Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | i2c-viapro.c - Part of lm_sensors, Linux kernel modules for hardware |
| 3 | monitoring |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 4 | Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl>, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | Philip Edelbrock <phil@netroedge.com>, Kyösti Mälkki <kmalkki@cc.hut.fi>, |
| 6 | Mark D. Studebaker <mdsxyz123@yahoo.com> |
Jean Delvare | ab6a6ed | 2007-02-13 22:09:02 +0100 | [diff] [blame] | 7 | Copyright (C) 2005 - 2007 Jean Delvare <khali@linux-fr.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | */ |
| 23 | |
| 24 | /* |
Jean Delvare | aaf7f14 | 2005-09-22 22:09:07 +0200 | [diff] [blame] | 25 | Supports the following VIA south bridges: |
| 26 | |
| 27 | Chip name PCI ID REV I2C block |
| 28 | VT82C596A 0x3050 no |
| 29 | VT82C596B 0x3051 no |
| 30 | VT82C686A 0x3057 0x30 no |
| 31 | VT82C686B 0x3057 0x40 yes |
| 32 | VT8231 0x8235 no? |
| 33 | VT8233 0x3074 yes |
| 34 | VT8233A 0x3147 yes? |
| 35 | VT8235 0x3177 yes |
| 36 | VT8237R 0x3227 yes |
Rudolf Marek | c243353 | 2006-09-03 22:35:21 +0200 | [diff] [blame] | 37 | VT8237A 0x3337 yes |
| 38 | VT8251 0x3287 yes |
Jean Delvare | ab6a6ed | 2007-02-13 22:09:02 +0100 | [diff] [blame] | 39 | CX700 0x8324 yes |
Jean Delvare | aaf7f14 | 2005-09-22 22:09:07 +0200 | [diff] [blame] | 40 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | Note: we assume there can only be one device, with one SMBus interface. |
| 42 | */ |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <linux/module.h> |
| 45 | #include <linux/delay.h> |
| 46 | #include <linux/pci.h> |
| 47 | #include <linux/kernel.h> |
| 48 | #include <linux/stddef.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/ioport.h> |
| 50 | #include <linux/i2c.h> |
| 51 | #include <linux/init.h> |
| 52 | #include <asm/io.h> |
| 53 | |
| 54 | static struct pci_dev *vt596_pdev; |
| 55 | |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 56 | #define SMBBA1 0x90 |
| 57 | #define SMBBA2 0x80 |
| 58 | #define SMBBA3 0xD0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | /* SMBus address offsets */ |
| 61 | static unsigned short vt596_smba; |
| 62 | #define SMBHSTSTS (vt596_smba + 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | #define SMBHSTCNT (vt596_smba + 2) |
| 64 | #define SMBHSTCMD (vt596_smba + 3) |
| 65 | #define SMBHSTADD (vt596_smba + 4) |
| 66 | #define SMBHSTDAT0 (vt596_smba + 5) |
| 67 | #define SMBHSTDAT1 (vt596_smba + 6) |
| 68 | #define SMBBLKDAT (vt596_smba + 7) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | /* PCI Address Constants */ |
| 71 | |
| 72 | /* SMBus data in configuration space can be found in two places, |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 73 | We try to select the better one */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 75 | static unsigned short SMBHSTCFG = 0xD2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
| 77 | /* Other settings */ |
| 78 | #define MAX_TIMEOUT 500 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
| 80 | /* VT82C596 constants */ |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 81 | #define VT596_QUICK 0x00 |
| 82 | #define VT596_BYTE 0x04 |
| 83 | #define VT596_BYTE_DATA 0x08 |
| 84 | #define VT596_WORD_DATA 0x0C |
| 85 | #define VT596_BLOCK_DATA 0x14 |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 86 | #define VT596_I2C_BLOCK_DATA 0x34 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | |
| 89 | /* If force is set to anything different from 0, we forcibly enable the |
| 90 | VT596. DANGEROUS! */ |
| 91 | static int force; |
| 92 | module_param(force, bool, 0); |
| 93 | MODULE_PARM_DESC(force, "Forcibly enable the SMBus. DANGEROUS!"); |
| 94 | |
| 95 | /* If force_addr is set to anything different from 0, we forcibly enable |
| 96 | the VT596 at the given address. VERY DANGEROUS! */ |
| 97 | static u16 force_addr; |
| 98 | module_param(force_addr, ushort, 0); |
| 99 | MODULE_PARM_DESC(force_addr, |
| 100 | "Forcibly enable the SMBus at the given address. " |
| 101 | "EXTREMELY DANGEROUS!"); |
| 102 | |
| 103 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 104 | static struct pci_driver vt596_driver; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | static struct i2c_adapter vt596_adapter; |
| 106 | |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 107 | #define FEATURE_I2CBLOCK (1<<0) |
| 108 | static unsigned int vt596_features; |
| 109 | |
Jean Delvare | ed5453e | 2005-09-22 22:23:32 +0200 | [diff] [blame] | 110 | #ifdef DEBUG |
| 111 | static void vt596_dump_regs(const char *msg, u8 size) |
| 112 | { |
| 113 | dev_dbg(&vt596_adapter.dev, "%s: STS=%02x CNT=%02x CMD=%02x ADD=%02x " |
| 114 | "DAT=%02x,%02x\n", msg, inb_p(SMBHSTSTS), inb_p(SMBHSTCNT), |
| 115 | inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0), |
| 116 | inb_p(SMBHSTDAT1)); |
| 117 | |
| 118 | if (size == VT596_BLOCK_DATA |
| 119 | || size == VT596_I2C_BLOCK_DATA) { |
| 120 | int i; |
| 121 | |
| 122 | dev_dbg(&vt596_adapter.dev, "BLK="); |
| 123 | for (i = 0; i < I2C_SMBUS_BLOCK_MAX / 2; i++) |
| 124 | printk("%02x,", inb_p(SMBBLKDAT)); |
| 125 | printk("\n"); |
| 126 | dev_dbg(&vt596_adapter.dev, " "); |
| 127 | for (; i < I2C_SMBUS_BLOCK_MAX - 1; i++) |
| 128 | printk("%02x,", inb_p(SMBBLKDAT)); |
| 129 | printk("%02x\n", inb_p(SMBBLKDAT)); |
| 130 | } |
| 131 | } |
Greg KH | ca68f11 | 2005-09-22 22:23:32 +0200 | [diff] [blame] | 132 | #else |
| 133 | static inline void vt596_dump_regs(const char *msg, u8 size) { } |
Jean Delvare | ed5453e | 2005-09-22 22:23:32 +0200 | [diff] [blame] | 134 | #endif |
| 135 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 136 | /* Return -1 on error, 0 on success */ |
Jean Delvare | 50c1cc3 | 2005-09-22 22:15:53 +0200 | [diff] [blame] | 137 | static int vt596_transaction(u8 size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | { |
| 139 | int temp; |
| 140 | int result = 0; |
| 141 | int timeout = 0; |
| 142 | |
Jean Delvare | ed5453e | 2005-09-22 22:23:32 +0200 | [diff] [blame] | 143 | vt596_dump_regs("Transaction (pre)", size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
| 145 | /* Make sure the SMBus host is ready to start transmitting */ |
| 146 | if ((temp = inb_p(SMBHSTSTS)) & 0x1F) { |
| 147 | dev_dbg(&vt596_adapter.dev, "SMBus busy (0x%02x). " |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 148 | "Resetting...\n", temp); |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 149 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | outb_p(temp, SMBHSTSTS); |
| 151 | if ((temp = inb_p(SMBHSTSTS)) & 0x1F) { |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 152 | dev_err(&vt596_adapter.dev, "SMBus reset failed! " |
| 153 | "(0x%02x)\n", temp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | } |
| 156 | } |
| 157 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 158 | /* Start the transaction by setting bit 6 */ |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 159 | outb_p(0x40 | size, SMBHSTCNT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 161 | /* We will always wait for a fraction of a second */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | do { |
| 163 | msleep(1); |
| 164 | temp = inb_p(SMBHSTSTS); |
| 165 | } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT)); |
| 166 | |
| 167 | /* If the SMBus is still busy, we give up */ |
| 168 | if (timeout >= MAX_TIMEOUT) { |
| 169 | result = -1; |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 170 | dev_err(&vt596_adapter.dev, "SMBus timeout!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | if (temp & 0x10) { |
| 174 | result = -1; |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 175 | dev_err(&vt596_adapter.dev, "Transaction failed (0x%02x)\n", |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 176 | size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | } |
| 178 | |
| 179 | if (temp & 0x08) { |
| 180 | result = -1; |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 181 | dev_err(&vt596_adapter.dev, "SMBus collision!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | if (temp & 0x04) { |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 185 | int read = inb_p(SMBHSTADD) & 0x01; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | result = -1; |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 187 | /* The quick and receive byte commands are used to probe |
| 188 | for chips, so errors are expected, and we don't want |
| 189 | to frighten the user. */ |
| 190 | if (!((size == VT596_QUICK && !read) || |
| 191 | (size == VT596_BYTE && read))) |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 192 | dev_err(&vt596_adapter.dev, "Transaction error!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | } |
| 194 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 195 | /* Resetting status register */ |
| 196 | if (temp & 0x1F) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | outb_p(temp, SMBHSTSTS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Jean Delvare | ed5453e | 2005-09-22 22:23:32 +0200 | [diff] [blame] | 199 | vt596_dump_regs("Transaction (post)", size); |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | return result; |
| 202 | } |
| 203 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 204 | /* Return -1 on error, 0 on success */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | static s32 vt596_access(struct i2c_adapter *adap, u16 addr, |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 206 | unsigned short flags, char read_write, u8 command, |
| 207 | int size, union i2c_smbus_data *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | { |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 209 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
| 211 | switch (size) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | case I2C_SMBUS_QUICK: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | size = VT596_QUICK; |
| 214 | break; |
| 215 | case I2C_SMBUS_BYTE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | if (read_write == I2C_SMBUS_WRITE) |
| 217 | outb_p(command, SMBHSTCMD); |
| 218 | size = VT596_BYTE; |
| 219 | break; |
| 220 | case I2C_SMBUS_BYTE_DATA: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | outb_p(command, SMBHSTCMD); |
| 222 | if (read_write == I2C_SMBUS_WRITE) |
| 223 | outb_p(data->byte, SMBHSTDAT0); |
| 224 | size = VT596_BYTE_DATA; |
| 225 | break; |
| 226 | case I2C_SMBUS_WORD_DATA: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | outb_p(command, SMBHSTCMD); |
| 228 | if (read_write == I2C_SMBUS_WRITE) { |
| 229 | outb_p(data->word & 0xff, SMBHSTDAT0); |
| 230 | outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); |
| 231 | } |
| 232 | size = VT596_WORD_DATA; |
| 233 | break; |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 234 | case I2C_SMBUS_I2C_BLOCK_DATA: |
| 235 | if (!(vt596_features & FEATURE_I2CBLOCK)) |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 236 | goto exit_unsupported; |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 237 | if (read_write == I2C_SMBUS_READ) |
| 238 | outb_p(I2C_SMBUS_BLOCK_MAX, SMBHSTDAT0); |
| 239 | /* Fall through */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | case I2C_SMBUS_BLOCK_DATA: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | outb_p(command, SMBHSTCMD); |
| 242 | if (read_write == I2C_SMBUS_WRITE) { |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 243 | u8 len = data->block[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | if (len > I2C_SMBUS_BLOCK_MAX) |
| 245 | len = I2C_SMBUS_BLOCK_MAX; |
| 246 | outb_p(len, SMBHSTDAT0); |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 247 | inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | for (i = 1; i <= len; i++) |
| 249 | outb_p(data->block[i], SMBBLKDAT); |
| 250 | } |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 251 | size = (size == I2C_SMBUS_I2C_BLOCK_DATA) ? |
| 252 | VT596_I2C_BLOCK_DATA : VT596_BLOCK_DATA; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | break; |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 254 | default: |
| 255 | goto exit_unsupported; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | } |
| 257 | |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 258 | outb_p(((addr & 0x7f) << 1) | read_write, SMBHSTADD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
Jean Delvare | 50c1cc3 | 2005-09-22 22:15:53 +0200 | [diff] [blame] | 260 | if (vt596_transaction(size)) /* Error in transaction */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | return -1; |
| 262 | |
| 263 | if ((read_write == I2C_SMBUS_WRITE) || (size == VT596_QUICK)) |
| 264 | return 0; |
| 265 | |
| 266 | switch (size) { |
| 267 | case VT596_BYTE: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | case VT596_BYTE_DATA: |
| 269 | data->byte = inb_p(SMBHSTDAT0); |
| 270 | break; |
| 271 | case VT596_WORD_DATA: |
| 272 | data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); |
| 273 | break; |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 274 | case VT596_I2C_BLOCK_DATA: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | case VT596_BLOCK_DATA: |
| 276 | data->block[0] = inb_p(SMBHSTDAT0); |
| 277 | if (data->block[0] > I2C_SMBUS_BLOCK_MAX) |
| 278 | data->block[0] = I2C_SMBUS_BLOCK_MAX; |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 279 | inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | for (i = 1; i <= data->block[0]; i++) |
| 281 | data->block[i] = inb_p(SMBBLKDAT); |
| 282 | break; |
| 283 | } |
| 284 | return 0; |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 285 | |
| 286 | exit_unsupported: |
| 287 | dev_warn(&vt596_adapter.dev, "Unsupported command invoked! (0x%02x)\n", |
| 288 | size); |
| 289 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | static u32 vt596_func(struct i2c_adapter *adapter) |
| 293 | { |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 294 | u32 func = I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | |
| 296 | I2C_FUNC_SMBUS_BLOCK_DATA; |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 297 | |
| 298 | if (vt596_features & FEATURE_I2CBLOCK) |
| 299 | func |= I2C_FUNC_SMBUS_I2C_BLOCK; |
| 300 | return func; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | } |
| 302 | |
Jean Delvare | 8f9082c | 2006-09-03 22:39:46 +0200 | [diff] [blame] | 303 | static const struct i2c_algorithm smbus_algorithm = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | .smbus_xfer = vt596_access, |
| 305 | .functionality = vt596_func, |
| 306 | }; |
| 307 | |
| 308 | static struct i2c_adapter vt596_adapter = { |
| 309 | .owner = THIS_MODULE, |
Stephen Hemminger | 9ace555 | 2007-02-13 22:09:01 +0100 | [diff] [blame] | 310 | .id = I2C_HW_SMBUS_VIA2, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | .class = I2C_CLASS_HWMON, |
| 312 | .algo = &smbus_algorithm, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | }; |
| 314 | |
| 315 | static int __devinit vt596_probe(struct pci_dev *pdev, |
| 316 | const struct pci_device_id *id) |
| 317 | { |
| 318 | unsigned char temp; |
| 319 | int error = -ENODEV; |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | /* Determine the address of the SMBus areas */ |
| 322 | if (force_addr) { |
| 323 | vt596_smba = force_addr & 0xfff0; |
| 324 | force = 0; |
| 325 | goto found; |
| 326 | } |
| 327 | |
| 328 | if ((pci_read_config_word(pdev, id->driver_data, &vt596_smba)) || |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 329 | !(vt596_smba & 0x0001)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | /* try 2nd address and config reg. for 596 */ |
| 331 | if (id->device == PCI_DEVICE_ID_VIA_82C596_3 && |
| 332 | !pci_read_config_word(pdev, SMBBA2, &vt596_smba) && |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 333 | (vt596_smba & 0x0001)) { |
| 334 | SMBHSTCFG = 0x84; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } else { |
| 336 | /* no matches at all */ |
| 337 | dev_err(&pdev->dev, "Cannot configure " |
| 338 | "SMBus I/O Base address\n"); |
| 339 | return -ENODEV; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | vt596_smba &= 0xfff0; |
| 344 | if (vt596_smba == 0) { |
| 345 | dev_err(&pdev->dev, "SMBus base address " |
| 346 | "uninitialized - upgrade BIOS or use " |
| 347 | "force_addr=0xaddr\n"); |
| 348 | return -ENODEV; |
| 349 | } |
| 350 | |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 351 | found: |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 352 | if (!request_region(vt596_smba, 8, vt596_driver.name)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | dev_err(&pdev->dev, "SMBus region 0x%x already in use!\n", |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 354 | vt596_smba); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | return -ENODEV; |
| 356 | } |
| 357 | |
| 358 | pci_read_config_byte(pdev, SMBHSTCFG, &temp); |
| 359 | /* If force_addr is set, we program the new address here. Just to make |
| 360 | sure, we disable the VT596 first. */ |
| 361 | if (force_addr) { |
| 362 | pci_write_config_byte(pdev, SMBHSTCFG, temp & 0xfe); |
| 363 | pci_write_config_word(pdev, id->driver_data, vt596_smba); |
| 364 | pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01); |
| 365 | dev_warn(&pdev->dev, "WARNING: SMBus interface set to new " |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 366 | "address 0x%04x!\n", vt596_smba); |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 367 | } else if (!(temp & 0x01)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | if (force) { |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 369 | /* NOTE: This assumes I/O space and other allocations |
| 370 | * WERE done by the Bios! Don't complain if your |
| 371 | * hardware does weird things after enabling this. |
| 372 | * :') Check for Bios updates before resorting to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | * this. |
| 374 | */ |
Jean Delvare | c2f559d | 2005-09-22 22:01:07 +0200 | [diff] [blame] | 375 | pci_write_config_byte(pdev, SMBHSTCFG, temp | 0x01); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | dev_info(&pdev->dev, "Enabling SMBus device\n"); |
| 377 | } else { |
| 378 | dev_err(&pdev->dev, "SMBUS: Error: Host SMBus " |
| 379 | "controller not enabled! - upgrade BIOS or " |
| 380 | "use force=1\n"); |
| 381 | goto release_region; |
| 382 | } |
| 383 | } |
| 384 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | dev_dbg(&pdev->dev, "VT596_smba = 0x%X\n", vt596_smba); |
| 386 | |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 387 | switch (pdev->device) { |
Jean Delvare | ab6a6ed | 2007-02-13 22:09:02 +0100 | [diff] [blame] | 388 | case PCI_DEVICE_ID_VIA_CX700: |
Rudolf Marek | c243353 | 2006-09-03 22:35:21 +0200 | [diff] [blame] | 389 | case PCI_DEVICE_ID_VIA_8251: |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 390 | case PCI_DEVICE_ID_VIA_8237: |
Rudolf Marek | c243353 | 2006-09-03 22:35:21 +0200 | [diff] [blame] | 391 | case PCI_DEVICE_ID_VIA_8237A: |
Jean Delvare | f118301 | 2005-09-22 21:58:41 +0200 | [diff] [blame] | 392 | case PCI_DEVICE_ID_VIA_8235: |
| 393 | case PCI_DEVICE_ID_VIA_8233A: |
| 394 | case PCI_DEVICE_ID_VIA_8233_0: |
| 395 | vt596_features |= FEATURE_I2CBLOCK; |
| 396 | break; |
| 397 | case PCI_DEVICE_ID_VIA_82C686_4: |
| 398 | /* The VT82C686B (rev 0x40) does support I2C block |
| 399 | transactions, but the VT82C686A (rev 0x30) doesn't */ |
| 400 | if (!pci_read_config_byte(pdev, PCI_REVISION_ID, &temp) |
| 401 | && temp >= 0x40) |
| 402 | vt596_features |= FEATURE_I2CBLOCK; |
| 403 | break; |
| 404 | } |
| 405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | vt596_adapter.dev.parent = &pdev->dev; |
| 407 | snprintf(vt596_adapter.name, I2C_NAME_SIZE, |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 408 | "SMBus Via Pro adapter at %04x", vt596_smba); |
| 409 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | vt596_pdev = pci_dev_get(pdev); |
| 411 | if (i2c_add_adapter(&vt596_adapter)) { |
| 412 | pci_dev_put(vt596_pdev); |
| 413 | vt596_pdev = NULL; |
| 414 | } |
| 415 | |
| 416 | /* Always return failure here. This is to allow other drivers to bind |
| 417 | * to this pci device. We don't really want to have control over the |
| 418 | * pci device, we only wanted to read as few register values from it. |
| 419 | */ |
| 420 | return -ENODEV; |
| 421 | |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 422 | release_region: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | release_region(vt596_smba, 8); |
| 424 | return error; |
| 425 | } |
| 426 | |
| 427 | static struct pci_device_id vt596_ids[] = { |
| 428 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596_3), |
| 429 | .driver_data = SMBBA1 }, |
| 430 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C596B_3), |
| 431 | .driver_data = SMBBA1 }, |
| 432 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C686_4), |
| 433 | .driver_data = SMBBA1 }, |
| 434 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233_0), |
| 435 | .driver_data = SMBBA3 }, |
| 436 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8233A), |
| 437 | .driver_data = SMBBA3 }, |
| 438 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8235), |
| 439 | .driver_data = SMBBA3 }, |
| 440 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237), |
| 441 | .driver_data = SMBBA3 }, |
Rudolf Marek | c243353 | 2006-09-03 22:35:21 +0200 | [diff] [blame] | 442 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8237A), |
| 443 | .driver_data = SMBBA3 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4), |
| 445 | .driver_data = SMBBA1 }, |
Rudolf Marek | c243353 | 2006-09-03 22:35:21 +0200 | [diff] [blame] | 446 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8251), |
| 447 | .driver_data = SMBBA3 }, |
Jean Delvare | ab6a6ed | 2007-02-13 22:09:02 +0100 | [diff] [blame] | 448 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_CX700), |
| 449 | .driver_data = SMBBA3 }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { 0, } |
| 451 | }; |
| 452 | |
Jean Delvare | 5f49ef8 | 2005-09-22 21:50:47 +0200 | [diff] [blame] | 453 | MODULE_DEVICE_TABLE(pci, vt596_ids); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
| 455 | static struct pci_driver vt596_driver = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | .name = "vt596_smbus", |
| 457 | .id_table = vt596_ids, |
| 458 | .probe = vt596_probe, |
| 459 | }; |
| 460 | |
| 461 | static int __init i2c_vt596_init(void) |
| 462 | { |
| 463 | return pci_register_driver(&vt596_driver); |
| 464 | } |
| 465 | |
| 466 | |
| 467 | static void __exit i2c_vt596_exit(void) |
| 468 | { |
| 469 | pci_unregister_driver(&vt596_driver); |
| 470 | if (vt596_pdev != NULL) { |
| 471 | i2c_del_adapter(&vt596_adapter); |
| 472 | release_region(vt596_smba, 8); |
| 473 | pci_dev_put(vt596_pdev); |
| 474 | vt596_pdev = NULL; |
| 475 | } |
| 476 | } |
| 477 | |
Jean Delvare | 8750197 | 2005-10-31 18:51:21 +0100 | [diff] [blame] | 478 | MODULE_AUTHOR("Kyosti Malkki <kmalkki@cc.hut.fi>, " |
| 479 | "Mark D. Studebaker <mdsxyz123@yahoo.com> and " |
| 480 | "Jean Delvare <khali@linux-fr.org>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | MODULE_DESCRIPTION("vt82c596 SMBus driver"); |
| 482 | MODULE_LICENSE("GPL"); |
| 483 | |
| 484 | module_init(i2c_vt596_init); |
| 485 | module_exit(i2c_vt596_exit); |