aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/saa7134/saa7134-vbi.c
blob: 5306e549e5261e935d571bf185c60e848cdad577 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
 *
 * device driver for philips saa7134 based TV cards
 * video4linux video interface
 *
 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/init.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/kernel.h>

#include "saa7134-reg.h"
#include "saa7134.h"

/* ------------------------------------------------------------------ */

static unsigned int vbi_debug;
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");

static unsigned int vbibufs = 4;
module_param(vbibufs, int, 0444);
MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");

#define dprintk(fmt, arg...)	if (vbi_debug) \
	printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)

/* ------------------------------------------------------------------ */

#define VBI_LINE_COUNT     17
#define VBI_LINE_LENGTH  2048
#define VBI_SCALE       0x200

static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
		      int task)
{
	struct saa7134_tvnorm *norm = dev->tvnorm;

	/* setup video scaler */
	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);

	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);

	saa_writeb(SAA7134_VBI_H_LEN1(task), dev->vbi_hlen & 0xff);
	saa_writeb(SAA7134_VBI_H_LEN2(task), dev->vbi_hlen >> 8);
	saa_writeb(SAA7134_VBI_V_LEN1(task), dev->vbi_vlen & 0xff);
	saa_writeb(SAA7134_VBI_V_LEN2(task), dev->vbi_vlen >> 8);

	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
}

/* ------------------------------------------------------------------ */

static int buffer_activate(struct saa7134_dev *dev,
			   struct saa7134_buf *buf,
			   struct saa7134_buf *next)
{
	struct saa7134_dmaqueue *dmaq = buf->vb2.vb2_queue->drv_priv;
	unsigned long control, base;

	dprintk("buffer_activate [%p]\n", buf);
	buf->top_seen = 0;

	task_init(dev, buf, TASK_A);
	task_init(dev, buf, TASK_B);
	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);

	/* DMA: setup channel 2+3 (= VBI Task A+B) */
	base    = saa7134_buffer_base(buf);
	control = SAA7134_RS_CONTROL_BURST_16 |
		SAA7134_RS_CONTROL_ME |
		(dmaq->pt.dma >> 12);
	saa_writel(SAA7134_RS_BA1(2), base);
	saa_writel(SAA7134_RS_BA2(2), base + dev->vbi_hlen * dev->vbi_vlen);
	saa_writel(SAA7134_RS_PITCH(2), dev->vbi_hlen);
	saa_writel(SAA7134_RS_CONTROL(2), control);
	saa_writel(SAA7134_RS_BA1(3), base);
	saa_writel(SAA7134_RS_BA2(3), base + dev->vbi_hlen * dev->vbi_vlen);
	saa_writel(SAA7134_RS_PITCH(3), dev->vbi_hlen);
	saa_writel(SAA7134_RS_CONTROL(3), control);

	/* start DMA */
	saa7134_set_dmabits(dev);
	mod_timer(&dmaq->timeout, jiffies + BUFFER_TIMEOUT);

	return 0;
}

static int buffer_prepare(struct vb2_buffer *vb2)
{
	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
	struct saa7134_dev *dev = dmaq->dev;
	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);
	struct sg_table *dma = vb2_dma_sg_plane_desc(&buf->vb2, 0);
	unsigned int size;

	if (dma->sgl->offset) {
		pr_err("The buffer is not page-aligned\n");
		return -EINVAL;
	}
	size = dev->vbi_hlen * dev->vbi_vlen * 2;
	if (vb2_plane_size(vb2, 0) < size)
		return -EINVAL;

	vb2_set_plane_payload(vb2, 0, size);

	return saa7134_pgtable_build(dev->pci, &dmaq->pt, dma->sgl, dma->nents,
				    saa7134_buffer_startpage(buf));
}

static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
			   unsigned int *nbuffers, unsigned int *nplanes,
			   unsigned int sizes[], void *alloc_ctxs[])
{
	struct saa7134_dmaqueue *dmaq = q->drv_priv;
	struct saa7134_dev *dev = dmaq->dev;
	unsigned int size;

	dev->vbi_vlen = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 + 1;
	if (dev->vbi_vlen > VBI_LINE_COUNT)
		dev->vbi_vlen = VBI_LINE_COUNT;
	dev->vbi_hlen = VBI_LINE_LENGTH;
	size = dev->vbi_hlen * dev->vbi_vlen * 2;

	*nbuffers = saa7134_buffer_count(size, *nbuffers);
	*nplanes = 1;
	sizes[0] = size;
	alloc_ctxs[0] = dev->alloc_ctx;
	return 0;
}

static int buffer_init(struct vb2_buffer *vb2)
{
	struct saa7134_dmaqueue *dmaq = vb2->vb2_queue->drv_priv;
	struct saa7134_buf *buf = container_of(vb2, struct saa7134_buf, vb2);

	dmaq->curr = NULL;
	buf->activate = buffer_activate;
	return 0;
}

struct vb2_ops saa7134_vbi_qops = {
	.queue_setup	= queue_setup,
	.buf_init	= buffer_init,
	.buf_prepare	= buffer_prepare,
	.buf_queue	= saa7134_vb2_buffer_queue,
	.wait_prepare	= vb2_ops_wait_prepare,
	.wait_finish	= vb2_ops_wait_finish,
	.start_streaming = saa7134_vb2_start_streaming,
	.stop_streaming = saa7134_vb2_stop_streaming,
};

/* ------------------------------------------------------------------ */

int saa7134_vbi_init1(struct saa7134_dev *dev)
{
	INIT_LIST_HEAD(&dev->vbi_q.queue);
	init_timer(&dev->vbi_q.timeout);
	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
	dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
	dev->vbi_q.dev              = dev;

	if (vbibufs < 2)
		vbibufs = 2;
	if (vbibufs > VIDEO_MAX_FRAME)
		vbibufs = VIDEO_MAX_FRAME;
	return 0;
}

int saa7134_vbi_fini(struct saa7134_dev *dev)
{
	/* nothing */
	return 0;
}

void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
{
	spin_lock(&dev->slock);
	if (dev->vbi_q.curr) {
		/* make sure we have seen both fields */
		if ((status & 0x10) == 0x00) {
			dev->vbi_q.curr->top_seen = 1;
			goto done;
		}
		if (!dev->vbi_q.curr->top_seen)
			goto done;

		saa7134_buffer_finish(dev, &dev->vbi_q, VB2_BUF_STATE_DONE);
	}
	saa7134_buffer_next(dev, &dev->vbi_q);

 done:
	spin_unlock(&dev->slock);
}

Privacy Policy