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Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / media / video / saa7164 / saa7164-buffer.c
blob66696fa8341d1d1b646565d6802f99b1d33e0898
1 /*
2 * Driver for the NXP SAA7164 PCIe bridge
3 *
4 * Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
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/slab.h>
23
24 #include "saa7164.h"
25
26 /* The PCI address space for buffer handling looks like this:
27 *
28 * +-u32 wide-------------+
29 * | +
30 * +-u64 wide------------------------------------+
31 * + +
32 * +----------------------+
33 * | CurrentBufferPtr + Pointer to current PCI buffer >-+
34 * +----------------------+ |
35 * | Unused + |
36 * +----------------------+ |
37 * | Pitch + = 188 (bytes) |
38 * +----------------------+ |
39 * | PCI buffer size + = pitch * number of lines (312) |
40 * +----------------------+ |
41 * |0| Buf0 Write Offset + |
42 * +----------------------+ v
43 * |1| Buf1 Write Offset + |
44 * +----------------------+ |
45 * |2| Buf2 Write Offset + |
46 * +----------------------+ |
47 * |3| Buf3 Write Offset + |
48 * +----------------------+ |
49 * ... More write offsets |
50 * +---------------------------------------------+ |
51 * +0| set of ptrs to PCI pagetables + |
52 * +---------------------------------------------+ |
53 * +1| set of ptrs to PCI pagetables + <--------+
54 * +---------------------------------------------+
55 * +2| set of ptrs to PCI pagetables +
56 * +---------------------------------------------+
57 * +3| set of ptrs to PCI pagetables + >--+
58 * +---------------------------------------------+ |
59 * ... More buffer pointers | +----------------+
60 * +->| pt[0] TS data |
61 * | +----------------+
62 * |
63 * | +----------------+
64 * +->| pt[1] TS data |
65 * | +----------------+
66 * | etc
67 */
68
69 void saa7164_buffer_display(struct saa7164_buffer *buf)
70 {
71 struct saa7164_dev *dev = buf->port->dev;
72 int i;
73
74 dprintk(DBGLVL_BUF, "%s() buffer @ 0x%p nr=%d\n",
75 __func__, buf, buf->idx);
76 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08llx len = 0x%x\n",
77 buf->cpu, (long long)buf->dma, buf->pci_size);
78 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08llx len = 0x%x\n",
79 buf->pt_cpu, (long long)buf->pt_dma, buf->pt_size);
80
81 /* Format the Page Table Entries to point into the data buffer */
82 for (i = 0 ; i < SAA7164_PT_ENTRIES; i++) {
83
84 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
85 i, buf->pt_cpu, (u64)*(buf->pt_cpu));
86
87 }
88 }
89 /* Allocate a new buffer structure and associated PCI space in bytes.
90 * len must be a multiple of sizeof(u64)
91 */
92 struct saa7164_buffer *saa7164_buffer_alloc(struct saa7164_port *port,
93 u32 len)
94 {
95 struct tmHWStreamParameters *params = &port->hw_streamingparams;
96 struct saa7164_buffer *buf = NULL;
97 struct saa7164_dev *dev = port->dev;
98 int i;
99
100 if ((len == 0) || (len >= 65536) || (len % sizeof(u64))) {
101 log_warn("%s() SAA_ERR_BAD_PARAMETER\n", __func__);
102 goto ret;
103 }
104
105 buf = kzalloc(sizeof(struct saa7164_buffer), GFP_KERNEL);
106 if (!buf) {
107 log_warn("%s() SAA_ERR_NO_RESOURCES\n", __func__);
108 goto ret;
109 }
110
111 buf->idx = -1;
112 buf->port = port;
113 buf->flags = SAA7164_BUFFER_FREE;
114 buf->pos = 0;
115 buf->actual_size = params->pitch * params->numberoflines;
116 buf->crc = 0;
117 /* TODO: arg len is being ignored */
118 buf->pci_size = SAA7164_PT_ENTRIES * 0x1000;
119 buf->pt_size = (SAA7164_PT_ENTRIES * sizeof(u64)) + 0x1000;
120
121 /* Allocate contiguous memory */
122 buf->cpu = pci_alloc_consistent(port->dev->pci, buf->pci_size,
123 &buf->dma);
124 if (!buf->cpu)
125 goto fail1;
126
127 buf->pt_cpu = pci_alloc_consistent(port->dev->pci, buf->pt_size,
128 &buf->pt_dma);
129 if (!buf->pt_cpu)
130 goto fail2;
131
132 /* init the buffers to a known pattern, easier during debugging */
133 memset_io(buf->cpu, 0xff, buf->pci_size);
134 buf->crc = crc32(0, buf->cpu, buf->actual_size);
135 memset_io(buf->pt_cpu, 0xff, buf->pt_size);
136
137 dprintk(DBGLVL_BUF, "%s() allocated buffer @ 0x%p (%d pageptrs)\n",
138 __func__, buf, params->numpagetables);
139 dprintk(DBGLVL_BUF, " pci_cpu @ 0x%p dma @ 0x%08lx len = 0x%x\n",
140 buf->cpu, (long)buf->dma, buf->pci_size);
141 dprintk(DBGLVL_BUF, " pt_cpu @ 0x%p pt_dma @ 0x%08lx len = 0x%x\n",
142 buf->pt_cpu, (long)buf->pt_dma, buf->pt_size);
143
144 /* Format the Page Table Entries to point into the data buffer */
145 for (i = 0 ; i < params->numpagetables; i++) {
146
147 *(buf->pt_cpu + i) = buf->dma + (i * 0x1000); /* TODO */
148 dprintk(DBGLVL_BUF, " pt[%02d] = 0x%p -> 0x%llx\n",
149 i, buf->pt_cpu, (u64)*(buf->pt_cpu));
150
151 }
152
153 goto ret;
154
155 fail2:
156 pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
157 fail1:
158 kfree(buf);
159
160 buf = NULL;
161 ret:
162 return buf;
163 }
164
165 int saa7164_buffer_dealloc(struct saa7164_buffer *buf)
166 {
167 struct saa7164_dev *dev;
168
169 if (!buf || !buf->port)
170 return SAA_ERR_BAD_PARAMETER;
171 dev = buf->port->dev;
172
173 dprintk(DBGLVL_BUF, "%s() deallocating buffer @ 0x%p\n",
174 __func__, buf);
175
176 if (buf->flags != SAA7164_BUFFER_FREE)
177 log_warn(" freeing a non-free buffer\n");
178
179 pci_free_consistent(dev->pci, buf->pci_size, buf->cpu, buf->dma);
180 pci_free_consistent(dev->pci, buf->pt_size, buf->pt_cpu, buf->pt_dma);
181
182 kfree(buf);
183
184 return SAA_OK;
185 }
186
187 int saa7164_buffer_zero_offsets(struct saa7164_port *port, int i)
188 {
189 struct saa7164_dev *dev = port->dev;
190
191 if ((i < 0) || (i >= port->hwcfg.buffercount))
192 return -EINVAL;
193
194 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
195
196 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
197
198 return 0;
199 }
200
201 /* Write a buffer into the hardware */
202 int saa7164_buffer_activate(struct saa7164_buffer *buf, int i)
203 {
204 struct saa7164_port *port = buf->port;
205 struct saa7164_dev *dev = port->dev;
206
207 if ((i < 0) || (i >= port->hwcfg.buffercount))
208 return -EINVAL;
209
210 dprintk(DBGLVL_BUF, "%s(idx = %d)\n", __func__, i);
211
212 buf->idx = i; /* Note of which buffer list index position we occupy */
213 buf->flags = SAA7164_BUFFER_BUSY;
214 buf->pos = 0;
215
216 /* TODO: Review this in light of 32v64 assignments */
217 saa7164_writel(port->bufoffset + (sizeof(u32) * i), 0);
218 saa7164_writel(port->bufptr32h + ((sizeof(u32) * 2) * i), buf->pt_dma);
219 saa7164_writel(port->bufptr32l + ((sizeof(u32) * 2) * i), 0);
220
221 dprintk(DBGLVL_BUF, " buf[%d] offset 0x%llx (0x%x) "
222 "buf 0x%llx/%llx (0x%x/%x) nr=%d\n",
223 buf->idx,
224 (u64)port->bufoffset + (i * sizeof(u32)),
225 saa7164_readl(port->bufoffset + (sizeof(u32) * i)),
226 (u64)port->bufptr32h + ((sizeof(u32) * 2) * i),
227 (u64)port->bufptr32l + ((sizeof(u32) * 2) * i),
228 saa7164_readl(port->bufptr32h + ((sizeof(u32) * i) * 2)),
229 saa7164_readl(port->bufptr32l + ((sizeof(u32) * i) * 2)),
230 buf->idx);
231
232 return 0;
233 }
234
235 int saa7164_buffer_cfg_port(struct saa7164_port *port)
236 {
237 struct tmHWStreamParameters *params = &port->hw_streamingparams;
238 struct saa7164_dev *dev = port->dev;
239 struct saa7164_buffer *buf;
240 struct list_head *c, *n;
241 int i = 0;
242
243 dprintk(DBGLVL_BUF, "%s(port=%d)\n", __func__, port->nr);
244
245 saa7164_writel(port->bufcounter, 0);
246 saa7164_writel(port->pitch, params->pitch);
247 saa7164_writel(port->bufsize, params->pitch * params->numberoflines);
248
249 dprintk(DBGLVL_BUF, " configured:\n");
250 dprintk(DBGLVL_BUF, " lmmio 0x%p\n", dev->lmmio);
251 dprintk(DBGLVL_BUF, " bufcounter 0x%x = 0x%x\n", port->bufcounter,
252 saa7164_readl(port->bufcounter));
253
254 dprintk(DBGLVL_BUF, " pitch 0x%x = %d\n", port->pitch,
255 saa7164_readl(port->pitch));
256
257 dprintk(DBGLVL_BUF, " bufsize 0x%x = %d\n", port->bufsize,
258 saa7164_readl(port->bufsize));
259
260 dprintk(DBGLVL_BUF, " buffercount = %d\n", port->hwcfg.buffercount);
261 dprintk(DBGLVL_BUF, " bufoffset = 0x%x\n", port->bufoffset);
262 dprintk(DBGLVL_BUF, " bufptr32h = 0x%x\n", port->bufptr32h);
263 dprintk(DBGLVL_BUF, " bufptr32l = 0x%x\n", port->bufptr32l);
264
265 /* Poke the buffers and offsets into PCI space */
266 mutex_lock(&port->dmaqueue_lock);
267 list_for_each_safe(c, n, &port->dmaqueue.list) {
268 buf = list_entry(c, struct saa7164_buffer, list);
269
270 if (buf->flags != SAA7164_BUFFER_FREE)
271 BUG();
272
273 /* Place the buffer in the h/w queue */
274 saa7164_buffer_activate(buf, i);
275
276 /* Don't exceed the device maximum # bufs */
277 if (i++ > port->hwcfg.buffercount)
278 BUG();
279
280 }
281 mutex_unlock(&port->dmaqueue_lock);
282
283 return 0;
284 }
285
286 struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev,
287 u32 len)
288 {
289 struct saa7164_user_buffer *buf;
290
291 buf = kzalloc(sizeof(struct saa7164_user_buffer), GFP_KERNEL);
292 if (!buf)
293 return NULL;
294
295 buf->data = kzalloc(len, GFP_KERNEL);
296
297 if (!buf->data) {
298 kfree(buf);
299 return NULL;
300 }
301
302 buf->actual_size = len;
303 buf->pos = 0;
304 buf->crc = 0;
305
306 dprintk(DBGLVL_BUF, "%s() allocated user buffer @ 0x%p\n",
307 __func__, buf);
308
309 return buf;
310 }
311
312 void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf)
313 {
314 if (!buf)
315 return;
316
317 kfree(buf->data);
318 buf->data = NULL;
319
320 kfree(buf);
321 }
322
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