sound/soc/ti/davinci-i2s.c

   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
 102 enum {
 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
 111 static 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
 117 static 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
 123 static 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
 128 struct 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
 166 static 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
 172 static inline u32 davinci_mcbsp_read_reg(struct davinci_mcbsp_dev *dev, int reg)
 173 {
 174         return __raw_readl(dev->base + reg);
 175 }
 176
 177 static 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
 187 static 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
 205 static 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
 219 static 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_MASTER_MASK) {
 234         case SND_SOC_DAIFMT_CBS_CFS:
 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_CBM_CFS:
 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_CBM_CFM:
 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
 364 static 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
 376 static 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_MASTER_MASK;
 399         fmt = params_format(params);
 400         mcbsp_word_length = asp_word_length[fmt];
 401
 402         switch (master) {
 403         case SND_SOC_DAIFMT_CBS_CFS:
 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_CBM_CFS:
 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_CBM_CFM:
 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_CBS_CFS:
 477                 case SND_SOC_DAIFMT_CBS_CFM:
 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_CBM_CFM:
 484                 case SND_SOC_DAIFMT_CBM_CFS:
 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_CBS_CFS:
 496         case SND_SOC_DAIFMT_CBS_CFM:
 497                 rcr |= DAVINCI_MCBSP_RCR_RFRLEN1(0);
 498                 xcr |= DAVINCI_MCBSP_XCR_XFRLEN1(0);
 499                 break;
 500         case SND_SOC_DAIFMT_CBM_CFM:
 501         case SND_SOC_DAIFMT_CBM_CFS:
 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
 525 static 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
 568 static 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
 592 static 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
 604 static const struct snd_soc_dai_ops davinci_i2s_dai_ops = {
 605         .shutdown       = davinci_i2s_shutdown,
 606         .prepare        = davinci_i2s_prepare,
 607         .trigger        = davinci_i2s_trigger,
 608         .hw_params      = davinci_i2s_hw_params,
 609         .set_fmt        = davinci_i2s_set_dai_fmt,
 610         .set_clkdiv     = davinci_i2s_dai_set_clkdiv,
 611
 612 };
 613
 614 static int davinci_i2s_dai_probe(struct snd_soc_dai *dai)
 615 {
 616         struct davinci_mcbsp_dev *dev = snd_soc_dai_get_drvdata(dai);
 617
 618         dai->playback_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 619         dai->capture_dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
 620
 621         return 0;
 622 }
 623
 624 static struct snd_soc_dai_driver davinci_i2s_dai = {
 625         .probe = davinci_i2s_dai_probe,
 626         .playback = {
 627                 .channels_min = 2,
 628                 .channels_max = 2,
 629                 .rates = DAVINCI_I2S_RATES,
 630                 .formats = DAVINCI_I2S_FORMATS,
 631         },
 632         .capture = {
 633                 .channels_min = 2,
 634                 .channels_max = 2,
 635                 .rates = DAVINCI_I2S_RATES,
 636                 .formats = DAVINCI_I2S_FORMATS,
 637         },
 638         .ops = &davinci_i2s_dai_ops,
 639
 640 };
 641
 642 static const struct snd_soc_component_driver davinci_i2s_component = {
 643         .name           = DRV_NAME,
 644 };
 645
 646 static int davinci_i2s_probe(struct platform_device *pdev)
 647 {
 648         struct snd_dmaengine_dai_dma_data *dma_data;
 649         struct davinci_mcbsp_dev *dev;
 650         struct resource *mem, *res;
 651         void __iomem *io_base;
 652         int *dma;
 653         int ret;
 654
 655         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 656         if (!mem) {
 657                 dev_warn(&pdev->dev,
 658                          "\"mpu\" mem resource not found, using index 0\n");
 659                 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 660                 if (!mem) {
 661                         dev_err(&pdev->dev, "no mem resource?\n");
 662                         return -ENODEV;
 663                 }
 664         }
 665
 666         io_base = devm_ioremap_resource(&pdev->dev, mem);
 667         if (IS_ERR(io_base))
 668                 return PTR_ERR(io_base);
 669
 670         dev = devm_kzalloc(&pdev->dev, sizeof(struct davinci_mcbsp_dev),
 671                            GFP_KERNEL);
 672         if (!dev)
 673                 return -ENOMEM;
 674
 675         dev->base = io_base;
 676
 677         /* setup DMA, first TX, then RX */
 678         dma_data = &dev->dma_data[SNDRV_PCM_STREAM_PLAYBACK];
 679         dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DXR_REG);
 680
 681         res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
 682         if (res) {
 683                 dma = &dev->dma_request[SNDRV_PCM_STREAM_PLAYBACK];
 684                 *dma = res->start;
 685                 dma_data->filter_data = dma;
 686         } else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 687                 dma_data->filter_data = "tx";
 688         } else {
 689                 dev_err(&pdev->dev, "Missing DMA tx resource\n");
 690                 return -ENODEV;
 691         }
 692
 693         dma_data = &dev->dma_data[SNDRV_PCM_STREAM_CAPTURE];
 694         dma_data->addr = (dma_addr_t)(mem->start + DAVINCI_MCBSP_DRR_REG);
 695
 696         res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 697         if (res) {
 698                 dma = &dev->dma_request[SNDRV_PCM_STREAM_CAPTURE];
 699                 *dma = res->start;
 700                 dma_data->filter_data = dma;
 701         } else if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
 702                 dma_data->filter_data = "rx";
 703         } else {
 704                 dev_err(&pdev->dev, "Missing DMA rx resource\n");
 705                 return -ENODEV;
 706         }
 707
 708         dev->clk = clk_get(&pdev->dev, NULL);
 709         if (IS_ERR(dev->clk))
 710                 return -ENODEV;
 711         clk_enable(dev->clk);
 712
 713         dev->dev = &pdev->dev;
 714         dev_set_drvdata(&pdev->dev, dev);
 715
 716         ret = snd_soc_register_component(&pdev->dev, &davinci_i2s_component,
 717                                          &davinci_i2s_dai, 1);
 718         if (ret != 0)
 719                 goto err_release_clk;
 720
 721         ret = edma_pcm_platform_register(&pdev->dev);
 722         if (ret) {
 723                 dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
 724                 goto err_unregister_component;
 725         }
 726
 727         return 0;
 728
 729 err_unregister_component:
 730         snd_soc_unregister_component(&pdev->dev);
 731 err_release_clk:
 732         clk_disable(dev->clk);
 733         clk_put(dev->clk);
 734         return ret;
 735 }
 736
 737 static int davinci_i2s_remove(struct platform_device *pdev)
 738 {
 739         struct davinci_mcbsp_dev *dev = dev_get_drvdata(&pdev->dev);
 740
 741         snd_soc_unregister_component(&pdev->dev);
 742
 743         clk_disable(dev->clk);
 744         clk_put(dev->clk);
 745         dev->clk = NULL;
 746
 747         return 0;
 748 }
 749
 750 static const struct of_device_id davinci_i2s_match[] __maybe_unused = {
 751         { .compatible = "ti,da850-mcbsp" },
 752         {},
 753 };
 754 MODULE_DEVICE_TABLE(of, davinci_i2s_match);
 755
 756 static struct platform_driver davinci_mcbsp_driver = {
 757         .probe          = davinci_i2s_probe,
 758         .remove         = davinci_i2s_remove,
 759         .driver         = {
 760                 .name   = "davinci-mcbsp",
 761                 .of_match_table = of_match_ptr(davinci_i2s_match),
 762         },
 763 };
 764
 765 module_platform_driver(davinci_mcbsp_driver);
 766
 767 MODULE_AUTHOR("Vladimir Barinov");
 768 MODULE_DESCRIPTION("TI DAVINCI I2S (McBSP) SoC Interface");
 769 MODULE_LICENSE("GPL");