diff options
Diffstat (limited to 'src/southbridge/intel/i82801dx/smbus.c')
-rw-r--r-- | src/southbridge/intel/i82801dx/smbus.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/src/southbridge/intel/i82801dx/smbus.c b/src/southbridge/intel/i82801dx/smbus.c deleted file mode 100644 index 441b45a98d..0000000000 --- a/src/southbridge/intel/i82801dx/smbus.c +++ /dev/null @@ -1,101 +0,0 @@ -/* - * This file is part of the coreboot project. - * - * Copyright (C) 2004 Ronald G. Minnich - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include "i82801dx.h" -#include <smbus.h> -#include <pci.h> -#include <arch/io.h> - -#define PM_BUS 0 -#define PM_DEVFN PCI_DEVFN(0x1f,3) - -void smbus_enable(void) -{ - unsigned char byte; - /* iobase addr */ - pcibios_write_config_dword(PM_BUS, PM_DEVFN, 0x20, SMBUS_IO_BASE | 1); - /* smbus enable */ - pcibios_write_config_byte(PM_BUS, PM_DEVFN, 0x40, 1); - /* iospace enable */ - pcibios_write_config_word(PM_BUS, PM_DEVFN, 0x4, 1); - - /* Disable interrupt generation */ - outb(0, SMBUS_IO_BASE + SMBHSTCTL); - -} - -void smbus_setup(void) -{ - outb(0, SMBUS_IO_BASE + SMBHSTSTAT); -} - -static void smbus_wait_until_ready(void) -{ - while ((inb(SMBUS_IO_BASE + SMBHSTSTAT) & 1) == 1) { - /* nop */ - } -} - -static void smbus_wait_until_done(void) -{ - unsigned char byte; - do { - byte = inb(SMBUS_IO_BASE + SMBHSTSTAT); - } - while ((byte & 1) == 1); - while ((byte & ~1) == 0) { - byte = inb(SMBUS_IO_BASE + SMBHSTSTAT); - } -} - -int smbus_read_byte(unsigned device, unsigned address, unsigned char *result) -{ - unsigned char host_status_register; - unsigned char byte; - - smbus_wait_until_ready(); - - /* setup transaction */ - /* disable interrupts */ - outb(inb(SMBUS_IO_BASE + SMBHSTCTL) & (~1), SMBUS_IO_BASE + SMBHSTCTL); - /* set the device I'm talking too */ - outb(((device & 0x7f) << 1) | 1, SMBUS_IO_BASE + SMBHSTADD); - /* set the command/address... */ - outb(address & 0xFF, SMBUS_IO_BASE + SMBHSTCMD); - /* set up for a byte data read */ - outb((inb(SMBUS_IO_BASE + SMBHSTCTL) & 0xE3) | (0x2 << 2), - SMBUS_IO_BASE + SMBHSTCTL); - - /* clear any lingering errors, so the transaction will run */ - outb(inb(SMBUS_IO_BASE + SMBHSTSTAT), SMBUS_IO_BASE + SMBHSTSTAT); - - /* clear the data byte... */ - outb(0, SMBUS_IO_BASE + SMBHSTDAT0); - - /* start the command */ - outb((inb(SMBUS_IO_BASE + SMBHSTCTL) | 0x40), - SMBUS_IO_BASE + SMBHSTCTL); - - /* poll for transaction completion */ - smbus_wait_until_done(); - - host_status_register = inb(SMBUS_IO_BASE + SMBHSTSTAT); - - /* read results of transaction */ - byte = inb(SMBUS_IO_BASE + SMBHSTDAT0); - - *result = byte; - return host_status_register != 0x02; -} |