path: root/drivers/regulator/da9121-regulator.c

// SPDX-License-Identifier: GPL-2.0-only
//
// DA9121 Single-channel dual-phase 10A buck converter
//
// Copyright (C) 2020 Axis Communications AB
//
// DA9130 Single-channel dual-phase 10A buck converter (Automotive)
// DA9217 Single-channel dual-phase  6A buck converter
// DA9122 Dual-channel single-phase  5A buck converter
// DA9131 Dual-channel single-phase  5A buck converter (Automotive)
// DA9220 Dual-channel single-phase  3A buck converter
// DA9132 Dual-channel single-phase  3A buck converter (Automotive)
//
// Copyright (C) 2020 Dialog Semiconductor

#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/of_regulator.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/regulator/da9121.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>

#include "da9121-regulator.h"

/* Chip data */
struct da9121 {
	struct device *dev;
	struct delayed_work work;
	struct da9121_pdata *pdata;
	struct regmap *regmap;
	struct regulator_dev *rdev[DA9121_IDX_MAX];
	unsigned int persistent[2];
	unsigned int passive_delay;
	int chip_irq;
	int variant_id;
};

/* Define ranges for different variants, enabling translation to/from
 * registers. Maximums give scope to allow for transients.
 */
struct da9121_range {
	int val_min;
	int val_max;
	int val_stp;
	int reg_min;
	int reg_max;
};

static struct da9121_range da9121_10A_2phase_current = {
	.val_min =  7000000,
	.val_max = 20000000,
	.val_stp =  1000000,
	.reg_min = 1,
	.reg_max = 14,
};

static struct da9121_range da9121_6A_2phase_current = {
	.val_min =  7000000,
	.val_max = 12000000,
	.val_stp =  1000000,
	.reg_min = 1,
	.reg_max = 6,
};

static struct da9121_range da9121_5A_1phase_current = {
	.val_min =  3500000,
	.val_max = 10000000,
	.val_stp =   500000,
	.reg_min = 1,
	.reg_max = 14,
};

static struct da9121_range da9121_3A_1phase_current = {
	.val_min = 3500000,
	.val_max = 6000000,
	.val_stp =  500000,
	.reg_min = 1,
	.reg_max = 6,
};

struct da9121_variant_info {
	int num_bucks;
	int num_phases;
	struct da9121_range *current_range;
};

static const struct da9121_variant_info variant_parameters[] = {
	{ 1, 2, &da9121_10A_2phase_current },	//DA9121_TYPE_DA9121_DA9130
	{ 2, 1, &da9121_3A_1phase_current  },	//DA9121_TYPE_DA9220_DA9132
	{ 2, 1, &da9121_5A_1phase_current  },	//DA9121_TYPE_DA9122_DA9131
	{ 1, 2, &da9121_6A_2phase_current  },	//DA9121_TYPE_DA9217
};

struct da9121_field {
	unsigned int reg;
	unsigned int msk;
};

static const struct da9121_field da9121_current_field[2] = {
	{ DA9121_REG_BUCK_BUCK1_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
	{ DA9xxx_REG_BUCK_BUCK2_2, DA9121_MASK_BUCK_BUCKx_2_CHx_ILIM },
};

static const struct da9121_field da9121_mode_field[2] = {
	{ DA9121_REG_BUCK_BUCK1_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
	{ DA9xxx_REG_BUCK_BUCK2_4, DA9121_MASK_BUCK_BUCKx_4_CHx_A_MODE },
};

struct status_event_data {
	int buck_id; /* 0=core, 1/2-buck */
	int reg_index;  /* index for status/event/mask register selection */
	int status_bit; /* bit masks... */
	int event_bit;
	int mask_bit;
	unsigned long notification; /* Notification for status inception */
	char *warn; /* if NULL, notify - otherwise dev_warn this string */
};

#define DA9121_STATUS(id, bank, name, notification, warning) \
	{ id, bank, \
	DA9121_MASK_SYS_STATUS_##bank##_##name, \
	DA9121_MASK_SYS_EVENT_##bank##_E_##name, \
	DA9121_MASK_SYS_MASK_##bank##_M_##name, \
	notification, warning }

/* For second buck related event bits that are specific to DA9122, DA9220 variants */
#define DA9xxx_STATUS(id, bank, name, notification, warning) \
	{ id, bank, \
	DA9xxx_MASK_SYS_STATUS_##bank##_##name, \
	DA9xxx_MASK_SYS_EVENT_##bank##_E_##name, \
	DA9xxx_MASK_SYS_MASK_##bank##_M_##name, \
	notification, warning }

/* The status signals that may need servicing, depending on device variant.
 * After assertion, they persist; so event is notified, the IRQ disabled,
 * and status polled until clear again and IRQ is reenabled.
 *
 * SG/PG1/PG2 should be set when device first powers up and should never
 * re-occur. When this driver starts, it is expected that these will have
 * self-cleared for when the IRQs are enabled, so these should never be seen.
 * If seen, the implication is that the device has reset.
 *
 * GPIO0/1/2 are not configured for use by default, so should not be seen.
 */
static const struct status_event_data status_event_handling[] = {
	DA9xxx_STATUS(0, 0, SG, 0, "Handled E_SG\n"),
	DA9121_STATUS(0, 0, TEMP_CRIT, (REGULATOR_EVENT_OVER_TEMP|REGULATOR_EVENT_DISABLE), NULL),
	DA9121_STATUS(0, 0, TEMP_WARN, REGULATOR_EVENT_OVER_TEMP, NULL),
	DA9121_STATUS(1, 1, PG1, 0, "Handled E_PG1\n"),
	DA9121_STATUS(1, 1, OV1, REGULATOR_EVENT_REGULATION_OUT, NULL),
	DA9121_STATUS(1, 1, UV1, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
	DA9121_STATUS(1, 1, OC1, REGULATOR_EVENT_OVER_CURRENT, NULL),
	DA9xxx_STATUS(2, 1, PG2, 0, "Handled E_PG2\n"),
	DA9xxx_STATUS(2, 1, OV2, REGULATOR_EVENT_REGULATION_OUT, NULL),
	DA9xxx_STATUS(2, 1, UV2, REGULATOR_EVENT_UNDER_VOLTAGE, NULL),
	DA9xxx_STATUS(2, 1, OC2, REGULATOR_EVENT_OVER_CURRENT, NULL),
	DA9121_STATUS(0, 2, GPIO0, 0, "Handled E_GPIO0\n"),
	DA9121_STATUS(0, 2, GPIO1, 0, "Handled E_GPIO1\n"),
	DA9121_STATUS(0, 2, GPIO2,