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                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
  83                 saa_writeb(SAA7134_TS_PARALLEL, 0xEC);
  84                 dev->ts_state = SAA7134_TS_STARTED;
  85         }
  86
  87         return 0;
  88 }
  89
  90 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  91                 enum v4l2_field field)
  92 {
  93         struct saa7134_dev *dev = q->priv_data;
  94         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  95         unsigned int lines, llength, size;
  96         u32 control;
  97         int err;
  98
  99         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
 100
 101         llength = TS_PACKET_SIZE;
 102         lines = dev->ts.nr_packets;
 103
 104         size = lines * llength;
 105         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 106                 return -EINVAL;
 107
 108         if (buf->vb.size != size) {
 109                 saa7134_dma_free(q,buf);
 110         }
 111
 112         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 113                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
 114
 115                 buf->vb.width  = llength;
 116                 buf->vb.height = lines;
 117                 buf->vb.size   = size;
 118                 buf->pt        = &dev->ts.pt_ts;
 119
 120                 err = videobuf_iolock(q,&buf->vb,NULL);
 121                 if (err)
 122                         goto oops;
 123                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 124                                             dma->sglist,
 125                                             dma->sglen,
 126                                             saa7134_buffer_startpage(buf));
 127                 if (err)
 128                         goto oops;
 129         }
 130
 131         dev->buff_cnt++;
 132
 133         if (dev->buff_cnt == dev->ts.nr_bufs) {
 134                 dev->ts_state = SAA7134_TS_BUFF_DONE;
 135                 /* dma: setup channel 5 (= TS) */
 136                 control = SAA7134_RS_CONTROL_BURST_16 |
 137                         SAA7134_RS_CONTROL_ME |
 138                         (buf->pt->dma >> 12);
 139
 140                 saa_writeb(SAA7134_TS_DMA0, (lines - 1) & 0xff);
 141                 saa_writeb(SAA7134_TS_DMA1, ((lines - 1) >> 8) & 0xff);
 142                 /* TSNOPIT=0, TSCOLAP=0 */
 143                 saa_writeb(SAA7134_TS_DMA2, (((lines - 1) >> 16) & 0x3f) | 0x00);
 144                 saa_writel(SAA7134_RS_PITCH(5), TS_PACKET_SIZE);
 145                 saa_writel(SAA7134_RS_CONTROL(5), control);
 146         }
 147
 148         buf->vb.state = VIDEOBUF_PREPARED;
 149         buf->activate = buffer_activate;
 150         buf->vb.field = field;
 151         return 0;
 152
 153  oops:
 154         saa7134_dma_free(q,buf);
 155         return err;
 156 }
 157
 158 static int
 159 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 160 {
 161         struct saa7134_dev *dev = q->priv_data;
 162
 163         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 164         if (0 == *count)
 165                 *count = dev->ts.nr_bufs;
 166         *count = saa7134_buffer_count(*size,*count);
 167         dev->buff_cnt = 0;
 168         dev->ts_state = SAA7134_TS_STOPPED;
 169         return 0;
 170 }
 171
 172 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 173 {
 174         struct saa7134_dev *dev = q->priv_data;
 175         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 176
 177         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 178 }
 179
 180 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 181 {
 182         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 183         struct saa7134_dev *dev = q->priv_data;
 184
 185         if (dev->ts_state == SAA7134_TS_STARTED) {
 186                 /* Stop TS transport */
 187                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 188                 dev->ts_state = SAA7134_TS_STOPPED;
 189         }
 190         saa7134_dma_free(q,buf);
 191 }
 192
 193 struct videobuf_queue_ops saa7134_ts_qops = {
 194         .buf_setup    = buffer_setup,
 195         .buf_prepare  = buffer_prepare,
 196         .buf_queue    = buffer_queue,
 197         .buf_release  = buffer_release,
 198 };
 199 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 200
 201 /* ----------------------------------------------------------- */
 202 /* exported stuff                                              */
 203
 204 static unsigned int tsbufs = 8;
 205 module_param(tsbufs, int, 0444);
 206 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
 207
 208 static unsigned int ts_nr_packets = 64;
 209 module_param(ts_nr_packets, int, 0444);
 210 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 211
 212 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 213 {
 214         /* deactivate TS softreset */
 215         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 216         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 217         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 218         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 219         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 220         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 221         /* TSNOPIT=0, TSCOLAP=0 */
 222         saa_writeb(SAA7134_TS_DMA2,
 223                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 224
 225         return 0;
 226 }
 227
 228 int saa7134_ts_init1(struct saa7134_dev *dev)
 229 {
 230         /* sanitycheck insmod options */
 231         if (tsbufs < 2)
 232                 tsbufs = 2;
 233         if (tsbufs > VIDEO_MAX_FRAME)
 234                 tsbufs = VIDEO_MAX_FRAME;
 235         if (ts_nr_packets < 4)
 236                 ts_nr_packets = 4;
 237         if (ts_nr_packets > 312)
 238                 ts_nr_packets = 312;
 239         dev->ts.nr_bufs    = tsbufs;
 240         dev->ts.nr_packets = ts_nr_packets;
 241
 242         INIT_LIST_HEAD(&dev->ts_q.queue);
 243         init_timer(&dev->ts_q.timeout);
 244         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 245         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 246         dev->ts_q.dev              = dev;
 247         dev->ts_q.need_two         = 1;
 248         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 249
 250         /* init TS hw */
 251         saa7134_ts_init_hw(dev);
 252
 253         return 0;
 254 }
 255
 256 int saa7134_ts_fini(struct saa7134_dev *dev)
 257 {
 258         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 259         return 0;
 260 }
 261
 262
 263 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 264 {
 265         enum v4l2_field field;
 266
 267         spin_lock(&dev->slock);
 268         if (dev->ts_q.curr) {
 269                 field = dev->ts_q.curr->vb.field;
 270                 if (field == V4L2_FIELD_TOP) {
 271                         if ((status & 0x100000) != 0x000000)
 272                                 goto done;
 273                 } else {
 274                         if ((status & 0x100000) != 0x100000)
 275                                 goto done;
 276                 }
 277                 saa7134_buffer_finish(dev,&dev->ts_q,VIDEOBUF_DONE);
 278         }
 279         saa7134_buffer_next(dev,&dev->ts_q);
 280
 281  done:
 282         spin_unlock(&dev->slock);
 283 }
 284
 285 /* ----------------------------------------------------------- */
 286 /*
 287  * Local variables:
 288  * c-basic-offset: 8
 289  * End:
 290  */