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