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  * Support functions for the OMAP internal DMA channels.
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License version 2 as
  17  * published by the Free Software Foundation.
  18  *
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/sched.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/errno.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/irq.h>
  28 #include <linux/io.h>
  29
  30 #include <asm/system.h>
  31 #include <mach/hardware.h>
  32 #include <mach/dma.h>
  33
  34 #include <mach/tc.h>
  35
  36 #undef DEBUG
  37
  38 #ifndef CONFIG_ARCH_OMAP1
  39 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
  40         DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
  41 };
  42
  43 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
  44 #endif
  45
  46 #define OMAP_DMA_ACTIVE                 0x01
  47 #define OMAP_DMA_CCR_EN                 (1 << 7)
  48 #define OMAP2_DMA_CSR_CLEAR_MASK        0xffe
  49
  50 #define OMAP_FUNC_MUX_ARM_BASE          (0xfffe1000 + 0xec)
  51
  52 static int enable_1510_mode;
  53
  54 struct omap_dma_lch {
  55         int next_lch;
  56         int dev_id;
  57         u16 saved_csr;
  58         u16 enabled_irqs;
  59         const char *dev_name;
  60         void (*callback)(int lch, u16 ch_status, void *data);
  61         void *data;
  62
  63 #ifndef CONFIG_ARCH_OMAP1
  64         /* required for Dynamic chaining */
  65         int prev_linked_ch;
  66         int next_linked_ch;
  67         int state;
  68         int chain_id;
  69
  70         int status;
  71 #endif
  72         long flags;
  73 };
  74
  75 struct dma_link_info {
  76         int *linked_dmach_q;
  77         int no_of_lchs_linked;
  78
  79         int q_count;
  80         int q_tail;
  81         int q_head;
  82
  83         int chain_state;
  84         int chain_mode;
  85
  86 };
  87
  88 static struct dma_link_info *dma_linked_lch;
  89
  90 #ifndef CONFIG_ARCH_OMAP1
  91
  92 /* Chain handling macros */
  93 #define OMAP_DMA_CHAIN_QINIT(chain_id)                                  \
  94         do {                                                            \
  95                 dma_linked_lch[chain_id].q_head =                       \
  96                 dma_linked_lch[chain_id].q_tail =                       \
  97                 dma_linked_lch[chain_id].q_count = 0;                   \
  98         } while (0)
  99 #define OMAP_DMA_CHAIN_QFULL(chain_id)                                  \
 100                 (dma_linked_lch[chain_id].no_of_lchs_linked ==          \
 101                 dma_linked_lch[chain_id].q_count)
 102 #define OMAP_DMA_CHAIN_QLAST(chain_id)                                  \
 103         do {                                                            \
 104                 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==      \
 105                 dma_linked_lch[chain_id].q_count)                       \
 106         } while (0)
 107 #define OMAP_DMA_CHAIN_QEMPTY(chain_id)                                 \
 108                 (0 == dma_linked_lch[chain_id].q_count)
 109 #define __OMAP_DMA_CHAIN_INCQ(end)                                      \
 110         ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
 111 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id)                               \
 112         do {                                                            \
 113                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
 114                 dma_linked_lch[chain_id].q_count--;                     \
 115         } while (0)
 116
 117 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id)                               \
 118         do {                                                            \
 119                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
 120                 dma_linked_lch[chain_id].q_count++; \
 121         } while (0)
 122 #endif
 123
 124 static int dma_lch_count;
 125 static int dma_chan_count;
 126 static int omap_dma_reserve_channels;
 127
 128 static spinlock_t dma_chan_lock;
 129 static struct omap_dma_lch *dma_chan;
 130 static void __iomem *omap_dma_base;
 131
 132 static const u8 omap1_dma_irq[OMAP1_LOGICAL_DMA_CH_COUNT] = {
 133         INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
 134         INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
 135         INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
 136         INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
 137         INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
 138 };
 139
 140 static inline void disable_lnk(int lch);
 141 static void omap_disable_channel_irq(int lch);
 142 static inline void omap_enable_channel_irq(int lch);
 143
 144 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 145                                                 __func__);
 146
 147 #define dma_read(reg)                                                   \
 148 ({                                                                      \
 149         u32 __val;                                                      \
 150         if (cpu_class_is_omap1())                                       \
 151                 __val = __raw_readw(omap_dma_base + OMAP1_DMA_##reg);   \
 152         else                                                            \
 153                 __val = __raw_readl(omap_dma_base + OMAP_DMA4_##reg);   \
 154         __val;                                                          \
 155 })
 156
 157 #define dma_write(val, reg)                                             \
 158 ({                                                                      \
 159         if (cpu_class_is_omap1())                                       \
 160                 __raw_writew((u16)(val), omap_dma_base + OMAP1_DMA_##reg); \
 161         else                                                            \
 162                 __raw_writel((val), omap_dma_base + OMAP_DMA4_##reg);   \
 163 })
 164
 165 #ifdef CONFIG_ARCH_OMAP15XX
 166 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 167 int omap_dma_in_1510_mode(void)
 168 {
 169         return enable_1510_mode;
 170 }
 171 #else
 172 #define omap_dma_in_1510_mode()         0
 173 #endif
 174
 175 #ifdef CONFIG_ARCH_OMAP1
 176 static inline int get_gdma_dev(int req)
 177 {
 178         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 179         int shift = ((req - 1) % 5) * 6;
 180
 181         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
 182 }
 183
 184 static inline void set_gdma_dev(int req, int dev)
 185 {
 186         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 187         int shift = ((req - 1) % 5) * 6;
 188         u32 l;
 189
 190         l = omap_readl(reg);
 191         l &= ~(0x3f << shift);
 192         l |= (dev - 1) << shift;
 193         omap_writel(l, reg);
 194 }
 195 #else
 196 #define set_gdma_dev(req, dev)  do {} while (0)
 197 #endif
 198
 199 /* Omap1 only */
 200 static void clear_lch_regs(int lch)
 201 {
 202         int i;
 203         void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch);
 204
 205         for (i = 0; i < 0x2c; i += 2)
 206                 __raw_writew(0, lch_base + i);
 207 }
 208
 209 void omap_set_dma_priority(int lch, int dst_port, int priority)
 210 {
 211         unsigned long reg;
 212         u32 l;
 213
 214         if (cpu_class_is_omap1()) {
 215                 switch (dst_port) {
 216                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 217                         reg = OMAP_TC_OCPT1_PRIOR;
 218                         break;
 219                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 220                         reg = OMAP_TC_OCPT2_PRIOR;
 221                         break;
 222                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 223                         reg = OMAP_TC_EMIFF_PRIOR;
 224                         break;
 225                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 226                         reg = OMAP_TC_EMIFS_PRIOR;
 227                         break;
 228                 default:
 229                         BUG();
 230                         return;
 231                 }
 232                 l = omap_readl(reg);
 233                 l &= ~(0xf << 8);
 234                 l |= (priority & 0xf) << 8;
 235                 omap_writel(l, reg);
 236         }
 237
 238         if (cpu_class_is_omap2()) {
 239                 u32 ccr;
 240
 241                 ccr = dma_read(CCR(lch));
 242                 if (priority)
 243                         ccr |= (1 << 6);
 244                 else
 245                         ccr &= ~(1 << 6);
 246                 dma_write(ccr, CCR(lch));
 247         }
 248 }
 249 EXPORT_SYMBOL(omap_set_dma_priority);
 250
 251 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 252                                   int frame_count, int sync_mode,
 253                                   int dma_trigger, int src_or_dst_synch)
 254 {
 255         u32 l;
 256
 257         l = dma_read(CSDP(lch));
 258         l &= ~0x03;
 259         l |= data_type;
 260         dma_write(l, CSDP(lch));
 261
 262         if (cpu_class_is_omap1()) {
 263                 u16 ccr;
 264
 265                 ccr = dma_read(CCR(lch));
 266                 ccr &= ~(1 << 5);
 267                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 268                         ccr |= 1 << 5;
 269                 dma_write(ccr, CCR(lch));
 270
 271                 ccr = dma_read(CCR2(lch));
 272                 ccr &= ~(1 << 2);
 273                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 274                         ccr |= 1 << 2;
 275                 dma_write(ccr, CCR2(lch));
 276         }
 277
 278         if (cpu_class_is_omap2() && dma_trigger) {
 279                 u32 val;
 280
 281                 val = dma_read(CCR(lch));
 282
 283                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 284                 val &= ~((3 << 19) | 0x1f);
 285                 val |= (dma_trigger & ~0x1f) << 14;
 286                 val |= dma_trigger & 0x1f;
 287
 288                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 289                         val |= 1 << 5;
 290                 else
 291                         val &= ~(1 << 5);
 292
 293                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 294                         val |= 1 << 18;
 295                 else
 296                         val &= ~(1 << 18);
 297
 298                 if (src_or_dst_synch)
 299                         val |= 1 << 24;         /* source synch */
 300                 else
 301                         val &= ~(1 << 24);      /* dest synch */
 302
 303                 dma_write(val, CCR(lch));
 304         }
 305
 306         dma_write(elem_count, CEN(lch));
 307         dma_write(frame_count, CFN(lch));
 308 }
 309 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 310
 311 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 312 {
 313         u16 w;
 314
 315         BUG_ON(omap_dma_in_1510_mode());
 316
 317         if (cpu_class_is_omap2()) {
 318                 REVISIT_24XX();
 319                 return;
 320         }
 321
 322         w = dma_read(CCR2(lch));
 323         w &= ~0x03;
 324
 325         switch (mode) {
 326         case OMAP_DMA_CONSTANT_FILL:
 327                 w |= 0x01;
 328                 break;
 329         case OMAP_DMA_TRANSPARENT_COPY:
 330                 w |= 0x02;
 331                 break;
 332         case OMAP_DMA_COLOR_DIS:
 333                 break;
 334         default:
 335                 BUG();
 336         }
 337         dma_write(w, CCR2(lch));
 338
 339         w = dma_read(LCH_CTRL(lch));
 340         w &= ~0x0f;
 341         /* Default is channel type 2D */
 342         if (mode) {
 343                 dma_write((u16)color, COLOR_L(lch));
 344                 dma_write((u16)(color >> 16), COLOR_U(lch));
 345                 w |= 1;         /* Channel type G */
 346         }
 347         dma_write(w, LCH_CTRL(lch));
 348 }
 349 EXPORT_SYMBOL(omap_set_dma_color_mode);
 350
 351 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 352 {
 353         if (cpu_class_is_omap2()) {
 354                 u32 csdp;
 355
 356                 csdp = dma_read(CSDP(lch));
 357                 csdp &= ~(0x3 << 16);
 358                 csdp |= (mode << 16);
 359                 dma_write(csdp, CSDP(lch));
 360         }
 361 }
 362 EXPORT_SYMBOL(omap_set_dma_write_mode);
 363
 364 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 365 {
 366         if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
 367                 u32 l;
 368
 369                 l = dma_read(LCH_CTRL(lch));
 370                 l &= ~0x7;
 371                 l |= mode;
 372                 dma_write(l, LCH_CTRL(lch));
 373         }
 374 }
 375 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 376
 377 /* Note that src_port is only for omap1 */
 378 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 379                              unsigned long src_start,
 380                              int src_ei, int src_fi)
 381 {
 382         u32 l;
 383
 384         if (cpu_class_is_omap1()) {
 385                 u16 w;
 386
 387                 w = dma_read(CSDP(lch));
 388                 w &= ~(0x1f << 2);
 389                 w |= src_port << 2;
 390                 dma_write(w, CSDP(lch));
 391         }
 392
 393         l = dma_read(CCR(lch));
 394         l &= ~(0x03 << 12);
 395         l |= src_amode << 12;
 396         dma_write(l, CCR(lch));
 397
 398         if (cpu_class_is_omap1()) {
 399                 dma_write(src_start >> 16, CSSA_U(lch));
 400                 dma_write((u16)src_start, CSSA_L(lch));
 401         }
 402
 403         if (cpu_class_is_omap2())
 404                 dma_write(src_start, CSSA(lch));
 405
 406         dma_write(src_ei, CSEI(lch));
 407         dma_write(src_fi, CSFI(lch));
 408 }
 409 EXPORT_SYMBOL(omap_set_dma_src_params);
 410
 411 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 412 {
 413         omap_set_dma_transfer_params(lch, params->data_type,
 414                                      params->elem_count, params->frame_count,
 415                                      params->sync_mode, params->trigger,
 416                                      params->src_or_dst_synch);
 417         omap_set_dma_src_params(lch, params->src_port,
 418                                 params->src_amode, params->src_start,
 419                                 params->src_ei, params->src_fi);
 420
 421         omap_set_dma_dest_params(lch, params->dst_port,
 422                                  params->dst_amode, params->dst_start,
 423                                  params->dst_ei, params->dst_fi);
 424         if (params->read_prio || params->write_prio)
 425                 omap_dma_set_prio_lch(lch, params->read_prio,
 426                                       params->write_prio);
 427 }
 428 EXPORT_SYMBOL(omap_set_dma_params);
 429
 430 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 431 {
 432         if (cpu_class_is_omap2())
 433                 return;
 434
 435         dma_write(eidx, CSEI(lch));
 436         dma_write(fidx, CSFI(lch));
 437 }
 438 EXPORT_SYMBOL(omap_set_dma_src_index);
 439
 440 void omap_set_dma_src_data_pack(int lch, int enable)
 441 {
 442         u32 l;
 443
 444         l = dma_read(CSDP(lch));
 445         l &= ~(1 << 6);
 446         if (enable)
 447                 l |= (1 << 6);
 448         dma_write(l, CSDP(lch));
 449 }
 450 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 451
 452 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 453 {
 454         unsigned int burst = 0;
 455         u32 l;
 456
 457         l = dma_read(CSDP(lch));
 458         l &= ~(0x03 << 7);
 459
 460         switch (burst_mode) {
 461         case OMAP_DMA_DATA_BURST_DIS:
 462                 break;
 463         case OMAP_DMA_DATA_BURST_4:
 464                 if (cpu_class_is_omap2())
 465                         burst = 0x1;
 466                 else
 467                         burst = 0x2;
 468                 break;
 469         case OMAP_DMA_DATA_BURST_8:
 470                 if (cpu_class_is_omap2()) {
 471                         burst = 0x2;
 472                         break;
 473                 }
 474                 /* not supported by current hardware on OMAP1
 475                  * w |= (0x03 << 7);
 476                  * fall through
 477                  */
 478         case OMAP_DMA_DATA_BURST_16:
 479                 if (cpu_class_is_omap2()) {
 480                         burst = 0x3;
 481                         break;
 482                 }
 483                 /* OMAP1 don't support burst 16
 484                  * fall through
 485                  */
 486         default:
 487                 BUG();
 488         }
 489
 490         l |= (burst << 7);
 491         dma_write(l, CSDP(lch));
 492 }
 493 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 494
 495 /* Note that dest_port is only for OMAP1 */
 496 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 497                               unsigned long dest_start,
 498                               int dst_ei, int dst_fi)
 499 {
 500         u32 l;
 501
 502         if (cpu_class_is_omap1()) {
 503                 l = dma_read(CSDP(lch));
 504                 l &= ~(0x1f << 9);
 505                 l |= dest_port << 9;
 506                 dma_write(l, CSDP(lch));
 507         }
 508
 509         l = dma_read(CCR(lch));
 510         l &= ~(0x03 << 14);
 511         l |= dest_amode << 14;
 512         dma_write(l, CCR(lch));
 513
 514         if (cpu_class_is_omap1()) {
 515                 dma_write(dest_start >> 16, CDSA_U(lch));
 516                 dma_write(dest_start, CDSA_L(lch));
 517         }
 518
 519         if (cpu_class_is_omap2())
 520                 dma_write(dest_start, CDSA(lch));
 521
 522         dma_write(dst_ei, CDEI(lch));
 523         dma_write(dst_fi, CDFI(lch));
 524 }
 525 EXPORT_SYMBOL(omap_set_dma_dest_params);
 526
 527 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 528 {
 529         if (cpu_class_is_omap2())
 530                 return;
 531
 532         dma_write(eidx, CDEI(lch));
 533         dma_write(fidx, CDFI(lch));
 534 }
 535 EXPORT_SYMBOL(omap_set_dma_dest_index);
 536
 537 void omap_set_dma_dest_data_pack(int lch, int enable)
 538 {
 539         u32 l;
 540
 541         l = dma_read(CSDP(lch));
 542         l &= ~(1 << 13);
 543         if (enable)
 544                 l |= 1 << 13;
 545         dma_write(l, CSDP(lch));
 546 }
 547 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 548
 549 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 550 {
 551         unsigned int burst = 0;
 552         u32 l;
 553
 554         l = dma_read(CSDP(lch));
 555         l &= ~(0x03 << 14);
 556
 557         switch (burst_mode) {
 558         case OMAP_DMA_DATA_BURST_DIS:
 559                 break;
 560         case OMAP_DMA_DATA_BURST_4:
 561                 if (cpu_class_is_omap2())
 562                         burst = 0x1;
 563                 else
 564                         burst = 0x2;
 565                 break;
 566         case OMAP_DMA_DATA_BURST_8:
 567                 if (cpu_class_is_omap2())
 568                         burst = 0x2;
 569                 else
 570                         burst = 0x3;
 571                 break;
 572         case OMAP_DMA_DATA_BURST_16:
 573                 if (cpu_class_is_omap2()) {
 574                         burst = 0x3;
 575                         break;
 576                 }
 577                 /* OMAP1 don't support burst 16
 578                  * fall through
 579                  */
 580         default:
 581                 printk(KERN_ERR "Invalid DMA burst mode\n");
 582                 BUG();
 583                 return;
 584         }
 585         l |= (burst << 14);
 586         dma_write(l, CSDP(lch));
 587 }
 588 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 589
 590 static inline void omap_enable_channel_irq(int lch)
 591 {
 592         u32 status;
 593
 594         /* Clear CSR */
 595         if (cpu_class_is_omap1())
 596                 status = dma_read(CSR(lch));
 597         else if (cpu_class_is_omap2())
 598                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
 599
 600         /* Enable some nice interrupts. */
 601         dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
 602 }
 603
 604 static void omap_disable_channel_irq(int lch)
 605 {
 606         if (cpu_class_is_omap2())
 607                 dma_write(0, CICR(lch));
 608 }
 609
 610 void omap_enable_dma_irq(int lch, u16 bits)
 611 {
 612         dma_chan[lch].enabled_irqs |= bits;
 613 }
 614 EXPORT_SYMBOL(omap_enable_dma_irq);
 615
 616 void omap_disable_dma_irq(int lch, u16 bits)
 617 {
 618         dma_chan[lch].enabled_irqs &= ~bits;
 619 }
 620 EXPORT_SYMBOL(omap_disable_dma_irq);
 621
 622 static inline void enable_lnk(int lch)
 623 {
 624         u32 l;
 625
 626         l = dma_read(CLNK_CTRL(lch));
 627
 628         if (cpu_class_is_omap1())
 629                 l &= ~(1 << 14);
 630
 631         /* Set the ENABLE_LNK bits */
 632         if (dma_chan[lch].next_lch != -1)
 633                 l = dma_chan[lch].next_lch | (1 << 15);
 634
 635 #ifndef CONFIG_ARCH_OMAP1
 636         if (cpu_class_is_omap2())
 637                 if (dma_chan[lch].next_linked_ch != -1)
 638                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 639 #endif
 640
 641         dma_write(l, CLNK_CTRL(lch));
 642 }
 643
 644 static inline void disable_lnk(int lch)
 645 {
 646         u32 l;
 647
 648         l = dma_read(CLNK_CTRL(lch));
 649
 650         /* Disable interrupts */
 651         if (cpu_class_is_omap1()) {
 652                 dma_write(0, CICR(lch));
 653                 /* Set the STOP_LNK bit */
 654                 l |= 1 << 14;
 655         }
 656
 657         if (cpu_class_is_omap2()) {
 658                 omap_disable_channel_irq(lch);
 659                 /* Clear the ENABLE_LNK bit */
 660                 l &= ~(1 << 15);
 661         }
 662
 663         dma_write(l, CLNK_CTRL(lch));
 664         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 665 }
 666
 667 static inline void omap2_enable_irq_lch(int lch)
 668 {
 669         u32 val;
 670
 671         if (!cpu_class_is_omap2())
 672                 return;
 673
 674         val = dma_read(IRQENABLE_L0);
 675         val |= 1 << lch;
 676         dma_write(val, IRQENABLE_L0);
 677 }
 678
 679 int omap_request_dma(int dev_id, const char *dev_name,
 680                      void (*callback)(int lch, u16 ch_status, void *data),
 681                      void *data, int *dma_ch_out)
 682 {
 683         int ch, free_ch = -1;
 684         unsigned long flags;
 685         struct omap_dma_lch *chan;
 686
 687         spin_lock_irqsave(&dma_chan_lock, flags);
 688         for (ch = 0; ch < dma_chan_count; ch++) {
 689                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 690                         free_ch = ch;
 691                         if (dev_id == 0)
 692                                 break;
 693                 }
 694         }
 695         if (free_ch == -1) {
 696                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 697                 return -EBUSY;
 698         }
 699         chan = dma_chan + free_ch;
 700         chan->dev_id = dev_id;
 701
 702         if (cpu_class_is_omap1())
 703                 clear_lch_regs(free_ch);
 704
 705         if (cpu_class_is_omap2())
 706                 omap_clear_dma(free_ch);
 707
 708         spin_unlock_irqrestore(&dma_chan_lock, flags);
 709
 710         chan->dev_name = dev_name;
 711         chan->callback = callback;
 712         chan->data = data;
 713         chan->flags = 0;
 714
 715 #ifndef CONFIG_ARCH_OMAP1
 716         if (cpu_class_is_omap2()) {
 717                 chan->chain_id = -1;
 718                 chan->next_linked_ch = -1;
 719         }
 720 #endif
 721
 722         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 723
 724         if (cpu_class_is_omap1())
 725                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 726         else if (cpu_class_is_omap2())
 727                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 728                         OMAP2_DMA_TRANS_ERR_IRQ;
 729
 730         if (cpu_is_omap16xx()) {
 731                 /* If the sync device is set, configure it dynamically. */
 732                 if (dev_id != 0) {
 733                         set_gdma_dev(free_ch + 1, dev_id);
 734                         dev_id = free_ch + 1;
 735                 }
 736                 /*
 737                  * Disable the 1510 compatibility mode and set the sync device
 738                  * id.
 739                  */
 740                 dma_write(dev_id | (1 << 10), CCR(free_ch));
 741         } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
 742                 dma_write(dev_id, CCR(free_ch));
 743         }
 744
 745         if (cpu_class_is_omap2()) {
 746                 omap2_enable_irq_lch(free_ch);
 747                 omap_enable_channel_irq(free_ch);
 748                 /* Clear the CSR register and IRQ status register */
 749                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
 750                 dma_write(1 << free_ch, IRQSTATUS_L0);
 751         }
 752
 753         *dma_ch_out = free_ch;
 754
 755         return 0;
 756 }
 757 EXPORT_SYMBOL(omap_request_dma);
 758
 759 void omap_free_dma(int lch)
 760 {
 761         unsigned long flags;
 762
 763         if (dma_chan[lch].dev_id == -1) {
 764                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 765                        lch);
 766                 return;
 767         }
 768
 769         if (cpu_class_is_omap1()) {
 770                 /* Disable all DMA interrupts for the channel. */
 771                 dma_write(0, CICR(lch));
 772                 /* Make sure the DMA transfer is stopped. */
 773                 dma_write(0, CCR(lch));
 774         }
 775
 776         if (cpu_class_is_omap2()) {
 777                 u32 val;
 778                 /* Disable interrupts */
 779                 val = dma_read(IRQENABLE_L0);
 780                 val &= ~(1 << lch);
 781                 dma_write(val, IRQENABLE_L0);
 782
 783                 /* Clear the CSR register and IRQ status register */
 784                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
 785                 dma_write(1 << lch, IRQSTATUS_L0);
 786
 787                 /* Disable all DMA interrupts for the channel. */
 788                 dma_write(0, CICR(lch));
 789
 790                 /* Make sure the DMA transfer is stopped. */
 791                 dma_write(0, CCR(lch));
 792                 omap_clear_dma(lch);
 793         }
 794
 795         spin_lock_irqsave(&dma_chan_lock, flags);
 796         dma_chan[lch].dev_id = -1;
 797         dma_chan[lch].next_lch = -1;
 798         dma_chan[lch].callback = NULL;
 799         spin_unlock_irqrestore(&dma_chan_lock, flags);
 800 }
 801 EXPORT_SYMBOL(omap_free_dma);
 802
 803 /**
 804  * @brief omap_dma_set_global_params : Set global priority settings for dma
 805  *
 806  * @param arb_rate
 807  * @param max_fifo_depth
 808  * @param tparams - Number of thereads to reserve : DMA_THREAD_RESERVE_NORM
 809  *                                                  DMA_THREAD_RESERVE_ONET
 810  *                                                  DMA_THREAD_RESERVE_TWOT
 811  *                                                  DMA_THREAD_RESERVE_THREET
 812  */
 813 void
 814 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 815 {
 816         u32 reg;
 817
 818         if (!cpu_class_is_omap2()) {
 819                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 820                 return;
 821         }
 822
 823         if (arb_rate == 0)
 824                 arb_rate = 1;
 825
 826         reg = (arb_rate & 0xff) << 16;
 827         reg |= (0xff & max_fifo_depth);
 828
 829         dma_write(reg, GCR);
 830 }
 831 EXPORT_SYMBOL(omap_dma_set_global_params);
 832
 833 /**
 834  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 835  *
 836  * @param lch
 837  * @param read_prio - Read priority
 838  * @param write_prio - Write priority
 839  * Both of the above can be set with one of the following values :
 840  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 841  */
 842 int
 843 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 844                       unsigned char write_prio)
 845 {
 846         u32 l;
 847
 848         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 849                 printk(KERN_ERR "Invalid channel id\n");
 850                 return -EINVAL;
 851         }
 852         l = dma_read(CCR(lch));
 853         l &= ~((1 << 6) | (1 << 26));
 854         if (cpu_is_omap2430() || cpu_is_omap34xx())
 855                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 856         else
 857                 l |= ((read_prio & 0x1) << 6);
 858
 859         dma_write(l, CCR(lch));
 860
 861         return 0;
 862 }
 863 EXPORT_SYMBOL(omap_dma_set_prio_lch);
 864
 865 /*
 866  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 867  * through omap_start_dma(). Any buffers in flight are discarded.
 868  */
 869 void omap_clear_dma(int lch)
 870 {
 871         unsigned long flags;
 872
 873         local_irq_save(flags);
 874
 875         if (cpu_class_is_omap1()) {
 876                 u32 l;
 877
 878                 l = dma_read(CCR(lch));
 879                 l &= ~OMAP_DMA_CCR_EN;
 880                 dma_write(l, CCR(lch));
 881
 882                 /* Clear pending interrupts */
 883                 l = dma_read(CSR(lch));
 884         }
 885
 886         if (cpu_class_is_omap2()) {
 887                 int i;
 888                 void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch);
 889                 for (i = 0; i < 0x44; i += 4)
 890                         __raw_writel(0, lch_base + i);
 891         }
 892
 893         local_irq_restore(flags);
 894 }
 895 EXPORT_SYMBOL(omap_clear_dma);
 896
 897 void omap_start_dma(int lch)
 898 {
 899         u32 l;
 900
 901         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 902                 int next_lch, cur_lch;
 903                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
 904
 905                 dma_chan_link_map[lch] = 1;
 906                 /* Set the link register of the first channel */
 907                 enable_lnk(lch);
 908
 909                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 910                 cur_lch = dma_chan[lch].next_lch;
 911                 do {
 912                         next_lch = dma_chan[cur_lch].next_lch;
 913
 914                         /* The loop case: we've been here already */
 915                         if (dma_chan_link_map[cur_lch])
 916                                 break;
 917                         /* Mark the current channel */
 918                         dma_chan_link_map[cur_lch] = 1;
 919
 920                         enable_lnk(cur_lch);
 921                         omap_enable_channel_irq(cur_lch);
 922
 923                         cur_lch = next_lch;
 924                 } while (next_lch != -1);
 925         } else if (cpu_class_is_omap2()) {
 926                 /* Errata: Need to write lch even if not using chaining */
 927                 dma_write(lch, CLNK_CTRL(lch));
 928         }
 929
 930         omap_enable_channel_irq(lch);
 931
 932         l = dma_read(CCR(lch));
 933
 934         /*
 935          * Errata: On ES2.0 BUFFERING disable must be set.
 936          * This will always fail on ES1.0
 937          */
 938         if (cpu_is_omap24xx())
 939                 l |= OMAP_DMA_CCR_EN;
 940
 941         l |= OMAP_DMA_CCR_EN;
 942         dma_write(l, CCR(lch));
 943
 944         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 945 }
 946 EXPORT_SYMBOL(omap_start_dma);
 947
 948 void omap_stop_dma(int lch)
 949 {
 950         u32 l;
 951
 952         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 953                 int next_lch, cur_lch = lch;
 954                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
 955
 956                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 957                 do {
 958                         /* The loop case: we've been here already */
 959                         if (dma_chan_link_map[cur_lch])
 960                                 break;
 961                         /* Mark the current channel */
 962                         dma_chan_link_map[cur_lch] = 1;
 963
 964                         disable_lnk(cur_lch);
 965
 966                         next_lch = dma_chan[cur_lch].next_lch;
 967                         cur_lch = next_lch;
 968                 } while (next_lch != -1);
 969
 970                 return;
 971         }
 972
 973         /* Disable all interrupts on the channel */
 974         if (cpu_class_is_omap1())
 975                 dma_write(0, CICR(lch));
 976
 977         l = dma_read(CCR(lch));
 978         l &= ~OMAP_DMA_CCR_EN;
 979         dma_write(l, CCR(lch));
 980
 981         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 982 }
 983 EXPORT_SYMBOL(omap_stop_dma);
 984
 985 /*
 986  * Allows changing the DMA callback function or data. This may be needed if
 987  * the driver shares a single DMA channel for multiple dma triggers.
 988  */
 989 int omap_set_dma_callback(int lch,
 990                           void (*callback)(int lch, u16 ch_status, void *data),
 991                           void *data)
 992 {
 993         unsigned long flags;
 994
 995         if (lch < 0)
 996                 return -ENODEV;
 997
 998         spin_lock_irqsave(&dma_chan_lock, flags);
 999         if (dma_chan[lch].dev_id == -1) {
1000                 printk(KERN_ERR "DMA callback for not set for free channel\n");
1001                 spin_unlock_irqrestore(&dma_chan_lock, flags);
1002                 return -EINVAL;
1003         }
1004         dma_chan[lch].callback = callback;
1005         dma_chan[lch].data = data;
1006         spin_unlock_irqrestore(&dma_chan_lock, flags);
1007
1008         return 0;
1009 }
1010 EXPORT_SYMBOL(omap_set_dma_callback);
1011
1012 /*
1013  * Returns current physical source address for the given DMA channel.
1014  * If the channel is running the caller must disable interrupts prior calling
1015  * this function and process the returned value before re-enabling interrupt to
1016  * prevent races with the interrupt handler. Note that in continuous mode there
1017  * is a chance for CSSA_L register overflow inbetween the two reads resulting
1018  * in incorrect return value.
1019  */
1020 dma_addr_t omap_get_dma_src_pos(int lch)
1021 {
1022         dma_addr_t offset = 0;
1023
1024         if (cpu_is_omap15xx())
1025                 offset = dma_read(CPC(lch));
1026         else
1027                 offset = dma_read(CSAC(lch));
1028
1029         /*
1030          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1031          * read before the DMA controller finished disabling the channel.
1032          */
1033         if (!cpu_is_omap15xx() && offset == 0)
1034                 offset = dma_read(CSAC(lch));
1035
1036         if (cpu_class_is_omap1())
1037                 offset |= (dma_read(CSSA_U(lch)) << 16);
1038
1039         return offset;
1040 }
1041 EXPORT_SYMBOL(omap_get_dma_src_pos);
1042
1043 /*
1044  * Returns current physical destination address for the given DMA channel.
1045  * If the channel is running the caller must disable interrupts prior calling
1046  * this function and process the returned value before re-enabling interrupt to
1047  * prevent races with the interrupt handler. Note that in continuous mode there
1048  * is a chance for CDSA_L register overflow inbetween the two reads resulting
1049  * in incorrect return value.
1050  */
1051 dma_addr_t omap_get_dma_dst_pos(int lch)
1052 {
1053         dma_addr_t offset = 0;
1054
1055         if (cpu_is_omap15xx())
1056                 offset = dma_read(CPC(lch));
1057         else
1058                 offset = dma_read(CDAC(lch));
1059
1060         /*
1061          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1062          * read before the DMA controller finished disabling the channel.
1063          */
1064         if (!cpu_is_omap15xx() && offset == 0)
1065                 offset = dma_read(CDAC(lch));
1066
1067         if (cpu_class_is_omap1())
1068                 offset |= (dma_read(CDSA_U(lch)) << 16);
1069
1070         return offset;
1071 }
1072 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1073
1074 int omap_get_dma_active_status(int lch)
1075 {
1076         return (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN) != 0;
1077 }
1078 EXPORT_SYMBOL(omap_get_dma_active_status);
1079
1080 int omap_dma_running(void)
1081 {
1082         int lch;
1083
1084         /* Check if LCD DMA is running */
1085         if (cpu_is_omap16xx())
1086                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
1087                         return 1;
1088
1089         for (lch = 0; lch < dma_chan_count; lch++)
1090                 if (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                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1105                 BUG();
1106                 return;
1107         }
1108
1109         if ((dma_chan[lch_head].dev_id == -1) ||
1110             (dma_chan[lch_queue].dev_id == -1)) {
1111                 printk(KERN_ERR "omap_dma: trying to link "
1112                        "non requested channels\n");
1113                 dump_stack();
1114         }
1115
1116         dma_chan[lch_head].next_lch = lch_queue;
1117 }
1118 EXPORT_SYMBOL(omap_dma_link_lch);
1119
1120 /*
1121  * Once the DMA queue is stopped, we can destroy it.
1122  */
1123 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1124 {
1125         if (omap_dma_in_1510_mode()) {
1126                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1127                 BUG();
1128                 return;
1129         }
1130
1131         if (dma_chan[lch_head].next_lch != lch_queue ||
1132             dma_chan[lch_head].next_lch == -1) {
1133                 printk(KERN_ERR "omap_dma: trying to unlink "
1134                        "non linked channels\n");
1135                 dump_stack();
1136         }
1137
1138         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1139             (dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
1140                 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1141                        "before unlinking\n");
1142                 dump_stack();
1143         }
1144
1145         dma_chan[lch_head].next_lch = -1;
1146 }
1147 EXPORT_SYMBOL(omap_dma_unlink_lch);
1148
1149 /*----------------------------------------------------------------------------*/
1150
1151 #ifndef CONFIG_ARCH_OMAP1
1152 /* Create chain of DMA channesls */
1153 static void create_dma_lch_chain(int lch_head, int lch_queue)
1154 {
1155         u32 l;
1156
1157         /* Check if this is the first link in chain */
1158         if (dma_chan[lch_head].next_linked_ch == -1) {
1159                 dma_chan[lch_head].next_linked_ch = lch_queue;
1160                 dma_chan[lch_head].prev_linked_ch = lch_queue;
1161                 dma_chan[lch_queue].next_linked_ch = lch_head;
1162                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1163         }
1164
1165         /* a link exists, link the new channel in circular chain */
1166         else {
1167                 dma_chan[lch_queue].next_linked_ch =
1168                                         dma_chan[lch_head].next_linked_ch;
1169                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1170                 dma_chan[lch_head].next_linked_ch = lch_queue;
1171                 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1172                                         lch_queue;
1173         }
1174
1175         l = dma_read(CLNK_CTRL(lch_head));
1176         l &= ~(0x1f);
1177         l |= lch_queue;
1178         dma_write(l, CLNK_CTRL(lch_head));
1179
1180         l = dma_read(CLNK_CTRL(lch_queue));
1181         l &= ~(0x1f);
1182         l |= (dma_chan[lch_queue].next_linked_ch);
1183         dma_write(l, CLNK_CTRL(lch_queue));
1184 }
1185
1186 /**
1187  * @brief omap_request_dma_chain : Request a chain of DMA channels
1188  *
1189  * @param dev_id - Device id using the dma channel
1190  * @param dev_name - Device name
1191  * @param callback - Call back function
1192  * @chain_id -
1193  * @no_of_chans - Number of channels requested
1194  * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1195  *                                            OMAP_DMA_DYNAMIC_CHAIN
1196  * @params - Channel parameters
1197  *
1198  * @return - Succes : 0
1199  *           Failure: -EINVAL/-ENOMEM
1200  */
1201 int omap_request_dma_chain(int dev_id, const char *dev_name,
1202                            void (*callback) (int chain_id, u16 ch_status,
1203                                              void *data),
1204                            int *chain_id, int no_of_chans, int chain_mode,
1205                            struct omap_dma_channel_params params)
1206 {
1207         int *channels;
1208         int i, err;
1209
1210         /* Is the chain mode valid ? */
1211         if (chain_mode != OMAP_DMA_STATIC_CHAIN
1212                         && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1213                 printk(KERN_ERR "Invalid chain mode requested\n");
1214                 return -EINVAL;
1215         }
1216
1217         if (unlikely((no_of_chans < 1
1218                         || no_of_chans > dma_lch_count))) {
1219                 printk(KERN_ERR "Invalid Number of channels requested\n");
1220                 return -EINVAL;
1221         }
1222
1223         /* Allocate a queue to maintain the status of the channels
1224          * in the chain */
1225         channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1226         if (channels == NULL) {
1227                 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1228                 return -ENOMEM;
1229         }
1230
1231         /* request and reserve DMA channels for the chain */
1232         for (i = 0; i < no_of_chans; i++) {
1233                 err = omap_request_dma(dev_id, dev_name,
1234                                         callback, NULL, &channels[i]);
1235                 if (err < 0) {
1236                         int j;
1237                         for (j = 0; j < i; j++)
1238                                 omap_free_dma(channels[j]);
1239                         kfree(channels);
1240                         printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1241                         return err;
1242                 }
1243                 dma_chan[channels[i]].prev_linked_ch = -1;
1244                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1245
1246                 /*
1247                  * Allowing client drivers to set common parameters now,
1248                  * so that later only relevant (src_start, dest_start
1249                  * and element count) can be set
1250                  */
1251                 omap_set_dma_params(channels[i], &params);
1252         }
1253
1254         *chain_id = channels[0];
1255         dma_linked_lch[*chain_id].linked_dmach_q = channels;
1256         dma_linked_lch[*chain_id].chain_mode = chain_mode;
1257         dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1258         dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1259
1260         for (i = 0; i < no_of_chans; i++)
1261                 dma_chan[channels[i]].chain_id = *chain_id;
1262
1263         /* Reset the Queue pointers */
1264         OMAP_DMA_CHAIN_QINIT(*chain_id);
1265
1266         /* Set up the chain */
1267         if (no_of_chans == 1)
1268                 create_dma_lch_chain(channels[0], channels[0]);
1269         else {
1270                 for (i = 0; i < (no_of_chans - 1); i++)
1271                         create_dma_lch_chain(channels[i], channels[i + 1]);
1272         }
1273
1274         return 0;
1275 }
1276 EXPORT_SYMBOL(omap_request_dma_chain);
1277
1278 /**
1279  * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1280  * params after setting it. Dont do this while dma is running!!
1281  *
1282  * @param chain_id - Chained logical channel id.
1283  * @param params
1284  *
1285  * @return - Success : 0
1286  *           Failure : -EINVAL
1287  */
1288 int omap_modify_dma_chain_params(int chain_id,
1289                                 struct omap_dma_channel_params params)
1290 {
1291         int *channels;
1292         u32 i;
1293
1294         /* Check for input params */
1295         if (unlikely((chain_id < 0
1296                         || chain_id >= dma_lch_count))) {
1297                 printk(KERN_ERR "Invalid chain id\n");
1298                 return -EINVAL;
1299         }
1300
1301         /* Check if the chain exists */
1302         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1303                 printk(KERN_ERR "Chain doesn't exists\n");
1304                 return -EINVAL;
1305         }
1306         channels = dma_linked_lch[chain_id].linked_dmach_q;
1307
1308         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1309                 /*
1310                  * Allowing client drivers to set common parameters now,
1311                  * so that later only relevant (src_start, dest_start
1312                  * and element count) can be set
1313                  */
1314                 omap_set_dma_params(channels[i], &params);
1315         }
1316
1317         return 0;
1318 }
1319 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1320
1321 /**
1322  * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1323  *
1324  * @param chain_id
1325  *
1326  * @return - Success : 0
1327  *           Failure : -EINVAL
1328  */
1329 int omap_free_dma_chain(int chain_id)
1330 {
1331         int *channels;
1332         u32 i;
1333
1334         /* Check for input params */
1335         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1336                 printk(KERN_ERR "Invalid chain id\n");
1337                 return -EINVAL;
1338         }
1339
1340         /* Check if the chain exists */
1341         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1342                 printk(KERN_ERR "Chain doesn't exists\n");
1343                 return -EINVAL;
1344         }
1345
1346         channels = dma_linked_lch[chain_id].linked_dmach_q;
1347         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1348                 dma_chan[channels[i]].next_linked_ch = -1;
1349                 dma_chan[channels[i]].prev_linked_ch = -1;
1350                 dma_chan[channels[i]].chain_id = -1;
1351                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1352                 omap_free_dma(channels[i]);
1353         }
1354
1355         kfree(channels);
1356
1357         dma_linked_lch[chain_id].linked_dmach_q = NULL;
1358         dma_linked_lch[chain_id].chain_mode = -1;
1359         dma_linked_lch[chain_id].chain_state = -1;
1360
1361         return (0);
1362 }
1363 EXPORT_SYMBOL(omap_free_dma_chain);
1364
1365 /**
1366  * @brief omap_dma_chain_status - Check if the chain is in
1367  * active / inactive state.
1368  * @param chain_id
1369  *
1370  * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1371  *           Failure : -EINVAL
1372  */
1373 int omap_dma_chain_status(int chain_id)
1374 {
1375         /* Check for input params */
1376         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1377                 printk(KERN_ERR "Invalid chain id\n");
1378                 return -EINVAL;
1379         }
1380
1381         /* Check if the chain exists */
1382         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1383                 printk(KERN_ERR "Chain doesn't exists\n");
1384                 return -EINVAL;
1385         }
1386         pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1387                         dma_linked_lch[chain_id].q_count);
1388
1389         if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1390                 return OMAP_DMA_CHAIN_INACTIVE;
1391
1392         return OMAP_DMA_CHAIN_ACTIVE;
1393 }
1394 EXPORT_SYMBOL(omap_dma_chain_status);
1395
1396 /**
1397  * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1398  * set the params and start the transfer.
1399  *
1400  * @param chain_id
1401  * @param src_start - buffer start address
1402  * @param dest_start - Dest address
1403  * @param elem_count
1404  * @param frame_count
1405  * @param callbk_data - channel callback parameter data.
1406  *
1407  * @return  - Success : 0
1408  *            Failure: -EINVAL/-EBUSY
1409  */
1410 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1411                         int elem_count, int frame_count, void *callbk_data)
1412 {
1413         int *channels;
1414         u32 l, lch;
1415         int start_dma = 0;
1416
1417         /*
1418          * if buffer size is less than 1 then there is
1419          * no use of starting the chain
1420          */
1421         if (elem_count < 1) {
1422                 printk(KERN_ERR "Invalid buffer size\n");
1423                 return -EINVAL;
1424         }
1425
1426         /* Check for input params */
1427         if (unlikely((chain_id < 0
1428                         || chain_id >= dma_lch_count))) {
1429                 printk(KERN_ERR "Invalid chain id\n");
1430                 return -EINVAL;
1431         }
1432
1433         /* Check if the chain exists */
1434         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1435                 printk(KERN_ERR "Chain doesn't exist\n");
1436                 return -EINVAL;
1437         }
1438
1439         /* Check if all the channels in chain are in use */
1440         if (OMAP_DMA_CHAIN_QFULL(chain_id))
1441                 return -EBUSY;
1442
1443         /* Frame count may be negative in case of indexed transfers */
1444         channels = dma_linked_lch[chain_id].linked_dmach_q;
1445
1446         /* Get a free channel */
1447         lch = channels[dma_linked_lch[chain_id].q_tail];
1448
1449         /* Store the callback data */
1450         dma_chan[lch].data = callbk_data;
1451
1452         /* Increment the q_tail */
1453         OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1454
1455         /* Set the params to the free channel */
1456         if (src_start != 0)
1457                 dma_write(src_start, CSSA(lch));
1458         if (dest_start != 0)
1459                 dma_write(dest_start, CDSA(lch));
1460
1461         /* Write the buffer size */
1462         dma_write(elem_count, CEN(lch));
1463         dma_write(frame_count, CFN(lch));
1464
1465         /*
1466          * If the chain is dynamically linked,
1467          * then we may have to start the chain if its not active
1468          */
1469         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1470
1471                 /*
1472                  * In Dynamic chain, if the chain is not started,
1473                  * queue the channel
1474                  */
1475                 if (dma_linked_lch[chain_id].chain_state ==
1476                                                 DMA_CHAIN_NOTSTARTED) {
1477                         /* Enable the link in previous channel */
1478                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1479                                                                 DMA_CH_QUEUED)
1480                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1481                         dma_chan[lch].state = DMA_CH_QUEUED;
1482                 }
1483
1484                 /*
1485                  * Chain is already started, make sure its active,
1486                  * if not then start the chain
1487                  */
1488                 else {
1489                         start_dma = 1;
1490
1491                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1492                                                         DMA_CH_STARTED) {
1493                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1494                                 dma_chan[lch].state = DMA_CH_QUEUED;
1495                                 start_dma = 0;
1496                                 if (0 == ((1 << 7) & dma_read(
1497                                         CCR(dma_chan[lch].prev_linked_ch)))) {
1498                                         disable_lnk(dma_chan[lch].
1499                                                     prev_linked_ch);
1500                                         pr_debug("\n prev ch is stopped\n");
1501                                         start_dma = 1;
1502                                 }
1503                         }
1504
1505                         else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1506                                                         == DMA_CH_QUEUED) {
1507                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1508                                 dma_chan[lch].state = DMA_CH_QUEUED;
1509                                 start_dma = 0;
1510                         }
1511                         omap_enable_channel_irq(lch);
1512
1513                         l = dma_read(CCR(lch));
1514
1515                         if ((0 == (l & (1 << 24))))
1516                                 l &= ~(1 << 25);
1517                         else
1518                                 l |= (1 << 25);
1519                         if (start_dma == 1) {
1520                                 if (0 == (l & (1 << 7))) {
1521                                         l |= (1 << 7);
1522                                         dma_chan[lch].state = DMA_CH_STARTED;
1523                                         pr_debug("starting %d\n", lch);
1524                                         dma_write(l, CCR(lch));
1525                                 } else
1526                                         start_dma = 0;
1527                         } else {
1528                                 if (0 == (l & (1 << 7)))
1529                                         dma_write(l, CCR(lch));
1530                         }
1531                         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1532                 }
1533         }
1534
1535         return 0;
1536 }
1537 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1538
1539 /**
1540  * @brief omap_start_dma_chain_transfers - Start the chain
1541  *
1542  * @param chain_id
1543  *
1544  * @return - Success : 0
1545  *           Failure : -EINVAL/-EBUSY
1546  */
1547 int omap_start_dma_chain_transfers(int chain_id)
1548 {
1549         int *channels;
1550         u32 l, i;
1551
1552         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1553                 printk(KERN_ERR "Invalid chain id\n");
1554                 return -EINVAL;
1555         }
1556
1557         channels = dma_linked_lch[chain_id].linked_dmach_q;
1558
1559         if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1560                 printk(KERN_ERR "Chain is already started\n");
1561                 return -EBUSY;
1562         }
1563
1564         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1565                 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1566                                                                         i++) {
1567                         enable_lnk(channels[i]);
1568                         omap_enable_channel_irq(channels[i]);
1569                 }
1570         } else {
1571                 omap_enable_channel_irq(channels[0]);
1572         }
1573
1574         l = dma_read(CCR(channels[0]));
1575         l |= (1 << 7);
1576         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1577         dma_chan[channels[0]].state = DMA_CH_STARTED;
1578
1579         if ((0 == (l & (1 << 24))))
1580                 l &= ~(1 << 25);
1581         else
1582                 l |= (1 << 25);
1583         dma_write(l, CCR(channels[0]));
1584
1585         dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1586
1587         return 0;
1588 }
1589 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1590
1591 /**
1592  * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1593  *
1594  * @param chain_id
1595  *
1596  * @return - Success : 0
1597  *           Failure : EINVAL
1598  */
1599 int omap_stop_dma_chain_transfers(int chain_id)
1600 {
1601         int *channels;
1602         u32 l, i;
1603         u32 sys_cf;
1604
1605         /* Check for input params */
1606         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1607                 printk(KERN_ERR "Invalid chain id\n");
1608                 return -EINVAL;
1609         }
1610
1611         /* Check if the chain exists */
1612         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1613                 printk(KERN_ERR "Chain doesn't exists\n");
1614                 return -EINVAL;
1615         }
1616         channels = dma_linked_lch[chain_id].linked_dmach_q;
1617
1618         /*
1619          * DMA Errata:
1620          * Special programming model needed to disable DMA before end of block
1621          */
1622         sys_cf = dma_read(OCP_SYSCONFIG);
1623         l = sys_cf;
1624         /* Middle mode reg set no Standby */
1625         l &= ~((1 << 12)|(1 << 13));
1626         dma_write(l, OCP_SYSCONFIG);
1627
1628         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1629
1630                 /* Stop the Channel transmission */
1631                 l = dma_read(CCR(channels[i]));
1632                 l &= ~(1 << 7);
1633                 dma_write(l, CCR(channels[i]));
1634
1635                 /* Disable the link in all the channels */
1636                 disable_lnk(channels[i]);
1637                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1638
1639         }
1640         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1641
1642         /* Reset the Queue pointers */
1643         OMAP_DMA_CHAIN_QINIT(chain_id);
1644
1645         /* Errata - put in the old value */
1646         dma_write(sys_cf, OCP_SYSCONFIG);
1647
1648         return 0;
1649 }
1650 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1651
1652 /* Get the index of the ongoing DMA in chain */
1653 /**
1654  * @brief omap_get_dma_chain_index - Get the element and frame index
1655  * of the ongoing DMA in chain
1656  *
1657  * @param chain_id
1658  * @param ei - Element index
1659  * @param fi - Frame index
1660  *
1661  * @return - Success : 0
1662  *           Failure : -EINVAL
1663  */
1664 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1665 {
1666         int lch;
1667         int *channels;
1668
1669         /* Check for input params */
1670         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1671                 printk(KERN_ERR "Invalid chain id\n");
1672                 return -EINVAL;
1673         }
1674
1675         /* Check if the chain exists */
1676         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1677                 printk(KERN_ERR "Chain doesn't exists\n");
1678                 return -EINVAL;
1679         }
1680         if ((!ei) || (!fi))
1681                 return -EINVAL;
1682
1683         channels = dma_linked_lch[chain_id].linked_dmach_q;
1684
1685         /* Get the current channel */
1686         lch = channels[dma_linked_lch[chain_id].q_head];
1687
1688         *ei = dma_read(CCEN(lch));
1689         *fi = dma_read(CCFN(lch));
1690
1691         return 0;
1692 }
1693 EXPORT_SYMBOL(omap_get_dma_chain_index);
1694
1695 /**
1696  * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1697  * ongoing DMA in chain
1698  *
1699  * @param chain_id
1700  *
1701  * @return - Success : Destination position
1702  *           Failure : -EINVAL
1703  */
1704 int omap_get_dma_chain_dst_pos(int chain_id)
1705 {
1706         int lch;
1707         int *channels;
1708
1709         /* Check for input params */
1710         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1711                 printk(KERN_ERR "Invalid chain id\n");
1712                 return -EINVAL;
1713         }
1714
1715         /* Check if the chain exists */
1716         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1717                 printk(KERN_ERR "Chain doesn't exists\n");
1718                 return -EINVAL;
1719         }
1720
1721         channels = dma_linked_lch[chain_id].linked_dmach_q;
1722
1723         /* Get the current channel */
1724         lch = channels[dma_linked_lch[chain_id].q_head];
1725
1726         return dma_read(CDAC(lch));
1727 }
1728 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1729
1730 /**
1731  * @brief omap_get_dma_chain_src_pos - Get the source position
1732  * of the ongoing DMA in chain
1733  * @param chain_id
1734  *
1735  * @return - Success : Destination position
1736  *           Failure : -EINVAL
1737  */
1738 int omap_get_dma_chain_src_pos(int chain_id)
1739 {
1740         int lch;
1741         int *channels;
1742
1743         /* Check for input params */
1744         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1745                 printk(KERN_ERR "Invalid chain id\n");
1746                 return -EINVAL;
1747         }
1748
1749         /* Check if the chain exists */
1750         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1751                 printk(KERN_ERR "Chain doesn't exists\n");
1752                 return -EINVAL;
1753         }
1754
1755         channels = dma_linked_lch[chain_id].linked_dmach_q;
1756
1757         /* Get the current channel */
1758         lch = channels[dma_linked_lch[chain_id].q_head];
1759
1760         return dma_read(CSAC(lch));
1761 }
1762 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1763 #endif  /* ifndef CONFIG_ARCH_OMAP1 */
1764
1765 /*----------------------------------------------------------------------------*/
1766
1767 #ifdef CONFIG_ARCH_OMAP1
1768
1769 static int omap1_dma_handle_ch(int ch)
1770 {
1771         u32 csr;
1772
1773         if (enable_1510_mode && ch >= 6) {
1774                 csr = dma_chan[ch].saved_csr;
1775                 dma_chan[ch].saved_csr = 0;
1776         } else
1777                 csr = dma_read(CSR(ch));
1778         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1779                 dma_chan[ch + 6].saved_csr = csr >> 7;
1780                 csr &= 0x7f;
1781         }
1782         if ((csr & 0x3f) == 0)
1783                 return 0;
1784         if (unlikely(dma_chan[ch].dev_id == -1)) {
1785                 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1786                        "%d (CSR %04x)\n", ch, csr);
1787                 return 0;
1788         }
1789         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1790                 printk(KERN_WARNING "DMA timeout with device %d\n",
1791                        dma_chan[ch].dev_id);
1792         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1793                 printk(KERN_WARNING "DMA synchronization event drop occurred "
1794                        "with device %d\n", dma_chan[ch].dev_id);
1795         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1796                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1797         if (likely(dma_chan[ch].callback != NULL))
1798                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1799
1800         return 1;
1801 }
1802
1803 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1804 {
1805         int ch = ((int) dev_id) - 1;
1806         int handled = 0;
1807
1808         for (;;) {
1809                 int handled_now = 0;
1810
1811                 handled_now += omap1_dma_handle_ch(ch);
1812                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1813                         handled_now += omap1_dma_handle_ch(ch + 6);
1814                 if (!handled_now)
1815                         break;
1816                 handled += handled_now;
1817         }
1818
1819         return handled ? IRQ_HANDLED : IRQ_NONE;
1820 }
1821
1822 #else
1823 #define omap1_dma_irq_handler   NULL
1824 #endif
1825
1826 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1827
1828 static int omap2_dma_handle_ch(int ch)
1829 {
1830         u32 status = dma_read(CSR(ch));
1831
1832         if (!status) {
1833                 if (printk_ratelimit())
1834                         printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1835                                 ch);
1836                 dma_write(1 << ch, IRQSTATUS_L0);
1837                 return 0;
1838         }
1839         if (unlikely(dma_chan[ch].dev_id == -1)) {
1840                 if (printk_ratelimit())
1841                         printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1842                                         "channel %d\n", status, ch);
1843                 return 0;
1844         }
1845         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1846                 printk(KERN_INFO
1847                        "DMA synchronization event drop occurred with device "
1848                        "%d\n", dma_chan[ch].dev_id);
1849         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1850                 printk(KERN_INFO "DMA transaction error with device %d\n",
1851                        dma_chan[ch].dev_id);
1852                 if (cpu_class_is_omap2()) {
1853                         /* Errata: sDMA Channel is not disabled
1854                          * after a transaction error. So we explicitely
1855                          * disable the channel
1856                          */
1857                         u32 ccr;
1858
1859                         ccr = dma_read(CCR(ch));
1860                         ccr &= ~OMAP_DMA_CCR_EN;
1861                         dma_write(ccr, CCR(ch));
1862                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1863                 }
1864         }
1865         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1866                 printk(KERN_INFO "DMA secure error with device %d\n",
1867                        dma_chan[ch].dev_id);
1868         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1869                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1870                        dma_chan[ch].dev_id);
1871
1872         dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
1873         dma_write(1 << ch, IRQSTATUS_L0);
1874
1875         /* If the ch is not chained then chain_id will be -1 */
1876         if (dma_chan[ch].chain_id != -1) {
1877                 int chain_id = dma_chan[ch].chain_id;
1878                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1879                 if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
1880                         dma_chan[dma_chan[ch].next_linked_ch].state =
1881                                                         DMA_CH_STARTED;
1882                 if (dma_linked_lch[chain_id].chain_mode ==
1883                                                 OMAP_DMA_DYNAMIC_CHAIN)
1884                         disable_lnk(ch);
1885
1886                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1887                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1888
1889                 status = dma_read(CSR(ch));
1890         }
1891
1892         dma_write(status, CSR(ch));
1893
1894         if (likely(dma_chan[ch].callback != NULL))
1895                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1896
1897         return 0;
1898 }
1899
1900 /* STATUS register count is from 1-32 while our is 0-31 */
1901 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1902 {
1903         u32 val, enable_reg;
1904         int i;
1905
1906         val = dma_read(IRQSTATUS_L0);
1907         if (val == 0) {
1908                 if (printk_ratelimit())
1909                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1910                 return IRQ_HANDLED;
1911         }
1912         enable_reg = dma_read(IRQENABLE_L0);
1913         val &= enable_reg; /* Dispatch only relevant interrupts */
1914         for (i = 0; i < dma_lch_count && val != 0; i++) {
1915                 if (val & 1)
1916                         omap2_dma_handle_ch(i);
1917                 val >>= 1;
1918         }
1919
1920         return IRQ_HANDLED;
1921 }
1922
1923 static struct irqaction omap24xx_dma_irq = {
1924         .name = "DMA",
1925         .handler = omap2_dma_irq_handler,
1926         .flags = IRQF_DISABLED
1927 };
1928
1929 #else
1930 static struct irqaction omap24xx_dma_irq;
1931 #endif
1932
1933 /*----------------------------------------------------------------------------*/
1934
1935 static struct lcd_dma_info {
1936         spinlock_t lock;
1937         int reserved;
1938         void (*callback)(u16 status, void *data);
1939         void *cb_data;
1940
1941         int active;
1942         unsigned long addr, size;
1943         int rotate, data_type, xres, yres;
1944         int vxres;
1945         int mirror;
1946         int xscale, yscale;
1947         int ext_ctrl;
1948         int src_port;
1949         int single_transfer;
1950 } lcd_dma;
1951
1952 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
1953                          int data_type)
1954 {
1955         lcd_dma.addr = addr;
1956         lcd_dma.data_type = data_type;
1957         lcd_dma.xres = fb_xres;
1958         lcd_dma.yres = fb_yres;
1959 }
1960 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
1961
1962 void omap_set_lcd_dma_src_port(int port)
1963 {
1964         lcd_dma.src_port = port;
1965 }
1966
1967 void omap_set_lcd_dma_ext_controller(int external)
1968 {
1969         lcd_dma.ext_ctrl = external;
1970 }
1971 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
1972
1973 void omap_set_lcd_dma_single_transfer(int single)
1974 {
1975         lcd_dma.single_transfer = single;
1976 }
1977 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
1978
1979 void omap_set_lcd_dma_b1_rotation(int rotate)
1980 {
1981         if (omap_dma_in_1510_mode()) {
1982                 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
1983                 BUG();
1984                 return;
1985         }
1986         lcd_dma.rotate = rotate;
1987 }
1988 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
1989
1990 void omap_set_lcd_dma_b1_mirror(int mirror)
1991 {
1992         if (omap_dma_in_1510_mode()) {
1993                 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
1994                 BUG();
1995         }
1996         lcd_dma.mirror = mirror;
1997 }
1998 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
1999
2000 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
2001 {
2002         if (omap_dma_in_1510_mode()) {
2003                 printk(KERN_ERR "DMA virtual resulotion is not supported "
2004                                 "in 1510 mode\n");
2005                 BUG();
2006         }
2007         lcd_dma.vxres = vxres;
2008 }
2009 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
2010
2011 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
2012 {
2013         if (omap_dma_in_1510_mode()) {
2014                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
2015                 BUG();
2016         }
2017         lcd_dma.xscale = xscale;
2018         lcd_dma.yscale = yscale;
2019 }
2020 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
2021
2022 static void set_b1_regs(void)
2023 {
2024         unsigned long top, bottom;
2025         int es;
2026         u16 w;
2027         unsigned long en, fn;
2028         long ei, fi;
2029         unsigned long vxres;
2030         unsigned int xscale, yscale;
2031
2032         switch (lcd_dma.data_type) {
2033         case OMAP_DMA_DATA_TYPE_S8:
2034                 es = 1;
2035                 break;
2036         case OMAP_DMA_DATA_TYPE_S16:
2037                 es = 2;
2038                 break;
2039         case OMAP_DMA_DATA_TYPE_S32:
2040                 es = 4;
2041                 break;
2042         default:
2043                 BUG();
2044                 return;
2045         }
2046
2047         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
2048         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
2049         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
2050         BUG_ON(vxres < lcd_dma.xres);
2051
2052 #define PIXADDR(x, y) (lcd_dma.addr +                                   \
2053                 ((y) * vxres * yscale + (x) * xscale) * es)
2054 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
2055
2056         switch (lcd_dma.rotate) {
2057         case 0:
2058                 if (!lcd_dma.mirror) {
2059                         top = PIXADDR(0, 0);
2060                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2061                         /* 1510 DMA requires the bottom address to be 2 more
2062                          * than the actual last memory access location. */
2063                         if (omap_dma_in_1510_mode() &&
2064                                 lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
2065                                         bottom += 2;
2066                         ei = PIXSTEP(0, 0, 1, 0);
2067                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
2068                 } else {
2069                         top = PIXADDR(lcd_dma.xres - 1, 0);
2070                         bottom = PIXADDR(0, lcd_dma.yres - 1);
2071                         ei = PIXSTEP(1, 0, 0, 0);
2072                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
2073                 }
2074                 en = lcd_dma.xres;
2075                 fn = lcd_dma.yres;
2076                 break;
2077         case 90:
2078                 if (!lcd_dma.mirror) {
2079                         top = PIXADDR(0, lcd_dma.yres - 1);
2080                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
2081                         ei = PIXSTEP(0, 1, 0, 0);
2082                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
2083                 } else {
2084                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2085                         bottom = PIXADDR(0, 0);
2086                         ei = PIXSTEP(0, 1, 0, 0);
2087                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
2088                 }
2089                 en = lcd_dma.yres;
2090                 fn = lcd_dma.xres;
2091                 break;
2092         case 180:
2093                 if (!lcd_dma.mirror) {
2094                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2095                         bottom = PIXADDR(0, 0);
2096                         ei = PIXSTEP(1, 0, 0, 0);
2097                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
2098                 } else {
2099                         top = PIXADDR(0, lcd_dma.yres - 1);
2100                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
2101                         ei = PIXSTEP(0, 0, 1, 0);
2102                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
2103                 }
2104                 en = lcd_dma.xres;
2105                 fn = lcd_dma.yres;
2106                 break;
2107         case 270:
2108                 if (!lcd_dma.mirror) {
2109                         top = PIXADDR(lcd_dma.xres - 1, 0);
2110                         bottom = PIXADDR(0, lcd_dma.yres - 1);
2111                         ei = PIXSTEP(0, 0, 0, 1);
2112                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
2113                 } else {
2114                         top = PIXADDR(0, 0);
2115                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
2116                         ei = PIXSTEP(0, 0, 0, 1);
2117                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
2118                 }
2119                 en = lcd_dma.yres;
2120                 fn = lcd_dma.xres;
2121                 break;
2122         default:
2123                 BUG();
2124                 return; /* Suppress warning about uninitialized vars */
2125         }
2126
2127         if (omap_dma_in_1510_mode()) {
2128                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
2129                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
2130                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
2131                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
2132
2133                 return;
2134         }
2135
2136         /* 1610 regs */
2137         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
2138         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
2139         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
2140         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
2141
2142         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
2143         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
2144
2145         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
2146         w &= ~0x03;
2147         w |= lcd_dma.data_type;
2148         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
2149
2150         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2151         /* Always set the source port as SDRAM for now*/
2152         w &= ~(0x03 << 6);
2153         if (lcd_dma.callback != NULL)
2154                 w |= 1 << 1;            /* Block interrupt enable */
2155         else
2156                 w &= ~(1 << 1);
2157         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2158
2159         if (!(lcd_dma.rotate || lcd_dma.mirror ||
2160               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
2161                 return;
2162
2163         w = omap_readw(OMAP1610_DMA_LCD_CCR);
2164         /* Set the double-indexed addressing mode */
2165         w |= (0x03 << 12);
2166         omap_writew(w, OMAP1610_DMA_LCD_CCR);
2167
2168         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
2169         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
2170         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
2171 }
2172
2173 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id)
2174 {
2175         u16 w;
2176
2177         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2178         if (unlikely(!(w & (1 << 3)))) {
2179                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
2180                 return IRQ_NONE;
2181         }
2182         /* Ack the IRQ */
2183         w |= (1 << 3);
2184         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2185         lcd_dma.active = 0;
2186         if (lcd_dma.callback != NULL)
2187                 lcd_dma.callback(w, lcd_dma.cb_data);
2188
2189         return IRQ_HANDLED;
2190 }
2191
2192 int omap_request_lcd_dma(void (*callback)(u16 status, void *data),
2193                          void *data)
2194 {
2195         spin_lock_irq(&lcd_dma.lock);
2196         if (lcd_dma.reserved) {
2197                 spin_unlock_irq(&lcd_dma.lock);
2198                 printk(KERN_ERR "LCD DMA channel already reserved\n");
2199                 BUG();
2200                 return -EBUSY;
2201         }
2202         lcd_dma.reserved = 1;
2203         spin_unlock_irq(&lcd_dma.lock);
2204         lcd_dma.callback = callback;
2205         lcd_dma.cb_data = data;
2206         lcd_dma.active = 0;
2207         lcd_dma.single_transfer = 0;
2208         lcd_dma.rotate = 0;
2209         lcd_dma.vxres = 0;
2210         lcd_dma.mirror = 0;
2211         lcd_dma.xscale = 0;
2212         lcd_dma.yscale = 0;
2213         lcd_dma.ext_ctrl = 0;
2214         lcd_dma.src_port = 0;
2215
2216         return 0;
2217 }
2218 EXPORT_SYMBOL(omap_request_lcd_dma);
2219
2220 void omap_free_lcd_dma(void)
2221 {
2222         spin_lock(&lcd_dma.lock);
2223         if (!lcd_dma.reserved) {
2224                 spin_unlock(&lcd_dma.lock);
2225                 printk(KERN_ERR "LCD DMA is not reserved\n");
2226                 BUG();
2227                 return;
2228         }
2229         if (!enable_1510_mode)
2230                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
2231                             OMAP1610_DMA_LCD_CCR);
2232         lcd_dma.reserved = 0;
2233         spin_unlock(&lcd_dma.lock);
2234 }
2235 EXPORT_SYMBOL(omap_free_lcd_dma);
2236
2237 void omap_enable_lcd_dma(void)
2238 {
2239         u16 w;
2240
2241         /*
2242          * Set the Enable bit only if an external controller is
2243          * connected. Otherwise the OMAP internal controller will
2244          * start the transfer when it gets enabled.
2245          */
2246         if (enable_1510_mode || !lcd_dma.ext_ctrl)
2247                 return;
2248
2249         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2250         w |= 1 << 8;
2251         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2252
2253         lcd_dma.active = 1;
2254
2255         w = omap_readw(OMAP1610_DMA_LCD_CCR);
2256         w |= 1 << 7;
2257         omap_writew(w, OMAP1610_DMA_LCD_CCR);
2258 }
2259 EXPORT_SYMBOL(omap_enable_lcd_dma);
2260
2261 void omap_setup_lcd_dma(void)
2262 {
2263         BUG_ON(lcd_dma.active);
2264         if (!enable_1510_mode) {
2265                 /* Set some reasonable defaults */
2266                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
2267                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
2268                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
2269         }
2270         set_b1_regs();
2271         if (!enable_1510_mode) {
2272                 u16 w;
2273
2274                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
2275                 /*
2276                  * If DMA was already active set the end_prog bit to have
2277                  * the programmed register set loaded into the active
2278                  * register set.
2279                  */
2280                 w |= 1 << 11;           /* End_prog */
2281                 if (!lcd_dma.single_transfer)
2282                         w |= (3 << 8);  /* Auto_init, repeat */
2283                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
2284         }
2285 }
2286 EXPORT_SYMBOL(omap_setup_lcd_dma);
2287
2288 void omap_stop_lcd_dma(void)
2289 {
2290         u16 w;
2291
2292         lcd_dma.active = 0;
2293         if (enable_1510_mode || !lcd_dma.ext_ctrl)
2294                 return;
2295
2296         w = omap_readw(OMAP1610_DMA_LCD_CCR);
2297         w &= ~(1 << 7);
2298         omap_writew(w, OMAP1610_DMA_LCD_CCR);
2299
2300         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2301         w &= ~(1 << 8);
2302         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2303 }
2304 EXPORT_SYMBOL(omap_stop_lcd_dma);
2305
2306 /*----------------------------------------------------------------------------*/
2307
2308 static int __init omap_init_dma(void)
2309 {
2310         int ch, r;
2311
2312         if (cpu_class_is_omap1()) {
2313                 omap_dma_base = IO_ADDRESS(OMAP1_DMA_BASE);
2314                 dma_lch_count = OMAP1_LOGICAL_DMA_CH_COUNT;
2315         } else if (cpu_is_omap24xx()) {
2316                 omap_dma_base = IO_ADDRESS(OMAP24XX_DMA4_BASE);
2317                 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2318         } else if (cpu_is_omap34xx()) {
2319                 omap_dma_base = IO_ADDRESS(OMAP34XX_DMA4_BASE);
2320                 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2321         } else {
2322                 pr_err("DMA init failed for unsupported omap\n");
2323                 return -ENODEV;
2324         }
2325
2326         if (cpu_class_is_omap2() && omap_dma_reserve_channels
2327                         && (omap_dma_reserve_channels <= dma_lch_count))
2328                 dma_lch_count = omap_dma_reserve_channels;
2329
2330         dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
2331                                 GFP_KERNEL);
2332         if (!dma_chan)
2333                 return -ENOMEM;
2334
2335         if (cpu_class_is_omap2()) {
2336                 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2337                                                 dma_lch_count, GFP_KERNEL);
2338                 if (!dma_linked_lch) {
2339                         kfree(dma_chan);
2340                         return -ENOMEM;
2341                 }
2342         }
2343
2344         if (cpu_is_omap15xx()) {
2345                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
2346                 dma_chan_count = 9;
2347                 enable_1510_mode = 1;
2348         } else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
2349                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
2350                        dma_read(HW_ID));
2351                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
2352                        (dma_read(CAPS_0_U) << 16) |
2353                        dma_read(CAPS_0_L),
2354                        (dma_read(CAPS_1_U) << 16) |
2355                        dma_read(CAPS_1_L),
2356                        dma_read(CAPS_2), dma_read(CAPS_3),
2357                        dma_read(CAPS_4));
2358                 if (!enable_1510_mode) {
2359                         u16 w;
2360
2361                         /* Disable OMAP 3.0/3.1 compatibility mode. */
2362                         w = dma_read(GSCR);
2363                         w |= 1 << 3;
2364                         dma_write(w, GSCR);
2365                         dma_chan_count = 16;
2366                 } else
2367                         dma_chan_count = 9;
2368                 if (cpu_is_omap16xx()) {
2369                         u16 w;
2370
2371                         /* this would prevent OMAP sleep */
2372                         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2373                         w &= ~(1 << 8);
2374                         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2375                 }
2376         } else if (cpu_class_is_omap2()) {
2377                 u8 revision = dma_read(REVISION) & 0xff;
2378                 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
2379                        revision >> 4, revision & 0xf);
2380                 dma_chan_count = dma_lch_count;
2381         } else {
2382                 dma_chan_count = 0;
2383                 return 0;
2384         }
2385
2386         spin_lock_init(&lcd_dma.lock);
2387         spin_lock_init(&dma_chan_lock);
2388
2389         for (ch = 0; ch < dma_chan_count; ch++) {
2390                 omap_clear_dma(ch);
2391                 dma_chan[ch].dev_id = -1;
2392                 dma_chan[ch].next_lch = -1;
2393
2394                 if (ch >= 6 && enable_1510_mode)
2395                         continue;
2396
2397                 if (cpu_class_is_omap1()) {
2398                         /*
2399                          * request_irq() doesn't like dev_id (ie. ch) being
2400                          * zero, so we have to kludge around this.
2401                          */
2402                         r = request_irq(omap1_dma_irq[ch],
2403                                         omap1_dma_irq_handler, 0, "DMA",
2404                                         (void *) (ch + 1));
2405                         if (r != 0) {
2406                                 int i;
2407
2408                                 printk(KERN_ERR "unable to request IRQ %d "
2409                                        "for DMA (error %d)\n",
2410                                        omap1_dma_irq[ch], r);
2411                                 for (i = 0; i < ch; i++)
2412                                         free_irq(omap1_dma_irq[i],
2413                                                  (void *) (i + 1));
2414                                 return r;
2415                         }
2416                 }
2417         }
2418
2419         if (cpu_is_omap2430() || cpu_is_omap34xx())
2420                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2421                                 DMA_DEFAULT_FIFO_DEPTH, 0);
2422
2423         if (cpu_class_is_omap2())
2424                 setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);
2425
2426         /* FIXME: Update LCD DMA to work on 24xx */
2427         if (cpu_class_is_omap1()) {
2428                 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
2429                                 "LCD DMA", NULL);
2430                 if (r != 0) {
2431                         int i;
2432
2433                         printk(KERN_ERR "unable to request IRQ for LCD DMA "
2434                                "(error %d)\n", r);
2435                         for (i = 0; i < dma_chan_count; i++)
2436                                 free_irq(omap1_dma_irq[i], (void *) (i + 1));
2437                         return r;
2438                 }
2439         }
2440
2441         return 0;
2442 }
2443
2444 arch_initcall(omap_init_dma);
2445
2446 /*
2447  * Reserve the omap SDMA channels using cmdline bootarg
2448  * "omap_dma_reserve_ch=". The valid range is 1 to 32
2449  */
2450 static int __init omap_dma_cmdline_reserve_ch(char *str)
2451 {
2452         if (get_option(&str, &omap_dma_reserve_channels) != 1)
2453                 omap_dma_reserve_channels = 0;
2454         return 1;
2455 }
2456
2457 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
2458
2459