sound/soc/ti/omap-mcbsp-st.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * McBSP Sidetone support
   4  *
   5  * Copyright (C) 2004 Nokia Corporation
   6  * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
   7  *
   8  * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
   9  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/err.h>
  18 #include <linux/clk.h>
  19 #include <linux/delay.h>
  20 #include <linux/io.h>
  21 #include <linux/slab.h>
  22 #include <linux/pm_runtime.h>
  23
  24 #include "omap-mcbsp.h"
  25 #include "omap-mcbsp-priv.h"
  26
  27 /* OMAP3 sidetone control registers */
  28 #define OMAP_ST_REG_REV         0x00
  29 #define OMAP_ST_REG_SYSCONFIG   0x10
  30 #define OMAP_ST_REG_IRQSTATUS   0x18
  31 #define OMAP_ST_REG_IRQENABLE   0x1C
  32 #define OMAP_ST_REG_SGAINCR     0x24
  33 #define OMAP_ST_REG_SFIRCR      0x28
  34 #define OMAP_ST_REG_SSELCR      0x2C
  35
  36 /********************** McBSP SSELCR bit definitions ***********************/
  37 #define SIDETONEEN              BIT(10)
  38
  39 /********************** McBSP Sidetone SYSCONFIG bit definitions ***********/
  40 #define ST_AUTOIDLE             BIT(0)
  41
  42 /********************** McBSP Sidetone SGAINCR bit definitions *************/
  43 #define ST_CH0GAIN(value)       ((value) & 0xffff)      /* Bits 0:15 */
  44 #define ST_CH1GAIN(value)       (((value) & 0xffff) << 16) /* Bits 16:31 */
  45
  46 /********************** McBSP Sidetone SFIRCR bit definitions **************/
  47 #define ST_FIRCOEFF(value)      ((value) & 0xffff)      /* Bits 0:15 */
  48
  49 /********************** McBSP Sidetone SSELCR bit definitions **************/
  50 #define ST_SIDETONEEN           BIT(0)
  51 #define ST_COEFFWREN            BIT(1)
  52 #define ST_COEFFWRDONE          BIT(2)
  53
  54 struct omap_mcbsp_st_data {
  55         void __iomem *io_base_st;
  56         struct clk *mcbsp_iclk;
  57         bool running;
  58         bool enabled;
  59         s16 taps[128];  /* Sidetone filter coefficients */
  60         int nr_taps;    /* Number of filter coefficients in use */
  61         s16 ch0gain;
  62         s16 ch1gain;
  63 };
  64
  65 static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
  66 {
  67         writel_relaxed(val, mcbsp->st_data->io_base_st + reg);
  68 }
  69
  70 static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
  71 {
  72         return readl_relaxed(mcbsp->st_data->io_base_st + reg);
  73 }
  74
  75 #define MCBSP_ST_READ(mcbsp, reg) omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
  76 #define MCBSP_ST_WRITE(mcbsp, reg, val) \
  77                         omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
  78
  79 static void omap_mcbsp_st_on(struct omap_mcbsp *mcbsp)
  80 {
  81         unsigned int w;
  82
  83         if (mcbsp->pdata->force_ick_on)
  84                 mcbsp->pdata->force_ick_on(mcbsp->st_data->mcbsp_iclk, true);
  85
  86         /* Disable Sidetone clock auto-gating for normal operation */
  87         w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
  88         MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
  89
  90         /* Enable McBSP Sidetone */
  91         w = MCBSP_READ(mcbsp, SSELCR);
  92         MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
  93
  94         /* Enable Sidetone from Sidetone Core */
  95         w = MCBSP_ST_READ(mcbsp, SSELCR);
  96         MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
  97 }
  98
  99 static void omap_mcbsp_st_off(struct omap_mcbsp *mcbsp)
 100 {
 101         unsigned int w;
 102
 103         w = MCBSP_ST_READ(mcbsp, SSELCR);
 104         MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
 105
 106         w = MCBSP_READ(mcbsp, SSELCR);
 107         MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
 108
 109         /* Enable Sidetone clock auto-gating to reduce power consumption */
 110         w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
 111         MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w | ST_AUTOIDLE);
 112
 113         if (mcbsp->pdata->force_ick_on)
 114                 mcbsp->pdata->force_ick_on(mcbsp->st_data->mcbsp_iclk, false);
 115 }
 116
 117 static void omap_mcbsp_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
 118 {
 119         u16 val, i;
 120
 121         val = MCBSP_ST_READ(mcbsp, SSELCR);
 122
 123         if (val & ST_COEFFWREN)
 124                 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
 125
 126         MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
 127
 128         for (i = 0; i < 128; i++)
 129                 MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
 130
 131         i = 0;
 132
 133         val = MCBSP_ST_READ(mcbsp, SSELCR);
 134         while (!(val & ST_COEFFWRDONE) && (++i < 1000))
 135                 val = MCBSP_ST_READ(mcbsp, SSELCR);
 136
 137         MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
 138
 139         if (i == 1000)
 140                 dev_err(mcbsp->dev, "McBSP FIR load error!\n");
 141 }
 142
 143 static void omap_mcbsp_st_chgain(struct omap_mcbsp *mcbsp)
 144 {
 145         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 146
 147         MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) |
 148                        ST_CH1GAIN(st_data->ch1gain));
 149 }
 150
 151 static int omap_mcbsp_st_set_chgain(struct omap_mcbsp *mcbsp, int channel,
 152                                     s16 chgain)
 153 {
 154         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 155         int ret = 0;
 156
 157         if (!st_data)
 158                 return -ENOENT;
 159
 160         spin_lock_irq(&mcbsp->lock);
 161         if (channel == 0)
 162                 st_data->ch0gain = chgain;
 163         else if (channel == 1)
 164                 st_data->ch1gain = chgain;
 165         else
 166                 ret = -EINVAL;
 167
 168         if (st_data->enabled)
 169                 omap_mcbsp_st_chgain(mcbsp);
 170         spin_unlock_irq(&mcbsp->lock);
 171
 172         return ret;
 173 }
 174
 175 static int omap_mcbsp_st_get_chgain(struct omap_mcbsp *mcbsp, int channel,
 176                                     s16 *chgain)
 177 {
 178         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 179         int ret = 0;
 180
 181         if (!st_data)
 182                 return -ENOENT;
 183
 184         spin_lock_irq(&mcbsp->lock);
 185         if (channel == 0)
 186                 *chgain = st_data->ch0gain;
 187         else if (channel == 1)
 188                 *chgain = st_data->ch1gain;
 189         else
 190                 ret = -EINVAL;
 191         spin_unlock_irq(&mcbsp->lock);
 192
 193         return ret;
 194 }
 195
 196 static int omap_mcbsp_st_enable(struct omap_mcbsp *mcbsp)
 197 {
 198         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 199
 200         if (!st_data)
 201                 return -ENODEV;
 202
 203         spin_lock_irq(&mcbsp->lock);
 204         st_data->enabled = 1;
 205         omap_mcbsp_st_start(mcbsp);
 206         spin_unlock_irq(&mcbsp->lock);
 207
 208         return 0;
 209 }
 210
 211 static int omap_mcbsp_st_disable(struct omap_mcbsp *mcbsp)
 212 {
 213         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 214         int ret = 0;
 215
 216         if (!st_data)
 217                 return -ENODEV;
 218
 219         spin_lock_irq(&mcbsp->lock);
 220         omap_mcbsp_st_stop(mcbsp);
 221         st_data->enabled = 0;
 222         spin_unlock_irq(&mcbsp->lock);
 223
 224         return ret;
 225 }
 226
 227 static int omap_mcbsp_st_is_enabled(struct omap_mcbsp *mcbsp)
 228 {
 229         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 230
 231         if (!st_data)
 232                 return -ENODEV;
 233
 234         return st_data->enabled;
 235 }
 236
 237 static ssize_t st_taps_show(struct device *dev,
 238                             struct device_attribute *attr, char *buf)
 239 {
 240         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 241         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 242         ssize_t status = 0;
 243         int i;
 244
 245         spin_lock_irq(&mcbsp->lock);
 246         for (i = 0; i < st_data->nr_taps; i++)
 247                 status += sprintf(&buf[status], (i ? ", %d" : "%d"),
 248                                   st_data->taps[i]);
 249         if (i)
 250                 status += sprintf(&buf[status], "\n");
 251         spin_unlock_irq(&mcbsp->lock);
 252
 253         return status;
 254 }
 255
 256 static ssize_t st_taps_store(struct device *dev,
 257                              struct device_attribute *attr,
 258                              const char *buf, size_t size)
 259 {
 260         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 261         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 262         int val, tmp, status, i = 0;
 263
 264         spin_lock_irq(&mcbsp->lock);
 265         memset(st_data->taps, 0, sizeof(st_data->taps));
 266         st_data->nr_taps = 0;
 267
 268         do {
 269                 status = sscanf(buf, "%d%n", &val, &tmp);
 270                 if (status < 0 || status == 0) {
 271                         size = -EINVAL;
 272                         goto out;
 273                 }
 274                 if (val < -32768 || val > 32767) {
 275                         size = -EINVAL;
 276                         goto out;
 277                 }
 278                 st_data->taps[i++] = val;
 279                 buf += tmp;
 280                 if (*buf != ',')
 281                         break;
 282                 buf++;
 283         } while (1);
 284
 285         st_data->nr_taps = i;
 286
 287 out:
 288         spin_unlock_irq(&mcbsp->lock);
 289
 290         return size;
 291 }
 292
 293 static DEVICE_ATTR_RW(st_taps);
 294
 295 static const struct attribute *sidetone_attrs[] = {
 296         &dev_attr_st_taps.attr,
 297         NULL,
 298 };
 299
 300 static const struct attribute_group sidetone_attr_group = {
 301         .attrs = (struct attribute **)sidetone_attrs,
 302 };
 303
 304 int omap_mcbsp_st_start(struct omap_mcbsp *mcbsp)
 305 {
 306         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 307
 308         if (st_data->enabled && !st_data->running) {
 309                 omap_mcbsp_st_fir_write(mcbsp, st_data->taps);
 310                 omap_mcbsp_st_chgain(mcbsp);
 311
 312                 if (!mcbsp->free) {
 313                         omap_mcbsp_st_on(mcbsp);
 314                         st_data->running = 1;
 315                 }
 316         }
 317
 318         return 0;
 319 }
 320
 321 int omap_mcbsp_st_stop(struct omap_mcbsp *mcbsp)
 322 {
 323         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 324
 325         if (st_data->running) {
 326                 if (!mcbsp->free) {
 327                         omap_mcbsp_st_off(mcbsp);
 328                         st_data->running = 0;
 329                 }
 330         }
 331
 332         return 0;
 333 }
 334
 335 int omap_mcbsp_st_init(struct platform_device *pdev)
 336 {
 337         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
 338         struct omap_mcbsp_st_data *st_data;
 339         struct resource *res;
 340         int ret;
 341
 342         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sidetone");
 343         if (!res)
 344                 return 0;
 345
 346         st_data = devm_kzalloc(mcbsp->dev, sizeof(*mcbsp->st_data), GFP_KERNEL);
 347         if (!st_data)
 348                 return -ENOMEM;
 349
 350         st_data->mcbsp_iclk = devm_clk_get(mcbsp->dev, "ick");
 351         if (IS_ERR(st_data->mcbsp_iclk)) {
 352                 dev_warn(mcbsp->dev,
 353                          "Failed to get ick, sidetone might be broken\n");
 354                 st_data->mcbsp_iclk = NULL;
 355         }
 356
 357         st_data->io_base_st = devm_ioremap(mcbsp->dev, res->start,
 358                                            resource_size(res));
 359         if (!st_data->io_base_st)
 360                 return -ENOMEM;
 361
 362         ret = devm_device_add_group(mcbsp->dev, &sidetone_attr_group);
 363         if (ret)
 364                 return ret;
 365
 366         mcbsp->st_data = st_data;
 367
 368         return 0;
 369 }
 370
 371 static int omap_mcbsp_st_info_volsw(struct snd_kcontrol *kcontrol,
 372                                     struct snd_ctl_elem_info *uinfo)
 373 {
 374         struct soc_mixer_control *mc =
 375                 (struct soc_mixer_control *)kcontrol->private_value;
 376         int max = mc->max;
 377         int min = mc->min;
 378
 379         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
 380         uinfo->count = 1;
 381         uinfo->value.integer.min = min;
 382         uinfo->value.integer.max = max;
 383         return 0;
 384 }
 385
 386 #define OMAP_MCBSP_ST_CHANNEL_VOLUME(channel)                           \
 387 static int                                                              \
 388 omap_mcbsp_set_st_ch##channel##_volume(struct snd_kcontrol *kc,         \
 389                                        struct snd_ctl_elem_value *uc)   \
 390 {                                                                       \
 391         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kc);            \
 392         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);    \
 393         struct soc_mixer_control *mc =                                  \
 394                 (struct soc_mixer_control *)kc->private_value;          \
 395         int max = mc->max;                                              \
 396         int min = mc->min;                                              \
 397         int val = uc->value.integer.value[0];                           \
 398                                                                         \
 399         if (val < min || val > max)                                     \
 400                 return -EINVAL;                                         \
 401                                                                         \
 402         /* OMAP McBSP implementation uses index values 0..4 */          \
 403         return omap_mcbsp_st_set_chgain(mcbsp, channel, val);           \
 404 }                                                                       \
 405                                                                         \
 406 static int                                                              \
 407 omap_mcbsp_get_st_ch##channel##_volume(struct snd_kcontrol *kc,         \
 408                                        struct snd_ctl_elem_value *uc)   \
 409 {                                                                       \
 410         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kc);            \
 411         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);    \
 412         s16 chgain;                                                     \
 413                                                                         \
 414         if (omap_mcbsp_st_get_chgain(mcbsp, channel, &chgain))          \
 415                 return -EAGAIN;                                         \
 416                                                                         \
 417         uc->value.integer.value[0] = chgain;                            \
 418         return 0;                                                       \
 419 }
 420
 421 OMAP_MCBSP_ST_CHANNEL_VOLUME(0)
 422 OMAP_MCBSP_ST_CHANNEL_VOLUME(1)
 423
 424 static int omap_mcbsp_st_put_mode(struct snd_kcontrol *kcontrol,
 425                                   struct snd_ctl_elem_value *ucontrol)
 426 {
 427         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 428         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 429         u8 value = ucontrol->value.integer.value[0];
 430
 431         if (value == omap_mcbsp_st_is_enabled(mcbsp))
 432                 return 0;
 433
 434         if (value)
 435                 omap_mcbsp_st_enable(mcbsp);
 436         else
 437                 omap_mcbsp_st_disable(mcbsp);
 438
 439         return 1;
 440 }
 441
 442 static int omap_mcbsp_st_get_mode(struct snd_kcontrol *kcontrol,
 443                                   struct snd_ctl_elem_value *ucontrol)
 444 {
 445         struct snd_soc_dai *cpu_dai = snd_kcontrol_chip(kcontrol);
 446         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 447
 448         ucontrol->value.integer.value[0] = omap_mcbsp_st_is_enabled(mcbsp);
 449         return 0;
 450 }
 451
 452 #define OMAP_MCBSP_SOC_SINGLE_S16_EXT(xname, xmin, xmax,                \
 453                                       xhandler_get, xhandler_put)       \
 454 {       .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname,             \
 455         .info = omap_mcbsp_st_info_volsw,                               \
 456         .get = xhandler_get, .put = xhandler_put,                       \
 457         .private_value = (unsigned long)&(struct soc_mixer_control)     \
 458         {.min = xmin, .max = xmax} }
 459
 460 #define OMAP_MCBSP_ST_CONTROLS(port)                                      \
 461 static const struct snd_kcontrol_new omap_mcbsp##port##_st_controls[] = { \
 462 SOC_SINGLE_EXT("McBSP" #port " Sidetone Switch", 1, 0, 1, 0,              \
 463                omap_mcbsp_st_get_mode, omap_mcbsp_st_put_mode),           \
 464 OMAP_MCBSP_SOC_SINGLE_S16_EXT("McBSP" #port " Sidetone Channel 0 Volume", \
 465                               -32768, 32767,                              \
 466                               omap_mcbsp_get_st_ch0_volume,               \
 467                               omap_mcbsp_set_st_ch0_volume),              \
 468 OMAP_MCBSP_SOC_SINGLE_S16_EXT("McBSP" #port " Sidetone Channel 1 Volume", \
 469                               -32768, 32767,                              \
 470                               omap_mcbsp_get_st_ch1_volume,               \
 471                               omap_mcbsp_set_st_ch1_volume),              \
 472 }
 473
 474 OMAP_MCBSP_ST_CONTROLS(2);
 475 OMAP_MCBSP_ST_CONTROLS(3);
 476
 477 int omap_mcbsp_st_add_controls(struct snd_soc_pcm_runtime *rtd, int port_id)
 478 {
 479         struct snd_soc_dai *cpu_dai = asoc_rtd_to_cpu(rtd, 0);
 480         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 481
 482         if (!mcbsp->st_data) {
 483                 dev_warn(mcbsp->dev, "No sidetone data for port\n");
 484                 return 0;
 485         }
 486
 487         switch (port_id) {
 488         case 2: /* McBSP 2 */
 489                 return snd_soc_add_dai_controls(cpu_dai,
 490                                         omap_mcbsp2_st_controls,
 491                                         ARRAY_SIZE(omap_mcbsp2_st_controls));
 492         case 3: /* McBSP 3 */
 493                 return snd_soc_add_dai_controls(cpu_dai,
 494                                         omap_mcbsp3_st_controls,
 495                                         ARRAY_SIZE(omap_mcbsp3_st_controls));
 496         default:
 497                 dev_err(mcbsp->dev, "Port %d not supported\n", port_id);
 498                 break;
 499         }
 500
 501         return -EINVAL;
 502 }
 503 EXPORT_SYMBOL_GPL(omap_mcbsp_st_add_controls);