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linux/drivers/mfd/tps65219.c
Jerome Neanne 3df4c63675 mfd: tps65219: Add support for soft shutdown via sys-off API 
Use new API for power-off mode support:
Link: https://lwn.net/Articles/894511/
Link: https://lore.kernel.org/all/7hfseqa7l0.fsf@baylibre.com/

sys-off API allows support of shutdown handler and restart handler.

Shutdown was not supported before that enhancement.
This is required for platform that are not using PSCI.

Test:
- restart:
  # reboot
  Default is cold reset:
  # cat /sys/kernel/reboot/mode
  Switch boot mode to warm reset:
  # echo warm > /sys/kernel/reboot/mode
- power-off:
  # halt

Tested on AM62-LP-SK board.

Signed-off-by: Jerome Neanne <jneanne@baylibre.com>
Suggested-by: Andrew Davis <afd@ti.com>
Reviewed-by: Andrew Davis <afd@ti.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230608071947.3467751-1-jneanne@baylibre.com
2023-06-15 09:19:38 +01:00

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// SPDX-License-Identifier: GPL-2.0
//
// Driver for TPS65219 Integrated Power Management Integrated Chips (PMIC)
//
// Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.com/
#include <linux/i2c.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/mfd/core.h>
#include <linux/mfd/tps65219.h>
static int tps65219_warm_reset(struct tps65219 *tps)
{
return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL,
TPS65219_MFP_WARM_RESET_I2C_CTRL_MASK,
TPS65219_MFP_WARM_RESET_I2C_CTRL_MASK);
}
static int tps65219_cold_reset(struct tps65219 *tps)
{
return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL,
TPS65219_MFP_COLD_RESET_I2C_CTRL_MASK,
TPS65219_MFP_COLD_RESET_I2C_CTRL_MASK);
}
static int tps65219_soft_shutdown(struct tps65219 *tps)
{
return regmap_update_bits(tps->regmap, TPS65219_REG_MFP_CTRL,
TPS65219_MFP_I2C_OFF_REQ_MASK,
TPS65219_MFP_I2C_OFF_REQ_MASK);
}
static int tps65219_power_off_handler(struct sys_off_data *data)
{
tps65219_soft_shutdown(data->cb_data);
return NOTIFY_DONE;
}
static int tps65219_restart(struct tps65219 *tps, unsigned long reboot_mode)
{
if (reboot_mode == REBOOT_WARM)
tps65219_warm_reset(tps);
else
tps65219_cold_reset(tps);
return NOTIFY_DONE;
}
static int tps65219_restart_handler(struct sys_off_data *data)
{
tps65219_restart(data->cb_data, data->mode);
return NOTIFY_DONE;
}
static const struct resource tps65219_pwrbutton_resources[] = {
DEFINE_RES_IRQ_NAMED(TPS65219_INT_PB_FALLING_EDGE_DETECT, "falling"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_PB_RISING_EDGE_DETECT, "rising"),
};
static const struct resource tps65219_regulator_resources[] = {
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO3_SCG, "LDO3_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO3_OC, "LDO3_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO3_UV, "LDO3_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO4_SCG, "LDO4_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO4_OC, "LDO4_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO4_UV, "LDO4_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO1_SCG, "LDO1_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO1_OC, "LDO1_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO1_UV, "LDO1_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO2_SCG, "LDO2_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO2_OC, "LDO2_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO2_UV, "LDO2_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK3_SCG, "BUCK3_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK3_OC, "BUCK3_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK3_NEG_OC, "BUCK3_NEG_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK3_UV, "BUCK3_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK1_SCG, "BUCK1_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK1_OC, "BUCK1_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK1_NEG_OC, "BUCK1_NEG_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK1_UV, "BUCK1_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK2_SCG, "BUCK2_SCG"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK2_OC, "BUCK2_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK2_NEG_OC, "BUCK2_NEG_OC"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK2_UV, "BUCK2_UV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK1_RV, "BUCK1_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK2_RV, "BUCK2_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK3_RV, "BUCK3_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO1_RV, "LDO1_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO2_RV, "LDO2_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO3_RV, "LDO3_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO4_RV, "LDO4_RV"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK1_RV_SD, "BUCK1_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK2_RV_SD, "BUCK2_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_BUCK3_RV_SD, "BUCK3_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO1_RV_SD, "LDO1_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO2_RV_SD, "LDO2_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO3_RV_SD, "LDO3_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_LDO4_RV_SD, "LDO4_RV_SD"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_TIMEOUT, "TIMEOUT"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_3_WARM, "SENSOR_3_WARM"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_2_WARM, "SENSOR_2_WARM"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_1_WARM, "SENSOR_1_WARM"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_0_WARM, "SENSOR_0_WARM"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_3_HOT, "SENSOR_3_HOT"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_2_HOT, "SENSOR_2_HOT"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_1_HOT, "SENSOR_1_HOT"),
DEFINE_RES_IRQ_NAMED(TPS65219_INT_SENSOR_0_HOT, "SENSOR_0_HOT"),
};
static const struct mfd_cell tps65219_cells[] = {
{
.name = "tps65219-regulator",
.resources = tps65219_regulator_resources,
.num_resources = ARRAY_SIZE(tps65219_regulator_resources),
},
{ .name = "tps65219-gpio", },
};
static const struct mfd_cell tps65219_pwrbutton_cell = {
.name = "tps65219-pwrbutton",
.resources = tps65219_pwrbutton_resources,
.num_resources = ARRAY_SIZE(tps65219_pwrbutton_resources),
};
static const struct regmap_config tps65219_regmap_config = {
.reg_bits = 8,
.val_bits = 8,
.max_register = TPS65219_REG_FACTORY_CONFIG_2,
};
/*
* Mapping of main IRQ register bits to sub-IRQ register offsets so that we can
* access corect sub-IRQ registers based on bits that are set in main IRQ
* register.
*/
/* Timeout Residual Voltage Shutdown */
static unsigned int bit0_offsets[] = { TPS65219_REG_INT_TO_RV_POS };
static unsigned int bit1_offsets[] = { TPS65219_REG_INT_RV_POS }; /* Residual Voltage */
static unsigned int bit2_offsets[] = { TPS65219_REG_INT_SYS_POS }; /* System */
static unsigned int bit3_offsets[] = { TPS65219_REG_INT_BUCK_1_2_POS }; /* Buck 1-2 */
static unsigned int bit4_offsets[] = { TPS65219_REG_INT_BUCK_3_POS }; /* Buck 3 */
static unsigned int bit5_offsets[] = { TPS65219_REG_INT_LDO_1_2_POS }; /* LDO 1-2 */
static unsigned int bit6_offsets[] = { TPS65219_REG_INT_LDO_3_4_POS }; /* LDO 3-4 */
static unsigned int bit7_offsets[] = { TPS65219_REG_INT_PB_POS }; /* Power Button */
static struct regmap_irq_sub_irq_map tps65219_sub_irq_offsets[] = {
REGMAP_IRQ_MAIN_REG_OFFSET(bit0_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit1_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit2_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit3_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit4_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit5_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit6_offsets),
REGMAP_IRQ_MAIN_REG_OFFSET(bit7_offsets),
};
#define TPS65219_REGMAP_IRQ_REG(int_name, register_position) \
REGMAP_IRQ_REG(int_name, register_position, int_name##_MASK)
static struct regmap_irq tps65219_irqs[] = {
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO3_SCG, TPS65219_REG_INT_LDO_3_4_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO3_OC, TPS65219_REG_INT_LDO_3_4_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO3_UV, TPS65219_REG_INT_LDO_3_4_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO4_SCG, TPS65219_REG_INT_LDO_3_4_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO4_OC, TPS65219_REG_INT_LDO_3_4_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO4_UV, TPS65219_REG_INT_LDO_3_4_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO1_SCG, TPS65219_REG_INT_LDO_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO1_OC, TPS65219_REG_INT_LDO_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO1_UV, TPS65219_REG_INT_LDO_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO2_SCG, TPS65219_REG_INT_LDO_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO2_OC, TPS65219_REG_INT_LDO_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO2_UV, TPS65219_REG_INT_LDO_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK3_SCG, TPS65219_REG_INT_BUCK_3_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK3_OC, TPS65219_REG_INT_BUCK_3_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK3_NEG_OC, TPS65219_REG_INT_BUCK_3_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK3_UV, TPS65219_REG_INT_BUCK_3_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK2_SCG, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK2_OC, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK2_NEG_OC, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK2_UV, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK1_SCG, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK1_OC, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK1_NEG_OC, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK1_UV, TPS65219_REG_INT_BUCK_1_2_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_3_WARM, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_2_WARM, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_1_WARM, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_0_WARM, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_3_HOT, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_2_HOT, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_1_HOT, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_SENSOR_0_HOT, TPS65219_REG_INT_SYS_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK1_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK2_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK3_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO1_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO2_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO3_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO4_RV, TPS65219_REG_INT_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK1_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK2_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_BUCK3_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO1_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO2_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO3_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_LDO4_RV_SD, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_TIMEOUT, TPS65219_REG_INT_TO_RV_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_PB_FALLING_EDGE_DETECT, TPS65219_REG_INT_PB_POS),
TPS65219_REGMAP_IRQ_REG(TPS65219_INT_PB_RISING_EDGE_DETECT, TPS65219_REG_INT_PB_POS),
};
static struct regmap_irq_chip tps65219_irq_chip = {
.name = "tps65219_irq",
.main_status = TPS65219_REG_INT_SOURCE,
.num_main_regs = 1,
.num_main_status_bits = 8,
.irqs = tps65219_irqs,
.num_irqs = ARRAY_SIZE(tps65219_irqs),
.status_base = TPS65219_REG_INT_LDO_3_4,
.ack_base = TPS65219_REG_INT_LDO_3_4,
.clear_ack = 1,
.num_regs = 8,
.sub_reg_offsets = tps65219_sub_irq_offsets,
};
static int tps65219_probe(struct i2c_client *client)
{
struct tps65219 *tps;
unsigned int chipid;
bool pwr_button;
int ret;
tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
if (!tps)
return -ENOMEM;
i2c_set_clientdata(client, tps);
tps->dev = &client->dev;
tps->regmap = devm_regmap_init_i2c(client, &tps65219_regmap_config);
if (IS_ERR(tps->regmap)) {
ret = PTR_ERR(tps->regmap);
dev_err(tps->dev, "Failed to allocate register map: %d\n", ret);
return ret;
}
ret = devm_regmap_add_irq_chip(&client->dev, tps->regmap, client->irq,
IRQF_ONESHOT, 0, &tps65219_irq_chip,
&tps->irq_data);
if (ret)
return ret;
ret = regmap_read(tps->regmap, TPS65219_REG_TI_DEV_ID, &chipid);
if (ret) {
dev_err(tps->dev, "Failed to read device ID: %d\n", ret);
return ret;
}
ret = devm_mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO,
tps65219_cells, ARRAY_SIZE(tps65219_cells),
NULL, 0, regmap_irq_get_domain(tps->irq_data));
if (ret) {
dev_err(tps->dev, "Failed to add child devices: %d\n", ret);
return ret;
}
pwr_button = of_property_read_bool(tps->dev->of_node, "ti,power-button");
if (pwr_button) {
ret = devm_mfd_add_devices(tps->dev, PLATFORM_DEVID_AUTO,
&tps65219_pwrbutton_cell, 1, NULL, 0,
regmap_irq_get_domain(tps->irq_data));
if (ret) {
dev_err(tps->dev, "Failed to add power-button: %d\n", ret);
return ret;
}
}
ret = devm_register_restart_handler(tps->dev,
tps65219_restart_handler,
tps);
if (ret) {
dev_err(tps->dev, "cannot register restart handler, %d\n", ret);
return ret;
}
ret = devm_register_power_off_handler(tps->dev,
tps65219_power_off_handler,
tps);
if (ret) {
dev_err(tps->dev, "failed to register power-off handler: %d\n", ret);
return ret;
}
return 0;
}
static const struct of_device_id of_tps65219_match_table[] = {
{ .compatible = "ti,tps65219", },
{}
};
MODULE_DEVICE_TABLE(of, of_tps65219_match_table);
static struct i2c_driver tps65219_driver = {
.driver = {
.name = "tps65219",
.of_match_table = of_tps65219_match_table,
},
.probe = tps65219_probe,
};
module_i2c_driver(tps65219_driver);
MODULE_AUTHOR("Jerome Neanne <jneanne@baylibre.com>");
MODULE_DESCRIPTION("TPS65219 power management IC driver");
MODULE_LICENSE("GPL");
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