git.sur5r.net Git - u-boot/blob - drivers/usb/gadget/f_sdp.c

   1 /*
   2  * f_sdp.c -- USB HID Serial Download Protocol
   3  *
   4  * Copyright (C) 2017 Toradex
   5  * Author: Stefan Agner <stefan.agner@toradex.com>
   6  *
   7  * This file implements the Serial Download Protocol (SDP) as specified in
   8  * the i.MX 6 Reference Manual. The SDP is a USB HID based protocol and
   9  * allows to download images directly to memory. The implementation
  10  * works with the imx_loader (imx_usb) USB client software on host side.
  11  *
  12  * Not all commands are implemented, e.g. WRITE_REGISTER, DCD_WRITE and
  13  * SKIP_DCD_HEADER are only stubs.
  14  *
  15  * Parts of the implementation are based on f_dfu and f_thor.
  16  *
  17  * SPDX-License-Identifier:     GPL-2.0+
  18  */
  19
  20 #include <errno.h>
  21 #include <common.h>
  22 #include <console.h>
  23 #include <malloc.h>
  24
  25 #include <linux/usb/ch9.h>
  26 #include <linux/usb/gadget.h>
  27 #include <linux/usb/composite.h>
  28
  29 #include <asm/io.h>
  30 #include <g_dnl.h>
  31 #include <sdp.h>
  32 #include <spl.h>
  33 #include <image.h>
  34 #include <imximage.h>
  35
  36 #define HID_REPORT_ID_MASK      0x000000ff
  37
  38 /*
  39  * HID class requests
  40  */
  41 #define HID_REQ_GET_REPORT              0x01
  42 #define HID_REQ_GET_IDLE                0x02
  43 #define HID_REQ_GET_PROTOCOL            0x03
  44 #define HID_REQ_SET_REPORT              0x09
  45 #define HID_REQ_SET_IDLE                0x0A
  46 #define HID_REQ_SET_PROTOCOL            0x0B
  47
  48 #define HID_USAGE_PAGE_LEN              76
  49
  50 struct hid_report {
  51         u8 usage_page[HID_USAGE_PAGE_LEN];
  52 } __packed;
  53
  54 #define SDP_READ_REGISTER       0x0101
  55 #define SDP_WRITE_REGISTER      0x0202
  56 #define SDP_WRITE_FILE          0x0404
  57 #define SDP_ERROR_STATUS        0x0505
  58 #define SDP_DCD_WRITE           0x0a0a
  59 #define SDP_JUMP_ADDRESS        0x0b0b
  60 #define SDP_SKIP_DCD_HEADER     0x0c0c
  61
  62 #define SDP_SECURITY_CLOSED             0x12343412
  63 #define SDP_SECURITY_OPEN               0x56787856
  64
  65 #define SDP_WRITE_FILE_COMPLETE         0x88888888
  66 #define SDP_WRITE_REGISTER_COMPLETE     0x128A8A12
  67 #define SDP_SKIP_DCD_HEADER_COMPLETE    0x900DD009
  68 #define SDP_ERROR_IMXHEADER             0x000a0533
  69
  70 #define SDP_COMMAND_LEN         16
  71
  72 struct sdp_command {
  73         u16 cmd;
  74         u32 addr;
  75         u8 format;
  76         u32 cnt;
  77         u32 data;
  78         u8 rsvd;
  79 } __packed;
  80
  81 enum sdp_state {
  82         SDP_STATE_IDLE,
  83         SDP_STATE_RX_DCD_DATA,
  84         SDP_STATE_RX_FILE_DATA,
  85         SDP_STATE_TX_SEC_CONF,
  86         SDP_STATE_TX_SEC_CONF_BUSY,
  87         SDP_STATE_TX_REGISTER,
  88         SDP_STATE_TX_REGISTER_BUSY,
  89         SDP_STATE_TX_STATUS,
  90         SDP_STATE_TX_STATUS_BUSY,
  91         SDP_STATE_JUMP,
  92 };
  93
  94 struct f_sdp {
  95         struct usb_function             usb_function;
  96
  97         struct usb_descriptor_header    **function;
  98
  99         u8                              altsetting;
 100         enum sdp_state                  state;
 101         enum sdp_state                  next_state;
 102         u32                             dnl_address;
 103         u32                             dnl_bytes_remaining;
 104         u32                             jmp_address;
 105         bool                            always_send_status;
 106         u32                             error_status;
 107
 108         /* EP0 request */
 109         struct usb_request              *req;
 110
 111         /* EP1 IN */
 112         struct usb_ep                   *in_ep;
 113         struct usb_request              *in_req;
 114
 115         bool                            configuration_done;
 116 };
 117
 118 static struct f_sdp *sdp_func;
 119
 120 static inline struct f_sdp *func_to_sdp(struct usb_function *f)
 121 {
 122         return container_of(f, struct f_sdp, usb_function);
 123 }
 124
 125 static struct usb_interface_descriptor sdp_intf_runtime = {
 126         .bLength =              sizeof(sdp_intf_runtime),
 127         .bDescriptorType =      USB_DT_INTERFACE,
 128         .bAlternateSetting =    0,
 129         .bNumEndpoints =        1,
 130         .bInterfaceClass =      USB_CLASS_HID,
 131         .bInterfaceSubClass =   0,
 132         .bInterfaceProtocol =   0,
 133         /* .iInterface = DYNAMIC */
 134 };
 135
 136 /* HID configuration */
 137 static struct usb_class_hid_descriptor sdp_hid_desc = {
 138         .bLength =              sizeof(sdp_hid_desc),
 139         .bDescriptorType =      USB_DT_CS_DEVICE,
 140
 141         .bcdCDC =               __constant_cpu_to_le16(0x0110),
 142         .bCountryCode =         0,
 143         .bNumDescriptors =      1,
 144
 145         .bDescriptorType0       = USB_DT_HID_REPORT,
 146         .wDescriptorLength0     = HID_USAGE_PAGE_LEN,
 147 };
 148
 149 static struct usb_endpoint_descriptor in_desc = {
 150         .bLength =              USB_DT_ENDPOINT_SIZE,
 151         .bDescriptorType =      USB_DT_ENDPOINT, /*USB_DT_CS_ENDPOINT*/
 152
 153         .bEndpointAddress =     1 | USB_DIR_IN,
 154         .bmAttributes = USB_ENDPOINT_XFER_INT,
 155         .wMaxPacketSize =       64,
 156         .bInterval =            1,
 157 };
 158
 159 static struct usb_descriptor_header *sdp_runtime_descs[] = {
 160         (struct usb_descriptor_header *)&sdp_intf_runtime,
 161         (struct usb_descriptor_header *)&sdp_hid_desc,
 162         (struct usb_descriptor_header *)&in_desc,
 163         NULL,
 164 };
 165
 166 /* This is synchronized with what the SoC implementation reports */
 167 static struct hid_report sdp_hid_report = {
 168         .usage_page = {
 169                 0x06, 0x00, 0xff, /* Usage Page */
 170                 0x09, 0x01, /* Usage (Pointer?) */
 171                 0xa1, 0x01, /* Collection */
 172
 173                 0x85, 0x01, /* Report ID */
 174                 0x19, 0x01, /* Usage Minimum */
 175                 0x29, 0x01, /* Usage Maximum */
 176                 0x15, 0x00, /* Local Minimum */
 177                 0x26, 0xFF, 0x00, /* Local Maximum? */
 178                 0x75, 0x08, /* Report Size */
 179                 0x95, 0x10, /* Report Count */
 180                 0x91, 0x02, /* Output Data */
 181
 182                 0x85, 0x02, /* Report ID */
 183                 0x19, 0x01, /* Usage Minimum */
 184                 0x29, 0x01, /* Usage Maximum */
 185                 0x15, 0x00, /* Local Minimum */
 186                 0x26, 0xFF, 0x00, /* Local Maximum? */
 187                 0x75, 0x80, /* Report Size 128 */
 188                 0x95, 0x40, /* Report Count */
 189                 0x91, 0x02, /* Output Data */
 190
 191                 0x85, 0x03, /* Report ID */
 192                 0x19, 0x01, /* Usage Minimum */
 193                 0x29, 0x01, /* Usage Maximum */
 194                 0x15, 0x00, /* Local Minimum */
 195                 0x26, 0xFF, 0x00, /* Local Maximum? */
 196                 0x75, 0x08, /* Report Size 8 */
 197                 0x95, 0x04, /* Report Count */
 198                 0x81, 0x02, /* Input Data */
 199
 200                 0x85, 0x04, /* Report ID */
 201                 0x19, 0x01, /* Usage Minimum */
 202                 0x29, 0x01, /* Usage Maximum */
 203                 0x15, 0x00, /* Local Minimum */
 204                 0x26, 0xFF, 0x00, /* Local Maximum? */
 205                 0x75, 0x08, /* Report Size 8 */
 206                 0x95, 0x40, /* Report Count */
 207                 0x81, 0x02, /* Input Data */
 208                 0xc0
 209         },
 210 };
 211
 212 static const char sdp_name[] = "Serial Downloader Protocol";
 213
 214 /*
 215  * static strings, in UTF-8
 216  */
 217 static struct usb_string strings_sdp_generic[] = {
 218         [0].s = sdp_name,
 219         {  }                    /* end of list */
 220 };
 221
 222 static struct usb_gadget_strings stringtab_sdp_generic = {
 223         .language       = 0x0409,       /* en-us */
 224         .strings        = strings_sdp_generic,
 225 };
 226
 227 static struct usb_gadget_strings *sdp_generic_strings[] = {
 228         &stringtab_sdp_generic,
 229         NULL,
 230 };
 231
 232 static void sdp_rx_command_complete(struct usb_ep *ep, struct usb_request *req)
 233 {
 234         struct f_sdp *sdp = req->context;
 235         int status = req->status;
 236         u8 *data = req->buf;
 237         u8 report = data[0];
 238
 239         if (status != 0) {
 240                 error("Status: %d", status);
 241                 return;
 242         }
 243
 244         if (report != 1) {
 245                 error("Unexpected report %d", report);
 246                 return;
 247         }
 248
 249         struct sdp_command *cmd = req->buf + 1;
 250
 251         debug("%s: command: %04x, addr: %08x, cnt: %u\n",
 252               __func__, be16_to_cpu(cmd->cmd),
 253               be32_to_cpu(cmd->addr), be32_to_cpu(cmd->cnt));
 254
 255         switch (be16_to_cpu(cmd->cmd)) {
 256         case SDP_READ_REGISTER:
 257                 sdp->always_send_status = false;
 258                 sdp->error_status = 0x0;
 259
 260                 sdp->state = SDP_STATE_TX_SEC_CONF;
 261                 sdp->dnl_address = be32_to_cpu(cmd->addr);
 262                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 263                 sdp->next_state = SDP_STATE_TX_REGISTER;
 264                 printf("Reading %d registers at 0x%08x... ",
 265                        sdp->dnl_bytes_remaining, sdp->dnl_address);
 266                 break;
 267         case SDP_WRITE_FILE:
 268                 sdp->always_send_status = true;
 269                 sdp->error_status = SDP_WRITE_FILE_COMPLETE;
 270
 271                 sdp->state = SDP_STATE_RX_FILE_DATA;
 272                 sdp->dnl_address = be32_to_cpu(cmd->addr);
 273                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 274                 sdp->next_state = SDP_STATE_IDLE;
 275
 276                 printf("Downloading file of size %d to 0x%08x... ",
 277                        sdp->dnl_bytes_remaining, sdp->dnl_address);
 278
 279                 break;
 280         case SDP_ERROR_STATUS:
 281                 sdp->always_send_status = true;
 282                 sdp->error_status = 0;
 283
 284                 sdp->state = SDP_STATE_TX_SEC_CONF;
 285                 sdp->next_state = SDP_STATE_IDLE;
 286                 break;
 287         case SDP_DCD_WRITE:
 288                 sdp->always_send_status = true;
 289                 sdp->error_status = SDP_WRITE_REGISTER_COMPLETE;
 290
 291                 sdp->state = SDP_STATE_RX_DCD_DATA;
 292                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 293                 sdp->next_state = SDP_STATE_IDLE;
 294                 break;
 295         case SDP_JUMP_ADDRESS:
 296                 sdp->always_send_status = false;
 297                 sdp->error_status = 0;
 298
 299                 sdp->jmp_address = be32_to_cpu(cmd->addr);
 300                 sdp->state = SDP_STATE_TX_SEC_CONF;
 301                 sdp->next_state = SDP_STATE_JUMP;
 302                 break;
 303         case SDP_SKIP_DCD_HEADER:
 304                 sdp->always_send_status = true;
 305                 sdp->error_status = SDP_SKIP_DCD_HEADER_COMPLETE;
 306
 307                 /* Ignore command, DCD not supported anyway */
 308                 sdp->state = SDP_STATE_TX_SEC_CONF;
 309                 sdp->next_state = SDP_STATE_IDLE;
 310                 break;
 311         default:
 312                 error("Unknown command: %04x\n", be16_to_cpu(cmd->cmd));
 313         }
 314 }
 315
 316 static void sdp_rx_data_complete(struct usb_ep *ep, struct usb_request *req)
 317 {
 318         struct f_sdp *sdp = req->context;
 319         int status = req->status;
 320         u8 *data = req->buf;
 321         u8 report = data[0];
 322         int datalen = req->length - 1;
 323
 324         if (status != 0) {
 325                 error("Status: %d", status);
 326                 return;
 327         }
 328
 329         if (report != 2) {
 330                 error("Unexpected report %d", report);
 331                 return;
 332         }
 333
 334         if (sdp->dnl_bytes_remaining < datalen) {
 335                 /*
 336                  * Some USB stacks require to send a complete buffer as
 337                  * specified in the HID descriptor. This leads to longer
 338                  * transfers than the file length, no problem for us.
 339                  */
 340                 sdp->dnl_bytes_remaining = 0;
 341         } else {
 342                 sdp->dnl_bytes_remaining -= datalen;
 343         }
 344
 345         if (sdp->state == SDP_STATE_RX_FILE_DATA) {
 346                 memcpy((void *)sdp->dnl_address, req->buf + 1, datalen);
 347                 sdp->dnl_address += datalen;
 348         }
 349
 350         if (sdp->dnl_bytes_remaining)
 351                 return;
 352
 353         printf("done\n");
 354
 355         switch (sdp->state) {
 356         case SDP_STATE_RX_FILE_DATA:
 357                 sdp->state = SDP_STATE_TX_SEC_CONF;
 358                 break;
 359         case SDP_STATE_RX_DCD_DATA:
 360                 sdp->state = SDP_STATE_TX_SEC_CONF;
 361                 break;
 362         default:
 363                 error("Invalid state: %d", sdp->state);
 364         }
 365 }
 366
 367 static void sdp_tx_complete(struct usb_ep *ep, struct usb_request *req)
 368 {
 369         struct f_sdp *sdp = req->context;
 370         int status = req->status;
 371
 372         if (status != 0) {
 373                 error("Status: %d", status);
 374                 return;
 375         }
 376
 377         switch (sdp->state) {
 378         case SDP_STATE_TX_SEC_CONF_BUSY:
 379                 /* Not all commands require status report */
 380                 if (sdp->always_send_status || sdp->error_status)
 381                         sdp->state = SDP_STATE_TX_STATUS;
 382                 else
 383                         sdp->state = sdp->next_state;
 384
 385                 break;
 386         case SDP_STATE_TX_STATUS_BUSY:
 387                 sdp->state = sdp->next_state;
 388                 break;
 389         case SDP_STATE_TX_REGISTER_BUSY:
 390                 if (sdp->dnl_bytes_remaining)
 391                         sdp->state = SDP_STATE_TX_REGISTER;
 392                 else
 393                         sdp->state = SDP_STATE_IDLE;
 394                 break;
 395         default:
 396                 error("Wrong State: %d", sdp->state);
 397                 sdp->state = SDP_STATE_IDLE;
 398                 break;
 399         }
 400         debug("%s complete --> %d, %d/%d\n", ep->name,
 401               status, req->actual, req->length);
 402 }
 403
 404 static int sdp_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 405 {
 406         struct usb_gadget *gadget = f->config->cdev->gadget;
 407         struct usb_request *req = f->config->cdev->req;
 408         struct f_sdp *sdp = f->config->cdev->req->context;
 409         u16 len = le16_to_cpu(ctrl->wLength);
 410         u16 w_value = le16_to_cpu(ctrl->wValue);
 411         int value = 0;
 412         u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
 413
 414         debug("w_value: 0x%04x len: 0x%04x\n", w_value, len);
 415         debug("req_type: 0x%02x ctrl->bRequest: 0x%02x sdp->state: %d\n",
 416               req_type, ctrl->bRequest, sdp->state);
 417
 418         if (req_type == USB_TYPE_STANDARD) {
 419                 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR) {
 420                         /* Send HID report descriptor */
 421                         value = min(len, (u16) sizeof(sdp_hid_report));
 422                         memcpy(req->buf, &sdp_hid_report, value);
 423                         sdp->configuration_done = true;
 424                 }
 425         }
 426
 427         if (req_type == USB_TYPE_CLASS) {
 428                 int report = w_value & HID_REPORT_ID_MASK;
 429
 430                 /* HID (SDP) request */
 431                 switch (ctrl->bRequest) {
 432                 case HID_REQ_SET_REPORT:
 433                         switch (report) {
 434                         case 1:
 435                                 value = SDP_COMMAND_LEN + 1;
 436                                 req->complete = sdp_rx_command_complete;
 437                                 break;
 438                         case 2:
 439                                 value = len;
 440                                 req->complete = sdp_rx_data_complete;
 441                                 break;
 442                         }
 443                 }
 444         }
 445
 446         if (value >= 0) {
 447                 req->length = value;
 448                 req->zero = value < len;
 449                 value = usb_ep_queue(gadget->ep0, req, 0);
 450                 if (value < 0) {
 451                         debug("ep_queue --> %d\n", value);
 452                         req->status = 0;
 453                 }
 454         }
 455
 456         return value;
 457 }
 458
 459 static int sdp_bind(struct usb_configuration *c, struct usb_function *f)
 460 {
 461         struct usb_gadget *gadget = c->cdev->gadget;
 462         struct usb_composite_dev *cdev = c->cdev;
 463         struct f_sdp *sdp = func_to_sdp(f);
 464         int rv = 0, id;
 465
 466         id = usb_interface_id(c, f);
 467         if (id < 0)
 468                 return id;
 469         sdp_intf_runtime.bInterfaceNumber = id;
 470
 471         struct usb_ep *ep;
 472
 473         /* allocate instance-specific endpoints */
 474         ep = usb_ep_autoconfig(gadget, &in_desc);
 475         if (!ep) {
 476                 rv = -ENODEV;
 477                 goto error;
 478         }
 479
 480         sdp->in_ep = ep; /* Store IN EP for enabling @ setup */
 481
 482         cdev->req->context = sdp;
 483
 484 error:
 485         return rv;
 486 }
 487
 488 static void sdp_unbind(struct usb_configuration *c, struct usb_function *f)
 489 {
 490         free(sdp_func);
 491         sdp_func = NULL;
 492 }
 493
 494 static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length)
 495 {
 496         struct usb_request *req;
 497
 498         req = usb_ep_alloc_request(ep, 0);
 499         if (!req)
 500                 return req;
 501
 502         req->length = length;
 503         req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, length);
 504         if (!req->buf) {
 505                 usb_ep_free_request(ep, req);
 506                 req = NULL;
 507         }
 508
 509         return req;
 510 }
 511
 512
 513 static struct usb_request *sdp_start_ep(struct usb_ep *ep)
 514 {
 515         struct usb_request *req;
 516
 517         req = alloc_ep_req(ep, 64);
 518         debug("%s: ep:%p req:%p\n", __func__, ep, req);
 519
 520         if (!req)
 521                 return NULL;
 522
 523         memset(req->buf, 0, req->length);
 524         req->complete = sdp_tx_complete;
 525
 526         return req;
 527 }
 528 static int sdp_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 529 {
 530         struct f_sdp *sdp = func_to_sdp(f);
 531         struct usb_composite_dev *cdev = f->config->cdev;
 532         int result;
 533
 534         debug("%s: intf: %d alt: %d\n", __func__, intf, alt);
 535
 536         result = usb_ep_enable(sdp->in_ep, &in_desc);
 537         if (result)
 538                 return result;
 539         sdp->in_req = sdp_start_ep(sdp->in_ep);
 540         sdp->in_req->context = sdp;
 541
 542         sdp->in_ep->driver_data = cdev; /* claim */
 543
 544         sdp->altsetting = alt;
 545         sdp->state = SDP_STATE_IDLE;
 546
 547         return 0;
 548 }
 549
 550 static int sdp_get_alt(struct usb_function *f, unsigned intf)
 551 {
 552         struct f_sdp *sdp = func_to_sdp(f);
 553
 554         return sdp->altsetting;
 555 }
 556
 557 static void sdp_disable(struct usb_function *f)
 558 {
 559         struct f_sdp *sdp = func_to_sdp(f);
 560
 561         usb_ep_disable(sdp->in_ep);
 562
 563         if (sdp->in_req) {
 564                 free(sdp->in_req);
 565                 sdp->in_req = NULL;
 566         }
 567 }
 568
 569 static int sdp_bind_config(struct usb_configuration *c)
 570 {
 571         int status;
 572
 573         if (!sdp_func) {
 574                 sdp_func = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*sdp_func));
 575                 if (!sdp_func)
 576                         return -ENOMEM;
 577         }
 578
 579         memset(sdp_func, 0, sizeof(*sdp_func));
 580
 581         sdp_func->usb_function.name = "sdp";
 582         sdp_func->usb_function.hs_descriptors = sdp_runtime_descs;
 583         sdp_func->usb_function.descriptors = sdp_runtime_descs;
 584         sdp_func->usb_function.bind = sdp_bind;
 585         sdp_func->usb_function.unbind = sdp_unbind;
 586         sdp_func->usb_function.set_alt = sdp_set_alt;
 587         sdp_func->usb_function.get_alt = sdp_get_alt;
 588         sdp_func->usb_function.disable = sdp_disable;
 589         sdp_func->usb_function.strings = sdp_generic_strings;
 590         sdp_func->usb_function.setup = sdp_setup;
 591
 592         status = usb_add_function(c, &sdp_func->usb_function);
 593
 594         return status;
 595 }
 596
 597 int sdp_init(int controller_index)
 598 {
 599         printf("SDP: initialize...\n");
 600         while (!sdp_func->configuration_done) {
 601                 if (ctrlc()) {
 602                         puts("\rCTRL+C - Operation aborted.\n");
 603                         return 1;
 604                 }
 605                 usb_gadget_handle_interrupts(controller_index);
 606         }
 607
 608         return 0;
 609 }
 610
 611 static u32 sdp_jump_imxheader(void *address)
 612 {
 613         flash_header_v2_t *headerv2 = address;
 614         ulong (*entry)(void);
 615
 616         if (headerv2->header.tag != IVT_HEADER_TAG) {
 617                 printf("Header Tag is not an IMX image\n");
 618                 return SDP_ERROR_IMXHEADER;
 619         }
 620
 621         printf("Jumping to 0x%08x\n", headerv2->entry);
 622         entry = (void *)headerv2->entry;
 623         entry();
 624
 625         /* The image probably never returns hence we won't reach that point */
 626         return 0;
 627 }
 628
 629 static void sdp_handle_in_ep(void)
 630 {
 631         u8 *data = sdp_func->in_req->buf;
 632         u32 status;
 633         int datalen;
 634
 635         switch (sdp_func->state) {
 636         case SDP_STATE_TX_SEC_CONF:
 637                 debug("Report 3: HAB security\n");
 638                 data[0] = 3;
 639
 640                 status = SDP_SECURITY_OPEN;
 641                 memcpy(&data[1], &status, 4);
 642                 sdp_func->in_req->length = 5;
 643                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 644                 sdp_func->state = SDP_STATE_TX_SEC_CONF_BUSY;
 645                 break;
 646
 647         case SDP_STATE_TX_STATUS:
 648                 debug("Report 4: Status\n");
 649                 data[0] = 4;
 650
 651                 memcpy(&data[1], &sdp_func->error_status, 4);
 652                 sdp_func->in_req->length = 65;
 653                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 654                 sdp_func->state = SDP_STATE_TX_STATUS_BUSY;
 655                 break;
 656         case SDP_STATE_TX_REGISTER:
 657                 debug("Report 4: Register Values\n");
 658                 data[0] = 4;
 659
 660                 datalen = sdp_func->dnl_bytes_remaining;
 661
 662                 if (datalen > 64)
 663                         datalen = 64;
 664
 665                 memcpy(&data[1], (void *)sdp_func->dnl_address, datalen);
 666                 sdp_func->in_req->length = 65;
 667
 668                 sdp_func->dnl_bytes_remaining -= datalen;
 669                 sdp_func->dnl_address += datalen;
 670
 671                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 672                 sdp_func->state = SDP_STATE_TX_REGISTER_BUSY;
 673                 break;
 674         case SDP_STATE_JUMP:
 675                 printf("Jumping to header at 0x%08x\n", sdp_func->jmp_address);
 676                 status = sdp_jump_imxheader((void *)sdp_func->jmp_address);
 677
 678                 /* If imx header fails, try some U-Boot specific headers */
 679                 if (status) {
 680 #ifdef CONFIG_SPL_BUILD
 681                         /* In SPL, allow jumps to U-Boot images */
 682                         struct spl_image_info spl_image = {};
 683                         spl_parse_image_header(&spl_image,
 684                                 (struct image_header *)sdp_func->jmp_address);
 685                         jump_to_image_no_args(&spl_image);
 686 #else
 687                         /* In U-Boot, allow jumps to scripts */
 688                         source(sdp_func->jmp_address, "script@1");
 689 #endif
 690                 }
 691
 692                 sdp_func->next_state = SDP_STATE_IDLE;
 693                 sdp_func->error_status = status;
 694
 695                 /* Only send Report 4 if there was an error */
 696                 if (status)
 697                         sdp_func->state = SDP_STATE_TX_STATUS;
 698                 else
 699                         sdp_func->state = SDP_STATE_IDLE;
 700                 break;
 701         default:
 702                 break;
 703         };
 704 }
 705
 706 void sdp_handle(int controller_index)
 707 {
 708         printf("SDP: handle requests...\n");
 709         while (1) {
 710                 if (ctrlc()) {
 711                         puts("\rCTRL+C - Operation aborted.\n");
 712                         return;
 713                 }
 714
 715                 usb_gadget_handle_interrupts(controller_index);
 716
 717                 sdp_handle_in_ep();
 718         }
 719 }
 720
 721 int sdp_add(struct usb_configuration *c)
 722 {
 723         int id;
 724
 725         id = usb_string_id(c->cdev);
 726         if (id < 0)
 727                 return id;
 728         strings_sdp_generic[0].id = id;
 729         sdp_intf_runtime.iInterface = id;
 730
 731         debug("%s: cdev: %p gadget: %p gadget->ep0: %p\n", __func__,
 732               c->cdev, c->cdev->gadget, c->cdev->gadget->ep0);
 733
 734         return sdp_bind_config(c);
 735 }
 736
 737 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_sdp, sdp_add);