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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB
0004  * temperature sensors
0005  * Copyright (C) 2007 IBM
0006  *
0007  * Author: Darrick J. Wong <darrick.wong@oracle.com>
0008  */
0009 
0010 #include <linux/module.h>
0011 #include <linux/hwmon.h>
0012 #include <linux/hwmon-sysfs.h>
0013 #include <linux/err.h>
0014 #include <linux/mutex.h>
0015 #include <linux/log2.h>
0016 #include <linux/pci.h>
0017 #include <linux/platform_device.h>
0018 #include <linux/slab.h>
0019 
0020 #define DRVNAME "i5k_amb"
0021 
0022 #define I5K_REG_AMB_BASE_ADDR       0x48
0023 #define I5K_REG_AMB_LEN_ADDR        0x50
0024 #define I5K_REG_CHAN0_PRESENCE_ADDR 0x64
0025 #define I5K_REG_CHAN1_PRESENCE_ADDR 0x66
0026 
0027 #define AMB_REG_TEMP_MIN_ADDR       0x80
0028 #define AMB_REG_TEMP_MID_ADDR       0x81
0029 #define AMB_REG_TEMP_MAX_ADDR       0x82
0030 #define AMB_REG_TEMP_STATUS_ADDR    0x84
0031 #define AMB_REG_TEMP_ADDR       0x85
0032 
0033 #define AMB_CONFIG_SIZE         2048
0034 #define AMB_FUNC_3_OFFSET       768
0035 
0036 static unsigned long amb_reg_temp_status(unsigned int amb)
0037 {
0038     return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR +
0039            AMB_CONFIG_SIZE * amb;
0040 }
0041 
0042 static unsigned long amb_reg_temp_min(unsigned int amb)
0043 {
0044     return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR +
0045            AMB_CONFIG_SIZE * amb;
0046 }
0047 
0048 static unsigned long amb_reg_temp_mid(unsigned int amb)
0049 {
0050     return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR +
0051            AMB_CONFIG_SIZE * amb;
0052 }
0053 
0054 static unsigned long amb_reg_temp_max(unsigned int amb)
0055 {
0056     return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR +
0057            AMB_CONFIG_SIZE * amb;
0058 }
0059 
0060 static unsigned long amb_reg_temp(unsigned int amb)
0061 {
0062     return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR +
0063            AMB_CONFIG_SIZE * amb;
0064 }
0065 
0066 #define MAX_MEM_CHANNELS        4
0067 #define MAX_AMBS_PER_CHANNEL        16
0068 #define MAX_AMBS            (MAX_MEM_CHANNELS * \
0069                      MAX_AMBS_PER_CHANNEL)
0070 #define CHANNEL_SHIFT           4
0071 #define DIMM_MASK           0xF
0072 /*
0073  * Ugly hack: For some reason the highest bit is set if there
0074  * are _any_ DIMMs in the channel.  Attempting to read from
0075  * this "high-order" AMB results in a memory bus error, so
0076  * for now we'll just ignore that top bit, even though that
0077  * might prevent us from seeing the 16th DIMM in the channel.
0078  */
0079 #define REAL_MAX_AMBS_PER_CHANNEL   15
0080 #define KNOBS_PER_AMB           6
0081 
0082 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit)
0083 {
0084     return byte_num * MAX_AMBS_PER_CHANNEL + bit;
0085 }
0086 
0087 #define AMB_SYSFS_NAME_LEN      16
0088 struct i5k_device_attribute {
0089     struct sensor_device_attribute s_attr;
0090     char name[AMB_SYSFS_NAME_LEN];
0091 };
0092 
0093 struct i5k_amb_data {
0094     struct device *hwmon_dev;
0095 
0096     unsigned long amb_base;
0097     unsigned long amb_len;
0098     u16 amb_present[MAX_MEM_CHANNELS];
0099     void __iomem *amb_mmio;
0100     struct i5k_device_attribute *attrs;
0101     unsigned int num_attrs;
0102 };
0103 
0104 static ssize_t name_show(struct device *dev, struct device_attribute *devattr,
0105              char *buf)
0106 {
0107     return sprintf(buf, "%s\n", DRVNAME);
0108 }
0109 
0110 
0111 static DEVICE_ATTR_RO(name);
0112 
0113 static struct platform_device *amb_pdev;
0114 
0115 static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset)
0116 {
0117     return ioread8(data->amb_mmio + offset);
0118 }
0119 
0120 static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset,
0121                u8 val)
0122 {
0123     iowrite8(val, data->amb_mmio + offset);
0124 }
0125 
0126 static ssize_t show_amb_alarm(struct device *dev,
0127                  struct device_attribute *devattr,
0128                  char *buf)
0129 {
0130     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0131     struct i5k_amb_data *data = dev_get_drvdata(dev);
0132 
0133     if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) &&
0134          (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8))
0135         return sprintf(buf, "1\n");
0136     else
0137         return sprintf(buf, "0\n");
0138 }
0139 
0140 static ssize_t store_amb_min(struct device *dev,
0141                  struct device_attribute *devattr,
0142                  const char *buf,
0143                  size_t count)
0144 {
0145     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0146     struct i5k_amb_data *data = dev_get_drvdata(dev);
0147     unsigned long temp;
0148     int ret = kstrtoul(buf, 10, &temp);
0149     if (ret < 0)
0150         return ret;
0151 
0152     temp = temp / 500;
0153     if (temp > 255)
0154         temp = 255;
0155 
0156     amb_write_byte(data, amb_reg_temp_min(attr->index), temp);
0157     return count;
0158 }
0159 
0160 static ssize_t store_amb_mid(struct device *dev,
0161                  struct device_attribute *devattr,
0162                  const char *buf,
0163                  size_t count)
0164 {
0165     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0166     struct i5k_amb_data *data = dev_get_drvdata(dev);
0167     unsigned long temp;
0168     int ret = kstrtoul(buf, 10, &temp);
0169     if (ret < 0)
0170         return ret;
0171 
0172     temp = temp / 500;
0173     if (temp > 255)
0174         temp = 255;
0175 
0176     amb_write_byte(data, amb_reg_temp_mid(attr->index), temp);
0177     return count;
0178 }
0179 
0180 static ssize_t store_amb_max(struct device *dev,
0181                  struct device_attribute *devattr,
0182                  const char *buf,
0183                  size_t count)
0184 {
0185     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0186     struct i5k_amb_data *data = dev_get_drvdata(dev);
0187     unsigned long temp;
0188     int ret = kstrtoul(buf, 10, &temp);
0189     if (ret < 0)
0190         return ret;
0191 
0192     temp = temp / 500;
0193     if (temp > 255)
0194         temp = 255;
0195 
0196     amb_write_byte(data, amb_reg_temp_max(attr->index), temp);
0197     return count;
0198 }
0199 
0200 static ssize_t show_amb_min(struct device *dev,
0201                  struct device_attribute *devattr,
0202                  char *buf)
0203 {
0204     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0205     struct i5k_amb_data *data = dev_get_drvdata(dev);
0206     return sprintf(buf, "%d\n",
0207         500 * amb_read_byte(data, amb_reg_temp_min(attr->index)));
0208 }
0209 
0210 static ssize_t show_amb_mid(struct device *dev,
0211                  struct device_attribute *devattr,
0212                  char *buf)
0213 {
0214     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0215     struct i5k_amb_data *data = dev_get_drvdata(dev);
0216     return sprintf(buf, "%d\n",
0217         500 * amb_read_byte(data, amb_reg_temp_mid(attr->index)));
0218 }
0219 
0220 static ssize_t show_amb_max(struct device *dev,
0221                  struct device_attribute *devattr,
0222                  char *buf)
0223 {
0224     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0225     struct i5k_amb_data *data = dev_get_drvdata(dev);
0226     return sprintf(buf, "%d\n",
0227         500 * amb_read_byte(data, amb_reg_temp_max(attr->index)));
0228 }
0229 
0230 static ssize_t show_amb_temp(struct device *dev,
0231                  struct device_attribute *devattr,
0232                  char *buf)
0233 {
0234     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0235     struct i5k_amb_data *data = dev_get_drvdata(dev);
0236     return sprintf(buf, "%d\n",
0237         500 * amb_read_byte(data, amb_reg_temp(attr->index)));
0238 }
0239 
0240 static ssize_t show_label(struct device *dev,
0241               struct device_attribute *devattr,
0242               char *buf)
0243 {
0244     struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
0245 
0246     return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT,
0247                attr->index & DIMM_MASK);
0248 }
0249 
0250 static int i5k_amb_hwmon_init(struct platform_device *pdev)
0251 {
0252     int i, j, k, d = 0;
0253     u16 c;
0254     int res = 0;
0255     int num_ambs = 0;
0256     struct i5k_amb_data *data = platform_get_drvdata(pdev);
0257 
0258     /* Count the number of AMBs found */
0259     /* ignore the high-order bit, see "Ugly hack" comment above */
0260     for (i = 0; i < MAX_MEM_CHANNELS; i++)
0261         num_ambs += hweight16(data->amb_present[i] & 0x7fff);
0262 
0263     /* Set up sysfs stuff */
0264     data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB,
0265                       sizeof(*data->attrs)),
0266                   GFP_KERNEL);
0267     if (!data->attrs)
0268         return -ENOMEM;
0269     data->num_attrs = 0;
0270 
0271     for (i = 0; i < MAX_MEM_CHANNELS; i++) {
0272         c = data->amb_present[i];
0273         for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) {
0274             struct i5k_device_attribute *iattr;
0275 
0276             k = amb_num_from_reg(i, j);
0277             if (!(c & 0x1))
0278                 continue;
0279             d++;
0280 
0281             /* sysfs label */
0282             iattr = data->attrs + data->num_attrs;
0283             snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
0284                  "temp%d_label", d);
0285             iattr->s_attr.dev_attr.attr.name = iattr->name;
0286             iattr->s_attr.dev_attr.attr.mode = 0444;
0287             iattr->s_attr.dev_attr.show = show_label;
0288             iattr->s_attr.index = k;
0289             sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
0290             res = device_create_file(&pdev->dev,
0291                          &iattr->s_attr.dev_attr);
0292             if (res)
0293                 goto exit_remove;
0294             data->num_attrs++;
0295 
0296             /* Temperature sysfs knob */
0297             iattr = data->attrs + data->num_attrs;
0298             snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
0299                  "temp%d_input", d);
0300             iattr->s_attr.dev_attr.attr.name = iattr->name;
0301             iattr->s_attr.dev_attr.attr.mode = 0444;
0302             iattr->s_attr.dev_attr.show = show_amb_temp;
0303             iattr->s_attr.index = k;
0304             sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
0305             res = device_create_file(&pdev->dev,
0306                          &iattr->s_attr.dev_attr);
0307             if (res)
0308                 goto exit_remove;
0309             data->num_attrs++;
0310 
0311             /* Temperature min sysfs knob */
0312             iattr = data->attrs + data->num_attrs;
0313             snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
0314                  "temp%d_min", d);
0315             iattr->s_attr.dev_attr.attr.name = iattr->name;
0316             iattr->s_attr.dev_attr.attr.mode = 0644;
0317             iattr->s_attr.dev_attr.show = show_amb_min;
0318             iattr->s_attr.dev_attr.store = store_amb_min;
0319             iattr->s_attr.index = k;
0320             sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
0321             res = device_create_file(&pdev->dev,
0322                          &iattr->s_attr.dev_attr);
0323             if (res)
0324                 goto exit_remove;
0325             data->num_attrs++;
0326 
0327             /* Temperature mid sysfs knob */
0328             iattr = data->attrs + data->num_attrs;
0329             snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
0330                  "temp%d_mid", d);
0331             iattr->s_attr.dev_attr.attr.name = iattr->name;
0332             iattr->s_attr.dev_attr.attr.mode = 0644;
0333             iattr->s_attr.dev_attr.show = show_amb_mid;
0334             iattr->s_attr.dev_attr.store = store_amb_mid;
0335             iattr->s_attr.index = k;
0336             sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
0337             res = device_create_file(&pdev->dev,
0338                          &iattr->s_attr.dev_attr);
0339             if (res)
0340                 goto exit_remove;
0341             data->num_attrs++;
0342 
0343             /* Temperature max sysfs knob */
0344             iattr = data->attrs + data->num_attrs;
0345             snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
0346                  "temp%d_max", d);
0347             iattr->s_attr.dev_attr.attr.name = iattr->name;
0348             iattr->s_attr.dev_attr.attr.mode = 0644;
0349             iattr->s_attr.dev_attr.show = show_amb_max;
0350             iattr->s_attr.dev_attr.store = store_amb_max;
0351             iattr->s_attr.index = k;
0352             sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
0353             res = device_create_file(&pdev->dev,
0354                          &iattr->s_attr.dev_attr);
0355             if (res)
0356                 goto exit_remove;
0357             data->num_attrs++;
0358 
0359             /* Temperature alarm sysfs knob */
0360             iattr = data->attrs + data->num_attrs;
0361             snprintf(iattr->name, AMB_SYSFS_NAME_LEN,
0362                  "temp%d_alarm", d);
0363             iattr->s_attr.dev_attr.attr.name = iattr->name;
0364             iattr->s_attr.dev_attr.attr.mode = 0444;
0365             iattr->s_attr.dev_attr.show = show_amb_alarm;
0366             iattr->s_attr.index = k;
0367             sysfs_attr_init(&iattr->s_attr.dev_attr.attr);
0368             res = device_create_file(&pdev->dev,
0369                          &iattr->s_attr.dev_attr);
0370             if (res)
0371                 goto exit_remove;
0372             data->num_attrs++;
0373         }
0374     }
0375 
0376     res = device_create_file(&pdev->dev, &dev_attr_name);
0377     if (res)
0378         goto exit_remove;
0379 
0380     data->hwmon_dev = hwmon_device_register(&pdev->dev);
0381     if (IS_ERR(data->hwmon_dev)) {
0382         res = PTR_ERR(data->hwmon_dev);
0383         goto exit_remove;
0384     }
0385 
0386     return res;
0387 
0388 exit_remove:
0389     device_remove_file(&pdev->dev, &dev_attr_name);
0390     for (i = 0; i < data->num_attrs; i++)
0391         device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
0392     kfree(data->attrs);
0393 
0394     return res;
0395 }
0396 
0397 static int i5k_amb_add(void)
0398 {
0399     int res;
0400 
0401     /* only ever going to be one of these */
0402     amb_pdev = platform_device_alloc(DRVNAME, 0);
0403     if (!amb_pdev)
0404         return -ENOMEM;
0405 
0406     res = platform_device_add(amb_pdev);
0407     if (res)
0408         goto err;
0409     return 0;
0410 
0411 err:
0412     platform_device_put(amb_pdev);
0413     return res;
0414 }
0415 
0416 static int i5k_find_amb_registers(struct i5k_amb_data *data,
0417                         unsigned long devid)
0418 {
0419     struct pci_dev *pcidev;
0420     u32 val32;
0421     int res = -ENODEV;
0422 
0423     /* Find AMB register memory space */
0424     pcidev = pci_get_device(PCI_VENDOR_ID_INTEL,
0425                 devid,
0426                 NULL);
0427     if (!pcidev)
0428         return -ENODEV;
0429 
0430     pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32);
0431     if (val32 == (u32)~0)
0432         goto out;
0433     data->amb_base = val32;
0434 
0435     pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32);
0436     if (val32 == (u32)~0)
0437         goto out;
0438     data->amb_len = val32;
0439 
0440     /* Is it big enough? */
0441     if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) {
0442         dev_err(&pcidev->dev, "AMB region too small!\n");
0443         goto out;
0444     }
0445 
0446     res = 0;
0447 out:
0448     pci_dev_put(pcidev);
0449     return res;
0450 }
0451 
0452 static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id)
0453 {
0454     struct pci_dev *pcidev;
0455     u16 val16;
0456     int res = -ENODEV;
0457 
0458     /* Copy the DIMM presence map for these two channels */
0459     pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL);
0460     if (!pcidev)
0461         return -ENODEV;
0462 
0463     pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16);
0464     if (val16 == (u16)~0)
0465         goto out;
0466     amb_present[0] = val16;
0467 
0468     pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16);
0469     if (val16 == (u16)~0)
0470         goto out;
0471     amb_present[1] = val16;
0472 
0473     res = 0;
0474 
0475 out:
0476     pci_dev_put(pcidev);
0477     return res;
0478 }
0479 
0480 static struct {
0481     unsigned long err;
0482     unsigned long fbd0;
0483 } chipset_ids[]  = {
0484     { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 },
0485     { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 },
0486     { 0, 0 }
0487 };
0488 
0489 #ifdef MODULE
0490 static const struct pci_device_id i5k_amb_ids[] = {
0491     { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
0492     { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) },
0493     { 0, }
0494 };
0495 MODULE_DEVICE_TABLE(pci, i5k_amb_ids);
0496 #endif
0497 
0498 static int i5k_amb_probe(struct platform_device *pdev)
0499 {
0500     struct i5k_amb_data *data;
0501     struct resource *reso;
0502     int i, res;
0503 
0504     data = kzalloc(sizeof(*data), GFP_KERNEL);
0505     if (!data)
0506         return -ENOMEM;
0507 
0508     /* Figure out where the AMB registers live */
0509     i = 0;
0510     do {
0511         res = i5k_find_amb_registers(data, chipset_ids[i].err);
0512         if (res == 0)
0513             break;
0514         i++;
0515     } while (chipset_ids[i].err);
0516 
0517     if (res)
0518         goto err;
0519 
0520     /* Copy the DIMM presence map for the first two channels */
0521     res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0);
0522     if (res)
0523         goto err;
0524 
0525     /* Copy the DIMM presence map for the optional second two channels */
0526     i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1);
0527 
0528     /* Set up resource regions */
0529     reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME);
0530     if (!reso) {
0531         res = -EBUSY;
0532         goto err;
0533     }
0534 
0535     data->amb_mmio = ioremap(data->amb_base, data->amb_len);
0536     if (!data->amb_mmio) {
0537         res = -EBUSY;
0538         goto err_map_failed;
0539     }
0540 
0541     platform_set_drvdata(pdev, data);
0542 
0543     res = i5k_amb_hwmon_init(pdev);
0544     if (res)
0545         goto err_init_failed;
0546 
0547     return res;
0548 
0549 err_init_failed:
0550     iounmap(data->amb_mmio);
0551 err_map_failed:
0552     release_mem_region(data->amb_base, data->amb_len);
0553 err:
0554     kfree(data);
0555     return res;
0556 }
0557 
0558 static int i5k_amb_remove(struct platform_device *pdev)
0559 {
0560     int i;
0561     struct i5k_amb_data *data = platform_get_drvdata(pdev);
0562 
0563     hwmon_device_unregister(data->hwmon_dev);
0564     device_remove_file(&pdev->dev, &dev_attr_name);
0565     for (i = 0; i < data->num_attrs; i++)
0566         device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr);
0567     kfree(data->attrs);
0568     iounmap(data->amb_mmio);
0569     release_mem_region(data->amb_base, data->amb_len);
0570     kfree(data);
0571     return 0;
0572 }
0573 
0574 static struct platform_driver i5k_amb_driver = {
0575     .driver = {
0576         .name = DRVNAME,
0577     },
0578     .probe = i5k_amb_probe,
0579     .remove = i5k_amb_remove,
0580 };
0581 
0582 static int __init i5k_amb_init(void)
0583 {
0584     int res;
0585 
0586     res = platform_driver_register(&i5k_amb_driver);
0587     if (res)
0588         return res;
0589 
0590     res = i5k_amb_add();
0591     if (res)
0592         platform_driver_unregister(&i5k_amb_driver);
0593 
0594     return res;
0595 }
0596 
0597 static void __exit i5k_amb_exit(void)
0598 {
0599     platform_device_unregister(amb_pdev);
0600     platform_driver_unregister(&i5k_amb_driver);
0601 }
0602 
0603 MODULE_AUTHOR("Darrick J. Wong <darrick.wong@oracle.com>");
0604 MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor");
0605 MODULE_LICENSE("GPL");
0606 
0607 module_init(i5k_amb_init);
0608 module_exit(i5k_amb_exit);
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