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
  19 #include "saa7134.h"
  20 #include "saa7134-reg.h"
  21
  22 #include <linux/init.h>
  23 #include <linux/list.h>
  24 #include <linux/module.h>
  25 #include <linux/kernel.h>
  26
  27 /* ------------------------------------------------------------------ */
  28
  29 static unsigned int vbi_debug;
  30 module_param(vbi_debug, int, 0644);
  31 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
  32
  33 static unsigned int vbibufs = 4;
  34 module_param(vbibufs, int, 0444);
  35 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  36
  37 #define vbi_dbg(fmt, arg...) do { \
  38         if (vbi_debug) \
  39                 printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
  40         } while (0)
  41
  42 /* ------------------------------------------------------------------ */
  43
  44 #define VBI_LINE_COUNT     17
  45 #define VBI_LINE_LENGTH  2048
  46 #define VBI_SCALE       0x200
  47
  48 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  49                       int task)
  50 {
  51         struct saa7134_tvnorm *norm = dev->tvnorm;
  52
  53         /* setup video scaler */
  54         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  55         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  56         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  57         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  58         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
  59         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
  60         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
  61         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
  62
  63         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  64         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  65         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  66         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  67
  68         saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
  69         saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
  70         saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
  71         saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
  72
  73         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  74 }
  75
  76 /* ------------------------------------------------------------------ */
  77
  78 static int buffer_activate(struct saa7134_dev *dev,
  79                            struct saa7134_buf *buf,
  80                            struct saa7134_buf *next)
  81 {
  82         struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv;
  83         unsigned long control, base;
  84
  85         vbi_dbg("buffer_activate [%p]\n", buf);
  86         buf->top_seen = 0;
  87
  88         task_init(dev, buf, TASK_A);
  89         task_init(dev, buf, TASK_B);
  90         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  91         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  92
  93         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  94         base    = saa7134_buffer_base(buf);
  95         control = SAA7134_RS_CONTROL_BURST_16 |
  96                 SAA7134_RS_CONTROL_ME |
  97                 (dmaq->pt.dma >> 12);
  98         saa_writel(SAA7134_RS_BA1(2), base);
  99         saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
 100         saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
 101         saa_writel(SAA7134_RS_CONTROL(2), control);
 102         saa_writel(SAA7134_RS_BA1(3), base);
 103         saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
 104         saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
 105         saa_writel(SAA7134_RS_CONTROL(3), control);
 106
 107         /* start DMA */
 108         saa7134_set_dmabits(dev);
 109         mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
 110
 111         return 0;
 112 }
 113
 114 static int buffer_prepare(struct vb2_buffer *vb2)
 115 {
 116         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 117         struct saa7134_dev *dev = dmaq->dev;
 118         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
 119         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
 120         struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
 121         unsigned int size;
 122
 123         if (dma->sgl->offset) {
 124                 pr_err("The buffer is not page-aligned\n");
 125                 return -EINVAL;
 126         }
 127         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 128         if (vb2_plane_size(vb2, 0) < size)
 129                 return -EINVAL;
 130
 131         vb2_set_plane_payload(vb2, 0, size);
 132
 133         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 134                                     saa7134_buffer_startpage(buf));
 135 }
 136
 137 static int queue_setup(struct vb2_queue *q,
 138                            unsigned int *nbuffers, unsigned int *nplanes,
 139                            unsigned int sizes[], struct device *alloc_devs[])
 140 {
 141         struct saa7134_dmaqueue *dmaq = q->drv_priv;
 142         struct saa7134_dev *dev = dmaq->dev;
 143         unsigned int size;
 144
 145         dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
 146         if (dev->vbi_vlen > VBI_LINE_COUNT)
 147                 dev->vbi_vlen = VBI_LINE_COUNT;
 148         dev->vbi_hlen = VBI_LINE_LENGTH;
 149         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 150
 151         *nbuffers = saa7134_buffer_count(size, *nbuffers);
 152         *nplanes = 1;
 153         sizes[0] = size;
 154         return 0;
 155 }
 156
 157 static int buffer_init(struct vb2_buffer *vb2)
 158 {
 159         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 160         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
 161         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
 162
 163         dmaq->curr = NULL;
 164         buf->activate = buffer_activate;
 165         return 0;
 166 }
 167
 168 const struct vb2_ops saa7134_vbi_qops = {
 169         .queue_setup    = queue_setup,
 170         .buf_init       = buffer_init,
 171         .buf_prepare    = buffer_prepare,
 172         .buf_queue      = saa7134_vb2_buffer_queue,
 173         .wait_prepare   = vb2_ops_wait_prepare,
 174         .wait_finish    = vb2_ops_wait_finish,
 175         .start_streaming = saa7134_vb2_start_streaming,
 176         .stop_streaming = saa7134_vb2_stop_streaming,
 177 };
 178
 179 /* ------------------------------------------------------------------ */
 180
 181 int saa7134_vbi_init1(struct saa7134_dev *dev)
 182 {
 183         INIT_LIST_HEAD(&dev->vbi_q.queue);
 184         timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
 185         dev->vbi_q.dev              = dev;
 186
 187         if (vbibufs < 2)
 188                 vbibufs = 2;
 189         if (vbibufs > VIDEO_MAX_FRAME)
 190                 vbibufs = VIDEO_MAX_FRAME;
 191         return 0;
 192 }
 193
 194 int saa7134_vbi_fini(struct saa7134_dev *dev)
 195 {
 196         /* nothing */
 197         return 0;
 198 }
 199
 200 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 201 {
 202         spin_lock(&dev->slock);
 203         if (dev->vbi_q.curr) {
 204                 /* make sure we have seen both fields */
 205                 if ((status & 0x10) == 0x00) {
 206                         dev->vbi_q.curr->top_seen = 1;
 207                         goto done;
 208                 }
 209                 if (!dev->vbi_q.curr->top_seen)
 210                         goto done;
 211
 212                 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
 213         }
 214         saa7134_buffer_next(dev, &dev->vbi_q);
 215
 216  done:
 217         spin_unlock(&dev->slock);
 218 }