drivers/media/video/cx23885/cx23885-vbi.c

   1 /*
   2  *  Driver for the Conexant CX23885 PCIe bridge
   3  *
   4  *  Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/moduleparam.h>
  25 #include <linux/init.h>
  26
  27 #include "cx23885.h"
  28
  29 static unsigned int vbibufs = 4;
  30 module_param(vbibufs, int, 0644);
  31 MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
  32
  33 static unsigned int vbi_debug;
  34 module_param(vbi_debug, int, 0644);
  35 MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
  36
  37 #define dprintk(level, fmt, arg...)\
  38         do { if (vbi_debug >= level)\
  39                 printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
  40         } while (0)
  41
  42 /* ------------------------------------------------------------------ */
  43
  44 #define VBI_LINE_LENGTH 1440
  45 #define NTSC_VBI_START_LINE 10        /* line 10 - 21 */
  46 #define NTSC_VBI_END_LINE   21
  47 #define NTSC_VBI_LINES      (NTSC_VBI_END_LINE - NTSC_VBI_START_LINE + 1)
  48
  49
  50 int cx23885_vbi_fmt(struct file *file, void *priv,
  51         struct v4l2_format *f)
  52 {
  53         struct cx23885_fh *fh = priv;
  54         struct cx23885_dev *dev = fh->dev;
  55
  56         if (dev->tvnorm & V4L2_STD_525_60) {
  57                 /* ntsc */
  58                 f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
  59                 f->fmt.vbi.sampling_rate = 27000000;
  60                 f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
  61                 f->fmt.vbi.offset = 0;
  62                 f->fmt.vbi.flags = 0;
  63                 f->fmt.vbi.start[0] = 10;
  64                 f->fmt.vbi.count[0] = 17;
  65                 f->fmt.vbi.start[1] = 263 + 10 + 1;
  66                 f->fmt.vbi.count[1] = 17;
  67         } else if (dev->tvnorm & V4L2_STD_625_50) {
  68                 /* pal */
  69                 f->fmt.vbi.sampling_rate = 35468950;
  70                 f->fmt.vbi.start[0] = 7 - 1;
  71                 f->fmt.vbi.start[1] = 319 - 1;
  72         }
  73
  74         return 0;
  75 }
  76
  77 /* We're given the Video Interrupt status register.
  78  * The cx23885_video_irq() func has already validated
  79  * the potential error bits, we just need to
  80  * deal with vbi payload and return indication if
  81  * we actually processed any payload.
  82  */
  83 int cx23885_vbi_irq(struct cx23885_dev *dev, u32 status)
  84 {
  85         u32 count;
  86         int handled = 0;
  87
  88         if (status & VID_BC_MSK_VBI_RISCI1) {
  89                 dprintk(1, "%s() VID_BC_MSK_VBI_RISCI1\n", __func__);
  90                 spin_lock(&dev->slock);
  91                 count = cx_read(VID_A_GPCNT);
  92                 cx23885_video_wakeup(dev, &dev->vbiq, count);
  93                 spin_unlock(&dev->slock);
  94                 handled++;
  95         }
  96
  97         if (status & VID_BC_MSK_VBI_RISCI2) {
  98                 dprintk(1, "%s() VID_BC_MSK_VBI_RISCI2\n", __func__);
  99                 dprintk(2, "stopper vbi\n");
 100                 spin_lock(&dev->slock);
 101                 cx23885_restart_vbi_queue(dev, &dev->vbiq);
 102                 spin_unlock(&dev->slock);
 103                 handled++;
 104         }
 105
 106         return handled;
 107 }
 108
 109 static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,
 110                          struct cx23885_dmaqueue *q,
 111                          struct cx23885_buffer   *buf)
 112 {
 113         dprintk(1, "%s()\n", __func__);
 114
 115         /* setup fifo + format */
 116         cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
 117                                 buf->vb.width, buf->risc.dma);
 118
 119         /* reset counter */
 120         cx_write(VID_A_GPCNT_CTL, 3);
 121         cx_write(VID_A_VBI_CTRL, 3);
 122         cx_write(VBI_A_GPCNT_CTL, 3);
 123         q->count = 1;
 124
 125         /* enable irq */
 126         cx23885_irq_add_enable(dev, 0x01);
 127         cx_set(VID_A_INT_MSK, 0x000022);
 128
 129         /* start dma */
 130         cx_set(DEV_CNTRL2, (1<<5));
 131         cx_set(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
 132
 133         return 0;
 134 }
 135
 136
 137 int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,
 138                              struct cx23885_dmaqueue *q)
 139 {
 140         struct cx23885_buffer *buf;
 141         struct list_head *item;
 142
 143         if (list_empty(&q->active))
 144                 return 0;
 145
 146         buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
 147         dprintk(2, "restart_queue [%p/%d]: restart dma\n",
 148                 buf, buf->vb.i);
 149         cx23885_start_vbi_dma(dev, q, buf);
 150         list_for_each(item, &q->active) {
 151                 buf = list_entry(item, struct cx23885_buffer, vb.queue);
 152                 buf->count = q->count++;
 153         }
 154         mod_timer(&q->timeout, jiffies + (BUFFER_TIMEOUT / 30));
 155         return 0;
 156 }
 157
 158 void cx23885_vbi_timeout(unsigned long data)
 159 {
 160         struct cx23885_dev *dev = (struct cx23885_dev *)data;
 161         struct cx23885_dmaqueue *q = &dev->vbiq;
 162         struct cx23885_buffer *buf;
 163         unsigned long flags;
 164
 165         /* Stop the VBI engine */
 166         cx_clear(VID_A_DMA_CTL, 0x22);
 167
 168         spin_lock_irqsave(&dev->slock, flags);
 169         while (!list_empty(&q->active)) {
 170                 buf = list_entry(q->active.next, struct cx23885_buffer,
 171                         vb.queue);
 172                 list_del(&buf->vb.queue);
 173                 buf->vb.state = VIDEOBUF_ERROR;
 174                 wake_up(&buf->vb.done);
 175                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
 176                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 177         }
 178         cx23885_restart_vbi_queue(dev, q);
 179         spin_unlock_irqrestore(&dev->slock, flags);
 180 }
 181
 182 /* ------------------------------------------------------------------ */
 183 #define VBI_LINE_LENGTH 1440
 184 #define VBI_LINE_COUNT 17
 185
 186 static int
 187 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 188 {
 189         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 190         if (0 == *count)
 191                 *count = vbibufs;
 192         if (*count < 2)
 193                 *count = 2;
 194         if (*count > 32)
 195                 *count = 32;
 196         return 0;
 197 }
 198
 199 static int
 200 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 201             enum v4l2_field field)
 202 {
 203         struct cx23885_fh *fh  = q->priv_data;
 204         struct cx23885_dev *dev = fh->dev;
 205         struct cx23885_buffer *buf = container_of(vb,
 206                 struct cx23885_buffer, vb);
 207         struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
 208         unsigned int size;
 209         int rc;
 210
 211         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 212         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 213                 return -EINVAL;
 214
 215         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 216                 buf->vb.width  = VBI_LINE_LENGTH;
 217                 buf->vb.height = VBI_LINE_COUNT;
 218                 buf->vb.size   = size;
 219                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 220
 221                 rc = videobuf_iolock(q, &buf->vb, NULL);
 222                 if (0 != rc)
 223                         goto fail;
 224                 cx23885_risc_vbibuffer(dev->pci, &buf->risc,
 225                                  dma->sglist,
 226                                  0, buf->vb.width * buf->vb.height,
 227                                  buf->vb.width, 0,
 228                                  buf->vb.height);
 229         }
 230         buf->vb.state = VIDEOBUF_PREPARED;
 231         return 0;
 232
 233  fail:
 234         cx23885_free_buffer(q, buf);
 235         return rc;
 236 }
 237
 238 static void
 239 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 240 {
 241         struct cx23885_buffer   *buf =
 242                 container_of(vb, struct cx23885_buffer, vb);
 243         struct cx23885_buffer   *prev;
 244         struct cx23885_fh       *fh   = vq->priv_data;
 245         struct cx23885_dev      *dev  = fh->dev;
 246         struct cx23885_dmaqueue *q    = &dev->vbiq;
 247
 248         /* add jump to stopper */
 249         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 250         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 251         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 252
 253         if (list_empty(&q->active)) {
 254                 list_add_tail(&buf->vb.queue, &q->active);
 255                 cx23885_start_vbi_dma(dev, q, buf);
 256                 buf->vb.state = VIDEOBUF_ACTIVE;
 257                 buf->count    = q->count++;
 258                 mod_timer(&q->timeout, jiffies + (BUFFER_TIMEOUT / 30));
 259                 dprintk(2, "[%p/%d] vbi_queue - first active\n",
 260                         buf, buf->vb.i);
 261
 262         } else {
 263                 prev = list_entry(q->active.prev, struct cx23885_buffer,
 264                         vb.queue);
 265                 list_add_tail(&buf->vb.queue, &q->active);
 266                 buf->vb.state = VIDEOBUF_ACTIVE;
 267                 buf->count    = q->count++;
 268                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 269                 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
 270                 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
 271                         buf, buf->vb.i);
 272         }
 273 }
 274
 275 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 276 {
 277         struct cx23885_buffer *buf =
 278                 container_of(vb, struct cx23885_buffer, vb);
 279
 280         cx23885_free_buffer(q, buf);
 281 }
 282
 283 struct videobuf_queue_ops cx23885_vbi_qops = {
 284         .buf_setup    = vbi_setup,
 285         .buf_prepare  = vbi_prepare,
 286         .buf_queue    = vbi_queue,
 287         .buf_release  = vbi_release,
 288 };
 289
 290 /* ------------------------------------------------------------------ */
 291 /*
 292  * Local variables:
 293  * c-basic-offset: 8
 294  * End:
 295  */