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

Signed-off-by: Steven Toth <stoth@hauppauge.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
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Steven Toth authored and Mauro Carvalho Chehab committed Jan 25, 2008
1 parent a57ed8a commit e47f30b
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256 changes: 256 additions & 0 deletions drivers/media/video/cx23885/cx23885-vbi.c
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/*
* 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:
*/
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