src/ec/acpi/ec.c

   1 /*
   2  * This file is part of the coreboot project.
   3  *
   4  * Copyright (C) 2008-2009 coresystems GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; version 2 of
   9  * the License.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc.
  19  */
  20
  21 #include <console/console.h>
  22 #include <device/device.h>
  23 #include <arch/io.h>
  24 #include <delay.h>
  25 #include "ec.h"
  26
  27 #ifdef __PRE_RAM__
  28
  29 static const int ec_cmd_reg = EC_SC;
  30 static const int ec_data_reg = EC_DATA;
  31
  32 #else
  33
  34 static int ec_cmd_reg = EC_SC;
  35 static int ec_data_reg = EC_DATA;
  36
  37 #endif
  38
  39 int send_ec_command(u8 command)
  40 {
  41         int timeout;
  42
  43         timeout = 0x7ff;
  44         while ((inb(ec_cmd_reg) & EC_IBF) && --timeout) {
  45                 udelay(10);
  46                 if ((timeout & 0xff) == 0)
  47                         printk(BIOS_SPEW, ".");
  48         }
  49         if (!timeout) {
  50                 printk(BIOS_DEBUG, "Timeout while sending command 0x%02x to EC!\n",
  51                                 command);
  52                 // return -1;
  53         }
  54
  55         udelay(10);
  56
  57         outb(command, ec_cmd_reg);
  58         return 0;
  59 }
  60
  61 int send_ec_data(u8 data)
  62 {
  63         int timeout;
  64
  65         timeout = 0x7ff;
  66         while ((inb(ec_cmd_reg) & EC_IBF) && --timeout) { // wait for IBF = 0
  67                 udelay(10);
  68                 if ((timeout & 0xff) == 0)
  69                         printk(BIOS_SPEW, ".");
  70         }
  71         if (!timeout) {
  72                 printk(BIOS_DEBUG, "Timeout while sending data 0x%02x to EC!\n",
  73                                 data);
  74                 // return -1;
  75         }
  76
  77         udelay(10);
  78
  79         outb(data, ec_data_reg);
  80
  81         return 0;
  82 }
  83
  84 int send_ec_data_nowait(u8 data)
  85 {
  86         outb(data, ec_data_reg);
  87
  88         return 0;
  89 }
  90
  91 u8 recv_ec_data(void)
  92 {
  93         int timeout;
  94         u8 data;
  95
  96         timeout = 0x7fff;
  97         while (--timeout) { // Wait for OBF = 1
  98                 if (inb(ec_cmd_reg) & EC_OBF) {
  99                         break;
 100                 }
 101                 udelay(10);
 102                 if ((timeout & 0xff) == 0)
 103                         printk(BIOS_SPEW, ".");
 104         }
 105         if (!timeout) {
 106                 printk(BIOS_DEBUG, "\nTimeout while receiving data from EC!\n");
 107                 // return -1;
 108         }
 109
 110         udelay(10);
 111
 112         data = inb(ec_data_reg);
 113         printk(BIOS_SPEW, "recv_ec_data: 0x%02x\n", data);
 114
 115         return data;
 116 }
 117
 118 u8 ec_read(u8 addr)
 119 {
 120         send_ec_command(0x80);
 121         send_ec_data(addr);
 122
 123         return recv_ec_data();
 124 }
 125
 126 int ec_write(u8 addr, u8 data)
 127 {
 128         send_ec_command(0x81);
 129         send_ec_data(addr);
 130         return send_ec_data(data);
 131 }
 132
 133 u8 ec_query(void)
 134 {
 135         send_ec_command(0x84);
 136         return recv_ec_data();
 137 }
 138
 139 void ec_set_bit(u8 addr, u8 bit)
 140 {
 141         ec_write(addr, ec_read(addr) | (1 << bit));
 142 }
 143
 144 void ec_clr_bit(u8 addr, u8 bit)
 145 {
 146         ec_write(addr, ec_read(addr) &  ~(1 << bit));
 147 }
 148
 149 #ifndef __PRE_RAM__
 150
 151 void ec_set_ports(u16 cmd_reg, u16 data_reg)
 152 {
 153         ec_cmd_reg = cmd_reg;
 154         ec_data_reg = data_reg;
 155 }
 156
 157 #endif
 158
 159 #if !defined(__SMM__) && !defined(__PRE_RAM__)
 160 struct chip_operations ec_acpi_ops = {
 161         CHIP_NAME("ACPI Embedded Controller")
 162 };
 163 #endif