drivers/usb/renesas_usbhs/fifo.c

   1 /*
   2  * Renesas USB driver
   3  *
   4  * Copyright (C) 2011 Renesas Solutions Corp.
   5  * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  15  *
  16  */
  17 #include <linux/delay.h>
  18 #include <linux/io.h>
  19 #include <linux/scatterlist.h>
  20 #include "common.h"
  21 #include "pipe.h"
  22
  23 #define usbhsf_get_cfifo(p)     (&((p)->fifo_info.cfifo))
  24 #define usbhsf_is_cfifo(p, f)   (usbhsf_get_cfifo(p) == f)
  25
  26 #define usbhsf_fifo_is_busy(f)  ((f)->pipe) /* see usbhs_pipe_select_fifo */
  27
  28 /*
  29  *              packet initialize
  30  */
  31 void usbhs_pkt_init(struct usbhs_pkt *pkt)
  32 {
  33         INIT_LIST_HEAD(&pkt->node);
  34 }
  35
  36 /*
  37  *              packet control function
  38  */
  39 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
  40 {
  41         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
  42         struct device *dev = usbhs_priv_to_dev(priv);
  43
  44         dev_err(dev, "null handler\n");
  45
  46         return -EINVAL;
  47 }
  48
  49 static const struct usbhs_pkt_handle usbhsf_null_handler = {
  50         .prepare = usbhsf_null_handle,
  51         .try_run = usbhsf_null_handle,
  52 };
  53
  54 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
  55                     void (*done)(struct usbhs_priv *priv,
  56                                  struct usbhs_pkt *pkt),
  57                     void *buf, int len, int zero, int sequence)
  58 {
  59         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
  60         struct device *dev = usbhs_priv_to_dev(priv);
  61         unsigned long flags;
  62
  63         if (!done) {
  64                 dev_err(dev, "no done function\n");
  65                 return;
  66         }
  67
  68         /********************  spin lock ********************/
  69         usbhs_lock(priv, flags);
  70
  71         if (!pipe->handler) {
  72                 dev_err(dev, "no handler function\n");
  73                 pipe->handler = &usbhsf_null_handler;
  74         }
  75
  76         list_move_tail(&pkt->node, &pipe->list);
  77
  78         /*
  79          * each pkt must hold own handler.
  80          * because handler might be changed by its situation.
  81          * dma handler -> pio handler.
  82          */
  83         pkt->pipe       = pipe;
  84         pkt->buf        = buf;
  85         pkt->handler    = pipe->handler;
  86         pkt->length     = len;
  87         pkt->zero       = zero;
  88         pkt->actual     = 0;
  89         pkt->done       = done;
  90         pkt->sequence   = sequence;
  91
  92         usbhs_unlock(priv, flags);
  93         /********************  spin unlock ******************/
  94 }
  95
  96 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
  97 {
  98         list_del_init(&pkt->node);
  99 }
 100
 101 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
 102 {
 103         if (list_empty(&pipe->list))
 104                 return NULL;
 105
 106         return list_first_entry(&pipe->list, struct usbhs_pkt, node);
 107 }
 108
 109 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
 110                               struct usbhs_fifo *fifo);
 111 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
 112                                  struct usbhs_fifo *fifo);
 113 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 114                                             struct usbhs_pkt *pkt);
 115 #define usbhsf_dma_map(p)       __usbhsf_dma_map_ctrl(p, 1)
 116 #define usbhsf_dma_unmap(p)     __usbhsf_dma_map_ctrl(p, 0)
 117 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map);
 118 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
 119 {
 120         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 121         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 122         unsigned long flags;
 123
 124         /********************  spin lock ********************/
 125         usbhs_lock(priv, flags);
 126
 127         usbhs_pipe_disable(pipe);
 128
 129         if (!pkt)
 130                 pkt = __usbhsf_pkt_get(pipe);
 131
 132         if (pkt) {
 133                 struct dma_chan *chan = NULL;
 134
 135                 if (fifo)
 136                         chan = usbhsf_dma_chan_get(fifo, pkt);
 137                 if (chan) {
 138                         dmaengine_terminate_all(chan);
 139                         usbhsf_fifo_clear(pipe, fifo);
 140                         usbhsf_dma_unmap(pkt);
 141                 }
 142
 143                 __usbhsf_pkt_del(pkt);
 144         }
 145
 146         if (fifo)
 147                 usbhsf_fifo_unselect(pipe, fifo);
 148
 149         usbhs_unlock(priv, flags);
 150         /********************  spin unlock ******************/
 151
 152         return pkt;
 153 }
 154
 155 enum {
 156         USBHSF_PKT_PREPARE,
 157         USBHSF_PKT_TRY_RUN,
 158         USBHSF_PKT_DMA_DONE,
 159 };
 160
 161 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
 162 {
 163         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 164         struct usbhs_pkt *pkt;
 165         struct device *dev = usbhs_priv_to_dev(priv);
 166         int (*func)(struct usbhs_pkt *pkt, int *is_done);
 167         unsigned long flags;
 168         int ret = 0;
 169         int is_done = 0;
 170
 171         /********************  spin lock ********************/
 172         usbhs_lock(priv, flags);
 173
 174         pkt = __usbhsf_pkt_get(pipe);
 175         if (!pkt)
 176                 goto __usbhs_pkt_handler_end;
 177
 178         switch (type) {
 179         case USBHSF_PKT_PREPARE:
 180                 func = pkt->handler->prepare;
 181                 break;
 182         case USBHSF_PKT_TRY_RUN:
 183                 func = pkt->handler->try_run;
 184                 break;
 185         case USBHSF_PKT_DMA_DONE:
 186                 func = pkt->handler->dma_done;
 187                 break;
 188         default:
 189                 dev_err(dev, "unknown pkt handler\n");
 190                 goto __usbhs_pkt_handler_end;
 191         }
 192
 193         if (likely(func))
 194                 ret = func(pkt, &is_done);
 195
 196         if (is_done)
 197                 __usbhsf_pkt_del(pkt);
 198
 199 __usbhs_pkt_handler_end:
 200         usbhs_unlock(priv, flags);
 201         /********************  spin unlock ******************/
 202
 203         if (is_done) {
 204                 pkt->done(priv, pkt);
 205                 usbhs_pkt_start(pipe);
 206         }
 207
 208         return ret;
 209 }
 210
 211 void usbhs_pkt_start(struct usbhs_pipe *pipe)
 212 {
 213         usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
 214 }
 215
 216 /*
 217  *              irq enable/disable function
 218  */
 219 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
 220 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
 221 #define usbhsf_irq_callback_ctrl(pipe, status, enable)                  \
 222         ({                                                              \
 223                 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);     \
 224                 struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
 225                 u16 status = (1 << usbhs_pipe_number(pipe));            \
 226                 if (!mod)                                               \
 227                         return;                                         \
 228                 if (enable)                                             \
 229                         mod->status |= status;                          \
 230                 else                                                    \
 231                         mod->status &= ~status;                         \
 232                 usbhs_irq_callback_update(priv, mod);                   \
 233         })
 234
 235 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 236 {
 237         /*
 238          * And DCP pipe can NOT use "ready interrupt" for "send"
 239          * it should use "empty" interrupt.
 240          * see
 241          *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
 242          *
 243          * on the other hand, normal pipe can use "ready interrupt" for "send"
 244          * even though it is single/double buffer
 245          */
 246         if (usbhs_pipe_is_dcp(pipe))
 247                 usbhsf_irq_empty_ctrl(pipe, enable);
 248         else
 249                 usbhsf_irq_ready_ctrl(pipe, enable);
 250 }
 251
 252 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 253 {
 254         usbhsf_irq_ready_ctrl(pipe, enable);
 255 }
 256
 257 /*
 258  *              FIFO ctrl
 259  */
 260 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
 261                                    struct usbhs_fifo *fifo)
 262 {
 263         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 264
 265         usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
 266 }
 267
 268 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
 269                                struct usbhs_fifo *fifo)
 270 {
 271         int timeout = 1024;
 272
 273         do {
 274                 /* The FIFO port is accessible */
 275                 if (usbhs_read(priv, fifo->ctr) & FRDY)
 276                         return 0;
 277
 278                 udelay(10);
 279         } while (timeout--);
 280
 281         return -EBUSY;
 282 }
 283
 284 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
 285                               struct usbhs_fifo *fifo)
 286 {
 287         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 288
 289         if (!usbhs_pipe_is_dcp(pipe))
 290                 usbhsf_fifo_barrier(priv, fifo);
 291
 292         usbhs_write(priv, fifo->ctr, BCLR);
 293 }
 294
 295 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
 296                                struct usbhs_fifo *fifo)
 297 {
 298         return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
 299 }
 300
 301 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
 302                                  struct usbhs_fifo *fifo)
 303 {
 304         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 305
 306         usbhs_pipe_select_fifo(pipe, NULL);
 307         usbhs_write(priv, fifo->sel, 0);
 308 }
 309
 310 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
 311                               struct usbhs_fifo *fifo,
 312                               int write)
 313 {
 314         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 315         struct device *dev = usbhs_priv_to_dev(priv);
 316         int timeout = 1024;
 317         u16 mask = ((1 << 5) | 0xF);            /* mask of ISEL | CURPIPE */
 318         u16 base = usbhs_pipe_number(pipe);     /* CURPIPE */
 319
 320         if (usbhs_pipe_is_busy(pipe) ||
 321             usbhsf_fifo_is_busy(fifo))
 322                 return -EBUSY;
 323
 324         if (usbhs_pipe_is_dcp(pipe)) {
 325                 base |= (1 == write) << 5;      /* ISEL */
 326
 327                 if (usbhs_mod_is_host(priv))
 328                         usbhs_dcp_dir_for_host(pipe, write);
 329         }
 330
 331         /* "base" will be used below  */
 332         if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
 333                 usbhs_write(priv, fifo->sel, base);
 334         else
 335                 usbhs_write(priv, fifo->sel, base | MBW_32);
 336
 337         /* check ISEL and CURPIPE value */
 338         while (timeout--) {
 339                 if (base == (mask & usbhs_read(priv, fifo->sel))) {
 340                         usbhs_pipe_select_fifo(pipe, fifo);
 341                         return 0;
 342                 }
 343                 udelay(10);
 344         }
 345
 346         dev_err(dev, "fifo select error\n");
 347
 348         return -EIO;
 349 }
 350
 351 /*
 352  *              DCP status stage
 353  */
 354 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
 355 {
 356         struct usbhs_pipe *pipe = pkt->pipe;
 357         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 358         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 359         struct device *dev = usbhs_priv_to_dev(priv);
 360         int ret;
 361
 362         usbhs_pipe_disable(pipe);
 363
 364         ret = usbhsf_fifo_select(pipe, fifo, 1);
 365         if (ret < 0) {
 366                 dev_err(dev, "%s() faile\n", __func__);
 367                 return ret;
 368         }
 369
 370         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 371
 372         usbhsf_fifo_clear(pipe, fifo);
 373         usbhsf_send_terminator(pipe, fifo);
 374
 375         usbhsf_fifo_unselect(pipe, fifo);
 376
 377         usbhsf_tx_irq_ctrl(pipe, 1);
 378         usbhs_pipe_enable(pipe);
 379
 380         return ret;
 381 }
 382
 383 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
 384 {
 385         struct usbhs_pipe *pipe = pkt->pipe;
 386         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 387         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 388         struct device *dev = usbhs_priv_to_dev(priv);
 389         int ret;
 390
 391         usbhs_pipe_disable(pipe);
 392
 393         ret = usbhsf_fifo_select(pipe, fifo, 0);
 394         if (ret < 0) {
 395                 dev_err(dev, "%s() fail\n", __func__);
 396                 return ret;
 397         }
 398
 399         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 400         usbhsf_fifo_clear(pipe, fifo);
 401
 402         usbhsf_fifo_unselect(pipe, fifo);
 403
 404         usbhsf_rx_irq_ctrl(pipe, 1);
 405         usbhs_pipe_enable(pipe);
 406
 407         return ret;
 408
 409 }
 410
 411 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
 412 {
 413         struct usbhs_pipe *pipe = pkt->pipe;
 414
 415         if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
 416                 usbhsf_tx_irq_ctrl(pipe, 0);
 417         else
 418                 usbhsf_rx_irq_ctrl(pipe, 0);
 419
 420         pkt->actual = pkt->length;
 421         *is_done = 1;
 422
 423         return 0;
 424 }
 425
 426 const struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
 427         .prepare = usbhs_dcp_dir_switch_to_write,
 428         .try_run = usbhs_dcp_dir_switch_done,
 429 };
 430
 431 const struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
 432         .prepare = usbhs_dcp_dir_switch_to_read,
 433         .try_run = usbhs_dcp_dir_switch_done,
 434 };
 435
 436 /*
 437  *              DCP data stage (push)
 438  */
 439 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
 440 {
 441         struct usbhs_pipe *pipe = pkt->pipe;
 442
 443         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 444
 445         /*
 446          * change handler to PIO push
 447          */
 448         pkt->handler = &usbhs_fifo_pio_push_handler;
 449
 450         return pkt->handler->prepare(pkt, is_done);
 451 }
 452
 453 const struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
 454         .prepare = usbhsf_dcp_data_stage_try_push,
 455 };
 456
 457 /*
 458  *              DCP data stage (pop)
 459  */
 460 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
 461                                              int *is_done)
 462 {
 463         struct usbhs_pipe *pipe = pkt->pipe;
 464         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 465         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 466
 467         if (usbhs_pipe_is_busy(pipe))
 468                 return 0;
 469
 470         /*
 471          * prepare pop for DCP should
 472          *  - change DCP direction,
 473          *  - clear fifo
 474          *  - DATA1
 475          */
 476         usbhs_pipe_disable(pipe);
 477
 478         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 479
 480         usbhsf_fifo_select(pipe, fifo, 0);
 481         usbhsf_fifo_clear(pipe, fifo);
 482         usbhsf_fifo_unselect(pipe, fifo);
 483
 484         /*
 485          * change handler to PIO pop
 486          */
 487         pkt->handler = &usbhs_fifo_pio_pop_handler;
 488
 489         return pkt->handler->prepare(pkt, is_done);
 490 }
 491
 492 const struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
 493         .prepare = usbhsf_dcp_data_stage_prepare_pop,
 494 };
 495
 496 /*
 497  *              PIO push handler
 498  */
 499 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 500 {
 501         struct usbhs_pipe *pipe = pkt->pipe;
 502         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 503         struct device *dev = usbhs_priv_to_dev(priv);
 504         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 505         void __iomem *addr = priv->base + fifo->port;
 506         u8 *buf;
 507         int maxp = usbhs_pipe_get_maxpacket(pipe);
 508         int total_len;
 509         int i, ret, len;
 510         int is_short;
 511
 512         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 513         pkt->sequence = -1; /* -1 sequence will be ignored */
 514
 515         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 516
 517         ret = usbhsf_fifo_select(pipe, fifo, 1);
 518         if (ret < 0)
 519                 return 0;
 520
 521         ret = usbhs_pipe_is_accessible(pipe);
 522         if (ret < 0) {
 523                 /* inaccessible pipe is not an error */
 524                 ret = 0;
 525                 goto usbhs_fifo_write_busy;
 526         }
 527
 528         ret = usbhsf_fifo_barrier(priv, fifo);
 529         if (ret < 0)
 530                 goto usbhs_fifo_write_busy;
 531
 532         buf             = pkt->buf    + pkt->actual;
 533         len             = pkt->length - pkt->actual;
 534         len             = min(len, maxp);
 535         total_len       = len;
 536         is_short        = total_len < maxp;
 537
 538         /*
 539          * FIXME
 540          *
 541          * 32-bit access only
 542          */
 543         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 544                 iowrite32_rep(addr, buf, len / 4);
 545                 len %= 4;
 546                 buf += total_len - len;
 547         }
 548
 549         /* the rest operation */
 550         for (i = 0; i < len; i++)
 551                 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
 552
 553         /*
 554          * variable update
 555          */
 556         pkt->actual += total_len;
 557
 558         if (pkt->actual < pkt->length)
 559                 *is_done = 0;           /* there are remainder data */
 560         else if (is_short)
 561                 *is_done = 1;           /* short packet */
 562         else
 563                 *is_done = !pkt->zero;  /* send zero packet ? */
 564
 565         /*
 566          * pipe/irq handling
 567          */
 568         if (is_short)
 569                 usbhsf_send_terminator(pipe, fifo);
 570
 571         usbhsf_tx_irq_ctrl(pipe, !*is_done);
 572         usbhs_pipe_running(pipe, !*is_done);
 573         usbhs_pipe_enable(pipe);
 574
 575         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 576                 usbhs_pipe_number(pipe),
 577                 pkt->length, pkt->actual, *is_done, pkt->zero);
 578
 579         usbhsf_fifo_unselect(pipe, fifo);
 580
 581         return 0;
 582
 583 usbhs_fifo_write_busy:
 584         usbhsf_fifo_unselect(pipe, fifo);
 585
 586         /*
 587          * pipe is busy.
 588          * retry in interrupt
 589          */
 590         usbhsf_tx_irq_ctrl(pipe, 1);
 591         usbhs_pipe_running(pipe, 1);
 592
 593         return ret;
 594 }
 595
 596 static int usbhsf_pio_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 597 {
 598         if (usbhs_pipe_is_running(pkt->pipe))
 599                 return 0;
 600
 601         return usbhsf_pio_try_push(pkt, is_done);
 602 }
 603
 604 const struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
 605         .prepare = usbhsf_pio_prepare_push,
 606         .try_run = usbhsf_pio_try_push,
 607 };
 608
 609 /*
 610  *              PIO pop handler
 611  */
 612 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 613 {
 614         struct usbhs_pipe *pipe = pkt->pipe;
 615         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 616         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 617
 618         if (usbhs_pipe_is_busy(pipe))
 619                 return 0;
 620
 621         if (usbhs_pipe_is_running(pipe))
 622                 return 0;
 623
 624         /*
 625          * pipe enable to prepare packet receive
 626          */
 627         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 628         pkt->sequence = -1; /* -1 sequence will be ignored */
 629
 630         if (usbhs_pipe_is_dcp(pipe))
 631                 usbhsf_fifo_clear(pipe, fifo);
 632
 633         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 634         usbhs_pipe_enable(pipe);
 635         usbhs_pipe_running(pipe, 1);
 636         usbhsf_rx_irq_ctrl(pipe, 1);
 637
 638         return 0;
 639 }
 640
 641 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 642 {
 643         struct usbhs_pipe *pipe = pkt->pipe;
 644         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 645         struct device *dev = usbhs_priv_to_dev(priv);
 646         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 647         void __iomem *addr = priv->base + fifo->port;
 648         u8 *buf;
 649         u32 data = 0;
 650         int maxp = usbhs_pipe_get_maxpacket(pipe);
 651         int rcv_len, len;
 652         int i, ret;
 653         int total_len = 0;
 654
 655         ret = usbhsf_fifo_select(pipe, fifo, 0);
 656         if (ret < 0)
 657                 return 0;
 658
 659         ret = usbhsf_fifo_barrier(priv, fifo);
 660         if (ret < 0)
 661                 goto usbhs_fifo_read_busy;
 662
 663         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 664
 665         buf             = pkt->buf    + pkt->actual;
 666         len             = pkt->length - pkt->actual;
 667         len             = min(len, rcv_len);
 668         total_len       = len;
 669
 670         /*
 671          * update actual length first here to decide disable pipe.
 672          * if this pipe keeps BUF status and all data were popped,
 673          * then, next interrupt/token will be issued again
 674          */
 675         pkt->actual += total_len;
 676
 677         if ((pkt->actual == pkt->length) ||     /* receive all data */
 678             (total_len < maxp)) {               /* short packet */
 679                 *is_done = 1;
 680                 usbhsf_rx_irq_ctrl(pipe, 0);
 681                 usbhs_pipe_running(pipe, 0);
 682                 /*
 683                  * If function mode, since this controller is possible to enter
 684                  * Control Write status stage at this timing, this driver
 685                  * should not disable the pipe. If such a case happens, this
 686                  * controller is not able to complete the status stage.
 687                  */
 688                 if (!usbhs_mod_is_host(priv) && !usbhs_pipe_is_dcp(pipe))
 689                         usbhs_pipe_disable(pipe);       /* disable pipe first */
 690         }
 691
 692         /*
 693          * Buffer clear if Zero-Length packet
 694          *
 695          * see
 696          * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
 697          */
 698         if (0 == rcv_len) {
 699                 pkt->zero = 1;
 700                 usbhsf_fifo_clear(pipe, fifo);
 701                 goto usbhs_fifo_read_end;
 702         }
 703
 704         /*
 705          * FIXME
 706          *
 707          * 32-bit access only
 708          */
 709         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 710                 ioread32_rep(addr, buf, len / 4);
 711                 len %= 4;
 712                 buf += total_len - len;
 713         }
 714
 715         /* the rest operation */
 716         for (i = 0; i < len; i++) {
 717                 if (!(i & 0x03))
 718                         data = ioread32(addr);
 719
 720                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
 721         }
 722
 723 usbhs_fifo_read_end:
 724         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 725                 usbhs_pipe_number(pipe),
 726                 pkt->length, pkt->actual, *is_done, pkt->zero);
 727
 728 usbhs_fifo_read_busy:
 729         usbhsf_fifo_unselect(pipe, fifo);
 730
 731         return ret;
 732 }
 733
 734 const struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
 735         .prepare = usbhsf_prepare_pop,
 736         .try_run = usbhsf_pio_try_pop,
 737 };
 738
 739 /*
 740  *              DCP ctrol statge handler
 741  */
 742 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 743 {
 744         usbhs_dcp_control_transfer_done(pkt->pipe);
 745
 746         *is_done = 1;
 747
 748         return 0;
 749 }
 750
 751 const struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
 752         .prepare = usbhsf_ctrl_stage_end,
 753         .try_run = usbhsf_ctrl_stage_end,
 754 };
 755
 756 /*
 757  *              DMA fifo functions
 758  */
 759 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 760                                             struct usbhs_pkt *pkt)
 761 {
 762         if (&usbhs_fifo_dma_push_handler == pkt->handler)
 763                 return fifo->tx_chan;
 764
 765         if (&usbhs_fifo_dma_pop_handler == pkt->handler)
 766                 return fifo->rx_chan;
 767
 768         return NULL;
 769 }
 770
 771 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
 772                                               struct usbhs_pkt *pkt)
 773 {
 774         struct usbhs_fifo *fifo;
 775         int i;
 776
 777         usbhs_for_each_dfifo(priv, fifo, i) {
 778                 if (usbhsf_dma_chan_get(fifo, pkt) &&
 779                     !usbhsf_fifo_is_busy(fifo))
 780                         return fifo;
 781         }
 782
 783         return NULL;
 784 }
 785
 786 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 787 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 788 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
 789                               struct usbhs_fifo *fifo,
 790                               u16 dreqe)
 791 {
 792         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 793
 794         usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 795 }
 796
 797 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 798 {
 799         struct usbhs_pipe *pipe = pkt->pipe;
 800         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 801         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 802
 803         return info->dma_map_ctrl(pkt, map);
 804 }
 805
 806 static void usbhsf_dma_complete(void *arg);
 807 static void xfer_work(struct work_struct *work)
 808 {
 809         struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
 810         struct usbhs_pipe *pipe = pkt->pipe;
 811         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 812         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 813         struct dma_async_tx_descriptor *desc;
 814         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 815         struct device *dev = usbhs_priv_to_dev(priv);
 816         enum dma_transfer_direction dir;
 817
 818         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 819
 820         desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
 821                                         pkt->trans, dir,
 822                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 823         if (!desc)
 824                 return;
 825
 826         desc->callback          = usbhsf_dma_complete;
 827         desc->callback_param    = pipe;
 828
 829         pkt->cookie = dmaengine_submit(desc);
 830         if (pkt->cookie < 0) {
 831                 dev_err(dev, "Failed to submit dma descriptor\n");
 832                 return;
 833         }
 834
 835         dev_dbg(dev, "  %s %d (%d/ %d)\n",
 836                 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 837
 838         usbhs_pipe_running(pipe, 1);
 839         usbhsf_dma_start(pipe, fifo);
 840         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 841         dma_async_issue_pending(chan);
 842         usbhs_pipe_enable(pipe);
 843 }
 844
 845 /*
 846  *              DMA push handler
 847  */
 848 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 849 {
 850         struct usbhs_pipe *pipe = pkt->pipe;
 851         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 852         struct usbhs_fifo *fifo;
 853         int len = pkt->length - pkt->actual;
 854         int ret;
 855         uintptr_t align_mask;
 856
 857         if (usbhs_pipe_is_busy(pipe))
 858                 return 0;
 859
 860         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 861         if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
 862             usbhs_pipe_is_dcp(pipe))
 863                 goto usbhsf_pio_prepare_push;
 864
 865         /* check data length if this driver don't use USB-DMAC */
 866         if (!usbhs_get_dparam(priv, has_usb_dmac) && len & 0x7)
 867                 goto usbhsf_pio_prepare_push;
 868
 869         /* check buffer alignment */
 870         align_mask = usbhs_get_dparam(priv, has_usb_dmac) ?
 871                                         USBHS_USB_DMAC_XFER_SIZE - 1 : 0x7;
 872         if ((uintptr_t)(pkt->buf + pkt->actual) & align_mask)
 873                 goto usbhsf_pio_prepare_push;
 874
 875         /* return at this time if the pipe is running */
 876         if (usbhs_pipe_is_running(pipe))
 877                 return 0;
 878
 879         /* get enable DMA fifo */
 880         fifo = usbhsf_get_dma_fifo(priv, pkt);
 881         if (!fifo)
 882                 goto usbhsf_pio_prepare_push;
 883
 884         if (usbhsf_dma_map(pkt) < 0)
 885                 goto usbhsf_pio_prepare_push;
 886
 887         ret = usbhsf_fifo_select(pipe, fifo, 0);
 888         if (ret < 0)
 889                 goto usbhsf_pio_prepare_push_unmap;
 890
 891         pkt->trans = len;
 892
 893         usbhsf_tx_irq_ctrl(pipe, 0);
 894         INIT_WORK(&pkt->work, xfer_work);
 895         schedule_work(&pkt->work);
 896
 897         return 0;
 898
 899 usbhsf_pio_prepare_push_unmap:
 900         usbhsf_dma_unmap(pkt);
 901 usbhsf_pio_prepare_push:
 902         /*
 903          * change handler to PIO
 904          */
 905         pkt->handler = &usbhs_fifo_pio_push_handler;
 906
 907         return pkt->handler->prepare(pkt, is_done);
 908 }
 909
 910 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 911 {
 912         struct usbhs_pipe *pipe = pkt->pipe;
 913         int is_short = pkt->trans % usbhs_pipe_get_maxpacket(pipe);
 914
 915         pkt->actual += pkt->trans;
 916
 917         if (pkt->actual < pkt->length)
 918                 *is_done = 0;           /* there are remainder data */
 919         else if (is_short)
 920                 *is_done = 1;           /* short packet */
 921         else
 922                 *is_done = !pkt->zero;  /* send zero packet? */
 923
 924         usbhs_pipe_running(pipe, !*is_done);
 925
 926         usbhsf_dma_stop(pipe, pipe->fifo);
 927         usbhsf_dma_unmap(pkt);
 928         usbhsf_fifo_unselect(pipe, pipe->fifo);
 929
 930         if (!*is_done) {
 931                 /* change handler to PIO */
 932                 pkt->handler = &usbhs_fifo_pio_push_handler;
 933                 return pkt->handler->try_run(pkt, is_done);
 934         }
 935
 936         return 0;
 937 }
 938
 939 const struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
 940         .prepare        = usbhsf_dma_prepare_push,
 941         .dma_done       = usbhsf_dma_push_done,
 942 };
 943
 944 /*
 945  *              DMA pop handler
 946  */
 947
 948 static int usbhsf_dma_prepare_pop_with_rx_irq(struct usbhs_pkt *pkt,
 949                                               int *is_done)
 950 {
 951         return usbhsf_prepare_pop(pkt, is_done);
 952 }
 953
 954 static int usbhsf_dma_prepare_pop_with_usb_dmac(struct usbhs_pkt *pkt,
 955                                                 int *is_done)
 956 {
 957         struct usbhs_pipe *pipe = pkt->pipe;
 958         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 959         struct usbhs_fifo *fifo;
 960         int ret;
 961
 962         if (usbhs_pipe_is_busy(pipe))
 963                 return 0;
 964
 965         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 966         if ((pkt->length < usbhs_get_dparam(priv, pio_dma_border)) ||
 967             usbhs_pipe_is_dcp(pipe))
 968                 goto usbhsf_pio_prepare_pop;
 969
 970         fifo = usbhsf_get_dma_fifo(priv, pkt);
 971         if (!fifo)
 972                 goto usbhsf_pio_prepare_pop;
 973
 974         if ((uintptr_t)pkt->buf & (USBHS_USB_DMAC_XFER_SIZE - 1))
 975                 goto usbhsf_pio_prepare_pop;
 976
 977         usbhs_pipe_config_change_bfre(pipe, 1);
 978
 979         ret = usbhsf_fifo_select(pipe, fifo, 0);
 980         if (ret < 0)
 981                 goto usbhsf_pio_prepare_pop;
 982
 983         if (usbhsf_dma_map(pkt) < 0)
 984                 goto usbhsf_pio_prepare_pop_unselect;
 985
 986         /* DMA */
 987
 988         /*
 989          * usbhs_fifo_dma_pop_handler :: prepare
 990          * enabled irq to come here.
 991          * but it is no longer needed for DMA. disable it.
 992          */
 993         usbhsf_rx_irq_ctrl(pipe, 0);
 994
 995         pkt->trans = pkt->length;
 996
 997         INIT_WORK(&pkt->work, xfer_work);
 998         schedule_work(&pkt->work);
 999
1000         return 0;
1001
1002 usbhsf_pio_prepare_pop_unselect:
1003         usbhsf_fifo_unselect(pipe, fifo);
1004 usbhsf_pio_prepare_pop:
1005
1006         /*
1007          * change handler to PIO
1008          */
1009         pkt->handler = &usbhs_fifo_pio_pop_handler;
1010         usbhs_pipe_config_change_bfre(pipe, 0);
1011
1012         return pkt->handler->prepare(pkt, is_done);
1013 }
1014
1015 static int usbhsf_dma_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
1016 {
1017         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1018
1019         if (usbhs_get_dparam(priv, has_usb_dmac))
1020                 return usbhsf_dma_prepare_pop_with_usb_dmac(pkt, is_done);
1021         else
1022                 return usbhsf_dma_prepare_pop_with_rx_irq(pkt, is_done);
1023 }
1024
1025 static int usbhsf_dma_try_pop_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1026 {
1027         struct usbhs_pipe *pipe = pkt->pipe;
1028         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1029         struct usbhs_fifo *fifo;
1030         int len, ret;
1031
1032         if (usbhs_pipe_is_busy(pipe))
1033                 return 0;
1034
1035         if (usbhs_pipe_is_dcp(pipe))
1036                 goto usbhsf_pio_prepare_pop;
1037
1038         /* get enable DMA fifo */
1039         fifo = usbhsf_get_dma_fifo(priv, pkt);
1040         if (!fifo)
1041                 goto usbhsf_pio_prepare_pop;
1042
1043         if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
1044                 goto usbhsf_pio_prepare_pop;
1045
1046         ret = usbhsf_fifo_select(pipe, fifo, 0);
1047         if (ret < 0)
1048                 goto usbhsf_pio_prepare_pop;
1049
1050         /* use PIO if packet is less than pio_dma_border */
1051         len = usbhsf_fifo_rcv_len(priv, fifo);
1052         len = min(pkt->length - pkt->actual, len);
1053         if (len & 0x7) /* 8byte alignment */
1054                 goto usbhsf_pio_prepare_pop_unselect;
1055
1056         if (len < usbhs_get_dparam(priv, pio_dma_border))
1057                 goto usbhsf_pio_prepare_pop_unselect;
1058
1059         ret = usbhsf_fifo_barrier(priv, fifo);
1060         if (ret < 0)
1061                 goto usbhsf_pio_prepare_pop_unselect;
1062
1063         if (usbhsf_dma_map(pkt) < 0)
1064                 goto usbhsf_pio_prepare_pop_unselect;
1065
1066         /* DMA */
1067
1068         /*
1069          * usbhs_fifo_dma_pop_handler :: prepare
1070          * enabled irq to come here.
1071          * but it is no longer needed for DMA. disable it.
1072          */
1073         usbhsf_rx_irq_ctrl(pipe, 0);
1074
1075         pkt->trans = len;
1076
1077         INIT_WORK(&pkt->work, xfer_work);
1078         schedule_work(&pkt->work);
1079
1080         return 0;
1081
1082 usbhsf_pio_prepare_pop_unselect:
1083         usbhsf_fifo_unselect(pipe, fifo);
1084 usbhsf_pio_prepare_pop:
1085
1086         /*
1087          * change handler to PIO
1088          */
1089         pkt->handler = &usbhs_fifo_pio_pop_handler;
1090
1091         return pkt->handler->try_run(pkt, is_done);
1092 }
1093
1094 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
1095 {
1096         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1097
1098         BUG_ON(usbhs_get_dparam(priv, has_usb_dmac));
1099
1100         return usbhsf_dma_try_pop_with_rx_irq(pkt, is_done);
1101 }
1102
1103 static int usbhsf_dma_pop_done_with_rx_irq(struct usbhs_pkt *pkt, int *is_done)
1104 {
1105         struct usbhs_pipe *pipe = pkt->pipe;
1106         int maxp = usbhs_pipe_get_maxpacket(pipe);
1107
1108         usbhsf_dma_stop(pipe, pipe->fifo);
1109         usbhsf_dma_unmap(pkt);
1110         usbhsf_fifo_unselect(pipe, pipe->fifo);
1111
1112         pkt->actual += pkt->trans;
1113
1114         if ((pkt->actual == pkt->length) ||     /* receive all data */
1115             (pkt->trans < maxp)) {              /* short packet */
1116                 *is_done = 1;
1117                 usbhs_pipe_running(pipe, 0);
1118         } else {
1119                 /* re-enable */
1120                 usbhs_pipe_running(pipe, 0);
1121                 usbhsf_prepare_pop(pkt, is_done);
1122         }
1123
1124         return 0;
1125 }
1126
1127 static size_t usbhs_dma_calc_received_size(struct usbhs_pkt *pkt,
1128                                            struct dma_chan *chan, int dtln)
1129 {
1130         struct usbhs_pipe *pipe = pkt->pipe;
1131         struct dma_tx_state state;
1132         size_t received_size;
1133         int maxp = usbhs_pipe_get_maxpacket(pipe);
1134
1135         dmaengine_tx_status(chan, pkt->cookie, &state);
1136         received_size = pkt->length - state.residue;
1137
1138         if (dtln) {
1139                 received_size -= USBHS_USB_DMAC_XFER_SIZE;
1140                 received_size &= ~(maxp - 1);
1141                 received_size += dtln;
1142         }
1143
1144         return received_size;
1145 }
1146
1147 static int usbhsf_dma_pop_done_with_usb_dmac(struct usbhs_pkt *pkt,
1148                                              int *is_done)
1149 {
1150         struct usbhs_pipe *pipe = pkt->pipe;
1151         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1152         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
1153         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
1154         int rcv_len;
1155
1156         /*
1157          * Since the driver disables rx_irq in DMA mode, the interrupt handler
1158          * cannot the BRDYSTS. So, the function clears it here because the
1159          * driver may use PIO mode next time.
1160          */
1161         usbhs_xxxsts_clear(priv, BRDYSTS, usbhs_pipe_number(pipe));
1162
1163         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
1164         usbhsf_fifo_clear(pipe, fifo);
1165         pkt->actual = usbhs_dma_calc_received_size(pkt, chan, rcv_len);
1166
1167         usbhsf_dma_stop(pipe, fifo);
1168         usbhsf_dma_unmap(pkt);
1169         usbhsf_fifo_unselect(pipe, pipe->fifo);
1170
1171         /* The driver can assume the rx transaction is always "done" */
1172         *is_done = 1;
1173
1174         return 0;
1175 }
1176
1177 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
1178 {
1179         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
1180
1181         if (usbhs_get_dparam(priv, has_usb_dmac))
1182                 return usbhsf_dma_pop_done_with_usb_dmac(pkt, is_done);
1183         else
1184                 return usbhsf_dma_pop_done_with_rx_irq(pkt, is_done);
1185 }
1186
1187 const struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
1188         .prepare        = usbhsf_dma_prepare_pop,
1189         .try_run        = usbhsf_dma_try_pop,
1190         .dma_done       = usbhsf_dma_pop_done
1191 };
1192
1193 /*
1194  *              DMA setting
1195  */
1196 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
1197 {
1198         struct sh_dmae_slave *slave = param;
1199
1200         /*
1201          * FIXME
1202          *
1203          * usbhs doesn't recognize id = 0 as valid DMA
1204          */
1205         if (0 == slave->shdma_slave.slave_id)
1206                 return false;
1207
1208         chan->private = slave;
1209
1210         return true;
1211 }
1212
1213 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1214 {
1215         if (fifo->tx_chan)
1216                 dma_release_channel(fifo->tx_chan);
1217         if (fifo->rx_chan)
1218                 dma_release_channel(fifo->rx_chan);
1219
1220         fifo->tx_chan = NULL;
1221         fifo->rx_chan = NULL;
1222 }
1223
1224 static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
1225 {
1226         dma_cap_mask_t mask;
1227
1228         dma_cap_zero(mask);
1229         dma_cap_set(DMA_SLAVE, mask);
1230         fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1231                                             &fifo->tx_slave);
1232
1233         dma_cap_zero(mask);
1234         dma_cap_set(DMA_SLAVE, mask);
1235         fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1236                                             &fifo->rx_slave);
1237 }
1238
1239 static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
1240                                int channel)
1241 {
1242         char name[16];
1243
1244         /*
1245          * To avoid complex handing for DnFIFOs, the driver uses each
1246          * DnFIFO as TX or RX direction (not bi-direction).
1247          * So, the driver uses odd channels for TX, even channels for RX.
1248          */
1249         snprintf(name, sizeof(name), "ch%d", channel);
1250         if (channel & 1) {
1251                 fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
1252                 if (IS_ERR(fifo->tx_chan))
1253                         fifo->tx_chan = NULL;
1254         } else {
1255                 fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
1256                 if (IS_ERR(fifo->rx_chan))
1257                         fifo->rx_chan = NULL;
1258         }
1259 }
1260
1261 static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
1262                             int channel)
1263 {
1264         struct device *dev = usbhs_priv_to_dev(priv);
1265
1266         if (dev->of_node)
1267                 usbhsf_dma_init_dt(dev, fifo, channel);
1268         else
1269                 usbhsf_dma_init_pdev(fifo);
1270
1271         if (fifo->tx_chan || fifo->rx_chan)
1272                 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1273                          fifo->name,
1274                          fifo->tx_chan ? "[TX]" : "    ",
1275                          fifo->rx_chan ? "[RX]" : "    ");
1276 }
1277
1278 /*
1279  *              irq functions
1280  */
1281 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1282                             struct usbhs_irq_state *irq_state)
1283 {
1284         struct usbhs_pipe *pipe;
1285         struct device *dev = usbhs_priv_to_dev(priv);
1286         int i, ret;
1287
1288         if (!irq_state->bempsts) {
1289                 dev_err(dev, "debug %s !!\n", __func__);
1290                 return -EIO;
1291         }
1292
1293         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1294
1295         /*
1296          * search interrupted "pipe"
1297          * not "uep".
1298          */
1299         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1300                 if (!(irq_state->bempsts & (1 << i)))
1301                         continue;
1302
1303                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1304                 if (ret < 0)
1305                         dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1306         }
1307
1308         return 0;
1309 }
1310
1311 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1312                             struct usbhs_irq_state *irq_state)
1313 {
1314         struct usbhs_pipe *pipe;
1315         struct device *dev = usbhs_priv_to_dev(priv);
1316         int i, ret;
1317
1318         if (!irq_state->brdysts) {
1319                 dev_err(dev, "debug %s !!\n", __func__);
1320                 return -EIO;
1321         }
1322
1323         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1324
1325         /*
1326          * search interrupted "pipe"
1327          * not "uep".
1328          */
1329         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1330                 if (!(irq_state->brdysts & (1 << i)))
1331                         continue;
1332
1333                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1334                 if (ret < 0)
1335                         dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1336         }
1337
1338         return 0;
1339 }
1340
1341 static void usbhsf_dma_complete(void *arg)
1342 {
1343         struct usbhs_pipe *pipe = arg;
1344         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1345         struct device *dev = usbhs_priv_to_dev(priv);
1346         int ret;
1347
1348         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1349         if (ret < 0)
1350                 dev_err(dev, "dma_complete run_error %d : %d\n",
1351                         usbhs_pipe_number(pipe), ret);
1352 }
1353
1354 void usbhs_fifo_clear_dcp(struct usbhs_pipe *pipe)
1355 {
1356         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1357         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
1358
1359         /* clear DCP FIFO of transmission */
1360         if (usbhsf_fifo_select(pipe, fifo, 1) < 0)
1361                 return;
1362         usbhsf_fifo_clear(pipe, fifo);
1363         usbhsf_fifo_unselect(pipe, fifo);
1364
1365         /* clear DCP FIFO of reception */
1366         if (usbhsf_fifo_select(pipe, fifo, 0) < 0)
1367                 return;
1368         usbhsf_fifo_clear(pipe, fifo);
1369         usbhsf_fifo_unselect(pipe, fifo);
1370 }
1371
1372 /*
1373  *              fifo init
1374  */
1375 void usbhs_fifo_init(struct usbhs_priv *priv)
1376 {
1377         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1378         struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1379         struct usbhs_fifo *dfifo;
1380         int i;
1381
1382         mod->irq_empty          = usbhsf_irq_empty;
1383         mod->irq_ready          = usbhsf_irq_ready;
1384         mod->irq_bempsts        = 0;
1385         mod->irq_brdysts        = 0;
1386
1387         cfifo->pipe     = NULL;
1388         usbhs_for_each_dfifo(priv, dfifo, i)
1389                 dfifo->pipe     = NULL;
1390 }
1391
1392 void usbhs_fifo_quit(struct usbhs_priv *priv)
1393 {
1394         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1395
1396         mod->irq_empty          = NULL;
1397         mod->irq_ready          = NULL;
1398         mod->irq_bempsts        = 0;
1399         mod->irq_brdysts        = 0;
1400 }
1401
1402 #define __USBHS_DFIFO_INIT(priv, fifo, channel, fifo_port)              \
1403 do {                                                                    \
1404         fifo = usbhsf_get_dnfifo(priv, channel);                        \
1405         fifo->name      = "D"#channel"FIFO";                            \
1406         fifo->port      = fifo_port;                                    \
1407         fifo->sel       = D##channel##FIFOSEL;                          \
1408         fifo->ctr       = D##channel##FIFOCTR;                          \
1409         fifo->tx_slave.shdma_slave.slave_id =                           \
1410                         usbhs_get_dparam(priv, d##channel##_tx_id);     \
1411         fifo->rx_slave.shdma_slave.slave_id =                           \
1412                         usbhs_get_dparam(priv, d##channel##_rx_id);     \
1413         usbhsf_dma_init(priv, fifo, channel);                           \
1414 } while (0)
1415
1416 #define USBHS_DFIFO_INIT(priv, fifo, channel)                           \
1417                 __USBHS_DFIFO_INIT(priv, fifo, channel, D##channel##FIFO)
1418 #define USBHS_DFIFO_INIT_NO_PORT(priv, fifo, channel)                   \
1419                 __USBHS_DFIFO_INIT(priv, fifo, channel, 0)
1420
1421 int usbhs_fifo_probe(struct usbhs_priv *priv)
1422 {
1423         struct usbhs_fifo *fifo;
1424
1425         /* CFIFO */
1426         fifo = usbhsf_get_cfifo(priv);
1427         fifo->name      = "CFIFO";
1428         fifo->port      = CFIFO;
1429         fifo->sel       = CFIFOSEL;
1430         fifo->ctr       = CFIFOCTR;
1431
1432         /* DFIFO */
1433         USBHS_DFIFO_INIT(priv, fifo, 0);
1434         USBHS_DFIFO_INIT(priv, fifo, 1);
1435         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 2);
1436         USBHS_DFIFO_INIT_NO_PORT(priv, fifo, 3);
1437
1438         return 0;
1439 }
1440
1441 void usbhs_fifo_remove(struct usbhs_priv *priv)
1442 {
1443         struct usbhs_fifo *fifo;
1444         int i;
1445
1446         usbhs_for_each_dfifo(priv, fifo, i)
1447                 usbhsf_dma_quit(priv, fifo);
1448 }