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[] = { 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"); 770