git.oblomov.eu Git - linux-2.6/blob - sound/soc/blackfin/bf5xx-sport.c

   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
  45 struct sport_device *sport_handle;
  46 EXPORT_SYMBOL(sport_handle);
  47 /* note: multichannel is in units of 8 channels,
  48  * tdm_count is # channels NOT / 8 ! */
  49 int 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 }
  92 EXPORT_SYMBOL(sport_set_multichannel);
  93
  94 int 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 }
 109 EXPORT_SYMBOL(sport_config_rx);
 110
 111 int 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 }
 126 EXPORT_SYMBOL(sport_config_tx);
 127
 128 static 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
 156 static 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
 167 static 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
 178 static 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
 210 static 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
 231 static 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
 252 int 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 }
 281 EXPORT_SYMBOL(sport_rx_start);
 282
 283 int 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 }
 303 EXPORT_SYMBOL(sport_rx_stop);
 304
 305 static 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
 337 int 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 }
 367 EXPORT_SYMBOL(sport_tx_start);
 368
 369 int 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 }
 387 EXPORT_SYMBOL(sport_tx_stop);
 388
 389 static 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
 402 int 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 }
 465 EXPORT_SYMBOL(sport_config_rx_dma);
 466
 467 int 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 }
 529 EXPORT_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 */
 533 static 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
 567 static 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
 603 unsigned 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 }
 609 EXPORT_SYMBOL(sport_curr_offset_rx);
 610
 611 unsigned 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 }
 617 EXPORT_SYMBOL(sport_curr_offset_tx);
 618
 619 void 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 }
 628 EXPORT_SYMBOL(sport_incfrag);
 629
 630 void 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 }
 639 EXPORT_SYMBOL(sport_decfrag);
 640
 641 static 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
 678 int  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
 704 static 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
 722 static 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
 740 static 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
 784 int 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 }
 793 EXPORT_SYMBOL(sport_set_rx_callback);
 794
 795 int 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 }
 804 EXPORT_SYMBOL(sport_set_tx_callback);
 805
 806 int 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 }
 815 EXPORT_SYMBOL(sport_set_err_callback);
 816
 817 struct 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 }
 908 EXPORT_SYMBOL(sport_init);
 909
 910 void 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 }
 941 EXPORT_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 */
 947 int 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 }
1027 EXPORT_SYMBOL(sport_send_and_recv);
1028
1029 MODULE_AUTHOR("Roy Huang");
1030 MODULE_DESCRIPTION("SPORT driver for ADI Blackfin");
1031 MODULE_LICENSE("GPL");
1032