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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/wait.h>
  19 #include <linux/completion.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/err.h>
  22
  23 #include <asm/delay.h>
  24 #include <asm/io.h>
  25 #include <asm/irq.h>
  26
  27 #include <asm/arch/dma.h>
  28 #include <asm/arch/mux.h>
  29 #include <asm/arch/irqs.h>
  30 #include <asm/arch/dsp_common.h>
  31 #include <asm/arch/mcbsp.h>
  32
  33 #include <asm/hardware/clock.h>
  34
  35 #ifdef CONFIG_MCBSP_DEBUG
  36 #define DBG(x...)       printk(x)
  37 #else
  38 #define DBG(x...)       do { } while (0)
  39 #endif
  40
  41 struct omap_mcbsp {
  42         u32                          io_base;
  43         u8                           id;
  44         u8                           free;
  45         omap_mcbsp_word_length       rx_word_length;
  46         omap_mcbsp_word_length       tx_word_length;
  47
  48         /* IRQ based TX/RX */
  49         int                          rx_irq;
  50         int                          tx_irq;
  51
  52         /* DMA stuff */
  53         u8                           dma_rx_sync;
  54         short                        dma_rx_lch;
  55         u8                           dma_tx_sync;
  56         short                        dma_tx_lch;
  57
  58         /* Completion queues */
  59         struct completion            tx_irq_completion;
  60         struct completion            rx_irq_completion;
  61         struct completion            tx_dma_completion;
  62         struct completion            rx_dma_completion;
  63
  64         spinlock_t                   lock;
  65 };
  66
  67 static struct omap_mcbsp mcbsp[OMAP_MAX_MCBSP_COUNT];
  68 static struct clk *mcbsp_dsp_ck = 0;
  69 static struct clk *mcbsp_api_ck = 0;
  70 static struct clk *mcbsp_dspxor_ck = 0;
  71
  72
  73 static void omap_mcbsp_dump_reg(u8 id)
  74 {
  75         DBG("**** MCBSP%d regs ****\n", mcbsp[id].id);
  76         DBG("DRR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR2));
  77         DBG("DRR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR1));
  78         DBG("DXR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR2));
  79         DBG("DXR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR1));
  80         DBG("SPCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR2));
  81         DBG("SPCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR1));
  82         DBG("RCR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR2));
  83         DBG("RCR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR1));
  84         DBG("XCR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR2));
  85         DBG("XCR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR1));
  86         DBG("SRGR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR2));
  87         DBG("SRGR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR1));
  88         DBG("PCR0:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, PCR0));
  89         DBG("***********************\n");
  90 }
  91
  92
  93 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
  94 {
  95         struct omap_mcbsp * mcbsp_tx = (struct omap_mcbsp *)(dev_id);
  96
  97         DBG("TX IRQ callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2));
  98
  99         complete(&mcbsp_tx->tx_irq_completion);
 100         return IRQ_HANDLED;
 101 }
 102
 103 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id, struct pt_regs *regs)
 104 {
 105         struct omap_mcbsp * mcbsp_rx = (struct omap_mcbsp *)(dev_id);
 106
 107         DBG("RX IRQ callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2));
 108
 109         complete(&mcbsp_rx->rx_irq_completion);
 110         return IRQ_HANDLED;
 111 }
 112
 113
 114 static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
 115 {
 116         struct omap_mcbsp * mcbsp_dma_tx = (struct omap_mcbsp *)(data);
 117
 118         DBG("TX DMA callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
 119
 120         /* We can free the channels */
 121         omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
 122         mcbsp_dma_tx->dma_tx_lch = -1;
 123
 124         complete(&mcbsp_dma_tx->tx_dma_completion);
 125 }
 126
 127 static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
 128 {
 129         struct omap_mcbsp * mcbsp_dma_rx = (struct omap_mcbsp *)(data);
 130
 131         DBG("RX DMA callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
 132
 133         /* We can free the channels */
 134         omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
 135         mcbsp_dma_rx->dma_rx_lch = -1;
 136
 137         complete(&mcbsp_dma_rx->rx_dma_completion);
 138 }
 139
 140
 141 /*
 142  * omap_mcbsp_config simply write a config to the
 143  * appropriate McBSP.
 144  * You either call this function or set the McBSP registers
 145  * by yourself before calling omap_mcbsp_start().
 146  */
 147
 148 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg * config)
 149 {
 150         u32 io_base = mcbsp[id].io_base;
 151
 152         DBG("OMAP-McBSP: McBSP%d  io_base: 0x%8x\n", id+1, io_base);
 153
 154         /* We write the given config */
 155         OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
 156         OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
 157         OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
 158         OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
 159         OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
 160         OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
 161         OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
 162         OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
 163         OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
 164         OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
 165         OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
 166 }
 167
 168
 169
 170 static int omap_mcbsp_check(unsigned int id)
 171 {
 172         if (cpu_is_omap730()) {
 173                 if (id > OMAP_MAX_MCBSP_COUNT - 1) {
 174                        printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
 175                        return -1;
 176                 }
 177                 return 0;
 178         }
 179
 180         if (cpu_is_omap1510() || cpu_is_omap16xx()) {
 181                 if (id > OMAP_MAX_MCBSP_COUNT) {
 182                         printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
 183                         return -1;
 184                 }
 185                 return 0;
 186         }
 187
 188         return -1;
 189 }
 190
 191 static void omap_mcbsp_dsp_request(void)
 192 {
 193         if (cpu_is_omap1510() || cpu_is_omap16xx()) {
 194                 clk_use(mcbsp_dsp_ck);
 195                 clk_use(mcbsp_api_ck);
 196
 197                 /* enable 12MHz clock to mcbsp 1 & 3 */
 198                 clk_use(mcbsp_dspxor_ck);
 199
 200                 /*
 201                  * DSP external peripheral reset
 202                  * FIXME: This should be moved to dsp code
 203                  */
 204                 __raw_writew(__raw_readw(DSP_RSTCT2) | 1 | 1 << 1,
 205                              DSP_RSTCT2);
 206         }
 207 }
 208
 209 static void omap_mcbsp_dsp_free(void)
 210 {
 211         if (cpu_is_omap1510() || cpu_is_omap16xx()) {
 212                 clk_unuse(mcbsp_dspxor_ck);
 213                 clk_unuse(mcbsp_dsp_ck);
 214                 clk_unuse(mcbsp_api_ck);
 215         }
 216 }
 217
 218 int omap_mcbsp_request(unsigned int id)
 219 {
 220         int err;
 221
 222         if (omap_mcbsp_check(id) < 0)
 223                 return -EINVAL;
 224
 225         /*
 226          * On 1510, 1610 and 1710, McBSP1 and McBSP3
 227          * are DSP public peripherals.
 228          */
 229         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
 230                 omap_mcbsp_dsp_request();
 231
 232         spin_lock(&mcbsp[id].lock);
 233         if (!mcbsp[id].free) {
 234                 printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1);
 235                 spin_unlock(&mcbsp[id].lock);
 236                 return -1;
 237         }
 238
 239         mcbsp[id].free = 0;
 240         spin_unlock(&mcbsp[id].lock);
 241
 242         /* We need to get IRQs here */
 243         err = request_irq(mcbsp[id].tx_irq, omap_mcbsp_tx_irq_handler, 0,
 244                           "McBSP",
 245                           (void *) (&mcbsp[id]));
 246         if (err != 0) {
 247                 printk(KERN_ERR "OMAP-McBSP: Unable to request TX IRQ %d for McBSP%d\n",
 248                        mcbsp[id].tx_irq, mcbsp[id].id);
 249                 return err;
 250         }
 251
 252         init_completion(&(mcbsp[id].tx_irq_completion));
 253
 254
 255         err = request_irq(mcbsp[id].rx_irq, omap_mcbsp_rx_irq_handler, 0,
 256                           "McBSP",
 257                           (void *) (&mcbsp[id]));
 258         if (err != 0) {
 259                 printk(KERN_ERR "OMAP-McBSP: Unable to request RX IRQ %d for McBSP%d\n",
 260                        mcbsp[id].rx_irq, mcbsp[id].id);
 261                 free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
 262                 return err;
 263         }
 264
 265         init_completion(&(mcbsp[id].rx_irq_completion));
 266         return 0;
 267
 268 }
 269
 270 void omap_mcbsp_free(unsigned int id)
 271 {
 272         if (omap_mcbsp_check(id) < 0)
 273                 return;
 274
 275         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
 276                 omap_mcbsp_dsp_free();
 277
 278         spin_lock(&mcbsp[id].lock);
 279         if (mcbsp[id].free) {
 280                 printk (KERN_ERR "OMAP-McBSP: McBSP%d was not reserved\n", id + 1);
 281                 spin_unlock(&mcbsp[id].lock);
 282                 return;
 283         }
 284
 285         mcbsp[id].free = 1;
 286         spin_unlock(&mcbsp[id].lock);
 287
 288         /* Free IRQs */
 289         free_irq(mcbsp[id].rx_irq, (void *) (&mcbsp[id]));
 290         free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
 291 }
 292
 293 /*
 294  * Here we start the McBSP, by enabling the sample
 295  * generator, both transmitter and receivers,
 296  * and the frame sync.
 297  */
 298 void omap_mcbsp_start(unsigned int id)
 299 {
 300         u32 io_base;
 301         u16 w;
 302
 303         if (omap_mcbsp_check(id) < 0)
 304                 return;
 305
 306         io_base = mcbsp[id].io_base;
 307
 308         mcbsp[id].rx_word_length = ((OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7);
 309         mcbsp[id].tx_word_length = ((OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7);
 310
 311         /* Start the sample generator */
 312         w = OMAP_MCBSP_READ(io_base, SPCR2);
 313         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
 314
 315         /* Enable transmitter and receiver */
 316         w = OMAP_MCBSP_READ(io_base, SPCR2);
 317         OMAP_MCBSP_WRITE(io_base, SPCR2, w | 1);
 318
 319         w = OMAP_MCBSP_READ(io_base, SPCR1);
 320         OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1);
 321
 322         udelay(100);
 323
 324         /* Start frame sync */
 325         w = OMAP_MCBSP_READ(io_base, SPCR2);
 326         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
 327
 328         /* Dump McBSP Regs */
 329         omap_mcbsp_dump_reg(id);
 330
 331 }
 332
 333 void omap_mcbsp_stop(unsigned int id)
 334 {
 335         u32 io_base;
 336         u16 w;
 337
 338         if (omap_mcbsp_check(id) < 0)
 339                 return;
 340
 341         io_base = mcbsp[id].io_base;
 342
 343         /* Reset transmitter */
 344         w = OMAP_MCBSP_READ(io_base, SPCR2);
 345         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1));
 346
 347         /* Reset receiver */
 348         w = OMAP_MCBSP_READ(io_base, SPCR1);
 349         OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(1));
 350
 351         /* Reset the sample rate generator */
 352         w = OMAP_MCBSP_READ(io_base, SPCR2);
 353         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
 354 }
 355
 356
 357 /* polled mcbsp i/o operations */
 358 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 359 {
 360         u32 base = mcbsp[id].io_base;
 361         writew(buf, base + OMAP_MCBSP_REG_DXR1);
 362         /* if frame sync error - clear the error */
 363         if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
 364                 /* clear error */
 365                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
 366                        base + OMAP_MCBSP_REG_SPCR2);
 367                 /* resend */
 368                 return -1;
 369         } else {
 370                 /* wait for transmit confirmation */
 371                 int attemps = 0;
 372                 while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
 373                         if (attemps++ > 1000) {
 374                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
 375                                        (~XRST),
 376                                        base + OMAP_MCBSP_REG_SPCR2);
 377                                 udelay(10);
 378                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
 379                                        (XRST),
 380                                        base + OMAP_MCBSP_REG_SPCR2);
 381                                 udelay(10);
 382                                 printk(KERN_ERR
 383                                        " Could not write to McBSP Register\n");
 384                                 return -2;
 385                         }
 386                 }
 387         }
 388         return 0;
 389 }
 390
 391 int omap_mcbsp_pollread(unsigned int id, u16 * buf)
 392 {
 393         u32 base = mcbsp[id].io_base;
 394         /* if frame sync error - clear the error */
 395         if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
 396                 /* clear error */
 397                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR),
 398                        base + OMAP_MCBSP_REG_SPCR1);
 399                 /* resend */
 400                 return -1;
 401         } else {
 402                 /* wait for recieve confirmation */
 403                 int attemps = 0;
 404                 while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) {
 405                         if (attemps++ > 1000) {
 406                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) &
 407                                        (~RRST),
 408                                        base + OMAP_MCBSP_REG_SPCR1);
 409                                 udelay(10);
 410                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) |
 411                                        (RRST),
 412                                        base + OMAP_MCBSP_REG_SPCR1);
 413                                 udelay(10);
 414                                 printk(KERN_ERR
 415                                        " Could not read from McBSP Register\n");
 416                                 return -2;
 417                         }
 418                 }
 419         }
 420         *buf = readw(base + OMAP_MCBSP_REG_DRR1);
 421         return 0;
 422 }
 423
 424 /*
 425  * IRQ based word transmission.
 426  */
 427 void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 428 {
 429         u32 io_base;
 430         omap_mcbsp_word_length word_length = mcbsp[id].tx_word_length;
 431
 432         if (omap_mcbsp_check(id) < 0)
 433                 return;
 434
 435         io_base = mcbsp[id].io_base;
 436
 437         wait_for_completion(&(mcbsp[id].tx_irq_completion));
 438
 439         if (word_length > OMAP_MCBSP_WORD_16)
 440                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 441         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 442 }
 443
 444 u32 omap_mcbsp_recv_word(unsigned int id)
 445 {
 446         u32 io_base;
 447         u16 word_lsb, word_msb = 0;
 448         omap_mcbsp_word_length word_length = mcbsp[id].rx_word_length;
 449
 450         if (omap_mcbsp_check(id) < 0)
 451                 return -EINVAL;
 452
 453         io_base = mcbsp[id].io_base;
 454
 455         wait_for_completion(&(mcbsp[id].rx_irq_completion));
 456
 457         if (word_length > OMAP_MCBSP_WORD_16)
 458                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 459         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 460
 461         return (word_lsb | (word_msb << 16));
 462 }
 463
 464
 465 /*
 466  * Simple DMA based buffer rx/tx routines.
 467  * Nothing fancy, just a single buffer tx/rx through DMA.
 468  * The DMA resources are released once the transfer is done.
 469  * For anything fancier, you should use your own customized DMA
 470  * routines and callbacks.
 471  */
 472 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer, unsigned int length)
 473 {
 474         int dma_tx_ch;
 475
 476         if (omap_mcbsp_check(id) < 0)
 477                 return -EINVAL;
 478
 479         if (omap_request_dma(mcbsp[id].dma_tx_sync, "McBSP TX", omap_mcbsp_tx_dma_callback,
 480                              &mcbsp[id],
 481                              &dma_tx_ch)) {
 482                 printk("OMAP-McBSP: Unable to request DMA channel for McBSP%d TX. Trying IRQ based TX\n", id+1);
 483                 return -EAGAIN;
 484         }
 485         mcbsp[id].dma_tx_lch = dma_tx_ch;
 486
 487         DBG("TX DMA on channel %d\n", dma_tx_ch);
 488
 489         init_completion(&(mcbsp[id].tx_dma_completion));
 490
 491         omap_set_dma_transfer_params(mcbsp[id].dma_tx_lch,
 492                                      OMAP_DMA_DATA_TYPE_S16,
 493                                      length >> 1, 1,
 494                                      OMAP_DMA_SYNC_ELEMENT);
 495
 496         omap_set_dma_dest_params(mcbsp[id].dma_tx_lch,
 497                                  OMAP_DMA_PORT_TIPB,
 498                                  OMAP_DMA_AMODE_CONSTANT,
 499                                  mcbsp[id].io_base + OMAP_MCBSP_REG_DXR1);
 500
 501         omap_set_dma_src_params(mcbsp[id].dma_tx_lch,
 502                                 OMAP_DMA_PORT_EMIFF,
 503                                 OMAP_DMA_AMODE_POST_INC,
 504                                 buffer);
 505
 506         omap_start_dma(mcbsp[id].dma_tx_lch);
 507         wait_for_completion(&(mcbsp[id].tx_dma_completion));
 508         return 0;
 509 }
 510
 511
 512 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer, unsigned int length)
 513 {
 514         int dma_rx_ch;
 515
 516         if (omap_mcbsp_check(id) < 0)
 517                 return -EINVAL;
 518
 519         if (omap_request_dma(mcbsp[id].dma_rx_sync, "McBSP RX", omap_mcbsp_rx_dma_callback,
 520                              &mcbsp[id],
 521                              &dma_rx_ch)) {
 522                 printk("Unable to request DMA channel for McBSP%d RX. Trying IRQ based RX\n", id+1);
 523                 return -EAGAIN;
 524         }
 525         mcbsp[id].dma_rx_lch = dma_rx_ch;
 526
 527         DBG("RX DMA on channel %d\n", dma_rx_ch);
 528
 529         init_completion(&(mcbsp[id].rx_dma_completion));
 530
 531         omap_set_dma_transfer_params(mcbsp[id].dma_rx_lch,
 532                                      OMAP_DMA_DATA_TYPE_S16,
 533                                      length >> 1, 1,
 534                                      OMAP_DMA_SYNC_ELEMENT);
 535
 536         omap_set_dma_src_params(mcbsp[id].dma_rx_lch,
 537                                 OMAP_DMA_PORT_TIPB,
 538                                 OMAP_DMA_AMODE_CONSTANT,
 539                                 mcbsp[id].io_base + OMAP_MCBSP_REG_DRR1);
 540
 541         omap_set_dma_dest_params(mcbsp[id].dma_rx_lch,
 542                                  OMAP_DMA_PORT_EMIFF,
 543                                  OMAP_DMA_AMODE_POST_INC,
 544                                  buffer);
 545
 546         omap_start_dma(mcbsp[id].dma_rx_lch);
 547         wait_for_completion(&(mcbsp[id].rx_dma_completion));
 548         return 0;
 549 }
 550
 551
 552 /*
 553  * SPI wrapper.
 554  * Since SPI setup is much simpler than the generic McBSP one,
 555  * this wrapper just need an omap_mcbsp_spi_cfg structure as an input.
 556  * Once this is done, you can call omap_mcbsp_start().
 557  */
 558 void omap_mcbsp_set_spi_mode(unsigned int id, const struct omap_mcbsp_spi_cfg * spi_cfg)
 559 {
 560         struct omap_mcbsp_reg_cfg mcbsp_cfg;
 561
 562         if (omap_mcbsp_check(id) < 0)
 563                 return;
 564
 565         memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
 566
 567         /* SPI has only one frame */
 568         mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0));
 569         mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0));
 570
 571         /* Clock stop mode */
 572         if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY)
 573                 mcbsp_cfg.spcr1 |= (1 << 12);
 574         else
 575                 mcbsp_cfg.spcr1 |= (3 << 11);
 576
 577         /* Set clock parities */
 578         if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 579                 mcbsp_cfg.pcr0 |= CLKRP;
 580         else
 581                 mcbsp_cfg.pcr0 &= ~CLKRP;
 582
 583         if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 584                 mcbsp_cfg.pcr0 &= ~CLKXP;
 585         else
 586                 mcbsp_cfg.pcr0 |= CLKXP;
 587
 588         /* Set SCLKME to 0 and CLKSM to 1 */
 589         mcbsp_cfg.pcr0 &= ~SCLKME;
 590         mcbsp_cfg.srgr2 |= CLKSM;
 591
 592         /* Set FSXP */
 593         if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH)
 594                 mcbsp_cfg.pcr0 &= ~FSXP;
 595         else
 596                 mcbsp_cfg.pcr0 |= FSXP;
 597
 598         if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) {
 599                 mcbsp_cfg.pcr0 |= CLKXM;
 600                 mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div -1);
 601                 mcbsp_cfg.pcr0 |= FSXM;
 602                 mcbsp_cfg.srgr2 &= ~FSGM;
 603                 mcbsp_cfg.xcr2 |= XDATDLY(1);
 604                 mcbsp_cfg.rcr2 |= RDATDLY(1);
 605         }
 606         else {
 607                 mcbsp_cfg.pcr0 &= ~CLKXM;
 608                 mcbsp_cfg.srgr1 |= CLKGDV(1);
 609                 mcbsp_cfg.pcr0 &= ~FSXM;
 610                 mcbsp_cfg.xcr2 &= ~XDATDLY(3);
 611                 mcbsp_cfg.rcr2 &= ~RDATDLY(3);
 612         }
 613
 614         mcbsp_cfg.xcr2 &= ~XPHASE;
 615         mcbsp_cfg.rcr2 &= ~RPHASE;
 616
 617         omap_mcbsp_config(id, &mcbsp_cfg);
 618 }
 619
 620
 621 /*
 622  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
 623  * 730 has only 2 McBSP, and both of them are MPU peripherals.
 624  */
 625 struct omap_mcbsp_info {
 626         u32 virt_base;
 627         u8 dma_rx_sync, dma_tx_sync;
 628         u16 rx_irq, tx_irq;
 629 };
 630
 631 #ifdef CONFIG_ARCH_OMAP730
 632 static const struct omap_mcbsp_info mcbsp_730[] = {
 633         [0] = { .virt_base = io_p2v(OMAP730_MCBSP1_BASE),
 634                 .dma_rx_sync = OMAP_DMA_MCBSP1_RX,
 635                 .dma_tx_sync = OMAP_DMA_MCBSP1_TX,
 636                 .rx_irq = INT_730_McBSP1RX,
 637                 .tx_irq = INT_730_McBSP1TX },
 638         [1] = { .virt_base = io_p2v(OMAP730_MCBSP2_BASE),
 639                 .dma_rx_sync = OMAP_DMA_MCBSP3_RX,
 640                 .dma_tx_sync = OMAP_DMA_MCBSP3_TX,
 641                 .rx_irq = INT_730_McBSP2RX,
 642                 .tx_irq = INT_730_McBSP2TX },
 643 };
 644 #endif
 645
 646 #ifdef CONFIG_ARCH_OMAP1510
 647 static const struct omap_mcbsp_info mcbsp_1510[] = {
 648         [0] = { .virt_base = OMAP1510_MCBSP1_BASE,
 649                 .dma_rx_sync = OMAP_DMA_MCBSP1_RX,
 650                 .dma_tx_sync = OMAP_DMA_MCBSP1_TX,
 651                 .rx_irq = INT_McBSP1RX,
 652                 .tx_irq = INT_McBSP1TX },
 653         [1] = { .virt_base = io_p2v(OMAP1510_MCBSP2_BASE),
 654                 .dma_rx_sync = OMAP_DMA_MCBSP2_RX,
 655                 .dma_tx_sync = OMAP_DMA_MCBSP2_TX,
 656                 .rx_irq = INT_1510_SPI_RX,
 657                 .tx_irq = INT_1510_SPI_TX },
 658         [2] = { .virt_base = OMAP1510_MCBSP3_BASE,
 659                 .dma_rx_sync = OMAP_DMA_MCBSP3_RX,
 660                 .dma_tx_sync = OMAP_DMA_MCBSP3_TX,
 661                 .rx_irq = INT_McBSP3RX,
 662                 .tx_irq = INT_McBSP3TX },
 663 };
 664 #endif
 665
 666 #if defined(CONFIG_ARCH_OMAP16XX)
 667 static const struct omap_mcbsp_info mcbsp_1610[] = {
 668         [0] = { .virt_base = OMAP1610_MCBSP1_BASE,
 669                 .dma_rx_sync = OMAP_DMA_MCBSP1_RX,
 670                 .dma_tx_sync = OMAP_DMA_MCBSP1_TX,
 671                 .rx_irq = INT_McBSP1RX,
 672                 .tx_irq = INT_McBSP1TX },
 673         [1] = { .virt_base = io_p2v(OMAP1610_MCBSP2_BASE),
 674                 .dma_rx_sync = OMAP_DMA_MCBSP2_RX,
 675                 .dma_tx_sync = OMAP_DMA_MCBSP2_TX,
 676                 .rx_irq = INT_1610_McBSP2_RX,
 677                 .tx_irq = INT_1610_McBSP2_TX },
 678         [2] = { .virt_base = OMAP1610_MCBSP3_BASE,
 679                 .dma_rx_sync = OMAP_DMA_MCBSP3_RX,
 680                 .dma_tx_sync = OMAP_DMA_MCBSP3_TX,
 681                 .rx_irq = INT_McBSP3RX,
 682                 .tx_irq = INT_McBSP3TX },
 683 };
 684 #endif
 685
 686 static int __init omap_mcbsp_init(void)
 687 {
 688         int mcbsp_count = 0, i;
 689         static const struct omap_mcbsp_info *mcbsp_info;
 690
 691         printk("Initializing OMAP McBSP system\n");
 692
 693         mcbsp_dsp_ck = clk_get(0, "dsp_ck");
 694         if (IS_ERR(mcbsp_dsp_ck)) {
 695                 printk(KERN_ERR "mcbsp: could not acquire dsp_ck handle.\n");
 696                 return PTR_ERR(mcbsp_dsp_ck);
 697         }
 698         mcbsp_api_ck = clk_get(0, "api_ck");
 699         if (IS_ERR(mcbsp_api_ck)) {
 700                 printk(KERN_ERR "mcbsp: could not acquire api_ck handle.\n");
 701                 return PTR_ERR(mcbsp_api_ck);
 702         }
 703         mcbsp_dspxor_ck = clk_get(0, "dspxor_ck");
 704         if (IS_ERR(mcbsp_dspxor_ck)) {
 705                 printk(KERN_ERR "mcbsp: could not acquire dspxor_ck handle.\n");
 706                 return PTR_ERR(mcbsp_dspxor_ck);
 707         }
 708
 709 #ifdef CONFIG_ARCH_OMAP730
 710         if (cpu_is_omap730()) {
 711                 mcbsp_info = mcbsp_730;
 712                 mcbsp_count = ARRAY_SIZE(mcbsp_730);
 713         }
 714 #endif
 715 #ifdef CONFIG_ARCH_OMAP1510
 716         if (cpu_is_omap1510()) {
 717                 mcbsp_info = mcbsp_1510;
 718                 mcbsp_count = ARRAY_SIZE(mcbsp_1510);
 719         }
 720 #endif
 721 #if defined(CONFIG_ARCH_OMAP16XX)
 722         if (cpu_is_omap16xx()) {
 723                 mcbsp_info = mcbsp_1610;
 724                 mcbsp_count = ARRAY_SIZE(mcbsp_1610);
 725         }
 726 #endif
 727         for (i = 0; i < OMAP_MAX_MCBSP_COUNT ; i++) {
 728                 if (i >= mcbsp_count) {
 729                         mcbsp[i].io_base = 0;
 730                         mcbsp[i].free = 0;
 731                         continue;
 732                 }
 733                 mcbsp[i].id = i + 1;
 734                 mcbsp[i].free = 1;
 735                 mcbsp[i].dma_tx_lch = -1;
 736                 mcbsp[i].dma_rx_lch = -1;
 737
 738                 mcbsp[i].io_base = mcbsp_info[i].virt_base;
 739                 mcbsp[i].tx_irq = mcbsp_info[i].tx_irq;
 740                 mcbsp[i].rx_irq = mcbsp_info[i].rx_irq;
 741                 mcbsp[i].dma_rx_sync = mcbsp_info[i].dma_rx_sync;
 742                 mcbsp[i].dma_tx_sync = mcbsp_info[i].dma_tx_sync;
 743                 spin_lock_init(&mcbsp[i].lock);
 744         }
 745
 746         return 0;
 747 }
 748
 749
 750 arch_initcall(omap_mcbsp_init);
 751
 752 EXPORT_SYMBOL(omap_mcbsp_config);
 753 EXPORT_SYMBOL(omap_mcbsp_request);
 754 EXPORT_SYMBOL(omap_mcbsp_free);
 755 EXPORT_SYMBOL(omap_mcbsp_start);
 756 EXPORT_SYMBOL(omap_mcbsp_stop);
 757 EXPORT_SYMBOL(omap_mcbsp_xmit_word);
 758 EXPORT_SYMBOL(omap_mcbsp_recv_word);
 759 EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
 760 EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
 761 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);