// 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.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;
int subvariant_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 const struct da9121_range da9121_10A_2phase_current = {
.val_min = 7000000,
.val_max = 20000000,
.val_stp = 1000000,
.reg_min = 1,
.reg_max = 14,
};
static const struct da9121_range da9121_6A_2phase_current = {
.val_min = 7000000,
.val_max = 12000000,
.val_stp = 1000000,
.reg_min = 1,
.reg_max = 6,
};
static const struct da9121_range da9121_5A_1phase_current = {
.val_min = 3500000,
.val_max = 10000000,
.val_stp = 500000,
.reg_min = 1,
.reg_max = 14,
};
static const struct da9121_range da9121_3A_1phase_current = {
.val_min = 3500000,
.val_max = 6000000,
.val_stp = 500000,
.reg_min = 1,
.reg_max = 6,
};
static const struct da9121_range da914x_40A_4phase_current = {
.val_min = 26000000,
.val_max = 78000000,
.val_stp = 4000000,
.reg_min = 1,
.reg_max = 14,
};
static const struct da9121_range da914x_20A_2phase_current = {
.val_min = 13000000,
.val_max = 39000000,
.val_stp = 2000000,
.reg_min = 1,
.reg_max = 14,
};
struct da9121_variant_info {
int num_bucks;
int num_phases;
const 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
{ 1, 4, &da914x_40A_4phase_current }, //DA9121_TYPE_DA9141
{ 1, 2, &da914x_20A_2phase_current }, //DA9121_TYPE_DA9142
};
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, 0, "Handled E_GPIO2\n"),
};
static int da9121_get_current_limit(struct regulator_dev *rdev)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
const struct da9121_range *range =
variant_parameters[chip->variant_id].current_range;
unsigned int val = 0;
int ret = 0;
ret = regmap_read(chip->regmap, da9121_current_field[id].reg, &val);
if (ret < 0) {
dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
goto error;
}
if (val < range->reg_min) {
ret = -EACCES;
goto error;
}
if (val > range->reg_max) {
ret = -EINVAL;
goto error;
}
return range->val_min + (range->val_stp * (val - range->reg_min));
error:
return ret;
}
static int da9121_ceiling_selector(struct regulator_dev *rdev,
int min, int max,
unsigned int *selector)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
const struct da9121_range *range =
variant_parameters[chip->variant_id].current_range;
unsigned int level;
unsigned int i = 0;
unsigned int sel = 0;
int ret = 0;
if (range->val_min > max || range->val_max < min) {
dev_err(chip->dev,
"Requested current out of regulator capability\n");
ret = -EINVAL;
goto error;
}
level = range->val_max;
for (i = range->reg_max; i >= range->reg_min; i--) {
if (level <= max) {
sel = i;
break;
}
level -= range->val_stp;
}
if (level < min) {
dev_err(chip->dev,
"Best match falls below minimum requested current\n");
ret = -EINVAL;
goto error;
}
*selector = sel;
error:
return ret;
}
static int da9121_set_current_limit(struct regulator_dev *rdev,
int min_ua, int max_ua)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
const struct da9121_range *range =
variant_parameters[chip->variant_id].current_range;
unsigned int sel = 0;
int ret = 0;
if (min_ua < range->val_min ||
max_ua > range->val_max) {
ret = -EINVAL;
goto error;
}
if (rdev->desc->ops->is_enabled(rdev)) {
ret = -EBUSY;
goto error;
}
ret = da9121_ceiling_selector(rdev, min_ua, max_ua, &sel);
if (ret < 0)
goto error;
ret = regmap_update_bits(chip->regmap,
da9121_current_field[id].reg,
da9121_current_field[id].msk,
(unsigned int)sel);
if (ret < 0)
dev_err(chip->dev, "Cannot update BUCK current limit, err: %d\n", ret);
error:
return ret;
}
static unsigned int da9121_map_mode(unsigned int mode)
{
switch (mode) {
case DA9121_BUCK_MODE_FORCE_PWM:
return REGULATOR_MODE_FAST;
case DA9121_BUCK_MODE_FORCE_PWM_SHEDDING:
return REGULATOR_MODE_NORMAL;
case DA9121_BUCK_MODE_AUTO:
return REGULATOR_MODE_IDLE;
case DA9121_BUCK_MODE_FORCE_PFM:
return REGULATOR_MODE_STANDBY;
default:
return REGULATOR_MODE_INVALID;
}
}
static int da9121_buck_set_mode(struct regulator_dev *rdev, unsigned int mode)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
unsigned int val;
switch (mode) {
case REGULATOR_MODE_FAST:
val = DA9121_BUCK_MODE_FORCE_PWM;
break;
case REGULATOR_MODE_NORMAL:
val = DA9121_BUCK_MODE_FORCE_PWM_SHEDDING;
break;
case REGULATOR_MODE_IDLE:
val = DA9121_BUCK_MODE_AUTO;
break;
case REGULATOR_MODE_STANDBY:
val = DA9121_BUCK_MODE_FORCE_PFM;
break;
default:
return -EINVAL;
}
return regmap_update_bits(chip->regmap,
da9121_mode_field[id].reg,
da9121_mode_field[id].msk,
val);
}
static unsigned int da9121_buck_get_mode(struct regulator_dev *rdev)
{
struct da9121 *chip = rdev_get_drvdata(rdev);
int id = rdev_get_id(rdev);
unsigned int val, mode;
int ret = 0;
ret = regmap_read(chip->regmap, da9121_mode_field[id].reg, &val);
if (ret < 0) {
dev_err(chip->dev, "Cannot read BUCK register: %d\n", ret);
return -EINVAL;
}
mode = da9121_map_mode(val & da9121_mode_field[id].msk);
if (mode == REGULATOR_MODE_INVALID)
return -EINVAL;
return mode;
}
static const struct regulator_ops da9121_buck_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.get_current_limit = da9121_get_current_limit,
.set_current_limit = da9121_set_current_limit,
.set_mode = da9121_buck_set_mode,
.get_mode = da9121_buck_get_mode,
};
static struct of_regulator_match da9121_matches[] = {
[DA9121_IDX_BUCK1] = { .name = "buck1" },
[DA9121_IDX_BUCK2] = { .name = "buck2" },
};
static int da9121_of_parse_cb(struct device_node *np,
const struct regulator_desc *desc,
struct regulator_config *config)
{
struct da9121 *chip = config->driver_data;
struct da9121_pdata *pdata;
struct gpio_desc *ena_gpiod;
if (chip->pdata == NULL) {
pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
} else {
pdata = chip->pdata;
}
pdata->num_buck++;
if (pdata->num_buck > variant_parameters[chip->variant_id].num_bucks) {
dev_err(chip->dev, "Error: excessive regulators for device\n");
return -ENODEV;
}
ena_gpiod = fwnode_gpiod_get_index(of_fwnode_handle(np), "enable", 0,
GPIOD_OUT_HIGH |
GPIOD_FLAGS_BIT_NONEXCLUSIVE,
"da9121-enable");
if (!IS_ERR(ena_gpiod))
config->ena_gpiod = ena_gpiod;
if (variant_parameters[chip->variant_id].num_bucks == 2) {
uint32_t ripple_cancel;
uint32_t ripple_reg;
int ret;
if (of_property_read_u32(da9121_matches[pdata->num_buck-1].of_node,
"dlg,ripple-cancel", &ripple_cancel)) {
if (pdata->num_buck > 1)
ripple_reg = DA9xxx_REG_BUCK_BUCK2_7;
else
ripple_reg = DA9121_REG_BUCK_BUCK1_7;
ret = regmap_update_bits(chip->regmap, ripple_reg,
DA9xxx_MASK_BUCK_BUCKx_7_CHx_RIPPLE_CANCEL,
ripple_cancel);
if (ret < 0)
dev_err(chip->dev, "Cannot set ripple mode, err: %d\n", ret);
}
}
return 0;
}
#define DA9121_MIN_MV 300
#define DA9121_MAX_MV 1900
#define DA9121_STEP_MV 10
#define DA9121_MIN_SEL (DA9121_MIN_MV / DA9121_STEP_MV)
#define DA9121_N_VOLTAGES (((DA9121_MAX_MV - DA9121_MIN_MV) / DA9121_STEP_MV) \
+ 1 + DA9121_MIN_SEL)
static const struct regulator_desc da9121_reg = {
.id = DA9121_IDX_BUCK1,
.name = "da9121",
.of_match = "buck1",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
/* Default value of BUCK_BUCK1_0.CH1_SRC_DVC_UP */
.ramp_delay = 20000,
/* tBUCK_EN */
.enable_time = 20,
};
static const struct regulator_desc da9220_reg[2] = {
{
.id = DA9121_IDX_BUCK1,
.name = "DA9220/DA9132 BUCK1",
.of_match = "buck1",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
},
{
.id = DA9121_IDX_BUCK2,
.name = "DA9220/DA9132 BUCK2",
.of_match = "buck2",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
}
};
static const struct regulator_desc da9122_reg[2] = {
{
.id = DA9121_IDX_BUCK1,
.name = "DA9122/DA9131 BUCK1",
.of_match = "buck1",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
},
{
.id = DA9121_IDX_BUCK2,
.name = "DA9122/DA9131 BUCK2",
.of_match = "buck2",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.enable_reg = DA9xxx_REG_BUCK_BUCK2_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
.vsel_reg = DA9xxx_REG_BUCK_BUCK2_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
}
};
static const struct regulator_desc da9217_reg = {
.id = DA9121_IDX_BUCK1,
.name = "DA9217 BUCK1",
.of_match = "buck1",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA9121_N_VOLTAGES,
.min_uV = DA9121_MIN_MV * 1000,
.uV_step = DA9121_STEP_MV * 1000,
.linear_min_sel = DA9121_MIN_SEL,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
};
#define DA914X_MIN_MV 500
#define DA914X_MAX_MV 1300
#define DA914X_STEP_MV 10
#define DA914X_MIN_SEL (DA914X_MIN_MV / DA914X_STEP_MV)
#define DA914X_N_VOLTAGES (((DA914X_MAX_MV - DA914X_MIN_MV) / DA914X_STEP_MV) \
+ 1 + DA914X_MIN_SEL)
static const struct regulator_desc da9141_reg = {
.id = DA9121_IDX_BUCK1,
.name = "DA9141",
.of_match = "buck1",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA914X_N_VOLTAGES,
.min_uV = DA914X_MIN_MV * 1000,
.uV_step = DA914X_STEP_MV * 1000,
.linear_min_sel = DA914X_MIN_SEL,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
};
static const struct regulator_desc da9142_reg = {
.id = DA9121_IDX_BUCK1,
.name = "DA9142 BUCK1",
.of_match = "buck1",
.of_parse_cb = da9121_of_parse_cb,
.owner = THIS_MODULE,
.regulators_node = "regulators",
.of_map_mode = da9121_map_mode,
.ops = &da9121_buck_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = DA914X_N_VOLTAGES,
.min_uV = DA914X_MIN_MV * 1000,
.uV_step = DA914X_STEP_MV * 1000,
.linear_min_sel = DA914X_MIN_SEL,
.enable_reg = DA9121_REG_BUCK_BUCK1_0,
.enable_mask = DA9121_MASK_BUCK_BUCKx_0_CHx_EN,
.vsel_reg = DA9121_REG_BUCK_BUCK1_5,
.vsel_mask = DA9121_MASK_BUCK_BUCKx_5_CHx_A_VOUT,
};
static const struct regulator_desc *local_da9121_regulators[][DA9121_IDX_MAX] = {
[DA9121_TYPE_DA9121_DA9130] = { &da9121_reg, NULL },
[DA9121_TYPE_DA9220_DA9132] = { &da9220_reg[0], &da9220_reg[1] },
[DA9121_TYPE_DA9122_DA9131] = { &da9122_reg[0], &da9122_reg[1] },
[DA9121_TYPE_DA9217] = { &da9217_reg, NULL },
[DA9121_TYPE_DA9141] = { &da9141_reg, NULL },
[DA9121_TYPE_DA9142] = { &da9142_reg, NULL },
};
static void da9121_status_poll_on(struct work_struct *work)
{
struct da9121 *chip = container_of(work, struct da9121, work.work);
int status[3] = {0};
int clear[3] = {0};
unsigned long delay;
int i;
int ret;
ret = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_STATUS_0, status, 2);
if (ret < 0) {
dev_err(chip->dev,
"Failed to read STATUS registers: %d\n", ret);
goto error;
}
/* Possible events are tested to be within range for the variant, potentially
* masked by the IRQ handler (not just warned about), as having been masked,
* and the respective state cleared - then flagged to unmask for next IRQ.
*/
for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
const struct status_event_data *item = &status_event_handling[i];
int reg_idx = item->reg_index;
bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
bool supported = (item->warn == NULL);
bool persisting = (chip->persistent[reg_idx] & item->event_bit);
bool now_cleared = !(status[reg_idx] & item->status_bit);
if (relevant && supported && persisting && now_cleared) {
clear[reg_idx] |= item->mask_bit;
chip->persistent[reg_idx] &= ~item->event_bit;
}
}
for (i = 0; i < 2; i++) {
if (clear[i]) {
unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
unsigned int mbit = clear[i];
ret = regmap_update_bits(chip->regmap, reg, mbit, 0);
if (ret < 0) {
dev_err(chip->dev,
"Failed to unmask 0x%02x %d\n",
reg, ret);
goto error;
}
}
}
if (chip->persistent[0] | chip->persistent[1]) {
delay = msecs_to_jiffies(chip->passive_delay);
queue_delayed_work(system_freezable_wq, &chip->work, delay);
}
error:
return;
}
static irqreturn_t da9121_irq_handler(int irq, void *data)
{
struct da9121 *chip = data;
struct regulator_dev *rdev;
int event[3] = {0};
int handled[3] = {0};
int mask[3] = {0};
int ret = IRQ_NONE;
int i;
int err;
err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_EVENT_0, event, 3);
if (err < 0) {
dev_err(chip->dev, "Failed to read EVENT registers %d\n", err);
ret = IRQ_NONE;
goto error;
}
err = regmap_bulk_read(chip->regmap, DA9121_REG_SYS_MASK_0, mask, 3);
if (err < 0) {
dev_err(chip->dev,
"Failed to read MASK registers: %d\n", ret);
ret = IRQ_NONE;
goto error;
}
rdev = chip->rdev[DA9121_IDX_BUCK1];
/* Possible events are tested to be within range for the variant, currently
* enabled, and having triggered this IRQ. The event may then be notified,
* or a warning given for unexpected events - those from device POR, and
* currently unsupported GPIO configurations.
*/
for (i = 0; i < ARRAY_SIZE(status_event_handling); i++) {
const struct status_event_data *item = &status_event_handling[i];
int reg_idx = item->reg_index;
bool relevant = (item->buck_id <= variant_parameters[chip->variant_id].num_bucks);
bool enabled = !(mask[reg_idx] & item->mask_bit);
bool active = (event[reg_idx] & item->event_bit);
bool notify = (item->warn == NULL);
if (relevant && enabled && active) {
if (notify) {
chip->persistent[reg_idx] |= item->event_bit;
regulator_notifier_call_chain(rdev, item->notification, NULL);
} else {
dev_warn(chip->dev, item->warn);
handled[reg_idx] |= item->event_bit;
ret = IRQ_HANDLED;
}
}
}
for (i = 0; i < 3; i++) {
if (event[i] != handled[i]) {
dev_warn(chip->dev,
"Unhandled event(s) in bank%d 0x%02x\n", i,
event[i] ^ handled[i]);
}
}
/* Mask the interrupts for persistent events OV, OC, UV, WARN, CRIT */
for (i = 0; i < 2; i++) {
if (handled[i]) {
unsigned int reg = DA9121_REG_SYS_MASK_0 + i;
unsigned int mbit = handled[i];
err = regmap_update_bits(chip->regmap, reg, mbit, mbit);
if (err < 0) {
dev_err(chip->dev,
"Failed to mask 0x%02x interrupt %d\n",
reg, err);
ret = IRQ_NONE;
goto error;
}
}
}
/* clear the events */
if (handled[0] | handled[1] | handled[2]) {
err = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_EVENT_0, handled, 3);
if (err < 0) {
dev_err(chip->dev, "Fail to write EVENTs %d\n", err);
ret = IRQ_NONE;
goto error;
}
}
queue_delayed_work(system_freezable_wq, &chip->work, 0);
error:
return ret;
}
static int da9121_set_regulator_config(struct da9121 *chip)
{
struct regulator_config config = { };
unsigned int max_matches = variant_parameters[chip->variant_id].num_bucks;
int ret = 0;
int i;
for (i = 0; i < max_matches; i++) {
const struct regulator_desc *regl_desc =
local_da9121_regulators[chip->variant_id][i];
config.dev = chip->dev;
config.driver_data = chip;
config.regmap = chip->regmap;
chip->rdev[i] = devm_regulator_register(chip->dev,
regl_desc, &config);
if (IS_ERR(chip->rdev[i])) {
dev_err(chip->dev, "Failed to register regulator %s, %d/%d\n",
regl_desc->name, (i+1), max_matches);
ret = PTR_ERR(chip->rdev[i]);
goto error;
}
}
error:
return ret;
}
/* DA9121 chip register model */
static const struct regmap_range da9121_1ch_readable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
};
static const struct regmap_access_table da9121_1ch_readable_table = {
.yes_ranges = da9121_1ch_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_1ch_readable_ranges),
};
static const struct regmap_range da9121_2ch_readable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_7),
regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_7),
regmap_reg_range(DA9121_REG_OTP_DEVICE_ID, DA9121_REG_OTP_CONFIG_ID),
};
static const struct regmap_access_table da9121_2ch_readable_table = {
.yes_ranges = da9121_2ch_readable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_2ch_readable_ranges),
};
static const struct regmap_range da9121_1ch_writeable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_6),
};
static const struct regmap_access_table da9121_1ch_writeable_table = {
.yes_ranges = da9121_1ch_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_1ch_writeable_ranges),
};
static const struct regmap_range da9121_2ch_writeable_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_EVENT_0, DA9121_REG_SYS_MASK_3),
regmap_reg_range(DA9121_REG_SYS_CONFIG_2, DA9121_REG_SYS_CONFIG_3),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_2),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_4, DA9121_REG_BUCK_BUCK1_7),
regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_0, DA9xxx_REG_BUCK_BUCK2_2),
regmap_reg_range(DA9xxx_REG_BUCK_BUCK2_4, DA9xxx_REG_BUCK_BUCK2_7),
};
static const struct regmap_access_table da9121_2ch_writeable_table = {
.yes_ranges = da9121_2ch_writeable_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_2ch_writeable_ranges),
};
static const struct regmap_range da9121_volatile_ranges[] = {
regmap_reg_range(DA9121_REG_SYS_STATUS_0, DA9121_REG_SYS_EVENT_2),
regmap_reg_range(DA9121_REG_SYS_GPIO0_0, DA9121_REG_SYS_GPIO2_1),
regmap_reg_range(DA9121_REG_BUCK_BUCK1_0, DA9121_REG_BUCK_BUCK1_6),
};
static const struct regmap_access_table da9121_volatile_table = {
.yes_ranges = da9121_volatile_ranges,
.n_yes_ranges = ARRAY_SIZE(da9121_volatile_ranges),
};
/* DA9121 regmap config for 1 channel variants */
static const struct regmap_config da9121_1ch_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = DA9121_REG_OTP_CONFIG_ID,
.rd_table = &da9121_1ch_readable_table,
.wr_table = &da9121_1ch_writeable_table,
.volatile_table = &da9121_volatile_table,
.cache_type = REGCACHE_MAPLE,
};
/* DA9121 regmap config for 2 channel variants */
static const struct regmap_config da9121_2ch_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = DA9121_REG_OTP_CONFIG_ID,
.rd_table = &da9121_2ch_readable_table,
.wr_table = &da9121_2ch_writeable_table,
.volatile_table = &da9121_volatile_table,
.cache_type = REGCACHE_MAPLE,
};
static int da9121_check_device_type(struct i2c_client *i2c, struct da9121 *chip)
{
u32 device_id;
u32 variant_id;
u8 variant_mrc, variant_vrc;
char *type;
bool config_match = false;
int ret = 0;
ret = regmap_read(chip->regmap, DA9121_REG_OTP_DEVICE_ID, &device_id);
if (ret < 0) {
dev_err(chip->dev, "Cannot read device ID: %d\n", ret);
goto error;
}
ret = regmap_read(chip->regmap, DA9121_REG_OTP_VARIANT_ID, &variant_id);
if (ret < 0) {
dev_err(chip->dev, "Cannot read variant ID: %d\n", ret);
goto error;
}
if ((device_id != DA9121_DEVICE_ID) && (device_id != DA914x_DEVICE_ID)) {
dev_err(chip->dev, "Invalid device ID: 0x%02x\n", device_id);
ret = -ENODEV;
goto error;
}
variant_vrc = variant_id & DA9121_MASK_OTP_VARIANT_ID_VRC;
switch (chip->subvariant_id) {
case DA9121_SUBTYPE_DA9121:
type = "DA9121";
config_match = (variant_vrc == DA9121_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9130:
type = "DA9130";
config_match = (variant_vrc == DA9130_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9220:
type = "DA9220";
config_match = (variant_vrc == DA9220_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9132:
type = "DA9132";
config_match = (variant_vrc == DA9132_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9122:
type = "DA9122";
config_match = (variant_vrc == DA9122_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9131:
type = "DA9131";
config_match = (variant_vrc == DA9131_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9217:
type = "DA9217";
config_match = (variant_vrc == DA9217_VARIANT_VRC);
break;
default:
type = "Unknown";
break;
}
if (device_id == DA914x_DEVICE_ID) {
switch (chip->subvariant_id) {
case DA9121_SUBTYPE_DA9141:
type = "DA9141";
config_match = (variant_vrc == DA9141_VARIANT_VRC);
break;
case DA9121_SUBTYPE_DA9142:
type = "DA9142";
config_match = (variant_vrc == DA9142_VARIANT_VRC);
break;
default:
type = "Unknown";
break;
}
}
dev_info(chip->dev,
"Device detected (device-ID: 0x%02X, var-ID: 0x%02X, %s)\n",
device_id, variant_id, type);
if (!config_match) {
dev_err(chip->dev, "Device tree configuration does not match detected device.\n");
ret = -EINVAL;
goto error;
}
variant_mrc = (variant_id & DA9121_MASK_OTP_VARIANT_ID_MRC)
>> DA9121_SHIFT_OTP_VARIANT_ID_MRC;
if (((device_id == DA9121_DEVICE_ID) &&
(variant_mrc < DA9121_VARIANT_MRC_BASE)) ||
((device_id == DA914x_DEVICE_ID) &&
(variant_mrc != DA914x_VARIANT_MRC_BASE))) {
dev_err(chip->dev,
"Cannot support variant MRC: 0x%02X\n", variant_mrc);
ret = -EINVAL;
}
error:
return ret;
}
static int da9121_assign_chip_model(struct i2c_client *i2c,
struct da9121 *chip)
{
const struct regmap_config *regmap;
int ret = 0;
chip->dev = &i2c->dev;
/* Use configured subtype to select the regulator descriptor index and
* register map, common to both consumer and automotive grade variants
*/
switch (chip->subvariant_id) {
case DA9121_SUBTYPE_DA9121:
case DA9121_SUBTYPE_DA9130:
chip->variant_id = DA9121_TYPE_DA9121_DA9130;
regmap = &da9121_1ch_regmap_config;
break;
case DA9121_SUBTYPE_DA9217:
chip->variant_id = DA9121_TYPE_DA9217;
regmap = &da9121_1ch_regmap_config;
break;
case DA9121_SUBTYPE_DA9122:
case DA9121_SUBTYPE_DA9131:
chip->variant_id = DA9121_TYPE_DA9122_DA9131;
regmap = &da9121_2ch_regmap_config;
break;
case DA9121_SUBTYPE_DA9220:
case DA9121_SUBTYPE_DA9132:
chip->variant_id = DA9121_TYPE_DA9220_DA9132;
regmap = &da9121_2ch_regmap_config;
break;
case DA9121_SUBTYPE_DA9141:
chip->variant_id = DA9121_TYPE_DA9141;
regmap = &da9121_1ch_regmap_config;
break;
case DA9121_SUBTYPE_DA9142:
chip->variant_id = DA9121_TYPE_DA9142;
regmap = &da9121_2ch_regmap_config;
break;
default:
return -EINVAL;
}
/* Set these up for of_regulator_match call which may want .of_map_modes */
da9121_matches[0].desc = local_da9121_regulators[chip->variant_id][0];
da9121_matches[1].desc = local_da9121_regulators[chip->variant_id][1];
chip->regmap = devm_regmap_init_i2c(i2c, regmap);
if (IS_ERR(chip->regmap)) {
ret = PTR_ERR(chip->regmap);
dev_err(chip->dev, "Failed to configure a register map: %d\n",
ret);
return ret;
}
ret = da9121_check_device_type(i2c, chip);
return ret;
}
static int da9121_config_irq(struct i2c_client *i2c,
struct da9121 *chip)
{
unsigned int p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
const int mask_all[4] = { 0, 0, 0xFF, 0xFF };
int ret = 0;
chip->chip_irq = i2c->irq;
if (chip->chip_irq != 0) {
if (!of_property_read_u32(chip->dev->of_node,
"dlg,irq-polling-delay-passive-ms",
&p_delay)) {
if (p_delay < DA9121_MIN_POLLING_PERIOD_MS ||
p_delay > DA9121_MAX_POLLING_PERIOD_MS) {
dev_warn(chip->dev,
"Out-of-range polling period %d ms\n",
p_delay);
p_delay = DA9121_DEFAULT_POLLING_PERIOD_MS;
}
}
chip->passive_delay = p_delay;
ret = request_threaded_irq(chip->chip_irq, NULL,
da9121_irq_handler,
IRQF_TRIGGER_LOW|IRQF_ONESHOT,
"da9121", chip);
if (ret != 0) {
dev_err(chip->dev, "Failed IRQ request: %d\n",
chip->chip_irq);
goto error;
}
ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
if (ret != 0) {
dev_err(chip->dev, "Failed to set IRQ masks: %d\n",
ret);
goto regmap_error;
}
INIT_DELAYED_WORK(&chip->work, da9121_status_poll_on);
dev_info(chip->dev, "Interrupt polling period set at %d ms\n",
chip->passive_delay);
}
error:
return ret;
regmap_error:
free_irq(chip->chip_irq, chip);
return ret;
}
static const struct of_device_id da9121_dt_ids[] = {
{ .compatible = "dlg,da9121", .data = (void *) DA9121_SUBTYPE_DA9121 },
{ .compatible = "dlg,da9130", .data = (void *) DA9121_SUBTYPE_DA9130 },
{ .compatible = "dlg,da9217", .data = (void *) DA9121_SUBTYPE_DA9217 },
{ .compatible = "dlg,da9122", .data = (void *) DA9121_SUBTYPE_DA9122 },
{ .compatible = "dlg,da9131", .data = (void *) DA9121_SUBTYPE_DA9131 },
{ .compatible = "dlg,da9220", .data = (void *) DA9121_SUBTYPE_DA9220 },
{ .compatible = "dlg,da9132", .data = (void *) DA9121_SUBTYPE_DA9132 },
{ .compatible = "dlg,da9141", .data = (void *) DA9121_SUBTYPE_DA9141 },
{ .compatible = "dlg,da9142", .data = (void *) DA9121_SUBTYPE_DA9142 },
{ }
};
MODULE_DEVICE_TABLE(of, da9121_dt_ids);
static int da9121_i2c_probe(struct i2c_client *i2c)
{
struct da9121 *chip;
const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
int ret = 0;
chip = devm_kzalloc(&i2c->dev, sizeof(struct da9121), GFP_KERNEL);
if (!chip) {
ret = -ENOMEM;
goto error;
}
chip->pdata = i2c->dev.platform_data;
chip->subvariant_id = (enum da9121_subvariant)i2c_get_match_data(i2c);
ret = da9121_assign_chip_model(i2c, chip);
if (ret < 0)
goto error;
ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
if (ret != 0) {
dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
goto error;
}
ret = da9121_set_regulator_config(chip);
if (ret < 0)
goto error;
ret = da9121_config_irq(i2c, chip);
error:
return ret;
}
static void da9121_i2c_remove(struct i2c_client *i2c)
{
struct da9121 *chip = i2c_get_clientdata(i2c);
const int mask_all[4] = { 0xFF, 0xFF, 0xFF, 0xFF };
int ret;
free_irq(chip->chip_irq, chip);
cancel_delayed_work_sync(&chip->work);
ret = regmap_bulk_write(chip->regmap, DA9121_REG_SYS_MASK_0, mask_all, 4);
if (ret != 0)
dev_err(chip->dev, "Failed to set IRQ masks: %d\n", ret);
}
static const struct i2c_device_id da9121_i2c_id[] = {
{"da9121", DA9121_TYPE_DA9121_DA9130},
{"da9130", DA9121_TYPE_DA9121_DA9130},
{"da9217", DA9121_TYPE_DA9217},
{"da9122", DA9121_TYPE_DA9122_DA9131},
{"da9131", DA9121_TYPE_DA9122_DA9131},
{"da9220", DA9121_TYPE_DA9220_DA9132},
{"da9132", DA9121_TYPE_DA9220_DA9132},
{"da9141", DA9121_TYPE_DA9141},
{"da9142", DA9121_TYPE_DA9142},
{},
};
MODULE_DEVICE_TABLE(i2c, da9121_i2c_id);
static struct i2c_driver da9121_regulator_driver = {
.driver = {
.name = "da9121",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.of_match_table = da9121_dt_ids,
},
.probe = da9121_i2c_probe,
.remove = da9121_i2c_remove,
.id_table = da9121_i2c_id,
};
module_i2c_driver(da9121_regulator_driver);
MODULE_DESCRIPTION("Dialog Semiconductor DA9121/DA9122/DA9220/DA9217/DA9130/DA9131/DA9132 regulator driver");
MODULE_LICENSE("GPL v2");
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