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13#include <linux/of.h>
14#include <linux/module.h>
15
16#include "st_thermal.h"
17
18#define STIH416_MPE_CONF 0x0
19#define STIH416_MPE_STATUS 0x4
20#define STIH416_MPE_INT_THRESH 0x8
21#define STIH416_MPE_INT_EN 0xC
22
23
24#define THERMAL_PDN BIT(4)
25#define THERMAL_SRSTN BIT(10)
26
27static const struct reg_field st_mmap_thermal_regfields[MAX_REGFIELDS] = {
28
29
30
31
32
33
34 [INT_THRESH_HI] = REG_FIELD(STIH416_MPE_INT_THRESH, 0, 7),
35 [DCORRECT] = REG_FIELD(STIH416_MPE_CONF, 5, 9),
36 [OVERFLOW] = REG_FIELD(STIH416_MPE_STATUS, 9, 9),
37 [DATA] = REG_FIELD(STIH416_MPE_STATUS, 11, 18),
38 [INT_ENABLE] = REG_FIELD(STIH416_MPE_INT_EN, 0, 0),
39};
40
41static irqreturn_t st_mmap_thermal_trip_handler(int irq, void *sdata)
42{
43 struct st_thermal_sensor *sensor = sdata;
44
45 thermal_zone_device_update(sensor->thermal_dev);
46
47 return IRQ_HANDLED;
48}
49
50
51static int st_mmap_power_ctrl(struct st_thermal_sensor *sensor,
52 enum st_thermal_power_state power_state)
53{
54 const unsigned int mask = (THERMAL_PDN | THERMAL_SRSTN);
55 const unsigned int val = power_state ? mask : 0;
56
57 return regmap_update_bits(sensor->regmap, STIH416_MPE_CONF, mask, val);
58}
59
60static int st_mmap_alloc_regfields(struct st_thermal_sensor *sensor)
61{
62 struct device *dev = sensor->dev;
63 struct regmap *regmap = sensor->regmap;
64 const struct reg_field *reg_fields = sensor->cdata->reg_fields;
65
66 sensor->int_thresh_hi = devm_regmap_field_alloc(dev, regmap,
67 reg_fields[INT_THRESH_HI]);
68 sensor->int_enable = devm_regmap_field_alloc(dev, regmap,
69 reg_fields[INT_ENABLE]);
70
71 if (IS_ERR(sensor->int_thresh_hi) || IS_ERR(sensor->int_enable)) {
72 dev_err(dev, "failed to alloc mmap regfields\n");
73 return -EINVAL;
74 }
75
76 return 0;
77}
78
79static int st_mmap_enable_irq(struct st_thermal_sensor *sensor)
80{
81 int ret;
82
83
84 ret = regmap_field_write(sensor->int_thresh_hi,
85 sensor->cdata->crit_temp -
86 sensor->cdata->temp_adjust_val);
87 if (ret)
88 return ret;
89
90 return regmap_field_write(sensor->int_enable, 1);
91}
92
93static int st_mmap_register_enable_irq(struct st_thermal_sensor *sensor)
94{
95 struct device *dev = sensor->dev;
96 struct platform_device *pdev = to_platform_device(dev);
97 int ret;
98
99 sensor->irq = platform_get_irq(pdev, 0);
100 if (sensor->irq < 0) {
101 dev_err(dev, "failed to register IRQ\n");
102 return sensor->irq;
103 }
104
105 ret = devm_request_threaded_irq(dev, sensor->irq,
106 NULL, st_mmap_thermal_trip_handler,
107 IRQF_TRIGGER_RISING | IRQF_ONESHOT,
108 dev->driver->name, sensor);
109 if (ret) {
110 dev_err(dev, "failed to register IRQ %d\n", sensor->irq);
111 return ret;
112 }
113
114 return st_mmap_enable_irq(sensor);
115}
116
117static const struct regmap_config st_416mpe_regmap_config = {
118 .reg_bits = 32,
119 .val_bits = 32,
120 .reg_stride = 4,
121};
122
123static int st_mmap_regmap_init(struct st_thermal_sensor *sensor)
124{
125 struct device *dev = sensor->dev;
126 struct platform_device *pdev = to_platform_device(dev);
127 struct resource *res;
128
129 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
130 if (!res) {
131 dev_err(dev, "no memory resources defined\n");
132 return -ENODEV;
133 }
134
135 sensor->mmio_base = devm_ioremap_resource(dev, res);
136 if (IS_ERR(sensor->mmio_base)) {
137 dev_err(dev, "failed to remap IO\n");
138 return PTR_ERR(sensor->mmio_base);
139 }
140
141 sensor->regmap = devm_regmap_init_mmio(dev, sensor->mmio_base,
142 &st_416mpe_regmap_config);
143 if (IS_ERR(sensor->regmap)) {
144 dev_err(dev, "failed to initialise regmap\n");
145 return PTR_ERR(sensor->regmap);
146 }
147
148 return 0;
149}
150
151static const struct st_thermal_sensor_ops st_mmap_sensor_ops = {
152 .power_ctrl = st_mmap_power_ctrl,
153 .alloc_regfields = st_mmap_alloc_regfields,
154 .regmap_init = st_mmap_regmap_init,
155 .register_enable_irq = st_mmap_register_enable_irq,
156 .enable_irq = st_mmap_enable_irq,
157};
158
159
160static const struct st_thermal_compat_data st_416mpe_cdata = {
161 .reg_fields = st_mmap_thermal_regfields,
162 .ops = &st_mmap_sensor_ops,
163 .calibration_val = 14,
164 .temp_adjust_val = -95,
165 .crit_temp = 120,
166};
167
168
169static const struct st_thermal_compat_data st_407_cdata = {
170 .reg_fields = st_mmap_thermal_regfields,
171 .ops = &st_mmap_sensor_ops,
172 .calibration_val = 16,
173 .temp_adjust_val = -95,
174 .crit_temp = 120,
175};
176
177static const struct of_device_id st_mmap_thermal_of_match[] = {
178 { .compatible = "st,stih416-mpe-thermal", .data = &st_416mpe_cdata },
179 { .compatible = "st,stih407-thermal", .data = &st_407_cdata },
180 { }
181};
182MODULE_DEVICE_TABLE(of, st_mmap_thermal_of_match);
183
184static int st_mmap_probe(struct platform_device *pdev)
185{
186 return st_thermal_register(pdev, st_mmap_thermal_of_match);
187}
188
189static int st_mmap_remove(struct platform_device *pdev)
190{
191 return st_thermal_unregister(pdev);
192}
193
194static struct platform_driver st_mmap_thermal_driver = {
195 .driver = {
196 .name = "st_thermal_mmap",
197 .pm = &st_thermal_pm_ops,
198 .of_match_table = st_mmap_thermal_of_match,
199 },
200 .probe = st_mmap_probe,
201 .remove = st_mmap_remove,
202};
203
204module_platform_driver(st_mmap_thermal_driver);
205
206MODULE_AUTHOR("STMicroelectronics (R&D) Limited <ajitpal.singh@st.com>");
207MODULE_DESCRIPTION("STMicroelectronics STi SoC Thermal Sensor Driver");
208MODULE_LICENSE("GPL v2");
209
