cx88-vbi.c

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/*
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>

#include "cx88.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;
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->core->name , ## arg)

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

int cx8800_vbi_fmt (struct file *file, void *priv,
                    struct v4l2_format *f)
{
    struct cx8800_fh  *fh   = priv;
    struct cx8800_dev *dev  = fh->dev;

    f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
    f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
    f->fmt.vbi.offset = 244;
    f->fmt.vbi.count[0] = VBI_LINE_COUNT;
    f->fmt.vbi.count[1] = VBI_LINE_COUNT;

    if (dev->core->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->core->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 cx8800_start_vbi_dma(struct cx8800_dev    *dev,
             struct cx88_dmaqueue *q,
             struct cx88_buffer   *buf)
{
    struct cx88_core *core = dev->core;

    /* setup fifo + format */
    cx88_sram_channel_setup(dev->core, &cx88_sram_channels[SRAM_CH24],
                buf->vb.width, buf->risc.dma);

    cx_write(MO_VBOS_CONTROL, ( (1 << 18) |  // comb filter delay fixup
                    (1 << 15) |  // enable vbi capture
                    (1 << 11) ));

    /* reset counter */
    cx_write(MO_VBI_GPCNTRL, GP_COUNT_CONTROL_RESET);
    q->count = 1;

    /* enable irqs */
    cx_set(MO_PCI_INTMSK, core->pci_irqmask | PCI_INT_VIDINT);
    cx_set(MO_VID_INTMSK, 0x0f0088);

    /* enable capture */
    cx_set(VID_CAPTURE_CONTROL,0x18);

    /* start dma */
    cx_set(MO_DEV_CNTRL2, (1<<5));
    cx_set(MO_VID_DMACNTRL, 0x88);

    return 0;
}

int cx8800_stop_vbi_dma(struct cx8800_dev *dev)
{
    struct cx88_core *core = dev->core;

    /* stop dma */
    cx_clear(MO_VID_DMACNTRL, 0x88);

    /* disable capture */
    cx_clear(VID_CAPTURE_CONTROL,0x18);

    /* disable irqs */
    cx_clear(MO_PCI_INTMSK, PCI_INT_VIDINT);
    cx_clear(MO_VID_INTMSK, 0x0f0088);
    return 0;
}

int cx8800_restart_vbi_queue(struct cx8800_dev    *dev,
                 struct cx88_dmaqueue *q)
{
    struct cx88_buffer *buf;

    if (list_empty(&q->active))
        return 0;

    buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
    dprintk(2,"restart_queue [%p/%d]: restart dma\n",
        buf, buf->vb.i);
    cx8800_start_vbi_dma(dev, q, buf);
    list_for_each_entry(buf, &q->active, vb.queue)
        buf->count = q->count++;
    mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
    return 0;
}

void cx8800_vbi_timeout(unsigned long data)
{
    struct cx8800_dev *dev = (struct cx8800_dev*)data;
    struct cx88_core *core = dev->core;
    struct cx88_dmaqueue *q = &dev->vbiq;
    struct cx88_buffer *buf;
    unsigned long flags;

    cx88_sram_channel_dump(dev->core, &cx88_sram_channels[SRAM_CH24]);

    cx_clear(MO_VID_DMACNTRL, 0x88);
    cx_clear(VID_CAPTURE_CONTROL, 0x18);

    spin_lock_irqsave(&dev->slock,flags);
    while (!list_empty(&q->active)) {
        buf = list_entry(q->active.next, struct cx88_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->core->name,
               buf, buf->vb.i, (unsigned long)buf->risc.dma);
    }
    cx8800_restart_vbi_queue(dev,q);
    spin_unlock_irqrestore(&dev->slock,flags);
}

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

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 cx8800_fh   *fh  = q->priv_data;
    struct cx8800_dev  *dev = fh->dev;
    struct cx88_buffer *buf = container_of(vb,struct cx88_buffer,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) {
        struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
        buf->vb.width  = VBI_LINE_LENGTH;
        buf->vb.height = VBI_LINE_COUNT;
        buf->vb.size   = size;
        buf->vb.field  = V4L2_FIELD_SEQ_TB;

        if (0 != (rc = videobuf_iolock(q,&buf->vb,NULL)))
            goto fail;
        cx88_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:
    cx88_free_buffer(q,buf);
    return rc;
}

static void
vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
{
    struct cx88_buffer    *buf = container_of(vb,struct cx88_buffer,vb);
    struct cx88_buffer    *prev;
    struct cx8800_fh      *fh   = vq->priv_data;
    struct cx8800_dev     *dev  = fh->dev;
    struct cx88_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);

    if (list_empty(&q->active)) {
        list_add_tail(&buf->vb.queue,&q->active);
        cx8800_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 cx88_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);
        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 cx88_buffer *buf = container_of(vb,struct cx88_buffer,vb);

    cx88_free_buffer(q,buf);
}

const struct videobuf_queue_ops cx8800_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:
 */