[RFC PATCH linux 5/9] hwmon: occ: Add callbacks for parsing P8 OCC datastructures
Andrew Jeffery
andrew at aj.id.au
Fri Nov 11 15:12:12 AEDT 2016
Signed-off-by: Andrew Jeffery <andrew at aj.id.au>
---
drivers/hwmon/occ/occ_p8.c | 219 +++++++++++++++++++++++++++++++++++++++++++++
drivers/hwmon/occ/occ_p8.h | 30 +++++++
2 files changed, 249 insertions(+)
create mode 100644 drivers/hwmon/occ/occ_p8.c
create mode 100644 drivers/hwmon/occ/occ_p8.h
diff --git a/drivers/hwmon/occ/occ_p8.c b/drivers/hwmon/occ/occ_p8.c
new file mode 100644
index 000000000000..b2fa0cb6eb28
--- /dev/null
+++ b/drivers/hwmon/occ/occ_p8.c
@@ -0,0 +1,219 @@
+/*
+ * p8.c - OCC hwmon driver
+ *
+ * This file contains the Power8-specific methods and data structures for
+ * the OCC hwmon driver.
+ *
+ * Copyright 2016 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+
+#include "occ.h"
+#include "occ_p8.h"
+
+/* P8 OCC sensor data format */
+struct occ_sensor_p8 {
+ u16 sensor_id;
+ u16 value;
+};
+
+struct power_sensor_p8 {
+ u16 sensor_id;
+ u32 update_tag;
+ u32 accumulator;
+ u16 value;
+};
+
+struct caps_sensor_p8 {
+ u16 curr_powercap;
+ u16 curr_powerreading;
+ u16 norm_powercap;
+ u16 max_powercap;
+ u16 min_powercap;
+ u16 user_powerlimit;
+};
+
+void p8_parse_sensor(u8 *data, void *sensor, int sensor_type, int off,
+ int snum)
+{
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ {
+ struct occ_sensor_p8 *os =
+ &(((struct occ_sensor_p8 *)sensor)[snum]);
+ os->sensor_id =
+ be16_to_cpup((const __be16 *)&data[off]);
+ os->value =
+ be16_to_cpup((const __be16 *)&data[off + 2]);
+ }
+ break;
+ case POWER:
+ {
+ struct power_sensor_p8 *ps =
+ &(((struct power_sensor_p8 *)sensor)[snum]);
+ ps->sensor_id =
+ be16_to_cpup((const __be16 *)&data[off]);
+ ps->update_tag =
+ be32_to_cpup((const __be32 *)&data[off + 2]);
+ ps->accumulator =
+ be32_to_cpup((const __be32 *)&data[off + 6]);
+ ps->value =
+ be16_to_cpup((const __be16 *)&data[off + 10]);
+ }
+ break;
+ case CAPS:
+ {
+ struct caps_sensor_p8 *cs =
+ &(((struct caps_sensor_p8 *)sensor)[snum]);
+ cs->curr_powercap =
+ be16_to_cpup((const __be16 *)&data[off]);
+ cs->curr_powerreading =
+ be16_to_cpup((const __be16 *)&data[off + 2]);
+ cs->norm_powercap =
+ be16_to_cpup((const __be16 *)&data[off + 4]);
+ cs->max_powercap =
+ be16_to_cpup((const __be16 *)&data[off + 6]);
+ cs->min_powercap =
+ be16_to_cpup((const __be16 *)&data[off + 8]);
+ cs->user_powerlimit =
+ be16_to_cpup((const __be16 *)&data[off + 10]);
+ }
+ break;
+ };
+}
+
+void * p8_alloc_sensor(int sensor_type, int num_sensors)
+{
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ return kcalloc(num_sensors,
+ sizeof(struct occ_sensor_p8),
+ GFP_KERNEL);
+ case POWER:
+ return kcalloc(num_sensors,
+ sizeof(struct power_sensor_p8),
+ GFP_KERNEL);
+ case CAPS:
+ return kcalloc(num_sensors,
+ sizeof(struct caps_sensor_p8),
+ GFP_KERNEL);
+ default:
+ return NULL;
+ }
+}
+
+int p8_get_sensor_value(struct occ *driver, int sensor_type, int snum)
+{
+ void *sensor;
+
+ if (sensor_type == CAPS)
+ return -1;
+
+ sensor = occ_get_sensor(driver, sensor_type);
+ if (!sensor)
+ return -1;
+
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ return ((struct occ_sensor_p8 *)sensor)[snum].value;
+ case POWER:
+ return ((struct power_sensor_p8 *)sensor)[snum].value;
+ default:
+ return -1;
+ }
+}
+
+int p8_get_sensor_id(struct occ *driver, int sensor_type, int snum)
+{
+ void *sensor;
+ int i = snum;
+
+ if (sensor_type == CAPS)
+ return -1;
+
+ sensor = occ_get_sensor(driver, sensor_type);
+ if (!sensor)
+ return -1;
+
+ switch (sensor_type) {
+ case FREQ:
+ case TEMP:
+ return ((struct occ_sensor_p8 *)sensor)[i].sensor_id;
+ case POWER:
+ return ((struct power_sensor_p8 *)sensor)[i].sensor_id;
+ default:
+ return -1;
+ }
+}
+
+int p8_get_caps_value(void *sensor, int snum, int caps_field)
+{
+ struct caps_sensor_p8 *caps_sensor = sensor;
+
+ switch (caps_field) {
+ case 0:
+ return caps_sensor[snum].curr_powercap;
+ case 1:
+ return caps_sensor[snum].curr_powerreading;
+ case 2:
+ return caps_sensor[snum].norm_powercap;
+ case 3:
+ return caps_sensor[snum].max_powercap;
+ case 4:
+ return caps_sensor[snum].min_powercap;
+ case 5:
+ return caps_sensor[snum].user_powerlimit;
+ default:
+ return -1;
+ }
+}
+
+static const struct occ_ops p8_ops = {
+ .parse_sensor = p8_parse_sensor,
+ .alloc_sensor = p8_alloc_sensor,
+ .get_sensor_value = p8_get_sensor_value,
+ .get_sensor_id = p8_get_sensor_id,
+ .get_caps_value = p8_get_caps_value,
+};
+
+static const struct occ_config p8_config = {
+ .command_addr = 0xFFFF6000,
+ .response_addr = 0xFFFF7000,
+};
+
+struct occ *occ_p8_start(struct device *dev, void *bus, struct occ_bus_ops bus_ops)
+{
+ return occ_start(dev, bus, bus_ops, p8_ops, p8_config);
+}
+EXPORT_SYMBOL(occ_p8_start);
+
+int occ_p8_stop(struct occ *occ)
+{
+ return occ_stop(occ);
+}
+EXPORT_SYMBOL(occ_p8_stop);
+
+MODULE_AUTHOR("Eddie James <eajames at us.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 000000000000..acae34323a6b
--- /dev/null
+++ b/drivers/hwmon/occ/occ_p8.h
@@ -0,0 +1,30 @@
+/*
+ * p8.h - OCC hwmon driver
+ *
+ * This file contains Power8-specific function prototypes
+ *
+ * Copyright 2016 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __P8_H__
+#define __P8_H__
+
+#include "scom.h"
+
+struct device;
+
+struct occ *occ_p8_start(struct device *dev, void *bus,
+ struct occ_bus_ops bus_ops);
+int occ_p8_stop(struct occ *occ);
+
+#endif /* __P8_H__ */
--
2.9.3
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