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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2017-18 Linaro Limited
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/reboot-mode.h>
#include <linux/regmap.h>
#include <linux/spmi.h>
#define PON_SOFT_RB_SPARE 0x8f
#define GEN1_REASON_SHIFT 2
#define GEN2_REASON_SHIFT 1
#define NO_REASON_SHIFT 0
struct qcom_pon {
struct device *dev;
struct regmap *regmap;
struct reboot_mode_driver reboot_mode;
long reason_shift;
};
static int qcom_pon_reboot_mode_write(struct reboot_mode_driver *reboot,
unsigned int magic)
{
struct qcom_pon *pon = container_of
(reboot, struct qcom_pon, reboot_mode);
int ret;
ret = regmap_update_bits(pon->regmap,
PON_SOFT_RB_SPARE,
GENMASK(7, pon->reason_shift),
magic << pon->reason_shift);
if (ret < 0)
dev_err(pon->dev, "update reboot mode bits failed\n");
return ret;
}
static int qcom_pon_probe(struct platform_device *pdev)
{
struct regmap_config qcom_pon_regmap_config = {
.reg_bits = 16,
.val_bits = 8,
.max_register = 0xff,
.fast_io = true,
};
struct device *dev = &pdev->dev;
struct spmi_subdevice *sub_sdev;
struct spmi_device *sparent;
struct qcom_pon *pon;
long reason_shift;
int error;
pon = devm_kzalloc(&pdev->dev, sizeof(*pon), GFP_KERNEL);
if (!pon)
return -ENOMEM;
pon->dev = &pdev->dev;
sparent = spmi_get_parent_spmi_device(dev);
if (!sparent)
return -ENODEV;
sub_sdev = devm_spmi_subdevice_alloc_and_add(dev, sparent);
if (IS_ERR(sub_sdev))
return PTR_ERR(sub_sdev);
error = device_property_read_u32(dev, "reg", &qcom_pon_regmap_config.reg_base);
if (error)
return error;
pon->regmap = devm_regmap_init_spmi_ext(&sub_sdev->sdev, &qcom_pon_regmap_config);
if (IS_ERR(pon->regmap))
return PTR_ERR(pon->regmap);
reason_shift = (long)of_device_get_match_data(&pdev->dev);
if (reason_shift != NO_REASON_SHIFT) {
pon->reboot_mode.dev = &pdev->dev;
pon->reason_shift = reason_shift;
pon->reboot_mode.write = qcom_pon_reboot_mode_write;
error = devm_reboot_mode_register(&pdev->dev, &pon->reboot_mode);
if (error) {
dev_err(&pdev->dev, "can't register reboot mode\n");
return error;
}
}
platform_set_drvdata(pdev, pon);
return devm_of_platform_populate(&pdev->dev);
}
static const struct of_device_id qcom_pon_id_table[] = {
{ .compatible = "qcom,pm8916-pon", .data = (void *)GEN1_REASON_SHIFT },
{ .compatible = "qcom,pm8941-pon", .data = (void *)NO_REASON_SHIFT },
{ .compatible = "qcom,pms405-pon", .data = (void *)GEN1_REASON_SHIFT },
{ .compatible = "qcom,pm8998-pon", .data = (void *)GEN2_REASON_SHIFT },
{ .compatible = "qcom,pmk8350-pon", .data = (void *)GEN2_REASON_SHIFT },
{ }
};
MODULE_DEVICE_TABLE(of, qcom_pon_id_table);
static struct platform_driver qcom_pon_driver = {
.probe = qcom_pon_probe,
.driver = {
.name = "qcom-pon",
.of_match_table = qcom_pon_id_table,
},
};
module_platform_driver(qcom_pon_driver);
MODULE_DESCRIPTION("Qualcomm Power On driver");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS("SPMI");
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