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  = 0;
  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         return 0;
  70 }
  71
  72 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
  73                           enum v4l2_field field)
  74 {
  75         struct saa7134_dev *dev = q->priv_data;
  76         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
  77         unsigned int lines, llength, size;
  78         u32 control;
  79         int err;
  80
  81         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
  82
  83         llength = TS_PACKET_SIZE;
  84         lines = dev->ts.nr_packets;
  85
  86         size = lines * llength;
  87         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
  88                 return -EINVAL;
  89
  90         if (buf->vb.size != size) {
  91                 saa7134_dma_free(q,buf);
  92         }
  93
  94         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
  95                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
  96
  97                 buf->vb.width  = llength;
  98                 buf->vb.height = lines;
  99                 buf->vb.size   = size;
 100                 buf->pt        = &dev->ts.pt_ts;
 101
 102                 err = videobuf_iolock(q,&buf->vb,NULL);
 103                 if (err)
 104                         goto oops;
 105                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 106                                             dma->sglist,
 107                                             dma->sglen,
 108                                             saa7134_buffer_startpage(buf));
 109                 if (err)
 110                         goto oops;
 111         }
 112
 113         /* dma: setup channel 5 (= TS) */
 114         control = SAA7134_RS_CONTROL_BURST_16 |
 115                   SAA7134_RS_CONTROL_ME |
 116                   (buf->pt->dma >> 12);
 117
 118         saa_writeb(SAA7134_TS_DMA0, ((lines-1)&0xff));
 119         saa_writeb(SAA7134_TS_DMA1, (((lines-1)>>8)&0xff));
 120         saa_writeb(SAA7134_TS_DMA2, ((((lines-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 121         saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
 122         saa_writel(SAA7134_RS_CONTROL(5),control);
 123
 124         buf->vb.state = VIDEOBUF_PREPARED;
 125         buf->activate = buffer_activate;
 126         buf->vb.field = field;
 127         return 0;
 128
 129  oops:
 130         saa7134_dma_free(q,buf);
 131         return err;
 132 }
 133
 134 static int
 135 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 136 {
 137         struct saa7134_dev *dev = q->priv_data;
 138
 139         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 140         if (0 == *count)
 141                 *count = dev->ts.nr_bufs;
 142         *count = saa7134_buffer_count(*size,*count);
 143         return 0;
 144 }
 145
 146 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 147 {
 148         struct saa7134_dev *dev = q->priv_data;
 149         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 150
 151         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 152 }
 153
 154 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 155 {
 156         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 157
 158         saa7134_dma_free(q,buf);
 159 }
 160
 161 struct videobuf_queue_ops saa7134_ts_qops = {
 162         .buf_setup    = buffer_setup,
 163         .buf_prepare  = buffer_prepare,
 164         .buf_queue    = buffer_queue,
 165         .buf_release  = buffer_release,
 166 };
 167 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 168
 169 /* ----------------------------------------------------------- */
 170 /* exported stuff                                              */
 171
 172 static unsigned int tsbufs = 8;
 173 module_param(tsbufs, int, 0444);
 174 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
 175
 176 static unsigned int ts_nr_packets = 64;
 177 module_param(ts_nr_packets, int, 0444);
 178 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 179
 180 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 181 {
 182         /* deactivate TS softreset */
 183         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 184         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 185         saa_writeb(SAA7134_TS_PARALLEL, 0xec);
 186         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 187         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 188         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 189         /* TSNOPIT=0, TSCOLAP=0 */
 190         saa_writeb(SAA7134_TS_DMA2,
 191                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 192
 193         return 0;
 194 }
 195
 196 int saa7134_ts_init1(struct saa7134_dev *dev)
 197 {
 198         /* sanitycheck insmod options */
 199         if (tsbufs < 2)
 200                 tsbufs = 2;
 201         if (tsbufs > VIDEO_MAX_FRAME)
 202                 tsbufs = VIDEO_MAX_FRAME;
 203         if (ts_nr_packets < 4)
 204                 ts_nr_packets = 4;
 205         if (ts_nr_packets > 312)
 206                 ts_nr_packets = 312;
 207         dev->ts.nr_bufs    = tsbufs;
 208         dev->ts.nr_packets = ts_nr_packets;
 209
 210         INIT_LIST_HEAD(&dev->ts_q.queue);
 211         init_timer(&dev->ts_q.timeout);
 212         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 213         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 214         dev->ts_q.dev              = dev;
 215         dev->ts_q.need_two         = 1;
 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 int saa7134_ts_fini(struct saa7134_dev *dev)
 225 {
 226         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 227         return 0;
 228 }
 229
 230
 231 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 232 {
 233         enum v4l2_field field;
 234
 235         spin_lock(&dev->slock);
 236         if (dev->ts_q.curr) {
 237                 field = dev->ts_q.curr->vb.field;
 238                 if (field == V4L2_FIELD_TOP) {
 239                         if ((status & 0x100000) != 0x000000)
 240                                 goto done;
 241                 } else {
 242                         if ((status & 0x100000) != 0x100000)
 243                                 goto done;
 244                 }
 245                 saa7134_buffer_finish(dev,&dev->ts_q,VIDEOBUF_DONE);
 246         }
 247         saa7134_buffer_next(dev,&dev->ts_q);
 248
 249  done:
 250         spin_unlock(&dev->slock);
 251 }
 252
 253 /* ----------------------------------------------------------- */
 254 /*
 255  * Local variables:
 256  * c-basic-offset: 8
 257  * End:
 258  */