git.oblomov.eu Git - linux-2.6/blob - arch/arm/plat-omap/mcbsp.c

   1 /*
   2  * linux/arch/arm/plat-omap/mcbsp.c
   3  *
   4  * Copyright (C) 2004 Nokia Corporation
   5  * Author: Samuel Ortiz <samuel.ortiz@nokia.com>
   6  *
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Multichannel mode not supported.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/device.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/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 <mach/dma.h>
  28 #include <mach/mcbsp.h>
  29
  30 struct omap_mcbsp **mcbsp_ptr;
  31 int omap_mcbsp_count;
  32
  33 void omap_mcbsp_write(void __iomem *io_base, u16 reg, u32 val)
  34 {
  35         if (cpu_class_is_omap1() || cpu_is_omap2420())
  36                 __raw_writew((u16)val, io_base + reg);
  37         else
  38                 __raw_writel(val, io_base + reg);
  39 }
  40
  41 int omap_mcbsp_read(void __iomem *io_base, u16 reg)
  42 {
  43         if (cpu_class_is_omap1() || cpu_is_omap2420())
  44                 return __raw_readw(io_base + reg);
  45         else
  46                 return __raw_readl(io_base + reg);
  47 }
  48
  49 #define OMAP_MCBSP_READ(base, reg) \
  50                         omap_mcbsp_read(base, OMAP_MCBSP_REG_##reg)
  51 #define OMAP_MCBSP_WRITE(base, reg, val) \
  52                         omap_mcbsp_write(base, OMAP_MCBSP_REG_##reg, val)
  53
  54 #define omap_mcbsp_check_valid_id(id)   (id < omap_mcbsp_count)
  55 #define id_to_mcbsp_ptr(id)             mcbsp_ptr[id];
  56
  57 static void omap_mcbsp_dump_reg(u8 id)
  58 {
  59         struct omap_mcbsp *mcbsp = id_to_mcbsp_ptr(id);
  60
  61         dev_dbg(mcbsp->dev, "**** McBSP%d regs ****\n", mcbsp->id);
  62         dev_dbg(mcbsp->dev, "DRR2:  0x%04x\n",
  63                         OMAP_MCBSP_READ(mcbsp->io_base, DRR2));
  64         dev_dbg(mcbsp->dev, "DRR1:  0x%04x\n",
  65                         OMAP_MCBSP_READ(mcbsp->io_base, DRR1));
  66         dev_dbg(mcbsp->dev, "DXR2:  0x%04x\n",
  67                         OMAP_MCBSP_READ(mcbsp->io_base, DXR2));
  68         dev_dbg(mcbsp->dev, "DXR1:  0x%04x\n",
  69                         OMAP_MCBSP_READ(mcbsp->io_base, DXR1));
  70         dev_dbg(mcbsp->dev, "SPCR2: 0x%04x\n",
  71                         OMAP_MCBSP_READ(mcbsp->io_base, SPCR2));
  72         dev_dbg(mcbsp->dev, "SPCR1: 0x%04x\n",
  73                         OMAP_MCBSP_READ(mcbsp->io_base, SPCR1));
  74         dev_dbg(mcbsp->dev, "RCR2:  0x%04x\n",
  75                         OMAP_MCBSP_READ(mcbsp->io_base, RCR2));
  76         dev_dbg(mcbsp->dev, "RCR1:  0x%04x\n",
  77                         OMAP_MCBSP_READ(mcbsp->io_base, RCR1));
  78         dev_dbg(mcbsp->dev, "XCR2:  0x%04x\n",
  79                         OMAP_MCBSP_READ(mcbsp->io_base, XCR2));
  80         dev_dbg(mcbsp->dev, "XCR1:  0x%04x\n",
  81                         OMAP_MCBSP_READ(mcbsp->io_base, XCR1));
  82         dev_dbg(mcbsp->dev, "SRGR2: 0x%04x\n",
  83                         OMAP_MCBSP_READ(mcbsp->io_base, SRGR2));
  84         dev_dbg(mcbsp->dev, "SRGR1: 0x%04x\n",
  85                         OMAP_MCBSP_READ(mcbsp->io_base, SRGR1));
  86         dev_dbg(mcbsp->dev, "PCR0:  0x%04x\n",
  87                         OMAP_MCBSP_READ(mcbsp->io_base, PCR0));
  88         dev_dbg(mcbsp->dev, "***********************\n");
  89 }
  90
  91 static irqreturn_t omap_mcbsp_tx_irq_handler(int irq, void *dev_id)
  92 {
  93         struct omap_mcbsp *mcbsp_tx = dev_id;
  94
  95         dev_dbg(mcbsp_tx->dev, "TX IRQ callback : 0x%x\n",
  96                 OMAP_MCBSP_READ(mcbsp_tx->io_base, SPCR2));
  97
  98         complete(&mcbsp_tx->tx_irq_completion);
  99
 100         return IRQ_HANDLED;
 101 }
 102
 103 static irqreturn_t omap_mcbsp_rx_irq_handler(int irq, void *dev_id)
 104 {
 105         struct omap_mcbsp *mcbsp_rx = dev_id;
 106
 107         dev_dbg(mcbsp_rx->dev, "RX IRQ callback : 0x%x\n",
 108                 OMAP_MCBSP_READ(mcbsp_rx->io_base, SPCR2));
 109
 110         complete(&mcbsp_rx->rx_irq_completion);
 111
 112         return IRQ_HANDLED;
 113 }
 114
 115 static void omap_mcbsp_tx_dma_callback(int lch, u16 ch_status, void *data)
 116 {
 117         struct omap_mcbsp *mcbsp_dma_tx = data;
 118
 119         dev_dbg(mcbsp_dma_tx->dev, "TX DMA callback : 0x%x\n",
 120                 OMAP_MCBSP_READ(mcbsp_dma_tx->io_base, SPCR2));
 121
 122         /* We can free the channels */
 123         omap_free_dma(mcbsp_dma_tx->dma_tx_lch);
 124         mcbsp_dma_tx->dma_tx_lch = -1;
 125
 126         complete(&mcbsp_dma_tx->tx_dma_completion);
 127 }
 128
 129 static void omap_mcbsp_rx_dma_callback(int lch, u16 ch_status, void *data)
 130 {
 131         struct omap_mcbsp *mcbsp_dma_rx = data;
 132
 133         dev_dbg(mcbsp_dma_rx->dev, "RX DMA callback : 0x%x\n",
 134                 OMAP_MCBSP_READ(mcbsp_dma_rx->io_base, SPCR2));
 135
 136         /* We can free the channels */
 137         omap_free_dma(mcbsp_dma_rx->dma_rx_lch);
 138         mcbsp_dma_rx->dma_rx_lch = -1;
 139
 140         complete(&mcbsp_dma_rx->rx_dma_completion);
 141 }
 142
 143 /*
 144  * omap_mcbsp_config simply write a config to the
 145  * appropriate McBSP.
 146  * You either call this function or set the McBSP registers
 147  * by yourself before calling omap_mcbsp_start().
 148  */
 149 void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 150 {
 151         struct omap_mcbsp *mcbsp;
 152         void __iomem *io_base;
 153
 154         if (!omap_mcbsp_check_valid_id(id)) {
 155                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 156                 return;
 157         }
 158         mcbsp = id_to_mcbsp_ptr(id);
 159
 160         io_base = mcbsp->io_base;
 161         dev_dbg(mcbsp->dev, "Configuring McBSP%d  phys_base: 0x%08lx\n",
 162                         mcbsp->id, mcbsp->phys_base);
 163
 164         /* We write the given config */
 165         OMAP_MCBSP_WRITE(io_base, SPCR2, config->spcr2);
 166         OMAP_MCBSP_WRITE(io_base, SPCR1, config->spcr1);
 167         OMAP_MCBSP_WRITE(io_base, RCR2, config->rcr2);
 168         OMAP_MCBSP_WRITE(io_base, RCR1, config->rcr1);
 169         OMAP_MCBSP_WRITE(io_base, XCR2, config->xcr2);
 170         OMAP_MCBSP_WRITE(io_base, XCR1, config->xcr1);
 171         OMAP_MCBSP_WRITE(io_base, SRGR2, config->srgr2);
 172         OMAP_MCBSP_WRITE(io_base, SRGR1, config->srgr1);
 173         OMAP_MCBSP_WRITE(io_base, MCR2, config->mcr2);
 174         OMAP_MCBSP_WRITE(io_base, MCR1, config->mcr1);
 175         OMAP_MCBSP_WRITE(io_base, PCR0, config->pcr0);
 176         if (cpu_is_omap2430() || cpu_is_omap34xx()) {
 177                 OMAP_MCBSP_WRITE(io_base, XCCR, config->xccr);
 178                 OMAP_MCBSP_WRITE(io_base, RCCR, config->rccr);
 179         }
 180 }
 181 EXPORT_SYMBOL(omap_mcbsp_config);
 182
 183 /*
 184  * We can choose between IRQ based or polled IO.
 185  * This needs to be called before omap_mcbsp_request().
 186  */
 187 int omap_mcbsp_set_io_type(unsigned int id, omap_mcbsp_io_type_t io_type)
 188 {
 189         struct omap_mcbsp *mcbsp;
 190
 191         if (!omap_mcbsp_check_valid_id(id)) {
 192                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 193                 return -ENODEV;
 194         }
 195         mcbsp = id_to_mcbsp_ptr(id);
 196
 197         spin_lock(&mcbsp->lock);
 198
 199         if (!mcbsp->free) {
 200                 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
 201                         mcbsp->id);
 202                 spin_unlock(&mcbsp->lock);
 203                 return -EINVAL;
 204         }
 205
 206         mcbsp->io_type = io_type;
 207
 208         spin_unlock(&mcbsp->lock);
 209
 210         return 0;
 211 }
 212 EXPORT_SYMBOL(omap_mcbsp_set_io_type);
 213
 214 int omap_mcbsp_request(unsigned int id)
 215 {
 216         struct omap_mcbsp *mcbsp;
 217         int i;
 218         int err;
 219
 220         if (!omap_mcbsp_check_valid_id(id)) {
 221                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 222                 return -ENODEV;
 223         }
 224         mcbsp = id_to_mcbsp_ptr(id);
 225
 226         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->request)
 227                 mcbsp->pdata->ops->request(id);
 228
 229         for (i = 0; i < mcbsp->num_clks; i++)
 230                 clk_enable(mcbsp->clks[i]);
 231
 232         spin_lock(&mcbsp->lock);
 233         if (!mcbsp->free) {
 234                 dev_err(mcbsp->dev, "McBSP%d is currently in use\n",
 235                         mcbsp->id);
 236                 spin_unlock(&mcbsp->lock);
 237                 return -1;
 238         }
 239
 240         mcbsp->free = 0;
 241         spin_unlock(&mcbsp->lock);
 242
 243         /*
 244          * Make sure that transmitter, receiver and sample-rate generator are
 245          * not running before activating IRQs.
 246          */
 247         OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR1, 0);
 248         OMAP_MCBSP_WRITE(mcbsp->io_base, SPCR2, 0);
 249
 250         if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
 251                 /* We need to get IRQs here */
 252                 init_completion(&mcbsp->tx_irq_completion);
 253                 err = request_irq(mcbsp->tx_irq, omap_mcbsp_tx_irq_handler,
 254                                         0, "McBSP", (void *)mcbsp);
 255                 if (err != 0) {
 256                         dev_err(mcbsp->dev, "Unable to request TX IRQ %d "
 257                                         "for McBSP%d\n", mcbsp->tx_irq,
 258                                         mcbsp->id);
 259                         return err;
 260                 }
 261
 262                 init_completion(&mcbsp->rx_irq_completion);
 263                 err = request_irq(mcbsp->rx_irq, omap_mcbsp_rx_irq_handler,
 264                                         0, "McBSP", (void *)mcbsp);
 265                 if (err != 0) {
 266                         dev_err(mcbsp->dev, "Unable to request RX IRQ %d "
 267                                         "for McBSP%d\n", mcbsp->rx_irq,
 268                                         mcbsp->id);
 269                         free_irq(mcbsp->tx_irq, (void *)mcbsp);
 270                         return err;
 271                 }
 272         }
 273
 274         return 0;
 275 }
 276 EXPORT_SYMBOL(omap_mcbsp_request);
 277
 278 void omap_mcbsp_free(unsigned int id)
 279 {
 280         struct omap_mcbsp *mcbsp;
 281         int i;
 282
 283         if (!omap_mcbsp_check_valid_id(id)) {
 284                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 285                 return;
 286         }
 287         mcbsp = id_to_mcbsp_ptr(id);
 288
 289         if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
 290                 mcbsp->pdata->ops->free(id);
 291
 292         for (i = mcbsp->num_clks - 1; i >= 0; i--)
 293                 clk_disable(mcbsp->clks[i]);
 294
 295         spin_lock(&mcbsp->lock);
 296         if (mcbsp->free) {
 297                 dev_err(mcbsp->dev, "McBSP%d was not reserved\n",
 298                         mcbsp->id);
 299                 spin_unlock(&mcbsp->lock);
 300                 return;
 301         }
 302
 303         mcbsp->free = 1;
 304         spin_unlock(&mcbsp->lock);
 305
 306         if (mcbsp->io_type == OMAP_MCBSP_IRQ_IO) {
 307                 /* Free IRQs */
 308                 free_irq(mcbsp->rx_irq, (void *)mcbsp);
 309                 free_irq(mcbsp->tx_irq, (void *)mcbsp);
 310         }
 311 }
 312 EXPORT_SYMBOL(omap_mcbsp_free);
 313
 314 /*
 315  * Here we start the McBSP, by enabling the sample
 316  * generator, both transmitter and receivers,
 317  * and the frame sync.
 318  */
 319 void omap_mcbsp_start(unsigned int id)
 320 {
 321         struct omap_mcbsp *mcbsp;
 322         void __iomem *io_base;
 323         u16 w;
 324
 325         if (!omap_mcbsp_check_valid_id(id)) {
 326                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 327                 return;
 328         }
 329         mcbsp = id_to_mcbsp_ptr(id);
 330         io_base = mcbsp->io_base;
 331
 332         mcbsp->rx_word_length = (OMAP_MCBSP_READ(io_base, RCR1) >> 5) & 0x7;
 333         mcbsp->tx_word_length = (OMAP_MCBSP_READ(io_base, XCR1) >> 5) & 0x7;
 334
 335         /* Start the sample generator */
 336         w = OMAP_MCBSP_READ(io_base, SPCR2);
 337         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 6));
 338
 339         /* Enable transmitter and receiver */
 340         w = OMAP_MCBSP_READ(io_base, SPCR2);
 341         OMAP_MCBSP_WRITE(io_base, SPCR2, w | 1);
 342
 343         w = OMAP_MCBSP_READ(io_base, SPCR1);
 344         OMAP_MCBSP_WRITE(io_base, SPCR1, w | 1);
 345
 346         udelay(100);
 347
 348         /* Start frame sync */
 349         w = OMAP_MCBSP_READ(io_base, SPCR2);
 350         OMAP_MCBSP_WRITE(io_base, SPCR2, w | (1 << 7));
 351
 352         /* Dump McBSP Regs */
 353         omap_mcbsp_dump_reg(id);
 354 }
 355 EXPORT_SYMBOL(omap_mcbsp_start);
 356
 357 void omap_mcbsp_stop(unsigned int id)
 358 {
 359         struct omap_mcbsp *mcbsp;
 360         void __iomem *io_base;
 361         u16 w;
 362
 363         if (!omap_mcbsp_check_valid_id(id)) {
 364                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 365                 return;
 366         }
 367
 368         mcbsp = id_to_mcbsp_ptr(id);
 369         io_base = mcbsp->io_base;
 370
 371         /* Reset transmitter */
 372         w = OMAP_MCBSP_READ(io_base, SPCR2);
 373         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1));
 374
 375         /* Reset receiver */
 376         w = OMAP_MCBSP_READ(io_base, SPCR1);
 377         OMAP_MCBSP_WRITE(io_base, SPCR1, w & ~(1));
 378
 379         /* Reset the sample rate generator */
 380         w = OMAP_MCBSP_READ(io_base, SPCR2);
 381         OMAP_MCBSP_WRITE(io_base, SPCR2, w & ~(1 << 6));
 382 }
 383 EXPORT_SYMBOL(omap_mcbsp_stop);
 384
 385 /* polled mcbsp i/o operations */
 386 int omap_mcbsp_pollwrite(unsigned int id, u16 buf)
 387 {
 388         struct omap_mcbsp *mcbsp;
 389         void __iomem *base;
 390
 391         if (!omap_mcbsp_check_valid_id(id)) {
 392                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 393                 return -ENODEV;
 394         }
 395
 396         mcbsp = id_to_mcbsp_ptr(id);
 397         base = mcbsp->io_base;
 398
 399         writew(buf, base + OMAP_MCBSP_REG_DXR1);
 400         /* if frame sync error - clear the error */
 401         if (readw(base + OMAP_MCBSP_REG_SPCR2) & XSYNC_ERR) {
 402                 /* clear error */
 403                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) & (~XSYNC_ERR),
 404                        base + OMAP_MCBSP_REG_SPCR2);
 405                 /* resend */
 406                 return -1;
 407         } else {
 408                 /* wait for transmit confirmation */
 409                 int attemps = 0;
 410                 while (!(readw(base + OMAP_MCBSP_REG_SPCR2) & XRDY)) {
 411                         if (attemps++ > 1000) {
 412                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) &
 413                                        (~XRST),
 414                                        base + OMAP_MCBSP_REG_SPCR2);
 415                                 udelay(10);
 416                                 writew(readw(base + OMAP_MCBSP_REG_SPCR2) |
 417                                        (XRST),
 418                                        base + OMAP_MCBSP_REG_SPCR2);
 419                                 udelay(10);
 420                                 dev_err(mcbsp->dev, "Could not write to"
 421                                         " McBSP%d Register\n", mcbsp->id);
 422                                 return -2;
 423                         }
 424                 }
 425         }
 426
 427         return 0;
 428 }
 429 EXPORT_SYMBOL(omap_mcbsp_pollwrite);
 430
 431 int omap_mcbsp_pollread(unsigned int id, u16 *buf)
 432 {
 433         struct omap_mcbsp *mcbsp;
 434         void __iomem *base;
 435
 436         if (!omap_mcbsp_check_valid_id(id)) {
 437                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 438                 return -ENODEV;
 439         }
 440         mcbsp = id_to_mcbsp_ptr(id);
 441
 442         base = mcbsp->io_base;
 443         /* if frame sync error - clear the error */
 444         if (readw(base + OMAP_MCBSP_REG_SPCR1) & RSYNC_ERR) {
 445                 /* clear error */
 446                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) & (~RSYNC_ERR),
 447                        base + OMAP_MCBSP_REG_SPCR1);
 448                 /* resend */
 449                 return -1;
 450         } else {
 451                 /* wait for recieve confirmation */
 452                 int attemps = 0;
 453                 while (!(readw(base + OMAP_MCBSP_REG_SPCR1) & RRDY)) {
 454                         if (attemps++ > 1000) {
 455                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) &
 456                                        (~RRST),
 457                                        base + OMAP_MCBSP_REG_SPCR1);
 458                                 udelay(10);
 459                                 writew(readw(base + OMAP_MCBSP_REG_SPCR1) |
 460                                        (RRST),
 461                                        base + OMAP_MCBSP_REG_SPCR1);
 462                                 udelay(10);
 463                                 dev_err(mcbsp->dev, "Could not read from"
 464                                         " McBSP%d Register\n", mcbsp->id);
 465                                 return -2;
 466                         }
 467                 }
 468         }
 469         *buf = readw(base + OMAP_MCBSP_REG_DRR1);
 470
 471         return 0;
 472 }
 473 EXPORT_SYMBOL(omap_mcbsp_pollread);
 474
 475 /*
 476  * IRQ based word transmission.
 477  */
 478 void omap_mcbsp_xmit_word(unsigned int id, u32 word)
 479 {
 480         struct omap_mcbsp *mcbsp;
 481         void __iomem *io_base;
 482         omap_mcbsp_word_length word_length;
 483
 484         if (!omap_mcbsp_check_valid_id(id)) {
 485                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 486                 return;
 487         }
 488
 489         mcbsp = id_to_mcbsp_ptr(id);
 490         io_base = mcbsp->io_base;
 491         word_length = mcbsp->tx_word_length;
 492
 493         wait_for_completion(&mcbsp->tx_irq_completion);
 494
 495         if (word_length > OMAP_MCBSP_WORD_16)
 496                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 497         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 498 }
 499 EXPORT_SYMBOL(omap_mcbsp_xmit_word);
 500
 501 u32 omap_mcbsp_recv_word(unsigned int id)
 502 {
 503         struct omap_mcbsp *mcbsp;
 504         void __iomem *io_base;
 505         u16 word_lsb, word_msb = 0;
 506         omap_mcbsp_word_length word_length;
 507
 508         if (!omap_mcbsp_check_valid_id(id)) {
 509                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 510                 return -ENODEV;
 511         }
 512         mcbsp = id_to_mcbsp_ptr(id);
 513
 514         word_length = mcbsp->rx_word_length;
 515         io_base = mcbsp->io_base;
 516
 517         wait_for_completion(&mcbsp->rx_irq_completion);
 518
 519         if (word_length > OMAP_MCBSP_WORD_16)
 520                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 521         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 522
 523         return (word_lsb | (word_msb << 16));
 524 }
 525 EXPORT_SYMBOL(omap_mcbsp_recv_word);
 526
 527 int omap_mcbsp_spi_master_xmit_word_poll(unsigned int id, u32 word)
 528 {
 529         struct omap_mcbsp *mcbsp;
 530         void __iomem *io_base;
 531         omap_mcbsp_word_length tx_word_length;
 532         omap_mcbsp_word_length rx_word_length;
 533         u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
 534
 535         if (!omap_mcbsp_check_valid_id(id)) {
 536                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 537                 return -ENODEV;
 538         }
 539         mcbsp = id_to_mcbsp_ptr(id);
 540         io_base = mcbsp->io_base;
 541         tx_word_length = mcbsp->tx_word_length;
 542         rx_word_length = mcbsp->rx_word_length;
 543
 544         if (tx_word_length != rx_word_length)
 545                 return -EINVAL;
 546
 547         /* First we wait for the transmitter to be ready */
 548         spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 549         while (!(spcr2 & XRDY)) {
 550                 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 551                 if (attempts++ > 1000) {
 552                         /* We must reset the transmitter */
 553                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
 554                         udelay(10);
 555                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 556                         udelay(10);
 557                         dev_err(mcbsp->dev, "McBSP%d transmitter not "
 558                                 "ready\n", mcbsp->id);
 559                         return -EAGAIN;
 560                 }
 561         }
 562
 563         /* Now we can push the data */
 564         if (tx_word_length > OMAP_MCBSP_WORD_16)
 565                 OMAP_MCBSP_WRITE(io_base, DXR2, word >> 16);
 566         OMAP_MCBSP_WRITE(io_base, DXR1, word & 0xffff);
 567
 568         /* We wait for the receiver to be ready */
 569         spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 570         while (!(spcr1 & RRDY)) {
 571                 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 572                 if (attempts++ > 1000) {
 573                         /* We must reset the receiver */
 574                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
 575                         udelay(10);
 576                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 577                         udelay(10);
 578                         dev_err(mcbsp->dev, "McBSP%d receiver not "
 579                                 "ready\n", mcbsp->id);
 580                         return -EAGAIN;
 581                 }
 582         }
 583
 584         /* Receiver is ready, let's read the dummy data */
 585         if (rx_word_length > OMAP_MCBSP_WORD_16)
 586                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 587         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 588
 589         return 0;
 590 }
 591 EXPORT_SYMBOL(omap_mcbsp_spi_master_xmit_word_poll);
 592
 593 int omap_mcbsp_spi_master_recv_word_poll(unsigned int id, u32 *word)
 594 {
 595         struct omap_mcbsp *mcbsp;
 596         u32 clock_word = 0;
 597         void __iomem *io_base;
 598         omap_mcbsp_word_length tx_word_length;
 599         omap_mcbsp_word_length rx_word_length;
 600         u16 spcr2, spcr1, attempts = 0, word_lsb, word_msb = 0;
 601
 602         if (!omap_mcbsp_check_valid_id(id)) {
 603                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 604                 return -ENODEV;
 605         }
 606
 607         mcbsp = id_to_mcbsp_ptr(id);
 608         io_base = mcbsp->io_base;
 609
 610         tx_word_length = mcbsp->tx_word_length;
 611         rx_word_length = mcbsp->rx_word_length;
 612
 613         if (tx_word_length != rx_word_length)
 614                 return -EINVAL;
 615
 616         /* First we wait for the transmitter to be ready */
 617         spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 618         while (!(spcr2 & XRDY)) {
 619                 spcr2 = OMAP_MCBSP_READ(io_base, SPCR2);
 620                 if (attempts++ > 1000) {
 621                         /* We must reset the transmitter */
 622                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 & (~XRST));
 623                         udelay(10);
 624                         OMAP_MCBSP_WRITE(io_base, SPCR2, spcr2 | XRST);
 625                         udelay(10);
 626                         dev_err(mcbsp->dev, "McBSP%d transmitter not "
 627                                 "ready\n", mcbsp->id);
 628                         return -EAGAIN;
 629                 }
 630         }
 631
 632         /* We first need to enable the bus clock */
 633         if (tx_word_length > OMAP_MCBSP_WORD_16)
 634                 OMAP_MCBSP_WRITE(io_base, DXR2, clock_word >> 16);
 635         OMAP_MCBSP_WRITE(io_base, DXR1, clock_word & 0xffff);
 636
 637         /* We wait for the receiver to be ready */
 638         spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 639         while (!(spcr1 & RRDY)) {
 640                 spcr1 = OMAP_MCBSP_READ(io_base, SPCR1);
 641                 if (attempts++ > 1000) {
 642                         /* We must reset the receiver */
 643                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 & (~RRST));
 644                         udelay(10);
 645                         OMAP_MCBSP_WRITE(io_base, SPCR1, spcr1 | RRST);
 646                         udelay(10);
 647                         dev_err(mcbsp->dev, "McBSP%d receiver not "
 648                                 "ready\n", mcbsp->id);
 649                         return -EAGAIN;
 650                 }
 651         }
 652
 653         /* Receiver is ready, there is something for us */
 654         if (rx_word_length > OMAP_MCBSP_WORD_16)
 655                 word_msb = OMAP_MCBSP_READ(io_base, DRR2);
 656         word_lsb = OMAP_MCBSP_READ(io_base, DRR1);
 657
 658         word[0] = (word_lsb | (word_msb << 16));
 659
 660         return 0;
 661 }
 662 EXPORT_SYMBOL(omap_mcbsp_spi_master_recv_word_poll);
 663
 664 /*
 665  * Simple DMA based buffer rx/tx routines.
 666  * Nothing fancy, just a single buffer tx/rx through DMA.
 667  * The DMA resources are released once the transfer is done.
 668  * For anything fancier, you should use your own customized DMA
 669  * routines and callbacks.
 670  */
 671 int omap_mcbsp_xmit_buffer(unsigned int id, dma_addr_t buffer,
 672                                 unsigned int length)
 673 {
 674         struct omap_mcbsp *mcbsp;
 675         int dma_tx_ch;
 676         int src_port = 0;
 677         int dest_port = 0;
 678         int sync_dev = 0;
 679
 680         if (!omap_mcbsp_check_valid_id(id)) {
 681                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 682                 return -ENODEV;
 683         }
 684         mcbsp = id_to_mcbsp_ptr(id);
 685
 686         if (omap_request_dma(mcbsp->dma_tx_sync, "McBSP TX",
 687                                 omap_mcbsp_tx_dma_callback,
 688                                 mcbsp,
 689                                 &dma_tx_ch)) {
 690                 dev_err(mcbsp->dev, " Unable to request DMA channel for "
 691                                 "McBSP%d TX. Trying IRQ based TX\n",
 692                                 mcbsp->id);
 693                 return -EAGAIN;
 694         }
 695         mcbsp->dma_tx_lch = dma_tx_ch;
 696
 697         dev_err(mcbsp->dev, "McBSP%d TX DMA on channel %d\n", mcbsp->id,
 698                 dma_tx_ch);
 699
 700         init_completion(&mcbsp->tx_dma_completion);
 701
 702         if (cpu_class_is_omap1()) {
 703                 src_port = OMAP_DMA_PORT_TIPB;
 704                 dest_port = OMAP_DMA_PORT_EMIFF;
 705         }
 706         if (cpu_class_is_omap2())
 707                 sync_dev = mcbsp->dma_tx_sync;
 708
 709         omap_set_dma_transfer_params(mcbsp->dma_tx_lch,
 710                                      OMAP_DMA_DATA_TYPE_S16,
 711                                      length >> 1, 1,
 712                                      OMAP_DMA_SYNC_ELEMENT,
 713          sync_dev, 0);
 714
 715         omap_set_dma_dest_params(mcbsp->dma_tx_lch,
 716                                  src_port,
 717                                  OMAP_DMA_AMODE_CONSTANT,
 718                                  mcbsp->phys_base + OMAP_MCBSP_REG_DXR1,
 719                                  0, 0);
 720
 721         omap_set_dma_src_params(mcbsp->dma_tx_lch,
 722                                 dest_port,
 723                                 OMAP_DMA_AMODE_POST_INC,
 724                                 buffer,
 725                                 0, 0);
 726
 727         omap_start_dma(mcbsp->dma_tx_lch);
 728         wait_for_completion(&mcbsp->tx_dma_completion);
 729
 730         return 0;
 731 }
 732 EXPORT_SYMBOL(omap_mcbsp_xmit_buffer);
 733
 734 int omap_mcbsp_recv_buffer(unsigned int id, dma_addr_t buffer,
 735                                 unsigned int length)
 736 {
 737         struct omap_mcbsp *mcbsp;
 738         int dma_rx_ch;
 739         int src_port = 0;
 740         int dest_port = 0;
 741         int sync_dev = 0;
 742
 743         if (!omap_mcbsp_check_valid_id(id)) {
 744                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 745                 return -ENODEV;
 746         }
 747         mcbsp = id_to_mcbsp_ptr(id);
 748
 749         if (omap_request_dma(mcbsp->dma_rx_sync, "McBSP RX",
 750                                 omap_mcbsp_rx_dma_callback,
 751                                 mcbsp,
 752                                 &dma_rx_ch)) {
 753                 dev_err(mcbsp->dev, "Unable to request DMA channel for "
 754                                 "McBSP%d RX. Trying IRQ based RX\n",
 755                                 mcbsp->id);
 756                 return -EAGAIN;
 757         }
 758         mcbsp->dma_rx_lch = dma_rx_ch;
 759
 760         dev_err(mcbsp->dev, "McBSP%d RX DMA on channel %d\n", mcbsp->id,
 761                 dma_rx_ch);
 762
 763         init_completion(&mcbsp->rx_dma_completion);
 764
 765         if (cpu_class_is_omap1()) {
 766                 src_port = OMAP_DMA_PORT_TIPB;
 767                 dest_port = OMAP_DMA_PORT_EMIFF;
 768         }
 769         if (cpu_class_is_omap2())
 770                 sync_dev = mcbsp->dma_rx_sync;
 771
 772         omap_set_dma_transfer_params(mcbsp->dma_rx_lch,
 773                                         OMAP_DMA_DATA_TYPE_S16,
 774                                         length >> 1, 1,
 775                                         OMAP_DMA_SYNC_ELEMENT,
 776                                         sync_dev, 0);
 777
 778         omap_set_dma_src_params(mcbsp->dma_rx_lch,
 779                                 src_port,
 780                                 OMAP_DMA_AMODE_CONSTANT,
 781                                 mcbsp->phys_base + OMAP_MCBSP_REG_DRR1,
 782                                 0, 0);
 783
 784         omap_set_dma_dest_params(mcbsp->dma_rx_lch,
 785                                         dest_port,
 786                                         OMAP_DMA_AMODE_POST_INC,
 787                                         buffer,
 788                                         0, 0);
 789
 790         omap_start_dma(mcbsp->dma_rx_lch);
 791         wait_for_completion(&mcbsp->rx_dma_completion);
 792
 793         return 0;
 794 }
 795 EXPORT_SYMBOL(omap_mcbsp_recv_buffer);
 796
 797 /*
 798  * SPI wrapper.
 799  * Since SPI setup is much simpler than the generic McBSP one,
 800  * this wrapper just need an omap_mcbsp_spi_cfg structure as an input.
 801  * Once this is done, you can call omap_mcbsp_start().
 802  */
 803 void omap_mcbsp_set_spi_mode(unsigned int id,
 804                                 const struct omap_mcbsp_spi_cfg *spi_cfg)
 805 {
 806         struct omap_mcbsp *mcbsp;
 807         struct omap_mcbsp_reg_cfg mcbsp_cfg;
 808
 809         if (!omap_mcbsp_check_valid_id(id)) {
 810                 printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
 811                 return;
 812         }
 813         mcbsp = id_to_mcbsp_ptr(id);
 814
 815         memset(&mcbsp_cfg, 0, sizeof(struct omap_mcbsp_reg_cfg));
 816
 817         /* SPI has only one frame */
 818         mcbsp_cfg.rcr1 |= (RWDLEN1(spi_cfg->word_length) | RFRLEN1(0));
 819         mcbsp_cfg.xcr1 |= (XWDLEN1(spi_cfg->word_length) | XFRLEN1(0));
 820
 821         /* Clock stop mode */
 822         if (spi_cfg->clk_stp_mode == OMAP_MCBSP_CLK_STP_MODE_NO_DELAY)
 823                 mcbsp_cfg.spcr1 |= (1 << 12);
 824         else
 825                 mcbsp_cfg.spcr1 |= (3 << 11);
 826
 827         /* Set clock parities */
 828         if (spi_cfg->rx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 829                 mcbsp_cfg.pcr0 |= CLKRP;
 830         else
 831                 mcbsp_cfg.pcr0 &= ~CLKRP;
 832
 833         if (spi_cfg->tx_clock_polarity == OMAP_MCBSP_CLK_RISING)
 834                 mcbsp_cfg.pcr0 &= ~CLKXP;
 835         else
 836                 mcbsp_cfg.pcr0 |= CLKXP;
 837
 838         /* Set SCLKME to 0 and CLKSM to 1 */
 839         mcbsp_cfg.pcr0 &= ~SCLKME;
 840         mcbsp_cfg.srgr2 |= CLKSM;
 841
 842         /* Set FSXP */
 843         if (spi_cfg->fsx_polarity == OMAP_MCBSP_FS_ACTIVE_HIGH)
 844                 mcbsp_cfg.pcr0 &= ~FSXP;
 845         else
 846                 mcbsp_cfg.pcr0 |= FSXP;
 847
 848         if (spi_cfg->spi_mode == OMAP_MCBSP_SPI_MASTER) {
 849                 mcbsp_cfg.pcr0 |= CLKXM;
 850                 mcbsp_cfg.srgr1 |= CLKGDV(spi_cfg->clk_div - 1);
 851                 mcbsp_cfg.pcr0 |= FSXM;
 852                 mcbsp_cfg.srgr2 &= ~FSGM;
 853                 mcbsp_cfg.xcr2 |= XDATDLY(1);
 854                 mcbsp_cfg.rcr2 |= RDATDLY(1);
 855         } else {
 856                 mcbsp_cfg.pcr0 &= ~CLKXM;
 857                 mcbsp_cfg.srgr1 |= CLKGDV(1);
 858                 mcbsp_cfg.pcr0 &= ~FSXM;
 859                 mcbsp_cfg.xcr2 &= ~XDATDLY(3);
 860                 mcbsp_cfg.rcr2 &= ~RDATDLY(3);
 861         }
 862
 863         mcbsp_cfg.xcr2 &= ~XPHASE;
 864         mcbsp_cfg.rcr2 &= ~RPHASE;
 865
 866         omap_mcbsp_config(id, &mcbsp_cfg);
 867 }
 868 EXPORT_SYMBOL(omap_mcbsp_set_spi_mode);
 869
 870 /*
 871  * McBSP1 and McBSP3 are directly mapped on 1610 and 1510.
 872  * 730 has only 2 McBSP, and both of them are MPU peripherals.
 873  */
 874 static int __devinit omap_mcbsp_probe(struct platform_device *pdev)
 875 {
 876         struct omap_mcbsp_platform_data *pdata = pdev->dev.platform_data;
 877         struct omap_mcbsp *mcbsp;
 878         int id = pdev->id - 1;
 879         int i;
 880         int ret = 0;
 881
 882         if (!pdata) {
 883                 dev_err(&pdev->dev, "McBSP device initialized without"
 884                                 "platform data\n");
 885                 ret = -EINVAL;
 886                 goto exit;
 887         }
 888
 889         dev_dbg(&pdev->dev, "Initializing OMAP McBSP (%d).\n", pdev->id);
 890
 891         if (id >= omap_mcbsp_count) {
 892                 dev_err(&pdev->dev, "Invalid McBSP device id (%d)\n", id);
 893                 ret = -EINVAL;
 894                 goto exit;
 895         }
 896
 897         mcbsp = kzalloc(sizeof(struct omap_mcbsp), GFP_KERNEL);
 898         if (!mcbsp) {
 899                 ret = -ENOMEM;
 900                 goto exit;
 901         }
 902         mcbsp_ptr[id] = mcbsp;
 903
 904         spin_lock_init(&mcbsp->lock);
 905         mcbsp->id = id + 1;
 906         mcbsp->free = 1;
 907         mcbsp->dma_tx_lch = -1;
 908         mcbsp->dma_rx_lch = -1;
 909
 910         mcbsp->phys_base = pdata->phys_base;
 911         mcbsp->io_base = ioremap(pdata->phys_base, SZ_4K);
 912         if (!mcbsp->io_base) {
 913                 ret = -ENOMEM;
 914                 goto err_ioremap;
 915         }
 916
 917         /* Default I/O is IRQ based */
 918         mcbsp->io_type = OMAP_MCBSP_IRQ_IO;
 919         mcbsp->tx_irq = pdata->tx_irq;
 920         mcbsp->rx_irq = pdata->rx_irq;
 921         mcbsp->dma_rx_sync = pdata->dma_rx_sync;
 922         mcbsp->dma_tx_sync = pdata->dma_tx_sync;
 923
 924         if (pdata->num_clks) {
 925                 mcbsp->num_clks = pdata->num_clks;
 926                 mcbsp->clks = kzalloc(mcbsp->num_clks * sizeof(struct clk *),
 927                                         GFP_KERNEL);
 928                 if (!mcbsp->clks) {
 929                         ret = -ENOMEM;
 930                         goto exit;
 931                 }
 932                 for (i = 0; i < mcbsp->num_clks; i++) {
 933                         mcbsp->clks[i] = clk_get(&pdev->dev, pdata->clk_names[i]);
 934                         if (IS_ERR(mcbsp->clks[i])) {
 935                                 dev_err(&pdev->dev,
 936                                         "Invalid %s configuration for McBSP%d.\n",
 937                                         pdata->clk_names[i], mcbsp->id);
 938                                 ret = PTR_ERR(mcbsp->clks[i]);
 939                                 goto err_clk;
 940                         }
 941                 }
 942
 943         }
 944
 945         mcbsp->pdata = pdata;
 946         mcbsp->dev = &pdev->dev;
 947         platform_set_drvdata(pdev, mcbsp);
 948         return 0;
 949
 950 err_clk:
 951         while (i--)
 952                 clk_put(mcbsp->clks[i]);
 953         kfree(mcbsp->clks);
 954         iounmap(mcbsp->io_base);
 955 err_ioremap:
 956         mcbsp->free = 0;
 957 exit:
 958         return ret;
 959 }
 960
 961 static int __devexit omap_mcbsp_remove(struct platform_device *pdev)
 962 {
 963         struct omap_mcbsp *mcbsp = platform_get_drvdata(pdev);
 964         int i;
 965
 966         platform_set_drvdata(pdev, NULL);
 967         if (mcbsp) {
 968
 969                 if (mcbsp->pdata && mcbsp->pdata->ops &&
 970                                 mcbsp->pdata->ops->free)
 971                         mcbsp->pdata->ops->free(mcbsp->id);
 972
 973                 for (i = mcbsp->num_clks - 1; i >= 0; i--) {
 974                         clk_disable(mcbsp->clks[i]);
 975                         clk_put(mcbsp->clks[i]);
 976                 }
 977
 978                 iounmap(mcbsp->io_base);
 979
 980                 if (mcbsp->num_clks) {
 981                         kfree(mcbsp->clks);
 982                         mcbsp->clks = NULL;
 983                         mcbsp->num_clks = 0;
 984                 }
 985                 mcbsp->free = 0;
 986                 mcbsp->dev = NULL;
 987         }
 988
 989         return 0;
 990 }
 991
 992 static struct platform_driver omap_mcbsp_driver = {
 993         .probe          = omap_mcbsp_probe,
 994         .remove         = __devexit_p(omap_mcbsp_remove),
 995         .driver         = {
 996                 .name   = "omap-mcbsp",
 997         },
 998 };
 999
1000 int __init omap_mcbsp_init(void)
1001 {
1002         /* Register the McBSP driver */
1003         return platform_driver_register(&omap_mcbsp_driver);
1004 }
1005