1/*
2 * Intel Broxton PMIC thermal driver
3 *
4 * Copyright (C) 2016 Intel Corporation. All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License version
8 * 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 */
16
17#include <linux/module.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/delay.h>
21#include <linux/interrupt.h>
22#include <linux/device.h>
23#include <linux/thermal.h>
24#include <linux/platform_device.h>
25#include <linux/sched.h>
26#include <linux/mfd/intel_soc_pmic.h>
27
28#define BXTWC_THRM0IRQ 0x4E04
29#define BXTWC_THRM1IRQ 0x4E05
30#define BXTWC_THRM2IRQ 0x4E06
31#define BXTWC_MTHRM0IRQ 0x4E12
32#define BXTWC_MTHRM1IRQ 0x4E13
33#define BXTWC_MTHRM2IRQ 0x4E14
34#define BXTWC_STHRM0IRQ 0x4F19
35#define BXTWC_STHRM1IRQ 0x4F1A
36#define BXTWC_STHRM2IRQ 0x4F1B
37
38struct trip_config_map {
39 u16 irq_reg;
40 u16 irq_en;
41 u16 evt_stat;
42 u8 irq_mask;
43 u8 irq_en_mask;
44 u8 evt_mask;
45 u8 trip_num;
46};
47
48struct thermal_irq_map {
49 char handle[20];
50 int num_trips;
51 const struct trip_config_map *trip_config;
52};
53
54struct pmic_thermal_data {
55 const struct thermal_irq_map *maps;
56 int num_maps;
57};
58
59static const struct trip_config_map bxtwc_str0_trip_config[] = {
60 {
61 .irq_reg = BXTWC_THRM0IRQ,
62 .irq_mask = 0x01,
63 .irq_en = BXTWC_MTHRM0IRQ,
64 .irq_en_mask = 0x01,
65 .evt_stat = BXTWC_STHRM0IRQ,
66 .evt_mask = 0x01,
67 .trip_num = 0
68 },
69 {
70 .irq_reg = BXTWC_THRM0IRQ,
71 .irq_mask = 0x10,
72 .irq_en = BXTWC_MTHRM0IRQ,
73 .irq_en_mask = 0x10,
74 .evt_stat = BXTWC_STHRM0IRQ,
75 .evt_mask = 0x10,
76 .trip_num = 1
77 }
78};
79
80static const struct trip_config_map bxtwc_str1_trip_config[] = {
81 {
82 .irq_reg = BXTWC_THRM0IRQ,
83 .irq_mask = 0x02,
84 .irq_en = BXTWC_MTHRM0IRQ,
85 .irq_en_mask = 0x02,
86 .evt_stat = BXTWC_STHRM0IRQ,
87 .evt_mask = 0x02,
88 .trip_num = 0
89 },
90 {
91 .irq_reg = BXTWC_THRM0IRQ,
92 .irq_mask = 0x20,
93 .irq_en = BXTWC_MTHRM0IRQ,
94 .irq_en_mask = 0x20,
95 .evt_stat = BXTWC_STHRM0IRQ,
96 .evt_mask = 0x20,
97 .trip_num = 1
98 },
99};
100
101static const struct trip_config_map bxtwc_str2_trip_config[] = {
102 {
103 .irq_reg = BXTWC_THRM0IRQ,
104 .irq_mask = 0x04,
105 .irq_en = BXTWC_MTHRM0IRQ,
106 .irq_en_mask = 0x04,
107 .evt_stat = BXTWC_STHRM0IRQ,
108 .evt_mask = 0x04,
109 .trip_num = 0
110 },
111 {
112 .irq_reg = BXTWC_THRM0IRQ,
113 .irq_mask = 0x40,
114 .irq_en = BXTWC_MTHRM0IRQ,
115 .irq_en_mask = 0x40,
116 .evt_stat = BXTWC_STHRM0IRQ,
117 .evt_mask = 0x40,
118 .trip_num = 1
119 },
120};
121
122static const struct trip_config_map bxtwc_str3_trip_config[] = {
123 {
124 .irq_reg = BXTWC_THRM2IRQ,
125 .irq_mask = 0x10,
126 .irq_en = BXTWC_MTHRM2IRQ,
127 .irq_en_mask = 0x10,
128 .evt_stat = BXTWC_STHRM2IRQ,
129 .evt_mask = 0x10,
130 .trip_num = 0
131 },
132};
133
134static const struct thermal_irq_map bxtwc_thermal_irq_map[] = {
135 {
136 .handle = "STR0",
137 .trip_config = bxtwc_str0_trip_config,
138 .num_trips = ARRAY_SIZE(bxtwc_str0_trip_config),
139 },
140 {
141 .handle = "STR1",
142 .trip_config = bxtwc_str1_trip_config,
143 .num_trips = ARRAY_SIZE(bxtwc_str1_trip_config),
144 },
145 {
146 .handle = "STR2",
147 .trip_config = bxtwc_str2_trip_config,
148 .num_trips = ARRAY_SIZE(bxtwc_str2_trip_config),
149 },
150 {
151 .handle = "STR3",
152 .trip_config = bxtwc_str3_trip_config,
153 .num_trips = ARRAY_SIZE(bxtwc_str3_trip_config),
154 },
155};
156
157static const struct pmic_thermal_data bxtwc_thermal_data = {
158 .maps = bxtwc_thermal_irq_map,
159 .num_maps = ARRAY_SIZE(bxtwc_thermal_irq_map),
160};
161
162static irqreturn_t pmic_thermal_irq_handler(int irq, void *data)
163{
164 struct platform_device *pdev = data;
165 struct thermal_zone_device *tzd;
166 struct pmic_thermal_data *td;
167 struct intel_soc_pmic *pmic;
168 struct regmap *regmap;
169 u8 reg_val, mask, irq_stat;
170 u16 reg, evt_stat_reg;
171 int i, j, ret;
172
173 pmic = dev_get_drvdata(pdev->dev.parent);
174 regmap = pmic->regmap;
175 td = (struct pmic_thermal_data *)
176 platform_get_device_id(pdev)->driver_data;
177
178 /* Resolve thermal irqs */
179 for (i = 0; i < td->num_maps; i++) {
180 for (j = 0; j < td->maps[i].num_trips; j++) {
181 reg = td->maps[i].trip_config[j].irq_reg;
182 mask = td->maps[i].trip_config[j].irq_mask;
183 /*
184 * Read the irq register to resolve whether the
185 * interrupt was triggered for this sensor
186 */
187 if (regmap_read(regmap, reg, &ret))
188 return IRQ_HANDLED;
189
190 reg_val = (u8)ret;
191 irq_stat = ((u8)ret & mask);
192
193 if (!irq_stat)
194 continue;
195
196 /*
197 * Read the status register to find out what
198 * event occurred i.e a high or a low
199 */
200 evt_stat_reg = td->maps[i].trip_config[j].evt_stat;
201 if (regmap_read(regmap, evt_stat_reg, &ret))
202 return IRQ_HANDLED;
203
204 tzd = thermal_zone_get_zone_by_name(td->maps[i].handle);
205 if (!IS_ERR(tzd))
206 thermal_zone_device_update(tzd,
207 THERMAL_EVENT_UNSPECIFIED);
208
209 /* Clear the appropriate irq */
210 regmap_write(regmap, reg, reg_val & mask);
211 }
212 }
213
214 return IRQ_HANDLED;
215}
216
217static int pmic_thermal_probe(struct platform_device *pdev)
218{
219 struct regmap_irq_chip_data *regmap_irq_chip;
220 struct pmic_thermal_data *thermal_data;
221 int ret, irq, virq, i, j, pmic_irq_count;
222 struct intel_soc_pmic *pmic;
223 struct regmap *regmap;
224 struct device *dev;
225 u16 reg;
226 u8 mask;
227
228 dev = &pdev->dev;
229 pmic = dev_get_drvdata(pdev->dev.parent);
230 if (!pmic) {
231 dev_err(dev, "Failed to get struct intel_soc_pmic pointer\n");
232 return -ENODEV;
233 }
234
235 thermal_data = (struct pmic_thermal_data *)
236 platform_get_device_id(pdev)->driver_data;
237 if (!thermal_data) {
238 dev_err(dev, "No thermal data initialized!!\n");
239 return -ENODEV;
240 }
241
242 regmap = pmic->regmap;
243 regmap_irq_chip = pmic->irq_chip_data;
244
245 pmic_irq_count = 0;
246 while ((irq = platform_get_irq(pdev, pmic_irq_count)) != -ENXIO) {
247 virq = regmap_irq_get_virq(regmap_irq_chip, irq);
248 if (virq < 0) {
249 dev_err(dev, "failed to get virq by irq %d\n", irq);
250 return virq;
251 }
252
253 ret = devm_request_threaded_irq(&pdev->dev, virq,
254 NULL, pmic_thermal_irq_handler,
255 IRQF_ONESHOT, "pmic_thermal", pdev);
256
257 if (ret) {
258 dev_err(dev, "request irq(%d) failed: %d\n", virq, ret);
259 return ret;
260 }
261 pmic_irq_count++;
262 }
263
264 /* Enable thermal interrupts */
265 for (i = 0; i < thermal_data->num_maps; i++) {
266 for (j = 0; j < thermal_data->maps[i].num_trips; j++) {
267 reg = thermal_data->maps[i].trip_config[j].irq_en;
268 mask = thermal_data->maps[i].trip_config[j].irq_en_mask;
269 ret = regmap_update_bits(regmap, reg, mask, 0x00);
270 if (ret)
271 return ret;
272 }
273 }
274
275 return 0;
276}
277
278static const struct platform_device_id pmic_thermal_id_table[] = {
279 {
280 .name = "bxt_wcove_thermal",
281 .driver_data = (kernel_ulong_t)&bxtwc_thermal_data,
282 },
283 {},
284};
285
286static struct platform_driver pmic_thermal_driver = {
287 .probe = pmic_thermal_probe,
288 .driver = {
289 .name = "pmic_thermal",
290 },
291 .id_table = pmic_thermal_id_table,
292};
293
294MODULE_DEVICE_TABLE(platform, pmic_thermal_id_table);
295module_platform_driver(pmic_thermal_driver);
296
297MODULE_AUTHOR("Yegnesh S Iyer <yegnesh.s.iyer@intel.com>");
298MODULE_DESCRIPTION("Intel Broxton PMIC Thermal Driver");
299MODULE_LICENSE("GPL v2");
300