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   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/wait.h>
  20 #include <linux/completion.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/err.h>
  23 #include <linux/clk.h>
  24 #include <linux/delay.h>
  25 #include <linux/io.h>
  26
  27 #include <asm/arch/dma.h>
  28 #include <asm/arch/mcbsp.h>
  29
  30 static struct omap_mcbsp mcbsp[OMAP_MAX_MCBSP_COUNT];
  31
  32 #define omap_mcbsp_check_valid_id(id)   (mcbsp[id].pdata && \
  33                                         mcbsp[id].pdata->ops && \
  34                                         mcbsp[id].pdata->ops->check && \
  35                                         (mcbsp[id].pdata->ops->check(id) == 0))
  36
  37 static void omap_mcbsp_dump_reg(u8 id)
  38 {
  39         dev_dbg(mcbsp[id].dev, "**** McBSP%d regs ****\n", mcbsp[id].id);
  40         dev_dbg(mcbsp[id].dev, "DRR2:  0x%04x\n",
  41                         OMAP_MCBSP_READ(mcbsp[id].io_base, DRR2));
  42         dev_dbg(mcbsp[id].dev, "DRR1:  0x%04x\n",
  43                         OMAP_MCBSP_READ(mcbsp[id].io_base, DRR1));
  44         dev_dbg(mcbsp[id].dev, "DXR2:  0x%04x\n",
  45                         OMAP_MCBSP_READ(mcbsp[id].io_base, DXR2));
  46         dev_dbg(mcbsp[id].dev, "DXR1:  0x%04x\n",
  47                         OMAP_MCBSP_READ(mcbsp[id].io_base, DXR1));
  48         dev_dbg(mcbsp[id].dev, "SPCR2: 0x%04x\n",
  49                         OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR2));
  50         dev_dbg(mcbsp[id].dev, "SPCR1: 0x%04x\n",
  51                         OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR1));
  52         dev_dbg(mcbsp[id].dev, "RCR2:  0x%04x\n",
  53                         OMAP_MCBSP_READ(mcbsp[id].io_base, RCR2));
  54         dev_dbg(mcbsp[id].dev, "RCR1:  0x%04x\n",
  55                         OMAP_MCBSP_READ(mcbsp[id].io_base, RCR1));
  56         dev_dbg(mcbsp[id].dev, "XCR2:  0x%04x\n",
  57                         OMAP_MCBSP_READ(mcbsp[id].io_base, XCR2));
  58         dev_dbg(mcbsp[id].dev, "XCR1:  0x%04x\n",
  59                         OMAP_MCBSP_READ(mcbsp[id].io_base, XCR1));
  60         dev_dbg(mcbsp[id].dev, "SRGR2: 0x%04x\n",
  61                         OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR2));
  62         dev_dbg(mcbsp[id].dev, "SRGR1: 0x%04x\n",
  63                         OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR1));
  64         dev_dbg(mcbsp[id].dev, "PCR0:  0x%04x\n",
  65                         OMAP_MCBSP_READ(mcbsp[id].io_base, PCR0));
  66         dev_dbg(mcbsp[id].dev, "***********************\n");
  67 }
  68
  69 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
  70 {
  71         struct omap_mcbsp *mcbsp_tx = dev_id;
  72
  73         dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n",
  74                 OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2));
  75
  76         complete(&mcbsp_tx->tx_irq_completion);
  77
  78         return IRQ_HANDLED;
  79 }
  80
  81 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
  82 {
  83         struct omap_mcbsp *mcbsp_rx = dev_id;
  84
  85         dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n",
  86                 OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2));
  87
  88         complete(&mcbsp_rx->rx_irq_completion);
  89
  90         return IRQ_HANDLED;
  91 }
  92
  93 static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
  94 {
  95         struct omap_mcbsp *mcbsp_dma_tx = data;
  96
  97         dev_dbg(mcbsp_dma_tx->dev, "TX DMA callback : 0x%x\n",
  98                 OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
  99
 100         /* We can free the channels */
 101         omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
 102         mcbsp_dma_tx->dma_tx_lch = -1;
 103
 104         complete(&mcbsp_dma_tx->tx_dma_completion);
 105 }
 106
 107 static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
 108 {
 109         struct omap_mcbsp *mcbsp_dma_rx = data;
 110
 111         dev_dbg(mcbsp_dma_rx->dev, "RX DMA callback : 0x%x\n",
 112                 OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
 113
 114         /* We can free the channels */
 115         omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
 116         mcbsp_dma_rx->dma_rx_lch = -1;
 117
 118         complete(&mcbsp_dma_rx->rx_dma_completion);
 119 }
 120
 121 /*
 122  * omap_mcbsp_config simply write a config to the
 123  * appropriate McBSP.
 124  * You either call this function or set the McBSP registers
 125  * by yourself before calling omap_mcbsp_start().
 126  */
 127 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 128 {
 129         u32 io_base;
 130
 131         if (!omap_mcbsp_check_valid_id(id)) {
 132                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 133                 return;
 134         }
 135
 136         io_base = mcbsp[id].io_base;
 137         dev_dbg(mcbsp[id].dev, "Configuring McBSP%d  io_base: 0x%8x\n",
 138                         mcbsp[id].id, io_base);
 139
 140         /* We write the given config */
 141         OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
 142         OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
 143         OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
 144         OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
 145         OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
 146         OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
 147         OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
 148         OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
 149         OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
 150         OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
 151         OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
 152 }
 153 EXPORT_SYMBOL(omap_mcbsp_config);
 154
 155 /*
 156  * We can choose between IRQ based or polled IO.
 157  * This needs to be called before omap_mcbsp_request().
 158  */
 159 int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
 160 {
 161         if (!omap_mcbsp_check_valid_id(id)) {
 162                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 163                 return -ENODEV;
 164         }
 165
 166         spin_lock(&mcbsp[id].lock);
 167
 168         if (!mcbsp[id].free) {
 169                 dev_err(mcbsp[id].dev, "McBSP%d is currently in use\n",
 170                         mcbsp[id].id);
 171                 spin_unlock(&mcbsp[id].lock);
 172                 return -EINVAL;
 173         }
 174
 175         mcbsp[id].io_type = io_type;
 176
 177         spin_unlock(&mcbsp[id].lock);
 178
 179         return 0;
 180 }
 181 EXPORT_SYMBOL(omap_mcbsp_set_io_type);
 182
 183 int omap_mcbsp_request(unsigned int id)
 184 {
 185         int err;
 186
 187         if (!omap_mcbsp_check_valid_id(id)) {
 188                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 189                 return -ENODEV;
 190         }
 191
 192         if (mcbsp[id].pdata->ops->request)
 193                 mcbsp[id].pdata->ops->request(id);
 194
 195         clk_enable(mcbsp[id].clk);
 196
 197         spin_lock(&mcbsp[id].lock);
 198         if (!mcbsp[id].free) {
 199                 dev_err(mcbsp[id].dev, "McBSP%d is currently in use\n",
 200                         mcbsp[id].id);
 201                 spin_unlock(&mcbsp[id].lock);
 202                 return -1;
 203         }
 204
 205         mcbsp[id].free = 0;
 206         spin_unlock(&mcbsp[id].lock);
 207
 208         if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
 209                 /* We need to get IRQs here */
 210                 err = request_irq(mcbsp[id].tx_irq, omap_mcbsp_tx_irq_handler,
 211                                         0, "McBSP", (void *) (&mcbsp[id]));
 212                 if (err != 0) {
 213                         dev_err(mcbsp[id].dev, "Unable to request TX IRQ %d "
 214                                         "for McBSP%d\n", mcbsp[id].tx_irq,
 215                                         mcbsp[id].id);
 216                         return err;
 217                 }
 218
 219                 init_completion(&(mcbsp[id].tx_irq_completion));
 220
 221                 err = request_irq(mcbsp[id].rx_irq, omap_mcbsp_rx_irq_handler,
 222                                         0, "McBSP", (void *) (&mcbsp[id]));
 223                 if (err != 0) {
 224                         dev_err(mcbsp[id].dev, "Unable to request RX IRQ %d "
 225                                         "for McBSP%d\n", mcbsp[id].rx_irq,
 226                                         mcbsp[id].id);
 227                         free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
 228                         return err;
 229                 }
 230
 231                 init_completion(&(mcbsp[id].rx_irq_completion));
 232         }
 233
 234         return 0;
 235 }
 236 EXPORT_SYMBOL(omap_mcbsp_request);
 237
 238 void omap_mcbsp_free(unsigned int id)
 239 {
 240         if (!omap_mcbsp_check_valid_id(id)) {
 241                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 242                 return;
 243         }
 244
 245         if (mcbsp[id].pdata->ops->free)
 246                 mcbsp[id].pdata->ops->free(id);
 247
 248         clk_disable(mcbsp[id].clk);
 249
 250         spin_lock(&mcbsp[id].lock);
 251         if (mcbsp[id].free) {
 252                 dev_err(mcbsp[id].dev, "McBSP%d was not reserved\n",
 253                         mcbsp[id].id);
 254                 spin_unlock(&mcbsp[id].lock);
 255                 return;
 256         }
 257
 258         mcbsp[id].free = 1;
 259         spin_unlock(&mcbsp[id].lock);
 260
 261         if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
 262                 /* Free IRQs */
 263                 free_irq(mcbsp[id].rx_irq, (void *) (&mcbsp[id]));
 264                 free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
 265         }
 266 }
 267 EXPORT_SYMBOL(omap_mcbsp_free);
 268
 269 /*
 270  * Here we start the McBSP, by enabling the sample
 271  * generator, both transmitter and receivers,
 272  * and the frame sync.
 273  */
 274 void omap_mcbsp_start(unsigned int id)
 275 {
 276         u32 io_base;
 277         u16 w;
 278
 279         if (!omap_mcbsp_check_valid_id(id)) {
 280                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 281                 return;
 282         }
 283
 284         io_base = mcbsp[id].io_base;
 285
 286         mcbsp[id].rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7;
 287         mcbsp[id].tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7;
 288
 289         /* Start the sample generator */
 290         w = OMAP_MCBSP_READ(io_base, SPCR2);
 291         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
 292
 293         /* Enable transmitter and receiver */
 294         w = OMAP_MCBSP_READ(io_base, SPCR2);
 295         OMAP_MCBSP_WRITE(io_base, SPCR2, w | 1);
 296
 297         w = OMAP_MCBSP_READ(io_base, SPCR1);
 298         OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1);
 299
 300         udelay(100);
 301
 302         /* Start frame sync */
 303         w = OMAP_MCBSP_READ(io_base, SPCR2);
 304         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
 305
 306         /* Dump McBSP Regs */
 307         omap_mcbsp_dump_reg(id);
 308 }
 309 EXPORT_SYMBOL(omap_mcbsp_start);
 310
 311 void omap_mcbsp_stop(unsigned int id)
 312 {
 313         u32 io_base;
 314         u16 w;
 315
 316         if (!omap_mcbsp_check_valid_id(id)) {
 317                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 318                 return;
 319         }
 320
 321         io_base = mcbsp[id].io_base;
 322
 323         /* Reset transmitter */
 324         w = OMAP_MCBSP_READ(io_base, SPCR2);
 325         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1));
 326
 327         /* Reset receiver */
 328         w = OMAP_MCBSP_READ(io_base, SPCR1);
 329         OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(1));
 330
 331         /* Reset the sample rate generator */
 332         w = OMAP_MCBSP_READ(io_base, SPCR2);
 333         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
 334 }
 335 EXPORT_SYMBOL(omap_mcbsp_stop);
 336
 337 /* polled mcbsp i/o operations */
 338 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 339 {
 340         u32 base;
 341
 342         if (!omap_mcbsp_check_valid_id(id)) {
 343                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 344                 return -ENODEV;
 345         }
 346
 347         base = mcbsp[id].io_base;
 348         writew(buf, base + OMAP_MCBSP_REG_DXR1);
 349         /* if frame sync error - clear the error */
 350         if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
 351                 /* clear error */
 352                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
 353                        base + OMAP_MCBSP_REG_SPCR2);
 354                 /* resend */
 355                 return -1;
 356         } else {
 357                 /* wait for transmit confirmation */
 358                 int attemps = 0;
 359                 while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
 360                         if (attemps++ > 1000) {
 361                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
 362                                        (~XRST),
 363                                        base + OMAP_MCBSP_REG_SPCR2);
 364                                 udelay(10);
 365                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
 366                                        (XRST),
 367                                        base + OMAP_MCBSP_REG_SPCR2);
 368                                 udelay(10);
 369                                 dev_err(mcbsp[id].dev, "Could not write to"
 370                                         " McBSP%d Register\n", mcbsp[id].id);
 371                                 return -2;
 372                         }
 373                 }
 374         }
 375
 376         return 0;
 377 }
 378 EXPORT_SYMBOL(omap_mcbsp_pollwrite);
 379
 380 int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 381 {
 382         u32 base;
 383
 384         if (!omap_mcbsp_check_valid_id(id)) {
 385                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 386                 return -ENODEV;
 387         }
 388
 389         base = mcbsp[id].io_base;
 390         /* if frame sync error - clear the error */
 391         if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
 392                 /* clear error */
 393                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR),
 394                        base + OMAP_MCBSP_REG_SPCR1);
 395                 /* resend */
 396                 return -1;
 397         } else {
 398                 /* wait for recieve confirmation */
 399                 int attemps = 0;
 400                 while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) {
 401                         if (attemps++ > 1000) {
 402                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) &
 403                                        (~RRST),
 404                                        base + OMAP_MCBSP_REG_SPCR1);
 405                                 udelay(10);
 406                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) |
 407                                        (RRST),
 408                                        base + OMAP_MCBSP_REG_SPCR1);
 409                                 udelay(10);
 410                                 dev_err(mcbsp[id].dev, "Could not read from"
 411                                         " McBSP%d Register\n", mcbsp[id].id);
 412                                 return -2;
 413                         }
 414                 }
 415         }
 416         *buf = readw(base + OMAP_MCBSP_REG_DRR1);
 417
 418         return 0;
 419 }
 420 EXPORT_SYMBOL(omap_mcbsp_pollread);
 421
 422 /*
 423  * IRQ based word transmission.
 424  */
 425 void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 426 {
 427         u32 io_base;
 428         omap_mcbsp_word_length word_length;
 429
 430         if (!omap_mcbsp_check_valid_id(id)) {
 431                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 432                 return;
 433         }
 434
 435         io_base = mcbsp[id].io_base;
 436         word_length = mcbsp[id].tx_word_length;
 437
 438         wait_for_completion(&(mcbsp[id].tx_irq_completion));
 439
 440         if (word_length > OMAP_MCBSP_WORD_16)
 441                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 442         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 443 }
 444 EXPORT_SYMBOL(omap_mcbsp_xmit_word);
 445
 446 u32 omap_mcbsp_recv_word(unsigned int id)
 447 {
 448         u32 io_base;
 449         u16 word_lsb, word_msb = 0;
 450         omap_mcbsp_word_length word_length;
 451
 452         if (!omap_mcbsp_check_valid_id(id)) {
 453                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 454                 return -ENODEV;
 455         }
 456
 457         word_length = mcbsp[id].rx_word_length;
 458         io_base = mcbsp[id].io_base;
 459
 460         wait_for_completion(&(mcbsp[id].rx_irq_completion));
 461
 462         if (word_length > OMAP_MCBSP_WORD_16)
 463                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 464         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 465
 466         return (word_lsb | (word_msb << 16));
 467 }
 468 EXPORT_SYMBOL(omap_mcbsp_recv_word);
 469
 470 int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 471 {
 472         u32 io_base;
 473         omap_mcbsp_word_length tx_word_length;
 474         omap_mcbsp_word_length rx_word_length;
 475         u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
 476
 477         if (!omap_mcbsp_check_valid_id(id)) {
 478                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 479                 return -ENODEV;
 480         }
 481
 482         io_base = mcbsp[id].io_base;
 483         tx_word_length = mcbsp[id].tx_word_length;
 484         rx_word_length = mcbsp[id].rx_word_length;
 485
 486         if (tx_word_length != rx_word_length)
 487                 return -EINVAL;
 488
 489         /* First we wait for the transmitter to be ready */
 490         spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 491         while (!(spcr2 & XRDY)) {
 492                 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 493                 if (attempts++ > 1000) {
 494                         /* We must reset the transmitter */
 495                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
 496                         udelay(10);
 497                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 498                         udelay(10);
 499                         dev_err(mcbsp[id].dev, "McBSP%d transmitter not "
 500                                 "ready\n", mcbsp[id].id);
 501                         return -EAGAIN;
 502                 }
 503         }
 504
 505         /* Now we can push the data */
 506         if (tx_word_length > OMAP_MCBSP_WORD_16)
 507                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 508         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 509
 510         /* We wait for the receiver to be ready */
 511         spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 512         while (!(spcr1 & RRDY)) {
 513                 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 514                 if (attempts++ > 1000) {
 515                         /* We must reset the receiver */
 516                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
 517                         udelay(10);
 518                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 519                         udelay(10);
 520                         dev_err(mcbsp[id].dev, "McBSP%d receiver not "
 521                                 "ready\n", mcbsp[id].id);
 522                         return -EAGAIN;
 523                 }
 524         }
 525
 526         /* Receiver is ready, let's read the dummy data */
 527         if (rx_word_length > OMAP_MCBSP_WORD_16)
 528                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 529         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 530
 531         return 0;
 532 }
 533 EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
 534
 535 int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 536 {
 537         u32 io_base, clock_word = 0;
 538         omap_mcbsp_word_length tx_word_length;
 539         omap_mcbsp_word_length rx_word_length;
 540         u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
 541
 542         if (!omap_mcbsp_check_valid_id(id)) {
 543                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 544                 return -ENODEV;
 545         }
 546
 547         io_base = mcbsp[id].io_base;
 548         tx_word_length = mcbsp[id].tx_word_length;
 549         rx_word_length = mcbsp[id].rx_word_length;
 550
 551         if (tx_word_length != rx_word_length)
 552                 return -EINVAL;
 553
 554         /* First we wait for the transmitter to be ready */
 555         spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 556         while (!(spcr2 & XRDY)) {
 557                 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 558                 if (attempts++ > 1000) {
 559                         /* We must reset the transmitter */
 560                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
 561                         udelay(10);
 562                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 563                         udelay(10);
 564                         dev_err(mcbsp[id].dev, "McBSP%d transmitter not "
 565                                 "ready\n", mcbsp[id].id);
 566                         return -EAGAIN;
 567                 }
 568         }
 569
 570         /* We first need to enable the bus clock */
 571         if (tx_word_length > OMAP_MCBSP_WORD_16)
 572                 OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16);
 573         OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff);
 574
 575         /* We wait for the receiver to be ready */
 576         spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 577         while (!(spcr1 & RRDY)) {
 578                 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 579                 if (attempts++ > 1000) {
 580                         /* We must reset the receiver */
 581                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
 582                         udelay(10);
 583                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 584                         udelay(10);
 585                         dev_err(mcbsp[id].dev, "McBSP%d receiver not "
 586                                 "ready\n", mcbsp[id].id);
 587                         return -EAGAIN;
 588                 }
 589         }
 590
 591         /* Receiver is ready, there is something for us */
 592         if (rx_word_length > OMAP_MCBSP_WORD_16)
 593                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 594         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 595
 596         word[0] = (word_lsb | (word_msb << 16));
 597
 598         return 0;
 599 }
 600 EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
 601
 602 /*
 603  * Simple DMA based buffer rx/tx routines.
 604  * Nothing fancy, just a single buffer tx/rx through DMA.
 605  * The DMA resources are released once the transfer is done.
 606  * For anything fancier, you should use your own customized DMA
 607  * routines and callbacks.
 608  */
 609 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer,
 610                                 unsigned int length)
 611 {
 612         int dma_tx_ch;
 613         int src_port = 0;
 614         int dest_port = 0;
 615         int sync_dev = 0;
 616
 617         if (!omap_mcbsp_check_valid_id(id)) {
 618                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 619                 return -ENODEV;
 620         }
 621
 622         if (omap_request_dma(mcbsp[id].dma_tx_sync, "McBSP TX",
 623                                 omap_mcbsp_tx_dma_callback,
 624                                 &mcbsp[id],
 625                                 &dma_tx_ch)) {
 626                 dev_err(mcbsp[id].dev, " Unable to request DMA channel for "
 627                                 "McBSP%d TX. Trying IRQ based TX\n",
 628                                 mcbsp[id].id);
 629                 return -EAGAIN;
 630         }
 631         mcbsp[id].dma_tx_lch = dma_tx_ch;
 632
 633         dev_err(mcbsp[id].dev, "McBSP%d TX DMA on channel %d\n", mcbsp[id].id,
 634                 dma_tx_ch);
 635
 636         init_completion(&(mcbsp[id].tx_dma_completion));
 637
 638         if (cpu_class_is_omap1()) {
 639                 src_port = OMAP_DMA_PORT_TIPB;
 640                 dest_port = OMAP_DMA_PORT_EMIFF;
 641         }
 642         if (cpu_class_is_omap2())
 643                 sync_dev = mcbsp[id].dma_tx_sync;
 644
 645         omap_set_dma_transfer_params(mcbsp[id].dma_tx_lch,
 646                                      OMAP_DMA_DATA_TYPE_S16,
 647                                      length >> 1, 1,
 648                                      OMAP_DMA_SYNC_ELEMENT,
 649          sync_dev, 0);
 650
 651         omap_set_dma_dest_params(mcbsp[id].dma_tx_lch,
 652                                  src_port,
 653                                  OMAP_DMA_AMODE_CONSTANT,
 654                                  mcbsp[id].io_base + OMAP_MCBSP_REG_DXR1,
 655                                  0, 0);
 656
 657         omap_set_dma_src_params(mcbsp[id].dma_tx_lch,
 658                                 dest_port,
 659                                 OMAP_DMA_AMODE_POST_INC,
 660                                 buffer,
 661                                 0, 0);
 662
 663         omap_start_dma(mcbsp[id].dma_tx_lch);
 664         wait_for_completion(&(mcbsp[id].tx_dma_completion));
 665
 666         return 0;
 667 }
 668 EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
 669
 670 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
 671                                 unsigned int length)
 672 {
 673         int dma_rx_ch;
 674         int src_port = 0;
 675         int dest_port = 0;
 676         int sync_dev = 0;
 677
 678         if (!omap_mcbsp_check_valid_id(id)) {
 679                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 680                 return -ENODEV;
 681         }
 682
 683         if (omap_request_dma(mcbsp[id].dma_rx_sync, "McBSP RX",
 684                                 omap_mcbsp_rx_dma_callback,
 685                                 &mcbsp[id],
 686                                 &dma_rx_ch)) {
 687                 dev_err(mcbsp[id].dev, "Unable to request DMA channel for "
 688                                 "McBSP%d RX. Trying IRQ based RX\n",
 689                                 mcbsp[id].id);
 690                 return -EAGAIN;
 691         }
 692         mcbsp[id].dma_rx_lch = dma_rx_ch;
 693
 694         dev_err(mcbsp[id].dev, "McBSP%d RX DMA on channel %d\n", mcbsp[id].id,
 695                 dma_rx_ch);
 696
 697         init_completion(&(mcbsp[id].rx_dma_completion));
 698
 699         if (cpu_class_is_omap1()) {
 700                 src_port = OMAP_DMA_PORT_TIPB;
 701                 dest_port = OMAP_DMA_PORT_EMIFF;
 702         }
 703         if (cpu_class_is_omap2())
 704                 sync_dev = mcbsp[id].dma_rx_sync;
 705
 706         omap_set_dma_transfer_params(mcbsp[id].dma_rx_lch,
 707                                         OMAP_DMA_DATA_TYPE_S16,
 708                                         length >> 1, 1,
 709                                         OMAP_DMA_SYNC_ELEMENT,
 710                                         sync_dev, 0);
 711
 712         omap_set_dma_src_params(mcbsp[id].dma_rx_lch,
 713                                 src_port,
 714                                 OMAP_DMA_AMODE_CONSTANT,
 715                                 mcbsp[id].io_base + OMAP_MCBSP_REG_DRR1,
 716                                 0, 0);
 717
 718         omap_set_dma_dest_params(mcbsp[id].dma_rx_lch,
 719                                         dest_port,
 720                                         OMAP_DMA_AMODE_POST_INC,
 721                                         buffer,
 722                                         0, 0);
 723
 724         omap_start_dma(mcbsp[id].dma_rx_lch);
 725         wait_for_completion(&(mcbsp[id].rx_dma_completion));
 726
 727         return 0;
 728 }
 729 EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
 730
 731 /*
 732  * SPI wrapper.
 733  * Since SPI setup is much simpler than the generic McBSP one,
 734  * this wrapper just need an omap_mcbsp_spi_cfg structure as an input.
 735  * Once this is done, you can call omap_mcbsp_start().
 736  */
 737 void omap_mcbsp_set_spi_mode(unsigned int id,
 738                                 const struct omap_mcbsp_spi_cfg *spi_cfg)
 739 {
 740         struct omap_mcbsp_reg_cfg mcbsp_cfg;
 741
 742         if (!omap_mcbsp_check_valid_id(id)) {
 743                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 744                 return;
 745         }
 746
 747         memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
 748
 749         /* SPI has only one frame */
 750         mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0));
 751         mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0));
 752
 753         /* Clock stop mode */
 754         if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY)
 755                 mcbsp_cfg.spcr1 |= (1 << 12);
 756         else
 757                 mcbsp_cfg.spcr1 |= (3 << 11);
 758
 759         /* Set clock parities */
 760         if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 761                 mcbsp_cfg.pcr0 |= CLKRP;
 762         else
 763                 mcbsp_cfg.pcr0 &= ~CLKRP;
 764
 765         if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 766                 mcbsp_cfg.pcr0 &= ~CLKXP;
 767         else
 768                 mcbsp_cfg.pcr0 |= CLKXP;
 769
 770         /* Set SCLKME to 0 and CLKSM to 1 */
 771         mcbsp_cfg.pcr0 &= ~SCLKME;
 772         mcbsp_cfg.srgr2 |= CLKSM;
 773
 774         /* Set FSXP */
 775         if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH)
 776                 mcbsp_cfg.pcr0 &= ~FSXP;
 777         else
 778                 mcbsp_cfg.pcr0 |= FSXP;
 779
 780         if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) {
 781                 mcbsp_cfg.pcr0 |= CLKXM;
 782                 mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div - 1);
 783                 mcbsp_cfg.pcr0 |= FSXM;
 784                 mcbsp_cfg.srgr2 &= ~FSGM;
 785                 mcbsp_cfg.xcr2 |= XDATDLY(1);
 786                 mcbsp_cfg.rcr2 |= RDATDLY(1);
 787         } else {
 788                 mcbsp_cfg.pcr0 &= ~CLKXM;
 789                 mcbsp_cfg.srgr1 |= CLKGDV(1);
 790                 mcbsp_cfg.pcr0 &= ~FSXM;
 791                 mcbsp_cfg.xcr2 &= ~XDATDLY(3);
 792                 mcbsp_cfg.rcr2 &= ~RDATDLY(3);
 793         }
 794
 795         mcbsp_cfg.xcr2 &= ~XPHASE;
 796         mcbsp_cfg.rcr2 &= ~RPHASE;
 797
 798         omap_mcbsp_config(id, &mcbsp_cfg);
 799 }
 800 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
 801
 802 /*
 803  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
 804  * 730 has only 2 McBSP, and both of them are MPU peripherals.
 805  */
 806 static int __init omap_mcbsp_probe(struct platform_device *pdev)
 807 {
 808         struct omap_mcbsp_platform_data *pdata = pdev->dev.platform_data;
 809         int id = pdev->id - 1;
 810         int ret = 0;
 811
 812         if (!pdata) {
 813                 dev_err(&pdev->dev, "McBSP device initialized without"
 814                                 "platform data\n");
 815                 ret = -EINVAL;
 816                 goto exit;
 817         }
 818
 819         dev_dbg(&pdev->dev, "Initializing OMAP McBSP (%d).\n", pdev->id);
 820
 821         if (id >= OMAP_MAX_MCBSP_COUNT) {
 822                 dev_err(&pdev->dev, "Invalid McBSP device id (%d)\n", id);
 823                 ret = -EINVAL;
 824                 goto exit;
 825         }
 826
 827         spin_lock_init(&mcbsp[id].lock);
 828         mcbsp[id].id = id + 1;
 829         mcbsp[id].free = 1;
 830         mcbsp[id].dma_tx_lch = -1;
 831         mcbsp[id].dma_rx_lch = -1;
 832
 833         mcbsp[id].io_base = pdata->virt_base;
 834         /* Default I/O is IRQ based */
 835         mcbsp[id].io_type = OMAP_MCBSP_IRQ_IO;
 836         mcbsp[id].tx_irq = pdata->tx_irq;
 837         mcbsp[id].rx_irq = pdata->rx_irq;
 838         mcbsp[id].dma_rx_sync = pdata->dma_rx_sync;
 839         mcbsp[id].dma_tx_sync = pdata->dma_tx_sync;
 840
 841         if (pdata->clk_name)
 842                 mcbsp[id].clk = clk_get(&pdev->dev, pdata->clk_name);
 843         if (IS_ERR(mcbsp[id].clk)) {
 844                 mcbsp[id].free = 0;
 845                 dev_err(&pdev->dev,
 846                         "Invalid clock configuration for McBSP%d.\n",
 847                         mcbsp[id].id);
 848                 ret = -EINVAL;
 849                 goto exit;
 850         }
 851
 852         mcbsp[id].pdata = pdata;
 853         mcbsp[id].dev = &pdev->dev;
 854         platform_set_drvdata(pdev, &mcbsp[id]);
 855
 856 exit:
 857         return ret;
 858 }
 859
 860 static int omap_mcbsp_remove(struct platform_device *pdev)
 861 {
 862         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
 863
 864         platform_set_drvdata(pdev, NULL);
 865         if (mcbsp) {
 866
 867                 if (mcbsp->pdata && mcbsp->pdata->ops &&
 868                                 mcbsp->pdata->ops->free)
 869                         mcbsp->pdata->ops->free(mcbsp->id);
 870
 871                 clk_disable(mcbsp->clk);
 872                 clk_put(mcbsp->clk);
 873
 874                 mcbsp->clk = NULL;
 875                 mcbsp->free = 0;
 876                 mcbsp->dev = NULL;
 877         }
 878
 879         return 0;
 880 }
 881
 882 static struct platform_driver omap_mcbsp_driver = {
 883         .probe          = omap_mcbsp_probe,
 884         .remove         = omap_mcbsp_remove,
 885         .driver         = {
 886                 .name   = "omap-mcbsp",
 887         },
 888 };
 889
 890 int __init omap_mcbsp_init(void)
 891 {
 892         /* Register the McBSP driver */
 893         return platform_driver_register(&omap_mcbsp_driver);
 894 }
 895