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

   1 /*
   2  * (C) Copyright 2008 - 2009
   3  * Windriver, <www.windriver.com>
   4  * Tom Rix <Tom.Rix@windriver.com>
   5  *
   6  * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
   7  *
   8  * Copyright 2014 Linaro, Ltd.
   9  * Rob Herring <robh@kernel.org>
  10  *
  11  * SPDX-License-Identifier:     GPL-2.0+
  12  */
  13 #include <config.h>
  14 #include <common.h>
  15 #include <errno.h>
  16 #include <fastboot.h>
  17 #include <malloc.h>
  18 #include <linux/usb/ch9.h>
  19 #include <linux/usb/gadget.h>
  20 #include <linux/usb/composite.h>
  21 #include <linux/compiler.h>
  22 #include <version.h>
  23 #include <g_dnl.h>
  24 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
  25 #include <fb_mmc.h>
  26 #endif
  27 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
  28 #include <fb_nand.h>
  29 #endif
  30
  31 #define FASTBOOT_VERSION                "0.4"
  32
  33 #define FASTBOOT_INTERFACE_CLASS        0xff
  34 #define FASTBOOT_INTERFACE_SUB_CLASS    0x42
  35 #define FASTBOOT_INTERFACE_PROTOCOL     0x03
  36
  37 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  (0x0200)
  38 #define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
  39 #define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)
  40
  41 #define EP_BUFFER_SIZE                  4096
  42 /*
  43  * EP_BUFFER_SIZE must always be an integral multiple of maxpacket size
  44  * (64 or 512 or 1024), else we break on certain controllers like DWC3
  45  * that expect bulk OUT requests to be divisible by maxpacket size.
  46  */
  47
  48 struct f_fastboot {
  49         struct usb_function usb_function;
  50
  51         /* IN/OUT EP's and corresponding requests */
  52         struct usb_ep *in_ep, *out_ep;
  53         struct usb_request *in_req, *out_req;
  54 };
  55
  56 static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
  57 {
  58         return container_of(f, struct f_fastboot, usb_function);
  59 }
  60
  61 static struct f_fastboot *fastboot_func;
  62 static unsigned int download_size;
  63 static unsigned int download_bytes;
  64
  65 static struct usb_endpoint_descriptor fs_ep_in = {
  66         .bLength            = USB_DT_ENDPOINT_SIZE,
  67         .bDescriptorType    = USB_DT_ENDPOINT,
  68         .bEndpointAddress   = USB_DIR_IN,
  69         .bmAttributes       = USB_ENDPOINT_XFER_BULK,
  70         .wMaxPacketSize     = cpu_to_le16(64),
  71 };
  72
  73 static struct usb_endpoint_descriptor fs_ep_out = {
  74         .bLength                = USB_DT_ENDPOINT_SIZE,
  75         .bDescriptorType        = USB_DT_ENDPOINT,
  76         .bEndpointAddress       = USB_DIR_OUT,
  77         .bmAttributes           = USB_ENDPOINT_XFER_BULK,
  78         .wMaxPacketSize         = cpu_to_le16(64),
  79 };
  80
  81 static struct usb_endpoint_descriptor hs_ep_in = {
  82         .bLength                = USB_DT_ENDPOINT_SIZE,
  83         .bDescriptorType        = USB_DT_ENDPOINT,
  84         .bEndpointAddress       = USB_DIR_IN,
  85         .bmAttributes           = USB_ENDPOINT_XFER_BULK,
  86         .wMaxPacketSize         = cpu_to_le16(512),
  87 };
  88
  89 static struct usb_endpoint_descriptor hs_ep_out = {
  90         .bLength                = USB_DT_ENDPOINT_SIZE,
  91         .bDescriptorType        = USB_DT_ENDPOINT,
  92         .bEndpointAddress       = USB_DIR_OUT,
  93         .bmAttributes           = USB_ENDPOINT_XFER_BULK,
  94         .wMaxPacketSize         = cpu_to_le16(512),
  95 };
  96
  97 static struct usb_interface_descriptor interface_desc = {
  98         .bLength                = USB_DT_INTERFACE_SIZE,
  99         .bDescriptorType        = USB_DT_INTERFACE,
 100         .bInterfaceNumber       = 0x00,
 101         .bAlternateSetting      = 0x00,
 102         .bNumEndpoints          = 0x02,
 103         .bInterfaceClass        = FASTBOOT_INTERFACE_CLASS,
 104         .bInterfaceSubClass     = FASTBOOT_INTERFACE_SUB_CLASS,
 105         .bInterfaceProtocol     = FASTBOOT_INTERFACE_PROTOCOL,
 106 };
 107
 108 static struct usb_descriptor_header *fb_fs_function[] = {
 109         (struct usb_descriptor_header *)&interface_desc,
 110         (struct usb_descriptor_header *)&fs_ep_in,
 111         (struct usb_descriptor_header *)&fs_ep_out,
 112 };
 113
 114 static struct usb_descriptor_header *fb_hs_function[] = {
 115         (struct usb_descriptor_header *)&interface_desc,
 116         (struct usb_descriptor_header *)&hs_ep_in,
 117         (struct usb_descriptor_header *)&hs_ep_out,
 118         NULL,
 119 };
 120
 121 static struct usb_endpoint_descriptor *
 122 fb_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs,
 123             struct usb_endpoint_descriptor *hs)
 124 {
 125         if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
 126                 return hs;
 127         return fs;
 128 }
 129
 130 /*
 131  * static strings, in UTF-8
 132  */
 133 static const char fastboot_name[] = "Android Fastboot";
 134
 135 static struct usb_string fastboot_string_defs[] = {
 136         [0].s = fastboot_name,
 137         {  }                    /* end of list */
 138 };
 139
 140 static struct usb_gadget_strings stringtab_fastboot = {
 141         .language       = 0x0409,       /* en-us */
 142         .strings        = fastboot_string_defs,
 143 };
 144
 145 static struct usb_gadget_strings *fastboot_strings[] = {
 146         &stringtab_fastboot,
 147         NULL,
 148 };
 149
 150 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
 151 static int strcmp_l1(const char *s1, const char *s2);
 152
 153
 154 static char *fb_response_str;
 155
 156 void fastboot_fail(const char *reason)
 157 {
 158         strncpy(fb_response_str, "FAIL\0", 5);
 159         strncat(fb_response_str, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
 160 }
 161
 162 void fastboot_okay(const char *reason)
 163 {
 164         strncpy(fb_response_str, "OKAY\0", 5);
 165         strncat(fb_response_str, reason, FASTBOOT_RESPONSE_LEN - 4 - 1);
 166 }
 167
 168 static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
 169 {
 170         int status = req->status;
 171         if (!status)
 172                 return;
 173         printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
 174 }
 175
 176 static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
 177 {
 178         int id;
 179         struct usb_gadget *gadget = c->cdev->gadget;
 180         struct f_fastboot *f_fb = func_to_fastboot(f);
 181         const char *s;
 182
 183         /* DYNAMIC interface numbers assignments */
 184         id = usb_interface_id(c, f);
 185         if (id < 0)
 186                 return id;
 187         interface_desc.bInterfaceNumber = id;
 188
 189         id = usb_string_id(c->cdev);
 190         if (id < 0)
 191                 return id;
 192         fastboot_string_defs[0].id = id;
 193         interface_desc.iInterface = id;
 194
 195         f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
 196         if (!f_fb->in_ep)
 197                 return -ENODEV;
 198         f_fb->in_ep->driver_data = c->cdev;
 199
 200         f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
 201         if (!f_fb->out_ep)
 202                 return -ENODEV;
 203         f_fb->out_ep->driver_data = c->cdev;
 204
 205         f->descriptors = fb_fs_function;
 206
 207         if (gadget_is_dualspeed(gadget)) {
 208                 /* Assume endpoint addresses are the same for both speeds */
 209                 hs_ep_in.bEndpointAddress = fs_ep_in.bEndpointAddress;
 210                 hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;
 211                 /* copy HS descriptors */
 212                 f->hs_descriptors = fb_hs_function;
 213         }
 214
 215         s = getenv("serial#");
 216         if (s)
 217                 g_dnl_set_serialnumber((char *)s);
 218
 219         return 0;
 220 }
 221
 222 static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
 223 {
 224         memset(fastboot_func, 0, sizeof(*fastboot_func));
 225 }
 226
 227 static void fastboot_disable(struct usb_function *f)
 228 {
 229         struct f_fastboot *f_fb = func_to_fastboot(f);
 230
 231         usb_ep_disable(f_fb->out_ep);
 232         usb_ep_disable(f_fb->in_ep);
 233
 234         if (f_fb->out_req) {
 235                 free(f_fb->out_req->buf);
 236                 usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
 237                 f_fb->out_req = NULL;
 238         }
 239         if (f_fb->in_req) {
 240                 free(f_fb->in_req->buf);
 241                 usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
 242                 f_fb->in_req = NULL;
 243         }
 244 }
 245
 246 static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
 247 {
 248         struct usb_request *req;
 249
 250         req = usb_ep_alloc_request(ep, 0);
 251         if (!req)
 252                 return NULL;
 253
 254         req->length = EP_BUFFER_SIZE;
 255         req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
 256         if (!req->buf) {
 257                 usb_ep_free_request(ep, req);
 258                 return NULL;
 259         }
 260
 261         memset(req->buf, 0, req->length);
 262         return req;
 263 }
 264
 265 static int fastboot_set_alt(struct usb_function *f,
 266                             unsigned interface, unsigned alt)
 267 {
 268         int ret;
 269         struct usb_composite_dev *cdev = f->config->cdev;
 270         struct usb_gadget *gadget = cdev->gadget;
 271         struct f_fastboot *f_fb = func_to_fastboot(f);
 272         const struct usb_endpoint_descriptor *d;
 273
 274         debug("%s: func: %s intf: %d alt: %d\n",
 275               __func__, f->name, interface, alt);
 276
 277         d = fb_ep_desc(gadget, &fs_ep_out, &hs_ep_out);
 278         ret = usb_ep_enable(f_fb->out_ep, d);
 279         if (ret) {
 280                 puts("failed to enable out ep\n");
 281                 return ret;
 282         }
 283
 284         f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
 285         if (!f_fb->out_req) {
 286                 puts("failed to alloc out req\n");
 287                 ret = -EINVAL;
 288                 goto err;
 289         }
 290         f_fb->out_req->complete = rx_handler_command;
 291
 292         d = fb_ep_desc(gadget, &fs_ep_in, &hs_ep_in);
 293         ret = usb_ep_enable(f_fb->in_ep, d);
 294         if (ret) {
 295                 puts("failed to enable in ep\n");
 296                 goto err;
 297         }
 298
 299         f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
 300         if (!f_fb->in_req) {
 301                 puts("failed alloc req in\n");
 302                 ret = -EINVAL;
 303                 goto err;
 304         }
 305         f_fb->in_req->complete = fastboot_complete;
 306
 307         ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
 308         if (ret)
 309                 goto err;
 310
 311         return 0;
 312 err:
 313         fastboot_disable(f);
 314         return ret;
 315 }
 316
 317 static int fastboot_add(struct usb_configuration *c)
 318 {
 319         struct f_fastboot *f_fb = fastboot_func;
 320         int status;
 321
 322         debug("%s: cdev: 0x%p\n", __func__, c->cdev);
 323
 324         if (!f_fb) {
 325                 f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
 326                 if (!f_fb)
 327                         return -ENOMEM;
 328
 329                 fastboot_func = f_fb;
 330                 memset(f_fb, 0, sizeof(*f_fb));
 331         }
 332
 333         f_fb->usb_function.name = "f_fastboot";
 334         f_fb->usb_function.bind = fastboot_bind;
 335         f_fb->usb_function.unbind = fastboot_unbind;
 336         f_fb->usb_function.set_alt = fastboot_set_alt;
 337         f_fb->usb_function.disable = fastboot_disable;
 338         f_fb->usb_function.strings = fastboot_strings;
 339
 340         status = usb_add_function(c, &f_fb->usb_function);
 341         if (status) {
 342                 free(f_fb);
 343                 fastboot_func = f_fb;
 344         }
 345
 346         return status;
 347 }
 348 DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);
 349
 350 static int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
 351 {
 352         struct usb_request *in_req = fastboot_func->in_req;
 353         int ret;
 354
 355         memcpy(in_req->buf, buffer, buffer_size);
 356         in_req->length = buffer_size;
 357
 358         usb_ep_dequeue(fastboot_func->in_ep, in_req);
 359
 360         ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
 361         if (ret)
 362                 printf("Error %d on queue\n", ret);
 363         return 0;
 364 }
 365
 366 static int fastboot_tx_write_str(const char *buffer)
 367 {
 368         return fastboot_tx_write(buffer, strlen(buffer));
 369 }
 370
 371 static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
 372 {
 373         do_reset(NULL, 0, 0, NULL);
 374 }
 375
 376 int __weak fb_set_reboot_flag(void)
 377 {
 378         return -ENOSYS;
 379 }
 380
 381 static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
 382 {
 383         char *cmd = req->buf;
 384         if (!strcmp_l1("reboot-bootloader", cmd)) {
 385                 if (fb_set_reboot_flag()) {
 386                         fastboot_tx_write_str("FAILCannot set reboot flag");
 387                         return;
 388                 }
 389         }
 390         fastboot_func->in_req->complete = compl_do_reset;
 391         fastboot_tx_write_str("OKAY");
 392 }
 393
 394 static int strcmp_l1(const char *s1, const char *s2)
 395 {
 396         if (!s1 || !s2)
 397                 return -1;
 398         return strncmp(s1, s2, strlen(s1));
 399 }
 400
 401 static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
 402 {
 403         char *cmd = req->buf;
 404         char response[FASTBOOT_RESPONSE_LEN];
 405         const char *s;
 406         size_t chars_left;
 407
 408         strcpy(response, "OKAY");
 409         chars_left = sizeof(response) - strlen(response) - 1;
 410
 411         strsep(&cmd, ":");
 412         if (!cmd) {
 413                 error("missing variable");
 414                 fastboot_tx_write_str("FAILmissing var");
 415                 return;
 416         }
 417
 418         if (!strcmp_l1("version", cmd)) {
 419                 strncat(response, FASTBOOT_VERSION, chars_left);
 420         } else if (!strcmp_l1("bootloader-version", cmd)) {
 421                 strncat(response, U_BOOT_VERSION, chars_left);
 422         } else if (!strcmp_l1("downloadsize", cmd) ||
 423                 !strcmp_l1("max-download-size", cmd)) {
 424                 char str_num[12];
 425
 426                 sprintf(str_num, "0x%08x", CONFIG_FASTBOOT_BUF_SIZE);
 427                 strncat(response, str_num, chars_left);
 428         } else if (!strcmp_l1("serialno", cmd)) {
 429                 s = getenv("serial#");
 430                 if (s)
 431                         strncat(response, s, chars_left);
 432                 else
 433                         strcpy(response, "FAILValue not set");
 434         } else {
 435                 char envstr[32];
 436
 437                 snprintf(envstr, sizeof(envstr) - 1, "fastboot.%s", cmd);
 438                 s = getenv(envstr);
 439                 if (s) {
 440                         strncat(response, s, chars_left);
 441                 } else {
 442                         printf("WARNING: unknown variable: %s\n", cmd);
 443                         strcpy(response, "FAILVariable not implemented");
 444                 }
 445         }
 446         fastboot_tx_write_str(response);
 447 }
 448
 449 static unsigned int rx_bytes_expected(struct usb_ep *ep)
 450 {
 451         int rx_remain = download_size - download_bytes;
 452         unsigned int rem;
 453         unsigned int maxpacket = ep->maxpacket;
 454
 455         if (rx_remain <= 0)
 456                 return 0;
 457         else if (rx_remain > EP_BUFFER_SIZE)
 458                 return EP_BUFFER_SIZE;
 459
 460         /*
 461          * Some controllers e.g. DWC3 don't like OUT transfers to be
 462          * not ending in maxpacket boundary. So just make them happy by
 463          * always requesting for integral multiple of maxpackets.
 464          * This shouldn't bother controllers that don't care about it.
 465          */
 466         rem = rx_remain % maxpacket;
 467         if (rem > 0)
 468                 rx_remain = rx_remain + (maxpacket - rem);
 469
 470         return rx_remain;
 471 }
 472
 473 #define BYTES_PER_DOT   0x20000
 474 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
 475 {
 476         char response[FASTBOOT_RESPONSE_LEN];
 477         unsigned int transfer_size = download_size - download_bytes;
 478         const unsigned char *buffer = req->buf;
 479         unsigned int buffer_size = req->actual;
 480         unsigned int pre_dot_num, now_dot_num;
 481
 482         if (req->status != 0) {
 483                 printf("Bad status: %d\n", req->status);
 484                 return;
 485         }
 486
 487         if (buffer_size < transfer_size)
 488                 transfer_size = buffer_size;
 489
 490         memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes,
 491                buffer, transfer_size);
 492
 493         pre_dot_num = download_bytes / BYTES_PER_DOT;
 494         download_bytes += transfer_size;
 495         now_dot_num = download_bytes / BYTES_PER_DOT;
 496
 497         if (pre_dot_num != now_dot_num) {
 498                 putc('.');
 499                 if (!(now_dot_num % 74))
 500                         putc('\n');
 501         }
 502
 503         /* Check if transfer is done */
 504         if (download_bytes >= download_size) {
 505                 /*
 506                  * Reset global transfer variable, keep download_bytes because
 507                  * it will be used in the next possible flashing command
 508                  */
 509                 download_size = 0;
 510                 req->complete = rx_handler_command;
 511                 req->length = EP_BUFFER_SIZE;
 512
 513                 strcpy(response, "OKAY");
 514                 fastboot_tx_write_str(response);
 515
 516                 printf("\ndownloading of %d bytes finished\n", download_bytes);
 517         } else {
 518                 req->length = rx_bytes_expected(ep);
 519         }
 520
 521         req->actual = 0;
 522         usb_ep_queue(ep, req, 0);
 523 }
 524
 525 static void cb_download(struct usb_ep *ep, struct usb_request *req)
 526 {
 527         char *cmd = req->buf;
 528         char response[FASTBOOT_RESPONSE_LEN];
 529
 530         strsep(&cmd, ":");
 531         download_size = simple_strtoul(cmd, NULL, 16);
 532         download_bytes = 0;
 533
 534         printf("Starting download of %d bytes\n", download_size);
 535
 536         if (0 == download_size) {
 537                 strcpy(response, "FAILdata invalid size");
 538         } else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) {
 539                 download_size = 0;
 540                 strcpy(response, "FAILdata too large");
 541         } else {
 542                 sprintf(response, "DATA%08x", download_size);
 543                 req->complete = rx_handler_dl_image;
 544                 req->length = rx_bytes_expected(ep);
 545         }
 546         fastboot_tx_write_str(response);
 547 }
 548
 549 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
 550 {
 551         char boot_addr_start[12];
 552         char *bootm_args[] = { "bootm", boot_addr_start, NULL };
 553
 554         puts("Booting kernel..\n");
 555
 556         sprintf(boot_addr_start, "0x%lx", load_addr);
 557         do_bootm(NULL, 0, 2, bootm_args);
 558
 559         /* This only happens if image is somehow faulty so we start over */
 560         do_reset(NULL, 0, 0, NULL);
 561 }
 562
 563 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
 564 {
 565         fastboot_func->in_req->complete = do_bootm_on_complete;
 566         fastboot_tx_write_str("OKAY");
 567 }
 568
 569 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
 570 {
 571         g_dnl_trigger_detach();
 572 }
 573
 574 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
 575 {
 576         fastboot_func->in_req->complete = do_exit_on_complete;
 577         fastboot_tx_write_str("OKAY");
 578 }
 579
 580 #ifdef CONFIG_FASTBOOT_FLASH
 581 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
 582 {
 583         char *cmd = req->buf;
 584         char response[FASTBOOT_RESPONSE_LEN];
 585
 586         strsep(&cmd, ":");
 587         if (!cmd) {
 588                 error("missing partition name");
 589                 fastboot_tx_write_str("FAILmissing partition name");
 590                 return;
 591         }
 592
 593         /* initialize the response buffer */
 594         fb_response_str = response;
 595
 596         fastboot_fail("no flash device defined");
 597 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 598         fb_mmc_flash_write(cmd, (void *)CONFIG_FASTBOOT_BUF_ADDR,
 599                            download_bytes);
 600 #endif
 601 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
 602         fb_nand_flash_write(cmd,
 603                             (void *)CONFIG_FASTBOOT_BUF_ADDR,
 604                             download_bytes);
 605 #endif
 606         fastboot_tx_write_str(response);
 607 }
 608 #endif
 609
 610 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
 611 {
 612         char *cmd = req->buf;
 613 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 614         if (strncmp("format", cmd + 4, 6) == 0) {
 615                 char cmdbuf[32];
 616                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
 617                         CONFIG_FASTBOOT_FLASH_MMC_DEV);
 618                 if (run_command(cmdbuf, 0))
 619                         fastboot_tx_write_str("FAIL");
 620                 else
 621                         fastboot_tx_write_str("OKAY");
 622         } else
 623 #endif
 624         if (strncmp("unlock", cmd + 4, 8) == 0) {
 625                 fastboot_tx_write_str("FAILnot implemented");
 626         }
 627         else {
 628                 fastboot_tx_write_str("FAILunknown oem command");
 629         }
 630 }
 631
 632 #ifdef CONFIG_FASTBOOT_FLASH
 633 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
 634 {
 635         char *cmd = req->buf;
 636         char response[FASTBOOT_RESPONSE_LEN];
 637
 638         strsep(&cmd, ":");
 639         if (!cmd) {
 640                 error("missing partition name");
 641                 fastboot_tx_write_str("FAILmissing partition name");
 642                 return;
 643         }
 644
 645         /* initialize the response buffer */
 646         fb_response_str = response;
 647
 648         fastboot_fail("no flash device defined");
 649 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
 650         fb_mmc_erase(cmd);
 651 #endif
 652 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
 653         fb_nand_erase(cmd);
 654 #endif
 655         fastboot_tx_write_str(response);
 656 }
 657 #endif
 658
 659 struct cmd_dispatch_info {
 660         char *cmd;
 661         void (*cb)(struct usb_ep *ep, struct usb_request *req);
 662 };
 663
 664 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
 665         {
 666                 .cmd = "reboot",
 667                 .cb = cb_reboot,
 668         }, {
 669                 .cmd = "getvar:",
 670                 .cb = cb_getvar,
 671         }, {
 672                 .cmd = "download:",
 673                 .cb = cb_download,
 674         }, {
 675                 .cmd = "boot",
 676                 .cb = cb_boot,
 677         }, {
 678                 .cmd = "continue",
 679                 .cb = cb_continue,
 680         },
 681 #ifdef CONFIG_FASTBOOT_FLASH
 682         {
 683                 .cmd = "flash",
 684                 .cb = cb_flash,
 685         }, {
 686                 .cmd = "erase",
 687                 .cb = cb_erase,
 688         },
 689 #endif
 690         {
 691                 .cmd = "oem",
 692                 .cb = cb_oem,
 693         },
 694 };
 695
 696 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
 697 {
 698         char *cmdbuf = req->buf;
 699         void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
 700         int i;
 701
 702         if (req->status != 0 || req->length == 0)
 703                 return;
 704
 705         for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
 706                 if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
 707                         func_cb = cmd_dispatch_info[i].cb;
 708                         break;
 709                 }
 710         }
 711
 712         if (!func_cb) {
 713                 error("unknown command: %s", cmdbuf);
 714                 fastboot_tx_write_str("FAILunknown command");
 715         } else {
 716                 if (req->actual < req->length) {
 717                         u8 *buf = (u8 *)req->buf;
 718                         buf[req->actual] = 0;
 719                         func_cb(ep, req);
 720                 } else {
 721                         error("buffer overflow");
 722                         fastboot_tx_write_str("FAILbuffer overflow");
 723                 }
 724         }
 725
 726         *cmdbuf = '\0';
 727         req->actual = 0;
 728         usb_ep_queue(ep, req, 0);
 729 }