drivers/media/pci/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/delay.h>
  28
  29 #include "saa7134-reg.h"
  30 #include "saa7134.h"
  31
  32 /* ------------------------------------------------------------------ */
  33
  34 static unsigned int ts_debug;
  35 module_param(ts_debug, int, 0644);
  36 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
  37
  38 #define dprintk(fmt, arg...)    if (ts_debug) \
  39         printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)
  40
  41 /* ------------------------------------------------------------------ */
  42
  43 static int buffer_activate(struct saa7134_dev *dev,
  44                            struct saa7134_buf *buf,
  45                            struct saa7134_buf *next)
  46 {
  47
  48         dprintk("buffer_activate [%p]",buf);
  49         buf->vb.state = VIDEOBUF_ACTIVE;
  50         buf->top_seen = 0;
  51
  52         if (NULL == next)
  53                 next = buf;
  54         if (V4L2_FIELD_TOP == buf->vb.field) {
  55                 dprintk("- [top]     buf=%p next=%p\n",buf,next);
  56                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
  57                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
  58         } else {
  59                 dprintk("- [bottom]  buf=%p next=%p\n",buf,next);
  60                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
  61                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
  62         }
  63
  64         /* start DMA */
  65         saa7134_set_dmabits(dev);
  66
  67         mod_timer(&dev->ts_q.timeout, jiffies+TS_BUFFER_TIMEOUT);
  68
  69         if (!dev->ts_started)
  70                 saa7134_ts_start(dev);
  71
  72         return 0;
  73 }
  74
  75 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  76                 enum v4l2_field field)
  77 {
  78         struct saa7134_dev *dev = q->priv_data;
  79         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  80         unsigned int lines, llength, size;
  81         int err;
  82
  83         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
  84
  85         llength = TS_PACKET_SIZE;
  86         lines = dev->ts.nr_packets;
  87
  88         size = lines * llength;
  89         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  90                 return -EINVAL;
  91
  92         if (buf->vb.size != size) {
  93                 saa7134_dma_free(q,buf);
  94         }
  95
  96         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
  97
  98                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  99
 100                 dprintk("buffer_prepare: needs_init\n");
 101
 102                 buf->vb.width  = llength;
 103                 buf->vb.height = lines;
 104                 buf->vb.size   = size;
 105                 buf->pt        = &dev->ts.pt_ts;
 106
 107                 err = videobuf_iolock(q,&buf->vb,NULL);
 108                 if (err)
 109                         goto oops;
 110                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 111                                             dma->sglist,
 112                                             dma->sglen,
 113                                             saa7134_buffer_startpage(buf));
 114                 if (err)
 115                         goto oops;
 116         }
 117
 118         buf->vb.state = VIDEOBUF_PREPARED;
 119         buf->activate = buffer_activate;
 120         buf->vb.field = field;
 121         return 0;
 122
 123  oops:
 124         saa7134_dma_free(q,buf);
 125         return err;
 126 }
 127
 128 static int
 129 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 130 {
 131         struct saa7134_dev *dev = q->priv_data;
 132
 133         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 134         if (0 == *count)
 135                 *count = dev->ts.nr_bufs;
 136         *count = saa7134_buffer_count(*size,*count);
 137
 138         return 0;
 139 }
 140
 141 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 142 {
 143         struct saa7134_dev *dev = q->priv_data;
 144         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 145
 146         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 147 }
 148
 149 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 150 {
 151         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 152         struct saa7134_dev *dev = q->priv_data;
 153
 154         if (dev->ts_started)
 155                 saa7134_ts_stop(dev);
 156
 157         saa7134_dma_free(q,buf);
 158 }
 159
 160 struct videobuf_queue_ops saa7134_ts_qops = {
 161         .buf_setup    = buffer_setup,
 162         .buf_prepare  = buffer_prepare,
 163         .buf_queue    = buffer_queue,
 164         .buf_release  = buffer_release,
 165 };
 166 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 167
 168 /* ----------------------------------------------------------- */
 169 /* exported stuff                                              */
 170
 171 static unsigned int tsbufs = 8;
 172 module_param(tsbufs, int, 0444);
 173 MODULE_PARM_DESC(tsbufs, "number of ts buffers for read/write IO, range 2-32");
 174
 175 static unsigned int ts_nr_packets = 64;
 176 module_param(ts_nr_packets, int, 0444);
 177 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 178
 179 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 180 {
 181         /* deactivate TS softreset */
 182         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 183         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 184         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 185         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 186         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 187         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 188         /* TSNOPIT=0, TSCOLAP=0 */
 189         saa_writeb(SAA7134_TS_DMA2,
 190                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 191
 192         return 0;
 193 }
 194
 195 int saa7134_ts_init1(struct saa7134_dev *dev)
 196 {
 197         /* sanitycheck insmod options */
 198         if (tsbufs < 2)
 199                 tsbufs = 2;
 200         if (tsbufs > VIDEO_MAX_FRAME)
 201                 tsbufs = VIDEO_MAX_FRAME;
 202         if (ts_nr_packets < 4)
 203                 ts_nr_packets = 4;
 204         if (ts_nr_packets > 312)
 205                 ts_nr_packets = 312;
 206         dev->ts.nr_bufs    = tsbufs;
 207         dev->ts.nr_packets = ts_nr_packets;
 208
 209         INIT_LIST_HEAD(&dev->ts_q.queue);
 210         init_timer(&dev->ts_q.timeout);
 211         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 212         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 213         dev->ts_q.dev              = dev;
 214         dev->ts_q.need_two         = 1;
 215         dev->ts_started            = 0;
 216         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 217
 218         /* init TS hw */
 219         saa7134_ts_init_hw(dev);
 220
 221         return 0;
 222 }
 223
 224 /* Function for stop TS */
 225 int saa7134_ts_stop(struct saa7134_dev *dev)
 226 {
 227         dprintk("TS stop\n");
 228
 229         BUG_ON(!dev->ts_started);
 230
 231         /* Stop TS stream */
 232         switch (saa7134_boards[dev->board].ts_type) {
 233         case SAA7134_MPEG_TS_PARALLEL:
 234                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 235                 dev->ts_started = 0;
 236                 break;
 237         case SAA7134_MPEG_TS_SERIAL:
 238                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 239                 dev->ts_started = 0;
 240                 break;
 241         }
 242         return 0;
 243 }
 244
 245 /* Function for start TS */
 246 int saa7134_ts_start(struct saa7134_dev *dev)
 247 {
 248         dprintk("TS start\n");
 249
 250         BUG_ON(dev->ts_started);
 251
 252         /* dma: setup channel 5 (= TS) */
 253         saa_writeb(SAA7134_TS_DMA0, (dev->ts.nr_packets - 1) & 0xff);
 254         saa_writeb(SAA7134_TS_DMA1,
 255                 ((dev->ts.nr_packets - 1) >> 8) & 0xff);
 256         /* TSNOPIT=0, TSCOLAP=0 */
 257         saa_writeb(SAA7134_TS_DMA2,
 258                 (((dev->ts.nr_packets - 1) >> 16) & 0x3f) | 0x00);
 259         saa_writel(SAA7134_RS_PITCH(5), TS_PACKET_SIZE);
 260         saa_writel(SAA7134_RS_CONTROL(5), SAA7134_RS_CONTROL_BURST_16 |
 261                                           SAA7134_RS_CONTROL_ME |
 262                                           (dev->ts.pt_ts.dma >> 12));
 263
 264         /* reset hardware TS buffers */
 265         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 266         saa_writeb(SAA7134_TS_SERIAL1, 0x03);
 267         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 268         saa_writeb(SAA7134_TS_SERIAL1, 0x01);
 269
 270         /* TS clock non-inverted */
 271         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 272
 273         /* Start TS stream */
 274         switch (saa7134_boards[dev->board].ts_type) {
 275         case SAA7134_MPEG_TS_PARALLEL:
 276                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 277                 saa_writeb(SAA7134_TS_PARALLEL, 0xec |
 278                         (saa7134_boards[dev->board].ts_force_val << 4));
 279                 break;
 280         case SAA7134_MPEG_TS_SERIAL:
 281                 saa_writeb(SAA7134_TS_SERIAL0, 0xd8);
 282                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c |
 283                         (saa7134_boards[dev->board].ts_force_val << 4));
 284                 saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 0xbc);
 285                 saa_writeb(SAA7134_TS_SERIAL1, 0x02);
 286                 break;
 287         }
 288
 289         dev->ts_started = 1;
 290
 291         return 0;
 292 }
 293
 294 int saa7134_ts_fini(struct saa7134_dev *dev)
 295 {
 296         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 297         return 0;
 298 }
 299
 300 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 301 {
 302         enum v4l2_field field;
 303
 304         spin_lock(&dev->slock);
 305         if (dev->ts_q.curr) {
 306                 field = dev->ts_q.curr->vb.field;
 307                 if (field == V4L2_FIELD_TOP) {
 308                         if ((status & 0x100000) != 0x000000)
 309                                 goto done;
 310                 } else {
 311                         if ((status & 0x100000) != 0x100000)
 312                                 goto done;
 313                 }
 314                 saa7134_buffer_finish(dev,&dev->ts_q,VIDEOBUF_DONE);
 315         }
 316         saa7134_buffer_next(dev,&dev->ts_q);
 317
 318  done:
 319         spin_unlock(&dev->slock);
 320 }
 321
 322 /* ----------------------------------------------------------- */
 323 /*
 324  * Local variables:
 325  * c-basic-offset: 8
 326  * End:
 327  */