1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
4 *
5 * Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
6 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
7 *
8 * DT support (c) 2016 Petr Kulhavy, Barix AG <petr@barix.com>
9 * based on davinci-mcasp.c DT support
10 *
11 * TODO:
12 * on DA850 implement HW FIFOs instead of DMA into DXR and DRR registers
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/device.h>
18 #include <linux/slab.h>
19 #include <linux/delay.h>
20 #include <linux/io.h>
21 #include <linux/clk.h>
22
23 #include <sound/core.h>
24 #include <sound/pcm.h>
25 #include <sound/pcm_params.h>
26 #include <sound/initval.h>
27 #include <sound/soc.h>
28 #include <sound/dmaengine_pcm.h>
29
30 #include "edma-pcm.h"
31 #include "davinci-i2s.h"
32
33 #define DRV_NAME "davinci-i2s"
34
35 /*
36 * NOTE: terminology here is confusing.
37 *
38 * - This driver supports the "Audio Serial Port" (ASP),
39 * found on dm6446, dm355, and other DaVinci chips.
40 *
41 * - But it labels it a "Multi-channel Buffered Serial Port"
42 * (McBSP) as on older chips like the dm642 ... which was
43 * backward-compatible, possibly explaining that confusion.
44 *
45 * - OMAP chips have a controller called McBSP, which is
46 * incompatible with the DaVinci flavor of McBSP.
47 *
48 * - Newer DaVinci chips have a controller called McASP,
49 * incompatible with ASP and with either McBSP.
50 *
51 * In short: this uses ASP to implement I2S, not McBSP.
52 * And it won't be the only DaVinci implemention of I2S.
53 */
54 #define DAVINCI_MCBSP_DRR_REG 0x00
55 #define DAVINCI_MCBSP_DXR_REG 0x04
56 #define DAVINCI_MCBSP_SPCR_REG 0x08
57 #define DAVINCI_MCBSP_RCR_REG 0x0c
58 #define DAVINCI_MCBSP_XCR_REG 0x10
59 #define DAVINCI_MCBSP_SRGR_REG 0x14
60 #define DAVINCI_MCBSP_PCR_REG 0x24
61
62 #define DAVINCI_MCBSP_SPCR_RRST (1 << 0)
63 #define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4)
64 #define DAVINCI_MCBSP_SPCR_RJUST(v) ((v) << 13)
65 #define DAVINCI_MCBSP_SPCR_RJUST_Z_LE DAVINCI_MCBSP_SPCR_RJUST(0)
66 #define DAVINCI_MCBSP_SPCR_RJUST_S_LE DAVINCI_MCBSP_SPCR_RJUST(1)
67 #define DAVINCI_MCBSP_SPCR_XRST (1 << 16)
68 #define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20)
69 #define DAVINCI_MCBSP_SPCR_GRST (1 << 22)
70 #define DAVINCI_MCBSP_SPCR_FRST (1 << 23)
71 #define DAVINCI_MCBSP_SPCR_FREE (1 << 25)
72
73 #define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5)
74 #define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8)
75 #define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16)
76 #define DAVINCI_MCBSP_RCR_RFIG (1 << 18)
77 #define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21)
78 #define DAVINCI_MCBSP_RCR_RFRLEN2(v) ((v) << 24)
79 #define DAVINCI_MCBSP_RCR_RPHASE BIT(31)
80
81 #define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5)
82 #define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8)
83 #define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16)
84 #define DAVINCI_MCBSP_XCR_XFIG (1 << 18)
85 #define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21)
86 #define DAVINCI_MCBSP_XCR_XFRLEN2(v) ((v) << 24)
87 #define DAVINCI_MCBSP_XCR_XPHASE BIT(31)
88
89 #define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8)
90 #define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16)
91 #define DAVINCI_MCBSP_SRGR_FSGM (1 << 28)
92 #define DAVINCI_MCBSP_SRGR_CLKSM BIT(29)
93
94 #define DAVINCI_MCBSP_PCR_CLKRP (1 << 0)
95 #define DAVINCI_MCBSP_PCR_CLKXP (1 << 1)
96 #define DAVINCI_MCBSP_PCR_FSRP (1 << 2)
97 #define DAVINCI_MCBSP_PCR_FSXP (1 << 3)
98 #define DAVINCI_MCBSP_PCR_SCLKME (1 << 7)
99 #define DAVINCI_MCBSP_PCR_CLKRM (1 << 8)
100 #define DAVINCI_MCBSP_PCR_CLKXM (1 << 9)
101 #define DAVINCI_MCBSP_PCR_FSRM (1 << 10)
102 #define DAVINCI_MCBSP_PCR_FSXM (1 << 11)
103
104 enum {
105 DAVINCI_MCBSP_WORD_8 = 0,
106 DAVINCI_MCBSP_WORD_12,
107 DAVINCI_MCBSP_WORD_16,
108 DAVINCI_MCBSP_WORD_20,
109 DAVINCI_MCBSP_WORD_24,
110 DAVINCI_MCBSP_WORD_32,
111 };
112
113 static const unsigned char asp_word_length[SNDRV_PCM_FORMAT_S32_LE + 1] = {
114 [SNDRV_PCM_FORMAT_S8] = DAVINCI_MCBSP_WORD_8,
115 [SNDRV_PCM_FORMAT_S16_LE] = DAVINCI_MCBSP_WORD_16,
116 [SNDRV_PCM_FORMAT_S24_LE] = DAVINCI_MCBSP_WORD_24,
117 [SNDRV_PCM_FORMAT_S32_LE] = DAVINCI_MCBSP_WORD_32,
118 };
119
120 static const unsigned char double_fmt[SNDRV_PCM_FORMAT_S32_LE + 1] = {
121 [SNDRV_PCM_FORMAT_S8] = SNDRV_PCM_FORMAT_S16_LE,
122 [SNDRV_PCM_FORMAT_S16_LE] = SNDRV_PCM_FORMAT_S32_LE,
123 };
124
125 struct davinci_mcbsp_dev {
126 struct device *dev;
127 struct snd_dmaengine_dai_dma_data dma_data[2];
128 int dma_request[2];
129 void __iomem *base;
130 #define MOD_DSP_A 0
131 #define MOD_DSP_B 1
132 int mode;
133 u32 pcr;
134 struct clk *clk;
135 struct clk *ext_clk;
136 /*
137 * Combining both channels into 1 element will at least double the
138 * amount of time between servicing the dma channel, increase
139 * effiency, and reduce the chance of overrun/underrun. But,
140 * it will result in the left & right channels being swapped.
141 *
142 * If relabeling the left and right channels is not possible,
143 * you may want to let the codec know to swap them back.
144 *
145 * It may allow x10 the amount of time to service dma requests,
146 * if the codec is master and is using an unnecessarily fast bit clock
147 * (ie. tlvaic23b), independent of the sample rate. So, having an
148 * entire frame at once means it can be serviced at the sample rate
149 * instead of the bit clock rate.
150 *
151 * In the now unlikely case that an underrun still
152 * occurs, both the left and right samples will be repeated
153 * so that no pops are heard, and the left and right channels
154 * won't end up being swapped because of the underrun.
155 */
156 unsigned enable_channel_combine:1;
157
158 unsigned int fmt;
159 int clk_div;
160 bool i2s_accurate_sck;
161
162 int tdm_slots;
163 int slot_width;
164
165 bool tx_framing_bit;
166 bool rx_framing_bit;
167 };
168
169 static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
170 int reg, u32 val)
171 {
172 __raw_writel(val, dev->base + reg);
173 }
174
175 static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
176 {
177 return __raw_readl(dev->base + reg);
178 }
179
180 static void toggle_clock(struct davinci_mcbsp_dev *dev, int playback)
181 {
182 u32 m = playback ? DAVINCI_MCBSP_PCR_CLKXP : DAVINCI_MCBSP_PCR_CLKRP;
183 /* The clock needs to toggle to complete reset.
184 * So, fake it by toggling the clk polarity.
185 */
186 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr ^ m);
187 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr);
188 }
189
190 static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev,
191 struct snd_pcm_substream *substream)
192 {
193 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
194 u32 spcr;
195 u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
196
197 /* Enable transmitter or receiver */
198 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
199 spcr |= mask;
200
201 if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM)) {
202 /* Start frame sync */
203 spcr |= DAVINCI_MCBSP_SPCR_FRST;
204 }
205 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
206 }
207
208 static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback)
209 {
210 u32 spcr;
211
212 /* Reset transmitter/receiver and sample rate/frame sync generators */
213 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
214 spcr &= ~(DAVINCI_MCBSP_SPCR_GRST | DAVINCI_MCBSP_SPCR_FRST);
215 spcr &= playback ? ~DAVINCI_MCBSP_SPCR_XRST : ~DAVINCI_MCBSP_SPCR_RRST;
216 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
217 toggle_clock(dev, playback);
218 }
219
220 static int davinci_i2s_tdm_word_length(int tdm_slot_width)
221 {
222 switch (tdm_slot_width) {
223 case 8:
224 return DAVINCI_MCBSP_WORD_8;
225 case 12:
226 return DAVINCI_MCBSP_WORD_12;
227 case 16:
228 return DAVINCI_MCBSP_WORD_16;
229 case 20:
230 return DAVINCI_MCBSP_WORD_20;
231 case 24:
232 return DAVINCI_MCBSP_WORD_24;
233 case 32:
234 return DAVINCI_MCBSP_WORD_32;
235 default:
236 return -EINVAL;
237 }
238 }
239
240 static int davinci_i2s_set_tdm_slot(struct snd_soc_dai *cpu_dai,
241 unsigned int tx_mask,
242 unsigned int rx_mask,
243 int slots, int slot_width)
244 {
245 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
246
247 dev_dbg(dev->dev, "slots %d, slot_width %d\n", slots, slot_width);
248
249 if (slots > 128 || !slots) {
250 dev_err(dev->dev, "Invalid number of slots\n");
251 return -EINVAL;
252 }
253
254 if (rx_mask != (1 << slots) - 1) {
255 dev_err(dev->dev, "Invalid RX mask (0x%08x) : all slots must be used by McBSP\n",
256 rx_mask);
257 return -EINVAL;
258 }
259
260 if (tx_mask != (1 << slots) - 1) {
261 dev_err(dev->dev, "Invalid TX mask (0x%08x) : all slots must be used by McBSP\n",
262 tx_mask);
263 return -EINVAL;
264 }
265
266 if (davinci_i2s_tdm_word_length(slot_width) < 0) {
267 dev_err(dev->dev, "%s: Unsupported slot_width %d\n", __func__, slot_width);
268 return -EINVAL;
269 }
270
271 dev->tdm_slots = slots;
272 dev->slot_width = slot_width;
273
274 return 0;
275 }
276
277 #define DEFAULT_BITPERSAMPLE 16
278
279 static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
280 unsigned int fmt)
281 {
282 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
283 unsigned int pcr;
284 unsigned int spcr;
285 unsigned int srgr;
286 bool inv_fs = false;
287 /* Attention srgr is updated by hw_params! */
288 srgr = DAVINCI_MCBSP_SRGR_FSGM |
289 DAVINCI_MCBSP_SRGR_FPER(DEFAULT_BITPERSAMPLE * 2 - 1) |
290 DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
291
292 dev->fmt = fmt;
293
294 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
295 switch (fmt & SND_SOC_DAIFMT_CLOCK_MASK) {
296 case SND_SOC_DAIFMT_CONT:
297 spcr |= DAVINCI_MCBSP_SPCR_FREE;
298 dev_dbg(dev->dev, "Free-running mode ON\n");
299 break;
300 case SND_SOC_DAIFMT_GATED:
301 spcr &= ~DAVINCI_MCBSP_SPCR_FREE;
302 dev_dbg(dev->dev, "Free-running mode OFF\n");
303 break;
304 default:
305 dev_err(dev->dev, "Invalid clock gating\n");
306 return -EINVAL;
307 }
308 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
309
310 /* set master/slave audio interface */
311 switch (fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK) {
312 case SND_SOC_DAIFMT_BP_FP:
313 /* cpu is master */
314 pcr = DAVINCI_MCBSP_PCR_FSXM |
315 DAVINCI_MCBSP_PCR_FSRM |
316 DAVINCI_MCBSP_PCR_CLKXM |
317 DAVINCI_MCBSP_PCR_CLKRM;
318 break;
319 case SND_SOC_DAIFMT_BC_FP:
320 if (dev->tdm_slots || dev->slot_width) {
321 dev_err(dev->dev, "TDM is not supported for BC_FP format\n");
322 return -EINVAL;
323 }
324
325 /*
326 * McBSP CLKR pin is the input for the Sample Rate Generator.
327 * McBSP FSR and FSX are driven by the Sample Rate Generator.
328 */
329 pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
330 pcr |= DAVINCI_MCBSP_PCR_SCLKME;
331 break;
332 case SND_SOC_DAIFMT_BP_FC:
333 /* cpu is bitclock provider */
334 pcr = DAVINCI_MCBSP_PCR_CLKXM |
335 DAVINCI_MCBSP_PCR_CLKRM;
336 break;
337
338 case SND_SOC_DAIFMT_BC_FC:
339 if (dev->tdm_slots || dev->slot_width) {
340 dev_err(dev->dev, "TDM is not supported for BC_FC format\n");
341 return -EINVAL;
342 }
343
344 /* codec is master */
345 pcr = 0;
346 break;
347 default:
348 printk(KERN_ERR "%s:bad master\n", __func__);
349 return -EINVAL;
350 }
351
352 /* interface format */
353 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
354 case SND_SOC_DAIFMT_I2S:
355 /* Davinci doesn't support TRUE I2S, but some codecs will have
356 * the left and right channels contiguous. This allows
357 * dsp_a mode to be used with an inverted normal frame clk.
358 * If your codec is master and does not have contiguous
359 * channels, then you will have sound on only one channel.
360 * Try using a different mode, or codec as slave.
361 *
362 * The TLV320AIC33 is an example of a codec where this works.
363 * It has a variable bit clock frequency allowing it to have
364 * valid data on every bit clock.
365 *
366 * The TLV320AIC23 is an example of a codec where this does not
367 * work. It has a fixed bit clock frequency with progressively
368 * more empty bit clock slots between channels as the sample
369 * rate is lowered.
370 */
371 inv_fs = true;
372 fallthrough;
373 case SND_SOC_DAIFMT_DSP_A:
374 dev->mode = MOD_DSP_A;
375 break;
376 case SND_SOC_DAIFMT_DSP_B:
377 dev->mode = MOD_DSP_B;
378 break;
379 default:
380 printk(KERN_ERR "%s:bad format\n", __func__);
381 return -EINVAL;
382 }
383
384 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
385 case SND_SOC_DAIFMT_NB_NF:
386 /* CLKRP Receive clock polarity,
387 * 1 - sampled on rising edge of CLKR
388 * valid on rising edge
389 * CLKXP Transmit clock polarity,
390 * 1 - clocked on falling edge of CLKX
391 * valid on rising edge
392 * FSRP Receive frame sync pol, 0 - active high
393 * FSXP Transmit frame sync pol, 0 - active high
394 */
395 pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP);
396 break;
397 case SND_SOC_DAIFMT_IB_IF:
398 /* CLKRP Receive clock polarity,
399 * 0 - sampled on falling edge of CLKR
400 * valid on falling edge
401 * CLKXP Transmit clock polarity,
402 * 0 - clocked on rising edge of CLKX
403 * valid on falling edge
404 * FSRP Receive frame sync pol, 1 - active low
405 * FSXP Transmit frame sync pol, 1 - active low
406 */
407 pcr |= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
408 break;
409 case SND_SOC_DAIFMT_NB_IF:
410 /* CLKRP Receive clock polarity,
411 * 1 - sampled on rising edge of CLKR
412 * valid on rising edge
413 * CLKXP Transmit clock polarity,
414 * 1 - clocked on falling edge of CLKX
415 * valid on rising edge
416 * FSRP Receive frame sync pol, 1 - active low
417 * FSXP Transmit frame sync pol, 1 - active low
418 */
419 pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP |
420 DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
421 break;
422 case SND_SOC_DAIFMT_IB_NF:
423 /* CLKRP Receive clock polarity,
424 * 0 - sampled on falling edge of CLKR
425 * valid on falling edge
426 * CLKXP Transmit clock polarity,
427 * 0 - clocked on rising edge of CLKX
428 * valid on falling edge
429 * FSRP Receive frame sync pol, 0 - active high
430 * FSXP Transmit frame sync pol, 0 - active high
431 */
432 break;
433 default:
434 return -EINVAL;
435 }
436 if (inv_fs == true)
437 pcr ^= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
438 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
439 dev->pcr = pcr;
440 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, pcr);
441 return 0;
442 }
443
444 static int davinci_i2s_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
445 int div_id, int div)
446 {
447 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
448
449 if (div_id != DAVINCI_MCBSP_CLKGDV)
450 return -ENODEV;
451
452 dev->clk_div = div;
453 return 0;
454 }
455
456 static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
457 struct snd_pcm_hw_params *params,
458 struct snd_soc_dai *dai)
459 {
460 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
461 struct snd_interval *i = NULL;
462 int mcbsp_word_length, master;
463 unsigned int clk_div, freq, framesize;
464 unsigned int srgr = 0;
465 unsigned int rcr = 0;
466 unsigned int xcr = 0;
467 u32 spcr;
468 snd_pcm_format_t fmt;
469 unsigned element_cnt = 1;
470
471 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
472
473 /* Determine xfer data type */
474 fmt = params_format(params);
475 switch (fmt) {
476 case SNDRV_PCM_FORMAT_S16_LE:
477 case SNDRV_PCM_FORMAT_S32_LE:
478 break;
479 case SNDRV_PCM_FORMAT_S24_LE:
480 spcr |= DAVINCI_MCBSP_SPCR_RJUST_S_LE;
481 break;
482 default:
483 dev_warn(dev->dev, "davinci-i2s: unsupported PCM format\n");
484 return -EINVAL;
485 }
486
487 /* general line settings */
488 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
489 spcr |= DAVINCI_MCBSP_SPCR_RINTM(3);
490 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
491 } else {
492 spcr |= DAVINCI_MCBSP_SPCR_XINTM(3);
493 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
494 }
495
496 master = dev->fmt & SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
497 fmt = params_format(params);
498 if (dev->slot_width)
499 mcbsp_word_length = davinci_i2s_tdm_word_length(dev->slot_width);
500 else
501 mcbsp_word_length = asp_word_length[fmt];
502
503 if (mcbsp_word_length < 0)
504 return mcbsp_word_length;
505
506 switch (master) {
507 case SND_SOC_DAIFMT_BP_FP:
508 if (dev->ext_clk) {
509 freq = clk_get_rate(dev->ext_clk);
510 } else {
511 freq = clk_get_rate(dev->clk);
512 srgr = DAVINCI_MCBSP_SRGR_CLKSM;
513 }
514 srgr |= DAVINCI_MCBSP_SRGR_FSGM;
515 srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length *
516 8 - 1);
517 if (dev->i2s_accurate_sck) {
518 clk_div = 256;
519 do {
520 framesize = (freq / (--clk_div)) /
521 params->rate_num *
522 params->rate_den;
523 } while (((framesize < 33) || (framesize > 4095)) &&
524 (clk_div));
525 clk_div--;
526 srgr |= DAVINCI_MCBSP_SRGR_FPER(framesize - 1);
527 } else {
528 /* symmetric waveforms */
529 clk_div = freq / (mcbsp_word_length * 16) /
530 params->rate_num * params->rate_den;
531 srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
532 16 - 1);
533 }
534 clk_div &= 0xFF;
535 srgr |= clk_div;
536 break;
537 case SND_SOC_DAIFMT_BC_FP:
538 srgr = DAVINCI_MCBSP_SRGR_FSGM;
539 clk_div = dev->clk_div - 1;
540 srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length * 8 - 1);
541 srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length * 16 - 1);
542 clk_div &= 0xFF;
543 srgr |= clk_div;
544 break;
545 case SND_SOC_DAIFMT_BP_FC:
546 if (dev->ext_clk) {
547 freq = clk_get_rate(dev->ext_clk);
548 } else {
549 freq = clk_get_rate(dev->clk);
550 srgr = DAVINCI_MCBSP_SRGR_CLKSM;
551 }
552 if (dev->tdm_slots && dev->slot_width) {
553 clk_div = freq / (params->rate_num * params->rate_den)
554 / (dev->tdm_slots * dev->slot_width) - 1;
555 } else {
556 clk_div = freq / (mcbsp_word_length * 16) /
557 params->rate_num * params->rate_den;
558 }
559 clk_div &= 0xFF;
560 srgr |= clk_div;
561 break;
562 case SND_SOC_DAIFMT_BC_FC:
563 /* Clock and frame sync given from external sources */
564 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
565 srgr = DAVINCI_MCBSP_SRGR_FSGM;
566 srgr |= DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1);
567 pr_debug("%s - %d FWID set: re-read srgr = %X\n",
568 __func__, __LINE__, snd_interval_value(i) - 1);
569
570 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
571 srgr |= DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1);
572 break;
573 default:
574 return -EINVAL;
575 }
576 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
577
578 if (dev->mode == MOD_DSP_B) {
579 rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0);
580 xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0);
581 } else {
582 rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
583 xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
584 }
585
586 if (dev->tx_framing_bit) {
587 xcr &= ~DAVINCI_MCBSP_XCR_XDATDLY(1);
588 xcr |= DAVINCI_MCBSP_XCR_XDATDLY(2);
589 }
590 if (dev->rx_framing_bit) {
591 rcr &= ~DAVINCI_MCBSP_RCR_RDATDLY(1);
592 rcr |= DAVINCI_MCBSP_RCR_RDATDLY(2);
593 }
594
595 if (params_channels(params) == 2) {
596 element_cnt = 2;
597 if (double_fmt[fmt] && dev->enable_channel_combine) {
598 element_cnt = 1;
599 fmt = double_fmt[fmt];
600 }
601 switch (master) {
602 case SND_SOC_DAIFMT_BP_FP:
603 case SND_SOC_DAIFMT_BP_FC:
604 rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(0);
605 xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(0);
606 rcr |= DAVINCI_MCBSP_RCR_RPHASE;
607 xcr |= DAVINCI_MCBSP_XCR_XPHASE;
608 break;
609 case SND_SOC_DAIFMT_BC_FC:
610 case SND_SOC_DAIFMT_BC_FP:
611 rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(element_cnt - 1);
612 xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(element_cnt - 1);
613 break;
614 default:
615 return -EINVAL;
616 }
617 }
618
619 switch (master) {
620 case SND_SOC_DAIFMT_BP_FP:
621 case SND_SOC_DAIFMT_BP_FC:
622 if (dev->tdm_slots > 0) {
623 rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(dev->tdm_slots - 1);
624 xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(dev->tdm_slots - 1);
625 } else {
626 rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
627 xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
628 }
629 break;
630 case SND_SOC_DAIFMT_BC_FC:
631 case SND_SOC_DAIFMT_BC_FP:
632 rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(element_cnt - 1);
633 xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(element_cnt - 1);
634 break;
635 default:
636 return -EINVAL;
637 }
638
639 rcr |= DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
640 DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length);
641 xcr |= DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
642 DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length);
643
644 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
645 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, xcr);
646 else
647 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, rcr);
648
649 pr_debug("%s - %d srgr=%X\n", __func__, __LINE__, srgr);
650 pr_debug("%s - %d xcr=%X\n", __func__, __LINE__, xcr);
651 pr_debug("%s - %d rcr=%X\n", __func__, __LINE__, rcr);
652 return 0;
653 }
654
655 static int davinci_i2s_prepare(struct snd_pcm_substream *substream,
656 struct snd_soc_dai *dai)
657 {
658 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
659 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
660 u32 spcr;
661 u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
662
663 davinci_mcbsp_stop(dev, playback);
664
665 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
666 if (spcr & mask) {
667 /* start off disabled */
668 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
669 spcr & ~mask);
670 toggle_clock(dev, playback);
671 }
672 if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM |
673 DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM)) {
674 /* Start the sample generator */
675 spcr |= DAVINCI_MCBSP_SPCR_GRST;
676 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
677 }
678
679 if (playback) {
680 /* Enable the transmitter */
681 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
682 spcr |= DAVINCI_MCBSP_SPCR_XRST;
683 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
684
685 /* wait for any unexpected frame sync error to occur */
686 udelay(100);
687
688 /* Disable the transmitter to clear any outstanding XSYNCERR */
689 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
690 spcr &= ~DAVINCI_MCBSP_SPCR_XRST;
691 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
692 toggle_clock(dev, playback);
693 }
694
695 return 0;
696 }
697
698 static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
699 struct snd_soc_dai *dai)
700 {
701 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
702 int ret = 0;
703 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
704
705 switch (cmd) {
706 case SNDRV_PCM_TRIGGER_START:
707 case SNDRV_PCM_TRIGGER_RESUME:
708 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
709 davinci_mcbsp_start(dev, substream);
710 break;
711 case SNDRV_PCM_TRIGGER_STOP:
712 case SNDRV_PCM_TRIGGER_SUSPEND:
713 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
714 davinci_mcbsp_stop(dev, playback);
715 break;
716 default:
717 ret = -EINVAL;
718 }
719 return ret;
720 }
721
722 static void davinci_i2s_shutdown(struct snd_pcm_substream *substream,
723 struct snd_soc_dai *dai)
724 {
725 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
726 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
727 davinci_mcbsp_stop(dev, playback);
728 }
729
730 #define DAVINCI_I2S_RATES SNDRV_PCM_RATE_8000_96000
731 #define DAVINCI_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
732 SNDRV_PCM_FMTBIT_S24_LE | \
733 SNDRV_PCM_FMTBIT_S32_LE)
734
735 static int davinci_i2s_dai_probe(struct snd_soc_dai *dai)
736 {
737 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
738 int stream;
739
740 for_each_pcm_streams(stream)
741 snd_soc_dai_dma_data_set(dai, stream, &dev->dma_data[stream]);
742
743 return 0;
744 }
745
746 static const struct snd_soc_dai_ops davinci_i2s_dai_ops = {
747 .probe = davinci_i2s_dai_probe,
748 .shutdown = davinci_i2s_shutdown,
749 .prepare = davinci_i2s_prepare,
750 .trigger = davinci_i2s_trigger,
751 .hw_params = davinci_i2s_hw_params,
752 .set_fmt = davinci_i2s_set_dai_fmt,
753 .set_clkdiv = davinci_i2s_dai_set_clkdiv,
754 .set_tdm_slot = davinci_i2s_set_tdm_slot,
755
756 };
757
758 static struct snd_soc_dai_driver davinci_i2s_dai = {
759 .playback = {
760 .channels_min = 2,
761 .channels_max = 128,
762 .rates = DAVINCI_I2S_RATES,
763 .formats = DAVINCI_I2S_FORMATS,
764 },
765 .capture = {
766 .channels_min = 2,
767 .channels_max = 128,
768 .rates = DAVINCI_I2S_RATES,
769 .formats = DAVINCI_I2S_FORMATS,
770 },
771 .ops = &davinci_i2s_dai_ops,
772
773 };
774
775 static const struct snd_soc_component_driver davinci_i2s_component = {
776 .name = DRV_NAME,
777 .legacy_dai_naming = 1,
778 };
779
780 static int davinci_i2s_probe(struct platform_device *pdev)
781 {
782 struct snd_dmaengine_dai_dma_data *dma_data;
783 struct davinci_mcbsp_dev *dev;
784 struct resource *mem, *res;
785 void __iomem *io_base;
786 int *dma;
787 int ret;
788
789 mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
790 if (!mem) {
791 dev_warn(&pdev->dev,
792 "\"mpu\" mem resource not found, using index 0\n");
793 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
794 if (!mem) {
795 dev_err(&pdev->dev, "no mem resource?\n");
796 return -ENODEV;
797 }
798 }
799
800 io_base = devm_ioremap_resource(&pdev->dev, mem);
801 if (IS_ERR(io_base))
802 return PTR_ERR(io_base);
803
804 dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_mcbsp_dev),
805 GFP_KERNEL);
806 if (!dev)
807 return -ENOMEM;
808
809 dev->base = io_base;
810
811 dev->tx_framing_bit = of_property_read_bool(pdev->dev.of_node, "ti,T1-framing-tx");
812 dev->rx_framing_bit = of_property_read_bool(pdev->dev.of_node, "ti,T1-framing-rx");
813
814 /* setup DMA, first TX, then RX */
815 dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
816 dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
817
818 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
819 if (res) {
820 dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
821 *dma = res->start;
822 dma_data->filter_data = dma;
823 } else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
824 dma_data->filter_data = "tx";
825 } else {
826 dev_err(&pdev->dev, "Missing DMA tx resource\n");
827 return -ENODEV;
828 }
829
830 dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
831 dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
832
833 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
834 if (res) {
835 dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
836 *dma = res->start;
837 dma_data->filter_data = dma;
838 } else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
839 dma_data->filter_data = "rx";
840 } else {
841 dev_err(&pdev->dev, "Missing DMA rx resource\n");
842 return -ENODEV;
843 }
844
845 /*
846 * The optional is there for backward compatibility.
847 * If 'fck' is not present, the clk_get(dev, NULL) that follows may find something
848 */
849 dev->clk = devm_clk_get_optional(&pdev->dev, "fck");
850 if (IS_ERR(dev->clk))
851 return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk), "Invalid functional clock\n");
852 if (!dev->clk) {
853 dev->clk = devm_clk_get(&pdev->dev, NULL);
854 if (IS_ERR(dev->clk))
855 return dev_err_probe(&pdev->dev, PTR_ERR(dev->clk),
856 "Missing functional clock\n");
857 }
858
859 dev->ext_clk = devm_clk_get_optional(&pdev->dev, "clks");
860 if (IS_ERR(dev->ext_clk))
861 return dev_err_probe(&pdev->dev, PTR_ERR(dev->ext_clk), "Invalid external clock\n");
862
863 ret = clk_prepare_enable(dev->clk);
864 if (ret)
865 return ret;
866
867 if (dev->ext_clk) {
868 dev_dbg(&pdev->dev, "External clock used for sample rate generator\n");
869 ret = clk_prepare_enable(dev->ext_clk);
870 if (ret) {
871 dev_err_probe(&pdev->dev, ret, "Failed to enable external clock\n");
872 goto err_disable_clk;
873 }
874 }
875
876 dev->dev = &pdev->dev;
877 dev_set_drvdata(&pdev->dev, dev);
878
879 ret = snd_soc_register_component(&pdev->dev, &davinci_i2s_component,
880 &davinci_i2s_dai, 1);
881 if (ret != 0)
882 goto err_disable_ext_clk;
883
884 ret = edma_pcm_platform_register(&pdev->dev);
885 if (ret) {
886 dev_err_probe(&pdev->dev, ret, "register PCM failed\n");
887 goto err_unregister_component;
888 }
889
890 return 0;
891
892 err_unregister_component:
893 snd_soc_unregister_component(&pdev->dev);
894 err_disable_ext_clk:
895 if (dev->ext_clk)
896 clk_disable_unprepare(dev->ext_clk);
897 err_disable_clk:
898 clk_disable_unprepare(dev->clk);
899
900 return ret;
901 }
902
903 static void davinci_i2s_remove(struct platform_device *pdev)
904 {
905 struct davinci_mcbsp_dev *dev = dev_get_drvdata(&pdev->dev);
906
907 snd_soc_unregister_component(&pdev->dev);
908
909 clk_disable_unprepare(dev->clk);
910
911 if (dev->ext_clk)
912 clk_disable_unprepare(dev->ext_clk);
913 }
914
915 static const struct of_device_id davinci_i2s_match[] __maybe_unused = {
916 { .compatible = "ti,da850-mcbsp" },
917 {},
918 };
919 MODULE_DEVICE_TABLE(of, davinci_i2s_match);
920
921 static struct platform_driver davinci_mcbsp_driver = {
922 .probe = davinci_i2s_probe,
923 .remove_new = davinci_i2s_remove,
924 .driver = {
925 .name = "davinci-mcbsp",
926 .of_match_table = of_match_ptr(davinci_i2s_match),
927 },
928 };
929
930 module_platform_driver(davinci_mcbsp_driver);
931
932 MODULE_AUTHOR("Vladimir Barinov");
933 MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
934 MODULE_LICENSE("GPL");
935
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