drivers/media/video/cx88/cx88-vbi.c

   1 #include <linux/kernel.h>
   2 #include <linux/module.h>
   3 #include <linux/init.h>
   4 #include <linux/slab.h>
   5
   6 #include "cx88.h"
   7
   8 static unsigned int vbibufs = 4;
   9 MODULE_PARM(vbibufs,"i");
  10 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  11
  12 static unsigned int vbi_debug = 0;
  13 MODULE_PARM(vbi_debug,"i");
  14 MODULE_PARM_DESC(vbi_debug,"enable debug messages [video]");
  15
  16 #define dprintk(level,fmt, arg...)      if (vbi_debug >= level) \
  17         printk(KERN_DEBUG "%s: " fmt, dev->name , ## arg)
  18
  19 /* ------------------------------------------------------------------ */
  20
  21 void cx8800_vbi_fmt(struct cx8800_dev *dev, struct v4l2_format *f)
  22 {
  23         memset(&f->fmt.vbi,0,sizeof(f->fmt.vbi));
  24
  25         f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
  26         f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
  27         f->fmt.vbi.offset = 244;
  28         f->fmt.vbi.count[0] = VBI_LINE_COUNT;
  29         f->fmt.vbi.count[1] = VBI_LINE_COUNT;
  30
  31         if (dev->tvnorm->id & V4L2_STD_525_60) {
  32                 /* ntsc */
  33                 f->fmt.vbi.sampling_rate = 28636363;
  34                 f->fmt.vbi.start[0] = 10 -1;
  35                 f->fmt.vbi.start[1] = 273 -1;
  36
  37         } else if (V4L2_STD_625_50) {
  38                 /* pal */
  39                 f->fmt.vbi.sampling_rate = 35468950;
  40                 f->fmt.vbi.start[0] = 7 -1;
  41                 f->fmt.vbi.start[1] = 319 -1;
  42         }
  43 }
  44
  45 int cx8800_start_vbi_dma(struct cx8800_dev    *dev,
  46                          struct cx88_dmaqueue *q,
  47                          struct cx88_buffer   *buf)
  48 {
  49         /* setup fifo + format */
  50         cx88_sram_channel_setup(dev, &cx88_sram_channels[SRAM_CH24],
  51                                 buf->vb.width, buf->risc.dma);
  52
  53         cx_write(MO_VBOS_CONTROL, ( (1 << 18) |  // comb filter delay fixup
  54                                     (1 << 15) |  // enable vbi capture
  55                                     (1 << 11) ));
  56
  57         /* reset counter */
  58         cx_write(MO_VBI_GPCNTRL,0x3);
  59         q->count = 1;
  60
  61         /* enable irqs */
  62         cx_set(MO_PCI_INTMSK, 0x00fc01);
  63         cx_set(MO_VID_INTMSK, 0x0f0088);
  64
  65         /* enable capture */
  66         cx_set(VID_CAPTURE_CONTROL,0x18);
  67
  68         /* start dma */
  69         cx_set(MO_DEV_CNTRL2, (1<<5));
  70         cx_set(MO_VID_DMACNTRL, 0x88);
  71
  72         return 0;
  73 }
  74
  75 int cx8800_restart_vbi_queue(struct cx8800_dev    *dev,
  76                              struct cx88_dmaqueue *q)
  77 {
  78         struct cx88_buffer *buf;
  79         struct list_head *item;
  80
  81         if (list_empty(&q->active))
  82                 return 0;
  83
  84         buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
  85         dprintk(2,"restart_queue [%p/%d]: restart dma\n",
  86                 buf, buf->vb.i);
  87         cx8800_start_vbi_dma(dev, q, buf);
  88         list_for_each(item,&q->active) {
  89                 buf = list_entry(item, struct cx88_buffer, vb.queue);
  90                 buf->count = q->count++;
  91         }
  92         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
  93         return 0;
  94 }
  95
  96 void cx8800_vbi_timeout(unsigned long data)
  97 {
  98         struct cx8800_dev *dev = (struct cx8800_dev*)data;
  99         struct cx88_dmaqueue *q = &dev->vbiq;
 100         struct cx88_buffer *buf;
 101         unsigned long flags;
 102
 103         cx88_sram_channel_dump(dev, &cx88_sram_channels[SRAM_CH24]);
 104
 105         cx_clear(MO_VID_DMACNTRL, 0x88);
 106         cx_clear(VID_CAPTURE_CONTROL, 0x18);
 107
 108         spin_lock_irqsave(&dev->slock,flags);
 109         while (!list_empty(&q->active)) {
 110                 buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
 111                 list_del(&buf->vb.queue);
 112                 buf->vb.state = STATE_ERROR;
 113                 wake_up(&buf->vb.done);
 114                 printk("%s: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
 115                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 116         }
 117         cx8800_restart_vbi_queue(dev,q);
 118         spin_unlock_irqrestore(&dev->slock,flags);
 119 }
 120
 121 /* ------------------------------------------------------------------ */
 122
 123 static int
 124 vbi_setup(struct file *file, unsigned int *count, unsigned int *size)
 125 {
 126         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 127         if (0 == *count)
 128                 *count = vbibufs;
 129         if (*count < 2)
 130                 *count = 2;
 131         if (*count > 32)
 132                 *count = 32;
 133         return 0;
 134 }
 135
 136 static int
 137 vbi_prepare(struct file *file, struct videobuf_buffer *vb,
 138             enum v4l2_field field)
 139 {
 140         struct cx8800_fh   *fh  = file->private_data;
 141         struct cx8800_dev  *dev = fh->dev;
 142         struct cx88_buffer *buf = (struct cx88_buffer*)vb;
 143         unsigned int size;
 144         int rc;
 145
 146         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 147         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 148                 return -EINVAL;
 149
 150         if (STATE_NEEDS_INIT == buf->vb.state) {
 151                 buf->vb.width  = VBI_LINE_LENGTH;
 152                 buf->vb.height = VBI_LINE_COUNT;
 153                 buf->vb.size   = size;
 154                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 155
 156                 if (0 != (rc = videobuf_iolock(dev->pci,&buf->vb,NULL)))
 157                         goto fail;
 158                 cx88_risc_buffer(dev->pci, &buf->risc,
 159                                  buf->vb.dma.sglist,
 160                                  0, buf->vb.width * buf->vb.height,
 161                                  buf->vb.width, 0,
 162                                  buf->vb.height);
 163         }
 164         buf->vb.state = STATE_PREPARED;
 165         return 0;
 166
 167  fail:
 168         cx88_free_buffer(dev->pci,buf);
 169         return rc;
 170 }
 171
 172 static void
 173 vbi_queue(struct file *file, struct videobuf_buffer *vb)
 174 {
 175         struct cx88_buffer    *buf  = (struct cx88_buffer*)vb;
 176         struct cx88_buffer    *prev;
 177         struct cx8800_fh      *fh   = file->private_data;
 178         struct cx8800_dev     *dev  = fh->dev;
 179         struct cx88_dmaqueue  *q    = &dev->vbiq;
 180
 181         /* add jump to stopper */
 182         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | 0x10000);
 183         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 184
 185         if (list_empty(&q->active)) {
 186                 list_add_tail(&buf->vb.queue,&q->active);
 187                 cx8800_start_vbi_dma(dev, q, buf);
 188                 buf->vb.state = STATE_ACTIVE;
 189                 buf->count    = q->count++;
 190                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 191                 dprintk(2,"[%p/%d] vbi_queue - first active\n",
 192                         buf, buf->vb.i);
 193
 194         } else {
 195                 prev = list_entry(q->active.prev, struct cx88_buffer, vb.queue);
 196                 list_add_tail(&buf->vb.queue,&q->active);
 197                 buf->vb.state = STATE_ACTIVE;
 198                 buf->count    = q->count++;
 199                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 200                 dprintk(2,"[%p/%d] buffer_queue - append to active\n",
 201                         buf, buf->vb.i);
 202         }
 203 }
 204
 205 static void vbi_release(struct file *file, struct videobuf_buffer *vb)
 206 {
 207         struct cx88_buffer *buf = (struct cx88_buffer*)vb;
 208         struct cx8800_fh   *fh  = file->private_data;
 209
 210         cx88_free_buffer(fh->dev->pci,buf);
 211 }
 212
 213 struct videobuf_queue_ops cx8800_vbi_qops = {
 214         .buf_setup    = vbi_setup,
 215         .buf_prepare  = vbi_prepare,
 216         .buf_queue    = vbi_queue,
 217         .buf_release  = vbi_release,
 218 };
 219
 220 /* ------------------------------------------------------------------ */
 221 /*
 222  * Local variables:
 223  * c-basic-offset: 8
 224  * End:
 225  */