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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2004 Tyan
* (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
* Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov>
*
* 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 <stdint.h>
#include <console/console.h>
#include <device/device.h>
#include <device/smbus.h>
struct bus *get_pbus_smbus(struct device *dev)
{
struct bus *const pbus = i2c_link(dev);
if (!pbus->dev->ops->ops_smbus_bus) {
printk(BIOS_ALERT, "%s Cannot find SMBus bus operations",
dev_path(dev));
die("");
}
return pbus;
}
/*
* Multi-level I2C MUX? May need to find the first I2C device and then set link
* down to current dev.
*
* 1 store get_pbus_smbus list link
* 2 reverse the link and call set link.
*
* @param dev TODO.
*/
int smbus_set_link(struct device *dev)
{
struct bus *pbus_a[4]; // 4 level mux only. Enough?
struct bus *pbus = dev->bus;
int pbus_num = 0;
int i;
while (pbus && pbus->dev && (pbus->dev->path.type == DEVICE_PATH_I2C)) {
pbus_a[pbus_num++] = pbus;
pbus = pbus->dev->bus;
}
// printk(BIOS_INFO, "smbus_set_link: ");
for (i = pbus_num - 1; i >= 0; i--) {
// printk(BIOS_INFO, " %s[%d] -> ", dev_path(pbus_a[i]->dev),
// pbus_a[i]->link);
if (ops_smbus_bus(get_pbus_smbus(pbus_a[i]->dev))) {
if (pbus_a[i]->dev->ops
&& pbus_a[i]->dev->ops->set_link)
pbus_a[i]->dev->ops->set_link(pbus_a[i]->dev,
pbus_a[i]->link_num);
}
}
// printk(BIOS_INFO, " %s\n", dev_path(dev));
return pbus_num;
}
#define CHECK_PRESENCE(x) \
if (!ops_smbus_bus(get_pbus_smbus(dev))->x) { \
printk(BIOS_ERR, "%s missing " #x "\n", \
dev_path(dev)); \
return -1; \
}
int smbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buffer)
{
CHECK_PRESENCE(block_read);
return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd,
bytes, buffer);
}
int smbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buffer)
{
CHECK_PRESENCE(block_write);
return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd,
bytes, buffer);
}
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