sound/soc/ti/omap-mcbsp.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
omap_mcbsp_dump_reg
omap2_mcbsp_set_clks_src
omap_mcbsp_irq_handler
omap_mcbsp_tx_irq_handler
omap_mcbsp_rx_irq_handler
omap_mcbsp_config
omap_mcbsp_dma_reg_params
omap_mcbsp_set_tx_threshold
omap_mcbsp_set_rx_threshold
omap_mcbsp_get_tx_delay
omap_mcbsp_get_rx_delay
omap_mcbsp_request
omap_mcbsp_free
omap_mcbsp_start
omap_mcbsp_stop
dma_op_mode_show
dma_op_mode_store
omap_mcbsp_init
omap_mcbsp_set_threshold
omap_mcbsp_hwrule_min_buffersize
omap_mcbsp_dai_startup
omap_mcbsp_dai_shutdown
omap_mcbsp_dai_prepare
omap_mcbsp_dai_trigger
omap_mcbsp_dai_delay
omap_mcbsp_dai_hw_params
omap_mcbsp_dai_set_dai_fmt
omap_mcbsp_dai_set_clkdiv
omap_mcbsp_dai_set_dai_sysclk
omap_mcbsp_probe
omap_mcbsp_remove
asoc_mcbsp_probe
asoc_mcbsp_remove
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * omap-mcbsp.c  --  OMAP ALSA SoC DAI driver using McBSP port
   4  *
   5  * Copyright (C) 2008 Nokia Corporation
   6  *
   7  * Contact: Jarkko Nikula <jarkko.nikula@bitmer.com>
   8  *          Peter Ujfalusi <peter.ujfalusi@ti.com>
   9  */
  10 
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/pm_runtime.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <sound/core.h>
  18 #include <sound/pcm.h>
  19 #include <sound/pcm_params.h>
  20 #include <sound/initval.h>
  21 #include <sound/soc.h>
  22 #include <sound/dmaengine_pcm.h>
  23 
  24 #include "omap-mcbsp-priv.h"
  25 #include "omap-mcbsp.h"
  26 #include "sdma-pcm.h"
  27 
  28 #define OMAP_MCBSP_RATES        (SNDRV_PCM_RATE_8000_96000)
  29 
  30 enum {
  31         OMAP_MCBSP_WORD_8 = 0,
  32         OMAP_MCBSP_WORD_12,
  33         OMAP_MCBSP_WORD_16,
  34         OMAP_MCBSP_WORD_20,
  35         OMAP_MCBSP_WORD_24,
  36         OMAP_MCBSP_WORD_32,
  37 };
  38 
  39 static void omap_mcbsp_dump_reg(struct omap_mcbsp *mcbsp)
  40 {
  41         dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
  42         dev_dbg(mcbsp->dev, "DRR2:  0x%04x\n", MCBSP_READ(mcbsp, DRR2));
  43         dev_dbg(mcbsp->dev, "DRR1:  0x%04x\n", MCBSP_READ(mcbsp, DRR1));
  44         dev_dbg(mcbsp->dev, "DXR2:  0x%04x\n", MCBSP_READ(mcbsp, DXR2));
  45         dev_dbg(mcbsp->dev, "DXR1:  0x%04x\n", MCBSP_READ(mcbsp, DXR1));
  46         dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n", MCBSP_READ(mcbsp, SPCR2));
  47         dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n", MCBSP_READ(mcbsp, SPCR1));
  48         dev_dbg(mcbsp->dev, "RCR2:  0x%04x\n", MCBSP_READ(mcbsp, RCR2));
  49         dev_dbg(mcbsp->dev, "RCR1:  0x%04x\n", MCBSP_READ(mcbsp, RCR1));
  50         dev_dbg(mcbsp->dev, "XCR2:  0x%04x\n", MCBSP_READ(mcbsp, XCR2));
  51         dev_dbg(mcbsp->dev, "XCR1:  0x%04x\n", MCBSP_READ(mcbsp, XCR1));
  52         dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n", MCBSP_READ(mcbsp, SRGR2));
  53         dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n", MCBSP_READ(mcbsp, SRGR1));
  54         dev_dbg(mcbsp->dev, "PCR0:  0x%04x\n", MCBSP_READ(mcbsp, PCR0));
  55         dev_dbg(mcbsp->dev, "***********************\n");
  56 }
  57 
  58 static int omap2_mcbsp_set_clks_src(struct omap_mcbsp *mcbsp, u8 fck_src_id)
  59 {
  60         struct clk *fck_src;
  61         const char *src;
  62         int r;
  63 
  64         if (fck_src_id == MCBSP_CLKS_PAD_SRC)
  65                 src = "pad_fck";
  66         else if (fck_src_id == MCBSP_CLKS_PRCM_SRC)
  67                 src = "prcm_fck";
  68         else
  69                 return -EINVAL;
  70 
  71         fck_src = clk_get(mcbsp->dev, src);
  72         if (IS_ERR(fck_src)) {
  73                 dev_err(mcbsp->dev, "CLKS: could not clk_get() %s\n", src);
  74                 return -EINVAL;
  75         }
  76 
  77         pm_runtime_put_sync(mcbsp->dev);
  78 
  79         r = clk_set_parent(mcbsp->fclk, fck_src);
  80         if (r) {
  81                 dev_err(mcbsp->dev, "CLKS: could not clk_set_parent() to %s\n",
  82                         src);
  83                 clk_put(fck_src);
  84                 return r;
  85         }
  86 
  87         pm_runtime_get_sync(mcbsp->dev);
  88 
  89         clk_put(fck_src);
  90 
  91         return 0;
  92 }
  93 
  94 static irqreturn_t omap_mcbsp_irq_handler(int irq, void *data)
  95 {
  96         struct omap_mcbsp *mcbsp = data;
  97         u16 irqst;
  98 
  99         irqst = MCBSP_READ(mcbsp, IRQST);
 100         dev_dbg(mcbsp->dev, "IRQ callback : 0x%x\n", irqst);
 101 
 102         if (irqst & RSYNCERREN)
 103                 dev_err(mcbsp->dev, "RX Frame Sync Error!\n");
 104         if (irqst & RFSREN)
 105                 dev_dbg(mcbsp->dev, "RX Frame Sync\n");
 106         if (irqst & REOFEN)
 107                 dev_dbg(mcbsp->dev, "RX End Of Frame\n");
 108         if (irqst & RRDYEN)
 109                 dev_dbg(mcbsp->dev, "RX Buffer Threshold Reached\n");
 110         if (irqst & RUNDFLEN)
 111                 dev_err(mcbsp->dev, "RX Buffer Underflow!\n");
 112         if (irqst & ROVFLEN)
 113                 dev_err(mcbsp->dev, "RX Buffer Overflow!\n");
 114 
 115         if (irqst & XSYNCERREN)
 116                 dev_err(mcbsp->dev, "TX Frame Sync Error!\n");
 117         if (irqst & XFSXEN)
 118                 dev_dbg(mcbsp->dev, "TX Frame Sync\n");
 119         if (irqst & XEOFEN)
 120                 dev_dbg(mcbsp->dev, "TX End Of Frame\n");
 121         if (irqst & XRDYEN)
 122                 dev_dbg(mcbsp->dev, "TX Buffer threshold Reached\n");
 123         if (irqst & XUNDFLEN)
 124                 dev_err(mcbsp->dev, "TX Buffer Underflow!\n");
 125         if (irqst & XOVFLEN)
 126                 dev_err(mcbsp->dev, "TX Buffer Overflow!\n");
 127         if (irqst & XEMPTYEOFEN)
 128                 dev_dbg(mcbsp->dev, "TX Buffer empty at end of frame\n");
 129 
 130         MCBSP_WRITE(mcbsp, IRQST, irqst);
 131 
 132         return IRQ_HANDLED;
 133 }
 134 
 135 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *data)
 136 {
 137         struct omap_mcbsp *mcbsp = data;
 138         u16 irqst_spcr2;
 139 
 140         irqst_spcr2 = MCBSP_READ(mcbsp, SPCR2);
 141         dev_dbg(mcbsp->dev, "TX IRQ callback : 0x%x\n", irqst_spcr2);
 142 
 143         if (irqst_spcr2 & XSYNC_ERR) {
 144                 dev_err(mcbsp->dev, "TX Frame Sync Error! : 0x%x\n",
 145                         irqst_spcr2);
 146                 /* Writing zero to XSYNC_ERR clears the IRQ */
 147                 MCBSP_WRITE(mcbsp, SPCR2, MCBSP_READ_CACHE(mcbsp, SPCR2));
 148         }
 149 
 150         return IRQ_HANDLED;
 151 }
 152 
 153 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *data)
 154 {
 155         struct omap_mcbsp *mcbsp = data;
 156         u16 irqst_spcr1;
 157 
 158         irqst_spcr1 = MCBSP_READ(mcbsp, SPCR1);
 159         dev_dbg(mcbsp->dev, "RX IRQ callback : 0x%x\n", irqst_spcr1);
 160 
 161         if (irqst_spcr1 & RSYNC_ERR) {
 162                 dev_err(mcbsp->dev, "RX Frame Sync Error! : 0x%x\n",
 163                         irqst_spcr1);
 164                 /* Writing zero to RSYNC_ERR clears the IRQ */
 165                 MCBSP_WRITE(mcbsp, SPCR1, MCBSP_READ_CACHE(mcbsp, SPCR1));
 166         }
 167 
 168         return IRQ_HANDLED;
 169 }
 170 
 171 /*
 172  * omap_mcbsp_config simply write a config to the
 173  * appropriate McBSP.
 174  * You either call this function or set the McBSP registers
 175  * by yourself before calling omap_mcbsp_start().
 176  */
 177 static void omap_mcbsp_config(struct omap_mcbsp *mcbsp,
 178                               const struct omap_mcbsp_reg_cfg *config)
 179 {
 180         dev_dbg(mcbsp->dev, "Configuring McBSP%d  phys_base: 0x%08lx\n",
 181                 mcbsp->id, mcbsp->phys_base);
 182 
 183         /* We write the given config */
 184         MCBSP_WRITE(mcbsp, SPCR2, config->spcr2);
 185         MCBSP_WRITE(mcbsp, SPCR1, config->spcr1);
 186         MCBSP_WRITE(mcbsp, RCR2, config->rcr2);
 187         MCBSP_WRITE(mcbsp, RCR1, config->rcr1);
 188         MCBSP_WRITE(mcbsp, XCR2, config->xcr2);
 189         MCBSP_WRITE(mcbsp, XCR1, config->xcr1);
 190         MCBSP_WRITE(mcbsp, SRGR2, config->srgr2);
 191         MCBSP_WRITE(mcbsp, SRGR1, config->srgr1);
 192         MCBSP_WRITE(mcbsp, MCR2, config->mcr2);
 193         MCBSP_WRITE(mcbsp, MCR1, config->mcr1);
 194         MCBSP_WRITE(mcbsp, PCR0, config->pcr0);
 195         if (mcbsp->pdata->has_ccr) {
 196                 MCBSP_WRITE(mcbsp, XCCR, config->xccr);
 197                 MCBSP_WRITE(mcbsp, RCCR, config->rccr);
 198         }
 199         /* Enable wakeup behavior */
 200         if (mcbsp->pdata->has_wakeup)
 201                 MCBSP_WRITE(mcbsp, WAKEUPEN, XRDYEN | RRDYEN);
 202 
 203         /* Enable TX/RX sync error interrupts by default */
 204         if (mcbsp->irq)
 205                 MCBSP_WRITE(mcbsp, IRQEN, RSYNCERREN | XSYNCERREN |
 206                             RUNDFLEN | ROVFLEN | XUNDFLEN | XOVFLEN);
 207 }
 208 
 209 /**
 210  * omap_mcbsp_dma_reg_params - returns the address of mcbsp data register
 211  * @mcbsp: omap_mcbsp struct for the McBSP instance
 212  * @stream: Stream direction (playback/capture)
 213  *
 214  * Returns the address of mcbsp data transmit register or data receive register
 215  * to be used by DMA for transferring/receiving data
 216  */
 217 static int omap_mcbsp_dma_reg_params(struct omap_mcbsp *mcbsp,
 218                                      unsigned int stream)
 219 {
 220         int data_reg;
 221 
 222         if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
 223                 if (mcbsp->pdata->reg_size == 2)
 224                         data_reg = OMAP_MCBSP_REG_DXR1;
 225                 else
 226                         data_reg = OMAP_MCBSP_REG_DXR;
 227         } else {
 228                 if (mcbsp->pdata->reg_size == 2)
 229                         data_reg = OMAP_MCBSP_REG_DRR1;
 230                 else
 231                         data_reg = OMAP_MCBSP_REG_DRR;
 232         }
 233 
 234         return mcbsp->phys_dma_base + data_reg * mcbsp->pdata->reg_step;
 235 }
 236 
 237 /*
 238  * omap_mcbsp_set_rx_threshold configures the transmit threshold in words.
 239  * The threshold parameter is 1 based, and it is converted (threshold - 1)
 240  * for the THRSH2 register.
 241  */
 242 static void omap_mcbsp_set_tx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
 243 {
 244         if (threshold && threshold <= mcbsp->max_tx_thres)
 245                 MCBSP_WRITE(mcbsp, THRSH2, threshold - 1);
 246 }
 247 
 248 /*
 249  * omap_mcbsp_set_rx_threshold configures the receive threshold in words.
 250  * The threshold parameter is 1 based, and it is converted (threshold - 1)
 251  * for the THRSH1 register.
 252  */
 253 static void omap_mcbsp_set_rx_threshold(struct omap_mcbsp *mcbsp, u16 threshold)
 254 {
 255         if (threshold && threshold <= mcbsp->max_rx_thres)
 256                 MCBSP_WRITE(mcbsp, THRSH1, threshold - 1);
 257 }
 258 
 259 /*
 260  * omap_mcbsp_get_tx_delay returns the number of used slots in the McBSP FIFO
 261  */
 262 static u16 omap_mcbsp_get_tx_delay(struct omap_mcbsp *mcbsp)
 263 {
 264         u16 buffstat;
 265 
 266         /* Returns the number of free locations in the buffer */
 267         buffstat = MCBSP_READ(mcbsp, XBUFFSTAT);
 268 
 269         /* Number of slots are different in McBSP ports */
 270         return mcbsp->pdata->buffer_size - buffstat;
 271 }
 272 
 273 /*
 274  * omap_mcbsp_get_rx_delay returns the number of free slots in the McBSP FIFO
 275  * to reach the threshold value (when the DMA will be triggered to read it)
 276  */
 277 static u16 omap_mcbsp_get_rx_delay(struct omap_mcbsp *mcbsp)
 278 {
 279         u16 buffstat, threshold;
 280 
 281         /* Returns the number of used locations in the buffer */
 282         buffstat = MCBSP_READ(mcbsp, RBUFFSTAT);
 283         /* RX threshold */
 284         threshold = MCBSP_READ(mcbsp, THRSH1);
 285 
 286         /* Return the number of location till we reach the threshold limit */
 287         if (threshold <= buffstat)
 288                 return 0;
 289         else
 290                 return threshold - buffstat;
 291 }
 292 
 293 static int omap_mcbsp_request(struct omap_mcbsp *mcbsp)
 294 {
 295         void *reg_cache;
 296         int err;
 297 
 298         reg_cache = kzalloc(mcbsp->reg_cache_size, GFP_KERNEL);
 299         if (!reg_cache)
 300                 return -ENOMEM;
 301 
 302         spin_lock(&mcbsp->lock);
 303         if (!mcbsp->free) {
 304                 dev_err(mcbsp->dev, "McBSP%d is currently in use\n", mcbsp->id);
 305                 err = -EBUSY;
 306                 goto err_kfree;
 307         }
 308 
 309         mcbsp->free = false;
 310         mcbsp->reg_cache = reg_cache;
 311         spin_unlock(&mcbsp->lock);
 312 
 313         if(mcbsp->pdata->ops && mcbsp->pdata->ops->request)
 314                 mcbsp->pdata->ops->request(mcbsp->id - 1);
 315 
 316         /*
 317          * Make sure that transmitter, receiver and sample-rate generator are
 318          * not running before activating IRQs.
 319          */
 320         MCBSP_WRITE(mcbsp, SPCR1, 0);
 321         MCBSP_WRITE(mcbsp, SPCR2, 0);
 322 
 323         if (mcbsp->irq) {
 324                 err = request_irq(mcbsp->irq, omap_mcbsp_irq_handler, 0,
 325                                   "McBSP", (void *)mcbsp);
 326                 if (err != 0) {
 327                         dev_err(mcbsp->dev, "Unable to request IRQ\n");
 328                         goto err_clk_disable;
 329                 }
 330         } else {
 331                 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler, 0,
 332                                   "McBSP TX", (void *)mcbsp);
 333                 if (err != 0) {
 334                         dev_err(mcbsp->dev, "Unable to request TX IRQ\n");
 335                         goto err_clk_disable;
 336                 }
 337 
 338                 err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler, 0,
 339                                   "McBSP RX", (void *)mcbsp);
 340                 if (err != 0) {
 341                         dev_err(mcbsp->dev, "Unable to request RX IRQ\n");
 342                         goto err_free_irq;
 343                 }
 344         }
 345 
 346         return 0;
 347 err_free_irq:
 348         free_irq(mcbsp->tx_irq, (void *)mcbsp);
 349 err_clk_disable:
 350         if(mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 351                 mcbsp->pdata->ops->free(mcbsp->id - 1);
 352 
 353         /* Disable wakeup behavior */
 354         if (mcbsp->pdata->has_wakeup)
 355                 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
 356 
 357         spin_lock(&mcbsp->lock);
 358         mcbsp->free = true;
 359         mcbsp->reg_cache = NULL;
 360 err_kfree:
 361         spin_unlock(&mcbsp->lock);
 362         kfree(reg_cache);
 363 
 364         return err;
 365 }
 366 
 367 static void omap_mcbsp_free(struct omap_mcbsp *mcbsp)
 368 {
 369         void *reg_cache;
 370 
 371         if(mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 372                 mcbsp->pdata->ops->free(mcbsp->id - 1);
 373 
 374         /* Disable wakeup behavior */
 375         if (mcbsp->pdata->has_wakeup)
 376                 MCBSP_WRITE(mcbsp, WAKEUPEN, 0);
 377 
 378         /* Disable interrupt requests */
 379         if (mcbsp->irq)
 380                 MCBSP_WRITE(mcbsp, IRQEN, 0);
 381 
 382         if (mcbsp->irq) {
 383                 free_irq(mcbsp->irq, (void *)mcbsp);
 384         } else {
 385                 free_irq(mcbsp->rx_irq, (void *)mcbsp);
 386                 free_irq(mcbsp->tx_irq, (void *)mcbsp);
 387         }
 388 
 389         reg_cache = mcbsp->reg_cache;
 390 
 391         /*
 392          * Select CLKS source from internal source unconditionally before
 393          * marking the McBSP port as free.
 394          * If the external clock source via MCBSP_CLKS pin has been selected the
 395          * system will refuse to enter idle if the CLKS pin source is not reset
 396          * back to internal source.
 397          */
 398         if (!mcbsp_omap1())
 399                 omap2_mcbsp_set_clks_src(mcbsp, MCBSP_CLKS_PRCM_SRC);
 400 
 401         spin_lock(&mcbsp->lock);
 402         if (mcbsp->free)
 403                 dev_err(mcbsp->dev, "McBSP%d was not reserved\n", mcbsp->id);
 404         else
 405                 mcbsp->free = true;
 406         mcbsp->reg_cache = NULL;
 407         spin_unlock(&mcbsp->lock);
 408 
 409         kfree(reg_cache);
 410 }
 411 
 412 /*
 413  * Here we start the McBSP, by enabling transmitter, receiver or both.
 414  * If no transmitter or receiver is active prior calling, then sample-rate
 415  * generator and frame sync are started.
 416  */
 417 static void omap_mcbsp_start(struct omap_mcbsp *mcbsp, int stream)
 418 {
 419         int tx = (stream == SNDRV_PCM_STREAM_PLAYBACK);
 420         int rx = !tx;
 421         int enable_srg = 0;
 422         u16 w;
 423 
 424         if (mcbsp->st_data)
 425                 omap_mcbsp_st_start(mcbsp);
 426 
 427         /* Only enable SRG, if McBSP is master */
 428         w = MCBSP_READ_CACHE(mcbsp, PCR0);
 429         if (w & (FSXM | FSRM | CLKXM | CLKRM))
 430                 enable_srg = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
 431                                 MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 432 
 433         if (enable_srg) {
 434                 /* Start the sample generator */
 435                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 436                 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 6));
 437         }
 438 
 439         /* Enable transmitter and receiver */
 440         tx &= 1;
 441         w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 442         MCBSP_WRITE(mcbsp, SPCR2, w | tx);
 443 
 444         rx &= 1;
 445         w = MCBSP_READ_CACHE(mcbsp, SPCR1);
 446         MCBSP_WRITE(mcbsp, SPCR1, w | rx);
 447 
 448         /*
 449          * Worst case: CLKSRG*2 = 8000khz: (1/8000) * 2 * 2 usec
 450          * REVISIT: 100us may give enough time for two CLKSRG, however
 451          * due to some unknown PM related, clock gating etc. reason it
 452          * is now at 500us.
 453          */
 454         udelay(500);
 455 
 456         if (enable_srg) {
 457                 /* Start frame sync */
 458                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 459                 MCBSP_WRITE(mcbsp, SPCR2, w | (1 << 7));
 460         }
 461 
 462         if (mcbsp->pdata->has_ccr) {
 463                 /* Release the transmitter and receiver */
 464                 w = MCBSP_READ_CACHE(mcbsp, XCCR);
 465                 w &= ~(tx ? XDISABLE : 0);
 466                 MCBSP_WRITE(mcbsp, XCCR, w);
 467                 w = MCBSP_READ_CACHE(mcbsp, RCCR);
 468                 w &= ~(rx ? RDISABLE : 0);
 469                 MCBSP_WRITE(mcbsp, RCCR, w);
 470         }
 471 
 472         /* Dump McBSP Regs */
 473         omap_mcbsp_dump_reg(mcbsp);
 474 }
 475 
 476 static void omap_mcbsp_stop(struct omap_mcbsp *mcbsp, int stream)
 477 {
 478         int tx = (stream == SNDRV_PCM_STREAM_PLAYBACK);
 479         int rx = !tx;
 480         int idle;
 481         u16 w;
 482 
 483         /* Reset transmitter */
 484         tx &= 1;
 485         if (mcbsp->pdata->has_ccr) {
 486                 w = MCBSP_READ_CACHE(mcbsp, XCCR);
 487                 w |= (tx ? XDISABLE : 0);
 488                 MCBSP_WRITE(mcbsp, XCCR, w);
 489         }
 490         w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 491         MCBSP_WRITE(mcbsp, SPCR2, w & ~tx);
 492 
 493         /* Reset receiver */
 494         rx &= 1;
 495         if (mcbsp->pdata->has_ccr) {
 496                 w = MCBSP_READ_CACHE(mcbsp, RCCR);
 497                 w |= (rx ? RDISABLE : 0);
 498                 MCBSP_WRITE(mcbsp, RCCR, w);
 499         }
 500         w = MCBSP_READ_CACHE(mcbsp, SPCR1);
 501         MCBSP_WRITE(mcbsp, SPCR1, w & ~rx);
 502 
 503         idle = !((MCBSP_READ_CACHE(mcbsp, SPCR2) |
 504                         MCBSP_READ_CACHE(mcbsp, SPCR1)) & 1);
 505 
 506         if (idle) {
 507                 /* Reset the sample rate generator */
 508                 w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 509                 MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
 510         }
 511 
 512         if (mcbsp->st_data)
 513                 omap_mcbsp_st_stop(mcbsp);
 514 }
 515 
 516 #define max_thres(m)                    (mcbsp->pdata->buffer_size)
 517 #define valid_threshold(m, val)         ((val) <= max_thres(m))
 518 #define THRESHOLD_PROP_BUILDER(prop)                                    \
 519 static ssize_t prop##_show(struct device *dev,                          \
 520                         struct device_attribute *attr, char *buf)       \
 521 {                                                                       \
 522         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);                \
 523                                                                         \
 524         return sprintf(buf, "%u\n", mcbsp->prop);                       \
 525 }                                                                       \
 526                                                                         \
 527 static ssize_t prop##_store(struct device *dev,                         \
 528                                 struct device_attribute *attr,          \
 529                                 const char *buf, size_t size)           \
 530 {                                                                       \
 531         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);                \
 532         unsigned long val;                                              \
 533         int status;                                                     \
 534                                                                         \
 535         status = kstrtoul(buf, 0, &val);                                \
 536         if (status)                                                     \
 537                 return status;                                          \
 538                                                                         \
 539         if (!valid_threshold(mcbsp, val))                               \
 540                 return -EDOM;                                           \
 541                                                                         \
 542         mcbsp->prop = val;                                              \
 543         return size;                                                    \
 544 }                                                                       \
 545                                                                         \
 546 static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store)
 547 
 548 THRESHOLD_PROP_BUILDER(max_tx_thres);
 549 THRESHOLD_PROP_BUILDER(max_rx_thres);
 550 
 551 static const char * const dma_op_modes[] = {
 552         "element", "threshold",
 553 };
 554 
 555 static ssize_t dma_op_mode_show(struct device *dev,
 556                                 struct device_attribute *attr, char *buf)
 557 {
 558         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 559         int dma_op_mode, i = 0;
 560         ssize_t len = 0;
 561         const char * const *s;
 562 
 563         dma_op_mode = mcbsp->dma_op_mode;
 564 
 565         for (s = &dma_op_modes[i]; i < ARRAY_SIZE(dma_op_modes); s++, i++) {
 566                 if (dma_op_mode == i)
 567                         len += sprintf(buf + len, "[%s] ", *s);
 568                 else
 569                         len += sprintf(buf + len, "%s ", *s);
 570         }
 571         len += sprintf(buf + len, "\n");
 572 
 573         return len;
 574 }
 575 
 576 static ssize_t dma_op_mode_store(struct device *dev,
 577                                  struct device_attribute *attr, const char *buf,
 578                                  size_t size)
 579 {
 580         struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
 581         int i;
 582 
 583         i = sysfs_match_string(dma_op_modes, buf);
 584         if (i < 0)
 585                 return i;
 586 
 587         spin_lock_irq(&mcbsp->lock);
 588         if (!mcbsp->free) {
 589                 size = -EBUSY;
 590                 goto unlock;
 591         }
 592         mcbsp->dma_op_mode = i;
 593 
 594 unlock:
 595         spin_unlock_irq(&mcbsp->lock);
 596 
 597         return size;
 598 }
 599 
 600 static DEVICE_ATTR_RW(dma_op_mode);
 601 
 602 static const struct attribute *additional_attrs[] = {
 603         &dev_attr_max_tx_thres.attr,
 604         &dev_attr_max_rx_thres.attr,
 605         &dev_attr_dma_op_mode.attr,
 606         NULL,
 607 };
 608 
 609 static const struct attribute_group additional_attr_group = {
 610         .attrs = (struct attribute **)additional_attrs,
 611 };
 612 
 613 /*
 614  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
 615  * 730 has only 2 McBSP, and both of them are MPU peripherals.
 616  */
 617 static int omap_mcbsp_init(struct platform_device *pdev)
 618 {
 619         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
 620         struct resource *res;
 621         int ret = 0;
 622 
 623         spin_lock_init(&mcbsp->lock);
 624         mcbsp->free = true;
 625 
 626         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 627         if (!res)
 628                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 629 
 630         mcbsp->io_base = devm_ioremap_resource(&pdev->dev, res);
 631         if (IS_ERR(mcbsp->io_base))
 632                 return PTR_ERR(mcbsp->io_base);
 633 
 634         mcbsp->phys_base = res->start;
 635         mcbsp->reg_cache_size = resource_size(res);
 636 
 637         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
 638         if (!res)
 639                 mcbsp->phys_dma_base = mcbsp->phys_base;
 640         else
 641                 mcbsp->phys_dma_base = res->start;
 642 
 643         /*
 644          * OMAP1, 2 uses two interrupt lines: TX, RX
 645          * OMAP2430, OMAP3 SoC have combined IRQ line as well.
 646          * OMAP4 and newer SoC only have the combined IRQ line.
 647          * Use the combined IRQ if available since it gives better debugging
 648          * possibilities.
 649          */
 650         mcbsp->irq = platform_get_irq_byname(pdev, "common");
 651         if (mcbsp->irq == -ENXIO) {
 652                 mcbsp->tx_irq = platform_get_irq_byname(pdev, "tx");
 653 
 654                 if (mcbsp->tx_irq == -ENXIO) {
 655                         mcbsp->irq = platform_get_irq(pdev, 0);
 656                         mcbsp->tx_irq = 0;
 657                 } else {
 658                         mcbsp->rx_irq = platform_get_irq_byname(pdev, "rx");
 659                         mcbsp->irq = 0;
 660                 }
 661         }
 662 
 663         if (!pdev->dev.of_node) {
 664                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "tx");
 665                 if (!res) {
 666                         dev_err(&pdev->dev, "invalid tx DMA channel\n");
 667                         return -ENODEV;
 668                 }
 669                 mcbsp->dma_req[0] = res->start;
 670                 mcbsp->dma_data[0].filter_data = &mcbsp->dma_req[0];
 671 
 672                 res = platform_get_resource_byname(pdev, IORESOURCE_DMA, "rx");
 673                 if (!res) {
 674                         dev_err(&pdev->dev, "invalid rx DMA channel\n");
 675                         return -ENODEV;
 676                 }
 677                 mcbsp->dma_req[1] = res->start;
 678                 mcbsp->dma_data[1].filter_data = &mcbsp->dma_req[1];
 679         } else {
 680                 mcbsp->dma_data[0].filter_data = "tx";
 681                 mcbsp->dma_data[1].filter_data = "rx";
 682         }
 683 
 684         mcbsp->dma_data[0].addr = omap_mcbsp_dma_reg_params(mcbsp,
 685                                                 SNDRV_PCM_STREAM_PLAYBACK);
 686         mcbsp->dma_data[1].addr = omap_mcbsp_dma_reg_params(mcbsp,
 687                                                 SNDRV_PCM_STREAM_CAPTURE);
 688 
 689         mcbsp->fclk = clk_get(&pdev->dev, "fck");
 690         if (IS_ERR(mcbsp->fclk)) {
 691                 ret = PTR_ERR(mcbsp->fclk);
 692                 dev_err(mcbsp->dev, "unable to get fck: %d\n", ret);
 693                 return ret;
 694         }
 695 
 696         mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
 697         if (mcbsp->pdata->buffer_size) {
 698                 /*
 699                  * Initially configure the maximum thresholds to a safe value.
 700                  * The McBSP FIFO usage with these values should not go under
 701                  * 16 locations.
 702                  * If the whole FIFO without safety buffer is used, than there
 703                  * is a possibility that the DMA will be not able to push the
 704                  * new data on time, causing channel shifts in runtime.
 705                  */
 706                 mcbsp->max_tx_thres = max_thres(mcbsp) - 0x10;
 707                 mcbsp->max_rx_thres = max_thres(mcbsp) - 0x10;
 708 
 709                 ret = sysfs_create_group(&mcbsp->dev->kobj,
 710                                          &additional_attr_group);
 711                 if (ret) {
 712                         dev_err(mcbsp->dev,
 713                                 "Unable to create additional controls\n");
 714                         goto err_thres;
 715                 }
 716         }
 717 
 718         ret = omap_mcbsp_st_init(pdev);
 719         if (ret)
 720                 goto err_st;
 721 
 722         return 0;
 723 
 724 err_st:
 725         if (mcbsp->pdata->buffer_size)
 726                 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
 727 err_thres:
 728         clk_put(mcbsp->fclk);
 729         return ret;
 730 }
 731 
 732 /*
 733  * Stream DMA parameters. DMA request line and port address are set runtime
 734  * since they are different between OMAP1 and later OMAPs
 735  */
 736 static void omap_mcbsp_set_threshold(struct snd_pcm_substream *substream,
 737                 unsigned int packet_size)
 738 {
 739         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 740         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 741         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 742         int words;
 743 
 744         /* No need to proceed further if McBSP does not have FIFO */
 745         if (mcbsp->pdata->buffer_size == 0)
 746                 return;
 747 
 748         /*
 749          * Configure McBSP threshold based on either:
 750          * packet_size, when the sDMA is in packet mode, or based on the
 751          * period size in THRESHOLD mode, otherwise use McBSP threshold = 1
 752          * for mono streams.
 753          */
 754         if (packet_size)
 755                 words = packet_size;
 756         else
 757                 words = 1;
 758 
 759         /* Configure McBSP internal buffer usage */
 760         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 761                 omap_mcbsp_set_tx_threshold(mcbsp, words);
 762         else
 763                 omap_mcbsp_set_rx_threshold(mcbsp, words);
 764 }
 765 
 766 static int omap_mcbsp_hwrule_min_buffersize(struct snd_pcm_hw_params *params,
 767                                     struct snd_pcm_hw_rule *rule)
 768 {
 769         struct snd_interval *buffer_size = hw_param_interval(params,
 770                                         SNDRV_PCM_HW_PARAM_BUFFER_SIZE);
 771         struct snd_interval *channels = hw_param_interval(params,
 772                                         SNDRV_PCM_HW_PARAM_CHANNELS);
 773         struct omap_mcbsp *mcbsp = rule->private;
 774         struct snd_interval frames;
 775         int size;
 776 
 777         snd_interval_any(&frames);
 778         size = mcbsp->pdata->buffer_size;
 779 
 780         frames.min = size / channels->min;
 781         frames.integer = 1;
 782         return snd_interval_refine(buffer_size, &frames);
 783 }
 784 
 785 static int omap_mcbsp_dai_startup(struct snd_pcm_substream *substream,
 786                                   struct snd_soc_dai *cpu_dai)
 787 {
 788         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 789         int err = 0;
 790 
 791         if (!cpu_dai->active)
 792                 err = omap_mcbsp_request(mcbsp);
 793 
 794         /*
 795          * OMAP3 McBSP FIFO is word structured.
 796          * McBSP2 has 1024 + 256 = 1280 word long buffer,
 797          * McBSP1,3,4,5 has 128 word long buffer
 798          * This means that the size of the FIFO depends on the sample format.
 799          * For example on McBSP3:
 800          * 16bit samples: size is 128 * 2 = 256 bytes
 801          * 32bit samples: size is 128 * 4 = 512 bytes
 802          * It is simpler to place constraint for buffer and period based on
 803          * channels.
 804          * McBSP3 as example again (16 or 32 bit samples):
 805          * 1 channel (mono): size is 128 frames (128 words)
 806          * 2 channels (stereo): size is 128 / 2 = 64 frames (2 * 64 words)
 807          * 4 channels: size is 128 / 4 = 32 frames (4 * 32 words)
 808          */
 809         if (mcbsp->pdata->buffer_size) {
 810                 /*
 811                 * Rule for the buffer size. We should not allow
 812                 * smaller buffer than the FIFO size to avoid underruns.
 813                 * This applies only for the playback stream.
 814                 */
 815                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 816                         snd_pcm_hw_rule_add(substream->runtime, 0,
 817                                             SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
 818                                             omap_mcbsp_hwrule_min_buffersize,
 819                                             mcbsp,
 820                                             SNDRV_PCM_HW_PARAM_CHANNELS, -1);
 821 
 822                 /* Make sure, that the period size is always even */
 823                 snd_pcm_hw_constraint_step(substream->runtime, 0,
 824                                            SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2);
 825         }
 826 
 827         return err;
 828 }
 829 
 830 static void omap_mcbsp_dai_shutdown(struct snd_pcm_substream *substream,
 831                                     struct snd_soc_dai *cpu_dai)
 832 {
 833         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 834         int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
 835         int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
 836         int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 837 
 838         if (mcbsp->latency[stream2])
 839                 pm_qos_update_request(&mcbsp->pm_qos_req,
 840                                       mcbsp->latency[stream2]);
 841         else if (mcbsp->latency[stream1])
 842                 pm_qos_remove_request(&mcbsp->pm_qos_req);
 843 
 844         mcbsp->latency[stream1] = 0;
 845 
 846         if (!cpu_dai->active) {
 847                 omap_mcbsp_free(mcbsp);
 848                 mcbsp->configured = 0;
 849         }
 850 }
 851 
 852 static int omap_mcbsp_dai_prepare(struct snd_pcm_substream *substream,
 853                                   struct snd_soc_dai *cpu_dai)
 854 {
 855         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 856         struct pm_qos_request *pm_qos_req = &mcbsp->pm_qos_req;
 857         int tx = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK);
 858         int stream1 = tx ? SNDRV_PCM_STREAM_PLAYBACK : SNDRV_PCM_STREAM_CAPTURE;
 859         int stream2 = tx ? SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
 860         int latency = mcbsp->latency[stream2];
 861 
 862         /* Prevent omap hardware from hitting off between FIFO fills */
 863         if (!latency || mcbsp->latency[stream1] < latency)
 864                 latency = mcbsp->latency[stream1];
 865 
 866         if (pm_qos_request_active(pm_qos_req))
 867                 pm_qos_update_request(pm_qos_req, latency);
 868         else if (latency)
 869                 pm_qos_add_request(pm_qos_req, PM_QOS_CPU_DMA_LATENCY, latency);
 870 
 871         return 0;
 872 }
 873 
 874 static int omap_mcbsp_dai_trigger(struct snd_pcm_substream *substream, int cmd,
 875                                   struct snd_soc_dai *cpu_dai)
 876 {
 877         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 878 
 879         switch (cmd) {
 880         case SNDRV_PCM_TRIGGER_START:
 881         case SNDRV_PCM_TRIGGER_RESUME:
 882         case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 883                 mcbsp->active++;
 884                 omap_mcbsp_start(mcbsp, substream->stream);
 885                 break;
 886 
 887         case SNDRV_PCM_TRIGGER_STOP:
 888         case SNDRV_PCM_TRIGGER_SUSPEND:
 889         case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 890                 omap_mcbsp_stop(mcbsp, substream->stream);
 891                 mcbsp->active--;
 892                 break;
 893         default:
 894                 return -EINVAL;
 895         }
 896 
 897         return 0;
 898 }
 899 
 900 static snd_pcm_sframes_t omap_mcbsp_dai_delay(
 901                         struct snd_pcm_substream *substream,
 902                         struct snd_soc_dai *dai)
 903 {
 904         struct snd_soc_pcm_runtime *rtd = substream->private_data;
 905         struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
 906         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 907         u16 fifo_use;
 908         snd_pcm_sframes_t delay;
 909 
 910         /* No need to proceed further if McBSP does not have FIFO */
 911         if (mcbsp->pdata->buffer_size == 0)
 912                 return 0;
 913 
 914         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 915                 fifo_use = omap_mcbsp_get_tx_delay(mcbsp);
 916         else
 917                 fifo_use = omap_mcbsp_get_rx_delay(mcbsp);
 918 
 919         /*
 920          * Divide the used locations with the channel count to get the
 921          * FIFO usage in samples (don't care about partial samples in the
 922          * buffer).
 923          */
 924         delay = fifo_use / substream->runtime->channels;
 925 
 926         return delay;
 927 }
 928 
 929 static int omap_mcbsp_dai_hw_params(struct snd_pcm_substream *substream,
 930                                     struct snd_pcm_hw_params *params,
 931                                     struct snd_soc_dai *cpu_dai)
 932 {
 933         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
 934         struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs;
 935         struct snd_dmaengine_dai_dma_data *dma_data;
 936         int wlen, channels, wpf;
 937         int pkt_size = 0;
 938         unsigned int format, div, framesize, master;
 939         unsigned int buffer_size = mcbsp->pdata->buffer_size;
 940 
 941         dma_data = snd_soc_dai_get_dma_data(cpu_dai, substream);
 942         channels = params_channels(params);
 943 
 944         switch (params_format(params)) {
 945         case SNDRV_PCM_FORMAT_S16_LE:
 946                 wlen = 16;
 947                 break;
 948         case SNDRV_PCM_FORMAT_S32_LE:
 949                 wlen = 32;
 950                 break;
 951         default:
 952                 return -EINVAL;
 953         }
 954         if (buffer_size) {
 955                 int latency;
 956 
 957                 if (mcbsp->dma_op_mode == MCBSP_DMA_MODE_THRESHOLD) {
 958                         int period_words, max_thrsh;
 959                         int divider = 0;
 960 
 961                         period_words = params_period_bytes(params) / (wlen / 8);
 962                         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 963                                 max_thrsh = mcbsp->max_tx_thres;
 964                         else
 965                                 max_thrsh = mcbsp->max_rx_thres;
 966                         /*
 967                          * Use sDMA packet mode if McBSP is in threshold mode:
 968                          * If period words less than the FIFO size the packet
 969                          * size is set to the number of period words, otherwise
 970                          * Look for the biggest threshold value which divides
 971                          * the period size evenly.
 972                          */
 973                         divider = period_words / max_thrsh;
 974                         if (period_words % max_thrsh)
 975                                 divider++;
 976                         while (period_words % divider &&
 977                                 divider < period_words)
 978                                 divider++;
 979                         if (divider == period_words)
 980                                 return -EINVAL;
 981 
 982                         pkt_size = period_words / divider;
 983                 } else if (channels > 1) {
 984                         /* Use packet mode for non mono streams */
 985                         pkt_size = channels;
 986                 }
 987 
 988                 latency = (buffer_size - pkt_size) / channels;
 989                 latency = latency * USEC_PER_SEC /
 990                           (params->rate_num / params->rate_den);
 991                 mcbsp->latency[substream->stream] = latency;
 992 
 993                 omap_mcbsp_set_threshold(substream, pkt_size);
 994         }
 995 
 996         dma_data->maxburst = pkt_size;
 997 
 998         if (mcbsp->configured) {
 999                 /* McBSP already configured by another stream */
1000                 return 0;
1001         }
1002 
1003         regs->rcr2      &= ~(RPHASE | RFRLEN2(0x7f) | RWDLEN2(7));
1004         regs->xcr2      &= ~(RPHASE | XFRLEN2(0x7f) | XWDLEN2(7));
1005         regs->rcr1      &= ~(RFRLEN1(0x7f) | RWDLEN1(7));
1006         regs->xcr1      &= ~(XFRLEN1(0x7f) | XWDLEN1(7));
1007         format = mcbsp->fmt & SND_SOC_DAIFMT_FORMAT_MASK;
1008         wpf = channels;
1009         if (channels == 2 && (format == SND_SOC_DAIFMT_I2S ||
1010                               format == SND_SOC_DAIFMT_LEFT_J)) {
1011                 /* Use dual-phase frames */
1012                 regs->rcr2      |= RPHASE;
1013                 regs->xcr2      |= XPHASE;
1014                 /* Set 1 word per (McBSP) frame for phase1 and phase2 */
1015                 wpf--;
1016                 regs->rcr2      |= RFRLEN2(wpf - 1);
1017                 regs->xcr2      |= XFRLEN2(wpf - 1);
1018         }
1019 
1020         regs->rcr1      |= RFRLEN1(wpf - 1);
1021         regs->xcr1      |= XFRLEN1(wpf - 1);
1022 
1023         switch (params_format(params)) {
1024         case SNDRV_PCM_FORMAT_S16_LE:
1025                 /* Set word lengths */
1026                 regs->rcr2      |= RWDLEN2(OMAP_MCBSP_WORD_16);
1027                 regs->rcr1      |= RWDLEN1(OMAP_MCBSP_WORD_16);
1028                 regs->xcr2      |= XWDLEN2(OMAP_MCBSP_WORD_16);
1029                 regs->xcr1      |= XWDLEN1(OMAP_MCBSP_WORD_16);
1030                 break;
1031         case SNDRV_PCM_FORMAT_S32_LE:
1032                 /* Set word lengths */
1033                 regs->rcr2      |= RWDLEN2(OMAP_MCBSP_WORD_32);
1034                 regs->rcr1      |= RWDLEN1(OMAP_MCBSP_WORD_32);
1035                 regs->xcr2      |= XWDLEN2(OMAP_MCBSP_WORD_32);
1036                 regs->xcr1      |= XWDLEN1(OMAP_MCBSP_WORD_32);
1037                 break;
1038         default:
1039                 /* Unsupported PCM format */
1040                 return -EINVAL;
1041         }
1042 
1043         /* In McBSP master modes, FRAME (i.e. sample rate) is generated
1044          * by _counting_ BCLKs. Calculate frame size in BCLKs */
1045         master = mcbsp->fmt & SND_SOC_DAIFMT_MASTER_MASK;
1046         if (master ==   SND_SOC_DAIFMT_CBS_CFS) {
1047                 div = mcbsp->clk_div ? mcbsp->clk_div : 1;
1048                 framesize = (mcbsp->in_freq / div) / params_rate(params);
1049 
1050                 if (framesize < wlen * channels) {
1051                         printk(KERN_ERR "%s: not enough bandwidth for desired rate and "
1052                                         "channels\n", __func__);
1053                         return -EINVAL;
1054                 }
1055         } else
1056                 framesize = wlen * channels;
1057 
1058         /* Set FS period and length in terms of bit clock periods */
1059         regs->srgr2     &= ~FPER(0xfff);
1060         regs->srgr1     &= ~FWID(0xff);
1061         switch (format) {
1062         case SND_SOC_DAIFMT_I2S:
1063         case SND_SOC_DAIFMT_LEFT_J:
1064                 regs->srgr2     |= FPER(framesize - 1);
1065                 regs->srgr1     |= FWID((framesize >> 1) - 1);
1066                 break;
1067         case SND_SOC_DAIFMT_DSP_A:
1068         case SND_SOC_DAIFMT_DSP_B:
1069                 regs->srgr2     |= FPER(framesize - 1);
1070                 regs->srgr1     |= FWID(0);
1071                 break;
1072         }
1073 
1074         omap_mcbsp_config(mcbsp, &mcbsp->cfg_regs);
1075         mcbsp->wlen = wlen;
1076         mcbsp->configured = 1;
1077 
1078         return 0;
1079 }
1080 
1081 /*
1082  * This must be called before _set_clkdiv and _set_sysclk since McBSP register
1083  * cache is initialized here
1084  */
1085 static int omap_mcbsp_dai_set_dai_fmt(struct snd_soc_dai *cpu_dai,
1086                                       unsigned int fmt)
1087 {
1088         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
1089         struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs;
1090         bool inv_fs = false;
1091 
1092         if (mcbsp->configured)
1093                 return 0;
1094 
1095         mcbsp->fmt = fmt;
1096         memset(regs, 0, sizeof(*regs));
1097         /* Generic McBSP register settings */
1098         regs->spcr2     |= XINTM(3) | FREE;
1099         regs->spcr1     |= RINTM(3);
1100         /* RFIG and XFIG are not defined in 2430 and on OMAP3+ */
1101         if (!mcbsp->pdata->has_ccr) {
1102                 regs->rcr2      |= RFIG;
1103                 regs->xcr2      |= XFIG;
1104         }
1105 
1106         /* Configure XCCR/RCCR only for revisions which have ccr registers */
1107         if (mcbsp->pdata->has_ccr) {
1108                 regs->xccr = DXENDLY(1) | XDMAEN | XDISABLE;
1109                 regs->rccr = RFULL_CYCLE | RDMAEN | RDISABLE;
1110         }
1111 
1112         switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
1113         case SND_SOC_DAIFMT_I2S:
1114                 /* 1-bit data delay */
1115                 regs->rcr2      |= RDATDLY(1);
1116                 regs->xcr2      |= XDATDLY(1);
1117                 break;
1118         case SND_SOC_DAIFMT_LEFT_J:
1119                 /* 0-bit data delay */
1120                 regs->rcr2      |= RDATDLY(0);
1121                 regs->xcr2      |= XDATDLY(0);
1122                 regs->spcr1     |= RJUST(2);
1123                 /* Invert FS polarity configuration */
1124                 inv_fs = true;
1125                 break;
1126         case SND_SOC_DAIFMT_DSP_A:
1127                 /* 1-bit data delay */
1128                 regs->rcr2      |= RDATDLY(1);
1129                 regs->xcr2      |= XDATDLY(1);
1130                 /* Invert FS polarity configuration */
1131                 inv_fs = true;
1132                 break;
1133         case SND_SOC_DAIFMT_DSP_B:
1134                 /* 0-bit data delay */
1135                 regs->rcr2      |= RDATDLY(0);
1136                 regs->xcr2      |= XDATDLY(0);
1137                 /* Invert FS polarity configuration */
1138                 inv_fs = true;
1139                 break;
1140         default:
1141                 /* Unsupported data format */
1142                 return -EINVAL;
1143         }
1144 
1145         switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
1146         case SND_SOC_DAIFMT_CBS_CFS:
1147                 /* McBSP master. Set FS and bit clocks as outputs */
1148                 regs->pcr0      |= FSXM | FSRM |
1149                                    CLKXM | CLKRM;
1150                 /* Sample rate generator drives the FS */
1151                 regs->srgr2     |= FSGM;
1152                 break;
1153         case SND_SOC_DAIFMT_CBM_CFS:
1154                 /* McBSP slave. FS clock as output */
1155                 regs->srgr2     |= FSGM;
1156                 regs->pcr0      |= FSXM | FSRM;
1157                 break;
1158         case SND_SOC_DAIFMT_CBM_CFM:
1159                 /* McBSP slave */
1160                 break;
1161         default:
1162                 /* Unsupported master/slave configuration */
1163                 return -EINVAL;
1164         }
1165 
1166         /* Set bit clock (CLKX/CLKR) and FS polarities */
1167         switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
1168         case SND_SOC_DAIFMT_NB_NF:
1169                 /*
1170                  * Normal BCLK + FS.
1171                  * FS active low. TX data driven on falling edge of bit clock
1172                  * and RX data sampled on rising edge of bit clock.
1173                  */
1174                 regs->pcr0      |= FSXP | FSRP |
1175                                    CLKXP | CLKRP;
1176                 break;
1177         case SND_SOC_DAIFMT_NB_IF:
1178                 regs->pcr0      |= CLKXP | CLKRP;
1179                 break;
1180         case SND_SOC_DAIFMT_IB_NF:
1181                 regs->pcr0      |= FSXP | FSRP;
1182                 break;
1183         case SND_SOC_DAIFMT_IB_IF:
1184                 break;
1185         default:
1186                 return -EINVAL;
1187         }
1188         if (inv_fs == true)
1189                 regs->pcr0 ^= FSXP | FSRP;
1190 
1191         return 0;
1192 }
1193 
1194 static int omap_mcbsp_dai_set_clkdiv(struct snd_soc_dai *cpu_dai,
1195                                      int div_id, int div)
1196 {
1197         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
1198         struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs;
1199 
1200         if (div_id != OMAP_MCBSP_CLKGDV)
1201                 return -ENODEV;
1202 
1203         mcbsp->clk_div = div;
1204         regs->srgr1     &= ~CLKGDV(0xff);
1205         regs->srgr1     |= CLKGDV(div - 1);
1206 
1207         return 0;
1208 }
1209 
1210 static int omap_mcbsp_dai_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
1211                                          int clk_id, unsigned int freq,
1212                                          int dir)
1213 {
1214         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(cpu_dai);
1215         struct omap_mcbsp_reg_cfg *regs = &mcbsp->cfg_regs;
1216         int err = 0;
1217 
1218         if (mcbsp->active) {
1219                 if (freq == mcbsp->in_freq)
1220                         return 0;
1221                 else
1222                         return -EBUSY;
1223         }
1224 
1225         mcbsp->in_freq = freq;
1226         regs->srgr2 &= ~CLKSM;
1227         regs->pcr0 &= ~SCLKME;
1228 
1229         switch (clk_id) {
1230         case OMAP_MCBSP_SYSCLK_CLK:
1231                 regs->srgr2     |= CLKSM;
1232                 break;
1233         case OMAP_MCBSP_SYSCLK_CLKS_FCLK:
1234                 if (mcbsp_omap1()) {
1235                         err = -EINVAL;
1236                         break;
1237                 }
1238                 err = omap2_mcbsp_set_clks_src(mcbsp,
1239                                                MCBSP_CLKS_PRCM_SRC);
1240                 break;
1241         case OMAP_MCBSP_SYSCLK_CLKS_EXT:
1242                 if (mcbsp_omap1()) {
1243                         err = 0;
1244                         break;
1245                 }
1246                 err = omap2_mcbsp_set_clks_src(mcbsp,
1247                                                MCBSP_CLKS_PAD_SRC);
1248                 break;
1249 
1250         case OMAP_MCBSP_SYSCLK_CLKX_EXT:
1251                 regs->srgr2     |= CLKSM;
1252                 regs->pcr0      |= SCLKME;
1253                 /*
1254                  * If McBSP is master but yet the CLKX/CLKR pin drives the SRG,
1255                  * disable output on those pins. This enables to inject the
1256                  * reference clock through CLKX/CLKR. For this to work
1257                  * set_dai_sysclk() _needs_ to be called after set_dai_fmt().
1258                  */
1259                 regs->pcr0      &= ~CLKXM;
1260                 break;
1261         case OMAP_MCBSP_SYSCLK_CLKR_EXT:
1262                 regs->pcr0      |= SCLKME;
1263                 /* Disable ouput on CLKR pin in master mode */
1264                 regs->pcr0      &= ~CLKRM;
1265                 break;
1266         default:
1267                 err = -ENODEV;
1268         }
1269 
1270         return err;
1271 }
1272 
1273 static const struct snd_soc_dai_ops mcbsp_dai_ops = {
1274         .startup        = omap_mcbsp_dai_startup,
1275         .shutdown       = omap_mcbsp_dai_shutdown,
1276         .prepare        = omap_mcbsp_dai_prepare,
1277         .trigger        = omap_mcbsp_dai_trigger,
1278         .delay          = omap_mcbsp_dai_delay,
1279         .hw_params      = omap_mcbsp_dai_hw_params,
1280         .set_fmt        = omap_mcbsp_dai_set_dai_fmt,
1281         .set_clkdiv     = omap_mcbsp_dai_set_clkdiv,
1282         .set_sysclk     = omap_mcbsp_dai_set_dai_sysclk,
1283 };
1284 
1285 static int omap_mcbsp_probe(struct snd_soc_dai *dai)
1286 {
1287         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(dai);
1288 
1289         pm_runtime_enable(mcbsp->dev);
1290 
1291         snd_soc_dai_init_dma_data(dai,
1292                                   &mcbsp->dma_data[SNDRV_PCM_STREAM_PLAYBACK],
1293                                   &mcbsp->dma_data[SNDRV_PCM_STREAM_CAPTURE]);
1294 
1295         return 0;
1296 }
1297 
1298 static int omap_mcbsp_remove(struct snd_soc_dai *dai)
1299 {
1300         struct omap_mcbsp *mcbsp = snd_soc_dai_get_drvdata(dai);
1301 
1302         pm_runtime_disable(mcbsp->dev);
1303 
1304         return 0;
1305 }
1306 
1307 static struct snd_soc_dai_driver omap_mcbsp_dai = {
1308         .probe = omap_mcbsp_probe,
1309         .remove = omap_mcbsp_remove,
1310         .playback = {
1311                 .channels_min = 1,
1312                 .channels_max = 16,
1313                 .rates = OMAP_MCBSP_RATES,
1314                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
1315         },
1316         .capture = {
1317                 .channels_min = 1,
1318                 .channels_max = 16,
1319                 .rates = OMAP_MCBSP_RATES,
1320                 .formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S32_LE,
1321         },
1322         .ops = &mcbsp_dai_ops,
1323 };
1324 
1325 static const struct snd_soc_component_driver omap_mcbsp_component = {
1326         .name           = "omap-mcbsp",
1327 };
1328 
1329 static struct omap_mcbsp_platform_data omap2420_pdata = {
1330         .reg_step = 4,
1331         .reg_size = 2,
1332 };
1333 
1334 static struct omap_mcbsp_platform_data omap2430_pdata = {
1335         .reg_step = 4,
1336         .reg_size = 4,
1337         .has_ccr = true,
1338 };
1339 
1340 static struct omap_mcbsp_platform_data omap3_pdata = {
1341         .reg_step = 4,
1342         .reg_size = 4,
1343         .has_ccr = true,
1344         .has_wakeup = true,
1345 };
1346 
1347 static struct omap_mcbsp_platform_data omap4_pdata = {
1348         .reg_step = 4,
1349         .reg_size = 4,
1350         .has_ccr = true,
1351         .has_wakeup = true,
1352 };
1353 
1354 static const struct of_device_id omap_mcbsp_of_match[] = {
1355         {
1356                 .compatible = "ti,omap2420-mcbsp",
1357                 .data = &omap2420_pdata,
1358         },
1359         {
1360                 .compatible = "ti,omap2430-mcbsp",
1361                 .data = &omap2430_pdata,
1362         },
1363         {
1364                 .compatible = "ti,omap3-mcbsp",
1365                 .data = &omap3_pdata,
1366         },
1367         {
1368                 .compatible = "ti,omap4-mcbsp",
1369                 .data = &omap4_pdata,
1370         },
1371         { },
1372 };
1373 MODULE_DEVICE_TABLE(of, omap_mcbsp_of_match);
1374 
1375 static int asoc_mcbsp_probe(struct platform_device *pdev)
1376 {
1377         struct omap_mcbsp_platform_data *pdata = dev_get_platdata(&pdev->dev);
1378         struct omap_mcbsp *mcbsp;
1379         const struct of_device_id *match;
1380         int ret;
1381 
1382         match = of_match_device(omap_mcbsp_of_match, &pdev->dev);
1383         if (match) {
1384                 struct device_node *node = pdev->dev.of_node;
1385                 struct omap_mcbsp_platform_data *pdata_quirk = pdata;
1386                 int buffer_size;
1387 
1388                 pdata = devm_kzalloc(&pdev->dev,
1389                                      sizeof(struct omap_mcbsp_platform_data),
1390                                      GFP_KERNEL);
1391                 if (!pdata)
1392                         return -ENOMEM;
1393 
1394                 memcpy(pdata, match->data, sizeof(*pdata));
1395                 if (!of_property_read_u32(node, "ti,buffer-size", &buffer_size))
1396                         pdata->buffer_size = buffer_size;
1397                 if (pdata_quirk)
1398                         pdata->force_ick_on = pdata_quirk->force_ick_on;
1399         } else if (!pdata) {
1400                 dev_err(&pdev->dev, "missing platform data.\n");
1401                 return -EINVAL;
1402         }
1403         mcbsp = devm_kzalloc(&pdev->dev, sizeof(struct omap_mcbsp), GFP_KERNEL);
1404         if (!mcbsp)
1405                 return -ENOMEM;
1406 
1407         mcbsp->id = pdev->id;
1408         mcbsp->pdata = pdata;
1409         mcbsp->dev = &pdev->dev;
1410         platform_set_drvdata(pdev, mcbsp);
1411 
1412         ret = omap_mcbsp_init(pdev);
1413         if (ret)
1414                 return ret;
1415 
1416         if (mcbsp->pdata->reg_size == 2) {
1417                 omap_mcbsp_dai.playback.formats = SNDRV_PCM_FMTBIT_S16_LE;
1418                 omap_mcbsp_dai.capture.formats = SNDRV_PCM_FMTBIT_S16_LE;
1419         }
1420 
1421         ret = devm_snd_soc_register_component(&pdev->dev,
1422                                               &omap_mcbsp_component,
1423                                               &omap_mcbsp_dai, 1);
1424         if (ret)
1425                 return ret;
1426 
1427         return sdma_pcm_platform_register(&pdev->dev, "tx", "rx");
1428 }
1429 
1430 static int asoc_mcbsp_remove(struct platform_device *pdev)
1431 {
1432         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
1433 
1434         if (mcbsp->pdata->ops && mcbsp->pdata->ops->free)
1435                 mcbsp->pdata->ops->free(mcbsp->id);
1436 
1437         if (pm_qos_request_active(&mcbsp->pm_qos_req))
1438                 pm_qos_remove_request(&mcbsp->pm_qos_req);
1439 
1440         if (mcbsp->pdata->buffer_size)
1441                 sysfs_remove_group(&mcbsp->dev->kobj, &additional_attr_group);
1442 
1443         omap_mcbsp_st_cleanup(pdev);
1444 
1445         clk_put(mcbsp->fclk);
1446 
1447         return 0;
1448 }
1449 
1450 static struct platform_driver asoc_mcbsp_driver = {
1451         .driver = {
1452                         .name = "omap-mcbsp",
1453                         .of_match_table = omap_mcbsp_of_match,
1454         },
1455 
1456         .probe = asoc_mcbsp_probe,
1457         .remove = asoc_mcbsp_remove,
1458 };
1459 
1460 module_platform_driver(asoc_mcbsp_driver);
1461 
1462 MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@bitmer.com>");
1463 MODULE_DESCRIPTION("OMAP I2S SoC Interface");
1464 MODULE_LICENSE("GPL");
1465 MODULE_ALIAS("platform:omap-mcbsp");
/* [<][>][^][v][top][bottom][index][help] */
root/sound/soc/ti/omap-mcbsp.c

DEFINITIONS
