1 /* 2 amd756.c - Part of lm_sensors, Linux kernel modules for hardware 3 monitoring 4 5 Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org> 6 7 Shamelessly ripped from i2c-piix4.c: 8 9 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and 10 Philip Edelbrock <phil@netroedge.com> 11 12 This program is free software; you can redistribute it and/or modify 13 it under the terms of the GNU General Public License as published by 14 the Free Software Foundation; either version 2 of the License, or 15 (at your option) any later version. 16 17 This program is distributed in the hope that it will be useful, 18 but WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 GNU General Public License for more details. 21 22 You should have received a copy of the GNU General Public License 23 along with this program; if not, write to the Free Software 24 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 25 */ 26 27 /* 28 2002-04-08: Added nForce support. (Csaba Halasz) 29 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil) 30 2002-12-28: Rewritten into something that resembles a Linux driver (hch) 31 2003-11-29: Added back AMD8111 removed by the previous rewrite. 32 (Philip Pokorny) 33 */ 34 35 /* 36 Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce 37 Note: we assume there can only be one device, with one SMBus interface. 38 */ 39 40 #include <linux/module.h> 41 #include <linux/pci.h> 42 #include <linux/kernel.h> 43 #include <linux/delay.h> 44 #include <linux/stddef.h> 45 #include <linux/sched.h> 46 #include <linux/ioport.h> 47 #include <linux/i2c.h> 48 #include <linux/init.h> 49 #include <asm/io.h> 50 51 /* AMD756 SMBus address offsets */ 52 #define SMB_ADDR_OFFSET 0xE0 53 #define SMB_IOSIZE 16 54 #define SMB_GLOBAL_STATUS (0x0 + amd756_ioport) 55 #define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport) 56 #define SMB_HOST_ADDRESS (0x4 + amd756_ioport) 57 #define SMB_HOST_DATA (0x6 + amd756_ioport) 58 #define SMB_HOST_COMMAND (0x8 + amd756_ioport) 59 #define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport) 60 #define SMB_HAS_DATA (0xA + amd756_ioport) 61 #define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport) 62 #define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport) 63 #define SMB_SNOOP_ADDRESS (0xF + amd756_ioport) 64 65 /* PCI Address Constants */ 66 67 /* address of I/O space */ 68 #define SMBBA 0x058 /* mh */ 69 #define SMBBANFORCE 0x014 70 71 /* general configuration */ 72 #define SMBGCFG 0x041 /* mh */ 73 74 /* silicon revision code */ 75 #define SMBREV 0x008 76 77 /* Other settings */ 78 #define MAX_TIMEOUT 500 79 80 /* AMD756 constants */ 81 #define AMD756_QUICK 0x00 82 #define AMD756_BYTE 0x01 83 #define AMD756_BYTE_DATA 0x02 84 #define AMD756_WORD_DATA 0x03 85 #define AMD756_PROCESS_CALL 0x04 86 #define AMD756_BLOCK_DATA 0x05 87 88 static struct pci_driver amd756_driver; 89 static unsigned short amd756_ioport; 90 91 /* 92 SMBUS event = I/O 28-29 bit 11 93 see E0 for the status bits and enabled in E2 94 95 */ 96 #define GS_ABRT_STS (1 << 0) 97 #define GS_COL_STS (1 << 1) 98 #define GS_PRERR_STS (1 << 2) 99 #define GS_HST_STS (1 << 3) 100 #define GS_HCYC_STS (1 << 4) 101 #define GS_TO_STS (1 << 5) 102 #define GS_SMB_STS (1 << 11) 103 104 #define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \ 105 GS_HCYC_STS | GS_TO_STS ) 106 107 #define GE_CYC_TYPE_MASK (7) 108 #define GE_HOST_STC (1 << 3) 109 #define GE_ABORT (1 << 5) 110 111 112 static int amd756_transaction(struct i2c_adapter *adap) 113 { 114 int temp; 115 int result = 0; 116 int timeout = 0; 117 118 dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, " 119 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS), 120 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS), 121 inb_p(SMB_HOST_DATA)); 122 123 /* Make sure the SMBus host is ready to start transmitting */ 124 if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) { 125 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp); 126 do { 127 msleep(1); 128 temp = inw_p(SMB_GLOBAL_STATUS); 129 } while ((temp & (GS_HST_STS | GS_SMB_STS)) && 130 (timeout++ < MAX_TIMEOUT)); 131 /* If the SMBus is still busy, we give up */ 132 if (timeout >= MAX_TIMEOUT) { 133 dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp); 134 goto abort; 135 } 136 timeout = 0; 137 } 138 139 /* start the transaction by setting the start bit */ 140 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE); 141 142 /* We will always wait for a fraction of a second! */ 143 do { 144 msleep(1); 145 temp = inw_p(SMB_GLOBAL_STATUS); 146 } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT)); 147 148 /* If the SMBus is still busy, we give up */ 149 if (timeout >= MAX_TIMEOUT) { 150 dev_dbg(&adap->dev, "Completion timeout!\n"); 151 goto abort; 152 } 153 154 if (temp & GS_PRERR_STS) { 155 result = -1; 156 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n"); 157 } 158 159 if (temp & GS_COL_STS) { 160 result = -1; 161 dev_warn(&adap->dev, "SMBus collision!\n"); 162 } 163 164 if (temp & GS_TO_STS) { 165 result = -1; 166 dev_dbg(&adap->dev, "SMBus protocol timeout!\n"); 167 } 168 169 if (temp & GS_HCYC_STS) 170 dev_dbg(&adap->dev, "SMBus protocol success!\n"); 171 172 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); 173 174 #ifdef DEBUG 175 if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) { 176 dev_dbg(&adap->dev, 177 "Failed reset at end of transaction (%04x)\n", temp); 178 } 179 #endif 180 181 dev_dbg(&adap->dev, 182 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n", 183 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), 184 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); 185 186 return result; 187 188 abort: 189 dev_warn(&adap->dev, "Sending abort\n"); 190 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE); 191 msleep(100); 192 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); 193 return -1; 194 } 195 196 /* Return -1 on error. */ 197 static s32 amd756_access(struct i2c_adapter * adap, u16 addr, 198 unsigned short flags, char read_write, 199 u8 command, int size, union i2c_smbus_data * data) 200 { 201 int i, len; 202 203 /** TODO: Should I supporte the 10-bit transfers? */ 204 switch (size) { 205 case I2C_SMBUS_PROC_CALL: 206 dev_dbg(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n"); 207 /* TODO: Well... It is supported, I'm just not sure what to do here... */ 208 return -1; 209 case I2C_SMBUS_QUICK: 210 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 211 SMB_HOST_ADDRESS); 212 size = AMD756_QUICK; 213 break; 214 case I2C_SMBUS_BYTE: 215 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 216 SMB_HOST_ADDRESS); 217 if (read_write == I2C_SMBUS_WRITE) 218 outb_p(command, SMB_HOST_DATA); 219 size = AMD756_BYTE; 220 break; 221 case I2C_SMBUS_BYTE_DATA: 222 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 223 SMB_HOST_ADDRESS); 224 outb_p(command, SMB_HOST_COMMAND); 225 if (read_write == I2C_SMBUS_WRITE) 226 outw_p(data->byte, SMB_HOST_DATA); 227 size = AMD756_BYTE_DATA; 228 break; 229 case I2C_SMBUS_WORD_DATA: 230 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 231 SMB_HOST_ADDRESS); 232 outb_p(command, SMB_HOST_COMMAND); 233 if (read_write == I2C_SMBUS_WRITE) 234 outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */ 235 size = AMD756_WORD_DATA; 236 break; 237 case I2C_SMBUS_BLOCK_DATA: 238 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 239 SMB_HOST_ADDRESS); 240 outb_p(command, SMB_HOST_COMMAND); 241 if (read_write == I2C_SMBUS_WRITE) { 242 len = data->block[0]; 243 if (len < 0) 244 len = 0; 245 if (len > 32) 246 len = 32; 247 outw_p(len, SMB_HOST_DATA); 248 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ 249 for (i = 1; i <= len; i++) 250 outb_p(data->block[i], 251 SMB_HOST_BLOCK_DATA); 252 } 253 size = AMD756_BLOCK_DATA; 254 break; 255 } 256 257 /* How about enabling interrupts... */ 258 outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE); 259 260 if (amd756_transaction(adap)) /* Error in transaction */ 261 return -1; 262 263 if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK)) 264 return 0; 265 266 267 switch (size) { 268 case AMD756_BYTE: 269 data->byte = inw_p(SMB_HOST_DATA); 270 break; 271 case AMD756_BYTE_DATA: 272 data->byte = inw_p(SMB_HOST_DATA); 273 break; 274 case AMD756_WORD_DATA: 275 data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */ 276 break; 277 case AMD756_BLOCK_DATA: 278 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f; 279 if(data->block[0] > 32) 280 data->block[0] = 32; 281 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ 282 for (i = 1; i <= data->block[0]; i++) 283 data->block[i] = inb_p(SMB_HOST_BLOCK_DATA); 284 break; 285 } 286 287 return 0; 288 } 289 290 static u32 amd756_func(struct i2c_adapter *adapter) 291 { 292 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 293 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | 294 I2C_FUNC_SMBUS_BLOCK_DATA | I2C_FUNC_SMBUS_PROC_CALL; 295 } 296 297 static struct i2c_algorithm smbus_algorithm = { 298 .smbus_xfer = amd756_access, 299 .functionality = amd756_func, 300 }; 301 302 struct i2c_adapter amd756_smbus = { 303 .owner = THIS_MODULE, 304 .class = I2C_CLASS_HWMON, 305 .algo = &smbus_algorithm, 306 }; 307 308 enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 }; 309 static const char* chipname[] = { 310 "AMD756", "AMD766", "AMD768", 311 "nVidia nForce", "AMD8111", 312 }; 313 314 static struct pci_device_id amd756_ids[] = { 315 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B), 316 .driver_data = AMD756 }, 317 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413), 318 .driver_data = AMD766 }, 319 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443), 320 .driver_data = AMD768 }, 321 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), 322 .driver_data = AMD8111 }, 323 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS), 324 .driver_data = NFORCE }, 325 { 0, } 326 }; 327 328 MODULE_DEVICE_TABLE (pci, amd756_ids); 329 330 static int __devinit amd756_probe(struct pci_dev *pdev, 331 const struct pci_device_id *id) 332 { 333 int nforce = (id->driver_data == NFORCE); 334 int error; 335 u8 temp; 336 337 if (amd756_ioport) { 338 dev_err(&pdev->dev, "Only one device supported " 339 "(you have a strange motherboard, btw)\n"); 340 return -ENODEV; 341 } 342 343 if (nforce) { 344 if (PCI_FUNC(pdev->devfn) != 1) 345 return -ENODEV; 346 347 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport); 348 amd756_ioport &= 0xfffc; 349 } else { /* amd */ 350 if (PCI_FUNC(pdev->devfn) != 3) 351 return -ENODEV; 352 353 pci_read_config_byte(pdev, SMBGCFG, &temp); 354 if ((temp & 128) == 0) { 355 dev_err(&pdev->dev, 356 "Error: SMBus controller I/O not enabled!\n"); 357 return -ENODEV; 358 } 359 360 /* Determine the address of the SMBus areas */ 361 /* Technically it is a dword but... */ 362 pci_read_config_word(pdev, SMBBA, &amd756_ioport); 363 amd756_ioport &= 0xff00; 364 amd756_ioport += SMB_ADDR_OFFSET; 365 } 366 367 if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) { 368 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n", 369 amd756_ioport); 370 return -ENODEV; 371 } 372 373 pci_read_config_byte(pdev, SMBREV, &temp); 374 dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp); 375 dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport); 376 377 /* set up the driverfs linkage to our parent device */ 378 amd756_smbus.dev.parent = &pdev->dev; 379 380 sprintf(amd756_smbus.name, "SMBus %s adapter at %04x", 381 chipname[id->driver_data], amd756_ioport); 382 383 error = i2c_add_adapter(&amd756_smbus); 384 if (error) { 385 dev_err(&pdev->dev, 386 "Adapter registration failed, module not inserted\n"); 387 goto out_err; 388 } 389 390 return 0; 391 392 out_err: 393 release_region(amd756_ioport, SMB_IOSIZE); 394 return error; 395 } 396 397 static void __devexit amd756_remove(struct pci_dev *dev) 398 { 399 i2c_del_adapter(&amd756_smbus); 400 release_region(amd756_ioport, SMB_IOSIZE); 401 } 402 403 static struct pci_driver amd756_driver = { 404 .name = "amd756_smbus", 405 .id_table = amd756_ids, 406 .probe = amd756_probe, 407 .remove = __devexit_p(amd756_remove), 408 }; 409 410 static int __init amd756_init(void) 411 { 412 return pci_register_driver(&amd756_driver); 413 } 414 415 static void __exit amd756_exit(void) 416 { 417 pci_unregister_driver(&amd756_driver); 418 } 419 420 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>"); 421 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver"); 422 MODULE_LICENSE("GPL"); 423 424 EXPORT_SYMBOL(amd756_smbus); 425 426 module_init(amd756_init) 427 module_exit(amd756_exit) 428