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

   1 /*
   2  */
   3 #include <linux/kernel.h>
   4 #include <linux/module.h>
   5 #include <linux/moduleparam.h>
   6 #include <linux/init.h>
   7 #include <linux/slab.h>
   8
   9 #include "cx88.h"
  10
  11 static unsigned int vbibufs = 4;
  12 module_param(vbibufs,int,0644);
  13 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  14
  15 static unsigned int vbi_debug = 0;
  16 module_param(vbi_debug,int,0644);
  17 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
  18
  19 #define dprintk(level,fmt, arg...)      if (vbi_debug >= level) \
  20         printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg)
  21
  22 /* ------------------------------------------------------------------ */
  23
  24 int cx8800_vbi_fmt (struct file *file, void *priv,
  25                                         struct v4l2_format *f)
  26 {
  27         struct cx8800_fh  *fh   = priv;
  28         struct cx8800_dev *dev  = fh->dev;
  29
  30         f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
  31         f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
  32         f->fmt.vbi.offset = 244;
  33         f->fmt.vbi.count[0] = VBI_LINE_COUNT;
  34         f->fmt.vbi.count[1] = VBI_LINE_COUNT;
  35
  36         if (dev->core->tvnorm & V4L2_STD_525_60) {
  37                 /* ntsc */
  38                 f->fmt.vbi.sampling_rate = 28636363;
  39                 f->fmt.vbi.start[0] = 10;
  40                 f->fmt.vbi.start[1] = 273;
  41
  42         } else if (dev->core->tvnorm & V4L2_STD_625_50) {
  43                 /* pal */
  44                 f->fmt.vbi.sampling_rate = 35468950;
  45                 f->fmt.vbi.start[0] = 7 -1;
  46                 f->fmt.vbi.start[1] = 319 -1;
  47         }
  48         return 0;
  49 }
  50
  51 static int cx8800_start_vbi_dma(struct cx8800_dev    *dev,
  52                          struct cx88_dmaqueue *q,
  53                          struct cx88_buffer   *buf)
  54 {
  55         struct cx88_core *core = dev->core;
  56
  57         /* setup fifo + format */
  58         cx88_sram_channel_setup(dev->core, &cx88_sram_channels[SRAM_CH24],
  59                                 buf->vb.width, buf->risc.dma);
  60
  61         cx_write(MO_VBOS_CONTROL, ( (1 << 18) |  // comb filter delay fixup
  62                                     (1 << 15) |  // enable vbi capture
  63                                     (1 << 11) ));
  64
  65         /* reset counter */
  66         cx_write(MO_VBI_GPCNTRL, GP_COUNT_CONTROL_RESET);
  67         q->count = 1;
  68
  69         /* enable irqs */
  70         cx_set(MO_PCI_INTMSK, core->pci_irqmask | 0x01);
  71         cx_set(MO_VID_INTMSK, 0x0f0088);
  72
  73         /* enable capture */
  74         cx_set(VID_CAPTURE_CONTROL,0x18);
  75
  76         /* start dma */
  77         cx_set(MO_DEV_CNTRL2, (1<<5));
  78         cx_set(MO_VID_DMACNTRL, 0x88);
  79
  80         return 0;
  81 }
  82
  83 int cx8800_stop_vbi_dma(struct cx8800_dev *dev)
  84 {
  85         struct cx88_core *core = dev->core;
  86
  87         /* stop dma */
  88         cx_clear(MO_VID_DMACNTRL, 0x88);
  89
  90         /* disable capture */
  91         cx_clear(VID_CAPTURE_CONTROL,0x18);
  92
  93         /* disable irqs */
  94         cx_clear(MO_PCI_INTMSK, 0x000001);
  95         cx_clear(MO_VID_INTMSK, 0x0f0088);
  96         return 0;
  97 }
  98
  99 int cx8800_restart_vbi_queue(struct cx8800_dev    *dev,
 100                              struct cx88_dmaqueue *q)
 101 {
 102         struct cx88_buffer *buf;
 103         struct list_head *item;
 104
 105         if (list_empty(&q->active))
 106                 return 0;
 107
 108         buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
 109         dprintk(2,"restart_queue [%p/%d]: restart dma\n",
 110                 buf, buf->vb.i);
 111         cx8800_start_vbi_dma(dev, q, buf);
 112         list_for_each(item,&q->active) {
 113                 buf = list_entry(item, struct cx88_buffer, vb.queue);
 114                 buf->count = q->count++;
 115         }
 116         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 117         return 0;
 118 }
 119
 120 void cx8800_vbi_timeout(unsigned long data)
 121 {
 122         struct cx8800_dev *dev = (struct cx8800_dev*)data;
 123         struct cx88_core *core = dev->core;
 124         struct cx88_dmaqueue *q = &dev->vbiq;
 125         struct cx88_buffer *buf;
 126         unsigned long flags;
 127
 128         cx88_sram_channel_dump(dev->core, &cx88_sram_channels[SRAM_CH24]);
 129
 130         cx_clear(MO_VID_DMACNTRL, 0x88);
 131         cx_clear(VID_CAPTURE_CONTROL, 0x18);
 132
 133         spin_lock_irqsave(&dev->slock,flags);
 134         while (!list_empty(&q->active)) {
 135                 buf = list_entry(q->active.next, struct cx88_buffer, vb.queue);
 136                 list_del(&buf->vb.queue);
 137                 buf->vb.state = STATE_ERROR;
 138                 wake_up(&buf->vb.done);
 139                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->core->name,
 140                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 141         }
 142         cx8800_restart_vbi_queue(dev,q);
 143         spin_unlock_irqrestore(&dev->slock,flags);
 144 }
 145
 146 /* ------------------------------------------------------------------ */
 147
 148 static int
 149 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 150 {
 151         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 152         if (0 == *count)
 153                 *count = vbibufs;
 154         if (*count < 2)
 155                 *count = 2;
 156         if (*count > 32)
 157                 *count = 32;
 158         return 0;
 159 }
 160
 161 static int
 162 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 163             enum v4l2_field field)
 164 {
 165         struct cx8800_fh   *fh  = q->priv_data;
 166         struct cx8800_dev  *dev = fh->dev;
 167         struct cx88_buffer *buf = container_of(vb,struct cx88_buffer,vb);
 168         unsigned int size;
 169         int rc;
 170
 171         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 172         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 173                 return -EINVAL;
 174
 175         if (STATE_NEEDS_INIT == buf->vb.state) {
 176                 buf->vb.width  = VBI_LINE_LENGTH;
 177                 buf->vb.height = VBI_LINE_COUNT;
 178                 buf->vb.size   = size;
 179                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 180
 181                 if (0 != (rc = videobuf_iolock(q,&buf->vb,NULL)))
 182                         goto fail;
 183                 cx88_risc_buffer(dev->pci, &buf->risc,
 184                                  buf->vb.dma.sglist,
 185                                  0, buf->vb.width * buf->vb.height,
 186                                  buf->vb.width, 0,
 187                                  buf->vb.height);
 188         }
 189         buf->vb.state = STATE_PREPARED;
 190         return 0;
 191
 192  fail:
 193         cx88_free_buffer(q,buf);
 194         return rc;
 195 }
 196
 197 static void
 198 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 199 {
 200         struct cx88_buffer    *buf = container_of(vb,struct cx88_buffer,vb);
 201         struct cx88_buffer    *prev;
 202         struct cx8800_fh      *fh   = vq->priv_data;
 203         struct cx8800_dev     *dev  = fh->dev;
 204         struct cx88_dmaqueue  *q    = &dev->vbiq;
 205
 206         /* add jump to stopper */
 207         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 208         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 209
 210         if (list_empty(&q->active)) {
 211                 list_add_tail(&buf->vb.queue,&q->active);
 212                 cx8800_start_vbi_dma(dev, q, buf);
 213                 buf->vb.state = STATE_ACTIVE;
 214                 buf->count    = q->count++;
 215                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 216                 dprintk(2,"[%p/%d] vbi_queue - first active\n",
 217                         buf, buf->vb.i);
 218
 219         } else {
 220                 prev = list_entry(q->active.prev, struct cx88_buffer, vb.queue);
 221                 list_add_tail(&buf->vb.queue,&q->active);
 222                 buf->vb.state = STATE_ACTIVE;
 223                 buf->count    = q->count++;
 224                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 225                 dprintk(2,"[%p/%d] buffer_queue - append to active\n",
 226                         buf, buf->vb.i);
 227         }
 228 }
 229
 230 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 231 {
 232         struct cx88_buffer *buf = container_of(vb,struct cx88_buffer,vb);
 233
 234         cx88_free_buffer(q,buf);
 235 }
 236
 237 struct videobuf_queue_ops cx8800_vbi_qops = {
 238         .buf_setup    = vbi_setup,
 239         .buf_prepare  = vbi_prepare,
 240         .buf_queue    = vbi_queue,
 241         .buf_release  = vbi_release,
 242 };
 243
 244 /* ------------------------------------------------------------------ */
 245 /*
 246  * Local variables:
 247  * c-basic-offset: 8
 248  * End:
 249  */