src/southbridge/broadcom/bcm5785/early_smbus.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2005 AMD
   5  * Written by Yinghai Lu <yinghai.lu@amd.com> for AMD.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; version 2 of the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include "smbus.h"
  18
  19 #define SMBUS_IO_BASE 0x1000
  20
  21 static void enable_smbus(void)
  22 {
  23         pci_devfn_t dev;
  24         dev = pci_locate_device(PCI_ID(0x1166, 0x0205), 0); // 0x0201?
  25
  26         if (dev == PCI_DEV_INVALID) {
  27                 die("SMBUS controller not found\n");
  28         }
  29
  30         printk(BIOS_DEBUG, "SMBus controller enabled\n");
  31         /* set smbus iobase */
  32         pci_write_config32(dev, 0x90, SMBUS_IO_BASE | 1);
  33         /* Set smbus iospace enable */
  34         pci_write_config8(dev, 0xd2, 0x03);
  35         /* clear any lingering errors, so the transaction will run */
  36         outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT);
  37 }
  38
  39 static inline int smbus_recv_byte(unsigned device)
  40 {
  41         return do_smbus_recv_byte(SMBUS_IO_BASE, device);
  42 }
  43
  44 static inline int smbus_send_byte(unsigned device, unsigned char val)
  45 {
  46         return do_smbus_send_byte(SMBUS_IO_BASE, device, val);
  47 }
  48
  49 static inline int smbus_read_byte(unsigned device, unsigned address)
  50 {
  51         return do_smbus_read_byte(SMBUS_IO_BASE, device, address);
  52 }
  53
  54 static inline int smbus_write_byte(unsigned device, unsigned address, unsigned char val)
  55 {
  56         return do_smbus_write_byte(SMBUS_IO_BASE, device, address, val);
  57 }