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 #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
  89 static int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,
  90                              struct cx23885_dmaqueue *q)
  91 {
  92         struct cx23885_buffer *buf;
  93         struct list_head *item;
  94
  95         if (list_empty(&q->active))
  96                 return 0;
  97
  98         buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
  99         dprintk(2, "restart_queue [%p/%d]: restart dma\n",
 100                 buf, buf->vb.i);
 101         cx23885_start_vbi_dma(dev, q, buf);
 102         list_for_each(item, &q->active) {
 103                 buf = list_entry(item, struct cx23885_buffer, vb.queue);
 104                 buf->count = q->count++;
 105         }
 106         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 107         return 0;
 108 }
 109
 110 void cx23885_vbi_timeout(unsigned long data)
 111 {
 112         struct cx23885_dev *dev = (struct cx23885_dev *)data;
 113         struct cx23885_dmaqueue *q = &dev->vbiq;
 114         struct cx23885_buffer *buf;
 115         unsigned long flags;
 116
 117         cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);
 118
 119         cx_clear(VID_A_DMA_CTL, 0x22);
 120
 121         spin_lock_irqsave(&dev->slock, flags);
 122         while (!list_empty(&q->active)) {
 123                 buf = list_entry(q->active.next, struct cx23885_buffer,
 124                         vb.queue);
 125                 list_del(&buf->vb.queue);
 126                 buf->vb.state = VIDEOBUF_ERROR;
 127                 wake_up(&buf->vb.done);
 128                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
 129                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
 130         }
 131         cx23885_restart_vbi_queue(dev, q);
 132         spin_unlock_irqrestore(&dev->slock, flags);
 133 }
 134
 135 /* ------------------------------------------------------------------ */
 136 #define VBI_LINE_LENGTH 2048
 137 #define VBI_LINE_COUNT 17
 138
 139 static int
 140 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
 141 {
 142         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 143         if (0 == *count)
 144                 *count = vbibufs;
 145         if (*count < 2)
 146                 *count = 2;
 147         if (*count > 32)
 148                 *count = 32;
 149         return 0;
 150 }
 151
 152 static int
 153 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
 154             enum v4l2_field field)
 155 {
 156         struct cx23885_fh *fh  = q->priv_data;
 157         struct cx23885_dev *dev = fh->dev;
 158         struct cx23885_buffer *buf = container_of(vb,
 159                 struct cx23885_buffer, vb);
 160         struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
 161         unsigned int size;
 162         int rc;
 163
 164         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
 165         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
 166                 return -EINVAL;
 167
 168         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
 169                 buf->vb.width  = VBI_LINE_LENGTH;
 170                 buf->vb.height = VBI_LINE_COUNT;
 171                 buf->vb.size   = size;
 172                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
 173
 174                 rc = videobuf_iolock(q, &buf->vb, NULL);
 175                 if (0 != rc)
 176                         goto fail;
 177                 cx23885_risc_buffer(dev->pci, &buf->risc,
 178                                  dma->sglist,
 179                                  0, buf->vb.width * buf->vb.height,
 180                                  buf->vb.width, 0,
 181                                  buf->vb.height);
 182         }
 183         buf->vb.state = VIDEOBUF_PREPARED;
 184         return 0;
 185
 186  fail:
 187         cx23885_free_buffer(q, buf);
 188         return rc;
 189 }
 190
 191 static void
 192 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
 193 {
 194         struct cx23885_buffer   *buf =
 195                 container_of(vb, struct cx23885_buffer, vb);
 196         struct cx23885_buffer   *prev;
 197         struct cx23885_fh       *fh   = vq->priv_data;
 198         struct cx23885_dev      *dev  = fh->dev;
 199         struct cx23885_dmaqueue *q    = &dev->vbiq;
 200
 201         /* add jump to stopper */
 202         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
 203         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
 204         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 205
 206         if (list_empty(&q->active)) {
 207                 list_add_tail(&buf->vb.queue, &q->active);
 208                 cx23885_start_vbi_dma(dev, q, buf);
 209                 buf->vb.state = VIDEOBUF_ACTIVE;
 210                 buf->count    = q->count++;
 211                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
 212                 dprintk(2, "[%p/%d] vbi_queue - first active\n",
 213                         buf, buf->vb.i);
 214
 215         } else {
 216                 prev = list_entry(q->active.prev, struct cx23885_buffer,
 217                         vb.queue);
 218                 list_add_tail(&buf->vb.queue, &q->active);
 219                 buf->vb.state = VIDEOBUF_ACTIVE;
 220                 buf->count    = q->count++;
 221                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 222                 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
 223                 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
 224                         buf, buf->vb.i);
 225         }
 226 }
 227
 228 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
 229 {
 230         struct cx23885_buffer *buf =
 231                 container_of(vb, struct cx23885_buffer, vb);
 232
 233         cx23885_free_buffer(q, buf);
 234 }
 235
 236 struct videobuf_queue_ops cx23885_vbi_qops = {
 237         .buf_setup    = vbi_setup,
 238         .buf_prepare  = vbi_prepare,
 239         .buf_queue    = vbi_queue,
 240         .buf_release  = vbi_release,
 241 };
 242
 243 /* ------------------------------------------------------------------ */
 244 /*
 245  * Local variables:
 246  * c-basic-offset: 8
 247  * End:
 248  */