1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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"
32#include "thermal_hwmon.h"
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
71
72
73
74
75
76
77
78struct amlogic_thermal_soc_calib_data {
79 int A;
80 int B;
81 int m;
82 int n;
83};
84
85
86
87
88
89
90
91
92struct 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
98struct 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
110
111
112static 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
139static 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
159static 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
173static 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
182static 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
198static const struct thermal_zone_of_device_ops amlogic_thermal_ops = {
199 .get_temp = amlogic_thermal_get_temp,
200};
201
202static 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
209static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {
210 .A = 9411,
211 .B = 3159,
212 .m = 424,
213 .n = 324,
214};
215
216static 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
222static 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
228static 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 { }
238};
239MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);
240
241static 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);
257 if (IS_ERR(base)) {
258 dev_err(dev, "failed to get io address\n");
259 return PTR_ERR(base);
260 }
261
262 pdata->regmap = devm_regmap_init_mmio(dev, base,
263 pdata->data->regmap_config);
264 if (IS_ERR(pdata->regmap))
265 return PTR_ERR(pdata->regmap);
266
267 pdata->clk = devm_clk_get(dev, NULL);
268 if (IS_ERR(pdata->clk)) {
269 if (PTR_ERR(pdata->clk) != -EPROBE_DEFER)
270 dev_err(dev, "failed to get clock\n");
271 return PTR_ERR(pdata->clk);
272 }
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_zone_of_sensor_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 if (devm_thermal_add_hwmon_sysfs(pdata->tzd))
292 dev_warn(&pdev->dev, "Failed to add hwmon sysfs attributes\n");
293
294 ret = amlogic_thermal_initialize(pdata);
295 if (ret)
296 return ret;
297
298 ret = amlogic_thermal_enable(pdata);
299
300 return ret;
301}
302
303static int amlogic_thermal_remove(struct platform_device *pdev)
304{
305 struct amlogic_thermal *data = platform_get_drvdata(pdev);
306
307 return amlogic_thermal_disable(data);
308}
309
310static int __maybe_unused amlogic_thermal_suspend(struct device *dev)
311{
312 struct amlogic_thermal *data = dev_get_drvdata(dev);
313
314 return amlogic_thermal_disable(data);
315}
316
317static int __maybe_unused amlogic_thermal_resume(struct device *dev)
318{
319 struct amlogic_thermal *data = dev_get_drvdata(dev);
320
321 return amlogic_thermal_enable(data);
322}
323
324static SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,
325 amlogic_thermal_suspend, amlogic_thermal_resume);
326
327static struct platform_driver amlogic_thermal_driver = {
328 .driver = {
329 .name = "amlogic_thermal",
330 .pm = &amlogic_thermal_pm_ops,
331 .of_match_table = of_amlogic_thermal_match,
332 },
333 .probe = amlogic_thermal_probe,
334 .remove = amlogic_thermal_remove,
335};
336
337module_platform_driver(amlogic_thermal_driver);
338
339MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
340MODULE_DESCRIPTION("Amlogic thermal driver");
341MODULE_LICENSE("GPL v2");
342
