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linux/drivers/regulator/mc13783-regulator.c
Douglas Anderson 259b93b21a
regulator: Set PROBE_PREFER_ASYNCHRONOUS for drivers that existed in 4.14 
Probing of regulators can be a slow operation and can contribute to
slower boot times. This is especially true if a regulator is turned on
at probe time (with regulator-boot-on or regulator-always-on) and the
regulator requires delays (off-on-time, ramp time, etc).

While the overall kernel is not ready to switch to async probe by
default, as per the discussion on the mailing lists [1] it is believed
that the regulator subsystem is in good shape and we can move
regulator drivers over wholesale. There is no way to just magically
opt in all regulators (regulators are just normal drivers like
platform_driver), so we set PROBE_PREFER_ASYNCHRONOUS for all
regulators found in 'drivers/regulator' individually.

Given the number of drivers touched and the impossibility to test this
ahead of time, it wouldn't be shocking at all if this caused a
regression for someone. If there is a regression caused by this patch,
it's likely to be one of the cases talked about in [1]. As a "quick
fix", drivers involved in the regression could be fixed by changing
them to PROBE_FORCE_SYNCHRONOUS. That being said, the correct fix
would be to directly fix the problem that caused the issue with async
probe.

The approach here follows a similar approach that was used for the mmc
subsystem several years ago [2]. In fact, I ran nearly the same python
script to auto-generate the changes. The only thing I changed was to
search for "i2c_driver", "spmi_driver", and "spi_driver" in addition
to "platform_driver".

[1] https://lore.kernel.org/r/06db017f-e985-4434-8d1d-02ca2100cca0@sirena.org.uk
[2] https://lore.kernel.org/r/20200903232441.2694866-1-dianders@chromium.org/

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20230316125351.1.I2a4677392a38db5758dee0788b2cea5872562a82@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-03-20 13:11:25 +00:00

479 lines
16 KiB
C
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// SPDX-License-Identifier: GPL-2.0
//
// Regulator Driver for Freescale MC13783 PMIC
//
// Copyright 2010 Yong Shen <yong.shen@linaro.org>
// Copyright (C) 2008 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
// Copyright 2009 Alberto Panizzo <maramaopercheseimorto@gmail.com>
#include <linux/mfd/mc13783.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/driver.h>
#include <linux/platform_device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/module.h>
#include "mc13xxx.h"
#define MC13783_REG_SWITCHERS0 24
/* Enable does not exist for SW1A */
#define MC13783_REG_SWITCHERS0_SW1AEN 0
#define MC13783_REG_SWITCHERS0_SW1AVSEL 0
#define MC13783_REG_SWITCHERS0_SW1AVSEL_M (63 << 0)
#define MC13783_REG_SWITCHERS1 25
/* Enable does not exist for SW1B */
#define MC13783_REG_SWITCHERS1_SW1BEN 0
#define MC13783_REG_SWITCHERS1_SW1BVSEL 0
#define MC13783_REG_SWITCHERS1_SW1BVSEL_M (63 << 0)
#define MC13783_REG_SWITCHERS2 26
/* Enable does not exist for SW2A */
#define MC13783_REG_SWITCHERS2_SW2AEN 0
#define MC13783_REG_SWITCHERS2_SW2AVSEL 0
#define MC13783_REG_SWITCHERS2_SW2AVSEL_M (63 << 0)
#define MC13783_REG_SWITCHERS3 27
/* Enable does not exist for SW2B */
#define MC13783_REG_SWITCHERS3_SW2BEN 0
#define MC13783_REG_SWITCHERS3_SW2BVSEL 0
#define MC13783_REG_SWITCHERS3_SW2BVSEL_M (63 << 0)
#define MC13783_REG_SWITCHERS5 29
#define MC13783_REG_SWITCHERS5_SW3EN (1 << 20)
#define MC13783_REG_SWITCHERS5_SW3VSEL 18
#define MC13783_REG_SWITCHERS5_SW3VSEL_M (3 << 18)
#define MC13783_REG_REGULATORSETTING0 30
#define MC13783_REG_REGULATORSETTING0_VIOLOVSEL 2
#define MC13783_REG_REGULATORSETTING0_VDIGVSEL 4
#define MC13783_REG_REGULATORSETTING0_VGENVSEL 6
#define MC13783_REG_REGULATORSETTING0_VRFDIGVSEL 9
#define MC13783_REG_REGULATORSETTING0_VRFREFVSEL 11
#define MC13783_REG_REGULATORSETTING0_VRFCPVSEL 13
#define MC13783_REG_REGULATORSETTING0_VSIMVSEL 14
#define MC13783_REG_REGULATORSETTING0_VESIMVSEL 15
#define MC13783_REG_REGULATORSETTING0_VCAMVSEL 16
#define MC13783_REG_REGULATORSETTING0_VIOLOVSEL_M (3 << 2)
#define MC13783_REG_REGULATORSETTING0_VDIGVSEL_M (3 << 4)
#define MC13783_REG_REGULATORSETTING0_VGENVSEL_M (7 << 6)
#define MC13783_REG_REGULATORSETTING0_VRFDIGVSEL_M (3 << 9)
#define MC13783_REG_REGULATORSETTING0_VRFREFVSEL_M (3 << 11)
#define MC13783_REG_REGULATORSETTING0_VRFCPVSEL_M (1 << 13)
#define MC13783_REG_REGULATORSETTING0_VSIMVSEL_M (1 << 14)
#define MC13783_REG_REGULATORSETTING0_VESIMVSEL_M (1 << 15)
#define MC13783_REG_REGULATORSETTING0_VCAMVSEL_M (7 << 16)
#define MC13783_REG_REGULATORSETTING1 31
#define MC13783_REG_REGULATORSETTING1_VVIBVSEL 0
#define MC13783_REG_REGULATORSETTING1_VRF1VSEL 2
#define MC13783_REG_REGULATORSETTING1_VRF2VSEL 4
#define MC13783_REG_REGULATORSETTING1_VMMC1VSEL 6
#define MC13783_REG_REGULATORSETTING1_VMMC2VSEL 9
#define MC13783_REG_REGULATORSETTING1_VVIBVSEL_M (3 << 0)
#define MC13783_REG_REGULATORSETTING1_VRF1VSEL_M (3 << 2)
#define MC13783_REG_REGULATORSETTING1_VRF2VSEL_M (3 << 4)
#define MC13783_REG_REGULATORSETTING1_VMMC1VSEL_M (7 << 6)
#define MC13783_REG_REGULATORSETTING1_VMMC2VSEL_M (7 << 9)
#define MC13783_REG_REGULATORMODE0 32
#define MC13783_REG_REGULATORMODE0_VAUDIOEN (1 << 0)
#define MC13783_REG_REGULATORMODE0_VIOHIEN (1 << 3)
#define MC13783_REG_REGULATORMODE0_VIOLOEN (1 << 6)
#define MC13783_REG_REGULATORMODE0_VDIGEN (1 << 9)
#define MC13783_REG_REGULATORMODE0_VGENEN (1 << 12)
#define MC13783_REG_REGULATORMODE0_VRFDIGEN (1 << 15)
#define MC13783_REG_REGULATORMODE0_VRFREFEN (1 << 18)
#define MC13783_REG_REGULATORMODE0_VRFCPEN (1 << 21)
#define MC13783_REG_REGULATORMODE1 33
#define MC13783_REG_REGULATORMODE1_VSIMEN (1 << 0)
#define MC13783_REG_REGULATORMODE1_VESIMEN (1 << 3)
#define MC13783_REG_REGULATORMODE1_VCAMEN (1 << 6)
#define MC13783_REG_REGULATORMODE1_VRFBGEN (1 << 9)
#define MC13783_REG_REGULATORMODE1_VVIBEN (1 << 11)
#define MC13783_REG_REGULATORMODE1_VRF1EN (1 << 12)
#define MC13783_REG_REGULATORMODE1_VRF2EN (1 << 15)
#define MC13783_REG_REGULATORMODE1_VMMC1EN (1 << 18)
#define MC13783_REG_REGULATORMODE1_VMMC2EN (1 << 21)
#define MC13783_REG_POWERMISC 34
#define MC13783_REG_POWERMISC_GPO1EN (1 << 6)
#define MC13783_REG_POWERMISC_GPO2EN (1 << 8)
#define MC13783_REG_POWERMISC_GPO3EN (1 << 10)
#define MC13783_REG_POWERMISC_GPO4EN (1 << 12)
#define MC13783_REG_POWERMISC_PWGT1SPIEN (1 << 15)
#define MC13783_REG_POWERMISC_PWGT2SPIEN (1 << 16)
#define MC13783_REG_POWERMISC_PWGTSPI_M (3 << 15)
/* Voltage Values */
static const int mc13783_sw1x_val[] = {
900000, 925000, 950000, 975000,
1000000, 1025000, 1050000, 1075000,
1100000, 1125000, 1150000, 1175000,
1200000, 1225000, 1250000, 1275000,
1300000, 1325000, 1350000, 1375000,
1400000, 1425000, 1450000, 1475000,
1500000, 1525000, 1550000, 1575000,
1600000, 1625000, 1650000, 1675000,
1700000, 1700000, 1700000, 1700000,
1800000, 1800000, 1800000, 1800000,
1850000, 1850000, 1850000, 1850000,
2000000, 2000000, 2000000, 2000000,
2100000, 2100000, 2100000, 2100000,
2200000, 2200000, 2200000, 2200000,
2200000, 2200000, 2200000, 2200000,
2200000, 2200000, 2200000, 2200000,
};
static const int mc13783_sw2x_val[] = {
900000, 925000, 950000, 975000,
1000000, 1025000, 1050000, 1075000,
1100000, 1125000, 1150000, 1175000,
1200000, 1225000, 1250000, 1275000,
1300000, 1325000, 1350000, 1375000,
1400000, 1425000, 1450000, 1475000,
1500000, 1525000, 1550000, 1575000,
1600000, 1625000, 1650000, 1675000,
1700000, 1700000, 1700000, 1700000,
1800000, 1800000, 1800000, 1800000,
1900000, 1900000, 1900000, 1900000,
2000000, 2000000, 2000000, 2000000,
2100000, 2100000, 2100000, 2100000,
2200000, 2200000, 2200000, 2200000,
2200000, 2200000, 2200000, 2200000,
2200000, 2200000, 2200000, 2200000,
};
static const unsigned int mc13783_sw3_val[] = {
5000000, 5000000, 5000000, 5500000,
};
static const unsigned int mc13783_vaudio_val[] = {
2775000,
};
static const unsigned int mc13783_viohi_val[] = {
2775000,
};
static const unsigned int mc13783_violo_val[] = {
1200000, 1300000, 1500000, 1800000,
};
static const unsigned int mc13783_vdig_val[] = {
1200000, 1300000, 1500000, 1800000,
};
static const unsigned int mc13783_vgen_val[] = {
1200000, 1300000, 1500000, 1800000,
1100000, 2000000, 2775000, 2400000,
};
static const unsigned int mc13783_vrfdig_val[] = {
1200000, 1500000, 1800000, 1875000,
};
static const unsigned int mc13783_vrfref_val[] = {
2475000, 2600000, 2700000, 2775000,
};
static const unsigned int mc13783_vrfcp_val[] = {
2700000, 2775000,
};
static const unsigned int mc13783_vsim_val[] = {
1800000, 2900000, 3000000,
};
static const unsigned int mc13783_vesim_val[] = {
1800000, 2900000,
};
static const unsigned int mc13783_vcam_val[] = {
1500000, 1800000, 2500000, 2550000,
2600000, 2750000, 2800000, 3000000,
};
static const unsigned int mc13783_vrfbg_val[] = {
1250000,
};
static const unsigned int mc13783_vvib_val[] = {
1300000, 1800000, 2000000, 3000000,
};
static const unsigned int mc13783_vmmc_val[] = {
1600000, 1800000, 2000000, 2600000,
2700000, 2800000, 2900000, 3000000,
};
static const unsigned int mc13783_vrf_val[] = {
1500000, 1875000, 2700000, 2775000,
};
static const unsigned int mc13783_gpo_val[] = {
3100000,
};
static const unsigned int mc13783_pwgtdrv_val[] = {
5500000,
};
static const struct regulator_ops mc13783_gpo_regulator_ops;
#define MC13783_DEFINE(prefix, name, node, reg, vsel_reg, voltages) \
MC13xxx_DEFINE(MC13783_REG_, name, node, reg, vsel_reg, voltages, \
mc13xxx_regulator_ops)
#define MC13783_FIXED_DEFINE(prefix, name, node, reg, voltages) \
MC13xxx_FIXED_DEFINE(MC13783_REG_, name, node, reg, voltages, \
mc13xxx_fixed_regulator_ops)
#define MC13783_GPO_DEFINE(prefix, name, node, reg, voltages) \
MC13xxx_GPO_DEFINE(MC13783_REG_, name, node, reg, voltages, \
mc13783_gpo_regulator_ops)
#define MC13783_DEFINE_SW(_name, _node, _reg, _vsel_reg, _voltages) \
MC13783_DEFINE(REG, _name, _node, _reg, _vsel_reg, _voltages)
#define MC13783_DEFINE_REGU(_name, _node, _reg, _vsel_reg, _voltages) \
MC13783_DEFINE(REG, _name, _node, _reg, _vsel_reg, _voltages)
static struct mc13xxx_regulator mc13783_regulators[] = {
MC13783_DEFINE_SW(SW1A, sw1a, SWITCHERS0, SWITCHERS0, mc13783_sw1x_val),
MC13783_DEFINE_SW(SW1B, sw1b, SWITCHERS1, SWITCHERS1, mc13783_sw1x_val),
MC13783_DEFINE_SW(SW2A, sw2a, SWITCHERS2, SWITCHERS2, mc13783_sw2x_val),
MC13783_DEFINE_SW(SW2B, sw2b, SWITCHERS3, SWITCHERS3, mc13783_sw2x_val),
MC13783_DEFINE_SW(SW3, sw3, SWITCHERS5, SWITCHERS5, mc13783_sw3_val),
MC13783_FIXED_DEFINE(REG, VAUDIO, vaudio, REGULATORMODE0, mc13783_vaudio_val),
MC13783_FIXED_DEFINE(REG, VIOHI, viohi, REGULATORMODE0, mc13783_viohi_val),
MC13783_DEFINE_REGU(VIOLO, violo, REGULATORMODE0, REGULATORSETTING0,
mc13783_violo_val),
MC13783_DEFINE_REGU(VDIG, vdig, REGULATORMODE0, REGULATORSETTING0,
mc13783_vdig_val),
MC13783_DEFINE_REGU(VGEN, vgen, REGULATORMODE0, REGULATORSETTING0,
mc13783_vgen_val),
MC13783_DEFINE_REGU(VRFDIG, vrfdig, REGULATORMODE0, REGULATORSETTING0,
mc13783_vrfdig_val),
MC13783_DEFINE_REGU(VRFREF, vrfref, REGULATORMODE0, REGULATORSETTING0,
mc13783_vrfref_val),
MC13783_DEFINE_REGU(VRFCP, vrfcp, REGULATORMODE0, REGULATORSETTING0,
mc13783_vrfcp_val),
MC13783_DEFINE_REGU(VSIM, vsim, REGULATORMODE1, REGULATORSETTING0,
mc13783_vsim_val),
MC13783_DEFINE_REGU(VESIM, vesim, REGULATORMODE1, REGULATORSETTING0,
mc13783_vesim_val),
MC13783_DEFINE_REGU(VCAM, vcam, REGULATORMODE1, REGULATORSETTING0,
mc13783_vcam_val),
MC13783_FIXED_DEFINE(REG, VRFBG, vrfbg, REGULATORMODE1, mc13783_vrfbg_val),
MC13783_DEFINE_REGU(VVIB, vvib, REGULATORMODE1, REGULATORSETTING1,
mc13783_vvib_val),
MC13783_DEFINE_REGU(VRF1, vrf1, REGULATORMODE1, REGULATORSETTING1,
mc13783_vrf_val),
MC13783_DEFINE_REGU(VRF2, vrf2, REGULATORMODE1, REGULATORSETTING1,
mc13783_vrf_val),
MC13783_DEFINE_REGU(VMMC1, vmmc1, REGULATORMODE1, REGULATORSETTING1,
mc13783_vmmc_val),
MC13783_DEFINE_REGU(VMMC2, vmmc2, REGULATORMODE1, REGULATORSETTING1,
mc13783_vmmc_val),
MC13783_GPO_DEFINE(REG, GPO1, gpo1, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REG, GPO2, gpo1, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REG, GPO3, gpo1, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REG, GPO4, gpo1, POWERMISC, mc13783_gpo_val),
MC13783_GPO_DEFINE(REG, PWGT1SPI, pwgt1spi, POWERMISC, mc13783_pwgtdrv_val),
MC13783_GPO_DEFINE(REG, PWGT2SPI, pwgt2spi, POWERMISC, mc13783_pwgtdrv_val),
};
static int mc13783_powermisc_rmw(struct mc13xxx_regulator_priv *priv, u32 mask,
u32 val)
{
struct mc13xxx *mc13783 = priv->mc13xxx;
int ret;
u32 valread;
BUG_ON(val & ~mask);
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_read(mc13783, MC13783_REG_POWERMISC, &valread);
if (ret)
goto out;
/* Update the stored state for Power Gates. */
priv->powermisc_pwgt_state =
(priv->powermisc_pwgt_state & ~mask) | val;
priv->powermisc_pwgt_state &= MC13783_REG_POWERMISC_PWGTSPI_M;
/* Construct the new register value */
valread = (valread & ~mask) | val;
/* Overwrite the PWGTxEN with the stored version */
valread = (valread & ~MC13783_REG_POWERMISC_PWGTSPI_M) |
priv->powermisc_pwgt_state;
ret = mc13xxx_reg_write(mc13783, MC13783_REG_POWERMISC, valread);
out:
mc13xxx_unlock(priv->mc13xxx);
return ret;
}
static int mc13783_gpo_regulator_enable(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
int id = rdev_get_id(rdev);
u32 en_val = mc13xxx_regulators[id].enable_bit;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
/* Power Gate enable value is 0 */
if (id == MC13783_REG_PWGT1SPI ||
id == MC13783_REG_PWGT2SPI)
en_val = 0;
return mc13783_powermisc_rmw(priv, mc13xxx_regulators[id].enable_bit,
en_val);
}
static int mc13783_gpo_regulator_disable(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
int id = rdev_get_id(rdev);
u32 dis_val = 0;
dev_dbg(rdev_get_dev(rdev), "%s id: %d\n", __func__, id);
/* Power Gate disable value is 1 */
if (id == MC13783_REG_PWGT1SPI ||
id == MC13783_REG_PWGT2SPI)
dis_val = mc13xxx_regulators[id].enable_bit;
return mc13783_powermisc_rmw(priv, mc13xxx_regulators[id].enable_bit,
dis_val);
}
static int mc13783_gpo_regulator_is_enabled(struct regulator_dev *rdev)
{
struct mc13xxx_regulator_priv *priv = rdev_get_drvdata(rdev);
struct mc13xxx_regulator *mc13xxx_regulators = priv->mc13xxx_regulators;
int ret, id = rdev_get_id(rdev);
unsigned int val;
mc13xxx_lock(priv->mc13xxx);
ret = mc13xxx_reg_read(priv->mc13xxx, mc13xxx_regulators[id].reg, &val);
mc13xxx_unlock(priv->mc13xxx);
if (ret)
return ret;
/* Power Gates state is stored in powermisc_pwgt_state
* where the meaning of bits is negated */
val = (val & ~MC13783_REG_POWERMISC_PWGTSPI_M) |
(priv->powermisc_pwgt_state ^ MC13783_REG_POWERMISC_PWGTSPI_M);
return (val & mc13xxx_regulators[id].enable_bit) != 0;
}
static const struct regulator_ops mc13783_gpo_regulator_ops = {
.enable = mc13783_gpo_regulator_enable,
.disable = mc13783_gpo_regulator_disable,
.is_enabled = mc13783_gpo_regulator_is_enabled,
.list_voltage = regulator_list_voltage_table,
.set_voltage = mc13xxx_fixed_regulator_set_voltage,
};
static int mc13783_regulator_probe(struct platform_device *pdev)
{
struct mc13xxx_regulator_priv *priv;
struct mc13xxx *mc13783 = dev_get_drvdata(pdev->dev.parent);
struct mc13xxx_regulator_platform_data *pdata =
dev_get_platdata(&pdev->dev);
struct mc13xxx_regulator_init_data *mc13xxx_data;
struct regulator_config config = { };
int i, num_regulators;
num_regulators = mc13xxx_get_num_regulators_dt(pdev);
if (num_regulators <= 0 && pdata)
num_regulators = pdata->num_regulators;
if (num_regulators <= 0)
return -EINVAL;
priv = devm_kzalloc(&pdev->dev,
struct_size(priv, regulators, num_regulators),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->num_regulators = num_regulators;
priv->mc13xxx_regulators = mc13783_regulators;
priv->mc13xxx = mc13783;
platform_set_drvdata(pdev, priv);
mc13xxx_data = mc13xxx_parse_regulators_dt(pdev, mc13783_regulators,
ARRAY_SIZE(mc13783_regulators));
for (i = 0; i < priv->num_regulators; i++) {
struct regulator_init_data *init_data;
struct regulator_desc *desc;
struct device_node *node = NULL;
int id;
if (mc13xxx_data) {
id = mc13xxx_data[i].id;
init_data = mc13xxx_data[i].init_data;
node = mc13xxx_data[i].node;
} else {
id = pdata->regulators[i].id;
init_data = pdata->regulators[i].init_data;
}
desc = &mc13783_regulators[id].desc;
config.dev = &pdev->dev;
config.init_data = init_data;
config.driver_data = priv;
config.of_node = node;
priv->regulators[i] = devm_regulator_register(&pdev->dev, desc,
&config);
if (IS_ERR(priv->regulators[i])) {
dev_err(&pdev->dev, "failed to register regulator %s\n",
mc13783_regulators[i].desc.name);
return PTR_ERR(priv->regulators[i]);
}
}
return 0;
}
static struct platform_driver mc13783_regulator_driver = {
.driver = {
.name = "mc13783-regulator",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = mc13783_regulator_probe,
};
static int __init mc13783_regulator_init(void)
{
return platform_driver_register(&mc13783_regulator_driver);
}
subsys_initcall(mc13783_regulator_init);
static void __exit mc13783_regulator_exit(void)
{
platform_driver_unregister(&mc13783_regulator_driver);
}
module_exit(mc13783_regulator_exit);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
MODULE_DESCRIPTION("Regulator Driver for Freescale MC13783 PMIC");
MODULE_ALIAS("platform:mc13783-regulator");
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