linux/sound/soc/blackfin/bf5xx-sport.c
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   1/*
   2 * File:         bf5xx_sport.c
   3 * Based on:
   4 * Author:       Roy Huang <roy.huang@analog.com>
   5 *
   6 * Created:      Tue Sep 21 10:52:42 CEST 2004
   7 * Description:
   8 *               Blackfin SPORT Driver
   9 *
  10 *               Copyright 2004-2007 Analog Devices Inc.
  11 *
  12 * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13 *
  14 * This program is free software; you can redistribute it and/or modify
  15 * it under the terms of the GNU General Public License as published by
  16 * the Free Software Foundation; either version 2 of the License, or
  17 * (at your option) any later version.
  18 *
  19 * This program is distributed in the hope that it will be useful,
  20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22 * GNU General Public License for more details.
  23 *
  24 * You should have received a copy of the GNU General Public License
  25 * along with this program; if not, see the file COPYING, or write
  26 * to the Free Software Foundation, Inc.,
  27 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28 */
  29
  30#include <linux/kernel.h>
  31#include <linux/slab.h>
  32#include <linux/delay.h>
  33#include <linux/dma-mapping.h>
  34#include <linux/gpio.h>
  35#include <linux/bug.h>
  36#include <asm/portmux.h>
  37#include <asm/dma.h>
  38#include <asm/blackfin.h>
  39#include <asm/cacheflush.h>
  40
  41#include "bf5xx-sport.h"
  42/* delay between frame sync pulse and first data bit in multichannel mode */
  43#define FRAME_DELAY (1<<12)
  44
  45struct sport_device *sport_handle;
  46EXPORT_SYMBOL(sport_handle);
  47/* note: multichannel is in units of 8 channels,
  48 * tdm_count is # channels NOT / 8 ! */
  49int sport_set_multichannel(struct sport_device *sport,
  50                int tdm_count, u32 mask, int packed)
  51{
  52        pr_debug("%s tdm_count=%d mask:0x%08x packed=%d\n", __func__,
  53                        tdm_count, mask, packed);
  54
  55        if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
  56                return -EBUSY;
  57
  58        if (tdm_count & 0x7)
  59                return -EINVAL;
  60
  61        if (tdm_count > 32)
  62                return -EINVAL; /* Only support less than 32 channels now */
  63
  64        if (tdm_count) {
  65                sport->regs->mcmc1 = ((tdm_count>>3)-1) << 12;
  66                sport->regs->mcmc2 = FRAME_DELAY | MCMEN | \
  67                                (packed ? (MCDTXPE|MCDRXPE) : 0);
  68
  69                sport->regs->mtcs0 = mask;
  70                sport->regs->mrcs0 = mask;
  71                sport->regs->mtcs1 = 0;
  72                sport->regs->mrcs1 = 0;
  73                sport->regs->mtcs2 = 0;
  74                sport->regs->mrcs2 = 0;
  75                sport->regs->mtcs3 = 0;
  76                sport->regs->mrcs3 = 0;
  77        } else {
  78                sport->regs->mcmc1 = 0;
  79                sport->regs->mcmc2 = 0;
  80
  81                sport->regs->mtcs0 = 0;
  82                sport->regs->mrcs0 = 0;
  83        }
  84
  85        sport->regs->mtcs1 = 0; sport->regs->mtcs2 = 0; sport->regs->mtcs3 = 0;
  86        sport->regs->mrcs1 = 0; sport->regs->mrcs2 = 0; sport->regs->mrcs3 = 0;
  87
  88        SSYNC();
  89
  90        return 0;
  91}
  92EXPORT_SYMBOL(sport_set_multichannel);
  93
  94int sport_config_rx(struct sport_device *sport, unsigned int rcr1,
  95                unsigned int rcr2, unsigned int clkdiv, unsigned int fsdiv)
  96{
  97        if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
  98                return -EBUSY;
  99
 100        sport->regs->rcr1 = rcr1;
 101        sport->regs->rcr2 = rcr2;
 102        sport->regs->rclkdiv = clkdiv;
 103        sport->regs->rfsdiv = fsdiv;
 104
 105        SSYNC();
 106
 107        return 0;
 108}
 109EXPORT_SYMBOL(sport_config_rx);
 110
 111int sport_config_tx(struct sport_device *sport, unsigned int tcr1,
 112                unsigned int tcr2, unsigned int clkdiv, unsigned int fsdiv)
 113{
 114        if ((sport->regs->tcr1 & TSPEN) || (sport->regs->rcr1 & RSPEN))
 115                return -EBUSY;
 116
 117        sport->regs->tcr1 = tcr1;
 118        sport->regs->tcr2 = tcr2;
 119        sport->regs->tclkdiv = clkdiv;
 120        sport->regs->tfsdiv = fsdiv;
 121
 122        SSYNC();
 123
 124        return 0;
 125}
 126EXPORT_SYMBOL(sport_config_tx);
 127
 128static void setup_desc(struct dmasg *desc, void *buf, int fragcount,
 129                size_t fragsize, unsigned int cfg,
 130                unsigned int x_count, unsigned int ycount, size_t wdsize)
 131{
 132
 133        int i;
 134
 135        for (i = 0; i < fragcount; ++i) {
 136                desc[i].next_desc_addr  = (unsigned long)&(desc[i + 1]);
 137                desc[i].start_addr = (unsigned long)buf + i*fragsize;
 138                desc[i].cfg = cfg;
 139                desc[i].x_count = x_count;
 140                desc[i].x_modify = wdsize;
 141                desc[i].y_count = ycount;
 142                desc[i].y_modify = wdsize;
 143        }
 144
 145        /* make circular */
 146        desc[fragcount-1].next_desc_addr = (unsigned long)desc;
 147
 148        pr_debug("setup desc: desc0=%p, next0=%lx, desc1=%p,"
 149                "next1=%lx\nx_count=%x,y_count=%x,addr=0x%lx,cfs=0x%x\n",
 150                &(desc[0]), desc[0].next_desc_addr,
 151                &(desc[1]), desc[1].next_desc_addr,
 152                desc[0].x_count, desc[0].y_count,
 153                desc[0].start_addr, desc[0].cfg);
 154}
 155
 156static int sport_start(struct sport_device *sport)
 157{
 158        enable_dma(sport->dma_rx_chan);
 159        enable_dma(sport->dma_tx_chan);
 160        sport->regs->rcr1 |= RSPEN;
 161        sport->regs->tcr1 |= TSPEN;
 162        SSYNC();
 163
 164        return 0;
 165}
 166
 167static int sport_stop(struct sport_device *sport)
 168{
 169        sport->regs->tcr1 &= ~TSPEN;
 170        sport->regs->rcr1 &= ~RSPEN;
 171        SSYNC();
 172
 173        disable_dma(sport->dma_rx_chan);
 174        disable_dma(sport->dma_tx_chan);
 175        return 0;
 176}
 177
 178static inline int sport_hook_rx_dummy(struct sport_device *sport)
 179{
 180        struct dmasg *desc, temp_desc;
 181        unsigned long flags;
 182
 183        BUG_ON(sport->dummy_rx_desc == NULL);
 184        BUG_ON(sport->curr_rx_desc == sport->dummy_rx_desc);
 185
 186        /* Maybe the dummy buffer descriptor ring is damaged */
 187        sport->dummy_rx_desc->next_desc_addr = \
 188                        (unsigned long)(sport->dummy_rx_desc+1);
 189
 190        local_irq_save(flags);
 191        desc = (struct dmasg *)get_dma_next_desc_ptr(sport->dma_rx_chan);
 192        /* Copy the descriptor which will be damaged to backup */
 193        temp_desc = *desc;
 194        desc->x_count = 0xa;
 195        desc->y_count = 0;
 196        desc->next_desc_addr = (unsigned long)(sport->dummy_rx_desc);
 197        local_irq_restore(flags);
 198        /* Waiting for dummy buffer descriptor is already hooked*/
 199        while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
 200                        sizeof(struct dmasg)) !=
 201                        (unsigned long)sport->dummy_rx_desc)
 202                ;
 203        sport->curr_rx_desc = sport->dummy_rx_desc;
 204        /* Restore the damaged descriptor */
 205        *desc = temp_desc;
 206
 207        return 0;
 208}
 209
 210static inline int sport_rx_dma_start(struct sport_device *sport, int dummy)
 211{
 212        if (dummy) {
 213                sport->dummy_rx_desc->next_desc_addr = \
 214                                (unsigned long) sport->dummy_rx_desc;
 215                sport->curr_rx_desc = sport->dummy_rx_desc;
 216        } else
 217                sport->curr_rx_desc = sport->dma_rx_desc;
 218
 219        set_dma_next_desc_addr(sport->dma_rx_chan, \
 220                        (unsigned long)(sport->curr_rx_desc));
 221        set_dma_x_count(sport->dma_rx_chan, 0);
 222        set_dma_x_modify(sport->dma_rx_chan, 0);
 223        set_dma_config(sport->dma_rx_chan, (DMAFLOW_LARGE | NDSIZE_9 | \
 224                                WDSIZE_32 | WNR));
 225        set_dma_curr_addr(sport->dma_rx_chan, sport->curr_rx_desc->start_addr);
 226        SSYNC();
 227
 228        return 0;
 229}
 230
 231static inline int sport_tx_dma_start(struct sport_device *sport, int dummy)
 232{
 233        if (dummy) {
 234                sport->dummy_tx_desc->next_desc_addr = \
 235                                (unsigned long) sport->dummy_tx_desc;
 236                sport->curr_tx_desc = sport->dummy_tx_desc;
 237        } else
 238                sport->curr_tx_desc = sport->dma_tx_desc;
 239
 240        set_dma_next_desc_addr(sport->dma_tx_chan, \
 241                        (unsigned long)(sport->curr_tx_desc));
 242        set_dma_x_count(sport->dma_tx_chan, 0);
 243        set_dma_x_modify(sport->dma_tx_chan, 0);
 244        set_dma_config(sport->dma_tx_chan,
 245                        (DMAFLOW_LARGE | NDSIZE_9 | WDSIZE_32));
 246        set_dma_curr_addr(sport->dma_tx_chan, sport->curr_tx_desc->start_addr);
 247        SSYNC();
 248
 249        return 0;
 250}
 251
 252int sport_rx_start(struct sport_device *sport)
 253{
 254        unsigned long flags;
 255        pr_debug("%s enter\n", __func__);
 256        if (sport->rx_run)
 257                return -EBUSY;
 258        if (sport->tx_run) {
 259                /* tx is running, rx is not running */
 260                BUG_ON(sport->dma_rx_desc == NULL);
 261                BUG_ON(sport->curr_rx_desc != sport->dummy_rx_desc);
 262                local_irq_save(flags);
 263                while ((get_dma_curr_desc_ptr(sport->dma_rx_chan) -
 264                        sizeof(struct dmasg)) !=
 265                        (unsigned long)sport->dummy_rx_desc)
 266                        ;
 267                sport->dummy_rx_desc->next_desc_addr =
 268                                (unsigned long)(sport->dma_rx_desc);
 269                local_irq_restore(flags);
 270                sport->curr_rx_desc = sport->dma_rx_desc;
 271        } else {
 272                sport_tx_dma_start(sport, 1);
 273                sport_rx_dma_start(sport, 0);
 274                sport_start(sport);
 275        }
 276
 277        sport->rx_run = 1;
 278
 279        return 0;
 280}
 281EXPORT_SYMBOL(sport_rx_start);
 282
 283int sport_rx_stop(struct sport_device *sport)
 284{
 285        pr_debug("%s enter\n", __func__);
 286
 287        if (!sport->rx_run)
 288                return 0;
 289        if (sport->tx_run) {
 290                /* TX dma is still running, hook the dummy buffer */
 291                sport_hook_rx_dummy(sport);
 292        } else {
 293                /* Both rx and tx dma will be stopped */
 294                sport_stop(sport);
 295                sport->curr_rx_desc = NULL;
 296                sport->curr_tx_desc = NULL;
 297        }
 298
 299        sport->rx_run = 0;
 300
 301        return 0;
 302}
 303EXPORT_SYMBOL(sport_rx_stop);
 304
 305static inline int sport_hook_tx_dummy(struct sport_device *sport)
 306{
 307        struct dmasg *desc, temp_desc;
 308        unsigned long flags;
 309
 310        BUG_ON(sport->dummy_tx_desc == NULL);
 311        BUG_ON(sport->curr_tx_desc == sport->dummy_tx_desc);
 312
 313        sport->dummy_tx_desc->next_desc_addr = \
 314                        (unsigned long)(sport->dummy_tx_desc+1);
 315
 316        /* Shorten the time on last normal descriptor */
 317        local_irq_save(flags);
 318        desc = (struct dmasg *)get_dma_next_desc_ptr(sport->dma_tx_chan);
 319        /* Store the descriptor which will be damaged */
 320        temp_desc = *desc;
 321        desc->x_count = 0xa;
 322        desc->y_count = 0;
 323        desc->next_desc_addr = (unsigned long)(sport->dummy_tx_desc);
 324        local_irq_restore(flags);
 325        /* Waiting for dummy buffer descriptor is already hooked*/
 326        while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) - \
 327                        sizeof(struct dmasg)) != \
 328                        (unsigned long)sport->dummy_tx_desc)
 329                ;
 330        sport->curr_tx_desc = sport->dummy_tx_desc;
 331        /* Restore the damaged descriptor */
 332        *desc = temp_desc;
 333
 334        return 0;
 335}
 336
 337int sport_tx_start(struct sport_device *sport)
 338{
 339        unsigned flags;
 340        pr_debug("%s: tx_run:%d, rx_run:%d\n", __func__,
 341                        sport->tx_run, sport->rx_run);
 342        if (sport->tx_run)
 343                return -EBUSY;
 344        if (sport->rx_run) {
 345                BUG_ON(sport->dma_tx_desc == NULL);
 346                BUG_ON(sport->curr_tx_desc != sport->dummy_tx_desc);
 347                /* Hook the normal buffer descriptor */
 348                local_irq_save(flags);
 349                while ((get_dma_curr_desc_ptr(sport->dma_tx_chan) -
 350                        sizeof(struct dmasg)) !=
 351                        (unsigned long)sport->dummy_tx_desc)
 352                        ;
 353                sport->dummy_tx_desc->next_desc_addr =
 354                                (unsigned long)(sport->dma_tx_desc);
 355                local_irq_restore(flags);
 356                sport->curr_tx_desc = sport->dma_tx_desc;
 357        } else {
 358
 359                sport_tx_dma_start(sport, 0);
 360                /* Let rx dma run the dummy buffer */
 361                sport_rx_dma_start(sport, 1);
 362                sport_start(sport);
 363        }
 364        sport->tx_run = 1;
 365        return 0;
 366}
 367EXPORT_SYMBOL(sport_tx_start);
 368
 369int sport_tx_stop(struct sport_device *sport)
 370{
 371        if (!sport->tx_run)
 372                return 0;
 373        if (sport->rx_run) {
 374                /* RX is still running, hook the dummy buffer */
 375                sport_hook_tx_dummy(sport);
 376        } else {
 377                /* Both rx and tx dma stopped */
 378                sport_stop(sport);
 379                sport->curr_rx_desc = NULL;
 380                sport->curr_tx_desc = NULL;
 381        }
 382
 383        sport->tx_run = 0;
 384
 385        return 0;
 386}
 387EXPORT_SYMBOL(sport_tx_stop);
 388
 389static inline int compute_wdsize(size_t wdsize)
 390{
 391        switch (wdsize) {
 392        case 1:
 393                return WDSIZE_8;
 394        case 2:
 395                return WDSIZE_16;
 396        case 4:
 397        default:
 398                return WDSIZE_32;
 399        }
 400}
 401
 402int sport_config_rx_dma(struct sport_device *sport, void *buf,
 403                int fragcount, size_t fragsize)
 404{
 405        unsigned int x_count;
 406        unsigned int y_count;
 407        unsigned int cfg;
 408        dma_addr_t addr;
 409
 410        pr_debug("%s buf:%p, frag:%d, fragsize:0x%lx\n", __func__, \
 411                        buf, fragcount, fragsize);
 412
 413        x_count = fragsize / sport->wdsize;
 414        y_count = 0;
 415
 416        /* for fragments larger than 64k words we use 2d dma,
 417         * denote fragecount as two numbers' mutliply and both of them
 418         * are less than 64k.*/
 419        if (x_count >= 0x10000) {
 420                int i, count = x_count;
 421
 422                for (i = 16; i > 0; i--) {
 423                        x_count = 1 << i;
 424                        if ((count & (x_count - 1)) == 0) {
 425                                y_count = count >> i;
 426                                if (y_count < 0x10000)
 427                                        break;
 428                        }
 429                }
 430                if (i == 0)
 431                        return -EINVAL;
 432        }
 433        pr_debug("%s(x_count:0x%x, y_count:0x%x)\n", __func__,
 434                        x_count, y_count);
 435
 436        if (sport->dma_rx_desc)
 437                dma_free_coherent(NULL, sport->rx_desc_bytes,
 438                                        sport->dma_rx_desc, 0);
 439
 440        /* Allocate a new descritor ring as current one. */
 441        sport->dma_rx_desc = dma_alloc_coherent(NULL, \
 442                        fragcount * sizeof(struct dmasg), &addr, 0);
 443        sport->rx_desc_bytes = fragcount * sizeof(struct dmasg);
 444
 445        if (!sport->dma_rx_desc) {
 446                pr_err("Failed to allocate memory for rx desc\n");
 447                return -ENOMEM;
 448        }
 449
 450        sport->rx_buf = buf;
 451        sport->rx_fragsize = fragsize;
 452        sport->rx_frags = fragcount;
 453
 454        cfg     = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | WNR | \
 455                  (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
 456
 457        if (y_count != 0)
 458                cfg |= DMA2D;
 459
 460        setup_desc(sport->dma_rx_desc, buf, fragcount, fragsize,
 461                        cfg|DMAEN, x_count, y_count, sport->wdsize);
 462
 463        return 0;
 464}
 465EXPORT_SYMBOL(sport_config_rx_dma);
 466
 467int sport_config_tx_dma(struct sport_device *sport, void *buf, \
 468                int fragcount, size_t fragsize)
 469{
 470        unsigned int x_count;
 471        unsigned int y_count;
 472        unsigned int cfg;
 473        dma_addr_t addr;
 474
 475        pr_debug("%s buf:%p, fragcount:%d, fragsize:0x%lx\n",
 476                        __func__, buf, fragcount, fragsize);
 477
 478        x_count = fragsize/sport->wdsize;
 479        y_count = 0;
 480
 481        /* for fragments larger than 64k words we use 2d dma,
 482         * denote fragecount as two numbers' mutliply and both of them
 483         * are less than 64k.*/
 484        if (x_count >= 0x10000) {
 485                int i, count = x_count;
 486
 487                for (i = 16; i > 0; i--) {
 488                        x_count = 1 << i;
 489                        if ((count & (x_count - 1)) == 0) {
 490                                y_count = count >> i;
 491                                if (y_count < 0x10000)
 492                                        break;
 493                        }
 494                }
 495                if (i == 0)
 496                        return -EINVAL;
 497        }
 498        pr_debug("%s x_count:0x%x, y_count:0x%x\n", __func__,
 499                        x_count, y_count);
 500
 501
 502        if (sport->dma_tx_desc) {
 503                dma_free_coherent(NULL, sport->tx_desc_bytes, \
 504                                sport->dma_tx_desc, 0);
 505        }
 506
 507        sport->dma_tx_desc = dma_alloc_coherent(NULL, \
 508                        fragcount * sizeof(struct dmasg), &addr, 0);
 509        sport->tx_desc_bytes = fragcount * sizeof(struct dmasg);
 510        if (!sport->dma_tx_desc) {
 511                pr_err("Failed to allocate memory for tx desc\n");
 512                return -ENOMEM;
 513        }
 514
 515        sport->tx_buf = buf;
 516        sport->tx_fragsize = fragsize;
 517        sport->tx_frags = fragcount;
 518        cfg     = 0x7000 | DI_EN | compute_wdsize(sport->wdsize) | \
 519                  (DESC_ELEMENT_COUNT << 8); /* large descriptor mode */
 520
 521        if (y_count != 0)
 522                cfg |= DMA2D;
 523
 524        setup_desc(sport->dma_tx_desc, buf, fragcount, fragsize,
 525                        cfg|DMAEN, x_count, y_count, sport->wdsize);
 526
 527        return 0;
 528}
 529EXPORT_SYMBOL(sport_config_tx_dma);
 530
 531/* setup dummy dma descriptor ring, which don't generate interrupts,
 532 * the x_modify is set to 0 */
 533static int sport_config_rx_dummy(struct sport_device *sport)
 534{
 535        struct dmasg *desc;
 536        unsigned config;
 537
 538        pr_debug("%s entered\n", __func__);
 539#if L1_DATA_A_LENGTH != 0
 540        desc = (struct dmasg *) l1_data_sram_alloc(2 * sizeof(*desc));
 541#else
 542        {
 543                dma_addr_t addr;
 544                desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
 545        }
 546#endif
 547        if (desc == NULL) {
 548                pr_err("Failed to allocate memory for dummy rx desc\n");
 549                return -ENOMEM;
 550        }
 551        memset(desc, 0, 2 * sizeof(*desc));
 552        sport->dummy_rx_desc = desc;
 553        desc->start_addr = (unsigned long)sport->dummy_buf;
 554        config = DMAFLOW_LARGE | NDSIZE_9 | compute_wdsize(sport->wdsize)
 555                 | WNR | DMAEN;
 556        desc->cfg = config;
 557        desc->x_count = sport->dummy_count/sport->wdsize;
 558        desc->x_modify = sport->wdsize;
 559        desc->y_count = 0;
 560        desc->y_modify = 0;
 561        memcpy(desc+1, desc, sizeof(*desc));
 562        desc->next_desc_addr = (unsigned long)(desc+1);
 563        desc[1].next_desc_addr = (unsigned long)desc;
 564        return 0;
 565}
 566
 567static int sport_config_tx_dummy(struct sport_device *sport)
 568{
 569        struct dmasg *desc;
 570        unsigned int config;
 571
 572        pr_debug("%s entered\n", __func__);
 573
 574#if L1_DATA_A_LENGTH != 0
 575        desc = (struct dmasg *) l1_data_sram_alloc(2 * sizeof(*desc));
 576#else
 577        {
 578                dma_addr_t addr;
 579                desc = dma_alloc_coherent(NULL, 2 * sizeof(*desc), &addr, 0);
 580        }
 581#endif
 582        if (!desc) {
 583                pr_err("Failed to allocate memory for dummy tx desc\n");
 584                return -ENOMEM;
 585        }
 586        memset(desc, 0, 2 * sizeof(*desc));
 587        sport->dummy_tx_desc = desc;
 588        desc->start_addr = (unsigned long)sport->dummy_buf + \
 589                sport->dummy_count;
 590        config = DMAFLOW_LARGE | NDSIZE_9 |
 591                 compute_wdsize(sport->wdsize) | DMAEN;
 592        desc->cfg = config;
 593        desc->x_count = sport->dummy_count/sport->wdsize;
 594        desc->x_modify = sport->wdsize;
 595        desc->y_count = 0;
 596        desc->y_modify = 0;
 597        memcpy(desc+1, desc, sizeof(*desc));
 598        desc->next_desc_addr = (unsigned long)(desc+1);
 599        desc[1].next_desc_addr = (unsigned long)desc;
 600        return 0;
 601}
 602
 603unsigned long sport_curr_offset_rx(struct sport_device *sport)
 604{
 605        unsigned long curr = get_dma_curr_addr(sport->dma_rx_chan);
 606
 607        return (unsigned char *)curr - sport->rx_buf;
 608}
 609EXPORT_SYMBOL(sport_curr_offset_rx);
 610
 611unsigned long sport_curr_offset_tx(struct sport_device *sport)
 612{
 613        unsigned long curr = get_dma_curr_addr(sport->dma_tx_chan);
 614
 615        return (unsigned char *)curr - sport->tx_buf;
 616}
 617EXPORT_SYMBOL(sport_curr_offset_tx);
 618
 619void sport_incfrag(struct sport_device *sport, int *frag, int tx)
 620{
 621        ++(*frag);
 622        if (tx == 1 && *frag == sport->tx_frags)
 623                *frag = 0;
 624
 625        if (tx == 0 && *frag == sport->rx_frags)
 626                *frag = 0;
 627}
 628EXPORT_SYMBOL(sport_incfrag);
 629
 630void sport_decfrag(struct sport_device *sport, int *frag, int tx)
 631{
 632        --(*frag);
 633        if (tx == 1 && *frag == 0)
 634                *frag = sport->tx_frags;
 635
 636        if (tx == 0 && *frag == 0)
 637                *frag = sport->rx_frags;
 638}
 639EXPORT_SYMBOL(sport_decfrag);
 640
 641static int sport_check_status(struct sport_device *sport,
 642                unsigned int *sport_stat,
 643                unsigned int *rx_stat,
 644                unsigned int *tx_stat)
 645{
 646        int status = 0;
 647
 648        if (sport_stat) {
 649                SSYNC();
 650                status = sport->regs->stat;
 651                if (status & (TOVF|TUVF|ROVF|RUVF))
 652                        sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
 653                SSYNC();
 654                *sport_stat = status;
 655        }
 656
 657        if (rx_stat) {
 658                SSYNC();
 659                status = get_dma_curr_irqstat(sport->dma_rx_chan);
 660                if (status & (DMA_DONE|DMA_ERR))
 661                        clear_dma_irqstat(sport->dma_rx_chan);
 662                SSYNC();
 663                *rx_stat = status;
 664        }
 665
 666        if (tx_stat) {
 667                SSYNC();
 668                status = get_dma_curr_irqstat(sport->dma_tx_chan);
 669                if (status & (DMA_DONE|DMA_ERR))
 670                        clear_dma_irqstat(sport->dma_tx_chan);
 671                SSYNC();
 672                *tx_stat = status;
 673        }
 674
 675        return 0;
 676}
 677
 678int  sport_dump_stat(struct sport_device *sport, char *buf, size_t len)
 679{
 680        int ret;
 681
 682        ret = snprintf(buf, len,
 683                        "sts: 0x%04x\n"
 684                        "rx dma %d sts: 0x%04x tx dma %d sts: 0x%04x\n",
 685                        sport->regs->stat,
 686                        sport->dma_rx_chan,
 687                        get_dma_curr_irqstat(sport->dma_rx_chan),
 688                        sport->dma_tx_chan,
 689                        get_dma_curr_irqstat(sport->dma_tx_chan));
 690        buf += ret;
 691        len -= ret;
 692
 693        ret += snprintf(buf, len,
 694                        "curr_rx_desc:0x%p, curr_tx_desc:0x%p\n"
 695                        "dma_rx_desc:0x%p, dma_tx_desc:0x%p\n"
 696                        "dummy_rx_desc:0x%p, dummy_tx_desc:0x%p\n",
 697                        sport->curr_rx_desc, sport->curr_tx_desc,
 698                        sport->dma_rx_desc, sport->dma_tx_desc,
 699                        sport->dummy_rx_desc, sport->dummy_tx_desc);
 700
 701        return ret;
 702}
 703
 704static irqreturn_t rx_handler(int irq, void *dev_id)
 705{
 706        unsigned int rx_stat;
 707        struct sport_device *sport = dev_id;
 708
 709        pr_debug("%s enter\n", __func__);
 710        sport_check_status(sport, NULL, &rx_stat, NULL);
 711        if (!(rx_stat & DMA_DONE))
 712                pr_err("rx dma is already stopped\n");
 713
 714        if (sport->rx_callback) {
 715                sport->rx_callback(sport->rx_data);
 716                return IRQ_HANDLED;
 717        }
 718
 719        return IRQ_NONE;
 720}
 721
 722static irqreturn_t tx_handler(int irq, void *dev_id)
 723{
 724        unsigned int tx_stat;
 725        struct sport_device *sport = dev_id;
 726        pr_debug("%s enter\n", __func__);
 727        sport_check_status(sport, NULL, NULL, &tx_stat);
 728        if (!(tx_stat & DMA_DONE)) {
 729                pr_err("tx dma is already stopped\n");
 730                return IRQ_HANDLED;
 731        }
 732        if (sport->tx_callback) {
 733                sport->tx_callback(sport->tx_data);
 734                return IRQ_HANDLED;
 735        }
 736
 737        return IRQ_NONE;
 738}
 739
 740static irqreturn_t err_handler(int irq, void *dev_id)
 741{
 742        unsigned int status = 0;
 743        struct sport_device *sport = dev_id;
 744
 745        pr_debug("%s\n", __func__);
 746        if (sport_check_status(sport, &status, NULL, NULL)) {
 747                pr_err("error checking status ??");
 748                return IRQ_NONE;
 749        }
 750
 751        if (status & (TOVF|TUVF|ROVF|RUVF)) {
 752                pr_info("sport status error:%s%s%s%s\n",
 753                                status & TOVF ? " TOVF" : "",
 754                                status & TUVF ? " TUVF" : "",
 755                                status & ROVF ? " ROVF" : "",
 756                                status & RUVF ? " RUVF" : "");
 757                if (status & TOVF || status & TUVF) {
 758                        disable_dma(sport->dma_tx_chan);
 759                        if (sport->tx_run)
 760                                sport_tx_dma_start(sport, 0);
 761                        else
 762                                sport_tx_dma_start(sport, 1);
 763                        enable_dma(sport->dma_tx_chan);
 764                } else {
 765                        disable_dma(sport->dma_rx_chan);
 766                        if (sport->rx_run)
 767                                sport_rx_dma_start(sport, 0);
 768                        else
 769                                sport_rx_dma_start(sport, 1);
 770                        enable_dma(sport->dma_rx_chan);
 771                }
 772        }
 773        status = sport->regs->stat;
 774        if (status & (TOVF|TUVF|ROVF|RUVF))
 775                sport->regs->stat = (status & (TOVF|TUVF|ROVF|RUVF));
 776        SSYNC();
 777
 778        if (sport->err_callback)
 779                sport->err_callback(sport->err_data);
 780
 781        return IRQ_HANDLED;
 782}
 783
 784int sport_set_rx_callback(struct sport_device *sport,
 785                       void (*rx_callback)(void *), void *rx_data)
 786{
 787        BUG_ON(rx_callback == NULL);
 788        sport->rx_callback = rx_callback;
 789        sport->rx_data = rx_data;
 790
 791        return 0;
 792}
 793EXPORT_SYMBOL(sport_set_rx_callback);
 794
 795int sport_set_tx_callback(struct sport_device *sport,
 796                void (*tx_callback)(void *), void *tx_data)
 797{
 798        BUG_ON(tx_callback == NULL);
 799        sport->tx_callback = tx_callback;
 800        sport->tx_data = tx_data;
 801
 802        return 0;
 803}
 804EXPORT_SYMBOL(sport_set_tx_callback);
 805
 806int sport_set_err_callback(struct sport_device *sport,
 807                void (*err_callback)(void *), void *err_data)
 808{
 809        BUG_ON(err_callback == NULL);
 810        sport->err_callback = err_callback;
 811        sport->err_data = err_data;
 812
 813        return 0;
 814}
 815EXPORT_SYMBOL(sport_set_err_callback);
 816
 817struct sport_device *sport_init(struct sport_param *param, unsigned wdsize,
 818                unsigned dummy_count, void *private_data)
 819{
 820        int ret;
 821        struct sport_device *sport;
 822        pr_debug("%s enter\n", __func__);
 823        BUG_ON(param == NULL);
 824        BUG_ON(wdsize == 0 || dummy_count == 0);
 825        sport = kmalloc(sizeof(struct sport_device), GFP_KERNEL);
 826        if (!sport) {
 827                pr_err("Failed to allocate for sport device\n");
 828                return NULL;
 829        }
 830
 831        memset(sport, 0, sizeof(struct sport_device));
 832        sport->dma_rx_chan = param->dma_rx_chan;
 833        sport->dma_tx_chan = param->dma_tx_chan;
 834        sport->err_irq = param->err_irq;
 835        sport->regs = param->regs;
 836        sport->private_data = private_data;
 837
 838        if (request_dma(sport->dma_rx_chan, "SPORT RX Data") == -EBUSY) {
 839                pr_err("Failed to request RX dma %d\n", \
 840                                sport->dma_rx_chan);
 841                goto __init_err1;
 842        }
 843        if (set_dma_callback(sport->dma_rx_chan, rx_handler, sport) != 0) {
 844                pr_err("Failed to request RX irq %d\n", \
 845                                sport->dma_rx_chan);
 846                goto __init_err2;
 847        }
 848
 849        if (request_dma(sport->dma_tx_chan, "SPORT TX Data") == -EBUSY) {
 850                pr_err("Failed to request TX dma %d\n", \
 851                                sport->dma_tx_chan);
 852                goto __init_err2;
 853        }
 854
 855        if (set_dma_callback(sport->dma_tx_chan, tx_handler, sport) != 0) {
 856                pr_err("Failed to request TX irq %d\n", \
 857                                sport->dma_tx_chan);
 858                goto __init_err3;
 859        }
 860
 861        if (request_irq(sport->err_irq, err_handler, IRQF_SHARED, "SPORT err",
 862                        sport) < 0) {
 863                pr_err("Failed to request err irq:%d\n", \
 864                                sport->err_irq);
 865                goto __init_err3;
 866        }
 867
 868        pr_err("dma rx:%d tx:%d, err irq:%d, regs:%p\n",
 869                        sport->dma_rx_chan, sport->dma_tx_chan,
 870                        sport->err_irq, sport->regs);
 871
 872        sport->wdsize = wdsize;
 873        sport->dummy_count = dummy_count;
 874
 875#if L1_DATA_A_LENGTH != 0
 876        sport->dummy_buf = l1_data_sram_alloc(dummy_count * 2);
 877#else
 878        sport->dummy_buf = kmalloc(dummy_count * 2, GFP_KERNEL);
 879#endif
 880        if (sport->dummy_buf == NULL) {
 881                pr_err("Failed to allocate dummy buffer\n");
 882                goto __error;
 883        }
 884
 885        memset(sport->dummy_buf, 0, dummy_count * 2);
 886        ret = sport_config_rx_dummy(sport);
 887        if (ret) {
 888                pr_err("Failed to config rx dummy ring\n");
 889                goto __error;
 890        }
 891        ret = sport_config_tx_dummy(sport);
 892        if (ret) {
 893                pr_err("Failed to config tx dummy ring\n");
 894                goto __error;
 895        }
 896
 897        return sport;
 898__error:
 899        free_irq(sport->err_irq, sport);
 900__init_err3:
 901        free_dma(sport->dma_tx_chan);
 902__init_err2:
 903        free_dma(sport->dma_rx_chan);
 904__init_err1:
 905        kfree(sport);
 906        return NULL;
 907}
 908EXPORT_SYMBOL(sport_init);
 909
 910void sport_done(struct sport_device *sport)
 911{
 912        if (sport == NULL)
 913                return;
 914
 915        sport_stop(sport);
 916        if (sport->dma_rx_desc)
 917                dma_free_coherent(NULL, sport->rx_desc_bytes,
 918                        sport->dma_rx_desc, 0);
 919        if (sport->dma_tx_desc)
 920                dma_free_coherent(NULL, sport->tx_desc_bytes,
 921                        sport->dma_tx_desc, 0);
 922
 923#if L1_DATA_A_LENGTH != 0
 924        l1_data_sram_free(sport->dummy_rx_desc);
 925        l1_data_sram_free(sport->dummy_tx_desc);
 926        l1_data_sram_free(sport->dummy_buf);
 927#else
 928        dma_free_coherent(NULL, 2*sizeof(struct dmasg),
 929                sport->dummy_rx_desc, 0);
 930        dma_free_coherent(NULL, 2*sizeof(struct dmasg),
 931                sport->dummy_tx_desc, 0);
 932        kfree(sport->dummy_buf);
 933#endif
 934        free_dma(sport->dma_rx_chan);
 935        free_dma(sport->dma_tx_chan);
 936        free_irq(sport->err_irq, sport);
 937
 938        kfree(sport);
 939                sport = NULL;
 940}
 941EXPORT_SYMBOL(sport_done);
 942/*
 943* It is only used to send several bytes when dma is not enabled
 944 * sport controller is configured but not enabled.
 945 * Multichannel cannot works with pio mode */
 946/* Used by ac97 to write and read codec register */
 947int sport_send_and_recv(struct sport_device *sport, u8 *out_data, \
 948                u8 *in_data, int len)
 949{
 950        unsigned short dma_config;
 951        unsigned short status;
 952        unsigned long flags;
 953        unsigned long wait = 0;
 954
 955        pr_debug("%s enter, out_data:%p, in_data:%p len:%d\n", \
 956                        __func__, out_data, in_data, len);
 957        pr_debug("tcr1:0x%04x, tcr2:0x%04x, tclkdiv:0x%04x, tfsdiv:0x%04x\n"
 958                        "mcmc1:0x%04x, mcmc2:0x%04x\n",
 959                        sport->regs->tcr1, sport->regs->tcr2,
 960                        sport->regs->tclkdiv, sport->regs->tfsdiv,
 961                        sport->regs->mcmc1, sport->regs->mcmc2);
 962        flush_dcache_range((unsigned)out_data, (unsigned)(out_data + len));
 963
 964        /* Enable tx dma */
 965        dma_config = (RESTART | WDSIZE_16 | DI_EN);
 966        set_dma_start_addr(sport->dma_tx_chan, (unsigned long)out_data);
 967        set_dma_x_count(sport->dma_tx_chan, len/2);
 968        set_dma_x_modify(sport->dma_tx_chan, 2);
 969        set_dma_config(sport->dma_tx_chan, dma_config);
 970        enable_dma(sport->dma_tx_chan);
 971
 972        if (in_data != NULL) {
 973                invalidate_dcache_range((unsigned)in_data, \
 974                                (unsigned)(in_data + len));
 975                /* Enable rx dma */
 976                dma_config = (RESTART | WDSIZE_16 | WNR | DI_EN);
 977                set_dma_start_addr(sport->dma_rx_chan, (unsigned long)in_data);
 978                set_dma_x_count(sport->dma_rx_chan, len/2);
 979                set_dma_x_modify(sport->dma_rx_chan, 2);
 980                set_dma_config(sport->dma_rx_chan, dma_config);
 981                enable_dma(sport->dma_rx_chan);
 982        }
 983
 984        local_irq_save(flags);
 985        sport->regs->tcr1 |= TSPEN;
 986        sport->regs->rcr1 |= RSPEN;
 987        SSYNC();
 988
 989        status = get_dma_curr_irqstat(sport->dma_tx_chan);
 990        while (status & DMA_RUN) {
 991                udelay(1);
 992                status = get_dma_curr_irqstat(sport->dma_tx_chan);
 993                pr_debug("DMA status:0x%04x\n", status);
 994                if (wait++ > 100)
 995                        goto __over;
 996        }
 997        status = sport->regs->stat;
 998        wait = 0;
 999
1000        while (!(status & TXHRE)) {
1001                pr_debug("sport status:0x%04x\n", status);
1002                udelay(1);
1003                status = *(unsigned short *)&sport->regs->stat;
1004                if (wait++ > 1000)
1005                        goto __over;
1006        }
1007        /* Wait for the last byte sent out */
1008        udelay(20);
1009        pr_debug("sport status:0x%04x\n", status);
1010
1011__over:
1012        sport->regs->tcr1 &= ~TSPEN;
1013        sport->regs->rcr1 &= ~RSPEN;
1014        SSYNC();
1015        disable_dma(sport->dma_tx_chan);
1016        /* Clear the status */
1017        clear_dma_irqstat(sport->dma_tx_chan);
1018        if (in_data != NULL) {
1019                disable_dma(sport->dma_rx_chan);
1020                clear_dma_irqstat(sport->dma_rx_chan);
1021        }
1022        SSYNC();
1023        local_irq_restore(flags);
1024
1025        return 0;
1026}
1027EXPORT_SYMBOL(sport_send_and_recv);
1028
1029MODULE_AUTHOR("Roy Huang");
1030MODULE_DESCRIPTION("SPORT driver for ADI Blackfin");
1031MODULE_LICENSE("GPL");
1032
1033
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