drivers/dma/edma.c

   1 /*
   2  * TI EDMA DMA engine driver
   3  *
   4  * Copyright 2012 Texas Instruments
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation version 2.
   9  *
  10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  11  * kind, whether express or implied; without even the implied warranty
  12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/dmaengine.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/edma.h>
  19 #include <linux/err.h>
  20 #include <linux/init.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/list.h>
  23 #include <linux/module.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/slab.h>
  26 #include <linux/spinlock.h>
  27 #include <linux/of.h>
  28 #include <linux/of_dma.h>
  29 #include <linux/of_irq.h>
  30 #include <linux/of_address.h>
  31 #include <linux/of_device.h>
  32 #include <linux/pm_runtime.h>
  33
  34 #include <linux/platform_data/edma.h>
  35
  36 #include "dmaengine.h"
  37 #include "virt-dma.h"
  38
  39 /* Offsets matching "struct edmacc_param" */
  40 #define PARM_OPT                0x00
  41 #define PARM_SRC                0x04
  42 #define PARM_A_B_CNT            0x08
  43 #define PARM_DST                0x0c
  44 #define PARM_SRC_DST_BIDX       0x10
  45 #define PARM_LINK_BCNTRLD       0x14
  46 #define PARM_SRC_DST_CIDX       0x18
  47 #define PARM_CCNT               0x1c
  48
  49 #define PARM_SIZE               0x20
  50
  51 /* Offsets for EDMA CC global channel registers and their shadows */
  52 #define SH_ER                   0x00    /* 64 bits */
  53 #define SH_ECR                  0x08    /* 64 bits */
  54 #define SH_ESR                  0x10    /* 64 bits */
  55 #define SH_CER                  0x18    /* 64 bits */
  56 #define SH_EER                  0x20    /* 64 bits */
  57 #define SH_EECR                 0x28    /* 64 bits */
  58 #define SH_EESR                 0x30    /* 64 bits */
  59 #define SH_SER                  0x38    /* 64 bits */
  60 #define SH_SECR                 0x40    /* 64 bits */
  61 #define SH_IER                  0x50    /* 64 bits */
  62 #define SH_IECR                 0x58    /* 64 bits */
  63 #define SH_IESR                 0x60    /* 64 bits */
  64 #define SH_IPR                  0x68    /* 64 bits */
  65 #define SH_ICR                  0x70    /* 64 bits */
  66 #define SH_IEVAL                0x78
  67 #define SH_QER                  0x80
  68 #define SH_QEER                 0x84
  69 #define SH_QEECR                0x88
  70 #define SH_QEESR                0x8c
  71 #define SH_QSER                 0x90
  72 #define SH_QSECR                0x94
  73 #define SH_SIZE                 0x200
  74
  75 /* Offsets for EDMA CC global registers */
  76 #define EDMA_REV                0x0000
  77 #define EDMA_CCCFG              0x0004
  78 #define EDMA_QCHMAP             0x0200  /* 8 registers */
  79 #define EDMA_DMAQNUM            0x0240  /* 8 registers (4 on OMAP-L1xx) */
  80 #define EDMA_QDMAQNUM           0x0260
  81 #define EDMA_QUETCMAP           0x0280
  82 #define EDMA_QUEPRI             0x0284
  83 #define EDMA_EMR                0x0300  /* 64 bits */
  84 #define EDMA_EMCR               0x0308  /* 64 bits */
  85 #define EDMA_QEMR               0x0310
  86 #define EDMA_QEMCR              0x0314
  87 #define EDMA_CCERR              0x0318
  88 #define EDMA_CCERRCLR           0x031c
  89 #define EDMA_EEVAL              0x0320
  90 #define EDMA_DRAE               0x0340  /* 4 x 64 bits*/
  91 #define EDMA_QRAE               0x0380  /* 4 registers */
  92 #define EDMA_QUEEVTENTRY        0x0400  /* 2 x 16 registers */
  93 #define EDMA_QSTAT              0x0600  /* 2 registers */
  94 #define EDMA_QWMTHRA            0x0620
  95 #define EDMA_QWMTHRB            0x0624
  96 #define EDMA_CCSTAT             0x0640
  97
  98 #define EDMA_M                  0x1000  /* global channel registers */
  99 #define EDMA_ECR                0x1008
 100 #define EDMA_ECRH               0x100C
 101 #define EDMA_SHADOW0            0x2000  /* 4 shadow regions */
 102 #define EDMA_PARM               0x4000  /* PaRAM entries */
 103
 104 #define PARM_OFFSET(param_no)   (EDMA_PARM + ((param_no) << 5))
 105
 106 #define EDMA_DCHMAP             0x0100  /* 64 registers */
 107
 108 /* CCCFG register */
 109 #define GET_NUM_DMACH(x)        (x & 0x7) /* bits 0-2 */
 110 #define GET_NUM_QDMACH(x)       ((x & 0x70) >> 4) /* bits 4-6 */
 111 #define GET_NUM_PAENTRY(x)      ((x & 0x7000) >> 12) /* bits 12-14 */
 112 #define GET_NUM_EVQUE(x)        ((x & 0x70000) >> 16) /* bits 16-18 */
 113 #define GET_NUM_REGN(x)         ((x & 0x300000) >> 20) /* bits 20-21 */
 114 #define CHMAP_EXIST             BIT(24)
 115
 116 /* CCSTAT register */
 117 #define EDMA_CCSTAT_ACTV        BIT(4)
 118
 119 /*
 120  * Max of 20 segments per channel to conserve PaRAM slots
 121  * Also note that MAX_NR_SG should be atleast the no.of periods
 122  * that are required for ASoC, otherwise DMA prep calls will
 123  * fail. Today davinci-pcm is the only user of this driver and
 124  * requires atleast 17 slots, so we setup the default to 20.
 125  */
 126 #define MAX_NR_SG               20
 127 #define EDMA_MAX_SLOTS          MAX_NR_SG
 128 #define EDMA_DESCRIPTORS        16
 129
 130 #define EDMA_CHANNEL_ANY                -1      /* for edma_alloc_channel() */
 131 #define EDMA_SLOT_ANY                   -1      /* for edma_alloc_slot() */
 132 #define EDMA_CONT_PARAMS_ANY             1001
 133 #define EDMA_CONT_PARAMS_FIXED_EXACT     1002
 134 #define EDMA_CONT_PARAMS_FIXED_NOT_EXACT 1003
 135
 136 /* PaRAM slots are laid out like this */
 137 struct edmacc_param {
 138         u32 opt;
 139         u32 src;
 140         u32 a_b_cnt;
 141         u32 dst;
 142         u32 src_dst_bidx;
 143         u32 link_bcntrld;
 144         u32 src_dst_cidx;
 145         u32 ccnt;
 146 } __packed;
 147
 148 /* fields in edmacc_param.opt */
 149 #define SAM             BIT(0)
 150 #define DAM             BIT(1)
 151 #define SYNCDIM         BIT(2)
 152 #define STATIC          BIT(3)
 153 #define EDMA_FWID       (0x07 << 8)
 154 #define TCCMODE         BIT(11)
 155 #define EDMA_TCC(t)     ((t) << 12)
 156 #define TCINTEN         BIT(20)
 157 #define ITCINTEN        BIT(21)
 158 #define TCCHEN          BIT(22)
 159 #define ITCCHEN         BIT(23)
 160
 161 struct edma_pset {
 162         u32                             len;
 163         dma_addr_t                      addr;
 164         struct edmacc_param             param;
 165 };
 166
 167 struct edma_desc {
 168         struct virt_dma_desc            vdesc;
 169         struct list_head                node;
 170         enum dma_transfer_direction     direction;
 171         int                             cyclic;
 172         int                             absync;
 173         int                             pset_nr;
 174         struct edma_chan                *echan;
 175         int                             processed;
 176
 177         /*
 178          * The following 4 elements are used for residue accounting.
 179          *
 180          * - processed_stat: the number of SG elements we have traversed
 181          * so far to cover accounting. This is updated directly to processed
 182          * during edma_callback and is always <= processed, because processed
 183          * refers to the number of pending transfer (programmed to EDMA
 184          * controller), where as processed_stat tracks number of transfers
 185          * accounted for so far.
 186          *
 187          * - residue: The amount of bytes we have left to transfer for this desc
 188          *
 189          * - residue_stat: The residue in bytes of data we have covered
 190          * so far for accounting. This is updated directly to residue
 191          * during callbacks to keep it current.
 192          *
 193          * - sg_len: Tracks the length of the current intermediate transfer,
 194          * this is required to update the residue during intermediate transfer
 195          * completion callback.
 196          */
 197         int                             processed_stat;
 198         u32                             sg_len;
 199         u32                             residue;
 200         u32                             residue_stat;
 201
 202         struct edma_pset                pset[0];
 203 };
 204
 205 struct edma_cc;
 206
 207 struct edma_tc {
 208         struct device_node              *node;
 209         u16                             id;
 210 };
 211
 212 struct edma_chan {
 213         struct virt_dma_chan            vchan;
 214         struct list_head                node;
 215         struct edma_desc                *edesc;
 216         struct edma_cc                  *ecc;
 217         struct edma_tc                  *tc;
 218         int                             ch_num;
 219         bool                            alloced;
 220         bool                            hw_triggered;
 221         int                             slot[EDMA_MAX_SLOTS];
 222         int                             missed;
 223         struct dma_slave_config         cfg;
 224 };
 225
 226 struct edma_cc {
 227         struct device                   *dev;
 228         struct edma_soc_info            *info;
 229         void __iomem                    *base;
 230         int                             id;
 231         bool                            legacy_mode;
 232
 233         /* eDMA3 resource information */
 234         unsigned                        num_channels;
 235         unsigned                        num_qchannels;
 236         unsigned                        num_region;
 237         unsigned                        num_slots;
 238         unsigned                        num_tc;
 239         bool                            chmap_exist;
 240         enum dma_event_q                default_queue;
 241
 242         /*
 243          * The slot_inuse bit for each PaRAM slot is clear unless the slot is
 244          * in use by Linux or if it is allocated to be used by DSP.
 245          */
 246         unsigned long *slot_inuse;
 247
 248         struct dma_device               dma_slave;
 249         struct dma_device               *dma_memcpy;
 250         struct edma_chan                *slave_chans;
 251         struct edma_tc                  *tc_list;
 252         int                             dummy_slot;
 253 };
 254
 255 /* dummy param set used to (re)initialize parameter RAM slots */
 256 static const struct edmacc_param dummy_paramset = {
 257         .link_bcntrld = 0xffff,
 258         .ccnt = 1,
 259 };
 260
 261 #define EDMA_BINDING_LEGACY     0
 262 #define EDMA_BINDING_TPCC       1
 263 static const struct of_device_id edma_of_ids[] = {
 264         {
 265                 .compatible = "ti,edma3",
 266                 .data = (void *)EDMA_BINDING_LEGACY,
 267         },
 268         {
 269                 .compatible = "ti,edma3-tpcc",
 270                 .data = (void *)EDMA_BINDING_TPCC,
 271         },
 272         {}
 273 };
 274
 275 static const struct of_device_id edma_tptc_of_ids[] = {
 276         { .compatible = "ti,edma3-tptc", },
 277         {}
 278 };
 279
 280 static inline unsigned int edma_read(struct edma_cc *ecc, int offset)
 281 {
 282         return (unsigned int)__raw_readl(ecc->base + offset);
 283 }
 284
 285 static inline void edma_write(struct edma_cc *ecc, int offset, int val)
 286 {
 287         __raw_writel(val, ecc->base + offset);
 288 }
 289
 290 static inline void edma_modify(struct edma_cc *ecc, int offset, unsigned and,
 291                                unsigned or)
 292 {
 293         unsigned val = edma_read(ecc, offset);
 294
 295         val &= and;
 296         val |= or;
 297         edma_write(ecc, offset, val);
 298 }
 299
 300 static inline void edma_and(struct edma_cc *ecc, int offset, unsigned and)
 301 {
 302         unsigned val = edma_read(ecc, offset);
 303
 304         val &= and;
 305         edma_write(ecc, offset, val);
 306 }
 307
 308 static inline void edma_or(struct edma_cc *ecc, int offset, unsigned or)
 309 {
 310         unsigned val = edma_read(ecc, offset);
 311
 312         val |= or;
 313         edma_write(ecc, offset, val);
 314 }
 315
 316 static inline unsigned int edma_read_array(struct edma_cc *ecc, int offset,
 317                                            int i)
 318 {
 319         return edma_read(ecc, offset + (i << 2));
 320 }
 321
 322 static inline void edma_write_array(struct edma_cc *ecc, int offset, int i,
 323                                     unsigned val)
 324 {
 325         edma_write(ecc, offset + (i << 2), val);
 326 }
 327
 328 static inline void edma_modify_array(struct edma_cc *ecc, int offset, int i,
 329                                      unsigned and, unsigned or)
 330 {
 331         edma_modify(ecc, offset + (i << 2), and, or);
 332 }
 333
 334 static inline void edma_or_array(struct edma_cc *ecc, int offset, int i,
 335                                  unsigned or)
 336 {
 337         edma_or(ecc, offset + (i << 2), or);
 338 }
 339
 340 static inline void edma_or_array2(struct edma_cc *ecc, int offset, int i, int j,
 341                                   unsigned or)
 342 {
 343         edma_or(ecc, offset + ((i * 2 + j) << 2), or);
 344 }
 345
 346 static inline void edma_write_array2(struct edma_cc *ecc, int offset, int i,
 347                                      int j, unsigned val)
 348 {
 349         edma_write(ecc, offset + ((i * 2 + j) << 2), val);
 350 }
 351
 352 static inline unsigned int edma_shadow0_read(struct edma_cc *ecc, int offset)
 353 {
 354         return edma_read(ecc, EDMA_SHADOW0 + offset);
 355 }
 356
 357 static inline unsigned int edma_shadow0_read_array(struct edma_cc *ecc,
 358                                                    int offset, int i)
 359 {
 360         return edma_read(ecc, EDMA_SHADOW0 + offset + (i << 2));
 361 }
 362
 363 static inline void edma_shadow0_write(struct edma_cc *ecc, int offset,
 364                                       unsigned val)
 365 {
 366         edma_write(ecc, EDMA_SHADOW0 + offset, val);
 367 }
 368
 369 static inline void edma_shadow0_write_array(struct edma_cc *ecc, int offset,
 370                                             int i, unsigned val)
 371 {
 372         edma_write(ecc, EDMA_SHADOW0 + offset + (i << 2), val);
 373 }
 374
 375 static inline unsigned int edma_param_read(struct edma_cc *ecc, int offset,
 376                                            int param_no)
 377 {
 378         return edma_read(ecc, EDMA_PARM + offset + (param_no << 5));
 379 }
 380
 381 static inline void edma_param_write(struct edma_cc *ecc, int offset,
 382                                     int param_no, unsigned val)
 383 {
 384         edma_write(ecc, EDMA_PARM + offset + (param_no << 5), val);
 385 }
 386
 387 static inline void edma_param_modify(struct edma_cc *ecc, int offset,
 388                                      int param_no, unsigned and, unsigned or)
 389 {
 390         edma_modify(ecc, EDMA_PARM + offset + (param_no << 5), and, or);
 391 }
 392
 393 static inline void edma_param_and(struct edma_cc *ecc, int offset, int param_no,
 394                                   unsigned and)
 395 {
 396         edma_and(ecc, EDMA_PARM + offset + (param_no << 5), and);
 397 }
 398
 399 static inline void edma_param_or(struct edma_cc *ecc, int offset, int param_no,
 400                                  unsigned or)
 401 {
 402         edma_or(ecc, EDMA_PARM + offset + (param_no << 5), or);
 403 }
 404
 405 static inline void set_bits(int offset, int len, unsigned long *p)
 406 {
 407         for (; len > 0; len--)
 408                 set_bit(offset + (len - 1), p);
 409 }
 410
 411 static inline void clear_bits(int offset, int len, unsigned long *p)
 412 {
 413         for (; len > 0; len--)
 414                 clear_bit(offset + (len - 1), p);
 415 }
 416
 417 static void edma_assign_priority_to_queue(struct edma_cc *ecc, int queue_no,
 418                                           int priority)
 419 {
 420         int bit = queue_no * 4;
 421
 422         edma_modify(ecc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
 423 }
 424
 425 static void edma_set_chmap(struct edma_chan *echan, int slot)
 426 {
 427         struct edma_cc *ecc = echan->ecc;
 428         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 429
 430         if (ecc->chmap_exist) {
 431                 slot = EDMA_CHAN_SLOT(slot);
 432                 edma_write_array(ecc, EDMA_DCHMAP, channel, (slot << 5));
 433         }
 434 }
 435
 436 static void edma_setup_interrupt(struct edma_chan *echan, bool enable)
 437 {
 438         struct edma_cc *ecc = echan->ecc;
 439         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 440
 441         if (enable) {
 442                 edma_shadow0_write_array(ecc, SH_ICR, channel >> 5,
 443                                          BIT(channel & 0x1f));
 444                 edma_shadow0_write_array(ecc, SH_IESR, channel >> 5,
 445                                          BIT(channel & 0x1f));
 446         } else {
 447                 edma_shadow0_write_array(ecc, SH_IECR, channel >> 5,
 448                                          BIT(channel & 0x1f));
 449         }
 450 }
 451
 452 /*
 453  * paRAM slot management functions
 454  */
 455 static void edma_write_slot(struct edma_cc *ecc, unsigned slot,
 456                             const struct edmacc_param *param)
 457 {
 458         slot = EDMA_CHAN_SLOT(slot);
 459         if (slot >= ecc->num_slots)
 460                 return;
 461         memcpy_toio(ecc->base + PARM_OFFSET(slot), param, PARM_SIZE);
 462 }
 463
 464 static void edma_read_slot(struct edma_cc *ecc, unsigned slot,
 465                            struct edmacc_param *param)
 466 {
 467         slot = EDMA_CHAN_SLOT(slot);
 468         if (slot >= ecc->num_slots)
 469                 return;
 470         memcpy_fromio(param, ecc->base + PARM_OFFSET(slot), PARM_SIZE);
 471 }
 472
 473 /**
 474  * edma_alloc_slot - allocate DMA parameter RAM
 475  * @ecc: pointer to edma_cc struct
 476  * @slot: specific slot to allocate; negative for "any unused slot"
 477  *
 478  * This allocates a parameter RAM slot, initializing it to hold a
 479  * dummy transfer.  Slots allocated using this routine have not been
 480  * mapped to a hardware DMA channel, and will normally be used by
 481  * linking to them from a slot associated with a DMA channel.
 482  *
 483  * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
 484  * slots may be allocated on behalf of DSP firmware.
 485  *
 486  * Returns the number of the slot, else negative errno.
 487  */
 488 static int edma_alloc_slot(struct edma_cc *ecc, int slot)
 489 {
 490         if (slot >= 0) {
 491                 slot = EDMA_CHAN_SLOT(slot);
 492                 /* Requesting entry paRAM slot for a HW triggered channel. */
 493                 if (ecc->chmap_exist && slot < ecc->num_channels)
 494                         slot = EDMA_SLOT_ANY;
 495         }
 496
 497         if (slot < 0) {
 498                 if (ecc->chmap_exist)
 499                         slot = 0;
 500                 else
 501                         slot = ecc->num_channels;
 502                 for (;;) {
 503                         slot = find_next_zero_bit(ecc->slot_inuse,
 504                                                   ecc->num_slots,
 505                                                   slot);
 506                         if (slot == ecc->num_slots)
 507                                 return -ENOMEM;
 508                         if (!test_and_set_bit(slot, ecc->slot_inuse))
 509                                 break;
 510                 }
 511         } else if (slot >= ecc->num_slots) {
 512                 return -EINVAL;
 513         } else if (test_and_set_bit(slot, ecc->slot_inuse)) {
 514                 return -EBUSY;
 515         }
 516
 517         edma_write_slot(ecc, slot, &dummy_paramset);
 518
 519         return EDMA_CTLR_CHAN(ecc->id, slot);
 520 }
 521
 522 static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
 523 {
 524         slot = EDMA_CHAN_SLOT(slot);
 525         if (slot >= ecc->num_slots)
 526                 return;
 527
 528         edma_write_slot(ecc, slot, &dummy_paramset);
 529         clear_bit(slot, ecc->slot_inuse);
 530 }
 531
 532 /**
 533  * edma_link - link one parameter RAM slot to another
 534  * @ecc: pointer to edma_cc struct
 535  * @from: parameter RAM slot originating the link
 536  * @to: parameter RAM slot which is the link target
 537  *
 538  * The originating slot should not be part of any active DMA transfer.
 539  */
 540 static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
 541 {
 542         if (unlikely(EDMA_CTLR(from) != EDMA_CTLR(to)))
 543                 dev_warn(ecc->dev, "Ignoring eDMA instance for linking\n");
 544
 545         from = EDMA_CHAN_SLOT(from);
 546         to = EDMA_CHAN_SLOT(to);
 547         if (from >= ecc->num_slots || to >= ecc->num_slots)
 548                 return;
 549
 550         edma_param_modify(ecc, PARM_LINK_BCNTRLD, from, 0xffff0000,
 551                           PARM_OFFSET(to));
 552 }
 553
 554 /**
 555  * edma_get_position - returns the current transfer point
 556  * @ecc: pointer to edma_cc struct
 557  * @slot: parameter RAM slot being examined
 558  * @dst:  true selects the dest position, false the source
 559  *
 560  * Returns the position of the current active slot
 561  */
 562 static dma_addr_t edma_get_position(struct edma_cc *ecc, unsigned slot,
 563                                     bool dst)
 564 {
 565         u32 offs;
 566
 567         slot = EDMA_CHAN_SLOT(slot);
 568         offs = PARM_OFFSET(slot);
 569         offs += dst ? PARM_DST : PARM_SRC;
 570
 571         return edma_read(ecc, offs);
 572 }
 573
 574 /*
 575  * Channels with event associations will be triggered by their hardware
 576  * events, and channels without such associations will be triggered by
 577  * software.  (At this writing there is no interface for using software
 578  * triggers except with channels that don't support hardware triggers.)
 579  */
 580 static void edma_start(struct edma_chan *echan)
 581 {
 582         struct edma_cc *ecc = echan->ecc;
 583         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 584         int j = (channel >> 5);
 585         unsigned int mask = BIT(channel & 0x1f);
 586
 587         if (!echan->hw_triggered) {
 588                 /* EDMA channels without event association */
 589                 dev_dbg(ecc->dev, "ESR%d %08x\n", j,
 590                         edma_shadow0_read_array(ecc, SH_ESR, j));
 591                 edma_shadow0_write_array(ecc, SH_ESR, j, mask);
 592         } else {
 593                 /* EDMA channel with event association */
 594                 dev_dbg(ecc->dev, "ER%d %08x\n", j,
 595                         edma_shadow0_read_array(ecc, SH_ER, j));
 596                 /* Clear any pending event or error */
 597                 edma_write_array(ecc, EDMA_ECR, j, mask);
 598                 edma_write_array(ecc, EDMA_EMCR, j, mask);
 599                 /* Clear any SER */
 600                 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
 601                 edma_shadow0_write_array(ecc, SH_EESR, j, mask);
 602                 dev_dbg(ecc->dev, "EER%d %08x\n", j,
 603                         edma_shadow0_read_array(ecc, SH_EER, j));
 604         }
 605 }
 606
 607 static void edma_stop(struct edma_chan *echan)
 608 {
 609         struct edma_cc *ecc = echan->ecc;
 610         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 611         int j = (channel >> 5);
 612         unsigned int mask = BIT(channel & 0x1f);
 613
 614         edma_shadow0_write_array(ecc, SH_EECR, j, mask);
 615         edma_shadow0_write_array(ecc, SH_ECR, j, mask);
 616         edma_shadow0_write_array(ecc, SH_SECR, j, mask);
 617         edma_write_array(ecc, EDMA_EMCR, j, mask);
 618
 619         /* clear possibly pending completion interrupt */
 620         edma_shadow0_write_array(ecc, SH_ICR, j, mask);
 621
 622         dev_dbg(ecc->dev, "EER%d %08x\n", j,
 623                 edma_shadow0_read_array(ecc, SH_EER, j));
 624
 625         /* REVISIT:  consider guarding against inappropriate event
 626          * chaining by overwriting with dummy_paramset.
 627          */
 628 }
 629
 630 /*
 631  * Temporarily disable EDMA hardware events on the specified channel,
 632  * preventing them from triggering new transfers
 633  */
 634 static void edma_pause(struct edma_chan *echan)
 635 {
 636         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 637         unsigned int mask = BIT(channel & 0x1f);
 638
 639         edma_shadow0_write_array(echan->ecc, SH_EECR, channel >> 5, mask);
 640 }
 641
 642 /* Re-enable EDMA hardware events on the specified channel.  */
 643 static void edma_resume(struct edma_chan *echan)
 644 {
 645         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 646         unsigned int mask = BIT(channel & 0x1f);
 647
 648         edma_shadow0_write_array(echan->ecc, SH_EESR, channel >> 5, mask);
 649 }
 650
 651 static void edma_trigger_channel(struct edma_chan *echan)
 652 {
 653         struct edma_cc *ecc = echan->ecc;
 654         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 655         unsigned int mask = BIT(channel & 0x1f);
 656
 657         edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
 658
 659         dev_dbg(ecc->dev, "ESR%d %08x\n", (channel >> 5),
 660                 edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
 661 }
 662
 663 static void edma_clean_channel(struct edma_chan *echan)
 664 {
 665         struct edma_cc *ecc = echan->ecc;
 666         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 667         int j = (channel >> 5);
 668         unsigned int mask = BIT(channel & 0x1f);
 669
 670         dev_dbg(ecc->dev, "EMR%d %08x\n", j, edma_read_array(ecc, EDMA_EMR, j));
 671         edma_shadow0_write_array(ecc, SH_ECR, j, mask);
 672         /* Clear the corresponding EMR bits */
 673         edma_write_array(ecc, EDMA_EMCR, j, mask);
 674         /* Clear any SER */
 675         edma_shadow0_write_array(ecc, SH_SECR, j, mask);
 676         edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
 677 }
 678
 679 /* Move channel to a specific event queue */
 680 static void edma_assign_channel_eventq(struct edma_chan *echan,
 681                                        enum dma_event_q eventq_no)
 682 {
 683         struct edma_cc *ecc = echan->ecc;
 684         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 685         int bit = (channel & 0x7) * 4;
 686
 687         /* default to low priority queue */
 688         if (eventq_no == EVENTQ_DEFAULT)
 689                 eventq_no = ecc->default_queue;
 690         if (eventq_no >= ecc->num_tc)
 691                 return;
 692
 693         eventq_no &= 7;
 694         edma_modify_array(ecc, EDMA_DMAQNUM, (channel >> 3), ~(0x7 << bit),
 695                           eventq_no << bit);
 696 }
 697
 698 static int edma_alloc_channel(struct edma_chan *echan,
 699                               enum dma_event_q eventq_no)
 700 {
 701         struct edma_cc *ecc = echan->ecc;
 702         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 703
 704         /* ensure access through shadow region 0 */
 705         edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
 706
 707         /* ensure no events are pending */
 708         edma_stop(echan);
 709
 710         edma_setup_interrupt(echan, true);
 711
 712         edma_assign_channel_eventq(echan, eventq_no);
 713
 714         return 0;
 715 }
 716
 717 static void edma_free_channel(struct edma_chan *echan)
 718 {
 719         /* ensure no events are pending */
 720         edma_stop(echan);
 721         /* REVISIT should probably take out of shadow region 0 */
 722         edma_setup_interrupt(echan, false);
 723 }
 724
 725 static inline struct edma_cc *to_edma_cc(struct dma_device *d)
 726 {
 727         return container_of(d, struct edma_cc, dma_slave);
 728 }
 729
 730 static inline struct edma_chan *to_edma_chan(struct dma_chan *c)
 731 {
 732         return container_of(c, struct edma_chan, vchan.chan);
 733 }
 734
 735 static inline struct edma_desc *to_edma_desc(struct dma_async_tx_descriptor *tx)
 736 {
 737         return container_of(tx, struct edma_desc, vdesc.tx);
 738 }
 739
 740 static void edma_desc_free(struct virt_dma_desc *vdesc)
 741 {
 742         kfree(container_of(vdesc, struct edma_desc, vdesc));
 743 }
 744
 745 /* Dispatch a queued descriptor to the controller (caller holds lock) */
 746 static void edma_execute(struct edma_chan *echan)
 747 {
 748         struct edma_cc *ecc = echan->ecc;
 749         struct virt_dma_desc *vdesc;
 750         struct edma_desc *edesc;
 751         struct device *dev = echan->vchan.chan.device->dev;
 752         int i, j, left, nslots;
 753
 754         if (!echan->edesc) {
 755                 /* Setup is needed for the first transfer */
 756                 vdesc = vchan_next_desc(&echan->vchan);
 757                 if (!vdesc)
 758                         return;
 759                 list_del(&vdesc->node);
 760                 echan->edesc = to_edma_desc(&vdesc->tx);
 761         }
 762
 763         edesc = echan->edesc;
 764
 765         /* Find out how many left */
 766         left = edesc->pset_nr - edesc->processed;
 767         nslots = min(MAX_NR_SG, left);
 768         edesc->sg_len = 0;
 769
 770         /* Write descriptor PaRAM set(s) */
 771         for (i = 0; i < nslots; i++) {
 772                 j = i + edesc->processed;
 773                 edma_write_slot(ecc, echan->slot[i], &edesc->pset[j].param);
 774                 edesc->sg_len += edesc->pset[j].len;
 775                 dev_vdbg(dev,
 776                          "\n pset[%d]:\n"
 777                          "  chnum\t%d\n"
 778                          "  slot\t%d\n"
 779                          "  opt\t%08x\n"
 780                          "  src\t%08x\n"
 781                          "  dst\t%08x\n"
 782                          "  abcnt\t%08x\n"
 783                          "  ccnt\t%08x\n"
 784                          "  bidx\t%08x\n"
 785                          "  cidx\t%08x\n"
 786                          "  lkrld\t%08x\n",
 787                          j, echan->ch_num, echan->slot[i],
 788                          edesc->pset[j].param.opt,
 789                          edesc->pset[j].param.src,
 790                          edesc->pset[j].param.dst,
 791                          edesc->pset[j].param.a_b_cnt,
 792                          edesc->pset[j].param.ccnt,
 793                          edesc->pset[j].param.src_dst_bidx,
 794                          edesc->pset[j].param.src_dst_cidx,
 795                          edesc->pset[j].param.link_bcntrld);
 796                 /* Link to the previous slot if not the last set */
 797                 if (i != (nslots - 1))
 798                         edma_link(ecc, echan->slot[i], echan->slot[i + 1]);
 799         }
 800
 801         edesc->processed += nslots;
 802
 803         /*
 804          * If this is either the last set in a set of SG-list transactions
 805          * then setup a link to the dummy slot, this results in all future
 806          * events being absorbed and that's OK because we're done
 807          */
 808         if (edesc->processed == edesc->pset_nr) {
 809                 if (edesc->cyclic)
 810                         edma_link(ecc, echan->slot[nslots - 1], echan->slot[1]);
 811                 else
 812                         edma_link(ecc, echan->slot[nslots - 1],
 813                                   echan->ecc->dummy_slot);
 814         }
 815
 816         if (echan->missed) {
 817                 /*
 818                  * This happens due to setup times between intermediate
 819                  * transfers in long SG lists which have to be broken up into
 820                  * transfers of MAX_NR_SG
 821                  */
 822                 dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
 823                 edma_clean_channel(echan);
 824                 edma_stop(echan);
 825                 edma_start(echan);
 826                 edma_trigger_channel(echan);
 827                 echan->missed = 0;
 828         } else if (edesc->processed <= MAX_NR_SG) {
 829                 dev_dbg(dev, "first transfer starting on channel %d\n",
 830                         echan->ch_num);
 831                 edma_start(echan);
 832         } else {
 833                 dev_dbg(dev, "chan: %d: completed %d elements, resuming\n",
 834                         echan->ch_num, edesc->processed);
 835                 edma_resume(echan);
 836         }
 837 }
 838
 839 static int edma_terminate_all(struct dma_chan *chan)
 840 {
 841         struct edma_chan *echan = to_edma_chan(chan);
 842         unsigned long flags;
 843         LIST_HEAD(head);
 844
 845         spin_lock_irqsave(&echan->vchan.lock, flags);
 846
 847         /*
 848          * Stop DMA activity: we assume the callback will not be called
 849          * after edma_dma() returns (even if it does, it will see
 850          * echan->edesc is NULL and exit.)
 851          */
 852         if (echan->edesc) {
 853                 edma_stop(echan);
 854                 /* Move the cyclic channel back to default queue */
 855                 if (!echan->tc && echan->edesc->cyclic)
 856                         edma_assign_channel_eventq(echan, EVENTQ_DEFAULT);
 857                 /*
 858                  * free the running request descriptor
 859                  * since it is not in any of the vdesc lists
 860                  */
 861                 edma_desc_free(&echan->edesc->vdesc);
 862                 echan->edesc = NULL;
 863         }
 864
 865         vchan_get_all_descriptors(&echan->vchan, &head);
 866         spin_unlock_irqrestore(&echan->vchan.lock, flags);
 867         vchan_dma_desc_free_list(&echan->vchan, &head);
 868
 869         return 0;
 870 }
 871
 872 static void edma_synchronize(struct dma_chan *chan)
 873 {
 874         struct edma_chan *echan = to_edma_chan(chan);
 875
 876         vchan_synchronize(&echan->vchan);
 877 }
 878
 879 static int edma_slave_config(struct dma_chan *chan,
 880         struct dma_slave_config *cfg)
 881 {
 882         struct edma_chan *echan = to_edma_chan(chan);
 883
 884         if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
 885             cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
 886                 return -EINVAL;
 887
 888         memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
 889
 890         return 0;
 891 }
 892
 893 static int edma_dma_pause(struct dma_chan *chan)
 894 {
 895         struct edma_chan *echan = to_edma_chan(chan);
 896
 897         if (!echan->edesc)
 898                 return -EINVAL;
 899
 900         edma_pause(echan);
 901         return 0;
 902 }
 903
 904 static int edma_dma_resume(struct dma_chan *chan)
 905 {
 906         struct edma_chan *echan = to_edma_chan(chan);
 907
 908         edma_resume(echan);
 909         return 0;
 910 }
 911
 912 /*
 913  * A PaRAM set configuration abstraction used by other modes
 914  * @chan: Channel who's PaRAM set we're configuring
 915  * @pset: PaRAM set to initialize and setup.
 916  * @src_addr: Source address of the DMA
 917  * @dst_addr: Destination address of the DMA
 918  * @burst: In units of dev_width, how much to send
 919  * @dev_width: How much is the dev_width
 920  * @dma_length: Total length of the DMA transfer
 921  * @direction: Direction of the transfer
 922  */
 923 static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset,
 924                             dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
 925                             unsigned int acnt, unsigned int dma_length,
 926                             enum dma_transfer_direction direction)
 927 {
 928         struct edma_chan *echan = to_edma_chan(chan);
 929         struct device *dev = chan->device->dev;
 930         struct edmacc_param *param = &epset->param;
 931         int bcnt, ccnt, cidx;
 932         int src_bidx, dst_bidx, src_cidx, dst_cidx;
 933         int absync;
 934
 935         /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */
 936         if (!burst)
 937                 burst = 1;
 938         /*
 939          * If the maxburst is equal to the fifo width, use
 940          * A-synced transfers. This allows for large contiguous
 941          * buffer transfers using only one PaRAM set.
 942          */
 943         if (burst == 1) {
 944                 /*
 945                  * For the A-sync case, bcnt and ccnt are the remainder
 946                  * and quotient respectively of the division of:
 947                  * (dma_length / acnt) by (SZ_64K -1). This is so
 948                  * that in case bcnt over flows, we have ccnt to use.
 949                  * Note: In A-sync tranfer only, bcntrld is used, but it
 950                  * only applies for sg_dma_len(sg) >= SZ_64K.
 951                  * In this case, the best way adopted is- bccnt for the
 952                  * first frame will be the remainder below. Then for
 953                  * every successive frame, bcnt will be SZ_64K-1. This
 954                  * is assured as bcntrld = 0xffff in end of function.
 955                  */
 956                 absync = false;
 957                 ccnt = dma_length / acnt / (SZ_64K - 1);
 958                 bcnt = dma_length / acnt - ccnt * (SZ_64K - 1);
 959                 /*
 960                  * If bcnt is non-zero, we have a remainder and hence an
 961                  * extra frame to transfer, so increment ccnt.
 962                  */
 963                 if (bcnt)
 964                         ccnt++;
 965                 else
 966                         bcnt = SZ_64K - 1;
 967                 cidx = acnt;
 968         } else {
 969                 /*
 970                  * If maxburst is greater than the fifo address_width,
 971                  * use AB-synced transfers where A count is the fifo
 972                  * address_width and B count is the maxburst. In this
 973                  * case, we are limited to transfers of C count frames
 974                  * of (address_width * maxburst) where C count is limited
 975                  * to SZ_64K-1. This places an upper bound on the length
 976                  * of an SG segment that can be handled.
 977                  */
 978                 absync = true;
 979                 bcnt = burst;
 980                 ccnt = dma_length / (acnt * bcnt);
 981                 if (ccnt > (SZ_64K - 1)) {
 982                         dev_err(dev, "Exceeded max SG segment size\n");
 983                         return -EINVAL;
 984                 }
 985                 cidx = acnt * bcnt;
 986         }
 987
 988         epset->len = dma_length;
 989
 990         if (direction == DMA_MEM_TO_DEV) {
 991                 src_bidx = acnt;
 992                 src_cidx = cidx;
 993                 dst_bidx = 0;
 994                 dst_cidx = 0;
 995                 epset->addr = src_addr;
 996         } else if (direction == DMA_DEV_TO_MEM)  {
 997                 src_bidx = 0;
 998                 src_cidx = 0;
 999                 dst_bidx = acnt;
1000                 dst_cidx = cidx;
1001                 epset->addr = dst_addr;
1002         } else if (direction == DMA_MEM_TO_MEM)  {
1003                 src_bidx = acnt;
1004                 src_cidx = cidx;
1005                 dst_bidx = acnt;
1006                 dst_cidx = cidx;
1007         } else {
1008                 dev_err(dev, "%s: direction not implemented yet\n", __func__);
1009                 return -EINVAL;
1010         }
1011
1012         param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num));
1013         /* Configure A or AB synchronized transfers */
1014         if (absync)
1015                 param->opt |= SYNCDIM;
1016
1017         param->src = src_addr;
1018         param->dst = dst_addr;
1019
1020         param->src_dst_bidx = (dst_bidx << 16) | src_bidx;
1021         param->src_dst_cidx = (dst_cidx << 16) | src_cidx;
1022
1023         param->a_b_cnt = bcnt << 16 | acnt;
1024         param->ccnt = ccnt;
1025         /*
1026          * Only time when (bcntrld) auto reload is required is for
1027          * A-sync case, and in this case, a requirement of reload value
1028          * of SZ_64K-1 only is assured. 'link' is initially set to NULL
1029          * and then later will be populated by edma_execute.
1030          */
1031         param->link_bcntrld = 0xffffffff;
1032         return absync;
1033 }
1034
1035 static struct dma_async_tx_descriptor *edma_prep_slave_sg(
1036         struct dma_chan *chan, struct scatterlist *sgl,
1037         unsigned int sg_len, enum dma_transfer_direction direction,
1038         unsigned long tx_flags, void *context)
1039 {
1040         struct edma_chan *echan = to_edma_chan(chan);
1041         struct device *dev = chan->device->dev;
1042         struct edma_desc *edesc;
1043         dma_addr_t src_addr = 0, dst_addr = 0;
1044         enum dma_slave_buswidth dev_width;
1045         u32 burst;
1046         struct scatterlist *sg;
1047         int i, nslots, ret;
1048
1049         if (unlikely(!echan || !sgl || !sg_len))
1050                 return NULL;
1051
1052         if (direction == DMA_DEV_TO_MEM) {
1053                 src_addr = echan->cfg.src_addr;
1054                 dev_width = echan->cfg.src_addr_width;
1055                 burst = echan->cfg.src_maxburst;
1056         } else if (direction == DMA_MEM_TO_DEV) {
1057                 dst_addr = echan->cfg.dst_addr;
1058                 dev_width = echan->cfg.dst_addr_width;
1059                 burst = echan->cfg.dst_maxburst;
1060         } else {
1061                 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
1062                 return NULL;
1063         }
1064
1065         if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
1066                 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
1067                 return NULL;
1068         }
1069
1070         edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]),
1071                         GFP_ATOMIC);
1072         if (!edesc) {
1073                 dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
1074                 return NULL;
1075         }
1076
1077         edesc->pset_nr = sg_len;
1078         edesc->residue = 0;
1079         edesc->direction = direction;
1080         edesc->echan = echan;
1081
1082         /* Allocate a PaRAM slot, if needed */
1083         nslots = min_t(unsigned, MAX_NR_SG, sg_len);
1084
1085         for (i = 0; i < nslots; i++) {
1086                 if (echan->slot[i] < 0) {
1087                         echan->slot[i] =
1088                                 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
1089                         if (echan->slot[i] < 0) {
1090                                 kfree(edesc);
1091                                 dev_err(dev, "%s: Failed to allocate slot\n",
1092                                         __func__);
1093                                 return NULL;
1094                         }
1095                 }
1096         }
1097
1098         /* Configure PaRAM sets for each SG */
1099         for_each_sg(sgl, sg, sg_len, i) {
1100                 /* Get address for each SG */
1101                 if (direction == DMA_DEV_TO_MEM)
1102                         dst_addr = sg_dma_address(sg);
1103                 else
1104                         src_addr = sg_dma_address(sg);
1105
1106                 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1107                                        dst_addr, burst, dev_width,
1108                                        sg_dma_len(sg), direction);
1109                 if (ret < 0) {
1110                         kfree(edesc);
1111                         return NULL;
1112                 }
1113
1114                 edesc->absync = ret;
1115                 edesc->residue += sg_dma_len(sg);
1116
1117                 /* If this is the last in a current SG set of transactions,
1118                    enable interrupts so that next set is processed */
1119                 if (!((i+1) % MAX_NR_SG))
1120                         edesc->pset[i].param.opt |= TCINTEN;
1121
1122                 /* If this is the last set, enable completion interrupt flag */
1123                 if (i == sg_len - 1)
1124                         edesc->pset[i].param.opt |= TCINTEN;
1125         }
1126         edesc->residue_stat = edesc->residue;
1127
1128         return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1129 }
1130
1131 static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
1132         struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1133         size_t len, unsigned long tx_flags)
1134 {
1135         int ret, nslots;
1136         struct edma_desc *edesc;
1137         struct device *dev = chan->device->dev;
1138         struct edma_chan *echan = to_edma_chan(chan);
1139         unsigned int width, pset_len;
1140
1141         if (unlikely(!echan || !len))
1142                 return NULL;
1143
1144         if (len < SZ_64K) {
1145                 /*
1146                  * Transfer size less than 64K can be handled with one paRAM
1147                  * slot and with one burst.
1148                  * ACNT = length
1149                  */
1150                 width = len;
1151                 pset_len = len;
1152                 nslots = 1;
1153         } else {
1154                 /*
1155                  * Transfer size bigger than 64K will be handled with maximum of
1156                  * two paRAM slots.
1157                  * slot1: (full_length / 32767) times 32767 bytes bursts.
1158                  *        ACNT = 32767, length1: (full_length / 32767) * 32767
1159                  * slot2: the remaining amount of data after slot1.
1160                  *        ACNT = full_length - length1, length2 = ACNT
1161                  *
1162                  * When the full_length is multibple of 32767 one slot can be
1163                  * used to complete the transfer.
1164                  */
1165                 width = SZ_32K - 1;
1166                 pset_len = rounddown(len, width);
1167                 /* One slot is enough for lengths multiple of (SZ_32K -1) */
1168                 if (unlikely(pset_len == len))
1169                         nslots = 1;
1170                 else
1171                         nslots = 2;
1172         }
1173
1174         edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1175                         GFP_ATOMIC);
1176         if (!edesc) {
1177                 dev_dbg(dev, "Failed to allocate a descriptor\n");
1178                 return NULL;
1179         }
1180
1181         edesc->pset_nr = nslots;
1182         edesc->residue = edesc->residue_stat = len;
1183         edesc->direction = DMA_MEM_TO_MEM;
1184         edesc->echan = echan;
1185
1186         ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
1187                                width, pset_len, DMA_MEM_TO_MEM);
1188         if (ret < 0) {
1189                 kfree(edesc);
1190                 return NULL;
1191         }
1192
1193         edesc->absync = ret;
1194
1195         edesc->pset[0].param.opt |= ITCCHEN;
1196         if (nslots == 1) {
1197                 /* Enable transfer complete interrupt */
1198                 edesc->pset[0].param.opt |= TCINTEN;
1199         } else {
1200                 /* Enable transfer complete chaining for the first slot */
1201                 edesc->pset[0].param.opt |= TCCHEN;
1202
1203                 if (echan->slot[1] < 0) {
1204                         echan->slot[1] = edma_alloc_slot(echan->ecc,
1205                                                          EDMA_SLOT_ANY);
1206                         if (echan->slot[1] < 0) {
1207                                 kfree(edesc);
1208                                 dev_err(dev, "%s: Failed to allocate slot\n",
1209                                         __func__);
1210                                 return NULL;
1211                         }
1212                 }
1213                 dest += pset_len;
1214                 src += pset_len;
1215                 pset_len = width = len % (SZ_32K - 1);
1216
1217                 ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,
1218                                        width, pset_len, DMA_MEM_TO_MEM);
1219                 if (ret < 0) {
1220                         kfree(edesc);
1221                         return NULL;
1222                 }
1223
1224                 edesc->pset[1].param.opt |= ITCCHEN;
1225                 edesc->pset[1].param.opt |= TCINTEN;
1226         }
1227
1228         return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1229 }
1230
1231 static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
1232         struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
1233         size_t period_len, enum dma_transfer_direction direction,
1234         unsigned long tx_flags)
1235 {
1236         struct edma_chan *echan = to_edma_chan(chan);
1237         struct device *dev = chan->device->dev;
1238         struct edma_desc *edesc;
1239         dma_addr_t src_addr, dst_addr;
1240         enum dma_slave_buswidth dev_width;
1241         u32 burst;
1242         int i, ret, nslots;
1243
1244         if (unlikely(!echan || !buf_len || !period_len))
1245                 return NULL;
1246
1247         if (direction == DMA_DEV_TO_MEM) {
1248                 src_addr = echan->cfg.src_addr;
1249                 dst_addr = buf_addr;
1250                 dev_width = echan->cfg.src_addr_width;
1251                 burst = echan->cfg.src_maxburst;
1252         } else if (direction == DMA_MEM_TO_DEV) {
1253                 src_addr = buf_addr;
1254                 dst_addr = echan->cfg.dst_addr;
1255                 dev_width = echan->cfg.dst_addr_width;
1256                 burst = echan->cfg.dst_maxburst;
1257         } else {
1258                 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
1259                 return NULL;
1260         }
1261
1262         if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
1263                 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
1264                 return NULL;
1265         }
1266
1267         if (unlikely(buf_len % period_len)) {
1268                 dev_err(dev, "Period should be multiple of Buffer length\n");
1269                 return NULL;
1270         }
1271
1272         nslots = (buf_len / period_len) + 1;
1273
1274         /*
1275          * Cyclic DMA users such as audio cannot tolerate delays introduced
1276          * by cases where the number of periods is more than the maximum
1277          * number of SGs the EDMA driver can handle at a time. For DMA types
1278          * such as Slave SGs, such delays are tolerable and synchronized,
1279          * but the synchronization is difficult to achieve with Cyclic and
1280          * cannot be guaranteed, so we error out early.
1281          */
1282         if (nslots > MAX_NR_SG)
1283                 return NULL;
1284
1285         edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1286                         GFP_ATOMIC);
1287         if (!edesc) {
1288                 dev_err(dev, "%s: Failed to allocate a descriptor\n", __func__);
1289                 return NULL;
1290         }
1291
1292         edesc->cyclic = 1;
1293         edesc->pset_nr = nslots;
1294         edesc->residue = edesc->residue_stat = buf_len;
1295         edesc->direction = direction;
1296         edesc->echan = echan;
1297
1298         dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n",
1299                 __func__, echan->ch_num, nslots, period_len, buf_len);
1300
1301         for (i = 0; i < nslots; i++) {
1302                 /* Allocate a PaRAM slot, if needed */
1303                 if (echan->slot[i] < 0) {
1304                         echan->slot[i] =
1305                                 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
1306                         if (echan->slot[i] < 0) {
1307                                 kfree(edesc);
1308                                 dev_err(dev, "%s: Failed to allocate slot\n",
1309                                         __func__);
1310                                 return NULL;
1311                         }
1312                 }
1313
1314                 if (i == nslots - 1) {
1315                         memcpy(&edesc->pset[i], &edesc->pset[0],
1316                                sizeof(edesc->pset[0]));
1317                         break;
1318                 }
1319
1320                 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1321                                        dst_addr, burst, dev_width, period_len,
1322                                        direction);
1323                 if (ret < 0) {
1324                         kfree(edesc);
1325                         return NULL;
1326                 }
1327
1328                 if (direction == DMA_DEV_TO_MEM)
1329                         dst_addr += period_len;
1330                 else
1331                         src_addr += period_len;
1332
1333                 dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i);
1334                 dev_vdbg(dev,
1335                         "\n pset[%d]:\n"
1336                         "  chnum\t%d\n"
1337                         "  slot\t%d\n"
1338                         "  opt\t%08x\n"
1339                         "  src\t%08x\n"
1340                         "  dst\t%08x\n"
1341                         "  abcnt\t%08x\n"
1342                         "  ccnt\t%08x\n"
1343                         "  bidx\t%08x\n"
1344                         "  cidx\t%08x\n"
1345                         "  lkrld\t%08x\n",
1346                         i, echan->ch_num, echan->slot[i],
1347                         edesc->pset[i].param.opt,
1348                         edesc->pset[i].param.src,
1349                         edesc->pset[i].param.dst,
1350                         edesc->pset[i].param.a_b_cnt,
1351                         edesc->pset[i].param.ccnt,
1352                         edesc->pset[i].param.src_dst_bidx,
1353                         edesc->pset[i].param.src_dst_cidx,
1354                         edesc->pset[i].param.link_bcntrld);
1355
1356                 edesc->absync = ret;
1357
1358                 /*
1359                  * Enable period interrupt only if it is requested
1360                  */
1361                 if (tx_flags & DMA_PREP_INTERRUPT)
1362                         edesc->pset[i].param.opt |= TCINTEN;
1363         }
1364
1365         /* Place the cyclic channel to highest priority queue */
1366         if (!echan->tc)
1367                 edma_assign_channel_eventq(echan, EVENTQ_0);
1368
1369         return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1370 }
1371
1372 static void edma_completion_handler(struct edma_chan *echan)
1373 {
1374         struct device *dev = echan->vchan.chan.device->dev;
1375         struct edma_desc *edesc;
1376
1377         spin_lock(&echan->vchan.lock);
1378         edesc = echan->edesc;
1379         if (edesc) {
1380                 if (edesc->cyclic) {
1381                         vchan_cyclic_callback(&edesc->vdesc);
1382                         spin_unlock(&echan->vchan.lock);
1383                         return;
1384                 } else if (edesc->processed == edesc->pset_nr) {
1385                         edesc->residue = 0;
1386                         edma_stop(echan);
1387                         vchan_cookie_complete(&edesc->vdesc);
1388                         echan->edesc = NULL;
1389
1390                         dev_dbg(dev, "Transfer completed on channel %d\n",
1391                                 echan->ch_num);
1392                 } else {
1393                         dev_dbg(dev, "Sub transfer completed on channel %d\n",
1394                                 echan->ch_num);
1395
1396                         edma_pause(echan);
1397
1398                         /* Update statistics for tx_status */
1399                         edesc->residue -= edesc->sg_len;
1400                         edesc->residue_stat = edesc->residue;
1401                         edesc->processed_stat = edesc->processed;
1402                 }
1403                 edma_execute(echan);
1404         }
1405
1406         spin_unlock(&echan->vchan.lock);
1407 }
1408
1409 /* eDMA interrupt handler */
1410 static irqreturn_t dma_irq_handler(int irq, void *data)
1411 {
1412         struct edma_cc *ecc = data;
1413         int ctlr;
1414         u32 sh_ier;
1415         u32 sh_ipr;
1416         u32 bank;
1417
1418         ctlr = ecc->id;
1419         if (ctlr < 0)
1420                 return IRQ_NONE;
1421
1422         dev_vdbg(ecc->dev, "dma_irq_handler\n");
1423
1424         sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
1425         if (!sh_ipr) {
1426                 sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
1427                 if (!sh_ipr)
1428                         return IRQ_NONE;
1429                 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
1430                 bank = 1;
1431         } else {
1432                 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
1433                 bank = 0;
1434         }
1435
1436         do {
1437                 u32 slot;
1438                 u32 channel;
1439
1440                 slot = __ffs(sh_ipr);
1441                 sh_ipr &= ~(BIT(slot));
1442
1443                 if (sh_ier & BIT(slot)) {
1444                         channel = (bank << 5) | slot;
1445                         /* Clear the corresponding IPR bits */
1446                         edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
1447                         edma_completion_handler(&ecc->slave_chans[channel]);
1448                 }
1449         } while (sh_ipr);
1450
1451         edma_shadow0_write(ecc, SH_IEVAL, 1);
1452         return IRQ_HANDLED;
1453 }
1454
1455 static void edma_error_handler(struct edma_chan *echan)
1456 {
1457         struct edma_cc *ecc = echan->ecc;
1458         struct device *dev = echan->vchan.chan.device->dev;
1459         struct edmacc_param p;
1460
1461         if (!echan->edesc)
1462                 return;
1463
1464         spin_lock(&echan->vchan.lock);
1465
1466         edma_read_slot(ecc, echan->slot[0], &p);
1467         /*
1468          * Issue later based on missed flag which will be sure
1469          * to happen as:
1470          * (1) we finished transmitting an intermediate slot and
1471          *     edma_execute is coming up.
1472          * (2) or we finished current transfer and issue will
1473          *     call edma_execute.
1474          *
1475          * Important note: issuing can be dangerous here and
1476          * lead to some nasty recursion when we are in a NULL
1477          * slot. So we avoid doing so and set the missed flag.
1478          */
1479         if (p.a_b_cnt == 0 && p.ccnt == 0) {
1480                 dev_dbg(dev, "Error on null slot, setting miss\n");
1481                 echan->missed = 1;
1482         } else {
1483                 /*
1484                  * The slot is already programmed but the event got
1485                  * missed, so its safe to issue it here.
1486                  */
1487                 dev_dbg(dev, "Missed event, TRIGGERING\n");
1488                 edma_clean_channel(echan);
1489                 edma_stop(echan);
1490                 edma_start(echan);
1491                 edma_trigger_channel(echan);
1492         }
1493         spin_unlock(&echan->vchan.lock);
1494 }
1495
1496 static inline bool edma_error_pending(struct edma_cc *ecc)
1497 {
1498         if (edma_read_array(ecc, EDMA_EMR, 0) ||
1499             edma_read_array(ecc, EDMA_EMR, 1) ||
1500             edma_read(ecc, EDMA_QEMR) || edma_read(ecc, EDMA_CCERR))
1501                 return true;
1502
1503         return false;
1504 }
1505
1506 /* eDMA error interrupt handler */
1507 static irqreturn_t dma_ccerr_handler(int irq, void *data)
1508 {
1509         struct edma_cc *ecc = data;
1510         int i, j;
1511         int ctlr;
1512         unsigned int cnt = 0;
1513         unsigned int val;
1514
1515         ctlr = ecc->id;
1516         if (ctlr < 0)
1517                 return IRQ_NONE;
1518
1519         dev_vdbg(ecc->dev, "dma_ccerr_handler\n");
1520
1521         if (!edma_error_pending(ecc))
1522                 return IRQ_NONE;
1523
1524         while (1) {
1525                 /* Event missed register(s) */
1526                 for (j = 0; j < 2; j++) {
1527                         unsigned long emr;
1528
1529                         val = edma_read_array(ecc, EDMA_EMR, j);
1530                         if (!val)
1531                                 continue;
1532
1533                         dev_dbg(ecc->dev, "EMR%d 0x%08x\n", j, val);
1534                         emr = val;
1535                         for (i = find_next_bit(&emr, 32, 0); i < 32;
1536                              i = find_next_bit(&emr, 32, i + 1)) {
1537                                 int k = (j << 5) + i;
1538
1539                                 /* Clear the corresponding EMR bits */
1540                                 edma_write_array(ecc, EDMA_EMCR, j, BIT(i));
1541                                 /* Clear any SER */
1542                                 edma_shadow0_write_array(ecc, SH_SECR, j,
1543                                                          BIT(i));
1544                                 edma_error_handler(&ecc->slave_chans[k]);
1545                         }
1546                 }
1547
1548                 val = edma_read(ecc, EDMA_QEMR);
1549                 if (val) {
1550                         dev_dbg(ecc->dev, "QEMR 0x%02x\n", val);
1551                         /* Not reported, just clear the interrupt reason. */
1552                         edma_write(ecc, EDMA_QEMCR, val);
1553                         edma_shadow0_write(ecc, SH_QSECR, val);
1554                 }
1555
1556                 val = edma_read(ecc, EDMA_CCERR);
1557                 if (val) {
1558                         dev_warn(ecc->dev, "CCERR 0x%08x\n", val);
1559                         /* Not reported, just clear the interrupt reason. */
1560                         edma_write(ecc, EDMA_CCERRCLR, val);
1561                 }
1562
1563                 if (!edma_error_pending(ecc))
1564                         break;
1565                 cnt++;
1566                 if (cnt > 10)
1567                         break;
1568         }
1569         edma_write(ecc, EDMA_EEVAL, 1);
1570         return IRQ_HANDLED;
1571 }
1572
1573 static void edma_tc_set_pm_state(struct edma_tc *tc, bool enable)
1574 {
1575         struct platform_device *tc_pdev;
1576         int ret;
1577
1578         if (!IS_ENABLED(CONFIG_OF) || !tc)
1579                 return;
1580
1581         tc_pdev = of_find_device_by_node(tc->node);
1582         if (!tc_pdev) {
1583                 pr_err("%s: TPTC device is not found\n", __func__);
1584                 return;
1585         }
1586         if (!pm_runtime_enabled(&tc_pdev->dev))
1587                 pm_runtime_enable(&tc_pdev->dev);
1588
1589         if (enable)
1590                 ret = pm_runtime_get_sync(&tc_pdev->dev);
1591         else
1592                 ret = pm_runtime_put_sync(&tc_pdev->dev);
1593
1594         if (ret < 0)
1595                 pr_err("%s: pm_runtime_%s_sync() failed for %s\n", __func__,
1596                        enable ? "get" : "put", dev_name(&tc_pdev->dev));
1597 }
1598
1599 /* Alloc channel resources */
1600 static int edma_alloc_chan_resources(struct dma_chan *chan)
1601 {
1602         struct edma_chan *echan = to_edma_chan(chan);
1603         struct edma_cc *ecc = echan->ecc;
1604         struct device *dev = ecc->dev;
1605         enum dma_event_q eventq_no = EVENTQ_DEFAULT;
1606         int ret;
1607
1608         if (echan->tc) {
1609                 eventq_no = echan->tc->id;
1610         } else if (ecc->tc_list) {
1611                 /* memcpy channel */
1612                 echan->tc = &ecc->tc_list[ecc->info->default_queue];
1613                 eventq_no = echan->tc->id;
1614         }
1615
1616         ret = edma_alloc_channel(echan, eventq_no);
1617         if (ret)
1618                 return ret;
1619
1620         echan->slot[0] = edma_alloc_slot(ecc, echan->ch_num);
1621         if (echan->slot[0] < 0) {
1622                 dev_err(dev, "Entry slot allocation failed for channel %u\n",
1623                         EDMA_CHAN_SLOT(echan->ch_num));
1624                 goto err_slot;
1625         }
1626
1627         /* Set up channel -> slot mapping for the entry slot */
1628         edma_set_chmap(echan, echan->slot[0]);
1629         echan->alloced = true;
1630
1631         dev_dbg(dev, "Got eDMA channel %d for virt channel %d (%s trigger)\n",
1632                 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id,
1633                 echan->hw_triggered ? "HW" : "SW");
1634
1635         edma_tc_set_pm_state(echan->tc, true);
1636
1637         return 0;
1638
1639 err_slot:
1640         edma_free_channel(echan);
1641         return ret;
1642 }
1643
1644 /* Free channel resources */
1645 static void edma_free_chan_resources(struct dma_chan *chan)
1646 {
1647         struct edma_chan *echan = to_edma_chan(chan);
1648         struct device *dev = echan->ecc->dev;
1649         int i;
1650
1651         /* Terminate transfers */
1652         edma_stop(echan);
1653
1654         vchan_free_chan_resources(&echan->vchan);
1655
1656         /* Free EDMA PaRAM slots */
1657         for (i = 0; i < EDMA_MAX_SLOTS; i++) {
1658                 if (echan->slot[i] >= 0) {
1659                         edma_free_slot(echan->ecc, echan->slot[i]);
1660                         echan->slot[i] = -1;
1661                 }
1662         }
1663
1664         /* Set entry slot to the dummy slot */
1665         edma_set_chmap(echan, echan->ecc->dummy_slot);
1666
1667         /* Free EDMA channel */
1668         if (echan->alloced) {
1669                 edma_free_channel(echan);
1670                 echan->alloced = false;
1671         }
1672
1673         edma_tc_set_pm_state(echan->tc, false);
1674         echan->tc = NULL;
1675         echan->hw_triggered = false;
1676
1677         dev_dbg(dev, "Free eDMA channel %d for virt channel %d\n",
1678                 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id);
1679 }
1680
1681 /* Send pending descriptor to hardware */
1682 static void edma_issue_pending(struct dma_chan *chan)
1683 {
1684         struct edma_chan *echan = to_edma_chan(chan);
1685         unsigned long flags;
1686
1687         spin_lock_irqsave(&echan->vchan.lock, flags);
1688         if (vchan_issue_pending(&echan->vchan) && !echan->edesc)
1689                 edma_execute(echan);
1690         spin_unlock_irqrestore(&echan->vchan.lock, flags);
1691 }
1692
1693 /*
1694  * This limit exists to avoid a possible infinite loop when waiting for proof
1695  * that a particular transfer is completed. This limit can be hit if there
1696  * are large bursts to/from slow devices or the CPU is never able to catch
1697  * the DMA hardware idle. On an AM335x transfering 48 bytes from the UART
1698  * RX-FIFO, as many as 55 loops have been seen.
1699  */
1700 #define EDMA_MAX_TR_WAIT_LOOPS 1000
1701
1702 static u32 edma_residue(struct edma_desc *edesc)
1703 {
1704         bool dst = edesc->direction == DMA_DEV_TO_MEM;
1705         int loop_count = EDMA_MAX_TR_WAIT_LOOPS;
1706         struct edma_chan *echan = edesc->echan;
1707         struct edma_pset *pset = edesc->pset;
1708         dma_addr_t done, pos;
1709         int i;
1710
1711         /*
1712          * We always read the dst/src position from the first RamPar
1713          * pset. That's the one which is active now.
1714          */
1715         pos = edma_get_position(echan->ecc, echan->slot[0], dst);
1716
1717         /*
1718          * "pos" may represent a transfer request that is still being
1719          * processed by the EDMACC or EDMATC. We will busy wait until
1720          * any one of the situations occurs:
1721          *   1. the DMA hardware is idle
1722          *   2. a new transfer request is setup
1723          *   3. we hit the loop limit
1724          */
1725         while (edma_read(echan->ecc, EDMA_CCSTAT) & EDMA_CCSTAT_ACTV) {
1726                 /* check if a new transfer request is setup */
1727                 if (edma_get_position(echan->ecc,
1728                                       echan->slot[0], dst) != pos) {
1729                         break;
1730                 }
1731
1732                 if (!--loop_count) {
1733                         dev_dbg_ratelimited(echan->vchan.chan.device->dev,
1734                                 "%s: timeout waiting for PaRAM update\n",
1735                                 __func__);
1736                         break;
1737                 }
1738
1739                 cpu_relax();
1740         }
1741
1742         /*
1743          * Cyclic is simple. Just subtract pset[0].addr from pos.
1744          *
1745          * We never update edesc->residue in the cyclic case, so we
1746          * can tell the remaining room to the end of the circular
1747          * buffer.
1748          */
1749         if (edesc->cyclic) {
1750                 done = pos - pset->addr;
1751                 edesc->residue_stat = edesc->residue - done;
1752                 return edesc->residue_stat;
1753         }
1754
1755         /*
1756          * For SG operation we catch up with the last processed
1757          * status.
1758          */
1759         pset += edesc->processed_stat;
1760
1761         for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) {
1762                 /*
1763                  * If we are inside this pset address range, we know
1764                  * this is the active one. Get the current delta and
1765                  * stop walking the psets.
1766                  */
1767                 if (pos >= pset->addr && pos < pset->addr + pset->len)
1768                         return edesc->residue_stat - (pos - pset->addr);
1769
1770                 /* Otherwise mark it done and update residue_stat. */
1771                 edesc->processed_stat++;
1772                 edesc->residue_stat -= pset->len;
1773         }
1774         return edesc->residue_stat;
1775 }
1776
1777 /* Check request completion status */
1778 static enum dma_status edma_tx_status(struct dma_chan *chan,
1779                                       dma_cookie_t cookie,
1780                                       struct dma_tx_state *txstate)
1781 {
1782         struct edma_chan *echan = to_edma_chan(chan);
1783         struct virt_dma_desc *vdesc;
1784         enum dma_status ret;
1785         unsigned long flags;
1786
1787         ret = dma_cookie_status(chan, cookie, txstate);
1788         if (ret == DMA_COMPLETE || !txstate)
1789                 return ret;
1790
1791         spin_lock_irqsave(&echan->vchan.lock, flags);
1792         if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie)
1793                 txstate->residue = edma_residue(echan->edesc);
1794         else if ((vdesc = vchan_find_desc(&echan->vchan, cookie)))
1795                 txstate->residue = to_edma_desc(&vdesc->tx)->residue;
1796         spin_unlock_irqrestore(&echan->vchan.lock, flags);
1797
1798         return ret;
1799 }
1800
1801 static bool edma_is_memcpy_channel(int ch_num, s32 *memcpy_channels)
1802 {
1803         if (!memcpy_channels)
1804                 return false;
1805         while (*memcpy_channels != -1) {
1806                 if (*memcpy_channels == ch_num)
1807                         return true;
1808                 memcpy_channels++;
1809         }
1810         return false;
1811 }
1812
1813 #define EDMA_DMA_BUSWIDTHS      (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
1814                                  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
1815                                  BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
1816                                  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
1817
1818 static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode)
1819 {
1820         struct dma_device *s_ddev = &ecc->dma_slave;
1821         struct dma_device *m_ddev = NULL;
1822         s32 *memcpy_channels = ecc->info->memcpy_channels;
1823         int i, j;
1824
1825         dma_cap_zero(s_ddev->cap_mask);
1826         dma_cap_set(DMA_SLAVE, s_ddev->cap_mask);
1827         dma_cap_set(DMA_CYCLIC, s_ddev->cap_mask);
1828         if (ecc->legacy_mode && !memcpy_channels) {
1829                 dev_warn(ecc->dev,
1830                          "Legacy memcpy is enabled, things might not work\n");
1831
1832                 dma_cap_set(DMA_MEMCPY, s_ddev->cap_mask);
1833                 s_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1834                 s_ddev->directions = BIT(DMA_MEM_TO_MEM);
1835         }
1836
1837         s_ddev->device_prep_slave_sg = edma_prep_slave_sg;
1838         s_ddev->device_prep_dma_cyclic = edma_prep_dma_cyclic;
1839         s_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1840         s_ddev->device_free_chan_resources = edma_free_chan_resources;
1841         s_ddev->device_issue_pending = edma_issue_pending;
1842         s_ddev->device_tx_status = edma_tx_status;
1843         s_ddev->device_config = edma_slave_config;
1844         s_ddev->device_pause = edma_dma_pause;
1845         s_ddev->device_resume = edma_dma_resume;
1846         s_ddev->device_terminate_all = edma_terminate_all;
1847         s_ddev->device_synchronize = edma_synchronize;
1848
1849         s_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1850         s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1851         s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV));
1852         s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1853
1854         s_ddev->dev = ecc->dev;
1855         INIT_LIST_HEAD(&s_ddev->channels);
1856
1857         if (memcpy_channels) {
1858                 m_ddev = devm_kzalloc(ecc->dev, sizeof(*m_ddev), GFP_KERNEL);
1859                 ecc->dma_memcpy = m_ddev;
1860
1861                 dma_cap_zero(m_ddev->cap_mask);
1862                 dma_cap_set(DMA_MEMCPY, m_ddev->cap_mask);
1863
1864                 m_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1865                 m_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1866                 m_ddev->device_free_chan_resources = edma_free_chan_resources;
1867                 m_ddev->device_issue_pending = edma_issue_pending;
1868                 m_ddev->device_tx_status = edma_tx_status;
1869                 m_ddev->device_config = edma_slave_config;
1870                 m_ddev->device_pause = edma_dma_pause;
1871                 m_ddev->device_resume = edma_dma_resume;
1872                 m_ddev->device_terminate_all = edma_terminate_all;
1873                 m_ddev->device_synchronize = edma_synchronize;
1874
1875                 m_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1876                 m_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1877                 m_ddev->directions = BIT(DMA_MEM_TO_MEM);
1878                 m_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1879
1880                 m_ddev->dev = ecc->dev;
1881                 INIT_LIST_HEAD(&m_ddev->channels);
1882         } else if (!ecc->legacy_mode) {
1883                 dev_info(ecc->dev, "memcpy is disabled\n");
1884         }
1885
1886         for (i = 0; i < ecc->num_channels; i++) {
1887                 struct edma_chan *echan = &ecc->slave_chans[i];
1888                 echan->ch_num = EDMA_CTLR_CHAN(ecc->id, i);
1889                 echan->ecc = ecc;
1890                 echan->vchan.desc_free = edma_desc_free;
1891
1892                 if (m_ddev && edma_is_memcpy_channel(i, memcpy_channels))
1893                         vchan_init(&echan->vchan, m_ddev);
1894                 else
1895                         vchan_init(&echan->vchan, s_ddev);
1896
1897                 INIT_LIST_HEAD(&echan->node);
1898                 for (j = 0; j < EDMA_MAX_SLOTS; j++)
1899                         echan->slot[j] = -1;
1900         }
1901 }
1902
1903 static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
1904                               struct edma_cc *ecc)
1905 {
1906         int i;
1907         u32 value, cccfg;
1908         s8 (*queue_priority_map)[2];
1909
1910         /* Decode the eDMA3 configuration from CCCFG register */
1911         cccfg = edma_read(ecc, EDMA_CCCFG);
1912
1913         value = GET_NUM_REGN(cccfg);
1914         ecc->num_region = BIT(value);
1915
1916         value = GET_NUM_DMACH(cccfg);
1917         ecc->num_channels = BIT(value + 1);
1918
1919         value = GET_NUM_QDMACH(cccfg);
1920         ecc->num_qchannels = value * 2;
1921
1922         value = GET_NUM_PAENTRY(cccfg);
1923         ecc->num_slots = BIT(value + 4);
1924
1925         value = GET_NUM_EVQUE(cccfg);
1926         ecc->num_tc = value + 1;
1927
1928         ecc->chmap_exist = (cccfg & CHMAP_EXIST) ? true : false;
1929
1930         dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
1931         dev_dbg(dev, "num_region: %u\n", ecc->num_region);
1932         dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
1933         dev_dbg(dev, "num_qchannels: %u\n", ecc->num_qchannels);
1934         dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
1935         dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
1936         dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no");
1937
1938         /* Nothing need to be done if queue priority is provided */
1939         if (pdata->queue_priority_mapping)
1940                 return 0;
1941
1942         /*
1943          * Configure TC/queue priority as follows:
1944          * Q0 - priority 0
1945          * Q1 - priority 1
1946          * Q2 - priority 2
1947          * ...
1948          * The meaning of priority numbers: 0 highest priority, 7 lowest
1949          * priority. So Q0 is the highest priority queue and the last queue has
1950          * the lowest priority.
1951          */
1952         queue_priority_map = devm_kcalloc(dev, ecc->num_tc + 1, sizeof(s8),
1953                                           GFP_KERNEL);
1954         if (!queue_priority_map)
1955                 return -ENOMEM;
1956
1957         for (i = 0; i < ecc->num_tc; i++) {
1958                 queue_priority_map[i][0] = i;
1959                 queue_priority_map[i][1] = i;
1960         }
1961         queue_priority_map[i][0] = -1;
1962         queue_priority_map[i][1] = -1;
1963
1964         pdata->queue_priority_mapping = queue_priority_map;
1965         /* Default queue has the lowest priority */
1966         pdata->default_queue = i - 1;
1967
1968         return 0;
1969 }
1970
1971 #if IS_ENABLED(CONFIG_OF)
1972 static int edma_xbar_event_map(struct device *dev, struct edma_soc_info *pdata,
1973                                size_t sz)
1974 {
1975         const char pname[] = "ti,edma-xbar-event-map";
1976         struct resource res;
1977         void __iomem *xbar;
1978         s16 (*xbar_chans)[2];
1979         size_t nelm = sz / sizeof(s16);
1980         u32 shift, offset, mux;
1981         int ret, i;
1982
1983         xbar_chans = devm_kcalloc(dev, nelm + 2, sizeof(s16), GFP_KERNEL);
1984         if (!xbar_chans)
1985                 return -ENOMEM;
1986
1987         ret = of_address_to_resource(dev->of_node, 1, &res);
1988         if (ret)
1989                 return -ENOMEM;
1990
1991         xbar = devm_ioremap(dev, res.start, resource_size(&res));
1992         if (!xbar)
1993                 return -ENOMEM;
1994
1995         ret = of_property_read_u16_array(dev->of_node, pname, (u16 *)xbar_chans,
1996                                          nelm);
1997         if (ret)
1998                 return -EIO;
1999
2000         /* Invalidate last entry for the other user of this mess */
2001         nelm >>= 1;
2002         xbar_chans[nelm][0] = -1;
2003         xbar_chans[nelm][1] = -1;
2004
2005         for (i = 0; i < nelm; i++) {
2006                 shift = (xbar_chans[i][1] & 0x03) << 3;
2007                 offset = xbar_chans[i][1] & 0xfffffffc;
2008                 mux = readl(xbar + offset);
2009                 mux &= ~(0xff << shift);
2010                 mux |= xbar_chans[i][0] << shift;
2011                 writel(mux, (xbar + offset));
2012         }
2013
2014         pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
2015         return 0;
2016 }
2017
2018 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2019                                                      bool legacy_mode)
2020 {
2021         struct edma_soc_info *info;
2022         struct property *prop;
2023         size_t sz;
2024         int ret;
2025
2026         info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
2027         if (!info)
2028                 return ERR_PTR(-ENOMEM);
2029
2030         if (legacy_mode) {
2031                 prop = of_find_property(dev->of_node, "ti,edma-xbar-event-map",
2032                                         &sz);
2033                 if (prop) {
2034                         ret = edma_xbar_event_map(dev, info, sz);
2035                         if (ret)
2036                                 return ERR_PTR(ret);
2037                 }
2038                 return info;
2039         }
2040
2041         /* Get the list of channels allocated to be used for memcpy */
2042         prop = of_find_property(dev->of_node, "ti,edma-memcpy-channels", &sz);
2043         if (prop) {
2044                 const char pname[] = "ti,edma-memcpy-channels";
2045                 size_t nelm = sz / sizeof(s32);
2046                 s32 *memcpy_ch;
2047
2048                 memcpy_ch = devm_kcalloc(dev, nelm + 1, sizeof(s32),
2049                                          GFP_KERNEL);
2050                 if (!memcpy_ch)
2051                         return ERR_PTR(-ENOMEM);
2052
2053                 ret = of_property_read_u32_array(dev->of_node, pname,
2054                                                  (u32 *)memcpy_ch, nelm);
2055                 if (ret)
2056                         return ERR_PTR(ret);
2057
2058                 memcpy_ch[nelm] = -1;
2059                 info->memcpy_channels = memcpy_ch;
2060         }
2061
2062         prop = of_find_property(dev->of_node, "ti,edma-reserved-slot-ranges",
2063                                 &sz);
2064         if (prop) {
2065                 const char pname[] = "ti,edma-reserved-slot-ranges";
2066                 u32 (*tmp)[2];
2067                 s16 (*rsv_slots)[2];
2068                 size_t nelm = sz / sizeof(*tmp);
2069                 struct edma_rsv_info *rsv_info;
2070                 int i;
2071
2072                 if (!nelm)
2073                         return info;
2074
2075                 tmp = kcalloc(nelm, sizeof(*tmp), GFP_KERNEL);
2076                 if (!tmp)
2077                         return ERR_PTR(-ENOMEM);
2078
2079                 rsv_info = devm_kzalloc(dev, sizeof(*rsv_info), GFP_KERNEL);
2080                 if (!rsv_info) {
2081                         kfree(tmp);
2082                         return ERR_PTR(-ENOMEM);
2083                 }
2084
2085                 rsv_slots = devm_kcalloc(dev, nelm + 1, sizeof(*rsv_slots),
2086                                          GFP_KERNEL);
2087                 if (!rsv_slots) {
2088                         kfree(tmp);
2089                         return ERR_PTR(-ENOMEM);
2090                 }
2091
2092                 ret = of_property_read_u32_array(dev->of_node, pname,
2093                                                  (u32 *)tmp, nelm * 2);
2094                 if (ret) {
2095                         kfree(tmp);
2096                         return ERR_PTR(ret);
2097                 }
2098
2099                 for (i = 0; i < nelm; i++) {
2100                         rsv_slots[i][0] = tmp[i][0];
2101                         rsv_slots[i][1] = tmp[i][1];
2102                 }
2103                 rsv_slots[nelm][0] = -1;
2104                 rsv_slots[nelm][1] = -1;
2105
2106                 info->rsv = rsv_info;
2107                 info->rsv->rsv_slots = (const s16 (*)[2])rsv_slots;
2108
2109                 kfree(tmp);
2110         }
2111
2112         return info;
2113 }
2114
2115 static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2116                                       struct of_dma *ofdma)
2117 {
2118         struct edma_cc *ecc = ofdma->of_dma_data;
2119         struct dma_chan *chan = NULL;
2120         struct edma_chan *echan;
2121         int i;
2122
2123         if (!ecc || dma_spec->args_count < 1)
2124                 return NULL;
2125
2126         for (i = 0; i < ecc->num_channels; i++) {
2127                 echan = &ecc->slave_chans[i];
2128                 if (echan->ch_num == dma_spec->args[0]) {
2129                         chan = &echan->vchan.chan;
2130                         break;
2131                 }
2132         }
2133
2134         if (!chan)
2135                 return NULL;
2136
2137         if (echan->ecc->legacy_mode && dma_spec->args_count == 1)
2138                 goto out;
2139
2140         if (!echan->ecc->legacy_mode && dma_spec->args_count == 2 &&
2141             dma_spec->args[1] < echan->ecc->num_tc) {
2142                 echan->tc = &echan->ecc->tc_list[dma_spec->args[1]];
2143                 goto out;
2144         }
2145
2146         return NULL;
2147 out:
2148         /* The channel is going to be used as HW synchronized */
2149         echan->hw_triggered = true;
2150         return dma_get_slave_channel(chan);
2151 }
2152 #else
2153 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2154                                                      bool legacy_mode)
2155 {
2156         return ERR_PTR(-EINVAL);
2157 }
2158
2159 static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2160                                       struct of_dma *ofdma)
2161 {
2162         return NULL;
2163 }
2164 #endif
2165
2166 static int edma_probe(struct platform_device *pdev)
2167 {
2168         struct edma_soc_info    *info = pdev->dev.platform_data;
2169         s8                      (*queue_priority_mapping)[2];
2170         int                     i, off, ln;
2171         const s16               (*rsv_slots)[2];
2172         const s16               (*xbar_chans)[2];
2173         int                     irq;
2174         char                    *irq_name;
2175         struct resource         *mem;
2176         struct device_node      *node = pdev->dev.of_node;
2177         struct device           *dev = &pdev->dev;
2178         struct edma_cc          *ecc;
2179         bool                    legacy_mode = true;
2180         int ret;
2181
2182         if (node) {
2183                 const struct of_device_id *match;
2184
2185                 match = of_match_node(edma_of_ids, node);
2186                 if (match && (u32)match->data == EDMA_BINDING_TPCC)
2187                         legacy_mode = false;
2188
2189                 info = edma_setup_info_from_dt(dev, legacy_mode);
2190                 if (IS_ERR(info)) {
2191                         dev_err(dev, "failed to get DT data\n");
2192                         return PTR_ERR(info);
2193                 }
2194         }
2195
2196         if (!info)
2197                 return -ENODEV;
2198
2199         pm_runtime_enable(dev);
2200         ret = pm_runtime_get_sync(dev);
2201         if (ret < 0) {
2202                 dev_err(dev, "pm_runtime_get_sync() failed\n");
2203                 return ret;
2204         }
2205
2206         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
2207         if (ret)
2208                 return ret;
2209
2210         ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
2211         if (!ecc) {
2212                 dev_err(dev, "Can't allocate controller\n");
2213                 return -ENOMEM;
2214         }
2215
2216         ecc->dev = dev;
2217         ecc->id = pdev->id;
2218         ecc->legacy_mode = legacy_mode;
2219         /* When booting with DT the pdev->id is -1 */
2220         if (ecc->id < 0)
2221                 ecc->id = 0;
2222
2223         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
2224         if (!mem) {
2225                 dev_dbg(dev, "mem resource not found, using index 0\n");
2226                 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2227                 if (!mem) {
2228                         dev_err(dev, "no mem resource?\n");
2229                         return -ENODEV;
2230                 }
2231         }
2232         ecc->base = devm_ioremap_resource(dev, mem);
2233         if (IS_ERR(ecc->base))
2234                 return PTR_ERR(ecc->base);
2235
2236         platform_set_drvdata(pdev, ecc);
2237
2238         /* Get eDMA3 configuration from IP */
2239         ret = edma_setup_from_hw(dev, info, ecc);
2240         if (ret)
2241                 return ret;
2242
2243         /* Allocate memory based on the information we got from the IP */
2244         ecc->slave_chans = devm_kcalloc(dev, ecc->num_channels,
2245                                         sizeof(*ecc->slave_chans), GFP_KERNEL);
2246         if (!ecc->slave_chans)
2247                 return -ENOMEM;
2248
2249         ecc->slot_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots),
2250                                        sizeof(unsigned long), GFP_KERNEL);
2251         if (!ecc->slot_inuse)
2252                 return -ENOMEM;
2253
2254         ecc->default_queue = info->default_queue;
2255
2256         for (i = 0; i < ecc->num_slots; i++)
2257                 edma_write_slot(ecc, i, &dummy_paramset);
2258
2259         if (info->rsv) {
2260                 /* Set the reserved slots in inuse list */
2261                 rsv_slots = info->rsv->rsv_slots;
2262                 if (rsv_slots) {
2263                         for (i = 0; rsv_slots[i][0] != -1; i++) {
2264                                 off = rsv_slots[i][0];
2265                                 ln = rsv_slots[i][1];
2266                                 set_bits(off, ln, ecc->slot_inuse);
2267                         }
2268                 }
2269         }
2270
2271         /* Clear the xbar mapped channels in unused list */
2272         xbar_chans = info->xbar_chans;
2273         if (xbar_chans) {
2274                 for (i = 0; xbar_chans[i][1] != -1; i++) {
2275                         off = xbar_chans[i][1];
2276                 }
2277         }
2278
2279         irq = platform_get_irq_byname(pdev, "edma3_ccint");
2280         if (irq < 0 && node)
2281                 irq = irq_of_parse_and_map(node, 0);
2282
2283         if (irq >= 0) {
2284                 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
2285                                           dev_name(dev));
2286                 ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
2287                                        ecc);
2288                 if (ret) {
2289                         dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
2290                         return ret;
2291                 }
2292         }
2293
2294         irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
2295         if (irq < 0 && node)
2296                 irq = irq_of_parse_and_map(node, 2);
2297
2298         if (irq >= 0) {
2299                 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
2300                                           dev_name(dev));
2301                 ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
2302                                        ecc);
2303                 if (ret) {
2304                         dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
2305                         return ret;
2306                 }
2307         }
2308
2309         ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
2310         if (ecc->dummy_slot < 0) {
2311                 dev_err(dev, "Can't allocate PaRAM dummy slot\n");
2312                 return ecc->dummy_slot;
2313         }
2314
2315         queue_priority_mapping = info->queue_priority_mapping;
2316
2317         if (!ecc->legacy_mode) {
2318                 int lowest_priority = 0;
2319                 struct of_phandle_args tc_args;
2320
2321                 ecc->tc_list = devm_kcalloc(dev, ecc->num_tc,
2322                                             sizeof(*ecc->tc_list), GFP_KERNEL);
2323                 if (!ecc->tc_list)
2324                         return -ENOMEM;
2325
2326                 for (i = 0;; i++) {
2327                         ret = of_parse_phandle_with_fixed_args(node, "ti,tptcs",
2328                                                                1, i, &tc_args);
2329                         if (ret || i == ecc->num_tc)
2330                                 break;
2331
2332                         ecc->tc_list[i].node = tc_args.np;
2333                         ecc->tc_list[i].id = i;
2334                         queue_priority_mapping[i][1] = tc_args.args[0];
2335                         if (queue_priority_mapping[i][1] > lowest_priority) {
2336                                 lowest_priority = queue_priority_mapping[i][1];
2337                                 info->default_queue = i;
2338                         }
2339                 }
2340         }
2341
2342         /* Event queue priority mapping */
2343         for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2344                 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2345                                               queue_priority_mapping[i][1]);
2346
2347         for (i = 0; i < ecc->num_region; i++) {
2348                 edma_write_array2(ecc, EDMA_DRAE, i, 0, 0x0);
2349                 edma_write_array2(ecc, EDMA_DRAE, i, 1, 0x0);
2350                 edma_write_array(ecc, EDMA_QRAE, i, 0x0);
2351         }
2352         ecc->info = info;
2353
2354         /* Init the dma device and channels */
2355         edma_dma_init(ecc, legacy_mode);
2356
2357         for (i = 0; i < ecc->num_channels; i++) {
2358                 /* Assign all channels to the default queue */
2359                 edma_assign_channel_eventq(&ecc->slave_chans[i],
2360                                            info->default_queue);
2361                 /* Set entry slot to the dummy slot */
2362                 edma_set_chmap(&ecc->slave_chans[i], ecc->dummy_slot);
2363         }
2364
2365         ecc->dma_slave.filter.map = info->slave_map;
2366         ecc->dma_slave.filter.mapcnt = info->slavecnt;
2367         ecc->dma_slave.filter.fn = edma_filter_fn;
2368
2369         ret = dma_async_device_register(&ecc->dma_slave);
2370         if (ret) {
2371                 dev_err(dev, "slave ddev registration failed (%d)\n", ret);
2372                 goto err_reg1;
2373         }
2374
2375         if (ecc->dma_memcpy) {
2376                 ret = dma_async_device_register(ecc->dma_memcpy);
2377                 if (ret) {
2378                         dev_err(dev, "memcpy ddev registration failed (%d)\n",
2379                                 ret);
2380                         dma_async_device_unregister(&ecc->dma_slave);
2381                         goto err_reg1;
2382                 }
2383         }
2384
2385         if (node)
2386                 of_dma_controller_register(node, of_edma_xlate, ecc);
2387
2388         dev_info(dev, "TI EDMA DMA engine driver\n");
2389
2390         return 0;
2391
2392 err_reg1:
2393         edma_free_slot(ecc, ecc->dummy_slot);
2394         return ret;
2395 }
2396
2397 static int edma_remove(struct platform_device *pdev)
2398 {
2399         struct device *dev = &pdev->dev;
2400         struct edma_cc *ecc = dev_get_drvdata(dev);
2401
2402         if (dev->of_node)
2403                 of_dma_controller_free(dev->of_node);
2404         dma_async_device_unregister(&ecc->dma_slave);
2405         if (ecc->dma_memcpy)
2406                 dma_async_device_unregister(ecc->dma_memcpy);
2407         edma_free_slot(ecc, ecc->dummy_slot);
2408
2409         return 0;
2410 }
2411
2412 #ifdef CONFIG_PM_SLEEP
2413 static int edma_pm_suspend(struct device *dev)
2414 {
2415         struct edma_cc *ecc = dev_get_drvdata(dev);
2416         struct edma_chan *echan = ecc->slave_chans;
2417         int i;
2418
2419         for (i = 0; i < ecc->num_channels; i++) {
2420                 if (echan[i].alloced) {
2421                         edma_setup_interrupt(&echan[i], false);
2422                         edma_tc_set_pm_state(echan[i].tc, false);
2423                 }
2424         }
2425
2426         return 0;
2427 }
2428
2429 static int edma_pm_resume(struct device *dev)
2430 {
2431         struct edma_cc *ecc = dev_get_drvdata(dev);
2432         struct edma_chan *echan = ecc->slave_chans;
2433         int i;
2434         s8 (*queue_priority_mapping)[2];
2435
2436         queue_priority_mapping = ecc->info->queue_priority_mapping;
2437
2438         /* Event queue priority mapping */
2439         for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2440                 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2441                                               queue_priority_mapping[i][1]);
2442
2443         for (i = 0; i < ecc->num_channels; i++) {
2444                 if (echan[i].alloced) {
2445                         /* ensure access through shadow region 0 */
2446                         edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
2447                                        BIT(i & 0x1f));
2448
2449                         edma_setup_interrupt(&echan[i], true);
2450
2451                         /* Set up channel -> slot mapping for the entry slot */
2452                         edma_set_chmap(&echan[i], echan[i].slot[0]);
2453
2454                         edma_tc_set_pm_state(echan[i].tc, true);
2455                 }
2456         }
2457
2458         return 0;
2459 }
2460 #endif
2461
2462 static const struct dev_pm_ops edma_pm_ops = {
2463         SET_LATE_SYSTEM_SLEEP_PM_OPS(edma_pm_suspend, edma_pm_resume)
2464 };
2465
2466 static struct platform_driver edma_driver = {
2467         .probe          = edma_probe,
2468         .remove         = edma_remove,
2469         .driver = {
2470                 .name   = "edma",
2471                 .pm     = &edma_pm_ops,
2472                 .of_match_table = edma_of_ids,
2473         },
2474 };
2475
2476 static int edma_tptc_probe(struct platform_device *pdev)
2477 {
2478         return 0;
2479 }
2480
2481 static struct platform_driver edma_tptc_driver = {
2482         .probe          = edma_tptc_probe,
2483         .driver = {
2484                 .name   = "edma3-tptc",
2485                 .of_match_table = edma_tptc_of_ids,
2486         },
2487 };
2488
2489 bool edma_filter_fn(struct dma_chan *chan, void *param)
2490 {
2491         bool match = false;
2492
2493         if (chan->device->dev->driver == &edma_driver.driver) {
2494                 struct edma_chan *echan = to_edma_chan(chan);
2495                 unsigned ch_req = *(unsigned *)param;
2496                 if (ch_req == echan->ch_num) {
2497                         /* The channel is going to be used as HW synchronized */
2498                         echan->hw_triggered = true;
2499                         match = true;
2500                 }
2501         }
2502         return match;
2503 }
2504 EXPORT_SYMBOL(edma_filter_fn);
2505
2506 static int edma_init(void)
2507 {
2508         int ret;
2509
2510         ret = platform_driver_register(&edma_tptc_driver);
2511         if (ret)
2512                 return ret;
2513
2514         return platform_driver_register(&edma_driver);
2515 }
2516 subsys_initcall(edma_init);
2517
2518 static void __exit edma_exit(void)
2519 {
2520         platform_driver_unregister(&edma_driver);
2521         platform_driver_unregister(&edma_tptc_driver);
2522 }
2523 module_exit(edma_exit);
2524
2525 MODULE_AUTHOR("Matt Porter <[email protected]>");
2526 MODULE_DESCRIPTION("TI EDMA DMA engine driver");
2527 MODULE_LICENSE("GPL v2");