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_irqenable_l1;
  74         u32 dma_ocp_sysconfig;
  75         u32 dma_gcr;
  76 } omap_dma_global_context;
  77
  78 struct dma_link_info {
  79         int *linked_dmach_q;
  80         int no_of_lchs_linked;
  81
  82         int q_count;
  83         int q_tail;
  84         int q_head;
  85
  86         int chain_state;
  87         int chain_mode;
  88
  89 };
  90
  91 static struct dma_link_info *dma_linked_lch;
  92
  93 #ifndef CONFIG_ARCH_OMAP1
  94
  95 /* Chain handling macros */
  96 #define OMAP_DMA_CHAIN_QINIT(chain_id)                                  \
  97         do {                                                            \
  98                 dma_linked_lch[chain_id].q_head =                       \
  99                 dma_linked_lch[chain_id].q_tail =                       \
 100                 dma_linked_lch[chain_id].q_count = 0;                   \
 101         } while (0)
 102 #define OMAP_DMA_CHAIN_QFULL(chain_id)                                  \
 103                 (dma_linked_lch[chain_id].no_of_lchs_linked ==          \
 104                 dma_linked_lch[chain_id].q_count)
 105 #define OMAP_DMA_CHAIN_QLAST(chain_id)                                  \
 106         do {                                                            \
 107                 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==      \
 108                 dma_linked_lch[chain_id].q_count)                       \
 109         } while (0)
 110 #define OMAP_DMA_CHAIN_QEMPTY(chain_id)                                 \
 111                 (0 == dma_linked_lch[chain_id].q_count)
 112 #define __OMAP_DMA_CHAIN_INCQ(end)                                      \
 113         ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
 114 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id)                               \
 115         do {                                                            \
 116                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
 117                 dma_linked_lch[chain_id].q_count--;                     \
 118         } while (0)
 119
 120 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id)                               \
 121         do {                                                            \
 122                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
 123                 dma_linked_lch[chain_id].q_count++; \
 124         } while (0)
 125 #endif
 126
 127 static int dma_lch_count;
 128 static int dma_chan_count;
 129 static int omap_dma_reserve_channels;
 130
 131 static spinlock_t dma_chan_lock;
 132 static struct omap_dma_lch *dma_chan;
 133
 134 static inline void disable_lnk(int lch);
 135 static void omap_disable_channel_irq(int lch);
 136 static inline void omap_enable_channel_irq(int lch);
 137
 138 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 139                                                 __func__);
 140
 141 #ifdef CONFIG_ARCH_OMAP15XX
 142 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 143 static int omap_dma_in_1510_mode(void)
 144 {
 145         return enable_1510_mode;
 146 }
 147 #else
 148 #define omap_dma_in_1510_mode()         0
 149 #endif
 150
 151 #ifdef CONFIG_ARCH_OMAP1
 152 static inline int get_gdma_dev(int req)
 153 {
 154         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 155         int shift = ((req - 1) % 5) * 6;
 156
 157         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
 158 }
 159
 160 static inline void set_gdma_dev(int req, int dev)
 161 {
 162         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 163         int shift = ((req - 1) % 5) * 6;
 164         u32 l;
 165
 166         l = omap_readl(reg);
 167         l &= ~(0x3f << shift);
 168         l |= (dev - 1) << shift;
 169         omap_writel(l, reg);
 170 }
 171 #else
 172 #define set_gdma_dev(req, dev)  do {} while (0)
 173 #define omap_readl(reg)         0
 174 #define omap_writel(val, reg)   do {} while (0)
 175 #endif
 176
 177 #ifdef CONFIG_ARCH_OMAP1
 178 void omap_set_dma_priority(int lch, int dst_port, int priority)
 179 {
 180         unsigned long reg;
 181         u32 l;
 182
 183         if (dma_omap1()) {
 184                 switch (dst_port) {
 185                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 186                         reg = OMAP_TC_OCPT1_PRIOR;
 187                         break;
 188                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 189                         reg = OMAP_TC_OCPT2_PRIOR;
 190                         break;
 191                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 192                         reg = OMAP_TC_EMIFF_PRIOR;
 193                         break;
 194                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 195                         reg = OMAP_TC_EMIFS_PRIOR;
 196                         break;
 197                 default:
 198                         BUG();
 199                         return;
 200                 }
 201                 l = omap_readl(reg);
 202                 l &= ~(0xf << 8);
 203                 l |= (priority & 0xf) << 8;
 204                 omap_writel(l, reg);
 205         }
 206 }
 207 #endif
 208
 209 #ifdef CONFIG_ARCH_OMAP2PLUS
 210 void omap_set_dma_priority(int lch, int dst_port, int priority)
 211 {
 212         u32 ccr;
 213
 214         ccr = p->dma_read(CCR, lch);
 215         if (priority)
 216                 ccr |= (1 << 6);
 217         else
 218                 ccr &= ~(1 << 6);
 219         p->dma_write(ccr, CCR, lch);
 220 }
 221 #endif
 222 EXPORT_SYMBOL(omap_set_dma_priority);
 223
 224 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 225                                   int frame_count, int sync_mode,
 226                                   int dma_trigger, int src_or_dst_synch)
 227 {
 228         u32 l;
 229
 230         l = p->dma_read(CSDP, lch);
 231         l &= ~0x03;
 232         l |= data_type;
 233         p->dma_write(l, CSDP, lch);
 234
 235         if (dma_omap1()) {
 236                 u16 ccr;
 237
 238                 ccr = p->dma_read(CCR, lch);
 239                 ccr &= ~(1 << 5);
 240                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 241                         ccr |= 1 << 5;
 242                 p->dma_write(ccr, CCR, lch);
 243
 244                 ccr = p->dma_read(CCR2, lch);
 245                 ccr &= ~(1 << 2);
 246                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 247                         ccr |= 1 << 2;
 248                 p->dma_write(ccr, CCR2, lch);
 249         }
 250
 251         if (dma_omap2plus() && dma_trigger) {
 252                 u32 val;
 253
 254                 val = p->dma_read(CCR, lch);
 255
 256                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 257                 val &= ~((1 << 23) | (3 << 19) | 0x1f);
 258                 val |= (dma_trigger & ~0x1f) << 14;
 259                 val |= dma_trigger & 0x1f;
 260
 261                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 262                         val |= 1 << 5;
 263                 else
 264                         val &= ~(1 << 5);
 265
 266                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 267                         val |= 1 << 18;
 268                 else
 269                         val &= ~(1 << 18);
 270
 271                 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
 272                         val &= ~(1 << 24);      /* dest synch */
 273                         val |= (1 << 23);       /* Prefetch */
 274                 } else if (src_or_dst_synch) {
 275                         val |= 1 << 24;         /* source synch */
 276                 } else {
 277                         val &= ~(1 << 24);      /* dest synch */
 278                 }
 279                 p->dma_write(val, CCR, lch);
 280         }
 281
 282         p->dma_write(elem_count, CEN, lch);
 283         p->dma_write(frame_count, CFN, lch);
 284 }
 285 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 286
 287 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 288 {
 289         BUG_ON(omap_dma_in_1510_mode());
 290
 291         if (dma_omap1()) {
 292                 u16 w;
 293
 294                 w = p->dma_read(CCR2, lch);
 295                 w &= ~0x03;
 296
 297                 switch (mode) {
 298                 case OMAP_DMA_CONSTANT_FILL:
 299                         w |= 0x01;
 300                         break;
 301                 case OMAP_DMA_TRANSPARENT_COPY:
 302                         w |= 0x02;
 303                         break;
 304                 case OMAP_DMA_COLOR_DIS:
 305                         break;
 306                 default:
 307                         BUG();
 308                 }
 309                 p->dma_write(w, CCR2, lch);
 310
 311                 w = p->dma_read(LCH_CTRL, lch);
 312                 w &= ~0x0f;
 313                 /* Default is channel type 2D */
 314                 if (mode) {
 315                         p->dma_write(color, COLOR, lch);
 316                         w |= 1;         /* Channel type G */
 317                 }
 318                 p->dma_write(w, LCH_CTRL, lch);
 319         }
 320
 321         if (dma_omap2plus()) {
 322                 u32 val;
 323
 324                 val = p->dma_read(CCR, lch);
 325                 val &= ~((1 << 17) | (1 << 16));
 326
 327                 switch (mode) {
 328                 case OMAP_DMA_CONSTANT_FILL:
 329                         val |= 1 << 16;
 330                         break;
 331                 case OMAP_DMA_TRANSPARENT_COPY:
 332                         val |= 1 << 17;
 333                         break;
 334                 case OMAP_DMA_COLOR_DIS:
 335                         break;
 336                 default:
 337                         BUG();
 338                 }
 339                 p->dma_write(val, CCR, lch);
 340
 341                 color &= 0xffffff;
 342                 p->dma_write(color, COLOR, lch);
 343         }
 344 }
 345 EXPORT_SYMBOL(omap_set_dma_color_mode);
 346
 347 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 348 {
 349         if (dma_omap2plus()) {
 350                 u32 csdp;
 351
 352                 csdp = p->dma_read(CSDP, lch);
 353                 csdp &= ~(0x3 << 16);
 354                 csdp |= (mode << 16);
 355                 p->dma_write(csdp, CSDP, lch);
 356         }
 357 }
 358 EXPORT_SYMBOL(omap_set_dma_write_mode);
 359
 360 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 361 {
 362         if (dma_omap1() && !dma_omap15xx()) {
 363                 u32 l;
 364
 365                 l = p->dma_read(LCH_CTRL, lch);
 366                 l &= ~0x7;
 367                 l |= mode;
 368                 p->dma_write(l, LCH_CTRL, lch);
 369         }
 370 }
 371 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 372
 373 /* Note that src_port is only for omap1 */
 374 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 375                              unsigned long src_start,
 376                              int src_ei, int src_fi)
 377 {
 378         u32 l;
 379
 380         if (dma_omap1()) {
 381                 u16 w;
 382
 383                 w = p->dma_read(CSDP, lch);
 384                 w &= ~(0x1f << 2);
 385                 w |= src_port << 2;
 386                 p->dma_write(w, CSDP, lch);
 387         }
 388
 389         l = p->dma_read(CCR, lch);
 390         l &= ~(0x03 << 12);
 391         l |= src_amode << 12;
 392         p->dma_write(l, CCR, lch);
 393
 394         p->dma_write(src_start, CSSA, lch);
 395
 396         p->dma_write(src_ei, CSEI, lch);
 397         p->dma_write(src_fi, CSFI, lch);
 398 }
 399 EXPORT_SYMBOL(omap_set_dma_src_params);
 400
 401 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 402 {
 403         omap_set_dma_transfer_params(lch, params->data_type,
 404                                      params->elem_count, params->frame_count,
 405                                      params->sync_mode, params->trigger,
 406                                      params->src_or_dst_synch);
 407         omap_set_dma_src_params(lch, params->src_port,
 408                                 params->src_amode, params->src_start,
 409                                 params->src_ei, params->src_fi);
 410
 411         omap_set_dma_dest_params(lch, params->dst_port,
 412                                  params->dst_amode, params->dst_start,
 413                                  params->dst_ei, params->dst_fi);
 414         if (params->read_prio || params->write_prio)
 415                 omap_dma_set_prio_lch(lch, params->read_prio,
 416                                       params->write_prio);
 417 }
 418 EXPORT_SYMBOL(omap_set_dma_params);
 419
 420 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 421 {
 422         if (dma_omap2plus())
 423                 return;
 424
 425         p->dma_write(eidx, CSEI, lch);
 426         p->dma_write(fidx, CSFI, lch);
 427 }
 428 EXPORT_SYMBOL(omap_set_dma_src_index);
 429
 430 void omap_set_dma_src_data_pack(int lch, int enable)
 431 {
 432         u32 l;
 433
 434         l = p->dma_read(CSDP, lch);
 435         l &= ~(1 << 6);
 436         if (enable)
 437                 l |= (1 << 6);
 438         p->dma_write(l, CSDP, lch);
 439 }
 440 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 441
 442 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 443 {
 444         unsigned int burst = 0;
 445         u32 l;
 446
 447         l = p->dma_read(CSDP, lch);
 448         l &= ~(0x03 << 7);
 449
 450         switch (burst_mode) {
 451         case OMAP_DMA_DATA_BURST_DIS:
 452                 break;
 453         case OMAP_DMA_DATA_BURST_4:
 454                 if (dma_omap2plus())
 455                         burst = 0x1;
 456                 else
 457                         burst = 0x2;
 458                 break;
 459         case OMAP_DMA_DATA_BURST_8:
 460                 if (dma_omap2plus()) {
 461                         burst = 0x2;
 462                         break;
 463                 }
 464                 /*
 465                  * not supported by current hardware on OMAP1
 466                  * w |= (0x03 << 7);
 467                  * fall through
 468                  */
 469         case OMAP_DMA_DATA_BURST_16:
 470                 if (dma_omap2plus()) {
 471                         burst = 0x3;
 472                         break;
 473                 }
 474                 /*
 475                  * OMAP1 don't support burst 16
 476                  * fall through
 477                  */
 478         default:
 479                 BUG();
 480         }
 481
 482         l |= (burst << 7);
 483         p->dma_write(l, CSDP, lch);
 484 }
 485 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 486
 487 /* Note that dest_port is only for OMAP1 */
 488 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 489                               unsigned long dest_start,
 490                               int dst_ei, int dst_fi)
 491 {
 492         u32 l;
 493
 494         if (dma_omap1()) {
 495                 l = p->dma_read(CSDP, lch);
 496                 l &= ~(0x1f << 9);
 497                 l |= dest_port << 9;
 498                 p->dma_write(l, CSDP, lch);
 499         }
 500
 501         l = p->dma_read(CCR, lch);
 502         l &= ~(0x03 << 14);
 503         l |= dest_amode << 14;
 504         p->dma_write(l, CCR, lch);
 505
 506         p->dma_write(dest_start, CDSA, lch);
 507
 508         p->dma_write(dst_ei, CDEI, lch);
 509         p->dma_write(dst_fi, CDFI, lch);
 510 }
 511 EXPORT_SYMBOL(omap_set_dma_dest_params);
 512
 513 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 514 {
 515         if (dma_omap2plus())
 516                 return;
 517
 518         p->dma_write(eidx, CDEI, lch);
 519         p->dma_write(fidx, CDFI, lch);
 520 }
 521 EXPORT_SYMBOL(omap_set_dma_dest_index);
 522
 523 void omap_set_dma_dest_data_pack(int lch, int enable)
 524 {
 525         u32 l;
 526
 527         l = p->dma_read(CSDP, lch);
 528         l &= ~(1 << 13);
 529         if (enable)
 530                 l |= 1 << 13;
 531         p->dma_write(l, CSDP, lch);
 532 }
 533 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 534
 535 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 536 {
 537         unsigned int burst = 0;
 538         u32 l;
 539
 540         l = p->dma_read(CSDP, lch);
 541         l &= ~(0x03 << 14);
 542
 543         switch (burst_mode) {
 544         case OMAP_DMA_DATA_BURST_DIS:
 545                 break;
 546         case OMAP_DMA_DATA_BURST_4:
 547                 if (dma_omap2plus())
 548                         burst = 0x1;
 549                 else
 550                         burst = 0x2;
 551                 break;
 552         case OMAP_DMA_DATA_BURST_8:
 553                 if (dma_omap2plus())
 554                         burst = 0x2;
 555                 else
 556                         burst = 0x3;
 557                 break;
 558         case OMAP_DMA_DATA_BURST_16:
 559                 if (dma_omap2plus()) {
 560                         burst = 0x3;
 561                         break;
 562                 }
 563                 /*
 564                  * OMAP1 don't support burst 16
 565                  * fall through
 566                  */
 567         default:
 568                 printk(KERN_ERR "Invalid DMA burst mode\n");
 569                 BUG();
 570                 return;
 571         }
 572         l |= (burst << 14);
 573         p->dma_write(l, CSDP, lch);
 574 }
 575 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 576
 577 static inline void omap_enable_channel_irq(int lch)
 578 {
 579         /* Clear CSR */
 580         if (dma_omap1())
 581                 p->dma_read(CSR, lch);
 582         else
 583                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 584
 585         /* Enable some nice interrupts. */
 586         p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
 587 }
 588
 589 static inline void omap_disable_channel_irq(int lch)
 590 {
 591         /* disable channel interrupts */
 592         p->dma_write(0, CICR, lch);
 593         /* Clear CSR */
 594         if (dma_omap1())
 595                 p->dma_read(CSR, lch);
 596         else
 597                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 598 }
 599
 600 void omap_enable_dma_irq(int lch, u16 bits)
 601 {
 602         dma_chan[lch].enabled_irqs |= bits;
 603 }
 604 EXPORT_SYMBOL(omap_enable_dma_irq);
 605
 606 void omap_disable_dma_irq(int lch, u16 bits)
 607 {
 608         dma_chan[lch].enabled_irqs &= ~bits;
 609 }
 610 EXPORT_SYMBOL(omap_disable_dma_irq);
 611
 612 static inline void enable_lnk(int lch)
 613 {
 614         u32 l;
 615
 616         l = p->dma_read(CLNK_CTRL, lch);
 617
 618         if (dma_omap1())
 619                 l &= ~(1 << 14);
 620
 621         /* Set the ENABLE_LNK bits */
 622         if (dma_chan[lch].next_lch != -1)
 623                 l = dma_chan[lch].next_lch | (1 << 15);
 624
 625 #ifndef CONFIG_ARCH_OMAP1
 626         if (dma_omap2plus())
 627                 if (dma_chan[lch].next_linked_ch != -1)
 628                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 629 #endif
 630
 631         p->dma_write(l, CLNK_CTRL, lch);
 632 }
 633
 634 static inline void disable_lnk(int lch)
 635 {
 636         u32 l;
 637
 638         l = p->dma_read(CLNK_CTRL, lch);
 639
 640         /* Disable interrupts */
 641         omap_disable_channel_irq(lch);
 642
 643         if (dma_omap1()) {
 644                 /* Set the STOP_LNK bit */
 645                 l |= 1 << 14;
 646         }
 647
 648         if (dma_omap2plus()) {
 649                 /* Clear the ENABLE_LNK bit */
 650                 l &= ~(1 << 15);
 651         }
 652
 653         p->dma_write(l, CLNK_CTRL, lch);
 654         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 655 }
 656
 657 static inline void omap2_enable_irq_lch(int lch)
 658 {
 659         u32 val;
 660         unsigned long flags;
 661
 662         if (dma_omap1())
 663                 return;
 664
 665         spin_lock_irqsave(&dma_chan_lock, flags);
 666         /* clear IRQ STATUS */
 667         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 668         /* Enable interrupt */
 669         val = p->dma_read(IRQENABLE_L0, lch);
 670         val |= 1 << lch;
 671         p->dma_write(val, IRQENABLE_L0, lch);
 672         spin_unlock_irqrestore(&dma_chan_lock, flags);
 673 }
 674
 675 static inline void omap2_disable_irq_lch(int lch)
 676 {
 677         u32 val;
 678         unsigned long flags;
 679
 680         if (dma_omap1())
 681                 return;
 682
 683         spin_lock_irqsave(&dma_chan_lock, flags);
 684         /* Disable interrupt */
 685         val = p->dma_read(IRQENABLE_L0, lch);
 686         val &= ~(1 << lch);
 687         p->dma_write(val, IRQENABLE_L0, lch);
 688         /* clear IRQ STATUS */
 689         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 690         spin_unlock_irqrestore(&dma_chan_lock, flags);
 691 }
 692
 693 int omap_request_dma(int dev_id, const char *dev_name,
 694                      void (*callback)(int lch, u16 ch_status, void *data),
 695                      void *data, int *dma_ch_out)
 696 {
 697         int ch, free_ch = -1;
 698         unsigned long flags;
 699         struct omap_dma_lch *chan;
 700
 701         spin_lock_irqsave(&dma_chan_lock, flags);
 702         for (ch = 0; ch < dma_chan_count; ch++) {
 703                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 704                         free_ch = ch;
 705                         /* Exit after first free channel found */
 706                         break;
 707                 }
 708         }
 709         if (free_ch == -1) {
 710                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 711                 return -EBUSY;
 712         }
 713         chan = dma_chan + free_ch;
 714         chan->dev_id = dev_id;
 715
 716         if (p->clear_lch_regs)
 717                 p->clear_lch_regs(free_ch);
 718
 719         if (dma_omap2plus())
 720                 omap_clear_dma(free_ch);
 721
 722         spin_unlock_irqrestore(&dma_chan_lock, flags);
 723
 724         chan->dev_name = dev_name;
 725         chan->callback = callback;
 726         chan->data = data;
 727         chan->flags = 0;
 728
 729 #ifndef CONFIG_ARCH_OMAP1
 730         if (dma_omap2plus()) {
 731                 chan->chain_id = -1;
 732                 chan->next_linked_ch = -1;
 733         }
 734 #endif
 735
 736         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 737
 738         if (dma_omap1())
 739                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 740         else if (dma_omap2plus())
 741                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 742                         OMAP2_DMA_TRANS_ERR_IRQ;
 743
 744         if (dma_omap16xx()) {
 745                 /* If the sync device is set, configure it dynamically. */
 746                 if (dev_id != 0) {
 747                         set_gdma_dev(free_ch + 1, dev_id);
 748                         dev_id = free_ch + 1;
 749                 }
 750                 /*
 751                  * Disable the 1510 compatibility mode and set the sync device
 752                  * id.
 753                  */
 754                 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
 755         } else if (dma_omap1()) {
 756                 p->dma_write(dev_id, CCR, free_ch);
 757         }
 758
 759         if (dma_omap2plus()) {
 760                 omap_enable_channel_irq(free_ch);
 761                 omap2_enable_irq_lch(free_ch);
 762         }
 763
 764         *dma_ch_out = free_ch;
 765
 766         return 0;
 767 }
 768 EXPORT_SYMBOL(omap_request_dma);
 769
 770 void omap_free_dma(int lch)
 771 {
 772         unsigned long flags;
 773
 774         if (dma_chan[lch].dev_id == -1) {
 775                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 776                        lch);
 777                 return;
 778         }
 779
 780         /* Disable interrupt for logical channel */
 781         if (dma_omap2plus())
 782                 omap2_disable_irq_lch(lch);
 783
 784         /* Disable all DMA interrupts for the channel. */
 785         omap_disable_channel_irq(lch);
 786
 787         /* Make sure the DMA transfer is stopped. */
 788         p->dma_write(0, CCR, lch);
 789
 790         /* Clear registers */
 791         if (dma_omap2plus())
 792                 omap_clear_dma(lch);
 793
 794         spin_lock_irqsave(&dma_chan_lock, flags);
 795         dma_chan[lch].dev_id = -1;
 796         dma_chan[lch].next_lch = -1;
 797         dma_chan[lch].callback = NULL;
 798         spin_unlock_irqrestore(&dma_chan_lock, flags);
 799 }
 800 EXPORT_SYMBOL(omap_free_dma);
 801
 802 /**
 803  * @brief omap_dma_set_global_params : Set global priority settings for dma
 804  *
 805  * @param arb_rate
 806  * @param max_fifo_depth
 807  * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
 808  *                                                 DMA_THREAD_RESERVE_ONET
 809  *                                                 DMA_THREAD_RESERVE_TWOT
 810  *                                                 DMA_THREAD_RESERVE_THREET
 811  */
 812 void
 813 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 814 {
 815         u32 reg;
 816
 817         if (dma_omap1()) {
 818                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 819                 return;
 820         }
 821
 822         if (max_fifo_depth == 0)
 823                 max_fifo_depth = 1;
 824         if (arb_rate == 0)
 825                 arb_rate = 1;
 826
 827         reg = 0xff & max_fifo_depth;
 828         reg |= (0x3 & tparams) << 12;
 829         reg |= (arb_rate & 0xff) << 16;
 830
 831         p->dma_write(reg, GCR, 0);
 832 }
 833 EXPORT_SYMBOL(omap_dma_set_global_params);
 834
 835 /**
 836  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 837  *
 838  * @param lch
 839  * @param read_prio - Read priority
 840  * @param write_prio - Write priority
 841  * Both of the above can be set with one of the following values :
 842  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 843  */
 844 int
 845 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 846                       unsigned char write_prio)
 847 {
 848         u32 l;
 849
 850         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 851                 printk(KERN_ERR "Invalid channel id\n");
 852                 return -EINVAL;
 853         }
 854         l = p->dma_read(CCR, lch);
 855         l &= ~((1 << 6) | (1 << 26));
 856         if (d->dev_caps & IS_RW_PRIORITY)
 857                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 858         else
 859                 l |= ((read_prio & 0x1) << 6);
 860
 861         p->dma_write(l, CCR, lch);
 862
 863         return 0;
 864 }
 865 EXPORT_SYMBOL(omap_dma_set_prio_lch);
 866
 867 /*
 868  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 869  * through omap_start_dma(). Any buffers in flight are discarded.
 870  */
 871 void omap_clear_dma(int lch)
 872 {
 873         unsigned long flags;
 874
 875         local_irq_save(flags);
 876         p->clear_dma(lch);
 877         local_irq_restore(flags);
 878 }
 879 EXPORT_SYMBOL(omap_clear_dma);
 880
 881 void omap_start_dma(int lch)
 882 {
 883         u32 l;
 884
 885         /*
 886          * The CPC/CDAC register needs to be initialized to zero
 887          * before starting dma transfer.
 888          */
 889         if (dma_omap15xx())
 890                 p->dma_write(0, CPC, lch);
 891         else
 892                 p->dma_write(0, CDAC, lch);
 893
 894         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 895                 int next_lch, cur_lch;
 896                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 897
 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                 dma_chan_link_map[lch] = 1;
 903
 904                 cur_lch = dma_chan[lch].next_lch;
 905                 do {
 906                         next_lch = dma_chan[cur_lch].next_lch;
 907
 908                         /* The loop case: we've been here already */
 909                         if (dma_chan_link_map[cur_lch])
 910                                 break;
 911                         /* Mark the current channel */
 912                         dma_chan_link_map[cur_lch] = 1;
 913
 914                         enable_lnk(cur_lch);
 915                         omap_enable_channel_irq(cur_lch);
 916
 917                         cur_lch = next_lch;
 918                 } while (next_lch != -1);
 919         } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
 920                 p->dma_write(lch, CLNK_CTRL, lch);
 921
 922         omap_enable_channel_irq(lch);
 923
 924         l = p->dma_read(CCR, lch);
 925
 926         if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
 927                         l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
 928         l |= OMAP_DMA_CCR_EN;
 929
 930         /*
 931          * As dma_write() uses IO accessors which are weakly ordered, there
 932          * is no guarantee that data in coherent DMA memory will be visible
 933          * to the DMA device.  Add a memory barrier here to ensure that any
 934          * such data is visible prior to enabling DMA.
 935          */
 936         mb();
 937         p->dma_write(l, CCR, lch);
 938
 939         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 940 }
 941 EXPORT_SYMBOL(omap_start_dma);
 942
 943 void omap_stop_dma(int lch)
 944 {
 945         u32 l;
 946
 947         /* Disable all interrupts on the channel */
 948         omap_disable_channel_irq(lch);
 949
 950         l = p->dma_read(CCR, lch);
 951         if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
 952                         (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
 953                 int i = 0;
 954                 u32 sys_cf;
 955
 956                 /* Configure No-Standby */
 957                 l = p->dma_read(OCP_SYSCONFIG, lch);
 958                 sys_cf = l;
 959                 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
 960                 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
 961                 p->dma_write(l , OCP_SYSCONFIG, 0);
 962
 963                 l = p->dma_read(CCR, lch);
 964                 l &= ~OMAP_DMA_CCR_EN;
 965                 p->dma_write(l, CCR, lch);
 966
 967                 /* Wait for sDMA FIFO drain */
 968                 l = p->dma_read(CCR, lch);
 969                 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
 970                                         OMAP_DMA_CCR_WR_ACTIVE))) {
 971                         udelay(5);
 972                         i++;
 973                         l = p->dma_read(CCR, lch);
 974                 }
 975                 if (i >= 100)
 976                         pr_err("DMA drain did not complete on lch %d\n", lch);
 977                 /* Restore OCP_SYSCONFIG */
 978                 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
 979         } else {
 980                 l &= ~OMAP_DMA_CCR_EN;
 981                 p->dma_write(l, CCR, lch);
 982         }
 983
 984         /*
 985          * Ensure that data transferred by DMA is visible to any access
 986          * after DMA has been disabled.  This is important for coherent
 987          * DMA regions.
 988          */
 989         mb();
 990
 991         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 992                 int next_lch, cur_lch = lch;
 993                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 994
 995                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 996                 do {
 997                         /* The loop case: we've been here already */
 998                         if (dma_chan_link_map[cur_lch])
 999                                 break;
1000                         /* Mark the current channel */
1001                         dma_chan_link_map[cur_lch] = 1;
1002
1003                         disable_lnk(cur_lch);
1004
1005                         next_lch = dma_chan[cur_lch].next_lch;
1006                         cur_lch = next_lch;
1007                 } while (next_lch != -1);
1008         }
1009
1010         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
1011 }
1012 EXPORT_SYMBOL(omap_stop_dma);
1013
1014 /*
1015  * Allows changing the DMA callback function or data. This may be needed if
1016  * the driver shares a single DMA channel for multiple dma triggers.
1017  */
1018 int omap_set_dma_callback(int lch,
1019                           void (*callback)(int lch, u16 ch_status, void *data),
1020                           void *data)
1021 {
1022         unsigned long flags;
1023
1024         if (lch < 0)
1025                 return -ENODEV;
1026
1027         spin_lock_irqsave(&dma_chan_lock, flags);
1028         if (dma_chan[lch].dev_id == -1) {
1029                 printk(KERN_ERR "DMA callback for not set for free channel\n");
1030                 spin_unlock_irqrestore(&dma_chan_lock, flags);
1031                 return -EINVAL;
1032         }
1033         dma_chan[lch].callback = callback;
1034         dma_chan[lch].data = data;
1035         spin_unlock_irqrestore(&dma_chan_lock, flags);
1036
1037         return 0;
1038 }
1039 EXPORT_SYMBOL(omap_set_dma_callback);
1040
1041 /*
1042  * Returns current physical source address for the given DMA channel.
1043  * If the channel is running the caller must disable interrupts prior calling
1044  * this function and process the returned value before re-enabling interrupt to
1045  * prevent races with the interrupt handler. Note that in continuous mode there
1046  * is a chance for CSSA_L register overflow between the two reads resulting
1047  * in incorrect return value.
1048  */
1049 dma_addr_t omap_get_dma_src_pos(int lch)
1050 {
1051         dma_addr_t offset = 0;
1052
1053         if (dma_omap15xx())
1054                 offset = p->dma_read(CPC, lch);
1055         else
1056                 offset = p->dma_read(CSAC, lch);
1057
1058         if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
1059                 offset = p->dma_read(CSAC, lch);
1060
1061         if (!dma_omap15xx()) {
1062                 /*
1063                  * CDAC == 0 indicates that the DMA transfer on the channel has
1064                  * not been started (no data has been transferred so far).
1065                  * Return the programmed source start address in this case.
1066                  */
1067                 if (likely(p->dma_read(CDAC, lch)))
1068                         offset = p->dma_read(CSAC, lch);
1069                 else
1070                         offset = p->dma_read(CSSA, lch);
1071         }
1072
1073         if (dma_omap1())
1074                 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
1075
1076         return offset;
1077 }
1078 EXPORT_SYMBOL(omap_get_dma_src_pos);
1079
1080 /*
1081  * Returns current physical destination address for the given DMA channel.
1082  * If the channel is running the caller must disable interrupts prior calling
1083  * this function and process the returned value before re-enabling interrupt to
1084  * prevent races with the interrupt handler. Note that in continuous mode there
1085  * is a chance for CDSA_L register overflow between the two reads resulting
1086  * in incorrect return value.
1087  */
1088 dma_addr_t omap_get_dma_dst_pos(int lch)
1089 {
1090         dma_addr_t offset = 0;
1091
1092         if (dma_omap15xx())
1093                 offset = p->dma_read(CPC, lch);
1094         else
1095                 offset = p->dma_read(CDAC, lch);
1096
1097         /*
1098          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1099          * read before the DMA controller finished disabling the channel.
1100          */
1101         if (!dma_omap15xx() && offset == 0) {
1102                 offset = p->dma_read(CDAC, lch);
1103                 /*
1104                  * CDAC == 0 indicates that the DMA transfer on the channel has
1105                  * not been started (no data has been transferred so far).
1106                  * Return the programmed destination start address in this case.
1107                  */
1108                 if (unlikely(!offset))
1109                         offset = p->dma_read(CDSA, lch);
1110         }
1111
1112         if (dma_omap1())
1113                 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1114
1115         return offset;
1116 }
1117 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1118
1119 int omap_get_dma_active_status(int lch)
1120 {
1121         return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1122 }
1123 EXPORT_SYMBOL(omap_get_dma_active_status);
1124
1125 int omap_dma_running(void)
1126 {
1127         int lch;
1128
1129         if (dma_omap1())
1130                 if (omap_lcd_dma_running())
1131                         return 1;
1132
1133         for (lch = 0; lch < dma_chan_count; lch++)
1134                 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1135                         return 1;
1136
1137         return 0;
1138 }
1139
1140 /*
1141  * lch_queue DMA will start right after lch_head one is finished.
1142  * For this DMA link to start, you still need to start (see omap_start_dma)
1143  * the first one. That will fire up the entire queue.
1144  */
1145 void omap_dma_link_lch(int lch_head, int lch_queue)
1146 {
1147         if (omap_dma_in_1510_mode()) {
1148                 if (lch_head == lch_queue) {
1149                         p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1150                                                                 CCR, lch_head);
1151                         return;
1152                 }
1153                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1154                 BUG();
1155                 return;
1156         }
1157
1158         if ((dma_chan[lch_head].dev_id == -1) ||
1159             (dma_chan[lch_queue].dev_id == -1)) {
1160                 pr_err("omap_dma: trying to link non requested channels\n");
1161                 dump_stack();
1162         }
1163
1164         dma_chan[lch_head].next_lch = lch_queue;
1165 }
1166 EXPORT_SYMBOL(omap_dma_link_lch);
1167
1168 /*
1169  * Once the DMA queue is stopped, we can destroy it.
1170  */
1171 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1172 {
1173         if (omap_dma_in_1510_mode()) {
1174                 if (lch_head == lch_queue) {
1175                         p->dma_write(p->dma_read(CCR, lch_head) & ~(3 << 8),
1176                                                                 CCR, lch_head);
1177                         return;
1178                 }
1179                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1180                 BUG();
1181                 return;
1182         }
1183
1184         if (dma_chan[lch_head].next_lch != lch_queue ||
1185             dma_chan[lch_head].next_lch == -1) {
1186                 pr_err("omap_dma: trying to unlink non linked channels\n");
1187                 dump_stack();
1188         }
1189
1190         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1191             (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1192                 pr_err("omap_dma: You need to stop the DMA channels before unlinking\n");
1193                 dump_stack();
1194         }
1195
1196         dma_chan[lch_head].next_lch = -1;
1197 }
1198 EXPORT_SYMBOL(omap_dma_unlink_lch);
1199
1200 #ifndef CONFIG_ARCH_OMAP1
1201 /* Create chain of DMA channesls */
1202 static void create_dma_lch_chain(int lch_head, int lch_queue)
1203 {
1204         u32 l;
1205
1206         /* Check if this is the first link in chain */
1207         if (dma_chan[lch_head].next_linked_ch == -1) {
1208                 dma_chan[lch_head].next_linked_ch = lch_queue;
1209                 dma_chan[lch_head].prev_linked_ch = lch_queue;
1210                 dma_chan[lch_queue].next_linked_ch = lch_head;
1211                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1212         }
1213
1214         /* a link exists, link the new channel in circular chain */
1215         else {
1216                 dma_chan[lch_queue].next_linked_ch =
1217                                         dma_chan[lch_head].next_linked_ch;
1218                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1219                 dma_chan[lch_head].next_linked_ch = lch_queue;
1220                 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1221                                         lch_queue;
1222         }
1223
1224         l = p->dma_read(CLNK_CTRL, lch_head);
1225         l &= ~(0x1f);
1226         l |= lch_queue;
1227         p->dma_write(l, CLNK_CTRL, lch_head);
1228
1229         l = p->dma_read(CLNK_CTRL, lch_queue);
1230         l &= ~(0x1f);
1231         l |= (dma_chan[lch_queue].next_linked_ch);
1232         p->dma_write(l, CLNK_CTRL, lch_queue);
1233 }
1234
1235 /**
1236  * @brief omap_request_dma_chain : Request a chain of DMA channels
1237  *
1238  * @param dev_id - Device id using the dma channel
1239  * @param dev_name - Device name
1240  * @param callback - Call back function
1241  * @chain_id -
1242  * @no_of_chans - Number of channels requested
1243  * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1244  *                                            OMAP_DMA_DYNAMIC_CHAIN
1245  * @params - Channel parameters
1246  *
1247  * @return - Success : 0
1248  *           Failure: -EINVAL/-ENOMEM
1249  */
1250 int omap_request_dma_chain(int dev_id, const char *dev_name,
1251                            void (*callback) (int lch, u16 ch_status,
1252                                              void *data),
1253                            int *chain_id, int no_of_chans, int chain_mode,
1254                            struct omap_dma_channel_params params)
1255 {
1256         int *channels;
1257         int i, err;
1258
1259         /* Is the chain mode valid ? */
1260         if (chain_mode != OMAP_DMA_STATIC_CHAIN
1261                         && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1262                 printk(KERN_ERR "Invalid chain mode requested\n");
1263                 return -EINVAL;
1264         }
1265
1266         if (unlikely((no_of_chans < 1
1267                         || no_of_chans > dma_lch_count))) {
1268                 printk(KERN_ERR "Invalid Number of channels requested\n");
1269                 return -EINVAL;
1270         }
1271
1272         /*
1273          * Allocate a queue to maintain the status of the channels
1274          * in the chain
1275          */
1276         channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1277         if (channels == NULL) {
1278                 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1279                 return -ENOMEM;
1280         }
1281
1282         /* request and reserve DMA channels for the chain */
1283         for (i = 0; i < no_of_chans; i++) {
1284                 err = omap_request_dma(dev_id, dev_name,
1285                                         callback, NULL, &channels[i]);
1286                 if (err < 0) {
1287                         int j;
1288                         for (j = 0; j < i; j++)
1289                                 omap_free_dma(channels[j]);
1290                         kfree(channels);
1291                         printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1292                         return err;
1293                 }
1294                 dma_chan[channels[i]].prev_linked_ch = -1;
1295                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1296
1297                 /*
1298                  * Allowing client drivers to set common parameters now,
1299                  * so that later only relevant (src_start, dest_start
1300                  * and element count) can be set
1301                  */
1302                 omap_set_dma_params(channels[i], &params);
1303         }
1304
1305         *chain_id = channels[0];
1306         dma_linked_lch[*chain_id].linked_dmach_q = channels;
1307         dma_linked_lch[*chain_id].chain_mode = chain_mode;
1308         dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1309         dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1310
1311         for (i = 0; i < no_of_chans; i++)
1312                 dma_chan[channels[i]].chain_id = *chain_id;
1313
1314         /* Reset the Queue pointers */
1315         OMAP_DMA_CHAIN_QINIT(*chain_id);
1316
1317         /* Set up the chain */
1318         if (no_of_chans == 1)
1319                 create_dma_lch_chain(channels[0], channels[0]);
1320         else {
1321                 for (i = 0; i < (no_of_chans - 1); i++)
1322                         create_dma_lch_chain(channels[i], channels[i + 1]);
1323         }
1324
1325         return 0;
1326 }
1327 EXPORT_SYMBOL(omap_request_dma_chain);
1328
1329 /**
1330  * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1331  * params after setting it. Dont do this while dma is running!!
1332  *
1333  * @param chain_id - Chained logical channel id.
1334  * @param params
1335  *
1336  * @return - Success : 0
1337  *           Failure : -EINVAL
1338  */
1339 int omap_modify_dma_chain_params(int chain_id,
1340                                 struct omap_dma_channel_params params)
1341 {
1342         int *channels;
1343         u32 i;
1344
1345         /* Check for input params */
1346         if (unlikely((chain_id < 0
1347                         || chain_id >= dma_lch_count))) {
1348                 printk(KERN_ERR "Invalid chain id\n");
1349                 return -EINVAL;
1350         }
1351
1352         /* Check if the chain exists */
1353         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1354                 printk(KERN_ERR "Chain doesn't exists\n");
1355                 return -EINVAL;
1356         }
1357         channels = dma_linked_lch[chain_id].linked_dmach_q;
1358
1359         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1360                 /*
1361                  * Allowing client drivers to set common parameters now,
1362                  * so that later only relevant (src_start, dest_start
1363                  * and element count) can be set
1364                  */
1365                 omap_set_dma_params(channels[i], &params);
1366         }
1367
1368         return 0;
1369 }
1370 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1371
1372 /**
1373  * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1374  *
1375  * @param chain_id
1376  *
1377  * @return - Success : 0
1378  *           Failure : -EINVAL
1379  */
1380 int omap_free_dma_chain(int chain_id)
1381 {
1382         int *channels;
1383         u32 i;
1384
1385         /* Check for input params */
1386         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1387                 printk(KERN_ERR "Invalid chain id\n");
1388                 return -EINVAL;
1389         }
1390
1391         /* Check if the chain exists */
1392         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1393                 printk(KERN_ERR "Chain doesn't exists\n");
1394                 return -EINVAL;
1395         }
1396
1397         channels = dma_linked_lch[chain_id].linked_dmach_q;
1398         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1399                 dma_chan[channels[i]].next_linked_ch = -1;
1400                 dma_chan[channels[i]].prev_linked_ch = -1;
1401                 dma_chan[channels[i]].chain_id = -1;
1402                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1403                 omap_free_dma(channels[i]);
1404         }
1405
1406         kfree(channels);
1407
1408         dma_linked_lch[chain_id].linked_dmach_q = NULL;
1409         dma_linked_lch[chain_id].chain_mode = -1;
1410         dma_linked_lch[chain_id].chain_state = -1;
1411
1412         return (0);
1413 }
1414 EXPORT_SYMBOL(omap_free_dma_chain);
1415
1416 /**
1417  * @brief omap_dma_chain_status - Check if the chain is in
1418  * active / inactive state.
1419  * @param chain_id
1420  *
1421  * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1422  *           Failure : -EINVAL
1423  */
1424 int omap_dma_chain_status(int chain_id)
1425 {
1426         /* Check for input params */
1427         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1428                 printk(KERN_ERR "Invalid chain id\n");
1429                 return -EINVAL;
1430         }
1431
1432         /* Check if the chain exists */
1433         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1434                 printk(KERN_ERR "Chain doesn't exists\n");
1435                 return -EINVAL;
1436         }
1437         pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1438                         dma_linked_lch[chain_id].q_count);
1439
1440         if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1441                 return OMAP_DMA_CHAIN_INACTIVE;
1442
1443         return OMAP_DMA_CHAIN_ACTIVE;
1444 }
1445 EXPORT_SYMBOL(omap_dma_chain_status);
1446
1447 /**
1448  * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1449  * set the params and start the transfer.
1450  *
1451  * @param chain_id
1452  * @param src_start - buffer start address
1453  * @param dest_start - Dest address
1454  * @param elem_count
1455  * @param frame_count
1456  * @param callbk_data - channel callback parameter data.
1457  *
1458  * @return  - Success : 0
1459  *            Failure: -EINVAL/-EBUSY
1460  */
1461 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1462                         int elem_count, int frame_count, void *callbk_data)
1463 {
1464         int *channels;
1465         u32 l, lch;
1466         int start_dma = 0;
1467
1468         /*
1469          * if buffer size is less than 1 then there is
1470          * no use of starting the chain
1471          */
1472         if (elem_count < 1) {
1473                 printk(KERN_ERR "Invalid buffer size\n");
1474                 return -EINVAL;
1475         }
1476
1477         /* Check for input params */
1478         if (unlikely((chain_id < 0
1479                         || chain_id >= dma_lch_count))) {
1480                 printk(KERN_ERR "Invalid chain id\n");
1481                 return -EINVAL;
1482         }
1483
1484         /* Check if the chain exists */
1485         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1486                 printk(KERN_ERR "Chain doesn't exist\n");
1487                 return -EINVAL;
1488         }
1489
1490         /* Check if all the channels in chain are in use */
1491         if (OMAP_DMA_CHAIN_QFULL(chain_id))
1492                 return -EBUSY;
1493
1494         /* Frame count may be negative in case of indexed transfers */
1495         channels = dma_linked_lch[chain_id].linked_dmach_q;
1496
1497         /* Get a free channel */
1498         lch = channels[dma_linked_lch[chain_id].q_tail];
1499
1500         /* Store the callback data */
1501         dma_chan[lch].data = callbk_data;
1502
1503         /* Increment the q_tail */
1504         OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1505
1506         /* Set the params to the free channel */
1507         if (src_start != 0)
1508                 p->dma_write(src_start, CSSA, lch);
1509         if (dest_start != 0)
1510                 p->dma_write(dest_start, CDSA, lch);
1511
1512         /* Write the buffer size */
1513         p->dma_write(elem_count, CEN, lch);
1514         p->dma_write(frame_count, CFN, lch);
1515
1516         /*
1517          * If the chain is dynamically linked,
1518          * then we may have to start the chain if its not active
1519          */
1520         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1521
1522                 /*
1523                  * In Dynamic chain, if the chain is not started,
1524                  * queue the channel
1525                  */
1526                 if (dma_linked_lch[chain_id].chain_state ==
1527                                                 DMA_CHAIN_NOTSTARTED) {
1528                         /* Enable the link in previous channel */
1529                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1530                                                                 DMA_CH_QUEUED)
1531                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1532                         dma_chan[lch].state = DMA_CH_QUEUED;
1533                 }
1534
1535                 /*
1536                  * Chain is already started, make sure its active,
1537                  * if not then start the chain
1538                  */
1539                 else {
1540                         start_dma = 1;
1541
1542                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1543                                                         DMA_CH_STARTED) {
1544                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1545                                 dma_chan[lch].state = DMA_CH_QUEUED;
1546                                 start_dma = 0;
1547                                 if (0 == ((1 << 7) & p->dma_read(
1548                                         CCR, dma_chan[lch].prev_linked_ch))) {
1549                                         disable_lnk(dma_chan[lch].
1550                                                     prev_linked_ch);
1551                                         pr_debug("\n prev ch is stopped\n");
1552                                         start_dma = 1;
1553                                 }
1554                         }
1555
1556                         else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1557                                                         == DMA_CH_QUEUED) {
1558                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1559                                 dma_chan[lch].state = DMA_CH_QUEUED;
1560                                 start_dma = 0;
1561                         }
1562                         omap_enable_channel_irq(lch);
1563
1564                         l = p->dma_read(CCR, lch);
1565
1566                         if ((0 == (l & (1 << 24))))
1567                                 l &= ~(1 << 25);
1568                         else
1569                                 l |= (1 << 25);
1570                         if (start_dma == 1) {
1571                                 if (0 == (l & (1 << 7))) {
1572                                         l |= (1 << 7);
1573                                         dma_chan[lch].state = DMA_CH_STARTED;
1574                                         pr_debug("starting %d\n", lch);
1575                                         p->dma_write(l, CCR, lch);
1576                                 } else
1577                                         start_dma = 0;
1578                         } else {
1579                                 if (0 == (l & (1 << 7)))
1580                                         p->dma_write(l, CCR, lch);
1581                         }
1582                         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1583                 }
1584         }
1585
1586         return 0;
1587 }
1588 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1589
1590 /**
1591  * @brief omap_start_dma_chain_transfers - Start the chain
1592  *
1593  * @param chain_id
1594  *
1595  * @return - Success : 0
1596  *           Failure : -EINVAL/-EBUSY
1597  */
1598 int omap_start_dma_chain_transfers(int chain_id)
1599 {
1600         int *channels;
1601         u32 l, i;
1602
1603         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1604                 printk(KERN_ERR "Invalid chain id\n");
1605                 return -EINVAL;
1606         }
1607
1608         channels = dma_linked_lch[chain_id].linked_dmach_q;
1609
1610         if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1611                 printk(KERN_ERR "Chain is already started\n");
1612                 return -EBUSY;
1613         }
1614
1615         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1616                 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1617                                                                         i++) {
1618                         enable_lnk(channels[i]);
1619                         omap_enable_channel_irq(channels[i]);
1620                 }
1621         } else {
1622                 omap_enable_channel_irq(channels[0]);
1623         }
1624
1625         l = p->dma_read(CCR, channels[0]);
1626         l |= (1 << 7);
1627         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1628         dma_chan[channels[0]].state = DMA_CH_STARTED;
1629
1630         if ((0 == (l & (1 << 24))))
1631                 l &= ~(1 << 25);
1632         else
1633                 l |= (1 << 25);
1634         p->dma_write(l, CCR, channels[0]);
1635
1636         dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1637
1638         return 0;
1639 }
1640 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1641
1642 /**
1643  * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1644  *
1645  * @param chain_id
1646  *
1647  * @return - Success : 0
1648  *           Failure : EINVAL
1649  */
1650 int omap_stop_dma_chain_transfers(int chain_id)
1651 {
1652         int *channels;
1653         u32 l, i;
1654         u32 sys_cf = 0;
1655
1656         /* Check for input params */
1657         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1658                 printk(KERN_ERR "Invalid chain id\n");
1659                 return -EINVAL;
1660         }
1661
1662         /* Check if the chain exists */
1663         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1664                 printk(KERN_ERR "Chain doesn't exists\n");
1665                 return -EINVAL;
1666         }
1667         channels = dma_linked_lch[chain_id].linked_dmach_q;
1668
1669         if (IS_DMA_ERRATA(DMA_ERRATA_i88)) {
1670                 sys_cf = p->dma_read(OCP_SYSCONFIG, 0);
1671                 l = sys_cf;
1672                 /* Middle mode reg set no Standby */
1673                 l &= ~((1 << 12)|(1 << 13));
1674                 p->dma_write(l, OCP_SYSCONFIG, 0);
1675         }
1676
1677         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1678
1679                 /* Stop the Channel transmission */
1680                 l = p->dma_read(CCR, channels[i]);
1681                 l &= ~(1 << 7);
1682                 p->dma_write(l, CCR, channels[i]);
1683
1684                 /* Disable the link in all the channels */
1685                 disable_lnk(channels[i]);
1686                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1687
1688         }
1689         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1690
1691         /* Reset the Queue pointers */
1692         OMAP_DMA_CHAIN_QINIT(chain_id);
1693
1694         if (IS_DMA_ERRATA(DMA_ERRATA_i88))
1695                 p->dma_write(sys_cf, OCP_SYSCONFIG, 0);
1696
1697         return 0;
1698 }
1699 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1700
1701 /* Get the index of the ongoing DMA in chain */
1702 /**
1703  * @brief omap_get_dma_chain_index - Get the element and frame index
1704  * of the ongoing DMA in chain
1705  *
1706  * @param chain_id
1707  * @param ei - Element index
1708  * @param fi - Frame index
1709  *
1710  * @return - Success : 0
1711  *           Failure : -EINVAL
1712  */
1713 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1714 {
1715         int lch;
1716         int *channels;
1717
1718         /* Check for input params */
1719         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1720                 printk(KERN_ERR "Invalid chain id\n");
1721                 return -EINVAL;
1722         }
1723
1724         /* Check if the chain exists */
1725         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1726                 printk(KERN_ERR "Chain doesn't exists\n");
1727                 return -EINVAL;
1728         }
1729         if ((!ei) || (!fi))
1730                 return -EINVAL;
1731
1732         channels = dma_linked_lch[chain_id].linked_dmach_q;
1733
1734         /* Get the current channel */
1735         lch = channels[dma_linked_lch[chain_id].q_head];
1736
1737         *ei = p->dma_read(CCEN, lch);
1738         *fi = p->dma_read(CCFN, lch);
1739
1740         return 0;
1741 }
1742 EXPORT_SYMBOL(omap_get_dma_chain_index);
1743
1744 /**
1745  * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1746  * ongoing DMA in chain
1747  *
1748  * @param chain_id
1749  *
1750  * @return - Success : Destination position
1751  *           Failure : -EINVAL
1752  */
1753 int omap_get_dma_chain_dst_pos(int chain_id)
1754 {
1755         int lch;
1756         int *channels;
1757
1758         /* Check for input params */
1759         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1760                 printk(KERN_ERR "Invalid chain id\n");
1761                 return -EINVAL;
1762         }
1763
1764         /* Check if the chain exists */
1765         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1766                 printk(KERN_ERR "Chain doesn't exists\n");
1767                 return -EINVAL;
1768         }
1769
1770         channels = dma_linked_lch[chain_id].linked_dmach_q;
1771
1772         /* Get the current channel */
1773         lch = channels[dma_linked_lch[chain_id].q_head];
1774
1775         return p->dma_read(CDAC, lch);
1776 }
1777 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1778
1779 /**
1780  * @brief omap_get_dma_chain_src_pos - Get the source position
1781  * of the ongoing DMA in chain
1782  * @param chain_id
1783  *
1784  * @return - Success : Destination position
1785  *           Failure : -EINVAL
1786  */
1787 int omap_get_dma_chain_src_pos(int chain_id)
1788 {
1789         int lch;
1790         int *channels;
1791
1792         /* Check for input params */
1793         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1794                 printk(KERN_ERR "Invalid chain id\n");
1795                 return -EINVAL;
1796         }
1797
1798         /* Check if the chain exists */
1799         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1800                 printk(KERN_ERR "Chain doesn't exists\n");
1801                 return -EINVAL;
1802         }
1803
1804         channels = dma_linked_lch[chain_id].linked_dmach_q;
1805
1806         /* Get the current channel */
1807         lch = channels[dma_linked_lch[chain_id].q_head];
1808
1809         return p->dma_read(CSAC, lch);
1810 }
1811 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1812 #endif  /* ifndef CONFIG_ARCH_OMAP1 */
1813
1814 /*----------------------------------------------------------------------------*/
1815
1816 #ifdef CONFIG_ARCH_OMAP1
1817
1818 static int omap1_dma_handle_ch(int ch)
1819 {
1820         u32 csr;
1821
1822         if (enable_1510_mode && ch >= 6) {
1823                 csr = dma_chan[ch].saved_csr;
1824                 dma_chan[ch].saved_csr = 0;
1825         } else
1826                 csr = p->dma_read(CSR, ch);
1827         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1828                 dma_chan[ch + 6].saved_csr = csr >> 7;
1829                 csr &= 0x7f;
1830         }
1831         if ((csr & 0x3f) == 0)
1832                 return 0;
1833         if (unlikely(dma_chan[ch].dev_id == -1)) {
1834                 pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
1835                         ch, csr);
1836                 return 0;
1837         }
1838         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1839                 pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
1840         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1841                 pr_warn("DMA synchronization event drop occurred with device %d\n",
1842                         dma_chan[ch].dev_id);
1843         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1844                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1845         if (likely(dma_chan[ch].callback != NULL))
1846                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1847
1848         return 1;
1849 }
1850
1851 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1852 {
1853         int ch = ((int) dev_id) - 1;
1854         int handled = 0;
1855
1856         for (;;) {
1857                 int handled_now = 0;
1858
1859                 handled_now += omap1_dma_handle_ch(ch);
1860                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1861                         handled_now += omap1_dma_handle_ch(ch + 6);
1862                 if (!handled_now)
1863                         break;
1864                 handled += handled_now;
1865         }
1866
1867         return handled ? IRQ_HANDLED : IRQ_NONE;
1868 }
1869
1870 #else
1871 #define omap1_dma_irq_handler   NULL
1872 #endif
1873
1874 #ifdef CONFIG_ARCH_OMAP2PLUS
1875
1876 static int omap2_dma_handle_ch(int ch)
1877 {
1878         u32 status = p->dma_read(CSR, ch);
1879
1880         if (!status) {
1881                 if (printk_ratelimit())
1882                         pr_warn("Spurious DMA IRQ for lch %d\n", ch);
1883                 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1884                 return 0;
1885         }
1886         if (unlikely(dma_chan[ch].dev_id == -1)) {
1887                 if (printk_ratelimit())
1888                         pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
1889                                 status, ch);
1890                 return 0;
1891         }
1892         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1893                 pr_info("DMA synchronization event drop occurred with device %d\n",
1894                         dma_chan[ch].dev_id);
1895         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1896                 printk(KERN_INFO "DMA transaction error with device %d\n",
1897                        dma_chan[ch].dev_id);
1898                 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1899                         u32 ccr;
1900
1901                         ccr = p->dma_read(CCR, ch);
1902                         ccr &= ~OMAP_DMA_CCR_EN;
1903                         p->dma_write(ccr, CCR, ch);
1904                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1905                 }
1906         }
1907         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1908                 printk(KERN_INFO "DMA secure error with device %d\n",
1909                        dma_chan[ch].dev_id);
1910         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1911                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1912                        dma_chan[ch].dev_id);
1913
1914         p->dma_write(status, CSR, ch);
1915         p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1916         /* read back the register to flush the write */
1917         p->dma_read(IRQSTATUS_L0, ch);
1918
1919         /* If the ch is not chained then chain_id will be -1 */
1920         if (dma_chan[ch].chain_id != -1) {
1921                 int chain_id = dma_chan[ch].chain_id;
1922                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1923                 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1924                         dma_chan[dma_chan[ch].next_linked_ch].state =
1925                                                         DMA_CH_STARTED;
1926                 if (dma_linked_lch[chain_id].chain_mode ==
1927                                                 OMAP_DMA_DYNAMIC_CHAIN)
1928                         disable_lnk(ch);
1929
1930                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1931                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1932
1933                 status = p->dma_read(CSR, ch);
1934                 p->dma_write(status, CSR, ch);
1935         }
1936
1937         if (likely(dma_chan[ch].callback != NULL))
1938                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1939
1940         return 0;
1941 }
1942
1943 /* STATUS register count is from 1-32 while our is 0-31 */
1944 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1945 {
1946         u32 val, enable_reg;
1947         int i;
1948
1949         val = p->dma_read(IRQSTATUS_L0, 0);
1950         if (val == 0) {
1951                 if (printk_ratelimit())
1952                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1953                 return IRQ_HANDLED;
1954         }
1955         enable_reg = p->dma_read(IRQENABLE_L0, 0);
1956         val &= enable_reg; /* Dispatch only relevant interrupts */
1957         for (i = 0; i < dma_lch_count && val != 0; i++) {
1958                 if (val & 1)
1959                         omap2_dma_handle_ch(i);
1960                 val >>= 1;
1961         }
1962
1963         return IRQ_HANDLED;
1964 }
1965
1966 static struct irqaction omap24xx_dma_irq = {
1967         .name = "DMA",
1968         .handler = omap2_dma_irq_handler,
1969 };
1970
1971 #else
1972 static struct irqaction omap24xx_dma_irq;
1973 #endif
1974
1975 /*----------------------------------------------------------------------------*/
1976
1977 /*
1978  * Note that we are currently using only IRQENABLE_L0 and L1.
1979  * As the DSP may be using IRQENABLE_L2 and L3, let's not
1980  * touch those for now.
1981  */
1982 void omap_dma_global_context_save(void)
1983 {
1984         omap_dma_global_context.dma_irqenable_l0 =
1985                 p->dma_read(IRQENABLE_L0, 0);
1986         omap_dma_global_context.dma_irqenable_l1 =
1987                 p->dma_read(IRQENABLE_L1, 0);
1988         omap_dma_global_context.dma_ocp_sysconfig =
1989                 p->dma_read(OCP_SYSCONFIG, 0);
1990         omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1991 }
1992
1993 void omap_dma_global_context_restore(void)
1994 {
1995         int ch;
1996
1997         p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1998         p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1999                 OCP_SYSCONFIG, 0);
2000         p->dma_write(omap_dma_global_context.dma_irqenable_l0,
2001                 IRQENABLE_L0, 0);
2002         p->dma_write(omap_dma_global_context.dma_irqenable_l1,
2003                 IRQENABLE_L1, 0);
2004
2005         if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
2006                 p->dma_write(0x3 , IRQSTATUS_L0, 0);
2007
2008         for (ch = 0; ch < dma_chan_count; ch++)
2009                 if (dma_chan[ch].dev_id != -1)
2010                         omap_clear_dma(ch);
2011 }
2012
2013 struct omap_system_dma_plat_info *omap_get_plat_info(void)
2014 {
2015         return p;
2016 }
2017 EXPORT_SYMBOL_GPL(omap_get_plat_info);
2018
2019 static int omap_system_dma_probe(struct platform_device *pdev)
2020 {
2021         int ch, ret = 0;
2022         int dma_irq;
2023         char irq_name[4];
2024         int irq_rel;
2025
2026         p = pdev->dev.platform_data;
2027         if (!p) {
2028                 dev_err(&pdev->dev,
2029                         "%s: System DMA initialized without platform data\n",
2030                         __func__);
2031                 return -EINVAL;
2032         }
2033
2034         d                       = p->dma_attr;
2035         errata                  = p->errata;
2036
2037         if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
2038                         && (omap_dma_reserve_channels < d->lch_count))
2039                 d->lch_count    = omap_dma_reserve_channels;
2040
2041         dma_lch_count           = d->lch_count;
2042         dma_chan_count          = dma_lch_count;
2043         enable_1510_mode        = d->dev_caps & ENABLE_1510_MODE;
2044
2045         dma_chan = devm_kcalloc(&pdev->dev, dma_lch_count,
2046                                 sizeof(struct omap_dma_lch), GFP_KERNEL);
2047         if (!dma_chan) {
2048                 dev_err(&pdev->dev, "%s: kzalloc fail\n", __func__);
2049                 return -ENOMEM;
2050         }
2051
2052
2053         if (dma_omap2plus()) {
2054                 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2055                                                 dma_lch_count, GFP_KERNEL);
2056                 if (!dma_linked_lch) {
2057                         ret = -ENOMEM;
2058                         goto exit_dma_lch_fail;
2059                 }
2060         }
2061
2062         spin_lock_init(&dma_chan_lock);
2063         for (ch = 0; ch < dma_chan_count; ch++) {
2064                 omap_clear_dma(ch);
2065                 if (dma_omap2plus())
2066                         omap2_disable_irq_lch(ch);
2067
2068                 dma_chan[ch].dev_id = -1;
2069                 dma_chan[ch].next_lch = -1;
2070
2071                 if (ch >= 6 && enable_1510_mode)
2072                         continue;
2073
2074                 if (dma_omap1()) {
2075                         /*
2076                          * request_irq() doesn't like dev_id (ie. ch) being
2077                          * zero, so we have to kludge around this.
2078                          */
2079                         sprintf(&irq_name[0], "%d", ch);
2080                         dma_irq = platform_get_irq_byname(pdev, irq_name);
2081
2082                         if (dma_irq < 0) {
2083                                 ret = dma_irq;
2084                                 goto exit_dma_irq_fail;
2085                         }
2086
2087                         /* INT_DMA_LCD is handled in lcd_dma.c */
2088                         if (dma_irq == INT_DMA_LCD)
2089                                 continue;
2090
2091                         ret = request_irq(dma_irq,
2092                                         omap1_dma_irq_handler, 0, "DMA",
2093                                         (void *) (ch + 1));
2094                         if (ret != 0)
2095                                 goto exit_dma_irq_fail;
2096                 }
2097         }
2098
2099         if (d->dev_caps & IS_RW_PRIORITY)
2100                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2101                                 DMA_DEFAULT_FIFO_DEPTH, 0);
2102
2103         if (dma_omap2plus()) {
2104                 strcpy(irq_name, "0");
2105                 dma_irq = platform_get_irq_byname(pdev, irq_name);
2106                 if (dma_irq < 0) {
2107                         dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
2108                         ret = dma_irq;
2109                         goto exit_dma_lch_fail;
2110                 }
2111                 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
2112                 if (ret) {
2113                         dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
2114                                 dma_irq, ret);
2115                         goto exit_dma_lch_fail;
2116                 }
2117         }
2118
2119         /* reserve dma channels 0 and 1 in high security devices on 34xx */
2120         if (d->dev_caps & HS_CHANNELS_RESERVED) {
2121                 pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
2122                 dma_chan[0].dev_id = 0;
2123                 dma_chan[1].dev_id = 1;
2124         }
2125         p->show_dma_caps();
2126         return 0;
2127
2128 exit_dma_irq_fail:
2129         dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
2130                 dma_irq, ret);
2131         for (irq_rel = 0; irq_rel < ch; irq_rel++) {
2132                 dma_irq = platform_get_irq(pdev, irq_rel);
2133                 free_irq(dma_irq, (void *)(irq_rel + 1));
2134         }
2135
2136 exit_dma_lch_fail:
2137         return ret;
2138 }
2139
2140 static int omap_system_dma_remove(struct platform_device *pdev)
2141 {
2142         int dma_irq;
2143
2144         if (dma_omap2plus()) {
2145                 char irq_name[4];
2146                 strcpy(irq_name, "0");
2147                 dma_irq = platform_get_irq_byname(pdev, irq_name);
2148                 remove_irq(dma_irq, &omap24xx_dma_irq);
2149         } else {
2150                 int irq_rel = 0;
2151                 for ( ; irq_rel < dma_chan_count; irq_rel++) {
2152                         dma_irq = platform_get_irq(pdev, irq_rel);
2153                         free_irq(dma_irq, (void *)(irq_rel + 1));
2154                 }
2155         }
2156         return 0;
2157 }
2158
2159 static struct platform_driver omap_system_dma_driver = {
2160         .probe          = omap_system_dma_probe,
2161         .remove         = omap_system_dma_remove,
2162         .driver         = {
2163                 .name   = "omap_dma_system"
2164         },
2165 };
2166
2167 static int __init omap_system_dma_init(void)
2168 {
2169         return platform_driver_register(&omap_system_dma_driver);
2170 }
2171 arch_initcall(omap_system_dma_init);
2172
2173 static void __exit omap_system_dma_exit(void)
2174 {
2175         platform_driver_unregister(&omap_system_dma_driver);
2176 }
2177
2178 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
2179 MODULE_LICENSE("GPL");
2180 MODULE_ALIAS("platform:" DRIVER_NAME);
2181 MODULE_AUTHOR("Texas Instruments Inc");
2182
2183 /*
2184  * Reserve the omap SDMA channels using cmdline bootarg
2185  * "omap_dma_reserve_ch=". The valid range is 1 to 32
2186  */
2187 static int __init omap_dma_cmdline_reserve_ch(char *str)
2188 {
2189         if (get_option(&str, &omap_dma_reserve_channels) != 1)
2190                 omap_dma_reserve_channels = 0;
2191         return 1;
2192 }
2193
2194 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2195
2196