xref: /openbmc/u-boot/drivers/usb/gadget/f_fastboot.c (revision baefb63a) 
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 = env_get("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 		pr_err("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 = env_get("serial#");
430 		if (s)
431 			strncat(response, s, chars_left);
432 		else
433 			strcpy(response, "FAILValue not set");
434 	} else {
435 		char *envstr;
436 
437 		envstr = malloc(strlen("fastboot.") + strlen(cmd) + 1);
438 		if (!envstr) {
439 			fastboot_tx_write_str("FAILmalloc error");
440 			return;
441 		}
442 
443 		sprintf(envstr, "fastboot.%s", cmd);
444 		s = env_get(envstr);
445 		if (s) {
446 			strncat(response, s, chars_left);
447 		} else {
448 			printf("WARNING: unknown variable: %s\n", cmd);
449 			strcpy(response, "FAILVariable not implemented");
450 		}
451 
452 		free(envstr);
453 	}
454 	fastboot_tx_write_str(response);
455 }
456 
457 static unsigned int rx_bytes_expected(struct usb_ep *ep)
458 {
459 	int rx_remain = download_size - download_bytes;
460 	unsigned int rem;
461 	unsigned int maxpacket = ep->maxpacket;
462 
463 	if (rx_remain <= 0)
464 		return 0;
465 	else if (rx_remain > EP_BUFFER_SIZE)
466 		return EP_BUFFER_SIZE;
467 
468 	/*
469 	 * Some controllers e.g. DWC3 don't like OUT transfers to be
470 	 * not ending in maxpacket boundary. So just make them happy by
471 	 * always requesting for integral multiple of maxpackets.
472 	 * This shouldn't bother controllers that don't care about it.
473 	 */
474 	rem = rx_remain % maxpacket;
475 	if (rem > 0)
476 		rx_remain = rx_remain + (maxpacket - rem);
477 
478 	return rx_remain;
479 }
480 
481 #define BYTES_PER_DOT	0x20000
482 static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
483 {
484 	char response[FASTBOOT_RESPONSE_LEN];
485 	unsigned int transfer_size = download_size - download_bytes;
486 	const unsigned char *buffer = req->buf;
487 	unsigned int buffer_size = req->actual;
488 	unsigned int pre_dot_num, now_dot_num;
489 
490 	if (req->status != 0) {
491 		printf("Bad status: %d\n", req->status);
492 		return;
493 	}
494 
495 	if (buffer_size < transfer_size)
496 		transfer_size = buffer_size;
497 
498 	memcpy((void *)CONFIG_FASTBOOT_BUF_ADDR + download_bytes,
499 	       buffer, transfer_size);
500 
501 	pre_dot_num = download_bytes / BYTES_PER_DOT;
502 	download_bytes += transfer_size;
503 	now_dot_num = download_bytes / BYTES_PER_DOT;
504 
505 	if (pre_dot_num != now_dot_num) {
506 		putc('.');
507 		if (!(now_dot_num % 74))
508 			putc('\n');
509 	}
510 
511 	/* Check if transfer is done */
512 	if (download_bytes >= download_size) {
513 		/*
514 		 * Reset global transfer variable, keep download_bytes because
515 		 * it will be used in the next possible flashing command
516 		 */
517 		download_size = 0;
518 		req->complete = rx_handler_command;
519 		req->length = EP_BUFFER_SIZE;
520 
521 		strcpy(response, "OKAY");
522 		fastboot_tx_write_str(response);
523 
524 		printf("\ndownloading of %d bytes finished\n", download_bytes);
525 	} else {
526 		req->length = rx_bytes_expected(ep);
527 	}
528 
529 	req->actual = 0;
530 	usb_ep_queue(ep, req, 0);
531 }
532 
533 static void cb_download(struct usb_ep *ep, struct usb_request *req)
534 {
535 	char *cmd = req->buf;
536 	char response[FASTBOOT_RESPONSE_LEN];
537 
538 	strsep(&cmd, ":");
539 	download_size = simple_strtoul(cmd, NULL, 16);
540 	download_bytes = 0;
541 
542 	printf("Starting download of %d bytes\n", download_size);
543 
544 	if (0 == download_size) {
545 		strcpy(response, "FAILdata invalid size");
546 	} else if (download_size > CONFIG_FASTBOOT_BUF_SIZE) {
547 		download_size = 0;
548 		strcpy(response, "FAILdata too large");
549 	} else {
550 		sprintf(response, "DATA%08x", download_size);
551 		req->complete = rx_handler_dl_image;
552 		req->length = rx_bytes_expected(ep);
553 	}
554 	fastboot_tx_write_str(response);
555 }
556 
557 static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
558 {
559 	char boot_addr_start[12];
560 	char *bootm_args[] = { "bootm", boot_addr_start, NULL };
561 
562 	puts("Booting kernel..\n");
563 
564 	sprintf(boot_addr_start, "0x%lx", (long)CONFIG_FASTBOOT_BUF_ADDR);
565 	do_bootm(NULL, 0, 2, bootm_args);
566 
567 	/* This only happens if image is somehow faulty so we start over */
568 	do_reset(NULL, 0, 0, NULL);
569 }
570 
571 static void cb_boot(struct usb_ep *ep, struct usb_request *req)
572 {
573 	fastboot_func->in_req->complete = do_bootm_on_complete;
574 	fastboot_tx_write_str("OKAY");
575 }
576 
577 static void do_exit_on_complete(struct usb_ep *ep, struct usb_request *req)
578 {
579 	g_dnl_trigger_detach();
580 }
581 
582 static void cb_continue(struct usb_ep *ep, struct usb_request *req)
583 {
584 	fastboot_func->in_req->complete = do_exit_on_complete;
585 	fastboot_tx_write_str("OKAY");
586 }
587 
588 #ifdef CONFIG_FASTBOOT_FLASH
589 static void cb_flash(struct usb_ep *ep, struct usb_request *req)
590 {
591 	char *cmd = req->buf;
592 	char response[FASTBOOT_RESPONSE_LEN];
593 
594 	strsep(&cmd, ":");
595 	if (!cmd) {
596 		pr_err("missing partition name");
597 		fastboot_tx_write_str("FAILmissing partition name");
598 		return;
599 	}
600 
601 	/* initialize the response buffer */
602 	fb_response_str = response;
603 
604 	fastboot_fail("no flash device defined");
605 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
606 	fb_mmc_flash_write(cmd, (void *)CONFIG_FASTBOOT_BUF_ADDR,
607 			   download_bytes);
608 #endif
609 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
610 	fb_nand_flash_write(cmd,
611 			    (void *)CONFIG_FASTBOOT_BUF_ADDR,
612 			    download_bytes);
613 #endif
614 	fastboot_tx_write_str(response);
615 }
616 #endif
617 
618 static void cb_oem(struct usb_ep *ep, struct usb_request *req)
619 {
620 	char *cmd = req->buf;
621 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
622 	if (strncmp("format", cmd + 4, 6) == 0) {
623 		char cmdbuf[32];
624                 sprintf(cmdbuf, "gpt write mmc %x $partitions",
625 			CONFIG_FASTBOOT_FLASH_MMC_DEV);
626                 if (run_command(cmdbuf, 0))
627 			fastboot_tx_write_str("FAIL");
628                 else
629 			fastboot_tx_write_str("OKAY");
630 	} else
631 #endif
632 	if (strncmp("unlock", cmd + 4, 8) == 0) {
633 		fastboot_tx_write_str("FAILnot implemented");
634 	}
635 	else {
636 		fastboot_tx_write_str("FAILunknown oem command");
637 	}
638 }
639 
640 #ifdef CONFIG_FASTBOOT_FLASH
641 static void cb_erase(struct usb_ep *ep, struct usb_request *req)
642 {
643 	char *cmd = req->buf;
644 	char response[FASTBOOT_RESPONSE_LEN];
645 
646 	strsep(&cmd, ":");
647 	if (!cmd) {
648 		pr_err("missing partition name");
649 		fastboot_tx_write_str("FAILmissing partition name");
650 		return;
651 	}
652 
653 	/* initialize the response buffer */
654 	fb_response_str = response;
655 
656 	fastboot_fail("no flash device defined");
657 #ifdef CONFIG_FASTBOOT_FLASH_MMC_DEV
658 	fb_mmc_erase(cmd);
659 #endif
660 #ifdef CONFIG_FASTBOOT_FLASH_NAND_DEV
661 	fb_nand_erase(cmd);
662 #endif
663 	fastboot_tx_write_str(response);
664 }
665 #endif
666 
667 struct cmd_dispatch_info {
668 	char *cmd;
669 	void (*cb)(struct usb_ep *ep, struct usb_request *req);
670 };
671 
672 static const struct cmd_dispatch_info cmd_dispatch_info[] = {
673 	{
674 		.cmd = "reboot",
675 		.cb = cb_reboot,
676 	}, {
677 		.cmd = "getvar:",
678 		.cb = cb_getvar,
679 	}, {
680 		.cmd = "download:",
681 		.cb = cb_download,
682 	}, {
683 		.cmd = "boot",
684 		.cb = cb_boot,
685 	}, {
686 		.cmd = "continue",
687 		.cb = cb_continue,
688 	},
689 #ifdef CONFIG_FASTBOOT_FLASH
690 	{
691 		.cmd = "flash",
692 		.cb = cb_flash,
693 	}, {
694 		.cmd = "erase",
695 		.cb = cb_erase,
696 	},
697 #endif
698 	{
699 		.cmd = "oem",
700 		.cb = cb_oem,
701 	},
702 };
703 
704 static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
705 {
706 	char *cmdbuf = req->buf;
707 	void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
708 	int i;
709 
710 	if (req->status != 0 || req->length == 0)
711 		return;
712 
713 	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
714 		if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
715 			func_cb = cmd_dispatch_info[i].cb;
716 			break;
717 		}
718 	}
719 
720 	if (!func_cb) {
721 		pr_err("unknown command: %.*s", req->actual, cmdbuf);
722 		fastboot_tx_write_str("FAILunknown command");
723 	} else {
724 		if (req->actual < req->length) {
725 			u8 *buf = (u8 *)req->buf;
726 			buf[req->actual] = 0;
727 			func_cb(ep, req);
728 		} else {
729 			pr_err("buffer overflow");
730 			fastboot_tx_write_str("FAILbuffer overflow");
731 		}
732 	}
733 
734 	*cmdbuf = '\0';
735 	req->actual = 0;
736 	usb_ep_queue(ep, req, 0);
737 }
738