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/moduleparam.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/delay.h>
  30
  31 #include "saa7134-reg.h"
  32 #include "saa7134.h"
  33
  34 /* ------------------------------------------------------------------ */
  35
  36 static unsigned int ts_debug  = 0;
  37 module_param(ts_debug, int, 0644);
  38 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
  39
  40 #define dprintk(fmt, arg...)    if (ts_debug) \
  41         printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)
  42
  43 /* ------------------------------------------------------------------ */
  44
  45 static int buffer_activate(struct saa7134_dev *dev,
  46                            struct saa7134_buf *buf,
  47                            struct saa7134_buf *next)
  48 {
  49         u32 control;
  50
  51         dprintk("buffer_activate [%p]",buf);
  52         buf->vb.state = STATE_ACTIVE;
  53         buf->top_seen = 0;
  54
  55         /* dma: setup channel 5 (= TS) */
  56         control = SAA7134_RS_CONTROL_BURST_16 |
  57                 SAA7134_RS_CONTROL_ME |
  58                 (buf->pt->dma >> 12);
  59
  60         if (NULL == next)
  61                 next = buf;
  62         if (V4L2_FIELD_TOP == buf->vb.field) {
  63                 dprintk("- [top]     buf=%p next=%p\n",buf,next);
  64                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
  65                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
  66         } else {
  67                 dprintk("- [bottom]  buf=%p next=%p\n",buf,next);
  68                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
  69                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
  70         }
  71         saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
  72         saa_writel(SAA7134_RS_CONTROL(5),control);
  73
  74         /* start DMA */
  75         saa7134_set_dmabits(dev);
  76
  77         mod_timer(&dev->ts_q.timeout, jiffies+BUFFER_TIMEOUT);
  78         return 0;
  79 }
  80
  81 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  82                           enum v4l2_field field)
  83 {
  84         struct saa7134_dev *dev = q->priv_data;
  85         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  86         unsigned int lines, llength, size;
  87         int err;
  88
  89         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
  90
  91         llength = TS_PACKET_SIZE;
  92         lines = dev->ts.nr_packets;
  93
  94         size = lines * llength;
  95         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  96                 return -EINVAL;
  97
  98         if (buf->vb.size != size) {
  99                 saa7134_dma_free(dev,buf);
 100         }
 101
 102         if (STATE_NEEDS_INIT == buf->vb.state) {
 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(dev->pci,&buf->vb,NULL);
 109                 if (err)
 110                         goto oops;
 111                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 112                                             buf->vb.dma.sglist,
 113                                             buf->vb.dma.sglen,
 114                                             saa7134_buffer_startpage(buf));
 115                 if (err)
 116                         goto oops;
 117         }
 118         buf->vb.state = STATE_PREPARED;
 119         buf->activate = buffer_activate;
 120         buf->vb.field = field;
 121         return 0;
 122
 123  oops:
 124         saa7134_dma_free(dev,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         return 0;
 138 }
 139
 140 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 141 {
 142         struct saa7134_dev *dev = q->priv_data;
 143         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 144
 145         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 146 }
 147
 148 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 149 {
 150         struct saa7134_dev *dev = q->priv_data;
 151         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 152
 153         saa7134_dma_free(dev,buf);
 154 }
 155
 156 struct videobuf_queue_ops saa7134_ts_qops = {
 157         .buf_setup    = buffer_setup,
 158         .buf_prepare  = buffer_prepare,
 159         .buf_queue    = buffer_queue,
 160         .buf_release  = buffer_release,
 161 };
 162 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 163
 164 /* ----------------------------------------------------------- */
 165 /* exported stuff                                              */
 166
 167 static unsigned int tsbufs = 4;
 168 module_param(tsbufs, int, 0444);
 169 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
 170
 171 static unsigned int ts_nr_packets = 30;
 172 module_param(ts_nr_packets, int, 0444);
 173 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 174
 175 int saa7134_ts_init1(struct saa7134_dev *dev)
 176 {
 177         /* sanitycheck insmod options */
 178         if (tsbufs < 2)
 179                 tsbufs = 2;
 180         if (tsbufs > VIDEO_MAX_FRAME)
 181                 tsbufs = VIDEO_MAX_FRAME;
 182         if (ts_nr_packets < 4)
 183                 ts_nr_packets = 4;
 184         if (ts_nr_packets > 312)
 185                 ts_nr_packets = 312;
 186         dev->ts.nr_bufs    = tsbufs;
 187         dev->ts.nr_packets = ts_nr_packets;
 188
 189         INIT_LIST_HEAD(&dev->ts_q.queue);
 190         init_timer(&dev->ts_q.timeout);
 191         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 192         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 193         dev->ts_q.dev              = dev;
 194         dev->ts_q.need_two         = 1;
 195         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 196
 197         /* init TS hw */
 198         saa_writeb(SAA7134_TS_SERIAL1, 0x00);  /* deactivate TS softreset */
 199         saa_writeb(SAA7134_TS_PARALLEL, 0xec); /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 200         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 201         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 202         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 203         saa_writeb(SAA7134_TS_DMA2, ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 204
 205         return 0;
 206 }
 207
 208 int saa7134_ts_fini(struct saa7134_dev *dev)
 209 {
 210         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 211         return 0;
 212 }
 213
 214
 215 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 216 {
 217         enum v4l2_field field;
 218
 219         spin_lock(&dev->slock);
 220         if (dev->ts_q.curr) {
 221                 field = dev->ts_q.curr->vb.field;
 222                 if (field == V4L2_FIELD_TOP) {
 223                         if ((status & 0x100000) != 0x100000)
 224                                 goto done;
 225                 } else {
 226                         if ((status & 0x100000) != 0x000000)
 227                                 goto done;
 228                 }
 229                 saa7134_buffer_finish(dev,&dev->ts_q,STATE_DONE);
 230         }
 231         saa7134_buffer_next(dev,&dev->ts_q);
 232
 233  done:
 234         spin_unlock(&dev->slock);
 235 }
 236
 237 /* ----------------------------------------------------------- */
 238 /*
 239  * Local variables:
 240  * c-basic-offset: 8
 241  * End:
 242  */