common/dfu.c

   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 <command.h>
  15 #include <watchdog.h>
  16 #include <dfu.h>
  17 #include <console.h>
  18 #include <g_dnl.h>
  19 #include <usb.h>
  20 #include <net.h>
  21
  22 int run_usb_dnl_gadget(int usbctrl_index, char *usb_dnl_gadget)
  23 {
  24         bool dfu_reset = false;
  25         int ret, i = 0;
  26
  27         ret = usb_gadget_initialize(usbctrl_index);
  28         if (ret) {
  29                 pr_err("usb_gadget_initialize failed\n");
  30                 return CMD_RET_FAILURE;
  31         }
  32         g_dnl_clear_detach();
  33         ret = g_dnl_register(usb_dnl_gadget);
  34         if (ret) {
  35                 pr_err("g_dnl_register failed");
  36                 return CMD_RET_FAILURE;
  37         }
  38
  39 #ifdef CONFIG_DFU_TIMEOUT
  40         unsigned long start_time = get_timer(0);
  41 #endif
  42
  43         while (1) {
  44                 if (g_dnl_detach()) {
  45                         /*
  46                          * Check if USB bus reset is performed after detach,
  47                          * which indicates that -R switch has been passed to
  48                          * dfu-util. In this case reboot the device
  49                          */
  50                         if (dfu_usb_get_reset()) {
  51                                 dfu_reset = true;
  52                                 goto exit;
  53                         }
  54
  55                         /*
  56                          * This extra number of usb_gadget_handle_interrupts()
  57                          * calls is necessary to assure correct transmission
  58                          * completion with dfu-util
  59                          */
  60                         if (++i == 10000)
  61                                 goto exit;
  62                 }
  63
  64                 if (ctrlc())
  65                         goto exit;
  66
  67                 if (dfu_get_defer_flush()) {
  68                         /*
  69                          * Call to usb_gadget_handle_interrupts() is necessary
  70                          * to act on ZLP OUT transaction from HOST PC after
  71                          * transmitting the whole file.
  72                          *
  73                          * If this ZLP OUT packet is NAK'ed, the HOST libusb
  74                          * function fails after timeout (by default it is set to
  75                          * 5 seconds). In such situation the dfu-util program
  76                          * exits with error message.
  77                          */
  78                         usb_gadget_handle_interrupts(usbctrl_index);
  79                         ret = dfu_flush(dfu_get_defer_flush(), NULL, 0, 0);
  80                         dfu_set_defer_flush(NULL);
  81                         if (ret) {
  82                                 pr_err("Deferred dfu_flush() failed!");
  83                                 goto exit;
  84                         }
  85                 }
  86
  87 #ifdef CONFIG_DFU_TIMEOUT
  88                 unsigned long wait_time = dfu_get_timeout();
  89
  90                 if (wait_time) {
  91                         unsigned long current_time = get_timer(start_time);
  92
  93                         if (current_time > wait_time) {
  94                                 debug("Inactivity timeout, abort DFU\n");
  95                                 goto exit;
  96                         }
  97                 }
  98 #endif
  99
 100                 WATCHDOG_RESET();
 101                 usb_gadget_handle_interrupts(usbctrl_index);
 102         }
 103 exit:
 104         g_dnl_unregister();
 105         usb_gadget_release(usbctrl_index);
 106
 107         if (dfu_reset)
 108                 do_reset(NULL, 0, 0, NULL);
 109
 110         g_dnl_clear_detach();
 111
 112         return ret;
 113 }