drivers/media/video/saa7134/saa7134-ts.c

   1 /*
   2  * $Id: saa7134-ts.c,v 1.14 2005/02/03 10:24:33 kraxel Exp $
   3  *
   4  * device driver for philips saa7134 based TV cards
   5  * video4linux video interface
   6  *
   7  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License as published by
  11  *  the Free Software Foundation; either version 2 of the License, or
  12  *  (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31
  32 #include "saa7134-reg.h"
  33 #include "saa7134.h"
  34
  35 /* ------------------------------------------------------------------ */
  36
  37 static unsigned int ts_debug  = 0;
  38 module_param(ts_debug, int, 0644);
  39 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
  40
  41 #define dprintk(fmt, arg...)    if (ts_debug) \
  42         printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)
  43
  44 /* ------------------------------------------------------------------ */
  45
  46 static int buffer_activate(struct saa7134_dev *dev,
  47                            struct saa7134_buf *buf,
  48                            struct saa7134_buf *next)
  49 {
  50         u32 control;
  51
  52         dprintk("buffer_activate [%p]",buf);
  53         buf->vb.state = STATE_ACTIVE;
  54         buf->top_seen = 0;
  55
  56         /* dma: setup channel 5 (= TS) */
  57         control = SAA7134_RS_CONTROL_BURST_16 |
  58                 SAA7134_RS_CONTROL_ME |
  59                 (buf->pt->dma >> 12);
  60
  61         if (NULL == next)
  62                 next = buf;
  63         if (V4L2_FIELD_TOP == buf->vb.field) {
  64                 dprintk("- [top]     buf=%p next=%p\n",buf,next);
  65                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
  66                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
  67         } else {
  68                 dprintk("- [bottom]  buf=%p next=%p\n",buf,next);
  69                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
  70                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
  71         }
  72         saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
  73         saa_writel(SAA7134_RS_CONTROL(5),control);
  74
  75         /* start DMA */
  76         saa7134_set_dmabits(dev);
  77
  78         mod_timer(&dev->ts_q.timeout, jiffies+BUFFER_TIMEOUT);
  79         return 0;
  80 }
  81
  82 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  83                           enum v4l2_field field)
  84 {
  85         struct saa7134_dev *dev = q->priv_data;
  86         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  87         unsigned int lines, llength, size;
  88         int err;
  89
  90         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
  91
  92         llength = TS_PACKET_SIZE;
  93         lines = dev->ts.nr_packets;
  94
  95         size = lines * llength;
  96         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  97                 return -EINVAL;
  98
  99         if (buf->vb.size != size) {
 100                 saa7134_dma_free(dev,buf);
 101         }
 102
 103         if (STATE_NEEDS_INIT == buf->vb.state) {
 104                 buf->vb.width  = llength;
 105                 buf->vb.height = lines;
 106                 buf->vb.size   = size;
 107                 buf->pt        = &dev->ts.pt_ts;
 108
 109                 err = videobuf_iolock(dev->pci,&buf->vb,NULL);
 110                 if (err)
 111                         goto oops;
 112                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 113                                             buf->vb.dma.sglist,
 114                                             buf->vb.dma.sglen,
 115                                             saa7134_buffer_startpage(buf));
 116                 if (err)
 117                         goto oops;
 118         }
 119         buf->vb.state = STATE_PREPARED;
 120         buf->activate = buffer_activate;
 121         buf->vb.field = field;
 122         return 0;
 123
 124  oops:
 125         saa7134_dma_free(dev,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         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_dev *dev = q->priv_data;
 152         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 153
 154         saa7134_dma_free(dev,buf);
 155 }
 156
 157 struct videobuf_queue_ops saa7134_ts_qops = {
 158         .buf_setup    = buffer_setup,
 159         .buf_prepare  = buffer_prepare,
 160         .buf_queue    = buffer_queue,
 161         .buf_release  = buffer_release,
 162 };
 163 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 164
 165 /* ----------------------------------------------------------- */
 166 /* exported stuff                                              */
 167
 168 static unsigned int tsbufs = 4;
 169 module_param(tsbufs, int, 0444);
 170 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
 171
 172 static unsigned int ts_nr_packets = 30;
 173 module_param(ts_nr_packets, int, 0444);
 174 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 175
 176 int saa7134_ts_init1(struct saa7134_dev *dev)
 177 {
 178         /* sanitycheck insmod options */
 179         if (tsbufs < 2)
 180                 tsbufs = 2;
 181         if (tsbufs > VIDEO_MAX_FRAME)
 182                 tsbufs = VIDEO_MAX_FRAME;
 183         if (ts_nr_packets < 4)
 184                 ts_nr_packets = 4;
 185         if (ts_nr_packets > 312)
 186                 ts_nr_packets = 312;
 187         dev->ts.nr_bufs    = tsbufs;
 188         dev->ts.nr_packets = ts_nr_packets;
 189
 190         INIT_LIST_HEAD(&dev->ts_q.queue);
 191         init_timer(&dev->ts_q.timeout);
 192         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 193         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 194         dev->ts_q.dev              = dev;
 195         dev->ts_q.need_two         = 1;
 196         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 197
 198         /* init TS hw */
 199         saa_writeb(SAA7134_TS_SERIAL1, 0x00);  /* deactivate TS softreset */
 200         saa_writeb(SAA7134_TS_PARALLEL, 0xec); /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 201         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 202         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 203         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 204         saa_writeb(SAA7134_TS_DMA2, ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 205
 206         return 0;
 207 }
 208
 209 int saa7134_ts_fini(struct saa7134_dev *dev)
 210 {
 211         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 212         return 0;
 213 }
 214
 215
 216 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 217 {
 218         enum v4l2_field field;
 219
 220         spin_lock(&dev->slock);
 221         if (dev->ts_q.curr) {
 222                 field = dev->ts_q.curr->vb.field;
 223                 if (field == V4L2_FIELD_TOP) {
 224                         if ((status & 0x100000) != 0x000000)
 225                                 goto done;
 226                 } else {
 227                         if ((status & 0x100000) != 0x100000)
 228                                 goto done;
 229                 }
 230                 saa7134_buffer_finish(dev,&dev->ts_q,STATE_DONE);
 231         }
 232         saa7134_buffer_next(dev,&dev->ts_q);
 233
 234  done:
 235         spin_unlock(&dev->slock);
 236 }
 237
 238 /* ----------------------------------------------------------- */
 239 /*
 240  * Local variables:
 241  * c-basic-offset: 8
 242  * End:
 243  */