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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * STM32 ALSA SoC Digital Audio Interface (SPDIF-rx) driver.
4 *
5 * Copyright (C) 2017, STMicroelectronics - All Rights Reserved
6 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.
7 */
8
9#include <linux/bitfield.h>
10#include <linux/clk.h>
11#include <linux/completion.h>
12#include <linux/delay.h>
13#include <linux/module.h>
14#include <linux/of_platform.h>
15#include <linux/pinctrl/consumer.h>
16#include <linux/regmap.h>
17#include <linux/reset.h>
18
19#include <sound/dmaengine_pcm.h>
20#include <sound/pcm_params.h>
21
22/* SPDIF-rx Register Map */
23#define STM32_SPDIFRX_CR 0x00
24#define STM32_SPDIFRX_IMR 0x04
25#define STM32_SPDIFRX_SR 0x08
26#define STM32_SPDIFRX_IFCR 0x0C
27#define STM32_SPDIFRX_DR 0x10
28#define STM32_SPDIFRX_CSR 0x14
29#define STM32_SPDIFRX_DIR 0x18
30#define STM32_SPDIFRX_VERR 0x3F4
31#define STM32_SPDIFRX_IDR 0x3F8
32#define STM32_SPDIFRX_SIDR 0x3FC
33
34/* Bit definition for SPDIF_CR register */
35#define SPDIFRX_CR_SPDIFEN_SHIFT 0
36#define SPDIFRX_CR_SPDIFEN_MASK GENMASK(1, SPDIFRX_CR_SPDIFEN_SHIFT)
37#define SPDIFRX_CR_SPDIFENSET(x) ((x) << SPDIFRX_CR_SPDIFEN_SHIFT)
38
39#define SPDIFRX_CR_RXDMAEN BIT(2)
40#define SPDIFRX_CR_RXSTEO BIT(3)
41
42#define SPDIFRX_CR_DRFMT_SHIFT 4
43#define SPDIFRX_CR_DRFMT_MASK GENMASK(5, SPDIFRX_CR_DRFMT_SHIFT)
44#define SPDIFRX_CR_DRFMTSET(x) ((x) << SPDIFRX_CR_DRFMT_SHIFT)
45
46#define SPDIFRX_CR_PMSK BIT(6)
47#define SPDIFRX_CR_VMSK BIT(7)
48#define SPDIFRX_CR_CUMSK BIT(8)
49#define SPDIFRX_CR_PTMSK BIT(9)
50#define SPDIFRX_CR_CBDMAEN BIT(10)
51#define SPDIFRX_CR_CHSEL_SHIFT 11
52#define SPDIFRX_CR_CHSEL BIT(SPDIFRX_CR_CHSEL_SHIFT)
53
54#define SPDIFRX_CR_NBTR_SHIFT 12
55#define SPDIFRX_CR_NBTR_MASK GENMASK(13, SPDIFRX_CR_NBTR_SHIFT)
56#define SPDIFRX_CR_NBTRSET(x) ((x) << SPDIFRX_CR_NBTR_SHIFT)
57
58#define SPDIFRX_CR_WFA BIT(14)
59
60#define SPDIFRX_CR_INSEL_SHIFT 16
61#define SPDIFRX_CR_INSEL_MASK GENMASK(18, PDIFRX_CR_INSEL_SHIFT)
62#define SPDIFRX_CR_INSELSET(x) ((x) << SPDIFRX_CR_INSEL_SHIFT)
63
64#define SPDIFRX_CR_CKSEN_SHIFT 20
65#define SPDIFRX_CR_CKSEN BIT(20)
66#define SPDIFRX_CR_CKSBKPEN BIT(21)
67
68/* Bit definition for SPDIFRX_IMR register */
69#define SPDIFRX_IMR_RXNEI BIT(0)
70#define SPDIFRX_IMR_CSRNEIE BIT(1)
71#define SPDIFRX_IMR_PERRIE BIT(2)
72#define SPDIFRX_IMR_OVRIE BIT(3)
73#define SPDIFRX_IMR_SBLKIE BIT(4)
74#define SPDIFRX_IMR_SYNCDIE BIT(5)
75#define SPDIFRX_IMR_IFEIE BIT(6)
76
77#define SPDIFRX_XIMR_MASK GENMASK(6, 0)
78
79/* Bit definition for SPDIFRX_SR register */
80#define SPDIFRX_SR_RXNE BIT(0)
81#define SPDIFRX_SR_CSRNE BIT(1)
82#define SPDIFRX_SR_PERR BIT(2)
83#define SPDIFRX_SR_OVR BIT(3)
84#define SPDIFRX_SR_SBD BIT(4)
85#define SPDIFRX_SR_SYNCD BIT(5)
86#define SPDIFRX_SR_FERR BIT(6)
87#define SPDIFRX_SR_SERR BIT(7)
88#define SPDIFRX_SR_TERR BIT(8)
89
90#define SPDIFRX_SR_WIDTH5_SHIFT 16
91#define SPDIFRX_SR_WIDTH5_MASK GENMASK(30, PDIFRX_SR_WIDTH5_SHIFT)
92#define SPDIFRX_SR_WIDTH5SET(x) ((x) << SPDIFRX_SR_WIDTH5_SHIFT)
93
94/* Bit definition for SPDIFRX_IFCR register */
95#define SPDIFRX_IFCR_PERRCF BIT(2)
96#define SPDIFRX_IFCR_OVRCF BIT(3)
97#define SPDIFRX_IFCR_SBDCF BIT(4)
98#define SPDIFRX_IFCR_SYNCDCF BIT(5)
99
100#define SPDIFRX_XIFCR_MASK GENMASK(5, 2)
101
102/* Bit definition for SPDIFRX_DR register (DRFMT = 0b00) */
103#define SPDIFRX_DR0_DR_SHIFT 0
104#define SPDIFRX_DR0_DR_MASK GENMASK(23, SPDIFRX_DR0_DR_SHIFT)
105#define SPDIFRX_DR0_DRSET(x) ((x) << SPDIFRX_DR0_DR_SHIFT)
106
107#define SPDIFRX_DR0_PE BIT(24)
108
109#define SPDIFRX_DR0_V BIT(25)
110#define SPDIFRX_DR0_U BIT(26)
111#define SPDIFRX_DR0_C BIT(27)
112
113#define SPDIFRX_DR0_PT_SHIFT 28
114#define SPDIFRX_DR0_PT_MASK GENMASK(29, SPDIFRX_DR0_PT_SHIFT)
115#define SPDIFRX_DR0_PTSET(x) ((x) << SPDIFRX_DR0_PT_SHIFT)
116
117/* Bit definition for SPDIFRX_DR register (DRFMT = 0b01) */
118#define SPDIFRX_DR1_PE BIT(0)
119#define SPDIFRX_DR1_V BIT(1)
120#define SPDIFRX_DR1_U BIT(2)
121#define SPDIFRX_DR1_C BIT(3)
122
123#define SPDIFRX_DR1_PT_SHIFT 4
124#define SPDIFRX_DR1_PT_MASK GENMASK(5, SPDIFRX_DR1_PT_SHIFT)
125#define SPDIFRX_DR1_PTSET(x) ((x) << SPDIFRX_DR1_PT_SHIFT)
126
127#define SPDIFRX_DR1_DR_SHIFT 8
128#define SPDIFRX_DR1_DR_MASK GENMASK(31, SPDIFRX_DR1_DR_SHIFT)
129#define SPDIFRX_DR1_DRSET(x) ((x) << SPDIFRX_DR1_DR_SHIFT)
130
131/* Bit definition for SPDIFRX_DR register (DRFMT = 0b10) */
132#define SPDIFRX_DR1_DRNL1_SHIFT 0
133#define SPDIFRX_DR1_DRNL1_MASK GENMASK(15, SPDIFRX_DR1_DRNL1_SHIFT)
134#define SPDIFRX_DR1_DRNL1SET(x) ((x) << SPDIFRX_DR1_DRNL1_SHIFT)
135
136#define SPDIFRX_DR1_DRNL2_SHIFT 16
137#define SPDIFRX_DR1_DRNL2_MASK GENMASK(31, SPDIFRX_DR1_DRNL2_SHIFT)
138#define SPDIFRX_DR1_DRNL2SET(x) ((x) << SPDIFRX_DR1_DRNL2_SHIFT)
139
140/* Bit definition for SPDIFRX_CSR register */
141#define SPDIFRX_CSR_USR_SHIFT 0
142#define SPDIFRX_CSR_USR_MASK GENMASK(15, SPDIFRX_CSR_USR_SHIFT)
143#define SPDIFRX_CSR_USRGET(x) (((x) & SPDIFRX_CSR_USR_MASK)\
144 >> SPDIFRX_CSR_USR_SHIFT)
145
146#define SPDIFRX_CSR_CS_SHIFT 16
147#define SPDIFRX_CSR_CS_MASK GENMASK(23, SPDIFRX_CSR_CS_SHIFT)
148#define SPDIFRX_CSR_CSGET(x) (((x) & SPDIFRX_CSR_CS_MASK)\
149 >> SPDIFRX_CSR_CS_SHIFT)
150
151#define SPDIFRX_CSR_SOB BIT(24)
152
153/* Bit definition for SPDIFRX_DIR register */
154#define SPDIFRX_DIR_THI_SHIFT 0
155#define SPDIFRX_DIR_THI_MASK GENMASK(12, SPDIFRX_DIR_THI_SHIFT)
156#define SPDIFRX_DIR_THI_SET(x) ((x) << SPDIFRX_DIR_THI_SHIFT)
157
158#define SPDIFRX_DIR_TLO_SHIFT 16
159#define SPDIFRX_DIR_TLO_MASK GENMASK(28, SPDIFRX_DIR_TLO_SHIFT)
160#define SPDIFRX_DIR_TLO_SET(x) ((x) << SPDIFRX_DIR_TLO_SHIFT)
161
162#define SPDIFRX_SPDIFEN_DISABLE 0x0
163#define SPDIFRX_SPDIFEN_SYNC 0x1
164#define SPDIFRX_SPDIFEN_ENABLE 0x3
165
166/* Bit definition for SPDIFRX_VERR register */
167#define SPDIFRX_VERR_MIN_MASK GENMASK(3, 0)
168#define SPDIFRX_VERR_MAJ_MASK GENMASK(7, 4)
169
170/* Bit definition for SPDIFRX_IDR register */
171#define SPDIFRX_IDR_ID_MASK GENMASK(31, 0)
172
173/* Bit definition for SPDIFRX_SIDR register */
174#define SPDIFRX_SIDR_SID_MASK GENMASK(31, 0)
175
176#define SPDIFRX_IPIDR_NUMBER 0x00130041
177
178#define SPDIFRX_IN1 0x1
179#define SPDIFRX_IN2 0x2
180#define SPDIFRX_IN3 0x3
181#define SPDIFRX_IN4 0x4
182#define SPDIFRX_IN5 0x5
183#define SPDIFRX_IN6 0x6
184#define SPDIFRX_IN7 0x7
185#define SPDIFRX_IN8 0x8
186
187#define SPDIFRX_NBTR_NONE 0x0
188#define SPDIFRX_NBTR_3 0x1
189#define SPDIFRX_NBTR_15 0x2
190#define SPDIFRX_NBTR_63 0x3
191
192#define SPDIFRX_DRFMT_RIGHT 0x0
193#define SPDIFRX_DRFMT_LEFT 0x1
194#define SPDIFRX_DRFMT_PACKED 0x2
195
196/* 192 CS bits in S/PDIF frame. i.e 24 CS bytes */
197#define SPDIFRX_CS_BYTES_NB 24
198#define SPDIFRX_UB_BYTES_NB 48
199
200/*
201 * CSR register is retrieved as a 32 bits word
202 * It contains 1 channel status byte and 2 user data bytes
203 * 2 S/PDIF frames are acquired to get all CS/UB bits
204 */
205#define SPDIFRX_CSR_BUF_LENGTH (SPDIFRX_CS_BYTES_NB * 4 * 2)
206
207/**
208 * struct stm32_spdifrx_data - private data of SPDIFRX
209 * @pdev: device data pointer
210 * @base: mmio register base virtual address
211 * @regmap: SPDIFRX register map pointer
212 * @regmap_conf: SPDIFRX register map configuration pointer
213 * @cs_completion: channel status retrieving completion
214 * @kclk: kernel clock feeding the SPDIFRX clock generator
215 * @dma_params: dma configuration data for rx channel
216 * @substream: PCM substream data pointer
217 * @dmab: dma buffer info pointer
218 * @ctrl_chan: dma channel for S/PDIF control bits
219 * @desc:dma async transaction descriptor
220 * @slave_config: dma slave channel runtime config pointer
221 * @phys_addr: SPDIFRX registers physical base address
222 * @lock: synchronization enabling lock
223 * @cs: channel status buffer
224 * @ub: user data buffer
225 * @irq: SPDIFRX interrupt line
226 * @refcount: keep count of opened DMA channels
227 */
228struct stm32_spdifrx_data {
229 struct platform_device *pdev;
230 void __iomem *base;
231 struct regmap *regmap;
232 const struct regmap_config *regmap_conf;
233 struct completion cs_completion;
234 struct clk *kclk;
235 struct snd_dmaengine_dai_dma_data dma_params;
236 struct snd_pcm_substream *substream;
237 struct snd_dma_buffer *dmab;
238 struct dma_chan *ctrl_chan;
239 struct dma_async_tx_descriptor *desc;
240 struct dma_slave_config slave_config;
241 dma_addr_t phys_addr;
242 spinlock_t lock; /* Sync enabling lock */
243 unsigned char cs[SPDIFRX_CS_BYTES_NB];
244 unsigned char ub[SPDIFRX_UB_BYTES_NB];
245 int irq;
246 int refcount;
247};
248
249static void stm32_spdifrx_dma_complete(void *data)
250{
251 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)data;
252 struct platform_device *pdev = spdifrx->pdev;
253 u32 *p_start = (u32 *)spdifrx->dmab->area;
254 u32 *p_end = p_start + (2 * SPDIFRX_CS_BYTES_NB) - 1;
255 u32 *ptr = p_start;
256 u16 *ub_ptr = (short *)spdifrx->ub;
257 int i = 0;
258
259 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
260 SPDIFRX_CR_CBDMAEN,
261 (unsigned int)~SPDIFRX_CR_CBDMAEN);
262
263 if (!spdifrx->dmab->area)
264 return;
265
266 while (ptr <= p_end) {
267 if (*ptr & SPDIFRX_CSR_SOB)
268 break;
269 ptr++;
270 }
271
272 if (ptr > p_end) {
273 dev_err(&pdev->dev, "Start of S/PDIF block not found\n");
274 return;
275 }
276
277 while (i < SPDIFRX_CS_BYTES_NB) {
278 spdifrx->cs[i] = (unsigned char)SPDIFRX_CSR_CSGET(*ptr);
279 *ub_ptr++ = SPDIFRX_CSR_USRGET(*ptr++);
280 if (ptr > p_end) {
281 dev_err(&pdev->dev, "Failed to get channel status\n");
282 return;
283 }
284 i++;
285 }
286
287 complete(&spdifrx->cs_completion);
288}
289
290static int stm32_spdifrx_dma_ctrl_start(struct stm32_spdifrx_data *spdifrx)
291{
292 dma_cookie_t cookie;
293 int err;
294
295 spdifrx->desc = dmaengine_prep_slave_single(spdifrx->ctrl_chan,
296 spdifrx->dmab->addr,
297 SPDIFRX_CSR_BUF_LENGTH,
298 DMA_DEV_TO_MEM,
299 DMA_CTRL_ACK);
300 if (!spdifrx->desc)
301 return -EINVAL;
302
303 spdifrx->desc->callback = stm32_spdifrx_dma_complete;
304 spdifrx->desc->callback_param = spdifrx;
305 cookie = dmaengine_submit(spdifrx->desc);
306 err = dma_submit_error(cookie);
307 if (err)
308 return -EINVAL;
309
310 dma_async_issue_pending(spdifrx->ctrl_chan);
311
312 return 0;
313}
314
315static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx)
316{
317 dmaengine_terminate_async(spdifrx->ctrl_chan);
318}
319
320static int stm32_spdifrx_start_sync(struct stm32_spdifrx_data *spdifrx)
321{
322 int cr, cr_mask, imr, ret;
323
324 /* Enable IRQs */
325 imr = SPDIFRX_IMR_IFEIE | SPDIFRX_IMR_SYNCDIE | SPDIFRX_IMR_PERRIE;
326 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR, imr, imr);
327 if (ret)
328 return ret;
329
330 spin_lock(&spdifrx->lock);
331
332 spdifrx->refcount++;
333
334 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr);
335
336 if (!(cr & SPDIFRX_CR_SPDIFEN_MASK)) {
337 /*
338 * Start sync if SPDIFRX is still in idle state.
339 * SPDIFRX reception enabled when sync done
340 */
341 dev_dbg(&spdifrx->pdev->dev, "start synchronization\n");
342
343 /*
344 * SPDIFRX configuration:
345 * Wait for activity before starting sync process. This avoid
346 * to issue sync errors when spdif signal is missing on input.
347 * Preamble, CS, user, validity and parity error bits not copied
348 * to DR register.
349 */
350 cr = SPDIFRX_CR_WFA | SPDIFRX_CR_PMSK | SPDIFRX_CR_VMSK |
351 SPDIFRX_CR_CUMSK | SPDIFRX_CR_PTMSK | SPDIFRX_CR_RXSTEO;
352 cr_mask = cr;
353
354 cr |= SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_SYNC);
355 cr_mask |= SPDIFRX_CR_SPDIFEN_MASK;
356 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
357 cr_mask, cr);
358 if (ret < 0)
359 dev_err(&spdifrx->pdev->dev,
360 "Failed to start synchronization\n");
361 }
362
363 spin_unlock(&spdifrx->lock);
364
365 return ret;
366}
367
368static void stm32_spdifrx_stop(struct stm32_spdifrx_data *spdifrx)
369{
370 int cr, cr_mask, reg;
371
372 spin_lock(&spdifrx->lock);
373
374 if (--spdifrx->refcount) {
375 spin_unlock(&spdifrx->lock);
376 return;
377 }
378
379 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
380 cr_mask = SPDIFRX_CR_SPDIFEN_MASK | SPDIFRX_CR_RXDMAEN;
381
382 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR, cr_mask, cr);
383
384 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
385 SPDIFRX_XIMR_MASK, 0);
386
387 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
388 SPDIFRX_XIFCR_MASK, SPDIFRX_XIFCR_MASK);
389
390 /* dummy read to clear CSRNE and RXNE in status register */
391 regmap_read(spdifrx->regmap, STM32_SPDIFRX_DR, ®);
392 regmap_read(spdifrx->regmap, STM32_SPDIFRX_CSR, ®);
393
394 spin_unlock(&spdifrx->lock);
395}
396
397static int stm32_spdifrx_dma_ctrl_register(struct device *dev,
398 struct stm32_spdifrx_data *spdifrx)
399{
400 int ret;
401
402 spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl");
403 if (IS_ERR(spdifrx->ctrl_chan)) {
404 dev_err(dev, "dma_request_slave_channel failed\n");
405 return PTR_ERR(spdifrx->ctrl_chan);
406 }
407
408 spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer),
409 GFP_KERNEL);
410 if (!spdifrx->dmab)
411 return -ENOMEM;
412
413 spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM;
414 spdifrx->dmab->dev.dev = dev;
415 ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev,
416 SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab);
417 if (ret < 0) {
418 dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret);
419 return ret;
420 }
421
422 spdifrx->slave_config.direction = DMA_DEV_TO_MEM;
423 spdifrx->slave_config.src_addr = (dma_addr_t)(spdifrx->phys_addr +
424 STM32_SPDIFRX_CSR);
425 spdifrx->slave_config.dst_addr = spdifrx->dmab->addr;
426 spdifrx->slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
427 spdifrx->slave_config.src_maxburst = 1;
428
429 ret = dmaengine_slave_config(spdifrx->ctrl_chan,
430 &spdifrx->slave_config);
431 if (ret < 0) {
432 dev_err(dev, "dmaengine_slave_config returned error %d\n", ret);
433 spdifrx->ctrl_chan = NULL;
434 }
435
436 return ret;
437};
438
439static const char * const spdifrx_enum_input[] = {
440 "in0", "in1", "in2", "in3"
441};
442
443/* By default CS bits are retrieved from channel A */
444static const char * const spdifrx_enum_cs_channel[] = {
445 "A", "B"
446};
447
448static SOC_ENUM_SINGLE_DECL(ctrl_enum_input,
449 STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT,
450 spdifrx_enum_input);
451
452static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel,
453 STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT,
454 spdifrx_enum_cs_channel);
455
456static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol,
457 struct snd_ctl_elem_info *uinfo)
458{
459 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
460 uinfo->count = 1;
461
462 return 0;
463}
464
465static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol,
466 struct snd_ctl_elem_info *uinfo)
467{
468 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
469 uinfo->count = 1;
470
471 return 0;
472}
473
474static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
475{
476 int ret = 0;
477
478 memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
479 memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
480
481 pinctrl_pm_select_default_state(&spdifrx->pdev->dev);
482
483 ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
484 if (ret < 0)
485 return ret;
486
487 ret = clk_prepare_enable(spdifrx->kclk);
488 if (ret) {
489 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
490 return ret;
491 }
492
493 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
494 SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN);
495 if (ret < 0)
496 goto end;
497
498 ret = stm32_spdifrx_start_sync(spdifrx);
499 if (ret < 0)
500 goto end;
501
502 if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion,
503 msecs_to_jiffies(100))
504 <= 0) {
505 dev_dbg(&spdifrx->pdev->dev, "Failed to get control data\n");
506 ret = -EAGAIN;
507 }
508
509 stm32_spdifrx_stop(spdifrx);
510 stm32_spdifrx_dma_ctrl_stop(spdifrx);
511
512end:
513 clk_disable_unprepare(spdifrx->kclk);
514 pinctrl_pm_select_sleep_state(&spdifrx->pdev->dev);
515
516 return ret;
517}
518
519static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol,
520 struct snd_ctl_elem_value *ucontrol)
521{
522 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
523 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
524
525 stm32_spdifrx_get_ctrl_data(spdifrx);
526
527 ucontrol->value.iec958.status[0] = spdifrx->cs[0];
528 ucontrol->value.iec958.status[1] = spdifrx->cs[1];
529 ucontrol->value.iec958.status[2] = spdifrx->cs[2];
530 ucontrol->value.iec958.status[3] = spdifrx->cs[3];
531 ucontrol->value.iec958.status[4] = spdifrx->cs[4];
532
533 return 0;
534}
535
536static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol,
537 struct snd_ctl_elem_value *ucontrol)
538{
539 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
540 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
541
542 stm32_spdifrx_get_ctrl_data(spdifrx);
543
544 ucontrol->value.iec958.status[0] = spdifrx->ub[0];
545 ucontrol->value.iec958.status[1] = spdifrx->ub[1];
546 ucontrol->value.iec958.status[2] = spdifrx->ub[2];
547 ucontrol->value.iec958.status[3] = spdifrx->ub[3];
548 ucontrol->value.iec958.status[4] = spdifrx->ub[4];
549
550 return 0;
551}
552
553static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = {
554 /* Channel status control */
555 {
556 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
557 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
558 .access = SNDRV_CTL_ELEM_ACCESS_READ |
559 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
560 .info = stm32_spdifrx_info,
561 .get = stm32_spdifrx_capture_get,
562 },
563 /* User bits control */
564 {
565 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
566 .name = "IEC958 User Bit Capture Default",
567 .access = SNDRV_CTL_ELEM_ACCESS_READ |
568 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
569 .info = stm32_spdifrx_ub_info,
570 .get = stm32_spdif_user_bits_get,
571 },
572};
573
574static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = {
575 SOC_ENUM("SPDIFRX input", ctrl_enum_input),
576 SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel),
577};
578
579static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai)
580{
581 int ret;
582
583 ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls,
584 ARRAY_SIZE(stm32_spdifrx_iec_ctrls));
585 if (ret < 0)
586 return ret;
587
588 return snd_soc_add_component_controls(cpu_dai->component,
589 stm32_spdifrx_ctrls,
590 ARRAY_SIZE(stm32_spdifrx_ctrls));
591}
592
593static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai)
594{
595 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev);
596
597 spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr +
598 STM32_SPDIFRX_DR);
599 spdifrx->dma_params.maxburst = 1;
600
601 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
602
603 return stm32_spdifrx_dai_register_ctrls(cpu_dai);
604}
605
606static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg)
607{
608 switch (reg) {
609 case STM32_SPDIFRX_CR:
610 case STM32_SPDIFRX_IMR:
611 case STM32_SPDIFRX_SR:
612 case STM32_SPDIFRX_IFCR:
613 case STM32_SPDIFRX_DR:
614 case STM32_SPDIFRX_CSR:
615 case STM32_SPDIFRX_DIR:
616 case STM32_SPDIFRX_VERR:
617 case STM32_SPDIFRX_IDR:
618 case STM32_SPDIFRX_SIDR:
619 return true;
620 default:
621 return false;
622 }
623}
624
625static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
626{
627 switch (reg) {
628 case STM32_SPDIFRX_DR:
629 case STM32_SPDIFRX_CSR:
630 case STM32_SPDIFRX_SR:
631 case STM32_SPDIFRX_DIR:
632 return true;
633 default:
634 return false;
635 }
636}
637
638static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
639{
640 switch (reg) {
641 case STM32_SPDIFRX_CR:
642 case STM32_SPDIFRX_IMR:
643 case STM32_SPDIFRX_IFCR:
644 return true;
645 default:
646 return false;
647 }
648}
649
650static const struct regmap_config stm32_h7_spdifrx_regmap_conf = {
651 .reg_bits = 32,
652 .reg_stride = 4,
653 .val_bits = 32,
654 .max_register = STM32_SPDIFRX_SIDR,
655 .readable_reg = stm32_spdifrx_readable_reg,
656 .volatile_reg = stm32_spdifrx_volatile_reg,
657 .writeable_reg = stm32_spdifrx_writeable_reg,
658 .num_reg_defaults_raw = STM32_SPDIFRX_SIDR / sizeof(u32) + 1,
659 .fast_io = true,
660 .cache_type = REGCACHE_FLAT,
661};
662
663static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
664{
665 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid;
666 struct snd_pcm_substream *substream = spdifrx->substream;
667 struct platform_device *pdev = spdifrx->pdev;
668 unsigned int cr, mask, sr, imr;
669 unsigned int flags;
670 int err = 0, err_xrun = 0;
671
672 regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr);
673 regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr);
674
675 mask = imr & SPDIFRX_XIMR_MASK;
676 /* SERR, TERR, FERR IRQs are generated if IFEIE is set */
677 if (mask & SPDIFRX_IMR_IFEIE)
678 mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2);
679
680 flags = sr & mask;
681 if (!flags) {
682 dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n",
683 sr, imr);
684 return IRQ_NONE;
685 }
686
687 /* Clear IRQs */
688 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
689 SPDIFRX_XIFCR_MASK, flags);
690
691 if (flags & SPDIFRX_SR_PERR) {
692 dev_dbg(&pdev->dev, "Parity error\n");
693 err_xrun = 1;
694 }
695
696 if (flags & SPDIFRX_SR_OVR) {
697 dev_dbg(&pdev->dev, "Overrun error\n");
698 err_xrun = 1;
699 }
700
701 if (flags & SPDIFRX_SR_SBD)
702 dev_dbg(&pdev->dev, "Synchronization block detected\n");
703
704 if (flags & SPDIFRX_SR_SYNCD) {
705 dev_dbg(&pdev->dev, "Synchronization done\n");
706
707 /* Enable spdifrx */
708 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE);
709 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
710 SPDIFRX_CR_SPDIFEN_MASK, cr);
711 }
712
713 if (flags & SPDIFRX_SR_FERR) {
714 dev_dbg(&pdev->dev, "Frame error\n");
715 err = 1;
716 }
717
718 if (flags & SPDIFRX_SR_SERR) {
719 dev_dbg(&pdev->dev, "Synchronization error\n");
720 err = 1;
721 }
722
723 if (flags & SPDIFRX_SR_TERR) {
724 dev_dbg(&pdev->dev, "Timeout error\n");
725 err = 1;
726 }
727
728 if (err) {
729 /* SPDIFRX in STATE_STOP. Disable SPDIFRX to clear errors */
730 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
731 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
732 SPDIFRX_CR_SPDIFEN_MASK, cr);
733
734 if (substream)
735 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
736
737 return IRQ_HANDLED;
738 }
739
740 if (err_xrun && substream)
741 snd_pcm_stop_xrun(substream);
742
743 return IRQ_HANDLED;
744}
745
746static int stm32_spdifrx_startup(struct snd_pcm_substream *substream,
747 struct snd_soc_dai *cpu_dai)
748{
749 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
750 int ret;
751
752 spdifrx->substream = substream;
753
754 ret = clk_prepare_enable(spdifrx->kclk);
755 if (ret)
756 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
757
758 return ret;
759}
760
761static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream,
762 struct snd_pcm_hw_params *params,
763 struct snd_soc_dai *cpu_dai)
764{
765 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
766 int data_size = params_width(params);
767 int fmt;
768
769 switch (data_size) {
770 case 16:
771 fmt = SPDIFRX_DRFMT_PACKED;
772 break;
773 case 32:
774 fmt = SPDIFRX_DRFMT_LEFT;
775 break;
776 default:
777 dev_err(&spdifrx->pdev->dev, "Unexpected data format\n");
778 return -EINVAL;
779 }
780
781 /*
782 * Set buswidth to 4 bytes for all data formats.
783 * Packed format: transfer 2 x 2 bytes samples
784 * Left format: transfer 1 x 3 bytes samples + 1 dummy byte
785 */
786 spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
787 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
788
789 return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
790 SPDIFRX_CR_DRFMT_MASK,
791 SPDIFRX_CR_DRFMTSET(fmt));
792}
793
794static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd,
795 struct snd_soc_dai *cpu_dai)
796{
797 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
798 int ret = 0;
799
800 switch (cmd) {
801 case SNDRV_PCM_TRIGGER_START:
802 case SNDRV_PCM_TRIGGER_RESUME:
803 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
804 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
805 SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE);
806
807 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
808 SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN);
809
810 ret = stm32_spdifrx_start_sync(spdifrx);
811 break;
812 case SNDRV_PCM_TRIGGER_SUSPEND:
813 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
814 case SNDRV_PCM_TRIGGER_STOP:
815 stm32_spdifrx_stop(spdifrx);
816 break;
817 default:
818 return -EINVAL;
819 }
820
821 return ret;
822}
823
824static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream,
825 struct snd_soc_dai *cpu_dai)
826{
827 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
828
829 spdifrx->substream = NULL;
830 clk_disable_unprepare(spdifrx->kclk);
831}
832
833static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = {
834 .startup = stm32_spdifrx_startup,
835 .hw_params = stm32_spdifrx_hw_params,
836 .trigger = stm32_spdifrx_trigger,
837 .shutdown = stm32_spdifrx_shutdown,
838};
839
840static struct snd_soc_dai_driver stm32_spdifrx_dai[] = {
841 {
842 .probe = stm32_spdifrx_dai_probe,
843 .capture = {
844 .stream_name = "CPU-Capture",
845 .channels_min = 1,
846 .channels_max = 2,
847 .rates = SNDRV_PCM_RATE_8000_192000,
848 .formats = SNDRV_PCM_FMTBIT_S32_LE |
849 SNDRV_PCM_FMTBIT_S16_LE,
850 },
851 .ops = &stm32_spdifrx_pcm_dai_ops,
852 }
853};
854
855static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = {
856 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
857 .buffer_bytes_max = 8 * PAGE_SIZE,
858 .period_bytes_min = 1024,
859 .period_bytes_max = 4 * PAGE_SIZE,
860 .periods_min = 2,
861 .periods_max = 8,
862};
863
864static const struct snd_soc_component_driver stm32_spdifrx_component = {
865 .name = "stm32-spdifrx",
866};
867
868static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = {
869 .pcm_hardware = &stm32_spdifrx_pcm_hw,
870 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
871};
872
873static const struct of_device_id stm32_spdifrx_ids[] = {
874 {
875 .compatible = "st,stm32h7-spdifrx",
876 .data = &stm32_h7_spdifrx_regmap_conf
877 },
878 {}
879};
880
881static int stm32_spdifrx_parse_of(struct platform_device *pdev,
882 struct stm32_spdifrx_data *spdifrx)
883{
884 struct device_node *np = pdev->dev.of_node;
885 const struct of_device_id *of_id;
886 struct resource *res;
887
888 if (!np)
889 return -ENODEV;
890
891 of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev);
892 if (of_id)
893 spdifrx->regmap_conf =
894 (const struct regmap_config *)of_id->data;
895 else
896 return -EINVAL;
897
898 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
899 spdifrx->base = devm_ioremap_resource(&pdev->dev, res);
900 if (IS_ERR(spdifrx->base))
901 return PTR_ERR(spdifrx->base);
902
903 spdifrx->phys_addr = res->start;
904
905 spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk");
906 if (IS_ERR(spdifrx->kclk)) {
907 dev_err(&pdev->dev, "Could not get kclk\n");
908 return PTR_ERR(spdifrx->kclk);
909 }
910
911 spdifrx->irq = platform_get_irq(pdev, 0);
912 if (spdifrx->irq < 0)
913 return spdifrx->irq;
914
915 return 0;
916}
917
918static int stm32_spdifrx_probe(struct platform_device *pdev)
919{
920 struct stm32_spdifrx_data *spdifrx;
921 struct reset_control *rst;
922 const struct snd_dmaengine_pcm_config *pcm_config = NULL;
923 u32 ver, idr;
924 int ret;
925
926 spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL);
927 if (!spdifrx)
928 return -ENOMEM;
929
930 spdifrx->pdev = pdev;
931 init_completion(&spdifrx->cs_completion);
932 spin_lock_init(&spdifrx->lock);
933
934 platform_set_drvdata(pdev, spdifrx);
935
936 ret = stm32_spdifrx_parse_of(pdev, spdifrx);
937 if (ret)
938 return ret;
939
940 spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk",
941 spdifrx->base,
942 spdifrx->regmap_conf);
943 if (IS_ERR(spdifrx->regmap)) {
944 dev_err(&pdev->dev, "Regmap init failed\n");
945 return PTR_ERR(spdifrx->regmap);
946 }
947
948 ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0,
949 dev_name(&pdev->dev), spdifrx);
950 if (ret) {
951 dev_err(&pdev->dev, "IRQ request returned %d\n", ret);
952 return ret;
953 }
954
955 rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
956 if (!IS_ERR(rst)) {
957 reset_control_assert(rst);
958 udelay(2);
959 reset_control_deassert(rst);
960 }
961
962 ret = devm_snd_soc_register_component(&pdev->dev,
963 &stm32_spdifrx_component,
964 stm32_spdifrx_dai,
965 ARRAY_SIZE(stm32_spdifrx_dai));
966 if (ret)
967 return ret;
968
969 ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx);
970 if (ret)
971 goto error;
972
973 pcm_config = &stm32_spdifrx_pcm_config;
974 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0);
975 if (ret) {
976 dev_err(&pdev->dev, "PCM DMA register returned %d\n", ret);
977 goto error;
978 }
979
980 ret = regmap_read(spdifrx->regmap, STM32_SPDIFRX_IDR, &idr);
981 if (ret)
982 goto error;
983
984 if (idr == SPDIFRX_IPIDR_NUMBER) {
985 ret = regmap_read(spdifrx->regmap, STM32_SPDIFRX_VERR, &ver);
986
987 dev_dbg(&pdev->dev, "SPDIFRX version: %lu.%lu registered\n",
988 FIELD_GET(SPDIFRX_VERR_MAJ_MASK, ver),
989 FIELD_GET(SPDIFRX_VERR_MIN_MASK, ver));
990 }
991
992 return ret;
993
994error:
995 if (!IS_ERR(spdifrx->ctrl_chan))
996 dma_release_channel(spdifrx->ctrl_chan);
997 if (spdifrx->dmab)
998 snd_dma_free_pages(spdifrx->dmab);
999
1000 return ret;
1001}
1002
1003static int stm32_spdifrx_remove(struct platform_device *pdev)
1004{
1005 struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev);
1006
1007 if (spdifrx->ctrl_chan)
1008 dma_release_channel(spdifrx->ctrl_chan);
1009
1010 if (spdifrx->dmab)
1011 snd_dma_free_pages(spdifrx->dmab);
1012
1013 return 0;
1014}
1015
1016MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids);
1017
1018#ifdef CONFIG_PM_SLEEP
1019static int stm32_spdifrx_suspend(struct device *dev)
1020{
1021 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev);
1022
1023 regcache_cache_only(spdifrx->regmap, true);
1024 regcache_mark_dirty(spdifrx->regmap);
1025
1026 return 0;
1027}
1028
1029static int stm32_spdifrx_resume(struct device *dev)
1030{
1031 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(dev);
1032
1033 regcache_cache_only(spdifrx->regmap, false);
1034
1035 return regcache_sync(spdifrx->regmap);
1036}
1037#endif /* CONFIG_PM_SLEEP */
1038
1039static const struct dev_pm_ops stm32_spdifrx_pm_ops = {
1040 SET_SYSTEM_SLEEP_PM_OPS(stm32_spdifrx_suspend, stm32_spdifrx_resume)
1041};
1042
1043static struct platform_driver stm32_spdifrx_driver = {
1044 .driver = {
1045 .name = "st,stm32-spdifrx",
1046 .of_match_table = stm32_spdifrx_ids,
1047 .pm = &stm32_spdifrx_pm_ops,
1048 },
1049 .probe = stm32_spdifrx_probe,
1050 .remove = stm32_spdifrx_remove,
1051};
1052
1053module_platform_driver(stm32_spdifrx_driver);
1054
1055MODULE_DESCRIPTION("STM32 Soc spdifrx Interface");
1056MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>");
1057MODULE_ALIAS("platform:stm32-spdifrx");
1058MODULE_LICENSE("GPL v2");