cx88-vbi.c

  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	return cx88_risc_buffer(dev->pci, &buf->risc, sgt->sgl,
148				0, VBI_LINE_LENGTH * lines,
149				VBI_LINE_LENGTH, 0,
150				lines);
151}
152
153static void buffer_finish(struct vb2_buffer *vb)
154{
155	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
156	struct cx8800_dev *dev = vb->vb2_queue->drv_priv;
157	struct cx88_buffer *buf = container_of(vbuf, struct cx88_buffer, vb);
158	struct cx88_riscmem *risc = &buf->risc;
159
160	if (risc->cpu)
161		dma_free_coherent(&dev->pci->dev, risc->size, risc->cpu,
162				  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	.start_streaming = start_streaming,
232	.stop_streaming = stop_streaming,
233};