src/mainboard/protectli/vault_adl_p/board_beep.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include <delay.h>
   5
   6 #include "board_beep.h"
   7
   8 #define ITE_GPIO_BASE           0xa00
   9 #define ITE_GPIO_PIN(x)         (1 << ((x) % 10))
  10 #define ITE_GPIO_SET(x)         (((x) / 10) - 1)
  11 #define ITE_GPIO_IO_ADDR(x)     (ITE_GPIO_BASE + ITE_GPIO_SET(x))
  12
  13 void do_beep(uint32_t frequency, uint32_t duration_msec)
  14 {
  15         uint32_t timer_delay = 1000000 / frequency / 2;
  16         uint32_t count = (duration_msec * 1000) / (timer_delay * 2);
  17         uint8_t val = inb(ITE_GPIO_IO_ADDR(41)); /* GP41 drives a MOSFET for PC Speaker */
  18
  19         for (uint32_t i = 0; i < count; i++) {
  20                 outb(val | ITE_GPIO_PIN(41), ITE_GPIO_IO_ADDR(41));
  21                 udelay(timer_delay);
  22                 outb(val & ~ITE_GPIO_PIN(41), ITE_GPIO_IO_ADDR(41));
  23                 udelay(timer_delay);
  24         }
  25 }