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         unsigned int                    ccint;
 243         unsigned int                    ccerrint;
 244
 245         /*
 246          * The slot_inuse bit for each PaRAM slot is clear unless the slot is
 247          * in use by Linux or if it is allocated to be used by DSP.
 248          */
 249         unsigned long *slot_inuse;
 250
 251         struct dma_device               dma_slave;
 252         struct dma_device               *dma_memcpy;
 253         struct edma_chan                *slave_chans;
 254         struct edma_tc                  *tc_list;
 255         int                             dummy_slot;
 256 };
 257
 258 /* dummy param set used to (re)initialize parameter RAM slots */
 259 static const struct edmacc_param dummy_paramset = {
 260         .link_bcntrld = 0xffff,
 261         .ccnt = 1,
 262 };
 263
 264 #define EDMA_BINDING_LEGACY     0
 265 #define EDMA_BINDING_TPCC       1
 266 static const u32 edma_binding_type[] = {
 267         [EDMA_BINDING_LEGACY] = EDMA_BINDING_LEGACY,
 268         [EDMA_BINDING_TPCC] = EDMA_BINDING_TPCC,
 269 };
 270
 271 static const struct of_device_id edma_of_ids[] = {
 272         {
 273                 .compatible = "ti,edma3",
 274                 .data = &edma_binding_type[EDMA_BINDING_LEGACY],
 275         },
 276         {
 277                 .compatible = "ti,edma3-tpcc",
 278                 .data = &edma_binding_type[EDMA_BINDING_TPCC],
 279         },
 280         {}
 281 };
 282 MODULE_DEVICE_TABLE(of, edma_of_ids);
 283
 284 static const struct of_device_id edma_tptc_of_ids[] = {
 285         { .compatible = "ti,edma3-tptc", },
 286         {}
 287 };
 288 MODULE_DEVICE_TABLE(of, edma_tptc_of_ids);
 289
 290 static inline unsigned int edma_read(struct edma_cc *ecc, int offset)
 291 {
 292         return (unsigned int)__raw_readl(ecc->base + offset);
 293 }
 294
 295 static inline void edma_write(struct edma_cc *ecc, int offset, int val)
 296 {
 297         __raw_writel(val, ecc->base + offset);
 298 }
 299
 300 static inline void edma_modify(struct edma_cc *ecc, int offset, unsigned and,
 301                                unsigned or)
 302 {
 303         unsigned val = edma_read(ecc, offset);
 304
 305         val &= and;
 306         val |= or;
 307         edma_write(ecc, offset, val);
 308 }
 309
 310 static inline void edma_and(struct edma_cc *ecc, int offset, unsigned and)
 311 {
 312         unsigned val = edma_read(ecc, offset);
 313
 314         val &= and;
 315         edma_write(ecc, offset, val);
 316 }
 317
 318 static inline void edma_or(struct edma_cc *ecc, int offset, unsigned or)
 319 {
 320         unsigned val = edma_read(ecc, offset);
 321
 322         val |= or;
 323         edma_write(ecc, offset, val);
 324 }
 325
 326 static inline unsigned int edma_read_array(struct edma_cc *ecc, int offset,
 327                                            int i)
 328 {
 329         return edma_read(ecc, offset + (i << 2));
 330 }
 331
 332 static inline void edma_write_array(struct edma_cc *ecc, int offset, int i,
 333                                     unsigned val)
 334 {
 335         edma_write(ecc, offset + (i << 2), val);
 336 }
 337
 338 static inline void edma_modify_array(struct edma_cc *ecc, int offset, int i,
 339                                      unsigned and, unsigned or)
 340 {
 341         edma_modify(ecc, offset + (i << 2), and, or);
 342 }
 343
 344 static inline void edma_or_array(struct edma_cc *ecc, int offset, int i,
 345                                  unsigned or)
 346 {
 347         edma_or(ecc, offset + (i << 2), or);
 348 }
 349
 350 static inline void edma_or_array2(struct edma_cc *ecc, int offset, int i, int j,
 351                                   unsigned or)
 352 {
 353         edma_or(ecc, offset + ((i * 2 + j) << 2), or);
 354 }
 355
 356 static inline void edma_write_array2(struct edma_cc *ecc, int offset, int i,
 357                                      int j, unsigned val)
 358 {
 359         edma_write(ecc, offset + ((i * 2 + j) << 2), val);
 360 }
 361
 362 static inline unsigned int edma_shadow0_read(struct edma_cc *ecc, int offset)
 363 {
 364         return edma_read(ecc, EDMA_SHADOW0 + offset);
 365 }
 366
 367 static inline unsigned int edma_shadow0_read_array(struct edma_cc *ecc,
 368                                                    int offset, int i)
 369 {
 370         return edma_read(ecc, EDMA_SHADOW0 + offset + (i << 2));
 371 }
 372
 373 static inline void edma_shadow0_write(struct edma_cc *ecc, int offset,
 374                                       unsigned val)
 375 {
 376         edma_write(ecc, EDMA_SHADOW0 + offset, val);
 377 }
 378
 379 static inline void edma_shadow0_write_array(struct edma_cc *ecc, int offset,
 380                                             int i, unsigned val)
 381 {
 382         edma_write(ecc, EDMA_SHADOW0 + offset + (i << 2), val);
 383 }
 384
 385 static inline unsigned int edma_param_read(struct edma_cc *ecc, int offset,
 386                                            int param_no)
 387 {
 388         return edma_read(ecc, EDMA_PARM + offset + (param_no << 5));
 389 }
 390
 391 static inline void edma_param_write(struct edma_cc *ecc, int offset,
 392                                     int param_no, unsigned val)
 393 {
 394         edma_write(ecc, EDMA_PARM + offset + (param_no << 5), val);
 395 }
 396
 397 static inline void edma_param_modify(struct edma_cc *ecc, int offset,
 398                                      int param_no, unsigned and, unsigned or)
 399 {
 400         edma_modify(ecc, EDMA_PARM + offset + (param_no << 5), and, or);
 401 }
 402
 403 static inline void edma_param_and(struct edma_cc *ecc, int offset, int param_no,
 404                                   unsigned and)
 405 {
 406         edma_and(ecc, EDMA_PARM + offset + (param_no << 5), and);
 407 }
 408
 409 static inline void edma_param_or(struct edma_cc *ecc, int offset, int param_no,
 410                                  unsigned or)
 411 {
 412         edma_or(ecc, EDMA_PARM + offset + (param_no << 5), or);
 413 }
 414
 415 static inline void edma_set_bits(int offset, int len, unsigned long *p)
 416 {
 417         for (; len > 0; len--)
 418                 set_bit(offset + (len - 1), p);
 419 }
 420
 421 static void edma_assign_priority_to_queue(struct edma_cc *ecc, int queue_no,
 422                                           int priority)
 423 {
 424         int bit = queue_no * 4;
 425
 426         edma_modify(ecc, EDMA_QUEPRI, ~(0x7 << bit), ((priority & 0x7) << bit));
 427 }
 428
 429 static void edma_set_chmap(struct edma_chan *echan, int slot)
 430 {
 431         struct edma_cc *ecc = echan->ecc;
 432         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 433
 434         if (ecc->chmap_exist) {
 435                 slot = EDMA_CHAN_SLOT(slot);
 436                 edma_write_array(ecc, EDMA_DCHMAP, channel, (slot << 5));
 437         }
 438 }
 439
 440 static void edma_setup_interrupt(struct edma_chan *echan, bool enable)
 441 {
 442         struct edma_cc *ecc = echan->ecc;
 443         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 444
 445         if (enable) {
 446                 edma_shadow0_write_array(ecc, SH_ICR, channel >> 5,
 447                                          BIT(channel & 0x1f));
 448                 edma_shadow0_write_array(ecc, SH_IESR, channel >> 5,
 449                                          BIT(channel & 0x1f));
 450         } else {
 451                 edma_shadow0_write_array(ecc, SH_IECR, channel >> 5,
 452                                          BIT(channel & 0x1f));
 453         }
 454 }
 455
 456 /*
 457  * paRAM slot management functions
 458  */
 459 static void edma_write_slot(struct edma_cc *ecc, unsigned slot,
 460                             const struct edmacc_param *param)
 461 {
 462         slot = EDMA_CHAN_SLOT(slot);
 463         if (slot >= ecc->num_slots)
 464                 return;
 465         memcpy_toio(ecc->base + PARM_OFFSET(slot), param, PARM_SIZE);
 466 }
 467
 468 static int edma_read_slot(struct edma_cc *ecc, unsigned slot,
 469                            struct edmacc_param *param)
 470 {
 471         slot = EDMA_CHAN_SLOT(slot);
 472         if (slot >= ecc->num_slots)
 473                 return -EINVAL;
 474         memcpy_fromio(param, ecc->base + PARM_OFFSET(slot), PARM_SIZE);
 475
 476         return 0;
 477 }
 478
 479 /**
 480  * edma_alloc_slot - allocate DMA parameter RAM
 481  * @ecc: pointer to edma_cc struct
 482  * @slot: specific slot to allocate; negative for "any unused slot"
 483  *
 484  * This allocates a parameter RAM slot, initializing it to hold a
 485  * dummy transfer.  Slots allocated using this routine have not been
 486  * mapped to a hardware DMA channel, and will normally be used by
 487  * linking to them from a slot associated with a DMA channel.
 488  *
 489  * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
 490  * slots may be allocated on behalf of DSP firmware.
 491  *
 492  * Returns the number of the slot, else negative errno.
 493  */
 494 static int edma_alloc_slot(struct edma_cc *ecc, int slot)
 495 {
 496         if (slot >= 0) {
 497                 slot = EDMA_CHAN_SLOT(slot);
 498                 /* Requesting entry paRAM slot for a HW triggered channel. */
 499                 if (ecc->chmap_exist && slot < ecc->num_channels)
 500                         slot = EDMA_SLOT_ANY;
 501         }
 502
 503         if (slot < 0) {
 504                 if (ecc->chmap_exist)
 505                         slot = 0;
 506                 else
 507                         slot = ecc->num_channels;
 508                 for (;;) {
 509                         slot = find_next_zero_bit(ecc->slot_inuse,
 510                                                   ecc->num_slots,
 511                                                   slot);
 512                         if (slot == ecc->num_slots)
 513                                 return -ENOMEM;
 514                         if (!test_and_set_bit(slot, ecc->slot_inuse))
 515                                 break;
 516                 }
 517         } else if (slot >= ecc->num_slots) {
 518                 return -EINVAL;
 519         } else if (test_and_set_bit(slot, ecc->slot_inuse)) {
 520                 return -EBUSY;
 521         }
 522
 523         edma_write_slot(ecc, slot, &dummy_paramset);
 524
 525         return EDMA_CTLR_CHAN(ecc->id, slot);
 526 }
 527
 528 static void edma_free_slot(struct edma_cc *ecc, unsigned slot)
 529 {
 530         slot = EDMA_CHAN_SLOT(slot);
 531         if (slot >= ecc->num_slots)
 532                 return;
 533
 534         edma_write_slot(ecc, slot, &dummy_paramset);
 535         clear_bit(slot, ecc->slot_inuse);
 536 }
 537
 538 /**
 539  * edma_link - link one parameter RAM slot to another
 540  * @ecc: pointer to edma_cc struct
 541  * @from: parameter RAM slot originating the link
 542  * @to: parameter RAM slot which is the link target
 543  *
 544  * The originating slot should not be part of any active DMA transfer.
 545  */
 546 static void edma_link(struct edma_cc *ecc, unsigned from, unsigned to)
 547 {
 548         if (unlikely(EDMA_CTLR(from) != EDMA_CTLR(to)))
 549                 dev_warn(ecc->dev, "Ignoring eDMA instance for linking\n");
 550
 551         from = EDMA_CHAN_SLOT(from);
 552         to = EDMA_CHAN_SLOT(to);
 553         if (from >= ecc->num_slots || to >= ecc->num_slots)
 554                 return;
 555
 556         edma_param_modify(ecc, PARM_LINK_BCNTRLD, from, 0xffff0000,
 557                           PARM_OFFSET(to));
 558 }
 559
 560 /**
 561  * edma_get_position - returns the current transfer point
 562  * @ecc: pointer to edma_cc struct
 563  * @slot: parameter RAM slot being examined
 564  * @dst:  true selects the dest position, false the source
 565  *
 566  * Returns the position of the current active slot
 567  */
 568 static dma_addr_t edma_get_position(struct edma_cc *ecc, unsigned slot,
 569                                     bool dst)
 570 {
 571         u32 offs;
 572
 573         slot = EDMA_CHAN_SLOT(slot);
 574         offs = PARM_OFFSET(slot);
 575         offs += dst ? PARM_DST : PARM_SRC;
 576
 577         return edma_read(ecc, offs);
 578 }
 579
 580 /*
 581  * Channels with event associations will be triggered by their hardware
 582  * events, and channels without such associations will be triggered by
 583  * software.  (At this writing there is no interface for using software
 584  * triggers except with channels that don't support hardware triggers.)
 585  */
 586 static void edma_start(struct edma_chan *echan)
 587 {
 588         struct edma_cc *ecc = echan->ecc;
 589         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 590         int j = (channel >> 5);
 591         unsigned int mask = BIT(channel & 0x1f);
 592
 593         if (!echan->hw_triggered) {
 594                 /* EDMA channels without event association */
 595                 dev_dbg(ecc->dev, "ESR%d %08x\n", j,
 596                         edma_shadow0_read_array(ecc, SH_ESR, j));
 597                 edma_shadow0_write_array(ecc, SH_ESR, j, mask);
 598         } else {
 599                 /* EDMA channel with event association */
 600                 dev_dbg(ecc->dev, "ER%d %08x\n", j,
 601                         edma_shadow0_read_array(ecc, SH_ER, j));
 602                 /* Clear any pending event or error */
 603                 edma_write_array(ecc, EDMA_ECR, j, mask);
 604                 edma_write_array(ecc, EDMA_EMCR, j, mask);
 605                 /* Clear any SER */
 606                 edma_shadow0_write_array(ecc, SH_SECR, j, mask);
 607                 edma_shadow0_write_array(ecc, SH_EESR, j, mask);
 608                 dev_dbg(ecc->dev, "EER%d %08x\n", j,
 609                         edma_shadow0_read_array(ecc, SH_EER, j));
 610         }
 611 }
 612
 613 static void edma_stop(struct edma_chan *echan)
 614 {
 615         struct edma_cc *ecc = echan->ecc;
 616         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 617         int j = (channel >> 5);
 618         unsigned int mask = BIT(channel & 0x1f);
 619
 620         edma_shadow0_write_array(ecc, SH_EECR, j, mask);
 621         edma_shadow0_write_array(ecc, SH_ECR, j, mask);
 622         edma_shadow0_write_array(ecc, SH_SECR, j, mask);
 623         edma_write_array(ecc, EDMA_EMCR, j, mask);
 624
 625         /* clear possibly pending completion interrupt */
 626         edma_shadow0_write_array(ecc, SH_ICR, j, mask);
 627
 628         dev_dbg(ecc->dev, "EER%d %08x\n", j,
 629                 edma_shadow0_read_array(ecc, SH_EER, j));
 630
 631         /* REVISIT:  consider guarding against inappropriate event
 632          * chaining by overwriting with dummy_paramset.
 633          */
 634 }
 635
 636 /*
 637  * Temporarily disable EDMA hardware events on the specified channel,
 638  * preventing them from triggering new transfers
 639  */
 640 static void edma_pause(struct edma_chan *echan)
 641 {
 642         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 643         unsigned int mask = BIT(channel & 0x1f);
 644
 645         edma_shadow0_write_array(echan->ecc, SH_EECR, channel >> 5, mask);
 646 }
 647
 648 /* Re-enable EDMA hardware events on the specified channel.  */
 649 static void edma_resume(struct edma_chan *echan)
 650 {
 651         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 652         unsigned int mask = BIT(channel & 0x1f);
 653
 654         edma_shadow0_write_array(echan->ecc, SH_EESR, channel >> 5, mask);
 655 }
 656
 657 static void edma_trigger_channel(struct edma_chan *echan)
 658 {
 659         struct edma_cc *ecc = echan->ecc;
 660         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 661         unsigned int mask = BIT(channel & 0x1f);
 662
 663         edma_shadow0_write_array(ecc, SH_ESR, (channel >> 5), mask);
 664
 665         dev_dbg(ecc->dev, "ESR%d %08x\n", (channel >> 5),
 666                 edma_shadow0_read_array(ecc, SH_ESR, (channel >> 5)));
 667 }
 668
 669 static void edma_clean_channel(struct edma_chan *echan)
 670 {
 671         struct edma_cc *ecc = echan->ecc;
 672         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 673         int j = (channel >> 5);
 674         unsigned int mask = BIT(channel & 0x1f);
 675
 676         dev_dbg(ecc->dev, "EMR%d %08x\n", j, edma_read_array(ecc, EDMA_EMR, j));
 677         edma_shadow0_write_array(ecc, SH_ECR, j, mask);
 678         /* Clear the corresponding EMR bits */
 679         edma_write_array(ecc, EDMA_EMCR, j, mask);
 680         /* Clear any SER */
 681         edma_shadow0_write_array(ecc, SH_SECR, j, mask);
 682         edma_write(ecc, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
 683 }
 684
 685 /* Move channel to a specific event queue */
 686 static void edma_assign_channel_eventq(struct edma_chan *echan,
 687                                        enum dma_event_q eventq_no)
 688 {
 689         struct edma_cc *ecc = echan->ecc;
 690         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 691         int bit = (channel & 0x7) * 4;
 692
 693         /* default to low priority queue */
 694         if (eventq_no == EVENTQ_DEFAULT)
 695                 eventq_no = ecc->default_queue;
 696         if (eventq_no >= ecc->num_tc)
 697                 return;
 698
 699         eventq_no &= 7;
 700         edma_modify_array(ecc, EDMA_DMAQNUM, (channel >> 3), ~(0x7 << bit),
 701                           eventq_no << bit);
 702 }
 703
 704 static int edma_alloc_channel(struct edma_chan *echan,
 705                               enum dma_event_q eventq_no)
 706 {
 707         struct edma_cc *ecc = echan->ecc;
 708         int channel = EDMA_CHAN_SLOT(echan->ch_num);
 709
 710         /* ensure access through shadow region 0 */
 711         edma_or_array2(ecc, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
 712
 713         /* ensure no events are pending */
 714         edma_stop(echan);
 715
 716         edma_setup_interrupt(echan, true);
 717
 718         edma_assign_channel_eventq(echan, eventq_no);
 719
 720         return 0;
 721 }
 722
 723 static void edma_free_channel(struct edma_chan *echan)
 724 {
 725         /* ensure no events are pending */
 726         edma_stop(echan);
 727         /* REVISIT should probably take out of shadow region 0 */
 728         edma_setup_interrupt(echan, false);
 729 }
 730
 731 static inline struct edma_cc *to_edma_cc(struct dma_device *d)
 732 {
 733         return container_of(d, struct edma_cc, dma_slave);
 734 }
 735
 736 static inline struct edma_chan *to_edma_chan(struct dma_chan *c)
 737 {
 738         return container_of(c, struct edma_chan, vchan.chan);
 739 }
 740
 741 static inline struct edma_desc *to_edma_desc(struct dma_async_tx_descriptor *tx)
 742 {
 743         return container_of(tx, struct edma_desc, vdesc.tx);
 744 }
 745
 746 static void edma_desc_free(struct virt_dma_desc *vdesc)
 747 {
 748         kfree(container_of(vdesc, struct edma_desc, vdesc));
 749 }
 750
 751 /* Dispatch a queued descriptor to the controller (caller holds lock) */
 752 static void edma_execute(struct edma_chan *echan)
 753 {
 754         struct edma_cc *ecc = echan->ecc;
 755         struct virt_dma_desc *vdesc;
 756         struct edma_desc *edesc;
 757         struct device *dev = echan->vchan.chan.device->dev;
 758         int i, j, left, nslots;
 759
 760         if (!echan->edesc) {
 761                 /* Setup is needed for the first transfer */
 762                 vdesc = vchan_next_desc(&echan->vchan);
 763                 if (!vdesc)
 764                         return;
 765                 list_del(&vdesc->node);
 766                 echan->edesc = to_edma_desc(&vdesc->tx);
 767         }
 768
 769         edesc = echan->edesc;
 770
 771         /* Find out how many left */
 772         left = edesc->pset_nr - edesc->processed;
 773         nslots = min(MAX_NR_SG, left);
 774         edesc->sg_len = 0;
 775
 776         /* Write descriptor PaRAM set(s) */
 777         for (i = 0; i < nslots; i++) {
 778                 j = i + edesc->processed;
 779                 edma_write_slot(ecc, echan->slot[i], &edesc->pset[j].param);
 780                 edesc->sg_len += edesc->pset[j].len;
 781                 dev_vdbg(dev,
 782                          "\n pset[%d]:\n"
 783                          "  chnum\t%d\n"
 784                          "  slot\t%d\n"
 785                          "  opt\t%08x\n"
 786                          "  src\t%08x\n"
 787                          "  dst\t%08x\n"
 788                          "  abcnt\t%08x\n"
 789                          "  ccnt\t%08x\n"
 790                          "  bidx\t%08x\n"
 791                          "  cidx\t%08x\n"
 792                          "  lkrld\t%08x\n",
 793                          j, echan->ch_num, echan->slot[i],
 794                          edesc->pset[j].param.opt,
 795                          edesc->pset[j].param.src,
 796                          edesc->pset[j].param.dst,
 797                          edesc->pset[j].param.a_b_cnt,
 798                          edesc->pset[j].param.ccnt,
 799                          edesc->pset[j].param.src_dst_bidx,
 800                          edesc->pset[j].param.src_dst_cidx,
 801                          edesc->pset[j].param.link_bcntrld);
 802                 /* Link to the previous slot if not the last set */
 803                 if (i != (nslots - 1))
 804                         edma_link(ecc, echan->slot[i], echan->slot[i + 1]);
 805         }
 806
 807         edesc->processed += nslots;
 808
 809         /*
 810          * If this is either the last set in a set of SG-list transactions
 811          * then setup a link to the dummy slot, this results in all future
 812          * events being absorbed and that's OK because we're done
 813          */
 814         if (edesc->processed == edesc->pset_nr) {
 815                 if (edesc->cyclic)
 816                         edma_link(ecc, echan->slot[nslots - 1], echan->slot[1]);
 817                 else
 818                         edma_link(ecc, echan->slot[nslots - 1],
 819                                   echan->ecc->dummy_slot);
 820         }
 821
 822         if (echan->missed) {
 823                 /*
 824                  * This happens due to setup times between intermediate
 825                  * transfers in long SG lists which have to be broken up into
 826                  * transfers of MAX_NR_SG
 827                  */
 828                 dev_dbg(dev, "missed event on channel %d\n", echan->ch_num);
 829                 edma_clean_channel(echan);
 830                 edma_stop(echan);
 831                 edma_start(echan);
 832                 edma_trigger_channel(echan);
 833                 echan->missed = 0;
 834         } else if (edesc->processed <= MAX_NR_SG) {
 835                 dev_dbg(dev, "first transfer starting on channel %d\n",
 836                         echan->ch_num);
 837                 edma_start(echan);
 838         } else {
 839                 dev_dbg(dev, "chan: %d: completed %d elements, resuming\n",
 840                         echan->ch_num, edesc->processed);
 841                 edma_resume(echan);
 842         }
 843 }
 844
 845 static int edma_terminate_all(struct dma_chan *chan)
 846 {
 847         struct edma_chan *echan = to_edma_chan(chan);
 848         unsigned long flags;
 849         LIST_HEAD(head);
 850
 851         spin_lock_irqsave(&echan->vchan.lock, flags);
 852
 853         /*
 854          * Stop DMA activity: we assume the callback will not be called
 855          * after edma_dma() returns (even if it does, it will see
 856          * echan->edesc is NULL and exit.)
 857          */
 858         if (echan->edesc) {
 859                 edma_stop(echan);
 860                 /* Move the cyclic channel back to default queue */
 861                 if (!echan->tc && echan->edesc->cyclic)
 862                         edma_assign_channel_eventq(echan, EVENTQ_DEFAULT);
 863                 /*
 864                  * free the running request descriptor
 865                  * since it is not in any of the vdesc lists
 866                  */
 867                 edma_desc_free(&echan->edesc->vdesc);
 868                 echan->edesc = NULL;
 869         }
 870
 871         vchan_get_all_descriptors(&echan->vchan, &head);
 872         spin_unlock_irqrestore(&echan->vchan.lock, flags);
 873         vchan_dma_desc_free_list(&echan->vchan, &head);
 874
 875         return 0;
 876 }
 877
 878 static void edma_synchronize(struct dma_chan *chan)
 879 {
 880         struct edma_chan *echan = to_edma_chan(chan);
 881
 882         vchan_synchronize(&echan->vchan);
 883 }
 884
 885 static int edma_slave_config(struct dma_chan *chan,
 886         struct dma_slave_config *cfg)
 887 {
 888         struct edma_chan *echan = to_edma_chan(chan);
 889
 890         if (cfg->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES ||
 891             cfg->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES)
 892                 return -EINVAL;
 893
 894         if (cfg->src_maxburst > chan->device->max_burst ||
 895             cfg->dst_maxburst > chan->device->max_burst)
 896                 return -EINVAL;
 897
 898         memcpy(&echan->cfg, cfg, sizeof(echan->cfg));
 899
 900         return 0;
 901 }
 902
 903 static int edma_dma_pause(struct dma_chan *chan)
 904 {
 905         struct edma_chan *echan = to_edma_chan(chan);
 906
 907         if (!echan->edesc)
 908                 return -EINVAL;
 909
 910         edma_pause(echan);
 911         return 0;
 912 }
 913
 914 static int edma_dma_resume(struct dma_chan *chan)
 915 {
 916         struct edma_chan *echan = to_edma_chan(chan);
 917
 918         edma_resume(echan);
 919         return 0;
 920 }
 921
 922 /*
 923  * A PaRAM set configuration abstraction used by other modes
 924  * @chan: Channel who's PaRAM set we're configuring
 925  * @pset: PaRAM set to initialize and setup.
 926  * @src_addr: Source address of the DMA
 927  * @dst_addr: Destination address of the DMA
 928  * @burst: In units of dev_width, how much to send
 929  * @dev_width: How much is the dev_width
 930  * @dma_length: Total length of the DMA transfer
 931  * @direction: Direction of the transfer
 932  */
 933 static int edma_config_pset(struct dma_chan *chan, struct edma_pset *epset,
 934                             dma_addr_t src_addr, dma_addr_t dst_addr, u32 burst,
 935                             unsigned int acnt, unsigned int dma_length,
 936                             enum dma_transfer_direction direction)
 937 {
 938         struct edma_chan *echan = to_edma_chan(chan);
 939         struct device *dev = chan->device->dev;
 940         struct edmacc_param *param = &epset->param;
 941         int bcnt, ccnt, cidx;
 942         int src_bidx, dst_bidx, src_cidx, dst_cidx;
 943         int absync;
 944
 945         /* src/dst_maxburst == 0 is the same case as src/dst_maxburst == 1 */
 946         if (!burst)
 947                 burst = 1;
 948         /*
 949          * If the maxburst is equal to the fifo width, use
 950          * A-synced transfers. This allows for large contiguous
 951          * buffer transfers using only one PaRAM set.
 952          */
 953         if (burst == 1) {
 954                 /*
 955                  * For the A-sync case, bcnt and ccnt are the remainder
 956                  * and quotient respectively of the division of:
 957                  * (dma_length / acnt) by (SZ_64K -1). This is so
 958                  * that in case bcnt over flows, we have ccnt to use.
 959                  * Note: In A-sync tranfer only, bcntrld is used, but it
 960                  * only applies for sg_dma_len(sg) >= SZ_64K.
 961                  * In this case, the best way adopted is- bccnt for the
 962                  * first frame will be the remainder below. Then for
 963                  * every successive frame, bcnt will be SZ_64K-1. This
 964                  * is assured as bcntrld = 0xffff in end of function.
 965                  */
 966                 absync = false;
 967                 ccnt = dma_length / acnt / (SZ_64K - 1);
 968                 bcnt = dma_length / acnt - ccnt * (SZ_64K - 1);
 969                 /*
 970                  * If bcnt is non-zero, we have a remainder and hence an
 971                  * extra frame to transfer, so increment ccnt.
 972                  */
 973                 if (bcnt)
 974                         ccnt++;
 975                 else
 976                         bcnt = SZ_64K - 1;
 977                 cidx = acnt;
 978         } else {
 979                 /*
 980                  * If maxburst is greater than the fifo address_width,
 981                  * use AB-synced transfers where A count is the fifo
 982                  * address_width and B count is the maxburst. In this
 983                  * case, we are limited to transfers of C count frames
 984                  * of (address_width * maxburst) where C count is limited
 985                  * to SZ_64K-1. This places an upper bound on the length
 986                  * of an SG segment that can be handled.
 987                  */
 988                 absync = true;
 989                 bcnt = burst;
 990                 ccnt = dma_length / (acnt * bcnt);
 991                 if (ccnt > (SZ_64K - 1)) {
 992                         dev_err(dev, "Exceeded max SG segment size\n");
 993                         return -EINVAL;
 994                 }
 995                 cidx = acnt * bcnt;
 996         }
 997
 998         epset->len = dma_length;
 999
1000         if (direction == DMA_MEM_TO_DEV) {
1001                 src_bidx = acnt;
1002                 src_cidx = cidx;
1003                 dst_bidx = 0;
1004                 dst_cidx = 0;
1005                 epset->addr = src_addr;
1006         } else if (direction == DMA_DEV_TO_MEM)  {
1007                 src_bidx = 0;
1008                 src_cidx = 0;
1009                 dst_bidx = acnt;
1010                 dst_cidx = cidx;
1011                 epset->addr = dst_addr;
1012         } else if (direction == DMA_MEM_TO_MEM)  {
1013                 src_bidx = acnt;
1014                 src_cidx = cidx;
1015                 dst_bidx = acnt;
1016                 dst_cidx = cidx;
1017         } else {
1018                 dev_err(dev, "%s: direction not implemented yet\n", __func__);
1019                 return -EINVAL;
1020         }
1021
1022         param->opt = EDMA_TCC(EDMA_CHAN_SLOT(echan->ch_num));
1023         /* Configure A or AB synchronized transfers */
1024         if (absync)
1025                 param->opt |= SYNCDIM;
1026
1027         param->src = src_addr;
1028         param->dst = dst_addr;
1029
1030         param->src_dst_bidx = (dst_bidx << 16) | src_bidx;
1031         param->src_dst_cidx = (dst_cidx << 16) | src_cidx;
1032
1033         param->a_b_cnt = bcnt << 16 | acnt;
1034         param->ccnt = ccnt;
1035         /*
1036          * Only time when (bcntrld) auto reload is required is for
1037          * A-sync case, and in this case, a requirement of reload value
1038          * of SZ_64K-1 only is assured. 'link' is initially set to NULL
1039          * and then later will be populated by edma_execute.
1040          */
1041         param->link_bcntrld = 0xffffffff;
1042         return absync;
1043 }
1044
1045 static struct dma_async_tx_descriptor *edma_prep_slave_sg(
1046         struct dma_chan *chan, struct scatterlist *sgl,
1047         unsigned int sg_len, enum dma_transfer_direction direction,
1048         unsigned long tx_flags, void *context)
1049 {
1050         struct edma_chan *echan = to_edma_chan(chan);
1051         struct device *dev = chan->device->dev;
1052         struct edma_desc *edesc;
1053         dma_addr_t src_addr = 0, dst_addr = 0;
1054         enum dma_slave_buswidth dev_width;
1055         u32 burst;
1056         struct scatterlist *sg;
1057         int i, nslots, ret;
1058
1059         if (unlikely(!echan || !sgl || !sg_len))
1060                 return NULL;
1061
1062         if (direction == DMA_DEV_TO_MEM) {
1063                 src_addr = echan->cfg.src_addr;
1064                 dev_width = echan->cfg.src_addr_width;
1065                 burst = echan->cfg.src_maxburst;
1066         } else if (direction == DMA_MEM_TO_DEV) {
1067                 dst_addr = echan->cfg.dst_addr;
1068                 dev_width = echan->cfg.dst_addr_width;
1069                 burst = echan->cfg.dst_maxburst;
1070         } else {
1071                 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
1072                 return NULL;
1073         }
1074
1075         if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
1076                 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
1077                 return NULL;
1078         }
1079
1080         edesc = kzalloc(sizeof(*edesc) + sg_len * sizeof(edesc->pset[0]),
1081                         GFP_ATOMIC);
1082         if (!edesc)
1083                 return NULL;
1084
1085         edesc->pset_nr = sg_len;
1086         edesc->residue = 0;
1087         edesc->direction = direction;
1088         edesc->echan = echan;
1089
1090         /* Allocate a PaRAM slot, if needed */
1091         nslots = min_t(unsigned, MAX_NR_SG, sg_len);
1092
1093         for (i = 0; i < nslots; i++) {
1094                 if (echan->slot[i] < 0) {
1095                         echan->slot[i] =
1096                                 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
1097                         if (echan->slot[i] < 0) {
1098                                 kfree(edesc);
1099                                 dev_err(dev, "%s: Failed to allocate slot\n",
1100                                         __func__);
1101                                 return NULL;
1102                         }
1103                 }
1104         }
1105
1106         /* Configure PaRAM sets for each SG */
1107         for_each_sg(sgl, sg, sg_len, i) {
1108                 /* Get address for each SG */
1109                 if (direction == DMA_DEV_TO_MEM)
1110                         dst_addr = sg_dma_address(sg);
1111                 else
1112                         src_addr = sg_dma_address(sg);
1113
1114                 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1115                                        dst_addr, burst, dev_width,
1116                                        sg_dma_len(sg), direction);
1117                 if (ret < 0) {
1118                         kfree(edesc);
1119                         return NULL;
1120                 }
1121
1122                 edesc->absync = ret;
1123                 edesc->residue += sg_dma_len(sg);
1124
1125                 if (i == sg_len - 1)
1126                         /* Enable completion interrupt */
1127                         edesc->pset[i].param.opt |= TCINTEN;
1128                 else if (!((i+1) % MAX_NR_SG))
1129                         /*
1130                          * Enable early completion interrupt for the
1131                          * intermediateset. In this case the driver will be
1132                          * notified when the paRAM set is submitted to TC. This
1133                          * will allow more time to set up the next set of slots.
1134                          */
1135                         edesc->pset[i].param.opt |= (TCINTEN | TCCMODE);
1136         }
1137         edesc->residue_stat = edesc->residue;
1138
1139         return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1140 }
1141
1142 static struct dma_async_tx_descriptor *edma_prep_dma_memcpy(
1143         struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
1144         size_t len, unsigned long tx_flags)
1145 {
1146         int ret, nslots;
1147         struct edma_desc *edesc;
1148         struct device *dev = chan->device->dev;
1149         struct edma_chan *echan = to_edma_chan(chan);
1150         unsigned int width, pset_len, array_size;
1151
1152         if (unlikely(!echan || !len))
1153                 return NULL;
1154
1155         /* Align the array size (acnt block) with the transfer properties */
1156         switch (__ffs((src | dest | len))) {
1157         case 0:
1158                 array_size = SZ_32K - 1;
1159                 break;
1160         case 1:
1161                 array_size = SZ_32K - 2;
1162                 break;
1163         default:
1164                 array_size = SZ_32K - 4;
1165                 break;
1166         }
1167
1168         if (len < SZ_64K) {
1169                 /*
1170                  * Transfer size less than 64K can be handled with one paRAM
1171                  * slot and with one burst.
1172                  * ACNT = length
1173                  */
1174                 width = len;
1175                 pset_len = len;
1176                 nslots = 1;
1177         } else {
1178                 /*
1179                  * Transfer size bigger than 64K will be handled with maximum of
1180                  * two paRAM slots.
1181                  * slot1: (full_length / 32767) times 32767 bytes bursts.
1182                  *        ACNT = 32767, length1: (full_length / 32767) * 32767
1183                  * slot2: the remaining amount of data after slot1.
1184                  *        ACNT = full_length - length1, length2 = ACNT
1185                  *
1186                  * When the full_length is multibple of 32767 one slot can be
1187                  * used to complete the transfer.
1188                  */
1189                 width = array_size;
1190                 pset_len = rounddown(len, width);
1191                 /* One slot is enough for lengths multiple of (SZ_32K -1) */
1192                 if (unlikely(pset_len == len))
1193                         nslots = 1;
1194                 else
1195                         nslots = 2;
1196         }
1197
1198         edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1199                         GFP_ATOMIC);
1200         if (!edesc)
1201                 return NULL;
1202
1203         edesc->pset_nr = nslots;
1204         edesc->residue = edesc->residue_stat = len;
1205         edesc->direction = DMA_MEM_TO_MEM;
1206         edesc->echan = echan;
1207
1208         ret = edma_config_pset(chan, &edesc->pset[0], src, dest, 1,
1209                                width, pset_len, DMA_MEM_TO_MEM);
1210         if (ret < 0) {
1211                 kfree(edesc);
1212                 return NULL;
1213         }
1214
1215         edesc->absync = ret;
1216
1217         edesc->pset[0].param.opt |= ITCCHEN;
1218         if (nslots == 1) {
1219                 /* Enable transfer complete interrupt */
1220                 edesc->pset[0].param.opt |= TCINTEN;
1221         } else {
1222                 /* Enable transfer complete chaining for the first slot */
1223                 edesc->pset[0].param.opt |= TCCHEN;
1224
1225                 if (echan->slot[1] < 0) {
1226                         echan->slot[1] = edma_alloc_slot(echan->ecc,
1227                                                          EDMA_SLOT_ANY);
1228                         if (echan->slot[1] < 0) {
1229                                 kfree(edesc);
1230                                 dev_err(dev, "%s: Failed to allocate slot\n",
1231                                         __func__);
1232                                 return NULL;
1233                         }
1234                 }
1235                 dest += pset_len;
1236                 src += pset_len;
1237                 pset_len = width = len % array_size;
1238
1239                 ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,
1240                                        width, pset_len, DMA_MEM_TO_MEM);
1241                 if (ret < 0) {
1242                         kfree(edesc);
1243                         return NULL;
1244                 }
1245
1246                 edesc->pset[1].param.opt |= ITCCHEN;
1247                 edesc->pset[1].param.opt |= TCINTEN;
1248         }
1249
1250         return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1251 }
1252
1253 static struct dma_async_tx_descriptor *edma_prep_dma_cyclic(
1254         struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
1255         size_t period_len, enum dma_transfer_direction direction,
1256         unsigned long tx_flags)
1257 {
1258         struct edma_chan *echan = to_edma_chan(chan);
1259         struct device *dev = chan->device->dev;
1260         struct edma_desc *edesc;
1261         dma_addr_t src_addr, dst_addr;
1262         enum dma_slave_buswidth dev_width;
1263         bool use_intermediate = false;
1264         u32 burst;
1265         int i, ret, nslots;
1266
1267         if (unlikely(!echan || !buf_len || !period_len))
1268                 return NULL;
1269
1270         if (direction == DMA_DEV_TO_MEM) {
1271                 src_addr = echan->cfg.src_addr;
1272                 dst_addr = buf_addr;
1273                 dev_width = echan->cfg.src_addr_width;
1274                 burst = echan->cfg.src_maxburst;
1275         } else if (direction == DMA_MEM_TO_DEV) {
1276                 src_addr = buf_addr;
1277                 dst_addr = echan->cfg.dst_addr;
1278                 dev_width = echan->cfg.dst_addr_width;
1279                 burst = echan->cfg.dst_maxburst;
1280         } else {
1281                 dev_err(dev, "%s: bad direction: %d\n", __func__, direction);
1282                 return NULL;
1283         }
1284
1285         if (dev_width == DMA_SLAVE_BUSWIDTH_UNDEFINED) {
1286                 dev_err(dev, "%s: Undefined slave buswidth\n", __func__);
1287                 return NULL;
1288         }
1289
1290         if (unlikely(buf_len % period_len)) {
1291                 dev_err(dev, "Period should be multiple of Buffer length\n");
1292                 return NULL;
1293         }
1294
1295         nslots = (buf_len / period_len) + 1;
1296
1297         /*
1298          * Cyclic DMA users such as audio cannot tolerate delays introduced
1299          * by cases where the number of periods is more than the maximum
1300          * number of SGs the EDMA driver can handle at a time. For DMA types
1301          * such as Slave SGs, such delays are tolerable and synchronized,
1302          * but the synchronization is difficult to achieve with Cyclic and
1303          * cannot be guaranteed, so we error out early.
1304          */
1305         if (nslots > MAX_NR_SG) {
1306                 /*
1307                  * If the burst and period sizes are the same, we can put
1308                  * the full buffer into a single period and activate
1309                  * intermediate interrupts. This will produce interrupts
1310                  * after each burst, which is also after each desired period.
1311                  */
1312                 if (burst == period_len) {
1313                         period_len = buf_len;
1314                         nslots = 2;
1315                         use_intermediate = true;
1316                 } else {
1317                         return NULL;
1318                 }
1319         }
1320
1321         edesc = kzalloc(sizeof(*edesc) + nslots * sizeof(edesc->pset[0]),
1322                         GFP_ATOMIC);
1323         if (!edesc)
1324                 return NULL;
1325
1326         edesc->cyclic = 1;
1327         edesc->pset_nr = nslots;
1328         edesc->residue = edesc->residue_stat = buf_len;
1329         edesc->direction = direction;
1330         edesc->echan = echan;
1331
1332         dev_dbg(dev, "%s: channel=%d nslots=%d period_len=%zu buf_len=%zu\n",
1333                 __func__, echan->ch_num, nslots, period_len, buf_len);
1334
1335         for (i = 0; i < nslots; i++) {
1336                 /* Allocate a PaRAM slot, if needed */
1337                 if (echan->slot[i] < 0) {
1338                         echan->slot[i] =
1339                                 edma_alloc_slot(echan->ecc, EDMA_SLOT_ANY);
1340                         if (echan->slot[i] < 0) {
1341                                 kfree(edesc);
1342                                 dev_err(dev, "%s: Failed to allocate slot\n",
1343                                         __func__);
1344                                 return NULL;
1345                         }
1346                 }
1347
1348                 if (i == nslots - 1) {
1349                         memcpy(&edesc->pset[i], &edesc->pset[0],
1350                                sizeof(edesc->pset[0]));
1351                         break;
1352                 }
1353
1354                 ret = edma_config_pset(chan, &edesc->pset[i], src_addr,
1355                                        dst_addr, burst, dev_width, period_len,
1356                                        direction);
1357                 if (ret < 0) {
1358                         kfree(edesc);
1359                         return NULL;
1360                 }
1361
1362                 if (direction == DMA_DEV_TO_MEM)
1363                         dst_addr += period_len;
1364                 else
1365                         src_addr += period_len;
1366
1367                 dev_vdbg(dev, "%s: Configure period %d of buf:\n", __func__, i);
1368                 dev_vdbg(dev,
1369                         "\n pset[%d]:\n"
1370                         "  chnum\t%d\n"
1371                         "  slot\t%d\n"
1372                         "  opt\t%08x\n"
1373                         "  src\t%08x\n"
1374                         "  dst\t%08x\n"
1375                         "  abcnt\t%08x\n"
1376                         "  ccnt\t%08x\n"
1377                         "  bidx\t%08x\n"
1378                         "  cidx\t%08x\n"
1379                         "  lkrld\t%08x\n",
1380                         i, echan->ch_num, echan->slot[i],
1381                         edesc->pset[i].param.opt,
1382                         edesc->pset[i].param.src,
1383                         edesc->pset[i].param.dst,
1384                         edesc->pset[i].param.a_b_cnt,
1385                         edesc->pset[i].param.ccnt,
1386                         edesc->pset[i].param.src_dst_bidx,
1387                         edesc->pset[i].param.src_dst_cidx,
1388                         edesc->pset[i].param.link_bcntrld);
1389
1390                 edesc->absync = ret;
1391
1392                 /*
1393                  * Enable period interrupt only if it is requested
1394                  */
1395                 if (tx_flags & DMA_PREP_INTERRUPT) {
1396                         edesc->pset[i].param.opt |= TCINTEN;
1397
1398                         /* Also enable intermediate interrupts if necessary */
1399                         if (use_intermediate)
1400                                 edesc->pset[i].param.opt |= ITCINTEN;
1401                 }
1402         }
1403
1404         /* Place the cyclic channel to highest priority queue */
1405         if (!echan->tc)
1406                 edma_assign_channel_eventq(echan, EVENTQ_0);
1407
1408         return vchan_tx_prep(&echan->vchan, &edesc->vdesc, tx_flags);
1409 }
1410
1411 static void edma_completion_handler(struct edma_chan *echan)
1412 {
1413         struct device *dev = echan->vchan.chan.device->dev;
1414         struct edma_desc *edesc;
1415
1416         spin_lock(&echan->vchan.lock);
1417         edesc = echan->edesc;
1418         if (edesc) {
1419                 if (edesc->cyclic) {
1420                         vchan_cyclic_callback(&edesc->vdesc);
1421                         spin_unlock(&echan->vchan.lock);
1422                         return;
1423                 } else if (edesc->processed == edesc->pset_nr) {
1424                         edesc->residue = 0;
1425                         edma_stop(echan);
1426                         vchan_cookie_complete(&edesc->vdesc);
1427                         echan->edesc = NULL;
1428
1429                         dev_dbg(dev, "Transfer completed on channel %d\n",
1430                                 echan->ch_num);
1431                 } else {
1432                         dev_dbg(dev, "Sub transfer completed on channel %d\n",
1433                                 echan->ch_num);
1434
1435                         edma_pause(echan);
1436
1437                         /* Update statistics for tx_status */
1438                         edesc->residue -= edesc->sg_len;
1439                         edesc->residue_stat = edesc->residue;
1440                         edesc->processed_stat = edesc->processed;
1441                 }
1442                 edma_execute(echan);
1443         }
1444
1445         spin_unlock(&echan->vchan.lock);
1446 }
1447
1448 /* eDMA interrupt handler */
1449 static irqreturn_t dma_irq_handler(int irq, void *data)
1450 {
1451         struct edma_cc *ecc = data;
1452         int ctlr;
1453         u32 sh_ier;
1454         u32 sh_ipr;
1455         u32 bank;
1456
1457         ctlr = ecc->id;
1458         if (ctlr < 0)
1459                 return IRQ_NONE;
1460
1461         dev_vdbg(ecc->dev, "dma_irq_handler\n");
1462
1463         sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 0);
1464         if (!sh_ipr) {
1465                 sh_ipr = edma_shadow0_read_array(ecc, SH_IPR, 1);
1466                 if (!sh_ipr)
1467                         return IRQ_NONE;
1468                 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 1);
1469                 bank = 1;
1470         } else {
1471                 sh_ier = edma_shadow0_read_array(ecc, SH_IER, 0);
1472                 bank = 0;
1473         }
1474
1475         do {
1476                 u32 slot;
1477                 u32 channel;
1478
1479                 slot = __ffs(sh_ipr);
1480                 sh_ipr &= ~(BIT(slot));
1481
1482                 if (sh_ier & BIT(slot)) {
1483                         channel = (bank << 5) | slot;
1484                         /* Clear the corresponding IPR bits */
1485                         edma_shadow0_write_array(ecc, SH_ICR, bank, BIT(slot));
1486                         edma_completion_handler(&ecc->slave_chans[channel]);
1487                 }
1488         } while (sh_ipr);
1489
1490         edma_shadow0_write(ecc, SH_IEVAL, 1);
1491         return IRQ_HANDLED;
1492 }
1493
1494 static void edma_error_handler(struct edma_chan *echan)
1495 {
1496         struct edma_cc *ecc = echan->ecc;
1497         struct device *dev = echan->vchan.chan.device->dev;
1498         struct edmacc_param p;
1499         int err;
1500
1501         if (!echan->edesc)
1502                 return;
1503
1504         spin_lock(&echan->vchan.lock);
1505
1506         err = edma_read_slot(ecc, echan->slot[0], &p);
1507
1508         /*
1509          * Issue later based on missed flag which will be sure
1510          * to happen as:
1511          * (1) we finished transmitting an intermediate slot and
1512          *     edma_execute is coming up.
1513          * (2) or we finished current transfer and issue will
1514          *     call edma_execute.
1515          *
1516          * Important note: issuing can be dangerous here and
1517          * lead to some nasty recursion when we are in a NULL
1518          * slot. So we avoid doing so and set the missed flag.
1519          */
1520         if (err || (p.a_b_cnt == 0 && p.ccnt == 0)) {
1521                 dev_dbg(dev, "Error on null slot, setting miss\n");
1522                 echan->missed = 1;
1523         } else {
1524                 /*
1525                  * The slot is already programmed but the event got
1526                  * missed, so its safe to issue it here.
1527                  */
1528                 dev_dbg(dev, "Missed event, TRIGGERING\n");
1529                 edma_clean_channel(echan);
1530                 edma_stop(echan);
1531                 edma_start(echan);
1532                 edma_trigger_channel(echan);
1533         }
1534         spin_unlock(&echan->vchan.lock);
1535 }
1536
1537 static inline bool edma_error_pending(struct edma_cc *ecc)
1538 {
1539         if (edma_read_array(ecc, EDMA_EMR, 0) ||
1540             edma_read_array(ecc, EDMA_EMR, 1) ||
1541             edma_read(ecc, EDMA_QEMR) || edma_read(ecc, EDMA_CCERR))
1542                 return true;
1543
1544         return false;
1545 }
1546
1547 /* eDMA error interrupt handler */
1548 static irqreturn_t dma_ccerr_handler(int irq, void *data)
1549 {
1550         struct edma_cc *ecc = data;
1551         int i, j;
1552         int ctlr;
1553         unsigned int cnt = 0;
1554         unsigned int val;
1555
1556         ctlr = ecc->id;
1557         if (ctlr < 0)
1558                 return IRQ_NONE;
1559
1560         dev_vdbg(ecc->dev, "dma_ccerr_handler\n");
1561
1562         if (!edma_error_pending(ecc)) {
1563                 /*
1564                  * The registers indicate no pending error event but the irq
1565                  * handler has been called.
1566                  * Ask eDMA to re-evaluate the error registers.
1567                  */
1568                 dev_err(ecc->dev, "%s: Error interrupt without error event!\n",
1569                         __func__);
1570                 edma_write(ecc, EDMA_EEVAL, 1);
1571                 return IRQ_NONE;
1572         }
1573
1574         while (1) {
1575                 /* Event missed register(s) */
1576                 for (j = 0; j < 2; j++) {
1577                         unsigned long emr;
1578
1579                         val = edma_read_array(ecc, EDMA_EMR, j);
1580                         if (!val)
1581                                 continue;
1582
1583                         dev_dbg(ecc->dev, "EMR%d 0x%08x\n", j, val);
1584                         emr = val;
1585                         for (i = find_next_bit(&emr, 32, 0); i < 32;
1586                              i = find_next_bit(&emr, 32, i + 1)) {
1587                                 int k = (j << 5) + i;
1588
1589                                 /* Clear the corresponding EMR bits */
1590                                 edma_write_array(ecc, EDMA_EMCR, j, BIT(i));
1591                                 /* Clear any SER */
1592                                 edma_shadow0_write_array(ecc, SH_SECR, j,
1593                                                          BIT(i));
1594                                 edma_error_handler(&ecc->slave_chans[k]);
1595                         }
1596                 }
1597
1598                 val = edma_read(ecc, EDMA_QEMR);
1599                 if (val) {
1600                         dev_dbg(ecc->dev, "QEMR 0x%02x\n", val);
1601                         /* Not reported, just clear the interrupt reason. */
1602                         edma_write(ecc, EDMA_QEMCR, val);
1603                         edma_shadow0_write(ecc, SH_QSECR, val);
1604                 }
1605
1606                 val = edma_read(ecc, EDMA_CCERR);
1607                 if (val) {
1608                         dev_warn(ecc->dev, "CCERR 0x%08x\n", val);
1609                         /* Not reported, just clear the interrupt reason. */
1610                         edma_write(ecc, EDMA_CCERRCLR, val);
1611                 }
1612
1613                 if (!edma_error_pending(ecc))
1614                         break;
1615                 cnt++;
1616                 if (cnt > 10)
1617                         break;
1618         }
1619         edma_write(ecc, EDMA_EEVAL, 1);
1620         return IRQ_HANDLED;
1621 }
1622
1623 /* Alloc channel resources */
1624 static int edma_alloc_chan_resources(struct dma_chan *chan)
1625 {
1626         struct edma_chan *echan = to_edma_chan(chan);
1627         struct edma_cc *ecc = echan->ecc;
1628         struct device *dev = ecc->dev;
1629         enum dma_event_q eventq_no = EVENTQ_DEFAULT;
1630         int ret;
1631
1632         if (echan->tc) {
1633                 eventq_no = echan->tc->id;
1634         } else if (ecc->tc_list) {
1635                 /* memcpy channel */
1636                 echan->tc = &ecc->tc_list[ecc->info->default_queue];
1637                 eventq_no = echan->tc->id;
1638         }
1639
1640         ret = edma_alloc_channel(echan, eventq_no);
1641         if (ret)
1642                 return ret;
1643
1644         echan->slot[0] = edma_alloc_slot(ecc, echan->ch_num);
1645         if (echan->slot[0] < 0) {
1646                 dev_err(dev, "Entry slot allocation failed for channel %u\n",
1647                         EDMA_CHAN_SLOT(echan->ch_num));
1648                 ret = echan->slot[0];
1649                 goto err_slot;
1650         }
1651
1652         /* Set up channel -> slot mapping for the entry slot */
1653         edma_set_chmap(echan, echan->slot[0]);
1654         echan->alloced = true;
1655
1656         dev_dbg(dev, "Got eDMA channel %d for virt channel %d (%s trigger)\n",
1657                 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id,
1658                 echan->hw_triggered ? "HW" : "SW");
1659
1660         return 0;
1661
1662 err_slot:
1663         edma_free_channel(echan);
1664         return ret;
1665 }
1666
1667 /* Free channel resources */
1668 static void edma_free_chan_resources(struct dma_chan *chan)
1669 {
1670         struct edma_chan *echan = to_edma_chan(chan);
1671         struct device *dev = echan->ecc->dev;
1672         int i;
1673
1674         /* Terminate transfers */
1675         edma_stop(echan);
1676
1677         vchan_free_chan_resources(&echan->vchan);
1678
1679         /* Free EDMA PaRAM slots */
1680         for (i = 0; i < EDMA_MAX_SLOTS; i++) {
1681                 if (echan->slot[i] >= 0) {
1682                         edma_free_slot(echan->ecc, echan->slot[i]);
1683                         echan->slot[i] = -1;
1684                 }
1685         }
1686
1687         /* Set entry slot to the dummy slot */
1688         edma_set_chmap(echan, echan->ecc->dummy_slot);
1689
1690         /* Free EDMA channel */
1691         if (echan->alloced) {
1692                 edma_free_channel(echan);
1693                 echan->alloced = false;
1694         }
1695
1696         echan->tc = NULL;
1697         echan->hw_triggered = false;
1698
1699         dev_dbg(dev, "Free eDMA channel %d for virt channel %d\n",
1700                 EDMA_CHAN_SLOT(echan->ch_num), chan->chan_id);
1701 }
1702
1703 /* Send pending descriptor to hardware */
1704 static void edma_issue_pending(struct dma_chan *chan)
1705 {
1706         struct edma_chan *echan = to_edma_chan(chan);
1707         unsigned long flags;
1708
1709         spin_lock_irqsave(&echan->vchan.lock, flags);
1710         if (vchan_issue_pending(&echan->vchan) && !echan->edesc)
1711                 edma_execute(echan);
1712         spin_unlock_irqrestore(&echan->vchan.lock, flags);
1713 }
1714
1715 /*
1716  * This limit exists to avoid a possible infinite loop when waiting for proof
1717  * that a particular transfer is completed. This limit can be hit if there
1718  * are large bursts to/from slow devices or the CPU is never able to catch
1719  * the DMA hardware idle. On an AM335x transfering 48 bytes from the UART
1720  * RX-FIFO, as many as 55 loops have been seen.
1721  */
1722 #define EDMA_MAX_TR_WAIT_LOOPS 1000
1723
1724 static u32 edma_residue(struct edma_desc *edesc)
1725 {
1726         bool dst = edesc->direction == DMA_DEV_TO_MEM;
1727         int loop_count = EDMA_MAX_TR_WAIT_LOOPS;
1728         struct edma_chan *echan = edesc->echan;
1729         struct edma_pset *pset = edesc->pset;
1730         dma_addr_t done, pos;
1731         int i;
1732
1733         /*
1734          * We always read the dst/src position from the first RamPar
1735          * pset. That's the one which is active now.
1736          */
1737         pos = edma_get_position(echan->ecc, echan->slot[0], dst);
1738
1739         /*
1740          * "pos" may represent a transfer request that is still being
1741          * processed by the EDMACC or EDMATC. We will busy wait until
1742          * any one of the situations occurs:
1743          *   1. the DMA hardware is idle
1744          *   2. a new transfer request is setup
1745          *   3. we hit the loop limit
1746          */
1747         while (edma_read(echan->ecc, EDMA_CCSTAT) & EDMA_CCSTAT_ACTV) {
1748                 /* check if a new transfer request is setup */
1749                 if (edma_get_position(echan->ecc,
1750                                       echan->slot[0], dst) != pos) {
1751                         break;
1752                 }
1753
1754                 if (!--loop_count) {
1755                         dev_dbg_ratelimited(echan->vchan.chan.device->dev,
1756                                 "%s: timeout waiting for PaRAM update\n",
1757                                 __func__);
1758                         break;
1759                 }
1760
1761                 cpu_relax();
1762         }
1763
1764         /*
1765          * Cyclic is simple. Just subtract pset[0].addr from pos.
1766          *
1767          * We never update edesc->residue in the cyclic case, so we
1768          * can tell the remaining room to the end of the circular
1769          * buffer.
1770          */
1771         if (edesc->cyclic) {
1772                 done = pos - pset->addr;
1773                 edesc->residue_stat = edesc->residue - done;
1774                 return edesc->residue_stat;
1775         }
1776
1777         /*
1778          * For SG operation we catch up with the last processed
1779          * status.
1780          */
1781         pset += edesc->processed_stat;
1782
1783         for (i = edesc->processed_stat; i < edesc->processed; i++, pset++) {
1784                 /*
1785                  * If we are inside this pset address range, we know
1786                  * this is the active one. Get the current delta and
1787                  * stop walking the psets.
1788                  */
1789                 if (pos >= pset->addr && pos < pset->addr + pset->len)
1790                         return edesc->residue_stat - (pos - pset->addr);
1791
1792                 /* Otherwise mark it done and update residue_stat. */
1793                 edesc->processed_stat++;
1794                 edesc->residue_stat -= pset->len;
1795         }
1796         return edesc->residue_stat;
1797 }
1798
1799 /* Check request completion status */
1800 static enum dma_status edma_tx_status(struct dma_chan *chan,
1801                                       dma_cookie_t cookie,
1802                                       struct dma_tx_state *txstate)
1803 {
1804         struct edma_chan *echan = to_edma_chan(chan);
1805         struct virt_dma_desc *vdesc;
1806         enum dma_status ret;
1807         unsigned long flags;
1808
1809         ret = dma_cookie_status(chan, cookie, txstate);
1810         if (ret == DMA_COMPLETE || !txstate)
1811                 return ret;
1812
1813         spin_lock_irqsave(&echan->vchan.lock, flags);
1814         if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie)
1815                 txstate->residue = edma_residue(echan->edesc);
1816         else if ((vdesc = vchan_find_desc(&echan->vchan, cookie)))
1817                 txstate->residue = to_edma_desc(&vdesc->tx)->residue;
1818         spin_unlock_irqrestore(&echan->vchan.lock, flags);
1819
1820         return ret;
1821 }
1822
1823 static bool edma_is_memcpy_channel(int ch_num, s32 *memcpy_channels)
1824 {
1825         if (!memcpy_channels)
1826                 return false;
1827         while (*memcpy_channels != -1) {
1828                 if (*memcpy_channels == ch_num)
1829                         return true;
1830                 memcpy_channels++;
1831         }
1832         return false;
1833 }
1834
1835 #define EDMA_DMA_BUSWIDTHS      (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
1836                                  BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
1837                                  BIT(DMA_SLAVE_BUSWIDTH_3_BYTES) | \
1838                                  BIT(DMA_SLAVE_BUSWIDTH_4_BYTES))
1839
1840 static void edma_dma_init(struct edma_cc *ecc, bool legacy_mode)
1841 {
1842         struct dma_device *s_ddev = &ecc->dma_slave;
1843         struct dma_device *m_ddev = NULL;
1844         s32 *memcpy_channels = ecc->info->memcpy_channels;
1845         int i, j;
1846
1847         dma_cap_zero(s_ddev->cap_mask);
1848         dma_cap_set(DMA_SLAVE, s_ddev->cap_mask);
1849         dma_cap_set(DMA_CYCLIC, s_ddev->cap_mask);
1850         if (ecc->legacy_mode && !memcpy_channels) {
1851                 dev_warn(ecc->dev,
1852                          "Legacy memcpy is enabled, things might not work\n");
1853
1854                 dma_cap_set(DMA_MEMCPY, s_ddev->cap_mask);
1855                 s_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1856                 s_ddev->directions = BIT(DMA_MEM_TO_MEM);
1857         }
1858
1859         s_ddev->device_prep_slave_sg = edma_prep_slave_sg;
1860         s_ddev->device_prep_dma_cyclic = edma_prep_dma_cyclic;
1861         s_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1862         s_ddev->device_free_chan_resources = edma_free_chan_resources;
1863         s_ddev->device_issue_pending = edma_issue_pending;
1864         s_ddev->device_tx_status = edma_tx_status;
1865         s_ddev->device_config = edma_slave_config;
1866         s_ddev->device_pause = edma_dma_pause;
1867         s_ddev->device_resume = edma_dma_resume;
1868         s_ddev->device_terminate_all = edma_terminate_all;
1869         s_ddev->device_synchronize = edma_synchronize;
1870
1871         s_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1872         s_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1873         s_ddev->directions |= (BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV));
1874         s_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1875         s_ddev->max_burst = SZ_32K - 1; /* CIDX: 16bit signed */
1876
1877         s_ddev->dev = ecc->dev;
1878         INIT_LIST_HEAD(&s_ddev->channels);
1879
1880         if (memcpy_channels) {
1881                 m_ddev = devm_kzalloc(ecc->dev, sizeof(*m_ddev), GFP_KERNEL);
1882                 ecc->dma_memcpy = m_ddev;
1883
1884                 dma_cap_zero(m_ddev->cap_mask);
1885                 dma_cap_set(DMA_MEMCPY, m_ddev->cap_mask);
1886
1887                 m_ddev->device_prep_dma_memcpy = edma_prep_dma_memcpy;
1888                 m_ddev->device_alloc_chan_resources = edma_alloc_chan_resources;
1889                 m_ddev->device_free_chan_resources = edma_free_chan_resources;
1890                 m_ddev->device_issue_pending = edma_issue_pending;
1891                 m_ddev->device_tx_status = edma_tx_status;
1892                 m_ddev->device_config = edma_slave_config;
1893                 m_ddev->device_pause = edma_dma_pause;
1894                 m_ddev->device_resume = edma_dma_resume;
1895                 m_ddev->device_terminate_all = edma_terminate_all;
1896                 m_ddev->device_synchronize = edma_synchronize;
1897
1898                 m_ddev->src_addr_widths = EDMA_DMA_BUSWIDTHS;
1899                 m_ddev->dst_addr_widths = EDMA_DMA_BUSWIDTHS;
1900                 m_ddev->directions = BIT(DMA_MEM_TO_MEM);
1901                 m_ddev->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
1902
1903                 m_ddev->dev = ecc->dev;
1904                 INIT_LIST_HEAD(&m_ddev->channels);
1905         } else if (!ecc->legacy_mode) {
1906                 dev_info(ecc->dev, "memcpy is disabled\n");
1907         }
1908
1909         for (i = 0; i < ecc->num_channels; i++) {
1910                 struct edma_chan *echan = &ecc->slave_chans[i];
1911                 echan->ch_num = EDMA_CTLR_CHAN(ecc->id, i);
1912                 echan->ecc = ecc;
1913                 echan->vchan.desc_free = edma_desc_free;
1914
1915                 if (m_ddev && edma_is_memcpy_channel(i, memcpy_channels))
1916                         vchan_init(&echan->vchan, m_ddev);
1917                 else
1918                         vchan_init(&echan->vchan, s_ddev);
1919
1920                 INIT_LIST_HEAD(&echan->node);
1921                 for (j = 0; j < EDMA_MAX_SLOTS; j++)
1922                         echan->slot[j] = -1;
1923         }
1924 }
1925
1926 static int edma_setup_from_hw(struct device *dev, struct edma_soc_info *pdata,
1927                               struct edma_cc *ecc)
1928 {
1929         int i;
1930         u32 value, cccfg;
1931         s8 (*queue_priority_map)[2];
1932
1933         /* Decode the eDMA3 configuration from CCCFG register */
1934         cccfg = edma_read(ecc, EDMA_CCCFG);
1935
1936         value = GET_NUM_REGN(cccfg);
1937         ecc->num_region = BIT(value);
1938
1939         value = GET_NUM_DMACH(cccfg);
1940         ecc->num_channels = BIT(value + 1);
1941
1942         value = GET_NUM_QDMACH(cccfg);
1943         ecc->num_qchannels = value * 2;
1944
1945         value = GET_NUM_PAENTRY(cccfg);
1946         ecc->num_slots = BIT(value + 4);
1947
1948         value = GET_NUM_EVQUE(cccfg);
1949         ecc->num_tc = value + 1;
1950
1951         ecc->chmap_exist = (cccfg & CHMAP_EXIST) ? true : false;
1952
1953         dev_dbg(dev, "eDMA3 CC HW configuration (cccfg: 0x%08x):\n", cccfg);
1954         dev_dbg(dev, "num_region: %u\n", ecc->num_region);
1955         dev_dbg(dev, "num_channels: %u\n", ecc->num_channels);
1956         dev_dbg(dev, "num_qchannels: %u\n", ecc->num_qchannels);
1957         dev_dbg(dev, "num_slots: %u\n", ecc->num_slots);
1958         dev_dbg(dev, "num_tc: %u\n", ecc->num_tc);
1959         dev_dbg(dev, "chmap_exist: %s\n", ecc->chmap_exist ? "yes" : "no");
1960
1961         /* Nothing need to be done if queue priority is provided */
1962         if (pdata->queue_priority_mapping)
1963                 return 0;
1964
1965         /*
1966          * Configure TC/queue priority as follows:
1967          * Q0 - priority 0
1968          * Q1 - priority 1
1969          * Q2 - priority 2
1970          * ...
1971          * The meaning of priority numbers: 0 highest priority, 7 lowest
1972          * priority. So Q0 is the highest priority queue and the last queue has
1973          * the lowest priority.
1974          */
1975         queue_priority_map = devm_kcalloc(dev, ecc->num_tc + 1, sizeof(s8),
1976                                           GFP_KERNEL);
1977         if (!queue_priority_map)
1978                 return -ENOMEM;
1979
1980         for (i = 0; i < ecc->num_tc; i++) {
1981                 queue_priority_map[i][0] = i;
1982                 queue_priority_map[i][1] = i;
1983         }
1984         queue_priority_map[i][0] = -1;
1985         queue_priority_map[i][1] = -1;
1986
1987         pdata->queue_priority_mapping = queue_priority_map;
1988         /* Default queue has the lowest priority */
1989         pdata->default_queue = i - 1;
1990
1991         return 0;
1992 }
1993
1994 #if IS_ENABLED(CONFIG_OF)
1995 static int edma_xbar_event_map(struct device *dev, struct edma_soc_info *pdata,
1996                                size_t sz)
1997 {
1998         const char pname[] = "ti,edma-xbar-event-map";
1999         struct resource res;
2000         void __iomem *xbar;
2001         s16 (*xbar_chans)[2];
2002         size_t nelm = sz / sizeof(s16);
2003         u32 shift, offset, mux;
2004         int ret, i;
2005
2006         xbar_chans = devm_kcalloc(dev, nelm + 2, sizeof(s16), GFP_KERNEL);
2007         if (!xbar_chans)
2008                 return -ENOMEM;
2009
2010         ret = of_address_to_resource(dev->of_node, 1, &res);
2011         if (ret)
2012                 return -ENOMEM;
2013
2014         xbar = devm_ioremap(dev, res.start, resource_size(&res));
2015         if (!xbar)
2016                 return -ENOMEM;
2017
2018         ret = of_property_read_u16_array(dev->of_node, pname, (u16 *)xbar_chans,
2019                                          nelm);
2020         if (ret)
2021                 return -EIO;
2022
2023         /* Invalidate last entry for the other user of this mess */
2024         nelm >>= 1;
2025         xbar_chans[nelm][0] = -1;
2026         xbar_chans[nelm][1] = -1;
2027
2028         for (i = 0; i < nelm; i++) {
2029                 shift = (xbar_chans[i][1] & 0x03) << 3;
2030                 offset = xbar_chans[i][1] & 0xfffffffc;
2031                 mux = readl(xbar + offset);
2032                 mux &= ~(0xff << shift);
2033                 mux |= xbar_chans[i][0] << shift;
2034                 writel(mux, (xbar + offset));
2035         }
2036
2037         pdata->xbar_chans = (const s16 (*)[2]) xbar_chans;
2038         return 0;
2039 }
2040
2041 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2042                                                      bool legacy_mode)
2043 {
2044         struct edma_soc_info *info;
2045         struct property *prop;
2046         int sz, ret;
2047
2048         info = devm_kzalloc(dev, sizeof(struct edma_soc_info), GFP_KERNEL);
2049         if (!info)
2050                 return ERR_PTR(-ENOMEM);
2051
2052         if (legacy_mode) {
2053                 prop = of_find_property(dev->of_node, "ti,edma-xbar-event-map",
2054                                         &sz);
2055                 if (prop) {
2056                         ret = edma_xbar_event_map(dev, info, sz);
2057                         if (ret)
2058                                 return ERR_PTR(ret);
2059                 }
2060                 return info;
2061         }
2062
2063         /* Get the list of channels allocated to be used for memcpy */
2064         prop = of_find_property(dev->of_node, "ti,edma-memcpy-channels", &sz);
2065         if (prop) {
2066                 const char pname[] = "ti,edma-memcpy-channels";
2067                 size_t nelm = sz / sizeof(s32);
2068                 s32 *memcpy_ch;
2069
2070                 memcpy_ch = devm_kcalloc(dev, nelm + 1, sizeof(s32),
2071                                          GFP_KERNEL);
2072                 if (!memcpy_ch)
2073                         return ERR_PTR(-ENOMEM);
2074
2075                 ret = of_property_read_u32_array(dev->of_node, pname,
2076                                                  (u32 *)memcpy_ch, nelm);
2077                 if (ret)
2078                         return ERR_PTR(ret);
2079
2080                 memcpy_ch[nelm] = -1;
2081                 info->memcpy_channels = memcpy_ch;
2082         }
2083
2084         prop = of_find_property(dev->of_node, "ti,edma-reserved-slot-ranges",
2085                                 &sz);
2086         if (prop) {
2087                 const char pname[] = "ti,edma-reserved-slot-ranges";
2088                 u32 (*tmp)[2];
2089                 s16 (*rsv_slots)[2];
2090                 size_t nelm = sz / sizeof(*tmp);
2091                 struct edma_rsv_info *rsv_info;
2092                 int i;
2093
2094                 if (!nelm)
2095                         return info;
2096
2097                 tmp = kcalloc(nelm, sizeof(*tmp), GFP_KERNEL);
2098                 if (!tmp)
2099                         return ERR_PTR(-ENOMEM);
2100
2101                 rsv_info = devm_kzalloc(dev, sizeof(*rsv_info), GFP_KERNEL);
2102                 if (!rsv_info) {
2103                         kfree(tmp);
2104                         return ERR_PTR(-ENOMEM);
2105                 }
2106
2107                 rsv_slots = devm_kcalloc(dev, nelm + 1, sizeof(*rsv_slots),
2108                                          GFP_KERNEL);
2109                 if (!rsv_slots) {
2110                         kfree(tmp);
2111                         return ERR_PTR(-ENOMEM);
2112                 }
2113
2114                 ret = of_property_read_u32_array(dev->of_node, pname,
2115                                                  (u32 *)tmp, nelm * 2);
2116                 if (ret) {
2117                         kfree(tmp);
2118                         return ERR_PTR(ret);
2119                 }
2120
2121                 for (i = 0; i < nelm; i++) {
2122                         rsv_slots[i][0] = tmp[i][0];
2123                         rsv_slots[i][1] = tmp[i][1];
2124                 }
2125                 rsv_slots[nelm][0] = -1;
2126                 rsv_slots[nelm][1] = -1;
2127
2128                 info->rsv = rsv_info;
2129                 info->rsv->rsv_slots = (const s16 (*)[2])rsv_slots;
2130
2131                 kfree(tmp);
2132         }
2133
2134         return info;
2135 }
2136
2137 static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2138                                       struct of_dma *ofdma)
2139 {
2140         struct edma_cc *ecc = ofdma->of_dma_data;
2141         struct dma_chan *chan = NULL;
2142         struct edma_chan *echan;
2143         int i;
2144
2145         if (!ecc || dma_spec->args_count < 1)
2146                 return NULL;
2147
2148         for (i = 0; i < ecc->num_channels; i++) {
2149                 echan = &ecc->slave_chans[i];
2150                 if (echan->ch_num == dma_spec->args[0]) {
2151                         chan = &echan->vchan.chan;
2152                         break;
2153                 }
2154         }
2155
2156         if (!chan)
2157                 return NULL;
2158
2159         if (echan->ecc->legacy_mode && dma_spec->args_count == 1)
2160                 goto out;
2161
2162         if (!echan->ecc->legacy_mode && dma_spec->args_count == 2 &&
2163             dma_spec->args[1] < echan->ecc->num_tc) {
2164                 echan->tc = &echan->ecc->tc_list[dma_spec->args[1]];
2165                 goto out;
2166         }
2167
2168         return NULL;
2169 out:
2170         /* The channel is going to be used as HW synchronized */
2171         echan->hw_triggered = true;
2172         return dma_get_slave_channel(chan);
2173 }
2174 #else
2175 static struct edma_soc_info *edma_setup_info_from_dt(struct device *dev,
2176                                                      bool legacy_mode)
2177 {
2178         return ERR_PTR(-EINVAL);
2179 }
2180
2181 static struct dma_chan *of_edma_xlate(struct of_phandle_args *dma_spec,
2182                                       struct of_dma *ofdma)
2183 {
2184         return NULL;
2185 }
2186 #endif
2187
2188 static int edma_probe(struct platform_device *pdev)
2189 {
2190         struct edma_soc_info    *info = pdev->dev.platform_data;
2191         s8                      (*queue_priority_mapping)[2];
2192         int                     i, off, ln;
2193         const s16               (*rsv_slots)[2];
2194         const s16               (*xbar_chans)[2];
2195         int                     irq;
2196         char                    *irq_name;
2197         struct resource         *mem;
2198         struct device_node      *node = pdev->dev.of_node;
2199         struct device           *dev = &pdev->dev;
2200         struct edma_cc          *ecc;
2201         bool                    legacy_mode = true;
2202         int ret;
2203
2204         if (node) {
2205                 const struct of_device_id *match;
2206
2207                 match = of_match_node(edma_of_ids, node);
2208                 if (match && (*(u32 *)match->data) == EDMA_BINDING_TPCC)
2209                         legacy_mode = false;
2210
2211                 info = edma_setup_info_from_dt(dev, legacy_mode);
2212                 if (IS_ERR(info)) {
2213                         dev_err(dev, "failed to get DT data\n");
2214                         return PTR_ERR(info);
2215                 }
2216         }
2217
2218         if (!info)
2219                 return -ENODEV;
2220
2221         pm_runtime_enable(dev);
2222         ret = pm_runtime_get_sync(dev);
2223         if (ret < 0) {
2224                 dev_err(dev, "pm_runtime_get_sync() failed\n");
2225                 return ret;
2226         }
2227
2228         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
2229         if (ret)
2230                 return ret;
2231
2232         ecc = devm_kzalloc(dev, sizeof(*ecc), GFP_KERNEL);
2233         if (!ecc)
2234                 return -ENOMEM;
2235
2236         ecc->dev = dev;
2237         ecc->id = pdev->id;
2238         ecc->legacy_mode = legacy_mode;
2239         /* When booting with DT the pdev->id is -1 */
2240         if (ecc->id < 0)
2241                 ecc->id = 0;
2242
2243         mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "edma3_cc");
2244         if (!mem) {
2245                 dev_dbg(dev, "mem resource not found, using index 0\n");
2246                 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2247                 if (!mem) {
2248                         dev_err(dev, "no mem resource?\n");
2249                         return -ENODEV;
2250                 }
2251         }
2252         ecc->base = devm_ioremap_resource(dev, mem);
2253         if (IS_ERR(ecc->base))
2254                 return PTR_ERR(ecc->base);
2255
2256         platform_set_drvdata(pdev, ecc);
2257
2258         /* Get eDMA3 configuration from IP */
2259         ret = edma_setup_from_hw(dev, info, ecc);
2260         if (ret)
2261                 return ret;
2262
2263         /* Allocate memory based on the information we got from the IP */
2264         ecc->slave_chans = devm_kcalloc(dev, ecc->num_channels,
2265                                         sizeof(*ecc->slave_chans), GFP_KERNEL);
2266         if (!ecc->slave_chans)
2267                 return -ENOMEM;
2268
2269         ecc->slot_inuse = devm_kcalloc(dev, BITS_TO_LONGS(ecc->num_slots),
2270                                        sizeof(unsigned long), GFP_KERNEL);
2271         if (!ecc->slot_inuse)
2272                 return -ENOMEM;
2273
2274         ecc->default_queue = info->default_queue;
2275
2276         for (i = 0; i < ecc->num_slots; i++)
2277                 edma_write_slot(ecc, i, &dummy_paramset);
2278
2279         if (info->rsv) {
2280                 /* Set the reserved slots in inuse list */
2281                 rsv_slots = info->rsv->rsv_slots;
2282                 if (rsv_slots) {
2283                         for (i = 0; rsv_slots[i][0] != -1; i++) {
2284                                 off = rsv_slots[i][0];
2285                                 ln = rsv_slots[i][1];
2286                                 edma_set_bits(off, ln, ecc->slot_inuse);
2287                         }
2288                 }
2289         }
2290
2291         /* Clear the xbar mapped channels in unused list */
2292         xbar_chans = info->xbar_chans;
2293         if (xbar_chans) {
2294                 for (i = 0; xbar_chans[i][1] != -1; i++) {
2295                         off = xbar_chans[i][1];
2296                 }
2297         }
2298
2299         irq = platform_get_irq_byname(pdev, "edma3_ccint");
2300         if (irq < 0 && node)
2301                 irq = irq_of_parse_and_map(node, 0);
2302
2303         if (irq >= 0) {
2304                 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccint",
2305                                           dev_name(dev));
2306                 ret = devm_request_irq(dev, irq, dma_irq_handler, 0, irq_name,
2307                                        ecc);
2308                 if (ret) {
2309                         dev_err(dev, "CCINT (%d) failed --> %d\n", irq, ret);
2310                         return ret;
2311                 }
2312                 ecc->ccint = irq;
2313         }
2314
2315         irq = platform_get_irq_byname(pdev, "edma3_ccerrint");
2316         if (irq < 0 && node)
2317                 irq = irq_of_parse_and_map(node, 2);
2318
2319         if (irq >= 0) {
2320                 irq_name = devm_kasprintf(dev, GFP_KERNEL, "%s_ccerrint",
2321                                           dev_name(dev));
2322                 ret = devm_request_irq(dev, irq, dma_ccerr_handler, 0, irq_name,
2323                                        ecc);
2324                 if (ret) {
2325                         dev_err(dev, "CCERRINT (%d) failed --> %d\n", irq, ret);
2326                         return ret;
2327                 }
2328                 ecc->ccerrint = irq;
2329         }
2330
2331         ecc->dummy_slot = edma_alloc_slot(ecc, EDMA_SLOT_ANY);
2332         if (ecc->dummy_slot < 0) {
2333                 dev_err(dev, "Can't allocate PaRAM dummy slot\n");
2334                 return ecc->dummy_slot;
2335         }
2336
2337         queue_priority_mapping = info->queue_priority_mapping;
2338
2339         if (!ecc->legacy_mode) {
2340                 int lowest_priority = 0;
2341                 struct of_phandle_args tc_args;
2342
2343                 ecc->tc_list = devm_kcalloc(dev, ecc->num_tc,
2344                                             sizeof(*ecc->tc_list), GFP_KERNEL);
2345                 if (!ecc->tc_list)
2346                         return -ENOMEM;
2347
2348                 for (i = 0;; i++) {
2349                         ret = of_parse_phandle_with_fixed_args(node, "ti,tptcs",
2350                                                                1, i, &tc_args);
2351                         if (ret || i == ecc->num_tc)
2352                                 break;
2353
2354                         ecc->tc_list[i].node = tc_args.np;
2355                         ecc->tc_list[i].id = i;
2356                         queue_priority_mapping[i][1] = tc_args.args[0];
2357                         if (queue_priority_mapping[i][1] > lowest_priority) {
2358                                 lowest_priority = queue_priority_mapping[i][1];
2359                                 info->default_queue = i;
2360                         }
2361                 }
2362         }
2363
2364         /* Event queue priority mapping */
2365         for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2366                 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2367                                               queue_priority_mapping[i][1]);
2368
2369         for (i = 0; i < ecc->num_region; i++) {
2370                 edma_write_array2(ecc, EDMA_DRAE, i, 0, 0x0);
2371                 edma_write_array2(ecc, EDMA_DRAE, i, 1, 0x0);
2372                 edma_write_array(ecc, EDMA_QRAE, i, 0x0);
2373         }
2374         ecc->info = info;
2375
2376         /* Init the dma device and channels */
2377         edma_dma_init(ecc, legacy_mode);
2378
2379         for (i = 0; i < ecc->num_channels; i++) {
2380                 /* Assign all channels to the default queue */
2381                 edma_assign_channel_eventq(&ecc->slave_chans[i],
2382                                            info->default_queue);
2383                 /* Set entry slot to the dummy slot */
2384                 edma_set_chmap(&ecc->slave_chans[i], ecc->dummy_slot);
2385         }
2386
2387         ecc->dma_slave.filter.map = info->slave_map;
2388         ecc->dma_slave.filter.mapcnt = info->slavecnt;
2389         ecc->dma_slave.filter.fn = edma_filter_fn;
2390
2391         ret = dma_async_device_register(&ecc->dma_slave);
2392         if (ret) {
2393                 dev_err(dev, "slave ddev registration failed (%d)\n", ret);
2394                 goto err_reg1;
2395         }
2396
2397         if (ecc->dma_memcpy) {
2398                 ret = dma_async_device_register(ecc->dma_memcpy);
2399                 if (ret) {
2400                         dev_err(dev, "memcpy ddev registration failed (%d)\n",
2401                                 ret);
2402                         dma_async_device_unregister(&ecc->dma_slave);
2403                         goto err_reg1;
2404                 }
2405         }
2406
2407         if (node)
2408                 of_dma_controller_register(node, of_edma_xlate, ecc);
2409
2410         dev_info(dev, "TI EDMA DMA engine driver\n");
2411
2412         return 0;
2413
2414 err_reg1:
2415         edma_free_slot(ecc, ecc->dummy_slot);
2416         return ret;
2417 }
2418
2419 static void edma_cleanupp_vchan(struct dma_device *dmadev)
2420 {
2421         struct edma_chan *echan, *_echan;
2422
2423         list_for_each_entry_safe(echan, _echan,
2424                         &dmadev->channels, vchan.chan.device_node) {
2425                 list_del(&echan->vchan.chan.device_node);
2426                 tasklet_kill(&echan->vchan.task);
2427         }
2428 }
2429
2430 static int edma_remove(struct platform_device *pdev)
2431 {
2432         struct device *dev = &pdev->dev;
2433         struct edma_cc *ecc = dev_get_drvdata(dev);
2434
2435         devm_free_irq(dev, ecc->ccint, ecc);
2436         devm_free_irq(dev, ecc->ccerrint, ecc);
2437
2438         edma_cleanupp_vchan(&ecc->dma_slave);
2439
2440         if (dev->of_node)
2441                 of_dma_controller_free(dev->of_node);
2442         dma_async_device_unregister(&ecc->dma_slave);
2443         if (ecc->dma_memcpy)
2444                 dma_async_device_unregister(ecc->dma_memcpy);
2445         edma_free_slot(ecc, ecc->dummy_slot);
2446
2447         return 0;
2448 }
2449
2450 #ifdef CONFIG_PM_SLEEP
2451 static int edma_pm_suspend(struct device *dev)
2452 {
2453         struct edma_cc *ecc = dev_get_drvdata(dev);
2454         struct edma_chan *echan = ecc->slave_chans;
2455         int i;
2456
2457         for (i = 0; i < ecc->num_channels; i++) {
2458                 if (echan[i].alloced)
2459                         edma_setup_interrupt(&echan[i], false);
2460         }
2461
2462         return 0;
2463 }
2464
2465 static int edma_pm_resume(struct device *dev)
2466 {
2467         struct edma_cc *ecc = dev_get_drvdata(dev);
2468         struct edma_chan *echan = ecc->slave_chans;
2469         int i;
2470         s8 (*queue_priority_mapping)[2];
2471
2472         /* re initialize dummy slot to dummy param set */
2473         edma_write_slot(ecc, ecc->dummy_slot, &dummy_paramset);
2474
2475         queue_priority_mapping = ecc->info->queue_priority_mapping;
2476
2477         /* Event queue priority mapping */
2478         for (i = 0; queue_priority_mapping[i][0] != -1; i++)
2479                 edma_assign_priority_to_queue(ecc, queue_priority_mapping[i][0],
2480                                               queue_priority_mapping[i][1]);
2481
2482         for (i = 0; i < ecc->num_channels; i++) {
2483                 if (echan[i].alloced) {
2484                         /* ensure access through shadow region 0 */
2485                         edma_or_array2(ecc, EDMA_DRAE, 0, i >> 5,
2486                                        BIT(i & 0x1f));
2487
2488                         edma_setup_interrupt(&echan[i], true);
2489
2490                         /* Set up channel -> slot mapping for the entry slot */
2491                         edma_set_chmap(&echan[i], echan[i].slot[0]);
2492                 }
2493         }
2494
2495         return 0;
2496 }
2497 #endif
2498
2499 static const struct dev_pm_ops edma_pm_ops = {
2500         SET_LATE_SYSTEM_SLEEP_PM_OPS(edma_pm_suspend, edma_pm_resume)
2501 };
2502
2503 static struct platform_driver edma_driver = {
2504         .probe          = edma_probe,
2505         .remove         = edma_remove,
2506         .driver = {
2507                 .name   = "edma",
2508                 .pm     = &edma_pm_ops,
2509                 .of_match_table = edma_of_ids,
2510         },
2511 };
2512
2513 static int edma_tptc_probe(struct platform_device *pdev)
2514 {
2515         pm_runtime_enable(&pdev->dev);
2516         return pm_runtime_get_sync(&pdev->dev);
2517 }
2518
2519 static struct platform_driver edma_tptc_driver = {
2520         .probe          = edma_tptc_probe,
2521         .driver = {
2522                 .name   = "edma3-tptc",
2523                 .of_match_table = edma_tptc_of_ids,
2524         },
2525 };
2526
2527 bool edma_filter_fn(struct dma_chan *chan, void *param)
2528 {
2529         bool match = false;
2530
2531         if (chan->device->dev->driver == &edma_driver.driver) {
2532                 struct edma_chan *echan = to_edma_chan(chan);
2533                 unsigned ch_req = *(unsigned *)param;
2534                 if (ch_req == echan->ch_num) {
2535                         /* The channel is going to be used as HW synchronized */
2536                         echan->hw_triggered = true;
2537                         match = true;
2538                 }
2539         }
2540         return match;
2541 }
2542 EXPORT_SYMBOL(edma_filter_fn);
2543
2544 static int edma_init(void)
2545 {
2546         int ret;
2547
2548         ret = platform_driver_register(&edma_tptc_driver);
2549         if (ret)
2550                 return ret;
2551
2552         return platform_driver_register(&edma_driver);
2553 }
2554 subsys_initcall(edma_init);
2555
2556 static void __exit edma_exit(void)
2557 {
2558         platform_driver_unregister(&edma_driver);
2559         platform_driver_unregister(&edma_tptc_driver);
2560 }
2561 module_exit(edma_exit);
2562
2563 MODULE_AUTHOR("Matt Porter <matt.porter@linaro.org>");
2564 MODULE_DESCRIPTION("TI EDMA DMA engine driver");
2565 MODULE_LICENSE("GPL v2");