// SPDX-License-Identifier: GPL-2.0 /* * Intel MAX 10 BMC HWMON Driver * * Copyright (C) 2018-2020 Intel Corporation. All rights reserved. * */ #include <linux/device.h> #include <linux/hwmon.h> #include <linux/mfd/intel-m10-bmc.h> #include <linux/module.h> #include <linux/mod_devicetable.h> #include <linux/platform_device.h> struct m10bmc_sdata { unsigned int reg_input; unsigned int reg_max; unsigned int reg_crit; unsigned int reg_hyst; unsigned int reg_min; unsigned int multiplier; const char *label; }; struct m10bmc_hwmon_board_data { const struct m10bmc_sdata *tables[hwmon_max]; const struct hwmon_channel_info **hinfo; }; struct m10bmc_hwmon { struct device *dev; struct hwmon_chip_info chip; char *hw_name; struct intel_m10bmc *m10bmc; const struct m10bmc_hwmon_board_data *bdata; }; static const struct m10bmc_sdata n3000bmc_temp_tbl[] = { { 0x100, 0x104, 0x108, 0x10c, 0x0, 500, "Board Temperature" }, { 0x110, 0x114, 0x118, 0x0, 0x0, 500, "FPGA Die Temperature" }, { 0x11c, 0x124, 0x120, 0x0, 0x0, 500, "QSFP0 Temperature" }, { 0x12c, 0x134, 0x130, 0x0, 0x0, 500, "QSFP1 Temperature" }, { 0x168, 0x0, 0x0, 0x0, 0x0, 500, "Retimer A Temperature" }, { 0x16c, 0x0, 0x0, 0x0, 0x0, 500, "Retimer A SerDes Temperature" }, { 0x170, 0x0, 0x0, 0x0, 0x0, 500, "Retimer B Temperature" }, { 0x174, 0x0, 0x0, 0x0, 0x0, 500, "Retimer B SerDes Temperature" }, }; static const struct m10bmc_sdata n3000bmc_in_tbl[] = { { 0x128, 0x0, 0x0, 0x0, 0x0, 1, "QSFP0 Supply Voltage" }, { 0x138, 0x0, 0x0, 0x0, 0x0, 1, "QSFP1 Supply Voltage" }, { 0x13c, 0x0, 0x0, 0x0, 0x0, 1, "FPGA Core Voltage" }, { 0x144, 0x0, 0x0, 0x0, 0x0, 1, "12V Backplane Voltage" }, { 0x14c, 0x0, 0x0, 0x0, 0x0, 1, "1.2V Voltage" }, { 0x150, 0x0, 0x0, 0x0, 0x0, 1, "12V AUX Voltage" }, { 0x158, 0x0, 0x0, 0x0, 0x0, 1, "1.8V Voltage" }, { 0x15c, 0x0, 0x0, 0x0, 0x0, 1, "3.3V Voltage" }, }; static const struct m10bmc_sdata n3000bmc_curr_tbl[] = { { 0x140, 0x0, 0x0, 0x0, 0x0, 1, "FPGA Core Current" }, { 0x148, 0x0, 0x0, 0x0, 0x0, 1, "12V Backplane Current" }, { 0x154, 0x0, 0x0, 0x0, 0x0, 1, "12V AUX Current" }, }; static const struct m10bmc_sdata n3000bmc_power_tbl[] = { { 0x160, 0x0, 0x0, 0x0, 0x0, 1000, "Board Power" }, }; static const struct hwmon_channel_info *n3000bmc_hinfo[] = { HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_CRIT | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_LABEL, HWMON_T_INPUT | HWMON_T_LABEL), HWMON_CHANNEL_INFO(in, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL, HWMON_I_INPUT | HWMON_I_LABEL), HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT | HWMON_C_LABEL, HWMON_C_INPUT | HWMON_C_LABEL, HWMON_C_INPUT | HWMON_C_LABEL), HWMON_CHANNEL_INFO(power, HWMON_P_INPUT | HWMON_P_LABEL), NULL }; static const struct m10bmc_hwmon_board_data n3000bmc_hwmon_bdata = { .tables = { [hwmon_temp] = n3000bmc_temp_tbl, [hwmon_in] = n3000bmc_in_tbl, [hwmon_curr] = n3000bmc_curr_tbl, [hwmon_power] = n3000bmc_power_tbl, }, .hinfo = n3000bmc_hinfo, }; static umode_t m10bmc_hwmon_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, int channel) { return 0444; } static const struct m10bmc_sdata * find_sensor_data(struct m10bmc_hwmon *hw, enum hwmon_sensor_types type, int channel) { const struct m10bmc_sdata *tbl; tbl = hw->bdata->tables[type]; if (!tbl) return ERR_PTR(-EOPNOTSUPP); return &tbl[channel]; } static int do_sensor_read(struct m10bmc_hwmon *hw, const struct m10bmc_sdata *data, unsigned int regoff, long *val) { unsigned int regval; int ret; ret = m10bmc_sys_read(hw->m10bmc, regoff, ®val); if (ret) return ret; /* * BMC Firmware will return 0xdeadbeef if the sensor value is invalid * at that time. This usually happens on sensor channels which connect * to external pluggable modules, e.g. QSFP temperature and voltage. * When the QSFP is unplugged from cage, driver will get 0xdeadbeef * from their registers. */ if (regval == 0xdeadbeef) return -ENODATA; *val = regval * data->multiplier; return 0; } static int m10bmc_hwmon_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, long *val) { struct m10bmc_hwmon *hw = dev_get_drvdata(dev); unsigned int reg = 0, reg_hyst = 0; const struct m10bmc_sdata *data; long hyst, value; int ret; data = find_sensor_data(hw, type, channel); if (IS_ERR(data)) return PTR_ERR(data); switch (type) { case hwmon_temp: switch (attr) { case hwmon_temp_input: reg = data->reg_input; break; case hwmon_temp_max_hyst: reg_hyst = data->reg_hyst; fallthrough; case hwmon_temp_max: reg = data->reg_max; break; case hwmon_temp_crit_hyst: reg_hyst = data->reg_hyst; fallthrough; case hwmon_temp_crit: reg = data->reg_crit; break; default: return -EOPNOTSUPP; } break; case hwmon_in: switch (attr) { case hwmon_in_input: reg = data->reg_input; break; case hwmon_in_max: reg = data->reg_max; break; case hwmon_in_crit: reg = data->reg_crit; break; case hwmon_in_min: reg = data->reg_min; break; default: return -EOPNOTSUPP; } break; case hwmon_curr: switch (attr) { case hwmon_curr_input: reg = data->reg_input; break; case hwmon_curr_max: reg = data->reg_max; break; case hwmon_curr_crit: reg = data->reg_crit; break; default: return -EOPNOTSUPP; } break; case hwmon_power: switch (attr) { case hwmon_power_input: reg = data->reg_input; break; default: return -EOPNOTSUPP; } break; default: return -EOPNOTSUPP; } if (!reg) return -EOPNOTSUPP; ret = do_sensor_read(hw, data, reg, &value); if (ret) return ret; if (reg_hyst) { ret = do_sensor_read(hw, data, reg_hyst, &hyst); if (ret) return ret; value -= hyst; } *val = value; return 0; } static int m10bmc_hwmon_read_string(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, const char **str) { struct m10bmc_hwmon *hw = dev_get_drvdata(dev); const struct m10bmc_sdata *data; data = find_sensor_data(hw, type, channel); if (IS_ERR(data)) return PTR_ERR(data); *str = data->label; return 0; } static const struct hwmon_ops m10bmc_hwmon_ops = { .is_visible = m10bmc_hwmon_is_visible, .read = m10bmc_hwmon_read, .read_string = m10bmc_hwmon_read_string, }; static int m10bmc_hwmon_probe(struct platform_device *pdev) { const struct platform_device_id *id = platform_get_device_id(pdev); struct intel_m10bmc *m10bmc = dev_get_drvdata(pdev->dev.parent); struct device *hwmon_dev, *dev = &pdev->dev; struct m10bmc_hwmon *hw; int i; hw = devm_kzalloc(dev, sizeof(*hw), GFP_KERNEL); if (!hw) return -ENOMEM; hw->dev = dev; hw->m10bmc = m10bmc; hw->bdata = (const struct m10bmc_hwmon_board_data *)id->driver_data; hw->chip.info = hw->bdata->hinfo; hw->chip.ops = &m10bmc_hwmon_ops; hw->hw_name = devm_kstrdup(dev, id->name, GFP_KERNEL); if (!hw->hw_name) return -ENOMEM; for (i = 0; hw->hw_name[i]; i++) if (hwmon_is_bad_char(hw->hw_name[i])) hw->hw_name[i] = '_'; hwmon_dev = devm_hwmon_device_register_with_info(dev, hw->hw_name, hw, &hw->chip, NULL); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct platform_device_id intel_m10bmc_hwmon_ids[] = { { .name = "n3000bmc-hwmon", .driver_data = (unsigned long)&n3000bmc_hwmon_bdata, }, { } }; static struct platform_driver intel_m10bmc_hwmon_driver = { .probe = m10bmc_hwmon_probe, .driver = { .name = "intel-m10-bmc-hwmon", }, .id_table = intel_m10bmc_hwmon_ids, }; module_platform_driver(intel_m10bmc_hwmon_driver); MODULE_DEVICE_TABLE(platform, intel_m10bmc_hwmon_ids); MODULE_AUTHOR("Intel Corporation"); MODULE_DESCRIPTION("Intel MAX 10 BMC hardware monitor"); MODULE_LICENSE("GPL");