drivers/media/video/saa7134/saa7134-ts.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 #include <linux/delay.h>
  29
  30 #include "saa7134-reg.h"
  31 #include "saa7134.h"
  32
  33 /* ------------------------------------------------------------------ */
  34
  35 static unsigned int ts_debug;
  36 module_param(ts_debug, int, 0644);
  37 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
  38
  39 #define dprintk(fmt, arg...)    if (ts_debug) \
  40         printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)
  41
  42 /* ------------------------------------------------------------------ */
  43
  44 static int buffer_activate(struct saa7134_dev *dev,
  45                            struct saa7134_buf *buf,
  46                            struct saa7134_buf *next)
  47 {
  48
  49         dprintk("buffer_activate [%p]",buf);
  50         buf->vb.state = VIDEOBUF_ACTIVE;
  51         buf->top_seen = 0;
  52
  53         if (NULL == next)
  54                 next = buf;
  55         if (V4L2_FIELD_TOP == buf->vb.field) {
  56                 dprintk("- [top]     buf=%p next=%p\n",buf,next);
  57                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
  58                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
  59         } else {
  60                 dprintk("- [bottom]  buf=%p next=%p\n",buf,next);
  61                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
  62                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
  63         }
  64
  65         /* start DMA */
  66         saa7134_set_dmabits(dev);
  67
  68         mod_timer(&dev->ts_q.timeout, jiffies+BUFFER_TIMEOUT);
  69
  70         if (dev->ts_state == SAA7134_TS_BUFF_DONE) {
  71                 /* Clear TS cache */
  72                 dev->buff_cnt = 0;
  73                 saa_writeb(SAA7134_TS_SERIAL1, 0x00);
  74                 saa_writeb(SAA7134_TS_SERIAL1, 0x03);
  75                 saa_writeb(SAA7134_TS_SERIAL1, 0x00);
  76                 saa_writeb(SAA7134_TS_SERIAL1, 0x01);
  77
  78                 /* TS clock non-inverted */
  79                 saa_writeb(SAA7134_TS_SERIAL1, 0x00);
  80
  81                 /* Start TS stream */
  82                 switch (saa7134_boards[dev->board].ts_type) {
  83                 case SAA7134_MPEG_TS_PARALLEL:
  84                         saa_writeb(SAA7134_TS_SERIAL0, 0x40);
  85                         saa_writeb(SAA7134_TS_PARALLEL, 0xec);
  86                         break;
  87                 case SAA7134_MPEG_TS_SERIAL:
  88                         saa_writeb(SAA7134_TS_SERIAL0, 0xd8);
  89                         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
  90                         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 0xbc);
  91                         saa_writeb(SAA7134_TS_SERIAL1, 0x02);
  92                         break;
  93                 }
  94
  95                 dev->ts_state = SAA7134_TS_STARTED;
  96         }
  97
  98         return 0;
  99 }
 100
 101 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 102                 enum v4l2_field field)
 103 {
 104         struct saa7134_dev *dev = q->priv_data;
 105         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 106         unsigned int lines, llength, size;
 107         u32 control;
 108         int err;
 109
 110         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
 111
 112         llength = TS_PACKET_SIZE;
 113         lines = dev->ts.nr_packets;
 114
 115         size = lines * llength;
 116         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 117                 return -EINVAL;
 118
 119         if (buf->vb.size != size) {
 120                 saa7134_dma_free(q,buf);
 121         }
 122
 123         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 124                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
 125
 126                 buf->vb.width  = llength;
 127                 buf->vb.height = lines;
 128                 buf->vb.size   = size;
 129                 buf->pt        = &dev->ts.pt_ts;
 130
 131                 err = videobuf_iolock(q,&buf->vb,NULL);
 132                 if (err)
 133                         goto oops;
 134                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 135                                             dma->sglist,
 136                                             dma->sglen,
 137                                             saa7134_buffer_startpage(buf));
 138                 if (err)
 139                         goto oops;
 140         }
 141
 142         dev->buff_cnt++;
 143
 144         if (dev->buff_cnt == dev->ts.nr_bufs) {
 145                 dev->ts_state = SAA7134_TS_BUFF_DONE;
 146                 /* dma: setup channel 5 (= TS) */
 147                 control = SAA7134_RS_CONTROL_BURST_16 |
 148                         SAA7134_RS_CONTROL_ME |
 149                         (buf->pt->dma >> 12);
 150
 151                 saa_writeb(SAA7134_TS_DMA0, (lines - 1) & 0xff);
 152                 saa_writeb(SAA7134_TS_DMA1, ((lines - 1) >> 8) & 0xff);
 153                 /* TSNOPIT=0, TSCOLAP=0 */
 154                 saa_writeb(SAA7134_TS_DMA2, (((lines - 1) >> 16) & 0x3f) | 0x00);
 155                 saa_writel(SAA7134_RS_PITCH(5), TS_PACKET_SIZE);
 156                 saa_writel(SAA7134_RS_CONTROL(5), control);
 157         }
 158
 159         buf->vb.state = VIDEOBUF_PREPARED;
 160         buf->activate = buffer_activate;
 161         buf->vb.field = field;
 162         return 0;
 163
 164  oops:
 165         saa7134_dma_free(q,buf);
 166         return err;
 167 }
 168
 169 static int
 170 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 171 {
 172         struct saa7134_dev *dev = q->priv_data;
 173
 174         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 175         if (0 == *count)
 176                 *count = dev->ts.nr_bufs;
 177         *count = saa7134_buffer_count(*size,*count);
 178         dev->buff_cnt = 0;
 179         dev->ts_state = SAA7134_TS_STOPPED;
 180         return 0;
 181 }
 182
 183 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 184 {
 185         struct saa7134_dev *dev = q->priv_data;
 186         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 187
 188         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 189 }
 190
 191 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 192 {
 193         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 194         struct saa7134_dev *dev = q->priv_data;
 195
 196         if (dev->ts_state == SAA7134_TS_STARTED) {
 197                 /* Stop TS transport */
 198                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 199                 dev->ts_state = SAA7134_TS_STOPPED;
 200         }
 201         saa7134_dma_free(q,buf);
 202 }
 203
 204 struct videobuf_queue_ops saa7134_ts_qops = {
 205         .buf_setup    = buffer_setup,
 206         .buf_prepare  = buffer_prepare,
 207         .buf_queue    = buffer_queue,
 208         .buf_release  = buffer_release,
 209 };
 210 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 211
 212 /* ----------------------------------------------------------- */
 213 /* exported stuff                                              */
 214
 215 static unsigned int tsbufs = 8;
 216 module_param(tsbufs, int, 0444);
 217 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
 218
 219 static unsigned int ts_nr_packets = 64;
 220 module_param(ts_nr_packets, int, 0444);
 221 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 222
 223 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 224 {
 225         /* deactivate TS softreset */
 226         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 227         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 228         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 229         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 230         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 231         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 232         /* TSNOPIT=0, TSCOLAP=0 */
 233         saa_writeb(SAA7134_TS_DMA2,
 234                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 235
 236         return 0;
 237 }
 238
 239 int saa7134_ts_init1(struct saa7134_dev *dev)
 240 {
 241         /* sanitycheck insmod options */
 242         if (tsbufs < 2)
 243                 tsbufs = 2;
 244         if (tsbufs > VIDEO_MAX_FRAME)
 245                 tsbufs = VIDEO_MAX_FRAME;
 246         if (ts_nr_packets < 4)
 247                 ts_nr_packets = 4;
 248         if (ts_nr_packets > 312)
 249                 ts_nr_packets = 312;
 250         dev->ts.nr_bufs    = tsbufs;
 251         dev->ts.nr_packets = ts_nr_packets;
 252
 253         INIT_LIST_HEAD(&dev->ts_q.queue);
 254         init_timer(&dev->ts_q.timeout);
 255         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 256         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 257         dev->ts_q.dev              = dev;
 258         dev->ts_q.need_two         = 1;
 259         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 260
 261         /* init TS hw */
 262         saa7134_ts_init_hw(dev);
 263
 264         return 0;
 265 }
 266
 267 int saa7134_ts_fini(struct saa7134_dev *dev)
 268 {
 269         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 270         return 0;
 271 }
 272
 273
 274 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 275 {
 276         enum v4l2_field field;
 277
 278         spin_lock(&dev->slock);
 279         if (dev->ts_q.curr) {
 280                 field = dev->ts_q.curr->vb.field;
 281                 if (field == V4L2_FIELD_TOP) {
 282                         if ((status & 0x100000) != 0x000000)
 283                                 goto done;
 284                 } else {
 285                         if ((status & 0x100000) != 0x100000)
 286                                 goto done;
 287                 }
 288                 saa7134_buffer_finish(dev,&dev->ts_q,VIDEOBUF_DONE);
 289         }
 290         saa7134_buffer_next(dev,&dev->ts_q);
 291
 292  done:
 293         spin_unlock(&dev->slock);
 294 }
 295
 296 /* ----------------------------------------------------------- */
 297 /*
 298  * Local variables:
 299  * c-basic-offset: 8
 300  * End:
 301  */