1 /* 2 * pxa-ssp.c -- ALSA Soc Audio Layer 3 * 4 * Copyright 2005,2008 Wolfson Microelectronics PLC. 5 * Author: Liam Girdwood 6 * Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 * 13 * TODO: 14 * o Test network mode for > 16bit sample size 15 */ 16 17 #include <linux/init.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/platform_device.h> 21 #include <linux/clk.h> 22 #include <linux/io.h> 23 #include <linux/pxa2xx_ssp.h> 24 #include <linux/of.h> 25 #include <linux/dmaengine.h> 26 27 #include <asm/irq.h> 28 29 #include <sound/core.h> 30 #include <sound/pcm.h> 31 #include <sound/initval.h> 32 #include <sound/pcm_params.h> 33 #include <sound/soc.h> 34 #include <sound/pxa2xx-lib.h> 35 #include <sound/dmaengine_pcm.h> 36 37 #include "../../arm/pxa2xx-pcm.h" 38 #include "pxa-ssp.h" 39 40 /* 41 * SSP audio private data 42 */ 43 struct ssp_priv { 44 struct ssp_device *ssp; 45 unsigned int sysclk; 46 int dai_fmt; 47 #ifdef CONFIG_PM 48 uint32_t cr0; 49 uint32_t cr1; 50 uint32_t to; 51 uint32_t psp; 52 #endif 53 }; 54 55 static void dump_registers(struct ssp_device *ssp) 56 { 57 dev_dbg(&ssp->pdev->dev, "SSCR0 0x%08x SSCR1 0x%08x SSTO 0x%08x\n", 58 pxa_ssp_read_reg(ssp, SSCR0), pxa_ssp_read_reg(ssp, SSCR1), 59 pxa_ssp_read_reg(ssp, SSTO)); 60 61 dev_dbg(&ssp->pdev->dev, "SSPSP 0x%08x SSSR 0x%08x SSACD 0x%08x\n", 62 pxa_ssp_read_reg(ssp, SSPSP), pxa_ssp_read_reg(ssp, SSSR), 63 pxa_ssp_read_reg(ssp, SSACD)); 64 } 65 66 static void pxa_ssp_enable(struct ssp_device *ssp) 67 { 68 uint32_t sscr0; 69 70 sscr0 = __raw_readl(ssp->mmio_base + SSCR0) | SSCR0_SSE; 71 __raw_writel(sscr0, ssp->mmio_base + SSCR0); 72 } 73 74 static void pxa_ssp_disable(struct ssp_device *ssp) 75 { 76 uint32_t sscr0; 77 78 sscr0 = __raw_readl(ssp->mmio_base + SSCR0) & ~SSCR0_SSE; 79 __raw_writel(sscr0, ssp->mmio_base + SSCR0); 80 } 81 82 static void pxa_ssp_set_dma_params(struct ssp_device *ssp, int width4, 83 int out, struct snd_dmaengine_dai_dma_data *dma) 84 { 85 dma->addr_width = width4 ? DMA_SLAVE_BUSWIDTH_4_BYTES : 86 DMA_SLAVE_BUSWIDTH_2_BYTES; 87 dma->maxburst = 16; 88 dma->addr = ssp->phys_base + SSDR; 89 } 90 91 static int pxa_ssp_startup(struct snd_pcm_substream *substream, 92 struct snd_soc_dai *cpu_dai) 93 { 94 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 95 struct ssp_device *ssp = priv->ssp; 96 struct snd_dmaengine_dai_dma_data *dma; 97 int ret = 0; 98 99 if (!cpu_dai->active) { 100 clk_prepare_enable(ssp->clk); 101 pxa_ssp_disable(ssp); 102 } 103 104 dma = kzalloc(sizeof(struct snd_dmaengine_dai_dma_data), GFP_KERNEL); 105 if (!dma) 106 return -ENOMEM; 107 108 dma->filter_data = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ? 109 &ssp->drcmr_tx : &ssp->drcmr_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 (!cpu_dai->active) { 123 pxa_ssp_disable(ssp); 124 clk_disable_unprepare(ssp->clk); 125 } 126 127 kfree(snd_soc_dai_get_dma_data(cpu_dai, substream)); 128 snd_soc_dai_set_dma_data(cpu_dai, substream, NULL); 129 } 130 131 #ifdef CONFIG_PM 132 133 static int pxa_ssp_suspend(struct snd_soc_dai *cpu_dai) 134 { 135 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 136 struct ssp_device *ssp = priv->ssp; 137 138 if (!cpu_dai->active) 139 clk_prepare_enable(ssp->clk); 140 141 priv->cr0 = __raw_readl(ssp->mmio_base + SSCR0); 142 priv->cr1 = __raw_readl(ssp->mmio_base + SSCR1); 143 priv->to = __raw_readl(ssp->mmio_base + SSTO); 144 priv->psp = __raw_readl(ssp->mmio_base + SSPSP); 145 146 pxa_ssp_disable(ssp); 147 clk_disable_unprepare(ssp->clk); 148 return 0; 149 } 150 151 static int pxa_ssp_resume(struct snd_soc_dai *cpu_dai) 152 { 153 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 154 struct ssp_device *ssp = priv->ssp; 155 uint32_t sssr = SSSR_ROR | SSSR_TUR | SSSR_BCE; 156 157 clk_prepare_enable(ssp->clk); 158 159 __raw_writel(sssr, ssp->mmio_base + SSSR); 160 __raw_writel(priv->cr0 & ~SSCR0_SSE, ssp->mmio_base + SSCR0); 161 __raw_writel(priv->cr1, ssp->mmio_base + SSCR1); 162 __raw_writel(priv->to, ssp->mmio_base + SSTO); 163 __raw_writel(priv->psp, ssp->mmio_base + SSPSP); 164 165 if (cpu_dai->active) 166 pxa_ssp_enable(ssp); 167 else 168 clk_disable_unprepare(ssp->clk); 169 170 return 0; 171 } 172 173 #else 174 #define pxa_ssp_suspend NULL 175 #define pxa_ssp_resume NULL 176 #endif 177 178 /** 179 * ssp_set_clkdiv - set SSP clock divider 180 * @div: serial clock rate divider 181 */ 182 static void pxa_ssp_set_scr(struct ssp_device *ssp, u32 div) 183 { 184 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 185 186 if (ssp->type == PXA25x_SSP) { 187 sscr0 &= ~0x0000ff00; 188 sscr0 |= ((div - 2)/2) << 8; /* 2..512 */ 189 } else { 190 sscr0 &= ~0x000fff00; 191 sscr0 |= (div - 1) << 8; /* 1..4096 */ 192 } 193 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 194 } 195 196 /** 197 * pxa_ssp_get_clkdiv - get SSP clock divider 198 */ 199 static u32 pxa_ssp_get_scr(struct ssp_device *ssp) 200 { 201 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 202 u32 div; 203 204 if (ssp->type == PXA25x_SSP) 205 div = ((sscr0 >> 8) & 0xff) * 2 + 2; 206 else 207 div = ((sscr0 >> 8) & 0xfff) + 1; 208 return div; 209 } 210 211 /* 212 * Set the SSP ports SYSCLK. 213 */ 214 static int pxa_ssp_set_dai_sysclk(struct snd_soc_dai *cpu_dai, 215 int clk_id, unsigned int freq, int dir) 216 { 217 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 218 struct ssp_device *ssp = priv->ssp; 219 int val; 220 221 u32 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & 222 ~(SSCR0_ECS | SSCR0_NCS | SSCR0_MOD | SSCR0_ACS); 223 224 dev_dbg(&ssp->pdev->dev, 225 "pxa_ssp_set_dai_sysclk id: %d, clk_id %d, freq %u\n", 226 cpu_dai->id, clk_id, freq); 227 228 switch (clk_id) { 229 case PXA_SSP_CLK_NET_PLL: 230 sscr0 |= SSCR0_MOD; 231 break; 232 case PXA_SSP_CLK_PLL: 233 /* Internal PLL is fixed */ 234 if (ssp->type == PXA25x_SSP) 235 priv->sysclk = 1843200; 236 else 237 priv->sysclk = 13000000; 238 break; 239 case PXA_SSP_CLK_EXT: 240 priv->sysclk = freq; 241 sscr0 |= SSCR0_ECS; 242 break; 243 case PXA_SSP_CLK_NET: 244 priv->sysclk = freq; 245 sscr0 |= SSCR0_NCS | SSCR0_MOD; 246 break; 247 case PXA_SSP_CLK_AUDIO: 248 priv->sysclk = 0; 249 pxa_ssp_set_scr(ssp, 1); 250 sscr0 |= SSCR0_ACS; 251 break; 252 default: 253 return -ENODEV; 254 } 255 256 /* The SSP clock must be disabled when changing SSP clock mode 257 * on PXA2xx. On PXA3xx it must be enabled when doing so. */ 258 if (ssp->type != PXA3xx_SSP) 259 clk_disable_unprepare(ssp->clk); 260 val = pxa_ssp_read_reg(ssp, SSCR0) | sscr0; 261 pxa_ssp_write_reg(ssp, SSCR0, val); 262 if (ssp->type != PXA3xx_SSP) 263 clk_prepare_enable(ssp->clk); 264 265 return 0; 266 } 267 268 /* 269 * Set the SSP clock dividers. 270 */ 271 static int pxa_ssp_set_dai_clkdiv(struct snd_soc_dai *cpu_dai, 272 int div_id, int div) 273 { 274 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 275 struct ssp_device *ssp = priv->ssp; 276 int val; 277 278 switch (div_id) { 279 case PXA_SSP_AUDIO_DIV_ACDS: 280 val = (pxa_ssp_read_reg(ssp, SSACD) & ~0x7) | SSACD_ACDS(div); 281 pxa_ssp_write_reg(ssp, SSACD, val); 282 break; 283 case PXA_SSP_AUDIO_DIV_SCDB: 284 val = pxa_ssp_read_reg(ssp, SSACD); 285 val &= ~SSACD_SCDB; 286 if (ssp->type == PXA3xx_SSP) 287 val &= ~SSACD_SCDX8; 288 switch (div) { 289 case PXA_SSP_CLK_SCDB_1: 290 val |= SSACD_SCDB; 291 break; 292 case PXA_SSP_CLK_SCDB_4: 293 break; 294 case PXA_SSP_CLK_SCDB_8: 295 if (ssp->type == PXA3xx_SSP) 296 val |= SSACD_SCDX8; 297 else 298 return -EINVAL; 299 break; 300 default: 301 return -EINVAL; 302 } 303 pxa_ssp_write_reg(ssp, SSACD, val); 304 break; 305 case PXA_SSP_DIV_SCR: 306 pxa_ssp_set_scr(ssp, div); 307 break; 308 default: 309 return -ENODEV; 310 } 311 312 return 0; 313 } 314 315 /* 316 * Configure the PLL frequency pxa27x and (afaik - pxa320 only) 317 */ 318 static int pxa_ssp_set_dai_pll(struct snd_soc_dai *cpu_dai, int pll_id, 319 int source, unsigned int freq_in, unsigned int freq_out) 320 { 321 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 322 struct ssp_device *ssp = priv->ssp; 323 u32 ssacd = pxa_ssp_read_reg(ssp, SSACD) & ~0x70; 324 325 if (ssp->type == PXA3xx_SSP) 326 pxa_ssp_write_reg(ssp, SSACDD, 0); 327 328 switch (freq_out) { 329 case 5622000: 330 break; 331 case 11345000: 332 ssacd |= (0x1 << 4); 333 break; 334 case 12235000: 335 ssacd |= (0x2 << 4); 336 break; 337 case 14857000: 338 ssacd |= (0x3 << 4); 339 break; 340 case 32842000: 341 ssacd |= (0x4 << 4); 342 break; 343 case 48000000: 344 ssacd |= (0x5 << 4); 345 break; 346 case 0: 347 /* Disable */ 348 break; 349 350 default: 351 /* PXA3xx has a clock ditherer which can be used to generate 352 * a wider range of frequencies - calculate a value for it. 353 */ 354 if (ssp->type == PXA3xx_SSP) { 355 u32 val; 356 u64 tmp = 19968; 357 tmp *= 1000000; 358 do_div(tmp, freq_out); 359 val = tmp; 360 361 val = (val << 16) | 64; 362 pxa_ssp_write_reg(ssp, SSACDD, val); 363 364 ssacd |= (0x6 << 4); 365 366 dev_dbg(&ssp->pdev->dev, 367 "Using SSACDD %x to supply %uHz\n", 368 val, freq_out); 369 break; 370 } 371 372 return -EINVAL; 373 } 374 375 pxa_ssp_write_reg(ssp, SSACD, ssacd); 376 377 return 0; 378 } 379 380 /* 381 * Set the active slots in TDM/Network mode 382 */ 383 static int pxa_ssp_set_dai_tdm_slot(struct snd_soc_dai *cpu_dai, 384 unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width) 385 { 386 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 387 struct ssp_device *ssp = priv->ssp; 388 u32 sscr0; 389 390 sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 391 sscr0 &= ~(SSCR0_MOD | SSCR0_SlotsPerFrm(8) | SSCR0_EDSS | SSCR0_DSS); 392 393 /* set slot width */ 394 if (slot_width > 16) 395 sscr0 |= SSCR0_EDSS | SSCR0_DataSize(slot_width - 16); 396 else 397 sscr0 |= SSCR0_DataSize(slot_width); 398 399 if (slots > 1) { 400 /* enable network mode */ 401 sscr0 |= SSCR0_MOD; 402 403 /* set number of active slots */ 404 sscr0 |= SSCR0_SlotsPerFrm(slots); 405 406 /* set active slot mask */ 407 pxa_ssp_write_reg(ssp, SSTSA, tx_mask); 408 pxa_ssp_write_reg(ssp, SSRSA, rx_mask); 409 } 410 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 411 412 return 0; 413 } 414 415 /* 416 * Tristate the SSP DAI lines 417 */ 418 static int pxa_ssp_set_dai_tristate(struct snd_soc_dai *cpu_dai, 419 int tristate) 420 { 421 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 422 struct ssp_device *ssp = priv->ssp; 423 u32 sscr1; 424 425 sscr1 = pxa_ssp_read_reg(ssp, SSCR1); 426 if (tristate) 427 sscr1 &= ~SSCR1_TTE; 428 else 429 sscr1 |= SSCR1_TTE; 430 pxa_ssp_write_reg(ssp, SSCR1, sscr1); 431 432 return 0; 433 } 434 435 /* 436 * Set up the SSP DAI format. 437 * The SSP Port must be inactive before calling this function as the 438 * physical interface format is changed. 439 */ 440 static int pxa_ssp_set_dai_fmt(struct snd_soc_dai *cpu_dai, 441 unsigned int fmt) 442 { 443 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 444 struct ssp_device *ssp = priv->ssp; 445 u32 sscr0, sscr1, sspsp, scfr; 446 447 /* check if we need to change anything at all */ 448 if (priv->dai_fmt == fmt) 449 return 0; 450 451 /* we can only change the settings if the port is not in use */ 452 if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) { 453 dev_err(&ssp->pdev->dev, 454 "can't change hardware dai format: stream is in use"); 455 return -EINVAL; 456 } 457 458 /* reset port settings */ 459 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & 460 ~(SSCR0_ECS | SSCR0_NCS | SSCR0_MOD | SSCR0_ACS); 461 sscr1 = SSCR1_RxTresh(8) | SSCR1_TxTresh(7); 462 sspsp = 0; 463 464 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 465 case SND_SOC_DAIFMT_CBM_CFM: 466 sscr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR | SSCR1_SCFR; 467 break; 468 case SND_SOC_DAIFMT_CBM_CFS: 469 sscr1 |= SSCR1_SCLKDIR | SSCR1_SCFR; 470 break; 471 case SND_SOC_DAIFMT_CBS_CFS: 472 break; 473 default: 474 return -EINVAL; 475 } 476 477 switch (fmt & SND_SOC_DAIFMT_INV_MASK) { 478 case SND_SOC_DAIFMT_NB_NF: 479 sspsp |= SSPSP_SFRMP; 480 break; 481 case SND_SOC_DAIFMT_NB_IF: 482 break; 483 case SND_SOC_DAIFMT_IB_IF: 484 sspsp |= SSPSP_SCMODE(2); 485 break; 486 case SND_SOC_DAIFMT_IB_NF: 487 sspsp |= SSPSP_SCMODE(2) | SSPSP_SFRMP; 488 break; 489 default: 490 return -EINVAL; 491 } 492 493 switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 494 case SND_SOC_DAIFMT_I2S: 495 sscr0 |= SSCR0_PSP; 496 sscr1 |= SSCR1_RWOT | SSCR1_TRAIL; 497 /* See hw_params() */ 498 break; 499 500 case SND_SOC_DAIFMT_DSP_A: 501 sspsp |= SSPSP_FSRT; 502 case SND_SOC_DAIFMT_DSP_B: 503 sscr0 |= SSCR0_MOD | SSCR0_PSP; 504 sscr1 |= SSCR1_TRAIL | SSCR1_RWOT; 505 break; 506 507 default: 508 return -EINVAL; 509 } 510 511 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 512 pxa_ssp_write_reg(ssp, SSCR1, sscr1); 513 pxa_ssp_write_reg(ssp, SSPSP, sspsp); 514 515 switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { 516 case SND_SOC_DAIFMT_CBM_CFM: 517 case SND_SOC_DAIFMT_CBM_CFS: 518 scfr = pxa_ssp_read_reg(ssp, SSCR1) | SSCR1_SCFR; 519 pxa_ssp_write_reg(ssp, SSCR1, scfr); 520 521 while (pxa_ssp_read_reg(ssp, SSSR) & SSSR_BSY) 522 cpu_relax(); 523 break; 524 } 525 526 dump_registers(ssp); 527 528 /* Since we are configuring the timings for the format by hand 529 * we have to defer some things until hw_params() where we 530 * know parameters like the sample size. 531 */ 532 priv->dai_fmt = fmt; 533 534 return 0; 535 } 536 537 /* 538 * Set the SSP audio DMA parameters and sample size. 539 * Can be called multiple times by oss emulation. 540 */ 541 static int pxa_ssp_hw_params(struct snd_pcm_substream *substream, 542 struct snd_pcm_hw_params *params, 543 struct snd_soc_dai *cpu_dai) 544 { 545 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 546 struct ssp_device *ssp = priv->ssp; 547 int chn = params_channels(params); 548 u32 sscr0; 549 u32 sspsp; 550 int width = snd_pcm_format_physical_width(params_format(params)); 551 int ttsa = pxa_ssp_read_reg(ssp, SSTSA) & 0xf; 552 struct snd_dmaengine_dai_dma_data *dma_data; 553 554 dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream); 555 556 /* Network mode with one active slot (ttsa == 1) can be used 557 * to force 16-bit frame width on the wire (for S16_LE), even 558 * with two channels. Use 16-bit DMA transfers for this case. 559 */ 560 pxa_ssp_set_dma_params(ssp, 561 ((chn == 2) && (ttsa != 1)) || (width == 32), 562 substream->stream == SNDRV_PCM_STREAM_PLAYBACK, dma_data); 563 564 /* we can only change the settings if the port is not in use */ 565 if (pxa_ssp_read_reg(ssp, SSCR0) & SSCR0_SSE) 566 return 0; 567 568 /* clear selected SSP bits */ 569 sscr0 = pxa_ssp_read_reg(ssp, SSCR0) & ~(SSCR0_DSS | SSCR0_EDSS); 570 571 /* bit size */ 572 switch (params_format(params)) { 573 case SNDRV_PCM_FORMAT_S16_LE: 574 if (ssp->type == PXA3xx_SSP) 575 sscr0 |= SSCR0_FPCKE; 576 sscr0 |= SSCR0_DataSize(16); 577 break; 578 case SNDRV_PCM_FORMAT_S24_LE: 579 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(8)); 580 break; 581 case SNDRV_PCM_FORMAT_S32_LE: 582 sscr0 |= (SSCR0_EDSS | SSCR0_DataSize(16)); 583 break; 584 } 585 pxa_ssp_write_reg(ssp, SSCR0, sscr0); 586 587 switch (priv->dai_fmt & SND_SOC_DAIFMT_FORMAT_MASK) { 588 case SND_SOC_DAIFMT_I2S: 589 sspsp = pxa_ssp_read_reg(ssp, SSPSP); 590 591 if ((pxa_ssp_get_scr(ssp) == 4) && (width == 16)) { 592 /* This is a special case where the bitclk is 64fs 593 * and we're not dealing with 2*32 bits of audio 594 * samples. 595 * 596 * The SSP values used for that are all found out by 597 * trying and failing a lot; some of the registers 598 * needed for that mode are only available on PXA3xx. 599 */ 600 if (ssp->type != PXA3xx_SSP) 601 return -EINVAL; 602 603 sspsp |= SSPSP_SFRMWDTH(width * 2); 604 sspsp |= SSPSP_SFRMDLY(width * 4); 605 sspsp |= SSPSP_EDMYSTOP(3); 606 sspsp |= SSPSP_DMYSTOP(3); 607 sspsp |= SSPSP_DMYSTRT(1); 608 } else { 609 /* The frame width is the width the LRCLK is 610 * asserted for; the delay is expressed in 611 * half cycle units. We need the extra cycle 612 * because the data starts clocking out one BCLK 613 * after LRCLK changes polarity. 614 */ 615 sspsp |= SSPSP_SFRMWDTH(width + 1); 616 sspsp |= SSPSP_SFRMDLY((width + 1) * 2); 617 sspsp |= SSPSP_DMYSTRT(1); 618 } 619 620 pxa_ssp_write_reg(ssp, SSPSP, sspsp); 621 break; 622 default: 623 break; 624 } 625 626 /* When we use a network mode, we always require TDM slots 627 * - complain loudly and fail if they've not been set up yet. 628 */ 629 if ((sscr0 & SSCR0_MOD) && !ttsa) { 630 dev_err(&ssp->pdev->dev, "No TDM timeslot configured\n"); 631 return -EINVAL; 632 } 633 634 dump_registers(ssp); 635 636 return 0; 637 } 638 639 static void pxa_ssp_set_running_bit(struct snd_pcm_substream *substream, 640 struct ssp_device *ssp, int value) 641 { 642 uint32_t sscr0 = pxa_ssp_read_reg(ssp, SSCR0); 643 uint32_t sscr1 = pxa_ssp_read_reg(ssp, SSCR1); 644 uint32_t sspsp = pxa_ssp_read_reg(ssp, SSPSP); 645 uint32_t sssr = pxa_ssp_read_reg(ssp, SSSR); 646 647 if (value && (sscr0 & SSCR0_SSE)) 648 pxa_ssp_write_reg(ssp, SSCR0, sscr0 & ~SSCR0_SSE); 649 650 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 651 if (value) 652 sscr1 |= SSCR1_TSRE; 653 else 654 sscr1 &= ~SSCR1_TSRE; 655 } else { 656 if (value) 657 sscr1 |= SSCR1_RSRE; 658 else 659 sscr1 &= ~SSCR1_RSRE; 660 } 661 662 pxa_ssp_write_reg(ssp, SSCR1, sscr1); 663 664 if (value) { 665 pxa_ssp_write_reg(ssp, SSSR, sssr); 666 pxa_ssp_write_reg(ssp, SSPSP, sspsp); 667 pxa_ssp_write_reg(ssp, SSCR0, sscr0 | SSCR0_SSE); 668 } 669 } 670 671 static int pxa_ssp_trigger(struct snd_pcm_substream *substream, int cmd, 672 struct snd_soc_dai *cpu_dai) 673 { 674 int ret = 0; 675 struct ssp_priv *priv = snd_soc_dai_get_drvdata(cpu_dai); 676 struct ssp_device *ssp = priv->ssp; 677 int val; 678 679 switch (cmd) { 680 case SNDRV_PCM_TRIGGER_RESUME: 681 pxa_ssp_enable(ssp); 682 break; 683 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 684 pxa_ssp_set_running_bit(substream, ssp, 1); 685 val = pxa_ssp_read_reg(ssp, SSSR); 686 pxa_ssp_write_reg(ssp, SSSR, val); 687 break; 688 case SNDRV_PCM_TRIGGER_START: 689 pxa_ssp_set_running_bit(substream, ssp, 1); 690 break; 691 case SNDRV_PCM_TRIGGER_STOP: 692 pxa_ssp_set_running_bit(substream, ssp, 0); 693 break; 694 case SNDRV_PCM_TRIGGER_SUSPEND: 695 pxa_ssp_disable(ssp); 696 break; 697 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 698 pxa_ssp_set_running_bit(substream, ssp, 0); 699 break; 700 701 default: 702 ret = -EINVAL; 703 } 704 705 dump_registers(ssp); 706 707 return ret; 708 } 709 710 static int pxa_ssp_probe(struct snd_soc_dai *dai) 711 { 712 struct device *dev = dai->dev; 713 struct ssp_priv *priv; 714 int ret; 715 716 priv = kzalloc(sizeof(struct ssp_priv), GFP_KERNEL); 717 if (!priv) 718 return -ENOMEM; 719 720 if (dev->of_node) { 721 struct device_node *ssp_handle; 722 723 ssp_handle = of_parse_phandle(dev->of_node, "port", 0); 724 if (!ssp_handle) { 725 dev_err(dev, "unable to get 'port' phandle\n"); 726 ret = -ENODEV; 727 goto err_priv; 728 } 729 730 priv->ssp = pxa_ssp_request_of(ssp_handle, "SoC audio"); 731 if (priv->ssp == NULL) { 732 ret = -ENODEV; 733 goto err_priv; 734 } 735 } else { 736 priv->ssp = pxa_ssp_request(dai->id + 1, "SoC audio"); 737 if (priv->ssp == NULL) { 738 ret = -ENODEV; 739 goto err_priv; 740 } 741 } 742 743 priv->dai_fmt = (unsigned int) -1; 744 snd_soc_dai_set_drvdata(dai, priv); 745 746 return 0; 747 748 err_priv: 749 kfree(priv); 750 return ret; 751 } 752 753 static int pxa_ssp_remove(struct snd_soc_dai *dai) 754 { 755 struct ssp_priv *priv = snd_soc_dai_get_drvdata(dai); 756 757 pxa_ssp_free(priv->ssp); 758 kfree(priv); 759 return 0; 760 } 761 762 #define PXA_SSP_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 |\ 763 SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \ 764 SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \ 765 SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_64000 | \ 766 SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000) 767 768 #define PXA_SSP_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE) 769 770 static const struct snd_soc_dai_ops pxa_ssp_dai_ops = { 771 .startup = pxa_ssp_startup, 772 .shutdown = pxa_ssp_shutdown, 773 .trigger = pxa_ssp_trigger, 774 .hw_params = pxa_ssp_hw_params, 775 .set_sysclk = pxa_ssp_set_dai_sysclk, 776 .set_clkdiv = pxa_ssp_set_dai_clkdiv, 777 .set_pll = pxa_ssp_set_dai_pll, 778 .set_fmt = pxa_ssp_set_dai_fmt, 779 .set_tdm_slot = pxa_ssp_set_dai_tdm_slot, 780 .set_tristate = pxa_ssp_set_dai_tristate, 781 }; 782 783 static struct snd_soc_dai_driver pxa_ssp_dai = { 784 .probe = pxa_ssp_probe, 785 .remove = pxa_ssp_remove, 786 .suspend = pxa_ssp_suspend, 787 .resume = pxa_ssp_resume, 788 .playback = { 789 .channels_min = 1, 790 .channels_max = 8, 791 .rates = PXA_SSP_RATES, 792 .formats = PXA_SSP_FORMATS, 793 }, 794 .capture = { 795 .channels_min = 1, 796 .channels_max = 8, 797 .rates = PXA_SSP_RATES, 798 .formats = PXA_SSP_FORMATS, 799 }, 800 .ops = &pxa_ssp_dai_ops, 801 }; 802 803 static const struct snd_soc_component_driver pxa_ssp_component = { 804 .name = "pxa-ssp", 805 }; 806 807 #ifdef CONFIG_OF 808 static const struct of_device_id pxa_ssp_of_ids[] = { 809 { .compatible = "mrvl,pxa-ssp-dai" }, 810 {} 811 }; 812 MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids); 813 #endif 814 815 static int asoc_ssp_probe(struct platform_device *pdev) 816 { 817 return devm_snd_soc_register_component(&pdev->dev, &pxa_ssp_component, 818 &pxa_ssp_dai, 1); 819 } 820 821 static struct platform_driver asoc_ssp_driver = { 822 .driver = { 823 .name = "pxa-ssp-dai", 824 .of_match_table = of_match_ptr(pxa_ssp_of_ids), 825 }, 826 827 .probe = asoc_ssp_probe, 828 }; 829 830 module_platform_driver(asoc_ssp_driver); 831 832 /* Module information */ 833 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); 834 MODULE_DESCRIPTION("PXA SSP/PCM SoC Interface"); 835 MODULE_LICENSE("GPL"); 836