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 uint adc_val;
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
ti_bandgap_get_temp(struct udevice * dev,int * temp)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->adc_val = 0x3ff & readl(bgp->base + CTRL_CORE_TEMP_SENSOR_MPU);
166 *temp = dra752_adc_to_temp[bgp->adc_val - 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
ti_bandgap_probe(struct udevice * dev)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 = sizeof(struct ti_bandgap),
198 };
199