1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2008 - 2009
4 * Windriver, <www.windriver.com>
5 * Tom Rix <Tom.Rix@windriver.com>
6 *
7 * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
8 *
9 * Copyright 2014 Linaro, Ltd.
10 * Rob Herring <robh@kernel.org>
11 */
12
13 #include <common.h>
14 #include <fastboot.h>
15 #include <net/fastboot.h>
16
17 /**
18 * fastboot_buf_addr - base address of the fastboot download buffer
19 */
20 void *fastboot_buf_addr;
21
22 /**
23 * fastboot_buf_size - size of the fastboot download buffer
24 */
25 u32 fastboot_buf_size;
26
27 /**
28 * fastboot_progress_callback - callback executed during long operations
29 */
30 void (*fastboot_progress_callback)(const char *msg);
31
32 /**
33 * fastboot_response() - Writes a response of the form "$tag$reason".
34 *
35 * @tag: The first part of the response
36 * @response: Pointer to fastboot response buffer
37 * @format: printf style format string
38 */
fastboot_response(const char * tag,char * response,const char * format,...)39 void fastboot_response(const char *tag, char *response,
40 const char *format, ...)
41 {
42 va_list args;
43
44 strlcpy(response, tag, FASTBOOT_RESPONSE_LEN);
45 if (format) {
46 va_start(args, format);
47 vsnprintf(response + strlen(response),
48 FASTBOOT_RESPONSE_LEN - strlen(response) - 1,
49 format, args);
50 va_end(args);
51 }
52 }
53
54 /**
55 * fastboot_fail() - Write a FAIL response of the form "FAIL$reason".
56 *
57 * @reason: Pointer to returned reason string
58 * @response: Pointer to fastboot response buffer
59 */
fastboot_fail(const char * reason,char * response)60 void fastboot_fail(const char *reason, char *response)
61 {
62 fastboot_response("FAIL", response, "%s", reason);
63 }
64
65 /**
66 * fastboot_okay() - Write an OKAY response of the form "OKAY$reason".
67 *
68 * @reason: Pointer to returned reason string, or NULL to send a bare "OKAY"
69 * @response: Pointer to fastboot response buffer
70 */
fastboot_okay(const char * reason,char * response)71 void fastboot_okay(const char *reason, char *response)
72 {
73 if (reason)
74 fastboot_response("OKAY", response, "%s", reason);
75 else
76 fastboot_response("OKAY", response, NULL);
77 }
78
79 /**
80 * fastboot_set_reboot_flag() - Set flag to indicate reboot-bootloader
81 *
82 * Set flag which indicates that we should reboot into the bootloader
83 * following the reboot that fastboot executes after this function.
84 *
85 * This function should be overridden in your board file with one
86 * which sets whatever flag your board specific Android bootloader flow
87 * requires in order to re-enter the bootloader.
88 */
fastboot_set_reboot_flag(void)89 int __weak fastboot_set_reboot_flag(void)
90 {
91 return -ENOSYS;
92 }
93
94 /**
95 * fastboot_get_progress_callback() - Return progress callback
96 *
97 * Return: Pointer to function called during long operations
98 */
fastboot_get_progress_callback(void)99 void (*fastboot_get_progress_callback(void))(const char *)
100 {
101 return fastboot_progress_callback;
102 }
103
104 /**
105 * fastboot_boot() - Execute fastboot boot command
106 *
107 * If ${fastboot_bootcmd} is set, run that command to execute the boot
108 * process, if that returns, then exit the fastboot server and return
109 * control to the caller.
110 *
111 * Otherwise execute "bootm <fastboot_buf_addr>", if that fails, reset
112 * the board.
113 */
fastboot_boot(void)114 void fastboot_boot(void)
115 {
116 char *s;
117
118 s = env_get("fastboot_bootcmd");
119 if (s) {
120 run_command(s, CMD_FLAG_ENV);
121 } else {
122 static char boot_addr_start[20];
123 static char *const bootm_args[] = {
124 "bootm", boot_addr_start, NULL
125 };
126
127 snprintf(boot_addr_start, sizeof(boot_addr_start) - 1,
128 "0x%p", fastboot_buf_addr);
129 printf("Booting kernel at %s...\n\n\n", boot_addr_start);
130
131 do_bootm(NULL, 0, 2, bootm_args);
132
133 /*
134 * This only happens if image is somehow faulty so we start
135 * over. We deliberately leave this policy to the invocation
136 * of fastbootcmd if that's what's being run
137 */
138 do_reset(NULL, 0, 0, NULL);
139 }
140 }
141
142 /**
143 * fastboot_set_progress_callback() - set progress callback
144 *
145 * @progress: Pointer to progress callback
146 *
147 * Set a callback which is invoked periodically during long running operations
148 * (flash and erase). This can be used (for example) by the UDP transport to
149 * send INFO responses to keep the client alive whilst those commands are
150 * executing.
151 */
fastboot_set_progress_callback(void (* progress)(const char * msg))152 void fastboot_set_progress_callback(void (*progress)(const char *msg))
153 {
154 fastboot_progress_callback = progress;
155 }
156
157 /*
158 * fastboot_init() - initialise new fastboot protocol session
159 *
160 * @buf_addr: Pointer to download buffer, or NULL for default
161 * @buf_size: Size of download buffer, or zero for default
162 */
fastboot_init(void * buf_addr,u32 buf_size)163 void fastboot_init(void *buf_addr, u32 buf_size)
164 {
165 fastboot_buf_addr = buf_addr ? buf_addr :
166 (void *)CONFIG_FASTBOOT_BUF_ADDR;
167 fastboot_buf_size = buf_size ? buf_size : CONFIG_FASTBOOT_BUF_SIZE;
168 fastboot_set_progress_callback(NULL);
169 }
170