arch/blackfin/kernel/bfin_dma_5xx.c

   1 /*
   2  * File:         arch/blackfin/kernel/bfin_dma_5xx.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:
   7  * Description:  This file contains the simple DMA Implementation for Blackfin
   8  *
   9  * Modified:
  10  *               Copyright 2004-2006 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/errno.h>
  31 #include <linux/module.h>
  32 #include <linux/sched.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/kernel.h>
  35 #include <linux/param.h>
  36
  37 #include <asm/blackfin.h>
  38 #include <asm/dma.h>
  39 #include <asm/cacheflush.h>
  40
  41 /* Remove unused code not exported by symbol or internally called */
  42 #define REMOVE_DEAD_CODE
  43
  44 /**************************************************************************
  45  * Global Variables
  46 ***************************************************************************/
  47
  48 static struct dma_channel dma_ch[MAX_BLACKFIN_DMA_CHANNEL];
  49
  50 /*------------------------------------------------------------------------------
  51  *       Set the Buffer Clear bit in the Configuration register of specific DMA
  52  *       channel. This will stop the descriptor based DMA operation.
  53  *-----------------------------------------------------------------------------*/
  54 static void clear_dma_buffer(unsigned int channel)
  55 {
  56         dma_ch[channel].regs->cfg |= RESTART;
  57         SSYNC();
  58         dma_ch[channel].regs->cfg &= ~RESTART;
  59         SSYNC();
  60 }
  61
  62 static int __init blackfin_dma_init(void)
  63 {
  64         int i;
  65
  66         printk(KERN_INFO "Blackfin DMA Controller\n");
  67
  68         for (i = 0; i < MAX_BLACKFIN_DMA_CHANNEL; i++) {
  69                 dma_ch[i].chan_status = DMA_CHANNEL_FREE;
  70                 dma_ch[i].regs = dma_io_base_addr[i];
  71                 mutex_init(&(dma_ch[i].dmalock));
  72         }
  73         /* Mark MEMDMA Channel 0 as requested since we're using it internally */
  74         dma_ch[CH_MEM_STREAM0_DEST].chan_status = DMA_CHANNEL_REQUESTED;
  75         dma_ch[CH_MEM_STREAM0_SRC].chan_status = DMA_CHANNEL_REQUESTED;
  76
  77 #if defined(CONFIG_DEB_DMA_URGENT)
  78         bfin_write_EBIU_DDRQUE(bfin_read_EBIU_DDRQUE()
  79                          | DEB1_URGENT | DEB2_URGENT | DEB3_URGENT);
  80 #endif
  81         return 0;
  82 }
  83
  84 arch_initcall(blackfin_dma_init);
  85
  86 /*------------------------------------------------------------------------------
  87  *      Request the specific DMA channel from the system.
  88  *-----------------------------------------------------------------------------*/
  89 int request_dma(unsigned int channel, char *device_id)
  90 {
  91
  92         pr_debug("request_dma() : BEGIN \n");
  93
  94 #if defined(CONFIG_BF561) && ANOMALY_05000182
  95         if (channel >= CH_IMEM_STREAM0_DEST && channel <= CH_IMEM_STREAM1_DEST) {
  96                 if (get_cclk() > 500000000) {
  97                         printk(KERN_WARNING
  98                                "Request IMDMA failed due to ANOMALY 05000182\n");
  99                         return -EFAULT;
 100                 }
 101         }
 102 #endif
 103
 104         mutex_lock(&(dma_ch[channel].dmalock));
 105
 106         if ((dma_ch[channel].chan_status == DMA_CHANNEL_REQUESTED)
 107             || (dma_ch[channel].chan_status == DMA_CHANNEL_ENABLED)) {
 108                 mutex_unlock(&(dma_ch[channel].dmalock));
 109                 pr_debug("DMA CHANNEL IN USE  \n");
 110                 return -EBUSY;
 111         } else {
 112                 dma_ch[channel].chan_status = DMA_CHANNEL_REQUESTED;
 113                 pr_debug("DMA CHANNEL IS ALLOCATED  \n");
 114         }
 115
 116         mutex_unlock(&(dma_ch[channel].dmalock));
 117
 118 #ifdef CONFIG_BF54x
 119         if (channel >= CH_UART2_RX && channel <= CH_UART3_TX) {
 120                 if (strncmp(device_id, "BFIN_UART", 9) == 0) {
 121                         dma_ch[channel].regs->peripheral_map &= 0x0FFF;
 122                         dma_ch[channel].regs->peripheral_map |=
 123                                 ((channel - CH_UART2_RX + 0xC)<<12);
 124                 } else {
 125                         dma_ch[channel].regs->peripheral_map &= 0x0FFF;
 126                         dma_ch[channel].regs->peripheral_map |=
 127                                 ((channel - CH_UART2_RX + 0x6)<<12);
 128                 }
 129         }
 130 #endif
 131
 132         dma_ch[channel].device_id = device_id;
 133         dma_ch[channel].irq_callback = NULL;
 134
 135         /* This is to be enabled by putting a restriction -
 136          * you have to request DMA, before doing any operations on
 137          * descriptor/channel
 138          */
 139         pr_debug("request_dma() : END  \n");
 140         return channel;
 141 }
 142 EXPORT_SYMBOL(request_dma);
 143
 144 int set_dma_callback(unsigned int channel, dma_interrupt_t callback, void *data)
 145 {
 146         int ret_irq = 0;
 147
 148         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 149                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 150
 151         if (callback != NULL) {
 152                 int ret_val;
 153                 ret_irq = channel2irq(channel);
 154
 155                 dma_ch[channel].data = data;
 156
 157                 ret_val =
 158                     request_irq(ret_irq, (void *)callback, IRQF_DISABLED,
 159                                 dma_ch[channel].device_id, data);
 160                 if (ret_val) {
 161                         printk(KERN_NOTICE
 162                                "Request irq in DMA engine failed.\n");
 163                         return -EPERM;
 164                 }
 165                 dma_ch[channel].irq_callback = callback;
 166         }
 167         return 0;
 168 }
 169 EXPORT_SYMBOL(set_dma_callback);
 170
 171 void free_dma(unsigned int channel)
 172 {
 173         int ret_irq;
 174
 175         pr_debug("freedma() : BEGIN \n");
 176         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 177                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 178
 179         /* Halt the DMA */
 180         disable_dma(channel);
 181         clear_dma_buffer(channel);
 182
 183         if (dma_ch[channel].irq_callback != NULL) {
 184                 ret_irq = channel2irq(channel);
 185                 free_irq(ret_irq, dma_ch[channel].data);
 186         }
 187
 188         /* Clear the DMA Variable in the Channel */
 189         mutex_lock(&(dma_ch[channel].dmalock));
 190         dma_ch[channel].chan_status = DMA_CHANNEL_FREE;
 191         mutex_unlock(&(dma_ch[channel].dmalock));
 192
 193         pr_debug("freedma() : END \n");
 194 }
 195 EXPORT_SYMBOL(free_dma);
 196
 197 void dma_enable_irq(unsigned int channel)
 198 {
 199         int ret_irq;
 200
 201         pr_debug("dma_enable_irq() : BEGIN \n");
 202         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 203                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 204
 205         ret_irq = channel2irq(channel);
 206         enable_irq(ret_irq);
 207 }
 208 EXPORT_SYMBOL(dma_enable_irq);
 209
 210 void dma_disable_irq(unsigned int channel)
 211 {
 212         int ret_irq;
 213
 214         pr_debug("dma_disable_irq() : BEGIN \n");
 215         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 216                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 217
 218         ret_irq = channel2irq(channel);
 219         disable_irq(ret_irq);
 220 }
 221 EXPORT_SYMBOL(dma_disable_irq);
 222
 223 int dma_channel_active(unsigned int channel)
 224 {
 225         if (dma_ch[channel].chan_status == DMA_CHANNEL_FREE) {
 226                 return 0;
 227         } else {
 228                 return 1;
 229         }
 230 }
 231 EXPORT_SYMBOL(dma_channel_active);
 232
 233 /*------------------------------------------------------------------------------
 234 *       stop the specific DMA channel.
 235 *-----------------------------------------------------------------------------*/
 236 void disable_dma(unsigned int channel)
 237 {
 238         pr_debug("stop_dma() : BEGIN \n");
 239
 240         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 241                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 242
 243         dma_ch[channel].regs->cfg &= ~DMAEN;    /* Clean the enable bit */
 244         SSYNC();
 245         dma_ch[channel].chan_status = DMA_CHANNEL_REQUESTED;
 246         /* Needs to be enabled Later */
 247         pr_debug("stop_dma() : END \n");
 248         return;
 249 }
 250 EXPORT_SYMBOL(disable_dma);
 251
 252 void enable_dma(unsigned int channel)
 253 {
 254         pr_debug("enable_dma() : BEGIN \n");
 255
 256         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 257                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 258
 259         dma_ch[channel].chan_status = DMA_CHANNEL_ENABLED;
 260         dma_ch[channel].regs->curr_x_count = 0;
 261         dma_ch[channel].regs->curr_y_count = 0;
 262
 263         dma_ch[channel].regs->cfg |= DMAEN;     /* Set the enable bit */
 264         SSYNC();
 265         pr_debug("enable_dma() : END \n");
 266         return;
 267 }
 268 EXPORT_SYMBOL(enable_dma);
 269
 270 /*------------------------------------------------------------------------------
 271 *               Set the Start Address register for the specific DMA channel
 272 *               This function can be used for register based DMA,
 273 *               to setup the start address
 274 *               addr:           Starting address of the DMA Data to be transferred.
 275 *-----------------------------------------------------------------------------*/
 276 void set_dma_start_addr(unsigned int channel, unsigned long addr)
 277 {
 278         pr_debug("set_dma_start_addr() : BEGIN \n");
 279
 280         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 281                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 282
 283         dma_ch[channel].regs->start_addr = addr;
 284         SSYNC();
 285         pr_debug("set_dma_start_addr() : END\n");
 286 }
 287 EXPORT_SYMBOL(set_dma_start_addr);
 288
 289 void set_dma_next_desc_addr(unsigned int channel, unsigned long addr)
 290 {
 291         pr_debug("set_dma_next_desc_addr() : BEGIN \n");
 292
 293         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 294                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 295
 296         dma_ch[channel].regs->next_desc_ptr = addr;
 297         SSYNC();
 298         pr_debug("set_dma_next_desc_addr() : END\n");
 299 }
 300 EXPORT_SYMBOL(set_dma_next_desc_addr);
 301
 302 void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr)
 303 {
 304         pr_debug("set_dma_curr_desc_addr() : BEGIN \n");
 305
 306         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 307                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 308
 309         dma_ch[channel].regs->curr_desc_ptr = addr;
 310         SSYNC();
 311         pr_debug("set_dma_curr_desc_addr() : END\n");
 312 }
 313 EXPORT_SYMBOL(set_dma_curr_desc_addr);
 314
 315 void set_dma_x_count(unsigned int channel, unsigned short x_count)
 316 {
 317         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 318                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 319
 320         dma_ch[channel].regs->x_count = x_count;
 321         SSYNC();
 322 }
 323 EXPORT_SYMBOL(set_dma_x_count);
 324
 325 void set_dma_y_count(unsigned int channel, unsigned short y_count)
 326 {
 327         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 328                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 329
 330         dma_ch[channel].regs->y_count = y_count;
 331         SSYNC();
 332 }
 333 EXPORT_SYMBOL(set_dma_y_count);
 334
 335 void set_dma_x_modify(unsigned int channel, short x_modify)
 336 {
 337         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 338                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 339
 340         dma_ch[channel].regs->x_modify = x_modify;
 341         SSYNC();
 342 }
 343 EXPORT_SYMBOL(set_dma_x_modify);
 344
 345 void set_dma_y_modify(unsigned int channel, short y_modify)
 346 {
 347         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 348                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 349
 350         dma_ch[channel].regs->y_modify = y_modify;
 351         SSYNC();
 352 }
 353 EXPORT_SYMBOL(set_dma_y_modify);
 354
 355 void set_dma_config(unsigned int channel, unsigned short config)
 356 {
 357         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 358                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 359
 360         dma_ch[channel].regs->cfg = config;
 361         SSYNC();
 362 }
 363 EXPORT_SYMBOL(set_dma_config);
 364
 365 unsigned short
 366 set_bfin_dma_config(char direction, char flow_mode,
 367                     char intr_mode, char dma_mode, char width, char syncmode)
 368 {
 369         unsigned short config;
 370
 371         config =
 372             ((direction << 1) | (width << 2) | (dma_mode << 4) |
 373              (intr_mode << 6) | (flow_mode << 12) | (syncmode << 5));
 374         return config;
 375 }
 376 EXPORT_SYMBOL(set_bfin_dma_config);
 377
 378 void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg)
 379 {
 380         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 381                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 382
 383         dma_ch[channel].regs->cfg |= ((nr_sg & 0x0F) << 8);
 384
 385         dma_ch[channel].regs->next_desc_ptr = (unsigned int)sg;
 386
 387         SSYNC();
 388 }
 389 EXPORT_SYMBOL(set_dma_sg);
 390
 391 void set_dma_curr_addr(unsigned int channel, unsigned long addr)
 392 {
 393         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 394                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 395
 396         dma_ch[channel].regs->curr_addr_ptr = addr;
 397         SSYNC();
 398 }
 399 EXPORT_SYMBOL(set_dma_curr_addr);
 400
 401 /*------------------------------------------------------------------------------
 402  *      Get the DMA status of a specific DMA channel from the system.
 403  *-----------------------------------------------------------------------------*/
 404 unsigned short get_dma_curr_irqstat(unsigned int channel)
 405 {
 406         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 407                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 408
 409         return dma_ch[channel].regs->irq_status;
 410 }
 411 EXPORT_SYMBOL(get_dma_curr_irqstat);
 412
 413 /*------------------------------------------------------------------------------
 414  *      Clear the DMA_DONE bit in DMA status. Stop the DMA completion interrupt.
 415  *-----------------------------------------------------------------------------*/
 416 void clear_dma_irqstat(unsigned int channel)
 417 {
 418         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 419                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 420         dma_ch[channel].regs->irq_status |= 3;
 421 }
 422 EXPORT_SYMBOL(clear_dma_irqstat);
 423
 424 /*------------------------------------------------------------------------------
 425  *      Get current DMA xcount of a specific DMA channel from the system.
 426  *-----------------------------------------------------------------------------*/
 427 unsigned short get_dma_curr_xcount(unsigned int channel)
 428 {
 429         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 430                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 431
 432         return dma_ch[channel].regs->curr_x_count;
 433 }
 434 EXPORT_SYMBOL(get_dma_curr_xcount);
 435
 436 /*------------------------------------------------------------------------------
 437  *      Get current DMA ycount of a specific DMA channel from the system.
 438  *-----------------------------------------------------------------------------*/
 439 unsigned short get_dma_curr_ycount(unsigned int channel)
 440 {
 441         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 442                && channel < MAX_BLACKFIN_DMA_CHANNEL));
 443
 444         return dma_ch[channel].regs->curr_y_count;
 445 }
 446 EXPORT_SYMBOL(get_dma_curr_ycount);
 447
 448 unsigned long get_dma_next_desc_ptr(unsigned int channel)
 449 {
 450         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 451               && channel < MAX_BLACKFIN_DMA_CHANNEL));
 452
 453         return dma_ch[channel].regs->next_desc_ptr;
 454 }
 455 EXPORT_SYMBOL(get_dma_next_desc_ptr);
 456
 457 unsigned long get_dma_curr_desc_ptr(unsigned int channel)
 458 {
 459         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 460               && channel < MAX_BLACKFIN_DMA_CHANNEL));
 461
 462         return dma_ch[channel].regs->curr_desc_ptr;
 463 }
 464 EXPORT_SYMBOL(get_dma_curr_desc_ptr);
 465
 466 unsigned long get_dma_curr_addr(unsigned int channel)
 467 {
 468         BUG_ON(!(dma_ch[channel].chan_status != DMA_CHANNEL_FREE
 469               && channel < MAX_BLACKFIN_DMA_CHANNEL));
 470
 471         return dma_ch[channel].regs->curr_addr_ptr;
 472 }
 473 EXPORT_SYMBOL(get_dma_curr_addr);
 474
 475 #ifdef CONFIG_PM
 476 int blackfin_dma_suspend(void)
 477 {
 478         int i;
 479
 480         for (i = 0; i < MAX_BLACKFIN_DMA_CHANNEL; i++) {
 481                 if (dma_ch[i].chan_status == DMA_CHANNEL_ENABLED) {
 482                         printk(KERN_ERR "DMA Channel %d failed to suspend\n", i);
 483                         return -EBUSY;
 484                 }
 485
 486                 dma_ch[i].saved_peripheral_map = dma_ch[i].regs->peripheral_map;
 487         }
 488
 489         return 0;
 490 }
 491
 492 void blackfin_dma_resume(void)
 493 {
 494         int i;
 495
 496         for (i = 0; i < MAX_BLACKFIN_DMA_CHANNEL; i++)
 497                 dma_ch[i].regs->peripheral_map = dma_ch[i].saved_peripheral_map;
 498 }
 499 #endif
 500
 501 static void *__dma_memcpy(void *dest, const void *src, size_t size)
 502 {
 503         int direction;  /* 1 - address decrease, 0 - address increase */
 504         int flag_align; /* 1 - address aligned,  0 - address unaligned */
 505         int flag_2D;    /* 1 - 2D DMA needed,    0 - 1D DMA needed */
 506         unsigned long flags;
 507
 508         if (size <= 0)
 509                 return NULL;
 510
 511         local_irq_save(flags);
 512
 513         if ((unsigned long)src < memory_end)
 514                 blackfin_dcache_flush_range((unsigned int)src,
 515                                             (unsigned int)(src + size));
 516
 517         if ((unsigned long)dest < memory_end)
 518                 blackfin_dcache_invalidate_range((unsigned int)dest,
 519                                                  (unsigned int)(dest + size));
 520
 521         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 522
 523         if ((unsigned long)src < (unsigned long)dest)
 524                 direction = 1;
 525         else
 526                 direction = 0;
 527
 528         if ((((unsigned long)dest % 2) == 0) && (((unsigned long)src % 2) == 0)
 529             && ((size % 2) == 0))
 530                 flag_align = 1;
 531         else
 532                 flag_align = 0;
 533
 534         if (size > 0x10000)     /* size > 64K */
 535                 flag_2D = 1;
 536         else
 537                 flag_2D = 0;
 538
 539         /* Setup destination and source start address */
 540         if (direction) {
 541                 if (flag_align) {
 542                         bfin_write_MDMA_D0_START_ADDR(dest + size - 2);
 543                         bfin_write_MDMA_S0_START_ADDR(src + size - 2);
 544                 } else {
 545                         bfin_write_MDMA_D0_START_ADDR(dest + size - 1);
 546                         bfin_write_MDMA_S0_START_ADDR(src + size - 1);
 547                 }
 548         } else {
 549                 bfin_write_MDMA_D0_START_ADDR(dest);
 550                 bfin_write_MDMA_S0_START_ADDR(src);
 551         }
 552
 553         /* Setup destination and source xcount */
 554         if (flag_2D) {
 555                 if (flag_align) {
 556                         bfin_write_MDMA_D0_X_COUNT(1024 / 2);
 557                         bfin_write_MDMA_S0_X_COUNT(1024 / 2);
 558                 } else {
 559                         bfin_write_MDMA_D0_X_COUNT(1024);
 560                         bfin_write_MDMA_S0_X_COUNT(1024);
 561                 }
 562                 bfin_write_MDMA_D0_Y_COUNT(size >> 10);
 563                 bfin_write_MDMA_S0_Y_COUNT(size >> 10);
 564         } else {
 565                 if (flag_align) {
 566                         bfin_write_MDMA_D0_X_COUNT(size / 2);
 567                         bfin_write_MDMA_S0_X_COUNT(size / 2);
 568                 } else {
 569                         bfin_write_MDMA_D0_X_COUNT(size);
 570                         bfin_write_MDMA_S0_X_COUNT(size);
 571                 }
 572         }
 573
 574         /* Setup destination and source xmodify and ymodify */
 575         if (direction) {
 576                 if (flag_align) {
 577                         bfin_write_MDMA_D0_X_MODIFY(-2);
 578                         bfin_write_MDMA_S0_X_MODIFY(-2);
 579                         if (flag_2D) {
 580                                 bfin_write_MDMA_D0_Y_MODIFY(-2);
 581                                 bfin_write_MDMA_S0_Y_MODIFY(-2);
 582                         }
 583                 } else {
 584                         bfin_write_MDMA_D0_X_MODIFY(-1);
 585                         bfin_write_MDMA_S0_X_MODIFY(-1);
 586                         if (flag_2D) {
 587                                 bfin_write_MDMA_D0_Y_MODIFY(-1);
 588                                 bfin_write_MDMA_S0_Y_MODIFY(-1);
 589                         }
 590                 }
 591         } else {
 592                 if (flag_align) {
 593                         bfin_write_MDMA_D0_X_MODIFY(2);
 594                         bfin_write_MDMA_S0_X_MODIFY(2);
 595                         if (flag_2D) {
 596                                 bfin_write_MDMA_D0_Y_MODIFY(2);
 597                                 bfin_write_MDMA_S0_Y_MODIFY(2);
 598                         }
 599                 } else {
 600                         bfin_write_MDMA_D0_X_MODIFY(1);
 601                         bfin_write_MDMA_S0_X_MODIFY(1);
 602                         if (flag_2D) {
 603                                 bfin_write_MDMA_D0_Y_MODIFY(1);
 604                                 bfin_write_MDMA_S0_Y_MODIFY(1);
 605                         }
 606                 }
 607         }
 608
 609         /* Enable source DMA */
 610         if (flag_2D) {
 611                 if (flag_align) {
 612                         bfin_write_MDMA_S0_CONFIG(DMAEN | DMA2D | WDSIZE_16);
 613                         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | DMA2D | WDSIZE_16);
 614                 } else {
 615                         bfin_write_MDMA_S0_CONFIG(DMAEN | DMA2D);
 616                         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | DMA2D);
 617                 }
 618         } else {
 619                 if (flag_align) {
 620                         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
 621                         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
 622                 } else {
 623                         bfin_write_MDMA_S0_CONFIG(DMAEN);
 624                         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN);
 625                 }
 626         }
 627
 628         SSYNC();
 629
 630         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
 631                 ;
 632
 633         bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() |
 634                                       (DMA_DONE | DMA_ERR));
 635
 636         bfin_write_MDMA_S0_CONFIG(0);
 637         bfin_write_MDMA_D0_CONFIG(0);
 638
 639         local_irq_restore(flags);
 640
 641         return dest;
 642 }
 643
 644 void *dma_memcpy(void *dest, const void *src, size_t size)
 645 {
 646         size_t bulk;
 647         size_t rest;
 648         void * addr;
 649
 650         bulk = (size >> 16) << 16;
 651         rest = size - bulk;
 652         if (bulk)
 653                 __dma_memcpy(dest, src, bulk);
 654         addr = __dma_memcpy(dest+bulk, src+bulk, rest);
 655         return addr;
 656 }
 657 EXPORT_SYMBOL(dma_memcpy);
 658
 659 void *safe_dma_memcpy(void *dest, const void *src, size_t size)
 660 {
 661         void *addr;
 662         addr = dma_memcpy(dest, src, size);
 663         return addr;
 664 }
 665 EXPORT_SYMBOL(safe_dma_memcpy);
 666
 667 void dma_outsb(unsigned long addr, const void *buf, unsigned short len)
 668 {
 669         unsigned long flags;
 670
 671         local_irq_save(flags);
 672
 673         blackfin_dcache_flush_range((unsigned int)buf,
 674                          (unsigned int)(buf) + len);
 675
 676         bfin_write_MDMA_D0_START_ADDR(addr);
 677         bfin_write_MDMA_D0_X_COUNT(len);
 678         bfin_write_MDMA_D0_X_MODIFY(0);
 679         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 680
 681         bfin_write_MDMA_S0_START_ADDR(buf);
 682         bfin_write_MDMA_S0_X_COUNT(len);
 683         bfin_write_MDMA_S0_X_MODIFY(1);
 684         bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 685
 686         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_8);
 687         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_8);
 688
 689         SSYNC();
 690
 691         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
 692
 693         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 694
 695         bfin_write_MDMA_S0_CONFIG(0);
 696         bfin_write_MDMA_D0_CONFIG(0);
 697         local_irq_restore(flags);
 698
 699 }
 700 EXPORT_SYMBOL(dma_outsb);
 701
 702
 703 void dma_insb(unsigned long addr, void *buf, unsigned short len)
 704 {
 705         unsigned long flags;
 706
 707         blackfin_dcache_invalidate_range((unsigned int)buf,
 708                          (unsigned int)(buf) + len);
 709
 710         local_irq_save(flags);
 711         bfin_write_MDMA_D0_START_ADDR(buf);
 712         bfin_write_MDMA_D0_X_COUNT(len);
 713         bfin_write_MDMA_D0_X_MODIFY(1);
 714         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 715
 716         bfin_write_MDMA_S0_START_ADDR(addr);
 717         bfin_write_MDMA_S0_X_COUNT(len);
 718         bfin_write_MDMA_S0_X_MODIFY(0);
 719         bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 720
 721         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_8);
 722         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_8);
 723
 724         SSYNC();
 725
 726         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
 727
 728         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 729
 730         bfin_write_MDMA_S0_CONFIG(0);
 731         bfin_write_MDMA_D0_CONFIG(0);
 732         local_irq_restore(flags);
 733
 734 }
 735 EXPORT_SYMBOL(dma_insb);
 736
 737 void dma_outsw(unsigned long addr, const void  *buf, unsigned short len)
 738 {
 739         unsigned long flags;
 740
 741         local_irq_save(flags);
 742
 743         blackfin_dcache_flush_range((unsigned int)buf,
 744                          (unsigned int)(buf) + len * sizeof(short));
 745
 746         bfin_write_MDMA_D0_START_ADDR(addr);
 747         bfin_write_MDMA_D0_X_COUNT(len);
 748         bfin_write_MDMA_D0_X_MODIFY(0);
 749         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 750
 751         bfin_write_MDMA_S0_START_ADDR(buf);
 752         bfin_write_MDMA_S0_X_COUNT(len);
 753         bfin_write_MDMA_S0_X_MODIFY(2);
 754         bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 755
 756         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
 757         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
 758
 759         SSYNC();
 760
 761         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
 762
 763         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 764
 765         bfin_write_MDMA_S0_CONFIG(0);
 766         bfin_write_MDMA_D0_CONFIG(0);
 767         local_irq_restore(flags);
 768
 769 }
 770 EXPORT_SYMBOL(dma_outsw);
 771
 772 void dma_insw(unsigned long addr, void *buf, unsigned short len)
 773 {
 774         unsigned long flags;
 775
 776         blackfin_dcache_invalidate_range((unsigned int)buf,
 777                          (unsigned int)(buf) + len * sizeof(short));
 778
 779         local_irq_save(flags);
 780
 781         bfin_write_MDMA_D0_START_ADDR(buf);
 782         bfin_write_MDMA_D0_X_COUNT(len);
 783         bfin_write_MDMA_D0_X_MODIFY(2);
 784         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 785
 786         bfin_write_MDMA_S0_START_ADDR(addr);
 787         bfin_write_MDMA_S0_X_COUNT(len);
 788         bfin_write_MDMA_S0_X_MODIFY(0);
 789         bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 790
 791         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
 792         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
 793
 794         SSYNC();
 795
 796         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
 797
 798         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 799
 800         bfin_write_MDMA_S0_CONFIG(0);
 801         bfin_write_MDMA_D0_CONFIG(0);
 802         local_irq_restore(flags);
 803
 804 }
 805 EXPORT_SYMBOL(dma_insw);
 806
 807 void dma_outsl(unsigned long addr, const void *buf, unsigned short len)
 808 {
 809         unsigned long flags;
 810
 811         local_irq_save(flags);
 812
 813         blackfin_dcache_flush_range((unsigned int)buf,
 814                          (unsigned int)(buf) + len * sizeof(long));
 815
 816         bfin_write_MDMA_D0_START_ADDR(addr);
 817         bfin_write_MDMA_D0_X_COUNT(len);
 818         bfin_write_MDMA_D0_X_MODIFY(0);
 819         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 820
 821         bfin_write_MDMA_S0_START_ADDR(buf);
 822         bfin_write_MDMA_S0_X_COUNT(len);
 823         bfin_write_MDMA_S0_X_MODIFY(4);
 824         bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 825
 826         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_32);
 827         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_32);
 828
 829         SSYNC();
 830
 831         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
 832
 833         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 834
 835         bfin_write_MDMA_S0_CONFIG(0);
 836         bfin_write_MDMA_D0_CONFIG(0);
 837         local_irq_restore(flags);
 838
 839 }
 840 EXPORT_SYMBOL(dma_outsl);
 841
 842 void dma_insl(unsigned long addr, void *buf, unsigned short len)
 843 {
 844         unsigned long flags;
 845
 846         blackfin_dcache_invalidate_range((unsigned int)buf,
 847                          (unsigned int)(buf) + len * sizeof(long));
 848
 849         local_irq_save(flags);
 850
 851         bfin_write_MDMA_D0_START_ADDR(buf);
 852         bfin_write_MDMA_D0_X_COUNT(len);
 853         bfin_write_MDMA_D0_X_MODIFY(4);
 854         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 855
 856         bfin_write_MDMA_S0_START_ADDR(addr);
 857         bfin_write_MDMA_S0_X_COUNT(len);
 858         bfin_write_MDMA_S0_X_MODIFY(0);
 859         bfin_write_MDMA_S0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 860
 861         bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_32);
 862         bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_32);
 863
 864         SSYNC();
 865
 866         while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
 867
 868         bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
 869
 870         bfin_write_MDMA_S0_CONFIG(0);
 871         bfin_write_MDMA_D0_CONFIG(0);
 872         local_irq_restore(flags);
 873
 874 }
 875 EXPORT_SYMBOL(dma_insl);