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 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
 105 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable);
 106 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
 107 {
 108         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 109         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 110         unsigned long flags;
 111
 112         /********************  spin lock ********************/
 113         usbhs_lock(priv, flags);
 114
 115         usbhs_pipe_disable(pipe);
 116
 117         if (!pkt)
 118                 pkt = __usbhsf_pkt_get(pipe);
 119
 120         if (pkt) {
 121                 struct dma_chan *chan = NULL;
 122
 123                 if (fifo)
 124                         chan = usbhsf_dma_chan_get(fifo, pkt);
 125                 if (chan) {
 126                         dmaengine_terminate_all(chan);
 127                         usbhsf_dma_unmap(pkt);
 128                 } else {
 129                         if (usbhs_pipe_is_dir_in(pipe))
 130                                 usbhsf_rx_irq_ctrl(pipe, 0);
 131                         else
 132                                 usbhsf_tx_irq_ctrl(pipe, 0);
 133                 }
 134
 135                 usbhs_pipe_clear_without_sequence(pipe, 0, 0);
 136                 usbhs_pipe_running(pipe, 0);
 137
 138                 __usbhsf_pkt_del(pkt);
 139         }
 140
 141         if (fifo)
 142                 usbhsf_fifo_unselect(pipe, fifo);
 143
 144         usbhs_unlock(priv, flags);
 145         /********************  spin unlock ******************/
 146
 147         return pkt;
 148 }
 149
 150 enum {
 151         USBHSF_PKT_PREPARE,
 152         USBHSF_PKT_TRY_RUN,
 153         USBHSF_PKT_DMA_DONE,
 154 };
 155
 156 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
 157 {
 158         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 159         struct usbhs_pkt *pkt;
 160         struct device *dev = usbhs_priv_to_dev(priv);
 161         int (*func)(struct usbhs_pkt *pkt, int *is_done);
 162         unsigned long flags;
 163         int ret = 0;
 164         int is_done = 0;
 165
 166         /********************  spin lock ********************/
 167         usbhs_lock(priv, flags);
 168
 169         pkt = __usbhsf_pkt_get(pipe);
 170         if (!pkt) {
 171                 ret = -EINVAL;
 172                 goto __usbhs_pkt_handler_end;
 173         }
 174
 175         switch (type) {
 176         case USBHSF_PKT_PREPARE:
 177                 func = pkt->handler->prepare;
 178                 break;
 179         case USBHSF_PKT_TRY_RUN:
 180                 func = pkt->handler->try_run;
 181                 break;
 182         case USBHSF_PKT_DMA_DONE:
 183                 func = pkt->handler->dma_done;
 184                 break;
 185         default:
 186                 dev_err(dev, "unknown pkt handler\n");
 187                 goto __usbhs_pkt_handler_end;
 188         }
 189
 190         if (likely(func))
 191                 ret = func(pkt, &is_done);
 192
 193         if (is_done)
 194                 __usbhsf_pkt_del(pkt);
 195
 196 __usbhs_pkt_handler_end:
 197         usbhs_unlock(priv, flags);
 198         /********************  spin unlock ******************/
 199
 200         if (is_done) {
 201                 pkt->done(priv, pkt);
 202                 usbhs_pkt_start(pipe);
 203         }
 204
 205         return ret;
 206 }
 207
 208 void usbhs_pkt_start(struct usbhs_pipe *pipe)
 209 {
 210         usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
 211 }
 212
 213 /*
 214  *              irq enable/disable function
 215  */
 216 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
 217 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
 218 #define usbhsf_irq_callback_ctrl(pipe, status, enable)                  \
 219         ({                                                              \
 220                 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);     \
 221                 struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
 222                 u16 status = (1 << usbhs_pipe_number(pipe));            \
 223                 if (!mod)                                               \
 224                         return;                                         \
 225                 if (enable)                                             \
 226                         mod->status |= status;                          \
 227                 else                                                    \
 228                         mod->status &= ~status;                         \
 229                 usbhs_irq_callback_update(priv, mod);                   \
 230         })
 231
 232 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 233 {
 234         /*
 235          * And DCP pipe can NOT use "ready interrupt" for "send"
 236          * it should use "empty" interrupt.
 237          * see
 238          *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
 239          *
 240          * on the other hand, normal pipe can use "ready interrupt" for "send"
 241          * even though it is single/double buffer
 242          */
 243         if (usbhs_pipe_is_dcp(pipe))
 244                 usbhsf_irq_empty_ctrl(pipe, enable);
 245         else
 246                 usbhsf_irq_ready_ctrl(pipe, enable);
 247 }
 248
 249 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 250 {
 251         usbhsf_irq_ready_ctrl(pipe, enable);
 252 }
 253
 254 /*
 255  *              FIFO ctrl
 256  */
 257 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
 258                                    struct usbhs_fifo *fifo)
 259 {
 260         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 261
 262         usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
 263 }
 264
 265 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
 266                                struct usbhs_fifo *fifo)
 267 {
 268         /* The FIFO port is accessible */
 269         if (usbhs_read(priv, fifo->ctr) & FRDY)
 270                 return 0;
 271
 272         return -EBUSY;
 273 }
 274
 275 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
 276                               struct usbhs_fifo *fifo)
 277 {
 278         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 279         int ret = 0;
 280
 281         if (!usbhs_pipe_is_dcp(pipe)) {
 282                 /*
 283                  * This driver checks the pipe condition first to avoid -EBUSY
 284                  * from usbhsf_fifo_barrier() if the pipe is RX direction and
 285                  * empty.
 286                  */
 287                 if (usbhs_pipe_is_dir_in(pipe))
 288                         ret = usbhs_pipe_is_accessible(pipe);
 289                 if (!ret)
 290                         ret = usbhsf_fifo_barrier(priv, fifo);
 291         }
 292
 293         /*
 294          * if non-DCP pipe, this driver should set BCLR when
 295          * usbhsf_fifo_barrier() returns 0.
 296          */
 297         if (!ret)
 298                 usbhs_write(priv, fifo->ctr, BCLR);
 299 }
 300
 301 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
 302                                struct usbhs_fifo *fifo)
 303 {
 304         return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
 305 }
 306
 307 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
 308                                  struct usbhs_fifo *fifo)
 309 {
 310         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 311
 312         usbhs_pipe_select_fifo(pipe, NULL);
 313         usbhs_write(priv, fifo->sel, 0);
 314 }
 315
 316 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
 317                               struct usbhs_fifo *fifo,
 318                               int write)
 319 {
 320         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 321         struct device *dev = usbhs_priv_to_dev(priv);
 322         int timeout = 1024;
 323         u16 mask = ((1 << 5) | 0xF);            /* mask of ISEL | CURPIPE */
 324         u16 base = usbhs_pipe_number(pipe);     /* CURPIPE */
 325
 326         if (usbhs_pipe_is_busy(pipe) ||
 327             usbhsf_fifo_is_busy(fifo))
 328                 return -EBUSY;
 329
 330         if (usbhs_pipe_is_dcp(pipe)) {
 331                 base |= (1 == write) << 5;      /* ISEL */
 332
 333                 if (usbhs_mod_is_host(priv))
 334                         usbhs_dcp_dir_for_host(pipe, write);
 335         }
 336
 337         /* "base" will be used below  */
 338         usbhs_write(priv, fifo->sel, base | MBW_32);
 339
 340         /* check ISEL and CURPIPE value */
 341         while (timeout--) {
 342                 if (base == (mask & usbhs_read(priv, fifo->sel))) {
 343                         usbhs_pipe_select_fifo(pipe, fifo);
 344                         return 0;
 345                 }
 346                 udelay(10);
 347         }
 348
 349         dev_err(dev, "fifo select error\n");
 350
 351         return -EIO;
 352 }
 353
 354 /*
 355  *              DCP status stage
 356  */
 357 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
 358 {
 359         struct usbhs_pipe *pipe = pkt->pipe;
 360         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 361         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 362         struct device *dev = usbhs_priv_to_dev(priv);
 363         int ret;
 364
 365         usbhs_pipe_disable(pipe);
 366
 367         ret = usbhsf_fifo_select(pipe, fifo, 1);
 368         if (ret < 0) {
 369                 dev_err(dev, "%s() failed\n", __func__);
 370                 return ret;
 371         }
 372
 373         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 374
 375         usbhsf_fifo_clear(pipe, fifo);
 376         usbhsf_send_terminator(pipe, fifo);
 377
 378         usbhsf_fifo_unselect(pipe, fifo);
 379
 380         usbhsf_tx_irq_ctrl(pipe, 1);
 381         usbhs_pipe_enable(pipe);
 382
 383         return ret;
 384 }
 385
 386 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
 387 {
 388         struct usbhs_pipe *pipe = pkt->pipe;
 389         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 390         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 391         struct device *dev = usbhs_priv_to_dev(priv);
 392         int ret;
 393
 394         usbhs_pipe_disable(pipe);
 395
 396         ret = usbhsf_fifo_select(pipe, fifo, 0);
 397         if (ret < 0) {
 398                 dev_err(dev, "%s() fail\n", __func__);
 399                 return ret;
 400         }
 401
 402         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 403         usbhsf_fifo_clear(pipe, fifo);
 404
 405         usbhsf_fifo_unselect(pipe, fifo);
 406
 407         usbhsf_rx_irq_ctrl(pipe, 1);
 408         usbhs_pipe_enable(pipe);
 409
 410         return ret;
 411
 412 }
 413
 414 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
 415 {
 416         struct usbhs_pipe *pipe = pkt->pipe;
 417
 418         if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
 419                 usbhsf_tx_irq_ctrl(pipe, 0);
 420         else
 421                 usbhsf_rx_irq_ctrl(pipe, 0);
 422
 423         pkt->actual = pkt->length;
 424         *is_done = 1;
 425
 426         return 0;
 427 }
 428
 429 const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
 430         .prepare = usbhs_dcp_dir_switch_to_write,
 431         .try_run = usbhs_dcp_dir_switch_done,
 432 };
 433
 434 const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
 435         .prepare = usbhs_dcp_dir_switch_to_read,
 436         .try_run = usbhs_dcp_dir_switch_done,
 437 };
 438
 439 /*
 440  *              DCP data stage (push)
 441  */
 442 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
 443 {
 444         struct usbhs_pipe *pipe = pkt->pipe;
 445
 446         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 447
 448         /*
 449          * change handler to PIO push
 450          */
 451         pkt->handler = &usbhs_fifo_pio_push_handler;
 452
 453         return pkt->handler->prepare(pkt, is_done);
 454 }
 455
 456 const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
 457         .prepare = usbhsf_dcp_data_stage_try_push,
 458 };
 459
 460 /*
 461  *              DCP data stage (pop)
 462  */
 463 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
 464                                              int *is_done)
 465 {
 466         struct usbhs_pipe *pipe = pkt->pipe;
 467         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 468         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 469
 470         if (usbhs_pipe_is_busy(pipe))
 471                 return 0;
 472
 473         /*
 474          * prepare pop for DCP should
 475          *  - change DCP direction,
 476          *  - clear fifo
 477          *  - DATA1
 478          */
 479         usbhs_pipe_disable(pipe);
 480
 481         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 482
 483         usbhsf_fifo_select(pipe, fifo, 0);
 484         usbhsf_fifo_clear(pipe, fifo);
 485         usbhsf_fifo_unselect(pipe, fifo);
 486
 487         /*
 488          * change handler to PIO pop
 489          */
 490         pkt->handler = &usbhs_fifo_pio_pop_handler;
 491
 492         return pkt->handler->prepare(pkt, is_done);
 493 }
 494
 495 const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
 496         .prepare = usbhsf_dcp_data_stage_prepare_pop,
 497 };
 498
 499 /*
 500  *              PIO push handler
 501  */
 502 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 503 {
 504         struct usbhs_pipe *pipe = pkt->pipe;
 505         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 506         struct device *dev = usbhs_priv_to_dev(priv);
 507         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 508         void __iomem *addr = priv->base + fifo->port;
 509         u8 *buf;
 510         int maxp = usbhs_pipe_get_maxpacket(pipe);
 511         int total_len;
 512         int i, ret, len;
 513         int is_short;
 514
 515         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 516         pkt->sequence = -1; /* -1 sequence will be ignored */
 517
 518         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 519
 520         ret = usbhsf_fifo_select(pipe, fifo, 1);
 521         if (ret < 0)
 522                 return 0;
 523
 524         ret = usbhs_pipe_is_accessible(pipe);
 525         if (ret < 0) {
 526                 /* inaccessible pipe is not an error */
 527                 ret = 0;
 528                 goto usbhs_fifo_write_busy;
 529         }
 530
 531         ret = usbhsf_fifo_barrier(priv, fifo);
 532         if (ret < 0)
 533                 goto usbhs_fifo_write_busy;
 534
 535         buf             = pkt->buf    + pkt->actual;
 536         len             = pkt->length - pkt->actual;
 537         len             = min(len, maxp);
 538         total_len       = len;
 539         is_short        = total_len < maxp;
 540
 541         /*
 542          * FIXME
 543          *
 544          * 32-bit access only
 545          */
 546         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 547                 iowrite32_rep(addr, buf, len / 4);
 548                 len %= 4;
 549                 buf += total_len - len;
 550         }
 551
 552         /* the rest operation */
 553         if (usbhs_get_dparam(priv, cfifo_byte_addr)) {
 554                 for (i = 0; i < len; i++)
 555                         iowrite8(buf[i], addr + (i & 0x03));
 556         } else {
 557                 for (i = 0; i < len; i++)
 558                         iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
 559         }
 560
 561         /*
 562          * variable update
 563          */
 564         pkt->actual += total_len;
 565
 566         if (pkt->actual < pkt->length)
 567                 *is_done = 0;           /* there are remainder data */
 568         else if (is_short)
 569                 *is_done = 1;           /* short packet */
 570         else
 571                 *is_done = !pkt->zero;  /* send zero packet ? */
 572
 573         /*
 574          * pipe/irq handling
 575          */
 576         if (is_short)
 577                 usbhsf_send_terminator(pipe, fifo);
 578
 579         usbhsf_tx_irq_ctrl(pipe, !*is_done);
 580         usbhs_pipe_running(pipe, !*is_done);
 581         usbhs_pipe_enable(pipe);
 582
 583         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 584                 usbhs_pipe_number(pipe),
 585                 pkt->length, pkt->actual, *is_done, pkt->zero);
 586
 587         usbhsf_fifo_unselect(pipe, fifo);
 588
 589         return 0;
 590
 591 usbhs_fifo_write_busy:
 592         usbhsf_fifo_unselect(pipe, fifo);
 593
 594         /*
 595          * pipe is busy.
 596          * retry in interrupt
 597          */
 598         usbhsf_tx_irq_ctrl(pipe, 1);
 599         usbhs_pipe_running(pipe, 1);
 600
 601         return ret;
 602 }
 603
 604 static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 605 {
 606         if (usbhs_pipe_is_running(pkt->pipe))
 607                 return 0;
 608
 609         return usbhsf_pio_try_push(pkt, is_done);
 610 }
 611
 612 const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
 613         .prepare = usbhsf_pio_prepare_push,
 614         .try_run = usbhsf_pio_try_push,
 615 };
 616
 617 /*
 618  *              PIO pop handler
 619  */
 620 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 621 {
 622         struct usbhs_pipe *pipe = pkt->pipe;
 623         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 624         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 625
 626         if (usbhs_pipe_is_busy(pipe))
 627                 return 0;
 628
 629         if (usbhs_pipe_is_running(pipe))
 630                 return 0;
 631
 632         /*
 633          * pipe enable to prepare packet receive
 634          */
 635         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 636         pkt->sequence = -1; /* -1 sequence will be ignored */
 637
 638         if (usbhs_pipe_is_dcp(pipe))
 639                 usbhsf_fifo_clear(pipe, fifo);
 640
 641         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 642         usbhs_pipe_enable(pipe);
 643         usbhs_pipe_running(pipe, 1);
 644         usbhsf_rx_irq_ctrl(pipe, 1);
 645
 646         return 0;
 647 }
 648
 649 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 650 {
 651         struct usbhs_pipe *pipe = pkt->pipe;
 652         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 653         struct device *dev = usbhs_priv_to_dev(priv);
 654         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 655         void __iomem *addr = priv->base + fifo->port;
 656         u8 *buf;
 657         u32 data = 0;
 658         int maxp = usbhs_pipe_get_maxpacket(pipe);
 659         int rcv_len, len;
 660         int i, ret;
 661         int total_len = 0;
 662
 663         ret = usbhsf_fifo_select(pipe, fifo, 0);
 664         if (ret < 0)
 665                 return 0;
 666
 667         ret = usbhsf_fifo_barrier(priv, fifo);
 668         if (ret < 0)
 669                 goto usbhs_fifo_read_busy;
 670
 671         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 672
 673         buf             = pkt->buf    + pkt->actual;
 674         len             = pkt->length - pkt->actual;
 675         len             = min(len, rcv_len);
 676         total_len       = len;
 677
 678         /*
 679          * update actual length first here to decide disable pipe.
 680          * if this pipe keeps BUF status and all data were popped,
 681          * then, next interrupt/token will be issued again
 682          */
 683         pkt->actual += total_len;
 684
 685         if ((pkt->actual == pkt->length) ||     /* receive all data */
 686             (total_len < maxp)) {               /* short packet */
 687                 *is_done = 1;
 688                 usbhsf_rx_irq_ctrl(pipe, 0);
 689                 usbhs_pipe_running(pipe, 0);
 690                 /*
 691                  * If function mode, since this controller is possible to enter
 692                  * Control Write status stage at this timing, this driver
 693                  * should not disable the pipe. If such a case happens, this
 694                  * controller is not able to complete the status stage.
 695                  */
 696                 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
 697                         usbhs_pipe_disable(pipe);       /* disable pipe first */
 698         }
 699
 700         /*
 701          * Buffer clear if Zero-Length packet
 702          *
 703          * see
 704          * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
 705          */
 706         if (0 == rcv_len) {
 707                 pkt->zero = 1;
 708                 usbhsf_fifo_clear(pipe, fifo);
 709                 goto usbhs_fifo_read_end;
 710         }
 711
 712         /*
 713          * FIXME
 714          *
 715          * 32-bit access only
 716          */
 717         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 718                 ioread32_rep(addr, buf, len / 4);
 719                 len %= 4;
 720                 buf += total_len - len;
 721         }
 722
 723         /* the rest operation */
 724         for (i = 0; i < len; i++) {
 725                 if (!(i & 0x03))
 726                         data = ioread32(addr);
 727
 728                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
 729         }
 730
 731 usbhs_fifo_read_end:
 732         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 733                 usbhs_pipe_number(pipe),
 734                 pkt->length, pkt->actual, *is_done, pkt->zero);
 735
 736 usbhs_fifo_read_busy:
 737         usbhsf_fifo_unselect(pipe, fifo);
 738
 739         return ret;
 740 }
 741
 742 const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
 743         .prepare = usbhsf_prepare_pop,
 744         .try_run = usbhsf_pio_try_pop,
 745 };
 746
 747 /*
 748  *              DCP ctrol statge handler
 749  */
 750 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 751 {
 752         usbhs_dcp_control_transfer_done(pkt->pipe);
 753
 754         *is_done = 1;
 755
 756         return 0;
 757 }
 758
 759 const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
 760         .prepare = usbhsf_ctrl_stage_end,
 761         .try_run = usbhsf_ctrl_stage_end,
 762 };
 763
 764 /*
 765  *              DMA fifo functions
 766  */
 767 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 768                                             struct usbhs_pkt *pkt)
 769 {
 770         if (&usbhs_fifo_dma_push_handler == pkt->handler)
 771                 return fifo->tx_chan;
 772
 773         if (&usbhs_fifo_dma_pop_handler == pkt->handler)
 774                 return fifo->rx_chan;
 775
 776         return NULL;
 777 }
 778
 779 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
 780                                               struct usbhs_pkt *pkt)
 781 {
 782         struct usbhs_fifo *fifo;
 783         int i;
 784
 785         usbhs_for_each_dfifo(priv, fifo, i) {
 786                 if (usbhsf_dma_chan_get(fifo, pkt) &&
 787                     !usbhsf_fifo_is_busy(fifo))
 788                         return fifo;
 789         }
 790
 791         return NULL;
 792 }
 793
 794 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 795 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 796 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
 797                               struct usbhs_fifo *fifo,
 798                               u16 dreqe)
 799 {
 800         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 801
 802         usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 803 }
 804
 805 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 806 {
 807         struct usbhs_pipe *pipe = pkt->pipe;
 808         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 809         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 810         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 811         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 812
 813         return info->dma_map_ctrl(chan->device->dev, pkt, map);
 814 }
 815
 816 static void usbhsf_dma_complete(void *arg,
 817                                 const struct dmaengine_result *result);
 818 static void usbhsf_dma_xfer_preparing(struct usbhs_pkt *pkt)
 819 {
 820         struct usbhs_pipe *pipe = pkt->pipe;
 821         struct usbhs_fifo *fifo;
 822         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 823         struct dma_async_tx_descriptor *desc;
 824         struct dma_chan *chan;
 825         struct device *dev = usbhs_priv_to_dev(priv);
 826         enum dma_transfer_direction dir;
 827         dma_cookie_t cookie;
 828
 829         fifo = usbhs_pipe_to_fifo(pipe);
 830         if (!fifo)
 831                 return;
 832
 833         chan = usbhsf_dma_chan_get(fifo, pkt);
 834         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 835
 836         desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
 837                                         pkt->trans, dir,
 838                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 839         if (!desc)
 840                 return;
 841
 842         desc->callback_result   = usbhsf_dma_complete;
 843         desc->callback_param    = pkt;
 844
 845         cookie = dmaengine_submit(desc);
 846         if (cookie < 0) {
 847                 dev_err(dev, "Failed to submit dma descriptor\n");
 848                 return;
 849         }
 850
 851         dev_dbg(dev, "  %s %d (%d/ %d)\n",
 852                 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 853
 854         usbhs_pipe_running(pipe, 1);
 855         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 856         dma_async_issue_pending(chan);
 857         usbhsf_dma_start(pipe, fifo);
 858         usbhs_pipe_enable(pipe);
 859 }
 860
 861 static void xfer_work(struct work_struct *work)
 862 {
 863         struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
 864         struct usbhs_pipe *pipe = pkt->pipe;
 865         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 866         unsigned long flags;
 867
 868         usbhs_lock(priv, flags);
 869         usbhsf_dma_xfer_preparing(pkt);
 870         usbhs_unlock(priv, flags);
 871 }
 872
 873 /*
 874  *              DMA push handler
 875  */
 876 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 877 {
 878         struct usbhs_pipe *pipe = pkt->pipe;
 879         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 880         struct usbhs_fifo *fifo;
 881         int len = pkt->length - pkt->actual;
 882         int ret;
 883         uintptr_t align_mask;
 884
 885         if (usbhs_pipe_is_busy(pipe))
 886                 return 0;
 887
 888         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 889         if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
 890             usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
 891                 goto usbhsf_pio_prepare_push;
 892
 893         /* check data length if this driver don't use USB-DMAC */
 894         if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
 895                 goto usbhsf_pio_prepare_push;
 896
 897         /* check buffer alignment */
 898         align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
 899                                         USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
 900         if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
 901                 goto usbhsf_pio_prepare_push;
 902
 903         /* return at this time if the pipe is running */
 904         if (usbhs_pipe_is_running(pipe))
 905                 return 0;
 906
 907         /* get enable DMA fifo */
 908         fifo = usbhsf_get_dma_fifo(priv, pkt);
 909         if (!fifo)
 910                 goto usbhsf_pio_prepare_push;
 911
 912         ret = usbhsf_fifo_select(pipe, fifo, 0);
 913         if (ret < 0)
 914                 goto usbhsf_pio_prepare_push;
 915
 916         if (usbhsf_dma_map(pkt) < 0)
 917                 goto usbhsf_pio_prepare_push_unselect;
 918
 919         pkt->trans = len;
 920
 921         usbhsf_tx_irq_ctrl(pipe, 0);
 922         /* FIXME: Workaound for usb dmac that driver can be used in atomic */
 923         if (usbhs_get_dparam(priv, has_usb_dmac)) {
 924                 usbhsf_dma_xfer_preparing(pkt);
 925         } else {
 926                 INIT_WORK(&pkt->work, xfer_work);
 927                 schedule_work(&pkt->work);
 928         }
 929
 930         return 0;
 931
 932 usbhsf_pio_prepare_push_unselect:
 933         usbhsf_fifo_unselect(pipe, fifo);
 934 usbhsf_pio_prepare_push:
 935         /*
 936          * change handler to PIO
 937          */
 938         pkt->handler = &usbhs_fifo_pio_push_handler;
 939
 940         return pkt->handler->prepare(pkt, is_done);
 941 }
 942
 943 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 944 {
 945         struct usbhs_pipe *pipe = pkt->pipe;
 946         int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
 947
 948         pkt->actual += pkt->trans;
 949
 950         if (pkt->actual < pkt->length)
 951                 *is_done = 0;           /* there are remainder data */
 952         else if (is_short)
 953                 *is_done = 1;           /* short packet */
 954         else
 955                 *is_done = !pkt->zero;  /* send zero packet? */
 956
 957         usbhs_pipe_running(pipe, !*is_done);
 958
 959         usbhsf_dma_stop(pipe, pipe->fifo);
 960         usbhsf_dma_unmap(pkt);
 961         usbhsf_fifo_unselect(pipe, pipe->fifo);
 962
 963         if (!*is_done) {
 964                 /* change handler to PIO */
 965                 pkt->handler = &usbhs_fifo_pio_push_handler;
 966                 return pkt->handler->try_run(pkt, is_done);
 967         }
 968
 969         return 0;
 970 }
 971
 972 const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
 973         .prepare        = usbhsf_dma_prepare_push,
 974         .dma_done       = usbhsf_dma_push_done,
 975 };
 976
 977 /*
 978  *              DMA pop handler
 979  */
 980
 981 static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
 982                                               int *is_done)
 983 {
 984         return usbhsf_prepare_pop(pkt, is_done);
 985 }
 986
 987 static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
 988                                                 int *is_done)
 989 {
 990         struct usbhs_pipe *pipe = pkt->pipe;
 991         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 992         struct usbhs_fifo *fifo;
 993         int ret;
 994
 995         if (usbhs_pipe_is_busy(pipe))
 996                 return 0;
 997
 998         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 999         if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
1000             usbhs_pipe_type_is(pipe, USB_ENDPOINT_XFER_ISOC))
1001                 goto usbhsf_pio_prepare_pop;
1002
1003         fifo = usbhsf_get_dma_fifo(priv, pkt);
1004         if (!fifo)
1005                 goto usbhsf_pio_prepare_pop;
1006
1007         if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
1008                 goto usbhsf_pio_prepare_pop;
1009
1010         /* return at this time if the pipe is running */
1011         if (usbhs_pipe_is_running(pipe))
1012                 return 0;
1013
1014         usbhs_pipe_config_change_bfre(pipe, 1);
1015
1016         ret = usbhsf_fifo_select(pipe, fifo, 0);
1017         if (ret < 0)
1018                 goto usbhsf_pio_prepare_pop;
1019
1020         if (usbhsf_dma_map(pkt) < 0)
1021                 goto usbhsf_pio_prepare_pop_unselect;
1022
1023         /* DMA */
1024
1025         /*
1026          * usbhs_fifo_dma_pop_handler :: prepare
1027          * enabled irq to come here.
1028          * but it is no longer needed for DMA. disable it.
1029          */
1030         usbhsf_rx_irq_ctrl(pipe, 0);
1031
1032         pkt->trans = pkt->length;
1033
1034         usbhsf_dma_xfer_preparing(pkt);
1035
1036         return 0;
1037
1038 usbhsf_pio_prepare_pop_unselect:
1039         usbhsf_fifo_unselect(pipe, fifo);
1040 usbhsf_pio_prepare_pop:
1041
1042         /*
1043          * change handler to PIO
1044          */
1045         pkt->handler = &usbhs_fifo_pio_pop_handler;
1046         usbhs_pipe_config_change_bfre(pipe, 0);
1047
1048         return pkt->handler->prepare(pkt, is_done);
1049 }
1050
1051 static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1052 {
1053         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1054
1055         if (usbhs_get_dparam(priv, has_usb_dmac))
1056                 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1057         else
1058                 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1059 }
1060
1061 static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1062 {
1063         struct usbhs_pipe *pipe = pkt->pipe;
1064         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1065         struct usbhs_fifo *fifo;
1066         int len, ret;
1067
1068         if (usbhs_pipe_is_busy(pipe))
1069                 return 0;
1070
1071         if (usbhs_pipe_is_dcp(pipe))
1072                 goto usbhsf_pio_prepare_pop;
1073
1074         /* get enable DMA fifo */
1075         fifo = usbhsf_get_dma_fifo(priv, pkt);
1076         if (!fifo)
1077                 goto usbhsf_pio_prepare_pop;
1078
1079         if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1080                 goto usbhsf_pio_prepare_pop;
1081
1082         ret = usbhsf_fifo_select(pipe, fifo, 0);
1083         if (ret < 0)
1084                 goto usbhsf_pio_prepare_pop;
1085
1086         /* use PIO if packet is less than pio_dma_border */
1087         len = usbhsf_fifo_rcv_len(priv, fifo);
1088         len = min(pkt->length - pkt->actual, len);
1089         if (len & 0x7) /* 8byte alignment */
1090                 goto usbhsf_pio_prepare_pop_unselect;
1091
1092         if (len < usbhs_get_dparam(priv, pio_dma_border))
1093                 goto usbhsf_pio_prepare_pop_unselect;
1094
1095         ret = usbhsf_fifo_barrier(priv, fifo);
1096         if (ret < 0)
1097                 goto usbhsf_pio_prepare_pop_unselect;
1098
1099         if (usbhsf_dma_map(pkt) < 0)
1100                 goto usbhsf_pio_prepare_pop_unselect;
1101
1102         /* DMA */
1103
1104         /*
1105          * usbhs_fifo_dma_pop_handler :: prepare
1106          * enabled irq to come here.
1107          * but it is no longer needed for DMA. disable it.
1108          */
1109         usbhsf_rx_irq_ctrl(pipe, 0);
1110
1111         pkt->trans = len;
1112
1113         INIT_WORK(&pkt->work, xfer_work);
1114         schedule_work(&pkt->work);
1115
1116         return 0;
1117
1118 usbhsf_pio_prepare_pop_unselect:
1119         usbhsf_fifo_unselect(pipe, fifo);
1120 usbhsf_pio_prepare_pop:
1121
1122         /*
1123          * change handler to PIO
1124          */
1125         pkt->handler = &usbhs_fifo_pio_pop_handler;
1126
1127         return pkt->handler->try_run(pkt, is_done);
1128 }
1129
1130 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1131 {
1132         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1133
1134         BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1135
1136         return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1137 }
1138
1139 static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1140 {
1141         struct usbhs_pipe *pipe = pkt->pipe;
1142         int maxp = usbhs_pipe_get_maxpacket(pipe);
1143
1144         usbhsf_dma_stop(pipe, pipe->fifo);
1145         usbhsf_dma_unmap(pkt);
1146         usbhsf_fifo_unselect(pipe, pipe->fifo);
1147
1148         pkt->actual += pkt->trans;
1149
1150         if ((pkt->actual == pkt->length) ||     /* receive all data */
1151             (pkt->trans < maxp)) {              /* short packet */
1152                 *is_done = 1;
1153                 usbhs_pipe_running(pipe, 0);
1154         } else {
1155                 /* re-enable */
1156                 usbhs_pipe_running(pipe, 0);
1157                 usbhsf_prepare_pop(pkt, is_done);
1158         }
1159
1160         return 0;
1161 }
1162
1163 static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1164                                            struct dma_chan *chan, int dtln)
1165 {
1166         struct usbhs_pipe *pipe = pkt->pipe;
1167         size_t received_size;
1168         int maxp = usbhs_pipe_get_maxpacket(pipe);
1169
1170         received_size = pkt->length - pkt->dma_result->residue;
1171
1172         if (dtln) {
1173                 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1174                 received_size &= ~(maxp - 1);
1175                 received_size += dtln;
1176         }
1177
1178         return received_size;
1179 }
1180
1181 static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1182                                              int *is_done)
1183 {
1184         struct usbhs_pipe *pipe = pkt->pipe;
1185         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1186         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1187         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1188         int rcv_len;
1189
1190         /*
1191          * Since the driver disables rx_irq in DMA mode, the interrupt handler
1192          * cannot the BRDYSTS. So, the function clears it here because the
1193          * driver may use PIO mode next time.
1194          */
1195         usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1196
1197         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1198         usbhsf_fifo_clear(pipe, fifo);
1199         pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1200
1201         usbhs_pipe_running(pipe, 0);
1202         usbhsf_dma_stop(pipe, fifo);
1203         usbhsf_dma_unmap(pkt);
1204         usbhsf_fifo_unselect(pipe, pipe->fifo);
1205
1206         /* The driver can assume the rx transaction is always "done" */
1207         *is_done = 1;
1208
1209         return 0;
1210 }
1211
1212 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1213 {
1214         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1215
1216         if (usbhs_get_dparam(priv, has_usb_dmac))
1217                 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1218         else
1219                 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1220 }
1221
1222 const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1223         .prepare        = usbhsf_dma_prepare_pop,
1224         .try_run        = usbhsf_dma_try_pop,
1225         .dma_done       = usbhsf_dma_pop_done
1226 };
1227
1228 /*
1229  *              DMA setting
1230  */
1231 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1232 {
1233         struct sh_dmae_slave *slave = param;
1234
1235         /*
1236          * FIXME
1237          *
1238          * usbhs doesn't recognize id = 0 as valid DMA
1239          */
1240         if (0 == slave->shdma_slave.slave_id)
1241                 return false;
1242
1243         chan->private = slave;
1244
1245         return true;
1246 }
1247
1248 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1249 {
1250         if (fifo->tx_chan)
1251                 dma_release_channel(fifo->tx_chan);
1252         if (fifo->rx_chan)
1253                 dma_release_channel(fifo->rx_chan);
1254
1255         fifo->tx_chan = NULL;
1256         fifo->rx_chan = NULL;
1257 }
1258
1259 static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1260 {
1261         dma_cap_mask_t mask;
1262
1263         dma_cap_zero(mask);
1264         dma_cap_set(DMA_SLAVE, mask);
1265         fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1266                                             &fifo->tx_slave);
1267
1268         dma_cap_zero(mask);
1269         dma_cap_set(DMA_SLAVE, mask);
1270         fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1271                                             &fifo->rx_slave);
1272 }
1273
1274 static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1275                                int channel)
1276 {
1277         char name[16];
1278
1279         /*
1280          * To avoid complex handing for DnFIFOs, the driver uses each
1281          * DnFIFO as TX or RX direction (not bi-direction).
1282          * So, the driver uses odd channels for TX, even channels for RX.
1283          */
1284         snprintf(name, sizeof(name), "ch%d", channel);
1285         if (channel & 1) {
1286                 fifo->tx_chan = dma_request_chan(dev, name);
1287                 if (IS_ERR(fifo->tx_chan))
1288                         fifo->tx_chan = NULL;
1289         } else {
1290                 fifo->rx_chan = dma_request_chan(dev, name);
1291                 if (IS_ERR(fifo->rx_chan))
1292                         fifo->rx_chan = NULL;
1293         }
1294 }
1295
1296 static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1297                             int channel)
1298 {
1299         struct device *dev = usbhs_priv_to_dev(priv);
1300
1301         if (dev_of_node(dev))
1302                 usbhsf_dma_init_dt(dev, fifo, channel);
1303         else
1304                 usbhsf_dma_init_pdev(fifo);
1305
1306         if (fifo->tx_chan || fifo->rx_chan)
1307                 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1308                          fifo->name,
1309                          fifo->tx_chan ? "[TX]" : "    ",
1310                          fifo->rx_chan ? "[RX]" : "    ");
1311 }
1312
1313 /*
1314  *              irq functions
1315  */
1316 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1317                             struct usbhs_irq_state *irq_state)
1318 {
1319         struct usbhs_pipe *pipe;
1320         struct device *dev = usbhs_priv_to_dev(priv);
1321         int i, ret;
1322
1323         if (!irq_state->bempsts) {
1324                 dev_err(dev, "debug %s !!\n", __func__);
1325                 return -EIO;
1326         }
1327
1328         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1329
1330         /*
1331          * search interrupted "pipe"
1332          * not "uep".
1333          */
1334         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1335                 if (!(irq_state->bempsts & (1 << i)))
1336                         continue;
1337
1338                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1339                 if (ret < 0)
1340                         dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1341         }
1342
1343         return 0;
1344 }
1345
1346 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1347                             struct usbhs_irq_state *irq_state)
1348 {
1349         struct usbhs_pipe *pipe;
1350         struct device *dev = usbhs_priv_to_dev(priv);
1351         int i, ret;
1352
1353         if (!irq_state->brdysts) {
1354                 dev_err(dev, "debug %s !!\n", __func__);
1355                 return -EIO;
1356         }
1357
1358         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1359
1360         /*
1361          * search interrupted "pipe"
1362          * not "uep".
1363          */
1364         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1365                 if (!(irq_state->brdysts & (1 << i)))
1366                         continue;
1367
1368                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1369                 if (ret < 0)
1370                         dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1371         }
1372
1373         return 0;
1374 }
1375
1376 static void usbhsf_dma_complete(void *arg,
1377                                 const struct dmaengine_result *result)
1378 {
1379         struct usbhs_pkt *pkt = arg;
1380         struct usbhs_pipe *pipe = pkt->pipe;
1381         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1382         struct device *dev = usbhs_priv_to_dev(priv);
1383         int ret;
1384
1385         pkt->dma_result = result;
1386         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1387         if (ret < 0)
1388                 dev_err(dev, "dma_complete run_error %d : %d\n",
1389                         usbhs_pipe_number(pipe), ret);
1390 }
1391
1392 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1393 {
1394         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1395         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1396
1397         /* clear DCP FIFO of transmission */
1398         if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1399                 return;
1400         usbhsf_fifo_clear(pipe, fifo);
1401         usbhsf_fifo_unselect(pipe, fifo);
1402
1403         /* clear DCP FIFO of reception */
1404         if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1405                 return;
1406         usbhsf_fifo_clear(pipe, fifo);
1407         usbhsf_fifo_unselect(pipe, fifo);
1408 }
1409
1410 /*
1411  *              fifo init
1412  */
1413 void usbhs_fifo_init(struct usbhs_priv *priv)
1414 {
1415         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1416         struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1417         struct usbhs_fifo *dfifo;
1418         int i;
1419
1420         mod->irq_empty          = usbhsf_irq_empty;
1421         mod->irq_ready          = usbhsf_irq_ready;
1422         mod->irq_bempsts        = 0;
1423         mod->irq_brdysts        = 0;
1424
1425         cfifo->pipe     = NULL;
1426         usbhs_for_each_dfifo(priv, dfifo, i)
1427                 dfifo->pipe     = NULL;
1428 }
1429
1430 void usbhs_fifo_quit(struct usbhs_priv *priv)
1431 {
1432         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1433
1434         mod->irq_empty          = NULL;
1435         mod->irq_ready          = NULL;
1436         mod->irq_bempsts        = 0;
1437         mod->irq_brdysts        = 0;
1438 }
1439
1440 #define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port)              \
1441 do {                                                                    \
1442         fifo = usbhsf_get_dnfifo(priv, channel);                        \
1443         fifo->name      = "D"#channel"FIFO";                            \
1444         fifo->port      = fifo_port;                                    \
1445         fifo->sel       = D##channel##FIFOSEL;                          \
1446         fifo->ctr       = D##channel##FIFOCTR;                          \
1447         fifo->tx_slave.shdma_slave.slave_id =                           \
1448                         usbhs_get_dparam(priv, d##channel##_tx_id);     \
1449         fifo->rx_slave.shdma_slave.slave_id =                           \
1450                         usbhs_get_dparam(priv, d##channel##_rx_id);     \
1451         usbhsf_dma_init(priv, fifo, channel);                           \
1452 } while (0)
1453
1454 #define USBHS_DFIFO_INIT(priv, fifo, channel)                           \
1455                 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1456 #define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel)                   \
1457                 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1458
1459 int usbhs_fifo_probe(struct usbhs_priv *priv)
1460 {
1461         struct usbhs_fifo *fifo;
1462
1463         /* CFIFO */
1464         fifo = usbhsf_get_cfifo(priv);
1465         fifo->name      = "CFIFO";
1466         fifo->port      = CFIFO;
1467         fifo->sel       = CFIFOSEL;
1468         fifo->ctr       = CFIFOCTR;
1469
1470         /* DFIFO */
1471         USBHS_DFIFO_INIT(priv, fifo, 0);
1472         USBHS_DFIFO_INIT(priv, fifo, 1);
1473         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1474         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1475
1476         return 0;
1477 }
1478
1479 void usbhs_fifo_remove(struct usbhs_priv *priv)
1480 {
1481         struct usbhs_fifo *fifo;
1482         int i;
1483
1484         usbhs_for_each_dfifo(priv, fifo, i)
1485                 usbhsf_dma_quit(priv, fifo);
1486 }