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
69void 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 */
92struct 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(buf->cpu, 0xff, buf->pci_size);
134	buf->crc = crc32(0, buf->cpu, buf->actual_size);
135	memset(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
155fail2:
156	pci_free_consistent(port->dev->pci, buf->pci_size, buf->cpu, buf->dma);
157fail1:
158	kfree(buf);
159
160	buf = NULL;
161ret:
162	return buf;
163}
164
165int 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
187int 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 */
202int 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
235int 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
286struct 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
312void 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
323