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