summaryrefslogtreecommitdiff
path: root/sound/soc/fsl/mpc5200_psc_i2s.c
blob: 8974b53eec9fb58db7b64ec4e13550f706308c27 (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
/*
 * Freescale MPC5200 PSC in I2S mode
 * ALSA SoC Digital Audio Interface (DAI) driver
 *
 * Copyright (C) 2008 Secret Lab Technologies Ltd.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/soc-of-simple.h>

#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/gen_bd.h>
#include <asm/mpc52xx_psc.h>

#include "mpc5200_dma.h"

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver");
MODULE_LICENSE("GPL");

/**
 * PSC_I2S_RATES: sample rates supported by the I2S
 *
 * This driver currently only supports the PSC running in I2S slave mode,
 * which means the codec determines the sample rate.  Therefore, we tell
 * ALSA that we support all rates and let the codec driver decide what rates
 * are really supported.
 */
#define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \
			SNDRV_PCM_RATE_CONTINUOUS)

/**
 * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode
 */
#define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \
			 SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \
			 SNDRV_PCM_FMTBIT_S32_BE)

static int psc_i2s_hw_params(struct snd_pcm_substream *substream,
				 struct snd_pcm_hw_params *params,
				 struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data;
	u32 mode;

	dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i"
		" periods=%i buffer_size=%i  buffer_bytes=%i\n",
		__func__, substream, params_period_size(params),
		params_period_bytes(params), params_periods(params),
		params_buffer_size(params), params_buffer_bytes(params));

	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S8:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_8;
		break;
	case SNDRV_PCM_FORMAT_S16_BE:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_16;
		break;
	case SNDRV_PCM_FORMAT_S24_BE:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_24;
		break;
	case SNDRV_PCM_FORMAT_S32_BE:
		mode = MPC52xx_PSC_SICR_SIM_CODEC_32;
		break;
	default:
		dev_dbg(psc_i2s->dev, "invalid format\n");
		return -EINVAL;
	}
	out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | mode);

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	return 0;
}

/**
 * psc_i2s_set_sysclk: set the clock frequency and direction
 *
 * This function is called by the machine driver to tell us what the clock
 * frequency and direction are.
 *
 * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN),
 * and we don't care about the frequency.  Return an error if the direction
 * is not SND_SOC_CLOCK_IN.
 *
 * @clk_id: reserved, should be zero
 * @freq: the frequency of the given clock ID, currently ignored
 * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master)
 */
static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
			      int clk_id, unsigned int freq, int dir)
{
	struct psc_i2s *psc_i2s = cpu_dai->private_data;
	dev_dbg(psc_i2s->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n",
				cpu_dai, dir);
	return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL;
}

/**
 * psc_i2s_set_fmt: set the serial format.
 *
 * This function is called by the machine driver to tell us what serial
 * format to use.
 *
 * This driver only supports I2S mode.  Return an error if the format is
 * not SND_SOC_DAIFMT_I2S.
 *
 * @format: one of SND_SOC_DAIFMT_xxx
 */
static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format)
{
	struct psc_i2s *psc_i2s = cpu_dai->private_data;
	dev_dbg(psc_i2s->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n",
				cpu_dai, format);
	return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL;
}

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

/**
 * psc_i2s_dai_template: template CPU Digital Audio Interface
 */
static struct snd_soc_dai_ops psc_i2s_dai_ops = {
	.startup	= psc_i2s_startup,
	.hw_params	= psc_i2s_hw_params,
	.hw_free	= psc_i2s_hw_free,
	.shutdown	= psc_i2s_shutdown,
	.trigger	= psc_i2s_trigger,
	.set_sysclk	= psc_i2s_set_sysclk,
	.set_fmt	= psc_i2s_set_fmt,
};

static struct snd_soc_dai psc_i2s_dai_template = {
	.playback = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = PSC_I2S_RATES,
		.formats = PSC_I2S_FORMATS,
	},
	.capture = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = PSC_I2S_RATES,
		.formats = PSC_I2S_FORMATS,
	},
	.ops = &psc_i2s_dai_ops,
};

/* ---------------------------------------------------------------------
 * Sysfs attributes for debugging
 */

static ssize_t psc_i2s_status_show(struct device *dev,
			   struct device_attribute *attr, char *buf)
{
	struct psc_i2s *psc_i2s = dev_get_drvdata(dev);

	return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x "
			"tfnum=%i tfstat=0x%.4x\n",
			in_be16(&psc_i2s->psc_regs->sr_csr.status),
			in_be32(&psc_i2s->psc_regs->sicr),
			in_be16(&psc_i2s->fifo_regs->rfnum) & 0x1ff,
			in_be16(&psc_i2s->fifo_regs->rfstat),
			in_be16(&psc_i2s->fifo_regs->tfnum) & 0x1ff,
			in_be16(&psc_i2s->fifo_regs->tfstat));
}

static int *psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s, const char *name)
{
	if (strcmp(name, "playback_underrun") == 0)
		return &psc_i2s->stats.underrun_count;
	if (strcmp(name, "capture_overrun") == 0)
		return &psc_i2s->stats.overrun_count;

	return NULL;
}

static ssize_t psc_i2s_stat_show(struct device *dev,
				 struct device_attribute *attr, char *buf)
{
	struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
	int *attrib;

	attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
	if (!attrib)
		return 0;

	return sprintf(buf, "%i\n", *attrib);
}

static ssize_t psc_i2s_stat_store(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf,
				  size_t count)
{
	struct psc_i2s *psc_i2s = dev_get_drvdata(dev);
	int *attrib;

	attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name);
	if (!attrib)
		return 0;

	*attrib = simple_strtoul(buf, NULL, 0);
	return count;
}

static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL);
static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show,
			psc_i2s_stat_store);
static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show,
			psc_i2s_stat_store);

/* ---------------------------------------------------------------------
 * OF platform bus binding code:
 * - Probe/remove operations
 * - OF device match table
 */
static int __devinit psc_i2s_of_probe(struct of_device *op,
				      const struct of_device_id *match)
{
	phys_addr_t fifo;
	struct psc_i2s *psc_i2s;
	struct resource res;
	int size, psc_id, irq, rc;
	const __be32 *prop;
	void __iomem *regs;

	dev_dbg(&op->dev, "probing psc i2s device\n");

	/* Get the PSC ID */
	prop = of_get_property(op->node, "cell-index", &size);
	if (!prop || size < sizeof *prop)
		return -ENODEV;
	psc_id = be32_to_cpu(*prop);

	/* Fetch the registers and IRQ of the PSC */
	irq = irq_of_parse_and_map(op->node, 0);
	if (of_address_to_resource(op->node, 0, &res)) {
		dev_err(&op->dev, "Missing reg property\n");
		return -ENODEV;
	}
	regs = ioremap(res.start, 1 + res.end - res.start);
	if (!regs) {
		dev_err(&op->dev, "Could not map registers\n");
		return -ENODEV;
	}

	/* Allocate and initialize the driver private data */
	psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL);
	if (!psc_i2s) {
		iounmap(regs);
		return -ENOMEM;
	}
	spin_lock_init(&psc_i2s->lock);
	psc_i2s->irq = irq;
	psc_i2s->psc_regs = regs;
	psc_i2s->fifo_regs = regs + sizeof *psc_i2s->psc_regs;
	psc_i2s->dev = &op->dev;
	psc_i2s->playback.psc_i2s = psc_i2s;
	psc_i2s->capture.psc_i2s = psc_i2s;
	snprintf(psc_i2s->name, sizeof psc_i2s->name, "PSC%u", psc_id+1);

	/* Fill out the CPU DAI structure */
	memcpy(&psc_i2s->dai, &psc_i2s_dai_template, sizeof psc_i2s->dai);
	psc_i2s->dai.private_data = psc_i2s;
	psc_i2s->dai.name = psc_i2s->name;
	psc_i2s->dai.id = psc_id;

	/* Find the address of the fifo data registers and setup the
	 * DMA tasks */
	fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
	psc_i2s->capture.bcom_task =
		bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512);
	psc_i2s->playback.bcom_task =
		bcom_psc_gen_bd_tx_init(psc_id, 10, fifo);
	if (!psc_i2s->capture.bcom_task ||
	    !psc_i2s->playback.bcom_task) {
		dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
		iounmap(regs);
		kfree(psc_i2s);
		return -ENODEV;
	}

	/* Disable all interrupts and reset the PSC */
	out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0);
	out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset transmitter */
	out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset receiver */
	out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */
	out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */

	/* Configure the serial interface mode; defaulting to CODEC8 mode */
	psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S |
			MPC52xx_PSC_SICR_CLKPOL;
	if (of_get_property(op->node, "fsl,cellslave", NULL))
		psc_i2s->sicr |= MPC52xx_PSC_SICR_CELLSLAVE |
				 MPC52xx_PSC_SICR_GENCLK;
	out_be32(&psc_i2s->psc_regs->sicr,
		 psc_i2s->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8);

	/* Check for the codec handle.  If it is not present then we
	 * are done */
	if (!of_get_property(op->node, "codec-handle", NULL))
		return 0;

	/* Set up mode register;
	 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
	 * Second write: register Normal mode for non loopback
	 */
	out_8(&psc_i2s->psc_regs->mode, 0);
	out_8(&psc_i2s->psc_regs->mode, 0);

	/* Set the TX and RX fifo alarm thresholds */
	out_be16(&psc_i2s->fifo_regs->rfalarm, 0x100);
	out_8(&psc_i2s->fifo_regs->rfcntl, 0x4);
	out_be16(&psc_i2s->fifo_regs->tfalarm, 0x100);
	out_8(&psc_i2s->fifo_regs->tfcntl, 0x7);

	/* Lookup the IRQ numbers */
	psc_i2s->playback.irq =
		bcom_get_task_irq(psc_i2s->playback.bcom_task);
	psc_i2s->capture.irq =
		bcom_get_task_irq(psc_i2s->capture.bcom_task);

	/* Save what we've done so it can be found again later */
	dev_set_drvdata(&op->dev, psc_i2s);

	/* Register the SYSFS files */
	rc = device_create_file(psc_i2s->dev, &dev_attr_status);
	rc |= device_create_file(psc_i2s->dev, &dev_attr_capture_overrun);
	rc |= device_create_file(psc_i2s->dev, &dev_attr_playback_underrun);
	if (rc)
		dev_info(psc_i2s->dev, "error creating sysfs files\n");

	snd_soc_register_platform(&psc_i2s_pcm_soc_platform);

	/* Tell the ASoC OF helpers about it */
	of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform, op->node,
				     &psc_i2s->dai);

	return 0;
}

static int __devexit psc_i2s_of_remove(struct of_device *op)
{
	struct psc_i2s *psc_i2s = dev_get_drvdata(&op->dev);

	dev_dbg(&op->dev, "psc_i2s_remove()\n");

	snd_soc_unregister_platform(&psc_i2s_pcm_soc_platform);

	bcom_gen_bd_rx_release(psc_i2s->capture.bcom_task);
	bcom_gen_bd_tx_release(psc_i2s->playback.bcom_task);

	iounmap(psc_i2s->psc_regs);
	iounmap(psc_i2s->fifo_regs);
	kfree(psc_i2s);
	dev_set_drvdata(&op->dev, NULL);

	return 0;
}

/* Match table for of_platform binding */
static struct of_device_id psc_i2s_match[] __devinitdata = {
	{ .compatible = "fsl,mpc5200-psc-i2s", },
	{}
};
MODULE_DEVICE_TABLE(of, psc_i2s_match);

static struct of_platform_driver psc_i2s_driver = {
	.match_table = psc_i2s_match,
	.probe = psc_i2s_of_probe,
	.remove = __devexit_p(psc_i2s_of_remove),
	.driver = {
		.name = "mpc5200-psc-i2s",
		.owner = THIS_MODULE,
	},
};

/* ---------------------------------------------------------------------
 * Module setup and teardown; simply register the of_platform driver
 * for the PSC in I2S mode.
 */
static int __init psc_i2s_init(void)
{
	return of_register_platform_driver(&psc_i2s_driver);
}
module_init(psc_i2s_init);

static void __exit psc_i2s_exit(void)
{
	of_unregister_platform_driver(&psc_i2s_driver);
}
module_exit(psc_i2s_exit);