1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2018 The Linux Foundation. All rights reserved.
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>
12 #include <dt-bindings/reset/qcom,sdm845-pdc.h>
14 #define RPMH_PDC_SYNC_RESET 0x100
16 struct qcom_pdc_reset_map {
20 struct qcom_pdc_reset_data {
21 struct reset_controller_dev rcdev;
22 struct regmap *regmap;
25 static const struct regmap_config sdm845_pdc_regmap_config = {
30 .max_register = 0x20000,
34 static 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},
47 static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
48 struct reset_controller_dev *rcdev)
50 return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
53 static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
56 struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
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));
63 static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
66 struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
68 return regmap_update_bits(data->regmap, RPMH_PDC_SYNC_RESET,
69 BIT(sdm845_pdc_resets[idx].bit), 0);
72 static const struct reset_control_ops qcom_pdc_reset_ops = {
73 .assert = qcom_pdc_control_assert,
74 .deassert = qcom_pdc_control_deassert,
77 static int qcom_pdc_reset_probe(struct platform_device *pdev)
79 struct qcom_pdc_reset_data *data;
80 struct device *dev = &pdev->dev;
84 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
88 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
89 base = devm_ioremap_resource(dev, res);
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);
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;
105 return devm_reset_controller_register(dev, &data->rcdev);
108 static const struct of_device_id qcom_pdc_reset_of_match[] = {
109 { .compatible = "qcom,sdm845-pdc-global" },
112 MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
114 static struct platform_driver qcom_pdc_reset_driver = {
115 .probe = qcom_pdc_reset_probe,
117 .name = "qcom_pdc_reset",
118 .of_match_table = qcom_pdc_reset_of_match,
121 module_platform_driver(qcom_pdc_reset_driver);
123 MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
124 MODULE_LICENSE("GPL v2");