linux/drivers/media/pci/cx88/cx88-vbi.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 */
   4
   5#include "cx88.h"
   6
   7#include <linux/kernel.h>
   8#include <linux/module.h>
   9#include <linux/init.h>
  10
  11static unsigned int vbi_debug;
  12module_param(vbi_debug, int, 0644);
  13MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
  14
  15#define dprintk(level, fmt, arg...) do {                        \
  16        if (vbi_debug >= level)                                 \
  17                printk(KERN_DEBUG pr_fmt("%s: vbi:" fmt),       \
  18                        __func__, ##arg);                       \
  19} while (0)
  20
  21/* ------------------------------------------------------------------ */
  22
  23int cx8800_vbi_fmt(struct file *file, void *priv,
  24                   struct v4l2_format *f)
  25{
  26        struct cx8800_dev *dev = video_drvdata(file);
  27
  28        f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
  29        f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
  30        f->fmt.vbi.offset = 244;
  31
  32        if (dev->core->tvnorm & V4L2_STD_525_60) {
  33                /* ntsc */
  34                f->fmt.vbi.sampling_rate = 28636363;
  35                f->fmt.vbi.start[0] = 10;
  36                f->fmt.vbi.start[1] = 273;
  37                f->fmt.vbi.count[0] = VBI_LINE_NTSC_COUNT;
  38                f->fmt.vbi.count[1] = VBI_LINE_NTSC_COUNT;
  39
  40        } else if (dev->core->tvnorm & V4L2_STD_625_50) {
  41                /* pal */
  42                f->fmt.vbi.sampling_rate = 35468950;
  43                f->fmt.vbi.start[0] = V4L2_VBI_ITU_625_F1_START + 5;
  44                f->fmt.vbi.start[1] = V4L2_VBI_ITU_625_F2_START + 5;
  45                f->fmt.vbi.count[0] = VBI_LINE_PAL_COUNT;
  46                f->fmt.vbi.count[1] = VBI_LINE_PAL_COUNT;
  47        }
  48        return 0;
  49}
  50
  51static int cx8800_start_vbi_dma(struct cx8800_dev    *dev,
  52                                struct cx88_dmaqueue *q,
  53                                struct cx88_buffer   *buf)
  54{
  55        struct cx88_core *core = dev->core;
  56
  57        /* setup fifo + format */
  58        cx88_sram_channel_setup(dev->core, &cx88_sram_channels[SRAM_CH24],
  59                                VBI_LINE_LENGTH, buf->risc.dma);
  60
  61        cx_write(MO_VBOS_CONTROL, (1 << 18) |  /* comb filter delay fixup */
  62                                  (1 << 15) |  /* enable vbi capture */
  63                                  (1 << 11));
  64
  65        /* reset counter */
  66        cx_write(MO_VBI_GPCNTRL, GP_COUNT_CONTROL_RESET);
  67        q->count = 0;
  68
  69        /* enable irqs */
  70        cx_set(MO_PCI_INTMSK, core->pci_irqmask | PCI_INT_VIDINT);
  71        cx_set(MO_VID_INTMSK, 0x0f0088);
  72
  73        /* enable capture */
  74        cx_set(VID_CAPTURE_CONTROL, 0x18);
  75
  76        /* start dma */
  77        cx_set(MO_DEV_CNTRL2, (1 << 5));
  78        cx_set(MO_VID_DMACNTRL, 0x88);
  79
  80        return 0;
  81}
  82
  83void cx8800_stop_vbi_dma(struct cx8800_dev *dev)
  84{
  85        struct cx88_core *core = dev->core;
  86
  87        /* stop dma */
  88        cx_clear(MO_VID_DMACNTRL, 0x88);
  89
  90        /* disable capture */
  91        cx_clear(VID_CAPTURE_CONTROL, 0x18);
  92
  93        /* disable irqs */
  94        cx_clear(MO_PCI_INTMSK, PCI_INT_VIDINT);
  95        cx_clear(MO_VID_INTMSK, 0x0f0088);
  96}
  97
  98int cx8800_restart_vbi_queue(struct cx8800_dev    *dev,
  99                             struct cx88_dmaqueue *q)
 100{
 101        struct cx88_buffer *buf;
 102
 103        if (list_empty(&q->active))
 104                return 0;
 105
 106        buf = list_entry(q->active.next, struct cx88_buffer, list);
 107        dprintk(2, "restart_queue [%p/%d]: restart dma\n",
 108                buf, buf->vb.vb2_buf.index);
 109        cx8800_start_vbi_dma(dev, q, buf);
 110        return 0;
 111}
 112
 113/* ------------------------------------------------------------------ */
 114
 115static int queue_setup(struct vb2_queue *q,
 116                       unsigned int *num_buffers, unsigned int *num_planes,
 117                       unsigned int sizes[], struct device *alloc_devs[])
 118{
 119        struct cx8800_dev *dev = q->drv_priv;
 120
 121        *num_planes = 1;
 122        if (dev->core->tvnorm & V4L2_STD_525_60)
 123                sizes[0] = VBI_LINE_NTSC_COUNT * VBI_LINE_LENGTH * 2;
 124        else
 125                sizes[0] = VBI_LINE_PAL_COUNT * VBI_LINE_LENGTH * 2;
 126        return 0;
 127}
 128
 129static int buffer_prepare(struct vb2_buffer *vb)
 130{
 131        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 132        struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
 133        struct cx88_buffer *buf = container_of(vbuf, struct cx88_buffer, vb);
 134        struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
 135        unsigned int lines;
 136        unsigned int size;
 137
 138        if (dev->core->tvnorm & V4L2_STD_525_60)
 139                lines = VBI_LINE_NTSC_COUNT;
 140        else
 141                lines = VBI_LINE_PAL_COUNT;
 142        size = lines * VBI_LINE_LENGTH * 2;
 143        if (vb2_plane_size(vb, 0) < size)
 144                return -EINVAL;
 145        vb2_set_plane_payload(vb, 0, size);
 146
 147        cx88_risc_buffer(dev->pci, &buf->risc, sgt->sgl,
 148                         0, VBI_LINE_LENGTH * lines,
 149                         VBI_LINE_LENGTH, 0,
 150                         lines);
 151        return 0;
 152}
 153
 154static void buffer_finish(struct vb2_buffer *vb)
 155{
 156        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 157        struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
 158        struct cx88_buffer *buf = container_of(vbuf, struct cx88_buffer, vb);
 159        struct cx88_riscmem *risc = &buf->risc;
 160
 161        if (risc->cpu)
 162                pci_free_consistent(dev->pci, risc->size, risc->cpu, risc->dma);
 163        memset(risc, 0, sizeof(*risc));
 164}
 165
 166static void buffer_queue(struct vb2_buffer *vb)
 167{
 168        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
 169        struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
 170        struct cx88_buffer    *buf = container_of(vbuf, struct cx88_buffer, vb);
 171        struct cx88_buffer    *prev;
 172        struct cx88_dmaqueue  *q    = &dev->vbiq;
 173
 174        /* add jump to start */
 175        buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 8);
 176        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
 177        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 8);
 178
 179        if (list_empty(&q->active)) {
 180                list_add_tail(&buf->list, &q->active);
 181                dprintk(2, "[%p/%d] vbi_queue - first active\n",
 182                        buf, buf->vb.vb2_buf.index);
 183
 184        } else {
 185                buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
 186                prev = list_entry(q->active.prev, struct cx88_buffer, list);
 187                list_add_tail(&buf->list, &q->active);
 188                prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 189                dprintk(2, "[%p/%d] buffer_queue - append to active\n",
 190                        buf, buf->vb.vb2_buf.index);
 191        }
 192}
 193
 194static int start_streaming(struct vb2_queue *q, unsigned int count)
 195{
 196        struct cx8800_dev *dev = q->drv_priv;
 197        struct cx88_dmaqueue *dmaq = &dev->vbiq;
 198        struct cx88_buffer *buf = list_entry(dmaq->active.next,
 199                        struct cx88_buffer, list);
 200
 201        cx8800_start_vbi_dma(dev, dmaq, buf);
 202        return 0;
 203}
 204
 205static void stop_streaming(struct vb2_queue *q)
 206{
 207        struct cx8800_dev *dev = q->drv_priv;
 208        struct cx88_core *core = dev->core;
 209        struct cx88_dmaqueue *dmaq = &dev->vbiq;
 210        unsigned long flags;
 211
 212        cx_clear(MO_VID_DMACNTRL, 0x11);
 213        cx_clear(VID_CAPTURE_CONTROL, 0x06);
 214        cx8800_stop_vbi_dma(dev);
 215        spin_lock_irqsave(&dev->slock, flags);
 216        while (!list_empty(&dmaq->active)) {
 217                struct cx88_buffer *buf = list_entry(dmaq->active.next,
 218                        struct cx88_buffer, list);
 219
 220                list_del(&buf->list);
 221                vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 222        }
 223        spin_unlock_irqrestore(&dev->slock, flags);
 224}
 225
 226const struct vb2_ops cx8800_vbi_qops = {
 227        .queue_setup    = queue_setup,
 228        .buf_prepare  = buffer_prepare,
 229        .buf_finish = buffer_finish,
 230        .buf_queue    = buffer_queue,
 231        .wait_prepare = vb2_ops_wait_prepare,
 232        .wait_finish = vb2_ops_wait_finish,
 233        .start_streaming = start_streaming,
 234        .stop_streaming = stop_streaming,
 235};
 236