tjh.dev
Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Amlogic Thermal Sensor Driver
4 *
5 * Copyright (C) 2017 Huan Biao <huan.biao@amlogic.com>
6 * Copyright (C) 2019 Guillaume La Roque <glaroque@baylibre.com>
7 *
8 * Register value to celsius temperature formulas:
9 * Read_Val m * U
10 * U = ---------, uptat = ---------
11 * 2^16 1 + n * U
12 *
13 * Temperature = A * ( uptat + u_efuse / 2^16 )- B
14 *
15 * A B m n : calibration parameters
16 * u_efuse : fused calibration value, it's a signed 16 bits value
17 */
18
19#include <linux/bitfield.h>
20#include <linux/clk.h>
21#include <linux/io.h>
22#include <linux/mfd/syscon.h>
23#include <linux/module.h>
24#include <linux/of.h>
25#include <linux/platform_device.h>
26#include <linux/regmap.h>
27#include <linux/thermal.h>
28
29#include "thermal_hwmon.h"
30
31#define TSENSOR_CFG_REG1 0x4
32 #define TSENSOR_CFG_REG1_RSET_VBG BIT(12)
33 #define TSENSOR_CFG_REG1_RSET_ADC BIT(11)
34 #define TSENSOR_CFG_REG1_VCM_EN BIT(10)
35 #define TSENSOR_CFG_REG1_VBG_EN BIT(9)
36 #define TSENSOR_CFG_REG1_OUT_CTL BIT(6)
37 #define TSENSOR_CFG_REG1_FILTER_EN BIT(5)
38 #define TSENSOR_CFG_REG1_DEM_EN BIT(3)
39 #define TSENSOR_CFG_REG1_CH_SEL GENMASK(1, 0)
40 #define TSENSOR_CFG_REG1_ENABLE \
41 (TSENSOR_CFG_REG1_FILTER_EN | \
42 TSENSOR_CFG_REG1_VCM_EN | \
43 TSENSOR_CFG_REG1_VBG_EN | \
44 TSENSOR_CFG_REG1_DEM_EN | \
45 TSENSOR_CFG_REG1_CH_SEL)
46
47#define TSENSOR_STAT0 0x40
48
49#define TSENSOR_STAT9 0x64
50
51#define TSENSOR_READ_TEMP_MASK GENMASK(15, 0)
52#define TSENSOR_TEMP_MASK GENMASK(11, 0)
53
54#define TSENSOR_TRIM_SIGN_MASK BIT(15)
55#define TSENSOR_TRIM_TEMP_MASK GENMASK(14, 0)
56#define TSENSOR_TRIM_VERSION_MASK GENMASK(31, 24)
57
58#define TSENSOR_TRIM_VERSION(_version) \
59 FIELD_GET(TSENSOR_TRIM_VERSION_MASK, _version)
60
61#define TSENSOR_TRIM_CALIB_VALID_MASK (GENMASK(3, 2) | BIT(7))
62
63#define TSENSOR_CALIB_OFFSET 1
64#define TSENSOR_CALIB_SHIFT 4
65
66/**
67 * struct amlogic_thermal_soc_calib_data
68 * @A: calibration parameters
69 * @B: calibration parameters
70 * @m: calibration parameters
71 * @n: calibration parameters
72 *
73 * This structure is required for configuration of amlogic thermal driver.
74 */
75struct amlogic_thermal_soc_calib_data {
76 int A;
77 int B;
78 int m;
79 int n;
80};
81
82/**
83 * struct amlogic_thermal_data
84 * @u_efuse_off: register offset to read fused calibration value
85 * @calibration_parameters: calibration parameters structure pointer
86 * @regmap_config: regmap config for the device
87 * This structure is required for configuration of amlogic thermal driver.
88 */
89struct amlogic_thermal_data {
90 int u_efuse_off;
91 const struct amlogic_thermal_soc_calib_data *calibration_parameters;
92 const struct regmap_config *regmap_config;
93};
94
95struct amlogic_thermal {
96 struct platform_device *pdev;
97 const struct amlogic_thermal_data *data;
98 struct regmap *regmap;
99 struct regmap *sec_ao_map;
100 struct clk *clk;
101 struct thermal_zone_device *tzd;
102 u32 trim_info;
103};
104
105/*
106 * Calculate a temperature value from a temperature code.
107 * The unit of the temperature is degree milliCelsius.
108 */
109static int amlogic_thermal_code_to_millicelsius(struct amlogic_thermal *pdata,
110 int temp_code)
111{
112 const struct amlogic_thermal_soc_calib_data *param =
113 pdata->data->calibration_parameters;
114 int temp;
115 s64 factor, uptat, uefuse;
116
117 uefuse = pdata->trim_info & TSENSOR_TRIM_SIGN_MASK ?
118 ~(pdata->trim_info & TSENSOR_TRIM_TEMP_MASK) + 1 :
119 (pdata->trim_info & TSENSOR_TRIM_TEMP_MASK);
120
121 factor = param->n * temp_code;
122 factor = div_s64(factor, 100);
123
124 uptat = temp_code * param->m;
125 uptat = div_s64(uptat, 100);
126 uptat = uptat * BIT(16);
127 uptat = div_s64(uptat, BIT(16) + factor);
128
129 temp = (uptat + uefuse) * param->A;
130 temp = div_s64(temp, BIT(16));
131 temp = (temp - param->B) * 100;
132
133 return temp;
134}
135
136static int amlogic_thermal_initialize(struct amlogic_thermal *pdata)
137{
138 int ret = 0;
139 int ver;
140
141 regmap_read(pdata->sec_ao_map, pdata->data->u_efuse_off,
142 &pdata->trim_info);
143
144 ver = TSENSOR_TRIM_VERSION(pdata->trim_info);
145
146 if ((ver & TSENSOR_TRIM_CALIB_VALID_MASK) == 0) {
147 ret = -EINVAL;
148 dev_err(&pdata->pdev->dev,
149 "tsensor thermal calibration not supported: 0x%x!\n",
150 ver);
151 }
152
153 return ret;
154}
155
156static int amlogic_thermal_enable(struct amlogic_thermal *data)
157{
158 int ret;
159
160 ret = clk_prepare_enable(data->clk);
161 if (ret)
162 return ret;
163
164 regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
165 TSENSOR_CFG_REG1_ENABLE, TSENSOR_CFG_REG1_ENABLE);
166
167 return 0;
168}
169
170static void amlogic_thermal_disable(struct amlogic_thermal *data)
171{
172 regmap_update_bits(data->regmap, TSENSOR_CFG_REG1,
173 TSENSOR_CFG_REG1_ENABLE, 0);
174 clk_disable_unprepare(data->clk);
175}
176
177static int amlogic_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
178{
179 unsigned int tval;
180 struct amlogic_thermal *pdata = thermal_zone_device_priv(tz);
181
182 if (!pdata)
183 return -EINVAL;
184
185 regmap_read(pdata->regmap, TSENSOR_STAT0, &tval);
186 *temp =
187 amlogic_thermal_code_to_millicelsius(pdata,
188 tval & TSENSOR_READ_TEMP_MASK);
189
190 return 0;
191}
192
193static const struct thermal_zone_device_ops amlogic_thermal_ops = {
194 .get_temp = amlogic_thermal_get_temp,
195};
196
197static const struct regmap_config amlogic_thermal_regmap_config_g12a = {
198 .reg_bits = 8,
199 .val_bits = 32,
200 .reg_stride = 4,
201 .max_register = TSENSOR_STAT9,
202};
203
204static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {
205 .A = 9411,
206 .B = 3159,
207 .m = 424,
208 .n = 324,
209};
210
211static const struct amlogic_thermal_data amlogic_thermal_g12a_cpu_param = {
212 .u_efuse_off = 0x128,
213 .calibration_parameters = &amlogic_thermal_g12a,
214 .regmap_config = &amlogic_thermal_regmap_config_g12a,
215};
216
217static const struct amlogic_thermal_data amlogic_thermal_g12a_ddr_param = {
218 .u_efuse_off = 0xf0,
219 .calibration_parameters = &amlogic_thermal_g12a,
220 .regmap_config = &amlogic_thermal_regmap_config_g12a,
221};
222
223static const struct amlogic_thermal_data amlogic_thermal_a1_cpu_param = {
224 .u_efuse_off = 0x114,
225 .calibration_parameters = &amlogic_thermal_g12a,
226 .regmap_config = &amlogic_thermal_regmap_config_g12a,
227};
228
229static const struct of_device_id of_amlogic_thermal_match[] = {
230 {
231 .compatible = "amlogic,g12a-ddr-thermal",
232 .data = &amlogic_thermal_g12a_ddr_param,
233 },
234 {
235 .compatible = "amlogic,g12a-cpu-thermal",
236 .data = &amlogic_thermal_g12a_cpu_param,
237 },
238 {
239 .compatible = "amlogic,a1-cpu-thermal",
240 .data = &amlogic_thermal_a1_cpu_param,
241 },
242 { /* sentinel */ }
243};
244MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);
245
246static int amlogic_thermal_probe(struct platform_device *pdev)
247{
248 struct amlogic_thermal *pdata;
249 struct device *dev = &pdev->dev;
250 void __iomem *base;
251 int ret;
252
253 pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
254 if (!pdata)
255 return -ENOMEM;
256
257 pdata->data = of_device_get_match_data(dev);
258 pdata->pdev = pdev;
259 platform_set_drvdata(pdev, pdata);
260
261 base = devm_platform_ioremap_resource(pdev, 0);
262 if (IS_ERR(base))
263 return PTR_ERR(base);
264
265 pdata->regmap = devm_regmap_init_mmio(dev, base,
266 pdata->data->regmap_config);
267 if (IS_ERR(pdata->regmap))
268 return PTR_ERR(pdata->regmap);
269
270 pdata->clk = devm_clk_get(dev, NULL);
271 if (IS_ERR(pdata->clk))
272 return dev_err_probe(dev, PTR_ERR(pdata->clk), "failed to get clock\n");
273
274 pdata->sec_ao_map = syscon_regmap_lookup_by_phandle
275 (pdev->dev.of_node, "amlogic,ao-secure");
276 if (IS_ERR(pdata->sec_ao_map)) {
277 dev_err(dev, "syscon regmap lookup failed.\n");
278 return PTR_ERR(pdata->sec_ao_map);
279 }
280
281 pdata->tzd = devm_thermal_of_zone_register(&pdev->dev,
282 0,
283 pdata,
284 &amlogic_thermal_ops);
285 if (IS_ERR(pdata->tzd)) {
286 ret = PTR_ERR(pdata->tzd);
287 dev_err(dev, "Failed to register tsensor: %d\n", ret);
288 return ret;
289 }
290
291 devm_thermal_add_hwmon_sysfs(&pdev->dev, pdata->tzd);
292
293 ret = amlogic_thermal_initialize(pdata);
294 if (ret)
295 return ret;
296
297 ret = amlogic_thermal_enable(pdata);
298
299 return ret;
300}
301
302static void amlogic_thermal_remove(struct platform_device *pdev)
303{
304 struct amlogic_thermal *data = platform_get_drvdata(pdev);
305
306 amlogic_thermal_disable(data);
307}
308
309static int amlogic_thermal_suspend(struct device *dev)
310{
311 struct amlogic_thermal *data = dev_get_drvdata(dev);
312
313 amlogic_thermal_disable(data);
314
315 return 0;
316}
317
318static int amlogic_thermal_resume(struct device *dev)
319{
320 struct amlogic_thermal *data = dev_get_drvdata(dev);
321
322 return amlogic_thermal_enable(data);
323}
324
325static DEFINE_SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,
326 amlogic_thermal_suspend,
327 amlogic_thermal_resume);
328
329static struct platform_driver amlogic_thermal_driver = {
330 .driver = {
331 .name = "amlogic_thermal",
332 .pm = pm_ptr(&amlogic_thermal_pm_ops),
333 .of_match_table = of_amlogic_thermal_match,
334 },
335 .probe = amlogic_thermal_probe,
336 .remove = amlogic_thermal_remove,
337};
338
339module_platform_driver(amlogic_thermal_driver);
340
341MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
342MODULE_DESCRIPTION("Amlogic thermal driver");
343MODULE_LICENSE("GPL v2");