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 "./common.h"
  20 #include "./pipe.h"
  21
  22 #define usbhsf_get_cfifo(p)     (&((p)->fifo_info.cfifo))
  23 #define usbhsf_get_d0fifo(p)    (&((p)->fifo_info.d0fifo))
  24 #define usbhsf_get_d1fifo(p)    (&((p)->fifo_info.d1fifo))
  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         pkt->dma = DMA_ADDR_INVALID;
  34         INIT_LIST_HEAD(&pkt->node);
  35 }
  36
  37 /*
  38  *              packet control function
  39  */
  40 static int usbhsf_null_handle(struct usbhs_pkt *pkt, int *is_done)
  41 {
  42         struct usbhs_priv *priv = usbhs_pipe_to_priv(pkt->pipe);
  43         struct device *dev = usbhs_priv_to_dev(priv);
  44
  45         dev_err(dev, "null handler\n");
  46
  47         return -EINVAL;
  48 }
  49
  50 static struct usbhs_pkt_handle usbhsf_null_handler = {
  51         .prepare = usbhsf_null_handle,
  52         .try_run = usbhsf_null_handle,
  53 };
  54
  55 void usbhs_pkt_push(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt,
  56                     struct usbhs_pkt_handle *handler,
  57                     void *buf, int len, int zero)
  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         /********************  spin lock ********************/
  64         usbhs_lock(priv, flags);
  65
  66         if (!handler) {
  67                 dev_err(dev, "no handler function\n");
  68                 handler = &usbhsf_null_handler;
  69         }
  70
  71         list_del_init(&pkt->node);
  72         list_add_tail(&pkt->node, &pipe->list);
  73
  74         pkt->pipe       = pipe;
  75         pkt->buf        = buf;
  76         pkt->handler    = handler;
  77         pkt->length     = len;
  78         pkt->zero       = zero;
  79         pkt->actual     = 0;
  80
  81         usbhs_unlock(priv, flags);
  82         /********************  spin unlock ******************/
  83
  84         usbhs_pkt_start(pipe);
  85 }
  86
  87 static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
  88 {
  89         list_del_init(&pkt->node);
  90 }
  91
  92 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
  93 {
  94         if (list_empty(&pipe->list))
  95                 return NULL;
  96
  97         return list_entry(pipe->list.next, struct usbhs_pkt, node);
  98 }
  99
 100 struct usbhs_pkt *usbhs_pkt_pop(struct usbhs_pipe *pipe, struct usbhs_pkt *pkt)
 101 {
 102         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 103         unsigned long flags;
 104
 105         /********************  spin lock ********************/
 106         usbhs_lock(priv, flags);
 107
 108         if (!pkt)
 109                 pkt = __usbhsf_pkt_get(pipe);
 110
 111         if (pkt)
 112                 __usbhsf_pkt_del(pkt);
 113
 114         usbhs_unlock(priv, flags);
 115         /********************  spin unlock ******************/
 116
 117         return pkt;
 118 }
 119
 120 int __usbhs_pkt_handler(struct usbhs_pipe *pipe, int type)
 121 {
 122         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 123         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 124         struct usbhs_pkt *pkt;
 125         struct device *dev = usbhs_priv_to_dev(priv);
 126         int (*func)(struct usbhs_pkt *pkt, int *is_done);
 127         unsigned long flags;
 128         int ret = 0;
 129         int is_done = 0;
 130
 131         /********************  spin lock ********************/
 132         usbhs_lock(priv, flags);
 133
 134         pkt = __usbhsf_pkt_get(pipe);
 135         if (!pkt)
 136                 goto __usbhs_pkt_handler_end;
 137
 138         switch (type) {
 139         case USBHSF_PKT_PREPARE:
 140                 func = pkt->handler->prepare;
 141                 break;
 142         case USBHSF_PKT_TRY_RUN:
 143                 func = pkt->handler->try_run;
 144                 break;
 145         case USBHSF_PKT_DMA_DONE:
 146                 func = pkt->handler->dma_done;
 147                 break;
 148         default:
 149                 dev_err(dev, "unknown pkt hander\n");
 150                 goto __usbhs_pkt_handler_end;
 151         }
 152
 153         ret = func(pkt, &is_done);
 154
 155         if (is_done)
 156                 __usbhsf_pkt_del(pkt);
 157
 158 __usbhs_pkt_handler_end:
 159         usbhs_unlock(priv, flags);
 160         /********************  spin unlock ******************/
 161
 162         if (is_done) {
 163                 info->done(pkt);
 164                 usbhs_pkt_start(pipe);
 165         }
 166
 167         return ret;
 168 }
 169
 170 /*
 171  *              irq enable/disable function
 172  */
 173 #define usbhsf_irq_empty_ctrl(p, e) usbhsf_irq_callback_ctrl(p, bempsts, e)
 174 #define usbhsf_irq_ready_ctrl(p, e) usbhsf_irq_callback_ctrl(p, brdysts, e)
 175 #define usbhsf_irq_callback_ctrl(pipe, status, enable)                  \
 176         ({                                                              \
 177                 struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);     \
 178                 struct usbhs_mod *mod = usbhs_mod_get_current(priv);    \
 179                 u16 status = (1 << usbhs_pipe_number(pipe));            \
 180                 if (!mod)                                               \
 181                         return;                                         \
 182                 if (enable)                                             \
 183                         mod->irq_##status |= status;                    \
 184                 else                                                    \
 185                         mod->irq_##status &= ~status;                   \
 186                 usbhs_irq_callback_update(priv, mod);                   \
 187         })
 188
 189 static void usbhsf_tx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 190 {
 191         /*
 192          * And DCP pipe can NOT use "ready interrupt" for "send"
 193          * it should use "empty" interrupt.
 194          * see
 195          *   "Operation" - "Interrupt Function" - "BRDY Interrupt"
 196          *
 197          * on the other hand, normal pipe can use "ready interrupt" for "send"
 198          * even though it is single/double buffer
 199          */
 200         if (usbhs_pipe_is_dcp(pipe))
 201                 usbhsf_irq_empty_ctrl(pipe, enable);
 202         else
 203                 usbhsf_irq_ready_ctrl(pipe, enable);
 204 }
 205
 206 static void usbhsf_rx_irq_ctrl(struct usbhs_pipe *pipe, int enable)
 207 {
 208         usbhsf_irq_ready_ctrl(pipe, enable);
 209 }
 210
 211 /*
 212  *              FIFO ctrl
 213  */
 214 static void usbhsf_send_terminator(struct usbhs_pipe *pipe,
 215                                    struct usbhs_fifo *fifo)
 216 {
 217         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 218
 219         usbhs_bset(priv, fifo->ctr, BVAL, BVAL);
 220 }
 221
 222 static int usbhsf_fifo_barrier(struct usbhs_priv *priv,
 223                                struct usbhs_fifo *fifo)
 224 {
 225         int timeout = 1024;
 226
 227         do {
 228                 /* The FIFO port is accessible */
 229                 if (usbhs_read(priv, fifo->ctr) & FRDY)
 230                         return 0;
 231
 232                 udelay(10);
 233         } while (timeout--);
 234
 235         return -EBUSY;
 236 }
 237
 238 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
 239                               struct usbhs_fifo *fifo)
 240 {
 241         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 242
 243         if (!usbhs_pipe_is_dcp(pipe))
 244                 usbhsf_fifo_barrier(priv, fifo);
 245
 246         usbhs_write(priv, fifo->ctr, BCLR);
 247 }
 248
 249 static int usbhsf_fifo_rcv_len(struct usbhs_priv *priv,
 250                                struct usbhs_fifo *fifo)
 251 {
 252         return usbhs_read(priv, fifo->ctr) & DTLN_MASK;
 253 }
 254
 255 static void usbhsf_fifo_unselect(struct usbhs_pipe *pipe,
 256                                  struct usbhs_fifo *fifo)
 257 {
 258         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 259
 260         usbhs_pipe_select_fifo(pipe, NULL);
 261         usbhs_write(priv, fifo->sel, 0);
 262 }
 263
 264 static int usbhsf_fifo_select(struct usbhs_pipe *pipe,
 265                               struct usbhs_fifo *fifo,
 266                               int write)
 267 {
 268         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 269         struct device *dev = usbhs_priv_to_dev(priv);
 270         int timeout = 1024;
 271         u16 mask = ((1 << 5) | 0xF);            /* mask of ISEL | CURPIPE */
 272         u16 base = usbhs_pipe_number(pipe);     /* CURPIPE */
 273
 274         if (usbhs_pipe_is_busy(pipe) ||
 275             usbhsf_fifo_is_busy(fifo))
 276                 return -EBUSY;
 277
 278         if (usbhs_pipe_is_dcp(pipe))
 279                 base |= (1 == write) << 5;      /* ISEL */
 280
 281         /* "base" will be used below  */
 282         usbhs_write(priv, fifo->sel, base | MBW_32);
 283
 284         /* check ISEL and CURPIPE value */
 285         while (timeout--) {
 286                 if (base == (mask & usbhs_read(priv, fifo->sel))) {
 287                         usbhs_pipe_select_fifo(pipe, fifo);
 288                         return 0;
 289                 }
 290                 udelay(10);
 291         }
 292
 293         dev_err(dev, "fifo select error\n");
 294
 295         return -EIO;
 296 }
 297
 298 /*
 299  *              PIO push handler
 300  */
 301 static int usbhsf_pio_try_push(struct usbhs_pkt *pkt, int *is_done)
 302 {
 303         struct usbhs_pipe *pipe = pkt->pipe;
 304         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 305         struct device *dev = usbhs_priv_to_dev(priv);
 306         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 307         void __iomem *addr = priv->base + fifo->port;
 308         u8 *buf;
 309         int maxp = usbhs_pipe_get_maxpacket(pipe);
 310         int total_len;
 311         int i, ret, len;
 312         int is_short;
 313
 314         ret = usbhsf_fifo_select(pipe, fifo, 1);
 315         if (ret < 0)
 316                 return 0;
 317
 318         ret = usbhs_pipe_is_accessible(pipe);
 319         if (ret < 0) {
 320                 /* inaccessible pipe is not an error */
 321                 ret = 0;
 322                 goto usbhs_fifo_write_busy;
 323         }
 324
 325         ret = usbhsf_fifo_barrier(priv, fifo);
 326         if (ret < 0)
 327                 goto usbhs_fifo_write_busy;
 328
 329         buf             = pkt->buf    + pkt->actual;
 330         len             = pkt->length - pkt->actual;
 331         len             = min(len, maxp);
 332         total_len       = len;
 333         is_short        = total_len < maxp;
 334
 335         /*
 336          * FIXME
 337          *
 338          * 32-bit access only
 339          */
 340         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 341                 iowrite32_rep(addr, buf, len / 4);
 342                 len %= 4;
 343                 buf += total_len - len;
 344         }
 345
 346         /* the rest operation */
 347         for (i = 0; i < len; i++)
 348                 iowrite8(buf[i], addr + (0x03 - (i & 0x03)));
 349
 350         /*
 351          * variable update
 352          */
 353         pkt->actual += total_len;
 354
 355         if (pkt->actual < pkt->length)
 356                 *is_done = 0;           /* there are remainder data */
 357         else if (is_short)
 358                 *is_done = 1;           /* short packet */
 359         else
 360                 *is_done = !pkt->zero;  /* send zero packet ? */
 361
 362         /*
 363          * pipe/irq handling
 364          */
 365         if (is_short)
 366                 usbhsf_send_terminator(pipe, fifo);
 367
 368         usbhsf_tx_irq_ctrl(pipe, !*is_done);
 369         usbhs_pipe_enable(pipe);
 370
 371         dev_dbg(dev, "  send %d (%d/ %d/ %d/ %d)\n",
 372                 usbhs_pipe_number(pipe),
 373                 pkt->length, pkt->actual, *is_done, pkt->zero);
 374
 375         /*
 376          * Transmission end
 377          */
 378         if (*is_done) {
 379                 if (usbhs_pipe_is_dcp(pipe))
 380                         usbhs_dcp_control_transfer_done(pipe);
 381         }
 382
 383         usbhsf_fifo_unselect(pipe, fifo);
 384
 385         return 0;
 386
 387 usbhs_fifo_write_busy:
 388         usbhsf_fifo_unselect(pipe, fifo);
 389
 390         /*
 391          * pipe is busy.
 392          * retry in interrupt
 393          */
 394         usbhsf_tx_irq_ctrl(pipe, 1);
 395
 396         return ret;
 397 }
 398
 399 struct usbhs_pkt_handle usbhs_fifo_pio_push_handler = {
 400         .prepare = usbhsf_pio_try_push,
 401         .try_run = usbhsf_pio_try_push,
 402 };
 403
 404 /*
 405  *              PIO pop handler
 406  */
 407 static int usbhsf_prepare_pop(struct usbhs_pkt *pkt, int *is_done)
 408 {
 409         struct usbhs_pipe *pipe = pkt->pipe;
 410
 411         if (usbhs_pipe_is_busy(pipe))
 412                 return 0;
 413
 414         /*
 415          * pipe enable to prepare packet receive
 416          */
 417
 418         usbhs_pipe_enable(pipe);
 419         usbhsf_rx_irq_ctrl(pipe, 1);
 420
 421         return 0;
 422 }
 423
 424 static int usbhsf_pio_try_pop(struct usbhs_pkt *pkt, int *is_done)
 425 {
 426         struct usbhs_pipe *pipe = pkt->pipe;
 427         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 428         struct device *dev = usbhs_priv_to_dev(priv);
 429         struct usbhs_fifo *fifo = usbhsf_get_cfifo(priv); /* CFIFO */
 430         void __iomem *addr = priv->base + fifo->port;
 431         u8 *buf;
 432         u32 data = 0;
 433         int maxp = usbhs_pipe_get_maxpacket(pipe);
 434         int rcv_len, len;
 435         int i, ret;
 436         int total_len = 0;
 437
 438         ret = usbhsf_fifo_select(pipe, fifo, 0);
 439         if (ret < 0)
 440                 return 0;
 441
 442         ret = usbhsf_fifo_barrier(priv, fifo);
 443         if (ret < 0)
 444                 goto usbhs_fifo_read_busy;
 445
 446         rcv_len = usbhsf_fifo_rcv_len(priv, fifo);
 447
 448         buf             = pkt->buf    + pkt->actual;
 449         len             = pkt->length - pkt->actual;
 450         len             = min(len, rcv_len);
 451         total_len       = len;
 452
 453         /*
 454          * Buffer clear if Zero-Length packet
 455          *
 456          * see
 457          * "Operation" - "FIFO Buffer Memory" - "FIFO Port Function"
 458          */
 459         if (0 == rcv_len) {
 460                 usbhsf_fifo_clear(pipe, fifo);
 461                 goto usbhs_fifo_read_end;
 462         }
 463
 464         /*
 465          * FIXME
 466          *
 467          * 32-bit access only
 468          */
 469         if (len >= 4 && !((unsigned long)buf & 0x03)) {
 470                 ioread32_rep(addr, buf, len / 4);
 471                 len %= 4;
 472                 buf += total_len - len;
 473         }
 474
 475         /* the rest operation */
 476         for (i = 0; i < len; i++) {
 477                 if (!(i & 0x03))
 478                         data = ioread32(addr);
 479
 480                 buf[i] = (data >> ((i & 0x03) * 8)) & 0xff;
 481         }
 482
 483         pkt->actual += total_len;
 484
 485 usbhs_fifo_read_end:
 486         if ((pkt->actual == pkt->length) ||     /* receive all data */
 487             (total_len < maxp)) {               /* short packet */
 488                 *is_done = 1;
 489                 usbhsf_rx_irq_ctrl(pipe, 0);
 490                 usbhs_pipe_disable(pipe);
 491         }
 492
 493         dev_dbg(dev, "  recv %d (%d/ %d/ %d/ %d)\n",
 494                 usbhs_pipe_number(pipe),
 495                 pkt->length, pkt->actual, *is_done, pkt->zero);
 496
 497 usbhs_fifo_read_busy:
 498         usbhsf_fifo_unselect(pipe, fifo);
 499
 500         return ret;
 501 }
 502
 503 struct usbhs_pkt_handle usbhs_fifo_pio_pop_handler = {
 504         .prepare = usbhsf_prepare_pop,
 505         .try_run = usbhsf_pio_try_pop,
 506 };
 507
 508 /*
 509  *              DCP ctrol statge handler
 510  */
 511 static int usbhsf_ctrl_stage_end(struct usbhs_pkt *pkt, int *is_done)
 512 {
 513         usbhs_dcp_control_transfer_done(pkt->pipe);
 514
 515         *is_done = 1;
 516
 517         return 0;
 518 }
 519
 520 struct usbhs_pkt_handle usbhs_ctrl_stage_end_handler = {
 521         .prepare = usbhsf_ctrl_stage_end,
 522         .try_run = usbhsf_ctrl_stage_end,
 523 };
 524
 525 /*
 526  *              DMA fifo functions
 527  */
 528 static struct dma_chan *usbhsf_dma_chan_get(struct usbhs_fifo *fifo,
 529                                             struct usbhs_pkt *pkt)
 530 {
 531         if (&usbhs_fifo_dma_push_handler == pkt->handler)
 532                 return fifo->tx_chan;
 533
 534         if (&usbhs_fifo_dma_pop_handler == pkt->handler)
 535                 return fifo->rx_chan;
 536
 537         return NULL;
 538 }
 539
 540 static struct usbhs_fifo *usbhsf_get_dma_fifo(struct usbhs_priv *priv,
 541                                               struct usbhs_pkt *pkt)
 542 {
 543         struct usbhs_fifo *fifo;
 544
 545         /* DMA :: D0FIFO */
 546         fifo = usbhsf_get_d0fifo(priv);
 547         if (usbhsf_dma_chan_get(fifo, pkt) &&
 548             !usbhsf_fifo_is_busy(fifo))
 549                 return fifo;
 550
 551         /* DMA :: D1FIFO */
 552         fifo = usbhsf_get_d1fifo(priv);
 553         if (usbhsf_dma_chan_get(fifo, pkt) &&
 554             !usbhsf_fifo_is_busy(fifo))
 555                 return fifo;
 556
 557         return NULL;
 558 }
 559
 560 #define usbhsf_dma_start(p, f)  __usbhsf_dma_ctrl(p, f, DREQE)
 561 #define usbhsf_dma_stop(p, f)   __usbhsf_dma_ctrl(p, f, 0)
 562 static void __usbhsf_dma_ctrl(struct usbhs_pipe *pipe,
 563                               struct usbhs_fifo *fifo,
 564                               u16 dreqe)
 565 {
 566         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 567
 568         usbhs_bset(priv, fifo->sel, DREQE, dreqe);
 569 }
 570
 571 #define usbhsf_dma_map(p)       __usbhsf_dma_map_ctrl(p, 1)
 572 #define usbhsf_dma_unmap(p)     __usbhsf_dma_map_ctrl(p, 0)
 573 static int __usbhsf_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
 574 {
 575         struct usbhs_pipe *pipe = pkt->pipe;
 576         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 577         struct usbhs_pipe_info *info = usbhs_priv_to_pipeinfo(priv);
 578
 579         return info->dma_map_ctrl(pkt, map);
 580 }
 581
 582 static void usbhsf_dma_complete(void *arg);
 583 static void usbhsf_dma_prepare_tasklet(unsigned long data)
 584 {
 585         struct usbhs_pkt *pkt = (struct usbhs_pkt *)data;
 586         struct usbhs_pipe *pipe = pkt->pipe;
 587         struct usbhs_fifo *fifo = usbhs_pipe_to_fifo(pipe);
 588         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 589         struct scatterlist sg;
 590         struct dma_async_tx_descriptor *desc;
 591         struct dma_chan *chan = usbhsf_dma_chan_get(fifo, pkt);
 592         struct device *dev = usbhs_priv_to_dev(priv);
 593         enum dma_data_direction dir;
 594         dma_cookie_t cookie;
 595
 596         dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
 597
 598         sg_init_table(&sg, 1);
 599         sg_set_page(&sg, virt_to_page(pkt->dma),
 600                     pkt->length, offset_in_page(pkt->dma));
 601         sg_dma_address(&sg) = pkt->dma + pkt->actual;
 602         sg_dma_len(&sg) = pkt->trans;
 603
 604         desc = chan->device->device_prep_slave_sg(chan, &sg, 1, dir,
 605                                                   DMA_PREP_INTERRUPT |
 606                                                   DMA_CTRL_ACK);
 607         if (!desc)
 608                 return;
 609
 610         desc->callback          = usbhsf_dma_complete;
 611         desc->callback_param    = pipe;
 612
 613         cookie = desc->tx_submit(desc);
 614         if (cookie < 0) {
 615                 dev_err(dev, "Failed to submit dma descriptor\n");
 616                 return;
 617         }
 618
 619         dev_dbg(dev, "  %s %d (%d/ %d)\n",
 620                 fifo->name, usbhs_pipe_number(pipe), pkt->length, pkt->zero);
 621
 622         usbhsf_dma_start(pipe, fifo);
 623         dma_async_issue_pending(chan);
 624 }
 625
 626 /*
 627  *              DMA push handler
 628  */
 629 static int usbhsf_dma_prepare_push(struct usbhs_pkt *pkt, int *is_done)
 630 {
 631         struct usbhs_pipe *pipe = pkt->pipe;
 632         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 633         struct usbhs_fifo *fifo;
 634         int len = pkt->length - pkt->actual;
 635         int ret;
 636
 637         if (usbhs_pipe_is_busy(pipe))
 638                 return 0;
 639
 640         /* use PIO if packet is less than pio_dma_border or pipe is DCP */
 641         if ((len < usbhs_get_dparam(priv, pio_dma_border)) ||
 642             usbhs_pipe_is_dcp(pipe))
 643                 goto usbhsf_pio_prepare_push;
 644
 645         if (len % 4) /* 32bit alignment */
 646                 goto usbhsf_pio_prepare_push;
 647
 648         if (((u32)pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
 649                 goto usbhsf_pio_prepare_push;
 650
 651         /* get enable DMA fifo */
 652         fifo = usbhsf_get_dma_fifo(priv, pkt);
 653         if (!fifo)
 654                 goto usbhsf_pio_prepare_push;
 655
 656         if (usbhsf_dma_map(pkt) < 0)
 657                 goto usbhsf_pio_prepare_push;
 658
 659         ret = usbhsf_fifo_select(pipe, fifo, 0);
 660         if (ret < 0)
 661                 goto usbhsf_pio_prepare_push_unmap;
 662
 663         pkt->trans = len;
 664
 665         tasklet_init(&fifo->tasklet,
 666                      usbhsf_dma_prepare_tasklet,
 667                      (unsigned long)pkt);
 668
 669         tasklet_schedule(&fifo->tasklet);
 670
 671         return 0;
 672
 673 usbhsf_pio_prepare_push_unmap:
 674         usbhsf_dma_unmap(pkt);
 675 usbhsf_pio_prepare_push:
 676         /*
 677          * change handler to PIO
 678          */
 679         pkt->handler = &usbhs_fifo_pio_push_handler;
 680
 681         return pkt->handler->prepare(pkt, is_done);
 682 }
 683
 684 static int usbhsf_dma_push_done(struct usbhs_pkt *pkt, int *is_done)
 685 {
 686         struct usbhs_pipe *pipe = pkt->pipe;
 687
 688         pkt->actual = pkt->trans;
 689
 690         *is_done = !pkt->zero;  /* send zero packet ? */
 691
 692         usbhsf_dma_stop(pipe, pipe->fifo);
 693         usbhsf_dma_unmap(pkt);
 694         usbhsf_fifo_unselect(pipe, pipe->fifo);
 695
 696         return 0;
 697 }
 698
 699 struct usbhs_pkt_handle usbhs_fifo_dma_push_handler = {
 700         .prepare        = usbhsf_dma_prepare_push,
 701         .dma_done       = usbhsf_dma_push_done,
 702 };
 703
 704 /*
 705  *              DMA pop handler
 706  */
 707 static int usbhsf_dma_try_pop(struct usbhs_pkt *pkt, int *is_done)
 708 {
 709         struct usbhs_pipe *pipe = pkt->pipe;
 710         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 711         struct usbhs_fifo *fifo;
 712         int len, ret;
 713
 714         if (usbhs_pipe_is_busy(pipe))
 715                 return 0;
 716
 717         if (usbhs_pipe_is_dcp(pipe))
 718                 goto usbhsf_pio_prepare_pop;
 719
 720         /* get enable DMA fifo */
 721         fifo = usbhsf_get_dma_fifo(priv, pkt);
 722         if (!fifo)
 723                 goto usbhsf_pio_prepare_pop;
 724
 725         if (((u32)pkt->buf + pkt->actual) & 0x7) /* 8byte alignment */
 726                 goto usbhsf_pio_prepare_pop;
 727
 728         ret = usbhsf_fifo_select(pipe, fifo, 0);
 729         if (ret < 0)
 730                 goto usbhsf_pio_prepare_pop;
 731
 732         /* use PIO if packet is less than pio_dma_border */
 733         len = usbhsf_fifo_rcv_len(priv, fifo);
 734         len = min(pkt->length - pkt->actual, len);
 735         if (len % 4) /* 32bit alignment */
 736                 goto usbhsf_pio_prepare_pop_unselect;
 737
 738         if (len < usbhs_get_dparam(priv, pio_dma_border))
 739                 goto usbhsf_pio_prepare_pop_unselect;
 740
 741         ret = usbhsf_fifo_barrier(priv, fifo);
 742         if (ret < 0)
 743                 goto usbhsf_pio_prepare_pop_unselect;
 744
 745         if (usbhsf_dma_map(pkt) < 0)
 746                 goto usbhsf_pio_prepare_pop_unselect;
 747
 748         /* DMA */
 749
 750         /*
 751          * usbhs_fifo_dma_pop_handler :: prepare
 752          * enabled irq to come here.
 753          * but it is no longer needed for DMA. disable it.
 754          */
 755         usbhsf_rx_irq_ctrl(pipe, 0);
 756
 757         pkt->trans = len;
 758
 759         tasklet_init(&fifo->tasklet,
 760                      usbhsf_dma_prepare_tasklet,
 761                      (unsigned long)pkt);
 762
 763         tasklet_schedule(&fifo->tasklet);
 764
 765         return 0;
 766
 767 usbhsf_pio_prepare_pop_unselect:
 768         usbhsf_fifo_unselect(pipe, fifo);
 769 usbhsf_pio_prepare_pop:
 770
 771         /*
 772          * change handler to PIO
 773          */
 774         pkt->handler = &usbhs_fifo_pio_pop_handler;
 775
 776         return pkt->handler->try_run(pkt, is_done);
 777 }
 778
 779 static int usbhsf_dma_pop_done(struct usbhs_pkt *pkt, int *is_done)
 780 {
 781         struct usbhs_pipe *pipe = pkt->pipe;
 782         int maxp = usbhs_pipe_get_maxpacket(pipe);
 783
 784         usbhsf_dma_stop(pipe, pipe->fifo);
 785         usbhsf_dma_unmap(pkt);
 786         usbhsf_fifo_unselect(pipe, pipe->fifo);
 787
 788         pkt->actual += pkt->trans;
 789
 790         if ((pkt->actual == pkt->length) ||     /* receive all data */
 791             (pkt->trans < maxp)) {              /* short packet */
 792                 *is_done = 1;
 793         } else {
 794                 /* re-enable */
 795                 usbhsf_prepare_pop(pkt, is_done);
 796         }
 797
 798         return 0;
 799 }
 800
 801 struct usbhs_pkt_handle usbhs_fifo_dma_pop_handler = {
 802         .prepare        = usbhsf_prepare_pop,
 803         .try_run        = usbhsf_dma_try_pop,
 804         .dma_done       = usbhsf_dma_pop_done
 805 };
 806
 807 /*
 808  *              DMA setting
 809  */
 810 static bool usbhsf_dma_filter(struct dma_chan *chan, void *param)
 811 {
 812         struct sh_dmae_slave *slave = param;
 813
 814         /*
 815          * FIXME
 816          *
 817          * usbhs doesn't recognize id = 0 as valid DMA
 818          */
 819         if (0 == slave->slave_id)
 820                 return false;
 821
 822         chan->private = slave;
 823
 824         return true;
 825 }
 826
 827 static void usbhsf_dma_quit(struct usbhs_priv *priv, struct usbhs_fifo *fifo)
 828 {
 829         if (fifo->tx_chan)
 830                 dma_release_channel(fifo->tx_chan);
 831         if (fifo->rx_chan)
 832                 dma_release_channel(fifo->rx_chan);
 833
 834         fifo->tx_chan = NULL;
 835         fifo->rx_chan = NULL;
 836 }
 837
 838 static void usbhsf_dma_init(struct usbhs_priv *priv,
 839                             struct usbhs_fifo *fifo)
 840 {
 841         struct device *dev = usbhs_priv_to_dev(priv);
 842         dma_cap_mask_t mask;
 843
 844         dma_cap_zero(mask);
 845         dma_cap_set(DMA_SLAVE, mask);
 846         fifo->tx_chan = dma_request_channel(mask, usbhsf_dma_filter,
 847                                             &fifo->tx_slave);
 848
 849         dma_cap_zero(mask);
 850         dma_cap_set(DMA_SLAVE, mask);
 851         fifo->rx_chan = dma_request_channel(mask, usbhsf_dma_filter,
 852                                             &fifo->rx_slave);
 853
 854         if (fifo->tx_chan || fifo->rx_chan)
 855                 dev_dbg(dev, "enable DMAEngine (%s%s%s)\n",
 856                          fifo->name,
 857                          fifo->tx_chan ? "[TX]" : "    ",
 858                          fifo->rx_chan ? "[RX]" : "    ");
 859 }
 860
 861 /*
 862  *              irq functions
 863  */
 864 static int usbhsf_irq_empty(struct usbhs_priv *priv,
 865                             struct usbhs_irq_state *irq_state)
 866 {
 867         struct usbhs_pipe *pipe;
 868         struct device *dev = usbhs_priv_to_dev(priv);
 869         int i, ret;
 870
 871         if (!irq_state->bempsts) {
 872                 dev_err(dev, "debug %s !!\n", __func__);
 873                 return -EIO;
 874         }
 875
 876         dev_dbg(dev, "irq empty [0x%04x]\n", irq_state->bempsts);
 877
 878         /*
 879          * search interrupted "pipe"
 880          * not "uep".
 881          */
 882         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
 883                 if (!(irq_state->bempsts & (1 << i)))
 884                         continue;
 885
 886                 ret = usbhs_pkt_run(pipe);
 887                 if (ret < 0)
 888                         dev_err(dev, "irq_empty run_error %d : %d\n", i, ret);
 889         }
 890
 891         return 0;
 892 }
 893
 894 static int usbhsf_irq_ready(struct usbhs_priv *priv,
 895                             struct usbhs_irq_state *irq_state)
 896 {
 897         struct usbhs_pipe *pipe;
 898         struct device *dev = usbhs_priv_to_dev(priv);
 899         int i, ret;
 900
 901         if (!irq_state->brdysts) {
 902                 dev_err(dev, "debug %s !!\n", __func__);
 903                 return -EIO;
 904         }
 905
 906         dev_dbg(dev, "irq ready [0x%04x]\n", irq_state->brdysts);
 907
 908         /*
 909          * search interrupted "pipe"
 910          * not "uep".
 911          */
 912         usbhs_for_each_pipe_with_dcp(pipe, priv, i) {
 913                 if (!(irq_state->brdysts & (1 << i)))
 914                         continue;
 915
 916                 ret = usbhs_pkt_run(pipe);
 917                 if (ret < 0)
 918                         dev_err(dev, "irq_ready run_error %d : %d\n", i, ret);
 919         }
 920
 921         return 0;
 922 }
 923
 924 static void usbhsf_dma_complete(void *arg)
 925 {
 926         struct usbhs_pipe *pipe = arg;
 927         struct usbhs_priv *priv = usbhs_pipe_to_priv(pipe);
 928         struct device *dev = usbhs_priv_to_dev(priv);
 929         int ret;
 930
 931         ret = usbhs_pkt_dmadone(pipe);
 932         if (ret < 0)
 933                 dev_err(dev, "dma_complete run_error %d : %d\n",
 934                         usbhs_pipe_number(pipe), ret);
 935 }
 936
 937 /*
 938  *              fifo init
 939  */
 940 void usbhs_fifo_init(struct usbhs_priv *priv)
 941 {
 942         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 943         struct usbhs_fifo *cfifo = usbhsf_get_cfifo(priv);
 944         struct usbhs_fifo *d0fifo = usbhsf_get_d0fifo(priv);
 945         struct usbhs_fifo *d1fifo = usbhsf_get_d1fifo(priv);
 946
 947         mod->irq_empty          = usbhsf_irq_empty;
 948         mod->irq_ready          = usbhsf_irq_ready;
 949         mod->irq_bempsts        = 0;
 950         mod->irq_brdysts        = 0;
 951
 952         cfifo->pipe     = NULL;
 953         cfifo->tx_chan  = NULL;
 954         cfifo->rx_chan  = NULL;
 955
 956         d0fifo->pipe    = NULL;
 957         d0fifo->tx_chan = NULL;
 958         d0fifo->rx_chan = NULL;
 959
 960         d1fifo->pipe    = NULL;
 961         d1fifo->tx_chan = NULL;
 962         d1fifo->rx_chan = NULL;
 963
 964         usbhsf_dma_init(priv, usbhsf_get_d0fifo(priv));
 965         usbhsf_dma_init(priv, usbhsf_get_d1fifo(priv));
 966 }
 967
 968 void usbhs_fifo_quit(struct usbhs_priv *priv)
 969 {
 970         struct usbhs_mod *mod = usbhs_mod_get_current(priv);
 971
 972         mod->irq_empty          = NULL;
 973         mod->irq_ready          = NULL;
 974         mod->irq_bempsts        = 0;
 975         mod->irq_brdysts        = 0;
 976
 977         usbhsf_dma_quit(priv, usbhsf_get_d0fifo(priv));
 978         usbhsf_dma_quit(priv, usbhsf_get_d1fifo(priv));
 979 }
 980
 981 int usbhs_fifo_probe(struct usbhs_priv *priv)
 982 {
 983         struct usbhs_fifo *fifo;
 984
 985         /* CFIFO */
 986         fifo = usbhsf_get_cfifo(priv);
 987         fifo->name      = "CFIFO";
 988         fifo->port      = CFIFO;
 989         fifo->sel       = CFIFOSEL;
 990         fifo->ctr       = CFIFOCTR;
 991
 992         /* D0FIFO */
 993         fifo = usbhsf_get_d0fifo(priv);
 994         fifo->name      = "D0FIFO";
 995         fifo->port      = D0FIFO;
 996         fifo->sel       = D0FIFOSEL;
 997         fifo->ctr       = D0FIFOCTR;
 998         fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d0_tx_id);
 999         fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d0_rx_id);
1000
1001         /* D1FIFO */
1002         fifo = usbhsf_get_d1fifo(priv);
1003         fifo->name      = "D1FIFO";
1004         fifo->port      = D1FIFO;
1005         fifo->sel       = D1FIFOSEL;
1006         fifo->ctr       = D1FIFOCTR;
1007         fifo->tx_slave.slave_id = usbhs_get_dparam(priv, d1_tx_id);
1008         fifo->rx_slave.slave_id = usbhs_get_dparam(priv, d1_rx_id);
1009
1010         return 0;
1011 }
1012
1013 void usbhs_fifo_remove(struct usbhs_priv *priv)
1014 {
1015 }