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