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

   1 /*
   2  *  Driver for the Conexant CX23885 PCIe bridge
   3  *
   4  *  Copyright (c) 2007 Steven Toth <stoth@hauppauge.com>
   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 #include <linux/slab.h>
  27
  28 #include "cx23885.h"
  29
  30 static unsigned int vbibufs = 4;
  31 module_param(vbibufs, int, 0644);
  32 MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
  33
  34 static unsigned int vbi_debug;
  35 module_param(vbi_debug, int, 0644);
  36 MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
  37
  38 #define dprintk(level, fmt, arg...)\
  39         do { if (vbi_debug >= level)\
  40                 printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
  41         } while (0)
  42
  43 /* ------------------------------------------------------------------ */
  44
  45 int cx23885_vbi_fmt(struct file *file, void *priv,
  46         struct v4l2_format *f)
  47 {
  48         struct cx23885_fh *fh = priv;
  49         struct cx23885_dev *dev = fh->dev;
  50
  51         if (dev->tvnorm & V4L2_STD_525_60) {
  52                 /* ntsc */
  53                 f->fmt.vbi.sampling_rate = 28636363;
  54                 f->fmt.vbi.start[0] = 10;
  55                 f->fmt.vbi.start[1] = 273;
  56
  57         } else if (dev->tvnorm & V4L2_STD_625_50) {
  58                 /* pal */
  59                 f->fmt.vbi.sampling_rate = 35468950;
  60                 f->fmt.vbi.start[0] = 7 - 1;
  61                 f->fmt.vbi.start[1] = 319 - 1;
  62         }
  63         return 0;
  64 }
  65
  66 static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,
  67                          struct cx23885_dmaqueue *q,
  68                          struct cx23885_buffer   *buf)
  69 {
  70         /* setup fifo + format */
  71         cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
  72                                 buf->vb.width, buf->risc.dma);
  73
  74         /* reset counter */
  75         q->count = 1;
  76
  77         /* enable irqs */
  78         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | 0x01);
  79         cx_set(VID_A_INT_MSK, 0x000022);
  80
  81         /* start dma */
  82         cx_set(DEV_CNTRL2, (1<<5));
  83         cx_set(VID_A_DMA_CTL, 0x00000022);
  84
  85         return 0;
  86 }
  87
  88 int cx23885_stop_vbi_dma(struct cx23885_dev *dev)
  89 {
  90         /* stop dma */
  91         cx_clear(VID_A_DMA_CTL, 0x00000022);
  92
  93         /* disable irqs */
  94         cx_clear(PCI_INT_MSK, 0x000001);
  95         cx_clear(VID_A_INT_MSK, 0x00000022);
  96         return 0;
  97 }
  98
  99 int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,
 100                              struct cx23885_dmaqueue *q)
 101 {
 102         struct cx23885_buffer *buf;
 103         struct list_head *item;
 104
 105         if (list_empty(&q->active))
 106                 return 0;
 107
 108         buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
 109         dprintk(2, "restart_queue [%p/%d]: restart dma\n",
 110                 buf, buf->vb.i);
 111         cx23885_start_vbi_dma(dev, q, buf);
 112         list_for_each(item, &q->active) {
 113                 buf = list_entry(item, struct cx23885_buffer, vb.queue);
 114                 buf->count = q->count++;
 115         }
 116         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 117         return 0;
 118 }
 119
 120 void cx23885_vbi_timeout(unsigned long data)
 121 {
 122         struct cx23885_dev *dev = (struct cx23885_dev *)data;
 123         struct cx23885_dmaqueue *q = &dev->vbiq;
 124         struct cx23885_buffer *buf;
 125         unsigned long flags;
 126
 127         cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);
 128
 129         cx_clear(VID_A_DMA_CTL, 0x22);
 130
 131         spin_lock_irqsave(&dev->slock, flags);
 132         while (!list_empty(&q->active)) {
 133                 buf = list_entry(q->active.next, struct cx23885_buffer,
 134                         vb.queue);
 135                 list_del(&buf->vb.queue);
 136                 buf->vb.state = VIDEOBUF_ERROR;
 137                 wake_up(&buf->vb.done);
 138                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
 139                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 140         }
 141         cx23885_restart_vbi_queue(dev, q);
 142         spin_unlock_irqrestore(&dev->slock, flags);
 143 }
 144
 145 /* ------------------------------------------------------------------ */
 146 #define VBI_LINE_LENGTH 2048
 147 #define VBI_LINE_COUNT 17
 148
 149 static int
 150 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 151 {
 152         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 153         if (0 == *count)
 154                 *count = vbibufs;
 155         if (*count < 2)
 156                 *count = 2;
 157         if (*count > 32)
 158                 *count = 32;
 159         return 0;
 160 }
 161
 162 static int
 163 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 164             enum v4l2_field field)
 165 {
 166         struct cx23885_fh *fh  = q->priv_data;
 167         struct cx23885_dev *dev = fh->dev;
 168         struct cx23885_buffer *buf = container_of(vb,
 169                 struct cx23885_buffer, vb);
 170         struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
 171         unsigned int size;
 172         int rc;
 173
 174         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 175         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 176                 return -EINVAL;
 177
 178         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 179                 buf->vb.width  = VBI_LINE_LENGTH;
 180                 buf->vb.height = VBI_LINE_COUNT;
 181                 buf->vb.size   = size;
 182                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 183
 184                 rc = videobuf_iolock(q, &buf->vb, NULL);
 185                 if (0 != rc)
 186                         goto fail;
 187                 cx23885_risc_buffer(dev->pci, &buf->risc,
 188                                  dma->sglist,
 189                                  0, buf->vb.width * buf->vb.height,
 190                                  buf->vb.width, 0,
 191                                  buf->vb.height);
 192         }
 193         buf->vb.state = VIDEOBUF_PREPARED;
 194         return 0;
 195
 196  fail:
 197         cx23885_free_buffer(q, buf);
 198         return rc;
 199 }
 200
 201 static void
 202 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 203 {
 204         struct cx23885_buffer   *buf =
 205                 container_of(vb, struct cx23885_buffer, vb);
 206         struct cx23885_buffer   *prev;
 207         struct cx23885_fh       *fh   = vq->priv_data;
 208         struct cx23885_dev      *dev  = fh->dev;
 209         struct cx23885_dmaqueue *q    = &dev->vbiq;
 210
 211         /* add jump to stopper */
 212         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 213         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 214         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 215
 216         if (list_empty(&q->active)) {
 217                 list_add_tail(&buf->vb.queue, &q->active);
 218                 cx23885_start_vbi_dma(dev, q, buf);
 219                 buf->vb.state = VIDEOBUF_ACTIVE;
 220                 buf->count    = q->count++;
 221                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 222                 dprintk(2, "[%p/%d] vbi_queue - first active\n",
 223                         buf, buf->vb.i);
 224
 225         } else {
 226                 prev = list_entry(q->active.prev, struct cx23885_buffer,
 227                         vb.queue);
 228                 list_add_tail(&buf->vb.queue, &q->active);
 229                 buf->vb.state = VIDEOBUF_ACTIVE;
 230                 buf->count    = q->count++;
 231                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 232                 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
 233                 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
 234                         buf, buf->vb.i);
 235         }
 236 }
 237
 238 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 239 {
 240         struct cx23885_buffer *buf =
 241                 container_of(vb, struct cx23885_buffer, vb);
 242
 243         cx23885_free_buffer(q, buf);
 244 }
 245
 246 struct videobuf_queue_ops cx23885_vbi_qops = {
 247         .buf_setup    = vbi_setup,
 248         .buf_prepare  = vbi_prepare,
 249         .buf_queue    = vbi_queue,
 250         .buf_release  = vbi_release,
 251 };
 252
 253 /* ------------------------------------------------------------------ */
 254 /*
 255  * Local variables:
 256  * c-basic-offset: 8
 257  * End:
 258  */