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 = STATE_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 (STATE_NEEDS_INIT == buf->vb.state) {
  95                 buf->vb.width  = llength;
  96                 buf->vb.height = lines;
  97                 buf->vb.size   = size;
  98                 buf->pt        = &dev->ts.pt_ts;
  99
 100                 err = videobuf_iolock(q,&buf->vb,NULL);
 101                 if (err)
 102                         goto oops;
 103                 err = saa7134_pgtable_build(dev->pci,buf->pt,
 104                                             buf->vb.dma.sglist,
 105                                             buf->vb.dma.sglen,
 106                                             saa7134_buffer_startpage(buf));
 107                 if (err)
 108                         goto oops;
 109         }
 110
 111         /* dma: setup channel 5 (= TS) */
 112         control = SAA7134_RS_CONTROL_BURST_16 |
 113                   SAA7134_RS_CONTROL_ME |
 114                   (buf->pt->dma >> 12);
 115
 116         saa_writeb(SAA7134_TS_DMA0, ((lines-1)&0xff));
 117         saa_writeb(SAA7134_TS_DMA1, (((lines-1)>>8)&0xff));
 118         saa_writeb(SAA7134_TS_DMA2, ((((lines-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 119         saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
 120         saa_writel(SAA7134_RS_CONTROL(5),control);
 121
 122         buf->vb.state = STATE_PREPARED;
 123         buf->activate = buffer_activate;
 124         buf->vb.field = field;
 125         return 0;
 126
 127  oops:
 128         saa7134_dma_free(q,buf);
 129         return err;
 130 }
 131
 132 static int
 133 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 134 {
 135         struct saa7134_dev *dev = q->priv_data;
 136
 137         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
 138         if (0 == *count)
 139                 *count = dev->ts.nr_bufs;
 140         *count = saa7134_buffer_count(*size,*count);
 141         return 0;
 142 }
 143
 144 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
 145 {
 146         struct saa7134_dev *dev = q->priv_data;
 147         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 148
 149         saa7134_buffer_queue(dev,&dev->ts_q,buf);
 150 }
 151
 152 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 153 {
 154         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
 155
 156         saa7134_dma_free(q,buf);
 157 }
 158
 159 struct videobuf_queue_ops saa7134_ts_qops = {
 160         .buf_setup    = buffer_setup,
 161         .buf_prepare  = buffer_prepare,
 162         .buf_queue    = buffer_queue,
 163         .buf_release  = buffer_release,
 164 };
 165 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 166
 167 /* ----------------------------------------------------------- */
 168 /* exported stuff                                              */
 169
 170 static unsigned int tsbufs = 8;
 171 module_param(tsbufs, int, 0444);
 172 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
 173
 174 static unsigned int ts_nr_packets = 64;
 175 module_param(ts_nr_packets, int, 0444);
 176 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 177
 178 int saa7134_ts_init1(struct saa7134_dev *dev)
 179 {
 180         /* sanitycheck insmod options */
 181         if (tsbufs < 2)
 182                 tsbufs = 2;
 183         if (tsbufs > VIDEO_MAX_FRAME)
 184                 tsbufs = VIDEO_MAX_FRAME;
 185         if (ts_nr_packets < 4)
 186                 ts_nr_packets = 4;
 187         if (ts_nr_packets > 312)
 188                 ts_nr_packets = 312;
 189         dev->ts.nr_bufs    = tsbufs;
 190         dev->ts.nr_packets = ts_nr_packets;
 191
 192         INIT_LIST_HEAD(&dev->ts_q.queue);
 193         init_timer(&dev->ts_q.timeout);
 194         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 195         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 196         dev->ts_q.dev              = dev;
 197         dev->ts_q.need_two         = 1;
 198         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
 199
 200         /* init TS hw */
 201         saa_writeb(SAA7134_TS_SERIAL1, 0x00);  /* deactivate TS softreset */
 202         saa_writeb(SAA7134_TS_PARALLEL, 0xec); /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 203         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 204         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 205         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 206         saa_writeb(SAA7134_TS_DMA2, ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
 207
 208         return 0;
 209 }
 210
 211 int saa7134_ts_fini(struct saa7134_dev *dev)
 212 {
 213         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
 214         return 0;
 215 }
 216
 217
 218 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 219 {
 220         enum v4l2_field field;
 221
 222         spin_lock(&dev->slock);
 223         if (dev->ts_q.curr) {
 224                 field = dev->ts_q.curr->vb.field;
 225                 if (field == V4L2_FIELD_TOP) {
 226                         if ((status & 0x100000) != 0x000000)
 227                                 goto done;
 228                 } else {
 229                         if ((status & 0x100000) != 0x100000)
 230                                 goto done;
 231                 }
 232                 saa7134_buffer_finish(dev,&dev->ts_q,STATE_DONE);
 233         }
 234         saa7134_buffer_next(dev,&dev->ts_q);
 235
 236  done:
 237         spin_unlock(&dev->slock);
 238 }
 239
 240 /* ----------------------------------------------------------- */
 241 /*
 242  * Local variables:
 243  * c-basic-offset: 8
 244  * End:
 245  */