1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * pxa-ssp.c -- ALSA Soc Audio Layer 4 * 5 * Copyright 2005,2008 Wolfson Microelectronics PLC. 6 * Author: Liam Girdwood 7 * Mark Brown <broonie@opensource.wolfsonmicro.com> 8 * 9 * TODO: 10 * o Test network mode for > 16bit sample size 11 */ 12 13 #include <linux/init.h> 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/platform_device.h> 17 #include <linux/clk.h> 18 #include <linux/io.h> 19 #include <linux/pxa2xx_ssp.h> 20 #include <linux/of.h> 21 #include <linux/dmaengine.h> 22 23 #include <asm/irq.h> 24 25 #include <sound/core.h> 26 #include <sound/pcm.h> 27 #include <sound/initval.h> 28 #include <sound/pcm_params.h> 29 #include <sound/soc.h> 30 #include <sound/pxa2xx-lib.h> 31 #include <sound/dmaengine_pcm.h> 32 33 #include "pxa-ssp.h" 34 35 /* 36 * SSP audio private data 37 */ 38 struct ssp_priv { 39 struct ssp_device *ssp; 40 struct clk *extclk; 41 unsigned long ssp_clk; 42 unsigned int sysclk; 43 unsigned int dai_fmt; 44 unsigned int configured_dai_fmt; 45 #ifdef CONFIG_PM 46 uint32_t cr0; 47 uint32_t cr1; 48 uint32_t to; 49 uint32_t psp; 50 #endif 51 }; 52 53 static void dump_registers(struct ssp_device *ssp) 54 { 55 dev_dbg(ssp->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n", 56 pxa_ssp_read_reg(ssp, SSCR0), pxa_ssp_read_reg(ssp, SSCR1), 57 pxa_ssp_read_reg(ssp, SSTO)); 58 59 dev_dbg(ssp->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n", 60 pxa_ssp_read_reg(ssp, SSPSP), pxa_ssp_read_reg(ssp, SSSR), 61 pxa_ssp_read_reg(ssp, SSACD)); 62 } 63 64 static void pxa_ssp_enable(struct ssp_device *ssp) 65 { 66 uint32_t sscr0; 67 68 sscr0 = __raw_readl(ssp->mmio_base + SSCR0) | SSCR0_SSE; 69 __raw_writel(sscr0, ssp->mmio_base + SSCR0); 70 } 71 72 static void pxa_ssp_disable(struct ssp_device *ssp) 73 { 74 uint32_t sscr0; 75 76 sscr0 = __raw_readl(ssp->mmio_base + SSCR0) & ~SSCR0_SSE; 77 __raw_writel(sscr0, ssp->mmio_base + SSCR0); 78 } 79 80 static void pxa_ssp_set_dma_params(struct ssp_device *ssp, int width4, 81 int out, struct snd_dmaengine_dai_dma_data *dma) 82 { 83 dma->addr_width = width4 ? DMA_SLAVE_BUSWIDTH_4_BYTES : 84 DMA_SLAVE_BUSWIDTH_2_BYTES; 85 dma->maxburst = 16; 86 dma->addr = ssp->phys_base + SSDR; 87 } 88 89 static int pxa_ssp_startup(struct snd_pcm_substream *substream, 90 struct snd_soc_dai *cpu_dai) 91 { 92 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 93 struct ssp_device *ssp = priv->ssp; 94 struct snd_dmaengine_dai_dma_data *dma; 95 int ret = 0; 96 97 if (!snd_soc_dai_active(cpu_dai)) { 98 clk_prepare_enable(ssp->clk); 99 pxa_ssp_disable(ssp); 100 } 101 102 if (priv->extclk) 103 clk_prepare_enable(priv->extclk); 104 105 dma = kzalloc(sizeof(struct snd_dmaengine_dai_dma_data), GFP_KERNEL); 106 if (!dma) 107 return -ENOMEM; 108 dma->chan_name = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 109 "tx" : "rx"; 110 111 snd_soc_dai_set_dma_data(cpu_dai, substream, dma); 112 113 return ret; 114 } 115 116 static void pxa_ssp_shutdown(struct snd_pcm_substream *substream, 117 struct snd_soc_dai *cpu_dai) 118 { 119 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 120 struct ssp_device *ssp = priv->ssp; 121 122 if (!snd_soc_dai_active(cpu_dai)) { 123 pxa_ssp_disable(ssp); 124 clk_disable_unprepare(ssp->clk); 125 } 126 127 if (priv->extclk) 128 clk_disable_unprepare(priv->extclk); 129 130 kfree(snd_soc_dai_get_dma_data(cpu_dai, substream)); 131 snd_soc_dai_set_dma_data(cpu_dai, substream, NULL); 132 } 133 134 #ifdef CONFIG_PM 135 136 static int pxa_ssp_suspend(struct snd_soc_component *component) 137 { 138 struct ssp_priv *priv = snd_soc_component_get_drvdata(component); 139 struct ssp_device *ssp = priv->ssp; 140 141 if (!snd_soc_component_active(component)) 142 clk_prepare_enable(ssp->clk); 143 144 priv->cr0 = __raw_readl(ssp->mmio_base + SSCR0); 145 priv->cr1 = __raw_readl(ssp->mmio_base + SSCR1); 146 priv->to = __raw_readl(ssp->mmio_base + SSTO); 147 priv->psp = __raw_readl(ssp->mmio_base + SSPSP); 148 149 pxa_ssp_disable(ssp); 150 clk_disable_unprepare(ssp->clk); 151 return 0; 152 } 153 154 static int pxa_ssp_resume(struct snd_soc_component *component) 155 { 156 struct ssp_priv *priv = snd_soc_component_get_drvdata(component); 157 struct ssp_device *ssp = priv->ssp; 158 uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE; 159 160 clk_prepare_enable(ssp->clk); 161 162 __raw_writel(sssr, ssp->mmio_base + SSSR); 163 __raw_writel(priv->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0); 164 __raw_writel(priv->cr1, ssp->mmio_base + SSCR1); 165 __raw_writel(priv->to, ssp->mmio_base + SSTO); 166 __raw_writel(priv->psp, ssp->mmio_base + SSPSP); 167 168 if (snd_soc_component_active(component)) 169 pxa_ssp_enable(ssp); 170 else 171 clk_disable_unprepare(ssp->clk); 172 173 return 0; 174 } 175 176 #else 177 #define pxa_ssp_suspend NULL 178 #define pxa_ssp_resume NULL 179 #endif 180 181 /** 182 * ssp_set_clkdiv - set SSP clock divider 183 * @div: serial clock rate divider 184 */ 185 static void pxa_ssp_set_scr(struct ssp_device *ssp, u32 div) 186 { 187 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 188 189 if (ssp->type == PXA25x_SSP) { 190 sscr0 &= ~0x0000ff00; 191 sscr0 |= ((div - 2)/2) << 8; /* 2..512 */ 192 } else { 193 sscr0 &= ~0x000fff00; 194 sscr0 |= (div - 1) << 8; /* 1..4096 */ 195 } 196 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 197 } 198 199 /* 200 * Set the SSP ports SYSCLK. 201 */ 202 static int pxa_ssp_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 203 int clk_id, unsigned int freq, int dir) 204 { 205 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 206 struct ssp_device *ssp = priv->ssp; 207 208 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & 209 ~(SSCR0_ECS | SSCR0_NCS | SSCR0_MOD | SSCR0_ACS); 210 211 if (priv->extclk) { 212 int ret; 213 214 /* 215 * For DT based boards, if an extclk is given, use it 216 * here and configure PXA_SSP_CLK_EXT. 217 */ 218 219 ret = clk_set_rate(priv->extclk, freq); 220 if (ret < 0) 221 return ret; 222 223 clk_id = PXA_SSP_CLK_EXT; 224 } 225 226 dev_dbg(ssp->dev, 227 "pxa_ssp_set_dai_sysclk id: %d, clk_id %d, freq %u\n", 228 cpu_dai->id, clk_id, freq); 229 230 switch (clk_id) { 231 case PXA_SSP_CLK_NET_PLL: 232 sscr0 |= SSCR0_MOD; 233 break; 234 case PXA_SSP_CLK_PLL: 235 /* Internal PLL is fixed */ 236 if (ssp->type == PXA25x_SSP) 237 priv->sysclk = 1843200; 238 else 239 priv->sysclk = 13000000; 240 break; 241 case PXA_SSP_CLK_EXT: 242 priv->sysclk = freq; 243 sscr0 |= SSCR0_ECS; 244 break; 245 case PXA_SSP_CLK_NET: 246 priv->sysclk = freq; 247 sscr0 |= SSCR0_NCS | SSCR0_MOD; 248 break; 249 case PXA_SSP_CLK_AUDIO: 250 priv->sysclk = 0; 251 pxa_ssp_set_scr(ssp, 1); 252 sscr0 |= SSCR0_ACS; 253 break; 254 default: 255 return -ENODEV; 256 } 257 258 /* The SSP clock must be disabled when changing SSP clock mode 259 * on PXA2xx. On PXA3xx it must be enabled when doing so. */ 260 if (ssp->type != PXA3xx_SSP) 261 clk_disable_unprepare(ssp->clk); 262 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 263 if (ssp->type != PXA3xx_SSP) 264 clk_prepare_enable(ssp->clk); 265 266 return 0; 267 } 268 269 /* 270 * Configure the PLL frequency pxa27x and (afaik - pxa320 only) 271 */ 272 static int pxa_ssp_set_pll(struct ssp_priv *priv, unsigned int freq) 273 { 274 struct ssp_device *ssp = priv->ssp; 275 u32 ssacd = pxa_ssp_read_reg(ssp, SSACD) & ~0x70; 276 277 if (ssp->type == PXA3xx_SSP) 278 pxa_ssp_write_reg(ssp, SSACDD, 0); 279 280 switch (freq) { 281 case 5622000: 282 break; 283 case 11345000: 284 ssacd |= (0x1 << 4); 285 break; 286 case 12235000: 287 ssacd |= (0x2 << 4); 288 break; 289 case 14857000: 290 ssacd |= (0x3 << 4); 291 break; 292 case 32842000: 293 ssacd |= (0x4 << 4); 294 break; 295 case 48000000: 296 ssacd |= (0x5 << 4); 297 break; 298 case 0: 299 /* Disable */ 300 break; 301 302 default: 303 /* PXA3xx has a clock ditherer which can be used to generate 304 * a wider range of frequencies - calculate a value for it. 305 */ 306 if (ssp->type == PXA3xx_SSP) { 307 u32 val; 308 u64 tmp = 19968; 309 310 tmp *= 1000000; 311 do_div(tmp, freq); 312 val = tmp; 313 314 val = (val << 16) | 64; 315 pxa_ssp_write_reg(ssp, SSACDD, val); 316 317 ssacd |= (0x6 << 4); 318 319 dev_dbg(ssp->dev, 320 "Using SSACDD %x to supply %uHz\n", 321 val, freq); 322 break; 323 } 324 325 return -EINVAL; 326 } 327 328 pxa_ssp_write_reg(ssp, SSACD, ssacd); 329 330 return 0; 331 } 332 333 /* 334 * Set the active slots in TDM/Network mode 335 */ 336 static int pxa_ssp_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, 337 unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width) 338 { 339 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 340 struct ssp_device *ssp = priv->ssp; 341 u32 sscr0; 342 343 sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 344 sscr0 &= ~(SSCR0_MOD | SSCR0_SlotsPerFrm(8) | SSCR0_EDSS | SSCR0_DSS); 345 346 /* set slot width */ 347 if (slot_width > 16) 348 sscr0 |= SSCR0_EDSS | SSCR0_DataSize(slot_width - 16); 349 else 350 sscr0 |= SSCR0_DataSize(slot_width); 351 352 if (slots > 1) { 353 /* enable network mode */ 354 sscr0 |= SSCR0_MOD; 355 356 /* set number of active slots */ 357 sscr0 |= SSCR0_SlotsPerFrm(slots); 358 359 /* set active slot mask */ 360 pxa_ssp_write_reg(ssp, SSTSA, tx_mask); 361 pxa_ssp_write_reg(ssp, SSRSA, rx_mask); 362 } 363 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 364 365 return 0; 366 } 367 368 /* 369 * Tristate the SSP DAI lines 370 */ 371 static int pxa_ssp_set_dai_tristate(struct snd_soc_dai *cpu_dai, 372 int tristate) 373 { 374 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 375 struct ssp_device *ssp = priv->ssp; 376 u32 sscr1; 377 378 sscr1 = pxa_ssp_read_reg(ssp, SSCR1); 379 if (tristate) 380 sscr1 &= ~SSCR1_TTE; 381 else 382 sscr1 |= SSCR1_TTE; 383 pxa_ssp_write_reg(ssp, SSCR1, sscr1); 384 385 return 0; 386 } 387 388 static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai, 389 unsigned int fmt) 390 { 391 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 392 393 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 394 case SND_SOC_DAIFMT_CBM_CFM: 395 case SND_SOC_DAIFMT_CBM_CFS: 396 case SND_SOC_DAIFMT_CBS_CFS: 397 break; 398 default: 399 return -EINVAL; 400 } 401 402 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 403 case SND_SOC_DAIFMT_NB_NF: 404 case SND_SOC_DAIFMT_NB_IF: 405 case SND_SOC_DAIFMT_IB_IF: 406 case SND_SOC_DAIFMT_IB_NF: 407 break; 408 default: 409 return -EINVAL; 410 } 411 412 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 413 case SND_SOC_DAIFMT_I2S: 414 case SND_SOC_DAIFMT_DSP_A: 415 case SND_SOC_DAIFMT_DSP_B: 416 break; 417 418 default: 419 return -EINVAL; 420 } 421 422 /* Settings will be applied in hw_params() */ 423 priv->dai_fmt = fmt; 424 425 return 0; 426 } 427 428 /* 429 * Set up the SSP DAI format. 430 * The SSP Port must be inactive before calling this function as the 431 * physical interface format is changed. 432 */ 433 static int pxa_ssp_configure_dai_fmt(struct ssp_priv *priv) 434 { 435 struct ssp_device *ssp = priv->ssp; 436 u32 sscr0, sscr1, sspsp, scfr; 437 438 /* check if we need to change anything at all */ 439 if (priv->configured_dai_fmt == priv->dai_fmt) 440 return 0; 441 442 /* reset port settings */ 443 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & 444 ~(SSCR0_PSP | SSCR0_MOD); 445 sscr1 = pxa_ssp_read_reg(ssp, SSCR1) & 446 ~(SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR | 447 SSCR1_RWOT | SSCR1_TRAIL | SSCR1_TFT | SSCR1_RFT); 448 sspsp = pxa_ssp_read_reg(ssp, SSPSP) & 449 ~(SSPSP_SFRMP | SSPSP_SCMODE(3)); 450 451 sscr1 |= SSCR1_RxTresh(8) | SSCR1_TxTresh(7); 452 453 switch (priv->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) { 454 case SND_SOC_DAIFMT_CBM_CFM: 455 sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR; 456 break; 457 case SND_SOC_DAIFMT_CBM_CFS: 458 sscr1 |= SSCR1_SCLKDIR | SSCR1_SCFR; 459 break; 460 case SND_SOC_DAIFMT_CBS_CFS: 461 break; 462 default: 463 return -EINVAL; 464 } 465 466 switch (priv->dai_fmt & SND_SOC_DAIFMT_INV_MASK) { 467 case SND_SOC_DAIFMT_NB_NF: 468 sspsp |= SSPSP_SFRMP; 469 break; 470 case SND_SOC_DAIFMT_NB_IF: 471 break; 472 case SND_SOC_DAIFMT_IB_IF: 473 sspsp |= SSPSP_SCMODE(2); 474 break; 475 case SND_SOC_DAIFMT_IB_NF: 476 sspsp |= SSPSP_SCMODE(2) | SSPSP_SFRMP; 477 break; 478 default: 479 return -EINVAL; 480 } 481 482 switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 483 case SND_SOC_DAIFMT_I2S: 484 sscr0 |= SSCR0_PSP; 485 sscr1 |= SSCR1_RWOT | SSCR1_TRAIL; 486 /* See hw_params() */ 487 break; 488 489 case SND_SOC_DAIFMT_DSP_A: 490 sspsp |= SSPSP_FSRT; 491 /* fall through */ 492 case SND_SOC_DAIFMT_DSP_B: 493 sscr0 |= SSCR0_MOD | SSCR0_PSP; 494 sscr1 |= SSCR1_TRAIL | SSCR1_RWOT; 495 break; 496 497 default: 498 return -EINVAL; 499 } 500 501 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 502 pxa_ssp_write_reg(ssp, SSCR1, sscr1); 503 pxa_ssp_write_reg(ssp, SSPSP, sspsp); 504 505 switch (priv->dai_fmt & SND_SOC_DAIFMT_MASTER_MASK) { 506 case SND_SOC_DAIFMT_CBM_CFM: 507 case SND_SOC_DAIFMT_CBM_CFS: 508 scfr = pxa_ssp_read_reg(ssp, SSCR1) | SSCR1_SCFR; 509 pxa_ssp_write_reg(ssp, SSCR1, scfr); 510 511 while (pxa_ssp_read_reg(ssp, SSSR) & SSSR_BSY) 512 cpu_relax(); 513 break; 514 } 515 516 dump_registers(ssp); 517 518 /* Since we are configuring the timings for the format by hand 519 * we have to defer some things until hw_params() where we 520 * know parameters like the sample size. 521 */ 522 priv->configured_dai_fmt = priv->dai_fmt; 523 524 return 0; 525 } 526 527 struct pxa_ssp_clock_mode { 528 int rate; 529 int pll; 530 u8 acds; 531 u8 scdb; 532 }; 533 534 static const struct pxa_ssp_clock_mode pxa_ssp_clock_modes[] = { 535 { .rate = 8000, .pll = 32842000, .acds = SSACD_ACDS_32, .scdb = SSACD_SCDB_4X }, 536 { .rate = 11025, .pll = 5622000, .acds = SSACD_ACDS_4, .scdb = SSACD_SCDB_4X }, 537 { .rate = 16000, .pll = 32842000, .acds = SSACD_ACDS_16, .scdb = SSACD_SCDB_4X }, 538 { .rate = 22050, .pll = 5622000, .acds = SSACD_ACDS_2, .scdb = SSACD_SCDB_4X }, 539 { .rate = 44100, .pll = 11345000, .acds = SSACD_ACDS_2, .scdb = SSACD_SCDB_4X }, 540 { .rate = 48000, .pll = 12235000, .acds = SSACD_ACDS_2, .scdb = SSACD_SCDB_4X }, 541 { .rate = 96000, .pll = 12235000, .acds = SSACD_ACDS_4, .scdb = SSACD_SCDB_1X }, 542 {} 543 }; 544 545 /* 546 * Set the SSP audio DMA parameters and sample size. 547 * Can be called multiple times by oss emulation. 548 */ 549 static int pxa_ssp_hw_params(struct snd_pcm_substream *substream, 550 struct snd_pcm_hw_params *params, 551 struct snd_soc_dai *cpu_dai) 552 { 553 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 554 struct ssp_device *ssp = priv->ssp; 555 int chn = params_channels(params); 556 u32 sscr0, sspsp; 557 int width = snd_pcm_format_physical_width(params_format(params)); 558 int ttsa = pxa_ssp_read_reg(ssp, SSTSA) & 0xf; 559 struct snd_dmaengine_dai_dma_data *dma_data; 560 int rate = params_rate(params); 561 int bclk = rate * chn * (width / 8); 562 int ret; 563 564 dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); 565 566 /* Network mode with one active slot (ttsa == 1) can be used 567 * to force 16-bit frame width on the wire (for S16_LE), even 568 * with two channels. Use 16-bit DMA transfers for this case. 569 */ 570 pxa_ssp_set_dma_params(ssp, 571 ((chn == 2) && (ttsa != 1)) || (width == 32), 572 substream->stream == SNDRV_PCM_STREAM_PLAYBACK, dma_data); 573 574 /* we can only change the settings if the port is not in use */ 575 if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) 576 return 0; 577 578 ret = pxa_ssp_configure_dai_fmt(priv); 579 if (ret < 0) 580 return ret; 581 582 /* clear selected SSP bits */ 583 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~(SSCR0_DSS | SSCR0_EDSS); 584 585 /* bit size */ 586 switch (params_format(params)) { 587 case SNDRV_PCM_FORMAT_S16_LE: 588 if (ssp->type == PXA3xx_SSP) 589 sscr0 |= SSCR0_FPCKE; 590 sscr0 |= SSCR0_DataSize(16); 591 break; 592 case SNDRV_PCM_FORMAT_S24_LE: 593 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(8)); 594 break; 595 case SNDRV_PCM_FORMAT_S32_LE: 596 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(16)); 597 break; 598 } 599 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 600 601 if (sscr0 & SSCR0_ACS) { 602 ret = pxa_ssp_set_pll(priv, bclk); 603 604 /* 605 * If we were able to generate the bclk directly, 606 * all is fine. Otherwise, look up the closest rate 607 * from the table and also set the dividers. 608 */ 609 610 if (ret < 0) { 611 const struct pxa_ssp_clock_mode *m; 612 int ssacd, acds; 613 614 for (m = pxa_ssp_clock_modes; m->rate; m++) { 615 if (m->rate == rate) 616 break; 617 } 618 619 if (!m->rate) 620 return -EINVAL; 621 622 acds = m->acds; 623 624 /* The values in the table are for 16 bits */ 625 if (width == 32) 626 acds--; 627 628 ret = pxa_ssp_set_pll(priv, bclk); 629 if (ret < 0) 630 return ret; 631 632 ssacd = pxa_ssp_read_reg(ssp, SSACD); 633 ssacd &= ~(SSACD_ACDS(7) | SSACD_SCDB_1X); 634 ssacd |= SSACD_ACDS(m->acds); 635 ssacd |= m->scdb; 636 pxa_ssp_write_reg(ssp, SSACD, ssacd); 637 } 638 } else if (sscr0 & SSCR0_ECS) { 639 /* 640 * For setups with external clocking, the PLL and its diviers 641 * are not active. Instead, the SCR bits in SSCR0 can be used 642 * to divide the clock. 643 */ 644 pxa_ssp_set_scr(ssp, bclk / rate); 645 } 646 647 switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 648 case SND_SOC_DAIFMT_I2S: 649 sspsp = pxa_ssp_read_reg(ssp, SSPSP); 650 651 if (((priv->sysclk / bclk) == 64) && (width == 16)) { 652 /* This is a special case where the bitclk is 64fs 653 * and we're not dealing with 2*32 bits of audio 654 * samples. 655 * 656 * The SSP values used for that are all found out by 657 * trying and failing a lot; some of the registers 658 * needed for that mode are only available on PXA3xx. 659 */ 660 if (ssp->type != PXA3xx_SSP) 661 return -EINVAL; 662 663 sspsp |= SSPSP_SFRMWDTH(width * 2); 664 sspsp |= SSPSP_SFRMDLY(width * 4); 665 sspsp |= SSPSP_EDMYSTOP(3); 666 sspsp |= SSPSP_DMYSTOP(3); 667 sspsp |= SSPSP_DMYSTRT(1); 668 } else { 669 /* The frame width is the width the LRCLK is 670 * asserted for; the delay is expressed in 671 * half cycle units. We need the extra cycle 672 * because the data starts clocking out one BCLK 673 * after LRCLK changes polarity. 674 */ 675 sspsp |= SSPSP_SFRMWDTH(width + 1); 676 sspsp |= SSPSP_SFRMDLY((width + 1) * 2); 677 sspsp |= SSPSP_DMYSTRT(1); 678 } 679 680 pxa_ssp_write_reg(ssp, SSPSP, sspsp); 681 break; 682 default: 683 break; 684 } 685 686 /* When we use a network mode, we always require TDM slots 687 * - complain loudly and fail if they've not been set up yet. 688 */ 689 if ((sscr0 & SSCR0_MOD) && !ttsa) { 690 dev_err(ssp->dev, "No TDM timeslot configured\n"); 691 return -EINVAL; 692 } 693 694 dump_registers(ssp); 695 696 return 0; 697 } 698 699 static void pxa_ssp_set_running_bit(struct snd_pcm_substream *substream, 700 struct ssp_device *ssp, int value) 701 { 702 uint32_t sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 703 uint32_t sscr1 = pxa_ssp_read_reg(ssp, SSCR1); 704 uint32_t sspsp = pxa_ssp_read_reg(ssp, SSPSP); 705 uint32_t sssr = pxa_ssp_read_reg(ssp, SSSR); 706 707 if (value && (sscr0 & SSCR0_SSE)) 708 pxa_ssp_write_reg(ssp, SSCR0, sscr0 & ~SSCR0_SSE); 709 710 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 711 if (value) 712 sscr1 |= SSCR1_TSRE; 713 else 714 sscr1 &= ~SSCR1_TSRE; 715 } else { 716 if (value) 717 sscr1 |= SSCR1_RSRE; 718 else 719 sscr1 &= ~SSCR1_RSRE; 720 } 721 722 pxa_ssp_write_reg(ssp, SSCR1, sscr1); 723 724 if (value) { 725 pxa_ssp_write_reg(ssp, SSSR, sssr); 726 pxa_ssp_write_reg(ssp, SSPSP, sspsp); 727 pxa_ssp_write_reg(ssp, SSCR0, sscr0 | SSCR0_SSE); 728 } 729 } 730 731 static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd, 732 struct snd_soc_dai *cpu_dai) 733 { 734 int ret = 0; 735 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 736 struct ssp_device *ssp = priv->ssp; 737 int val; 738 739 switch (cmd) { 740 case SNDRV_PCM_TRIGGER_RESUME: 741 pxa_ssp_enable(ssp); 742 break; 743 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 744 pxa_ssp_set_running_bit(substream, ssp, 1); 745 val = pxa_ssp_read_reg(ssp, SSSR); 746 pxa_ssp_write_reg(ssp, SSSR, val); 747 break; 748 case SNDRV_PCM_TRIGGER_START: 749 pxa_ssp_set_running_bit(substream, ssp, 1); 750 break; 751 case SNDRV_PCM_TRIGGER_STOP: 752 pxa_ssp_set_running_bit(substream, ssp, 0); 753 break; 754 case SNDRV_PCM_TRIGGER_SUSPEND: 755 pxa_ssp_disable(ssp); 756 break; 757 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 758 pxa_ssp_set_running_bit(substream, ssp, 0); 759 break; 760 761 default: 762 ret = -EINVAL; 763 } 764 765 dump_registers(ssp); 766 767 return ret; 768 } 769 770 static int pxa_ssp_probe(struct snd_soc_dai *dai) 771 { 772 struct device *dev = dai->dev; 773 struct ssp_priv *priv; 774 int ret; 775 776 priv = kzalloc(sizeof(struct ssp_priv), GFP_KERNEL); 777 if (!priv) 778 return -ENOMEM; 779 780 if (dev->of_node) { 781 struct device_node *ssp_handle; 782 783 ssp_handle = of_parse_phandle(dev->of_node, "port", 0); 784 if (!ssp_handle) { 785 dev_err(dev, "unable to get 'port' phandle\n"); 786 ret = -ENODEV; 787 goto err_priv; 788 } 789 790 priv->ssp = pxa_ssp_request_of(ssp_handle, "SoC audio"); 791 if (priv->ssp == NULL) { 792 ret = -ENODEV; 793 goto err_priv; 794 } 795 796 priv->extclk = devm_clk_get(dev, "extclk"); 797 if (IS_ERR(priv->extclk)) { 798 ret = PTR_ERR(priv->extclk); 799 if (ret == -EPROBE_DEFER) 800 return ret; 801 802 priv->extclk = NULL; 803 } 804 } else { 805 priv->ssp = pxa_ssp_request(dai->id + 1, "SoC audio"); 806 if (priv->ssp == NULL) { 807 ret = -ENODEV; 808 goto err_priv; 809 } 810 } 811 812 priv->dai_fmt = (unsigned int) -1; 813 snd_soc_dai_set_drvdata(dai, priv); 814 815 return 0; 816 817 err_priv: 818 kfree(priv); 819 return ret; 820 } 821 822 static int pxa_ssp_remove(struct snd_soc_dai *dai) 823 { 824 struct ssp_priv *priv = snd_soc_dai_get_drvdata(dai); 825 826 pxa_ssp_free(priv->ssp); 827 kfree(priv); 828 return 0; 829 } 830 831 #define PXA_SSP_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 832 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \ 833 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 834 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \ 835 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) 836 837 #define PXA_SSP_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE) 838 839 static const struct snd_soc_dai_ops pxa_ssp_dai_ops = { 840 .startup = pxa_ssp_startup, 841 .shutdown = pxa_ssp_shutdown, 842 .trigger = pxa_ssp_trigger, 843 .hw_params = pxa_ssp_hw_params, 844 .set_sysclk = pxa_ssp_set_dai_sysclk, 845 .set_fmt = pxa_ssp_set_dai_fmt, 846 .set_tdm_slot = pxa_ssp_set_dai_tdm_slot, 847 .set_tristate = pxa_ssp_set_dai_tristate, 848 }; 849 850 static struct snd_soc_dai_driver pxa_ssp_dai = { 851 .probe = pxa_ssp_probe, 852 .remove = pxa_ssp_remove, 853 .playback = { 854 .channels_min = 1, 855 .channels_max = 8, 856 .rates = PXA_SSP_RATES, 857 .formats = PXA_SSP_FORMATS, 858 }, 859 .capture = { 860 .channels_min = 1, 861 .channels_max = 8, 862 .rates = PXA_SSP_RATES, 863 .formats = PXA_SSP_FORMATS, 864 }, 865 .ops = &pxa_ssp_dai_ops, 866 }; 867 868 static const struct snd_soc_component_driver pxa_ssp_component = { 869 .name = "pxa-ssp", 870 .pcm_construct = pxa2xx_soc_pcm_new, 871 .pcm_destruct = pxa2xx_soc_pcm_free, 872 .open = pxa2xx_soc_pcm_open, 873 .close = pxa2xx_soc_pcm_close, 874 .hw_params = pxa2xx_soc_pcm_hw_params, 875 .hw_free = pxa2xx_soc_pcm_hw_free, 876 .prepare = pxa2xx_soc_pcm_prepare, 877 .trigger = pxa2xx_soc_pcm_trigger, 878 .pointer = pxa2xx_soc_pcm_pointer, 879 .mmap = pxa2xx_soc_pcm_mmap, 880 .suspend = pxa_ssp_suspend, 881 .resume = pxa_ssp_resume, 882 }; 883 884 #ifdef CONFIG_OF 885 static const struct of_device_id pxa_ssp_of_ids[] = { 886 { .compatible = "mrvl,pxa-ssp-dai" }, 887 {} 888 }; 889 MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids); 890 #endif 891 892 static int asoc_ssp_probe(struct platform_device *pdev) 893 { 894 return devm_snd_soc_register_component(&pdev->dev, &pxa_ssp_component, 895 &pxa_ssp_dai, 1); 896 } 897 898 static struct platform_driver asoc_ssp_driver = { 899 .driver = { 900 .name = "pxa-ssp-dai", 901 .of_match_table = of_match_ptr(pxa_ssp_of_ids), 902 }, 903 904 .probe = asoc_ssp_probe, 905 }; 906 907 module_platform_driver(asoc_ssp_driver); 908 909 /* Module information */ 910 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 911 MODULE_DESCRIPTION("PXA SSP/PCM SoC Interface"); 912 MODULE_LICENSE("GPL"); 913 MODULE_ALIAS("platform:pxa-ssp-dai"); 914