This source file includes following definitions.
- st_mmap_thermal_trip_handler
- st_mmap_power_ctrl
- st_mmap_alloc_regfields
- st_mmap_enable_irq
- st_mmap_register_enable_irq
- st_mmap_regmap_init
- st_mmap_probe
- st_mmap_remove
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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
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
26
27
28
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
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
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
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
76 static int st_mmap_enable_irq(struct st_thermal_sensor *sensor)
77 {
78 int ret;
79
80
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
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 dev_err(dev, "failed to register IRQ\n");
99 return sensor->irq;
100 }
101
102 ret = devm_request_threaded_irq(dev, sensor->irq,
103 NULL, st_mmap_thermal_trip_handler,
104 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
105 dev->driver->name, sensor);
106 if (ret) {
107 dev_err(dev, "failed to register IRQ %d\n", sensor->irq);
108 return ret;
109 }
110
111 return st_mmap_enable_irq(sensor);
112 }
113
114 static const struct regmap_config st_416mpe_regmap_config = {
115 .reg_bits = 32,
116 .val_bits = 32,
117 .reg_stride = 4,
118 };
119
120 static int st_mmap_regmap_init(struct st_thermal_sensor *sensor)
121 {
122 struct device *dev = sensor->dev;
123 struct platform_device *pdev = to_platform_device(dev);
124 struct resource *res;
125
126 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
127 if (!res) {
128 dev_err(dev, "no memory resources defined\n");
129 return -ENODEV;
130 }
131
132 sensor->mmio_base = devm_ioremap_resource(dev, res);
133 if (IS_ERR(sensor->mmio_base)) {
134 dev_err(dev, "failed to remap IO\n");
135 return PTR_ERR(sensor->mmio_base);
136 }
137
138 sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base,
139 &st_416mpe_regmap_config);
140 if (IS_ERR(sensor->regmap)) {
141 dev_err(dev, "failed to initialise regmap\n");
142 return PTR_ERR(sensor->regmap);
143 }
144
145 return 0;
146 }
147
148 static const struct st_thermal_sensor_ops st_mmap_sensor_ops = {
149 .power_ctrl = st_mmap_power_ctrl,
150 .alloc_regfields = st_mmap_alloc_regfields,
151 .regmap_init = st_mmap_regmap_init,
152 .register_enable_irq = st_mmap_register_enable_irq,
153 .enable_irq = st_mmap_enable_irq,
154 };
155
156
157 static const struct st_thermal_compat_data st_416mpe_cdata = {
158 .reg_fields = st_mmap_thermal_regfields,
159 .ops = &st_mmap_sensor_ops,
160 .calibration_val = 14,
161 .temp_adjust_val = -95,
162 .crit_temp = 120,
163 };
164
165
166 static const struct st_thermal_compat_data st_407_cdata = {
167 .reg_fields = st_mmap_thermal_regfields,
168 .ops = &st_mmap_sensor_ops,
169 .calibration_val = 16,
170 .temp_adjust_val = -95,
171 .crit_temp = 120,
172 };
173
174 static const struct of_device_id st_mmap_thermal_of_match[] = {
175 { .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata },
176 { .compatible = "st,stih407-thermal", .data = &st_407_cdata },
177 { }
178 };
179 MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match);
180
181 static int st_mmap_probe(struct platform_device *pdev)
182 {
183 return st_thermal_register(pdev, st_mmap_thermal_of_match);
184 }
185
186 static int st_mmap_remove(struct platform_device *pdev)
187 {
188 return st_thermal_unregister(pdev);
189 }
190
191 static struct platform_driver st_mmap_thermal_driver = {
192 .driver = {
193 .name = "st_thermal_mmap",
194 .pm = &st_thermal_pm_ops,
195 .of_match_table = st_mmap_thermal_of_match,
196 },
197 .probe = st_mmap_probe,
198 .remove = st_mmap_remove,
199 };
200
201 module_platform_driver(st_mmap_thermal_driver);
202
203 MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
204 MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
205 MODULE_LICENSE("GPL v2");