reset-qcom-pdc.c

  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.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_SDM845_PDC_SYNC_RESET	0x100
 15#define RPMH_SC7280_PDC_SYNC_RESET	0x1000
 16
 17struct qcom_pdc_reset_map {
 18	u8 bit;
 19};
 20
 21struct qcom_pdc_reset_desc {
 22	const struct qcom_pdc_reset_map *resets;
 23	size_t num_resets;
 24	unsigned int offset;
 25};
 26
 27struct qcom_pdc_reset_data {
 28	struct reset_controller_dev rcdev;
 29	struct regmap *regmap;
 30	const struct qcom_pdc_reset_desc *desc;
 31};
 32
 33static const struct regmap_config pdc_regmap_config = {
 34	.name		= "pdc-reset",
 35	.reg_bits	= 32,
 36	.reg_stride	= 4,
 37	.val_bits	= 32,
 38	.max_register	= 0x20000,
 39};
 40
 41static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = {
 42	[PDC_APPS_SYNC_RESET] = {0},
 43	[PDC_SP_SYNC_RESET] = {1},
 44	[PDC_AUDIO_SYNC_RESET] = {2},
 45	[PDC_SENSORS_SYNC_RESET] = {3},
 46	[PDC_AOP_SYNC_RESET] = {4},
 47	[PDC_DEBUG_SYNC_RESET] = {5},
 48	[PDC_GPU_SYNC_RESET] = {6},
 49	[PDC_DISPLAY_SYNC_RESET] = {7},
 50	[PDC_COMPUTE_SYNC_RESET] = {8},
 51	[PDC_MODEM_SYNC_RESET] = {9},
 52};
 53
 54static const struct qcom_pdc_reset_desc sdm845_pdc_reset_desc = {
 55	.resets = sdm845_pdc_resets,
 56	.num_resets = ARRAY_SIZE(sdm845_pdc_resets),
 57	.offset = RPMH_SDM845_PDC_SYNC_RESET,
 58};
 59
 60static const struct qcom_pdc_reset_map sc7280_pdc_resets[] = {
 61	[PDC_APPS_SYNC_RESET] = {0},
 62	[PDC_SP_SYNC_RESET] = {1},
 63	[PDC_AUDIO_SYNC_RESET] = {2},
 64	[PDC_SENSORS_SYNC_RESET] = {3},
 65	[PDC_AOP_SYNC_RESET] = {4},
 66	[PDC_DEBUG_SYNC_RESET] = {5},
 67	[PDC_GPU_SYNC_RESET] = {6},
 68	[PDC_DISPLAY_SYNC_RESET] = {7},
 69	[PDC_COMPUTE_SYNC_RESET] = {8},
 70	[PDC_MODEM_SYNC_RESET] = {9},
 71	[PDC_WLAN_RF_SYNC_RESET] = {10},
 72	[PDC_WPSS_SYNC_RESET] = {11},
 73};
 74
 75static const struct qcom_pdc_reset_desc sc7280_pdc_reset_desc = {
 76	.resets = sc7280_pdc_resets,
 77	.num_resets = ARRAY_SIZE(sc7280_pdc_resets),
 78	.offset = RPMH_SC7280_PDC_SYNC_RESET,
 79};
 80
 81static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
 82				struct reset_controller_dev *rcdev)
 83{
 84	return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
 85}
 86
 87static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
 88					unsigned long idx)
 89{
 90	struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
 91	u32 mask = BIT(data->desc->resets[idx].bit);
 92
 93	return regmap_update_bits(data->regmap, data->desc->offset, mask, mask);
 94}
 95
 96static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
 97					unsigned long idx)
 98{
 99	struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
100	u32 mask = BIT(data->desc->resets[idx].bit);
101
102	return regmap_update_bits(data->regmap, data->desc->offset, mask, 0);
103}
104
105static const struct reset_control_ops qcom_pdc_reset_ops = {
106	.assert = qcom_pdc_control_assert,
107	.deassert = qcom_pdc_control_deassert,
108};
109
110static int qcom_pdc_reset_probe(struct platform_device *pdev)
111{
112	const struct qcom_pdc_reset_desc *desc;
113	struct qcom_pdc_reset_data *data;
114	struct device *dev = &pdev->dev;
115	void __iomem *base;
116
117	desc = device_get_match_data(&pdev->dev);
118	if (!desc)
119		return -EINVAL;
120
121	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
122	if (!data)
123		return -ENOMEM;
124
125	data->desc = desc;
126	base = devm_platform_ioremap_resource(pdev, 0);
127	if (IS_ERR(base))
128		return PTR_ERR(base);
129
130	data->regmap = devm_regmap_init_mmio(dev, base, &pdc_regmap_config);
131	if (IS_ERR(data->regmap)) {
132		dev_err(dev, "Unable to initialize regmap\n");
133		return PTR_ERR(data->regmap);
134	}
135
136	data->rcdev.owner = THIS_MODULE;
137	data->rcdev.ops = &qcom_pdc_reset_ops;
138	data->rcdev.nr_resets = desc->num_resets;
139	data->rcdev.of_node = dev->of_node;
140
141	return devm_reset_controller_register(dev, &data->rcdev);
142}
143
144static const struct of_device_id qcom_pdc_reset_of_match[] = {
145	{ .compatible = "qcom,sc7280-pdc-global", .data = &sc7280_pdc_reset_desc },
146	{ .compatible = "qcom,sdm845-pdc-global", .data = &sdm845_pdc_reset_desc },
147	{}
148};
149MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
150
151static struct platform_driver qcom_pdc_reset_driver = {
152	.probe = qcom_pdc_reset_probe,
153	.driver = {
154		.name = "qcom_pdc_reset",
155		.of_match_table = qcom_pdc_reset_of_match,
156	},
157};
158module_platform_driver(qcom_pdc_reset_driver);
159
160MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
161MODULE_LICENSE("GPL v2");