[PATCH] v4l: 653: ts dma buffer synchronization was inverted
[linux-2.6.git] / drivers / media / video / saa7134 / saa7134-ts.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/moduleparam.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
50         dprintk("buffer_activate [%p]",buf);
51         buf->vb.state = STATE_ACTIVE;
52         buf->top_seen = 0;
53
54         if (NULL == next)
55                 next = buf;
56         if (V4L2_FIELD_TOP == buf->vb.field) {
57                 dprintk("- [top]     buf=%p next=%p\n",buf,next);
58                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(buf));
59                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(next));
60         } else {
61                 dprintk("- [bottom]  buf=%p next=%p\n",buf,next);
62                 saa_writel(SAA7134_RS_BA1(5),saa7134_buffer_base(next));
63                 saa_writel(SAA7134_RS_BA2(5),saa7134_buffer_base(buf));
64         }
65
66         /* start DMA */
67         saa7134_set_dmabits(dev);
68
69         mod_timer(&dev->ts_q.timeout, jiffies+BUFFER_TIMEOUT);
70         return 0;
71 }
72
73 static int buffer_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
74                           enum v4l2_field field)
75 {
76         struct saa7134_dev *dev = q->priv_data;
77         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
78         unsigned int lines, llength, size;
79         u32 control;
80         int err;
81
82         dprintk("buffer_prepare [%p,%s]\n",buf,v4l2_field_names[field]);
83
84         llength = TS_PACKET_SIZE;
85         lines = dev->ts.nr_packets;
86
87         size = lines * llength;
88         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
89                 return -EINVAL;
90
91         if (buf->vb.size != size) {
92                 saa7134_dma_free(dev,buf);
93         }
94
95         if (STATE_NEEDS_INIT == buf->vb.state) {
96                 buf->vb.width  = llength;
97                 buf->vb.height = lines;
98                 buf->vb.size   = size;
99                 buf->pt        = &dev->ts.pt_ts;
100
101                 err = videobuf_iolock(dev->pci,&buf->vb,NULL);
102                 if (err)
103                         goto oops;
104                 err = saa7134_pgtable_build(dev->pci,buf->pt,
105                                             buf->vb.dma.sglist,
106                                             buf->vb.dma.sglen,
107                                             saa7134_buffer_startpage(buf));
108                 if (err)
109                         goto oops;
110         }
111
112         /* dma: setup channel 5 (= TS) */
113         control = SAA7134_RS_CONTROL_BURST_16 |
114                   SAA7134_RS_CONTROL_ME |
115                   (buf->pt->dma >> 12);
116
117         saa_writeb(SAA7134_TS_DMA0, ((lines-1)&0xff));
118         saa_writeb(SAA7134_TS_DMA1, (((lines-1)>>8)&0xff));
119         saa_writeb(SAA7134_TS_DMA2, ((((lines-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
120         saa_writel(SAA7134_RS_PITCH(5),TS_PACKET_SIZE);
121         saa_writel(SAA7134_RS_CONTROL(5),control);
122
123         buf->vb.state = STATE_PREPARED;
124         buf->activate = buffer_activate;
125         buf->vb.field = field;
126         return 0;
127
128  oops:
129         saa7134_dma_free(dev,buf);
130         return err;
131 }
132
133 static int
134 buffer_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
135 {
136         struct saa7134_dev *dev = q->priv_data;
137
138         *size = TS_PACKET_SIZE * dev->ts.nr_packets;
139         if (0 == *count)
140                 *count = dev->ts.nr_bufs;
141         *count = saa7134_buffer_count(*size,*count);
142         return 0;
143 }
144
145 static void buffer_queue(struct videobuf_queue *q, struct videobuf_buffer *vb)
146 {
147         struct saa7134_dev *dev = q->priv_data;
148         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
149
150         saa7134_buffer_queue(dev,&dev->ts_q,buf);
151 }
152
153 static void buffer_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
154 {
155         struct saa7134_dev *dev = q->priv_data;
156         struct saa7134_buf *buf = container_of(vb,struct saa7134_buf,vb);
157
158         saa7134_dma_free(dev,buf);
159 }
160
161 struct videobuf_queue_ops saa7134_ts_qops = {
162         .buf_setup    = buffer_setup,
163         .buf_prepare  = buffer_prepare,
164         .buf_queue    = buffer_queue,
165         .buf_release  = buffer_release,
166 };
167 EXPORT_SYMBOL_GPL(saa7134_ts_qops);
168
169 /* ----------------------------------------------------------- */
170 /* exported stuff                                              */
171
172 static unsigned int tsbufs = 8;
173 module_param(tsbufs, int, 0444);
174 MODULE_PARM_DESC(tsbufs,"number of ts buffers, range 2-32");
175
176 static unsigned int ts_nr_packets = 64;
177 module_param(ts_nr_packets, int, 0444);
178 MODULE_PARM_DESC(ts_nr_packets,"size of a ts buffers (in ts packets)");
179
180 int saa7134_ts_init1(struct saa7134_dev *dev)
181 {
182         /* sanitycheck insmod options */
183         if (tsbufs < 2)
184                 tsbufs = 2;
185         if (tsbufs > VIDEO_MAX_FRAME)
186                 tsbufs = VIDEO_MAX_FRAME;
187         if (ts_nr_packets < 4)
188                 ts_nr_packets = 4;
189         if (ts_nr_packets > 312)
190                 ts_nr_packets = 312;
191         dev->ts.nr_bufs    = tsbufs;
192         dev->ts.nr_packets = ts_nr_packets;
193
194         INIT_LIST_HEAD(&dev->ts_q.queue);
195         init_timer(&dev->ts_q.timeout);
196         dev->ts_q.timeout.function = saa7134_buffer_timeout;
197         dev->ts_q.timeout.data     = (unsigned long)(&dev->ts_q);
198         dev->ts_q.dev              = dev;
199         dev->ts_q.need_two         = 1;
200         saa7134_pgtable_alloc(dev->pci,&dev->ts.pt_ts);
201
202         /* init TS hw */
203         saa_writeb(SAA7134_TS_SERIAL1, 0x00);  /* deactivate TS softreset */
204         saa_writeb(SAA7134_TS_PARALLEL, 0xec); /* TSSOP high active, TSVAL high active, TSLOCK ignored */
205         saa_writeb(SAA7134_TS_PARALLEL_SERIAL, (TS_PACKET_SIZE-1));
206         saa_writeb(SAA7134_TS_DMA0, ((dev->ts.nr_packets-1)&0xff));
207         saa_writeb(SAA7134_TS_DMA1, (((dev->ts.nr_packets-1)>>8)&0xff));
208         saa_writeb(SAA7134_TS_DMA2, ((((dev->ts.nr_packets-1)>>16)&0x3f) | 0x00)); /* TSNOPIT=0, TSCOLAP=0 */
209
210         return 0;
211 }
212
213 int saa7134_ts_fini(struct saa7134_dev *dev)
214 {
215         saa7134_pgtable_free(dev->pci,&dev->ts.pt_ts);
216         return 0;
217 }
218
219
220 void saa7134_irq_ts_done(struct saa7134_dev *dev, unsigned long status)
221 {
222         enum v4l2_field field;
223
224         spin_lock(&dev->slock);
225         if (dev->ts_q.curr) {
226                 field = dev->ts_q.curr->vb.field;
227                 if (field == V4L2_FIELD_TOP) {
228                         if ((status & 0x100000) != 0x000000)
229                                 goto done;
230                 } else {
231                         if ((status & 0x100000) != 0x100000)
232                                 goto done;
233                 }
234                 saa7134_buffer_finish(dev,&dev->ts_q,STATE_DONE);
235         }
236         saa7134_buffer_next(dev,&dev->ts_q);
237
238  done:
239         spin_unlock(&dev->slock);
240 }
241
242 /* ----------------------------------------------------------- */
243 /*
244  * Local variables:
245  * c-basic-offset: 8
246  * End:
247  */