drivers/media/video/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 #include <linux/slab.h>
  28
  29 #include "saa7134-reg.h"
  30 #include "saa7134.h"
  31
  32 /* ------------------------------------------------------------------ */
  33
  34 static unsigned int vbi_debug  = 0;
  35 module_param(vbi_debug, int, 0644);
  36 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
  37
  38 static unsigned int vbibufs = 4;
  39 module_param(vbibufs, int, 0444);
  40 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  41
  42 #define dprintk(fmt, arg...)    if (vbi_debug) \
  43         printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
  44
  45 /* ------------------------------------------------------------------ */
  46
  47 #define VBI_LINE_COUNT     16
  48 #define VBI_LINE_LENGTH  2048
  49 #define VBI_SCALE       0x200
  50
  51 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  52                       int task)
  53 {
  54         struct saa7134_tvnorm *norm = dev->tvnorm;
  55
  56         /* setup video scaler */
  57         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  58         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  59         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  60         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  61         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
  62         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
  63         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
  64         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
  65
  66         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  67         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  68         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  69         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  70
  71         saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width   & 0xff);
  72         saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width   >> 8);
  73         saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height  & 0xff);
  74         saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height  >> 8);
  75
  76         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  77 }
  78
  79 /* ------------------------------------------------------------------ */
  80
  81 static int buffer_activate(struct saa7134_dev *dev,
  82                            struct saa7134_buf *buf,
  83                            struct saa7134_buf *next)
  84 {
  85         unsigned long control,base;
  86
  87         dprintk("buffer_activate [%p]\n",buf);
  88         buf->vb.state = STATE_ACTIVE;
  89         buf->top_seen = 0;
  90
  91         task_init(dev,buf,TASK_A);
  92         task_init(dev,buf,TASK_B);
  93         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  94         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  95
  96         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  97         base    = saa7134_buffer_base(buf);
  98         control = SAA7134_RS_CONTROL_BURST_16 |
  99                 SAA7134_RS_CONTROL_ME |
 100                 (buf->pt->dma >> 12);
 101         saa_writel(SAA7134_RS_BA1(2),base);
 102         saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
 103         saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
 104         saa_writel(SAA7134_RS_CONTROL(2),control);
 105         saa_writel(SAA7134_RS_BA1(3),base);
 106         saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
 107         saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
 108         saa_writel(SAA7134_RS_CONTROL(3),control);
 109
 110         /* start DMA */
 111         saa7134_set_dmabits(dev);
 112         mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
 113
 114         return 0;
 115 }
 116
 117 static int buffer_prepare(struct videobuf_queue *q,
 118                           struct videobuf_buffer *vb,
 119                           enum v4l2_field field)
 120 {
 121         struct saa7134_fh *fh   = q->priv_data;
 122         struct saa7134_dev *dev = fh->dev;
 123         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 124         struct saa7134_tvnorm *norm = dev->tvnorm;
 125         unsigned int lines, llength, size;
 126         int err;
 127
 128         lines   = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
 129         if (lines > VBI_LINE_COUNT)
 130                 lines = VBI_LINE_COUNT;
 131         llength = VBI_LINE_LENGTH;
 132         size = lines * llength * 2;
 133         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 134                 return -EINVAL;
 135
 136         if (buf->vb.size != size)
 137                 saa7134_dma_free(q,buf);
 138
 139         if (STATE_NEEDS_INIT == buf->vb.state) {
 140                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
 141
 142                 buf->vb.width  = llength;
 143                 buf->vb.height = lines;
 144                 buf->vb.size   = size;
 145                 buf->pt        = &fh->pt_vbi;
 146
 147                 err = videobuf_iolock(q,&buf->vb,NULL);
 148                 if (err)
 149                         goto oops;
 150                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 151                                             dma->sglist,
 152                                             dma->sglen,
 153                                             saa7134_buffer_startpage(buf));
 154                 if (err)
 155                         goto oops;
 156         }
 157         buf->vb.state = STATE_PREPARED;
 158         buf->activate = buffer_activate;
 159         buf->vb.field = field;
 160         return 0;
 161
 162  oops:
 163         saa7134_dma_free(q,buf);
 164         return err;
 165 }
 166
 167 static int
 168 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 169 {
 170         struct saa7134_fh *fh   = q->priv_data;
 171         struct saa7134_dev *dev = fh->dev;
 172         int llength,lines;
 173
 174         lines   = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
 175         llength = VBI_LINE_LENGTH;
 176         *size = lines * llength * 2;
 177         if (0 == *count)
 178                 *count = vbibufs;
 179         *count = saa7134_buffer_count(*size,*count);
 180         return 0;
 181 }
 182
 183 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 184 {
 185         struct saa7134_fh *fh = q->priv_data;
 186         struct saa7134_dev *dev = fh->dev;
 187         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 188
 189         saa7134_buffer_queue(dev,&dev->vbi_q,buf);
 190 }
 191
 192 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 193 {
 194         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 195
 196         saa7134_dma_free(q,buf);
 197 }
 198
 199 struct videobuf_queue_ops saa7134_vbi_qops = {
 200         .buf_setup    = buffer_setup,
 201         .buf_prepare  = buffer_prepare,
 202         .buf_queue    = buffer_queue,
 203         .buf_release  = buffer_release,
 204 };
 205
 206 /* ------------------------------------------------------------------ */
 207
 208 int saa7134_vbi_init1(struct saa7134_dev *dev)
 209 {
 210         INIT_LIST_HEAD(&dev->vbi_q.queue);
 211         init_timer(&dev->vbi_q.timeout);
 212         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 213         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 214         dev->vbi_q.dev              = dev;
 215
 216         if (vbibufs < 2)
 217                 vbibufs = 2;
 218         if (vbibufs > VIDEO_MAX_FRAME)
 219                 vbibufs = VIDEO_MAX_FRAME;
 220         return 0;
 221 }
 222
 223 int saa7134_vbi_fini(struct saa7134_dev *dev)
 224 {
 225         /* nothing */
 226         return 0;
 227 }
 228
 229 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 230 {
 231         spin_lock(&dev->slock);
 232         if (dev->vbi_q.curr) {
 233                 dev->vbi_fieldcount++;
 234                 /* make sure we have seen both fields */
 235                 if ((status & 0x10) == 0x00) {
 236                         dev->vbi_q.curr->top_seen = 1;
 237                         goto done;
 238                 }
 239                 if (!dev->vbi_q.curr->top_seen)
 240                         goto done;
 241
 242                 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
 243                 saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
 244         }
 245         saa7134_buffer_next(dev,&dev->vbi_q);
 246
 247  done:
 248         spin_unlock(&dev->slock);
 249 }
 250
 251 /* ----------------------------------------------------------- */
 252 /*
 253  * Local variables:
 254  * c-basic-offset: 8
 255  * End:
 256  */