bertos/cpu/cortex-m3/drv/usb_stm32.c

   1 /**
   2  * \file
   3  * <!--
   4  * This file is part of BeRTOS.
   5  *
   6  * Bertos is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  19  *
  20  * As a special exception, you may use this file as part of a free software
  21  * library without restriction.  Specifically, if other files instantiate
  22  * templates or use macros or inline functions from this file, or you compile
  23  * this file and link it with other files to produce an executable, this
  24  * file does not by itself cause the resulting executable to be covered by
  25  * the GNU General Public License.  This exception does not however
  26  * invalidate any other reasons why the executable file might be covered by
  27  * the GNU General Public License.
  28  *
  29  * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
  30  *
  31  * -->
  32  *
  33  * \brief STM32 USB driver
  34  *
  35  * \author Andrea Righi <arighi@develer.com>
  36  */
  37
  38 #include "cfg/cfg_usb.h"
  39
  40 #define LOG_LEVEL  USB_LOG_LEVEL
  41 #define LOG_FORMAT USB_LOG_FORMAT
  42
  43 #include <cfg/log.h>
  44 #include <cfg/debug.h>
  45 #include <cfg/macros.h>
  46 #include <cfg/module.h>
  47
  48 #include <cpu/irq.h>
  49 #include <cpu/power.h>
  50
  51 #include <drv/irq_cm3.h>
  52 #include <drv/gpio_stm32.h>
  53 #include <drv/clock_stm32.h>
  54 #include <drv/timer.h>
  55 #include <drv/usb.h>
  56
  57 #include <mware/event.h>
  58
  59 #include <string.h> /* memcpy() */
  60
  61 #include "usb_stm32.h"
  62
  63 /* XXX: consider to move this to cfg/macros.h */
  64
  65 /* XXX: redefine this to make it usable within C expression */
  66 #define _MIN(a,b)       (((a) < (b)) ? (a) : (b))
  67
  68 /* STM32 USB registers */
  69 struct stm32_usb
  70 {
  71         reg32_t EP0R;
  72         reg32_t EP1R;
  73         reg32_t EP2R;
  74         reg32_t EP3R;
  75         reg32_t EP4R;
  76         reg32_t EP5R;
  77         reg32_t EP6R;
  78         reg32_t EP7R;
  79         reg32_t __reserved[8];
  80         reg32_t CNTR;
  81         reg32_t ISTR;
  82         reg32_t FNR;
  83         reg32_t DADDR;
  84         reg32_t BTABLE;
  85 };
  86
  87 /* Hardware registers */
  88 static struct stm32_usb *usb = (struct stm32_usb *)USB_BASE_ADDR;
  89
  90 /* Endpoint descriptors: used for handling requests to use with endpoints */
  91 static stm32_UsbEp ep_cnfg[EP_MAX_NUM];
  92 STATIC_ASSERT(EP_MAX_NUM <= EP_MAX_HW_NUM);
  93
  94 /* USB EP0 control descriptor */
  95 static const UsbEndpointDesc USB_CtrlEpDescr0 =
  96 {
  97         .bLength = sizeof(USB_CtrlEpDescr0),
  98         .bDescriptorType = USB_DT_ENDPOINT,
  99         .bEndpointAddress = USB_DIR_OUT | 0,
 100         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
 101         .wMaxPacketSize = USB_EP0_MAX_SIZE,
 102         .bInterval = 0,
 103 };
 104
 105 /* USB EP1 control descriptor */
 106 static const UsbEndpointDesc USB_CtrlEpDescr1 =
 107 {
 108         .bLength = sizeof(USB_CtrlEpDescr1),
 109         .bDescriptorType = USB_DT_ENDPOINT,
 110         .bEndpointAddress = USB_DIR_IN | 0,
 111         .bmAttributes = USB_ENDPOINT_XFER_CONTROL,
 112         .wMaxPacketSize = USB_EP0_MAX_SIZE,
 113         .bInterval = 0,
 114 };
 115
 116 /* USB setup packet */
 117 static UsbCtrlRequest setup_packet;
 118
 119 /* USB device controller: max supported interfaces */
 120 #define USB_MAX_INTERFACE       1
 121
 122 /* USB device controller features */
 123 #define STM32_UDC_FEATURE_SELFPOWERED   BV(0)
 124 #define STM32_UDC_FEATURE_REMOTE_WAKEUP BV(1)
 125
 126 /* Hardware-specific USB device controller structure */
 127 typedef struct stm32_udc
 128 {
 129         uint8_t state;
 130         uint32_t cfg_id;
 131         const UsbConfigDesc *cfg;
 132         uint32_t interfaces;
 133         uint32_t alt[USB_MAX_INTERFACE];
 134         uint32_t address;
 135         uint8_t feature;
 136 } PACKED stm32_udc_t;
 137
 138 /* Hardware-specific USB Device Controller */
 139 static stm32_udc_t udc;
 140
 141 /* Generic USB Device Controller structure */
 142 static UsbDevice *usb_dev;
 143
 144 /* USB packet memory management: list of allocated chunks */
 145 static stm32_UsbMemSlot *mem_use;
 146
 147 /* USB packet memory management: memory buffer metadata */
 148 static stm32_UsbMemSlot memory_buffer[EP_MAX_NUM];
 149
 150 /* Endpoint TX and RX buffers */
 151 /// \cond
 152 /* XXX: use the empty cond section to silent a buggy doxygen warning */
 153 static size_t rx_size, tx_size;
 154
 155 #define EP_BUFFER_SIZE _MIN(CONFIG_USB_BUFSIZE, USB_XFER_MAX_SIZE)
 156 STATIC_ASSERT(!(EP_BUFFER_SIZE & 0x03));
 157
 158 static uint8_t ep_buffer[EP_MAX_NUM][EP_BUFFER_SIZE] ALIGNED(4);
 159 /// \endcond
 160
 161 static Event usb_event_done[EP_MAX_SLOTS];
 162
 163 /* Allocate a free block of the packet memory */
 164 static stm32_UsbMemSlot *usb_malloc(void)
 165 {
 166         unsigned int i;
 167
 168         for (i = 0; i < countof(memory_buffer); i++)
 169                 if (memory_buffer[i].Size == 0)
 170                         return &memory_buffer[i];
 171         return NULL;
 172 }
 173
 174 /* Release a block of the packet memory */
 175 static void usb_free(stm32_UsbMemSlot *pPntr)
 176 {
 177         pPntr->Size = 0;
 178 }
 179
 180 /* Allocate a free chunk of the packet memory (inside a block) */
 181 static bool usb_alloc_buffer(uint16_t *pOffset, uint32_t *size,
 182                             int EndPoint)
 183 {
 184         stm32_UsbMemSlot *mem = mem_use,
 185                         *memNext, *mem_useNew;
 186         uint32_t max_size = *size;
 187
 188         /*
 189          * Packet size alignment:
 190          *  - fine-granularity allocation: size alignment by 2;
 191          *  - coarse-granularity allocation: size alignment by 32.
 192          */
 193         if (max_size < 62)
 194                 max_size = ALIGN_UP(max_size, 2);
 195         else
 196                 max_size = ALIGN_UP(max_size, 32);
 197         /*
 198          * Finding free memory chunks from the allocated blocks of the USB
 199          * packet memory.
 200          */
 201         *pOffset = 0;
 202         while (mem != NULL)
 203         {
 204                 /* Offset alignment by 4 */
 205                 *pOffset = ALIGN_UP(mem->Start + mem->Size, 4);
 206                 memNext = mem->next;
 207                 if ((mem->next == NULL) ||
 208                                 (memNext->Start >=
 209                                         *pOffset + max_size))
 210                         break;
 211                 mem = mem->next;
 212         }
 213         /* Check for out-of-memory condition */
 214         if (UNLIKELY((*pOffset + max_size) >= USB_BDT_OFFSET))
 215                 return false;
 216         /*
 217          * Allocate a new memory block, next to the last allocated block.
 218          */
 219         mem_useNew = usb_malloc();
 220         if (UNLIKELY(mem_useNew == NULL))
 221                 return false;
 222         /* Insert the block to the list of allocated blocks */
 223         if (mem_use == NULL)
 224         {
 225                 mem_use = mem_useNew;
 226                 mem_use->next = NULL;
 227         }
 228         else
 229         {
 230                 mem_useNew->next = mem->next;
 231                 mem->next = mem_useNew;
 232         }
 233         /* Update block's metadata */
 234         mem_useNew->ep_addr = EndPoint;
 235         mem_useNew->Start = *pOffset;
 236         mem_useNew->Size = max_size;
 237
 238         *size = max_size;
 239
 240         return true;
 241 }
 242
 243 /* Release a chunk of the packet memory (inside a block) */
 244 static void usb_free_buffer(int EndPoint)
 245 {
 246         stm32_UsbMemSlot *mem, *memPrev = NULL;
 247         mem = mem_use;
 248
 249         while (mem != NULL)
 250         {
 251                 if (mem->ep_addr == EndPoint)
 252                 {
 253                         if (UNLIKELY(memPrev == NULL))
 254                         {
 255                                 /* Free the first element of the list */
 256                                 mem_use = mem_use->next;
 257                                 usb_free(mem);
 258                                 mem = mem_use;
 259                                 continue;
 260                         }
 261                         memPrev->next = mem->next;
 262                         usb_free(mem);
 263                 }
 264                 else
 265                         memPrev = mem;
 266                 mem = memPrev->next;
 267         }
 268 }
 269
 270 /*-------------------------------------------------------------------------*/
 271
 272 /* Connect USB controller */
 273 static void usb_connect(void)
 274 {
 275         stm32_gpioPinWrite((struct stm32_gpio *)GPIOC_BASE, 1 << 11, 0);
 276 }
 277
 278 /* Set USB device address */
 279 static void usb_set_address(uint32_t addr)
 280 {
 281         usb->DADDR = addr | 0x80;
 282 }
 283
 284 /* Suspend USB controller */
 285 static void usb_suspend(void)
 286 {
 287         usb->CNTR |= bmFSUSP | bmLPMODE;
 288 }
 289
 290 /* Resume USB controller */
 291 static void usb_resume(void)
 292 {
 293         uint32_t line_status;
 294
 295         line_status = usb->FNR & 0xc000;
 296         if (!line_status)
 297                 return;
 298         /* check for noise and eventually return to sleep */
 299         if (line_status == 0xc000)
 300                 usb_suspend();
 301         else
 302                 usb->CNTR &= ~(bmFSUSP | bmLPMODE);
 303 }
 304
 305 /* Convert logical EP address to physical EP address */
 306 static int usb_ep_logical_to_hw(uint8_t ep_addr)
 307 {
 308         int addr = (ep_addr & 0x0f) << 1;
 309         return (ep_addr & 0x80) ? addr + 1 : addr;
 310 }
 311
 312 /* Set EP address */
 313 static void ep_ctrl_set_ea(reg32_t *reg, uint32_t val)
 314 {
 315         val &= 0x0f;
 316         val |= *reg & 0x0700;
 317         val |= USB_CTRL_CLEAR_ONLY_MASK;
 318         *reg = val;
 319 }
 320
 321 /* Get EP IN status */
 322 static uint32_t ep_ctrl_get_stat_tx(reg32_t *reg)
 323 {
 324         return (*reg & (0x3UL << 4)) >> 4;
 325 }
 326
 327 /* Set EP IN state */
 328 static void ep_ctrl_set_stat_tx(reg32_t *reg, stm32_UsbEpState val)
 329 {
 330         uint32_t state;
 331         int i;
 332
 333         /*
 334          * The EP can change state between read and write operations from VALID
 335          * to NAK and result of set operation will be invalid.
 336          */
 337         for (i = 0; i < 2; i++)
 338         {
 339                 if (ep_ctrl_get_stat_tx(reg) == val)
 340                         return;
 341                 state = val;
 342                 state <<= 4;
 343                 state ^= *reg;
 344                 state |= USB_CTRL_CLEAR_ONLY_MASK;
 345                 /* Clear the toggle bits without STAT_TX (4,5) */
 346                 state &= ~0x7040;
 347                 *reg = state;
 348         }
 349 }
 350
 351 /* Set EP DTOG_TX bit (IN) */
 352 static void ep_ctrl_set_dtog_tx(reg32_t *reg, uint32_t val)
 353 {
 354         val = val ? (*reg ^ (1UL << 6)) : *reg;
 355         /* Clear the toggle bits without DTOG_TX (6) */
 356         val &= ~0x7030;
 357         val |= USB_CTRL_CLEAR_ONLY_MASK;
 358         *reg = val;
 359 }
 360
 361 /* Clear EP CTR_TX bit (IN) */
 362 static void ep_ctrl_clr_ctr_tx(reg32_t *reg)
 363 {
 364         uint32_t val = *reg;
 365
 366         val &= ~(USB_CTRL_TOGGLE_MASK | 1UL << 7);
 367         /* Set RX_CTR */
 368         val |= 1UL << 15;
 369         *reg = val;
 370 }
 371
 372 /* Clear EP CTR_RX bit (OUT) */
 373 static void ep_ctrl_clr_ctr_rx(reg32_t *reg)
 374 {
 375         uint32_t val = *reg;
 376         val &= ~(USB_CTRL_TOGGLE_MASK | 1UL << 15);
 377         /* Set TX_CTR */
 378         val |= 1UL << 7;
 379         *reg = val;
 380 }
 381
 382 /* Set EP KIND bit */
 383 static void ep_ctrl_set_ep_kind(reg32_t *reg, uint32_t val)
 384 {
 385         val = val ? (1UL << 8) : 0;
 386         val |= *reg & ~(USB_CTRL_TOGGLE_MASK | (1UL << 8));
 387         val |= USB_CTRL_CLEAR_ONLY_MASK;
 388         *reg = val;
 389 }
 390
 391 /* Set EP type */
 392 static int ep_ctrl_set_ep_type(reg32_t *reg, uint8_t val)
 393 {
 394         uint32_t type;
 395
 396         if (UNLIKELY(val >= EP_TYPE_MAX))
 397         {
 398                 ASSERT(0);
 399                 return USB_INVAL_ERROR;
 400         }
 401         type = val;
 402         type <<= 9;
 403         type |= *reg & ~(USB_CTRL_TOGGLE_MASK | (0x3UL << 9));
 404         type |= USB_CTRL_CLEAR_ONLY_MASK;
 405         *reg = type;
 406
 407         return USB_OK;
 408 }
 409
 410 /* Get EP STAT_RX (OUT) */
 411 static uint32_t ep_ctrl_get_stat_rx(reg32_t *reg)
 412 {
 413         uint32_t val = *reg & (0x3UL << 12);
 414         return val >> 12;
 415 }
 416
 417 /* Set EP STAT_RX (OUT) */
 418 static void ep_ctrl_set_stat_rx(reg32_t *reg, stm32_UsbEpState val)
 419 {
 420         uint32_t state;
 421         int i;
 422
 423         /*
 424          * The EP can change state between read and write operations from VALID
 425          * to NAK and result of set operation will be invalid.
 426          */
 427         for (i = 0; i < 2; i++)
 428         {
 429                 if (ep_ctrl_get_stat_rx(reg) == val)
 430                         return;
 431                 state = val;
 432                 state <<= 12;
 433                 state ^= *reg;
 434                 state |= USB_CTRL_CLEAR_ONLY_MASK;
 435                 /* Clear the toggle bits without STAT_RX (12,13) */
 436                 state &= ~0x4070;
 437                 *reg = state;
 438         }
 439 }
 440
 441 /* Set DTOG_RX bit */
 442 static void ep_ctrl_set_dtog_rx(reg32_t *reg, uint32_t val)
 443 {
 444         val = val ? (*reg ^ (1UL << 14)) : *reg;
 445         /* Clear the toggle bits without DTOG_RX (14) */
 446         val &= ~0x3070;
 447         val |= USB_CTRL_CLEAR_ONLY_MASK;
 448         *reg = val;
 449 }
 450
 451 /* Get EP SETUP bit */
 452 static uint32_t ep_ctrl_get_setup(reg32_t *reg)
 453 {
 454         uint32_t val = *reg & (1UL << 11);
 455         return val ? 1 : 0;
 456 }
 457
 458 /* Core endpoint I/O function */
 459 static void __usb_ep_io(int EP)
 460 {
 461         ssize_t Count, CountHold, Offset;
 462         uint32_t *pDst, *pSrc, Data;
 463         stm32_UsbEp *epd = &ep_cnfg[EP];
 464
 465         if (UNLIKELY(epd->hw == NULL))
 466         {
 467                 LOG_ERR("%s: invalid endpoint (EP%d-%s)\n",
 468                                 __func__,
 469                                 EP >> 1,
 470                                 (EP & 0x01) ? "IN" : "OUT");
 471                 ASSERT(0);
 472                 return;
 473         }
 474         if (epd->status != BEGIN_SERVICED && epd->status != NO_SERVICED)
 475                 return;
 476
 477         if (EP & 0x01)
 478         {
 479                 /* EP IN */
 480                 Count = epd->size - epd->offset;
 481                 while (epd->avail_data)
 482                 {
 483                         if (!Count && !(epd->flags & STM32_USB_EP_ZERO_PACKET))
 484                                 break;
 485
 486                         /* Set Status */
 487                         epd->status = BEGIN_SERVICED;
 488                         /* Get data size */
 489                         if ((epd->flags & STM32_USB_EP_ZERO_PACKET) &&
 490                                         (Count == epd->max_size))
 491                                 epd->flags |= STM32_USB_EP_ZERO_PACKET |
 492                                                 STM32_USB_EP_ZERO_POSSIBLE;
 493
 494                         CountHold = Count = MIN(Count, epd->max_size);
 495                         if (!Count)
 496                                 epd->flags |= STM32_USB_EP_ZERO_PACKET;
 497                         Offset = epd->offset;
 498                         epd->offset += Count;
 499                         switch (epd->type)
 500                         {
 501                         case USB_ENDPOINT_XFER_CONTROL:
 502                         case USB_ENDPOINT_XFER_INT:
 503                                 pDst = (uint32_t *)USB_MEM_ADDR(EP_DTB_READ(EP >> 1, ADDR_TX_OFFSET));
 504                                 break;
 505                         case USB_ENDPOINT_XFER_BULK:
 506                                 pDst = (uint32_t *)USB_MEM_ADDR(EP_DTB_READ(EP >> 1, ADDR_TX_OFFSET));
 507                                 break;
 508                         case USB_ENDPOINT_XFER_ISOC:
 509                                 LOG_ERR("%s: isochronous transfer not supported\n",
 510                                         __func__);
 511                                 /* Fallback to default */
 512                         default:
 513                                 ASSERT(0);
 514                                 return;
 515                         }
 516
 517                         /* Write data to packet memory buffer */
 518                         while (Count)
 519                         {
 520                                 Data = *(epd->write_buffer + Offset++);
 521                                 if (--Count)
 522                                 {
 523                                         Data |= (uint32_t)(*(epd->write_buffer + Offset++)) << 8;
 524                                         --Count;
 525                                 }
 526                                 *pDst++ = Data;
 527                         }
 528
 529                         EP_DTB_WRITE(EP >> 1, COUNT_TX_OFFSET, CountHold);
 530                         ep_ctrl_set_stat_tx(epd->hw, EP_VALID);
 531
 532                         --ep_cnfg[EP].avail_data;
 533                         Count = epd->size - epd->offset;
 534                 }
 535                 if (!Count && !(epd->flags & STM32_USB_EP_ZERO_PACKET))
 536                 {
 537                         epd->status = COMPLETE;
 538                         /* call callback function */
 539                         if (epd->complete)
 540                                 epd->complete(EP);
 541                 }
 542         }
 543         else
 544         {
 545                 /* EP OUT */
 546                 while (epd->avail_data)
 547                 {
 548                         /* Get data size and buffer pointer */
 549                         switch (epd->type)
 550                         {
 551                         case USB_ENDPOINT_XFER_CONTROL:
 552                         case USB_ENDPOINT_XFER_INT:
 553                                 /* Get received bytes number */
 554                                 Count = EP_DTB_READ(EP >> 1, COUNT_RX_OFFSET) & 0x3FF;
 555                                 /* Get address of the USB packet buffer for corresponding EP */
 556                                 pSrc = (uint32_t *)USB_MEM_ADDR(EP_DTB_READ(EP >> 1, ADDR_RX_OFFSET));
 557                                 break;
 558                         case USB_ENDPOINT_XFER_BULK:
 559                                 /* Get received bytes number */
 560                                 Count = EP_DTB_READ(EP >> 1, COUNT_RX_OFFSET) & 0x3FF;
 561                                 /* Get address of the USB packet buffer for corresponding EP */
 562                                 pSrc = (uint32_t *)USB_MEM_ADDR(EP_DTB_READ(EP >> 1, ADDR_RX_OFFSET));
 563                                 break;
 564                         case USB_ENDPOINT_XFER_ISOC:
 565                                 LOG_ERR("%s: isochronous transfer not supported\n",
 566                                         __func__);
 567                                 /* Fallback to default */
 568                         default:
 569                                 ASSERT(0);
 570                                 return;
 571                         }
 572
 573                         if (Count > (epd->size - epd->offset))
 574                         {
 575                                 epd->status = BUFFER_OVERRUN;
 576                                 epd->size = ep_cnfg[EP].offset;
 577                                 break;
 578                         }
 579                         else if (Count < ep_cnfg[EP].max_size)
 580                         {
 581                                 epd->status = BUFFER_UNDERRUN;
 582                                 epd->size = ep_cnfg[EP].offset + Count;
 583                         }
 584                         else
 585                                 epd->status = BEGIN_SERVICED;
 586
 587                         Offset = epd->offset;
 588                         epd->offset += Count;
 589
 590                         /* Read data from packet memory buffer */
 591                         while (Count)
 592                         {
 593                                 Data = *pSrc++;
 594                                 *(epd->read_buffer + Offset++) = Data;
 595                                 if (--Count)
 596                                 {
 597                                         Data >>= 8;
 598                                         *(epd->read_buffer + Offset++) = Data;
 599                                         --Count;
 600                                 }
 601                         }
 602
 603                         ep_ctrl_set_stat_rx(epd->hw, EP_VALID);
 604
 605                         --ep_cnfg[EP].avail_data;
 606
 607                         if (*epd->hw & (1UL << 11))
 608                         {
 609                                 ep_cnfg[EP].status = SETUP_OVERWRITE;
 610                                 return;
 611                         }
 612                         if (!(Count = (epd->size - epd->offset)))
 613                         {
 614                                 epd->status = COMPLETE;
 615                                 break;
 616                         }
 617                 }
 618                 if (epd->status != BEGIN_SERVICED && epd->status != NO_SERVICED)
 619                 {
 620                         /* call callback function */
 621                         if (epd->complete)
 622                                 epd->complete(EP);
 623                 }
 624         }
 625 }
 626
 627 /*
 628  * Return the lower value from Host expected size and size and set a flag
 629  * STM32_USB_EP_ZERO_POSSIBLE when size is lower that host expected size.
 630  */
 631 static size_t usb_size(size_t size, size_t host_size)
 632 {
 633         if (size < host_size)
 634         {
 635                 ep_cnfg[CTRL_ENP_IN].flags |= STM32_USB_EP_ZERO_POSSIBLE;
 636                 return size;
 637         }
 638         return host_size;
 639 }
 640
 641 /* Configure an EP descriptor before performing a I/O operation */
 642 #define USB_EP_IO(__EP, __op, __buf, __size, __complete)                \
 643 ({                                                                      \
 644         cpu_flags_t flags;                                              \
 645         stm32_UsbIoStatus ret;                                  \
 646                                                                         \
 647         /* Fill EP descriptor */                                        \
 648         IRQ_SAVE_DISABLE(flags);                                        \
 649         if (__size < 0)                                                 \
 650         {                                                               \
 651                 ep_cnfg[__EP].status = NOT_READY;                       \
 652                 ep_cnfg[__EP].complete = NULL;                          \
 653                 ret = NOT_READY;                                        \
 654                 goto out;                                               \
 655         }                                                               \
 656         if (ep_cnfg[__EP].status == BEGIN_SERVICED)                     \
 657         {                                                               \
 658                 ret = NOT_READY;                                        \
 659                 goto out;                                               \
 660         }                                                               \
 661         /*                                                              \
 662          * NOTE: the write_buffer and read_buffer are actually the      \
 663          * same location in memory (it's a union).                      \
 664          *                                                              \
 665          * We have to do this trick to silent a build warning by        \
 666          * casting the I/O buffer to (void *) or (const void *).        \
 667          */                                                             \
 668         ep_cnfg[__EP].__op ## _buffer = __buf;                          \
 669         ep_cnfg[__EP].offset = 0;                                       \
 670         ep_cnfg[__EP].size = __size;                                    \
 671         ep_cnfg[__EP].complete = __complete;                            \
 672         if (!size)                                                      \
 673                 ep_cnfg[__EP].flags = STM32_USB_EP_ZERO_PACKET;         \
 674         else                                                            \
 675                 ep_cnfg[__EP].flags = 0;                                \
 676         ep_cnfg[__EP].status = NO_SERVICED;                             \
 677                                                                         \
 678         /* Perform the I/O operation */                                 \
 679         __usb_ep_io(__EP);                                              \
 680                                                                         \
 681         ret = ep_cnfg[__EP].status;                                     \
 682 out:                                                                    \
 683         IRQ_RESTORE(flags);                                             \
 684         ret;                                                            \
 685 })
 686
 687 /* Configure and endponint and perform a read operation */
 688 static stm32_UsbIoStatus
 689 __usb_ep_read(int ep, void *buffer, ssize_t size, void (*complete)(int))
 690 {
 691         if (UNLIKELY((ep >= EP_MAX_NUM) || (ep & 0x01)))
 692         {
 693                 LOG_ERR("%s: invalid EP number %d\n", __func__, ep);
 694                 ASSERT(0);
 695                 return STALLED;
 696         }
 697         if (UNLIKELY((size_t)buffer & 0x03))
 698         {
 699                 LOG_ERR("%s: unaligned buffer @ %p\n", __func__, buffer);
 700                 ASSERT(0);
 701                 return STALLED;
 702         }
 703         return USB_EP_IO(ep, read, buffer, size, complete);
 704 }
 705
 706 /* Configure and endponint and perform a write operation */
 707 static stm32_UsbIoStatus
 708 __usb_ep_write(int ep, const void *buffer, ssize_t size, void (*complete)(int))
 709 {
 710         if (UNLIKELY((ep >= EP_MAX_NUM) || !(ep & 0x01)))
 711         {
 712                 LOG_ERR("%s: invalid EP number %d\n", __func__, ep);
 713                 ASSERT(0);
 714                 return STALLED;
 715         }
 716         if (UNLIKELY((size_t)buffer & 0x03))
 717         {
 718                 LOG_ERR("%s: unaligned buffer @ %p\n", __func__, buffer);
 719                 ASSERT(0);
 720                 return STALLED;
 721         }
 722         return USB_EP_IO(ep, write, buffer, size, complete);
 723 }
 724
 725 static void usb_ep_low_level_config(int ep, uint16_t offset, uint16_t size)
 726 {
 727         stm32_UsbEp *epc = &ep_cnfg[ep];
 728
 729         /* IN EP */
 730         if (ep & 0x01)
 731         {
 732                 /* Disable EP */
 733                 ep_ctrl_set_stat_tx(epc->hw, EP_DISABLED);
 734                 /* Clear Tx toggle */
 735                 ep_ctrl_set_dtog_tx(epc->hw, 0);
 736                 /* Clear Correct Transfer for transmission flag */
 737                 ep_ctrl_clr_ctr_tx(epc->hw);
 738
 739                 /* Update EP description table */
 740                 EP_DTB_WRITE(ep >> 1, ADDR_TX_OFFSET, offset);
 741                 EP_DTB_WRITE(ep >> 1, COUNT_TX_OFFSET, 0);
 742         }
 743         /* OUT EP */
 744         else
 745         {
 746                 uint16_t rx_count = 0;
 747
 748                 /* Disable EP */
 749                 ep_ctrl_set_stat_rx(epc->hw, EP_DISABLED);
 750                 /* Clear Rx toggle */
 751                 ep_ctrl_set_dtog_rx(epc->hw, 0);
 752                 /* Clear Correct Transfer for reception flag */
 753                 ep_ctrl_clr_ctr_rx(epc->hw);
 754                 /* Descriptor block size field */
 755                 rx_count |= (size > 62) << 15;
 756                 /* Descriptor number of blocks field */
 757                 rx_count |= (((size > 62) ?  (size >> 5) - 1 : size >> 1) &
 758                                 0x1f) << 10;
 759                 /* Update EP description table */
 760                 EP_DTB_WRITE(ep >> 1, ADDR_RX_OFFSET, offset);
 761                 EP_DTB_WRITE(ep >> 1, COUNT_RX_OFFSET, rx_count);
 762         }
 763 }
 764
 765 /* Enable/Disable an endpoint */
 766 static int usb_ep_configure(const UsbEndpointDesc *epd, bool enable)
 767 {
 768         int EP;
 769         stm32_UsbEp *ep_hw;
 770         reg32_t *hw;
 771         uint16_t Offset;
 772         uint32_t size;
 773
 774         EP = usb_ep_logical_to_hw(epd->bEndpointAddress);
 775         ep_hw = &ep_cnfg[EP];
 776
 777         if (enable)
 778         {
 779                 /*
 780                  * Allocate packet memory for EP buffer/s calculate actual size
 781                  * only for the OUT EPs.
 782                  */
 783                 size = epd->wMaxPacketSize;
 784                 if (!usb_alloc_buffer(&Offset, &size, EP))
 785                         return -USB_MEMORY_FULL;
 786
 787                 /* Set EP status */
 788                 ep_hw->status  = NOT_READY;
 789                 /* Init EP flags */
 790                 ep_hw->flags = 0;
 791
 792                 /* Set endpoint type */
 793                 ep_hw->type = usb_endpointType(epd);
 794                 /* Init EP max packet size */
 795                 ep_hw->max_size = epd->wMaxPacketSize;
 796
 797                 if (EP & 0x01)
 798                         ep_hw->avail_data = 1;
 799                 else
 800                         ep_hw->avail_data = 0;
 801                 hw = (reg32_t *)&usb->EP0R;
 802                 hw += EP >> 1;
 803
 804                 /* Set Ep Address */
 805                 ep_ctrl_set_ea(hw, EP >> 1);
 806                 ep_hw->hw = hw;
 807                 LOG_INFO("%s: EP%d-%s configured\n",
 808                                 __func__, EP >> 1, EP & 1 ? "IN" : "OUT");
 809
 810                 /* Low-level endpoint configuration */
 811                 usb_ep_low_level_config(EP, Offset, size);
 812
 813                 /* Set EP Kind & enable */
 814                 switch (ep_hw->type)
 815                 {
 816                 case USB_ENDPOINT_XFER_CONTROL:
 817                         LOG_INFO("EP%d: CONTROL IN\n", EP >> 1);
 818                         ep_ctrl_set_ep_type(hw, EP_CTRL);
 819                         ep_ctrl_set_ep_kind(hw, 0);
 820                         break;
 821                 case USB_ENDPOINT_XFER_INT:
 822                         LOG_INFO("EP%d: INTERRUPT IN\n", EP >> 1);
 823                         ep_ctrl_set_ep_type(hw, EP_INTERRUPT);
 824                         ep_ctrl_set_ep_kind(hw, 0);
 825                         break;
 826                 case USB_ENDPOINT_XFER_BULK:
 827                         LOG_INFO("EP%d: BULK IN\n", EP >> 1);
 828                         ep_ctrl_set_ep_type(hw, EP_BULK);
 829                         ep_ctrl_set_ep_kind(hw, 0);
 830                         break;
 831                 case USB_ENDPOINT_XFER_ISOC:
 832                         LOG_ERR("EP%d: ISOCHRONOUS IN: not supported\n", EP >> 1);
 833                         /* Fallback to default */
 834                 default:
 835                         ASSERT(0);
 836                         return -USB_NODEV_ERROR;
 837                 }
 838                 if (EP & 0x01)
 839                 {
 840                         /* Enable EP */
 841                         ep_ctrl_set_stat_tx(hw, EP_NAK);
 842                         /* Clear Correct Transfer for transmission flag */
 843                         ep_ctrl_clr_ctr_tx(hw);
 844                 }
 845                 else
 846                 {
 847                         /* Enable EP */
 848                         ep_ctrl_set_stat_rx(hw, EP_VALID);
 849                 }
 850         }
 851         else if (ep_cnfg[EP].hw)
 852         {
 853                 hw = (reg32_t *)&usb->EP0R;
 854                 hw += EP >> 1;
 855
 856                 /* IN EP */
 857                 if (EP & 0x01)
 858                 {
 859                         /* Disable IN EP */
 860                         ep_ctrl_set_stat_tx(hw, EP_DISABLED);
 861                         /* Clear Correct Transfer for reception flag */
 862                         ep_ctrl_clr_ctr_tx(hw);
 863                 }
 864                 /* OUT EP */
 865                 else
 866                 {
 867                         /* Disable OUT EP */
 868                         ep_ctrl_set_stat_rx(hw, EP_DISABLED);
 869                         /* Clear Correct Transfer for reception flag */
 870                         ep_ctrl_clr_ctr_rx(hw);
 871                 }
 872                 /* Release buffer */
 873                 usb_free_buffer(EP);
 874                 ep_cnfg[EP].hw = NULL;
 875         }
 876         return 0;
 877 }
 878
 879 /* Get EP stall/unstall */
 880 static int usb_ep_get_stall(int EP, bool *pStall)
 881 {
 882         if (ep_cnfg[EP].hw == NULL)
 883                 return -USB_NODEV_ERROR;
 884
 885         *pStall = (EP & 0x01) ?
 886                 (ep_ctrl_get_stat_tx(ep_cnfg[EP].hw) == EP_STALL):  /* IN EP  */
 887                 (ep_ctrl_get_stat_rx(ep_cnfg[EP].hw) == EP_STALL);  /* OUT EP */
 888
 889         return USB_OK;
 890 }
 891
 892 /* Set EP stall/unstall */
 893 static int usb_ep_set_stall(int EP, bool Stall)
 894 {
 895         if (ep_cnfg[EP].hw == NULL)
 896                 return -USB_NODEV_ERROR;
 897
 898         if (Stall)
 899         {
 900                 ep_cnfg[EP].status = STALLED;
 901                 if (EP & 0x01)
 902                 {
 903                         /* IN EP */
 904                         ep_ctrl_set_stat_tx(ep_cnfg[EP].hw, EP_STALL);
 905                         ep_cnfg[EP].avail_data = 1;
 906                 }
 907                 else
 908                 {
 909                         /* OUT EP */
 910                         ep_ctrl_set_stat_rx(ep_cnfg[EP].hw, EP_STALL);
 911                         ep_cnfg[EP].avail_data = 0;
 912                 }
 913         }
 914         else
 915         {
 916                 ep_cnfg[EP].status = NOT_READY;
 917                 if(EP & 0x01)
 918                 {
 919                         /* IN EP */
 920                         ep_cnfg[EP].avail_data = 1;
 921                         /* reset Data Toggle bit */
 922                         ep_ctrl_set_dtog_tx(ep_cnfg[EP].hw, 0);
 923                         ep_ctrl_set_stat_tx(ep_cnfg[EP].hw, EP_NAK);
 924                 }
 925                 else
 926                 {
 927                         /* OUT EP */
 928                         ep_cnfg[EP].avail_data = 0;
 929                         /* reset Data Toggle bit */
 930                         ep_ctrl_set_dtog_rx(ep_cnfg[EP].hw, 0);
 931                         ep_ctrl_set_stat_rx(ep_cnfg[EP].hw, EP_VALID);
 932                 }
 933         }
 934         return USB_OK;
 935 }
 936
 937 /* Stall both directions of the control EP */
 938 static void usb_ep_set_stall_ctrl(void)
 939 {
 940         ep_cnfg[CTRL_ENP_IN].avail_data = 1;
 941         ep_cnfg[CTRL_ENP_IN].status = STALLED;
 942         ep_cnfg[CTRL_ENP_OUT].avail_data = 0;
 943         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
 944
 945         usb_ep_set_stall(CTRL_ENP_IN, true);
 946         usb_ep_set_stall(CTRL_ENP_OUT, true);
 947 }
 948
 949 /*
 950  * Find the position of an interface descriptor inside the configuration
 951  * descriptor.
 952  */
 953 static int usb_find_interface(uint32_t num, uint32_t alt)
 954 {
 955         const UsbInterfaceDesc *id;
 956         int i;
 957
 958         for (i = 0; ; i++)
 959         {
 960                 /* TODO: support more than one configuration per device */
 961                 id = (const UsbInterfaceDesc *)usb_dev->config[i];
 962                 if (id == NULL)
 963                         break;
 964                 if (id->bDescriptorType != USB_DT_INTERFACE)
 965                         continue;
 966                 if ((id->bInterfaceNumber == num) &&
 967                                 (id->bAlternateSetting == alt))
 968                         return i;
 969         }
 970         return -USB_NODEV_ERROR;
 971 }
 972
 973 /*
 974  * Configure/deconfigure EPs of a certain interface.
 975  */
 976 static void
 977 usb_configure_ep_interface(unsigned int num, unsigned int alt, bool enable)
 978 {
 979         const UsbEndpointDesc *epd;
 980         int i, start;
 981
 982         /*
 983          * Find the position of the interface descriptor (inside the
 984          * configuration descriptor).
 985          */
 986         start = usb_find_interface(num, alt);
 987         if (start < 0)
 988         {
 989                 LOG_ERR("%s: interface (%u,%u) not found\n",
 990                         __func__, num, alt);
 991                 return;
 992         }
 993         /*
 994          * Cycle over endpoint descriptors.
 995          *
 996          * NOTE: the first endpoint descriptor is placed next to the interface
 997          * descriptor, so we need to add +1 to the position of the interface
 998          * descriptor to find it.
 999          */
1000         for (i = start + 1; ; i++)
1001         {
1002                 epd = (const UsbEndpointDesc *)usb_dev->config[i];
1003                 if ((epd == NULL) || (epd->bDescriptorType == USB_DT_INTERFACE))
1004                         break;
1005                 if (epd->bDescriptorType != USB_DT_ENDPOINT)
1006                         continue;
1007                 if (UNLIKELY(usb_ep_configure(epd, enable) < 0))
1008                 {
1009                         LOG_ERR("%s: out of memory, can't initialize EP\n",
1010                                 __func__);
1011                         return;
1012                 }
1013         }
1014 }
1015
1016 /* Set device state */
1017 static void usb_set_device_state(int state)
1018 {
1019         unsigned int i;
1020
1021         LOG_INFO("%s: new state %d\n", __func__, state);
1022
1023         if (udc.state == USB_STATE_CONFIGURED)
1024         {
1025                 /* Deconfigure device */
1026                 for (i = 0; i < udc.interfaces; ++i)
1027                         usb_configure_ep_interface(i,
1028                                 udc.alt[i], false);
1029         }
1030         switch (state)
1031         {
1032         case USB_STATE_ATTACHED:
1033         case USB_STATE_POWERED:
1034         case USB_STATE_DEFAULT:
1035                 usb_set_address(0);
1036                 usb_dev->configured = false;
1037                 udc.address = udc.cfg_id = 0;
1038                 break;
1039         case USB_STATE_ADDRESS:
1040                 udc.cfg_id = 0;
1041                 break;
1042         case USB_STATE_CONFIGURED:
1043                 /* Configure device */
1044                 for (i = 0; i < udc.interfaces; ++i)
1045                         usb_configure_ep_interface(i,
1046                                 udc.alt[i], true);
1047                 break;
1048         default:
1049                 /* Unknown state: disconnected or connection in progress */
1050                 usb_dev->configured = false;
1051                 udc.address = 0;
1052                 udc.cfg_id = 0;
1053                 break;
1054         }
1055         udc.state = state;
1056 }
1057
1058 /* Setup packet: set address status phase end handler */
1059 static void usb_add_status_handler_end(UNUSED_ARG(int, EP))
1060 {
1061         uint16_t w_value;
1062
1063         w_value = usb_le16_to_cpu(setup_packet.wValue);
1064         udc.address = w_value & 0xff;
1065         usb_set_address(udc.address);
1066
1067         if (udc.address)
1068                 usb_set_device_state(USB_STATE_ADDRESS);
1069         else
1070                 usb_set_device_state(USB_STATE_DEFAULT);
1071
1072         __usb_ep_write(CTRL_ENP_IN, NULL, -1, NULL);
1073         __usb_ep_read(CTRL_ENP_OUT, NULL, -1, NULL);
1074 }
1075
1076 /* Prepare status phase */
1077 static void usb_status_phase(bool in)
1078 {
1079         if (in)
1080                 __usb_ep_write(CTRL_ENP_IN, NULL, 0, NULL);
1081 }
1082
1083 /* Setup packet: status phase end handler */
1084 static void usb_status_handler_end(UNUSED_ARG(int, EP))
1085 {
1086         __usb_ep_write(CTRL_ENP_IN, NULL, -1, NULL);
1087         __usb_ep_read(CTRL_ENP_OUT, NULL, -1, NULL);
1088 }
1089
1090 /* Address status handler */
1091 static void usb_status_handler(UNUSED_ARG(int, EP))
1092 {
1093         if (setup_packet.mRequestType & USB_DIR_IN)
1094         {
1095                 usb_status_phase(false);
1096                 ep_cnfg[CTRL_ENP_OUT].complete = usb_status_handler_end;
1097         }
1098         else
1099         {
1100                 usb_status_phase(true);
1101                 ep_cnfg[CTRL_ENP_IN].complete =
1102                         (setup_packet.bRequest == USB_REQ_SET_ADDRESS) ?
1103                                 usb_add_status_handler_end :
1104                                 usb_status_handler_end;
1105         }
1106 }
1107
1108 static void usb_endpointRead_complete(int ep)
1109 {
1110         if (UNLIKELY(ep >= EP_MAX_NUM))
1111         {
1112                 ASSERT(0);
1113                 return;
1114         }
1115         ASSERT(!(ep & 0x01));
1116
1117         event_do(&usb_event_done[ep >> 1]);
1118         rx_size = ep_cnfg[ep].size;
1119 }
1120
1121 ssize_t usb_endpointRead(int ep, void *buffer, ssize_t size)
1122 {
1123         int ep_num = usb_ep_logical_to_hw(ep);
1124         ssize_t max_size = sizeof(ep_buffer[ep_num]);
1125
1126         /* Non-blocking read for EP0 */
1127         if (ep_num == CTRL_ENP_OUT)
1128         {
1129                 size = usb_size(size, usb_le16_to_cpu(setup_packet.wLength));
1130                 if (UNLIKELY(size > max_size))
1131                 {
1132                         LOG_ERR("%s: ep_buffer exceeded, try to enlarge CONFIG_USB_BUFSIZE\n",
1133                                         __func__);
1134                         ASSERT(0);
1135                         return -USB_BUF_OVERFLOW;
1136                 }
1137                 if (!size)
1138                         usb_status_handler(ep_num);
1139                 else
1140                 {
1141                         __usb_ep_read(ep_num, ep_buffer[ep_num], size,
1142                                         usb_status_handler);
1143                         memcpy(buffer, ep_buffer[ep_num], size);
1144                 }
1145                 return size;
1146         }
1147         if (UNLIKELY(!size))
1148                 return 0;
1149         size = MIN(size, max_size);
1150         event_initGeneric(&usb_event_done[ep_num >> 1]);
1151         rx_size = 0;
1152
1153         /* Blocking read */
1154         __usb_ep_read(ep_num, ep_buffer[ep_num], size,
1155                                 usb_endpointRead_complete);
1156         event_wait(&usb_event_done[ep_num >> 1]);
1157         memcpy(buffer, ep_buffer[ep_num], rx_size);
1158
1159         return rx_size;
1160 }
1161
1162 static void usb_endpointWrite_complete(int ep)
1163 {
1164         if (UNLIKELY(ep >= EP_MAX_NUM))
1165         {
1166                 ASSERT(0);
1167                 return;
1168         }
1169         ASSERT(ep & 0x01);
1170
1171         event_do(&usb_event_done[ep >> 1]);
1172         tx_size = ep_cnfg[ep].size;
1173 }
1174
1175 ssize_t usb_endpointWrite(int ep, const void *buffer, ssize_t size)
1176 {
1177         int ep_num = usb_ep_logical_to_hw(ep);
1178         ssize_t max_size = sizeof(ep_buffer[ep_num]);
1179
1180         /* Non-blocking write for EP0 */
1181         if (ep_num == CTRL_ENP_IN)
1182         {
1183                 size = usb_size(size, usb_le16_to_cpu(setup_packet.wLength));
1184                 if (UNLIKELY(size > max_size))
1185                 {
1186                         LOG_ERR("%s: ep_buffer exceeded, try to enlarge CONFIG_USB_BUFSIZE\n",
1187                                         __func__);
1188                         ASSERT(0);
1189                         return -USB_BUF_OVERFLOW;
1190                 }
1191                 if (!size)
1192                         usb_status_handler(ep_num);
1193                 else
1194                 {
1195                         memcpy(ep_buffer[ep_num], buffer, size);
1196                         __usb_ep_write(ep_num, ep_buffer[ep_num], size,
1197                                         usb_status_handler);
1198                 }
1199                 return size;
1200         }
1201         if (UNLIKELY(!size))
1202                 return 0;
1203         size = MIN(size, max_size);
1204         event_initGeneric(&usb_event_done[ep_num >> 1]);
1205         tx_size = 0;
1206
1207         /* Blocking write */
1208         memcpy(ep_buffer[ep_num], buffer, size);
1209         __usb_ep_write(ep_num, ep_buffer[ep_num], size,
1210                                 usb_endpointWrite_complete);
1211         event_wait(&usb_event_done[ep_num >> 1]);
1212
1213         return tx_size;
1214 }
1215
1216 /* Global variable to handle the following non-blocking I/O operations */
1217 static uint32_t InData;
1218
1219 /* Get device status */
1220 static int usb_send_device_status(uint16_t index)
1221 {
1222         if (index)
1223                 return -USB_NODEV_ERROR;
1224
1225         InData = ((uint32_t)udc.feature) & 0xff;
1226         __usb_ep_write(CTRL_ENP_IN,
1227                         (uint8_t *)&InData, sizeof(uint16_t),
1228                         usb_status_handler);
1229         return 0;
1230 }
1231
1232 /* Get interface status */
1233 static int usb_send_interface_status(UNUSED_ARG(uint16_t, index))
1234 {
1235         InData = 0;
1236         __usb_ep_write(CTRL_ENP_IN,
1237                         (uint8_t *)&InData, sizeof(uint16_t),
1238                         usb_status_handler);
1239         return 0;
1240 }
1241
1242 /* Get endpoint status */
1243 static int usb_send_ep_status(uint16_t index)
1244 {
1245         if ((index & 0x7F) > 16)
1246                 return -USB_NODEV_ERROR;
1247
1248         InData = 0;
1249         usb_ep_get_stall(usb_ep_logical_to_hw(index), (bool *)&InData);
1250         __usb_ep_write(CTRL_ENP_IN,
1251                         (uint8_t *)&InData, sizeof(uint16_t),
1252                         usb_status_handler);
1253         return 0;
1254 }
1255
1256 /* USB setup packet: GET_STATUS request handler */
1257 static void usb_get_status_handler(void)
1258 {
1259         uint16_t w_value = usb_le16_to_cpu(setup_packet.wValue);
1260         uint16_t w_index = usb_le16_to_cpu(setup_packet.wIndex);
1261         uint16_t w_length = usb_le16_to_cpu(setup_packet.wLength);
1262
1263         /* GET_STATUS sanity checks */
1264         if (udc.state < USB_STATE_ADDRESS)
1265         {
1266                 LOG_WARN("%s: bad GET_STATUS request (State=%02x)\n",
1267                                 __func__, udc.state);
1268                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1269                 return;
1270         }
1271         if (w_length != 2)
1272         {
1273                 LOG_WARN("%s: bad GET_STATUS request (wLength.Word=%02x)\n",
1274                                 __func__, w_length);
1275                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1276                 return;
1277         }
1278         if (!(setup_packet.mRequestType & USB_DIR_IN))
1279         {
1280                 LOG_WARN("%s: bad GET_STATUS request (mRequestType=%02x)\n",
1281                                 __func__, setup_packet.mRequestType);
1282                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1283                 return;
1284         }
1285         if (w_value)
1286         {
1287                 LOG_WARN("%s: bad GET_STATUS request (wValue=%02x)\n",
1288                                 __func__, w_value);
1289                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1290                 return;
1291         }
1292
1293         /* Process GET_STATUS request */
1294         switch (setup_packet.mRequestType & USB_RECIP_MASK)
1295         {
1296         case USB_RECIP_DEVICE:
1297                 if (usb_send_device_status(w_index) < 0)
1298                 {
1299                         LOG_WARN("%s: GET_STATUS: invalid UsbRecipientDevice\n",
1300                                         __func__);
1301                         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1302                         return;
1303                 }
1304                 LOG_INFO("%s: GET_STATUS: mRequestType=%02x (UsbRecipientDevice)\n",
1305                                 __func__, setup_packet.mRequestType);
1306                 break;
1307         case USB_RECIP_INTERFACE:
1308                 if (usb_send_interface_status(w_index) < 0)
1309                 {
1310                         LOG_WARN("%s: GET_STATUS: invalid UsbRecipientInterface\n",
1311                                         __func__);
1312                         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1313                         return;
1314                 }
1315                 LOG_INFO("%s: GET_STATUS: mRequestType=%02x (UsbRecipientInterface)\n",
1316                                 __func__, setup_packet.mRequestType);
1317                 break;
1318         case USB_RECIP_ENDPOINT:
1319                 if (usb_send_ep_status(w_index) < 0)
1320                 {
1321                         LOG_WARN("%s: GET_STATUS: invalid UsbRecipientEndpoint\n",
1322                                         __func__);
1323                         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1324                         return;
1325                 }
1326                 LOG_INFO("%s: GET_STATUS: mRequestType=%02x (UsbRecipientEndpoint)\n",
1327                                 __func__, setup_packet.mRequestType);
1328                 break;
1329         default:
1330                 LOG_WARN("%s: GET_STATUS: invalid UsbRecipientEndpoint\n",
1331                                 __func__);
1332                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1333                 break;
1334         }
1335 }
1336
1337 static int usb_get_device_descriptor(int id)
1338 {
1339         if (id)
1340                 return -USB_NODEV_ERROR;
1341
1342         usb_dev->device->bMaxPacketSize0 = USB_EP0_MAX_SIZE;
1343         __usb_ep_write(CTRL_ENP_IN, (const uint8_t *)usb_dev->device,
1344                         usb_size(usb_dev->device->bLength,
1345                                 usb_le16_to_cpu(setup_packet.wLength)),
1346                         usb_status_handler);
1347         return 0;
1348 }
1349
1350 /*
1351  * TODO: refactor this part to remove this temporary buffer.
1352  *
1353  * It would be better to define all the USB descriptors in the right order and
1354  * send them as a contiguous buffer directly from the flash / rodata memory.
1355  */
1356 #define USB_BUFSIZE (128)
1357 static uint8_t usb_cfg_buffer[USB_BUFSIZE];
1358 STATIC_ASSERT(USB_BUFSIZE < (1 << (sizeof(uint16_t) * 8)));
1359
1360 static int usb_get_configuration_descriptor(int id)
1361 {
1362         const UsbConfigDesc **config =
1363                         (const UsbConfigDesc **)usb_dev->config;
1364         uint8_t *p = usb_cfg_buffer;
1365         int i;
1366
1367         /* TODO: support more than one configuration per device */
1368         if (UNLIKELY(id > 0))
1369                 return -USB_NODEV_ERROR;
1370
1371         for (i = 0; config[i]; i++)
1372         {
1373                 memcpy(p, config[i], config[i]->bLength);
1374                 p += config[i]->bLength;
1375
1376                 if (UNLIKELY((p - usb_cfg_buffer) > USB_BUFSIZE))
1377                 {
1378                         ASSERT(0);
1379                         return -USB_BUF_OVERFLOW;
1380                 }
1381         }
1382         ((UsbConfigDesc *)usb_cfg_buffer)->wTotalLength =
1383                         usb_cpu_to_le16((uint16_t)(p - usb_cfg_buffer));
1384         __usb_ep_write(CTRL_ENP_IN,
1385                         usb_cfg_buffer,
1386                         usb_size(p - usb_cfg_buffer,
1387                                 usb_le16_to_cpu(setup_packet.wLength)),
1388                         usb_status_handler);
1389         return 0;
1390 }
1391
1392 static int usb_get_string_descriptor(unsigned int id)
1393 {
1394         const UsbStringDesc *lang_str;
1395         unsigned int lang_id, str_id;
1396         uint16_t w_index_lo = usb_le16_to_cpu(setup_packet.wIndex) & 0x00ff;
1397         uint16_t w_index_hi = (usb_le16_to_cpu(setup_packet.wIndex) &
1398                                                 0xff00) >> 8;
1399
1400         ASSERT(usb_dev->strings != NULL);
1401         ASSERT(usb_dev->strings[0] != NULL);
1402
1403         lang_str = usb_dev->strings[0];
1404         if (id)
1405         {
1406                 /* Find Language index */
1407                 for (lang_id = 0; ; lang_id++)
1408                 {
1409                         const UsbStringDesc *str =
1410                                                 usb_dev->strings[lang_id];
1411                         if (UNLIKELY(str == NULL))
1412                                 return -USB_NODEV_ERROR;
1413                         if ((str->data[0] == w_index_lo) &&
1414                                         (str->data[1] == w_index_hi))
1415                                 break;
1416                 }
1417                 /* Check buffer overflow to find string index */
1418                 for (str_id = 0; str_id < id; str_id++)
1419                 {
1420                         lang_str = usb_dev->strings[lang_id + 1 + str_id];
1421                         if (lang_str == NULL)
1422                                 return -USB_NODEV_ERROR;
1423                 }
1424         }
1425         __usb_ep_write(CTRL_ENP_IN,
1426                         lang_str,
1427                         usb_size(lang_str->bLength,
1428                                 usb_le16_to_cpu(setup_packet.wLength)),
1429                         usb_status_handler);
1430         return 0;
1431 }
1432
1433 static void usb_get_descriptor(void)
1434 {
1435         uint16_t w_value_lo = usb_le16_to_cpu(setup_packet.wValue) & 0x00ff;
1436         uint16_t w_value_hi = (usb_le16_to_cpu(setup_packet.wValue) & 0xff00) >> 8;
1437
1438         if (udc.state < USB_STATE_DEFAULT)
1439         {
1440                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1441                 return;
1442         }
1443         switch (w_value_hi)
1444         {
1445         case USB_DT_DEVICE:
1446                 LOG_INFO("%s: GET_DEVICE_DESCRIPTOR: id=%d, state=%d\n",
1447                                 __func__,
1448                                 w_value_lo,
1449                                 udc.state);
1450                 if (usb_get_device_descriptor(w_value_lo) < 0)
1451                         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1452                 break;
1453         case USB_DT_CONFIG:
1454                 LOG_INFO("%s: GET_CONFIG_DESCRIPTOR: id=%d, state=%d\n",
1455                                 __func__, w_value_lo, udc.state);
1456                 if (usb_get_configuration_descriptor(w_value_lo) < 0)
1457                         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1458                 break;
1459         case USB_DT_STRING:
1460                 LOG_INFO("%s: GET_STRING_DESCRIPTOR: id=%d, state=%d\n",
1461                                 __func__, w_value_lo, udc.state);
1462                 if (usb_get_string_descriptor(w_value_lo) < 0)
1463                         ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1464                 break;
1465         default:
1466                 LOG_WARN("%s: GET_UNKNOWN_DESCRIPTOR: id=%d, state=%d\n",
1467                                 __func__, w_value_lo, udc.state);
1468                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1469                 break;
1470         }
1471 }
1472
1473 /* USB setup packet: class/vendor request handler */
1474 static void usb_event_handler(UsbDevice *dev)
1475 {
1476         /*
1477          * TODO: get the appropriate usb_dev in function of the endpoint
1478          * address.
1479          */
1480         if (dev->event_cb)
1481                 dev->event_cb(&setup_packet);
1482 }
1483
1484 /* USB setup packet: GET_DESCRIPTOR handler */
1485 static void usb_get_descriptor_handler(void)
1486 {
1487         LOG_INFO("%s: GET_DESCRIPTOR: RECIP = %d\n",
1488                         __func__,
1489                         setup_packet.mRequestType & USB_RECIP_MASK);
1490         if ((setup_packet.mRequestType & USB_RECIP_MASK) ==
1491                         USB_RECIP_DEVICE)
1492                 usb_get_descriptor();
1493         /* Getting descriptor for a device is a standard request */
1494         else if ((setup_packet.mRequestType & USB_DIR_MASK) == USB_DIR_IN)
1495                 usb_event_handler(usb_dev);
1496         else
1497                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1498 }
1499
1500 /* USB setup packet: SET_ADDRESS handler */
1501 static void usb_set_address_handler(void)
1502 {
1503         uint16_t w_value = usb_le16_to_cpu(setup_packet.wValue);
1504         uint16_t w_index = usb_le16_to_cpu(setup_packet.wIndex);
1505         uint16_t w_length = usb_le16_to_cpu(setup_packet.wLength);
1506
1507         LOG_INFO("%s: SET_ADDRESS: %d\n",
1508                         __func__, usb_le16_to_cpu(setup_packet.wValue));
1509         if ((udc.state >= USB_STATE_DEFAULT) &&
1510                         ((setup_packet.mRequestType & USB_RECIP_MASK) ==
1511                                         USB_RECIP_DEVICE) &&
1512                         (w_index == 0) && (w_length == 0) && (w_value < 128))
1513                 usb_status_handler(CTRL_ENP_IN);
1514         else
1515                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1516 }
1517
1518 /* USB setup packet: GET_CONFIGURATION handler */
1519 static void usb_get_config_handler(void)
1520 {
1521         uint16_t w_value = usb_le16_to_cpu(setup_packet.wValue);
1522         uint16_t w_index = usb_le16_to_cpu(setup_packet.wIndex);
1523
1524         LOG_INFO("%s: GET_CONFIGURATION\n", __func__);
1525         if ((udc.state >= USB_STATE_ADDRESS) &&
1526                         (w_value == 0) && (w_index == 0) && (w_value == 1))
1527         {
1528                 InData = udc.cfg_id;
1529                 __usb_ep_write(CTRL_ENP_IN, (uint8_t *)&InData, 1, usb_status_handler);
1530         }
1531         else
1532                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1533 }
1534
1535 static const UsbConfigDesc *usb_find_configuration(int num)
1536 {
1537         const UsbConfigDesc *cfg;
1538         int i;
1539
1540         for (i = 0; ; i++)
1541         {
1542                 cfg = (const UsbConfigDesc *)usb_dev->config[i];
1543                 if (cfg == NULL)
1544                         break;
1545                 if (cfg->bDescriptorType != USB_DT_CONFIG)
1546                         continue;
1547                 if (cfg->bConfigurationValue == num)
1548                         return cfg;
1549         }
1550         return NULL;
1551 }
1552
1553 static int usb_set_config_state(uint32_t conf)
1554 {
1555         const UsbConfigDesc *pCnfg;
1556         unsigned int i;
1557
1558         if (conf)
1559         {
1560                 /* Find configuration descriptor */
1561                 pCnfg = usb_find_configuration(conf);
1562                 if (pCnfg == NULL)
1563                         return -USB_NODEV_ERROR;
1564
1565                 /* Reset current configuration */
1566                 usb_set_device_state(USB_STATE_ADDRESS);
1567                 usb_dev->configured = false;
1568                 udc.cfg = pCnfg;
1569
1570                 /* Set Interface and Alternative Setting */
1571                 udc.cfg_id = conf;
1572                 /* Set self-powered state */
1573                 if (pCnfg->bmAttributes & USB_CONFIG_ATT_SELFPOWER)
1574                         udc.feature |= STM32_UDC_FEATURE_SELFPOWERED;
1575
1576                 /* Configure all existing interfaces to alternative setting 0 */
1577                 ASSERT(pCnfg->bNumInterfaces <= USB_MAX_INTERFACE);
1578                 udc.interfaces = pCnfg->bNumInterfaces;
1579                 for (i = 0; i < udc.interfaces; i++)
1580                         udc.alt[i] = 0;
1581                 usb_set_device_state(USB_STATE_CONFIGURED);
1582                 usb_dev->configured = true;
1583                 event_do(&usb_event_done[0]);
1584                 LOG_INFO("%s: device configured\n", __func__);
1585         }
1586         else
1587         {
1588                 usb_dev->configured = false;
1589                 usb_set_device_state(USB_STATE_ADDRESS);
1590         }
1591         return 0;
1592 }
1593
1594 /* USB setup packet: SET_CONFIGURATION handler */
1595 static void usb_set_config_handler(void)
1596 {
1597         uint16_t w_value = usb_le16_to_cpu(setup_packet.wValue);
1598         uint16_t w_index = usb_le16_to_cpu(setup_packet.wIndex);
1599         uint16_t w_length = usb_le16_to_cpu(setup_packet.wLength);
1600
1601         LOG_INFO("%s: SET_CONFIGURATION: %d\n",
1602                         __func__, w_value);
1603         if ((udc.state >= USB_STATE_ADDRESS) &&
1604                         (w_index == 0) && (w_length == 0) &&
1605                         (usb_set_config_state(w_value & 0xff) == 0))
1606                 usb_status_handler(CTRL_ENP_OUT);
1607         else
1608                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1609 }
1610
1611 /* USB setup packet: standard request handler */
1612 static void usb_standard_request_handler(void)
1613 {
1614         switch (setup_packet.bRequest)
1615         {
1616         case USB_REQ_GET_STATUS:
1617                 usb_get_status_handler();
1618                 break;
1619         case USB_REQ_CLEAR_FEATURE:
1620                 LOG_INFO("%s: bRequest=%d (CLEAR_FEATURE)\n",
1621                                 __func__, setup_packet.bRequest);
1622                 break;
1623         case USB_REQ_SET_FEATURE:
1624                 LOG_INFO("%s: bRequest=%d (SET_FEATURE)\n",
1625                                 __func__, setup_packet.bRequest);
1626                 break;
1627         case USB_REQ_SET_ADDRESS:
1628                 usb_set_address_handler();
1629                 break;
1630         case USB_REQ_GET_DESCRIPTOR:
1631                 usb_get_descriptor_handler();
1632                 break;
1633         case USB_REQ_SET_DESCRIPTOR:
1634                 LOG_INFO("%s: bRequest=%d (SET_DESCRIPTOR)\n",
1635                                 __func__, setup_packet.bRequest);
1636                 break;
1637         case USB_REQ_GET_CONFIGURATION:
1638                 usb_get_config_handler();
1639                 break;
1640         case USB_REQ_SET_CONFIGURATION:
1641                 usb_set_config_handler();
1642                 break;
1643         case USB_REQ_GET_INTERFACE:
1644                 LOG_INFO("%s: bRequest=%d (GET_INTERFACE)\n",
1645                                 __func__, setup_packet.bRequest);
1646                 break;
1647         case USB_REQ_SET_INTERFACE:
1648                 LOG_INFO("%s: bRequest=%d (SET_INTERFACE)\n",
1649                                 __func__, setup_packet.bRequest);
1650                 break;
1651         case USB_REQ_SYNCH_FRAME:
1652                 LOG_INFO("%s: bRequest=%d (SYNCH_FRAME)\n",
1653                                 __func__, setup_packet.bRequest);
1654                 break;
1655         default:
1656                 LOG_WARN("%s: bRequest=%d (Unknown)\n",
1657                                 __func__, setup_packet.bRequest);
1658                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1659                 break;
1660         }
1661 }
1662
1663 /* USB setup packet handler */
1664 static void usb_setup_handler(void)
1665 {
1666         switch (setup_packet.mRequestType & USB_TYPE_MASK)
1667         {
1668         /* Standard */
1669         case USB_TYPE_STANDARD:
1670                 LOG_INFO("%s: bmRequestType=%02x (Standard)\n",
1671                                 __func__, setup_packet.mRequestType);
1672                 usb_standard_request_handler();
1673                 break;
1674         /* Class */
1675         case USB_TYPE_CLASS:
1676                 LOG_INFO("%s: bmRequestType=%02x (Class)\n",
1677                                 __func__, setup_packet.mRequestType);
1678                 usb_event_handler(usb_dev);
1679                 break;
1680         /* Vendor */
1681         case USB_TYPE_VENDOR:
1682                 LOG_INFO("%s: bmRequestType=%02x (Vendor)\n",
1683                                 __func__, setup_packet.mRequestType);
1684                 usb_event_handler(usb_dev);
1685                 break;
1686         case USB_TYPE_RESERVED:
1687                 LOG_INFO("%s: bmRequestType=%02x (Reserved)\n",
1688                                 __func__, setup_packet.mRequestType);
1689                 break;
1690         /* Other */
1691         default:
1692                 LOG_WARN("%s: bmRequestType=%02x (Unknown)\n",
1693                                 __func__, setup_packet.mRequestType);
1694                 ep_cnfg[CTRL_ENP_OUT].status = STALLED;
1695                 break;
1696         }
1697 }
1698
1699 /* USB: low-level hardware initialization */
1700 static void usb_hw_reset(void)
1701 {
1702         unsigned int i;
1703         int ret;
1704
1705         /* Initialize endpoint descriptors */
1706         for (i = 0; i < countof(ep_cnfg); i++)
1707                 ep_cnfg[i].hw = NULL;
1708
1709         /* Initialize USB memory */
1710         for (i = 0; i < countof(memory_buffer); i++)
1711                 memory_buffer[i].Size = 0;
1712         usb->BTABLE = USB_BDT_OFFSET;
1713         mem_use = NULL;
1714
1715         /* Endpoint initialization */
1716         ret = usb_ep_configure(&USB_CtrlEpDescr0, true);
1717         if (UNLIKELY(ret < 0))
1718         {
1719                 LOG_WARN("%s: out of memory, cannot initialize EP0\n",
1720                                 __func__);
1721                 return;
1722         }
1723         ret = usb_ep_configure(&USB_CtrlEpDescr1, true);
1724         if (UNLIKELY(ret < 0))
1725         {
1726                 LOG_WARN("%s: out of memory, cannot initialize EP1\n",
1727                                 __func__);
1728                 return;
1729         }
1730
1731         /* Set default address */
1732         usb_set_address(0);
1733
1734         /* Enable all the device interrupts */
1735         usb->CNTR = bmCTRM | bmRESETM | bmSOFM | bmERRM | bmPMAOVRM |
1736                         bmSUSPM | bmWKUPM;
1737 }
1738
1739 /* Handle a correct transfer under ISR */
1740 static void usb_isr_correct_transfer(stm32_usb_irq_status_t interrupt)
1741 {
1742         int EP;
1743         reg32_t *pReg = (reg32_t *)&usb->EP0R;
1744
1745         /* Find corresponding EP */
1746         pReg += interrupt.EP_ID;
1747         EP = (int)(((*pReg & 0x0f) << 1) + (interrupt.DIR ? 0 : 1));
1748         ep_cnfg[EP].avail_data = 1;
1749
1750         ASSERT(ep_cnfg[EP].hw);
1751         /* IN EP */
1752         if (EP & 0x01)
1753                 ep_ctrl_clr_ctr_tx(ep_cnfg[EP].hw);
1754         else
1755                 ep_ctrl_clr_ctr_rx(ep_cnfg[EP].hw);
1756         if (EP == CTRL_ENP_OUT)
1757         {
1758                 /* Determinate type of packet (only for control EP) */
1759                 bool SetupPacket = ep_ctrl_get_setup(ep_cnfg[CTRL_ENP_OUT].hw);
1760
1761                 if (SetupPacket)
1762                 {
1763                         ep_cnfg[CTRL_ENP_IN].avail_data = 1;
1764                         /* init IO to receive Setup packet */
1765                         __usb_ep_write(CTRL_ENP_IN, NULL, -1, NULL);
1766                         __usb_ep_read(CTRL_ENP_OUT, &setup_packet,
1767                                         sizeof(setup_packet), NULL);
1768
1769                         /* reset EP IO ctrl */
1770                         if (setup_packet.mRequestType & USB_DIR_IN)
1771                                 usb_status_handler(CTRL_ENP_OUT);
1772                         usb_setup_handler();
1773                         if (ep_cnfg[CTRL_ENP_OUT].status == STALLED)
1774                                 usb_ep_set_stall_ctrl();
1775                 }
1776                 else
1777                 {
1778                         if (ep_cnfg[CTRL_ENP_OUT].complete &&
1779                                         setup_packet.mRequestType & USB_DIR_IN)
1780                                 ep_cnfg[CTRL_ENP_OUT].complete(CTRL_ENP_OUT);
1781                         else
1782                                 __usb_ep_io(EP);
1783                 }
1784         }
1785         else if (EP == CTRL_ENP_IN)
1786         {
1787                 if (ep_cnfg[CTRL_ENP_IN].complete &&
1788                                 !(setup_packet.mRequestType & USB_DIR_IN))
1789                         ep_cnfg[CTRL_ENP_IN].complete(CTRL_ENP_IN);
1790                 else
1791                         __usb_ep_io(EP);
1792
1793         }
1794         else
1795                 __usb_ep_io(EP);
1796 }
1797
1798 /* USB: interrupt service routine */
1799 static void usb_isr(void)
1800 {
1801         stm32_usb_irq_status_t interrupt;
1802
1803         /* Get masked interrupt flags */
1804         interrupt.status = usb->ISTR;
1805         interrupt.status &= usb->CNTR | 0x1f;
1806
1807         if (interrupt.PMAOVR)
1808         {
1809                 LOG_WARN("%s: DMA overrun / underrun\n", __func__);
1810                 usb->ISTR = ~bmPMAOVRM;
1811         }
1812         if (interrupt.ERR)
1813         {
1814                 LOG_WARN("%s: engine error\n", __func__);
1815                 usb->ISTR = ~bmERRM;
1816         }
1817         if (interrupt.RESET)
1818         {
1819                 LOG_INFO("%s: device reset\n", __func__);
1820                 usb->ISTR = ~bmRESETM;
1821                 usb_hw_reset();
1822                 usb_set_device_state(USB_STATE_DEFAULT);
1823         }
1824         if (interrupt.SOF)
1825         {
1826 #if 0
1827                 /*
1828                  * XXX: disable logging of frame interrupts (too much noise!)
1829                  */
1830                 uint16_t frame_nr = usb->FNR & 0x0fff;
1831                 LOG_INFO("%s: frame %#x\n", __func__, frame_nr);
1832 #endif
1833                 usb->ISTR = ~bmSOFM;
1834         }
1835         if (interrupt.WKUP)
1836         {
1837                 LOG_INFO("%s: wake-up\n", __func__);
1838                 usb->ISTR = ~(bmSUSPM | bmWKUPM);
1839                 usb_resume();
1840         }
1841         if (interrupt.SUSP)
1842         {
1843                 LOG_INFO("%s: suspend\n", __func__);
1844                 usb_suspend();
1845                 usb->ISTR = ~(bmSUSPM | bmWKUPM);
1846         }
1847         if (interrupt.ESOF)
1848         {
1849                 LOG_INFO("%s: expected frame\n", __func__);
1850                 usb->ISTR = ~bmESOFM;
1851         }
1852         if (interrupt.CTR)
1853         {
1854                 usb_isr_correct_transfer(interrupt);
1855         }
1856 }
1857
1858 /* USB: hardware initialization */
1859 static void usb_hw_init(void)
1860 {
1861         /* Enable clocking on the required GPIO pins */
1862         RCC->APB2ENR |= RCC_APB2_GPIOA | RCC_APB2_GPIOC;
1863
1864         /* Make sure that the CAN controller is disabled and held in reset */
1865         RCC->APB1ENR &= ~RCC_APB1_CAN;
1866
1867         /* Configure USB_DM and USB_DP to work as USB lines */
1868         stm32_gpioPinConfig((struct stm32_gpio *)GPIOA_BASE,
1869                         USB_DM_PIN | USB_DP_PIN,
1870                         GPIO_MODE_AF_PP, GPIO_SPEED_50MHZ);
1871         /* Configure USB_DISC to work as USB disconnect */
1872         stm32_gpioPinConfig((struct stm32_gpio *)GPIOC_BASE,
1873                         USB_DISC_PIN,
1874                         GPIO_MODE_OUT_PP, GPIO_SPEED_50MHZ);
1875         stm32_gpioPinWrite((struct stm32_gpio *)GPIOC_BASE,
1876                                 USB_DISC_PIN, 1);
1877
1878         /* Ensure the USB clock is disabled before setting the prescaler */
1879         RCC->APB1ENR &= ~RCC_APB1_USB;
1880
1881         /* Configure USB clock (48MHz) */
1882         *CFGR_USBPRE_BB &= ~RCC_USBCLK_PLLCLK_1DIV5;
1883
1884         /* Activate USB clock */
1885         RCC->APB1ENR |= RCC_APB1_USB;
1886
1887         /* Force USB reset and disable USB interrupts */
1888         usb->CNTR = bmFRES;
1889         timer_delayHp(1);
1890
1891         /* Issue a USB reset */
1892         usb_hw_reset();
1893
1894         /* Clear spurious pending interrupt */
1895         usb->ISTR = 0;
1896
1897         /* Register interrupt handler */
1898         sysirq_setHandler(USB_LP_CAN_RX0_IRQHANDLER, usb_isr);
1899
1900         /* Software connection enable */
1901         usb_connect();
1902 }
1903
1904 /* Initialize the USB controller */
1905 static void usb_init(void)
1906 {
1907         udc.state = USB_STATE_NOTATTACHED;
1908         udc.feature = 0;
1909
1910         usb_hw_init();
1911 }
1912
1913 /* Register an upper layer USB device into the driver */
1914 int usb_deviceRegister(UsbDevice *dev)
1915 {
1916 #if CONFIG_KERN
1917         MOD_CHECK(proc);
1918 #endif
1919         usb_dev = dev;
1920         usb_dev->configured = false;
1921
1922         event_initGeneric(&usb_event_done[0]);
1923         usb_init();
1924         event_wait(&usb_event_done[0]);
1925
1926         return 0;
1927 }