sound/soc/omap/mcbsp.c

   1 /*
   2  * sound/soc/omap/mcbsp.c
   3  *
   4  * Copyright (C) 2004 Nokia Corporation
   5  * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
   6  *
   7  * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
   8  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  * Multichannel mode not supported.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/err.h>
  23 #include <linux/clk.h>
  24 #include <linux/delay.h>
  25 #include <linux/io.h>
  26 #include <linux/slab.h>
  27 #include <linux/pm_runtime.h>
  28
  29 #include <linux/platform_data/asoc-ti-mcbsp.h>
  30
  31 #include "mcbsp.h"
  32
  33 static void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
  34 {
  35         void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
  36
  37         if (mcbsp->pdata->reg_size == 2) {
  38                 ((u16 *)mcbsp->reg_cache)[reg] = (u16)val;
  39                 writew_relaxed((u16)val, addr);
  40         } else {
  41                 ((u32 *)mcbsp->reg_cache)[reg] = val;
  42                 writel_relaxed(val, addr);
  43         }
  44 }
  45
  46 static int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
  47 {
  48         void __iomem *addr = mcbsp->io_base + reg * mcbsp->pdata->reg_step;
  49
  50         if (mcbsp->pdata->reg_size == 2) {
  51                 return !from_cache ? readw_relaxed(addr) :
  52                                      ((u16 *)mcbsp->reg_cache)[reg];
  53         } else {
  54                 return !from_cache ? readl_relaxed(addr) :
  55                                      ((u32 *)mcbsp->reg_cache)[reg];
  56         }
  57 }
  58
  59 static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
  60 {
  61         writel_relaxed(val, mcbsp->st_data->io_base_st + reg);
  62 }
  63
  64 static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
  65 {
  66         return readl_relaxed(mcbsp->st_data->io_base_st + reg);
  67 }
  68
  69 #define MCBSP_READ(mcbsp, reg) \
  70                 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0)
  71 #define MCBSP_WRITE(mcbsp, reg, val) \
  72                 omap_mcbsp_write(mcbsp, OMAP_MCBSP_REG_##reg, val)
  73 #define MCBSP_READ_CACHE(mcbsp, reg) \
  74                 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 1)
  75
  76 #define MCBSP_ST_READ(mcbsp, reg) \
  77                         omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
  78 #define MCBSP_ST_WRITE(mcbsp, reg, val) \
  79                         omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
  80
  81 static void omap_mcbsp_dump_reg(struct omap_mcbsp *mcbsp)
  82 {
  83         dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
  84         dev_dbg(mcbsp->dev, "DRR2:  0x%04x\n",
  85                         MCBSP_READ(mcbsp, DRR2));
  86         dev_dbg(mcbsp->dev, "DRR1:  0x%04x\n",
  87                         MCBSP_READ(mcbsp, DRR1));
  88         dev_dbg(mcbsp->dev, "DXR2:  0x%04x\n",
  89                         MCBSP_READ(mcbsp, DXR2));
  90         dev_dbg(mcbsp->dev, "DXR1:  0x%04x\n",
  91                         MCBSP_READ(mcbsp, DXR1));
  92         dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
  93                         MCBSP_READ(mcbsp, SPCR2));
  94         dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
  95                         MCBSP_READ(mcbsp, SPCR1));
  96         dev_dbg(mcbsp->dev, "RCR2:  0x%04x\n",
  97                         MCBSP_READ(mcbsp, RCR2));
  98         dev_dbg(mcbsp->dev, "RCR1:  0x%04x\n",
  99                         MCBSP_READ(mcbsp, RCR1));
 100         dev_dbg(mcbsp->dev, "XCR2:  0x%04x\n",
 101                         MCBSP_READ(mcbsp, XCR2));
 102         dev_dbg(mcbsp->dev, "XCR1:  0x%04x\n",
 103                         MCBSP_READ(mcbsp, XCR1));
 104         dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
 105                         MCBSP_READ(mcbsp, SRGR2));
 106         dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
 107                         MCBSP_READ(mcbsp, SRGR1));
 108         dev_dbg(mcbsp->dev, "PCR0:  0x%04x\n",
 109                         MCBSP_READ(mcbsp, PCR0));
 110         dev_dbg(mcbsp->dev, "***********************\n");
 111 }
 112
 113 static irqreturn_t omap_mcbsp_irq_handler(int irq, void *dev_id)
 114 {
 115         struct omap_mcbsp *mcbsp = dev_id;
 116         u16 irqst;
 117
 118         irqst = MCBSP_READ(mcbsp, IRQST);
 119         dev_dbg(mcbsp->dev, "IRQ callback : 0x%x\n", irqst);
 120
 121         if (irqst & RSYNCERREN)
 122                 dev_err(mcbsp->dev, "RX Frame Sync Error!\n");
 123         if (irqst & RFSREN)
 124                 dev_dbg(mcbsp->dev, "RX Frame Sync\n");
 125         if (irqst & REOFEN)
 126                 dev_dbg(mcbsp->dev, "RX End Of Frame\n");
 127         if (irqst & RRDYEN)
 128                 dev_dbg(mcbsp->dev, "RX Buffer Threshold Reached\n");
 129         if (irqst & RUNDFLEN)
 130                 dev_err(mcbsp->dev, "RX Buffer Underflow!\n");
 131         if (irqst & ROVFLEN)
 132                 dev_err(mcbsp->dev, "RX Buffer Overflow!\n");
 133
 134         if (irqst & XSYNCERREN)
 135                 dev_err(mcbsp->dev, "TX Frame Sync Error!\n");
 136         if (irqst & XFSXEN)
 137                 dev_dbg(mcbsp->dev, "TX Frame Sync\n");
 138         if (irqst & XEOFEN)
 139                 dev_dbg(mcbsp->dev, "TX End Of Frame\n");
 140         if (irqst & XRDYEN)
 141                 dev_dbg(mcbsp->dev, "TX Buffer threshold Reached\n");
 142         if (irqst & XUNDFLEN)
 143                 dev_err(mcbsp->dev, "TX Buffer Underflow!\n");
 144         if (irqst & XOVFLEN)
 145                 dev_err(mcbsp->dev, "TX Buffer Overflow!\n");
 146         if (irqst & XEMPTYEOFEN)
 147                 dev_dbg(mcbsp->dev, "TX Buffer empty at end of frame\n");
 148
 149         MCBSP_WRITE(mcbsp, IRQST, irqst);
 150
 151         return IRQ_HANDLED;
 152 }
 153
 154 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
 155 {
 156         struct omap_mcbsp *mcbsp_tx = dev_id;
 157         u16 irqst_spcr2;
 158
 159         irqst_spcr2 = MCBSP_READ(mcbsp_tx, SPCR2);
 160         dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
 161
 162         if (irqst_spcr2 & XSYNC_ERR) {
 163                 dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
 164                         irqst_spcr2);
 165                 /* Writing zero to XSYNC_ERR clears the IRQ */
 166                 MCBSP_WRITE(mcbsp_tx, SPCR2, MCBSP_READ_CACHE(mcbsp_tx, SPCR2));
 167         }
 168
 169         return IRQ_HANDLED;
 170 }
 171
 172 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
 173 {
 174         struct omap_mcbsp *mcbsp_rx = dev_id;
 175         u16 irqst_spcr1;
 176
 177         irqst_spcr1 = MCBSP_READ(mcbsp_rx, SPCR1);
 178         dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
 179
 180         if (irqst_spcr1 & RSYNC_ERR) {
 181                 dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
 182                         irqst_spcr1);
 183                 /* Writing zero to RSYNC_ERR clears the IRQ */
 184                 MCBSP_WRITE(mcbsp_rx, SPCR1, MCBSP_READ_CACHE(mcbsp_rx, SPCR1));
 185         }
 186
 187         return IRQ_HANDLED;
 188 }
 189
 190 /*
 191  * omap_mcbsp_config simply write a config to the
 192  * appropriate McBSP.
 193  * You either call this function or set the McBSP registers
 194  * by yourself before calling omap_mcbsp_start().
 195  */
 196 void omap_mcbsp_config(struct omap_mcbsp *mcbsp,
 197                        const struct omap_mcbsp_reg_cfg *config)
 198 {
 199         dev_dbg(mcbsp->dev, "Configuring McBSP%d  phys_base: 0x%08lx\n",
 200                         mcbsp->id, mcbsp->phys_base);
 201
 202         /* We write the given config */
 203         MCBSP_WRITE(mcbsp, SPCR2, config->spcr2);
 204         MCBSP_WRITE(mcbsp, SPCR1, config->spcr1);
 205         MCBSP_WRITE(mcbsp, RCR2, config->rcr2);
 206         MCBSP_WRITE(mcbsp, RCR1, config->rcr1);
 207         MCBSP_WRITE(mcbsp, XCR2, config->xcr2);
 208         MCBSP_WRITE(mcbsp, XCR1, config->xcr1);
 209         MCBSP_WRITE(mcbsp, SRGR2, config->srgr2);
 210         MCBSP_WRITE(mcbsp, SRGR1, config->srgr1);
 211         MCBSP_WRITE(mcbsp, MCR2, config->mcr2);
 212         MCBSP_WRITE(mcbsp, MCR1, config->mcr1);
 213         MCBSP_WRITE(mcbsp, PCR0, config->pcr0);
 214         if (mcbsp->pdata->has_ccr) {
 215                 MCBSP_WRITE(mcbsp, XCCR, config->xccr);
 216                 MCBSP_WRITE(mcbsp, RCCR, config->rccr);
 217         }
 218         /* Enable wakeup behavior */
 219         if (mcbsp->pdata->has_wakeup)
 220                 MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN);
 221
 222         /* Enable TX/RX sync error interrupts by default */
 223         if (mcbsp->irq)
 224                 MCBSP_WRITE(mcbsp, IRQEN, RSYNCERREN | XSYNCERREN);
 225 }
 226
 227 /**
 228  * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register
 229  * @id - mcbsp id
 230  * @stream - indicates the direction of data flow (rx or tx)
 231  *
 232  * Returns the address of mcbsp data transmit register or data receive register
 233  * to be used by DMA for transferring/receiving data based on the value of
 234  * @stream for the requested mcbsp given by @id
 235  */
 236 static int omap_mcbsp_dma_reg_params(struct omap_mcbsp *mcbsp,
 237                                      unsigned int stream)
 238 {
 239         int data_reg;
 240
 241         if (mcbsp->pdata->reg_size == 2) {
 242                 if (stream)
 243                         data_reg = OMAP_MCBSP_REG_DRR1;
 244                 else
 245                         data_reg = OMAP_MCBSP_REG_DXR1;
 246         } else {
 247                 if (stream)
 248                         data_reg = OMAP_MCBSP_REG_DRR;
 249                 else
 250                         data_reg = OMAP_MCBSP_REG_DXR;
 251         }
 252
 253         return mcbsp->phys_dma_base + data_reg * mcbsp->pdata->reg_step;
 254 }
 255
 256 static void omap_st_on(struct omap_mcbsp *mcbsp)
 257 {
 258         unsigned int w;
 259
 260         if (mcbsp->pdata->enable_st_clock)
 261                 mcbsp->pdata->enable_st_clock(mcbsp->id, 1);
 262
 263         /* Disable Sidetone clock auto-gating for normal operation */
 264         w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
 265         MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
 266
 267         /* Enable McBSP Sidetone */
 268         w = MCBSP_READ(mcbsp, SSELCR);
 269         MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
 270
 271         /* Enable Sidetone from Sidetone Core */
 272         w = MCBSP_ST_READ(mcbsp, SSELCR);
 273         MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
 274 }
 275
 276 static void omap_st_off(struct omap_mcbsp *mcbsp)
 277 {
 278         unsigned int w;
 279
 280         w = MCBSP_ST_READ(mcbsp, SSELCR);
 281         MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
 282
 283         w = MCBSP_READ(mcbsp, SSELCR);
 284         MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
 285
 286         /* Enable Sidetone clock auto-gating to reduce power consumption */
 287         w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
 288         MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w | ST_AUTOIDLE);
 289
 290         if (mcbsp->pdata->enable_st_clock)
 291                 mcbsp->pdata->enable_st_clock(mcbsp->id, 0);
 292 }
 293
 294 static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
 295 {
 296         u16 val, i;
 297
 298         val = MCBSP_ST_READ(mcbsp, SSELCR);
 299
 300         if (val & ST_COEFFWREN)
 301                 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
 302
 303         MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
 304
 305         for (i = 0; i < 128; i++)
 306                 MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
 307
 308         i = 0;
 309
 310         val = MCBSP_ST_READ(mcbsp, SSELCR);
 311         while (!(val & ST_COEFFWRDONE) && (++i < 1000))
 312                 val = MCBSP_ST_READ(mcbsp, SSELCR);
 313
 314         MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
 315
 316         if (i == 1000)
 317                 dev_err(mcbsp->dev, "McBSP FIR load error!\n");
 318 }
 319
 320 static void omap_st_chgain(struct omap_mcbsp *mcbsp)
 321 {
 322         u16 w;
 323         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 324
 325         w = MCBSP_ST_READ(mcbsp, SSELCR);
 326
 327         MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) | \
 328                       ST_CH1GAIN(st_data->ch1gain));
 329 }
 330
 331 int omap_st_set_chgain(struct omap_mcbsp *mcbsp, int channel, s16 chgain)
 332 {
 333         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 334         int ret = 0;
 335
 336         if (!st_data)
 337                 return -ENOENT;
 338
 339         spin_lock_irq(&mcbsp->lock);
 340         if (channel == 0)
 341                 st_data->ch0gain = chgain;
 342         else if (channel == 1)
 343                 st_data->ch1gain = chgain;
 344         else
 345                 ret = -EINVAL;
 346
 347         if (st_data->enabled)
 348                 omap_st_chgain(mcbsp);
 349         spin_unlock_irq(&mcbsp->lock);
 350
 351         return ret;
 352 }
 353
 354 int omap_st_get_chgain(struct omap_mcbsp *mcbsp, int channel, s16 *chgain)
 355 {
 356         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 357         int ret = 0;
 358
 359         if (!st_data)
 360                 return -ENOENT;
 361
 362         spin_lock_irq(&mcbsp->lock);
 363         if (channel == 0)
 364                 *chgain = st_data->ch0gain;
 365         else if (channel == 1)
 366                 *chgain = st_data->ch1gain;
 367         else
 368                 ret = -EINVAL;
 369         spin_unlock_irq(&mcbsp->lock);
 370
 371         return ret;
 372 }
 373
 374 static int omap_st_start(struct omap_mcbsp *mcbsp)
 375 {
 376         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 377
 378         if (st_data->enabled && !st_data->running) {
 379                 omap_st_fir_write(mcbsp, st_data->taps);
 380                 omap_st_chgain(mcbsp);
 381
 382                 if (!mcbsp->free) {
 383                         omap_st_on(mcbsp);
 384                         st_data->running = 1;
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391 int omap_st_enable(struct omap_mcbsp *mcbsp)
 392 {
 393         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 394
 395         if (!st_data)
 396                 return -ENODEV;
 397
 398         spin_lock_irq(&mcbsp->lock);
 399         st_data->enabled = 1;
 400         omap_st_start(mcbsp);
 401         spin_unlock_irq(&mcbsp->lock);
 402
 403         return 0;
 404 }
 405
 406 static int omap_st_stop(struct omap_mcbsp *mcbsp)
 407 {
 408         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 409
 410         if (st_data->running) {
 411                 if (!mcbsp->free) {
 412                         omap_st_off(mcbsp);
 413                         st_data->running = 0;
 414                 }
 415         }
 416
 417         return 0;
 418 }
 419
 420 int omap_st_disable(struct omap_mcbsp *mcbsp)
 421 {
 422         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 423         int ret = 0;
 424
 425         if (!st_data)
 426                 return -ENODEV;
 427
 428         spin_lock_irq(&mcbsp->lock);
 429         omap_st_stop(mcbsp);
 430         st_data->enabled = 0;
 431         spin_unlock_irq(&mcbsp->lock);
 432
 433         return ret;
 434 }
 435
 436 int omap_st_is_enabled(struct omap_mcbsp *mcbsp)
 437 {
 438         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 439
 440         if (!st_data)
 441                 return -ENODEV;
 442
 443         return st_data->enabled;
 444 }
 445
 446 /*
 447  * omap_mcbsp_set_rx_threshold configures the transmit threshold in words.
 448  * The threshold parameter is 1 based, and it is converted (threshold - 1)
 449  * for the THRSH2 register.
 450  */
 451 void omap_mcbsp_set_tx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
 452 {
 453         if (mcbsp->pdata->buffer_size == 0)
 454                 return;
 455
 456         if (threshold && threshold <= mcbsp->max_tx_thres)
 457                 MCBSP_WRITE(mcbsp, THRSH2, threshold - 1);
 458 }
 459
 460 /*
 461  * omap_mcbsp_set_rx_threshold configures the receive threshold in words.
 462  * The threshold parameter is 1 based, and it is converted (threshold - 1)
 463  * for the THRSH1 register.
 464  */
 465 void omap_mcbsp_set_rx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
 466 {
 467         if (mcbsp->pdata->buffer_size == 0)
 468                 return;
 469
 470         if (threshold && threshold <= mcbsp->max_rx_thres)
 471                 MCBSP_WRITE(mcbsp, THRSH1, threshold - 1);
 472 }
 473
 474 /*
 475  * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
 476  */
 477 u16 omap_mcbsp_get_tx_delay(struct omap_mcbsp *mcbsp)
 478 {
 479         u16 buffstat;
 480
 481         if (mcbsp->pdata->buffer_size == 0)
 482                 return 0;
 483
 484         /* Returns the number of free locations in the buffer */
 485         buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
 486
 487         /* Number of slots are different in McBSP ports */
 488         return mcbsp->pdata->buffer_size - buffstat;
 489 }
 490
 491 /*
 492  * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
 493  * to reach the threshold value (when the DMA will be triggered to read it)
 494  */
 495 u16 omap_mcbsp_get_rx_delay(struct omap_mcbsp *mcbsp)
 496 {
 497         u16 buffstat, threshold;
 498
 499         if (mcbsp->pdata->buffer_size == 0)
 500                 return 0;
 501
 502         /* Returns the number of used locations in the buffer */
 503         buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
 504         /* RX threshold */
 505         threshold = MCBSP_READ(mcbsp, THRSH1);
 506
 507         /* Return the number of location till we reach the threshold limit */
 508         if (threshold <= buffstat)
 509                 return 0;
 510         else
 511                 return threshold - buffstat;
 512 }
 513
 514 int omap_mcbsp_request(struct omap_mcbsp *mcbsp)
 515 {
 516         void *reg_cache;
 517         int err;
 518
 519         reg_cache = kzalloc(mcbsp->reg_cache_size, GFP_KERNEL);
 520         if (!reg_cache) {
 521                 return -ENOMEM;
 522         }
 523
 524         spin_lock(&mcbsp->lock);
 525         if (!mcbsp->free) {
 526                 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
 527                         mcbsp->id);
 528                 err = -EBUSY;
 529                 goto err_kfree;
 530         }
 531
 532         mcbsp->free = false;
 533         mcbsp->reg_cache = reg_cache;
 534         spin_unlock(&mcbsp->lock);
 535
 536         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
 537                 mcbsp->pdata->ops->request(mcbsp->id - 1);
 538
 539         /*
 540          * Make sure that transmitter, receiver and sample-rate generator are
 541          * not running before activating IRQs.
 542          */
 543         MCBSP_WRITE(mcbsp, SPCR1, 0);
 544         MCBSP_WRITE(mcbsp, SPCR2, 0);
 545
 546         if (mcbsp->irq) {
 547                 err = request_irq(mcbsp->irq, omap_mcbsp_irq_handler, 0,
 548                                   "McBSP", (void *)mcbsp);
 549                 if (err != 0) {
 550                         dev_err(mcbsp->dev, "Unable to request IRQ\n");
 551                         goto err_clk_disable;
 552                 }
 553         } else {
 554                 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler, 0,
 555                                   "McBSP TX", (void *)mcbsp);
 556                 if (err != 0) {
 557                         dev_err(mcbsp->dev, "Unable to request TX IRQ\n");
 558                         goto err_clk_disable;
 559                 }
 560
 561                 err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler, 0,
 562                                   "McBSP RX", (void *)mcbsp);
 563                 if (err != 0) {
 564                         dev_err(mcbsp->dev, "Unable to request RX IRQ\n");
 565                         goto err_free_irq;
 566                 }
 567         }
 568
 569         return 0;
 570 err_free_irq:
 571         free_irq(mcbsp->tx_irq, (void *)mcbsp);
 572 err_clk_disable:
 573         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 574                 mcbsp->pdata->ops->free(mcbsp->id - 1);
 575
 576         /* Disable wakeup behavior */
 577         if (mcbsp->pdata->has_wakeup)
 578                 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
 579
 580         spin_lock(&mcbsp->lock);
 581         mcbsp->free = true;
 582         mcbsp->reg_cache = NULL;
 583 err_kfree:
 584         spin_unlock(&mcbsp->lock);
 585         kfree(reg_cache);
 586
 587         return err;
 588 }
 589
 590 void omap_mcbsp_free(struct omap_mcbsp *mcbsp)
 591 {
 592         void *reg_cache;
 593
 594         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 595                 mcbsp->pdata->ops->free(mcbsp->id - 1);
 596
 597         /* Disable wakeup behavior */
 598         if (mcbsp->pdata->has_wakeup)
 599                 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
 600
 601         /* Disable interrupt requests */
 602         if (mcbsp->irq)
 603                 MCBSP_WRITE(mcbsp, IRQEN, 0);
 604
 605         if (mcbsp->irq) {
 606                 free_irq(mcbsp->irq, (void *)mcbsp);
 607         } else {
 608                 free_irq(mcbsp->rx_irq, (void *)mcbsp);
 609                 free_irq(mcbsp->tx_irq, (void *)mcbsp);
 610         }
 611
 612         reg_cache = mcbsp->reg_cache;
 613
 614         /*
 615          * Select CLKS source from internal source unconditionally before
 616          * marking the McBSP port as free.
 617          * If the external clock source via MCBSP_CLKS pin has been selected the
 618          * system will refuse to enter idle if the CLKS pin source is not reset
 619          * back to internal source.
 620          */
 621         if (!mcbsp_omap1())
 622                 omap2_mcbsp_set_clks_src(mcbsp, MCBSP_CLKS_PRCM_SRC);
 623
 624         spin_lock(&mcbsp->lock);
 625         if (mcbsp->free)
 626                 dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
 627         else
 628                 mcbsp->free = true;
 629         mcbsp->reg_cache = NULL;
 630         spin_unlock(&mcbsp->lock);
 631
 632         kfree(reg_cache);
 633 }
 634
 635 /*
 636  * Here we start the McBSP, by enabling transmitter, receiver or both.
 637  * If no transmitter or receiver is active prior calling, then sample-rate
 638  * generator and frame sync are started.
 639  */
 640 void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int tx, int rx)
 641 {
 642         int enable_srg = 0;
 643         u16 w;
 644
 645         if (mcbsp->st_data)
 646                 omap_st_start(mcbsp);
 647
 648         /* Only enable SRG, if McBSP is master */
 649         w = MCBSP_READ_CACHE(mcbsp, PCR0);
 650         if (w & (FSXM | FSRM | CLKXM | CLKRM))
 651                 enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
 652                                 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 653
 654         if (enable_srg) {
 655                 /* Start the sample generator */
 656                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 657                 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
 658         }
 659
 660         /* Enable transmitter and receiver */
 661         tx &= 1;
 662         w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 663         MCBSP_WRITE(mcbsp, SPCR2, w | tx);
 664
 665         rx &= 1;
 666         w = MCBSP_READ_CACHE(mcbsp, SPCR1);
 667         MCBSP_WRITE(mcbsp, SPCR1, w | rx);
 668
 669         /*
 670          * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
 671          * REVISIT: 100us may give enough time for two CLKSRG, however
 672          * due to some unknown PM related, clock gating etc. reason it
 673          * is now at 500us.
 674          */
 675         udelay(500);
 676
 677         if (enable_srg) {
 678                 /* Start frame sync */
 679                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 680                 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
 681         }
 682
 683         if (mcbsp->pdata->has_ccr) {
 684                 /* Release the transmitter and receiver */
 685                 w = MCBSP_READ_CACHE(mcbsp, XCCR);
 686                 w &= ~(tx ? XDISABLE : 0);
 687                 MCBSP_WRITE(mcbsp, XCCR, w);
 688                 w = MCBSP_READ_CACHE(mcbsp, RCCR);
 689                 w &= ~(rx ? RDISABLE : 0);
 690                 MCBSP_WRITE(mcbsp, RCCR, w);
 691         }
 692
 693         /* Dump McBSP Regs */
 694         omap_mcbsp_dump_reg(mcbsp);
 695 }
 696
 697 void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int tx, int rx)
 698 {
 699         int idle;
 700         u16 w;
 701
 702         /* Reset transmitter */
 703         tx &= 1;
 704         if (mcbsp->pdata->has_ccr) {
 705                 w = MCBSP_READ_CACHE(mcbsp, XCCR);
 706                 w |= (tx ? XDISABLE : 0);
 707                 MCBSP_WRITE(mcbsp, XCCR, w);
 708         }
 709         w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 710         MCBSP_WRITE(mcbsp, SPCR2, w & ~tx);
 711
 712         /* Reset receiver */
 713         rx &= 1;
 714         if (mcbsp->pdata->has_ccr) {
 715                 w = MCBSP_READ_CACHE(mcbsp, RCCR);
 716                 w |= (rx ? RDISABLE : 0);
 717                 MCBSP_WRITE(mcbsp, RCCR, w);
 718         }
 719         w = MCBSP_READ_CACHE(mcbsp, SPCR1);
 720         MCBSP_WRITE(mcbsp, SPCR1, w & ~rx);
 721
 722         idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
 723                         MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 724
 725         if (idle) {
 726                 /* Reset the sample rate generator */
 727                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 728                 MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
 729         }
 730
 731         if (mcbsp->st_data)
 732                 omap_st_stop(mcbsp);
 733 }
 734
 735 int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id)
 736 {
 737         struct clk *fck_src;
 738         const char *src;
 739         int r;
 740
 741         if (fck_src_id == MCBSP_CLKS_PAD_SRC)
 742                 src = "pad_fck";
 743         else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
 744                 src = "prcm_fck";
 745         else
 746                 return -EINVAL;
 747
 748         fck_src = clk_get(mcbsp->dev, src);
 749         if (IS_ERR(fck_src)) {
 750                 dev_err(mcbsp->dev, "CLKS: could not clk_get() %s\n", src);
 751                 return -EINVAL;
 752         }
 753
 754         pm_runtime_put_sync(mcbsp->dev);
 755
 756         r = clk_set_parent(mcbsp->fclk, fck_src);
 757         if (r) {
 758                 dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n",
 759                         src);
 760                 clk_put(fck_src);
 761                 return r;
 762         }
 763
 764         pm_runtime_get_sync(mcbsp->dev);
 765
 766         clk_put(fck_src);
 767
 768         return 0;
 769
 770 }
 771
 772 #define max_thres(m)                    (mcbsp->pdata->buffer_size)
 773 #define valid_threshold(m, val)         ((val) <= max_thres(m))
 774 #define THRESHOLD_PROP_BUILDER(prop)                                    \
 775 static ssize_t prop##_show(struct device *dev,                          \
 776                         struct device_attribute *attr, char *buf)       \
 777 {                                                                       \
 778         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);                \
 779                                                                         \
 780         return sprintf(buf, "%u\n", mcbsp->prop);                       \
 781 }                                                                       \
 782                                                                         \
 783 static ssize_t prop##_store(struct device *dev,                         \
 784                                 struct device_attribute *attr,          \
 785                                 const char *buf, size_t size)           \
 786 {                                                                       \
 787         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);                \
 788         unsigned long val;                                              \
 789         int status;                                                     \
 790                                                                         \
 791         status = kstrtoul(buf, 0, &val);                                \
 792         if (status)                                                     \
 793                 return status;                                          \
 794                                                                         \
 795         if (!valid_threshold(mcbsp, val))                               \
 796                 return -EDOM;                                           \
 797                                                                         \
 798         mcbsp->prop = val;                                              \
 799         return size;                                                    \
 800 }                                                                       \
 801                                                                         \
 802 static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
 803
 804 THRESHOLD_PROP_BUILDER(max_tx_thres);
 805 THRESHOLD_PROP_BUILDER(max_rx_thres);
 806
 807 static const char *dma_op_modes[] = {
 808         "element", "threshold",
 809 };
 810
 811 static ssize_t dma_op_mode_show(struct device *dev,
 812                         struct device_attribute *attr, char *buf)
 813 {
 814         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 815         int dma_op_mode, i = 0;
 816         ssize_t len = 0;
 817         const char * const *s;
 818
 819         dma_op_mode = mcbsp->dma_op_mode;
 820
 821         for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
 822                 if (dma_op_mode == i)
 823                         len += sprintf(buf + len, "[%s] ", *s);
 824                 else
 825                         len += sprintf(buf + len, "%s ", *s);
 826         }
 827         len += sprintf(buf + len, "\n");
 828
 829         return len;
 830 }
 831
 832 static ssize_t dma_op_mode_store(struct device *dev,
 833                                 struct device_attribute *attr,
 834                                 const char *buf, size_t size)
 835 {
 836         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 837         const char * const *s;
 838         int i = 0;
 839
 840         for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++)
 841                 if (sysfs_streq(buf, *s))
 842                         break;
 843
 844         if (i == ARRAY_SIZE(dma_op_modes))
 845                 return -EINVAL;
 846
 847         spin_lock_irq(&mcbsp->lock);
 848         if (!mcbsp->free) {
 849                 size = -EBUSY;
 850                 goto unlock;
 851         }
 852         mcbsp->dma_op_mode = i;
 853
 854 unlock:
 855         spin_unlock_irq(&mcbsp->lock);
 856
 857         return size;
 858 }
 859
 860 static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
 861
 862 static const struct attribute *additional_attrs[] = {
 863         &dev_attr_max_tx_thres.attr,
 864         &dev_attr_max_rx_thres.attr,
 865         &dev_attr_dma_op_mode.attr,
 866         NULL,
 867 };
 868
 869 static const struct attribute_group additional_attr_group = {
 870         .attrs = (struct attribute **)additional_attrs,
 871 };
 872
 873 static ssize_t st_taps_show(struct device *dev,
 874                             struct device_attribute *attr, char *buf)
 875 {
 876         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 877         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 878         ssize_t status = 0;
 879         int i;
 880
 881         spin_lock_irq(&mcbsp->lock);
 882         for (i = 0; i < st_data->nr_taps; i++)
 883                 status += sprintf(&buf[status], (i ? ", %d" : "%d"),
 884                                   st_data->taps[i]);
 885         if (i)
 886                 status += sprintf(&buf[status], "\n");
 887         spin_unlock_irq(&mcbsp->lock);
 888
 889         return status;
 890 }
 891
 892 static ssize_t st_taps_store(struct device *dev,
 893                              struct device_attribute *attr,
 894                              const char *buf, size_t size)
 895 {
 896         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 897         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 898         int val, tmp, status, i = 0;
 899
 900         spin_lock_irq(&mcbsp->lock);
 901         memset(st_data->taps, 0, sizeof(st_data->taps));
 902         st_data->nr_taps = 0;
 903
 904         do {
 905                 status = sscanf(buf, "%d%n", &val, &tmp);
 906                 if (status < 0 || status == 0) {
 907                         size = -EINVAL;
 908                         goto out;
 909                 }
 910                 if (val < -32768 || val > 32767) {
 911                         size = -EINVAL;
 912                         goto out;
 913                 }
 914                 st_data->taps[i++] = val;
 915                 buf += tmp;
 916                 if (*buf != ',')
 917                         break;
 918                 buf++;
 919         } while (1);
 920
 921         st_data->nr_taps = i;
 922
 923 out:
 924         spin_unlock_irq(&mcbsp->lock);
 925
 926         return size;
 927 }
 928
 929 static DEVICE_ATTR(st_taps, 0644, st_taps_show, st_taps_store);
 930
 931 static const struct attribute *sidetone_attrs[] = {
 932         &dev_attr_st_taps.attr,
 933         NULL,
 934 };
 935
 936 static const struct attribute_group sidetone_attr_group = {
 937         .attrs = (struct attribute **)sidetone_attrs,
 938 };
 939
 940 static int omap_st_add(struct omap_mcbsp *mcbsp, struct resource *res)
 941 {
 942         struct omap_mcbsp_st_data *st_data;
 943         int err;
 944
 945         st_data = devm_kzalloc(mcbsp->dev, sizeof(*mcbsp->st_data), GFP_KERNEL);
 946         if (!st_data)
 947                 return -ENOMEM;
 948
 949         st_data->io_base_st = devm_ioremap(mcbsp->dev, res->start,
 950                                            resource_size(res));
 951         if (!st_data->io_base_st)
 952                 return -ENOMEM;
 953
 954         err = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
 955         if (err)
 956                 return err;
 957
 958         mcbsp->st_data = st_data;
 959         return 0;
 960 }
 961
 962 /*
 963  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
 964  * 730 has only 2 McBSP, and both of them are MPU peripherals.
 965  */
 966 int omap_mcbsp_init(struct platform_device *pdev)
 967 {
 968         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
 969         struct resource *res;
 970         int ret = 0;
 971
 972         spin_lock_init(&mcbsp->lock);
 973         mcbsp->free = true;
 974
 975         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 976         if (!res)
 977                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 978
 979         mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res);
 980         if (IS_ERR(mcbsp->io_base))
 981                 return PTR_ERR(mcbsp->io_base);
 982
 983         mcbsp->phys_base = res->start;
 984         mcbsp->reg_cache_size = resource_size(res);
 985
 986         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 987         if (!res)
 988                 mcbsp->phys_dma_base = mcbsp->phys_base;
 989         else
 990                 mcbsp->phys_dma_base = res->start;
 991
 992         /*
 993          * OMAP1, 2 uses two interrupt lines: TX, RX
 994          * OMAP2430, OMAP3 SoC have combined IRQ line as well.
 995          * OMAP4 and newer SoC only have the combined IRQ line.
 996          * Use the combined IRQ if available since it gives better debugging
 997          * possibilities.
 998          */
 999         mcbsp->irq = platform_get_irq_byname(pdev, "common");
1000         if (mcbsp->irq == -ENXIO) {
1001                 mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx");
1002
1003                 if (mcbsp->tx_irq == -ENXIO) {
1004                         mcbsp->irq = platform_get_irq(pdev, 0);
1005                         mcbsp->tx_irq = 0;
1006                 } else {
1007                         mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx");
1008                         mcbsp->irq = 0;
1009                 }
1010         }
1011
1012         if (!pdev->dev.of_node) {
1013                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1014                 if (!res) {
1015                         dev_err(&pdev->dev, "invalid tx DMA channel\n");
1016                         return -ENODEV;
1017                 }
1018                 mcbsp->dma_req[0] = res->start;
1019                 mcbsp->dma_data[0].filter_data = &mcbsp->dma_req[0];
1020
1021                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1022                 if (!res) {
1023                         dev_err(&pdev->dev, "invalid rx DMA channel\n");
1024                         return -ENODEV;
1025                 }
1026                 mcbsp->dma_req[1] = res->start;
1027                 mcbsp->dma_data[1].filter_data = &mcbsp->dma_req[1];
1028         } else {
1029                 mcbsp->dma_data[0].filter_data = "tx";
1030                 mcbsp->dma_data[1].filter_data = "rx";
1031         }
1032
1033         mcbsp->dma_data[0].addr = omap_mcbsp_dma_reg_params(mcbsp, 0);
1034         mcbsp->dma_data[0].maxburst = 4;
1035
1036         mcbsp->dma_data[1].addr = omap_mcbsp_dma_reg_params(mcbsp, 1);
1037         mcbsp->dma_data[1].maxburst = 4;
1038
1039         mcbsp->fclk = clk_get(&pdev->dev, "fck");
1040         if (IS_ERR(mcbsp->fclk)) {
1041                 ret = PTR_ERR(mcbsp->fclk);
1042                 dev_err(mcbsp->dev, "unable to get fck: %d\n", ret);
1043                 return ret;
1044         }
1045
1046         mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
1047         if (mcbsp->pdata->buffer_size) {
1048                 /*
1049                  * Initially configure the maximum thresholds to a safe value.
1050                  * The McBSP FIFO usage with these values should not go under
1051                  * 16 locations.
1052                  * If the whole FIFO without safety buffer is used, than there
1053                  * is a possibility that the DMA will be not able to push the
1054                  * new data on time, causing channel shifts in runtime.
1055                  */
1056                 mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
1057                 mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
1058
1059                 ret = sysfs_create_group(&mcbsp->dev->kobj,
1060                                          &additional_attr_group);
1061                 if (ret) {
1062                         dev_err(mcbsp->dev,
1063                                 "Unable to create additional controls\n");
1064                         goto err_thres;
1065                 }
1066         } else {
1067                 mcbsp->max_tx_thres = -EINVAL;
1068                 mcbsp->max_rx_thres = -EINVAL;
1069         }
1070
1071         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sidetone");
1072         if (res) {
1073                 ret = omap_st_add(mcbsp, res);
1074                 if (ret) {
1075                         dev_err(mcbsp->dev,
1076                                 "Unable to create sidetone controls\n");
1077                         goto err_st;
1078                 }
1079         }
1080
1081         return 0;
1082
1083 err_st:
1084         if (mcbsp->pdata->buffer_size)
1085                 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1086 err_thres:
1087         clk_put(mcbsp->fclk);
1088         return ret;
1089 }
1090
1091 void omap_mcbsp_sysfs_remove(struct omap_mcbsp *mcbsp)
1092 {
1093         if (mcbsp->pdata->buffer_size)
1094                 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1095
1096         if (mcbsp->st_data)
1097                 sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
1098 }