1/* sound/soc/samsung/spdif.c 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 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13#include <linux/clk.h> 14#include <linux/io.h> 15#include <linux/module.h> 16 17#include <sound/soc.h> 18#include <sound/pcm_params.h> 19 20#include <linux/platform_data/asoc-s3c.h> 21 22#include "dma.h" 23#include "spdif.h" 24 25/* Registers */ 26#define CLKCON 0x00 27#define CON 0x04 28#define BSTAS 0x08 29#define CSTAS 0x0C 30#define DATA_OUTBUF 0x10 31#define DCNT 0x14 32#define BSTAS_S 0x18 33#define DCNT_S 0x1C 34 35#define CLKCTL_MASK 0x7 36#define CLKCTL_MCLK_EXT (0x1 << 2) 37#define CLKCTL_PWR_ON (0x1 << 0) 38 39#define CON_MASK 0x3ffffff 40#define CON_FIFO_TH_SHIFT 19 41#define CON_FIFO_TH_MASK (0x7 << 19) 42#define CON_USERDATA_23RDBIT (0x1 << 12) 43 44#define CON_SW_RESET (0x1 << 5) 45 46#define CON_MCLKDIV_MASK (0x3 << 3) 47#define CON_MCLKDIV_256FS (0x0 << 3) 48#define CON_MCLKDIV_384FS (0x1 << 3) 49#define CON_MCLKDIV_512FS (0x2 << 3) 50 51#define CON_PCM_MASK (0x3 << 1) 52#define CON_PCM_16BIT (0x0 << 1) 53#define CON_PCM_20BIT (0x1 << 1) 54#define CON_PCM_24BIT (0x2 << 1) 55 56#define CON_PCM_DATA (0x1 << 0) 57 58#define CSTAS_MASK 0x3fffffff 59#define CSTAS_SAMP_FREQ_MASK (0xF << 24) 60#define CSTAS_SAMP_FREQ_44 (0x0 << 24) 61#define CSTAS_SAMP_FREQ_48 (0x2 << 24) 62#define CSTAS_SAMP_FREQ_32 (0x3 << 24) 63#define CSTAS_SAMP_FREQ_96 (0xA << 24) 64 65#define CSTAS_CATEGORY_MASK (0xFF << 8) 66#define CSTAS_CATEGORY_CODE_CDP (0x01 << 8) 67 68#define CSTAS_NO_COPYRIGHT (0x1 << 2) 69 70/** 71 * struct samsung_spdif_info - Samsung S/PDIF Controller information 72 * @lock: Spin lock for S/PDIF. 73 * @dev: The parent device passed to use from the probe. 74 * @regs: The pointer to the device register block. 75 * @clk_rate: Current clock rate for calcurate ratio. 76 * @pclk: The peri-clock pointer for spdif master operation. 77 * @sclk: The source clock pointer for making sync signals. 78 * @save_clkcon: Backup clkcon reg. in suspend. 79 * @save_con: Backup con reg. in suspend. 80 * @save_cstas: Backup cstas reg. in suspend. 81 * @dma_playback: DMA information for playback channel. 82 */ 83struct samsung_spdif_info { 84 spinlock_t lock; 85 struct device *dev; 86 void __iomem *regs; 87 unsigned long clk_rate; 88 struct clk *pclk; 89 struct clk *sclk; 90 u32 saved_clkcon; 91 u32 saved_con; 92 u32 saved_cstas; 93 struct s3c_dma_params *dma_playback; 94}; 95 96static struct s3c_dma_params spdif_stereo_out; 97static struct samsung_spdif_info spdif_info; 98 99static inline struct samsung_spdif_info *to_info(struct snd_soc_dai *cpu_dai) 100{ 101 return snd_soc_dai_get_drvdata(cpu_dai); 102} 103 104static void spdif_snd_txctrl(struct samsung_spdif_info *spdif, int on) 105{ 106 void __iomem *regs = spdif->regs; 107 u32 clkcon; 108 109 dev_dbg(spdif->dev, "Entered %s\n", __func__); 110 111 clkcon = readl(regs + CLKCON) & CLKCTL_MASK; 112 if (on) 113 writel(clkcon | CLKCTL_PWR_ON, regs + CLKCON); 114 else 115 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); 116} 117 118static int spdif_set_sysclk(struct snd_soc_dai *cpu_dai, 119 int clk_id, unsigned int freq, int dir) 120{ 121 struct samsung_spdif_info *spdif = to_info(cpu_dai); 122 u32 clkcon; 123 124 dev_dbg(spdif->dev, "Entered %s\n", __func__); 125 126 clkcon = readl(spdif->regs + CLKCON); 127 128 if (clk_id == SND_SOC_SPDIF_INT_MCLK) 129 clkcon &= ~CLKCTL_MCLK_EXT; 130 else 131 clkcon |= CLKCTL_MCLK_EXT; 132 133 writel(clkcon, spdif->regs + CLKCON); 134 135 spdif->clk_rate = freq; 136 137 return 0; 138} 139 140static int spdif_trigger(struct snd_pcm_substream *substream, int cmd, 141 struct snd_soc_dai *dai) 142{ 143 struct snd_soc_pcm_runtime *rtd = substream->private_data; 144 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai); 145 unsigned long flags; 146 147 dev_dbg(spdif->dev, "Entered %s\n", __func__); 148 149 switch (cmd) { 150 case SNDRV_PCM_TRIGGER_START: 151 case SNDRV_PCM_TRIGGER_RESUME: 152 case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: 153 spin_lock_irqsave(&spdif->lock, flags); 154 spdif_snd_txctrl(spdif, 1); 155 spin_unlock_irqrestore(&spdif->lock, flags); 156 break; 157 case SNDRV_PCM_TRIGGER_STOP: 158 case SNDRV_PCM_TRIGGER_SUSPEND: 159 case SNDRV_PCM_TRIGGER_PAUSE_PUSH: 160 spin_lock_irqsave(&spdif->lock, flags); 161 spdif_snd_txctrl(spdif, 0); 162 spin_unlock_irqrestore(&spdif->lock, flags); 163 break; 164 default: 165 return -EINVAL; 166 } 167 168 return 0; 169} 170 171static int spdif_sysclk_ratios[] = { 172 512, 384, 256, 173}; 174 175static int spdif_hw_params(struct snd_pcm_substream *substream, 176 struct snd_pcm_hw_params *params, 177 struct snd_soc_dai *socdai) 178{ 179 struct snd_soc_pcm_runtime *rtd = substream->private_data; 180 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai); 181 void __iomem *regs = spdif->regs; 182 struct s3c_dma_params *dma_data; 183 u32 con, clkcon, cstas; 184 unsigned long flags; 185 int i, ratio; 186 187 dev_dbg(spdif->dev, "Entered %s\n", __func__); 188 189 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 190 dma_data = spdif->dma_playback; 191 else { 192 dev_err(spdif->dev, "Capture is not supported\n"); 193 return -EINVAL; 194 } 195 196 snd_soc_dai_set_dma_data(rtd->cpu_dai, substream, dma_data); 197 198 spin_lock_irqsave(&spdif->lock, flags); 199 200 con = readl(regs + CON) & CON_MASK; 201 cstas = readl(regs + CSTAS) & CSTAS_MASK; 202 clkcon = readl(regs + CLKCON) & CLKCTL_MASK; 203 204 con &= ~CON_FIFO_TH_MASK; 205 con |= (0x7 << CON_FIFO_TH_SHIFT); 206 con |= CON_USERDATA_23RDBIT; 207 con |= CON_PCM_DATA; 208 209 con &= ~CON_PCM_MASK; 210 switch (params_width(params)) { 211 case 16: 212 con |= CON_PCM_16BIT; 213 break; 214 default: 215 dev_err(spdif->dev, "Unsupported data size.\n"); 216 goto err; 217 } 218 219 ratio = spdif->clk_rate / params_rate(params); 220 for (i = 0; i < ARRAY_SIZE(spdif_sysclk_ratios); i++) 221 if (ratio == spdif_sysclk_ratios[i]) 222 break; 223 if (i == ARRAY_SIZE(spdif_sysclk_ratios)) { 224 dev_err(spdif->dev, "Invalid clock ratio %ld/%d\n", 225 spdif->clk_rate, params_rate(params)); 226 goto err; 227 } 228 229 con &= ~CON_MCLKDIV_MASK; 230 switch (ratio) { 231 case 256: 232 con |= CON_MCLKDIV_256FS; 233 break; 234 case 384: 235 con |= CON_MCLKDIV_384FS; 236 break; 237 case 512: 238 con |= CON_MCLKDIV_512FS; 239 break; 240 } 241 242 cstas &= ~CSTAS_SAMP_FREQ_MASK; 243 switch (params_rate(params)) { 244 case 44100: 245 cstas |= CSTAS_SAMP_FREQ_44; 246 break; 247 case 48000: 248 cstas |= CSTAS_SAMP_FREQ_48; 249 break; 250 case 32000: 251 cstas |= CSTAS_SAMP_FREQ_32; 252 break; 253 case 96000: 254 cstas |= CSTAS_SAMP_FREQ_96; 255 break; 256 default: 257 dev_err(spdif->dev, "Invalid sampling rate %d\n", 258 params_rate(params)); 259 goto err; 260 } 261 262 cstas &= ~CSTAS_CATEGORY_MASK; 263 cstas |= CSTAS_CATEGORY_CODE_CDP; 264 cstas |= CSTAS_NO_COPYRIGHT; 265 266 writel(con, regs + CON); 267 writel(cstas, regs + CSTAS); 268 writel(clkcon, regs + CLKCON); 269 270 spin_unlock_irqrestore(&spdif->lock, flags); 271 272 return 0; 273err: 274 spin_unlock_irqrestore(&spdif->lock, flags); 275 return -EINVAL; 276} 277 278static void spdif_shutdown(struct snd_pcm_substream *substream, 279 struct snd_soc_dai *dai) 280{ 281 struct snd_soc_pcm_runtime *rtd = substream->private_data; 282 struct samsung_spdif_info *spdif = to_info(rtd->cpu_dai); 283 void __iomem *regs = spdif->regs; 284 u32 con, clkcon; 285 286 dev_dbg(spdif->dev, "Entered %s\n", __func__); 287 288 con = readl(regs + CON) & CON_MASK; 289 clkcon = readl(regs + CLKCON) & CLKCTL_MASK; 290 291 writel(con | CON_SW_RESET, regs + CON); 292 cpu_relax(); 293 294 writel(clkcon & ~CLKCTL_PWR_ON, regs + CLKCON); 295} 296 297#ifdef CONFIG_PM 298static int spdif_suspend(struct snd_soc_dai *cpu_dai) 299{ 300 struct samsung_spdif_info *spdif = to_info(cpu_dai); 301 u32 con = spdif->saved_con; 302 303 dev_dbg(spdif->dev, "Entered %s\n", __func__); 304 305 spdif->saved_clkcon = readl(spdif->regs + CLKCON) & CLKCTL_MASK; 306 spdif->saved_con = readl(spdif->regs + CON) & CON_MASK; 307 spdif->saved_cstas = readl(spdif->regs + CSTAS) & CSTAS_MASK; 308 309 writel(con | CON_SW_RESET, spdif->regs + CON); 310 cpu_relax(); 311 312 return 0; 313} 314 315static int spdif_resume(struct snd_soc_dai *cpu_dai) 316{ 317 struct samsung_spdif_info *spdif = to_info(cpu_dai); 318 319 dev_dbg(spdif->dev, "Entered %s\n", __func__); 320 321 writel(spdif->saved_clkcon, spdif->regs + CLKCON); 322 writel(spdif->saved_con, spdif->regs + CON); 323 writel(spdif->saved_cstas, spdif->regs + CSTAS); 324 325 return 0; 326} 327#else 328#define spdif_suspend NULL 329#define spdif_resume NULL 330#endif 331 332static const struct snd_soc_dai_ops spdif_dai_ops = { 333 .set_sysclk = spdif_set_sysclk, 334 .trigger = spdif_trigger, 335 .hw_params = spdif_hw_params, 336 .shutdown = spdif_shutdown, 337}; 338 339static struct snd_soc_dai_driver samsung_spdif_dai = { 340 .name = "samsung-spdif", 341 .playback = { 342 .stream_name = "S/PDIF Playback", 343 .channels_min = 2, 344 .channels_max = 2, 345 .rates = (SNDRV_PCM_RATE_32000 | 346 SNDRV_PCM_RATE_44100 | 347 SNDRV_PCM_RATE_48000 | 348 SNDRV_PCM_RATE_96000), 349 .formats = SNDRV_PCM_FMTBIT_S16_LE, }, 350 .ops = &spdif_dai_ops, 351 .suspend = spdif_suspend, 352 .resume = spdif_resume, 353}; 354 355static const struct snd_soc_component_driver samsung_spdif_component = { 356 .name = "samsung-spdif", 357}; 358 359static int spdif_probe(struct platform_device *pdev) 360{ 361 struct s3c_audio_pdata *spdif_pdata; 362 struct resource *mem_res, *dma_res; 363 struct samsung_spdif_info *spdif; 364 int ret; 365 366 spdif_pdata = pdev->dev.platform_data; 367 368 dev_dbg(&pdev->dev, "Entered %s\n", __func__); 369 370 dma_res = platform_get_resource(pdev, IORESOURCE_DMA, 0); 371 if (!dma_res) { 372 dev_err(&pdev->dev, "Unable to get dma resource.\n"); 373 return -ENXIO; 374 } 375 376 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 377 if (!mem_res) { 378 dev_err(&pdev->dev, "Unable to get register resource.\n"); 379 return -ENXIO; 380 } 381 382 if (spdif_pdata && spdif_pdata->cfg_gpio 383 && spdif_pdata->cfg_gpio(pdev)) { 384 dev_err(&pdev->dev, "Unable to configure GPIO pins\n"); 385 return -EINVAL; 386 } 387 388 spdif = &spdif_info; 389 spdif->dev = &pdev->dev; 390 391 spin_lock_init(&spdif->lock); 392 393 spdif->pclk = devm_clk_get(&pdev->dev, "spdif"); 394 if (IS_ERR(spdif->pclk)) { 395 dev_err(&pdev->dev, "failed to get peri-clock\n"); 396 ret = -ENOENT; 397 goto err0; 398 } 399 clk_prepare_enable(spdif->pclk); 400 401 spdif->sclk = devm_clk_get(&pdev->dev, "sclk_spdif"); 402 if (IS_ERR(spdif->sclk)) { 403 dev_err(&pdev->dev, "failed to get internal source clock\n"); 404 ret = -ENOENT; 405 goto err1; 406 } 407 clk_prepare_enable(spdif->sclk); 408 409 /* Request S/PDIF Register's memory region */ 410 if (!request_mem_region(mem_res->start, 411 resource_size(mem_res), "samsung-spdif")) { 412 dev_err(&pdev->dev, "Unable to request register region\n"); 413 ret = -EBUSY; 414 goto err2; 415 } 416 417 spdif->regs = ioremap(mem_res->start, 0x100); 418 if (spdif->regs == NULL) { 419 dev_err(&pdev->dev, "Cannot ioremap registers\n"); 420 ret = -ENXIO; 421 goto err3; 422 } 423 424 dev_set_drvdata(&pdev->dev, spdif); 425 426 ret = devm_snd_soc_register_component(&pdev->dev, 427 &samsung_spdif_component, &samsung_spdif_dai, 1); 428 if (ret != 0) { 429 dev_err(&pdev->dev, "fail to register dai\n"); 430 goto err4; 431 } 432 433 spdif_stereo_out.dma_size = 2; 434 spdif_stereo_out.dma_addr = mem_res->start + DATA_OUTBUF; 435 spdif_stereo_out.channel = dma_res->start; 436 437 spdif->dma_playback = &spdif_stereo_out; 438 439 ret = samsung_asoc_dma_platform_register(&pdev->dev); 440 if (ret) { 441 dev_err(&pdev->dev, "failed to register DMA: %d\n", ret); 442 goto err4; 443 } 444 445 return 0; 446err4: 447 iounmap(spdif->regs); 448err3: 449 release_mem_region(mem_res->start, resource_size(mem_res)); 450err2: 451 clk_disable_unprepare(spdif->sclk); 452err1: 453 clk_disable_unprepare(spdif->pclk); 454err0: 455 return ret; 456} 457 458static int spdif_remove(struct platform_device *pdev) 459{ 460 struct samsung_spdif_info *spdif = &spdif_info; 461 struct resource *mem_res; 462 463 iounmap(spdif->regs); 464 465 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 466 if (mem_res) 467 release_mem_region(mem_res->start, resource_size(mem_res)); 468 469 clk_disable_unprepare(spdif->sclk); 470 clk_disable_unprepare(spdif->pclk); 471 472 return 0; 473} 474 475static struct platform_driver samsung_spdif_driver = { 476 .probe = spdif_probe, 477 .remove = spdif_remove, 478 .driver = { 479 .name = "samsung-spdif", 480 }, 481}; 482 483module_platform_driver(samsung_spdif_driver); 484 485MODULE_AUTHOR("Seungwhan Youn, <sw.youn@samsung.com>"); 486MODULE_DESCRIPTION("Samsung S/PDIF Controller Driver"); 487MODULE_LICENSE("GPL"); 488MODULE_ALIAS("platform:samsung-spdif"); 489