1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
/*
* Driver for the Conexant CX23885 PCIe bridge
*
* Copyright (c) 2007 Steven Toth <stoth@linuxtv.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include "cx23885.h"
static unsigned int vbibufs = 4;
module_param(vbibufs, int, 0644);
MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
static unsigned int vbi_debug;
module_param(vbi_debug, int, 0644);
MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
#define dprintk(level, fmt, arg...)\
do { if (vbi_debug >= level)\
printk(KERN_DEBUG "%s/0: " fmt, dev->name, ## arg);\
} while (0)
/* ------------------------------------------------------------------ */
#define VBI_LINE_LENGTH 1440
#define VBI_NTSC_LINE_COUNT 12
#define VBI_PAL_LINE_COUNT 18
int cx23885_vbi_fmt(struct file *file, void *priv,
struct v4l2_format *f)
{
struct cx23885_dev *dev = video_drvdata(file);
f->fmt.vbi.sampling_rate = 27000000;
f->fmt.vbi.samples_per_line = VBI_LINE_LENGTH;
f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
f->fmt.vbi.offset = 0;
f->fmt.vbi.flags = 0;
if (dev->tvnorm & V4L2_STD_525_60) {
/* ntsc */
f->fmt.vbi.start[0] = V4L2_VBI_ITU_525_F1_START + 9;
f->fmt.vbi.start[1] = V4L2_VBI_ITU_525_F2_START + 9;
f->fmt.vbi.count[0] = VBI_NTSC_LINE_COUNT;
f->fmt.vbi.count[1] = VBI_NTSC_LINE_COUNT;
} else if (dev->tvnorm & V4L2_STD_625_50) {
/* pal */
f->fmt.vbi.start[0] = V4L2_VBI_ITU_625_F1_START + 5;
f->fmt.vbi.start[1] = V4L2_VBI_ITU_625_F2_START + 5;
f->fmt.vbi.count[0] = VBI_PAL_LINE_COUNT;
f->fmt.vbi.count[1] = VBI_PAL_LINE_COUNT;
}
return 0;
}
/* We're given the Video Interrupt status register.
* The cx23885_video_irq() func has already validated
* the potential error bits, we just need to
* deal with vbi payload and return indication if
* we actually processed any payload.
*/
int cx23885_vbi_irq(struct cx23885_dev *dev, u32 status)
{
u32 count;
int handled = 0;
if (status & VID_BC_MSK_VBI_RISCI1) {
dprintk(1, "%s() VID_BC_MSK_VBI_RISCI1\n", __func__);
spin_lock(&dev->slock);
count = cx_read(VID_A_GPCNT);
cx23885_video_wakeup(dev, &dev->vbiq, count);
spin_unlock(&dev->slock);
handled++;
}
return handled;
}
static int cx23885_start_vbi_dma(struct cx23885_dev *dev,
struct cx23885_dmaqueue *q,
struct cx23885_buffer *buf)
{
dprintk(1, "%s()\n", __func__);
/* setup fifo + format */
cx23885_sram_channel_setup(dev, &dev->sram_channels[SRAM_CH02],
VBI_LINE_LENGTH, buf->risc.dma);
/* reset counter */
cx_write(VID_A_GPCNT_CTL, 3);
cx_write(VID_A_VBI_CTRL, 3);
cx_write(VBI_A_GPCNT_CTL, 3);
q->count = 0;
/* enable irq */
cx23885_irq_add_enable(dev, 0x01);
cx_set(VID_A_INT_MSK, 0x000022);
/* start dma */
cx_set(DEV_CNTRL2, (1<<5));
cx_set(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
return 0;
}
/* ------------------------------------------------------------------ */
static int queue_setup(struct vb2_queue *q, const struct v4l2_format *fmt,
unsigned int *num_buffers, unsigned int *num_planes,
unsigned int sizes[], void *alloc_ctxs[])
{
struct cx23885_dev *dev = q->drv_priv;
unsigned lines = VBI_PAL_LINE_COUNT;
if (dev->tvnorm & V4L2_STD_525_60)
lines = VBI_NTSC_LINE_COUNT;
*num_planes = 1;
sizes[0] = lines * VBI_LINE_LENGTH * 2;
return 0;
}
static int buffer_prepare(struct vb2_buffer *vb)
{
struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
struct cx23885_buffer *buf = container_of(vb,
struct cx23885_buffer, vb);
struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
unsigned lines = VBI_PAL_LINE_COUNT;
int ret;
if (dev->tvnorm & V4L2_STD_525_60)
lines = VBI_NTSC_LINE_COUNT;
if (vb2_plane_size(vb, 0) < lines * VBI_LINE_LENGTH * 2)
return -EINVAL;
vb2_set_plane_payload(vb, 0, lines * VBI_LINE_LENGTH * 2);
ret = dma_map_sg(&dev->pci->dev, sgt->sgl, sgt->nents, DMA_FROM_DEVICE);
if (!ret)
return -EIO;
cx23885_risc_vbibuffer(dev->pci, &buf->risc,
sgt->sgl,
0, VBI_LINE_LENGTH * lines,
VBI_LINE_LENGTH, 0,
lines);
return 0;
}
static void buffer_finish(struct vb2_buffer *vb)
{
struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
struct cx23885_buffer *buf = container_of(vb,
struct cx23885_buffer, vb);
struct sg_table *sgt = vb2_dma_sg_plane_desc(vb, 0);
cx23885_free_buffer(vb->vb2_queue->drv_priv, buf);
dma_unmap_sg(&dev->pci->dev, sgt->sgl, sgt->nents, DMA_FROM_DEVICE);
}
/*
* The risc program for each buffer works as follows: it starts with a simple
* 'JUMP to addr + 12', which is effectively a NOP. Then the code to DMA the
* buffer follows and at the end we have a JUMP back to the start + 12 (skipping
* the initial JUMP).
*
* This is the risc program of the first buffer to be queued if the active list
* is empty and it just keeps DMAing this buffer without generating any
* interrupts.
*
* If a new buffer is added then the initial JUMP in the code for that buffer
* will generate an interrupt which signals that the previous buffer has been
* DMAed successfully and that it can be returned to userspace.
*
* It also sets the final jump of the previous buffer to the start of the new
* buffer, thus chaining the new buffer into the DMA chain. This is a single
* atomic u32 write, so there is no race condition.
*
* The end-result of all this that you only get an interrupt when a buffer
* is ready, so the control flow is very easy.
*/
static void buffer_queue(struct vb2_buffer *vb)
{
struct cx23885_dev *dev = vb->vb2_queue->drv_priv;
struct cx23885_buffer *buf = container_of(vb, struct cx23885_buffer, vb);
struct cx23885_buffer *prev;
struct cx23885_dmaqueue *q = &dev->vbiq;
unsigned long flags;
buf->risc.cpu[1] = cpu_to_le32(buf->risc.dma + 12);
buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP | RISC_CNT_INC);
buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma + 12);
buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
if (list_empty(&q->active)) {
spin_lock_irqsave(&dev->slock, flags);
list_add_tail(&buf->queue, &q->active);
spin_unlock_irqrestore(&dev->slock, flags);
dprintk(2, "[%p/%d] vbi_queue - first active\n",
buf, buf->vb.v4l2_buf.index);
} else {
buf->risc.cpu[0] |= cpu_to_le32(RISC_IRQ1);
prev = list_entry(q->active.prev, struct cx23885_buffer,
queue);
spin_lock_irqsave(&dev->slock, flags);
list_add_tail(&buf->queue, &q->active);
spin_unlock_irqrestore(&dev->slock, flags);
prev->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
dprintk(2, "[%p/%d] buffer_queue - append to active\n",
buf, buf->vb.v4l2_buf.index);
}
}
static int cx23885_start_streaming(struct vb2_queue *q, unsigned int count)
{
struct cx23885_dev *dev = q->drv_priv;
struct cx23885_dmaqueue *dmaq = &dev->vbiq;
struct cx23885_buffer *buf = list_entry(dmaq->active.next,
struct cx23885_buffer, queue);
cx23885_start_vbi_dma(dev, dmaq, buf);
return 0;
}
static void cx23885_stop_streaming(struct vb2_queue *q)
{
struct cx23885_dev *dev = q->drv_priv;
struct cx23885_dmaqueue *dmaq = &dev->vbiq;
unsigned long flags;
cx_clear(VID_A_DMA_CTL, 0x22); /* FIFO and RISC enable */
spin_lock_irqsave(&dev->slock, flags);
while (!list_empty(&dmaq->active)) {
struct cx23885_buffer *buf = list_entry(dmaq->active.next,
struct cx23885_buffer, queue);
list_del(&buf->queue);
vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
}
spin_unlock_irqrestore(&dev->slock, flags);
}
struct vb2_ops cx23885_vbi_qops = {
.queue_setup = queue_setup,
.buf_prepare = buffer_prepare,
.buf_finish = buffer_finish,
.buf_queue = buffer_queue,
.wait_prepare = vb2_ops_wait_prepare,
.wait_finish = vb2_ops_wait_finish,
.start_streaming = cx23885_start_streaming,
.stop_streaming = cx23885_stop_streaming,
};
|
