1 /* 2 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB 3 * temperature sensors 4 * Copyright (C) 2007 IBM 5 * 6 * Author: Darrick J. Wong <djwong@us.ibm.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 21 */ 22 23 #include <linux/module.h> 24 #include <linux/jiffies.h> 25 #include <linux/hwmon.h> 26 #include <linux/hwmon-sysfs.h> 27 #include <linux/err.h> 28 #include <linux/mutex.h> 29 #include <linux/delay.h> 30 #include <linux/log2.h> 31 #include <linux/pci.h> 32 #include <linux/platform_device.h> 33 #include <linux/slab.h> 34 35 #define DRVNAME "i5k_amb" 36 37 #define I5K_REG_AMB_BASE_ADDR 0x48 38 #define I5K_REG_AMB_LEN_ADDR 0x50 39 #define I5K_REG_CHAN0_PRESENCE_ADDR 0x64 40 #define I5K_REG_CHAN1_PRESENCE_ADDR 0x66 41 42 #define AMB_REG_TEMP_MIN_ADDR 0x80 43 #define AMB_REG_TEMP_MID_ADDR 0x81 44 #define AMB_REG_TEMP_MAX_ADDR 0x82 45 #define AMB_REG_TEMP_STATUS_ADDR 0x84 46 #define AMB_REG_TEMP_ADDR 0x85 47 48 #define AMB_CONFIG_SIZE 2048 49 #define AMB_FUNC_3_OFFSET 768 50 51 static unsigned long amb_reg_temp_status(unsigned int amb) 52 { 53 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR + 54 AMB_CONFIG_SIZE * amb; 55 } 56 57 static unsigned long amb_reg_temp_min(unsigned int amb) 58 { 59 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR + 60 AMB_CONFIG_SIZE * amb; 61 } 62 63 static unsigned long amb_reg_temp_mid(unsigned int amb) 64 { 65 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR + 66 AMB_CONFIG_SIZE * amb; 67 } 68 69 static unsigned long amb_reg_temp_max(unsigned int amb) 70 { 71 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR + 72 AMB_CONFIG_SIZE * amb; 73 } 74 75 static unsigned long amb_reg_temp(unsigned int amb) 76 { 77 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR + 78 AMB_CONFIG_SIZE * amb; 79 } 80 81 #define MAX_MEM_CHANNELS 4 82 #define MAX_AMBS_PER_CHANNEL 16 83 #define MAX_AMBS (MAX_MEM_CHANNELS * \ 84 MAX_AMBS_PER_CHANNEL) 85 #define CHANNEL_SHIFT 4 86 #define DIMM_MASK 0xF 87 /* 88 * Ugly hack: For some reason the highest bit is set if there 89 * are _any_ DIMMs in the channel. Attempting to read from 90 * this "high-order" AMB results in a memory bus error, so 91 * for now we'll just ignore that top bit, even though that 92 * might prevent us from seeing the 16th DIMM in the channel. 93 */ 94 #define REAL_MAX_AMBS_PER_CHANNEL 15 95 #define KNOBS_PER_AMB 6 96 97 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit) 98 { 99 return byte_num * MAX_AMBS_PER_CHANNEL + bit; 100 } 101 102 #define AMB_SYSFS_NAME_LEN 16 103 struct i5k_device_attribute { 104 struct sensor_device_attribute s_attr; 105 char name[AMB_SYSFS_NAME_LEN]; 106 }; 107 108 struct i5k_amb_data { 109 struct device *hwmon_dev; 110 111 unsigned long amb_base; 112 unsigned long amb_len; 113 u16 amb_present[MAX_MEM_CHANNELS]; 114 void __iomem *amb_mmio; 115 struct i5k_device_attribute *attrs; 116 unsigned int num_attrs; 117 unsigned long chipset_id; 118 }; 119 120 static ssize_t show_name(struct device *dev, struct device_attribute *devattr, 121 char *buf) 122 { 123 return sprintf(buf, "%s\n", DRVNAME); 124 } 125 126 127 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 128 129 static struct platform_device *amb_pdev; 130 131 static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset) 132 { 133 return ioread8(data->amb_mmio + offset); 134 } 135 136 static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset, 137 u8 val) 138 { 139 iowrite8(val, data->amb_mmio + offset); 140 } 141 142 static ssize_t show_amb_alarm(struct device *dev, 143 struct device_attribute *devattr, 144 char *buf) 145 { 146 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 147 struct i5k_amb_data *data = dev_get_drvdata(dev); 148 149 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) && 150 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8)) 151 return sprintf(buf, "1\n"); 152 else 153 return sprintf(buf, "0\n"); 154 } 155 156 static ssize_t store_amb_min(struct device *dev, 157 struct device_attribute *devattr, 158 const char *buf, 159 size_t count) 160 { 161 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 162 struct i5k_amb_data *data = dev_get_drvdata(dev); 163 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500; 164 165 if (temp > 255) 166 temp = 255; 167 168 amb_write_byte(data, amb_reg_temp_min(attr->index), temp); 169 return count; 170 } 171 172 static ssize_t store_amb_mid(struct device *dev, 173 struct device_attribute *devattr, 174 const char *buf, 175 size_t count) 176 { 177 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 178 struct i5k_amb_data *data = dev_get_drvdata(dev); 179 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500; 180 181 if (temp > 255) 182 temp = 255; 183 184 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp); 185 return count; 186 } 187 188 static ssize_t store_amb_max(struct device *dev, 189 struct device_attribute *devattr, 190 const char *buf, 191 size_t count) 192 { 193 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 194 struct i5k_amb_data *data = dev_get_drvdata(dev); 195 unsigned long temp = simple_strtoul(buf, NULL, 10) / 500; 196 197 if (temp > 255) 198 temp = 255; 199 200 amb_write_byte(data, amb_reg_temp_max(attr->index), temp); 201 return count; 202 } 203 204 static ssize_t show_amb_min(struct device *dev, 205 struct device_attribute *devattr, 206 char *buf) 207 { 208 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 209 struct i5k_amb_data *data = dev_get_drvdata(dev); 210 return sprintf(buf, "%d\n", 211 500 * amb_read_byte(data, amb_reg_temp_min(attr->index))); 212 } 213 214 static ssize_t show_amb_mid(struct device *dev, 215 struct device_attribute *devattr, 216 char *buf) 217 { 218 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 219 struct i5k_amb_data *data = dev_get_drvdata(dev); 220 return sprintf(buf, "%d\n", 221 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index))); 222 } 223 224 static ssize_t show_amb_max(struct device *dev, 225 struct device_attribute *devattr, 226 char *buf) 227 { 228 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 229 struct i5k_amb_data *data = dev_get_drvdata(dev); 230 return sprintf(buf, "%d\n", 231 500 * amb_read_byte(data, amb_reg_temp_max(attr->index))); 232 } 233 234 static ssize_t show_amb_temp(struct device *dev, 235 struct device_attribute *devattr, 236 char *buf) 237 { 238 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 239 struct i5k_amb_data *data = dev_get_drvdata(dev); 240 return sprintf(buf, "%d\n", 241 500 * amb_read_byte(data, amb_reg_temp(attr->index))); 242 } 243 244 static ssize_t show_label(struct device *dev, 245 struct device_attribute *devattr, 246 char *buf) 247 { 248 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 249 250 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT, 251 attr->index & DIMM_MASK); 252 } 253 254 static int __devinit i5k_amb_hwmon_init(struct platform_device *pdev) 255 { 256 int i, j, k, d = 0; 257 u16 c; 258 int res = 0; 259 int num_ambs = 0; 260 struct i5k_amb_data *data = platform_get_drvdata(pdev); 261 262 /* Count the number of AMBs found */ 263 /* ignore the high-order bit, see "Ugly hack" comment above */ 264 for (i = 0; i < MAX_MEM_CHANNELS; i++) 265 num_ambs += hweight16(data->amb_present[i] & 0x7fff); 266 267 /* Set up sysfs stuff */ 268 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB, 269 GFP_KERNEL); 270 if (!data->attrs) 271 return -ENOMEM; 272 data->num_attrs = 0; 273 274 for (i = 0; i < MAX_MEM_CHANNELS; i++) { 275 c = data->amb_present[i]; 276 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) { 277 struct i5k_device_attribute *iattr; 278 279 k = amb_num_from_reg(i, j); 280 if (!(c & 0x1)) 281 continue; 282 d++; 283 284 /* sysfs label */ 285 iattr = data->attrs + data->num_attrs; 286 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 287 "temp%d_label", d); 288 iattr->s_attr.dev_attr.attr.name = iattr->name; 289 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 290 iattr->s_attr.dev_attr.show = show_label; 291 iattr->s_attr.index = k; 292 res = device_create_file(&pdev->dev, 293 &iattr->s_attr.dev_attr); 294 if (res) 295 goto exit_remove; 296 data->num_attrs++; 297 298 /* Temperature sysfs knob */ 299 iattr = data->attrs + data->num_attrs; 300 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 301 "temp%d_input", d); 302 iattr->s_attr.dev_attr.attr.name = iattr->name; 303 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 304 iattr->s_attr.dev_attr.show = show_amb_temp; 305 iattr->s_attr.index = k; 306 res = device_create_file(&pdev->dev, 307 &iattr->s_attr.dev_attr); 308 if (res) 309 goto exit_remove; 310 data->num_attrs++; 311 312 /* Temperature min sysfs knob */ 313 iattr = data->attrs + data->num_attrs; 314 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 315 "temp%d_min", d); 316 iattr->s_attr.dev_attr.attr.name = iattr->name; 317 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 318 iattr->s_attr.dev_attr.show = show_amb_min; 319 iattr->s_attr.dev_attr.store = store_amb_min; 320 iattr->s_attr.index = k; 321 res = device_create_file(&pdev->dev, 322 &iattr->s_attr.dev_attr); 323 if (res) 324 goto exit_remove; 325 data->num_attrs++; 326 327 /* Temperature mid sysfs knob */ 328 iattr = data->attrs + data->num_attrs; 329 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 330 "temp%d_mid", d); 331 iattr->s_attr.dev_attr.attr.name = iattr->name; 332 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 333 iattr->s_attr.dev_attr.show = show_amb_mid; 334 iattr->s_attr.dev_attr.store = store_amb_mid; 335 iattr->s_attr.index = k; 336 res = device_create_file(&pdev->dev, 337 &iattr->s_attr.dev_attr); 338 if (res) 339 goto exit_remove; 340 data->num_attrs++; 341 342 /* Temperature max sysfs knob */ 343 iattr = data->attrs + data->num_attrs; 344 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 345 "temp%d_max", d); 346 iattr->s_attr.dev_attr.attr.name = iattr->name; 347 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 348 iattr->s_attr.dev_attr.show = show_amb_max; 349 iattr->s_attr.dev_attr.store = store_amb_max; 350 iattr->s_attr.index = k; 351 res = device_create_file(&pdev->dev, 352 &iattr->s_attr.dev_attr); 353 if (res) 354 goto exit_remove; 355 data->num_attrs++; 356 357 /* Temperature alarm sysfs knob */ 358 iattr = data->attrs + data->num_attrs; 359 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 360 "temp%d_alarm", d); 361 iattr->s_attr.dev_attr.attr.name = iattr->name; 362 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 363 iattr->s_attr.dev_attr.show = show_amb_alarm; 364 iattr->s_attr.index = k; 365 res = device_create_file(&pdev->dev, 366 &iattr->s_attr.dev_attr); 367 if (res) 368 goto exit_remove; 369 data->num_attrs++; 370 } 371 } 372 373 res = device_create_file(&pdev->dev, &dev_attr_name); 374 if (res) 375 goto exit_remove; 376 377 data->hwmon_dev = hwmon_device_register(&pdev->dev); 378 if (IS_ERR(data->hwmon_dev)) { 379 res = PTR_ERR(data->hwmon_dev); 380 goto exit_remove; 381 } 382 383 return res; 384 385 exit_remove: 386 device_remove_file(&pdev->dev, &dev_attr_name); 387 for (i = 0; i < data->num_attrs; i++) 388 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); 389 kfree(data->attrs); 390 391 return res; 392 } 393 394 static int __devinit i5k_amb_add(void) 395 { 396 int res = -ENODEV; 397 398 /* only ever going to be one of these */ 399 amb_pdev = platform_device_alloc(DRVNAME, 0); 400 if (!amb_pdev) 401 return -ENOMEM; 402 403 res = platform_device_add(amb_pdev); 404 if (res) 405 goto err; 406 return 0; 407 408 err: 409 platform_device_put(amb_pdev); 410 return res; 411 } 412 413 static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data, 414 unsigned long devid) 415 { 416 struct pci_dev *pcidev; 417 u32 val32; 418 int res = -ENODEV; 419 420 /* Find AMB register memory space */ 421 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, 422 devid, 423 NULL); 424 if (!pcidev) 425 return -ENODEV; 426 427 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32)) 428 goto out; 429 data->amb_base = val32; 430 431 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32)) 432 goto out; 433 data->amb_len = val32; 434 435 /* Is it big enough? */ 436 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) { 437 dev_err(&pcidev->dev, "AMB region too small!\n"); 438 goto out; 439 } 440 441 data->chipset_id = devid; 442 443 res = 0; 444 out: 445 pci_dev_put(pcidev); 446 return res; 447 } 448 449 static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id) 450 { 451 struct pci_dev *pcidev; 452 u16 val16; 453 int res = -ENODEV; 454 455 /* Copy the DIMM presence map for these two channels */ 456 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL); 457 if (!pcidev) 458 return -ENODEV; 459 460 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16)) 461 goto out; 462 amb_present[0] = val16; 463 464 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16)) 465 goto out; 466 amb_present[1] = val16; 467 468 res = 0; 469 470 out: 471 pci_dev_put(pcidev); 472 return res; 473 } 474 475 static unsigned long i5k_channel_pci_id(struct i5k_amb_data *data, 476 unsigned long channel) 477 { 478 switch (data->chipset_id) { 479 case PCI_DEVICE_ID_INTEL_5000_ERR: 480 return PCI_DEVICE_ID_INTEL_5000_FBD0 + channel; 481 case PCI_DEVICE_ID_INTEL_5400_ERR: 482 return PCI_DEVICE_ID_INTEL_5400_FBD0 + channel; 483 default: 484 BUG(); 485 } 486 } 487 488 static unsigned long chipset_ids[] = { 489 PCI_DEVICE_ID_INTEL_5000_ERR, 490 PCI_DEVICE_ID_INTEL_5400_ERR, 491 0 492 }; 493 494 static struct pci_device_id i5k_amb_ids[] __devinitdata = { 495 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) }, 496 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) }, 497 { 0, } 498 }; 499 MODULE_DEVICE_TABLE(pci, i5k_amb_ids); 500 501 static int __devinit i5k_amb_probe(struct platform_device *pdev) 502 { 503 struct i5k_amb_data *data; 504 struct resource *reso; 505 int i; 506 int res = -ENODEV; 507 508 data = kzalloc(sizeof(*data), GFP_KERNEL); 509 if (!data) 510 return -ENOMEM; 511 512 /* Figure out where the AMB registers live */ 513 i = 0; 514 do { 515 res = i5k_find_amb_registers(data, chipset_ids[i]); 516 i++; 517 } while (res && chipset_ids[i]); 518 519 if (res) 520 goto err; 521 522 /* Copy the DIMM presence map for the first two channels */ 523 res = i5k_channel_probe(&data->amb_present[0], 524 i5k_channel_pci_id(data, 0)); 525 if (res) 526 goto err; 527 528 /* Copy the DIMM presence map for the optional second two channels */ 529 i5k_channel_probe(&data->amb_present[2], 530 i5k_channel_pci_id(data, 1)); 531 532 /* Set up resource regions */ 533 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME); 534 if (!reso) { 535 res = -EBUSY; 536 goto err; 537 } 538 539 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len); 540 if (!data->amb_mmio) { 541 res = -EBUSY; 542 goto err_map_failed; 543 } 544 545 platform_set_drvdata(pdev, data); 546 547 res = i5k_amb_hwmon_init(pdev); 548 if (res) 549 goto err_init_failed; 550 551 return res; 552 553 err_init_failed: 554 iounmap(data->amb_mmio); 555 platform_set_drvdata(pdev, NULL); 556 err_map_failed: 557 release_mem_region(data->amb_base, data->amb_len); 558 err: 559 kfree(data); 560 return res; 561 } 562 563 static int __devexit i5k_amb_remove(struct platform_device *pdev) 564 { 565 int i; 566 struct i5k_amb_data *data = platform_get_drvdata(pdev); 567 568 hwmon_device_unregister(data->hwmon_dev); 569 device_remove_file(&pdev->dev, &dev_attr_name); 570 for (i = 0; i < data->num_attrs; i++) 571 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); 572 kfree(data->attrs); 573 iounmap(data->amb_mmio); 574 release_mem_region(data->amb_base, data->amb_len); 575 platform_set_drvdata(pdev, NULL); 576 kfree(data); 577 return 0; 578 } 579 580 static struct platform_driver i5k_amb_driver = { 581 .driver = { 582 .owner = THIS_MODULE, 583 .name = DRVNAME, 584 }, 585 .probe = i5k_amb_probe, 586 .remove = __devexit_p(i5k_amb_remove), 587 }; 588 589 static int __init i5k_amb_init(void) 590 { 591 int res; 592 593 res = platform_driver_register(&i5k_amb_driver); 594 if (res) 595 return res; 596 597 res = i5k_amb_add(); 598 if (res) 599 platform_driver_unregister(&i5k_amb_driver); 600 601 return res; 602 } 603 604 static void __exit i5k_amb_exit(void) 605 { 606 platform_device_unregister(amb_pdev); 607 platform_driver_unregister(&i5k_amb_driver); 608 } 609 610 MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); 611 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor"); 612 MODULE_LICENSE("GPL"); 613 614 module_init(i5k_amb_init); 615 module_exit(i5k_amb_exit); 616