1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
// SPDX-License-Identifier: GPL-2.0
/*
* TI Bandgap temperature sensor driver for K3 SoC Family
*
* Copyright (C) 2020 Texas Instruments Incorporated - http://www.ti.com/
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/thermal.h>
#include <linux/types.h>
#include "thermal_hwmon.h"
#define K3_VTM_DEVINFO_PWR0_OFFSET 0x4
#define K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK 0xf0
#define K3_VTM_TMPSENS0_CTRL_OFFSET 0x80
#define K3_VTM_REGS_PER_TS 0x10
#define K3_VTM_TS_STAT_DTEMP_MASK 0x3ff
#define K3_VTM_TMPSENS_CTRL_CBIASSEL BIT(0)
#define K3_VTM_TMPSENS_CTRL_SOC BIT(5)
#define K3_VTM_TMPSENS_CTRL_CLRZ BIT(6)
#define K3_VTM_TMPSENS_CTRL_CLKON_REQ BIT(7)
#define K3_VTM_ADC_BEGIN_VAL 540
#define K3_VTM_ADC_END_VAL 944
static const int k3_adc_to_temp[] = {
-40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200,
-37800, -37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200,
-33800, -33400, -33000, -32600, -32200, -31800, -31400, -31000, -30600,
-30200, -29800, -29400, -29000, -28600, -28200, -27700, -27100, -26600,
-26200, -25800, -25400, -25000, -24600, -24200, -23800, -23400, -23000,
-22600, -22200, -21800, -21400, -21000, -20500, -19900, -19400, -19000,
-18600, -18200, -17800, -17400, -17000, -16600, -16200, -15800, -15400,
-15000, -14600, -14200, -13800, -13400, -13000, -12500, -11900, -11400,
-11000, -10600, -10200, -9800, -9400, -9000, -8600, -8200, -7800, -7400,
-7000, -6600, -6200, -5800, -5400, -5000, -4500, -3900, -3400, -3000,
-2600, -2200, -1800, -1400, -1000, -600, -200, 200, 600, 1000, 1400,
1800, 2200, 2600, 3000, 3400, 3900, 4500, 5000, 5400, 5800, 6200, 6600,
7000, 7400, 7800, 8200, 8600, 9000, 9400, 9800, 10200, 10600, 11000,
11400, 11800, 12200, 12700, 13300, 13800, 14200, 14600, 15000, 15400,
15800, 16200, 16600, 17000, 17400, 17800, 18200, 18600, 19000, 19400,
19800, 20200, 20600, 21000, 21400, 21900, 22500, 23000, 23400, 23800,
24200, 24600, 25000, 25400, 25800, 26200, 26600, 27000, 27400, 27800,
28200, 28600, 29000, 29400, 29800, 30200, 30600, 31000, 31400, 31900,
32500, 33000, 33400, 33800, 34200, 34600, 35000, 35400, 35800, 36200,
36600, 37000, 37400, 37800, 38200, 38600, 39000, 39400, 39800, 40200,
40600, 41000, 41400, 41800, 42200, 42600, 43100, 43700, 44200, 44600,
45000, 45400, 45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600,
49000, 49400, 49800, 50200, 50600, 51000, 51400, 51800, 52200, 52600,
53000, 53400, 53800, 54200, 54600, 55000, 55400, 55900, 56500, 57000,
57400, 57800, 58200, 58600, 59000, 59400, 59800, 60200, 60600, 61000,
61400, 61800, 62200, 62600, 63000, 63400, 63800, 64200, 64600, 65000,
65400, 65800, 66200, 66600, 67000, 67400, 67800, 68200, 68600, 69000,
69400, 69800, 70200, 70600, 71000, 71500, 72100, 72600, 73000, 73400,
73800, 74200, 74600, 75000, 75400, 75800, 76200, 76600, 77000, 77400,
77800, 78200, 78600, 79000, 79400, 79800, 80200, 80600, 81000, 81400,
81800, 82200, 82600, 83000, 83400, 83800, 84200, 84600, 85000, 85400,
85800, 86200, 86600, 87000, 87400, 87800, 88200, 88600, 89000, 89400,
89800, 90200, 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400,
93800, 94200, 94600, 95000, 95400, 95800, 96200, 96600, 97000, 97500,
98100, 98600, 99000, 99400, 99800, 100200, 100600, 101000, 101400,
101800, 102200, 102600, 103000, 103400, 103800, 104200, 104600, 105000,
105400, 105800, 106200, 106600, 107000, 107400, 107800, 108200, 108600,
109000, 109400, 109800, 110200, 110600, 111000, 111400, 111800, 112200,
112600, 113000, 113400, 113800, 114200, 114600, 115000, 115400, 115800,
116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, 119400,
119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000,
123400, 123800, 124200, 124600, 124900, 125000,
};
struct k3_bandgap {
void __iomem *base;
};
/* common data structures */
struct k3_thermal_data {
struct thermal_zone_device *tzd;
struct k3_bandgap *bgp;
int sensor_id;
u32 ctrl_offset;
u32 stat_offset;
};
static unsigned int vtm_get_best_value(unsigned int s0, unsigned int s1,
unsigned int s2)
{
int d01 = abs(s0 - s1);
int d02 = abs(s0 - s2);
int d12 = abs(s1 - s2);
if (d01 <= d02 && d01 <= d12)
return (s0 + s1) / 2;
if (d02 <= d01 && d02 <= d12)
return (s0 + s2) / 2;
return (s1 + s2) / 2;
}
static int k3_bgp_read_temp(struct k3_thermal_data *devdata,
int *temp)
{
struct k3_bandgap *bgp;
unsigned int dtemp, s0, s1, s2;
bgp = devdata->bgp;
/*
* Errata is applicable for am654 pg 1.0 silicon. There
* is a variation of the order for 8-10 degree centigrade.
* Work around that by getting the average of two closest
* readings out of three readings everytime we want to
* report temperatures.
*
* Errata workaround.
*/
s0 = readl(bgp->base + devdata->stat_offset) &
K3_VTM_TS_STAT_DTEMP_MASK;
s1 = readl(bgp->base + devdata->stat_offset) &
K3_VTM_TS_STAT_DTEMP_MASK;
s2 = readl(bgp->base + devdata->stat_offset) &
K3_VTM_TS_STAT_DTEMP_MASK;
dtemp = vtm_get_best_value(s0, s1, s2);
if (dtemp < K3_VTM_ADC_BEGIN_VAL || dtemp > K3_VTM_ADC_END_VAL)
return -EINVAL;
*temp = k3_adc_to_temp[dtemp - K3_VTM_ADC_BEGIN_VAL];
return 0;
}
static int k3_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
{
struct k3_thermal_data *data = thermal_zone_device_priv(tz);
int ret = 0;
ret = k3_bgp_read_temp(data, temp);
if (ret)
return ret;
return ret;
}
static const struct thermal_zone_device_ops k3_of_thermal_ops = {
.get_temp = k3_thermal_get_temp,
};
static const struct of_device_id of_k3_bandgap_match[];
static int k3_bandgap_probe(struct platform_device *pdev)
{
int ret = 0, cnt, val, id;
struct resource *res;
struct device *dev = &pdev->dev;
struct k3_bandgap *bgp;
struct k3_thermal_data *data;
if (ARRAY_SIZE(k3_adc_to_temp) != (K3_VTM_ADC_END_VAL + 1 -
K3_VTM_ADC_BEGIN_VAL))
return -EINVAL;
bgp = devm_kzalloc(&pdev->dev, sizeof(*bgp), GFP_KERNEL);
if (!bgp)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
bgp->base = devm_ioremap_resource(dev, res);
if (IS_ERR(bgp->base))
return PTR_ERR(bgp->base);
pm_runtime_enable(dev);
ret = pm_runtime_get_sync(dev);
if (ret < 0) {
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
return ret;
}
/* Get the sensor count in the VTM */
val = readl(bgp->base + K3_VTM_DEVINFO_PWR0_OFFSET);
cnt = val & K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK;
cnt >>= __ffs(K3_VTM_DEVINFO_PWR0_TEMPSENS_CT_MASK);
data = devm_kcalloc(dev, cnt, sizeof(*data), GFP_KERNEL);
if (!data) {
ret = -ENOMEM;
goto err_alloc;
}
/* Register the thermal sensors */
for (id = 0; id < cnt; id++) {
data[id].sensor_id = id;
data[id].bgp = bgp;
data[id].ctrl_offset = K3_VTM_TMPSENS0_CTRL_OFFSET +
id * K3_VTM_REGS_PER_TS;
data[id].stat_offset = data[id].ctrl_offset + 0x8;
val = readl(data[id].bgp->base + data[id].ctrl_offset);
val |= (K3_VTM_TMPSENS_CTRL_SOC |
K3_VTM_TMPSENS_CTRL_CLRZ |
K3_VTM_TMPSENS_CTRL_CLKON_REQ);
val &= ~K3_VTM_TMPSENS_CTRL_CBIASSEL;
writel(val, data[id].bgp->base + data[id].ctrl_offset);
data[id].tzd =
devm_thermal_of_zone_register(dev, id,
&data[id],
&k3_of_thermal_ops);
if (IS_ERR(data[id].tzd)) {
dev_err(dev, "thermal zone device is NULL\n");
ret = PTR_ERR(data[id].tzd);
goto err_alloc;
}
devm_thermal_add_hwmon_sysfs(dev, data[id].tzd);
}
return 0;
err_alloc:
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
return ret;
}
static void k3_bandgap_remove(struct platform_device *pdev)
{
pm_runtime_put_sync(&pdev->dev);
pm_runtime_disable(&pdev->dev);
}
static const struct of_device_id of_k3_bandgap_match[] = {
{
.compatible = "ti,am654-vtm",
},
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, of_k3_bandgap_match);
static struct platform_driver k3_bandgap_sensor_driver = {
.probe = k3_bandgap_probe,
.remove_new = k3_bandgap_remove,
.driver = {
.name = "k3-soc-thermal",
.of_match_table = of_k3_bandgap_match,
},
};
module_platform_driver(k3_bandgap_sensor_driver);
MODULE_DESCRIPTION("K3 bandgap temperature sensor driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("J Keerthy <j-keerthy@ti.com>");
|
