/*
* 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 long 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, long *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");
