1 /*
2 * ST Thermal Sensor Driver for syscfg based sensors.
3 * Author: Ajit Pal Singh <ajitpal.singh@st.com>
4 *
5 * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12
13 #include <linux/of.h>
14 #include <linux/module.h>
15 #include <linux/mfd/syscon.h>
16
17 #include "st_thermal.h"
18
19 /* STiH415 */
20 #define STIH415_SYSCFG_FRONT(num) ((num - 100) * 4)
21 #define STIH415_SAS_THSENS_CONF STIH415_SYSCFG_FRONT(178)
22 #define STIH415_SAS_THSENS_STATUS STIH415_SYSCFG_FRONT(198)
23 #define STIH415_SYSCFG_MPE(num) ((num - 600) * 4)
24 #define STIH415_MPE_THSENS_CONF STIH415_SYSCFG_MPE(607)
25 #define STIH415_MPE_THSENS_STATUS STIH415_SYSCFG_MPE(667)
26
27 /* STiH416 */
28 #define STIH416_SYSCFG_FRONT(num) ((num - 1000) * 4)
29 #define STIH416_SAS_THSENS_CONF STIH416_SYSCFG_FRONT(1552)
30 #define STIH416_SAS_THSENS_STATUS1 STIH416_SYSCFG_FRONT(1554)
31 #define STIH416_SAS_THSENS_STATUS2 STIH416_SYSCFG_FRONT(1594)
32
33 /* STiD127 */
34 #define STID127_SYSCFG_CPU(num) ((num - 700) * 4)
35 #define STID127_THSENS_CONF STID127_SYSCFG_CPU(743)
36 #define STID127_THSENS_STATUS STID127_SYSCFG_CPU(767)
37
38 static const struct reg_field st_415sas_regfields[MAX_REGFIELDS] = {
39 [TEMP_PWR] = REG_FIELD(STIH415_SAS_THSENS_CONF, 9, 9),
40 [DCORRECT] = REG_FIELD(STIH415_SAS_THSENS_CONF, 4, 8),
41 [OVERFLOW] = REG_FIELD(STIH415_SAS_THSENS_STATUS, 8, 8),
42 [DATA] = REG_FIELD(STIH415_SAS_THSENS_STATUS, 10, 16),
43 };
44
45 static const struct reg_field st_415mpe_regfields[MAX_REGFIELDS] = {
46 [TEMP_PWR] = REG_FIELD(STIH415_MPE_THSENS_CONF, 8, 8),
47 [DCORRECT] = REG_FIELD(STIH415_MPE_THSENS_CONF, 3, 7),
48 [OVERFLOW] = REG_FIELD(STIH415_MPE_THSENS_STATUS, 9, 9),
49 [DATA] = REG_FIELD(STIH415_MPE_THSENS_STATUS, 11, 18),
50 };
51
52 static const struct reg_field st_416sas_regfields[MAX_REGFIELDS] = {
53 [TEMP_PWR] = REG_FIELD(STIH416_SAS_THSENS_CONF, 9, 9),
54 [DCORRECT] = REG_FIELD(STIH416_SAS_THSENS_CONF, 4, 8),
55 [OVERFLOW] = REG_FIELD(STIH416_SAS_THSENS_STATUS1, 8, 8),
56 [DATA] = REG_FIELD(STIH416_SAS_THSENS_STATUS2, 10, 16),
57 };
58
59 static const struct reg_field st_127_regfields[MAX_REGFIELDS] = {
60 [TEMP_PWR] = REG_FIELD(STID127_THSENS_CONF, 7, 7),
61 [DCORRECT] = REG_FIELD(STID127_THSENS_CONF, 2, 6),
62 [OVERFLOW] = REG_FIELD(STID127_THSENS_STATUS, 9, 9),
63 [DATA] = REG_FIELD(STID127_THSENS_STATUS, 11, 18),
64 };
65
66 /* Private OPs for System Configuration Register based thermal sensors */
st_syscfg_power_ctrl(struct st_thermal_sensor * sensor,enum st_thermal_power_state power_state)67 static int st_syscfg_power_ctrl(struct st_thermal_sensor *sensor,
68 enum st_thermal_power_state power_state)
69 {
70 return regmap_field_write(sensor->pwr, power_state);
71 }
72
st_syscfg_alloc_regfields(struct st_thermal_sensor * sensor)73 static int st_syscfg_alloc_regfields(struct st_thermal_sensor *sensor)
74 {
75 struct device *dev = sensor->dev;
76
77 sensor->pwr = devm_regmap_field_alloc(dev, sensor->regmap,
78 sensor->cdata->reg_fields[TEMP_PWR]);
79
80 if (IS_ERR(sensor->pwr)) {
81 dev_err(dev, "failed to alloc syscfg regfields\n");
82 return PTR_ERR(sensor->pwr);
83 }
84
85 return 0;
86 }
87
st_syscfg_regmap_init(struct st_thermal_sensor * sensor)88 static int st_syscfg_regmap_init(struct st_thermal_sensor *sensor)
89 {
90 sensor->regmap =
91 syscon_regmap_lookup_by_compatible(sensor->cdata->sys_compat);
92 if (IS_ERR(sensor->regmap)) {
93 dev_err(sensor->dev, "failed to find syscfg regmap\n");
94 return PTR_ERR(sensor->regmap);
95 }
96
97 return 0;
98 }
99
100 static const struct st_thermal_sensor_ops st_syscfg_sensor_ops = {
101 .power_ctrl = st_syscfg_power_ctrl,
102 .alloc_regfields = st_syscfg_alloc_regfields,
103 .regmap_init = st_syscfg_regmap_init,
104 };
105
106 /* Compatible device data for stih415 sas thermal sensor */
107 static const struct st_thermal_compat_data st_415sas_cdata = {
108 .sys_compat = "st,stih415-front-syscfg",
109 .reg_fields = st_415sas_regfields,
110 .ops = &st_syscfg_sensor_ops,
111 .calibration_val = 16,
112 .temp_adjust_val = 20,
113 .crit_temp = 120,
114 };
115
116 /* Compatible device data for stih415 mpe thermal sensor */
117 static const struct st_thermal_compat_data st_415mpe_cdata = {
118 .sys_compat = "st,stih415-system-syscfg",
119 .reg_fields = st_415mpe_regfields,
120 .ops = &st_syscfg_sensor_ops,
121 .calibration_val = 16,
122 .temp_adjust_val = -103,
123 .crit_temp = 120,
124 };
125
126 /* Compatible device data for stih416 sas thermal sensor */
127 static const struct st_thermal_compat_data st_416sas_cdata = {
128 .sys_compat = "st,stih416-front-syscfg",
129 .reg_fields = st_416sas_regfields,
130 .ops = &st_syscfg_sensor_ops,
131 .calibration_val = 16,
132 .temp_adjust_val = 20,
133 .crit_temp = 120,
134 };
135
136 /* Compatible device data for stid127 thermal sensor */
137 static const struct st_thermal_compat_data st_127_cdata = {
138 .sys_compat = "st,stid127-cpu-syscfg",
139 .reg_fields = st_127_regfields,
140 .ops = &st_syscfg_sensor_ops,
141 .calibration_val = 8,
142 .temp_adjust_val = -103,
143 .crit_temp = 120,
144 };
145
146 static const struct of_device_id st_syscfg_thermal_of_match[] = {
147 { .compatible = "st,stih415-sas-thermal", .data = &st_415sas_cdata },
148 { .compatible = "st,stih415-mpe-thermal", .data = &st_415mpe_cdata },
149 { .compatible = "st,stih416-sas-thermal", .data = &st_416sas_cdata },
150 { .compatible = "st,stid127-thermal", .data = &st_127_cdata },
151 { /* sentinel */ }
152 };
153 MODULE_DEVICE_TABLE(of, st_syscfg_thermal_of_match);
154
st_syscfg_probe(struct platform_device * pdev)155 static int st_syscfg_probe(struct platform_device *pdev)
156 {
157 return st_thermal_register(pdev, st_syscfg_thermal_of_match);
158 }
159
st_syscfg_remove(struct platform_device * pdev)160 static int st_syscfg_remove(struct platform_device *pdev)
161 {
162 return st_thermal_unregister(pdev);
163 }
164
165 static struct platform_driver st_syscfg_thermal_driver = {
166 .driver = {
167 .name = "st_syscfg_thermal",
168 .pm = &st_thermal_pm_ops,
169 .of_match_table = st_syscfg_thermal_of_match,
170 },
171 .probe = st_syscfg_probe,
172 .remove = st_syscfg_remove,
173 };
174 module_platform_driver(st_syscfg_thermal_driver);
175
176 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
177 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
178 MODULE_LICENSE("GPL v2");
179