569 lines
14 KiB
C
569 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* TI Bandgap temperature sensor driver for J72XX SoC Family
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*
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* Copyright (C) 2021 Texas Instruments Incorporated - http://www.ti.com/
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*/
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#include <linux/math.h>
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#include <linux/math64.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/pm_runtime.h>
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#include <linux/err.h>
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#include <linux/types.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include <linux/thermal.h>
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#include <linux/of.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#define K3_VTM_DEVINFO_PWR0_OFFSET 0x4
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#define K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK 0xf0
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#define K3_VTM_TMPSENS0_CTRL_OFFSET 0x300
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#define K3_VTM_MISC_CTRL_OFFSET 0xc
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#define K3_VTM_TMPSENS_STAT_OFFSET 0x8
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#define K3_VTM_ANYMAXT_OUTRG_ALERT_EN 0x1
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#define K3_VTM_MISC_CTRL2_OFFSET 0x10
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#define K3_VTM_TS_STAT_DTEMP_MASK 0x3ff
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#define K3_VTM_MAX_NUM_TS 8
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#define K3_VTM_TMPSENS_CTRL_SOC BIT(5)
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#define K3_VTM_TMPSENS_CTRL_CLRZ BIT(6)
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#define K3_VTM_TMPSENS_CTRL_CLKON_REQ BIT(7)
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#define K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN BIT(11)
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#define K3_VTM_CORRECTION_TEMP_CNT 3
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#define MINUS40CREF 5
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#define PLUS30CREF 253
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#define PLUS125CREF 730
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#define PLUS150CREF 940
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#define TABLE_SIZE 1024
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#define MAX_TEMP 123000
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#define COOL_DOWN_TEMP 105000
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#define FACTORS_REDUCTION 13
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static int *derived_table;
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static int compute_value(int index, const s64 *factors, int nr_factors,
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int reduction)
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{
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s64 value = 0;
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int i;
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for (i = 0; i < nr_factors; i++)
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value += factors[i] * int_pow(index, i);
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return (int)div64_s64(value, int_pow(10, reduction));
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}
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static void init_table(int factors_size, int *table, const s64 *factors)
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{
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int i;
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for (i = 0; i < TABLE_SIZE; i++)
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table[i] = compute_value(i, factors, factors_size,
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FACTORS_REDUCTION);
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}
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/**
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* struct err_values - structure containing error/reference values
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* @refs: reference error values for -40C, 30C, 125C & 150C
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* @errs: Actual error values for -40C, 30C, 125C & 150C read from the efuse
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*/
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struct err_values {
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int refs[4];
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int errs[4];
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};
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static void create_table_segments(struct err_values *err_vals, int seg,
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int *ref_table)
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{
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int m = 0, c, num, den, i, err, idx1, idx2, err1, err2, ref1, ref2;
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if (seg == 0)
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idx1 = 0;
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else
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idx1 = err_vals->refs[seg];
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idx2 = err_vals->refs[seg + 1];
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err1 = err_vals->errs[seg];
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err2 = err_vals->errs[seg + 1];
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ref1 = err_vals->refs[seg];
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ref2 = err_vals->refs[seg + 1];
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/*
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* Calculate the slope with adc values read from the register
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* as the y-axis param and err in adc value as x-axis param
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*/
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num = ref2 - ref1;
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den = err2 - err1;
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if (den)
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m = num / den;
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c = ref2 - m * err2;
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/*
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* Take care of divide by zero error if error values are same
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* Or when the slope is 0
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*/
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if (den != 0 && m != 0) {
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for (i = idx1; i <= idx2; i++) {
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err = (i - c) / m;
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if (((i + err) < 0) || ((i + err) >= TABLE_SIZE))
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continue;
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derived_table[i] = ref_table[i + err];
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}
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} else { /* Constant error take care of divide by zero */
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for (i = idx1; i <= idx2; i++) {
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if (((i + err1) < 0) || ((i + err1) >= TABLE_SIZE))
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continue;
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derived_table[i] = ref_table[i + err1];
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}
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}
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}
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static int prep_lookup_table(struct err_values *err_vals, int *ref_table)
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{
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int inc, i, seg;
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/*
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* Fill up the lookup table under 3 segments
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* region -40C to +30C
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* region +30C to +125C
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* region +125C to +150C
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*/
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for (seg = 0; seg < 3; seg++)
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create_table_segments(err_vals, seg, ref_table);
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/* Get to the first valid temperature */
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i = 0;
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while (!derived_table[i])
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i++;
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/*
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* Get to the last zero index and back fill the temperature for
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* sake of continuity
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*/
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if (i) {
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/* 300 milli celsius steps */
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while (i--)
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derived_table[i] = derived_table[i + 1] - 300;
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}
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/*
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* Fill the last trailing 0s which are unfilled with increments of
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* 100 milli celsius till 1023 code
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*/
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i = TABLE_SIZE - 1;
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while (!derived_table[i])
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i--;
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i++;
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inc = 1;
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while (i < TABLE_SIZE) {
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derived_table[i] = derived_table[i - 1] + inc * 100;
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i++;
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}
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return 0;
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}
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struct k3_thermal_data;
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struct k3_j72xx_bandgap {
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struct device *dev;
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void __iomem *base;
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void __iomem *cfg2_base;
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struct k3_thermal_data *ts_data[K3_VTM_MAX_NUM_TS];
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};
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/* common data structures */
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struct k3_thermal_data {
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struct k3_j72xx_bandgap *bgp;
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u32 ctrl_offset;
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u32 stat_offset;
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};
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static int two_cmp(int tmp, int mask)
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{
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tmp = ~(tmp);
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tmp &= mask;
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tmp += 1;
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/* Return negative value */
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return (0 - tmp);
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}
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static unsigned int vtm_get_best_value(unsigned int s0, unsigned int s1,
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unsigned int s2)
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{
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int d01 = abs(s0 - s1);
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int d02 = abs(s0 - s2);
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int d12 = abs(s1 - s2);
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if (d01 <= d02 && d01 <= d12)
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return (s0 + s1) / 2;
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if (d02 <= d01 && d02 <= d12)
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return (s0 + s2) / 2;
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return (s1 + s2) / 2;
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}
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static inline int k3_bgp_read_temp(struct k3_thermal_data *devdata,
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int *temp)
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{
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struct k3_j72xx_bandgap *bgp;
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unsigned int dtemp, s0, s1, s2;
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bgp = devdata->bgp;
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/*
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* Errata is applicable for am654 pg 1.0 silicon/J7ES. There
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* is a variation of the order for certain degree centigrade on AM654.
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* Work around that by getting the average of two closest
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* readings out of three readings everytime we want to
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* report temperatures.
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*
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* Errata workaround.
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*/
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s0 = readl(bgp->base + devdata->stat_offset) &
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K3_VTM_TS_STAT_DTEMP_MASK;
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s1 = readl(bgp->base + devdata->stat_offset) &
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K3_VTM_TS_STAT_DTEMP_MASK;
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s2 = readl(bgp->base + devdata->stat_offset) &
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K3_VTM_TS_STAT_DTEMP_MASK;
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dtemp = vtm_get_best_value(s0, s1, s2);
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if (dtemp < 0 || dtemp >= TABLE_SIZE)
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return -EINVAL;
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*temp = derived_table[dtemp];
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return 0;
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}
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/* Get temperature callback function for thermal zone */
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static int k3_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
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{
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return k3_bgp_read_temp(tz->devdata, temp);
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}
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static const struct thermal_zone_device_ops k3_of_thermal_ops = {
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.get_temp = k3_thermal_get_temp,
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};
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static int k3_j72xx_bandgap_temp_to_adc_code(int temp)
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{
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int low = 0, high = TABLE_SIZE - 1, mid;
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if (temp > 160000 || temp < -50000)
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return -EINVAL;
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/* Binary search to find the adc code */
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while (low < (high - 1)) {
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mid = (low + high) / 2;
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if (temp <= derived_table[mid])
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high = mid;
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else
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low = mid;
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}
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return mid;
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}
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static void get_efuse_values(int id, struct k3_thermal_data *data, int *err,
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void __iomem *fuse_base)
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{
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int i, tmp, pow;
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int ct_offsets[5][K3_VTM_CORRECTION_TEMP_CNT] = {
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{ 0x0, 0x8, 0x4 },
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{ 0x0, 0x8, 0x4 },
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{ 0x0, -1, 0x4 },
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{ 0x0, 0xC, -1 },
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{ 0x0, 0xc, 0x8 }
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};
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int ct_bm[5][K3_VTM_CORRECTION_TEMP_CNT] = {
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{ 0x3f, 0x1fe000, 0x1ff },
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{ 0xfc0, 0x1fe000, 0x3fe00 },
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{ 0x3f000, 0x7f800000, 0x7fc0000 },
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{ 0xfc0000, 0x1fe0, 0x1f800000 },
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{ 0x3f000000, 0x1fe000, 0x1ff0 }
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};
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for (i = 0; i < 3; i++) {
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/* Extract the offset value using bit-mask */
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if (ct_offsets[id][i] == -1 && i == 1) {
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/* 25C offset Case of Sensor 2 split between 2 regs */
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tmp = (readl(fuse_base + 0x8) & 0xE0000000) >> (29);
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tmp |= ((readl(fuse_base + 0xC) & 0x1F) << 3);
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pow = tmp & 0x80;
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} else if (ct_offsets[id][i] == -1 && i == 2) {
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/* 125C Case of Sensor 3 split between 2 regs */
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tmp = (readl(fuse_base + 0x4) & 0xF8000000) >> (27);
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tmp |= ((readl(fuse_base + 0x8) & 0xF) << 5);
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pow = tmp & 0x100;
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} else {
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tmp = readl(fuse_base + ct_offsets[id][i]);
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tmp &= ct_bm[id][i];
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tmp = tmp >> __ffs(ct_bm[id][i]);
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/* Obtain the sign bit pow*/
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pow = ct_bm[id][i] >> __ffs(ct_bm[id][i]);
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pow += 1;
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pow /= 2;
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}
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/* Check for negative value */
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if (tmp & pow) {
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/* 2's complement value */
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tmp = two_cmp(tmp, ct_bm[id][i] >> __ffs(ct_bm[id][i]));
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}
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err[i] = tmp;
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}
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/* Err value for 150C is set to 0 */
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err[i] = 0;
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}
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static void print_look_up_table(struct device *dev, int *ref_table)
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{
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int i;
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dev_dbg(dev, "The contents of derived array\n");
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dev_dbg(dev, "Code Temperature\n");
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for (i = 0; i < TABLE_SIZE; i++)
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dev_dbg(dev, "%d %d %d\n", i, derived_table[i], ref_table[i]);
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}
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struct k3_j72xx_bandgap_data {
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const bool has_errata_i2128;
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};
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static int k3_j72xx_bandgap_probe(struct platform_device *pdev)
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{
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int ret = 0, cnt, val, id;
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int high_max, low_temp;
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struct resource *res;
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struct device *dev = &pdev->dev;
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struct k3_j72xx_bandgap *bgp;
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struct k3_thermal_data *data;
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bool workaround_needed = false;
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const struct k3_j72xx_bandgap_data *driver_data;
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struct thermal_zone_device *ti_thermal;
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int *ref_table;
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struct err_values err_vals;
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void __iomem *fuse_base;
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const s64 golden_factors[] = {
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-490019999999999936,
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3251200000000000,
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-1705800000000,
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603730000,
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-92627,
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};
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const s64 pvt_wa_factors[] = {
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-415230000000000000,
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3126600000000000,
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-1157800000000,
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};
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bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
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if (!bgp)
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return -ENOMEM;
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bgp->dev = dev;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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bgp->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(bgp->base))
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return PTR_ERR(bgp->base);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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bgp->cfg2_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(bgp->cfg2_base))
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return PTR_ERR(bgp->cfg2_base);
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driver_data = of_device_get_match_data(dev);
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if (driver_data)
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workaround_needed = driver_data->has_errata_i2128;
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/*
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* Some of TI's J721E SoCs require a software trimming procedure
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* for the temperature monitors to function properly. To determine
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* if this particular SoC is NOT affected, both bits in the
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* WKUP_SPARE_FUSE0[31:30] will be set (0xC0000000) indicating
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* when software trimming should NOT be applied.
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*
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* https://www.ti.com/lit/er/sprz455c/sprz455c.pdf
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*/
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if (workaround_needed) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
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fuse_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(fuse_base))
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return PTR_ERR(fuse_base);
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if ((readl(fuse_base) & 0xc0000000) == 0xc0000000)
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workaround_needed = false;
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}
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dev_dbg(bgp->dev, "Work around %sneeded\n",
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workaround_needed ? "" : "not ");
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pm_runtime_enable(dev);
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ret = pm_runtime_get_sync(dev);
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if (ret < 0) {
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pm_runtime_put_noidle(dev);
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pm_runtime_disable(dev);
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return ret;
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}
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/* Get the sensor count in the VTM */
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val = readl(bgp->base + K3_VTM_DEVINFO_PWR0_OFFSET);
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cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
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cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
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data = devm_kcalloc(bgp->dev, cnt, sizeof(*data), GFP_KERNEL);
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if (!data) {
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ret = -ENOMEM;
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goto err_alloc;
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}
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ref_table = kzalloc(sizeof(*ref_table) * TABLE_SIZE, GFP_KERNEL);
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if (!ref_table) {
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ret = -ENOMEM;
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goto err_alloc;
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}
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derived_table = devm_kzalloc(bgp->dev, sizeof(*derived_table) * TABLE_SIZE,
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GFP_KERNEL);
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if (!derived_table) {
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ret = -ENOMEM;
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goto err_free_ref_table;
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}
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if (!workaround_needed)
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init_table(5, ref_table, golden_factors);
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else
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init_table(3, ref_table, pvt_wa_factors);
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/* Register the thermal sensors */
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for (id = 0; id < cnt; id++) {
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data[id].bgp = bgp;
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data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET + id * 0x20;
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data[id].stat_offset = data[id].ctrl_offset +
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K3_VTM_TMPSENS_STAT_OFFSET;
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if (workaround_needed) {
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/* ref adc values for -40C, 30C & 125C respectively */
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err_vals.refs[0] = MINUS40CREF;
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err_vals.refs[1] = PLUS30CREF;
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err_vals.refs[2] = PLUS125CREF;
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err_vals.refs[3] = PLUS150CREF;
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get_efuse_values(id, &data[id], err_vals.errs, fuse_base);
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}
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if (id == 0 && workaround_needed)
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prep_lookup_table(&err_vals, ref_table);
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else if (id == 0 && !workaround_needed)
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memcpy(derived_table, ref_table, TABLE_SIZE * 4);
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val = readl(data[id].bgp->cfg2_base + data[id].ctrl_offset);
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val |= (K3_VTM_TMPSENS_CTRL_MAXT_OUTRG_EN |
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K3_VTM_TMPSENS_CTRL_SOC |
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K3_VTM_TMPSENS_CTRL_CLRZ | BIT(4));
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writel(val, data[id].bgp->cfg2_base + data[id].ctrl_offset);
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bgp->ts_data[id] = &data[id];
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ti_thermal = devm_thermal_of_zone_register(bgp->dev, id, &data[id],
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&k3_of_thermal_ops);
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if (IS_ERR(ti_thermal)) {
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dev_err(bgp->dev, "thermal zone device is NULL\n");
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ret = PTR_ERR(ti_thermal);
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goto err_free_ref_table;
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}
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}
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/*
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* Program TSHUT thresholds
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* Step 1: set the thresholds to ~123C and 105C WKUP_VTM_MISC_CTRL2
|
|
* Step 2: WKUP_VTM_TMPSENS_CTRL_j set the MAXT_OUTRG_EN bit
|
|
* This is already taken care as per of init
|
|
* Step 3: WKUP_VTM_MISC_CTRL set the ANYMAXT_OUTRG_ALERT_EN bit
|
|
*/
|
|
high_max = k3_j72xx_bandgap_temp_to_adc_code(MAX_TEMP);
|
|
low_temp = k3_j72xx_bandgap_temp_to_adc_code(COOL_DOWN_TEMP);
|
|
|
|
writel((low_temp << 16) | high_max, data[0].bgp->cfg2_base +
|
|
K3_VTM_MISC_CTRL2_OFFSET);
|
|
mdelay(100);
|
|
writel(K3_VTM_ANYMAXT_OUTRG_ALERT_EN, data[0].bgp->cfg2_base +
|
|
K3_VTM_MISC_CTRL_OFFSET);
|
|
|
|
platform_set_drvdata(pdev, bgp);
|
|
|
|
print_look_up_table(dev, ref_table);
|
|
/*
|
|
* Now that the derived_table has the appropriate look up values
|
|
* Free up the ref_table
|
|
*/
|
|
kfree(ref_table);
|
|
|
|
return 0;
|
|
|
|
err_free_ref_table:
|
|
kfree(ref_table);
|
|
|
|
err_alloc:
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int k3_j72xx_bandgap_remove(struct platform_device *pdev)
|
|
{
|
|
pm_runtime_put_sync(&pdev->dev);
|
|
pm_runtime_disable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct k3_j72xx_bandgap_data k3_j72xx_bandgap_j721e_data = {
|
|
.has_errata_i2128 = true,
|
|
};
|
|
|
|
static const struct k3_j72xx_bandgap_data k3_j72xx_bandgap_j7200_data = {
|
|
.has_errata_i2128 = false,
|
|
};
|
|
|
|
static const struct of_device_id of_k3_j72xx_bandgap_match[] = {
|
|
{
|
|
.compatible = "ti,j721e-vtm",
|
|
.data = &k3_j72xx_bandgap_j721e_data,
|
|
},
|
|
{
|
|
.compatible = "ti,j7200-vtm",
|
|
.data = &k3_j72xx_bandgap_j7200_data,
|
|
},
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_k3_j72xx_bandgap_match);
|
|
|
|
static struct platform_driver k3_j72xx_bandgap_sensor_driver = {
|
|
.probe = k3_j72xx_bandgap_probe,
|
|
.remove = k3_j72xx_bandgap_remove,
|
|
.driver = {
|
|
.name = "k3-j72xx-soc-thermal",
|
|
.of_match_table = of_k3_j72xx_bandgap_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(k3_j72xx_bandgap_sensor_driver);
|
|
|
|
MODULE_DESCRIPTION("K3 bandgap temperature sensor driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
|