1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // ALSA SoC Audio Layer - Samsung S/PDIF Controller driver 4 // 5 // Copyright (c) 2010 Samsung Electronics Co. Ltd 6 // http://www.samsung.com/ 7 8 #include <linux/clk.h> 9 #include <linux/io.h> 10 #include <linux/module.h> 11 12 #include <sound/soc.h> 13 #include <sound/pcm_params.h> 14 15 #include <linux/platform_data/asoc-s3c.h> 16 17 #include "dma.h" 18 #include "spdif.h" 19 20 /* Registers */ 21 #define CLKCON 0x00 22 #define CON 0x04 23 #define BSTAS 0x08 24 #define CSTAS 0x0C 25 #define DATA_OUTBUF 0x10 26 #define DCNT 0x14 27 #define BSTAS_S 0x18 28 #define DCNT_S 0x1C 29 30 #define CLKCTL_MASK 0x7 31 #define CLKCTL_MCLK_EXT (0x1 << 2) 32 #define CLKCTL_PWR_ON (0x1 << 0) 33 34 #define CON_MASK 0x3ffffff 35 #define CON_FIFO_TH_SHIFT 19 36 #define CON_FIFO_TH_MASK (0x7 << 19) 37 #define CON_USERDATA_23RDBIT (0x1 << 12) 38 39 #define CON_SW_RESET (0x1 << 5) 40 41 #define CON_MCLKDIV_MASK (0x3 << 3) 42 #define CON_MCLKDIV_256FS (0x0 << 3) 43 #define CON_MCLKDIV_384FS (0x1 << 3) 44 #define CON_MCLKDIV_512FS (0x2 << 3) 45 46 #define CON_PCM_MASK (0x3 << 1) 47 #define CON_PCM_16BIT (0x0 << 1) 48 #define CON_PCM_20BIT (0x1 << 1) 49 #define CON_PCM_24BIT (0x2 << 1) 50 51 #define CON_PCM_DATA (0x1 << 0) 52 53 #define CSTAS_MASK 0x3fffffff 54 #define CSTAS_SAMP_FREQ_MASK (0xF << 24) 55 #define CSTAS_SAMP_FREQ_44 (0x0 << 24) 56 #define CSTAS_SAMP_FREQ_48 (0x2 << 24) 57 #define CSTAS_SAMP_FREQ_32 (0x3 << 24) 58 #define CSTAS_SAMP_FREQ_96 (0xA << 24) 59 60 #define CSTAS_CATEGORY_MASK (0xFF << 8) 61 #define CSTAS_CATEGORY_CODE_CDP (0x01 << 8) 62 63 #define CSTAS_NO_COPYRIGHT (0x1 << 2) 64 65 /** 66 * struct samsung_spdif_info - Samsung S/PDIF Controller information 67 * @lock: Spin lock for S/PDIF. 68 * @dev: The parent device passed to use from the probe. 69 * @regs: The pointer to the device register block. 70 * @clk_rate: Current clock rate for calcurate ratio. 71 * @pclk: The peri-clock pointer for spdif master operation. 72 * @sclk: The source clock pointer for making sync signals. 73 * @saved_clkcon: Backup clkcon reg. in suspend. 74 * @saved_con: Backup con reg. in suspend. 75 * @saved_cstas: Backup cstas reg. in suspend. 76 * @dma_playback: DMA information for playback channel. 77 */ 78 struct samsung_spdif_info { 79 spinlock_t lock; 80 struct device *dev; 81 void __iomem *regs; 82 unsigned long clk_rate; 83 struct clk *pclk; 84 struct clk *sclk; 85 u32 saved_clkcon; 86 u32 saved_con; 87 u32 saved_cstas; 88 struct snd_dmaengine_dai_dma_data *dma_playback; 89 }; 90 91 static struct snd_dmaengine_dai_dma_data spdif_stereo_out; 92 static struct samsung_spdif_info spdif_info; 93 94 static inline struct samsung_spdif_info 95 *component_to_info(struct snd_soc_component *component) 96 { 97 return snd_soc_component_get_drvdata(component); 98 } 99 100 static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai) 101 { 102 return snd_soc_dai_get_drvdata(cpu_dai); 103 } 104 105 static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on) 106 { 107 void __iomem *regs = spdif->regs; 108 u32 clkcon; 109 110 dev_dbg(spdif->dev, "Entered %s\n", __func__); 111 112 clkcon = readl(regs + CLKCON) & CLKCTL_MASK; 113 if (on) 114 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON); 115 else 116 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); 117 } 118 119 static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai, 120 int clk_id, unsigned int freq, int dir) 121 { 122 struct samsung_spdif_info *spdif = to_info(cpu_dai); 123 u32 clkcon; 124 125 dev_dbg(spdif->dev, "Entered %s\n", __func__); 126 127 clkcon = readl(spdif->regs + CLKCON); 128 129 if (clk_id == SND_SOC_SPDIF_INT_MCLK) 130 clkcon &= ~CLKCTL_MCLK_EXT; 131 else 132 clkcon |= CLKCTL_MCLK_EXT; 133 134 writel(clkcon, spdif->regs + CLKCON); 135 136 spdif->clk_rate = freq; 137 138 return 0; 139 } 140 141 static int spdif_trigger(struct snd_pcm_substream *substream, int cmd, 142 struct snd_soc_dai *dai) 143 { 144 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 145 struct samsung_spdif_info *spdif = to_info(asoc_rtd_to_cpu(rtd, 0)); 146 unsigned long flags; 147 148 dev_dbg(spdif->dev, "Entered %s\n", __func__); 149 150 switch (cmd) { 151 case SNDRV_PCM_TRIGGER_START: 152 case SNDRV_PCM_TRIGGER_RESUME: 153 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 154 spin_lock_irqsave(&spdif->lock, flags); 155 spdif_snd_txctrl(spdif, 1); 156 spin_unlock_irqrestore(&spdif->lock, flags); 157 break; 158 case SNDRV_PCM_TRIGGER_STOP: 159 case SNDRV_PCM_TRIGGER_SUSPEND: 160 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 161 spin_lock_irqsave(&spdif->lock, flags); 162 spdif_snd_txctrl(spdif, 0); 163 spin_unlock_irqrestore(&spdif->lock, flags); 164 break; 165 default: 166 return -EINVAL; 167 } 168 169 return 0; 170 } 171 172 static int spdif_sysclk_ratios[] = { 173 512, 384, 256, 174 }; 175 176 static int spdif_hw_params(struct snd_pcm_substream *substream, 177 struct snd_pcm_hw_params *params, 178 struct snd_soc_dai *socdai) 179 { 180 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 181 struct samsung_spdif_info *spdif = to_info(asoc_rtd_to_cpu(rtd, 0)); 182 void __iomem *regs = spdif->regs; 183 struct snd_dmaengine_dai_dma_data *dma_data; 184 u32 con, clkcon, cstas; 185 unsigned long flags; 186 int i, ratio; 187 188 dev_dbg(spdif->dev, "Entered %s\n", __func__); 189 190 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 191 dma_data = spdif->dma_playback; 192 else { 193 dev_err(spdif->dev, "Capture is not supported\n"); 194 return -EINVAL; 195 } 196 197 snd_soc_dai_set_dma_data(asoc_rtd_to_cpu(rtd, 0), substream, dma_data); 198 199 spin_lock_irqsave(&spdif->lock, flags); 200 201 con = readl(regs + CON) & CON_MASK; 202 cstas = readl(regs + CSTAS) & CSTAS_MASK; 203 clkcon = readl(regs + CLKCON) & CLKCTL_MASK; 204 205 con &= ~CON_FIFO_TH_MASK; 206 con |= (0x7 << CON_FIFO_TH_SHIFT); 207 con |= CON_USERDATA_23RDBIT; 208 con |= CON_PCM_DATA; 209 210 con &= ~CON_PCM_MASK; 211 switch (params_width(params)) { 212 case 16: 213 con |= CON_PCM_16BIT; 214 break; 215 default: 216 dev_err(spdif->dev, "Unsupported data size.\n"); 217 goto err; 218 } 219 220 ratio = spdif->clk_rate / params_rate(params); 221 for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++) 222 if (ratio == spdif_sysclk_ratios[i]) 223 break; 224 if (i == ARRAY_SIZE(spdif_sysclk_ratios)) { 225 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n", 226 spdif->clk_rate, params_rate(params)); 227 goto err; 228 } 229 230 con &= ~CON_MCLKDIV_MASK; 231 switch (ratio) { 232 case 256: 233 con |= CON_MCLKDIV_256FS; 234 break; 235 case 384: 236 con |= CON_MCLKDIV_384FS; 237 break; 238 case 512: 239 con |= CON_MCLKDIV_512FS; 240 break; 241 } 242 243 cstas &= ~CSTAS_SAMP_FREQ_MASK; 244 switch (params_rate(params)) { 245 case 44100: 246 cstas |= CSTAS_SAMP_FREQ_44; 247 break; 248 case 48000: 249 cstas |= CSTAS_SAMP_FREQ_48; 250 break; 251 case 32000: 252 cstas |= CSTAS_SAMP_FREQ_32; 253 break; 254 case 96000: 255 cstas |= CSTAS_SAMP_FREQ_96; 256 break; 257 default: 258 dev_err(spdif->dev, "Invalid sampling rate %d\n", 259 params_rate(params)); 260 goto err; 261 } 262 263 cstas &= ~CSTAS_CATEGORY_MASK; 264 cstas |= CSTAS_CATEGORY_CODE_CDP; 265 cstas |= CSTAS_NO_COPYRIGHT; 266 267 writel(con, regs + CON); 268 writel(cstas, regs + CSTAS); 269 writel(clkcon, regs + CLKCON); 270 271 spin_unlock_irqrestore(&spdif->lock, flags); 272 273 return 0; 274 err: 275 spin_unlock_irqrestore(&spdif->lock, flags); 276 return -EINVAL; 277 } 278 279 static void spdif_shutdown(struct snd_pcm_substream *substream, 280 struct snd_soc_dai *dai) 281 { 282 struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream); 283 struct samsung_spdif_info *spdif = to_info(asoc_rtd_to_cpu(rtd, 0)); 284 void __iomem *regs = spdif->regs; 285 u32 con, clkcon; 286 287 dev_dbg(spdif->dev, "Entered %s\n", __func__); 288 289 con = readl(regs + CON) & CON_MASK; 290 clkcon = readl(regs + CLKCON) & CLKCTL_MASK; 291 292 writel(con | CON_SW_RESET, regs + CON); 293 cpu_relax(); 294 295 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); 296 } 297 298 #ifdef CONFIG_PM 299 static int spdif_suspend(struct snd_soc_component *component) 300 { 301 struct samsung_spdif_info *spdif = component_to_info(component); 302 u32 con = spdif->saved_con; 303 304 dev_dbg(spdif->dev, "Entered %s\n", __func__); 305 306 spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK; 307 spdif->saved_con = readl(spdif->regs + CON) & CON_MASK; 308 spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK; 309 310 writel(con | CON_SW_RESET, spdif->regs + CON); 311 cpu_relax(); 312 313 return 0; 314 } 315 316 static int spdif_resume(struct snd_soc_component *component) 317 { 318 struct samsung_spdif_info *spdif = component_to_info(component); 319 320 dev_dbg(spdif->dev, "Entered %s\n", __func__); 321 322 writel(spdif->saved_clkcon, spdif->regs + CLKCON); 323 writel(spdif->saved_con, spdif->regs + CON); 324 writel(spdif->saved_cstas, spdif->regs + CSTAS); 325 326 return 0; 327 } 328 #else 329 #define spdif_suspend NULL 330 #define spdif_resume NULL 331 #endif 332 333 static const struct snd_soc_dai_ops spdif_dai_ops = { 334 .set_sysclk = spdif_set_sysclk, 335 .trigger = spdif_trigger, 336 .hw_params = spdif_hw_params, 337 .shutdown = spdif_shutdown, 338 }; 339 340 static struct snd_soc_dai_driver samsung_spdif_dai = { 341 .name = "samsung-spdif", 342 .playback = { 343 .stream_name = "S/PDIF Playback", 344 .channels_min = 2, 345 .channels_max = 2, 346 .rates = (SNDRV_PCM_RATE_32000 | 347 SNDRV_PCM_RATE_44100 | 348 SNDRV_PCM_RATE_48000 | 349 SNDRV_PCM_RATE_96000), 350 .formats = SNDRV_PCM_FMTBIT_S16_LE, }, 351 .ops = &spdif_dai_ops, 352 }; 353 354 static const struct snd_soc_component_driver samsung_spdif_component = { 355 .name = "samsung-spdif", 356 .suspend = spdif_suspend, 357 .resume = spdif_resume, 358 .legacy_dai_naming = 1, 359 }; 360 361 static int spdif_probe(struct platform_device *pdev) 362 { 363 struct s3c_audio_pdata *spdif_pdata; 364 struct resource *mem_res; 365 struct samsung_spdif_info *spdif; 366 dma_filter_fn filter; 367 int ret; 368 369 spdif_pdata = pdev->dev.platform_data; 370 371 dev_dbg(&pdev->dev, "Entered %s\n", __func__); 372 373 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 374 if (!mem_res) { 375 dev_err(&pdev->dev, "Unable to get register resource.\n"); 376 return -ENXIO; 377 } 378 379 if (spdif_pdata && spdif_pdata->cfg_gpio 380 && spdif_pdata->cfg_gpio(pdev)) { 381 dev_err(&pdev->dev, "Unable to configure GPIO pins\n"); 382 return -EINVAL; 383 } 384 385 spdif = &spdif_info; 386 spdif->dev = &pdev->dev; 387 388 spin_lock_init(&spdif->lock); 389 390 spdif->pclk = devm_clk_get(&pdev->dev, "spdif"); 391 if (IS_ERR(spdif->pclk)) { 392 dev_err(&pdev->dev, "failed to get peri-clock\n"); 393 ret = -ENOENT; 394 goto err0; 395 } 396 ret = clk_prepare_enable(spdif->pclk); 397 if (ret) 398 goto err0; 399 400 spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif"); 401 if (IS_ERR(spdif->sclk)) { 402 dev_err(&pdev->dev, "failed to get internal source clock\n"); 403 ret = -ENOENT; 404 goto err1; 405 } 406 ret = clk_prepare_enable(spdif->sclk); 407 if (ret) 408 goto err1; 409 410 /* Request S/PDIF Register's memory region */ 411 if (!request_mem_region(mem_res->start, 412 resource_size(mem_res), "samsung-spdif")) { 413 dev_err(&pdev->dev, "Unable to request register region\n"); 414 ret = -EBUSY; 415 goto err2; 416 } 417 418 spdif->regs = ioremap(mem_res->start, 0x100); 419 if (spdif->regs == NULL) { 420 dev_err(&pdev->dev, "Cannot ioremap registers\n"); 421 ret = -ENXIO; 422 goto err3; 423 } 424 425 spdif_stereo_out.addr_width = 2; 426 spdif_stereo_out.addr = mem_res->start + DATA_OUTBUF; 427 filter = NULL; 428 if (spdif_pdata) { 429 spdif_stereo_out.filter_data = spdif_pdata->dma_playback; 430 filter = spdif_pdata->dma_filter; 431 } 432 spdif->dma_playback = &spdif_stereo_out; 433 434 ret = samsung_asoc_dma_platform_register(&pdev->dev, filter, 435 NULL, NULL, NULL); 436 if (ret) { 437 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret); 438 goto err4; 439 } 440 441 dev_set_drvdata(&pdev->dev, spdif); 442 443 ret = devm_snd_soc_register_component(&pdev->dev, 444 &samsung_spdif_component, &samsung_spdif_dai, 1); 445 if (ret != 0) { 446 dev_err(&pdev->dev, "fail to register dai\n"); 447 goto err4; 448 } 449 450 return 0; 451 err4: 452 iounmap(spdif->regs); 453 err3: 454 release_mem_region(mem_res->start, resource_size(mem_res)); 455 err2: 456 clk_disable_unprepare(spdif->sclk); 457 err1: 458 clk_disable_unprepare(spdif->pclk); 459 err0: 460 return ret; 461 } 462 463 static int spdif_remove(struct platform_device *pdev) 464 { 465 struct samsung_spdif_info *spdif = &spdif_info; 466 struct resource *mem_res; 467 468 iounmap(spdif->regs); 469 470 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 471 release_mem_region(mem_res->start, resource_size(mem_res)); 472 473 clk_disable_unprepare(spdif->sclk); 474 clk_disable_unprepare(spdif->pclk); 475 476 return 0; 477 } 478 479 static struct platform_driver samsung_spdif_driver = { 480 .probe = spdif_probe, 481 .remove = spdif_remove, 482 .driver = { 483 .name = "samsung-spdif", 484 }, 485 }; 486 487 module_platform_driver(samsung_spdif_driver); 488 489 MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>"); 490 MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver"); 491 MODULE_LICENSE("GPL"); 492 MODULE_ALIAS("platform:samsung-spdif"); 493