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