drivers/thermal/qoriq_thermal.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Copyright 2016 Freescale Semiconductor, Inc.
   4
   5 #include <linux/module.h>
   6 #include <linux/platform_device.h>
   7 #include <linux/err.h>
   8 #include <linux/io.h>
   9 #include <linux/of.h>
  10 #include <linux/of_address.h>
  11 #include <linux/thermal.h>
  12
  13 #include "thermal_core.h"
  14
  15 #define SITES_MAX       16
  16
  17 /*
  18  * QorIQ TMU Registers
  19  */
  20 struct qoriq_tmu_site_regs {
  21         u32 tritsr;             /* Immediate Temperature Site Register */
  22         u32 tratsr;             /* Average Temperature Site Register */
  23         u8 res0[0x8];
  24 };
  25
  26 struct qoriq_tmu_regs {
  27         u32 tmr;                /* Mode Register */
  28 #define TMR_DISABLE     0x0
  29 #define TMR_ME          0x80000000
  30 #define TMR_ALPF        0x0c000000
  31         u32 tsr;                /* Status Register */
  32         u32 tmtmir;             /* Temperature measurement interval Register */
  33 #define TMTMIR_DEFAULT  0x0000000f
  34         u8 res0[0x14];
  35         u32 tier;               /* Interrupt Enable Register */
  36 #define TIER_DISABLE    0x0
  37         u32 tidr;               /* Interrupt Detect Register */
  38         u32 tiscr;              /* Interrupt Site Capture Register */
  39         u32 ticscr;             /* Interrupt Critical Site Capture Register */
  40         u8 res1[0x10];
  41         u32 tmhtcrh;            /* High Temperature Capture Register */
  42         u32 tmhtcrl;            /* Low Temperature Capture Register */
  43         u8 res2[0x8];
  44         u32 tmhtitr;            /* High Temperature Immediate Threshold */
  45         u32 tmhtatr;            /* High Temperature Average Threshold */
  46         u32 tmhtactr;   /* High Temperature Average Crit Threshold */
  47         u8 res3[0x24];
  48         u32 ttcfgr;             /* Temperature Configuration Register */
  49         u32 tscfgr;             /* Sensor Configuration Register */
  50         u8 res4[0x78];
  51         struct qoriq_tmu_site_regs site[SITES_MAX];
  52         u8 res5[0x9f8];
  53         u32 ipbrr0;             /* IP Block Revision Register 0 */
  54         u32 ipbrr1;             /* IP Block Revision Register 1 */
  55         u8 res6[0x310];
  56         u32 ttr0cr;             /* Temperature Range 0 Control Register */
  57         u32 ttr1cr;             /* Temperature Range 1 Control Register */
  58         u32 ttr2cr;             /* Temperature Range 2 Control Register */
  59         u32 ttr3cr;             /* Temperature Range 3 Control Register */
  60 };
  61
  62 /*
  63  * Thermal zone data
  64  */
  65 struct qoriq_tmu_data {
  66         struct thermal_zone_device *tz;
  67         struct qoriq_tmu_regs __iomem *regs;
  68         int sensor_id;
  69         bool little_endian;
  70 };
  71
  72 static void tmu_write(struct qoriq_tmu_data *p, u32 val, void __iomem *addr)
  73 {
  74         if (p->little_endian)
  75                 iowrite32(val, addr);
  76         else
  77                 iowrite32be(val, addr);
  78 }
  79
  80 static u32 tmu_read(struct qoriq_tmu_data *p, void __iomem *addr)
  81 {
  82         if (p->little_endian)
  83                 return ioread32(addr);
  84         else
  85                 return ioread32be(addr);
  86 }
  87
  88 static int tmu_get_temp(void *p, int *temp)
  89 {
  90         u32 val;
  91         struct qoriq_tmu_data *data = p;
  92
  93         val = tmu_read(data, &data->regs->site[data->sensor_id].tritsr);
  94         *temp = (val & 0xff) * 1000;
  95
  96         return 0;
  97 }
  98
  99 static int qoriq_tmu_get_sensor_id(void)
 100 {
 101         int ret, id;
 102         struct of_phandle_args sensor_specs;
 103         struct device_node *np, *sensor_np;
 104
 105         np = of_find_node_by_name(NULL, "thermal-zones");
 106         if (!np)
 107                 return -ENODEV;
 108
 109         sensor_np = of_get_next_child(np, NULL);
 110         ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
 111                         "#thermal-sensor-cells",
 112                         0, &sensor_specs);
 113         if (ret) {
 114                 of_node_put(np);
 115                 of_node_put(sensor_np);
 116                 return ret;
 117         }
 118
 119         if (sensor_specs.args_count >= 1) {
 120                 id = sensor_specs.args[0];
 121                 WARN(sensor_specs.args_count > 1,
 122                                 "%s: too many cells in sensor specifier %d\n",
 123                                 sensor_specs.np->name, sensor_specs.args_count);
 124         } else {
 125                 id = 0;
 126         }
 127
 128         of_node_put(np);
 129         of_node_put(sensor_np);
 130
 131         return id;
 132 }
 133
 134 static int qoriq_tmu_calibration(struct platform_device *pdev)
 135 {
 136         int i, val, len;
 137         u32 range[4];
 138         const u32 *calibration;
 139         struct device_node *np = pdev->dev.of_node;
 140         struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
 141
 142         if (of_property_read_u32_array(np, "fsl,tmu-range", range, 4)) {
 143                 dev_err(&pdev->dev, "missing calibration range.\n");
 144                 return -ENODEV;
 145         }
 146
 147         /* Init temperature range registers */
 148         tmu_write(data, range[0], &data->regs->ttr0cr);
 149         tmu_write(data, range[1], &data->regs->ttr1cr);
 150         tmu_write(data, range[2], &data->regs->ttr2cr);
 151         tmu_write(data, range[3], &data->regs->ttr3cr);
 152
 153         calibration = of_get_property(np, "fsl,tmu-calibration", &len);
 154         if (calibration == NULL || len % 8) {
 155                 dev_err(&pdev->dev, "invalid calibration data.\n");
 156                 return -ENODEV;
 157         }
 158
 159         for (i = 0; i < len; i += 8, calibration += 2) {
 160                 val = of_read_number(calibration, 1);
 161                 tmu_write(data, val, &data->regs->ttcfgr);
 162                 val = of_read_number(calibration + 1, 1);
 163                 tmu_write(data, val, &data->regs->tscfgr);
 164         }
 165
 166         return 0;
 167 }
 168
 169 static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
 170 {
 171         /* Disable interrupt, using polling instead */
 172         tmu_write(data, TIER_DISABLE, &data->regs->tier);
 173
 174         /* Set update_interval */
 175         tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir);
 176
 177         /* Disable monitoring */
 178         tmu_write(data, TMR_DISABLE, &data->regs->tmr);
 179 }
 180
 181 static const struct thermal_zone_of_device_ops tmu_tz_ops = {
 182         .get_temp = tmu_get_temp,
 183 };
 184
 185 static int qoriq_tmu_probe(struct platform_device *pdev)
 186 {
 187         int ret;
 188         struct qoriq_tmu_data *data;
 189         struct device_node *np = pdev->dev.of_node;
 190         u32 site;
 191
 192         if (!np) {
 193                 dev_err(&pdev->dev, "Device OF-Node is NULL");
 194                 return -ENODEV;
 195         }
 196
 197         data = devm_kzalloc(&pdev->dev, sizeof(struct qoriq_tmu_data),
 198                             GFP_KERNEL);
 199         if (!data)
 200                 return -ENOMEM;
 201
 202         platform_set_drvdata(pdev, data);
 203
 204         data->little_endian = of_property_read_bool(np, "little-endian");
 205
 206         data->sensor_id = qoriq_tmu_get_sensor_id();
 207         if (data->sensor_id < 0) {
 208                 dev_err(&pdev->dev, "Failed to get sensor id\n");
 209                 ret = -ENODEV;
 210                 goto err_iomap;
 211         }
 212
 213         data->regs = of_iomap(np, 0);
 214         if (!data->regs) {
 215                 dev_err(&pdev->dev, "Failed to get memory region\n");
 216                 ret = -ENODEV;
 217                 goto err_iomap;
 218         }
 219
 220         qoriq_tmu_init_device(data);    /* TMU initialization */
 221
 222         ret = qoriq_tmu_calibration(pdev);      /* TMU calibration */
 223         if (ret < 0)
 224                 goto err_tmu;
 225
 226         data->tz = devm_thermal_zone_of_sensor_register(&pdev->dev,
 227                                                         data->sensor_id,
 228                                                         data, &tmu_tz_ops);
 229         if (IS_ERR(data->tz)) {
 230                 ret = PTR_ERR(data->tz);
 231                 dev_err(&pdev->dev,
 232                         "Failed to register thermal zone device %d\n", ret);
 233                 goto err_tmu;
 234         }
 235
 236         /* Enable monitoring */
 237         site = 0x1 << (15 - data->sensor_id);
 238         tmu_write(data, site | TMR_ME | TMR_ALPF, &data->regs->tmr);
 239
 240         return 0;
 241
 242 err_tmu:
 243         iounmap(data->regs);
 244
 245 err_iomap:
 246         platform_set_drvdata(pdev, NULL);
 247
 248         return ret;
 249 }
 250
 251 static int qoriq_tmu_remove(struct platform_device *pdev)
 252 {
 253         struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
 254
 255         /* Disable monitoring */
 256         tmu_write(data, TMR_DISABLE, &data->regs->tmr);
 257
 258         iounmap(data->regs);
 259         platform_set_drvdata(pdev, NULL);
 260
 261         return 0;
 262 }
 263
 264 #ifdef CONFIG_PM_SLEEP
 265 static int qoriq_tmu_suspend(struct device *dev)
 266 {
 267         u32 tmr;
 268         struct qoriq_tmu_data *data = dev_get_drvdata(dev);
 269
 270         /* Disable monitoring */
 271         tmr = tmu_read(data, &data->regs->tmr);
 272         tmr &= ~TMR_ME;
 273         tmu_write(data, tmr, &data->regs->tmr);
 274
 275         return 0;
 276 }
 277
 278 static int qoriq_tmu_resume(struct device *dev)
 279 {
 280         u32 tmr;
 281         struct qoriq_tmu_data *data = dev_get_drvdata(dev);
 282
 283         /* Enable monitoring */
 284         tmr = tmu_read(data, &data->regs->tmr);
 285         tmr |= TMR_ME;
 286         tmu_write(data, tmr, &data->regs->tmr);
 287
 288         return 0;
 289 }
 290 #endif
 291
 292 static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
 293                          qoriq_tmu_suspend, qoriq_tmu_resume);
 294
 295 static const struct of_device_id qoriq_tmu_match[] = {
 296         { .compatible = "fsl,qoriq-tmu", },
 297         {},
 298 };
 299 MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
 300
 301 static struct platform_driver qoriq_tmu = {
 302         .driver = {
 303                 .name           = "qoriq_thermal",
 304                 .pm             = &qoriq_tmu_pm_ops,
 305                 .of_match_table = qoriq_tmu_match,
 306         },
 307         .probe  = qoriq_tmu_probe,
 308         .remove = qoriq_tmu_remove,
 309 };
 310 module_platform_driver(qoriq_tmu);
 311
 312 MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>");
 313 MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
 314 MODULE_LICENSE("GPL v2");