xref: /openbmc/u-boot/common/dfu.c (revision d94604d5)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * dfu.c -- dfu command
4  *
5  * Copyright (C) 2015
6  * Lukasz Majewski <l.majewski@majess.pl>
7  *
8  * Copyright (C) 2012 Samsung Electronics
9  * authors: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
10  *	    Lukasz Majewski <l.majewski@samsung.com>
11  */
12 
13 #include <common.h>
14 #include <watchdog.h>
15 #include <dfu.h>
16 #include <console.h>
17 #include <g_dnl.h>
18 #include <usb.h>
19 #include <net.h>
20 
run_usb_dnl_gadget(int usbctrl_index,char * usb_dnl_gadget)21 int run_usb_dnl_gadget(int usbctrl_index, char *usb_dnl_gadget)
22 {
23 	bool dfu_reset = false;
24 	int ret, i = 0;
25 
26 	ret = usb_gadget_initialize(usbctrl_index);
27 	if (ret) {
28 		pr_err("usb_gadget_initialize failed\n");
29 		return CMD_RET_FAILURE;
30 	}
31 	g_dnl_clear_detach();
32 	ret = g_dnl_register(usb_dnl_gadget);
33 	if (ret) {
34 		pr_err("g_dnl_register failed");
35 		return CMD_RET_FAILURE;
36 	}
37 
38 	while (1) {
39 		if (g_dnl_detach()) {
40 			/*
41 			 * Check if USB bus reset is performed after detach,
42 			 * which indicates that -R switch has been passed to
43 			 * dfu-util. In this case reboot the device
44 			 */
45 			if (dfu_usb_get_reset()) {
46 				dfu_reset = true;
47 				goto exit;
48 			}
49 
50 			/*
51 			 * This extra number of usb_gadget_handle_interrupts()
52 			 * calls is necessary to assure correct transmission
53 			 * completion with dfu-util
54 			 */
55 			if (++i == 10000)
56 				goto exit;
57 		}
58 
59 		if (ctrlc())
60 			goto exit;
61 
62 		if (dfu_get_defer_flush()) {
63 			/*
64 			 * Call to usb_gadget_handle_interrupts() is necessary
65 			 * to act on ZLP OUT transaction from HOST PC after
66 			 * transmitting the whole file.
67 			 *
68 			 * If this ZLP OUT packet is NAK'ed, the HOST libusb
69 			 * function fails after timeout (by default it is set to
70 			 * 5 seconds). In such situation the dfu-util program
71 			 * exits with error message.
72 			 */
73 			usb_gadget_handle_interrupts(usbctrl_index);
74 			ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
75 			dfu_set_defer_flush(NULL);
76 			if (ret) {
77 				pr_err("Deferred dfu_flush() failed!");
78 				goto exit;
79 			}
80 		}
81 
82 		WATCHDOG_RESET();
83 		usb_gadget_handle_interrupts(usbctrl_index);
84 	}
85 exit:
86 	g_dnl_unregister();
87 	usb_gadget_release(usbctrl_index);
88 
89 	if (dfu_reset)
90 		do_reset(NULL, 0, 0, NULL);
91 
92 	g_dnl_clear_detach();
93 
94 	return ret;
95 }
96