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* Copyright (c) 2014, 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/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 "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)
/* 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)))
static const int min_low_temp = -127000;
static const int max_high_temp = 127000;
struct tegra_thermctl_zone {
void __iomem *reg;
struct device *dev;
struct thermal_zone_device *tz;
const struct tegra_tsensor_group *sg;
};
struct tegra_soctherm {
struct reset_control *reset;
struct clk *clock_tsensor;
struct clk *clock_soctherm;
void __iomem *regs;
struct thermal_zone_device **thermctl_tzs;
u32 *calib;
struct tegra_soctherm_soc *soc;
struct dentry *debugfs_dir;
};
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;
}
static int
thermtrip_program(struct device *dev, const struct tegra_tsensor_group *sg,
int trip_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;
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)
return 0;
return thermtrip_program(dev, sg, temp);
}
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,
};
/**
* enforce_temp_range() - check and enforce temperature range [min, max]
* @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;
}
/**
* tegra_soctherm_set_hwtrips() - set HW trip point from DT data
* @dev: struct device * of the SOC_THERM instance
*
* Configure the SOC_THERM HW trip points, setting "THERMTRIP"
* trip points , using "critical" type trip_temp from thermal
* zone.
* After they have been configured, THERMTRIP 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"
*/
static int tegra_soctherm_set_hwtrips(struct device *dev,
const struct tegra_tsensor_group *sg,
struct thermal_zone_device *tz)
{
int temperature;
int ret;
ret = tz->ops->get_crit_temp(tz, &temperature);
if (ret) {
dev_warn(dev, "thermtrip: %s: missing critical temperature\n",
sg->name);
return ret;
}
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);
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;
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));
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);
}
return 0;
}
static int regs_open(struct inode *inode, struct file *file)
{
return single_open(file, regs_show, inode->i_private);
}
static const struct file_operations regs_fops = {
.open = regs_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void soctherm_debug_init(struct platform_device *pdev)
{
struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
struct dentry *root, *file;
root = debugfs_create_dir("soctherm", NULL);
if (!root) {
dev_err(&pdev->dev, "failed to create debugfs directory\n");
return;
}
tegra->debugfs_dir = root;
file = debugfs_create_file("reg_contents", 0644, root,
pdev, ®s_fops);
if (!file) {
dev_err(&pdev->dev, "failed to create debugfs file\n");
debugfs_remove_recursive(tegra->debugfs_dir);
tegra->debugfs_dir = NULL;
}
}
#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 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);
}
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;
dev_set_drvdata(&pdev->dev, tegra);
tegra->soc = soc;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
tegra->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(tegra->regs))
return PTR_ERR(tegra->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_kzalloc(&pdev->dev,
sizeof(u32) * soc->num_tsensors,
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_kzalloc(&pdev->dev,
sizeof(*z) * soc->num_ttgs,
GFP_KERNEL);
if (!tegra->thermctl_tzs)
return -ENOMEM;
err = soctherm_clk_enable(pdev, true);
if (err)
return err;
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];
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 */
tegra_soctherm_set_hwtrips(&pdev->dev, soc->ttgs[i], z);
}
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];
tegra_soctherm_set_hwtrips(dev, soc->ttgs[i], tz);
}
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");
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