1 /*
2 * $Id: saa7134-ts.c,v 1.12 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 #include <linux/delay.h>
30
31 #include "saa7134-reg.h"
32 #include "saa7134.h"
33
34 /* ------------------------------------------------------------------ */
35
36 static unsigned int ts_debug = 0;
37 module_param(ts_debug, int, 0644);
38 MODULE_PARM_DESC(ts_debug,"enable debug messages [ts]");
39
40 #define dprintk(fmt, arg...) if (ts_debug) \
41 printk(KERN_DEBUG "%s/ts: " fmt, dev->name , ## arg)
42
43 /* ------------------------------------------------------------------ */
44
45 static int buffer_activate(struct saa7134_dev *dev,
46 struct saa7134_buf *buf,
47 struct saa7134_buf *next)
48 {
49 u32 control;
50
51 dprintk("buffer_activate [%p]",buf);
52 buf->vb.state = STATE_ACTIVE;
53 buf->top_seen = 0;
54
55 /* dma: setup channel 5 (= TS) */
56 control = SAA7134_RS_CONTROL_BURST_16 |
57 SAA7134_RS_CONTROL_ME |
58 (buf->pt->dma >> 12);
59
60 if (NULL == next)
61 next = buf;
62 if (V4L2_FIELD_TOP == buf->vb.field) {
63 dprintk("- [top] buf=%p next=%p\n",buf,next);
64 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
65 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
66 } else {
67 dprintk("- [bottom] buf=%p next=%p\n",buf,next);
68 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
69 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
70 }
71 saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
72 saa_writel(SAA7134_RS_CONTROL(5),control);
73
74 /* start DMA */
75 saa7134_set_dmabits(dev);
76
77 mod_timer(&dev->ts_q.timeout, jiffies+BUFFER_TIMEOUT);
78 return 0;
79 }
80
81 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
82 enum v4l2_field field)
83 {
84 struct saa7134_dev *dev = q->priv_data;
85 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
86 unsigned int lines, llength, size;
87 int err;
88
89 dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
90
91 llength = TS_PACKET_SIZE;
92 lines = dev->ts.nr_packets;
93
94 size = lines * llength;
95 if (0 != buf->vb.baddr && buf->vb.bsize < size)
96 return -EINVAL;
97
98 if (buf->vb.size != size) {
99 saa7134_dma_free(dev,buf);
100 }
101
102 if (STATE_NEEDS_INIT == buf->vb.state) {
103 buf->vb.width = llength;
104 buf->vb.height = lines;
105 buf->vb.size = size;
106 buf->pt = &dev->ts.pt_ts;
107
108 err = videobuf_iolock(dev->pci,&buf->vb,NULL);
109 if (err)
110 goto oops;
111 err = saa7134_pgtable_build(dev->pci,buf->pt,
112 buf->vb.dma.sglist,
113 buf->vb.dma.sglen,
114 saa7134_buffer_startpage(buf));
115 if (err)
116 goto oops;
117 }
118 buf->vb.state = STATE_PREPARED;
119 buf->activate = buffer_activate;
120 buf->vb.field = field;
121 return 0;
122
123 oops:
124 saa7134_dma_free(dev,buf);
125 return err;
126 }
127
128 static int
129 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
130 {
131 struct saa7134_dev *dev = q->priv_data;
132
133 *size = TS_PACKET_SIZE * dev->ts.nr_packets;
134 if (0 == *count)
135 *count = dev->ts.nr_bufs;
136 *count = saa7134_buffer_count(*size,*count);
137 return 0;
138 }
139
140 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
141 {
142 struct saa7134_dev *dev = q->priv_data;
143 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
144
145 saa7134_buffer_queue(dev,&dev->ts_q,buf);
146 }
147
148 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
149 {
150 struct saa7134_dev *dev = q->priv_data;
151 struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
152
153 saa7134_dma_free(dev,buf);
154 }
155
156 struct videobuf_queue_ops saa7134_ts_qops = {
157 .buf_setup = buffer_setup,
158 .buf_prepare = buffer_prepare,
159 .buf_queue = buffer_queue,
160 .buf_release = buffer_release,
161 };
162 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
163
164 /* ----------------------------------------------------------- */
165 /* exported stuff */
166
167 static unsigned int tsbufs = 4;
168 module_param(tsbufs, int, 0444);
169 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
170
171 static unsigned int ts_nr_packets = 30;
172 module_param(ts_nr_packets, int, 0444);
173 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
174
175 int saa7134_ts_init1(struct saa7134_dev *dev)
176 {
177 /* sanitycheck insmod options */
178 if (tsbufs < 2)
179 tsbufs = 2;
180 if (tsbufs > VIDEO_MAX_FRAME)
181 tsbufs = VIDEO_MAX_FRAME;
182 if (ts_nr_packets < 4)
183 ts_nr_packets = 4;
184 if (ts_nr_packets > 312)
185 ts_nr_packets = 312;
186 dev->ts.nr_bufs = tsbufs;
187 dev->ts.nr_packets = ts_nr_packets;
188
189 INIT_LIST_HEAD(&dev->ts_q.queue);
190 init_timer(&dev->ts_q.timeout);
191 dev->ts_q.timeout.function = saa7134_buffer_timeout;
192 dev->ts_q.timeout.data = (unsigned long)(&dev->ts_q);
193 dev->ts_q.dev = dev;
194 dev->ts_q.need_two = 1;
195 saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
196
197 /* init TS hw */
198 saa_writeb(SAA7134_TS_SERIAL1, 0x00); /* deactivate TS softreset */
199 saa_writeb(SAA7134_TS_PARALLEL, 0xec); /* TSSOP high active, TSVAL high active, TSLOCK ignored */
200 saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
201 saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
202 saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
203 saa_writeb(SAA7134_TS_DMA2, ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
204
205 return 0;
206 }
207
208 int saa7134_ts_fini(struct saa7134_dev *dev)
209 {
210 saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
211 return 0;
212 }
213
214
215 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
216 {
217 enum v4l2_field field;
218
219 spin_lock(&dev->slock);
220 if (dev->ts_q.curr) {
221 field = dev->ts_q.curr->vb.field;
222 if (field == V4L2_FIELD_TOP) {
223 if ((status & 0x100000) != 0x100000)
224 goto done;
225 } else {
226 if ((status & 0x100000) != 0x000000)
227 goto done;
228 }
229 saa7134_buffer_finish(dev,&dev->ts_q,STATE_DONE);
230 }
231 saa7134_buffer_next(dev,&dev->ts_q);
232
233 done:
234 spin_unlock(&dev->slock);
235 }
236
237 /* ----------------------------------------------------------- */
238 /*
239 * Local variables:
240 * c-basic-offset: 8
241 * End:
242 */
243
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