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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <soc/qcom/cmd-db.h>
#include <soc/qcom/rpmh.h>
#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
/**
* enum rpmh_regulator_type - supported RPMh accelerator types
* %VRM: RPMh VRM accelerator which supports voting on enable, voltage,
* and mode of LDO, SMPS, and BOB type PMIC regulators.
* %XOB: RPMh XOB accelerator which supports voting on the enable state
* of PMIC regulators.
*/
enum rpmh_regulator_type {
VRM,
XOB,
};
#define RPMH_REGULATOR_REG_VRM_VOLTAGE 0x0
#define RPMH_REGULATOR_REG_ENABLE 0x4
#define RPMH_REGULATOR_REG_VRM_MODE 0x8
#define PMIC4_LDO_MODE_RETENTION 4
#define PMIC4_LDO_MODE_LPM 5
#define PMIC4_LDO_MODE_HPM 7
#define PMIC4_SMPS_MODE_RETENTION 4
#define PMIC4_SMPS_MODE_PFM 5
#define PMIC4_SMPS_MODE_AUTO 6
#define PMIC4_SMPS_MODE_PWM 7
#define PMIC4_BOB_MODE_PASS 0
#define PMIC4_BOB_MODE_PFM 1
#define PMIC4_BOB_MODE_AUTO 2
#define PMIC4_BOB_MODE_PWM 3
#define PMIC5_LDO_MODE_RETENTION 3
#define PMIC5_LDO_MODE_LPM 4
#define PMIC5_LDO_MODE_HPM 7
#define PMIC5_SMPS_MODE_RETENTION 3
#define PMIC5_SMPS_MODE_PFM 4
#define PMIC5_SMPS_MODE_AUTO 6
#define PMIC5_SMPS_MODE_PWM 7
#define PMIC5_BOB_MODE_PASS 2
#define PMIC5_BOB_MODE_PFM 4
#define PMIC5_BOB_MODE_AUTO 6
#define PMIC5_BOB_MODE_PWM 7
/**
* struct rpmh_vreg_hw_data - RPMh regulator hardware configurations
* @regulator_type: RPMh accelerator type used to manage this
* regulator
* @ops: Pointer to regulator ops callback structure
* @voltage_range: The single range of voltages supported by this
* PMIC regulator type
* @n_voltages: The number of unique voltage set points defined
* by voltage_range
* @hpm_min_load_uA: Minimum load current in microamps that requires
* high power mode (HPM) operation. This is used
* for LDO hardware type regulators only.
* @pmic_mode_map: Array indexed by regulator framework mode
* containing PMIC hardware modes. Must be large
* enough to index all framework modes supported
* by this regulator hardware type.
* @of_map_mode: Maps an RPMH_REGULATOR_MODE_* mode value defined
* in device tree to a regulator framework mode
*/
struct rpmh_vreg_hw_data {
enum rpmh_regulator_type regulator_type;
const struct regulator_ops *ops;
const struct regulator_linear_range voltage_range;
int n_voltages;
int hpm_min_load_uA;
const int *pmic_mode_map;
unsigned int (*of_map_mode)(unsigned int mode);
};
/**
* struct rpmh_vreg - individual RPMh regulator data structure encapsulating a
* single regulator device
* @dev: Device pointer for the top-level PMIC RPMh
* regulator parent device. This is used as a
* handle in RPMh write requests.
* @addr: Base address of the regulator resource within
* an RPMh accelerator
* @rdesc: Regulator descriptor
* @hw_data: PMIC regulator configuration data for this RPMh
* regulator
* @always_wait_for_ack: Boolean flag indicating if a request must always
* wait for an ACK from RPMh before continuing even
* if it corresponds to a strictly lower power
* state (e.g. enabled --> disabled).
* @enabled: Flag indicating if the regulator is enabled or
* not
* @bypassed: Boolean indicating if the regulator is in
* bypass (pass-through) mode or not. This is
* only used by BOB rpmh-regulator resources.
* @voltage_selector: Selector used for get_voltage_sel() and
* set_voltage_sel() callbacks
* @mode: RPMh VRM regulator current framework mode
*/
struct rpmh_vreg {
struct device *dev;
u32 addr;
struct regulator_desc rdesc;
const struct rpmh_vreg_hw_data *hw_data;
bool always_wait_for_ack;
int enabled;
bool bypassed;
int voltage_selector;
unsigned int mode;
};
/**
* struct rpmh_vreg_init_data - initialization data for an RPMh regulator
* @name: Name for the regulator which also corresponds
* to the device tree subnode name of the regulator
* @resource_name: RPMh regulator resource name format string.
* This must include exactly one field: '%s' which
* is filled at run-time with the PMIC ID provided
* by device tree property qcom,pmic-id. Example:
* "ldo%s1" for RPMh resource "ldoa1".
* @supply_name: Parent supply regulator name
* @hw_data: Configuration data for this PMIC regulator type
*/
struct rpmh_vreg_init_data {
const char *name;
const char *resource_name;
const char *supply_name;
const struct rpmh_vreg_hw_data *hw_data;
};
/**
* rpmh_regulator_send_request() - send the request to RPMh
* @vreg: Pointer to the RPMh regulator
* @cmd: Pointer to the RPMh command to send
* @wait_for_ack: Boolean indicating if execution must wait until the
* request has been acknowledged as complete
*
* Return: 0 on success, errno on failure
*/
static int rpmh_regulator_send_request(struct rpmh_vreg *vreg,
struct tcs_cmd *cmd, bool wait_for_ack)
{
int ret;
if (wait_for_ack || vreg->always_wait_for_ack)
ret = rpmh_write(vreg->dev, RPMH_ACTIVE_ONLY_STATE, cmd, 1);
else
ret = rpmh_write_async(vreg->dev, RPMH_ACTIVE_ONLY_STATE, cmd,
1);
return ret;
}
static int _rpmh_regulator_vrm_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector, bool wait_for_ack)
{
struct rpmh_vreg *vreg = rdev_get_drvdata(rdev);
struct tcs_cmd cmd = {
.addr = vreg->addr + RPMH_REGULATOR_REG_VRM_VOLTAGE,
};
int ret;
/* VRM voltage control register is set with voltage in millivolts. */
cmd.data = DIV_ROUND_UP(regulator_list_voltage_linear_range(rdev,
selector), 1000);
ret = rpmh_regulator_send_request(vreg, &cmd, wait_for_ack);
if (!ret)
vreg->voltage_selector = selector;
return ret;
}
static int rpmh_regulator_vrm_set_voltage_sel(struct regulator_dev *rdev,
unsigned int selector)
{
struct rpmh_vreg *vreg = rdev_get_drvdata(rdev);
if (vreg->enabled == -EINVAL) {
/*
* Cache the voltage and send it later when the regulator is
* enabled or disabled.
*/
vreg->voltage_selector = selector;
return 0;
}
return _rpmh_regulator_vrm_set_voltage_sel(rdev, selector,
selector > vreg->voltage_selector);
}
static int rpmh_regulator_vrm_get_voltage_sel(struct regulator_dev *rdev)
{
struct rpmh_vreg *vreg = rdev_
|