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/* Copyright 2013-2015 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <xscom.h>
#include <chip.h>
#include <sensor.h>
#include <dts.h>
#include <skiboot.h>
/* Per core Digital Thermal Sensors */
#define EX_THERM_DTS_RESULT0 0x10050000
#define EX_THERM_DTS_RESULT1 0x10050001
/* Per core Digital Thermal Sensors control registers */
#define EX_THERM_MODE_REG 0x1005000F
#define EX_THERM_CONTROL_REG 0x10050012
#define EX_THERM_ERR_STATUS_REG 0x10050013
struct dts {
uint8_t valid;
uint8_t trip;
int16_t temp;
};
/* Therm mac result masking for DTS (result(0:15)
* 0:3 - 0x0
* 4:11 - Temperature in degrees C
* 12:13 - trip bits: 00 - no trip; 01 - warning; 10 - critical; 11 - fatal
* 14 - spare
* 15 - valid
*/
static void dts_decode_one_dts(uint16_t raw, struct dts *dts)
{
/*
* The value is both signed and unsigned :-) 0xff could be
* either 255C or -1C, so for now we treat this as unsigned
* which is sufficient for our purpose. We could try to be
* a bit smarter and treat it as signed for values between
* -10 and 0 and unsigned to 239 or something like that...
*/
dts->valid = raw & 1;
if (dts->valid) {
dts->temp = (raw >> 4) & 0xff;
dts->trip = (raw >> 2) & 0x3;
} else {
dts->temp = 0;
dts->trip = 0;
}
}
/* Different sensor locations */
#define P8_CT_ZONE_LSU 0
#define P8_CT_ZONE_ISU 1
#define P8_CT_ZONE_FXU 2
#define P8_CT_ZONE_L3C 3
#define P8_CT_ZONES 4
/*
* Returns the temperature as the max of all 4 zones and a global trip
* attribute.
*/
static int dts_read_core_temp(uint32_t pir, struct dts *dts)
{
int32_t chip_id = pir_to_chip_id(pir);
int32_t core = pir_to_core_id(pir);
uint64_t dts0, dts1;
struct dts temps[P8_CT_ZONES];
int i;
int rc;
rc = xscom_read(chip_id, XSCOM_ADDR_P8_EX(core, EX_THERM_DTS_RESULT0),
&dts0);
if (rc)
return rc;
rc = xscom_read(chip_id, XSCOM_ADDR_P8_EX(core, EX_THERM_DTS_RESULT1),
&dts1);
if (rc)
return rc;
dts_decode_one_dts(dts0 >> 48, &temps[P8_CT_ZONE_LSU]);
dts_decode_one_dts(dts0 >> 32, &temps[P8_CT_ZONE_ISU]);
dts_decode_one_dts(dts0 >> 16, &temps[P8_CT_ZONE_FXU]);
dts_decode_one_dts(dts1 >> 48, &temps[P8_CT_ZONE_L3C]);
for (i = 0; i < P8_CT_ZONES; i++) {
int16_t t = temps[i].temp;
if (!temps[i].valid)
continue;
/* keep the max temperature of all 4 sensors */
if (t > dts->temp)
dts->temp = t;
dts->valid++;
dts->trip |= temps[i].trip;
}
prlog(PR_TRACE, "DTS: Chip %x Core %x temp:%dC trip:%x\n",
chip_id, core, dts->temp, dts->trip);
return 0;
}
/*
* DTS sensor class ids. Only one for the moment: the core
* temperature.
*/
enum sensor_dts_class {
SENSOR_DTS_CORE_TEMP,
/* To be continued */
};
/*
* Attributes for the core temperature sensor
*/
enum {
SENSOR_DTS_ATTR_TEMP_MAX,
SENSOR_DTS_ATTR_TEMP_TRIP
};
int64_t dts_sensor_read(uint32_t sensor_hndl, uint32_t *sensor_data)
{
uint8_t attr = sensor_get_attr(sensor_hndl);
uint32_t rid = sensor_get_rid(sensor_hndl);
struct dts dts;
int64_t rc;
if (attr > SENSOR_DTS_ATTR_TEMP_TRIP)
return OPAL_PARAMETER;
memset(&dts, 0, sizeof(struct dts));
switch (sensor_get_frc(sensor_hndl) & ~SENSOR_DTS) {
case SENSOR_DTS_CORE_TEMP:
rc = dts_read_core_temp(rid, &dts);
break;
default:
rc = OPAL_PARAMETER;
break;
}
if (rc)
return rc;
if (attr == SENSOR_DTS_ATTR_TEMP_MAX)
*sensor_data = dts.temp;
else if (attr == SENSOR_DTS_ATTR_TEMP_TRIP)
*sensor_data = dts.trip;
return 0;
}
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