1 // SPDX-License-Identifier: GPL-2.0
3 // Driver for Microchip I2S Multi-channel controller
5 // Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries
7 // Author: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/device.h>
12 #include <linux/slab.h>
14 #include <linux/delay.h>
16 #include <linux/clk.h>
17 #include <linux/mfd/syscon.h>
18 #include <linux/lcm.h>
20 #include <sound/core.h>
21 #include <sound/pcm.h>
22 #include <sound/pcm_params.h>
23 #include <sound/initval.h>
24 #include <sound/soc.h>
25 #include <sound/dmaengine_pcm.h>
28 * ---- I2S Controller Register map ----
30 #define MCHP_I2SMCC_CR 0x0000 /* Control Register */
31 #define MCHP_I2SMCC_MRA 0x0004 /* Mode Register A */
32 #define MCHP_I2SMCC_MRB 0x0008 /* Mode Register B */
33 #define MCHP_I2SMCC_SR 0x000C /* Status Register */
34 #define MCHP_I2SMCC_IERA 0x0010 /* Interrupt Enable Register A */
35 #define MCHP_I2SMCC_IDRA 0x0014 /* Interrupt Disable Register A */
36 #define MCHP_I2SMCC_IMRA 0x0018 /* Interrupt Mask Register A */
37 #define MCHP_I2SMCC_ISRA 0X001C /* Interrupt Status Register A */
39 #define MCHP_I2SMCC_IERB 0x0020 /* Interrupt Enable Register B */
40 #define MCHP_I2SMCC_IDRB 0x0024 /* Interrupt Disable Register B */
41 #define MCHP_I2SMCC_IMRB 0x0028 /* Interrupt Mask Register B */
42 #define MCHP_I2SMCC_ISRB 0X002C /* Interrupt Status Register B */
44 #define MCHP_I2SMCC_RHR 0x0030 /* Receiver Holding Register */
45 #define MCHP_I2SMCC_THR 0x0034 /* Transmitter Holding Register */
47 #define MCHP_I2SMCC_RHL0R 0x0040 /* Receiver Holding Left 0 Register */
48 #define MCHP_I2SMCC_RHR0R 0x0044 /* Receiver Holding Right 0 Register */
50 #define MCHP_I2SMCC_RHL1R 0x0048 /* Receiver Holding Left 1 Register */
51 #define MCHP_I2SMCC_RHR1R 0x004C /* Receiver Holding Right 1 Register */
53 #define MCHP_I2SMCC_RHL2R 0x0050 /* Receiver Holding Left 2 Register */
54 #define MCHP_I2SMCC_RHR2R 0x0054 /* Receiver Holding Right 2 Register */
56 #define MCHP_I2SMCC_RHL3R 0x0058 /* Receiver Holding Left 3 Register */
57 #define MCHP_I2SMCC_RHR3R 0x005C /* Receiver Holding Right 3 Register */
59 #define MCHP_I2SMCC_THL0R 0x0060 /* Transmitter Holding Left 0 Register */
60 #define MCHP_I2SMCC_THR0R 0x0064 /* Transmitter Holding Right 0 Register */
62 #define MCHP_I2SMCC_THL1R 0x0068 /* Transmitter Holding Left 1 Register */
63 #define MCHP_I2SMCC_THR1R 0x006C /* Transmitter Holding Right 1 Register */
65 #define MCHP_I2SMCC_THL2R 0x0070 /* Transmitter Holding Left 2 Register */
66 #define MCHP_I2SMCC_THR2R 0x0074 /* Transmitter Holding Right 2 Register */
68 #define MCHP_I2SMCC_THL3R 0x0078 /* Transmitter Holding Left 3 Register */
69 #define MCHP_I2SMCC_THR3R 0x007C /* Transmitter Holding Right 3 Register */
71 #define MCHP_I2SMCC_VERSION 0x00FC /* Version Register */
74 * ---- Control Register (Write-only) ----
76 #define MCHP_I2SMCC_CR_RXEN BIT(0) /* Receiver Enable */
77 #define MCHP_I2SMCC_CR_RXDIS BIT(1) /* Receiver Disable */
78 #define MCHP_I2SMCC_CR_CKEN BIT(2) /* Clock Enable */
79 #define MCHP_I2SMCC_CR_CKDIS BIT(3) /* Clock Disable */
80 #define MCHP_I2SMCC_CR_TXEN BIT(4) /* Transmitter Enable */
81 #define MCHP_I2SMCC_CR_TXDIS BIT(5) /* Transmitter Disable */
82 #define MCHP_I2SMCC_CR_SWRST BIT(7) /* Software Reset */
85 * ---- Mode Register A (Read/Write) ----
87 #define MCHP_I2SMCC_MRA_MODE_MASK GENMASK(0, 0)
88 #define MCHP_I2SMCC_MRA_MODE_SLAVE (0 << 0)
89 #define MCHP_I2SMCC_MRA_MODE_MASTER (1 << 0)
91 #define MCHP_I2SMCC_MRA_DATALENGTH_MASK GENMASK(3, 1)
92 #define MCHP_I2SMCC_MRA_DATALENGTH_32_BITS (0 << 1)
93 #define MCHP_I2SMCC_MRA_DATALENGTH_24_BITS (1 << 1)
94 #define MCHP_I2SMCC_MRA_DATALENGTH_20_BITS (2 << 1)
95 #define MCHP_I2SMCC_MRA_DATALENGTH_18_BITS (3 << 1)
96 #define MCHP_I2SMCC_MRA_DATALENGTH_16_BITS (4 << 1)
97 #define MCHP_I2SMCC_MRA_DATALENGTH_16_BITS_COMPACT (5 << 1)
98 #define MCHP_I2SMCC_MRA_DATALENGTH_8_BITS (6 << 1)
99 #define MCHP_I2SMCC_MRA_DATALENGTH_8_BITS_COMPACT (7 << 1)
101 #define MCHP_I2SMCC_MRA_WIRECFG_MASK GENMASK(5, 4)
102 #define MCHP_I2SMCC_MRA_WIRECFG_I2S_1_TDM_0 (0 << 4)
103 #define MCHP_I2SMCC_MRA_WIRECFG_I2S_2_TDM_1 (1 << 4)
104 #define MCHP_I2SMCC_MRA_WIRECFG_I2S_4_TDM_2 (2 << 4)
105 #define MCHP_I2SMCC_MRA_WIRECFG_TDM_3 (3 << 4)
107 #define MCHP_I2SMCC_MRA_FORMAT_MASK GENMASK(7, 6)
108 #define MCHP_I2SMCC_MRA_FORMAT_I2S (0 << 6)
109 #define MCHP_I2SMCC_MRA_FORMAT_LJ (1 << 6) /* Left Justified */
110 #define MCHP_I2SMCC_MRA_FORMAT_TDM (2 << 6)
111 #define MCHP_I2SMCC_MRA_FORMAT_TDMLJ (3 << 6)
113 /* Transmitter uses one DMA channel ... */
114 /* Left audio samples duplicated to right audio channel */
115 #define MCHP_I2SMCC_MRA_RXMONO BIT(8)
117 /* I2SDO output of I2SC is internally connected to I2SDI input */
118 #define MCHP_I2SMCC_MRA_RXLOOP BIT(9)
120 /* Receiver uses one DMA channel ... */
121 /* Left audio samples duplicated to right audio channel */
122 #define MCHP_I2SMCC_MRA_TXMONO BIT(10)
124 /* x sample transmitted when underrun */
125 #define MCHP_I2SMCC_MRA_TXSAME_ZERO (0 << 11) /* Zero sample */
126 #define MCHP_I2SMCC_MRA_TXSAME_PREVIOUS (1 << 11) /* Previous sample */
128 /* select between peripheral clock and generated clock */
129 #define MCHP_I2SMCC_MRA_SRCCLK_PCLK (0 << 12)
130 #define MCHP_I2SMCC_MRA_SRCCLK_GCLK (1 << 12)
132 /* Number of TDM Channels - 1 */
133 #define MCHP_I2SMCC_MRA_NBCHAN_MASK GENMASK(15, 13)
134 #define MCHP_I2SMCC_MRA_NBCHAN(ch) \
135 ((((ch) - 1) << 13) & MCHP_I2SMCC_MRA_NBCHAN_MASK)
137 /* Selected Clock to I2SMCC Master Clock ratio */
138 #define MCHP_I2SMCC_MRA_IMCKDIV_MASK GENMASK(21, 16)
139 #define MCHP_I2SMCC_MRA_IMCKDIV(div) \
140 (((div) << 16) & MCHP_I2SMCC_MRA_IMCKDIV_MASK)
142 /* TDM Frame Synchronization */
143 #define MCHP_I2SMCC_MRA_TDMFS_MASK GENMASK(23, 22)
144 #define MCHP_I2SMCC_MRA_TDMFS_SLOT (0 << 22)
145 #define MCHP_I2SMCC_MRA_TDMFS_HALF (1 << 22)
146 #define MCHP_I2SMCC_MRA_TDMFS_BIT (2 << 22)
148 /* Selected Clock to I2SMC Serial Clock ratio */
149 #define MCHP_I2SMCC_MRA_ISCKDIV_MASK GENMASK(29, 24)
150 #define MCHP_I2SMCC_MRA_ISCKDIV(div) \
151 (((div) << 24) & MCHP_I2SMCC_MRA_ISCKDIV_MASK)
153 /* Master Clock mode */
154 #define MCHP_I2SMCC_MRA_IMCKMODE_MASK GENMASK(30, 30)
155 /* 0: No master clock generated*/
156 #define MCHP_I2SMCC_MRA_IMCKMODE_NONE (0 << 30)
157 /* 1: master clock generated (internally generated clock drives I2SMCK pin) */
158 #define MCHP_I2SMCC_MRA_IMCKMODE_GEN (1 << 30)
161 /* 0: slot is 32 bits wide for DATALENGTH = 18/20/24 bits. */
162 /* 1: slot is 24 bits wide for DATALENGTH = 18/20/24 bits. */
163 #define MCHP_I2SMCC_MRA_IWS BIT(31)
166 * ---- Mode Register B (Read/Write) ----
168 /* all enabled I2S left channels are filled first, then I2S right channels */
169 #define MCHP_I2SMCC_MRB_CRAMODE_LEFT_FIRST (0 << 0)
171 * an enabled I2S left channel is filled, then the corresponding right
172 * channel, until all channels are filled
174 #define MCHP_I2SMCC_MRB_CRAMODE_REGULAR (1 << 0)
176 #define MCHP_I2SMCC_MRB_FIFOEN BIT(1)
178 #define MCHP_I2SMCC_MRB_DMACHUNK_MASK GENMASK(9, 8)
179 #define MCHP_I2SMCC_MRB_DMACHUNK(no_words) \
180 (((fls(no_words) - 1) << 8) & MCHP_I2SMCC_MRB_DMACHUNK_MASK)
182 #define MCHP_I2SMCC_MRB_CLKSEL_MASK GENMASK(16, 16)
183 #define MCHP_I2SMCC_MRB_CLKSEL_EXT (0 << 16)
184 #define MCHP_I2SMCC_MRB_CLKSEL_INT (1 << 16)
187 * ---- Status Registers (Read-only) ----
189 #define MCHP_I2SMCC_SR_RXEN BIT(0) /* Receiver Enabled */
190 #define MCHP_I2SMCC_SR_TXEN BIT(4) /* Transmitter Enabled */
193 * ---- Interrupt Enable/Disable/Mask/Status Registers A ----
195 #define MCHP_I2SMCC_INT_TXRDY_MASK(ch) GENMASK((ch) - 1, 0)
196 #define MCHP_I2SMCC_INT_TXRDYCH(ch) BIT(ch)
197 #define MCHP_I2SMCC_INT_TXUNF_MASK(ch) GENMASK((ch) + 7, 8)
198 #define MCHP_I2SMCC_INT_TXUNFCH(ch) BIT((ch) + 8)
199 #define MCHP_I2SMCC_INT_RXRDY_MASK(ch) GENMASK((ch) + 15, 16)
200 #define MCHP_I2SMCC_INT_RXRDYCH(ch) BIT((ch) + 16)
201 #define MCHP_I2SMCC_INT_RXOVF_MASK(ch) GENMASK((ch) + 23, 24)
202 #define MCHP_I2SMCC_INT_RXOVFCH(ch) BIT((ch) + 24)
205 * ---- Interrupt Enable/Disable/Mask/Status Registers B ----
207 #define MCHP_I2SMCC_INT_WERR BIT(0)
208 #define MCHP_I2SMCC_INT_TXFFRDY BIT(8)
209 #define MCHP_I2SMCC_INT_TXFFEMP BIT(9)
210 #define MCHP_I2SMCC_INT_RXFFRDY BIT(12)
211 #define MCHP_I2SMCC_INT_RXFFFUL BIT(13)
214 * ---- Version Register (Read-only) ----
216 #define MCHP_I2SMCC_VERSION_MASK GENMASK(11, 0)
218 #define MCHP_I2SMCC_MAX_CHANNELS 8
219 #define MCHP_I2MCC_TDM_SLOT_WIDTH 32
221 static const struct regmap_config mchp_i2s_mcc_regmap_config = {
225 .max_register = MCHP_I2SMCC_VERSION,
228 struct mchp_i2s_mcc_dev {
229 struct wait_queue_head wq_txrdy;
230 struct wait_queue_head wq_rxrdy;
232 struct regmap *regmap;
235 struct snd_dmaengine_dai_dma_data playback;
236 struct snd_dmaengine_dai_dma_data capture;
239 unsigned int frame_length;
248 static irqreturn_t mchp_i2s_mcc_interrupt(int irq, void *dev_id)
250 struct mchp_i2s_mcc_dev *dev = dev_id;
251 u32 sra, imra, srb, imrb, pendinga, pendingb, idra = 0;
252 irqreturn_t ret = IRQ_NONE;
254 regmap_read(dev->regmap, MCHP_I2SMCC_IMRA, &imra);
255 regmap_read(dev->regmap, MCHP_I2SMCC_ISRA, &sra);
256 pendinga = imra & sra;
258 regmap_read(dev->regmap, MCHP_I2SMCC_IMRB, &imrb);
259 regmap_read(dev->regmap, MCHP_I2SMCC_ISRB, &srb);
260 pendingb = imrb & srb;
262 if (!pendinga && !pendingb)
266 * Tx/Rx ready interrupts are enabled when stopping only, to assure
267 * availability and to disable clocks if necessary
269 idra |= pendinga & (MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels) |
270 MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels));
274 if ((imra & MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels)) &&
275 (imra & MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels)) ==
276 (idra & MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels))) {
278 wake_up_interruptible(&dev->wq_txrdy);
280 if ((imra & MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels)) &&
281 (imra & MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels)) ==
282 (idra & MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels))) {
284 wake_up_interruptible(&dev->wq_rxrdy);
286 regmap_write(dev->regmap, MCHP_I2SMCC_IDRA, idra);
291 static int mchp_i2s_mcc_set_sysclk(struct snd_soc_dai *dai,
292 int clk_id, unsigned int freq, int dir)
294 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
296 dev_dbg(dev->dev, "%s() clk_id=%d freq=%u dir=%d\n",
297 __func__, clk_id, freq, dir);
299 /* We do not need SYSCLK */
300 if (dir == SND_SOC_CLOCK_IN)
308 static int mchp_i2s_mcc_set_bclk_ratio(struct snd_soc_dai *dai,
311 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
313 dev_dbg(dev->dev, "%s() ratio=%u\n", __func__, ratio);
315 dev->frame_length = ratio;
320 static int mchp_i2s_mcc_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt)
322 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
324 dev_dbg(dev->dev, "%s() fmt=%#x\n", __func__, fmt);
326 /* We don't support any kind of clock inversion */
327 if ((fmt & SND_SOC_DAIFMT_INV_MASK) != SND_SOC_DAIFMT_NB_NF)
330 /* We can't generate only FSYNC */
331 if ((fmt & SND_SOC_DAIFMT_MASTER_MASK) == SND_SOC_DAIFMT_CBM_CFS)
334 /* We can only reconfigure the IP when it's stopped */
335 if (fmt & SND_SOC_DAIFMT_CONT)
343 static int mchp_i2s_mcc_set_dai_tdm_slot(struct snd_soc_dai *dai,
344 unsigned int tx_mask,
345 unsigned int rx_mask,
346 int slots, int slot_width)
348 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
351 "%s() tx_mask=0x%08x rx_mask=0x%08x slots=%d width=%d\n",
352 __func__, tx_mask, rx_mask, slots, slot_width);
354 if (slots < 0 || slots > MCHP_I2SMCC_MAX_CHANNELS ||
355 slot_width != MCHP_I2MCC_TDM_SLOT_WIDTH)
359 /* We do not support daisy chain */
360 if (rx_mask != GENMASK(slots - 1, 0) ||
365 dev->tdm_slots = slots;
366 dev->frame_length = slots * MCHP_I2MCC_TDM_SLOT_WIDTH;
371 static int mchp_i2s_mcc_clk_get_rate_diff(struct clk *clk,
373 struct clk **best_clk,
374 unsigned long *best_rate,
375 unsigned long *best_diff_rate)
378 unsigned int diff_rate;
380 round_rate = clk_round_rate(clk, rate);
382 return (int)round_rate;
384 diff_rate = abs(rate - round_rate);
385 if (diff_rate < *best_diff_rate) {
387 *best_diff_rate = diff_rate;
394 static int mchp_i2s_mcc_config_divs(struct mchp_i2s_mcc_dev *dev,
395 unsigned int bclk, unsigned int *mra)
397 unsigned long clk_rate;
398 unsigned long lcm_rate;
399 unsigned long best_rate = 0;
400 unsigned long best_diff_rate = ~0;
402 struct clk *best_clk = NULL;
405 /* For code simplification */
409 sysclk = dev->sysclk;
412 * MCLK is Selected CLK / (2 * IMCKDIV),
413 * BCLK is Selected CLK / (2 * ISCKDIV);
414 * if IMCKDIV or ISCKDIV are 0, MCLK or BCLK = Selected CLK
416 lcm_rate = lcm(sysclk, bclk);
417 if ((lcm_rate / sysclk % 2 == 1 && lcm_rate / sysclk > 2) ||
418 (lcm_rate / bclk % 2 == 1 && lcm_rate / bclk > 2))
421 for (clk_rate = lcm_rate;
422 (clk_rate == sysclk || clk_rate / (sysclk * 2) <= GENMASK(5, 0)) &&
423 (clk_rate == bclk || clk_rate / (bclk * 2) <= GENMASK(5, 0));
424 clk_rate += lcm_rate) {
425 ret = mchp_i2s_mcc_clk_get_rate_diff(dev->gclk, clk_rate,
426 &best_clk, &best_rate,
429 dev_err(dev->dev, "gclk error for rate %lu: %d",
432 if (!best_diff_rate) {
433 dev_dbg(dev->dev, "found perfect rate on gclk: %lu\n",
439 ret = mchp_i2s_mcc_clk_get_rate_diff(dev->pclk, clk_rate,
440 &best_clk, &best_rate,
443 dev_err(dev->dev, "pclk error for rate %lu: %d",
446 if (!best_diff_rate) {
447 dev_dbg(dev->dev, "found perfect rate on pclk: %lu\n",
454 /* check if clocks returned only errors */
456 dev_err(dev->dev, "unable to change rate to clocks\n");
460 dev_dbg(dev->dev, "source CLK is %s with rate %lu, diff %lu\n",
461 best_clk == dev->pclk ? "pclk" : "gclk",
462 best_rate, best_diff_rate);
465 ret = clk_set_rate(best_clk, best_rate);
467 dev_err(dev->dev, "unable to set rate %lu to %s: %d\n",
468 best_rate, best_clk == dev->pclk ? "PCLK" : "GCLK",
473 /* Configure divisors */
475 *mra |= MCHP_I2SMCC_MRA_IMCKDIV(best_rate / (2 * sysclk));
476 *mra |= MCHP_I2SMCC_MRA_ISCKDIV(best_rate / (2 * bclk));
478 if (best_clk == dev->gclk) {
479 *mra |= MCHP_I2SMCC_MRA_SRCCLK_GCLK;
480 ret = clk_prepare(dev->gclk);
482 dev_err(dev->dev, "unable to prepare GCLK: %d\n", ret);
486 *mra |= MCHP_I2SMCC_MRA_SRCCLK_PCLK;
493 static int mchp_i2s_mcc_is_running(struct mchp_i2s_mcc_dev *dev)
497 regmap_read(dev->regmap, MCHP_I2SMCC_SR, &sr);
498 return !!(sr & (MCHP_I2SMCC_SR_TXEN | MCHP_I2SMCC_SR_RXEN));
501 static int mchp_i2s_mcc_hw_params(struct snd_pcm_substream *substream,
502 struct snd_pcm_hw_params *params,
503 struct snd_soc_dai *dai)
505 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
508 unsigned int channels = params_channels(params);
509 unsigned int frame_length = dev->frame_length;
510 unsigned int bclk_rate;
513 bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
515 dev_dbg(dev->dev, "%s() rate=%u format=%#x width=%u channels=%u\n",
516 __func__, params_rate(params), params_format(params),
517 params_width(params), params_channels(params));
519 switch (dev->fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
520 case SND_SOC_DAIFMT_I2S:
521 if (dev->tdm_slots) {
522 dev_err(dev->dev, "I2S with TDM is not supported\n");
525 mra |= MCHP_I2SMCC_MRA_FORMAT_I2S;
527 case SND_SOC_DAIFMT_LEFT_J:
528 if (dev->tdm_slots) {
529 dev_err(dev->dev, "Left-Justified with TDM is not supported\n");
532 mra |= MCHP_I2SMCC_MRA_FORMAT_LJ;
534 case SND_SOC_DAIFMT_DSP_A:
535 mra |= MCHP_I2SMCC_MRA_FORMAT_TDM;
538 dev_err(dev->dev, "unsupported bus format\n");
542 switch (dev->fmt & SND_SOC_DAIFMT_MASTER_MASK) {
543 case SND_SOC_DAIFMT_CBS_CFS:
544 /* cpu is BCLK and LRC master */
545 mra |= MCHP_I2SMCC_MRA_MODE_MASTER;
547 mra |= MCHP_I2SMCC_MRA_IMCKMODE_GEN;
550 case SND_SOC_DAIFMT_CBS_CFM:
551 /* cpu is BCLK master */
552 mrb |= MCHP_I2SMCC_MRB_CLKSEL_INT;
555 case SND_SOC_DAIFMT_CBM_CFM:
557 mra |= MCHP_I2SMCC_MRA_MODE_SLAVE;
559 dev_warn(dev->dev, "Unable to generate MCLK in Slave mode\n");
562 dev_err(dev->dev, "unsupported master/slave mode\n");
566 if (dev->fmt & (SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_LEFT_J)) {
570 mra |= MCHP_I2SMCC_MRA_TXMONO;
572 mra |= MCHP_I2SMCC_MRA_RXMONO;
577 dev_err(dev->dev, "unsupported number of audio channels\n");
582 frame_length = 2 * params_physical_width(params);
583 } else if (dev->fmt & SND_SOC_DAIFMT_DSP_A) {
584 if (dev->tdm_slots) {
585 if (channels % 2 && channels * 2 <= dev->tdm_slots) {
587 * Duplicate data for even-numbered channels
588 * to odd-numbered channels
591 mra |= MCHP_I2SMCC_MRA_TXMONO;
593 mra |= MCHP_I2SMCC_MRA_RXMONO;
595 channels = dev->tdm_slots;
598 mra |= MCHP_I2SMCC_MRA_NBCHAN(channels);
600 frame_length = channels * MCHP_I2MCC_TDM_SLOT_WIDTH;
604 * We must have the same burst size configured
605 * in the DMA transfer and in out IP
607 mrb |= MCHP_I2SMCC_MRB_DMACHUNK(channels);
609 dev->playback.maxburst = 1 << (fls(channels) - 1);
611 dev->capture.maxburst = 1 << (fls(channels) - 1);
613 switch (params_format(params)) {
614 case SNDRV_PCM_FORMAT_S8:
615 mra |= MCHP_I2SMCC_MRA_DATALENGTH_8_BITS;
617 case SNDRV_PCM_FORMAT_S16_LE:
618 mra |= MCHP_I2SMCC_MRA_DATALENGTH_16_BITS;
620 case SNDRV_PCM_FORMAT_S18_3LE:
621 mra |= MCHP_I2SMCC_MRA_DATALENGTH_18_BITS |
624 case SNDRV_PCM_FORMAT_S20_3LE:
625 mra |= MCHP_I2SMCC_MRA_DATALENGTH_20_BITS |
628 case SNDRV_PCM_FORMAT_S24_3LE:
629 mra |= MCHP_I2SMCC_MRA_DATALENGTH_24_BITS |
632 case SNDRV_PCM_FORMAT_S24_LE:
633 mra |= MCHP_I2SMCC_MRA_DATALENGTH_24_BITS;
635 case SNDRV_PCM_FORMAT_S32_LE:
636 mra |= MCHP_I2SMCC_MRA_DATALENGTH_32_BITS;
639 dev_err(dev->dev, "unsupported size/endianness for audio samples\n");
644 * If we are already running, the wanted setup must be
645 * the same with the one that's currently ongoing
647 if (mchp_i2s_mcc_is_running(dev)) {
651 regmap_read(dev->regmap, MCHP_I2SMCC_MRA, &mra_cur);
652 regmap_read(dev->regmap, MCHP_I2SMCC_MRB, &mrb_cur);
653 if (mra != mra_cur || mrb != mrb_cur)
659 /* Save the number of channels to know what interrupts to enable */
660 dev->channels = channels;
663 bclk_rate = frame_length * params_rate(params);
664 ret = mchp_i2s_mcc_config_divs(dev, bclk_rate, &mra);
666 dev_err(dev->dev, "unable to configure the divisors: %d\n",
672 ret = regmap_write(dev->regmap, MCHP_I2SMCC_MRA, mra);
675 clk_unprepare(dev->gclk);
680 return regmap_write(dev->regmap, MCHP_I2SMCC_MRB, mrb);
683 static int mchp_i2s_mcc_hw_free(struct snd_pcm_substream *substream,
684 struct snd_soc_dai *dai)
686 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
687 bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
691 err = wait_event_interruptible_timeout(dev->wq_txrdy,
693 msecs_to_jiffies(500));
695 dev_warn_once(dev->dev,
696 "Timeout waiting for Tx ready\n");
697 regmap_write(dev->regmap, MCHP_I2SMCC_IDRA,
698 MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels));
702 err = wait_event_interruptible_timeout(dev->wq_rxrdy,
704 msecs_to_jiffies(500));
706 dev_warn_once(dev->dev,
707 "Timeout waiting for Rx ready\n");
708 regmap_write(dev->regmap, MCHP_I2SMCC_IDRA,
709 MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels));
714 if (!mchp_i2s_mcc_is_running(dev)) {
715 regmap_write(dev->regmap, MCHP_I2SMCC_CR, MCHP_I2SMCC_CR_CKDIS);
717 if (dev->gclk_running) {
718 clk_disable(dev->gclk);
719 dev->gclk_running = 0;
722 clk_unprepare(dev->gclk);
730 static int mchp_i2s_mcc_trigger(struct snd_pcm_substream *substream, int cmd,
731 struct snd_soc_dai *dai)
733 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
734 bool is_playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
741 case SNDRV_PCM_TRIGGER_START:
742 case SNDRV_PCM_TRIGGER_RESUME:
743 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
745 cr = MCHP_I2SMCC_CR_TXEN | MCHP_I2SMCC_CR_CKEN;
747 cr = MCHP_I2SMCC_CR_RXEN | MCHP_I2SMCC_CR_CKEN;
749 case SNDRV_PCM_TRIGGER_STOP:
750 case SNDRV_PCM_TRIGGER_SUSPEND:
751 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
752 regmap_read(dev->regmap, MCHP_I2SMCC_SR, &sr);
753 if (is_playback && (sr & MCHP_I2SMCC_SR_TXEN)) {
754 cr = MCHP_I2SMCC_CR_TXDIS;
757 * Enable Tx Ready interrupts on all channels
758 * to assure all data is sent
760 iera = MCHP_I2SMCC_INT_TXRDY_MASK(dev->channels);
761 } else if (!is_playback && (sr & MCHP_I2SMCC_SR_RXEN)) {
762 cr = MCHP_I2SMCC_CR_RXDIS;
765 * Enable Rx Ready interrupts on all channels
766 * to assure all data is received
768 iera = MCHP_I2SMCC_INT_RXRDY_MASK(dev->channels);
775 if ((cr & MCHP_I2SMCC_CR_CKEN) && dev->gclk_use &&
776 !dev->gclk_running) {
777 err = clk_enable(dev->gclk);
779 dev_err_once(dev->dev, "failed to enable GCLK: %d\n",
782 dev->gclk_running = 1;
786 regmap_write(dev->regmap, MCHP_I2SMCC_IERA, iera);
787 regmap_write(dev->regmap, MCHP_I2SMCC_CR, cr);
792 static int mchp_i2s_mcc_startup(struct snd_pcm_substream *substream,
793 struct snd_soc_dai *dai)
795 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
797 /* Software reset the IP if it's not running */
798 if (!mchp_i2s_mcc_is_running(dev)) {
799 return regmap_write(dev->regmap, MCHP_I2SMCC_CR,
800 MCHP_I2SMCC_CR_SWRST);
806 static const struct snd_soc_dai_ops mchp_i2s_mcc_dai_ops = {
807 .set_sysclk = mchp_i2s_mcc_set_sysclk,
808 .set_bclk_ratio = mchp_i2s_mcc_set_bclk_ratio,
809 .startup = mchp_i2s_mcc_startup,
810 .trigger = mchp_i2s_mcc_trigger,
811 .hw_params = mchp_i2s_mcc_hw_params,
812 .hw_free = mchp_i2s_mcc_hw_free,
813 .set_fmt = mchp_i2s_mcc_set_dai_fmt,
814 .set_tdm_slot = mchp_i2s_mcc_set_dai_tdm_slot,
817 static int mchp_i2s_mcc_dai_probe(struct snd_soc_dai *dai)
819 struct mchp_i2s_mcc_dev *dev = snd_soc_dai_get_drvdata(dai);
821 init_waitqueue_head(&dev->wq_txrdy);
822 init_waitqueue_head(&dev->wq_rxrdy);
826 snd_soc_dai_init_dma_data(dai, &dev->playback, &dev->capture);
831 #define MCHP_I2SMCC_RATES SNDRV_PCM_RATE_8000_192000
833 #define MCHP_I2SMCC_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
834 SNDRV_PCM_FMTBIT_S16_LE | \
835 SNDRV_PCM_FMTBIT_S18_3LE | \
836 SNDRV_PCM_FMTBIT_S20_3LE | \
837 SNDRV_PCM_FMTBIT_S24_3LE | \
838 SNDRV_PCM_FMTBIT_S24_LE | \
839 SNDRV_PCM_FMTBIT_S32_LE)
841 static struct snd_soc_dai_driver mchp_i2s_mcc_dai = {
842 .probe = mchp_i2s_mcc_dai_probe,
844 .stream_name = "I2SMCC-Playback",
847 .rates = MCHP_I2SMCC_RATES,
848 .formats = MCHP_I2SMCC_FORMATS,
851 .stream_name = "I2SMCC-Capture",
854 .rates = MCHP_I2SMCC_RATES,
855 .formats = MCHP_I2SMCC_FORMATS,
857 .ops = &mchp_i2s_mcc_dai_ops,
858 .symmetric_rates = 1,
859 .symmetric_samplebits = 1,
860 .symmetric_channels = 1,
863 static const struct snd_soc_component_driver mchp_i2s_mcc_component = {
864 .name = "mchp-i2s-mcc",
868 static const struct of_device_id mchp_i2s_mcc_dt_ids[] = {
870 .compatible = "microchip,sam9x60-i2smcc",
874 MODULE_DEVICE_TABLE(of, mchp_i2s_mcc_dt_ids);
877 static int mchp_i2s_mcc_probe(struct platform_device *pdev)
879 struct mchp_i2s_mcc_dev *dev;
880 struct resource *mem;
881 struct regmap *regmap;
887 dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
891 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
892 base = devm_ioremap_resource(&pdev->dev, mem);
894 return PTR_ERR(base);
896 regmap = devm_regmap_init_mmio(&pdev->dev, base,
897 &mchp_i2s_mcc_regmap_config);
899 return PTR_ERR(regmap);
901 irq = platform_get_irq(pdev, 0);
905 err = devm_request_irq(&pdev->dev, irq, mchp_i2s_mcc_interrupt, 0,
906 dev_name(&pdev->dev), dev);
910 dev->pclk = devm_clk_get(&pdev->dev, "pclk");
911 if (IS_ERR(dev->pclk)) {
912 err = PTR_ERR(dev->pclk);
914 "failed to get the peripheral clock: %d\n", err);
918 /* Get the optional generated clock */
919 dev->gclk = devm_clk_get(&pdev->dev, "gclk");
920 if (IS_ERR(dev->gclk)) {
921 if (PTR_ERR(dev->gclk) == -EPROBE_DEFER)
922 return -EPROBE_DEFER;
924 "generated clock not found: %d\n", err);
928 dev->dev = &pdev->dev;
929 dev->regmap = regmap;
930 platform_set_drvdata(pdev, dev);
932 err = clk_prepare_enable(dev->pclk);
935 "failed to enable the peripheral clock: %d\n", err);
939 err = devm_snd_soc_register_component(&pdev->dev,
940 &mchp_i2s_mcc_component,
941 &mchp_i2s_mcc_dai, 1);
943 dev_err(&pdev->dev, "failed to register DAI: %d\n", err);
944 clk_disable_unprepare(dev->pclk);
948 dev->playback.addr = (dma_addr_t)mem->start + MCHP_I2SMCC_THR;
949 dev->capture.addr = (dma_addr_t)mem->start + MCHP_I2SMCC_RHR;
951 err = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
953 dev_err(&pdev->dev, "failed to register PCM: %d\n", err);
954 clk_disable_unprepare(dev->pclk);
958 /* Get IP version. */
959 regmap_read(dev->regmap, MCHP_I2SMCC_VERSION, &version);
960 dev_info(&pdev->dev, "hw version: %#lx\n",
961 version & MCHP_I2SMCC_VERSION_MASK);
966 static int mchp_i2s_mcc_remove(struct platform_device *pdev)
968 struct mchp_i2s_mcc_dev *dev = platform_get_drvdata(pdev);
970 clk_disable_unprepare(dev->pclk);
975 static struct platform_driver mchp_i2s_mcc_driver = {
977 .name = "mchp_i2s_mcc",
978 .of_match_table = of_match_ptr(mchp_i2s_mcc_dt_ids),
980 .probe = mchp_i2s_mcc_probe,
981 .remove = mchp_i2s_mcc_remove,
983 module_platform_driver(mchp_i2s_mcc_driver);
985 MODULE_DESCRIPTION("Microchip I2S Multi-Channel Controller driver");
986 MODULE_AUTHOR("Codrin Ciubotariu <codrin.ciubotariu@microchip.com>");
987 MODULE_LICENSE("GPL v2");