drivers/media/video/saa7134/saa7134-vbi.c

   1 /*
   2  * $Id: saa7134-vbi.c,v 1.6 2004/12/10 12:33:39 kraxel Exp $
   3  *
   4  * device driver for philips saa7134 based TV cards
   5  * video4linux video interface
   6  *
   7  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30
  31 #include "saa7134-reg.h"
  32 #include "saa7134.h"
  33
  34 /* ------------------------------------------------------------------ */
  35
  36 static unsigned int vbi_debug  = 0;
  37 module_param(vbi_debug, int, 0644);
  38 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
  39
  40 static unsigned int vbibufs = 4;
  41 module_param(vbibufs, int, 0444);
  42 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  43
  44 #define dprintk(fmt, arg...)    if (vbi_debug) \
  45         printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
  46
  47 /* ------------------------------------------------------------------ */
  48
  49 #define VBI_LINE_COUNT     16
  50 #define VBI_LINE_LENGTH  2048
  51 #define VBI_SCALE       0x200
  52
  53 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  54                       int task)
  55 {
  56         struct saa7134_tvnorm *norm = dev->tvnorm;
  57
  58         /* setup video scaler */
  59         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  60         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  61         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  62         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  63         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start &  0xff);
  64         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start >> 8);
  65         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop  &  0xff);
  66         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop  >> 8);
  67
  68         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  69         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  70         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  71         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  72
  73         saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width   & 0xff);
  74         saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width   >> 8);
  75         saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height  & 0xff);
  76         saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height  >> 8);
  77
  78         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  79 }
  80
  81 /* ------------------------------------------------------------------ */
  82
  83 static int buffer_activate(struct saa7134_dev *dev,
  84                            struct saa7134_buf *buf,
  85                            struct saa7134_buf *next)
  86 {
  87         unsigned long control,base;
  88
  89         dprintk("buffer_activate [%p]\n",buf);
  90         buf->vb.state = STATE_ACTIVE;
  91         buf->top_seen = 0;
  92
  93         task_init(dev,buf,TASK_A);
  94         task_init(dev,buf,TASK_B);
  95         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  96         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  97
  98         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  99         base    = saa7134_buffer_base(buf);
 100         control = SAA7134_RS_CONTROL_BURST_16 |
 101                 SAA7134_RS_CONTROL_ME |
 102                 (buf->pt->dma >> 12);
 103         saa_writel(SAA7134_RS_BA1(2),base);
 104         saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
 105         saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
 106         saa_writel(SAA7134_RS_CONTROL(2),control);
 107         saa_writel(SAA7134_RS_BA1(3),base);
 108         saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
 109         saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
 110         saa_writel(SAA7134_RS_CONTROL(3),control);
 111
 112         /* start DMA */
 113         saa7134_set_dmabits(dev);
 114         mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
 115
 116         return 0;
 117 }
 118
 119 static int buffer_prepare(struct videobuf_queue *q,
 120                           struct videobuf_buffer *vb,
 121                           enum v4l2_field field)
 122 {
 123         struct saa7134_fh *fh   = q->priv_data;
 124         struct saa7134_dev *dev = fh->dev;
 125         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 126         struct saa7134_tvnorm *norm = dev->tvnorm;
 127         unsigned int lines, llength, size;
 128         int err;
 129
 130         lines   = norm->vbi_v_stop - norm->vbi_v_start +1;
 131         if (lines > VBI_LINE_COUNT)
 132                 lines = VBI_LINE_COUNT;
 133 #if 1
 134         llength = VBI_LINE_LENGTH;
 135 #else
 136         llength = (norm->h_stop - norm->h_start +1) * 2;
 137         if (llength > VBI_LINE_LENGTH)
 138                 llength = VBI_LINE_LENGTH;
 139 #endif
 140         size = lines * llength * 2;
 141         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 142                 return -EINVAL;
 143
 144         if (buf->vb.size != size)
 145                 saa7134_dma_free(dev,buf);
 146
 147         if (STATE_NEEDS_INIT == buf->vb.state) {
 148                 buf->vb.width  = llength;
 149                 buf->vb.height = lines;
 150                 buf->vb.size   = size;
 151                 buf->pt        = &fh->pt_vbi;
 152
 153                 err = videobuf_iolock(dev->pci,&buf->vb,NULL);
 154                 if (err)
 155                         goto oops;
 156                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 157                                             buf->vb.dma.sglist,
 158                                             buf->vb.dma.sglen,
 159                                             saa7134_buffer_startpage(buf));
 160                 if (err)
 161                         goto oops;
 162         }
 163         buf->vb.state = STATE_PREPARED;
 164         buf->activate = buffer_activate;
 165         buf->vb.field = field;
 166         return 0;
 167
 168  oops:
 169         saa7134_dma_free(dev,buf);
 170         return err;
 171 }
 172
 173 static int
 174 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 175 {
 176         struct saa7134_fh *fh   = q->priv_data;
 177         struct saa7134_dev *dev = fh->dev;
 178         int llength,lines;
 179
 180         lines   = dev->tvnorm->vbi_v_stop - dev->tvnorm->vbi_v_start +1;
 181 #if 1
 182         llength = VBI_LINE_LENGTH;
 183 #else
 184         llength = (norm->h_stop - norm->h_start +1) * 2;
 185         if (llength > VBI_LINE_LENGTH)
 186                 llength = VBI_LINE_LENGTH;
 187 #endif
 188         *size = lines * llength * 2;
 189         if (0 == *count)
 190                 *count = vbibufs;
 191         *count = saa7134_buffer_count(*size,*count);
 192         return 0;
 193 }
 194
 195 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 196 {
 197         struct saa7134_fh *fh = q->priv_data;
 198         struct saa7134_dev *dev = fh->dev;
 199         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 200
 201         saa7134_buffer_queue(dev,&dev->vbi_q,buf);
 202 }
 203
 204 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 205 {
 206         struct saa7134_fh *fh   = q->priv_data;
 207         struct saa7134_dev *dev = fh->dev;
 208         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 209
 210         saa7134_dma_free(dev,buf);
 211 }
 212
 213 struct videobuf_queue_ops saa7134_vbi_qops = {
 214         .buf_setup    = buffer_setup,
 215         .buf_prepare  = buffer_prepare,
 216         .buf_queue    = buffer_queue,
 217         .buf_release  = buffer_release,
 218 };
 219
 220 /* ------------------------------------------------------------------ */
 221
 222 int saa7134_vbi_init1(struct saa7134_dev *dev)
 223 {
 224         INIT_LIST_HEAD(&dev->vbi_q.queue);
 225         init_timer(&dev->vbi_q.timeout);
 226         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 227         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 228         dev->vbi_q.dev              = dev;
 229
 230         if (vbibufs < 2)
 231                 vbibufs = 2;
 232         if (vbibufs > VIDEO_MAX_FRAME)
 233                 vbibufs = VIDEO_MAX_FRAME;
 234         return 0;
 235 }
 236
 237 int saa7134_vbi_fini(struct saa7134_dev *dev)
 238 {
 239         /* nothing */
 240         return 0;
 241 }
 242
 243 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 244 {
 245         spin_lock(&dev->slock);
 246         if (dev->vbi_q.curr) {
 247                 dev->vbi_fieldcount++;
 248                 /* make sure we have seen both fields */
 249                 if ((status & 0x10) == 0x00) {
 250                         dev->vbi_q.curr->top_seen = 1;
 251                         goto done;
 252                 }
 253                 if (!dev->vbi_q.curr->top_seen)
 254                         goto done;
 255
 256                 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
 257                 saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
 258         }
 259         saa7134_buffer_next(dev,&dev->vbi_q);
 260
 261  done:
 262         spin_unlock(&dev->slock);
 263 }
 264
 265 /* ----------------------------------------------------------- */
 266 /*
 267  * Local variables:
 268  * c-basic-offset: 8
 269  * End:
 270  */