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linux-next/drivers/regulator/bd96801-regulator.c
Matti Vaittinen a8d77166fc
regulator: bd96801: Add ERRB IRQ 
The ROHM BD96801 "scalable PMIC" provides two physical IRQs. The ERRB
handling can in many cases be omitted because it is used to inform fatal
IRQs, which usually kill the power from the SOC.

There may however be use-cases where the SOC has a 'back-up' emergency
power source which allows some very short time of operation to try to
gracefully shut down sensitive hardware. Furthermore, it is possible the
processor controlling the PMIC is not powered by the PMIC. In such cases
handling the ERRB IRQs may be beneficial.

Add support for ERRB IRQs.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://patch.msgid.link/ZzWkny4lKpY09SX5@mva-rohm
Signed-off-by: Mark Brown <broonie@kernel.org>
2024-12-02 00:31:31 +00:00

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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2024 ROHM Semiconductors
// bd96801-regulator.c ROHM BD96801 regulator driver
/*
* This version of the "BD86801 scalable PMIC"'s driver supports only very
* basic set of the PMIC features. Most notably, there is no support for
* the configurations which should be done when the PMIC is in STBY mode.
*
* Being able to reliably do the configurations like changing the
* regulator safety limits (like limits for the over/under -voltages, over
* current, thermal protection) would require the configuring driver to be
* synchronized with entity causing the PMIC state transitions. Eg, one
* should be able to ensure the PMIC is in STBY state when the
* configurations are applied to the hardware. How and when the PMIC state
* transitions are to be done is likely to be very system specific, as will
* be the need to configure these safety limits. Hence it's not simple to
* come up with a generic solution.
*
* Users who require the STBY state configurations can have a look at the
* original RFC:
* https://lore.kernel.org/all/cover.1712920132.git.mazziesaccount@gmail.com/
* which implements some of the safety limit configurations - but leaves the
* state change handling and synchronization to be implemented.
*
* It would be great to hear (and receive a patch!) if you implement the
* STBY configuration support in your downstream driver ;)
*/
#include <linux/cleanup.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/linear_range.h>
#include <linux/mfd/rohm-generic.h>
#include <linux/mfd/rohm-bd96801.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/coupler.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/slab.h>
#include <linux/timer.h>
enum {
BD96801_BUCK1,
BD96801_BUCK2,
BD96801_BUCK3,
BD96801_BUCK4,
BD96801_LDO5,
BD96801_LDO6,
BD96801_LDO7,
BD96801_REGULATOR_AMOUNT,
};
enum {
BD96801_PROT_OVP,
BD96801_PROT_UVP,
BD96801_PROT_OCP,
BD96801_PROT_TEMP,
BD96801_NUM_PROT,
};
#define BD96801_ALWAYS_ON_REG 0x3c
#define BD96801_REG_ENABLE 0x0b
#define BD96801_BUCK1_EN_MASK BIT(0)
#define BD96801_BUCK2_EN_MASK BIT(1)
#define BD96801_BUCK3_EN_MASK BIT(2)
#define BD96801_BUCK4_EN_MASK BIT(3)
#define BD96801_LDO5_EN_MASK BIT(4)
#define BD96801_LDO6_EN_MASK BIT(5)
#define BD96801_LDO7_EN_MASK BIT(6)
#define BD96801_BUCK1_VSEL_REG 0x28
#define BD96801_BUCK2_VSEL_REG 0x29
#define BD96801_BUCK3_VSEL_REG 0x2a
#define BD96801_BUCK4_VSEL_REG 0x2b
#define BD96801_LDO5_VSEL_REG 0x25
#define BD96801_LDO6_VSEL_REG 0x26
#define BD96801_LDO7_VSEL_REG 0x27
#define BD96801_BUCK_VSEL_MASK 0x1F
#define BD96801_LDO_VSEL_MASK 0xff
#define BD96801_MASK_RAMP_DELAY 0xc0
#define BD96801_INT_VOUT_BASE_REG 0x21
#define BD96801_BUCK_INT_VOUT_MASK 0xff
#define BD96801_BUCK_VOLTS 256
#define BD96801_LDO_VOLTS 256
#define BD96801_OVP_MASK 0x03
#define BD96801_MASK_BUCK1_OVP_SHIFT 0x00
#define BD96801_MASK_BUCK2_OVP_SHIFT 0x02
#define BD96801_MASK_BUCK3_OVP_SHIFT 0x04
#define BD96801_MASK_BUCK4_OVP_SHIFT 0x06
#define BD96801_MASK_LDO5_OVP_SHIFT 0x00
#define BD96801_MASK_LDO6_OVP_SHIFT 0x02
#define BD96801_MASK_LDO7_OVP_SHIFT 0x04
#define BD96801_PROT_LIMIT_OCP_MIN 0x00
#define BD96801_PROT_LIMIT_LOW 0x01
#define BD96801_PROT_LIMIT_MID 0x02
#define BD96801_PROT_LIMIT_HI 0x03
#define BD96801_REG_BUCK1_OCP 0x32
#define BD96801_REG_BUCK2_OCP 0x32
#define BD96801_REG_BUCK3_OCP 0x33
#define BD96801_REG_BUCK4_OCP 0x33
#define BD96801_MASK_BUCK1_OCP_SHIFT 0x00
#define BD96801_MASK_BUCK2_OCP_SHIFT 0x04
#define BD96801_MASK_BUCK3_OCP_SHIFT 0x00
#define BD96801_MASK_BUCK4_OCP_SHIFT 0x04
#define BD96801_REG_LDO5_OCP 0x34
#define BD96801_REG_LDO6_OCP 0x34
#define BD96801_REG_LDO7_OCP 0x34
#define BD96801_MASK_LDO5_OCP_SHIFT 0x00
#define BD96801_MASK_LDO6_OCP_SHIFT 0x02
#define BD96801_MASK_LDO7_OCP_SHIFT 0x04
#define BD96801_MASK_SHD_INTB BIT(7)
#define BD96801_INTB_FATAL BIT(7)
#define BD96801_NUM_REGULATORS 7
#define BD96801_NUM_LDOS 4
/*
* Ramp rates for bucks are controlled by bits [7:6] as follows:
* 00 => 1 mV/uS
* 01 => 5 mV/uS
* 10 => 10 mV/uS
* 11 => 20 mV/uS
*/
static const unsigned int buck_ramp_table[] = { 1000, 5000, 10000, 20000 };
/*
* This is a voltage range that get's appended to selected
* bd96801_buck_init_volts value. The range from 0x0 to 0xF is actually
* bd96801_buck_init_volts + 0 ... bd96801_buck_init_volts + 150mV
* and the range from 0x10 to 0x1f is bd96801_buck_init_volts - 150mV ...
* bd96801_buck_init_volts - 0. But as the members of linear_range
* are all unsigned I will apply offset of -150 mV to value in
* linear_range - which should increase these ranges with
* 150 mV getting all the values to >= 0.
*/
static const struct linear_range bd96801_tune_volts[] = {
REGULATOR_LINEAR_RANGE(150000, 0x00, 0xF, 10000),
REGULATOR_LINEAR_RANGE(0, 0x10, 0x1F, 10000),
};
static const struct linear_range bd96801_buck_init_volts[] = {
REGULATOR_LINEAR_RANGE(500000 - 150000, 0x00, 0xc8, 5000),
REGULATOR_LINEAR_RANGE(1550000 - 150000, 0xc9, 0xec, 50000),
REGULATOR_LINEAR_RANGE(3300000 - 150000, 0xed, 0xff, 0),
};
static const struct linear_range bd96801_ldo_int_volts[] = {
REGULATOR_LINEAR_RANGE(300000, 0x00, 0x78, 25000),
REGULATOR_LINEAR_RANGE(3300000, 0x79, 0xff, 0),
};
#define BD96801_LDO_SD_VOLT_MASK 0x1
#define BD96801_LDO_MODE_MASK 0x6
#define BD96801_LDO_MODE_INT 0x0
#define BD96801_LDO_MODE_SD 0x2
#define BD96801_LDO_MODE_DDR 0x4
static int ldo_ddr_volt_table[] = {500000, 300000};
static int ldo_sd_volt_table[] = {3300000, 1800000};
/* Constant IRQ initialization data (templates) */
struct bd96801_irqinfo {
int type;
struct regulator_irq_desc irq_desc;
int err_cfg;
int wrn_cfg;
const char *irq_name;
};
#define BD96801_IRQINFO(_type, _name, _irqoff_ms, _irqname) \
{ \
.type = (_type), \
.err_cfg = -1, \
.wrn_cfg = -1, \
.irq_name = (_irqname), \
.irq_desc = { \
.name = (_name), \
.irq_off_ms = (_irqoff_ms), \
.map_event = regulator_irq_map_event_simple, \
}, \
}
static const struct bd96801_irqinfo buck1_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-h", 500,
"bd96801-buck1-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-l", 500,
"bd96801-buck1-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck1-over-curr-n", 500,
"bd96801-buck1-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck1-over-voltage", 500,
"bd96801-buck1-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck1-under-voltage", 500,
"bd96801-buck1-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck1-over-temp", 500,
"bd96801-buck1-thermal")
};
static const struct bd96801_irqinfo buck2_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-h", 500,
"bd96801-buck2-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-l", 500,
"bd96801-buck2-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck2-over-curr-n", 500,
"bd96801-buck2-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck2-over-voltage", 500,
"bd96801-buck2-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck2-under-voltage", 500,
"bd96801-buck2-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck2-over-temp", 500,
"bd96801-buck2-thermal")
};
static const struct bd96801_irqinfo buck3_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-h", 500,
"bd96801-buck3-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-l", 500,
"bd96801-buck3-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck3-over-curr-n", 500,
"bd96801-buck3-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck3-over-voltage", 500,
"bd96801-buck3-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck3-under-voltage", 500,
"bd96801-buck3-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck3-over-temp", 500,
"bd96801-buck3-thermal")
};
static const struct bd96801_irqinfo buck4_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-h", 500,
"bd96801-buck4-overcurr-h"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-l", 500,
"bd96801-buck4-overcurr-l"),
BD96801_IRQINFO(BD96801_PROT_OCP, "buck4-over-curr-n", 500,
"bd96801-buck4-overcurr-n"),
BD96801_IRQINFO(BD96801_PROT_OVP, "buck4-over-voltage", 500,
"bd96801-buck4-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "buck4-under-voltage", 500,
"bd96801-buck4-undervolt"),
BD96801_IRQINFO(BD96801_PROT_TEMP, "buck4-over-temp", 500,
"bd96801-buck4-thermal")
};
static const struct bd96801_irqinfo ldo5_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "ldo5-overcurr", 500,
"bd96801-ldo5-overcurr"),
BD96801_IRQINFO(BD96801_PROT_OVP, "ldo5-over-voltage", 500,
"bd96801-ldo5-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "ldo5-under-voltage", 500,
"bd96801-ldo5-undervolt"),
};
static const struct bd96801_irqinfo ldo6_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "ldo6-overcurr", 500,
"bd96801-ldo6-overcurr"),
BD96801_IRQINFO(BD96801_PROT_OVP, "ldo6-over-voltage", 500,
"bd96801-ldo6-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "ldo6-under-voltage", 500,
"bd96801-ldo6-undervolt"),
};
static const struct bd96801_irqinfo ldo7_irqinfo[] = {
BD96801_IRQINFO(BD96801_PROT_OCP, "ldo7-overcurr", 500,
"bd96801-ldo7-overcurr"),
BD96801_IRQINFO(BD96801_PROT_OVP, "ldo7-over-voltage", 500,
"bd96801-ldo7-overvolt"),
BD96801_IRQINFO(BD96801_PROT_UVP, "ldo7-under-voltage", 500,
"bd96801-ldo7-undervolt"),
};
struct bd96801_irq_desc {
struct bd96801_irqinfo *irqinfo;
int num_irqs;
};
struct bd96801_regulator_data {
struct regulator_desc desc;
const struct linear_range *init_ranges;
int num_ranges;
struct bd96801_irq_desc irq_desc;
int initial_voltage;
int ldo_vol_lvl;
int ldo_errs;
};
struct bd96801_pmic_data {
struct bd96801_regulator_data regulator_data[BD96801_NUM_REGULATORS];
struct regmap *regmap;
int fatal_ind;
};
static int ldo_map_notif(int irq, struct regulator_irq_data *rid,
unsigned long *dev_mask)
{
int i;
for (i = 0; i < rid->num_states; i++) {
struct bd96801_regulator_data *rdata;
struct regulator_dev *rdev;
rdev = rid->states[i].rdev;
rdata = container_of(rdev->desc, struct bd96801_regulator_data,
desc);
rid->states[i].notifs = regulator_err2notif(rdata->ldo_errs);
rid->states[i].errors = rdata->ldo_errs;
*dev_mask |= BIT(i);
}
return 0;
}
static int bd96801_list_voltage_lr(struct regulator_dev *rdev,
unsigned int selector)
{
int voltage;
struct bd96801_regulator_data *data;
data = container_of(rdev->desc, struct bd96801_regulator_data, desc);
/*
* The BD096801 has voltage setting in two registers. One giving the
* "initial voltage" (can be changed only when regulator is disabled.
* This driver caches the value and sets it only at startup. The other
* register is voltage tuning value which applies -150 mV ... +150 mV
* offset to the voltage.
*
* Note that the cached initial voltage stored in regulator data is
* 'scaled down' by the 150 mV so that all of our tuning values are
* >= 0. This is done because the linear_ranges uses unsigned values.
*
* As a result, we increase the tuning voltage which we get based on
* the selector by the stored initial_voltage.
*/
voltage = regulator_list_voltage_linear_range(rdev, selector);
if (voltage < 0)
return voltage;
return voltage + data->initial_voltage;
}
static const struct regulator_ops bd96801_ldo_table_ops = {
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_table,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static const struct regulator_ops bd96801_buck_ops = {
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = bd96801_list_voltage_lr,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_time_sel = regulator_set_voltage_time_sel,
.set_ramp_delay = regulator_set_ramp_delay_regmap,
};
static const struct regulator_ops bd96801_ldo_ops = {
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
};
static int buck_get_initial_voltage(struct regmap *regmap, struct device *dev,
struct bd96801_regulator_data *data)
{
int ret = 0, sel, initial_uv;
int reg = BD96801_INT_VOUT_BASE_REG + data->desc.id;
if (data->num_ranges) {
ret = regmap_read(regmap, reg, &sel);
sel &= BD96801_BUCK_INT_VOUT_MASK;
ret = linear_range_get_value_array(data->init_ranges,
data->num_ranges, sel,
&initial_uv);
if (ret)
return ret;
data->initial_voltage = initial_uv;
dev_dbg(dev, "Tune-scaled initial voltage %u\n",
data->initial_voltage);
}
return 0;
}
static int get_ldo_initial_voltage(struct regmap *regmap,
struct device *dev,
struct bd96801_regulator_data *data)
{
int ret;
int cfgreg;
ret = regmap_read(regmap, data->ldo_vol_lvl, &cfgreg);
if (ret)
return ret;
switch (cfgreg & BD96801_LDO_MODE_MASK) {
case BD96801_LDO_MODE_DDR:
data->desc.volt_table = ldo_ddr_volt_table;
data->desc.n_voltages = ARRAY_SIZE(ldo_ddr_volt_table);
break;
case BD96801_LDO_MODE_SD:
data->desc.volt_table = ldo_sd_volt_table;
data->desc.n_voltages = ARRAY_SIZE(ldo_sd_volt_table);
break;
default:
dev_info(dev, "Leaving LDO to normal mode");
return 0;
}
/* SD or DDR mode => override default ops */
data->desc.ops = &bd96801_ldo_table_ops,
data->desc.vsel_mask = 1;
data->desc.vsel_reg = data->ldo_vol_lvl;
return 0;
}
static int get_initial_voltage(struct device *dev, struct regmap *regmap,
struct bd96801_regulator_data *data)
{
/* BUCK */
if (data->desc.id <= BD96801_BUCK4)
return buck_get_initial_voltage(regmap, dev, data);
/* LDO */
return get_ldo_initial_voltage(regmap, dev, data);
}
static int bd96801_walk_regulator_dt(struct device *dev, struct regmap *regmap,
struct bd96801_regulator_data *data,
int num)
{
int i, ret;
struct device_node *nproot __free(device_node) =
of_get_child_by_name(dev->parent->of_node, "regulators");
if (!nproot) {
dev_err(dev, "failed to find regulators node\n");
return -ENODEV;
}
for_each_child_of_node_scoped(nproot, np) {
for (i = 0; i < num; i++) {
if (!of_node_name_eq(np, data[i].desc.of_match))
continue;
/*
* If STBY configs are supported, we must pass node
* here to extract the initial voltages from the DT.
* Thus we do the initial voltage getting in this
* loop.
*/
ret = get_initial_voltage(dev, regmap, &data[i]);
if (ret) {
dev_err(dev,
"Initializing voltages for %s failed\n",
data[i].desc.name);
return ret;
}
if (of_property_read_bool(np, "rohm,keep-on-stby")) {
ret = regmap_set_bits(regmap,
BD96801_ALWAYS_ON_REG,
1 << data[i].desc.id);
if (ret) {
dev_err(dev,
"failed to set %s on-at-stby\n",
data[i].desc.name);
return ret;
}
}
}
}
return 0;
}
/*
* Template for regulator data. Probe will allocate dynamic / driver instance
* struct so we should be on a safe side even if there were multiple PMICs to
* control. Note that there is a plan to allow multiple PMICs to be used so
* systems can scale better. I am however still slightly unsure how the
* multi-PMIC case will be handled. I don't know if the processor will have I2C
* acces to all of the PMICs or only the first one. I'd guess there will be
* access provided to all PMICs for voltage scaling - but the errors will only
* be informed via the master PMIC. Eg, we should prepare to support multiple
* driver instances - either with or without the IRQs... Well, let's first
* just support the simple and clear single-PMIC setup and ponder the multi PMIC
* case later. What we can easly do for preparing is to not use static global
* data for regulators though.
*/
static const struct bd96801_pmic_data bd96801_data = {
.regulator_data = {
{
.desc = {
.name = "buck1",
.of_match = of_match_ptr("buck1"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK1,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK1_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK1_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK1_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck1_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck1_irqinfo),
},
}, {
.desc = {
.name = "buck2",
.of_match = of_match_ptr("buck2"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK2,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK2_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK2_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK2_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck2_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck2_irqinfo),
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
}, {
.desc = {
.name = "buck3",
.of_match = of_match_ptr("buck3"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK3,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK3_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK3_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK3_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck3_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck3_irqinfo),
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
}, {
.desc = {
.name = "buck4",
.of_match = of_match_ptr("buck4"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_BUCK4,
.ops = &bd96801_buck_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_tune_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_tune_volts),
.n_voltages = BD96801_BUCK_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_BUCK4_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_BUCK4_VSEL_REG,
.vsel_mask = BD96801_BUCK_VSEL_MASK,
.ramp_reg = BD96801_BUCK4_VSEL_REG,
.ramp_mask = BD96801_MASK_RAMP_DELAY,
.ramp_delay_table = &buck_ramp_table[0],
.n_ramp_values = ARRAY_SIZE(buck_ramp_table),
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&buck4_irqinfo[0],
.num_irqs = ARRAY_SIZE(buck4_irqinfo),
},
.init_ranges = bd96801_buck_init_volts,
.num_ranges = ARRAY_SIZE(bd96801_buck_init_volts),
}, {
.desc = {
.name = "ldo5",
.of_match = of_match_ptr("ldo5"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_LDO5,
.ops = &bd96801_ldo_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_ldo_int_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
.n_voltages = BD96801_LDO_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_LDO5_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_LDO5_VSEL_REG,
.vsel_mask = BD96801_LDO_VSEL_MASK,
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&ldo5_irqinfo[0],
.num_irqs = ARRAY_SIZE(ldo5_irqinfo),
},
.ldo_vol_lvl = BD96801_LDO5_VOL_LVL_REG,
}, {
.desc = {
.name = "ldo6",
.of_match = of_match_ptr("ldo6"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_LDO6,
.ops = &bd96801_ldo_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_ldo_int_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
.n_voltages = BD96801_LDO_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_LDO6_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_LDO6_VSEL_REG,
.vsel_mask = BD96801_LDO_VSEL_MASK,
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&ldo6_irqinfo[0],
.num_irqs = ARRAY_SIZE(ldo6_irqinfo),
},
.ldo_vol_lvl = BD96801_LDO6_VOL_LVL_REG,
}, {
.desc = {
.name = "ldo7",
.of_match = of_match_ptr("ldo7"),
.regulators_node = of_match_ptr("regulators"),
.id = BD96801_LDO7,
.ops = &bd96801_ldo_ops,
.type = REGULATOR_VOLTAGE,
.linear_ranges = bd96801_ldo_int_volts,
.n_linear_ranges = ARRAY_SIZE(bd96801_ldo_int_volts),
.n_voltages = BD96801_LDO_VOLTS,
.enable_reg = BD96801_REG_ENABLE,
.enable_mask = BD96801_LDO7_EN_MASK,
.enable_is_inverted = true,
.vsel_reg = BD96801_LDO7_VSEL_REG,
.vsel_mask = BD96801_LDO_VSEL_MASK,
.owner = THIS_MODULE,
},
.irq_desc = {
.irqinfo = (struct bd96801_irqinfo *)&ldo7_irqinfo[0],
.num_irqs = ARRAY_SIZE(ldo7_irqinfo),
},
.ldo_vol_lvl = BD96801_LDO7_VOL_LVL_REG,
},
},
};
static int initialize_pmic_data(struct device *dev,
struct bd96801_pmic_data *pdata)
{
int r, i;
/*
* Allocate and initialize IRQ data for all of the regulators. We
* wish to modify IRQ information independently for each driver
* instance.
*/
for (r = 0; r < BD96801_NUM_REGULATORS; r++) {
const struct bd96801_irqinfo *template;
struct bd96801_irqinfo *new;
int num_infos;
template = pdata->regulator_data[r].irq_desc.irqinfo;
num_infos = pdata->regulator_data[r].irq_desc.num_irqs;
new = devm_kcalloc(dev, num_infos, sizeof(*new), GFP_KERNEL);
if (!new)
return -ENOMEM;
pdata->regulator_data[r].irq_desc.irqinfo = new;
for (i = 0; i < num_infos; i++)
new[i] = template[i];
}
return 0;
}
static int bd96801_map_event_all(int irq, struct regulator_irq_data *rid,
unsigned long *dev_mask)
{
int i;
for (i = 0; i < rid->num_states; i++) {
rid->states[i].notifs = REGULATOR_EVENT_FAIL;
rid->states[i].errors = REGULATOR_ERROR_FAIL;
*dev_mask |= BIT(i);
}
return 0;
}
static int bd96801_rdev_errb_irqs(struct platform_device *pdev,
struct regulator_dev *rdev)
{
int i;
void *retp;
static const char * const single_out_errb_irqs[] = {
"bd96801-%s-pvin-err", "bd96801-%s-ovp-err",
"bd96801-%s-uvp-err", "bd96801-%s-shdn-err",
};
for (i = 0; i < ARRAY_SIZE(single_out_errb_irqs); i++) {
struct regulator_irq_desc id = {
.map_event = bd96801_map_event_all,
.irq_off_ms = 1000,
};
struct regulator_dev *rdev_arr[1];
char tmp[255];
int irq;
snprintf(tmp, 255, single_out_errb_irqs[i], rdev->desc->name);
tmp[254] = 0;
id.name = tmp;
irq = platform_get_irq_byname(pdev, tmp);
if (irq < 0)
continue;
rdev_arr[0] = rdev;
retp = devm_regulator_irq_helper(&pdev->dev, &id, irq, 0,
REGULATOR_ERROR_FAIL, NULL,
rdev_arr, 1);
if (IS_ERR(retp))
return PTR_ERR(retp);
}
return 0;
}
static int bd96801_global_errb_irqs(struct platform_device *pdev,
struct regulator_dev **rdev, int num_rdev)
{
int i, num_irqs;
void *retp;
static const char * const global_errb_irqs[] = {
"bd96801-otp-err", "bd96801-dbist-err", "bd96801-eep-err",
"bd96801-abist-err", "bd96801-prstb-err", "bd96801-drmoserr1",
"bd96801-drmoserr2", "bd96801-slave-err", "bd96801-vref-err",
"bd96801-tsd", "bd96801-uvlo-err", "bd96801-ovlo-err",
"bd96801-osc-err", "bd96801-pon-err", "bd96801-poff-err",
"bd96801-cmd-shdn-err", "bd96801-int-shdn-err"
};
num_irqs = ARRAY_SIZE(global_errb_irqs);
for (i = 0; i < num_irqs; i++) {
int irq;
struct regulator_irq_desc id = {
.name = global_errb_irqs[i],
.map_event = bd96801_map_event_all,
.irq_off_ms = 1000,
};
irq = platform_get_irq_byname(pdev, global_errb_irqs[i]);
if (irq < 0)
continue;
retp = devm_regulator_irq_helper(&pdev->dev, &id, irq, 0,
REGULATOR_ERROR_FAIL, NULL,
rdev, num_rdev);
if (IS_ERR(retp))
return PTR_ERR(retp);
}
return 0;
}
static int bd96801_rdev_intb_irqs(struct platform_device *pdev,
struct bd96801_pmic_data *pdata,
struct bd96801_irqinfo *iinfo,
struct regulator_dev *rdev)
{
struct regulator_dev *rdev_arr[1];
void *retp;
int err = 0;
int irq;
int err_flags[] = {
[BD96801_PROT_OVP] = REGULATOR_ERROR_REGULATION_OUT,
[BD96801_PROT_UVP] = REGULATOR_ERROR_UNDER_VOLTAGE,
[BD96801_PROT_OCP] = REGULATOR_ERROR_OVER_CURRENT,
[BD96801_PROT_TEMP] = REGULATOR_ERROR_OVER_TEMP,
};
int wrn_flags[] = {
[BD96801_PROT_OVP] = REGULATOR_ERROR_OVER_VOLTAGE_WARN,
[BD96801_PROT_UVP] = REGULATOR_ERROR_UNDER_VOLTAGE_WARN,
[BD96801_PROT_OCP] = REGULATOR_ERROR_OVER_CURRENT_WARN,
[BD96801_PROT_TEMP] = REGULATOR_ERROR_OVER_TEMP_WARN,
};
/*
* Don't install IRQ handler if both error and warning
* notifications are explicitly disabled
*/
if (!iinfo->err_cfg && !iinfo->wrn_cfg)
return 0;
if (WARN_ON(iinfo->type >= BD96801_NUM_PROT))
return -EINVAL;
if (iinfo->err_cfg)
err = err_flags[iinfo->type];
else if (iinfo->wrn_cfg)
err = wrn_flags[iinfo->type];
iinfo->irq_desc.data = pdata;
irq = platform_get_irq_byname(pdev, iinfo->irq_name);
if (irq < 0)
return irq;
/* Find notifications for this IRQ (WARN/ERR) */
rdev_arr[0] = rdev;
retp = devm_regulator_irq_helper(&pdev->dev,
&iinfo->irq_desc, irq,
0, err, NULL, rdev_arr,
1);
if (IS_ERR(retp))
return PTR_ERR(retp);
return 0;
}
static int bd96801_probe(struct platform_device *pdev)
{
struct regulator_dev *ldo_errs_rdev_arr[BD96801_NUM_LDOS];
struct regulator_dev *all_rdevs[BD96801_NUM_REGULATORS];
struct bd96801_regulator_data *rdesc;
struct regulator_config config = {};
int ldo_errs_arr[BD96801_NUM_LDOS];
struct bd96801_pmic_data *pdata;
int temp_notif_ldos = 0;
struct device *parent;
int i, ret;
bool use_errb;
void *retp;
parent = pdev->dev.parent;
pdata = devm_kmemdup(&pdev->dev, &bd96801_data, sizeof(bd96801_data),
GFP_KERNEL);
if (!pdata)
return -ENOMEM;
if (initialize_pmic_data(&pdev->dev, pdata))
return -ENOMEM;
pdata->regmap = dev_get_regmap(parent, NULL);
if (!pdata->regmap) {
dev_err(&pdev->dev, "No register map found\n");
return -ENODEV;
}
rdesc = &pdata->regulator_data[0];
config.driver_data = pdata;
config.regmap = pdata->regmap;
config.dev = parent;
ret = of_property_match_string(pdev->dev.parent->of_node,
"interrupt-names", "errb");
if (ret < 0)
use_errb = false;
else
use_errb = true;
ret = bd96801_walk_regulator_dt(&pdev->dev, pdata->regmap, rdesc,
BD96801_NUM_REGULATORS);
if (ret)
return ret;
for (i = 0; i < ARRAY_SIZE(pdata->regulator_data); i++) {
struct regulator_dev *rdev;
struct bd96801_irq_desc *idesc = &rdesc[i].irq_desc;
int j;
rdev = devm_regulator_register(&pdev->dev,
&rdesc[i].desc, &config);
if (IS_ERR(rdev)) {
dev_err(&pdev->dev,
"failed to register %s regulator\n",
rdesc[i].desc.name);
return PTR_ERR(rdev);
}
all_rdevs[i] = rdev;
/*
* LDOs don't have own temperature monitoring. If temperature
* notification was requested for this LDO from DT then we will
* add the regulator to be notified if central IC temperature
* exceeds threshold.
*/
if (rdesc[i].ldo_errs) {
ldo_errs_rdev_arr[temp_notif_ldos] = rdev;
ldo_errs_arr[temp_notif_ldos] = rdesc[i].ldo_errs;
temp_notif_ldos++;
}
/* Register INTB handlers for configured protections */
for (j = 0; j < idesc->num_irqs; j++) {
ret = bd96801_rdev_intb_irqs(pdev, pdata,
&idesc->irqinfo[j], rdev);
if (ret)
return ret;
}
/* Register per regulator ERRB notifiers */
if (use_errb) {
ret = bd96801_rdev_errb_irqs(pdev, rdev);
if (ret)
return ret;
}
}
if (temp_notif_ldos) {
int irq;
struct regulator_irq_desc tw_desc = {
.name = "bd96801-core-thermal",
.irq_off_ms = 500,
.map_event = ldo_map_notif,
};
irq = platform_get_irq_byname(pdev, "bd96801-core-thermal");
if (irq < 0)
return irq;
retp = devm_regulator_irq_helper(&pdev->dev, &tw_desc, irq, 0,
0, &ldo_errs_arr[0],
&ldo_errs_rdev_arr[0],
temp_notif_ldos);
if (IS_ERR(retp))
return PTR_ERR(retp);
}
if (use_errb)
return bd96801_global_errb_irqs(pdev, all_rdevs,
ARRAY_SIZE(all_rdevs));
return 0;
}
static const struct platform_device_id bd96801_pmic_id[] = {
{ "bd96801-regulator", },
{ }
};
MODULE_DEVICE_TABLE(platform, bd96801_pmic_id);
static struct platform_driver bd96801_regulator = {
.driver = {
.name = "bd96801-pmic"
},
.probe = bd96801_probe,
.id_table = bd96801_pmic_id,
};
module_platform_driver(bd96801_regulator);
MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
MODULE_DESCRIPTION("BD96801 voltage regulator driver");
MODULE_LICENSE("GPL");
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