drivers/media/pci/saa7134/saa7134-ts.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * device driver for philips saa7134 based TV cards
   5  * video4linux video interface
   6  *
   7  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   8  */
   9
  10 #include "saa7134.h"
  11 #include "saa7134-reg.h"
  12
  13 #include <linux/init.h>
  14 #include <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17 #include <linux/delay.h>
  18
  19 /* ------------------------------------------------------------------ */
  20
  21 static unsigned int ts_debug;
  22 module_param(ts_debug, int, 0644);
  23 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
  24
  25 #define ts_dbg(fmt, arg...) do { \
  26         if (ts_debug) \
  27                 printk(KERN_DEBUG pr_fmt("ts: " fmt), ## arg); \
  28         } while (0)
  29
  30 /* ------------------------------------------------------------------ */
  31 static int buffer_activate(struct saa7134_dev *dev,
  32                            struct saa7134_buf *buf,
  33                            struct saa7134_buf *next)
  34 {
  35
  36         ts_dbg("buffer_activate [%p]", buf);
  37         buf->top_seen = 0;
  38
  39         if (!dev->ts_started)
  40                 dev->ts_field = V4L2_FIELD_TOP;
  41
  42         if (NULL == next)
  43                 next = buf;
  44         if (V4L2_FIELD_TOP == dev->ts_field) {
  45                 ts_dbg("- [top]     buf=%p next=%p\n", buf, next);
  46                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
  47                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
  48                 dev->ts_field = V4L2_FIELD_BOTTOM;
  49         } else {
  50                 ts_dbg("- [bottom]  buf=%p next=%p\n", buf, next);
  51                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
  52                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
  53                 dev->ts_field = V4L2_FIELD_TOP;
  54         }
  55
  56         /* start DMA */
  57         saa7134_set_dmabits(dev);
  58
  59         mod_timer(&dev->ts_q.timeout, jiffies+TS_BUFFER_TIMEOUT);
  60
  61         if (!dev->ts_started)
  62                 saa7134_ts_start(dev);
  63
  64         return 0;
  65 }
  66
  67 int saa7134_ts_buffer_init(struct vb2_buffer *vb2)
  68 {
  69         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
  70         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
  71         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
  72
  73         dmaq->curr = NULL;
  74         buf->activate = buffer_activate;
  75
  76         return 0;
  77 }
  78 EXPORT_SYMBOL_GPL(saa7134_ts_buffer_init);
  79
  80 int saa7134_ts_buffer_prepare(struct vb2_buffer *vb2)
  81 {
  82         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
  83         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
  84         struct saa7134_dev *dev = dmaq->dev;
  85         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
  86         struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
  87         unsigned int lines, llength, size;
  88
  89         ts_dbg("buffer_prepare [%p]\n", buf);
  90
  91         llength = TS_PACKET_SIZE;
  92         lines = dev->ts.nr_packets;
  93
  94         size = lines * llength;
  95         if (vb2_plane_size(vb2, 0) < size)
  96                 return -EINVAL;
  97
  98         vb2_set_plane_payload(vb2, 0, size);
  99         vbuf->field = dev->field;
 100
 101         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 102                                     saa7134_buffer_startpage(buf));
 103 }
 104 EXPORT_SYMBOL_GPL(saa7134_ts_buffer_prepare);
 105
 106 int saa7134_ts_queue_setup(struct vb2_queue *q,
 107                            unsigned int *nbuffers, unsigned int *nplanes,
 108                            unsigned int sizes[], struct device *alloc_devs[])
 109 {
 110         struct saa7134_dmaqueue *dmaq = q->drv_priv;
 111         struct saa7134_dev *dev = dmaq->dev;
 112         int size = TS_PACKET_SIZE * dev->ts.nr_packets;
 113
 114         if (0 == *nbuffers)
 115                 *nbuffers = dev->ts.nr_bufs;
 116         *nbuffers = saa7134_buffer_count(size, *nbuffers);
 117         if (*nbuffers < 3)
 118                 *nbuffers = 3;
 119         *nplanes = 1;
 120         sizes[0] = size;
 121         return 0;
 122 }
 123 EXPORT_SYMBOL_GPL(saa7134_ts_queue_setup);
 124
 125 int saa7134_ts_start_streaming(struct vb2_queue *vq, unsigned int count)
 126 {
 127         struct saa7134_dmaqueue *dmaq = vq->drv_priv;
 128         struct saa7134_dev *dev = dmaq->dev;
 129
 130         /*
 131          * Planar video capture and TS share the same DMA channel,
 132          * so only one can be active at a time.
 133          */
 134         if (vb2_is_busy(&dev->video_vbq) && dev->fmt->planar) {
 135                 struct saa7134_buf *buf, *tmp;
 136
 137                 list_for_each_entry_safe(buf, tmp, &dmaq->queue, entry) {
 138                         list_del(&buf->entry);
 139                         vb2_buffer_done(&buf->vb2.vb2_buf,
 140                                         VB2_BUF_STATE_QUEUED);
 141                 }
 142                 if (dmaq->curr) {
 143                         vb2_buffer_done(&dmaq->curr->vb2.vb2_buf,
 144                                         VB2_BUF_STATE_QUEUED);
 145                         dmaq->curr = NULL;
 146                 }
 147                 return -EBUSY;
 148         }
 149         dmaq->seq_nr = 0;
 150         return 0;
 151 }
 152 EXPORT_SYMBOL_GPL(saa7134_ts_start_streaming);
 153
 154 void saa7134_ts_stop_streaming(struct vb2_queue *vq)
 155 {
 156         struct saa7134_dmaqueue *dmaq = vq->drv_priv;
 157         struct saa7134_dev *dev = dmaq->dev;
 158
 159         saa7134_ts_stop(dev);
 160         saa7134_stop_streaming(dev, dmaq);
 161 }
 162 EXPORT_SYMBOL_GPL(saa7134_ts_stop_streaming);
 163
 164 struct vb2_ops saa7134_ts_qops = {
 165         .queue_setup    = saa7134_ts_queue_setup,
 166         .buf_init       = saa7134_ts_buffer_init,
 167         .buf_prepare    = saa7134_ts_buffer_prepare,
 168         .buf_queue      = saa7134_vb2_buffer_queue,
 169         .wait_prepare   = vb2_ops_wait_prepare,
 170         .wait_finish    = vb2_ops_wait_finish,
 171         .stop_streaming = saa7134_ts_stop_streaming,
 172 };
 173 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
 174
 175 /* ----------------------------------------------------------- */
 176 /* exported stuff                                              */
 177
 178 static unsigned int tsbufs = 8;
 179 module_param(tsbufs, int, 0444);
 180 MODULE_PARM_DESC(tsbufs, "number of ts buffers for read/write IO, range 2-32");
 181
 182 static unsigned int ts_nr_packets = 64;
 183 module_param(ts_nr_packets, int, 0444);
 184 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
 185
 186 int saa7134_ts_init_hw(struct saa7134_dev *dev)
 187 {
 188         /* deactivate TS softreset */
 189         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 190         /* TSSOP high active, TSVAL high active, TSLOCK ignored */
 191         saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 192         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
 193         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
 194         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
 195         /* TSNOPIT=0, TSCOLAP=0 */
 196         saa_writeb(SAA7134_TS_DMA2,
 197                 ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00));
 198
 199         return 0;
 200 }
 201
 202 int saa7134_ts_init1(struct saa7134_dev *dev)
 203 {
 204         /* sanitycheck insmod options */
 205         if (tsbufs < 2)
 206                 tsbufs = 2;
 207         if (tsbufs > VIDEO_MAX_FRAME)
 208                 tsbufs = VIDEO_MAX_FRAME;
 209         if (ts_nr_packets < 4)
 210                 ts_nr_packets = 4;
 211         if (ts_nr_packets > 312)
 212                 ts_nr_packets = 312;
 213         dev->ts.nr_bufs    = tsbufs;
 214         dev->ts.nr_packets = ts_nr_packets;
 215
 216         INIT_LIST_HEAD(&dev->ts_q.queue);
 217         timer_setup(&dev->ts_q.timeout, saa7134_buffer_timeout, 0);
 218         dev->ts_q.dev              = dev;
 219         dev->ts_q.need_two         = 1;
 220         dev->ts_started            = 0;
 221         saa7134_pgtable_alloc(dev->pci, &dev->ts_q.pt);
 222
 223         /* init TS hw */
 224         saa7134_ts_init_hw(dev);
 225
 226         return 0;
 227 }
 228
 229 /* Function for stop TS */
 230 int saa7134_ts_stop(struct saa7134_dev *dev)
 231 {
 232         ts_dbg("TS stop\n");
 233
 234         if (!dev->ts_started)
 235                 return 0;
 236
 237         /* Stop TS stream */
 238         switch (saa7134_boards[dev->board].ts_type) {
 239         case SAA7134_MPEG_TS_PARALLEL:
 240                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c);
 241                 dev->ts_started = 0;
 242                 break;
 243         case SAA7134_MPEG_TS_SERIAL:
 244                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 245                 dev->ts_started = 0;
 246                 break;
 247         }
 248         return 0;
 249 }
 250
 251 /* Function for start TS */
 252 int saa7134_ts_start(struct saa7134_dev *dev)
 253 {
 254         ts_dbg("TS start\n");
 255
 256         if (WARN_ON(dev->ts_started))
 257                 return 0;
 258
 259         /* dma: setup channel 5 (= TS) */
 260         saa_writeb(SAA7134_TS_DMA0, (dev->ts.nr_packets - 1) & 0xff);
 261         saa_writeb(SAA7134_TS_DMA1,
 262                 ((dev->ts.nr_packets - 1) >> 8) & 0xff);
 263         /* TSNOPIT=0, TSCOLAP=0 */
 264         saa_writeb(SAA7134_TS_DMA2,
 265                 (((dev->ts.nr_packets - 1) >> 16) & 0x3f) | 0x00);
 266         saa_writel(SAA7134_RS_PITCH(5), TS_PACKET_SIZE);
 267         saa_writel(SAA7134_RS_CONTROL(5), SAA7134_RS_CONTROL_BURST_16 |
 268                                           SAA7134_RS_CONTROL_ME |
 269                                           (dev->ts_q.pt.dma >> 12));
 270
 271         /* reset hardware TS buffers */
 272         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 273         saa_writeb(SAA7134_TS_SERIAL1, 0x03);
 274         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 275         saa_writeb(SAA7134_TS_SERIAL1, 0x01);
 276
 277         /* TS clock non-inverted */
 278         saa_writeb(SAA7134_TS_SERIAL1, 0x00);
 279
 280         /* Start TS stream */
 281         switch (saa7134_boards[dev->board].ts_type) {
 282         case SAA7134_MPEG_TS_PARALLEL:
 283                 saa_writeb(SAA7134_TS_SERIAL0, 0x40);
 284                 saa_writeb(SAA7134_TS_PARALLEL, 0xec |
 285                         (saa7134_boards[dev->board].ts_force_val << 4));
 286                 break;
 287         case SAA7134_MPEG_TS_SERIAL:
 288                 saa_writeb(SAA7134_TS_SERIAL0, 0xd8);
 289                 saa_writeb(SAA7134_TS_PARALLEL, 0x6c |
 290                         (saa7134_boards[dev->board].ts_force_val << 4));
 291                 saa_writeb(SAA7134_TS_PARALLEL_SERIAL, 0xbc);
 292                 saa_writeb(SAA7134_TS_SERIAL1, 0x02);
 293                 break;
 294         }
 295
 296         dev->ts_started = 1;
 297
 298         return 0;
 299 }
 300
 301 int saa7134_ts_fini(struct saa7134_dev *dev)
 302 {
 303         saa7134_pgtable_free(dev->pci, &dev->ts_q.pt);
 304         return 0;
 305 }
 306
 307 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
 308 {
 309         enum v4l2_field field;
 310
 311         spin_lock(&dev->slock);
 312         if (dev->ts_q.curr) {
 313                 field = dev->ts_field;
 314                 if (field != V4L2_FIELD_TOP) {
 315                         if ((status & 0x100000) != 0x000000)
 316                                 goto done;
 317                 } else {
 318                         if ((status & 0x100000) != 0x100000)
 319                                 goto done;
 320                 }
 321                 saa7134_buffer_finish(dev, &dev->ts_q, VB2_BUF_STATE_DONE);
 322         }
 323         saa7134_buffer_next(dev,&dev->ts_q);
 324
 325  done:
 326         spin_unlock(&dev->slock);
 327 }