arch/arm/plat-omap/dma.c

   1 /*
   2  * linux/arch/arm/plat-omap/dma.c
   3  *
   4  * Copyright (C) 2003 - 2008 Nokia Corporation
   5  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
   6  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
   7  * Graphics DMA and LCD DMA graphics tranformations
   8  * by Imre Deak <imre.deak@nokia.com>
   9  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
  10  * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
  11  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
  12  *
  13  * Copyright (C) 2009 Texas Instruments
  14  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  15  *
  16  * Support functions for the OMAP internal DMA channels.
  17  *
  18  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
  19  * Converted DMA library into DMA platform driver.
  20  *      - G, Manjunath Kondaiah <manjugk@ti.com>
  21  *
  22  * This program is free software; you can redistribute it and/or modify
  23  * it under the terms of the GNU General Public License version 2 as
  24  * published by the Free Software Foundation.
  25  *
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/sched.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/errno.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/irq.h>
  35 #include <linux/io.h>
  36 #include <linux/slab.h>
  37 #include <linux/delay.h>
  38
  39 #include <linux/omap-dma.h>
  40
  41 /*
  42  * MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
  43  * channels that an instance of the SDMA IP block can support.  Used
  44  * to size arrays.  (The actual maximum on a particular SoC may be less
  45  * than this -- for example, OMAP1 SDMA instances only support 17 logical
  46  * DMA channels.)
  47  */
  48 #define MAX_LOGICAL_DMA_CH_COUNT                32
  49
  50 #undef DEBUG
  51
  52 #ifndef CONFIG_ARCH_OMAP1
  53 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
  54         DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
  55 };
  56
  57 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
  58 #endif
  59
  60 #define OMAP_DMA_ACTIVE                 0x01
  61 #define OMAP2_DMA_CSR_CLEAR_MASK        0xffffffff
  62
  63 #define OMAP_FUNC_MUX_ARM_BASE          (0xfffe1000 + 0xec)
  64
  65 static struct omap_system_dma_plat_info *p;
  66 static struct omap_dma_dev_attr *d;
  67
  68 static int enable_1510_mode;
  69 static u32 errata;
  70
  71 static struct omap_dma_global_context_registers {
  72         u32 dma_irqenable_l0;
  73         u32 dma_ocp_sysconfig;
  74         u32 dma_gcr;
  75 } omap_dma_global_context;
  76
  77 struct dma_link_info {
  78         int *linked_dmach_q;
  79         int no_of_lchs_linked;
  80
  81         int q_count;
  82         int q_tail;
  83         int q_head;
  84
  85         int chain_state;
  86         int chain_mode;
  87
  88 };
  89
  90 static struct dma_link_info *dma_linked_lch;
  91
  92 #ifndef CONFIG_ARCH_OMAP1
  93
  94 /* Chain handling macros */
  95 #define OMAP_DMA_CHAIN_QINIT(chain_id)                                  \
  96         do {                                                            \
  97                 dma_linked_lch[chain_id].q_head =                       \
  98                 dma_linked_lch[chain_id].q_tail =                       \
  99                 dma_linked_lch[chain_id].q_count = 0;                   \
 100         } while (0)
 101 #define OMAP_DMA_CHAIN_QFULL(chain_id)                                  \
 102                 (dma_linked_lch[chain_id].no_of_lchs_linked ==          \
 103                 dma_linked_lch[chain_id].q_count)
 104 #define OMAP_DMA_CHAIN_QLAST(chain_id)                                  \
 105         do {                                                            \
 106                 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==      \
 107                 dma_linked_lch[chain_id].q_count)                       \
 108         } while (0)
 109 #define OMAP_DMA_CHAIN_QEMPTY(chain_id)                                 \
 110                 (0 == dma_linked_lch[chain_id].q_count)
 111 #define __OMAP_DMA_CHAIN_INCQ(end)                                      \
 112         ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
 113 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id)                               \
 114         do {                                                            \
 115                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
 116                 dma_linked_lch[chain_id].q_count--;                     \
 117         } while (0)
 118
 119 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id)                               \
 120         do {                                                            \
 121                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
 122                 dma_linked_lch[chain_id].q_count++; \
 123         } while (0)
 124 #endif
 125
 126 static int dma_lch_count;
 127 static int dma_chan_count;
 128 static int omap_dma_reserve_channels;
 129
 130 static spinlock_t dma_chan_lock;
 131 static struct omap_dma_lch *dma_chan;
 132
 133 static inline void disable_lnk(int lch);
 134 static void omap_disable_channel_irq(int lch);
 135 static inline void omap_enable_channel_irq(int lch);
 136
 137 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 138                                                 __func__);
 139
 140 #ifdef CONFIG_ARCH_OMAP15XX
 141 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 142 static int omap_dma_in_1510_mode(void)
 143 {
 144         return enable_1510_mode;
 145 }
 146 #else
 147 #define omap_dma_in_1510_mode()         0
 148 #endif
 149
 150 #ifdef CONFIG_ARCH_OMAP1
 151 static inline int get_gdma_dev(int req)
 152 {
 153         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 154         int shift = ((req - 1) % 5) * 6;
 155
 156         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
 157 }
 158
 159 static inline void set_gdma_dev(int req, int dev)
 160 {
 161         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 162         int shift = ((req - 1) % 5) * 6;
 163         u32 l;
 164
 165         l = omap_readl(reg);
 166         l &= ~(0x3f << shift);
 167         l |= (dev - 1) << shift;
 168         omap_writel(l, reg);
 169 }
 170 #else
 171 #define set_gdma_dev(req, dev)  do {} while (0)
 172 #define omap_readl(reg)         0
 173 #define omap_writel(val, reg)   do {} while (0)
 174 #endif
 175
 176 #ifdef CONFIG_ARCH_OMAP1
 177 void omap_set_dma_priority(int lch, int dst_port, int priority)
 178 {
 179         unsigned long reg;
 180         u32 l;
 181
 182         if (dma_omap1()) {
 183                 switch (dst_port) {
 184                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 185                         reg = OMAP_TC_OCPT1_PRIOR;
 186                         break;
 187                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 188                         reg = OMAP_TC_OCPT2_PRIOR;
 189                         break;
 190                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 191                         reg = OMAP_TC_EMIFF_PRIOR;
 192                         break;
 193                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 194                         reg = OMAP_TC_EMIFS_PRIOR;
 195                         break;
 196                 default:
 197                         BUG();
 198                         return;
 199                 }
 200                 l = omap_readl(reg);
 201                 l &= ~(0xf << 8);
 202                 l |= (priority & 0xf) << 8;
 203                 omap_writel(l, reg);
 204         }
 205 }
 206 #endif
 207
 208 #ifdef CONFIG_ARCH_OMAP2PLUS
 209 void omap_set_dma_priority(int lch, int dst_port, int priority)
 210 {
 211         u32 ccr;
 212
 213         ccr = p->dma_read(CCR, lch);
 214         if (priority)
 215                 ccr |= (1 << 6);
 216         else
 217                 ccr &= ~(1 << 6);
 218         p->dma_write(ccr, CCR, lch);
 219 }
 220 #endif
 221 EXPORT_SYMBOL(omap_set_dma_priority);
 222
 223 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 224                                   int frame_count, int sync_mode,
 225                                   int dma_trigger, int src_or_dst_synch)
 226 {
 227         u32 l;
 228
 229         l = p->dma_read(CSDP, lch);
 230         l &= ~0x03;
 231         l |= data_type;
 232         p->dma_write(l, CSDP, lch);
 233
 234         if (dma_omap1()) {
 235                 u16 ccr;
 236
 237                 ccr = p->dma_read(CCR, lch);
 238                 ccr &= ~(1 << 5);
 239                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 240                         ccr |= 1 << 5;
 241                 p->dma_write(ccr, CCR, lch);
 242
 243                 ccr = p->dma_read(CCR2, lch);
 244                 ccr &= ~(1 << 2);
 245                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 246                         ccr |= 1 << 2;
 247                 p->dma_write(ccr, CCR2, lch);
 248         }
 249
 250         if (dma_omap2plus() && dma_trigger) {
 251                 u32 val;
 252
 253                 val = p->dma_read(CCR, lch);
 254
 255                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 256                 val &= ~((1 << 23) | (3 << 19) | 0x1f);
 257                 val |= (dma_trigger & ~0x1f) << 14;
 258                 val |= dma_trigger & 0x1f;
 259
 260                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 261                         val |= 1 << 5;
 262                 else
 263                         val &= ~(1 << 5);
 264
 265                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 266                         val |= 1 << 18;
 267                 else
 268                         val &= ~(1 << 18);
 269
 270                 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
 271                         val &= ~(1 << 24);      /* dest synch */
 272                         val |= (1 << 23);       /* Prefetch */
 273                 } else if (src_or_dst_synch) {
 274                         val |= 1 << 24;         /* source synch */
 275                 } else {
 276                         val &= ~(1 << 24);      /* dest synch */
 277                 }
 278                 p->dma_write(val, CCR, lch);
 279         }
 280
 281         p->dma_write(elem_count, CEN, lch);
 282         p->dma_write(frame_count, CFN, lch);
 283 }
 284 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 285
 286 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 287 {
 288         BUG_ON(omap_dma_in_1510_mode());
 289
 290         if (dma_omap1()) {
 291                 u16 w;
 292
 293                 w = p->dma_read(CCR2, lch);
 294                 w &= ~0x03;
 295
 296                 switch (mode) {
 297                 case OMAP_DMA_CONSTANT_FILL:
 298                         w |= 0x01;
 299                         break;
 300                 case OMAP_DMA_TRANSPARENT_COPY:
 301                         w |= 0x02;
 302                         break;
 303                 case OMAP_DMA_COLOR_DIS:
 304                         break;
 305                 default:
 306                         BUG();
 307                 }
 308                 p->dma_write(w, CCR2, lch);
 309
 310                 w = p->dma_read(LCH_CTRL, lch);
 311                 w &= ~0x0f;
 312                 /* Default is channel type 2D */
 313                 if (mode) {
 314                         p->dma_write(color, COLOR, lch);
 315                         w |= 1;         /* Channel type G */
 316                 }
 317                 p->dma_write(w, LCH_CTRL, lch);
 318         }
 319
 320         if (dma_omap2plus()) {
 321                 u32 val;
 322
 323                 val = p->dma_read(CCR, lch);
 324                 val &= ~((1 << 17) | (1 << 16));
 325
 326                 switch (mode) {
 327                 case OMAP_DMA_CONSTANT_FILL:
 328                         val |= 1 << 16;
 329                         break;
 330                 case OMAP_DMA_TRANSPARENT_COPY:
 331                         val |= 1 << 17;
 332                         break;
 333                 case OMAP_DMA_COLOR_DIS:
 334                         break;
 335                 default:
 336                         BUG();
 337                 }
 338                 p->dma_write(val, CCR, lch);
 339
 340                 color &= 0xffffff;
 341                 p->dma_write(color, COLOR, lch);
 342         }
 343 }
 344 EXPORT_SYMBOL(omap_set_dma_color_mode);
 345
 346 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 347 {
 348         if (dma_omap2plus()) {
 349                 u32 csdp;
 350
 351                 csdp = p->dma_read(CSDP, lch);
 352                 csdp &= ~(0x3 << 16);
 353                 csdp |= (mode << 16);
 354                 p->dma_write(csdp, CSDP, lch);
 355         }
 356 }
 357 EXPORT_SYMBOL(omap_set_dma_write_mode);
 358
 359 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 360 {
 361         if (dma_omap1() && !dma_omap15xx()) {
 362                 u32 l;
 363
 364                 l = p->dma_read(LCH_CTRL, lch);
 365                 l &= ~0x7;
 366                 l |= mode;
 367                 p->dma_write(l, LCH_CTRL, lch);
 368         }
 369 }
 370 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 371
 372 /* Note that src_port is only for omap1 */
 373 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 374                              unsigned long src_start,
 375                              int src_ei, int src_fi)
 376 {
 377         u32 l;
 378
 379         if (dma_omap1()) {
 380                 u16 w;
 381
 382                 w = p->dma_read(CSDP, lch);
 383                 w &= ~(0x1f << 2);
 384                 w |= src_port << 2;
 385                 p->dma_write(w, CSDP, lch);
 386         }
 387
 388         l = p->dma_read(CCR, lch);
 389         l &= ~(0x03 << 12);
 390         l |= src_amode << 12;
 391         p->dma_write(l, CCR, lch);
 392
 393         p->dma_write(src_start, CSSA, lch);
 394
 395         p->dma_write(src_ei, CSEI, lch);
 396         p->dma_write(src_fi, CSFI, lch);
 397 }
 398 EXPORT_SYMBOL(omap_set_dma_src_params);
 399
 400 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 401 {
 402         omap_set_dma_transfer_params(lch, params->data_type,
 403                                      params->elem_count, params->frame_count,
 404                                      params->sync_mode, params->trigger,
 405                                      params->src_or_dst_synch);
 406         omap_set_dma_src_params(lch, params->src_port,
 407                                 params->src_amode, params->src_start,
 408                                 params->src_ei, params->src_fi);
 409
 410         omap_set_dma_dest_params(lch, params->dst_port,
 411                                  params->dst_amode, params->dst_start,
 412                                  params->dst_ei, params->dst_fi);
 413         if (params->read_prio || params->write_prio)
 414                 omap_dma_set_prio_lch(lch, params->read_prio,
 415                                       params->write_prio);
 416 }
 417 EXPORT_SYMBOL(omap_set_dma_params);
 418
 419 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 420 {
 421         if (dma_omap2plus())
 422                 return;
 423
 424         p->dma_write(eidx, CSEI, lch);
 425         p->dma_write(fidx, CSFI, lch);
 426 }
 427 EXPORT_SYMBOL(omap_set_dma_src_index);
 428
 429 void omap_set_dma_src_data_pack(int lch, int enable)
 430 {
 431         u32 l;
 432
 433         l = p->dma_read(CSDP, lch);
 434         l &= ~(1 << 6);
 435         if (enable)
 436                 l |= (1 << 6);
 437         p->dma_write(l, CSDP, lch);
 438 }
 439 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 440
 441 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 442 {
 443         unsigned int burst = 0;
 444         u32 l;
 445
 446         l = p->dma_read(CSDP, lch);
 447         l &= ~(0x03 << 7);
 448
 449         switch (burst_mode) {
 450         case OMAP_DMA_DATA_BURST_DIS:
 451                 break;
 452         case OMAP_DMA_DATA_BURST_4:
 453                 if (dma_omap2plus())
 454                         burst = 0x1;
 455                 else
 456                         burst = 0x2;
 457                 break;
 458         case OMAP_DMA_DATA_BURST_8:
 459                 if (dma_omap2plus()) {
 460                         burst = 0x2;
 461                         break;
 462                 }
 463                 /*
 464                  * not supported by current hardware on OMAP1
 465                  * w |= (0x03 << 7);
 466                  * fall through
 467                  */
 468         case OMAP_DMA_DATA_BURST_16:
 469                 if (dma_omap2plus()) {
 470                         burst = 0x3;
 471                         break;
 472                 }
 473                 /*
 474                  * OMAP1 don't support burst 16
 475                  * fall through
 476                  */
 477         default:
 478                 BUG();
 479         }
 480
 481         l |= (burst << 7);
 482         p->dma_write(l, CSDP, lch);
 483 }
 484 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 485
 486 /* Note that dest_port is only for OMAP1 */
 487 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 488                               unsigned long dest_start,
 489                               int dst_ei, int dst_fi)
 490 {
 491         u32 l;
 492
 493         if (dma_omap1()) {
 494                 l = p->dma_read(CSDP, lch);
 495                 l &= ~(0x1f << 9);
 496                 l |= dest_port << 9;
 497                 p->dma_write(l, CSDP, lch);
 498         }
 499
 500         l = p->dma_read(CCR, lch);
 501         l &= ~(0x03 << 14);
 502         l |= dest_amode << 14;
 503         p->dma_write(l, CCR, lch);
 504
 505         p->dma_write(dest_start, CDSA, lch);
 506
 507         p->dma_write(dst_ei, CDEI, lch);
 508         p->dma_write(dst_fi, CDFI, lch);
 509 }
 510 EXPORT_SYMBOL(omap_set_dma_dest_params);
 511
 512 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 513 {
 514         if (dma_omap2plus())
 515                 return;
 516
 517         p->dma_write(eidx, CDEI, lch);
 518         p->dma_write(fidx, CDFI, lch);
 519 }
 520 EXPORT_SYMBOL(omap_set_dma_dest_index);
 521
 522 void omap_set_dma_dest_data_pack(int lch, int enable)
 523 {
 524         u32 l;
 525
 526         l = p->dma_read(CSDP, lch);
 527         l &= ~(1 << 13);
 528         if (enable)
 529                 l |= 1 << 13;
 530         p->dma_write(l, CSDP, lch);
 531 }
 532 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 533
 534 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 535 {
 536         unsigned int burst = 0;
 537         u32 l;
 538
 539         l = p->dma_read(CSDP, lch);
 540         l &= ~(0x03 << 14);
 541
 542         switch (burst_mode) {
 543         case OMAP_DMA_DATA_BURST_DIS:
 544                 break;
 545         case OMAP_DMA_DATA_BURST_4:
 546                 if (dma_omap2plus())
 547                         burst = 0x1;
 548                 else
 549                         burst = 0x2;
 550                 break;
 551         case OMAP_DMA_DATA_BURST_8:
 552                 if (dma_omap2plus())
 553                         burst = 0x2;
 554                 else
 555                         burst = 0x3;
 556                 break;
 557         case OMAP_DMA_DATA_BURST_16:
 558                 if (dma_omap2plus()) {
 559                         burst = 0x3;
 560                         break;
 561                 }
 562                 /*
 563                  * OMAP1 don't support burst 16
 564                  * fall through
 565                  */
 566         default:
 567                 printk(KERN_ERR "Invalid DMA burst mode\n");
 568                 BUG();
 569                 return;
 570         }
 571         l |= (burst << 14);
 572         p->dma_write(l, CSDP, lch);
 573 }
 574 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 575
 576 static inline void omap_enable_channel_irq(int lch)
 577 {
 578         /* Clear CSR */
 579         if (dma_omap1())
 580                 p->dma_read(CSR, lch);
 581         else
 582                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 583
 584         /* Enable some nice interrupts. */
 585         p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
 586 }
 587
 588 static inline void omap_disable_channel_irq(int lch)
 589 {
 590         /* disable channel interrupts */
 591         p->dma_write(0, CICR, lch);
 592         /* Clear CSR */
 593         if (dma_omap1())
 594                 p->dma_read(CSR, lch);
 595         else
 596                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 597 }
 598
 599 void omap_enable_dma_irq(int lch, u16 bits)
 600 {
 601         dma_chan[lch].enabled_irqs |= bits;
 602 }
 603 EXPORT_SYMBOL(omap_enable_dma_irq);
 604
 605 void omap_disable_dma_irq(int lch, u16 bits)
 606 {
 607         dma_chan[lch].enabled_irqs &= ~bits;
 608 }
 609 EXPORT_SYMBOL(omap_disable_dma_irq);
 610
 611 static inline void enable_lnk(int lch)
 612 {
 613         u32 l;
 614
 615         l = p->dma_read(CLNK_CTRL, lch);
 616
 617         if (dma_omap1())
 618                 l &= ~(1 << 14);
 619
 620         /* Set the ENABLE_LNK bits */
 621         if (dma_chan[lch].next_lch != -1)
 622                 l = dma_chan[lch].next_lch | (1 << 15);
 623
 624 #ifndef CONFIG_ARCH_OMAP1
 625         if (dma_omap2plus())
 626                 if (dma_chan[lch].next_linked_ch != -1)
 627                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 628 #endif
 629
 630         p->dma_write(l, CLNK_CTRL, lch);
 631 }
 632
 633 static inline void disable_lnk(int lch)
 634 {
 635         u32 l;
 636
 637         l = p->dma_read(CLNK_CTRL, lch);
 638
 639         /* Disable interrupts */
 640         omap_disable_channel_irq(lch);
 641
 642         if (dma_omap1()) {
 643                 /* Set the STOP_LNK bit */
 644                 l |= 1 << 14;
 645         }
 646
 647         if (dma_omap2plus()) {
 648                 /* Clear the ENABLE_LNK bit */
 649                 l &= ~(1 << 15);
 650         }
 651
 652         p->dma_write(l, CLNK_CTRL, lch);
 653         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 654 }
 655
 656 static inline void omap2_enable_irq_lch(int lch)
 657 {
 658         u32 val;
 659         unsigned long flags;
 660
 661         if (dma_omap1())
 662                 return;
 663
 664         spin_lock_irqsave(&dma_chan_lock, flags);
 665         /* clear IRQ STATUS */
 666         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 667         /* Enable interrupt */
 668         val = p->dma_read(IRQENABLE_L0, lch);
 669         val |= 1 << lch;
 670         p->dma_write(val, IRQENABLE_L0, lch);
 671         spin_unlock_irqrestore(&dma_chan_lock, flags);
 672 }
 673
 674 static inline void omap2_disable_irq_lch(int lch)
 675 {
 676         u32 val;
 677         unsigned long flags;
 678
 679         if (dma_omap1())
 680                 return;
 681
 682         spin_lock_irqsave(&dma_chan_lock, flags);
 683         /* Disable interrupt */
 684         val = p->dma_read(IRQENABLE_L0, lch);
 685         val &= ~(1 << lch);
 686         p->dma_write(val, IRQENABLE_L0, lch);
 687         /* clear IRQ STATUS */
 688         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 689         spin_unlock_irqrestore(&dma_chan_lock, flags);
 690 }
 691
 692 int omap_request_dma(int dev_id, const char *dev_name,
 693                      void (*callback)(int lch, u16 ch_status, void *data),
 694                      void *data, int *dma_ch_out)
 695 {
 696         int ch, free_ch = -1;
 697         unsigned long flags;
 698         struct omap_dma_lch *chan;
 699
 700         spin_lock_irqsave(&dma_chan_lock, flags);
 701         for (ch = 0; ch < dma_chan_count; ch++) {
 702                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 703                         free_ch = ch;
 704                         if (dev_id == 0)
 705                                 break;
 706                 }
 707         }
 708         if (free_ch == -1) {
 709                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 710                 return -EBUSY;
 711         }
 712         chan = dma_chan + free_ch;
 713         chan->dev_id = dev_id;
 714
 715         if (p->clear_lch_regs)
 716                 p->clear_lch_regs(free_ch);
 717
 718         if (dma_omap2plus())
 719                 omap_clear_dma(free_ch);
 720
 721         spin_unlock_irqrestore(&dma_chan_lock, flags);
 722
 723         chan->dev_name = dev_name;
 724         chan->callback = callback;
 725         chan->data = data;
 726         chan->flags = 0;
 727
 728 #ifndef CONFIG_ARCH_OMAP1
 729         if (dma_omap2plus()) {
 730                 chan->chain_id = -1;
 731                 chan->next_linked_ch = -1;
 732         }
 733 #endif
 734
 735         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 736
 737         if (dma_omap1())
 738                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 739         else if (dma_omap2plus())
 740                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 741                         OMAP2_DMA_TRANS_ERR_IRQ;
 742
 743         if (dma_omap16xx()) {
 744                 /* If the sync device is set, configure it dynamically. */
 745                 if (dev_id != 0) {
 746                         set_gdma_dev(free_ch + 1, dev_id);
 747                         dev_id = free_ch + 1;
 748                 }
 749                 /*
 750                  * Disable the 1510 compatibility mode and set the sync device
 751                  * id.
 752                  */
 753                 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
 754         } else if (dma_omap1()) {
 755                 p->dma_write(dev_id, CCR, free_ch);
 756         }
 757
 758         if (dma_omap2plus()) {
 759                 omap_enable_channel_irq(free_ch);
 760                 omap2_enable_irq_lch(free_ch);
 761         }
 762
 763         *dma_ch_out = free_ch;
 764
 765         return 0;
 766 }
 767 EXPORT_SYMBOL(omap_request_dma);
 768
 769 void omap_free_dma(int lch)
 770 {
 771         unsigned long flags;
 772
 773         if (dma_chan[lch].dev_id == -1) {
 774                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 775                        lch);
 776                 return;
 777         }
 778
 779         /* Disable interrupt for logical channel */
 780         if (dma_omap2plus())
 781                 omap2_disable_irq_lch(lch);
 782
 783         /* Disable all DMA interrupts for the channel. */
 784         omap_disable_channel_irq(lch);
 785
 786         /* Make sure the DMA transfer is stopped. */
 787         p->dma_write(0, CCR, lch);
 788
 789         /* Clear registers */
 790         if (dma_omap2plus())
 791                 omap_clear_dma(lch);
 792
 793         spin_lock_irqsave(&dma_chan_lock, flags);
 794         dma_chan[lch].dev_id = -1;
 795         dma_chan[lch].next_lch = -1;
 796         dma_chan[lch].callback = NULL;
 797         spin_unlock_irqrestore(&dma_chan_lock, flags);
 798 }
 799 EXPORT_SYMBOL(omap_free_dma);
 800
 801 /**
 802  * @brief omap_dma_set_global_params : Set global priority settings for dma
 803  *
 804  * @param arb_rate
 805  * @param max_fifo_depth
 806  * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
 807  *                                                 DMA_THREAD_RESERVE_ONET
 808  *                                                 DMA_THREAD_RESERVE_TWOT
 809  *                                                 DMA_THREAD_RESERVE_THREET
 810  */
 811 void
 812 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 813 {
 814         u32 reg;
 815
 816         if (dma_omap1()) {
 817                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 818                 return;
 819         }
 820
 821         if (max_fifo_depth == 0)
 822                 max_fifo_depth = 1;
 823         if (arb_rate == 0)
 824                 arb_rate = 1;
 825
 826         reg = 0xff & max_fifo_depth;
 827         reg |= (0x3 & tparams) << 12;
 828         reg |= (arb_rate & 0xff) << 16;
 829
 830         p->dma_write(reg, GCR, 0);
 831 }
 832 EXPORT_SYMBOL(omap_dma_set_global_params);
 833
 834 /**
 835  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 836  *
 837  * @param lch
 838  * @param read_prio - Read priority
 839  * @param write_prio - Write priority
 840  * Both of the above can be set with one of the following values :
 841  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 842  */
 843 int
 844 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 845                       unsigned char write_prio)
 846 {
 847         u32 l;
 848
 849         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 850                 printk(KERN_ERR "Invalid channel id\n");
 851                 return -EINVAL;
 852         }
 853         l = p->dma_read(CCR, lch);
 854         l &= ~((1 << 6) | (1 << 26));
 855         if (d->dev_caps & IS_RW_PRIORITY)
 856                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 857         else
 858                 l |= ((read_prio & 0x1) << 6);
 859
 860         p->dma_write(l, CCR, lch);
 861
 862         return 0;
 863 }
 864 EXPORT_SYMBOL(omap_dma_set_prio_lch);
 865
 866 /*
 867  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 868  * through omap_start_dma(). Any buffers in flight are discarded.
 869  */
 870 void omap_clear_dma(int lch)
 871 {
 872         unsigned long flags;
 873
 874         local_irq_save(flags);
 875         p->clear_dma(lch);
 876         local_irq_restore(flags);
 877 }
 878 EXPORT_SYMBOL(omap_clear_dma);
 879
 880 void omap_start_dma(int lch)
 881 {
 882         u32 l;
 883
 884         /*
 885          * The CPC/CDAC register needs to be initialized to zero
 886          * before starting dma transfer.
 887          */
 888         if (dma_omap15xx())
 889                 p->dma_write(0, CPC, lch);
 890         else
 891                 p->dma_write(0, CDAC, lch);
 892
 893         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 894                 int next_lch, cur_lch;
 895                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 896
 897                 dma_chan_link_map[lch] = 1;
 898                 /* Set the link register of the first channel */
 899                 enable_lnk(lch);
 900
 901                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 902                 cur_lch = dma_chan[lch].next_lch;
 903                 do {
 904                         next_lch = dma_chan[cur_lch].next_lch;
 905
 906                         /* The loop case: we've been here already */
 907                         if (dma_chan_link_map[cur_lch])
 908                                 break;
 909                         /* Mark the current channel */
 910                         dma_chan_link_map[cur_lch] = 1;
 911
 912                         enable_lnk(cur_lch);
 913                         omap_enable_channel_irq(cur_lch);
 914
 915                         cur_lch = next_lch;
 916                 } while (next_lch != -1);
 917         } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
 918                 p->dma_write(lch, CLNK_CTRL, lch);
 919
 920         omap_enable_channel_irq(lch);
 921
 922         l = p->dma_read(CCR, lch);
 923
 924         if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
 925                         l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
 926         l |= OMAP_DMA_CCR_EN;
 927
 928         /*
 929          * As dma_write() uses IO accessors which are weakly ordered, there
 930          * is no guarantee that data in coherent DMA memory will be visible
 931          * to the DMA device.  Add a memory barrier here to ensure that any
 932          * such data is visible prior to enabling DMA.
 933          */
 934         mb();
 935         p->dma_write(l, CCR, lch);
 936
 937         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 938 }
 939 EXPORT_SYMBOL(omap_start_dma);
 940
 941 void omap_stop_dma(int lch)
 942 {
 943         u32 l;
 944
 945         /* Disable all interrupts on the channel */
 946         omap_disable_channel_irq(lch);
 947
 948         l = p->dma_read(CCR, lch);
 949         if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
 950                         (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
 951                 int i = 0;
 952                 u32 sys_cf;
 953
 954                 /* Configure No-Standby */
 955                 l = p->dma_read(OCP_SYSCONFIG, lch);
 956                 sys_cf = l;
 957                 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
 958                 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
 959                 p->dma_write(l , OCP_SYSCONFIG, 0);
 960
 961                 l = p->dma_read(CCR, lch);
 962                 l &= ~OMAP_DMA_CCR_EN;
 963                 p->dma_write(l, CCR, lch);
 964
 965                 /* Wait for sDMA FIFO drain */
 966                 l = p->dma_read(CCR, lch);
 967                 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
 968                                         OMAP_DMA_CCR_WR_ACTIVE))) {
 969                         udelay(5);
 970                         i++;
 971                         l = p->dma_read(CCR, lch);
 972                 }
 973                 if (i >= 100)
 974                         pr_err("DMA drain did not complete on lch %d\n", lch);
 975                 /* Restore OCP_SYSCONFIG */
 976                 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
 977         } else {
 978                 l &= ~OMAP_DMA_CCR_EN;
 979                 p->dma_write(l, CCR, lch);
 980         }
 981
 982         /*
 983          * Ensure that data transferred by DMA is visible to any access
 984          * after DMA has been disabled.  This is important for coherent
 985          * DMA regions.
 986          */
 987         mb();
 988
 989         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 990                 int next_lch, cur_lch = lch;
 991                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 992
 993                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 994                 do {
 995                         /* The loop case: we've been here already */
 996                         if (dma_chan_link_map[cur_lch])
 997                                 break;
 998                         /* Mark the current channel */
 999                         dma_chan_link_map[cur_lch] = 1;
1000
1001                         disable_lnk(cur_lch);
1002
1003                         next_lch = dma_chan[cur_lch].next_lch;
1004                         cur_lch = next_lch;
1005                 } while (next_lch != -1);
1006         }
1007
1008         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
1009 }
1010 EXPORT_SYMBOL(omap_stop_dma);
1011
1012 /*
1013  * Allows changing the DMA callback function or data. This may be needed if
1014  * the driver shares a single DMA channel for multiple dma triggers.
1015  */
1016 int omap_set_dma_callback(int lch,
1017                           void (*callback)(int lch, u16 ch_status, void *data),
1018                           void *data)
1019 {
1020         unsigned long flags;
1021
1022         if (lch < 0)
1023                 return -ENODEV;
1024
1025         spin_lock_irqsave(&dma_chan_lock, flags);
1026         if (dma_chan[lch].dev_id == -1) {
1027                 printk(KERN_ERR "DMA callback for not set for free channel\n");
1028                 spin_unlock_irqrestore(&dma_chan_lock, flags);
1029                 return -EINVAL;
1030         }
1031         dma_chan[lch].callback = callback;
1032         dma_chan[lch].data = data;
1033         spin_unlock_irqrestore(&dma_chan_lock, flags);
1034
1035         return 0;
1036 }
1037 EXPORT_SYMBOL(omap_set_dma_callback);
1038
1039 /*
1040  * Returns current physical source address for the given DMA channel.
1041  * If the channel is running the caller must disable interrupts prior calling
1042  * this function and process the returned value before re-enabling interrupt to
1043  * prevent races with the interrupt handler. Note that in continuous mode there
1044  * is a chance for CSSA_L register overflow between the two reads resulting
1045  * in incorrect return value.
1046  */
1047 dma_addr_t omap_get_dma_src_pos(int lch)
1048 {
1049         dma_addr_t offset = 0;
1050
1051         if (dma_omap15xx())
1052                 offset = p->dma_read(CPC, lch);
1053         else
1054                 offset = p->dma_read(CSAC, lch);
1055
1056         if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
1057                 offset = p->dma_read(CSAC, lch);
1058
1059         if (!dma_omap15xx()) {
1060                 /*
1061                  * CDAC == 0 indicates that the DMA transfer on the channel has
1062                  * not been started (no data has been transferred so far).
1063                  * Return the programmed source start address in this case.
1064                  */
1065                 if (likely(p->dma_read(CDAC, lch)))
1066                         offset = p->dma_read(CSAC, lch);
1067                 else
1068                         offset = p->dma_read(CSSA, lch);
1069         }
1070
1071         if (dma_omap1())
1072                 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
1073
1074         return offset;
1075 }
1076 EXPORT_SYMBOL(omap_get_dma_src_pos);
1077
1078 /*
1079  * Returns current physical destination address for the given DMA channel.
1080  * If the channel is running the caller must disable interrupts prior calling
1081  * this function and process the returned value before re-enabling interrupt to
1082  * prevent races with the interrupt handler. Note that in continuous mode there
1083  * is a chance for CDSA_L register overflow between the two reads resulting
1084  * in incorrect return value.
1085  */
1086 dma_addr_t omap_get_dma_dst_pos(int lch)
1087 {
1088         dma_addr_t offset = 0;
1089
1090         if (dma_omap15xx())
1091                 offset = p->dma_read(CPC, lch);
1092         else
1093                 offset = p->dma_read(CDAC, lch);
1094
1095         /*
1096          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1097          * read before the DMA controller finished disabling the channel.
1098          */
1099         if (!dma_omap15xx() && offset == 0) {
1100                 offset = p->dma_read(CDAC, lch);
1101                 /*
1102                  * CDAC == 0 indicates that the DMA transfer on the channel has
1103                  * not been started (no data has been transferred so far).
1104                  * Return the programmed destination start address in this case.
1105                  */
1106                 if (unlikely(!offset))
1107                         offset = p->dma_read(CDSA, lch);
1108         }
1109
1110         if (dma_omap1())
1111                 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1112
1113         return offset;
1114 }
1115 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1116
1117 int omap_get_dma_active_status(int lch)
1118 {
1119         return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1120 }
1121 EXPORT_SYMBOL(omap_get_dma_active_status);
1122
1123 int omap_dma_running(void)
1124 {
1125         int lch;
1126
1127         if (dma_omap1())
1128                 if (omap_lcd_dma_running())
1129                         return 1;
1130
1131         for (lch = 0; lch < dma_chan_count; lch++)
1132                 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1133                         return 1;
1134
1135         return 0;
1136 }
1137
1138 /*
1139  * lch_queue DMA will start right after lch_head one is finished.
1140  * For this DMA link to start, you still need to start (see omap_start_dma)
1141  * the first one. That will fire up the entire queue.
1142  */
1143 void omap_dma_link_lch(int lch_head, int lch_queue)
1144 {
1145         if (omap_dma_in_1510_mode()) {
1146                 if (lch_head == lch_queue) {
1147                         p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1148                                                                 CCR, lch_head);
1149                         return;
1150                 }
1151                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1152                 BUG();
1153                 return;
1154         }
1155
1156         if ((dma_chan[lch_head].dev_id == -1) ||
1157             (dma_chan[lch_queue].dev_id == -1)) {
1158                 pr_err("omap_dma: trying to link non requested channels\n");
1159                 dump_stack();
1160         }
1161
1162         dma_chan[lch_head].next_lch = lch_queue;
1163 }
1164 EXPORT_SYMBOL(omap_dma_link_lch);
1165
1166 /*
1167  * Once the DMA queue is stopped, we can destroy it.
1168  */
1169 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1170 {
1171         if (omap_dma_in_1510_mode()) {
1172                 if (lch_head == lch_queue) {
1173                         p->dma_write(p->dma_read(CCR, lch_head) & ~(3 << 8),
1174                                                                 CCR, lch_head);
1175                         return;
1176                 }
1177                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1178                 BUG();
1179                 return;
1180         }
1181
1182         if (dma_chan[lch_head].next_lch != lch_queue ||
1183             dma_chan[lch_head].next_lch == -1) {
1184                 pr_err("omap_dma: trying to unlink non linked channels\n");
1185                 dump_stack();
1186         }
1187
1188         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1189             (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1190                 pr_err("omap_dma: You need to stop the DMA channels before unlinking\n");
1191                 dump_stack();
1192         }
1193
1194         dma_chan[lch_head].next_lch = -1;
1195 }
1196 EXPORT_SYMBOL(omap_dma_unlink_lch);
1197
1198 #ifndef CONFIG_ARCH_OMAP1
1199 /* Create chain of DMA channesls */
1200 static void create_dma_lch_chain(int lch_head, int lch_queue)
1201 {
1202         u32 l;
1203
1204         /* Check if this is the first link in chain */
1205         if (dma_chan[lch_head].next_linked_ch == -1) {
1206                 dma_chan[lch_head].next_linked_ch = lch_queue;
1207                 dma_chan[lch_head].prev_linked_ch = lch_queue;
1208                 dma_chan[lch_queue].next_linked_ch = lch_head;
1209                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1210         }
1211
1212         /* a link exists, link the new channel in circular chain */
1213         else {
1214                 dma_chan[lch_queue].next_linked_ch =
1215                                         dma_chan[lch_head].next_linked_ch;
1216                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1217                 dma_chan[lch_head].next_linked_ch = lch_queue;
1218                 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1219                                         lch_queue;
1220         }
1221
1222         l = p->dma_read(CLNK_CTRL, lch_head);
1223         l &= ~(0x1f);
1224         l |= lch_queue;
1225         p->dma_write(l, CLNK_CTRL, lch_head);
1226
1227         l = p->dma_read(CLNK_CTRL, lch_queue);
1228         l &= ~(0x1f);
1229         l |= (dma_chan[lch_queue].next_linked_ch);
1230         p->dma_write(l, CLNK_CTRL, lch_queue);
1231 }
1232
1233 /**
1234  * @brief omap_request_dma_chain : Request a chain of DMA channels
1235  *
1236  * @param dev_id - Device id using the dma channel
1237  * @param dev_name - Device name
1238  * @param callback - Call back function
1239  * @chain_id -
1240  * @no_of_chans - Number of channels requested
1241  * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1242  *                                            OMAP_DMA_DYNAMIC_CHAIN
1243  * @params - Channel parameters
1244  *
1245  * @return - Success : 0
1246  *           Failure: -EINVAL/-ENOMEM
1247  */
1248 int omap_request_dma_chain(int dev_id, const char *dev_name,
1249                            void (*callback) (int lch, u16 ch_status,
1250                                              void *data),
1251                            int *chain_id, int no_of_chans, int chain_mode,
1252                            struct omap_dma_channel_params params)
1253 {
1254         int *channels;
1255         int i, err;
1256
1257         /* Is the chain mode valid ? */
1258         if (chain_mode != OMAP_DMA_STATIC_CHAIN
1259                         && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1260                 printk(KERN_ERR "Invalid chain mode requested\n");
1261                 return -EINVAL;
1262         }
1263
1264         if (unlikely((no_of_chans < 1
1265                         || no_of_chans > dma_lch_count))) {
1266                 printk(KERN_ERR "Invalid Number of channels requested\n");
1267                 return -EINVAL;
1268         }
1269
1270         /*
1271          * Allocate a queue to maintain the status of the channels
1272          * in the chain
1273          */
1274         channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1275         if (channels == NULL) {
1276                 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1277                 return -ENOMEM;
1278         }
1279
1280         /* request and reserve DMA channels for the chain */
1281         for (i = 0; i < no_of_chans; i++) {
1282                 err = omap_request_dma(dev_id, dev_name,
1283                                         callback, NULL, &channels[i]);
1284                 if (err < 0) {
1285                         int j;
1286                         for (j = 0; j < i; j++)
1287                                 omap_free_dma(channels[j]);
1288                         kfree(channels);
1289                         printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1290                         return err;
1291                 }
1292                 dma_chan[channels[i]].prev_linked_ch = -1;
1293                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1294
1295                 /*
1296                  * Allowing client drivers to set common parameters now,
1297                  * so that later only relevant (src_start, dest_start
1298                  * and element count) can be set
1299                  */
1300                 omap_set_dma_params(channels[i], &params);
1301         }
1302
1303         *chain_id = channels[0];
1304         dma_linked_lch[*chain_id].linked_dmach_q = channels;
1305         dma_linked_lch[*chain_id].chain_mode = chain_mode;
1306         dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1307         dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1308
1309         for (i = 0; i < no_of_chans; i++)
1310                 dma_chan[channels[i]].chain_id = *chain_id;
1311
1312         /* Reset the Queue pointers */
1313         OMAP_DMA_CHAIN_QINIT(*chain_id);
1314
1315         /* Set up the chain */
1316         if (no_of_chans == 1)
1317                 create_dma_lch_chain(channels[0], channels[0]);
1318         else {
1319                 for (i = 0; i < (no_of_chans - 1); i++)
1320                         create_dma_lch_chain(channels[i], channels[i + 1]);
1321         }
1322
1323         return 0;
1324 }
1325 EXPORT_SYMBOL(omap_request_dma_chain);
1326
1327 /**
1328  * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1329  * params after setting it. Dont do this while dma is running!!
1330  *
1331  * @param chain_id - Chained logical channel id.
1332  * @param params
1333  *
1334  * @return - Success : 0
1335  *           Failure : -EINVAL
1336  */
1337 int omap_modify_dma_chain_params(int chain_id,
1338                                 struct omap_dma_channel_params params)
1339 {
1340         int *channels;
1341         u32 i;
1342
1343         /* Check for input params */
1344         if (unlikely((chain_id < 0
1345                         || chain_id >= dma_lch_count))) {
1346                 printk(KERN_ERR "Invalid chain id\n");
1347                 return -EINVAL;
1348         }
1349
1350         /* Check if the chain exists */
1351         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1352                 printk(KERN_ERR "Chain doesn't exists\n");
1353                 return -EINVAL;
1354         }
1355         channels = dma_linked_lch[chain_id].linked_dmach_q;
1356
1357         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1358                 /*
1359                  * Allowing client drivers to set common parameters now,
1360                  * so that later only relevant (src_start, dest_start
1361                  * and element count) can be set
1362                  */
1363                 omap_set_dma_params(channels[i], &params);
1364         }
1365
1366         return 0;
1367 }
1368 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1369
1370 /**
1371  * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1372  *
1373  * @param chain_id
1374  *
1375  * @return - Success : 0
1376  *           Failure : -EINVAL
1377  */
1378 int omap_free_dma_chain(int chain_id)
1379 {
1380         int *channels;
1381         u32 i;
1382
1383         /* Check for input params */
1384         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1385                 printk(KERN_ERR "Invalid chain id\n");
1386                 return -EINVAL;
1387         }
1388
1389         /* Check if the chain exists */
1390         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1391                 printk(KERN_ERR "Chain doesn't exists\n");
1392                 return -EINVAL;
1393         }
1394
1395         channels = dma_linked_lch[chain_id].linked_dmach_q;
1396         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1397                 dma_chan[channels[i]].next_linked_ch = -1;
1398                 dma_chan[channels[i]].prev_linked_ch = -1;
1399                 dma_chan[channels[i]].chain_id = -1;
1400                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1401                 omap_free_dma(channels[i]);
1402         }
1403
1404         kfree(channels);
1405
1406         dma_linked_lch[chain_id].linked_dmach_q = NULL;
1407         dma_linked_lch[chain_id].chain_mode = -1;
1408         dma_linked_lch[chain_id].chain_state = -1;
1409
1410         return (0);
1411 }
1412 EXPORT_SYMBOL(omap_free_dma_chain);
1413
1414 /**
1415  * @brief omap_dma_chain_status - Check if the chain is in
1416  * active / inactive state.
1417  * @param chain_id
1418  *
1419  * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1420  *           Failure : -EINVAL
1421  */
1422 int omap_dma_chain_status(int chain_id)
1423 {
1424         /* Check for input params */
1425         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1426                 printk(KERN_ERR "Invalid chain id\n");
1427                 return -EINVAL;
1428         }
1429
1430         /* Check if the chain exists */
1431         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1432                 printk(KERN_ERR "Chain doesn't exists\n");
1433                 return -EINVAL;
1434         }
1435         pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1436                         dma_linked_lch[chain_id].q_count);
1437
1438         if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1439                 return OMAP_DMA_CHAIN_INACTIVE;
1440
1441         return OMAP_DMA_CHAIN_ACTIVE;
1442 }
1443 EXPORT_SYMBOL(omap_dma_chain_status);
1444
1445 /**
1446  * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1447  * set the params and start the transfer.
1448  *
1449  * @param chain_id
1450  * @param src_start - buffer start address
1451  * @param dest_start - Dest address
1452  * @param elem_count
1453  * @param frame_count
1454  * @param callbk_data - channel callback parameter data.
1455  *
1456  * @return  - Success : 0
1457  *            Failure: -EINVAL/-EBUSY
1458  */
1459 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1460                         int elem_count, int frame_count, void *callbk_data)
1461 {
1462         int *channels;
1463         u32 l, lch;
1464         int start_dma = 0;
1465
1466         /*
1467          * if buffer size is less than 1 then there is
1468          * no use of starting the chain
1469          */
1470         if (elem_count < 1) {
1471                 printk(KERN_ERR "Invalid buffer size\n");
1472                 return -EINVAL;
1473         }
1474
1475         /* Check for input params */
1476         if (unlikely((chain_id < 0
1477                         || chain_id >= dma_lch_count))) {
1478                 printk(KERN_ERR "Invalid chain id\n");
1479                 return -EINVAL;
1480         }
1481
1482         /* Check if the chain exists */
1483         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1484                 printk(KERN_ERR "Chain doesn't exist\n");
1485                 return -EINVAL;
1486         }
1487
1488         /* Check if all the channels in chain are in use */
1489         if (OMAP_DMA_CHAIN_QFULL(chain_id))
1490                 return -EBUSY;
1491
1492         /* Frame count may be negative in case of indexed transfers */
1493         channels = dma_linked_lch[chain_id].linked_dmach_q;
1494
1495         /* Get a free channel */
1496         lch = channels[dma_linked_lch[chain_id].q_tail];
1497
1498         /* Store the callback data */
1499         dma_chan[lch].data = callbk_data;
1500
1501         /* Increment the q_tail */
1502         OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1503
1504         /* Set the params to the free channel */
1505         if (src_start != 0)
1506                 p->dma_write(src_start, CSSA, lch);
1507         if (dest_start != 0)
1508                 p->dma_write(dest_start, CDSA, lch);
1509
1510         /* Write the buffer size */
1511         p->dma_write(elem_count, CEN, lch);
1512         p->dma_write(frame_count, CFN, lch);
1513
1514         /*
1515          * If the chain is dynamically linked,
1516          * then we may have to start the chain if its not active
1517          */
1518         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1519
1520                 /*
1521                  * In Dynamic chain, if the chain is not started,
1522                  * queue the channel
1523                  */
1524                 if (dma_linked_lch[chain_id].chain_state ==
1525                                                 DMA_CHAIN_NOTSTARTED) {
1526                         /* Enable the link in previous channel */
1527                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1528                                                                 DMA_CH_QUEUED)
1529                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1530                         dma_chan[lch].state = DMA_CH_QUEUED;
1531                 }
1532
1533                 /*
1534                  * Chain is already started, make sure its active,
1535                  * if not then start the chain
1536                  */
1537                 else {
1538                         start_dma = 1;
1539
1540                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1541                                                         DMA_CH_STARTED) {
1542                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1543                                 dma_chan[lch].state = DMA_CH_QUEUED;
1544                                 start_dma = 0;
1545                                 if (0 == ((1 << 7) & p->dma_read(
1546                                         CCR, dma_chan[lch].prev_linked_ch))) {
1547                                         disable_lnk(dma_chan[lch].
1548                                                     prev_linked_ch);
1549                                         pr_debug("\n prev ch is stopped\n");
1550                                         start_dma = 1;
1551                                 }
1552                         }
1553
1554                         else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1555                                                         == DMA_CH_QUEUED) {
1556                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1557                                 dma_chan[lch].state = DMA_CH_QUEUED;
1558                                 start_dma = 0;
1559                         }
1560                         omap_enable_channel_irq(lch);
1561
1562                         l = p->dma_read(CCR, lch);
1563
1564                         if ((0 == (l & (1 << 24))))
1565                                 l &= ~(1 << 25);
1566                         else
1567                                 l |= (1 << 25);
1568                         if (start_dma == 1) {
1569                                 if (0 == (l & (1 << 7))) {
1570                                         l |= (1 << 7);
1571                                         dma_chan[lch].state = DMA_CH_STARTED;
1572                                         pr_debug("starting %d\n", lch);
1573                                         p->dma_write(l, CCR, lch);
1574                                 } else
1575                                         start_dma = 0;
1576                         } else {
1577                                 if (0 == (l & (1 << 7)))
1578                                         p->dma_write(l, CCR, lch);
1579                         }
1580                         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1581                 }
1582         }
1583
1584         return 0;
1585 }
1586 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1587
1588 /**
1589  * @brief omap_start_dma_chain_transfers - Start the chain
1590  *
1591  * @param chain_id
1592  *
1593  * @return - Success : 0
1594  *           Failure : -EINVAL/-EBUSY
1595  */
1596 int omap_start_dma_chain_transfers(int chain_id)
1597 {
1598         int *channels;
1599         u32 l, i;
1600
1601         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1602                 printk(KERN_ERR "Invalid chain id\n");
1603                 return -EINVAL;
1604         }
1605
1606         channels = dma_linked_lch[chain_id].linked_dmach_q;
1607
1608         if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1609                 printk(KERN_ERR "Chain is already started\n");
1610                 return -EBUSY;
1611         }
1612
1613         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1614                 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1615                                                                         i++) {
1616                         enable_lnk(channels[i]);
1617                         omap_enable_channel_irq(channels[i]);
1618                 }
1619         } else {
1620                 omap_enable_channel_irq(channels[0]);
1621         }
1622
1623         l = p->dma_read(CCR, channels[0]);
1624         l |= (1 << 7);
1625         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1626         dma_chan[channels[0]].state = DMA_CH_STARTED;
1627
1628         if ((0 == (l & (1 << 24))))
1629                 l &= ~(1 << 25);
1630         else
1631                 l |= (1 << 25);
1632         p->dma_write(l, CCR, channels[0]);
1633
1634         dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1635
1636         return 0;
1637 }
1638 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1639
1640 /**
1641  * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1642  *
1643  * @param chain_id
1644  *
1645  * @return - Success : 0
1646  *           Failure : EINVAL
1647  */
1648 int omap_stop_dma_chain_transfers(int chain_id)
1649 {
1650         int *channels;
1651         u32 l, i;
1652         u32 sys_cf = 0;
1653
1654         /* Check for input params */
1655         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1656                 printk(KERN_ERR "Invalid chain id\n");
1657                 return -EINVAL;
1658         }
1659
1660         /* Check if the chain exists */
1661         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1662                 printk(KERN_ERR "Chain doesn't exists\n");
1663                 return -EINVAL;
1664         }
1665         channels = dma_linked_lch[chain_id].linked_dmach_q;
1666
1667         if (IS_DMA_ERRATA(DMA_ERRATA_i88)) {
1668                 sys_cf = p->dma_read(OCP_SYSCONFIG, 0);
1669                 l = sys_cf;
1670                 /* Middle mode reg set no Standby */
1671                 l &= ~((1 << 12)|(1 << 13));
1672                 p->dma_write(l, OCP_SYSCONFIG, 0);
1673         }
1674
1675         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1676
1677                 /* Stop the Channel transmission */
1678                 l = p->dma_read(CCR, channels[i]);
1679                 l &= ~(1 << 7);
1680                 p->dma_write(l, CCR, channels[i]);
1681
1682                 /* Disable the link in all the channels */
1683                 disable_lnk(channels[i]);
1684                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1685
1686         }
1687         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1688
1689         /* Reset the Queue pointers */
1690         OMAP_DMA_CHAIN_QINIT(chain_id);
1691
1692         if (IS_DMA_ERRATA(DMA_ERRATA_i88))
1693                 p->dma_write(sys_cf, OCP_SYSCONFIG, 0);
1694
1695         return 0;
1696 }
1697 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1698
1699 /* Get the index of the ongoing DMA in chain */
1700 /**
1701  * @brief omap_get_dma_chain_index - Get the element and frame index
1702  * of the ongoing DMA in chain
1703  *
1704  * @param chain_id
1705  * @param ei - Element index
1706  * @param fi - Frame index
1707  *
1708  * @return - Success : 0
1709  *           Failure : -EINVAL
1710  */
1711 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1712 {
1713         int lch;
1714         int *channels;
1715
1716         /* Check for input params */
1717         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1718                 printk(KERN_ERR "Invalid chain id\n");
1719                 return -EINVAL;
1720         }
1721
1722         /* Check if the chain exists */
1723         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1724                 printk(KERN_ERR "Chain doesn't exists\n");
1725                 return -EINVAL;
1726         }
1727         if ((!ei) || (!fi))
1728                 return -EINVAL;
1729
1730         channels = dma_linked_lch[chain_id].linked_dmach_q;
1731
1732         /* Get the current channel */
1733         lch = channels[dma_linked_lch[chain_id].q_head];
1734
1735         *ei = p->dma_read(CCEN, lch);
1736         *fi = p->dma_read(CCFN, lch);
1737
1738         return 0;
1739 }
1740 EXPORT_SYMBOL(omap_get_dma_chain_index);
1741
1742 /**
1743  * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1744  * ongoing DMA in chain
1745  *
1746  * @param chain_id
1747  *
1748  * @return - Success : Destination position
1749  *           Failure : -EINVAL
1750  */
1751 int omap_get_dma_chain_dst_pos(int chain_id)
1752 {
1753         int lch;
1754         int *channels;
1755
1756         /* Check for input params */
1757         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1758                 printk(KERN_ERR "Invalid chain id\n");
1759                 return -EINVAL;
1760         }
1761
1762         /* Check if the chain exists */
1763         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1764                 printk(KERN_ERR "Chain doesn't exists\n");
1765                 return -EINVAL;
1766         }
1767
1768         channels = dma_linked_lch[chain_id].linked_dmach_q;
1769
1770         /* Get the current channel */
1771         lch = channels[dma_linked_lch[chain_id].q_head];
1772
1773         return p->dma_read(CDAC, lch);
1774 }
1775 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1776
1777 /**
1778  * @brief omap_get_dma_chain_src_pos - Get the source position
1779  * of the ongoing DMA in chain
1780  * @param chain_id
1781  *
1782  * @return - Success : Destination position
1783  *           Failure : -EINVAL
1784  */
1785 int omap_get_dma_chain_src_pos(int chain_id)
1786 {
1787         int lch;
1788         int *channels;
1789
1790         /* Check for input params */
1791         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1792                 printk(KERN_ERR "Invalid chain id\n");
1793                 return -EINVAL;
1794         }
1795
1796         /* Check if the chain exists */
1797         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1798                 printk(KERN_ERR "Chain doesn't exists\n");
1799                 return -EINVAL;
1800         }
1801
1802         channels = dma_linked_lch[chain_id].linked_dmach_q;
1803
1804         /* Get the current channel */
1805         lch = channels[dma_linked_lch[chain_id].q_head];
1806
1807         return p->dma_read(CSAC, lch);
1808 }
1809 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1810 #endif  /* ifndef CONFIG_ARCH_OMAP1 */
1811
1812 /*----------------------------------------------------------------------------*/
1813
1814 #ifdef CONFIG_ARCH_OMAP1
1815
1816 static int omap1_dma_handle_ch(int ch)
1817 {
1818         u32 csr;
1819
1820         if (enable_1510_mode && ch >= 6) {
1821                 csr = dma_chan[ch].saved_csr;
1822                 dma_chan[ch].saved_csr = 0;
1823         } else
1824                 csr = p->dma_read(CSR, ch);
1825         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1826                 dma_chan[ch + 6].saved_csr = csr >> 7;
1827                 csr &= 0x7f;
1828         }
1829         if ((csr & 0x3f) == 0)
1830                 return 0;
1831         if (unlikely(dma_chan[ch].dev_id == -1)) {
1832                 pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
1833                         ch, csr);
1834                 return 0;
1835         }
1836         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1837                 pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
1838         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1839                 pr_warn("DMA synchronization event drop occurred with device %d\n",
1840                         dma_chan[ch].dev_id);
1841         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1842                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1843         if (likely(dma_chan[ch].callback != NULL))
1844                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1845
1846         return 1;
1847 }
1848
1849 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1850 {
1851         int ch = ((int) dev_id) - 1;
1852         int handled = 0;
1853
1854         for (;;) {
1855                 int handled_now = 0;
1856
1857                 handled_now += omap1_dma_handle_ch(ch);
1858                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1859                         handled_now += omap1_dma_handle_ch(ch + 6);
1860                 if (!handled_now)
1861                         break;
1862                 handled += handled_now;
1863         }
1864
1865         return handled ? IRQ_HANDLED : IRQ_NONE;
1866 }
1867
1868 #else
1869 #define omap1_dma_irq_handler   NULL
1870 #endif
1871
1872 #ifdef CONFIG_ARCH_OMAP2PLUS
1873
1874 static int omap2_dma_handle_ch(int ch)
1875 {
1876         u32 status = p->dma_read(CSR, ch);
1877
1878         if (!status) {
1879                 if (printk_ratelimit())
1880                         pr_warn("Spurious DMA IRQ for lch %d\n", ch);
1881                 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1882                 return 0;
1883         }
1884         if (unlikely(dma_chan[ch].dev_id == -1)) {
1885                 if (printk_ratelimit())
1886                         pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
1887                                 status, ch);
1888                 return 0;
1889         }
1890         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1891                 pr_info("DMA synchronization event drop occurred with device %d\n",
1892                         dma_chan[ch].dev_id);
1893         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1894                 printk(KERN_INFO "DMA transaction error with device %d\n",
1895                        dma_chan[ch].dev_id);
1896                 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1897                         u32 ccr;
1898
1899                         ccr = p->dma_read(CCR, ch);
1900                         ccr &= ~OMAP_DMA_CCR_EN;
1901                         p->dma_write(ccr, CCR, ch);
1902                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1903                 }
1904         }
1905         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1906                 printk(KERN_INFO "DMA secure error with device %d\n",
1907                        dma_chan[ch].dev_id);
1908         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1909                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1910                        dma_chan[ch].dev_id);
1911
1912         p->dma_write(status, CSR, ch);
1913         p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1914         /* read back the register to flush the write */
1915         p->dma_read(IRQSTATUS_L0, ch);
1916
1917         /* If the ch is not chained then chain_id will be -1 */
1918         if (dma_chan[ch].chain_id != -1) {
1919                 int chain_id = dma_chan[ch].chain_id;
1920                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1921                 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1922                         dma_chan[dma_chan[ch].next_linked_ch].state =
1923                                                         DMA_CH_STARTED;
1924                 if (dma_linked_lch[chain_id].chain_mode ==
1925                                                 OMAP_DMA_DYNAMIC_CHAIN)
1926                         disable_lnk(ch);
1927
1928                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1929                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1930
1931                 status = p->dma_read(CSR, ch);
1932                 p->dma_write(status, CSR, ch);
1933         }
1934
1935         if (likely(dma_chan[ch].callback != NULL))
1936                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1937
1938         return 0;
1939 }
1940
1941 /* STATUS register count is from 1-32 while our is 0-31 */
1942 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1943 {
1944         u32 val, enable_reg;
1945         int i;
1946
1947         val = p->dma_read(IRQSTATUS_L0, 0);
1948         if (val == 0) {
1949                 if (printk_ratelimit())
1950                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1951                 return IRQ_HANDLED;
1952         }
1953         enable_reg = p->dma_read(IRQENABLE_L0, 0);
1954         val &= enable_reg; /* Dispatch only relevant interrupts */
1955         for (i = 0; i < dma_lch_count && val != 0; i++) {
1956                 if (val & 1)
1957                         omap2_dma_handle_ch(i);
1958                 val >>= 1;
1959         }
1960
1961         return IRQ_HANDLED;
1962 }
1963
1964 static struct irqaction omap24xx_dma_irq = {
1965         .name = "DMA",
1966         .handler = omap2_dma_irq_handler,
1967         .flags = IRQF_DISABLED
1968 };
1969
1970 #else
1971 static struct irqaction omap24xx_dma_irq;
1972 #endif
1973
1974 /*----------------------------------------------------------------------------*/
1975
1976 void omap_dma_global_context_save(void)
1977 {
1978         omap_dma_global_context.dma_irqenable_l0 =
1979                 p->dma_read(IRQENABLE_L0, 0);
1980         omap_dma_global_context.dma_ocp_sysconfig =
1981                 p->dma_read(OCP_SYSCONFIG, 0);
1982         omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1983 }
1984
1985 void omap_dma_global_context_restore(void)
1986 {
1987         int ch;
1988
1989         p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1990         p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1991                 OCP_SYSCONFIG, 0);
1992         p->dma_write(omap_dma_global_context.dma_irqenable_l0,
1993                 IRQENABLE_L0, 0);
1994
1995         if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
1996                 p->dma_write(0x3 , IRQSTATUS_L0, 0);
1997
1998         for (ch = 0; ch < dma_chan_count; ch++)
1999                 if (dma_chan[ch].dev_id != -1)
2000                         omap_clear_dma(ch);
2001 }
2002
2003 static int omap_system_dma_probe(struct platform_device *pdev)
2004 {
2005         int ch, ret = 0;
2006         int dma_irq;
2007         char irq_name[4];
2008         int irq_rel;
2009
2010         p = pdev->dev.platform_data;
2011         if (!p) {
2012                 dev_err(&pdev->dev,
2013                         "%s: System DMA initialized without platform data\n",
2014                         __func__);
2015                 return -EINVAL;
2016         }
2017
2018         d                       = p->dma_attr;
2019         errata                  = p->errata;
2020
2021         if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
2022                         && (omap_dma_reserve_channels < d->lch_count))
2023                 d->lch_count    = omap_dma_reserve_channels;
2024
2025         dma_lch_count           = d->lch_count;
2026         dma_chan_count          = dma_lch_count;
2027         dma_chan                = d->chan;
2028         enable_1510_mode        = d->dev_caps & ENABLE_1510_MODE;
2029
2030         if (dma_omap2plus()) {
2031                 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2032                                                 dma_lch_count, GFP_KERNEL);
2033                 if (!dma_linked_lch) {
2034                         ret = -ENOMEM;
2035                         goto exit_dma_lch_fail;
2036                 }
2037         }
2038
2039         spin_lock_init(&dma_chan_lock);
2040         for (ch = 0; ch < dma_chan_count; ch++) {
2041                 omap_clear_dma(ch);
2042                 if (dma_omap2plus())
2043                         omap2_disable_irq_lch(ch);
2044
2045                 dma_chan[ch].dev_id = -1;
2046                 dma_chan[ch].next_lch = -1;
2047
2048                 if (ch >= 6 && enable_1510_mode)
2049                         continue;
2050
2051                 if (dma_omap1()) {
2052                         /*
2053                          * request_irq() doesn't like dev_id (ie. ch) being
2054                          * zero, so we have to kludge around this.
2055                          */
2056                         sprintf(&irq_name[0], "%d", ch);
2057                         dma_irq = platform_get_irq_byname(pdev, irq_name);
2058
2059                         if (dma_irq < 0) {
2060                                 ret = dma_irq;
2061                                 goto exit_dma_irq_fail;
2062                         }
2063
2064                         /* INT_DMA_LCD is handled in lcd_dma.c */
2065                         if (dma_irq == INT_DMA_LCD)
2066                                 continue;
2067
2068                         ret = request_irq(dma_irq,
2069                                         omap1_dma_irq_handler, 0, "DMA",
2070                                         (void *) (ch + 1));
2071                         if (ret != 0)
2072                                 goto exit_dma_irq_fail;
2073                 }
2074         }
2075
2076         if (d->dev_caps & IS_RW_PRIORITY)
2077                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2078                                 DMA_DEFAULT_FIFO_DEPTH, 0);
2079
2080         if (dma_omap2plus()) {
2081                 strcpy(irq_name, "0");
2082                 dma_irq = platform_get_irq_byname(pdev, irq_name);
2083                 if (dma_irq < 0) {
2084                         dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
2085                         goto exit_dma_lch_fail;
2086                 }
2087                 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
2088                 if (ret) {
2089                         dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
2090                                 dma_irq, ret);
2091                         goto exit_dma_lch_fail;
2092                 }
2093         }
2094
2095         /* reserve dma channels 0 and 1 in high security devices on 34xx */
2096         if (d->dev_caps & HS_CHANNELS_RESERVED) {
2097                 pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
2098                 dma_chan[0].dev_id = 0;
2099                 dma_chan[1].dev_id = 1;
2100         }
2101         p->show_dma_caps();
2102         return 0;
2103
2104 exit_dma_irq_fail:
2105         dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
2106                 dma_irq, ret);
2107         for (irq_rel = 0; irq_rel < ch; irq_rel++) {
2108                 dma_irq = platform_get_irq(pdev, irq_rel);
2109                 free_irq(dma_irq, (void *)(irq_rel + 1));
2110         }
2111
2112 exit_dma_lch_fail:
2113         kfree(p);
2114         kfree(d);
2115         kfree(dma_chan);
2116         return ret;
2117 }
2118
2119 static int omap_system_dma_remove(struct platform_device *pdev)
2120 {
2121         int dma_irq;
2122
2123         if (dma_omap2plus()) {
2124                 char irq_name[4];
2125                 strcpy(irq_name, "0");
2126                 dma_irq = platform_get_irq_byname(pdev, irq_name);
2127                 remove_irq(dma_irq, &omap24xx_dma_irq);
2128         } else {
2129                 int irq_rel = 0;
2130                 for ( ; irq_rel < dma_chan_count; irq_rel++) {
2131                         dma_irq = platform_get_irq(pdev, irq_rel);
2132                         free_irq(dma_irq, (void *)(irq_rel + 1));
2133                 }
2134         }
2135         kfree(p);
2136         kfree(d);
2137         kfree(dma_chan);
2138         return 0;
2139 }
2140
2141 static struct platform_driver omap_system_dma_driver = {
2142         .probe          = omap_system_dma_probe,
2143         .remove         = omap_system_dma_remove,
2144         .driver         = {
2145                 .name   = "omap_dma_system"
2146         },
2147 };
2148
2149 static int __init omap_system_dma_init(void)
2150 {
2151         return platform_driver_register(&omap_system_dma_driver);
2152 }
2153 arch_initcall(omap_system_dma_init);
2154
2155 static void __exit omap_system_dma_exit(void)
2156 {
2157         platform_driver_unregister(&omap_system_dma_driver);
2158 }
2159
2160 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
2161 MODULE_LICENSE("GPL");
2162 MODULE_ALIAS("platform:" DRIVER_NAME);
2163 MODULE_AUTHOR("Texas Instruments Inc");
2164
2165 /*
2166  * Reserve the omap SDMA channels using cmdline bootarg
2167  * "omap_dma_reserve_ch=". The valid range is 1 to 32
2168  */
2169 static int __init omap_dma_cmdline_reserve_ch(char *str)
2170 {
2171         if (get_option(&str, &omap_dma_reserve_channels) != 1)
2172                 omap_dma_reserve_channels = 0;
2173         return 1;
2174 }
2175
2176 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2177
2178