src/mainboard/facebook/fbg1701/cpld.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <arch/io.h>
   4 #include "cpld.h"
   5
   6 /* CPLD definitions */
   7 #define CPLD_PCB_VERSION_PORT 0x283
   8 #define CPLD_PCB_VERSION_MASK 0xF0
   9 #define CPLD_PCB_VERSION_BIT 4
  10
  11 #define CPLD_RESET_PORT 0x287
  12 #define CPLD_CMD_RESET_DSI_BRIDGE_ACTIVE 0x20
  13 #define CPLD_CMD_RESET_DSI_BRIDGE_INACTIVE 0x00
  14
  15 /* Reset DSI bridge */
  16 void cpld_reset_bridge(void)
  17 {
  18         outb(CPLD_CMD_RESET_DSI_BRIDGE_ACTIVE, CPLD_RESET_PORT);
  19         outb(CPLD_CMD_RESET_DSI_BRIDGE_INACTIVE, CPLD_RESET_PORT);
  20 }
  21
  22 /* Read PCB version */
  23 unsigned int cpld_read_pcb_version(void)
  24 {
  25         return ((inb(CPLD_PCB_VERSION_PORT) & CPLD_PCB_VERSION_MASK) >> CPLD_PCB_VERSION_BIT);
  26 }