// SPDX-License-Identifier: GPL-2.0-only /* * Marvell EBU Armada SoCs thermal sensor driver * * Copyright (C) 2013 Marvell */ #include <linux/device.h> #include <linux/err.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/of.h> #include <linux/module.h> #include <linux/delay.h> #include <linux/platform_device.h> #include <linux/of_device.h> #include <linux/thermal.h> #include <linux/iopoll.h> #include <linux/mfd/syscon.h> #include <linux/regmap.h> #include <linux/interrupt.h> /* Thermal Manager Control and Status Register */ #define PMU_TDC0_SW_RST_MASK … #define PMU_TM_DISABLE_OFFS … #define PMU_TM_DISABLE_MASK … #define PMU_TDC0_REF_CAL_CNT_OFFS … #define PMU_TDC0_REF_CAL_CNT_MASK … #define PMU_TDC0_OTF_CAL_MASK … #define PMU_TDC0_START_CAL_MASK … #define A375_UNIT_CONTROL_SHIFT … #define A375_UNIT_CONTROL_MASK … #define A375_READOUT_INVERT … #define A375_HW_RESETn … /* Errata fields */ #define CONTROL0_TSEN_TC_TRIM_MASK … #define CONTROL0_TSEN_TC_TRIM_VAL … #define CONTROL0_TSEN_START … #define CONTROL0_TSEN_RESET … #define CONTROL0_TSEN_ENABLE … #define CONTROL0_TSEN_AVG_BYPASS … #define CONTROL0_TSEN_CHAN_SHIFT … #define CONTROL0_TSEN_CHAN_MASK … #define CONTROL0_TSEN_OSR_SHIFT … #define CONTROL0_TSEN_OSR_MAX … #define CONTROL0_TSEN_MODE_SHIFT … #define CONTROL0_TSEN_MODE_EXTERNAL … #define CONTROL0_TSEN_MODE_MASK … #define CONTROL1_TSEN_AVG_MASK … #define CONTROL1_EXT_TSEN_SW_RESET … #define CONTROL1_EXT_TSEN_HW_RESETn … #define CONTROL1_TSEN_INT_EN … #define CONTROL1_TSEN_SELECT_OFF … #define CONTROL1_TSEN_SELECT_MASK … #define STATUS_POLL_PERIOD_US … #define STATUS_POLL_TIMEOUT_US … #define OVERHEAT_INT_POLL_DELAY_MS … struct armada_thermal_data; /* Marvell EBU Thermal Sensor Dev Structure */ struct armada_thermal_priv { … }; struct armada_thermal_data { … }; struct armada_drvdata { … }; /* * struct armada_thermal_sensor - hold the information of one thermal sensor * @thermal: pointer to the local private structure * @tzd: pointer to the thermal zone device * @id: identifier of the thermal sensor */ struct armada_thermal_sensor { … }; static void armadaxp_init(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static void armada370_init(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static void armada375_init(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static int armada_wait_sensor_validity(struct armada_thermal_priv *priv) { … } static void armada380_init(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static void armada_ap80x_init(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static void armada_cp110_init(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static bool armada_is_valid(struct armada_thermal_priv *priv) { … } static void armada_enable_overheat_interrupt(struct armada_thermal_priv *priv) { … } static void __maybe_unused armada_disable_overheat_interrupt(struct armada_thermal_priv *priv) { … } /* There is currently no board with more than one sensor per channel */ static int armada_select_channel(struct armada_thermal_priv *priv, int channel) { … } static int armada_read_sensor(struct armada_thermal_priv *priv, int *temp) { … } static int armada_get_temp_legacy(struct thermal_zone_device *thermal, int *temp) { … } static struct thermal_zone_device_ops legacy_ops = …; static int armada_get_temp(struct thermal_zone_device *tz, int *temp) { … } static const struct thermal_zone_device_ops of_ops = …; static unsigned int armada_mc_to_reg_temp(struct armada_thermal_data *data, unsigned int temp_mc) { … } /* * The documentation states: * high/low watermark = threshold +/- 0.4761 * 2^(hysteresis + 2) * which is the mathematical derivation for: * 0x0 <=> 1.9°C, 0x1 <=> 3.8°C, 0x2 <=> 7.6°C, 0x3 <=> 15.2°C */ static unsigned int hyst_levels_mc[] = …; static unsigned int armada_mc_to_reg_hyst(struct armada_thermal_data *data, unsigned int hyst_mc) { … } static void armada_set_overheat_thresholds(struct armada_thermal_priv *priv, int thresh_mc, int hyst_mc) { … } static irqreturn_t armada_overheat_isr(int irq, void *blob) { … } static irqreturn_t armada_overheat_isr_thread(int irq, void *blob) { … } static const struct armada_thermal_data armadaxp_data = …; static const struct armada_thermal_data armada370_data = …; static const struct armada_thermal_data armada375_data = …; static const struct armada_thermal_data armada380_data = …; static const struct armada_thermal_data armada_ap806_data = …; static const struct armada_thermal_data armada_ap807_data = …; static const struct armada_thermal_data armada_cp110_data = …; static const struct of_device_id armada_thermal_id_table[] = …; MODULE_DEVICE_TABLE(of, armada_thermal_id_table); static const struct regmap_config armada_thermal_regmap_config = …; static int armada_thermal_probe_legacy(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static int armada_thermal_probe_syscon(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } static void armada_set_sane_name(struct platform_device *pdev, struct armada_thermal_priv *priv) { … } /* * The IP can manage to trigger interrupts on overheat situation from all the * sensors. However, the interrupt source changes along with the last selected * source (ie. the last read sensor), which is an inconsistent behavior. Avoid * possible glitches by always selecting back only one channel (arbitrarily: the * first in the DT which has a critical trip point). We also disable sensor * switch during overheat situations. */ static int armada_configure_overheat_int(struct armada_thermal_priv *priv, struct thermal_zone_device *tz, int sensor_id) { … } static int armada_thermal_probe(struct platform_device *pdev) { … } static void armada_thermal_exit(struct platform_device *pdev) { … } static struct platform_driver armada_thermal_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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