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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/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset-controller.h>
#include <dt-bindings/reset/qcom,sdm845-pdc.h>
#define RPMH_SDM845_PDC_SYNC_RESET 0x100
#define RPMH_SC7280_PDC_SYNC_RESET 0x1000
struct qcom_pdc_reset_map {
u8 bit;
};
struct qcom_pdc_reset_desc {
const struct qcom_pdc_reset_map *resets;
size_t num_resets;
unsigned int offset;
};
struct qcom_pdc_reset_data {
struct reset_controller_dev rcdev;
struct regmap *regmap;
const struct qcom_pdc_reset_desc *desc;
};
static const struct regmap_config pdc_regmap_config = {
.name = "pdc-reset",
.reg_bits = 32,
.reg_stride = 4,
.val_bits = 32,
.max_register = 0x20000,
.fast_io = true,
};
static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = {
[PDC_APPS_SYNC_RESET] = {0},
[PDC_SP_SYNC_RESET] = {1},
[PDC_AUDIO_SYNC_RESET] = {2},
[PDC_SENSORS_SYNC_RESET] = {3},
[PDC_AOP_SYNC_RESET] = {4},
[PDC_DEBUG_SYNC_RESET] = {5},
[PDC_GPU_SYNC_RESET] = {6},
[PDC_DISPLAY_SYNC_RESET] = {7},
[PDC_COMPUTE_SYNC_RESET] = {8},
[PDC_MODEM_SYNC_RESET] = {9},
};
static const struct qcom_pdc_reset_desc sdm845_pdc_reset_desc = {
.resets = sdm845_pdc_resets,
.num_resets = ARRAY_SIZE(sdm845_pdc_resets),
.offset = RPMH_SDM845_PDC_SYNC_RESET,
};
static const struct qcom_pdc_reset_map sc7280_pdc_resets[] = {
[PDC_APPS_SYNC_RESET] = {0},
[PDC_SP_SYNC_RESET] = {1},
[PDC_AUDIO_SYNC_RESET] = {2},
[PDC_SENSORS_SYNC_RESET] = {3},
[PDC_AOP_SYNC_RESET] = {4},
[PDC_DEBUG_SYNC_RESET] = {5},
[PDC_GPU_SYNC_RESET] = {6},
[PDC_DISPLAY_SYNC_RESET] = {7},
[PDC_COMPUTE_SYNC_RESET] = {8},
[PDC_MODEM_SYNC_RESET] = {9},
[PDC_WLAN_RF_SYNC_RESET] = {10},
[PDC_WPSS_SYNC_RESET] = {11},
};
static const struct qcom_pdc_reset_desc sc7280_pdc_reset_desc = {
.resets = sc7280_pdc_resets,
.num_resets = ARRAY_SIZE(sc7280_pdc_resets),
.offset = RPMH_SC7280_PDC_SYNC_RESET,
};
static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
}
static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
unsigned long idx)
{
struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
u32 mask = BIT(data->desc->resets[idx].bit);
return regmap_update_bits(data->regmap, data->desc->offset, mask, mask);
}
static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
unsigned long idx)
{
struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
u32 mask = BIT(data->desc->resets[idx].bit);
return regmap_update_bits(data->regmap, data->desc->offset, mask, 0);
}
static const struct reset_control_ops qcom_pdc_reset_ops = {
.assert = qcom_pdc_control_assert,
.deassert = qcom_pdc_control_deassert,
};
static int qcom_pdc_reset_probe(struct platform_device *pdev)
{
const struct qcom_pdc_reset_desc *desc;
struct qcom_pdc_reset_data *data;
struct device *dev = &pdev->dev;
void __iomem *base;
desc = device_get_match_data(&pdev->dev);
if (!desc)
return -EINVAL;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->desc = desc;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base))
return PTR_ERR(base);
data->regmap = devm_regmap_init_mmio(dev, base, &pdc_regmap_config);
if (IS_ERR(data->regmap)) {
dev_err(dev, "Unable to initialize regmap\n");
return PTR_ERR(data->regmap);
}
data->rcdev.owner = THIS_MODULE;
data->rcdev.ops = &qcom_pdc_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_pdc_reset_of_match[] = {
{ .compatible = "qcom,sc7280-pdc-global", .data = &sc7280_pdc_reset_desc },
{ .compatible = "qcom,sdm845-pdc-global", .data = &sdm845_pdc_reset_desc },
{}
};
MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
static struct platform_driver qcom_pdc_reset_driver = {
.probe = qcom_pdc_reset_probe,
.driver = {
.name = "qcom_pdc_reset",
.of_match_table = qcom_pdc_reset_of_match,
},
};
module_platform_driver(qcom_pdc_reset_driver);
MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
MODULE_LICENSE("GPL v2");
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