Morgan Tsai | 1602dd5 | 2007-10-29 21:00:14 +0000 | [diff] [blame] | 1 | /* |
Stefan Reinauer | 7e61e45 | 2008-01-18 10:35:56 +0000 | [diff] [blame^] | 2 | * This file is part of the coreboot project. |
Morgan Tsai | 1602dd5 | 2007-10-29 21:00:14 +0000 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2004 Tyan Computer |
| 5 | * Written by Yinghai Lu <yhlu@tyan.com> for Tyan Computer. |
| 6 | * Copyright (C) 2006,2007 AMD |
| 7 | * Written by Yinghai Lu <yinghai.lu@amd.com> for AMD. |
| 8 | * Copyright (C) 2007 Silicon Integrated Systems Corp. (SiS) |
| 9 | * Written by Morgan Tsai <my_tsai@sis.com> for SiS. |
| 10 | * |
| 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License as published by |
| 13 | * the Free Software Foundation; either version 2 of the License, or |
| 14 | * (at your option) any later version. |
| 15 | * |
| 16 | * This program is distributed in the hope that it will be useful, |
| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | * GNU General Public License for more details. |
| 20 | * |
| 21 | * You should have received a copy of the GNU General Public License |
| 22 | * along with this program; if not, write to the Free Software |
| 23 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 24 | */ |
| 25 | |
| 26 | #include <device/smbus_def.h> |
| 27 | |
| 28 | #define SMBHSTSTAT 0x1 |
| 29 | #define SMBHSTPRTCL 0x0 |
| 30 | #define SMBHSTCMD 0x3 |
| 31 | #define SMBXMITADD 0x2 |
| 32 | #define SMBHSTDAT0 0x4 |
| 33 | #define SMBHSTDAT1 0x5 |
| 34 | |
| 35 | /* Between 1-10 seconds, We should never timeout normally |
| 36 | * Longer than this is just painful when a timeout condition occurs. |
| 37 | */ |
| 38 | #define SMBUS_TIMEOUT (100*1000*10) |
| 39 | |
| 40 | static inline void smbus_delay(void) |
| 41 | { |
| 42 | outb(0x80, 0x80); |
| 43 | } |
| 44 | |
| 45 | static int smbus_wait_until_ready(unsigned smbus_io_base) |
| 46 | { |
| 47 | unsigned long loops; |
| 48 | loops = SMBUS_TIMEOUT; |
| 49 | do { |
| 50 | unsigned char val; |
| 51 | smbus_delay(); |
| 52 | val = inb(smbus_io_base + SMBHSTSTAT); |
| 53 | val &= 0x1f; |
| 54 | if (val == 0) { |
| 55 | return 0; |
| 56 | } |
| 57 | outb(val,smbus_io_base + SMBHSTSTAT); |
| 58 | } while(--loops); |
| 59 | return -2; |
| 60 | } |
| 61 | |
| 62 | static int smbus_wait_until_done(unsigned smbus_io_base) |
| 63 | { |
| 64 | unsigned long loops; |
| 65 | loops = SMBUS_TIMEOUT; |
| 66 | do { |
| 67 | unsigned char val; |
| 68 | smbus_delay(); |
| 69 | |
| 70 | val = inb(smbus_io_base + 0x00); |
| 71 | if ( (val & 0xff) != 0x02) { |
| 72 | return 0; |
| 73 | } |
| 74 | } while(--loops); |
| 75 | return -3; |
| 76 | } |
| 77 | static int do_smbus_recv_byte(unsigned smbus_io_base, unsigned device) |
| 78 | { |
| 79 | unsigned char global_status_register; |
| 80 | unsigned char byte; |
| 81 | |
| 82 | /* set the device I'm talking too */ |
| 83 | outb(((device & 0x7f) << 1)|1 , smbus_io_base + SMBXMITADD); |
| 84 | smbus_delay(); |
| 85 | |
| 86 | /* byte data recv */ |
| 87 | outb(0x05, smbus_io_base + SMBHSTPRTCL); |
| 88 | smbus_delay(); |
| 89 | |
| 90 | /* poll for transaction completion */ |
| 91 | if (smbus_wait_until_done(smbus_io_base) < 0) { |
| 92 | return -3; |
| 93 | } |
| 94 | |
| 95 | global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */ |
| 96 | |
| 97 | /* read results of transaction */ |
| 98 | byte = inb(smbus_io_base + SMBHSTCMD); |
| 99 | |
| 100 | if (global_status_register != 0x80) { // lose check, otherwise it should be 0 |
| 101 | return -1; |
| 102 | } |
| 103 | return byte; |
| 104 | } |
| 105 | static int do_smbus_send_byte(unsigned smbus_io_base, unsigned device, unsigned char val) |
| 106 | { |
| 107 | unsigned global_status_register; |
| 108 | |
| 109 | outb(val, smbus_io_base + SMBHSTDAT0); |
| 110 | smbus_delay(); |
| 111 | |
| 112 | /* set the command... */ |
| 113 | outb(val, smbus_io_base + SMBHSTCMD); |
| 114 | smbus_delay(); |
| 115 | |
| 116 | /* set the device I'm talking too */ |
| 117 | outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBXMITADD); |
| 118 | smbus_delay(); |
| 119 | |
| 120 | /* set up for a byte data write */ |
| 121 | outb(0x04, smbus_io_base + SMBHSTPRTCL); |
| 122 | smbus_delay(); |
| 123 | |
| 124 | /* poll for transaction completion */ |
| 125 | if (smbus_wait_until_done(smbus_io_base) < 0) { |
| 126 | return -3; |
| 127 | } |
| 128 | global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */; |
| 129 | |
| 130 | if (global_status_register != 0x80) { |
| 131 | return -1; |
| 132 | } |
| 133 | return 0; |
| 134 | } |
| 135 | static int do_smbus_read_byte(unsigned smbus_io_base, unsigned device, unsigned address) |
| 136 | { |
| 137 | unsigned char global_status_register; |
| 138 | unsigned char byte; |
| 139 | |
| 140 | outb(0xff, smbus_io_base + 0x00); |
| 141 | smbus_delay(); |
| 142 | outb(0x20, smbus_io_base + 0x03); |
| 143 | smbus_delay(); |
| 144 | |
| 145 | outb(((device & 0x7f) << 1)|1 , smbus_io_base + 0x04); |
| 146 | smbus_delay(); |
| 147 | outb(address & 0xff, smbus_io_base + 0x05); |
| 148 | smbus_delay(); |
| 149 | outb(0x12, smbus_io_base + 0x03); |
| 150 | smbus_delay(); |
| 151 | |
| 152 | int i,j; |
| 153 | for(i=0;i<0x1000;i++) |
| 154 | { |
| 155 | if (inb(smbus_io_base + 0x00) != 0x08) |
| 156 | { smbus_delay(); |
| 157 | for(j=0;j<0xFFFF;j++); |
| 158 | } |
| 159 | }; |
| 160 | |
Morgan Tsai | 218c265 | 2007-11-02 16:09:58 +0000 | [diff] [blame] | 161 | global_status_register = inb(smbus_io_base + 0x00); |
Morgan Tsai | 1602dd5 | 2007-10-29 21:00:14 +0000 | [diff] [blame] | 162 | byte = inb(smbus_io_base + 0x08); |
| 163 | |
| 164 | if (global_status_register != 0x08) { // lose check, otherwise it should be 0 |
| 165 | print_debug("Fail");print_debug("\r\t"); |
| 166 | return -1; |
| 167 | } |
Morgan Tsai | 218c265 | 2007-11-02 16:09:58 +0000 | [diff] [blame] | 168 | print_debug("Success");print_debug("\r\t"); |
Morgan Tsai | 1602dd5 | 2007-10-29 21:00:14 +0000 | [diff] [blame] | 169 | return byte; |
| 170 | } |
| 171 | |
| 172 | |
| 173 | static int do_smbus_write_byte(unsigned smbus_io_base, unsigned device, unsigned address, unsigned char val) |
| 174 | { |
| 175 | unsigned global_status_register; |
| 176 | |
| 177 | outb(val, smbus_io_base + SMBHSTDAT0); |
| 178 | smbus_delay(); |
| 179 | |
| 180 | /* set the device I'm talking too */ |
| 181 | outb(((device & 0x7f) << 1) | 0, smbus_io_base + SMBXMITADD); |
| 182 | smbus_delay(); |
| 183 | |
| 184 | outb(address & 0xff, smbus_io_base + SMBHSTCMD); |
| 185 | smbus_delay(); |
| 186 | |
| 187 | /* set up for a byte data write */ |
| 188 | outb(0x06, smbus_io_base + SMBHSTPRTCL); |
| 189 | smbus_delay(); |
| 190 | |
| 191 | /* poll for transaction completion */ |
| 192 | if (smbus_wait_until_done(smbus_io_base) < 0) { |
| 193 | return -3; |
| 194 | } |
| 195 | global_status_register = inb(smbus_io_base + SMBHSTSTAT) & 0x80; /* lose check */; |
| 196 | |
| 197 | if (global_status_register != 0x80) { |
| 198 | return -1; |
| 199 | } |
| 200 | return 0; |
| 201 | } |
| 202 | |