269 lines
8.2 KiB
C
269 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* TI Bandgap temperature sensor driver for K3 SoC Family
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*
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* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
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*/
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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#include <linux/thermal.h>
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#include <linux/types.h>
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#include "thermal_hwmon.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 0x80
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#define K3_VTM_REGS_PER_TS 0x10
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#define K3_VTM_TS_STAT_DTEMP_MASK 0x3ff
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#define K3_VTM_TMPSENS_CTRL_CBIASSEL BIT(0)
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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_ADC_BEGIN_VAL 540
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#define K3_VTM_ADC_END_VAL 944
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static const int k3_adc_to_temp[] = {
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-40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200,
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-37800, -37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200,
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-33800, -33400, -33000, -32600, -32200, -31800, -31400, -31000, -30600,
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-30200, -29800, -29400, -29000, -28600, -28200, -27700, -27100, -26600,
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-26200, -25800, -25400, -25000, -24600, -24200, -23800, -23400, -23000,
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-22600, -22200, -21800, -21400, -21000, -20500, -19900, -19400, -19000,
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-18600, -18200, -17800, -17400, -17000, -16600, -16200, -15800, -15400,
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-15000, -14600, -14200, -13800, -13400, -13000, -12500, -11900, -11400,
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-11000, -10600, -10200, -9800, -9400, -9000, -8600, -8200, -7800, -7400,
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-7000, -6600, -6200, -5800, -5400, -5000, -4500, -3900, -3400, -3000,
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-2600, -2200, -1800, -1400, -1000, -600, -200, 200, 600, 1000, 1400,
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1800, 2200, 2600, 3000, 3400, 3900, 4500, 5000, 5400, 5800, 6200, 6600,
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7000, 7400, 7800, 8200, 8600, 9000, 9400, 9800, 10200, 10600, 11000,
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11400, 11800, 12200, 12700, 13300, 13800, 14200, 14600, 15000, 15400,
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15800, 16200, 16600, 17000, 17400, 17800, 18200, 18600, 19000, 19400,
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19800, 20200, 20600, 21000, 21400, 21900, 22500, 23000, 23400, 23800,
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24200, 24600, 25000, 25400, 25800, 26200, 26600, 27000, 27400, 27800,
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28200, 28600, 29000, 29400, 29800, 30200, 30600, 31000, 31400, 31900,
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32500, 33000, 33400, 33800, 34200, 34600, 35000, 35400, 35800, 36200,
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36600, 37000, 37400, 37800, 38200, 38600, 39000, 39400, 39800, 40200,
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40600, 41000, 41400, 41800, 42200, 42600, 43100, 43700, 44200, 44600,
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45000, 45400, 45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600,
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49000, 49400, 49800, 50200, 50600, 51000, 51400, 51800, 52200, 52600,
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53000, 53400, 53800, 54200, 54600, 55000, 55400, 55900, 56500, 57000,
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57400, 57800, 58200, 58600, 59000, 59400, 59800, 60200, 60600, 61000,
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61400, 61800, 62200, 62600, 63000, 63400, 63800, 64200, 64600, 65000,
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65400, 65800, 66200, 66600, 67000, 67400, 67800, 68200, 68600, 69000,
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69400, 69800, 70200, 70600, 71000, 71500, 72100, 72600, 73000, 73400,
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73800, 74200, 74600, 75000, 75400, 75800, 76200, 76600, 77000, 77400,
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77800, 78200, 78600, 79000, 79400, 79800, 80200, 80600, 81000, 81400,
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81800, 82200, 82600, 83000, 83400, 83800, 84200, 84600, 85000, 85400,
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85800, 86200, 86600, 87000, 87400, 87800, 88200, 88600, 89000, 89400,
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89800, 90200, 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400,
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93800, 94200, 94600, 95000, 95400, 95800, 96200, 96600, 97000, 97500,
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98100, 98600, 99000, 99400, 99800, 100200, 100600, 101000, 101400,
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101800, 102200, 102600, 103000, 103400, 103800, 104200, 104600, 105000,
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105400, 105800, 106200, 106600, 107000, 107400, 107800, 108200, 108600,
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109000, 109400, 109800, 110200, 110600, 111000, 111400, 111800, 112200,
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112600, 113000, 113400, 113800, 114200, 114600, 115000, 115400, 115800,
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116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, 119400,
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119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000,
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123400, 123800, 124200, 124600, 124900, 125000,
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};
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struct k3_bandgap {
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void __iomem *base;
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const struct k3_bandgap_data *conf;
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};
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/* common data structures */
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struct k3_thermal_data {
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struct thermal_zone_device *tzd;
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struct k3_bandgap *bgp;
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int sensor_id;
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u32 ctrl_offset;
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u32 stat_offset;
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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 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_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. There
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* is a variation of the order for 8-10 degree centigrade.
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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 < K3_VTM_ADC_BEGIN_VAL || dtemp > K3_VTM_ADC_END_VAL)
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return -EINVAL;
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*temp = k3_adc_to_temp[dtemp - K3_VTM_ADC_BEGIN_VAL];
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return 0;
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}
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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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struct k3_thermal_data *data = thermal_zone_device_priv(tz);
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int ret = 0;
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ret = k3_bgp_read_temp(data, temp);
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if (ret)
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return ret;
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return ret;
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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 const struct of_device_id of_k3_bandgap_match[];
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static int k3_bandgap_probe(struct platform_device *pdev)
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{
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int ret = 0, cnt, val, id;
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struct resource *res;
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struct device *dev = &pdev->dev;
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struct k3_bandgap *bgp;
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struct k3_thermal_data *data;
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if (ARRAY_SIZE(k3_adc_to_temp) != (K3_VTM_ADC_END_VAL + 1 -
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K3_VTM_ADC_BEGIN_VAL))
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return -EINVAL;
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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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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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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(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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/* Register the thermal sensors */
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for (id = 0; id < cnt; id++) {
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data[id].sensor_id = id;
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data[id].bgp = bgp;
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data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET +
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id * K3_VTM_REGS_PER_TS;
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data[id].stat_offset = data[id].ctrl_offset + 0x8;
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val = readl(data[id].bgp->base + data[id].ctrl_offset);
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val |= (K3_VTM_TMPSENS_CTRL_SOC |
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K3_VTM_TMPSENS_CTRL_CLRZ |
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K3_VTM_TMPSENS_CTRL_CLKON_REQ);
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val &= ~K3_VTM_TMPSENS_CTRL_CBIASSEL;
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writel(val, data[id].bgp->base + data[id].ctrl_offset);
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data[id].tzd =
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devm_thermal_of_zone_register(dev, id,
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&data[id],
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&k3_of_thermal_ops);
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if (IS_ERR(data[id].tzd)) {
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dev_err(dev, "thermal zone device is NULL\n");
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ret = PTR_ERR(data[id].tzd);
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goto err_alloc;
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}
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devm_thermal_add_hwmon_sysfs(dev, data[id].tzd);
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}
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platform_set_drvdata(pdev, bgp);
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return 0;
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err_alloc:
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pm_runtime_put_sync(dev);
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pm_runtime_disable(dev);
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return ret;
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}
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static int k3_bandgap_remove(struct platform_device *pdev)
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{
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pm_runtime_put_sync(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static const struct of_device_id of_k3_bandgap_match[] = {
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{
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.compatible = "ti,am654-vtm",
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},
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, of_k3_bandgap_match);
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static struct platform_driver k3_bandgap_sensor_driver = {
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.probe = k3_bandgap_probe,
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.remove = k3_bandgap_remove,
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.driver = {
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.name = "k3-soc-thermal",
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.of_match_table = of_k3_bandgap_match,
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},
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};
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module_platform_driver(k3_bandgap_sensor_driver);
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MODULE_DESCRIPTION("K3 bandgap temperature sensor driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
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