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OpenCloudOS-Kernel/drivers/mfd/atc260x-core.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Core support for ATC260x PMICs
*
* Copyright (C) 2019 Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
* Copyright (C) 2020 Cristian Ciocaltea <cristian.ciocaltea@gmail.com>
*/
#include <linux/interrupt.h>
#include <linux/mfd/atc260x/core.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regmap.h>
#define ATC260X_CHIP_REV_MAX 31
struct atc260x_init_regs {
unsigned int cmu_devrst;
unsigned int cmu_devrst_ints;
unsigned int ints_msk;
unsigned int pad_en;
unsigned int pad_en_extirq;
};
static void regmap_lock_mutex(void *__mutex)
{
struct mutex *mutex = __mutex;
/*
* Using regmap within an atomic context (e.g. accessing a PMIC when
* powering system down) is normally allowed only if the regmap type
* is MMIO and the regcache type is either REGCACHE_NONE or
* REGCACHE_FLAT. For slow buses like I2C and SPI, the regmap is
* internally protected by a mutex which is acquired non-atomically.
*
* Let's improve this by using a customized locking scheme inspired
* from I2C atomic transfer. See i2c_in_atomic_xfer_mode() for a
* starting point.
*/
if (system_state > SYSTEM_RUNNING && irqs_disabled())
mutex_trylock(mutex);
else
mutex_lock(mutex);
}
static void regmap_unlock_mutex(void *__mutex)
{
struct mutex *mutex = __mutex;
mutex_unlock(mutex);
}
static const struct regmap_config atc2603c_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = ATC2603C_SADDR,
.cache_type = REGCACHE_NONE,
};
static const struct regmap_config atc2609a_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = ATC2609A_SADDR,
.cache_type = REGCACHE_NONE,
};
static const struct regmap_irq atc2603c_regmap_irqs[] = {
REGMAP_IRQ_REG(ATC2603C_IRQ_AUDIO, 0, ATC2603C_INTS_MSK_AUDIO),
REGMAP_IRQ_REG(ATC2603C_IRQ_OV, 0, ATC2603C_INTS_MSK_OV),
REGMAP_IRQ_REG(ATC2603C_IRQ_OC, 0, ATC2603C_INTS_MSK_OC),
REGMAP_IRQ_REG(ATC2603C_IRQ_OT, 0, ATC2603C_INTS_MSK_OT),
REGMAP_IRQ_REG(ATC2603C_IRQ_UV, 0, ATC2603C_INTS_MSK_UV),
REGMAP_IRQ_REG(ATC2603C_IRQ_ALARM, 0, ATC2603C_INTS_MSK_ALARM),
REGMAP_IRQ_REG(ATC2603C_IRQ_ONOFF, 0, ATC2603C_INTS_MSK_ONOFF),
REGMAP_IRQ_REG(ATC2603C_IRQ_SGPIO, 0, ATC2603C_INTS_MSK_SGPIO),
REGMAP_IRQ_REG(ATC2603C_IRQ_IR, 0, ATC2603C_INTS_MSK_IR),
REGMAP_IRQ_REG(ATC2603C_IRQ_REMCON, 0, ATC2603C_INTS_MSK_REMCON),
REGMAP_IRQ_REG(ATC2603C_IRQ_POWER_IN, 0, ATC2603C_INTS_MSK_POWERIN),
};
static const struct regmap_irq atc2609a_regmap_irqs[] = {
REGMAP_IRQ_REG(ATC2609A_IRQ_AUDIO, 0, ATC2609A_INTS_MSK_AUDIO),
REGMAP_IRQ_REG(ATC2609A_IRQ_OV, 0, ATC2609A_INTS_MSK_OV),
REGMAP_IRQ_REG(ATC2609A_IRQ_OC, 0, ATC2609A_INTS_MSK_OC),
REGMAP_IRQ_REG(ATC2609A_IRQ_OT, 0, ATC2609A_INTS_MSK_OT),
REGMAP_IRQ_REG(ATC2609A_IRQ_UV, 0, ATC2609A_INTS_MSK_UV),
REGMAP_IRQ_REG(ATC2609A_IRQ_ALARM, 0, ATC2609A_INTS_MSK_ALARM),
REGMAP_IRQ_REG(ATC2609A_IRQ_ONOFF, 0, ATC2609A_INTS_MSK_ONOFF),
REGMAP_IRQ_REG(ATC2609A_IRQ_WKUP, 0, ATC2609A_INTS_MSK_WKUP),
REGMAP_IRQ_REG(ATC2609A_IRQ_IR, 0, ATC2609A_INTS_MSK_IR),
REGMAP_IRQ_REG(ATC2609A_IRQ_REMCON, 0, ATC2609A_INTS_MSK_REMCON),
REGMAP_IRQ_REG(ATC2609A_IRQ_POWER_IN, 0, ATC2609A_INTS_MSK_POWERIN),
};
static const struct regmap_irq_chip atc2603c_regmap_irq_chip = {
.name = "atc2603c",
.irqs = atc2603c_regmap_irqs,
.num_irqs = ARRAY_SIZE(atc2603c_regmap_irqs),
.num_regs = 1,
.status_base = ATC2603C_INTS_PD,
.unmask_base = ATC2603C_INTS_MSK,
};
static const struct regmap_irq_chip atc2609a_regmap_irq_chip = {
.name = "atc2609a",
.irqs = atc2609a_regmap_irqs,
.num_irqs = ARRAY_SIZE(atc2609a_regmap_irqs),
.num_regs = 1,
.status_base = ATC2609A_INTS_PD,
.unmask_base = ATC2609A_INTS_MSK,
};
static const struct resource atc2603c_onkey_resources[] = {
DEFINE_RES_IRQ(ATC2603C_IRQ_ONOFF),
};
static const struct resource atc2609a_onkey_resources[] = {
DEFINE_RES_IRQ(ATC2609A_IRQ_ONOFF),
};
static const struct mfd_cell atc2603c_mfd_cells[] = {
{ .name = "atc260x-regulator" },
{ .name = "atc260x-pwrc" },
{
.name = "atc260x-onkey",
.num_resources = ARRAY_SIZE(atc2603c_onkey_resources),
.resources = atc2603c_onkey_resources,
},
};
static const struct mfd_cell atc2609a_mfd_cells[] = {
{ .name = "atc260x-regulator" },
{ .name = "atc260x-pwrc" },
{
.name = "atc260x-onkey",
.num_resources = ARRAY_SIZE(atc2609a_onkey_resources),
.resources = atc2609a_onkey_resources,
},
};
static const struct atc260x_init_regs atc2603c_init_regs = {
.cmu_devrst = ATC2603C_CMU_DEVRST,
.cmu_devrst_ints = ATC2603C_CMU_DEVRST_INTS,
.ints_msk = ATC2603C_INTS_MSK,
.pad_en = ATC2603C_PAD_EN,
.pad_en_extirq = ATC2603C_PAD_EN_EXTIRQ,
};
static const struct atc260x_init_regs atc2609a_init_regs = {
.cmu_devrst = ATC2609A_CMU_DEVRST,
.cmu_devrst_ints = ATC2609A_CMU_DEVRST_INTS,
.ints_msk = ATC2609A_INTS_MSK,
.pad_en = ATC2609A_PAD_EN,
.pad_en_extirq = ATC2609A_PAD_EN_EXTIRQ,
};
static void atc260x_cmu_reset(struct atc260x *atc260x)
{
const struct atc260x_init_regs *regs = atc260x->init_regs;
/* Assert reset */
regmap_update_bits(atc260x->regmap, regs->cmu_devrst,
regs->cmu_devrst_ints, ~regs->cmu_devrst_ints);
/* De-assert reset */
regmap_update_bits(atc260x->regmap, regs->cmu_devrst,
regs->cmu_devrst_ints, regs->cmu_devrst_ints);
}
static void atc260x_dev_init(struct atc260x *atc260x)
{
const struct atc260x_init_regs *regs = atc260x->init_regs;
/* Initialize interrupt block */
atc260x_cmu_reset(atc260x);
/* Disable all interrupt sources */
regmap_write(atc260x->regmap, regs->ints_msk, 0);
/* Enable EXTIRQ pad */
regmap_update_bits(atc260x->regmap, regs->pad_en,
regs->pad_en_extirq, regs->pad_en_extirq);
}
/**
* atc260x_match_device(): Setup ATC260x variant related fields
*
* @atc260x: ATC260x device to setup (.dev field must be set)
* @regmap_cfg: regmap config associated with this ATC260x device
*
* This lets the ATC260x core configure the MFD cells and register maps
* for later use.
*/
int atc260x_match_device(struct atc260x *atc260x, struct regmap_config *regmap_cfg)
{
struct device *dev = atc260x->dev;
const void *of_data;
of_data = of_device_get_match_data(dev);
if (!of_data)
return -ENODEV;
atc260x->ic_type = (unsigned long)of_data;
switch (atc260x->ic_type) {
case ATC2603C:
*regmap_cfg = atc2603c_regmap_config;
atc260x->regmap_irq_chip = &atc2603c_regmap_irq_chip;
atc260x->cells = atc2603c_mfd_cells;
atc260x->nr_cells = ARRAY_SIZE(atc2603c_mfd_cells);
atc260x->type_name = "atc2603c";
atc260x->rev_reg = ATC2603C_CHIP_VER;
atc260x->init_regs = &atc2603c_init_regs;
break;
case ATC2609A:
*regmap_cfg = atc2609a_regmap_config;
atc260x->regmap_irq_chip = &atc2609a_regmap_irq_chip;
atc260x->cells = atc2609a_mfd_cells;
atc260x->nr_cells = ARRAY_SIZE(atc2609a_mfd_cells);
atc260x->type_name = "atc2609a";
atc260x->rev_reg = ATC2609A_CHIP_VER;
atc260x->init_regs = &atc2609a_init_regs;
break;
default:
dev_err(dev, "Unsupported ATC260x device type: %u\n",
atc260x->ic_type);
return -EINVAL;
}
atc260x->regmap_mutex = devm_kzalloc(dev, sizeof(*atc260x->regmap_mutex),
GFP_KERNEL);
if (!atc260x->regmap_mutex)
return -ENOMEM;
mutex_init(atc260x->regmap_mutex);
regmap_cfg->lock = regmap_lock_mutex,
regmap_cfg->unlock = regmap_unlock_mutex,
regmap_cfg->lock_arg = atc260x->regmap_mutex;
return 0;
}
EXPORT_SYMBOL_GPL(atc260x_match_device);
/**
* atc260x_device_probe(): Probe a configured ATC260x device
*
* @atc260x: ATC260x device to probe (must be configured)
*
* This function lets the ATC260x core register the ATC260x MFD devices
* and IRQCHIP. The ATC260x device passed in must be fully configured
* with atc260x_match_device, its IRQ set, and regmap created.
*/
int atc260x_device_probe(struct atc260x *atc260x)
{
struct device *dev = atc260x->dev;
unsigned int chip_rev;
int ret;
if (!atc260x->irq) {
dev_err(dev, "No interrupt support\n");
return -EINVAL;
}
/* Initialize the hardware */
atc260x_dev_init(atc260x);
ret = regmap_read(atc260x->regmap, atc260x->rev_reg, &chip_rev);
if (ret) {
dev_err(dev, "Failed to get chip revision\n");
return ret;
}
if (chip_rev > ATC260X_CHIP_REV_MAX) {
dev_err(dev, "Unknown chip revision: %u\n", chip_rev);
return -EINVAL;
}
atc260x->ic_ver = __ffs(chip_rev + 1U);
dev_info(dev, "Detected chip type %s rev.%c\n",
atc260x->type_name, 'A' + atc260x->ic_ver);
ret = devm_regmap_add_irq_chip(dev, atc260x->regmap, atc260x->irq, IRQF_ONESHOT,
-1, atc260x->regmap_irq_chip, &atc260x->irq_data);
if (ret) {
dev_err(dev, "Failed to add IRQ chip: %d\n", ret);
return ret;
}
ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
atc260x->cells, atc260x->nr_cells, NULL, 0,
regmap_irq_get_domain(atc260x->irq_data));
if (ret) {
dev_err(dev, "Failed to add child devices: %d\n", ret);
regmap_del_irq_chip(atc260x->irq, atc260x->irq_data);
}
return ret;
}
EXPORT_SYMBOL_GPL(atc260x_device_probe);
MODULE_DESCRIPTION("ATC260x PMICs Core support");
MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>");
MODULE_AUTHOR("Cristian Ciocaltea <cristian.ciocaltea@gmail.com>");
MODULE_LICENSE("GPL");
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