src/devices/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  * 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
  28 struct 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  */
  54 int 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
  82 int smbus_quick_read(device_t dev)
  83 {
  84         return ops_smbus_bus(get_pbus_smbus(dev))->quick_read(dev);
  85 }
  86
  87 int smbus_quick_write(device_t dev)
  88 {
  89         return ops_smbus_bus(get_pbus_smbus(dev))->quick_write(dev);
  90 }
  91
  92 int smbus_recv_byte(device_t dev)
  93 {
  94         return ops_smbus_bus(get_pbus_smbus(dev))->recv_byte(dev);
  95 }
  96
  97 int smbus_send_byte(device_t dev, u8 byte)
  98 {
  99         return ops_smbus_bus(get_pbus_smbus(dev))->send_byte(dev, byte);
 100 }
 101
 102 int smbus_read_byte(device_t dev, u8 addr)
 103 {
 104         return ops_smbus_bus(get_pbus_smbus(dev))->read_byte(dev, addr);
 105 }
 106
 107 int 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
 112 int smbus_read_word(device_t dev, u8 addr)
 113 {
 114         return ops_smbus_bus(get_pbus_smbus(dev))->read_word(dev, addr);
 115 }
 116
 117 int 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
 122 int 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
 127 int 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
 133 int 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 }