aboutsummaryrefslogtreecommitdiffstats
path: root/sound/soc/blackfin/bf6xx-sport.c
blob: 318c5ba5360f6dfb3e9184aa9f169ad0f23aa3a4 (plain) (blame)
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
418
419
420
421
422
/*
 * bf6xx_sport.c Analog Devices BF6XX SPORT driver
 *
 * Copyright (c) 2012 Analog Devices Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/device.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <asm/blackfin.h>
#include <asm/dma.h>
#include <asm/portmux.h>

#include "bf6xx-sport.h"

int sport_set_tx_params(struct sport_device *sport,
			struct sport_params *params)
{
	if (sport->tx_regs->spctl & SPORT_CTL_SPENPRI)
		return -EBUSY;
	sport->tx_regs->spctl = params->spctl | SPORT_CTL_SPTRAN;
	sport->tx_regs->div = params->div;
	SSYNC();
	return 0;
}
EXPORT_SYMBOL(sport_set_tx_params);

int sport_set_rx_params(struct sport_device *sport,
			struct sport_params *params)
{
	if (sport->rx_regs->spctl & SPORT_CTL_SPENPRI)
		return -EBUSY;
	sport->rx_regs->spctl = params->spctl & ~SPORT_CTL_SPTRAN;
	sport->rx_regs->div = params->div;
	SSYNC();
	return 0;
}
EXPORT_SYMBOL(sport_set_rx_params);

static int compute_wdsize(size_t wdsize)
{
	switch (wdsize) {
	case 1:
		return WDSIZE_8 | PSIZE_8;
	case 2:
		return WDSIZE_16 | PSIZE_16;
	default:
		return WDSIZE_32 | PSIZE_32;
	}
}

void sport_tx_start(struct sport_device *sport)
{
	set_dma_next_desc_addr(sport->tx_dma_chan, sport->tx_desc);
	set_dma_config(sport->tx_dma_chan, DMAFLOW_LIST | DI_EN
			| compute_wdsize(sport->wdsize) | NDSIZE_6);
	enable_dma(sport->tx_dma_chan);
	sport->tx_regs->spctl |= SPORT_CTL_SPENPRI;
	SSYNC();
}
EXPORT_SYMBOL(sport_tx_start);

void sport_rx_start(struct sport_device *sport)
{
	set_dma_next_desc_addr(sport->rx_dma_chan, sport->rx_desc);
	set_dma_config(sport->rx_dma_chan, DMAFLOW_LIST | DI_EN | WNR
			| compute_wdsize(sport->wdsize) | NDSIZE_6);
	enable_dma(sport->rx_dma_chan);
	sport->rx_regs->spctl |= SPORT_CTL_SPENPRI;
	SSYNC();
}
EXPORT_SYMBOL(sport_rx_start);

void sport_tx_stop(struct sport_device *sport)
{
	sport->tx_regs->spctl &= ~SPORT_CTL_SPENPRI;
	SSYNC();
	disable_dma(sport->tx_dma_chan);
}
EXPORT_SYMBOL(sport_tx_stop);

void sport_rx_stop(struct sport_device *sport)
{
	sport->rx_regs->spctl &= ~SPORT_CTL_SPENPRI;
	SSYNC();
	disable_dma(sport->rx_dma_chan);
}
EXPORT_SYMBOL(sport_rx_stop);

void sport_set_tx_callback(struct sport_device *sport,
		void (*tx_callback)(void *), void *tx_data)
{
	sport->tx_callback = tx_callback;
	sport->tx_data = tx_data;
}
EXPORT_SYMBOL(sport_set_tx_callback);

void sport_set_rx_callback(struct sport_device *sport,
		void (*rx_callback)(void *), void *rx_data)
{
	sport->rx_callback = rx_callback;
	sport->rx_data = rx_data;
}
EXPORT_SYMBOL(sport_set_rx_callback);

static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
		size_t fragsize, unsigned int cfg,
		unsigned int count, size_t wdsize)
{

	int i;

	for (i = 0; i < fragcount; ++i) {
		desc[i].next_desc_addr  = &(desc[i + 1]);
		desc[i].start_addr = (unsigned long)buf + i*fragsize;
		desc[i].cfg = cfg;
		desc[i].x_count = count;
		desc[i].x_modify = wdsize;
		desc[i].y_count = 0;
		desc[i].y_modify = 0;
	}

	/* make circular */
	desc[fragcount-1].next_desc_addr = desc;
}

int sport_config_tx_dma(struct sport_device *sport, void *buf,
		int fragcount, size_t fragsize)
{
	unsigned int count;
	unsigned int cfg;
	dma_addr_t addr;

	count = fragsize/sport->wdsize;

	if (sport->tx_desc)
		dma_free_coherent(NULL, sport->tx_desc_size,
				sport->tx_desc, 0);

	sport->tx_desc = dma_alloc_coherent(NULL,
			fragcount * sizeof(struct dmasg), &addr, 0);
	sport->tx_desc_size = fragcount * sizeof(struct dmasg);
	if (!sport->tx_desc)
		return -ENOMEM;

	sport->tx_buf = buf;
	sport->tx_fragsize = fragsize;
	sport->tx_frags = fragcount;
	cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize) | NDSIZE_6;

	setup_desc(sport->tx_desc, buf, fragcount, fragsize,
			cfg|DMAEN, count, sport->wdsize);

	return 0;
}
EXPORT_SYMBOL(sport_config_tx_dma);

int sport_config_rx_dma(struct sport_device *sport, void *buf,
		int fragcount, size_t fragsize)
{
	unsigned int count;
	unsigned int cfg;
	dma_addr_t addr;

	count = fragsize/sport->wdsize;

	if (sport->rx_desc)
		dma_free_coherent(NULL, sport->rx_desc_size,
				sport->rx_desc, 0);

	sport->rx_desc = dma_alloc_coherent(NULL,
			fragcount * sizeof(struct dmasg), &addr, 0);
	sport->rx_desc_size = fragcount * sizeof(struct dmasg);
	if (!sport->rx_desc)
		return -ENOMEM;

	sport->rx_buf = buf;
	sport->rx_fragsize = fragsize;
	sport->rx_frags = fragcount;
	cfg = DMAFLOW_LIST | DI_EN | compute_wdsize(sport->wdsize)
		| WNR | NDSIZE_6;

	setup_desc(sport->rx_desc, buf, fragcount, fragsize,
			cfg|DMAEN, count, sport->wdsize);

	return 0;
}
EXPORT_SYMBOL(sport_config_rx_dma);

unsigned long sport_curr_offset_tx(struct sport_device *sport)
{
	unsigned long curr = get_dma_curr_addr(sport->tx_dma_chan);

	return (unsigned char *)curr - sport->tx_buf;
}
EXPORT_SYMBOL(sport_curr_offset_tx);

unsigned long sport_curr_offset_rx(struct sport_device *sport)
{
	unsigned long curr = get_dma_curr_addr(sport->rx_dma_chan);

	return (unsigned char *)curr - sport->rx_buf;
}
EXPORT_SYMBOL(sport_curr_offset_rx);

static irqreturn_t sport_tx_irq(int irq, void *dev_id)
{
	struct sport_device *sport = dev_id;
	static unsigned long status;

	status = get_dma_curr_irqstat(sport->tx_dma_chan);
	if (status & (DMA_DONE|DMA_ERR)) {
		clear_dma_irqstat(sport->tx_dma_chan);
		SSYNC();
	}
	if (sport->tx_callback)
		sport->tx_callback(sport->tx_data);
	return IRQ_HANDLED;
}

static irqreturn_t sport_rx_irq(int irq, void *dev_id)
{
	struct sport_device *sport = dev_id;
	unsigned long status;

	status = get_dma_curr_irqstat(sport->rx_dma_chan);
	if (status & (DMA_DONE|DMA_ERR)) {
		clear_dma_irqstat(sport->rx_dma_chan);
		SSYNC();
	}
	if (sport->rx_callback)
		sport->rx_callback(sport->rx_data);
	return IRQ_HANDLED;
}

static irqreturn_t sport_err_irq(int irq, void *dev_id)
{
	struct sport_device *sport = dev_id;
	struct device *dev = &sport->pdev->dev;

	if (sport->tx_regs->spctl & SPORT_CTL_DERRPRI)
		dev_err(dev, "sport error: TUVF\n");
	if (sport->rx_regs->spctl & SPORT_CTL_DERRPRI)
		dev_err(dev, "sport error: ROVF\n");

	return IRQ_HANDLED;
}

static int sport_get_resource(struct sport_device *sport)
{
	struct platform_device *pdev = sport->pdev;
	struct device *dev = &pdev->dev;
	struct bfin_snd_platform_data *pdata = dev->platform_data;
	struct resource *res;

	if (!pdata) {
		dev_err(dev, "No platform data\n");
		return -ENODEV;
	}
	sport->pin_req = pdata->pin_req;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(dev, "No tx MEM resource\n");
		return -ENODEV;
	}
	sport->tx_regs = (struct sport_register *)res->start;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (!res) {
		dev_err(dev, "No rx MEM resource\n");
		return -ENODEV;
	}
	sport->rx_regs = (struct sport_register *)res->start;

	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
	if (!res) {
		dev_err(dev, "No tx DMA resource\n");
		return -ENODEV;
	}
	sport->tx_dma_chan = res->start;

	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
	if (!res) {
		dev_err(dev, "No rx DMA resource\n");
		return -ENODEV;
	}
	sport->rx_dma_chan = res->start;

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	if (!res) {
		dev_err(dev, "No tx error irq resource\n");
		return -ENODEV;
	}
	sport->tx_err_irq = res->start;

	res = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
	if (!res) {
		dev_err(dev, "No rx error irq resource\n");
		return -ENODEV;
	}
	sport->rx_err_irq = res->start;

	return 0;
}

static int sport_request_resource(struct sport_device *sport)
{
	struct device *dev = &sport->pdev->dev;
	int ret;

	ret = peripheral_request_list(sport->pin_req, "soc-audio");
	if (ret) {
		dev_err(dev, "Unable to request sport pin\n");
		return ret;
	}

	ret = request_dma(sport->tx_dma_chan, "SPORT TX Data");
	if (ret) {
		dev_err(dev, "Unable to allocate DMA channel for sport tx\n");
		goto err_tx_dma;
	}
	set_dma_callback(sport->tx_dma_chan, sport_tx_irq, sport);

	ret = request_dma(sport->rx_dma_chan, "SPORT RX Data");
	if (ret) {
		dev_err(dev, "Unable to allocate DMA channel for sport rx\n");
		goto err_rx_dma;
	}
	set_dma_callback(sport->rx_dma_chan, sport_rx_irq, sport);

	ret = request_irq(sport->tx_err_irq, sport_err_irq,
			0, "SPORT TX ERROR", sport);
	if (ret) {
		dev_err(dev, "Unable to allocate tx error IRQ for sport\n");
		goto err_tx_irq;
	}

	ret = request_irq(sport->rx_err_irq, sport_err_irq,
			0, "SPORT RX ERROR", sport);
	if (ret) {
		dev_err(dev, "Unable to allocate rx error IRQ for sport\n");
		goto err_rx_irq;
	}

	return 0;
err_rx_irq:
	free_irq(sport->tx_err_irq, sport);
err_tx_irq:
	free_dma(sport->rx_dma_chan);
err_rx_dma:
	free_dma(sport->tx_dma_chan);
err_tx_dma:
	peripheral_free_list(sport->pin_req);
	return ret;
}

static void sport_free_resource(struct sport_device *sport)
{
	free_irq(sport->rx_err_irq, sport);
	free_irq(sport->tx_err_irq, sport);
	free_dma(sport->rx_dma_chan);
	free_dma(sport->tx_dma_chan);
	peripheral_free_list(sport->pin_req);
}

struct sport_device *sport_create(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct sport_device *sport;
	int ret;

	sport = kzalloc(sizeof(*sport), GFP_KERNEL);
	if (!sport) {
		dev_err(dev, "Unable to allocate memory for sport device\n");
		return NULL;
	}
	sport->pdev = pdev;

	ret = sport_get_resource(sport);
	if (ret) {
		kfree(sport);
		return NULL;
	}

	ret = sport_request_resource(sport);
	if (ret) {
		kfree(sport);
		return NULL;
	}

	dev_dbg(dev, "SPORT create success\n");
	return sport;
}
EXPORT_SYMBOL(sport_create);

void sport_delete(struct sport_device *sport)
{
	sport_free_resource(sport);
}
EXPORT_SYMBOL(sport_delete);

MODULE_DESCRIPTION("Analog Devices BF6XX SPORT driver");
MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
MODULE_LICENSE("GPL v2");