blob: 879bc23dd39e8001c017678d9ebcecb29f02a6fc [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
*
* 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, either version 2 of the License, or
* (at your option) any later version.
*
* 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 "via_early_smbus.h"
/**
* \brief Wait for the SMBus to become ready to process a new transaction.
*
* @param smbus_dev The base SMBus IO port
*/
int smbus_wait_until_ready(u32 smbus_dev)
{
int loops;
printsmbus("Waiting until SMBus ready\n");
/* Loop up to SMBUS_TIMEOUT times, waiting for bit 0 of the
* SMBus Host Status register to go to 0, indicating the operation
* was completed successfully. I don't remember why I did it this way,
* but I think it was because ROMCC was running low on registers */
loops = 0;
while (smbus_is_busy(smbus_dev) && loops < SMBUS_TIMEOUT)
++loops;
return smbus_print_error(smbus_dev, inb(SMBHSTSTAT(smbus_dev)), loops);
}