--- /dev/null
-#include <asm/amd_hsmp.h>
+ // SPDX-License-Identifier: GPL-2.0
+ /*
+ * AMD HSMP hwmon support
+ * Copyright (c) 2025, AMD.
+ * All Rights Reserved.
+ *
+ * This file provides hwmon implementation for HSMP interface.
+ */
+
++#include <asm/amd/hsmp.h>
+
+ #include <linux/device.h>
+ #include <linux/err.h>
+ #include <linux/hwmon.h>
+ #include <linux/types.h>
+ #include <linux/units.h>
+
+ #include "hsmp.h"
+
+ #define HSMP_HWMON_NAME "amd_hsmp_hwmon"
+
+ static int hsmp_hwmon_write(struct device *dev, enum hwmon_sensor_types type,
+ u32 attr, int channel, long val)
+ {
+ u16 sock_ind = (uintptr_t)dev_get_drvdata(dev);
+ struct hsmp_message msg = {};
+
+ if (type != hwmon_power)
+ return -EOPNOTSUPP;
+
+ if (attr != hwmon_power_cap)
+ return -EOPNOTSUPP;
+
+ msg.num_args = 1;
+ msg.args[0] = val / MICROWATT_PER_MILLIWATT;
+ msg.msg_id = HSMP_SET_SOCKET_POWER_LIMIT;
+ msg.sock_ind = sock_ind;
+ return hsmp_send_message(&msg);
+ }
+
+ static int hsmp_hwmon_read(struct device *dev,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel, long *val)
+ {
+ u16 sock_ind = (uintptr_t)dev_get_drvdata(dev);
+ struct hsmp_message msg = {};
+ int ret;
+
+ if (type != hwmon_power)
+ return -EOPNOTSUPP;
+
+ msg.sock_ind = sock_ind;
+ msg.response_sz = 1;
+
+ switch (attr) {
+ case hwmon_power_input:
+ msg.msg_id = HSMP_GET_SOCKET_POWER;
+ break;
+ case hwmon_power_cap:
+ msg.msg_id = HSMP_GET_SOCKET_POWER_LIMIT;
+ break;
+ case hwmon_power_cap_max:
+ msg.msg_id = HSMP_GET_SOCKET_POWER_LIMIT_MAX;
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+
+ ret = hsmp_send_message(&msg);
+ if (!ret)
+ *val = msg.args[0] * MICROWATT_PER_MILLIWATT;
+
+ return ret;
+ }
+
+ static umode_t hsmp_hwmon_is_visble(const void *data,
+ enum hwmon_sensor_types type,
+ u32 attr, int channel)
+ {
+ if (type != hwmon_power)
+ return 0;
+
+ switch (attr) {
+ case hwmon_power_input:
+ return 0444;
+ case hwmon_power_cap:
+ return 0644;
+ case hwmon_power_cap_max:
+ return 0444;
+ default:
+ return 0;
+ }
+ }
+
+ static const struct hwmon_ops hsmp_hwmon_ops = {
+ .read = hsmp_hwmon_read,
+ .is_visible = hsmp_hwmon_is_visble,
+ .write = hsmp_hwmon_write,
+ };
+
+ static const struct hwmon_channel_info * const hsmp_info[] = {
+ HWMON_CHANNEL_INFO(power, HWMON_P_INPUT | HWMON_P_CAP | HWMON_P_CAP_MAX),
+ NULL
+ };
+
+ static const struct hwmon_chip_info hsmp_chip_info = {
+ .ops = &hsmp_hwmon_ops,
+ .info = hsmp_info,
+ };
+
+ int hsmp_create_sensor(struct device *dev, u16 sock_ind)
+ {
+ struct device *hwmon_dev;
+
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, HSMP_HWMON_NAME,
+ (void *)(uintptr_t)sock_ind,
+ &hsmp_chip_info,
+ NULL);
+ return PTR_ERR_OR_ZERO(hwmon_dev);
+ }
+ EXPORT_SYMBOL_NS(hsmp_create_sensor, "AMD_HSMP");
projects / linux-2.6-microblaze.git / commitdiff