src/southbridge/amd/cs5536/early_smbus.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2007 Advanced Micro Devices, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include "cs5536.h"
  17 #include "smbus.h"
  18
  19 /* initialization for SMBus Controller */
  20 static void cs5536_enable_smbus(void)
  21 {
  22
  23         /* Set SCL freq and enable SMB controller */
  24         /*outb((0x20 << 1) | SMB_CTRL2_ENABLE, smbus_io_base + SMB_CTRL2); */
  25         outb((0x7F << 1) | SMB_CTRL2_ENABLE, SMBUS_IO_BASE + SMB_CTRL2);
  26
  27         /* Setup SMBus host controller address to 0xEF */
  28         outb((0xEF | SMB_ADD_SAEN), SMBUS_IO_BASE + SMB_ADD);
  29
  30 }
  31
  32 static inline int smbus_read_byte(unsigned device, unsigned address)
  33 {
  34         return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
  35 }