drivers/usb/gadget/udc/bdc/bdc_ep.c

   1 /*
   2  * bdc_ep.c - BRCM BDC USB3.0 device controller endpoint related functions
   3  *
   4  * Copyright (C) 2014 Broadcom Corporation
   5  *
   6  * Author: Ashwini Pahuja
   7  *
   8  * Based on drivers under drivers/usb/
   9  *
  10  * This program is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License as published by the
  12  * Free Software Foundation; either version 2 of the License, or (at your
  13  * option) any later version.
  14  *
  15  */
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/kernel.h>
  20 #include <linux/delay.h>
  21 #include <linux/dmapool.h>
  22 #include <linux/ioport.h>
  23 #include <linux/sched.h>
  24 #include <linux/slab.h>
  25 #include <linux/errno.h>
  26 #include <linux/init.h>
  27 #include <linux/timer.h>
  28 #include <linux/list.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/moduleparam.h>
  31 #include <linux/device.h>
  32 #include <linux/usb/ch9.h>
  33 #include <linux/usb/gadget.h>
  34 #include <linux/usb/otg.h>
  35 #include <linux/pm.h>
  36 #include <linux/io.h>
  37 #include <linux/irq.h>
  38 #include <asm/unaligned.h>
  39 #include <linux/platform_device.h>
  40 #include <linux/usb/composite.h>
  41
  42 #include "bdc.h"
  43 #include "bdc_ep.h"
  44 #include "bdc_cmd.h"
  45 #include "bdc_dbg.h"
  46
  47 static const char * const ep0_state_string[] =  {
  48         "WAIT_FOR_SETUP",
  49         "WAIT_FOR_DATA_START",
  50         "WAIT_FOR_DATA_XMIT",
  51         "WAIT_FOR_STATUS_START",
  52         "WAIT_FOR_STATUS_XMIT",
  53         "STATUS_PENDING"
  54 };
  55
  56 /* Free the bdl during ep disable */
  57 static void ep_bd_list_free(struct bdc_ep *ep, u32 num_tabs)
  58 {
  59         struct bd_list *bd_list = &ep->bd_list;
  60         struct bdc *bdc = ep->bdc;
  61         struct bd_table *bd_table;
  62         int index;
  63
  64         dev_dbg(bdc->dev, "%s ep:%s num_tabs:%d\n",
  65                                  __func__, ep->name, num_tabs);
  66
  67         if (!bd_list->bd_table_array) {
  68                 dev_dbg(bdc->dev, "%s already freed\n", ep->name);
  69                 return;
  70         }
  71         for (index = 0; index < num_tabs; index++) {
  72                 /*
  73                  * check if the bd_table struct is allocated ?
  74                  * if yes, then check if bd memory has been allocated, then
  75                  * free the dma_pool and also the bd_table struct memory
  76                 */
  77                 bd_table = bd_list->bd_table_array[index];
  78                 dev_dbg(bdc->dev, "bd_table:%p index:%d\n", bd_table, index);
  79                 if (!bd_table) {
  80                         dev_dbg(bdc->dev, "bd_table not allocated\n");
  81                         continue;
  82                 }
  83                 if (!bd_table->start_bd) {
  84                         dev_dbg(bdc->dev, "bd dma pool not allocated\n");
  85                         continue;
  86                 }
  87
  88                 dev_dbg(bdc->dev,
  89                                 "Free dma pool start_bd:%p dma:%llx\n",
  90                                 bd_table->start_bd,
  91                                 (unsigned long long)bd_table->dma);
  92
  93                 dma_pool_free(bdc->bd_table_pool,
  94                                 bd_table->start_bd,
  95                                 bd_table->dma);
  96                 /* Free the bd_table structure */
  97                 kfree(bd_table);
  98         }
  99         /* Free the bd table array */
 100         kfree(ep->bd_list.bd_table_array);
 101 }
 102
 103 /*
 104  * chain the tables, by insteting a chain bd at the end of prev_table, pointing
 105  * to next_table
 106  */
 107 static inline void chain_table(struct bd_table *prev_table,
 108                                         struct bd_table *next_table,
 109                                         u32 bd_p_tab)
 110 {
 111         /* Chain the prev table to next table */
 112         prev_table->start_bd[bd_p_tab-1].offset[0] =
 113                                 cpu_to_le32(lower_32_bits(next_table->dma));
 114
 115         prev_table->start_bd[bd_p_tab-1].offset[1] =
 116                                 cpu_to_le32(upper_32_bits(next_table->dma));
 117
 118         prev_table->start_bd[bd_p_tab-1].offset[2] =
 119                                 0x0;
 120
 121         prev_table->start_bd[bd_p_tab-1].offset[3] =
 122                                 cpu_to_le32(MARK_CHAIN_BD);
 123 }
 124
 125 /* Allocate the bdl for ep, during config ep */
 126 static int ep_bd_list_alloc(struct bdc_ep *ep)
 127 {
 128         struct bd_table *prev_table = NULL;
 129         int index, num_tabs, bd_p_tab;
 130         struct bdc *bdc = ep->bdc;
 131         struct bd_table *bd_table;
 132         dma_addr_t dma;
 133
 134         if (usb_endpoint_xfer_isoc(ep->desc))
 135                 num_tabs = NUM_TABLES_ISOCH;
 136         else
 137                 num_tabs = NUM_TABLES;
 138
 139         bd_p_tab = NUM_BDS_PER_TABLE;
 140         /* if there is only 1 table in bd list then loop chain to self */
 141         dev_dbg(bdc->dev,
 142                 "%s ep:%p num_tabs:%d\n",
 143                 __func__, ep, num_tabs);
 144
 145         /* Allocate memory for table array */
 146         ep->bd_list.bd_table_array = kzalloc(
 147                                         num_tabs * sizeof(struct bd_table *),
 148                                         GFP_ATOMIC);
 149         if (!ep->bd_list.bd_table_array)
 150                 return -ENOMEM;
 151
 152         /* Allocate memory for each table */
 153         for (index = 0; index < num_tabs; index++) {
 154                 /* Allocate memory for bd_table structure */
 155                 bd_table = kzalloc(sizeof(struct bd_table), GFP_ATOMIC);
 156                 if (!bd_table)
 157                         goto fail;
 158
 159                 bd_table->start_bd = dma_pool_alloc(bdc->bd_table_pool,
 160                                                         GFP_ATOMIC,
 161                                                         &dma);
 162                 if (!bd_table->start_bd) {
 163                         kfree(bd_table);
 164                         goto fail;
 165                 }
 166
 167                 bd_table->dma = dma;
 168
 169                 dev_dbg(bdc->dev,
 170                         "index:%d start_bd:%p dma=%08llx prev_table:%p\n",
 171                         index, bd_table->start_bd,
 172                         (unsigned long long)bd_table->dma, prev_table);
 173
 174                 ep->bd_list.bd_table_array[index] = bd_table;
 175                 memset(bd_table->start_bd, 0, bd_p_tab * sizeof(struct bdc_bd));
 176                 if (prev_table)
 177                         chain_table(prev_table, bd_table, bd_p_tab);
 178
 179                 prev_table = bd_table;
 180         }
 181         chain_table(prev_table, ep->bd_list.bd_table_array[0], bd_p_tab);
 182         /* Memory allocation is successful, now init the internal fields */
 183         ep->bd_list.num_tabs = num_tabs;
 184         ep->bd_list.max_bdi  = (num_tabs * bd_p_tab) - 1;
 185         ep->bd_list.num_tabs = num_tabs;
 186         ep->bd_list.num_bds_table = bd_p_tab;
 187         ep->bd_list.eqp_bdi = 0;
 188         ep->bd_list.hwd_bdi = 0;
 189
 190         return 0;
 191 fail:
 192         /* Free the bd_table_array, bd_table struct, bd's */
 193         ep_bd_list_free(ep, num_tabs);
 194
 195         return -ENOMEM;
 196 }
 197
 198 /* returns how many bd's are need for this transfer */
 199 static inline int bd_needed_req(struct bdc_req *req)
 200 {
 201         int bd_needed = 0;
 202         int remaining;
 203
 204         /* 1 bd needed for 0 byte transfer */
 205         if (req->usb_req.length == 0)
 206                 return 1;
 207
 208         /* remaining bytes after tranfering all max BD size BD's */
 209         remaining = req->usb_req.length % BD_MAX_BUFF_SIZE;
 210         if (remaining)
 211                 bd_needed++;
 212
 213         /* How many maximum BUFF size BD's ? */
 214         remaining = req->usb_req.length / BD_MAX_BUFF_SIZE;
 215         bd_needed += remaining;
 216
 217         return bd_needed;
 218 }
 219
 220 /* returns the bd index(bdi) corresponding to bd dma address */
 221 static int bd_add_to_bdi(struct bdc_ep *ep, dma_addr_t bd_dma_addr)
 222 {
 223         struct bd_list *bd_list = &ep->bd_list;
 224         dma_addr_t dma_first_bd, dma_last_bd;
 225         struct bdc *bdc = ep->bdc;
 226         struct bd_table *bd_table;
 227         bool found = false;
 228         int tbi, bdi;
 229
 230         dma_first_bd = dma_last_bd = 0;
 231         dev_dbg(bdc->dev, "%s  %llx\n",
 232                         __func__, (unsigned long long)bd_dma_addr);
 233         /*
 234          * Find in which table this bd_dma_addr belongs?, go through the table
 235          * array and compare addresses of first and last address of bd of each
 236          * table
 237          */
 238         for (tbi = 0; tbi < bd_list->num_tabs; tbi++) {
 239                 bd_table = bd_list->bd_table_array[tbi];
 240                 dma_first_bd = bd_table->dma;
 241                 dma_last_bd = bd_table->dma +
 242                                         (sizeof(struct bdc_bd) *
 243                                         (bd_list->num_bds_table - 1));
 244                 dev_dbg(bdc->dev, "dma_first_bd:%llx dma_last_bd:%llx\n",
 245                                         (unsigned long long)dma_first_bd,
 246                                         (unsigned long long)dma_last_bd);
 247                 if (bd_dma_addr >= dma_first_bd && bd_dma_addr <= dma_last_bd) {
 248                         found = true;
 249                         break;
 250                 }
 251         }
 252         if (unlikely(!found)) {
 253                 dev_err(bdc->dev, "%s FATAL err, bd not found\n", __func__);
 254                 return -EINVAL;
 255         }
 256         /* Now we know the table, find the bdi */
 257         bdi = (bd_dma_addr - dma_first_bd) / sizeof(struct bdc_bd);
 258
 259         /* return the global bdi, to compare with ep eqp_bdi */
 260         return (bdi + (tbi * bd_list->num_bds_table));
 261 }
 262
 263 /* returns the table index(tbi) of the given bdi */
 264 static int bdi_to_tbi(struct bdc_ep *ep, int bdi)
 265 {
 266         int tbi;
 267
 268         tbi = bdi / ep->bd_list.num_bds_table;
 269         dev_vdbg(ep->bdc->dev,
 270                 "bdi:%d num_bds_table:%d tbi:%d\n",
 271                 bdi, ep->bd_list.num_bds_table, tbi);
 272
 273         return tbi;
 274 }
 275
 276 /* Find the bdi last bd in the transfer */
 277 static inline int find_end_bdi(struct bdc_ep *ep, int next_hwd_bdi)
 278 {
 279         int end_bdi;
 280
 281         end_bdi = next_hwd_bdi - 1;
 282         if (end_bdi < 0)
 283                 end_bdi = ep->bd_list.max_bdi - 1;
 284          else if ((end_bdi % (ep->bd_list.num_bds_table-1)) == 0)
 285                 end_bdi--;
 286
 287         return end_bdi;
 288 }
 289
 290 /*
 291  * How many transfer bd's are available on this ep bdl, chain bds are not
 292  * counted in available bds
 293  */
 294 static int bd_available_ep(struct bdc_ep *ep)
 295 {
 296         struct bd_list *bd_list = &ep->bd_list;
 297         int available1, available2;
 298         struct bdc *bdc = ep->bdc;
 299         int chain_bd1, chain_bd2;
 300         int available_bd = 0;
 301
 302         available1 = available2 = chain_bd1 = chain_bd2 = 0;
 303         /* if empty then we have all bd's available - number of chain bd's */
 304         if (bd_list->eqp_bdi == bd_list->hwd_bdi)
 305                 return bd_list->max_bdi - bd_list->num_tabs;
 306
 307         /*
 308          * Depending upon where eqp and dqp pointers are, caculate number
 309          * of avaialble bd's
 310          */
 311         if (bd_list->hwd_bdi < bd_list->eqp_bdi) {
 312                 /* available bd's are from eqp..max_bds + 0..dqp - chain_bds */
 313                 available1 = bd_list->max_bdi - bd_list->eqp_bdi;
 314                 available2 = bd_list->hwd_bdi;
 315                 chain_bd1 = available1 / bd_list->num_bds_table;
 316                 chain_bd2 = available2 / bd_list->num_bds_table;
 317                 dev_vdbg(bdc->dev, "chain_bd1:%d chain_bd2:%d\n",
 318                                                 chain_bd1, chain_bd2);
 319                 available_bd = available1 + available2 - chain_bd1 - chain_bd2;
 320         } else {
 321                 /* available bd's are from eqp..dqp - number of chain bd's */
 322                 available1 = bd_list->hwd_bdi -  bd_list->eqp_bdi;
 323                 /* if gap between eqp and dqp is less than NUM_BDS_PER_TABLE */
 324                 if ((bd_list->hwd_bdi - bd_list->eqp_bdi)
 325                                         <= bd_list->num_bds_table) {
 326                         /* If there any chain bd in between */
 327                         if (!(bdi_to_tbi(ep, bd_list->hwd_bdi)
 328                                         == bdi_to_tbi(ep, bd_list->eqp_bdi))) {
 329                                 available_bd = available1 - 1;
 330                         }
 331                 } else {
 332                         chain_bd1 = available1 / bd_list->num_bds_table;
 333                         available_bd = available1 - chain_bd1;
 334                 }
 335         }
 336         /*
 337          * we need to keep one extra bd to check if ring is full or empty so
 338          * reduce by 1
 339          */
 340         available_bd--;
 341         dev_vdbg(bdc->dev, "available_bd:%d\n", available_bd);
 342
 343         return available_bd;
 344 }
 345
 346 /* Notify the hardware after queueing the bd to bdl */
 347 void bdc_notify_xfr(struct bdc *bdc, u32 epnum)
 348 {
 349         struct bdc_ep *ep = bdc->bdc_ep_array[epnum];
 350
 351         dev_vdbg(bdc->dev, "%s epnum:%d\n", __func__, epnum);
 352         /*
 353          * We don't have anyway to check if ep state is running,
 354          * except the software flags.
 355          */
 356         if (unlikely(ep->flags & BDC_EP_STOP))
 357                 ep->flags &= ~BDC_EP_STOP;
 358
 359         bdc_writel(bdc->regs, BDC_XSFNTF, epnum);
 360 }
 361
 362 /* returns the bd corresponding to bdi */
 363 static struct bdc_bd *bdi_to_bd(struct bdc_ep *ep, int bdi)
 364 {
 365         int tbi = bdi_to_tbi(ep, bdi);
 366         int local_bdi = 0;
 367
 368         local_bdi = bdi - (tbi * ep->bd_list.num_bds_table);
 369         dev_vdbg(ep->bdc->dev,
 370                 "%s bdi:%d local_bdi:%d\n",
 371                  __func__, bdi, local_bdi);
 372
 373         return (ep->bd_list.bd_table_array[tbi]->start_bd + local_bdi);
 374 }
 375
 376 /* Advance the enqueue pointer */
 377 static void ep_bdlist_eqp_adv(struct bdc_ep *ep)
 378 {
 379         ep->bd_list.eqp_bdi++;
 380         /* if it's chain bd, then move to next */
 381         if (((ep->bd_list.eqp_bdi + 1) % ep->bd_list.num_bds_table) == 0)
 382                 ep->bd_list.eqp_bdi++;
 383
 384         /* if the eqp is pointing to last + 1 then move back to 0 */
 385         if (ep->bd_list.eqp_bdi == (ep->bd_list.max_bdi + 1))
 386                 ep->bd_list.eqp_bdi = 0;
 387 }
 388
 389 /* Setup the first bd for ep0 transfer */
 390 static int setup_first_bd_ep0(struct bdc *bdc, struct bdc_req *req, u32 *dword3)
 391 {
 392         u16 wValue;
 393         u32 req_len;
 394
 395         req->ep->dir = 0;
 396         req_len = req->usb_req.length;
 397         switch (bdc->ep0_state) {
 398         case WAIT_FOR_DATA_START:
 399                 *dword3 |= BD_TYPE_DS;
 400                 if (bdc->setup_pkt.bRequestType & USB_DIR_IN)
 401                         *dword3 |= BD_DIR_IN;
 402
 403                 /* check if zlp will be needed */
 404                 wValue = le16_to_cpu(bdc->setup_pkt.wValue);
 405                 if ((wValue > req_len) &&
 406                                 (req_len % bdc->gadget.ep0->maxpacket == 0)) {
 407                         dev_dbg(bdc->dev, "ZLP needed wVal:%d len:%d MaxP:%d\n",
 408                                         wValue, req_len,
 409                                         bdc->gadget.ep0->maxpacket);
 410                         bdc->zlp_needed = true;
 411                 }
 412                 break;
 413
 414         case WAIT_FOR_STATUS_START:
 415                 *dword3 |= BD_TYPE_SS;
 416                 if (!le16_to_cpu(bdc->setup_pkt.wLength) ||
 417                                 !(bdc->setup_pkt.bRequestType & USB_DIR_IN))
 418                         *dword3 |= BD_DIR_IN;
 419                 break;
 420         default:
 421                 dev_err(bdc->dev,
 422                         "Unknown ep0 state for queueing bd ep0_state:%s\n",
 423                         ep0_state_string[bdc->ep0_state]);
 424                 return -EINVAL;
 425         }
 426
 427         return 0;
 428 }
 429
 430 /* Setup the bd dma descriptor for a given request */
 431 static int setup_bd_list_xfr(struct bdc *bdc, struct bdc_req *req, int num_bds)
 432 {
 433         dma_addr_t buf_add = req->usb_req.dma;
 434         u32 maxp, tfs, dword2, dword3;
 435         struct bd_transfer *bd_xfr;
 436         struct bd_list *bd_list;
 437         struct bdc_ep *ep;
 438         struct bdc_bd *bd;
 439         int ret, bdnum;
 440         u32 req_len;
 441
 442         ep = req->ep;
 443         bd_list = &ep->bd_list;
 444         bd_xfr = &req->bd_xfr;
 445         bd_xfr->req = req;
 446         bd_xfr->start_bdi = bd_list->eqp_bdi;
 447         bd = bdi_to_bd(ep, bd_list->eqp_bdi);
 448         req_len = req->usb_req.length;
 449         maxp = usb_endpoint_maxp(ep->desc) & 0x7ff;
 450         tfs = roundup(req->usb_req.length, maxp);
 451         tfs = tfs/maxp;
 452         dev_vdbg(bdc->dev, "%s ep:%s num_bds:%d tfs:%d r_len:%d bd:%p\n",
 453                                 __func__, ep->name, num_bds, tfs, req_len, bd);
 454
 455         for (bdnum = 0; bdnum < num_bds; bdnum++) {
 456                 dword2 = dword3 = 0;
 457                 /* First bd */
 458                 if (!bdnum) {
 459                         dword3 |= BD_SOT|BD_SBF|(tfs<<BD_TFS_SHIFT);
 460                         dword2 |= BD_LTF;
 461                         /* format of first bd for ep0 is different than other */
 462                         if (ep->ep_num == 1) {
 463                                 ret = setup_first_bd_ep0(bdc, req, &dword3);
 464                                 if (ret)
 465                                         return ret;
 466                         }
 467                 }
 468                 if (!req->ep->dir)
 469                         dword3 |= BD_ISP;
 470
 471                 if (req_len > BD_MAX_BUFF_SIZE) {
 472                         dword2 |= BD_MAX_BUFF_SIZE;
 473                         req_len -= BD_MAX_BUFF_SIZE;
 474                 } else {
 475                         /* this should be the last bd */
 476                         dword2 |= req_len;
 477                         dword3 |= BD_IOC;
 478                         dword3 |= BD_EOT;
 479                 }
 480                 /* Currently only 1 INT target is supported */
 481                 dword2 |= BD_INTR_TARGET(0);
 482                 bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
 483                 if (unlikely(!bd)) {
 484                         dev_err(bdc->dev, "Err bd pointing to wrong addr\n");
 485                         return -EINVAL;
 486                 }
 487                 /* write bd */
 488                 bd->offset[0] = cpu_to_le32(lower_32_bits(buf_add));
 489                 bd->offset[1] = cpu_to_le32(upper_32_bits(buf_add));
 490                 bd->offset[2] = cpu_to_le32(dword2);
 491                 bd->offset[3] = cpu_to_le32(dword3);
 492                 /* advance eqp pointer */
 493                 ep_bdlist_eqp_adv(ep);
 494                 /* advance the buff pointer */
 495                 buf_add += BD_MAX_BUFF_SIZE;
 496                 dev_vdbg(bdc->dev, "buf_add:%08llx req_len:%d bd:%p eqp:%d\n",
 497                                 (unsigned long long)buf_add, req_len, bd,
 498                                                         ep->bd_list.eqp_bdi);
 499                 bd = bdi_to_bd(ep, ep->bd_list.eqp_bdi);
 500                 bd->offset[3] = cpu_to_le32(BD_SBF);
 501         }
 502         /* clear the STOP BD fetch bit from the first bd of this xfr */
 503         bd = bdi_to_bd(ep, bd_xfr->start_bdi);
 504         bd->offset[3] &= cpu_to_le32(~BD_SBF);
 505         /* the new eqp will be next hw dqp */
 506         bd_xfr->num_bds  = num_bds;
 507         bd_xfr->next_hwd_bdi = ep->bd_list.eqp_bdi;
 508         /* everything is written correctly before notifying the HW */
 509         wmb();
 510
 511         return 0;
 512 }
 513
 514 /* Queue the xfr */
 515 static int bdc_queue_xfr(struct bdc *bdc, struct bdc_req *req)
 516 {
 517         int num_bds, bd_available;
 518         struct bdc_ep *ep;
 519         int ret;
 520
 521         ep = req->ep;
 522         dev_dbg(bdc->dev, "%s req:%p\n", __func__, req);
 523         dev_dbg(bdc->dev, "eqp_bdi:%d hwd_bdi:%d\n",
 524                         ep->bd_list.eqp_bdi, ep->bd_list.hwd_bdi);
 525
 526         num_bds =  bd_needed_req(req);
 527         bd_available = bd_available_ep(ep);
 528
 529         /* how many bd's are avaialble on ep */
 530         if (num_bds > bd_available)
 531                 return -ENOMEM;
 532
 533         ret = setup_bd_list_xfr(bdc, req, num_bds);
 534         if (ret)
 535                 return ret;
 536         list_add_tail(&req->queue, &ep->queue);
 537         bdc_dbg_bd_list(bdc, ep);
 538         bdc_notify_xfr(bdc, ep->ep_num);
 539
 540         return 0;
 541 }
 542
 543 /* callback to gadget layer when xfr completes */
 544 static void bdc_req_complete(struct bdc_ep *ep, struct bdc_req *req,
 545                                                 int status)
 546 {
 547         struct bdc *bdc = ep->bdc;
 548
 549         if (req == NULL  || &req->queue == NULL || &req->usb_req == NULL)
 550                 return;
 551
 552         dev_dbg(bdc->dev, "%s ep:%s status:%d\n", __func__, ep->name, status);
 553         list_del(&req->queue);
 554         req->usb_req.status = status;
 555         usb_gadget_unmap_request(&bdc->gadget, &req->usb_req, ep->dir);
 556         if (req->usb_req.complete) {
 557                 spin_unlock(&bdc->lock);
 558                 usb_gadget_giveback_request(&ep->usb_ep, &req->usb_req);
 559                 spin_lock(&bdc->lock);
 560         }
 561 }
 562
 563 /* Disable the endpoint */
 564 int bdc_ep_disable(struct bdc_ep *ep)
 565 {
 566         struct bdc_req *req;
 567         struct bdc *bdc;
 568         int ret;
 569
 570         ret = 0;
 571         bdc = ep->bdc;
 572         dev_dbg(bdc->dev, "%s() ep->ep_num=%d\n", __func__, ep->ep_num);
 573         /* Stop the endpoint */
 574         ret = bdc_stop_ep(bdc, ep->ep_num);
 575
 576         /*
 577          * Intentionally don't check the ret value of stop, it can fail in
 578          * disconnect scenarios, continue with dconfig
 579          */
 580         /* de-queue any pending requests */
 581         while (!list_empty(&ep->queue)) {
 582                 req = list_entry(ep->queue.next, struct bdc_req,
 583                                 queue);
 584                 bdc_req_complete(ep, req, -ESHUTDOWN);
 585         }
 586         /* deconfigure the endpoint */
 587         ret = bdc_dconfig_ep(bdc, ep);
 588         if (ret)
 589                 dev_warn(bdc->dev,
 590                         "dconfig fail but continue with memory free");
 591
 592         ep->flags = 0;
 593         /* ep0 memory is not freed, but reused on next connect sr */
 594         if (ep->ep_num == 1)
 595                 return 0;
 596
 597         /* Free the bdl memory */
 598         ep_bd_list_free(ep, ep->bd_list.num_tabs);
 599         ep->desc = NULL;
 600         ep->comp_desc = NULL;
 601         ep->usb_ep.desc = NULL;
 602         ep->ep_type = 0;
 603
 604         return ret;
 605 }
 606
 607 /* Enable the ep */
 608 int bdc_ep_enable(struct bdc_ep *ep)
 609 {
 610         struct bdc *bdc;
 611         int ret = 0;
 612
 613         bdc = ep->bdc;
 614         dev_dbg(bdc->dev, "%s NUM_TABLES:%d %d\n",
 615                                         __func__, NUM_TABLES, NUM_TABLES_ISOCH);
 616
 617         ret = ep_bd_list_alloc(ep);
 618         if (ret) {
 619                 dev_err(bdc->dev, "ep bd list allocation failed:%d\n", ret);
 620                 return -ENOMEM;
 621         }
 622         bdc_dbg_bd_list(bdc, ep);
 623         /* only for ep0: config ep is called for ep0 from connect event */
 624         ep->flags |= BDC_EP_ENABLED;
 625         if (ep->ep_num == 1)
 626                 return ret;
 627
 628         /* Issue a configure endpoint command */
 629         ret = bdc_config_ep(bdc, ep);
 630         if (ret)
 631                 return ret;
 632
 633         ep->usb_ep.maxpacket = usb_endpoint_maxp(ep->desc);
 634         ep->usb_ep.desc = ep->desc;
 635         ep->usb_ep.comp_desc = ep->comp_desc;
 636         ep->ep_type = usb_endpoint_type(ep->desc);
 637         ep->flags |= BDC_EP_ENABLED;
 638
 639         return 0;
 640 }
 641
 642 /* EP0 related code */
 643
 644 /* Queue a status stage BD */
 645 static int ep0_queue_status_stage(struct bdc *bdc)
 646 {
 647         struct bdc_req *status_req;
 648         struct bdc_ep *ep;
 649
 650         status_req = &bdc->status_req;
 651         ep = bdc->bdc_ep_array[1];
 652         status_req->ep = ep;
 653         status_req->usb_req.length = 0;
 654         status_req->usb_req.status = -EINPROGRESS;
 655         status_req->usb_req.actual = 0;
 656         status_req->usb_req.complete = NULL;
 657         bdc_queue_xfr(bdc, status_req);
 658
 659         return 0;
 660 }
 661
 662 /* Queue xfr on ep0 */
 663 static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req)
 664 {
 665         struct bdc *bdc;
 666         int ret;
 667
 668         bdc = ep->bdc;
 669         dev_dbg(bdc->dev, "%s()\n", __func__);
 670         req->usb_req.actual = 0;
 671         req->usb_req.status = -EINPROGRESS;
 672         req->epnum = ep->ep_num;
 673
 674         if (bdc->delayed_status) {
 675                 bdc->delayed_status = false;
 676                 /* if status stage was delayed? */
 677                 if (bdc->ep0_state == WAIT_FOR_STATUS_START) {
 678                         /* Queue a status stage BD */
 679                         ep0_queue_status_stage(bdc);
 680                         bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
 681                         return 0;
 682                 }
 683         } else {
 684                 /*
 685                  * if delayed status is false and 0 length transfer is requested
 686                  * i.e. for status stage of some setup request, then just
 687                  * return from here the status stage is queued independently
 688                  */
 689                 if (req->usb_req.length == 0)
 690                         return 0;
 691
 692         }
 693         ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
 694         if (ret) {
 695                 dev_err(bdc->dev, "dma mapping failed %s\n", ep->name);
 696                 return ret;
 697         }
 698
 699         return bdc_queue_xfr(bdc, req);
 700 }
 701
 702 /* Queue data stage */
 703 static int ep0_queue_data_stage(struct bdc *bdc)
 704 {
 705         struct bdc_ep *ep;
 706
 707         dev_dbg(bdc->dev, "%s\n", __func__);
 708         ep = bdc->bdc_ep_array[1];
 709         bdc->ep0_req.ep = ep;
 710         bdc->ep0_req.usb_req.complete = NULL;
 711
 712         return ep0_queue(ep, &bdc->ep0_req);
 713 }
 714
 715 /* Queue req on ep */
 716 static int ep_queue(struct bdc_ep *ep, struct bdc_req *req)
 717 {
 718         struct bdc *bdc;
 719         int ret = 0;
 720
 721         if (!req || !ep->usb_ep.desc)
 722                 return -EINVAL;
 723
 724         bdc = ep->bdc;
 725
 726         req->usb_req.actual = 0;
 727         req->usb_req.status = -EINPROGRESS;
 728         req->epnum = ep->ep_num;
 729
 730         ret = usb_gadget_map_request(&bdc->gadget, &req->usb_req, ep->dir);
 731         if (ret) {
 732                 dev_err(bdc->dev, "dma mapping failed\n");
 733                 return ret;
 734         }
 735
 736         return bdc_queue_xfr(bdc, req);
 737 }
 738
 739 /* Dequeue a request from ep */
 740 static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
 741 {
 742         int start_bdi, end_bdi, tbi, eqp_bdi, curr_hw_dqpi;
 743         bool start_pending, end_pending;
 744         bool first_remove = false;
 745         struct bdc_req *first_req;
 746         struct bdc_bd *bd_start;
 747         struct bd_table *table;
 748         dma_addr_t next_bd_dma;
 749         u64   deq_ptr_64 = 0;
 750         struct bdc  *bdc;
 751         u32    tmp_32;
 752         int ret;
 753
 754         bdc = ep->bdc;
 755         start_pending = end_pending = false;
 756         eqp_bdi = ep->bd_list.eqp_bdi - 1;
 757
 758         if (eqp_bdi < 0)
 759                 eqp_bdi = ep->bd_list.max_bdi;
 760
 761         start_bdi = req->bd_xfr.start_bdi;
 762         end_bdi = find_end_bdi(ep, req->bd_xfr.next_hwd_bdi);
 763
 764         dev_dbg(bdc->dev, "%s ep:%s start:%d end:%d\n",
 765                                         __func__, ep->name, start_bdi, end_bdi);
 766         dev_dbg(bdc->dev, "ep_dequeue ep=%p ep->desc=%p\n",
 767                                                 ep, (void *)ep->usb_ep.desc);
 768         /* Stop the ep to see where the HW is ? */
 769         ret = bdc_stop_ep(bdc, ep->ep_num);
 770         /* if there is an issue with stopping ep, then no need to go further */
 771         if (ret)
 772                 return 0;
 773
 774         /*
 775          * After endpoint is stopped, there can be 3 cases, the request
 776          * is processed, pending or in the middle of processing
 777          */
 778
 779         /* The current hw dequeue pointer */
 780         tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0(0));
 781         deq_ptr_64 = tmp_32;
 782         tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS1(0));
 783         deq_ptr_64 |= ((u64)tmp_32 << 32);
 784
 785         /* we have the dma addr of next bd that will be fetched by hardware */
 786         curr_hw_dqpi = bd_add_to_bdi(ep, deq_ptr_64);
 787         if (curr_hw_dqpi < 0)
 788                 return curr_hw_dqpi;
 789
 790         /*
 791          * curr_hw_dqpi points to actual dqp of HW and HW owns bd's from
 792          * curr_hw_dqbdi..eqp_bdi.
 793          */
 794
 795         /* Check if start_bdi and end_bdi are in range of HW owned BD's */
 796         if (curr_hw_dqpi > eqp_bdi) {
 797                 /* there is a wrap from last to 0 */
 798                 if (start_bdi >= curr_hw_dqpi || start_bdi <= eqp_bdi) {
 799                         start_pending = true;
 800                         end_pending = true;
 801                 } else if (end_bdi >= curr_hw_dqpi || end_bdi <= eqp_bdi) {
 802                                 end_pending = true;
 803                 }
 804         } else {
 805                 if (start_bdi >= curr_hw_dqpi) {
 806                         start_pending = true;
 807                         end_pending = true;
 808                 } else if (end_bdi >= curr_hw_dqpi) {
 809                         end_pending = true;
 810                 }
 811         }
 812         dev_dbg(bdc->dev,
 813                 "start_pending:%d end_pending:%d speed:%d\n",
 814                 start_pending, end_pending, bdc->gadget.speed);
 815
 816         /* If both start till end are processes, we cannot deq req */
 817         if (!start_pending && !end_pending)
 818                 return -EINVAL;
 819
 820         /*
 821          * if ep_dequeue is called after disconnect then just return
 822          * success from here
 823          */
 824         if (bdc->gadget.speed == USB_SPEED_UNKNOWN)
 825                 return 0;
 826         tbi = bdi_to_tbi(ep, req->bd_xfr.next_hwd_bdi);
 827         table = ep->bd_list.bd_table_array[tbi];
 828         next_bd_dma =  table->dma +
 829                         sizeof(struct bdc_bd)*(req->bd_xfr.next_hwd_bdi -
 830                                         tbi * ep->bd_list.num_bds_table);
 831
 832         first_req = list_first_entry(&ep->queue, struct bdc_req,
 833                         queue);
 834
 835         if (req == first_req)
 836                 first_remove = true;
 837
 838         /*
 839          * Due to HW limitation we need to bypadd chain bd's and issue ep_bla,
 840          * incase if start is pending this is the first request in the list
 841          * then issue ep_bla instead of marking as chain bd
 842          */
 843         if (start_pending && !first_remove) {
 844                 /*
 845                  * Mark the start bd as Chain bd, and point the chain
 846                  * bd to next_bd_dma
 847                  */
 848                 bd_start = bdi_to_bd(ep, start_bdi);
 849                 bd_start->offset[0] = cpu_to_le32(lower_32_bits(next_bd_dma));
 850                 bd_start->offset[1] = cpu_to_le32(upper_32_bits(next_bd_dma));
 851                 bd_start->offset[2] = 0x0;
 852                 bd_start->offset[3] = cpu_to_le32(MARK_CHAIN_BD);
 853                 bdc_dbg_bd_list(bdc, ep);
 854         } else if (end_pending) {
 855                 /*
 856                  * The transfer is stopped in the middle, move the
 857                  * HW deq pointer to next_bd_dma
 858                  */
 859                 ret = bdc_ep_bla(bdc, ep, next_bd_dma);
 860                 if (ret) {
 861                         dev_err(bdc->dev, "error in ep_bla:%d\n", ret);
 862                         return ret;
 863                 }
 864         }
 865
 866         return 0;
 867 }
 868
 869 /* Halt/Clear the ep based on value */
 870 static int ep_set_halt(struct bdc_ep *ep, u32 value)
 871 {
 872         struct bdc *bdc;
 873         int ret;
 874
 875         bdc = ep->bdc;
 876         dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
 877
 878         if (value) {
 879                 dev_dbg(bdc->dev, "Halt\n");
 880                 if (ep->ep_num == 1)
 881                         bdc->ep0_state = WAIT_FOR_SETUP;
 882
 883                 ret = bdc_ep_set_stall(bdc, ep->ep_num);
 884                 if (ret)
 885                         dev_err(bdc->dev, "failed to set STALL on %s\n",
 886                                 ep->name);
 887                 else
 888                         ep->flags |= BDC_EP_STALL;
 889         } else {
 890                 /* Clear */
 891                 dev_dbg(bdc->dev, "Before Clear\n");
 892                 ret = bdc_ep_clear_stall(bdc, ep->ep_num);
 893                 if (ret)
 894                         dev_err(bdc->dev, "failed to clear STALL on %s\n",
 895                                 ep->name);
 896                 else
 897                         ep->flags &= ~BDC_EP_STALL;
 898                 dev_dbg(bdc->dev, "After  Clear\n");
 899         }
 900
 901         return ret;
 902 }
 903
 904 /* Free all the ep */
 905 void bdc_free_ep(struct bdc *bdc)
 906 {
 907         struct bdc_ep *ep;
 908         u8      epnum;
 909
 910         dev_dbg(bdc->dev, "%s\n", __func__);
 911         for (epnum = 1; epnum < bdc->num_eps; epnum++) {
 912                 ep = bdc->bdc_ep_array[epnum];
 913                 if (!ep)
 914                         continue;
 915
 916                 if (ep->flags & BDC_EP_ENABLED)
 917                         ep_bd_list_free(ep, ep->bd_list.num_tabs);
 918
 919                 /* ep0 is not in this gadget list */
 920                 if (epnum != 1)
 921                         list_del(&ep->usb_ep.ep_list);
 922
 923                 kfree(ep);
 924         }
 925 }
 926
 927 /* USB2 spec, section 7.1.20 */
 928 static int bdc_set_test_mode(struct bdc *bdc)
 929 {
 930         u32 usb2_pm;
 931
 932         usb2_pm = bdc_readl(bdc->regs, BDC_USPPM2);
 933         usb2_pm &= ~BDC_PTC_MASK;
 934         dev_dbg(bdc->dev, "%s\n", __func__);
 935         switch (bdc->test_mode) {
 936         case TEST_J:
 937         case TEST_K:
 938         case TEST_SE0_NAK:
 939         case TEST_PACKET:
 940         case TEST_FORCE_EN:
 941                 usb2_pm |= bdc->test_mode << 28;
 942                 break;
 943         default:
 944                 return -EINVAL;
 945         }
 946         dev_dbg(bdc->dev, "usb2_pm=%08x", usb2_pm);
 947         bdc_writel(bdc->regs, BDC_USPPM2, usb2_pm);
 948
 949         return 0;
 950 }
 951
 952 /*
 953  * Helper function to handle Transfer status report with status as either
 954  * success or short
 955  */
 956 static void handle_xsr_succ_status(struct bdc *bdc, struct bdc_ep *ep,
 957                                                         struct bdc_sr *sreport)
 958 {
 959         int short_bdi, start_bdi, end_bdi, max_len_bds, chain_bds;
 960         struct bd_list *bd_list = &ep->bd_list;
 961         int actual_length, length_short;
 962         struct bd_transfer *bd_xfr;
 963         struct bdc_bd *short_bd;
 964         struct bdc_req *req;
 965         u64   deq_ptr_64 = 0;
 966         int status = 0;
 967         int sr_status;
 968         u32    tmp_32;
 969
 970         dev_dbg(bdc->dev, "%s  ep:%p\n", __func__, ep);
 971         bdc_dbg_srr(bdc, 0);
 972         /* do not process thie sr if ignore flag is set */
 973         if (ep->ignore_next_sr) {
 974                 ep->ignore_next_sr = false;
 975                 return;
 976         }
 977
 978         if (unlikely(list_empty(&ep->queue))) {
 979                 dev_warn(bdc->dev, "xfr srr with no BD's queued\n");
 980                 return;
 981         }
 982         req = list_entry(ep->queue.next, struct bdc_req,
 983                         queue);
 984
 985         bd_xfr = &req->bd_xfr;
 986         sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
 987
 988         /*
 989          * sr_status is short and this transfer has more than 1 bd then it needs
 990          * special handling,  this is only applicable for bulk and ctrl
 991          */
 992         if (sr_status == XSF_SHORT &&  bd_xfr->num_bds > 1) {
 993                 /*
 994                  * This is multi bd xfr, lets see which bd
 995                  * caused short transfer and how many bytes have been
 996                  * transferred so far.
 997                  */
 998                 tmp_32 = le32_to_cpu(sreport->offset[0]);
 999                 deq_ptr_64 = tmp_32;
1000                 tmp_32 = le32_to_cpu(sreport->offset[1]);
1001                 deq_ptr_64 |= ((u64)tmp_32 << 32);
1002                 short_bdi = bd_add_to_bdi(ep, deq_ptr_64);
1003                 if (unlikely(short_bdi < 0))
1004                         dev_warn(bdc->dev, "bd doesn't exist?\n");
1005
1006                 start_bdi =  bd_xfr->start_bdi;
1007                 /*
1008                  * We know the start_bdi and short_bdi, how many xfr
1009                  * bds in between
1010                  */
1011                 if (start_bdi <= short_bdi) {
1012                         max_len_bds = short_bdi - start_bdi;
1013                         if (max_len_bds <= bd_list->num_bds_table) {
1014                                 if (!(bdi_to_tbi(ep, start_bdi) ==
1015                                                 bdi_to_tbi(ep, short_bdi)))
1016                                         max_len_bds--;
1017                         } else {
1018                                 chain_bds = max_len_bds/bd_list->num_bds_table;
1019                                 max_len_bds -= chain_bds;
1020                         }
1021                 } else {
1022                         /* there is a wrap in the ring within a xfr */
1023                         chain_bds = (bd_list->max_bdi - start_bdi)/
1024                                                         bd_list->num_bds_table;
1025                         chain_bds += short_bdi/bd_list->num_bds_table;
1026                         max_len_bds = bd_list->max_bdi - start_bdi;
1027                         max_len_bds += short_bdi;
1028                         max_len_bds -= chain_bds;
1029                 }
1030                 /* max_len_bds is the number of full length bds */
1031                 end_bdi = find_end_bdi(ep, bd_xfr->next_hwd_bdi);
1032                 if (!(end_bdi == short_bdi))
1033                         ep->ignore_next_sr = true;
1034
1035                 actual_length = max_len_bds * BD_MAX_BUFF_SIZE;
1036                 short_bd = bdi_to_bd(ep, short_bdi);
1037                 /* length queued */
1038                 length_short = le32_to_cpu(short_bd->offset[2]) & 0x1FFFFF;
1039                 /* actual length trensfered */
1040                 length_short -= SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1041                 actual_length += length_short;
1042                 req->usb_req.actual = actual_length;
1043         } else {
1044                 req->usb_req.actual = req->usb_req.length -
1045                         SR_BD_LEN(le32_to_cpu(sreport->offset[2]));
1046                 dev_dbg(bdc->dev,
1047                         "len=%d actual=%d bd_xfr->next_hwd_bdi:%d\n",
1048                         req->usb_req.length, req->usb_req.actual,
1049                         bd_xfr->next_hwd_bdi);
1050         }
1051
1052         /* Update the dequeue pointer */
1053         ep->bd_list.hwd_bdi = bd_xfr->next_hwd_bdi;
1054         if (req->usb_req.actual < req->usb_req.length) {
1055                 dev_dbg(bdc->dev, "short xfr on %d\n", ep->ep_num);
1056                 if (req->usb_req.short_not_ok)
1057                         status = -EREMOTEIO;
1058         }
1059         bdc_req_complete(ep, bd_xfr->req, status);
1060 }
1061
1062 /* EP0 setup related packet handlers */
1063
1064 /*
1065  * Setup packet received, just store the packet and process on next DS or SS
1066  * started SR
1067  */
1068 void bdc_xsf_ep0_setup_recv(struct bdc *bdc, struct bdc_sr *sreport)
1069 {
1070         struct usb_ctrlrequest *setup_pkt;
1071         u32 len;
1072
1073         dev_dbg(bdc->dev,
1074                 "%s ep0_state:%s\n",
1075                 __func__, ep0_state_string[bdc->ep0_state]);
1076         /* Store received setup packet */
1077         setup_pkt = &bdc->setup_pkt;
1078         memcpy(setup_pkt, &sreport->offset[0], sizeof(*setup_pkt));
1079         len = le16_to_cpu(setup_pkt->wLength);
1080         if (!len)
1081                 bdc->ep0_state = WAIT_FOR_STATUS_START;
1082         else
1083                 bdc->ep0_state = WAIT_FOR_DATA_START;
1084
1085
1086         dev_dbg(bdc->dev,
1087                 "%s exit ep0_state:%s\n",
1088                 __func__, ep0_state_string[bdc->ep0_state]);
1089 }
1090
1091 /* Stall ep0 */
1092 static void ep0_stall(struct bdc *bdc)
1093 {
1094         struct bdc_ep   *ep = bdc->bdc_ep_array[1];
1095         struct bdc_req *req;
1096
1097         dev_dbg(bdc->dev, "%s\n", __func__);
1098         bdc->delayed_status = false;
1099         ep_set_halt(ep, 1);
1100
1101         /* de-queue any pendig requests */
1102         while (!list_empty(&ep->queue)) {
1103                 req = list_entry(ep->queue.next, struct bdc_req,
1104                                 queue);
1105                 bdc_req_complete(ep, req, -ESHUTDOWN);
1106         }
1107 }
1108
1109 /* SET_ADD handlers */
1110 static int ep0_set_address(struct bdc *bdc, struct usb_ctrlrequest *ctrl)
1111 {
1112         enum usb_device_state state = bdc->gadget.state;
1113         int ret = 0;
1114         u32 addr;
1115
1116         addr = le16_to_cpu(ctrl->wValue);
1117         dev_dbg(bdc->dev,
1118                 "%s addr:%d dev state:%d\n",
1119                 __func__, addr, state);
1120
1121         if (addr > 127)
1122                 return -EINVAL;
1123
1124         switch (state) {
1125         case USB_STATE_DEFAULT:
1126         case USB_STATE_ADDRESS:
1127                 /* Issue Address device command */
1128                 ret = bdc_address_device(bdc, addr);
1129                 if (ret)
1130                         return ret;
1131
1132                 if (addr)
1133                         usb_gadget_set_state(&bdc->gadget, USB_STATE_ADDRESS);
1134                 else
1135                         usb_gadget_set_state(&bdc->gadget, USB_STATE_DEFAULT);
1136
1137                 bdc->dev_addr = addr;
1138                 break;
1139         default:
1140                 dev_warn(bdc->dev,
1141                         "SET Address in wrong device state %d\n",
1142                         state);
1143                 ret = -EINVAL;
1144         }
1145
1146         return ret;
1147 }
1148
1149 /* Handler for SET/CLEAR FEATURE requests for device */
1150 static int ep0_handle_feature_dev(struct bdc *bdc, u16 wValue,
1151                                                         u16 wIndex, bool set)
1152 {
1153         enum usb_device_state state = bdc->gadget.state;
1154         u32     usppms = 0;
1155
1156         dev_dbg(bdc->dev, "%s set:%d dev state:%d\n",
1157                                         __func__, set, state);
1158         switch (wValue) {
1159         case USB_DEVICE_REMOTE_WAKEUP:
1160                 dev_dbg(bdc->dev, "USB_DEVICE_REMOTE_WAKEUP\n");
1161                 if (set)
1162                         bdc->devstatus |= REMOTE_WAKE_ENABLE;
1163                 else
1164                         bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1165                 break;
1166
1167         case USB_DEVICE_TEST_MODE:
1168                 dev_dbg(bdc->dev, "USB_DEVICE_TEST_MODE\n");
1169                 if ((wIndex & 0xFF) ||
1170                                 (bdc->gadget.speed != USB_SPEED_HIGH) || !set)
1171                         return -EINVAL;
1172
1173                 bdc->test_mode = wIndex >> 8;
1174                 break;
1175
1176         case USB_DEVICE_U1_ENABLE:
1177                 dev_dbg(bdc->dev, "USB_DEVICE_U1_ENABLE\n");
1178
1179                 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1180                                                 state != USB_STATE_CONFIGURED)
1181                         return -EINVAL;
1182
1183                 usppms =  bdc_readl(bdc->regs, BDC_USPPMS);
1184                 if (set) {
1185                         /* clear previous u1t */
1186                         usppms &= ~BDC_U1T(BDC_U1T_MASK);
1187                         usppms |= BDC_U1T(U1_TIMEOUT);
1188                         usppms |= BDC_U1E | BDC_PORT_W1S;
1189                         bdc->devstatus |= (1 << USB_DEV_STAT_U1_ENABLED);
1190                 } else {
1191                         usppms &= ~BDC_U1E;
1192                         usppms |= BDC_PORT_W1S;
1193                         bdc->devstatus &= ~(1 << USB_DEV_STAT_U1_ENABLED);
1194                 }
1195                 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1196                 break;
1197
1198         case USB_DEVICE_U2_ENABLE:
1199                 dev_dbg(bdc->dev, "USB_DEVICE_U2_ENABLE\n");
1200
1201                 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1202                                                 state != USB_STATE_CONFIGURED)
1203                         return -EINVAL;
1204
1205                 usppms = bdc_readl(bdc->regs, BDC_USPPMS);
1206                 if (set) {
1207                         usppms |= BDC_U2E;
1208                         usppms |= BDC_U2A;
1209                         bdc->devstatus |= (1 << USB_DEV_STAT_U2_ENABLED);
1210                 } else {
1211                         usppms &= ~BDC_U2E;
1212                         usppms &= ~BDC_U2A;
1213                         bdc->devstatus &= ~(1 << USB_DEV_STAT_U2_ENABLED);
1214                 }
1215                 bdc_writel(bdc->regs, BDC_USPPMS, usppms);
1216                 break;
1217
1218         case USB_DEVICE_LTM_ENABLE:
1219                 dev_dbg(bdc->dev, "USB_DEVICE_LTM_ENABLE?\n");
1220                 if (bdc->gadget.speed != USB_SPEED_SUPER ||
1221                                                 state != USB_STATE_CONFIGURED)
1222                         return -EINVAL;
1223                 break;
1224         default:
1225                 dev_err(bdc->dev, "Unknown wValue:%d\n", wValue);
1226                 return -EOPNOTSUPP;
1227         } /* USB_RECIP_DEVICE end */
1228
1229         return 0;
1230 }
1231
1232 /* SET/CLEAR FEATURE handler */
1233 static int ep0_handle_feature(struct bdc *bdc,
1234                               struct usb_ctrlrequest *setup_pkt, bool set)
1235 {
1236         enum usb_device_state state = bdc->gadget.state;
1237         struct bdc_ep *ep;
1238         u16 wValue;
1239         u16 wIndex;
1240         int epnum;
1241
1242         wValue = le16_to_cpu(setup_pkt->wValue);
1243         wIndex = le16_to_cpu(setup_pkt->wIndex);
1244
1245         dev_dbg(bdc->dev,
1246                 "%s wValue=%d wIndex=%d devstate=%08x speed=%d set=%d",
1247                 __func__, wValue, wIndex, state,
1248                 bdc->gadget.speed, set);
1249
1250         switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1251         case USB_RECIP_DEVICE:
1252                 return ep0_handle_feature_dev(bdc, wValue, wIndex, set);
1253         case USB_RECIP_INTERFACE:
1254                 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1255                 /* USB3 spec, sec 9.4.9 */
1256                 if (wValue != USB_INTRF_FUNC_SUSPEND)
1257                         return -EINVAL;
1258                 /* USB3 spec, Table 9-8 */
1259                 if (set) {
1260                         if (wIndex & USB_INTRF_FUNC_SUSPEND_RW) {
1261                                 dev_dbg(bdc->dev, "SET REMOTE_WAKEUP\n");
1262                                 bdc->devstatus |= REMOTE_WAKE_ENABLE;
1263                         } else {
1264                                 dev_dbg(bdc->dev, "CLEAR REMOTE_WAKEUP\n");
1265                                 bdc->devstatus &= ~REMOTE_WAKE_ENABLE;
1266                         }
1267                 }
1268                 break;
1269
1270         case USB_RECIP_ENDPOINT:
1271                 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1272                 if (wValue != USB_ENDPOINT_HALT)
1273                         return -EINVAL;
1274
1275                 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1276                 if (epnum) {
1277                         if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1278                                 epnum = epnum * 2 + 1;
1279                         else
1280                                 epnum *= 2;
1281                 } else {
1282                         epnum = 1; /*EP0*/
1283                 }
1284                 /*
1285                  * If CLEAR_FEATURE on ep0 then don't do anything as the stall
1286                  * condition on ep0 has already been cleared when SETUP packet
1287                  * was received.
1288                  */
1289                 if (epnum == 1 && !set) {
1290                         dev_dbg(bdc->dev, "ep0 stall already cleared\n");
1291                         return 0;
1292                 }
1293                 dev_dbg(bdc->dev, "epnum=%d\n", epnum);
1294                 ep = bdc->bdc_ep_array[epnum];
1295                 if (!ep)
1296                         return -EINVAL;
1297
1298                 return ep_set_halt(ep, set);
1299         default:
1300                 dev_err(bdc->dev, "Unknown recipient\n");
1301                 return -EINVAL;
1302         }
1303
1304         return 0;
1305 }
1306
1307 /* GET_STATUS request handler */
1308 static int ep0_handle_status(struct bdc *bdc,
1309                              struct usb_ctrlrequest *setup_pkt)
1310 {
1311         enum usb_device_state state = bdc->gadget.state;
1312         struct bdc_ep *ep;
1313         u16 usb_status = 0;
1314         u32 epnum;
1315         u16 wIndex;
1316
1317         /* USB2.0 spec sec 9.4.5 */
1318         if (state == USB_STATE_DEFAULT)
1319                 return -EINVAL;
1320         wIndex = le16_to_cpu(setup_pkt->wIndex);
1321         dev_dbg(bdc->dev, "%s\n", __func__);
1322         usb_status = bdc->devstatus;
1323         switch (setup_pkt->bRequestType & USB_RECIP_MASK) {
1324         case USB_RECIP_DEVICE:
1325                 dev_dbg(bdc->dev,
1326                         "USB_RECIP_DEVICE devstatus:%08x\n",
1327                         bdc->devstatus);
1328                 /* USB3 spec, sec 9.4.5 */
1329                 if (bdc->gadget.speed == USB_SPEED_SUPER)
1330                         usb_status &= ~REMOTE_WAKE_ENABLE;
1331                 break;
1332
1333         case USB_RECIP_INTERFACE:
1334                 dev_dbg(bdc->dev, "USB_RECIP_INTERFACE\n");
1335                 if (bdc->gadget.speed == USB_SPEED_SUPER) {
1336                         /*
1337                          * This should come from func for Func remote wkup
1338                          * usb_status |=1;
1339                          */
1340                         if (bdc->devstatus & REMOTE_WAKE_ENABLE)
1341                                 usb_status |= REMOTE_WAKE_ENABLE;
1342                 } else {
1343                         usb_status = 0;
1344                 }
1345
1346                 break;
1347
1348         case USB_RECIP_ENDPOINT:
1349                 dev_dbg(bdc->dev, "USB_RECIP_ENDPOINT\n");
1350                 epnum = wIndex & USB_ENDPOINT_NUMBER_MASK;
1351                 if (epnum) {
1352                         if ((wIndex & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN)
1353                                 epnum = epnum*2 + 1;
1354                         else
1355                                 epnum *= 2;
1356                 } else {
1357                         epnum = 1; /* EP0 */
1358                 }
1359
1360                 ep = bdc->bdc_ep_array[epnum];
1361                 if (!ep) {
1362                         dev_err(bdc->dev, "ISSUE, GET_STATUS for invalid EP ?");
1363                         return -EINVAL;
1364                 }
1365                 if (ep->flags & BDC_EP_STALL)
1366                         usb_status |= 1 << USB_ENDPOINT_HALT;
1367
1368                 break;
1369         default:
1370                 dev_err(bdc->dev, "Unknown recipient for get_status\n");
1371                 return -EINVAL;
1372         }
1373         /* prepare a data stage for GET_STATUS */
1374         dev_dbg(bdc->dev, "usb_status=%08x\n", usb_status);
1375         *(__le16 *)bdc->ep0_response_buff = cpu_to_le16(usb_status);
1376         bdc->ep0_req.usb_req.length = 2;
1377         bdc->ep0_req.usb_req.buf = &bdc->ep0_response_buff;
1378         ep0_queue_data_stage(bdc);
1379
1380         return 0;
1381 }
1382
1383 static void ep0_set_sel_cmpl(struct usb_ep *_ep, struct usb_request *_req)
1384 {
1385         /* ep0_set_sel_cmpl */
1386 }
1387
1388 /* Queue data stage to handle 6 byte SET_SEL request */
1389 static int ep0_set_sel(struct bdc *bdc,
1390                              struct usb_ctrlrequest *setup_pkt)
1391 {
1392         struct bdc_ep   *ep;
1393         u16     wLength;
1394
1395         dev_dbg(bdc->dev, "%s\n", __func__);
1396         wLength = le16_to_cpu(setup_pkt->wLength);
1397         if (unlikely(wLength != 6)) {
1398                 dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
1399                 return -EINVAL;
1400         }
1401         ep = bdc->bdc_ep_array[1];
1402         bdc->ep0_req.ep = ep;
1403         bdc->ep0_req.usb_req.length = 6;
1404         bdc->ep0_req.usb_req.buf = bdc->ep0_response_buff;
1405         bdc->ep0_req.usb_req.complete = ep0_set_sel_cmpl;
1406         ep0_queue_data_stage(bdc);
1407
1408         return 0;
1409 }
1410
1411 /*
1412  * Queue a 0 byte bd only if wLength is more than the length and and length is
1413  * a multiple of MaxPacket then queue 0 byte BD
1414  */
1415 static int ep0_queue_zlp(struct bdc *bdc)
1416 {
1417         int ret;
1418
1419         dev_dbg(bdc->dev, "%s\n", __func__);
1420         bdc->ep0_req.ep = bdc->bdc_ep_array[1];
1421         bdc->ep0_req.usb_req.length = 0;
1422         bdc->ep0_req.usb_req.complete = NULL;
1423         bdc->ep0_state = WAIT_FOR_DATA_START;
1424         ret = bdc_queue_xfr(bdc, &bdc->ep0_req);
1425         if (ret) {
1426                 dev_err(bdc->dev, "err queueing zlp :%d\n", ret);
1427                 return ret;
1428         }
1429         bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1430
1431         return 0;
1432 }
1433
1434 /* Control request handler */
1435 static int handle_control_request(struct bdc *bdc)
1436 {
1437         enum usb_device_state state = bdc->gadget.state;
1438         struct usb_ctrlrequest *setup_pkt;
1439         int delegate_setup = 0;
1440         int ret = 0;
1441         int config = 0;
1442
1443         setup_pkt = &bdc->setup_pkt;
1444         dev_dbg(bdc->dev, "%s\n", __func__);
1445         if ((setup_pkt->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD) {
1446                 switch (setup_pkt->bRequest) {
1447                 case USB_REQ_SET_ADDRESS:
1448                         dev_dbg(bdc->dev, "USB_REQ_SET_ADDRESS\n");
1449                         ret = ep0_set_address(bdc, setup_pkt);
1450                         bdc->devstatus &= DEVSTATUS_CLEAR;
1451                         break;
1452
1453                 case USB_REQ_SET_CONFIGURATION:
1454                         dev_dbg(bdc->dev, "USB_REQ_SET_CONFIGURATION\n");
1455                         if (state == USB_STATE_ADDRESS) {
1456                                 usb_gadget_set_state(&bdc->gadget,
1457                                                         USB_STATE_CONFIGURED);
1458                         } else if (state == USB_STATE_CONFIGURED) {
1459                                 /*
1460                                  * USB2 spec sec 9.4.7, if wValue is 0 then dev
1461                                  * is moved to addressed state
1462                                  */
1463                                 config = le16_to_cpu(setup_pkt->wValue);
1464                                 if (!config)
1465                                         usb_gadget_set_state(
1466                                                         &bdc->gadget,
1467                                                         USB_STATE_ADDRESS);
1468                         }
1469                         delegate_setup = 1;
1470                         break;
1471
1472                 case USB_REQ_SET_FEATURE:
1473                         dev_dbg(bdc->dev, "USB_REQ_SET_FEATURE\n");
1474                         ret = ep0_handle_feature(bdc, setup_pkt, 1);
1475                         break;
1476
1477                 case USB_REQ_CLEAR_FEATURE:
1478                         dev_dbg(bdc->dev, "USB_REQ_CLEAR_FEATURE\n");
1479                         ret = ep0_handle_feature(bdc, setup_pkt, 0);
1480                         break;
1481
1482                 case USB_REQ_GET_STATUS:
1483                         dev_dbg(bdc->dev, "USB_REQ_GET_STATUS\n");
1484                         ret = ep0_handle_status(bdc, setup_pkt);
1485                         break;
1486
1487                 case USB_REQ_SET_SEL:
1488                         dev_dbg(bdc->dev, "USB_REQ_SET_SEL\n");
1489                         ret = ep0_set_sel(bdc, setup_pkt);
1490                         break;
1491
1492                 case USB_REQ_SET_ISOCH_DELAY:
1493                         dev_warn(bdc->dev,
1494                         "USB_REQ_SET_ISOCH_DELAY not handled\n");
1495                         ret = 0;
1496                         break;
1497                 default:
1498                         delegate_setup = 1;
1499                 }
1500         } else {
1501                 delegate_setup = 1;
1502         }
1503
1504         if (delegate_setup) {
1505                 spin_unlock(&bdc->lock);
1506                 ret = bdc->gadget_driver->setup(&bdc->gadget, setup_pkt);
1507                 spin_lock(&bdc->lock);
1508         }
1509
1510         return ret;
1511 }
1512
1513 /* EP0: Data stage started */
1514 void bdc_xsf_ep0_data_start(struct bdc *bdc, struct bdc_sr *sreport)
1515 {
1516         struct bdc_ep *ep;
1517         int ret = 0;
1518
1519         dev_dbg(bdc->dev, "%s\n", __func__);
1520         ep = bdc->bdc_ep_array[1];
1521         /* If ep0 was stalled, the clear it first */
1522         if (ep->flags & BDC_EP_STALL) {
1523                 ret = ep_set_halt(ep, 0);
1524                 if (ret)
1525                         goto err;
1526         }
1527         if (bdc->ep0_state != WAIT_FOR_DATA_START)
1528                 dev_warn(bdc->dev,
1529                         "Data stage not expected ep0_state:%s\n",
1530                         ep0_state_string[bdc->ep0_state]);
1531
1532         ret = handle_control_request(bdc);
1533         if (ret == USB_GADGET_DELAYED_STATUS) {
1534                 /*
1535                  * The ep0 state will remain WAIT_FOR_DATA_START till
1536                  * we received ep_queue on ep0
1537                  */
1538                 bdc->delayed_status = true;
1539                 return;
1540         }
1541         if (!ret) {
1542                 bdc->ep0_state = WAIT_FOR_DATA_XMIT;
1543                 dev_dbg(bdc->dev,
1544                         "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1545                 return;
1546         }
1547 err:
1548         ep0_stall(bdc);
1549 }
1550
1551 /* EP0: status stage started */
1552 void bdc_xsf_ep0_status_start(struct bdc *bdc, struct bdc_sr *sreport)
1553 {
1554         struct usb_ctrlrequest *setup_pkt;
1555         struct bdc_ep *ep;
1556         int ret = 0;
1557
1558         dev_dbg(bdc->dev,
1559                 "%s ep0_state:%s",
1560                 __func__, ep0_state_string[bdc->ep0_state]);
1561         ep = bdc->bdc_ep_array[1];
1562
1563         /* check if ZLP was queued? */
1564         if (bdc->zlp_needed)
1565                 bdc->zlp_needed = false;
1566
1567         if (ep->flags & BDC_EP_STALL) {
1568                 ret = ep_set_halt(ep, 0);
1569                 if (ret)
1570                         goto err;
1571         }
1572
1573         if ((bdc->ep0_state != WAIT_FOR_STATUS_START) &&
1574                                 (bdc->ep0_state != WAIT_FOR_DATA_XMIT))
1575                 dev_err(bdc->dev,
1576                         "Status stage recv but ep0_state:%s\n",
1577                         ep0_state_string[bdc->ep0_state]);
1578
1579         /* check if data stage is in progress ? */
1580         if (bdc->ep0_state == WAIT_FOR_DATA_XMIT) {
1581                 bdc->ep0_state = STATUS_PENDING;
1582                 /* Status stage will be queued upon Data stage transmit event */
1583                 dev_dbg(bdc->dev,
1584                         "status started but data  not transmitted yet\n");
1585                 return;
1586         }
1587         setup_pkt = &bdc->setup_pkt;
1588
1589         /*
1590          * 2 stage setup then only process the setup, for 3 stage setup the date
1591          * stage is already handled
1592          */
1593         if (!le16_to_cpu(setup_pkt->wLength)) {
1594                 ret = handle_control_request(bdc);
1595                 if (ret == USB_GADGET_DELAYED_STATUS) {
1596                         bdc->delayed_status = true;
1597                         /* ep0_state will remain WAIT_FOR_STATUS_START */
1598                         return;
1599                 }
1600         }
1601         if (!ret) {
1602                 /* Queue a status stage BD */
1603                 ep0_queue_status_stage(bdc);
1604                 bdc->ep0_state = WAIT_FOR_STATUS_XMIT;
1605                 dev_dbg(bdc->dev,
1606                         "ep0_state:%s", ep0_state_string[bdc->ep0_state]);
1607                 return;
1608         }
1609 err:
1610         ep0_stall(bdc);
1611 }
1612
1613 /* Helper function to update ep0 upon SR with xsf_succ or xsf_short */
1614 static void ep0_xsf_complete(struct bdc *bdc, struct bdc_sr *sreport)
1615 {
1616         dev_dbg(bdc->dev, "%s\n", __func__);
1617         switch (bdc->ep0_state) {
1618         case WAIT_FOR_DATA_XMIT:
1619                 bdc->ep0_state = WAIT_FOR_STATUS_START;
1620                 break;
1621         case WAIT_FOR_STATUS_XMIT:
1622                 bdc->ep0_state = WAIT_FOR_SETUP;
1623                 if (bdc->test_mode) {
1624                         int ret;
1625
1626                         dev_dbg(bdc->dev, "test_mode:%d\n", bdc->test_mode);
1627                         ret = bdc_set_test_mode(bdc);
1628                         if (ret < 0) {
1629                                 dev_err(bdc->dev, "Err in setting Test mode\n");
1630                                 return;
1631                         }
1632                         bdc->test_mode = 0;
1633                 }
1634                 break;
1635         case STATUS_PENDING:
1636                 bdc_xsf_ep0_status_start(bdc, sreport);
1637                 break;
1638
1639         default:
1640                 dev_err(bdc->dev,
1641                         "Unknown ep0_state:%s\n",
1642                         ep0_state_string[bdc->ep0_state]);
1643
1644         }
1645 }
1646
1647 /* xfr completion status report handler */
1648 void bdc_sr_xsf(struct bdc *bdc, struct bdc_sr *sreport)
1649 {
1650         struct bdc_ep *ep;
1651         u32 sr_status;
1652         u8 ep_num;
1653
1654         ep_num = (le32_to_cpu(sreport->offset[3])>>4) & 0x1f;
1655         ep = bdc->bdc_ep_array[ep_num];
1656         if (!ep || !(ep->flags & BDC_EP_ENABLED)) {
1657                 dev_err(bdc->dev, "xsf for ep not enabled\n");
1658                 return;
1659         }
1660         /*
1661          * check if this transfer is after link went from U3->U0 due
1662          * to remote wakeup
1663          */
1664         if (bdc->devstatus & FUNC_WAKE_ISSUED) {
1665                 bdc->devstatus &= ~(FUNC_WAKE_ISSUED);
1666                 dev_dbg(bdc->dev, "%s clearing FUNC_WAKE_ISSUED flag\n",
1667                                                                 __func__);
1668         }
1669         sr_status = XSF_STS(le32_to_cpu(sreport->offset[3]));
1670         dev_dbg_ratelimited(bdc->dev, "%s sr_status=%d ep:%s\n",
1671                                         __func__, sr_status, ep->name);
1672
1673         switch (sr_status) {
1674         case XSF_SUCC:
1675         case XSF_SHORT:
1676                 handle_xsr_succ_status(bdc, ep, sreport);
1677                 if (ep_num == 1)
1678                         ep0_xsf_complete(bdc, sreport);
1679                 break;
1680
1681         case XSF_SETUP_RECV:
1682         case XSF_DATA_START:
1683         case XSF_STATUS_START:
1684                 if (ep_num != 1) {
1685                         dev_err(bdc->dev,
1686                                 "ep0 related packets on non ep0 endpoint");
1687                         return;
1688                 }
1689                 bdc->sr_xsf_ep0[sr_status - XSF_SETUP_RECV](bdc, sreport);
1690                 break;
1691
1692         case XSF_BABB:
1693                 if (ep_num == 1) {
1694                         dev_dbg(bdc->dev, "Babble on ep0 zlp_need:%d\n",
1695                                                         bdc->zlp_needed);
1696                         /*
1697                          * If the last completed transfer had wLength >Data Len,
1698                          * and Len is multiple of MaxPacket,then queue ZLP
1699                          */
1700                         if (bdc->zlp_needed) {
1701                                 /* queue 0 length bd */
1702                                 ep0_queue_zlp(bdc);
1703                                 return;
1704                         }
1705                 }
1706                 dev_warn(bdc->dev, "Babble on ep not handled\n");
1707                 break;
1708         default:
1709                 dev_warn(bdc->dev, "sr status not handled:%x\n", sr_status);
1710                 break;
1711         }
1712 }
1713
1714 static int bdc_gadget_ep_queue(struct usb_ep *_ep,
1715                                 struct usb_request *_req, gfp_t gfp_flags)
1716 {
1717         struct bdc_req *req;
1718         unsigned long flags;
1719         struct bdc_ep *ep;
1720         struct bdc *bdc;
1721         int ret;
1722
1723         if (!_ep || !_ep->desc)
1724                 return -ESHUTDOWN;
1725
1726         if (!_req || !_req->complete || !_req->buf)
1727                 return -EINVAL;
1728
1729         ep = to_bdc_ep(_ep);
1730         req = to_bdc_req(_req);
1731         bdc = ep->bdc;
1732         dev_dbg(bdc->dev, "%s ep:%p req:%p\n", __func__, ep, req);
1733         dev_dbg(bdc->dev, "queuing request %p to %s length %d zero:%d\n",
1734                                 _req, ep->name, _req->length, _req->zero);
1735
1736         if (!ep->usb_ep.desc) {
1737                 dev_warn(bdc->dev,
1738                         "trying to queue req %p to disabled %s\n",
1739                         _req, ep->name);
1740                 return -ESHUTDOWN;
1741         }
1742
1743         if (_req->length > MAX_XFR_LEN) {
1744                 dev_warn(bdc->dev,
1745                         "req length > supported MAX:%d requested:%d\n",
1746                         MAX_XFR_LEN, _req->length);
1747                 return -EOPNOTSUPP;
1748         }
1749         spin_lock_irqsave(&bdc->lock, flags);
1750         if (ep == bdc->bdc_ep_array[1])
1751                 ret = ep0_queue(ep, req);
1752         else
1753                 ret = ep_queue(ep, req);
1754
1755         spin_unlock_irqrestore(&bdc->lock, flags);
1756
1757         return ret;
1758 }
1759
1760 static int bdc_gadget_ep_dequeue(struct usb_ep *_ep,
1761                                   struct usb_request *_req)
1762 {
1763         struct bdc_req *req;
1764         unsigned long flags;
1765         struct bdc_ep *ep;
1766         struct bdc *bdc;
1767         int ret;
1768
1769         if (!_ep || !_req)
1770                 return -EINVAL;
1771
1772         ep = to_bdc_ep(_ep);
1773         req = to_bdc_req(_req);
1774         bdc = ep->bdc;
1775         dev_dbg(bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1776         bdc_dbg_bd_list(bdc, ep);
1777         spin_lock_irqsave(&bdc->lock, flags);
1778         /* make sure it's still queued on this endpoint */
1779         list_for_each_entry(req, &ep->queue, queue) {
1780                 if (&req->usb_req == _req)
1781                         break;
1782         }
1783         if (&req->usb_req != _req) {
1784                 spin_unlock_irqrestore(&bdc->lock, flags);
1785                 dev_err(bdc->dev, "usb_req !=req n");
1786                 return -EINVAL;
1787         }
1788         ret = ep_dequeue(ep, req);
1789         if (ret) {
1790                 ret = -EOPNOTSUPP;
1791                 goto err;
1792         }
1793         bdc_req_complete(ep, req, -ECONNRESET);
1794
1795 err:
1796         bdc_dbg_bd_list(bdc, ep);
1797         spin_unlock_irqrestore(&bdc->lock, flags);
1798
1799         return ret;
1800 }
1801
1802 static int bdc_gadget_ep_set_halt(struct usb_ep *_ep, int value)
1803 {
1804         unsigned long flags;
1805         struct bdc_ep *ep;
1806         struct bdc *bdc;
1807         int ret;
1808
1809         ep = to_bdc_ep(_ep);
1810         bdc = ep->bdc;
1811         dev_dbg(bdc->dev, "%s ep:%s value=%d\n", __func__, ep->name, value);
1812         spin_lock_irqsave(&bdc->lock, flags);
1813         if (usb_endpoint_xfer_isoc(ep->usb_ep.desc))
1814                 ret = -EINVAL;
1815         else if (!list_empty(&ep->queue))
1816                 ret = -EAGAIN;
1817         else
1818                 ret = ep_set_halt(ep, value);
1819
1820         spin_unlock_irqrestore(&bdc->lock, flags);
1821
1822         return ret;
1823 }
1824
1825 static struct usb_request *bdc_gadget_alloc_request(struct usb_ep *_ep,
1826                                                      gfp_t gfp_flags)
1827 {
1828         struct bdc_req *req;
1829         struct bdc_ep *ep;
1830
1831         req = kzalloc(sizeof(*req), gfp_flags);
1832         if (!req)
1833                 return NULL;
1834
1835         ep = to_bdc_ep(_ep);
1836         req->ep = ep;
1837         req->epnum = ep->ep_num;
1838         req->usb_req.dma = DMA_ADDR_INVALID;
1839         dev_dbg(ep->bdc->dev, "%s ep:%s req:%p\n", __func__, ep->name, req);
1840
1841         return &req->usb_req;
1842 }
1843
1844 static void bdc_gadget_free_request(struct usb_ep *_ep,
1845                                      struct usb_request *_req)
1846 {
1847         struct bdc_req *req;
1848
1849         req = to_bdc_req(_req);
1850         kfree(req);
1851 }
1852
1853 /* endpoint operations */
1854
1855 /* configure endpoint and also allocate resources */
1856 static int bdc_gadget_ep_enable(struct usb_ep *_ep,
1857                                  const struct usb_endpoint_descriptor *desc)
1858 {
1859         unsigned long flags;
1860         struct bdc_ep *ep;
1861         struct bdc *bdc;
1862         int ret;
1863
1864         if (!_ep || !desc || desc->bDescriptorType != USB_DT_ENDPOINT) {
1865                 pr_debug("bdc_gadget_ep_enable invalid parameters\n");
1866                 return -EINVAL;
1867         }
1868
1869         if (!desc->wMaxPacketSize) {
1870                 pr_debug("bdc_gadget_ep_enable missing wMaxPacketSize\n");
1871                 return -EINVAL;
1872         }
1873
1874         ep = to_bdc_ep(_ep);
1875         bdc = ep->bdc;
1876
1877         /* Sanity check, upper layer will not send enable for ep0 */
1878         if (ep == bdc->bdc_ep_array[1])
1879                 return -EINVAL;
1880
1881         if (!bdc->gadget_driver
1882             || bdc->gadget.speed == USB_SPEED_UNKNOWN) {
1883                 return -ESHUTDOWN;
1884         }
1885
1886         dev_dbg(bdc->dev, "%s Enabling %s\n", __func__, ep->name);
1887         spin_lock_irqsave(&bdc->lock, flags);
1888         ep->desc = desc;
1889         ep->comp_desc = _ep->comp_desc;
1890         ret = bdc_ep_enable(ep);
1891         spin_unlock_irqrestore(&bdc->lock, flags);
1892
1893         return ret;
1894 }
1895
1896 static int bdc_gadget_ep_disable(struct usb_ep *_ep)
1897 {
1898         unsigned long flags;
1899         struct bdc_ep *ep;
1900         struct bdc *bdc;
1901         int ret;
1902
1903         if (!_ep) {
1904                 pr_debug("bdc: invalid parameters\n");
1905                 return -EINVAL;
1906         }
1907         ep = to_bdc_ep(_ep);
1908         bdc = ep->bdc;
1909
1910         /* Upper layer will not call this for ep0, but do a sanity check */
1911         if (ep == bdc->bdc_ep_array[1]) {
1912                 dev_warn(bdc->dev, "%s called for ep0\n", __func__);
1913                 return -EINVAL;
1914         }
1915         dev_dbg(bdc->dev,
1916                 "%s() ep:%s ep->flags:%08x\n",
1917                 __func__, ep->name, ep->flags);
1918
1919         if (!(ep->flags & BDC_EP_ENABLED)) {
1920                 dev_warn(bdc->dev, "%s is already disabled\n", ep->name);
1921                 return 0;
1922         }
1923         spin_lock_irqsave(&bdc->lock, flags);
1924         ret = bdc_ep_disable(ep);
1925         spin_unlock_irqrestore(&bdc->lock, flags);
1926
1927         return ret;
1928 }
1929
1930 static const struct usb_ep_ops bdc_gadget_ep_ops = {
1931         .enable = bdc_gadget_ep_enable,
1932         .disable = bdc_gadget_ep_disable,
1933         .alloc_request = bdc_gadget_alloc_request,
1934         .free_request = bdc_gadget_free_request,
1935         .queue = bdc_gadget_ep_queue,
1936         .dequeue = bdc_gadget_ep_dequeue,
1937         .set_halt = bdc_gadget_ep_set_halt
1938 };
1939
1940 /* dir = 1 is IN */
1941 static int init_ep(struct bdc *bdc, u32 epnum, u32 dir)
1942 {
1943         struct bdc_ep *ep;
1944
1945         dev_dbg(bdc->dev, "%s epnum=%d dir=%d\n", __func__, epnum, dir);
1946         ep = kzalloc(sizeof(*ep), GFP_KERNEL);
1947         if (!ep)
1948                 return -ENOMEM;
1949
1950         ep->bdc = bdc;
1951         ep->dir = dir;
1952
1953         if (dir)
1954                 ep->usb_ep.caps.dir_in = true;
1955         else
1956                 ep->usb_ep.caps.dir_out = true;
1957
1958         /* ep->ep_num is the index inside bdc_ep */
1959         if (epnum == 1) {
1960                 ep->ep_num = 1;
1961                 bdc->bdc_ep_array[ep->ep_num] = ep;
1962                 snprintf(ep->name, sizeof(ep->name), "ep%d", epnum - 1);
1963                 usb_ep_set_maxpacket_limit(&ep->usb_ep, EP0_MAX_PKT_SIZE);
1964                 ep->usb_ep.caps.type_control = true;
1965                 ep->comp_desc = NULL;
1966                 bdc->gadget.ep0 = &ep->usb_ep;
1967         } else {
1968                 if (dir)
1969                         ep->ep_num = epnum * 2 - 1;
1970                 else
1971                         ep->ep_num = epnum * 2 - 2;
1972
1973                 bdc->bdc_ep_array[ep->ep_num] = ep;
1974                 snprintf(ep->name, sizeof(ep->name), "ep%d%s", epnum - 1,
1975                          dir & 1 ? "in" : "out");
1976
1977                 usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
1978                 ep->usb_ep.caps.type_iso = true;
1979                 ep->usb_ep.caps.type_bulk = true;
1980                 ep->usb_ep.caps.type_int = true;
1981                 ep->usb_ep.max_streams = 0;
1982                 list_add_tail(&ep->usb_ep.ep_list, &bdc->gadget.ep_list);
1983         }
1984         ep->usb_ep.ops = &bdc_gadget_ep_ops;
1985         ep->usb_ep.name = ep->name;
1986         ep->flags = 0;
1987         ep->ignore_next_sr = false;
1988         dev_dbg(bdc->dev, "ep=%p ep->usb_ep.name=%s epnum=%d ep->epnum=%d\n",
1989                                 ep, ep->usb_ep.name, epnum, ep->ep_num);
1990
1991         INIT_LIST_HEAD(&ep->queue);
1992
1993         return 0;
1994 }
1995
1996 /* Init all ep */
1997 int bdc_init_ep(struct bdc *bdc)
1998 {
1999         u8 epnum;
2000         int ret;
2001
2002         dev_dbg(bdc->dev, "%s()\n", __func__);
2003         INIT_LIST_HEAD(&bdc->gadget.ep_list);
2004         /* init ep0 */
2005         ret = init_ep(bdc, 1, 0);
2006         if (ret) {
2007                 dev_err(bdc->dev, "init ep ep0 fail %d\n", ret);
2008                 return ret;
2009         }
2010
2011         for (epnum = 2; epnum <= bdc->num_eps / 2; epnum++) {
2012                 /* OUT */
2013                 ret = init_ep(bdc, epnum, 0);
2014                 if (ret) {
2015                         dev_err(bdc->dev,
2016                                 "init ep failed for:%d error: %d\n",
2017                                 epnum, ret);
2018                         return ret;
2019                 }
2020
2021                 /* IN */
2022                 ret = init_ep(bdc, epnum, 1);
2023                 if (ret) {
2024                         dev_err(bdc->dev,
2025                                 "init ep failed for:%d error: %d\n",
2026                                 epnum, ret);
2027                         return ret;
2028                 }
2029         }
2030
2031         return 0;
2032 }