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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 The Linux Foundation. All rights reserved.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/of.h>
#include <dt-bindings/reset/qcom,sdm845-aoss.h>
struct qcom_aoss_reset_map {
unsigned int reg;
};
struct qcom_aoss_desc {
const struct qcom_aoss_reset_map *resets;
size_t num_resets;
};
struct qcom_aoss_reset_data {
struct reset_controller_dev rcdev;
void __iomem *base;
const struct qcom_aoss_desc *desc;
};
static const struct qcom_aoss_reset_map sdm845_aoss_resets[] = {
[AOSS_CC_MSS_RESTART] = {0x10000},
[AOSS_CC_CAMSS_RESTART] = {0x11000},
[AOSS_CC_VENUS_RESTART] = {0x12000},
[AOSS_CC_GPU_RESTART] = {0x13000},
[AOSS_CC_DISPSS_RESTART] = {0x14000},
[AOSS_CC_WCSS_RESTART] = {0x20000},
[AOSS_CC_LPASS_RESTART] = {0x30000},
};
static const struct qcom_aoss_desc sdm845_aoss_desc = {
.resets = sdm845_aoss_resets,
.num_resets = ARRAY_SIZE(sdm845_aoss_resets),
};
static inline struct qcom_aoss_reset_data *to_qcom_aoss_reset_data(
struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct qcom_aoss_reset_data, rcdev);
}
static int qcom_aoss_control_assert(struct reset_controller_dev *rcdev,
unsigned long idx)
{
struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
writel(1, data->base + map->reg);
/* Wait 6 32kHz sleep cycles for reset */
usleep_range(200, 300);
return 0;
}
static int qcom_aoss_control_deassert(struct reset_controller_dev *rcdev,
unsigned long idx)
{
struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
writel(0, data->base + map->reg);
/* Wait 6 32kHz sleep cycles for reset */
usleep_range(200, 300);
return 0;
}
static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev,
unsigned long idx)
{
qcom_aoss_control_assert(rcdev, idx);
return qcom_aoss_control_deassert(rcdev, idx);
}
static const struct reset_control_ops qcom_aoss_reset_ops = {
.reset = qcom_aoss_control_reset,
.assert = qcom_aoss_control_assert,
.deassert = qcom_aoss_control_deassert,
};
static int qcom_aoss_reset_probe(struct platform_device *pdev)
{
struct qcom_aoss_reset_data *data;
struct device *dev = &pdev->dev;
const struct qcom_aoss_desc *desc;
struct resource *res;
desc = of_device_get_match_data(dev);
if (!desc)
return -EINVAL;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->desc = desc;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
data->base = devm_ioremap_resource(dev, res);
if (IS_ERR(data->base))
return PTR_ERR(data->base);
data->rcdev.owner = THIS_MODULE;
data->rcdev.ops = &qcom_aoss_reset_ops;
data->rcdev.nr_resets = desc->num_resets;
data->rcdev.of_node = dev->of_node;
return devm_reset_controller_register(dev, &data->rcdev);
}
static const struct of_device_id qcom_aoss_reset_of_match[] = {
{ .compatible = "qcom,sdm845-aoss-cc", .data = &sdm845_aoss_desc },
{}
};
MODULE_DEVICE_TABLE(of, qcom_aoss_reset_of_match);
static struct platform_driver qcom_aoss_reset_driver = {
.probe = qcom_aoss_reset_probe,
.driver = {
.name = "qcom_aoss_reset",
.of_match_table = qcom_aoss_reset_of_match,
},
};
module_platform_driver(qcom_aoss_reset_driver);
MODULE_DESCRIPTION("Qualcomm AOSS Reset Driver");
MODULE_LICENSE("GPL v2");
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