1 /* 2 Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org> 3 4 Shamelessly ripped from i2c-piix4.c: 5 6 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and 7 Philip Edelbrock <phil@netroedge.com> 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 /* 25 2002-04-08: Added nForce support. (Csaba Halasz) 26 2002-10-03: Fixed nForce PnP I/O port. (Michael Steil) 27 2002-12-28: Rewritten into something that resembles a Linux driver (hch) 28 2003-11-29: Added back AMD8111 removed by the previous rewrite. 29 (Philip Pokorny) 30 */ 31 32 /* 33 Supports AMD756, AMD766, AMD768, AMD8111 and nVidia nForce 34 Note: we assume there can only be one device, with one SMBus interface. 35 */ 36 37 #include <linux/module.h> 38 #include <linux/pci.h> 39 #include <linux/kernel.h> 40 #include <linux/delay.h> 41 #include <linux/stddef.h> 42 #include <linux/ioport.h> 43 #include <linux/i2c.h> 44 #include <linux/init.h> 45 #include <linux/acpi.h> 46 #include <asm/io.h> 47 48 /* AMD756 SMBus address offsets */ 49 #define SMB_ADDR_OFFSET 0xE0 50 #define SMB_IOSIZE 16 51 #define SMB_GLOBAL_STATUS (0x0 + amd756_ioport) 52 #define SMB_GLOBAL_ENABLE (0x2 + amd756_ioport) 53 #define SMB_HOST_ADDRESS (0x4 + amd756_ioport) 54 #define SMB_HOST_DATA (0x6 + amd756_ioport) 55 #define SMB_HOST_COMMAND (0x8 + amd756_ioport) 56 #define SMB_HOST_BLOCK_DATA (0x9 + amd756_ioport) 57 #define SMB_HAS_DATA (0xA + amd756_ioport) 58 #define SMB_HAS_DEVICE_ADDRESS (0xC + amd756_ioport) 59 #define SMB_HAS_HOST_ADDRESS (0xE + amd756_ioport) 60 #define SMB_SNOOP_ADDRESS (0xF + amd756_ioport) 61 62 /* PCI Address Constants */ 63 64 /* address of I/O space */ 65 #define SMBBA 0x058 /* mh */ 66 #define SMBBANFORCE 0x014 67 68 /* general configuration */ 69 #define SMBGCFG 0x041 /* mh */ 70 71 /* silicon revision code */ 72 #define SMBREV 0x008 73 74 /* Other settings */ 75 #define MAX_TIMEOUT 500 76 77 /* AMD756 constants */ 78 #define AMD756_QUICK 0x00 79 #define AMD756_BYTE 0x01 80 #define AMD756_BYTE_DATA 0x02 81 #define AMD756_WORD_DATA 0x03 82 #define AMD756_PROCESS_CALL 0x04 83 #define AMD756_BLOCK_DATA 0x05 84 85 static struct pci_driver amd756_driver; 86 static unsigned short amd756_ioport; 87 88 /* 89 SMBUS event = I/O 28-29 bit 11 90 see E0 for the status bits and enabled in E2 91 92 */ 93 #define GS_ABRT_STS (1 << 0) 94 #define GS_COL_STS (1 << 1) 95 #define GS_PRERR_STS (1 << 2) 96 #define GS_HST_STS (1 << 3) 97 #define GS_HCYC_STS (1 << 4) 98 #define GS_TO_STS (1 << 5) 99 #define GS_SMB_STS (1 << 11) 100 101 #define GS_CLEAR_STS (GS_ABRT_STS | GS_COL_STS | GS_PRERR_STS | \ 102 GS_HCYC_STS | GS_TO_STS ) 103 104 #define GE_CYC_TYPE_MASK (7) 105 #define GE_HOST_STC (1 << 3) 106 #define GE_ABORT (1 << 5) 107 108 109 static int amd756_transaction(struct i2c_adapter *adap) 110 { 111 int temp; 112 int result = 0; 113 int timeout = 0; 114 115 dev_dbg(&adap->dev, "Transaction (pre): GS=%04x, GE=%04x, ADD=%04x, " 116 "DAT=%04x\n", inw_p(SMB_GLOBAL_STATUS), 117 inw_p(SMB_GLOBAL_ENABLE), inw_p(SMB_HOST_ADDRESS), 118 inb_p(SMB_HOST_DATA)); 119 120 /* Make sure the SMBus host is ready to start transmitting */ 121 if ((temp = inw_p(SMB_GLOBAL_STATUS)) & (GS_HST_STS | GS_SMB_STS)) { 122 dev_dbg(&adap->dev, "SMBus busy (%04x). Waiting...\n", temp); 123 do { 124 msleep(1); 125 temp = inw_p(SMB_GLOBAL_STATUS); 126 } while ((temp & (GS_HST_STS | GS_SMB_STS)) && 127 (timeout++ < MAX_TIMEOUT)); 128 /* If the SMBus is still busy, we give up */ 129 if (timeout > MAX_TIMEOUT) { 130 dev_dbg(&adap->dev, "Busy wait timeout (%04x)\n", temp); 131 goto abort; 132 } 133 timeout = 0; 134 } 135 136 /* start the transaction by setting the start bit */ 137 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_HOST_STC, SMB_GLOBAL_ENABLE); 138 139 /* We will always wait for a fraction of a second! */ 140 do { 141 msleep(1); 142 temp = inw_p(SMB_GLOBAL_STATUS); 143 } while ((temp & GS_HST_STS) && (timeout++ < MAX_TIMEOUT)); 144 145 /* If the SMBus is still busy, we give up */ 146 if (timeout > MAX_TIMEOUT) { 147 dev_dbg(&adap->dev, "Completion timeout!\n"); 148 goto abort; 149 } 150 151 if (temp & GS_PRERR_STS) { 152 result = -ENXIO; 153 dev_dbg(&adap->dev, "SMBus Protocol error (no response)!\n"); 154 } 155 156 if (temp & GS_COL_STS) { 157 result = -EIO; 158 dev_warn(&adap->dev, "SMBus collision!\n"); 159 } 160 161 if (temp & GS_TO_STS) { 162 result = -ETIMEDOUT; 163 dev_dbg(&adap->dev, "SMBus protocol timeout!\n"); 164 } 165 166 if (temp & GS_HCYC_STS) 167 dev_dbg(&adap->dev, "SMBus protocol success!\n"); 168 169 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); 170 171 #ifdef DEBUG 172 if (((temp = inw_p(SMB_GLOBAL_STATUS)) & GS_CLEAR_STS) != 0x00) { 173 dev_dbg(&adap->dev, 174 "Failed reset at end of transaction (%04x)\n", temp); 175 } 176 #endif 177 178 dev_dbg(&adap->dev, 179 "Transaction (post): GS=%04x, GE=%04x, ADD=%04x, DAT=%04x\n", 180 inw_p(SMB_GLOBAL_STATUS), inw_p(SMB_GLOBAL_ENABLE), 181 inw_p(SMB_HOST_ADDRESS), inb_p(SMB_HOST_DATA)); 182 183 return result; 184 185 abort: 186 dev_warn(&adap->dev, "Sending abort\n"); 187 outw_p(inw(SMB_GLOBAL_ENABLE) | GE_ABORT, SMB_GLOBAL_ENABLE); 188 msleep(100); 189 outw_p(GS_CLEAR_STS, SMB_GLOBAL_STATUS); 190 return -EIO; 191 } 192 193 /* Return negative errno on error. */ 194 static s32 amd756_access(struct i2c_adapter * adap, u16 addr, 195 unsigned short flags, char read_write, 196 u8 command, int size, union i2c_smbus_data * data) 197 { 198 int i, len; 199 int status; 200 201 switch (size) { 202 case I2C_SMBUS_QUICK: 203 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 204 SMB_HOST_ADDRESS); 205 size = AMD756_QUICK; 206 break; 207 case I2C_SMBUS_BYTE: 208 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 209 SMB_HOST_ADDRESS); 210 if (read_write == I2C_SMBUS_WRITE) 211 outb_p(command, SMB_HOST_DATA); 212 size = AMD756_BYTE; 213 break; 214 case I2C_SMBUS_BYTE_DATA: 215 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 216 SMB_HOST_ADDRESS); 217 outb_p(command, SMB_HOST_COMMAND); 218 if (read_write == I2C_SMBUS_WRITE) 219 outw_p(data->byte, SMB_HOST_DATA); 220 size = AMD756_BYTE_DATA; 221 break; 222 case I2C_SMBUS_WORD_DATA: 223 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 224 SMB_HOST_ADDRESS); 225 outb_p(command, SMB_HOST_COMMAND); 226 if (read_write == I2C_SMBUS_WRITE) 227 outw_p(data->word, SMB_HOST_DATA); /* TODO: endian???? */ 228 size = AMD756_WORD_DATA; 229 break; 230 case I2C_SMBUS_BLOCK_DATA: 231 outw_p(((addr & 0x7f) << 1) | (read_write & 0x01), 232 SMB_HOST_ADDRESS); 233 outb_p(command, SMB_HOST_COMMAND); 234 if (read_write == I2C_SMBUS_WRITE) { 235 len = data->block[0]; 236 if (len < 0) 237 len = 0; 238 if (len > 32) 239 len = 32; 240 outw_p(len, SMB_HOST_DATA); 241 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ 242 for (i = 1; i <= len; i++) 243 outb_p(data->block[i], 244 SMB_HOST_BLOCK_DATA); 245 } 246 size = AMD756_BLOCK_DATA; 247 break; 248 default: 249 dev_warn(&adap->dev, "Unsupported transaction %d\n", size); 250 return -EOPNOTSUPP; 251 } 252 253 /* How about enabling interrupts... */ 254 outw_p(size & GE_CYC_TYPE_MASK, SMB_GLOBAL_ENABLE); 255 256 status = amd756_transaction(adap); 257 if (status) 258 return status; 259 260 if ((read_write == I2C_SMBUS_WRITE) || (size == AMD756_QUICK)) 261 return 0; 262 263 264 switch (size) { 265 case AMD756_BYTE: 266 data->byte = inw_p(SMB_HOST_DATA); 267 break; 268 case AMD756_BYTE_DATA: 269 data->byte = inw_p(SMB_HOST_DATA); 270 break; 271 case AMD756_WORD_DATA: 272 data->word = inw_p(SMB_HOST_DATA); /* TODO: endian???? */ 273 break; 274 case AMD756_BLOCK_DATA: 275 data->block[0] = inw_p(SMB_HOST_DATA) & 0x3f; 276 if(data->block[0] > 32) 277 data->block[0] = 32; 278 /* i = inw_p(SMBHSTCNT); Reset SMBBLKDAT */ 279 for (i = 1; i <= data->block[0]; i++) 280 data->block[i] = inb_p(SMB_HOST_BLOCK_DATA); 281 break; 282 } 283 284 return 0; 285 } 286 287 static u32 amd756_func(struct i2c_adapter *adapter) 288 { 289 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 290 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | 291 I2C_FUNC_SMBUS_BLOCK_DATA; 292 } 293 294 static const struct i2c_algorithm smbus_algorithm = { 295 .smbus_xfer = amd756_access, 296 .functionality = amd756_func, 297 }; 298 299 struct i2c_adapter amd756_smbus = { 300 .owner = THIS_MODULE, 301 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, 302 .algo = &smbus_algorithm, 303 }; 304 305 enum chiptype { AMD756, AMD766, AMD768, NFORCE, AMD8111 }; 306 static const char* chipname[] = { 307 "AMD756", "AMD766", "AMD768", 308 "nVidia nForce", "AMD8111", 309 }; 310 311 static struct pci_device_id amd756_ids[] = { 312 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_740B), 313 .driver_data = AMD756 }, 314 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_VIPER_7413), 315 .driver_data = AMD766 }, 316 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_OPUS_7443), 317 .driver_data = AMD768 }, 318 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_SMBUS), 319 .driver_data = AMD8111 }, 320 { PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_NFORCE_SMBUS), 321 .driver_data = NFORCE }, 322 { 0, } 323 }; 324 325 MODULE_DEVICE_TABLE (pci, amd756_ids); 326 327 static int __devinit amd756_probe(struct pci_dev *pdev, 328 const struct pci_device_id *id) 329 { 330 int nforce = (id->driver_data == NFORCE); 331 int error; 332 u8 temp; 333 334 if (amd756_ioport) { 335 dev_err(&pdev->dev, "Only one device supported " 336 "(you have a strange motherboard, btw)\n"); 337 return -ENODEV; 338 } 339 340 if (nforce) { 341 if (PCI_FUNC(pdev->devfn) != 1) 342 return -ENODEV; 343 344 pci_read_config_word(pdev, SMBBANFORCE, &amd756_ioport); 345 amd756_ioport &= 0xfffc; 346 } else { /* amd */ 347 if (PCI_FUNC(pdev->devfn) != 3) 348 return -ENODEV; 349 350 pci_read_config_byte(pdev, SMBGCFG, &temp); 351 if ((temp & 128) == 0) { 352 dev_err(&pdev->dev, 353 "Error: SMBus controller I/O not enabled!\n"); 354 return -ENODEV; 355 } 356 357 /* Determine the address of the SMBus areas */ 358 /* Technically it is a dword but... */ 359 pci_read_config_word(pdev, SMBBA, &amd756_ioport); 360 amd756_ioport &= 0xff00; 361 amd756_ioport += SMB_ADDR_OFFSET; 362 } 363 364 error = acpi_check_region(amd756_ioport, SMB_IOSIZE, 365 amd756_driver.name); 366 if (error) 367 return -ENODEV; 368 369 if (!request_region(amd756_ioport, SMB_IOSIZE, amd756_driver.name)) { 370 dev_err(&pdev->dev, "SMB region 0x%x already in use!\n", 371 amd756_ioport); 372 return -ENODEV; 373 } 374 375 pci_read_config_byte(pdev, SMBREV, &temp); 376 dev_dbg(&pdev->dev, "SMBREV = 0x%X\n", temp); 377 dev_dbg(&pdev->dev, "AMD756_smba = 0x%X\n", amd756_ioport); 378 379 /* set up the sysfs linkage to our parent device */ 380 amd756_smbus.dev.parent = &pdev->dev; 381 382 snprintf(amd756_smbus.name, sizeof(amd756_smbus.name), 383 "SMBus %s adapter at %04x", chipname[id->driver_data], 384 amd756_ioport); 385 386 error = i2c_add_adapter(&amd756_smbus); 387 if (error) { 388 dev_err(&pdev->dev, 389 "Adapter registration failed, module not inserted\n"); 390 goto out_err; 391 } 392 393 return 0; 394 395 out_err: 396 release_region(amd756_ioport, SMB_IOSIZE); 397 return error; 398 } 399 400 static void __devexit amd756_remove(struct pci_dev *dev) 401 { 402 i2c_del_adapter(&amd756_smbus); 403 release_region(amd756_ioport, SMB_IOSIZE); 404 } 405 406 static struct pci_driver amd756_driver = { 407 .name = "amd756_smbus", 408 .id_table = amd756_ids, 409 .probe = amd756_probe, 410 .remove = __devexit_p(amd756_remove), 411 }; 412 413 static int __init amd756_init(void) 414 { 415 return pci_register_driver(&amd756_driver); 416 } 417 418 static void __exit amd756_exit(void) 419 { 420 pci_unregister_driver(&amd756_driver); 421 } 422 423 MODULE_AUTHOR("Merlin Hughes <merlin@merlin.org>"); 424 MODULE_DESCRIPTION("AMD756/766/768/8111 and nVidia nForce SMBus driver"); 425 MODULE_LICENSE("GPL"); 426 427 EXPORT_SYMBOL(amd756_smbus); 428 429 module_init(amd756_init) 430 module_exit(amd756_exit) 431