summaryrefslogtreecommitdiffstats
path: root/drivers/media/pci/solo6x10/solo6x10-p2m.c
blob: 46c30430e30bc27d215c9210242f7de4130cd05a (plain)
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
320
321
322
323
324
325
326
/*
 * Copyright (C) 2010-2013 Bluecherry, LLC <http://www.bluecherrydvr.com>
 *
 * Original author:
 * Ben Collins <bcollins@ubuntu.com>
 *
 * Additional work by:
 * John Brooks <john.brooks@bluecherry.net>
 *
 * 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/slab.h>

#include "solo6x10.h"

static int multi_p2m;
module_param(multi_p2m, uint, 0644);
MODULE_PARM_DESC(multi_p2m,
		 "Use multiple P2M DMA channels (default: no, 6010-only)");

static int desc_mode;
module_param(desc_mode, uint, 0644);
MODULE_PARM_DESC(desc_mode,
		 "Allow use of descriptor mode DMA (default: no, 6010-only)");

int solo_p2m_dma(struct solo_dev *solo_dev, int wr,
		 void *sys_addr, u32 ext_addr, u32 size,
		 int repeat, u32 ext_size)
{
	dma_addr_t dma_addr;
	int ret;

	if (WARN_ON_ONCE((unsigned long)sys_addr & 0x03))
		return -EINVAL;
	if (WARN_ON_ONCE(!size))
		return -EINVAL;

	dma_addr = pci_map_single(solo_dev->pdev, sys_addr, size,
				  wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);
	if (pci_dma_mapping_error(solo_dev->pdev, dma_addr))
		return -ENOMEM;

	ret = solo_p2m_dma_t(solo_dev, wr, dma_addr, ext_addr, size,
			     repeat, ext_size);

	pci_unmap_single(solo_dev->pdev, dma_addr, size,
			 wr ? PCI_DMA_TODEVICE : PCI_DMA_FROMDEVICE);

	return ret;
}

/* Mutex must be held for p2m_id before calling this!! */
int solo_p2m_dma_desc(struct solo_dev *solo_dev,
		      struct solo_p2m_desc *desc, dma_addr_t desc_dma,
		      int desc_cnt)
{
	struct solo_p2m_dev *p2m_dev;
	unsigned int timeout;
	unsigned int config = 0;
	int ret = 0;
	unsigned int p2m_id = 0;

	/* Get next ID. According to Softlogic, 6110 has problems on !=0 P2M */
	if (solo_dev->type != SOLO_DEV_6110 && multi_p2m)
		p2m_id = atomic_inc_return(&solo_dev->p2m_count) % SOLO_NR_P2M;

	p2m_dev = &solo_dev->p2m_dev[p2m_id];

	if (mutex_lock_interruptible(&p2m_dev->mutex))
		return -EINTR;

	reinit_completion(&p2m_dev->completion);
	p2m_dev->error = 0;

	if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && desc_mode) {
		/* For 6010 with more than one desc, we can do a one-shot */
		p2m_dev->desc_count = p2m_dev->desc_idx = 0;
		config = solo_reg_read(solo_dev, SOLO_P2M_CONFIG(p2m_id));

		solo_reg_write(solo_dev, SOLO_P2M_DES_ADR(p2m_id), desc_dma);
		solo_reg_write(solo_dev, SOLO_P2M_DESC_ID(p2m_id), desc_cnt);
		solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config |
			       SOLO_P2M_DESC_MODE);
	} else {
		/* For single descriptors and 6110, we need to run each desc */
		p2m_dev->desc_count = desc_cnt;
		p2m_dev->desc_idx = 1;
		p2m_dev->descs = desc;

		solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(p2m_id),
			       desc[1].dma_addr);
		solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(p2m_id),
			       desc[1].ext_addr);
		solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(p2m_id),
			       desc[1].cfg);
		solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id),
			       desc[1].ctrl);
	}

	timeout = wait_for_completion_timeout(&p2m_dev->completion,
					      solo_dev->p2m_jiffies);

	if (WARN_ON_ONCE(p2m_dev->error))
		ret = -EIO;
	else if (timeout == 0) {
		solo_dev->p2m_timeouts++;
		ret = -EAGAIN;
	}

	solo_reg_write(solo_dev, SOLO_P2M_CONTROL(p2m_id), 0);

	/* Don't write here for the no_desc_mode case, because config is 0.
	 * We can't test no_desc_mode again, it might race. */
	if (desc_cnt > 1 && solo_dev->type != SOLO_DEV_6110 && config)
		solo_reg_write(solo_dev, SOLO_P2M_CONFIG(p2m_id), config);

	mutex_unlock(&p2m_dev->mutex);

	return ret;
}

void solo_p2m_fill_desc(struct solo_p2m_desc *desc, int wr,
			dma_addr_t dma_addr, u32 ext_addr, u32 size,
			int repeat, u32 ext_size)
{
	WARN_ON_ONCE(dma_addr & 0x03);
	WARN_ON_ONCE(!size);

	desc->cfg = SOLO_P2M_COPY_SIZE(size >> 2);
	desc->ctrl = SOLO_P2M_BURST_SIZE(SOLO_P2M_BURST_256) |
		(wr ? SOLO_P2M_WRITE : 0) | SOLO_P2M_TRANS_ON;

	if (repeat) {
		desc->cfg |= SOLO_P2M_EXT_INC(ext_size >> 2);
		desc->ctrl |=  SOLO_P2M_PCI_INC(size >> 2) |
			 SOLO_P2M_REPEAT(repeat);
	}

	desc->dma_addr = dma_addr;
	desc->ext_addr = ext_addr;
}

int solo_p2m_dma_t(struct solo_dev *solo_dev, int wr,
		   dma_addr_t dma_addr, u32 ext_addr, u32 size,
		   int repeat, u32 ext_size)
{
	struct solo_p2m_desc desc[2];

	solo_p2m_fill_desc(&desc[1], wr, dma_addr, ext_addr, size, repeat,
			   ext_size);

	/* No need for desc_dma since we know it is a single-shot */
	return solo_p2m_dma_desc(solo_dev, desc, 0, 1);
}

void solo_p2m_isr(struct solo_dev *solo_dev, int id)
{
	struct solo_p2m_dev *p2m_dev = &solo_dev->p2m_dev[id];
	struct solo_p2m_desc *desc;

	if (p2m_dev->desc_count <= p2m_dev->desc_idx) {
		complete(&p2m_dev->completion);
		return;
	}

	/* Setup next descriptor */
	p2m_dev->desc_idx++;
	desc = &p2m_dev->descs[p2m_dev->desc_idx];

	solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), 0);
	solo_reg_write(solo_dev, SOLO_P2M_TAR_ADR(id), desc->dma_addr);
	solo_reg_write(solo_dev, SOLO_P2M_EXT_ADR(id), desc->ext_addr);
	solo_reg_write(solo_dev, SOLO_P2M_EXT_CFG(id), desc->cfg);
	solo_reg_write(solo_dev, SOLO_P2M_CONTROL(id), desc->ctrl);
}

void solo_p2m_error_isr(struct solo_dev *solo_dev)
{
	unsigned int err = solo_reg_read(solo_dev, SOLO_PCI_ERR);
	struct solo_p2m_dev *p2m_dev;
	int i;

	if (!(err & (SOLO_PCI_ERR_P2M | SOLO_PCI_ERR_P2M_DESC)))
		return;

	for (i = 0; i < SOLO_NR_P2M; i++) {
		p2m_dev = &solo_dev->p2m_dev[i];
		p2m_dev->error = 1;
		solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
		complete(&p2m_dev->completion);
	}
}

void solo_p2m_exit(struct solo_dev *solo_dev)
{
	int i;

	for (i = 0; i < SOLO_NR_P2M; i++)
		solo_irq_off(solo_dev, SOLO_IRQ_P2M(i));
}

static int solo_p2m_test(struct solo_dev *solo_dev, int base, int size)
{
	u32 *wr_buf;
	u32 *rd_buf;
	int i;
	int ret = -EIO;
	int order = get_order(size);

	wr_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
	if (wr_buf == NULL)
		return -1;

	rd_buf = (u32 *)__get_free_pages(GFP_KERNEL, order);
	if (rd_buf == NULL) {
		free_pages((unsigned long)wr_buf, order);
		return -1;
	}

	for (i = 0; i < (size >> 3); i++)
		*(wr_buf + i) = (i << 16) | (i + 1);

	for (i = (size >> 3); i < (size >> 2); i++)
		*(wr_buf + i) = ~((i << 16) | (i + 1));

	memset(rd_buf, 0x55, size);

	if (solo_p2m_dma(solo_dev, 1, wr_buf, base, size, 0, 0))
		goto test_fail;

	if (solo_p2m_dma(solo_dev, 0, rd_buf, base, size, 0, 0))
		goto test_fail;

	for (i = 0; i < (size >> 2); i++) {
		if (*(wr_buf + i) != *(rd_buf + i))
			goto test_fail;
	}

	ret = 0;

test_fail:
	free_pages((unsigned long)wr_buf, order);
	free_pages((unsigned long)rd_buf, order);

	return ret;
}

int solo_p2m_init(struct solo_dev *solo_dev)
{
	struct solo_p2m_dev *p2m_dev;
	int i;

	for (i = 0; i < SOLO_NR_P2M; i++) {
		p2m_dev = &solo_dev->p2m_dev[i];

		mutex_init(&p2m_dev->mutex);
		init_completion(&p2m_dev->completion);

		solo_reg_write(solo_dev, SOLO_P2M_CONTROL(i), 0);
		solo_reg_write(solo_dev, SOLO_P2M_CONFIG(i),
			       SOLO_P2M_CSC_16BIT_565 |
			       SOLO_P2M_DESC_INTR_OPT |
			       SOLO_P2M_DMA_INTERVAL(0) |
			       SOLO_P2M_PCI_MASTER_MODE);
		solo_irq_on(solo_dev, SOLO_IRQ_P2M(i));
	}

	/* Find correct SDRAM size */
	for (solo_dev->sdram_size = 0, i = 2; i >= 0; i--) {
		solo_reg_write(solo_dev, SOLO_DMA_CTRL,
			       SOLO_DMA_CTRL_REFRESH_CYCLE(1) |
			       SOLO_DMA_CTRL_SDRAM_SIZE(i) |
			       SOLO_DMA_CTRL_SDRAM_CLK_INVERT |
			       SOLO_DMA_CTRL_READ_CLK_SELECT |
			       SOLO_DMA_CTRL_LATENCY(1));

		solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config |
			       SOLO_SYS_CFG_RESET);
		solo_reg_write(solo_dev, SOLO_SYS_CFG, solo_dev->sys_config);

		switch (i) {
		case 2:
			if (solo_p2m_test(solo_dev, 0x07ff0000, 0x00010000) ||
			    solo_p2m_test(solo_dev, 0x05ff0000, 0x00010000))
				continue;
			break;

		case 1:
			if (solo_p2m_test(solo_dev, 0x03ff0000, 0x00010000))
				continue;
			break;

		default:
			if (solo_p2m_test(solo_dev, 0x01ff0000, 0x00010000))
				continue;
		}

		solo_dev->sdram_size = (32 << 20) << i;
		break;
	}

	if (!solo_dev->sdram_size) {
		dev_err(&solo_dev->pdev->dev, "Error detecting SDRAM size\n");
		return -EIO;
	}

	if (SOLO_SDRAM_END(solo_dev) > solo_dev->sdram_size) {
		dev_err(&solo_dev->pdev->dev,
			"SDRAM is not large enough (%u < %u)\n",
			solo_dev->sdram_size, SOLO_SDRAM_END(solo_dev));
		return -EIO;
	}

	return 0;
}