1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright (C) 2018 The Linux Foundation. All rights reserved.
  4 */
  5
  6#include <linux/module.h>
  7#include <linux/of_device.h>
  8#include <linux/platform_device.h>
  9#include <linux/regmap.h>
 10#include <linux/reset-controller.h>
 11
 12#include <dt-bindings/reset/qcom,sdm845-pdc.h>
 13
 14#define RPMH_PDC_SYNC_RESET	0x100
 15
 16struct qcom_pdc_reset_map {
 17	u8 bit;
 18};
 19
 20struct qcom_pdc_reset_data {
 21	struct reset_controller_dev rcdev;
 22	struct regmap *regmap;
 23};
 24
 25static const struct regmap_config sdm845_pdc_regmap_config = {
 26	.name		= "pdc-reset",
 27	.reg_bits	= 32,
 28	.reg_stride	= 4,
 29	.val_bits	= 32,
 30	.max_register	= 0x20000,
 31	.fast_io	= true,
 32};
 33
 34static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = {
 35	[PDC_APPS_SYNC_RESET] = {0},
 36	[PDC_SP_SYNC_RESET] = {1},
 37	[PDC_AUDIO_SYNC_RESET] = {2},
 38	[PDC_SENSORS_SYNC_RESET] = {3},
 39	[PDC_AOP_SYNC_RESET] = {4},
 40	[PDC_DEBUG_SYNC_RESET] = {5},
 41	[PDC_GPU_SYNC_RESET] = {6},
 42	[PDC_DISPLAY_SYNC_RESET] = {7},
 43	[PDC_COMPUTE_SYNC_RESET] = {8},
 44	[PDC_MODEM_SYNC_RESET] = {9},
 45};
 46
 47static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
 48				struct reset_controller_dev *rcdev)
 49{
 50	return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
 51}
 52
 53static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
 54					unsigned long idx)
 55{
 56	struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
 57
 58	return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
 59				  BIT(sdm845_pdc_resets[idx].bit),
 60				  BIT(sdm845_pdc_resets[idx].bit));
 61}
 62
 63static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
 64					unsigned long idx)
 65{
 66	struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
 67
 68	return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
 69				  BIT(sdm845_pdc_resets[idx].bit), 0);
 70}
 71
 72static const struct reset_control_ops qcom_pdc_reset_ops = {
 73	.assert = qcom_pdc_control_assert,
 74	.deassert = qcom_pdc_control_deassert,
 75};
 76
 77static int qcom_pdc_reset_probe(struct platform_device *pdev)
 78{
 79	struct qcom_pdc_reset_data *data;
 80	struct device *dev = &pdev->dev;
 81	void __iomem *base;
 82	struct resource *res;
 83
 84	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 85	if (!data)
 86		return -ENOMEM;
 87
 88	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 89	base = devm_ioremap_resource(dev, res);
 90	if (IS_ERR(base))
 91		return PTR_ERR(base);
 92
 93	data->regmap = devm_regmap_init_mmio(dev, base,
 94					     &sdm845_pdc_regmap_config);
 95	if (IS_ERR(data->regmap)) {
 96		dev_err(dev, "Unable to initialize regmap\n");
 97		return PTR_ERR(data->regmap);
 98	}
 99
100	data->rcdev.owner = THIS_MODULE;
101	data->rcdev.ops = &qcom_pdc_reset_ops;
102	data->rcdev.nr_resets = ARRAY_SIZE(sdm845_pdc_resets);
103	data->rcdev.of_node = dev->of_node;
104
105	return devm_reset_controller_register(dev, &data->rcdev);
106}
107
108static const struct of_device_id qcom_pdc_reset_of_match[] = {
109	{ .compatible = "qcom,sdm845-pdc-global" },
110	{}
111};
112MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
113
114static struct platform_driver qcom_pdc_reset_driver = {
115	.probe = qcom_pdc_reset_probe,
116	.driver = {
117		.name = "qcom_pdc_reset",
118		.of_match_table = qcom_pdc_reset_of_match,
119	},
120};
121module_platform_driver(qcom_pdc_reset_driver);
122
123MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
124MODULE_LICENSE("GPL v2");