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 51static 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 57static 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 63static 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 69static 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 75static 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 97static 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 103struct i5k_device_attribute { 104 struct sensor_device_attribute s_attr; 105 char name[AMB_SYSFS_NAME_LEN]; 106}; 107 108struct 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 120static 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 127static DEVICE_ATTR(name, S_IRUGO, show_name, NULL); 128 129static struct platform_device *amb_pdev; 130 131static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset) 132{ 133 return ioread8(data->amb_mmio + offset); 134} 135 136static 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 142static 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 156static 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 172static 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 188static 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 204static 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 214static 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 224static 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 234static 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 244static 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 254static 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 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 293 res = device_create_file(&pdev->dev, 294 &iattr->s_attr.dev_attr); 295 if (res) 296 goto exit_remove; 297 data->num_attrs++; 298 299 /* Temperature sysfs knob */ 300 iattr = data->attrs + data->num_attrs; 301 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 302 "temp%d_input", d); 303 iattr->s_attr.dev_attr.attr.name = iattr->name; 304 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 305 iattr->s_attr.dev_attr.show = show_amb_temp; 306 iattr->s_attr.index = k; 307 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 308 res = device_create_file(&pdev->dev, 309 &iattr->s_attr.dev_attr); 310 if (res) 311 goto exit_remove; 312 data->num_attrs++; 313 314 /* Temperature min sysfs knob */ 315 iattr = data->attrs + data->num_attrs; 316 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 317 "temp%d_min", d); 318 iattr->s_attr.dev_attr.attr.name = iattr->name; 319 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 320 iattr->s_attr.dev_attr.show = show_amb_min; 321 iattr->s_attr.dev_attr.store = store_amb_min; 322 iattr->s_attr.index = k; 323 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 324 res = device_create_file(&pdev->dev, 325 &iattr->s_attr.dev_attr); 326 if (res) 327 goto exit_remove; 328 data->num_attrs++; 329 330 /* Temperature mid sysfs knob */ 331 iattr = data->attrs + data->num_attrs; 332 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 333 "temp%d_mid", d); 334 iattr->s_attr.dev_attr.attr.name = iattr->name; 335 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 336 iattr->s_attr.dev_attr.show = show_amb_mid; 337 iattr->s_attr.dev_attr.store = store_amb_mid; 338 iattr->s_attr.index = k; 339 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 340 res = device_create_file(&pdev->dev, 341 &iattr->s_attr.dev_attr); 342 if (res) 343 goto exit_remove; 344 data->num_attrs++; 345 346 /* Temperature max sysfs knob */ 347 iattr = data->attrs + data->num_attrs; 348 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 349 "temp%d_max", d); 350 iattr->s_attr.dev_attr.attr.name = iattr->name; 351 iattr->s_attr.dev_attr.attr.mode = S_IWUSR | S_IRUGO; 352 iattr->s_attr.dev_attr.show = show_amb_max; 353 iattr->s_attr.dev_attr.store = store_amb_max; 354 iattr->s_attr.index = k; 355 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 356 res = device_create_file(&pdev->dev, 357 &iattr->s_attr.dev_attr); 358 if (res) 359 goto exit_remove; 360 data->num_attrs++; 361 362 /* Temperature alarm sysfs knob */ 363 iattr = data->attrs + data->num_attrs; 364 snprintf(iattr->name, AMB_SYSFS_NAME_LEN, 365 "temp%d_alarm", d); 366 iattr->s_attr.dev_attr.attr.name = iattr->name; 367 iattr->s_attr.dev_attr.attr.mode = S_IRUGO; 368 iattr->s_attr.dev_attr.show = show_amb_alarm; 369 iattr->s_attr.index = k; 370 sysfs_attr_init(&iattr->s_attr.dev_attr.attr); 371 res = device_create_file(&pdev->dev, 372 &iattr->s_attr.dev_attr); 373 if (res) 374 goto exit_remove; 375 data->num_attrs++; 376 } 377 } 378 379 res = device_create_file(&pdev->dev, &dev_attr_name); 380 if (res) 381 goto exit_remove; 382 383 data->hwmon_dev = hwmon_device_register(&pdev->dev); 384 if (IS_ERR(data->hwmon_dev)) { 385 res = PTR_ERR(data->hwmon_dev); 386 goto exit_remove; 387 } 388 389 return res; 390 391exit_remove: 392 device_remove_file(&pdev->dev, &dev_attr_name); 393 for (i = 0; i < data->num_attrs; i++) 394 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); 395 kfree(data->attrs); 396 397 return res; 398} 399 400static int __devinit i5k_amb_add(void) 401{ 402 int res = -ENODEV; 403 404 /* only ever going to be one of these */ 405 amb_pdev = platform_device_alloc(DRVNAME, 0); 406 if (!amb_pdev) 407 return -ENOMEM; 408 409 res = platform_device_add(amb_pdev); 410 if (res) 411 goto err; 412 return 0; 413 414err: 415 platform_device_put(amb_pdev); 416 return res; 417} 418 419static int __devinit i5k_find_amb_registers(struct i5k_amb_data *data, 420 unsigned long devid) 421{ 422 struct pci_dev *pcidev; 423 u32 val32; 424 int res = -ENODEV; 425 426 /* Find AMB register memory space */ 427 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, 428 devid, 429 NULL); 430 if (!pcidev) 431 return -ENODEV; 432 433 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32)) 434 goto out; 435 data->amb_base = val32; 436 437 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32)) 438 goto out; 439 data->amb_len = val32; 440 441 /* Is it big enough? */ 442 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) { 443 dev_err(&pcidev->dev, "AMB region too small!\n"); 444 goto out; 445 } 446 447 data->chipset_id = devid; 448 449 res = 0; 450out: 451 pci_dev_put(pcidev); 452 return res; 453} 454 455static int __devinit i5k_channel_probe(u16 *amb_present, unsigned long dev_id) 456{ 457 struct pci_dev *pcidev; 458 u16 val16; 459 int res = -ENODEV; 460 461 /* Copy the DIMM presence map for these two channels */ 462 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL); 463 if (!pcidev) 464 return -ENODEV; 465 466 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16)) 467 goto out; 468 amb_present[0] = val16; 469 470 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16)) 471 goto out; 472 amb_present[1] = val16; 473 474 res = 0; 475 476out: 477 pci_dev_put(pcidev); 478 return res; 479} 480 481static unsigned long i5k_channel_pci_id(struct i5k_amb_data *data, 482 unsigned long channel) 483{ 484 switch (data->chipset_id) { 485 case PCI_DEVICE_ID_INTEL_5000_ERR: 486 return PCI_DEVICE_ID_INTEL_5000_FBD0 + channel; 487 case PCI_DEVICE_ID_INTEL_5400_ERR: 488 return PCI_DEVICE_ID_INTEL_5400_FBD0 + channel; 489 default: 490 BUG(); 491 } 492} 493 494static unsigned long chipset_ids[] = { 495 PCI_DEVICE_ID_INTEL_5000_ERR, 496 PCI_DEVICE_ID_INTEL_5400_ERR, 497 0 498}; 499 500static struct pci_device_id i5k_amb_ids[] __devinitdata = { 501 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) }, 502 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) }, 503 { 0, } 504}; 505MODULE_DEVICE_TABLE(pci, i5k_amb_ids); 506 507static int __devinit i5k_amb_probe(struct platform_device *pdev) 508{ 509 struct i5k_amb_data *data; 510 struct resource *reso; 511 int i; 512 int res = -ENODEV; 513 514 data = kzalloc(sizeof(*data), GFP_KERNEL); 515 if (!data) 516 return -ENOMEM; 517 518 /* Figure out where the AMB registers live */ 519 i = 0; 520 do { 521 res = i5k_find_amb_registers(data, chipset_ids[i]); 522 i++; 523 } while (res && chipset_ids[i]); 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], 530 i5k_channel_pci_id(data, 0)); 531 if (res) 532 goto err; 533 534 /* Copy the DIMM presence map for the optional second two channels */ 535 i5k_channel_probe(&data->amb_present[2], 536 i5k_channel_pci_id(data, 1)); 537 538 /* Set up resource regions */ 539 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME); 540 if (!reso) { 541 res = -EBUSY; 542 goto err; 543 } 544 545 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len); 546 if (!data->amb_mmio) { 547 res = -EBUSY; 548 goto err_map_failed; 549 } 550 551 platform_set_drvdata(pdev, data); 552 553 res = i5k_amb_hwmon_init(pdev); 554 if (res) 555 goto err_init_failed; 556 557 return res; 558 559err_init_failed: 560 iounmap(data->amb_mmio); 561 platform_set_drvdata(pdev, NULL); 562err_map_failed: 563 release_mem_region(data->amb_base, data->amb_len); 564err: 565 kfree(data); 566 return res; 567} 568 569static int __devexit i5k_amb_remove(struct platform_device *pdev) 570{ 571 int i; 572 struct i5k_amb_data *data = platform_get_drvdata(pdev); 573 574 hwmon_device_unregister(data->hwmon_dev); 575 device_remove_file(&pdev->dev, &dev_attr_name); 576 for (i = 0; i < data->num_attrs; i++) 577 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); 578 kfree(data->attrs); 579 iounmap(data->amb_mmio); 580 release_mem_region(data->amb_base, data->amb_len); 581 platform_set_drvdata(pdev, NULL); 582 kfree(data); 583 return 0; 584} 585 586static struct platform_driver i5k_amb_driver = { 587 .driver = { 588 .owner = THIS_MODULE, 589 .name = DRVNAME, 590 }, 591 .probe = i5k_amb_probe, 592 .remove = __devexit_p(i5k_amb_remove), 593}; 594 595static int __init i5k_amb_init(void) 596{ 597 int res; 598 599 res = platform_driver_register(&i5k_amb_driver); 600 if (res) 601 return res; 602 603 res = i5k_amb_add(); 604 if (res) 605 platform_driver_unregister(&i5k_amb_driver); 606 607 return res; 608} 609 610static void __exit i5k_amb_exit(void) 611{ 612 platform_device_unregister(amb_pdev); 613 platform_driver_unregister(&i5k_amb_driver); 614} 615 616MODULE_AUTHOR("Darrick J. Wong <djwong@us.ibm.com>"); 617MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor"); 618MODULE_LICENSE("GPL"); 619 620module_init(i5k_amb_init); 621module_exit(i5k_amb_exit); 622