/*
 *
 * 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/kernel.h>
#include <linux/delay.h>

#include "saa7134-reg.h"
#include "saa7134.h"

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

static unsigned int ts_debug;
module_param(ts_debug, int, 0644);
MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");

#define dprintk(fmt, arg...)    if (ts_debug) \
        printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)

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

static int buffer_activate(struct saa7134_dev *dev,
                           struct saa7134_buf *buf,
                           struct saa7134_buf *next)
{

        dprintk("buffer_activate [%p]",buf);
        buf->vb.state = VIDEOBUF_ACTIVE;
        buf->top_seen = 0;

        if (NULL == next)
                next = buf;
        if (V4L2_FIELD_TOP == buf->vb.field) {
                dprintk("- [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));
        } else {
                dprintk("- [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));
        }

        /* 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;
}

static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
                enum v4l2_field field)
{
        struct saa7134_dev *dev = q->priv_data;
        struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
        unsigned int lines, llength, size;
        int err;

        dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);

        llength = TS_PACKET_SIZE;
        lines = dev->ts.nr_packets;

        size = lines * llength;
        if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
                return -EINVAL;

        if (buf->vb.size != size) {
                saa7134_dma_free(q,buf);
        }

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

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

                dprintk("buffer_prepare: needs_init\n");

                buf->vb.width  = llength;
                buf->vb.height = lines;
                buf->vb.size   = size;
                buf->pt        = &dev->ts.pt_ts;

                err = videobuf_iolock(q,&buf->vb,NULL);
                if (err)
                        goto oops;
                err = saa7134_pgtable_build(dev->pci,buf->pt,
                                            dma->sglist,
                                            dma->sglen,
                                            saa7134_buffer_startpage(buf));
                if (err)
                        goto oops;
        }

        buf->vb.state = VIDEOBUF_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_dev *dev = q->priv_data;

        *size = TS_PACKET_SIZE * dev->ts.nr_packets;
        if (0 == *count)
                *count = dev->ts.nr_bufs;
        *count = saa7134_buffer_count(*size,*count);

        return 0;
}

static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
{
        struct saa7134_dev *dev = q->priv_data;
        struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);

        saa7134_buffer_queue(dev,&dev->ts_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);
        struct saa7134_dev *dev = q->priv_data;

        if (dev->ts_started)
                saa7134_ts_stop(dev);

        saa7134_dma_free(q,buf);
}

struct videobuf_queue_ops saa7134_ts_qops = {
        .buf_setup    = buffer_setup,
        .buf_prepare  = buffer_prepare,
        .buf_queue    = buffer_queue,
        .buf_release  = buffer_release,
};
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);
        init_timer(&dev->ts_q.timeout);
        dev->ts_q.timeout.function = saa7134_buffer_timeout;
        dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
        dev->ts_q.dev              = dev;
        dev->ts_q.need_two         = 1;
        dev->ts_started            = 0;
        saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);

        /* init TS hw */
        saa7134_ts_init_hw(dev);

        return 0;
}

/* Function for stop TS */
int saa7134_ts_stop(struct saa7134_dev *dev)
{
        dprintk("TS stop\n");

        BUG_ON(!dev->ts_started);

        /* 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)
{
        dprintk("TS start\n");

        BUG_ON(dev->ts_started);

        /* 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.pt_ts.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.pt_ts);
        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_q.curr->vb.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,VIDEOBUF_DONE);
        }
        saa7134_buffer_next(dev,&dev->ts_q);

 done:
        spin_unlock(&dev->slock);
}

/* ----------------------------------------------------------- */
/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */