--- /dev/null
+/*
+ * intel_soc_dts_iosf.c
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <asm/iosf_mbi.h>
+#include "intel_soc_dts_iosf.h"
+
+#define SOC_DTS_OFFSET_ENABLE 0xB0
+#define SOC_DTS_OFFSET_TEMP 0xB1
+
+#define SOC_DTS_OFFSET_PTPS 0xB2
+#define SOC_DTS_OFFSET_PTTS 0xB3
+#define SOC_DTS_OFFSET_PTTSS 0xB4
+#define SOC_DTS_OFFSET_PTMC 0x80
+#define SOC_DTS_TE_AUX0 0xB5
+#define SOC_DTS_TE_AUX1 0xB6
+
+#define SOC_DTS_AUX0_ENABLE_BIT BIT(0)
+#define SOC_DTS_AUX1_ENABLE_BIT BIT(1)
+#define SOC_DTS_CPU_MODULE0_ENABLE_BIT BIT(16)
+#define SOC_DTS_CPU_MODULE1_ENABLE_BIT BIT(17)
+#define SOC_DTS_TE_SCI_ENABLE BIT(9)
+#define SOC_DTS_TE_SMI_ENABLE BIT(10)
+#define SOC_DTS_TE_MSI_ENABLE BIT(11)
+#define SOC_DTS_TE_APICA_ENABLE BIT(14)
+#define SOC_DTS_PTMC_APIC_DEASSERT_BIT BIT(4)
+
+/* DTS encoding for TJ MAX temperature */
+#define SOC_DTS_TJMAX_ENCODING 0x7F
+
+/* Only 2 out of 4 is allowed for OSPM */
+#define SOC_MAX_DTS_TRIPS 2
+
+/* Mask for two trips in status bits */
+#define SOC_DTS_TRIP_MASK 0x03
+
+/* DTS0 and DTS 1 */
+#define SOC_MAX_DTS_SENSORS 2
+
+static int get_tj_max(u32 *tj_max)
+{
+ u32 eax, edx;
+ u32 val;
+ int err;
+
+ err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
+ if (err)
+ goto err_ret;
+ else {
+ val = (eax >> 16) & 0xff;
+ if (val)
+ *tj_max = val * 1000;
+ else {
+ err = -EINVAL;
+ goto err_ret;
+ }
+ }
+
+ return 0;
+err_ret:
+ *tj_max = 0;
+
+ return err;
+}
+
+static int sys_get_trip_temp(struct thermal_zone_device *tzd, int trip,
+ int *temp)
+{
+ int status;
+ u32 out;
+ struct intel_soc_dts_sensor_entry *dts;
+ struct intel_soc_dts_sensors *sensors;
+
+ dts = tzd->devdata;
+ sensors = dts->sensors;
+ mutex_lock(&sensors->dts_update_lock);
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_PTPS, &out);
+ mutex_unlock(&sensors->dts_update_lock);
+ if (status)
+ return status;
+
+ out = (out >> (trip * 8)) & SOC_DTS_TJMAX_ENCODING;
+ if (!out)
+ *temp = 0;
+ else
+ *temp = sensors->tj_max - out * 1000;
+
+ return 0;
+}
+
+static int update_trip_temp(struct intel_soc_dts_sensor_entry *dts,
+ int thres_index, int temp,
+ enum thermal_trip_type trip_type)
+{
+ int status;
+ u32 temp_out;
+ u32 out;
+ u32 store_ptps;
+ u32 store_ptmc;
+ u32 store_te_out;
+ u32 te_out;
+ u32 int_enable_bit = SOC_DTS_TE_APICA_ENABLE;
+ struct intel_soc_dts_sensors *sensors = dts->sensors;
+
+ if (sensors->intr_type == INTEL_SOC_DTS_INTERRUPT_MSI)
+ int_enable_bit |= SOC_DTS_TE_MSI_ENABLE;
+
+ temp_out = (sensors->tj_max - temp) / 1000;
+
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_PTPS, &store_ptps);
+ if (status)
+ return status;
+
+ out = (store_ptps & ~(0xFF << (thres_index * 8)));
+ out |= (temp_out & 0xFF) << (thres_index * 8);
+ status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTPS, out);
+ if (status)
+ return status;
+
+ pr_debug("update_trip_temp PTPS = %x\n", out);
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_PTMC, &out);
+ if (status)
+ goto err_restore_ptps;
+
+ store_ptmc = out;
+
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_TE_AUX0 + thres_index,
+ &te_out);
+ if (status)
+ goto err_restore_ptmc;
+
+ store_te_out = te_out;
+ /* Enable for CPU module 0 and module 1 */
+ out |= (SOC_DTS_CPU_MODULE0_ENABLE_BIT |
+ SOC_DTS_CPU_MODULE1_ENABLE_BIT);
+ if (temp) {
+ if (thres_index)
+ out |= SOC_DTS_AUX1_ENABLE_BIT;
+ else
+ out |= SOC_DTS_AUX0_ENABLE_BIT;
+ te_out |= int_enable_bit;
+ } else {
+ if (thres_index)
+ out &= ~SOC_DTS_AUX1_ENABLE_BIT;
+ else
+ out &= ~SOC_DTS_AUX0_ENABLE_BIT;
+ te_out &= ~int_enable_bit;
+ }
+ status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTMC, out);
+ if (status)
+ goto err_restore_te_out;
+
+ status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_TE_AUX0 + thres_index,
+ te_out);
+ if (status)
+ goto err_restore_te_out;
+
+ dts->trip_types[thres_index] = trip_type;
+
+ return 0;
+err_restore_te_out:
+ iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTMC, store_te_out);
+err_restore_ptmc:
+ iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTMC, store_ptmc);
+err_restore_ptps:
+ iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTPS, store_ptps);
+ /* Nothing we can do if restore fails */
+
+ return status;
+}
+
+static int sys_set_trip_temp(struct thermal_zone_device *tzd, int trip,
+ int temp)
+{
+ struct intel_soc_dts_sensor_entry *dts = tzd->devdata;
+ struct intel_soc_dts_sensors *sensors = dts->sensors;
+ int status;
+
+ if (temp > sensors->tj_max)
+ return -EINVAL;
+
+ mutex_lock(&sensors->dts_update_lock);
+ status = update_trip_temp(tzd->devdata, trip, temp,
+ dts->trip_types[trip]);
+ mutex_unlock(&sensors->dts_update_lock);
+
+ return status;
+}
+
+static int sys_get_trip_type(struct thermal_zone_device *tzd,
+ int trip, enum thermal_trip_type *type)
+{
+ struct intel_soc_dts_sensor_entry *dts;
+
+ dts = tzd->devdata;
+
+ *type = dts->trip_types[trip];
+
+ return 0;
+}
+
+static int sys_get_curr_temp(struct thermal_zone_device *tzd,
+ int *temp)
+{
+ int status;
+ u32 out;
+ struct intel_soc_dts_sensor_entry *dts;
+ struct intel_soc_dts_sensors *sensors;
+
+ dts = tzd->devdata;
+ sensors = dts->sensors;
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_TEMP, &out);
+ if (status)
+ return status;
+
+ out = (out & dts->temp_mask) >> dts->temp_shift;
+ out -= SOC_DTS_TJMAX_ENCODING;
+ *temp = sensors->tj_max - out * 1000;
+
+ return 0;
+}
+
+static struct thermal_zone_device_ops tzone_ops = {
+ .get_temp = sys_get_curr_temp,
+ .get_trip_temp = sys_get_trip_temp,
+ .get_trip_type = sys_get_trip_type,
+ .set_trip_temp = sys_set_trip_temp,
+};
+
+static int soc_dts_enable(int id)
+{
+ u32 out;
+ int ret;
+
+ ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_ENABLE, &out);
+ if (ret)
+ return ret;
+
+ if (!(out & BIT(id))) {
+ out |= BIT(id);
+ ret = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_ENABLE, out);
+ if (ret)
+ return ret;
+ }
+
+ return ret;
+}
+
+static void remove_dts_thermal_zone(struct intel_soc_dts_sensor_entry *dts)
+{
+ if (dts) {
+ iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_ENABLE, dts->store_status);
+ thermal_zone_device_unregister(dts->tzone);
+ }
+}
+
+static int add_dts_thermal_zone(int id, struct intel_soc_dts_sensor_entry *dts,
+ bool notification_support, int trip_cnt,
+ int read_only_trip_cnt)
+{
+ char name[10];
+ int trip_count = 0;
+ int trip_mask = 0;
+ u32 store_ptps;
+ int ret;
+ int i;
+
+ /* Store status to restor on exit */
+ ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_ENABLE,
+ &dts->store_status);
+ if (ret)
+ goto err_ret;
+
+ dts->id = id;
+ dts->temp_mask = 0x00FF << (id * 8);
+ dts->temp_shift = id * 8;
+ if (notification_support) {
+ trip_count = min(SOC_MAX_DTS_TRIPS, trip_cnt);
+ trip_mask = BIT(trip_count - read_only_trip_cnt) - 1;
+ }
+
+ /* Check if the writable trip we provide is not used by BIOS */
+ ret = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_PTPS, &store_ptps);
+ if (ret)
+ trip_mask = 0;
+ else {
+ for (i = 0; i < trip_count; ++i) {
+ if (trip_mask & BIT(i))
+ if (store_ptps & (0xff << (i * 8)))
+ trip_mask &= ~BIT(i);
+ }
+ }
+ dts->trip_mask = trip_mask;
+ dts->trip_count = trip_count;
+ snprintf(name, sizeof(name), "soc_dts%d", id);
+ dts->tzone = thermal_zone_device_register(name,
+ trip_count,
+ trip_mask,
+ dts, &tzone_ops,
+ NULL, 0, 0);
+ if (IS_ERR(dts->tzone)) {
+ ret = PTR_ERR(dts->tzone);
+ goto err_ret;
+ }
+
+ ret = soc_dts_enable(id);
+ if (ret)
+ goto err_enable;
+
+ return 0;
+err_enable:
+ thermal_zone_device_unregister(dts->tzone);
+err_ret:
+ return ret;
+}
+
+int intel_soc_dts_iosf_add_read_only_critical_trip(
+ struct intel_soc_dts_sensors *sensors, int critical_offset)
+{
+ int i, j;
+
+ for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
+ for (j = 0; j < sensors->soc_dts[i].trip_count; ++j) {
+ if (!(sensors->soc_dts[i].trip_mask & BIT(j))) {
+ return update_trip_temp(&sensors->soc_dts[i], j,
+ sensors->tj_max - critical_offset,
+ THERMAL_TRIP_CRITICAL);
+ }
+ }
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_add_read_only_critical_trip);
+
+void intel_soc_dts_iosf_interrupt_handler(struct intel_soc_dts_sensors *sensors)
+{
+ u32 sticky_out;
+ int status;
+ u32 ptmc_out;
+ unsigned long flags;
+
+ spin_lock_irqsave(&sensors->intr_notify_lock, flags);
+
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_PTMC, &ptmc_out);
+ ptmc_out |= SOC_DTS_PTMC_APIC_DEASSERT_BIT;
+ status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTMC, ptmc_out);
+
+ status = iosf_mbi_read(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_READ,
+ SOC_DTS_OFFSET_PTTSS, &sticky_out);
+ pr_debug("status %d PTTSS %x\n", status, sticky_out);
+ if (sticky_out & SOC_DTS_TRIP_MASK) {
+ int i;
+ /* reset sticky bit */
+ status = iosf_mbi_write(BT_MBI_UNIT_PMC, BT_MBI_BUNIT_WRITE,
+ SOC_DTS_OFFSET_PTTSS, sticky_out);
+ spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
+
+ for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
+ pr_debug("TZD update for zone %d\n", i);
+ thermal_zone_device_update(sensors->soc_dts[i].tzone);
+ }
+ } else
+ spin_unlock_irqrestore(&sensors->intr_notify_lock, flags);
+}
+EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_interrupt_handler);
+
+struct intel_soc_dts_sensors *intel_soc_dts_iosf_init(
+ enum intel_soc_dts_interrupt_type intr_type, int trip_count,
+ int read_only_trip_count)
+{
+ struct intel_soc_dts_sensors *sensors;
+ bool notification;
+ u32 tj_max;
+ int ret;
+ int i;
+
+ if (!iosf_mbi_available())
+ return ERR_PTR(-ENODEV);
+
+ if (!trip_count || read_only_trip_count > trip_count)
+ return ERR_PTR(-EINVAL);
+
+ if (get_tj_max(&tj_max))
+ return ERR_PTR(-EINVAL);
+
+ sensors = kzalloc(sizeof(*sensors), GFP_KERNEL);
+ if (!sensors)
+ return ERR_PTR(-ENOMEM);
+
+ spin_lock_init(&sensors->intr_notify_lock);
+ mutex_init(&sensors->dts_update_lock);
+ sensors->intr_type = intr_type;
+ sensors->tj_max = tj_max;
+ if (intr_type == INTEL_SOC_DTS_INTERRUPT_NONE)
+ notification = false;
+ else
+ notification = true;
+ for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
+ sensors->soc_dts[i].sensors = sensors;
+ ret = add_dts_thermal_zone(i, &sensors->soc_dts[i],
+ notification, trip_count,
+ read_only_trip_count);
+ if (ret)
+ goto err_free;
+ }
+
+ for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
+ ret = update_trip_temp(&sensors->soc_dts[i], 0, 0,
+ THERMAL_TRIP_PASSIVE);
+ if (ret)
+ goto err_remove_zone;
+
+ ret = update_trip_temp(&sensors->soc_dts[i], 1, 0,
+ THERMAL_TRIP_PASSIVE);
+ if (ret)
+ goto err_remove_zone;
+ }
+
+ return sensors;
+err_remove_zone:
+ for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i)
+ remove_dts_thermal_zone(&sensors->soc_dts[i]);
+
+err_free:
+ kfree(sensors);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_init);
+
+void intel_soc_dts_iosf_exit(struct intel_soc_dts_sensors *sensors)
+{
+ int i;
+
+ for (i = 0; i < SOC_MAX_DTS_SENSORS; ++i) {
+ update_trip_temp(&sensors->soc_dts[i], 0, 0, 0);
+ update_trip_temp(&sensors->soc_dts[i], 1, 0, 0);
+ remove_dts_thermal_zone(&sensors->soc_dts[i]);
+ }
+ kfree(sensors);
+}
+EXPORT_SYMBOL_GPL(intel_soc_dts_iosf_exit);
+
+MODULE_LICENSE("GPL v2");
Code Review / kvmfornfv.git / blobdiff