arch/arm/plat-omap/dma.c

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This source file includes following definitions.
omap_dma_in_1510_mode
set_gdma_dev
omap_set_dma_priority
omap_set_dma_priority
omap_set_dma_transfer_params
omap_set_dma_write_mode
omap_set_dma_channel_mode
omap_set_dma_src_params
omap_set_dma_params
omap_set_dma_src_data_pack
omap_set_dma_src_burst_mode
omap_set_dma_dest_params
omap_set_dma_dest_data_pack
omap_set_dma_dest_burst_mode
omap_enable_channel_irq
omap_disable_channel_irq
omap_enable_dma_irq
omap_disable_dma_irq
enable_lnk
disable_lnk
omap2_enable_irq_lch
omap2_disable_irq_lch
omap_request_dma
omap_free_dma
omap_dma_set_global_params
omap_dma_set_prio_lch
omap_clear_dma
omap_start_dma
omap_stop_dma
omap_set_dma_callback
omap_get_dma_src_pos
omap_get_dma_dst_pos
omap_get_dma_active_status
omap_dma_running
omap_dma_link_lch
omap1_dma_handle_ch
omap1_dma_irq_handler
omap2_dma_handle_ch
omap2_dma_irq_handler
omap_dma_global_context_save
omap_dma_global_context_restore
omap_get_plat_info
omap_system_dma_probe
omap_system_dma_remove
omap_system_dma_init
omap_system_dma_exit
omap_dma_cmdline_reserve_ch
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/plat-omap/dma.c
   4  *
   5  * Copyright (C) 2003 - 2008 Nokia Corporation
   6  * Author: Juha Yrjölä <juha.yrjola@nokia.com>
   7  * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
   8  * Graphics DMA and LCD DMA graphics tranformations
   9  * by Imre Deak <imre.deak@nokia.com>
  10  * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
  11  * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
  12  * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
  13  *
  14  * Copyright (C) 2009 Texas Instruments
  15  * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
  16  *
  17  * Support functions for the OMAP internal DMA channels.
  18  *
  19  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
  20  * Converted DMA library into DMA platform driver.
  21  *      - G, Manjunath Kondaiah <manjugk@ti.com>
  22  */
  23 
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/sched.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/errno.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/irq.h>
  31 #include <linux/io.h>
  32 #include <linux/slab.h>
  33 #include <linux/delay.h>
  34 
  35 #include <linux/omap-dma.h>
  36 
  37 #ifdef CONFIG_ARCH_OMAP1
  38 #include <mach/soc.h>
  39 #endif
  40 
  41 /*
  42  * MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
  43  * channels that an instance of the SDMA IP block can support.  Used
  44  * to size arrays.  (The actual maximum on a particular SoC may be less
  45  * than this -- for example, OMAP1 SDMA instances only support 17 logical
  46  * DMA channels.)
  47  */
  48 #define MAX_LOGICAL_DMA_CH_COUNT                32
  49 
  50 #undef DEBUG
  51 
  52 #ifndef CONFIG_ARCH_OMAP1
  53 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
  54         DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
  55 };
  56 
  57 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
  58 #endif
  59 
  60 #define OMAP_DMA_ACTIVE                 0x01
  61 #define OMAP2_DMA_CSR_CLEAR_MASK        0xffffffff
  62 
  63 #define OMAP_FUNC_MUX_ARM_BASE          (0xfffe1000 + 0xec)
  64 
  65 static struct omap_system_dma_plat_info *p;
  66 static struct omap_dma_dev_attr *d;
  67 static void omap_clear_dma(int lch);
  68 static int omap_dma_set_prio_lch(int lch, unsigned char read_prio,
  69                                  unsigned char write_prio);
  70 static int enable_1510_mode;
  71 static u32 errata;
  72 
  73 static struct omap_dma_global_context_registers {
  74         u32 dma_irqenable_l0;
  75         u32 dma_irqenable_l1;
  76         u32 dma_ocp_sysconfig;
  77         u32 dma_gcr;
  78 } omap_dma_global_context;
  79 
  80 struct dma_link_info {
  81         int *linked_dmach_q;
  82         int no_of_lchs_linked;
  83 
  84         int q_count;
  85         int q_tail;
  86         int q_head;
  87 
  88         int chain_state;
  89         int chain_mode;
  90 
  91 };
  92 
  93 static struct dma_link_info *dma_linked_lch;
  94 
  95 #ifndef CONFIG_ARCH_OMAP1
  96 
  97 /* Chain handling macros */
  98 #define OMAP_DMA_CHAIN_QINIT(chain_id)                                  \
  99         do {                                                            \
 100                 dma_linked_lch[chain_id].q_head =                       \
 101                 dma_linked_lch[chain_id].q_tail =                       \
 102                 dma_linked_lch[chain_id].q_count = 0;                   \
 103         } while (0)
 104 #define OMAP_DMA_CHAIN_QFULL(chain_id)                                  \
 105                 (dma_linked_lch[chain_id].no_of_lchs_linked ==          \
 106                 dma_linked_lch[chain_id].q_count)
 107 #define OMAP_DMA_CHAIN_QLAST(chain_id)                                  \
 108         do {                                                            \
 109                 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) ==      \
 110                 dma_linked_lch[chain_id].q_count)                       \
 111         } while (0)
 112 #define OMAP_DMA_CHAIN_QEMPTY(chain_id)                                 \
 113                 (0 == dma_linked_lch[chain_id].q_count)
 114 #define __OMAP_DMA_CHAIN_INCQ(end)                                      \
 115         ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
 116 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id)                               \
 117         do {                                                            \
 118                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
 119                 dma_linked_lch[chain_id].q_count--;                     \
 120         } while (0)
 121 
 122 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id)                               \
 123         do {                                                            \
 124                 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
 125                 dma_linked_lch[chain_id].q_count++; \
 126         } while (0)
 127 #endif
 128 
 129 static int dma_lch_count;
 130 static int dma_chan_count;
 131 static int omap_dma_reserve_channels;
 132 
 133 static spinlock_t dma_chan_lock;
 134 static struct omap_dma_lch *dma_chan;
 135 
 136 static inline void disable_lnk(int lch);
 137 static void omap_disable_channel_irq(int lch);
 138 static inline void omap_enable_channel_irq(int lch);
 139 
 140 #define REVISIT_24XX()          printk(KERN_ERR "FIXME: no %s on 24xx\n", \
 141                                                 __func__);
 142 
 143 #ifdef CONFIG_ARCH_OMAP15XX
 144 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
 145 static int omap_dma_in_1510_mode(void)
 146 {
 147         return enable_1510_mode;
 148 }
 149 #else
 150 #define omap_dma_in_1510_mode()         0
 151 #endif
 152 
 153 #ifdef CONFIG_ARCH_OMAP1
 154 static inline void set_gdma_dev(int req, int dev)
 155 {
 156         u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
 157         int shift = ((req - 1) % 5) * 6;
 158         u32 l;
 159 
 160         l = omap_readl(reg);
 161         l &= ~(0x3f << shift);
 162         l |= (dev - 1) << shift;
 163         omap_writel(l, reg);
 164 }
 165 #else
 166 #define set_gdma_dev(req, dev)  do {} while (0)
 167 #define omap_readl(reg)         0
 168 #define omap_writel(val, reg)   do {} while (0)
 169 #endif
 170 
 171 #ifdef CONFIG_ARCH_OMAP1
 172 void omap_set_dma_priority(int lch, int dst_port, int priority)
 173 {
 174         unsigned long reg;
 175         u32 l;
 176 
 177         if (dma_omap1()) {
 178                 switch (dst_port) {
 179                 case OMAP_DMA_PORT_OCP_T1:      /* FFFECC00 */
 180                         reg = OMAP_TC_OCPT1_PRIOR;
 181                         break;
 182                 case OMAP_DMA_PORT_OCP_T2:      /* FFFECCD0 */
 183                         reg = OMAP_TC_OCPT2_PRIOR;
 184                         break;
 185                 case OMAP_DMA_PORT_EMIFF:       /* FFFECC08 */
 186                         reg = OMAP_TC_EMIFF_PRIOR;
 187                         break;
 188                 case OMAP_DMA_PORT_EMIFS:       /* FFFECC04 */
 189                         reg = OMAP_TC_EMIFS_PRIOR;
 190                         break;
 191                 default:
 192                         BUG();
 193                         return;
 194                 }
 195                 l = omap_readl(reg);
 196                 l &= ~(0xf << 8);
 197                 l |= (priority & 0xf) << 8;
 198                 omap_writel(l, reg);
 199         }
 200 }
 201 #endif
 202 
 203 #ifdef CONFIG_ARCH_OMAP2PLUS
 204 void omap_set_dma_priority(int lch, int dst_port, int priority)
 205 {
 206         u32 ccr;
 207 
 208         ccr = p->dma_read(CCR, lch);
 209         if (priority)
 210                 ccr |= (1 << 6);
 211         else
 212                 ccr &= ~(1 << 6);
 213         p->dma_write(ccr, CCR, lch);
 214 }
 215 #endif
 216 EXPORT_SYMBOL(omap_set_dma_priority);
 217 
 218 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
 219                                   int frame_count, int sync_mode,
 220                                   int dma_trigger, int src_or_dst_synch)
 221 {
 222         u32 l;
 223 
 224         l = p->dma_read(CSDP, lch);
 225         l &= ~0x03;
 226         l |= data_type;
 227         p->dma_write(l, CSDP, lch);
 228 
 229         if (dma_omap1()) {
 230                 u16 ccr;
 231 
 232                 ccr = p->dma_read(CCR, lch);
 233                 ccr &= ~(1 << 5);
 234                 if (sync_mode == OMAP_DMA_SYNC_FRAME)
 235                         ccr |= 1 << 5;
 236                 p->dma_write(ccr, CCR, lch);
 237 
 238                 ccr = p->dma_read(CCR2, lch);
 239                 ccr &= ~(1 << 2);
 240                 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
 241                         ccr |= 1 << 2;
 242                 p->dma_write(ccr, CCR2, lch);
 243         }
 244 
 245         if (dma_omap2plus() && dma_trigger) {
 246                 u32 val;
 247 
 248                 val = p->dma_read(CCR, lch);
 249 
 250                 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
 251                 val &= ~((1 << 23) | (3 << 19) | 0x1f);
 252                 val |= (dma_trigger & ~0x1f) << 14;
 253                 val |= dma_trigger & 0x1f;
 254 
 255                 if (sync_mode & OMAP_DMA_SYNC_FRAME)
 256                         val |= 1 << 5;
 257                 else
 258                         val &= ~(1 << 5);
 259 
 260                 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
 261                         val |= 1 << 18;
 262                 else
 263                         val &= ~(1 << 18);
 264 
 265                 if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
 266                         val &= ~(1 << 24);      /* dest synch */
 267                         val |= (1 << 23);       /* Prefetch */
 268                 } else if (src_or_dst_synch) {
 269                         val |= 1 << 24;         /* source synch */
 270                 } else {
 271                         val &= ~(1 << 24);      /* dest synch */
 272                 }
 273                 p->dma_write(val, CCR, lch);
 274         }
 275 
 276         p->dma_write(elem_count, CEN, lch);
 277         p->dma_write(frame_count, CFN, lch);
 278 }
 279 EXPORT_SYMBOL(omap_set_dma_transfer_params);
 280 
 281 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
 282 {
 283         if (dma_omap2plus()) {
 284                 u32 csdp;
 285 
 286                 csdp = p->dma_read(CSDP, lch);
 287                 csdp &= ~(0x3 << 16);
 288                 csdp |= (mode << 16);
 289                 p->dma_write(csdp, CSDP, lch);
 290         }
 291 }
 292 EXPORT_SYMBOL(omap_set_dma_write_mode);
 293 
 294 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
 295 {
 296         if (dma_omap1() && !dma_omap15xx()) {
 297                 u32 l;
 298 
 299                 l = p->dma_read(LCH_CTRL, lch);
 300                 l &= ~0x7;
 301                 l |= mode;
 302                 p->dma_write(l, LCH_CTRL, lch);
 303         }
 304 }
 305 EXPORT_SYMBOL(omap_set_dma_channel_mode);
 306 
 307 /* Note that src_port is only for omap1 */
 308 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
 309                              unsigned long src_start,
 310                              int src_ei, int src_fi)
 311 {
 312         u32 l;
 313 
 314         if (dma_omap1()) {
 315                 u16 w;
 316 
 317                 w = p->dma_read(CSDP, lch);
 318                 w &= ~(0x1f << 2);
 319                 w |= src_port << 2;
 320                 p->dma_write(w, CSDP, lch);
 321         }
 322 
 323         l = p->dma_read(CCR, lch);
 324         l &= ~(0x03 << 12);
 325         l |= src_amode << 12;
 326         p->dma_write(l, CCR, lch);
 327 
 328         p->dma_write(src_start, CSSA, lch);
 329 
 330         p->dma_write(src_ei, CSEI, lch);
 331         p->dma_write(src_fi, CSFI, lch);
 332 }
 333 EXPORT_SYMBOL(omap_set_dma_src_params);
 334 
 335 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
 336 {
 337         omap_set_dma_transfer_params(lch, params->data_type,
 338                                      params->elem_count, params->frame_count,
 339                                      params->sync_mode, params->trigger,
 340                                      params->src_or_dst_synch);
 341         omap_set_dma_src_params(lch, params->src_port,
 342                                 params->src_amode, params->src_start,
 343                                 params->src_ei, params->src_fi);
 344 
 345         omap_set_dma_dest_params(lch, params->dst_port,
 346                                  params->dst_amode, params->dst_start,
 347                                  params->dst_ei, params->dst_fi);
 348         if (params->read_prio || params->write_prio)
 349                 omap_dma_set_prio_lch(lch, params->read_prio,
 350                                       params->write_prio);
 351 }
 352 EXPORT_SYMBOL(omap_set_dma_params);
 353 
 354 void omap_set_dma_src_data_pack(int lch, int enable)
 355 {
 356         u32 l;
 357 
 358         l = p->dma_read(CSDP, lch);
 359         l &= ~(1 << 6);
 360         if (enable)
 361                 l |= (1 << 6);
 362         p->dma_write(l, CSDP, lch);
 363 }
 364 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
 365 
 366 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 367 {
 368         unsigned int burst = 0;
 369         u32 l;
 370 
 371         l = p->dma_read(CSDP, lch);
 372         l &= ~(0x03 << 7);
 373 
 374         switch (burst_mode) {
 375         case OMAP_DMA_DATA_BURST_DIS:
 376                 break;
 377         case OMAP_DMA_DATA_BURST_4:
 378                 if (dma_omap2plus())
 379                         burst = 0x1;
 380                 else
 381                         burst = 0x2;
 382                 break;
 383         case OMAP_DMA_DATA_BURST_8:
 384                 if (dma_omap2plus()) {
 385                         burst = 0x2;
 386                         break;
 387                 }
 388                 /*
 389                  * not supported by current hardware on OMAP1
 390                  * w |= (0x03 << 7);
 391                  */
 392                 /* fall through */
 393         case OMAP_DMA_DATA_BURST_16:
 394                 if (dma_omap2plus()) {
 395                         burst = 0x3;
 396                         break;
 397                 }
 398                 /* OMAP1 don't support burst 16 */
 399                 /* fall through */
 400         default:
 401                 BUG();
 402         }
 403 
 404         l |= (burst << 7);
 405         p->dma_write(l, CSDP, lch);
 406 }
 407 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
 408 
 409 /* Note that dest_port is only for OMAP1 */
 410 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
 411                               unsigned long dest_start,
 412                               int dst_ei, int dst_fi)
 413 {
 414         u32 l;
 415 
 416         if (dma_omap1()) {
 417                 l = p->dma_read(CSDP, lch);
 418                 l &= ~(0x1f << 9);
 419                 l |= dest_port << 9;
 420                 p->dma_write(l, CSDP, lch);
 421         }
 422 
 423         l = p->dma_read(CCR, lch);
 424         l &= ~(0x03 << 14);
 425         l |= dest_amode << 14;
 426         p->dma_write(l, CCR, lch);
 427 
 428         p->dma_write(dest_start, CDSA, lch);
 429 
 430         p->dma_write(dst_ei, CDEI, lch);
 431         p->dma_write(dst_fi, CDFI, lch);
 432 }
 433 EXPORT_SYMBOL(omap_set_dma_dest_params);
 434 
 435 void omap_set_dma_dest_data_pack(int lch, int enable)
 436 {
 437         u32 l;
 438 
 439         l = p->dma_read(CSDP, lch);
 440         l &= ~(1 << 13);
 441         if (enable)
 442                 l |= 1 << 13;
 443         p->dma_write(l, CSDP, lch);
 444 }
 445 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
 446 
 447 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
 448 {
 449         unsigned int burst = 0;
 450         u32 l;
 451 
 452         l = p->dma_read(CSDP, lch);
 453         l &= ~(0x03 << 14);
 454 
 455         switch (burst_mode) {
 456         case OMAP_DMA_DATA_BURST_DIS:
 457                 break;
 458         case OMAP_DMA_DATA_BURST_4:
 459                 if (dma_omap2plus())
 460                         burst = 0x1;
 461                 else
 462                         burst = 0x2;
 463                 break;
 464         case OMAP_DMA_DATA_BURST_8:
 465                 if (dma_omap2plus())
 466                         burst = 0x2;
 467                 else
 468                         burst = 0x3;
 469                 break;
 470         case OMAP_DMA_DATA_BURST_16:
 471                 if (dma_omap2plus()) {
 472                         burst = 0x3;
 473                         break;
 474                 }
 475                 /* OMAP1 don't support burst 16 */
 476                 /* fall through */
 477         default:
 478                 printk(KERN_ERR "Invalid DMA burst mode\n");
 479                 BUG();
 480                 return;
 481         }
 482         l |= (burst << 14);
 483         p->dma_write(l, CSDP, lch);
 484 }
 485 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
 486 
 487 static inline void omap_enable_channel_irq(int lch)
 488 {
 489         /* Clear CSR */
 490         if (dma_omap1())
 491                 p->dma_read(CSR, lch);
 492         else
 493                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 494 
 495         /* Enable some nice interrupts. */
 496         p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
 497 }
 498 
 499 static inline void omap_disable_channel_irq(int lch)
 500 {
 501         /* disable channel interrupts */
 502         p->dma_write(0, CICR, lch);
 503         /* Clear CSR */
 504         if (dma_omap1())
 505                 p->dma_read(CSR, lch);
 506         else
 507                 p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
 508 }
 509 
 510 void omap_enable_dma_irq(int lch, u16 bits)
 511 {
 512         dma_chan[lch].enabled_irqs |= bits;
 513 }
 514 EXPORT_SYMBOL(omap_enable_dma_irq);
 515 
 516 void omap_disable_dma_irq(int lch, u16 bits)
 517 {
 518         dma_chan[lch].enabled_irqs &= ~bits;
 519 }
 520 EXPORT_SYMBOL(omap_disable_dma_irq);
 521 
 522 static inline void enable_lnk(int lch)
 523 {
 524         u32 l;
 525 
 526         l = p->dma_read(CLNK_CTRL, lch);
 527 
 528         if (dma_omap1())
 529                 l &= ~(1 << 14);
 530 
 531         /* Set the ENABLE_LNK bits */
 532         if (dma_chan[lch].next_lch != -1)
 533                 l = dma_chan[lch].next_lch | (1 << 15);
 534 
 535 #ifndef CONFIG_ARCH_OMAP1
 536         if (dma_omap2plus())
 537                 if (dma_chan[lch].next_linked_ch != -1)
 538                         l = dma_chan[lch].next_linked_ch | (1 << 15);
 539 #endif
 540 
 541         p->dma_write(l, CLNK_CTRL, lch);
 542 }
 543 
 544 static inline void disable_lnk(int lch)
 545 {
 546         u32 l;
 547 
 548         l = p->dma_read(CLNK_CTRL, lch);
 549 
 550         /* Disable interrupts */
 551         omap_disable_channel_irq(lch);
 552 
 553         if (dma_omap1()) {
 554                 /* Set the STOP_LNK bit */
 555                 l |= 1 << 14;
 556         }
 557 
 558         if (dma_omap2plus()) {
 559                 /* Clear the ENABLE_LNK bit */
 560                 l &= ~(1 << 15);
 561         }
 562 
 563         p->dma_write(l, CLNK_CTRL, lch);
 564         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 565 }
 566 
 567 static inline void omap2_enable_irq_lch(int lch)
 568 {
 569         u32 val;
 570         unsigned long flags;
 571 
 572         if (dma_omap1())
 573                 return;
 574 
 575         spin_lock_irqsave(&dma_chan_lock, flags);
 576         /* clear IRQ STATUS */
 577         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 578         /* Enable interrupt */
 579         val = p->dma_read(IRQENABLE_L0, lch);
 580         val |= 1 << lch;
 581         p->dma_write(val, IRQENABLE_L0, lch);
 582         spin_unlock_irqrestore(&dma_chan_lock, flags);
 583 }
 584 
 585 static inline void omap2_disable_irq_lch(int lch)
 586 {
 587         u32 val;
 588         unsigned long flags;
 589 
 590         if (dma_omap1())
 591                 return;
 592 
 593         spin_lock_irqsave(&dma_chan_lock, flags);
 594         /* Disable interrupt */
 595         val = p->dma_read(IRQENABLE_L0, lch);
 596         val &= ~(1 << lch);
 597         p->dma_write(val, IRQENABLE_L0, lch);
 598         /* clear IRQ STATUS */
 599         p->dma_write(1 << lch, IRQSTATUS_L0, lch);
 600         spin_unlock_irqrestore(&dma_chan_lock, flags);
 601 }
 602 
 603 int omap_request_dma(int dev_id, const char *dev_name,
 604                      void (*callback)(int lch, u16 ch_status, void *data),
 605                      void *data, int *dma_ch_out)
 606 {
 607         int ch, free_ch = -1;
 608         unsigned long flags;
 609         struct omap_dma_lch *chan;
 610 
 611         WARN(strcmp(dev_name, "DMA engine"), "Using deprecated platform DMA API - please update to DMA engine");
 612 
 613         spin_lock_irqsave(&dma_chan_lock, flags);
 614         for (ch = 0; ch < dma_chan_count; ch++) {
 615                 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
 616                         free_ch = ch;
 617                         /* Exit after first free channel found */
 618                         break;
 619                 }
 620         }
 621         if (free_ch == -1) {
 622                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 623                 return -EBUSY;
 624         }
 625         chan = dma_chan + free_ch;
 626         chan->dev_id = dev_id;
 627 
 628         if (p->clear_lch_regs)
 629                 p->clear_lch_regs(free_ch);
 630 
 631         if (dma_omap2plus())
 632                 omap_clear_dma(free_ch);
 633 
 634         spin_unlock_irqrestore(&dma_chan_lock, flags);
 635 
 636         chan->dev_name = dev_name;
 637         chan->callback = callback;
 638         chan->data = data;
 639         chan->flags = 0;
 640 
 641 #ifndef CONFIG_ARCH_OMAP1
 642         if (dma_omap2plus()) {
 643                 chan->chain_id = -1;
 644                 chan->next_linked_ch = -1;
 645         }
 646 #endif
 647 
 648         chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
 649 
 650         if (dma_omap1())
 651                 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
 652         else if (dma_omap2plus())
 653                 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
 654                         OMAP2_DMA_TRANS_ERR_IRQ;
 655 
 656         if (dma_omap16xx()) {
 657                 /* If the sync device is set, configure it dynamically. */
 658                 if (dev_id != 0) {
 659                         set_gdma_dev(free_ch + 1, dev_id);
 660                         dev_id = free_ch + 1;
 661                 }
 662                 /*
 663                  * Disable the 1510 compatibility mode and set the sync device
 664                  * id.
 665                  */
 666                 p->dma_write(dev_id | (1 << 10), CCR, free_ch);
 667         } else if (dma_omap1()) {
 668                 p->dma_write(dev_id, CCR, free_ch);
 669         }
 670 
 671         if (dma_omap2plus()) {
 672                 omap_enable_channel_irq(free_ch);
 673                 omap2_enable_irq_lch(free_ch);
 674         }
 675 
 676         *dma_ch_out = free_ch;
 677 
 678         return 0;
 679 }
 680 EXPORT_SYMBOL(omap_request_dma);
 681 
 682 void omap_free_dma(int lch)
 683 {
 684         unsigned long flags;
 685 
 686         if (dma_chan[lch].dev_id == -1) {
 687                 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
 688                        lch);
 689                 return;
 690         }
 691 
 692         /* Disable interrupt for logical channel */
 693         if (dma_omap2plus())
 694                 omap2_disable_irq_lch(lch);
 695 
 696         /* Disable all DMA interrupts for the channel. */
 697         omap_disable_channel_irq(lch);
 698 
 699         /* Make sure the DMA transfer is stopped. */
 700         p->dma_write(0, CCR, lch);
 701 
 702         /* Clear registers */
 703         if (dma_omap2plus())
 704                 omap_clear_dma(lch);
 705 
 706         spin_lock_irqsave(&dma_chan_lock, flags);
 707         dma_chan[lch].dev_id = -1;
 708         dma_chan[lch].next_lch = -1;
 709         dma_chan[lch].callback = NULL;
 710         spin_unlock_irqrestore(&dma_chan_lock, flags);
 711 }
 712 EXPORT_SYMBOL(omap_free_dma);
 713 
 714 /**
 715  * @brief omap_dma_set_global_params : Set global priority settings for dma
 716  *
 717  * @param arb_rate
 718  * @param max_fifo_depth
 719  * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
 720  *                                                 DMA_THREAD_RESERVE_ONET
 721  *                                                 DMA_THREAD_RESERVE_TWOT
 722  *                                                 DMA_THREAD_RESERVE_THREET
 723  */
 724 void
 725 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
 726 {
 727         u32 reg;
 728 
 729         if (dma_omap1()) {
 730                 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
 731                 return;
 732         }
 733 
 734         if (max_fifo_depth == 0)
 735                 max_fifo_depth = 1;
 736         if (arb_rate == 0)
 737                 arb_rate = 1;
 738 
 739         reg = 0xff & max_fifo_depth;
 740         reg |= (0x3 & tparams) << 12;
 741         reg |= (arb_rate & 0xff) << 16;
 742 
 743         p->dma_write(reg, GCR, 0);
 744 }
 745 EXPORT_SYMBOL(omap_dma_set_global_params);
 746 
 747 /**
 748  * @brief omap_dma_set_prio_lch : Set channel wise priority settings
 749  *
 750  * @param lch
 751  * @param read_prio - Read priority
 752  * @param write_prio - Write priority
 753  * Both of the above can be set with one of the following values :
 754  *      DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
 755  */
 756 static int
 757 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
 758                       unsigned char write_prio)
 759 {
 760         u32 l;
 761 
 762         if (unlikely((lch < 0 || lch >= dma_lch_count))) {
 763                 printk(KERN_ERR "Invalid channel id\n");
 764                 return -EINVAL;
 765         }
 766         l = p->dma_read(CCR, lch);
 767         l &= ~((1 << 6) | (1 << 26));
 768         if (d->dev_caps & IS_RW_PRIORITY)
 769                 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
 770         else
 771                 l |= ((read_prio & 0x1) << 6);
 772 
 773         p->dma_write(l, CCR, lch);
 774 
 775         return 0;
 776 }
 777 
 778 
 779 /*
 780  * Clears any DMA state so the DMA engine is ready to restart with new buffers
 781  * through omap_start_dma(). Any buffers in flight are discarded.
 782  */
 783 static void omap_clear_dma(int lch)
 784 {
 785         unsigned long flags;
 786 
 787         local_irq_save(flags);
 788         p->clear_dma(lch);
 789         local_irq_restore(flags);
 790 }
 791 
 792 void omap_start_dma(int lch)
 793 {
 794         u32 l;
 795 
 796         /*
 797          * The CPC/CDAC register needs to be initialized to zero
 798          * before starting dma transfer.
 799          */
 800         if (dma_omap15xx())
 801                 p->dma_write(0, CPC, lch);
 802         else
 803                 p->dma_write(0, CDAC, lch);
 804 
 805         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 806                 int next_lch, cur_lch;
 807                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 808 
 809                 /* Set the link register of the first channel */
 810                 enable_lnk(lch);
 811 
 812                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 813                 dma_chan_link_map[lch] = 1;
 814 
 815                 cur_lch = dma_chan[lch].next_lch;
 816                 do {
 817                         next_lch = dma_chan[cur_lch].next_lch;
 818 
 819                         /* The loop case: we've been here already */
 820                         if (dma_chan_link_map[cur_lch])
 821                                 break;
 822                         /* Mark the current channel */
 823                         dma_chan_link_map[cur_lch] = 1;
 824 
 825                         enable_lnk(cur_lch);
 826                         omap_enable_channel_irq(cur_lch);
 827 
 828                         cur_lch = next_lch;
 829                 } while (next_lch != -1);
 830         } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
 831                 p->dma_write(lch, CLNK_CTRL, lch);
 832 
 833         omap_enable_channel_irq(lch);
 834 
 835         l = p->dma_read(CCR, lch);
 836 
 837         if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
 838                         l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
 839         l |= OMAP_DMA_CCR_EN;
 840 
 841         /*
 842          * As dma_write() uses IO accessors which are weakly ordered, there
 843          * is no guarantee that data in coherent DMA memory will be visible
 844          * to the DMA device.  Add a memory barrier here to ensure that any
 845          * such data is visible prior to enabling DMA.
 846          */
 847         mb();
 848         p->dma_write(l, CCR, lch);
 849 
 850         dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
 851 }
 852 EXPORT_SYMBOL(omap_start_dma);
 853 
 854 void omap_stop_dma(int lch)
 855 {
 856         u32 l;
 857 
 858         /* Disable all interrupts on the channel */
 859         omap_disable_channel_irq(lch);
 860 
 861         l = p->dma_read(CCR, lch);
 862         if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
 863                         (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
 864                 int i = 0;
 865                 u32 sys_cf;
 866 
 867                 /* Configure No-Standby */
 868                 l = p->dma_read(OCP_SYSCONFIG, lch);
 869                 sys_cf = l;
 870                 l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
 871                 l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
 872                 p->dma_write(l , OCP_SYSCONFIG, 0);
 873 
 874                 l = p->dma_read(CCR, lch);
 875                 l &= ~OMAP_DMA_CCR_EN;
 876                 p->dma_write(l, CCR, lch);
 877 
 878                 /* Wait for sDMA FIFO drain */
 879                 l = p->dma_read(CCR, lch);
 880                 while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
 881                                         OMAP_DMA_CCR_WR_ACTIVE))) {
 882                         udelay(5);
 883                         i++;
 884                         l = p->dma_read(CCR, lch);
 885                 }
 886                 if (i >= 100)
 887                         pr_err("DMA drain did not complete on lch %d\n", lch);
 888                 /* Restore OCP_SYSCONFIG */
 889                 p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
 890         } else {
 891                 l &= ~OMAP_DMA_CCR_EN;
 892                 p->dma_write(l, CCR, lch);
 893         }
 894 
 895         /*
 896          * Ensure that data transferred by DMA is visible to any access
 897          * after DMA has been disabled.  This is important for coherent
 898          * DMA regions.
 899          */
 900         mb();
 901 
 902         if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
 903                 int next_lch, cur_lch = lch;
 904                 char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
 905 
 906                 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
 907                 do {
 908                         /* The loop case: we've been here already */
 909                         if (dma_chan_link_map[cur_lch])
 910                                 break;
 911                         /* Mark the current channel */
 912                         dma_chan_link_map[cur_lch] = 1;
 913 
 914                         disable_lnk(cur_lch);
 915 
 916                         next_lch = dma_chan[cur_lch].next_lch;
 917                         cur_lch = next_lch;
 918                 } while (next_lch != -1);
 919         }
 920 
 921         dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
 922 }
 923 EXPORT_SYMBOL(omap_stop_dma);
 924 
 925 /*
 926  * Allows changing the DMA callback function or data. This may be needed if
 927  * the driver shares a single DMA channel for multiple dma triggers.
 928  */
 929 int omap_set_dma_callback(int lch,
 930                           void (*callback)(int lch, u16 ch_status, void *data),
 931                           void *data)
 932 {
 933         unsigned long flags;
 934 
 935         if (lch < 0)
 936                 return -ENODEV;
 937 
 938         spin_lock_irqsave(&dma_chan_lock, flags);
 939         if (dma_chan[lch].dev_id == -1) {
 940                 printk(KERN_ERR "DMA callback for not set for free channel\n");
 941                 spin_unlock_irqrestore(&dma_chan_lock, flags);
 942                 return -EINVAL;
 943         }
 944         dma_chan[lch].callback = callback;
 945         dma_chan[lch].data = data;
 946         spin_unlock_irqrestore(&dma_chan_lock, flags);
 947 
 948         return 0;
 949 }
 950 EXPORT_SYMBOL(omap_set_dma_callback);
 951 
 952 /*
 953  * Returns current physical source address for the given DMA channel.
 954  * If the channel is running the caller must disable interrupts prior calling
 955  * this function and process the returned value before re-enabling interrupt to
 956  * prevent races with the interrupt handler. Note that in continuous mode there
 957  * is a chance for CSSA_L register overflow between the two reads resulting
 958  * in incorrect return value.
 959  */
 960 dma_addr_t omap_get_dma_src_pos(int lch)
 961 {
 962         dma_addr_t offset = 0;
 963 
 964         if (dma_omap15xx())
 965                 offset = p->dma_read(CPC, lch);
 966         else
 967                 offset = p->dma_read(CSAC, lch);
 968 
 969         if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
 970                 offset = p->dma_read(CSAC, lch);
 971 
 972         if (!dma_omap15xx()) {
 973                 /*
 974                  * CDAC == 0 indicates that the DMA transfer on the channel has
 975                  * not been started (no data has been transferred so far).
 976                  * Return the programmed source start address in this case.
 977                  */
 978                 if (likely(p->dma_read(CDAC, lch)))
 979                         offset = p->dma_read(CSAC, lch);
 980                 else
 981                         offset = p->dma_read(CSSA, lch);
 982         }
 983 
 984         if (dma_omap1())
 985                 offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
 986 
 987         return offset;
 988 }
 989 EXPORT_SYMBOL(omap_get_dma_src_pos);
 990 
 991 /*
 992  * Returns current physical destination address for the given DMA channel.
 993  * If the channel is running the caller must disable interrupts prior calling
 994  * this function and process the returned value before re-enabling interrupt to
 995  * prevent races with the interrupt handler. Note that in continuous mode there
 996  * is a chance for CDSA_L register overflow between the two reads resulting
 997  * in incorrect return value.
 998  */
 999 dma_addr_t omap_get_dma_dst_pos(int lch)
1000 {
1001         dma_addr_t offset = 0;
1002 
1003         if (dma_omap15xx())
1004                 offset = p->dma_read(CPC, lch);
1005         else
1006                 offset = p->dma_read(CDAC, lch);
1007 
1008         /*
1009          * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1010          * read before the DMA controller finished disabling the channel.
1011          */
1012         if (!dma_omap15xx() && offset == 0) {
1013                 offset = p->dma_read(CDAC, lch);
1014                 /*
1015                  * CDAC == 0 indicates that the DMA transfer on the channel has
1016                  * not been started (no data has been transferred so far).
1017                  * Return the programmed destination start address in this case.
1018                  */
1019                 if (unlikely(!offset))
1020                         offset = p->dma_read(CDSA, lch);
1021         }
1022 
1023         if (dma_omap1())
1024                 offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
1025 
1026         return offset;
1027 }
1028 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1029 
1030 int omap_get_dma_active_status(int lch)
1031 {
1032         return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
1033 }
1034 EXPORT_SYMBOL(omap_get_dma_active_status);
1035 
1036 int omap_dma_running(void)
1037 {
1038         int lch;
1039 
1040         if (dma_omap1())
1041                 if (omap_lcd_dma_running())
1042                         return 1;
1043 
1044         for (lch = 0; lch < dma_chan_count; lch++)
1045                 if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
1046                         return 1;
1047 
1048         return 0;
1049 }
1050 
1051 /*
1052  * lch_queue DMA will start right after lch_head one is finished.
1053  * For this DMA link to start, you still need to start (see omap_start_dma)
1054  * the first one. That will fire up the entire queue.
1055  */
1056 void omap_dma_link_lch(int lch_head, int lch_queue)
1057 {
1058         if (omap_dma_in_1510_mode()) {
1059                 if (lch_head == lch_queue) {
1060                         p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
1061                                                                 CCR, lch_head);
1062                         return;
1063                 }
1064                 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1065                 BUG();
1066                 return;
1067         }
1068 
1069         if ((dma_chan[lch_head].dev_id == -1) ||
1070             (dma_chan[lch_queue].dev_id == -1)) {
1071                 pr_err("omap_dma: trying to link non requested channels\n");
1072                 dump_stack();
1073         }
1074 
1075         dma_chan[lch_head].next_lch = lch_queue;
1076 }
1077 EXPORT_SYMBOL(omap_dma_link_lch);
1078 
1079 /*----------------------------------------------------------------------------*/
1080 
1081 #ifdef CONFIG_ARCH_OMAP1
1082 
1083 static int omap1_dma_handle_ch(int ch)
1084 {
1085         u32 csr;
1086 
1087         if (enable_1510_mode && ch >= 6) {
1088                 csr = dma_chan[ch].saved_csr;
1089                 dma_chan[ch].saved_csr = 0;
1090         } else
1091                 csr = p->dma_read(CSR, ch);
1092         if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1093                 dma_chan[ch + 6].saved_csr = csr >> 7;
1094                 csr &= 0x7f;
1095         }
1096         if ((csr & 0x3f) == 0)
1097                 return 0;
1098         if (unlikely(dma_chan[ch].dev_id == -1)) {
1099                 pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
1100                         ch, csr);
1101                 return 0;
1102         }
1103         if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1104                 pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
1105         if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1106                 pr_warn("DMA synchronization event drop occurred with device %d\n",
1107                         dma_chan[ch].dev_id);
1108         if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1109                 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1110         if (likely(dma_chan[ch].callback != NULL))
1111                 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1112 
1113         return 1;
1114 }
1115 
1116 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1117 {
1118         int ch = ((int) dev_id) - 1;
1119         int handled = 0;
1120 
1121         for (;;) {
1122                 int handled_now = 0;
1123 
1124                 handled_now += omap1_dma_handle_ch(ch);
1125                 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1126                         handled_now += omap1_dma_handle_ch(ch + 6);
1127                 if (!handled_now)
1128                         break;
1129                 handled += handled_now;
1130         }
1131 
1132         return handled ? IRQ_HANDLED : IRQ_NONE;
1133 }
1134 
1135 #else
1136 #define omap1_dma_irq_handler   NULL
1137 #endif
1138 
1139 #ifdef CONFIG_ARCH_OMAP2PLUS
1140 
1141 static int omap2_dma_handle_ch(int ch)
1142 {
1143         u32 status = p->dma_read(CSR, ch);
1144 
1145         if (!status) {
1146                 if (printk_ratelimit())
1147                         pr_warn("Spurious DMA IRQ for lch %d\n", ch);
1148                 p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1149                 return 0;
1150         }
1151         if (unlikely(dma_chan[ch].dev_id == -1)) {
1152                 if (printk_ratelimit())
1153                         pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
1154                                 status, ch);
1155                 return 0;
1156         }
1157         if (unlikely(status & OMAP_DMA_DROP_IRQ))
1158                 pr_info("DMA synchronization event drop occurred with device %d\n",
1159                         dma_chan[ch].dev_id);
1160         if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1161                 printk(KERN_INFO "DMA transaction error with device %d\n",
1162                        dma_chan[ch].dev_id);
1163                 if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
1164                         u32 ccr;
1165 
1166                         ccr = p->dma_read(CCR, ch);
1167                         ccr &= ~OMAP_DMA_CCR_EN;
1168                         p->dma_write(ccr, CCR, ch);
1169                         dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1170                 }
1171         }
1172         if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1173                 printk(KERN_INFO "DMA secure error with device %d\n",
1174                        dma_chan[ch].dev_id);
1175         if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1176                 printk(KERN_INFO "DMA misaligned error with device %d\n",
1177                        dma_chan[ch].dev_id);
1178 
1179         p->dma_write(status, CSR, ch);
1180         p->dma_write(1 << ch, IRQSTATUS_L0, ch);
1181         /* read back the register to flush the write */
1182         p->dma_read(IRQSTATUS_L0, ch);
1183 
1184         /* If the ch is not chained then chain_id will be -1 */
1185         if (dma_chan[ch].chain_id != -1) {
1186                 int chain_id = dma_chan[ch].chain_id;
1187                 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1188                 if (p->dma_read(CLNK_CTRL, ch) & (1 << 15))
1189                         dma_chan[dma_chan[ch].next_linked_ch].state =
1190                                                         DMA_CH_STARTED;
1191                 if (dma_linked_lch[chain_id].chain_mode ==
1192                                                 OMAP_DMA_DYNAMIC_CHAIN)
1193                         disable_lnk(ch);
1194 
1195                 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1196                         OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1197 
1198                 status = p->dma_read(CSR, ch);
1199                 p->dma_write(status, CSR, ch);
1200         }
1201 
1202         if (likely(dma_chan[ch].callback != NULL))
1203                 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1204 
1205         return 0;
1206 }
1207 
1208 /* STATUS register count is from 1-32 while our is 0-31 */
1209 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1210 {
1211         u32 val, enable_reg;
1212         int i;
1213 
1214         val = p->dma_read(IRQSTATUS_L0, 0);
1215         if (val == 0) {
1216                 if (printk_ratelimit())
1217                         printk(KERN_WARNING "Spurious DMA IRQ\n");
1218                 return IRQ_HANDLED;
1219         }
1220         enable_reg = p->dma_read(IRQENABLE_L0, 0);
1221         val &= enable_reg; /* Dispatch only relevant interrupts */
1222         for (i = 0; i < dma_lch_count && val != 0; i++) {
1223                 if (val & 1)
1224                         omap2_dma_handle_ch(i);
1225                 val >>= 1;
1226         }
1227 
1228         return IRQ_HANDLED;
1229 }
1230 
1231 static struct irqaction omap24xx_dma_irq = {
1232         .name = "DMA",
1233         .handler = omap2_dma_irq_handler,
1234 };
1235 
1236 #else
1237 static struct irqaction omap24xx_dma_irq;
1238 #endif
1239 
1240 /*----------------------------------------------------------------------------*/
1241 
1242 /*
1243  * Note that we are currently using only IRQENABLE_L0 and L1.
1244  * As the DSP may be using IRQENABLE_L2 and L3, let's not
1245  * touch those for now.
1246  */
1247 void omap_dma_global_context_save(void)
1248 {
1249         omap_dma_global_context.dma_irqenable_l0 =
1250                 p->dma_read(IRQENABLE_L0, 0);
1251         omap_dma_global_context.dma_irqenable_l1 =
1252                 p->dma_read(IRQENABLE_L1, 0);
1253         omap_dma_global_context.dma_ocp_sysconfig =
1254                 p->dma_read(OCP_SYSCONFIG, 0);
1255         omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
1256 }
1257 
1258 void omap_dma_global_context_restore(void)
1259 {
1260         int ch;
1261 
1262         p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
1263         p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
1264                 OCP_SYSCONFIG, 0);
1265         p->dma_write(omap_dma_global_context.dma_irqenable_l0,
1266                 IRQENABLE_L0, 0);
1267         p->dma_write(omap_dma_global_context.dma_irqenable_l1,
1268                 IRQENABLE_L1, 0);
1269 
1270         if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
1271                 p->dma_write(0x3 , IRQSTATUS_L0, 0);
1272 
1273         for (ch = 0; ch < dma_chan_count; ch++)
1274                 if (dma_chan[ch].dev_id != -1)
1275                         omap_clear_dma(ch);
1276 }
1277 
1278 struct omap_system_dma_plat_info *omap_get_plat_info(void)
1279 {
1280         return p;
1281 }
1282 EXPORT_SYMBOL_GPL(omap_get_plat_info);
1283 
1284 static int omap_system_dma_probe(struct platform_device *pdev)
1285 {
1286         int ch, ret = 0;
1287         int dma_irq;
1288         char irq_name[4];
1289         int irq_rel;
1290 
1291         p = pdev->dev.platform_data;
1292         if (!p) {
1293                 dev_err(&pdev->dev,
1294                         "%s: System DMA initialized without platform data\n",
1295                         __func__);
1296                 return -EINVAL;
1297         }
1298 
1299         d                       = p->dma_attr;
1300         errata                  = p->errata;
1301 
1302         if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
1303                         && (omap_dma_reserve_channels < d->lch_count))
1304                 d->lch_count    = omap_dma_reserve_channels;
1305 
1306         dma_lch_count           = d->lch_count;
1307         dma_chan_count          = dma_lch_count;
1308         enable_1510_mode        = d->dev_caps & ENABLE_1510_MODE;
1309 
1310         dma_chan = devm_kcalloc(&pdev->dev, dma_lch_count,
1311                                 sizeof(*dma_chan), GFP_KERNEL);
1312         if (!dma_chan)
1313                 return -ENOMEM;
1314 
1315         if (dma_omap2plus()) {
1316                 dma_linked_lch = kcalloc(dma_lch_count,
1317                                          sizeof(*dma_linked_lch),
1318                                          GFP_KERNEL);
1319                 if (!dma_linked_lch) {
1320                         ret = -ENOMEM;
1321                         goto exit_dma_lch_fail;
1322                 }
1323         }
1324 
1325         spin_lock_init(&dma_chan_lock);
1326         for (ch = 0; ch < dma_chan_count; ch++) {
1327                 omap_clear_dma(ch);
1328                 if (dma_omap2plus())
1329                         omap2_disable_irq_lch(ch);
1330 
1331                 dma_chan[ch].dev_id = -1;
1332                 dma_chan[ch].next_lch = -1;
1333 
1334                 if (ch >= 6 && enable_1510_mode)
1335                         continue;
1336 
1337                 if (dma_omap1()) {
1338                         /*
1339                          * request_irq() doesn't like dev_id (ie. ch) being
1340                          * zero, so we have to kludge around this.
1341                          */
1342                         sprintf(&irq_name[0], "%d", ch);
1343                         dma_irq = platform_get_irq_byname(pdev, irq_name);
1344 
1345                         if (dma_irq < 0) {
1346                                 ret = dma_irq;
1347                                 goto exit_dma_irq_fail;
1348                         }
1349 
1350                         /* INT_DMA_LCD is handled in lcd_dma.c */
1351                         if (dma_irq == INT_DMA_LCD)
1352                                 continue;
1353 
1354                         ret = request_irq(dma_irq,
1355                                         omap1_dma_irq_handler, 0, "DMA",
1356                                         (void *) (ch + 1));
1357                         if (ret != 0)
1358                                 goto exit_dma_irq_fail;
1359                 }
1360         }
1361 
1362         if (d->dev_caps & IS_RW_PRIORITY)
1363                 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
1364                                 DMA_DEFAULT_FIFO_DEPTH, 0);
1365 
1366         if (dma_omap2plus() && !(d->dev_caps & DMA_ENGINE_HANDLE_IRQ)) {
1367                 strcpy(irq_name, "0");
1368                 dma_irq = platform_get_irq_byname(pdev, irq_name);
1369                 if (dma_irq < 0) {
1370                         dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
1371                         ret = dma_irq;
1372                         goto exit_dma_lch_fail;
1373                 }
1374                 ret = setup_irq(dma_irq, &omap24xx_dma_irq);
1375                 if (ret) {
1376                         dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
1377                                 dma_irq, ret);
1378                         goto exit_dma_lch_fail;
1379                 }
1380         }
1381 
1382         /* reserve dma channels 0 and 1 in high security devices on 34xx */
1383         if (d->dev_caps & HS_CHANNELS_RESERVED) {
1384                 pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
1385                 dma_chan[0].dev_id = 0;
1386                 dma_chan[1].dev_id = 1;
1387         }
1388         p->show_dma_caps();
1389         return 0;
1390 
1391 exit_dma_irq_fail:
1392         dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
1393                 dma_irq, ret);
1394         for (irq_rel = 0; irq_rel < ch; irq_rel++) {
1395                 dma_irq = platform_get_irq(pdev, irq_rel);
1396                 free_irq(dma_irq, (void *)(irq_rel + 1));
1397         }
1398 
1399 exit_dma_lch_fail:
1400         return ret;
1401 }
1402 
1403 static int omap_system_dma_remove(struct platform_device *pdev)
1404 {
1405         int dma_irq;
1406 
1407         if (dma_omap2plus()) {
1408                 char irq_name[4];
1409                 strcpy(irq_name, "0");
1410                 dma_irq = platform_get_irq_byname(pdev, irq_name);
1411                 if (dma_irq >= 0)
1412                         remove_irq(dma_irq, &omap24xx_dma_irq);
1413         } else {
1414                 int irq_rel = 0;
1415                 for ( ; irq_rel < dma_chan_count; irq_rel++) {
1416                         dma_irq = platform_get_irq(pdev, irq_rel);
1417                         free_irq(dma_irq, (void *)(irq_rel + 1));
1418                 }
1419         }
1420         return 0;
1421 }
1422 
1423 static struct platform_driver omap_system_dma_driver = {
1424         .probe          = omap_system_dma_probe,
1425         .remove         = omap_system_dma_remove,
1426         .driver         = {
1427                 .name   = "omap_dma_system"
1428         },
1429 };
1430 
1431 static int __init omap_system_dma_init(void)
1432 {
1433         return platform_driver_register(&omap_system_dma_driver);
1434 }
1435 arch_initcall(omap_system_dma_init);
1436 
1437 static void __exit omap_system_dma_exit(void)
1438 {
1439         platform_driver_unregister(&omap_system_dma_driver);
1440 }
1441 
1442 MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
1443 MODULE_LICENSE("GPL");
1444 MODULE_AUTHOR("Texas Instruments Inc");
1445 
1446 /*
1447  * Reserve the omap SDMA channels using cmdline bootarg
1448  * "omap_dma_reserve_ch=". The valid range is 1 to 32
1449  */
1450 static int __init omap_dma_cmdline_reserve_ch(char *str)
1451 {
1452         if (get_option(&str, &omap_dma_reserve_channels) != 1)
1453                 omap_dma_reserve_channels = 0;
1454         return 1;
1455 }
1456 
1457 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
1458 
1459
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root/arch/arm/plat-omap/dma.c

DEFINITIONS
