1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * ST Thermal Sensor Driver for syscfg based sensors.
4 * Author: Ajit Pal Singh <ajitpal.singh@st.com>
5 *
6 * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
7 */
8
9#include <linux/of.h>
10#include <linux/module.h>
11#include <linux/mfd/syscon.h>
12
13#include "st_thermal.h"
14
15/* STiH415 */
16#define STIH415_SYSCFG_FRONT(num)		((num - 100) * 4)
17#define STIH415_SAS_THSENS_CONF			STIH415_SYSCFG_FRONT(178)
18#define STIH415_SAS_THSENS_STATUS		STIH415_SYSCFG_FRONT(198)
19#define STIH415_SYSCFG_MPE(num)			((num - 600) * 4)
20#define STIH415_MPE_THSENS_CONF			STIH415_SYSCFG_MPE(607)
21#define STIH415_MPE_THSENS_STATUS		STIH415_SYSCFG_MPE(667)
22
23/* STiH416 */
24#define STIH416_SYSCFG_FRONT(num)		((num - 1000) * 4)
25#define STIH416_SAS_THSENS_CONF			STIH416_SYSCFG_FRONT(1552)
26#define STIH416_SAS_THSENS_STATUS1		STIH416_SYSCFG_FRONT(1554)
27#define STIH416_SAS_THSENS_STATUS2		STIH416_SYSCFG_FRONT(1594)
28
29/* STiD127 */
30#define STID127_SYSCFG_CPU(num)			((num - 700) * 4)
31#define STID127_THSENS_CONF			STID127_SYSCFG_CPU(743)
32#define STID127_THSENS_STATUS			STID127_SYSCFG_CPU(767)
33
34static const struct reg_field st_415sas_regfields[MAX_REGFIELDS] = {
35	[TEMP_PWR] = REG_FIELD(STIH415_SAS_THSENS_CONF,   9,  9),
36	[DCORRECT] = REG_FIELD(STIH415_SAS_THSENS_CONF,   4,  8),
37	[OVERFLOW] = REG_FIELD(STIH415_SAS_THSENS_STATUS, 8,  8),
38	[DATA] 	   = REG_FIELD(STIH415_SAS_THSENS_STATUS, 10, 16),
39};
40
41static const struct reg_field st_415mpe_regfields[MAX_REGFIELDS] = {
42	[TEMP_PWR] = REG_FIELD(STIH415_MPE_THSENS_CONF,   8,  8),
43	[DCORRECT] = REG_FIELD(STIH415_MPE_THSENS_CONF,   3,  7),
44	[OVERFLOW] = REG_FIELD(STIH415_MPE_THSENS_STATUS, 9,  9),
45	[DATA]     = REG_FIELD(STIH415_MPE_THSENS_STATUS, 11, 18),
46};
47
48static const struct reg_field st_416sas_regfields[MAX_REGFIELDS] = {
49	[TEMP_PWR] = REG_FIELD(STIH416_SAS_THSENS_CONF,    9,  9),
50	[DCORRECT] = REG_FIELD(STIH416_SAS_THSENS_CONF,    4,  8),
51	[OVERFLOW] = REG_FIELD(STIH416_SAS_THSENS_STATUS1, 8,  8),
52	[DATA]     = REG_FIELD(STIH416_SAS_THSENS_STATUS2, 10, 16),
53};
54
55static const struct reg_field st_127_regfields[MAX_REGFIELDS] = {
56	[TEMP_PWR] = REG_FIELD(STID127_THSENS_CONF,   7,  7),
57	[DCORRECT] = REG_FIELD(STID127_THSENS_CONF,   2,  6),
58	[OVERFLOW] = REG_FIELD(STID127_THSENS_STATUS, 9,  9),
59	[DATA]     = REG_FIELD(STID127_THSENS_STATUS, 11, 18),
60};
61
62/* Private OPs for System Configuration Register based thermal sensors */
63static int st_syscfg_power_ctrl(struct st_thermal_sensor *sensor,
64				enum st_thermal_power_state power_state)
65{
66	return regmap_field_write(sensor->pwr, power_state);
67}
68
69static int st_syscfg_alloc_regfields(struct st_thermal_sensor *sensor)
70{
71	struct device *dev = sensor->dev;
72
73	sensor->pwr = devm_regmap_field_alloc(dev, sensor->regmap,
74					sensor->cdata->reg_fields[TEMP_PWR]);
75
76	if (IS_ERR(sensor->pwr)) {
77		dev_err(dev, "failed to alloc syscfg regfields\n");
78		return PTR_ERR(sensor->pwr);
79	}
80
81	return 0;
82}
83
84static int st_syscfg_regmap_init(struct st_thermal_sensor *sensor)
85{
86	sensor->regmap =
87		syscon_regmap_lookup_by_compatible(sensor->cdata->sys_compat);
88	if (IS_ERR(sensor->regmap)) {
89		dev_err(sensor->dev, "failed to find syscfg regmap\n");
90		return PTR_ERR(sensor->regmap);
91	}
92
93	return 0;
94}
95
96static const struct st_thermal_sensor_ops st_syscfg_sensor_ops = {
97	.power_ctrl		= st_syscfg_power_ctrl,
98	.alloc_regfields	= st_syscfg_alloc_regfields,
99	.regmap_init		= st_syscfg_regmap_init,
100};
101
102/* Compatible device data for stih415 sas thermal sensor */
103static const struct st_thermal_compat_data st_415sas_cdata = {
104	.sys_compat		= "st,stih415-front-syscfg",
105	.reg_fields		= st_415sas_regfields,
106	.ops			= &st_syscfg_sensor_ops,
107	.calibration_val	= 16,
108	.temp_adjust_val	= 20,
109	.crit_temp		= 120,
110};
111
112/* Compatible device data for stih415 mpe thermal sensor */
113static const struct st_thermal_compat_data st_415mpe_cdata = {
114	.sys_compat		= "st,stih415-system-syscfg",
115	.reg_fields		= st_415mpe_regfields,
116	.ops			= &st_syscfg_sensor_ops,
117	.calibration_val	= 16,
118	.temp_adjust_val	= -103,
119	.crit_temp		= 120,
120};
121
122/* Compatible device data for stih416 sas thermal sensor */
123static const struct st_thermal_compat_data st_416sas_cdata = {
124	.sys_compat		= "st,stih416-front-syscfg",
125	.reg_fields		= st_416sas_regfields,
126	.ops			= &st_syscfg_sensor_ops,
127	.calibration_val	= 16,
128	.temp_adjust_val	= 20,
129	.crit_temp		= 120,
130};
131
132/* Compatible device data for stid127 thermal sensor */
133static const struct st_thermal_compat_data st_127_cdata = {
134	.sys_compat		= "st,stid127-cpu-syscfg",
135	.reg_fields		= st_127_regfields,
136	.ops			= &st_syscfg_sensor_ops,
137	.calibration_val	= 8,
138	.temp_adjust_val	= -103,
139	.crit_temp		= 120,
140};
141
142static const struct of_device_id st_syscfg_thermal_of_match[] = {
143	{ .compatible = "st,stih415-sas-thermal", .data = &st_415sas_cdata },
144	{ .compatible = "st,stih415-mpe-thermal", .data = &st_415mpe_cdata },
145	{ .compatible = "st,stih416-sas-thermal", .data = &st_416sas_cdata },
146	{ .compatible = "st,stid127-thermal",     .data = &st_127_cdata },
147	{ /* sentinel */ }
148};
149MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match);
150
151static int st_syscfg_probe(struct platform_device *pdev)
152{
153	return st_thermal_register(pdev, st_syscfg_thermal_of_match);
154}
155
156static int st_syscfg_remove(struct platform_device *pdev)
157{
158	return st_thermal_unregister(pdev);
159}
160
161static struct platform_driver st_syscfg_thermal_driver = {
162	.driver = {
163		.name	= "st_syscfg_thermal",
164		.pm     = &st_thermal_pm_ops,
165		.of_match_table =  st_syscfg_thermal_of_match,
166	},
167	.probe		= st_syscfg_probe,
168	.remove		= st_syscfg_remove,
169};
170module_platform_driver(st_syscfg_thermal_driver);
171
172MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
173MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
174MODULE_LICENSE("GPL v2");
175