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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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc.
*/
#include <console/console.h>
#include <stdint.h>
#include <device/device.h>
#include <device/path.h>
#include <device/smbus.h>
struct bus *get_pbus_smbus(device_t dev)
{
struct bus *pbus = dev->bus;
while (pbus && pbus->dev && !ops_smbus_bus(pbus))
pbus = pbus->dev->bus;
if (!pbus || !pbus->dev || !pbus->dev->ops
|| !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(device_t 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_quick_read(device_t dev)
{
CHECK_PRESENCE(quick_read);
return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev);
}
int smbus_quick_write(device_t dev)
{
CHECK_PRESENCE(quick_write);
return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev);
}
int smbus_recv_byte(device_t dev)
{
CHECK_PRESENCE(recv_byte);
return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev);
}
int smbus_send_byte(device_t dev, u8 byte)
{
CHECK_PRESENCE(send_byte);
return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte);
}
int smbus_read_byte(device_t dev, u8 addr)
{
CHECK_PRESENCE(read_byte);
return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr);
}
int smbus_write_byte(device_t dev, u8 addr, u8 val)
{
CHECK_PRESENCE(write_byte);
return ops_smbus_bus(get_pbus_smbus(dev))->write_byte(dev, addr, val);
}
int smbus_read_word(device_t dev, u8 addr)
{
CHECK_PRESENCE(read_word);
return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr);
}
int smbus_write_word(device_t dev, u8 addr, u16 val)
{
CHECK_PRESENCE(write_word);
return ops_smbus_bus(get_pbus_smbus(dev))->write_word(dev, addr, val);
}
int smbus_process_call(device_t dev, u8 cmd, u16 data)
{
CHECK_PRESENCE(process_call);
return ops_smbus_bus(get_pbus_smbus(dev))->process_call(dev, cmd, data);
}
int smbus_block_read(device_t 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(device_t 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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