/drivers/media/video/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 <linux/init.h>
 24#include <linux/list.h>
 25#include <linux/module.h>
 26#include <linux/kernel.h>
 27
 28#include "saa7134-reg.h"
 29#include "saa7134.h"
 30
 31/* ------------------------------------------------------------------ */
 32
 33static unsigned int vbi_debug;
 34module_param(vbi_debug, int, 0644);
 35MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
 36
 37static unsigned int vbibufs = 4;
 38module_param(vbibufs, int, 0444);
 39MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
 40
 41#define dprintk(fmt, arg...)	if (vbi_debug) \
 42	printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
 43
 44/* ------------------------------------------------------------------ */
 45
 46#define VBI_LINE_COUNT     16
 47#define VBI_LINE_LENGTH  2048
 48#define VBI_SCALE       0x200
 49
 50static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
 51		      int task)
 52{
 53	struct saa7134_tvnorm *norm = dev->tvnorm;
 54
 55	/* setup video scaler */
 56	saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
 57	saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
 58	saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
 59	saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
 60	saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
 61	saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
 62	saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
 63	saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
 64
 65	saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
 66	saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
 67	saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
 68	saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
 69
 70	saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width   & 0xff);
 71	saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width   >> 8);
 72	saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height  & 0xff);
 73	saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height  >> 8);
 74
 75	saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
 76}
 77
 78/* ------------------------------------------------------------------ */
 79
 80static int buffer_activate(struct saa7134_dev *dev,
 81			   struct saa7134_buf *buf,
 82			   struct saa7134_buf *next)
 83{
 84	unsigned long control,base;
 85
 86	dprintk("buffer_activate [%p]\n",buf);
 87	buf->vb.state = VIDEOBUF_ACTIVE;
 88	buf->top_seen = 0;
 89
 90	task_init(dev,buf,TASK_A);
 91	task_init(dev,buf,TASK_B);
 92	saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
 93	saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
 94
 95	/* DMA: setup channel 2+3 (= VBI Task A+B) */
 96	base    = saa7134_buffer_base(buf);
 97	control = SAA7134_RS_CONTROL_BURST_16 |
 98		SAA7134_RS_CONTROL_ME |
 99		(buf->pt->dma >> 12);
100	saa_writel(SAA7134_RS_BA1(2),base);
101	saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
102	saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
103	saa_writel(SAA7134_RS_CONTROL(2),control);
104	saa_writel(SAA7134_RS_BA1(3),base);
105	saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
106	saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
107	saa_writel(SAA7134_RS_CONTROL(3),control);
108
109	/* start DMA */
110	saa7134_set_dmabits(dev);
111	mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
112
113	return 0;
114}
115
116static int buffer_prepare(struct videobuf_queue *q,
117			  struct videobuf_buffer *vb,
118			  enum v4l2_field field)
119{
120	struct saa7134_fh *fh   = q->priv_data;
121	struct saa7134_dev *dev = fh->dev;
122	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
123	struct saa7134_tvnorm *norm = dev->tvnorm;
124	unsigned int lines, llength, size;
125	int err;
126
127	lines   = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
128	if (lines > VBI_LINE_COUNT)
129		lines = VBI_LINE_COUNT;
130	llength = VBI_LINE_LENGTH;
131	size = lines * llength * 2;
132	if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
133		return -EINVAL;
134
135	if (buf->vb.size != size)
136		saa7134_dma_free(q,buf);
137
138	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
139		struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
140
141		buf->vb.width  = llength;
142		buf->vb.height = lines;
143		buf->vb.size   = size;
144		buf->pt        = &fh->pt_vbi;
145
146		err = videobuf_iolock(q,&buf->vb,NULL);
147		if (err)
148			goto oops;
149		err = saa7134_pgtable_build(dev->pci,buf->pt,
150					    dma->sglist,
151					    dma->sglen,
152					    saa7134_buffer_startpage(buf));
153		if (err)
154			goto oops;
155	}
156	buf->vb.state = VIDEOBUF_PREPARED;
157	buf->activate = buffer_activate;
158	buf->vb.field = field;
159	return 0;
160
161 oops:
162	saa7134_dma_free(q,buf);
163	return err;
164}
165
166static int
167buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
168{
169	struct saa7134_fh *fh   = q->priv_data;
170	struct saa7134_dev *dev = fh->dev;
171	int llength,lines;
172
173	lines   = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
174	llength = VBI_LINE_LENGTH;
175	*size = lines * llength * 2;
176	if (0 == *count)
177		*count = vbibufs;
178	*count = saa7134_buffer_count(*size,*count);
179	return 0;
180}
181
182static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
183{
184	struct saa7134_fh *fh = q->priv_data;
185	struct saa7134_dev *dev = fh->dev;
186	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
187
188	saa7134_buffer_queue(dev,&dev->vbi_q,buf);
189}
190
191static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
192{
193	struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
194
195	saa7134_dma_free(q,buf);
196}
197
198struct videobuf_queue_ops saa7134_vbi_qops = {
199	.buf_setup    = buffer_setup,
200	.buf_prepare  = buffer_prepare,
201	.buf_queue    = buffer_queue,
202	.buf_release  = buffer_release,
203};
204
205/* ------------------------------------------------------------------ */
206
207int saa7134_vbi_init1(struct saa7134_dev *dev)
208{
209	INIT_LIST_HEAD(&dev->vbi_q.queue);
210	init_timer(&dev->vbi_q.timeout);
211	dev->vbi_q.timeout.function = saa7134_buffer_timeout;
212	dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
213	dev->vbi_q.dev              = dev;
214
215	if (vbibufs < 2)
216		vbibufs = 2;
217	if (vbibufs > VIDEO_MAX_FRAME)
218		vbibufs = VIDEO_MAX_FRAME;
219	return 0;
220}
221
222int saa7134_vbi_fini(struct saa7134_dev *dev)
223{
224	/* nothing */
225	return 0;
226}
227
228void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
229{
230	spin_lock(&dev->slock);
231	if (dev->vbi_q.curr) {
232		dev->vbi_fieldcount++;
233		/* make sure we have seen both fields */
234		if ((status & 0x10) == 0x00) {
235			dev->vbi_q.curr->top_seen = 1;
236			goto done;
237		}
238		if (!dev->vbi_q.curr->top_seen)
239			goto done;
240
241		dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
242		saa7134_buffer_finish(dev,&dev->vbi_q,VIDEOBUF_DONE);
243	}
244	saa7134_buffer_next(dev,&dev->vbi_q);
245
246 done:
247	spin_unlock(&dev->slock);
248}
249
250/* ----------------------------------------------------------- */
251/*
252 * Local variables:
253 * c-basic-offset: 8
254 * End:
255 */