Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.git] / drivers / media / video / cx23885 / cx23885-vbi.c
1 /*
2  *  Driver for the Conexant CX23885 PCIe bridge
3  *
4  *  Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>
5  *
6  *  This program is free software; you can redistribute it and/or modify
7  *  it under the terms of the GNU General Public License as published by
8  *  the Free Software Foundation; either version 2 of the License, or
9  *  (at your option) any later version.
10  *
11  *  This program is distributed in the hope that it will be useful,
12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  *
15  *  GNU General Public License for more details.
16  *
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.
20  */
21
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/init.h>
26 #include <linux/slab.h>
27
28 #include "cx23885.h"
29
30 static unsigned int vbibufs = 4;
31 module_param(vbibufs, int, 0644);
32 MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
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 #define dprintk(level, fmt, arg...)\
39         do { if (vbi_debug >= level)\
40                 printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
41         } while (0)
42
43 /* ------------------------------------------------------------------ */
44
45 int cx23885_vbi_fmt(struct file *file, void *priv,
46         struct v4l2_format *f)
47 {
48         struct cx23885_fh *fh = priv;
49         struct cx23885_dev *dev = fh->dev;
50
51         if (dev->tvnorm & V4L2_STD_525_60) {
52                 /* ntsc */
53                 f->fmt.vbi.sampling_rate = 28636363;
54                 f->fmt.vbi.start[0] = 10;
55                 f->fmt.vbi.start[1] = 273;
56
57         } else if (dev->tvnorm & V4L2_STD_625_50) {
58                 /* pal */
59                 f->fmt.vbi.sampling_rate = 35468950;
60                 f->fmt.vbi.start[0] = 7 - 1;
61                 f->fmt.vbi.start[1] = 319 - 1;
62         }
63         return 0;
64 }
65
66 static int cx23885_start_vbi_dma(struct cx23885_dev    *dev,
67                          struct cx23885_dmaqueue *q,
68                          struct cx23885_buffer   *buf)
69 {
70         /* setup fifo + format */
71         cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
72                                 buf->vb.width, buf->risc.dma);
73
74         /* reset counter */
75         q->count = 1;
76
77         /* enable irqs */
78         cx_set(PCI_INT_MSK, cx_read(PCI_INT_MSK) | 0x01);
79         cx_set(VID_A_INT_MSK, 0x000022);
80
81         /* start dma */
82         cx_set(DEV_CNTRL2, (1<<5));
83         cx_set(VID_A_DMA_CTL, 0x00000022);
84
85         return 0;
86 }
87
88
89 static int cx23885_restart_vbi_queue(struct cx23885_dev    *dev,
90                              struct cx23885_dmaqueue *q)
91 {
92         struct cx23885_buffer *buf;
93         struct list_head *item;
94
95         if (list_empty(&q->active))
96                 return 0;
97
98         buf = list_entry(q->active.next, struct cx23885_buffer, vb.queue);
99         dprintk(2, "restart_queue [%p/%d]: restart dma\n",
100                 buf, buf->vb.i);
101         cx23885_start_vbi_dma(dev, q, buf);
102         list_for_each(item, &q->active) {
103                 buf = list_entry(item, struct cx23885_buffer, vb.queue);
104                 buf->count = q->count++;
105         }
106         mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
107         return 0;
108 }
109
110 void cx23885_vbi_timeout(unsigned long data)
111 {
112         struct cx23885_dev *dev = (struct cx23885_dev *)data;
113         struct cx23885_dmaqueue *q = &dev->vbiq;
114         struct cx23885_buffer *buf;
115         unsigned long flags;
116
117         cx23885_sram_channel_dump(dev, &dev->sram_channels[SRAM_CH02]);
118
119         cx_clear(VID_A_DMA_CTL, 0x22);
120
121         spin_lock_irqsave(&dev->slock, flags);
122         while (!list_empty(&q->active)) {
123                 buf = list_entry(q->active.next, struct cx23885_buffer,
124                         vb.queue);
125                 list_del(&buf->vb.queue);
126                 buf->vb.state = VIDEOBUF_ERROR;
127                 wake_up(&buf->vb.done);
128                 printk("%s/0: [%p/%d] timeout - dma=0x%08lx\n", dev->name,
129                        buf, buf->vb.i, (unsigned long)buf->risc.dma);
130         }
131         cx23885_restart_vbi_queue(dev, q);
132         spin_unlock_irqrestore(&dev->slock, flags);
133 }
134
135 /* ------------------------------------------------------------------ */
136 #define VBI_LINE_LENGTH 2048
137 #define VBI_LINE_COUNT 17
138
139 static int
140 vbi_setup(struct videobuf_queue *q, unsigned int *count, unsigned int *size)
141 {
142         *size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
143         if (0 == *count)
144                 *count = vbibufs;
145         if (*count < 2)
146                 *count = 2;
147         if (*count > 32)
148                 *count = 32;
149         return 0;
150 }
151
152 static int
153 vbi_prepare(struct videobuf_queue *q, struct videobuf_buffer *vb,
154             enum v4l2_field field)
155 {
156         struct cx23885_fh *fh  = q->priv_data;
157         struct cx23885_dev *dev = fh->dev;
158         struct cx23885_buffer *buf = container_of(vb,
159                 struct cx23885_buffer, vb);
160         struct videobuf_dmabuf *dma = videobuf_to_dma(&buf->vb);
161         unsigned int size;
162         int rc;
163
164         size = VBI_LINE_COUNT * VBI_LINE_LENGTH * 2;
165         if (0 != buf->vb.baddr  &&  buf->vb.bsize < size)
166                 return -EINVAL;
167
168         if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {
169                 buf->vb.width  = VBI_LINE_LENGTH;
170                 buf->vb.height = VBI_LINE_COUNT;
171                 buf->vb.size   = size;
172                 buf->vb.field  = V4L2_FIELD_SEQ_TB;
173
174                 rc = videobuf_iolock(q, &buf->vb, NULL);
175                 if (0 != rc)
176                         goto fail;
177                 cx23885_risc_buffer(dev->pci, &buf->risc,
178                                  dma->sglist,
179                                  0, buf->vb.width * buf->vb.height,
180                                  buf->vb.width, 0,
181                                  buf->vb.height);
182         }
183         buf->vb.state = VIDEOBUF_PREPARED;
184         return 0;
185
186  fail:
187         cx23885_free_buffer(q, buf);
188         return rc;
189 }
190
191 static void
192 vbi_queue(struct videobuf_queue *vq, struct videobuf_buffer *vb)
193 {
194         struct cx23885_buffer   *buf =
195                 container_of(vb, struct cx23885_buffer, vb);
196         struct cx23885_buffer   *prev;
197         struct cx23885_fh       *fh   = vq->priv_data;
198         struct cx23885_dev      *dev  = fh->dev;
199         struct cx23885_dmaqueue *q    = &dev->vbiq;
200
201         /* add jump to stopper */
202         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_IRQ1 | RISC_CNT_INC);
203         buf->risc.jmp[1] = cpu_to_le32(q->stopper.dma);
204         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
205
206         if (list_empty(&q->active)) {
207                 list_add_tail(&buf->vb.queue, &q->active);
208                 cx23885_start_vbi_dma(dev, q, buf);
209                 buf->vb.state = VIDEOBUF_ACTIVE;
210                 buf->count    = q->count++;
211                 mod_timer(&q->timeout, jiffies+BUFFER_TIMEOUT);
212                 dprintk(2, "[%p/%d] vbi_queue - first active\n",
213                         buf, buf->vb.i);
214
215         } else {
216                 prev = list_entry(q->active.prev, struct cx23885_buffer,
217                         vb.queue);
218                 list_add_tail(&buf->vb.queue, &q->active);
219                 buf->vb.state = VIDEOBUF_ACTIVE;
220                 buf->count    = q->count++;
221                 prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
222                 prev->risc.jmp[2] = cpu_to_le32(0); /* Bits 63-32 */
223                 dprintk(2, "[%p/%d] buffer_queue - append to active\n",
224                         buf, buf->vb.i);
225         }
226 }
227
228 static void vbi_release(struct videobuf_queue *q, struct videobuf_buffer *vb)
229 {
230         struct cx23885_buffer *buf =
231                 container_of(vb, struct cx23885_buffer, vb);
232
233         cx23885_free_buffer(q, buf);
234 }
235
236 struct videobuf_queue_ops cx23885_vbi_qops = {
237         .buf_setup    = vbi_setup,
238         .buf_prepare  = vbi_prepare,
239         .buf_queue    = vbi_queue,
240         .buf_release  = vbi_release,
241 };
242
243 /* ------------------------------------------------------------------ */
244 /*
245  * Local variables:
246  * c-basic-offset: 8
247  * End:
248  */