summaryrefslogtreecommitdiff
path: root/sound/firewire/dice/dice-transaction.c
blob: a4ff4e0bc0af1ad143471624df0c00a89eca27c4 (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
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
/*
 * dice_transaction.c - a part of driver for Dice based devices
 *
 * Copyright (c) Clemens Ladisch
 * Copyright (c) 2014 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include "dice.h"

#define NOTIFICATION_TIMEOUT_MS	(2 * MSEC_PER_SEC)

static u64 get_subaddr(struct snd_dice *dice, enum snd_dice_addr_type type,
		       u64 offset)
{
	switch (type) {
	case SND_DICE_ADDR_TYPE_TX:
		offset += dice->tx_offset;
		break;
	case SND_DICE_ADDR_TYPE_RX:
		offset += dice->rx_offset;
		break;
	case SND_DICE_ADDR_TYPE_SYNC:
		offset += dice->sync_offset;
		break;
	case SND_DICE_ADDR_TYPE_RSRV:
		offset += dice->rsrv_offset;
		break;
	case SND_DICE_ADDR_TYPE_GLOBAL:
	default:
		offset += dice->global_offset;
		break;
	}
	offset += DICE_PRIVATE_SPACE;
	return offset;
}

int snd_dice_transaction_write(struct snd_dice *dice,
			       enum snd_dice_addr_type type,
			       unsigned int offset, void *buf, unsigned int len)
{
	return snd_fw_transaction(dice->unit,
				  (len == 4) ? TCODE_WRITE_QUADLET_REQUEST :
					       TCODE_WRITE_BLOCK_REQUEST,
				  get_subaddr(dice, type, offset), buf, len, 0);
}

int snd_dice_transaction_read(struct snd_dice *dice,
			      enum snd_dice_addr_type type, unsigned int offset,
			      void *buf, unsigned int len)
{
	return snd_fw_transaction(dice->unit,
				  (len == 4) ? TCODE_READ_QUADLET_REQUEST :
					       TCODE_READ_BLOCK_REQUEST,
				  get_subaddr(dice, type, offset), buf, len, 0);
}

static unsigned int get_clock_info(struct snd_dice *dice, __be32 *info)
{
	return snd_dice_transaction_read_global(dice, GLOBAL_CLOCK_SELECT,
						info, 4);
}

static int set_clock_info(struct snd_dice *dice,
			  unsigned int rate, unsigned int source)
{
	unsigned int i;
	__be32 info;
	u32 mask;
	u32 clock;
	int err;

	err = get_clock_info(dice, &info);
	if (err < 0)
		return err;

	clock = be32_to_cpu(info);
	if (source != UINT_MAX) {
		mask = CLOCK_SOURCE_MASK;
		clock &= ~mask;
		clock |= source;
	}
	if (rate != UINT_MAX) {
		for (i = 0; i < ARRAY_SIZE(snd_dice_rates); i++) {
			if (snd_dice_rates[i] == rate)
				break;
		}
		if (i == ARRAY_SIZE(snd_dice_rates))
			return -EINVAL;

		mask = CLOCK_RATE_MASK;
		clock &= ~mask;
		clock |= i << CLOCK_RATE_SHIFT;
	}
	info = cpu_to_be32(clock);

	if (completion_done(&dice->clock_accepted))
		reinit_completion(&dice->clock_accepted);

	err = snd_dice_transaction_write_global(dice, GLOBAL_CLOCK_SELECT,
						&info, 4);
	if (err < 0)
		return err;

	if (wait_for_completion_timeout(&dice->clock_accepted,
			msecs_to_jiffies(NOTIFICATION_TIMEOUT_MS)) == 0)
		return -ETIMEDOUT;

	return 0;
}

int snd_dice_transaction_get_clock_source(struct snd_dice *dice,
					  unsigned int *source)
{
	__be32 info;
	int err;

	err = get_clock_info(dice, &info);
	if (err >= 0)
		*source = be32_to_cpu(info) & CLOCK_SOURCE_MASK;

	return err;
}

int snd_dice_transaction_get_rate(struct snd_dice *dice, unsigned int *rate)
{
	__be32 info;
	unsigned int index;
	int err;

	err = get_clock_info(dice, &info);
	if (err < 0)
		goto end;

	index = (be32_to_cpu(info) & CLOCK_RATE_MASK) >> CLOCK_RATE_SHIFT;
	if (index >= SND_DICE_RATES_COUNT) {
		err = -ENOSYS;
		goto end;
	}

	*rate = snd_dice_rates[index];
end:
	return err;
}
int snd_dice_transaction_set_rate(struct snd_dice *dice, unsigned int rate)
{
	return set_clock_info(dice, rate, UINT_MAX);
}

int snd_dice_transaction_set_enable(struct snd_dice *dice)
{
	__be32 value;
	int err = 0;

	if (dice->global_enabled)
		goto end;

	value = cpu_to_be32(1);
	err = snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
				 get_subaddr(dice, SND_DICE_ADDR_TYPE_GLOBAL,
					     GLOBAL_ENABLE),
				 &value, 4,
				 FW_FIXED_GENERATION | dice->owner_generation);
	if (err < 0)
		goto end;

	dice->global_enabled = true;
end:
	return err;
}

void snd_dice_transaction_clear_enable(struct snd_dice *dice)
{
	__be32 value;

	value = 0;
	snd_fw_transaction(dice->unit, TCODE_WRITE_QUADLET_REQUEST,
			   get_subaddr(dice, SND_DICE_ADDR_TYPE_GLOBAL,
				       GLOBAL_ENABLE),
			   &value, 4, FW_QUIET |
			   FW_FIXED_GENERATION | dice->owner_generation);

	dice->global_enabled = false;
}

static void dice_notification(struct fw_card *card, struct fw_request *request,
			      int tcode, int destination, int source,
			      int generation, unsigned long long offset,
			      void *data, size_t length, void *callback_data)
{
	struct snd_dice *dice = callback_data;
	u32 bits;
	unsigned long flags;

	if (tcode != TCODE_WRITE_QUADLET_REQUEST) {
		fw_send_response(card, request, RCODE_TYPE_ERROR);
		return;
	}
	if ((offset & 3) != 0) {
		fw_send_response(card, request, RCODE_ADDRESS_ERROR);
		return;
	}

	bits = be32_to_cpup(data);

	spin_lock_irqsave(&dice->lock, flags);
	dice->notification_bits |= bits;
	spin_unlock_irqrestore(&dice->lock, flags);

	fw_send_response(card, request, RCODE_COMPLETE);

	if (bits & NOTIFY_CLOCK_ACCEPTED)
		complete(&dice->clock_accepted);
	wake_up(&dice->hwdep_wait);
}

static int register_notification_address(struct snd_dice *dice, bool retry)
{
	struct fw_device *device = fw_parent_device(dice->unit);
	__be64 *buffer;
	unsigned int retries;
	int err;

	retries = (retry) ? 3 : 0;

	buffer = kmalloc(2 * 8, GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	for (;;) {
		buffer[0] = cpu_to_be64(OWNER_NO_OWNER);
		buffer[1] = cpu_to_be64(
			((u64)device->card->node_id << OWNER_NODE_SHIFT) |
			dice->notification_handler.offset);

		dice->owner_generation = device->generation;
		smp_rmb(); /* node_id vs. generation */
		err = snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,
					 get_subaddr(dice,
						     SND_DICE_ADDR_TYPE_GLOBAL,
						     GLOBAL_OWNER),
					 buffer, 2 * 8,
					 FW_FIXED_GENERATION |
							dice->owner_generation);
		if (err == 0) {
			/* success */
			if (buffer[0] == cpu_to_be64(OWNER_NO_OWNER))
				break;
			/* The address seems to be already registered. */
			if (buffer[0] == buffer[1])
				break;

			dev_err(&dice->unit->device,
				"device is already in use\n");
			err = -EBUSY;
		}
		if (err != -EAGAIN || retries-- > 0)
			break;

		msleep(20);
	}

	kfree(buffer);

	if (err < 0)
		dice->owner_generation = -1;

	return err;
}

static void unregister_notification_address(struct snd_dice *dice)
{
	struct fw_device *device = fw_parent_device(dice->unit);
	__be64 *buffer;

	buffer = kmalloc(2 * 8, GFP_KERNEL);
	if (buffer == NULL)
		return;

	buffer[0] = cpu_to_be64(
		((u64)device->card->node_id << OWNER_NODE_SHIFT) |
		dice->notification_handler.offset);
	buffer[1] = cpu_to_be64(OWNER_NO_OWNER);
	snd_fw_transaction(dice->unit, TCODE_LOCK_COMPARE_SWAP,
			   get_subaddr(dice, SND_DICE_ADDR_TYPE_GLOBAL,
				       GLOBAL_OWNER),
			   buffer, 2 * 8, FW_QUIET |
			   FW_FIXED_GENERATION | dice->owner_generation);

	kfree(buffer);

	dice->owner_generation = -1;
}

void snd_dice_transaction_destroy(struct snd_dice *dice)
{
	struct fw_address_handler *handler = &dice->notification_handler;

	if (handler->callback_data == NULL)
		return;

	unregister_notification_address(dice);

	fw_core_remove_address_handler(handler);
	handler->callback_data = NULL;
}

int snd_dice_transaction_reinit(struct snd_dice *dice)
{
	struct fw_address_handler *handler = &dice->notification_handler;

	if (handler->callback_data == NULL)
		return -EINVAL;

	return register_notification_address(dice, false);
}

static int get_subaddrs(struct snd_dice *dice)
{
	static const int min_values[10] = {
		10, 0x64 / 4,
		10, 0x18 / 4,
		10, 0x18 / 4,
		0, 0,
		0, 0,
	};
	__be32 *pointers;
	__be32 version;
	u32 data;
	unsigned int i;
	int err;

	pointers = kmalloc_array(ARRAY_SIZE(min_values), sizeof(__be32),
				 GFP_KERNEL);
	if (pointers == NULL)
		return -ENOMEM;

	/*
	 * Check that the sub address spaces exist and are located inside the
	 * private address space.  The minimum values are chosen so that all
	 * minimally required registers are included.
	 */
	err = snd_fw_transaction(dice->unit, TCODE_READ_BLOCK_REQUEST,
				 DICE_PRIVATE_SPACE, pointers,
				 sizeof(__be32) * ARRAY_SIZE(min_values), 0);
	if (err < 0)
		goto end;

	for (i = 0; i < ARRAY_SIZE(min_values); ++i) {
		data = be32_to_cpu(pointers[i]);
		if (data < min_values[i] || data >= 0x40000) {
			err = -ENODEV;
			goto end;
		}
	}

	/*
	 * Check that the implemented DICE driver specification major version
	 * number matches.
	 */
	err = snd_fw_transaction(dice->unit, TCODE_READ_QUADLET_REQUEST,
				 DICE_PRIVATE_SPACE +
				 be32_to_cpu(pointers[0]) * 4 + GLOBAL_VERSION,
				 &version, sizeof(version), 0);
	if (err < 0)
		goto end;

	if ((version & cpu_to_be32(0xff000000)) != cpu_to_be32(0x01000000)) {
		dev_err(&dice->unit->device,
			"unknown DICE version: 0x%08x\n", be32_to_cpu(version));
		err = -ENODEV;
		goto end;
	}

	dice->global_offset = be32_to_cpu(pointers[0]) * 4;
	dice->tx_offset = be32_to_cpu(pointers[2]) * 4;
	dice->rx_offset = be32_to_cpu(pointers[4]) * 4;
	dice->sync_offset = be32_to_cpu(pointers[6]) * 4;
	dice->rsrv_offset = be32_to_cpu(pointers[8]) * 4;

	/* Set up later. */
	if (be32_to_cpu(pointers[1]) * 4 >= GLOBAL_CLOCK_CAPABILITIES + 4)
		dice->clock_caps = 1;
end:
	kfree(pointers);
	return err;
}

int snd_dice_transaction_init(struct snd_dice *dice)
{
	struct fw_address_handler *handler = &dice->notification_handler;
	int err;

	err = get_subaddrs(dice);
	if (err < 0)
		return err;

	/* Allocation callback in address space over host controller */
	handler->length = 4;
	handler->address_callback = dice_notification;
	handler->callback_data = dice;
	err = fw_core_add_address_handler(handler, &fw_high_memory_region);
	if (err < 0) {
		handler->callback_data = NULL;
		return err;
	}

	/* Register the address space */
	err = register_notification_address(dice, true);
	if (err < 0) {
		fw_core_remove_address_handler(handler);
		handler->callback_data = NULL;
	}

	return err;
}