sound/soc/img/img-spdif-in.c

   1 /*
   2  * IMG SPDIF input controller driver
   3  *
   4  * Copyright (C) 2015 Imagination Technologies Ltd.
   5  *
   6  * Author: Damien Horsley <Damien.Horsley@imgtec.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms and conditions of the GNU General Public License,
  10  * version 2, as published by the Free Software Foundation.
  11  */
  12
  13 #include <linux/clk.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/reset.h>
  20
  21 #include <sound/core.h>
  22 #include <sound/dmaengine_pcm.h>
  23 #include <sound/initval.h>
  24 #include <sound/pcm.h>
  25 #include <sound/pcm_params.h>
  26 #include <sound/soc.h>
  27
  28 #define IMG_SPDIF_IN_RX_FIFO_OFFSET             0
  29
  30 #define IMG_SPDIF_IN_CTL                        0x4
  31 #define IMG_SPDIF_IN_CTL_LOCKLO_MASK            0xff
  32 #define IMG_SPDIF_IN_CTL_LOCKLO_SHIFT           0
  33 #define IMG_SPDIF_IN_CTL_LOCKHI_MASK            0xff00
  34 #define IMG_SPDIF_IN_CTL_LOCKHI_SHIFT           8
  35 #define IMG_SPDIF_IN_CTL_TRK_MASK               0xff0000
  36 #define IMG_SPDIF_IN_CTL_TRK_SHIFT              16
  37 #define IMG_SPDIF_IN_CTL_SRD_MASK               0x70000000
  38 #define IMG_SPDIF_IN_CTL_SRD_SHIFT              28
  39 #define IMG_SPDIF_IN_CTL_SRT_MASK               BIT(31)
  40
  41 #define IMG_SPDIF_IN_STATUS                     0x8
  42 #define IMG_SPDIF_IN_STATUS_SAM_MASK            0x7000
  43 #define IMG_SPDIF_IN_STATUS_SAM_SHIFT           12
  44 #define IMG_SPDIF_IN_STATUS_LOCK_MASK           BIT(15)
  45 #define IMG_SPDIF_IN_STATUS_LOCK_SHIFT          15
  46
  47 #define IMG_SPDIF_IN_CLKGEN                     0x1c
  48 #define IMG_SPDIF_IN_CLKGEN_NOM_MASK            0x3ff
  49 #define IMG_SPDIF_IN_CLKGEN_NOM_SHIFT           0
  50 #define IMG_SPDIF_IN_CLKGEN_HLD_MASK            0x3ff0000
  51 #define IMG_SPDIF_IN_CLKGEN_HLD_SHIFT           16
  52
  53 #define IMG_SPDIF_IN_CSL                        0x20
  54
  55 #define IMG_SPDIF_IN_CSH                        0x24
  56 #define IMG_SPDIF_IN_CSH_MASK                   0xff
  57 #define IMG_SPDIF_IN_CSH_SHIFT                  0
  58
  59 #define IMG_SPDIF_IN_SOFT_RESET                 0x28
  60 #define IMG_SPDIF_IN_SOFT_RESET_MASK            BIT(0)
  61
  62 #define IMG_SPDIF_IN_ACLKGEN_START              0x2c
  63 #define IMG_SPDIF_IN_ACLKGEN_NOM_MASK           0x3ff
  64 #define IMG_SPDIF_IN_ACLKGEN_NOM_SHIFT          0
  65 #define IMG_SPDIF_IN_ACLKGEN_HLD_MASK           0xffc00
  66 #define IMG_SPDIF_IN_ACLKGEN_HLD_SHIFT          10
  67 #define IMG_SPDIF_IN_ACLKGEN_TRK_MASK           0xff00000
  68 #define IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT          20
  69
  70 #define IMG_SPDIF_IN_NUM_ACLKGEN                4
  71
  72 struct img_spdif_in {
  73         spinlock_t lock;
  74         void __iomem *base;
  75         struct clk *clk_sys;
  76         struct snd_dmaengine_dai_dma_data dma_data;
  77         struct device *dev;
  78         unsigned int trk;
  79         bool multi_freq;
  80         int lock_acquire;
  81         int lock_release;
  82         unsigned int single_freq;
  83         unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];
  84         bool active;
  85
  86         /* Write-only registers */
  87         unsigned int aclkgen_regs[IMG_SPDIF_IN_NUM_ACLKGEN];
  88 };
  89
  90 static inline void img_spdif_in_writel(struct img_spdif_in *spdif,
  91                                         u32 val, u32 reg)
  92 {
  93         writel(val, spdif->base + reg);
  94 }
  95
  96 static inline u32 img_spdif_in_readl(struct img_spdif_in *spdif, u32 reg)
  97 {
  98         return readl(spdif->base + reg);
  99 }
 100
 101 static inline void img_spdif_in_aclkgen_writel(struct img_spdif_in *spdif,
 102                                                 u32 index)
 103 {
 104         img_spdif_in_writel(spdif, spdif->aclkgen_regs[index],
 105                         IMG_SPDIF_IN_ACLKGEN_START + (index * 0x4));
 106 }
 107
 108 static int img_spdif_in_check_max_rate(struct img_spdif_in *spdif,
 109                 unsigned int sample_rate, unsigned long *actual_freq)
 110 {
 111         unsigned long min_freq, freq_t;
 112
 113         /* Clock rate must be at least 24x the bit rate */
 114         min_freq = sample_rate * 2 * 32 * 24;
 115
 116         freq_t = clk_get_rate(spdif->clk_sys);
 117
 118         if (freq_t < min_freq)
 119                 return -EINVAL;
 120
 121         *actual_freq = freq_t;
 122
 123         return 0;
 124 }
 125
 126 static int img_spdif_in_do_clkgen_calc(unsigned int rate, unsigned int *pnom,
 127                 unsigned int *phld, unsigned long clk_rate)
 128 {
 129         unsigned int ori, nom, hld;
 130
 131         /*
 132          * Calculate oversampling ratio, nominal phase increment and hold
 133          * increment for the given rate / frequency
 134          */
 135
 136         if (!rate)
 137                 return -EINVAL;
 138
 139         ori = clk_rate / (rate * 64);
 140
 141         if (!ori)
 142                 return -EINVAL;
 143
 144         nom = (4096 / ori) + 1;
 145         do
 146                 hld = 4096 - (--nom * (ori - 1));
 147         while (hld < 120);
 148
 149         *pnom = nom;
 150         *phld = hld;
 151
 152         return 0;
 153 }
 154
 155 static int img_spdif_in_do_clkgen_single(struct img_spdif_in *spdif,
 156                 unsigned int rate)
 157 {
 158         unsigned int nom, hld;
 159         unsigned long flags, clk_rate;
 160         int ret = 0;
 161         u32 reg;
 162
 163         ret = img_spdif_in_check_max_rate(spdif, rate, &clk_rate);
 164         if (ret)
 165                 return ret;
 166
 167         ret = img_spdif_in_do_clkgen_calc(rate, &nom, &hld, clk_rate);
 168         if (ret)
 169                 return ret;
 170
 171         reg = (nom << IMG_SPDIF_IN_CLKGEN_NOM_SHIFT) &
 172                 IMG_SPDIF_IN_CLKGEN_NOM_MASK;
 173         reg |= (hld << IMG_SPDIF_IN_CLKGEN_HLD_SHIFT) &
 174                 IMG_SPDIF_IN_CLKGEN_HLD_MASK;
 175
 176         spin_lock_irqsave(&spdif->lock, flags);
 177
 178         if (spdif->active) {
 179                 spin_unlock_irqrestore(&spdif->lock, flags);
 180                 return -EBUSY;
 181         }
 182
 183         img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CLKGEN);
 184
 185         spdif->single_freq = rate;
 186
 187         spin_unlock_irqrestore(&spdif->lock, flags);
 188
 189         return 0;
 190 }
 191
 192 static int img_spdif_in_do_clkgen_multi(struct img_spdif_in *spdif,
 193                 unsigned int multi_freqs[])
 194 {
 195         unsigned int nom, hld, rate, max_rate = 0;
 196         unsigned long flags, clk_rate;
 197         int i, ret = 0;
 198         u32 reg, trk_reg, temp_regs[IMG_SPDIF_IN_NUM_ACLKGEN];
 199
 200         for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++)
 201                 if (multi_freqs[i] > max_rate)
 202                         max_rate = multi_freqs[i];
 203
 204         ret = img_spdif_in_check_max_rate(spdif, max_rate, &clk_rate);
 205         if (ret)
 206                 return ret;
 207
 208         for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
 209                 rate = multi_freqs[i];
 210
 211                 ret = img_spdif_in_do_clkgen_calc(rate, &nom, &hld, clk_rate);
 212                 if (ret)
 213                         return ret;
 214
 215                 reg = (nom << IMG_SPDIF_IN_ACLKGEN_NOM_SHIFT) &
 216                         IMG_SPDIF_IN_ACLKGEN_NOM_MASK;
 217                 reg |= (hld << IMG_SPDIF_IN_ACLKGEN_HLD_SHIFT) &
 218                         IMG_SPDIF_IN_ACLKGEN_HLD_MASK;
 219                 temp_regs[i] = reg;
 220         }
 221
 222         spin_lock_irqsave(&spdif->lock, flags);
 223
 224         if (spdif->active) {
 225                 spin_unlock_irqrestore(&spdif->lock, flags);
 226                 return -EBUSY;
 227         }
 228
 229         trk_reg = spdif->trk << IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT;
 230
 231         for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
 232                 spdif->aclkgen_regs[i] = temp_regs[i] | trk_reg;
 233                 img_spdif_in_aclkgen_writel(spdif, i);
 234         }
 235
 236         spdif->multi_freq = true;
 237         spdif->multi_freqs[0] = multi_freqs[0];
 238         spdif->multi_freqs[1] = multi_freqs[1];
 239         spdif->multi_freqs[2] = multi_freqs[2];
 240         spdif->multi_freqs[3] = multi_freqs[3];
 241
 242         spin_unlock_irqrestore(&spdif->lock, flags);
 243
 244         return 0;
 245 }
 246
 247 static int img_spdif_in_iec958_info(struct snd_kcontrol *kcontrol,
 248                 struct snd_ctl_elem_info *uinfo)
 249 {
 250         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 251         uinfo->count = 1;
 252
 253         return 0;
 254 }
 255
 256 static int img_spdif_in_get_status_mask(struct snd_kcontrol *kcontrol,
 257                                        struct snd_ctl_elem_value *ucontrol)
 258 {
 259         ucontrol->value.iec958.status[0] = 0xff;
 260         ucontrol->value.iec958.status[1] = 0xff;
 261         ucontrol->value.iec958.status[2] = 0xff;
 262         ucontrol->value.iec958.status[3] = 0xff;
 263         ucontrol->value.iec958.status[4] = 0xff;
 264
 265         return 0;
 266 }
 267
 268 static int img_spdif_in_get_status(struct snd_kcontrol *kcontrol,
 269                                   struct snd_ctl_elem_value *ucontrol)
 270 {
 271         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 272         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 273         u32 reg;
 274
 275         reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CSL);
 276         ucontrol->value.iec958.status[0] = reg & 0xff;
 277         ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;
 278         ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;
 279         ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;
 280         reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CSH);
 281         ucontrol->value.iec958.status[4] = (reg & IMG_SPDIF_IN_CSH_MASK)
 282                 >> IMG_SPDIF_IN_CSH_SHIFT;
 283
 284         return 0;
 285 }
 286
 287 static int img_spdif_in_info_multi_freq(struct snd_kcontrol *kcontrol,
 288                 struct snd_ctl_elem_info *uinfo)
 289 {
 290         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 291         uinfo->count = IMG_SPDIF_IN_NUM_ACLKGEN;
 292         uinfo->value.integer.min = 0;
 293         uinfo->value.integer.max = LONG_MAX;
 294
 295         return 0;
 296 }
 297
 298 static int img_spdif_in_get_multi_freq(struct snd_kcontrol *kcontrol,
 299                                   struct snd_ctl_elem_value *ucontrol)
 300 {
 301         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 302         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 303         unsigned long flags;
 304
 305         spin_lock_irqsave(&spdif->lock, flags);
 306         if (spdif->multi_freq) {
 307                 ucontrol->value.integer.value[0] = spdif->multi_freqs[0];
 308                 ucontrol->value.integer.value[1] = spdif->multi_freqs[1];
 309                 ucontrol->value.integer.value[2] = spdif->multi_freqs[2];
 310                 ucontrol->value.integer.value[3] = spdif->multi_freqs[3];
 311         } else {
 312                 ucontrol->value.integer.value[0] = 0;
 313                 ucontrol->value.integer.value[1] = 0;
 314                 ucontrol->value.integer.value[2] = 0;
 315                 ucontrol->value.integer.value[3] = 0;
 316         }
 317         spin_unlock_irqrestore(&spdif->lock, flags);
 318
 319         return 0;
 320 }
 321
 322 static int img_spdif_in_set_multi_freq(struct snd_kcontrol *kcontrol,
 323                                   struct snd_ctl_elem_value *ucontrol)
 324 {
 325         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 326         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 327         unsigned int multi_freqs[IMG_SPDIF_IN_NUM_ACLKGEN];
 328         bool multi_freq;
 329         unsigned long flags;
 330
 331         if ((ucontrol->value.integer.value[0] == 0) &&
 332                         (ucontrol->value.integer.value[1] == 0) &&
 333                         (ucontrol->value.integer.value[2] == 0) &&
 334                         (ucontrol->value.integer.value[3] == 0)) {
 335                 multi_freq = false;
 336         } else {
 337                 multi_freqs[0] = ucontrol->value.integer.value[0];
 338                 multi_freqs[1] = ucontrol->value.integer.value[1];
 339                 multi_freqs[2] = ucontrol->value.integer.value[2];
 340                 multi_freqs[3] = ucontrol->value.integer.value[3];
 341                 multi_freq = true;
 342         }
 343
 344         if (multi_freq)
 345                 return img_spdif_in_do_clkgen_multi(spdif, multi_freqs);
 346
 347         spin_lock_irqsave(&spdif->lock, flags);
 348
 349         if (spdif->active) {
 350                 spin_unlock_irqrestore(&spdif->lock, flags);
 351                 return -EBUSY;
 352         }
 353
 354         spdif->multi_freq = false;
 355
 356         spin_unlock_irqrestore(&spdif->lock, flags);
 357
 358         return 0;
 359 }
 360
 361 static int img_spdif_in_info_lock_freq(struct snd_kcontrol *kcontrol,
 362                 struct snd_ctl_elem_info *uinfo)
 363 {
 364         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 365         uinfo->count = 1;
 366         uinfo->value.integer.min = 0;
 367         uinfo->value.integer.max = LONG_MAX;
 368
 369         return 0;
 370 }
 371
 372 static int img_spdif_in_get_lock_freq(struct snd_kcontrol *kcontrol,
 373                                   struct snd_ctl_elem_value *uc)
 374 {
 375         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 376         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 377         u32 reg;
 378         int i;
 379         unsigned long flags;
 380
 381         spin_lock_irqsave(&spdif->lock, flags);
 382
 383         reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_STATUS);
 384         if (reg & IMG_SPDIF_IN_STATUS_LOCK_MASK) {
 385                 if (spdif->multi_freq) {
 386                         i = ((reg & IMG_SPDIF_IN_STATUS_SAM_MASK) >>
 387                                         IMG_SPDIF_IN_STATUS_SAM_SHIFT) - 1;
 388                         uc->value.integer.value[0] = spdif->multi_freqs[i];
 389                 } else {
 390                         uc->value.integer.value[0] = spdif->single_freq;
 391                 }
 392         } else {
 393                 uc->value.integer.value[0] = 0;
 394         }
 395
 396         spin_unlock_irqrestore(&spdif->lock, flags);
 397
 398         return 0;
 399 }
 400
 401 static int img_spdif_in_info_trk(struct snd_kcontrol *kcontrol,
 402                 struct snd_ctl_elem_info *uinfo)
 403 {
 404         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 405         uinfo->count = 1;
 406         uinfo->value.integer.min = 0;
 407         uinfo->value.integer.max = 255;
 408
 409         return 0;
 410 }
 411
 412 static int img_spdif_in_get_trk(struct snd_kcontrol *kcontrol,
 413                                   struct snd_ctl_elem_value *ucontrol)
 414 {
 415         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 416         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 417
 418         ucontrol->value.integer.value[0] = spdif->trk;
 419
 420         return 0;
 421 }
 422
 423 static int img_spdif_in_set_trk(struct snd_kcontrol *kcontrol,
 424                                   struct snd_ctl_elem_value *ucontrol)
 425 {
 426         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 427         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 428         unsigned long flags;
 429         int i;
 430         u32 reg;
 431
 432         spin_lock_irqsave(&spdif->lock, flags);
 433
 434         if (spdif->active) {
 435                 spin_unlock_irqrestore(&spdif->lock, flags);
 436                 return -EBUSY;
 437         }
 438
 439         spdif->trk = ucontrol->value.integer.value[0];
 440
 441         reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 442         reg &= ~IMG_SPDIF_IN_CTL_TRK_MASK;
 443         reg |= spdif->trk << IMG_SPDIF_IN_CTL_TRK_SHIFT;
 444         img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
 445
 446         for (i = 0; i < IMG_SPDIF_IN_NUM_ACLKGEN; i++) {
 447                 spdif->aclkgen_regs[i] = (spdif->aclkgen_regs[i] &
 448                         ~IMG_SPDIF_IN_ACLKGEN_TRK_MASK) |
 449                         (spdif->trk << IMG_SPDIF_IN_ACLKGEN_TRK_SHIFT);
 450
 451                 img_spdif_in_aclkgen_writel(spdif, i);
 452         }
 453
 454         spin_unlock_irqrestore(&spdif->lock, flags);
 455
 456         return 0;
 457 }
 458
 459 static int img_spdif_in_info_lock(struct snd_kcontrol *kcontrol,
 460                 struct snd_ctl_elem_info *uinfo)
 461 {
 462         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 463         uinfo->count = 1;
 464         uinfo->value.integer.min = -128;
 465         uinfo->value.integer.max = 127;
 466
 467         return 0;
 468 }
 469
 470 static int img_spdif_in_get_lock_acquire(struct snd_kcontrol *kcontrol,
 471                                   struct snd_ctl_elem_value *ucontrol)
 472 {
 473         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 474         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 475
 476         ucontrol->value.integer.value[0] = spdif->lock_acquire;
 477
 478         return 0;
 479 }
 480
 481 static int img_spdif_in_set_lock_acquire(struct snd_kcontrol *kcontrol,
 482                                   struct snd_ctl_elem_value *ucontrol)
 483 {
 484         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 485         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 486         unsigned long flags;
 487         u32 reg;
 488
 489         spin_lock_irqsave(&spdif->lock, flags);
 490
 491         if (spdif->active) {
 492                 spin_unlock_irqrestore(&spdif->lock, flags);
 493                 return -EBUSY;
 494         }
 495
 496         spdif->lock_acquire = ucontrol->value.integer.value[0];
 497
 498         reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 499         reg &= ~IMG_SPDIF_IN_CTL_LOCKHI_MASK;
 500         reg |= (spdif->lock_acquire << IMG_SPDIF_IN_CTL_LOCKHI_SHIFT) &
 501                 IMG_SPDIF_IN_CTL_LOCKHI_MASK;
 502         img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
 503
 504         spin_unlock_irqrestore(&spdif->lock, flags);
 505
 506         return 0;
 507 }
 508
 509 static int img_spdif_in_get_lock_release(struct snd_kcontrol *kcontrol,
 510                                   struct snd_ctl_elem_value *ucontrol)
 511 {
 512         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 513         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 514
 515         ucontrol->value.integer.value[0] = spdif->lock_release;
 516
 517         return 0;
 518 }
 519
 520 static int img_spdif_in_set_lock_release(struct snd_kcontrol *kcontrol,
 521                                   struct snd_ctl_elem_value *ucontrol)
 522 {
 523         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 524         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 525         unsigned long flags;
 526         u32 reg;
 527
 528         spin_lock_irqsave(&spdif->lock, flags);
 529
 530         if (spdif->active) {
 531                 spin_unlock_irqrestore(&spdif->lock, flags);
 532                 return -EBUSY;
 533         }
 534
 535         spdif->lock_release = ucontrol->value.integer.value[0];
 536
 537         reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 538         reg &= ~IMG_SPDIF_IN_CTL_LOCKLO_MASK;
 539         reg |= (spdif->lock_release << IMG_SPDIF_IN_CTL_LOCKLO_SHIFT) &
 540                 IMG_SPDIF_IN_CTL_LOCKLO_MASK;
 541         img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
 542
 543         spin_unlock_irqrestore(&spdif->lock, flags);
 544
 545         return 0;
 546 }
 547
 548 static struct snd_kcontrol_new img_spdif_in_controls[] = {
 549         {
 550                 .access = SNDRV_CTL_ELEM_ACCESS_READ,
 551                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 552                 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, MASK),
 553                 .info = img_spdif_in_iec958_info,
 554                 .get = img_spdif_in_get_status_mask
 555         },
 556         {
 557                 .access = SNDRV_CTL_ELEM_ACCESS_READ |
 558                         SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 559                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 560                 .name = SNDRV_CTL_NAME_IEC958("", CAPTURE, DEFAULT),
 561                 .info = img_spdif_in_iec958_info,
 562                 .get = img_spdif_in_get_status
 563         },
 564         {
 565                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 566                 .name = "SPDIF In Multi Frequency Acquire",
 567                 .info = img_spdif_in_info_multi_freq,
 568                 .get = img_spdif_in_get_multi_freq,
 569                 .put = img_spdif_in_set_multi_freq
 570         },
 571         {
 572                 .access = SNDRV_CTL_ELEM_ACCESS_READ |
 573                         SNDRV_CTL_ELEM_ACCESS_VOLATILE,
 574                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 575                 .name = "SPDIF In Lock Frequency",
 576                 .info = img_spdif_in_info_lock_freq,
 577                 .get = img_spdif_in_get_lock_freq
 578         },
 579         {
 580                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 581                 .name = "SPDIF In Lock TRK",
 582                 .info = img_spdif_in_info_trk,
 583                 .get = img_spdif_in_get_trk,
 584                 .put = img_spdif_in_set_trk
 585         },
 586         {
 587                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 588                 .name = "SPDIF In Lock Acquire Threshold",
 589                 .info = img_spdif_in_info_lock,
 590                 .get = img_spdif_in_get_lock_acquire,
 591                 .put = img_spdif_in_set_lock_acquire
 592         },
 593         {
 594                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 595                 .name = "SPDIF In Lock Release Threshold",
 596                 .info = img_spdif_in_info_lock,
 597                 .get = img_spdif_in_get_lock_release,
 598                 .put = img_spdif_in_set_lock_release
 599         }
 600 };
 601
 602 static int img_spdif_in_trigger(struct snd_pcm_substream *substream, int cmd,
 603         struct snd_soc_dai *dai)
 604 {
 605         unsigned long flags;
 606         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
 607         int ret = 0;
 608         u32 reg;
 609
 610         spin_lock_irqsave(&spdif->lock, flags);
 611
 612         switch (cmd) {
 613         case SNDRV_PCM_TRIGGER_START:
 614         case SNDRV_PCM_TRIGGER_RESUME:
 615         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 616                 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 617                 if (spdif->multi_freq)
 618                         reg &= ~IMG_SPDIF_IN_CTL_SRD_MASK;
 619                 else
 620                         reg |= (1UL << IMG_SPDIF_IN_CTL_SRD_SHIFT);
 621                 reg |= IMG_SPDIF_IN_CTL_SRT_MASK;
 622                 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
 623                 spdif->active = true;
 624                 break;
 625         case SNDRV_PCM_TRIGGER_STOP:
 626         case SNDRV_PCM_TRIGGER_SUSPEND:
 627         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 628                 reg = img_spdif_in_readl(spdif, IMG_SPDIF_IN_CTL);
 629                 reg &= ~IMG_SPDIF_IN_CTL_SRT_MASK;
 630                 img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
 631                 spdif->active = false;
 632                 break;
 633         default:
 634                 ret = -EINVAL;
 635         }
 636
 637         spin_unlock_irqrestore(&spdif->lock, flags);
 638
 639         return ret;
 640 }
 641
 642 static int img_spdif_in_hw_params(struct snd_pcm_substream *substream,
 643         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 644 {
 645         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
 646         unsigned int rate, channels;
 647         snd_pcm_format_t format;
 648
 649         rate = params_rate(params);
 650         channels = params_channels(params);
 651         format = params_format(params);
 652
 653         if (format != SNDRV_PCM_FORMAT_S32_LE)
 654                 return -EINVAL;
 655
 656         if (channels != 2)
 657                 return -EINVAL;
 658
 659         return img_spdif_in_do_clkgen_single(spdif, rate);
 660 }
 661
 662 static const struct snd_soc_dai_ops img_spdif_in_dai_ops = {
 663         .trigger = img_spdif_in_trigger,
 664         .hw_params = img_spdif_in_hw_params
 665 };
 666
 667 static int img_spdif_in_dai_probe(struct snd_soc_dai *dai)
 668 {
 669         struct img_spdif_in *spdif = snd_soc_dai_get_drvdata(dai);
 670
 671         snd_soc_dai_init_dma_data(dai, NULL, &spdif->dma_data);
 672
 673         snd_soc_add_dai_controls(dai, img_spdif_in_controls,
 674                         ARRAY_SIZE(img_spdif_in_controls));
 675
 676         return 0;
 677 }
 678
 679 static struct snd_soc_dai_driver img_spdif_in_dai = {
 680         .probe = img_spdif_in_dai_probe,
 681         .capture = {
 682                 .channels_min = 2,
 683                 .channels_max = 2,
 684                 .rates = SNDRV_PCM_RATE_8000_192000,
 685                 .formats = SNDRV_PCM_FMTBIT_S32_LE
 686         },
 687         .ops = &img_spdif_in_dai_ops
 688 };
 689
 690 static const struct snd_soc_component_driver img_spdif_in_component = {
 691         .name = "img-spdif-in"
 692 };
 693
 694 static int img_spdif_in_probe(struct platform_device *pdev)
 695 {
 696         struct img_spdif_in *spdif;
 697         struct resource *res;
 698         void __iomem *base;
 699         int ret;
 700         struct reset_control *rst;
 701         u32 reg;
 702         struct device *dev = &pdev->dev;
 703
 704         spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
 705         if (!spdif)
 706                 return -ENOMEM;
 707
 708         platform_set_drvdata(pdev, spdif);
 709
 710         spdif->dev = &pdev->dev;
 711
 712         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 713         base = devm_ioremap_resource(&pdev->dev, res);
 714         if (IS_ERR(base))
 715                 return PTR_ERR(base);
 716
 717         spdif->base = base;
 718
 719         spdif->clk_sys = devm_clk_get(dev, "sys");
 720         if (IS_ERR(spdif->clk_sys)) {
 721                 if (PTR_ERR(spdif->clk_sys) != -EPROBE_DEFER)
 722                         dev_err(dev, "Failed to acquire clock 'sys'\n");
 723                 return PTR_ERR(spdif->clk_sys);
 724         }
 725
 726         ret = clk_prepare_enable(spdif->clk_sys);
 727         if (ret)
 728                 return ret;
 729
 730         rst = devm_reset_control_get(&pdev->dev, "rst");
 731         if (IS_ERR(rst)) {
 732                 if (PTR_ERR(rst) == -EPROBE_DEFER) {
 733                         ret = -EPROBE_DEFER;
 734                         goto err_clk_disable;
 735                 }
 736                 dev_dbg(dev, "No top level reset found\n");
 737                 img_spdif_in_writel(spdif, IMG_SPDIF_IN_SOFT_RESET_MASK,
 738                                 IMG_SPDIF_IN_SOFT_RESET);
 739                 img_spdif_in_writel(spdif, 0, IMG_SPDIF_IN_SOFT_RESET);
 740         } else {
 741                 reset_control_assert(rst);
 742                 reset_control_deassert(rst);
 743         }
 744
 745         spin_lock_init(&spdif->lock);
 746
 747         spdif->dma_data.addr = res->start + IMG_SPDIF_IN_RX_FIFO_OFFSET;
 748         spdif->dma_data.addr_width = 4;
 749         spdif->dma_data.maxburst = 4;
 750         spdif->trk = 0x80;
 751         spdif->lock_acquire = 4;
 752         spdif->lock_release = -128;
 753
 754         reg = (spdif->lock_acquire << IMG_SPDIF_IN_CTL_LOCKHI_SHIFT) &
 755                 IMG_SPDIF_IN_CTL_LOCKHI_MASK;
 756         reg |= (spdif->lock_release << IMG_SPDIF_IN_CTL_LOCKLO_SHIFT) &
 757                 IMG_SPDIF_IN_CTL_LOCKLO_MASK;
 758         reg |= (spdif->trk << IMG_SPDIF_IN_CTL_TRK_SHIFT) &
 759                 IMG_SPDIF_IN_CTL_TRK_MASK;
 760         img_spdif_in_writel(spdif, reg, IMG_SPDIF_IN_CTL);
 761
 762         ret = devm_snd_soc_register_component(&pdev->dev,
 763                         &img_spdif_in_component, &img_spdif_in_dai, 1);
 764         if (ret)
 765                 goto err_clk_disable;
 766
 767         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 768         if (ret)
 769                 goto err_clk_disable;
 770
 771         return 0;
 772
 773 err_clk_disable:
 774         clk_disable_unprepare(spdif->clk_sys);
 775
 776         return ret;
 777 }
 778
 779 static int img_spdif_in_dev_remove(struct platform_device *pdev)
 780 {
 781         struct img_spdif_in *spdif = platform_get_drvdata(pdev);
 782
 783         clk_disable_unprepare(spdif->clk_sys);
 784
 785         return 0;
 786 }
 787
 788 static const struct of_device_id img_spdif_in_of_match[] = {
 789         { .compatible = "img,spdif-in" },
 790         {}
 791 };
 792 MODULE_DEVICE_TABLE(of, img_spdif_in_of_match);
 793
 794 static struct platform_driver img_spdif_in_driver = {
 795         .driver = {
 796                 .name = "img-spdif-in",
 797                 .of_match_table = img_spdif_in_of_match
 798         },
 799         .probe = img_spdif_in_probe,
 800         .remove = img_spdif_in_dev_remove
 801 };
 802 module_platform_driver(img_spdif_in_driver);
 803
 804 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
 805 MODULE_DESCRIPTION("IMG SPDIF Input driver");
 806 MODULE_LICENSE("GPL v2");