1 /* 2 sis5595.c - Part of lm_sensors, Linux kernel modules for hardware 3 monitoring 4 Copyright (c) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and 5 Philip Edelbrock <phil@netroedge.com> 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 2 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 20 */ 21 22 /* Note: we assume there can only be one SIS5595 with one SMBus interface */ 23 24 /* 25 Note: all have mfr. ID 0x1039. 26 SUPPORTED PCI ID 27 5595 0008 28 29 Note: these chips contain a 0008 device which is incompatible with the 30 5595. We recognize these by the presence of the listed 31 "blacklist" PCI ID and refuse to load. 32 33 NOT SUPPORTED PCI ID BLACKLIST PCI ID 34 540 0008 0540 35 550 0008 0550 36 5513 0008 5511 37 5581 0008 5597 38 5582 0008 5597 39 5597 0008 5597 40 5598 0008 5597/5598 41 630 0008 0630 42 645 0008 0645 43 646 0008 0646 44 648 0008 0648 45 650 0008 0650 46 651 0008 0651 47 730 0008 0730 48 735 0008 0735 49 745 0008 0745 50 746 0008 0746 51 */ 52 53 /* TO DO: 54 * Add Block Transfers (ugly, but supported by the adapter) 55 * Add adapter resets 56 */ 57 58 #include <linux/kernel.h> 59 #include <linux/module.h> 60 #include <linux/delay.h> 61 #include <linux/pci.h> 62 #include <linux/ioport.h> 63 #include <linux/init.h> 64 #include <linux/i2c.h> 65 #include <asm/io.h> 66 67 static int blacklist[] = { 68 PCI_DEVICE_ID_SI_540, 69 PCI_DEVICE_ID_SI_550, 70 PCI_DEVICE_ID_SI_630, 71 PCI_DEVICE_ID_SI_645, 72 PCI_DEVICE_ID_SI_646, 73 PCI_DEVICE_ID_SI_648, 74 PCI_DEVICE_ID_SI_650, 75 PCI_DEVICE_ID_SI_651, 76 PCI_DEVICE_ID_SI_730, 77 PCI_DEVICE_ID_SI_735, 78 PCI_DEVICE_ID_SI_745, 79 PCI_DEVICE_ID_SI_746, 80 PCI_DEVICE_ID_SI_5511, /* 5513 chip has the 0008 device but that ID 81 shows up in other chips so we use the 5511 82 ID for recognition */ 83 PCI_DEVICE_ID_SI_5597, 84 PCI_DEVICE_ID_SI_5598, 85 0, /* terminates the list */ 86 }; 87 88 /* Length of ISA address segment */ 89 #define SIS5595_EXTENT 8 90 /* SIS5595 SMBus registers */ 91 #define SMB_STS_LO 0x00 92 #define SMB_STS_HI 0x01 93 #define SMB_CTL_LO 0x02 94 #define SMB_CTL_HI 0x03 95 #define SMB_ADDR 0x04 96 #define SMB_CMD 0x05 97 #define SMB_PCNT 0x06 98 #define SMB_CNT 0x07 99 #define SMB_BYTE 0x08 100 #define SMB_DEV 0x10 101 #define SMB_DB0 0x11 102 #define SMB_DB1 0x12 103 #define SMB_HAA 0x13 104 105 /* PCI Address Constants */ 106 #define SMB_INDEX 0x38 107 #define SMB_DAT 0x39 108 #define SIS5595_ENABLE_REG 0x40 109 #define ACPI_BASE 0x90 110 111 /* Other settings */ 112 #define MAX_TIMEOUT 500 113 114 /* SIS5595 constants */ 115 #define SIS5595_QUICK 0x00 116 #define SIS5595_BYTE 0x02 117 #define SIS5595_BYTE_DATA 0x04 118 #define SIS5595_WORD_DATA 0x06 119 #define SIS5595_PROC_CALL 0x08 120 #define SIS5595_BLOCK_DATA 0x0A 121 122 /* insmod parameters */ 123 124 /* If force_addr is set to anything different from 0, we forcibly enable 125 the device at the given address. */ 126 static u16 force_addr; 127 module_param(force_addr, ushort, 0); 128 MODULE_PARM_DESC(force_addr, "Initialize the base address of the i2c controller"); 129 130 static struct pci_driver sis5595_driver; 131 static unsigned short sis5595_base; 132 static struct pci_dev *sis5595_pdev; 133 134 static u8 sis5595_read(u8 reg) 135 { 136 outb(reg, sis5595_base + SMB_INDEX); 137 return inb(sis5595_base + SMB_DAT); 138 } 139 140 static void sis5595_write(u8 reg, u8 data) 141 { 142 outb(reg, sis5595_base + SMB_INDEX); 143 outb(data, sis5595_base + SMB_DAT); 144 } 145 146 static int sis5595_setup(struct pci_dev *SIS5595_dev) 147 { 148 u16 a; 149 u8 val; 150 int *i; 151 int retval = -ENODEV; 152 153 /* Look for imposters */ 154 for (i = blacklist; *i != 0; i++) { 155 struct pci_dev *dev; 156 dev = pci_get_device(PCI_VENDOR_ID_SI, *i, NULL); 157 if (dev) { 158 dev_err(&SIS5595_dev->dev, "Looked for SIS5595 but found unsupported device %.4x\n", *i); 159 pci_dev_put(dev); 160 return -ENODEV; 161 } 162 } 163 164 /* Determine the address of the SMBus areas */ 165 pci_read_config_word(SIS5595_dev, ACPI_BASE, &sis5595_base); 166 if (sis5595_base == 0 && force_addr == 0) { 167 dev_err(&SIS5595_dev->dev, "ACPI base address uninitialized - upgrade BIOS or use force_addr=0xaddr\n"); 168 return -ENODEV; 169 } 170 171 if (force_addr) 172 sis5595_base = force_addr & ~(SIS5595_EXTENT - 1); 173 dev_dbg(&SIS5595_dev->dev, "ACPI Base address: %04x\n", sis5595_base); 174 175 /* NB: We grab just the two SMBus registers here, but this may still 176 * interfere with ACPI :-( */ 177 if (!request_region(sis5595_base + SMB_INDEX, 2, 178 sis5595_driver.name)) { 179 dev_err(&SIS5595_dev->dev, "SMBus registers 0x%04x-0x%04x already in use!\n", 180 sis5595_base + SMB_INDEX, sis5595_base + SMB_INDEX + 1); 181 return -ENODEV; 182 } 183 184 if (force_addr) { 185 dev_info(&SIS5595_dev->dev, "forcing ISA address 0x%04X\n", sis5595_base); 186 if (pci_write_config_word(SIS5595_dev, ACPI_BASE, sis5595_base) 187 != PCIBIOS_SUCCESSFUL) 188 goto error; 189 if (pci_read_config_word(SIS5595_dev, ACPI_BASE, &a) 190 != PCIBIOS_SUCCESSFUL) 191 goto error; 192 if ((a & ~(SIS5595_EXTENT - 1)) != sis5595_base) { 193 /* doesn't work for some chips! */ 194 dev_err(&SIS5595_dev->dev, "force address failed - not supported?\n"); 195 goto error; 196 } 197 } 198 199 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val) 200 != PCIBIOS_SUCCESSFUL) 201 goto error; 202 if ((val & 0x80) == 0) { 203 dev_info(&SIS5595_dev->dev, "enabling ACPI\n"); 204 if (pci_write_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, val | 0x80) 205 != PCIBIOS_SUCCESSFUL) 206 goto error; 207 if (pci_read_config_byte(SIS5595_dev, SIS5595_ENABLE_REG, &val) 208 != PCIBIOS_SUCCESSFUL) 209 goto error; 210 if ((val & 0x80) == 0) { 211 /* doesn't work for some chips? */ 212 dev_err(&SIS5595_dev->dev, "ACPI enable failed - not supported?\n"); 213 goto error; 214 } 215 } 216 217 /* Everything is happy */ 218 return 0; 219 220 error: 221 release_region(sis5595_base + SMB_INDEX, 2); 222 return retval; 223 } 224 225 static int sis5595_transaction(struct i2c_adapter *adap) 226 { 227 int temp; 228 int result = 0; 229 int timeout = 0; 230 231 /* Make sure the SMBus host is ready to start transmitting */ 232 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8); 233 if (temp != 0x00) { 234 dev_dbg(&adap->dev, "SMBus busy (%04x). Resetting...\n", temp); 235 sis5595_write(SMB_STS_LO, temp & 0xff); 236 sis5595_write(SMB_STS_HI, temp >> 8); 237 if ((temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8)) != 0x00) { 238 dev_dbg(&adap->dev, "Failed! (%02x)\n", temp); 239 return -EBUSY; 240 } else { 241 dev_dbg(&adap->dev, "Successful!\n"); 242 } 243 } 244 245 /* start the transaction by setting bit 4 */ 246 sis5595_write(SMB_CTL_LO, sis5595_read(SMB_CTL_LO) | 0x10); 247 248 /* We will always wait for a fraction of a second! */ 249 do { 250 msleep(1); 251 temp = sis5595_read(SMB_STS_LO); 252 } while (!(temp & 0x40) && (timeout++ < MAX_TIMEOUT)); 253 254 /* If the SMBus is still busy, we give up */ 255 if (timeout >= MAX_TIMEOUT) { 256 dev_dbg(&adap->dev, "SMBus Timeout!\n"); 257 result = -ETIMEDOUT; 258 } 259 260 if (temp & 0x10) { 261 dev_dbg(&adap->dev, "Error: Failed bus transaction\n"); 262 result = -ENXIO; 263 } 264 265 if (temp & 0x20) { 266 dev_err(&adap->dev, "Bus collision! SMBus may be locked until " 267 "next hard reset (or not...)\n"); 268 /* Clock stops and slave is stuck in mid-transmission */ 269 result = -EIO; 270 } 271 272 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8); 273 if (temp != 0x00) { 274 sis5595_write(SMB_STS_LO, temp & 0xff); 275 sis5595_write(SMB_STS_HI, temp >> 8); 276 } 277 278 temp = sis5595_read(SMB_STS_LO) + (sis5595_read(SMB_STS_HI) << 8); 279 if (temp != 0x00) 280 dev_dbg(&adap->dev, "Failed reset at end of transaction (%02x)\n", temp); 281 282 return result; 283 } 284 285 /* Return negative errno on error. */ 286 static s32 sis5595_access(struct i2c_adapter *adap, u16 addr, 287 unsigned short flags, char read_write, 288 u8 command, int size, union i2c_smbus_data *data) 289 { 290 int status; 291 292 switch (size) { 293 case I2C_SMBUS_QUICK: 294 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); 295 size = SIS5595_QUICK; 296 break; 297 case I2C_SMBUS_BYTE: 298 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); 299 if (read_write == I2C_SMBUS_WRITE) 300 sis5595_write(SMB_CMD, command); 301 size = SIS5595_BYTE; 302 break; 303 case I2C_SMBUS_BYTE_DATA: 304 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); 305 sis5595_write(SMB_CMD, command); 306 if (read_write == I2C_SMBUS_WRITE) 307 sis5595_write(SMB_BYTE, data->byte); 308 size = SIS5595_BYTE_DATA; 309 break; 310 case I2C_SMBUS_PROC_CALL: 311 case I2C_SMBUS_WORD_DATA: 312 sis5595_write(SMB_ADDR, ((addr & 0x7f) << 1) | (read_write & 0x01)); 313 sis5595_write(SMB_CMD, command); 314 if (read_write == I2C_SMBUS_WRITE) { 315 sis5595_write(SMB_BYTE, data->word & 0xff); 316 sis5595_write(SMB_BYTE + 1, 317 (data->word & 0xff00) >> 8); 318 } 319 size = (size == I2C_SMBUS_PROC_CALL) ? SIS5595_PROC_CALL : SIS5595_WORD_DATA; 320 break; 321 default: 322 dev_warn(&adap->dev, "Unsupported transaction %d\n", size); 323 return -EOPNOTSUPP; 324 } 325 326 sis5595_write(SMB_CTL_LO, ((size & 0x0E))); 327 328 status = sis5595_transaction(adap); 329 if (status) 330 return status; 331 332 if ((size != SIS5595_PROC_CALL) && 333 ((read_write == I2C_SMBUS_WRITE) || (size == SIS5595_QUICK))) 334 return 0; 335 336 337 switch (size) { 338 case SIS5595_BYTE: 339 case SIS5595_BYTE_DATA: 340 data->byte = sis5595_read(SMB_BYTE); 341 break; 342 case SIS5595_WORD_DATA: 343 case SIS5595_PROC_CALL: 344 data->word = sis5595_read(SMB_BYTE) + (sis5595_read(SMB_BYTE + 1) << 8); 345 break; 346 } 347 return 0; 348 } 349 350 static u32 sis5595_func(struct i2c_adapter *adapter) 351 { 352 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | 353 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | 354 I2C_FUNC_SMBUS_PROC_CALL; 355 } 356 357 static const struct i2c_algorithm smbus_algorithm = { 358 .smbus_xfer = sis5595_access, 359 .functionality = sis5595_func, 360 }; 361 362 static struct i2c_adapter sis5595_adapter = { 363 .owner = THIS_MODULE, 364 .id = I2C_HW_SMBUS_SIS5595, 365 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, 366 .algo = &smbus_algorithm, 367 }; 368 369 static struct pci_device_id sis5595_ids[] __devinitdata = { 370 { PCI_DEVICE(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_503) }, 371 { 0, } 372 }; 373 374 MODULE_DEVICE_TABLE (pci, sis5595_ids); 375 376 static int __devinit sis5595_probe(struct pci_dev *dev, const struct pci_device_id *id) 377 { 378 int err; 379 380 if (sis5595_setup(dev)) { 381 dev_err(&dev->dev, "SIS5595 not detected, module not inserted.\n"); 382 return -ENODEV; 383 } 384 385 /* set up the sysfs linkage to our parent device */ 386 sis5595_adapter.dev.parent = &dev->dev; 387 388 sprintf(sis5595_adapter.name, "SMBus SIS5595 adapter at %04x", 389 sis5595_base + SMB_INDEX); 390 err = i2c_add_adapter(&sis5595_adapter); 391 if (err) { 392 release_region(sis5595_base + SMB_INDEX, 2); 393 return err; 394 } 395 396 /* Always return failure here. This is to allow other drivers to bind 397 * to this pci device. We don't really want to have control over the 398 * pci device, we only wanted to read as few register values from it. 399 */ 400 sis5595_pdev = pci_dev_get(dev); 401 return -ENODEV; 402 } 403 404 static struct pci_driver sis5595_driver = { 405 .name = "sis5595_smbus", 406 .id_table = sis5595_ids, 407 .probe = sis5595_probe, 408 }; 409 410 static int __init i2c_sis5595_init(void) 411 { 412 return pci_register_driver(&sis5595_driver); 413 } 414 415 static void __exit i2c_sis5595_exit(void) 416 { 417 pci_unregister_driver(&sis5595_driver); 418 if (sis5595_pdev) { 419 i2c_del_adapter(&sis5595_adapter); 420 release_region(sis5595_base + SMB_INDEX, 2); 421 pci_dev_put(sis5595_pdev); 422 sis5595_pdev = NULL; 423 } 424 } 425 426 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>"); 427 MODULE_DESCRIPTION("SIS5595 SMBus driver"); 428 MODULE_LICENSE("GPL"); 429 430 module_init(i2c_sis5595_init); 431 module_exit(i2c_sis5595_exit); 432