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421eda10 GLR |
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/of_address.h> | |
26 | #include <linux/of_device.h> | |
27 | #include <linux/platform_device.h> | |
28 | #include <linux/regmap.h> | |
29 | #include <linux/thermal.h> | |
30 | ||
31 | #include "thermal_core.h" | |
cb68a858 | 32 | #include "thermal_hwmon.h" |
421eda10 GLR |
33 | |
34 | #define TSENSOR_CFG_REG1 0x4 | |
35 | #define TSENSOR_CFG_REG1_RSET_VBG BIT(12) | |
36 | #define TSENSOR_CFG_REG1_RSET_ADC BIT(11) | |
37 | #define TSENSOR_CFG_REG1_VCM_EN BIT(10) | |
38 | #define TSENSOR_CFG_REG1_VBG_EN BIT(9) | |
39 | #define TSENSOR_CFG_REG1_OUT_CTL BIT(6) | |
40 | #define TSENSOR_CFG_REG1_FILTER_EN BIT(5) | |
41 | #define TSENSOR_CFG_REG1_DEM_EN BIT(3) | |
42 | #define TSENSOR_CFG_REG1_CH_SEL GENMASK(1, 0) | |
43 | #define TSENSOR_CFG_REG1_ENABLE \ | |
44 | (TSENSOR_CFG_REG1_FILTER_EN | \ | |
45 | TSENSOR_CFG_REG1_VCM_EN | \ | |
46 | TSENSOR_CFG_REG1_VBG_EN | \ | |
47 | TSENSOR_CFG_REG1_DEM_EN | \ | |
48 | TSENSOR_CFG_REG1_CH_SEL) | |
49 | ||
50 | #define TSENSOR_STAT0 0x40 | |
51 | ||
52 | #define TSENSOR_STAT9 0x64 | |
53 | ||
54 | #define TSENSOR_READ_TEMP_MASK GENMASK(15, 0) | |
55 | #define TSENSOR_TEMP_MASK GENMASK(11, 0) | |
56 | ||
57 | #define TSENSOR_TRIM_SIGN_MASK BIT(15) | |
58 | #define TSENSOR_TRIM_TEMP_MASK GENMASK(14, 0) | |
59 | #define TSENSOR_TRIM_VERSION_MASK GENMASK(31, 24) | |
60 | ||
61 | #define TSENSOR_TRIM_VERSION(_version) \ | |
62 | FIELD_GET(TSENSOR_TRIM_VERSION_MASK, _version) | |
63 | ||
64 | #define TSENSOR_TRIM_CALIB_VALID_MASK (GENMASK(3, 2) | BIT(7)) | |
65 | ||
66 | #define TSENSOR_CALIB_OFFSET 1 | |
67 | #define TSENSOR_CALIB_SHIFT 4 | |
68 | ||
69 | /** | |
70 | * struct amlogic_thermal_soc_calib_data | |
be7b848b AK |
71 | * @A: calibration parameters |
72 | * @B: calibration parameters | |
73 | * @m: calibration parameters | |
74 | * @n: calibration parameters | |
75 | * | |
421eda10 GLR |
76 | * This structure is required for configuration of amlogic thermal driver. |
77 | */ | |
78 | struct amlogic_thermal_soc_calib_data { | |
79 | int A; | |
80 | int B; | |
81 | int m; | |
82 | int n; | |
83 | }; | |
84 | ||
85 | /** | |
86 | * struct amlogic_thermal_data | |
87 | * @u_efuse_off: register offset to read fused calibration value | |
88 | * @calibration_parameters: calibration parameters structure pointer | |
89 | * @regmap_config: regmap config for the device | |
90 | * This structure is required for configuration of amlogic thermal driver. | |
91 | */ | |
92 | struct amlogic_thermal_data { | |
93 | int u_efuse_off; | |
94 | const struct amlogic_thermal_soc_calib_data *calibration_parameters; | |
95 | const struct regmap_config *regmap_config; | |
96 | }; | |
97 | ||
98 | struct amlogic_thermal { | |
99 | struct platform_device *pdev; | |
100 | const struct amlogic_thermal_data *data; | |
101 | struct regmap *regmap; | |
102 | struct regmap *sec_ao_map; | |
103 | struct clk *clk; | |
104 | struct thermal_zone_device *tzd; | |
105 | u32 trim_info; | |
106 | }; | |
107 | ||
108 | /* | |
109 | * Calculate a temperature value from a temperature code. | |
110 | * The unit of the temperature is degree milliCelsius. | |
111 | */ | |
112 | static int amlogic_thermal_code_to_millicelsius(struct amlogic_thermal *pdata, | |
113 | int temp_code) | |
114 | { | |
115 | const struct amlogic_thermal_soc_calib_data *param = | |
116 | pdata->data->calibration_parameters; | |
117 | int temp; | |
118 | s64 factor, Uptat, uefuse; | |
119 | ||
120 | uefuse = pdata->trim_info & TSENSOR_TRIM_SIGN_MASK ? | |
121 | ~(pdata->trim_info & TSENSOR_TRIM_TEMP_MASK) + 1 : | |
122 | (pdata->trim_info & TSENSOR_TRIM_TEMP_MASK); | |
123 | ||
124 | factor = param->n * temp_code; | |
125 | factor = div_s64(factor, 100); | |
126 | ||
127 | Uptat = temp_code * param->m; | |
128 | Uptat = div_s64(Uptat, 100); | |
129 | Uptat = Uptat * BIT(16); | |
130 | Uptat = div_s64(Uptat, BIT(16) + factor); | |
131 | ||
132 | temp = (Uptat + uefuse) * param->A; | |
133 | temp = div_s64(temp, BIT(16)); | |
134 | temp = (temp - param->B) * 100; | |
135 | ||
136 | return temp; | |
137 | } | |
138 | ||
139 | static int amlogic_thermal_initialize(struct amlogic_thermal *pdata) | |
140 | { | |
141 | int ret = 0; | |
142 | int ver; | |
143 | ||
144 | regmap_read(pdata->sec_ao_map, pdata->data->u_efuse_off, | |
145 | &pdata->trim_info); | |
146 | ||
147 | ver = TSENSOR_TRIM_VERSION(pdata->trim_info); | |
148 | ||
149 | if ((ver & TSENSOR_TRIM_CALIB_VALID_MASK) == 0) { | |
150 | ret = -EINVAL; | |
151 | dev_err(&pdata->pdev->dev, | |
152 | "tsensor thermal calibration not supported: 0x%x!\n", | |
153 | ver); | |
154 | } | |
155 | ||
156 | return ret; | |
157 | } | |
158 | ||
159 | static int amlogic_thermal_enable(struct amlogic_thermal *data) | |
160 | { | |
161 | int ret; | |
162 | ||
163 | ret = clk_prepare_enable(data->clk); | |
164 | if (ret) | |
165 | return ret; | |
166 | ||
167 | regmap_update_bits(data->regmap, TSENSOR_CFG_REG1, | |
168 | TSENSOR_CFG_REG1_ENABLE, TSENSOR_CFG_REG1_ENABLE); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int amlogic_thermal_disable(struct amlogic_thermal *data) | |
174 | { | |
175 | regmap_update_bits(data->regmap, TSENSOR_CFG_REG1, | |
176 | TSENSOR_CFG_REG1_ENABLE, 0); | |
177 | clk_disable_unprepare(data->clk); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static int amlogic_thermal_get_temp(void *data, int *temp) | |
183 | { | |
184 | unsigned int tval; | |
185 | struct amlogic_thermal *pdata = data; | |
186 | ||
187 | if (!data) | |
188 | return -EINVAL; | |
189 | ||
190 | regmap_read(pdata->regmap, TSENSOR_STAT0, &tval); | |
191 | *temp = | |
192 | amlogic_thermal_code_to_millicelsius(pdata, | |
193 | tval & TSENSOR_READ_TEMP_MASK); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static const struct thermal_zone_of_device_ops amlogic_thermal_ops = { | |
199 | .get_temp = amlogic_thermal_get_temp, | |
200 | }; | |
201 | ||
202 | static const struct regmap_config amlogic_thermal_regmap_config_g12a = { | |
203 | .reg_bits = 8, | |
204 | .val_bits = 32, | |
205 | .reg_stride = 4, | |
206 | .max_register = TSENSOR_STAT9, | |
207 | }; | |
208 | ||
209 | static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = { | |
210 | .A = 9411, | |
211 | .B = 3159, | |
212 | .m = 424, | |
213 | .n = 324, | |
214 | }; | |
215 | ||
216 | static const struct amlogic_thermal_data amlogic_thermal_g12a_cpu_param = { | |
217 | .u_efuse_off = 0x128, | |
218 | .calibration_parameters = &amlogic_thermal_g12a, | |
219 | .regmap_config = &amlogic_thermal_regmap_config_g12a, | |
220 | }; | |
221 | ||
222 | static const struct amlogic_thermal_data amlogic_thermal_g12a_ddr_param = { | |
223 | .u_efuse_off = 0xf0, | |
224 | .calibration_parameters = &amlogic_thermal_g12a, | |
225 | .regmap_config = &amlogic_thermal_regmap_config_g12a, | |
226 | }; | |
227 | ||
228 | static const struct of_device_id of_amlogic_thermal_match[] = { | |
229 | { | |
230 | .compatible = "amlogic,g12a-ddr-thermal", | |
231 | .data = &amlogic_thermal_g12a_ddr_param, | |
232 | }, | |
233 | { | |
234 | .compatible = "amlogic,g12a-cpu-thermal", | |
235 | .data = &amlogic_thermal_g12a_cpu_param, | |
236 | }, | |
237 | { /* sentinel */ } | |
238 | }; | |
239 | MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match); | |
240 | ||
241 | static int amlogic_thermal_probe(struct platform_device *pdev) | |
242 | { | |
243 | struct amlogic_thermal *pdata; | |
244 | struct device *dev = &pdev->dev; | |
245 | void __iomem *base; | |
246 | int ret; | |
247 | ||
248 | pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); | |
249 | if (!pdata) | |
250 | return -ENOMEM; | |
251 | ||
252 | pdata->data = of_device_get_match_data(dev); | |
253 | pdata->pdev = pdev; | |
254 | platform_set_drvdata(pdev, pdata); | |
255 | ||
256 | base = devm_platform_ioremap_resource(pdev, 0); | |
e042e95b | 257 | if (IS_ERR(base)) |
421eda10 | 258 | return PTR_ERR(base); |
421eda10 GLR |
259 | |
260 | pdata->regmap = devm_regmap_init_mmio(dev, base, | |
261 | pdata->data->regmap_config); | |
262 | if (IS_ERR(pdata->regmap)) | |
263 | return PTR_ERR(pdata->regmap); | |
264 | ||
265 | pdata->clk = devm_clk_get(dev, NULL); | |
266 | if (IS_ERR(pdata->clk)) { | |
267 | if (PTR_ERR(pdata->clk) != -EPROBE_DEFER) | |
268 | dev_err(dev, "failed to get clock\n"); | |
269 | return PTR_ERR(pdata->clk); | |
270 | } | |
271 | ||
272 | pdata->sec_ao_map = syscon_regmap_lookup_by_phandle | |
273 | (pdev->dev.of_node, "amlogic,ao-secure"); | |
274 | if (IS_ERR(pdata->sec_ao_map)) { | |
275 | dev_err(dev, "syscon regmap lookup failed.\n"); | |
276 | return PTR_ERR(pdata->sec_ao_map); | |
277 | } | |
278 | ||
279 | pdata->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, | |
280 | 0, | |
281 | pdata, | |
282 | &amlogic_thermal_ops); | |
283 | if (IS_ERR(pdata->tzd)) { | |
284 | ret = PTR_ERR(pdata->tzd); | |
285 | dev_err(dev, "Failed to register tsensor: %d\n", ret); | |
286 | return ret; | |
287 | } | |
288 | ||
cb68a858 MB |
289 | if (devm_thermal_add_hwmon_sysfs(pdata->tzd)) |
290 | dev_warn(&pdev->dev, "Failed to add hwmon sysfs attributes\n"); | |
291 | ||
421eda10 GLR |
292 | ret = amlogic_thermal_initialize(pdata); |
293 | if (ret) | |
294 | return ret; | |
295 | ||
296 | ret = amlogic_thermal_enable(pdata); | |
297 | ||
298 | return ret; | |
299 | } | |
300 | ||
301 | static int amlogic_thermal_remove(struct platform_device *pdev) | |
302 | { | |
303 | struct amlogic_thermal *data = platform_get_drvdata(pdev); | |
304 | ||
305 | return amlogic_thermal_disable(data); | |
306 | } | |
307 | ||
308 | static int __maybe_unused amlogic_thermal_suspend(struct device *dev) | |
309 | { | |
310 | struct amlogic_thermal *data = dev_get_drvdata(dev); | |
311 | ||
312 | return amlogic_thermal_disable(data); | |
313 | } | |
314 | ||
315 | static int __maybe_unused amlogic_thermal_resume(struct device *dev) | |
316 | { | |
317 | struct amlogic_thermal *data = dev_get_drvdata(dev); | |
318 | ||
319 | return amlogic_thermal_enable(data); | |
320 | } | |
321 | ||
322 | static SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops, | |
323 | amlogic_thermal_suspend, amlogic_thermal_resume); | |
324 | ||
325 | static struct platform_driver amlogic_thermal_driver = { | |
326 | .driver = { | |
327 | .name = "amlogic_thermal", | |
328 | .pm = &amlogic_thermal_pm_ops, | |
329 | .of_match_table = of_amlogic_thermal_match, | |
330 | }, | |
331 | .probe = amlogic_thermal_probe, | |
332 | .remove = amlogic_thermal_remove, | |
333 | }; | |
334 | ||
335 | module_platform_driver(amlogic_thermal_driver); | |
336 | ||
337 | MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>"); | |
338 | MODULE_DESCRIPTION("Amlogic thermal driver"); | |
339 | MODULE_LICENSE("GPL v2"); |