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linux-sg2042/drivers/media/pci/saa7134/saa7134-ts.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* device driver for philips saa7134 based TV cards
* video4linux video interface
*
* (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
*/
#include "saa7134.h"
#include "saa7134-reg.h"
#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
/* ------------------------------------------------------------------ */
static unsigned int ts_debug;
module_param(ts_debug, int, 0644);
MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
#define ts_dbg(fmt, arg...) do { \
if (ts_debug) \
printk(KERN_DEBUG pr_fmt("ts: " fmt), ## arg); \
} while (0)
/* ------------------------------------------------------------------ */
static int buffer_activate(struct saa7134_dev *dev,
struct saa7134_buf *buf,
struct saa7134_buf *next)
{
ts_dbg("buffer_activate [%p]", buf);
buf->top_seen = 0;
if (!dev->ts_started)
dev->ts_field = V4L2_FIELD_TOP;
if (NULL == next)
next = buf;
if (V4L2_FIELD_TOP == dev->ts_field) {
ts_dbg("- [top] buf=%p next=%p\n", buf, next);
saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
dev->ts_field = V4L2_FIELD_BOTTOM;
} else {
ts_dbg("- [bottom] buf=%p next=%p\n", buf, next);
saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
dev->ts_field = V4L2_FIELD_TOP;
}
/* start DMA */
saa7134_set_dmabits(dev);
mod_timer(&dev->ts_q.timeout, jiffies+TS_BUFFER_TIMEOUT);
if (!dev->ts_started)
saa7134_ts_start(dev);
return 0;
}
int saa7134_ts_buffer_init(struct vb2_buffer *vb2)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
dmaq->curr = NULL;
buf->activate = buffer_activate;
return 0;
}
EXPORT_SYMBOL_GPL(saa7134_ts_buffer_init);
int saa7134_ts_buffer_prepare(struct vb2_buffer *vb2)
{
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
struct saa7134_dev *dev = dmaq->dev;
struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
unsigned int lines, llength, size;
ts_dbg("buffer_prepare [%p]\n", buf);
llength = TS_PACKET_SIZE;
lines = dev->ts.nr_packets;
size = lines * llength;
if (vb2_plane_size(vb2, 0) < size)
return -EINVAL;
vb2_set_plane_payload(vb2, 0, size);
vbuf->field = dev->field;
return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
saa7134_buffer_startpage(buf));
}
EXPORT_SYMBOL_GPL(saa7134_ts_buffer_prepare);
int saa7134_ts_queue_setup(struct vb2_queue *q,
unsigned int *nbuffers, unsigned int *nplanes,
unsigned int sizes[], struct device *alloc_devs[])
{
struct saa7134_dmaqueue *dmaq = q->drv_priv;
struct saa7134_dev *dev = dmaq->dev;
int size = TS_PACKET_SIZE * dev->ts.nr_packets;
if (0 == *nbuffers)
*nbuffers = dev->ts.nr_bufs;
*nbuffers = saa7134_buffer_count(size, *nbuffers);
if (*nbuffers < 3)
*nbuffers = 3;
*nplanes = 1;
sizes[0] = size;
return 0;
}
EXPORT_SYMBOL_GPL(saa7134_ts_queue_setup);
int saa7134_ts_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct saa7134_dmaqueue *dmaq = vq->drv_priv;
struct saa7134_dev *dev = dmaq->dev;
/*
* Planar video capture and TS share the same DMA channel,
* so only one can be active at a time.
*/
if (vb2_is_busy(&dev->video_vbq) && dev->fmt->planar) {
struct saa7134_buf *buf, *tmp;
list_for_each_entry_safe(buf, tmp, &dmaq->queue, entry) {
list_del(&buf->entry);
vb2_buffer_done(&buf->vb2.vb2_buf,
VB2_BUF_STATE_QUEUED);
}
if (dmaq->curr) {
vb2_buffer_done(&dmaq->curr->vb2.vb2_buf,
VB2_BUF_STATE_QUEUED);
dmaq->curr = NULL;
}
return -EBUSY;
}
dmaq->seq_nr = 0;
return 0;
}
EXPORT_SYMBOL_GPL(saa7134_ts_start_streaming);
void saa7134_ts_stop_streaming(struct vb2_queue *vq)
{
struct saa7134_dmaqueue *dmaq = vq->drv_priv;
struct saa7134_dev *dev = dmaq->dev;
saa7134_ts_stop(dev);
saa7134_stop_streaming(dev, dmaq);
}
EXPORT_SYMBOL_GPL(saa7134_ts_stop_streaming);
struct vb2_ops saa7134_ts_qops = {
.queue_setup = saa7134_ts_queue_setup,
.buf_init = saa7134_ts_buffer_init,
.buf_prepare = saa7134_ts_buffer_prepare,
.buf_queue = saa7134_vb2_buffer_queue,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
.stop_streaming = saa7134_ts_stop_streaming,
};
EXPORT_SYMBOL_GPL(saa7134_ts_qops);
/* ----------------------------------------------------------- */
/* exported stuff */
static unsigned int tsbufs = 8;
module_param(tsbufs, int, 0444);
MODULE_PARM_DESC(tsbufs, "number of ts buffers for read/write IO, range 2-32");
static unsigned int ts_nr_packets = 64;
module_param(ts_nr_packets, int, 0444);
MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
int saa7134_ts_init_hw(struct saa7134_dev *dev)
{
/* deactivate TS softreset */
saa_writeb(SAA7134_TS_SERIAL1, 0x00);
/* TSSOP high active, TSVAL high active, TSLOCK ignored */
saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
/* TSNOPIT=0, TSCOLAP=0 */
saa_writeb(SAA7134_TS_DMA2,
((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
return 0;
}
int saa7134_ts_init1(struct saa7134_dev *dev)
{
/* sanitycheck insmod options */
if (tsbufs < 2)
tsbufs = 2;
if (tsbufs > VIDEO_MAX_FRAME)
tsbufs = VIDEO_MAX_FRAME;
if (ts_nr_packets < 4)
ts_nr_packets = 4;
if (ts_nr_packets > 312)
ts_nr_packets = 312;
dev->ts.nr_bufs = tsbufs;
dev->ts.nr_packets = ts_nr_packets;
INIT_LIST_HEAD(&dev->ts_q.queue);
timer_setup(&dev->ts_q.timeout, saa7134_buffer_timeout, 0);
dev->ts_q.dev = dev;
dev->ts_q.need_two = 1;
dev->ts_started = 0;
saa7134_pgtable_alloc(dev->pci, &dev->ts_q.pt);
/* init TS hw */
saa7134_ts_init_hw(dev);
return 0;
}
/* Function for stop TS */
int saa7134_ts_stop(struct saa7134_dev *dev)
{
ts_dbg("TS stop\n");
if (!dev->ts_started)
return 0;
/* Stop TS stream */
switch (saa7134_boards[dev->board].ts_type) {
case SAA7134_MPEG_TS_PARALLEL:
saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
dev->ts_started = 0;
break;
case SAA7134_MPEG_TS_SERIAL:
saa_writeb(SAA7134_TS_SERIAL0, 0x40);
dev->ts_started = 0;
break;
}
return 0;
}
/* Function for start TS */
int saa7134_ts_start(struct saa7134_dev *dev)
{
ts_dbg("TS start\n");
if (WARN_ON(dev->ts_started))
return 0;
/* dma: setup channel 5 (= TS) */
saa_writeb(SAA7134_TS_DMA0, (dev->ts.nr_packets - 1) & 0xff);
saa_writeb(SAA7134_TS_DMA1,
((dev->ts.nr_packets - 1) >> 8) & 0xff);
/* TSNOPIT=0, TSCOLAP=0 */
saa_writeb(SAA7134_TS_DMA2,
(((dev->ts.nr_packets - 1) >> 16) & 0x3f) | 0x00);
saa_writel(SAA7134_RS_PITCH(5), TS_PACKET_SIZE);
saa_writel(SAA7134_RS_CONTROL(5), SAA7134_RS_CONTROL_BURST_16 |
SAA7134_RS_CONTROL_ME |
(dev->ts_q.pt.dma >> 12));
/* reset hardware TS buffers */
saa_writeb(SAA7134_TS_SERIAL1, 0x00);
saa_writeb(SAA7134_TS_SERIAL1, 0x03);
saa_writeb(SAA7134_TS_SERIAL1, 0x00);
saa_writeb(SAA7134_TS_SERIAL1, 0x01);
/* TS clock non-inverted */
saa_writeb(SAA7134_TS_SERIAL1, 0x00);
/* Start TS stream */
switch (saa7134_boards[dev->board].ts_type) {
case SAA7134_MPEG_TS_PARALLEL:
saa_writeb(SAA7134_TS_SERIAL0, 0x40);
saa_writeb(SAA7134_TS_PARALLEL, 0xec |
(saa7134_boards[dev->board].ts_force_val << 4));
break;
case SAA7134_MPEG_TS_SERIAL:
saa_writeb(SAA7134_TS_SERIAL0, 0xd8);
saa_writeb(SAA7134_TS_PARALLEL, 0x6c |
(saa7134_boards[dev->board].ts_force_val << 4));
saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 0xbc);
saa_writeb(SAA7134_TS_SERIAL1, 0x02);
break;
}
dev->ts_started = 1;
return 0;
}
int saa7134_ts_fini(struct saa7134_dev *dev)
{
saa7134_pgtable_free(dev->pci, &dev->ts_q.pt);
return 0;
}
void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
{
enum v4l2_field field;
spin_lock(&dev->slock);
if (dev->ts_q.curr) {
field = dev->ts_field;
if (field != V4L2_FIELD_TOP) {
if ((status & 0x100000) != 0x000000)
goto done;
} else {
if ((status & 0x100000) != 0x100000)
goto done;
}
saa7134_buffer_finish(dev, &dev->ts_q, VB2_BUF_STATE_DONE);
}
saa7134_buffer_next(dev,&dev->ts_q);
done:
spin_unlock(&dev->slock);
}
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