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  * This program is free software; you can redistribute it and/or modify
  19  * it under the terms of the GNU General Public License version 2 as
  20  * published by the Free Software Foundation.
  21  *
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/sched.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/errno.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/irq.h>
  31 #include <linux/io.h>
  32 #include <linux/slab.h>
  33
  34 #include <asm/system.h>
  35 #include <mach/hardware.h>
  36 #include <plat/dma.h>
  37
  38 #include <plat/tc.h>
  39
  40 #undef DEBUG
  41
  42 #ifndef CONFIG_ARCH_OMAP1
  43 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
  44         DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
  45 };
  46
  47 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
  48 #endif
  49
  50 #define OMAP_DMA_ACTIVE                 0x01
  51 #define OMAP2_DMA_CSR_CLEAR_MASK        0xffe
  52
  53 #define OMAP_FUNC_MUX_ARM_BASE          (0xfffe1000 + 0xec)
  54
  55 static int enable_1510_mode;
  56
  57 static struct omap_dma_global_context_registers {
  58         u32 dma_irqenable_l0;
  59         u32 dma_ocp_sysconfig;
  60         u32 dma_gcr;
  61 } omap_dma_global_context;
  62
  63 struct omap_dma_lch {
  64         int next_lch;
  65         int dev_id;
  66         u16 saved_csr;
  67         u16 enabled_irqs;
  68         const char *dev_name;
  69         void (*callback)(int lch, u16 ch_status, void *data);
  70         void *data;
  71
  72 #ifndef CONFIG_ARCH_OMAP1
  73         /* required for Dynamic chaining */
  74         int prev_linked_ch;
  75         int next_linked_ch;
  76         int state;
  77         int chain_id;
  78
  79         int status;
  80 #endif
  81         long flags;
  82 };
  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 static void __iomem *omap_dma_base;
 140
 141 static const u8 omap1_dma_irq[OMAP1_LOGICAL_DMA_CH_COUNT] = {
 142         INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
 143         INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
 144         INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
 145         INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
 146         INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
 147 };
 148
 149 static inline void disable_lnk(int lch);
 150 static void omap_disable_channel_irq(int lch);
 151 static inline void omap_enable_channel_irq(int lch);
 152
 153 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 154                                                 __func__);
 155
 156 #define dma_read(reg)                                                   \
 157 ({                                                                      \
 158         u32 __val;                                                      \
 159         if (cpu_class_is_omap1())                                       \
 160                 __val = __raw_readw(omap_dma_base + OMAP1_DMA_##reg);   \
 161         else                                                            \
 162                 __val = __raw_readl(omap_dma_base + OMAP_DMA4_##reg);   \
 163         __val;                                                          \
 164 })
 165
 166 #define dma_write(val, reg)                                             \
 167 ({                                                                      \
 168         if (cpu_class_is_omap1())                                       \
 169                 __raw_writew((u16)(val), omap_dma_base + OMAP1_DMA_##reg); \
 170         else                                                            \
 171                 __raw_writel((val), omap_dma_base + OMAP_DMA4_##reg);   \
 172 })
 173
 174 #ifdef CONFIG_ARCH_OMAP15XX
 175 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 176 int omap_dma_in_1510_mode(void)
 177 {
 178         return enable_1510_mode;
 179 }
 180 #else
 181 #define omap_dma_in_1510_mode()         0
 182 #endif
 183
 184 #ifdef CONFIG_ARCH_OMAP1
 185 static inline int get_gdma_dev(int req)
 186 {
 187         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 188         int shift = ((req - 1) % 5) * 6;
 189
 190         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
 191 }
 192
 193 static inline void set_gdma_dev(int req, int dev)
 194 {
 195         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 196         int shift = ((req - 1) % 5) * 6;
 197         u32 l;
 198
 199         l = omap_readl(reg);
 200         l &= ~(0x3f << shift);
 201         l |= (dev - 1) << shift;
 202         omap_writel(l, reg);
 203 }
 204 #else
 205 #define set_gdma_dev(req, dev)  do {} while (0)
 206 #endif
 207
 208 /* Omap1 only */
 209 static void clear_lch_regs(int lch)
 210 {
 211         int i;
 212         void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch);
 213
 214         for (i = 0; i < 0x2c; i += 2)
 215                 __raw_writew(0, lch_base + i);
 216 }
 217
 218 void omap_set_dma_priority(int lch, int dst_port, int priority)
 219 {
 220         unsigned long reg;
 221         u32 l;
 222
 223         if (cpu_class_is_omap1()) {
 224                 switch (dst_port) {
 225                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 226                         reg = OMAP_TC_OCPT1_PRIOR;
 227                         break;
 228                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 229                         reg = OMAP_TC_OCPT2_PRIOR;
 230                         break;
 231                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 232                         reg = OMAP_TC_EMIFF_PRIOR;
 233                         break;
 234                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 235                         reg = OMAP_TC_EMIFS_PRIOR;
 236                         break;
 237                 default:
 238                         BUG();
 239                         return;
 240                 }
 241                 l = omap_readl(reg);
 242                 l &= ~(0xf << 8);
 243                 l |= (priority & 0xf) << 8;
 244                 omap_writel(l, reg);
 245         }
 246
 247         if (cpu_class_is_omap2()) {
 248                 u32 ccr;
 249
 250                 ccr = dma_read(CCR(lch));
 251                 if (priority)
 252                         ccr |= (1 << 6);
 253                 else
 254                         ccr &= ~(1 << 6);
 255                 dma_write(ccr, CCR(lch));
 256         }
 257 }
 258 EXPORT_SYMBOL(omap_set_dma_priority);
 259
 260 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 261                                   int frame_count, int sync_mode,
 262                                   int dma_trigger, int src_or_dst_synch)
 263 {
 264         u32 l;
 265
 266         l = dma_read(CSDP(lch));
 267         l &= ~0x03;
 268         l |= data_type;
 269         dma_write(l, CSDP(lch));
 270
 271         if (cpu_class_is_omap1()) {
 272                 u16 ccr;
 273
 274                 ccr = dma_read(CCR(lch));
 275                 ccr &= ~(1 << 5);
 276                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 277                         ccr |= 1 << 5;
 278                 dma_write(ccr, CCR(lch));
 279
 280                 ccr = dma_read(CCR2(lch));
 281                 ccr &= ~(1 << 2);
 282                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 283                         ccr |= 1 << 2;
 284                 dma_write(ccr, CCR2(lch));
 285         }
 286
 287         if (cpu_class_is_omap2() && dma_trigger) {
 288                 u32 val;
 289
 290                 val = dma_read(CCR(lch));
 291
 292                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 293                 val &= ~((3 << 19) | 0x1f);
 294                 val |= (dma_trigger & ~0x1f) << 14;
 295                 val |= dma_trigger & 0x1f;
 296
 297                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 298                         val |= 1 << 5;
 299                 else
 300                         val &= ~(1 << 5);
 301
 302                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 303                         val |= 1 << 18;
 304                 else
 305                         val &= ~(1 << 18);
 306
 307                 if (src_or_dst_synch)
 308                         val |= 1 << 24;         /* source synch */
 309                 else
 310                         val &= ~(1 << 24);      /* dest synch */
 311
 312                 dma_write(val, CCR(lch));
 313         }
 314
 315         dma_write(elem_count, CEN(lch));
 316         dma_write(frame_count, CFN(lch));
 317 }
 318 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 319
 320 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 321 {
 322         BUG_ON(omap_dma_in_1510_mode());
 323
 324         if (cpu_class_is_omap1()) {
 325                 u16 w;
 326
 327                 w = dma_read(CCR2(lch));
 328                 w &= ~0x03;
 329
 330                 switch (mode) {
 331                 case OMAP_DMA_CONSTANT_FILL:
 332                         w |= 0x01;
 333                         break;
 334                 case OMAP_DMA_TRANSPARENT_COPY:
 335                         w |= 0x02;
 336                         break;
 337                 case OMAP_DMA_COLOR_DIS:
 338                         break;
 339                 default:
 340                         BUG();
 341                 }
 342                 dma_write(w, CCR2(lch));
 343
 344                 w = dma_read(LCH_CTRL(lch));
 345                 w &= ~0x0f;
 346                 /* Default is channel type 2D */
 347                 if (mode) {
 348                         dma_write((u16)color, COLOR_L(lch));
 349                         dma_write((u16)(color >> 16), COLOR_U(lch));
 350                         w |= 1;         /* Channel type G */
 351                 }
 352                 dma_write(w, LCH_CTRL(lch));
 353         }
 354
 355         if (cpu_class_is_omap2()) {
 356                 u32 val;
 357
 358                 val = dma_read(CCR(lch));
 359                 val &= ~((1 << 17) | (1 << 16));
 360
 361                 switch (mode) {
 362                 case OMAP_DMA_CONSTANT_FILL:
 363                         val |= 1 << 16;
 364                         break;
 365                 case OMAP_DMA_TRANSPARENT_COPY:
 366                         val |= 1 << 17;
 367                         break;
 368                 case OMAP_DMA_COLOR_DIS:
 369                         break;
 370                 default:
 371                         BUG();
 372                 }
 373                 dma_write(val, CCR(lch));
 374
 375                 color &= 0xffffff;
 376                 dma_write(color, COLOR(lch));
 377         }
 378 }
 379 EXPORT_SYMBOL(omap_set_dma_color_mode);
 380
 381 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 382 {
 383         if (cpu_class_is_omap2()) {
 384                 u32 csdp;
 385
 386                 csdp = dma_read(CSDP(lch));
 387                 csdp &= ~(0x3 << 16);
 388                 csdp |= (mode << 16);
 389                 dma_write(csdp, CSDP(lch));
 390         }
 391 }
 392 EXPORT_SYMBOL(omap_set_dma_write_mode);
 393
 394 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 395 {
 396         if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
 397                 u32 l;
 398
 399                 l = dma_read(LCH_CTRL(lch));
 400                 l &= ~0x7;
 401                 l |= mode;
 402                 dma_write(l, LCH_CTRL(lch));
 403         }
 404 }
 405 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 406
 407 /* Note that src_port is only for omap1 */
 408 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 409                              unsigned long src_start,
 410                              int src_ei, int src_fi)
 411 {
 412         u32 l;
 413
 414         if (cpu_class_is_omap1()) {
 415                 u16 w;
 416
 417                 w = dma_read(CSDP(lch));
 418                 w &= ~(0x1f << 2);
 419                 w |= src_port << 2;
 420                 dma_write(w, CSDP(lch));
 421         }
 422
 423         l = dma_read(CCR(lch));
 424         l &= ~(0x03 << 12);
 425         l |= src_amode << 12;
 426         dma_write(l, CCR(lch));
 427
 428         if (cpu_class_is_omap1()) {
 429                 dma_write(src_start >> 16, CSSA_U(lch));
 430                 dma_write((u16)src_start, CSSA_L(lch));
 431         }
 432
 433         if (cpu_class_is_omap2())
 434                 dma_write(src_start, CSSA(lch));
 435
 436         dma_write(src_ei, CSEI(lch));
 437         dma_write(src_fi, CSFI(lch));
 438 }
 439 EXPORT_SYMBOL(omap_set_dma_src_params);
 440
 441 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 442 {
 443         omap_set_dma_transfer_params(lch, params->data_type,
 444                                      params->elem_count, params->frame_count,
 445                                      params->sync_mode, params->trigger,
 446                                      params->src_or_dst_synch);
 447         omap_set_dma_src_params(lch, params->src_port,
 448                                 params->src_amode, params->src_start,
 449                                 params->src_ei, params->src_fi);
 450
 451         omap_set_dma_dest_params(lch, params->dst_port,
 452                                  params->dst_amode, params->dst_start,
 453                                  params->dst_ei, params->dst_fi);
 454         if (params->read_prio || params->write_prio)
 455                 omap_dma_set_prio_lch(lch, params->read_prio,
 456                                       params->write_prio);
 457 }
 458 EXPORT_SYMBOL(omap_set_dma_params);
 459
 460 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 461 {
 462         if (cpu_class_is_omap2())
 463                 return;
 464
 465         dma_write(eidx, CSEI(lch));
 466         dma_write(fidx, CSFI(lch));
 467 }
 468 EXPORT_SYMBOL(omap_set_dma_src_index);
 469
 470 void omap_set_dma_src_data_pack(int lch, int enable)
 471 {
 472         u32 l;
 473
 474         l = dma_read(CSDP(lch));
 475         l &= ~(1 << 6);
 476         if (enable)
 477                 l |= (1 << 6);
 478         dma_write(l, CSDP(lch));
 479 }
 480 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 481
 482 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 483 {
 484         unsigned int burst = 0;
 485         u32 l;
 486
 487         l = dma_read(CSDP(lch));
 488         l &= ~(0x03 << 7);
 489
 490         switch (burst_mode) {
 491         case OMAP_DMA_DATA_BURST_DIS:
 492                 break;
 493         case OMAP_DMA_DATA_BURST_4:
 494                 if (cpu_class_is_omap2())
 495                         burst = 0x1;
 496                 else
 497                         burst = 0x2;
 498                 break;
 499         case OMAP_DMA_DATA_BURST_8:
 500                 if (cpu_class_is_omap2()) {
 501                         burst = 0x2;
 502                         break;
 503                 }
 504                 /* not supported by current hardware on OMAP1
 505                  * w |= (0x03 << 7);
 506                  * fall through
 507                  */
 508         case OMAP_DMA_DATA_BURST_16:
 509                 if (cpu_class_is_omap2()) {
 510                         burst = 0x3;
 511                         break;
 512                 }
 513                 /* OMAP1 don't support burst 16
 514                  * fall through
 515                  */
 516         default:
 517                 BUG();
 518         }
 519
 520         l |= (burst << 7);
 521         dma_write(l, CSDP(lch));
 522 }
 523 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 524
 525 /* Note that dest_port is only for OMAP1 */
 526 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 527                               unsigned long dest_start,
 528                               int dst_ei, int dst_fi)
 529 {
 530         u32 l;
 531
 532         if (cpu_class_is_omap1()) {
 533                 l = dma_read(CSDP(lch));
 534                 l &= ~(0x1f << 9);
 535                 l |= dest_port << 9;
 536                 dma_write(l, CSDP(lch));
 537         }
 538
 539         l = dma_read(CCR(lch));
 540         l &= ~(0x03 << 14);
 541         l |= dest_amode << 14;
 542         dma_write(l, CCR(lch));
 543
 544         if (cpu_class_is_omap1()) {
 545                 dma_write(dest_start >> 16, CDSA_U(lch));
 546                 dma_write(dest_start, CDSA_L(lch));
 547         }
 548
 549         if (cpu_class_is_omap2())
 550                 dma_write(dest_start, CDSA(lch));
 551
 552         dma_write(dst_ei, CDEI(lch));
 553         dma_write(dst_fi, CDFI(lch));
 554 }
 555 EXPORT_SYMBOL(omap_set_dma_dest_params);
 556
 557 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 558 {
 559         if (cpu_class_is_omap2())
 560                 return;
 561
 562         dma_write(eidx, CDEI(lch));
 563         dma_write(fidx, CDFI(lch));
 564 }
 565 EXPORT_SYMBOL(omap_set_dma_dest_index);
 566
 567 void omap_set_dma_dest_data_pack(int lch, int enable)
 568 {
 569         u32 l;
 570
 571         l = dma_read(CSDP(lch));
 572         l &= ~(1 << 13);
 573         if (enable)
 574                 l |= 1 << 13;
 575         dma_write(l, CSDP(lch));
 576 }
 577 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 578
 579 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 580 {
 581         unsigned int burst = 0;
 582         u32 l;
 583
 584         l = dma_read(CSDP(lch));
 585         l &= ~(0x03 << 14);
 586
 587         switch (burst_mode) {
 588         case OMAP_DMA_DATA_BURST_DIS:
 589                 break;
 590         case OMAP_DMA_DATA_BURST_4:
 591                 if (cpu_class_is_omap2())
 592                         burst = 0x1;
 593                 else
 594                         burst = 0x2;
 595                 break;
 596         case OMAP_DMA_DATA_BURST_8:
 597                 if (cpu_class_is_omap2())
 598                         burst = 0x2;
 599                 else
 600                         burst = 0x3;
 601                 break;
 602         case OMAP_DMA_DATA_BURST_16:
 603                 if (cpu_class_is_omap2()) {
 604                         burst = 0x3;
 605                         break;
 606                 }
 607                 /* OMAP1 don't support burst 16
 608                  * fall through
 609                  */
 610         default:
 611                 printk(KERN_ERR "Invalid DMA burst mode\n");
 612                 BUG();
 613                 return;
 614         }
 615         l |= (burst << 14);
 616         dma_write(l, CSDP(lch));
 617 }
 618 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 619
 620 static inline void omap_enable_channel_irq(int lch)
 621 {
 622         u32 status;
 623
 624         /* Clear CSR */
 625         if (cpu_class_is_omap1())
 626                 status = dma_read(CSR(lch));
 627         else if (cpu_class_is_omap2())
 628                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
 629
 630         /* Enable some nice interrupts. */
 631         dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
 632 }
 633
 634 static void omap_disable_channel_irq(int lch)
 635 {
 636         if (cpu_class_is_omap2())
 637                 dma_write(0, CICR(lch));
 638 }
 639
 640 void omap_enable_dma_irq(int lch, u16 bits)
 641 {
 642         dma_chan[lch].enabled_irqs |= bits;
 643 }
 644 EXPORT_SYMBOL(omap_enable_dma_irq);
 645
 646 void omap_disable_dma_irq(int lch, u16 bits)
 647 {
 648         dma_chan[lch].enabled_irqs &= ~bits;
 649 }
 650 EXPORT_SYMBOL(omap_disable_dma_irq);
 651
 652 static inline void enable_lnk(int lch)
 653 {
 654         u32 l;
 655
 656         l = dma_read(CLNK_CTRL(lch));
 657
 658         if (cpu_class_is_omap1())
 659                 l &= ~(1 << 14);
 660
 661         /* Set the ENABLE_LNK bits */
 662         if (dma_chan[lch].next_lch != -1)
 663                 l = dma_chan[lch].next_lch | (1 << 15);
 664
 665 #ifndef CONFIG_ARCH_OMAP1
 666         if (cpu_class_is_omap2())
 667                 if (dma_chan[lch].next_linked_ch != -1)
 668                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 669 #endif
 670
 671         dma_write(l, CLNK_CTRL(lch));
 672 }
 673
 674 static inline void disable_lnk(int lch)
 675 {
 676         u32 l;
 677
 678         l = dma_read(CLNK_CTRL(lch));
 679
 680         /* Disable interrupts */
 681         if (cpu_class_is_omap1()) {
 682                 dma_write(0, CICR(lch));
 683                 /* Set the STOP_LNK bit */
 684                 l |= 1 << 14;
 685         }
 686
 687         if (cpu_class_is_omap2()) {
 688                 omap_disable_channel_irq(lch);
 689                 /* Clear the ENABLE_LNK bit */
 690                 l &= ~(1 << 15);
 691         }
 692
 693         dma_write(l, CLNK_CTRL(lch));
 694         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 695 }
 696
 697 static inline void omap2_enable_irq_lch(int lch)
 698 {
 699         u32 val;
 700         unsigned long flags;
 701
 702         if (!cpu_class_is_omap2())
 703                 return;
 704
 705         spin_lock_irqsave(&dma_chan_lock, flags);
 706         val = dma_read(IRQENABLE_L0);
 707         val |= 1 << lch;
 708         dma_write(val, IRQENABLE_L0);
 709         spin_unlock_irqrestore(&dma_chan_lock, flags);
 710 }
 711
 712 int omap_request_dma(int dev_id, const char *dev_name,
 713                      void (*callback)(int lch, u16 ch_status, void *data),
 714                      void *data, int *dma_ch_out)
 715 {
 716         int ch, free_ch = -1;
 717         unsigned long flags;
 718         struct omap_dma_lch *chan;
 719
 720         spin_lock_irqsave(&dma_chan_lock, flags);
 721         for (ch = 0; ch < dma_chan_count; ch++) {
 722                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 723                         free_ch = ch;
 724                         if (dev_id == 0)
 725                                 break;
 726                 }
 727         }
 728         if (free_ch == -1) {
 729                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 730                 return -EBUSY;
 731         }
 732         chan = dma_chan + free_ch;
 733         chan->dev_id = dev_id;
 734
 735         if (cpu_class_is_omap1())
 736                 clear_lch_regs(free_ch);
 737
 738         if (cpu_class_is_omap2())
 739                 omap_clear_dma(free_ch);
 740
 741         spin_unlock_irqrestore(&dma_chan_lock, flags);
 742
 743         chan->dev_name = dev_name;
 744         chan->callback = callback;
 745         chan->data = data;
 746         chan->flags = 0;
 747
 748 #ifndef CONFIG_ARCH_OMAP1
 749         if (cpu_class_is_omap2()) {
 750                 chan->chain_id = -1;
 751                 chan->next_linked_ch = -1;
 752         }
 753 #endif
 754
 755         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 756
 757         if (cpu_class_is_omap1())
 758                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 759         else if (cpu_class_is_omap2())
 760                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 761                         OMAP2_DMA_TRANS_ERR_IRQ;
 762
 763         if (cpu_is_omap16xx()) {
 764                 /* If the sync device is set, configure it dynamically. */
 765                 if (dev_id != 0) {
 766                         set_gdma_dev(free_ch + 1, dev_id);
 767                         dev_id = free_ch + 1;
 768                 }
 769                 /*
 770                  * Disable the 1510 compatibility mode and set the sync device
 771                  * id.
 772                  */
 773                 dma_write(dev_id | (1 << 10), CCR(free_ch));
 774         } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
 775                 dma_write(dev_id, CCR(free_ch));
 776         }
 777
 778         if (cpu_class_is_omap2()) {
 779                 omap2_enable_irq_lch(free_ch);
 780                 omap_enable_channel_irq(free_ch);
 781                 /* Clear the CSR register and IRQ status register */
 782                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
 783                 dma_write(1 << free_ch, IRQSTATUS_L0);
 784         }
 785
 786         *dma_ch_out = free_ch;
 787
 788         return 0;
 789 }
 790 EXPORT_SYMBOL(omap_request_dma);
 791
 792 void omap_free_dma(int lch)
 793 {
 794         unsigned long flags;
 795
 796         if (dma_chan[lch].dev_id == -1) {
 797                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 798                        lch);
 799                 return;
 800         }
 801
 802         if (cpu_class_is_omap1()) {
 803                 /* Disable all DMA interrupts for the channel. */
 804                 dma_write(0, CICR(lch));
 805                 /* Make sure the DMA transfer is stopped. */
 806                 dma_write(0, CCR(lch));
 807         }
 808
 809         if (cpu_class_is_omap2()) {
 810                 u32 val;
 811
 812                 spin_lock_irqsave(&dma_chan_lock, flags);
 813                 /* Disable interrupts */
 814                 val = dma_read(IRQENABLE_L0);
 815                 val &= ~(1 << lch);
 816                 dma_write(val, IRQENABLE_L0);
 817                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 818
 819                 /* Clear the CSR register and IRQ status register */
 820                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
 821                 dma_write(1 << lch, IRQSTATUS_L0);
 822
 823                 /* Disable all DMA interrupts for the channel. */
 824                 dma_write(0, CICR(lch));
 825
 826                 /* Make sure the DMA transfer is stopped. */
 827                 dma_write(0, CCR(lch));
 828                 omap_clear_dma(lch);
 829         }
 830
 831         spin_lock_irqsave(&dma_chan_lock, flags);
 832         dma_chan[lch].dev_id = -1;
 833         dma_chan[lch].next_lch = -1;
 834         dma_chan[lch].callback = NULL;
 835         spin_unlock_irqrestore(&dma_chan_lock, flags);
 836 }
 837 EXPORT_SYMBOL(omap_free_dma);
 838
 839 /**
 840  * @brief omap_dma_set_global_params : Set global priority settings for dma
 841  *
 842  * @param arb_rate
 843  * @param max_fifo_depth
 844  * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
 845  *                                                 DMA_THREAD_RESERVE_ONET
 846  *                                                 DMA_THREAD_RESERVE_TWOT
 847  *                                                 DMA_THREAD_RESERVE_THREET
 848  */
 849 void
 850 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 851 {
 852         u32 reg;
 853
 854         if (!cpu_class_is_omap2()) {
 855                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 856                 return;
 857         }
 858
 859         if (max_fifo_depth == 0)
 860                 max_fifo_depth = 1;
 861         if (arb_rate == 0)
 862                 arb_rate = 1;
 863
 864         reg = 0xff & max_fifo_depth;
 865         reg |= (0x3 & tparams) << 12;
 866         reg |= (arb_rate & 0xff) << 16;
 867
 868         dma_write(reg, GCR);
 869 }
 870 EXPORT_SYMBOL(omap_dma_set_global_params);
 871
 872 /**
 873  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 874  *
 875  * @param lch
 876  * @param read_prio - Read priority
 877  * @param write_prio - Write priority
 878  * Both of the above can be set with one of the following values :
 879  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 880  */
 881 int
 882 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 883                       unsigned char write_prio)
 884 {
 885         u32 l;
 886
 887         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 888                 printk(KERN_ERR "Invalid channel id\n");
 889                 return -EINVAL;
 890         }
 891         l = dma_read(CCR(lch));
 892         l &= ~((1 << 6) | (1 << 26));
 893         if (cpu_is_omap2430() || cpu_is_omap34xx() ||  cpu_is_omap44xx())
 894                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 895         else
 896                 l |= ((read_prio & 0x1) << 6);
 897
 898         dma_write(l, CCR(lch));
 899
 900         return 0;
 901 }
 902 EXPORT_SYMBOL(omap_dma_set_prio_lch);
 903
 904 /*
 905  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 906  * through omap_start_dma(). Any buffers in flight are discarded.
 907  */
 908 void omap_clear_dma(int lch)
 909 {
 910         unsigned long flags;
 911
 912         local_irq_save(flags);
 913
 914         if (cpu_class_is_omap1()) {
 915                 u32 l;
 916
 917                 l = dma_read(CCR(lch));
 918                 l &= ~OMAP_DMA_CCR_EN;
 919                 dma_write(l, CCR(lch));
 920
 921                 /* Clear pending interrupts */
 922                 l = dma_read(CSR(lch));
 923         }
 924
 925         if (cpu_class_is_omap2()) {
 926                 int i;
 927                 void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch);
 928                 for (i = 0; i < 0x44; i += 4)
 929                         __raw_writel(0, lch_base + i);
 930         }
 931
 932         local_irq_restore(flags);
 933 }
 934 EXPORT_SYMBOL(omap_clear_dma);
 935
 936 void omap_start_dma(int lch)
 937 {
 938         u32 l;
 939
 940         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 941                 int next_lch, cur_lch;
 942                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
 943
 944                 dma_chan_link_map[lch] = 1;
 945                 /* Set the link register of the first channel */
 946                 enable_lnk(lch);
 947
 948                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 949                 cur_lch = dma_chan[lch].next_lch;
 950                 do {
 951                         next_lch = dma_chan[cur_lch].next_lch;
 952
 953                         /* The loop case: we've been here already */
 954                         if (dma_chan_link_map[cur_lch])
 955                                 break;
 956                         /* Mark the current channel */
 957                         dma_chan_link_map[cur_lch] = 1;
 958
 959                         enable_lnk(cur_lch);
 960                         omap_enable_channel_irq(cur_lch);
 961
 962                         cur_lch = next_lch;
 963                 } while (next_lch != -1);
 964         } else if (cpu_is_omap242x() ||
 965                 (cpu_is_omap243x() &&  omap_type() <= OMAP2430_REV_ES1_0)) {
 966
 967                 /* Errata: Need to write lch even if not using chaining */
 968                 dma_write(lch, CLNK_CTRL(lch));
 969         }
 970
 971         omap_enable_channel_irq(lch);
 972
 973         l = dma_read(CCR(lch));
 974
 975         /*
 976          * Errata: On ES2.0 BUFFERING disable must be set.
 977          * This will always fail on ES1.0
 978          */
 979         if (cpu_is_omap24xx())
 980                 l |= OMAP_DMA_CCR_EN;
 981
 982         l |= OMAP_DMA_CCR_EN;
 983         dma_write(l, CCR(lch));
 984
 985         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 986 }
 987 EXPORT_SYMBOL(omap_start_dma);
 988
 989 void omap_stop_dma(int lch)
 990 {
 991         u32 l;
 992
 993         /* Disable all interrupts on the channel */
 994         if (cpu_class_is_omap1())
 995                 dma_write(0, CICR(lch));
 996
 997         l = dma_read(CCR(lch));
 998         l &= ~OMAP_DMA_CCR_EN;
 999         dma_write(l, CCR(lch));
1000
1001         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
1002                 int next_lch, cur_lch = lch;
1003                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
1004
1005                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
1006                 do {
1007                         /* The loop case: we've been here already */
1008                         if (dma_chan_link_map[cur_lch])
1009                                 break;
1010                         /* Mark the current channel */
1011                         dma_chan_link_map[cur_lch] = 1;
1012
1013                         disable_lnk(cur_lch);
1014
1015                         next_lch = dma_chan[cur_lch].next_lch;
1016                         cur_lch = next_lch;
1017                 } while (next_lch != -1);
1018         }
1019
1020         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
1021 }
1022 EXPORT_SYMBOL(omap_stop_dma);
1023
1024 /*
1025  * Allows changing the DMA callback function or data. This may be needed if
1026  * the driver shares a single DMA channel for multiple dma triggers.
1027  */
1028 int omap_set_dma_callback(int lch,
1029                           void (*callback)(int lch, u16 ch_status, void *data),
1030                           void *data)
1031 {
1032         unsigned long flags;
1033
1034         if (lch < 0)
1035                 return -ENODEV;
1036
1037         spin_lock_irqsave(&dma_chan_lock, flags);
1038         if (dma_chan[lch].dev_id == -1) {
1039                 printk(KERN_ERR "DMA callback for not set for free channel\n");
1040                 spin_unlock_irqrestore(&dma_chan_lock, flags);
1041                 return -EINVAL;
1042         }
1043         dma_chan[lch].callback = callback;
1044         dma_chan[lch].data = data;
1045         spin_unlock_irqrestore(&dma_chan_lock, flags);
1046
1047         return 0;
1048 }
1049 EXPORT_SYMBOL(omap_set_dma_callback);
1050
1051 /*
1052  * Returns current physical source address for the given DMA channel.
1053  * If the channel is running the caller must disable interrupts prior calling
1054  * this function and process the returned value before re-enabling interrupt to
1055  * prevent races with the interrupt handler. Note that in continuous mode there
1056  * is a chance for CSSA_L register overflow inbetween the two reads resulting
1057  * in incorrect return value.
1058  */
1059 dma_addr_t omap_get_dma_src_pos(int lch)
1060 {
1061         dma_addr_t offset = 0;
1062
1063         if (cpu_is_omap15xx())
1064                 offset = dma_read(CPC(lch));
1065         else
1066                 offset = dma_read(CSAC(lch));
1067
1068         /*
1069          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1070          * read before the DMA controller finished disabling the channel.
1071          */
1072         if (!cpu_is_omap15xx() && offset == 0)
1073                 offset = dma_read(CSAC(lch));
1074
1075         if (cpu_class_is_omap1())
1076                 offset |= (dma_read(CSSA_U(lch)) << 16);
1077
1078         return offset;
1079 }
1080 EXPORT_SYMBOL(omap_get_dma_src_pos);
1081
1082 /*
1083  * Returns current physical destination address for the given DMA channel.
1084  * If the channel is running the caller must disable interrupts prior calling
1085  * this function and process the returned value before re-enabling interrupt to
1086  * prevent races with the interrupt handler. Note that in continuous mode there
1087  * is a chance for CDSA_L register overflow inbetween the two reads resulting
1088  * in incorrect return value.
1089  */
1090 dma_addr_t omap_get_dma_dst_pos(int lch)
1091 {
1092         dma_addr_t offset = 0;
1093
1094         if (cpu_is_omap15xx())
1095                 offset = dma_read(CPC(lch));
1096         else
1097                 offset = dma_read(CDAC(lch));
1098
1099         /*
1100          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1101          * read before the DMA controller finished disabling the channel.
1102          */
1103         if (!cpu_is_omap15xx() && offset == 0)
1104                 offset = dma_read(CDAC(lch));
1105
1106         if (cpu_class_is_omap1())
1107                 offset |= (dma_read(CDSA_U(lch)) << 16);
1108
1109         return offset;
1110 }
1111 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1112
1113 int omap_get_dma_active_status(int lch)
1114 {
1115         return (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN) != 0;
1116 }
1117 EXPORT_SYMBOL(omap_get_dma_active_status);
1118
1119 int omap_dma_running(void)
1120 {
1121         int lch;
1122
1123         if (cpu_class_is_omap1())
1124                 if (omap_lcd_dma_running())
1125                         return 1;
1126
1127         for (lch = 0; lch < dma_chan_count; lch++)
1128                 if (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN)
1129                         return 1;
1130
1131         return 0;
1132 }
1133
1134 /*
1135  * lch_queue DMA will start right after lch_head one is finished.
1136  * For this DMA link to start, you still need to start (see omap_start_dma)
1137  * the first one. That will fire up the entire queue.
1138  */
1139 void omap_dma_link_lch(int lch_head, int lch_queue)
1140 {
1141         if (omap_dma_in_1510_mode()) {
1142                 if (lch_head == lch_queue) {
1143                         dma_write(dma_read(CCR(lch_head)) | (3 << 8),
1144                                                                 CCR(lch_head));
1145                         return;
1146                 }
1147                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1148                 BUG();
1149                 return;
1150         }
1151
1152         if ((dma_chan[lch_head].dev_id == -1) ||
1153             (dma_chan[lch_queue].dev_id == -1)) {
1154                 printk(KERN_ERR "omap_dma: trying to link "
1155                        "non requested channels\n");
1156                 dump_stack();
1157         }
1158
1159         dma_chan[lch_head].next_lch = lch_queue;
1160 }
1161 EXPORT_SYMBOL(omap_dma_link_lch);
1162
1163 /*
1164  * Once the DMA queue is stopped, we can destroy it.
1165  */
1166 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1167 {
1168         if (omap_dma_in_1510_mode()) {
1169                 if (lch_head == lch_queue) {
1170                         dma_write(dma_read(CCR(lch_head)) & ~(3 << 8),
1171                                                                 CCR(lch_head));
1172                         return;
1173                 }
1174                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1175                 BUG();
1176                 return;
1177         }
1178
1179         if (dma_chan[lch_head].next_lch != lch_queue ||
1180             dma_chan[lch_head].next_lch == -1) {
1181                 printk(KERN_ERR "omap_dma: trying to unlink "
1182                        "non linked channels\n");
1183                 dump_stack();
1184         }
1185
1186         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1187             (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1188                 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1189                        "before unlinking\n");
1190                 dump_stack();
1191         }
1192
1193         dma_chan[lch_head].next_lch = -1;
1194 }
1195 EXPORT_SYMBOL(omap_dma_unlink_lch);
1196
1197 /*----------------------------------------------------------------------------*/
1198
1199 #ifndef CONFIG_ARCH_OMAP1
1200 /* Create chain of DMA channesls */
1201 static void create_dma_lch_chain(int lch_head, int lch_queue)
1202 {
1203         u32 l;
1204
1205         /* Check if this is the first link in chain */
1206         if (dma_chan[lch_head].next_linked_ch == -1) {
1207                 dma_chan[lch_head].next_linked_ch = lch_queue;
1208                 dma_chan[lch_head].prev_linked_ch = lch_queue;
1209                 dma_chan[lch_queue].next_linked_ch = lch_head;
1210                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1211         }
1212
1213         /* a link exists, link the new channel in circular chain */
1214         else {
1215                 dma_chan[lch_queue].next_linked_ch =
1216                                         dma_chan[lch_head].next_linked_ch;
1217                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1218                 dma_chan[lch_head].next_linked_ch = lch_queue;
1219                 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1220                                         lch_queue;
1221         }
1222
1223         l = dma_read(CLNK_CTRL(lch_head));
1224         l &= ~(0x1f);
1225         l |= lch_queue;
1226         dma_write(l, CLNK_CTRL(lch_head));
1227
1228         l = dma_read(CLNK_CTRL(lch_queue));
1229         l &= ~(0x1f);
1230         l |= (dma_chan[lch_queue].next_linked_ch);
1231         dma_write(l, CLNK_CTRL(lch_queue));
1232 }
1233
1234 /**
1235  * @brief omap_request_dma_chain : Request a chain of DMA channels
1236  *
1237  * @param dev_id - Device id using the dma channel
1238  * @param dev_name - Device name
1239  * @param callback - Call back function
1240  * @chain_id -
1241  * @no_of_chans - Number of channels requested
1242  * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1243  *                                            OMAP_DMA_DYNAMIC_CHAIN
1244  * @params - Channel parameters
1245  *
1246  * @return - Success : 0
1247  *           Failure: -EINVAL/-ENOMEM
1248  */
1249 int omap_request_dma_chain(int dev_id, const char *dev_name,
1250                            void (*callback) (int lch, u16 ch_status,
1251                                              void *data),
1252                            int *chain_id, int no_of_chans, int chain_mode,
1253                            struct omap_dma_channel_params params)
1254 {
1255         int *channels;
1256         int i, err;
1257
1258         /* Is the chain mode valid ? */
1259         if (chain_mode != OMAP_DMA_STATIC_CHAIN
1260                         && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1261                 printk(KERN_ERR "Invalid chain mode requested\n");
1262                 return -EINVAL;
1263         }
1264
1265         if (unlikely((no_of_chans < 1
1266                         || no_of_chans > dma_lch_count))) {
1267                 printk(KERN_ERR "Invalid Number of channels requested\n");
1268                 return -EINVAL;
1269         }
1270
1271         /* Allocate a queue to maintain the status of the channels
1272          * in the chain */
1273         channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1274         if (channels == NULL) {
1275                 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1276                 return -ENOMEM;
1277         }
1278
1279         /* request and reserve DMA channels for the chain */
1280         for (i = 0; i < no_of_chans; i++) {
1281                 err = omap_request_dma(dev_id, dev_name,
1282                                         callback, NULL, &channels[i]);
1283                 if (err < 0) {
1284                         int j;
1285                         for (j = 0; j < i; j++)
1286                                 omap_free_dma(channels[j]);
1287                         kfree(channels);
1288                         printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1289                         return err;
1290                 }
1291                 dma_chan[channels[i]].prev_linked_ch = -1;
1292                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1293
1294                 /*
1295                  * Allowing client drivers to set common parameters now,
1296                  * so that later only relevant (src_start, dest_start
1297                  * and element count) can be set
1298                  */
1299                 omap_set_dma_params(channels[i], &params);
1300         }
1301
1302         *chain_id = channels[0];
1303         dma_linked_lch[*chain_id].linked_dmach_q = channels;
1304         dma_linked_lch[*chain_id].chain_mode = chain_mode;
1305         dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1306         dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1307
1308         for (i = 0; i < no_of_chans; i++)
1309                 dma_chan[channels[i]].chain_id = *chain_id;
1310
1311         /* Reset the Queue pointers */
1312         OMAP_DMA_CHAIN_QINIT(*chain_id);
1313
1314         /* Set up the chain */
1315         if (no_of_chans == 1)
1316                 create_dma_lch_chain(channels[0], channels[0]);
1317         else {
1318                 for (i = 0; i < (no_of_chans - 1); i++)
1319                         create_dma_lch_chain(channels[i], channels[i + 1]);
1320         }
1321
1322         return 0;
1323 }
1324 EXPORT_SYMBOL(omap_request_dma_chain);
1325
1326 /**
1327  * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1328  * params after setting it. Dont do this while dma is running!!
1329  *
1330  * @param chain_id - Chained logical channel id.
1331  * @param params
1332  *
1333  * @return - Success : 0
1334  *           Failure : -EINVAL
1335  */
1336 int omap_modify_dma_chain_params(int chain_id,
1337                                 struct omap_dma_channel_params params)
1338 {
1339         int *channels;
1340         u32 i;
1341
1342         /* Check for input params */
1343         if (unlikely((chain_id < 0
1344                         || chain_id >= dma_lch_count))) {
1345                 printk(KERN_ERR "Invalid chain id\n");
1346                 return -EINVAL;
1347         }
1348
1349         /* Check if the chain exists */
1350         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1351                 printk(KERN_ERR "Chain doesn't exists\n");
1352                 return -EINVAL;
1353         }
1354         channels = dma_linked_lch[chain_id].linked_dmach_q;
1355
1356         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1357                 /*
1358                  * Allowing client drivers to set common parameters now,
1359                  * so that later only relevant (src_start, dest_start
1360                  * and element count) can be set
1361                  */
1362                 omap_set_dma_params(channels[i], &params);
1363         }
1364
1365         return 0;
1366 }
1367 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1368
1369 /**
1370  * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1371  *
1372  * @param chain_id
1373  *
1374  * @return - Success : 0
1375  *           Failure : -EINVAL
1376  */
1377 int omap_free_dma_chain(int chain_id)
1378 {
1379         int *channels;
1380         u32 i;
1381
1382         /* Check for input params */
1383         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1384                 printk(KERN_ERR "Invalid chain id\n");
1385                 return -EINVAL;
1386         }
1387
1388         /* Check if the chain exists */
1389         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1390                 printk(KERN_ERR "Chain doesn't exists\n");
1391                 return -EINVAL;
1392         }
1393
1394         channels = dma_linked_lch[chain_id].linked_dmach_q;
1395         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1396                 dma_chan[channels[i]].next_linked_ch = -1;
1397                 dma_chan[channels[i]].prev_linked_ch = -1;
1398                 dma_chan[channels[i]].chain_id = -1;
1399                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1400                 omap_free_dma(channels[i]);
1401         }
1402
1403         kfree(channels);
1404
1405         dma_linked_lch[chain_id].linked_dmach_q = NULL;
1406         dma_linked_lch[chain_id].chain_mode = -1;
1407         dma_linked_lch[chain_id].chain_state = -1;
1408
1409         return (0);
1410 }
1411 EXPORT_SYMBOL(omap_free_dma_chain);
1412
1413 /**
1414  * @brief omap_dma_chain_status - Check if the chain is in
1415  * active / inactive state.
1416  * @param chain_id
1417  *
1418  * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1419  *           Failure : -EINVAL
1420  */
1421 int omap_dma_chain_status(int chain_id)
1422 {
1423         /* Check for input params */
1424         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1425                 printk(KERN_ERR "Invalid chain id\n");
1426                 return -EINVAL;
1427         }
1428
1429         /* Check if the chain exists */
1430         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1431                 printk(KERN_ERR "Chain doesn't exists\n");
1432                 return -EINVAL;
1433         }
1434         pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1435                         dma_linked_lch[chain_id].q_count);
1436
1437         if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1438                 return OMAP_DMA_CHAIN_INACTIVE;
1439
1440         return OMAP_DMA_CHAIN_ACTIVE;
1441 }
1442 EXPORT_SYMBOL(omap_dma_chain_status);
1443
1444 /**
1445  * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1446  * set the params and start the transfer.
1447  *
1448  * @param chain_id
1449  * @param src_start - buffer start address
1450  * @param dest_start - Dest address
1451  * @param elem_count
1452  * @param frame_count
1453  * @param callbk_data - channel callback parameter data.
1454  *
1455  * @return  - Success : 0
1456  *            Failure: -EINVAL/-EBUSY
1457  */
1458 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1459                         int elem_count, int frame_count, void *callbk_data)
1460 {
1461         int *channels;
1462         u32 l, lch;
1463         int start_dma = 0;
1464
1465         /*
1466          * if buffer size is less than 1 then there is
1467          * no use of starting the chain
1468          */
1469         if (elem_count < 1) {
1470                 printk(KERN_ERR "Invalid buffer size\n");
1471                 return -EINVAL;
1472         }
1473
1474         /* Check for input params */
1475         if (unlikely((chain_id < 0
1476                         || chain_id >= dma_lch_count))) {
1477                 printk(KERN_ERR "Invalid chain id\n");
1478                 return -EINVAL;
1479         }
1480
1481         /* Check if the chain exists */
1482         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1483                 printk(KERN_ERR "Chain doesn't exist\n");
1484                 return -EINVAL;
1485         }
1486
1487         /* Check if all the channels in chain are in use */
1488         if (OMAP_DMA_CHAIN_QFULL(chain_id))
1489                 return -EBUSY;
1490
1491         /* Frame count may be negative in case of indexed transfers */
1492         channels = dma_linked_lch[chain_id].linked_dmach_q;
1493
1494         /* Get a free channel */
1495         lch = channels[dma_linked_lch[chain_id].q_tail];
1496
1497         /* Store the callback data */
1498         dma_chan[lch].data = callbk_data;
1499
1500         /* Increment the q_tail */
1501         OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1502
1503         /* Set the params to the free channel */
1504         if (src_start != 0)
1505                 dma_write(src_start, CSSA(lch));
1506         if (dest_start != 0)
1507                 dma_write(dest_start, CDSA(lch));
1508
1509         /* Write the buffer size */
1510         dma_write(elem_count, CEN(lch));
1511         dma_write(frame_count, CFN(lch));
1512
1513         /*
1514          * If the chain is dynamically linked,
1515          * then we may have to start the chain if its not active
1516          */
1517         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1518
1519                 /*
1520                  * In Dynamic chain, if the chain is not started,
1521                  * queue the channel
1522                  */
1523                 if (dma_linked_lch[chain_id].chain_state ==
1524                                                 DMA_CHAIN_NOTSTARTED) {
1525                         /* Enable the link in previous channel */
1526                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1527                                                                 DMA_CH_QUEUED)
1528                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1529                         dma_chan[lch].state = DMA_CH_QUEUED;
1530                 }
1531
1532                 /*
1533                  * Chain is already started, make sure its active,
1534                  * if not then start the chain
1535                  */
1536                 else {
1537                         start_dma = 1;
1538
1539                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1540                                                         DMA_CH_STARTED) {
1541                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1542                                 dma_chan[lch].state = DMA_CH_QUEUED;
1543                                 start_dma = 0;
1544                                 if (0 == ((1 << 7) & dma_read(
1545                                         CCR(dma_chan[lch].prev_linked_ch)))) {
1546                                         disable_lnk(dma_chan[lch].
1547                                                     prev_linked_ch);
1548                                         pr_debug("\n prev ch is stopped\n");
1549                                         start_dma = 1;
1550                                 }
1551                         }
1552
1553                         else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1554                                                         == DMA_CH_QUEUED) {
1555                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1556                                 dma_chan[lch].state = DMA_CH_QUEUED;
1557                                 start_dma = 0;
1558                         }
1559                         omap_enable_channel_irq(lch);
1560
1561                         l = dma_read(CCR(lch));
1562
1563                         if ((0 == (l & (1 << 24))))
1564                                 l &= ~(1 << 25);
1565                         else
1566                                 l |= (1 << 25);
1567                         if (start_dma == 1) {
1568                                 if (0 == (l & (1 << 7))) {
1569                                         l |= (1 << 7);
1570                                         dma_chan[lch].state = DMA_CH_STARTED;
1571                                         pr_debug("starting %d\n", lch);
1572                                         dma_write(l, CCR(lch));
1573                                 } else
1574                                         start_dma = 0;
1575                         } else {
1576                                 if (0 == (l & (1 << 7)))
1577                                         dma_write(l, CCR(lch));
1578                         }
1579                         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1580                 }
1581         }
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1586
1587 /**
1588  * @brief omap_start_dma_chain_transfers - Start the chain
1589  *
1590  * @param chain_id
1591  *
1592  * @return - Success : 0
1593  *           Failure : -EINVAL/-EBUSY
1594  */
1595 int omap_start_dma_chain_transfers(int chain_id)
1596 {
1597         int *channels;
1598         u32 l, i;
1599
1600         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1601                 printk(KERN_ERR "Invalid chain id\n");
1602                 return -EINVAL;
1603         }
1604
1605         channels = dma_linked_lch[chain_id].linked_dmach_q;
1606
1607         if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1608                 printk(KERN_ERR "Chain is already started\n");
1609                 return -EBUSY;
1610         }
1611
1612         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1613                 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1614                                                                         i++) {
1615                         enable_lnk(channels[i]);
1616                         omap_enable_channel_irq(channels[i]);
1617                 }
1618         } else {
1619                 omap_enable_channel_irq(channels[0]);
1620         }
1621
1622         l = dma_read(CCR(channels[0]));
1623         l |= (1 << 7);
1624         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1625         dma_chan[channels[0]].state = DMA_CH_STARTED;
1626
1627         if ((0 == (l & (1 << 24))))
1628                 l &= ~(1 << 25);
1629         else
1630                 l |= (1 << 25);
1631         dma_write(l, CCR(channels[0]));
1632
1633         dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1634
1635         return 0;
1636 }
1637 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1638
1639 /**
1640  * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1641  *
1642  * @param chain_id
1643  *
1644  * @return - Success : 0
1645  *           Failure : EINVAL
1646  */
1647 int omap_stop_dma_chain_transfers(int chain_id)
1648 {
1649         int *channels;
1650         u32 l, i;
1651         u32 sys_cf;
1652
1653         /* Check for input params */
1654         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1655                 printk(KERN_ERR "Invalid chain id\n");
1656                 return -EINVAL;
1657         }
1658
1659         /* Check if the chain exists */
1660         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1661                 printk(KERN_ERR "Chain doesn't exists\n");
1662                 return -EINVAL;
1663         }
1664         channels = dma_linked_lch[chain_id].linked_dmach_q;
1665
1666         /*
1667          * DMA Errata:
1668          * Special programming model needed to disable DMA before end of block
1669          */
1670         sys_cf = dma_read(OCP_SYSCONFIG);
1671         l = sys_cf;
1672         /* Middle mode reg set no Standby */
1673         l &= ~((1 << 12)|(1 << 13));
1674         dma_write(l, OCP_SYSCONFIG);
1675
1676         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1677
1678                 /* Stop the Channel transmission */
1679                 l = dma_read(CCR(channels[i]));
1680                 l &= ~(1 << 7);
1681                 dma_write(l, CCR(channels[i]));
1682
1683                 /* Disable the link in all the channels */
1684                 disable_lnk(channels[i]);
1685                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1686
1687         }
1688         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1689
1690         /* Reset the Queue pointers */
1691         OMAP_DMA_CHAIN_QINIT(chain_id);
1692
1693         /* Errata - put in the old value */
1694         dma_write(sys_cf, OCP_SYSCONFIG);
1695
1696         return 0;
1697 }
1698 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1699
1700 /* Get the index of the ongoing DMA in chain */
1701 /**
1702  * @brief omap_get_dma_chain_index - Get the element and frame index
1703  * of the ongoing DMA in chain
1704  *
1705  * @param chain_id
1706  * @param ei - Element index
1707  * @param fi - Frame index
1708  *
1709  * @return - Success : 0
1710  *           Failure : -EINVAL
1711  */
1712 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
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         if ((!ei) || (!fi))
1729                 return -EINVAL;
1730
1731         channels = dma_linked_lch[chain_id].linked_dmach_q;
1732
1733         /* Get the current channel */
1734         lch = channels[dma_linked_lch[chain_id].q_head];
1735
1736         *ei = dma_read(CCEN(lch));
1737         *fi = dma_read(CCFN(lch));
1738
1739         return 0;
1740 }
1741 EXPORT_SYMBOL(omap_get_dma_chain_index);
1742
1743 /**
1744  * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1745  * ongoing DMA in chain
1746  *
1747  * @param chain_id
1748  *
1749  * @return - Success : Destination position
1750  *           Failure : -EINVAL
1751  */
1752 int omap_get_dma_chain_dst_pos(int chain_id)
1753 {
1754         int lch;
1755         int *channels;
1756
1757         /* Check for input params */
1758         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1759                 printk(KERN_ERR "Invalid chain id\n");
1760                 return -EINVAL;
1761         }
1762
1763         /* Check if the chain exists */
1764         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1765                 printk(KERN_ERR "Chain doesn't exists\n");
1766                 return -EINVAL;
1767         }
1768
1769         channels = dma_linked_lch[chain_id].linked_dmach_q;
1770
1771         /* Get the current channel */
1772         lch = channels[dma_linked_lch[chain_id].q_head];
1773
1774         return dma_read(CDAC(lch));
1775 }
1776 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1777
1778 /**
1779  * @brief omap_get_dma_chain_src_pos - Get the source position
1780  * of the ongoing DMA in chain
1781  * @param chain_id
1782  *
1783  * @return - Success : Destination position
1784  *           Failure : -EINVAL
1785  */
1786 int omap_get_dma_chain_src_pos(int chain_id)
1787 {
1788         int lch;
1789         int *channels;
1790
1791         /* Check for input params */
1792         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1793                 printk(KERN_ERR "Invalid chain id\n");
1794                 return -EINVAL;
1795         }
1796
1797         /* Check if the chain exists */
1798         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1799                 printk(KERN_ERR "Chain doesn't exists\n");
1800                 return -EINVAL;
1801         }
1802
1803         channels = dma_linked_lch[chain_id].linked_dmach_q;
1804
1805         /* Get the current channel */
1806         lch = channels[dma_linked_lch[chain_id].q_head];
1807
1808         return dma_read(CSAC(lch));
1809 }
1810 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1811 #endif  /* ifndef CONFIG_ARCH_OMAP1 */
1812
1813 /*----------------------------------------------------------------------------*/
1814
1815 #ifdef CONFIG_ARCH_OMAP1
1816
1817 static int omap1_dma_handle_ch(int ch)
1818 {
1819         u32 csr;
1820
1821         if (enable_1510_mode && ch >= 6) {
1822                 csr = dma_chan[ch].saved_csr;
1823                 dma_chan[ch].saved_csr = 0;
1824         } else
1825                 csr = dma_read(CSR(ch));
1826         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1827                 dma_chan[ch + 6].saved_csr = csr >> 7;
1828                 csr &= 0x7f;
1829         }
1830         if ((csr & 0x3f) == 0)
1831                 return 0;
1832         if (unlikely(dma_chan[ch].dev_id == -1)) {
1833                 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1834                        "%d (CSR %04x)\n", ch, csr);
1835                 return 0;
1836         }
1837         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1838                 printk(KERN_WARNING "DMA timeout with device %d\n",
1839                        dma_chan[ch].dev_id);
1840         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1841                 printk(KERN_WARNING "DMA synchronization event drop occurred "
1842                        "with device %d\n", dma_chan[ch].dev_id);
1843         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1844                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1845         if (likely(dma_chan[ch].callback != NULL))
1846                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1847
1848         return 1;
1849 }
1850
1851 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1852 {
1853         int ch = ((int) dev_id) - 1;
1854         int handled = 0;
1855
1856         for (;;) {
1857                 int handled_now = 0;
1858
1859                 handled_now += omap1_dma_handle_ch(ch);
1860                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1861                         handled_now += omap1_dma_handle_ch(ch + 6);
1862                 if (!handled_now)
1863                         break;
1864                 handled += handled_now;
1865         }
1866
1867         return handled ? IRQ_HANDLED : IRQ_NONE;
1868 }
1869
1870 #else
1871 #define omap1_dma_irq_handler   NULL
1872 #endif
1873
1874 #ifdef CONFIG_ARCH_OMAP2PLUS
1875
1876 static int omap2_dma_handle_ch(int ch)
1877 {
1878         u32 status = dma_read(CSR(ch));
1879
1880         if (!status) {
1881                 if (printk_ratelimit())
1882                         printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1883                                 ch);
1884                 dma_write(1 << ch, IRQSTATUS_L0);
1885                 return 0;
1886         }
1887         if (unlikely(dma_chan[ch].dev_id == -1)) {
1888                 if (printk_ratelimit())
1889                         printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1890                                         "channel %d\n", status, ch);
1891                 return 0;
1892         }
1893         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1894                 printk(KERN_INFO
1895                        "DMA synchronization event drop occurred with device "
1896                        "%d\n", dma_chan[ch].dev_id);
1897         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1898                 printk(KERN_INFO "DMA transaction error with device %d\n",
1899                        dma_chan[ch].dev_id);
1900                 if (cpu_class_is_omap2()) {
1901                         /* Errata: sDMA Channel is not disabled
1902                          * after a transaction error. So we explicitely
1903                          * disable the channel
1904                          */
1905                         u32 ccr;
1906
1907                         ccr = dma_read(CCR(ch));
1908                         ccr &= ~OMAP_DMA_CCR_EN;
1909                         dma_write(ccr, CCR(ch));
1910                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1911                 }
1912         }
1913         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1914                 printk(KERN_INFO "DMA secure error with device %d\n",
1915                        dma_chan[ch].dev_id);
1916         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1917                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1918                        dma_chan[ch].dev_id);
1919
1920         dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
1921         dma_write(1 << ch, IRQSTATUS_L0);
1922
1923         /* If the ch is not chained then chain_id will be -1 */
1924         if (dma_chan[ch].chain_id != -1) {
1925                 int chain_id = dma_chan[ch].chain_id;
1926                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1927                 if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
1928                         dma_chan[dma_chan[ch].next_linked_ch].state =
1929                                                         DMA_CH_STARTED;
1930                 if (dma_linked_lch[chain_id].chain_mode ==
1931                                                 OMAP_DMA_DYNAMIC_CHAIN)
1932                         disable_lnk(ch);
1933
1934                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1935                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1936
1937                 status = dma_read(CSR(ch));
1938         }
1939
1940         dma_write(status, CSR(ch));
1941
1942         if (likely(dma_chan[ch].callback != NULL))
1943                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1944
1945         return 0;
1946 }
1947
1948 /* STATUS register count is from 1-32 while our is 0-31 */
1949 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1950 {
1951         u32 val, enable_reg;
1952         int i;
1953
1954         val = dma_read(IRQSTATUS_L0);
1955         if (val == 0) {
1956                 if (printk_ratelimit())
1957                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1958                 return IRQ_HANDLED;
1959         }
1960         enable_reg = dma_read(IRQENABLE_L0);
1961         val &= enable_reg; /* Dispatch only relevant interrupts */
1962         for (i = 0; i < dma_lch_count && val != 0; i++) {
1963                 if (val & 1)
1964                         omap2_dma_handle_ch(i);
1965                 val >>= 1;
1966         }
1967
1968         return IRQ_HANDLED;
1969 }
1970
1971 static struct irqaction omap24xx_dma_irq = {
1972         .name = "DMA",
1973         .handler = omap2_dma_irq_handler,
1974         .flags = IRQF_DISABLED
1975 };
1976
1977 #else
1978 static struct irqaction omap24xx_dma_irq;
1979 #endif
1980
1981 /*----------------------------------------------------------------------------*/
1982
1983 void omap_dma_global_context_save(void)
1984 {
1985         omap_dma_global_context.dma_irqenable_l0 =
1986                 dma_read(IRQENABLE_L0);
1987         omap_dma_global_context.dma_ocp_sysconfig =
1988                 dma_read(OCP_SYSCONFIG);
1989         omap_dma_global_context.dma_gcr = dma_read(GCR);
1990 }
1991
1992 void omap_dma_global_context_restore(void)
1993 {
1994         int ch;
1995
1996         dma_write(omap_dma_global_context.dma_gcr, GCR);
1997         dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1998                 OCP_SYSCONFIG);
1999         dma_write(omap_dma_global_context.dma_irqenable_l0,
2000                 IRQENABLE_L0);
2001
2002         /*
2003          * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
2004          * after secure sram context save and restore. Hence we need to
2005          * manually clear those IRQs to avoid spurious interrupts. This
2006          * affects only secure devices.
2007          */
2008         if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
2009                 dma_write(0x3 , IRQSTATUS_L0);
2010
2011         for (ch = 0; ch < dma_chan_count; ch++)
2012                 if (dma_chan[ch].dev_id != -1)
2013                         omap_clear_dma(ch);
2014 }
2015
2016 /*----------------------------------------------------------------------------*/
2017
2018 static int __init omap_init_dma(void)
2019 {
2020         unsigned long base;
2021         int ch, r;
2022
2023         if (cpu_class_is_omap1()) {
2024                 base = OMAP1_DMA_BASE;
2025                 dma_lch_count = OMAP1_LOGICAL_DMA_CH_COUNT;
2026         } else if (cpu_is_omap24xx()) {
2027                 base = OMAP24XX_DMA4_BASE;
2028                 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2029         } else if (cpu_is_omap34xx()) {
2030                 base = OMAP34XX_DMA4_BASE;
2031                 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2032         } else if (cpu_is_omap44xx()) {
2033                 base = OMAP44XX_DMA4_BASE;
2034                 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2035         } else {
2036                 pr_err("DMA init failed for unsupported omap\n");
2037                 return -ENODEV;
2038         }
2039
2040         omap_dma_base = ioremap(base, SZ_4K);
2041         BUG_ON(!omap_dma_base);
2042
2043         if (cpu_class_is_omap2() && omap_dma_reserve_channels
2044                         && (omap_dma_reserve_channels <= dma_lch_count))
2045                 dma_lch_count = omap_dma_reserve_channels;
2046
2047         dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
2048                                 GFP_KERNEL);
2049         if (!dma_chan) {
2050                 r = -ENOMEM;
2051                 goto out_unmap;
2052         }
2053
2054         if (cpu_class_is_omap2()) {
2055                 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2056                                                 dma_lch_count, GFP_KERNEL);
2057                 if (!dma_linked_lch) {
2058                         r = -ENOMEM;
2059                         goto out_free;
2060                 }
2061         }
2062
2063         if (cpu_is_omap15xx()) {
2064                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
2065                 dma_chan_count = 9;
2066                 enable_1510_mode = 1;
2067         } else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
2068                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
2069                        dma_read(HW_ID));
2070                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
2071                        (dma_read(CAPS_0_U) << 16) |
2072                        dma_read(CAPS_0_L),
2073                        (dma_read(CAPS_1_U) << 16) |
2074                        dma_read(CAPS_1_L),
2075                        dma_read(CAPS_2), dma_read(CAPS_3),
2076                        dma_read(CAPS_4));
2077                 if (!enable_1510_mode) {
2078                         u16 w;
2079
2080                         /* Disable OMAP 3.0/3.1 compatibility mode. */
2081                         w = dma_read(GSCR);
2082                         w |= 1 << 3;
2083                         dma_write(w, GSCR);
2084                         dma_chan_count = 16;
2085                 } else
2086                         dma_chan_count = 9;
2087         } else if (cpu_class_is_omap2()) {
2088                 u8 revision = dma_read(REVISION) & 0xff;
2089                 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
2090                        revision >> 4, revision & 0xf);
2091                 dma_chan_count = dma_lch_count;
2092         } else {
2093                 dma_chan_count = 0;
2094                 return 0;
2095         }
2096
2097         spin_lock_init(&dma_chan_lock);
2098
2099         for (ch = 0; ch < dma_chan_count; ch++) {
2100                 omap_clear_dma(ch);
2101                 dma_chan[ch].dev_id = -1;
2102                 dma_chan[ch].next_lch = -1;
2103
2104                 if (ch >= 6 && enable_1510_mode)
2105                         continue;
2106
2107                 if (cpu_class_is_omap1()) {
2108                         /*
2109                          * request_irq() doesn't like dev_id (ie. ch) being
2110                          * zero, so we have to kludge around this.
2111                          */
2112                         r = request_irq(omap1_dma_irq[ch],
2113                                         omap1_dma_irq_handler, 0, "DMA",
2114                                         (void *) (ch + 1));
2115                         if (r != 0) {
2116                                 int i;
2117
2118                                 printk(KERN_ERR "unable to request IRQ %d "
2119                                        "for DMA (error %d)\n",
2120                                        omap1_dma_irq[ch], r);
2121                                 for (i = 0; i < ch; i++)
2122                                         free_irq(omap1_dma_irq[i],
2123                                                  (void *) (i + 1));
2124                                 goto out_free;
2125                         }
2126                 }
2127         }
2128
2129         if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
2130                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2131                                 DMA_DEFAULT_FIFO_DEPTH, 0);
2132
2133         if (cpu_class_is_omap2()) {
2134                 int irq;
2135                 if (cpu_is_omap44xx())
2136                         irq = OMAP44XX_IRQ_SDMA_0;
2137                 else
2138                         irq = INT_24XX_SDMA_IRQ0;
2139                 setup_irq(irq, &omap24xx_dma_irq);
2140         }
2141
2142         if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
2143                 /* Enable smartidle idlemodes and autoidle */
2144                 u32 v = dma_read(OCP_SYSCONFIG);
2145                 v &= ~(DMA_SYSCONFIG_MIDLEMODE_MASK |
2146                                 DMA_SYSCONFIG_SIDLEMODE_MASK |
2147                                 DMA_SYSCONFIG_AUTOIDLE);
2148                 v |= (DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_SMARTIDLE) |
2149                         DMA_SYSCONFIG_SIDLEMODE(DMA_IDLEMODE_SMARTIDLE) |
2150                         DMA_SYSCONFIG_AUTOIDLE);
2151                 dma_write(v , OCP_SYSCONFIG);
2152                 /* reserve dma channels 0 and 1 in high security devices */
2153                 if (cpu_is_omap34xx() &&
2154                         (omap_type() != OMAP2_DEVICE_TYPE_GP)) {
2155                         printk(KERN_INFO "Reserving DMA channels 0 and 1 for "
2156                                         "HS ROM code\n");
2157                         dma_chan[0].dev_id = 0;
2158                         dma_chan[1].dev_id = 1;
2159                 }
2160         }
2161
2162         return 0;
2163
2164 out_free:
2165         kfree(dma_chan);
2166
2167 out_unmap:
2168         iounmap(omap_dma_base);
2169
2170         return r;
2171 }
2172
2173 arch_initcall(omap_init_dma);
2174
2175 /*
2176  * Reserve the omap SDMA channels using cmdline bootarg
2177  * "omap_dma_reserve_ch=". The valid range is 1 to 32
2178  */
2179 static int __init omap_dma_cmdline_reserve_ch(char *str)
2180 {
2181         if (get_option(&str, &omap_dma_reserve_channels) != 1)
2182                 omap_dma_reserve_channels = 0;
2183         return 1;
2184 }
2185
2186 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2187
2188