xref: /openbmc/linux/sound/soc/ti/omap-mcpdm.c (revision dd9d64de)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * omap-mcpdm.c  --  OMAP ALSA SoC DAI driver using McPDM port
4  *
5  * Copyright (C) 2009 - 2011 Texas Instruments
6  *
7  * Author: Misael Lopez Cruz <misael.lopez@ti.com>
8  * Contact: Jorge Eduardo Candelaria <x0107209@ti.com>
9  *          Margarita Olaya <magi.olaya@ti.com>
10  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
11  */
12 
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/interrupt.h>
17 #include <linux/err.h>
18 #include <linux/io.h>
19 #include <linux/irq.h>
20 #include <linux/slab.h>
21 #include <linux/pm_runtime.h>
22 #include <linux/of_device.h>
23 
24 #include <sound/core.h>
25 #include <sound/pcm.h>
26 #include <sound/pcm_params.h>
27 #include <sound/soc.h>
28 #include <sound/dmaengine_pcm.h>
29 
30 #include "omap-mcpdm.h"
31 #include "sdma-pcm.h"
32 
33 struct mcpdm_link_config {
34 	u32 link_mask; /* channel mask for the direction */
35 	u32 threshold; /* FIFO threshold */
36 };
37 
38 struct omap_mcpdm {
39 	struct device *dev;
40 	unsigned long phys_base;
41 	void __iomem *io_base;
42 	int irq;
43 	struct pm_qos_request pm_qos_req;
44 	int latency[2];
45 
46 	struct mutex mutex;
47 
48 	/* Playback/Capture configuration */
49 	struct mcpdm_link_config config[2];
50 
51 	/* McPDM dn offsets for rx1, and 2 channels */
52 	u32 dn_rx_offset;
53 
54 	/* McPDM needs to be restarted due to runtime reconfiguration */
55 	bool restart;
56 
57 	/* pm state for suspend/resume handling */
58 	int pm_active_count;
59 
60 	struct snd_dmaengine_dai_dma_data dma_data[2];
61 };
62 
63 /*
64  * Stream DMA parameters
65  */
66 
omap_mcpdm_write(struct omap_mcpdm * mcpdm,u16 reg,u32 val)67 static inline void omap_mcpdm_write(struct omap_mcpdm *mcpdm, u16 reg, u32 val)
68 {
69 	writel_relaxed(val, mcpdm->io_base + reg);
70 }
71 
omap_mcpdm_read(struct omap_mcpdm * mcpdm,u16 reg)72 static inline int omap_mcpdm_read(struct omap_mcpdm *mcpdm, u16 reg)
73 {
74 	return readl_relaxed(mcpdm->io_base + reg);
75 }
76 
77 #ifdef DEBUG
omap_mcpdm_reg_dump(struct omap_mcpdm * mcpdm)78 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm)
79 {
80 	dev_dbg(mcpdm->dev, "***********************\n");
81 	dev_dbg(mcpdm->dev, "IRQSTATUS_RAW:  0x%04x\n",
82 			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS_RAW));
83 	dev_dbg(mcpdm->dev, "IRQSTATUS:  0x%04x\n",
84 			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS));
85 	dev_dbg(mcpdm->dev, "IRQENABLE_SET:  0x%04x\n",
86 			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_SET));
87 	dev_dbg(mcpdm->dev, "IRQENABLE_CLR:  0x%04x\n",
88 			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQENABLE_CLR));
89 	dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
90 			omap_mcpdm_read(mcpdm, MCPDM_REG_IRQWAKE_EN));
91 	dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
92 			omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_SET));
93 	dev_dbg(mcpdm->dev, "DMAENABLE_CLR:  0x%04x\n",
94 			omap_mcpdm_read(mcpdm, MCPDM_REG_DMAENABLE_CLR));
95 	dev_dbg(mcpdm->dev, "DMAWAKEEN:  0x%04x\n",
96 			omap_mcpdm_read(mcpdm, MCPDM_REG_DMAWAKEEN));
97 	dev_dbg(mcpdm->dev, "CTRL:  0x%04x\n",
98 			omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL));
99 	dev_dbg(mcpdm->dev, "DN_DATA:  0x%04x\n",
100 			omap_mcpdm_read(mcpdm, MCPDM_REG_DN_DATA));
101 	dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
102 			omap_mcpdm_read(mcpdm, MCPDM_REG_UP_DATA));
103 	dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
104 			omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_DN));
105 	dev_dbg(mcpdm->dev, "FIFO_CTRL_UP:  0x%04x\n",
106 			omap_mcpdm_read(mcpdm, MCPDM_REG_FIFO_CTRL_UP));
107 	dev_dbg(mcpdm->dev, "***********************\n");
108 }
109 #else
omap_mcpdm_reg_dump(struct omap_mcpdm * mcpdm)110 static void omap_mcpdm_reg_dump(struct omap_mcpdm *mcpdm) {}
111 #endif
112 
113 /*
114  * Enables the transfer through the PDM interface to/from the Phoenix
115  * codec by enabling the corresponding UP or DN channels.
116  */
omap_mcpdm_start(struct omap_mcpdm * mcpdm)117 static void omap_mcpdm_start(struct omap_mcpdm *mcpdm)
118 {
119 	u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
120 	u32 link_mask = mcpdm->config[0].link_mask | mcpdm->config[1].link_mask;
121 
122 	ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
123 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
124 
125 	ctrl |= link_mask;
126 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
127 
128 	ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
129 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
130 }
131 
132 /*
133  * Disables the transfer through the PDM interface to/from the Phoenix
134  * codec by disabling the corresponding UP or DN channels.
135  */
omap_mcpdm_stop(struct omap_mcpdm * mcpdm)136 static void omap_mcpdm_stop(struct omap_mcpdm *mcpdm)
137 {
138 	u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
139 	u32 link_mask = MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK;
140 
141 	ctrl |= (MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
142 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
143 
144 	ctrl &= ~(link_mask);
145 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
146 
147 	ctrl &= ~(MCPDM_SW_DN_RST | MCPDM_SW_UP_RST);
148 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl);
149 
150 }
151 
152 /*
153  * Is the physical McPDM interface active.
154  */
omap_mcpdm_active(struct omap_mcpdm * mcpdm)155 static inline int omap_mcpdm_active(struct omap_mcpdm *mcpdm)
156 {
157 	return omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL) &
158 					(MCPDM_PDM_DN_MASK | MCPDM_PDM_UP_MASK);
159 }
160 
161 /*
162  * Configures McPDM uplink, and downlink for audio.
163  * This function should be called before omap_mcpdm_start.
164  */
omap_mcpdm_open_streams(struct omap_mcpdm * mcpdm)165 static void omap_mcpdm_open_streams(struct omap_mcpdm *mcpdm)
166 {
167 	u32 ctrl = omap_mcpdm_read(mcpdm, MCPDM_REG_CTRL);
168 
169 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, ctrl | MCPDM_WD_EN);
170 
171 	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_SET,
172 			MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL |
173 			MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
174 
175 	/* Enable DN RX1/2 offset cancellation feature, if configured */
176 	if (mcpdm->dn_rx_offset) {
177 		u32 dn_offset = mcpdm->dn_rx_offset;
178 
179 		omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
180 		dn_offset |= (MCPDM_DN_OFST_RX1_EN | MCPDM_DN_OFST_RX2_EN);
181 		omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, dn_offset);
182 	}
183 
184 	omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_DN,
185 			 mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold);
186 	omap_mcpdm_write(mcpdm, MCPDM_REG_FIFO_CTRL_UP,
187 			 mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold);
188 
189 	omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_SET,
190 			MCPDM_DMA_DN_ENABLE | MCPDM_DMA_UP_ENABLE);
191 }
192 
193 /*
194  * Cleans McPDM uplink, and downlink configuration.
195  * This function should be called when the stream is closed.
196  */
omap_mcpdm_close_streams(struct omap_mcpdm * mcpdm)197 static void omap_mcpdm_close_streams(struct omap_mcpdm *mcpdm)
198 {
199 	/* Disable irq request generation for downlink */
200 	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
201 			MCPDM_DN_IRQ_EMPTY | MCPDM_DN_IRQ_FULL);
202 
203 	/* Disable DMA request generation for downlink */
204 	omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_DN_ENABLE);
205 
206 	/* Disable irq request generation for uplink */
207 	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQENABLE_CLR,
208 			MCPDM_UP_IRQ_EMPTY | MCPDM_UP_IRQ_FULL);
209 
210 	/* Disable DMA request generation for uplink */
211 	omap_mcpdm_write(mcpdm, MCPDM_REG_DMAENABLE_CLR, MCPDM_DMA_UP_ENABLE);
212 
213 	/* Disable RX1/2 offset cancellation */
214 	if (mcpdm->dn_rx_offset)
215 		omap_mcpdm_write(mcpdm, MCPDM_REG_DN_OFFSET, 0);
216 }
217 
omap_mcpdm_irq_handler(int irq,void * dev_id)218 static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
219 {
220 	struct omap_mcpdm *mcpdm = dev_id;
221 	int irq_status;
222 
223 	irq_status = omap_mcpdm_read(mcpdm, MCPDM_REG_IRQSTATUS);
224 
225 	/* Acknowledge irq event */
226 	omap_mcpdm_write(mcpdm, MCPDM_REG_IRQSTATUS, irq_status);
227 
228 	if (irq_status & MCPDM_DN_IRQ_FULL)
229 		dev_dbg(mcpdm->dev, "DN (playback) FIFO Full\n");
230 
231 	if (irq_status & MCPDM_DN_IRQ_EMPTY)
232 		dev_dbg(mcpdm->dev, "DN (playback) FIFO Empty\n");
233 
234 	if (irq_status & MCPDM_DN_IRQ)
235 		dev_dbg(mcpdm->dev, "DN (playback) write request\n");
236 
237 	if (irq_status & MCPDM_UP_IRQ_FULL)
238 		dev_dbg(mcpdm->dev, "UP (capture) FIFO Full\n");
239 
240 	if (irq_status & MCPDM_UP_IRQ_EMPTY)
241 		dev_dbg(mcpdm->dev, "UP (capture) FIFO Empty\n");
242 
243 	if (irq_status & MCPDM_UP_IRQ)
244 		dev_dbg(mcpdm->dev, "UP (capture) write request\n");
245 
246 	return IRQ_HANDLED;
247 }
248 
omap_mcpdm_dai_startup(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)249 static int omap_mcpdm_dai_startup(struct snd_pcm_substream *substream,
250 				  struct snd_soc_dai *dai)
251 {
252 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
253 
254 	mutex_lock(&mcpdm->mutex);
255 
256 	if (!snd_soc_dai_active(dai))
257 		omap_mcpdm_open_streams(mcpdm);
258 
259 	mutex_unlock(&mcpdm->mutex);
260 
261 	return 0;
262 }
263 
omap_mcpdm_dai_shutdown(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)264 static void omap_mcpdm_dai_shutdown(struct snd_pcm_substream *substream,
265 				  struct snd_soc_dai *dai)
266 {
267 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
268 	int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
269 	int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
270 	int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
271 
272 	mutex_lock(&mcpdm->mutex);
273 
274 	if (!snd_soc_dai_active(dai)) {
275 		if (omap_mcpdm_active(mcpdm)) {
276 			omap_mcpdm_stop(mcpdm);
277 			omap_mcpdm_close_streams(mcpdm);
278 			mcpdm->config[0].link_mask = 0;
279 			mcpdm->config[1].link_mask = 0;
280 		}
281 	}
282 
283 	if (mcpdm->latency[stream2])
284 		cpu_latency_qos_update_request(&mcpdm->pm_qos_req,
285 					       mcpdm->latency[stream2]);
286 	else if (mcpdm->latency[stream1])
287 		cpu_latency_qos_remove_request(&mcpdm->pm_qos_req);
288 
289 	mcpdm->latency[stream1] = 0;
290 
291 	mutex_unlock(&mcpdm->mutex);
292 }
293 
omap_mcpdm_dai_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)294 static int omap_mcpdm_dai_hw_params(struct snd_pcm_substream *substream,
295 				    struct snd_pcm_hw_params *params,
296 				    struct snd_soc_dai *dai)
297 {
298 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
299 	int stream = substream->stream;
300 	struct snd_dmaengine_dai_dma_data *dma_data;
301 	u32 threshold;
302 	int channels, latency;
303 	int link_mask = 0;
304 
305 	channels = params_channels(params);
306 	switch (channels) {
307 	case 5:
308 		if (stream == SNDRV_PCM_STREAM_CAPTURE)
309 			/* up to 3 channels for capture */
310 			return -EINVAL;
311 		link_mask |= 1 << 4;
312 		fallthrough;
313 	case 4:
314 		if (stream == SNDRV_PCM_STREAM_CAPTURE)
315 			/* up to 3 channels for capture */
316 			return -EINVAL;
317 		link_mask |= 1 << 3;
318 		fallthrough;
319 	case 3:
320 		link_mask |= 1 << 2;
321 		fallthrough;
322 	case 2:
323 		link_mask |= 1 << 1;
324 		fallthrough;
325 	case 1:
326 		link_mask |= 1 << 0;
327 		break;
328 	default:
329 		/* unsupported number of channels */
330 		return -EINVAL;
331 	}
332 
333 	dma_data = snd_soc_dai_get_dma_data(dai, substream);
334 
335 	threshold = mcpdm->config[stream].threshold;
336 	/* Configure McPDM channels, and DMA packet size */
337 	if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
338 		link_mask <<= 3;
339 
340 		/* If capture is not running assume a stereo stream to come */
341 		if (!mcpdm->config[!stream].link_mask)
342 			mcpdm->config[!stream].link_mask = 0x3;
343 
344 		dma_data->maxburst =
345 				(MCPDM_DN_THRES_MAX - threshold) * channels;
346 		latency = threshold;
347 	} else {
348 		/* If playback is not running assume a stereo stream to come */
349 		if (!mcpdm->config[!stream].link_mask)
350 			mcpdm->config[!stream].link_mask = (0x3 << 3);
351 
352 		dma_data->maxburst = threshold * channels;
353 		latency = (MCPDM_DN_THRES_MAX - threshold);
354 	}
355 
356 	/*
357 	 * The DMA must act to a DMA request within latency time (usec) to avoid
358 	 * under/overflow
359 	 */
360 	mcpdm->latency[stream] = latency * USEC_PER_SEC / params_rate(params);
361 
362 	if (!mcpdm->latency[stream])
363 		mcpdm->latency[stream] = 10;
364 
365 	/* Check if we need to restart McPDM with this stream */
366 	if (mcpdm->config[stream].link_mask &&
367 	    mcpdm->config[stream].link_mask != link_mask)
368 		mcpdm->restart = true;
369 
370 	mcpdm->config[stream].link_mask = link_mask;
371 
372 	return 0;
373 }
374 
omap_mcpdm_prepare(struct snd_pcm_substream * substream,struct snd_soc_dai * dai)375 static int omap_mcpdm_prepare(struct snd_pcm_substream *substream,
376 				  struct snd_soc_dai *dai)
377 {
378 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
379 	struct pm_qos_request *pm_qos_req = &mcpdm->pm_qos_req;
380 	int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
381 	int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
382 	int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
383 	int latency = mcpdm->latency[stream2];
384 
385 	/* Prevent omap hardware from hitting off between FIFO fills */
386 	if (!latency || mcpdm->latency[stream1] < latency)
387 		latency = mcpdm->latency[stream1];
388 
389 	if (cpu_latency_qos_request_active(pm_qos_req))
390 		cpu_latency_qos_update_request(pm_qos_req, latency);
391 	else if (latency)
392 		cpu_latency_qos_add_request(pm_qos_req, latency);
393 
394 	if (!omap_mcpdm_active(mcpdm)) {
395 		omap_mcpdm_start(mcpdm);
396 		omap_mcpdm_reg_dump(mcpdm);
397 	} else if (mcpdm->restart) {
398 		omap_mcpdm_stop(mcpdm);
399 		omap_mcpdm_start(mcpdm);
400 		mcpdm->restart = false;
401 		omap_mcpdm_reg_dump(mcpdm);
402 	}
403 
404 	return 0;
405 }
406 
omap_mcpdm_probe(struct snd_soc_dai * dai)407 static int omap_mcpdm_probe(struct snd_soc_dai *dai)
408 {
409 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
410 	int ret;
411 
412 	pm_runtime_enable(mcpdm->dev);
413 
414 	/* Disable lines while request is ongoing */
415 	pm_runtime_get_sync(mcpdm->dev);
416 	omap_mcpdm_write(mcpdm, MCPDM_REG_CTRL, 0x00);
417 
418 	ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler, 0, "McPDM",
419 			  (void *)mcpdm);
420 
421 	pm_runtime_put_sync(mcpdm->dev);
422 
423 	if (ret) {
424 		dev_err(mcpdm->dev, "Request for IRQ failed\n");
425 		pm_runtime_disable(mcpdm->dev);
426 	}
427 
428 	/* Configure McPDM threshold values */
429 	mcpdm->config[SNDRV_PCM_STREAM_PLAYBACK].threshold = 2;
430 	mcpdm->config[SNDRV_PCM_STREAM_CAPTURE].threshold =
431 							MCPDM_UP_THRES_MAX - 3;
432 
433 	snd_soc_dai_init_dma_data(dai,
434 				  &mcpdm->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
435 				  &mcpdm->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
436 
437 	return ret;
438 }
439 
omap_mcpdm_remove(struct snd_soc_dai * dai)440 static int omap_mcpdm_remove(struct snd_soc_dai *dai)
441 {
442 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(dai);
443 
444 	free_irq(mcpdm->irq, (void *)mcpdm);
445 	pm_runtime_disable(mcpdm->dev);
446 
447 	if (cpu_latency_qos_request_active(&mcpdm->pm_qos_req))
448 		cpu_latency_qos_remove_request(&mcpdm->pm_qos_req);
449 
450 	return 0;
451 }
452 
453 static const struct snd_soc_dai_ops omap_mcpdm_dai_ops = {
454 	.probe		= omap_mcpdm_probe,
455 	.remove		= omap_mcpdm_remove,
456 	.startup	= omap_mcpdm_dai_startup,
457 	.shutdown	= omap_mcpdm_dai_shutdown,
458 	.hw_params	= omap_mcpdm_dai_hw_params,
459 	.prepare	= omap_mcpdm_prepare,
460 	.probe_order	= SND_SOC_COMP_ORDER_LATE,
461 	.remove_order	= SND_SOC_COMP_ORDER_EARLY,
462 };
463 
464 #ifdef CONFIG_PM_SLEEP
omap_mcpdm_suspend(struct snd_soc_component * component)465 static int omap_mcpdm_suspend(struct snd_soc_component *component)
466 {
467 	struct omap_mcpdm *mcpdm = snd_soc_component_get_drvdata(component);
468 
469 	if (snd_soc_component_active(component)) {
470 		omap_mcpdm_stop(mcpdm);
471 		omap_mcpdm_close_streams(mcpdm);
472 	}
473 
474 	mcpdm->pm_active_count = 0;
475 	while (pm_runtime_active(mcpdm->dev)) {
476 		pm_runtime_put_sync(mcpdm->dev);
477 		mcpdm->pm_active_count++;
478 	}
479 
480 	return 0;
481 }
482 
omap_mcpdm_resume(struct snd_soc_component * component)483 static int omap_mcpdm_resume(struct snd_soc_component *component)
484 {
485 	struct omap_mcpdm *mcpdm = snd_soc_component_get_drvdata(component);
486 
487 	if (mcpdm->pm_active_count) {
488 		while (mcpdm->pm_active_count--)
489 			pm_runtime_get_sync(mcpdm->dev);
490 
491 		if (snd_soc_component_active(component)) {
492 			omap_mcpdm_open_streams(mcpdm);
493 			omap_mcpdm_start(mcpdm);
494 		}
495 	}
496 
497 
498 	return 0;
499 }
500 #else
501 #define omap_mcpdm_suspend NULL
502 #define omap_mcpdm_resume NULL
503 #endif
504 
505 #define OMAP_MCPDM_RATES	(SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000)
506 #define OMAP_MCPDM_FORMATS	SNDRV_PCM_FMTBIT_S32_LE
507 
508 static struct snd_soc_dai_driver omap_mcpdm_dai = {
509 	.playback = {
510 		.channels_min = 1,
511 		.channels_max = 5,
512 		.rates = OMAP_MCPDM_RATES,
513 		.formats = OMAP_MCPDM_FORMATS,
514 		.sig_bits = 24,
515 	},
516 	.capture = {
517 		.channels_min = 1,
518 		.channels_max = 3,
519 		.rates = OMAP_MCPDM_RATES,
520 		.formats = OMAP_MCPDM_FORMATS,
521 		.sig_bits = 24,
522 	},
523 	.ops = &omap_mcpdm_dai_ops,
524 };
525 
526 static const struct snd_soc_component_driver omap_mcpdm_component = {
527 	.name			= "omap-mcpdm",
528 	.suspend		= omap_mcpdm_suspend,
529 	.resume			= omap_mcpdm_resume,
530 	.legacy_dai_naming	= 1,
531 };
532 
omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime * rtd,u8 rx1,u8 rx2)533 void omap_mcpdm_configure_dn_offsets(struct snd_soc_pcm_runtime *rtd,
534 				    u8 rx1, u8 rx2)
535 {
536 	struct omap_mcpdm *mcpdm = snd_soc_dai_get_drvdata(asoc_rtd_to_cpu(rtd, 0));
537 
538 	mcpdm->dn_rx_offset = MCPDM_DNOFST_RX1(rx1) | MCPDM_DNOFST_RX2(rx2);
539 }
540 EXPORT_SYMBOL_GPL(omap_mcpdm_configure_dn_offsets);
541 
asoc_mcpdm_probe(struct platform_device * pdev)542 static int asoc_mcpdm_probe(struct platform_device *pdev)
543 {
544 	struct omap_mcpdm *mcpdm;
545 	struct resource *res;
546 	int ret;
547 
548 	mcpdm = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcpdm), GFP_KERNEL);
549 	if (!mcpdm)
550 		return -ENOMEM;
551 
552 	platform_set_drvdata(pdev, mcpdm);
553 
554 	mutex_init(&mcpdm->mutex);
555 
556 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
557 	if (res == NULL)
558 		return -ENOMEM;
559 
560 	mcpdm->dma_data[0].addr = res->start + MCPDM_REG_DN_DATA;
561 	mcpdm->dma_data[1].addr = res->start + MCPDM_REG_UP_DATA;
562 
563 	mcpdm->dma_data[0].filter_data = "dn_link";
564 	mcpdm->dma_data[1].filter_data = "up_link";
565 
566 	mcpdm->io_base = devm_platform_ioremap_resource_byname(pdev, "mpu");
567 	if (IS_ERR(mcpdm->io_base))
568 		return PTR_ERR(mcpdm->io_base);
569 
570 	mcpdm->irq = platform_get_irq(pdev, 0);
571 	if (mcpdm->irq < 0)
572 		return mcpdm->irq;
573 
574 	mcpdm->dev = &pdev->dev;
575 
576 	ret =  devm_snd_soc_register_component(&pdev->dev,
577 					       &omap_mcpdm_component,
578 					       &omap_mcpdm_dai, 1);
579 	if (ret)
580 		return ret;
581 
582 	return sdma_pcm_platform_register(&pdev->dev, "dn_link", "up_link");
583 }
584 
585 static const struct of_device_id omap_mcpdm_of_match[] = {
586 	{ .compatible = "ti,omap4-mcpdm", },
587 	{ }
588 };
589 MODULE_DEVICE_TABLE(of, omap_mcpdm_of_match);
590 
591 static struct platform_driver asoc_mcpdm_driver = {
592 	.driver = {
593 		.name	= "omap-mcpdm",
594 		.of_match_table = omap_mcpdm_of_match,
595 	},
596 
597 	.probe	= asoc_mcpdm_probe,
598 };
599 
600 module_platform_driver(asoc_mcpdm_driver);
601 
602 MODULE_ALIAS("platform:omap-mcpdm");
603 MODULE_AUTHOR("Misael Lopez Cruz <misael.lopez@ti.com>");
604 MODULE_DESCRIPTION("OMAP PDM SoC Interface");
605 MODULE_LICENSE("GPL");
606