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+TS_BUFFER_TIMEOUT);
  69
  70         if (!dev->ts_started)
  71                 saa7134_ts_start(dev);
  72
  73         return 0;
  74 }
  75
  76 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  77                 enum v4l2_field field)
  78 {
  79         struct saa7134_dev *dev = q->priv_data;
  80         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  81         unsigned int lines, llength, size;
  82         int err;
  83
  84         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
  85
  86         llength = TS_PACKET_SIZE;
  87         lines = dev->ts.nr_packets;
  88
  89         size = lines * llength;
  90         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  91                 return -EINVAL;
  92
  93         if (buf->vb.size != size) {
  94                 saa7134_dma_free(q,buf);
  95         }
  96
  97         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
  98
  99                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
 100
 101                 dprintk("buffer_prepare: needs_init\n");
 102
 103                 buf->vb.width  = llength;
 104                 buf->vb.height = lines;
 105                 buf->vb.size   = size;
 106                 buf->pt        = &dev->ts.pt_ts;
 107
 108                 err = videobuf_iolock(q,&buf->vb,NULL);
 109                 if (err)
 110                         goto oops;
 111                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 112                                             dma->sglist,
 113                                             dma->sglen,
 114                                             saa7134_buffer_startpage(buf));
 115                 if (err)
 116                         goto oops;
 117         }
 118
 119         buf->vb.state = VIDEOBUF_PREPARED;
 120         buf->activate = buffer_activate;
 121         buf->vb.field = field;
 122         return 0;
 123
 124  oops:
 125         saa7134_dma_free(q,buf);
 126         return err;
 127 }
 128
 129 static int
 130 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 131 {
 132         struct saa7134_dev *dev = q->priv_data;
 133
 134         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 135         if (0 == *count)
 136                 *count = dev->ts.nr_bufs;
 137         *count = saa7134_buffer_count(*size,*count);
 138
 139         return 0;
 140 }
 141
 142 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 143 {
 144         struct saa7134_dev *dev = q->priv_data;
 145         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 146
 147         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 148 }
 149
 150 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 151 {
 152         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 153         struct saa7134_dev *dev = q->priv_data;
 154
 155         if (dev->ts_started)
 156                 saa7134_ts_stop(dev);
 157
 158         saa7134_dma_free(q,buf);
 159 }
 160
 161 struct videobuf_queue_ops saa7134_ts_qops = {
 162         .buf_setup    = buffer_setup,
 163         .buf_prepare  = buffer_prepare,
 164         .buf_queue    = buffer_queue,
 165         .buf_release  = buffer_release,
 166 };
 167 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 168
 169 /* ----------------------------------------------------------- */
 170 /* exported stuff                                              */
 171
 172 static unsigned int tsbufs = 8;
 173 module_param(tsbufs, int, 0444);
 174 MODULE_PARM_DESC(tsbufs, "number of ts buffers for read/write IO, range 2-32");
 175
 176 static unsigned int ts_nr_packets = 64;
 177 module_param(ts_nr_packets, int, 0444);
 178 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 179
 180 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 181 {
 182         /* deactivate TS softreset */
 183         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 184         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 185         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 186         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 187         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 188         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 189         /* TSNOPIT=0, TSCOLAP=0 */
 190         saa_writeb(SAA7134_TS_DMA2,
 191                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 192
 193         return 0;
 194 }
 195
 196 int saa7134_ts_init1(struct saa7134_dev *dev)
 197 {
 198         /* sanitycheck insmod options */
 199         if (tsbufs < 2)
 200                 tsbufs = 2;
 201         if (tsbufs > VIDEO_MAX_FRAME)
 202                 tsbufs = VIDEO_MAX_FRAME;
 203         if (ts_nr_packets < 4)
 204                 ts_nr_packets = 4;
 205         if (ts_nr_packets > 312)
 206                 ts_nr_packets = 312;
 207         dev->ts.nr_bufs    = tsbufs;
 208         dev->ts.nr_packets = ts_nr_packets;
 209
 210         INIT_LIST_HEAD(&dev->ts_q.queue);
 211         init_timer(&dev->ts_q.timeout);
 212         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 213         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 214         dev->ts_q.dev              = dev;
 215         dev->ts_q.need_two         = 1;
 216         dev->ts_started            = 0;
 217         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 218
 219         /* init TS hw */
 220         saa7134_ts_init_hw(dev);
 221
 222         return 0;
 223 }
 224
 225 /* Function for stop TS */
 226 int saa7134_ts_stop(struct saa7134_dev *dev)
 227 {
 228         dprintk("TS stop\n");
 229
 230         BUG_ON(!dev->ts_started);
 231
 232         /* Stop TS stream */
 233         switch (saa7134_boards[dev->board].ts_type) {
 234         case SAA7134_MPEG_TS_PARALLEL:
 235                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 236                 dev->ts_started = 0;
 237                 break;
 238         case SAA7134_MPEG_TS_SERIAL:
 239                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 240                 dev->ts_started = 0;
 241                 break;
 242         }
 243         return 0;
 244 }
 245
 246 /* Function for start TS */
 247 int saa7134_ts_start(struct saa7134_dev *dev)
 248 {
 249         dprintk("TS start\n");
 250
 251         BUG_ON(dev->ts_started);
 252
 253         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 254         saa_writeb(SAA7134_TS_SERIAL1, 0x03);
 255         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 256         saa_writeb(SAA7134_TS_SERIAL1, 0x01);
 257
 258         /* TS clock non-inverted */
 259         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 260
 261         /* Start TS stream */
 262         switch (saa7134_boards[dev->board].ts_type) {
 263         case SAA7134_MPEG_TS_PARALLEL:
 264                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 265                 saa_writeb(SAA7134_TS_PARALLEL, 0xec |
 266                         (saa7134_boards[dev->board].ts_force_val << 4));
 267                 break;
 268         case SAA7134_MPEG_TS_SERIAL:
 269                 saa_writeb(SAA7134_TS_SERIAL0, 0xd8);
 270                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c |
 271                         (saa7134_boards[dev->board].ts_force_val << 4));
 272                 saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 0xbc);
 273                 saa_writeb(SAA7134_TS_SERIAL1, 0x02);
 274                 break;
 275         }
 276
 277         dev->ts_started = 1;
 278
 279         return 0;
 280 }
 281
 282 int saa7134_ts_fini(struct saa7134_dev *dev)
 283 {
 284         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 285         return 0;
 286 }
 287
 288 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 289 {
 290         enum v4l2_field field;
 291
 292         spin_lock(&dev->slock);
 293         if (dev->ts_q.curr) {
 294                 field = dev->ts_q.curr->vb.field;
 295                 if (field == V4L2_FIELD_TOP) {
 296                         if ((status & 0x100000) != 0x000000)
 297                                 goto done;
 298                 } else {
 299                         if ((status & 0x100000) != 0x100000)
 300                                 goto done;
 301                 }
 302                 saa7134_buffer_finish(dev,&dev->ts_q,VIDEOBUF_DONE);
 303         }
 304         saa7134_buffer_next(dev,&dev->ts_q);
 305
 306  done:
 307         spin_unlock(&dev->slock);
 308 }
 309
 310 /* ----------------------------------------------------------- */
 311 /*
 312  * Local variables:
 313  * c-basic-offset: 8
 314  * End:
 315  */