summaryrefslogtreecommitdiffstats
path: root/sound/soc/fsl/mpc5200_psc_ac97.c
blob: 40acc8e2b1cac1a36ba8a94d11dccd9d10129e55 (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
/*
 * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip.
 *
 * Copyright (C) 2009 Jon Smirl, Digispeaker
 * Author: Jon Smirl <jonsmirl@gmail.com>
 *
 * 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/module.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/delay.h>

#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>

#include <asm/time.h>
#include <asm/delay.h>
#include <asm/mpc52xx.h>
#include <asm/mpc52xx_psc.h>

#include "mpc5200_dma.h"
#include "mpc5200_psc_ac97.h"

#define DRV_NAME "mpc5200-psc-ac97"

/* ALSA only supports a single AC97 device so static is recommend here */
static struct psc_dma *psc_dma;

static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
	int status;
	unsigned int val;

	mutex_lock(&psc_dma->mutex);

	/* Wait for command send status zero = ready */
	status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
				MPC52xx_PSC_SR_CMDSEND), 100, 0);
	if (status == 0) {
		pr_err("timeout on ac97 bus (rdy)\n");
		mutex_unlock(&psc_dma->mutex);
		return -ENODEV;
	}

	/* Force clear the data valid bit */
	in_be32(&psc_dma->psc_regs->ac97_data);

	/* Send the read */
	out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24));

	/* Wait for the answer */
	status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) &
				MPC52xx_PSC_SR_DATA_VAL), 100, 0);
	if (status == 0) {
		pr_err("timeout on ac97 read (val) %x\n",
				in_be16(&psc_dma->psc_regs->sr_csr.status));
		mutex_unlock(&psc_dma->mutex);
		return -ENODEV;
	}
	/* Get the data */
	val = in_be32(&psc_dma->psc_regs->ac97_data);
	if (((val >> 24) & 0x7f) != reg) {
		pr_err("reg echo error on ac97 read\n");
		mutex_unlock(&psc_dma->mutex);
		return -ENODEV;
	}
	val = (val >> 8) & 0xffff;

	mutex_unlock(&psc_dma->mutex);
	return (unsigned short) val;
}

static void psc_ac97_write(struct snd_ac97 *ac97,
				unsigned short reg, unsigned short val)
{
	int status;

	mutex_lock(&psc_dma->mutex);

	/* Wait for command status zero = ready */
	status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) &
				MPC52xx_PSC_SR_CMDSEND), 100, 0);
	if (status == 0) {
		pr_err("timeout on ac97 bus (write)\n");
		goto out;
	}
	/* Write data */
	out_be32(&psc_dma->psc_regs->ac97_cmd,
			((reg & 0x7f) << 24) | (val << 8));

 out:
	mutex_unlock(&psc_dma->mutex);
}

static void psc_ac97_warm_reset(struct snd_ac97 *ac97)
{
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

	mutex_lock(&psc_dma->mutex);

	out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR);
	udelay(3);
	out_be32(&regs->sicr, psc_dma->sicr);

	mutex_unlock(&psc_dma->mutex);
}

static void psc_ac97_cold_reset(struct snd_ac97 *ac97)
{
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

	mutex_lock(&psc_dma->mutex);
	dev_dbg(psc_dma->dev, "cold reset\n");

	mpc5200_psc_ac97_gpio_reset(psc_dma->id);

	/* Notify the PSC that a reset has occurred */
	out_be32(&regs->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB);

	/* Re-enable RX and TX */
	out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);

	mutex_unlock(&psc_dma->mutex);

	msleep(1);
	psc_ac97_warm_reset(ac97);
}

struct snd_ac97_bus_ops soc_ac97_ops = {
	.read		= psc_ac97_read,
	.write		= psc_ac97_write,
	.reset		= psc_ac97_cold_reset,
	.warm_reset	= psc_ac97_warm_reset,
};
EXPORT_SYMBOL_GPL(soc_ac97_ops);

static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *cpu_dai)
{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);

	dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
		" periods=%i buffer_size=%i  buffer_bytes=%i channels=%i"
		" rate=%i format=%i\n",
		__func__, substream, params_period_size(params),
		params_period_bytes(params), params_periods(params),
		params_buffer_size(params), params_buffer_bytes(params),
		params_channels(params), params_rate(params),
		params_format(params));

	/* Determine the set of enable bits to turn on */
	s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300;
	if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE)
		s->ac97_slot_bits <<= 16;
	return 0;
}

static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *cpu_dai)
{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);

	dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream);

	if (params_channels(params) == 1)
		out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000);
	else
		out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000);

	return 0;
}

static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd,
							struct snd_soc_dai *dai)
{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai);
	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n",
			substream->pstr->stream);

		/* Set the slot enable bits */
		psc_dma->slots |= s->ac97_slot_bits;
		out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
		break;

	case SNDRV_PCM_TRIGGER_STOP:
		dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n",
			substream->pstr->stream);

		/* Clear the slot enable bits */
		psc_dma->slots &= ~(s->ac97_slot_bits);
		out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots);
		break;
	}
	return 0;
}

static int psc_ac97_probe(struct snd_soc_dai *cpu_dai)
{
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai);
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;

	/* Go */
	out_8(&regs->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
	return 0;
}

/* ---------------------------------------------------------------------
 * ALSA SoC Bindings
 *
 * - Digital Audio Interface (DAI) template
 * - create/destroy dai hooks
 */

/**
 * psc_ac97_dai_template: template CPU Digital Audio Interface
 */
static struct snd_soc_dai_ops psc_ac97_analog_ops = {
	.hw_params	= psc_ac97_hw_analog_params,
	.trigger	= psc_ac97_trigger,
};

static struct snd_soc_dai_ops psc_ac97_digital_ops = {
	.hw_params	= psc_ac97_hw_digital_params,
};

static struct snd_soc_dai_driver psc_ac97_dai[] = {
{
	.ac97_control = 1,
	.probe	= psc_ac97_probe,
	.playback = {
		.channels_min   = 1,
		.channels_max   = 6,
		.rates          = SNDRV_PCM_RATE_8000_48000,
		.formats = SNDRV_PCM_FMTBIT_S32_BE,
	},
	.capture = {
		.channels_min   = 1,
		.channels_max   = 2,
		.rates          = SNDRV_PCM_RATE_8000_48000,
		.formats = SNDRV_PCM_FMTBIT_S32_BE,
	},
	.ops = &psc_ac97_analog_ops,
},
{
	.ac97_control = 1,
	.playback = {
		.channels_min   = 1,
		.channels_max   = 2,
		.rates          = SNDRV_PCM_RATE_32000 | \
			SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000,
		.formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE,
	},
	.ops = &psc_ac97_digital_ops,
} };



/* ---------------------------------------------------------------------
 * OF platform bus binding code:
 * - Probe/remove operations
 * - OF device match table
 */
static int __devinit psc_ac97_of_probe(struct platform_device *op,
				      const struct of_device_id *match)
{
	int rc;
	struct snd_ac97 ac97;
	struct mpc52xx_psc __iomem *regs;

	rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai));
	if (rc != 0) {
		dev_err(&op->dev, "Failed to register DAI\n");
		return rc;
	}

	psc_dma = dev_get_drvdata(&op->dev);
	regs = psc_dma->psc_regs;
	ac97.private_data = psc_dma;

	psc_dma->imr = 0;
	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);

	/* Configure the serial interface mode to AC97 */
	psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97;
	out_be32(&regs->sicr, psc_dma->sicr);

	/* No slots active */
	out_be32(&regs->ac97_slots, 0x00000000);

	return 0;
}

static int __devexit psc_ac97_of_remove(struct platform_device *op)
{
	snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai));
	return 0;
}

/* Match table for of_platform binding */
static struct of_device_id psc_ac97_match[] __devinitdata = {
	{ .compatible = "fsl,mpc5200-psc-ac97", },
	{ .compatible = "fsl,mpc5200b-psc-ac97", },
	{}
};
MODULE_DEVICE_TABLE(of, psc_ac97_match);

static struct of_platform_driver psc_ac97_driver = {
	.probe = psc_ac97_of_probe,
	.remove = __devexit_p(psc_ac97_of_remove),
	.driver = {
		.name = "mpc5200-psc-ac97",
		.owner = THIS_MODULE,
		.of_match_table = psc_ac97_match,
	},
};

/* ---------------------------------------------------------------------
 * Module setup and teardown; simply register the of_platform driver
 * for the PSC in AC97 mode.
 */
static int __init psc_ac97_init(void)
{
	return of_register_platform_driver(&psc_ac97_driver);
}
module_init(psc_ac97_init);

static void __exit psc_ac97_exit(void)
{
	of_unregister_platform_driver(&psc_ac97_driver);
}
module_exit(psc_ac97_exit);

MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>");
MODULE_DESCRIPTION("mpc5200 AC97 module");
MODULE_LICENSE("GPL");

OpenPOWER on IntegriCloud