/* * 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 <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)) { if (pbus->dev->bus != pbus) { pbus = pbus->dev->bus; } else { printk(BIOS_WARNING, "%s Find SMBus bus operations: unable to proceed\n", dev_path(dev)); break; } } 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); }