drivers/thermal/intel_bxt_pmic_thermal.c

   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
  38 struct 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
  48 struct thermal_irq_map {
  49         char handle[20];
  50         int num_trips;
  51         const struct trip_config_map *trip_config;
  52 };
  53
  54 struct pmic_thermal_data {
  55         const struct thermal_irq_map *maps;
  56         int num_maps;
  57 };
  58
  59 static 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
  80 static 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
 101 static 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
 122 static 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
 134 static 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
 157 static 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
 162 static 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, trip;
 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                         trip = td->maps[i].trip_config[j].trip_num;
 205                         tzd = thermal_zone_get_zone_by_name(td->maps[i].handle);
 206                         if (!IS_ERR(tzd))
 207                                 thermal_zone_device_update(tzd,
 208                                                 THERMAL_EVENT_UNSPECIFIED);
 209
 210                         /* Clear the appropriate irq */
 211                         regmap_write(regmap, reg, reg_val & mask);
 212                 }
 213         }
 214
 215         return IRQ_HANDLED;
 216 }
 217
 218 static int pmic_thermal_probe(struct platform_device *pdev)
 219 {
 220         struct regmap_irq_chip_data *regmap_irq_chip;
 221         struct pmic_thermal_data *thermal_data;
 222         int ret, irq, virq, i, j, pmic_irq_count;
 223         struct intel_soc_pmic *pmic;
 224         struct regmap *regmap;
 225         struct device *dev;
 226         u16 reg;
 227         u8 mask;
 228
 229         dev = &pdev->dev;
 230         pmic = dev_get_drvdata(pdev->dev.parent);
 231         if (!pmic) {
 232                 dev_err(dev, "Failed to get struct intel_soc_pmic pointer\n");
 233                 return -ENODEV;
 234         }
 235
 236         thermal_data = (struct pmic_thermal_data *)
 237                                 platform_get_device_id(pdev)->driver_data;
 238         if (!thermal_data) {
 239                 dev_err(dev, "No thermal data initialized!!\n");
 240                 return -ENODEV;
 241         }
 242
 243         regmap = pmic->regmap;
 244         regmap_irq_chip = pmic->irq_chip_data;
 245
 246         pmic_irq_count = 0;
 247         while ((irq = platform_get_irq(pdev, pmic_irq_count)) != -ENXIO) {
 248                 virq = regmap_irq_get_virq(regmap_irq_chip, irq);
 249                 if (virq < 0) {
 250                         dev_err(dev, "failed to get virq by irq %d\n", irq);
 251                         return virq;
 252                 }
 253
 254                 ret = devm_request_threaded_irq(&pdev->dev, virq,
 255                                 NULL, pmic_thermal_irq_handler,
 256                                 IRQF_ONESHOT, "pmic_thermal", pdev);
 257
 258                 if (ret) {
 259                         dev_err(dev, "request irq(%d) failed: %d\n", virq, ret);
 260                         return ret;
 261                 }
 262                 pmic_irq_count++;
 263         }
 264
 265         /* Enable thermal interrupts */
 266         for (i = 0; i < thermal_data->num_maps; i++) {
 267                 for (j = 0; j < thermal_data->maps[i].num_trips; j++) {
 268                         reg = thermal_data->maps[i].trip_config[j].irq_en;
 269                         mask = thermal_data->maps[i].trip_config[j].irq_en_mask;
 270                         ret = regmap_update_bits(regmap, reg, mask, 0x00);
 271                         if (ret)
 272                                 return ret;
 273                 }
 274         }
 275
 276         return 0;
 277 }
 278
 279 static const struct platform_device_id pmic_thermal_id_table[] = {
 280         {
 281                 .name = "bxt_wcove_thermal",
 282                 .driver_data = (kernel_ulong_t)&bxtwc_thermal_data,
 283         },
 284         {},
 285 };
 286
 287 static struct platform_driver pmic_thermal_driver = {
 288         .probe = pmic_thermal_probe,
 289         .driver = {
 290                 .name = "pmic_thermal",
 291         },
 292         .id_table = pmic_thermal_id_table,
 293 };
 294
 295 MODULE_DEVICE_TABLE(platform, pmic_thermal_id_table);
 296 module_platform_driver(pmic_thermal_driver);
 297
 298 MODULE_AUTHOR("Yegnesh S Iyer <yegnesh.s.iyer@intel.com>");
 299 MODULE_DESCRIPTION("Intel Broxton PMIC Thermal Driver");
 300 MODULE_LICENSE("GPL v2");