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Message-Id: <1489524906-19411-5-git-send-email-eajames@linux.vnet.ibm.com>
Date: Tue, 14 Mar 2017 15:55:05 -0500
From: Eddie James <eajames@...ux.vnet.ibm.com>
To: linux@...ck-us.net
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
jdelvare@...e.com, corbet@....net, mark.rutland@....com,
robh+dt@...nel.org, wsa@...-dreams.de, andrew@...id.au,
benh@...nel.crashing.org, joel@....id.au,
"Edward A. James" <eajames@...ibm.com>
Subject: [PATCH linux v9 4/5] hwmon: occ: Add callbacks for parsing P8 OCC datastructures
From: "Edward A. James" <eajames@...ibm.com>
Add functions to parse the data structures that are specific to the OCC
on the POWER8 processor. These are the sensor data structures, including
temperature, frequency, power, and "caps."
Signed-off-by: Edward A. James <eajames@...ibm.com>
Signed-off-by: Andrew Jeffery <andrew@...id.au>
---
Documentation/hwmon/occ | 9 ++
drivers/hwmon/occ/Makefile | 2 +-
drivers/hwmon/occ/occ_p8.c | 256 +++++++++++++++++++++++++++++++++++++++++++++
drivers/hwmon/occ/occ_p8.h | 25 +++++
4 files changed, 291 insertions(+), 1 deletion(-)
create mode 100644 drivers/hwmon/occ/occ_p8.c
create mode 100644 drivers/hwmon/occ/occ_p8.h
diff --git a/Documentation/hwmon/occ b/Documentation/hwmon/occ
index 580af26..4ec8842 100644
--- a/Documentation/hwmon/occ
+++ b/Documentation/hwmon/occ
@@ -27,6 +27,15 @@ Currently, all versions of the OCC support four types of sensor data: power,
temperature, frequency, and "caps," which indicate limits and thresholds used
internally on the OCC.
+The format for the POWER8 OCC sensor data can be found in the P8 OCC
+specification:
+github.com/open-power/docs/blob/master/occ/OCC_OpenPwr_FW_Interfaces.pdf
+This document provides the details of the OCC sensors: power, frequency,
+temperature, and caps. These sensor formats are specific to the POWER8 OCC. A
+number of data structures, such as command format, response headers, and the
+like, are also defined in this specification, and are common to both POWER8 and
+POWER9 OCCs.
+
sysfs Entries
-------------
diff --git a/drivers/hwmon/occ/Makefile b/drivers/hwmon/occ/Makefile
index 9cc36e7..f59cca4 100644
--- a/drivers/hwmon/occ/Makefile
+++ b/drivers/hwmon/occ/Makefile
@@ -1 +1 @@
-obj-$(CONFIG_SENSORS_IBM_OCC) += occ.o occ_sysfs.o occ_scom_i2c.o
+obj-$(CONFIG_SENSORS_IBM_OCC) += occ.o occ_sysfs.o occ_scom_i2c.o occ_p8.o
diff --git a/drivers/hwmon/occ/occ_p8.c b/drivers/hwmon/occ/occ_p8.c
new file mode 100644
index 0000000..ae8b453
--- /dev/null
+++ b/drivers/hwmon/occ/occ_p8.c
@@ -0,0 +1,256 @@
+/*
+ * occ_p8.c - OCC hwmon driver
+ *
+ * This file contains the Power8-specific methods and data structures for
+ * the OCC hwmon driver.
+ *
+ * Copyright 2017 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <asm/unaligned.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/hwmon.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include "occ.h"
+#include "occ_p8.h"
+
+/* P8 OCC sensor data format */
+struct p8_occ_sensor {
+ u16 sensor_id;
+ u16 value;
+};
+
+struct p8_power_sensor {
+ u16 sensor_id;
+ u32 update_tag;
+ u32 accumulator;
+ u16 value;
+};
+
+struct p8_caps_sensor {
+ u16 curr_powercap;
+ u16 curr_powerreading;
+ u16 norm_powercap;
+ u16 max_powercap;
+ u16 min_powercap;
+ u16 user_powerlimit;
+};
+
+/* value, sensor_id */
+#define FREQ_SENSOR_CONFIG (HWMON_I_INPUT | HWMON_I_LABEL)
+#define TEMP_SENSOR_CONFIG (HWMON_T_INPUT | HWMON_T_LABEL)
+
+/* value, sensor_id, accumulator, update_tag */
+#define POWER_SENSOR_CONFIG \
+( \
+ HWMON_P_INPUT | HWMON_P_LABEL | HWMON_P_AVERAGE | \
+ HWMON_P_AVERAGE_INTERVAL \
+)
+
+/* curr_powercap, max_powercap, min_powercap, norm_powercap, user_powerlimit */
+#define CAPS_SENSOR_CONFIG \
+( \
+ HWMON_P_CAP | HWMON_P_CAP_MAX | HWMON_P_CAP_MIN | HWMON_P_MAX | \
+ HWMON_P_ALARM \
+)
+
+static const u32 p8_sensor_hwmon_configs[MAX_OCC_SENSOR_TYPE] = {
+ FREQ_SENSOR_CONFIG,
+ TEMP_SENSOR_CONFIG,
+ POWER_SENSOR_CONFIG,
+ CAPS_SENSOR_CONFIG,
+};
+
+void p8_parse_sensor(u8 *data, void *sensor, int sensor_type, int off,
+ int snum)
+{
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ {
+ struct p8_occ_sensor *os =
+ &(((struct p8_occ_sensor *)sensor)[snum]);
+
+ os->sensor_id = be16_to_cpu(get_unaligned((u16 *)&data[off]));
+ os->value = be16_to_cpu(get_unaligned((u16 *)&data[off + 2]));
+ }
+ break;
+ case POWER:
+ {
+ struct p8_power_sensor *ps =
+ &(((struct p8_power_sensor *)sensor)[snum]);
+
+ ps->sensor_id = be16_to_cpu(get_unaligned((u16 *)&data[off]));
+ ps->update_tag =
+ be32_to_cpu(get_unaligned((u32 *)&data[off + 2]));
+ ps->accumulator =
+ be32_to_cpu(get_unaligned((u32 *)&data[off + 6]));
+ ps->value = be16_to_cpu(get_unaligned((u16 *)&data[off + 10]));
+ }
+ break;
+ case CAPS:
+ {
+ struct p8_caps_sensor *cs =
+ &(((struct p8_caps_sensor *)sensor)[snum]);
+
+ cs->curr_powercap =
+ be16_to_cpu(get_unaligned((u16 *)&data[off]));
+ cs->curr_powerreading =
+ be16_to_cpu(get_unaligned((u16 *)&data[off + 2]));
+ cs->norm_powercap =
+ be16_to_cpu(get_unaligned((u16 *)&data[off + 4]));
+ cs->max_powercap =
+ be16_to_cpu(get_unaligned((u16 *)&data[off + 6]));
+ cs->min_powercap =
+ be16_to_cpu(get_unaligned((u16 *)&data[off + 8]));
+ cs->user_powerlimit =
+ be16_to_cpu(get_unaligned((u16 *)&data[off + 10]));
+ }
+ break;
+ };
+}
+
+void *p8_alloc_sensor(struct device *dev, int sensor_type, int num_sensors)
+{
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ return devm_kzalloc(dev, num_sensors *
+ sizeof(struct p8_occ_sensor), GFP_KERNEL);
+ case POWER:
+ return devm_kzalloc(dev, num_sensors *
+ sizeof(struct p8_power_sensor),
+ GFP_KERNEL);
+ case CAPS:
+ return devm_kzalloc(dev, num_sensors *
+ sizeof(struct p8_caps_sensor), GFP_KERNEL);
+ default:
+ return NULL;
+ }
+}
+
+int p8_get_sensor(struct occ *driver, int sensor_type, int sensor_num,
+ u32 hwmon, long *val)
+{
+ int rc = 0;
+ void *sensor;
+
+ if (sensor_type == POWER) {
+ if (hwmon == hwmon_power_cap || hwmon == hwmon_power_cap_max ||
+ hwmon == hwmon_power_cap_min || hwmon == hwmon_power_max ||
+ hwmon == hwmon_power_alarm)
+ sensor_type = CAPS;
+ }
+
+ sensor = occ_get_sensor(driver, sensor_type);
+ if (!sensor)
+ return -ENODEV;
+
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ {
+ struct p8_occ_sensor *os =
+ &(((struct p8_occ_sensor *)sensor)[sensor_num]);
+
+ if (hwmon == hwmon_in_input || hwmon == hwmon_temp_input)
+ *val = os->value;
+ else if (hwmon == hwmon_in_label || hwmon == hwmon_temp_label)
+ *val = os->sensor_id;
+ else
+ rc = -EOPNOTSUPP;
+ }
+ break;
+ case POWER:
+ {
+ struct p8_power_sensor *ps =
+ &(((struct p8_power_sensor *)sensor)[sensor_num]);
+
+ switch (hwmon) {
+ case hwmon_power_input:
+ *val = ps->value;
+ break;
+ case hwmon_power_label:
+ *val = ps->sensor_id;
+ break;
+ case hwmon_power_average:
+ *val = ps->accumulator;
+ break;
+ case hwmon_power_average_interval:
+ *val = ps->update_tag;
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ }
+ }
+ break;
+ case CAPS:
+ {
+ struct p8_caps_sensor *cs =
+ &(((struct p8_caps_sensor *)sensor)[sensor_num]);
+
+ switch (hwmon) {
+ case hwmon_power_cap:
+ *val = cs->curr_powercap;
+ break;
+ case hwmon_power_cap_max:
+ *val = cs->max_powercap;
+ break;
+ case hwmon_power_cap_min:
+ *val = cs->min_powercap;
+ break;
+ case hwmon_power_max:
+ *val = cs->norm_powercap;
+ break;
+ case hwmon_power_alarm:
+ *val = cs->user_powerlimit;
+ break;
+ default:
+ rc = -EOPNOTSUPP;
+ }
+ }
+ break;
+ default:
+ rc = -EINVAL;
+ }
+
+ return rc;
+}
+
+static const struct occ_ops p8_ops = {
+ .parse_sensor = p8_parse_sensor,
+ .alloc_sensor = p8_alloc_sensor,
+ .get_sensor = p8_get_sensor,
+};
+
+static const struct occ_init_data p8_init = {
+ .command_addr = 0xFFFF6000,
+ .response_addr = 0xFFFF7000,
+ .ops = &p8_ops,
+};
+
+const u32 *p8_get_sensor_hwmon_configs()
+{
+ return p8_sensor_hwmon_configs;
+}
+
+struct occ *p8_occ_init(struct device *dev, void *bus,
+ const struct occ_bus_ops *bus_ops)
+{
+ return occ_init(dev, bus, bus_ops, &p8_init);
+}
+
+MODULE_AUTHOR("Eddie James <eajames@...ibm.com>");
+MODULE_DESCRIPTION("P8 OCC sensors");
+MODULE_LICENSE("GPL");
diff --git a/drivers/hwmon/occ/occ_p8.h b/drivers/hwmon/occ/occ_p8.h
new file mode 100644
index 0000000..5f9cceb
--- /dev/null
+++ b/drivers/hwmon/occ/occ_p8.h
@@ -0,0 +1,25 @@
+/*
+ * occ_p8.h - OCC hwmon driver
+ *
+ * This file contains Power8-specific function prototypes
+ *
+ * Copyright 2017 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __OCC_P8_H__
+#define __OCC_P8_H__
+
+struct device;
+struct occ;
+struct occ_bus_ops;
+
+const u32 *p8_get_sensor_hwmon_configs(void);
+struct occ *p8_occ_init(struct device *dev, void *bus,
+ const struct occ_bus_ops *bus_ops);
+
+#endif /* __OCC_P8_H__ */
--
1.8.3.1
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