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 #ifdef CONFIG_ARCH_OMAP1
  42 #include <mach/soc.h>
  43 #endif
  44
  45 /*
  46  * MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
  47  * channels that an instance of the SDMA IP block can support.  Used
  48  * to size arrays.  (The actual maximum on a particular SoC may be less
  49  * than this -- for example, OMAP1 SDMA instances only support 17 logical
  50  * DMA channels.)
  51  */
  52 #define MAX_LOGICAL_DMA_CH_COUNT                32
  53
  54 #undef DEBUG
  55
  56 #ifndef CONFIG_ARCH_OMAP1
  57 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
  58         DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
  59 };
  60
  61 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
  62 #endif
  63
  64 #define OMAP_DMA_ACTIVE                 0x01
  65 #define OMAP2_DMA_CSR_CLEAR_MASK        0xffffffff
  66
  67 #define OMAP_FUNC_MUX_ARM_BASE          (0xfffe1000 + 0xec)
  68
  69 static struct omap_system_dma_plat_info *p;
  70 static struct omap_dma_dev_attr *d;
  71 static void omap_clear_dma(int lch);
  72 static int omap_dma_set_prio_lch(int lch, unsigned char read_prio,
  73                                  unsigned char write_prio);
  74 static int enable_1510_mode;
  75 static u32 errata;
  76
  77 static struct omap_dma_global_context_registers {
  78         u32 dma_irqenable_l0;
  79         u32 dma_irqenable_l1;
  80         u32 dma_ocp_sysconfig;
  81         u32 dma_gcr;
  82 } omap_dma_global_context;
  83
  84 struct dma_link_info {
  85         int *linked_dmach_q;
  86         int no_of_lchs_linked;
  87
  88         int q_count;
  89         int q_tail;
  90         int q_head;
  91
  92         int chain_state;
  93         int chain_mode;
  94
  95 };
  96
  97 static struct dma_link_info *dma_linked_lch;
  98
  99 #ifndef CONFIG_ARCH_OMAP1
 100
 101 /* Chain handling macros */
 102 #define OMAP_DMA_CHAIN_QINIT(chain_id)                                  \
 103         do {                                                            \
 104                 dma_linked_lch[chain_id].q_head =                       \
 105                 dma_linked_lch[chain_id].q_tail =                       \
 106                 dma_linked_lch[chain_id].q_count = 0;                   \
 107         } while (0)
 108 #define OMAP_DMA_CHAIN_QFULL(chain_id)                                  \
 109                 (dma_linked_lch[chain_id].no_of_lchs_linked ==          \
 110                 dma_linked_lch[chain_id].q_count)
 111 #define OMAP_DMA_CHAIN_QLAST(chain_id)                                  \
 112         do {                                                            \
 113                 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==      \
 114                 dma_linked_lch[chain_id].q_count)                       \
 115         } while (0)
 116 #define OMAP_DMA_CHAIN_QEMPTY(chain_id)                                 \
 117                 (0 == dma_linked_lch[chain_id].q_count)
 118 #define __OMAP_DMA_CHAIN_INCQ(end)                                      \
 119         ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
 120 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id)                               \
 121         do {                                                            \
 122                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
 123                 dma_linked_lch[chain_id].q_count--;                     \
 124         } while (0)
 125
 126 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id)                               \
 127         do {                                                            \
 128                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
 129                 dma_linked_lch[chain_id].q_count++; \
 130         } while (0)
 131 #endif
 132
 133 static int dma_lch_count;
 134 static int dma_chan_count;
 135 static int omap_dma_reserve_channels;
 136
 137 static spinlock_t dma_chan_lock;
 138 static struct omap_dma_lch *dma_chan;
 139
 140 static inline void disable_lnk(int lch);
 141 static void omap_disable_channel_irq(int lch);
 142 static inline void omap_enable_channel_irq(int lch);
 143
 144 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 145                                                 __func__);
 146
 147 #ifdef CONFIG_ARCH_OMAP15XX
 148 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 149 static int omap_dma_in_1510_mode(void)
 150 {
 151         return enable_1510_mode;
 152 }
 153 #else
 154 #define omap_dma_in_1510_mode()         0
 155 #endif
 156
 157 #ifdef CONFIG_ARCH_OMAP1
 158 static inline void set_gdma_dev(int req, int dev)
 159 {
 160         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 161         int shift = ((req - 1) % 5) * 6;
 162         u32 l;
 163
 164         l = omap_readl(reg);
 165         l &= ~(0x3f << shift);
 166         l |= (dev - 1) << shift;
 167         omap_writel(l, reg);
 168 }
 169 #else
 170 #define set_gdma_dev(req, dev)  do {} while (0)
 171 #define omap_readl(reg)         0
 172 #define omap_writel(val, reg)   do {} while (0)
 173 #endif
 174
 175 #ifdef CONFIG_ARCH_OMAP1
 176 void omap_set_dma_priority(int lch, int dst_port, int priority)
 177 {
 178         unsigned long reg;
 179         u32 l;
 180
 181         if (dma_omap1()) {
 182                 switch (dst_port) {
 183                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 184                         reg = OMAP_TC_OCPT1_PRIOR;
 185                         break;
 186                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 187                         reg = OMAP_TC_OCPT2_PRIOR;
 188                         break;
 189                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 190                         reg = OMAP_TC_EMIFF_PRIOR;
 191                         break;
 192                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 193                         reg = OMAP_TC_EMIFS_PRIOR;
 194                         break;
 195                 default:
 196                         BUG();
 197                         return;
 198                 }
 199                 l = omap_readl(reg);
 200                 l &= ~(0xf << 8);
 201                 l |= (priority & 0xf) << 8;
 202                 omap_writel(l, reg);
 203         }
 204 }
 205 #endif
 206
 207 #ifdef CONFIG_ARCH_OMAP2PLUS
 208 void omap_set_dma_priority(int lch, int dst_port, int priority)
 209 {
 210         u32 ccr;
 211
 212         ccr = p->dma_read(CCR, lch);
 213         if (priority)
 214                 ccr |= (1 << 6);
 215         else
 216                 ccr &= ~(1 << 6);
 217         p->dma_write(ccr, CCR, lch);
 218 }
 219 #endif
 220 EXPORT_SYMBOL(omap_set_dma_priority);
 221
 222 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 223                                   int frame_count, int sync_mode,
 224                                   int dma_trigger, int src_or_dst_synch)
 225 {
 226         u32 l;
 227
 228         l = p->dma_read(CSDP, lch);
 229         l &= ~0x03;
 230         l |= data_type;
 231         p->dma_write(l, CSDP, lch);
 232
 233         if (dma_omap1()) {
 234                 u16 ccr;
 235
 236                 ccr = p->dma_read(CCR, lch);
 237                 ccr &= ~(1 << 5);
 238                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 239                         ccr |= 1 << 5;
 240                 p->dma_write(ccr, CCR, lch);
 241
 242                 ccr = p->dma_read(CCR2, lch);
 243                 ccr &= ~(1 << 2);
 244                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 245                         ccr |= 1 << 2;
 246                 p->dma_write(ccr, CCR2, lch);
 247         }
 248
 249         if (dma_omap2plus() && dma_trigger) {
 250                 u32 val;
 251
 252                 val = p->dma_read(CCR, lch);
 253
 254                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 255                 val &= ~((1 << 23) | (3 << 19) | 0x1f);
 256                 val |= (dma_trigger & ~0x1f) << 14;
 257                 val |= dma_trigger & 0x1f;
 258
 259                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 260                         val |= 1 << 5;
 261                 else
 262                         val &= ~(1 << 5);
 263
 264                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 265                         val |= 1 << 18;
 266                 else
 267                         val &= ~(1 << 18);
 268
 269                 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
 270                         val &= ~(1 << 24);      /* dest synch */
 271                         val |= (1 << 23);       /* Prefetch */
 272                 } else if (src_or_dst_synch) {
 273                         val |= 1 << 24;         /* source synch */
 274                 } else {
 275                         val &= ~(1 << 24);      /* dest synch */
 276                 }
 277                 p->dma_write(val, CCR, lch);
 278         }
 279
 280         p->dma_write(elem_count, CEN, lch);
 281         p->dma_write(frame_count, CFN, lch);
 282 }
 283 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 284
 285 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 286 {
 287         if (dma_omap2plus()) {
 288                 u32 csdp;
 289
 290                 csdp = p->dma_read(CSDP, lch);
 291                 csdp &= ~(0x3 << 16);
 292                 csdp |= (mode << 16);
 293                 p->dma_write(csdp, CSDP, lch);
 294         }
 295 }
 296 EXPORT_SYMBOL(omap_set_dma_write_mode);
 297
 298 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 299 {
 300         if (dma_omap1() && !dma_omap15xx()) {
 301                 u32 l;
 302
 303                 l = p->dma_read(LCH_CTRL, lch);
 304                 l &= ~0x7;
 305                 l |= mode;
 306                 p->dma_write(l, LCH_CTRL, lch);
 307         }
 308 }
 309 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 310
 311 /* Note that src_port is only for omap1 */
 312 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 313                              unsigned long src_start,
 314                              int src_ei, int src_fi)
 315 {
 316         u32 l;
 317
 318         if (dma_omap1()) {
 319                 u16 w;
 320
 321                 w = p->dma_read(CSDP, lch);
 322                 w &= ~(0x1f << 2);
 323                 w |= src_port << 2;
 324                 p->dma_write(w, CSDP, lch);
 325         }
 326
 327         l = p->dma_read(CCR, lch);
 328         l &= ~(0x03 << 12);
 329         l |= src_amode << 12;
 330         p->dma_write(l, CCR, lch);
 331
 332         p->dma_write(src_start, CSSA, lch);
 333
 334         p->dma_write(src_ei, CSEI, lch);
 335         p->dma_write(src_fi, CSFI, lch);
 336 }
 337 EXPORT_SYMBOL(omap_set_dma_src_params);
 338
 339 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 340 {
 341         omap_set_dma_transfer_params(lch, params->data_type,
 342                                      params->elem_count, params->frame_count,
 343                                      params->sync_mode, params->trigger,
 344                                      params->src_or_dst_synch);
 345         omap_set_dma_src_params(lch, params->src_port,
 346                                 params->src_amode, params->src_start,
 347                                 params->src_ei, params->src_fi);
 348
 349         omap_set_dma_dest_params(lch, params->dst_port,
 350                                  params->dst_amode, params->dst_start,
 351                                  params->dst_ei, params->dst_fi);
 352         if (params->read_prio || params->write_prio)
 353                 omap_dma_set_prio_lch(lch, params->read_prio,
 354                                       params->write_prio);
 355 }
 356 EXPORT_SYMBOL(omap_set_dma_params);
 357
 358 void omap_set_dma_src_data_pack(int lch, int enable)
 359 {
 360         u32 l;
 361
 362         l = p->dma_read(CSDP, lch);
 363         l &= ~(1 << 6);
 364         if (enable)
 365                 l |= (1 << 6);
 366         p->dma_write(l, CSDP, lch);
 367 }
 368 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 369
 370 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 371 {
 372         unsigned int burst = 0;
 373         u32 l;
 374
 375         l = p->dma_read(CSDP, lch);
 376         l &= ~(0x03 << 7);
 377
 378         switch (burst_mode) {
 379         case OMAP_DMA_DATA_BURST_DIS:
 380                 break;
 381         case OMAP_DMA_DATA_BURST_4:
 382                 if (dma_omap2plus())
 383                         burst = 0x1;
 384                 else
 385                         burst = 0x2;
 386                 break;
 387         case OMAP_DMA_DATA_BURST_8:
 388                 if (dma_omap2plus()) {
 389                         burst = 0x2;
 390                         break;
 391                 }
 392                 /*
 393                  * not supported by current hardware on OMAP1
 394                  * w |= (0x03 << 7);
 395                  * fall through
 396                  */
 397         case OMAP_DMA_DATA_BURST_16:
 398                 if (dma_omap2plus()) {
 399                         burst = 0x3;
 400                         break;
 401                 }
 402                 /*
 403                  * OMAP1 don't support burst 16
 404                  * fall through
 405                  */
 406         default:
 407                 BUG();
 408         }
 409
 410         l |= (burst << 7);
 411         p->dma_write(l, CSDP, lch);
 412 }
 413 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 414
 415 /* Note that dest_port is only for OMAP1 */
 416 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 417                               unsigned long dest_start,
 418                               int dst_ei, int dst_fi)
 419 {
 420         u32 l;
 421
 422         if (dma_omap1()) {
 423                 l = p->dma_read(CSDP, lch);
 424                 l &= ~(0x1f << 9);
 425                 l |= dest_port << 9;
 426                 p->dma_write(l, CSDP, lch);
 427         }
 428
 429         l = p->dma_read(CCR, lch);
 430         l &= ~(0x03 << 14);
 431         l |= dest_amode << 14;
 432         p->dma_write(l, CCR, lch);
 433
 434         p->dma_write(dest_start, CDSA, lch);
 435
 436         p->dma_write(dst_ei, CDEI, lch);
 437         p->dma_write(dst_fi, CDFI, lch);
 438 }
 439 EXPORT_SYMBOL(omap_set_dma_dest_params);
 440
 441 void omap_set_dma_dest_data_pack(int lch, int enable)
 442 {
 443         u32 l;
 444
 445         l = p->dma_read(CSDP, lch);
 446         l &= ~(1 << 13);
 447         if (enable)
 448                 l |= 1 << 13;
 449         p->dma_write(l, CSDP, lch);
 450 }
 451 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 452
 453 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 454 {
 455         unsigned int burst = 0;
 456         u32 l;
 457
 458         l = p->dma_read(CSDP, lch);
 459         l &= ~(0x03 << 14);
 460
 461         switch (burst_mode) {
 462         case OMAP_DMA_DATA_BURST_DIS:
 463                 break;
 464         case OMAP_DMA_DATA_BURST_4:
 465                 if (dma_omap2plus())
 466                         burst = 0x1;
 467                 else
 468                         burst = 0x2;
 469                 break;
 470         case OMAP_DMA_DATA_BURST_8:
 471                 if (dma_omap2plus())
 472                         burst = 0x2;
 473                 else
 474                         burst = 0x3;
 475                 break;
 476         case OMAP_DMA_DATA_BURST_16:
 477                 if (dma_omap2plus()) {
 478                         burst = 0x3;
 479                         break;
 480                 }
 481                 /*
 482                  * OMAP1 don't support burst 16
 483                  * fall through
 484                  */
 485         default:
 486                 printk(KERN_ERR "Invalid DMA burst mode\n");
 487                 BUG();
 488                 return;
 489         }
 490         l |= (burst << 14);
 491         p->dma_write(l, CSDP, lch);
 492 }
 493 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 494
 495 static inline void omap_enable_channel_irq(int lch)
 496 {
 497         /* Clear CSR */
 498         if (dma_omap1())
 499                 p->dma_read(CSR, lch);
 500         else
 501                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 502
 503         /* Enable some nice interrupts. */
 504         p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
 505 }
 506
 507 static inline void omap_disable_channel_irq(int lch)
 508 {
 509         /* disable channel interrupts */
 510         p->dma_write(0, CICR, lch);
 511         /* Clear CSR */
 512         if (dma_omap1())
 513                 p->dma_read(CSR, lch);
 514         else
 515                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 516 }
 517
 518 void omap_enable_dma_irq(int lch, u16 bits)
 519 {
 520         dma_chan[lch].enabled_irqs |= bits;
 521 }
 522 EXPORT_SYMBOL(omap_enable_dma_irq);
 523
 524 void omap_disable_dma_irq(int lch, u16 bits)
 525 {
 526         dma_chan[lch].enabled_irqs &= ~bits;
 527 }
 528 EXPORT_SYMBOL(omap_disable_dma_irq);
 529
 530 static inline void enable_lnk(int lch)
 531 {
 532         u32 l;
 533
 534         l = p->dma_read(CLNK_CTRL, lch);
 535
 536         if (dma_omap1())
 537                 l &= ~(1 << 14);
 538
 539         /* Set the ENABLE_LNK bits */
 540         if (dma_chan[lch].next_lch != -1)
 541                 l = dma_chan[lch].next_lch | (1 << 15);
 542
 543 #ifndef CONFIG_ARCH_OMAP1
 544         if (dma_omap2plus())
 545                 if (dma_chan[lch].next_linked_ch != -1)
 546                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 547 #endif
 548
 549         p->dma_write(l, CLNK_CTRL, lch);
 550 }
 551
 552 static inline void disable_lnk(int lch)
 553 {
 554         u32 l;
 555
 556         l = p->dma_read(CLNK_CTRL, lch);
 557
 558         /* Disable interrupts */
 559         omap_disable_channel_irq(lch);
 560
 561         if (dma_omap1()) {
 562                 /* Set the STOP_LNK bit */
 563                 l |= 1 << 14;
 564         }
 565
 566         if (dma_omap2plus()) {
 567                 /* Clear the ENABLE_LNK bit */
 568                 l &= ~(1 << 15);
 569         }
 570
 571         p->dma_write(l, CLNK_CTRL, lch);
 572         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 573 }
 574
 575 static inline void omap2_enable_irq_lch(int lch)
 576 {
 577         u32 val;
 578         unsigned long flags;
 579
 580         if (dma_omap1())
 581                 return;
 582
 583         spin_lock_irqsave(&dma_chan_lock, flags);
 584         /* clear IRQ STATUS */
 585         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 586         /* Enable interrupt */
 587         val = p->dma_read(IRQENABLE_L0, lch);
 588         val |= 1 << lch;
 589         p->dma_write(val, IRQENABLE_L0, lch);
 590         spin_unlock_irqrestore(&dma_chan_lock, flags);
 591 }
 592
 593 static inline void omap2_disable_irq_lch(int lch)
 594 {
 595         u32 val;
 596         unsigned long flags;
 597
 598         if (dma_omap1())
 599                 return;
 600
 601         spin_lock_irqsave(&dma_chan_lock, flags);
 602         /* Disable interrupt */
 603         val = p->dma_read(IRQENABLE_L0, lch);
 604         val &= ~(1 << lch);
 605         p->dma_write(val, IRQENABLE_L0, lch);
 606         /* clear IRQ STATUS */
 607         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 608         spin_unlock_irqrestore(&dma_chan_lock, flags);
 609 }
 610
 611 int omap_request_dma(int dev_id, const char *dev_name,
 612                      void (*callback)(int lch, u16 ch_status, void *data),
 613                      void *data, int *dma_ch_out)
 614 {
 615         int ch, free_ch = -1;
 616         unsigned long flags;
 617         struct omap_dma_lch *chan;
 618
 619         WARN(strcmp(dev_name, "DMA engine"), "Using deprecated platform DMA API - please update to DMA engine");
 620
 621         spin_lock_irqsave(&dma_chan_lock, flags);
 622         for (ch = 0; ch < dma_chan_count; ch++) {
 623                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 624                         free_ch = ch;
 625                         /* Exit after first free channel found */
 626                         break;
 627                 }
 628         }
 629         if (free_ch == -1) {
 630                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 631                 return -EBUSY;
 632         }
 633         chan = dma_chan + free_ch;
 634         chan->dev_id = dev_id;
 635
 636         if (p->clear_lch_regs)
 637                 p->clear_lch_regs(free_ch);
 638
 639         if (dma_omap2plus())
 640                 omap_clear_dma(free_ch);
 641
 642         spin_unlock_irqrestore(&dma_chan_lock, flags);
 643
 644         chan->dev_name = dev_name;
 645         chan->callback = callback;
 646         chan->data = data;
 647         chan->flags = 0;
 648
 649 #ifndef CONFIG_ARCH_OMAP1
 650         if (dma_omap2plus()) {
 651                 chan->chain_id = -1;
 652                 chan->next_linked_ch = -1;
 653         }
 654 #endif
 655
 656         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 657
 658         if (dma_omap1())
 659                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 660         else if (dma_omap2plus())
 661                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 662                         OMAP2_DMA_TRANS_ERR_IRQ;
 663
 664         if (dma_omap16xx()) {
 665                 /* If the sync device is set, configure it dynamically. */
 666                 if (dev_id != 0) {
 667                         set_gdma_dev(free_ch + 1, dev_id);
 668                         dev_id = free_ch + 1;
 669                 }
 670                 /*
 671                  * Disable the 1510 compatibility mode and set the sync device
 672                  * id.
 673                  */
 674                 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
 675         } else if (dma_omap1()) {
 676                 p->dma_write(dev_id, CCR, free_ch);
 677         }
 678
 679         if (dma_omap2plus()) {
 680                 omap_enable_channel_irq(free_ch);
 681                 omap2_enable_irq_lch(free_ch);
 682         }
 683
 684         *dma_ch_out = free_ch;
 685
 686         return 0;
 687 }
 688 EXPORT_SYMBOL(omap_request_dma);
 689
 690 void omap_free_dma(int lch)
 691 {
 692         unsigned long flags;
 693
 694         if (dma_chan[lch].dev_id == -1) {
 695                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 696                        lch);
 697                 return;
 698         }
 699
 700         /* Disable interrupt for logical channel */
 701         if (dma_omap2plus())
 702                 omap2_disable_irq_lch(lch);
 703
 704         /* Disable all DMA interrupts for the channel. */
 705         omap_disable_channel_irq(lch);
 706
 707         /* Make sure the DMA transfer is stopped. */
 708         p->dma_write(0, CCR, lch);
 709
 710         /* Clear registers */
 711         if (dma_omap2plus())
 712                 omap_clear_dma(lch);
 713
 714         spin_lock_irqsave(&dma_chan_lock, flags);
 715         dma_chan[lch].dev_id = -1;
 716         dma_chan[lch].next_lch = -1;
 717         dma_chan[lch].callback = NULL;
 718         spin_unlock_irqrestore(&dma_chan_lock, flags);
 719 }
 720 EXPORT_SYMBOL(omap_free_dma);
 721
 722 /**
 723  * @brief omap_dma_set_global_params : Set global priority settings for dma
 724  *
 725  * @param arb_rate
 726  * @param max_fifo_depth
 727  * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
 728  *                                                 DMA_THREAD_RESERVE_ONET
 729  *                                                 DMA_THREAD_RESERVE_TWOT
 730  *                                                 DMA_THREAD_RESERVE_THREET
 731  */
 732 void
 733 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 734 {
 735         u32 reg;
 736
 737         if (dma_omap1()) {
 738                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 739                 return;
 740         }
 741
 742         if (max_fifo_depth == 0)
 743                 max_fifo_depth = 1;
 744         if (arb_rate == 0)
 745                 arb_rate = 1;
 746
 747         reg = 0xff & max_fifo_depth;
 748         reg |= (0x3 & tparams) << 12;
 749         reg |= (arb_rate & 0xff) << 16;
 750
 751         p->dma_write(reg, GCR, 0);
 752 }
 753 EXPORT_SYMBOL(omap_dma_set_global_params);
 754
 755 /**
 756  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 757  *
 758  * @param lch
 759  * @param read_prio - Read priority
 760  * @param write_prio - Write priority
 761  * Both of the above can be set with one of the following values :
 762  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 763  */
 764 static int
 765 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 766                       unsigned char write_prio)
 767 {
 768         u32 l;
 769
 770         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 771                 printk(KERN_ERR "Invalid channel id\n");
 772                 return -EINVAL;
 773         }
 774         l = p->dma_read(CCR, lch);
 775         l &= ~((1 << 6) | (1 << 26));
 776         if (d->dev_caps & IS_RW_PRIORITY)
 777                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 778         else
 779                 l |= ((read_prio & 0x1) << 6);
 780
 781         p->dma_write(l, CCR, lch);
 782
 783         return 0;
 784 }
 785
 786
 787 /*
 788  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 789  * through omap_start_dma(). Any buffers in flight are discarded.
 790  */
 791 static void omap_clear_dma(int lch)
 792 {
 793         unsigned long flags;
 794
 795         local_irq_save(flags);
 796         p->clear_dma(lch);
 797         local_irq_restore(flags);
 798 }
 799
 800 void omap_start_dma(int lch)
 801 {
 802         u32 l;
 803
 804         /*
 805          * The CPC/CDAC register needs to be initialized to zero
 806          * before starting dma transfer.
 807          */
 808         if (dma_omap15xx())
 809                 p->dma_write(0, CPC, lch);
 810         else
 811                 p->dma_write(0, CDAC, lch);
 812
 813         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 814                 int next_lch, cur_lch;
 815                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 816
 817                 /* Set the link register of the first channel */
 818                 enable_lnk(lch);
 819
 820                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 821                 dma_chan_link_map[lch] = 1;
 822
 823                 cur_lch = dma_chan[lch].next_lch;
 824                 do {
 825                         next_lch = dma_chan[cur_lch].next_lch;
 826
 827                         /* The loop case: we've been here already */
 828                         if (dma_chan_link_map[cur_lch])
 829                                 break;
 830                         /* Mark the current channel */
 831                         dma_chan_link_map[cur_lch] = 1;
 832
 833                         enable_lnk(cur_lch);
 834                         omap_enable_channel_irq(cur_lch);
 835
 836                         cur_lch = next_lch;
 837                 } while (next_lch != -1);
 838         } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
 839                 p->dma_write(lch, CLNK_CTRL, lch);
 840
 841         omap_enable_channel_irq(lch);
 842
 843         l = p->dma_read(CCR, lch);
 844
 845         if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
 846                         l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
 847         l |= OMAP_DMA_CCR_EN;
 848
 849         /*
 850          * As dma_write() uses IO accessors which are weakly ordered, there
 851          * is no guarantee that data in coherent DMA memory will be visible
 852          * to the DMA device.  Add a memory barrier here to ensure that any
 853          * such data is visible prior to enabling DMA.
 854          */
 855         mb();
 856         p->dma_write(l, CCR, lch);
 857
 858         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 859 }
 860 EXPORT_SYMBOL(omap_start_dma);
 861
 862 void omap_stop_dma(int lch)
 863 {
 864         u32 l;
 865
 866         /* Disable all interrupts on the channel */
 867         omap_disable_channel_irq(lch);
 868
 869         l = p->dma_read(CCR, lch);
 870         if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
 871                         (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
 872                 int i = 0;
 873                 u32 sys_cf;
 874
 875                 /* Configure No-Standby */
 876                 l = p->dma_read(OCP_SYSCONFIG, lch);
 877                 sys_cf = l;
 878                 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
 879                 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
 880                 p->dma_write(l , OCP_SYSCONFIG, 0);
 881
 882                 l = p->dma_read(CCR, lch);
 883                 l &= ~OMAP_DMA_CCR_EN;
 884                 p->dma_write(l, CCR, lch);
 885
 886                 /* Wait for sDMA FIFO drain */
 887                 l = p->dma_read(CCR, lch);
 888                 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
 889                                         OMAP_DMA_CCR_WR_ACTIVE))) {
 890                         udelay(5);
 891                         i++;
 892                         l = p->dma_read(CCR, lch);
 893                 }
 894                 if (i >= 100)
 895                         pr_err("DMA drain did not complete on lch %d\n", lch);
 896                 /* Restore OCP_SYSCONFIG */
 897                 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
 898         } else {
 899                 l &= ~OMAP_DMA_CCR_EN;
 900                 p->dma_write(l, CCR, lch);
 901         }
 902
 903         /*
 904          * Ensure that data transferred by DMA is visible to any access
 905          * after DMA has been disabled.  This is important for coherent
 906          * DMA regions.
 907          */
 908         mb();
 909
 910         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 911                 int next_lch, cur_lch = lch;
 912                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 913
 914                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 915                 do {
 916                         /* The loop case: we've been here already */
 917                         if (dma_chan_link_map[cur_lch])
 918                                 break;
 919                         /* Mark the current channel */
 920                         dma_chan_link_map[cur_lch] = 1;
 921
 922                         disable_lnk(cur_lch);
 923
 924                         next_lch = dma_chan[cur_lch].next_lch;
 925                         cur_lch = next_lch;
 926                 } while (next_lch != -1);
 927         }
 928
 929         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 930 }
 931 EXPORT_SYMBOL(omap_stop_dma);
 932
 933 /*
 934  * Allows changing the DMA callback function or data. This may be needed if
 935  * the driver shares a single DMA channel for multiple dma triggers.
 936  */
 937 int omap_set_dma_callback(int lch,
 938                           void (*callback)(int lch, u16 ch_status, void *data),
 939                           void *data)
 940 {
 941         unsigned long flags;
 942
 943         if (lch < 0)
 944                 return -ENODEV;
 945
 946         spin_lock_irqsave(&dma_chan_lock, flags);
 947         if (dma_chan[lch].dev_id == -1) {
 948                 printk(KERN_ERR "DMA callback for not set for free channel\n");
 949                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 950                 return -EINVAL;
 951         }
 952         dma_chan[lch].callback = callback;
 953         dma_chan[lch].data = data;
 954         spin_unlock_irqrestore(&dma_chan_lock, flags);
 955
 956         return 0;
 957 }
 958 EXPORT_SYMBOL(omap_set_dma_callback);
 959
 960 /*
 961  * Returns current physical source address for the given DMA channel.
 962  * If the channel is running the caller must disable interrupts prior calling
 963  * this function and process the returned value before re-enabling interrupt to
 964  * prevent races with the interrupt handler. Note that in continuous mode there
 965  * is a chance for CSSA_L register overflow between the two reads resulting
 966  * in incorrect return value.
 967  */
 968 dma_addr_t omap_get_dma_src_pos(int lch)
 969 {
 970         dma_addr_t offset = 0;
 971
 972         if (dma_omap15xx())
 973                 offset = p->dma_read(CPC, lch);
 974         else
 975                 offset = p->dma_read(CSAC, lch);
 976
 977         if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
 978                 offset = p->dma_read(CSAC, lch);
 979
 980         if (!dma_omap15xx()) {
 981                 /*
 982                  * CDAC == 0 indicates that the DMA transfer on the channel has
 983                  * not been started (no data has been transferred so far).
 984                  * Return the programmed source start address in this case.
 985                  */
 986                 if (likely(p->dma_read(CDAC, lch)))
 987                         offset = p->dma_read(CSAC, lch);
 988                 else
 989                         offset = p->dma_read(CSSA, lch);
 990         }
 991
 992         if (dma_omap1())
 993                 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
 994
 995         return offset;
 996 }
 997 EXPORT_SYMBOL(omap_get_dma_src_pos);
 998
 999 /*
1000  * Returns current physical destination address for the given DMA channel.
1001  * If the channel is running the caller must disable interrupts prior calling
1002  * this function and process the returned value before re-enabling interrupt to
1003  * prevent races with the interrupt handler. Note that in continuous mode there
1004  * is a chance for CDSA_L register overflow between the two reads resulting
1005  * in incorrect return value.
1006  */
1007 dma_addr_t omap_get_dma_dst_pos(int lch)
1008 {
1009         dma_addr_t offset = 0;
1010
1011         if (dma_omap15xx())
1012                 offset = p->dma_read(CPC, lch);
1013         else
1014                 offset = p->dma_read(CDAC, lch);
1015
1016         /*
1017          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1018          * read before the DMA controller finished disabling the channel.
1019          */
1020         if (!dma_omap15xx() && offset == 0) {
1021                 offset = p->dma_read(CDAC, lch);
1022                 /*
1023                  * CDAC == 0 indicates that the DMA transfer on the channel has
1024                  * not been started (no data has been transferred so far).
1025                  * Return the programmed destination start address in this case.
1026                  */
1027                 if (unlikely(!offset))
1028                         offset = p->dma_read(CDSA, lch);
1029         }
1030
1031         if (dma_omap1())
1032                 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1033
1034         return offset;
1035 }
1036 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1037
1038 int omap_get_dma_active_status(int lch)
1039 {
1040         return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1041 }
1042 EXPORT_SYMBOL(omap_get_dma_active_status);
1043
1044 int omap_dma_running(void)
1045 {
1046         int lch;
1047
1048         if (dma_omap1())
1049                 if (omap_lcd_dma_running())
1050                         return 1;
1051
1052         for (lch = 0; lch < dma_chan_count; lch++)
1053                 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1054                         return 1;
1055
1056         return 0;
1057 }
1058
1059 /*
1060  * lch_queue DMA will start right after lch_head one is finished.
1061  * For this DMA link to start, you still need to start (see omap_start_dma)
1062  * the first one. That will fire up the entire queue.
1063  */
1064 void omap_dma_link_lch(int lch_head, int lch_queue)
1065 {
1066         if (omap_dma_in_1510_mode()) {
1067                 if (lch_head == lch_queue) {
1068                         p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1069                                                                 CCR, lch_head);
1070                         return;
1071                 }
1072                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1073                 BUG();
1074                 return;
1075         }
1076
1077         if ((dma_chan[lch_head].dev_id == -1) ||
1078             (dma_chan[lch_queue].dev_id == -1)) {
1079                 pr_err("omap_dma: trying to link non requested channels\n");
1080                 dump_stack();
1081         }
1082
1083         dma_chan[lch_head].next_lch = lch_queue;
1084 }
1085 EXPORT_SYMBOL(omap_dma_link_lch);
1086
1087 /*----------------------------------------------------------------------------*/
1088
1089 #ifdef CONFIG_ARCH_OMAP1
1090
1091 static int omap1_dma_handle_ch(int ch)
1092 {
1093         u32 csr;
1094
1095         if (enable_1510_mode && ch >= 6) {
1096                 csr = dma_chan[ch].saved_csr;
1097                 dma_chan[ch].saved_csr = 0;
1098         } else
1099                 csr = p->dma_read(CSR, ch);
1100         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1101                 dma_chan[ch + 6].saved_csr = csr >> 7;
1102                 csr &= 0x7f;
1103         }
1104         if ((csr & 0x3f) == 0)
1105                 return 0;
1106         if (unlikely(dma_chan[ch].dev_id == -1)) {
1107                 pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
1108                         ch, csr);
1109                 return 0;
1110         }
1111         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1112                 pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
1113         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1114                 pr_warn("DMA synchronization event drop occurred with device %d\n",
1115                         dma_chan[ch].dev_id);
1116         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1117                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1118         if (likely(dma_chan[ch].callback != NULL))
1119                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1120
1121         return 1;
1122 }
1123
1124 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1125 {
1126         int ch = ((int) dev_id) - 1;
1127         int handled = 0;
1128
1129         for (;;) {
1130                 int handled_now = 0;
1131
1132                 handled_now += omap1_dma_handle_ch(ch);
1133                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1134                         handled_now += omap1_dma_handle_ch(ch + 6);
1135                 if (!handled_now)
1136                         break;
1137                 handled += handled_now;
1138         }
1139
1140         return handled ? IRQ_HANDLED : IRQ_NONE;
1141 }
1142
1143 #else
1144 #define omap1_dma_irq_handler   NULL
1145 #endif
1146
1147 #ifdef CONFIG_ARCH_OMAP2PLUS
1148
1149 static int omap2_dma_handle_ch(int ch)
1150 {
1151         u32 status = p->dma_read(CSR, ch);
1152
1153         if (!status) {
1154                 if (printk_ratelimit())
1155                         pr_warn("Spurious DMA IRQ for lch %d\n", ch);
1156                 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1157                 return 0;
1158         }
1159         if (unlikely(dma_chan[ch].dev_id == -1)) {
1160                 if (printk_ratelimit())
1161                         pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
1162                                 status, ch);
1163                 return 0;
1164         }
1165         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1166                 pr_info("DMA synchronization event drop occurred with device %d\n",
1167                         dma_chan[ch].dev_id);
1168         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1169                 printk(KERN_INFO "DMA transaction error with device %d\n",
1170                        dma_chan[ch].dev_id);
1171                 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1172                         u32 ccr;
1173
1174                         ccr = p->dma_read(CCR, ch);
1175                         ccr &= ~OMAP_DMA_CCR_EN;
1176                         p->dma_write(ccr, CCR, ch);
1177                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1178                 }
1179         }
1180         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1181                 printk(KERN_INFO "DMA secure error with device %d\n",
1182                        dma_chan[ch].dev_id);
1183         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1184                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1185                        dma_chan[ch].dev_id);
1186
1187         p->dma_write(status, CSR, ch);
1188         p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1189         /* read back the register to flush the write */
1190         p->dma_read(IRQSTATUS_L0, ch);
1191
1192         /* If the ch is not chained then chain_id will be -1 */
1193         if (dma_chan[ch].chain_id != -1) {
1194                 int chain_id = dma_chan[ch].chain_id;
1195                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1196                 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1197                         dma_chan[dma_chan[ch].next_linked_ch].state =
1198                                                         DMA_CH_STARTED;
1199                 if (dma_linked_lch[chain_id].chain_mode ==
1200                                                 OMAP_DMA_DYNAMIC_CHAIN)
1201                         disable_lnk(ch);
1202
1203                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1204                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1205
1206                 status = p->dma_read(CSR, ch);
1207                 p->dma_write(status, CSR, ch);
1208         }
1209
1210         if (likely(dma_chan[ch].callback != NULL))
1211                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1212
1213         return 0;
1214 }
1215
1216 /* STATUS register count is from 1-32 while our is 0-31 */
1217 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1218 {
1219         u32 val, enable_reg;
1220         int i;
1221
1222         val = p->dma_read(IRQSTATUS_L0, 0);
1223         if (val == 0) {
1224                 if (printk_ratelimit())
1225                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1226                 return IRQ_HANDLED;
1227         }
1228         enable_reg = p->dma_read(IRQENABLE_L0, 0);
1229         val &= enable_reg; /* Dispatch only relevant interrupts */
1230         for (i = 0; i < dma_lch_count && val != 0; i++) {
1231                 if (val & 1)
1232                         omap2_dma_handle_ch(i);
1233                 val >>= 1;
1234         }
1235
1236         return IRQ_HANDLED;
1237 }
1238
1239 static struct irqaction omap24xx_dma_irq = {
1240         .name = "DMA",
1241         .handler = omap2_dma_irq_handler,
1242 };
1243
1244 #else
1245 static struct irqaction omap24xx_dma_irq;
1246 #endif
1247
1248 /*----------------------------------------------------------------------------*/
1249
1250 /*
1251  * Note that we are currently using only IRQENABLE_L0 and L1.
1252  * As the DSP may be using IRQENABLE_L2 and L3, let's not
1253  * touch those for now.
1254  */
1255 void omap_dma_global_context_save(void)
1256 {
1257         omap_dma_global_context.dma_irqenable_l0 =
1258                 p->dma_read(IRQENABLE_L0, 0);
1259         omap_dma_global_context.dma_irqenable_l1 =
1260                 p->dma_read(IRQENABLE_L1, 0);
1261         omap_dma_global_context.dma_ocp_sysconfig =
1262                 p->dma_read(OCP_SYSCONFIG, 0);
1263         omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1264 }
1265
1266 void omap_dma_global_context_restore(void)
1267 {
1268         int ch;
1269
1270         p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1271         p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1272                 OCP_SYSCONFIG, 0);
1273         p->dma_write(omap_dma_global_context.dma_irqenable_l0,
1274                 IRQENABLE_L0, 0);
1275         p->dma_write(omap_dma_global_context.dma_irqenable_l1,
1276                 IRQENABLE_L1, 0);
1277
1278         if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
1279                 p->dma_write(0x3 , IRQSTATUS_L0, 0);
1280
1281         for (ch = 0; ch < dma_chan_count; ch++)
1282                 if (dma_chan[ch].dev_id != -1)
1283                         omap_clear_dma(ch);
1284 }
1285
1286 struct omap_system_dma_plat_info *omap_get_plat_info(void)
1287 {
1288         return p;
1289 }
1290 EXPORT_SYMBOL_GPL(omap_get_plat_info);
1291
1292 static int omap_system_dma_probe(struct platform_device *pdev)
1293 {
1294         int ch, ret = 0;
1295         int dma_irq;
1296         char irq_name[4];
1297         int irq_rel;
1298
1299         p = pdev->dev.platform_data;
1300         if (!p) {
1301                 dev_err(&pdev->dev,
1302                         "%s: System DMA initialized without platform data\n",
1303                         __func__);
1304                 return -EINVAL;
1305         }
1306
1307         d                       = p->dma_attr;
1308         errata                  = p->errata;
1309
1310         if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
1311                         && (omap_dma_reserve_channels < d->lch_count))
1312                 d->lch_count    = omap_dma_reserve_channels;
1313
1314         dma_lch_count           = d->lch_count;
1315         dma_chan_count          = dma_lch_count;
1316         enable_1510_mode        = d->dev_caps & ENABLE_1510_MODE;
1317
1318         dma_chan = devm_kcalloc(&pdev->dev, dma_lch_count,
1319                                 sizeof(*dma_chan), GFP_KERNEL);
1320         if (!dma_chan)
1321                 return -ENOMEM;
1322
1323         if (dma_omap2plus()) {
1324                 dma_linked_lch = kcalloc(dma_lch_count,
1325                                          sizeof(*dma_linked_lch),
1326                                          GFP_KERNEL);
1327                 if (!dma_linked_lch) {
1328                         ret = -ENOMEM;
1329                         goto exit_dma_lch_fail;
1330                 }
1331         }
1332
1333         spin_lock_init(&dma_chan_lock);
1334         for (ch = 0; ch < dma_chan_count; ch++) {
1335                 omap_clear_dma(ch);
1336                 if (dma_omap2plus())
1337                         omap2_disable_irq_lch(ch);
1338
1339                 dma_chan[ch].dev_id = -1;
1340                 dma_chan[ch].next_lch = -1;
1341
1342                 if (ch >= 6 && enable_1510_mode)
1343                         continue;
1344
1345                 if (dma_omap1()) {
1346                         /*
1347                          * request_irq() doesn't like dev_id (ie. ch) being
1348                          * zero, so we have to kludge around this.
1349                          */
1350                         sprintf(&irq_name[0], "%d", ch);
1351                         dma_irq = platform_get_irq_byname(pdev, irq_name);
1352
1353                         if (dma_irq < 0) {
1354                                 ret = dma_irq;
1355                                 goto exit_dma_irq_fail;
1356                         }
1357
1358                         /* INT_DMA_LCD is handled in lcd_dma.c */
1359                         if (dma_irq == INT_DMA_LCD)
1360                                 continue;
1361
1362                         ret = request_irq(dma_irq,
1363                                         omap1_dma_irq_handler, 0, "DMA",
1364                                         (void *) (ch + 1));
1365                         if (ret != 0)
1366                                 goto exit_dma_irq_fail;
1367                 }
1368         }
1369
1370         if (d->dev_caps & IS_RW_PRIORITY)
1371                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
1372                                 DMA_DEFAULT_FIFO_DEPTH, 0);
1373
1374         if (dma_omap2plus() && !(d->dev_caps & DMA_ENGINE_HANDLE_IRQ)) {
1375                 strcpy(irq_name, "0");
1376                 dma_irq = platform_get_irq_byname(pdev, irq_name);
1377                 if (dma_irq < 0) {
1378                         dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
1379                         ret = dma_irq;
1380                         goto exit_dma_lch_fail;
1381                 }
1382                 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
1383                 if (ret) {
1384                         dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
1385                                 dma_irq, ret);
1386                         goto exit_dma_lch_fail;
1387                 }
1388         }
1389
1390         /* reserve dma channels 0 and 1 in high security devices on 34xx */
1391         if (d->dev_caps & HS_CHANNELS_RESERVED) {
1392                 pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
1393                 dma_chan[0].dev_id = 0;
1394                 dma_chan[1].dev_id = 1;
1395         }
1396         p->show_dma_caps();
1397         return 0;
1398
1399 exit_dma_irq_fail:
1400         dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
1401                 dma_irq, ret);
1402         for (irq_rel = 0; irq_rel < ch; irq_rel++) {
1403                 dma_irq = platform_get_irq(pdev, irq_rel);
1404                 free_irq(dma_irq, (void *)(irq_rel + 1));
1405         }
1406
1407 exit_dma_lch_fail:
1408         return ret;
1409 }
1410
1411 static int omap_system_dma_remove(struct platform_device *pdev)
1412 {
1413         int dma_irq;
1414
1415         if (dma_omap2plus()) {
1416                 char irq_name[4];
1417                 strcpy(irq_name, "0");
1418                 dma_irq = platform_get_irq_byname(pdev, irq_name);
1419                 if (dma_irq >= 0)
1420                         remove_irq(dma_irq, &omap24xx_dma_irq);
1421         } else {
1422                 int irq_rel = 0;
1423                 for ( ; irq_rel < dma_chan_count; irq_rel++) {
1424                         dma_irq = platform_get_irq(pdev, irq_rel);
1425                         free_irq(dma_irq, (void *)(irq_rel + 1));
1426                 }
1427         }
1428         return 0;
1429 }
1430
1431 static struct platform_driver omap_system_dma_driver = {
1432         .probe          = omap_system_dma_probe,
1433         .remove         = omap_system_dma_remove,
1434         .driver         = {
1435                 .name   = "omap_dma_system"
1436         },
1437 };
1438
1439 static int __init omap_system_dma_init(void)
1440 {
1441         return platform_driver_register(&omap_system_dma_driver);
1442 }
1443 arch_initcall(omap_system_dma_init);
1444
1445 static void __exit omap_system_dma_exit(void)
1446 {
1447         platform_driver_unregister(&omap_system_dma_driver);
1448 }
1449
1450 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
1451 MODULE_LICENSE("GPL");
1452 MODULE_ALIAS("platform:" DRIVER_NAME);
1453 MODULE_AUTHOR("Texas Instruments Inc");
1454
1455 /*
1456  * Reserve the omap SDMA channels using cmdline bootarg
1457  * "omap_dma_reserve_ch=". The valid range is 1 to 32
1458  */
1459 static int __init omap_dma_cmdline_reserve_ch(char *str)
1460 {
1461         if (get_option(&str, &omap_dma_reserve_channels) != 1)
1462                 omap_dma_reserve_channels = 0;
1463         return 1;
1464 }
1465
1466 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
1467
1468