1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // Copyright 2016 Freescale Semiconductor, Inc. 4 5 #include <linux/clk.h> 6 #include <linux/err.h> 7 #include <linux/io.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/platform_device.h> 11 #include <linux/regmap.h> 12 #include <linux/sizes.h> 13 #include <linux/thermal.h> 14 #include <linux/units.h> 15 16 #include "thermal_hwmon.h" 17 18 #define SITES_MAX 16 19 #define TMR_DISABLE 0x0 20 #define TMR_ME 0x80000000 21 #define TMR_ALPF 0x0c000000 22 #define TMR_ALPF_V2 0x03000000 23 #define TMTMIR_DEFAULT 0x0000000f 24 #define TIER_DISABLE 0x0 25 #define TEUMR0_V2 0x51009c00 26 #define TMSARA_V2 0xe 27 #define TMU_VER1 0x1 28 #define TMU_VER2 0x2 29 30 #define REGS_TMR 0x000 /* Mode Register */ 31 #define TMR_DISABLE 0x0 32 #define TMR_ME 0x80000000 33 #define TMR_ALPF 0x0c000000 34 35 #define REGS_TMTMIR 0x008 /* Temperature measurement interval Register */ 36 #define TMTMIR_DEFAULT 0x0000000f 37 38 #define REGS_V2_TMSR 0x008 /* monitor site register */ 39 40 #define REGS_V2_TMTMIR 0x00c /* Temperature measurement interval Register */ 41 42 #define REGS_TIER 0x020 /* Interrupt Enable Register */ 43 #define TIER_DISABLE 0x0 44 45 46 #define REGS_TTCFGR 0x080 /* Temperature Configuration Register */ 47 #define REGS_TSCFGR 0x084 /* Sensor Configuration Register */ 48 49 #define REGS_TRITSR(n) (0x100 + 16 * (n)) /* Immediate Temperature 50 * Site Register 51 */ 52 #define TRITSR_V BIT(31) 53 #define TRITSR_TP5 BIT(9) 54 #define REGS_V2_TMSAR(n) (0x304 + 16 * (n)) /* TMU monitoring 55 * site adjustment register 56 */ 57 #define REGS_TTRnCR(n) (0xf10 + 4 * (n)) /* Temperature Range n 58 * Control Register 59 */ 60 #define NUM_TTRCR_V1 4 61 #define NUM_TTRCR_MAX 16 62 63 #define REGS_IPBRR(n) (0xbf8 + 4 * (n)) /* IP Block Revision 64 * Register n 65 */ 66 #define REGS_V2_TEUMR(n) (0xf00 + 4 * (n)) 67 68 /* 69 * Thermal zone data 70 */ 71 struct qoriq_sensor { 72 int id; 73 }; 74 75 struct qoriq_tmu_data { 76 int ver; 77 u32 ttrcr[NUM_TTRCR_MAX]; 78 struct regmap *regmap; 79 struct clk *clk; 80 struct qoriq_sensor sensor[SITES_MAX]; 81 }; 82 83 static struct qoriq_tmu_data *qoriq_sensor_to_data(struct qoriq_sensor *s) 84 { 85 return container_of(s, struct qoriq_tmu_data, sensor[s->id]); 86 } 87 88 static int tmu_get_temp(struct thermal_zone_device *tz, int *temp) 89 { 90 struct qoriq_sensor *qsensor = thermal_zone_device_priv(tz); 91 struct qoriq_tmu_data *qdata = qoriq_sensor_to_data(qsensor); 92 u32 val; 93 /* 94 * REGS_TRITSR(id) has the following layout: 95 * 96 * For TMU Rev1: 97 * 31 ... 7 6 5 4 3 2 1 0 98 * V TEMP 99 * 100 * Where V bit signifies if the measurement is ready and is 101 * within sensor range. TEMP is an 8 bit value representing 102 * temperature in Celsius. 103 104 * For TMU Rev2: 105 * 31 ... 8 7 6 5 4 3 2 1 0 106 * V TEMP 107 * 108 * Where V bit signifies if the measurement is ready and is 109 * within sensor range. TEMP is an 9 bit value representing 110 * temperature in KelVin. 111 */ 112 113 regmap_read(qdata->regmap, REGS_TMR, &val); 114 if (!(val & TMR_ME)) 115 return -EAGAIN; 116 117 if (regmap_read_poll_timeout(qdata->regmap, 118 REGS_TRITSR(qsensor->id), 119 val, 120 val & TRITSR_V, 121 USEC_PER_MSEC, 122 10 * USEC_PER_MSEC)) 123 return -ENODATA; 124 125 if (qdata->ver == TMU_VER1) { 126 *temp = (val & GENMASK(7, 0)) * MILLIDEGREE_PER_DEGREE; 127 } else { 128 if (val & TRITSR_TP5) 129 *temp = milli_kelvin_to_millicelsius((val & GENMASK(8, 0)) * 130 MILLIDEGREE_PER_DEGREE + 500); 131 else 132 *temp = kelvin_to_millicelsius(val & GENMASK(8, 0)); 133 } 134 135 return 0; 136 } 137 138 static const struct thermal_zone_device_ops tmu_tz_ops = { 139 .get_temp = tmu_get_temp, 140 }; 141 142 static int qoriq_tmu_register_tmu_zone(struct device *dev, 143 struct qoriq_tmu_data *qdata) 144 { 145 int id, sites = 0; 146 147 for (id = 0; id < SITES_MAX; id++) { 148 struct thermal_zone_device *tzd; 149 struct qoriq_sensor *sensor = &qdata->sensor[id]; 150 int ret; 151 152 sensor->id = id; 153 154 tzd = devm_thermal_of_zone_register(dev, id, 155 sensor, 156 &tmu_tz_ops); 157 ret = PTR_ERR_OR_ZERO(tzd); 158 if (ret) { 159 if (ret == -ENODEV) 160 continue; 161 162 return ret; 163 } 164 165 if (qdata->ver == TMU_VER1) 166 sites |= 0x1 << (15 - id); 167 else 168 sites |= 0x1 << id; 169 170 devm_thermal_add_hwmon_sysfs(dev, tzd); 171 } 172 173 if (sites) { 174 if (qdata->ver == TMU_VER1) { 175 regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF | sites); 176 } else { 177 regmap_write(qdata->regmap, REGS_V2_TMSR, sites); 178 regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF_V2); 179 } 180 } 181 182 return 0; 183 } 184 185 static int qoriq_tmu_calibration(struct device *dev, 186 struct qoriq_tmu_data *data) 187 { 188 int i, val, len; 189 const u32 *calibration; 190 struct device_node *np = dev->of_node; 191 192 len = of_property_count_u32_elems(np, "fsl,tmu-range"); 193 if (len < 0 || (data->ver == TMU_VER1 && len > NUM_TTRCR_V1) || 194 (data->ver > TMU_VER1 && len > NUM_TTRCR_MAX)) { 195 dev_err(dev, "invalid range data.\n"); 196 return len; 197 } 198 199 val = of_property_read_u32_array(np, "fsl,tmu-range", data->ttrcr, len); 200 if (val != 0) { 201 dev_err(dev, "failed to read range data.\n"); 202 return val; 203 } 204 205 /* Init temperature range registers */ 206 for (i = 0; i < len; i++) 207 regmap_write(data->regmap, REGS_TTRnCR(i), data->ttrcr[i]); 208 209 calibration = of_get_property(np, "fsl,tmu-calibration", &len); 210 if (calibration == NULL || len % 8) { 211 dev_err(dev, "invalid calibration data.\n"); 212 return -ENODEV; 213 } 214 215 for (i = 0; i < len; i += 8, calibration += 2) { 216 val = of_read_number(calibration, 1); 217 regmap_write(data->regmap, REGS_TTCFGR, val); 218 val = of_read_number(calibration + 1, 1); 219 regmap_write(data->regmap, REGS_TSCFGR, val); 220 } 221 222 return 0; 223 } 224 225 static void qoriq_tmu_init_device(struct qoriq_tmu_data *data) 226 { 227 /* Disable interrupt, using polling instead */ 228 regmap_write(data->regmap, REGS_TIER, TIER_DISABLE); 229 230 /* Set update_interval */ 231 232 if (data->ver == TMU_VER1) { 233 regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT); 234 } else { 235 regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT); 236 regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2); 237 } 238 239 /* Disable monitoring */ 240 regmap_write(data->regmap, REGS_TMR, TMR_DISABLE); 241 } 242 243 static const struct regmap_range qoriq_yes_ranges[] = { 244 regmap_reg_range(REGS_TMR, REGS_TSCFGR), 245 regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(15)), 246 regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)), 247 regmap_reg_range(REGS_V2_TMSAR(0), REGS_V2_TMSAR(15)), 248 regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)), 249 /* Read only registers below */ 250 regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)), 251 }; 252 253 static const struct regmap_access_table qoriq_wr_table = { 254 .yes_ranges = qoriq_yes_ranges, 255 .n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges) - 1, 256 }; 257 258 static const struct regmap_access_table qoriq_rd_table = { 259 .yes_ranges = qoriq_yes_ranges, 260 .n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges), 261 }; 262 263 static void qoriq_tmu_action(void *p) 264 { 265 struct qoriq_tmu_data *data = p; 266 267 regmap_write(data->regmap, REGS_TMR, TMR_DISABLE); 268 clk_disable_unprepare(data->clk); 269 } 270 271 static int qoriq_tmu_probe(struct platform_device *pdev) 272 { 273 int ret; 274 u32 ver; 275 struct qoriq_tmu_data *data; 276 struct device_node *np = pdev->dev.of_node; 277 struct device *dev = &pdev->dev; 278 const bool little_endian = of_property_read_bool(np, "little-endian"); 279 const enum regmap_endian format_endian = 280 little_endian ? REGMAP_ENDIAN_LITTLE : REGMAP_ENDIAN_BIG; 281 const struct regmap_config regmap_config = { 282 .reg_bits = 32, 283 .val_bits = 32, 284 .reg_stride = 4, 285 .rd_table = &qoriq_rd_table, 286 .wr_table = &qoriq_wr_table, 287 .val_format_endian = format_endian, 288 .max_register = SZ_4K, 289 }; 290 void __iomem *base; 291 292 data = devm_kzalloc(dev, sizeof(struct qoriq_tmu_data), 293 GFP_KERNEL); 294 if (!data) 295 return -ENOMEM; 296 297 base = devm_platform_ioremap_resource(pdev, 0); 298 ret = PTR_ERR_OR_ZERO(base); 299 if (ret) { 300 dev_err(dev, "Failed to get memory region\n"); 301 return ret; 302 } 303 304 data->regmap = devm_regmap_init_mmio(dev, base, ®map_config); 305 ret = PTR_ERR_OR_ZERO(data->regmap); 306 if (ret) { 307 dev_err(dev, "Failed to init regmap (%d)\n", ret); 308 return ret; 309 } 310 311 data->clk = devm_clk_get_optional(dev, NULL); 312 if (IS_ERR(data->clk)) 313 return PTR_ERR(data->clk); 314 315 ret = clk_prepare_enable(data->clk); 316 if (ret) { 317 dev_err(dev, "Failed to enable clock\n"); 318 return ret; 319 } 320 321 ret = devm_add_action_or_reset(dev, qoriq_tmu_action, data); 322 if (ret) 323 return ret; 324 325 /* version register offset at: 0xbf8 on both v1 and v2 */ 326 ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver); 327 if (ret) { 328 dev_err(&pdev->dev, "Failed to read IP block version\n"); 329 return ret; 330 } 331 data->ver = (ver >> 8) & 0xff; 332 333 qoriq_tmu_init_device(data); /* TMU initialization */ 334 335 ret = qoriq_tmu_calibration(dev, data); /* TMU calibration */ 336 if (ret < 0) 337 return ret; 338 339 ret = qoriq_tmu_register_tmu_zone(dev, data); 340 if (ret < 0) { 341 dev_err(dev, "Failed to register sensors\n"); 342 return ret; 343 } 344 345 platform_set_drvdata(pdev, data); 346 347 return 0; 348 } 349 350 static int __maybe_unused qoriq_tmu_suspend(struct device *dev) 351 { 352 struct qoriq_tmu_data *data = dev_get_drvdata(dev); 353 int ret; 354 355 ret = regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, 0); 356 if (ret) 357 return ret; 358 359 clk_disable_unprepare(data->clk); 360 361 return 0; 362 } 363 364 static int __maybe_unused qoriq_tmu_resume(struct device *dev) 365 { 366 int ret; 367 struct qoriq_tmu_data *data = dev_get_drvdata(dev); 368 369 ret = clk_prepare_enable(data->clk); 370 if (ret) 371 return ret; 372 373 /* Enable monitoring */ 374 return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME); 375 } 376 377 static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops, 378 qoriq_tmu_suspend, qoriq_tmu_resume); 379 380 static const struct of_device_id qoriq_tmu_match[] = { 381 { .compatible = "fsl,qoriq-tmu", }, 382 { .compatible = "fsl,imx8mq-tmu", }, 383 {}, 384 }; 385 MODULE_DEVICE_TABLE(of, qoriq_tmu_match); 386 387 static struct platform_driver qoriq_tmu = { 388 .driver = { 389 .name = "qoriq_thermal", 390 .pm = &qoriq_tmu_pm_ops, 391 .of_match_table = qoriq_tmu_match, 392 }, 393 .probe = qoriq_tmu_probe, 394 }; 395 module_platform_driver(qoriq_tmu); 396 397 MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>"); 398 MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver"); 399 MODULE_LICENSE("GPL v2"); 400