1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // Driver for Microchip S/PDIF RX Controller
4 //
5 // Copyright (C) 2020 Microchip Technology Inc. and its subsidiaries
6 //
7 // Author: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
8
9 #include <linux/clk.h>
10 #include <linux/io.h>
11 #include <linux/module.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/regmap.h>
14 #include <linux/spinlock.h>
15
16 #include <sound/dmaengine_pcm.h>
17 #include <sound/pcm_params.h>
18 #include <sound/soc.h>
19
20 /*
21 * ---- S/PDIF Receiver Controller Register map ----
22 */
23 #define SPDIFRX_CR 0x00 /* Control Register */
24 #define SPDIFRX_MR 0x04 /* Mode Register */
25
26 #define SPDIFRX_IER 0x10 /* Interrupt Enable Register */
27 #define SPDIFRX_IDR 0x14 /* Interrupt Disable Register */
28 #define SPDIFRX_IMR 0x18 /* Interrupt Mask Register */
29 #define SPDIFRX_ISR 0x1c /* Interrupt Status Register */
30 #define SPDIFRX_RSR 0x20 /* Status Register */
31 #define SPDIFRX_RHR 0x24 /* Holding Register */
32
33 #define SPDIFRX_CHSR(channel, reg) \
34 (0x30 + (channel) * 0x30 + (reg) * 4) /* Channel x Status Registers */
35
36 #define SPDIFRX_CHUD(channel, reg) \
37 (0x48 + (channel) * 0x30 + (reg) * 4) /* Channel x User Data Registers */
38
39 #define SPDIFRX_WPMR 0xE4 /* Write Protection Mode Register */
40 #define SPDIFRX_WPSR 0xE8 /* Write Protection Status Register */
41
42 #define SPDIFRX_VERSION 0xFC /* Version Register */
43
44 /*
45 * ---- Control Register (Write-only) ----
46 */
47 #define SPDIFRX_CR_SWRST BIT(0) /* Software Reset */
48
49 /*
50 * ---- Mode Register (Read/Write) ----
51 */
52 /* Receive Enable */
53 #define SPDIFRX_MR_RXEN_MASK GENMASK(0, 0)
54 #define SPDIFRX_MR_RXEN_DISABLE (0 << 0) /* SPDIF Receiver Disabled */
55 #define SPDIFRX_MR_RXEN_ENABLE (1 << 0) /* SPDIF Receiver Enabled */
56
57 /* Validity Bit Mode */
58 #define SPDIFRX_MR_VBMODE_MASK GENAMSK(1, 1)
59 #define SPDIFRX_MR_VBMODE_ALWAYS_LOAD \
60 (0 << 1) /* Load sample regardless of validity bit value */
61 #define SPDIFRX_MR_VBMODE_DISCARD_IF_VB1 \
62 (1 << 1) /* Load sample only if validity bit is 0 */
63
64 /* Data Word Endian Mode */
65 #define SPDIFRX_MR_ENDIAN_MASK GENMASK(2, 2)
66 #define SPDIFRX_MR_ENDIAN_LITTLE (0 << 2) /* Little Endian Mode */
67 #define SPDIFRX_MR_ENDIAN_BIG (1 << 2) /* Big Endian Mode */
68
69 /* Parity Bit Mode */
70 #define SPDIFRX_MR_PBMODE_MASK GENMASK(3, 3)
71 #define SPDIFRX_MR_PBMODE_PARCHECK (0 << 3) /* Parity Check Enabled */
72 #define SPDIFRX_MR_PBMODE_NOPARCHECK (1 << 3) /* Parity Check Disabled */
73
74 /* Sample Data Width */
75 #define SPDIFRX_MR_DATAWIDTH_MASK GENMASK(5, 4)
76 #define SPDIFRX_MR_DATAWIDTH(width) \
77 (((6 - (width) / 4) << 4) & SPDIFRX_MR_DATAWIDTH_MASK)
78
79 /* Packed Data Mode in Receive Holding Register */
80 #define SPDIFRX_MR_PACK_MASK GENMASK(7, 7)
81 #define SPDIFRX_MR_PACK_DISABLED (0 << 7)
82 #define SPDIFRX_MR_PACK_ENABLED (1 << 7)
83
84 /* Start of Block Bit Mode */
85 #define SPDIFRX_MR_SBMODE_MASK GENMASK(8, 8)
86 #define SPDIFRX_MR_SBMODE_ALWAYS_LOAD (0 << 8)
87 #define SPDIFRX_MR_SBMODE_DISCARD (1 << 8)
88
89 /* Consecutive Preamble Error Threshold Automatic Restart */
90 #define SPDIFRX_MR_AUTORST_MASK GENMASK(24, 24)
91 #define SPDIFRX_MR_AUTORST_NOACTION (0 << 24)
92 #define SPDIFRX_MR_AUTORST_UNLOCK_ON_PRE_ERR (1 << 24)
93
94 /*
95 * ---- Interrupt Enable/Disable/Mask/Status Register (Write/Read-only) ----
96 */
97 #define SPDIFRX_IR_RXRDY BIT(0)
98 #define SPDIFRX_IR_LOCKED BIT(1)
99 #define SPDIFRX_IR_LOSS BIT(2)
100 #define SPDIFRX_IR_BLOCKEND BIT(3)
101 #define SPDIFRX_IR_SFE BIT(4)
102 #define SPDIFRX_IR_PAR_ERR BIT(5)
103 #define SPDIFRX_IR_OVERRUN BIT(6)
104 #define SPDIFRX_IR_RXFULL BIT(7)
105 #define SPDIFRX_IR_CSC(ch) BIT((ch) + 8)
106 #define SPDIFRX_IR_SECE BIT(10)
107 #define SPDIFRX_IR_BLOCKST BIT(11)
108 #define SPDIFRX_IR_NRZ_ERR BIT(12)
109 #define SPDIFRX_IR_PRE_ERR BIT(13)
110 #define SPDIFRX_IR_CP_ERR BIT(14)
111
112 /*
113 * ---- Receiver Status Register (Read/Write) ----
114 */
115 /* Enable Status */
116 #define SPDIFRX_RSR_ULOCK BIT(0)
117 #define SPDIFRX_RSR_BADF BIT(1)
118 #define SPDIFRX_RSR_LOWF BIT(2)
119 #define SPDIFRX_RSR_NOSIGNAL BIT(3)
120 #define SPDIFRX_RSR_IFS_MASK GENMASK(27, 16)
121 #define SPDIFRX_RSR_IFS(reg) \
122 (((reg) & SPDIFRX_RSR_IFS_MASK) >> 16)
123
124 /*
125 * ---- Version Register (Read-only) ----
126 */
127 #define SPDIFRX_VERSION_MASK GENMASK(11, 0)
128 #define SPDIFRX_VERSION_MFN_MASK GENMASK(18, 16)
129 #define SPDIFRX_VERSION_MFN(reg) (((reg) & SPDIFRX_VERSION_MFN_MASK) >> 16)
130
mchp_spdifrx_readable_reg(struct device * dev,unsigned int reg)131 static bool mchp_spdifrx_readable_reg(struct device *dev, unsigned int reg)
132 {
133 switch (reg) {
134 case SPDIFRX_MR:
135 case SPDIFRX_IMR:
136 case SPDIFRX_ISR:
137 case SPDIFRX_RSR:
138 case SPDIFRX_CHSR(0, 0):
139 case SPDIFRX_CHSR(0, 1):
140 case SPDIFRX_CHSR(0, 2):
141 case SPDIFRX_CHSR(0, 3):
142 case SPDIFRX_CHSR(0, 4):
143 case SPDIFRX_CHSR(0, 5):
144 case SPDIFRX_CHUD(0, 0):
145 case SPDIFRX_CHUD(0, 1):
146 case SPDIFRX_CHUD(0, 2):
147 case SPDIFRX_CHUD(0, 3):
148 case SPDIFRX_CHUD(0, 4):
149 case SPDIFRX_CHUD(0, 5):
150 case SPDIFRX_CHSR(1, 0):
151 case SPDIFRX_CHSR(1, 1):
152 case SPDIFRX_CHSR(1, 2):
153 case SPDIFRX_CHSR(1, 3):
154 case SPDIFRX_CHSR(1, 4):
155 case SPDIFRX_CHSR(1, 5):
156 case SPDIFRX_CHUD(1, 0):
157 case SPDIFRX_CHUD(1, 1):
158 case SPDIFRX_CHUD(1, 2):
159 case SPDIFRX_CHUD(1, 3):
160 case SPDIFRX_CHUD(1, 4):
161 case SPDIFRX_CHUD(1, 5):
162 case SPDIFRX_WPMR:
163 case SPDIFRX_WPSR:
164 case SPDIFRX_VERSION:
165 return true;
166 default:
167 return false;
168 }
169 }
170
mchp_spdifrx_writeable_reg(struct device * dev,unsigned int reg)171 static bool mchp_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
172 {
173 switch (reg) {
174 case SPDIFRX_CR:
175 case SPDIFRX_MR:
176 case SPDIFRX_IER:
177 case SPDIFRX_IDR:
178 case SPDIFRX_WPMR:
179 return true;
180 default:
181 return false;
182 }
183 }
184
mchp_spdifrx_precious_reg(struct device * dev,unsigned int reg)185 static bool mchp_spdifrx_precious_reg(struct device *dev, unsigned int reg)
186 {
187 switch (reg) {
188 case SPDIFRX_ISR:
189 case SPDIFRX_RHR:
190 return true;
191 default:
192 return false;
193 }
194 }
195
mchp_spdifrx_volatile_reg(struct device * dev,unsigned int reg)196 static bool mchp_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
197 {
198 switch (reg) {
199 case SPDIFRX_IMR:
200 case SPDIFRX_ISR:
201 case SPDIFRX_RSR:
202 case SPDIFRX_CHSR(0, 0):
203 case SPDIFRX_CHSR(0, 1):
204 case SPDIFRX_CHSR(0, 2):
205 case SPDIFRX_CHSR(0, 3):
206 case SPDIFRX_CHSR(0, 4):
207 case SPDIFRX_CHSR(0, 5):
208 case SPDIFRX_CHUD(0, 0):
209 case SPDIFRX_CHUD(0, 1):
210 case SPDIFRX_CHUD(0, 2):
211 case SPDIFRX_CHUD(0, 3):
212 case SPDIFRX_CHUD(0, 4):
213 case SPDIFRX_CHUD(0, 5):
214 case SPDIFRX_CHSR(1, 0):
215 case SPDIFRX_CHSR(1, 1):
216 case SPDIFRX_CHSR(1, 2):
217 case SPDIFRX_CHSR(1, 3):
218 case SPDIFRX_CHSR(1, 4):
219 case SPDIFRX_CHSR(1, 5):
220 case SPDIFRX_CHUD(1, 0):
221 case SPDIFRX_CHUD(1, 1):
222 case SPDIFRX_CHUD(1, 2):
223 case SPDIFRX_CHUD(1, 3):
224 case SPDIFRX_CHUD(1, 4):
225 case SPDIFRX_CHUD(1, 5):
226 case SPDIFRX_VERSION:
227 return true;
228 default:
229 return false;
230 }
231 }
232
233 static const struct regmap_config mchp_spdifrx_regmap_config = {
234 .reg_bits = 32,
235 .reg_stride = 4,
236 .val_bits = 32,
237 .max_register = SPDIFRX_VERSION,
238 .readable_reg = mchp_spdifrx_readable_reg,
239 .writeable_reg = mchp_spdifrx_writeable_reg,
240 .precious_reg = mchp_spdifrx_precious_reg,
241 .volatile_reg = mchp_spdifrx_volatile_reg,
242 .cache_type = REGCACHE_FLAT,
243 };
244
245 #define SPDIFRX_GCLK_RATIO_MIN (12 * 64)
246
247 #define SPDIFRX_CS_BITS 192
248 #define SPDIFRX_UD_BITS 192
249
250 #define SPDIFRX_CHANNELS 2
251
252 /**
253 * struct mchp_spdifrx_ch_stat: MCHP SPDIFRX channel status
254 * @data: channel status bits
255 * @done: completion to signal channel status bits acquisition done
256 */
257 struct mchp_spdifrx_ch_stat {
258 unsigned char data[SPDIFRX_CS_BITS / 8];
259 struct completion done;
260 };
261
262 /**
263 * struct mchp_spdifrx_user_data: MCHP SPDIFRX user data
264 * @data: user data bits
265 * @done: completion to signal user data bits acquisition done
266 */
267 struct mchp_spdifrx_user_data {
268 unsigned char data[SPDIFRX_UD_BITS / 8];
269 struct completion done;
270 };
271
272 /**
273 * struct mchp_spdifrx_mixer_control: MCHP SPDIFRX mixer control data structure
274 * @ch_stat: array of channel statuses
275 * @user_data: array of user data
276 * @ulock: ulock bit status
277 * @badf: badf bit status
278 * @signal: signal bit status
279 */
280 struct mchp_spdifrx_mixer_control {
281 struct mchp_spdifrx_ch_stat ch_stat[SPDIFRX_CHANNELS];
282 struct mchp_spdifrx_user_data user_data[SPDIFRX_CHANNELS];
283 bool ulock;
284 bool badf;
285 bool signal;
286 };
287
288 /**
289 * struct mchp_spdifrx_dev: MCHP SPDIFRX device data structure
290 * @capture: DAI DMA configuration data
291 * @control: mixer controls
292 * @mlock: mutex to protect concurency b/w configuration and control APIs
293 * @dev: struct device
294 * @regmap: regmap for this device
295 * @pclk: peripheral clock
296 * @gclk: generic clock
297 * @trigger_enabled: true if enabled though trigger() ops
298 */
299 struct mchp_spdifrx_dev {
300 struct snd_dmaengine_dai_dma_data capture;
301 struct mchp_spdifrx_mixer_control control;
302 struct mutex mlock;
303 struct device *dev;
304 struct regmap *regmap;
305 struct clk *pclk;
306 struct clk *gclk;
307 unsigned int trigger_enabled;
308 };
309
mchp_spdifrx_channel_status_read(struct mchp_spdifrx_dev * dev,int channel)310 static void mchp_spdifrx_channel_status_read(struct mchp_spdifrx_dev *dev,
311 int channel)
312 {
313 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
314 u8 *ch_stat = &ctrl->ch_stat[channel].data[0];
315 u32 val;
316 int i;
317
318 for (i = 0; i < ARRAY_SIZE(ctrl->ch_stat[channel].data) / 4; i++) {
319 regmap_read(dev->regmap, SPDIFRX_CHSR(channel, i), &val);
320 *ch_stat++ = val & 0xFF;
321 *ch_stat++ = (val >> 8) & 0xFF;
322 *ch_stat++ = (val >> 16) & 0xFF;
323 *ch_stat++ = (val >> 24) & 0xFF;
324 }
325 }
326
mchp_spdifrx_channel_user_data_read(struct mchp_spdifrx_dev * dev,int channel)327 static void mchp_spdifrx_channel_user_data_read(struct mchp_spdifrx_dev *dev,
328 int channel)
329 {
330 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
331 u8 *user_data = &ctrl->user_data[channel].data[0];
332 u32 val;
333 int i;
334
335 for (i = 0; i < ARRAY_SIZE(ctrl->user_data[channel].data) / 4; i++) {
336 regmap_read(dev->regmap, SPDIFRX_CHUD(channel, i), &val);
337 *user_data++ = val & 0xFF;
338 *user_data++ = (val >> 8) & 0xFF;
339 *user_data++ = (val >> 16) & 0xFF;
340 *user_data++ = (val >> 24) & 0xFF;
341 }
342 }
343
mchp_spdif_interrupt(int irq,void * dev_id)344 static irqreturn_t mchp_spdif_interrupt(int irq, void *dev_id)
345 {
346 struct mchp_spdifrx_dev *dev = dev_id;
347 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
348 u32 sr, imr, pending;
349 irqreturn_t ret = IRQ_NONE;
350 int ch;
351
352 regmap_read(dev->regmap, SPDIFRX_ISR, &sr);
353 regmap_read(dev->regmap, SPDIFRX_IMR, &imr);
354 pending = sr & imr;
355 dev_dbg(dev->dev, "ISR: %#x, IMR: %#x, pending: %#x\n", sr, imr,
356 pending);
357
358 if (!pending)
359 return IRQ_NONE;
360
361 if (pending & SPDIFRX_IR_BLOCKEND) {
362 for (ch = 0; ch < SPDIFRX_CHANNELS; ch++) {
363 mchp_spdifrx_channel_user_data_read(dev, ch);
364 complete(&ctrl->user_data[ch].done);
365 }
366 regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_BLOCKEND);
367 ret = IRQ_HANDLED;
368 }
369
370 for (ch = 0; ch < SPDIFRX_CHANNELS; ch++) {
371 if (pending & SPDIFRX_IR_CSC(ch)) {
372 mchp_spdifrx_channel_status_read(dev, ch);
373 complete(&ctrl->ch_stat[ch].done);
374 regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_CSC(ch));
375 ret = IRQ_HANDLED;
376 }
377 }
378
379 if (pending & SPDIFRX_IR_OVERRUN) {
380 dev_warn(dev->dev, "Overrun detected\n");
381 ret = IRQ_HANDLED;
382 }
383
384 return ret;
385 }
386
mchp_spdifrx_trigger(struct snd_pcm_substream * substream,int cmd,struct snd_soc_dai * dai)387 static int mchp_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd,
388 struct snd_soc_dai *dai)
389 {
390 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
391 int ret = 0;
392
393 switch (cmd) {
394 case SNDRV_PCM_TRIGGER_START:
395 case SNDRV_PCM_TRIGGER_RESUME:
396 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
397 mutex_lock(&dev->mlock);
398 /* Enable overrun interrupts */
399 regmap_write(dev->regmap, SPDIFRX_IER, SPDIFRX_IR_OVERRUN);
400
401 /* Enable receiver. */
402 regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
403 SPDIFRX_MR_RXEN_ENABLE);
404 dev->trigger_enabled = true;
405 mutex_unlock(&dev->mlock);
406 break;
407 case SNDRV_PCM_TRIGGER_STOP:
408 case SNDRV_PCM_TRIGGER_SUSPEND:
409 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
410 mutex_lock(&dev->mlock);
411 /* Disable overrun interrupts */
412 regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_OVERRUN);
413
414 /* Disable receiver. */
415 regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
416 SPDIFRX_MR_RXEN_DISABLE);
417 dev->trigger_enabled = false;
418 mutex_unlock(&dev->mlock);
419 break;
420 default:
421 ret = -EINVAL;
422 }
423
424 return ret;
425 }
426
mchp_spdifrx_hw_params(struct snd_pcm_substream * substream,struct snd_pcm_hw_params * params,struct snd_soc_dai * dai)427 static int mchp_spdifrx_hw_params(struct snd_pcm_substream *substream,
428 struct snd_pcm_hw_params *params,
429 struct snd_soc_dai *dai)
430 {
431 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
432 u32 mr = 0;
433 int ret;
434
435 dev_dbg(dev->dev, "%s() rate=%u format=%#x width=%u channels=%u\n",
436 __func__, params_rate(params), params_format(params),
437 params_width(params), params_channels(params));
438
439 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
440 dev_err(dev->dev, "Playback is not supported\n");
441 return -EINVAL;
442 }
443
444 if (params_channels(params) != SPDIFRX_CHANNELS) {
445 dev_err(dev->dev, "unsupported number of channels: %d\n",
446 params_channels(params));
447 return -EINVAL;
448 }
449
450 switch (params_format(params)) {
451 case SNDRV_PCM_FORMAT_S16_BE:
452 case SNDRV_PCM_FORMAT_S20_3BE:
453 case SNDRV_PCM_FORMAT_S24_3BE:
454 case SNDRV_PCM_FORMAT_S24_BE:
455 mr |= SPDIFRX_MR_ENDIAN_BIG;
456 fallthrough;
457 case SNDRV_PCM_FORMAT_S16_LE:
458 case SNDRV_PCM_FORMAT_S20_3LE:
459 case SNDRV_PCM_FORMAT_S24_3LE:
460 case SNDRV_PCM_FORMAT_S24_LE:
461 mr |= SPDIFRX_MR_DATAWIDTH(params_width(params));
462 break;
463 default:
464 dev_err(dev->dev, "unsupported PCM format: %d\n",
465 params_format(params));
466 return -EINVAL;
467 }
468
469 mutex_lock(&dev->mlock);
470 if (dev->trigger_enabled) {
471 dev_err(dev->dev, "PCM already running\n");
472 ret = -EBUSY;
473 goto unlock;
474 }
475
476 /* GCLK is enabled by runtime PM. */
477 clk_disable_unprepare(dev->gclk);
478
479 ret = clk_set_min_rate(dev->gclk, params_rate(params) *
480 SPDIFRX_GCLK_RATIO_MIN + 1);
481 if (ret) {
482 dev_err(dev->dev,
483 "unable to set gclk min rate: rate %u * ratio %u + 1\n",
484 params_rate(params), SPDIFRX_GCLK_RATIO_MIN);
485 /* Restore runtime PM state. */
486 clk_prepare_enable(dev->gclk);
487 goto unlock;
488 }
489 ret = clk_prepare_enable(dev->gclk);
490 if (ret) {
491 dev_err(dev->dev, "unable to enable gclk: %d\n", ret);
492 goto unlock;
493 }
494
495 dev_dbg(dev->dev, "GCLK range min set to %d\n",
496 params_rate(params) * SPDIFRX_GCLK_RATIO_MIN + 1);
497
498 ret = regmap_write(dev->regmap, SPDIFRX_MR, mr);
499
500 unlock:
501 mutex_unlock(&dev->mlock);
502
503 return ret;
504 }
505
506 #define MCHP_SPDIF_RATES SNDRV_PCM_RATE_8000_192000
507
508 #define MCHP_SPDIF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
509 SNDRV_PCM_FMTBIT_U16_BE | \
510 SNDRV_PCM_FMTBIT_S20_3LE | \
511 SNDRV_PCM_FMTBIT_S20_3BE | \
512 SNDRV_PCM_FMTBIT_S24_3LE | \
513 SNDRV_PCM_FMTBIT_S24_3BE | \
514 SNDRV_PCM_FMTBIT_S24_LE | \
515 SNDRV_PCM_FMTBIT_S24_BE \
516 )
517
mchp_spdifrx_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)518 static int mchp_spdifrx_info(struct snd_kcontrol *kcontrol,
519 struct snd_ctl_elem_info *uinfo)
520 {
521 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
522 uinfo->count = 1;
523
524 return 0;
525 }
526
mchp_spdifrx_cs_get(struct mchp_spdifrx_dev * dev,int channel,struct snd_ctl_elem_value * uvalue)527 static int mchp_spdifrx_cs_get(struct mchp_spdifrx_dev *dev,
528 int channel,
529 struct snd_ctl_elem_value *uvalue)
530 {
531 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
532 struct mchp_spdifrx_ch_stat *ch_stat = &ctrl->ch_stat[channel];
533 int ret = 0;
534
535 mutex_lock(&dev->mlock);
536
537 ret = pm_runtime_resume_and_get(dev->dev);
538 if (ret < 0)
539 goto unlock;
540
541 /*
542 * We may reach this point with both clocks enabled but the receiver
543 * still disabled. To void waiting for completion and return with
544 * timeout check the dev->trigger_enabled.
545 *
546 * To retrieve data:
547 * - if the receiver is enabled CSC IRQ will update the data in software
548 * caches (ch_stat->data)
549 * - otherwise we just update it here the software caches with latest
550 * available information and return it; in this case we don't need
551 * spin locking as the IRQ is disabled and will not be raised from
552 * anywhere else.
553 */
554
555 if (dev->trigger_enabled) {
556 reinit_completion(&ch_stat->done);
557 regmap_write(dev->regmap, SPDIFRX_IER, SPDIFRX_IR_CSC(channel));
558 /* Check for new data available */
559 ret = wait_for_completion_interruptible_timeout(&ch_stat->done,
560 msecs_to_jiffies(100));
561 /* Valid stream might not be present */
562 if (ret <= 0) {
563 dev_dbg(dev->dev, "channel status for channel %d timeout\n",
564 channel);
565 regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_CSC(channel));
566 ret = ret ? : -ETIMEDOUT;
567 goto pm_runtime_put;
568 } else {
569 ret = 0;
570 }
571 } else {
572 /* Update software cache with latest channel status. */
573 mchp_spdifrx_channel_status_read(dev, channel);
574 }
575
576 memcpy(uvalue->value.iec958.status, ch_stat->data,
577 sizeof(ch_stat->data));
578
579 pm_runtime_put:
580 pm_runtime_mark_last_busy(dev->dev);
581 pm_runtime_put_autosuspend(dev->dev);
582 unlock:
583 mutex_unlock(&dev->mlock);
584 return ret;
585 }
586
mchp_spdifrx_cs1_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)587 static int mchp_spdifrx_cs1_get(struct snd_kcontrol *kcontrol,
588 struct snd_ctl_elem_value *uvalue)
589 {
590 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
591 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
592
593 return mchp_spdifrx_cs_get(dev, 0, uvalue);
594 }
595
mchp_spdifrx_cs2_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)596 static int mchp_spdifrx_cs2_get(struct snd_kcontrol *kcontrol,
597 struct snd_ctl_elem_value *uvalue)
598 {
599 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
600 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
601
602 return mchp_spdifrx_cs_get(dev, 1, uvalue);
603 }
604
mchp_spdifrx_cs_mask(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)605 static int mchp_spdifrx_cs_mask(struct snd_kcontrol *kcontrol,
606 struct snd_ctl_elem_value *uvalue)
607 {
608 memset(uvalue->value.iec958.status, 0xff,
609 sizeof(uvalue->value.iec958.status));
610
611 return 0;
612 }
613
mchp_spdifrx_subcode_ch_get(struct mchp_spdifrx_dev * dev,int channel,struct snd_ctl_elem_value * uvalue)614 static int mchp_spdifrx_subcode_ch_get(struct mchp_spdifrx_dev *dev,
615 int channel,
616 struct snd_ctl_elem_value *uvalue)
617 {
618 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
619 struct mchp_spdifrx_user_data *user_data = &ctrl->user_data[channel];
620 int ret = 0;
621
622 mutex_lock(&dev->mlock);
623
624 ret = pm_runtime_resume_and_get(dev->dev);
625 if (ret < 0)
626 goto unlock;
627
628 /*
629 * We may reach this point with both clocks enabled but the receiver
630 * still disabled. To void waiting for completion to just timeout we
631 * check here the dev->trigger_enabled flag.
632 *
633 * To retrieve data:
634 * - if the receiver is enabled we need to wait for blockend IRQ to read
635 * data to and update it for us in software caches
636 * - otherwise reading the SPDIFRX_CHUD() registers is enough.
637 */
638
639 if (dev->trigger_enabled) {
640 reinit_completion(&user_data->done);
641 regmap_write(dev->regmap, SPDIFRX_IER, SPDIFRX_IR_BLOCKEND);
642 ret = wait_for_completion_interruptible_timeout(&user_data->done,
643 msecs_to_jiffies(100));
644 /* Valid stream might not be present. */
645 if (ret <= 0) {
646 dev_dbg(dev->dev, "user data for channel %d timeout\n",
647 channel);
648 regmap_write(dev->regmap, SPDIFRX_IDR, SPDIFRX_IR_BLOCKEND);
649 ret = ret ? : -ETIMEDOUT;
650 goto pm_runtime_put;
651 } else {
652 ret = 0;
653 }
654 } else {
655 /* Update software cache with last available data. */
656 mchp_spdifrx_channel_user_data_read(dev, channel);
657 }
658
659 memcpy(uvalue->value.iec958.subcode, user_data->data,
660 sizeof(user_data->data));
661
662 pm_runtime_put:
663 pm_runtime_mark_last_busy(dev->dev);
664 pm_runtime_put_autosuspend(dev->dev);
665 unlock:
666 mutex_unlock(&dev->mlock);
667 return ret;
668 }
669
mchp_spdifrx_subcode_ch1_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)670 static int mchp_spdifrx_subcode_ch1_get(struct snd_kcontrol *kcontrol,
671 struct snd_ctl_elem_value *uvalue)
672 {
673 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
674 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
675
676 return mchp_spdifrx_subcode_ch_get(dev, 0, uvalue);
677 }
678
mchp_spdifrx_subcode_ch2_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)679 static int mchp_spdifrx_subcode_ch2_get(struct snd_kcontrol *kcontrol,
680 struct snd_ctl_elem_value *uvalue)
681 {
682 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
683 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
684
685 return mchp_spdifrx_subcode_ch_get(dev, 1, uvalue);
686 }
687
mchp_spdifrx_boolean_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)688 static int mchp_spdifrx_boolean_info(struct snd_kcontrol *kcontrol,
689 struct snd_ctl_elem_info *uinfo)
690 {
691 uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
692 uinfo->count = 1;
693 uinfo->value.integer.min = 0;
694 uinfo->value.integer.max = 1;
695
696 return 0;
697 }
698
mchp_spdifrx_ulock_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)699 static int mchp_spdifrx_ulock_get(struct snd_kcontrol *kcontrol,
700 struct snd_ctl_elem_value *uvalue)
701 {
702 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
703 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
704 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
705 u32 val;
706 int ret;
707 bool ulock_old = ctrl->ulock;
708
709 mutex_lock(&dev->mlock);
710
711 ret = pm_runtime_resume_and_get(dev->dev);
712 if (ret < 0)
713 goto unlock;
714
715 /*
716 * The RSR.ULOCK has wrong value if both pclk and gclk are enabled
717 * and the receiver is disabled. Thus we take into account the
718 * dev->trigger_enabled here to return a real status.
719 */
720 if (dev->trigger_enabled) {
721 regmap_read(dev->regmap, SPDIFRX_RSR, &val);
722 ctrl->ulock = !(val & SPDIFRX_RSR_ULOCK);
723 } else {
724 ctrl->ulock = 0;
725 }
726
727 uvalue->value.integer.value[0] = ctrl->ulock;
728
729 pm_runtime_mark_last_busy(dev->dev);
730 pm_runtime_put_autosuspend(dev->dev);
731 unlock:
732 mutex_unlock(&dev->mlock);
733
734 return ulock_old != ctrl->ulock;
735 }
736
mchp_spdifrx_badf_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)737 static int mchp_spdifrx_badf_get(struct snd_kcontrol *kcontrol,
738 struct snd_ctl_elem_value *uvalue)
739 {
740 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
741 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
742 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
743 u32 val;
744 int ret;
745 bool badf_old = ctrl->badf;
746
747 mutex_lock(&dev->mlock);
748
749 ret = pm_runtime_resume_and_get(dev->dev);
750 if (ret < 0)
751 goto unlock;
752
753 /*
754 * The RSR.ULOCK has wrong value if both pclk and gclk are enabled
755 * and the receiver is disabled. Thus we take into account the
756 * dev->trigger_enabled here to return a real status.
757 */
758 if (dev->trigger_enabled) {
759 regmap_read(dev->regmap, SPDIFRX_RSR, &val);
760 ctrl->badf = !!(val & SPDIFRX_RSR_BADF);
761 } else {
762 ctrl->badf = 0;
763 }
764
765 pm_runtime_mark_last_busy(dev->dev);
766 pm_runtime_put_autosuspend(dev->dev);
767 unlock:
768 mutex_unlock(&dev->mlock);
769
770 uvalue->value.integer.value[0] = ctrl->badf;
771
772 return badf_old != ctrl->badf;
773 }
774
mchp_spdifrx_signal_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * uvalue)775 static int mchp_spdifrx_signal_get(struct snd_kcontrol *kcontrol,
776 struct snd_ctl_elem_value *uvalue)
777 {
778 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
779 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
780 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
781 u32 val = ~0U, loops = 10;
782 int ret;
783 bool signal_old = ctrl->signal;
784
785 mutex_lock(&dev->mlock);
786
787 ret = pm_runtime_resume_and_get(dev->dev);
788 if (ret < 0)
789 goto unlock;
790
791 /*
792 * To get the signal we need to have receiver enabled. This
793 * could be enabled also from trigger() function thus we need to
794 * take care of not disabling the receiver when it runs.
795 */
796 if (!dev->trigger_enabled) {
797 regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
798 SPDIFRX_MR_RXEN_ENABLE);
799
800 /* Wait for RSR.ULOCK bit. */
801 while (--loops) {
802 regmap_read(dev->regmap, SPDIFRX_RSR, &val);
803 if (!(val & SPDIFRX_RSR_ULOCK))
804 break;
805 usleep_range(100, 150);
806 }
807
808 regmap_update_bits(dev->regmap, SPDIFRX_MR, SPDIFRX_MR_RXEN_MASK,
809 SPDIFRX_MR_RXEN_DISABLE);
810 } else {
811 regmap_read(dev->regmap, SPDIFRX_RSR, &val);
812 }
813
814 pm_runtime_mark_last_busy(dev->dev);
815 pm_runtime_put_autosuspend(dev->dev);
816
817 unlock:
818 mutex_unlock(&dev->mlock);
819
820 if (!(val & SPDIFRX_RSR_ULOCK))
821 ctrl->signal = !(val & SPDIFRX_RSR_NOSIGNAL);
822 else
823 ctrl->signal = 0;
824 uvalue->value.integer.value[0] = ctrl->signal;
825
826 return signal_old != ctrl->signal;
827 }
828
mchp_spdifrx_rate_info(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_info * uinfo)829 static int mchp_spdifrx_rate_info(struct snd_kcontrol *kcontrol,
830 struct snd_ctl_elem_info *uinfo)
831 {
832 uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
833 uinfo->count = 1;
834 uinfo->value.integer.min = 0;
835 uinfo->value.integer.max = 192000;
836
837 return 0;
838 }
839
mchp_spdifrx_rate_get(struct snd_kcontrol * kcontrol,struct snd_ctl_elem_value * ucontrol)840 static int mchp_spdifrx_rate_get(struct snd_kcontrol *kcontrol,
841 struct snd_ctl_elem_value *ucontrol)
842 {
843 struct snd_soc_dai *dai = snd_kcontrol_chip(kcontrol);
844 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
845 unsigned long rate;
846 u32 val;
847 int ret;
848
849 mutex_lock(&dev->mlock);
850
851 ret = pm_runtime_resume_and_get(dev->dev);
852 if (ret < 0)
853 goto unlock;
854
855 /*
856 * The RSR.ULOCK has wrong value if both pclk and gclk are enabled
857 * and the receiver is disabled. Thus we take into account the
858 * dev->trigger_enabled here to return a real status.
859 */
860 if (dev->trigger_enabled) {
861 regmap_read(dev->regmap, SPDIFRX_RSR, &val);
862 /* If the receiver is not locked, ISF data is invalid. */
863 if (val & SPDIFRX_RSR_ULOCK || !(val & SPDIFRX_RSR_IFS_MASK)) {
864 ucontrol->value.integer.value[0] = 0;
865 goto pm_runtime_put;
866 }
867 } else {
868 /* Reveicer is not locked, IFS data is invalid. */
869 ucontrol->value.integer.value[0] = 0;
870 goto pm_runtime_put;
871 }
872
873 rate = clk_get_rate(dev->gclk);
874
875 ucontrol->value.integer.value[0] = rate / (32 * SPDIFRX_RSR_IFS(val));
876
877 pm_runtime_put:
878 pm_runtime_mark_last_busy(dev->dev);
879 pm_runtime_put_autosuspend(dev->dev);
880 unlock:
881 mutex_unlock(&dev->mlock);
882 return ret;
883 }
884
885 static struct snd_kcontrol_new mchp_spdifrx_ctrls[] = {
886 /* Channel status controller */
887 {
888 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
889 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT)
890 " Channel 1",
891 .access = SNDRV_CTL_ELEM_ACCESS_READ |
892 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
893 .info = mchp_spdifrx_info,
894 .get = mchp_spdifrx_cs1_get,
895 },
896 {
897 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
898 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT)
899 " Channel 2",
900 .access = SNDRV_CTL_ELEM_ACCESS_READ |
901 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
902 .info = mchp_spdifrx_info,
903 .get = mchp_spdifrx_cs2_get,
904 },
905 {
906 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
907 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
908 .access = SNDRV_CTL_ELEM_ACCESS_READ,
909 .info = mchp_spdifrx_info,
910 .get = mchp_spdifrx_cs_mask,
911 },
912 /* User bits controller */
913 {
914 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
915 .name = "IEC958 Subcode Capture Default Channel 1",
916 .access = SNDRV_CTL_ELEM_ACCESS_READ |
917 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
918 .info = mchp_spdifrx_info,
919 .get = mchp_spdifrx_subcode_ch1_get,
920 },
921 {
922 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
923 .name = "IEC958 Subcode Capture Default Channel 2",
924 .access = SNDRV_CTL_ELEM_ACCESS_READ |
925 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
926 .info = mchp_spdifrx_info,
927 .get = mchp_spdifrx_subcode_ch2_get,
928 },
929 /* Lock status */
930 {
931 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
932 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Unlocked",
933 .access = SNDRV_CTL_ELEM_ACCESS_READ |
934 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
935 .info = mchp_spdifrx_boolean_info,
936 .get = mchp_spdifrx_ulock_get,
937 },
938 /* Bad format */
939 {
940 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
941 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE)"Bad Format",
942 .access = SNDRV_CTL_ELEM_ACCESS_READ |
943 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
944 .info = mchp_spdifrx_boolean_info,
945 .get = mchp_spdifrx_badf_get,
946 },
947 /* Signal */
948 {
949 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
950 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Signal",
951 .access = SNDRV_CTL_ELEM_ACCESS_READ |
952 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
953 .info = mchp_spdifrx_boolean_info,
954 .get = mchp_spdifrx_signal_get,
955 },
956 /* Sampling rate */
957 {
958 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
959 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, NONE) "Rate",
960 .access = SNDRV_CTL_ELEM_ACCESS_READ |
961 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
962 .info = mchp_spdifrx_rate_info,
963 .get = mchp_spdifrx_rate_get,
964 },
965 };
966
mchp_spdifrx_dai_probe(struct snd_soc_dai * dai)967 static int mchp_spdifrx_dai_probe(struct snd_soc_dai *dai)
968 {
969 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
970 struct mchp_spdifrx_mixer_control *ctrl = &dev->control;
971 int ch;
972
973 snd_soc_dai_init_dma_data(dai, NULL, &dev->capture);
974
975 /* Software reset the IP */
976 regmap_write(dev->regmap, SPDIFRX_CR, SPDIFRX_CR_SWRST);
977
978 /* Default configuration */
979 regmap_write(dev->regmap, SPDIFRX_MR,
980 SPDIFRX_MR_VBMODE_DISCARD_IF_VB1 |
981 SPDIFRX_MR_SBMODE_DISCARD |
982 SPDIFRX_MR_AUTORST_NOACTION |
983 SPDIFRX_MR_PACK_DISABLED);
984
985 for (ch = 0; ch < SPDIFRX_CHANNELS; ch++) {
986 init_completion(&ctrl->ch_stat[ch].done);
987 init_completion(&ctrl->user_data[ch].done);
988 }
989
990 /* Add controls */
991 snd_soc_add_dai_controls(dai, mchp_spdifrx_ctrls,
992 ARRAY_SIZE(mchp_spdifrx_ctrls));
993
994 return 0;
995 }
996
mchp_spdifrx_dai_remove(struct snd_soc_dai * dai)997 static int mchp_spdifrx_dai_remove(struct snd_soc_dai *dai)
998 {
999 struct mchp_spdifrx_dev *dev = snd_soc_dai_get_drvdata(dai);
1000
1001 /* Disable interrupts */
1002 regmap_write(dev->regmap, SPDIFRX_IDR, GENMASK(14, 0));
1003
1004 return 0;
1005 }
1006
1007 static const struct snd_soc_dai_ops mchp_spdifrx_dai_ops = {
1008 .probe = mchp_spdifrx_dai_probe,
1009 .remove = mchp_spdifrx_dai_remove,
1010 .trigger = mchp_spdifrx_trigger,
1011 .hw_params = mchp_spdifrx_hw_params,
1012 };
1013
1014 static struct snd_soc_dai_driver mchp_spdifrx_dai = {
1015 .name = "mchp-spdifrx",
1016 .capture = {
1017 .stream_name = "S/PDIF Capture",
1018 .channels_min = SPDIFRX_CHANNELS,
1019 .channels_max = SPDIFRX_CHANNELS,
1020 .rates = MCHP_SPDIF_RATES,
1021 .formats = MCHP_SPDIF_FORMATS,
1022 },
1023 .ops = &mchp_spdifrx_dai_ops,
1024 };
1025
1026 static const struct snd_soc_component_driver mchp_spdifrx_component = {
1027 .name = "mchp-spdifrx",
1028 .legacy_dai_naming = 1,
1029 };
1030
1031 static const struct of_device_id mchp_spdifrx_dt_ids[] = {
1032 {
1033 .compatible = "microchip,sama7g5-spdifrx",
1034 },
1035 { /* sentinel */ }
1036 };
1037 MODULE_DEVICE_TABLE(of, mchp_spdifrx_dt_ids);
1038
mchp_spdifrx_runtime_suspend(struct device * dev)1039 static int mchp_spdifrx_runtime_suspend(struct device *dev)
1040 {
1041 struct mchp_spdifrx_dev *spdifrx = dev_get_drvdata(dev);
1042
1043 regcache_cache_only(spdifrx->regmap, true);
1044 clk_disable_unprepare(spdifrx->gclk);
1045 clk_disable_unprepare(spdifrx->pclk);
1046
1047 return 0;
1048 }
1049
mchp_spdifrx_runtime_resume(struct device * dev)1050 static int mchp_spdifrx_runtime_resume(struct device *dev)
1051 {
1052 struct mchp_spdifrx_dev *spdifrx = dev_get_drvdata(dev);
1053 int ret;
1054
1055 ret = clk_prepare_enable(spdifrx->pclk);
1056 if (ret)
1057 return ret;
1058
1059 ret = clk_prepare_enable(spdifrx->gclk);
1060 if (ret)
1061 goto disable_pclk;
1062
1063 regcache_cache_only(spdifrx->regmap, false);
1064 regcache_mark_dirty(spdifrx->regmap);
1065 ret = regcache_sync(spdifrx->regmap);
1066 if (ret) {
1067 regcache_cache_only(spdifrx->regmap, true);
1068 clk_disable_unprepare(spdifrx->gclk);
1069 disable_pclk:
1070 clk_disable_unprepare(spdifrx->pclk);
1071 }
1072
1073 return ret;
1074 }
1075
1076 static const struct dev_pm_ops mchp_spdifrx_pm_ops = {
1077 RUNTIME_PM_OPS(mchp_spdifrx_runtime_suspend, mchp_spdifrx_runtime_resume,
1078 NULL)
1079 };
1080
mchp_spdifrx_probe(struct platform_device * pdev)1081 static int mchp_spdifrx_probe(struct platform_device *pdev)
1082 {
1083 struct mchp_spdifrx_dev *dev;
1084 struct resource *mem;
1085 struct regmap *regmap;
1086 void __iomem *base;
1087 int irq;
1088 int err;
1089 u32 vers;
1090
1091 /* Get memory for driver data. */
1092 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
1093 if (!dev)
1094 return -ENOMEM;
1095
1096 /* Map I/O registers. */
1097 base = devm_platform_get_and_ioremap_resource(pdev, 0, &mem);
1098 if (IS_ERR(base))
1099 return PTR_ERR(base);
1100
1101 regmap = devm_regmap_init_mmio(&pdev->dev, base,
1102 &mchp_spdifrx_regmap_config);
1103 if (IS_ERR(regmap))
1104 return PTR_ERR(regmap);
1105
1106 /* Request IRQ. */
1107 irq = platform_get_irq(pdev, 0);
1108 if (irq < 0)
1109 return irq;
1110
1111 err = devm_request_irq(&pdev->dev, irq, mchp_spdif_interrupt, 0,
1112 dev_name(&pdev->dev), dev);
1113 if (err)
1114 return err;
1115
1116 /* Get the peripheral clock */
1117 dev->pclk = devm_clk_get(&pdev->dev, "pclk");
1118 if (IS_ERR(dev->pclk)) {
1119 err = PTR_ERR(dev->pclk);
1120 dev_err(&pdev->dev, "failed to get the peripheral clock: %d\n",
1121 err);
1122 return err;
1123 }
1124
1125 /* Get the generated clock */
1126 dev->gclk = devm_clk_get(&pdev->dev, "gclk");
1127 if (IS_ERR(dev->gclk)) {
1128 err = PTR_ERR(dev->gclk);
1129 dev_err(&pdev->dev,
1130 "failed to get the PMC generated clock: %d\n", err);
1131 return err;
1132 }
1133
1134 /*
1135 * Signal control need a valid rate on gclk. hw_params() configures
1136 * it propertly but requesting signal before any hw_params() has been
1137 * called lead to invalid value returned for signal. Thus, configure
1138 * gclk at a valid rate, here, in initialization, to simplify the
1139 * control path.
1140 */
1141 clk_set_min_rate(dev->gclk, 48000 * SPDIFRX_GCLK_RATIO_MIN + 1);
1142
1143 mutex_init(&dev->mlock);
1144
1145 dev->dev = &pdev->dev;
1146 dev->regmap = regmap;
1147 platform_set_drvdata(pdev, dev);
1148
1149 pm_runtime_enable(dev->dev);
1150 if (!pm_runtime_enabled(dev->dev)) {
1151 err = mchp_spdifrx_runtime_resume(dev->dev);
1152 if (err)
1153 goto pm_runtime_disable;
1154 }
1155
1156 dev->capture.addr = (dma_addr_t)mem->start + SPDIFRX_RHR;
1157 dev->capture.maxburst = 1;
1158
1159 err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
1160 if (err) {
1161 dev_err(&pdev->dev, "failed to register PCM: %d\n", err);
1162 goto pm_runtime_suspend;
1163 }
1164
1165 err = devm_snd_soc_register_component(&pdev->dev,
1166 &mchp_spdifrx_component,
1167 &mchp_spdifrx_dai, 1);
1168 if (err) {
1169 dev_err(&pdev->dev, "fail to register dai\n");
1170 goto pm_runtime_suspend;
1171 }
1172
1173 regmap_read(regmap, SPDIFRX_VERSION, &vers);
1174 dev_info(&pdev->dev, "hw version: %#lx\n", vers & SPDIFRX_VERSION_MASK);
1175
1176 return 0;
1177
1178 pm_runtime_suspend:
1179 if (!pm_runtime_status_suspended(dev->dev))
1180 mchp_spdifrx_runtime_suspend(dev->dev);
1181 pm_runtime_disable:
1182 pm_runtime_disable(dev->dev);
1183 return err;
1184 }
1185
mchp_spdifrx_remove(struct platform_device * pdev)1186 static void mchp_spdifrx_remove(struct platform_device *pdev)
1187 {
1188 struct mchp_spdifrx_dev *dev = platform_get_drvdata(pdev);
1189
1190 pm_runtime_disable(dev->dev);
1191 if (!pm_runtime_status_suspended(dev->dev))
1192 mchp_spdifrx_runtime_suspend(dev->dev);
1193 }
1194
1195 static struct platform_driver mchp_spdifrx_driver = {
1196 .probe = mchp_spdifrx_probe,
1197 .remove_new = mchp_spdifrx_remove,
1198 .driver = {
1199 .name = "mchp_spdifrx",
1200 .of_match_table = mchp_spdifrx_dt_ids,
1201 .pm = pm_ptr(&mchp_spdifrx_pm_ops),
1202 },
1203 };
1204
1205 module_platform_driver(mchp_spdifrx_driver);
1206
1207 MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu@microchip.com>");
1208 MODULE_DESCRIPTION("Microchip S/PDIF RX Controller Driver");
1209 MODULE_LICENSE("GPL v2");
1210