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9#include <linux/bitfield.h>
10#include <linux/clk.h>
11#include <linux/delay.h>
12#include <linux/module.h>
13#include <linux/of_irq.h>
14#include <linux/of_platform.h>
15#include <linux/regmap.h>
16#include <linux/reset.h>
17#include <linux/spinlock.h>
18
19#include <sound/dmaengine_pcm.h>
20#include <sound/pcm_params.h>
21
22#define STM32_I2S_CR1_REG 0x0
23#define STM32_I2S_CFG1_REG 0x08
24#define STM32_I2S_CFG2_REG 0x0C
25#define STM32_I2S_IER_REG 0x10
26#define STM32_I2S_SR_REG 0x14
27#define STM32_I2S_IFCR_REG 0x18
28#define STM32_I2S_TXDR_REG 0X20
29#define STM32_I2S_RXDR_REG 0x30
30#define STM32_I2S_CGFR_REG 0X50
31#define STM32_I2S_HWCFGR_REG 0x3F0
32#define STM32_I2S_VERR_REG 0x3F4
33#define STM32_I2S_IPIDR_REG 0x3F8
34#define STM32_I2S_SIDR_REG 0x3FC
35
36
37#define I2S_CR1_SPE BIT(0)
38#define I2S_CR1_CSTART BIT(9)
39#define I2S_CR1_CSUSP BIT(10)
40#define I2S_CR1_HDDIR BIT(11)
41#define I2S_CR1_SSI BIT(12)
42#define I2S_CR1_CRC33_17 BIT(13)
43#define I2S_CR1_RCRCI BIT(14)
44#define I2S_CR1_TCRCI BIT(15)
45
46
47#define I2S_CFG2_IOSWP_SHIFT 15
48#define I2S_CFG2_IOSWP BIT(I2S_CFG2_IOSWP_SHIFT)
49#define I2S_CFG2_LSBFRST BIT(23)
50#define I2S_CFG2_AFCNTR BIT(31)
51
52
53#define I2S_CFG1_FTHVL_SHIFT 5
54#define I2S_CFG1_FTHVL_MASK GENMASK(8, I2S_CFG1_FTHVL_SHIFT)
55#define I2S_CFG1_FTHVL_SET(x) ((x) << I2S_CFG1_FTHVL_SHIFT)
56
57#define I2S_CFG1_TXDMAEN BIT(15)
58#define I2S_CFG1_RXDMAEN BIT(14)
59
60
61#define I2S_IER_RXPIE BIT(0)
62#define I2S_IER_TXPIE BIT(1)
63#define I2S_IER_DPXPIE BIT(2)
64#define I2S_IER_EOTIE BIT(3)
65#define I2S_IER_TXTFIE BIT(4)
66#define I2S_IER_UDRIE BIT(5)
67#define I2S_IER_OVRIE BIT(6)
68#define I2S_IER_CRCEIE BIT(7)
69#define I2S_IER_TIFREIE BIT(8)
70#define I2S_IER_MODFIE BIT(9)
71#define I2S_IER_TSERFIE BIT(10)
72
73
74#define I2S_SR_RXP BIT(0)
75#define I2S_SR_TXP BIT(1)
76#define I2S_SR_DPXP BIT(2)
77#define I2S_SR_EOT BIT(3)
78#define I2S_SR_TXTF BIT(4)
79#define I2S_SR_UDR BIT(5)
80#define I2S_SR_OVR BIT(6)
81#define I2S_SR_CRCERR BIT(7)
82#define I2S_SR_TIFRE BIT(8)
83#define I2S_SR_MODF BIT(9)
84#define I2S_SR_TSERF BIT(10)
85#define I2S_SR_SUSP BIT(11)
86#define I2S_SR_TXC BIT(12)
87#define I2S_SR_RXPLVL GENMASK(14, 13)
88#define I2S_SR_RXWNE BIT(15)
89
90#define I2S_SR_MASK GENMASK(15, 0)
91
92
93#define I2S_IFCR_EOTC BIT(3)
94#define I2S_IFCR_TXTFC BIT(4)
95#define I2S_IFCR_UDRC BIT(5)
96#define I2S_IFCR_OVRC BIT(6)
97#define I2S_IFCR_CRCEC BIT(7)
98#define I2S_IFCR_TIFREC BIT(8)
99#define I2S_IFCR_MODFC BIT(9)
100#define I2S_IFCR_TSERFC BIT(10)
101#define I2S_IFCR_SUSPC BIT(11)
102
103#define I2S_IFCR_MASK GENMASK(11, 3)
104
105
106#define I2S_CGFR_I2SMOD BIT(0)
107
108#define I2S_CGFR_I2SCFG_SHIFT 1
109#define I2S_CGFR_I2SCFG_MASK GENMASK(3, I2S_CGFR_I2SCFG_SHIFT)
110#define I2S_CGFR_I2SCFG_SET(x) ((x) << I2S_CGFR_I2SCFG_SHIFT)
111
112#define I2S_CGFR_I2SSTD_SHIFT 4
113#define I2S_CGFR_I2SSTD_MASK GENMASK(5, I2S_CGFR_I2SSTD_SHIFT)
114#define I2S_CGFR_I2SSTD_SET(x) ((x) << I2S_CGFR_I2SSTD_SHIFT)
115
116#define I2S_CGFR_PCMSYNC BIT(7)
117
118#define I2S_CGFR_DATLEN_SHIFT 8
119#define I2S_CGFR_DATLEN_MASK GENMASK(9, I2S_CGFR_DATLEN_SHIFT)
120#define I2S_CGFR_DATLEN_SET(x) ((x) << I2S_CGFR_DATLEN_SHIFT)
121
122#define I2S_CGFR_CHLEN_SHIFT 10
123#define I2S_CGFR_CHLEN BIT(I2S_CGFR_CHLEN_SHIFT)
124#define I2S_CGFR_CKPOL BIT(11)
125#define I2S_CGFR_FIXCH BIT(12)
126#define I2S_CGFR_WSINV BIT(13)
127#define I2S_CGFR_DATFMT BIT(14)
128
129#define I2S_CGFR_I2SDIV_SHIFT 16
130#define I2S_CGFR_I2SDIV_BIT_H 23
131#define I2S_CGFR_I2SDIV_MASK GENMASK(I2S_CGFR_I2SDIV_BIT_H,\
132 I2S_CGFR_I2SDIV_SHIFT)
133#define I2S_CGFR_I2SDIV_SET(x) ((x) << I2S_CGFR_I2SDIV_SHIFT)
134#define I2S_CGFR_I2SDIV_MAX ((1 << (I2S_CGFR_I2SDIV_BIT_H -\
135 I2S_CGFR_I2SDIV_SHIFT)) - 1)
136
137#define I2S_CGFR_ODD_SHIFT 24
138#define I2S_CGFR_ODD BIT(I2S_CGFR_ODD_SHIFT)
139#define I2S_CGFR_MCKOE BIT(25)
140
141
142
143
144#define I2S_HWCFGR_I2S_SUPPORT_MASK GENMASK(15, 12)
145
146
147#define I2S_VERR_MIN_MASK GENMASK(3, 0)
148#define I2S_VERR_MAJ_MASK GENMASK(7, 4)
149
150
151#define I2S_IPIDR_ID_MASK GENMASK(31, 0)
152
153
154#define I2S_SIDR_ID_MASK GENMASK(31, 0)
155
156#define I2S_IPIDR_NUMBER 0x00130022
157
158enum i2s_master_mode {
159 I2S_MS_NOT_SET,
160 I2S_MS_MASTER,
161 I2S_MS_SLAVE,
162};
163
164enum i2s_mode {
165 I2S_I2SMOD_TX_SLAVE,
166 I2S_I2SMOD_RX_SLAVE,
167 I2S_I2SMOD_TX_MASTER,
168 I2S_I2SMOD_RX_MASTER,
169 I2S_I2SMOD_FD_SLAVE,
170 I2S_I2SMOD_FD_MASTER,
171};
172
173enum i2s_fifo_th {
174 I2S_FIFO_TH_NONE,
175 I2S_FIFO_TH_ONE_QUARTER,
176 I2S_FIFO_TH_HALF,
177 I2S_FIFO_TH_THREE_QUARTER,
178 I2S_FIFO_TH_FULL,
179};
180
181enum i2s_std {
182 I2S_STD_I2S,
183 I2S_STD_LEFT_J,
184 I2S_STD_RIGHT_J,
185 I2S_STD_DSP,
186};
187
188enum i2s_datlen {
189 I2S_I2SMOD_DATLEN_16,
190 I2S_I2SMOD_DATLEN_24,
191 I2S_I2SMOD_DATLEN_32,
192};
193
194#define STM32_I2S_FIFO_SIZE 16
195
196#define STM32_I2S_IS_MASTER(x) ((x)->ms_flg == I2S_MS_MASTER)
197#define STM32_I2S_IS_SLAVE(x) ((x)->ms_flg == I2S_MS_SLAVE)
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221struct stm32_i2s_data {
222 const struct regmap_config *regmap_conf;
223 struct regmap *regmap;
224 struct platform_device *pdev;
225 struct snd_soc_dai_driver *dai_drv;
226 struct snd_dmaengine_dai_dma_data dma_data_tx;
227 struct snd_dmaengine_dai_dma_data dma_data_rx;
228 struct snd_pcm_substream *substream;
229 struct clk *i2sclk;
230 struct clk *pclk;
231 struct clk *x8kclk;
232 struct clk *x11kclk;
233 void __iomem *base;
234 dma_addr_t phys_addr;
235 spinlock_t lock_fd;
236 spinlock_t irq_lock;
237 unsigned int mclk_rate;
238 unsigned int fmt;
239 int refcount;
240 int ms_flg;
241};
242
243static irqreturn_t stm32_i2s_isr(int irq, void *devid)
244{
245 struct stm32_i2s_data *i2s = (struct stm32_i2s_data *)devid;
246 struct platform_device *pdev = i2s->pdev;
247 u32 sr, ier;
248 unsigned long flags;
249 int err = 0;
250
251 regmap_read(i2s->regmap, STM32_I2S_SR_REG, &sr);
252 regmap_read(i2s->regmap, STM32_I2S_IER_REG, &ier);
253
254 flags = sr & ier;
255 if (!flags) {
256 dev_dbg(&pdev->dev, "Spurious IRQ sr=0x%08x, ier=0x%08x\n",
257 sr, ier);
258 return IRQ_NONE;
259 }
260
261 regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
262 I2S_IFCR_MASK, flags);
263
264 if (flags & I2S_SR_OVR) {
265 dev_dbg(&pdev->dev, "Overrun\n");
266 err = 1;
267 }
268
269 if (flags & I2S_SR_UDR) {
270 dev_dbg(&pdev->dev, "Underrun\n");
271 err = 1;
272 }
273
274 if (flags & I2S_SR_TIFRE)
275 dev_dbg(&pdev->dev, "Frame error\n");
276
277 spin_lock(&i2s->irq_lock);
278 if (err && i2s->substream)
279 snd_pcm_stop_xrun(i2s->substream);
280 spin_unlock(&i2s->irq_lock);
281
282 return IRQ_HANDLED;
283}
284
285static bool stm32_i2s_readable_reg(struct device *dev, unsigned int reg)
286{
287 switch (reg) {
288 case STM32_I2S_CR1_REG:
289 case STM32_I2S_CFG1_REG:
290 case STM32_I2S_CFG2_REG:
291 case STM32_I2S_IER_REG:
292 case STM32_I2S_SR_REG:
293 case STM32_I2S_RXDR_REG:
294 case STM32_I2S_CGFR_REG:
295 case STM32_I2S_HWCFGR_REG:
296 case STM32_I2S_VERR_REG:
297 case STM32_I2S_IPIDR_REG:
298 case STM32_I2S_SIDR_REG:
299 return true;
300 default:
301 return false;
302 }
303}
304
305static bool stm32_i2s_volatile_reg(struct device *dev, unsigned int reg)
306{
307 switch (reg) {
308 case STM32_I2S_SR_REG:
309 case STM32_I2S_RXDR_REG:
310 return true;
311 default:
312 return false;
313 }
314}
315
316static bool stm32_i2s_writeable_reg(struct device *dev, unsigned int reg)
317{
318 switch (reg) {
319 case STM32_I2S_CR1_REG:
320 case STM32_I2S_CFG1_REG:
321 case STM32_I2S_CFG2_REG:
322 case STM32_I2S_IER_REG:
323 case STM32_I2S_IFCR_REG:
324 case STM32_I2S_TXDR_REG:
325 case STM32_I2S_CGFR_REG:
326 return true;
327 default:
328 return false;
329 }
330}
331
332static int stm32_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
333{
334 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
335 u32 cgfr;
336 u32 cgfr_mask = I2S_CGFR_I2SSTD_MASK | I2S_CGFR_CKPOL |
337 I2S_CGFR_WSINV | I2S_CGFR_I2SCFG_MASK;
338
339 dev_dbg(cpu_dai->dev, "fmt %x\n", fmt);
340
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344
345 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
346 case SND_SOC_DAIFMT_I2S:
347 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_I2S);
348 break;
349 case SND_SOC_DAIFMT_MSB:
350 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_LEFT_J);
351 break;
352 case SND_SOC_DAIFMT_LSB:
353 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_RIGHT_J);
354 break;
355 case SND_SOC_DAIFMT_DSP_A:
356 cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_DSP);
357 break;
358
359 default:
360 dev_err(cpu_dai->dev, "Unsupported protocol %#x\n",
361 fmt & SND_SOC_DAIFMT_FORMAT_MASK);
362 return -EINVAL;
363 }
364
365
366 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
367 case SND_SOC_DAIFMT_NB_NF:
368 break;
369 case SND_SOC_DAIFMT_IB_NF:
370 cgfr |= I2S_CGFR_CKPOL;
371 break;
372 case SND_SOC_DAIFMT_NB_IF:
373 cgfr |= I2S_CGFR_WSINV;
374 break;
375 case SND_SOC_DAIFMT_IB_IF:
376 cgfr |= I2S_CGFR_CKPOL;
377 cgfr |= I2S_CGFR_WSINV;
378 break;
379 default:
380 dev_err(cpu_dai->dev, "Unsupported strobing %#x\n",
381 fmt & SND_SOC_DAIFMT_INV_MASK);
382 return -EINVAL;
383 }
384
385
386 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
387 case SND_SOC_DAIFMT_CBM_CFM:
388 i2s->ms_flg = I2S_MS_SLAVE;
389 break;
390 case SND_SOC_DAIFMT_CBS_CFS:
391 i2s->ms_flg = I2S_MS_MASTER;
392 break;
393 default:
394 dev_err(cpu_dai->dev, "Unsupported mode %#x\n",
395 fmt & SND_SOC_DAIFMT_MASTER_MASK);
396 return -EINVAL;
397 }
398
399 i2s->fmt = fmt;
400 return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
401 cgfr_mask, cgfr);
402}
403
404static int stm32_i2s_set_sysclk(struct snd_soc_dai *cpu_dai,
405 int clk_id, unsigned int freq, int dir)
406{
407 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
408
409 dev_dbg(cpu_dai->dev, "I2S MCLK frequency is %uHz\n", freq);
410
411 if ((dir == SND_SOC_CLOCK_OUT) && STM32_I2S_IS_MASTER(i2s)) {
412 i2s->mclk_rate = freq;
413
414
415 return regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
416 I2S_CGFR_MCKOE, I2S_CGFR_MCKOE);
417 }
418
419 return 0;
420}
421
422static int stm32_i2s_configure_clock(struct snd_soc_dai *cpu_dai,
423 struct snd_pcm_hw_params *params)
424{
425 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
426 unsigned long i2s_clock_rate;
427 unsigned int tmp, div, real_div, nb_bits, frame_len;
428 unsigned int rate = params_rate(params);
429 int ret;
430 u32 cgfr, cgfr_mask;
431 bool odd;
432
433 if (!(rate % 11025))
434 clk_set_parent(i2s->i2sclk, i2s->x11kclk);
435 else
436 clk_set_parent(i2s->i2sclk, i2s->x8kclk);
437 i2s_clock_rate = clk_get_rate(i2s->i2sclk);
438
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450
451 if (i2s->mclk_rate) {
452 tmp = DIV_ROUND_CLOSEST(i2s_clock_rate, i2s->mclk_rate);
453 } else {
454 frame_len = 32;
455 if ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) ==
456 SND_SOC_DAIFMT_DSP_A)
457 frame_len = 16;
458
459
460 ret = regmap_read(i2s->regmap, STM32_I2S_CGFR_REG, &cgfr);
461 if (ret < 0)
462 return ret;
463
464 nb_bits = frame_len * ((cgfr & I2S_CGFR_CHLEN) + 1);
465 tmp = DIV_ROUND_CLOSEST(i2s_clock_rate, (nb_bits * rate));
466 }
467
468
469 odd = tmp & 0x1;
470
471
472 div = tmp >> 1;
473
474 cgfr = I2S_CGFR_I2SDIV_SET(div) | (odd << I2S_CGFR_ODD_SHIFT);
475 cgfr_mask = I2S_CGFR_I2SDIV_MASK | I2S_CGFR_ODD;
476
477 real_div = ((2 * div) + odd);
478 dev_dbg(cpu_dai->dev, "I2S clk: %ld, SCLK: %d\n",
479 i2s_clock_rate, rate);
480 dev_dbg(cpu_dai->dev, "Divider: 2*%d(div)+%d(odd) = %d\n",
481 div, odd, real_div);
482
483 if (((div == 1) && odd) || (div > I2S_CGFR_I2SDIV_MAX)) {
484 dev_err(cpu_dai->dev, "Wrong divider setting\n");
485 return -EINVAL;
486 }
487
488 if (!div && !odd)
489 dev_warn(cpu_dai->dev, "real divider forced to 1\n");
490
491 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
492 cgfr_mask, cgfr);
493 if (ret < 0)
494 return ret;
495
496
497 return regmap_update_bits(i2s->regmap, STM32_I2S_CFG2_REG,
498 I2S_CFG2_AFCNTR, I2S_CFG2_AFCNTR);
499}
500
501static int stm32_i2s_configure(struct snd_soc_dai *cpu_dai,
502 struct snd_pcm_hw_params *params,
503 struct snd_pcm_substream *substream)
504{
505 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
506 int format = params_width(params);
507 u32 cfgr, cfgr_mask, cfg1;
508 unsigned int fthlv;
509 int ret;
510
511 switch (format) {
512 case 16:
513 cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_16);
514 cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN;
515 break;
516 case 32:
517 cfgr = I2S_CGFR_DATLEN_SET(I2S_I2SMOD_DATLEN_32) |
518 I2S_CGFR_CHLEN;
519 cfgr_mask = I2S_CGFR_DATLEN_MASK | I2S_CGFR_CHLEN;
520 break;
521 default:
522 dev_err(cpu_dai->dev, "Unexpected format %d", format);
523 return -EINVAL;
524 }
525
526 if (STM32_I2S_IS_SLAVE(i2s)) {
527 cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_SLAVE);
528
529
530 cfgr |= I2S_CGFR_FIXCH;
531 cfgr_mask |= I2S_CGFR_FIXCH;
532 } else {
533 cfgr |= I2S_CGFR_I2SCFG_SET(I2S_I2SMOD_FD_MASTER);
534 }
535 cfgr_mask |= I2S_CGFR_I2SCFG_MASK;
536
537 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
538 cfgr_mask, cfgr);
539 if (ret < 0)
540 return ret;
541
542 fthlv = STM32_I2S_FIFO_SIZE * I2S_FIFO_TH_ONE_QUARTER / 4;
543 cfg1 = I2S_CFG1_FTHVL_SET(fthlv - 1);
544
545 return regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
546 I2S_CFG1_FTHVL_MASK, cfg1);
547}
548
549static int stm32_i2s_startup(struct snd_pcm_substream *substream,
550 struct snd_soc_dai *cpu_dai)
551{
552 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
553 unsigned long flags;
554 int ret;
555
556 spin_lock_irqsave(&i2s->irq_lock, flags);
557 i2s->substream = substream;
558 spin_unlock_irqrestore(&i2s->irq_lock, flags);
559
560 if ((i2s->fmt & SND_SOC_DAIFMT_FORMAT_MASK) != SND_SOC_DAIFMT_DSP_A)
561 snd_pcm_hw_constraint_single(substream->runtime,
562 SNDRV_PCM_HW_PARAM_CHANNELS, 2);
563
564 ret = clk_prepare_enable(i2s->i2sclk);
565 if (ret < 0) {
566 dev_err(cpu_dai->dev, "Failed to enable clock: %d\n", ret);
567 return ret;
568 }
569
570 return regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
571 I2S_IFCR_MASK, I2S_IFCR_MASK);
572}
573
574static int stm32_i2s_hw_params(struct snd_pcm_substream *substream,
575 struct snd_pcm_hw_params *params,
576 struct snd_soc_dai *cpu_dai)
577{
578 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
579 int ret;
580
581 ret = stm32_i2s_configure(cpu_dai, params, substream);
582 if (ret < 0) {
583 dev_err(cpu_dai->dev, "Configuration returned error %d\n", ret);
584 return ret;
585 }
586
587 if (STM32_I2S_IS_MASTER(i2s))
588 ret = stm32_i2s_configure_clock(cpu_dai, params);
589
590 return ret;
591}
592
593static int stm32_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
594 struct snd_soc_dai *cpu_dai)
595{
596 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
597 bool playback_flg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
598 u32 cfg1_mask, ier;
599 int ret;
600
601 switch (cmd) {
602 case SNDRV_PCM_TRIGGER_START:
603 case SNDRV_PCM_TRIGGER_RESUME:
604 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
605
606 dev_dbg(cpu_dai->dev, "start I2S %s\n",
607 playback_flg ? "playback" : "capture");
608
609 cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN;
610 regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
611 cfg1_mask, cfg1_mask);
612
613 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG,
614 I2S_CR1_SPE, I2S_CR1_SPE);
615 if (ret < 0) {
616 dev_err(cpu_dai->dev, "Error %d enabling I2S\n", ret);
617 return ret;
618 }
619
620 ret = regmap_write_bits(i2s->regmap, STM32_I2S_CR1_REG,
621 I2S_CR1_CSTART, I2S_CR1_CSTART);
622 if (ret < 0) {
623 dev_err(cpu_dai->dev, "Error %d starting I2S\n", ret);
624 return ret;
625 }
626
627 regmap_write_bits(i2s->regmap, STM32_I2S_IFCR_REG,
628 I2S_IFCR_MASK, I2S_IFCR_MASK);
629
630 spin_lock(&i2s->lock_fd);
631 i2s->refcount++;
632 if (playback_flg) {
633 ier = I2S_IER_UDRIE;
634 } else {
635 ier = I2S_IER_OVRIE;
636
637 if (STM32_I2S_IS_MASTER(i2s) && i2s->refcount == 1)
638
639 regmap_write(i2s->regmap,
640 STM32_I2S_TXDR_REG, 0);
641 }
642 spin_unlock(&i2s->lock_fd);
643
644 if (STM32_I2S_IS_SLAVE(i2s))
645 ier |= I2S_IER_TIFREIE;
646
647 regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG, ier, ier);
648 break;
649 case SNDRV_PCM_TRIGGER_STOP:
650 case SNDRV_PCM_TRIGGER_SUSPEND:
651 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
652 dev_dbg(cpu_dai->dev, "stop I2S %s\n",
653 playback_flg ? "playback" : "capture");
654
655 if (playback_flg)
656 regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG,
657 I2S_IER_UDRIE,
658 (unsigned int)~I2S_IER_UDRIE);
659 else
660 regmap_update_bits(i2s->regmap, STM32_I2S_IER_REG,
661 I2S_IER_OVRIE,
662 (unsigned int)~I2S_IER_OVRIE);
663
664 spin_lock(&i2s->lock_fd);
665 i2s->refcount--;
666 if (i2s->refcount) {
667 spin_unlock(&i2s->lock_fd);
668 break;
669 }
670
671 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CR1_REG,
672 I2S_CR1_SPE, 0);
673 if (ret < 0) {
674 dev_err(cpu_dai->dev, "Error %d disabling I2S\n", ret);
675 spin_unlock(&i2s->lock_fd);
676 return ret;
677 }
678 spin_unlock(&i2s->lock_fd);
679
680 cfg1_mask = I2S_CFG1_RXDMAEN | I2S_CFG1_TXDMAEN;
681 regmap_update_bits(i2s->regmap, STM32_I2S_CFG1_REG,
682 cfg1_mask, 0);
683 break;
684 default:
685 return -EINVAL;
686 }
687
688 return 0;
689}
690
691static void stm32_i2s_shutdown(struct snd_pcm_substream *substream,
692 struct snd_soc_dai *cpu_dai)
693{
694 struct stm32_i2s_data *i2s = snd_soc_dai_get_drvdata(cpu_dai);
695 unsigned long flags;
696
697 regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
698 I2S_CGFR_MCKOE, (unsigned int)~I2S_CGFR_MCKOE);
699
700 clk_disable_unprepare(i2s->i2sclk);
701
702 spin_lock_irqsave(&i2s->irq_lock, flags);
703 i2s->substream = NULL;
704 spin_unlock_irqrestore(&i2s->irq_lock, flags);
705}
706
707static int stm32_i2s_dai_probe(struct snd_soc_dai *cpu_dai)
708{
709 struct stm32_i2s_data *i2s = dev_get_drvdata(cpu_dai->dev);
710 struct snd_dmaengine_dai_dma_data *dma_data_tx = &i2s->dma_data_tx;
711 struct snd_dmaengine_dai_dma_data *dma_data_rx = &i2s->dma_data_rx;
712
713
714 dma_data_tx->addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
715 dma_data_tx->addr = (dma_addr_t)(i2s->phys_addr) + STM32_I2S_TXDR_REG;
716 dma_data_tx->maxburst = 1;
717 dma_data_rx->addr_width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
718 dma_data_rx->addr = (dma_addr_t)(i2s->phys_addr) + STM32_I2S_RXDR_REG;
719 dma_data_rx->maxburst = 1;
720
721 snd_soc_dai_init_dma_data(cpu_dai, dma_data_tx, dma_data_rx);
722
723 return 0;
724}
725
726static const struct regmap_config stm32_h7_i2s_regmap_conf = {
727 .reg_bits = 32,
728 .reg_stride = 4,
729 .val_bits = 32,
730 .max_register = STM32_I2S_SIDR_REG,
731 .readable_reg = stm32_i2s_readable_reg,
732 .volatile_reg = stm32_i2s_volatile_reg,
733 .writeable_reg = stm32_i2s_writeable_reg,
734 .num_reg_defaults_raw = STM32_I2S_SIDR_REG / sizeof(u32) + 1,
735 .fast_io = true,
736 .cache_type = REGCACHE_FLAT,
737};
738
739static const struct snd_soc_dai_ops stm32_i2s_pcm_dai_ops = {
740 .set_sysclk = stm32_i2s_set_sysclk,
741 .set_fmt = stm32_i2s_set_dai_fmt,
742 .startup = stm32_i2s_startup,
743 .hw_params = stm32_i2s_hw_params,
744 .trigger = stm32_i2s_trigger,
745 .shutdown = stm32_i2s_shutdown,
746};
747
748static const struct snd_pcm_hardware stm32_i2s_pcm_hw = {
749 .info = SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP,
750 .buffer_bytes_max = 8 * PAGE_SIZE,
751 .period_bytes_min = 1024,
752 .period_bytes_max = 4 * PAGE_SIZE,
753 .periods_min = 2,
754 .periods_max = 8,
755};
756
757static const struct snd_dmaengine_pcm_config stm32_i2s_pcm_config = {
758 .pcm_hardware = &stm32_i2s_pcm_hw,
759 .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
760 .prealloc_buffer_size = PAGE_SIZE * 8,
761};
762
763static const struct snd_soc_component_driver stm32_i2s_component = {
764 .name = "stm32-i2s",
765};
766
767static void stm32_i2s_dai_init(struct snd_soc_pcm_stream *stream,
768 char *stream_name)
769{
770 stream->stream_name = stream_name;
771 stream->channels_min = 1;
772 stream->channels_max = 2;
773 stream->rates = SNDRV_PCM_RATE_8000_192000;
774 stream->formats = SNDRV_PCM_FMTBIT_S16_LE |
775 SNDRV_PCM_FMTBIT_S32_LE;
776}
777
778static int stm32_i2s_dais_init(struct platform_device *pdev,
779 struct stm32_i2s_data *i2s)
780{
781 struct snd_soc_dai_driver *dai_ptr;
782
783 dai_ptr = devm_kzalloc(&pdev->dev, sizeof(struct snd_soc_dai_driver),
784 GFP_KERNEL);
785 if (!dai_ptr)
786 return -ENOMEM;
787
788 dai_ptr->probe = stm32_i2s_dai_probe;
789 dai_ptr->ops = &stm32_i2s_pcm_dai_ops;
790 dai_ptr->id = 1;
791 stm32_i2s_dai_init(&dai_ptr->playback, "playback");
792 stm32_i2s_dai_init(&dai_ptr->capture, "capture");
793 i2s->dai_drv = dai_ptr;
794
795 return 0;
796}
797
798static const struct of_device_id stm32_i2s_ids[] = {
799 {
800 .compatible = "st,stm32h7-i2s",
801 .data = &stm32_h7_i2s_regmap_conf
802 },
803 {},
804};
805
806static int stm32_i2s_parse_dt(struct platform_device *pdev,
807 struct stm32_i2s_data *i2s)
808{
809 struct device_node *np = pdev->dev.of_node;
810 const struct of_device_id *of_id;
811 struct reset_control *rst;
812 struct resource *res;
813 int irq, ret;
814
815 if (!np)
816 return -ENODEV;
817
818 of_id = of_match_device(stm32_i2s_ids, &pdev->dev);
819 if (of_id)
820 i2s->regmap_conf = (const struct regmap_config *)of_id->data;
821 else
822 return -EINVAL;
823
824 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
825 i2s->base = devm_ioremap_resource(&pdev->dev, res);
826 if (IS_ERR(i2s->base))
827 return PTR_ERR(i2s->base);
828
829 i2s->phys_addr = res->start;
830
831
832 i2s->pclk = devm_clk_get(&pdev->dev, "pclk");
833 if (IS_ERR(i2s->pclk)) {
834 dev_err(&pdev->dev, "Could not get pclk\n");
835 return PTR_ERR(i2s->pclk);
836 }
837
838 i2s->i2sclk = devm_clk_get(&pdev->dev, "i2sclk");
839 if (IS_ERR(i2s->i2sclk)) {
840 dev_err(&pdev->dev, "Could not get i2sclk\n");
841 return PTR_ERR(i2s->i2sclk);
842 }
843
844 i2s->x8kclk = devm_clk_get(&pdev->dev, "x8k");
845 if (IS_ERR(i2s->x8kclk)) {
846 dev_err(&pdev->dev, "missing x8k parent clock\n");
847 return PTR_ERR(i2s->x8kclk);
848 }
849
850 i2s->x11kclk = devm_clk_get(&pdev->dev, "x11k");
851 if (IS_ERR(i2s->x11kclk)) {
852 dev_err(&pdev->dev, "missing x11k parent clock\n");
853 return PTR_ERR(i2s->x11kclk);
854 }
855
856
857 irq = platform_get_irq(pdev, 0);
858 if (irq < 0) {
859 if (irq != -EPROBE_DEFER)
860 dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);
861 return irq;
862 }
863
864 ret = devm_request_irq(&pdev->dev, irq, stm32_i2s_isr, IRQF_ONESHOT,
865 dev_name(&pdev->dev), i2s);
866 if (ret) {
867 dev_err(&pdev->dev, "irq request returned %d\n", ret);
868 return ret;
869 }
870
871
872 rst = devm_reset_control_get_exclusive(&pdev->dev, NULL);
873 if (!IS_ERR(rst)) {
874 reset_control_assert(rst);
875 udelay(2);
876 reset_control_deassert(rst);
877 }
878
879 return 0;
880}
881
882static int stm32_i2s_probe(struct platform_device *pdev)
883{
884 struct stm32_i2s_data *i2s;
885 u32 val;
886 int ret;
887
888 i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
889 if (!i2s)
890 return -ENOMEM;
891
892 ret = stm32_i2s_parse_dt(pdev, i2s);
893 if (ret)
894 return ret;
895
896 i2s->pdev = pdev;
897 i2s->ms_flg = I2S_MS_NOT_SET;
898 spin_lock_init(&i2s->lock_fd);
899 spin_lock_init(&i2s->irq_lock);
900 platform_set_drvdata(pdev, i2s);
901
902 ret = stm32_i2s_dais_init(pdev, i2s);
903 if (ret)
904 return ret;
905
906 i2s->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "pclk",
907 i2s->base, i2s->regmap_conf);
908 if (IS_ERR(i2s->regmap)) {
909 dev_err(&pdev->dev, "regmap init failed\n");
910 return PTR_ERR(i2s->regmap);
911 }
912
913 ret = devm_snd_soc_register_component(&pdev->dev, &stm32_i2s_component,
914 i2s->dai_drv, 1);
915 if (ret)
916 return ret;
917
918 ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
919 &stm32_i2s_pcm_config, 0);
920 if (ret)
921 return ret;
922
923
924 ret = regmap_update_bits(i2s->regmap, STM32_I2S_CGFR_REG,
925 I2S_CGFR_I2SMOD, I2S_CGFR_I2SMOD);
926 if (ret)
927 return ret;
928
929 ret = regmap_read(i2s->regmap, STM32_I2S_IPIDR_REG, &val);
930 if (ret)
931 return ret;
932
933 if (val == I2S_IPIDR_NUMBER) {
934 ret = regmap_read(i2s->regmap, STM32_I2S_HWCFGR_REG, &val);
935 if (ret)
936 return ret;
937
938 if (!FIELD_GET(I2S_HWCFGR_I2S_SUPPORT_MASK, val)) {
939 dev_err(&pdev->dev,
940 "Device does not support i2s mode\n");
941 return -EPERM;
942 }
943
944 ret = regmap_read(i2s->regmap, STM32_I2S_VERR_REG, &val);
945
946 dev_dbg(&pdev->dev, "I2S version: %lu.%lu registered\n",
947 FIELD_GET(I2S_VERR_MAJ_MASK, val),
948 FIELD_GET(I2S_VERR_MIN_MASK, val));
949 }
950
951 return ret;
952}
953
954MODULE_DEVICE_TABLE(of, stm32_i2s_ids);
955
956#ifdef CONFIG_PM_SLEEP
957static int stm32_i2s_suspend(struct device *dev)
958{
959 struct stm32_i2s_data *i2s = dev_get_drvdata(dev);
960
961 regcache_cache_only(i2s->regmap, true);
962 regcache_mark_dirty(i2s->regmap);
963
964 return 0;
965}
966
967static int stm32_i2s_resume(struct device *dev)
968{
969 struct stm32_i2s_data *i2s = dev_get_drvdata(dev);
970
971 regcache_cache_only(i2s->regmap, false);
972 return regcache_sync(i2s->regmap);
973}
974#endif
975
976static const struct dev_pm_ops stm32_i2s_pm_ops = {
977 SET_SYSTEM_SLEEP_PM_OPS(stm32_i2s_suspend, stm32_i2s_resume)
978};
979
980static struct platform_driver stm32_i2s_driver = {
981 .driver = {
982 .name = "st,stm32-i2s",
983 .of_match_table = stm32_i2s_ids,
984 .pm = &stm32_i2s_pm_ops,
985 },
986 .probe = stm32_i2s_probe,
987};
988
989module_platform_driver(stm32_i2s_driver);
990
991MODULE_DESCRIPTION("STM32 Soc i2s Interface");
992MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>");
993MODULE_ALIAS("platform:stm32-i2s");
994MODULE_LICENSE("GPL v2");
995
