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 int 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	return 0;
177}
178
179static int amlogic_thermal_get_temp(struct thermal_zone_device *tz, int *temp)
180{
181	unsigned int tval;
182	struct amlogic_thermal *pdata = thermal_zone_device_priv(tz);
183
184	if (!pdata)
185		return -EINVAL;
186
187	regmap_read(pdata->regmap, TSENSOR_STAT0, &tval);
188	*temp =
189	   amlogic_thermal_code_to_millicelsius(pdata,
190						tval & TSENSOR_READ_TEMP_MASK);
191
192	return 0;
193}
194
195static const struct thermal_zone_device_ops amlogic_thermal_ops = {
196	.get_temp	= amlogic_thermal_get_temp,
197};
198
199static const struct regmap_config amlogic_thermal_regmap_config_g12a = {
200	.reg_bits = 8,
201	.val_bits = 32,
202	.reg_stride = 4,
203	.max_register = TSENSOR_STAT9,
204};
205
206static const struct amlogic_thermal_soc_calib_data amlogic_thermal_g12a = {
207	.A = 9411,
208	.B = 3159,
209	.m = 424,
210	.n = 324,
211};
212
213static const struct amlogic_thermal_data amlogic_thermal_g12a_cpu_param = {
214	.u_efuse_off = 0x128,
215	.calibration_parameters = &amlogic_thermal_g12a,
216	.regmap_config = &amlogic_thermal_regmap_config_g12a,
217};
218
219static const struct amlogic_thermal_data amlogic_thermal_g12a_ddr_param = {
220	.u_efuse_off = 0xf0,
221	.calibration_parameters = &amlogic_thermal_g12a,
222	.regmap_config = &amlogic_thermal_regmap_config_g12a,
223};
224
225static const struct of_device_id of_amlogic_thermal_match[] = {
226	{
227		.compatible = "amlogic,g12a-ddr-thermal",
228		.data = &amlogic_thermal_g12a_ddr_param,
229	},
230	{
231		.compatible = "amlogic,g12a-cpu-thermal",
232		.data = &amlogic_thermal_g12a_cpu_param,
233	},
234	{ /* sentinel */ }
235};
236MODULE_DEVICE_TABLE(of, of_amlogic_thermal_match);
237
238static int amlogic_thermal_probe(struct platform_device *pdev)
239{
240	struct amlogic_thermal *pdata;
241	struct device *dev = &pdev->dev;
242	void __iomem *base;
243	int ret;
244
245	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
246	if (!pdata)
247		return -ENOMEM;
248
249	pdata->data = of_device_get_match_data(dev);
250	pdata->pdev = pdev;
251	platform_set_drvdata(pdev, pdata);
252
253	base = devm_platform_ioremap_resource(pdev, 0);
254	if (IS_ERR(base))
255		return PTR_ERR(base);
256
257	pdata->regmap = devm_regmap_init_mmio(dev, base,
258					      pdata->data->regmap_config);
259	if (IS_ERR(pdata->regmap))
260		return PTR_ERR(pdata->regmap);
261
262	pdata->clk = devm_clk_get(dev, NULL);
263	if (IS_ERR(pdata->clk))
264		return dev_err_probe(dev, PTR_ERR(pdata->clk), "failed to get clock\n");
265
266	pdata->sec_ao_map = syscon_regmap_lookup_by_phandle
267		(pdev->dev.of_node, "amlogic,ao-secure");
268	if (IS_ERR(pdata->sec_ao_map)) {
269		dev_err(dev, "syscon regmap lookup failed.\n");
270		return PTR_ERR(pdata->sec_ao_map);
271	}
272
273	pdata->tzd = devm_thermal_of_zone_register(&pdev->dev,
274						   0,
275						   pdata,
276						   &amlogic_thermal_ops);
277	if (IS_ERR(pdata->tzd)) {
278		ret = PTR_ERR(pdata->tzd);
279		dev_err(dev, "Failed to register tsensor: %d\n", ret);
280		return ret;
281	}
282
283	devm_thermal_add_hwmon_sysfs(&pdev->dev, pdata->tzd);
284
285	ret = amlogic_thermal_initialize(pdata);
286	if (ret)
287		return ret;
288
289	ret = amlogic_thermal_enable(pdata);
290
291	return ret;
292}
293
294static int amlogic_thermal_remove(struct platform_device *pdev)
295{
296	struct amlogic_thermal *data = platform_get_drvdata(pdev);
297
298	return amlogic_thermal_disable(data);
299}
300
301static int __maybe_unused amlogic_thermal_suspend(struct device *dev)
302{
303	struct amlogic_thermal *data = dev_get_drvdata(dev);
304
305	return amlogic_thermal_disable(data);
306}
307
308static int __maybe_unused amlogic_thermal_resume(struct device *dev)
309{
310	struct amlogic_thermal *data = dev_get_drvdata(dev);
311
312	return amlogic_thermal_enable(data);
313}
314
315static SIMPLE_DEV_PM_OPS(amlogic_thermal_pm_ops,
316			 amlogic_thermal_suspend, amlogic_thermal_resume);
317
318static struct platform_driver amlogic_thermal_driver = {
319	.driver = {
320		.name		= "amlogic_thermal",
321		.pm		= &amlogic_thermal_pm_ops,
322		.of_match_table = of_amlogic_thermal_match,
323	},
324	.probe	= amlogic_thermal_probe,
325	.remove	= amlogic_thermal_remove,
326};
327
328module_platform_driver(amlogic_thermal_driver);
329
330MODULE_AUTHOR("Guillaume La Roque <glaroque@baylibre.com>");
331MODULE_DESCRIPTION("Amlogic thermal driver");
332MODULE_LICENSE("GPL v2");
333