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 "saa7134.h"
  24 #include "saa7134-reg.h"
  25
  26 #include <linux/init.h>
  27 #include <linux/list.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.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 vbi_dbg(fmt, arg...) do { \
  42         if (vbi_debug) \
  43                 printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
  44         } while (0)
  45
  46 /* ------------------------------------------------------------------ */
  47
  48 #define VBI_LINE_COUNT     17
  49 #define VBI_LINE_LENGTH  2048
  50 #define VBI_SCALE       0x200
  51
  52 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  53                       int task)
  54 {
  55         struct saa7134_tvnorm *norm = dev->tvnorm;
  56
  57         /* setup video scaler */
  58         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  59         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  60         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  61         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  62         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
  63         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
  64         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
  65         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
  66
  67         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  68         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  69         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  70         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  71
  72         saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
  73         saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
  74         saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
  75         saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
  76
  77         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  78 }
  79
  80 /* ------------------------------------------------------------------ */
  81
  82 static int buffer_activate(struct saa7134_dev *dev,
  83                            struct saa7134_buf *buf,
  84                            struct saa7134_buf *next)
  85 {
  86         struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv;
  87         unsigned long control, base;
  88
  89         vbi_dbg("buffer_activate [%p]\n", buf);
  90         buf->top_seen = 0;
  91
  92         task_init(dev, buf, TASK_A);
  93         task_init(dev, buf, TASK_B);
  94         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  95         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  96
  97         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  98         base    = saa7134_buffer_base(buf);
  99         control = SAA7134_RS_CONTROL_BURST_16 |
 100                 SAA7134_RS_CONTROL_ME |
 101                 (dmaq->pt.dma >> 12);
 102         saa_writel(SAA7134_RS_BA1(2), base);
 103         saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
 104         saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
 105         saa_writel(SAA7134_RS_CONTROL(2), control);
 106         saa_writel(SAA7134_RS_BA1(3), base);
 107         saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
 108         saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
 109         saa_writel(SAA7134_RS_CONTROL(3), control);
 110
 111         /* start DMA */
 112         saa7134_set_dmabits(dev);
 113         mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
 114
 115         return 0;
 116 }
 117
 118 static int buffer_prepare(struct vb2_buffer *vb2)
 119 {
 120         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 121         struct saa7134_dev *dev = dmaq->dev;
 122         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
 123         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
 124         struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
 125         unsigned int size;
 126
 127         if (dma->sgl->offset) {
 128                 pr_err("The buffer is not page-aligned\n");
 129                 return -EINVAL;
 130         }
 131         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 132         if (vb2_plane_size(vb2, 0) < size)
 133                 return -EINVAL;
 134
 135         vb2_set_plane_payload(vb2, 0, size);
 136
 137         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 138                                     saa7134_buffer_startpage(buf));
 139 }
 140
 141 static int queue_setup(struct vb2_queue *q,
 142                            unsigned int *nbuffers, unsigned int *nplanes,
 143                            unsigned int sizes[], struct device *alloc_devs[])
 144 {
 145         struct saa7134_dmaqueue *dmaq = q->drv_priv;
 146         struct saa7134_dev *dev = dmaq->dev;
 147         unsigned int size;
 148
 149         dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
 150         if (dev->vbi_vlen > VBI_LINE_COUNT)
 151                 dev->vbi_vlen = VBI_LINE_COUNT;
 152         dev->vbi_hlen = VBI_LINE_LENGTH;
 153         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 154
 155         *nbuffers = saa7134_buffer_count(size, *nbuffers);
 156         *nplanes = 1;
 157         sizes[0] = size;
 158         return 0;
 159 }
 160
 161 static int buffer_init(struct vb2_buffer *vb2)
 162 {
 163         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 164         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
 165         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
 166
 167         dmaq->curr = NULL;
 168         buf->activate = buffer_activate;
 169         return 0;
 170 }
 171
 172 struct vb2_ops saa7134_vbi_qops = {
 173         .queue_setup    = queue_setup,
 174         .buf_init       = buffer_init,
 175         .buf_prepare    = buffer_prepare,
 176         .buf_queue      = saa7134_vb2_buffer_queue,
 177         .wait_prepare   = vb2_ops_wait_prepare,
 178         .wait_finish    = vb2_ops_wait_finish,
 179         .start_streaming = saa7134_vb2_start_streaming,
 180         .stop_streaming = saa7134_vb2_stop_streaming,
 181 };
 182
 183 /* ------------------------------------------------------------------ */
 184
 185 int saa7134_vbi_init1(struct saa7134_dev *dev)
 186 {
 187         INIT_LIST_HEAD(&dev->vbi_q.queue);
 188         init_timer(&dev->vbi_q.timeout);
 189         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
 190         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
 191         dev->vbi_q.dev              = dev;
 192
 193         if (vbibufs < 2)
 194                 vbibufs = 2;
 195         if (vbibufs > VIDEO_MAX_FRAME)
 196                 vbibufs = VIDEO_MAX_FRAME;
 197         return 0;
 198 }
 199
 200 int saa7134_vbi_fini(struct saa7134_dev *dev)
 201 {
 202         /* nothing */
 203         return 0;
 204 }
 205
 206 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 207 {
 208         spin_lock(&dev->slock);
 209         if (dev->vbi_q.curr) {
 210                 /* make sure we have seen both fields */
 211                 if ((status & 0x10) == 0x00) {
 212                         dev->vbi_q.curr->top_seen = 1;
 213                         goto done;
 214                 }
 215                 if (!dev->vbi_q.curr->top_seen)
 216                         goto done;
 217
 218                 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
 219         }
 220         saa7134_buffer_next(dev, &dev->vbi_q);
 221
 222  done:
 223         spin_unlock(&dev->slock);
 224 }