WIP FPC-III support

[linux/fpc-iii.git] / drivers / thermal / tegra / soctherm.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2014 - 2018, NVIDIA CORPORATION.  All rights reserved.
 *
 * Author:
 *      Mikko Perttunen <mperttunen@nvidia.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * 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/debugfs.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/thermal.h>

#include <dt-bindings/thermal/tegra124-soctherm.h>

#include "../thermal_core.h"
#include "soctherm.h"

#define SENSOR_CONFIG0                          0
#define SENSOR_CONFIG0_STOP                     BIT(0)
#define SENSOR_CONFIG0_CPTR_OVER                BIT(2)
#define SENSOR_CONFIG0_OVER                     BIT(3)
#define SENSOR_CONFIG0_TCALC_OVER               BIT(4)
#define SENSOR_CONFIG0_TALL_MASK                (0xfffff << 8)
#define SENSOR_CONFIG0_TALL_SHIFT               8

#define SENSOR_CONFIG1                          4
#define SENSOR_CONFIG1_TSAMPLE_MASK             0x3ff
#define SENSOR_CONFIG1_TSAMPLE_SHIFT            0
#define SENSOR_CONFIG1_TIDDQ_EN_MASK            (0x3f << 15)
#define SENSOR_CONFIG1_TIDDQ_EN_SHIFT           15
#define SENSOR_CONFIG1_TEN_COUNT_MASK           (0x3f << 24)
#define SENSOR_CONFIG1_TEN_COUNT_SHIFT          24
#define SENSOR_CONFIG1_TEMP_ENABLE              BIT(31)

/*
 * SENSOR_CONFIG2 is defined in soctherm.h
 * because, it will be used by tegra_soctherm_fuse.c
 */

#define SENSOR_STATUS0                          0xc
#define SENSOR_STATUS0_VALID_MASK               BIT(31)
#define SENSOR_STATUS0_CAPTURE_MASK             0xffff

#define SENSOR_STATUS1                          0x10
#define SENSOR_STATUS1_TEMP_VALID_MASK          BIT(31)
#define SENSOR_STATUS1_TEMP_MASK                0xffff

#define READBACK_VALUE_MASK                     0xff00
#define READBACK_VALUE_SHIFT                    8
#define READBACK_ADD_HALF                       BIT(7)
#define READBACK_NEGATE                         BIT(0)

/*
 * THERMCTL_LEVEL0_GROUP_CPU is defined in soctherm.h
 * because it will be used by tegraxxx_soctherm.c
 */
#define THERMCTL_LVL0_CPU0_EN_MASK              BIT(8)
#define THERMCTL_LVL0_CPU0_CPU_THROT_MASK       (0x3 << 5)
#define THERMCTL_LVL0_CPU0_CPU_THROT_LIGHT      0x1
#define THERMCTL_LVL0_CPU0_CPU_THROT_HEAVY      0x2
#define THERMCTL_LVL0_CPU0_GPU_THROT_MASK       (0x3 << 3)
#define THERMCTL_LVL0_CPU0_GPU_THROT_LIGHT      0x1
#define THERMCTL_LVL0_CPU0_GPU_THROT_HEAVY      0x2
#define THERMCTL_LVL0_CPU0_MEM_THROT_MASK       BIT(2)
#define THERMCTL_LVL0_CPU0_STATUS_MASK          0x3

#define THERMCTL_LVL0_UP_STATS                  0x10
#define THERMCTL_LVL0_DN_STATS                  0x14

#define THERMCTL_INTR_STATUS                    0x84

#define TH_INTR_MD0_MASK                        BIT(25)
#define TH_INTR_MU0_MASK                        BIT(24)
#define TH_INTR_GD0_MASK                        BIT(17)
#define TH_INTR_GU0_MASK                        BIT(16)
#define TH_INTR_CD0_MASK                        BIT(9)
#define TH_INTR_CU0_MASK                        BIT(8)
#define TH_INTR_PD0_MASK                        BIT(1)
#define TH_INTR_PU0_MASK                        BIT(0)
#define TH_INTR_IGNORE_MASK                     0xFCFCFCFC

#define THERMCTL_STATS_CTL                      0x94
#define STATS_CTL_CLR_DN                        0x8
#define STATS_CTL_EN_DN                         0x4
#define STATS_CTL_CLR_UP                        0x2
#define STATS_CTL_EN_UP                         0x1

#define OC1_CFG                                 0x310
#define OC1_CFG_LONG_LATENCY_MASK               BIT(6)
#define OC1_CFG_HW_RESTORE_MASK                 BIT(5)
#define OC1_CFG_PWR_GOOD_MASK_MASK              BIT(4)
#define OC1_CFG_THROTTLE_MODE_MASK              (0x3 << 2)
#define OC1_CFG_ALARM_POLARITY_MASK             BIT(1)
#define OC1_CFG_EN_THROTTLE_MASK                BIT(0)

#define OC1_CNT_THRESHOLD                       0x314
#define OC1_THROTTLE_PERIOD                     0x318
#define OC1_ALARM_COUNT                         0x31c
#define OC1_FILTER                              0x320
#define OC1_STATS                               0x3a8

#define OC_INTR_STATUS                          0x39c
#define OC_INTR_ENABLE                          0x3a0
#define OC_INTR_DISABLE                         0x3a4
#define OC_STATS_CTL                            0x3c4
#define OC_STATS_CTL_CLR_ALL                    0x2
#define OC_STATS_CTL_EN_ALL                     0x1

#define OC_INTR_OC1_MASK                        BIT(0)
#define OC_INTR_OC2_MASK                        BIT(1)
#define OC_INTR_OC3_MASK                        BIT(2)
#define OC_INTR_OC4_MASK                        BIT(3)
#define OC_INTR_OC5_MASK                        BIT(4)

#define THROT_GLOBAL_CFG                        0x400
#define THROT_GLOBAL_ENB_MASK                   BIT(0)

#define CPU_PSKIP_STATUS                        0x418
#define XPU_PSKIP_STATUS_M_MASK                 (0xff << 12)
#define XPU_PSKIP_STATUS_N_MASK                 (0xff << 4)
#define XPU_PSKIP_STATUS_SW_OVERRIDE_MASK       BIT(1)
#define XPU_PSKIP_STATUS_ENABLED_MASK           BIT(0)

#define THROT_PRIORITY_LOCK                     0x424
#define THROT_PRIORITY_LOCK_PRIORITY_MASK       0xff

#define THROT_STATUS                            0x428
#define THROT_STATUS_BREACH_MASK                BIT(12)
#define THROT_STATUS_STATE_MASK                 (0xff << 4)
#define THROT_STATUS_ENABLED_MASK               BIT(0)

#define THROT_PSKIP_CTRL_LITE_CPU               0x430
#define THROT_PSKIP_CTRL_ENABLE_MASK            BIT(31)
#define THROT_PSKIP_CTRL_DIVIDEND_MASK          (0xff << 8)
#define THROT_PSKIP_CTRL_DIVISOR_MASK           0xff
#define THROT_PSKIP_CTRL_VECT_GPU_MASK          (0x7 << 16)
#define THROT_PSKIP_CTRL_VECT_CPU_MASK          (0x7 << 8)
#define THROT_PSKIP_CTRL_VECT2_CPU_MASK         0x7

#define THROT_VECT_NONE                         0x0 /* 3'b000 */
#define THROT_VECT_LOW                          0x1 /* 3'b001 */
#define THROT_VECT_MED                          0x3 /* 3'b011 */
#define THROT_VECT_HIGH                         0x7 /* 3'b111 */

#define THROT_PSKIP_RAMP_LITE_CPU               0x434
#define THROT_PSKIP_RAMP_SEQ_BYPASS_MODE_MASK   BIT(31)
#define THROT_PSKIP_RAMP_DURATION_MASK          (0xffff << 8)
#define THROT_PSKIP_RAMP_STEP_MASK              0xff

#define THROT_PRIORITY_LITE                     0x444
#define THROT_PRIORITY_LITE_PRIO_MASK           0xff

#define THROT_DELAY_LITE                        0x448
#define THROT_DELAY_LITE_DELAY_MASK             0xff

/* car register offsets needed for enabling HW throttling */
#define CAR_SUPER_CCLKG_DIVIDER                 0x36c
#define CDIVG_USE_THERM_CONTROLS_MASK           BIT(30)

/* ccroc register offsets needed for enabling HW throttling for Tegra132 */
#define CCROC_SUPER_CCLKG_DIVIDER               0x024

#define CCROC_GLOBAL_CFG                        0x148

#define CCROC_THROT_PSKIP_RAMP_CPU              0x150
#define CCROC_THROT_PSKIP_RAMP_SEQ_BYPASS_MODE_MASK     BIT(31)
#define CCROC_THROT_PSKIP_RAMP_DURATION_MASK    (0xffff << 8)
#define CCROC_THROT_PSKIP_RAMP_STEP_MASK        0xff

#define CCROC_THROT_PSKIP_CTRL_CPU              0x154
#define CCROC_THROT_PSKIP_CTRL_ENB_MASK         BIT(31)
#define CCROC_THROT_PSKIP_CTRL_DIVIDEND_MASK    (0xff << 8)
#define CCROC_THROT_PSKIP_CTRL_DIVISOR_MASK     0xff

/* get val from register(r) mask bits(m) */
#define REG_GET_MASK(r, m)      (((r) & (m)) >> (ffs(m) - 1))
/* set val(v) to mask bits(m) of register(r) */
#define REG_SET_MASK(r, m, v)   (((r) & ~(m)) | \
                                 (((v) & (m >> (ffs(m) - 1))) << (ffs(m) - 1)))

/* get dividend from the depth */
#define THROT_DEPTH_DIVIDEND(depth)     ((256 * (100 - (depth)) / 100) - 1)

/* gk20a nv_therm interface N:3 Mapping. Levels defined in tegra124-soctherm.h
 * level        vector
 * NONE         3'b000
 * LOW          3'b001
 * MED          3'b011
 * HIGH         3'b111
 */
#define THROT_LEVEL_TO_DEPTH(level)     ((0x1 << (level)) - 1)

/* get THROT_PSKIP_xxx offset per LIGHT/HEAVY throt and CPU/GPU dev */
#define THROT_OFFSET                    0x30
#define THROT_PSKIP_CTRL(throt, dev)    (THROT_PSKIP_CTRL_LITE_CPU + \
                                        (THROT_OFFSET * throt) + (8 * dev))
#define THROT_PSKIP_RAMP(throt, dev)    (THROT_PSKIP_RAMP_LITE_CPU + \
                                        (THROT_OFFSET * throt) + (8 * dev))

/* get THROT_xxx_CTRL offset per LIGHT/HEAVY throt */
#define THROT_PRIORITY_CTRL(throt)      (THROT_PRIORITY_LITE + \
                                        (THROT_OFFSET * throt))
#define THROT_DELAY_CTRL(throt)         (THROT_DELAY_LITE + \
                                        (THROT_OFFSET * throt))

#define ALARM_OFFSET                    0x14
#define ALARM_CFG(throt)                (OC1_CFG + \
                                        (ALARM_OFFSET * (throt - THROTTLE_OC1)))

#define ALARM_CNT_THRESHOLD(throt)      (OC1_CNT_THRESHOLD + \
                                        (ALARM_OFFSET * (throt - THROTTLE_OC1)))

#define ALARM_THROTTLE_PERIOD(throt)    (OC1_THROTTLE_PERIOD + \
                                        (ALARM_OFFSET * (throt - THROTTLE_OC1)))

#define ALARM_ALARM_COUNT(throt)        (OC1_ALARM_COUNT + \
                                        (ALARM_OFFSET * (throt - THROTTLE_OC1)))

#define ALARM_FILTER(throt)             (OC1_FILTER + \
                                        (ALARM_OFFSET * (throt - THROTTLE_OC1)))

#define ALARM_STATS(throt)              (OC1_STATS + \
                                        (4 * (throt - THROTTLE_OC1)))

/* get CCROC_THROT_PSKIP_xxx offset per HIGH/MED/LOW vect*/
#define CCROC_THROT_OFFSET                      0x0c
#define CCROC_THROT_PSKIP_CTRL_CPU_REG(vect)    (CCROC_THROT_PSKIP_CTRL_CPU + \
                                                (CCROC_THROT_OFFSET * vect))
#define CCROC_THROT_PSKIP_RAMP_CPU_REG(vect)    (CCROC_THROT_PSKIP_RAMP_CPU + \
                                                (CCROC_THROT_OFFSET * vect))

/* get THERMCTL_LEVELx offset per CPU/GPU/MEM/TSENSE rg and LEVEL0~3 lv */
#define THERMCTL_LVL_REGS_SIZE          0x20
#define THERMCTL_LVL_REG(rg, lv)        ((rg) + ((lv) * THERMCTL_LVL_REGS_SIZE))

#define OC_THROTTLE_MODE_DISABLED       0
#define OC_THROTTLE_MODE_BRIEF          2

static const int min_low_temp = -127000;
static const int max_high_temp = 127000;

enum soctherm_throttle_id {
        THROTTLE_LIGHT = 0,
        THROTTLE_HEAVY,
        THROTTLE_OC1,
        THROTTLE_OC2,
        THROTTLE_OC3,
        THROTTLE_OC4,
        THROTTLE_OC5, /* OC5 is reserved */
        THROTTLE_SIZE,
};

enum soctherm_oc_irq_id {
        TEGRA_SOC_OC_IRQ_1,
        TEGRA_SOC_OC_IRQ_2,
        TEGRA_SOC_OC_IRQ_3,
        TEGRA_SOC_OC_IRQ_4,
        TEGRA_SOC_OC_IRQ_5,
        TEGRA_SOC_OC_IRQ_MAX,
};

enum soctherm_throttle_dev_id {
        THROTTLE_DEV_CPU = 0,
        THROTTLE_DEV_GPU,
        THROTTLE_DEV_SIZE,
};

static const char *const throt_names[] = {
        [THROTTLE_LIGHT] = "light",
        [THROTTLE_HEAVY] = "heavy",
        [THROTTLE_OC1]   = "oc1",
        [THROTTLE_OC2]   = "oc2",
        [THROTTLE_OC3]   = "oc3",
        [THROTTLE_OC4]   = "oc4",
        [THROTTLE_OC5]   = "oc5",
};

struct tegra_soctherm;
struct tegra_thermctl_zone {
        void __iomem *reg;
        struct device *dev;
        struct tegra_soctherm *ts;
        struct thermal_zone_device *tz;
        const struct tegra_tsensor_group *sg;
};

struct soctherm_oc_cfg {
        u32 active_low;
        u32 throt_period;
        u32 alarm_cnt_thresh;
        u32 alarm_filter;
        u32 mode;
        bool intr_en;
};

struct soctherm_throt_cfg {
        const char *name;
        unsigned int id;
        u8 priority;
        u8 cpu_throt_level;
        u32 cpu_throt_depth;
        u32 gpu_throt_level;
        struct soctherm_oc_cfg oc_cfg;
        struct thermal_cooling_device *cdev;
        bool init;
};

struct tegra_soctherm {
        struct reset_control *reset;
        struct clk *clock_tsensor;
        struct clk *clock_soctherm;
        void __iomem *regs;
        void __iomem *clk_regs;
        void __iomem *ccroc_regs;

        int thermal_irq;
        int edp_irq;

        u32 *calib;
        struct thermal_zone_device **thermctl_tzs;
        struct tegra_soctherm_soc *soc;

        struct soctherm_throt_cfg throt_cfgs[THROTTLE_SIZE];

        struct dentry *debugfs_dir;

        struct mutex thermctl_lock;
};

struct soctherm_oc_irq_chip_data {
        struct mutex            irq_lock; /* serialize OC IRQs */
        struct irq_chip         irq_chip;
        struct irq_domain       *domain;
        int                     irq_enable;
};

static struct soctherm_oc_irq_chip_data soc_irq_cdata;

/**
 * ccroc_writel() - writes a value to a CCROC register
 * @ts: pointer to a struct tegra_soctherm
 * @value: the value to write
 * @reg: the register offset
 *
 * Writes @v to @reg.  No return value.
 */
static inline void ccroc_writel(struct tegra_soctherm *ts, u32 value, u32 reg)
{
        writel(value, (ts->ccroc_regs + reg));
}

/**
 * ccroc_readl() - reads specified register from CCROC IP block
 * @ts: pointer to a struct tegra_soctherm
 * @reg: register address to be read
 *
 * Return: the value of the register
 */
static inline u32 ccroc_readl(struct tegra_soctherm *ts, u32 reg)
{
        return readl(ts->ccroc_regs + reg);
}

static void enable_tsensor(struct tegra_soctherm *tegra, unsigned int i)
{
        const struct tegra_tsensor *sensor = &tegra->soc->tsensors[i];
        void __iomem *base = tegra->regs + sensor->base;
        unsigned int val;

        val = sensor->config->tall << SENSOR_CONFIG0_TALL_SHIFT;
        writel(val, base + SENSOR_CONFIG0);

        val  = (sensor->config->tsample - 1) << SENSOR_CONFIG1_TSAMPLE_SHIFT;
        val |= sensor->config->tiddq_en << SENSOR_CONFIG1_TIDDQ_EN_SHIFT;
        val |= sensor->config->ten_count << SENSOR_CONFIG1_TEN_COUNT_SHIFT;
        val |= SENSOR_CONFIG1_TEMP_ENABLE;
        writel(val, base + SENSOR_CONFIG1);

        writel(tegra->calib[i], base + SENSOR_CONFIG2);
}

/*
 * Translate from soctherm readback format to millicelsius.
 * The soctherm readback format in bits is as follows:
 *   TTTTTTTT H______N
 * where T's contain the temperature in Celsius,
 * H denotes an addition of 0.5 Celsius and N denotes negation
 * of the final value.
 */
static int translate_temp(u16 val)
{
        int t;

        t = ((val & READBACK_VALUE_MASK) >> READBACK_VALUE_SHIFT) * 1000;
        if (val & READBACK_ADD_HALF)
                t += 500;
        if (val & READBACK_NEGATE)
                t *= -1;

        return t;
}

static int tegra_thermctl_get_temp(void *data, int *out_temp)
{
        struct tegra_thermctl_zone *zone = data;
        u32 val;

        val = readl(zone->reg);
        val = REG_GET_MASK(val, zone->sg->sensor_temp_mask);
        *out_temp = translate_temp(val);

        return 0;
}

/**
 * enforce_temp_range() - check and enforce temperature range [min, max]
 * @dev: struct device * of the SOC_THERM instance
 * @trip_temp: the trip temperature to check
 *
 * Checks and enforces the permitted temperature range that SOC_THERM
 * HW can support This is
 * done while taking care of precision.
 *
 * Return: The precision adjusted capped temperature in millicelsius.
 */
static int enforce_temp_range(struct device *dev, int trip_temp)
{
        int temp;

        temp = clamp_val(trip_temp, min_low_temp, max_high_temp);
        if (temp != trip_temp)
                dev_info(dev, "soctherm: trip temperature %d forced to %d\n",
                         trip_temp, temp);
        return temp;
}

/**
 * thermtrip_program() - Configures the hardware to shut down the
 * system if a given sensor group reaches a given temperature
 * @dev: ptr to the struct device for the SOC_THERM IP block
 * @sg: pointer to the sensor group to set the thermtrip temperature for
 * @trip_temp: the temperature in millicelsius to trigger the thermal trip at
 *
 * Sets the thermal trip threshold of the given sensor group to be the
 * @trip_temp.  If this threshold is crossed, the hardware will shut
 * down.
 *
 * Note that, although @trip_temp is specified in millicelsius, the
 * hardware is programmed in degrees Celsius.
 *
 * Return: 0 upon success, or %-EINVAL upon failure.
 */
static int thermtrip_program(struct device *dev,
                             const struct tegra_tsensor_group *sg,
                             int trip_temp)
{
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        int temp;
        u32 r;

        if (!sg || !sg->thermtrip_threshold_mask)
                return -EINVAL;

        temp = enforce_temp_range(dev, trip_temp) / ts->soc->thresh_grain;

        r = readl(ts->regs + THERMCTL_THERMTRIP_CTL);
        r = REG_SET_MASK(r, sg->thermtrip_threshold_mask, temp);
        r = REG_SET_MASK(r, sg->thermtrip_enable_mask, 1);
        r = REG_SET_MASK(r, sg->thermtrip_any_en_mask, 0);
        writel(r, ts->regs + THERMCTL_THERMTRIP_CTL);

        return 0;
}

/**
 * throttrip_program() - Configures the hardware to throttle the
 * pulse if a given sensor group reaches a given temperature
 * @dev: ptr to the struct device for the SOC_THERM IP block
 * @sg: pointer to the sensor group to set the thermtrip temperature for
 * @stc: pointer to the throttle need to be triggered
 * @trip_temp: the temperature in millicelsius to trigger the thermal trip at
 *
 * Sets the thermal trip threshold and throttle event of the given sensor
 * group. If this threshold is crossed, the hardware will trigger the
 * throttle.
 *
 * Note that, although @trip_temp is specified in millicelsius, the
 * hardware is programmed in degrees Celsius.
 *
 * Return: 0 upon success, or %-EINVAL upon failure.
 */
static int throttrip_program(struct device *dev,
                             const struct tegra_tsensor_group *sg,
                             struct soctherm_throt_cfg *stc,
                             int trip_temp)
{
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        int temp, cpu_throt, gpu_throt;
        unsigned int throt;
        u32 r, reg_off;

        if (!sg || !stc || !stc->init)
                return -EINVAL;

        temp = enforce_temp_range(dev, trip_temp) / ts->soc->thresh_grain;

        /* Hardcode LIGHT on LEVEL1 and HEAVY on LEVEL2 */
        throt = stc->id;
        reg_off = THERMCTL_LVL_REG(sg->thermctl_lvl0_offset, throt + 1);

        if (throt == THROTTLE_LIGHT) {
                cpu_throt = THERMCTL_LVL0_CPU0_CPU_THROT_LIGHT;
                gpu_throt = THERMCTL_LVL0_CPU0_GPU_THROT_LIGHT;
        } else {
                cpu_throt = THERMCTL_LVL0_CPU0_CPU_THROT_HEAVY;
                gpu_throt = THERMCTL_LVL0_CPU0_GPU_THROT_HEAVY;
                if (throt != THROTTLE_HEAVY)
                        dev_warn(dev,
                                 "invalid throt id %d - assuming HEAVY",
                                 throt);
        }

        r = readl(ts->regs + reg_off);
        r = REG_SET_MASK(r, sg->thermctl_lvl0_up_thresh_mask, temp);
        r = REG_SET_MASK(r, sg->thermctl_lvl0_dn_thresh_mask, temp);
        r = REG_SET_MASK(r, THERMCTL_LVL0_CPU0_CPU_THROT_MASK, cpu_throt);
        r = REG_SET_MASK(r, THERMCTL_LVL0_CPU0_GPU_THROT_MASK, gpu_throt);
        r = REG_SET_MASK(r, THERMCTL_LVL0_CPU0_EN_MASK, 1);
        writel(r, ts->regs + reg_off);

        return 0;
}

static struct soctherm_throt_cfg *
find_throttle_cfg_by_name(struct tegra_soctherm *ts, const char *name)
{
        unsigned int i;

        for (i = 0; ts->throt_cfgs[i].name; i++)
                if (!strcmp(ts->throt_cfgs[i].name, name))
                        return &ts->throt_cfgs[i];

        return NULL;
}

static int tsensor_group_thermtrip_get(struct tegra_soctherm *ts, int id)
{
        int i, temp = min_low_temp;
        struct tsensor_group_thermtrips *tt = ts->soc->thermtrips;

        if (id >= TEGRA124_SOCTHERM_SENSOR_NUM)
                return temp;

        if (tt) {
                for (i = 0; i < ts->soc->num_ttgs; i++) {
                        if (tt[i].id == id)
                                return tt[i].temp;
                }
        }

        return temp;
}

static int tegra_thermctl_set_trip_temp(void *data, int trip, int temp)
{
        struct tegra_thermctl_zone *zone = data;
        struct thermal_zone_device *tz = zone->tz;
        struct tegra_soctherm *ts = zone->ts;
        const struct tegra_tsensor_group *sg = zone->sg;
        struct device *dev = zone->dev;
        enum thermal_trip_type type;
        int ret;

        if (!tz)
                return -EINVAL;

        ret = tz->ops->get_trip_type(tz, trip, &type);
        if (ret)
                return ret;

        if (type == THERMAL_TRIP_CRITICAL) {
                /*
                 * If thermtrips property is set in DT,
                 * doesn't need to program critical type trip to HW,
                 * if not, program critical trip to HW.
                 */
                if (min_low_temp == tsensor_group_thermtrip_get(ts, sg->id))
                        return thermtrip_program(dev, sg, temp);
                else
                        return 0;

        } else if (type == THERMAL_TRIP_HOT) {
                int i;

                for (i = 0; i < THROTTLE_SIZE; i++) {
                        struct thermal_cooling_device *cdev;
                        struct soctherm_throt_cfg *stc;

                        if (!ts->throt_cfgs[i].init)
                                continue;

                        cdev = ts->throt_cfgs[i].cdev;
                        if (get_thermal_instance(tz, cdev, trip))
                                stc = find_throttle_cfg_by_name(ts, cdev->type);
                        else
                                continue;

                        return throttrip_program(dev, sg, stc, temp);
                }
        }

        return 0;
}

static int tegra_thermctl_get_trend(void *data, int trip,
                                    enum thermal_trend *trend)
{
        struct tegra_thermctl_zone *zone = data;
        struct thermal_zone_device *tz = zone->tz;
        int trip_temp, temp, last_temp, ret;

        if (!tz)
                return -EINVAL;

        ret = tz->ops->get_trip_temp(zone->tz, trip, &trip_temp);
        if (ret)
                return ret;

        temp = READ_ONCE(tz->temperature);
        last_temp = READ_ONCE(tz->last_temperature);

        if (temp > trip_temp) {
                if (temp >= last_temp)
                        *trend = THERMAL_TREND_RAISING;
                else
                        *trend = THERMAL_TREND_STABLE;
        } else if (temp < trip_temp) {
                *trend = THERMAL_TREND_DROPPING;
        } else {
                *trend = THERMAL_TREND_STABLE;
        }

        return 0;
}

static void thermal_irq_enable(struct tegra_thermctl_zone *zn)
{
        u32 r;

        /* multiple zones could be handling and setting trips at once */
        mutex_lock(&zn->ts->thermctl_lock);
        r = readl(zn->ts->regs + THERMCTL_INTR_ENABLE);
        r = REG_SET_MASK(r, zn->sg->thermctl_isr_mask, TH_INTR_UP_DN_EN);
        writel(r, zn->ts->regs + THERMCTL_INTR_ENABLE);
        mutex_unlock(&zn->ts->thermctl_lock);
}

static void thermal_irq_disable(struct tegra_thermctl_zone *zn)
{
        u32 r;

        /* multiple zones could be handling and setting trips at once */
        mutex_lock(&zn->ts->thermctl_lock);
        r = readl(zn->ts->regs + THERMCTL_INTR_DISABLE);
        r = REG_SET_MASK(r, zn->sg->thermctl_isr_mask, 0);
        writel(r, zn->ts->regs + THERMCTL_INTR_DISABLE);
        mutex_unlock(&zn->ts->thermctl_lock);
}

static int tegra_thermctl_set_trips(void *data, int lo, int hi)
{
        struct tegra_thermctl_zone *zone = data;
        u32 r;

        thermal_irq_disable(zone);

        r = readl(zone->ts->regs + zone->sg->thermctl_lvl0_offset);
        r = REG_SET_MASK(r, THERMCTL_LVL0_CPU0_EN_MASK, 0);
        writel(r, zone->ts->regs + zone->sg->thermctl_lvl0_offset);

        lo = enforce_temp_range(zone->dev, lo) / zone->ts->soc->thresh_grain;
        hi = enforce_temp_range(zone->dev, hi) / zone->ts->soc->thresh_grain;
        dev_dbg(zone->dev, "%s hi:%d, lo:%d\n", __func__, hi, lo);

        r = REG_SET_MASK(r, zone->sg->thermctl_lvl0_up_thresh_mask, hi);
        r = REG_SET_MASK(r, zone->sg->thermctl_lvl0_dn_thresh_mask, lo);
        r = REG_SET_MASK(r, THERMCTL_LVL0_CPU0_EN_MASK, 1);
        writel(r, zone->ts->regs + zone->sg->thermctl_lvl0_offset);

        thermal_irq_enable(zone);

        return 0;
}

static const struct thermal_zone_of_device_ops tegra_of_thermal_ops = {
        .get_temp = tegra_thermctl_get_temp,
        .set_trip_temp = tegra_thermctl_set_trip_temp,
        .get_trend = tegra_thermctl_get_trend,
        .set_trips = tegra_thermctl_set_trips,
};

static int get_hot_temp(struct thermal_zone_device *tz, int *trip, int *temp)
{
        int ntrips, i, ret;
        enum thermal_trip_type type;

        ntrips = of_thermal_get_ntrips(tz);
        if (ntrips <= 0)
                return -EINVAL;

        for (i = 0; i < ntrips; i++) {
                ret = tz->ops->get_trip_type(tz, i, &type);
                if (ret)
                        return -EINVAL;
                if (type == THERMAL_TRIP_HOT) {
                        ret = tz->ops->get_trip_temp(tz, i, temp);
                        if (!ret)
                                *trip = i;

                        return ret;
                }
        }

        return -EINVAL;
}

/**
 * tegra_soctherm_set_hwtrips() - set HW trip point from DT data
 * @dev: struct device * of the SOC_THERM instance
 * @sg: pointer to the sensor group to set the thermtrip temperature for
 * @tz: struct thermal_zone_device *
 *
 * Configure the SOC_THERM HW trip points, setting "THERMTRIP"
 * "THROTTLE" trip points , using "thermtrips", "critical" or "hot"
 * type trip_temp
 * from thermal zone.
 * After they have been configured, THERMTRIP or THROTTLE will take
 * action when the configured SoC thermal sensor group reaches a
 * certain temperature.
 *
 * Return: 0 upon success, or a negative error code on failure.
 * "Success" does not mean that trips was enabled; it could also
 * mean that no node was found in DT.
 * THERMTRIP has been enabled successfully when a message similar to
 * this one appears on the serial console:
 * "thermtrip: will shut down when sensor group XXX reaches YYYYYY mC"
 * THROTTLE has been enabled successfully when a message similar to
 * this one appears on the serial console:
 * ""throttrip: will throttle when sensor group XXX reaches YYYYYY mC"
 */
static int tegra_soctherm_set_hwtrips(struct device *dev,
                                      const struct tegra_tsensor_group *sg,
                                      struct thermal_zone_device *tz)
{
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        struct soctherm_throt_cfg *stc;
        int i, trip, temperature, ret;

        /* Get thermtrips. If missing, try to get critical trips. */
        temperature = tsensor_group_thermtrip_get(ts, sg->id);
        if (min_low_temp == temperature)
                if (tz->ops->get_crit_temp(tz, &temperature))
                        temperature = max_high_temp;

        ret = thermtrip_program(dev, sg, temperature);
        if (ret) {
                dev_err(dev, "thermtrip: %s: error during enable\n", sg->name);
                return ret;
        }

        dev_info(dev, "thermtrip: will shut down when %s reaches %d mC\n",
                 sg->name, temperature);

        ret = get_hot_temp(tz, &trip, &temperature);
        if (ret) {
                dev_info(dev, "throttrip: %s: missing hot temperature\n",
                         sg->name);
                return 0;
        }

        for (i = 0; i < THROTTLE_OC1; i++) {
                struct thermal_cooling_device *cdev;

                if (!ts->throt_cfgs[i].init)
                        continue;

                cdev = ts->throt_cfgs[i].cdev;
                if (get_thermal_instance(tz, cdev, trip))
                        stc = find_throttle_cfg_by_name(ts, cdev->type);
                else
                        continue;

                ret = throttrip_program(dev, sg, stc, temperature);
                if (ret) {
                        dev_err(dev, "throttrip: %s: error during enable\n",
                                sg->name);
                        return ret;
                }

                dev_info(dev,
                         "throttrip: will throttle when %s reaches %d mC\n",
                         sg->name, temperature);
                break;
        }

        if (i == THROTTLE_SIZE)
                dev_info(dev, "throttrip: %s: missing throttle cdev\n",
                         sg->name);

        return 0;
}

static irqreturn_t soctherm_thermal_isr(int irq, void *dev_id)
{
        struct tegra_soctherm *ts = dev_id;
        u32 r;

        /* Case for no lock:
         * Although interrupts are enabled in set_trips, there is still no need
         * to lock here because the interrupts are disabled before programming
         * new trip points. Hence there cant be a interrupt on the same sensor.
         * An interrupt can however occur on a sensor while trips are being
         * programmed on a different one. This beign a LEVEL interrupt won't
         * cause a new interrupt but this is taken care of by the re-reading of
         * the STATUS register in the thread function.
         */
        r = readl(ts->regs + THERMCTL_INTR_STATUS);
        writel(r, ts->regs + THERMCTL_INTR_DISABLE);

        return IRQ_WAKE_THREAD;
}

/**
 * soctherm_thermal_isr_thread() - Handles a thermal interrupt request
 * @irq:       The interrupt number being requested; not used
 * @dev_id:    Opaque pointer to tegra_soctherm;
 *
 * Clears the interrupt status register if there are expected
 * interrupt bits set.
 * The interrupt(s) are then handled by updating the corresponding
 * thermal zones.
 *
 * An error is logged if any unexpected interrupt bits are set.
 *
 * Disabled interrupts are re-enabled.
 *
 * Return: %IRQ_HANDLED. Interrupt was handled and no further processing
 * is needed.
 */
static irqreturn_t soctherm_thermal_isr_thread(int irq, void *dev_id)
{
        struct tegra_soctherm *ts = dev_id;
        struct thermal_zone_device *tz;
        u32 st, ex = 0, cp = 0, gp = 0, pl = 0, me = 0;

        st = readl(ts->regs + THERMCTL_INTR_STATUS);

        /* deliberately clear expected interrupts handled in SW */
        cp |= st & TH_INTR_CD0_MASK;
        cp |= st & TH_INTR_CU0_MASK;

        gp |= st & TH_INTR_GD0_MASK;
        gp |= st & TH_INTR_GU0_MASK;

        pl |= st & TH_INTR_PD0_MASK;
        pl |= st & TH_INTR_PU0_MASK;

        me |= st & TH_INTR_MD0_MASK;
        me |= st & TH_INTR_MU0_MASK;

        ex |= cp | gp | pl | me;
        if (ex) {
                writel(ex, ts->regs + THERMCTL_INTR_STATUS);
                st &= ~ex;

                if (cp) {
                        tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_CPU];
                        thermal_zone_device_update(tz,
                                                   THERMAL_EVENT_UNSPECIFIED);
                }

                if (gp) {
                        tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_GPU];
                        thermal_zone_device_update(tz,
                                                   THERMAL_EVENT_UNSPECIFIED);
                }

                if (pl) {
                        tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_PLLX];
                        thermal_zone_device_update(tz,
                                                   THERMAL_EVENT_UNSPECIFIED);
                }

                if (me) {
                        tz = ts->thermctl_tzs[TEGRA124_SOCTHERM_SENSOR_MEM];
                        thermal_zone_device_update(tz,
                                                   THERMAL_EVENT_UNSPECIFIED);
                }
        }

        /* deliberately ignore expected interrupts NOT handled in SW */
        ex |= TH_INTR_IGNORE_MASK;
        st &= ~ex;

        if (st) {
                /* Whine about any other unexpected INTR bits still set */
                pr_err("soctherm: Ignored unexpected INTRs 0x%08x\n", st);
                writel(st, ts->regs + THERMCTL_INTR_STATUS);
        }

        return IRQ_HANDLED;
}

/**
 * soctherm_oc_intr_enable() - Enables the soctherm over-current interrupt
 * @ts:         pointer to a struct tegra_soctherm
 * @alarm:              The soctherm throttle id
 * @enable:             Flag indicating enable the soctherm over-current
 *                      interrupt or disable it
 *
 * Enables a specific over-current pins @alarm to raise an interrupt if the flag
 * is set and the alarm corresponds to OC1, OC2, OC3, or OC4.
 */
static void soctherm_oc_intr_enable(struct tegra_soctherm *ts,
                                    enum soctherm_throttle_id alarm,
                                    bool enable)
{
        u32 r;

        if (!enable)
                return;

        r = readl(ts->regs + OC_INTR_ENABLE);
        switch (alarm) {
        case THROTTLE_OC1:
                r = REG_SET_MASK(r, OC_INTR_OC1_MASK, 1);
                break;
        case THROTTLE_OC2:
                r = REG_SET_MASK(r, OC_INTR_OC2_MASK, 1);
                break;
        case THROTTLE_OC3:
                r = REG_SET_MASK(r, OC_INTR_OC3_MASK, 1);
                break;
        case THROTTLE_OC4:
                r = REG_SET_MASK(r, OC_INTR_OC4_MASK, 1);
                break;
        default:
                r = 0;
                break;
        }
        writel(r, ts->regs + OC_INTR_ENABLE);
}

/**
 * soctherm_handle_alarm() - Handles soctherm alarms
 * @alarm:              The soctherm throttle id
 *
 * "Handles" over-current alarms (OC1, OC2, OC3, and OC4) by printing
 * a warning or informative message.
 *
 * Return: -EINVAL for @alarm = THROTTLE_OC3, otherwise 0 (success).
 */
static int soctherm_handle_alarm(enum soctherm_throttle_id alarm)
{
        int rv = -EINVAL;

        switch (alarm) {
        case THROTTLE_OC1:
                pr_debug("soctherm: Successfully handled OC1 alarm\n");
                rv = 0;
                break;

        case THROTTLE_OC2:
                pr_debug("soctherm: Successfully handled OC2 alarm\n");
                rv = 0;
                break;

        case THROTTLE_OC3:
                pr_debug("soctherm: Successfully handled OC3 alarm\n");
                rv = 0;
                break;

        case THROTTLE_OC4:
                pr_debug("soctherm: Successfully handled OC4 alarm\n");
                rv = 0;
                break;

        default:
                break;
        }

        if (rv)
                pr_err("soctherm: ERROR in handling %s alarm\n",
                       throt_names[alarm]);

        return rv;
}

/**
 * soctherm_edp_isr_thread() - log an over-current interrupt request
 * @irq:        OC irq number. Currently not being used. See description
 * @arg:        a void pointer for callback, currently not being used
 *
 * Over-current events are handled in hardware. This function is called to log
 * and handle any OC events that happened. Additionally, it checks every
 * over-current interrupt registers for registers are set but
 * was not expected (i.e. any discrepancy in interrupt status) by the function,
 * the discrepancy will logged.
 *
 * Return: %IRQ_HANDLED
 */
static irqreturn_t soctherm_edp_isr_thread(int irq, void *arg)
{
        struct tegra_soctherm *ts = arg;
        u32 st, ex, oc1, oc2, oc3, oc4;

        st = readl(ts->regs + OC_INTR_STATUS);

        /* deliberately clear expected interrupts handled in SW */
        oc1 = st & OC_INTR_OC1_MASK;
        oc2 = st & OC_INTR_OC2_MASK;
        oc3 = st & OC_INTR_OC3_MASK;
        oc4 = st & OC_INTR_OC4_MASK;
        ex = oc1 | oc2 | oc3 | oc4;

        pr_err("soctherm: OC ALARM 0x%08x\n", ex);
        if (ex) {
                writel(st, ts->regs + OC_INTR_STATUS);
                st &= ~ex;

                if (oc1 && !soctherm_handle_alarm(THROTTLE_OC1))
                        soctherm_oc_intr_enable(ts, THROTTLE_OC1, true);

                if (oc2 && !soctherm_handle_alarm(THROTTLE_OC2))
                        soctherm_oc_intr_enable(ts, THROTTLE_OC2, true);

                if (oc3 && !soctherm_handle_alarm(THROTTLE_OC3))
                        soctherm_oc_intr_enable(ts, THROTTLE_OC3, true);

                if (oc4 && !soctherm_handle_alarm(THROTTLE_OC4))
                        soctherm_oc_intr_enable(ts, THROTTLE_OC4, true);

                if (oc1 && soc_irq_cdata.irq_enable & BIT(0))
                        handle_nested_irq(
                                irq_find_mapping(soc_irq_cdata.domain, 0));

                if (oc2 && soc_irq_cdata.irq_enable & BIT(1))
                        handle_nested_irq(
                                irq_find_mapping(soc_irq_cdata.domain, 1));

                if (oc3 && soc_irq_cdata.irq_enable & BIT(2))
                        handle_nested_irq(
                                irq_find_mapping(soc_irq_cdata.domain, 2));

                if (oc4 && soc_irq_cdata.irq_enable & BIT(3))
                        handle_nested_irq(
                                irq_find_mapping(soc_irq_cdata.domain, 3));
        }

        if (st) {
                pr_err("soctherm: Ignored unexpected OC ALARM 0x%08x\n", st);
                writel(st, ts->regs + OC_INTR_STATUS);
        }

        return IRQ_HANDLED;
}

/**
 * soctherm_edp_isr() - Disables any active interrupts
 * @irq:        The interrupt request number
 * @arg:        Opaque pointer to an argument
 *
 * Writes to the OC_INTR_DISABLE register the over current interrupt status,
 * masking any asserted interrupts. Doing this prevents the same interrupts
 * from triggering this isr repeatedly. The thread woken by this isr will
 * handle asserted interrupts and subsequently unmask/re-enable them.
 *
 * The OC_INTR_DISABLE register indicates which OC interrupts
 * have been disabled.
 *
 * Return: %IRQ_WAKE_THREAD, handler requests to wake the handler thread
 */
static irqreturn_t soctherm_edp_isr(int irq, void *arg)
{
        struct tegra_soctherm *ts = arg;
        u32 r;

        if (!ts)
                return IRQ_NONE;

        r = readl(ts->regs + OC_INTR_STATUS);
        writel(r, ts->regs + OC_INTR_DISABLE);

        return IRQ_WAKE_THREAD;
}

/**
 * soctherm_oc_irq_lock() - locks the over-current interrupt request
 * @data:       Interrupt request data
 *
 * Looks up the chip data from @data and locks the mutex associated with
 * a particular over-current interrupt request.
 */
static void soctherm_oc_irq_lock(struct irq_data *data)
{
        struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);

        mutex_lock(&d->irq_lock);
}

/**
 * soctherm_oc_irq_sync_unlock() - Unlocks the OC interrupt request
 * @data:               Interrupt request data
 *
 * Looks up the interrupt request data @data and unlocks the mutex associated
 * with a particular over-current interrupt request.
 */
static void soctherm_oc_irq_sync_unlock(struct irq_data *data)
{
        struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);

        mutex_unlock(&d->irq_lock);
}

/**
 * soctherm_oc_irq_enable() - Enables the SOC_THERM over-current interrupt queue
 * @data:       irq_data structure of the chip
 *
 * Sets the irq_enable bit of SOC_THERM allowing SOC_THERM
 * to respond to over-current interrupts.
 *
 */
static void soctherm_oc_irq_enable(struct irq_data *data)
{
        struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);

        d->irq_enable |= BIT(data->hwirq);
}

/**
 * soctherm_oc_irq_disable() - Disables overcurrent interrupt requests
 * @data:       The interrupt request information
 *
 * Clears the interrupt request enable bit of the overcurrent
 * interrupt request chip data.
 *
 * Return: Nothing is returned (void)
 */
static void soctherm_oc_irq_disable(struct irq_data *data)
{
        struct soctherm_oc_irq_chip_data *d = irq_data_get_irq_chip_data(data);

        d->irq_enable &= ~BIT(data->hwirq);
}

static int soctherm_oc_irq_set_type(struct irq_data *data, unsigned int type)
{
        return 0;
}

/**
 * soctherm_oc_irq_map() - SOC_THERM interrupt request domain mapper
 * @h:          Interrupt request domain
 * @virq:       Virtual interrupt request number
 * @hw:         Hardware interrupt request number
 *
 * Mapping callback function for SOC_THERM's irq_domain. When a SOC_THERM
 * interrupt request is called, the irq_domain takes the request's virtual
 * request number (much like a virtual memory address) and maps it to a
 * physical hardware request number.
 *
 * When a mapping doesn't already exist for a virtual request number, the
 * irq_domain calls this function to associate the virtual request number with
 * a hardware request number.
 *
 * Return: 0
 */
static int soctherm_oc_irq_map(struct irq_domain *h, unsigned int virq,
                irq_hw_number_t hw)
{
        struct soctherm_oc_irq_chip_data *data = h->host_data;

        irq_set_chip_data(virq, data);
        irq_set_chip(virq, &data->irq_chip);
        irq_set_nested_thread(virq, 1);
        return 0;
}

/**
 * soctherm_irq_domain_xlate_twocell() - xlate for soctherm interrupts
 * @d:      Interrupt request domain
 * @ctrlr:      Controller device tree node
 * @intspec:    Array of u32s from DTs "interrupt" property
 * @intsize:    Number of values inside the intspec array
 * @out_hwirq:  HW IRQ value associated with this interrupt
 * @out_type:   The IRQ SENSE type for this interrupt.
 *
 * This Device Tree IRQ specifier translation function will translate a
 * specific "interrupt" as defined by 2 DT values where the cell values map
 * the hwirq number + 1 and linux irq flags. Since the output is the hwirq
 * number, this function will subtract 1 from the value listed in DT.
 *
 * Return: 0
 */
static int soctherm_irq_domain_xlate_twocell(struct irq_domain *d,
        struct device_node *ctrlr, const u32 *intspec, unsigned int intsize,
        irq_hw_number_t *out_hwirq, unsigned int *out_type)
{
        if (WARN_ON(intsize < 2))
                return -EINVAL;

        /*
         * The HW value is 1 index less than the DT IRQ values.
         * i.e. OC4 goes to HW index 3.
         */
        *out_hwirq = intspec[0] - 1;
        *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
        return 0;
}

static const struct irq_domain_ops soctherm_oc_domain_ops = {
        .map    = soctherm_oc_irq_map,
        .xlate  = soctherm_irq_domain_xlate_twocell,
};

/**
 * soctherm_oc_int_init() - Initial enabling of the over
 * current interrupts
 * @np: The devicetree node for soctherm
 * @num_irqs:   The number of new interrupt requests
 *
 * Sets the over current interrupt request chip data
 *
 * Return: 0 on success or if overcurrent interrupts are not enabled,
 * -ENOMEM (out of memory), or irq_base if the function failed to
 * allocate the irqs
 */
static int soctherm_oc_int_init(struct device_node *np, int num_irqs)
{
        if (!num_irqs) {
                pr_info("%s(): OC interrupts are not enabled\n", __func__);
                return 0;
        }

        mutex_init(&soc_irq_cdata.irq_lock);
        soc_irq_cdata.irq_enable = 0;

        soc_irq_cdata.irq_chip.name = "soc_therm_oc";
        soc_irq_cdata.irq_chip.irq_bus_lock = soctherm_oc_irq_lock;
        soc_irq_cdata.irq_chip.irq_bus_sync_unlock =
                soctherm_oc_irq_sync_unlock;
        soc_irq_cdata.irq_chip.irq_disable = soctherm_oc_irq_disable;
        soc_irq_cdata.irq_chip.irq_enable = soctherm_oc_irq_enable;
        soc_irq_cdata.irq_chip.irq_set_type = soctherm_oc_irq_set_type;
        soc_irq_cdata.irq_chip.irq_set_wake = NULL;

        soc_irq_cdata.domain = irq_domain_add_linear(np, num_irqs,
                                                     &soctherm_oc_domain_ops,
                                                     &soc_irq_cdata);

        if (!soc_irq_cdata.domain) {
                pr_err("%s: Failed to create IRQ domain\n", __func__);
                return -ENOMEM;
        }

        pr_debug("%s(): OC interrupts enabled successful\n", __func__);
        return 0;
}

#ifdef CONFIG_DEBUG_FS
static int regs_show(struct seq_file *s, void *data)
{
        struct platform_device *pdev = s->private;
        struct tegra_soctherm *ts = platform_get_drvdata(pdev);
        const struct tegra_tsensor *tsensors = ts->soc->tsensors;
        const struct tegra_tsensor_group **ttgs = ts->soc->ttgs;
        u32 r, state;
        int i, level;

        seq_puts(s, "-----TSENSE (convert HW)-----\n");

        for (i = 0; i < ts->soc->num_tsensors; i++) {
                r = readl(ts->regs + tsensors[i].base + SENSOR_CONFIG1);
                state = REG_GET_MASK(r, SENSOR_CONFIG1_TEMP_ENABLE);

                seq_printf(s, "%s: ", tsensors[i].name);
                seq_printf(s, "En(%d) ", state);

                if (!state) {
                        seq_puts(s, "\n");
                        continue;
                }

                state = REG_GET_MASK(r, SENSOR_CONFIG1_TIDDQ_EN_MASK);
                seq_printf(s, "tiddq(%d) ", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG1_TEN_COUNT_MASK);
                seq_printf(s, "ten_count(%d) ", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG1_TSAMPLE_MASK);
                seq_printf(s, "tsample(%d) ", state + 1);

                r = readl(ts->regs + tsensors[i].base + SENSOR_STATUS1);
                state = REG_GET_MASK(r, SENSOR_STATUS1_TEMP_VALID_MASK);
                seq_printf(s, "Temp(%d/", state);
                state = REG_GET_MASK(r, SENSOR_STATUS1_TEMP_MASK);
                seq_printf(s, "%d) ", translate_temp(state));

                r = readl(ts->regs + tsensors[i].base + SENSOR_STATUS0);
                state = REG_GET_MASK(r, SENSOR_STATUS0_VALID_MASK);
                seq_printf(s, "Capture(%d/", state);
                state = REG_GET_MASK(r, SENSOR_STATUS0_CAPTURE_MASK);
                seq_printf(s, "%d) ", state);

                r = readl(ts->regs + tsensors[i].base + SENSOR_CONFIG0);
                state = REG_GET_MASK(r, SENSOR_CONFIG0_STOP);
                seq_printf(s, "Stop(%d) ", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG0_TALL_MASK);
                seq_printf(s, "Tall(%d) ", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG0_TCALC_OVER);
                seq_printf(s, "Over(%d/", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG0_OVER);
                seq_printf(s, "%d/", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG0_CPTR_OVER);
                seq_printf(s, "%d) ", state);

                r = readl(ts->regs + tsensors[i].base + SENSOR_CONFIG2);
                state = REG_GET_MASK(r, SENSOR_CONFIG2_THERMA_MASK);
                seq_printf(s, "Therm_A/B(%d/", state);
                state = REG_GET_MASK(r, SENSOR_CONFIG2_THERMB_MASK);
                seq_printf(s, "%d)\n", (s16)state);
        }

        r = readl(ts->regs + SENSOR_PDIV);
        seq_printf(s, "PDIV: 0x%x\n", r);

        r = readl(ts->regs + SENSOR_HOTSPOT_OFF);
        seq_printf(s, "HOTSPOT: 0x%x\n", r);

        seq_puts(s, "\n");
        seq_puts(s, "-----SOC_THERM-----\n");

        r = readl(ts->regs + SENSOR_TEMP1);
        state = REG_GET_MASK(r, SENSOR_TEMP1_CPU_TEMP_MASK);
        seq_printf(s, "Temperatures: CPU(%d) ", translate_temp(state));
        state = REG_GET_MASK(r, SENSOR_TEMP1_GPU_TEMP_MASK);
        seq_printf(s, " GPU(%d) ", translate_temp(state));
        r = readl(ts->regs + SENSOR_TEMP2);
        state = REG_GET_MASK(r, SENSOR_TEMP2_PLLX_TEMP_MASK);
        seq_printf(s, " PLLX(%d) ", translate_temp(state));
        state = REG_GET_MASK(r, SENSOR_TEMP2_MEM_TEMP_MASK);
        seq_printf(s, " MEM(%d)\n", translate_temp(state));

        for (i = 0; i < ts->soc->num_ttgs; i++) {
                seq_printf(s, "%s:\n", ttgs[i]->name);
                for (level = 0; level < 4; level++) {
                        s32 v;
                        u32 mask;
                        u16 off = ttgs[i]->thermctl_lvl0_offset;

                        r = readl(ts->regs + THERMCTL_LVL_REG(off, level));

                        mask = ttgs[i]->thermctl_lvl0_up_thresh_mask;
                        state = REG_GET_MASK(r, mask);
                        v = sign_extend32(state, ts->soc->bptt - 1);
                        v *= ts->soc->thresh_grain;
                        seq_printf(s, "   %d: Up/Dn(%d /", level, v);

                        mask = ttgs[i]->thermctl_lvl0_dn_thresh_mask;
                        state = REG_GET_MASK(r, mask);
                        v = sign_extend32(state, ts->soc->bptt - 1);
                        v *= ts->soc->thresh_grain;
                        seq_printf(s, "%d ) ", v);

                        mask = THERMCTL_LVL0_CPU0_EN_MASK;
                        state = REG_GET_MASK(r, mask);
                        seq_printf(s, "En(%d) ", state);

                        mask = THERMCTL_LVL0_CPU0_CPU_THROT_MASK;
                        state = REG_GET_MASK(r, mask);
                        seq_puts(s, "CPU Throt");
                        if (!state)
                                seq_printf(s, "(%s) ", "none");
                        else if (state == THERMCTL_LVL0_CPU0_CPU_THROT_LIGHT)
                                seq_printf(s, "(%s) ", "L");
                        else if (state == THERMCTL_LVL0_CPU0_CPU_THROT_HEAVY)
                                seq_printf(s, "(%s) ", "H");
                        else
                                seq_printf(s, "(%s) ", "H+L");

                        mask = THERMCTL_LVL0_CPU0_GPU_THROT_MASK;
                        state = REG_GET_MASK(r, mask);
                        seq_puts(s, "GPU Throt");
                        if (!state)
                                seq_printf(s, "(%s) ", "none");
                        else if (state == THERMCTL_LVL0_CPU0_GPU_THROT_LIGHT)
                                seq_printf(s, "(%s) ", "L");
                        else if (state == THERMCTL_LVL0_CPU0_GPU_THROT_HEAVY)
                                seq_printf(s, "(%s) ", "H");
                        else
                                seq_printf(s, "(%s) ", "H+L");

                        mask = THERMCTL_LVL0_CPU0_STATUS_MASK;
                        state = REG_GET_MASK(r, mask);
                        seq_printf(s, "Status(%s)\n",
                                   state == 0 ? "LO" :
                                   state == 1 ? "In" :
                                   state == 2 ? "Res" : "HI");
                }
        }

        r = readl(ts->regs + THERMCTL_STATS_CTL);
        seq_printf(s, "STATS: Up(%s) Dn(%s)\n",
                   r & STATS_CTL_EN_UP ? "En" : "--",
                   r & STATS_CTL_EN_DN ? "En" : "--");

        for (level = 0; level < 4; level++) {
                u16 off;

                off = THERMCTL_LVL0_UP_STATS;
                r = readl(ts->regs + THERMCTL_LVL_REG(off, level));
                seq_printf(s, "  Level_%d Up(%d) ", level, r);

                off = THERMCTL_LVL0_DN_STATS;
                r = readl(ts->regs + THERMCTL_LVL_REG(off, level));
                seq_printf(s, "Dn(%d)\n", r);
        }

        r = readl(ts->regs + THERMCTL_THERMTRIP_CTL);
        state = REG_GET_MASK(r, ttgs[0]->thermtrip_any_en_mask);
        seq_printf(s, "Thermtrip Any En(%d)\n", state);
        for (i = 0; i < ts->soc->num_ttgs; i++) {
                state = REG_GET_MASK(r, ttgs[i]->thermtrip_enable_mask);
                seq_printf(s, "     %s En(%d) ", ttgs[i]->name, state);
                state = REG_GET_MASK(r, ttgs[i]->thermtrip_threshold_mask);
                state *= ts->soc->thresh_grain;
                seq_printf(s, "Thresh(%d)\n", state);
        }

        r = readl(ts->regs + THROT_GLOBAL_CFG);
        seq_puts(s, "\n");
        seq_printf(s, "GLOBAL THROTTLE CONFIG: 0x%08x\n", r);

        seq_puts(s, "---------------------------------------------------\n");
        r = readl(ts->regs + THROT_STATUS);
        state = REG_GET_MASK(r, THROT_STATUS_BREACH_MASK);
        seq_printf(s, "THROT STATUS: breach(%d) ", state);
        state = REG_GET_MASK(r, THROT_STATUS_STATE_MASK);
        seq_printf(s, "state(%d) ", state);
        state = REG_GET_MASK(r, THROT_STATUS_ENABLED_MASK);
        seq_printf(s, "enabled(%d)\n", state);

        r = readl(ts->regs + CPU_PSKIP_STATUS);
        if (ts->soc->use_ccroc) {
                state = REG_GET_MASK(r, XPU_PSKIP_STATUS_ENABLED_MASK);
                seq_printf(s, "CPU PSKIP STATUS: enabled(%d)\n", state);
        } else {
                state = REG_GET_MASK(r, XPU_PSKIP_STATUS_M_MASK);
                seq_printf(s, "CPU PSKIP STATUS: M(%d) ", state);
                state = REG_GET_MASK(r, XPU_PSKIP_STATUS_N_MASK);
                seq_printf(s, "N(%d) ", state);
                state = REG_GET_MASK(r, XPU_PSKIP_STATUS_ENABLED_MASK);
                seq_printf(s, "enabled(%d)\n", state);
        }

        return 0;
}

DEFINE_SHOW_ATTRIBUTE(regs);

static void soctherm_debug_init(struct platform_device *pdev)
{
        struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
        struct dentry *root;

        root = debugfs_create_dir("soctherm", NULL);

        tegra->debugfs_dir = root;

        debugfs_create_file("reg_contents", 0644, root, pdev, &regs_fops);
}
#else
static inline void soctherm_debug_init(struct platform_device *pdev) {}
#endif

static int soctherm_clk_enable(struct platform_device *pdev, bool enable)
{
        struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
        int err;

        if (!tegra->clock_soctherm || !tegra->clock_tsensor)
                return -EINVAL;

        reset_control_assert(tegra->reset);

        if (enable) {
                err = clk_prepare_enable(tegra->clock_soctherm);
                if (err) {
                        reset_control_deassert(tegra->reset);
                        return err;
                }

                err = clk_prepare_enable(tegra->clock_tsensor);
                if (err) {
                        clk_disable_unprepare(tegra->clock_soctherm);
                        reset_control_deassert(tegra->reset);
                        return err;
                }
        } else {
                clk_disable_unprepare(tegra->clock_tsensor);
                clk_disable_unprepare(tegra->clock_soctherm);
        }

        reset_control_deassert(tegra->reset);

        return 0;
}

static int throt_get_cdev_max_state(struct thermal_cooling_device *cdev,
                                    unsigned long *max_state)
{
        *max_state = 1;
        return 0;
}

static int throt_get_cdev_cur_state(struct thermal_cooling_device *cdev,
                                    unsigned long *cur_state)
{
        struct tegra_soctherm *ts = cdev->devdata;
        u32 r;

        r = readl(ts->regs + THROT_STATUS);
        if (REG_GET_MASK(r, THROT_STATUS_STATE_MASK))
                *cur_state = 1;
        else
                *cur_state = 0;

        return 0;
}

static int throt_set_cdev_state(struct thermal_cooling_device *cdev,
                                unsigned long cur_state)
{
        return 0;
}

static const struct thermal_cooling_device_ops throt_cooling_ops = {
        .get_max_state = throt_get_cdev_max_state,
        .get_cur_state = throt_get_cdev_cur_state,
        .set_cur_state = throt_set_cdev_state,
};

static int soctherm_thermtrips_parse(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        struct tsensor_group_thermtrips *tt = ts->soc->thermtrips;
        const int max_num_prop = ts->soc->num_ttgs * 2;
        u32 *tlb;
        int i, j, n, ret;

        if (!tt)
                return -ENOMEM;

        n = of_property_count_u32_elems(dev->of_node, "nvidia,thermtrips");
        if (n <= 0) {
                dev_info(dev,
                         "missing thermtrips, will use critical trips as shut down temp\n");
                return n;
        }

        n = min(max_num_prop, n);

        tlb = devm_kcalloc(&pdev->dev, max_num_prop, sizeof(u32), GFP_KERNEL);
        if (!tlb)
                return -ENOMEM;
        ret = of_property_read_u32_array(dev->of_node, "nvidia,thermtrips",
                                         tlb, n);
        if (ret) {
                dev_err(dev, "invalid num ele: thermtrips:%d\n", ret);
                return ret;
        }

        i = 0;
        for (j = 0; j < n; j = j + 2) {
                if (tlb[j] >= TEGRA124_SOCTHERM_SENSOR_NUM)
                        continue;

                tt[i].id = tlb[j];
                tt[i].temp = tlb[j + 1];
                i++;
        }

        return 0;
}

static void soctherm_oc_cfg_parse(struct device *dev,
                                struct device_node *np_oc,
                                struct soctherm_throt_cfg *stc)
{
        u32 val;

        if (of_property_read_bool(np_oc, "nvidia,polarity-active-low"))
                stc->oc_cfg.active_low = 1;
        else
                stc->oc_cfg.active_low = 0;

        if (!of_property_read_u32(np_oc, "nvidia,count-threshold", &val)) {
                stc->oc_cfg.intr_en = 1;
                stc->oc_cfg.alarm_cnt_thresh = val;
        }

        if (!of_property_read_u32(np_oc, "nvidia,throttle-period-us", &val))
                stc->oc_cfg.throt_period = val;

        if (!of_property_read_u32(np_oc, "nvidia,alarm-filter", &val))
                stc->oc_cfg.alarm_filter = val;

        /* BRIEF throttling by default, do not support STICKY */
        stc->oc_cfg.mode = OC_THROTTLE_MODE_BRIEF;
}

static int soctherm_throt_cfg_parse(struct device *dev,
                                    struct device_node *np,
                                    struct soctherm_throt_cfg *stc)
{
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        int ret;
        u32 val;

        ret = of_property_read_u32(np, "nvidia,priority", &val);
        if (ret) {
                dev_err(dev, "throttle-cfg: %s: invalid priority\n", stc->name);
                return -EINVAL;
        }
        stc->priority = val;

        ret = of_property_read_u32(np, ts->soc->use_ccroc ?
                                   "nvidia,cpu-throt-level" :
                                   "nvidia,cpu-throt-percent", &val);
        if (!ret) {
                if (ts->soc->use_ccroc &&
                    val <= TEGRA_SOCTHERM_THROT_LEVEL_HIGH)
                        stc->cpu_throt_level = val;
                else if (!ts->soc->use_ccroc && val <= 100)
                        stc->cpu_throt_depth = val;
                else
                        goto err;
        } else {
                goto err;
        }

        ret = of_property_read_u32(np, "nvidia,gpu-throt-level", &val);
        if (!ret && val <= TEGRA_SOCTHERM_THROT_LEVEL_HIGH)
                stc->gpu_throt_level = val;
        else
                goto err;

        return 0;

err:
        dev_err(dev, "throttle-cfg: %s: no throt prop or invalid prop\n",
                stc->name);
        return -EINVAL;
}

/**
 * soctherm_init_hw_throt_cdev() - Parse the HW throttle configurations
 * and register them as cooling devices.
 * @pdev: Pointer to platform_device struct
 */
static void soctherm_init_hw_throt_cdev(struct platform_device *pdev)
{
        struct device *dev = &pdev->dev;
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        struct device_node *np_stc, *np_stcc;
        const char *name;
        int i;

        for (i = 0; i < THROTTLE_SIZE; i++) {
                ts->throt_cfgs[i].name = throt_names[i];
                ts->throt_cfgs[i].id = i;
                ts->throt_cfgs[i].init = false;
        }

        np_stc = of_get_child_by_name(dev->of_node, "throttle-cfgs");
        if (!np_stc) {
                dev_info(dev,
                         "throttle-cfg: no throttle-cfgs - not enabling\n");
                return;
        }

        for_each_child_of_node(np_stc, np_stcc) {
                struct soctherm_throt_cfg *stc;
                struct thermal_cooling_device *tcd;
                int err;

                name = np_stcc->name;
                stc = find_throttle_cfg_by_name(ts, name);
                if (!stc) {
                        dev_err(dev,
                                "throttle-cfg: could not find %s\n", name);
                        continue;
                }

                if (stc->init) {
                        dev_err(dev, "throttle-cfg: %s: redefined!\n", name);
                        of_node_put(np_stcc);
                        break;
                }

                err = soctherm_throt_cfg_parse(dev, np_stcc, stc);
                if (err)
                        continue;

                if (stc->id >= THROTTLE_OC1) {
                        soctherm_oc_cfg_parse(dev, np_stcc, stc);
                        stc->init = true;
                } else {

                        tcd = thermal_of_cooling_device_register(np_stcc,
                                                         (char *)name, ts,
                                                         &throt_cooling_ops);
                        if (IS_ERR_OR_NULL(tcd)) {
                                dev_err(dev,
                                        "throttle-cfg: %s: failed to register cooling device\n",
                                        name);
                                continue;
                        }
                        stc->cdev = tcd;
                        stc->init = true;
                }

        }

        of_node_put(np_stc);
}

/**
 * throttlectl_cpu_level_cfg() - programs CCROC NV_THERM level config
 * @ts: pointer to a struct tegra_soctherm
 * @level: describing the level LOW/MED/HIGH of throttling
 *
 * It's necessary to set up the CPU-local CCROC NV_THERM instance with
 * the M/N values desired for each level. This function does this.
 *
 * This function pre-programs the CCROC NV_THERM levels in terms of
 * pre-configured "Low", "Medium" or "Heavy" throttle levels which are
 * mapped to THROT_LEVEL_LOW, THROT_LEVEL_MED and THROT_LEVEL_HVY.
 */
static void throttlectl_cpu_level_cfg(struct tegra_soctherm *ts, int level)
{
        u8 depth, dividend;
        u32 r;

        switch (level) {
        case TEGRA_SOCTHERM_THROT_LEVEL_LOW:
                depth = 50;
                break;
        case TEGRA_SOCTHERM_THROT_LEVEL_MED:
                depth = 75;
                break;
        case TEGRA_SOCTHERM_THROT_LEVEL_HIGH:
                depth = 80;
                break;
        case TEGRA_SOCTHERM_THROT_LEVEL_NONE:
                return;
        default:
                return;
        }

        dividend = THROT_DEPTH_DIVIDEND(depth);

        /* setup PSKIP in ccroc nv_therm registers */
        r = ccroc_readl(ts, CCROC_THROT_PSKIP_RAMP_CPU_REG(level));
        r = REG_SET_MASK(r, CCROC_THROT_PSKIP_RAMP_DURATION_MASK, 0xff);
        r = REG_SET_MASK(r, CCROC_THROT_PSKIP_RAMP_STEP_MASK, 0xf);
        ccroc_writel(ts, r, CCROC_THROT_PSKIP_RAMP_CPU_REG(level));

        r = ccroc_readl(ts, CCROC_THROT_PSKIP_CTRL_CPU_REG(level));
        r = REG_SET_MASK(r, CCROC_THROT_PSKIP_CTRL_ENB_MASK, 1);
        r = REG_SET_MASK(r, CCROC_THROT_PSKIP_CTRL_DIVIDEND_MASK, dividend);
        r = REG_SET_MASK(r, CCROC_THROT_PSKIP_CTRL_DIVISOR_MASK, 0xff);
        ccroc_writel(ts, r, CCROC_THROT_PSKIP_CTRL_CPU_REG(level));
}

/**
 * throttlectl_cpu_level_select() - program CPU pulse skipper config
 * @ts: pointer to a struct tegra_soctherm
 * @throt: the LIGHT/HEAVY of throttle event id
 *
 * Pulse skippers are used to throttle clock frequencies.  This
 * function programs the pulse skippers based on @throt and platform
 * data.  This function is used on SoCs which have CPU-local pulse
 * skipper control, such as T13x. It programs soctherm's interface to
 * Denver:CCROC NV_THERM in terms of Low, Medium and HIGH throttling
 * vectors. PSKIP_BYPASS mode is set as required per HW spec.
 */
static void throttlectl_cpu_level_select(struct tegra_soctherm *ts,
                                         enum soctherm_throttle_id throt)
{
        u32 r, throt_vect;

        /* Denver:CCROC NV_THERM interface N:3 Mapping */
        switch (ts->throt_cfgs[throt].cpu_throt_level) {
        case TEGRA_SOCTHERM_THROT_LEVEL_LOW:
                throt_vect = THROT_VECT_LOW;
                break;
        case TEGRA_SOCTHERM_THROT_LEVEL_MED:
                throt_vect = THROT_VECT_MED;
                break;
        case TEGRA_SOCTHERM_THROT_LEVEL_HIGH:
                throt_vect = THROT_VECT_HIGH;
                break;
        default:
                throt_vect = THROT_VECT_NONE;
                break;
        }

        r = readl(ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_CPU));
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_ENABLE_MASK, 1);
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_VECT_CPU_MASK, throt_vect);
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_VECT2_CPU_MASK, throt_vect);
        writel(r, ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_CPU));

        /* bypass sequencer in soc_therm as it is programmed in ccroc */
        r = REG_SET_MASK(0, THROT_PSKIP_RAMP_SEQ_BYPASS_MODE_MASK, 1);
        writel(r, ts->regs + THROT_PSKIP_RAMP(throt, THROTTLE_DEV_CPU));
}

/**
 * throttlectl_cpu_mn() - program CPU pulse skipper configuration
 * @ts: pointer to a struct tegra_soctherm
 * @throt: the LIGHT/HEAVY of throttle event id
 *
 * Pulse skippers are used to throttle clock frequencies.  This
 * function programs the pulse skippers based on @throt and platform
 * data.  This function is used for CPUs that have "remote" pulse
 * skipper control, e.g., the CPU pulse skipper is controlled by the
 * SOC_THERM IP block.  (SOC_THERM is located outside the CPU
 * complex.)
 */
static void throttlectl_cpu_mn(struct tegra_soctherm *ts,
                               enum soctherm_throttle_id throt)
{
        u32 r;
        int depth;
        u8 dividend;

        depth = ts->throt_cfgs[throt].cpu_throt_depth;
        dividend = THROT_DEPTH_DIVIDEND(depth);

        r = readl(ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_CPU));
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_ENABLE_MASK, 1);
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_DIVIDEND_MASK, dividend);
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_DIVISOR_MASK, 0xff);
        writel(r, ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_CPU));

        r = readl(ts->regs + THROT_PSKIP_RAMP(throt, THROTTLE_DEV_CPU));
        r = REG_SET_MASK(r, THROT_PSKIP_RAMP_DURATION_MASK, 0xff);
        r = REG_SET_MASK(r, THROT_PSKIP_RAMP_STEP_MASK, 0xf);
        writel(r, ts->regs + THROT_PSKIP_RAMP(throt, THROTTLE_DEV_CPU));
}

/**
 * throttlectl_gpu_level_select() - selects throttling level for GPU
 * @ts: pointer to a struct tegra_soctherm
 * @throt: the LIGHT/HEAVY of throttle event id
 *
 * This function programs soctherm's interface to GK20a NV_THERM to select
 * pre-configured "Low", "Medium" or "Heavy" throttle levels.
 *
 * Return: boolean true if HW was programmed
 */
static void throttlectl_gpu_level_select(struct tegra_soctherm *ts,
                                         enum soctherm_throttle_id throt)
{
        u32 r, level, throt_vect;

        level = ts->throt_cfgs[throt].gpu_throt_level;
        throt_vect = THROT_LEVEL_TO_DEPTH(level);
        r = readl(ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_GPU));
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_ENABLE_MASK, 1);
        r = REG_SET_MASK(r, THROT_PSKIP_CTRL_VECT_GPU_MASK, throt_vect);
        writel(r, ts->regs + THROT_PSKIP_CTRL(throt, THROTTLE_DEV_GPU));
}

static int soctherm_oc_cfg_program(struct tegra_soctherm *ts,
                                      enum soctherm_throttle_id throt)
{
        u32 r;
        struct soctherm_oc_cfg *oc = &ts->throt_cfgs[throt].oc_cfg;

        if (oc->mode == OC_THROTTLE_MODE_DISABLED)
                return -EINVAL;

        r = REG_SET_MASK(0, OC1_CFG_HW_RESTORE_MASK, 1);
        r = REG_SET_MASK(r, OC1_CFG_THROTTLE_MODE_MASK, oc->mode);
        r = REG_SET_MASK(r, OC1_CFG_ALARM_POLARITY_MASK, oc->active_low);
        r = REG_SET_MASK(r, OC1_CFG_EN_THROTTLE_MASK, 1);
        writel(r, ts->regs + ALARM_CFG(throt));
        writel(oc->throt_period, ts->regs + ALARM_THROTTLE_PERIOD(throt));
        writel(oc->alarm_cnt_thresh, ts->regs + ALARM_CNT_THRESHOLD(throt));
        writel(oc->alarm_filter, ts->regs + ALARM_FILTER(throt));
        soctherm_oc_intr_enable(ts, throt, oc->intr_en);

        return 0;
}

/**
 * soctherm_throttle_program() - programs pulse skippers' configuration
 * @ts: pointer to a struct tegra_soctherm
 * @throt: the LIGHT/HEAVY of the throttle event id.
 *
 * Pulse skippers are used to throttle clock frequencies.
 * This function programs the pulse skippers.
 */
static void soctherm_throttle_program(struct tegra_soctherm *ts,
                                      enum soctherm_throttle_id throt)
{
        u32 r;
        struct soctherm_throt_cfg stc = ts->throt_cfgs[throt];

        if (!stc.init)
                return;

        if ((throt >= THROTTLE_OC1) && (soctherm_oc_cfg_program(ts, throt)))
                return;

        /* Setup PSKIP parameters */
        if (ts->soc->use_ccroc)
                throttlectl_cpu_level_select(ts, throt);
        else
                throttlectl_cpu_mn(ts, throt);

        throttlectl_gpu_level_select(ts, throt);

        r = REG_SET_MASK(0, THROT_PRIORITY_LITE_PRIO_MASK, stc.priority);
        writel(r, ts->regs + THROT_PRIORITY_CTRL(throt));

        r = REG_SET_MASK(0, THROT_DELAY_LITE_DELAY_MASK, 0);
        writel(r, ts->regs + THROT_DELAY_CTRL(throt));

        r = readl(ts->regs + THROT_PRIORITY_LOCK);
        r = REG_GET_MASK(r, THROT_PRIORITY_LOCK_PRIORITY_MASK);
        if (r >= stc.priority)
                return;
        r = REG_SET_MASK(0, THROT_PRIORITY_LOCK_PRIORITY_MASK,
                         stc.priority);
        writel(r, ts->regs + THROT_PRIORITY_LOCK);
}

static void tegra_soctherm_throttle(struct device *dev)
{
        struct tegra_soctherm *ts = dev_get_drvdata(dev);
        u32 v;
        int i;

        /* configure LOW, MED and HIGH levels for CCROC NV_THERM */
        if (ts->soc->use_ccroc) {
                throttlectl_cpu_level_cfg(ts, TEGRA_SOCTHERM_THROT_LEVEL_LOW);
                throttlectl_cpu_level_cfg(ts, TEGRA_SOCTHERM_THROT_LEVEL_MED);
                throttlectl_cpu_level_cfg(ts, TEGRA_SOCTHERM_THROT_LEVEL_HIGH);
        }

        /* Thermal HW throttle programming */
        for (i = 0; i < THROTTLE_SIZE; i++)
                soctherm_throttle_program(ts, i);

        v = REG_SET_MASK(0, THROT_GLOBAL_ENB_MASK, 1);
        if (ts->soc->use_ccroc) {
                ccroc_writel(ts, v, CCROC_GLOBAL_CFG);

                v = ccroc_readl(ts, CCROC_SUPER_CCLKG_DIVIDER);
                v = REG_SET_MASK(v, CDIVG_USE_THERM_CONTROLS_MASK, 1);
                ccroc_writel(ts, v, CCROC_SUPER_CCLKG_DIVIDER);
        } else {
                writel(v, ts->regs + THROT_GLOBAL_CFG);

                v = readl(ts->clk_regs + CAR_SUPER_CCLKG_DIVIDER);
                v = REG_SET_MASK(v, CDIVG_USE_THERM_CONTROLS_MASK, 1);
                writel(v, ts->clk_regs + CAR_SUPER_CCLKG_DIVIDER);
        }

        /* initialize stats collection */
        v = STATS_CTL_CLR_DN | STATS_CTL_EN_DN |
            STATS_CTL_CLR_UP | STATS_CTL_EN_UP;
        writel(v, ts->regs + THERMCTL_STATS_CTL);
}

static int soctherm_interrupts_init(struct platform_device *pdev,
                                    struct tegra_soctherm *tegra)
{
        struct device_node *np = pdev->dev.of_node;
        int ret;

        ret = soctherm_oc_int_init(np, TEGRA_SOC_OC_IRQ_MAX);
        if (ret < 0) {
                dev_err(&pdev->dev, "soctherm_oc_int_init failed\n");
                return ret;
        }

        tegra->thermal_irq = platform_get_irq(pdev, 0);
        if (tegra->thermal_irq < 0) {
                dev_dbg(&pdev->dev, "get 'thermal_irq' failed.\n");
                return 0;
        }

        tegra->edp_irq = platform_get_irq(pdev, 1);
        if (tegra->edp_irq < 0) {
                dev_dbg(&pdev->dev, "get 'edp_irq' failed.\n");
                return 0;
        }

        ret = devm_request_threaded_irq(&pdev->dev,
                                        tegra->thermal_irq,
                                        soctherm_thermal_isr,
                                        soctherm_thermal_isr_thread,
                                        IRQF_ONESHOT,
                                        dev_name(&pdev->dev),
                                        tegra);
        if (ret < 0) {
                dev_err(&pdev->dev, "request_irq 'thermal_irq' failed.\n");
                return ret;
        }

        ret = devm_request_threaded_irq(&pdev->dev,
                                        tegra->edp_irq,
                                        soctherm_edp_isr,
                                        soctherm_edp_isr_thread,
                                        IRQF_ONESHOT,
                                        "soctherm_edp",
                                        tegra);
        if (ret < 0) {
                dev_err(&pdev->dev, "request_irq 'edp_irq' failed.\n");
                return ret;
        }

        return 0;
}

static void soctherm_init(struct platform_device *pdev)
{
        struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
        const struct tegra_tsensor_group **ttgs = tegra->soc->ttgs;
        int i;
        u32 pdiv, hotspot;

        /* Initialize raw sensors */
        for (i = 0; i < tegra->soc->num_tsensors; ++i)
                enable_tsensor(tegra, i);

        /* program pdiv and hotspot offsets per THERM */
        pdiv = readl(tegra->regs + SENSOR_PDIV);
        hotspot = readl(tegra->regs + SENSOR_HOTSPOT_OFF);
        for (i = 0; i < tegra->soc->num_ttgs; ++i) {
                pdiv = REG_SET_MASK(pdiv, ttgs[i]->pdiv_mask,
                                    ttgs[i]->pdiv);
                /* hotspot offset from PLLX, doesn't need to configure PLLX */
                if (ttgs[i]->id == TEGRA124_SOCTHERM_SENSOR_PLLX)
                        continue;
                hotspot =  REG_SET_MASK(hotspot,
                                        ttgs[i]->pllx_hotspot_mask,
                                        ttgs[i]->pllx_hotspot_diff);
        }
        writel(pdiv, tegra->regs + SENSOR_PDIV);
        writel(hotspot, tegra->regs + SENSOR_HOTSPOT_OFF);

        /* Configure hw throttle */
        tegra_soctherm_throttle(&pdev->dev);
}

static const struct of_device_id tegra_soctherm_of_match[] = {
#ifdef CONFIG_ARCH_TEGRA_124_SOC
        {
                .compatible = "nvidia,tegra124-soctherm",
                .data = &tegra124_soctherm,
        },
#endif
#ifdef CONFIG_ARCH_TEGRA_132_SOC
        {
                .compatible = "nvidia,tegra132-soctherm",
                .data = &tegra132_soctherm,
        },
#endif
#ifdef CONFIG_ARCH_TEGRA_210_SOC
        {
                .compatible = "nvidia,tegra210-soctherm",
                .data = &tegra210_soctherm,
        },
#endif
        { },
};
MODULE_DEVICE_TABLE(of, tegra_soctherm_of_match);

static int tegra_soctherm_probe(struct platform_device *pdev)
{
        const struct of_device_id *match;
        struct tegra_soctherm *tegra;
        struct thermal_zone_device *z;
        struct tsensor_shared_calib shared_calib;
        struct resource *res;
        struct tegra_soctherm_soc *soc;
        unsigned int i;
        int err;

        match = of_match_node(tegra_soctherm_of_match, pdev->dev.of_node);
        if (!match)
                return -ENODEV;

        soc = (struct tegra_soctherm_soc *)match->data;
        if (soc->num_ttgs > TEGRA124_SOCTHERM_SENSOR_NUM)
                return -EINVAL;

        tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
        if (!tegra)
                return -ENOMEM;

        mutex_init(&tegra->thermctl_lock);
        dev_set_drvdata(&pdev->dev, tegra);

        tegra->soc = soc;

        res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                                           "soctherm-reg");
        tegra->regs = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(tegra->regs)) {
                dev_err(&pdev->dev, "can't get soctherm registers");
                return PTR_ERR(tegra->regs);
        }

        if (!tegra->soc->use_ccroc) {
                res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                                                   "car-reg");
                tegra->clk_regs = devm_ioremap_resource(&pdev->dev, res);
                if (IS_ERR(tegra->clk_regs)) {
                        dev_err(&pdev->dev, "can't get car clk registers");
                        return PTR_ERR(tegra->clk_regs);
                }
        } else {
                res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
                                                   "ccroc-reg");
                tegra->ccroc_regs = devm_ioremap_resource(&pdev->dev, res);
                if (IS_ERR(tegra->ccroc_regs)) {
                        dev_err(&pdev->dev, "can't get ccroc registers");
                        return PTR_ERR(tegra->ccroc_regs);
                }
        }

        tegra->reset = devm_reset_control_get(&pdev->dev, "soctherm");
        if (IS_ERR(tegra->reset)) {
                dev_err(&pdev->dev, "can't get soctherm reset\n");
                return PTR_ERR(tegra->reset);
        }

        tegra->clock_tsensor = devm_clk_get(&pdev->dev, "tsensor");
        if (IS_ERR(tegra->clock_tsensor)) {
                dev_err(&pdev->dev, "can't get tsensor clock\n");
                return PTR_ERR(tegra->clock_tsensor);
        }

        tegra->clock_soctherm = devm_clk_get(&pdev->dev, "soctherm");
        if (IS_ERR(tegra->clock_soctherm)) {
                dev_err(&pdev->dev, "can't get soctherm clock\n");
                return PTR_ERR(tegra->clock_soctherm);
        }

        tegra->calib = devm_kcalloc(&pdev->dev,
                                    soc->num_tsensors, sizeof(u32),
                                    GFP_KERNEL);
        if (!tegra->calib)
                return -ENOMEM;

        /* calculate shared calibration data */
        err = tegra_calc_shared_calib(soc->tfuse, &shared_calib);
        if (err)
                return err;

        /* calculate tsensor calibaration data */
        for (i = 0; i < soc->num_tsensors; ++i) {
                err = tegra_calc_tsensor_calib(&soc->tsensors[i],
                                               &shared_calib,
                                               &tegra->calib[i]);
                if (err)
                        return err;
        }

        tegra->thermctl_tzs = devm_kcalloc(&pdev->dev,
                                           soc->num_ttgs, sizeof(z),
                                           GFP_KERNEL);
        if (!tegra->thermctl_tzs)
                return -ENOMEM;

        err = soctherm_clk_enable(pdev, true);
        if (err)
                return err;

        soctherm_thermtrips_parse(pdev);

        soctherm_init_hw_throt_cdev(pdev);

        soctherm_init(pdev);

        for (i = 0; i < soc->num_ttgs; ++i) {
                struct tegra_thermctl_zone *zone =
                        devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
                if (!zone) {
                        err = -ENOMEM;
                        goto disable_clocks;
                }

                zone->reg = tegra->regs + soc->ttgs[i]->sensor_temp_offset;
                zone->dev = &pdev->dev;
                zone->sg = soc->ttgs[i];
                zone->ts = tegra;

                z = devm_thermal_zone_of_sensor_register(&pdev->dev,
                                                         soc->ttgs[i]->id, zone,
                                                         &tegra_of_thermal_ops);
                if (IS_ERR(z)) {
                        err = PTR_ERR(z);
                        dev_err(&pdev->dev, "failed to register sensor: %d\n",
                                err);
                        goto disable_clocks;
                }

                zone->tz = z;
                tegra->thermctl_tzs[soc->ttgs[i]->id] = z;

                /* Configure hw trip points */
                err = tegra_soctherm_set_hwtrips(&pdev->dev, soc->ttgs[i], z);
                if (err)
                        goto disable_clocks;
        }

        err = soctherm_interrupts_init(pdev, tegra);

        soctherm_debug_init(pdev);

        return 0;

disable_clocks:
        soctherm_clk_enable(pdev, false);

        return err;
}

static int tegra_soctherm_remove(struct platform_device *pdev)
{
        struct tegra_soctherm *tegra = platform_get_drvdata(pdev);

        debugfs_remove_recursive(tegra->debugfs_dir);

        soctherm_clk_enable(pdev, false);

        return 0;
}

static int __maybe_unused soctherm_suspend(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);

        soctherm_clk_enable(pdev, false);

        return 0;
}

static int __maybe_unused soctherm_resume(struct device *dev)
{
        struct platform_device *pdev = to_platform_device(dev);
        struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
        struct tegra_soctherm_soc *soc = tegra->soc;
        int err, i;

        err = soctherm_clk_enable(pdev, true);
        if (err) {
                dev_err(&pdev->dev,
                        "Resume failed: enable clocks failed\n");
                return err;
        }

        soctherm_init(pdev);

        for (i = 0; i < soc->num_ttgs; ++i) {
                struct thermal_zone_device *tz;

                tz = tegra->thermctl_tzs[soc->ttgs[i]->id];
                err = tegra_soctherm_set_hwtrips(dev, soc->ttgs[i], tz);
                if (err) {
                        dev_err(&pdev->dev,
                                "Resume failed: set hwtrips failed\n");
                        return err;
                }
        }

        return 0;
}

static SIMPLE_DEV_PM_OPS(tegra_soctherm_pm, soctherm_suspend, soctherm_resume);

static struct platform_driver tegra_soctherm_driver = {
        .probe = tegra_soctherm_probe,
        .remove = tegra_soctherm_remove,
        .driver = {
                .name = "tegra_soctherm",
                .pm = &tegra_soctherm_pm,
                .of_match_table = tegra_soctherm_of_match,
        },
};
module_platform_driver(tegra_soctherm_driver);

MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
MODULE_DESCRIPTION("NVIDIA Tegra SOCTHERM thermal management driver");
MODULE_LICENSE("GPL v2");