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
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
|
/*
* Driver for the NXP SAA7164 PCIe bridge
*
* Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/slab.h>
#include "saa7164.h"
/* The PCI address space for buffer handling looks like this:
+-u32 wide-------------+
| +
+-u64 wide------------------------------------+
+ +
+----------------------+
| CurrentBufferPtr + Pointer to current PCI buffer >-+
+----------------------+ |
| Unused + |
+----------------------+ |
| Pitch + = 188 (bytes) |
+----------------------+ |
| PCI buffer size + = pitch * number of lines (312) |
+----------------------+ |
|0| Buf0 Write Offset + |
+----------------------+ v
|1| Buf1 Write Offset + |
+----------------------+ |
|2| Buf2 Write Offset + |
+----------------------+ |
|3| Buf3 Write Offset + |
+----------------------+ |
... More write offsets |
+---------------------------------------------+ |
+0| set of ptrs to PCI pagetables + |
+---------------------------------------------+ |
+1| set of ptrs to PCI pagetables + <--------+
+---------------------------------------------+
+2| set of ptrs to PCI pagetables +
+---------------------------------------------+
+3| set of ptrs to PCI pagetables + >--+
+---------------------------------------------+ |
... More buffer pointers | +----------------+
+->| pt[0] TS data |
| +----------------+
|
| +----------------+
+->| pt[1] TS data |
| +----------------+
| etc
*/
void saa7164_buffer_display(struct saa7164_buffer *buf)
{
struct saa7164_dev *dev = buf->port->dev;
int i;
dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n",
__func__, buf, buf->idx);
dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%p len = 0x%x\n",
buf->cpu, (void *)buf->dma, buf->pci_size);
dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%p len = 0x%x\n",
buf->pt_cpu, (void *)buf->pt_dma, buf->pt_size);
/* Format the Page Table Entries to point into the data buffer */
for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
i, buf->pt_cpu, (u64)*(buf->pt_cpu));
}
}
/* Allocate a new buffer structure and associated PCI space in bytes.
* len must be a multiple of sizeof(u64)
*/
struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
u32 len)
{
tmHWStreamParameters_t *params = &port->hw_streamingparams;
struct saa7164_buffer *buf = 0;
struct saa7164_dev *dev = port->dev;
int i;
if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
goto ret;
}
buf = kzalloc(sizeof(struct saa7164_buffer), GFP_KERNEL);
if (buf == NULL) {
log_warn("%s() SAA_ERR_NO_RESOURCES\n", __func__);
goto ret;
}
buf->idx = -1;
buf->port = port;
buf->flags = SAA7164_BUFFER_FREE;
buf->pos = 0;
buf->actual_size = params->pitch * params->numberoflines;
/* TODO: arg len is being ignored */
buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
/* Allocate contiguous memory */
buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
&buf->dma);
if (!buf->cpu)
goto fail1;
buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
&buf->pt_dma);
if (!buf->pt_cpu)
goto fail2;
/* init the buffers to a known pattern, easier during debugging */
memset(buf->cpu, 0xff, buf->pci_size);
memset(buf->pt_cpu, 0xff, buf->pt_size);
dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p\n",
__func__, buf);
dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
buf->cpu, (long)buf->dma, buf->pci_size);
dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
/* Format the Page Table Entries to point into the data buffer */
for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
*(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
}
goto ret;
fail2:
pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
fail1:
kfree(buf);
buf = 0;
ret:
return buf;
}
int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
{
struct saa7164_dev *dev;
if (!buf || !buf->port)
return SAA_ERR_BAD_PARAMETER;
dev = buf->port->dev;
dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
__func__, buf);
if (buf->flags != SAA7164_BUFFER_FREE)
log_warn(" freeing a non-free buffer\n");
pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
kfree(buf);
return SAA_OK;
}
int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
{
struct saa7164_dev *dev = port->dev;
if ((i < 0) || (i >= port->hwcfg.buffercount))
return -EINVAL;
dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
return 0;
}
/* Write a buffer into the hardware */
int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
{
struct saa7164_port *port = buf->port;
struct saa7164_dev *dev = port->dev;
if ((i < 0) || (i >= port->hwcfg.buffercount))
return -EINVAL;
dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
buf->idx = i; /* Note of which buffer list index position we occupy */
buf->flags = SAA7164_BUFFER_BUSY;
buf->pos = 0;
/* TODO: Review this in light of 32v64 assignments */
saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) "
"buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
buf->idx,
(u64)port->bufoffset + (i * sizeof(u32)),
saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
(u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
(u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
buf->idx);
return 0;
}
int saa7164_buffer_cfg_port(struct saa7164_port *port)
{
tmHWStreamParameters_t *params = &port->hw_streamingparams;
struct saa7164_dev *dev = port->dev;
struct saa7164_buffer *buf;
struct list_head *c, *n;
int i = 0;
dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
saa7164_writel(port->bufcounter, 0);
saa7164_writel(port->pitch, params->pitch);
saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
dprintk(DBGLVL_BUF, " configured:\n");
dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio);
dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter,
saa7164_readl(port->bufcounter));
dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch,
saa7164_readl(port->pitch));
dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize,
saa7164_readl(port->bufsize));
dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount);
dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset);
dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h);
dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l);
/* Poke the buffers and offsets into PCI space */
mutex_lock(&port->dmaqueue_lock);
list_for_each_safe(c, n, &port->dmaqueue.list) {
buf = list_entry(c, struct saa7164_buffer, list);
if (buf->flags != SAA7164_BUFFER_FREE)
BUG();
/* Place the buffer in the h/w queue */
saa7164_buffer_activate(buf, i);
/* Don't exceed the device maximum # bufs */
if (i++ > port->hwcfg.buffercount)
BUG();
}
mutex_unlock(&port->dmaqueue_lock);
return 0;
}
struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, u32 len)
{
struct saa7164_user_buffer *buf;
buf = kzalloc(sizeof(struct saa7164_user_buffer), GFP_KERNEL);
if (buf == 0)
return 0;
buf->data = kzalloc(len, GFP_KERNEL);
if (buf->data == 0) {
kfree(buf);
return 0;
}
buf->actual_size = len;
buf->pos = 0;
dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n",
__func__, buf);
return buf;
}
void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
{
if (!buf)
return;
if (buf->data) {
kfree(buf->data);
buf->data = 0;
}
if (buf)
kfree(buf);
}
|
