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

   1 /*
   2  * IMG SPDIF output 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/pm_runtime.h>
  20 #include <linux/reset.h>
  21
  22 #include <sound/core.h>
  23 #include <sound/dmaengine_pcm.h>
  24 #include <sound/initval.h>
  25 #include <sound/pcm.h>
  26 #include <sound/pcm_params.h>
  27 #include <sound/soc.h>
  28
  29 #define IMG_SPDIF_OUT_TX_FIFO           0x0
  30
  31 #define IMG_SPDIF_OUT_CTL               0x4
  32 #define IMG_SPDIF_OUT_CTL_FS_MASK       BIT(4)
  33 #define IMG_SPDIF_OUT_CTL_CLK_MASK      BIT(2)
  34 #define IMG_SPDIF_OUT_CTL_SRT_MASK      BIT(0)
  35
  36 #define IMG_SPDIF_OUT_CSL               0x14
  37
  38 #define IMG_SPDIF_OUT_CSH_UV            0x18
  39 #define IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT  0
  40 #define IMG_SPDIF_OUT_CSH_UV_CSH_MASK   0xff
  41
  42 struct img_spdif_out {
  43         spinlock_t lock;
  44         void __iomem *base;
  45         struct clk *clk_sys;
  46         struct clk *clk_ref;
  47         struct snd_dmaengine_dai_dma_data dma_data;
  48         struct device *dev;
  49         struct reset_control *rst;
  50         u32 suspend_ctl;
  51         u32 suspend_csl;
  52         u32 suspend_csh;
  53 };
  54
  55 static int img_spdif_out_runtime_suspend(struct device *dev)
  56 {
  57         struct img_spdif_out *spdif = dev_get_drvdata(dev);
  58
  59         clk_disable_unprepare(spdif->clk_ref);
  60         clk_disable_unprepare(spdif->clk_sys);
  61
  62         return 0;
  63 }
  64
  65 static int img_spdif_out_runtime_resume(struct device *dev)
  66 {
  67         struct img_spdif_out *spdif = dev_get_drvdata(dev);
  68         int ret;
  69
  70         ret = clk_prepare_enable(spdif->clk_sys);
  71         if (ret) {
  72                 dev_err(dev, "clk_enable failed: %d\n", ret);
  73                 return ret;
  74         }
  75
  76         ret = clk_prepare_enable(spdif->clk_ref);
  77         if (ret) {
  78                 dev_err(dev, "clk_enable failed: %d\n", ret);
  79                 clk_disable_unprepare(spdif->clk_sys);
  80                 return ret;
  81         }
  82
  83         return 0;
  84 }
  85
  86 static inline void img_spdif_out_writel(struct img_spdif_out *spdif, u32 val,
  87                                 u32 reg)
  88 {
  89         writel(val, spdif->base + reg);
  90 }
  91
  92 static inline u32 img_spdif_out_readl(struct img_spdif_out *spdif, u32 reg)
  93 {
  94         return readl(spdif->base + reg);
  95 }
  96
  97 static void img_spdif_out_reset(struct img_spdif_out *spdif)
  98 {
  99         u32 ctl, status_low, status_high;
 100
 101         ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL) &
 102                         ~IMG_SPDIF_OUT_CTL_SRT_MASK;
 103         status_low = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
 104         status_high = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
 105
 106         reset_control_assert(spdif->rst);
 107         reset_control_deassert(spdif->rst);
 108
 109         img_spdif_out_writel(spdif, ctl, IMG_SPDIF_OUT_CTL);
 110         img_spdif_out_writel(spdif, status_low, IMG_SPDIF_OUT_CSL);
 111         img_spdif_out_writel(spdif, status_high, IMG_SPDIF_OUT_CSH_UV);
 112 }
 113
 114 static int img_spdif_out_info(struct snd_kcontrol *kcontrol,
 115                                         struct snd_ctl_elem_info *uinfo)
 116 {
 117         uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
 118         uinfo->count = 1;
 119
 120         return 0;
 121 }
 122
 123 static int img_spdif_out_get_status_mask(struct snd_kcontrol *kcontrol,
 124                                        struct snd_ctl_elem_value *ucontrol)
 125 {
 126         ucontrol->value.iec958.status[0] = 0xff;
 127         ucontrol->value.iec958.status[1] = 0xff;
 128         ucontrol->value.iec958.status[2] = 0xff;
 129         ucontrol->value.iec958.status[3] = 0xff;
 130         ucontrol->value.iec958.status[4] = 0xff;
 131
 132         return 0;
 133 }
 134
 135 static int img_spdif_out_get_status(struct snd_kcontrol *kcontrol,
 136                                   struct snd_ctl_elem_value *ucontrol)
 137 {
 138         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 139         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 140         u32 reg;
 141         unsigned long flags;
 142
 143         spin_lock_irqsave(&spdif->lock, flags);
 144
 145         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
 146         ucontrol->value.iec958.status[0] = reg & 0xff;
 147         ucontrol->value.iec958.status[1] = (reg >> 8) & 0xff;
 148         ucontrol->value.iec958.status[2] = (reg >> 16) & 0xff;
 149         ucontrol->value.iec958.status[3] = (reg >> 24) & 0xff;
 150
 151         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
 152         ucontrol->value.iec958.status[4] =
 153                 (reg & IMG_SPDIF_OUT_CSH_UV_CSH_MASK) >>
 154                 IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;
 155
 156         spin_unlock_irqrestore(&spdif->lock, flags);
 157
 158         return 0;
 159 }
 160
 161 static int img_spdif_out_set_status(struct snd_kcontrol *kcontrol,
 162                                   struct snd_ctl_elem_value *ucontrol)
 163 {
 164         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 165         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(cpu_dai);
 166         u32 reg;
 167         unsigned long flags;
 168
 169         reg = ((u32)ucontrol->value.iec958.status[3] << 24);
 170         reg |= ((u32)ucontrol->value.iec958.status[2] << 16);
 171         reg |= ((u32)ucontrol->value.iec958.status[1] << 8);
 172         reg |= (u32)ucontrol->value.iec958.status[0];
 173
 174         spin_lock_irqsave(&spdif->lock, flags);
 175
 176         img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSL);
 177
 178         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
 179         reg &= ~IMG_SPDIF_OUT_CSH_UV_CSH_MASK;
 180         reg |= (u32)ucontrol->value.iec958.status[4] <<
 181                         IMG_SPDIF_OUT_CSH_UV_CSH_SHIFT;
 182         img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CSH_UV);
 183
 184         spin_unlock_irqrestore(&spdif->lock, flags);
 185
 186         return 0;
 187 }
 188
 189 static struct snd_kcontrol_new img_spdif_out_controls[] = {
 190         {
 191                 .access = SNDRV_CTL_ELEM_ACCESS_READ,
 192                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 193                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, MASK),
 194                 .info = img_spdif_out_info,
 195                 .get = img_spdif_out_get_status_mask
 196         },
 197         {
 198                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
 199                 .name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
 200                 .info = img_spdif_out_info,
 201                 .get = img_spdif_out_get_status,
 202                 .put = img_spdif_out_set_status
 203         }
 204 };
 205
 206 static int img_spdif_out_trigger(struct snd_pcm_substream *substream, int cmd,
 207                         struct snd_soc_dai *dai)
 208 {
 209         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
 210         u32 reg;
 211         unsigned long flags;
 212
 213         switch (cmd) {
 214         case SNDRV_PCM_TRIGGER_START:
 215         case SNDRV_PCM_TRIGGER_RESUME:
 216         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 217                 reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
 218                 reg |= IMG_SPDIF_OUT_CTL_SRT_MASK;
 219                 img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);
 220                 break;
 221         case SNDRV_PCM_TRIGGER_STOP:
 222         case SNDRV_PCM_TRIGGER_SUSPEND:
 223         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 224                 spin_lock_irqsave(&spdif->lock, flags);
 225                 img_spdif_out_reset(spdif);
 226                 spin_unlock_irqrestore(&spdif->lock, flags);
 227                 break;
 228         default:
 229                 return -EINVAL;
 230         }
 231
 232         return 0;
 233 }
 234
 235 static int img_spdif_out_hw_params(struct snd_pcm_substream *substream,
 236         struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
 237 {
 238         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
 239         unsigned int channels;
 240         long pre_div_a, pre_div_b, diff_a, diff_b, rate, clk_rate;
 241         u32 reg;
 242         snd_pcm_format_t format;
 243
 244         rate = params_rate(params);
 245         format = params_format(params);
 246         channels = params_channels(params);
 247
 248         dev_dbg(spdif->dev, "hw_params rate %ld channels %u format %u\n",
 249                         rate, channels, format);
 250
 251         if (format != SNDRV_PCM_FORMAT_S32_LE)
 252                 return -EINVAL;
 253
 254         if (channels != 2)
 255                 return -EINVAL;
 256
 257         pre_div_a = clk_round_rate(spdif->clk_ref, rate * 256);
 258         if (pre_div_a < 0)
 259                 return pre_div_a;
 260         pre_div_b = clk_round_rate(spdif->clk_ref, rate * 384);
 261         if (pre_div_b < 0)
 262                 return pre_div_b;
 263
 264         diff_a = abs((pre_div_a / 256) - rate);
 265         diff_b = abs((pre_div_b / 384) - rate);
 266
 267         /* If diffs are equal, use lower clock rate */
 268         if (diff_a > diff_b)
 269                 clk_set_rate(spdif->clk_ref, pre_div_b);
 270         else
 271                 clk_set_rate(spdif->clk_ref, pre_div_a);
 272
 273         /*
 274          * Another driver (eg machine driver) may have rejected the above
 275          * change. Get the current rate and set the register bit according to
 276          * the new min diff
 277          */
 278         clk_rate = clk_get_rate(spdif->clk_ref);
 279
 280         diff_a = abs((clk_rate / 256) - rate);
 281         diff_b = abs((clk_rate / 384) - rate);
 282
 283         reg = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
 284         if (diff_a <= diff_b)
 285                 reg &= ~IMG_SPDIF_OUT_CTL_CLK_MASK;
 286         else
 287                 reg |= IMG_SPDIF_OUT_CTL_CLK_MASK;
 288         img_spdif_out_writel(spdif, reg, IMG_SPDIF_OUT_CTL);
 289
 290         return 0;
 291 }
 292
 293 static const struct snd_soc_dai_ops img_spdif_out_dai_ops = {
 294         .trigger = img_spdif_out_trigger,
 295         .hw_params = img_spdif_out_hw_params
 296 };
 297
 298 static int img_spdif_out_dai_probe(struct snd_soc_dai *dai)
 299 {
 300         struct img_spdif_out *spdif = snd_soc_dai_get_drvdata(dai);
 301
 302         snd_soc_dai_init_dma_data(dai, &spdif->dma_data, NULL);
 303
 304         snd_soc_add_dai_controls(dai, img_spdif_out_controls,
 305                         ARRAY_SIZE(img_spdif_out_controls));
 306
 307         return 0;
 308 }
 309
 310 static struct snd_soc_dai_driver img_spdif_out_dai = {
 311         .probe = img_spdif_out_dai_probe,
 312         .playback = {
 313                 .channels_min = 2,
 314                 .channels_max = 2,
 315                 .rates = SNDRV_PCM_RATE_8000_192000,
 316                 .formats = SNDRV_PCM_FMTBIT_S32_LE
 317         },
 318         .ops = &img_spdif_out_dai_ops
 319 };
 320
 321 static const struct snd_soc_component_driver img_spdif_out_component = {
 322         .name = "img-spdif-out"
 323 };
 324
 325 static int img_spdif_out_probe(struct platform_device *pdev)
 326 {
 327         struct img_spdif_out *spdif;
 328         struct resource *res;
 329         void __iomem *base;
 330         int ret;
 331         struct device *dev = &pdev->dev;
 332
 333         spdif = devm_kzalloc(&pdev->dev, sizeof(*spdif), GFP_KERNEL);
 334         if (!spdif)
 335                 return -ENOMEM;
 336
 337         platform_set_drvdata(pdev, spdif);
 338
 339         spdif->dev = &pdev->dev;
 340
 341         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 342         base = devm_ioremap_resource(&pdev->dev, res);
 343         if (IS_ERR(base))
 344                 return PTR_ERR(base);
 345
 346         spdif->base = base;
 347
 348         spdif->rst = devm_reset_control_get_exclusive(&pdev->dev, "rst");
 349         if (IS_ERR(spdif->rst)) {
 350                 if (PTR_ERR(spdif->rst) != -EPROBE_DEFER)
 351                         dev_err(&pdev->dev, "No top level reset found\n");
 352                 return PTR_ERR(spdif->rst);
 353         }
 354
 355         spdif->clk_sys = devm_clk_get(&pdev->dev, "sys");
 356         if (IS_ERR(spdif->clk_sys)) {
 357                 if (PTR_ERR(spdif->clk_sys) != -EPROBE_DEFER)
 358                         dev_err(dev, "Failed to acquire clock 'sys'\n");
 359                 return PTR_ERR(spdif->clk_sys);
 360         }
 361
 362         spdif->clk_ref = devm_clk_get(&pdev->dev, "ref");
 363         if (IS_ERR(spdif->clk_ref)) {
 364                 if (PTR_ERR(spdif->clk_ref) != -EPROBE_DEFER)
 365                         dev_err(dev, "Failed to acquire clock 'ref'\n");
 366                 return PTR_ERR(spdif->clk_ref);
 367         }
 368
 369         pm_runtime_enable(&pdev->dev);
 370         if (!pm_runtime_enabled(&pdev->dev)) {
 371                 ret = img_spdif_out_runtime_resume(&pdev->dev);
 372                 if (ret)
 373                         goto err_pm_disable;
 374         }
 375         ret = pm_runtime_get_sync(&pdev->dev);
 376         if (ret < 0)
 377                 goto err_suspend;
 378
 379         img_spdif_out_writel(spdif, IMG_SPDIF_OUT_CTL_FS_MASK,
 380                              IMG_SPDIF_OUT_CTL);
 381
 382         img_spdif_out_reset(spdif);
 383         pm_runtime_put(&pdev->dev);
 384
 385         spin_lock_init(&spdif->lock);
 386
 387         spdif->dma_data.addr = res->start + IMG_SPDIF_OUT_TX_FIFO;
 388         spdif->dma_data.addr_width = 4;
 389         spdif->dma_data.maxburst = 4;
 390
 391         ret = devm_snd_soc_register_component(&pdev->dev,
 392                         &img_spdif_out_component,
 393                         &img_spdif_out_dai, 1);
 394         if (ret)
 395                 goto err_suspend;
 396
 397         ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
 398         if (ret)
 399                 goto err_suspend;
 400
 401         dev_dbg(&pdev->dev, "Probe successful\n");
 402
 403         return 0;
 404
 405 err_suspend:
 406         if (!pm_runtime_status_suspended(&pdev->dev))
 407                 img_spdif_out_runtime_suspend(&pdev->dev);
 408 err_pm_disable:
 409         pm_runtime_disable(&pdev->dev);
 410
 411         return ret;
 412 }
 413
 414 static int img_spdif_out_dev_remove(struct platform_device *pdev)
 415 {
 416         pm_runtime_disable(&pdev->dev);
 417         if (!pm_runtime_status_suspended(&pdev->dev))
 418                 img_spdif_out_runtime_suspend(&pdev->dev);
 419
 420         return 0;
 421 }
 422
 423 #ifdef CONFIG_PM_SLEEP
 424 static int img_spdif_out_suspend(struct device *dev)
 425 {
 426         struct img_spdif_out *spdif = dev_get_drvdata(dev);
 427         int ret;
 428
 429         if (pm_runtime_status_suspended(dev)) {
 430                 ret = img_spdif_out_runtime_resume(dev);
 431                 if (ret)
 432                         return ret;
 433         }
 434
 435         spdif->suspend_ctl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CTL);
 436         spdif->suspend_csl = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSL);
 437         spdif->suspend_csh = img_spdif_out_readl(spdif, IMG_SPDIF_OUT_CSH_UV);
 438
 439         img_spdif_out_runtime_suspend(dev);
 440
 441         return 0;
 442 }
 443
 444 static int img_spdif_out_resume(struct device *dev)
 445 {
 446         struct img_spdif_out *spdif = dev_get_drvdata(dev);
 447         int ret;
 448
 449         ret = img_spdif_out_runtime_resume(dev);
 450         if (ret)
 451                 return ret;
 452
 453         img_spdif_out_writel(spdif, spdif->suspend_ctl, IMG_SPDIF_OUT_CTL);
 454         img_spdif_out_writel(spdif, spdif->suspend_csl, IMG_SPDIF_OUT_CSL);
 455         img_spdif_out_writel(spdif, spdif->suspend_csh, IMG_SPDIF_OUT_CSH_UV);
 456
 457         if (pm_runtime_status_suspended(dev))
 458                 img_spdif_out_runtime_suspend(dev);
 459
 460         return 0;
 461 }
 462 #endif
 463 static const struct of_device_id img_spdif_out_of_match[] = {
 464         { .compatible = "img,spdif-out" },
 465         {}
 466 };
 467 MODULE_DEVICE_TABLE(of, img_spdif_out_of_match);
 468
 469 static const struct dev_pm_ops img_spdif_out_pm_ops = {
 470         SET_RUNTIME_PM_OPS(img_spdif_out_runtime_suspend,
 471                            img_spdif_out_runtime_resume, NULL)
 472         SET_SYSTEM_SLEEP_PM_OPS(img_spdif_out_suspend, img_spdif_out_resume)
 473 };
 474
 475 static struct platform_driver img_spdif_out_driver = {
 476         .driver = {
 477                 .name = "img-spdif-out",
 478                 .of_match_table = img_spdif_out_of_match,
 479                 .pm = &img_spdif_out_pm_ops
 480         },
 481         .probe = img_spdif_out_probe,
 482         .remove = img_spdif_out_dev_remove
 483 };
 484 module_platform_driver(img_spdif_out_driver);
 485
 486 MODULE_AUTHOR("Damien Horsley <Damien.Horsley@imgtec.com>");
 487 MODULE_DESCRIPTION("IMG SPDIF Output driver");
 488 MODULE_LICENSE("GPL v2");