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  * Copyright (C) 2019 Renesas Electronics Corporation
   7  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   8  */
   9 #include <linux/delay.h>
  10 #include <linux/io.h>
  11 #include <linux/scatterlist.h>
  12 #include "common.h"
  13 #include "pipe.h"
  14
  15 #define usbhsf_get_cfifo(p)     (&((p)->fifo_info.cfifo))
  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 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         usbhs_write(priv, fifo->sel, base | MBW_32);
 329
 330         /* check ISEL and CURPIPE value */
 331         while (timeout--) {
 332                 if (base == (mask & usbhs_read(priv, fifo->sel))) {
 333                         usbhs_pipe_select_fifo(pipe, fifo);
 334                         return 0;
 335                 }
 336                 udelay(10);
 337         }
 338
 339         dev_err(dev, "fifo select error\n");
 340
 341         return -EIO;
 342 }
 343
 344 /*
 345  *              DCP status stage
 346  */
 347 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
 348 {
 349         struct usbhs_pipe *pipe = pkt->pipe;
 350         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 351         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 352         struct device *dev = usbhs_priv_to_dev(priv);
 353         int ret;
 354
 355         usbhs_pipe_disable(pipe);
 356
 357         ret = usbhsf_fifo_select(pipe, fifo, 1);
 358         if (ret < 0) {
 359                 dev_err(dev, "%s() faile\n", __func__);
 360                 return ret;
 361         }
 362
 363         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 364
 365         usbhsf_fifo_clear(pipe, fifo);
 366         usbhsf_send_terminator(pipe, fifo);
 367
 368         usbhsf_fifo_unselect(pipe, fifo);
 369
 370         usbhsf_tx_irq_ctrl(pipe, 1);
 371         usbhs_pipe_enable(pipe);
 372
 373         return ret;
 374 }
 375
 376 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
 377 {
 378         struct usbhs_pipe *pipe = pkt->pipe;
 379         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 380         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 381         struct device *dev = usbhs_priv_to_dev(priv);
 382         int ret;
 383
 384         usbhs_pipe_disable(pipe);
 385
 386         ret = usbhsf_fifo_select(pipe, fifo, 0);
 387         if (ret < 0) {
 388                 dev_err(dev, "%s() fail\n", __func__);
 389                 return ret;
 390         }
 391
 392         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 393         usbhsf_fifo_clear(pipe, fifo);
 394
 395         usbhsf_fifo_unselect(pipe, fifo);
 396
 397         usbhsf_rx_irq_ctrl(pipe, 1);
 398         usbhs_pipe_enable(pipe);
 399
 400         return ret;
 401
 402 }
 403
 404 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
 405 {
 406         struct usbhs_pipe *pipe = pkt->pipe;
 407
 408         if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
 409                 usbhsf_tx_irq_ctrl(pipe, 0);
 410         else
 411                 usbhsf_rx_irq_ctrl(pipe, 0);
 412
 413         pkt->actual = pkt->length;
 414         *is_done = 1;
 415
 416         return 0;
 417 }
 418
 419 const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
 420         .prepare = usbhs_dcp_dir_switch_to_write,
 421         .try_run = usbhs_dcp_dir_switch_done,
 422 };
 423
 424 const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
 425         .prepare = usbhs_dcp_dir_switch_to_read,
 426         .try_run = usbhs_dcp_dir_switch_done,
 427 };
 428
 429 /*
 430  *              DCP data stage (push)
 431  */
 432 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
 433 {
 434         struct usbhs_pipe *pipe = pkt->pipe;
 435
 436         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 437
 438         /*
 439          * change handler to PIO push
 440          */
 441         pkt->handler = &usbhs_fifo_pio_push_handler;
 442
 443         return pkt->handler->prepare(pkt, is_done);
 444 }
 445
 446 const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
 447         .prepare = usbhsf_dcp_data_stage_try_push,
 448 };
 449
 450 /*
 451  *              DCP data stage (pop)
 452  */
 453 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
 454                                              int *is_done)
 455 {
 456         struct usbhs_pipe *pipe = pkt->pipe;
 457         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 458         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 459
 460         if (usbhs_pipe_is_busy(pipe))
 461                 return 0;
 462
 463         /*
 464          * prepare pop for DCP should
 465          *  - change DCP direction,
 466          *  - clear fifo
 467          *  - DATA1
 468          */
 469         usbhs_pipe_disable(pipe);
 470
 471         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 472
 473         usbhsf_fifo_select(pipe, fifo, 0);
 474         usbhsf_fifo_clear(pipe, fifo);
 475         usbhsf_fifo_unselect(pipe, fifo);
 476
 477         /*
 478          * change handler to PIO pop
 479          */
 480         pkt->handler = &usbhs_fifo_pio_pop_handler;
 481
 482         return pkt->handler->prepare(pkt, is_done);
 483 }
 484
 485 const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
 486         .prepare = usbhsf_dcp_data_stage_prepare_pop,
 487 };
 488
 489 /*
 490  *              PIO push handler
 491  */
 492 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 493 {
 494         struct usbhs_pipe *pipe = pkt->pipe;
 495         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 496         struct device *dev = usbhs_priv_to_dev(priv);
 497         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 498         void __iomem *addr = priv->base + fifo->port;
 499         u8 *buf;
 500         int maxp = usbhs_pipe_get_maxpacket(pipe);
 501         int total_len;
 502         int i, ret, len;
 503         int is_short;
 504
 505         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 506         pkt->sequence = -1; /* -1 sequence will be ignored */
 507
 508         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 509
 510         ret = usbhsf_fifo_select(pipe, fifo, 1);
 511         if (ret < 0)
 512                 return 0;
 513
 514         ret = usbhs_pipe_is_accessible(pipe);
 515         if (ret < 0) {
 516                 /* inaccessible pipe is not an error */
 517                 ret = 0;
 518                 goto usbhs_fifo_write_busy;
 519         }
 520
 521         ret = usbhsf_fifo_barrier(priv, fifo);
 522         if (ret < 0)
 523                 goto usbhs_fifo_write_busy;
 524
 525         buf             = pkt->buf    + pkt->actual;
 526         len             = pkt->length - pkt->actual;
 527         len             = min(len, maxp);
 528         total_len       = len;
 529         is_short        = total_len < maxp;
 530
 531         /*
 532          * FIXME
 533          *
 534          * 32-bit access only
 535          */
 536         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 537                 iowrite32_rep(addr, buf, len / 4);
 538                 len %= 4;
 539                 buf += total_len - len;
 540         }
 541
 542         /* the rest operation */
 543         if (usbhs_get_dparam(priv, cfifo_byte_addr)) {
 544                 for (i = 0; i < len; i++)
 545                         iowrite8(buf[i], addr + (i & 0x03));
 546         } else {
 547                 for (i = 0; i < len; i++)
 548                         iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
 549         }
 550
 551         /*
 552          * variable update
 553          */
 554         pkt->actual += total_len;
 555
 556         if (pkt->actual < pkt->length)
 557                 *is_done = 0;           /* there are remainder data */
 558         else if (is_short)
 559                 *is_done = 1;           /* short packet */
 560         else
 561                 *is_done = !pkt->zero;  /* send zero packet ? */
 562
 563         /*
 564          * pipe/irq handling
 565          */
 566         if (is_short)
 567                 usbhsf_send_terminator(pipe, fifo);
 568
 569         usbhsf_tx_irq_ctrl(pipe, !*is_done);
 570         usbhs_pipe_running(pipe, !*is_done);
 571         usbhs_pipe_enable(pipe);
 572
 573         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 574                 usbhs_pipe_number(pipe),
 575                 pkt->length, pkt->actual, *is_done, pkt->zero);
 576
 577         usbhsf_fifo_unselect(pipe, fifo);
 578
 579         return 0;
 580
 581 usbhs_fifo_write_busy:
 582         usbhsf_fifo_unselect(pipe, fifo);
 583
 584         /*
 585          * pipe is busy.
 586          * retry in interrupt
 587          */
 588         usbhsf_tx_irq_ctrl(pipe, 1);
 589         usbhs_pipe_running(pipe, 1);
 590
 591         return ret;
 592 }
 593
 594 static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 595 {
 596         if (usbhs_pipe_is_running(pkt->pipe))
 597                 return 0;
 598
 599         return usbhsf_pio_try_push(pkt, is_done);
 600 }
 601
 602 const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
 603         .prepare = usbhsf_pio_prepare_push,
 604         .try_run = usbhsf_pio_try_push,
 605 };
 606
 607 /*
 608  *              PIO pop handler
 609  */
 610 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 611 {
 612         struct usbhs_pipe *pipe = pkt->pipe;
 613         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 614         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 615
 616         if (usbhs_pipe_is_busy(pipe))
 617                 return 0;
 618
 619         if (usbhs_pipe_is_running(pipe))
 620                 return 0;
 621
 622         /*
 623          * pipe enable to prepare packet receive
 624          */
 625         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 626         pkt->sequence = -1; /* -1 sequence will be ignored */
 627
 628         if (usbhs_pipe_is_dcp(pipe))
 629                 usbhsf_fifo_clear(pipe, fifo);
 630
 631         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 632         usbhs_pipe_enable(pipe);
 633         usbhs_pipe_running(pipe, 1);
 634         usbhsf_rx_irq_ctrl(pipe, 1);
 635
 636         return 0;
 637 }
 638
 639 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 640 {
 641         struct usbhs_pipe *pipe = pkt->pipe;
 642         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 643         struct device *dev = usbhs_priv_to_dev(priv);
 644         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 645         void __iomem *addr = priv->base + fifo->port;
 646         u8 *buf;
 647         u32 data = 0;
 648         int maxp = usbhs_pipe_get_maxpacket(pipe);
 649         int rcv_len, len;
 650         int i, ret;
 651         int total_len = 0;
 652
 653         ret = usbhsf_fifo_select(pipe, fifo, 0);
 654         if (ret < 0)
 655                 return 0;
 656
 657         ret = usbhsf_fifo_barrier(priv, fifo);
 658         if (ret < 0)
 659                 goto usbhs_fifo_read_busy;
 660
 661         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 662
 663         buf             = pkt->buf    + pkt->actual;
 664         len             = pkt->length - pkt->actual;
 665         len             = min(len, rcv_len);
 666         total_len       = len;
 667
 668         /*
 669          * update actual length first here to decide disable pipe.
 670          * if this pipe keeps BUF status and all data were popped,
 671          * then, next interrupt/token will be issued again
 672          */
 673         pkt->actual += total_len;
 674
 675         if ((pkt->actual == pkt->length) ||     /* receive all data */
 676             (total_len < maxp)) {               /* short packet */
 677                 *is_done = 1;
 678                 usbhsf_rx_irq_ctrl(pipe, 0);
 679                 usbhs_pipe_running(pipe, 0);
 680                 /*
 681                  * If function mode, since this controller is possible to enter
 682                  * Control Write status stage at this timing, this driver
 683                  * should not disable the pipe. If such a case happens, this
 684                  * controller is not able to complete the status stage.
 685                  */
 686                 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
 687                         usbhs_pipe_disable(pipe);       /* disable pipe first */
 688         }
 689
 690         /*
 691          * Buffer clear if Zero-Length packet
 692          *
 693          * see
 694          * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
 695          */
 696         if (0 == rcv_len) {
 697                 pkt->zero = 1;
 698                 usbhsf_fifo_clear(pipe, fifo);
 699                 goto usbhs_fifo_read_end;
 700         }
 701
 702         /*
 703          * FIXME
 704          *
 705          * 32-bit access only
 706          */
 707         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 708                 ioread32_rep(addr, buf, len / 4);
 709                 len %= 4;
 710                 buf += total_len - len;
 711         }
 712
 713         /* the rest operation */
 714         for (i = 0; i < len; i++) {
 715                 if (!(i & 0x03))
 716                         data = ioread32(addr);
 717
 718                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
 719         }
 720
 721 usbhs_fifo_read_end:
 722         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 723                 usbhs_pipe_number(pipe),
 724                 pkt->length, pkt->actual, *is_done, pkt->zero);
 725
 726 usbhs_fifo_read_busy:
 727         usbhsf_fifo_unselect(pipe, fifo);
 728
 729         return ret;
 730 }
 731
 732 const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
 733         .prepare = usbhsf_prepare_pop,
 734         .try_run = usbhsf_pio_try_pop,
 735 };
 736
 737 /*
 738  *              DCP ctrol statge handler
 739  */
 740 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 741 {
 742         usbhs_dcp_control_transfer_done(pkt->pipe);
 743
 744         *is_done = 1;
 745
 746         return 0;
 747 }
 748
 749 const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
 750         .prepare = usbhsf_ctrl_stage_end,
 751         .try_run = usbhsf_ctrl_stage_end,
 752 };
 753
 754 /*
 755  *              DMA fifo functions
 756  */
 757 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 758                                             struct usbhs_pkt *pkt)
 759 {
 760         if (&usbhs_fifo_dma_push_handler == pkt->handler)
 761                 return fifo->tx_chan;
 762
 763         if (&usbhs_fifo_dma_pop_handler == pkt->handler)
 764                 return fifo->rx_chan;
 765
 766         return NULL;
 767 }
 768
 769 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
 770                                               struct usbhs_pkt *pkt)
 771 {
 772         struct usbhs_fifo *fifo;
 773         int i;
 774
 775         usbhs_for_each_dfifo(priv, fifo, i) {
 776                 if (usbhsf_dma_chan_get(fifo, pkt) &&
 777                     !usbhsf_fifo_is_busy(fifo))
 778                         return fifo;
 779         }
 780
 781         return NULL;
 782 }
 783
 784 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 785 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 786 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
 787                               struct usbhs_fifo *fifo,
 788                               u16 dreqe)
 789 {
 790         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 791
 792         usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 793 }
 794
 795 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 796 {
 797         struct usbhs_pipe *pipe = pkt->pipe;
 798         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 799         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 800         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 801         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 802
 803         return info->dma_map_ctrl(chan->device->dev, pkt, map);
 804 }
 805
 806 static void usbhsf_dma_complete(void *arg);
 807 static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
 808 {
 809         struct usbhs_pipe *pipe = pkt->pipe;
 810         struct usbhs_fifo *fifo;
 811         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 812         struct dma_async_tx_descriptor *desc;
 813         struct dma_chan *chan;
 814         struct device *dev = usbhs_priv_to_dev(priv);
 815         enum dma_transfer_direction dir;
 816
 817         fifo = usbhs_pipe_to_fifo(pipe);
 818         if (!fifo)
 819                 return;
 820
 821         chan = usbhsf_dma_chan_get(fifo, pkt);
 822         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 823
 824         desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
 825                                         pkt->trans, dir,
 826                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 827         if (!desc)
 828                 return;
 829
 830         desc->callback          = usbhsf_dma_complete;
 831         desc->callback_param    = pipe;
 832
 833         pkt->cookie = dmaengine_submit(desc);
 834         if (pkt->cookie < 0) {
 835                 dev_err(dev, "Failed to submit dma descriptor\n");
 836                 return;
 837         }
 838
 839         dev_dbg(dev, "  %s %d (%d/ %d)\n",
 840                 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 841
 842         usbhs_pipe_running(pipe, 1);
 843         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 844         dma_async_issue_pending(chan);
 845         usbhsf_dma_start(pipe, fifo);
 846         usbhs_pipe_enable(pipe);
 847 }
 848
 849 static void xfer_work(struct work_struct *work)
 850 {
 851         struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
 852         struct usbhs_pipe *pipe = pkt->pipe;
 853         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 854         unsigned long flags;
 855
 856         usbhs_lock(priv, flags);
 857         usbhsf_dma_xfer_preparing(pkt);
 858         usbhs_unlock(priv, flags);
 859 }
 860
 861 /*
 862  *              DMA push handler
 863  */
 864 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 865 {
 866         struct usbhs_pipe *pipe = pkt->pipe;
 867         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 868         struct usbhs_fifo *fifo;
 869         int len = pkt->length - pkt->actual;
 870         int ret;
 871         uintptr_t align_mask;
 872
 873         if (usbhs_pipe_is_busy(pipe))
 874                 return 0;
 875
 876         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 877         if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
 878             usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
 879                 goto usbhsf_pio_prepare_push;
 880
 881         /* check data length if this driver don't use USB-DMAC */
 882         if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
 883                 goto usbhsf_pio_prepare_push;
 884
 885         /* check buffer alignment */
 886         align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
 887                                         USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
 888         if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
 889                 goto usbhsf_pio_prepare_push;
 890
 891         /* return at this time if the pipe is running */
 892         if (usbhs_pipe_is_running(pipe))
 893                 return 0;
 894
 895         /* get enable DMA fifo */
 896         fifo = usbhsf_get_dma_fifo(priv, pkt);
 897         if (!fifo)
 898                 goto usbhsf_pio_prepare_push;
 899
 900         ret = usbhsf_fifo_select(pipe, fifo, 0);
 901         if (ret < 0)
 902                 goto usbhsf_pio_prepare_push;
 903
 904         if (usbhsf_dma_map(pkt) < 0)
 905                 goto usbhsf_pio_prepare_push_unselect;
 906
 907         pkt->trans = len;
 908
 909         usbhsf_tx_irq_ctrl(pipe, 0);
 910         /* FIXME: Workaound for usb dmac that driver can be used in atomic */
 911         if (usbhs_get_dparam(priv, has_usb_dmac)) {
 912                 usbhsf_dma_xfer_preparing(pkt);
 913         } else {
 914                 INIT_WORK(&pkt->work, xfer_work);
 915                 schedule_work(&pkt->work);
 916         }
 917
 918         return 0;
 919
 920 usbhsf_pio_prepare_push_unselect:
 921         usbhsf_fifo_unselect(pipe, fifo);
 922 usbhsf_pio_prepare_push:
 923         /*
 924          * change handler to PIO
 925          */
 926         pkt->handler = &usbhs_fifo_pio_push_handler;
 927
 928         return pkt->handler->prepare(pkt, is_done);
 929 }
 930
 931 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 932 {
 933         struct usbhs_pipe *pipe = pkt->pipe;
 934         int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
 935
 936         pkt->actual += pkt->trans;
 937
 938         if (pkt->actual < pkt->length)
 939                 *is_done = 0;           /* there are remainder data */
 940         else if (is_short)
 941                 *is_done = 1;           /* short packet */
 942         else
 943                 *is_done = !pkt->zero;  /* send zero packet? */
 944
 945         usbhs_pipe_running(pipe, !*is_done);
 946
 947         usbhsf_dma_stop(pipe, pipe->fifo);
 948         usbhsf_dma_unmap(pkt);
 949         usbhsf_fifo_unselect(pipe, pipe->fifo);
 950
 951         if (!*is_done) {
 952                 /* change handler to PIO */
 953                 pkt->handler = &usbhs_fifo_pio_push_handler;
 954                 return pkt->handler->try_run(pkt, is_done);
 955         }
 956
 957         return 0;
 958 }
 959
 960 const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
 961         .prepare        = usbhsf_dma_prepare_push,
 962         .dma_done       = usbhsf_dma_push_done,
 963 };
 964
 965 /*
 966  *              DMA pop handler
 967  */
 968
 969 static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
 970                                               int *is_done)
 971 {
 972         return usbhsf_prepare_pop(pkt, is_done);
 973 }
 974
 975 static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
 976                                                 int *is_done)
 977 {
 978         struct usbhs_pipe *pipe = pkt->pipe;
 979         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 980         struct usbhs_fifo *fifo;
 981         int ret;
 982
 983         if (usbhs_pipe_is_busy(pipe))
 984                 return 0;
 985
 986         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 987         if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
 988             usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
 989                 goto usbhsf_pio_prepare_pop;
 990
 991         fifo = usbhsf_get_dma_fifo(priv, pkt);
 992         if (!fifo)
 993                 goto usbhsf_pio_prepare_pop;
 994
 995         if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
 996                 goto usbhsf_pio_prepare_pop;
 997
 998         /* return at this time if the pipe is running */
 999         if (usbhs_pipe_is_running(pipe))
1000                 return 0;
1001
1002         usbhs_pipe_config_change_bfre(pipe, 1);
1003
1004         ret = usbhsf_fifo_select(pipe, fifo, 0);
1005         if (ret < 0)
1006                 goto usbhsf_pio_prepare_pop;
1007
1008         if (usbhsf_dma_map(pkt) < 0)
1009                 goto usbhsf_pio_prepare_pop_unselect;
1010
1011         /* DMA */
1012
1013         /*
1014          * usbhs_fifo_dma_pop_handler :: prepare
1015          * enabled irq to come here.
1016          * but it is no longer needed for DMA. disable it.
1017          */
1018         usbhsf_rx_irq_ctrl(pipe, 0);
1019
1020         pkt->trans = pkt->length;
1021
1022         usbhsf_dma_xfer_preparing(pkt);
1023
1024         return 0;
1025
1026 usbhsf_pio_prepare_pop_unselect:
1027         usbhsf_fifo_unselect(pipe, fifo);
1028 usbhsf_pio_prepare_pop:
1029
1030         /*
1031          * change handler to PIO
1032          */
1033         pkt->handler = &usbhs_fifo_pio_pop_handler;
1034         usbhs_pipe_config_change_bfre(pipe, 0);
1035
1036         return pkt->handler->prepare(pkt, is_done);
1037 }
1038
1039 static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1040 {
1041         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1042
1043         if (usbhs_get_dparam(priv, has_usb_dmac))
1044                 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1045         else
1046                 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1047 }
1048
1049 static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1050 {
1051         struct usbhs_pipe *pipe = pkt->pipe;
1052         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1053         struct usbhs_fifo *fifo;
1054         int len, ret;
1055
1056         if (usbhs_pipe_is_busy(pipe))
1057                 return 0;
1058
1059         if (usbhs_pipe_is_dcp(pipe))
1060                 goto usbhsf_pio_prepare_pop;
1061
1062         /* get enable DMA fifo */
1063         fifo = usbhsf_get_dma_fifo(priv, pkt);
1064         if (!fifo)
1065                 goto usbhsf_pio_prepare_pop;
1066
1067         if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1068                 goto usbhsf_pio_prepare_pop;
1069
1070         ret = usbhsf_fifo_select(pipe, fifo, 0);
1071         if (ret < 0)
1072                 goto usbhsf_pio_prepare_pop;
1073
1074         /* use PIO if packet is less than pio_dma_border */
1075         len = usbhsf_fifo_rcv_len(priv, fifo);
1076         len = min(pkt->length - pkt->actual, len);
1077         if (len & 0x7) /* 8byte alignment */
1078                 goto usbhsf_pio_prepare_pop_unselect;
1079
1080         if (len < usbhs_get_dparam(priv, pio_dma_border))
1081                 goto usbhsf_pio_prepare_pop_unselect;
1082
1083         ret = usbhsf_fifo_barrier(priv, fifo);
1084         if (ret < 0)
1085                 goto usbhsf_pio_prepare_pop_unselect;
1086
1087         if (usbhsf_dma_map(pkt) < 0)
1088                 goto usbhsf_pio_prepare_pop_unselect;
1089
1090         /* DMA */
1091
1092         /*
1093          * usbhs_fifo_dma_pop_handler :: prepare
1094          * enabled irq to come here.
1095          * but it is no longer needed for DMA. disable it.
1096          */
1097         usbhsf_rx_irq_ctrl(pipe, 0);
1098
1099         pkt->trans = len;
1100
1101         INIT_WORK(&pkt->work, xfer_work);
1102         schedule_work(&pkt->work);
1103
1104         return 0;
1105
1106 usbhsf_pio_prepare_pop_unselect:
1107         usbhsf_fifo_unselect(pipe, fifo);
1108 usbhsf_pio_prepare_pop:
1109
1110         /*
1111          * change handler to PIO
1112          */
1113         pkt->handler = &usbhs_fifo_pio_pop_handler;
1114
1115         return pkt->handler->try_run(pkt, is_done);
1116 }
1117
1118 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1119 {
1120         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1121
1122         BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1123
1124         return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1125 }
1126
1127 static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1128 {
1129         struct usbhs_pipe *pipe = pkt->pipe;
1130         int maxp = usbhs_pipe_get_maxpacket(pipe);
1131
1132         usbhsf_dma_stop(pipe, pipe->fifo);
1133         usbhsf_dma_unmap(pkt);
1134         usbhsf_fifo_unselect(pipe, pipe->fifo);
1135
1136         pkt->actual += pkt->trans;
1137
1138         if ((pkt->actual == pkt->length) ||     /* receive all data */
1139             (pkt->trans < maxp)) {              /* short packet */
1140                 *is_done = 1;
1141                 usbhs_pipe_running(pipe, 0);
1142         } else {
1143                 /* re-enable */
1144                 usbhs_pipe_running(pipe, 0);
1145                 usbhsf_prepare_pop(pkt, is_done);
1146         }
1147
1148         return 0;
1149 }
1150
1151 static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1152                                            struct dma_chan *chan, int dtln)
1153 {
1154         struct usbhs_pipe *pipe = pkt->pipe;
1155         struct dma_tx_state state;
1156         size_t received_size;
1157         int maxp = usbhs_pipe_get_maxpacket(pipe);
1158
1159         dmaengine_tx_status(chan, pkt->cookie, &state);
1160         received_size = pkt->length - state.residue;
1161
1162         if (dtln) {
1163                 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1164                 received_size &= ~(maxp - 1);
1165                 received_size += dtln;
1166         }
1167
1168         return received_size;
1169 }
1170
1171 static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1172                                              int *is_done)
1173 {
1174         struct usbhs_pipe *pipe = pkt->pipe;
1175         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1176         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1177         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1178         int rcv_len;
1179
1180         /*
1181          * Since the driver disables rx_irq in DMA mode, the interrupt handler
1182          * cannot the BRDYSTS. So, the function clears it here because the
1183          * driver may use PIO mode next time.
1184          */
1185         usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1186
1187         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1188         usbhsf_fifo_clear(pipe, fifo);
1189         pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1190
1191         usbhs_pipe_running(pipe, 0);
1192         usbhsf_dma_stop(pipe, fifo);
1193         usbhsf_dma_unmap(pkt);
1194         usbhsf_fifo_unselect(pipe, pipe->fifo);
1195
1196         /* The driver can assume the rx transaction is always "done" */
1197         *is_done = 1;
1198
1199         return 0;
1200 }
1201
1202 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1203 {
1204         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1205
1206         if (usbhs_get_dparam(priv, has_usb_dmac))
1207                 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1208         else
1209                 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1210 }
1211
1212 const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1213         .prepare        = usbhsf_dma_prepare_pop,
1214         .try_run        = usbhsf_dma_try_pop,
1215         .dma_done       = usbhsf_dma_pop_done
1216 };
1217
1218 /*
1219  *              DMA setting
1220  */
1221 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1222 {
1223         struct sh_dmae_slave *slave = param;
1224
1225         /*
1226          * FIXME
1227          *
1228          * usbhs doesn't recognize id = 0 as valid DMA
1229          */
1230         if (0 == slave->shdma_slave.slave_id)
1231                 return false;
1232
1233         chan->private = slave;
1234
1235         return true;
1236 }
1237
1238 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1239 {
1240         if (fifo->tx_chan)
1241                 dma_release_channel(fifo->tx_chan);
1242         if (fifo->rx_chan)
1243                 dma_release_channel(fifo->rx_chan);
1244
1245         fifo->tx_chan = NULL;
1246         fifo->rx_chan = NULL;
1247 }
1248
1249 static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1250 {
1251         dma_cap_mask_t mask;
1252
1253         dma_cap_zero(mask);
1254         dma_cap_set(DMA_SLAVE, mask);
1255         fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1256                                             &fifo->tx_slave);
1257
1258         dma_cap_zero(mask);
1259         dma_cap_set(DMA_SLAVE, mask);
1260         fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1261                                             &fifo->rx_slave);
1262 }
1263
1264 static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1265                                int channel)
1266 {
1267         char name[16];
1268
1269         /*
1270          * To avoid complex handing for DnFIFOs, the driver uses each
1271          * DnFIFO as TX or RX direction (not bi-direction).
1272          * So, the driver uses odd channels for TX, even channels for RX.
1273          */
1274         snprintf(name, sizeof(name), "ch%d", channel);
1275         if (channel & 1) {
1276                 fifo->tx_chan = dma_request_chan(dev, name);
1277                 if (IS_ERR(fifo->tx_chan))
1278                         fifo->tx_chan = NULL;
1279         } else {
1280                 fifo->rx_chan = dma_request_chan(dev, name);
1281                 if (IS_ERR(fifo->rx_chan))
1282                         fifo->rx_chan = NULL;
1283         }
1284 }
1285
1286 static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1287                             int channel)
1288 {
1289         struct device *dev = usbhs_priv_to_dev(priv);
1290
1291         if (dev_of_node(dev))
1292                 usbhsf_dma_init_dt(dev, fifo, channel);
1293         else
1294                 usbhsf_dma_init_pdev(fifo);
1295
1296         if (fifo->tx_chan || fifo->rx_chan)
1297                 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1298                          fifo->name,
1299                          fifo->tx_chan ? "[TX]" : "    ",
1300                          fifo->rx_chan ? "[RX]" : "    ");
1301 }
1302
1303 /*
1304  *              irq functions
1305  */
1306 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1307                             struct usbhs_irq_state *irq_state)
1308 {
1309         struct usbhs_pipe *pipe;
1310         struct device *dev = usbhs_priv_to_dev(priv);
1311         int i, ret;
1312
1313         if (!irq_state->bempsts) {
1314                 dev_err(dev, "debug %s !!\n", __func__);
1315                 return -EIO;
1316         }
1317
1318         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1319
1320         /*
1321          * search interrupted "pipe"
1322          * not "uep".
1323          */
1324         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1325                 if (!(irq_state->bempsts & (1 << i)))
1326                         continue;
1327
1328                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1329                 if (ret < 0)
1330                         dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1331         }
1332
1333         return 0;
1334 }
1335
1336 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1337                             struct usbhs_irq_state *irq_state)
1338 {
1339         struct usbhs_pipe *pipe;
1340         struct device *dev = usbhs_priv_to_dev(priv);
1341         int i, ret;
1342
1343         if (!irq_state->brdysts) {
1344                 dev_err(dev, "debug %s !!\n", __func__);
1345                 return -EIO;
1346         }
1347
1348         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1349
1350         /*
1351          * search interrupted "pipe"
1352          * not "uep".
1353          */
1354         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1355                 if (!(irq_state->brdysts & (1 << i)))
1356                         continue;
1357
1358                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1359                 if (ret < 0)
1360                         dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1361         }
1362
1363         return 0;
1364 }
1365
1366 static void usbhsf_dma_complete(void *arg)
1367 {
1368         struct usbhs_pipe *pipe = arg;
1369         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1370         struct device *dev = usbhs_priv_to_dev(priv);
1371         int ret;
1372
1373         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1374         if (ret < 0)
1375                 dev_err(dev, "dma_complete run_error %d : %d\n",
1376                         usbhs_pipe_number(pipe), ret);
1377 }
1378
1379 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1380 {
1381         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1382         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1383
1384         /* clear DCP FIFO of transmission */
1385         if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1386                 return;
1387         usbhsf_fifo_clear(pipe, fifo);
1388         usbhsf_fifo_unselect(pipe, fifo);
1389
1390         /* clear DCP FIFO of reception */
1391         if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1392                 return;
1393         usbhsf_fifo_clear(pipe, fifo);
1394         usbhsf_fifo_unselect(pipe, fifo);
1395 }
1396
1397 /*
1398  *              fifo init
1399  */
1400 void usbhs_fifo_init(struct usbhs_priv *priv)
1401 {
1402         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1403         struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1404         struct usbhs_fifo *dfifo;
1405         int i;
1406
1407         mod->irq_empty          = usbhsf_irq_empty;
1408         mod->irq_ready          = usbhsf_irq_ready;
1409         mod->irq_bempsts        = 0;
1410         mod->irq_brdysts        = 0;
1411
1412         cfifo->pipe     = NULL;
1413         usbhs_for_each_dfifo(priv, dfifo, i)
1414                 dfifo->pipe     = NULL;
1415 }
1416
1417 void usbhs_fifo_quit(struct usbhs_priv *priv)
1418 {
1419         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1420
1421         mod->irq_empty          = NULL;
1422         mod->irq_ready          = NULL;
1423         mod->irq_bempsts        = 0;
1424         mod->irq_brdysts        = 0;
1425 }
1426
1427 #define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port)              \
1428 do {                                                                    \
1429         fifo = usbhsf_get_dnfifo(priv, channel);                        \
1430         fifo->name      = "D"#channel"FIFO";                            \
1431         fifo->port      = fifo_port;                                    \
1432         fifo->sel       = D##channel##FIFOSEL;                          \
1433         fifo->ctr       = D##channel##FIFOCTR;                          \
1434         fifo->tx_slave.shdma_slave.slave_id =                           \
1435                         usbhs_get_dparam(priv, d##channel##_tx_id);     \
1436         fifo->rx_slave.shdma_slave.slave_id =                           \
1437                         usbhs_get_dparam(priv, d##channel##_rx_id);     \
1438         usbhsf_dma_init(priv, fifo, channel);                           \
1439 } while (0)
1440
1441 #define USBHS_DFIFO_INIT(priv, fifo, channel)                           \
1442                 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1443 #define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel)                   \
1444                 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1445
1446 int usbhs_fifo_probe(struct usbhs_priv *priv)
1447 {
1448         struct usbhs_fifo *fifo;
1449
1450         /* CFIFO */
1451         fifo = usbhsf_get_cfifo(priv);
1452         fifo->name      = "CFIFO";
1453         fifo->port      = CFIFO;
1454         fifo->sel       = CFIFOSEL;
1455         fifo->ctr       = CFIFOCTR;
1456
1457         /* DFIFO */
1458         USBHS_DFIFO_INIT(priv, fifo, 0);
1459         USBHS_DFIFO_INIT(priv, fifo, 1);
1460         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1461         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1462
1463         return 0;
1464 }
1465
1466 void usbhs_fifo_remove(struct usbhs_priv *priv)
1467 {
1468         struct usbhs_fifo *fifo;
1469         int i;
1470
1471         usbhs_for_each_dfifo(priv, fifo, i)
1472                 usbhsf_dma_quit(priv, fifo);
1473 }