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[mirror_ubuntu-bionic-kernel.git] / sound / soc / stm / stm32_spdifrx.c
1 /*
2 * STM32 ALSA SoC Digital Audio Interface (SPDIF-rx) driver.
3 *
4 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
5 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
6 *
7 * License terms: GPL V2.0.
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published by
11 * the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
16 * details.
17 */
18
19 #include <linux/clk.h>
20 #include <linux/completion.h>
21 #include <linux/delay.h>
22 #include <linux/module.h>
23 #include <linux/of_platform.h>
24 #include <linux/regmap.h>
25 #include <linux/reset.h>
26
27 #include <sound/dmaengine_pcm.h>
28 #include <sound/pcm_params.h>
29
30 /* SPDIF-rx Register Map */
31 #define STM32_SPDIFRX_CR 0x00
32 #define STM32_SPDIFRX_IMR 0x04
33 #define STM32_SPDIFRX_SR 0x08
34 #define STM32_SPDIFRX_IFCR 0x0C
35 #define STM32_SPDIFRX_DR 0x10
36 #define STM32_SPDIFRX_CSR 0x14
37 #define STM32_SPDIFRX_DIR 0x18
38
39 /* Bit definition for SPDIF_CR register */
40 #define SPDIFRX_CR_SPDIFEN_SHIFT 0
41 #define SPDIFRX_CR_SPDIFEN_MASK GENMASK(1, SPDIFRX_CR_SPDIFEN_SHIFT)
42 #define SPDIFRX_CR_SPDIFENSET(x) ((x) << SPDIFRX_CR_SPDIFEN_SHIFT)
43
44 #define SPDIFRX_CR_RXDMAEN BIT(2)
45 #define SPDIFRX_CR_RXSTEO BIT(3)
46
47 #define SPDIFRX_CR_DRFMT_SHIFT 4
48 #define SPDIFRX_CR_DRFMT_MASK GENMASK(5, SPDIFRX_CR_DRFMT_SHIFT)
49 #define SPDIFRX_CR_DRFMTSET(x) ((x) << SPDIFRX_CR_DRFMT_SHIFT)
50
51 #define SPDIFRX_CR_PMSK BIT(6)
52 #define SPDIFRX_CR_VMSK BIT(7)
53 #define SPDIFRX_CR_CUMSK BIT(8)
54 #define SPDIFRX_CR_PTMSK BIT(9)
55 #define SPDIFRX_CR_CBDMAEN BIT(10)
56 #define SPDIFRX_CR_CHSEL_SHIFT 11
57 #define SPDIFRX_CR_CHSEL BIT(SPDIFRX_CR_CHSEL_SHIFT)
58
59 #define SPDIFRX_CR_NBTR_SHIFT 12
60 #define SPDIFRX_CR_NBTR_MASK GENMASK(13, SPDIFRX_CR_NBTR_SHIFT)
61 #define SPDIFRX_CR_NBTRSET(x) ((x) << SPDIFRX_CR_NBTR_SHIFT)
62
63 #define SPDIFRX_CR_WFA BIT(14)
64
65 #define SPDIFRX_CR_INSEL_SHIFT 16
66 #define SPDIFRX_CR_INSEL_MASK GENMASK(18, PDIFRX_CR_INSEL_SHIFT)
67 #define SPDIFRX_CR_INSELSET(x) ((x) << SPDIFRX_CR_INSEL_SHIFT)
68
69 #define SPDIFRX_CR_CKSEN_SHIFT 20
70 #define SPDIFRX_CR_CKSEN BIT(20)
71 #define SPDIFRX_CR_CKSBKPEN BIT(21)
72
73 /* Bit definition for SPDIFRX_IMR register */
74 #define SPDIFRX_IMR_RXNEI BIT(0)
75 #define SPDIFRX_IMR_CSRNEIE BIT(1)
76 #define SPDIFRX_IMR_PERRIE BIT(2)
77 #define SPDIFRX_IMR_OVRIE BIT(3)
78 #define SPDIFRX_IMR_SBLKIE BIT(4)
79 #define SPDIFRX_IMR_SYNCDIE BIT(5)
80 #define SPDIFRX_IMR_IFEIE BIT(6)
81
82 #define SPDIFRX_XIMR_MASK GENMASK(6, 0)
83
84 /* Bit definition for SPDIFRX_SR register */
85 #define SPDIFRX_SR_RXNE BIT(0)
86 #define SPDIFRX_SR_CSRNE BIT(1)
87 #define SPDIFRX_SR_PERR BIT(2)
88 #define SPDIFRX_SR_OVR BIT(3)
89 #define SPDIFRX_SR_SBD BIT(4)
90 #define SPDIFRX_SR_SYNCD BIT(5)
91 #define SPDIFRX_SR_FERR BIT(6)
92 #define SPDIFRX_SR_SERR BIT(7)
93 #define SPDIFRX_SR_TERR BIT(8)
94
95 #define SPDIFRX_SR_WIDTH5_SHIFT 16
96 #define SPDIFRX_SR_WIDTH5_MASK GENMASK(30, PDIFRX_SR_WIDTH5_SHIFT)
97 #define SPDIFRX_SR_WIDTH5SET(x) ((x) << SPDIFRX_SR_WIDTH5_SHIFT)
98
99 /* Bit definition for SPDIFRX_IFCR register */
100 #define SPDIFRX_IFCR_PERRCF BIT(2)
101 #define SPDIFRX_IFCR_OVRCF BIT(3)
102 #define SPDIFRX_IFCR_SBDCF BIT(4)
103 #define SPDIFRX_IFCR_SYNCDCF BIT(5)
104
105 #define SPDIFRX_XIFCR_MASK GENMASK(5, 2)
106
107 /* Bit definition for SPDIFRX_DR register (DRFMT = 0b00) */
108 #define SPDIFRX_DR0_DR_SHIFT 0
109 #define SPDIFRX_DR0_DR_MASK GENMASK(23, SPDIFRX_DR0_DR_SHIFT)
110 #define SPDIFRX_DR0_DRSET(x) ((x) << SPDIFRX_DR0_DR_SHIFT)
111
112 #define SPDIFRX_DR0_PE BIT(24)
113
114 #define SPDIFRX_DR0_V BIT(25)
115 #define SPDIFRX_DR0_U BIT(26)
116 #define SPDIFRX_DR0_C BIT(27)
117
118 #define SPDIFRX_DR0_PT_SHIFT 28
119 #define SPDIFRX_DR0_PT_MASK GENMASK(29, SPDIFRX_DR0_PT_SHIFT)
120 #define SPDIFRX_DR0_PTSET(x) ((x) << SPDIFRX_DR0_PT_SHIFT)
121
122 /* Bit definition for SPDIFRX_DR register (DRFMT = 0b01) */
123 #define SPDIFRX_DR1_PE BIT(0)
124 #define SPDIFRX_DR1_V BIT(1)
125 #define SPDIFRX_DR1_U BIT(2)
126 #define SPDIFRX_DR1_C BIT(3)
127
128 #define SPDIFRX_DR1_PT_SHIFT 4
129 #define SPDIFRX_DR1_PT_MASK GENMASK(5, SPDIFRX_DR1_PT_SHIFT)
130 #define SPDIFRX_DR1_PTSET(x) ((x) << SPDIFRX_DR1_PT_SHIFT)
131
132 #define SPDIFRX_DR1_DR_SHIFT 8
133 #define SPDIFRX_DR1_DR_MASK GENMASK(31, SPDIFRX_DR1_DR_SHIFT)
134 #define SPDIFRX_DR1_DRSET(x) ((x) << SPDIFRX_DR1_DR_SHIFT)
135
136 /* Bit definition for SPDIFRX_DR register (DRFMT = 0b10) */
137 #define SPDIFRX_DR1_DRNL1_SHIFT 0
138 #define SPDIFRX_DR1_DRNL1_MASK GENMASK(15, SPDIFRX_DR1_DRNL1_SHIFT)
139 #define SPDIFRX_DR1_DRNL1SET(x) ((x) << SPDIFRX_DR1_DRNL1_SHIFT)
140
141 #define SPDIFRX_DR1_DRNL2_SHIFT 16
142 #define SPDIFRX_DR1_DRNL2_MASK GENMASK(31, SPDIFRX_DR1_DRNL2_SHIFT)
143 #define SPDIFRX_DR1_DRNL2SET(x) ((x) << SPDIFRX_DR1_DRNL2_SHIFT)
144
145 /* Bit definition for SPDIFRX_CSR register */
146 #define SPDIFRX_CSR_USR_SHIFT 0
147 #define SPDIFRX_CSR_USR_MASK GENMASK(15, SPDIFRX_CSR_USR_SHIFT)
148 #define SPDIFRX_CSR_USRGET(x) (((x) & SPDIFRX_CSR_USR_MASK)\
149 >> SPDIFRX_CSR_USR_SHIFT)
150
151 #define SPDIFRX_CSR_CS_SHIFT 16
152 #define SPDIFRX_CSR_CS_MASK GENMASK(23, SPDIFRX_CSR_CS_SHIFT)
153 #define SPDIFRX_CSR_CSGET(x) (((x) & SPDIFRX_CSR_CS_MASK)\
154 >> SPDIFRX_CSR_CS_SHIFT)
155
156 #define SPDIFRX_CSR_SOB BIT(24)
157
158 /* Bit definition for SPDIFRX_DIR register */
159 #define SPDIFRX_DIR_THI_SHIFT 0
160 #define SPDIFRX_DIR_THI_MASK GENMASK(12, SPDIFRX_DIR_THI_SHIFT)
161 #define SPDIFRX_DIR_THI_SET(x) ((x) << SPDIFRX_DIR_THI_SHIFT)
162
163 #define SPDIFRX_DIR_TLO_SHIFT 16
164 #define SPDIFRX_DIR_TLO_MASK GENMASK(28, SPDIFRX_DIR_TLO_SHIFT)
165 #define SPDIFRX_DIR_TLO_SET(x) ((x) << SPDIFRX_DIR_TLO_SHIFT)
166
167 #define SPDIFRX_SPDIFEN_DISABLE 0x0
168 #define SPDIFRX_SPDIFEN_SYNC 0x1
169 #define SPDIFRX_SPDIFEN_ENABLE 0x3
170
171 #define SPDIFRX_IN1 0x1
172 #define SPDIFRX_IN2 0x2
173 #define SPDIFRX_IN3 0x3
174 #define SPDIFRX_IN4 0x4
175 #define SPDIFRX_IN5 0x5
176 #define SPDIFRX_IN6 0x6
177 #define SPDIFRX_IN7 0x7
178 #define SPDIFRX_IN8 0x8
179
180 #define SPDIFRX_NBTR_NONE 0x0
181 #define SPDIFRX_NBTR_3 0x1
182 #define SPDIFRX_NBTR_15 0x2
183 #define SPDIFRX_NBTR_63 0x3
184
185 #define SPDIFRX_DRFMT_RIGHT 0x0
186 #define SPDIFRX_DRFMT_LEFT 0x1
187 #define SPDIFRX_DRFMT_PACKED 0x2
188
189 /* 192 CS bits in S/PDIF frame. i.e 24 CS bytes */
190 #define SPDIFRX_CS_BYTES_NB 24
191 #define SPDIFRX_UB_BYTES_NB 48
192
193 /*
194 * CSR register is retrieved as a 32 bits word
195 * It contains 1 channel status byte and 2 user data bytes
196 * 2 S/PDIF frames are acquired to get all CS/UB bits
197 */
198 #define SPDIFRX_CSR_BUF_LENGTH (SPDIFRX_CS_BYTES_NB * 4 * 2)
199
200 /**
201 * struct stm32_spdifrx_data - private data of SPDIFRX
202 * @pdev: device data pointer
203 * @base: mmio register base virtual address
204 * @regmap: SPDIFRX register map pointer
205 * @regmap_conf: SPDIFRX register map configuration pointer
206 * @cs_completion: channel status retrieving completion
207 * @kclk: kernel clock feeding the SPDIFRX clock generator
208 * @dma_params: dma configuration data for rx channel
209 * @substream: PCM substream data pointer
210 * @dmab: dma buffer info pointer
211 * @ctrl_chan: dma channel for S/PDIF control bits
212 * @desc:dma async transaction descriptor
213 * @slave_config: dma slave channel runtime config pointer
214 * @phys_addr: SPDIFRX registers physical base address
215 * @lock: synchronization enabling lock
216 * @cs: channel status buffer
217 * @ub: user data buffer
218 * @irq: SPDIFRX interrupt line
219 * @refcount: keep count of opened DMA channels
220 */
221 struct stm32_spdifrx_data {
222 struct platform_device *pdev;
223 void __iomem *base;
224 struct regmap *regmap;
225 const struct regmap_config *regmap_conf;
226 struct completion cs_completion;
227 struct clk *kclk;
228 struct snd_dmaengine_dai_dma_data dma_params;
229 struct snd_pcm_substream *substream;
230 struct snd_dma_buffer *dmab;
231 struct dma_chan *ctrl_chan;
232 struct dma_async_tx_descriptor *desc;
233 struct dma_slave_config slave_config;
234 dma_addr_t phys_addr;
235 spinlock_t lock; /* Sync enabling lock */
236 unsigned char cs[SPDIFRX_CS_BYTES_NB];
237 unsigned char ub[SPDIFRX_UB_BYTES_NB];
238 int irq;
239 int refcount;
240 };
241
242 static void stm32_spdifrx_dma_complete(void *data)
243 {
244 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)data;
245 struct platform_device *pdev = spdifrx->pdev;
246 u32 *p_start = (u32 *)spdifrx->dmab->area;
247 u32 *p_end = p_start + (2 * SPDIFRX_CS_BYTES_NB) - 1;
248 u32 *ptr = p_start;
249 u16 *ub_ptr = (short *)spdifrx->ub;
250 int i = 0;
251
252 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
253 SPDIFRX_CR_CBDMAEN,
254 (unsigned int)~SPDIFRX_CR_CBDMAEN);
255
256 if (!spdifrx->dmab->area)
257 return;
258
259 while (ptr <= p_end) {
260 if (*ptr & SPDIFRX_CSR_SOB)
261 break;
262 ptr++;
263 }
264
265 if (ptr > p_end) {
266 dev_err(&pdev->dev, "Start of S/PDIF block not found\n");
267 return;
268 }
269
270 while (i < SPDIFRX_CS_BYTES_NB) {
271 spdifrx->cs[i] = (unsigned char)SPDIFRX_CSR_CSGET(*ptr);
272 *ub_ptr++ = SPDIFRX_CSR_USRGET(*ptr++);
273 if (ptr > p_end) {
274 dev_err(&pdev->dev, "Failed to get channel status\n");
275 return;
276 }
277 i++;
278 }
279
280 complete(&spdifrx->cs_completion);
281 }
282
283 static int stm32_spdifrx_dma_ctrl_start(struct stm32_spdifrx_data *spdifrx)
284 {
285 dma_cookie_t cookie;
286 int err;
287
288 spdifrx->desc = dmaengine_prep_slave_single(spdifrx->ctrl_chan,
289 spdifrx->dmab->addr,
290 SPDIFRX_CSR_BUF_LENGTH,
291 DMA_DEV_TO_MEM,
292 DMA_CTRL_ACK);
293 if (!spdifrx->desc)
294 return -EINVAL;
295
296 spdifrx->desc->callback = stm32_spdifrx_dma_complete;
297 spdifrx->desc->callback_param = spdifrx;
298 cookie = dmaengine_submit(spdifrx->desc);
299 err = dma_submit_error(cookie);
300 if (err)
301 return -EINVAL;
302
303 dma_async_issue_pending(spdifrx->ctrl_chan);
304
305 return 0;
306 }
307
308 static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx)
309 {
310 dmaengine_terminate_async(spdifrx->ctrl_chan);
311 }
312
313 static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx)
314 {
315 int cr, cr_mask, imr, ret;
316
317 /* Enable IRQs */
318 imr = SPDIFRX_IMR_IFEIE | SPDIFRX_IMR_SYNCDIE | SPDIFRX_IMR_PERRIE;
319 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, imr, imr);
320 if (ret)
321 return ret;
322
323 spin_lock(&spdifrx->lock);
324
325 spdifrx->refcount++;
326
327 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr);
328
329 if (!(cr & SPDIFRX_CR_SPDIFEN_MASK)) {
330 /*
331 * Start sync if SPDIFRX is still in idle state.
332 * SPDIFRX reception enabled when sync done
333 */
334 dev_dbg(&spdifrx->pdev->dev, "start synchronization\n");
335
336 /*
337 * SPDIFRX configuration:
338 * Wait for activity before starting sync process. This avoid
339 * to issue sync errors when spdif signal is missing on input.
340 * Preamble, CS, user, validity and parity error bits not copied
341 * to DR register.
342 */
343 cr = SPDIFRX_CR_WFA | SPDIFRX_CR_PMSK | SPDIFRX_CR_VMSK |
344 SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO;
345 cr_mask = cr;
346
347 cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC);
348 cr_mask |= SPDIFRX_CR_SPDIFEN_MASK;
349 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
350 cr_mask, cr);
351 if (ret < 0)
352 dev_err(&spdifrx->pdev->dev,
353 "Failed to start synchronization\n");
354 }
355
356 spin_unlock(&spdifrx->lock);
357
358 return ret;
359 }
360
361 static void stm32_spdifrx_stop(struct stm32_spdifrx_data *spdifrx)
362 {
363 int cr, cr_mask, reg;
364
365 spin_lock(&spdifrx->lock);
366
367 if (--spdifrx->refcount) {
368 spin_unlock(&spdifrx->lock);
369 return;
370 }
371
372 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
373 cr_mask = SPDIFRX_CR_SPDIFEN_MASK | SPDIFRX_CR_RXDMAEN;
374
375 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, cr_mask, cr);
376
377 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
378 SPDIFRX_XIMR_MASK, 0);
379
380 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
381 SPDIFRX_XIFCR_MASK, SPDIFRX_XIFCR_MASK);
382
383 /* dummy read to clear CSRNE and RXNE in status register */
384 regmap_read(spdifrx->regmap, STM32_SPDIFRX_DR, &reg);
385 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CSR, &reg);
386
387 spin_unlock(&spdifrx->lock);
388 }
389
390 static int stm32_spdifrx_dma_ctrl_register(struct device *dev,
391 struct stm32_spdifrx_data *spdifrx)
392 {
393 int ret;
394
395 spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl");
396 if (IS_ERR(spdifrx->ctrl_chan)) {
397 dev_err(dev, "dma_request_slave_channel failed\n");
398 return PTR_ERR(spdifrx->ctrl_chan);
399 }
400
401 spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer),
402 GFP_KERNEL);
403 if (!spdifrx->dmab)
404 return -ENOMEM;
405
406 spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM;
407 spdifrx->dmab->dev.dev = dev;
408 ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev,
409 SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab);
410 if (ret < 0) {
411 dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret);
412 return ret;
413 }
414
415 spdifrx->slave_config.direction = DMA_DEV_TO_MEM;
416 spdifrx->slave_config.src_addr = (dma_addr_t)(spdifrx->phys_addr +
417 STM32_SPDIFRX_CSR);
418 spdifrx->slave_config.dst_addr = spdifrx->dmab->addr;
419 spdifrx->slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
420 spdifrx->slave_config.src_maxburst = 1;
421
422 ret = dmaengine_slave_config(spdifrx->ctrl_chan,
423 &spdifrx->slave_config);
424 if (ret < 0) {
425 dev_err(dev, "dmaengine_slave_config returned error %d\n", ret);
426 spdifrx->ctrl_chan = NULL;
427 }
428
429 return ret;
430 };
431
432 static const char * const spdifrx_enum_input[] = {
433 "in0", "in1", "in2", "in3"
434 };
435
436 /* By default CS bits are retrieved from channel A */
437 static const char * const spdifrx_enum_cs_channel[] = {
438 "A", "B"
439 };
440
441 static SOC_ENUM_SINGLE_DECL(ctrl_enum_input,
442 STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT,
443 spdifrx_enum_input);
444
445 static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel,
446 STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT,
447 spdifrx_enum_cs_channel);
448
449 static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol,
450 struct snd_ctl_elem_info *uinfo)
451 {
452 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
453 uinfo->count = 1;
454
455 return 0;
456 }
457
458 static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol,
459 struct snd_ctl_elem_info *uinfo)
460 {
461 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
462 uinfo->count = 1;
463
464 return 0;
465 }
466
467 static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
468 {
469 int ret = 0;
470
471 memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
472 memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
473
474 ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
475 if (ret < 0)
476 return ret;
477
478 ret = clk_prepare_enable(spdifrx->kclk);
479 if (ret) {
480 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
481 return ret;
482 }
483
484 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
485 SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN);
486 if (ret < 0)
487 goto end;
488
489 ret = stm32_spdifrx_start_sync(spdifrx);
490 if (ret < 0)
491 goto end;
492
493 if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion,
494 msecs_to_jiffies(100))
495 <= 0) {
496 dev_err(&spdifrx->pdev->dev, "Failed to get control data\n");
497 ret = -EAGAIN;
498 }
499
500 stm32_spdifrx_stop(spdifrx);
501 stm32_spdifrx_dma_ctrl_stop(spdifrx);
502
503 end:
504 clk_disable_unprepare(spdifrx->kclk);
505
506 return ret;
507 }
508
509 static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol,
510 struct snd_ctl_elem_value *ucontrol)
511 {
512 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
513 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
514
515 stm32_spdifrx_get_ctrl_data(spdifrx);
516
517 ucontrol->value.iec958.status[0] = spdifrx->cs[0];
518 ucontrol->value.iec958.status[1] = spdifrx->cs[1];
519 ucontrol->value.iec958.status[2] = spdifrx->cs[2];
520 ucontrol->value.iec958.status[3] = spdifrx->cs[3];
521 ucontrol->value.iec958.status[4] = spdifrx->cs[4];
522
523 return 0;
524 }
525
526 static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol,
527 struct snd_ctl_elem_value *ucontrol)
528 {
529 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
530 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
531
532 stm32_spdifrx_get_ctrl_data(spdifrx);
533
534 ucontrol->value.iec958.status[0] = spdifrx->ub[0];
535 ucontrol->value.iec958.status[1] = spdifrx->ub[1];
536 ucontrol->value.iec958.status[2] = spdifrx->ub[2];
537 ucontrol->value.iec958.status[3] = spdifrx->ub[3];
538 ucontrol->value.iec958.status[4] = spdifrx->ub[4];
539
540 return 0;
541 }
542
543 static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = {
544 /* Channel status control */
545 {
546 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
547 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
548 .access = SNDRV_CTL_ELEM_ACCESS_READ |
549 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
550 .info = stm32_spdifrx_info,
551 .get = stm32_spdifrx_capture_get,
552 },
553 /* User bits control */
554 {
555 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
556 .name = "IEC958 User Bit Capture Default",
557 .access = SNDRV_CTL_ELEM_ACCESS_READ |
558 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
559 .info = stm32_spdifrx_ub_info,
560 .get = stm32_spdif_user_bits_get,
561 },
562 };
563
564 static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = {
565 SOC_ENUM("SPDIFRX input", ctrl_enum_input),
566 SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel),
567 };
568
569 static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai)
570 {
571 int ret;
572
573 ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls,
574 ARRAY_SIZE(stm32_spdifrx_iec_ctrls));
575 if (ret < 0)
576 return ret;
577
578 return snd_soc_add_component_controls(cpu_dai->component,
579 stm32_spdifrx_ctrls,
580 ARRAY_SIZE(stm32_spdifrx_ctrls));
581 }
582
583 static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai)
584 {
585 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev);
586
587 spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr +
588 STM32_SPDIFRX_DR);
589 spdifrx->dma_params.maxburst = 1;
590
591 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
592
593 return stm32_spdifrx_dai_register_ctrls(cpu_dai);
594 }
595
596 static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg)
597 {
598 switch (reg) {
599 case STM32_SPDIFRX_CR:
600 case STM32_SPDIFRX_IMR:
601 case STM32_SPDIFRX_SR:
602 case STM32_SPDIFRX_IFCR:
603 case STM32_SPDIFRX_DR:
604 case STM32_SPDIFRX_CSR:
605 case STM32_SPDIFRX_DIR:
606 return true;
607 default:
608 return false;
609 }
610 }
611
612 static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
613 {
614 if (reg == STM32_SPDIFRX_DR)
615 return true;
616
617 return false;
618 }
619
620 static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
621 {
622 switch (reg) {
623 case STM32_SPDIFRX_CR:
624 case STM32_SPDIFRX_IMR:
625 case STM32_SPDIFRX_IFCR:
626 return true;
627 default:
628 return false;
629 }
630 }
631
632 static const struct regmap_config stm32_h7_spdifrx_regmap_conf = {
633 .reg_bits = 32,
634 .reg_stride = 4,
635 .val_bits = 32,
636 .max_register = STM32_SPDIFRX_DIR,
637 .readable_reg = stm32_spdifrx_readable_reg,
638 .volatile_reg = stm32_spdifrx_volatile_reg,
639 .writeable_reg = stm32_spdifrx_writeable_reg,
640 .fast_io = true,
641 };
642
643 static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
644 {
645 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid;
646 struct snd_pcm_substream *substream = spdifrx->substream;
647 struct platform_device *pdev = spdifrx->pdev;
648 unsigned int cr, mask, sr, imr;
649 unsigned int flags;
650 int err = 0, err_xrun = 0;
651
652 regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr);
653 regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr);
654
655 mask = imr & SPDIFRX_XIMR_MASK;
656 /* SERR, TERR, FERR IRQs are generated if IFEIE is set */
657 if (mask & SPDIFRX_IMR_IFEIE)
658 mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2);
659
660 flags = sr & mask;
661 if (!flags) {
662 dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n",
663 sr, imr);
664 return IRQ_NONE;
665 }
666
667 /* Clear IRQs */
668 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
669 SPDIFRX_XIFCR_MASK, flags);
670
671 if (flags & SPDIFRX_SR_PERR) {
672 dev_dbg(&pdev->dev, "Parity error\n");
673 err_xrun = 1;
674 }
675
676 if (flags & SPDIFRX_SR_OVR) {
677 dev_dbg(&pdev->dev, "Overrun error\n");
678 err_xrun = 1;
679 }
680
681 if (flags & SPDIFRX_SR_SBD)
682 dev_dbg(&pdev->dev, "Synchronization block detected\n");
683
684 if (flags & SPDIFRX_SR_SYNCD) {
685 dev_dbg(&pdev->dev, "Synchronization done\n");
686
687 /* Enable spdifrx */
688 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE);
689 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
690 SPDIFRX_CR_SPDIFEN_MASK, cr);
691 }
692
693 if (flags & SPDIFRX_SR_FERR) {
694 dev_dbg(&pdev->dev, "Frame error\n");
695 err = 1;
696 }
697
698 if (flags & SPDIFRX_SR_SERR) {
699 dev_dbg(&pdev->dev, "Synchronization error\n");
700 err = 1;
701 }
702
703 if (flags & SPDIFRX_SR_TERR) {
704 dev_dbg(&pdev->dev, "Timeout error\n");
705 err = 1;
706 }
707
708 if (err) {
709 /* SPDIFRX in STATE_STOP. Disable SPDIFRX to clear errors */
710 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
711 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
712 SPDIFRX_CR_SPDIFEN_MASK, cr);
713
714 if (substream)
715 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
716
717 return IRQ_HANDLED;
718 }
719
720 if (err_xrun && substream)
721 snd_pcm_stop_xrun(substream);
722
723 return IRQ_HANDLED;
724 }
725
726 static int stm32_spdifrx_startup(struct snd_pcm_substream *substream,
727 struct snd_soc_dai *cpu_dai)
728 {
729 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
730 int ret;
731
732 spdifrx->substream = substream;
733
734 ret = clk_prepare_enable(spdifrx->kclk);
735 if (ret)
736 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
737
738 return ret;
739 }
740
741 static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream,
742 struct snd_pcm_hw_params *params,
743 struct snd_soc_dai *cpu_dai)
744 {
745 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
746 int data_size = params_width(params);
747 int fmt;
748
749 switch (data_size) {
750 case 16:
751 fmt = SPDIFRX_DRFMT_PACKED;
752 break;
753 case 32:
754 fmt = SPDIFRX_DRFMT_LEFT;
755 break;
756 default:
757 dev_err(&spdifrx->pdev->dev, "Unexpected data format\n");
758 return -EINVAL;
759 }
760
761 /*
762 * Set buswidth to 4 bytes for all data formats.
763 * Packed format: transfer 2 x 2 bytes samples
764 * Left format: transfer 1 x 3 bytes samples + 1 dummy byte
765 */
766 spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
767 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
768
769 return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
770 SPDIFRX_CR_DRFMT_MASK,
771 SPDIFRX_CR_DRFMTSET(fmt));
772 }
773
774 static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd,
775 struct snd_soc_dai *cpu_dai)
776 {
777 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
778 int ret = 0;
779
780 switch (cmd) {
781 case SNDRV_PCM_TRIGGER_START:
782 case SNDRV_PCM_TRIGGER_RESUME:
783 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
784 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
785 SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE);
786
787 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
788 SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN);
789
790 ret = stm32_spdifrx_start_sync(spdifrx);
791 break;
792 case SNDRV_PCM_TRIGGER_SUSPEND:
793 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
794 case SNDRV_PCM_TRIGGER_STOP:
795 stm32_spdifrx_stop(spdifrx);
796 break;
797 default:
798 return -EINVAL;
799 }
800
801 return ret;
802 }
803
804 static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream,
805 struct snd_soc_dai *cpu_dai)
806 {
807 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
808
809 spdifrx->substream = NULL;
810 clk_disable_unprepare(spdifrx->kclk);
811 }
812
813 static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = {
814 .startup = stm32_spdifrx_startup,
815 .hw_params = stm32_spdifrx_hw_params,
816 .trigger = stm32_spdifrx_trigger,
817 .shutdown = stm32_spdifrx_shutdown,
818 };
819
820 static struct snd_soc_dai_driver stm32_spdifrx_dai[] = {
821 {
822 .name = "spdifrx-capture-cpu-dai",
823 .probe = stm32_spdifrx_dai_probe,
824 .capture = {
825 .stream_name = "CPU-Capture",
826 .channels_min = 1,
827 .channels_max = 2,
828 .rates = SNDRV_PCM_RATE_8000_192000,
829 .formats = SNDRV_PCM_FMTBIT_S32_LE |
830 SNDRV_PCM_FMTBIT_S16_LE,
831 },
832 .ops = &stm32_spdifrx_pcm_dai_ops,
833 }
834 };
835
836 static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = {
837 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
838 .buffer_bytes_max = 8 * PAGE_SIZE,
839 .period_bytes_max = 2048, /* MDMA constraint */
840 .periods_min = 2,
841 .periods_max = 8,
842 };
843
844 static const struct snd_soc_component_driver stm32_spdifrx_component = {
845 .name = "stm32-spdifrx",
846 };
847
848 static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = {
849 .pcm_hardware = &stm32_spdifrx_pcm_hw,
850 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
851 };
852
853 static const struct of_device_id stm32_spdifrx_ids[] = {
854 {
855 .compatible = "st,stm32h7-spdifrx",
856 .data = &stm32_h7_spdifrx_regmap_conf
857 },
858 {}
859 };
860
861 static int stm_spdifrx_parse_of(struct platform_device *pdev,
862 struct stm32_spdifrx_data *spdifrx)
863 {
864 struct device_node *np = pdev->dev.of_node;
865 const struct of_device_id *of_id;
866 struct resource *res;
867
868 if (!np)
869 return -ENODEV;
870
871 of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev);
872 if (of_id)
873 spdifrx->regmap_conf =
874 (const struct regmap_config *)of_id->data;
875 else
876 return -EINVAL;
877
878 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
879 spdifrx->base = devm_ioremap_resource(&pdev->dev, res);
880 if (IS_ERR(spdifrx->base))
881 return PTR_ERR(spdifrx->base);
882
883 spdifrx->phys_addr = res->start;
884
885 spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk");
886 if (IS_ERR(spdifrx->kclk)) {
887 dev_err(&pdev->dev, "Could not get kclk\n");
888 return PTR_ERR(spdifrx->kclk);
889 }
890
891 spdifrx->irq = platform_get_irq(pdev, 0);
892 if (spdifrx->irq < 0) {
893 dev_err(&pdev->dev, "No irq for node %s\n", pdev->name);
894 return spdifrx->irq;
895 }
896
897 return 0;
898 }
899
900 static int stm32_spdifrx_probe(struct platform_device *pdev)
901 {
902 struct stm32_spdifrx_data *spdifrx;
903 struct reset_control *rst;
904 const struct snd_dmaengine_pcm_config *pcm_config = NULL;
905 int ret;
906
907 spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL);
908 if (!spdifrx)
909 return -ENOMEM;
910
911 spdifrx->pdev = pdev;
912 init_completion(&spdifrx->cs_completion);
913 spin_lock_init(&spdifrx->lock);
914
915 platform_set_drvdata(pdev, spdifrx);
916
917 ret = stm_spdifrx_parse_of(pdev, spdifrx);
918 if (ret)
919 return ret;
920
921 spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk",
922 spdifrx->base,
923 spdifrx->regmap_conf);
924 if (IS_ERR(spdifrx->regmap)) {
925 dev_err(&pdev->dev, "Regmap init failed\n");
926 return PTR_ERR(spdifrx->regmap);
927 }
928
929 ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0,
930 dev_name(&pdev->dev), spdifrx);
931 if (ret) {
932 dev_err(&pdev->dev, "IRQ request returned %d\n", ret);
933 return ret;
934 }
935
936 rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
937 if (!IS_ERR(rst)) {
938 reset_control_assert(rst);
939 udelay(2);
940 reset_control_deassert(rst);
941 }
942
943 ret = devm_snd_soc_register_component(&pdev->dev,
944 &stm32_spdifrx_component,
945 stm32_spdifrx_dai,
946 ARRAY_SIZE(stm32_spdifrx_dai));
947 if (ret)
948 return ret;
949
950 ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx);
951 if (ret)
952 goto error;
953
954 pcm_config = &stm32_spdifrx_pcm_config;
955 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0);
956 if (ret) {
957 dev_err(&pdev->dev, "PCM DMA register returned %d\n", ret);
958 goto error;
959 }
960
961 return 0;
962
963 error:
964 if (!IS_ERR(spdifrx->ctrl_chan))
965 dma_release_channel(spdifrx->ctrl_chan);
966 if (spdifrx->dmab)
967 snd_dma_free_pages(spdifrx->dmab);
968
969 return ret;
970 }
971
972 static int stm32_spdifrx_remove(struct platform_device *pdev)
973 {
974 struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev);
975
976 if (spdifrx->ctrl_chan)
977 dma_release_channel(spdifrx->ctrl_chan);
978
979 if (spdifrx->dmab)
980 snd_dma_free_pages(spdifrx->dmab);
981
982 return 0;
983 }
984
985 MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids);
986
987 static struct platform_driver stm32_spdifrx_driver = {
988 .driver = {
989 .name = "st,stm32-spdifrx",
990 .of_match_table = stm32_spdifrx_ids,
991 },
992 .probe = stm32_spdifrx_probe,
993 .remove = stm32_spdifrx_remove,
994 };
995
996 module_platform_driver(stm32_spdifrx_driver);
997
998 MODULE_DESCRIPTION("STM32 Soc spdifrx Interface");
999 MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>");
1000 MODULE_ALIAS("platform:stm32-spdifrx");
1001 MODULE_LICENSE("GPL v2");
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