src/mainboard/gigabyte/ga-b75m-d3h/early_init.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <bootblock_common.h>
   4 #include <superio/ite/common/ite.h>
   5 #include <superio/ite/it8728f/it8728f.h>
   6
   7 #define SUPERIO_BASE 0x2e
   8 #define SIO_GPIO PNP_DEV(SUPERIO_BASE, IT8728F_GPIO)
   9 #define SERIAL_DEV PNP_DEV(SUPERIO_BASE, 0x01)
  10
  11 void bootblock_mainboard_early_init(void)
  12 {
  13         /* Initialize SuperIO */
  14         ite_enable_serial(SERIAL_DEV, CONFIG_TTYS0_BASE);
  15
  16         ite_reg_write(SIO_GPIO, 0xEF, 0x7E); // magic SIO disable reboot
  17
  18         /* FIXME: These values could be configured in ramstage */
  19         ite_reg_write(SIO_GPIO, 0x25, 0x40); // gpio pin function -> gp16
  20         ite_reg_write(SIO_GPIO, 0x27, 0x10); // gpio pin function -> gp34
  21         ite_reg_write(SIO_GPIO, 0x2c, 0x80); // smbus isolation on parallel port
  22         ite_reg_write(SIO_GPIO, 0x62, 0x0a); // simple iobase 0xa00
  23         ite_reg_write(SIO_GPIO, 0x72, 0x20); // watchdog timeout clear!
  24         ite_reg_write(SIO_GPIO, 0x73, 0x00); // watchdog timeout clear!
  25         ite_reg_write(SIO_GPIO, 0xcb, 0x00); // simple io set4 direction -> in
  26         ite_reg_write(SIO_GPIO, 0xe9, 0x27); // bus select disable
  27         ite_reg_write(SIO_GPIO, 0xf0, 0x10); // ?
  28         ite_reg_write(SIO_GPIO, 0xf1, 0x42); // ?
  29         ite_reg_write(SIO_GPIO, 0xf6, 0x1c); // hwmon alert beep -> gp36(pin12)
  30
  31         /* EC SIO settings */
  32         ite_reg_write(IT8728F_EC, 0xf1, 0xc0);
  33         ite_reg_write(IT8728F_EC, 0xf6, 0xf0);
  34         ite_reg_write(IT8728F_EC, 0xf9, 0x48);
  35         ite_reg_write(IT8728F_EC, 0x60, 0x0a);
  36         ite_reg_write(IT8728F_EC, 0x61, 0x30);
  37         ite_reg_write(IT8728F_EC, 0x62, 0x0a);
  38         ite_reg_write(IT8728F_EC, 0x63, 0x20);
  39         ite_reg_write(IT8728F_EC, 0x30, 0x01);
  40 }