2 * device driver for philips saa7134 based TV cards
3 * video4linux video interface
5 * (c) 2001,02 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/slab.h>
28 #include "saa7134-reg.h"
31 /* ------------------------------------------------------------------ */
33 static unsigned int vbi_debug = 0;
34 MODULE_PARM(vbi_debug,"i");
35 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
37 static unsigned int vbibufs = 4;
38 MODULE_PARM(vbibufs,"i");
39 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
41 #define dprintk(fmt, arg...) if (vbi_debug) \
42 printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
44 /* ------------------------------------------------------------------ */
46 #define VBI_LINE_COUNT 16
47 #define VBI_LINE_LENGTH 2048
48 #define VBI_SCALE 0x200
50 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
53 struct saa7134_tvnorm *norm = dev->tvnorm;
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 & 0xff);
61 saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start >> 8);
62 saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop & 0xff);
63 saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop >> 8);
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);
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);
75 saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
78 /* ------------------------------------------------------------------ */
80 static int buffer_activate(struct saa7134_dev *dev,
81 struct saa7134_buf *buf,
82 struct saa7134_buf *next)
84 unsigned long control,base;
86 dprintk("buffer_activate [%p]\n",buf);
87 buf->vb.state = STATE_ACTIVE;
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);
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 |
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);
110 saa7134_set_dmabits(dev);
111 mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
116 static int buffer_prepare(struct file *file, struct videobuf_buffer *vb,
117 enum v4l2_field field)
119 struct saa7134_fh *fh = file->private_data;
120 struct saa7134_dev *dev = fh->dev;
121 struct saa7134_buf *buf = (struct saa7134_buf *)vb;
122 struct saa7134_tvnorm *norm = dev->tvnorm;
123 unsigned int lines, llength, size;
126 lines = norm->vbi_v_stop - norm->vbi_v_start +1;
127 if (lines > VBI_LINE_COUNT)
128 lines = VBI_LINE_COUNT;
130 llength = VBI_LINE_LENGTH;
132 llength = (norm->h_stop - norm->h_start +1) * 2;
133 if (llength > VBI_LINE_LENGTH)
134 llength = VBI_LINE_LENGTH;
136 size = lines * llength * 2;
137 if (0 != buf->vb.baddr && buf->vb.bsize < size)
140 if (buf->vb.size != size)
141 saa7134_dma_free(dev,buf);
143 if (STATE_NEEDS_INIT == buf->vb.state) {
144 buf->vb.width = llength;
145 buf->vb.height = lines;
147 buf->pt = &fh->pt_vbi;
149 err = videobuf_iolock(dev->pci,&buf->vb,NULL);
152 err = saa7134_pgtable_build(dev->pci,buf->pt,
155 saa7134_buffer_startpage(buf));
159 buf->vb.state = STATE_PREPARED;
160 buf->activate = buffer_activate;
161 buf->vb.field = field;
165 saa7134_dma_free(dev,buf);
170 buffer_setup(struct file *file, unsigned int *count, unsigned int *size)
172 struct saa7134_fh *fh = file->private_data;
173 struct saa7134_dev *dev = fh->dev;
176 lines = dev->tvnorm->vbi_v_stop - dev->tvnorm->vbi_v_start +1;
178 llength = VBI_LINE_LENGTH;
180 llength = (norm->h_stop - norm->h_start +1) * 2;
181 if (llength > VBI_LINE_LENGTH)
182 llength = VBI_LINE_LENGTH;
184 *size = lines * llength * 2;
187 *count = saa7134_buffer_count(*size,*count);
191 static void buffer_queue(struct file *file, struct videobuf_buffer *vb)
193 struct saa7134_fh *fh = file->private_data;
194 struct saa7134_dev *dev = fh->dev;
195 struct saa7134_buf *buf = (struct saa7134_buf *)vb;
197 saa7134_buffer_queue(dev,&dev->vbi_q,buf);
200 static void buffer_release(struct file *file, struct videobuf_buffer *vb)
202 struct saa7134_fh *fh = file->private_data;
203 struct saa7134_dev *dev = fh->dev;
204 struct saa7134_buf *buf = (struct saa7134_buf *)vb;
206 saa7134_dma_free(dev,buf);
209 struct videobuf_queue_ops saa7134_vbi_qops = {
210 .buf_setup = buffer_setup,
211 .buf_prepare = buffer_prepare,
212 .buf_queue = buffer_queue,
213 .buf_release = buffer_release,
216 /* ------------------------------------------------------------------ */
218 int saa7134_vbi_init1(struct saa7134_dev *dev)
220 INIT_LIST_HEAD(&dev->vbi_q.queue);
221 init_timer(&dev->vbi_q.timeout);
222 dev->vbi_q.timeout.function = saa7134_buffer_timeout;
223 dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q);
224 dev->vbi_q.dev = dev;
228 if (vbibufs > VIDEO_MAX_FRAME)
229 vbibufs = VIDEO_MAX_FRAME;
233 int saa7134_vbi_fini(struct saa7134_dev *dev)
239 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
241 spin_lock(&dev->slock);
242 if (dev->vbi_q.curr) {
243 dev->vbi_fieldcount++;
244 /* make sure we have seen both fields */
245 if ((status & 0x10) == 0x00) {
246 dev->vbi_q.curr->top_seen = 1;
249 if (!dev->vbi_q.curr->top_seen)
252 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
253 saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE);
255 saa7134_buffer_next(dev,&dev->vbi_q);
258 spin_unlock(&dev->slock);
261 /* ----------------------------------------------------------- */