summaryrefslogtreecommitdiff
path: root/sound/soc/blackfin/bf5xx-ac97.c
blob: 8e41bcb020eb5beba44505b7df5c1cfae0ee64e0 (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
/*
 * bf5xx-ac97.c -- AC97 support for the ADI blackfin chip.
 *
 * Author:	Roy Huang
 * Created:	11th. June 2007
 * Copyright:	Analog Device 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.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/slab.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include <asm/irq.h>
#include <asm/portmux.h>
#include <linux/mutex.h>
#include <linux/gpio.h>

#include "bf5xx-sport.h"
#include "bf5xx-ac97.h"

/* Anomaly notes:
 *  05000250 -	AD1980 is running in TDM mode and RFS/TFS are generated by SPORT
 *		contrtoller. But, RFSDIV and TFSDIV are always set to 16*16-1,
 *		while the max AC97 data size is 13*16. The DIV is always larger
 *		than data size. AD73311 and ad2602 are not running in TDM mode.
 *		AD1836 and AD73322 depend on external RFS/TFS only. So, this
 *		anomaly does not affect blackfin sound drivers.
*/

static struct sport_device *ac97_sport_handle;

void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src,
		size_t count, unsigned int chan_mask)
{
	while (count--) {
		dst->ac97_tag = TAG_VALID;
		if (chan_mask & SP_FL) {
			dst->ac97_pcm_r = *src++;
			dst->ac97_tag |= TAG_PCM_RIGHT;
		}
		if (chan_mask & SP_FR) {
			dst->ac97_pcm_l = *src++;
			dst->ac97_tag |= TAG_PCM_LEFT;

		}
#if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
		if (chan_mask & SP_SR) {
			dst->ac97_sl = *src++;
			dst->ac97_tag |= TAG_PCM_SL;
		}
		if (chan_mask & SP_SL) {
			dst->ac97_sr = *src++;
			dst->ac97_tag |= TAG_PCM_SR;
		}
		if (chan_mask & SP_LFE) {
			dst->ac97_lfe = *src++;
			dst->ac97_tag |= TAG_PCM_LFE;
		}
		if (chan_mask & SP_FC) {
			dst->ac97_center = *src++;
			dst->ac97_tag |= TAG_PCM_CENTER;
		}
#endif
		dst++;
	}
}
EXPORT_SYMBOL(bf5xx_pcm_to_ac97);

void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst,
		size_t count)
{
	while (count--) {
		*(dst++) = src->ac97_pcm_l;
		*(dst++) = src->ac97_pcm_r;
		src++;
	}
}
EXPORT_SYMBOL(bf5xx_ac97_to_pcm);

static unsigned int sport_tx_curr_frag(struct sport_device *sport)
{
	return sport->tx_curr_frag = sport_curr_offset_tx(sport) /
			sport->tx_fragsize;
}

static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data)
{
	struct sport_device *sport = ac97_sport_handle;
	int *cmd_count = sport->private_data;
	int nextfrag = sport_tx_curr_frag(sport);
	struct ac97_frame *nextwrite;

	sport_incfrag(sport, &nextfrag, 1);

	nextwrite = (struct ac97_frame *)(sport->tx_buf +
			nextfrag * sport->tx_fragsize);
	pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n",
		sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]);
	nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD;
	nextwrite[cmd_count[nextfrag]].ac97_addr = addr;
	nextwrite[cmd_count[nextfrag]].ac97_data = data;
	++cmd_count[nextfrag];
	pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n",
			addr >> 8, data, nextfrag);
}

static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97,
	unsigned short reg)
{
	struct sport_device *sport_handle = ac97_sport_handle;
	struct ac97_frame out_frame[2], in_frame[2];

	pr_debug("%s enter 0x%x\n", __func__, reg);

	/* When dma descriptor is enabled, the register should not be read */
	if (sport_handle->tx_run || sport_handle->rx_run) {
		pr_err("Could you send a mail to cliff.cai@analog.com "
				"to report this?\n");
		return -EFAULT;
	}

	memset(&out_frame, 0, 2 * sizeof(struct ac97_frame));
	memset(&in_frame, 0, 2 * sizeof(struct ac97_frame));
	out_frame[0].ac97_tag = TAG_VALID | TAG_CMD;
	out_frame[0].ac97_addr = ((reg << 8) | 0x8000);
	sport_send_and_recv(sport_handle, (unsigned char *)&out_frame,
			(unsigned char *)&in_frame,
			2 * sizeof(struct ac97_frame));
	return in_frame[1].ac97_data;
}

void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
	unsigned short val)
{
	struct sport_device *sport_handle = ac97_sport_handle;

	pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val);

	if (sport_handle->tx_run) {
		enqueue_cmd(ac97, (reg << 8), val); /* write */
		enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */
	} else {
		struct ac97_frame frame;
		memset(&frame, 0, sizeof(struct ac97_frame));
		frame.ac97_tag = TAG_VALID | TAG_CMD;
		frame.ac97_addr = (reg << 8);
		frame.ac97_data = val;
		sport_send_and_recv(sport_handle, (unsigned char *)&frame, \
				NULL, sizeof(struct ac97_frame));
	}
}

static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97)
{
	struct sport_device *sport_handle = ac97_sport_handle;
	u16 gpio = P_IDENT(sport_handle->pin_req[3]);

	pr_debug("%s enter\n", __func__);

	peripheral_free_list(sport_handle->pin_req);
	gpio_request(gpio, "bf5xx-ac97");
	gpio_direction_output(gpio, 1);
	udelay(2);
	gpio_set_value(gpio, 0);
	udelay(1);
	gpio_free(gpio);
	peripheral_request_list(sport_handle->pin_req, "soc-audio");
}

static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97)
{
#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
	pr_debug("%s enter\n", __func__);

	/* It is specified for bf548-ezkit */
	gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0);
	/* Keep reset pin low for 1 ms */
	mdelay(1);
	gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
	/* Wait for bit clock recover */
	mdelay(1);
#else
	pr_info("%s: Not implemented\n", __func__);
#endif
}

struct snd_ac97_bus_ops soc_ac97_ops = {
	.read	= bf5xx_ac97_read,
	.write	= bf5xx_ac97_write,
	.warm_reset	= bf5xx_ac97_warm_reset,
	.reset	= bf5xx_ac97_cold_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);

#ifdef CONFIG_PM
static int bf5xx_ac97_suspend(struct snd_soc_dai *dai)
{
	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);

	pr_debug("%s : sport %d\n", __func__, dai->id);
	if (!dai->active)
		return 0;
	if (dai->capture_active)
		sport_rx_stop(sport);
	if (dai->playback_active)
		sport_tx_stop(sport);
	return 0;
}

static int bf5xx_ac97_resume(struct snd_soc_dai *dai)
{
	int ret;
	struct sport_device *sport = snd_soc_dai_get_drvdata(dai);

	pr_debug("%s : sport %d\n", __func__, dai->id);
	if (!dai->active)
		return 0;

#if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
	ret = sport_set_multichannel(sport, 16, 0x3FF, 1);
#else
	ret = sport_set_multichannel(sport, 16, 0x1F, 1);
#endif
	if (ret) {
		pr_err("SPORT is busy!\n");
		return -EBUSY;
	}

	ret = sport_config_rx(sport, IRFS, 0xF, 0, (16*16-1));
	if (ret) {
		pr_err("SPORT is busy!\n");
		return -EBUSY;
	}

	ret = sport_config_tx(sport, ITFS, 0xF, 0, (16*16-1));
	if (ret) {
		pr_err("SPORT is busy!\n");
		return -EBUSY;
	}

	return 0;
}

#else
#define bf5xx_ac97_suspend	NULL
#define bf5xx_ac97_resume	NULL
#endif

static struct snd_soc_dai_driver bfin_ac97_dai = {
	.ac97_control = 1,
	.suspend = bf5xx_ac97_suspend,
	.resume = bf5xx_ac97_resume,
	.playback = {
		.stream_name = "AC97 Playback",
		.channels_min = 2,
#if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
		.channels_max = 6,
#else
		.channels_max = 2,
#endif
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE, },
	.capture = {
		.stream_name = "AC97 Capture",
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE, },
};

static int asoc_bfin_ac97_probe(struct platform_device *pdev)
{
	struct sport_device *sport_handle;
	int ret;

#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
	/* Request PB3 as reset pin */
	if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) {
		pr_err("Failed to request GPIO_%d for reset\n",
				CONFIG_SND_BF5XX_RESET_GPIO_NUM);
		ret =  -1;
		goto gpio_err;
	}
	gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1);
#endif

	sport_handle = sport_init(pdev, 2, sizeof(struct ac97_frame),
		PAGE_SIZE);
	if (!sport_handle) {
		ret = -ENODEV;
		goto sport_err;
	}

	/*SPORT works in TDM mode to simulate AC97 transfers*/
#if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT)
	ret = sport_set_multichannel(sport_handle, 16, 0x3FF, 1);
#else
	ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1);
#endif
	if (ret) {
		pr_err("SPORT is busy!\n");
		ret = -EBUSY;
		goto sport_config_err;
	}

	ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1));
	if (ret) {
		pr_err("SPORT is busy!\n");
		ret = -EBUSY;
		goto sport_config_err;
	}

	ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1));
	if (ret) {
		pr_err("SPORT is busy!\n");
		ret = -EBUSY;
		goto sport_config_err;
	}

	ret = snd_soc_register_dai(&pdev->dev, &bfin_ac97_dai);
	if (ret) {
		pr_err("Failed to register DAI: %d\n", ret);
		goto sport_config_err;
	}

	ac97_sport_handle = sport_handle;

	return 0;

sport_config_err:
	sport_done(sport_handle);
sport_err:
#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
	gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
gpio_err:
#endif

	return ret;
}

static int asoc_bfin_ac97_remove(struct platform_device *pdev)
{
	struct sport_device *sport_handle = platform_get_drvdata(pdev);

	snd_soc_unregister_dai(&pdev->dev);
	sport_done(sport_handle);
#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
	gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
#endif

	return 0;
}

static struct platform_driver asoc_bfin_ac97_driver = {
	.driver = {
			.name = "bfin-ac97",
			.owner = THIS_MODULE,
	},

	.probe = asoc_bfin_ac97_probe,
	.remove = asoc_bfin_ac97_remove,
};

module_platform_driver(asoc_bfin_ac97_driver);

MODULE_AUTHOR("Roy Huang");
MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
MODULE_LICENSE("GPL");