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_get_d0fifo(p)    (&((p)->fifo_info.d0fifo))
  25 #define usbhsf_get_d1fifo(p)    (&((p)->fifo_info.d1fifo))
  26 #define usbhsf_is_cfifo(p, f)   (usbhsf_get_cfifo(p) == f)
  27
  28 #define usbhsf_fifo_is_busy(f)  ((f)->pipe) /* see usbhs_pipe_select_fifo */
  29
  30 /*
  31  *              packet initialize
  32  */
  33 void usbhs_pkt_init(struct usbhs_pkt *pkt)
  34 {
  35         INIT_LIST_HEAD(&pkt->node);
  36 }
  37
  38 /*
  39  *              packet control function
  40  */
  41 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
  42 {
  43         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
  44         struct device *dev = usbhs_priv_to_dev(priv);
  45
  46         dev_err(dev, "null handler\n");
  47
  48         return -EINVAL;
  49 }
  50
  51 static struct usbhs_pkt_handle usbhsf_null_handler = {
  52         .prepare = usbhsf_null_handle,
  53         .try_run = usbhsf_null_handle,
  54 };
  55
  56 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
  57                     void (*done)(struct usbhs_priv *priv,
  58                                  struct usbhs_pkt *pkt),
  59                     void *buf, int len, int zero, int sequence)
  60 {
  61         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
  62         struct device *dev = usbhs_priv_to_dev(priv);
  63         unsigned long flags;
  64
  65         if (!done) {
  66                 dev_err(dev, "no done function\n");
  67                 return;
  68         }
  69
  70         /********************  spin lock ********************/
  71         usbhs_lock(priv, flags);
  72
  73         if (!pipe->handler) {
  74                 dev_err(dev, "no handler function\n");
  75                 pipe->handler = &usbhsf_null_handler;
  76         }
  77
  78         list_move_tail(&pkt->node, &pipe->list);
  79
  80         /*
  81          * each pkt must hold own handler.
  82          * because handler might be changed by its situation.
  83          * dma handler -> pio handler.
  84          */
  85         pkt->pipe       = pipe;
  86         pkt->buf        = buf;
  87         pkt->handler    = pipe->handler;
  88         pkt->length     = len;
  89         pkt->zero       = zero;
  90         pkt->actual     = 0;
  91         pkt->done       = done;
  92         pkt->sequence   = sequence;
  93
  94         usbhs_unlock(priv, flags);
  95         /********************  spin unlock ******************/
  96 }
  97
  98 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
  99 {
 100         list_del_init(&pkt->node);
 101 }
 102
 103 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
 104 {
 105         if (list_empty(&pipe->list))
 106                 return NULL;
 107
 108         return list_first_entry(&pipe->list, struct usbhs_pkt, node);
 109 }
 110
 111 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
 112 {
 113         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 114         unsigned long flags;
 115
 116         /********************  spin lock ********************/
 117         usbhs_lock(priv, flags);
 118
 119         if (!pkt)
 120                 pkt = __usbhsf_pkt_get(pipe);
 121
 122         if (pkt)
 123                 __usbhsf_pkt_del(pkt);
 124
 125         usbhs_unlock(priv, flags);
 126         /********************  spin unlock ******************/
 127
 128         return pkt;
 129 }
 130
 131 enum {
 132         USBHSF_PKT_PREPARE,
 133         USBHSF_PKT_TRY_RUN,
 134         USBHSF_PKT_DMA_DONE,
 135 };
 136
 137 static int usbhsf_pkt_handler(struct usbhs_pipe *pipe, int type)
 138 {
 139         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 140         struct usbhs_pkt *pkt;
 141         struct device *dev = usbhs_priv_to_dev(priv);
 142         int (*func)(struct usbhs_pkt *pkt, int *is_done);
 143         unsigned long flags;
 144         int ret = 0;
 145         int is_done = 0;
 146
 147         /********************  spin lock ********************/
 148         usbhs_lock(priv, flags);
 149
 150         pkt = __usbhsf_pkt_get(pipe);
 151         if (!pkt)
 152                 goto __usbhs_pkt_handler_end;
 153
 154         switch (type) {
 155         case USBHSF_PKT_PREPARE:
 156                 func = pkt->handler->prepare;
 157                 break;
 158         case USBHSF_PKT_TRY_RUN:
 159                 func = pkt->handler->try_run;
 160                 break;
 161         case USBHSF_PKT_DMA_DONE:
 162                 func = pkt->handler->dma_done;
 163                 break;
 164         default:
 165                 dev_err(dev, "unknown pkt handler\n");
 166                 goto __usbhs_pkt_handler_end;
 167         }
 168
 169         ret = func(pkt, &is_done);
 170
 171         if (is_done)
 172                 __usbhsf_pkt_del(pkt);
 173
 174 __usbhs_pkt_handler_end:
 175         usbhs_unlock(priv, flags);
 176         /********************  spin unlock ******************/
 177
 178         if (is_done) {
 179                 pkt->done(priv, pkt);
 180                 usbhs_pkt_start(pipe);
 181         }
 182
 183         return ret;
 184 }
 185
 186 void usbhs_pkt_start(struct usbhs_pipe *pipe)
 187 {
 188         usbhsf_pkt_handler(pipe, USBHSF_PKT_PREPARE);
 189 }
 190
 191 /*
 192  *              irq enable/disable function
 193  */
 194 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_bempsts, e)
 195 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, irq_brdysts, e)
 196 #define usbhsf_irq_callback_ctrl(pipe, status, enable)                  \
 197         ({                                                              \
 198                 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);     \
 199                 struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
 200                 u16 status = (1 << usbhs_pipe_number(pipe));            \
 201                 if (!mod)                                               \
 202                         return;                                         \
 203                 if (enable)                                             \
 204                         mod->status |= status;                          \
 205                 else                                                    \
 206                         mod->status &= ~status;                         \
 207                 usbhs_irq_callback_update(priv, mod);                   \
 208         })
 209
 210 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 211 {
 212         /*
 213          * And DCP pipe can NOT use "ready interrupt" for "send"
 214          * it should use "empty" interrupt.
 215          * see
 216          *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
 217          *
 218          * on the other hand, normal pipe can use "ready interrupt" for "send"
 219          * even though it is single/double buffer
 220          */
 221         if (usbhs_pipe_is_dcp(pipe))
 222                 usbhsf_irq_empty_ctrl(pipe, enable);
 223         else
 224                 usbhsf_irq_ready_ctrl(pipe, enable);
 225 }
 226
 227 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 228 {
 229         usbhsf_irq_ready_ctrl(pipe, enable);
 230 }
 231
 232 /*
 233  *              FIFO ctrl
 234  */
 235 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
 236                                    struct usbhs_fifo *fifo)
 237 {
 238         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 239
 240         usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
 241 }
 242
 243 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
 244                                struct usbhs_fifo *fifo)
 245 {
 246         int timeout = 1024;
 247
 248         do {
 249                 /* The FIFO port is accessible */
 250                 if (usbhs_read(priv, fifo->ctr) & FRDY)
 251                         return 0;
 252
 253                 udelay(10);
 254         } while (timeout--);
 255
 256         return -EBUSY;
 257 }
 258
 259 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
 260                               struct usbhs_fifo *fifo)
 261 {
 262         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 263
 264         if (!usbhs_pipe_is_dcp(pipe))
 265                 usbhsf_fifo_barrier(priv, fifo);
 266
 267         usbhs_write(priv, fifo->ctr, BCLR);
 268 }
 269
 270 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
 271                                struct usbhs_fifo *fifo)
 272 {
 273         return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
 274 }
 275
 276 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
 277                                  struct usbhs_fifo *fifo)
 278 {
 279         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 280
 281         usbhs_pipe_select_fifo(pipe, NULL);
 282         usbhs_write(priv, fifo->sel, 0);
 283 }
 284
 285 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
 286                               struct usbhs_fifo *fifo,
 287                               int write)
 288 {
 289         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 290         struct device *dev = usbhs_priv_to_dev(priv);
 291         int timeout = 1024;
 292         u16 mask = ((1 << 5) | 0xF);            /* mask of ISEL | CURPIPE */
 293         u16 base = usbhs_pipe_number(pipe);     /* CURPIPE */
 294
 295         if (usbhs_pipe_is_busy(pipe) ||
 296             usbhsf_fifo_is_busy(fifo))
 297                 return -EBUSY;
 298
 299         if (usbhs_pipe_is_dcp(pipe)) {
 300                 base |= (1 == write) << 5;      /* ISEL */
 301
 302                 if (usbhs_mod_is_host(priv))
 303                         usbhs_dcp_dir_for_host(pipe, write);
 304         }
 305
 306         /* "base" will be used below  */
 307         if (usbhs_get_dparam(priv, has_sudmac) && !usbhsf_is_cfifo(priv, fifo))
 308                 usbhs_write(priv, fifo->sel, base);
 309         else
 310                 usbhs_write(priv, fifo->sel, base | MBW_32);
 311
 312         /* check ISEL and CURPIPE value */
 313         while (timeout--) {
 314                 if (base == (mask & usbhs_read(priv, fifo->sel))) {
 315                         usbhs_pipe_select_fifo(pipe, fifo);
 316                         return 0;
 317                 }
 318                 udelay(10);
 319         }
 320
 321         dev_err(dev, "fifo select error\n");
 322
 323         return -EIO;
 324 }
 325
 326 /*
 327  *              DCP status stage
 328  */
 329 static int usbhs_dcp_dir_switch_to_write(struct usbhs_pkt *pkt, int *is_done)
 330 {
 331         struct usbhs_pipe *pipe = pkt->pipe;
 332         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 333         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 334         struct device *dev = usbhs_priv_to_dev(priv);
 335         int ret;
 336
 337         usbhs_pipe_disable(pipe);
 338
 339         ret = usbhsf_fifo_select(pipe, fifo, 1);
 340         if (ret < 0) {
 341                 dev_err(dev, "%s() faile\n", __func__);
 342                 return ret;
 343         }
 344
 345         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 346
 347         usbhsf_fifo_clear(pipe, fifo);
 348         usbhsf_send_terminator(pipe, fifo);
 349
 350         usbhsf_fifo_unselect(pipe, fifo);
 351
 352         usbhsf_tx_irq_ctrl(pipe, 1);
 353         usbhs_pipe_enable(pipe);
 354
 355         return ret;
 356 }
 357
 358 static int usbhs_dcp_dir_switch_to_read(struct usbhs_pkt *pkt, int *is_done)
 359 {
 360         struct usbhs_pipe *pipe = pkt->pipe;
 361         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 362         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 363         struct device *dev = usbhs_priv_to_dev(priv);
 364         int ret;
 365
 366         usbhs_pipe_disable(pipe);
 367
 368         ret = usbhsf_fifo_select(pipe, fifo, 0);
 369         if (ret < 0) {
 370                 dev_err(dev, "%s() fail\n", __func__);
 371                 return ret;
 372         }
 373
 374         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 375         usbhsf_fifo_clear(pipe, fifo);
 376
 377         usbhsf_fifo_unselect(pipe, fifo);
 378
 379         usbhsf_rx_irq_ctrl(pipe, 1);
 380         usbhs_pipe_enable(pipe);
 381
 382         return ret;
 383
 384 }
 385
 386 static int usbhs_dcp_dir_switch_done(struct usbhs_pkt *pkt, int *is_done)
 387 {
 388         struct usbhs_pipe *pipe = pkt->pipe;
 389
 390         if (pkt->handler == &usbhs_dcp_status_stage_in_handler)
 391                 usbhsf_tx_irq_ctrl(pipe, 0);
 392         else
 393                 usbhsf_rx_irq_ctrl(pipe, 0);
 394
 395         pkt->actual = pkt->length;
 396         *is_done = 1;
 397
 398         return 0;
 399 }
 400
 401 struct usbhs_pkt_handle usbhs_dcp_status_stage_in_handler = {
 402         .prepare = usbhs_dcp_dir_switch_to_write,
 403         .try_run = usbhs_dcp_dir_switch_done,
 404 };
 405
 406 struct usbhs_pkt_handle usbhs_dcp_status_stage_out_handler = {
 407         .prepare = usbhs_dcp_dir_switch_to_read,
 408         .try_run = usbhs_dcp_dir_switch_done,
 409 };
 410
 411 /*
 412  *              DCP data stage (push)
 413  */
 414 static int usbhsf_dcp_data_stage_try_push(struct usbhs_pkt *pkt, int *is_done)
 415 {
 416         struct usbhs_pipe *pipe = pkt->pipe;
 417
 418         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 419
 420         /*
 421          * change handler to PIO push
 422          */
 423         pkt->handler = &usbhs_fifo_pio_push_handler;
 424
 425         return pkt->handler->prepare(pkt, is_done);
 426 }
 427
 428 struct usbhs_pkt_handle usbhs_dcp_data_stage_out_handler = {
 429         .prepare = usbhsf_dcp_data_stage_try_push,
 430 };
 431
 432 /*
 433  *              DCP data stage (pop)
 434  */
 435 static int usbhsf_dcp_data_stage_prepare_pop(struct usbhs_pkt *pkt,
 436                                              int *is_done)
 437 {
 438         struct usbhs_pipe *pipe = pkt->pipe;
 439         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 440         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv);
 441
 442         if (usbhs_pipe_is_busy(pipe))
 443                 return 0;
 444
 445         /*
 446          * prepare pop for DCP should
 447          *  - change DCP direction,
 448          *  - clear fifo
 449          *  - DATA1
 450          */
 451         usbhs_pipe_disable(pipe);
 452
 453         usbhs_pipe_sequence_data1(pipe); /* DATA1 */
 454
 455         usbhsf_fifo_select(pipe, fifo, 0);
 456         usbhsf_fifo_clear(pipe, fifo);
 457         usbhsf_fifo_unselect(pipe, fifo);
 458
 459         /*
 460          * change handler to PIO pop
 461          */
 462         pkt->handler = &usbhs_fifo_pio_pop_handler;
 463
 464         return pkt->handler->prepare(pkt, is_done);
 465 }
 466
 467 struct usbhs_pkt_handle usbhs_dcp_data_stage_in_handler = {
 468         .prepare = usbhsf_dcp_data_stage_prepare_pop,
 469 };
 470
 471 /*
 472  *              PIO push handler
 473  */
 474 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 475 {
 476         struct usbhs_pipe *pipe = pkt->pipe;
 477         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 478         struct device *dev = usbhs_priv_to_dev(priv);
 479         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 480         void __iomem *addr = priv->base + fifo->port;
 481         u8 *buf;
 482         int maxp = usbhs_pipe_get_maxpacket(pipe);
 483         int total_len;
 484         int i, ret, len;
 485         int is_short;
 486
 487         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 488         pkt->sequence = -1; /* -1 sequence will be ignored */
 489
 490         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 491
 492         ret = usbhsf_fifo_select(pipe, fifo, 1);
 493         if (ret < 0)
 494                 return 0;
 495
 496         ret = usbhs_pipe_is_accessible(pipe);
 497         if (ret < 0) {
 498                 /* inaccessible pipe is not an error */
 499                 ret = 0;
 500                 goto usbhs_fifo_write_busy;
 501         }
 502
 503         ret = usbhsf_fifo_barrier(priv, fifo);
 504         if (ret < 0)
 505                 goto usbhs_fifo_write_busy;
 506
 507         buf             = pkt->buf    + pkt->actual;
 508         len             = pkt->length - pkt->actual;
 509         len             = min(len, maxp);
 510         total_len       = len;
 511         is_short        = total_len < maxp;
 512
 513         /*
 514          * FIXME
 515          *
 516          * 32-bit access only
 517          */
 518         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 519                 iowrite32_rep(addr, buf, len / 4);
 520                 len %= 4;
 521                 buf += total_len - len;
 522         }
 523
 524         /* the rest operation */
 525         for (i = 0; i < len; i++)
 526                 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
 527
 528         /*
 529          * variable update
 530          */
 531         pkt->actual += total_len;
 532
 533         if (pkt->actual < pkt->length)
 534                 *is_done = 0;           /* there are remainder data */
 535         else if (is_short)
 536                 *is_done = 1;           /* short packet */
 537         else
 538                 *is_done = !pkt->zero;  /* send zero packet ? */
 539
 540         /*
 541          * pipe/irq handling
 542          */
 543         if (is_short)
 544                 usbhsf_send_terminator(pipe, fifo);
 545
 546         usbhsf_tx_irq_ctrl(pipe, !*is_done);
 547         usbhs_pipe_enable(pipe);
 548
 549         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 550                 usbhs_pipe_number(pipe),
 551                 pkt->length, pkt->actual, *is_done, pkt->zero);
 552
 553         /*
 554          * Transmission end
 555          */
 556         if (*is_done) {
 557                 if (usbhs_pipe_is_dcp(pipe))
 558                         usbhs_dcp_control_transfer_done(pipe);
 559         }
 560
 561         usbhsf_fifo_unselect(pipe, fifo);
 562
 563         return 0;
 564
 565 usbhs_fifo_write_busy:
 566         usbhsf_fifo_unselect(pipe, fifo);
 567
 568         /*
 569          * pipe is busy.
 570          * retry in interrupt
 571          */
 572         usbhsf_tx_irq_ctrl(pipe, 1);
 573
 574         return ret;
 575 }
 576
 577 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
 578         .prepare = usbhsf_pio_try_push,
 579         .try_run = usbhsf_pio_try_push,
 580 };
 581
 582 /*
 583  *              PIO pop handler
 584  */
 585 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 586 {
 587         struct usbhs_pipe *pipe = pkt->pipe;
 588
 589         if (usbhs_pipe_is_busy(pipe))
 590                 return 0;
 591
 592         /*
 593          * pipe enable to prepare packet receive
 594          */
 595         usbhs_pipe_data_sequence(pipe, pkt->sequence);
 596         pkt->sequence = -1; /* -1 sequence will be ignored */
 597
 598         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->length);
 599         usbhs_pipe_enable(pipe);
 600         usbhsf_rx_irq_ctrl(pipe, 1);
 601
 602         return 0;
 603 }
 604
 605 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 606 {
 607         struct usbhs_pipe *pipe = pkt->pipe;
 608         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 609         struct device *dev = usbhs_priv_to_dev(priv);
 610         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 611         void __iomem *addr = priv->base + fifo->port;
 612         u8 *buf;
 613         u32 data = 0;
 614         int maxp = usbhs_pipe_get_maxpacket(pipe);
 615         int rcv_len, len;
 616         int i, ret;
 617         int total_len = 0;
 618
 619         ret = usbhsf_fifo_select(pipe, fifo, 0);
 620         if (ret < 0)
 621                 return 0;
 622
 623         ret = usbhsf_fifo_barrier(priv, fifo);
 624         if (ret < 0)
 625                 goto usbhs_fifo_read_busy;
 626
 627         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 628
 629         buf             = pkt->buf    + pkt->actual;
 630         len             = pkt->length - pkt->actual;
 631         len             = min(len, rcv_len);
 632         total_len       = len;
 633
 634         /*
 635          * update actual length first here to decide disable pipe.
 636          * if this pipe keeps BUF status and all data were popped,
 637          * then, next interrupt/token will be issued again
 638          */
 639         pkt->actual += total_len;
 640
 641         if ((pkt->actual == pkt->length) ||     /* receive all data */
 642             (total_len < maxp)) {               /* short packet */
 643                 *is_done = 1;
 644                 usbhsf_rx_irq_ctrl(pipe, 0);
 645                 usbhs_pipe_disable(pipe);       /* disable pipe first */
 646         }
 647
 648         /*
 649          * Buffer clear if Zero-Length packet
 650          *
 651          * see
 652          * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
 653          */
 654         if (0 == rcv_len) {
 655                 pkt->zero = 1;
 656                 usbhsf_fifo_clear(pipe, fifo);
 657                 goto usbhs_fifo_read_end;
 658         }
 659
 660         /*
 661          * FIXME
 662          *
 663          * 32-bit access only
 664          */
 665         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 666                 ioread32_rep(addr, buf, len / 4);
 667                 len %= 4;
 668                 buf += total_len - len;
 669         }
 670
 671         /* the rest operation */
 672         for (i = 0; i < len; i++) {
 673                 if (!(i & 0x03))
 674                         data = ioread32(addr);
 675
 676                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
 677         }
 678
 679 usbhs_fifo_read_end:
 680         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 681                 usbhs_pipe_number(pipe),
 682                 pkt->length, pkt->actual, *is_done, pkt->zero);
 683
 684 usbhs_fifo_read_busy:
 685         usbhsf_fifo_unselect(pipe, fifo);
 686
 687         return ret;
 688 }
 689
 690 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
 691         .prepare = usbhsf_prepare_pop,
 692         .try_run = usbhsf_pio_try_pop,
 693 };
 694
 695 /*
 696  *              DCP ctrol statge handler
 697  */
 698 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 699 {
 700         usbhs_dcp_control_transfer_done(pkt->pipe);
 701
 702         *is_done = 1;
 703
 704         return 0;
 705 }
 706
 707 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
 708         .prepare = usbhsf_ctrl_stage_end,
 709         .try_run = usbhsf_ctrl_stage_end,
 710 };
 711
 712 /*
 713  *              DMA fifo functions
 714  */
 715 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 716                                             struct usbhs_pkt *pkt)
 717 {
 718         if (&usbhs_fifo_dma_push_handler == pkt->handler)
 719                 return fifo->tx_chan;
 720
 721         if (&usbhs_fifo_dma_pop_handler == pkt->handler)
 722                 return fifo->rx_chan;
 723
 724         return NULL;
 725 }
 726
 727 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
 728                                               struct usbhs_pkt *pkt)
 729 {
 730         struct usbhs_fifo *fifo;
 731
 732         /* DMA :: D0FIFO */
 733         fifo = usbhsf_get_d0fifo(priv);
 734         if (usbhsf_dma_chan_get(fifo, pkt) &&
 735             !usbhsf_fifo_is_busy(fifo))
 736                 return fifo;
 737
 738         /* DMA :: D1FIFO */
 739         fifo = usbhsf_get_d1fifo(priv);
 740         if (usbhsf_dma_chan_get(fifo, pkt) &&
 741             !usbhsf_fifo_is_busy(fifo))
 742                 return fifo;
 743
 744         return NULL;
 745 }
 746
 747 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 748 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 749 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
 750                               struct usbhs_fifo *fifo,
 751                               u16 dreqe)
 752 {
 753         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 754
 755         usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 756 }
 757
 758 #define usbhsf_dma_map(p)       __usbhsf_dma_map_ctrl(p, 1)
 759 #define usbhsf_dma_unmap(p)     __usbhsf_dma_map_ctrl(p, 0)
 760 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 761 {
 762         struct usbhs_pipe *pipe = pkt->pipe;
 763         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 764         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 765
 766         return info->dma_map_ctrl(pkt, map);
 767 }
 768
 769 static void usbhsf_dma_complete(void *arg);
 770 static void xfer_work(struct work_struct *work)
 771 {
 772         struct usbhs_pkt *pkt = container_of(work, struct usbhs_pkt, work);
 773         struct usbhs_pipe *pipe = pkt->pipe;
 774         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 775         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 776         struct dma_async_tx_descriptor *desc;
 777         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 778         struct device *dev = usbhs_priv_to_dev(priv);
 779         enum dma_transfer_direction dir;
 780
 781         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 782
 783         desc = dmaengine_prep_slave_single(chan, pkt->dma + pkt->actual,
 784                                         pkt->trans, dir,
 785                                         DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
 786         if (!desc)
 787                 return;
 788
 789         desc->callback          = usbhsf_dma_complete;
 790         desc->callback_param    = pipe;
 791
 792         if (dmaengine_submit(desc) < 0) {
 793                 dev_err(dev, "Failed to submit dma descriptor\n");
 794                 return;
 795         }
 796
 797         dev_dbg(dev, "  %s %d (%d/ %d)\n",
 798                 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 799
 800         usbhs_pipe_set_trans_count_if_bulk(pipe, pkt->trans);
 801         usbhs_pipe_enable(pipe);
 802         usbhsf_dma_start(pipe, fifo);
 803         dma_async_issue_pending(chan);
 804 }
 805
 806 /*
 807  *              DMA push handler
 808  */
 809 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 810 {
 811         struct usbhs_pipe *pipe = pkt->pipe;
 812         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 813         struct usbhs_fifo *fifo;
 814         int len = pkt->length - pkt->actual;
 815         int ret;
 816
 817         if (usbhs_pipe_is_busy(pipe))
 818                 return 0;
 819
 820         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 821         if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
 822             usbhs_pipe_is_dcp(pipe))
 823                 goto usbhsf_pio_prepare_push;
 824
 825         if (len & 0x7) /* 8byte alignment */
 826                 goto usbhsf_pio_prepare_push;
 827
 828         if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
 829                 goto usbhsf_pio_prepare_push;
 830
 831         /* get enable DMA fifo */
 832         fifo = usbhsf_get_dma_fifo(priv, pkt);
 833         if (!fifo)
 834                 goto usbhsf_pio_prepare_push;
 835
 836         if (usbhsf_dma_map(pkt) < 0)
 837                 goto usbhsf_pio_prepare_push;
 838
 839         ret = usbhsf_fifo_select(pipe, fifo, 0);
 840         if (ret < 0)
 841                 goto usbhsf_pio_prepare_push_unmap;
 842
 843         pkt->trans = len;
 844
 845         INIT_WORK(&pkt->work, xfer_work);
 846         schedule_work(&pkt->work);
 847
 848         return 0;
 849
 850 usbhsf_pio_prepare_push_unmap:
 851         usbhsf_dma_unmap(pkt);
 852 usbhsf_pio_prepare_push:
 853         /*
 854          * change handler to PIO
 855          */
 856         pkt->handler = &usbhs_fifo_pio_push_handler;
 857
 858         return pkt->handler->prepare(pkt, is_done);
 859 }
 860
 861 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 862 {
 863         struct usbhs_pipe *pipe = pkt->pipe;
 864
 865         pkt->actual = pkt->trans;
 866
 867         *is_done = !pkt->zero;  /* send zero packet ? */
 868
 869         usbhsf_dma_stop(pipe, pipe->fifo);
 870         usbhsf_dma_unmap(pkt);
 871         usbhsf_fifo_unselect(pipe, pipe->fifo);
 872
 873         return 0;
 874 }
 875
 876 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
 877         .prepare        = usbhsf_dma_prepare_push,
 878         .dma_done       = usbhsf_dma_push_done,
 879 };
 880
 881 /*
 882  *              DMA pop handler
 883  */
 884 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
 885 {
 886         struct usbhs_pipe *pipe = pkt->pipe;
 887         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 888         struct usbhs_fifo *fifo;
 889         int len, ret;
 890
 891         if (usbhs_pipe_is_busy(pipe))
 892                 return 0;
 893
 894         if (usbhs_pipe_is_dcp(pipe))
 895                 goto usbhsf_pio_prepare_pop;
 896
 897         /* get enable DMA fifo */
 898         fifo = usbhsf_get_dma_fifo(priv, pkt);
 899         if (!fifo)
 900                 goto usbhsf_pio_prepare_pop;
 901
 902         if ((uintptr_t)(pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
 903                 goto usbhsf_pio_prepare_pop;
 904
 905         ret = usbhsf_fifo_select(pipe, fifo, 0);
 906         if (ret < 0)
 907                 goto usbhsf_pio_prepare_pop;
 908
 909         /* use PIO if packet is less than pio_dma_border */
 910         len = usbhsf_fifo_rcv_len(priv, fifo);
 911         len = min(pkt->length - pkt->actual, len);
 912         if (len & 0x7) /* 8byte alignment */
 913                 goto usbhsf_pio_prepare_pop_unselect;
 914
 915         if (len < usbhs_get_dparam(priv, pio_dma_border))
 916                 goto usbhsf_pio_prepare_pop_unselect;
 917
 918         ret = usbhsf_fifo_barrier(priv, fifo);
 919         if (ret < 0)
 920                 goto usbhsf_pio_prepare_pop_unselect;
 921
 922         if (usbhsf_dma_map(pkt) < 0)
 923                 goto usbhsf_pio_prepare_pop_unselect;
 924
 925         /* DMA */
 926
 927         /*
 928          * usbhs_fifo_dma_pop_handler :: prepare
 929          * enabled irq to come here.
 930          * but it is no longer needed for DMA. disable it.
 931          */
 932         usbhsf_rx_irq_ctrl(pipe, 0);
 933
 934         pkt->trans = len;
 935
 936         INIT_WORK(&pkt->work, xfer_work);
 937         schedule_work(&pkt->work);
 938
 939         return 0;
 940
 941 usbhsf_pio_prepare_pop_unselect:
 942         usbhsf_fifo_unselect(pipe, fifo);
 943 usbhsf_pio_prepare_pop:
 944
 945         /*
 946          * change handler to PIO
 947          */
 948         pkt->handler = &usbhs_fifo_pio_pop_handler;
 949
 950         return pkt->handler->try_run(pkt, is_done);
 951 }
 952
 953 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
 954 {
 955         struct usbhs_pipe *pipe = pkt->pipe;
 956         int maxp = usbhs_pipe_get_maxpacket(pipe);
 957
 958         usbhsf_dma_stop(pipe, pipe->fifo);
 959         usbhsf_dma_unmap(pkt);
 960         usbhsf_fifo_unselect(pipe, pipe->fifo);
 961
 962         pkt->actual += pkt->trans;
 963
 964         if ((pkt->actual == pkt->length) ||     /* receive all data */
 965             (pkt->trans < maxp)) {              /* short packet */
 966                 *is_done = 1;
 967         } else {
 968                 /* re-enable */
 969                 usbhsf_prepare_pop(pkt, is_done);
 970         }
 971
 972         return 0;
 973 }
 974
 975 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
 976         .prepare        = usbhsf_prepare_pop,
 977         .try_run        = usbhsf_dma_try_pop,
 978         .dma_done       = usbhsf_dma_pop_done
 979 };
 980
 981 /*
 982  *              DMA setting
 983  */
 984 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
 985 {
 986         struct sh_dmae_slave *slave = param;
 987
 988         /*
 989          * FIXME
 990          *
 991          * usbhs doesn't recognize id = 0 as valid DMA
 992          */
 993         if (0 == slave->shdma_slave.slave_id)
 994                 return false;
 995
 996         chan->private = slave;
 997
 998         return true;
 999 }
1000
1001 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
1002 {
1003         if (fifo->tx_chan)
1004                 dma_release_channel(fifo->tx_chan);
1005         if (fifo->rx_chan)
1006                 dma_release_channel(fifo->rx_chan);
1007
1008         fifo->tx_chan = NULL;
1009         fifo->rx_chan = NULL;
1010 }
1011
1012 static void usbhsf_dma_init(struct usbhs_priv *priv,
1013                             struct usbhs_fifo *fifo)
1014 {
1015         struct device *dev = usbhs_priv_to_dev(priv);
1016         dma_cap_mask_t mask;
1017
1018         dma_cap_zero(mask);
1019         dma_cap_set(DMA_SLAVE, mask);
1020         fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1021                                             &fifo->tx_slave);
1022
1023         dma_cap_zero(mask);
1024         dma_cap_set(DMA_SLAVE, mask);
1025         fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
1026                                             &fifo->rx_slave);
1027
1028         if (fifo->tx_chan || fifo->rx_chan)
1029                 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
1030                          fifo->name,
1031                          fifo->tx_chan ? "[TX]" : "    ",
1032                          fifo->rx_chan ? "[RX]" : "    ");
1033 }
1034
1035 /*
1036  *              irq functions
1037  */
1038 static int usbhsf_irq_empty(struct usbhs_priv *priv,
1039                             struct usbhs_irq_state *irq_state)
1040 {
1041         struct usbhs_pipe *pipe;
1042         struct device *dev = usbhs_priv_to_dev(priv);
1043         int i, ret;
1044
1045         if (!irq_state->bempsts) {
1046                 dev_err(dev, "debug %s !!\n", __func__);
1047                 return -EIO;
1048         }
1049
1050         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
1051
1052         /*
1053          * search interrupted "pipe"
1054          * not "uep".
1055          */
1056         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1057                 if (!(irq_state->bempsts & (1 << i)))
1058                         continue;
1059
1060                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1061                 if (ret < 0)
1062                         dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
1063         }
1064
1065         return 0;
1066 }
1067
1068 static int usbhsf_irq_ready(struct usbhs_priv *priv,
1069                             struct usbhs_irq_state *irq_state)
1070 {
1071         struct usbhs_pipe *pipe;
1072         struct device *dev = usbhs_priv_to_dev(priv);
1073         int i, ret;
1074
1075         if (!irq_state->brdysts) {
1076                 dev_err(dev, "debug %s !!\n", __func__);
1077                 return -EIO;
1078         }
1079
1080         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
1081
1082         /*
1083          * search interrupted "pipe"
1084          * not "uep".
1085          */
1086         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
1087                 if (!(irq_state->brdysts & (1 << i)))
1088                         continue;
1089
1090                 ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_TRY_RUN);
1091                 if (ret < 0)
1092                         dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
1093         }
1094
1095         return 0;
1096 }
1097
1098 static void usbhsf_dma_complete(void *arg)
1099 {
1100         struct usbhs_pipe *pipe = arg;
1101         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
1102         struct device *dev = usbhs_priv_to_dev(priv);
1103         int ret;
1104
1105         ret = usbhsf_pkt_handler(pipe, USBHSF_PKT_DMA_DONE);
1106         if (ret < 0)
1107                 dev_err(dev, "dma_complete run_error %d : %d\n",
1108                         usbhs_pipe_number(pipe), ret);
1109 }
1110
1111 /*
1112  *              fifo init
1113  */
1114 void usbhs_fifo_init(struct usbhs_priv *priv)
1115 {
1116         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1117         struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
1118         struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
1119         struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
1120
1121         mod->irq_empty          = usbhsf_irq_empty;
1122         mod->irq_ready          = usbhsf_irq_ready;
1123         mod->irq_bempsts        = 0;
1124         mod->irq_brdysts        = 0;
1125
1126         cfifo->pipe     = NULL;
1127         cfifo->tx_chan  = NULL;
1128         cfifo->rx_chan  = NULL;
1129
1130         d0fifo->pipe    = NULL;
1131         d0fifo->tx_chan = NULL;
1132         d0fifo->rx_chan = NULL;
1133
1134         d1fifo->pipe    = NULL;
1135         d1fifo->tx_chan = NULL;
1136         d1fifo->rx_chan = NULL;
1137
1138         usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
1139         usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
1140 }
1141
1142 void usbhs_fifo_quit(struct usbhs_priv *priv)
1143 {
1144         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
1145
1146         mod->irq_empty          = NULL;
1147         mod->irq_ready          = NULL;
1148         mod->irq_bempsts        = 0;
1149         mod->irq_brdysts        = 0;
1150
1151         usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
1152         usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
1153 }
1154
1155 int usbhs_fifo_probe(struct usbhs_priv *priv)
1156 {
1157         struct usbhs_fifo *fifo;
1158
1159         /* CFIFO */
1160         fifo = usbhsf_get_cfifo(priv);
1161         fifo->name      = "CFIFO";
1162         fifo->port      = CFIFO;
1163         fifo->sel       = CFIFOSEL;
1164         fifo->ctr       = CFIFOCTR;
1165
1166         /* D0FIFO */
1167         fifo = usbhsf_get_d0fifo(priv);
1168         fifo->name      = "D0FIFO";
1169         fifo->port      = D0FIFO;
1170         fifo->sel       = D0FIFOSEL;
1171         fifo->ctr       = D0FIFOCTR;
1172         fifo->tx_slave.shdma_slave.slave_id     = usbhs_get_dparam(priv, d0_tx_id);
1173         fifo->rx_slave.shdma_slave.slave_id     = usbhs_get_dparam(priv, d0_rx_id);
1174
1175         /* D1FIFO */
1176         fifo = usbhsf_get_d1fifo(priv);
1177         fifo->name      = "D1FIFO";
1178         fifo->port      = D1FIFO;
1179         fifo->sel       = D1FIFOSEL;
1180         fifo->ctr       = D1FIFOCTR;
1181         fifo->tx_slave.shdma_slave.slave_id     = usbhs_get_dparam(priv, d1_tx_id);
1182         fifo->rx_slave.shdma_slave.slave_id     = usbhs_get_dparam(priv, d1_rx_id);
1183
1184         return 0;
1185 }
1186
1187 void usbhs_fifo_remove(struct usbhs_priv *priv)
1188 {
1189 }