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186bf549 LJ |
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 */ | |
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 | ||
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 | ||
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 */ | |
541d529f | 107 | static const struct st_thermal_compat_data st_415sas_cdata = { |
186bf549 LJ |
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 */ | |
541d529f | 117 | static const struct st_thermal_compat_data st_415mpe_cdata = { |
186bf549 LJ |
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 */ | |
541d529f | 127 | static const struct st_thermal_compat_data st_416sas_cdata = { |
186bf549 LJ |
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 */ | |
541d529f | 137 | static const struct st_thermal_compat_data st_127_cdata = { |
186bf549 LJ |
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 | ||
d877a62b | 146 | static const struct of_device_id st_syscfg_thermal_of_match[] = { |
186bf549 LJ |
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 | ||
541d529f | 155 | static int st_syscfg_probe(struct platform_device *pdev) |
186bf549 LJ |
156 | { |
157 | return st_thermal_register(pdev, st_syscfg_thermal_of_match); | |
158 | } | |
159 | ||
541d529f | 160 | static int st_syscfg_remove(struct platform_device *pdev) |
186bf549 LJ |
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", | |
186bf549 LJ |
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"); |