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1da177e4 LT |
1 | /* |
2 | * $Id: saa7134-vbi.c,v 1.6 2004/12/10 12:33:39 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/moduleparam.h> | |
28 | #include <linux/kernel.h> | |
29 | #include <linux/slab.h> | |
30 | ||
31 | #include "saa7134-reg.h" | |
32 | #include "saa7134.h" | |
33 | ||
34 | /* ------------------------------------------------------------------ */ | |
35 | ||
36 | static unsigned int vbi_debug = 0; | |
37 | module_param(vbi_debug, int, 0644); | |
38 | MODULE_PARM_DESC(vbi_debug,"enable debug messages [vbi]"); | |
39 | ||
40 | static unsigned int vbibufs = 4; | |
41 | module_param(vbibufs, int, 0444); | |
42 | MODULE_PARM_DESC(vbibufs,"number of vbi buffers, range 2-32"); | |
43 | ||
44 | #define dprintk(fmt, arg...) if (vbi_debug) \ | |
45 | printk(KERN_DEBUG "%s/vbi: " fmt, dev->name , ## arg) | |
46 | ||
47 | /* ------------------------------------------------------------------ */ | |
48 | ||
49 | #define VBI_LINE_COUNT 16 | |
50 | #define VBI_LINE_LENGTH 2048 | |
51 | #define VBI_SCALE 0x200 | |
52 | ||
53 | static void task_init(struct saa7134_dev *dev, struct saa7134_buf *buf, | |
54 | int task) | |
55 | { | |
56 | struct saa7134_tvnorm *norm = dev->tvnorm; | |
57 | ||
58 | /* setup video scaler */ | |
59 | saa_writeb(SAA7134_VBI_H_START1(task), norm->h_start & 0xff); | |
60 | saa_writeb(SAA7134_VBI_H_START2(task), norm->h_start >> 8); | |
61 | saa_writeb(SAA7134_VBI_H_STOP1(task), norm->h_stop & 0xff); | |
62 | saa_writeb(SAA7134_VBI_H_STOP2(task), norm->h_stop >> 8); | |
63 | saa_writeb(SAA7134_VBI_V_START1(task), norm->vbi_v_start & 0xff); | |
64 | saa_writeb(SAA7134_VBI_V_START2(task), norm->vbi_v_start >> 8); | |
65 | saa_writeb(SAA7134_VBI_V_STOP1(task), norm->vbi_v_stop & 0xff); | |
66 | saa_writeb(SAA7134_VBI_V_STOP2(task), norm->vbi_v_stop >> 8); | |
67 | ||
68 | saa_writeb(SAA7134_VBI_H_SCALE_INC1(task), VBI_SCALE & 0xff); | |
69 | saa_writeb(SAA7134_VBI_H_SCALE_INC2(task), VBI_SCALE >> 8); | |
70 | saa_writeb(SAA7134_VBI_PHASE_OFFSET_LUMA(task), 0x00); | |
71 | saa_writeb(SAA7134_VBI_PHASE_OFFSET_CHROMA(task), 0x00); | |
72 | ||
73 | saa_writeb(SAA7134_VBI_H_LEN1(task), buf->vb.width & 0xff); | |
74 | saa_writeb(SAA7134_VBI_H_LEN2(task), buf->vb.width >> 8); | |
75 | saa_writeb(SAA7134_VBI_V_LEN1(task), buf->vb.height & 0xff); | |
76 | saa_writeb(SAA7134_VBI_V_LEN2(task), buf->vb.height >> 8); | |
77 | ||
78 | saa_andorb(SAA7134_DATA_PATH(task), 0xc0, 0x00); | |
79 | } | |
80 | ||
81 | /* ------------------------------------------------------------------ */ | |
82 | ||
83 | static int buffer_activate(struct saa7134_dev *dev, | |
84 | struct saa7134_buf *buf, | |
85 | struct saa7134_buf *next) | |
86 | { | |
87 | unsigned long control,base; | |
88 | ||
89 | dprintk("buffer_activate [%p]\n",buf); | |
90 | buf->vb.state = STATE_ACTIVE; | |
91 | buf->top_seen = 0; | |
92 | ||
93 | task_init(dev,buf,TASK_A); | |
94 | task_init(dev,buf,TASK_B); | |
95 | saa_writeb(SAA7134_OFMT_DATA_A, 0x06); | |
96 | saa_writeb(SAA7134_OFMT_DATA_B, 0x06); | |
97 | ||
98 | /* DMA: setup channel 2+3 (= VBI Task A+B) */ | |
99 | base = saa7134_buffer_base(buf); | |
100 | control = SAA7134_RS_CONTROL_BURST_16 | | |
101 | SAA7134_RS_CONTROL_ME | | |
102 | (buf->pt->dma >> 12); | |
103 | saa_writel(SAA7134_RS_BA1(2),base); | |
104 | saa_writel(SAA7134_RS_BA2(2),base + buf->vb.size/2); | |
105 | saa_writel(SAA7134_RS_PITCH(2),buf->vb.width); | |
106 | saa_writel(SAA7134_RS_CONTROL(2),control); | |
107 | saa_writel(SAA7134_RS_BA1(3),base); | |
108 | saa_writel(SAA7134_RS_BA2(3),base + buf->vb.size/2); | |
109 | saa_writel(SAA7134_RS_PITCH(3),buf->vb.width); | |
110 | saa_writel(SAA7134_RS_CONTROL(3),control); | |
111 | ||
112 | /* start DMA */ | |
113 | saa7134_set_dmabits(dev); | |
114 | mod_timer(&dev->vbi_q.timeout, jiffies+BUFFER_TIMEOUT); | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | static int buffer_prepare(struct videobuf_queue *q, | |
120 | struct videobuf_buffer *vb, | |
121 | enum v4l2_field field) | |
122 | { | |
123 | struct saa7134_fh *fh = q->priv_data; | |
124 | struct saa7134_dev *dev = fh->dev; | |
125 | struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); | |
126 | struct saa7134_tvnorm *norm = dev->tvnorm; | |
127 | unsigned int lines, llength, size; | |
128 | int err; | |
129 | ||
130 | lines = norm->vbi_v_stop - norm->vbi_v_start +1; | |
131 | if (lines > VBI_LINE_COUNT) | |
132 | lines = VBI_LINE_COUNT; | |
133 | #if 1 | |
134 | llength = VBI_LINE_LENGTH; | |
135 | #else | |
136 | llength = (norm->h_stop - norm->h_start +1) * 2; | |
137 | if (llength > VBI_LINE_LENGTH) | |
138 | llength = VBI_LINE_LENGTH; | |
139 | #endif | |
140 | size = lines * llength * 2; | |
141 | if (0 != buf->vb.baddr && buf->vb.bsize < size) | |
142 | return -EINVAL; | |
143 | ||
144 | if (buf->vb.size != size) | |
145 | saa7134_dma_free(dev,buf); | |
146 | ||
147 | if (STATE_NEEDS_INIT == buf->vb.state) { | |
148 | buf->vb.width = llength; | |
149 | buf->vb.height = lines; | |
150 | buf->vb.size = size; | |
151 | buf->pt = &fh->pt_vbi; | |
152 | ||
153 | err = videobuf_iolock(dev->pci,&buf->vb,NULL); | |
154 | if (err) | |
155 | goto oops; | |
156 | err = saa7134_pgtable_build(dev->pci,buf->pt, | |
157 | buf->vb.dma.sglist, | |
158 | buf->vb.dma.sglen, | |
159 | saa7134_buffer_startpage(buf)); | |
160 | if (err) | |
161 | goto oops; | |
162 | } | |
163 | buf->vb.state = STATE_PREPARED; | |
164 | buf->activate = buffer_activate; | |
165 | buf->vb.field = field; | |
166 | return 0; | |
167 | ||
168 | oops: | |
169 | saa7134_dma_free(dev,buf); | |
170 | return err; | |
171 | } | |
172 | ||
173 | static int | |
174 | buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size) | |
175 | { | |
176 | struct saa7134_fh *fh = q->priv_data; | |
177 | struct saa7134_dev *dev = fh->dev; | |
178 | int llength,lines; | |
179 | ||
180 | lines = dev->tvnorm->vbi_v_stop - dev->tvnorm->vbi_v_start +1; | |
181 | #if 1 | |
182 | llength = VBI_LINE_LENGTH; | |
183 | #else | |
184 | llength = (norm->h_stop - norm->h_start +1) * 2; | |
185 | if (llength > VBI_LINE_LENGTH) | |
186 | llength = VBI_LINE_LENGTH; | |
187 | #endif | |
188 | *size = lines * llength * 2; | |
189 | if (0 == *count) | |
190 | *count = vbibufs; | |
191 | *count = saa7134_buffer_count(*size,*count); | |
192 | return 0; | |
193 | } | |
194 | ||
195 | static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb) | |
196 | { | |
197 | struct saa7134_fh *fh = q->priv_data; | |
198 | struct saa7134_dev *dev = fh->dev; | |
199 | struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); | |
200 | ||
201 | saa7134_buffer_queue(dev,&dev->vbi_q,buf); | |
202 | } | |
203 | ||
204 | static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb) | |
205 | { | |
206 | struct saa7134_fh *fh = q->priv_data; | |
207 | struct saa7134_dev *dev = fh->dev; | |
208 | struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb); | |
209 | ||
210 | saa7134_dma_free(dev,buf); | |
211 | } | |
212 | ||
213 | struct videobuf_queue_ops saa7134_vbi_qops = { | |
214 | .buf_setup = buffer_setup, | |
215 | .buf_prepare = buffer_prepare, | |
216 | .buf_queue = buffer_queue, | |
217 | .buf_release = buffer_release, | |
218 | }; | |
219 | ||
220 | /* ------------------------------------------------------------------ */ | |
221 | ||
222 | int saa7134_vbi_init1(struct saa7134_dev *dev) | |
223 | { | |
224 | INIT_LIST_HEAD(&dev->vbi_q.queue); | |
225 | init_timer(&dev->vbi_q.timeout); | |
226 | dev->vbi_q.timeout.function = saa7134_buffer_timeout; | |
227 | dev->vbi_q.timeout.data = (unsigned long)(&dev->vbi_q); | |
228 | dev->vbi_q.dev = dev; | |
229 | ||
230 | if (vbibufs < 2) | |
231 | vbibufs = 2; | |
232 | if (vbibufs > VIDEO_MAX_FRAME) | |
233 | vbibufs = VIDEO_MAX_FRAME; | |
234 | return 0; | |
235 | } | |
236 | ||
237 | int saa7134_vbi_fini(struct saa7134_dev *dev) | |
238 | { | |
239 | /* nothing */ | |
240 | return 0; | |
241 | } | |
242 | ||
243 | void saa7134_irq_vbi_done(struct saa7134_dev *dev, unsigned long status) | |
244 | { | |
245 | spin_lock(&dev->slock); | |
246 | if (dev->vbi_q.curr) { | |
247 | dev->vbi_fieldcount++; | |
248 | /* make sure we have seen both fields */ | |
249 | if ((status & 0x10) == 0x00) { | |
250 | dev->vbi_q.curr->top_seen = 1; | |
251 | goto done; | |
252 | } | |
253 | if (!dev->vbi_q.curr->top_seen) | |
254 | goto done; | |
255 | ||
256 | dev->vbi_q.curr->vb.field_count = dev->vbi_fieldcount; | |
257 | saa7134_buffer_finish(dev,&dev->vbi_q,STATE_DONE); | |
258 | } | |
259 | saa7134_buffer_next(dev,&dev->vbi_q); | |
260 | ||
261 | done: | |
262 | spin_unlock(&dev->slock); | |
263 | } | |
264 | ||
265 | /* ----------------------------------------------------------- */ | |
266 | /* | |
267 | * Local variables: | |
268 | * c-basic-offset: 8 | |
269 | * End: | |
270 | */ |