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android_kernel_xiaomi_sm8350/drivers/media/video/saa7134/saa7134-vbi.c
Mauro Carvalho Chehab c7b0ac0546 V4L/DVB (3516): Make video_buf more generic 
Video_buf were concerned to allow PCI devices to be used as
video capture devices. This patch extends video_buf features
by virtualizing pci-dependent functions and allowing other
type of devices to use it.
It is still DMA centric, although it may be used also by
devices that emulates scatter/gather behavior or a DMA device

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2006-03-24 16:26:49 -03:00

256 lines
7.3 KiB
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/*
*
* device driver for philips saa7134 based TV cards
* video4linux video interface
*
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
*
* 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/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include "saa7134-reg.h"
#include "saa7134.h"
/* ------------------------------------------------------------------ */
static unsigned int vbi_debug = 0;
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
static unsigned int vbibufs = 4;
module_param(vbibufs, int, 0444);
MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
#define dprintk(fmt, arg...) if (vbi_debug) \
printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
/* ------------------------------------------------------------------ */
#define VBI_LINE_COUNT 16
#define VBI_LINE_LENGTH 2048
#define VBI_SCALE 0x200
static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
int task)
{
struct saa7134_tvnorm *norm = dev->tvnorm;
/* setup video scaler */
saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff);
saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8);
saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff);
saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8);
saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 & 0xff);
saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop_0 & 0xff);
saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop_0 >> 8);
saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff);
saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8);
saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00);
saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width & 0xff);
saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8);
saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff);
saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 8);
saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
}
/* ------------------------------------------------------------------ */
static int buffer_activate(struct saa7134_dev *dev,
struct saa7134_buf *buf,
struct saa7134_buf *next)
{
unsigned long control,base;
dprintk("buffer_activate [%p]\n",buf);
buf->vb.state = STATE_ACTIVE;
buf->top_seen = 0;
task_init(dev,buf,TASK_A);
task_init(dev,buf,TASK_B);
saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
/* DMA: setup channel 2+3 (= VBI Task A+B) */
base = saa7134_buffer_base(buf);
control = SAA7134_RS_CONTROL_BURST_16 |
SAA7134_RS_CONTROL_ME |
(buf->pt->dma >> 12);
saa_writel(SAA7134_RS_BA1(2),base);
saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
saa_writel(SAA7134_RS_CONTROL(2),control);
saa_writel(SAA7134_RS_BA1(3),base);
saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
saa_writel(SAA7134_RS_CONTROL(3),control);
/* start DMA */
saa7134_set_dmabits(dev);
mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
return 0;
}
static int buffer_prepare(struct videobuf_queue *q,
struct videobuf_buffer *vb,
enum v4l2_field field)
{
struct saa7134_fh *fh = q->priv_data;
struct saa7134_dev *dev = fh->dev;
struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
struct saa7134_tvnorm *norm = dev->tvnorm;
unsigned int lines, llength, size;
int err;
lines = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
if (lines > VBI_LINE_COUNT)
lines = VBI_LINE_COUNT;
llength = VBI_LINE_LENGTH;
size = lines * llength * 2;
if (0 != buf->vb.baddr && buf->vb.bsize < size)
return -EINVAL;
if (buf->vb.size != size)
saa7134_dma_free(q,buf);
if (STATE_NEEDS_INIT == buf->vb.state) {
buf->vb.width = llength;
buf->vb.height = lines;
buf->vb.size = size;
buf->pt = &fh->pt_vbi;
err = videobuf_iolock(q,&buf->vb,NULL);
if (err)
goto oops;
err = saa7134_pgtable_build(dev->pci,buf->pt,
buf->vb.dma.sglist,
buf->vb.dma.sglen,
saa7134_buffer_startpage(buf));
if (err)
goto oops;
}
buf->vb.state = STATE_PREPARED;
buf->activate = buffer_activate;
buf->vb.field = field;
return 0;
oops:
saa7134_dma_free(q,buf);
return err;
}
static int
buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
{
struct saa7134_fh *fh = q->priv_data;
struct saa7134_dev *dev = fh->dev;
int llength,lines;
lines = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
llength = VBI_LINE_LENGTH;
*size = lines * llength * 2;
if (0 == *count)
*count = vbibufs;
*count = saa7134_buffer_count(*size,*count);
return 0;
}
static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
struct saa7134_fh *fh = q->priv_data;
struct saa7134_dev *dev = fh->dev;
struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
saa7134_buffer_queue(dev,&dev->vbi_q,buf);
}
static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
saa7134_dma_free(q,buf);
}
struct videobuf_queue_ops saa7134_vbi_qops = {
.buf_setup = buffer_setup,
.buf_prepare = buffer_prepare,
.buf_queue = buffer_queue,
.buf_release = buffer_release,
};
/* ------------------------------------------------------------------ */
int saa7134_vbi_init1(struct saa7134_dev *dev)
{
INIT_LIST_HEAD(&dev->vbi_q.queue);
init_timer(&dev->vbi_q.timeout);
dev->vbi_q.timeout.function = saa7134_buffer_timeout;
dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q);
dev->vbi_q.dev = dev;
if (vbibufs < 2)
vbibufs = 2;
if (vbibufs > VIDEO_MAX_FRAME)
vbibufs = VIDEO_MAX_FRAME;
return 0;
}
int saa7134_vbi_fini(struct saa7134_dev *dev)
{
/* nothing */
return 0;
}
void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
{
spin_lock(&dev->slock);
if (dev->vbi_q.curr) {
dev->vbi_fieldcount++;
/* make sure we have seen both fields */
if ((status & 0x10) == 0x00) {
dev->vbi_q.curr->top_seen = 1;
goto done;
}
if (!dev->vbi_q.curr->top_seen)
goto done;
dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
}
saa7134_buffer_next(dev,&dev->vbi_q);
done:
spin_unlock(&dev->slock);
}
/* ----------------------------------------------------------- */
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
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