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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 285 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
160 lines
4.8 KiB
C
160 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014-2016, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <soc/tegra/fuse.h>
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#include "soctherm.h"
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#define NOMINAL_CALIB_FT 105
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#define NOMINAL_CALIB_CP 25
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#define FUSE_TSENSOR_CALIB_CP_TS_BASE_MASK 0x1fff
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#define FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK (0x1fff << 13)
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#define FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT 13
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#define FUSE_TSENSOR_COMMON 0x180
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/*
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* Tegra210: Layout of bits in FUSE_TSENSOR_COMMON:
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* 3 2 1 0
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | BASE_FT | BASE_CP | SHFT_FT | SHIFT_CP |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Tegra12x, etc:
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* In chips prior to Tegra210, this fuse was incorrectly sized as 26 bits,
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* and didn't hold SHIFT_CP in [31:26]. Therefore these missing six bits
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* were obtained via the FUSE_SPARE_REALIGNMENT_REG register [5:0].
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*
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* FUSE_TSENSOR_COMMON:
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* 3 2 1 0
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |-----------| SHFT_FT | BASE_FT | BASE_CP |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* FUSE_SPARE_REALIGNMENT_REG:
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* 3 2 1 0
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* 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |---------------------------------------------------| SHIFT_CP |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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#define CALIB_COEFFICIENT 1000000LL
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/**
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* div64_s64_precise() - wrapper for div64_s64()
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* @a: the dividend
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* @b: the divisor
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*
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* Implements division with fairly accurate rounding instead of truncation by
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* shifting the dividend to the left by 16 so that the quotient has a
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* much higher precision.
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*
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* Return: the quotient of a / b.
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*/
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static s64 div64_s64_precise(s64 a, s32 b)
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{
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s64 r, al;
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/* Scale up for increased precision division */
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al = a << 16;
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r = div64_s64(al * 2 + 1, 2 * b);
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return r >> 16;
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}
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int tegra_calc_shared_calib(const struct tegra_soctherm_fuse *tfuse,
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struct tsensor_shared_calib *shared)
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{
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u32 val;
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s32 shifted_cp, shifted_ft;
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int err;
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err = tegra_fuse_readl(FUSE_TSENSOR_COMMON, &val);
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if (err)
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return err;
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shared->base_cp = (val & tfuse->fuse_base_cp_mask) >>
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tfuse->fuse_base_cp_shift;
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shared->base_ft = (val & tfuse->fuse_base_ft_mask) >>
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tfuse->fuse_base_ft_shift;
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shifted_ft = (val & tfuse->fuse_shift_ft_mask) >>
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tfuse->fuse_shift_ft_shift;
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shifted_ft = sign_extend32(shifted_ft, 4);
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if (tfuse->fuse_spare_realignment) {
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err = tegra_fuse_readl(tfuse->fuse_spare_realignment, &val);
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if (err)
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return err;
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}
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shifted_cp = sign_extend32(val, 5);
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shared->actual_temp_cp = 2 * NOMINAL_CALIB_CP + shifted_cp;
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shared->actual_temp_ft = 2 * NOMINAL_CALIB_FT + shifted_ft;
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return 0;
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}
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int tegra_calc_tsensor_calib(const struct tegra_tsensor *sensor,
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const struct tsensor_shared_calib *shared,
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u32 *calibration)
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{
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const struct tegra_tsensor_group *sensor_group;
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u32 val, calib;
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s32 actual_tsensor_ft, actual_tsensor_cp;
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s32 delta_sens, delta_temp;
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s32 mult, div;
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s16 therma, thermb;
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s64 temp;
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int err;
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sensor_group = sensor->group;
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err = tegra_fuse_readl(sensor->calib_fuse_offset, &val);
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if (err)
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return err;
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actual_tsensor_cp = (shared->base_cp * 64) + sign_extend32(val, 12);
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val = (val & FUSE_TSENSOR_CALIB_FT_TS_BASE_MASK) >>
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FUSE_TSENSOR_CALIB_FT_TS_BASE_SHIFT;
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actual_tsensor_ft = (shared->base_ft * 32) + sign_extend32(val, 12);
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delta_sens = actual_tsensor_ft - actual_tsensor_cp;
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delta_temp = shared->actual_temp_ft - shared->actual_temp_cp;
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mult = sensor_group->pdiv * sensor->config->tsample_ate;
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div = sensor->config->tsample * sensor_group->pdiv_ate;
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temp = (s64)delta_temp * (1LL << 13) * mult;
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therma = div64_s64_precise(temp, (s64)delta_sens * div);
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temp = ((s64)actual_tsensor_ft * shared->actual_temp_cp) -
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((s64)actual_tsensor_cp * shared->actual_temp_ft);
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thermb = div64_s64_precise(temp, delta_sens);
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temp = (s64)therma * sensor->fuse_corr_alpha;
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therma = div64_s64_precise(temp, CALIB_COEFFICIENT);
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temp = (s64)thermb * sensor->fuse_corr_alpha + sensor->fuse_corr_beta;
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thermb = div64_s64_precise(temp, CALIB_COEFFICIENT);
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calib = ((u16)therma << SENSOR_CONFIG2_THERMA_SHIFT) |
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((u16)thermb << SENSOR_CONFIG2_THERMB_SHIFT);
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*calibration = calib;
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return 0;
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}
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MODULE_AUTHOR("Wei Ni <wni@nvidia.com>");
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MODULE_DESCRIPTION("Tegra SOCTHERM fuse management");
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MODULE_LICENSE("GPL v2");
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