1 /* 2 * TI Bandgap temperature sensor driver 3 * 4 * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/ 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation version 2. 9 * 10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether express or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * Taken from Linux v4.9 (drivers/thermal/ti-soc-thermal/ti-bandgap.c) 16 * and ported to uboot. 17 * 18 */ 19 20 #include <asm/io.h> 21 #include <dm.h> 22 #include <thermal.h> 23 24 #define CTRL_CORE_TEMP_SENSOR_MPU 0 25 #define DRA752_ADC_START_VALUE 540 26 27 struct ti_bandgap { 28 ulong base; 29 int temperature; /* in mili degree celsius */ 30 }; 31 32 /* 33 * DRA752 : Temperature values in milli degree celsius 34 * ADC code values from 540 to 945 35 */ 36 static int dra752_adc_to_temp[] = { 37 /* Index 540 - 549 */ 38 -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200, 39 -37800, 40 /* Index 550 - 559 */ 41 -37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200, -33800, 42 -33400, 43 /* Index 560 - 569 */ 44 -33000, -32600, -32200, -31800, -31400, -31000, -30600, -30200, -29800, 45 -29400, 46 /* Index 570 - 579 */ 47 -29000, -28600, -28200, -27700, -27100, -26600, -26200, -25800, -25400, 48 -25000, 49 /* Index 580 - 589 */ 50 -24600, -24200, -23800, -23400, -23000, -22600, -22200, -21800, -21400, 51 -21000, 52 /* Index 590 - 599 */ 53 -20500, -19900, -19400, -19000, -18600, -18200, -17800, -17400, -17000, 54 -16600, 55 /* Index 600 - 609 */ 56 -16200, -15800, -15400, -15000, -14600, -14200, -13800, -13400, -13000, 57 -12500, 58 /* Index 610 - 619 */ 59 -11900, -11400, -11000, -10600, -10200, -9800, -9400, -9000, -8600, 60 -8200, 61 /* Index 620 - 629 */ 62 -7800, -7400, -7000, -6600, -6200, -5800, -5400, -5000, -4500, 63 -3900, 64 /* Index 630 - 639 */ 65 -3400, -3000, -2600, -2200, -1800, -1400, -1000, -600, -200, 66 200, 67 /* Index 640 - 649 */ 68 600, 1000, 1400, 1800, 2200, 2600, 3000, 3400, 3900, 69 4500, 70 /* Index 650 - 659 */ 71 5000, 5400, 5800, 6200, 6600, 7000, 7400, 7800, 8200, 72 8600, 73 /* Index 660 - 669 */ 74 9000, 9400, 9800, 10200, 10600, 11000, 11400, 11800, 12200, 75 12700, 76 /* Index 670 - 679 */ 77 13300, 13800, 14200, 14600, 15000, 15400, 15800, 16200, 16600, 78 17000, 79 /* Index 680 - 689 */ 80 17400, 17800, 18200, 18600, 19000, 19400, 19800, 20200, 20600, 81 21000, 82 /* Index 690 - 699 */ 83 21400, 21900, 22500, 23000, 23400, 23800, 24200, 24600, 25000, 84 25400, 85 /* Index 700 - 709 */ 86 25800, 26200, 26600, 27000, 27400, 27800, 28200, 28600, 29000, 87 29400, 88 /* Index 710 - 719 */ 89 29800, 30200, 30600, 31000, 31400, 31900, 32500, 33000, 33400, 90 33800, 91 /* Index 720 - 729 */ 92 34200, 34600, 35000, 35400, 35800, 36200, 36600, 37000, 37400, 93 37800, 94 /* Index 730 - 739 */ 95 38200, 38600, 39000, 39400, 39800, 40200, 40600, 41000, 41400, 96 41800, 97 /* Index 740 - 749 */ 98 42200, 42600, 43100, 43700, 44200, 44600, 45000, 45400, 45800, 99 46200, 100 /* Index 750 - 759 */ 101 46600, 47000, 47400, 47800, 48200, 48600, 49000, 49400, 49800, 102 50200, 103 /* Index 760 - 769 */ 104 50600, 51000, 51400, 51800, 52200, 52600, 53000, 53400, 53800, 105 54200, 106 /* Index 770 - 779 */ 107 54600, 55000, 55400, 55900, 56500, 57000, 57400, 57800, 58200, 108 58600, 109 /* Index 780 - 789 */ 110 59000, 59400, 59800, 60200, 60600, 61000, 61400, 61800, 62200, 111 62600, 112 /* Index 790 - 799 */ 113 63000, 63400, 63800, 64200, 64600, 65000, 65400, 65800, 66200, 114 66600, 115 /* Index 800 - 809 */ 116 67000, 67400, 67800, 68200, 68600, 69000, 69400, 69800, 70200, 117 70600, 118 /* Index 810 - 819 */ 119 71000, 71500, 72100, 72600, 73000, 73400, 73800, 74200, 74600, 120 75000, 121 /* Index 820 - 829 */ 122 75400, 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, 123 79000, 124 /* Index 830 - 839 */ 125 79400, 79800, 80200, 80600, 81000, 81400, 81800, 82200, 82600, 126 83000, 127 /* Index 840 - 849 */ 128 83400, 83800, 84200, 84600, 85000, 85400, 85800, 86200, 86600, 129 87000, 130 /* Index 850 - 859 */ 131 87400, 87800, 88200, 88600, 89000, 89400, 89800, 90200, 90600, 132 91000, 133 /* Index 860 - 869 */ 134 91400, 91800, 92200, 92600, 93000, 93400, 93800, 94200, 94600, 135 95000, 136 /* Index 870 - 879 */ 137 95400, 95800, 96200, 96600, 97000, 97500, 98100, 98600, 99000, 138 99400, 139 /* Index 880 - 889 */ 140 99800, 100200, 100600, 101000, 101400, 101800, 102200, 102600, 103000, 141 103400, 142 /* Index 890 - 899 */ 143 103800, 104200, 104600, 105000, 105400, 105800, 106200, 106600, 107000, 144 107400, 145 /* Index 900 - 909 */ 146 107800, 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000, 147 111400, 148 /* Index 910 - 919 */ 149 111800, 112200, 112600, 113000, 113400, 113800, 114200, 114600, 115000, 150 115400, 151 /* Index 920 - 929 */ 152 115800, 116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, 153 119400, 154 /* Index 930 - 939 */ 155 119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000, 156 123400, 157 /* Index 940 - 945 */ 158 123800, 124200, 124600, 124900, 125000, 125000, 159 }; 160 161 static int ti_bandgap_get_temp(struct udevice *dev, int *temp) 162 { 163 struct ti_bandgap *bgp = dev_get_priv(dev); 164 165 bgp->temperature = 0x3ff & readl(bgp->base + CTRL_CORE_TEMP_SENSOR_MPU); 166 *temp = dra752_adc_to_temp[bgp->temperature - DRA752_ADC_START_VALUE]; 167 168 return 0; 169 } 170 171 static struct dm_thermal_ops ti_thermal_ops = { 172 .get_temp = ti_bandgap_get_temp, 173 }; 174 175 static int ti_bandgap_probe(struct udevice *dev) 176 { 177 struct ti_bandgap *bgp = dev_get_priv(dev); 178 179 bgp->base = devfdt_get_addr_index(dev, 1); 180 181 return 0; 182 } 183 184 static const struct udevice_id of_ti_bandgap_match[] = { 185 { 186 .compatible = "ti,dra752-bandgap", 187 }, 188 {}, 189 }; 190 191 U_BOOT_DRIVER(ti_bandgap_thermal) = { 192 .name = "ti_bandgap_thermal", 193 .id = UCLASS_THERMAL, 194 .ops = &ti_thermal_ops, 195 .probe = ti_bandgap_probe, 196 .of_match = of_ti_bandgap_match, 197 .priv_auto_alloc_size = sizeof(struct ti_bandgap), 198 }; 199
