drivers/media/pci/saa7134/saa7134-vbi.c

   1 /*
   2  *
   3  * device driver for philips saa7134 based TV cards
   4  * video4linux video interface
   5  *
   6  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #include <linux/init.h>
  24 #include <linux/list.h>
  25 #include <linux/module.h>
  26 #include <linux/kernel.h>
  27
  28 #include "saa7134-reg.h"
  29 #include "saa7134.h"
  30
  31 /* ------------------------------------------------------------------ */
  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 static unsigned int vbibufs = 4;
  38 module_param(vbibufs, int, 0444);
  39 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  40
  41 #define dprintk(fmt, arg...)    if (vbi_debug) \
  42         printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
  43
  44 /* ------------------------------------------------------------------ */
  45
  46 #define VBI_LINE_COUNT     16
  47 #define VBI_LINE_LENGTH  2048
  48 #define VBI_SCALE       0x200
  49
  50 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  51                       int task)
  52 {
  53         struct saa7134_tvnorm *norm = dev->tvnorm;
  54
  55         /* setup video scaler */
  56         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  57         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  58         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  59         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  60         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
  61         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
  62         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
  63         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
  64
  65         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  66         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  67         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  68         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  69
  70         saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
  71         saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
  72         saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
  73         saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
  74
  75         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  76 }
  77
  78 /* ------------------------------------------------------------------ */
  79
  80 static int buffer_activate(struct saa7134_dev *dev,
  81                            struct saa7134_buf *buf,
  82                            struct saa7134_buf *next)
  83 {
  84         struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_queue->drv_priv;
  85         unsigned long control, base;
  86
  87         dprintk("buffer_activate [%p]\n", buf);
  88         buf->top_seen = 0;
  89
  90         task_init(dev, buf, TASK_A);
  91         task_init(dev, buf, TASK_B);
  92         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  93         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  94
  95         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  96         base    = saa7134_buffer_base(buf);
  97         control = SAA7134_RS_CONTROL_BURST_16 |
  98                 SAA7134_RS_CONTROL_ME |
  99                 (dmaq->pt.dma >> 12);
 100         saa_writel(SAA7134_RS_BA1(2), base);
 101         saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
 102         saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
 103         saa_writel(SAA7134_RS_CONTROL(2), control);
 104         saa_writel(SAA7134_RS_BA1(3), base);
 105         saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
 106         saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
 107         saa_writel(SAA7134_RS_CONTROL(3), control);
 108
 109         /* start DMA */
 110         saa7134_set_dmabits(dev);
 111         mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
 112
 113         return 0;
 114 }
 115
 116 static int buffer_prepare(struct vb2_buffer *vb2)
 117 {
 118         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 119         struct saa7134_dev *dev = dmaq->dev;
 120         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
 121         struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
 122         unsigned int size;
 123         int ret;
 124
 125         if (dma->sgl->offset) {
 126                 pr_err("The buffer is not page-aligned\n");
 127                 return -EINVAL;
 128         }
 129         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 130         if (vb2_plane_size(vb2, 0) < size)
 131                 return -EINVAL;
 132
 133         vb2_set_plane_payload(vb2, 0, size);
 134
 135         ret = dma_map_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE);
 136         if (!ret)
 137                 return -EIO;
 138         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 139                                     saa7134_buffer_startpage(buf));
 140 }
 141
 142 static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
 143                            unsigned int *nbuffers, unsigned int *nplanes,
 144                            unsigned int sizes[], void *alloc_ctxs[])
 145 {
 146         struct saa7134_dmaqueue *dmaq = q->drv_priv;
 147         struct saa7134_dev *dev = dmaq->dev;
 148         unsigned int size;
 149
 150         dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
 151         if (dev->vbi_vlen > VBI_LINE_COUNT)
 152                 dev->vbi_vlen = VBI_LINE_COUNT;
 153         dev->vbi_hlen = VBI_LINE_LENGTH;
 154         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 155
 156         *nbuffers = saa7134_buffer_count(size, *nbuffers);
 157         *nplanes = 1;
 158         sizes[0] = size;
 159         return 0;
 160 }
 161
 162 static int buffer_init(struct vb2_buffer *vb2)
 163 {
 164         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 165         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
 166
 167         dmaq->curr = NULL;
 168         buf->activate = buffer_activate;
 169         return 0;
 170 }
 171
 172 static void buffer_finish(struct vb2_buffer *vb2)
 173 {
 174         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 175         struct saa7134_dev *dev = dmaq->dev;
 176         struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
 177         struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
 178
 179         dma_unmap_sg(&dev->pci->dev, dma->sgl, dma->nents, DMA_FROM_DEVICE);
 180 }
 181
 182 struct vb2_ops saa7134_vbi_qops = {
 183         .queue_setup    = queue_setup,
 184         .buf_init       = buffer_init,
 185         .buf_prepare    = buffer_prepare,
 186         .buf_finish     = buffer_finish,
 187         .buf_queue      = saa7134_vb2_buffer_queue,
 188         .wait_prepare   = vb2_ops_wait_prepare,
 189         .wait_finish    = vb2_ops_wait_finish,
 190         .start_streaming = saa7134_vb2_start_streaming,
 191         .stop_streaming = saa7134_vb2_stop_streaming,
 192 };
 193
 194 /* ------------------------------------------------------------------ */
 195
 196 int saa7134_vbi_init1(struct saa7134_dev *dev)
 197 {
 198         INIT_LIST_HEAD(&dev->vbi_q.queue);
 199         init_timer(&dev->vbi_q.timeout);
 200         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 201         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 202         dev->vbi_q.dev              = dev;
 203
 204         if (vbibufs < 2)
 205                 vbibufs = 2;
 206         if (vbibufs > VIDEO_MAX_FRAME)
 207                 vbibufs = VIDEO_MAX_FRAME;
 208         return 0;
 209 }
 210
 211 int saa7134_vbi_fini(struct saa7134_dev *dev)
 212 {
 213         /* nothing */
 214         return 0;
 215 }
 216
 217 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 218 {
 219         spin_lock(&dev->slock);
 220         if (dev->vbi_q.curr) {
 221                 /* make sure we have seen both fields */
 222                 if ((status & 0x10) == 0x00) {
 223                         dev->vbi_q.curr->top_seen = 1;
 224                         goto done;
 225                 }
 226                 if (!dev->vbi_q.curr->top_seen)
 227                         goto done;
 228
 229                 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
 230         }
 231         saa7134_buffer_next(dev, &dev->vbi_q);
 232
 233  done:
 234         spin_unlock(&dev->slock);
 235 }