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-rw-r--r--sound/soc/stm/stm32_spdifrx.c998
1 files changed, 998 insertions, 0 deletions
diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c
new file mode 100644
index 000000000000..4e4250bdb75a
--- /dev/null
+++ b/sound/soc/stm/stm32_spdifrx.c
@@ -0,0 +1,998 @@
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 */
221struct 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
242static 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
283static 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
308static void stm32_spdifrx_dma_ctrl_stop(struct stm32_spdifrx_data *spdifrx)
309{
310 dmaengine_terminate_async(spdifrx->ctrl_chan);
311}
312
313static 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
361static 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
390static int stm32_spdifrx_dma_ctrl_register(struct device *dev,
391 struct stm32_spdifrx_data *spdifrx)
392{
393 int ret;
394
395 spdifrx->dmab = devm_kzalloc(dev, sizeof(struct snd_dma_buffer),
396 GFP_KERNEL);
397 if (!spdifrx->dmab)
398 return -ENOMEM;
399
400 spdifrx->dmab->dev.type = SNDRV_DMA_TYPE_DEV_IRAM;
401 spdifrx->dmab->dev.dev = dev;
402 ret = snd_dma_alloc_pages(spdifrx->dmab->dev.type, dev,
403 SPDIFRX_CSR_BUF_LENGTH, spdifrx->dmab);
404 if (ret < 0) {
405 dev_err(dev, "snd_dma_alloc_pages returned error %d\n", ret);
406 return ret;
407 }
408
409 spdifrx->ctrl_chan = dma_request_chan(dev, "rx-ctrl");
410 if (!spdifrx->ctrl_chan) {
411 dev_err(dev, "dma_request_slave_channel failed\n");
412 return -EINVAL;
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 dma_release_channel(spdifrx->ctrl_chan);
427 spdifrx->ctrl_chan = NULL;
428 }
429
430 return ret;
431};
432
433static const char * const spdifrx_enum_input[] = {
434 "in0", "in1", "in2", "in3"
435};
436
437/* By default CS bits are retrieved from channel A */
438static const char * const spdifrx_enum_cs_channel[] = {
439 "A", "B"
440};
441
442static SOC_ENUM_SINGLE_DECL(ctrl_enum_input,
443 STM32_SPDIFRX_CR, SPDIFRX_CR_INSEL_SHIFT,
444 spdifrx_enum_input);
445
446static SOC_ENUM_SINGLE_DECL(ctrl_enum_cs_channel,
447 STM32_SPDIFRX_CR, SPDIFRX_CR_CHSEL_SHIFT,
448 spdifrx_enum_cs_channel);
449
450static int stm32_spdifrx_info(struct snd_kcontrol *kcontrol,
451 struct snd_ctl_elem_info *uinfo)
452{
453 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
454 uinfo->count = 1;
455
456 return 0;
457}
458
459static int stm32_spdifrx_ub_info(struct snd_kcontrol *kcontrol,
460 struct snd_ctl_elem_info *uinfo)
461{
462 uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
463 uinfo->count = 1;
464
465 return 0;
466}
467
468static int stm32_spdifrx_get_ctrl_data(struct stm32_spdifrx_data *spdifrx)
469{
470 int ret = 0;
471
472 memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
473 memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
474
475 ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
476 if (ret < 0)
477 return ret;
478
479 ret = clk_prepare_enable(spdifrx->kclk);
480 if (ret) {
481 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
482 return ret;
483 }
484
485 ret = regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
486 SPDIFRX_CR_CBDMAEN, SPDIFRX_CR_CBDMAEN);
487 if (ret < 0)
488 goto end;
489
490 ret = stm32_spdifrx_start_sync(spdifrx);
491 if (ret < 0)
492 goto end;
493
494 if (wait_for_completion_interruptible_timeout(&spdifrx->cs_completion,
495 msecs_to_jiffies(100))
496 <= 0) {
497 dev_err(&spdifrx->pdev->dev, "Failed to get control data\n");
498 ret = -EAGAIN;
499 }
500
501 stm32_spdifrx_stop(spdifrx);
502 stm32_spdifrx_dma_ctrl_stop(spdifrx);
503
504end:
505 clk_disable_unprepare(spdifrx->kclk);
506
507 return ret;
508}
509
510static int stm32_spdifrx_capture_get(struct snd_kcontrol *kcontrol,
511 struct snd_ctl_elem_value *ucontrol)
512{
513 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
514 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
515
516 stm32_spdifrx_get_ctrl_data(spdifrx);
517
518 ucontrol->value.iec958.status[0] = spdifrx->cs[0];
519 ucontrol->value.iec958.status[1] = spdifrx->cs[1];
520 ucontrol->value.iec958.status[2] = spdifrx->cs[2];
521 ucontrol->value.iec958.status[3] = spdifrx->cs[3];
522 ucontrol->value.iec958.status[4] = spdifrx->cs[4];
523
524 return 0;
525}
526
527static int stm32_spdif_user_bits_get(struct snd_kcontrol *kcontrol,
528 struct snd_ctl_elem_value *ucontrol)
529{
530 struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
531 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
532
533 stm32_spdifrx_get_ctrl_data(spdifrx);
534
535 ucontrol->value.iec958.status[0] = spdifrx->ub[0];
536 ucontrol->value.iec958.status[1] = spdifrx->ub[1];
537 ucontrol->value.iec958.status[2] = spdifrx->ub[2];
538 ucontrol->value.iec958.status[3] = spdifrx->ub[3];
539 ucontrol->value.iec958.status[4] = spdifrx->ub[4];
540
541 return 0;
542}
543
544static struct snd_kcontrol_new stm32_spdifrx_iec_ctrls[] = {
545 /* Channel status control */
546 {
547 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
548 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
549 .access = SNDRV_CTL_ELEM_ACCESS_READ |
550 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
551 .info = stm32_spdifrx_info,
552 .get = stm32_spdifrx_capture_get,
553 },
554 /* User bits control */
555 {
556 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
557 .name = "IEC958 User Bit Capture Default",
558 .access = SNDRV_CTL_ELEM_ACCESS_READ |
559 SNDRV_CTL_ELEM_ACCESS_VOLATILE,
560 .info = stm32_spdifrx_ub_info,
561 .get = stm32_spdif_user_bits_get,
562 },
563};
564
565static struct snd_kcontrol_new stm32_spdifrx_ctrls[] = {
566 SOC_ENUM("SPDIFRX input", ctrl_enum_input),
567 SOC_ENUM("SPDIFRX CS channel", ctrl_enum_cs_channel),
568};
569
570static int stm32_spdifrx_dai_register_ctrls(struct snd_soc_dai *cpu_dai)
571{
572 int ret;
573
574 ret = snd_soc_add_dai_controls(cpu_dai, stm32_spdifrx_iec_ctrls,
575 ARRAY_SIZE(stm32_spdifrx_iec_ctrls));
576 if (ret < 0)
577 return ret;
578
579 return snd_soc_add_component_controls(cpu_dai->component,
580 stm32_spdifrx_ctrls,
581 ARRAY_SIZE(stm32_spdifrx_ctrls));
582}
583
584static int stm32_spdifrx_dai_probe(struct snd_soc_dai *cpu_dai)
585{
586 struct stm32_spdifrx_data *spdifrx = dev_get_drvdata(cpu_dai->dev);
587
588 spdifrx->dma_params.addr = (dma_addr_t)(spdifrx->phys_addr +
589 STM32_SPDIFRX_DR);
590 spdifrx->dma_params.maxburst = 1;
591
592 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
593
594 return stm32_spdifrx_dai_register_ctrls(cpu_dai);
595}
596
597static bool stm32_spdifrx_readable_reg(struct device *dev, unsigned int reg)
598{
599 switch (reg) {
600 case STM32_SPDIFRX_CR:
601 case STM32_SPDIFRX_IMR:
602 case STM32_SPDIFRX_SR:
603 case STM32_SPDIFRX_IFCR:
604 case STM32_SPDIFRX_DR:
605 case STM32_SPDIFRX_CSR:
606 case STM32_SPDIFRX_DIR:
607 return true;
608 default:
609 return false;
610 }
611}
612
613static bool stm32_spdifrx_volatile_reg(struct device *dev, unsigned int reg)
614{
615 if (reg == STM32_SPDIFRX_DR)
616 return true;
617
618 return false;
619}
620
621static bool stm32_spdifrx_writeable_reg(struct device *dev, unsigned int reg)
622{
623 switch (reg) {
624 case STM32_SPDIFRX_CR:
625 case STM32_SPDIFRX_IMR:
626 case STM32_SPDIFRX_IFCR:
627 return true;
628 default:
629 return false;
630 }
631}
632
633static const struct regmap_config stm32_h7_spdifrx_regmap_conf = {
634 .reg_bits = 32,
635 .reg_stride = 4,
636 .val_bits = 32,
637 .max_register = STM32_SPDIFRX_DIR,
638 .readable_reg = stm32_spdifrx_readable_reg,
639 .volatile_reg = stm32_spdifrx_volatile_reg,
640 .writeable_reg = stm32_spdifrx_writeable_reg,
641 .fast_io = true,
642};
643
644static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
645{
646 struct stm32_spdifrx_data *spdifrx = (struct stm32_spdifrx_data *)devid;
647 struct snd_pcm_substream *substream = spdifrx->substream;
648 struct platform_device *pdev = spdifrx->pdev;
649 unsigned int cr, mask, sr, imr;
650 unsigned int flags;
651 int err = 0, err_xrun = 0;
652
653 regmap_read(spdifrx->regmap, STM32_SPDIFRX_SR, &sr);
654 regmap_read(spdifrx->regmap, STM32_SPDIFRX_IMR, &imr);
655
656 mask = imr & SPDIFRX_XIMR_MASK;
657 /* SERR, TERR, FERR IRQs are generated if IFEIE is set */
658 if (mask & SPDIFRX_IMR_IFEIE)
659 mask |= (SPDIFRX_IMR_IFEIE << 1) | (SPDIFRX_IMR_IFEIE << 2);
660
661 flags = sr & mask;
662 if (!flags) {
663 dev_err(&pdev->dev, "Unexpected IRQ. rflags=%#x, imr=%#x\n",
664 sr, imr);
665 return IRQ_NONE;
666 }
667
668 /* Clear IRQs */
669 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IFCR,
670 SPDIFRX_XIFCR_MASK, flags);
671
672 if (flags & SPDIFRX_SR_PERR) {
673 dev_dbg(&pdev->dev, "Parity error\n");
674 err_xrun = 1;
675 }
676
677 if (flags & SPDIFRX_SR_OVR) {
678 dev_dbg(&pdev->dev, "Overrun error\n");
679 err_xrun = 1;
680 }
681
682 if (flags & SPDIFRX_SR_SBD)
683 dev_dbg(&pdev->dev, "Synchronization block detected\n");
684
685 if (flags & SPDIFRX_SR_SYNCD) {
686 dev_dbg(&pdev->dev, "Synchronization done\n");
687
688 /* Enable spdifrx */
689 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_ENABLE);
690 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
691 SPDIFRX_CR_SPDIFEN_MASK, cr);
692 }
693
694 if (flags & SPDIFRX_SR_FERR) {
695 dev_dbg(&pdev->dev, "Frame error\n");
696 err = 1;
697 }
698
699 if (flags & SPDIFRX_SR_SERR) {
700 dev_dbg(&pdev->dev, "Synchronization error\n");
701 err = 1;
702 }
703
704 if (flags & SPDIFRX_SR_TERR) {
705 dev_dbg(&pdev->dev, "Timeout error\n");
706 err = 1;
707 }
708
709 if (err) {
710 /* SPDIFRX in STATE_STOP. Disable SPDIFRX to clear errors */
711 cr = SPDIFRX_CR_SPDIFENSET(SPDIFRX_SPDIFEN_DISABLE);
712 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
713 SPDIFRX_CR_SPDIFEN_MASK, cr);
714
715 if (substream)
716 snd_pcm_stop(substream, SNDRV_PCM_STATE_DISCONNECTED);
717
718 return IRQ_HANDLED;
719 }
720
721 if (err_xrun && substream)
722 snd_pcm_stop_xrun(substream);
723
724 return IRQ_HANDLED;
725}
726
727static int stm32_spdifrx_startup(struct snd_pcm_substream *substream,
728 struct snd_soc_dai *cpu_dai)
729{
730 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
731 int ret;
732
733 spdifrx->substream = substream;
734
735 ret = clk_prepare_enable(spdifrx->kclk);
736 if (ret)
737 dev_err(&spdifrx->pdev->dev, "Enable kclk failed: %d\n", ret);
738
739 return ret;
740}
741
742static int stm32_spdifrx_hw_params(struct snd_pcm_substream *substream,
743 struct snd_pcm_hw_params *params,
744 struct snd_soc_dai *cpu_dai)
745{
746 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
747 int data_size = params_width(params);
748 int fmt;
749
750 switch (data_size) {
751 case 16:
752 fmt = SPDIFRX_DRFMT_PACKED;
753 spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
754 break;
755 case 32:
756 fmt = SPDIFRX_DRFMT_LEFT;
757 spdifrx->dma_params.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
758 break;
759 default:
760 dev_err(&spdifrx->pdev->dev, "Unexpected data format\n");
761 return -EINVAL;
762 }
763
764 snd_soc_dai_init_dma_data(cpu_dai, NULL, &spdifrx->dma_params);
765
766 return regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
767 SPDIFRX_CR_DRFMT_MASK,
768 SPDIFRX_CR_DRFMTSET(fmt));
769}
770
771static int stm32_spdifrx_trigger(struct snd_pcm_substream *substream, int cmd,
772 struct snd_soc_dai *cpu_dai)
773{
774 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
775 int ret = 0;
776
777 switch (cmd) {
778 case SNDRV_PCM_TRIGGER_START:
779 case SNDRV_PCM_TRIGGER_RESUME:
780 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
781 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_IMR,
782 SPDIFRX_IMR_OVRIE, SPDIFRX_IMR_OVRIE);
783
784 regmap_update_bits(spdifrx->regmap, STM32_SPDIFRX_CR,
785 SPDIFRX_CR_RXDMAEN, SPDIFRX_CR_RXDMAEN);
786
787 ret = stm32_spdifrx_start_sync(spdifrx);
788 break;
789 case SNDRV_PCM_TRIGGER_SUSPEND:
790 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
791 case SNDRV_PCM_TRIGGER_STOP:
792 stm32_spdifrx_stop(spdifrx);
793 break;
794 default:
795 return -EINVAL;
796 }
797
798 return ret;
799}
800
801static void stm32_spdifrx_shutdown(struct snd_pcm_substream *substream,
802 struct snd_soc_dai *cpu_dai)
803{
804 struct stm32_spdifrx_data *spdifrx = snd_soc_dai_get_drvdata(cpu_dai);
805
806 spdifrx->substream = NULL;
807 clk_disable_unprepare(spdifrx->kclk);
808}
809
810static const struct snd_soc_dai_ops stm32_spdifrx_pcm_dai_ops = {
811 .startup = stm32_spdifrx_startup,
812 .hw_params = stm32_spdifrx_hw_params,
813 .trigger = stm32_spdifrx_trigger,
814 .shutdown = stm32_spdifrx_shutdown,
815};
816
817static struct snd_soc_dai_driver stm32_spdifrx_dai[] = {
818 {
819 .name = "spdifrx-capture-cpu-dai",
820 .probe = stm32_spdifrx_dai_probe,
821 .capture = {
822 .stream_name = "CPU-Capture",
823 .channels_min = 1,
824 .channels_max = 2,
825 .rates = SNDRV_PCM_RATE_8000_192000,
826 .formats = SNDRV_PCM_FMTBIT_S32_LE |
827 SNDRV_PCM_FMTBIT_S16_LE,
828 },
829 .ops = &stm32_spdifrx_pcm_dai_ops,
830 }
831};
832
833static const struct snd_pcm_hardware stm32_spdifrx_pcm_hw = {
834 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
835 .buffer_bytes_max = 8 * PAGE_SIZE,
836 .period_bytes_max = 2048, /* MDMA constraint */
837 .periods_min = 2,
838 .periods_max = 8,
839};
840
841static const struct snd_soc_component_driver stm32_spdifrx_component = {
842 .name = "stm32-spdifrx",
843};
844
845static const struct snd_dmaengine_pcm_config stm32_spdifrx_pcm_config = {
846 .pcm_hardware = &stm32_spdifrx_pcm_hw,
847 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
848};
849
850static const struct of_device_id stm32_spdifrx_ids[] = {
851 {
852 .compatible = "st,stm32h7-spdifrx",
853 .data = &stm32_h7_spdifrx_regmap_conf
854 },
855 {}
856};
857
858static int stm_spdifrx_parse_of(struct platform_device *pdev,
859 struct stm32_spdifrx_data *spdifrx)
860{
861 struct device_node *np = pdev->dev.of_node;
862 const struct of_device_id *of_id;
863 struct resource *res;
864
865 if (!np)
866 return -ENODEV;
867
868 of_id = of_match_device(stm32_spdifrx_ids, &pdev->dev);
869 if (of_id)
870 spdifrx->regmap_conf =
871 (const struct regmap_config *)of_id->data;
872 else
873 return -EINVAL;
874
875 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
876 spdifrx->base = devm_ioremap_resource(&pdev->dev, res);
877 if (IS_ERR(spdifrx->base))
878 return PTR_ERR(spdifrx->base);
879
880 spdifrx->phys_addr = res->start;
881
882 spdifrx->kclk = devm_clk_get(&pdev->dev, "kclk");
883 if (IS_ERR(spdifrx->kclk)) {
884 dev_err(&pdev->dev, "Could not get kclk\n");
885 return PTR_ERR(spdifrx->kclk);
886 }
887
888 spdifrx->irq = platform_get_irq(pdev, 0);
889 if (spdifrx->irq < 0) {
890 dev_err(&pdev->dev, "No irq for node %s\n", pdev->name);
891 return spdifrx->irq;
892 }
893
894 return 0;
895}
896
897static int stm32_spdifrx_probe(struct platform_device *pdev)
898{
899 struct stm32_spdifrx_data *spdifrx;
900 struct reset_control *rst;
901 const struct snd_dmaengine_pcm_config *pcm_config = NULL;
902 int ret;
903
904 spdifrx = devm_kzalloc(&pdev->dev, sizeof(*spdifrx), GFP_KERNEL);
905 if (!spdifrx)
906 return -ENOMEM;
907
908 spdifrx->pdev = pdev;
909 init_completion(&spdifrx->cs_completion);
910 spin_lock_init(&spdifrx->lock);
911
912 platform_set_drvdata(pdev, spdifrx);
913
914 ret = stm_spdifrx_parse_of(pdev, spdifrx);
915 if (ret)
916 return ret;
917
918 spdifrx->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "kclk",
919 spdifrx->base,
920 spdifrx->regmap_conf);
921 if (IS_ERR(spdifrx->regmap)) {
922 dev_err(&pdev->dev, "Regmap init failed\n");
923 return PTR_ERR(spdifrx->regmap);
924 }
925
926 ret = devm_request_irq(&pdev->dev, spdifrx->irq, stm32_spdifrx_isr, 0,
927 dev_name(&pdev->dev), spdifrx);
928 if (ret) {
929 dev_err(&pdev->dev, "IRQ request returned %d\n", ret);
930 return ret;
931 }
932
933 rst = devm_reset_control_get(&pdev->dev, NULL);
934 if (!IS_ERR(rst)) {
935 reset_control_assert(rst);
936 udelay(2);
937 reset_control_deassert(rst);
938 }
939
940 ret = devm_snd_soc_register_component(&pdev->dev,
941 &stm32_spdifrx_component,
942 stm32_spdifrx_dai,
943 ARRAY_SIZE(stm32_spdifrx_dai));
944 if (ret)
945 return ret;
946
947 ret = stm32_spdifrx_dma_ctrl_register(&pdev->dev, spdifrx);
948 if (ret)
949 goto error;
950
951 pcm_config = &stm32_spdifrx_pcm_config;
952 ret = devm_snd_dmaengine_pcm_register(&pdev->dev, pcm_config, 0);
953 if (ret) {
954 dev_err(&pdev->dev, "PCM DMA register returned %d\n", ret);
955 goto error;
956 }
957
958 return 0;
959
960error:
961 if (spdifrx->ctrl_chan)
962 dma_release_channel(spdifrx->ctrl_chan);
963 if (spdifrx->dmab)
964 snd_dma_free_pages(spdifrx->dmab);
965
966 return ret;
967}
968
969static int stm32_spdifrx_remove(struct platform_device *pdev)
970{
971 struct stm32_spdifrx_data *spdifrx = platform_get_drvdata(pdev);
972
973 if (spdifrx->ctrl_chan)
974 dma_release_channel(spdifrx->ctrl_chan);
975
976 if (spdifrx->dmab)
977 snd_dma_free_pages(spdifrx->dmab);
978
979 return 0;
980}
981
982MODULE_DEVICE_TABLE(of, stm32_spdifrx_ids);
983
984static struct platform_driver stm32_spdifrx_driver = {
985 .driver = {
986 .name = "st,stm32-spdifrx",
987 .of_match_table = stm32_spdifrx_ids,
988 },
989 .probe = stm32_spdifrx_probe,
990 .remove = stm32_spdifrx_remove,
991};
992
993module_platform_driver(stm32_spdifrx_driver);
994
995MODULE_DESCRIPTION("STM32 Soc spdifrx Interface");
996MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>");
997MODULE_ALIAS("platform:stm32-spdifrx");
998MODULE_LICENSE("GPL v2");
generated by cgit v1.2.2 (git 2.25.0) at 2025-04-25 20:02:20 -0400