src/mainboard/google/gale/boardid.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <boardid.h>
   4 #include <gpio.h>
   5 #include <console/console.h>
   6
   7 /*
   8  * Gale boards dedicate to the board ID three GPIOs in ternary mode: 64, 65
   9  * and 66.
  10  */
  11
  12 static int board_id_value = -1;
  13
  14 static uint8_t get_board_id(void)
  15 {
  16         uint8_t bid;
  17         gpio_t hw_rev_gpios[] = {[2] = 66, [1] = 65, [0] = 64}; /* 64 is LSB */
  18
  19         bid = gpio_binary_first_base3_value(hw_rev_gpios,
  20                 ARRAY_SIZE(hw_rev_gpios));
  21         printk(BIOS_INFO, "Board ID %d\n", bid);
  22
  23         return bid;
  24 }
  25
  26 uint32_t board_id(void)
  27 {
  28         if (board_id_value < 0)
  29                 board_id_value = get_board_id();
  30
  31         return board_id_value;
  32 }