drivers/thermal/qoriq_thermal.c

   1 /*
   2  * Copyright 2016 Freescale Semiconductor, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21 #include <linux/thermal.h>
  22
  23 #include "thermal_core.h"
  24
  25 #define SITES_MAX       16
  26
  27 /*
  28  * QorIQ TMU Registers
  29  */
  30 struct qoriq_tmu_site_regs {
  31         u32 tritsr;             /* Immediate Temperature Site Register */
  32         u32 tratsr;             /* Average Temperature Site Register */
  33         u8 res0[0x8];
  34 };
  35
  36 struct qoriq_tmu_regs {
  37         u32 tmr;                /* Mode Register */
  38 #define TMR_DISABLE     0x0
  39 #define TMR_ME          0x80000000
  40 #define TMR_ALPF        0x0c000000
  41         u32 tsr;                /* Status Register */
  42         u32 tmtmir;             /* Temperature measurement interval Register */
  43 #define TMTMIR_DEFAULT  0x0000000f
  44         u8 res0[0x14];
  45         u32 tier;               /* Interrupt Enable Register */
  46 #define TIER_DISABLE    0x0
  47         u32 tidr;               /* Interrupt Detect Register */
  48         u32 tiscr;              /* Interrupt Site Capture Register */
  49         u32 ticscr;             /* Interrupt Critical Site Capture Register */
  50         u8 res1[0x10];
  51         u32 tmhtcrh;            /* High Temperature Capture Register */
  52         u32 tmhtcrl;            /* Low Temperature Capture Register */
  53         u8 res2[0x8];
  54         u32 tmhtitr;            /* High Temperature Immediate Threshold */
  55         u32 tmhtatr;            /* High Temperature Average Threshold */
  56         u32 tmhtactr;   /* High Temperature Average Crit Threshold */
  57         u8 res3[0x24];
  58         u32 ttcfgr;             /* Temperature Configuration Register */
  59         u32 tscfgr;             /* Sensor Configuration Register */
  60         u8 res4[0x78];
  61         struct qoriq_tmu_site_regs site[SITES_MAX];
  62         u8 res5[0x9f8];
  63         u32 ipbrr0;             /* IP Block Revision Register 0 */
  64         u32 ipbrr1;             /* IP Block Revision Register 1 */
  65         u8 res6[0x310];
  66         u32 ttr0cr;             /* Temperature Range 0 Control Register */
  67         u32 ttr1cr;             /* Temperature Range 1 Control Register */
  68         u32 ttr2cr;             /* Temperature Range 2 Control Register */
  69         u32 ttr3cr;             /* Temperature Range 3 Control Register */
  70 };
  71
  72 /*
  73  * Thermal zone data
  74  */
  75 struct qoriq_tmu_data {
  76         struct thermal_zone_device *tz;
  77         struct qoriq_tmu_regs __iomem *regs;
  78         int sensor_id;
  79         bool little_endian;
  80 };
  81
  82 static void tmu_write(struct qoriq_tmu_data *p, u32 val, void __iomem *addr)
  83 {
  84         if (p->little_endian)
  85                 iowrite32(val, addr);
  86         else
  87                 iowrite32be(val, addr);
  88 }
  89
  90 static u32 tmu_read(struct qoriq_tmu_data *p, void __iomem *addr)
  91 {
  92         if (p->little_endian)
  93                 return ioread32(addr);
  94         else
  95                 return ioread32be(addr);
  96 }
  97
  98 static int tmu_get_temp(void *p, int *temp)
  99 {
 100         u32 val;
 101         struct qoriq_tmu_data *data = p;
 102
 103         val = tmu_read(data, &data->regs->site[data->sensor_id].tritsr);
 104         *temp = (val & 0xff) * 1000;
 105
 106         return 0;
 107 }
 108
 109 static int qoriq_tmu_get_sensor_id(void)
 110 {
 111         int ret, id;
 112         struct of_phandle_args sensor_specs;
 113         struct device_node *np, *sensor_np;
 114
 115         np = of_find_node_by_name(NULL, "thermal-zones");
 116         if (!np)
 117                 return -ENODEV;
 118
 119         sensor_np = of_get_next_child(np, NULL);
 120         ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
 121                         "#thermal-sensor-cells",
 122                         0, &sensor_specs);
 123         if (ret) {
 124                 of_node_put(np);
 125                 of_node_put(sensor_np);
 126                 return ret;
 127         }
 128
 129         if (sensor_specs.args_count >= 1) {
 130                 id = sensor_specs.args[0];
 131                 WARN(sensor_specs.args_count > 1,
 132                                 "%s: too many cells in sensor specifier %d\n",
 133                                 sensor_specs.np->name, sensor_specs.args_count);
 134         } else {
 135                 id = 0;
 136         }
 137
 138         of_node_put(np);
 139         of_node_put(sensor_np);
 140
 141         return id;
 142 }
 143
 144 static int qoriq_tmu_calibration(struct platform_device *pdev)
 145 {
 146         int i, val, len;
 147         u32 range[4];
 148         const u32 *calibration;
 149         struct device_node *np = pdev->dev.of_node;
 150         struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
 151
 152         if (of_property_read_u32_array(np, "fsl,tmu-range", range, 4)) {
 153                 dev_err(&pdev->dev, "missing calibration range.\n");
 154                 return -ENODEV;
 155         }
 156
 157         /* Init temperature range registers */
 158         tmu_write(data, range[0], &data->regs->ttr0cr);
 159         tmu_write(data, range[1], &data->regs->ttr1cr);
 160         tmu_write(data, range[2], &data->regs->ttr2cr);
 161         tmu_write(data, range[3], &data->regs->ttr3cr);
 162
 163         calibration = of_get_property(np, "fsl,tmu-calibration", &len);
 164         if (calibration == NULL || len % 8) {
 165                 dev_err(&pdev->dev, "invalid calibration data.\n");
 166                 return -ENODEV;
 167         }
 168
 169         for (i = 0; i < len; i += 8, calibration += 2) {
 170                 val = of_read_number(calibration, 1);
 171                 tmu_write(data, val, &data->regs->ttcfgr);
 172                 val = of_read_number(calibration + 1, 1);
 173                 tmu_write(data, val, &data->regs->tscfgr);
 174         }
 175
 176         return 0;
 177 }
 178
 179 static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
 180 {
 181         /* Disable interrupt, using polling instead */
 182         tmu_write(data, TIER_DISABLE, &data->regs->tier);
 183
 184         /* Set update_interval */
 185         tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir);
 186
 187         /* Disable monitoring */
 188         tmu_write(data, TMR_DISABLE, &data->regs->tmr);
 189 }
 190
 191 static const struct thermal_zone_of_device_ops tmu_tz_ops = {
 192         .get_temp = tmu_get_temp,
 193 };
 194
 195 static int qoriq_tmu_probe(struct platform_device *pdev)
 196 {
 197         int ret;
 198         struct qoriq_tmu_data *data;
 199         struct device_node *np = pdev->dev.of_node;
 200         u32 site = 0;
 201
 202         if (!np) {
 203                 dev_err(&pdev->dev, "Device OF-Node is NULL");
 204                 return -ENODEV;
 205         }
 206
 207         data = devm_kzalloc(&pdev->dev, sizeof(struct qoriq_tmu_data),
 208                             GFP_KERNEL);
 209         if (!data)
 210                 return -ENOMEM;
 211
 212         platform_set_drvdata(pdev, data);
 213
 214         data->little_endian = of_property_read_bool(np, "little-endian");
 215
 216         data->sensor_id = qoriq_tmu_get_sensor_id();
 217         if (data->sensor_id < 0) {
 218                 dev_err(&pdev->dev, "Failed to get sensor id\n");
 219                 ret = -ENODEV;
 220                 goto err_iomap;
 221         }
 222
 223         data->regs = of_iomap(np, 0);
 224         if (!data->regs) {
 225                 dev_err(&pdev->dev, "Failed to get memory region\n");
 226                 ret = -ENODEV;
 227                 goto err_iomap;
 228         }
 229
 230         qoriq_tmu_init_device(data);    /* TMU initialization */
 231
 232         ret = qoriq_tmu_calibration(pdev);      /* TMU calibration */
 233         if (ret < 0)
 234                 goto err_tmu;
 235
 236         data->tz = thermal_zone_of_sensor_register(&pdev->dev, data->sensor_id,
 237                                 data, &tmu_tz_ops);
 238         if (IS_ERR(data->tz)) {
 239                 ret = PTR_ERR(data->tz);
 240                 dev_err(&pdev->dev,
 241                         "Failed to register thermal zone device %d\n", ret);
 242                 goto err_tmu;
 243         }
 244
 245         /* Enable monitoring */
 246         site |= 0x1 << (15 - data->sensor_id);
 247         tmu_write(data, site | TMR_ME | TMR_ALPF, &data->regs->tmr);
 248
 249         return 0;
 250
 251 err_tmu:
 252         iounmap(data->regs);
 253
 254 err_iomap:
 255         platform_set_drvdata(pdev, NULL);
 256
 257         return ret;
 258 }
 259
 260 static int qoriq_tmu_remove(struct platform_device *pdev)
 261 {
 262         struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
 263
 264         thermal_zone_of_sensor_unregister(&pdev->dev, data->tz);
 265
 266         /* Disable monitoring */
 267         tmu_write(data, TMR_DISABLE, &data->regs->tmr);
 268
 269         iounmap(data->regs);
 270         platform_set_drvdata(pdev, NULL);
 271
 272         return 0;
 273 }
 274
 275 #ifdef CONFIG_PM_SLEEP
 276 static int qoriq_tmu_suspend(struct device *dev)
 277 {
 278         u32 tmr;
 279         struct qoriq_tmu_data *data = dev_get_drvdata(dev);
 280
 281         /* Disable monitoring */
 282         tmr = tmu_read(data, &data->regs->tmr);
 283         tmr &= ~TMR_ME;
 284         tmu_write(data, tmr, &data->regs->tmr);
 285
 286         return 0;
 287 }
 288
 289 static int qoriq_tmu_resume(struct device *dev)
 290 {
 291         u32 tmr;
 292         struct qoriq_tmu_data *data = dev_get_drvdata(dev);
 293
 294         /* Enable monitoring */
 295         tmr = tmu_read(data, &data->regs->tmr);
 296         tmr |= TMR_ME;
 297         tmu_write(data, tmr, &data->regs->tmr);
 298
 299         return 0;
 300 }
 301 #endif
 302
 303 static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
 304                          qoriq_tmu_suspend, qoriq_tmu_resume);
 305
 306 static const struct of_device_id qoriq_tmu_match[] = {
 307         { .compatible = "fsl,qoriq-tmu", },
 308         {},
 309 };
 310 MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
 311
 312 static struct platform_driver qoriq_tmu = {
 313         .driver = {
 314                 .name           = "qoriq_thermal",
 315                 .pm             = &qoriq_tmu_pm_ops,
 316                 .of_match_table = qoriq_tmu_match,
 317         },
 318         .probe  = qoriq_tmu_probe,
 319         .remove = qoriq_tmu_remove,
 320 };
 321 module_platform_driver(qoriq_tmu);
 322
 323 MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>");
 324 MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
 325 MODULE_LICENSE("GPL v2");