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   1 /*
   2  * linux/arch/arm/plat-omap/dma.c
   3  *
   4  * Copyright (C) 2003 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 support Copyright (C) 2004-2005 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
  28 #include <asm/system.h>
  29 #include <asm/irq.h>
  30 #include <asm/hardware.h>
  31 #include <asm/dma.h>
  32 #include <asm/io.h>
  33
  34 #include <asm/arch/tc.h>
  35
  36 #define DEBUG_PRINTS
  37 #undef DEBUG_PRINTS
  38 #ifdef DEBUG_PRINTS
  39 #define debug_printk(x) printk x
  40 #else
  41 #define debug_printk(x)
  42 #endif
  43
  44 #define OMAP_DMA_ACTIVE         0x01
  45 #define OMAP_DMA_CCR_EN         (1 << 7)
  46
  47 #define OMAP_FUNC_MUX_ARM_BASE  (0xfffe1000 + 0xec)
  48
  49 static int enable_1510_mode = 0;
  50
  51 struct omap_dma_lch {
  52         int next_lch;
  53         int dev_id;
  54         u16 saved_csr;
  55         u16 enabled_irqs;
  56         const char *dev_name;
  57         void (* callback)(int lch, u16 ch_status, void *data);
  58         void *data;
  59         long flags;
  60 };
  61
  62 static int dma_chan_count;
  63
  64 static spinlock_t dma_chan_lock;
  65 static struct omap_dma_lch dma_chan[OMAP_LOGICAL_DMA_CH_COUNT];
  66
  67 static const u8 omap1_dma_irq[OMAP_LOGICAL_DMA_CH_COUNT] = {
  68         INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
  69         INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
  70         INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
  71         INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
  72         INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
  73 };
  74
  75 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
  76                                                 __FUNCTION__);
  77
  78 #ifdef CONFIG_ARCH_OMAP15XX
  79 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
  80 int omap_dma_in_1510_mode(void)
  81 {
  82         return enable_1510_mode;
  83 }
  84 #else
  85 #define omap_dma_in_1510_mode()         0
  86 #endif
  87
  88 #ifdef CONFIG_ARCH_OMAP1
  89 static inline int get_gdma_dev(int req)
  90 {
  91         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
  92         int shift = ((req - 1) % 5) * 6;
  93
  94         return ((omap_readl(reg) >> shift) & 0x3f) + 1;
  95 }
  96
  97 static inline void set_gdma_dev(int req, int dev)
  98 {
  99         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 100         int shift = ((req - 1) % 5) * 6;
 101         u32 l;
 102
 103         l = omap_readl(reg);
 104         l &= ~(0x3f << shift);
 105         l |= (dev - 1) << shift;
 106         omap_writel(l, reg);
 107 }
 108 #else
 109 #define set_gdma_dev(req, dev)  do {} while (0)
 110 #endif
 111
 112 static void clear_lch_regs(int lch)
 113 {
 114         int i;
 115         u32 lch_base = OMAP_DMA_BASE + lch * 0x40;
 116
 117         for (i = 0; i < 0x2c; i += 2)
 118                 omap_writew(0, lch_base + i);
 119 }
 120
 121 void omap_set_dma_priority(int dst_port, int priority)
 122 {
 123         unsigned long reg;
 124         u32 l;
 125
 126         switch (dst_port) {
 127         case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 128                 reg = OMAP_TC_OCPT1_PRIOR;
 129                 break;
 130         case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 131                 reg = OMAP_TC_OCPT2_PRIOR;
 132                 break;
 133         case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 134                 reg = OMAP_TC_EMIFF_PRIOR;
 135                 break;
 136         case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 137                 reg = OMAP_TC_EMIFS_PRIOR;
 138                 break;
 139         default:
 140                 BUG();
 141                 return;
 142         }
 143         l = omap_readl(reg);
 144         l &= ~(0xf << 8);
 145         l |= (priority & 0xf) << 8;
 146         omap_writel(l, reg);
 147 }
 148
 149 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 150                                   int frame_count, int sync_mode,
 151                                   int dma_trigger, int src_or_dst_synch)
 152 {
 153         OMAP_DMA_CSDP_REG(lch) &= ~0x03;
 154         OMAP_DMA_CSDP_REG(lch) |= data_type;
 155
 156         if (cpu_class_is_omap1()) {
 157                 OMAP_DMA_CCR_REG(lch) &= ~(1 << 5);
 158                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 159                         OMAP_DMA_CCR_REG(lch) |= 1 << 5;
 160
 161                 OMAP1_DMA_CCR2_REG(lch) &= ~(1 << 2);
 162                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 163                         OMAP1_DMA_CCR2_REG(lch) |= 1 << 2;
 164         }
 165
 166         if (cpu_is_omap24xx() && dma_trigger) {
 167                 u32 val = OMAP_DMA_CCR_REG(lch);
 168
 169                 if (dma_trigger > 63)
 170                         val |= 1 << 20;
 171                 if (dma_trigger > 31)
 172                         val |= 1 << 19;
 173
 174                 val |= (dma_trigger & 0x1f);
 175
 176                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 177                         val |= 1 << 5;
 178
 179                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 180                         val |= 1 << 18;
 181
 182                 if (src_or_dst_synch)
 183                         val |= 1 << 24;         /* source synch */
 184                 else
 185                         val &= ~(1 << 24);      /* dest synch */
 186
 187                 OMAP_DMA_CCR_REG(lch) = val;
 188         }
 189
 190         OMAP_DMA_CEN_REG(lch) = elem_count;
 191         OMAP_DMA_CFN_REG(lch) = frame_count;
 192 }
 193
 194 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
 195 {
 196         u16 w;
 197
 198         BUG_ON(omap_dma_in_1510_mode());
 199
 200         if (cpu_is_omap24xx()) {
 201                 REVISIT_24XX();
 202                 return;
 203         }
 204
 205         w = OMAP1_DMA_CCR2_REG(lch) & ~0x03;
 206         switch (mode) {
 207         case OMAP_DMA_CONSTANT_FILL:
 208                 w |= 0x01;
 209                 break;
 210         case OMAP_DMA_TRANSPARENT_COPY:
 211                 w |= 0x02;
 212                 break;
 213         case OMAP_DMA_COLOR_DIS:
 214                 break;
 215         default:
 216                 BUG();
 217         }
 218         OMAP1_DMA_CCR2_REG(lch) = w;
 219
 220         w = OMAP1_DMA_LCH_CTRL_REG(lch) & ~0x0f;
 221         /* Default is channel type 2D */
 222         if (mode) {
 223                 OMAP1_DMA_COLOR_L_REG(lch) = (u16)color;
 224                 OMAP1_DMA_COLOR_U_REG(lch) = (u16)(color >> 16);
 225                 w |= 1;         /* Channel type G */
 226         }
 227         OMAP1_DMA_LCH_CTRL_REG(lch) = w;
 228 }
 229
 230 /* Note that src_port is only for omap1 */
 231 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 232                              unsigned long src_start,
 233                              int src_ei, int src_fi)
 234 {
 235         if (cpu_class_is_omap1()) {
 236                 OMAP_DMA_CSDP_REG(lch) &= ~(0x1f << 2);
 237                 OMAP_DMA_CSDP_REG(lch) |= src_port << 2;
 238         }
 239
 240         OMAP_DMA_CCR_REG(lch) &= ~(0x03 << 12);
 241         OMAP_DMA_CCR_REG(lch) |= src_amode << 12;
 242
 243         if (cpu_class_is_omap1()) {
 244                 OMAP1_DMA_CSSA_U_REG(lch) = src_start >> 16;
 245                 OMAP1_DMA_CSSA_L_REG(lch) = src_start;
 246         }
 247
 248         if (cpu_is_omap24xx())
 249                 OMAP2_DMA_CSSA_REG(lch) = src_start;
 250
 251         OMAP_DMA_CSEI_REG(lch) = src_ei;
 252         OMAP_DMA_CSFI_REG(lch) = src_fi;
 253 }
 254
 255 void omap_set_dma_params(int lch, struct omap_dma_channel_params * params)
 256 {
 257         omap_set_dma_transfer_params(lch, params->data_type,
 258                                      params->elem_count, params->frame_count,
 259                                      params->sync_mode, params->trigger,
 260                                      params->src_or_dst_synch);
 261         omap_set_dma_src_params(lch, params->src_port,
 262                                 params->src_amode, params->src_start,
 263                                 params->src_ei, params->src_fi);
 264
 265         omap_set_dma_dest_params(lch, params->dst_port,
 266                                  params->dst_amode, params->dst_start,
 267                                  params->dst_ei, params->dst_fi);
 268 }
 269
 270 void omap_set_dma_src_index(int lch, int eidx, int fidx)
 271 {
 272         if (cpu_is_omap24xx()) {
 273                 REVISIT_24XX();
 274                 return;
 275         }
 276         OMAP_DMA_CSEI_REG(lch) = eidx;
 277         OMAP_DMA_CSFI_REG(lch) = fidx;
 278 }
 279
 280 void omap_set_dma_src_data_pack(int lch, int enable)
 281 {
 282         OMAP_DMA_CSDP_REG(lch) &= ~(1 << 6);
 283         if (enable)
 284                 OMAP_DMA_CSDP_REG(lch) |= (1 << 6);
 285 }
 286
 287 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 288 {
 289         OMAP_DMA_CSDP_REG(lch) &= ~(0x03 << 7);
 290
 291         switch (burst_mode) {
 292         case OMAP_DMA_DATA_BURST_DIS:
 293                 break;
 294         case OMAP_DMA_DATA_BURST_4:
 295                 OMAP_DMA_CSDP_REG(lch) |= (0x02 << 7);
 296                 break;
 297         case OMAP_DMA_DATA_BURST_8:
 298                 /* not supported by current hardware
 299                  * w |= (0x03 << 7);
 300                  * fall through
 301                  */
 302         default:
 303                 BUG();
 304         }
 305 }
 306
 307 /* Note that dest_port is only for OMAP1 */
 308 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 309                               unsigned long dest_start,
 310                               int dst_ei, int dst_fi)
 311 {
 312         if (cpu_class_is_omap1()) {
 313                 OMAP_DMA_CSDP_REG(lch) &= ~(0x1f << 9);
 314                 OMAP_DMA_CSDP_REG(lch) |= dest_port << 9;
 315         }
 316
 317         OMAP_DMA_CCR_REG(lch) &= ~(0x03 << 14);
 318         OMAP_DMA_CCR_REG(lch) |= dest_amode << 14;
 319
 320         if (cpu_class_is_omap1()) {
 321                 OMAP1_DMA_CDSA_U_REG(lch) = dest_start >> 16;
 322                 OMAP1_DMA_CDSA_L_REG(lch) = dest_start;
 323         }
 324
 325         if (cpu_is_omap24xx())
 326                 OMAP2_DMA_CDSA_REG(lch) = dest_start;
 327
 328         OMAP_DMA_CDEI_REG(lch) = dst_ei;
 329         OMAP_DMA_CDFI_REG(lch) = dst_fi;
 330 }
 331
 332 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
 333 {
 334         if (cpu_is_omap24xx()) {
 335                 REVISIT_24XX();
 336                 return;
 337         }
 338         OMAP_DMA_CDEI_REG(lch) = eidx;
 339         OMAP_DMA_CDFI_REG(lch) = fidx;
 340 }
 341
 342 void omap_set_dma_dest_data_pack(int lch, int enable)
 343 {
 344         OMAP_DMA_CSDP_REG(lch) &= ~(1 << 13);
 345         if (enable)
 346                 OMAP_DMA_CSDP_REG(lch) |= 1 << 13;
 347 }
 348
 349 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 350 {
 351         OMAP_DMA_CSDP_REG(lch) &= ~(0x03 << 14);
 352
 353         switch (burst_mode) {
 354         case OMAP_DMA_DATA_BURST_DIS:
 355                 break;
 356         case OMAP_DMA_DATA_BURST_4:
 357                 OMAP_DMA_CSDP_REG(lch) |= (0x02 << 14);
 358                 break;
 359         case OMAP_DMA_DATA_BURST_8:
 360                 OMAP_DMA_CSDP_REG(lch) |= (0x03 << 14);
 361                 break;
 362         default:
 363                 printk(KERN_ERR "Invalid DMA burst mode\n");
 364                 BUG();
 365                 return;
 366         }
 367 }
 368
 369 static inline void omap_enable_channel_irq(int lch)
 370 {
 371         u32 status;
 372
 373         /* Read CSR to make sure it's cleared. */
 374         status = OMAP_DMA_CSR_REG(lch);
 375
 376         /* Enable some nice interrupts. */
 377         OMAP_DMA_CICR_REG(lch) = dma_chan[lch].enabled_irqs;
 378
 379         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 380 }
 381
 382 static void omap_disable_channel_irq(int lch)
 383 {
 384         if (cpu_is_omap24xx())
 385                 OMAP_DMA_CICR_REG(lch) = 0;
 386 }
 387
 388 void omap_enable_dma_irq(int lch, u16 bits)
 389 {
 390         dma_chan[lch].enabled_irqs |= bits;
 391 }
 392
 393 void omap_disable_dma_irq(int lch, u16 bits)
 394 {
 395         dma_chan[lch].enabled_irqs &= ~bits;
 396 }
 397
 398 static inline void enable_lnk(int lch)
 399 {
 400         if (cpu_class_is_omap1())
 401                 OMAP_DMA_CLNK_CTRL_REG(lch) &= ~(1 << 14);
 402
 403         /* Set the ENABLE_LNK bits */
 404         if (dma_chan[lch].next_lch != -1)
 405                 OMAP_DMA_CLNK_CTRL_REG(lch) =
 406                         dma_chan[lch].next_lch | (1 << 15);
 407 }
 408
 409 static inline void disable_lnk(int lch)
 410 {
 411         /* Disable interrupts */
 412         if (cpu_class_is_omap1()) {
 413                 OMAP_DMA_CICR_REG(lch) = 0;
 414                 /* Set the STOP_LNK bit */
 415                 OMAP_DMA_CLNK_CTRL_REG(lch) |= 1 << 14;
 416         }
 417
 418         if (cpu_is_omap24xx()) {
 419                 omap_disable_channel_irq(lch);
 420                 /* Clear the ENABLE_LNK bit */
 421                 OMAP_DMA_CLNK_CTRL_REG(lch) &= ~(1 << 15);
 422         }
 423
 424         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 425 }
 426
 427 static inline void omap2_enable_irq_lch(int lch)
 428 {
 429         u32 val;
 430
 431         if (!cpu_is_omap24xx())
 432                 return;
 433
 434         val = omap_readl(OMAP_DMA4_IRQENABLE_L0);
 435         val |= 1 << lch;
 436         omap_writel(val, OMAP_DMA4_IRQENABLE_L0);
 437 }
 438
 439 int omap_request_dma(int dev_id, const char *dev_name,
 440                      void (* callback)(int lch, u16 ch_status, void *data),
 441                      void *data, int *dma_ch_out)
 442 {
 443         int ch, free_ch = -1;
 444         unsigned long flags;
 445         struct omap_dma_lch *chan;
 446
 447         spin_lock_irqsave(&dma_chan_lock, flags);
 448         for (ch = 0; ch < dma_chan_count; ch++) {
 449                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 450                         free_ch = ch;
 451                         if (dev_id == 0)
 452                                 break;
 453                 }
 454         }
 455         if (free_ch == -1) {
 456                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 457                 return -EBUSY;
 458         }
 459         chan = dma_chan + free_ch;
 460         chan->dev_id = dev_id;
 461
 462         if (cpu_class_is_omap1())
 463                 clear_lch_regs(free_ch);
 464
 465         if (cpu_is_omap24xx())
 466                 omap_clear_dma(free_ch);
 467
 468         spin_unlock_irqrestore(&dma_chan_lock, flags);
 469
 470         chan->dev_name = dev_name;
 471         chan->callback = callback;
 472         chan->data = data;
 473         chan->enabled_irqs = OMAP_DMA_TOUT_IRQ | OMAP_DMA_DROP_IRQ |
 474                                 OMAP_DMA_BLOCK_IRQ;
 475
 476         if (cpu_is_omap24xx())
 477                 chan->enabled_irqs |= OMAP2_DMA_TRANS_ERR_IRQ;
 478
 479         if (cpu_is_omap16xx()) {
 480                 /* If the sync device is set, configure it dynamically. */
 481                 if (dev_id != 0) {
 482                         set_gdma_dev(free_ch + 1, dev_id);
 483                         dev_id = free_ch + 1;
 484                 }
 485                 /* Disable the 1510 compatibility mode and set the sync device
 486                  * id. */
 487                 OMAP_DMA_CCR_REG(free_ch) = dev_id | (1 << 10);
 488         } else if (cpu_is_omap730() || cpu_is_omap15xx()) {
 489                 OMAP_DMA_CCR_REG(free_ch) = dev_id;
 490         }
 491
 492         if (cpu_is_omap24xx()) {
 493                 omap2_enable_irq_lch(free_ch);
 494
 495                 omap_enable_channel_irq(free_ch);
 496                 /* Clear the CSR register and IRQ status register */
 497                 OMAP_DMA_CSR_REG(free_ch) = 0x0;
 498                 omap_writel(~0x0, OMAP_DMA4_IRQSTATUS_L0);
 499         }
 500
 501         *dma_ch_out = free_ch;
 502
 503         return 0;
 504 }
 505
 506 void omap_free_dma(int lch)
 507 {
 508         unsigned long flags;
 509
 510         spin_lock_irqsave(&dma_chan_lock, flags);
 511         if (dma_chan[lch].dev_id == -1) {
 512                 printk("omap_dma: trying to free nonallocated DMA channel %d\n",
 513                        lch);
 514                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 515                 return;
 516         }
 517         dma_chan[lch].dev_id = -1;
 518         dma_chan[lch].next_lch = -1;
 519         dma_chan[lch].callback = NULL;
 520         spin_unlock_irqrestore(&dma_chan_lock, flags);
 521
 522         if (cpu_class_is_omap1()) {
 523                 /* Disable all DMA interrupts for the channel. */
 524                 OMAP_DMA_CICR_REG(lch) = 0;
 525                 /* Make sure the DMA transfer is stopped. */
 526                 OMAP_DMA_CCR_REG(lch) = 0;
 527         }
 528
 529         if (cpu_is_omap24xx()) {
 530                 u32 val;
 531                 /* Disable interrupts */
 532                 val = omap_readl(OMAP_DMA4_IRQENABLE_L0);
 533                 val &= ~(1 << lch);
 534                 omap_writel(val, OMAP_DMA4_IRQENABLE_L0);
 535
 536                 /* Clear the CSR register and IRQ status register */
 537                 OMAP_DMA_CSR_REG(lch) = 0x0;
 538
 539                 val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
 540                 val |= 1 << lch;
 541                 omap_writel(val, OMAP_DMA4_IRQSTATUS_L0);
 542
 543                 /* Disable all DMA interrupts for the channel. */
 544                 OMAP_DMA_CICR_REG(lch) = 0;
 545
 546                 /* Make sure the DMA transfer is stopped. */
 547                 OMAP_DMA_CCR_REG(lch) = 0;
 548                 omap_clear_dma(lch);
 549         }
 550 }
 551
 552 /*
 553  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 554  * through omap_start_dma(). Any buffers in flight are discarded.
 555  */
 556 void omap_clear_dma(int lch)
 557 {
 558         unsigned long flags;
 559
 560         local_irq_save(flags);
 561
 562         if (cpu_class_is_omap1()) {
 563                 int status;
 564                 OMAP_DMA_CCR_REG(lch) &= ~OMAP_DMA_CCR_EN;
 565
 566                 /* Clear pending interrupts */
 567                 status = OMAP_DMA_CSR_REG(lch);
 568         }
 569
 570         if (cpu_is_omap24xx()) {
 571                 int i;
 572                 u32 lch_base = OMAP24XX_DMA_BASE + lch * 0x60 + 0x80;
 573                 for (i = 0; i < 0x44; i += 4)
 574                         omap_writel(0, lch_base + i);
 575         }
 576
 577         local_irq_restore(flags);
 578 }
 579
 580 void omap_start_dma(int lch)
 581 {
 582         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 583                 int next_lch, cur_lch;
 584                 char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
 585
 586                 dma_chan_link_map[lch] = 1;
 587                 /* Set the link register of the first channel */
 588                 enable_lnk(lch);
 589
 590                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 591                 cur_lch = dma_chan[lch].next_lch;
 592                 do {
 593                         next_lch = dma_chan[cur_lch].next_lch;
 594
 595                         /* The loop case: we've been here already */
 596                         if (dma_chan_link_map[cur_lch])
 597                                 break;
 598                         /* Mark the current channel */
 599                         dma_chan_link_map[cur_lch] = 1;
 600
 601                         enable_lnk(cur_lch);
 602                         omap_enable_channel_irq(cur_lch);
 603
 604                         cur_lch = next_lch;
 605                 } while (next_lch != -1);
 606         } else if (cpu_is_omap24xx()) {
 607                 /* Errata: Need to write lch even if not using chaining */
 608                 OMAP_DMA_CLNK_CTRL_REG(lch) = lch;
 609         }
 610
 611         omap_enable_channel_irq(lch);
 612
 613         /* Errata: On ES2.0 BUFFERING disable must be set.
 614          * This will always fail on ES1.0 */
 615         if (cpu_is_omap24xx()) {
 616                 OMAP_DMA_CCR_REG(lch) |= OMAP_DMA_CCR_EN;
 617         }
 618
 619         OMAP_DMA_CCR_REG(lch) |= OMAP_DMA_CCR_EN;
 620
 621         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 622 }
 623
 624 void omap_stop_dma(int lch)
 625 {
 626         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 627                 int next_lch, cur_lch = lch;
 628                 char dma_chan_link_map[OMAP_LOGICAL_DMA_CH_COUNT];
 629
 630                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 631                 do {
 632                         /* The loop case: we've been here already */
 633                         if (dma_chan_link_map[cur_lch])
 634                                 break;
 635                         /* Mark the current channel */
 636                         dma_chan_link_map[cur_lch] = 1;
 637
 638                         disable_lnk(cur_lch);
 639
 640                         next_lch = dma_chan[cur_lch].next_lch;
 641                         cur_lch = next_lch;
 642                 } while (next_lch != -1);
 643
 644                 return;
 645         }
 646
 647         /* Disable all interrupts on the channel */
 648         if (cpu_class_is_omap1())
 649                 OMAP_DMA_CICR_REG(lch) = 0;
 650
 651         OMAP_DMA_CCR_REG(lch) &= ~OMAP_DMA_CCR_EN;
 652         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 653 }
 654
 655 /*
 656  * Returns current physical source address for the given DMA channel.
 657  * If the channel is running the caller must disable interrupts prior calling
 658  * this function and process the returned value before re-enabling interrupt to
 659  * prevent races with the interrupt handler. Note that in continuous mode there
 660  * is a chance for CSSA_L register overflow inbetween the two reads resulting
 661  * in incorrect return value.
 662  */
 663 dma_addr_t omap_get_dma_src_pos(int lch)
 664 {
 665         dma_addr_t offset;
 666
 667         if (cpu_class_is_omap1())
 668                 offset = (dma_addr_t) (OMAP1_DMA_CSSA_L_REG(lch) |
 669                                        (OMAP1_DMA_CSSA_U_REG(lch) << 16));
 670
 671         if (cpu_is_omap24xx())
 672                 offset = OMAP_DMA_CSAC_REG(lch);
 673
 674         return offset;
 675 }
 676
 677 /*
 678  * Returns current physical destination address for the given DMA channel.
 679  * If the channel is running the caller must disable interrupts prior calling
 680  * this function and process the returned value before re-enabling interrupt to
 681  * prevent races with the interrupt handler. Note that in continuous mode there
 682  * is a chance for CDSA_L register overflow inbetween the two reads resulting
 683  * in incorrect return value.
 684  */
 685 dma_addr_t omap_get_dma_dst_pos(int lch)
 686 {
 687         dma_addr_t offset;
 688
 689         if (cpu_class_is_omap1())
 690                 offset = (dma_addr_t) (OMAP1_DMA_CDSA_L_REG(lch) |
 691                                        (OMAP1_DMA_CDSA_U_REG(lch) << 16));
 692
 693         if (cpu_is_omap24xx())
 694                 offset = OMAP2_DMA_CDSA_REG(lch);
 695
 696         return offset;
 697 }
 698
 699 /*
 700  * Returns current source transfer counting for the given DMA channel.
 701  * Can be used to monitor the progress of a transfer inside a block.
 702  * It must be called with disabled interrupts.
 703  */
 704 int omap_get_dma_src_addr_counter(int lch)
 705 {
 706         return (dma_addr_t) OMAP_DMA_CSAC_REG(lch);
 707 }
 708
 709 int omap_dma_running(void)
 710 {
 711         int lch;
 712
 713         /* Check if LCD DMA is running */
 714         if (cpu_is_omap16xx())
 715                 if (omap_readw(OMAP1610_DMA_LCD_CCR) & OMAP_DMA_CCR_EN)
 716                         return 1;
 717
 718         for (lch = 0; lch < dma_chan_count; lch++)
 719                 if (OMAP_DMA_CCR_REG(lch) & OMAP_DMA_CCR_EN)
 720                         return 1;
 721
 722         return 0;
 723 }
 724
 725 /*
 726  * lch_queue DMA will start right after lch_head one is finished.
 727  * For this DMA link to start, you still need to start (see omap_start_dma)
 728  * the first one. That will fire up the entire queue.
 729  */
 730 void omap_dma_link_lch (int lch_head, int lch_queue)
 731 {
 732         if (omap_dma_in_1510_mode()) {
 733                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
 734                 BUG();
 735                 return;
 736         }
 737
 738         if ((dma_chan[lch_head].dev_id == -1) ||
 739             (dma_chan[lch_queue].dev_id == -1)) {
 740                 printk(KERN_ERR "omap_dma: trying to link "
 741                        "non requested channels\n");
 742                 dump_stack();
 743         }
 744
 745         dma_chan[lch_head].next_lch = lch_queue;
 746 }
 747
 748 /*
 749  * Once the DMA queue is stopped, we can destroy it.
 750  */
 751 void omap_dma_unlink_lch (int lch_head, int lch_queue)
 752 {
 753         if (omap_dma_in_1510_mode()) {
 754                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
 755                 BUG();
 756                 return;
 757         }
 758
 759         if (dma_chan[lch_head].next_lch != lch_queue ||
 760             dma_chan[lch_head].next_lch == -1) {
 761                 printk(KERN_ERR "omap_dma: trying to unlink "
 762                        "non linked channels\n");
 763                 dump_stack();
 764         }
 765
 766
 767         if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
 768             (dma_chan[lch_head].flags & OMAP_DMA_ACTIVE)) {
 769                 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
 770                        "before unlinking\n");
 771                 dump_stack();
 772         }
 773
 774         dma_chan[lch_head].next_lch = -1;
 775 }
 776
 777 /*----------------------------------------------------------------------------*/
 778
 779 #ifdef CONFIG_ARCH_OMAP1
 780
 781 static int omap1_dma_handle_ch(int ch)
 782 {
 783         u16 csr;
 784
 785         if (enable_1510_mode && ch >= 6) {
 786                 csr = dma_chan[ch].saved_csr;
 787                 dma_chan[ch].saved_csr = 0;
 788         } else
 789                 csr = OMAP_DMA_CSR_REG(ch);
 790         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
 791                 dma_chan[ch + 6].saved_csr = csr >> 7;
 792                 csr &= 0x7f;
 793         }
 794         if ((csr & 0x3f) == 0)
 795                 return 0;
 796         if (unlikely(dma_chan[ch].dev_id == -1)) {
 797                 printk(KERN_WARNING "Spurious interrupt from DMA channel "
 798                        "%d (CSR %04x)\n", ch, csr);
 799                 return 0;
 800         }
 801         if (unlikely(csr & OMAP_DMA_TOUT_IRQ))
 802                 printk(KERN_WARNING "DMA timeout with device %d\n",
 803                        dma_chan[ch].dev_id);
 804         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
 805                 printk(KERN_WARNING "DMA synchronization event drop occurred "
 806                        "with device %d\n", dma_chan[ch].dev_id);
 807         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
 808                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
 809         if (likely(dma_chan[ch].callback != NULL))
 810                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
 811         return 1;
 812 }
 813
 814 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id,
 815                                          struct pt_regs *regs)
 816 {
 817         int ch = ((int) dev_id) - 1;
 818         int handled = 0;
 819
 820         for (;;) {
 821                 int handled_now = 0;
 822
 823                 handled_now += omap1_dma_handle_ch(ch);
 824                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
 825                         handled_now += omap1_dma_handle_ch(ch + 6);
 826                 if (!handled_now)
 827                         break;
 828                 handled += handled_now;
 829         }
 830
 831         return handled ? IRQ_HANDLED : IRQ_NONE;
 832 }
 833
 834 #else
 835 #define omap1_dma_irq_handler   NULL
 836 #endif
 837
 838 #ifdef CONFIG_ARCH_OMAP2
 839
 840 static int omap2_dma_handle_ch(int ch)
 841 {
 842         u32 status = OMAP_DMA_CSR_REG(ch);
 843         u32 val;
 844
 845         if (!status)
 846                 return 0;
 847         if (unlikely(dma_chan[ch].dev_id == -1))
 848                 return 0;
 849         /* REVISIT: According to 24xx TRM, there's no TOUT_IE */
 850         if (unlikely(status & OMAP_DMA_TOUT_IRQ))
 851                 printk(KERN_INFO "DMA timeout with device %d\n",
 852                        dma_chan[ch].dev_id);
 853         if (unlikely(status & OMAP_DMA_DROP_IRQ))
 854                 printk(KERN_INFO
 855                        "DMA synchronization event drop occurred with device "
 856                        "%d\n", dma_chan[ch].dev_id);
 857
 858         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ))
 859                 printk(KERN_INFO "DMA transaction error with device %d\n",
 860                        dma_chan[ch].dev_id);
 861
 862         OMAP_DMA_CSR_REG(ch) = 0x20;
 863
 864         val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
 865         /* ch in this function is from 0-31 while in register it is 1-32 */
 866         val = 1 << (ch);
 867         omap_writel(val, OMAP_DMA4_IRQSTATUS_L0);
 868
 869         if (likely(dma_chan[ch].callback != NULL))
 870                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
 871
 872         return 0;
 873 }
 874
 875 /* STATUS register count is from 1-32 while our is 0-31 */
 876 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id,
 877                                          struct pt_regs *regs)
 878 {
 879         u32 val;
 880         int i;
 881
 882         val = omap_readl(OMAP_DMA4_IRQSTATUS_L0);
 883
 884         for (i = 1; i <= OMAP_LOGICAL_DMA_CH_COUNT; i++) {
 885                 int active = val & (1 << (i - 1));
 886                 if (active)
 887                         omap2_dma_handle_ch(i - 1);
 888         }
 889
 890         return IRQ_HANDLED;
 891 }
 892
 893 static struct irqaction omap24xx_dma_irq = {
 894         .name = "DMA",
 895         .handler = omap2_dma_irq_handler,
 896         .flags = SA_INTERRUPT
 897 };
 898
 899 #else
 900 static struct irqaction omap24xx_dma_irq;
 901 #endif
 902
 903 /*----------------------------------------------------------------------------*/
 904
 905 static struct lcd_dma_info {
 906         spinlock_t lock;
 907         int reserved;
 908         void (* callback)(u16 status, void *data);
 909         void *cb_data;
 910
 911         int active;
 912         unsigned long addr, size;
 913         int rotate, data_type, xres, yres;
 914         int vxres;
 915         int mirror;
 916         int xscale, yscale;
 917         int ext_ctrl;
 918         int src_port;
 919         int single_transfer;
 920 } lcd_dma;
 921
 922 void omap_set_lcd_dma_b1(unsigned long addr, u16 fb_xres, u16 fb_yres,
 923                          int data_type)
 924 {
 925         lcd_dma.addr = addr;
 926         lcd_dma.data_type = data_type;
 927         lcd_dma.xres = fb_xres;
 928         lcd_dma.yres = fb_yres;
 929 }
 930
 931 void omap_set_lcd_dma_src_port(int port)
 932 {
 933         lcd_dma.src_port = port;
 934 }
 935
 936 void omap_set_lcd_dma_ext_controller(int external)
 937 {
 938         lcd_dma.ext_ctrl = external;
 939 }
 940
 941 void omap_set_lcd_dma_single_transfer(int single)
 942 {
 943         lcd_dma.single_transfer = single;
 944 }
 945
 946
 947 void omap_set_lcd_dma_b1_rotation(int rotate)
 948 {
 949         if (omap_dma_in_1510_mode()) {
 950                 printk(KERN_ERR "DMA rotation is not supported in 1510 mode\n");
 951                 BUG();
 952                 return;
 953         }
 954         lcd_dma.rotate = rotate;
 955 }
 956
 957 void omap_set_lcd_dma_b1_mirror(int mirror)
 958 {
 959         if (omap_dma_in_1510_mode()) {
 960                 printk(KERN_ERR "DMA mirror is not supported in 1510 mode\n");
 961                 BUG();
 962         }
 963         lcd_dma.mirror = mirror;
 964 }
 965
 966 void omap_set_lcd_dma_b1_vxres(unsigned long vxres)
 967 {
 968         if (omap_dma_in_1510_mode()) {
 969                 printk(KERN_ERR "DMA virtual resulotion is not supported "
 970                                 "in 1510 mode\n");
 971                 BUG();
 972         }
 973         lcd_dma.vxres = vxres;
 974 }
 975
 976 void omap_set_lcd_dma_b1_scale(unsigned int xscale, unsigned int yscale)
 977 {
 978         if (omap_dma_in_1510_mode()) {
 979                 printk(KERN_ERR "DMA scale is not supported in 1510 mode\n");
 980                 BUG();
 981         }
 982         lcd_dma.xscale = xscale;
 983         lcd_dma.yscale = yscale;
 984 }
 985
 986 static void set_b1_regs(void)
 987 {
 988         unsigned long top, bottom;
 989         int es;
 990         u16 w;
 991         unsigned long en, fn;
 992         long ei, fi;
 993         unsigned long vxres;
 994         unsigned int xscale, yscale;
 995
 996         switch (lcd_dma.data_type) {
 997         case OMAP_DMA_DATA_TYPE_S8:
 998                 es = 1;
 999                 break;
1000         case OMAP_DMA_DATA_TYPE_S16:
1001                 es = 2;
1002                 break;
1003         case OMAP_DMA_DATA_TYPE_S32:
1004                 es = 4;
1005                 break;
1006         default:
1007                 BUG();
1008                 return;
1009         }
1010
1011         vxres = lcd_dma.vxres ? lcd_dma.vxres : lcd_dma.xres;
1012         xscale = lcd_dma.xscale ? lcd_dma.xscale : 1;
1013         yscale = lcd_dma.yscale ? lcd_dma.yscale : 1;
1014         BUG_ON(vxres < lcd_dma.xres);
1015 #define PIXADDR(x,y) (lcd_dma.addr + ((y) * vxres * yscale + (x) * xscale) * es)
1016 #define PIXSTEP(sx, sy, dx, dy) (PIXADDR(dx, dy) - PIXADDR(sx, sy) - es + 1)
1017         switch (lcd_dma.rotate) {
1018         case 0:
1019                 if (!lcd_dma.mirror) {
1020                         top = PIXADDR(0, 0);
1021                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1022                         /* 1510 DMA requires the bottom address to be 2 more
1023                          * than the actual last memory access location. */
1024                         if (omap_dma_in_1510_mode() &&
1025                             lcd_dma.data_type == OMAP_DMA_DATA_TYPE_S32)
1026                                 bottom += 2;
1027                         ei = PIXSTEP(0, 0, 1, 0);
1028                         fi = PIXSTEP(lcd_dma.xres - 1, 0, 0, 1);
1029                 } else {
1030                         top = PIXADDR(lcd_dma.xres - 1, 0);
1031                         bottom = PIXADDR(0, lcd_dma.yres - 1);
1032                         ei = PIXSTEP(1, 0, 0, 0);
1033                         fi = PIXSTEP(0, 0, lcd_dma.xres - 1, 1);
1034                 }
1035                 en = lcd_dma.xres;
1036                 fn = lcd_dma.yres;
1037                 break;
1038         case 90:
1039                 if (!lcd_dma.mirror) {
1040                         top = PIXADDR(0, lcd_dma.yres - 1);
1041                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
1042                         ei = PIXSTEP(0, 1, 0, 0);
1043                         fi = PIXSTEP(0, 0, 1, lcd_dma.yres - 1);
1044                 } else {
1045                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1046                         bottom = PIXADDR(0, 0);
1047                         ei = PIXSTEP(0, 1, 0, 0);
1048                         fi = PIXSTEP(1, 0, 0, lcd_dma.yres - 1);
1049                 }
1050                 en = lcd_dma.yres;
1051                 fn = lcd_dma.xres;
1052                 break;
1053         case 180:
1054                 if (!lcd_dma.mirror) {
1055                         top = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1056                         bottom = PIXADDR(0, 0);
1057                         ei = PIXSTEP(1, 0, 0, 0);
1058                         fi = PIXSTEP(0, 1, lcd_dma.xres - 1, 0);
1059                 } else {
1060                         top = PIXADDR(0, lcd_dma.yres - 1);
1061                         bottom = PIXADDR(lcd_dma.xres - 1, 0);
1062                         ei = PIXSTEP(0, 0, 1, 0);
1063                         fi = PIXSTEP(lcd_dma.xres - 1, 1, 0, 0);
1064                 }
1065                 en = lcd_dma.xres;
1066                 fn = lcd_dma.yres;
1067                 break;
1068         case 270:
1069                 if (!lcd_dma.mirror) {
1070                         top = PIXADDR(lcd_dma.xres - 1, 0);
1071                         bottom = PIXADDR(0, lcd_dma.yres - 1);
1072                         ei = PIXSTEP(0, 0, 0, 1);
1073                         fi = PIXSTEP(1, lcd_dma.yres - 1, 0, 0);
1074                 } else {
1075                         top = PIXADDR(0, 0);
1076                         bottom = PIXADDR(lcd_dma.xres - 1, lcd_dma.yres - 1);
1077                         ei = PIXSTEP(0, 0, 0, 1);
1078                         fi = PIXSTEP(0, lcd_dma.yres - 1, 1, 0);
1079                 }
1080                 en = lcd_dma.yres;
1081                 fn = lcd_dma.xres;
1082                 break;
1083         default:
1084                 BUG();
1085                 return; /* Supress warning about uninitialized vars */
1086         }
1087
1088         if (omap_dma_in_1510_mode()) {
1089                 omap_writew(top >> 16, OMAP1510_DMA_LCD_TOP_F1_U);
1090                 omap_writew(top, OMAP1510_DMA_LCD_TOP_F1_L);
1091                 omap_writew(bottom >> 16, OMAP1510_DMA_LCD_BOT_F1_U);
1092                 omap_writew(bottom, OMAP1510_DMA_LCD_BOT_F1_L);
1093
1094                 return;
1095         }
1096
1097         /* 1610 regs */
1098         omap_writew(top >> 16, OMAP1610_DMA_LCD_TOP_B1_U);
1099         omap_writew(top, OMAP1610_DMA_LCD_TOP_B1_L);
1100         omap_writew(bottom >> 16, OMAP1610_DMA_LCD_BOT_B1_U);
1101         omap_writew(bottom, OMAP1610_DMA_LCD_BOT_B1_L);
1102
1103         omap_writew(en, OMAP1610_DMA_LCD_SRC_EN_B1);
1104         omap_writew(fn, OMAP1610_DMA_LCD_SRC_FN_B1);
1105
1106         w = omap_readw(OMAP1610_DMA_LCD_CSDP);
1107         w &= ~0x03;
1108         w |= lcd_dma.data_type;
1109         omap_writew(w, OMAP1610_DMA_LCD_CSDP);
1110
1111         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1112         /* Always set the source port as SDRAM for now*/
1113         w &= ~(0x03 << 6);
1114         if (lcd_dma.callback != NULL)
1115                 w |= 1 << 1;            /* Block interrupt enable */
1116         else
1117                 w &= ~(1 << 1);
1118         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1119
1120         if (!(lcd_dma.rotate || lcd_dma.mirror ||
1121               lcd_dma.vxres || lcd_dma.xscale || lcd_dma.yscale))
1122                 return;
1123
1124         w = omap_readw(OMAP1610_DMA_LCD_CCR);
1125         /* Set the double-indexed addressing mode */
1126         w |= (0x03 << 12);
1127         omap_writew(w, OMAP1610_DMA_LCD_CCR);
1128
1129         omap_writew(ei, OMAP1610_DMA_LCD_SRC_EI_B1);
1130         omap_writew(fi >> 16, OMAP1610_DMA_LCD_SRC_FI_B1_U);
1131         omap_writew(fi, OMAP1610_DMA_LCD_SRC_FI_B1_L);
1132 }
1133
1134 static irqreturn_t lcd_dma_irq_handler(int irq, void *dev_id,
1135                                        struct pt_regs *regs)
1136 {
1137         u16 w;
1138
1139         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1140         if (unlikely(!(w & (1 << 3)))) {
1141                 printk(KERN_WARNING "Spurious LCD DMA IRQ\n");
1142                 return IRQ_NONE;
1143         }
1144         /* Ack the IRQ */
1145         w |= (1 << 3);
1146         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1147         lcd_dma.active = 0;
1148         if (lcd_dma.callback != NULL)
1149                 lcd_dma.callback(w, lcd_dma.cb_data);
1150
1151         return IRQ_HANDLED;
1152 }
1153
1154 int omap_request_lcd_dma(void (* callback)(u16 status, void *data),
1155                          void *data)
1156 {
1157         spin_lock_irq(&lcd_dma.lock);
1158         if (lcd_dma.reserved) {
1159                 spin_unlock_irq(&lcd_dma.lock);
1160                 printk(KERN_ERR "LCD DMA channel already reserved\n");
1161                 BUG();
1162                 return -EBUSY;
1163         }
1164         lcd_dma.reserved = 1;
1165         spin_unlock_irq(&lcd_dma.lock);
1166         lcd_dma.callback = callback;
1167         lcd_dma.cb_data = data;
1168         lcd_dma.active = 0;
1169         lcd_dma.single_transfer = 0;
1170         lcd_dma.rotate = 0;
1171         lcd_dma.vxres = 0;
1172         lcd_dma.mirror = 0;
1173         lcd_dma.xscale = 0;
1174         lcd_dma.yscale = 0;
1175         lcd_dma.ext_ctrl = 0;
1176         lcd_dma.src_port = 0;
1177
1178         return 0;
1179 }
1180
1181 void omap_free_lcd_dma(void)
1182 {
1183         spin_lock(&lcd_dma.lock);
1184         if (!lcd_dma.reserved) {
1185                 spin_unlock(&lcd_dma.lock);
1186                 printk(KERN_ERR "LCD DMA is not reserved\n");
1187                 BUG();
1188                 return;
1189         }
1190         if (!enable_1510_mode)
1191                 omap_writew(omap_readw(OMAP1610_DMA_LCD_CCR) & ~1,
1192                             OMAP1610_DMA_LCD_CCR);
1193         lcd_dma.reserved = 0;
1194         spin_unlock(&lcd_dma.lock);
1195 }
1196
1197 void omap_enable_lcd_dma(void)
1198 {
1199         u16 w;
1200
1201         /* Set the Enable bit only if an external controller is
1202          * connected. Otherwise the OMAP internal controller will
1203          * start the transfer when it gets enabled.
1204          */
1205         if (enable_1510_mode || !lcd_dma.ext_ctrl)
1206                 return;
1207
1208         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1209         w |= 1 << 8;
1210         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1211
1212         lcd_dma.active = 1;
1213
1214         w = omap_readw(OMAP1610_DMA_LCD_CCR);
1215         w |= 1 << 7;
1216         omap_writew(w, OMAP1610_DMA_LCD_CCR);
1217 }
1218
1219 void omap_setup_lcd_dma(void)
1220 {
1221         BUG_ON(lcd_dma.active);
1222         if (!enable_1510_mode) {
1223                 /* Set some reasonable defaults */
1224                 omap_writew(0x5440, OMAP1610_DMA_LCD_CCR);
1225                 omap_writew(0x9102, OMAP1610_DMA_LCD_CSDP);
1226                 omap_writew(0x0004, OMAP1610_DMA_LCD_LCH_CTRL);
1227         }
1228         set_b1_regs();
1229         if (!enable_1510_mode) {
1230                 u16 w;
1231
1232                 w = omap_readw(OMAP1610_DMA_LCD_CCR);
1233                 /* If DMA was already active set the end_prog bit to have
1234                  * the programmed register set loaded into the active
1235                  * register set.
1236                  */
1237                 w |= 1 << 11;           /* End_prog */
1238                 if (!lcd_dma.single_transfer)
1239                         w |= (3 << 8);  /* Auto_init, repeat */
1240                 omap_writew(w, OMAP1610_DMA_LCD_CCR);
1241         }
1242 }
1243
1244 void omap_stop_lcd_dma(void)
1245 {
1246         u16 w;
1247
1248         lcd_dma.active = 0;
1249         if (enable_1510_mode || !lcd_dma.ext_ctrl)
1250                 return;
1251
1252         w = omap_readw(OMAP1610_DMA_LCD_CCR);
1253         w &= ~(1 << 7);
1254         omap_writew(w, OMAP1610_DMA_LCD_CCR);
1255
1256         w = omap_readw(OMAP1610_DMA_LCD_CTRL);
1257         w &= ~(1 << 8);
1258         omap_writew(w, OMAP1610_DMA_LCD_CTRL);
1259 }
1260
1261 /*----------------------------------------------------------------------------*/
1262
1263 static int __init omap_init_dma(void)
1264 {
1265         int ch, r;
1266
1267         if (cpu_is_omap15xx()) {
1268                 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
1269                 dma_chan_count = 9;
1270                 enable_1510_mode = 1;
1271         } else if (cpu_is_omap16xx() || cpu_is_omap730()) {
1272                 printk(KERN_INFO "OMAP DMA hardware version %d\n",
1273                        omap_readw(OMAP_DMA_HW_ID));
1274                 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
1275                        (omap_readw(OMAP_DMA_CAPS_0_U) << 16) |
1276                        omap_readw(OMAP_DMA_CAPS_0_L),
1277                        (omap_readw(OMAP_DMA_CAPS_1_U) << 16) |
1278                        omap_readw(OMAP_DMA_CAPS_1_L),
1279                        omap_readw(OMAP_DMA_CAPS_2), omap_readw(OMAP_DMA_CAPS_3),
1280                        omap_readw(OMAP_DMA_CAPS_4));
1281                 if (!enable_1510_mode) {
1282                         u16 w;
1283
1284                         /* Disable OMAP 3.0/3.1 compatibility mode. */
1285                         w = omap_readw(OMAP_DMA_GSCR);
1286                         w |= 1 << 3;
1287                         omap_writew(w, OMAP_DMA_GSCR);
1288                         dma_chan_count = 16;
1289                 } else
1290                         dma_chan_count = 9;
1291         } else if (cpu_is_omap24xx()) {
1292                 u8 revision = omap_readb(OMAP_DMA4_REVISION);
1293                 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
1294                        revision >> 4, revision & 0xf);
1295                 dma_chan_count = OMAP_LOGICAL_DMA_CH_COUNT;
1296         } else {
1297                 dma_chan_count = 0;
1298                 return 0;
1299         }
1300
1301         memset(&lcd_dma, 0, sizeof(lcd_dma));
1302         spin_lock_init(&lcd_dma.lock);
1303         spin_lock_init(&dma_chan_lock);
1304         memset(&dma_chan, 0, sizeof(dma_chan));
1305
1306         for (ch = 0; ch < dma_chan_count; ch++) {
1307                 omap_clear_dma(ch);
1308                 dma_chan[ch].dev_id = -1;
1309                 dma_chan[ch].next_lch = -1;
1310
1311                 if (ch >= 6 && enable_1510_mode)
1312                         continue;
1313
1314                 if (cpu_class_is_omap1()) {
1315                         /* request_irq() doesn't like dev_id (ie. ch) being
1316                          * zero, so we have to kludge around this. */
1317                         r = request_irq(omap1_dma_irq[ch],
1318                                         omap1_dma_irq_handler, 0, "DMA",
1319                                         (void *) (ch + 1));
1320                         if (r != 0) {
1321                                 int i;
1322
1323                                 printk(KERN_ERR "unable to request IRQ %d "
1324                                        "for DMA (error %d)\n",
1325                                        omap1_dma_irq[ch], r);
1326                                 for (i = 0; i < ch; i++)
1327                                         free_irq(omap1_dma_irq[i],
1328                                                  (void *) (i + 1));
1329                                 return r;
1330                         }
1331                 }
1332         }
1333
1334         if (cpu_is_omap24xx())
1335                 setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);
1336
1337         /* FIXME: Update LCD DMA to work on 24xx */
1338         if (cpu_class_is_omap1()) {
1339                 r = request_irq(INT_DMA_LCD, lcd_dma_irq_handler, 0,
1340                                 "LCD DMA", NULL);
1341                 if (r != 0) {
1342                         int i;
1343
1344                         printk(KERN_ERR "unable to request IRQ for LCD DMA "
1345                                "(error %d)\n", r);
1346                         for (i = 0; i < dma_chan_count; i++)
1347                                 free_irq(omap1_dma_irq[i], (void *) (i + 1));
1348                         return r;
1349                 }
1350         }
1351
1352         return 0;
1353 }
1354
1355 arch_initcall(omap_init_dma);
1356
1357 EXPORT_SYMBOL(omap_get_dma_src_pos);
1358 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1359 EXPORT_SYMBOL(omap_get_dma_src_addr_counter);
1360 EXPORT_SYMBOL(omap_clear_dma);
1361 EXPORT_SYMBOL(omap_set_dma_priority);
1362 EXPORT_SYMBOL(omap_request_dma);
1363 EXPORT_SYMBOL(omap_free_dma);
1364 EXPORT_SYMBOL(omap_start_dma);
1365 EXPORT_SYMBOL(omap_stop_dma);
1366 EXPORT_SYMBOL(omap_enable_dma_irq);
1367 EXPORT_SYMBOL(omap_disable_dma_irq);
1368
1369 EXPORT_SYMBOL(omap_set_dma_transfer_params);
1370 EXPORT_SYMBOL(omap_set_dma_color_mode);
1371
1372 EXPORT_SYMBOL(omap_set_dma_src_params);
1373 EXPORT_SYMBOL(omap_set_dma_src_index);
1374 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
1375 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
1376
1377 EXPORT_SYMBOL(omap_set_dma_dest_params);
1378 EXPORT_SYMBOL(omap_set_dma_dest_index);
1379 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
1380 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
1381
1382 EXPORT_SYMBOL(omap_set_dma_params);
1383
1384 EXPORT_SYMBOL(omap_dma_link_lch);
1385 EXPORT_SYMBOL(omap_dma_unlink_lch);
1386
1387 EXPORT_SYMBOL(omap_request_lcd_dma);
1388 EXPORT_SYMBOL(omap_free_lcd_dma);
1389 EXPORT_SYMBOL(omap_enable_lcd_dma);
1390 EXPORT_SYMBOL(omap_setup_lcd_dma);
1391 EXPORT_SYMBOL(omap_stop_lcd_dma);
1392 EXPORT_SYMBOL(omap_set_lcd_dma_b1);
1393 EXPORT_SYMBOL(omap_set_lcd_dma_single_transfer);
1394 EXPORT_SYMBOL(omap_set_lcd_dma_ext_controller);
1395 EXPORT_SYMBOL(omap_set_lcd_dma_b1_rotation);
1396 EXPORT_SYMBOL(omap_set_lcd_dma_b1_vxres);
1397 EXPORT_SYMBOL(omap_set_lcd_dma_b1_scale);
1398 EXPORT_SYMBOL(omap_set_lcd_dma_b1_mirror);
1399