1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * ST Thermal Sensor Driver for memory mapped 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
12 #include "st_thermal.h"
13
14 #define STIH416_MPE_CONF 0x0
15 #define STIH416_MPE_STATUS 0x4
16 #define STIH416_MPE_INT_THRESH 0x8
17 #define STIH416_MPE_INT_EN 0xC
18
19 /* Power control bits for the memory mapped thermal sensor */
20 #define THERMAL_PDN BIT(4)
21 #define THERMAL_SRSTN BIT(10)
22
23 static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = {
24 /*
25 * According to the STIH416 MPE temp sensor data sheet -
26 * the PDN (Power Down Bit) and SRSTN (Soft Reset Bit) need to be
27 * written simultaneously for powering on and off the temperature
28 * sensor. regmap_update_bits() will be used to update the register.
29 */
30 [INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7),
31 [DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9),
32 [OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9),
33 [DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18),
34 [INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0),
35 };
36
st_mmap_thermal_trip_handler(int irq,void * sdata)37 static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata)
38 {
39 struct st_thermal_sensor *sensor = sdata;
40
41 thermal_zone_device_update(sensor->thermal_dev,
42 THERMAL_EVENT_UNSPECIFIED);
43
44 return IRQ_HANDLED;
45 }
46
47 /* Private ops for the Memory Mapped based thermal sensors */
st_mmap_power_ctrl(struct st_thermal_sensor * sensor,enum st_thermal_power_state power_state)48 static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor,
49 enum st_thermal_power_state power_state)
50 {
51 const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN);
52 const unsigned int val = power_state ? mask : 0;
53
54 return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val);
55 }
56
st_mmap_alloc_regfields(struct st_thermal_sensor * sensor)57 static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor)
58 {
59 struct device *dev = sensor->dev;
60 struct regmap *regmap = sensor->regmap;
61 const struct reg_field *reg_fields = sensor->cdata->reg_fields;
62
63 sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap,
64 reg_fields[INT_THRESH_HI]);
65 sensor->int_enable = devm_regmap_field_alloc(dev, regmap,
66 reg_fields[INT_ENABLE]);
67
68 if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) {
69 dev_err(dev, "failed to alloc mmap regfields\n");
70 return -EINVAL;
71 }
72
73 return 0;
74 }
75
st_mmap_enable_irq(struct st_thermal_sensor * sensor)76 static int st_mmap_enable_irq(struct st_thermal_sensor *sensor)
77 {
78 int ret;
79
80 /* Set upper critical threshold */
81 ret = regmap_field_write(sensor->int_thresh_hi,
82 sensor->cdata->crit_temp -
83 sensor->cdata->temp_adjust_val);
84 if (ret)
85 return ret;
86
87 return regmap_field_write(sensor->int_enable, 1);
88 }
89
st_mmap_register_enable_irq(struct st_thermal_sensor * sensor)90 static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor)
91 {
92 struct device *dev = sensor->dev;
93 struct platform_device *pdev = to_platform_device(dev);
94 int ret;
95
96 sensor->irq = platform_get_irq(pdev, 0);
97 if (sensor->irq < 0)
98 return sensor->irq;
99
100 ret = devm_request_threaded_irq(dev, sensor->irq,
101 NULL, st_mmap_thermal_trip_handler,
102 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
103 dev->driver->name, sensor);
104 if (ret) {
105 dev_err(dev, "failed to register IRQ %d\n", sensor->irq);
106 return ret;
107 }
108
109 return st_mmap_enable_irq(sensor);
110 }
111
112 static const struct regmap_config st_416mpe_regmap_config = {
113 .reg_bits = 32,
114 .val_bits = 32,
115 .reg_stride = 4,
116 };
117
st_mmap_regmap_init(struct st_thermal_sensor * sensor)118 static int st_mmap_regmap_init(struct st_thermal_sensor *sensor)
119 {
120 struct device *dev = sensor->dev;
121 struct platform_device *pdev = to_platform_device(dev);
122
123 sensor->mmio_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
124 if (IS_ERR(sensor->mmio_base))
125 return PTR_ERR(sensor->mmio_base);
126
127 sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base,
128 &st_416mpe_regmap_config);
129 if (IS_ERR(sensor->regmap)) {
130 dev_err(dev, "failed to initialise regmap\n");
131 return PTR_ERR(sensor->regmap);
132 }
133
134 return 0;
135 }
136
137 static const struct st_thermal_sensor_ops st_mmap_sensor_ops = {
138 .power_ctrl = st_mmap_power_ctrl,
139 .alloc_regfields = st_mmap_alloc_regfields,
140 .regmap_init = st_mmap_regmap_init,
141 .register_enable_irq = st_mmap_register_enable_irq,
142 .enable_irq = st_mmap_enable_irq,
143 };
144
145 /* Compatible device data stih416 mpe thermal sensor */
146 static const struct st_thermal_compat_data st_416mpe_cdata = {
147 .reg_fields = st_mmap_thermal_regfields,
148 .ops = &st_mmap_sensor_ops,
149 .calibration_val = 14,
150 .temp_adjust_val = -95,
151 .crit_temp = 120,
152 };
153
154 /* Compatible device data stih407 thermal sensor */
155 static const struct st_thermal_compat_data st_407_cdata = {
156 .reg_fields = st_mmap_thermal_regfields,
157 .ops = &st_mmap_sensor_ops,
158 .calibration_val = 16,
159 .temp_adjust_val = -95,
160 .crit_temp = 120,
161 };
162
163 static const struct of_device_id st_mmap_thermal_of_match[] = {
164 { .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata },
165 { .compatible = "st,stih407-thermal", .data = &st_407_cdata },
166 { /* sentinel */ }
167 };
168 MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match);
169
st_mmap_probe(struct platform_device * pdev)170 static int st_mmap_probe(struct platform_device *pdev)
171 {
172 return st_thermal_register(pdev, st_mmap_thermal_of_match);
173 }
174
st_mmap_remove(struct platform_device * pdev)175 static void st_mmap_remove(struct platform_device *pdev)
176 {
177 st_thermal_unregister(pdev);
178 }
179
180 static struct platform_driver st_mmap_thermal_driver = {
181 .driver = {
182 .name = "st_thermal_mmap",
183 .pm = &st_thermal_pm_ops,
184 .of_match_table = st_mmap_thermal_of_match,
185 },
186 .probe = st_mmap_probe,
187 .remove_new = st_mmap_remove,
188 };
189
190 module_platform_driver(st_mmap_thermal_driver);
191
192 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
193 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
194 MODULE_LICENSE("GPL v2");
195