1 /*
2 * $Id: saa7134-vbi.c,v 1.5 2004/11/07 13:17:15 kraxel Exp $
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 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 */
23
24 #include <linux/init.h>
25 #include <linux/list.h>
26 #include <linux/module.h>
27 #include <linux/kernel.h>
28 #include <linux/slab.h>
29
30 #include "saa7134-reg.h"
31 #include "saa7134.h"
32
33 /* ------------------------------------------------------------------ */
34
35 static unsigned int vbi_debug = 0;
36 module_param(vbi_debug, int, 0644);
37 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
38
39 static unsigned int vbibufs = 4;
40 module_param(vbibufs, int, 0444);
41 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
42
43 #define dprintk(fmt, arg...) if (vbi_debug) \
44 printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
45
46 /* ------------------------------------------------------------------ */
47
48 #define VBI_LINE_COUNT 16
49 #define VBI_LINE_LENGTH 2048
50 #define VBI_SCALE 0x200
51
52 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
53 int task)
54 {
55 struct saa7134_tvnorm *norm = dev->tvnorm;
56
57 /* setup video scaler */
58 saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff);
59 saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8);
60 saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff);
61 saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8);
62 saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start & 0xff);
63 saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start >> 8);
64 saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop & 0xff);
65 saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop >> 8);
66
67 saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff);
68 saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8);
69 saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00);
70 saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
71
72 saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width & 0xff);
73 saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8);
74 saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff);
75 saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 8);
76
77 saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
78 }
79
80 /* ------------------------------------------------------------------ */
81
82 static int buffer_activate(struct saa7134_dev *dev,
83 struct saa7134_buf *buf,
84 struct saa7134_buf *next)
85 {
86 unsigned long control,base;
87
88 dprintk("buffer_activate [%p]\n",buf);
89 buf->vb.state = STATE_ACTIVE;
90 buf->top_seen = 0;
91
92 task_init(dev,buf,TASK_A);
93 task_init(dev,buf,TASK_B);
94 saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
95 saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
96
97 /* DMA: setup channel 2+3 (= VBI Task A+B) */
98 base = saa7134_buffer_base(buf);
99 control = SAA7134_RS_CONTROL_BURST_16 |
100 SAA7134_RS_CONTROL_ME |
101 (buf->pt->dma >> 12);
102 saa_writel(SAA7134_RS_BA1(2),base);
103 saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
104 saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
105 saa_writel(SAA7134_RS_CONTROL(2),control);
106 saa_writel(SAA7134_RS_BA1(3),base);
107 saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
108 saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
109 saa_writel(SAA7134_RS_CONTROL(3),control);
110
111 /* start DMA */
112 saa7134_set_dmabits(dev);
113 mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
114
115 return 0;
116 }
117
118 static int buffer_prepare(struct videobuf_queue *q,
119 struct videobuf_buffer *vb,
120 enum v4l2_field field)
121 {
122 struct saa7134_fh *fh = q->priv_data;
123 struct saa7134_dev *dev = fh->dev;
124 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
125 struct saa7134_tvnorm *norm = dev->tvnorm;
126 unsigned int lines, llength, size;
127 int err;
128
129 lines = norm->vbi_v_stop - norm->vbi_v_start +1;
130 if (lines > VBI_LINE_COUNT)
131 lines = VBI_LINE_COUNT;
132 #if 1
133 llength = VBI_LINE_LENGTH;
134 #else
135 llength = (norm->h_stop - norm->h_start +1) * 2;
136 if (llength > VBI_LINE_LENGTH)
137 llength = VBI_LINE_LENGTH;
138 #endif
139 size = lines * llength * 2;
140 if (0 != buf->vb.baddr && buf->vb.bsize < size)
141 return -EINVAL;
142
143 if (buf->vb.size != size)
144 saa7134_dma_free(dev,buf);
145
146 if (STATE_NEEDS_INIT == buf->vb.state) {
147 buf->vb.width = llength;
148 buf->vb.height = lines;
149 buf->vb.size = size;
150 buf->pt = &fh->pt_vbi;
151
152 err = videobuf_iolock(dev->pci,&buf->vb,NULL);
153 if (err)
154 goto oops;
155 err = saa7134_pgtable_build(dev->pci,buf->pt,
156 buf->vb.dma.sglist,
157 buf->vb.dma.sglen,
158 saa7134_buffer_startpage(buf));
159 if (err)
160 goto oops;
161 }
162 buf->vb.state = STATE_PREPARED;
163 buf->activate = buffer_activate;
164 buf->vb.field = field;
165 return 0;
166
167 oops:
168 saa7134_dma_free(dev,buf);
169 return err;
170 }
171
172 static int
173 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
174 {
175 struct saa7134_fh *fh = q->priv_data;
176 struct saa7134_dev *dev = fh->dev;
177 int llength,lines;
178
179 lines = dev->tvnorm->vbi_v_stop - dev->tvnorm->vbi_v_start +1;
180 #if 1
181 llength = VBI_LINE_LENGTH;
182 #else
183 llength = (norm->h_stop - norm->h_start +1) * 2;
184 if (llength > VBI_LINE_LENGTH)
185 llength = VBI_LINE_LENGTH;
186 #endif
187 *size = lines * llength * 2;
188 if (0 == *count)
189 *count = vbibufs;
190 *count = saa7134_buffer_count(*size,*count);
191 return 0;
192 }
193
194 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
195 {
196 struct saa7134_fh *fh = q->priv_data;
197 struct saa7134_dev *dev = fh->dev;
198 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
199
200 saa7134_buffer_queue(dev,&dev->vbi_q,buf);
201 }
202
203 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
204 {
205 struct saa7134_fh *fh = q->priv_data;
206 struct saa7134_dev *dev = fh->dev;
207 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
208
209 saa7134_dma_free(dev,buf);
210 }
211
212 struct videobuf_queue_ops saa7134_vbi_qops = {
213 .buf_setup = buffer_setup,
214 .buf_prepare = buffer_prepare,
215 .buf_queue = buffer_queue,
216 .buf_release = buffer_release,
217 };
218
219 /* ------------------------------------------------------------------ */
220
221 int saa7134_vbi_init1(struct saa7134_dev *dev)
222 {
223 INIT_LIST_HEAD(&dev->vbi_q.queue);
224 init_timer(&dev->vbi_q.timeout);
225 dev->vbi_q.timeout.function = saa7134_buffer_timeout;
226 dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q);
227 dev->vbi_q.dev = dev;
228
229 if (vbibufs < 2)
230 vbibufs = 2;
231 if (vbibufs > VIDEO_MAX_FRAME)
232 vbibufs = VIDEO_MAX_FRAME;
233 return 0;
234 }
235
236 int saa7134_vbi_fini(struct saa7134_dev *dev)
237 {
238 /* nothing */
239 return 0;
240 }
241
242 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
243 {
244 spin_lock(&dev->slock);
245 if (dev->vbi_q.curr) {
246 dev->vbi_fieldcount++;
247 /* make sure we have seen both fields */
248 if ((status & 0x10) == 0x00) {
249 dev->vbi_q.curr->top_seen = 1;
250 goto done;
251 }
252 if (!dev->vbi_q.curr->top_seen)
253 goto done;
254
255 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
256 saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
257 }
258 saa7134_buffer_next(dev,&dev->vbi_q);
259
260 done:
261 spin_unlock(&dev->slock);
262 }
263
264 /* ----------------------------------------------------------- */
265 /*
266 * Local variables:
267 * c-basic-offset: 8
268 * End:
269 */
270
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