1/* 2 Copyright (c) 1999 Frodo Looijaard <frodol@dds.nl> and 3 Philip Edelbrock <phil@netroedge.com> and 4 Mark D. Studebaker <mdsxyz123@yahoo.com> 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or 9 (at your option) any later version. 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 17/* 18 This is the driver for the SMB Host controller on 19 Acer Labs Inc. (ALI) M1541 and M1543C South Bridges. 20 21 The M1543C is a South bridge for desktop systems. 22 The M1533 is a South bridge for portable systems. 23 They are part of the following ALI chipsets: 24 "Aladdin Pro 2": Includes the M1621 Slot 1 North bridge 25 with AGP and 100MHz CPU Front Side bus 26 "Aladdin V": Includes the M1541 Socket 7 North bridge 27 with AGP and 100MHz CPU Front Side bus 28 "Aladdin IV": Includes the M1541 Socket 7 North bridge 29 with host bus up to 83.3 MHz. 30 For an overview of these chips see http://www.acerlabs.com 31 32 The M1533/M1543C devices appear as FOUR separate devices 33 on the PCI bus. An output of lspci will show something similar 34 to the following: 35 36 00:02.0 USB Controller: Acer Laboratories Inc. M5237 37 00:03.0 Bridge: Acer Laboratories Inc. M7101 38 00:07.0 ISA bridge: Acer Laboratories Inc. M1533 39 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 40 41 The SMB controller is part of the 7101 device, which is an 42 ACPI-compliant Power Management Unit (PMU). 43 44 The whole 7101 device has to be enabled for the SMB to work. 45 You can't just enable the SMB alone. 46 The SMB and the ACPI have separate I/O spaces. 47 We make sure that the SMB is enabled. We leave the ACPI alone. 48 49 This driver controls the SMB Host only. 50 The SMB Slave controller on the M15X3 is not enabled. 51 52 This driver does not use interrupts. 53*/ 54 55/* Note: we assume there can only be one ALI15X3, with one SMBus interface */ 56 57#include <linux/module.h> 58#include <linux/pci.h> 59#include <linux/kernel.h> 60#include <linux/stddef.h> 61#include <linux/ioport.h> 62#include <linux/delay.h> 63#include <linux/i2c.h> 64#include <linux/acpi.h> 65#include <linux/io.h> 66 67/* ALI15X3 SMBus address offsets */ 68#define SMBHSTSTS (0 + ali15x3_smba) 69#define SMBHSTCNT (1 + ali15x3_smba) 70#define SMBHSTSTART (2 + ali15x3_smba) 71#define SMBHSTCMD (7 + ali15x3_smba) 72#define SMBHSTADD (3 + ali15x3_smba) 73#define SMBHSTDAT0 (4 + ali15x3_smba) 74#define SMBHSTDAT1 (5 + ali15x3_smba) 75#define SMBBLKDAT (6 + ali15x3_smba) 76 77/* PCI Address Constants */ 78#define SMBCOM 0x004 79#define SMBBA 0x014 80#define SMBATPC 0x05B /* used to unlock xxxBA registers */ 81#define SMBHSTCFG 0x0E0 82#define SMBSLVC 0x0E1 83#define SMBCLK 0x0E2 84#define SMBREV 0x008 85 86/* Other settings */ 87#define MAX_TIMEOUT 200 /* times 1/100 sec */ 88#define ALI15X3_SMB_IOSIZE 32 89 90/* this is what the Award 1004 BIOS sets them to on a ASUS P5A MB. 91 We don't use these here. If the bases aren't set to some value we 92 tell user to upgrade BIOS and we fail. 93*/ 94#define ALI15X3_SMB_DEFAULTBASE 0xE800 95 96/* ALI15X3 address lock bits */ 97#define ALI15X3_LOCK 0x06 98 99/* ALI15X3 command constants */ 100#define ALI15X3_ABORT 0x02 101#define ALI15X3_T_OUT 0x04 102#define ALI15X3_QUICK 0x00 103#define ALI15X3_BYTE 0x10 104#define ALI15X3_BYTE_DATA 0x20 105#define ALI15X3_WORD_DATA 0x30 106#define ALI15X3_BLOCK_DATA 0x40 107#define ALI15X3_BLOCK_CLR 0x80 108 109/* ALI15X3 status register bits */ 110#define ALI15X3_STS_IDLE 0x04 111#define ALI15X3_STS_BUSY 0x08 112#define ALI15X3_STS_DONE 0x10 113#define ALI15X3_STS_DEV 0x20 /* device error */ 114#define ALI15X3_STS_COLL 0x40 /* collision or no response */ 115#define ALI15X3_STS_TERM 0x80 /* terminated by abort */ 116#define ALI15X3_STS_ERR 0xE0 /* all the bad error bits */ 117 118 119/* If force_addr is set to anything different from 0, we forcibly enable 120 the device at the given address. */ 121static u16 force_addr; 122module_param(force_addr, ushort, 0); 123MODULE_PARM_DESC(force_addr, 124 "Initialize the base address of the i2c controller"); 125 126static struct pci_driver ali15x3_driver; 127static unsigned short ali15x3_smba; 128 129static int ali15x3_setup(struct pci_dev *ALI15X3_dev) 130{ 131 u16 a; 132 unsigned char temp; 133 134 /* Check the following things: 135 - SMB I/O address is initialized 136 - Device is enabled 137 - We can use the addresses 138 */ 139 140 /* Unlock the register. 141 The data sheet says that the address registers are read-only 142 if the lock bits are 1, but in fact the address registers 143 are zero unless you clear the lock bits. 144 */ 145 pci_read_config_byte(ALI15X3_dev, SMBATPC, &temp); 146 if (temp & ALI15X3_LOCK) { 147 temp &= ~ALI15X3_LOCK; 148 pci_write_config_byte(ALI15X3_dev, SMBATPC, temp); 149 } 150 151 /* Determine the address of the SMBus area */ 152 pci_read_config_word(ALI15X3_dev, SMBBA, &ali15x3_smba); 153 ali15x3_smba &= (0xffff & ~(ALI15X3_SMB_IOSIZE - 1)); 154 if (ali15x3_smba == 0 && force_addr == 0) { 155 dev_err(&ALI15X3_dev->dev, "ALI15X3_smb region uninitialized " 156 "- upgrade BIOS or use force_addr=0xaddr\n"); 157 return -ENODEV; 158 } 159 160 if(force_addr) 161 ali15x3_smba = force_addr & ~(ALI15X3_SMB_IOSIZE - 1); 162 163 if (acpi_check_region(ali15x3_smba, ALI15X3_SMB_IOSIZE, 164 ali15x3_driver.name)) 165 return -EBUSY; 166 167 if (!request_region(ali15x3_smba, ALI15X3_SMB_IOSIZE, 168 ali15x3_driver.name)) { 169 dev_err(&ALI15X3_dev->dev, 170 "ALI15X3_smb region 0x%x already in use!\n", 171 ali15x3_smba); 172 return -ENODEV; 173 } 174 175 if(force_addr) { 176 dev_info(&ALI15X3_dev->dev, "forcing ISA address 0x%04X\n", 177 ali15x3_smba); 178 if (PCIBIOS_SUCCESSFUL != pci_write_config_word(ALI15X3_dev, 179 SMBBA, 180 ali15x3_smba)) 181 goto error; 182 if (PCIBIOS_SUCCESSFUL != pci_read_config_word(ALI15X3_dev, 183 SMBBA, &a)) 184 goto error; 185 if ((a & ~(ALI15X3_SMB_IOSIZE - 1)) != ali15x3_smba) { 186 /* make sure it works */ 187 dev_err(&ALI15X3_dev->dev, 188 "force address failed - not supported?\n"); 189 goto error; 190 } 191 } 192 /* check if whole device is enabled */ 193 pci_read_config_byte(ALI15X3_dev, SMBCOM, &temp); 194 if ((temp & 1) == 0) { 195 dev_info(&ALI15X3_dev->dev, "enabling SMBus device\n"); 196 pci_write_config_byte(ALI15X3_dev, SMBCOM, temp | 0x01); 197 } 198 199 /* Is SMB Host controller enabled? */ 200 pci_read_config_byte(ALI15X3_dev, SMBHSTCFG, &temp); 201 if ((temp & 1) == 0) { 202 dev_info(&ALI15X3_dev->dev, "enabling SMBus controller\n"); 203 pci_write_config_byte(ALI15X3_dev, SMBHSTCFG, temp | 0x01); 204 } 205 206 /* set SMB clock to 74KHz as recommended in data sheet */ 207 pci_write_config_byte(ALI15X3_dev, SMBCLK, 0x20); 208 209 /* 210 The interrupt routing for SMB is set up in register 0x77 in the 211 1533 ISA Bridge device, NOT in the 7101 device. 212 Don't bother with finding the 1533 device and reading the register. 213 if ((....... & 0x0F) == 1) 214 dev_dbg(&ALI15X3_dev->dev, "ALI15X3 using Interrupt 9 for SMBus.\n"); 215 */ 216 pci_read_config_byte(ALI15X3_dev, SMBREV, &temp); 217 dev_dbg(&ALI15X3_dev->dev, "SMBREV = 0x%X\n", temp); 218 dev_dbg(&ALI15X3_dev->dev, "iALI15X3_smba = 0x%X\n", ali15x3_smba); 219 220 return 0; 221error: 222 release_region(ali15x3_smba, ALI15X3_SMB_IOSIZE); 223 return -ENODEV; 224} 225 226/* Another internally used function */ 227static int ali15x3_transaction(struct i2c_adapter *adap) 228{ 229 int temp; 230 int result = 0; 231 int timeout = 0; 232 233 dev_dbg(&adap->dev, "Transaction (pre): STS=%02x, CNT=%02x, CMD=%02x, " 234 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTSTS), 235 inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD), 236 inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); 237 238 /* get status */ 239 temp = inb_p(SMBHSTSTS); 240 241 /* Make sure the SMBus host is ready to start transmitting */ 242 /* Check the busy bit first */ 243 if (temp & ALI15X3_STS_BUSY) { 244 /* 245 If the host controller is still busy, it may have timed out in the 246 previous transaction, resulting in a "SMBus Timeout" Dev. 247 I've tried the following to reset a stuck busy bit. 248 1. Reset the controller with an ABORT command. 249 (this doesn't seem to clear the controller if an external 250 device is hung) 251 2. Reset the controller and the other SMBus devices with a 252 T_OUT command. (this clears the host busy bit if an 253 external device is hung, but it comes back upon a new access 254 to a device) 255 3. Disable and reenable the controller in SMBHSTCFG 256 Worst case, nothing seems to work except power reset. 257 */ 258 /* Abort - reset the host controller */ 259 /* 260 Try resetting entire SMB bus, including other devices - 261 This may not work either - it clears the BUSY bit but 262 then the BUSY bit may come back on when you try and use the chip again. 263 If that's the case you are stuck. 264 */ 265 dev_info(&adap->dev, "Resetting entire SMB Bus to " 266 "clear busy condition (%02x)\n", temp); 267 outb_p(ALI15X3_T_OUT, SMBHSTCNT); 268 temp = inb_p(SMBHSTSTS); 269 } 270 271 /* now check the error bits and the busy bit */ 272 if (temp & (ALI15X3_STS_ERR | ALI15X3_STS_BUSY)) { 273 /* do a clear-on-write */ 274 outb_p(0xFF, SMBHSTSTS); 275 if ((temp = inb_p(SMBHSTSTS)) & 276 (ALI15X3_STS_ERR | ALI15X3_STS_BUSY)) { 277 /* this is probably going to be correctable only by a power reset 278 as one of the bits now appears to be stuck */ 279 /* This may be a bus or device with electrical problems. */ 280 dev_err(&adap->dev, "SMBus reset failed! (0x%02x) - " 281 "controller or device on bus is probably hung\n", 282 temp); 283 return -EBUSY; 284 } 285 } else { 286 /* check and clear done bit */ 287 if (temp & ALI15X3_STS_DONE) { 288 outb_p(temp, SMBHSTSTS); 289 } 290 } 291 292 /* start the transaction by writing anything to the start register */ 293 outb_p(0xFF, SMBHSTSTART); 294 295 /* We will always wait for a fraction of a second! */ 296 timeout = 0; 297 do { 298 msleep(1); 299 temp = inb_p(SMBHSTSTS); 300 } while ((!(temp & (ALI15X3_STS_ERR | ALI15X3_STS_DONE))) 301 && (timeout++ < MAX_TIMEOUT)); 302 303 /* If the SMBus is still busy, we give up */ 304 if (timeout > MAX_TIMEOUT) { 305 result = -ETIMEDOUT; 306 dev_err(&adap->dev, "SMBus Timeout!\n"); 307 } 308 309 if (temp & ALI15X3_STS_TERM) { 310 result = -EIO; 311 dev_dbg(&adap->dev, "Error: Failed bus transaction\n"); 312 } 313 314 /* 315 Unfortunately the ALI SMB controller maps "no response" and "bus 316 collision" into a single bit. No response is the usual case so don't 317 do a printk. 318 This means that bus collisions go unreported. 319 */ 320 if (temp & ALI15X3_STS_COLL) { 321 result = -ENXIO; 322 dev_dbg(&adap->dev, 323 "Error: no response or bus collision ADD=%02x\n", 324 inb_p(SMBHSTADD)); 325 } 326 327 /* haven't ever seen this */ 328 if (temp & ALI15X3_STS_DEV) { 329 result = -EIO; 330 dev_err(&adap->dev, "Error: device error\n"); 331 } 332 dev_dbg(&adap->dev, "Transaction (post): STS=%02x, CNT=%02x, CMD=%02x, " 333 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTSTS), 334 inb_p(SMBHSTCNT), inb_p(SMBHSTCMD), inb_p(SMBHSTADD), 335 inb_p(SMBHSTDAT0), inb_p(SMBHSTDAT1)); 336 return result; 337} 338 339/* Return negative errno on error. */ 340static s32 ali15x3_access(struct i2c_adapter * adap, u16 addr, 341 unsigned short flags, char read_write, u8 command, 342 int size, union i2c_smbus_data * data) 343{ 344 int i, len; 345 int temp; 346 int timeout; 347 348 /* clear all the bits (clear-on-write) */ 349 outb_p(0xFF, SMBHSTSTS); 350 /* make sure SMBus is idle */ 351 temp = inb_p(SMBHSTSTS); 352 for (timeout = 0; 353 (timeout < MAX_TIMEOUT) && !(temp & ALI15X3_STS_IDLE); 354 timeout++) { 355 msleep(1); 356 temp = inb_p(SMBHSTSTS); 357 } 358 if (timeout >= MAX_TIMEOUT) { 359 dev_err(&adap->dev, "Idle wait Timeout! STS=0x%02x\n", temp); 360 } 361 362 switch (size) { 363 case I2C_SMBUS_QUICK: 364 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), 365 SMBHSTADD); 366 size = ALI15X3_QUICK; 367 break; 368 case I2C_SMBUS_BYTE: 369 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), 370 SMBHSTADD); 371 if (read_write == I2C_SMBUS_WRITE) 372 outb_p(command, SMBHSTCMD); 373 size = ALI15X3_BYTE; 374 break; 375 case I2C_SMBUS_BYTE_DATA: 376 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), 377 SMBHSTADD); 378 outb_p(command, SMBHSTCMD); 379 if (read_write == I2C_SMBUS_WRITE) 380 outb_p(data->byte, SMBHSTDAT0); 381 size = ALI15X3_BYTE_DATA; 382 break; 383 case I2C_SMBUS_WORD_DATA: 384 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), 385 SMBHSTADD); 386 outb_p(command, SMBHSTCMD); 387 if (read_write == I2C_SMBUS_WRITE) { 388 outb_p(data->word & 0xff, SMBHSTDAT0); 389 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1); 390 } 391 size = ALI15X3_WORD_DATA; 392 break; 393 case I2C_SMBUS_BLOCK_DATA: 394 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01), 395 SMBHSTADD); 396 outb_p(command, SMBHSTCMD); 397 if (read_write == I2C_SMBUS_WRITE) { 398 len = data->block[0]; 399 if (len < 0) { 400 len = 0; 401 data->block[0] = len; 402 } 403 if (len > 32) { 404 len = 32; 405 data->block[0] = len; 406 } 407 outb_p(len, SMBHSTDAT0); 408 /* Reset SMBBLKDAT */ 409 outb_p(inb_p(SMBHSTCNT) | ALI15X3_BLOCK_CLR, SMBHSTCNT); 410 for (i = 1; i <= len; i++) 411 outb_p(data->block[i], SMBBLKDAT); 412 } 413 size = ALI15X3_BLOCK_DATA; 414 break; 415 default: 416 dev_warn(&adap->dev, "Unsupported transaction %d\n", size); 417 return -EOPNOTSUPP; 418 } 419 420 outb_p(size, SMBHSTCNT); /* output command */ 421 422 temp = ali15x3_transaction(adap); 423 if (temp) 424 return temp; 425 426 if ((read_write == I2C_SMBUS_WRITE) || (size == ALI15X3_QUICK)) 427 return 0; 428 429 430 switch (size) { 431 case ALI15X3_BYTE: /* Result put in SMBHSTDAT0 */ 432 data->byte = inb_p(SMBHSTDAT0); 433 break; 434 case ALI15X3_BYTE_DATA: 435 data->byte = inb_p(SMBHSTDAT0); 436 break; 437 case ALI15X3_WORD_DATA: 438 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8); 439 break; 440 case ALI15X3_BLOCK_DATA: 441 len = inb_p(SMBHSTDAT0); 442 if (len > 32) 443 len = 32; 444 data->block[0] = len; 445 /* Reset SMBBLKDAT */ 446 outb_p(inb_p(SMBHSTCNT) | ALI15X3_BLOCK_CLR, SMBHSTCNT); 447 for (i = 1; i <= data->block[0]; i++) { 448 data->block[i] = inb_p(SMBBLKDAT); 449 dev_dbg(&adap->dev, "Blk: len=%d, i=%d, data=%02x\n", 450 len, i, data->block[i]); 451 } 452 break; 453 } 454 return 0; 455} 456 457static u32 ali15x3_func(struct i2c_adapter *adapter) 458{ 459 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 460 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | 461 I2C_FUNC_SMBUS_BLOCK_DATA; 462} 463 464static const struct i2c_algorithm smbus_algorithm = { 465 .smbus_xfer = ali15x3_access, 466 .functionality = ali15x3_func, 467}; 468 469static struct i2c_adapter ali15x3_adapter = { 470 .owner = THIS_MODULE, 471 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, 472 .algo = &smbus_algorithm, 473}; 474 475static const struct pci_device_id ali15x3_ids[] = { 476 { PCI_DEVICE(PCI_VENDOR_ID_AL, PCI_DEVICE_ID_AL_M7101) }, 477 { 0, } 478}; 479 480MODULE_DEVICE_TABLE (pci, ali15x3_ids); 481 482static int ali15x3_probe(struct pci_dev *dev, const struct pci_device_id *id) 483{ 484 if (ali15x3_setup(dev)) { 485 dev_err(&dev->dev, 486 "ALI15X3 not detected, module not inserted.\n"); 487 return -ENODEV; 488 } 489 490 /* set up the sysfs linkage to our parent device */ 491 ali15x3_adapter.dev.parent = &dev->dev; 492 493 snprintf(ali15x3_adapter.name, sizeof(ali15x3_adapter.name), 494 "SMBus ALI15X3 adapter at %04x", ali15x3_smba); 495 return i2c_add_adapter(&ali15x3_adapter); 496} 497 498static void ali15x3_remove(struct pci_dev *dev) 499{ 500 i2c_del_adapter(&ali15x3_adapter); 501 release_region(ali15x3_smba, ALI15X3_SMB_IOSIZE); 502} 503 504static struct pci_driver ali15x3_driver = { 505 .name = "ali15x3_smbus", 506 .id_table = ali15x3_ids, 507 .probe = ali15x3_probe, 508 .remove = ali15x3_remove, 509}; 510 511module_pci_driver(ali15x3_driver); 512 513MODULE_AUTHOR ("Frodo Looijaard <frodol@dds.nl>, " 514 "Philip Edelbrock <phil@netroedge.com>, " 515 "and Mark D. Studebaker <mdsxyz123@yahoo.com>"); 516MODULE_DESCRIPTION("ALI15X3 SMBus driver"); 517MODULE_LICENSE("GPL"); 518