drivers/media/pci/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 <[email protected]> [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/delay.h>
  28
  29 #include "saa7134-reg.h"
  30 #include "saa7134.h"
  31
  32 /* ------------------------------------------------------------------ */
  33
  34 static unsigned int ts_debug;
  35 module_param(ts_debug, int, 0644);
  36 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
  37
  38 #define dprintk(fmt, arg...)    if (ts_debug) \
  39         printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)
  40
  41 /* ------------------------------------------------------------------ */
  42 static int buffer_activate(struct saa7134_dev *dev,
  43                            struct saa7134_buf *buf,
  44                            struct saa7134_buf *next)
  45 {
  46
  47         dprintk("buffer_activate [%p]",buf);
  48         buf->top_seen = 0;
  49
  50         if (!dev->ts_started)
  51                 dev->ts_field = V4L2_FIELD_TOP;
  52
  53         if (NULL == next)
  54                 next = buf;
  55         if (V4L2_FIELD_TOP == dev->ts_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                 dev->ts_field = V4L2_FIELD_BOTTOM;
  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                 dev->ts_field = V4L2_FIELD_TOP;
  65         }
  66
  67         /* start DMA */
  68         saa7134_set_dmabits(dev);
  69
  70         mod_timer(&dev->ts_q.timeout, jiffies+TS_BUFFER_TIMEOUT);
  71
  72         if (!dev->ts_started)
  73                 saa7134_ts_start(dev);
  74
  75         return 0;
  76 }
  77
  78 int saa7134_ts_buffer_init(struct vb2_buffer *vb2)
  79 {
  80         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
  81         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
  82
  83         dmaq->curr = NULL;
  84         buf->activate = buffer_activate;
  85
  86         return 0;
  87 }
  88 EXPORT_SYMBOL_GPL(saa7134_ts_buffer_init);
  89
  90 int saa7134_ts_buffer_prepare(struct vb2_buffer *vb2)
  91 {
  92         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
  93         struct saa7134_dev *dev = dmaq->dev;
  94         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
  95         struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
  96         unsigned int lines, llength, size;
  97         int ret;
  98
  99         dprintk("buffer_prepare [%p]\n", buf);
 100
 101         llength = TS_PACKET_SIZE;
 102         lines = dev->ts.nr_packets;
 103
 104         size = lines * llength;
 105         if (vb2_plane_size(vb2, 0) < size)
 106                 return -EINVAL;
 107
 108         vb2_set_plane_payload(vb2, 0, size);
 109         vb2->v4l2_buf.field = dev->field;
 110
 111         ret = dma_map_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE);
 112         if (!ret)
 113                 return -EIO;
 114         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 115                                     saa7134_buffer_startpage(buf));
 116 }
 117 EXPORT_SYMBOL_GPL(saa7134_ts_buffer_prepare);
 118
 119 void saa7134_ts_buffer_finish(struct vb2_buffer *vb2)
 120 {
 121         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 122         struct saa7134_dev *dev = dmaq->dev;
 123         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
 124         struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
 125
 126         dma_unmap_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE);
 127 }
 128 EXPORT_SYMBOL_GPL(saa7134_ts_buffer_finish);
 129
 130 int saa7134_ts_queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
 131                            unsigned int *nbuffers, unsigned int *nplanes,
 132                            unsigned int sizes[], void *alloc_ctxs[])
 133 {
 134         struct saa7134_dmaqueue *dmaq = q->drv_priv;
 135         struct saa7134_dev *dev = dmaq->dev;
 136         int size = TS_PACKET_SIZE * dev->ts.nr_packets;
 137
 138         if (0 == *nbuffers)
 139                 *nbuffers = dev->ts.nr_bufs;
 140         *nbuffers = saa7134_buffer_count(size, *nbuffers);
 141         if (*nbuffers < 3)
 142                 *nbuffers = 3;
 143         *nplanes = 1;
 144         sizes[0] = size;
 145         return 0;
 146 }
 147 EXPORT_SYMBOL_GPL(saa7134_ts_queue_setup);
 148
 149 int saa7134_ts_start_streaming(struct vb2_queue *vq, unsigned int count)
 150 {
 151         struct saa7134_dmaqueue *dmaq = vq->drv_priv;
 152         struct saa7134_dev *dev = dmaq->dev;
 153
 154         /*
 155          * Planar video capture and TS share the same DMA channel,
 156          * so only one can be active at a time.
 157          */
 158         if (vb2_is_busy(&dev->video_vbq) && dev->fmt->planar) {
 159                 struct saa7134_buf *buf, *tmp;
 160
 161                 list_for_each_entry_safe(buf, tmp, &dmaq->queue, entry) {
 162                         list_del(&buf->entry);
 163                         vb2_buffer_done(&buf->vb2, VB2_BUF_STATE_QUEUED);
 164                 }
 165                 if (dmaq->curr) {
 166                         vb2_buffer_done(&dmaq->curr->vb2, VB2_BUF_STATE_QUEUED);
 167                         dmaq->curr = NULL;
 168                 }
 169                 return -EBUSY;
 170         }
 171         dmaq->seq_nr = 0;
 172         return 0;
 173 }
 174 EXPORT_SYMBOL_GPL(saa7134_ts_start_streaming);
 175
 176 void saa7134_ts_stop_streaming(struct vb2_queue *vq)
 177 {
 178         struct saa7134_dmaqueue *dmaq = vq->drv_priv;
 179         struct saa7134_dev *dev = dmaq->dev;
 180
 181         saa7134_ts_stop(dev);
 182         saa7134_stop_streaming(dev, dmaq);
 183 }
 184 EXPORT_SYMBOL_GPL(saa7134_ts_stop_streaming);
 185
 186 struct vb2_ops saa7134_ts_qops = {
 187         .queue_setup    = saa7134_ts_queue_setup,
 188         .buf_init       = saa7134_ts_buffer_init,
 189         .buf_prepare    = saa7134_ts_buffer_prepare,
 190         .buf_finish     = saa7134_ts_buffer_finish,
 191         .buf_queue      = saa7134_vb2_buffer_queue,
 192         .wait_prepare   = vb2_ops_wait_prepare,
 193         .wait_finish    = vb2_ops_wait_finish,
 194         .stop_streaming = saa7134_ts_stop_streaming,
 195 };
 196 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 197
 198 /* ----------------------------------------------------------- */
 199 /* exported stuff                                              */
 200
 201 static unsigned int tsbufs = 8;
 202 module_param(tsbufs, int, 0444);
 203 MODULE_PARM_DESC(tsbufs, "number of ts buffers for read/write IO, range 2-32");
 204
 205 static unsigned int ts_nr_packets = 64;
 206 module_param(ts_nr_packets, int, 0444);
 207 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 208
 209 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 210 {
 211         /* deactivate TS softreset */
 212         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 213         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 214         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 215         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 216         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 217         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 218         /* TSNOPIT=0, TSCOLAP=0 */
 219         saa_writeb(SAA7134_TS_DMA2,
 220                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 221
 222         return 0;
 223 }
 224
 225 int saa7134_ts_init1(struct saa7134_dev *dev)
 226 {
 227         /* sanitycheck insmod options */
 228         if (tsbufs < 2)
 229                 tsbufs = 2;
 230         if (tsbufs > VIDEO_MAX_FRAME)
 231                 tsbufs = VIDEO_MAX_FRAME;
 232         if (ts_nr_packets < 4)
 233                 ts_nr_packets = 4;
 234         if (ts_nr_packets > 312)
 235                 ts_nr_packets = 312;
 236         dev->ts.nr_bufs    = tsbufs;
 237         dev->ts.nr_packets = ts_nr_packets;
 238
 239         INIT_LIST_HEAD(&dev->ts_q.queue);
 240         init_timer(&dev->ts_q.timeout);
 241         dev->ts_q.timeout.function = saa7134_buffer_timeout;
 242         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
 243         dev->ts_q.dev              = dev;
 244         dev->ts_q.need_two         = 1;
 245         dev->ts_started            = 0;
 246         saa7134_pgtable_alloc(dev->pci, &dev->ts_q.pt);
 247
 248         /* init TS hw */
 249         saa7134_ts_init_hw(dev);
 250
 251         return 0;
 252 }
 253
 254 /* Function for stop TS */
 255 int saa7134_ts_stop(struct saa7134_dev *dev)
 256 {
 257         dprintk("TS stop\n");
 258
 259         if (!dev->ts_started)
 260                 return 0;
 261
 262         /* Stop TS stream */
 263         switch (saa7134_boards[dev->board].ts_type) {
 264         case SAA7134_MPEG_TS_PARALLEL:
 265                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 266                 dev->ts_started = 0;
 267                 break;
 268         case SAA7134_MPEG_TS_SERIAL:
 269                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 270                 dev->ts_started = 0;
 271                 break;
 272         }
 273         return 0;
 274 }
 275
 276 /* Function for start TS */
 277 int saa7134_ts_start(struct saa7134_dev *dev)
 278 {
 279         dprintk("TS start\n");
 280
 281         if (WARN_ON(dev->ts_started))
 282                 return 0;
 283
 284         /* dma: setup channel 5 (= TS) */
 285         saa_writeb(SAA7134_TS_DMA0, (dev->ts.nr_packets - 1) & 0xff);
 286         saa_writeb(SAA7134_TS_DMA1,
 287                 ((dev->ts.nr_packets - 1) >> 8) & 0xff);
 288         /* TSNOPIT=0, TSCOLAP=0 */
 289         saa_writeb(SAA7134_TS_DMA2,
 290                 (((dev->ts.nr_packets - 1) >> 16) & 0x3f) | 0x00);
 291         saa_writel(SAA7134_RS_PITCH(5), TS_PACKET_SIZE);
 292         saa_writel(SAA7134_RS_CONTROL(5), SAA7134_RS_CONTROL_BURST_16 |
 293                                           SAA7134_RS_CONTROL_ME |
 294                                           (dev->ts_q.pt.dma >> 12));
 295
 296         /* reset hardware TS buffers */
 297         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 298         saa_writeb(SAA7134_TS_SERIAL1, 0x03);
 299         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 300         saa_writeb(SAA7134_TS_SERIAL1, 0x01);
 301
 302         /* TS clock non-inverted */
 303         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 304
 305         /* Start TS stream */
 306         switch (saa7134_boards[dev->board].ts_type) {
 307         case SAA7134_MPEG_TS_PARALLEL:
 308                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 309                 saa_writeb(SAA7134_TS_PARALLEL, 0xec |
 310                         (saa7134_boards[dev->board].ts_force_val << 4));
 311                 break;
 312         case SAA7134_MPEG_TS_SERIAL:
 313                 saa_writeb(SAA7134_TS_SERIAL0, 0xd8);
 314                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c |
 315                         (saa7134_boards[dev->board].ts_force_val << 4));
 316                 saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 0xbc);
 317                 saa_writeb(SAA7134_TS_SERIAL1, 0x02);
 318                 break;
 319         }
 320
 321         dev->ts_started = 1;
 322
 323         return 0;
 324 }
 325
 326 int saa7134_ts_fini(struct saa7134_dev *dev)
 327 {
 328         saa7134_pgtable_free(dev->pci, &dev->ts_q.pt);
 329         return 0;
 330 }
 331
 332 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 333 {
 334         enum v4l2_field field;
 335
 336         spin_lock(&dev->slock);
 337         if (dev->ts_q.curr) {
 338                 field = dev->ts_field;
 339                 if (field != V4L2_FIELD_TOP) {
 340                         if ((status & 0x100000) != 0x000000)
 341                                 goto done;
 342                 } else {
 343                         if ((status & 0x100000) != 0x100000)
 344                                 goto done;
 345                 }
 346                 saa7134_buffer_finish(dev, &dev->ts_q, VB2_BUF_STATE_DONE);
 347         }
 348         saa7134_buffer_next(dev,&dev->ts_q);
 349
 350  done:
 351         spin_unlock(&dev->slock);
 352 }