Merge tag 'v4.20' into for-linus
[linux-2.6-microblaze.git] / drivers / reset / 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_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
16 struct qcom_pdc_reset_map {
17         u8 bit;
18 };
19
20 struct qcom_pdc_reset_data {
21         struct reset_controller_dev rcdev;
22         struct regmap *regmap;
23 };
24
25 static 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
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},
45 };
46
47 static 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
53 static 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
63 static 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
72 static const struct reset_control_ops qcom_pdc_reset_ops = {
73         .assert = qcom_pdc_control_assert,
74         .deassert = qcom_pdc_control_deassert,
75 };
76
77 static 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
108 static const struct of_device_id qcom_pdc_reset_of_match[] = {
109         { .compatible = "qcom,sdm845-pdc-global" },
110         {}
111 };
112 MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
113
114 static 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 };
121 module_platform_driver(qcom_pdc_reset_driver);
122
123 MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
124 MODULE_LICENSE("GPL v2");