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 #include <watchdog.h>
  36
  37 #define HID_REPORT_ID_MASK      0x000000ff
  38
  39 /*
  40  * HID class requests
  41  */
  42 #define HID_REQ_GET_REPORT              0x01
  43 #define HID_REQ_GET_IDLE                0x02
  44 #define HID_REQ_GET_PROTOCOL            0x03
  45 #define HID_REQ_SET_REPORT              0x09
  46 #define HID_REQ_SET_IDLE                0x0A
  47 #define HID_REQ_SET_PROTOCOL            0x0B
  48
  49 #define HID_USAGE_PAGE_LEN              76
  50
  51 struct hid_report {
  52         u8 usage_page[HID_USAGE_PAGE_LEN];
  53 } __packed;
  54
  55 #define SDP_READ_REGISTER       0x0101
  56 #define SDP_WRITE_REGISTER      0x0202
  57 #define SDP_WRITE_FILE          0x0404
  58 #define SDP_ERROR_STATUS        0x0505
  59 #define SDP_DCD_WRITE           0x0a0a
  60 #define SDP_JUMP_ADDRESS        0x0b0b
  61 #define SDP_SKIP_DCD_HEADER     0x0c0c
  62
  63 #define SDP_SECURITY_CLOSED             0x12343412
  64 #define SDP_SECURITY_OPEN               0x56787856
  65
  66 #define SDP_WRITE_FILE_COMPLETE         0x88888888
  67 #define SDP_WRITE_REGISTER_COMPLETE     0x128A8A12
  68 #define SDP_SKIP_DCD_HEADER_COMPLETE    0x900DD009
  69 #define SDP_ERROR_IMXHEADER             0x000a0533
  70
  71 #define SDP_COMMAND_LEN         16
  72
  73 struct sdp_command {
  74         u16 cmd;
  75         u32 addr;
  76         u8 format;
  77         u32 cnt;
  78         u32 data;
  79         u8 rsvd;
  80 } __packed;
  81
  82 enum sdp_state {
  83         SDP_STATE_IDLE,
  84         SDP_STATE_RX_DCD_DATA,
  85         SDP_STATE_RX_FILE_DATA,
  86         SDP_STATE_TX_SEC_CONF,
  87         SDP_STATE_TX_SEC_CONF_BUSY,
  88         SDP_STATE_TX_REGISTER,
  89         SDP_STATE_TX_REGISTER_BUSY,
  90         SDP_STATE_TX_STATUS,
  91         SDP_STATE_TX_STATUS_BUSY,
  92         SDP_STATE_JUMP,
  93 };
  94
  95 struct f_sdp {
  96         struct usb_function             usb_function;
  97
  98         struct usb_descriptor_header    **function;
  99
 100         u8                              altsetting;
 101         enum sdp_state                  state;
 102         enum sdp_state                  next_state;
 103         u32                             dnl_address;
 104         u32                             dnl_bytes_remaining;
 105         u32                             jmp_address;
 106         bool                            always_send_status;
 107         u32                             error_status;
 108
 109         /* EP0 request */
 110         struct usb_request              *req;
 111
 112         /* EP1 IN */
 113         struct usb_ep                   *in_ep;
 114         struct usb_request              *in_req;
 115
 116         bool                            configuration_done;
 117 };
 118
 119 static struct f_sdp *sdp_func;
 120
 121 static inline struct f_sdp *func_to_sdp(struct usb_function *f)
 122 {
 123         return container_of(f, struct f_sdp, usb_function);
 124 }
 125
 126 static struct usb_interface_descriptor sdp_intf_runtime = {
 127         .bLength =              sizeof(sdp_intf_runtime),
 128         .bDescriptorType =      USB_DT_INTERFACE,
 129         .bAlternateSetting =    0,
 130         .bNumEndpoints =        1,
 131         .bInterfaceClass =      USB_CLASS_HID,
 132         .bInterfaceSubClass =   0,
 133         .bInterfaceProtocol =   0,
 134         /* .iInterface = DYNAMIC */
 135 };
 136
 137 /* HID configuration */
 138 static struct usb_class_hid_descriptor sdp_hid_desc = {
 139         .bLength =              sizeof(sdp_hid_desc),
 140         .bDescriptorType =      USB_DT_CS_DEVICE,
 141
 142         .bcdCDC =               __constant_cpu_to_le16(0x0110),
 143         .bCountryCode =         0,
 144         .bNumDescriptors =      1,
 145
 146         .bDescriptorType0       = USB_DT_HID_REPORT,
 147         .wDescriptorLength0     = HID_USAGE_PAGE_LEN,
 148 };
 149
 150 static struct usb_endpoint_descriptor in_desc = {
 151         .bLength =              USB_DT_ENDPOINT_SIZE,
 152         .bDescriptorType =      USB_DT_ENDPOINT, /*USB_DT_CS_ENDPOINT*/
 153
 154         .bEndpointAddress =     1 | USB_DIR_IN,
 155         .bmAttributes = USB_ENDPOINT_XFER_INT,
 156         .wMaxPacketSize =       64,
 157         .bInterval =            1,
 158 };
 159
 160 static struct usb_descriptor_header *sdp_runtime_descs[] = {
 161         (struct usb_descriptor_header *)&sdp_intf_runtime,
 162         (struct usb_descriptor_header *)&sdp_hid_desc,
 163         (struct usb_descriptor_header *)&in_desc,
 164         NULL,
 165 };
 166
 167 /* This is synchronized with what the SoC implementation reports */
 168 static struct hid_report sdp_hid_report = {
 169         .usage_page = {
 170                 0x06, 0x00, 0xff, /* Usage Page */
 171                 0x09, 0x01, /* Usage (Pointer?) */
 172                 0xa1, 0x01, /* Collection */
 173
 174                 0x85, 0x01, /* Report ID */
 175                 0x19, 0x01, /* Usage Minimum */
 176                 0x29, 0x01, /* Usage Maximum */
 177                 0x15, 0x00, /* Local Minimum */
 178                 0x26, 0xFF, 0x00, /* Local Maximum? */
 179                 0x75, 0x08, /* Report Size */
 180                 0x95, 0x10, /* Report Count */
 181                 0x91, 0x02, /* Output Data */
 182
 183                 0x85, 0x02, /* Report ID */
 184                 0x19, 0x01, /* Usage Minimum */
 185                 0x29, 0x01, /* Usage Maximum */
 186                 0x15, 0x00, /* Local Minimum */
 187                 0x26, 0xFF, 0x00, /* Local Maximum? */
 188                 0x75, 0x80, /* Report Size 128 */
 189                 0x95, 0x40, /* Report Count */
 190                 0x91, 0x02, /* Output Data */
 191
 192                 0x85, 0x03, /* Report ID */
 193                 0x19, 0x01, /* Usage Minimum */
 194                 0x29, 0x01, /* Usage Maximum */
 195                 0x15, 0x00, /* Local Minimum */
 196                 0x26, 0xFF, 0x00, /* Local Maximum? */
 197                 0x75, 0x08, /* Report Size 8 */
 198                 0x95, 0x04, /* Report Count */
 199                 0x81, 0x02, /* Input Data */
 200
 201                 0x85, 0x04, /* Report ID */
 202                 0x19, 0x01, /* Usage Minimum */
 203                 0x29, 0x01, /* Usage Maximum */
 204                 0x15, 0x00, /* Local Minimum */
 205                 0x26, 0xFF, 0x00, /* Local Maximum? */
 206                 0x75, 0x08, /* Report Size 8 */
 207                 0x95, 0x40, /* Report Count */
 208                 0x81, 0x02, /* Input Data */
 209                 0xc0
 210         },
 211 };
 212
 213 static const char sdp_name[] = "Serial Downloader Protocol";
 214
 215 /*
 216  * static strings, in UTF-8
 217  */
 218 static struct usb_string strings_sdp_generic[] = {
 219         [0].s = sdp_name,
 220         {  }                    /* end of list */
 221 };
 222
 223 static struct usb_gadget_strings stringtab_sdp_generic = {
 224         .language       = 0x0409,       /* en-us */
 225         .strings        = strings_sdp_generic,
 226 };
 227
 228 static struct usb_gadget_strings *sdp_generic_strings[] = {
 229         &stringtab_sdp_generic,
 230         NULL,
 231 };
 232
 233 static void sdp_rx_command_complete(struct usb_ep *ep, struct usb_request *req)
 234 {
 235         struct f_sdp *sdp = req->context;
 236         int status = req->status;
 237         u8 *data = req->buf;
 238         u8 report = data[0];
 239
 240         if (status != 0) {
 241                 pr_err("Status: %d\n", status);
 242                 return;
 243         }
 244
 245         if (report != 1) {
 246                 pr_err("Unexpected report %d\n", report);
 247                 return;
 248         }
 249
 250         struct sdp_command *cmd = req->buf + 1;
 251
 252         debug("%s: command: %04x, addr: %08x, cnt: %u\n",
 253               __func__, be16_to_cpu(cmd->cmd),
 254               be32_to_cpu(cmd->addr), be32_to_cpu(cmd->cnt));
 255
 256         switch (be16_to_cpu(cmd->cmd)) {
 257         case SDP_READ_REGISTER:
 258                 sdp->always_send_status = false;
 259                 sdp->error_status = 0x0;
 260
 261                 sdp->state = SDP_STATE_TX_SEC_CONF;
 262                 sdp->dnl_address = be32_to_cpu(cmd->addr);
 263                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 264                 sdp->next_state = SDP_STATE_TX_REGISTER;
 265                 printf("Reading %d registers at 0x%08x... ",
 266                        sdp->dnl_bytes_remaining, sdp->dnl_address);
 267                 break;
 268         case SDP_WRITE_FILE:
 269                 sdp->always_send_status = true;
 270                 sdp->error_status = SDP_WRITE_FILE_COMPLETE;
 271
 272                 sdp->state = SDP_STATE_RX_FILE_DATA;
 273                 sdp->dnl_address = be32_to_cpu(cmd->addr);
 274                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 275                 sdp->next_state = SDP_STATE_IDLE;
 276
 277                 printf("Downloading file of size %d to 0x%08x... ",
 278                        sdp->dnl_bytes_remaining, sdp->dnl_address);
 279
 280                 break;
 281         case SDP_ERROR_STATUS:
 282                 sdp->always_send_status = true;
 283                 sdp->error_status = 0;
 284
 285                 sdp->state = SDP_STATE_TX_SEC_CONF;
 286                 sdp->next_state = SDP_STATE_IDLE;
 287                 break;
 288         case SDP_DCD_WRITE:
 289                 sdp->always_send_status = true;
 290                 sdp->error_status = SDP_WRITE_REGISTER_COMPLETE;
 291
 292                 sdp->state = SDP_STATE_RX_DCD_DATA;
 293                 sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
 294                 sdp->next_state = SDP_STATE_IDLE;
 295                 break;
 296         case SDP_JUMP_ADDRESS:
 297                 sdp->always_send_status = false;
 298                 sdp->error_status = 0;
 299
 300                 sdp->jmp_address = be32_to_cpu(cmd->addr);
 301                 sdp->state = SDP_STATE_TX_SEC_CONF;
 302                 sdp->next_state = SDP_STATE_JUMP;
 303                 break;
 304         case SDP_SKIP_DCD_HEADER:
 305                 sdp->always_send_status = true;
 306                 sdp->error_status = SDP_SKIP_DCD_HEADER_COMPLETE;
 307
 308                 /* Ignore command, DCD not supported anyway */
 309                 sdp->state = SDP_STATE_TX_SEC_CONF;
 310                 sdp->next_state = SDP_STATE_IDLE;
 311                 break;
 312         default:
 313                 pr_err("Unknown command: %04x\n", be16_to_cpu(cmd->cmd));
 314         }
 315 }
 316
 317 static void sdp_rx_data_complete(struct usb_ep *ep, struct usb_request *req)
 318 {
 319         struct f_sdp *sdp = req->context;
 320         int status = req->status;
 321         u8 *data = req->buf;
 322         u8 report = data[0];
 323         int datalen = req->length - 1;
 324
 325         if (status != 0) {
 326                 pr_err("Status: %d\n", status);
 327                 return;
 328         }
 329
 330         if (report != 2) {
 331                 pr_err("Unexpected report %d\n", report);
 332                 return;
 333         }
 334
 335         if (sdp->dnl_bytes_remaining < datalen) {
 336                 /*
 337                  * Some USB stacks require to send a complete buffer as
 338                  * specified in the HID descriptor. This leads to longer
 339                  * transfers than the file length, no problem for us.
 340                  */
 341                 sdp->dnl_bytes_remaining = 0;
 342         } else {
 343                 sdp->dnl_bytes_remaining -= datalen;
 344         }
 345
 346         if (sdp->state == SDP_STATE_RX_FILE_DATA) {
 347                 memcpy((void *)sdp->dnl_address, req->buf + 1, datalen);
 348                 sdp->dnl_address += datalen;
 349         }
 350
 351         if (sdp->dnl_bytes_remaining)
 352                 return;
 353
 354         printf("done\n");
 355
 356         switch (sdp->state) {
 357         case SDP_STATE_RX_FILE_DATA:
 358                 sdp->state = SDP_STATE_TX_SEC_CONF;
 359                 break;
 360         case SDP_STATE_RX_DCD_DATA:
 361                 sdp->state = SDP_STATE_TX_SEC_CONF;
 362                 break;
 363         default:
 364                 pr_err("Invalid state: %d\n", sdp->state);
 365         }
 366 }
 367
 368 static void sdp_tx_complete(struct usb_ep *ep, struct usb_request *req)
 369 {
 370         struct f_sdp *sdp = req->context;
 371         int status = req->status;
 372
 373         if (status != 0) {
 374                 pr_err("Status: %d\n", status);
 375                 return;
 376         }
 377
 378         switch (sdp->state) {
 379         case SDP_STATE_TX_SEC_CONF_BUSY:
 380                 /* Not all commands require status report */
 381                 if (sdp->always_send_status || sdp->error_status)
 382                         sdp->state = SDP_STATE_TX_STATUS;
 383                 else
 384                         sdp->state = sdp->next_state;
 385
 386                 break;
 387         case SDP_STATE_TX_STATUS_BUSY:
 388                 sdp->state = sdp->next_state;
 389                 break;
 390         case SDP_STATE_TX_REGISTER_BUSY:
 391                 if (sdp->dnl_bytes_remaining)
 392                         sdp->state = SDP_STATE_TX_REGISTER;
 393                 else
 394                         sdp->state = SDP_STATE_IDLE;
 395                 break;
 396         default:
 397                 pr_err("Wrong State: %d\n", sdp->state);
 398                 sdp->state = SDP_STATE_IDLE;
 399                 break;
 400         }
 401         debug("%s complete --> %d, %d/%d\n", ep->name,
 402               status, req->actual, req->length);
 403 }
 404
 405 static int sdp_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
 406 {
 407         struct usb_gadget *gadget = f->config->cdev->gadget;
 408         struct usb_request *req = f->config->cdev->req;
 409         struct f_sdp *sdp = f->config->cdev->req->context;
 410         u16 len = le16_to_cpu(ctrl->wLength);
 411         u16 w_value = le16_to_cpu(ctrl->wValue);
 412         int value = 0;
 413         u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
 414
 415         debug("w_value: 0x%04x len: 0x%04x\n", w_value, len);
 416         debug("req_type: 0x%02x ctrl->bRequest: 0x%02x sdp->state: %d\n",
 417               req_type, ctrl->bRequest, sdp->state);
 418
 419         if (req_type == USB_TYPE_STANDARD) {
 420                 if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR) {
 421                         /* Send HID report descriptor */
 422                         value = min(len, (u16) sizeof(sdp_hid_report));
 423                         memcpy(req->buf, &sdp_hid_report, value);
 424                         sdp->configuration_done = true;
 425                 }
 426         }
 427
 428         if (req_type == USB_TYPE_CLASS) {
 429                 int report = w_value & HID_REPORT_ID_MASK;
 430
 431                 /* HID (SDP) request */
 432                 switch (ctrl->bRequest) {
 433                 case HID_REQ_SET_REPORT:
 434                         switch (report) {
 435                         case 1:
 436                                 value = SDP_COMMAND_LEN + 1;
 437                                 req->complete = sdp_rx_command_complete;
 438                                 break;
 439                         case 2:
 440                                 value = len;
 441                                 req->complete = sdp_rx_data_complete;
 442                                 break;
 443                         }
 444                 }
 445         }
 446
 447         if (value >= 0) {
 448                 req->length = value;
 449                 req->zero = value < len;
 450                 value = usb_ep_queue(gadget->ep0, req, 0);
 451                 if (value < 0) {
 452                         debug("ep_queue --> %d\n", value);
 453                         req->status = 0;
 454                 }
 455         }
 456
 457         return value;
 458 }
 459
 460 static int sdp_bind(struct usb_configuration *c, struct usb_function *f)
 461 {
 462         struct usb_gadget *gadget = c->cdev->gadget;
 463         struct usb_composite_dev *cdev = c->cdev;
 464         struct f_sdp *sdp = func_to_sdp(f);
 465         int rv = 0, id;
 466
 467         id = usb_interface_id(c, f);
 468         if (id < 0)
 469                 return id;
 470         sdp_intf_runtime.bInterfaceNumber = id;
 471
 472         struct usb_ep *ep;
 473
 474         /* allocate instance-specific endpoints */
 475         ep = usb_ep_autoconfig(gadget, &in_desc);
 476         if (!ep) {
 477                 rv = -ENODEV;
 478                 goto error;
 479         }
 480
 481         sdp->in_ep = ep; /* Store IN EP for enabling @ setup */
 482
 483         cdev->req->context = sdp;
 484
 485 error:
 486         return rv;
 487 }
 488
 489 static void sdp_unbind(struct usb_configuration *c, struct usb_function *f)
 490 {
 491         free(sdp_func);
 492         sdp_func = NULL;
 493 }
 494
 495 static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length)
 496 {
 497         struct usb_request *req;
 498
 499         req = usb_ep_alloc_request(ep, 0);
 500         if (!req)
 501                 return req;
 502
 503         req->length = length;
 504         req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, length);
 505         if (!req->buf) {
 506                 usb_ep_free_request(ep, req);
 507                 req = NULL;
 508         }
 509
 510         return req;
 511 }
 512
 513
 514 static struct usb_request *sdp_start_ep(struct usb_ep *ep)
 515 {
 516         struct usb_request *req;
 517
 518         req = alloc_ep_req(ep, 64);
 519         debug("%s: ep:%p req:%p\n", __func__, ep, req);
 520
 521         if (!req)
 522                 return NULL;
 523
 524         memset(req->buf, 0, req->length);
 525         req->complete = sdp_tx_complete;
 526
 527         return req;
 528 }
 529 static int sdp_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
 530 {
 531         struct f_sdp *sdp = func_to_sdp(f);
 532         struct usb_composite_dev *cdev = f->config->cdev;
 533         int result;
 534
 535         debug("%s: intf: %d alt: %d\n", __func__, intf, alt);
 536
 537         result = usb_ep_enable(sdp->in_ep, &in_desc);
 538         if (result)
 539                 return result;
 540         sdp->in_req = sdp_start_ep(sdp->in_ep);
 541         sdp->in_req->context = sdp;
 542
 543         sdp->in_ep->driver_data = cdev; /* claim */
 544
 545         sdp->altsetting = alt;
 546         sdp->state = SDP_STATE_IDLE;
 547
 548         return 0;
 549 }
 550
 551 static int sdp_get_alt(struct usb_function *f, unsigned intf)
 552 {
 553         struct f_sdp *sdp = func_to_sdp(f);
 554
 555         return sdp->altsetting;
 556 }
 557
 558 static void sdp_disable(struct usb_function *f)
 559 {
 560         struct f_sdp *sdp = func_to_sdp(f);
 561
 562         usb_ep_disable(sdp->in_ep);
 563
 564         if (sdp->in_req) {
 565                 free(sdp->in_req);
 566                 sdp->in_req = NULL;
 567         }
 568 }
 569
 570 static int sdp_bind_config(struct usb_configuration *c)
 571 {
 572         int status;
 573
 574         if (!sdp_func) {
 575                 sdp_func = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*sdp_func));
 576                 if (!sdp_func)
 577                         return -ENOMEM;
 578         }
 579
 580         memset(sdp_func, 0, sizeof(*sdp_func));
 581
 582         sdp_func->usb_function.name = "sdp";
 583         sdp_func->usb_function.hs_descriptors = sdp_runtime_descs;
 584         sdp_func->usb_function.descriptors = sdp_runtime_descs;
 585         sdp_func->usb_function.bind = sdp_bind;
 586         sdp_func->usb_function.unbind = sdp_unbind;
 587         sdp_func->usb_function.set_alt = sdp_set_alt;
 588         sdp_func->usb_function.get_alt = sdp_get_alt;
 589         sdp_func->usb_function.disable = sdp_disable;
 590         sdp_func->usb_function.strings = sdp_generic_strings;
 591         sdp_func->usb_function.setup = sdp_setup;
 592
 593         status = usb_add_function(c, &sdp_func->usb_function);
 594
 595         return status;
 596 }
 597
 598 int sdp_init(int controller_index)
 599 {
 600         printf("SDP: initialize...\n");
 601         while (!sdp_func->configuration_done) {
 602                 if (ctrlc()) {
 603                         puts("\rCTRL+C - Operation aborted.\n");
 604                         return 1;
 605                 }
 606
 607                 WATCHDOG_RESET();
 608                 usb_gadget_handle_interrupts(controller_index);
 609         }
 610
 611         return 0;
 612 }
 613
 614 static u32 sdp_jump_imxheader(void *address)
 615 {
 616         flash_header_v2_t *headerv2 = address;
 617         ulong (*entry)(void);
 618
 619         if (headerv2->header.tag != IVT_HEADER_TAG) {
 620                 printf("Header Tag is not an IMX image\n");
 621                 return SDP_ERROR_IMXHEADER;
 622         }
 623
 624         printf("Jumping to 0x%08x\n", headerv2->entry);
 625         entry = (void *)headerv2->entry;
 626         entry();
 627
 628         /* The image probably never returns hence we won't reach that point */
 629         return 0;
 630 }
 631
 632 static void sdp_handle_in_ep(void)
 633 {
 634         u8 *data = sdp_func->in_req->buf;
 635         u32 status;
 636         int datalen;
 637
 638         switch (sdp_func->state) {
 639         case SDP_STATE_TX_SEC_CONF:
 640                 debug("Report 3: HAB security\n");
 641                 data[0] = 3;
 642
 643                 status = SDP_SECURITY_OPEN;
 644                 memcpy(&data[1], &status, 4);
 645                 sdp_func->in_req->length = 5;
 646                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 647                 sdp_func->state = SDP_STATE_TX_SEC_CONF_BUSY;
 648                 break;
 649
 650         case SDP_STATE_TX_STATUS:
 651                 debug("Report 4: Status\n");
 652                 data[0] = 4;
 653
 654                 memcpy(&data[1], &sdp_func->error_status, 4);
 655                 sdp_func->in_req->length = 65;
 656                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 657                 sdp_func->state = SDP_STATE_TX_STATUS_BUSY;
 658                 break;
 659         case SDP_STATE_TX_REGISTER:
 660                 debug("Report 4: Register Values\n");
 661                 data[0] = 4;
 662
 663                 datalen = sdp_func->dnl_bytes_remaining;
 664
 665                 if (datalen > 64)
 666                         datalen = 64;
 667
 668                 memcpy(&data[1], (void *)sdp_func->dnl_address, datalen);
 669                 sdp_func->in_req->length = 65;
 670
 671                 sdp_func->dnl_bytes_remaining -= datalen;
 672                 sdp_func->dnl_address += datalen;
 673
 674                 usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
 675                 sdp_func->state = SDP_STATE_TX_REGISTER_BUSY;
 676                 break;
 677         case SDP_STATE_JUMP:
 678                 printf("Jumping to header at 0x%08x\n", sdp_func->jmp_address);
 679                 status = sdp_jump_imxheader((void *)sdp_func->jmp_address);
 680
 681                 /* If imx header fails, try some U-Boot specific headers */
 682                 if (status) {
 683 #ifdef CONFIG_SPL_BUILD
 684                         /* In SPL, allow jumps to U-Boot images */
 685                         struct spl_image_info spl_image = {};
 686                         spl_parse_image_header(&spl_image,
 687                                 (struct image_header *)sdp_func->jmp_address);
 688                         jump_to_image_no_args(&spl_image);
 689 #else
 690                         /* In U-Boot, allow jumps to scripts */
 691                         source(sdp_func->jmp_address, "script@1");
 692 #endif
 693                 }
 694
 695                 sdp_func->next_state = SDP_STATE_IDLE;
 696                 sdp_func->error_status = status;
 697
 698                 /* Only send Report 4 if there was an error */
 699                 if (status)
 700                         sdp_func->state = SDP_STATE_TX_STATUS;
 701                 else
 702                         sdp_func->state = SDP_STATE_IDLE;
 703                 break;
 704         default:
 705                 break;
 706         };
 707 }
 708
 709 void sdp_handle(int controller_index)
 710 {
 711         printf("SDP: handle requests...\n");
 712         while (1) {
 713                 if (ctrlc()) {
 714                         puts("\rCTRL+C - Operation aborted.\n");
 715                         return;
 716                 }
 717
 718                 WATCHDOG_RESET();
 719                 usb_gadget_handle_interrupts(controller_index);
 720
 721                 sdp_handle_in_ep();
 722         }
 723 }
 724
 725 int sdp_add(struct usb_configuration *c)
 726 {
 727         int id;
 728
 729         id = usb_string_id(c->cdev);
 730         if (id < 0)
 731                 return id;
 732         strings_sdp_generic[0].id = id;
 733         sdp_intf_runtime.iInterface = id;
 734
 735         debug("%s: cdev: %p gadget: %p gadget->ep0: %p\n", __func__,
 736               c->cdev, c->cdev->gadget, c->cdev->gadget->ep0);
 737
 738         return sdp_bind_config(c);
 739 }
 740
 741 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_sdp, sdp_add);