// SPDX-License-Identifier: GPL-2.0-or-later /* * A hwmon driver for the Intel 5000 series chipset FB-DIMM AMB * temperature sensors * Copyright (C) 2007 IBM * * Author: Darrick J. Wong */ #include #include #include #include #include #include #include #include #include #define DRVNAME "i5k_amb" #define I5K_REG_AMB_BASE_ADDR 0x48 #define I5K_REG_AMB_LEN_ADDR 0x50 #define I5K_REG_CHAN0_PRESENCE_ADDR 0x64 #define I5K_REG_CHAN1_PRESENCE_ADDR 0x66 #define AMB_REG_TEMP_MIN_ADDR 0x80 #define AMB_REG_TEMP_MID_ADDR 0x81 #define AMB_REG_TEMP_MAX_ADDR 0x82 #define AMB_REG_TEMP_STATUS_ADDR 0x84 #define AMB_REG_TEMP_ADDR 0x85 #define AMB_CONFIG_SIZE 2048 #define AMB_FUNC_3_OFFSET 768 static unsigned long amb_reg_temp_status(unsigned int amb) { return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_STATUS_ADDR + AMB_CONFIG_SIZE * amb; } static unsigned long amb_reg_temp_min(unsigned int amb) { return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MIN_ADDR + AMB_CONFIG_SIZE * amb; } static unsigned long amb_reg_temp_mid(unsigned int amb) { return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MID_ADDR + AMB_CONFIG_SIZE * amb; } static unsigned long amb_reg_temp_max(unsigned int amb) { return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_MAX_ADDR + AMB_CONFIG_SIZE * amb; } static unsigned long amb_reg_temp(unsigned int amb) { return AMB_FUNC_3_OFFSET + AMB_REG_TEMP_ADDR + AMB_CONFIG_SIZE * amb; } #define MAX_MEM_CHANNELS 4 #define MAX_AMBS_PER_CHANNEL 16 #define MAX_AMBS (MAX_MEM_CHANNELS * \ MAX_AMBS_PER_CHANNEL) #define CHANNEL_SHIFT 4 #define DIMM_MASK 0xF /* * Ugly hack: For some reason the highest bit is set if there * are _any_ DIMMs in the channel. Attempting to read from * this "high-order" AMB results in a memory bus error, so * for now we'll just ignore that top bit, even though that * might prevent us from seeing the 16th DIMM in the channel. */ #define REAL_MAX_AMBS_PER_CHANNEL 15 #define KNOBS_PER_AMB 6 static unsigned long amb_num_from_reg(unsigned int byte_num, unsigned int bit) { return byte_num * MAX_AMBS_PER_CHANNEL + bit; } #define AMB_SYSFS_NAME_LEN 16 struct i5k_device_attribute { struct sensor_device_attribute s_attr; char name[AMB_SYSFS_NAME_LEN]; }; struct i5k_amb_data { struct device *hwmon_dev; unsigned long amb_base; unsigned long amb_len; u16 amb_present[MAX_MEM_CHANNELS]; void __iomem *amb_mmio; struct i5k_device_attribute *attrs; unsigned int num_attrs; }; static DEVICE_STRING_ATTR_RO(name, 0444, DRVNAME); static struct platform_device *amb_pdev; static u8 amb_read_byte(struct i5k_amb_data *data, unsigned long offset) { return ioread8(data->amb_mmio + offset); } static void amb_write_byte(struct i5k_amb_data *data, unsigned long offset, u8 val) { iowrite8(val, data->amb_mmio + offset); } static ssize_t show_amb_alarm(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); if (!(amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x20) && (amb_read_byte(data, amb_reg_temp_status(attr->index)) & 0x8)) return sprintf(buf, "1\n"); else return sprintf(buf, "0\n"); } static ssize_t store_amb_min(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); unsigned long temp; int ret = kstrtoul(buf, 10, &temp); if (ret < 0) return ret; temp = temp / 500; if (temp > 255) temp = 255; amb_write_byte(data, amb_reg_temp_min(attr->index), temp); return count; } static ssize_t store_amb_mid(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); unsigned long temp; int ret = kstrtoul(buf, 10, &temp); if (ret < 0) return ret; temp = temp / 500; if (temp > 255) temp = 255; amb_write_byte(data, amb_reg_temp_mid(attr->index), temp); return count; } static ssize_t store_amb_max(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); unsigned long temp; int ret = kstrtoul(buf, 10, &temp); if (ret < 0) return ret; temp = temp / 500; if (temp > 255) temp = 255; amb_write_byte(data, amb_reg_temp_max(attr->index), temp); return count; } static ssize_t show_amb_min(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", 500 * amb_read_byte(data, amb_reg_temp_min(attr->index))); } static ssize_t show_amb_mid(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", 500 * amb_read_byte(data, amb_reg_temp_mid(attr->index))); } static ssize_t show_amb_max(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", 500 * amb_read_byte(data, amb_reg_temp_max(attr->index))); } static ssize_t show_amb_temp(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); struct i5k_amb_data *data = dev_get_drvdata(dev); return sprintf(buf, "%d\n", 500 * amb_read_byte(data, amb_reg_temp(attr->index))); } static ssize_t show_label(struct device *dev, struct device_attribute *devattr, char *buf) { struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr); return sprintf(buf, "Ch. %d DIMM %d\n", attr->index >> CHANNEL_SHIFT, attr->index & DIMM_MASK); } static int i5k_amb_hwmon_init(struct platform_device *pdev) { int i, j, k, d = 0; u16 c; int res = 0; int num_ambs = 0; struct i5k_amb_data *data = platform_get_drvdata(pdev); /* Count the number of AMBs found */ /* ignore the high-order bit, see "Ugly hack" comment above */ for (i = 0; i < MAX_MEM_CHANNELS; i++) num_ambs += hweight16(data->amb_present[i] & 0x7fff); /* Set up sysfs stuff */ data->attrs = kzalloc(array3_size(num_ambs, KNOBS_PER_AMB, sizeof(*data->attrs)), GFP_KERNEL); if (!data->attrs) return -ENOMEM; data->num_attrs = 0; for (i = 0; i < MAX_MEM_CHANNELS; i++) { c = data->amb_present[i]; for (j = 0; j < REAL_MAX_AMBS_PER_CHANNEL; j++, c >>= 1) { struct i5k_device_attribute *iattr; k = amb_num_from_reg(i, j); if (!(c & 0x1)) continue; d++; /* sysfs label */ iattr = data->attrs + data->num_attrs; snprintf(iattr->name, AMB_SYSFS_NAME_LEN, "temp%d_label", d); iattr->s_attr.dev_attr.attr.name = iattr->name; iattr->s_attr.dev_attr.attr.mode = 0444; iattr->s_attr.dev_attr.show = show_label; iattr->s_attr.index = k; sysfs_attr_init(&iattr->s_attr.dev_attr.attr); res = device_create_file(&pdev->dev, &iattr->s_attr.dev_attr); if (res) goto exit_remove; data->num_attrs++; /* Temperature sysfs knob */ iattr = data->attrs + data->num_attrs; snprintf(iattr->name, AMB_SYSFS_NAME_LEN, "temp%d_input", d); iattr->s_attr.dev_attr.attr.name = iattr->name; iattr->s_attr.dev_attr.attr.mode = 0444; iattr->s_attr.dev_attr.show = show_amb_temp; iattr->s_attr.index = k; sysfs_attr_init(&iattr->s_attr.dev_attr.attr); res = device_create_file(&pdev->dev, &iattr->s_attr.dev_attr); if (res) goto exit_remove; data->num_attrs++; /* Temperature min sysfs knob */ iattr = data->attrs + data->num_attrs; snprintf(iattr->name, AMB_SYSFS_NAME_LEN, "temp%d_min", d); iattr->s_attr.dev_attr.attr.name = iattr->name; iattr->s_attr.dev_attr.attr.mode = 0644; iattr->s_attr.dev_attr.show = show_amb_min; iattr->s_attr.dev_attr.store = store_amb_min; iattr->s_attr.index = k; sysfs_attr_init(&iattr->s_attr.dev_attr.attr); res = device_create_file(&pdev->dev, &iattr->s_attr.dev_attr); if (res) goto exit_remove; data->num_attrs++; /* Temperature mid sysfs knob */ iattr = data->attrs + data->num_attrs; snprintf(iattr->name, AMB_SYSFS_NAME_LEN, "temp%d_mid", d); iattr->s_attr.dev_attr.attr.name = iattr->name; iattr->s_attr.dev_attr.attr.mode = 0644; iattr->s_attr.dev_attr.show = show_amb_mid; iattr->s_attr.dev_attr.store = store_amb_mid; iattr->s_attr.index = k; sysfs_attr_init(&iattr->s_attr.dev_attr.attr); res = device_create_file(&pdev->dev, &iattr->s_attr.dev_attr); if (res) goto exit_remove; data->num_attrs++; /* Temperature max sysfs knob */ iattr = data->attrs + data->num_attrs; snprintf(iattr->name, AMB_SYSFS_NAME_LEN, "temp%d_max", d); iattr->s_attr.dev_attr.attr.name = iattr->name; iattr->s_attr.dev_attr.attr.mode = 0644; iattr->s_attr.dev_attr.show = show_amb_max; iattr->s_attr.dev_attr.store = store_amb_max; iattr->s_attr.index = k; sysfs_attr_init(&iattr->s_attr.dev_attr.attr); res = device_create_file(&pdev->dev, &iattr->s_attr.dev_attr); if (res) goto exit_remove; data->num_attrs++; /* Temperature alarm sysfs knob */ iattr = data->attrs + data->num_attrs; snprintf(iattr->name, AMB_SYSFS_NAME_LEN, "temp%d_alarm", d); iattr->s_attr.dev_attr.attr.name = iattr->name; iattr->s_attr.dev_attr.attr.mode = 0444; iattr->s_attr.dev_attr.show = show_amb_alarm; iattr->s_attr.index = k; sysfs_attr_init(&iattr->s_attr.dev_attr.attr); res = device_create_file(&pdev->dev, &iattr->s_attr.dev_attr); if (res) goto exit_remove; data->num_attrs++; } } res = device_create_file(&pdev->dev, &dev_attr_name.attr); if (res) goto exit_remove; data->hwmon_dev = hwmon_device_register(&pdev->dev); if (IS_ERR(data->hwmon_dev)) { res = PTR_ERR(data->hwmon_dev); goto exit_remove; } return res; exit_remove: device_remove_file(&pdev->dev, &dev_attr_name.attr); for (i = 0; i < data->num_attrs; i++) device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); kfree(data->attrs); return res; } static int i5k_amb_add(void) { int res; /* only ever going to be one of these */ amb_pdev = platform_device_alloc(DRVNAME, 0); if (!amb_pdev) return -ENOMEM; res = platform_device_add(amb_pdev); if (res) goto err; return 0; err: platform_device_put(amb_pdev); return res; } static int i5k_find_amb_registers(struct i5k_amb_data *data, unsigned long devid) { struct pci_dev *pcidev; u32 val32; int res = -ENODEV; /* Find AMB register memory space */ pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, devid, NULL); if (!pcidev) return -ENODEV; pci_read_config_dword(pcidev, I5K_REG_AMB_BASE_ADDR, &val32); if (val32 == (u32)~0) goto out; data->amb_base = val32; pci_read_config_dword(pcidev, I5K_REG_AMB_LEN_ADDR, &val32); if (val32 == (u32)~0) goto out; data->amb_len = val32; /* Is it big enough? */ if (data->amb_len < AMB_CONFIG_SIZE * MAX_AMBS) { dev_err(&pcidev->dev, "AMB region too small!\n"); goto out; } res = 0; out: pci_dev_put(pcidev); return res; } static int i5k_channel_probe(u16 *amb_present, unsigned long dev_id) { struct pci_dev *pcidev; u16 val16; int res = -ENODEV; /* Copy the DIMM presence map for these two channels */ pcidev = pci_get_device(PCI_VENDOR_ID_INTEL, dev_id, NULL); if (!pcidev) return -ENODEV; pci_read_config_word(pcidev, I5K_REG_CHAN0_PRESENCE_ADDR, &val16); if (val16 == (u16)~0) goto out; amb_present[0] = val16; pci_read_config_word(pcidev, I5K_REG_CHAN1_PRESENCE_ADDR, &val16); if (val16 == (u16)~0) goto out; amb_present[1] = val16; res = 0; out: pci_dev_put(pcidev); return res; } static struct { unsigned long err; unsigned long fbd0; } chipset_ids[] = { { PCI_DEVICE_ID_INTEL_5000_ERR, PCI_DEVICE_ID_INTEL_5000_FBD0 }, { PCI_DEVICE_ID_INTEL_5400_ERR, PCI_DEVICE_ID_INTEL_5400_FBD0 }, { 0, 0 } }; #ifdef MODULE static const struct pci_device_id i5k_amb_ids[] = { { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) }, { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5400_ERR) }, { 0, } }; MODULE_DEVICE_TABLE(pci, i5k_amb_ids); #endif static int i5k_amb_probe(struct platform_device *pdev) { struct i5k_amb_data *data; struct resource *reso; int i, res; data = kzalloc(sizeof(*data), GFP_KERNEL); if (!data) return -ENOMEM; /* Figure out where the AMB registers live */ i = 0; do { res = i5k_find_amb_registers(data, chipset_ids[i].err); if (res == 0) break; i++; } while (chipset_ids[i].err); if (res) goto err; /* Copy the DIMM presence map for the first two channels */ res = i5k_channel_probe(&data->amb_present[0], chipset_ids[i].fbd0); if (res) goto err; /* Copy the DIMM presence map for the optional second two channels */ i5k_channel_probe(&data->amb_present[2], chipset_ids[i].fbd0 + 1); /* Set up resource regions */ reso = request_mem_region(data->amb_base, data->amb_len, DRVNAME); if (!reso) { res = -EBUSY; goto err; } data->amb_mmio = ioremap(data->amb_base, data->amb_len); if (!data->amb_mmio) { res = -EBUSY; goto err_map_failed; } platform_set_drvdata(pdev, data); res = i5k_amb_hwmon_init(pdev); if (res) goto err_init_failed; return res; err_init_failed: iounmap(data->amb_mmio); err_map_failed: release_mem_region(data->amb_base, data->amb_len); err: kfree(data); return res; } static void i5k_amb_remove(struct platform_device *pdev) { int i; struct i5k_amb_data *data = platform_get_drvdata(pdev); hwmon_device_unregister(data->hwmon_dev); device_remove_file(&pdev->dev, &dev_attr_name.attr); for (i = 0; i < data->num_attrs; i++) device_remove_file(&pdev->dev, &data->attrs[i].s_attr.dev_attr); kfree(data->attrs); iounmap(data->amb_mmio); release_mem_region(data->amb_base, data->amb_len); kfree(data); } static struct platform_driver i5k_amb_driver = { .driver = { .name = DRVNAME, }, .probe = i5k_amb_probe, .remove = i5k_amb_remove, }; static int __init i5k_amb_init(void) { int res; res = platform_driver_register(&i5k_amb_driver); if (res) return res; res = i5k_amb_add(); if (res) platform_driver_unregister(&i5k_amb_driver); return res; } static void __exit i5k_amb_exit(void) { platform_device_unregister(amb_pdev); platform_driver_unregister(&i5k_amb_driver); } MODULE_AUTHOR("Darrick J. Wong "); MODULE_DESCRIPTION("Intel 5000 chipset FB-DIMM AMB temperature sensor"); MODULE_LICENSE("GPL"); module_init(i5k_amb_init); module_exit(i5k_amb_exit);