LXR coreboot/src/devices/smbus

   1/*
   2 * This file is part of the coreboot project.
   3 *
   4 * Copyright (C) 2004 Tyan
   5 * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
   6 * Copyright (C) 2004 Li-Ta Lo <ollie@lanl.gov>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; version 2 of the License.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 *
  17 * You should have received a copy of the GNU General Public License
  18 * along with this program; if not, write to the Free Software
  19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
  20 */
  21
  22#include <console/console.h>
  23#include <stdint.h>
  24#include <device/device.h>
  25#include <device/path.h>
  26#include <device/smbus.h>
  27
  28struct bus *get_pbus_smbus(device_t dev)
  29{
  30        struct bus *pbus = dev->bus;
  31
  32        while (pbus && pbus->dev && !ops_smbus_bus(pbus))
  33                pbus = pbus->dev->bus;
  34
  35        if (!pbus || !pbus->dev || !pbus->dev->ops
  36            || !pbus->dev->ops->ops_smbus_bus) {
  37                printk(BIOS_ALERT, "%s Cannot find SMBus bus operations",
  38                       dev_path(dev));
  39                die("");
  40        }
  41
  42        return pbus;
  43}
  44
  45/*
  46 * Multi-level I2C MUX? May need to find the first I2C device and then set link
  47 * down to current dev.
  48 *
  49 * 1 store get_pbus_smbus list link
  50 * 2 reverse the link and call set link.
  51 *
  52 * @param dev TODO.
  53 */
  54int smbus_set_link(device_t dev)
  55{
  56        struct bus *pbus_a[4]; // 4 level mux only. Enough?
  57        struct bus *pbus = dev->bus;
  58        int pbus_num = 0;
  59        int i;
  60
  61        while (pbus && pbus->dev && (pbus->dev->path.type == DEVICE_PATH_I2C)) {
  62                pbus_a[pbus_num++] = pbus;
  63                pbus = pbus->dev->bus;
  64        }
  65
  66        // printk(BIOS_INFO, "smbus_set_link: ");
  67        for (i = pbus_num - 1; i >= 0; i--) {
  68                // printk(BIOS_INFO, " %s[%d] -> ", dev_path(pbus_a[i]->dev),
  69                // pbus_a[i]->link);
  70                if (ops_smbus_bus(get_pbus_smbus(pbus_a[i]->dev))) {
  71                        if (pbus_a[i]->dev->ops
  72                            && pbus_a[i]->dev->ops->set_link)
  73                                pbus_a[i]->dev->ops->set_link(pbus_a[i]->dev,
  74                                                        pbus_a[i]->link_num);
  75                }
  76        }
  77        // printk(BIOS_INFO, " %s\n", dev_path(dev));
  78
  79        return pbus_num;
  80}
  81
  82int smbus_quick_read(device_t dev)
  83{
  84        return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev);
  85}
  86
  87int smbus_quick_write(device_t dev)
  88{
  89        return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev);
  90}
  91
  92int smbus_recv_byte(device_t dev)
  93{
  94        return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev);
  95}
  96
  97int smbus_send_byte(device_t dev, u8 byte)
  98{
  99        return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte);
 100}
 101
 102int smbus_read_byte(device_t dev, u8 addr)
 103{
 104        return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr);
 105}
 106
 107int smbus_write_byte(device_t dev, u8 addr, u8 val)
 108{
 109        return ops_smbus_bus(get_pbus_smbus(dev))->write_byte(dev, addr, val);
 110}
 111
 112int smbus_read_word(device_t dev, u8 addr)
 113{
 114        return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr);
 115}
 116
 117int smbus_write_word(device_t dev, u8 addr, u16 val)
 118{
 119        return ops_smbus_bus(get_pbus_smbus(dev))->write_word(dev, addr, val);
 120}
 121
 122int smbus_process_call(device_t dev, u8 cmd, u16 data)
 123{
 124        return ops_smbus_bus(get_pbus_smbus(dev))->process_call(dev, cmd, data);
 125}
 126
 127int smbus_block_read(device_t dev, u8 cmd, u8 bytes, u8 *buffer)
 128{
 129        return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd,
 130                                                              bytes, buffer);
 131}
 132
 133int smbus_block_write(device_t dev, u8 cmd, u8 bytes, const u8 *buffer)
 134{
 135        return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd,
 136                                                               bytes, buffer);
 137}
 138