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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB4 * temperature sensors5 * Copyright (C) 2007 IBM6 *7 * Author: Darrick J. Wong <darrick.wong@oracle.com>8 */9 10#include <linux/module.h>11#include <linux/hwmon.h>12#include <linux/hwmon-sysfs.h>13#include <linux/err.h>14#include <linux/mutex.h>15#include <linux/log2.h>16#include <linux/pci.h>17#include <linux/platform_device.h>18#include <linux/slab.h>19 20#define DRVNAME "i5k_amb"21 22#define I5K_REG_AMB_BASE_ADDR 0x4823#define I5K_REG_AMB_LEN_ADDR 0x5024#define I5K_REG_CHAN0_PRESENCE_ADDR 0x6425#define I5K_REG_CHAN1_PRESENCE_ADDR 0x6626 27#define AMB_REG_TEMP_MIN_ADDR 0x8028#define AMB_REG_TEMP_MID_ADDR 0x8129#define AMB_REG_TEMP_MAX_ADDR 0x8230#define AMB_REG_TEMP_STATUS_ADDR 0x8431#define AMB_REG_TEMP_ADDR 0x8532 33#define AMB_CONFIG_SIZE 204834#define AMB_FUNC_3_OFFSET 76835 36static unsigned long amb_reg_temp_status(unsigned int amb)37{38 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +39 AMB_CONFIG_SIZE * amb;40}41 42static unsigned long amb_reg_temp_min(unsigned int amb)43{44 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +45 AMB_CONFIG_SIZE * amb;46}47 48static unsigned long amb_reg_temp_mid(unsigned int amb)49{50 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +51 AMB_CONFIG_SIZE * amb;52}53 54static unsigned long amb_reg_temp_max(unsigned int amb)55{56 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +57 AMB_CONFIG_SIZE * amb;58}59 60static unsigned long amb_reg_temp(unsigned int amb)61{62 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +63 AMB_CONFIG_SIZE * amb;64}65 66#define MAX_MEM_CHANNELS 467#define MAX_AMBS_PER_CHANNEL 1668#define MAX_AMBS (MAX_MEM_CHANNELS * \69 MAX_AMBS_PER_CHANNEL)70#define CHANNEL_SHIFT 471#define DIMM_MASK 0xF72/*73 * Ugly hack: For some reason the highest bit is set if there74 * are _any_ DIMMs in the channel. Attempting to read from75 * this "high-order" AMB results in a memory bus error, so76 * for now we'll just ignore that top bit, even though that77 * might prevent us from seeing the 16th DIMM in the channel.78 */79#define REAL_MAX_AMBS_PER_CHANNEL 1580#define KNOBS_PER_AMB 681 82static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)83{84 return byte_num * MAX_AMBS_PER_CHANNEL + bit;85}86 87#define AMB_SYSFS_NAME_LEN 1688struct i5k_device_attribute {89 struct sensor_device_attribute s_attr;90 char name[AMB_SYSFS_NAME_LEN];91};92 93struct i5k_amb_data {94 struct device *hwmon_dev;95 96 unsigned long amb_base;97 unsigned long amb_len;98 u16 amb_present[MAX_MEM_CHANNELS];99 void __iomem *amb_mmio;100 struct i5k_device_attribute *attrs;101 unsigned int num_attrs;102};103 104static DEVICE_STRING_ATTR_RO(name, 0444, DRVNAME);105 106static struct platform_device *amb_pdev;107 108static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)109{110 return ioread8(data->amb_mmio + offset);111}112 113static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,114 u8 val)115{116 iowrite8(val, data->amb_mmio + offset);117}118 119static ssize_t show_amb_alarm(struct device *dev,120 struct device_attribute *devattr,121 char *buf)122{123 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);124 struct i5k_amb_data *data = dev_get_drvdata(dev);125 126 if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&127 (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))128 return sprintf(buf, "1\n");129 else130 return sprintf(buf, "0\n");131}132 133static ssize_t store_amb_min(struct device *dev,134 struct device_attribute *devattr,135 const char *buf,136 size_t count)137{138 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);139 struct i5k_amb_data *data = dev_get_drvdata(dev);140 unsigned long temp;141 int ret = kstrtoul(buf, 10, &temp);142 if (ret < 0)143 return ret;144 145 temp = temp / 500;146 if (temp > 255)147 temp = 255;148 149 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);150 return count;151}152 153static ssize_t store_amb_mid(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_mid(attr->index), temp);170 return count;171}172 173static ssize_t store_amb_max(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_max(attr->index), temp);190 return count;191}192 193static ssize_t show_amb_min(struct device *dev,194 struct device_attribute *devattr,195 char *buf)196{197 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);198 struct i5k_amb_data *data = dev_get_drvdata(dev);199 return sprintf(buf, "%d\n",200 500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));201}202 203static ssize_t show_amb_mid(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_mid(attr->index)));211}212 213static ssize_t show_amb_max(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_max(attr->index)));221}222 223static ssize_t show_amb_temp(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(attr->index)));231}232 233static ssize_t show_label(struct device *dev,234 struct device_attribute *devattr,235 char *buf)236{237 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);238 239 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,240 attr->index & DIMM_MASK);241}242 243static int i5k_amb_hwmon_init(struct platform_device *pdev)244{245 int i, j, k, d = 0;246 u16 c;247 int res = 0;248 int num_ambs = 0;249 struct i5k_amb_data *data = platform_get_drvdata(pdev);250 251 /* Count the number of AMBs found */252 /* ignore the high-order bit, see "Ugly hack" comment above */253 for (i = 0; i < MAX_MEM_CHANNELS; i++)254 num_ambs += hweight16(data->amb_present[i] & 0x7fff);255 256 /* Set up sysfs stuff */257 data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,258 sizeof(*data->attrs)),259 GFP_KERNEL);260 if (!data->attrs)261 return -ENOMEM;262 data->num_attrs = 0;263 264 for (i = 0; i < MAX_MEM_CHANNELS; i++) {265 c = data->amb_present[i];266 for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {267 struct i5k_device_attribute *iattr;268 269 k = amb_num_from_reg(i, j);270 if (!(c & 0x1))271 continue;272 d++;273 274 /* sysfs label */275 iattr = data->attrs + data->num_attrs;276 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,277 "temp%d_label", d);278 iattr->s_attr.dev_attr.attr.name = iattr->name;279 iattr->s_attr.dev_attr.attr.mode = 0444;280 iattr->s_attr.dev_attr.show = show_label;281 iattr->s_attr.index = k;282 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);283 res = device_create_file(&pdev->dev,284 &iattr->s_attr.dev_attr);285 if (res)286 goto exit_remove;287 data->num_attrs++;288 289 /* Temperature sysfs knob */290 iattr = data->attrs + data->num_attrs;291 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,292 "temp%d_input", d);293 iattr->s_attr.dev_attr.attr.name = iattr->name;294 iattr->s_attr.dev_attr.attr.mode = 0444;295 iattr->s_attr.dev_attr.show = show_amb_temp;296 iattr->s_attr.index = k;297 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);298 res = device_create_file(&pdev->dev,299 &iattr->s_attr.dev_attr);300 if (res)301 goto exit_remove;302 data->num_attrs++;303 304 /* Temperature min sysfs knob */305 iattr = data->attrs + data->num_attrs;306 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,307 "temp%d_min", d);308 iattr->s_attr.dev_attr.attr.name = iattr->name;309 iattr->s_attr.dev_attr.attr.mode = 0644;310 iattr->s_attr.dev_attr.show = show_amb_min;311 iattr->s_attr.dev_attr.store = store_amb_min;312 iattr->s_attr.index = k;313 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);314 res = device_create_file(&pdev->dev,315 &iattr->s_attr.dev_attr);316 if (res)317 goto exit_remove;318 data->num_attrs++;319 320 /* Temperature mid sysfs knob */321 iattr = data->attrs + data->num_attrs;322 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,323 "temp%d_mid", d);324 iattr->s_attr.dev_attr.attr.name = iattr->name;325 iattr->s_attr.dev_attr.attr.mode = 0644;326 iattr->s_attr.dev_attr.show = show_amb_mid;327 iattr->s_attr.dev_attr.store = store_amb_mid;328 iattr->s_attr.index = k;329 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);330 res = device_create_file(&pdev->dev,331 &iattr->s_attr.dev_attr);332 if (res)333 goto exit_remove;334 data->num_attrs++;335 336 /* Temperature max sysfs knob */337 iattr = data->attrs + data->num_attrs;338 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,339 "temp%d_max", d);340 iattr->s_attr.dev_attr.attr.name = iattr->name;341 iattr->s_attr.dev_attr.attr.mode = 0644;342 iattr->s_attr.dev_attr.show = show_amb_max;343 iattr->s_attr.dev_attr.store = store_amb_max;344 iattr->s_attr.index = k;345 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);346 res = device_create_file(&pdev->dev,347 &iattr->s_attr.dev_attr);348 if (res)349 goto exit_remove;350 data->num_attrs++;351 352 /* Temperature alarm sysfs knob */353 iattr = data->attrs + data->num_attrs;354 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,355 "temp%d_alarm", d);356 iattr->s_attr.dev_attr.attr.name = iattr->name;357 iattr->s_attr.dev_attr.attr.mode = 0444;358 iattr->s_attr.dev_attr.show = show_amb_alarm;359 iattr->s_attr.index = k;360 sysfs_attr_init(&iattr->s_attr.dev_attr.attr);361 res = device_create_file(&pdev->dev,362 &iattr->s_attr.dev_attr);363 if (res)364 goto exit_remove;365 data->num_attrs++;366 }367 }368 369 res = device_create_file(&pdev->dev, &dev_attr_name.attr);370 if (res)371 goto exit_remove;372 373 data->hwmon_dev = hwmon_device_register(&pdev->dev);374 if (IS_ERR(data->hwmon_dev)) {375 res = PTR_ERR(data->hwmon_dev);376 goto exit_remove;377 }378 379 return res;380 381exit_remove:382 device_remove_file(&pdev->dev, &dev_attr_name.attr);383 for (i = 0; i < data->num_attrs; i++)384 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);385 kfree(data->attrs);386 387 return res;388}389 390static int i5k_amb_add(void)391{392 int res;393 394 /* only ever going to be one of these */395 amb_pdev = platform_device_alloc(DRVNAME, 0);396 if (!amb_pdev)397 return -ENOMEM;398 399 res = platform_device_add(amb_pdev);400 if (res)401 goto err;402 return 0;403 404err:405 platform_device_put(amb_pdev);406 return res;407}408 409static int i5k_find_amb_registers(struct i5k_amb_data *data,410 unsigned long devid)411{412 struct pci_dev *pcidev;413 u32 val32;414 int res = -ENODEV;415 416 /* Find AMB register memory space */417 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,418 devid,419 NULL);420 if (!pcidev)421 return -ENODEV;422 423 pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32);424 if (val32 == (u32)~0)425 goto out;426 data->amb_base = val32;427 428 pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32);429 if (val32 == (u32)~0)430 goto out;431 data->amb_len = val32;432 433 /* Is it big enough? */434 if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {435 dev_err(&pcidev->dev, "AMB region too small!\n");436 goto out;437 }438 439 res = 0;440out:441 pci_dev_put(pcidev);442 return res;443}444 445static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)446{447 struct pci_dev *pcidev;448 u16 val16;449 int res = -ENODEV;450 451 /* Copy the DIMM presence map for these two channels */452 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);453 if (!pcidev)454 return -ENODEV;455 456 pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16);457 if (val16 == (u16)~0)458 goto out;459 amb_present[0] = val16;460 461 pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16);462 if (val16 == (u16)~0)463 goto out;464 amb_present[1] = val16;465 466 res = 0;467 468out:469 pci_dev_put(pcidev);470 return res;471}472 473static struct {474 unsigned long err;475 unsigned long fbd0;476} chipset_ids[] = {477 { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },478 { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },479 { 0, 0 }480};481 482#ifdef MODULE483static const struct pci_device_id i5k_amb_ids[] = {484 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },485 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },486 { 0, }487};488MODULE_DEVICE_TABLE(pci, i5k_amb_ids);489#endif490 491static int i5k_amb_probe(struct platform_device *pdev)492{493 struct i5k_amb_data *data;494 struct resource *reso;495 int i, res;496 497 data = kzalloc(sizeof(*data), GFP_KERNEL);498 if (!data)499 return -ENOMEM;500 501 /* Figure out where the AMB registers live */502 i = 0;503 do {504 res = i5k_find_amb_registers(data, chipset_ids[i].err);505 if (res == 0)506 break;507 i++;508 } while (chipset_ids[i].err);509 510 if (res)511 goto err;512 513 /* Copy the DIMM presence map for the first two channels */514 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);515 if (res)516 goto err;517 518 /* Copy the DIMM presence map for the optional second two channels */519 i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);520 521 /* Set up resource regions */522 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);523 if (!reso) {524 res = -EBUSY;525 goto err;526 }527 528 data->amb_mmio = ioremap(data->amb_base, data->amb_len);529 if (!data->amb_mmio) {530 res = -EBUSY;531 goto err_map_failed;532 }533 534 platform_set_drvdata(pdev, data);535 536 res = i5k_amb_hwmon_init(pdev);537 if (res)538 goto err_init_failed;539 540 return res;541 542err_init_failed:543 iounmap(data->amb_mmio);544err_map_failed:545 release_mem_region(data->amb_base, data->amb_len);546err:547 kfree(data);548 return res;549}550 551static void i5k_amb_remove(struct platform_device *pdev)552{553 int i;554 struct i5k_amb_data *data = platform_get_drvdata(pdev);555 556 hwmon_device_unregister(data->hwmon_dev);557 device_remove_file(&pdev->dev, &dev_attr_name.attr);558 for (i = 0; i < data->num_attrs; i++)559 device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);560 kfree(data->attrs);561 iounmap(data->amb_mmio);562 release_mem_region(data->amb_base, data->amb_len);563 kfree(data);564}565 566static struct platform_driver i5k_amb_driver = {567 .driver = {568 .name = DRVNAME,569 },570 .probe = i5k_amb_probe,571 .remove_new = i5k_amb_remove,572};573 574static int __init i5k_amb_init(void)575{576 int res;577 578 res = platform_driver_register(&i5k_amb_driver);579 if (res)580 return res;581 582 res = i5k_amb_add();583 if (res)584 platform_driver_unregister(&i5k_amb_driver);585 586 return res;587}588 589static void __exit i5k_amb_exit(void)590{591 platform_device_unregister(amb_pdev);592 platform_driver_unregister(&i5k_amb_driver);593}594 595MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");596MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");597MODULE_LICENSE("GPL");598 599module_init(i5k_amb_init);600module_exit(i5k_amb_exit);601