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1/*
2 * ALSA SoC I2S (McBSP) Audio Layer for TI DAVINCI processor
3 *
4 * Author: Vladimir Barinov, <vbarinov@embeddedalley.com>
5 * Copyright: (C) 2007 MontaVista Software, Inc., <source@mvista.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/device.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/io.h>
18#include <linux/clk.h>
19#include <linux/platform_data/davinci_asp.h>
20
21#include <sound/core.h>
22#include <sound/pcm.h>
23#include <sound/pcm_params.h>
24#include <sound/initval.h>
25#include <sound/soc.h>
26#include <sound/dmaengine_pcm.h>
27
28#include "edma-pcm.h"
29#include "davinci-i2s.h"
30
31
32/*
33 * NOTE: terminology here is confusing.
34 *
35 * - This driver supports the "Audio Serial Port" (ASP),
36 * found on dm6446, dm355, and other DaVinci chips.
37 *
38 * - But it labels it a "Multi-channel Buffered Serial Port"
39 * (McBSP) as on older chips like the dm642 ... which was
40 * backward-compatible, possibly explaining that confusion.
41 *
42 * - OMAP chips have a controller called McBSP, which is
43 * incompatible with the DaVinci flavor of McBSP.
44 *
45 * - Newer DaVinci chips have a controller called McASP,
46 * incompatible with ASP and with either McBSP.
47 *
48 * In short: this uses ASP to implement I2S, not McBSP.
49 * And it won't be the only DaVinci implemention of I2S.
50 */
51#define DAVINCI_MCBSP_DRR_REG 0x00
52#define DAVINCI_MCBSP_DXR_REG 0x04
53#define DAVINCI_MCBSP_SPCR_REG 0x08
54#define DAVINCI_MCBSP_RCR_REG 0x0c
55#define DAVINCI_MCBSP_XCR_REG 0x10
56#define DAVINCI_MCBSP_SRGR_REG 0x14
57#define DAVINCI_MCBSP_PCR_REG 0x24
58
59#define DAVINCI_MCBSP_SPCR_RRST (1 << 0)
60#define DAVINCI_MCBSP_SPCR_RINTM(v) ((v) << 4)
61#define DAVINCI_MCBSP_SPCR_XRST (1 << 16)
62#define DAVINCI_MCBSP_SPCR_XINTM(v) ((v) << 20)
63#define DAVINCI_MCBSP_SPCR_GRST (1 << 22)
64#define DAVINCI_MCBSP_SPCR_FRST (1 << 23)
65#define DAVINCI_MCBSP_SPCR_FREE (1 << 25)
66
67#define DAVINCI_MCBSP_RCR_RWDLEN1(v) ((v) << 5)
68#define DAVINCI_MCBSP_RCR_RFRLEN1(v) ((v) << 8)
69#define DAVINCI_MCBSP_RCR_RDATDLY(v) ((v) << 16)
70#define DAVINCI_MCBSP_RCR_RFIG (1 << 18)
71#define DAVINCI_MCBSP_RCR_RWDLEN2(v) ((v) << 21)
72#define DAVINCI_MCBSP_RCR_RFRLEN2(v) ((v) << 24)
73#define DAVINCI_MCBSP_RCR_RPHASE BIT(31)
74
75#define DAVINCI_MCBSP_XCR_XWDLEN1(v) ((v) << 5)
76#define DAVINCI_MCBSP_XCR_XFRLEN1(v) ((v) << 8)
77#define DAVINCI_MCBSP_XCR_XDATDLY(v) ((v) << 16)
78#define DAVINCI_MCBSP_XCR_XFIG (1 << 18)
79#define DAVINCI_MCBSP_XCR_XWDLEN2(v) ((v) << 21)
80#define DAVINCI_MCBSP_XCR_XFRLEN2(v) ((v) << 24)
81#define DAVINCI_MCBSP_XCR_XPHASE BIT(31)
82
83#define DAVINCI_MCBSP_SRGR_FWID(v) ((v) << 8)
84#define DAVINCI_MCBSP_SRGR_FPER(v) ((v) << 16)
85#define DAVINCI_MCBSP_SRGR_FSGM (1 << 28)
86#define DAVINCI_MCBSP_SRGR_CLKSM BIT(29)
87
88#define DAVINCI_MCBSP_PCR_CLKRP (1 << 0)
89#define DAVINCI_MCBSP_PCR_CLKXP (1 << 1)
90#define DAVINCI_MCBSP_PCR_FSRP (1 << 2)
91#define DAVINCI_MCBSP_PCR_FSXP (1 << 3)
92#define DAVINCI_MCBSP_PCR_SCLKME (1 << 7)
93#define DAVINCI_MCBSP_PCR_CLKRM (1 << 8)
94#define DAVINCI_MCBSP_PCR_CLKXM (1 << 9)
95#define DAVINCI_MCBSP_PCR_FSRM (1 << 10)
96#define DAVINCI_MCBSP_PCR_FSXM (1 << 11)
97
98enum {
99 DAVINCI_MCBSP_WORD_8 = 0,
100 DAVINCI_MCBSP_WORD_12,
101 DAVINCI_MCBSP_WORD_16,
102 DAVINCI_MCBSP_WORD_20,
103 DAVINCI_MCBSP_WORD_24,
104 DAVINCI_MCBSP_WORD_32,
105};
106
107static const unsigned char data_type[SNDRV_PCM_FORMAT_S32_LE + 1] = {
108 [SNDRV_PCM_FORMAT_S8] = 1,
109 [SNDRV_PCM_FORMAT_S16_LE] = 2,
110 [SNDRV_PCM_FORMAT_S32_LE] = 4,
111};
112
113static 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_S32_LE] = DAVINCI_MCBSP_WORD_32,
117};
118
119static const unsigned char double_fmt[SNDRV_PCM_FORMAT_S32_LE + 1] = {
120 [SNDRV_PCM_FORMAT_S8] = SNDRV_PCM_FORMAT_S16_LE,
121 [SNDRV_PCM_FORMAT_S16_LE] = SNDRV_PCM_FORMAT_S32_LE,
122};
123
124struct davinci_mcbsp_dev {
125 struct device *dev;
126 struct snd_dmaengine_dai_dma_data dma_data[2];
127 int dma_request[2];
128 void __iomem *base;
129#define MOD_DSP_A 0
130#define MOD_DSP_B 1
131 int mode;
132 u32 pcr;
133 struct clk *clk;
134 /*
135 * Combining both channels into 1 element will at least double the
136 * amount of time between servicing the dma channel, increase
137 * effiency, and reduce the chance of overrun/underrun. But,
138 * it will result in the left & right channels being swapped.
139 *
140 * If relabeling the left and right channels is not possible,
141 * you may want to let the codec know to swap them back.
142 *
143 * It may allow x10 the amount of time to service dma requests,
144 * if the codec is master and is using an unnecessarily fast bit clock
145 * (ie. tlvaic23b), independent of the sample rate. So, having an
146 * entire frame at once means it can be serviced at the sample rate
147 * instead of the bit clock rate.
148 *
149 * In the now unlikely case that an underrun still
150 * occurs, both the left and right samples will be repeated
151 * so that no pops are heard, and the left and right channels
152 * won't end up being swapped because of the underrun.
153 */
154 unsigned enable_channel_combine:1;
155
156 unsigned int fmt;
157 int clk_div;
158 int clk_input_pin;
159 bool i2s_accurate_sck;
160};
161
162static inline void davinci_mcbsp_write_reg(struct davinci_mcbsp_dev *dev,
163 int reg, u32 val)
164{
165 __raw_writel(val, dev->base + reg);
166}
167
168static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
169{
170 return __raw_readl(dev->base + reg);
171}
172
173static void toggle_clock(struct davinci_mcbsp_dev *dev, int playback)
174{
175 u32 m = playback ? DAVINCI_MCBSP_PCR_CLKXP : DAVINCI_MCBSP_PCR_CLKRP;
176 /* The clock needs to toggle to complete reset.
177 * So, fake it by toggling the clk polarity.
178 */
179 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr ^ m);
180 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, dev->pcr);
181}
182
183static void davinci_mcbsp_start(struct davinci_mcbsp_dev *dev,
184 struct snd_pcm_substream *substream)
185{
186 struct snd_soc_pcm_runtime *rtd = substream->private_data;
187 struct snd_soc_platform *platform = rtd->platform;
188 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
189 u32 spcr;
190 u32 mask = playback ? DAVINCI_MCBSP_SPCR_XRST : DAVINCI_MCBSP_SPCR_RRST;
191 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
192 if (spcr & mask) {
193 /* start off disabled */
194 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG,
195 spcr & ~mask);
196 toggle_clock(dev, playback);
197 }
198 if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM |
199 DAVINCI_MCBSP_PCR_CLKXM | DAVINCI_MCBSP_PCR_CLKRM)) {
200 /* Start the sample generator */
201 spcr |= DAVINCI_MCBSP_SPCR_GRST;
202 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
203 }
204
205 if (playback) {
206 /* Stop the DMA to avoid data loss */
207 /* while the transmitter is out of reset to handle XSYNCERR */
208 if (platform->driver->ops->trigger) {
209 int ret = platform->driver->ops->trigger(substream,
210 SNDRV_PCM_TRIGGER_STOP);
211 if (ret < 0)
212 printk(KERN_DEBUG "Playback DMA stop failed\n");
213 }
214
215 /* Enable the transmitter */
216 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
217 spcr |= DAVINCI_MCBSP_SPCR_XRST;
218 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
219
220 /* wait for any unexpected frame sync error to occur */
221 udelay(100);
222
223 /* Disable the transmitter to clear any outstanding XSYNCERR */
224 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
225 spcr &= ~DAVINCI_MCBSP_SPCR_XRST;
226 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
227 toggle_clock(dev, playback);
228
229 /* Restart the DMA */
230 if (platform->driver->ops->trigger) {
231 int ret = platform->driver->ops->trigger(substream,
232 SNDRV_PCM_TRIGGER_START);
233 if (ret < 0)
234 printk(KERN_DEBUG "Playback DMA start failed\n");
235 }
236 }
237
238 /* Enable transmitter or receiver */
239 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
240 spcr |= mask;
241
242 if (dev->pcr & (DAVINCI_MCBSP_PCR_FSXM | DAVINCI_MCBSP_PCR_FSRM)) {
243 /* Start frame sync */
244 spcr |= DAVINCI_MCBSP_SPCR_FRST;
245 }
246 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
247}
248
249static void davinci_mcbsp_stop(struct davinci_mcbsp_dev *dev, int playback)
250{
251 u32 spcr;
252
253 /* Reset transmitter/receiver and sample rate/frame sync generators */
254 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
255 spcr &= ~(DAVINCI_MCBSP_SPCR_GRST | DAVINCI_MCBSP_SPCR_FRST);
256 spcr &= playback ? ~DAVINCI_MCBSP_SPCR_XRST : ~DAVINCI_MCBSP_SPCR_RRST;
257 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
258 toggle_clock(dev, playback);
259}
260
261#define DEFAULT_BITPERSAMPLE 16
262
263static int davinci_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
264 unsigned int fmt)
265{
266 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
267 unsigned int pcr;
268 unsigned int srgr;
269 bool inv_fs = false;
270 /* Attention srgr is updated by hw_params! */
271 srgr = DAVINCI_MCBSP_SRGR_FSGM |
272 DAVINCI_MCBSP_SRGR_FPER(DEFAULT_BITPERSAMPLE * 2 - 1) |
273 DAVINCI_MCBSP_SRGR_FWID(DEFAULT_BITPERSAMPLE - 1);
274
275 dev->fmt = fmt;
276 /* set master/slave audio interface */
277 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
278 case SND_SOC_DAIFMT_CBS_CFS:
279 /* cpu is master */
280 pcr = DAVINCI_MCBSP_PCR_FSXM |
281 DAVINCI_MCBSP_PCR_FSRM |
282 DAVINCI_MCBSP_PCR_CLKXM |
283 DAVINCI_MCBSP_PCR_CLKRM;
284 break;
285 case SND_SOC_DAIFMT_CBM_CFS:
286 pcr = DAVINCI_MCBSP_PCR_FSRM | DAVINCI_MCBSP_PCR_FSXM;
287 /*
288 * Selection of the clock input pin that is the
289 * input for the Sample Rate Generator.
290 * McBSP FSR and FSX are driven by the Sample Rate
291 * Generator.
292 */
293 switch (dev->clk_input_pin) {
294 case MCBSP_CLKS:
295 pcr |= DAVINCI_MCBSP_PCR_CLKXM |
296 DAVINCI_MCBSP_PCR_CLKRM;
297 break;
298 case MCBSP_CLKR:
299 pcr |= DAVINCI_MCBSP_PCR_SCLKME;
300 break;
301 default:
302 dev_err(dev->dev, "bad clk_input_pin\n");
303 return -EINVAL;
304 }
305
306 break;
307 case SND_SOC_DAIFMT_CBM_CFM:
308 /* codec is master */
309 pcr = 0;
310 break;
311 default:
312 printk(KERN_ERR "%s:bad master\n", __func__);
313 return -EINVAL;
314 }
315
316 /* interface format */
317 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
318 case SND_SOC_DAIFMT_I2S:
319 /* Davinci doesn't support TRUE I2S, but some codecs will have
320 * the left and right channels contiguous. This allows
321 * dsp_a mode to be used with an inverted normal frame clk.
322 * If your codec is master and does not have contiguous
323 * channels, then you will have sound on only one channel.
324 * Try using a different mode, or codec as slave.
325 *
326 * The TLV320AIC33 is an example of a codec where this works.
327 * It has a variable bit clock frequency allowing it to have
328 * valid data on every bit clock.
329 *
330 * The TLV320AIC23 is an example of a codec where this does not
331 * work. It has a fixed bit clock frequency with progressively
332 * more empty bit clock slots between channels as the sample
333 * rate is lowered.
334 */
335 inv_fs = true;
336 case SND_SOC_DAIFMT_DSP_A:
337 dev->mode = MOD_DSP_A;
338 break;
339 case SND_SOC_DAIFMT_DSP_B:
340 dev->mode = MOD_DSP_B;
341 break;
342 default:
343 printk(KERN_ERR "%s:bad format\n", __func__);
344 return -EINVAL;
345 }
346
347 switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
348 case SND_SOC_DAIFMT_NB_NF:
349 /* CLKRP Receive clock polarity,
350 * 1 - sampled on rising edge of CLKR
351 * valid on rising edge
352 * CLKXP Transmit clock polarity,
353 * 1 - clocked on falling edge of CLKX
354 * valid on rising edge
355 * FSRP Receive frame sync pol, 0 - active high
356 * FSXP Transmit frame sync pol, 0 - active high
357 */
358 pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP);
359 break;
360 case SND_SOC_DAIFMT_IB_IF:
361 /* CLKRP Receive clock polarity,
362 * 0 - sampled on falling edge of CLKR
363 * valid on falling edge
364 * CLKXP Transmit clock polarity,
365 * 0 - clocked on rising edge of CLKX
366 * valid on falling edge
367 * FSRP Receive frame sync pol, 1 - active low
368 * FSXP Transmit frame sync pol, 1 - active low
369 */
370 pcr |= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
371 break;
372 case SND_SOC_DAIFMT_NB_IF:
373 /* CLKRP Receive clock polarity,
374 * 1 - sampled on rising edge of CLKR
375 * valid on rising edge
376 * CLKXP Transmit clock polarity,
377 * 1 - clocked on falling edge of CLKX
378 * valid on rising edge
379 * FSRP Receive frame sync pol, 1 - active low
380 * FSXP Transmit frame sync pol, 1 - active low
381 */
382 pcr |= (DAVINCI_MCBSP_PCR_CLKXP | DAVINCI_MCBSP_PCR_CLKRP |
383 DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
384 break;
385 case SND_SOC_DAIFMT_IB_NF:
386 /* CLKRP Receive clock polarity,
387 * 0 - sampled on falling edge of CLKR
388 * valid on falling edge
389 * CLKXP Transmit clock polarity,
390 * 0 - clocked on rising edge of CLKX
391 * valid on falling edge
392 * FSRP Receive frame sync pol, 0 - active high
393 * FSXP Transmit frame sync pol, 0 - active high
394 */
395 break;
396 default:
397 return -EINVAL;
398 }
399 if (inv_fs == true)
400 pcr ^= (DAVINCI_MCBSP_PCR_FSXP | DAVINCI_MCBSP_PCR_FSRP);
401 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
402 dev->pcr = pcr;
403 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_PCR_REG, pcr);
404 return 0;
405}
406
407static int davinci_i2s_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
408 int div_id, int div)
409{
410 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(cpu_dai);
411
412 if (div_id != DAVINCI_MCBSP_CLKGDV)
413 return -ENODEV;
414
415 dev->clk_div = div;
416 return 0;
417}
418
419static int davinci_i2s_hw_params(struct snd_pcm_substream *substream,
420 struct snd_pcm_hw_params *params,
421 struct snd_soc_dai *dai)
422{
423 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
424 struct snd_interval *i = NULL;
425 int mcbsp_word_length, master;
426 unsigned int rcr, xcr, srgr, clk_div, freq, framesize;
427 u32 spcr;
428 snd_pcm_format_t fmt;
429 unsigned element_cnt = 1;
430
431 /* general line settings */
432 spcr = davinci_mcbsp_read_reg(dev, DAVINCI_MCBSP_SPCR_REG);
433 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
434 spcr |= DAVINCI_MCBSP_SPCR_RINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
435 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
436 } else {
437 spcr |= DAVINCI_MCBSP_SPCR_XINTM(3) | DAVINCI_MCBSP_SPCR_FREE;
438 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SPCR_REG, spcr);
439 }
440
441 master = dev->fmt & SND_SOC_DAIFMT_MASTER_MASK;
442 fmt = params_format(params);
443 mcbsp_word_length = asp_word_length[fmt];
444
445 switch (master) {
446 case SND_SOC_DAIFMT_CBS_CFS:
447 freq = clk_get_rate(dev->clk);
448 srgr = DAVINCI_MCBSP_SRGR_FSGM |
449 DAVINCI_MCBSP_SRGR_CLKSM;
450 srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length *
451 8 - 1);
452 if (dev->i2s_accurate_sck) {
453 clk_div = 256;
454 do {
455 framesize = (freq / (--clk_div)) /
456 params->rate_num *
457 params->rate_den;
458 } while (((framesize < 33) || (framesize > 4095)) &&
459 (clk_div));
460 clk_div--;
461 srgr |= DAVINCI_MCBSP_SRGR_FPER(framesize - 1);
462 } else {
463 /* symmetric waveforms */
464 clk_div = freq / (mcbsp_word_length * 16) /
465 params->rate_num * params->rate_den;
466 srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
467 16 - 1);
468 }
469 clk_div &= 0xFF;
470 srgr |= clk_div;
471 break;
472 case SND_SOC_DAIFMT_CBM_CFS:
473 srgr = DAVINCI_MCBSP_SRGR_FSGM;
474 clk_div = dev->clk_div - 1;
475 srgr |= DAVINCI_MCBSP_SRGR_FWID(mcbsp_word_length * 8 - 1);
476 srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length * 16 - 1);
477 clk_div &= 0xFF;
478 srgr |= clk_div;
479 break;
480 case SND_SOC_DAIFMT_CBM_CFM:
481 /* Clock and frame sync given from external sources */
482 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
483 srgr = DAVINCI_MCBSP_SRGR_FSGM;
484 srgr |= DAVINCI_MCBSP_SRGR_FWID(snd_interval_value(i) - 1);
485 pr_debug("%s - %d FWID set: re-read srgr = %X\n",
486 __func__, __LINE__, snd_interval_value(i) - 1);
487
488 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_FRAME_BITS);
489 srgr |= DAVINCI_MCBSP_SRGR_FPER(snd_interval_value(i) - 1);
490 break;
491 default:
492 return -EINVAL;
493 }
494 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_SRGR_REG, srgr);
495
496 rcr = DAVINCI_MCBSP_RCR_RFIG;
497 xcr = DAVINCI_MCBSP_XCR_XFIG;
498 if (dev->mode == MOD_DSP_B) {
499 rcr |= DAVINCI_MCBSP_RCR_RDATDLY(0);
500 xcr |= DAVINCI_MCBSP_XCR_XDATDLY(0);
501 } else {
502 rcr |= DAVINCI_MCBSP_RCR_RDATDLY(1);
503 xcr |= DAVINCI_MCBSP_XCR_XDATDLY(1);
504 }
505 /* Determine xfer data type */
506 fmt = params_format(params);
507 if ((fmt > SNDRV_PCM_FORMAT_S32_LE) || !data_type[fmt]) {
508 printk(KERN_WARNING "davinci-i2s: unsupported PCM format\n");
509 return -EINVAL;
510 }
511
512 if (params_channels(params) == 2) {
513 element_cnt = 2;
514 if (double_fmt[fmt] && dev->enable_channel_combine) {
515 element_cnt = 1;
516 fmt = double_fmt[fmt];
517 }
518 switch (master) {
519 case SND_SOC_DAIFMT_CBS_CFS:
520 case SND_SOC_DAIFMT_CBS_CFM:
521 rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(0);
522 xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(0);
523 rcr |= DAVINCI_MCBSP_RCR_RPHASE;
524 xcr |= DAVINCI_MCBSP_XCR_XPHASE;
525 break;
526 case SND_SOC_DAIFMT_CBM_CFM:
527 case SND_SOC_DAIFMT_CBM_CFS:
528 rcr |= DAVINCI_MCBSP_RCR_RFRLEN2(element_cnt - 1);
529 xcr |= DAVINCI_MCBSP_XCR_XFRLEN2(element_cnt - 1);
530 break;
531 default:
532 return -EINVAL;
533 }
534 }
535 mcbsp_word_length = asp_word_length[fmt];
536
537 switch (master) {
538 case SND_SOC_DAIFMT_CBS_CFS:
539 case SND_SOC_DAIFMT_CBS_CFM:
540 rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
541 xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
542 break;
543 case SND_SOC_DAIFMT_CBM_CFM:
544 case SND_SOC_DAIFMT_CBM_CFS:
545 rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(element_cnt - 1);
546 xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(element_cnt - 1);
547 break;
548 default:
549 return -EINVAL;
550 }
551
552 rcr |= DAVINCI_MCBSP_RCR_RWDLEN1(mcbsp_word_length) |
553 DAVINCI_MCBSP_RCR_RWDLEN2(mcbsp_word_length);
554 xcr |= DAVINCI_MCBSP_XCR_XWDLEN1(mcbsp_word_length) |
555 DAVINCI_MCBSP_XCR_XWDLEN2(mcbsp_word_length);
556
557 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
558 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_XCR_REG, xcr);
559 else
560 davinci_mcbsp_write_reg(dev, DAVINCI_MCBSP_RCR_REG, rcr);
561
562 pr_debug("%s - %d srgr=%X\n", __func__, __LINE__, srgr);
563 pr_debug("%s - %d xcr=%X\n", __func__, __LINE__, xcr);
564 pr_debug("%s - %d rcr=%X\n", __func__, __LINE__, rcr);
565 return 0;
566}
567
568static int davinci_i2s_prepare(struct snd_pcm_substream *substream,
569 struct snd_soc_dai *dai)
570{
571 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
572 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
573 davinci_mcbsp_stop(dev, playback);
574 return 0;
575}
576
577static int davinci_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
578 struct snd_soc_dai *dai)
579{
580 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
581 int ret = 0;
582 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
583
584 switch (cmd) {
585 case SNDRV_PCM_TRIGGER_START:
586 case SNDRV_PCM_TRIGGER_RESUME:
587 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
588 davinci_mcbsp_start(dev, substream);
589 break;
590 case SNDRV_PCM_TRIGGER_STOP:
591 case SNDRV_PCM_TRIGGER_SUSPEND:
592 case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
593 davinci_mcbsp_stop(dev, playback);
594 break;
595 default:
596 ret = -EINVAL;
597 }
598 return ret;
599}
600
601static void davinci_i2s_shutdown(struct snd_pcm_substream *substream,
602 struct snd_soc_dai *dai)
603{
604 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
605 int playback = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
606 davinci_mcbsp_stop(dev, playback);
607}
608
609#define DAVINCI_I2S_RATES SNDRV_PCM_RATE_8000_96000
610
611static const struct snd_soc_dai_ops davinci_i2s_dai_ops = {
612 .shutdown = davinci_i2s_shutdown,
613 .prepare = davinci_i2s_prepare,
614 .trigger = davinci_i2s_trigger,
615 .hw_params = davinci_i2s_hw_params,
616 .set_fmt = davinci_i2s_set_dai_fmt,
617 .set_clkdiv = davinci_i2s_dai_set_clkdiv,
618
619};
620
621static int davinci_i2s_dai_probe(struct snd_soc_dai *dai)
622{
623 struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
624
625 dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
626 dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
627
628 return 0;
629}
630
631static struct snd_soc_dai_driver davinci_i2s_dai = {
632 .probe = davinci_i2s_dai_probe,
633 .playback = {
634 .channels_min = 2,
635 .channels_max = 2,
636 .rates = DAVINCI_I2S_RATES,
637 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
638 .capture = {
639 .channels_min = 2,
640 .channels_max = 2,
641 .rates = DAVINCI_I2S_RATES,
642 .formats = SNDRV_PCM_FMTBIT_S16_LE,},
643 .ops = &davinci_i2s_dai_ops,
644
645};
646
647static const struct snd_soc_component_driver davinci_i2s_component = {
648 .name = "davinci-i2s",
649};
650
651static int davinci_i2s_probe(struct platform_device *pdev)
652{
653 struct davinci_mcbsp_dev *dev;
654 struct resource *mem, *res;
655 void __iomem *io_base;
656 int *dma;
657 int ret;
658
659 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
660 io_base = devm_ioremap_resource(&pdev->dev, mem);
661 if (IS_ERR(io_base))
662 return PTR_ERR(io_base);
663
664 dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_mcbsp_dev),
665 GFP_KERNEL);
666 if (!dev)
667 return -ENOMEM;
668
669 dev->clk = clk_get(&pdev->dev, NULL);
670 if (IS_ERR(dev->clk))
671 return -ENODEV;
672 clk_enable(dev->clk);
673
674 dev->base = io_base;
675
676 dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].addr =
677 (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
678
679 dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].addr =
680 (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
681
682 /* first TX, then RX */
683 res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
684 if (!res) {
685 dev_err(&pdev->dev, "no DMA resource\n");
686 ret = -ENXIO;
687 goto err_release_clk;
688 }
689 dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
690 *dma = res->start;
691 dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK].filter_data = dma;
692
693 res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
694 if (!res) {
695 dev_err(&pdev->dev, "no DMA resource\n");
696 ret = -ENXIO;
697 goto err_release_clk;
698 }
699 dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
700 *dma = res->start;
701 dev->dma_data[SNDRV_PCM_STREAM_CAPTURE].filter_data = dma;
702
703 dev->dev = &pdev->dev;
704 dev_set_drvdata(&pdev->dev, dev);
705
706 ret = snd_soc_register_component(&pdev->dev, &davinci_i2s_component,
707 &davinci_i2s_dai, 1);
708 if (ret != 0)
709 goto err_release_clk;
710
711 ret = edma_pcm_platform_register(&pdev->dev);
712 if (ret) {
713 dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
714 goto err_unregister_component;
715 }
716
717 return 0;
718
719err_unregister_component:
720 snd_soc_unregister_component(&pdev->dev);
721err_release_clk:
722 clk_disable(dev->clk);
723 clk_put(dev->clk);
724 return ret;
725}
726
727static int davinci_i2s_remove(struct platform_device *pdev)
728{
729 struct davinci_mcbsp_dev *dev = dev_get_drvdata(&pdev->dev);
730
731 snd_soc_unregister_component(&pdev->dev);
732
733 clk_disable(dev->clk);
734 clk_put(dev->clk);
735 dev->clk = NULL;
736
737 return 0;
738}
739
740static struct platform_driver davinci_mcbsp_driver = {
741 .probe = davinci_i2s_probe,
742 .remove = davinci_i2s_remove,
743 .driver = {
744 .name = "davinci-mcbsp",
745 },
746};
747
748module_platform_driver(davinci_mcbsp_driver);
749
750MODULE_AUTHOR("Vladimir Barinov");
751MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
752MODULE_LICENSE("GPL");