linux/drivers/thermal/tegra_soctherm.c
Sascha Hauer 17e8351a77 thermal: consistently use int for temperatures
The thermal code uses int, long and unsigned long for temperatures
in different places.

Using an unsigned type limits the thermal framework to positive
temperatures without need. Also several drivers currently will report
temperatures near UINT_MAX for temperatures below 0°C. This will probably
immediately shut the machine down due to overtemperature if started below
0°C.

'long' is 64bit on several architectures. This is not needed since INT_MAX °mC
is above the melting point of all known materials.

Consistently use a plain 'int' for temperatures throughout the thermal code and
the drivers. This only changes the places in the drivers where the temperature
is passed around as pointer, when drivers internally use another type this is
not changed.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Lukasz Majewski <l.majewski@samsung.com>
Reviewed-by: Darren Hart <dvhart@linux.intel.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Peter Feuerer <peter@piie.net>
Cc: Punit Agrawal <punit.agrawal@arm.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>
Cc: linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Peter Feuerer <peter@piie.net>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Lukasz Majewski <l.majewski@samsung.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: linux-acpi@vger.kernel.org
Cc: platform-driver-x86@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-omap@vger.kernel.org
Cc: linux-samsung-soc@vger.kernel.org
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Darren Hart <dvhart@infradead.org>
Cc: lm-sensors@lm-sensors.org
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
2015-08-03 23:15:50 +08:00

477 lines
12 KiB
C

/*
* 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/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 <soc/tegra/fuse.h>
#define SENSOR_CONFIG0 0
#define SENSOR_CONFIG0_STOP BIT(0)
#define SENSOR_CONFIG0_TALL_SHIFT 8
#define SENSOR_CONFIG0_TCALC_OVER BIT(4)
#define SENSOR_CONFIG0_OVER BIT(3)
#define SENSOR_CONFIG0_CPTR_OVER BIT(2)
#define SENSOR_CONFIG1 4
#define SENSOR_CONFIG1_TSAMPLE_SHIFT 0
#define SENSOR_CONFIG1_TIDDQ_EN_SHIFT 15
#define SENSOR_CONFIG1_TEN_COUNT_SHIFT 24
#define SENSOR_CONFIG1_TEMP_ENABLE BIT(31)
#define SENSOR_CONFIG2 8
#define SENSOR_CONFIG2_THERMA_SHIFT 16
#define SENSOR_CONFIG2_THERMB_SHIFT 0
#define SENSOR_PDIV 0x1c0
#define SENSOR_PDIV_T124 0x8888
#define SENSOR_HOTSPOT_OFF 0x1c4
#define SENSOR_HOTSPOT_OFF_T124 0x00060600
#define SENSOR_TEMP1 0x1c8
#define SENSOR_TEMP2 0x1cc
#define SENSOR_TEMP_MASK 0xffff
#define READBACK_VALUE_MASK 0xff00
#define READBACK_VALUE_SHIFT 8
#define READBACK_ADD_HALF BIT(7)
#define READBACK_NEGATE BIT(1)
#define FUSE_TSENSOR8_CALIB 0x180
#define FUSE_SPARE_REALIGNMENT_REG_0 0x1fc
#define FUSE_TSENSOR_CALIB_CP_TS_BASE_MASK 0x1fff
#define FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK (0x1fff << 13)
#define FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT 13
#define FUSE_TSENSOR8_CALIB_CP_TS_BASE_MASK 0x3ff
#define FUSE_TSENSOR8_CALIB_FT_TS_BASE_MASK (0x7ff << 10)
#define FUSE_TSENSOR8_CALIB_FT_TS_BASE_SHIFT 10
#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_CP_MASK 0x3f
#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_MASK (0x1f << 21)
#define FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_SHIFT 21
#define NOMINAL_CALIB_FT_T124 105
#define NOMINAL_CALIB_CP_T124 25
struct tegra_tsensor_configuration {
u32 tall, tsample, tiddq_en, ten_count, pdiv, tsample_ate, pdiv_ate;
};
struct tegra_tsensor {
const struct tegra_tsensor_configuration *config;
u32 base, calib_fuse_offset;
/* Correction values used to modify values read from calibration fuses */
s32 fuse_corr_alpha, fuse_corr_beta;
};
struct tegra_thermctl_zone {
void __iomem *reg;
unsigned int shift;
};
static const struct tegra_tsensor_configuration t124_tsensor_config = {
.tall = 16300,
.tsample = 120,
.tiddq_en = 1,
.ten_count = 1,
.pdiv = 8,
.tsample_ate = 480,
.pdiv_ate = 8
};
static const struct tegra_tsensor t124_tsensors[] = {
{
.config = &t124_tsensor_config,
.base = 0xc0,
.calib_fuse_offset = 0x098,
.fuse_corr_alpha = 1135400,
.fuse_corr_beta = -6266900,
},
{
.config = &t124_tsensor_config,
.base = 0xe0,
.calib_fuse_offset = 0x084,
.fuse_corr_alpha = 1122220,
.fuse_corr_beta = -5700700,
},
{
.config = &t124_tsensor_config,
.base = 0x100,
.calib_fuse_offset = 0x088,
.fuse_corr_alpha = 1127000,
.fuse_corr_beta = -6768200,
},
{
.config = &t124_tsensor_config,
.base = 0x120,
.calib_fuse_offset = 0x12c,
.fuse_corr_alpha = 1110900,
.fuse_corr_beta = -6232000,
},
{
.config = &t124_tsensor_config,
.base = 0x140,
.calib_fuse_offset = 0x158,
.fuse_corr_alpha = 1122300,
.fuse_corr_beta = -5936400,
},
{
.config = &t124_tsensor_config,
.base = 0x160,
.calib_fuse_offset = 0x15c,
.fuse_corr_alpha = 1145700,
.fuse_corr_beta = -7124600,
},
{
.config = &t124_tsensor_config,
.base = 0x180,
.calib_fuse_offset = 0x154,
.fuse_corr_alpha = 1120100,
.fuse_corr_beta = -6000500,
},
{
.config = &t124_tsensor_config,
.base = 0x1a0,
.calib_fuse_offset = 0x160,
.fuse_corr_alpha = 1106500,
.fuse_corr_beta = -6729300,
},
};
struct tegra_soctherm {
struct reset_control *reset;
struct clk *clock_tsensor;
struct clk *clock_soctherm;
void __iomem *regs;
struct thermal_zone_device *thermctl_tzs[4];
};
struct tsensor_shared_calibration {
u32 base_cp, base_ft;
u32 actual_temp_cp, actual_temp_ft;
};
static int calculate_shared_calibration(struct tsensor_shared_calibration *r)
{
u32 val, shifted_cp, shifted_ft;
int err;
err = tegra_fuse_readl(FUSE_TSENSOR8_CALIB, &val);
if (err)
return err;
r->base_cp = val & FUSE_TSENSOR8_CALIB_CP_TS_BASE_MASK;
r->base_ft = (val & FUSE_TSENSOR8_CALIB_FT_TS_BASE_MASK)
>> FUSE_TSENSOR8_CALIB_FT_TS_BASE_SHIFT;
val = ((val & FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_MASK)
>> FUSE_SPARE_REALIGNMENT_REG_SHIFT_FT_SHIFT);
shifted_ft = sign_extend32(val, 4);
err = tegra_fuse_readl(FUSE_SPARE_REALIGNMENT_REG_0, &val);
if (err)
return err;
shifted_cp = sign_extend32(val, 5);
r->actual_temp_cp = 2 * NOMINAL_CALIB_CP_T124 + shifted_cp;
r->actual_temp_ft = 2 * NOMINAL_CALIB_FT_T124 + shifted_ft;
return 0;
}
static s64 div64_s64_precise(s64 a, s64 b)
{
s64 r, al;
/* Scale up for increased precision division */
al = a << 16;
r = div64_s64(al * 2 + 1, 2 * b);
return r >> 16;
}
static int
calculate_tsensor_calibration(const struct tegra_tsensor *sensor,
const struct tsensor_shared_calibration *shared,
u32 *calib)
{
u32 val;
s32 actual_tsensor_ft, actual_tsensor_cp, delta_sens, delta_temp,
mult, div;
s16 therma, thermb;
s64 tmp;
int err;
err = tegra_fuse_readl(sensor->calib_fuse_offset, &val);
if (err)
return err;
actual_tsensor_cp = (shared->base_cp * 64) + sign_extend32(val, 12);
val = (val & FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK)
>> FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT;
actual_tsensor_ft = (shared->base_ft * 32) + sign_extend32(val, 12);
delta_sens = actual_tsensor_ft - actual_tsensor_cp;
delta_temp = shared->actual_temp_ft - shared->actual_temp_cp;
mult = sensor->config->pdiv * sensor->config->tsample_ate;
div = sensor->config->tsample * sensor->config->pdiv_ate;
therma = div64_s64_precise((s64) delta_temp * (1LL << 13) * mult,
(s64) delta_sens * div);
tmp = (s64)actual_tsensor_ft * shared->actual_temp_cp -
(s64)actual_tsensor_cp * shared->actual_temp_ft;
thermb = div64_s64_precise(tmp, (s64)delta_sens);
therma = div64_s64_precise((s64)therma * sensor->fuse_corr_alpha,
(s64)1000000LL);
thermb = div64_s64_precise((s64)thermb * sensor->fuse_corr_alpha +
sensor->fuse_corr_beta, (s64)1000000LL);
*calib = ((u16)therma << SENSOR_CONFIG2_THERMA_SHIFT) |
((u16)thermb << SENSOR_CONFIG2_THERMB_SHIFT);
return 0;
}
static int enable_tsensor(struct tegra_soctherm *tegra,
const struct tegra_tsensor *sensor,
const struct tsensor_shared_calibration *shared)
{
void __iomem *base = tegra->regs + sensor->base;
unsigned int val;
u32 calib;
int err;
err = calculate_tsensor_calibration(sensor, shared, &calib);
if (err)
return err;
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(calib, base + SENSOR_CONFIG2);
return 0;
}
/*
* 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)
{
long 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) >> zone->shift) & SENSOR_TEMP_MASK;
*out_temp = translate_temp(val);
return 0;
}
static const struct thermal_zone_of_device_ops tegra_of_thermal_ops = {
.get_temp = tegra_thermctl_get_temp,
};
static const struct of_device_id tegra_soctherm_of_match[] = {
{ .compatible = "nvidia,tegra124-soctherm" },
{ },
};
MODULE_DEVICE_TABLE(of, tegra_soctherm_of_match);
struct thermctl_zone_desc {
unsigned int offset;
unsigned int shift;
};
static const struct thermctl_zone_desc t124_thermctl_temp_zones[] = {
{ SENSOR_TEMP1, 16 },
{ SENSOR_TEMP2, 16 },
{ SENSOR_TEMP1, 0 },
{ SENSOR_TEMP2, 0 }
};
static int tegra_soctherm_probe(struct platform_device *pdev)
{
struct tegra_soctherm *tegra;
struct thermal_zone_device *tz;
struct tsensor_shared_calibration shared_calib;
struct resource *res;
unsigned int i;
int err;
const struct tegra_tsensor *tsensors = t124_tsensors;
tegra = devm_kzalloc(&pdev->dev, sizeof(*tegra), GFP_KERNEL);
if (!tegra)
return -ENOMEM;
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);
}
reset_control_assert(tegra->reset);
err = clk_prepare_enable(tegra->clock_soctherm);
if (err)
return err;
err = clk_prepare_enable(tegra->clock_tsensor);
if (err) {
clk_disable_unprepare(tegra->clock_soctherm);
return err;
}
reset_control_deassert(tegra->reset);
/* Initialize raw sensors */
err = calculate_shared_calibration(&shared_calib);
if (err)
goto disable_clocks;
for (i = 0; i < ARRAY_SIZE(t124_tsensors); ++i) {
err = enable_tsensor(tegra, tsensors + i, &shared_calib);
if (err)
goto disable_clocks;
}
writel(SENSOR_PDIV_T124, tegra->regs + SENSOR_PDIV);
writel(SENSOR_HOTSPOT_OFF_T124, tegra->regs + SENSOR_HOTSPOT_OFF);
/* Initialize thermctl sensors */
for (i = 0; i < ARRAY_SIZE(tegra->thermctl_tzs); ++i) {
struct tegra_thermctl_zone *zone =
devm_kzalloc(&pdev->dev, sizeof(*zone), GFP_KERNEL);
if (!zone) {
err = -ENOMEM;
goto unregister_tzs;
}
zone->reg = tegra->regs + t124_thermctl_temp_zones[i].offset;
zone->shift = t124_thermctl_temp_zones[i].shift;
tz = thermal_zone_of_sensor_register(&pdev->dev, i, zone,
&tegra_of_thermal_ops);
if (IS_ERR(tz)) {
err = PTR_ERR(tz);
dev_err(&pdev->dev, "failed to register sensor: %d\n",
err);
goto unregister_tzs;
}
tegra->thermctl_tzs[i] = tz;
}
return 0;
unregister_tzs:
while (i--)
thermal_zone_of_sensor_unregister(&pdev->dev,
tegra->thermctl_tzs[i]);
disable_clocks:
clk_disable_unprepare(tegra->clock_tsensor);
clk_disable_unprepare(tegra->clock_soctherm);
return err;
}
static int tegra_soctherm_remove(struct platform_device *pdev)
{
struct tegra_soctherm *tegra = platform_get_drvdata(pdev);
unsigned int i;
for (i = 0; i < ARRAY_SIZE(tegra->thermctl_tzs); ++i) {
thermal_zone_of_sensor_unregister(&pdev->dev,
tegra->thermctl_tzs[i]);
}
clk_disable_unprepare(tegra->clock_tsensor);
clk_disable_unprepare(tegra->clock_soctherm);
return 0;
}
static struct platform_driver tegra_soctherm_driver = {
.probe = tegra_soctherm_probe,
.remove = tegra_soctherm_remove,
.driver = {
.name = "tegra-soctherm",
.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");