git.oblomov.eu Git - linux-2.6/blob - 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
 127 static spinlock_t dma_chan_lock;
 128 static struct omap_dma_lch *dma_chan;
 129 static void __iomem *omap_dma_base;
 130
 131 static const u8 omap1_dma_irq[OMAP1_LOGICAL_DMA_CH_COUNT] = {
 132         INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
 133         INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
 134         INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
 135         INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
 136         INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
 137 };
 138
 139 static inline void disable_lnk(int lch);
 140 static void omap_disable_channel_irq(int lch);
 141 static inline void omap_enable_channel_irq(int lch);
 142
 143 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 144                                                 __func__);
 145
 146 #define dma_read(reg)                                                   \
 147 ({                                                                      \
 148         u32 __val;                                                      \
 149         if (cpu_class_is_omap1())                                       \
 150                 __val = __raw_readw(omap_dma_base + OMAP1_DMA_##reg);   \
 151         else                                                            \
 152                 __val = __raw_readl(omap_dma_base + OMAP_DMA4_##reg);   \
 153         __val;                                                          \
 154 })
 155
 156 #define dma_write(val, reg)                                             \
 157 ({                                                                      \
 158         if (cpu_class_is_omap1())                                       \
 159                 __raw_writew((u16)(val), omap_dma_base + OMAP1_DMA_##reg); \
 160         else                                                            \
 161                 __raw_writel((val), omap_dma_base + OMAP_DMA4_##reg);   \
 162 })
 163
 164 #ifdef CONFIG_ARCH_OMAP15XX
 165 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 166 int omap_dma_in_1510_mode(void)
 167 {
 168         return enable_1510_mode;
 169 }
 170 #else
 171 #define omap_dma_in_1510_mode()         0
 172 #endif
 173
 174 #ifdef CONFIG_ARCH_OMAP1
 175 static inline int get_gdma_dev(int req)
 176 {
 177         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 178         int shift = ((req - 1) % 5) * 6;
 179
 180         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
 181 }
 182
 183 static inline void set_gdma_dev(int req, int dev)
 184 {
 185         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 186         int shift = ((req - 1) % 5) * 6;
 187         u32 l;
 188
 189         l = omap_readl(reg);
 190         l &= ~(0x3f << shift);
 191         l |= (dev - 1) << shift;
 192         omap_writel(l, reg);
 193 }
 194 #else
 195 #define set_gdma_dev(req, dev)  do {} while (0)
 196 #endif
 197
 198 /* Omap1 only */
 199 static void clear_lch_regs(int lch)
 200 {
 201         int i;
 202         void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch);
 203
 204         for (i = 0; i < 0x2c; i += 2)
 205                 __raw_writew(0, lch_base + i);
 206 }
 207
 208 void omap_set_dma_priority(int lch, int dst_port, int priority)
 209 {
 210         unsigned long reg;
 211         u32 l;
 212
 213         if (cpu_class_is_omap1()) {
 214                 switch (dst_port) {
 215                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 216                         reg = OMAP_TC_OCPT1_PRIOR;
 217                         break;
 218                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 219                         reg = OMAP_TC_OCPT2_PRIOR;
 220                         break;
 221                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 222                         reg = OMAP_TC_EMIFF_PRIOR;
 223                         break;
 224                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 225                         reg = OMAP_TC_EMIFS_PRIOR;
 226                         break;
 227                 default:
 228                         BUG();
 229                         return;
 230                 }
 231                 l = omap_readl(reg);
 232                 l &= ~(0xf << 8);
 233                 l |= (priority & 0xf) << 8;
 234                 omap_writel(l, reg);
 235         }
 236
 237         if (cpu_class_is_omap2()) {
 238                 u32 ccr;
 239
 240                 ccr = dma_read(CCR(lch));
 241                 if (priority)
 242                         ccr |= (1 << 6);
 243                 else
 244                         ccr &= ~(1 << 6);
 245                 dma_write(ccr, CCR(lch));
 246         }
 247 }
 248 EXPORT_SYMBOL(omap_set_dma_priority);
 249
 250 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 251                                   int frame_count, int sync_mode,
 252                                   int dma_trigger, int src_or_dst_synch)
 253 {
 254         u32 l;
 255
 256         l = dma_read(CSDP(lch));
 257         l &= ~0x03;
 258         l |= data_type;
 259         dma_write(l, CSDP(lch));
 260
 261         if (cpu_class_is_omap1()) {
 262                 u16 ccr;
 263
 264                 ccr = dma_read(CCR(lch));
 265                 ccr &= ~(1 << 5);
 266                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 267                         ccr |= 1 << 5;
 268                 dma_write(ccr, CCR(lch));
 269
 270                 ccr = dma_read(CCR2(lch));
 271                 ccr &= ~(1 << 2);
 272                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 273                         ccr |= 1 << 2;
 274                 dma_write(ccr, CCR2(lch));
 275         }
 276
 277         if (cpu_class_is_omap2() && dma_trigger) {
 278                 u32 val;
 279
 280                 val = dma_read(CCR(lch));
 281                 val &= ~(3 << 19);
 282                 if (dma_trigger > 63)
 283                         val |= 1 << 20;
 284                 if (dma_trigger > 31)
 285                         val |= 1 << 19;
 286
 287                 val &= ~(0x1f);
 288                 val |= (dma_trigger & 0x1f);
 289
 290                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 291                         val |= 1 << 5;
 292                 else
 293                         val &= ~(1 << 5);
 294
 295                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 296                         val |= 1 << 18;
 297                 else
 298                         val &= ~(1 << 18);
 299
 300                 if (src_or_dst_synch)
 301                         val |= 1 << 24;         /* source synch */
 302                 else
 303                         val &= ~(1 << 24);      /* dest synch */
 304
 305                 dma_write(val, CCR(lch));
 306         }
 307
 308         dma_write(elem_count, CEN(lch));
 309         dma_write(frame_count, CFN(lch));
 310 }
 311 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 312
 313 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 314 {
 315         u16 w;
 316
 317         BUG_ON(omap_dma_in_1510_mode());
 318
 319         if (cpu_class_is_omap2()) {
 320                 REVISIT_24XX();
 321                 return;
 322         }
 323
 324         w = dma_read(CCR2(lch));
 325         w &= ~0x03;
 326
 327         switch (mode) {
 328         case OMAP_DMA_CONSTANT_FILL:
 329                 w |= 0x01;
 330                 break;
 331         case OMAP_DMA_TRANSPARENT_COPY:
 332                 w |= 0x02;
 333                 break;
 334         case OMAP_DMA_COLOR_DIS:
 335                 break;
 336         default:
 337                 BUG();
 338         }
 339         dma_write(w, CCR2(lch));
 340
 341         w = dma_read(LCH_CTRL(lch));
 342         w &= ~0x0f;
 343         /* Default is channel type 2D */
 344         if (mode) {
 345                 dma_write((u16)color, COLOR_L(lch));
 346                 dma_write((u16)(color >> 16), COLOR_U(lch));
 347                 w |= 1;         /* Channel type G */
 348         }
 349         dma_write(w, LCH_CTRL(lch));
 350 }
 351 EXPORT_SYMBOL(omap_set_dma_color_mode);
 352
 353 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 354 {
 355         if (cpu_class_is_omap2()) {
 356                 u32 csdp;
 357
 358                 csdp = dma_read(CSDP(lch));
 359                 csdp &= ~(0x3 << 16);
 360                 csdp |= (mode << 16);
 361                 dma_write(csdp, CSDP(lch));
 362         }
 363 }
 364 EXPORT_SYMBOL(omap_set_dma_write_mode);
 365
 366 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 367 {
 368         if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
 369                 u32 l;
 370
 371                 l = dma_read(LCH_CTRL(lch));
 372                 l &= ~0x7;
 373                 l |= mode;
 374                 dma_write(l, LCH_CTRL(lch));
 375         }
 376 }
 377 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 378
 379 /* Note that src_port is only for omap1 */
 380 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 381                              unsigned long src_start,
 382                              int src_ei, int src_fi)
 383 {
 384         u32 l;
 385
 386         if (cpu_class_is_omap1()) {
 387                 u16 w;
 388
 389                 w = dma_read(CSDP(lch));
 390                 w &= ~(0x1f << 2);
 391                 w |= src_port << 2;
 392                 dma_write(w, CSDP(lch));
 393         }
 394
 395         l = dma_read(CCR(lch));
 396         l &= ~(0x03 << 12);
 397         l |= src_amode << 12;
 398         dma_write(l, CCR(lch));
 399
 400         if (cpu_class_is_omap1()) {
 401                 dma_write(src_start >> 16, CSSA_U(lch));
 402                 dma_write((u16)src_start, CSSA_L(lch));
 403         }
 404
 405         if (cpu_class_is_omap2())
 406                 dma_write(src_start, CSSA(lch));
 407
 408         dma_write(src_ei, CSEI(lch));
 409         dma_write(src_fi, CSFI(lch));
 410 }
 411 EXPORT_SYMBOL(omap_set_dma_src_params);
 412
 413 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 414 {
 415         omap_set_dma_transfer_params(lch, params->data_type,
 416                                      params->elem_count, params->frame_count,
 417                                      params->sync_mode, params->trigger,
 418                                      params->src_or_dst_synch);
 419         omap_set_dma_src_params(lch, params->src_port,
 420                                 params->src_amode, params->src_start,
 421                                 params->src_ei, params->src_fi);
 422
 423         omap_set_dma_dest_params(lch, params->dst_port,
 424                                  params->dst_amode, params->dst_start,
 425                                  params->dst_ei, params->dst_fi);
 426         if (params->read_prio || params->write_prio)
 427                 omap_dma_set_prio_lch(lch, params->read_prio,
 428                                       params->write_prio);
 429 }
 430 EXPORT_SYMBOL(omap_set_dma_params);
 431
 432 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 433 {
 434         if (cpu_class_is_omap2())
 435                 return;
 436
 437         dma_write(eidx, CSEI(lch));
 438         dma_write(fidx, CSFI(lch));
 439 }
 440 EXPORT_SYMBOL(omap_set_dma_src_index);
 441
 442 void omap_set_dma_src_data_pack(int lch, int enable)
 443 {
 444         u32 l;
 445
 446         l = dma_read(CSDP(lch));
 447         l &= ~(1 << 6);
 448         if (enable)
 449                 l |= (1 << 6);
 450         dma_write(l, CSDP(lch));
 451 }
 452 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 453
 454 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 455 {
 456         unsigned int burst = 0;
 457         u32 l;
 458
 459         l = dma_read(CSDP(lch));
 460         l &= ~(0x03 << 7);
 461
 462         switch (burst_mode) {
 463         case OMAP_DMA_DATA_BURST_DIS:
 464                 break;
 465         case OMAP_DMA_DATA_BURST_4:
 466                 if (cpu_class_is_omap2())
 467                         burst = 0x1;
 468                 else
 469                         burst = 0x2;
 470                 break;
 471         case OMAP_DMA_DATA_BURST_8:
 472                 if (cpu_class_is_omap2()) {
 473                         burst = 0x2;
 474                         break;
 475                 }
 476                 /* not supported by current hardware on OMAP1
 477                  * w |= (0x03 << 7);
 478                  * fall through
 479                  */
 480         case OMAP_DMA_DATA_BURST_16:
 481                 if (cpu_class_is_omap2()) {
 482                         burst = 0x3;
 483                         break;
 484                 }
 485                 /* OMAP1 don't support burst 16
 486                  * fall through
 487                  */
 488         default:
 489                 BUG();
 490         }
 491
 492         l |= (burst << 7);
 493         dma_write(l, CSDP(lch));
 494 }
 495 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 496
 497 /* Note that dest_port is only for OMAP1 */
 498 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 499                               unsigned long dest_start,
 500                               int dst_ei, int dst_fi)
 501 {
 502         u32 l;
 503
 504         if (cpu_class_is_omap1()) {
 505                 l = dma_read(CSDP(lch));
 506                 l &= ~(0x1f << 9);
 507                 l |= dest_port << 9;
 508                 dma_write(l, CSDP(lch));
 509         }
 510
 511         l = dma_read(CCR(lch));
 512         l &= ~(0x03 << 14);
 513         l |= dest_amode << 14;
 514         dma_write(l, CCR(lch));
 515
 516         if (cpu_class_is_omap1()) {
 517                 dma_write(dest_start >> 16, CDSA_U(lch));
 518                 dma_write(dest_start, CDSA_L(lch));
 519         }
 520
 521         if (cpu_class_is_omap2())
 522                 dma_write(dest_start, CDSA(lch));
 523
 524         dma_write(dst_ei, CDEI(lch));
 525         dma_write(dst_fi, CDFI(lch));
 526 }
 527 EXPORT_SYMBOL(omap_set_dma_dest_params);
 528
 529 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 530 {
 531         if (cpu_class_is_omap2())
 532                 return;
 533
 534         dma_write(eidx, CDEI(lch));
 535         dma_write(fidx, CDFI(lch));
 536 }
 537 EXPORT_SYMBOL(omap_set_dma_dest_index);
 538
 539 void omap_set_dma_dest_data_pack(int lch, int enable)
 540 {
 541         u32 l;
 542
 543         l = dma_read(CSDP(lch));
 544         l &= ~(1 << 13);
 545         if (enable)
 546                 l |= 1 << 13;
 547         dma_write(l, CSDP(lch));
 548 }
 549 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 550
 551 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 552 {
 553         unsigned int burst = 0;
 554         u32 l;
 555
 556         l = dma_read(CSDP(lch));
 557         l &= ~(0x03 << 14);
 558
 559         switch (burst_mode) {
 560         case OMAP_DMA_DATA_BURST_DIS:
 561                 break;
 562         case OMAP_DMA_DATA_BURST_4:
 563                 if (cpu_class_is_omap2())
 564                         burst = 0x1;
 565                 else
 566                         burst = 0x2;
 567                 break;
 568         case OMAP_DMA_DATA_BURST_8:
 569                 if (cpu_class_is_omap2())
 570                         burst = 0x2;
 571                 else
 572                         burst = 0x3;
 573                 break;
 574         case OMAP_DMA_DATA_BURST_16:
 575                 if (cpu_class_is_omap2()) {
 576                         burst = 0x3;
 577                         break;
 578                 }
 579                 /* OMAP1 don't support burst 16
 580                  * fall through
 581                  */
 582         default:
 583                 printk(KERN_ERR "Invalid DMA burst mode\n");
 584                 BUG();
 585                 return;
 586         }
 587         l |= (burst << 14);
 588         dma_write(l, CSDP(lch));
 589 }
 590 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 591
 592 static inline void omap_enable_channel_irq(int lch)
 593 {
 594         u32 status;
 595
 596         /* Clear CSR */
 597         if (cpu_class_is_omap1())
 598                 status = dma_read(CSR(lch));
 599         else if (cpu_class_is_omap2())
 600                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
 601
 602         /* Enable some nice interrupts. */
 603         dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
 604 }
 605
 606 static void omap_disable_channel_irq(int lch)
 607 {
 608         if (cpu_class_is_omap2())
 609                 dma_write(0, CICR(lch));
 610 }
 611
 612 void omap_enable_dma_irq(int lch, u16 bits)
 613 {
 614         dma_chan[lch].enabled_irqs |= bits;
 615 }
 616 EXPORT_SYMBOL(omap_enable_dma_irq);
 617
 618 void omap_disable_dma_irq(int lch, u16 bits)
 619 {
 620         dma_chan[lch].enabled_irqs &= ~bits;
 621 }
 622 EXPORT_SYMBOL(omap_disable_dma_irq);
 623
 624 static inline void enable_lnk(int lch)
 625 {
 626         u32 l;
 627
 628         l = dma_read(CLNK_CTRL(lch));
 629
 630         if (cpu_class_is_omap1())
 631                 l &= ~(1 << 14);
 632
 633         /* Set the ENABLE_LNK bits */
 634         if (dma_chan[lch].next_lch != -1)
 635                 l = dma_chan[lch].next_lch | (1 << 15);
 636
 637 #ifndef CONFIG_ARCH_OMAP1
 638         if (cpu_class_is_omap2())
 639                 if (dma_chan[lch].next_linked_ch != -1)
 640                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 641 #endif
 642
 643         dma_write(l, CLNK_CTRL(lch));
 644 }
 645
 646 static inline void disable_lnk(int lch)
 647 {
 648         u32 l;
 649
 650         l = dma_read(CLNK_CTRL(lch));
 651
 652         /* Disable interrupts */
 653         if (cpu_class_is_omap1()) {
 654                 dma_write(0, CICR(lch));
 655                 /* Set the STOP_LNK bit */
 656                 l |= 1 << 14;
 657         }
 658
 659         if (cpu_class_is_omap2()) {
 660                 omap_disable_channel_irq(lch);
 661                 /* Clear the ENABLE_LNK bit */
 662                 l &= ~(1 << 15);
 663         }
 664
 665         dma_write(l, CLNK_CTRL(lch));
 666         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 667 }
 668
 669 static inline void omap2_enable_irq_lch(int lch)
 670 {
 671         u32 val;
 672
 673         if (!cpu_class_is_omap2())
 674                 return;
 675
 676         val = dma_read(IRQENABLE_L0);
 677         val |= 1 << lch;
 678         dma_write(val, IRQENABLE_L0);
 679 }
 680
 681 int omap_request_dma(int dev_id, const char *dev_name,
 682                      void (*callback)(int lch, u16 ch_status, void *data),
 683                      void *data, int *dma_ch_out)
 684 {
 685         int ch, free_ch = -1;
 686         unsigned long flags;
 687         struct omap_dma_lch *chan;
 688
 689         spin_lock_irqsave(&dma_chan_lock, flags);
 690         for (ch = 0; ch < dma_chan_count; ch++) {
 691                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 692                         free_ch = ch;
 693                         if (dev_id == 0)
 694                                 break;
 695                 }
 696         }
 697         if (free_ch == -1) {
 698                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 699                 return -EBUSY;
 700         }
 701         chan = dma_chan + free_ch;
 702         chan->dev_id = dev_id;
 703
 704         if (cpu_class_is_omap1())
 705                 clear_lch_regs(free_ch);
 706
 707         if (cpu_class_is_omap2())
 708                 omap_clear_dma(free_ch);
 709
 710         spin_unlock_irqrestore(&dma_chan_lock, flags);
 711
 712         chan->dev_name = dev_name;
 713         chan->callback = callback;
 714         chan->data = data;
 715
 716 #ifndef CONFIG_ARCH_OMAP1
 717         if (cpu_class_is_omap2()) {
 718                 chan->chain_id = -1;
 719                 chan->next_linked_ch = -1;
 720         }
 721 #endif
 722
 723         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 724
 725         if (cpu_class_is_omap1())
 726                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 727         else if (cpu_class_is_omap2())
 728                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 729                         OMAP2_DMA_TRANS_ERR_IRQ;
 730
 731         if (cpu_is_omap16xx()) {
 732                 /* If the sync device is set, configure it dynamically. */
 733                 if (dev_id != 0) {
 734                         set_gdma_dev(free_ch + 1, dev_id);
 735                         dev_id = free_ch + 1;
 736                 }
 737                 /*
 738                  * Disable the 1510 compatibility mode and set the sync device
 739                  * id.
 740                  */
 741                 dma_write(dev_id | (1 << 10), CCR(free_ch));
 742         } else if (cpu_is_omap730() || cpu_is_omap15xx()) {
 743                 dma_write(dev_id, CCR(free_ch));
 744         }
 745
 746         if (cpu_class_is_omap2()) {
 747                 omap2_enable_irq_lch(free_ch);
 748                 omap_enable_channel_irq(free_ch);
 749                 /* Clear the CSR register and IRQ status register */
 750                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
 751                 dma_write(1 << free_ch, IRQSTATUS_L0);
 752         }
 753
 754         *dma_ch_out = free_ch;
 755
 756         return 0;
 757 }
 758 EXPORT_SYMBOL(omap_request_dma);
 759
 760 void omap_free_dma(int lch)
 761 {
 762         unsigned long flags;
 763
 764         spin_lock_irqsave(&dma_chan_lock, flags);
 765         if (dma_chan[lch].dev_id == -1) {
 766                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 767                        lch);
 768                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 769                 return;
 770         }
 771
 772         dma_chan[lch].dev_id = -1;
 773         dma_chan[lch].next_lch = -1;
 774         dma_chan[lch].callback = NULL;
 775         spin_unlock_irqrestore(&dma_chan_lock, flags);
 776
 777         if (cpu_class_is_omap1()) {
 778                 /* Disable all DMA interrupts for the channel. */
 779                 dma_write(0, CICR(lch));
 780                 /* Make sure the DMA transfer is stopped. */
 781                 dma_write(0, CCR(lch));
 782         }
 783
 784         if (cpu_class_is_omap2()) {
 785                 u32 val;
 786                 /* Disable interrupts */
 787                 val = dma_read(IRQENABLE_L0);
 788                 val &= ~(1 << lch);
 789                 dma_write(val, IRQENABLE_L0);
 790
 791                 /* Clear the CSR register and IRQ status register */
 792                 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
 793                 dma_write(1 << lch, IRQSTATUS_L0);
 794
 795                 /* Disable all DMA interrupts for the channel. */
 796                 dma_write(0, CICR(lch));
 797
 798                 /* Make sure the DMA transfer is stopped. */
 799                 dma_write(0, CCR(lch));
 800                 omap_clear_dma(lch);
 801         }
 802 }
 803 EXPORT_SYMBOL(omap_free_dma);
 804
 805 /**
 806  * @brief omap_dma_set_global_params : Set global priority settings for dma
 807  *
 808  * @param arb_rate
 809  * @param max_fifo_depth
 810  * @param tparams - Number of thereads to reserve : DMA_THREAD_RESERVE_NORM
 811  *                                                  DMA_THREAD_RESERVE_ONET
 812  *                                                  DMA_THREAD_RESERVE_TWOT
 813  *                                                  DMA_THREAD_RESERVE_THREET
 814  */
 815 void
 816 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 817 {
 818         u32 reg;
 819
 820         if (!cpu_class_is_omap2()) {
 821                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 822                 return;
 823         }
 824
 825         if (arb_rate == 0)
 826                 arb_rate = 1;
 827
 828         reg = (arb_rate & 0xff) << 16;
 829         reg |= (0xff & max_fifo_depth);
 830
 831         dma_write(reg, GCR);
 832 }
 833 EXPORT_SYMBOL(omap_dma_set_global_params);
 834
 835 /**
 836  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 837  *
 838  * @param lch
 839  * @param read_prio - Read priority
 840  * @param write_prio - Write priority
 841  * Both of the above can be set with one of the following values :
 842  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 843  */
 844 int
 845 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 846                       unsigned char write_prio)
 847 {
 848         u32 l;
 849
 850         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 851                 printk(KERN_ERR "Invalid channel id\n");
 852                 return -EINVAL;
 853         }
 854         l = dma_read(CCR(lch));
 855         l &= ~((1 << 6) | (1 << 26));
 856         if (cpu_is_omap2430() || cpu_is_omap34xx())
 857                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 858         else
 859                 l |= ((read_prio & 0x1) << 6);
 860
 861         dma_write(l, CCR(lch));
 862
 863         return 0;
 864 }
 865 EXPORT_SYMBOL(omap_dma_set_prio_lch);
 866
 867 /*
 868  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 869  * through omap_start_dma(). Any buffers in flight are discarded.
 870  */
 871 void omap_clear_dma(int lch)
 872 {
 873         unsigned long flags;
 874
 875         local_irq_save(flags);
 876
 877         if (cpu_class_is_omap1()) {
 878                 u32 l;
 879
 880                 l = dma_read(CCR(lch));
 881                 l &= ~OMAP_DMA_CCR_EN;
 882                 dma_write(l, CCR(lch));
 883
 884                 /* Clear pending interrupts */
 885                 l = dma_read(CSR(lch));
 886         }
 887
 888         if (cpu_class_is_omap2()) {
 889                 int i;
 890                 void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch);
 891                 for (i = 0; i < 0x44; i += 4)
 892                         __raw_writel(0, lch_base + i);
 893         }
 894
 895         local_irq_restore(flags);
 896 }
 897 EXPORT_SYMBOL(omap_clear_dma);
 898
 899 void omap_start_dma(int lch)
 900 {
 901         u32 l;
 902
 903         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 904                 int next_lch, cur_lch;
 905                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
 906
 907                 dma_chan_link_map[lch] = 1;
 908                 /* Set the link register of the first channel */
 909                 enable_lnk(lch);
 910
 911                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 912                 cur_lch = dma_chan[lch].next_lch;
 913                 do {
 914                         next_lch = dma_chan[cur_lch].next_lch;
 915
 916                         /* The loop case: we've been here already */
 917                         if (dma_chan_link_map[cur_lch])
 918                                 break;
 919                         /* Mark the current channel */
 920                         dma_chan_link_map[cur_lch] = 1;
 921
 922                         enable_lnk(cur_lch);
 923                         omap_enable_channel_irq(cur_lch);
 924
 925                         cur_lch = next_lch;
 926                 } while (next_lch != -1);
 927         } else if (cpu_class_is_omap2()) {
 928                 /* Errata: Need to write lch even if not using chaining */
 929                 dma_write(lch, CLNK_CTRL(lch));
 930         }
 931
 932         omap_enable_channel_irq(lch);
 933
 934         l = dma_read(CCR(lch));
 935
 936         /*
 937          * Errata: On ES2.0 BUFFERING disable must be set.
 938          * This will always fail on ES1.0
 939          */
 940         if (cpu_is_omap24xx())
 941                 l |= OMAP_DMA_CCR_EN;
 942
 943         l |= OMAP_DMA_CCR_EN;
 944         dma_write(l, CCR(lch));
 945
 946         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 947 }
 948 EXPORT_SYMBOL(omap_start_dma);
 949
 950 void omap_stop_dma(int lch)
 951 {
 952         u32 l;
 953
 954         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 955                 int next_lch, cur_lch = lch;
 956                 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
 957
 958                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 959                 do {
 960                         /* The loop case: we've been here already */
 961                         if (dma_chan_link_map[cur_lch])
 962                                 break;
 963                         /* Mark the current channel */
 964                         dma_chan_link_map[cur_lch] = 1;
 965
 966                         disable_lnk(cur_lch);
 967
 968                         next_lch = dma_chan[cur_lch].next_lch;
 969                         cur_lch = next_lch;
 970                 } while (next_lch != -1);
 971
 972                 return;
 973         }
 974
 975         /* Disable all interrupts on the channel */
 976         if (cpu_class_is_omap1())
 977                 dma_write(0, CICR(lch));
 978
 979         l = dma_read(CCR(lch));
 980         l &= ~OMAP_DMA_CCR_EN;
 981         dma_write(l, CCR(lch));
 982
 983         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 984 }
 985 EXPORT_SYMBOL(omap_stop_dma);
 986
 987 /*
 988  * Allows changing the DMA callback function or data. This may be needed if
 989  * the driver shares a single DMA channel for multiple dma triggers.
 990  */
 991 int omap_set_dma_callback(int lch,
 992                           void (*callback)(int lch, u16 ch_status, void *data),
 993                           void *data)
 994 {
 995         unsigned long flags;
 996
 997         if (lch < 0)
 998                 return -ENODEV;
 999
1000         spin_lock_irqsave(&dma_chan_lock, flags);
1001         if (dma_chan[lch].dev_id == -1) {
1002                 printk(KERN_ERR "DMA callback for not set for free channel\n");
1003                 spin_unlock_irqrestore(&dma_chan_lock, flags);
1004                 return -EINVAL;
1005         }
1006         dma_chan[lch].callback = callback;
1007         dma_chan[lch].data = data;
1008         spin_unlock_irqrestore(&dma_chan_lock, flags);
1009
1010         return 0;
1011 }
1012 EXPORT_SYMBOL(omap_set_dma_callback);
1013
1014 /*
1015  * Returns current physical source address for the given DMA channel.
1016  * If the channel is running the caller must disable interrupts prior calling
1017  * this function and process the returned value before re-enabling interrupt to
1018  * prevent races with the interrupt handler. Note that in continuous mode there
1019  * is a chance for CSSA_L register overflow inbetween the two reads resulting
1020  * in incorrect return value.
1021  */
1022 dma_addr_t omap_get_dma_src_pos(int lch)
1023 {
1024         dma_addr_t offset = 0;
1025
1026         if (cpu_is_omap15xx())
1027                 offset = dma_read(CPC(lch));
1028         else
1029                 offset = dma_read(CSAC(lch));
1030
1031         /*
1032          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1033          * read before the DMA controller finished disabling the channel.
1034          */
1035         if (!cpu_is_omap15xx() && offset == 0)
1036                 offset = dma_read(CSAC(lch));
1037
1038         if (cpu_class_is_omap1())
1039                 offset |= (dma_read(CSSA_U(lch)) << 16);
1040
1041         return offset;
1042 }
1043 EXPORT_SYMBOL(omap_get_dma_src_pos);
1044
1045 /*
1046  * Returns current physical destination address for the given DMA channel.
1047  * If the channel is running the caller must disable interrupts prior calling
1048  * this function and process the returned value before re-enabling interrupt to
1049  * prevent races with the interrupt handler. Note that in continuous mode there
1050  * is a chance for CDSA_L register overflow inbetween the two reads resulting
1051  * in incorrect return value.
1052  */
1053 dma_addr_t omap_get_dma_dst_pos(int lch)
1054 {
1055         dma_addr_t offset = 0;
1056
1057         if (cpu_is_omap15xx())
1058                 offset = dma_read(CPC(lch));
1059         else
1060                 offset = dma_read(CDAC(lch));
1061
1062         /*
1063          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1064          * read before the DMA controller finished disabling the channel.
1065          */
1066         if (!cpu_is_omap15xx() && offset == 0)
1067                 offset = dma_read(CDAC(lch));
1068
1069         if (cpu_class_is_omap1())
1070                 offset |= (dma_read(CDSA_U(lch)) << 16);
1071
1072         return offset;
1073 }
1074 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1075
1076 int omap_get_dma_active_status(int lch)
1077 {
1078         return (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN) != 0;
1079 }
1080 EXPORT_SYMBOL(omap_get_dma_active_status);
1081
1082 int omap_dma_running(void)
1083 {
1084         int lch;
1085
1086         /* Check if LCD DMA is running */
1087         if (cpu_is_omap16xx())
1088                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
1089                         return 1;
1090
1091         for (lch = 0; lch < dma_chan_count; lch++)
1092                 if (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN)
1093                         return 1;
1094
1095         return 0;
1096 }
1097
1098 /*
1099  * lch_queue DMA will start right after lch_head one is finished.
1100  * For this DMA link to start, you still need to start (see omap_start_dma)
1101  * the first one. That will fire up the entire queue.
1102  */
1103 void omap_dma_link_lch(int lch_head, int lch_queue)
1104 {
1105         if (omap_dma_in_1510_mode()) {
1106                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1107                 BUG();
1108                 return;
1109         }
1110
1111         if ((dma_chan[lch_head].dev_id == -1) ||
1112             (dma_chan[lch_queue].dev_id == -1)) {
1113                 printk(KERN_ERR "omap_dma: trying to link "
1114                        "non requested channels\n");
1115                 dump_stack();
1116         }
1117
1118         dma_chan[lch_head].next_lch = lch_queue;
1119 }
1120 EXPORT_SYMBOL(omap_dma_link_lch);
1121
1122 /*
1123  * Once the DMA queue is stopped, we can destroy it.
1124  */
1125 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1126 {
1127         if (omap_dma_in_1510_mode()) {
1128                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1129                 BUG();
1130                 return;
1131         }
1132
1133         if (dma_chan[lch_head].next_lch != lch_queue ||
1134             dma_chan[lch_head].next_lch == -1) {
1135                 printk(KERN_ERR "omap_dma: trying to unlink "
1136                        "non linked channels\n");
1137                 dump_stack();
1138         }
1139
1140         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1141             (dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
1142                 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1143                        "before unlinking\n");
1144                 dump_stack();
1145         }
1146
1147         dma_chan[lch_head].next_lch = -1;
1148 }
1149 EXPORT_SYMBOL(omap_dma_unlink_lch);
1150
1151 /*----------------------------------------------------------------------------*/
1152
1153 #ifndef CONFIG_ARCH_OMAP1
1154 /* Create chain of DMA channesls */
1155 static void create_dma_lch_chain(int lch_head, int lch_queue)
1156 {
1157         u32 l;
1158
1159         /* Check if this is the first link in chain */
1160         if (dma_chan[lch_head].next_linked_ch == -1) {
1161                 dma_chan[lch_head].next_linked_ch = lch_queue;
1162                 dma_chan[lch_head].prev_linked_ch = lch_queue;
1163                 dma_chan[lch_queue].next_linked_ch = lch_head;
1164                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1165         }
1166
1167         /* a link exists, link the new channel in circular chain */
1168         else {
1169                 dma_chan[lch_queue].next_linked_ch =
1170                                         dma_chan[lch_head].next_linked_ch;
1171                 dma_chan[lch_queue].prev_linked_ch = lch_head;
1172                 dma_chan[lch_head].next_linked_ch = lch_queue;
1173                 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1174                                         lch_queue;
1175         }
1176
1177         l = dma_read(CLNK_CTRL(lch_head));
1178         l &= ~(0x1f);
1179         l |= lch_queue;
1180         dma_write(l, CLNK_CTRL(lch_head));
1181
1182         l = dma_read(CLNK_CTRL(lch_queue));
1183         l &= ~(0x1f);
1184         l |= (dma_chan[lch_queue].next_linked_ch);
1185         dma_write(l, CLNK_CTRL(lch_queue));
1186 }
1187
1188 /**
1189  * @brief omap_request_dma_chain : Request a chain of DMA channels
1190  *
1191  * @param dev_id - Device id using the dma channel
1192  * @param dev_name - Device name
1193  * @param callback - Call back function
1194  * @chain_id -
1195  * @no_of_chans - Number of channels requested
1196  * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1197  *                                            OMAP_DMA_DYNAMIC_CHAIN
1198  * @params - Channel parameters
1199  *
1200  * @return - Succes : 0
1201  *           Failure: -EINVAL/-ENOMEM
1202  */
1203 int omap_request_dma_chain(int dev_id, const char *dev_name,
1204                            void (*callback) (int chain_id, u16 ch_status,
1205                                              void *data),
1206                            int *chain_id, int no_of_chans, int chain_mode,
1207                            struct omap_dma_channel_params params)
1208 {
1209         int *channels;
1210         int i, err;
1211
1212         /* Is the chain mode valid ? */
1213         if (chain_mode != OMAP_DMA_STATIC_CHAIN
1214                         && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1215                 printk(KERN_ERR "Invalid chain mode requested\n");
1216                 return -EINVAL;
1217         }
1218
1219         if (unlikely((no_of_chans < 1
1220                         || no_of_chans > dma_lch_count))) {
1221                 printk(KERN_ERR "Invalid Number of channels requested\n");
1222                 return -EINVAL;
1223         }
1224
1225         /* Allocate a queue to maintain the status of the channels
1226          * in the chain */
1227         channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1228         if (channels == NULL) {
1229                 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1230                 return -ENOMEM;
1231         }
1232
1233         /* request and reserve DMA channels for the chain */
1234         for (i = 0; i < no_of_chans; i++) {
1235                 err = omap_request_dma(dev_id, dev_name,
1236                                         callback, NULL, &channels[i]);
1237                 if (err < 0) {
1238                         int j;
1239                         for (j = 0; j < i; j++)
1240                                 omap_free_dma(channels[j]);
1241                         kfree(channels);
1242                         printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1243                         return err;
1244                 }
1245                 dma_chan[channels[i]].prev_linked_ch = -1;
1246                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1247
1248                 /*
1249                  * Allowing client drivers to set common parameters now,
1250                  * so that later only relevant (src_start, dest_start
1251                  * and element count) can be set
1252                  */
1253                 omap_set_dma_params(channels[i], &params);
1254         }
1255
1256         *chain_id = channels[0];
1257         dma_linked_lch[*chain_id].linked_dmach_q = channels;
1258         dma_linked_lch[*chain_id].chain_mode = chain_mode;
1259         dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1260         dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1261
1262         for (i = 0; i < no_of_chans; i++)
1263                 dma_chan[channels[i]].chain_id = *chain_id;
1264
1265         /* Reset the Queue pointers */
1266         OMAP_DMA_CHAIN_QINIT(*chain_id);
1267
1268         /* Set up the chain */
1269         if (no_of_chans == 1)
1270                 create_dma_lch_chain(channels[0], channels[0]);
1271         else {
1272                 for (i = 0; i < (no_of_chans - 1); i++)
1273                         create_dma_lch_chain(channels[i], channels[i + 1]);
1274         }
1275
1276         return 0;
1277 }
1278 EXPORT_SYMBOL(omap_request_dma_chain);
1279
1280 /**
1281  * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1282  * params after setting it. Dont do this while dma is running!!
1283  *
1284  * @param chain_id - Chained logical channel id.
1285  * @param params
1286  *
1287  * @return - Success : 0
1288  *           Failure : -EINVAL
1289  */
1290 int omap_modify_dma_chain_params(int chain_id,
1291                                 struct omap_dma_channel_params params)
1292 {
1293         int *channels;
1294         u32 i;
1295
1296         /* Check for input params */
1297         if (unlikely((chain_id < 0
1298                         || chain_id >= dma_lch_count))) {
1299                 printk(KERN_ERR "Invalid chain id\n");
1300                 return -EINVAL;
1301         }
1302
1303         /* Check if the chain exists */
1304         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1305                 printk(KERN_ERR "Chain doesn't exists\n");
1306                 return -EINVAL;
1307         }
1308         channels = dma_linked_lch[chain_id].linked_dmach_q;
1309
1310         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1311                 /*
1312                  * Allowing client drivers to set common parameters now,
1313                  * so that later only relevant (src_start, dest_start
1314                  * and element count) can be set
1315                  */
1316                 omap_set_dma_params(channels[i], &params);
1317         }
1318
1319         return 0;
1320 }
1321 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1322
1323 /**
1324  * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1325  *
1326  * @param chain_id
1327  *
1328  * @return - Success : 0
1329  *           Failure : -EINVAL
1330  */
1331 int omap_free_dma_chain(int chain_id)
1332 {
1333         int *channels;
1334         u32 i;
1335
1336         /* Check for input params */
1337         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1338                 printk(KERN_ERR "Invalid chain id\n");
1339                 return -EINVAL;
1340         }
1341
1342         /* Check if the chain exists */
1343         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1344                 printk(KERN_ERR "Chain doesn't exists\n");
1345                 return -EINVAL;
1346         }
1347
1348         channels = dma_linked_lch[chain_id].linked_dmach_q;
1349         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1350                 dma_chan[channels[i]].next_linked_ch = -1;
1351                 dma_chan[channels[i]].prev_linked_ch = -1;
1352                 dma_chan[channels[i]].chain_id = -1;
1353                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1354                 omap_free_dma(channels[i]);
1355         }
1356
1357         kfree(channels);
1358
1359         dma_linked_lch[chain_id].linked_dmach_q = NULL;
1360         dma_linked_lch[chain_id].chain_mode = -1;
1361         dma_linked_lch[chain_id].chain_state = -1;
1362
1363         return (0);
1364 }
1365 EXPORT_SYMBOL(omap_free_dma_chain);
1366
1367 /**
1368  * @brief omap_dma_chain_status - Check if the chain is in
1369  * active / inactive state.
1370  * @param chain_id
1371  *
1372  * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1373  *           Failure : -EINVAL
1374  */
1375 int omap_dma_chain_status(int chain_id)
1376 {
1377         /* Check for input params */
1378         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1379                 printk(KERN_ERR "Invalid chain id\n");
1380                 return -EINVAL;
1381         }
1382
1383         /* Check if the chain exists */
1384         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1385                 printk(KERN_ERR "Chain doesn't exists\n");
1386                 return -EINVAL;
1387         }
1388         pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1389                         dma_linked_lch[chain_id].q_count);
1390
1391         if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1392                 return OMAP_DMA_CHAIN_INACTIVE;
1393
1394         return OMAP_DMA_CHAIN_ACTIVE;
1395 }
1396 EXPORT_SYMBOL(omap_dma_chain_status);
1397
1398 /**
1399  * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1400  * set the params and start the transfer.
1401  *
1402  * @param chain_id
1403  * @param src_start - buffer start address
1404  * @param dest_start - Dest address
1405  * @param elem_count
1406  * @param frame_count
1407  * @param callbk_data - channel callback parameter data.
1408  *
1409  * @return  - Success : 0
1410  *            Failure: -EINVAL/-EBUSY
1411  */
1412 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1413                         int elem_count, int frame_count, void *callbk_data)
1414 {
1415         int *channels;
1416         u32 l, lch;
1417         int start_dma = 0;
1418
1419         /*
1420          * if buffer size is less than 1 then there is
1421          * no use of starting the chain
1422          */
1423         if (elem_count < 1) {
1424                 printk(KERN_ERR "Invalid buffer size\n");
1425                 return -EINVAL;
1426         }
1427
1428         /* Check for input params */
1429         if (unlikely((chain_id < 0
1430                         || chain_id >= dma_lch_count))) {
1431                 printk(KERN_ERR "Invalid chain id\n");
1432                 return -EINVAL;
1433         }
1434
1435         /* Check if the chain exists */
1436         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1437                 printk(KERN_ERR "Chain doesn't exist\n");
1438                 return -EINVAL;
1439         }
1440
1441         /* Check if all the channels in chain are in use */
1442         if (OMAP_DMA_CHAIN_QFULL(chain_id))
1443                 return -EBUSY;
1444
1445         /* Frame count may be negative in case of indexed transfers */
1446         channels = dma_linked_lch[chain_id].linked_dmach_q;
1447
1448         /* Get a free channel */
1449         lch = channels[dma_linked_lch[chain_id].q_tail];
1450
1451         /* Store the callback data */
1452         dma_chan[lch].data = callbk_data;
1453
1454         /* Increment the q_tail */
1455         OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1456
1457         /* Set the params to the free channel */
1458         if (src_start != 0)
1459                 dma_write(src_start, CSSA(lch));
1460         if (dest_start != 0)
1461                 dma_write(dest_start, CDSA(lch));
1462
1463         /* Write the buffer size */
1464         dma_write(elem_count, CEN(lch));
1465         dma_write(frame_count, CFN(lch));
1466
1467         /*
1468          * If the chain is dynamically linked,
1469          * then we may have to start the chain if its not active
1470          */
1471         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1472
1473                 /*
1474                  * In Dynamic chain, if the chain is not started,
1475                  * queue the channel
1476                  */
1477                 if (dma_linked_lch[chain_id].chain_state ==
1478                                                 DMA_CHAIN_NOTSTARTED) {
1479                         /* Enable the link in previous channel */
1480                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1481                                                                 DMA_CH_QUEUED)
1482                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1483                         dma_chan[lch].state = DMA_CH_QUEUED;
1484                 }
1485
1486                 /*
1487                  * Chain is already started, make sure its active,
1488                  * if not then start the chain
1489                  */
1490                 else {
1491                         start_dma = 1;
1492
1493                         if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1494                                                         DMA_CH_STARTED) {
1495                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1496                                 dma_chan[lch].state = DMA_CH_QUEUED;
1497                                 start_dma = 0;
1498                                 if (0 == ((1 << 7) & dma_read(
1499                                         CCR(dma_chan[lch].prev_linked_ch)))) {
1500                                         disable_lnk(dma_chan[lch].
1501                                                     prev_linked_ch);
1502                                         pr_debug("\n prev ch is stopped\n");
1503                                         start_dma = 1;
1504                                 }
1505                         }
1506
1507                         else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1508                                                         == DMA_CH_QUEUED) {
1509                                 enable_lnk(dma_chan[lch].prev_linked_ch);
1510                                 dma_chan[lch].state = DMA_CH_QUEUED;
1511                                 start_dma = 0;
1512                         }
1513                         omap_enable_channel_irq(lch);
1514
1515                         l = dma_read(CCR(lch));
1516
1517                         if ((0 == (l & (1 << 24))))
1518                                 l &= ~(1 << 25);
1519                         else
1520                                 l |= (1 << 25);
1521                         if (start_dma == 1) {
1522                                 if (0 == (l & (1 << 7))) {
1523                                         l |= (1 << 7);
1524                                         dma_chan[lch].state = DMA_CH_STARTED;
1525                                         pr_debug("starting %d\n", lch);
1526                                         dma_write(l, CCR(lch));
1527                                 } else
1528                                         start_dma = 0;
1529                         } else {
1530                                 if (0 == (l & (1 << 7)))
1531                                         dma_write(l, CCR(lch));
1532                         }
1533                         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1534                 }
1535         }
1536
1537         return 0;
1538 }
1539 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1540
1541 /**
1542  * @brief omap_start_dma_chain_transfers - Start the chain
1543  *
1544  * @param chain_id
1545  *
1546  * @return - Success : 0
1547  *           Failure : -EINVAL/-EBUSY
1548  */
1549 int omap_start_dma_chain_transfers(int chain_id)
1550 {
1551         int *channels;
1552         u32 l, i;
1553
1554         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1555                 printk(KERN_ERR "Invalid chain id\n");
1556                 return -EINVAL;
1557         }
1558
1559         channels = dma_linked_lch[chain_id].linked_dmach_q;
1560
1561         if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1562                 printk(KERN_ERR "Chain is already started\n");
1563                 return -EBUSY;
1564         }
1565
1566         if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1567                 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1568                                                                         i++) {
1569                         enable_lnk(channels[i]);
1570                         omap_enable_channel_irq(channels[i]);
1571                 }
1572         } else {
1573                 omap_enable_channel_irq(channels[0]);
1574         }
1575
1576         l = dma_read(CCR(channels[0]));
1577         l |= (1 << 7);
1578         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1579         dma_chan[channels[0]].state = DMA_CH_STARTED;
1580
1581         if ((0 == (l & (1 << 24))))
1582                 l &= ~(1 << 25);
1583         else
1584                 l |= (1 << 25);
1585         dma_write(l, CCR(channels[0]));
1586
1587         dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1588
1589         return 0;
1590 }
1591 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1592
1593 /**
1594  * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1595  *
1596  * @param chain_id
1597  *
1598  * @return - Success : 0
1599  *           Failure : EINVAL
1600  */
1601 int omap_stop_dma_chain_transfers(int chain_id)
1602 {
1603         int *channels;
1604         u32 l, i;
1605         u32 sys_cf;
1606
1607         /* Check for input params */
1608         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1609                 printk(KERN_ERR "Invalid chain id\n");
1610                 return -EINVAL;
1611         }
1612
1613         /* Check if the chain exists */
1614         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1615                 printk(KERN_ERR "Chain doesn't exists\n");
1616                 return -EINVAL;
1617         }
1618         channels = dma_linked_lch[chain_id].linked_dmach_q;
1619
1620         /*
1621          * DMA Errata:
1622          * Special programming model needed to disable DMA before end of block
1623          */
1624         sys_cf = dma_read(OCP_SYSCONFIG);
1625         l = sys_cf;
1626         /* Middle mode reg set no Standby */
1627         l &= ~((1 << 12)|(1 << 13));
1628         dma_write(l, OCP_SYSCONFIG);
1629
1630         for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1631
1632                 /* Stop the Channel transmission */
1633                 l = dma_read(CCR(channels[i]));
1634                 l &= ~(1 << 7);
1635                 dma_write(l, CCR(channels[i]));
1636
1637                 /* Disable the link in all the channels */
1638                 disable_lnk(channels[i]);
1639                 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1640
1641         }
1642         dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1643
1644         /* Reset the Queue pointers */
1645         OMAP_DMA_CHAIN_QINIT(chain_id);
1646
1647         /* Errata - put in the old value */
1648         dma_write(sys_cf, OCP_SYSCONFIG);
1649
1650         return 0;
1651 }
1652 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1653
1654 /* Get the index of the ongoing DMA in chain */
1655 /**
1656  * @brief omap_get_dma_chain_index - Get the element and frame index
1657  * of the ongoing DMA in chain
1658  *
1659  * @param chain_id
1660  * @param ei - Element index
1661  * @param fi - Frame index
1662  *
1663  * @return - Success : 0
1664  *           Failure : -EINVAL
1665  */
1666 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1667 {
1668         int lch;
1669         int *channels;
1670
1671         /* Check for input params */
1672         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1673                 printk(KERN_ERR "Invalid chain id\n");
1674                 return -EINVAL;
1675         }
1676
1677         /* Check if the chain exists */
1678         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1679                 printk(KERN_ERR "Chain doesn't exists\n");
1680                 return -EINVAL;
1681         }
1682         if ((!ei) || (!fi))
1683                 return -EINVAL;
1684
1685         channels = dma_linked_lch[chain_id].linked_dmach_q;
1686
1687         /* Get the current channel */
1688         lch = channels[dma_linked_lch[chain_id].q_head];
1689
1690         *ei = dma_read(CCEN(lch));
1691         *fi = dma_read(CCFN(lch));
1692
1693         return 0;
1694 }
1695 EXPORT_SYMBOL(omap_get_dma_chain_index);
1696
1697 /**
1698  * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1699  * ongoing DMA in chain
1700  *
1701  * @param chain_id
1702  *
1703  * @return - Success : Destination position
1704  *           Failure : -EINVAL
1705  */
1706 int omap_get_dma_chain_dst_pos(int chain_id)
1707 {
1708         int lch;
1709         int *channels;
1710
1711         /* Check for input params */
1712         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1713                 printk(KERN_ERR "Invalid chain id\n");
1714                 return -EINVAL;
1715         }
1716
1717         /* Check if the chain exists */
1718         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1719                 printk(KERN_ERR "Chain doesn't exists\n");
1720                 return -EINVAL;
1721         }
1722
1723         channels = dma_linked_lch[chain_id].linked_dmach_q;
1724
1725         /* Get the current channel */
1726         lch = channels[dma_linked_lch[chain_id].q_head];
1727
1728         return dma_read(CDAC(lch));
1729 }
1730 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1731
1732 /**
1733  * @brief omap_get_dma_chain_src_pos - Get the source position
1734  * of the ongoing DMA in chain
1735  * @param chain_id
1736  *
1737  * @return - Success : Destination position
1738  *           Failure : -EINVAL
1739  */
1740 int omap_get_dma_chain_src_pos(int chain_id)
1741 {
1742         int lch;
1743         int *channels;
1744
1745         /* Check for input params */
1746         if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1747                 printk(KERN_ERR "Invalid chain id\n");
1748                 return -EINVAL;
1749         }
1750
1751         /* Check if the chain exists */
1752         if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1753                 printk(KERN_ERR "Chain doesn't exists\n");
1754                 return -EINVAL;
1755         }
1756
1757         channels = dma_linked_lch[chain_id].linked_dmach_q;
1758
1759         /* Get the current channel */
1760         lch = channels[dma_linked_lch[chain_id].q_head];
1761
1762         return dma_read(CSAC(lch));
1763 }
1764 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1765 #endif  /* ifndef CONFIG_ARCH_OMAP1 */
1766
1767 /*----------------------------------------------------------------------------*/
1768
1769 #ifdef CONFIG_ARCH_OMAP1
1770
1771 static int omap1_dma_handle_ch(int ch)
1772 {
1773         u32 csr;
1774
1775         if (enable_1510_mode && ch >= 6) {
1776                 csr = dma_chan[ch].saved_csr;
1777                 dma_chan[ch].saved_csr = 0;
1778         } else
1779                 csr = dma_read(CSR(ch));
1780         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1781                 dma_chan[ch + 6].saved_csr = csr >> 7;
1782                 csr &= 0x7f;
1783         }
1784         if ((csr & 0x3f) == 0)
1785                 return 0;
1786         if (unlikely(dma_chan[ch].dev_id == -1)) {
1787                 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1788                        "%d (CSR %04x)\n", ch, csr);
1789                 return 0;
1790         }
1791         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1792                 printk(KERN_WARNING "DMA timeout with device %d\n",
1793                        dma_chan[ch].dev_id);
1794         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1795                 printk(KERN_WARNING "DMA synchronization event drop occurred "
1796                        "with device %d\n", dma_chan[ch].dev_id);
1797         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1798                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1799         if (likely(dma_chan[ch].callback != NULL))
1800                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1801
1802         return 1;
1803 }
1804
1805 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1806 {
1807         int ch = ((int) dev_id) - 1;
1808         int handled = 0;
1809
1810         for (;;) {
1811                 int handled_now = 0;
1812
1813                 handled_now += omap1_dma_handle_ch(ch);
1814                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1815                         handled_now += omap1_dma_handle_ch(ch + 6);
1816                 if (!handled_now)
1817                         break;
1818                 handled += handled_now;
1819         }
1820
1821         return handled ? IRQ_HANDLED : IRQ_NONE;
1822 }
1823
1824 #else
1825 #define omap1_dma_irq_handler   NULL
1826 #endif
1827
1828 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
1829
1830 static int omap2_dma_handle_ch(int ch)
1831 {
1832         u32 status = dma_read(CSR(ch));
1833
1834         if (!status) {
1835                 if (printk_ratelimit())
1836                         printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1837                                 ch);
1838                 dma_write(1 << ch, IRQSTATUS_L0);
1839                 return 0;
1840         }
1841         if (unlikely(dma_chan[ch].dev_id == -1)) {
1842                 if (printk_ratelimit())
1843                         printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1844                                         "channel %d\n", status, ch);
1845                 return 0;
1846         }
1847         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1848                 printk(KERN_INFO
1849                        "DMA synchronization event drop occurred with device "
1850                        "%d\n", dma_chan[ch].dev_id);
1851         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1852                 printk(KERN_INFO "DMA transaction error with device %d\n",
1853                        dma_chan[ch].dev_id);
1854                 if (cpu_class_is_omap2()) {
1855                         /* Errata: sDMA Channel is not disabled
1856                          * after a transaction error. So we explicitely
1857                          * disable the channel
1858                          */
1859                         u32 ccr;
1860
1861                         ccr = dma_read(CCR(ch));
1862                         ccr &= ~OMAP_DMA_CCR_EN;
1863                         dma_write(ccr, CCR(ch));
1864                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1865                 }
1866         }
1867         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1868                 printk(KERN_INFO "DMA secure error with device %d\n",
1869                        dma_chan[ch].dev_id);
1870         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1871                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1872                        dma_chan[ch].dev_id);
1873
1874         dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
1875         dma_write(1 << ch, IRQSTATUS_L0);
1876
1877         /* If the ch is not chained then chain_id will be -1 */
1878         if (dma_chan[ch].chain_id != -1) {
1879                 int chain_id = dma_chan[ch].chain_id;
1880                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1881                 if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
1882                         dma_chan[dma_chan[ch].next_linked_ch].state =
1883                                                         DMA_CH_STARTED;
1884                 if (dma_linked_lch[chain_id].chain_mode ==
1885                                                 OMAP_DMA_DYNAMIC_CHAIN)
1886                         disable_lnk(ch);
1887
1888                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1889                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1890
1891                 status = dma_read(CSR(ch));
1892         }
1893
1894         if (likely(dma_chan[ch].callback != NULL))
1895                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1896
1897         dma_write(status, CSR(ch));
1898
1899         return 0;
1900 }
1901
1902 /* STATUS register count is from 1-32 while our is 0-31 */
1903 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1904 {
1905         u32 val;
1906         int i;
1907
1908         val = dma_read(IRQSTATUS_L0);
1909         if (val == 0) {
1910                 if (printk_ratelimit())
1911                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1912                 return IRQ_HANDLED;
1913         }
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         dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
2327                                 GFP_KERNEL);
2328         if (!dma_chan)
2329                 return -ENOMEM;
2330
2331         if (cpu_class_is_omap2()) {
2332                 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2333                                                 dma_lch_count, GFP_KERNEL);
2334                 if (!dma_linked_lch) {
2335                         kfree(dma_chan);
2336                         return -ENOMEM;
2337                 }
2338         }
2339
2340         if (cpu_is_omap15xx()) {
2341                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
2342                 dma_chan_count = 9;
2343                 enable_1510_mode = 1;
2344         } else if (cpu_is_omap16xx() || cpu_is_omap730()) {
2345                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
2346                        dma_read(HW_ID));
2347                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
2348                        (dma_read(CAPS_0_U) << 16) |
2349                        dma_read(CAPS_0_L),
2350                        (dma_read(CAPS_1_U) << 16) |
2351                        dma_read(CAPS_1_L),
2352                        dma_read(CAPS_2), dma_read(CAPS_3),
2353                        dma_read(CAPS_4));
2354                 if (!enable_1510_mode) {
2355                         u16 w;
2356
2357                         /* Disable OMAP 3.0/3.1 compatibility mode. */
2358                         w = dma_read(GSCR);
2359                         w |= 1 << 3;
2360                         dma_write(w, GSCR);
2361                         dma_chan_count = 16;
2362                 } else
2363                         dma_chan_count = 9;
2364                 if (cpu_is_omap16xx()) {
2365                         u16 w;
2366
2367                         /* this would prevent OMAP sleep */
2368                         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
2369                         w &= ~(1 << 8);
2370                         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
2371                 }
2372         } else if (cpu_class_is_omap2()) {
2373                 u8 revision = dma_read(REVISION) & 0xff;
2374                 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
2375                        revision >> 4, revision & 0xf);
2376                 dma_chan_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2377         } else {
2378                 dma_chan_count = 0;
2379                 return 0;
2380         }
2381
2382         spin_lock_init(&lcd_dma.lock);
2383         spin_lock_init(&dma_chan_lock);
2384
2385         for (ch = 0; ch < dma_chan_count; ch++) {
2386                 omap_clear_dma(ch);
2387                 dma_chan[ch].dev_id = -1;
2388                 dma_chan[ch].next_lch = -1;
2389
2390                 if (ch >= 6 && enable_1510_mode)
2391                         continue;
2392
2393                 if (cpu_class_is_omap1()) {
2394                         /*
2395                          * request_irq() doesn't like dev_id (ie. ch) being
2396                          * zero, so we have to kludge around this.
2397                          */
2398                         r = request_irq(omap1_dma_irq[ch],
2399                                         omap1_dma_irq_handler, 0, "DMA",
2400                                         (void *) (ch + 1));
2401                         if (r != 0) {
2402                                 int i;
2403
2404                                 printk(KERN_ERR "unable to request IRQ %d "
2405                                        "for DMA (error %d)\n",
2406                                        omap1_dma_irq[ch], r);
2407                                 for (i = 0; i < ch; i++)
2408                                         free_irq(omap1_dma_irq[i],
2409                                                  (void *) (i + 1));
2410                                 return r;
2411                         }
2412                 }
2413         }
2414
2415         if (cpu_is_omap2430() || cpu_is_omap34xx())
2416                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2417                                 DMA_DEFAULT_FIFO_DEPTH, 0);
2418
2419         if (cpu_class_is_omap2())
2420                 setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);
2421
2422         /* FIXME: Update LCD DMA to work on 24xx */
2423         if (cpu_class_is_omap1()) {
2424                 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
2425                                 "LCD DMA", NULL);
2426                 if (r != 0) {
2427                         int i;
2428
2429                         printk(KERN_ERR "unable to request IRQ for LCD DMA "
2430                                "(error %d)\n", r);
2431                         for (i = 0; i < dma_chan_count; i++)
2432                                 free_irq(omap1_dma_irq[i], (void *) (i + 1));
2433                         return r;
2434                 }
2435         }
2436
2437         return 0;
2438 }
2439
2440 arch_initcall(omap_init_dma);
2441
2442