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
  50         dprintk("buffer_activate [%p]",buf);
  51         buf->vb.state = STATE_ACTIVE;
  52         buf->top_seen = 0;
  53
  54         if (NULL == next)
  55                 next = buf;
  56         if (V4L2_FIELD_TOP == buf->vb.field) {
  57                 dprintk("- [top]     buf=%p next=%p\n",buf,next);
  58                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
  59                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
  60         } else {
  61                 dprintk("- [bottom]  buf=%p next=%p\n",buf,next);
  62                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
  63                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
  64         }
  65
  66         /* start DMA */
  67         saa7134_set_dmabits(dev);
  68
  69         mod_timer(&dev->ts_q.timeout, jiffies+BUFFER_TIMEOUT);
  70         return 0;
  71 }
  72
  73 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  74                           enum v4l2_field field)
  75 {
  76         struct saa7134_dev *dev = q->priv_data;
  77         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  78         unsigned int lines, llength, size;
  79         u32 control;
  80         int err;
  81
  82         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
  83
  84         llength = TS_PACKET_SIZE;
  85         lines = dev->ts.nr_packets;
  86
  87         size = lines * llength;
  88         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  89                 return -EINVAL;
  90
  91         if (buf->vb.size != size) {
  92                 saa7134_dma_free(q,buf);
  93         }
  94
  95         if (STATE_NEEDS_INIT == buf->vb.state) {
  96                 buf->vb.width  = llength;
  97                 buf->vb.height = lines;
  98                 buf->vb.size   = size;
  99                 buf->pt        = &dev->ts.pt_ts;
 100
 101                 err = videobuf_iolock(q,&buf->vb,NULL);
 102                 if (err)
 103                         goto oops;
 104                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 105                                             buf->vb.dma.sglist,
 106                                             buf->vb.dma.sglen,
 107                                             saa7134_buffer_startpage(buf));
 108                 if (err)
 109                         goto oops;
 110         }
 111
 112         /* dma: setup channel 5 (= TS) */
 113         control = SAA7134_RS_CONTROL_BURST_16 |
 114                   SAA7134_RS_CONTROL_ME |
 115                   (buf->pt->dma >> 12);
 116
 117         saa_writeb(SAA7134_TS_DMA0, ((lines-1)&0xff));
 118         saa_writeb(SAA7134_TS_DMA1, (((lines-1)>>8)&0xff));
 119         saa_writeb(SAA7134_TS_DMA2, ((((lines-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 120         saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
 121         saa_writel(SAA7134_RS_CONTROL(5),control);
 122
 123         buf->vb.state = STATE_PREPARED;
 124         buf->activate = buffer_activate;
 125         buf->vb.field = field;
 126         return 0;
 127
 128  oops:
 129         saa7134_dma_free(q,buf);
 130         return err;
 131 }
 132
 133 static int
 134 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 135 {
 136         struct saa7134_dev *dev = q->priv_data;
 137
 138         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 139         if (0 == *count)
 140                 *count = dev->ts.nr_bufs;
 141         *count = saa7134_buffer_count(*size,*count);
 142         return 0;
 143 }
 144
 145 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 146 {
 147         struct saa7134_dev *dev = q->priv_data;
 148         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 149
 150         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 151 }
 152
 153 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 154 {
 155         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 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, 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_init1(struct saa7134_dev *dev)
 180 {
 181         /* sanitycheck insmod options */
 182         if (tsbufs < 2)
 183                 tsbufs = 2;
 184         if (tsbufs > VIDEO_MAX_FRAME)
 185                 tsbufs = VIDEO_MAX_FRAME;
 186         if (ts_nr_packets < 4)
 187                 ts_nr_packets = 4;
 188         if (ts_nr_packets > 312)
 189                 ts_nr_packets = 312;
 190         dev->ts.nr_bufs    = tsbufs;
 191         dev->ts.nr_packets = ts_nr_packets;
 192
 193         INIT_LIST_HEAD(&dev->ts_q.queue);
 194         init_timer(&dev->ts_q.timeout);
 195         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 196         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 197         dev->ts_q.dev              = dev;
 198         dev->ts_q.need_two         = 1;
 199         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 200
 201         /* init TS hw */
 202         saa_writeb(SAA7134_TS_SERIAL1, 0x00);  /* deactivate TS softreset */
 203         saa_writeb(SAA7134_TS_PARALLEL, 0xec); /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 204         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 205         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 206         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 207         saa_writeb(SAA7134_TS_DMA2, ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 208
 209         return 0;
 210 }
 211
 212 int saa7134_ts_fini(struct saa7134_dev *dev)
 213 {
 214         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 215         return 0;
 216 }
 217
 218
 219 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 220 {
 221         enum v4l2_field field;
 222
 223         spin_lock(&dev->slock);
 224         if (dev->ts_q.curr) {
 225                 field = dev->ts_q.curr->vb.field;
 226                 if (field == V4L2_FIELD_TOP) {
 227                         if ((status & 0x100000) != 0x000000)
 228                                 goto done;
 229                 } else {
 230                         if ((status & 0x100000) != 0x100000)
 231                                 goto done;
 232                 }
 233                 saa7134_buffer_finish(dev,&dev->ts_q,STATE_DONE);
 234         }
 235         saa7134_buffer_next(dev,&dev->ts_q);
 236
 237  done:
 238         spin_unlock(&dev->slock);
 239 }
 240
 241 /* ----------------------------------------------------------- */
 242 /*
 243  * Local variables:
 244  * c-basic-offset: 8
 245  * End:
 246  */