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 <asm/system.h>
  40 #include <mach/hardware.h>
  41 #include <plat/dma.h>
  42
  43 #include <plat/tc.h>
  44
  45 #undef DEBUG
  46
  47 #ifndef CONFIG_ARCH_OMAP1
  48 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
  49         DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
  50 };
  51
  52 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
  53 #endif
  54
  55 #define OMAP_DMA_ACTIVE                 0x01
  56 #define OMAP2_DMA_CSR_CLEAR_MASK        0xffffffff
  57
  58 #define OMAP_FUNC_MUX_ARM_BASE          (0xfffe1000 + 0xec)
  59
  60 static struct omap_system_dma_plat_info *p;
  61 static struct omap_dma_dev_attr *d;
  62
  63 static int enable_1510_mode;
  64 static u32 errata;
  65
  66 static struct omap_dma_global_context_registers {
  67         u32 dma_irqenable_l0;
  68         u32 dma_ocp_sysconfig;
  69         u32 dma_gcr;
  70 } omap_dma_global_context;
  71
  72 struct dma_link_info {
  73         int *linked_dmach_q;
  74         int no_of_lchs_linked;
  75
  76         int q_count;
  77         int q_tail;
  78         int q_head;
  79
  80         int chain_state;
  81         int chain_mode;
  82
  83 };
  84
  85 static struct dma_link_info *dma_linked_lch;
  86
  87 #ifndef CONFIG_ARCH_OMAP1
  88
  89 /* Chain handling macros */
  90 #define OMAP_DMA_CHAIN_QINIT(chain_id)                                  \
  91         do {                                                            \
  92                 dma_linked_lch[chain_id].q_head =                       \
  93                 dma_linked_lch[chain_id].q_tail =                       \
  94                 dma_linked_lch[chain_id].q_count = 0;                   \
  95         } while (0)
  96 #define OMAP_DMA_CHAIN_QFULL(chain_id)                                  \
  97                 (dma_linked_lch[chain_id].no_of_lchs_linked ==          \
  98                 dma_linked_lch[chain_id].q_count)
  99 #define OMAP_DMA_CHAIN_QLAST(chain_id)                                  \
 100         do {                                                            \
 101                 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==      \
 102                 dma_linked_lch[chain_id].q_count)                       \
 103         } while (0)
 104 #define OMAP_DMA_CHAIN_QEMPTY(chain_id)                                 \
 105                 (0 == dma_linked_lch[chain_id].q_count)
 106 #define __OMAP_DMA_CHAIN_INCQ(end)                                      \
 107         ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
 108 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id)                               \
 109         do {                                                            \
 110                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
 111                 dma_linked_lch[chain_id].q_count--;                     \
 112         } while (0)
 113
 114 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id)                               \
 115         do {                                                            \
 116                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
 117                 dma_linked_lch[chain_id].q_count++; \
 118         } while (0)
 119 #endif
 120
 121 static int dma_lch_count;
 122 static int dma_chan_count;
 123 static int omap_dma_reserve_channels;
 124
 125 static spinlock_t dma_chan_lock;
 126 static struct omap_dma_lch *dma_chan;
 127
 128 static inline void disable_lnk(int lch);
 129 static void omap_disable_channel_irq(int lch);
 130 static inline void omap_enable_channel_irq(int lch);
 131
 132 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 133                                                 __func__);
 134
 135 #ifdef CONFIG_ARCH_OMAP15XX
 136 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 137 static int omap_dma_in_1510_mode(void)
 138 {
 139         return enable_1510_mode;
 140 }
 141 #else
 142 #define omap_dma_in_1510_mode()         0
 143 #endif
 144
 145 #ifdef CONFIG_ARCH_OMAP1
 146 static inline int get_gdma_dev(int req)
 147 {
 148         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 149         int shift = ((req - 1) % 5) * 6;
 150
 151         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
 152 }
 153
 154 static inline void set_gdma_dev(int req, int dev)
 155 {
 156         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 157         int shift = ((req - 1) % 5) * 6;
 158         u32 l;
 159
 160         l = omap_readl(reg);
 161         l &= ~(0x3f << shift);
 162         l |= (dev - 1) << shift;
 163         omap_writel(l, reg);
 164 }
 165 #else
 166 #define set_gdma_dev(req, dev)  do {} while (0)
 167 #endif
 168
 169 void omap_set_dma_priority(int lch, int dst_port, int priority)
 170 {
 171         unsigned long reg;
 172         u32 l;
 173
 174         if (cpu_class_is_omap1()) {
 175                 switch (dst_port) {
 176                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 177                         reg = OMAP_TC_OCPT1_PRIOR;
 178                         break;
 179                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 180                         reg = OMAP_TC_OCPT2_PRIOR;
 181                         break;
 182                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 183                         reg = OMAP_TC_EMIFF_PRIOR;
 184                         break;
 185                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 186                         reg = OMAP_TC_EMIFS_PRIOR;
 187                         break;
 188                 default:
 189                         BUG();
 190                         return;
 191                 }
 192                 l = omap_readl(reg);
 193                 l &= ~(0xf << 8);
 194                 l |= (priority & 0xf) << 8;
 195                 omap_writel(l, reg);
 196         }
 197
 198         if (cpu_class_is_omap2()) {
 199                 u32 ccr;
 200
 201                 ccr = p->dma_read(CCR, lch);
 202                 if (priority)
 203                         ccr |= (1 << 6);
 204                 else
 205                         ccr &= ~(1 << 6);
 206                 p->dma_write(ccr, CCR, lch);
 207         }
 208 }
 209 EXPORT_SYMBOL(omap_set_dma_priority);
 210
 211 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 212                                   int frame_count, int sync_mode,
 213                                   int dma_trigger, int src_or_dst_synch)
 214 {
 215         u32 l;
 216
 217         l = p->dma_read(CSDP, lch);
 218         l &= ~0x03;
 219         l |= data_type;
 220         p->dma_write(l, CSDP, lch);
 221
 222         if (cpu_class_is_omap1()) {
 223                 u16 ccr;
 224
 225                 ccr = p->dma_read(CCR, lch);
 226                 ccr &= ~(1 << 5);
 227                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 228                         ccr |= 1 << 5;
 229                 p->dma_write(ccr, CCR, lch);
 230
 231                 ccr = p->dma_read(CCR2, lch);
 232                 ccr &= ~(1 << 2);
 233                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 234                         ccr |= 1 << 2;
 235                 p->dma_write(ccr, CCR2, lch);
 236         }
 237
 238         if (cpu_class_is_omap2() && dma_trigger) {
 239                 u32 val;
 240
 241                 val = p->dma_read(CCR, lch);
 242
 243                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 244                 val &= ~((1 << 23) | (3 << 19) | 0x1f);
 245                 val |= (dma_trigger & ~0x1f) << 14;
 246                 val |= dma_trigger & 0x1f;
 247
 248                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 249                         val |= 1 << 5;
 250                 else
 251                         val &= ~(1 << 5);
 252
 253                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 254                         val |= 1 << 18;
 255                 else
 256                         val &= ~(1 << 18);
 257
 258                 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
 259                         val &= ~(1 << 24);      /* dest synch */
 260                         val |= (1 << 23);       /* Prefetch */
 261                 } else if (src_or_dst_synch) {
 262                         val |= 1 << 24;         /* source synch */
 263                 } else {
 264                         val &= ~(1 << 24);      /* dest synch */
 265                 }
 266                 p->dma_write(val, CCR, lch);
 267         }
 268
 269         p->dma_write(elem_count, CEN, lch);
 270         p->dma_write(frame_count, CFN, lch);
 271 }
 272 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 273
 274 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 275 {
 276         BUG_ON(omap_dma_in_1510_mode());
 277
 278         if (cpu_class_is_omap1()) {
 279                 u16 w;
 280
 281                 w = p->dma_read(CCR2, lch);
 282                 w &= ~0x03;
 283
 284                 switch (mode) {
 285                 case OMAP_DMA_CONSTANT_FILL:
 286                         w |= 0x01;
 287                         break;
 288                 case OMAP_DMA_TRANSPARENT_COPY:
 289                         w |= 0x02;
 290                         break;
 291                 case OMAP_DMA_COLOR_DIS:
 292                         break;
 293                 default:
 294                         BUG();
 295                 }
 296                 p->dma_write(w, CCR2, lch);
 297
 298                 w = p->dma_read(LCH_CTRL, lch);
 299                 w &= ~0x0f;
 300                 /* Default is channel type 2D */
 301                 if (mode) {
 302                         p->dma_write(color, COLOR, lch);
 303                         w |= 1;         /* Channel type G */
 304                 }
 305                 p->dma_write(w, LCH_CTRL, lch);
 306         }
 307
 308         if (cpu_class_is_omap2()) {
 309                 u32 val;
 310
 311                 val = p->dma_read(CCR, lch);
 312                 val &= ~((1 << 17) | (1 << 16));
 313
 314                 switch (mode) {
 315                 case OMAP_DMA_CONSTANT_FILL:
 316                         val |= 1 << 16;
 317                         break;
 318                 case OMAP_DMA_TRANSPARENT_COPY:
 319                         val |= 1 << 17;
 320                         break;
 321                 case OMAP_DMA_COLOR_DIS:
 322                         break;
 323                 default:
 324                         BUG();
 325                 }
 326                 p->dma_write(val, CCR, lch);
 327
 328                 color &= 0xffffff;
 329                 p->dma_write(color, COLOR, lch);
 330         }
 331 }
 332 EXPORT_SYMBOL(omap_set_dma_color_mode);
 333
 334 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 335 {
 336         if (cpu_class_is_omap2()) {
 337                 u32 csdp;
 338
 339                 csdp = p->dma_read(CSDP, lch);
 340                 csdp &= ~(0x3 << 16);
 341                 csdp |= (mode << 16);
 342                 p->dma_write(csdp, CSDP, lch);
 343         }
 344 }
 345 EXPORT_SYMBOL(omap_set_dma_write_mode);
 346
 347 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 348 {
 349         if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
 350                 u32 l;
 351
 352                 l = p->dma_read(LCH_CTRL, lch);
 353                 l &= ~0x7;
 354                 l |= mode;
 355                 p->dma_write(l, LCH_CTRL, lch);
 356         }
 357 }
 358 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 359
 360 /* Note that src_port is only for omap1 */
 361 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 362                              unsigned long src_start,
 363                              int src_ei, int src_fi)
 364 {
 365         u32 l;
 366
 367         if (cpu_class_is_omap1()) {
 368                 u16 w;
 369
 370                 w = p->dma_read(CSDP, lch);
 371                 w &= ~(0x1f << 2);
 372                 w |= src_port << 2;
 373                 p->dma_write(w, CSDP, lch);
 374         }
 375
 376         l = p->dma_read(CCR, lch);
 377         l &= ~(0x03 << 12);
 378         l |= src_amode << 12;
 379         p->dma_write(l, CCR, lch);
 380
 381         p->dma_write(src_start, CSSA, lch);
 382
 383         p->dma_write(src_ei, CSEI, lch);
 384         p->dma_write(src_fi, CSFI, lch);
 385 }
 386 EXPORT_SYMBOL(omap_set_dma_src_params);
 387
 388 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 389 {
 390         omap_set_dma_transfer_params(lch, params->data_type,
 391                                      params->elem_count, params->frame_count,
 392                                      params->sync_mode, params->trigger,
 393                                      params->src_or_dst_synch);
 394         omap_set_dma_src_params(lch, params->src_port,
 395                                 params->src_amode, params->src_start,
 396                                 params->src_ei, params->src_fi);
 397
 398         omap_set_dma_dest_params(lch, params->dst_port,
 399                                  params->dst_amode, params->dst_start,
 400                                  params->dst_ei, params->dst_fi);
 401         if (params->read_prio || params->write_prio)
 402                 omap_dma_set_prio_lch(lch, params->read_prio,
 403                                       params->write_prio);
 404 }
 405 EXPORT_SYMBOL(omap_set_dma_params);
 406
 407 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 408 {
 409         if (cpu_class_is_omap2())
 410                 return;
 411
 412         p->dma_write(eidx, CSEI, lch);
 413         p->dma_write(fidx, CSFI, lch);
 414 }
 415 EXPORT_SYMBOL(omap_set_dma_src_index);
 416
 417 void omap_set_dma_src_data_pack(int lch, int enable)
 418 {
 419         u32 l;
 420
 421         l = p->dma_read(CSDP, lch);
 422         l &= ~(1 << 6);
 423         if (enable)
 424                 l |= (1 << 6);
 425         p->dma_write(l, CSDP, lch);
 426 }
 427 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 428
 429 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 430 {
 431         unsigned int burst = 0;
 432         u32 l;
 433
 434         l = p->dma_read(CSDP, lch);
 435         l &= ~(0x03 << 7);
 436
 437         switch (burst_mode) {
 438         case OMAP_DMA_DATA_BURST_DIS:
 439                 break;
 440         case OMAP_DMA_DATA_BURST_4:
 441                 if (cpu_class_is_omap2())
 442                         burst = 0x1;
 443                 else
 444                         burst = 0x2;
 445                 break;
 446         case OMAP_DMA_DATA_BURST_8:
 447                 if (cpu_class_is_omap2()) {
 448                         burst = 0x2;
 449                         break;
 450                 }
 451                 /*
 452                  * not supported by current hardware on OMAP1
 453                  * w |= (0x03 << 7);
 454                  * fall through
 455                  */
 456         case OMAP_DMA_DATA_BURST_16:
 457                 if (cpu_class_is_omap2()) {
 458                         burst = 0x3;
 459                         break;
 460                 }
 461                 /*
 462                  * OMAP1 don't support burst 16
 463                  * fall through
 464                  */
 465         default:
 466                 BUG();
 467         }
 468
 469         l |= (burst << 7);
 470         p->dma_write(l, CSDP, lch);
 471 }
 472 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 473
 474 /* Note that dest_port is only for OMAP1 */
 475 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 476                               unsigned long dest_start,
 477                               int dst_ei, int dst_fi)
 478 {
 479         u32 l;
 480
 481         if (cpu_class_is_omap1()) {
 482                 l = p->dma_read(CSDP, lch);
 483                 l &= ~(0x1f << 9);
 484                 l |= dest_port << 9;
 485                 p->dma_write(l, CSDP, lch);
 486         }
 487
 488         l = p->dma_read(CCR, lch);
 489         l &= ~(0x03 << 14);
 490         l |= dest_amode << 14;
 491         p->dma_write(l, CCR, lch);
 492
 493         p->dma_write(dest_start, CDSA, lch);
 494
 495         p->dma_write(dst_ei, CDEI, lch);
 496         p->dma_write(dst_fi, CDFI, lch);
 497 }
 498 EXPORT_SYMBOL(omap_set_dma_dest_params);
 499
 500 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 501 {
 502         if (cpu_class_is_omap2())
 503                 return;
 504
 505         p->dma_write(eidx, CDEI, lch);
 506         p->dma_write(fidx, CDFI, lch);
 507 }
 508 EXPORT_SYMBOL(omap_set_dma_dest_index);
 509
 510 void omap_set_dma_dest_data_pack(int lch, int enable)
 511 {
 512         u32 l;
 513
 514         l = p->dma_read(CSDP, lch);
 515         l &= ~(1 << 13);
 516         if (enable)
 517                 l |= 1 << 13;
 518         p->dma_write(l, CSDP, lch);
 519 }
 520 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 521
 522 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 523 {
 524         unsigned int burst = 0;
 525         u32 l;
 526
 527         l = p->dma_read(CSDP, lch);
 528         l &= ~(0x03 << 14);
 529
 530         switch (burst_mode) {
 531         case OMAP_DMA_DATA_BURST_DIS:
 532                 break;
 533         case OMAP_DMA_DATA_BURST_4:
 534                 if (cpu_class_is_omap2())
 535                         burst = 0x1;
 536                 else
 537                         burst = 0x2;
 538                 break;
 539         case OMAP_DMA_DATA_BURST_8:
 540                 if (cpu_class_is_omap2())
 541                         burst = 0x2;
 542                 else
 543                         burst = 0x3;
 544                 break;
 545         case OMAP_DMA_DATA_BURST_16:
 546                 if (cpu_class_is_omap2()) {
 547                         burst = 0x3;
 548                         break;
 549                 }
 550                 /*
 551                  * OMAP1 don't support burst 16
 552                  * fall through
 553                  */
 554         default:
 555                 printk(KERN_ERR "Invalid DMA burst mode\n");
 556                 BUG();
 557                 return;
 558         }
 559         l |= (burst << 14);
 560         p->dma_write(l, CSDP, lch);
 561 }
 562 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 563
 564 static inline void omap_enable_channel_irq(int lch)
 565 {
 566         u32 status;
 567
 568         /* Clear CSR */
 569         if (cpu_class_is_omap1())
 570                 status = p->dma_read(CSR, lch);
 571         else if (cpu_class_is_omap2())
 572                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 573
 574         /* Enable some nice interrupts. */
 575         p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
 576 }
 577
 578 static void omap_disable_channel_irq(int lch)
 579 {
 580         if (cpu_class_is_omap2())
 581                 p->dma_write(0, CICR, lch);
 582 }
 583
 584 void omap_enable_dma_irq(int lch, u16 bits)
 585 {
 586         dma_chan[lch].enabled_irqs |= bits;
 587 }
 588 EXPORT_SYMBOL(omap_enable_dma_irq);
 589
 590 void omap_disable_dma_irq(int lch, u16 bits)
 591 {
 592         dma_chan[lch].enabled_irqs &= ~bits;
 593 }
 594 EXPORT_SYMBOL(omap_disable_dma_irq);
 595
 596 static inline void enable_lnk(int lch)
 597 {
 598         u32 l;
 599
 600         l = p->dma_read(CLNK_CTRL, lch);
 601
 602         if (cpu_class_is_omap1())
 603                 l &= ~(1 << 14);
 604
 605         /* Set the ENABLE_LNK bits */
 606         if (dma_chan[lch].next_lch != -1)
 607                 l = dma_chan[lch].next_lch | (1 << 15);
 608
 609 #ifndef CONFIG_ARCH_OMAP1
 610         if (cpu_class_is_omap2())
 611                 if (dma_chan[lch].next_linked_ch != -1)
 612                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 613 #endif
 614
 615         p->dma_write(l, CLNK_CTRL, lch);
 616 }
 617
 618 static inline void disable_lnk(int lch)
 619 {
 620         u32 l;
 621
 622         l = p->dma_read(CLNK_CTRL, lch);
 623
 624         /* Disable interrupts */
 625         if (cpu_class_is_omap1()) {
 626                 p->dma_write(0, CICR, lch);
 627                 /* Set the STOP_LNK bit */
 628                 l |= 1 << 14;
 629         }
 630
 631         if (cpu_class_is_omap2()) {
 632                 omap_disable_channel_irq(lch);
 633                 /* Clear the ENABLE_LNK bit */
 634                 l &= ~(1 << 15);
 635         }
 636
 637         p->dma_write(l, CLNK_CTRL, lch);
 638         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 639 }
 640
 641 static inline void omap2_enable_irq_lch(int lch)
 642 {
 643         u32 val;
 644         unsigned long flags;
 645
 646         if (!cpu_class_is_omap2())
 647                 return;
 648
 649         spin_lock_irqsave(&dma_chan_lock, flags);
 650         val = p->dma_read(IRQENABLE_L0, lch);
 651         val |= 1 << lch;
 652         p->dma_write(val, IRQENABLE_L0, lch);
 653         spin_unlock_irqrestore(&dma_chan_lock, flags);
 654 }
 655
 656 static inline void omap2_disable_irq_lch(int lch)
 657 {
 658         u32 val;
 659         unsigned long flags;
 660
 661         if (!cpu_class_is_omap2())
 662                 return;
 663
 664         spin_lock_irqsave(&dma_chan_lock, flags);
 665         val = p->dma_read(IRQENABLE_L0, lch);
 666         val &= ~(1 << lch);
 667         p->dma_write(val, IRQENABLE_L0, lch);
 668         spin_unlock_irqrestore(&dma_chan_lock, flags);
 669 }
 670
 671 int omap_request_dma(int dev_id, const char *dev_name,
 672                      void (*callback)(int lch, u16 ch_status, void *data),
 673                      void *data, int *dma_ch_out)
 674 {
 675         int ch, free_ch = -1;
 676         unsigned long flags;
 677         struct omap_dma_lch *chan;
 678
 679         spin_lock_irqsave(&dma_chan_lock, flags);
 680         for (ch = 0; ch < dma_chan_count; ch++) {
 681                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 682                         free_ch = ch;
 683                         if (dev_id == 0)
 684                                 break;
 685                 }
 686         }
 687         if (free_ch == -1) {
 688                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 689                 return -EBUSY;
 690         }
 691         chan = dma_chan + free_ch;
 692         chan->dev_id = dev_id;
 693
 694         if (p->clear_lch_regs)
 695                 p->clear_lch_regs(free_ch);
 696
 697         if (cpu_class_is_omap2())
 698                 omap_clear_dma(free_ch);
 699
 700         spin_unlock_irqrestore(&dma_chan_lock, flags);
 701
 702         chan->dev_name = dev_name;
 703         chan->callback = callback;
 704         chan->data = data;
 705         chan->flags = 0;
 706
 707 #ifndef CONFIG_ARCH_OMAP1
 708         if (cpu_class_is_omap2()) {
 709                 chan->chain_id = -1;
 710                 chan->next_linked_ch = -1;
 711         }
 712 #endif
 713
 714         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 715
 716         if (cpu_class_is_omap1())
 717                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 718         else if (cpu_class_is_omap2())
 719                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 720                         OMAP2_DMA_TRANS_ERR_IRQ;
 721
 722         if (cpu_is_omap16xx()) {
 723                 /* If the sync device is set, configure it dynamically. */
 724                 if (dev_id != 0) {
 725                         set_gdma_dev(free_ch + 1, dev_id);
 726                         dev_id = free_ch + 1;
 727                 }
 728                 /*
 729                  * Disable the 1510 compatibility mode and set the sync device
 730                  * id.
 731                  */
 732                 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
 733         } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
 734                 p->dma_write(dev_id, CCR, free_ch);
 735         }
 736
 737         if (cpu_class_is_omap2()) {
 738                 omap2_enable_irq_lch(free_ch);
 739                 omap_enable_channel_irq(free_ch);
 740                 /* Clear the CSR register and IRQ status register */
 741                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, free_ch);
 742                 p->dma_write(1 << free_ch, IRQSTATUS_L0, 0);
 743         }
 744
 745         *dma_ch_out = free_ch;
 746
 747         return 0;
 748 }
 749 EXPORT_SYMBOL(omap_request_dma);
 750
 751 void omap_free_dma(int lch)
 752 {
 753         unsigned long flags;
 754
 755         if (dma_chan[lch].dev_id == -1) {
 756                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 757                        lch);
 758                 return;
 759         }
 760
 761         if (cpu_class_is_omap1()) {
 762                 /* Disable all DMA interrupts for the channel. */
 763                 p->dma_write(0, CICR, lch);
 764                 /* Make sure the DMA transfer is stopped. */
 765                 p->dma_write(0, CCR, lch);
 766         }
 767
 768         if (cpu_class_is_omap2()) {
 769                 omap2_disable_irq_lch(lch);
 770
 771                 /* Clear the CSR register and IRQ status register */
 772                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 773                 p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 774
 775                 /* Disable all DMA interrupts for the channel. */
 776                 p->dma_write(0, CICR, lch);
 777
 778                 /* Make sure the DMA transfer is stopped. */
 779                 p->dma_write(0, CCR, lch);
 780                 omap_clear_dma(lch);
 781         }
 782
 783         spin_lock_irqsave(&dma_chan_lock, flags);
 784         dma_chan[lch].dev_id = -1;
 785         dma_chan[lch].next_lch = -1;
 786         dma_chan[lch].callback = NULL;
 787         spin_unlock_irqrestore(&dma_chan_lock, flags);
 788 }
 789 EXPORT_SYMBOL(omap_free_dma);
 790
 791 /**
 792  * @brief omap_dma_set_global_params : Set global priority settings for dma
 793  *
 794  * @param arb_rate
 795  * @param max_fifo_depth
 796  * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
 797  *                                                 DMA_THREAD_RESERVE_ONET
 798  *                                                 DMA_THREAD_RESERVE_TWOT
 799  *                                                 DMA_THREAD_RESERVE_THREET
 800  */
 801 void
 802 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 803 {
 804         u32 reg;
 805
 806         if (!cpu_class_is_omap2()) {
 807                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 808                 return;
 809         }
 810
 811         if (max_fifo_depth == 0)
 812                 max_fifo_depth = 1;
 813         if (arb_rate == 0)
 814                 arb_rate = 1;
 815
 816         reg = 0xff & max_fifo_depth;
 817         reg |= (0x3 & tparams) << 12;
 818         reg |= (arb_rate & 0xff) << 16;
 819
 820         p->dma_write(reg, GCR, 0);
 821 }
 822 EXPORT_SYMBOL(omap_dma_set_global_params);
 823
 824 /**
 825  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 826  *
 827  * @param lch
 828  * @param read_prio - Read priority
 829  * @param write_prio - Write priority
 830  * Both of the above can be set with one of the following values :
 831  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 832  */
 833 int
 834 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 835                       unsigned char write_prio)
 836 {
 837         u32 l;
 838
 839         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 840                 printk(KERN_ERR "Invalid channel id\n");
 841                 return -EINVAL;
 842         }
 843         l = p->dma_read(CCR, lch);
 844         l &= ~((1 << 6) | (1 << 26));
 845         if (cpu_is_omap2430() || cpu_is_omap34xx() ||  cpu_is_omap44xx())
 846                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 847         else
 848                 l |= ((read_prio & 0x1) << 6);
 849
 850         p->dma_write(l, CCR, lch);
 851
 852         return 0;
 853 }
 854 EXPORT_SYMBOL(omap_dma_set_prio_lch);
 855
 856 /*
 857  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 858  * through omap_start_dma(). Any buffers in flight are discarded.
 859  */
 860 void omap_clear_dma(int lch)
 861 {
 862         unsigned long flags;
 863
 864         local_irq_save(flags);
 865         p->clear_dma(lch);
 866         local_irq_restore(flags);
 867 }
 868 EXPORT_SYMBOL(omap_clear_dma);
 869
 870 void omap_start_dma(int lch)
 871 {
 872         u32 l;
 873
 874         /*
 875          * The CPC/CDAC register needs to be initialized to zero
 876          * before starting dma transfer.
 877          */
 878         if (cpu_is_omap15xx())
 879                 p->dma_write(0, CPC, lch);
 880         else
 881                 p->dma_write(0, CDAC, lch);
 882
 883         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 884                 int next_lch, cur_lch;
 885                 char dma_chan_link_map[dma_lch_count];
 886
 887                 dma_chan_link_map[lch] = 1;
 888                 /* Set the link register of the first channel */
 889                 enable_lnk(lch);
 890
 891                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 892                 cur_lch = dma_chan[lch].next_lch;
 893                 do {
 894                         next_lch = dma_chan[cur_lch].next_lch;
 895
 896                         /* The loop case: we've been here already */
 897                         if (dma_chan_link_map[cur_lch])
 898                                 break;
 899                         /* Mark the current channel */
 900                         dma_chan_link_map[cur_lch] = 1;
 901
 902                         enable_lnk(cur_lch);
 903                         omap_enable_channel_irq(cur_lch);
 904
 905                         cur_lch = next_lch;
 906                 } while (next_lch != -1);
 907         } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
 908                 p->dma_write(lch, CLNK_CTRL, lch);
 909
 910         omap_enable_channel_irq(lch);
 911
 912         l = p->dma_read(CCR, lch);
 913
 914         if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
 915                         l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
 916         l |= OMAP_DMA_CCR_EN;
 917
 918         p->dma_write(l, CCR, lch);
 919
 920         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 921 }
 922 EXPORT_SYMBOL(omap_start_dma);
 923
 924 void omap_stop_dma(int lch)
 925 {
 926         u32 l;
 927
 928         /* Disable all interrupts on the channel */
 929         if (cpu_class_is_omap1())
 930                 p->dma_write(0, CICR, lch);
 931
 932         l = p->dma_read(CCR, lch);
 933         if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
 934                         (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
 935                 int i = 0;
 936                 u32 sys_cf;
 937
 938                 /* Configure No-Standby */
 939                 l = p->dma_read(OCP_SYSCONFIG, lch);
 940                 sys_cf = l;
 941                 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
 942                 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
 943                 p->dma_write(l , OCP_SYSCONFIG, 0);
 944
 945                 l = p->dma_read(CCR, lch);
 946                 l &= ~OMAP_DMA_CCR_EN;
 947                 p->dma_write(l, CCR, lch);
 948
 949                 /* Wait for sDMA FIFO drain */
 950                 l = p->dma_read(CCR, lch);
 951                 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
 952                                         OMAP_DMA_CCR_WR_ACTIVE))) {
 953                         udelay(5);
 954                         i++;
 955                         l = p->dma_read(CCR, lch);
 956                 }
 957                 if (i >= 100)
 958                         printk(KERN_ERR "DMA drain did not complete on "
 959                                         "lch %d\n", lch);
 960                 /* Restore OCP_SYSCONFIG */
 961                 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
 962         } else {
 963                 l &= ~OMAP_DMA_CCR_EN;
 964                 p->dma_write(l, CCR, lch);
 965         }
 966
 967         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 968                 int next_lch, cur_lch = lch;
 969                 char dma_chan_link_map[dma_lch_count];
 970
 971                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 972                 do {
 973                         /* The loop case: we've been here already */
 974                         if (dma_chan_link_map[cur_lch])
 975                                 break;
 976                         /* Mark the current channel */
 977                         dma_chan_link_map[cur_lch] = 1;
 978
 979                         disable_lnk(cur_lch);
 980
 981                         next_lch = dma_chan[cur_lch].next_lch;
 982                         cur_lch = next_lch;
 983                 } while (next_lch != -1);
 984         }
 985
 986         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 987 }
 988 EXPORT_SYMBOL(omap_stop_dma);
 989
 990 /*
 991  * Allows changing the DMA callback function or data. This may be needed if
 992  * the driver shares a single DMA channel for multiple dma triggers.
 993  */
 994 int omap_set_dma_callback(int lch,
 995                           void (*callback)(int lch, u16 ch_status, void *data),
 996                           void *data)
 997 {
 998         unsigned long flags;
 999
1000         if (lch < 0)
1001                 return -ENODEV;
1002
1003         spin_lock_irqsave(&dma_chan_lock, flags);
1004         if (dma_chan[lch].dev_id == -1) {
1005                 printk(KERN_ERR "DMA callback for not set for free channel\n");
1006                 spin_unlock_irqrestore(&dma_chan_lock, flags);
1007                 return -EINVAL;
1008         }
1009         dma_chan[lch].callback = callback;
1010         dma_chan[lch].data = data;
1011         spin_unlock_irqrestore(&dma_chan_lock, flags);
1012
1013         return 0;
1014 }
1015 EXPORT_SYMBOL(omap_set_dma_callback);
1016
1017 /*
1018  * Returns current physical source address for the given DMA channel.
1019  * If the channel is running the caller must disable interrupts prior calling
1020  * this function and process the returned value before re-enabling interrupt to
1021  * prevent races with the interrupt handler. Note that in continuous mode there
1022  * is a chance for CSSA_L register overflow between the two reads resulting
1023  * in incorrect return value.
1024  */
1025 dma_addr_t omap_get_dma_src_pos(int lch)
1026 {
1027         dma_addr_t offset = 0;
1028
1029         if (cpu_is_omap15xx())
1030                 offset = p->dma_read(CPC, lch);
1031         else
1032                 offset = p->dma_read(CSAC, lch);
1033
1034         if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
1035                 offset = p->dma_read(CSAC, lch);
1036
1037         if (cpu_class_is_omap1())
1038                 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
1039
1040         return offset;
1041 }
1042 EXPORT_SYMBOL(omap_get_dma_src_pos);
1043
1044 /*
1045  * Returns current physical destination address for the given DMA channel.
1046  * If the channel is running the caller must disable interrupts prior calling
1047  * this function and process the returned value before re-enabling interrupt to
1048  * prevent races with the interrupt handler. Note that in continuous mode there
1049  * is a chance for CDSA_L register overflow between the two reads resulting
1050  * in incorrect return value.
1051  */
1052 dma_addr_t omap_get_dma_dst_pos(int lch)
1053 {
1054         dma_addr_t offset = 0;
1055
1056         if (cpu_is_omap15xx())
1057                 offset = p->dma_read(CPC, lch);
1058         else
1059                 offset = p->dma_read(CDAC, lch);
1060
1061         /*
1062          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1063          * read before the DMA controller finished disabling the channel.
1064          */
1065         if (!cpu_is_omap15xx() && offset == 0)
1066                 offset = p->dma_read(CDAC, lch);
1067
1068         if (cpu_class_is_omap1())
1069                 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1070
1071         return offset;
1072 }
1073 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1074
1075 int omap_get_dma_active_status(int lch)
1076 {
1077         return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1078 }
1079 EXPORT_SYMBOL(omap_get_dma_active_status);
1080
1081 int omap_dma_running(void)
1082 {
1083         int lch;
1084
1085         if (cpu_class_is_omap1())
1086                 if (omap_lcd_dma_running())
1087                         return 1;
1088
1089         for (lch = 0; lch < dma_chan_count; lch++)
1090                 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1091                         return 1;
1092
1093         return 0;
1094 }
1095
1096 /*
1097  * lch_queue DMA will start right after lch_head one is finished.
1098  * For this DMA link to start, you still need to start (see omap_start_dma)
1099  * the first one. That will fire up the entire queue.
1100  */
1101 void omap_dma_link_lch(int lch_head, int lch_queue)
1102 {
1103         if (omap_dma_in_1510_mode()) {
1104                 if (lch_head == lch_queue) {
1105                         p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1106                                                                 CCR, lch_head);
1107                         return;
1108                 }
1109                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1110                 BUG();
1111                 return;
1112         }
1113
1114         if ((dma_chan[lch_head].dev_id == -1) ||
1115             (dma_chan[lch_queue].dev_id == -1)) {
1116                 printk(KERN_ERR "omap_dma: trying to link "
1117                        "non requested channels\n");
1118                 dump_stack();
1119         }
1120
1121         dma_chan[lch_head].next_lch = lch_queue;
1122 }
1123 EXPORT_SYMBOL(omap_dma_link_lch);
1124
1125 /*
1126  * Once the DMA queue is stopped, we can destroy it.
1127  */
1128 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1129 {
1130         if (omap_dma_in_1510_mode()) {
1131                 if (lch_head == lch_queue) {
1132                         p->dma_write(p->dma_read(CCR, lch_head) & ~(3 << 8),
1133                                                                 CCR, lch_head);
1134                         return;
1135                 }
1136                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1137                 BUG();
1138                 return;
1139         }
1140
1141         if (dma_chan[lch_head].next_lch != lch_queue ||
1142             dma_chan[lch_head].next_lch == -1) {
1143                 printk(KERN_ERR "omap_dma: trying to unlink "
1144                        "non linked channels\n");
1145                 dump_stack();
1146         }
1147
1148         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1149             (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1150                 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1151                        "before unlinking\n");
1152                 dump_stack();
1153         }
1154
1155         dma_chan[lch_head].next_lch = -1;
1156 }
1157 EXPORT_SYMBOL(omap_dma_unlink_lch);
1158
1159 #ifndef CONFIG_ARCH_OMAP1
1160 /* Create chain of DMA channesls */
1161 static void create_dma_lch_chain(int lch_head, int lch_queue)
1162 {
1163         u32 l;
1164
1165         /* Check if this is the first link in chain */
1166         if (dma_chan[lch_head].next_linked_ch == -1) {
1167                 dma_chan[lch_head].next_linked_ch = lch_queue;
1168                 dma_chan[lch_head].prev_linked_ch = lch_queue;
1169                 dma_chan[lch_queue].next_linked_ch = lch_head;
1170                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1171         }
1172
1173         /* a link exists, link the new channel in circular chain */
1174         else {
1175                 dma_chan[lch_queue].next_linked_ch =
1176                                         dma_chan[lch_head].next_linked_ch;
1177                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1178                 dma_chan[lch_head].next_linked_ch = lch_queue;
1179                 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1180                                         lch_queue;
1181         }
1182
1183         l = p->dma_read(CLNK_CTRL, lch_head);
1184         l &= ~(0x1f);
1185         l |= lch_queue;
1186         p->dma_write(l, CLNK_CTRL, lch_head);
1187
1188         l = p->dma_read(CLNK_CTRL, lch_queue);
1189         l &= ~(0x1f);
1190         l |= (dma_chan[lch_queue].next_linked_ch);
1191         p->dma_write(l, CLNK_CTRL, lch_queue);
1192 }
1193
1194 /**
1195  * @brief omap_request_dma_chain : Request a chain of DMA channels
1196  *
1197  * @param dev_id - Device id using the dma channel
1198  * @param dev_name - Device name
1199  * @param callback - Call back function
1200  * @chain_id -
1201  * @no_of_chans - Number of channels requested
1202  * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1203  *                                            OMAP_DMA_DYNAMIC_CHAIN
1204  * @params - Channel parameters
1205  *
1206  * @return - Success : 0
1207  *           Failure: -EINVAL/-ENOMEM
1208  */
1209 int omap_request_dma_chain(int dev_id, const char *dev_name,
1210                            void (*callback) (int lch, u16 ch_status,
1211                                              void *data),
1212                            int *chain_id, int no_of_chans, int chain_mode,
1213                            struct omap_dma_channel_params params)
1214 {
1215         int *channels;
1216         int i, err;
1217
1218         /* Is the chain mode valid ? */
1219         if (chain_mode != OMAP_DMA_STATIC_CHAIN
1220                         && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1221                 printk(KERN_ERR "Invalid chain mode requested\n");
1222                 return -EINVAL;
1223         }
1224
1225         if (unlikely((no_of_chans < 1
1226                         || no_of_chans > dma_lch_count))) {
1227                 printk(KERN_ERR "Invalid Number of channels requested\n");
1228                 return -EINVAL;
1229         }
1230
1231         /*
1232          * Allocate a queue to maintain the status of the channels
1233          * in the chain
1234          */
1235         channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1236         if (channels == NULL) {
1237                 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1238                 return -ENOMEM;
1239         }
1240
1241         /* request and reserve DMA channels for the chain */
1242         for (i = 0; i < no_of_chans; i++) {
1243                 err = omap_request_dma(dev_id, dev_name,
1244                                         callback, NULL, &channels[i]);
1245                 if (err < 0) {
1246                         int j;
1247                         for (j = 0; j < i; j++)
1248                                 omap_free_dma(channels[j]);
1249                         kfree(channels);
1250                         printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1251                         return err;
1252                 }
1253                 dma_chan[channels[i]].prev_linked_ch = -1;
1254                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1255
1256                 /*
1257                  * Allowing client drivers to set common parameters now,
1258                  * so that later only relevant (src_start, dest_start
1259                  * and element count) can be set
1260                  */
1261                 omap_set_dma_params(channels[i], &params);
1262         }
1263
1264         *chain_id = channels[0];
1265         dma_linked_lch[*chain_id].linked_dmach_q = channels;
1266         dma_linked_lch[*chain_id].chain_mode = chain_mode;
1267         dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1268         dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1269
1270         for (i = 0; i < no_of_chans; i++)
1271                 dma_chan[channels[i]].chain_id = *chain_id;
1272
1273         /* Reset the Queue pointers */
1274         OMAP_DMA_CHAIN_QINIT(*chain_id);
1275
1276         /* Set up the chain */
1277         if (no_of_chans == 1)
1278                 create_dma_lch_chain(channels[0], channels[0]);
1279         else {
1280                 for (i = 0; i < (no_of_chans - 1); i++)
1281                         create_dma_lch_chain(channels[i], channels[i + 1]);
1282         }
1283
1284         return 0;
1285 }
1286 EXPORT_SYMBOL(omap_request_dma_chain);
1287
1288 /**
1289  * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1290  * params after setting it. Dont do this while dma is running!!
1291  *
1292  * @param chain_id - Chained logical channel id.
1293  * @param params
1294  *
1295  * @return - Success : 0
1296  *           Failure : -EINVAL
1297  */
1298 int omap_modify_dma_chain_params(int chain_id,
1299                                 struct omap_dma_channel_params params)
1300 {
1301         int *channels;
1302         u32 i;
1303
1304         /* Check for input params */
1305         if (unlikely((chain_id < 0
1306                         || chain_id >= dma_lch_count))) {
1307                 printk(KERN_ERR "Invalid chain id\n");
1308                 return -EINVAL;
1309         }
1310
1311         /* Check if the chain exists */
1312         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1313                 printk(KERN_ERR "Chain doesn't exists\n");
1314                 return -EINVAL;
1315         }
1316         channels = dma_linked_lch[chain_id].linked_dmach_q;
1317
1318         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1319                 /*
1320                  * Allowing client drivers to set common parameters now,
1321                  * so that later only relevant (src_start, dest_start
1322                  * and element count) can be set
1323                  */
1324                 omap_set_dma_params(channels[i], &params);
1325         }
1326
1327         return 0;
1328 }
1329 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1330
1331 /**
1332  * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1333  *
1334  * @param chain_id
1335  *
1336  * @return - Success : 0
1337  *           Failure : -EINVAL
1338  */
1339 int omap_free_dma_chain(int chain_id)
1340 {
1341         int *channels;
1342         u32 i;
1343
1344         /* Check for input params */
1345         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1346                 printk(KERN_ERR "Invalid chain id\n");
1347                 return -EINVAL;
1348         }
1349
1350         /* Check if the chain exists */
1351         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1352                 printk(KERN_ERR "Chain doesn't exists\n");
1353                 return -EINVAL;
1354         }
1355
1356         channels = dma_linked_lch[chain_id].linked_dmach_q;
1357         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1358                 dma_chan[channels[i]].next_linked_ch = -1;
1359                 dma_chan[channels[i]].prev_linked_ch = -1;
1360                 dma_chan[channels[i]].chain_id = -1;
1361                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1362                 omap_free_dma(channels[i]);
1363         }
1364
1365         kfree(channels);
1366
1367         dma_linked_lch[chain_id].linked_dmach_q = NULL;
1368         dma_linked_lch[chain_id].chain_mode = -1;
1369         dma_linked_lch[chain_id].chain_state = -1;
1370
1371         return (0);
1372 }
1373 EXPORT_SYMBOL(omap_free_dma_chain);
1374
1375 /**
1376  * @brief omap_dma_chain_status - Check if the chain is in
1377  * active / inactive state.
1378  * @param chain_id
1379  *
1380  * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1381  *           Failure : -EINVAL
1382  */
1383 int omap_dma_chain_status(int chain_id)
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         pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1397                         dma_linked_lch[chain_id].q_count);
1398
1399         if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1400                 return OMAP_DMA_CHAIN_INACTIVE;
1401
1402         return OMAP_DMA_CHAIN_ACTIVE;
1403 }
1404 EXPORT_SYMBOL(omap_dma_chain_status);
1405
1406 /**
1407  * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1408  * set the params and start the transfer.
1409  *
1410  * @param chain_id
1411  * @param src_start - buffer start address
1412  * @param dest_start - Dest address
1413  * @param elem_count
1414  * @param frame_count
1415  * @param callbk_data - channel callback parameter data.
1416  *
1417  * @return  - Success : 0
1418  *            Failure: -EINVAL/-EBUSY
1419  */
1420 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1421                         int elem_count, int frame_count, void *callbk_data)
1422 {
1423         int *channels;
1424         u32 l, lch;
1425         int start_dma = 0;
1426
1427         /*
1428          * if buffer size is less than 1 then there is
1429          * no use of starting the chain
1430          */
1431         if (elem_count < 1) {
1432                 printk(KERN_ERR "Invalid buffer size\n");
1433                 return -EINVAL;
1434         }
1435
1436         /* Check for input params */
1437         if (unlikely((chain_id < 0
1438                         || chain_id >= dma_lch_count))) {
1439                 printk(KERN_ERR "Invalid chain id\n");
1440                 return -EINVAL;
1441         }
1442
1443         /* Check if the chain exists */
1444         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1445                 printk(KERN_ERR "Chain doesn't exist\n");
1446                 return -EINVAL;
1447         }
1448
1449         /* Check if all the channels in chain are in use */
1450         if (OMAP_DMA_CHAIN_QFULL(chain_id))
1451                 return -EBUSY;
1452
1453         /* Frame count may be negative in case of indexed transfers */
1454         channels = dma_linked_lch[chain_id].linked_dmach_q;
1455
1456         /* Get a free channel */
1457         lch = channels[dma_linked_lch[chain_id].q_tail];
1458
1459         /* Store the callback data */
1460         dma_chan[lch].data = callbk_data;
1461
1462         /* Increment the q_tail */
1463         OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1464
1465         /* Set the params to the free channel */
1466         if (src_start != 0)
1467                 p->dma_write(src_start, CSSA, lch);
1468         if (dest_start != 0)
1469                 p->dma_write(dest_start, CDSA, lch);
1470
1471         /* Write the buffer size */
1472         p->dma_write(elem_count, CEN, lch);
1473         p->dma_write(frame_count, CFN, lch);
1474
1475         /*
1476          * If the chain is dynamically linked,
1477          * then we may have to start the chain if its not active
1478          */
1479         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1480
1481                 /*
1482                  * In Dynamic chain, if the chain is not started,
1483                  * queue the channel
1484                  */
1485                 if (dma_linked_lch[chain_id].chain_state ==
1486                                                 DMA_CHAIN_NOTSTARTED) {
1487                         /* Enable the link in previous channel */
1488                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1489                                                                 DMA_CH_QUEUED)
1490                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1491                         dma_chan[lch].state = DMA_CH_QUEUED;
1492                 }
1493
1494                 /*
1495                  * Chain is already started, make sure its active,
1496                  * if not then start the chain
1497                  */
1498                 else {
1499                         start_dma = 1;
1500
1501                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1502                                                         DMA_CH_STARTED) {
1503                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1504                                 dma_chan[lch].state = DMA_CH_QUEUED;
1505                                 start_dma = 0;
1506                                 if (0 == ((1 << 7) & p->dma_read(
1507                                         CCR, dma_chan[lch].prev_linked_ch))) {
1508                                         disable_lnk(dma_chan[lch].
1509                                                     prev_linked_ch);
1510                                         pr_debug("\n prev ch is stopped\n");
1511                                         start_dma = 1;
1512                                 }
1513                         }
1514
1515                         else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1516                                                         == DMA_CH_QUEUED) {
1517                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1518                                 dma_chan[lch].state = DMA_CH_QUEUED;
1519                                 start_dma = 0;
1520                         }
1521                         omap_enable_channel_irq(lch);
1522
1523                         l = p->dma_read(CCR, lch);
1524
1525                         if ((0 == (l & (1 << 24))))
1526                                 l &= ~(1 << 25);
1527                         else
1528                                 l |= (1 << 25);
1529                         if (start_dma == 1) {
1530                                 if (0 == (l & (1 << 7))) {
1531                                         l |= (1 << 7);
1532                                         dma_chan[lch].state = DMA_CH_STARTED;
1533                                         pr_debug("starting %d\n", lch);
1534                                         p->dma_write(l, CCR, lch);
1535                                 } else
1536                                         start_dma = 0;
1537                         } else {
1538                                 if (0 == (l & (1 << 7)))
1539                                         p->dma_write(l, CCR, lch);
1540                         }
1541                         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1542                 }
1543         }
1544
1545         return 0;
1546 }
1547 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1548
1549 /**
1550  * @brief omap_start_dma_chain_transfers - Start the chain
1551  *
1552  * @param chain_id
1553  *
1554  * @return - Success : 0
1555  *           Failure : -EINVAL/-EBUSY
1556  */
1557 int omap_start_dma_chain_transfers(int chain_id)
1558 {
1559         int *channels;
1560         u32 l, i;
1561
1562         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1563                 printk(KERN_ERR "Invalid chain id\n");
1564                 return -EINVAL;
1565         }
1566
1567         channels = dma_linked_lch[chain_id].linked_dmach_q;
1568
1569         if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1570                 printk(KERN_ERR "Chain is already started\n");
1571                 return -EBUSY;
1572         }
1573
1574         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1575                 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1576                                                                         i++) {
1577                         enable_lnk(channels[i]);
1578                         omap_enable_channel_irq(channels[i]);
1579                 }
1580         } else {
1581                 omap_enable_channel_irq(channels[0]);
1582         }
1583
1584         l = p->dma_read(CCR, channels[0]);
1585         l |= (1 << 7);
1586         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1587         dma_chan[channels[0]].state = DMA_CH_STARTED;
1588
1589         if ((0 == (l & (1 << 24))))
1590                 l &= ~(1 << 25);
1591         else
1592                 l |= (1 << 25);
1593         p->dma_write(l, CCR, channels[0]);
1594
1595         dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1596
1597         return 0;
1598 }
1599 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1600
1601 /**
1602  * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1603  *
1604  * @param chain_id
1605  *
1606  * @return - Success : 0
1607  *           Failure : EINVAL
1608  */
1609 int omap_stop_dma_chain_transfers(int chain_id)
1610 {
1611         int *channels;
1612         u32 l, i;
1613         u32 sys_cf = 0;
1614
1615         /* Check for input params */
1616         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1617                 printk(KERN_ERR "Invalid chain id\n");
1618                 return -EINVAL;
1619         }
1620
1621         /* Check if the chain exists */
1622         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1623                 printk(KERN_ERR "Chain doesn't exists\n");
1624                 return -EINVAL;
1625         }
1626         channels = dma_linked_lch[chain_id].linked_dmach_q;
1627
1628         if (IS_DMA_ERRATA(DMA_ERRATA_i88)) {
1629                 sys_cf = p->dma_read(OCP_SYSCONFIG, 0);
1630                 l = sys_cf;
1631                 /* Middle mode reg set no Standby */
1632                 l &= ~((1 << 12)|(1 << 13));
1633                 p->dma_write(l, OCP_SYSCONFIG, 0);
1634         }
1635
1636         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1637
1638                 /* Stop the Channel transmission */
1639                 l = p->dma_read(CCR, channels[i]);
1640                 l &= ~(1 << 7);
1641                 p->dma_write(l, CCR, channels[i]);
1642
1643                 /* Disable the link in all the channels */
1644                 disable_lnk(channels[i]);
1645                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1646
1647         }
1648         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1649
1650         /* Reset the Queue pointers */
1651         OMAP_DMA_CHAIN_QINIT(chain_id);
1652
1653         if (IS_DMA_ERRATA(DMA_ERRATA_i88))
1654                 p->dma_write(sys_cf, OCP_SYSCONFIG, 0);
1655
1656         return 0;
1657 }
1658 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1659
1660 /* Get the index of the ongoing DMA in chain */
1661 /**
1662  * @brief omap_get_dma_chain_index - Get the element and frame index
1663  * of the ongoing DMA in chain
1664  *
1665  * @param chain_id
1666  * @param ei - Element index
1667  * @param fi - Frame index
1668  *
1669  * @return - Success : 0
1670  *           Failure : -EINVAL
1671  */
1672 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1673 {
1674         int lch;
1675         int *channels;
1676
1677         /* Check for input params */
1678         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1679                 printk(KERN_ERR "Invalid chain id\n");
1680                 return -EINVAL;
1681         }
1682
1683         /* Check if the chain exists */
1684         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1685                 printk(KERN_ERR "Chain doesn't exists\n");
1686                 return -EINVAL;
1687         }
1688         if ((!ei) || (!fi))
1689                 return -EINVAL;
1690
1691         channels = dma_linked_lch[chain_id].linked_dmach_q;
1692
1693         /* Get the current channel */
1694         lch = channels[dma_linked_lch[chain_id].q_head];
1695
1696         *ei = p->dma_read(CCEN, lch);
1697         *fi = p->dma_read(CCFN, lch);
1698
1699         return 0;
1700 }
1701 EXPORT_SYMBOL(omap_get_dma_chain_index);
1702
1703 /**
1704  * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1705  * ongoing DMA in chain
1706  *
1707  * @param chain_id
1708  *
1709  * @return - Success : Destination position
1710  *           Failure : -EINVAL
1711  */
1712 int omap_get_dma_chain_dst_pos(int chain_id)
1713 {
1714         int lch;
1715         int *channels;
1716
1717         /* Check for input params */
1718         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1719                 printk(KERN_ERR "Invalid chain id\n");
1720                 return -EINVAL;
1721         }
1722
1723         /* Check if the chain exists */
1724         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1725                 printk(KERN_ERR "Chain doesn't exists\n");
1726                 return -EINVAL;
1727         }
1728
1729         channels = dma_linked_lch[chain_id].linked_dmach_q;
1730
1731         /* Get the current channel */
1732         lch = channels[dma_linked_lch[chain_id].q_head];
1733
1734         return p->dma_read(CDAC, lch);
1735 }
1736 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1737
1738 /**
1739  * @brief omap_get_dma_chain_src_pos - Get the source position
1740  * of the ongoing DMA in chain
1741  * @param chain_id
1742  *
1743  * @return - Success : Destination position
1744  *           Failure : -EINVAL
1745  */
1746 int omap_get_dma_chain_src_pos(int chain_id)
1747 {
1748         int lch;
1749         int *channels;
1750
1751         /* Check for input params */
1752         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1753                 printk(KERN_ERR "Invalid chain id\n");
1754                 return -EINVAL;
1755         }
1756
1757         /* Check if the chain exists */
1758         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1759                 printk(KERN_ERR "Chain doesn't exists\n");
1760                 return -EINVAL;
1761         }
1762
1763         channels = dma_linked_lch[chain_id].linked_dmach_q;
1764
1765         /* Get the current channel */
1766         lch = channels[dma_linked_lch[chain_id].q_head];
1767
1768         return p->dma_read(CSAC, lch);
1769 }
1770 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1771 #endif  /* ifndef CONFIG_ARCH_OMAP1 */
1772
1773 /*----------------------------------------------------------------------------*/
1774
1775 #ifdef CONFIG_ARCH_OMAP1
1776
1777 static int omap1_dma_handle_ch(int ch)
1778 {
1779         u32 csr;
1780
1781         if (enable_1510_mode && ch >= 6) {
1782                 csr = dma_chan[ch].saved_csr;
1783                 dma_chan[ch].saved_csr = 0;
1784         } else
1785                 csr = p->dma_read(CSR, ch);
1786         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1787                 dma_chan[ch + 6].saved_csr = csr >> 7;
1788                 csr &= 0x7f;
1789         }
1790         if ((csr & 0x3f) == 0)
1791                 return 0;
1792         if (unlikely(dma_chan[ch].dev_id == -1)) {
1793                 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1794                        "%d (CSR %04x)\n", ch, csr);
1795                 return 0;
1796         }
1797         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1798                 printk(KERN_WARNING "DMA timeout with device %d\n",
1799                        dma_chan[ch].dev_id);
1800         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1801                 printk(KERN_WARNING "DMA synchronization event drop occurred "
1802                        "with device %d\n", dma_chan[ch].dev_id);
1803         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1804                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1805         if (likely(dma_chan[ch].callback != NULL))
1806                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1807
1808         return 1;
1809 }
1810
1811 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1812 {
1813         int ch = ((int) dev_id) - 1;
1814         int handled = 0;
1815
1816         for (;;) {
1817                 int handled_now = 0;
1818
1819                 handled_now += omap1_dma_handle_ch(ch);
1820                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1821                         handled_now += omap1_dma_handle_ch(ch + 6);
1822                 if (!handled_now)
1823                         break;
1824                 handled += handled_now;
1825         }
1826
1827         return handled ? IRQ_HANDLED : IRQ_NONE;
1828 }
1829
1830 #else
1831 #define omap1_dma_irq_handler   NULL
1832 #endif
1833
1834 #ifdef CONFIG_ARCH_OMAP2PLUS
1835
1836 static int omap2_dma_handle_ch(int ch)
1837 {
1838         u32 status = p->dma_read(CSR, ch);
1839
1840         if (!status) {
1841                 if (printk_ratelimit())
1842                         printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1843                                 ch);
1844                 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1845                 return 0;
1846         }
1847         if (unlikely(dma_chan[ch].dev_id == -1)) {
1848                 if (printk_ratelimit())
1849                         printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1850                                         "channel %d\n", status, ch);
1851                 return 0;
1852         }
1853         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1854                 printk(KERN_INFO
1855                        "DMA synchronization event drop occurred with device "
1856                        "%d\n", dma_chan[ch].dev_id);
1857         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1858                 printk(KERN_INFO "DMA transaction error with device %d\n",
1859                        dma_chan[ch].dev_id);
1860                 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1861                         u32 ccr;
1862
1863                         ccr = p->dma_read(CCR, ch);
1864                         ccr &= ~OMAP_DMA_CCR_EN;
1865                         p->dma_write(ccr, CCR, ch);
1866                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1867                 }
1868         }
1869         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1870                 printk(KERN_INFO "DMA secure error with device %d\n",
1871                        dma_chan[ch].dev_id);
1872         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1873                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1874                        dma_chan[ch].dev_id);
1875
1876         p->dma_write(status, CSR, ch);
1877         p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1878         /* read back the register to flush the write */
1879         p->dma_read(IRQSTATUS_L0, ch);
1880
1881         /* If the ch is not chained then chain_id will be -1 */
1882         if (dma_chan[ch].chain_id != -1) {
1883                 int chain_id = dma_chan[ch].chain_id;
1884                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1885                 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1886                         dma_chan[dma_chan[ch].next_linked_ch].state =
1887                                                         DMA_CH_STARTED;
1888                 if (dma_linked_lch[chain_id].chain_mode ==
1889                                                 OMAP_DMA_DYNAMIC_CHAIN)
1890                         disable_lnk(ch);
1891
1892                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1893                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1894
1895                 status = p->dma_read(CSR, ch);
1896                 p->dma_write(status, CSR, ch);
1897         }
1898
1899         if (likely(dma_chan[ch].callback != NULL))
1900                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1901
1902         return 0;
1903 }
1904
1905 /* STATUS register count is from 1-32 while our is 0-31 */
1906 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1907 {
1908         u32 val, enable_reg;
1909         int i;
1910
1911         val = p->dma_read(IRQSTATUS_L0, 0);
1912         if (val == 0) {
1913                 if (printk_ratelimit())
1914                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1915                 return IRQ_HANDLED;
1916         }
1917         enable_reg = p->dma_read(IRQENABLE_L0, 0);
1918         val &= enable_reg; /* Dispatch only relevant interrupts */
1919         for (i = 0; i < dma_lch_count && val != 0; i++) {
1920                 if (val & 1)
1921                         omap2_dma_handle_ch(i);
1922                 val >>= 1;
1923         }
1924
1925         return IRQ_HANDLED;
1926 }
1927
1928 static struct irqaction omap24xx_dma_irq = {
1929         .name = "DMA",
1930         .handler = omap2_dma_irq_handler,
1931         .flags = IRQF_DISABLED
1932 };
1933
1934 #else
1935 static struct irqaction omap24xx_dma_irq;
1936 #endif
1937
1938 /*----------------------------------------------------------------------------*/
1939
1940 void omap_dma_global_context_save(void)
1941 {
1942         omap_dma_global_context.dma_irqenable_l0 =
1943                 p->dma_read(IRQENABLE_L0, 0);
1944         omap_dma_global_context.dma_ocp_sysconfig =
1945                 p->dma_read(OCP_SYSCONFIG, 0);
1946         omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1947 }
1948
1949 void omap_dma_global_context_restore(void)
1950 {
1951         int ch;
1952
1953         p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1954         p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1955                 OCP_SYSCONFIG, 0);
1956         p->dma_write(omap_dma_global_context.dma_irqenable_l0,
1957                 IRQENABLE_L0, 0);
1958
1959         if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
1960                 p->dma_write(0x3 , IRQSTATUS_L0, 0);
1961
1962         for (ch = 0; ch < dma_chan_count; ch++)
1963                 if (dma_chan[ch].dev_id != -1)
1964                         omap_clear_dma(ch);
1965 }
1966
1967 static int __devinit omap_system_dma_probe(struct platform_device *pdev)
1968 {
1969         int ch, ret = 0;
1970         int dma_irq;
1971         char irq_name[4];
1972         int irq_rel;
1973
1974         p = pdev->dev.platform_data;
1975         if (!p) {
1976                 dev_err(&pdev->dev, "%s: System DMA initialized without"
1977                         "platform data\n", __func__);
1978                 return -EINVAL;
1979         }
1980
1981         d                       = p->dma_attr;
1982         errata                  = p->errata;
1983
1984         if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
1985                         && (omap_dma_reserve_channels <= dma_lch_count))
1986                 d->lch_count    = omap_dma_reserve_channels;
1987
1988         dma_lch_count           = d->lch_count;
1989         dma_chan_count          = dma_lch_count;
1990         dma_chan                = d->chan;
1991         enable_1510_mode        = d->dev_caps & ENABLE_1510_MODE;
1992
1993         if (cpu_class_is_omap2()) {
1994                 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
1995                                                 dma_lch_count, GFP_KERNEL);
1996                 if (!dma_linked_lch) {
1997                         ret = -ENOMEM;
1998                         goto exit_dma_lch_fail;
1999                 }
2000         }
2001
2002         spin_lock_init(&dma_chan_lock);
2003         for (ch = 0; ch < dma_chan_count; ch++) {
2004                 omap_clear_dma(ch);
2005                 if (cpu_class_is_omap2())
2006                         omap2_disable_irq_lch(ch);
2007
2008                 dma_chan[ch].dev_id = -1;
2009                 dma_chan[ch].next_lch = -1;
2010
2011                 if (ch >= 6 && enable_1510_mode)
2012                         continue;
2013
2014                 if (cpu_class_is_omap1()) {
2015                         /*
2016                          * request_irq() doesn't like dev_id (ie. ch) being
2017                          * zero, so we have to kludge around this.
2018                          */
2019                         sprintf(&irq_name[0], "%d", ch);
2020                         dma_irq = platform_get_irq_byname(pdev, irq_name);
2021
2022                         if (dma_irq < 0) {
2023                                 ret = dma_irq;
2024                                 goto exit_dma_irq_fail;
2025                         }
2026
2027                         /* INT_DMA_LCD is handled in lcd_dma.c */
2028                         if (dma_irq == INT_DMA_LCD)
2029                                 continue;
2030
2031                         ret = request_irq(dma_irq,
2032                                         omap1_dma_irq_handler, 0, "DMA",
2033                                         (void *) (ch + 1));
2034                         if (ret != 0)
2035                                 goto exit_dma_irq_fail;
2036                 }
2037         }
2038
2039         if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
2040                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2041                                 DMA_DEFAULT_FIFO_DEPTH, 0);
2042
2043         if (cpu_class_is_omap2()) {
2044                 strcpy(irq_name, "0");
2045                 dma_irq = platform_get_irq_byname(pdev, irq_name);
2046                 if (dma_irq < 0) {
2047                         dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
2048                         goto exit_dma_lch_fail;
2049                 }
2050                 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
2051                 if (ret) {
2052                         dev_err(&pdev->dev, "set_up failed for IRQ %d"
2053                                 "for DMA (error %d)\n", dma_irq, ret);
2054                         goto exit_dma_lch_fail;
2055                 }
2056         }
2057
2058         /* reserve dma channels 0 and 1 in high security devices */
2059         if (cpu_is_omap34xx() &&
2060                 (omap_type() != OMAP2_DEVICE_TYPE_GP)) {
2061                 printk(KERN_INFO "Reserving DMA channels 0 and 1 for "
2062                                 "HS ROM code\n");
2063                 dma_chan[0].dev_id = 0;
2064                 dma_chan[1].dev_id = 1;
2065         }
2066         p->show_dma_caps();
2067         return 0;
2068
2069 exit_dma_irq_fail:
2070         dev_err(&pdev->dev, "unable to request IRQ %d"
2071                         "for DMA (error %d)\n", dma_irq, ret);
2072         for (irq_rel = 0; irq_rel < ch; irq_rel++) {
2073                 dma_irq = platform_get_irq(pdev, irq_rel);
2074                 free_irq(dma_irq, (void *)(irq_rel + 1));
2075         }
2076
2077 exit_dma_lch_fail:
2078         kfree(p);
2079         kfree(d);
2080         kfree(dma_chan);
2081         return ret;
2082 }
2083
2084 static int __devexit omap_system_dma_remove(struct platform_device *pdev)
2085 {
2086         int dma_irq;
2087
2088         if (cpu_class_is_omap2()) {
2089                 char irq_name[4];
2090                 strcpy(irq_name, "0");
2091                 dma_irq = platform_get_irq_byname(pdev, irq_name);
2092                 remove_irq(dma_irq, &omap24xx_dma_irq);
2093         } else {
2094                 int irq_rel = 0;
2095                 for ( ; irq_rel < dma_chan_count; irq_rel++) {
2096                         dma_irq = platform_get_irq(pdev, irq_rel);
2097                         free_irq(dma_irq, (void *)(irq_rel + 1));
2098                 }
2099         }
2100         kfree(p);
2101         kfree(d);
2102         kfree(dma_chan);
2103         return 0;
2104 }
2105
2106 static struct platform_driver omap_system_dma_driver = {
2107         .probe          = omap_system_dma_probe,
2108         .remove         = omap_system_dma_remove,
2109         .driver         = {
2110                 .name   = "omap_dma_system"
2111         },
2112 };
2113
2114 static int __init omap_system_dma_init(void)
2115 {
2116         return platform_driver_register(&omap_system_dma_driver);
2117 }
2118 arch_initcall(omap_system_dma_init);
2119
2120 static void __exit omap_system_dma_exit(void)
2121 {
2122         platform_driver_unregister(&omap_system_dma_driver);
2123 }
2124
2125 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
2126 MODULE_LICENSE("GPL");
2127 MODULE_ALIAS("platform:" DRIVER_NAME);
2128 MODULE_AUTHOR("Texas Instruments Inc");
2129
2130 /*
2131  * Reserve the omap SDMA channels using cmdline bootarg
2132  * "omap_dma_reserve_ch=". The valid range is 1 to 32
2133  */
2134 static int __init omap_dma_cmdline_reserve_ch(char *str)
2135 {
2136         if (get_option(&str, &omap_dma_reserve_channels) != 1)
2137                 omap_dma_reserve_channels = 0;
2138         return 1;
2139 }
2140
2141 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2142
2143