arch/arm/plat-omap/mcbsp.c

   1 /*
   2  * linux/arch/arm/plat-omap/mcbsp.c
   3  *
   4  * Copyright (C) 2004 Nokia Corporation
   5  * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
   6  *
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Multichannel mode not supported.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22 #include <linux/delay.h>
  23 #include <linux/io.h>
  24 #include <linux/slab.h>
  25
  26 #include <plat/mcbsp.h>
  27 #include <plat/omap_device.h>
  28 #include <linux/pm_runtime.h>
  29
  30 /* XXX These "sideways" includes are a sign that something is wrong */
  31 #include "../mach-omap2/cm2xxx_3xxx.h"
  32 #include "../mach-omap2/cm-regbits-34xx.h"
  33
  34 struct omap_mcbsp **mcbsp_ptr;
  35 int omap_mcbsp_count, omap_mcbsp_cache_size;
  36
  37 static void omap_mcbsp_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
  38 {
  39         if (cpu_class_is_omap1()) {
  40                 ((u16 *)mcbsp->reg_cache)[reg / sizeof(u16)] = (u16)val;
  41                 __raw_writew((u16)val, mcbsp->io_base + reg);
  42         } else if (cpu_is_omap2420()) {
  43                 ((u16 *)mcbsp->reg_cache)[reg / sizeof(u32)] = (u16)val;
  44                 __raw_writew((u16)val, mcbsp->io_base + reg);
  45         } else {
  46                 ((u32 *)mcbsp->reg_cache)[reg / sizeof(u32)] = val;
  47                 __raw_writel(val, mcbsp->io_base + reg);
  48         }
  49 }
  50
  51 static int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
  52 {
  53         if (cpu_class_is_omap1()) {
  54                 return !from_cache ? __raw_readw(mcbsp->io_base + reg) :
  55                                 ((u16 *)mcbsp->reg_cache)[reg / sizeof(u16)];
  56         } else if (cpu_is_omap2420()) {
  57                 return !from_cache ? __raw_readw(mcbsp->io_base + reg) :
  58                                 ((u16 *)mcbsp->reg_cache)[reg / sizeof(u32)];
  59         } else {
  60                 return !from_cache ? __raw_readl(mcbsp->io_base + reg) :
  61                                 ((u32 *)mcbsp->reg_cache)[reg / sizeof(u32)];
  62         }
  63 }
  64
  65 #ifdef CONFIG_ARCH_OMAP3
  66 static void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
  67 {
  68         __raw_writel(val, mcbsp->st_data->io_base_st + reg);
  69 }
  70
  71 static int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
  72 {
  73         return __raw_readl(mcbsp->st_data->io_base_st + reg);
  74 }
  75 #endif
  76
  77 #define MCBSP_READ(mcbsp, reg) \
  78                 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0)
  79 #define MCBSP_WRITE(mcbsp, reg, val) \
  80                 omap_mcbsp_write(mcbsp, OMAP_MCBSP_REG_##reg, val)
  81 #define MCBSP_READ_CACHE(mcbsp, reg) \
  82                 omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 1)
  83
  84 #define MCBSP_ST_READ(mcbsp, reg) \
  85                         omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
  86 #define MCBSP_ST_WRITE(mcbsp, reg, val) \
  87                         omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
  88
  89 static void omap_mcbsp_dump_reg(u8 id)
  90 {
  91         struct omap_mcbsp *mcbsp = id_to_mcbsp_ptr(id);
  92
  93         dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
  94         dev_dbg(mcbsp->dev, "DRR2:  0x%04x\n",
  95                         MCBSP_READ(mcbsp, DRR2));
  96         dev_dbg(mcbsp->dev, "DRR1:  0x%04x\n",
  97                         MCBSP_READ(mcbsp, DRR1));
  98         dev_dbg(mcbsp->dev, "DXR2:  0x%04x\n",
  99                         MCBSP_READ(mcbsp, DXR2));
 100         dev_dbg(mcbsp->dev, "DXR1:  0x%04x\n",
 101                         MCBSP_READ(mcbsp, DXR1));
 102         dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
 103                         MCBSP_READ(mcbsp, SPCR2));
 104         dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
 105                         MCBSP_READ(mcbsp, SPCR1));
 106         dev_dbg(mcbsp->dev, "RCR2:  0x%04x\n",
 107                         MCBSP_READ(mcbsp, RCR2));
 108         dev_dbg(mcbsp->dev, "RCR1:  0x%04x\n",
 109                         MCBSP_READ(mcbsp, RCR1));
 110         dev_dbg(mcbsp->dev, "XCR2:  0x%04x\n",
 111                         MCBSP_READ(mcbsp, XCR2));
 112         dev_dbg(mcbsp->dev, "XCR1:  0x%04x\n",
 113                         MCBSP_READ(mcbsp, XCR1));
 114         dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
 115                         MCBSP_READ(mcbsp, SRGR2));
 116         dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
 117                         MCBSP_READ(mcbsp, SRGR1));
 118         dev_dbg(mcbsp->dev, "PCR0:  0x%04x\n",
 119                         MCBSP_READ(mcbsp, PCR0));
 120         dev_dbg(mcbsp->dev, "***********************\n");
 121 }
 122
 123 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
 124 {
 125         struct omap_mcbsp *mcbsp_tx = dev_id;
 126         u16 irqst_spcr2;
 127
 128         irqst_spcr2 = MCBSP_READ(mcbsp_tx, SPCR2);
 129         dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
 130
 131         if (irqst_spcr2 & XSYNC_ERR) {
 132                 dev_err(mcbsp_tx->dev, "TX Frame Sync Error! : 0x%x\n",
 133                         irqst_spcr2);
 134                 /* Writing zero to XSYNC_ERR clears the IRQ */
 135                 MCBSP_WRITE(mcbsp_tx, SPCR2, MCBSP_READ_CACHE(mcbsp_tx, SPCR2));
 136         }
 137
 138         return IRQ_HANDLED;
 139 }
 140
 141 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
 142 {
 143         struct omap_mcbsp *mcbsp_rx = dev_id;
 144         u16 irqst_spcr1;
 145
 146         irqst_spcr1 = MCBSP_READ(mcbsp_rx, SPCR1);
 147         dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
 148
 149         if (irqst_spcr1 & RSYNC_ERR) {
 150                 dev_err(mcbsp_rx->dev, "RX Frame Sync Error! : 0x%x\n",
 151                         irqst_spcr1);
 152                 /* Writing zero to RSYNC_ERR clears the IRQ */
 153                 MCBSP_WRITE(mcbsp_rx, SPCR1, MCBSP_READ_CACHE(mcbsp_rx, SPCR1));
 154         }
 155
 156         return IRQ_HANDLED;
 157 }
 158
 159 /*
 160  * omap_mcbsp_config simply write a config to the
 161  * appropriate McBSP.
 162  * You either call this function or set the McBSP registers
 163  * by yourself before calling omap_mcbsp_start().
 164  */
 165 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 166 {
 167         struct omap_mcbsp *mcbsp;
 168
 169         if (!omap_mcbsp_check_valid_id(id)) {
 170                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 171                 return;
 172         }
 173         mcbsp = id_to_mcbsp_ptr(id);
 174
 175         dev_dbg(mcbsp->dev, "Configuring McBSP%d  phys_base: 0x%08lx\n",
 176                         mcbsp->id, mcbsp->phys_base);
 177
 178         /* We write the given config */
 179         MCBSP_WRITE(mcbsp, SPCR2, config->spcr2);
 180         MCBSP_WRITE(mcbsp, SPCR1, config->spcr1);
 181         MCBSP_WRITE(mcbsp, RCR2, config->rcr2);
 182         MCBSP_WRITE(mcbsp, RCR1, config->rcr1);
 183         MCBSP_WRITE(mcbsp, XCR2, config->xcr2);
 184         MCBSP_WRITE(mcbsp, XCR1, config->xcr1);
 185         MCBSP_WRITE(mcbsp, SRGR2, config->srgr2);
 186         MCBSP_WRITE(mcbsp, SRGR1, config->srgr1);
 187         MCBSP_WRITE(mcbsp, MCR2, config->mcr2);
 188         MCBSP_WRITE(mcbsp, MCR1, config->mcr1);
 189         MCBSP_WRITE(mcbsp, PCR0, config->pcr0);
 190         if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
 191                 MCBSP_WRITE(mcbsp, XCCR, config->xccr);
 192                 MCBSP_WRITE(mcbsp, RCCR, config->rccr);
 193         }
 194 }
 195 EXPORT_SYMBOL(omap_mcbsp_config);
 196
 197 /**
 198  * omap_mcbsp_dma_params - returns the dma channel number
 199  * @id - mcbsp id
 200  * @stream - indicates the direction of data flow (rx or tx)
 201  *
 202  * Returns the dma channel number for the rx channel or tx channel
 203  * based on the value of @stream for the requested mcbsp given by @id
 204  */
 205 int omap_mcbsp_dma_ch_params(unsigned int id, unsigned int stream)
 206 {
 207         struct omap_mcbsp *mcbsp;
 208
 209         if (!omap_mcbsp_check_valid_id(id)) {
 210                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 211                 return -ENODEV;
 212         }
 213         mcbsp = id_to_mcbsp_ptr(id);
 214
 215         if (stream)
 216                 return mcbsp->dma_rx_sync;
 217         else
 218                 return mcbsp->dma_tx_sync;
 219 }
 220 EXPORT_SYMBOL(omap_mcbsp_dma_ch_params);
 221
 222 /**
 223  * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register
 224  * @id - mcbsp id
 225  * @stream - indicates the direction of data flow (rx or tx)
 226  *
 227  * Returns the address of mcbsp data transmit register or data receive register
 228  * to be used by DMA for transferring/receiving data based on the value of
 229  * @stream for the requested mcbsp given by @id
 230  */
 231 int omap_mcbsp_dma_reg_params(unsigned int id, unsigned int stream)
 232 {
 233         struct omap_mcbsp *mcbsp;
 234         int data_reg;
 235
 236         if (!omap_mcbsp_check_valid_id(id)) {
 237                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 238                 return -ENODEV;
 239         }
 240         mcbsp = id_to_mcbsp_ptr(id);
 241
 242         data_reg = mcbsp->phys_dma_base;
 243
 244         if (mcbsp->mcbsp_config_type < MCBSP_CONFIG_TYPE2) {
 245                 if (stream)
 246                         data_reg += OMAP_MCBSP_REG_DRR1;
 247                 else
 248                         data_reg += OMAP_MCBSP_REG_DXR1;
 249         } else {
 250                 if (stream)
 251                         data_reg += OMAP_MCBSP_REG_DRR;
 252                 else
 253                         data_reg += OMAP_MCBSP_REG_DXR;
 254         }
 255
 256         return data_reg;
 257 }
 258 EXPORT_SYMBOL(omap_mcbsp_dma_reg_params);
 259
 260 #ifdef CONFIG_ARCH_OMAP3
 261 static struct omap_device *find_omap_device_by_dev(struct device *dev)
 262 {
 263         struct platform_device *pdev = container_of(dev,
 264                                         struct platform_device, dev);
 265         return container_of(pdev, struct omap_device, pdev);
 266 }
 267
 268 static void omap_st_on(struct omap_mcbsp *mcbsp)
 269 {
 270         unsigned int w;
 271         struct omap_device *od;
 272
 273         od = find_omap_device_by_dev(mcbsp->dev);
 274
 275         /*
 276          * Sidetone uses McBSP ICLK - which must not idle when sidetones
 277          * are enabled or sidetones start sounding ugly.
 278          */
 279         w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
 280         w &= ~(1 << (mcbsp->id - 2));
 281         omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
 282
 283         /* Enable McBSP Sidetone */
 284         w = MCBSP_READ(mcbsp, SSELCR);
 285         MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
 286
 287         /* Enable Sidetone from Sidetone Core */
 288         w = MCBSP_ST_READ(mcbsp, SSELCR);
 289         MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
 290 }
 291
 292 static void omap_st_off(struct omap_mcbsp *mcbsp)
 293 {
 294         unsigned int w;
 295         struct omap_device *od;
 296
 297         od = find_omap_device_by_dev(mcbsp->dev);
 298
 299         w = MCBSP_ST_READ(mcbsp, SSELCR);
 300         MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
 301
 302         w = MCBSP_READ(mcbsp, SSELCR);
 303         MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
 304
 305         w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
 306         w |= 1 << (mcbsp->id - 2);
 307         omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
 308 }
 309
 310 static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
 311 {
 312         u16 val, i;
 313         struct omap_device *od;
 314
 315         od = find_omap_device_by_dev(mcbsp->dev);
 316
 317         val = MCBSP_ST_READ(mcbsp, SSELCR);
 318
 319         if (val & ST_COEFFWREN)
 320                 MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
 321
 322         MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
 323
 324         for (i = 0; i < 128; i++)
 325                 MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
 326
 327         i = 0;
 328
 329         val = MCBSP_ST_READ(mcbsp, SSELCR);
 330         while (!(val & ST_COEFFWRDONE) && (++i < 1000))
 331                 val = MCBSP_ST_READ(mcbsp, SSELCR);
 332
 333         MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
 334
 335         if (i == 1000)
 336                 dev_err(mcbsp->dev, "McBSP FIR load error!\n");
 337 }
 338
 339 static void omap_st_chgain(struct omap_mcbsp *mcbsp)
 340 {
 341         u16 w;
 342         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 343         struct omap_device *od;
 344
 345         od = find_omap_device_by_dev(mcbsp->dev);
 346
 347         w = MCBSP_ST_READ(mcbsp, SSELCR);
 348
 349         MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) | \
 350                       ST_CH1GAIN(st_data->ch1gain));
 351 }
 352
 353 int omap_st_set_chgain(unsigned int id, int channel, s16 chgain)
 354 {
 355         struct omap_mcbsp *mcbsp;
 356         struct omap_mcbsp_st_data *st_data;
 357         int ret = 0;
 358
 359         if (!omap_mcbsp_check_valid_id(id)) {
 360                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 361                 return -ENODEV;
 362         }
 363
 364         mcbsp = id_to_mcbsp_ptr(id);
 365         st_data = mcbsp->st_data;
 366
 367         if (!st_data)
 368                 return -ENOENT;
 369
 370         spin_lock_irq(&mcbsp->lock);
 371         if (channel == 0)
 372                 st_data->ch0gain = chgain;
 373         else if (channel == 1)
 374                 st_data->ch1gain = chgain;
 375         else
 376                 ret = -EINVAL;
 377
 378         if (st_data->enabled)
 379                 omap_st_chgain(mcbsp);
 380         spin_unlock_irq(&mcbsp->lock);
 381
 382         return ret;
 383 }
 384 EXPORT_SYMBOL(omap_st_set_chgain);
 385
 386 int omap_st_get_chgain(unsigned int id, int channel, s16 *chgain)
 387 {
 388         struct omap_mcbsp *mcbsp;
 389         struct omap_mcbsp_st_data *st_data;
 390         int ret = 0;
 391
 392         if (!omap_mcbsp_check_valid_id(id)) {
 393                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 394                 return -ENODEV;
 395         }
 396
 397         mcbsp = id_to_mcbsp_ptr(id);
 398         st_data = mcbsp->st_data;
 399
 400         if (!st_data)
 401                 return -ENOENT;
 402
 403         spin_lock_irq(&mcbsp->lock);
 404         if (channel == 0)
 405                 *chgain = st_data->ch0gain;
 406         else if (channel == 1)
 407                 *chgain = st_data->ch1gain;
 408         else
 409                 ret = -EINVAL;
 410         spin_unlock_irq(&mcbsp->lock);
 411
 412         return ret;
 413 }
 414 EXPORT_SYMBOL(omap_st_get_chgain);
 415
 416 static int omap_st_start(struct omap_mcbsp *mcbsp)
 417 {
 418         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 419
 420         if (st_data && st_data->enabled && !st_data->running) {
 421                 omap_st_fir_write(mcbsp, st_data->taps);
 422                 omap_st_chgain(mcbsp);
 423
 424                 if (!mcbsp->free) {
 425                         omap_st_on(mcbsp);
 426                         st_data->running = 1;
 427                 }
 428         }
 429
 430         return 0;
 431 }
 432
 433 int omap_st_enable(unsigned int id)
 434 {
 435         struct omap_mcbsp *mcbsp;
 436         struct omap_mcbsp_st_data *st_data;
 437
 438         if (!omap_mcbsp_check_valid_id(id)) {
 439                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 440                 return -ENODEV;
 441         }
 442
 443         mcbsp = id_to_mcbsp_ptr(id);
 444         st_data = mcbsp->st_data;
 445
 446         if (!st_data)
 447                 return -ENODEV;
 448
 449         spin_lock_irq(&mcbsp->lock);
 450         st_data->enabled = 1;
 451         omap_st_start(mcbsp);
 452         spin_unlock_irq(&mcbsp->lock);
 453
 454         return 0;
 455 }
 456 EXPORT_SYMBOL(omap_st_enable);
 457
 458 static int omap_st_stop(struct omap_mcbsp *mcbsp)
 459 {
 460         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
 461
 462         if (st_data && st_data->running) {
 463                 if (!mcbsp->free) {
 464                         omap_st_off(mcbsp);
 465                         st_data->running = 0;
 466                 }
 467         }
 468
 469         return 0;
 470 }
 471
 472 int omap_st_disable(unsigned int id)
 473 {
 474         struct omap_mcbsp *mcbsp;
 475         struct omap_mcbsp_st_data *st_data;
 476         int ret = 0;
 477
 478         if (!omap_mcbsp_check_valid_id(id)) {
 479                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 480                 return -ENODEV;
 481         }
 482
 483         mcbsp = id_to_mcbsp_ptr(id);
 484         st_data = mcbsp->st_data;
 485
 486         if (!st_data)
 487                 return -ENODEV;
 488
 489         spin_lock_irq(&mcbsp->lock);
 490         omap_st_stop(mcbsp);
 491         st_data->enabled = 0;
 492         spin_unlock_irq(&mcbsp->lock);
 493
 494         return ret;
 495 }
 496 EXPORT_SYMBOL(omap_st_disable);
 497
 498 int omap_st_is_enabled(unsigned int id)
 499 {
 500         struct omap_mcbsp *mcbsp;
 501         struct omap_mcbsp_st_data *st_data;
 502
 503         if (!omap_mcbsp_check_valid_id(id)) {
 504                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 505                 return -ENODEV;
 506         }
 507
 508         mcbsp = id_to_mcbsp_ptr(id);
 509         st_data = mcbsp->st_data;
 510
 511         if (!st_data)
 512                 return -ENODEV;
 513
 514
 515         return st_data->enabled;
 516 }
 517 EXPORT_SYMBOL(omap_st_is_enabled);
 518
 519 /*
 520  * omap_mcbsp_set_rx_threshold configures the transmit threshold in words.
 521  * The threshold parameter is 1 based, and it is converted (threshold - 1)
 522  * for the THRSH2 register.
 523  */
 524 void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
 525 {
 526         struct omap_mcbsp *mcbsp;
 527
 528         if (!cpu_is_omap34xx() && !cpu_is_omap44xx())
 529                 return;
 530
 531         if (!omap_mcbsp_check_valid_id(id)) {
 532                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 533                 return;
 534         }
 535         mcbsp = id_to_mcbsp_ptr(id);
 536
 537         if (threshold && threshold <= mcbsp->max_tx_thres)
 538                 MCBSP_WRITE(mcbsp, THRSH2, threshold - 1);
 539 }
 540 EXPORT_SYMBOL(omap_mcbsp_set_tx_threshold);
 541
 542 /*
 543  * omap_mcbsp_set_rx_threshold configures the receive threshold in words.
 544  * The threshold parameter is 1 based, and it is converted (threshold - 1)
 545  * for the THRSH1 register.
 546  */
 547 void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
 548 {
 549         struct omap_mcbsp *mcbsp;
 550
 551         if (!cpu_is_omap34xx() && !cpu_is_omap44xx())
 552                 return;
 553
 554         if (!omap_mcbsp_check_valid_id(id)) {
 555                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 556                 return;
 557         }
 558         mcbsp = id_to_mcbsp_ptr(id);
 559
 560         if (threshold && threshold <= mcbsp->max_rx_thres)
 561                 MCBSP_WRITE(mcbsp, THRSH1, threshold - 1);
 562 }
 563 EXPORT_SYMBOL(omap_mcbsp_set_rx_threshold);
 564
 565 /*
 566  * omap_mcbsp_get_max_tx_thres just return the current configured
 567  * maximum threshold for transmission
 568  */
 569 u16 omap_mcbsp_get_max_tx_threshold(unsigned int id)
 570 {
 571         struct omap_mcbsp *mcbsp;
 572
 573         if (!omap_mcbsp_check_valid_id(id)) {
 574                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 575                 return -ENODEV;
 576         }
 577         mcbsp = id_to_mcbsp_ptr(id);
 578
 579         return mcbsp->max_tx_thres;
 580 }
 581 EXPORT_SYMBOL(omap_mcbsp_get_max_tx_threshold);
 582
 583 /*
 584  * omap_mcbsp_get_max_rx_thres just return the current configured
 585  * maximum threshold for reception
 586  */
 587 u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
 588 {
 589         struct omap_mcbsp *mcbsp;
 590
 591         if (!omap_mcbsp_check_valid_id(id)) {
 592                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 593                 return -ENODEV;
 594         }
 595         mcbsp = id_to_mcbsp_ptr(id);
 596
 597         return mcbsp->max_rx_thres;
 598 }
 599 EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
 600
 601 u16 omap_mcbsp_get_fifo_size(unsigned int id)
 602 {
 603         struct omap_mcbsp *mcbsp;
 604
 605         if (!omap_mcbsp_check_valid_id(id)) {
 606                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 607                 return -ENODEV;
 608         }
 609         mcbsp = id_to_mcbsp_ptr(id);
 610
 611         return mcbsp->pdata->buffer_size;
 612 }
 613 EXPORT_SYMBOL(omap_mcbsp_get_fifo_size);
 614
 615 /*
 616  * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
 617  */
 618 u16 omap_mcbsp_get_tx_delay(unsigned int id)
 619 {
 620         struct omap_mcbsp *mcbsp;
 621         u16 buffstat;
 622
 623         if (!omap_mcbsp_check_valid_id(id)) {
 624                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 625                 return -ENODEV;
 626         }
 627         mcbsp = id_to_mcbsp_ptr(id);
 628
 629         /* Returns the number of free locations in the buffer */
 630         buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
 631
 632         /* Number of slots are different in McBSP ports */
 633         return mcbsp->pdata->buffer_size - buffstat;
 634 }
 635 EXPORT_SYMBOL(omap_mcbsp_get_tx_delay);
 636
 637 /*
 638  * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
 639  * to reach the threshold value (when the DMA will be triggered to read it)
 640  */
 641 u16 omap_mcbsp_get_rx_delay(unsigned int id)
 642 {
 643         struct omap_mcbsp *mcbsp;
 644         u16 buffstat, threshold;
 645
 646         if (!omap_mcbsp_check_valid_id(id)) {
 647                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 648                 return -ENODEV;
 649         }
 650         mcbsp = id_to_mcbsp_ptr(id);
 651
 652         /* Returns the number of used locations in the buffer */
 653         buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
 654         /* RX threshold */
 655         threshold = MCBSP_READ(mcbsp, THRSH1);
 656
 657         /* Return the number of location till we reach the threshold limit */
 658         if (threshold <= buffstat)
 659                 return 0;
 660         else
 661                 return threshold - buffstat;
 662 }
 663 EXPORT_SYMBOL(omap_mcbsp_get_rx_delay);
 664
 665 /*
 666  * omap_mcbsp_get_dma_op_mode just return the current configured
 667  * operating mode for the mcbsp channel
 668  */
 669 int omap_mcbsp_get_dma_op_mode(unsigned int id)
 670 {
 671         struct omap_mcbsp *mcbsp;
 672         int dma_op_mode;
 673
 674         if (!omap_mcbsp_check_valid_id(id)) {
 675                 printk(KERN_ERR "%s: Invalid id (%u)\n", __func__, id + 1);
 676                 return -ENODEV;
 677         }
 678         mcbsp = id_to_mcbsp_ptr(id);
 679
 680         dma_op_mode = mcbsp->dma_op_mode;
 681
 682         return dma_op_mode;
 683 }
 684 EXPORT_SYMBOL(omap_mcbsp_get_dma_op_mode);
 685
 686 static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp)
 687 {
 688         struct omap_device *od;
 689
 690         od = find_omap_device_by_dev(mcbsp->dev);
 691         /*
 692          * Enable wakup behavior, smart idle and all wakeups
 693          * REVISIT: some wakeups may be unnecessary
 694          */
 695         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 696                 MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN);
 697         }
 698 }
 699
 700 static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
 701 {
 702         struct omap_device *od;
 703
 704         od = find_omap_device_by_dev(mcbsp->dev);
 705
 706         /*
 707          * Disable wakup behavior, smart idle and all wakeups
 708          */
 709         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
 710                 /*
 711                  * HW bug workaround - If no_idle mode is taken, we need to
 712                  * go to smart_idle before going to always_idle, or the
 713                  * device will not hit retention anymore.
 714                  */
 715
 716                 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
 717         }
 718 }
 719 #else
 720 static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp) {}
 721 static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) {}
 722 static inline void omap_st_start(struct omap_mcbsp *mcbsp) {}
 723 static inline void omap_st_stop(struct omap_mcbsp *mcbsp) {}
 724 #endif
 725
 726 int omap_mcbsp_request(unsigned int id)
 727 {
 728         struct omap_mcbsp *mcbsp;
 729         void *reg_cache;
 730         int err;
 731
 732         if (!omap_mcbsp_check_valid_id(id)) {
 733                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 734                 return -ENODEV;
 735         }
 736         mcbsp = id_to_mcbsp_ptr(id);
 737
 738         reg_cache = kzalloc(omap_mcbsp_cache_size, GFP_KERNEL);
 739         if (!reg_cache) {
 740                 return -ENOMEM;
 741         }
 742
 743         spin_lock(&mcbsp->lock);
 744         if (!mcbsp->free) {
 745                 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
 746                         mcbsp->id);
 747                 err = -EBUSY;
 748                 goto err_kfree;
 749         }
 750
 751         mcbsp->free = false;
 752         mcbsp->reg_cache = reg_cache;
 753         spin_unlock(&mcbsp->lock);
 754
 755         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
 756                 mcbsp->pdata->ops->request(id);
 757
 758         pm_runtime_get_sync(mcbsp->dev);
 759
 760         /* Do procedure specific to omap34xx arch, if applicable */
 761         omap34xx_mcbsp_request(mcbsp);
 762
 763         /*
 764          * Make sure that transmitter, receiver and sample-rate generator are
 765          * not running before activating IRQs.
 766          */
 767         MCBSP_WRITE(mcbsp, SPCR1, 0);
 768         MCBSP_WRITE(mcbsp, SPCR2, 0);
 769
 770         err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
 771                                 0, "McBSP", (void *)mcbsp);
 772         if (err != 0) {
 773                 dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
 774                                 "for McBSP%d\n", mcbsp->tx_irq,
 775                                 mcbsp->id);
 776                 goto err_clk_disable;
 777         }
 778
 779         if (mcbsp->rx_irq) {
 780                 err = request_irq(mcbsp->rx_irq,
 781                                 omap_mcbsp_rx_irq_handler,
 782                                 0, "McBSP", (void *)mcbsp);
 783                 if (err != 0) {
 784                         dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
 785                                         "for McBSP%d\n", mcbsp->rx_irq,
 786                                         mcbsp->id);
 787                         goto err_free_irq;
 788                 }
 789         }
 790
 791         return 0;
 792 err_free_irq:
 793         free_irq(mcbsp->tx_irq, (void *)mcbsp);
 794 err_clk_disable:
 795         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 796                 mcbsp->pdata->ops->free(id);
 797
 798         /* Do procedure specific to omap34xx arch, if applicable */
 799         omap34xx_mcbsp_free(mcbsp);
 800
 801         pm_runtime_put_sync(mcbsp->dev);
 802
 803         spin_lock(&mcbsp->lock);
 804         mcbsp->free = true;
 805         mcbsp->reg_cache = NULL;
 806 err_kfree:
 807         spin_unlock(&mcbsp->lock);
 808         kfree(reg_cache);
 809
 810         return err;
 811 }
 812 EXPORT_SYMBOL(omap_mcbsp_request);
 813
 814 void omap_mcbsp_free(unsigned int id)
 815 {
 816         struct omap_mcbsp *mcbsp;
 817         void *reg_cache;
 818
 819         if (!omap_mcbsp_check_valid_id(id)) {
 820                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 821                 return;
 822         }
 823         mcbsp = id_to_mcbsp_ptr(id);
 824
 825         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 826                 mcbsp->pdata->ops->free(id);
 827
 828         /* Do procedure specific to omap34xx arch, if applicable */
 829         omap34xx_mcbsp_free(mcbsp);
 830
 831         pm_runtime_put_sync(mcbsp->dev);
 832
 833         if (mcbsp->rx_irq)
 834                 free_irq(mcbsp->rx_irq, (void *)mcbsp);
 835         free_irq(mcbsp->tx_irq, (void *)mcbsp);
 836
 837         reg_cache = mcbsp->reg_cache;
 838
 839         spin_lock(&mcbsp->lock);
 840         if (mcbsp->free)
 841                 dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
 842         else
 843                 mcbsp->free = true;
 844         mcbsp->reg_cache = NULL;
 845         spin_unlock(&mcbsp->lock);
 846
 847         if (reg_cache)
 848                 kfree(reg_cache);
 849 }
 850 EXPORT_SYMBOL(omap_mcbsp_free);
 851
 852 /*
 853  * Here we start the McBSP, by enabling transmitter, receiver or both.
 854  * If no transmitter or receiver is active prior calling, then sample-rate
 855  * generator and frame sync are started.
 856  */
 857 void omap_mcbsp_start(unsigned int id, int tx, int rx)
 858 {
 859         struct omap_mcbsp *mcbsp;
 860         int enable_srg = 0;
 861         u16 w;
 862
 863         if (!omap_mcbsp_check_valid_id(id)) {
 864                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 865                 return;
 866         }
 867         mcbsp = id_to_mcbsp_ptr(id);
 868
 869         if (cpu_is_omap34xx())
 870                 omap_st_start(mcbsp);
 871
 872         /* Only enable SRG, if McBSP is master */
 873         w = MCBSP_READ_CACHE(mcbsp, PCR0);
 874         if (w & (FSXM | FSRM | CLKXM | CLKRM))
 875                 enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
 876                                 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 877
 878         if (enable_srg) {
 879                 /* Start the sample generator */
 880                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 881                 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
 882         }
 883
 884         /* Enable transmitter and receiver */
 885         tx &= 1;
 886         w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 887         MCBSP_WRITE(mcbsp, SPCR2, w | tx);
 888
 889         rx &= 1;
 890         w = MCBSP_READ_CACHE(mcbsp, SPCR1);
 891         MCBSP_WRITE(mcbsp, SPCR1, w | rx);
 892
 893         /*
 894          * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
 895          * REVISIT: 100us may give enough time for two CLKSRG, however
 896          * due to some unknown PM related, clock gating etc. reason it
 897          * is now at 500us.
 898          */
 899         udelay(500);
 900
 901         if (enable_srg) {
 902                 /* Start frame sync */
 903                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 904                 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
 905         }
 906
 907         if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
 908                 /* Release the transmitter and receiver */
 909                 w = MCBSP_READ_CACHE(mcbsp, XCCR);
 910                 w &= ~(tx ? XDISABLE : 0);
 911                 MCBSP_WRITE(mcbsp, XCCR, w);
 912                 w = MCBSP_READ_CACHE(mcbsp, RCCR);
 913                 w &= ~(rx ? RDISABLE : 0);
 914                 MCBSP_WRITE(mcbsp, RCCR, w);
 915         }
 916
 917         /* Dump McBSP Regs */
 918         omap_mcbsp_dump_reg(id);
 919 }
 920 EXPORT_SYMBOL(omap_mcbsp_start);
 921
 922 void omap_mcbsp_stop(unsigned int id, int tx, int rx)
 923 {
 924         struct omap_mcbsp *mcbsp;
 925         int idle;
 926         u16 w;
 927
 928         if (!omap_mcbsp_check_valid_id(id)) {
 929                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 930                 return;
 931         }
 932
 933         mcbsp = id_to_mcbsp_ptr(id);
 934
 935         /* Reset transmitter */
 936         tx &= 1;
 937         if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
 938                 w = MCBSP_READ_CACHE(mcbsp, XCCR);
 939                 w |= (tx ? XDISABLE : 0);
 940                 MCBSP_WRITE(mcbsp, XCCR, w);
 941         }
 942         w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 943         MCBSP_WRITE(mcbsp, SPCR2, w & ~tx);
 944
 945         /* Reset receiver */
 946         rx &= 1;
 947         if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
 948                 w = MCBSP_READ_CACHE(mcbsp, RCCR);
 949                 w |= (rx ? RDISABLE : 0);
 950                 MCBSP_WRITE(mcbsp, RCCR, w);
 951         }
 952         w = MCBSP_READ_CACHE(mcbsp, SPCR1);
 953         MCBSP_WRITE(mcbsp, SPCR1, w & ~rx);
 954
 955         idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
 956                         MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 957
 958         if (idle) {
 959                 /* Reset the sample rate generator */
 960                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 961                 MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
 962         }
 963
 964         if (cpu_is_omap34xx())
 965                 omap_st_stop(mcbsp);
 966 }
 967 EXPORT_SYMBOL(omap_mcbsp_stop);
 968
 969 /*
 970  * The following functions are only required on an OMAP1-only build.
 971  * mach-omap2/mcbsp.c contains the real functions
 972  */
 973 #ifndef CONFIG_ARCH_OMAP2PLUS
 974 int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
 975 {
 976         WARN(1, "%s: should never be called on an OMAP1-only kernel\n",
 977              __func__);
 978         return -EINVAL;
 979 }
 980
 981 void omap2_mcbsp1_mux_clkr_src(u8 mux)
 982 {
 983         WARN(1, "%s: should never be called on an OMAP1-only kernel\n",
 984              __func__);
 985         return;
 986 }
 987
 988 void omap2_mcbsp1_mux_fsr_src(u8 mux)
 989 {
 990         WARN(1, "%s: should never be called on an OMAP1-only kernel\n",
 991              __func__);
 992         return;
 993 }
 994 #endif
 995
 996 #ifdef CONFIG_ARCH_OMAP3
 997 #define max_thres(m)                    (mcbsp->pdata->buffer_size)
 998 #define valid_threshold(m, val)         ((val) <= max_thres(m))
 999 #define THRESHOLD_PROP_BUILDER(prop)                                    \
1000 static ssize_t prop##_show(struct device *dev,                          \
1001                         struct device_attribute *attr, char *buf)       \
1002 {                                                                       \
1003         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);                \
1004                                                                         \
1005         return sprintf(buf, "%u\n", mcbsp->prop);                       \
1006 }                                                                       \
1007                                                                         \
1008 static ssize_t prop##_store(struct device *dev,                         \
1009                                 struct device_attribute *attr,          \
1010                                 const char *buf, size_t size)           \
1011 {                                                                       \
1012         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);                \
1013         unsigned long val;                                              \
1014         int status;                                                     \
1015                                                                         \
1016         status = strict_strtoul(buf, 0, &val);                          \
1017         if (status)                                                     \
1018                 return status;                                          \
1019                                                                         \
1020         if (!valid_threshold(mcbsp, val))                               \
1021                 return -EDOM;                                           \
1022                                                                         \
1023         mcbsp->prop = val;                                              \
1024         return size;                                                    \
1025 }                                                                       \
1026                                                                         \
1027 static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
1028
1029 THRESHOLD_PROP_BUILDER(max_tx_thres);
1030 THRESHOLD_PROP_BUILDER(max_rx_thres);
1031
1032 static const char *dma_op_modes[] = {
1033         "element", "threshold", "frame",
1034 };
1035
1036 static ssize_t dma_op_mode_show(struct device *dev,
1037                         struct device_attribute *attr, char *buf)
1038 {
1039         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
1040         int dma_op_mode, i = 0;
1041         ssize_t len = 0;
1042         const char * const *s;
1043
1044         dma_op_mode = mcbsp->dma_op_mode;
1045
1046         for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
1047                 if (dma_op_mode == i)
1048                         len += sprintf(buf + len, "[%s] ", *s);
1049                 else
1050                         len += sprintf(buf + len, "%s ", *s);
1051         }
1052         len += sprintf(buf + len, "\n");
1053
1054         return len;
1055 }
1056
1057 static ssize_t dma_op_mode_store(struct device *dev,
1058                                 struct device_attribute *attr,
1059                                 const char *buf, size_t size)
1060 {
1061         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
1062         const char * const *s;
1063         int i = 0;
1064
1065         for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++)
1066                 if (sysfs_streq(buf, *s))
1067                         break;
1068
1069         if (i == ARRAY_SIZE(dma_op_modes))
1070                 return -EINVAL;
1071
1072         spin_lock_irq(&mcbsp->lock);
1073         if (!mcbsp->free) {
1074                 size = -EBUSY;
1075                 goto unlock;
1076         }
1077         mcbsp->dma_op_mode = i;
1078
1079 unlock:
1080         spin_unlock_irq(&mcbsp->lock);
1081
1082         return size;
1083 }
1084
1085 static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
1086
1087 static ssize_t st_taps_show(struct device *dev,
1088                             struct device_attribute *attr, char *buf)
1089 {
1090         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
1091         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
1092         ssize_t status = 0;
1093         int i;
1094
1095         spin_lock_irq(&mcbsp->lock);
1096         for (i = 0; i < st_data->nr_taps; i++)
1097                 status += sprintf(&buf[status], (i ? ", %d" : "%d"),
1098                                   st_data->taps[i]);
1099         if (i)
1100                 status += sprintf(&buf[status], "\n");
1101         spin_unlock_irq(&mcbsp->lock);
1102
1103         return status;
1104 }
1105
1106 static ssize_t st_taps_store(struct device *dev,
1107                              struct device_attribute *attr,
1108                              const char *buf, size_t size)
1109 {
1110         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
1111         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
1112         int val, tmp, status, i = 0;
1113
1114         spin_lock_irq(&mcbsp->lock);
1115         memset(st_data->taps, 0, sizeof(st_data->taps));
1116         st_data->nr_taps = 0;
1117
1118         do {
1119                 status = sscanf(buf, "%d%n", &val, &tmp);
1120                 if (status < 0 || status == 0) {
1121                         size = -EINVAL;
1122                         goto out;
1123                 }
1124                 if (val < -32768 || val > 32767) {
1125                         size = -EINVAL;
1126                         goto out;
1127                 }
1128                 st_data->taps[i++] = val;
1129                 buf += tmp;
1130                 if (*buf != ',')
1131                         break;
1132                 buf++;
1133         } while (1);
1134
1135         st_data->nr_taps = i;
1136
1137 out:
1138         spin_unlock_irq(&mcbsp->lock);
1139
1140         return size;
1141 }
1142
1143 static DEVICE_ATTR(st_taps, 0644, st_taps_show, st_taps_store);
1144
1145 static const struct attribute *additional_attrs[] = {
1146         &dev_attr_max_tx_thres.attr,
1147         &dev_attr_max_rx_thres.attr,
1148         &dev_attr_dma_op_mode.attr,
1149         NULL,
1150 };
1151
1152 static const struct attribute_group additional_attr_group = {
1153         .attrs = (struct attribute **)additional_attrs,
1154 };
1155
1156 static inline int __devinit omap_additional_add(struct device *dev)
1157 {
1158         return sysfs_create_group(&dev->kobj, &additional_attr_group);
1159 }
1160
1161 static inline void __devexit omap_additional_remove(struct device *dev)
1162 {
1163         sysfs_remove_group(&dev->kobj, &additional_attr_group);
1164 }
1165
1166 static const struct attribute *sidetone_attrs[] = {
1167         &dev_attr_st_taps.attr,
1168         NULL,
1169 };
1170
1171 static const struct attribute_group sidetone_attr_group = {
1172         .attrs = (struct attribute **)sidetone_attrs,
1173 };
1174
1175 static int __devinit omap_st_add(struct omap_mcbsp *mcbsp)
1176 {
1177         struct platform_device *pdev;
1178         struct resource *res;
1179         struct omap_mcbsp_st_data *st_data;
1180         int err;
1181
1182         st_data = kzalloc(sizeof(*mcbsp->st_data), GFP_KERNEL);
1183         if (!st_data) {
1184                 err = -ENOMEM;
1185                 goto err1;
1186         }
1187
1188         pdev = container_of(mcbsp->dev, struct platform_device, dev);
1189
1190         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sidetone");
1191         st_data->io_base_st = ioremap(res->start, resource_size(res));
1192         if (!st_data->io_base_st) {
1193                 err = -ENOMEM;
1194                 goto err2;
1195         }
1196
1197         err = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
1198         if (err)
1199                 goto err3;
1200
1201         mcbsp->st_data = st_data;
1202         return 0;
1203
1204 err3:
1205         iounmap(st_data->io_base_st);
1206 err2:
1207         kfree(st_data);
1208 err1:
1209         return err;
1210
1211 }
1212
1213 static void __devexit omap_st_remove(struct omap_mcbsp *mcbsp)
1214 {
1215         struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
1216
1217         if (st_data) {
1218                 sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
1219                 iounmap(st_data->io_base_st);
1220                 kfree(st_data);
1221         }
1222 }
1223
1224 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
1225 {
1226         mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
1227         if (cpu_is_omap34xx()) {
1228                 /*
1229                  * Initially configure the maximum thresholds to a safe value.
1230                  * The McBSP FIFO usage with these values should not go under
1231                  * 16 locations.
1232                  * If the whole FIFO without safety buffer is used, than there
1233                  * is a possibility that the DMA will be not able to push the
1234                  * new data on time, causing channel shifts in runtime.
1235                  */
1236                 mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
1237                 mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
1238                 /*
1239                  * REVISIT: Set dmap_op_mode to THRESHOLD as default
1240                  * for mcbsp2 instances.
1241                  */
1242                 if (omap_additional_add(mcbsp->dev))
1243                         dev_warn(mcbsp->dev,
1244                                 "Unable to create additional controls\n");
1245
1246                 if (mcbsp->id == 2 || mcbsp->id == 3)
1247                         if (omap_st_add(mcbsp))
1248                                 dev_warn(mcbsp->dev,
1249                                  "Unable to create sidetone controls\n");
1250
1251         } else {
1252                 mcbsp->max_tx_thres = -EINVAL;
1253                 mcbsp->max_rx_thres = -EINVAL;
1254         }
1255 }
1256
1257 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp)
1258 {
1259         if (cpu_is_omap34xx()) {
1260                 omap_additional_remove(mcbsp->dev);
1261
1262                 if (mcbsp->id == 2 || mcbsp->id == 3)
1263                         omap_st_remove(mcbsp);
1264         }
1265 }
1266 #else
1267 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp) {}
1268 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp) {}
1269 #endif /* CONFIG_ARCH_OMAP3 */
1270
1271 /*
1272  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
1273  * 730 has only 2 McBSP, and both of them are MPU peripherals.
1274  */
1275 static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
1276 {
1277         struct omap_mcbsp_platform_data *pdata = pdev->dev.platform_data;
1278         struct omap_mcbsp *mcbsp;
1279         int id = pdev->id - 1;
1280         struct resource *res;
1281         int ret = 0;
1282
1283         if (!pdata) {
1284                 dev_err(&pdev->dev, "McBSP device initialized without"
1285                                 "platform data\n");
1286                 ret = -EINVAL;
1287                 goto exit;
1288         }
1289
1290         dev_dbg(&pdev->dev, "Initializing OMAP McBSP (%d).\n", pdev->id);
1291
1292         if (id >= omap_mcbsp_count) {
1293                 dev_err(&pdev->dev, "Invalid McBSP device id (%d)\n", id);
1294                 ret = -EINVAL;
1295                 goto exit;
1296         }
1297
1298         mcbsp = kzalloc(sizeof(struct omap_mcbsp), GFP_KERNEL);
1299         if (!mcbsp) {
1300                 ret = -ENOMEM;
1301                 goto exit;
1302         }
1303
1304         spin_lock_init(&mcbsp->lock);
1305         mcbsp->id = id + 1;
1306         mcbsp->free = true;
1307
1308         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
1309         if (!res) {
1310                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1311                 if (!res) {
1312                         dev_err(&pdev->dev, "%s:mcbsp%d has invalid memory"
1313                                         "resource\n", __func__, pdev->id);
1314                         ret = -ENOMEM;
1315                         goto exit;
1316                 }
1317         }
1318         mcbsp->phys_base = res->start;
1319         omap_mcbsp_cache_size = resource_size(res);
1320         mcbsp->io_base = ioremap(res->start, resource_size(res));
1321         if (!mcbsp->io_base) {
1322                 ret = -ENOMEM;
1323                 goto err_ioremap;
1324         }
1325
1326         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
1327         if (!res)
1328                 mcbsp->phys_dma_base = mcbsp->phys_base;
1329         else
1330                 mcbsp->phys_dma_base = res->start;
1331
1332         mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx");
1333         mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx");
1334
1335         /* From OMAP4 there will be a single irq line */
1336         if (mcbsp->tx_irq == -ENXIO)
1337                 mcbsp->tx_irq = platform_get_irq(pdev, 0);
1338
1339         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
1340         if (!res) {
1341                 dev_err(&pdev->dev, "%s:mcbsp%d has invalid rx DMA channel\n",
1342                                         __func__, pdev->id);
1343                 ret = -ENODEV;
1344                 goto err_res;
1345         }
1346         mcbsp->dma_rx_sync = res->start;
1347
1348         res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
1349         if (!res) {
1350                 dev_err(&pdev->dev, "%s:mcbsp%d has invalid tx DMA channel\n",
1351                                         __func__, pdev->id);
1352                 ret = -ENODEV;
1353                 goto err_res;
1354         }
1355         mcbsp->dma_tx_sync = res->start;
1356
1357         mcbsp->fclk = clk_get(&pdev->dev, "fck");
1358         if (IS_ERR(mcbsp->fclk)) {
1359                 ret = PTR_ERR(mcbsp->fclk);
1360                 dev_err(&pdev->dev, "unable to get fck: %d\n", ret);
1361                 goto err_res;
1362         }
1363
1364         mcbsp->pdata = pdata;
1365         mcbsp->dev = &pdev->dev;
1366         mcbsp_ptr[id] = mcbsp;
1367         mcbsp->mcbsp_config_type = pdata->mcbsp_config_type;
1368         platform_set_drvdata(pdev, mcbsp);
1369         pm_runtime_enable(mcbsp->dev);
1370
1371         /* Initialize mcbsp properties for OMAP34XX if needed / applicable */
1372         omap34xx_device_init(mcbsp);
1373
1374         return 0;
1375
1376 err_res:
1377         iounmap(mcbsp->io_base);
1378 err_ioremap:
1379         kfree(mcbsp);
1380 exit:
1381         return ret;
1382 }
1383
1384 static int __devexit omap_mcbsp_remove(struct platform_device *pdev)
1385 {
1386         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
1387
1388         platform_set_drvdata(pdev, NULL);
1389         if (mcbsp) {
1390
1391                 if (mcbsp->pdata && mcbsp->pdata->ops &&
1392                                 mcbsp->pdata->ops->free)
1393                         mcbsp->pdata->ops->free(mcbsp->id);
1394
1395                 omap34xx_device_exit(mcbsp);
1396
1397                 clk_put(mcbsp->fclk);
1398
1399                 iounmap(mcbsp->io_base);
1400                 kfree(mcbsp);
1401         }
1402
1403         return 0;
1404 }
1405
1406 static struct platform_driver omap_mcbsp_driver = {
1407         .probe          = omap_mcbsp_probe,
1408         .remove         = __devexit_p(omap_mcbsp_remove),
1409         .driver         = {
1410                 .name   = "omap-mcbsp",
1411         },
1412 };
1413
1414 int __init omap_mcbsp_init(void)
1415 {
1416         /* Register the McBSP driver */
1417         return platform_driver_register(&omap_mcbsp_driver);
1418 }