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");
125