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 <darrick.wong@oracle.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/hwmon.h> 25 #include <linux/hwmon-sysfs.h> 26 #include <linux/err.h> 27 #include <linux/mutex.h> 28 #include <linux/log2.h> 29 #include <linux/pci.h> 30 #include <linux/platform_device.h> 31 #include <linux/slab.h> 32 33 #define DRVNAME "i5k_amb" 34 35 #define I5K_REG_AMB_BASE_ADDR 0x48 36 #define I5K_REG_AMB_LEN_ADDR 0x50 37 #define I5K_REG_CHAN0_PRESENCE_ADDR 0x64 38 #define I5K_REG_CHAN1_PRESENCE_ADDR 0x66 39 40 #define AMB_REG_TEMP_MIN_ADDR 0x80 41 #define AMB_REG_TEMP_MID_ADDR 0x81 42 #define AMB_REG_TEMP_MAX_ADDR 0x82 43 #define AMB_REG_TEMP_STATUS_ADDR 0x84 44 #define AMB_REG_TEMP_ADDR 0x85 45 46 #define AMB_CONFIG_SIZE 2048 47 #define AMB_FUNC_3_OFFSET 768 48 49 static unsigned long amb_reg_temp_status(unsigned int amb) 50 { 51 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR + 52 AMB_CONFIG_SIZE * amb; 53 } 54 55 static unsigned long amb_reg_temp_min(unsigned int amb) 56 { 57 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR + 58 AMB_CONFIG_SIZE * amb; 59 } 60 61 static unsigned long amb_reg_temp_mid(unsigned int amb) 62 { 63 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR + 64 AMB_CONFIG_SIZE * amb; 65 } 66 67 static unsigned long amb_reg_temp_max(unsigned int amb) 68 { 69 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR + 70 AMB_CONFIG_SIZE * amb; 71 } 72 73 static unsigned long amb_reg_temp(unsigned int amb) 74 { 75 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR + 76 AMB_CONFIG_SIZE * amb; 77 } 78 79 #define MAX_MEM_CHANNELS 4 80 #define MAX_AMBS_PER_CHANNEL 16 81 #define MAX_AMBS (MAX_MEM_CHANNELS * \ 82 MAX_AMBS_PER_CHANNEL) 83 #define CHANNEL_SHIFT 4 84 #define DIMM_MASK 0xF 85 /* 86 * Ugly hack: For some reason the highest bit is set if there 87 * are _any_ DIMMs in the channel. Attempting to read from 88 * this "high-order" AMB results in a memory bus error, so 89 * for now we'll just ignore that top bit, even though that 90 * might prevent us from seeing the 16th DIMM in the channel. 91 */ 92 #define REAL_MAX_AMBS_PER_CHANNEL 15 93 #define KNOBS_PER_AMB 6 94 95 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit) 96 { 97 return byte_num * MAX_AMBS_PER_CHANNEL + bit; 98 } 99 100 #define AMB_SYSFS_NAME_LEN 16 101 struct i5k_device_attribute { 102 struct sensor_device_attribute s_attr; 103 char name[AMB_SYSFS_NAME_LEN]; 104 }; 105 106 struct i5k_amb_data { 107 struct device *hwmon_dev; 108 109 unsigned long amb_base; 110 unsigned long amb_len; 111 u16 amb_present[MAX_MEM_CHANNELS]; 112 void __iomem *amb_mmio; 113 struct i5k_device_attribute *attrs; 114 unsigned int num_attrs; 115 }; 116 117 static ssize_t show_name(struct device *dev, struct device_attribute *devattr, 118 char *buf) 119 { 120 return sprintf(buf, "%s\n", DRVNAME); 121 } 122 123 124 static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 125 126 static struct platform_device *amb_pdev; 127 128 static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset) 129 { 130 return ioread8(data->amb_mmio + offset); 131 } 132 133 static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset, 134 u8 val) 135 { 136 iowrite8(val, data->amb_mmio + offset); 137 } 138 139 static ssize_t show_amb_alarm(struct device *dev, 140 struct device_attribute *devattr, 141 char *buf) 142 { 143 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 144 struct i5k_amb_data *data = dev_get_drvdata(dev); 145 146 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) && 147 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8)) 148 return sprintf(buf, "1\n"); 149 else 150 return sprintf(buf, "0\n"); 151 } 152 153 static ssize_t store_amb_min(struct device *dev, 154 struct device_attribute *devattr, 155 const char *buf, 156 size_t count) 157 { 158 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 159 struct i5k_amb_data *data = dev_get_drvdata(dev); 160 unsigned long temp; 161 int ret = kstrtoul(buf, 10, &temp); 162 if (ret < 0) 163 return ret; 164 165 temp = temp / 500; 166 if (temp > 255) 167 temp = 255; 168 169 amb_write_byte(data, amb_reg_temp_min(attr->index), temp); 170 return count; 171 } 172 173 static ssize_t store_amb_mid(struct device *dev, 174 struct device_attribute *devattr, 175 const char *buf, 176 size_t count) 177 { 178 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 179 struct i5k_amb_data *data = dev_get_drvdata(dev); 180 unsigned long temp; 181 int ret = kstrtoul(buf, 10, &temp); 182 if (ret < 0) 183 return ret; 184 185 temp = temp / 500; 186 if (temp > 255) 187 temp = 255; 188 189 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp); 190 return count; 191 } 192 193 static ssize_t store_amb_max(struct device *dev, 194 struct device_attribute *devattr, 195 const char *buf, 196 size_t count) 197 { 198 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 199 struct i5k_amb_data *data = dev_get_drvdata(dev); 200 unsigned long temp; 201 int ret = kstrtoul(buf, 10, &temp); 202 if (ret < 0) 203 return ret; 204 205 temp = temp / 500; 206 if (temp > 255) 207 temp = 255; 208 209 amb_write_byte(data, amb_reg_temp_max(attr->index), temp); 210 return count; 211 } 212 213 static ssize_t show_amb_min(struct device *dev, 214 struct device_attribute *devattr, 215 char *buf) 216 { 217 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 218 struct i5k_amb_data *data = dev_get_drvdata(dev); 219 return sprintf(buf, "%d\n", 220 500 * amb_read_byte(data, amb_reg_temp_min(attr->index))); 221 } 222 223 static ssize_t show_amb_mid(struct device *dev, 224 struct device_attribute *devattr, 225 char *buf) 226 { 227 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 228 struct i5k_amb_data *data = dev_get_drvdata(dev); 229 return sprintf(buf, "%d\n", 230 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index))); 231 } 232 233 static ssize_t show_amb_max(struct device *dev, 234 struct device_attribute *devattr, 235 char *buf) 236 { 237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 238 struct i5k_amb_data *data = dev_get_drvdata(dev); 239 return sprintf(buf, "%d\n", 240 500 * amb_read_byte(data, amb_reg_temp_max(attr->index))); 241 } 242 243 static ssize_t show_amb_temp(struct device *dev, 244 struct device_attribute *devattr, 245 char *buf) 246 { 247 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 248 struct i5k_amb_data *data = dev_get_drvdata(dev); 249 return sprintf(buf, "%d\n", 250 500 * amb_read_byte(data, amb_reg_temp(attr->index))); 251 } 252 253 static ssize_t show_label(struct device *dev, 254 struct device_attribute *devattr, 255 char *buf) 256 { 257 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); 258 259 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT, 260 attr->index & DIMM_MASK); 261 } 262 263 static int i5k_amb_hwmon_init(struct platform_device *pdev) 264 { 265 int i, j, k, d = 0; 266 u16 c; 267 int res = 0; 268 int num_ambs = 0; 269 struct i5k_amb_data *data = platform_get_drvdata(pdev); 270 271 /* Count the number of AMBs found */ 272 /* ignore the high-order bit, see "Ugly hack" comment above */ 273 for (i = 0; i < MAX_MEM_CHANNELS; i++) 274 num_ambs += hweight16(data->amb_present[i] & 0x7fff); 275 276 /* Set up sysfs stuff */ 277 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB, 278 GFP_KERNEL); 279 if (!data->attrs) 280 return -ENOMEM; 281 data->num_attrs = 0; 282 283 for (i = 0; i < MAX_MEM_CHANNELS; i++) { 284 c = data->amb_present[i]; 285 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) { 286 struct i5k_device_attribute *iattr; 287 288 k = amb_num_from_reg(i, j); 289 if (!(c & 0x1)) 290 continue; 291 d++; 292 293 /* sysfs label */ 294 iattr = data->attrs + data->num_attrs; 295 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 296 "temp%d_label", d); 297 iattr->s_attr.dev_attr.attr.name = iattr->name; 298 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 299 iattr->s_attr.dev_attr.show = show_label; 300 iattr->s_attr.index = k; 301 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 302 res = device_create_file(&pdev->dev, 303 &iattr->s_attr.dev_attr); 304 if (res) 305 goto exit_remove; 306 data->num_attrs++; 307 308 /* Temperature sysfs knob */ 309 iattr = data->attrs + data->num_attrs; 310 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 311 "temp%d_input", d); 312 iattr->s_attr.dev_attr.attr.name = iattr->name; 313 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 314 iattr->s_attr.dev_attr.show = show_amb_temp; 315 iattr->s_attr.index = k; 316 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 317 res = device_create_file(&pdev->dev, 318 &iattr->s_attr.dev_attr); 319 if (res) 320 goto exit_remove; 321 data->num_attrs++; 322 323 /* Temperature min sysfs knob */ 324 iattr = data->attrs + data->num_attrs; 325 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 326 "temp%d_min", d); 327 iattr->s_attr.dev_attr.attr.name = iattr->name; 328 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 329 iattr->s_attr.dev_attr.show = show_amb_min; 330 iattr->s_attr.dev_attr.store = store_amb_min; 331 iattr->s_attr.index = k; 332 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 333 res = device_create_file(&pdev->dev, 334 &iattr->s_attr.dev_attr); 335 if (res) 336 goto exit_remove; 337 data->num_attrs++; 338 339 /* Temperature mid sysfs knob */ 340 iattr = data->attrs + data->num_attrs; 341 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 342 "temp%d_mid", d); 343 iattr->s_attr.dev_attr.attr.name = iattr->name; 344 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 345 iattr->s_attr.dev_attr.show = show_amb_mid; 346 iattr->s_attr.dev_attr.store = store_amb_mid; 347 iattr->s_attr.index = k; 348 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 349 res = device_create_file(&pdev->dev, 350 &iattr->s_attr.dev_attr); 351 if (res) 352 goto exit_remove; 353 data->num_attrs++; 354 355 /* Temperature max sysfs knob */ 356 iattr = data->attrs + data->num_attrs; 357 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 358 "temp%d_max", d); 359 iattr->s_attr.dev_attr.attr.name = iattr->name; 360 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 361 iattr->s_attr.dev_attr.show = show_amb_max; 362 iattr->s_attr.dev_attr.store = store_amb_max; 363 iattr->s_attr.index = k; 364 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 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 /* Temperature alarm sysfs knob */ 372 iattr = data->attrs + data->num_attrs; 373 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 374 "temp%d_alarm", d); 375 iattr->s_attr.dev_attr.attr.name = iattr->name; 376 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 377 iattr->s_attr.dev_attr.show = show_amb_alarm; 378 iattr->s_attr.index = k; 379 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 380 res = device_create_file(&pdev->dev, 381 &iattr->s_attr.dev_attr); 382 if (res) 383 goto exit_remove; 384 data->num_attrs++; 385 } 386 } 387 388 res = device_create_file(&pdev->dev, &dev_attr_name); 389 if (res) 390 goto exit_remove; 391 392 data->hwmon_dev = hwmon_device_register(&pdev->dev); 393 if (IS_ERR(data->hwmon_dev)) { 394 res = PTR_ERR(data->hwmon_dev); 395 goto exit_remove; 396 } 397 398 return res; 399 400 exit_remove: 401 device_remove_file(&pdev->dev, &dev_attr_name); 402 for (i = 0; i < data->num_attrs; i++) 403 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); 404 kfree(data->attrs); 405 406 return res; 407 } 408 409 static int i5k_amb_add(void) 410 { 411 int res = -ENODEV; 412 413 /* only ever going to be one of these */ 414 amb_pdev = platform_device_alloc(DRVNAME, 0); 415 if (!amb_pdev) 416 return -ENOMEM; 417 418 res = platform_device_add(amb_pdev); 419 if (res) 420 goto err; 421 return 0; 422 423 err: 424 platform_device_put(amb_pdev); 425 return res; 426 } 427 428 static int i5k_find_amb_registers(struct i5k_amb_data *data, 429 unsigned long devid) 430 { 431 struct pci_dev *pcidev; 432 u32 val32; 433 int res = -ENODEV; 434 435 /* Find AMB register memory space */ 436 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, 437 devid, 438 NULL); 439 if (!pcidev) 440 return -ENODEV; 441 442 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32)) 443 goto out; 444 data->amb_base = val32; 445 446 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32)) 447 goto out; 448 data->amb_len = val32; 449 450 /* Is it big enough? */ 451 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) { 452 dev_err(&pcidev->dev, "AMB region too small!\n"); 453 goto out; 454 } 455 456 res = 0; 457 out: 458 pci_dev_put(pcidev); 459 return res; 460 } 461 462 static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id) 463 { 464 struct pci_dev *pcidev; 465 u16 val16; 466 int res = -ENODEV; 467 468 /* Copy the DIMM presence map for these two channels */ 469 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL); 470 if (!pcidev) 471 return -ENODEV; 472 473 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16)) 474 goto out; 475 amb_present[0] = val16; 476 477 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16)) 478 goto out; 479 amb_present[1] = val16; 480 481 res = 0; 482 483 out: 484 pci_dev_put(pcidev); 485 return res; 486 } 487 488 static struct { 489 unsigned long err; 490 unsigned long fbd0; 491 } chipset_ids[] = { 492 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 }, 493 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 }, 494 { 0, 0 } 495 }; 496 497 #ifdef MODULE 498 static struct pci_device_id i5k_amb_ids[] = { 499 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) }, 500 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) }, 501 { 0, } 502 }; 503 MODULE_DEVICE_TABLE(pci, i5k_amb_ids); 504 #endif 505 506 static int i5k_amb_probe(struct platform_device *pdev) 507 { 508 struct i5k_amb_data *data; 509 struct resource *reso; 510 int i, res; 511 512 data = kzalloc(sizeof(*data), GFP_KERNEL); 513 if (!data) 514 return -ENOMEM; 515 516 /* Figure out where the AMB registers live */ 517 i = 0; 518 do { 519 res = i5k_find_amb_registers(data, chipset_ids[i].err); 520 if (res == 0) 521 break; 522 i++; 523 } while (chipset_ids[i].err); 524 525 if (res) 526 goto err; 527 528 /* Copy the DIMM presence map for the first two channels */ 529 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0); 530 if (res) 531 goto err; 532 533 /* Copy the DIMM presence map for the optional second two channels */ 534 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1); 535 536 /* Set up resource regions */ 537 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME); 538 if (!reso) { 539 res = -EBUSY; 540 goto err; 541 } 542 543 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len); 544 if (!data->amb_mmio) { 545 res = -EBUSY; 546 goto err_map_failed; 547 } 548 549 platform_set_drvdata(pdev, data); 550 551 res = i5k_amb_hwmon_init(pdev); 552 if (res) 553 goto err_init_failed; 554 555 return res; 556 557 err_init_failed: 558 iounmap(data->amb_mmio); 559 err_map_failed: 560 release_mem_region(data->amb_base, data->amb_len); 561 err: 562 kfree(data); 563 return res; 564 } 565 566 static int i5k_amb_remove(struct platform_device *pdev) 567 { 568 int i; 569 struct i5k_amb_data *data = platform_get_drvdata(pdev); 570 571 hwmon_device_unregister(data->hwmon_dev); 572 device_remove_file(&pdev->dev, &dev_attr_name); 573 for (i = 0; i < data->num_attrs; i++) 574 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); 575 kfree(data->attrs); 576 iounmap(data->amb_mmio); 577 release_mem_region(data->amb_base, data->amb_len); 578 kfree(data); 579 return 0; 580 } 581 582 static struct platform_driver i5k_amb_driver = { 583 .driver = { 584 .owner = THIS_MODULE, 585 .name = DRVNAME, 586 }, 587 .probe = i5k_amb_probe, 588 .remove = i5k_amb_remove, 589 }; 590 591 static int __init i5k_amb_init(void) 592 { 593 int res; 594 595 res = platform_driver_register(&i5k_amb_driver); 596 if (res) 597 return res; 598 599 res = i5k_amb_add(); 600 if (res) 601 platform_driver_unregister(&i5k_amb_driver); 602 603 return res; 604 } 605 606 static void __exit i5k_amb_exit(void) 607 { 608 platform_device_unregister(amb_pdev); 609 platform_driver_unregister(&i5k_amb_driver); 610 } 611 612 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>"); 613 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor"); 614 MODULE_LICENSE("GPL"); 615 616 module_init(i5k_amb_init); 617 module_exit(i5k_amb_exit); 618