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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 #include <linux/clk.h>
  23 #include <linux/delay.h>
  24
  25 #include <asm/io.h>
  26 #include <asm/irq.h>
  27
  28 #include <asm/arch/dma.h>
  29 #include <asm/arch/mux.h>
  30 #include <asm/arch/irqs.h>
  31 #include <asm/arch/dsp_common.h>
  32 #include <asm/arch/mcbsp.h>
  33
  34 #ifdef CONFIG_MCBSP_DEBUG
  35 #define DBG(x...)       printk(x)
  36 #else
  37 #define DBG(x...)                       do { } while (0)
  38 #endif
  39
  40 struct omap_mcbsp {
  41         u32                          io_base;
  42         u8                           id;
  43         u8                           free;
  44         omap_mcbsp_word_length       rx_word_length;
  45         omap_mcbsp_word_length       tx_word_length;
  46
  47         omap_mcbsp_io_type_t         io_type; /* IRQ or poll */
  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 #ifdef CONFIG_ARCH_OMAP1
  69 static struct clk *mcbsp_dsp_ck = 0;
  70 static struct clk *mcbsp_api_ck = 0;
  71 static struct clk *mcbsp_dspxor_ck = 0;
  72 #endif
  73 #ifdef CONFIG_ARCH_OMAP2
  74 static struct clk *mcbsp1_ick = 0;
  75 static struct clk *mcbsp1_fck = 0;
  76 static struct clk *mcbsp2_ick = 0;
  77 static struct clk *mcbsp2_fck = 0;
  78 #endif
  79
  80 static void omap_mcbsp_dump_reg(u8 id)
  81 {
  82         DBG("**** MCBSP%d regs ****\n", mcbsp[id].id);
  83         DBG("DRR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR2));
  84         DBG("DRR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DRR1));
  85         DBG("DXR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR2));
  86         DBG("DXR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, DXR1));
  87         DBG("SPCR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR2));
  88         DBG("SPCR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SPCR1));
  89         DBG("RCR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR2));
  90         DBG("RCR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, RCR1));
  91         DBG("XCR2:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR2));
  92         DBG("XCR1:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, XCR1));
  93         DBG("SRGR2: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR2));
  94         DBG("SRGR1: 0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, SRGR1));
  95         DBG("PCR0:  0x%04x\n", OMAP_MCBSP_READ(mcbsp[id].io_base, PCR0));
  96         DBG("***********************\n");
  97 }
  98
  99 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
 100 {
 101         struct omap_mcbsp * mcbsp_tx = (struct omap_mcbsp *)(dev_id);
 102
 103         DBG("TX IRQ callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2));
 104
 105         complete(&mcbsp_tx->tx_irq_completion);
 106         return IRQ_HANDLED;
 107 }
 108
 109 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
 110 {
 111         struct omap_mcbsp * mcbsp_rx = (struct omap_mcbsp *)(dev_id);
 112
 113         DBG("RX IRQ callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2));
 114
 115         complete(&mcbsp_rx->rx_irq_completion);
 116         return IRQ_HANDLED;
 117 }
 118
 119 static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
 120 {
 121         struct omap_mcbsp * mcbsp_dma_tx = (struct omap_mcbsp *)(data);
 122
 123         DBG("TX DMA callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
 124
 125         /* We can free the channels */
 126         omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
 127         mcbsp_dma_tx->dma_tx_lch = -1;
 128
 129         complete(&mcbsp_dma_tx->tx_dma_completion);
 130 }
 131
 132 static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
 133 {
 134         struct omap_mcbsp * mcbsp_dma_rx = (struct omap_mcbsp *)(data);
 135
 136         DBG("RX DMA callback : 0x%x\n", OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
 137
 138         /* We can free the channels */
 139         omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
 140         mcbsp_dma_rx->dma_rx_lch = -1;
 141
 142         complete(&mcbsp_dma_rx->rx_dma_completion);
 143 }
 144
 145
 146 /*
 147  * omap_mcbsp_config simply write a config to the
 148  * appropriate McBSP.
 149  * You either call this function or set the McBSP registers
 150  * by yourself before calling omap_mcbsp_start().
 151  */
 152
 153 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg * config)
 154 {
 155         u32 io_base = mcbsp[id].io_base;
 156
 157         DBG("OMAP-McBSP: McBSP%d  io_base: 0x%8x\n", id+1, io_base);
 158
 159         /* We write the given config */
 160         OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
 161         OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
 162         OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
 163         OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
 164         OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
 165         OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
 166         OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
 167         OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
 168         OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
 169         OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
 170         OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
 171 }
 172
 173
 174
 175 static int omap_mcbsp_check(unsigned int id)
 176 {
 177         if (cpu_is_omap730()) {
 178                 if (id > OMAP_MAX_MCBSP_COUNT - 1) {
 179                        printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
 180                        return -1;
 181                 }
 182                 return 0;
 183         }
 184
 185         if (cpu_is_omap15xx() || cpu_is_omap16xx() || cpu_is_omap24xx()) {
 186                 if (id > OMAP_MAX_MCBSP_COUNT) {
 187                         printk(KERN_ERR "OMAP-McBSP: McBSP%d doesn't exist\n", id + 1);
 188                         return -1;
 189                 }
 190                 return 0;
 191         }
 192
 193         return -1;
 194 }
 195
 196 #ifdef CONFIG_ARCH_OMAP1
 197 static void omap_mcbsp_dsp_request(void)
 198 {
 199         if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
 200                 clk_enable(mcbsp_dsp_ck);
 201                 clk_enable(mcbsp_api_ck);
 202
 203                 /* enable 12MHz clock to mcbsp 1 & 3 */
 204                 clk_enable(mcbsp_dspxor_ck);
 205
 206                 /*
 207                  * DSP external peripheral reset
 208                  * FIXME: This should be moved to dsp code
 209                  */
 210                 __raw_writew(__raw_readw(DSP_RSTCT2) | 1 | 1 << 1,
 211                              DSP_RSTCT2);
 212         }
 213 }
 214
 215 static void omap_mcbsp_dsp_free(void)
 216 {
 217         if (cpu_is_omap15xx() || cpu_is_omap16xx()) {
 218                 clk_disable(mcbsp_dspxor_ck);
 219                 clk_disable(mcbsp_dsp_ck);
 220                 clk_disable(mcbsp_api_ck);
 221         }
 222 }
 223 #endif
 224
 225 #ifdef CONFIG_ARCH_OMAP2
 226 static void omap2_mcbsp2_mux_setup(void)
 227 {
 228         if (cpu_is_omap2420()) {
 229                 omap_cfg_reg(Y15_24XX_MCBSP2_CLKX);
 230                 omap_cfg_reg(R14_24XX_MCBSP2_FSX);
 231                 omap_cfg_reg(W15_24XX_MCBSP2_DR);
 232                 omap_cfg_reg(V15_24XX_MCBSP2_DX);
 233                 omap_cfg_reg(V14_24XX_GPIO117);
 234         }
 235         /*
 236          * Need to add MUX settings for OMAP 2430 SDP
 237          */
 238 }
 239 #endif
 240
 241 /*
 242  * We can choose between IRQ based or polled IO.
 243  * This needs to be called before omap_mcbsp_request().
 244  */
 245 int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
 246 {
 247         if (omap_mcbsp_check(id) < 0)
 248                 return -EINVAL;
 249
 250         spin_lock(&mcbsp[id].lock);
 251
 252         if (!mcbsp[id].free) {
 253                 printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1);
 254                 spin_unlock(&mcbsp[id].lock);
 255                 return -EINVAL;
 256         }
 257
 258         mcbsp[id].io_type = io_type;
 259
 260         spin_unlock(&mcbsp[id].lock);
 261
 262         return 0;
 263 }
 264
 265 int omap_mcbsp_request(unsigned int id)
 266 {
 267         int err;
 268
 269         if (omap_mcbsp_check(id) < 0)
 270                 return -EINVAL;
 271
 272 #ifdef CONFIG_ARCH_OMAP1
 273         /*
 274          * On 1510, 1610 and 1710, McBSP1 and McBSP3
 275          * are DSP public peripherals.
 276          */
 277         if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
 278                 omap_mcbsp_dsp_request();
 279 #endif
 280
 281 #ifdef CONFIG_ARCH_OMAP2
 282         if (cpu_is_omap24xx()) {
 283                 if (id == OMAP_MCBSP1) {
 284                         clk_enable(mcbsp1_ick);
 285                         clk_enable(mcbsp1_fck);
 286                 } else {
 287                         clk_enable(mcbsp2_ick);
 288                         clk_enable(mcbsp2_fck);
 289                 }
 290         }
 291 #endif
 292
 293         spin_lock(&mcbsp[id].lock);
 294         if (!mcbsp[id].free) {
 295                 printk (KERN_ERR "OMAP-McBSP: McBSP%d is currently in use\n", id + 1);
 296                 spin_unlock(&mcbsp[id].lock);
 297                 return -1;
 298         }
 299
 300         mcbsp[id].free = 0;
 301         spin_unlock(&mcbsp[id].lock);
 302
 303         if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
 304                 /* We need to get IRQs here */
 305                 err = request_irq(mcbsp[id].tx_irq, omap_mcbsp_tx_irq_handler, 0,
 306                                   "McBSP",
 307                                   (void *) (&mcbsp[id]));
 308                 if (err != 0) {
 309                         printk(KERN_ERR "OMAP-McBSP: Unable to request TX IRQ %d for McBSP%d\n",
 310                                mcbsp[id].tx_irq, mcbsp[id].id);
 311                         return err;
 312                 }
 313
 314                 init_completion(&(mcbsp[id].tx_irq_completion));
 315
 316
 317                 err = request_irq(mcbsp[id].rx_irq, omap_mcbsp_rx_irq_handler, 0,
 318                                   "McBSP",
 319                                   (void *) (&mcbsp[id]));
 320                 if (err != 0) {
 321                         printk(KERN_ERR "OMAP-McBSP: Unable to request RX IRQ %d for McBSP%d\n",
 322                                mcbsp[id].rx_irq, mcbsp[id].id);
 323                         free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
 324                         return err;
 325                 }
 326
 327                 init_completion(&(mcbsp[id].rx_irq_completion));
 328         }
 329
 330         return 0;
 331
 332 }
 333
 334 void omap_mcbsp_free(unsigned int id)
 335 {
 336         if (omap_mcbsp_check(id) < 0)
 337                 return;
 338
 339 #ifdef CONFIG_ARCH_OMAP1
 340         if (cpu_class_is_omap1()) {
 341                 if (id == OMAP_MCBSP1 || id == OMAP_MCBSP3)
 342                         omap_mcbsp_dsp_free();
 343         }
 344 #endif
 345
 346 #ifdef CONFIG_ARCH_OMAP2
 347         if (cpu_is_omap24xx()) {
 348                 if (id == OMAP_MCBSP1) {
 349                         clk_disable(mcbsp1_ick);
 350                         clk_disable(mcbsp1_fck);
 351                 } else {
 352                         clk_disable(mcbsp2_ick);
 353                         clk_disable(mcbsp2_fck);
 354                 }
 355         }
 356 #endif
 357
 358         spin_lock(&mcbsp[id].lock);
 359         if (mcbsp[id].free) {
 360                 printk (KERN_ERR "OMAP-McBSP: McBSP%d was not reserved\n", id + 1);
 361                 spin_unlock(&mcbsp[id].lock);
 362                 return;
 363         }
 364
 365         mcbsp[id].free = 1;
 366         spin_unlock(&mcbsp[id].lock);
 367
 368         if (mcbsp[id].io_type == OMAP_MCBSP_IRQ_IO) {
 369                 /* Free IRQs */
 370                 free_irq(mcbsp[id].rx_irq, (void *) (&mcbsp[id]));
 371                 free_irq(mcbsp[id].tx_irq, (void *) (&mcbsp[id]));
 372         }
 373 }
 374
 375 /*
 376  * Here we start the McBSP, by enabling the sample
 377  * generator, both transmitter and receivers,
 378  * and the frame sync.
 379  */
 380 void omap_mcbsp_start(unsigned int id)
 381 {
 382         u32 io_base;
 383         u16 w;
 384
 385         if (omap_mcbsp_check(id) < 0)
 386                 return;
 387
 388         io_base = mcbsp[id].io_base;
 389
 390         mcbsp[id].rx_word_length = ((OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7);
 391         mcbsp[id].tx_word_length = ((OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7);
 392
 393         /* Start the sample generator */
 394         w = OMAP_MCBSP_READ(io_base, SPCR2);
 395         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
 396
 397         /* Enable transmitter and receiver */
 398         w = OMAP_MCBSP_READ(io_base, SPCR2);
 399         OMAP_MCBSP_WRITE(io_base, SPCR2, w | 1);
 400
 401         w = OMAP_MCBSP_READ(io_base, SPCR1);
 402         OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1);
 403
 404         udelay(100);
 405
 406         /* Start frame sync */
 407         w = OMAP_MCBSP_READ(io_base, SPCR2);
 408         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
 409
 410         /* Dump McBSP Regs */
 411         omap_mcbsp_dump_reg(id);
 412
 413 }
 414
 415 void omap_mcbsp_stop(unsigned int id)
 416 {
 417         u32 io_base;
 418         u16 w;
 419
 420         if (omap_mcbsp_check(id) < 0)
 421                 return;
 422
 423         io_base = mcbsp[id].io_base;
 424
 425         /* Reset transmitter */
 426         w = OMAP_MCBSP_READ(io_base, SPCR2);
 427         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1));
 428
 429         /* Reset receiver */
 430         w = OMAP_MCBSP_READ(io_base, SPCR1);
 431         OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(1));
 432
 433         /* Reset the sample rate generator */
 434         w = OMAP_MCBSP_READ(io_base, SPCR2);
 435         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
 436 }
 437
 438
 439 /* polled mcbsp i/o operations */
 440 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 441 {
 442         u32 base = mcbsp[id].io_base;
 443         writew(buf, base + OMAP_MCBSP_REG_DXR1);
 444         /* if frame sync error - clear the error */
 445         if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
 446                 /* clear error */
 447                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
 448                        base + OMAP_MCBSP_REG_SPCR2);
 449                 /* resend */
 450                 return -1;
 451         } else {
 452                 /* wait for transmit confirmation */
 453                 int attemps = 0;
 454                 while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
 455                         if (attemps++ > 1000) {
 456                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
 457                                        (~XRST),
 458                                        base + OMAP_MCBSP_REG_SPCR2);
 459                                 udelay(10);
 460                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
 461                                        (XRST),
 462                                        base + OMAP_MCBSP_REG_SPCR2);
 463                                 udelay(10);
 464                                 printk(KERN_ERR
 465                                        " Could not write to McBSP Register\n");
 466                                 return -2;
 467                         }
 468                 }
 469         }
 470         return 0;
 471 }
 472
 473 int omap_mcbsp_pollread(unsigned int id, u16 * buf)
 474 {
 475         u32 base = mcbsp[id].io_base;
 476         /* if frame sync error - clear the error */
 477         if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
 478                 /* clear error */
 479                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR),
 480                        base + OMAP_MCBSP_REG_SPCR1);
 481                 /* resend */
 482                 return -1;
 483         } else {
 484                 /* wait for recieve confirmation */
 485                 int attemps = 0;
 486                 while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) {
 487                         if (attemps++ > 1000) {
 488                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) &
 489                                        (~RRST),
 490                                        base + OMAP_MCBSP_REG_SPCR1);
 491                                 udelay(10);
 492                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) |
 493                                        (RRST),
 494                                        base + OMAP_MCBSP_REG_SPCR1);
 495                                 udelay(10);
 496                                 printk(KERN_ERR
 497                                        " Could not read from McBSP Register\n");
 498                                 return -2;
 499                         }
 500                 }
 501         }
 502         *buf = readw(base + OMAP_MCBSP_REG_DRR1);
 503         return 0;
 504 }
 505
 506 /*
 507  * IRQ based word transmission.
 508  */
 509 void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 510 {
 511         u32 io_base;
 512         omap_mcbsp_word_length word_length = mcbsp[id].tx_word_length;
 513
 514         if (omap_mcbsp_check(id) < 0)
 515                 return;
 516
 517         io_base = mcbsp[id].io_base;
 518
 519         wait_for_completion(&(mcbsp[id].tx_irq_completion));
 520
 521         if (word_length > OMAP_MCBSP_WORD_16)
 522                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 523         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 524 }
 525
 526 u32 omap_mcbsp_recv_word(unsigned int id)
 527 {
 528         u32 io_base;
 529         u16 word_lsb, word_msb = 0;
 530         omap_mcbsp_word_length word_length = mcbsp[id].rx_word_length;
 531
 532         if (omap_mcbsp_check(id) < 0)
 533                 return -EINVAL;
 534
 535         io_base = mcbsp[id].io_base;
 536
 537         wait_for_completion(&(mcbsp[id].rx_irq_completion));
 538
 539         if (word_length > OMAP_MCBSP_WORD_16)
 540                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 541         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 542
 543         return (word_lsb | (word_msb << 16));
 544 }
 545
 546
 547 int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 548 {
 549         u32 io_base = mcbsp[id].io_base;
 550         omap_mcbsp_word_length tx_word_length = mcbsp[id].tx_word_length;
 551         omap_mcbsp_word_length rx_word_length = mcbsp[id].rx_word_length;
 552         u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
 553
 554         if (tx_word_length != rx_word_length)
 555                 return -EINVAL;
 556
 557         /* First we wait for the transmitter to be ready */
 558         spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 559         while (!(spcr2 & XRDY)) {
 560                 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 561                 if (attempts++ > 1000) {
 562                         /* We must reset the transmitter */
 563                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
 564                         udelay(10);
 565                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 566                         udelay(10);
 567                         printk("McBSP transmitter not ready\n");
 568                         return -EAGAIN;
 569                 }
 570         }
 571
 572         /* Now we can push the data */
 573         if (tx_word_length > OMAP_MCBSP_WORD_16)
 574                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 575         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 576
 577         /* We wait for the receiver to be ready */
 578         spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 579         while (!(spcr1 & RRDY)) {
 580                 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 581                 if (attempts++ > 1000) {
 582                         /* We must reset the receiver */
 583                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
 584                         udelay(10);
 585                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 586                         udelay(10);
 587                         printk("McBSP receiver not ready\n");
 588                         return -EAGAIN;
 589                 }
 590         }
 591
 592         /* Receiver is ready, let's read the dummy data */
 593         if (rx_word_length > OMAP_MCBSP_WORD_16)
 594                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 595         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 596
 597         return 0;
 598 }
 599
 600 int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 * word)
 601 {
 602         u32 io_base = mcbsp[id].io_base, clock_word = 0;
 603         omap_mcbsp_word_length tx_word_length = mcbsp[id].tx_word_length;
 604         omap_mcbsp_word_length rx_word_length = mcbsp[id].rx_word_length;
 605         u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
 606
 607         if (tx_word_length != rx_word_length)
 608                 return -EINVAL;
 609
 610         /* First we wait for the transmitter to be ready */
 611         spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 612         while (!(spcr2 & XRDY)) {
 613                 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 614                 if (attempts++ > 1000) {
 615                         /* We must reset the transmitter */
 616                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
 617                         udelay(10);
 618                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 619                         udelay(10);
 620                         printk("McBSP transmitter not ready\n");
 621                         return -EAGAIN;
 622                 }
 623         }
 624
 625         /* We first need to enable the bus clock */
 626         if (tx_word_length > OMAP_MCBSP_WORD_16)
 627                 OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16);
 628         OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff);
 629
 630         /* We wait for the receiver to be ready */
 631         spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 632         while (!(spcr1 & RRDY)) {
 633                 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 634                 if (attempts++ > 1000) {
 635                         /* We must reset the receiver */
 636                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
 637                         udelay(10);
 638                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 639                         udelay(10);
 640                         printk("McBSP receiver not ready\n");
 641                         return -EAGAIN;
 642                 }
 643         }
 644
 645         /* Receiver is ready, there is something for us */
 646         if (rx_word_length > OMAP_MCBSP_WORD_16)
 647                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 648         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 649
 650         word[0] = (word_lsb | (word_msb << 16));
 651
 652         return 0;
 653 }
 654
 655
 656 /*
 657  * Simple DMA based buffer rx/tx routines.
 658  * Nothing fancy, just a single buffer tx/rx through DMA.
 659  * The DMA resources are released once the transfer is done.
 660  * For anything fancier, you should use your own customized DMA
 661  * routines and callbacks.
 662  */
 663 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer, unsigned int length)
 664 {
 665         int dma_tx_ch;
 666         int src_port = 0;
 667         int dest_port = 0;
 668         int sync_dev = 0;
 669
 670         if (omap_mcbsp_check(id) < 0)
 671                 return -EINVAL;
 672
 673         if (omap_request_dma(mcbsp[id].dma_tx_sync, "McBSP TX", omap_mcbsp_tx_dma_callback,
 674                              &mcbsp[id],
 675                              &dma_tx_ch)) {
 676                 printk("OMAP-McBSP: Unable to request DMA channel for McBSP%d TX. Trying IRQ based TX\n", id+1);
 677                 return -EAGAIN;
 678         }
 679         mcbsp[id].dma_tx_lch = dma_tx_ch;
 680
 681         DBG("TX DMA on channel %d\n", dma_tx_ch);
 682
 683         init_completion(&(mcbsp[id].tx_dma_completion));
 684
 685         if (cpu_class_is_omap1()) {
 686                 src_port = OMAP_DMA_PORT_TIPB;
 687                 dest_port = OMAP_DMA_PORT_EMIFF;
 688         }
 689         if (cpu_is_omap24xx())
 690                 sync_dev = mcbsp[id].dma_tx_sync;
 691
 692         omap_set_dma_transfer_params(mcbsp[id].dma_tx_lch,
 693                                      OMAP_DMA_DATA_TYPE_S16,
 694                                      length >> 1, 1,
 695                                      OMAP_DMA_SYNC_ELEMENT,
 696          sync_dev, 0);
 697
 698         omap_set_dma_dest_params(mcbsp[id].dma_tx_lch,
 699                                  src_port,
 700                                  OMAP_DMA_AMODE_CONSTANT,
 701                                  mcbsp[id].io_base + OMAP_MCBSP_REG_DXR1,
 702                                  0, 0);
 703
 704         omap_set_dma_src_params(mcbsp[id].dma_tx_lch,
 705                                 dest_port,
 706                                 OMAP_DMA_AMODE_POST_INC,
 707                                 buffer,
 708                                 0, 0);
 709
 710         omap_start_dma(mcbsp[id].dma_tx_lch);
 711         wait_for_completion(&(mcbsp[id].tx_dma_completion));
 712         return 0;
 713 }
 714
 715
 716 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer, unsigned int length)
 717 {
 718         int dma_rx_ch;
 719         int src_port = 0;
 720         int dest_port = 0;
 721         int sync_dev = 0;
 722
 723         if (omap_mcbsp_check(id) < 0)
 724                 return -EINVAL;
 725
 726         if (omap_request_dma(mcbsp[id].dma_rx_sync, "McBSP RX", omap_mcbsp_rx_dma_callback,
 727                              &mcbsp[id],
 728                              &dma_rx_ch)) {
 729                 printk("Unable to request DMA channel for McBSP%d RX. Trying IRQ based RX\n", id+1);
 730                 return -EAGAIN;
 731         }
 732         mcbsp[id].dma_rx_lch = dma_rx_ch;
 733
 734         DBG("RX DMA on channel %d\n", dma_rx_ch);
 735
 736         init_completion(&(mcbsp[id].rx_dma_completion));
 737
 738         if (cpu_class_is_omap1()) {
 739                 src_port = OMAP_DMA_PORT_TIPB;
 740                 dest_port = OMAP_DMA_PORT_EMIFF;
 741         }
 742         if (cpu_is_omap24xx())
 743                 sync_dev = mcbsp[id].dma_rx_sync;
 744
 745         omap_set_dma_transfer_params(mcbsp[id].dma_rx_lch,
 746                                      OMAP_DMA_DATA_TYPE_S16,
 747                                      length >> 1, 1,
 748                                      OMAP_DMA_SYNC_ELEMENT,
 749          sync_dev, 0);
 750
 751         omap_set_dma_src_params(mcbsp[id].dma_rx_lch,
 752                                 src_port,
 753                                 OMAP_DMA_AMODE_CONSTANT,
 754                                 mcbsp[id].io_base + OMAP_MCBSP_REG_DRR1,
 755                                 0, 0);
 756
 757         omap_set_dma_dest_params(mcbsp[id].dma_rx_lch,
 758                                  dest_port,
 759                                  OMAP_DMA_AMODE_POST_INC,
 760                                  buffer,
 761                                  0, 0);
 762
 763         omap_start_dma(mcbsp[id].dma_rx_lch);
 764         wait_for_completion(&(mcbsp[id].rx_dma_completion));
 765         return 0;
 766 }
 767
 768
 769 /*
 770  * SPI wrapper.
 771  * Since SPI setup is much simpler than the generic McBSP one,
 772  * this wrapper just need an omap_mcbsp_spi_cfg structure as an input.
 773  * Once this is done, you can call omap_mcbsp_start().
 774  */
 775 void omap_mcbsp_set_spi_mode(unsigned int id, const struct omap_mcbsp_spi_cfg * spi_cfg)
 776 {
 777         struct omap_mcbsp_reg_cfg mcbsp_cfg;
 778
 779         if (omap_mcbsp_check(id) < 0)
 780                 return;
 781
 782         memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
 783
 784         /* SPI has only one frame */
 785         mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0));
 786         mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0));
 787
 788         /* Clock stop mode */
 789         if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY)
 790                 mcbsp_cfg.spcr1 |= (1 << 12);
 791         else
 792                 mcbsp_cfg.spcr1 |= (3 << 11);
 793
 794         /* Set clock parities */
 795         if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 796                 mcbsp_cfg.pcr0 |= CLKRP;
 797         else
 798                 mcbsp_cfg.pcr0 &= ~CLKRP;
 799
 800         if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 801                 mcbsp_cfg.pcr0 &= ~CLKXP;
 802         else
 803                 mcbsp_cfg.pcr0 |= CLKXP;
 804
 805         /* Set SCLKME to 0 and CLKSM to 1 */
 806         mcbsp_cfg.pcr0 &= ~SCLKME;
 807         mcbsp_cfg.srgr2 |= CLKSM;
 808
 809         /* Set FSXP */
 810         if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH)
 811                 mcbsp_cfg.pcr0 &= ~FSXP;
 812         else
 813                 mcbsp_cfg.pcr0 |= FSXP;
 814
 815         if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) {
 816                 mcbsp_cfg.pcr0 |= CLKXM;
 817                 mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div -1);
 818                 mcbsp_cfg.pcr0 |= FSXM;
 819                 mcbsp_cfg.srgr2 &= ~FSGM;
 820                 mcbsp_cfg.xcr2 |= XDATDLY(1);
 821                 mcbsp_cfg.rcr2 |= RDATDLY(1);
 822         }
 823         else {
 824                 mcbsp_cfg.pcr0 &= ~CLKXM;
 825                 mcbsp_cfg.srgr1 |= CLKGDV(1);
 826                 mcbsp_cfg.pcr0 &= ~FSXM;
 827                 mcbsp_cfg.xcr2 &= ~XDATDLY(3);
 828                 mcbsp_cfg.rcr2 &= ~RDATDLY(3);
 829         }
 830
 831         mcbsp_cfg.xcr2 &= ~XPHASE;
 832         mcbsp_cfg.rcr2 &= ~RPHASE;
 833
 834         omap_mcbsp_config(id, &mcbsp_cfg);
 835 }
 836
 837
 838 /*
 839  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
 840  * 730 has only 2 McBSP, and both of them are MPU peripherals.
 841  */
 842 struct omap_mcbsp_info {
 843         u32 virt_base;
 844         u8 dma_rx_sync, dma_tx_sync;
 845         u16 rx_irq, tx_irq;
 846 };
 847
 848 #ifdef CONFIG_ARCH_OMAP730
 849 static const struct omap_mcbsp_info mcbsp_730[] = {
 850         [0] = { .virt_base = io_p2v(OMAP730_MCBSP1_BASE),
 851                 .dma_rx_sync = OMAP_DMA_MCBSP1_RX,
 852                 .dma_tx_sync = OMAP_DMA_MCBSP1_TX,
 853                 .rx_irq = INT_730_McBSP1RX,
 854                 .tx_irq = INT_730_McBSP1TX },
 855         [1] = { .virt_base = io_p2v(OMAP730_MCBSP2_BASE),
 856                 .dma_rx_sync = OMAP_DMA_MCBSP3_RX,
 857                 .dma_tx_sync = OMAP_DMA_MCBSP3_TX,
 858                 .rx_irq = INT_730_McBSP2RX,
 859                 .tx_irq = INT_730_McBSP2TX },
 860 };
 861 #endif
 862
 863 #ifdef CONFIG_ARCH_OMAP15XX
 864 static const struct omap_mcbsp_info mcbsp_1510[] = {
 865         [0] = { .virt_base = OMAP1510_MCBSP1_BASE,
 866                 .dma_rx_sync = OMAP_DMA_MCBSP1_RX,
 867                 .dma_tx_sync = OMAP_DMA_MCBSP1_TX,
 868                 .rx_irq = INT_McBSP1RX,
 869                 .tx_irq = INT_McBSP1TX },
 870         [1] = { .virt_base = io_p2v(OMAP1510_MCBSP2_BASE),
 871                 .dma_rx_sync = OMAP_DMA_MCBSP2_RX,
 872                 .dma_tx_sync = OMAP_DMA_MCBSP2_TX,
 873                 .rx_irq = INT_1510_SPI_RX,
 874                 .tx_irq = INT_1510_SPI_TX },
 875         [2] = { .virt_base = OMAP1510_MCBSP3_BASE,
 876                 .dma_rx_sync = OMAP_DMA_MCBSP3_RX,
 877                 .dma_tx_sync = OMAP_DMA_MCBSP3_TX,
 878                 .rx_irq = INT_McBSP3RX,
 879                 .tx_irq = INT_McBSP3TX },
 880 };
 881 #endif
 882
 883 #if defined(CONFIG_ARCH_OMAP16XX)
 884 static const struct omap_mcbsp_info mcbsp_1610[] = {
 885         [0] = { .virt_base = OMAP1610_MCBSP1_BASE,
 886                 .dma_rx_sync = OMAP_DMA_MCBSP1_RX,
 887                 .dma_tx_sync = OMAP_DMA_MCBSP1_TX,
 888                 .rx_irq = INT_McBSP1RX,
 889                 .tx_irq = INT_McBSP1TX },
 890         [1] = { .virt_base = io_p2v(OMAP1610_MCBSP2_BASE),
 891                 .dma_rx_sync = OMAP_DMA_MCBSP2_RX,
 892                 .dma_tx_sync = OMAP_DMA_MCBSP2_TX,
 893                 .rx_irq = INT_1610_McBSP2_RX,
 894                 .tx_irq = INT_1610_McBSP2_TX },
 895         [2] = { .virt_base = OMAP1610_MCBSP3_BASE,
 896                 .dma_rx_sync = OMAP_DMA_MCBSP3_RX,
 897                 .dma_tx_sync = OMAP_DMA_MCBSP3_TX,
 898                 .rx_irq = INT_McBSP3RX,
 899                 .tx_irq = INT_McBSP3TX },
 900 };
 901 #endif
 902
 903 #if defined(CONFIG_ARCH_OMAP24XX)
 904 static const struct omap_mcbsp_info mcbsp_24xx[] = {
 905         [0] = { .virt_base = IO_ADDRESS(OMAP24XX_MCBSP1_BASE),
 906                 .dma_rx_sync = OMAP24XX_DMA_MCBSP1_RX,
 907                 .dma_tx_sync = OMAP24XX_DMA_MCBSP1_TX,
 908                 .rx_irq = INT_24XX_MCBSP1_IRQ_RX,
 909                 .tx_irq = INT_24XX_MCBSP1_IRQ_TX,
 910                 },
 911         [1] = { .virt_base = IO_ADDRESS(OMAP24XX_MCBSP2_BASE),
 912                 .dma_rx_sync = OMAP24XX_DMA_MCBSP2_RX,
 913                 .dma_tx_sync = OMAP24XX_DMA_MCBSP2_TX,
 914                 .rx_irq = INT_24XX_MCBSP2_IRQ_RX,
 915                 .tx_irq = INT_24XX_MCBSP2_IRQ_TX,
 916                 },
 917 };
 918 #endif
 919
 920 static int __init omap_mcbsp_init(void)
 921 {
 922         int mcbsp_count = 0, i;
 923         static const struct omap_mcbsp_info *mcbsp_info;
 924
 925         printk("Initializing OMAP McBSP system\n");
 926
 927 #ifdef CONFIG_ARCH_OMAP1
 928         mcbsp_dsp_ck = clk_get(0, "dsp_ck");
 929         if (IS_ERR(mcbsp_dsp_ck)) {
 930                 printk(KERN_ERR "mcbsp: could not acquire dsp_ck handle.\n");
 931                 return PTR_ERR(mcbsp_dsp_ck);
 932         }
 933         mcbsp_api_ck = clk_get(0, "api_ck");
 934         if (IS_ERR(mcbsp_api_ck)) {
 935                 printk(KERN_ERR "mcbsp: could not acquire api_ck handle.\n");
 936                 return PTR_ERR(mcbsp_api_ck);
 937         }
 938         mcbsp_dspxor_ck = clk_get(0, "dspxor_ck");
 939         if (IS_ERR(mcbsp_dspxor_ck)) {
 940                 printk(KERN_ERR "mcbsp: could not acquire dspxor_ck handle.\n");
 941                 return PTR_ERR(mcbsp_dspxor_ck);
 942         }
 943 #endif
 944 #ifdef CONFIG_ARCH_OMAP2
 945         mcbsp1_ick = clk_get(0, "mcbsp1_ick");
 946         if (IS_ERR(mcbsp1_ick)) {
 947                 printk(KERN_ERR "mcbsp: could not acquire mcbsp1_ick handle.\n");
 948                 return PTR_ERR(mcbsp1_ick);
 949         }
 950         mcbsp1_fck = clk_get(0, "mcbsp1_fck");
 951         if (IS_ERR(mcbsp1_fck)) {
 952                 printk(KERN_ERR "mcbsp: could not acquire mcbsp1_fck handle.\n");
 953                 return PTR_ERR(mcbsp1_fck);
 954         }
 955         mcbsp2_ick = clk_get(0, "mcbsp2_ick");
 956         if (IS_ERR(mcbsp2_ick)) {
 957                 printk(KERN_ERR "mcbsp: could not acquire mcbsp2_ick handle.\n");
 958                 return PTR_ERR(mcbsp2_ick);
 959         }
 960         mcbsp2_fck = clk_get(0, "mcbsp2_fck");
 961         if (IS_ERR(mcbsp2_fck)) {
 962                 printk(KERN_ERR "mcbsp: could not acquire mcbsp2_fck handle.\n");
 963                 return PTR_ERR(mcbsp2_fck);
 964         }
 965 #endif
 966
 967 #ifdef CONFIG_ARCH_OMAP730
 968         if (cpu_is_omap730()) {
 969                 mcbsp_info = mcbsp_730;
 970                 mcbsp_count = ARRAY_SIZE(mcbsp_730);
 971         }
 972 #endif
 973 #ifdef CONFIG_ARCH_OMAP15XX
 974         if (cpu_is_omap15xx()) {
 975                 mcbsp_info = mcbsp_1510;
 976                 mcbsp_count = ARRAY_SIZE(mcbsp_1510);
 977         }
 978 #endif
 979 #if defined(CONFIG_ARCH_OMAP16XX)
 980         if (cpu_is_omap16xx()) {
 981                 mcbsp_info = mcbsp_1610;
 982                 mcbsp_count = ARRAY_SIZE(mcbsp_1610);
 983         }
 984 #endif
 985 #if defined(CONFIG_ARCH_OMAP24XX)
 986         if (cpu_is_omap24xx()) {
 987                 mcbsp_info = mcbsp_24xx;
 988                 mcbsp_count = ARRAY_SIZE(mcbsp_24xx);
 989                 omap2_mcbsp2_mux_setup();
 990         }
 991 #endif
 992         for (i = 0; i < OMAP_MAX_MCBSP_COUNT ; i++) {
 993                 if (i >= mcbsp_count) {
 994                         mcbsp[i].io_base = 0;
 995                         mcbsp[i].free = 0;
 996                         continue;
 997                 }
 998                 mcbsp[i].id = i + 1;
 999                 mcbsp[i].free = 1;
1000                 mcbsp[i].dma_tx_lch = -1;
1001                 mcbsp[i].dma_rx_lch = -1;
1002
1003                 mcbsp[i].io_base = mcbsp_info[i].virt_base;
1004                 mcbsp[i].io_type = OMAP_MCBSP_IRQ_IO; /* Default I/O is IRQ based */
1005                 mcbsp[i].tx_irq = mcbsp_info[i].tx_irq;
1006                 mcbsp[i].rx_irq = mcbsp_info[i].rx_irq;
1007                 mcbsp[i].dma_rx_sync = mcbsp_info[i].dma_rx_sync;
1008                 mcbsp[i].dma_tx_sync = mcbsp_info[i].dma_tx_sync;
1009                 spin_lock_init(&mcbsp[i].lock);
1010         }
1011
1012         return 0;
1013 }
1014
1015 arch_initcall(omap_mcbsp_init);
1016
1017 EXPORT_SYMBOL(omap_mcbsp_config);
1018 EXPORT_SYMBOL(omap_mcbsp_request);
1019 EXPORT_SYMBOL(omap_mcbsp_set_io_type);
1020 EXPORT_SYMBOL(omap_mcbsp_free);
1021 EXPORT_SYMBOL(omap_mcbsp_start);
1022 EXPORT_SYMBOL(omap_mcbsp_stop);
1023 EXPORT_SYMBOL(omap_mcbsp_xmit_word);
1024 EXPORT_SYMBOL(omap_mcbsp_recv_word);
1025 EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
1026 EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
1027 EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
1028 EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
1029 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);