;

 fail:

	cx23885_free_buffer(q, buf);

	return rc;

}

static void

vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)

{

	struct cx23885_buffer   *buf =

		container_of(vb, struct cx23885_buffer, vb);

	struct cx23885_buffer   *prev;

	struct cx23885_fh       *fh   = vq->priv_data;

	struct cx23885_dev      *dev  = fh->dev;

	struct cx23885_dmaqueue *q    = &dev->vbiq;

	/* add jump to stopper */

	buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);

	buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);

	buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */

	if (list_empty(&q->active)) {

		list_add_tail(&buf->vb.queue, &q->active);

		cx23885_start_vbi_dma(dev, q, buf);

		buf->vb.state = VIDEOBUF_ACTIVE;

		buf->count    = q->count++;

		mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);

		dprintk(2, "[%p/%d] vbi_queue - first active\n",

			buf, buf->vb.i);

	} else {

		prev = list_entry(q->active.prev, struct cx23885_buffer,

			vb.queue);

		list_add_tail(&buf->vb.queue, &q->active);

		buf->vb.state = VIDEOBUF_ACTIVE;

		buf->count    = q->count++;

		prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);

		prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */

		dprintk(2, "[%p/%d] buffer_queue - append to active\n",

			buf, buf->vb.i);

	}

}

static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)

{

	struct cx23885_buffer *buf =

		container_of(vb, struct cx23885_buffer, vb);

	cx23885_free_buffer(q, buf);

}

struct videobuf_queue_ops cx23885_vbi_qops = {

	.buf_setup    = vbi_setup,

	.buf_prepare  = vbi_prepare,

	.buf_queue    = vbi_queue,

	.buf_release  = vbi_release,

};

/* ------------------------------------------------------------------ */

/*

 * Local variables:

 * c-basic-offset: 8

 * End:

 */