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

   1 /*
   2  *
   3  * device driver for philips saa7134 based TV cards
   4  * video4linux video interface
   5  *
   6  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/list.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27
  28 #include "saa7134-reg.h"
  29 #include "saa7134.h"
  30
  31 /* ------------------------------------------------------------------ */
  32
  33 static unsigned int vbi_debug;
  34 module_param(vbi_debug, int, 0644);
  35 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
  36
  37 static unsigned int vbibufs = 4;
  38 module_param(vbibufs, int, 0444);
  39 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  40
  41 #define dprintk(fmt, arg...)    if (vbi_debug) \
  42         printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
  43
  44 /* ------------------------------------------------------------------ */
  45
  46 #define VBI_LINE_COUNT     16
  47 #define VBI_LINE_LENGTH  2048
  48 #define VBI_SCALE       0x200
  49
  50 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  51                       int task)
  52 {
  53         struct saa7134_tvnorm *norm = dev->tvnorm;
  54
  55         /* setup video scaler */
  56         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  57         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  58         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  59         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  60         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
  61         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
  62         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
  63         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
  64
  65         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  66         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  67         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  68         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  69
  70         saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width   & 0xff);
  71         saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width   >> 8);
  72         saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height  & 0xff);
  73         saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height  >> 8);
  74
  75         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  76 }
  77
  78 /* ------------------------------------------------------------------ */
  79
  80 static int buffer_activate(struct saa7134_dev *dev,
  81                            struct saa7134_buf *buf,
  82                            struct saa7134_buf *next)
  83 {
  84         unsigned long control,base;
  85
  86         dprintk("buffer_activate [%p]\n",buf);
  87         buf->vb.state = VIDEOBUF_ACTIVE;
  88         buf->top_seen = 0;
  89
  90         task_init(dev,buf,TASK_A);
  91         task_init(dev,buf,TASK_B);
  92         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  93         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  94
  95         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  96         base    = saa7134_buffer_base(buf);
  97         control = SAA7134_RS_CONTROL_BURST_16 |
  98                 SAA7134_RS_CONTROL_ME |
  99                 (buf->pt->dma >> 12);
 100         saa_writel(SAA7134_RS_BA1(2),base);
 101         saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
 102         saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
 103         saa_writel(SAA7134_RS_CONTROL(2),control);
 104         saa_writel(SAA7134_RS_BA1(3),base);
 105         saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
 106         saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
 107         saa_writel(SAA7134_RS_CONTROL(3),control);
 108
 109         /* start DMA */
 110         saa7134_set_dmabits(dev);
 111         mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
 112
 113         return 0;
 114 }
 115
 116 static int buffer_prepare(struct videobuf_queue *q,
 117                           struct videobuf_buffer *vb,
 118                           enum v4l2_field field)
 119 {
 120         struct saa7134_dev *dev = q->priv_data;
 121         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 122         struct saa7134_tvnorm *norm = dev->tvnorm;
 123         unsigned int lines, llength, size;
 124         int err;
 125
 126         lines   = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
 127         if (lines > VBI_LINE_COUNT)
 128                 lines = VBI_LINE_COUNT;
 129         llength = VBI_LINE_LENGTH;
 130         size = lines * llength * 2;
 131         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 132                 return -EINVAL;
 133
 134         if (buf->vb.size != size)
 135                 saa7134_dma_free(q,buf);
 136
 137         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 138                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
 139
 140                 buf->vb.width  = llength;
 141                 buf->vb.height = lines;
 142                 buf->vb.size   = size;
 143                 buf->pt        = &dev->pt_vbi;
 144
 145                 err = videobuf_iolock(q,&buf->vb,NULL);
 146                 if (err)
 147                         goto oops;
 148                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 149                                             dma->sglist,
 150                                             dma->sglen,
 151                                             saa7134_buffer_startpage(buf));
 152                 if (err)
 153                         goto oops;
 154         }
 155         buf->vb.state = VIDEOBUF_PREPARED;
 156         buf->activate = buffer_activate;
 157         buf->vb.field = field;
 158         return 0;
 159
 160  oops:
 161         saa7134_dma_free(q,buf);
 162         return err;
 163 }
 164
 165 static int
 166 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 167 {
 168         struct saa7134_dev *dev = q->priv_data;
 169         int llength,lines;
 170
 171         lines   = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
 172         llength = VBI_LINE_LENGTH;
 173         *size = lines * llength * 2;
 174         if (0 == *count)
 175                 *count = vbibufs;
 176         *count = saa7134_buffer_count(*size,*count);
 177         return 0;
 178 }
 179
 180 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 181 {
 182         struct saa7134_dev *dev = q->priv_data;
 183         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 184
 185         saa7134_buffer_queue(dev,&dev->vbi_q,buf);
 186 }
 187
 188 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 189 {
 190         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 191
 192         saa7134_dma_free(q,buf);
 193 }
 194
 195 struct videobuf_queue_ops saa7134_vbi_qops = {
 196         .buf_setup    = buffer_setup,
 197         .buf_prepare  = buffer_prepare,
 198         .buf_queue    = buffer_queue,
 199         .buf_release  = buffer_release,
 200 };
 201
 202 /* ------------------------------------------------------------------ */
 203
 204 int saa7134_vbi_init1(struct saa7134_dev *dev)
 205 {
 206         INIT_LIST_HEAD(&dev->vbi_q.queue);
 207         init_timer(&dev->vbi_q.timeout);
 208         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 209         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 210         dev->vbi_q.dev              = dev;
 211
 212         if (vbibufs < 2)
 213                 vbibufs = 2;
 214         if (vbibufs > VIDEO_MAX_FRAME)
 215                 vbibufs = VIDEO_MAX_FRAME;
 216         return 0;
 217 }
 218
 219 int saa7134_vbi_fini(struct saa7134_dev *dev)
 220 {
 221         /* nothing */
 222         return 0;
 223 }
 224
 225 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 226 {
 227         spin_lock(&dev->slock);
 228         if (dev->vbi_q.curr) {
 229                 dev->vbi_fieldcount++;
 230                 /* make sure we have seen both fields */
 231                 if ((status & 0x10) == 0x00) {
 232                         dev->vbi_q.curr->top_seen = 1;
 233                         goto done;
 234                 }
 235                 if (!dev->vbi_q.curr->top_seen)
 236                         goto done;
 237
 238                 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
 239                 saa7134_buffer_finish(dev,&dev->vbi_q,VIDEOBUF_DONE);
 240         }
 241         saa7134_buffer_next(dev,&dev->vbi_q);
 242
 243  done:
 244         spin_unlock(&dev->slock);
 245 }
 246
 247 /* ----------------------------------------------------------- */
 248 /*
 249  * Local variables:
 250  * c-basic-offset: 8
 251  * End:
 252  */