V4L/DVB (8489): add dvb-t support for terratec cinergy hybrid T usb xs
[linux-2.6] / 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 #include <linux/slab.h>
28
29 #include "saa7134-reg.h"
30 #include "saa7134.h"
31
32 /* ------------------------------------------------------------------ */
33
34 static unsigned int vbi_debug;
35 module_param(vbi_debug, int, 0644);
36 MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]");
37
38 static unsigned int vbibufs = 4;
39 module_param(vbibufs, int, 0444);
40 MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32");
41
42 #define dprintk(fmt, arg...)    if (vbi_debug) \
43         printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg)
44
45 /* ------------------------------------------------------------------ */
46
47 #define VBI_LINE_COUNT     16
48 #define VBI_LINE_LENGTH  2048
49 #define VBI_SCALE       0x200
50
51 static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf,
52                       int task)
53 {
54         struct saa7134_tvnorm *norm = dev->tvnorm;
55
56         /* setup video scaler */
57         saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start     &  0xff);
58         saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start     >> 8);
59         saa_writeb(SAA7134_VBI_H_STOP1(task),  norm->h_stop      &  0xff);
60         saa_writeb(SAA7134_VBI_H_STOP2(task),  norm->h_stop      >> 8);
61         saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start_0 &  0xff);
62         saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start_0 >> 8);
63         saa_writeb(SAA7134_VBI_V_STOP1(task),  norm->vbi_v_stop_0  &  0xff);
64         saa_writeb(SAA7134_VBI_V_STOP2(task),  norm->vbi_v_stop_0  >> 8);
65
66         saa_writeb(SAA7134_VBI_H_SCALE_INC1(task),        VBI_SCALE & 0xff);
67         saa_writeb(SAA7134_VBI_H_SCALE_INC2(task),        VBI_SCALE >> 8);
68         saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task),   0x00);
69         saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00);
70
71         saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width   & 0xff);
72         saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width   >> 8);
73         saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height  & 0xff);
74         saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height  >> 8);
75
76         saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00);
77 }
78
79 /* ------------------------------------------------------------------ */
80
81 static int buffer_activate(struct saa7134_dev *dev,
82                            struct saa7134_buf *buf,
83                            struct saa7134_buf *next)
84 {
85         unsigned long control,base;
86
87         dprintk("buffer_activate [%p]\n",buf);
88         buf->vb.state = VIDEOBUF_ACTIVE;
89         buf->top_seen = 0;
90
91         task_init(dev,buf,TASK_A);
92         task_init(dev,buf,TASK_B);
93         saa_writeb(SAA7134_OFMT_DATA_A, 0x06);
94         saa_writeb(SAA7134_OFMT_DATA_B, 0x06);
95
96         /* DMA: setup channel 2+3 (= VBI Task A+B) */
97         base    = saa7134_buffer_base(buf);
98         control = SAA7134_RS_CONTROL_BURST_16 |
99                 SAA7134_RS_CONTROL_ME |
100                 (buf->pt->dma >> 12);
101         saa_writel(SAA7134_RS_BA1(2),base);
102         saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2);
103         saa_writel(SAA7134_RS_PITCH(2),buf->vb.width);
104         saa_writel(SAA7134_RS_CONTROL(2),control);
105         saa_writel(SAA7134_RS_BA1(3),base);
106         saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2);
107         saa_writel(SAA7134_RS_PITCH(3),buf->vb.width);
108         saa_writel(SAA7134_RS_CONTROL(3),control);
109
110         /* start DMA */
111         saa7134_set_dmabits(dev);
112         mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT);
113
114         return 0;
115 }
116
117 static int buffer_prepare(struct videobuf_queue *q,
118                           struct videobuf_buffer *vb,
119                           enum v4l2_field field)
120 {
121         struct saa7134_fh *fh   = q->priv_data;
122         struct saa7134_dev *dev = fh->dev;
123         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
124         struct saa7134_tvnorm *norm = dev->tvnorm;
125         unsigned int lines, llength, size;
126         int err;
127
128         lines   = norm->vbi_v_stop_0 - norm->vbi_v_start_0 +1;
129         if (lines > VBI_LINE_COUNT)
130                 lines = VBI_LINE_COUNT;
131         llength = VBI_LINE_LENGTH;
132         size = lines * llength * 2;
133         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
134                 return -EINVAL;
135
136         if (buf->vb.size != size)
137                 saa7134_dma_free(q,buf);
138
139         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
140                 struct videobuf_dmabuf *dma=videobuf_to_dma(&buf->vb);
141
142                 buf->vb.width  = llength;
143                 buf->vb.height = lines;
144                 buf->vb.size   = size;
145                 buf->pt        = &fh->pt_vbi;
146
147                 err = videobuf_iolock(q,&buf->vb,NULL);
148                 if (err)
149                         goto oops;
150                 err = saa7134_pgtable_build(dev->pci,buf->pt,
151                                             dma->sglist,
152                                             dma->sglen,
153                                             saa7134_buffer_startpage(buf));
154                 if (err)
155                         goto oops;
156         }
157         buf->vb.state = VIDEOBUF_PREPARED;
158         buf->activate = buffer_activate;
159         buf->vb.field = field;
160         return 0;
161
162  oops:
163         saa7134_dma_free(q,buf);
164         return err;
165 }
166
167 static int
168 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
169 {
170         struct saa7134_fh *fh   = q->priv_data;
171         struct saa7134_dev *dev = fh->dev;
172         int llength,lines;
173
174         lines   = dev->tvnorm->vbi_v_stop_0 - dev->tvnorm->vbi_v_start_0 +1;
175         llength = VBI_LINE_LENGTH;
176         *size = lines * llength * 2;
177         if (0 == *count)
178                 *count = vbibufs;
179         *count = saa7134_buffer_count(*size,*count);
180         return 0;
181 }
182
183 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
184 {
185         struct saa7134_fh *fh = q->priv_data;
186         struct saa7134_dev *dev = fh->dev;
187         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
188
189         saa7134_buffer_queue(dev,&dev->vbi_q,buf);
190 }
191
192 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
193 {
194         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
195
196         saa7134_dma_free(q,buf);
197 }
198
199 struct videobuf_queue_ops saa7134_vbi_qops = {
200         .buf_setup    = buffer_setup,
201         .buf_prepare  = buffer_prepare,
202         .buf_queue    = buffer_queue,
203         .buf_release  = buffer_release,
204 };
205
206 /* ------------------------------------------------------------------ */
207
208 int saa7134_vbi_init1(struct saa7134_dev *dev)
209 {
210         INIT_LIST_HEAD(&dev->vbi_q.queue);
211         init_timer(&dev->vbi_q.timeout);
212         dev->vbi_q.timeout.function = saa7134_buffer_timeout;
213         dev->vbi_q.timeout.data     = (unsigned long)(&dev->vbi_q);
214         dev->vbi_q.dev              = dev;
215
216         if (vbibufs < 2)
217                 vbibufs = 2;
218         if (vbibufs > VIDEO_MAX_FRAME)
219                 vbibufs = VIDEO_MAX_FRAME;
220         return 0;
221 }
222
223 int saa7134_vbi_fini(struct saa7134_dev *dev)
224 {
225         /* nothing */
226         return 0;
227 }
228
229 void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status)
230 {
231         spin_lock(&dev->slock);
232         if (dev->vbi_q.curr) {
233                 dev->vbi_fieldcount++;
234                 /* make sure we have seen both fields */
235                 if ((status & 0x10) == 0x00) {
236                         dev->vbi_q.curr->top_seen = 1;
237                         goto done;
238                 }
239                 if (!dev->vbi_q.curr->top_seen)
240                         goto done;
241
242                 dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount;
243                 saa7134_buffer_finish(dev,&dev->vbi_q,VIDEOBUF_DONE);
244         }
245         saa7134_buffer_next(dev,&dev->vbi_q);
246
247  done:
248         spin_unlock(&dev->slock);
249 }
250
251 /* ----------------------------------------------------------- */
252 /*
253  * Local variables:
254  * c-basic-offset: 8
255  * End:
256  */