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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * device driver for philips saa7134 based TV cards
   5  * video4linux video interface
   6  *
   7  * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
   8  */
   9
  10 #include "saa7134.h"
  11 #include "saa7134-reg.h"
  12
  13 #include <linux/init.h>
  14 #include <linux/list.h>
  15 #include <linux/module.h>
  16 #include <linux/kernel.h>
  17
  18 /* ------------------------------------------------------------------ */
  19
  20 static unsigned int vbi_debug;
  21 module_param(vbi_debug, int, 0644);
  22 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
  23
  24 static unsigned int vbibufs = 4;
  25 module_param(vbibufs, int, 0444);
  26 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
  27
  28 #define vbi_dbg(fmt, arg...) do { \
  29         if (vbi_debug) \
  30                 printk(KERN_DEBUG pr_fmt("vbi: " fmt), ## arg); \
  31         } while (0)
  32
  33 /* ------------------------------------------------------------------ */
  34
  35 #define VBI_LINE_COUNT     17
  36 #define VBI_LINE_LENGTH  2048
  37 #define VBI_SCALE       0x200
  38
  39 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
  40                       int task)
  41 {
  42         struct saa7134_tvnorm *norm = dev->tvnorm;
  43
  44         /* setup video scaler */
  45         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
  46         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
  47         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
  48         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
  49         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
  50         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
  51         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
  52         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
  53
  54         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
  55         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
  56         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
  57         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
  58
  59         saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
  60         saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
  61         saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
  62         saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);
  63
  64         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
  65 }
  66
  67 /* ------------------------------------------------------------------ */
  68
  69 static int buffer_activate(struct saa7134_dev *dev,
  70                            struct saa7134_buf *buf,
  71                            struct saa7134_buf *next)
  72 {
  73         struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_buf.vb2_queue->drv_priv;
  74         unsigned long control, base;
  75
  76         vbi_dbg("buffer_activate [%p]\n", buf);
  77         buf->top_seen = 0;
  78
  79         task_init(dev, buf, TASK_A);
  80         task_init(dev, buf, TASK_B);
  81         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
  82         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
  83
  84         /* DMA: setup channel 2+3 (= VBI Task A+B) */
  85         base    = saa7134_buffer_base(buf);
  86         control = SAA7134_RS_CONTROL_BURST_16 |
  87                 SAA7134_RS_CONTROL_ME |
  88                 (dmaq->pt.dma >> 12);
  89         saa_writel(SAA7134_RS_BA1(2), base);
  90         saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
  91         saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
  92         saa_writel(SAA7134_RS_CONTROL(2), control);
  93         saa_writel(SAA7134_RS_BA1(3), base);
  94         saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
  95         saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
  96         saa_writel(SAA7134_RS_CONTROL(3), control);
  97
  98         /* start DMA */
  99         saa7134_set_dmabits(dev);
 100         mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);
 101
 102         return 0;
 103 }
 104
 105 static int buffer_prepare(struct vb2_buffer *vb2)
 106 {
 107         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 108         struct saa7134_dev *dev = dmaq->dev;
 109         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
 110         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
 111         struct sg_table *dma = vb2_dma_sg_plane_desc(vb2, 0);
 112         unsigned int size;
 113
 114         if (dma->sgl->offset) {
 115                 pr_err("The buffer is not page-aligned\n");
 116                 return -EINVAL;
 117         }
 118         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 119         if (vb2_plane_size(vb2, 0) < size)
 120                 return -EINVAL;
 121
 122         vb2_set_plane_payload(vb2, 0, size);
 123
 124         return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
 125                                     saa7134_buffer_startpage(buf));
 126 }
 127
 128 static int queue_setup(struct vb2_queue *q,
 129                            unsigned int *nbuffers, unsigned int *nplanes,
 130                            unsigned int sizes[], struct device *alloc_devs[])
 131 {
 132         struct saa7134_dmaqueue *dmaq = q->drv_priv;
 133         struct saa7134_dev *dev = dmaq->dev;
 134         unsigned int size;
 135
 136         dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
 137         if (dev->vbi_vlen > VBI_LINE_COUNT)
 138                 dev->vbi_vlen = VBI_LINE_COUNT;
 139         dev->vbi_hlen = VBI_LINE_LENGTH;
 140         size = dev->vbi_hlen * dev->vbi_vlen * 2;
 141
 142         *nbuffers = saa7134_buffer_count(size, *nbuffers);
 143         *nplanes = 1;
 144         sizes[0] = size;
 145         return 0;
 146 }
 147
 148 static int buffer_init(struct vb2_buffer *vb2)
 149 {
 150         struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
 151         struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb2);
 152         struct saa7134_buf *buf = container_of(vbuf, struct saa7134_buf, vb2);
 153
 154         dmaq->curr = NULL;
 155         buf->activate = buffer_activate;
 156         return 0;
 157 }
 158
 159 const struct vb2_ops saa7134_vbi_qops = {
 160         .queue_setup    = queue_setup,
 161         .buf_init       = buffer_init,
 162         .buf_prepare    = buffer_prepare,
 163         .buf_queue      = saa7134_vb2_buffer_queue,
 164         .wait_prepare   = vb2_ops_wait_prepare,
 165         .wait_finish    = vb2_ops_wait_finish,
 166         .start_streaming = saa7134_vb2_start_streaming,
 167         .stop_streaming = saa7134_vb2_stop_streaming,
 168 };
 169
 170 /* ------------------------------------------------------------------ */
 171
 172 int saa7134_vbi_init1(struct saa7134_dev *dev)
 173 {
 174         INIT_LIST_HEAD(&dev->vbi_q.queue);
 175         timer_setup(&dev->vbi_q.timeout, saa7134_buffer_timeout, 0);
 176         dev->vbi_q.dev              = dev;
 177
 178         if (vbibufs < 2)
 179                 vbibufs = 2;
 180         if (vbibufs > VIDEO_MAX_FRAME)
 181                 vbibufs = VIDEO_MAX_FRAME;
 182         return 0;
 183 }
 184
 185 int saa7134_vbi_fini(struct saa7134_dev *dev)
 186 {
 187         /* nothing */
 188         del_timer_sync(&dev->vbi_q.timeout);
 189         return 0;
 190 }
 191
 192 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
 193 {
 194         spin_lock(&dev->slock);
 195         if (dev->vbi_q.curr) {
 196                 /* make sure we have seen both fields */
 197                 if ((status & 0x10) == 0x00) {
 198                         dev->vbi_q.curr->top_seen = 1;
 199                         goto done;
 200                 }
 201                 if (!dev->vbi_q.curr->top_seen)
 202                         goto done;
 203
 204                 saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
 205         }
 206         saa7134_buffer_next(dev, &dev->vbi_q);
 207
 208  done:
 209         spin_unlock(&dev->slock);
 210 }