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 int cx23885_vbi_fmt(struct file *file, void *priv,
  45         struct v4l2_format *f)
  46 {
  47         struct cx23885_fh *fh = priv;
  48         struct cx23885_dev *dev = fh->dev;
  49
  50         if (dev->tvnorm & V4L2_STD_525_60) {
  51                 /* ntsc */
  52                 f->fmt.vbi.sampling_rate = 28636363;
  53                 f->fmt.vbi.start[0] = 10;
  54                 f->fmt.vbi.start[1] = 273;
  55
  56         } else if (dev->tvnorm & V4L2_STD_625_50) {
  57                 /* pal */
  58                 f->fmt.vbi.sampling_rate = 35468950;
  59                 f->fmt.vbi.start[0] = 7 - 1;
  60                 f->fmt.vbi.start[1] = 319 - 1;
  61         }
  62         return 0;
  63 }
  64
  65 static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,
  66                          struct cx23885_dmaqueue *q,
  67                          struct cx23885_buffer   *buf)
  68 {
  69         /* setup fifo + format */
  70         cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
  71                                 buf->vb.width, buf->risc.dma);
  72
  73         /* reset counter */
  74         q->count = 1;
  75
  76         /* enable irqs */
  77         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | 0x01);
  78         cx_set(VID_A_INT_MSK, 0x000022);
  79
  80         /* start dma */
  81         cx_set(DEV_CNTRL2, (1<<5));
  82         cx_set(VID_A_DMA_CTL, 0x00000022);
  83
  84         return 0;
  85 }
  86
  87
  88 static int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,
  89                              struct cx23885_dmaqueue *q)
  90 {
  91         struct cx23885_buffer *buf;
  92         struct list_head *item;
  93
  94         if (list_empty(&q->active))
  95                 return 0;
  96
  97         buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
  98         dprintk(2, "restart_queue [%p/%d]: restart dma\n",
  99                 buf, buf->vb.i);
 100         cx23885_start_vbi_dma(dev, q, buf);
 101         list_for_each(item, &q->active) {
 102                 buf = list_entry(item, struct cx23885_buffer, vb.queue);
 103                 buf->count = q->count++;
 104         }
 105         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 106         return 0;
 107 }
 108
 109 void cx23885_vbi_timeout(unsigned long data)
 110 {
 111         struct cx23885_dev *dev = (struct cx23885_dev *)data;
 112         struct cx23885_dmaqueue *q = &dev->vbiq;
 113         struct cx23885_buffer *buf;
 114         unsigned long flags;
 115
 116         cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);
 117
 118         cx_clear(VID_A_DMA_CTL, 0x22);
 119
 120         spin_lock_irqsave(&dev->slock, flags);
 121         while (!list_empty(&q->active)) {
 122                 buf = list_entry(q->active.next, struct cx23885_buffer,
 123                         vb.queue);
 124                 list_del(&buf->vb.queue);
 125                 buf->vb.state = VIDEOBUF_ERROR;
 126                 wake_up(&buf->vb.done);
 127                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
 128                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 129         }
 130         cx23885_restart_vbi_queue(dev, q);
 131         spin_unlock_irqrestore(&dev->slock, flags);
 132 }
 133
 134 /* ------------------------------------------------------------------ */
 135 #define VBI_LINE_LENGTH 2048
 136 #define VBI_LINE_COUNT 17
 137
 138 static int
 139 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 140 {
 141         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 142         if (0 == *count)
 143                 *count = vbibufs;
 144         if (*count < 2)
 145                 *count = 2;
 146         if (*count > 32)
 147                 *count = 32;
 148         return 0;
 149 }
 150
 151 static int
 152 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 153             enum v4l2_field field)
 154 {
 155         struct cx23885_fh *fh  = q->priv_data;
 156         struct cx23885_dev *dev = fh->dev;
 157         struct cx23885_buffer *buf = container_of(vb,
 158                 struct cx23885_buffer, vb);
 159         struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
 160         unsigned int size;
 161         int rc;
 162
 163         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 164         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 165                 return -EINVAL;
 166
 167         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 168                 buf->vb.width  = VBI_LINE_LENGTH;
 169                 buf->vb.height = VBI_LINE_COUNT;
 170                 buf->vb.size   = size;
 171                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 172
 173                 rc = videobuf_iolock(q, &buf->vb, NULL);
 174                 if (0 != rc)
 175                         goto fail;
 176                 cx23885_risc_buffer(dev->pci, &buf->risc,
 177                                  dma->sglist,
 178                                  0, buf->vb.width * buf->vb.height,
 179                                  buf->vb.width, 0,
 180                                  buf->vb.height);
 181         }
 182         buf->vb.state = VIDEOBUF_PREPARED;
 183         return 0;
 184
 185  fail:
 186         cx23885_free_buffer(q, buf);
 187         return rc;
 188 }
 189
 190 static void
 191 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 192 {
 193         struct cx23885_buffer   *buf =
 194                 container_of(vb, struct cx23885_buffer, vb);
 195         struct cx23885_buffer   *prev;
 196         struct cx23885_fh       *fh   = vq->priv_data;
 197         struct cx23885_dev      *dev  = fh->dev;
 198         struct cx23885_dmaqueue *q    = &dev->vbiq;
 199
 200         /* add jump to stopper */
 201         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 202         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 203         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 204
 205         if (list_empty(&q->active)) {
 206                 list_add_tail(&buf->vb.queue, &q->active);
 207                 cx23885_start_vbi_dma(dev, q, buf);
 208                 buf->vb.state = VIDEOBUF_ACTIVE;
 209                 buf->count    = q->count++;
 210                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 211                 dprintk(2, "[%p/%d] vbi_queue - first active\n",
 212                         buf, buf->vb.i);
 213
 214         } else {
 215                 prev = list_entry(q->active.prev, struct cx23885_buffer,
 216                         vb.queue);
 217                 list_add_tail(&buf->vb.queue, &q->active);
 218                 buf->vb.state = VIDEOBUF_ACTIVE;
 219                 buf->count    = q->count++;
 220                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 221                 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
 222                 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
 223                         buf, buf->vb.i);
 224         }
 225 }
 226
 227 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 228 {
 229         struct cx23885_buffer *buf =
 230                 container_of(vb, struct cx23885_buffer, vb);
 231
 232         cx23885_free_buffer(q, buf);
 233 }
 234
 235 struct videobuf_queue_ops cx23885_vbi_qops = {
 236         .buf_setup    = vbi_setup,
 237         .buf_prepare  = vbi_prepare,
 238         .buf_queue    = vbi_queue,
 239         .buf_release  = vbi_release,
 240 };
 241
 242 /* ------------------------------------------------------------------ */
 243 /*
 244  * Local variables:
 245  * c-basic-offset: 8
 246  * End:
 247  */