| /* |
| * 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); |
| } |