drivers/thermal/ti-soc-thermal/ti-bandgap.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * OMAP4 Bandgap temperature sensor driver
   4  *
   5  * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/
   6  * Contact:
   7  *   Eduardo Valentin <eduardo.valentin@ti.com>
   8  */
   9 #ifndef __TI_BANDGAP_H
  10 #define __TI_BANDGAP_H
  11
  12 #include <linux/spinlock.h>
  13 #include <linux/types.h>
  14 #include <linux/err.h>
  15 #include <linux/cpu_pm.h>
  16 #include <linux/device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/pm.h>
  19
  20 struct gpio_desc;
  21
  22 /**
  23  * DOC: bandgap driver data structure
  24  * ==================================
  25  *
  26  *   +----------+----------------+
  27  *   | struct temp_sensor_regval |
  28  *   +---------------------------+
  29  *              * (Array of)
  30  *              |
  31  *              |
  32  *   +-------------------+   +-----------------+
  33  *   | struct ti_bandgap |-->| struct device * |
  34  *   +----------+--------+   +-----------------+
  35  *              |
  36  *              |
  37  *              V
  38  *   +------------------------+
  39  *   | struct ti_bandgap_data |
  40  *   +------------------------+
  41  *              |
  42  *              |
  43  *              * (Array of)
  44  * +------------+------------------------------------------------------+
  45  * | +----------+------------+   +-------------------------+           |
  46  * | | struct ti_temp_sensor |-->| struct temp_sensor_data |           |
  47  * | +-----------------------+   +------------+------------+           |
  48  * |            |                                                      |
  49  * |            +                                                      |
  50  * |            V                                                      |
  51  * | +----------+-------------------+                                  |
  52  * | | struct temp_sensor_registers |                                  |
  53  * | +------------------------------+                                  |
  54  * |                                                                   |
  55  * +-------------------------------------------------------------------+
  56  *
  57  * Above is a simple diagram describing how the data structure below
  58  * are organized. For each bandgap device there should be a ti_bandgap_data
  59  * containing the device instance configuration, as well as, an array of
  60  * sensors, representing every sensor instance present in this bandgap.
  61  */
  62
  63 /**
  64  * struct temp_sensor_registers - descriptor to access registers and bitfields
  65  * @temp_sensor_ctrl: TEMP_SENSOR_CTRL register offset
  66  * @bgap_tempsoff_mask: mask to temp_sensor_ctrl.tempsoff
  67  * @bgap_soc_mask: mask to temp_sensor_ctrl.soc
  68  * @bgap_eocz_mask: mask to temp_sensor_ctrl.eocz
  69  * @bgap_dtemp_mask: mask to temp_sensor_ctrl.dtemp
  70  * @bgap_mask_ctrl: BANDGAP_MASK_CTRL register offset
  71  * @mask_hot_mask: mask to bandgap_mask_ctrl.mask_hot
  72  * @mask_cold_mask: mask to bandgap_mask_ctrl.mask_cold
  73  * @mask_counter_delay_mask: mask to bandgap_mask_ctrl.mask_counter_delay
  74  * @mask_freeze_mask: mask to bandgap_mask_ctrl.mask_free
  75  * @bgap_mode_ctrl: BANDGAP_MODE_CTRL register offset
  76  * @mode_ctrl_mask: mask to bandgap_mode_ctrl.mode_ctrl
  77  * @bgap_counter: BANDGAP_COUNTER register offset
  78  * @counter_mask: mask to bandgap_counter.counter
  79  * @bgap_threshold: BANDGAP_THRESHOLD register offset (TALERT thresholds)
  80  * @threshold_thot_mask: mask to bandgap_threhold.thot
  81  * @threshold_tcold_mask: mask to bandgap_threhold.tcold
  82  * @tshut_threshold: TSHUT_THRESHOLD register offset (TSHUT thresholds)
  83  * @tshut_hot_mask: mask to tshut_threhold.thot
  84  * @tshut_cold_mask: mask to tshut_threhold.thot
  85  * @bgap_status: BANDGAP_STATUS register offset
  86  * @status_hot_mask: mask to bandgap_status.hot
  87  * @status_cold_mask: mask to bandgap_status.cold
  88  * @ctrl_dtemp_1: CTRL_DTEMP1 register offset
  89  * @ctrl_dtemp_2: CTRL_DTEMP2 register offset
  90  * @bgap_efuse: BANDGAP_EFUSE register offset
  91  *
  92  * The register offsets and bitfields might change across
  93  * OMAP and variants versions. Hence this struct serves as a
  94  * descriptor map on how to access the registers and the bitfields.
  95  *
  96  * This descriptor contains registers of all versions of bandgap chips.
  97  * Not all versions will use all registers, depending on the available
  98  * features. Please read TRMs for descriptive explanation on each bitfield.
  99  */
 100
 101 struct temp_sensor_registers {
 102         u32     temp_sensor_ctrl;
 103         u32     bgap_tempsoff_mask;
 104         u32     bgap_soc_mask;
 105         u32     bgap_eocz_mask;
 106         u32     bgap_dtemp_mask;
 107
 108         u32     bgap_mask_ctrl;
 109         u32     mask_hot_mask;
 110         u32     mask_cold_mask;
 111         u32     mask_counter_delay_mask;
 112         u32     mask_freeze_mask;
 113
 114         u32     bgap_mode_ctrl;
 115         u32     mode_ctrl_mask;
 116
 117         u32     bgap_counter;
 118         u32     counter_mask;
 119
 120         u32     bgap_threshold;
 121         u32     threshold_thot_mask;
 122         u32     threshold_tcold_mask;
 123
 124         u32     tshut_threshold;
 125         u32     tshut_hot_mask;
 126         u32     tshut_cold_mask;
 127
 128         u32     bgap_status;
 129         u32     status_hot_mask;
 130         u32     status_cold_mask;
 131
 132         u32     ctrl_dtemp_1;
 133         u32     ctrl_dtemp_2;
 134         u32     bgap_efuse;
 135 };
 136
 137 /**
 138  * struct temp_sensor_data - The thresholds and limits for temperature sensors.
 139  * @tshut_hot: temperature to trigger a thermal reset (initial value)
 140  * @tshut_cold: temp to get the plat out of reset due to thermal (init val)
 141  * @t_hot: temperature to trigger a thermal alert (high initial value)
 142  * @t_cold: temperature to trigger a thermal alert (low initial value)
 143  * @min_freq: sensor minimum clock rate
 144  * @max_freq: sensor maximum clock rate
 145  *
 146  * This data structure will hold the required thresholds and temperature limits
 147  * for a specific temperature sensor, like shutdown temperature, alert
 148  * temperature, clock / rate used, ADC conversion limits and update intervals
 149  */
 150 struct temp_sensor_data {
 151         u32     tshut_hot;
 152         u32     tshut_cold;
 153         u32     t_hot;
 154         u32     t_cold;
 155         u32     min_freq;
 156         u32     max_freq;
 157 };
 158
 159 struct ti_bandgap_data;
 160
 161 /**
 162  * struct temp_sensor_regval - temperature sensor register values and priv data
 163  * @bg_mode_ctrl: temp sensor control register value
 164  * @bg_ctrl: bandgap ctrl register value
 165  * @bg_counter: bandgap counter value
 166  * @bg_threshold: bandgap threshold register value
 167  * @tshut_threshold: bandgap tshut register value
 168  * @data: private data
 169  *
 170  * Data structure to save and restore bandgap register set context. Only
 171  * required registers are shadowed, when needed.
 172  */
 173 struct temp_sensor_regval {
 174         u32                     bg_mode_ctrl;
 175         u32                     bg_ctrl;
 176         u32                     bg_counter;
 177         u32                     bg_threshold;
 178         u32                     tshut_threshold;
 179         void                    *data;
 180 };
 181
 182 /**
 183  * struct ti_bandgap - bandgap device structure
 184  * @dev: struct device pointer
 185  * @base: io memory base address
 186  * @conf: struct with bandgap configuration set (# sensors, conv_table, etc)
 187  * @regval: temperature sensor register values
 188  * @fclock: pointer to functional clock of temperature sensor
 189  * @div_clk: pointer to divider clock of temperature sensor fclk
 190  * @lock: spinlock for ti_bandgap structure
 191  * @irq: MPU IRQ number for thermal alert
 192  * @tshut_gpio: GPIO where Tshut signal is routed
 193  * @clk_rate: Holds current clock rate
 194  *
 195  * The bandgap device structure representing the bandgap device instance.
 196  * It holds most of the dynamic stuff. Configurations and sensor specific
 197  * entries are inside the @conf structure.
 198  */
 199 struct ti_bandgap {
 200         struct device                   *dev;
 201         void __iomem                    *base;
 202         const struct ti_bandgap_data    *conf;
 203         struct temp_sensor_regval       *regval;
 204         struct clk                      *fclock;
 205         struct clk                      *div_clk;
 206         spinlock_t                      lock; /* shields this struct */
 207         int                             irq;
 208         struct gpio_desc                *tshut_gpiod;
 209         u32                             clk_rate;
 210         struct notifier_block           nb;
 211         unsigned int is_suspended:1;
 212 };
 213
 214 /**
 215  * struct ti_temp_sensor - bandgap temperature sensor configuration data
 216  * @ts_data: pointer to struct with thresholds, limits of temperature sensor
 217  * @registers: pointer to the list of register offsets and bitfields
 218  * @domain: the name of the domain where the sensor is located
 219  * @slope_pcb: sensor gradient slope info for hotspot extrapolation equation
 220  *             with no external influence
 221  * @constant_pcb: sensor gradient const info for hotspot extrapolation equation
 222  *             with no external influence
 223  * @register_cooling: function to describe how this sensor is going to be cooled
 224  * @unregister_cooling: function to release cooling data
 225  *
 226  * Data structure to describe a temperature sensor handled by a bandgap device.
 227  * It should provide configuration details on this sensor, such as how to
 228  * access the registers affecting this sensor, shadow register buffer, how to
 229  * assess the gradient from hotspot, how to cooldown the domain when sensor
 230  * reports too hot temperature.
 231  */
 232 struct ti_temp_sensor {
 233         struct temp_sensor_data         *ts_data;
 234         struct temp_sensor_registers    *registers;
 235         char                            *domain;
 236         /* for hotspot extrapolation */
 237         const int                       slope_pcb;
 238         const int                       constant_pcb;
 239         int (*register_cooling)(struct ti_bandgap *bgp, int id);
 240         int (*unregister_cooling)(struct ti_bandgap *bgp, int id);
 241 };
 242
 243 /**
 244  * DOC: ti bandgap feature types
 245  *
 246  * TI_BANDGAP_FEATURE_TSHUT - used when the thermal shutdown signal output
 247  *      of a bandgap device instance is routed to the processor. This means
 248  *      the system must react and perform the shutdown by itself (handle an
 249  *      IRQ, for instance).
 250  *
 251  * TI_BANDGAP_FEATURE_TSHUT_CONFIG - used when the bandgap device has control
 252  *      over the thermal shutdown configuration. This means that the thermal
 253  *      shutdown thresholds are programmable, for instance.
 254  *
 255  * TI_BANDGAP_FEATURE_TALERT - used when the bandgap device instance outputs
 256  *      a signal representing violation of programmable alert thresholds.
 257  *
 258  * TI_BANDGAP_FEATURE_MODE_CONFIG - used when it is possible to choose which
 259  *      mode, continuous or one shot, the bandgap device instance will operate.
 260  *
 261  * TI_BANDGAP_FEATURE_COUNTER - used when the bandgap device instance allows
 262  *      programming the update interval of its internal state machine.
 263  *
 264  * TI_BANDGAP_FEATURE_POWER_SWITCH - used when the bandgap device allows
 265  *      itself to be switched on/off.
 266  *
 267  * TI_BANDGAP_FEATURE_CLK_CTRL - used when the clocks feeding the bandgap
 268  *      device are gateable or not.
 269  *
 270  * TI_BANDGAP_FEATURE_FREEZE_BIT - used when the bandgap device features
 271  *      a history buffer that its update can be freezed/unfreezed.
 272  *
 273  * TI_BANDGAP_FEATURE_COUNTER_DELAY - used when the bandgap device features
 274  *      a delay programming based on distinct values.
 275  *
 276  * TI_BANDGAP_FEATURE_HISTORY_BUFFER - used when the bandgap device features
 277  *      a history buffer of temperatures.
 278  *
 279  * TI_BANDGAP_FEATURE_ERRATA_814 - used to workaorund when the bandgap device
 280  *      has Errata 814
 281  * TI_BANDGAP_FEATURE_UNRELIABLE - used when the sensor readings are too
 282  *      inaccurate.
 283  * TI_BANDGAP_HAS(b, f) - macro to check if a bandgap device is capable of a
 284  *      specific feature (above) or not. Return non-zero, if yes.
 285  */
 286 #define TI_BANDGAP_FEATURE_TSHUT                BIT(0)
 287 #define TI_BANDGAP_FEATURE_TSHUT_CONFIG         BIT(1)
 288 #define TI_BANDGAP_FEATURE_TALERT               BIT(2)
 289 #define TI_BANDGAP_FEATURE_MODE_CONFIG          BIT(3)
 290 #define TI_BANDGAP_FEATURE_COUNTER              BIT(4)
 291 #define TI_BANDGAP_FEATURE_POWER_SWITCH         BIT(5)
 292 #define TI_BANDGAP_FEATURE_CLK_CTRL             BIT(6)
 293 #define TI_BANDGAP_FEATURE_FREEZE_BIT           BIT(7)
 294 #define TI_BANDGAP_FEATURE_COUNTER_DELAY        BIT(8)
 295 #define TI_BANDGAP_FEATURE_HISTORY_BUFFER       BIT(9)
 296 #define TI_BANDGAP_FEATURE_ERRATA_814           BIT(10)
 297 #define TI_BANDGAP_FEATURE_UNRELIABLE           BIT(11)
 298 #define TI_BANDGAP_HAS(b, f)                    \
 299                         ((b)->conf->features & TI_BANDGAP_FEATURE_ ## f)
 300
 301 /**
 302  * struct ti_bandgap_data - ti bandgap data configuration structure
 303  * @features: a bitwise flag set to describe the device features
 304  * @conv_table: Pointer to ADC to temperature conversion table
 305  * @adc_start_val: ADC conversion table starting value
 306  * @adc_end_val: ADC conversion table ending value
 307  * @fclock_name: clock name of the functional clock
 308  * @div_ck_name: clock name of the clock divisor
 309  * @sensor_count: count of temperature sensor within this bandgap device
 310  * @report_temperature: callback to report thermal alert to thermal API
 311  * @expose_sensor: callback to export sensor to thermal API
 312  * @remove_sensor: callback to destroy sensor from thermal API
 313  * @sensors: array of sensors present in this bandgap instance
 314  *
 315  * This is a data structure which should hold most of the static configuration
 316  * of a bandgap device instance. It should describe which features this instance
 317  * is capable of, the clock names to feed this device, the amount of sensors and
 318  * their configuration representation, and how to export and unexport them to
 319  * a thermal API.
 320  */
 321 struct ti_bandgap_data {
 322         unsigned int                    features;
 323         const int                       *conv_table;
 324         u32                             adc_start_val;
 325         u32                             adc_end_val;
 326         char                            *fclock_name;
 327         char                            *div_ck_name;
 328         int                             sensor_count;
 329         int (*report_temperature)(struct ti_bandgap *bgp, int id);
 330         int (*expose_sensor)(struct ti_bandgap *bgp, int id, char *domain);
 331         int (*remove_sensor)(struct ti_bandgap *bgp, int id);
 332
 333         /* this needs to be at the end */
 334         struct ti_temp_sensor           sensors[];
 335 };
 336
 337 int ti_bandgap_read_thot(struct ti_bandgap *bgp, int id, int *thot);
 338 int ti_bandgap_write_thot(struct ti_bandgap *bgp, int id, int val);
 339 int ti_bandgap_read_tcold(struct ti_bandgap *bgp, int id, int *tcold);
 340 int ti_bandgap_write_tcold(struct ti_bandgap *bgp, int id, int val);
 341 int ti_bandgap_read_update_interval(struct ti_bandgap *bgp, int id,
 342                                     int *interval);
 343 int ti_bandgap_write_update_interval(struct ti_bandgap *bgp, int id,
 344                                      u32 interval);
 345 int ti_bandgap_read_temperature(struct ti_bandgap *bgp, int id,
 346                                   int *temperature);
 347 int ti_bandgap_set_sensor_data(struct ti_bandgap *bgp, int id, void *data);
 348 void *ti_bandgap_get_sensor_data(struct ti_bandgap *bgp, int id);
 349 int ti_bandgap_get_trend(struct ti_bandgap *bgp, int id, int *trend);
 350
 351 #ifdef CONFIG_OMAP3_THERMAL
 352 extern const struct ti_bandgap_data omap34xx_data;
 353 extern const struct ti_bandgap_data omap36xx_data;
 354 #else
 355 #define omap34xx_data                                   NULL
 356 #define omap36xx_data                                   NULL
 357 #endif
 358
 359 #ifdef CONFIG_OMAP4_THERMAL
 360 extern const struct ti_bandgap_data omap4430_data;
 361 extern const struct ti_bandgap_data omap4460_data;
 362 extern const struct ti_bandgap_data omap4470_data;
 363 #else
 364 #define omap4430_data                                   NULL
 365 #define omap4460_data                                   NULL
 366 #define omap4470_data                                   NULL
 367 #endif
 368
 369 #ifdef CONFIG_OMAP5_THERMAL
 370 extern const struct ti_bandgap_data omap5430_data;
 371 #else
 372 #define omap5430_data                                   NULL
 373 #endif
 374
 375 #ifdef CONFIG_DRA752_THERMAL
 376 extern const struct ti_bandgap_data dra752_data;
 377 #else
 378 #define dra752_data                                     NULL
 379 #endif
 380 #endif