linux-imx

/*

 * Marvell EBU Armada SoCs thermal sensor driver

 *

 * Copyright (C) 2013 Marvell

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 */

#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>

​

#include "thermal_core.h"

​

#define TO_MCELSIUS(c)          ((c) * 1000)

​

/* Thermal Manager Control and Status Register */

#define PMU_TDC0_SW_RST_MASK        (0x1 << 1)

#define PMU_TM_DISABLE_OFFS     0

#define PMU_TM_DISABLE_MASK     (0x1 << PMU_TM_DISABLE_OFFS)

#define PMU_TDC0_REF_CAL_CNT_OFFS   11

#define PMU_TDC0_REF_CAL_CNT_MASK   (0x1ff << PMU_TDC0_REF_CAL_CNT_OFFS)

#define PMU_TDC0_OTF_CAL_MASK       (0x1 << 30)

#define PMU_TDC0_START_CAL_MASK     (0x1 << 25)

​

#define A375_UNIT_CONTROL_SHIFT     27

#define A375_UNIT_CONTROL_MASK      0x7

#define A375_READOUT_INVERT     BIT(15)

#define A375_HW_RESETn          BIT(8)

​

/* Errata fields */

#define CONTROL0_TSEN_TC_TRIM_MASK  0x7

#define CONTROL0_TSEN_TC_TRIM_VAL   0x3

​

#define CONTROL0_TSEN_START     BIT(0)

#define CONTROL0_TSEN_RESET     BIT(1)

#define CONTROL0_TSEN_ENABLE        BIT(2)

#define CONTROL0_TSEN_AVG_BYPASS    BIT(6)

#define CONTROL0_TSEN_CHAN_SHIFT    13

#define CONTROL0_TSEN_CHAN_MASK     0xF

#define CONTROL0_TSEN_OSR_SHIFT     24

#define CONTROL0_TSEN_OSR_MAX       0x3

#define CONTROL0_TSEN_MODE_SHIFT    30

#define CONTROL0_TSEN_MODE_EXTERNAL 0x2

#define CONTROL0_TSEN_MODE_MASK     0x3

​

#define CONTROL1_TSEN_AVG_SHIFT     0

#define CONTROL1_TSEN_AVG_MASK      0x7

#define CONTROL1_EXT_TSEN_SW_RESET  BIT(7)

#define CONTROL1_EXT_TSEN_HW_RESETn BIT(8)

#define CONTROL1_TSEN_INT_EN        BIT(25)

#define CONTROL1_TSEN_SELECT_OFF    21

#define CONTROL1_TSEN_SELECT_MASK   0x3

​

#define STATUS_POLL_PERIOD_US       1000

#define STATUS_POLL_TIMEOUT_US      100000

#define OVERHEAT_INT_POLL_DELAY_MS  1000

​

struct armada_thermal_data;

​

/* Marvell EBU Thermal Sensor Dev Structure */

struct armada_thermal_priv {

    struct device *dev;

    struct regmap *syscon;

    char zone_name[THERMAL_NAME_LENGTH];

    /* serialize temperature reads/updates */

    struct mutex update_lock;

    struct armada_thermal_data *data;

    struct thermal_zone_device *overheat_sensor;

    int interrupt_source;

    int current_channel;

    long current_threshold;

    long current_hysteresis;

};