src/device/smbus_ops.c

   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
  18 #include <console/console.h>
  19 #include <stdint.h>
  20 #include <device/device.h>
  21 #include <device/path.h>
  22 #include <device/smbus.h>
  23
  24 struct bus *get_pbus_smbus(device_t dev)
  25 {
  26         struct bus *pbus = dev->bus;
  27
  28         while (pbus && pbus->dev && !ops_smbus_bus(pbus)) {
  29                 if (pbus->dev->bus != pbus) {
  30                         pbus = pbus->dev->bus;
  31                 }
  32                 else {
  33                         printk(BIOS_WARNING,
  34                                 "%s Find SMBus bus operations: unable to proceed\n",
  35                                 dev_path(dev));
  36                         break;
  37                 }
  38         }
  39
  40         if (!pbus || !pbus->dev || !pbus->dev->ops
  41             || !pbus->dev->ops->ops_smbus_bus) {
  42                 printk(BIOS_ALERT, "%s Cannot find SMBus bus operations",
  43                        dev_path(dev));
  44                 die("");
  45         }
  46
  47         return pbus;
  48 }
  49
  50 /*
  51  * Multi-level I2C MUX? May need to find the first I2C device and then set link
  52  * down to current dev.
  53  *
  54  * 1 store get_pbus_smbus list link
  55  * 2 reverse the link and call set link.
  56  *
  57  * @param dev TODO.
  58  */
  59 int smbus_set_link(device_t dev)
  60 {
  61         struct bus *pbus_a[4]; // 4 level mux only. Enough?
  62         struct bus *pbus = dev->bus;
  63         int pbus_num = 0;
  64         int i;
  65
  66         while (pbus && pbus->dev && (pbus->dev->path.type == DEVICE_PATH_I2C)) {
  67                 pbus_a[pbus_num++] = pbus;
  68                 pbus = pbus->dev->bus;
  69         }
  70
  71         // printk(BIOS_INFO, "smbus_set_link: ");
  72         for (i = pbus_num - 1; i >= 0; i--) {
  73                 // printk(BIOS_INFO, " %s[%d] -> ", dev_path(pbus_a[i]->dev),
  74                 // pbus_a[i]->link);
  75                 if (ops_smbus_bus(get_pbus_smbus(pbus_a[i]->dev))) {
  76                         if (pbus_a[i]->dev->ops
  77                             && pbus_a[i]->dev->ops->set_link)
  78                                 pbus_a[i]->dev->ops->set_link(pbus_a[i]->dev,
  79                                                         pbus_a[i]->link_num);
  80                 }
  81         }
  82         // printk(BIOS_INFO, " %s\n", dev_path(dev));
  83
  84         return pbus_num;
  85 }
  86
  87 #define CHECK_PRESENCE(x)                                      \
  88         if (!ops_smbus_bus(get_pbus_smbus(dev))->x) {          \
  89                 printk(BIOS_ERR, "%s missing " #x "\n",        \
  90                        dev_path(dev));                         \
  91                 return -1;                                     \
  92         }
  93
  94
  95 int smbus_quick_read(device_t dev)
  96 {
  97         CHECK_PRESENCE(quick_read);
  98
  99         return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev);
 100 }
 101
 102 int smbus_quick_write(device_t dev)
 103 {
 104         CHECK_PRESENCE(quick_write);
 105
 106         return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev);
 107 }
 108
 109 int smbus_recv_byte(device_t dev)
 110 {
 111         CHECK_PRESENCE(recv_byte);
 112
 113         return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev);
 114 }
 115
 116 int smbus_send_byte(device_t dev, u8 byte)
 117 {
 118         CHECK_PRESENCE(send_byte);
 119
 120         return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte);
 121 }
 122
 123 int smbus_read_byte(device_t dev, u8 addr)
 124 {
 125         CHECK_PRESENCE(read_byte);
 126
 127         return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr);
 128 }
 129
 130 int smbus_write_byte(device_t dev, u8 addr, u8 val)
 131 {
 132         CHECK_PRESENCE(write_byte);
 133
 134         return ops_smbus_bus(get_pbus_smbus(dev))->write_byte(dev, addr, val);
 135 }
 136
 137 int smbus_read_word(device_t dev, u8 addr)
 138 {
 139         CHECK_PRESENCE(read_word);
 140
 141         return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr);
 142 }
 143
 144 int smbus_write_word(device_t dev, u8 addr, u16 val)
 145 {
 146         CHECK_PRESENCE(write_word);
 147
 148         return ops_smbus_bus(get_pbus_smbus(dev))->write_word(dev, addr, val);
 149 }
 150
 151 int smbus_process_call(device_t dev, u8 cmd, u16 data)
 152 {
 153         CHECK_PRESENCE(process_call);
 154
 155         return ops_smbus_bus(get_pbus_smbus(dev))->process_call(dev, cmd, data);
 156 }
 157
 158 int smbus_block_read(device_t dev, u8 cmd, u8 bytes, u8 *buffer)
 159 {
 160         CHECK_PRESENCE(block_read);
 161
 162         return ops_smbus_bus(get_pbus_smbus(dev))->block_read(dev, cmd,
 163                                                               bytes, buffer);
 164 }
 165
 166 int smbus_block_write(device_t dev, u8 cmd, u8 bytes, const u8 *buffer)
 167 {
 168         CHECK_PRESENCE(block_write);
 169
 170         return ops_smbus_bus(get_pbus_smbus(dev))->block_write(dev, cmd,
 171                                                                bytes, buffer);
 172 }