2 * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
4 * Copyright (C) 2007 IBM
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.
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.
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
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>
33 #define DRVNAME "i5k_amb"
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
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
46 #define AMB_CONFIG_SIZE 2048
47 #define AMB_FUNC_3_OFFSET 768
49 static unsigned long amb_reg_temp_status(unsigned int amb)
51 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
52 AMB_CONFIG_SIZE * amb;
55 static unsigned long amb_reg_temp_min(unsigned int amb)
57 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
58 AMB_CONFIG_SIZE * amb;
61 static unsigned long amb_reg_temp_mid(unsigned int amb)
63 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
64 AMB_CONFIG_SIZE * amb;
67 static unsigned long amb_reg_temp_max(unsigned int amb)
69 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
70 AMB_CONFIG_SIZE * amb;
73 static unsigned long amb_reg_temp(unsigned int amb)
75 return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
76 AMB_CONFIG_SIZE * amb;
79 #define MAX_MEM_CHANNELS 4
80 #define MAX_AMBS_PER_CHANNEL 16
81 #define MAX_AMBS (MAX_MEM_CHANNELS * \
83 #define CHANNEL_SHIFT 4
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.
92 #define REAL_MAX_AMBS_PER_CHANNEL 15
93 #define KNOBS_PER_AMB 6
95 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
97 return byte_num * MAX_AMBS_PER_CHANNEL + bit;
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];
106 struct i5k_amb_data {
107 struct device *hwmon_dev;
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;
117 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
120 return sprintf(buf, "%s\n", DRVNAME);
124 static DEVICE_ATTR_RO(name);
126 static struct platform_device *amb_pdev;
128 static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
130 return ioread8(data->amb_mmio + offset);
133 static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
136 iowrite8(val, data->amb_mmio + offset);
139 static ssize_t show_amb_alarm(struct device *dev,
140 struct device_attribute *devattr,
143 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
144 struct i5k_amb_data *data = dev_get_drvdata(dev);
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");
150 return sprintf(buf, "0\n");
153 static ssize_t store_amb_min(struct device *dev,
154 struct device_attribute *devattr,
158 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
159 struct i5k_amb_data *data = dev_get_drvdata(dev);
161 int ret = kstrtoul(buf, 10, &temp);
169 amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
173 static ssize_t store_amb_mid(struct device *dev,
174 struct device_attribute *devattr,
178 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
179 struct i5k_amb_data *data = dev_get_drvdata(dev);
181 int ret = kstrtoul(buf, 10, &temp);
189 amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
193 static ssize_t store_amb_max(struct device *dev,
194 struct device_attribute *devattr,
198 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
199 struct i5k_amb_data *data = dev_get_drvdata(dev);
201 int ret = kstrtoul(buf, 10, &temp);
209 amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
213 static ssize_t show_amb_min(struct device *dev,
214 struct device_attribute *devattr,
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)));
223 static ssize_t show_amb_mid(struct device *dev,
224 struct device_attribute *devattr,
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)));
233 static ssize_t show_amb_max(struct device *dev,
234 struct device_attribute *devattr,
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)));
243 static ssize_t show_amb_temp(struct device *dev,
244 struct device_attribute *devattr,
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)));
253 static ssize_t show_label(struct device *dev,
254 struct device_attribute *devattr,
257 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
259 return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
260 attr->index & DIMM_MASK);
263 static int i5k_amb_hwmon_init(struct platform_device *pdev)
269 struct i5k_amb_data *data = platform_get_drvdata(pdev);
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);
276 /* Set up sysfs stuff */
277 data->attrs = kzalloc(sizeof(*data->attrs) * num_ambs * KNOBS_PER_AMB,
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;
288 k = amb_num_from_reg(i, j);
294 iattr = data->attrs + data->num_attrs;
295 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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);
308 /* Temperature sysfs knob */
309 iattr = data->attrs + data->num_attrs;
310 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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);
323 /* Temperature min sysfs knob */
324 iattr = data->attrs + data->num_attrs;
325 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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);
339 /* Temperature mid sysfs knob */
340 iattr = data->attrs + data->num_attrs;
341 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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);
355 /* Temperature max sysfs knob */
356 iattr = data->attrs + data->num_attrs;
357 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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);
371 /* Temperature alarm sysfs knob */
372 iattr = data->attrs + data->num_attrs;
373 snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
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);
388 res = device_create_file(&pdev->dev, &dev_attr_name);
392 data->hwmon_dev = hwmon_device_register(&pdev->dev);
393 if (IS_ERR(data->hwmon_dev)) {
394 res = PTR_ERR(data->hwmon_dev);
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);
409 static int i5k_amb_add(void)
413 /* only ever going to be one of these */
414 amb_pdev = platform_device_alloc(DRVNAME, 0);
418 res = platform_device_add(amb_pdev);
424 platform_device_put(amb_pdev);
428 static int i5k_find_amb_registers(struct i5k_amb_data *data,
431 struct pci_dev *pcidev;
435 /* Find AMB register memory space */
436 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
442 if (pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32))
444 data->amb_base = val32;
446 if (pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32))
448 data->amb_len = val32;
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");
462 static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
464 struct pci_dev *pcidev;
468 /* Copy the DIMM presence map for these two channels */
469 pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
473 if (pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16))
475 amb_present[0] = val16;
477 if (pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16))
479 amb_present[1] = val16;
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 },
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) },
503 MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
506 static int i5k_amb_probe(struct platform_device *pdev)
508 struct i5k_amb_data *data;
509 struct resource *reso;
512 data = kzalloc(sizeof(*data), GFP_KERNEL);
516 /* Figure out where the AMB registers live */
519 res = i5k_find_amb_registers(data, chipset_ids[i].err);
523 } while (chipset_ids[i].err);
528 /* Copy the DIMM presence map for the first two channels */
529 res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
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);
536 /* Set up resource regions */
537 reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
543 data->amb_mmio = ioremap_nocache(data->amb_base, data->amb_len);
544 if (!data->amb_mmio) {
549 platform_set_drvdata(pdev, data);
551 res = i5k_amb_hwmon_init(pdev);
553 goto err_init_failed;
558 iounmap(data->amb_mmio);
560 release_mem_region(data->amb_base, data->amb_len);
566 static int i5k_amb_remove(struct platform_device *pdev)
569 struct i5k_amb_data *data = platform_get_drvdata(pdev);
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);
576 iounmap(data->amb_mmio);
577 release_mem_region(data->amb_base, data->amb_len);
582 static struct platform_driver i5k_amb_driver = {
586 .probe = i5k_amb_probe,
587 .remove = i5k_amb_remove,
590 static int __init i5k_amb_init(void)
594 res = platform_driver_register(&i5k_amb_driver);
600 platform_driver_unregister(&i5k_amb_driver);
605 static void __exit i5k_amb_exit(void)
607 platform_device_unregister(amb_pdev);
608 platform_driver_unregister(&i5k_amb_driver);
612 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
613 MODULE_LICENSE("GPL");
615 module_init(i5k_amb_init);
616 module_exit(i5k_amb_exit);