git.oblomov.eu Git - linux-2.6/blob - 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 = 0;
  35 module_param(vbi_debug, int, 0644);
  36 MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
  37
  38 #define dprintk(level, fmt, arg...)     if (vbi_debug >= level) \
  39         printk(KERN_DEBUG "%s: " fmt, dev->name , ## arg)
  40
  41 /* ------------------------------------------------------------------ */
  42
  43 int cx23885_vbi_fmt(struct file *file, void *priv,
  44         struct v4l2_format *f)
  45 {
  46         struct cx23885_fh *fh = priv;
  47         struct cx23885_dev *dev = fh->dev;
  48
  49         if (dev->tvnorm & V4L2_STD_525_60) {
  50                 /* ntsc */
  51                 f->fmt.vbi.sampling_rate = 28636363;
  52                 f->fmt.vbi.start[0] = 10;
  53                 f->fmt.vbi.start[1] = 273;
  54
  55         } else if (dev->tvnorm & V4L2_STD_625_50) {
  56                 /* pal */
  57                 f->fmt.vbi.sampling_rate = 35468950;
  58                 f->fmt.vbi.start[0] = 7 - 1;
  59                 f->fmt.vbi.start[1] = 319 - 1;
  60         }
  61         return 0;
  62 }
  63
  64 static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,
  65                          struct cx23885_dmaqueue *q,
  66                          struct cx23885_buffer   *buf)
  67 {
  68         /* setup fifo + format */
  69         cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
  70                                 buf->vb.width, buf->risc.dma);
  71
  72         /* reset counter */
  73         q->count = 1;
  74
  75         /* enable irqs */
  76         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | 0x01);
  77         cx_set(VID_A_INT_MSK, 0x000022);
  78
  79         /* start dma */
  80         cx_set(DEV_CNTRL2, (1<<5));
  81         cx_set(VID_A_DMA_CTL, 0x00000022);
  82
  83         return 0;
  84 }
  85
  86 int cx23885_stop_vbi_dma(struct cx23885_dev *dev)
  87 {
  88         /* stop dma */
  89         cx_clear(VID_A_DMA_CTL, 0x00000022);
  90
  91         /* disable irqs */
  92         cx_clear(PCI_INT_MSK, 0x000001);
  93         cx_clear(VID_A_INT_MSK, 0x00000022);
  94         return 0;
  95 }
  96
  97 int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,
  98                              struct cx23885_dmaqueue *q)
  99 {
 100         struct cx23885_buffer *buf;
 101         struct list_head *item;
 102
 103         if (list_empty(&q->active))
 104                 return 0;
 105
 106         buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
 107         dprintk(2, "restart_queue [%p/%d]: restart dma\n",
 108                 buf, buf->vb.i);
 109         cx23885_start_vbi_dma(dev, q, buf);
 110         list_for_each(item, &q->active) {
 111                 buf = list_entry(item, struct cx23885_buffer, vb.queue);
 112                 buf->count = q->count++;
 113         }
 114         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 115         return 0;
 116 }
 117
 118 void cx23885_vbi_timeout(unsigned long data)
 119 {
 120         struct cx23885_dev *dev = (struct cx23885_dev *)data;
 121         struct cx23885_dmaqueue *q = &dev->vbiq;
 122         struct cx23885_buffer *buf;
 123         unsigned long flags;
 124
 125         cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);
 126
 127         cx_clear(VID_A_DMA_CTL, 0x22);
 128
 129         spin_lock_irqsave(&dev->slock, flags);
 130         while (!list_empty(&q->active)) {
 131                 buf = list_entry(q->active.next, struct cx23885_buffer,
 132                         vb.queue);
 133                 list_del(&buf->vb.queue);
 134                 buf->vb.state = VIDEOBUF_ERROR;
 135                 wake_up(&buf->vb.done);
 136                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
 137                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 138         }
 139         cx23885_restart_vbi_queue(dev, q);
 140         spin_unlock_irqrestore(&dev->slock, flags);
 141 }
 142
 143 /* ------------------------------------------------------------------ */
 144 #define VBI_LINE_LENGTH 2048
 145 #define VBI_LINE_COUNT 17
 146
 147 static int
 148 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 149 {
 150         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 151         if (0 == *count)
 152                 *count = vbibufs;
 153         if (*count < 2)
 154                 *count = 2;
 155         if (*count > 32)
 156                 *count = 32;
 157         return 0;
 158 }
 159
 160 static int
 161 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 162             enum v4l2_field field)
 163 {
 164         struct cx23885_fh *fh  = q->priv_data;
 165         struct cx23885_dev *dev = fh->dev;
 166         struct cx23885_buffer *buf = container_of(vb,
 167                 struct cx23885_buffer, vb);
 168         struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
 169         unsigned int size;
 170         int rc;
 171
 172         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 173         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 174                 return -EINVAL;
 175
 176         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 177                 buf->vb.width  = VBI_LINE_LENGTH;
 178                 buf->vb.height = VBI_LINE_COUNT;
 179                 buf->vb.size   = size;
 180                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 181
 182                 rc = videobuf_iolock(q, &buf->vb, NULL);
 183                 if (0 != rc)
 184                         goto fail;
 185                 cx23885_risc_buffer(dev->pci, &buf->risc,
 186                                  dma->sglist,
 187                                  0, buf->vb.width * buf->vb.height,
 188                                  buf->vb.width, 0,
 189                                  buf->vb.height);
 190         }
 191         buf->vb.state = VIDEOBUF_PREPARED;
 192         return 0;
 193
 194  fail:
 195         cx23885_free_buffer(q, buf);
 196         return rc;
 197 }
 198
 199 static void
 200 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 201 {
 202         struct cx23885_buffer   *buf =
 203                 container_of(vb, struct cx23885_buffer, vb);
 204         struct cx23885_buffer   *prev;
 205         struct cx23885_fh       *fh   = vq->priv_data;
 206         struct cx23885_dev      *dev  = fh->dev;
 207         struct cx23885_dmaqueue *q    = &dev->vbiq;
 208
 209         /* add jump to stopper */
 210         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 211         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 212         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 213
 214         if (list_empty(&q->active)) {
 215                 list_add_tail(&buf->vb.queue, &q->active);
 216                 cx23885_start_vbi_dma(dev, q, buf);
 217                 buf->vb.state = VIDEOBUF_ACTIVE;
 218                 buf->count    = q->count++;
 219                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 220                 dprintk(2, "[%p/%d] vbi_queue - first active\n",
 221                         buf, buf->vb.i);
 222
 223         } else {
 224                 prev = list_entry(q->active.prev, struct cx23885_buffer,
 225                         vb.queue);
 226                 list_add_tail(&buf->vb.queue, &q->active);
 227                 buf->vb.state = VIDEOBUF_ACTIVE;
 228                 buf->count    = q->count++;
 229                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 230                 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
 231                 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
 232                         buf, buf->vb.i);
 233         }
 234 }
 235
 236 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 237 {
 238         struct cx23885_buffer *buf =
 239                 container_of(vb, struct cx23885_buffer, vb);
 240
 241         cx23885_free_buffer(q, buf);
 242 }
 243
 244 struct videobuf_queue_ops cx23885_vbi_qops = {
 245         .buf_setup    = vbi_setup,
 246         .buf_prepare  = vbi_prepare,
 247         .buf_queue    = vbi_queue,
 248         .buf_release  = vbi_release,
 249 };
 250
 251 /* ------------------------------------------------------------------ */
 252 /*
 253  * Local variables:
 254  * c-basic-offset: 8
 255  * End:
 256  */