drivers/usb/renesas_usbhs/fifo.c

   1 // SPDX-License-Identifier: GPL-1.0+
   2 /*
   3  * Renesas USB driver
   4  *
   5  * Copyright (C) 2011 Renesas Solutions Corp.
   6  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   7  */
   8 #include <linux/delay.h>
   9 #include <linux/io.h>
  10 #include <linux/scatterlist.h>
  11 #include "common.h"
  12 #include "pipe.h"
  13
  14 #define usbhsf_get_cfifo(p)     (&((p)->fifo_info.cfifo))
  15 #define usbhsf_is_cfifo(p, f)   (usbhsf_get_cfifo(p) == f)
  16
  17 #define usbhsf_fifo_is_busy(f)  ((f)->pipe) /* see usbhs_pipe_select_fifo */
  18
  19 /*
  20  *              packet initialize
  21  */
  22 void usbhs_pkt_init(struct usbhs_pkt *pkt)
  23 {
  24         INIT_LIST_HEAD(&pkt->node);
  25 }
  26
  27 /*
  28  *              packet control function
  29  */
  30 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
  31 {
  32         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
  33         struct device *dev = usbhs_priv_to_dev(priv);
  34
  35         dev_err(dev, "null handler\n");
  36
  37         return -EINVAL;
  38 }
  39
  40 static const struct usbhs_pkt_handle usbhsf_null_handler = {
  41         .prepare = usbhsf_null_handle,
  42         .try_run = usbhsf_null_handle,
  43 };
  44
  45 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
  46                     void (*done)(struct usbhs_priv *priv,
  47                                  struct usbhs_pkt *pkt),
  48                     void *buf, int len, int zero, int sequence)
  49 {
  50         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
  51         struct device *dev = usbhs_priv_to_dev(priv);
  52         unsigned long flags;
  53
  54         if (!done) {
  55                 dev_err(dev, "no done function\n");
  56                 return;
  57         }
  58
  59         /********************  spin lock ********************/
  60         usbhs_lock(priv, flags);
  61
  62         if (!pipe->handler) {
  63                 dev_err(dev, "no handler function\n");
  64                 pipe->handler = &usbhsf_null_handler;
  65         }
  66
  67         list_move_tail(&pkt->node, &pipe->list);
  68
  69         /*
  70          * each pkt must hold own handler.
  71          * because handler might be changed by its situation.
  72          * dma handler -> pio handler.
  73          */
  74         pkt->pipe       = pipe;
  75         pkt->buf        = buf;
  76         pkt->handler    = pipe->handler;
  77         pkt->length     = len;
  78         pkt->zero       = zero;
  79         pkt->actual     = 0;
  80         pkt->done       = done;
  81         pkt->sequence   = sequence;
  82
  83         usbhs_unlock(priv, flags);
  84         /********************  spin unlock ******************/
  85 }
  86
  87 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
  88 {
  89         list_del_init(&pkt->node);
  90 }
  91
  92 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
  93 {
  94         return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
  95 }
  96
  97 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
  98                                  struct usbhs_fifo *fifo);
  99 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 100                                             struct usbhs_pkt *pkt);
 101 #define usbhsf_dma_map(p)       __usbhsf_dma_map_ctrl(p, 1)
 102 #define usbhsf_dma_unmap(p)     __usbhsf_dma_map_ctrl(p, 0)
 103 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
 104 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
 105 {
 106         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 107         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 108         unsigned long flags;
 109
 110         /********************  spin lock ********************/
 111         usbhs_lock(priv, flags);
 112
 113         usbhs_pipe_disable(pipe);
 114
 115         if (!pkt)
 116                 pkt = __usbhsf_pkt_get(pipe);
 117
 118         if (pkt) {
 119                 struct dma_chan *chan = NULL;
 120
 121                 if (fifo)
 122                         chan = usbhsf_dma_chan_get(fifo, pkt);
 123                 if (chan) {
 124                         dmaengine_terminate_all(chan);
 125                         usbhsf_dma_unmap(pkt);
 126                 }
 127
 128                 usbhs_pipe_clear_without_sequence(pipe, 0, 0);
 129
 130                 __usbhsf_pkt_del(pkt);
 131         }
 132
 133         if (fifo)
 134                 usbhsf_fifo_unselect(pipe, fifo);
 135
 136         usbhs_unlock(priv, flags);
 137         /********************  spin unlock ******************/
 138
 139         return pkt;
 140 }
 141
 142 enum {
 143         USBHSF_PKT_PREPARE,
 144         USBHSF_PKT_TRY_RUN,
 145         USBHSF_PKT_DMA_DONE,
 146 };
 147
 148 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
 149 {
 150         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 151         struct usbhs_pkt *pkt;
 152         struct device *dev = usbhs_priv_to_dev(priv);
 153         int (*func)(struct usbhs_pkt *pkt, int *is_done);
 154         unsigned long flags;
 155         int ret = 0;
 156         int is_done = 0;
 157
 158         /********************  spin lock ********************/
 159         usbhs_lock(priv, flags);
 160
 161         pkt = __usbhsf_pkt_get(pipe);
 162         if (!pkt)
 163                 goto __usbhs_pkt_handler_end;
 164
 165         switch (type) {
 166         case USBHSF_PKT_PREPARE:
 167                 func = pkt->handler->prepare;
 168                 break;
 169         case USBHSF_PKT_TRY_RUN:
 170                 func = pkt->handler->try_run;
 171                 break;
 172         case USBHSF_PKT_DMA_DONE:
 173                 func = pkt->handler->dma_done;
 174                 break;
 175         default:
 176                 dev_err(dev, "unknown pkt handler\n");
 177                 goto __usbhs_pkt_handler_end;
 178         }
 179
 180         if (likely(func))
 181                 ret = func(pkt, &is_done);
 182
 183         if (is_done)
 184                 __usbhsf_pkt_del(pkt);
 185
 186 __usbhs_pkt_handler_end:
 187         usbhs_unlock(priv, flags);
 188         /********************  spin unlock ******************/
 189
 190         if (is_done) {
 191                 pkt->done(priv, pkt);
 192                 usbhs_pkt_start(pipe);
 193         }
 194
 195         return ret;
 196 }
 197
 198 void usbhs_pkt_start(struct usbhs_pipe *pipe)
 199 {
 200         usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
 201 }
 202
 203 /*
 204  *              irq enable/disable function
 205  */
 206 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
 207 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
 208 #define usbhsf_irq_callback_ctrl(pipe, status, enable)                  \
 209         ({                                                              \
 210                 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);     \
 211                 struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
 212                 u16 status = (1 << usbhs_pipe_number(pipe));            \
 213                 if (!mod)                                               \
 214                         return;                                         \
 215                 if (enable)                                             \
 216                         mod->status |= status;                          \
 217                 else                                                    \
 218                         mod->status &= ~status;                         \
 219                 usbhs_irq_callback_update(priv, mod);                   \
 220         })
 221
 222 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 223 {
 224         /*
 225          * And DCP pipe can NOT use "ready interrupt" for "send"
 226          * it should use "empty" interrupt.
 227          * see
 228          *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
 229          *
 230          * on the other hand, normal pipe can use "ready interrupt" for "send"
 231          * even though it is single/double buffer
 232          */
 233         if (usbhs_pipe_is_dcp(pipe))
 234                 usbhsf_irq_empty_ctrl(pipe, enable);
 235         else
 236                 usbhsf_irq_ready_ctrl(pipe, enable);
 237 }
 238
 239 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 240 {
 241         usbhsf_irq_ready_ctrl(pipe, enable);
 242 }
 243
 244 /*
 245  *              FIFO ctrl
 246  */
 247 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
 248                                    struct usbhs_fifo *fifo)
 249 {
 250         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 251
 252         usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
 253 }
 254
 255 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
 256                                struct usbhs_fifo *fifo)
 257 {
 258         /* The FIFO port is accessible */
 259         if (usbhs_read(priv, fifo->ctr) & FRDY)
 260                 return 0;
 261
 262         return -EBUSY;
 263 }
 264
 265 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
 266                               struct usbhs_fifo *fifo)
 267 {
 268         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 269         int ret = 0;
 270
 271         if (!usbhs_pipe_is_dcp(pipe)) {
 272                 /*
 273                  * This driver checks the pipe condition first to avoid -EBUSY
 274                  * from usbhsf_fifo_barrier() if the pipe is RX direction and
 275                  * empty.
 276                  */
 277                 if (usbhs_pipe_is_dir_in(pipe))
 278                         ret = usbhs_pipe_is_accessible(pipe);
 279                 if (!ret)
 280                         ret = usbhsf_fifo_barrier(priv, fifo);
 281         }
 282
 283         /*
 284          * if non-DCP pipe, this driver should set BCLR when
 285          * usbhsf_fifo_barrier() returns 0.
 286          */
 287         if (!ret)
 288                 usbhs_write(priv, fifo->ctr, BCLR);
 289 }
 290
 291 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
 292                                struct usbhs_fifo *fifo)
 293 {
 294         return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
 295 }
 296
 297 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
 298                                  struct usbhs_fifo *fifo)
 299 {
 300         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 301
 302         usbhs_pipe_select_fifo(pipe, NULL);
 303         usbhs_write(priv, fifo->sel, 0);
 304 }
 305
 306 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
 307                               struct usbhs_fifo *fifo,
 308                               int write)
 309 {
 310         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 311         struct device *dev = usbhs_priv_to_dev(priv);
 312         int timeout = 1024;
 313         u16 mask = ((1 << 5) | 0xF);            /* mask of ISEL | CURPIPE */
 314         u16 base = usbhs_pipe_number(pipe);     /* CURPIPE */
 315
 316         if (usbhs_pipe_is_busy(pipe) ||
 317             usbhsf_fifo_is_busy(fifo))
 318                 return -EBUSY;
 319
 320         if (usbhs_pipe_is_dcp(pipe)) {
 321                 base |= (1 == write) << 5;      /* ISEL */
 322
 323                 if (usbhs_mod_is_host(priv))
 324                         usbhs_dcp_dir_for_host(pipe, write);
 325         }
 326
 327         /* "base" will be used below  */
 328         if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
 329                 usbhs_write(priv, fifo->sel, base);
 330         else
 331                 usbhs_write(priv, fifo->sel, base | MBW_32);
 332
 333         /* check ISEL and CURPIPE value */
 334         while (timeout--) {
 335                 if (base == (mask & usbhs_read(priv, fifo->sel))) {
 336                         usbhs_pipe_select_fifo(pipe, fifo);
 337                         return 0;
 338                 }
 339                 udelay(10);
 340         }
 341
 342         dev_err(dev, "fifo select error\n");
 343
 344         return -EIO;
 345 }
 346
 347 /*
 348  *              DCP status stage
 349  */
 350 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
 351 {
 352         struct usbhs_pipe *pipe = pkt->pipe;
 353         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 354         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 355         struct device *dev = usbhs_priv_to_dev(priv);
 356         int ret;
 357
 358         usbhs_pipe_disable(pipe);
 359
 360         ret = usbhsf_fifo_select(pipe, fifo, 1);
 361         if (ret < 0) {
 362                 dev_err(dev, "%s() faile\n", __func__);
 363                 return ret;
 364         }
 365
 366         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 367
 368         usbhsf_fifo_clear(pipe, fifo);
 369         usbhsf_send_terminator(pipe, fifo);
 370
 371         usbhsf_fifo_unselect(pipe, fifo);
 372
 373         usbhsf_tx_irq_ctrl(pipe, 1);
 374         usbhs_pipe_enable(pipe);
 375
 376         return ret;
 377 }
 378
 379 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
 380 {
 381         struct usbhs_pipe *pipe = pkt->pipe;
 382         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 383         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 384         struct device *dev = usbhs_priv_to_dev(priv);
 385         int ret;
 386
 387         usbhs_pipe_disable(pipe);
 388
 389         ret = usbhsf_fifo_select(pipe, fifo, 0);
 390         if (ret < 0) {
 391                 dev_err(dev, "%s() fail\n", __func__);
 392                 return ret;
 393         }
 394
 395         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 396         usbhsf_fifo_clear(pipe, fifo);
 397
 398         usbhsf_fifo_unselect(pipe, fifo);
 399
 400         usbhsf_rx_irq_ctrl(pipe, 1);
 401         usbhs_pipe_enable(pipe);
 402
 403         return ret;
 404
 405 }
 406
 407 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
 408 {
 409         struct usbhs_pipe *pipe = pkt->pipe;
 410
 411         if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
 412                 usbhsf_tx_irq_ctrl(pipe, 0);
 413         else
 414                 usbhsf_rx_irq_ctrl(pipe, 0);
 415
 416         pkt->actual = pkt->length;
 417         *is_done = 1;
 418
 419         return 0;
 420 }
 421
 422 const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
 423         .prepare = usbhs_dcp_dir_switch_to_write,
 424         .try_run = usbhs_dcp_dir_switch_done,
 425 };
 426
 427 const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
 428         .prepare = usbhs_dcp_dir_switch_to_read,
 429         .try_run = usbhs_dcp_dir_switch_done,
 430 };
 431
 432 /*
 433  *              DCP data stage (push)
 434  */
 435 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
 436 {
 437         struct usbhs_pipe *pipe = pkt->pipe;
 438
 439         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 440
 441         /*
 442          * change handler to PIO push
 443          */
 444         pkt->handler = &usbhs_fifo_pio_push_handler;
 445
 446         return pkt->handler->prepare(pkt, is_done);
 447 }
 448
 449 const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
 450         .prepare = usbhsf_dcp_data_stage_try_push,
 451 };
 452
 453 /*
 454  *              DCP data stage (pop)
 455  */
 456 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
 457                                              int *is_done)
 458 {
 459         struct usbhs_pipe *pipe = pkt->pipe;
 460         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 461         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 462
 463         if (usbhs_pipe_is_busy(pipe))
 464                 return 0;
 465
 466         /*
 467          * prepare pop for DCP should
 468          *  - change DCP direction,
 469          *  - clear fifo
 470          *  - DATA1
 471          */
 472         usbhs_pipe_disable(pipe);
 473
 474         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 475
 476         usbhsf_fifo_select(pipe, fifo, 0);
 477         usbhsf_fifo_clear(pipe, fifo);
 478         usbhsf_fifo_unselect(pipe, fifo);
 479
 480         /*
 481          * change handler to PIO pop
 482          */
 483         pkt->handler = &usbhs_fifo_pio_pop_handler;
 484
 485         return pkt->handler->prepare(pkt, is_done);
 486 }
 487
 488 const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
 489         .prepare = usbhsf_dcp_data_stage_prepare_pop,
 490 };
 491
 492 /*
 493  *              PIO push handler
 494  */
 495 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 496 {
 497         struct usbhs_pipe *pipe = pkt->pipe;
 498         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 499         struct device *dev = usbhs_priv_to_dev(priv);
 500         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 501         void __iomem *addr = priv->base + fifo->port;
 502         u8 *buf;
 503         int maxp = usbhs_pipe_get_maxpacket(pipe);
 504         int total_len;
 505         int i, ret, len;
 506         int is_short;
 507
 508         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 509         pkt->sequence = -1; /* -1 sequence will be ignored */
 510
 511         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 512
 513         ret = usbhsf_fifo_select(pipe, fifo, 1);
 514         if (ret < 0)
 515                 return 0;
 516
 517         ret = usbhs_pipe_is_accessible(pipe);
 518         if (ret < 0) {
 519                 /* inaccessible pipe is not an error */
 520                 ret = 0;
 521                 goto usbhs_fifo_write_busy;
 522         }
 523
 524         ret = usbhsf_fifo_barrier(priv, fifo);
 525         if (ret < 0)
 526                 goto usbhs_fifo_write_busy;
 527
 528         buf             = pkt->buf    + pkt->actual;
 529         len             = pkt->length - pkt->actual;
 530         len             = min(len, maxp);
 531         total_len       = len;
 532         is_short        = total_len < maxp;
 533
 534         /*
 535          * FIXME
 536          *
 537          * 32-bit access only
 538          */
 539         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 540                 iowrite32_rep(addr, buf, len / 4);
 541                 len %= 4;
 542                 buf += total_len - len;
 543         }
 544
 545         /* the rest operation */
 546         for (i = 0; i < len; i++)
 547                 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
 548
 549         /*
 550          * variable update
 551          */
 552         pkt->actual += total_len;
 553
 554         if (pkt->actual < pkt->length)
 555                 *is_done = 0;           /* there are remainder data */
 556         else if (is_short)
 557                 *is_done = 1;           /* short packet */
 558         else
 559                 *is_done = !pkt->zero;  /* send zero packet ? */
 560
 561         /*
 562          * pipe/irq handling
 563          */
 564         if (is_short)
 565                 usbhsf_send_terminator(pipe, fifo);
 566
 567         usbhsf_tx_irq_ctrl(pipe, !*is_done);
 568         usbhs_pipe_running(pipe, !*is_done);
 569         usbhs_pipe_enable(pipe);
 570
 571         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 572                 usbhs_pipe_number(pipe),
 573                 pkt->length, pkt->actual, *is_done, pkt->zero);
 574
 575         usbhsf_fifo_unselect(pipe, fifo);
 576
 577         return 0;
 578
 579 usbhs_fifo_write_busy:
 580         usbhsf_fifo_unselect(pipe, fifo);
 581
 582         /*
 583          * pipe is busy.
 584          * retry in interrupt
 585          */
 586         usbhsf_tx_irq_ctrl(pipe, 1);
 587         usbhs_pipe_running(pipe, 1);
 588
 589         return ret;
 590 }
 591
 592 static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 593 {
 594         if (usbhs_pipe_is_running(pkt->pipe))
 595                 return 0;
 596
 597         return usbhsf_pio_try_push(pkt, is_done);
 598 }
 599
 600 const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
 601         .prepare = usbhsf_pio_prepare_push,
 602         .try_run = usbhsf_pio_try_push,
 603 };
 604
 605 /*
 606  *              PIO pop handler
 607  */
 608 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 609 {
 610         struct usbhs_pipe *pipe = pkt->pipe;
 611         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 612         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 613
 614         if (usbhs_pipe_is_busy(pipe))
 615                 return 0;
 616
 617         if (usbhs_pipe_is_running(pipe))
 618                 return 0;
 619
 620         /*
 621          * pipe enable to prepare packet receive
 622          */
 623         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 624         pkt->sequence = -1; /* -1 sequence will be ignored */
 625
 626         if (usbhs_pipe_is_dcp(pipe))
 627                 usbhsf_fifo_clear(pipe, fifo);
 628
 629         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 630         usbhs_pipe_enable(pipe);
 631         usbhs_pipe_running(pipe, 1);
 632         usbhsf_rx_irq_ctrl(pipe, 1);
 633
 634         return 0;
 635 }
 636
 637 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 638 {
 639         struct usbhs_pipe *pipe = pkt->pipe;
 640         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 641         struct device *dev = usbhs_priv_to_dev(priv);
 642         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 643         void __iomem *addr = priv->base + fifo->port;
 644         u8 *buf;
 645         u32 data = 0;
 646         int maxp = usbhs_pipe_get_maxpacket(pipe);
 647         int rcv_len, len;
 648         int i, ret;
 649         int total_len = 0;
 650
 651         ret = usbhsf_fifo_select(pipe, fifo, 0);
 652         if (ret < 0)
 653                 return 0;
 654
 655         ret = usbhsf_fifo_barrier(priv, fifo);
 656         if (ret < 0)
 657                 goto usbhs_fifo_read_busy;
 658
 659         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 660
 661         buf             = pkt->buf    + pkt->actual;
 662         len             = pkt->length - pkt->actual;
 663         len             = min(len, rcv_len);
 664         total_len       = len;
 665
 666         /*
 667          * update actual length first here to decide disable pipe.
 668          * if this pipe keeps BUF status and all data were popped,
 669          * then, next interrupt/token will be issued again
 670          */
 671         pkt->actual += total_len;
 672
 673         if ((pkt->actual == pkt->length) ||     /* receive all data */
 674             (total_len < maxp)) {               /* short packet */
 675                 *is_done = 1;
 676                 usbhsf_rx_irq_ctrl(pipe, 0);
 677                 usbhs_pipe_running(pipe, 0);
 678                 /*
 679                  * If function mode, since this controller is possible to enter
 680                  * Control Write status stage at this timing, this driver
 681                  * should not disable the pipe. If such a case happens, this
 682                  * controller is not able to complete the status stage.
 683                  */
 684                 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
 685                         usbhs_pipe_disable(pipe);       /* disable pipe first */
 686         }
 687
 688         /*
 689          * Buffer clear if Zero-Length packet
 690          *
 691          * see
 692          * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
 693          */
 694         if (0 == rcv_len) {
 695                 pkt->zero = 1;
 696                 usbhsf_fifo_clear(pipe, fifo);
 697                 goto usbhs_fifo_read_end;
 698         }
 699
 700         /*
 701          * FIXME
 702          *
 703          * 32-bit access only
 704          */
 705         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 706                 ioread32_rep(addr, buf, len / 4);
 707                 len %= 4;
 708                 buf += total_len - len;
 709         }
 710
 711         /* the rest operation */
 712         for (i = 0; i < len; i++) {
 713                 if (!(i & 0x03))
 714                         data = ioread32(addr);
 715
 716                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
 717         }
 718
 719 usbhs_fifo_read_end:
 720         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 721                 usbhs_pipe_number(pipe),
 722                 pkt->length, pkt->actual, *is_done, pkt->zero);
 723
 724 usbhs_fifo_read_busy:
 725         usbhsf_fifo_unselect(pipe, fifo);
 726
 727         return ret;
 728 }
 729
 730 const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
 731         .prepare = usbhsf_prepare_pop,
 732         .try_run = usbhsf_pio_try_pop,
 733 };
 734
 735 /*
 736  *              DCP ctrol statge handler
 737  */
 738 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 739 {
 740         usbhs_dcp_control_transfer_done(pkt->pipe);
 741
 742         *is_done = 1;
 743
 744         return 0;
 745 }
 746
 747 const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
 748         .prepare = usbhsf_ctrl_stage_end,
 749         .try_run = usbhsf_ctrl_stage_end,
 750 };
 751
 752 /*
 753  *              DMA fifo functions
 754  */
 755 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 756                                             struct usbhs_pkt *pkt)
 757 {
 758         if (&usbhs_fifo_dma_push_handler == pkt->handler)
 759                 return fifo->tx_chan;
 760
 761         if (&usbhs_fifo_dma_pop_handler == pkt->handler)
 762                 return fifo->rx_chan;
 763
 764         return NULL;
 765 }
 766
 767 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
 768                                               struct usbhs_pkt *pkt)
 769 {
 770         struct usbhs_fifo *fifo;
 771         int i;
 772
 773         usbhs_for_each_dfifo(priv, fifo, i) {
 774                 if (usbhsf_dma_chan_get(fifo, pkt) &&
 775                     !usbhsf_fifo_is_busy(fifo))
 776                         return fifo;
 777         }
 778
 779         return NULL;
 780 }
 781
 782 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 783 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 784 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
 785                               struct usbhs_fifo *fifo,
 786                               u16 dreqe)
 787 {
 788         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 789
 790         usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 791 }
 792
 793 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 794 {
 795         struct usbhs_pipe *pipe = pkt->pipe;
 796         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 797         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 798         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 799         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 800
 801         return info->dma_map_ctrl(chan->device->dev, pkt, map);
 802 }
 803
 804 static void usbhsf_dma_complete(void *arg);
 805 static void xfer_work(struct work_struct *work)
 806 {
 807         struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
 808         struct usbhs_pipe *pipe = pkt->pipe;
 809         struct usbhs_fifo *fifo;
 810         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 811         struct dma_async_tx_descriptor *desc;
 812         struct dma_chan *chan;
 813         struct device *dev = usbhs_priv_to_dev(priv);
 814         enum dma_transfer_direction dir;
 815         unsigned long flags;
 816
 817         usbhs_lock(priv, flags);
 818         fifo = usbhs_pipe_to_fifo(pipe);
 819         if (!fifo)
 820                 goto xfer_work_end;
 821
 822         chan = usbhsf_dma_chan_get(fifo, pkt);
 823         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 824
 825         desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
 826                                         pkt->trans, dir,
 827                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 828         if (!desc)
 829                 goto xfer_work_end;
 830
 831         desc->callback          = usbhsf_dma_complete;
 832         desc->callback_param    = pipe;
 833
 834         pkt->cookie = dmaengine_submit(desc);
 835         if (pkt->cookie < 0) {
 836                 dev_err(dev, "Failed to submit dma descriptor\n");
 837                 goto xfer_work_end;
 838         }
 839
 840         dev_dbg(dev, "  %s %d (%d/ %d)\n",
 841                 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 842
 843         usbhs_pipe_running(pipe, 1);
 844         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 845         dma_async_issue_pending(chan);
 846         usbhsf_dma_start(pipe, fifo);
 847         usbhs_pipe_enable(pipe);
 848
 849 xfer_work_end:
 850         usbhs_unlock(priv, flags);
 851 }
 852
 853 /*
 854  *              DMA push handler
 855  */
 856 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 857 {
 858         struct usbhs_pipe *pipe = pkt->pipe;
 859         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 860         struct usbhs_fifo *fifo;
 861         int len = pkt->length - pkt->actual;
 862         int ret;
 863         uintptr_t align_mask;
 864
 865         if (usbhs_pipe_is_busy(pipe))
 866                 return 0;
 867
 868         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 869         if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
 870             usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
 871                 goto usbhsf_pio_prepare_push;
 872
 873         /* check data length if this driver don't use USB-DMAC */
 874         if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
 875                 goto usbhsf_pio_prepare_push;
 876
 877         /* check buffer alignment */
 878         align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
 879                                         USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
 880         if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
 881                 goto usbhsf_pio_prepare_push;
 882
 883         /* return at this time if the pipe is running */
 884         if (usbhs_pipe_is_running(pipe))
 885                 return 0;
 886
 887         /* get enable DMA fifo */
 888         fifo = usbhsf_get_dma_fifo(priv, pkt);
 889         if (!fifo)
 890                 goto usbhsf_pio_prepare_push;
 891
 892         ret = usbhsf_fifo_select(pipe, fifo, 0);
 893         if (ret < 0)
 894                 goto usbhsf_pio_prepare_push;
 895
 896         if (usbhsf_dma_map(pkt) < 0)
 897                 goto usbhsf_pio_prepare_push_unselect;
 898
 899         pkt->trans = len;
 900
 901         usbhsf_tx_irq_ctrl(pipe, 0);
 902         INIT_WORK(&pkt->work, xfer_work);
 903         schedule_work(&pkt->work);
 904
 905         return 0;
 906
 907 usbhsf_pio_prepare_push_unselect:
 908         usbhsf_fifo_unselect(pipe, fifo);
 909 usbhsf_pio_prepare_push:
 910         /*
 911          * change handler to PIO
 912          */
 913         pkt->handler = &usbhs_fifo_pio_push_handler;
 914
 915         return pkt->handler->prepare(pkt, is_done);
 916 }
 917
 918 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 919 {
 920         struct usbhs_pipe *pipe = pkt->pipe;
 921         int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
 922
 923         pkt->actual += pkt->trans;
 924
 925         if (pkt->actual < pkt->length)
 926                 *is_done = 0;           /* there are remainder data */
 927         else if (is_short)
 928                 *is_done = 1;           /* short packet */
 929         else
 930                 *is_done = !pkt->zero;  /* send zero packet? */
 931
 932         usbhs_pipe_running(pipe, !*is_done);
 933
 934         usbhsf_dma_stop(pipe, pipe->fifo);
 935         usbhsf_dma_unmap(pkt);
 936         usbhsf_fifo_unselect(pipe, pipe->fifo);
 937
 938         if (!*is_done) {
 939                 /* change handler to PIO */
 940                 pkt->handler = &usbhs_fifo_pio_push_handler;
 941                 return pkt->handler->try_run(pkt, is_done);
 942         }
 943
 944         return 0;
 945 }
 946
 947 const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
 948         .prepare        = usbhsf_dma_prepare_push,
 949         .dma_done       = usbhsf_dma_push_done,
 950 };
 951
 952 /*
 953  *              DMA pop handler
 954  */
 955
 956 static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
 957                                               int *is_done)
 958 {
 959         return usbhsf_prepare_pop(pkt, is_done);
 960 }
 961
 962 static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
 963                                                 int *is_done)
 964 {
 965         struct usbhs_pipe *pipe = pkt->pipe;
 966         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 967         struct usbhs_fifo *fifo;
 968         int ret;
 969
 970         if (usbhs_pipe_is_busy(pipe))
 971                 return 0;
 972
 973         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 974         if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
 975             usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
 976                 goto usbhsf_pio_prepare_pop;
 977
 978         fifo = usbhsf_get_dma_fifo(priv, pkt);
 979         if (!fifo)
 980                 goto usbhsf_pio_prepare_pop;
 981
 982         if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
 983                 goto usbhsf_pio_prepare_pop;
 984
 985         /* return at this time if the pipe is running */
 986         if (usbhs_pipe_is_running(pipe))
 987                 return 0;
 988
 989         usbhs_pipe_config_change_bfre(pipe, 1);
 990
 991         ret = usbhsf_fifo_select(pipe, fifo, 0);
 992         if (ret < 0)
 993                 goto usbhsf_pio_prepare_pop;
 994
 995         if (usbhsf_dma_map(pkt) < 0)
 996                 goto usbhsf_pio_prepare_pop_unselect;
 997
 998         /* DMA */
 999
1000         /*
1001          * usbhs_fifo_dma_pop_handler :: prepare
1002          * enabled irq to come here.
1003          * but it is no longer needed for DMA. disable it.
1004          */
1005         usbhsf_rx_irq_ctrl(pipe, 0);
1006
1007         pkt->trans = pkt->length;
1008
1009         INIT_WORK(&pkt->work, xfer_work);
1010         schedule_work(&pkt->work);
1011
1012         return 0;
1013
1014 usbhsf_pio_prepare_pop_unselect:
1015         usbhsf_fifo_unselect(pipe, fifo);
1016 usbhsf_pio_prepare_pop:
1017
1018         /*
1019          * change handler to PIO
1020          */
1021         pkt->handler = &usbhs_fifo_pio_pop_handler;
1022         usbhs_pipe_config_change_bfre(pipe, 0);
1023
1024         return pkt->handler->prepare(pkt, is_done);
1025 }
1026
1027 static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1028 {
1029         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1030
1031         if (usbhs_get_dparam(priv, has_usb_dmac))
1032                 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1033         else
1034                 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1035 }
1036
1037 static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1038 {
1039         struct usbhs_pipe *pipe = pkt->pipe;
1040         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1041         struct usbhs_fifo *fifo;
1042         int len, ret;
1043
1044         if (usbhs_pipe_is_busy(pipe))
1045                 return 0;
1046
1047         if (usbhs_pipe_is_dcp(pipe))
1048                 goto usbhsf_pio_prepare_pop;
1049
1050         /* get enable DMA fifo */
1051         fifo = usbhsf_get_dma_fifo(priv, pkt);
1052         if (!fifo)
1053                 goto usbhsf_pio_prepare_pop;
1054
1055         if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1056                 goto usbhsf_pio_prepare_pop;
1057
1058         ret = usbhsf_fifo_select(pipe, fifo, 0);
1059         if (ret < 0)
1060                 goto usbhsf_pio_prepare_pop;
1061
1062         /* use PIO if packet is less than pio_dma_border */
1063         len = usbhsf_fifo_rcv_len(priv, fifo);
1064         len = min(pkt->length - pkt->actual, len);
1065         if (len & 0x7) /* 8byte alignment */
1066                 goto usbhsf_pio_prepare_pop_unselect;
1067
1068         if (len < usbhs_get_dparam(priv, pio_dma_border))
1069                 goto usbhsf_pio_prepare_pop_unselect;
1070
1071         ret = usbhsf_fifo_barrier(priv, fifo);
1072         if (ret < 0)
1073                 goto usbhsf_pio_prepare_pop_unselect;
1074
1075         if (usbhsf_dma_map(pkt) < 0)
1076                 goto usbhsf_pio_prepare_pop_unselect;
1077
1078         /* DMA */
1079
1080         /*
1081          * usbhs_fifo_dma_pop_handler :: prepare
1082          * enabled irq to come here.
1083          * but it is no longer needed for DMA. disable it.
1084          */
1085         usbhsf_rx_irq_ctrl(pipe, 0);
1086
1087         pkt->trans = len;
1088
1089         INIT_WORK(&pkt->work, xfer_work);
1090         schedule_work(&pkt->work);
1091
1092         return 0;
1093
1094 usbhsf_pio_prepare_pop_unselect:
1095         usbhsf_fifo_unselect(pipe, fifo);
1096 usbhsf_pio_prepare_pop:
1097
1098         /*
1099          * change handler to PIO
1100          */
1101         pkt->handler = &usbhs_fifo_pio_pop_handler;
1102
1103         return pkt->handler->try_run(pkt, is_done);
1104 }
1105
1106 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1107 {
1108         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1109
1110         BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1111
1112         return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1113 }
1114
1115 static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1116 {
1117         struct usbhs_pipe *pipe = pkt->pipe;
1118         int maxp = usbhs_pipe_get_maxpacket(pipe);
1119
1120         usbhsf_dma_stop(pipe, pipe->fifo);
1121         usbhsf_dma_unmap(pkt);
1122         usbhsf_fifo_unselect(pipe, pipe->fifo);
1123
1124         pkt->actual += pkt->trans;
1125
1126         if ((pkt->actual == pkt->length) ||     /* receive all data */
1127             (pkt->trans < maxp)) {              /* short packet */
1128                 *is_done = 1;
1129                 usbhs_pipe_running(pipe, 0);
1130         } else {
1131                 /* re-enable */
1132                 usbhs_pipe_running(pipe, 0);
1133                 usbhsf_prepare_pop(pkt, is_done);
1134         }
1135
1136         return 0;
1137 }
1138
1139 static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1140                                            struct dma_chan *chan, int dtln)
1141 {
1142         struct usbhs_pipe *pipe = pkt->pipe;
1143         struct dma_tx_state state;
1144         size_t received_size;
1145         int maxp = usbhs_pipe_get_maxpacket(pipe);
1146
1147         dmaengine_tx_status(chan, pkt->cookie, &state);
1148         received_size = pkt->length - state.residue;
1149
1150         if (dtln) {
1151                 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1152                 received_size &= ~(maxp - 1);
1153                 received_size += dtln;
1154         }
1155
1156         return received_size;
1157 }
1158
1159 static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1160                                              int *is_done)
1161 {
1162         struct usbhs_pipe *pipe = pkt->pipe;
1163         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1164         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1165         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1166         int rcv_len;
1167
1168         /*
1169          * Since the driver disables rx_irq in DMA mode, the interrupt handler
1170          * cannot the BRDYSTS. So, the function clears it here because the
1171          * driver may use PIO mode next time.
1172          */
1173         usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1174
1175         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1176         usbhsf_fifo_clear(pipe, fifo);
1177         pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1178
1179         usbhs_pipe_running(pipe, 0);
1180         usbhsf_dma_stop(pipe, fifo);
1181         usbhsf_dma_unmap(pkt);
1182         usbhsf_fifo_unselect(pipe, pipe->fifo);
1183
1184         /* The driver can assume the rx transaction is always "done" */
1185         *is_done = 1;
1186
1187         return 0;
1188 }
1189
1190 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1191 {
1192         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1193
1194         if (usbhs_get_dparam(priv, has_usb_dmac))
1195                 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1196         else
1197                 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1198 }
1199
1200 const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1201         .prepare        = usbhsf_dma_prepare_pop,
1202         .try_run        = usbhsf_dma_try_pop,
1203         .dma_done       = usbhsf_dma_pop_done
1204 };
1205
1206 /*
1207  *              DMA setting
1208  */
1209 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1210 {
1211         struct sh_dmae_slave *slave = param;
1212
1213         /*
1214          * FIXME
1215          *
1216          * usbhs doesn't recognize id = 0 as valid DMA
1217          */
1218         if (0 == slave->shdma_slave.slave_id)
1219                 return false;
1220
1221         chan->private = slave;
1222
1223         return true;
1224 }
1225
1226 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1227 {
1228         if (fifo->tx_chan)
1229                 dma_release_channel(fifo->tx_chan);
1230         if (fifo->rx_chan)
1231                 dma_release_channel(fifo->rx_chan);
1232
1233         fifo->tx_chan = NULL;
1234         fifo->rx_chan = NULL;
1235 }
1236
1237 static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1238 {
1239         dma_cap_mask_t mask;
1240
1241         dma_cap_zero(mask);
1242         dma_cap_set(DMA_SLAVE, mask);
1243         fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1244                                             &fifo->tx_slave);
1245
1246         dma_cap_zero(mask);
1247         dma_cap_set(DMA_SLAVE, mask);
1248         fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1249                                             &fifo->rx_slave);
1250 }
1251
1252 static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1253                                int channel)
1254 {
1255         char name[16];
1256
1257         /*
1258          * To avoid complex handing for DnFIFOs, the driver uses each
1259          * DnFIFO as TX or RX direction (not bi-direction).
1260          * So, the driver uses odd channels for TX, even channels for RX.
1261          */
1262         snprintf(name, sizeof(name), "ch%d", channel);
1263         if (channel & 1) {
1264                 fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
1265                 if (IS_ERR(fifo->tx_chan))
1266                         fifo->tx_chan = NULL;
1267         } else {
1268                 fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
1269                 if (IS_ERR(fifo->rx_chan))
1270                         fifo->rx_chan = NULL;
1271         }
1272 }
1273
1274 static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1275                             int channel)
1276 {
1277         struct device *dev = usbhs_priv_to_dev(priv);
1278
1279         if (dev->of_node)
1280                 usbhsf_dma_init_dt(dev, fifo, channel);
1281         else
1282                 usbhsf_dma_init_pdev(fifo);
1283
1284         if (fifo->tx_chan || fifo->rx_chan)
1285                 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1286                          fifo->name,
1287                          fifo->tx_chan ? "[TX]" : "    ",
1288                          fifo->rx_chan ? "[RX]" : "    ");
1289 }
1290
1291 /*
1292  *              irq functions
1293  */
1294 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1295                             struct usbhs_irq_state *irq_state)
1296 {
1297         struct usbhs_pipe *pipe;
1298         struct device *dev = usbhs_priv_to_dev(priv);
1299         int i, ret;
1300
1301         if (!irq_state->bempsts) {
1302                 dev_err(dev, "debug %s !!\n", __func__);
1303                 return -EIO;
1304         }
1305
1306         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1307
1308         /*
1309          * search interrupted "pipe"
1310          * not "uep".
1311          */
1312         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1313                 if (!(irq_state->bempsts & (1 << i)))
1314                         continue;
1315
1316                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1317                 if (ret < 0)
1318                         dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1319         }
1320
1321         return 0;
1322 }
1323
1324 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1325                             struct usbhs_irq_state *irq_state)
1326 {
1327         struct usbhs_pipe *pipe;
1328         struct device *dev = usbhs_priv_to_dev(priv);
1329         int i, ret;
1330
1331         if (!irq_state->brdysts) {
1332                 dev_err(dev, "debug %s !!\n", __func__);
1333                 return -EIO;
1334         }
1335
1336         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1337
1338         /*
1339          * search interrupted "pipe"
1340          * not "uep".
1341          */
1342         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1343                 if (!(irq_state->brdysts & (1 << i)))
1344                         continue;
1345
1346                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1347                 if (ret < 0)
1348                         dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1349         }
1350
1351         return 0;
1352 }
1353
1354 static void usbhsf_dma_complete(void *arg)
1355 {
1356         struct usbhs_pipe *pipe = arg;
1357         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1358         struct device *dev = usbhs_priv_to_dev(priv);
1359         int ret;
1360
1361         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1362         if (ret < 0)
1363                 dev_err(dev, "dma_complete run_error %d : %d\n",
1364                         usbhs_pipe_number(pipe), ret);
1365 }
1366
1367 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1368 {
1369         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1370         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1371
1372         /* clear DCP FIFO of transmission */
1373         if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1374                 return;
1375         usbhsf_fifo_clear(pipe, fifo);
1376         usbhsf_fifo_unselect(pipe, fifo);
1377
1378         /* clear DCP FIFO of reception */
1379         if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1380                 return;
1381         usbhsf_fifo_clear(pipe, fifo);
1382         usbhsf_fifo_unselect(pipe, fifo);
1383 }
1384
1385 /*
1386  *              fifo init
1387  */
1388 void usbhs_fifo_init(struct usbhs_priv *priv)
1389 {
1390         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1391         struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1392         struct usbhs_fifo *dfifo;
1393         int i;
1394
1395         mod->irq_empty          = usbhsf_irq_empty;
1396         mod->irq_ready          = usbhsf_irq_ready;
1397         mod->irq_bempsts        = 0;
1398         mod->irq_brdysts        = 0;
1399
1400         cfifo->pipe     = NULL;
1401         usbhs_for_each_dfifo(priv, dfifo, i)
1402                 dfifo->pipe     = NULL;
1403 }
1404
1405 void usbhs_fifo_quit(struct usbhs_priv *priv)
1406 {
1407         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1408
1409         mod->irq_empty          = NULL;
1410         mod->irq_ready          = NULL;
1411         mod->irq_bempsts        = 0;
1412         mod->irq_brdysts        = 0;
1413 }
1414
1415 #define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port)              \
1416 do {                                                                    \
1417         fifo = usbhsf_get_dnfifo(priv, channel);                        \
1418         fifo->name      = "D"#channel"FIFO";                            \
1419         fifo->port      = fifo_port;                                    \
1420         fifo->sel       = D##channel##FIFOSEL;                          \
1421         fifo->ctr       = D##channel##FIFOCTR;                          \
1422         fifo->tx_slave.shdma_slave.slave_id =                           \
1423                         usbhs_get_dparam(priv, d##channel##_tx_id);     \
1424         fifo->rx_slave.shdma_slave.slave_id =                           \
1425                         usbhs_get_dparam(priv, d##channel##_rx_id);     \
1426         usbhsf_dma_init(priv, fifo, channel);                           \
1427 } while (0)
1428
1429 #define USBHS_DFIFO_INIT(priv, fifo, channel)                           \
1430                 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1431 #define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel)                   \
1432                 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1433
1434 int usbhs_fifo_probe(struct usbhs_priv *priv)
1435 {
1436         struct usbhs_fifo *fifo;
1437
1438         /* CFIFO */
1439         fifo = usbhsf_get_cfifo(priv);
1440         fifo->name      = "CFIFO";
1441         fifo->port      = CFIFO;
1442         fifo->sel       = CFIFOSEL;
1443         fifo->ctr       = CFIFOCTR;
1444
1445         /* DFIFO */
1446         USBHS_DFIFO_INIT(priv, fifo, 0);
1447         USBHS_DFIFO_INIT(priv, fifo, 1);
1448         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1449         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1450
1451         return 0;
1452 }
1453
1454 void usbhs_fifo_remove(struct usbhs_priv *priv)
1455 {
1456         struct usbhs_fifo *fifo;
1457         int i;
1458
1459         usbhs_for_each_dfifo(priv, fifo, i)
1460                 usbhsf_dma_quit(priv, fifo);
1461 }