board/logicpd/zoom2/debug_board.c

   1 /*
   2  * Copyright (c) 2009 Wind River Systems, Inc.
   3  * Tom Rix <Tom.Rix@windriver.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 #include <common.h>
   8 #include <asm/arch/cpu.h>
   9 #include <asm/io.h>
  10 #include <asm/arch/mux.h>
  11 #include <asm/gpio.h>
  12
  13 #define DEBUG_BOARD_CONNECTED           1
  14 #define DEBUG_BOARD_NOT_CONNECTED       0
  15
  16 static int debug_board_connected = DEBUG_BOARD_CONNECTED;
  17
  18 static void zoom2_debug_board_detect (void)
  19 {
  20         int val = 0;
  21
  22         if (!gpio_request(158, "")) {
  23                 /*
  24                  * GPIO to query for debug board
  25                  * 158 db board query
  26                  */
  27                 gpio_direction_input(158);
  28                 val = gpio_get_value(158);
  29         }
  30
  31         if (!val)
  32                 debug_board_connected = DEBUG_BOARD_NOT_CONNECTED;
  33 }
  34
  35 int zoom2_debug_board_connected (void)
  36 {
  37         static int first_time = 1;
  38
  39         if (first_time) {
  40                 zoom2_debug_board_detect ();
  41                 first_time = 0;
  42         }
  43         return debug_board_connected;
  44 }