GNU Linux-libre 5.19-rc6-gnu
[releases.git] / drivers / reset / reset-qcom-aoss.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/platform_device.h>
8 #include <linux/reset-controller.h>
9 #include <linux/delay.h>
10 #include <linux/io.h>
11 #include <linux/of_device.h>
12 #include <dt-bindings/reset/qcom,sdm845-aoss.h>
13
14 struct qcom_aoss_reset_map {
15         unsigned int reg;
16 };
17
18 struct qcom_aoss_desc {
19         const struct qcom_aoss_reset_map *resets;
20         size_t num_resets;
21 };
22
23 struct qcom_aoss_reset_data {
24         struct reset_controller_dev rcdev;
25         void __iomem *base;
26         const struct qcom_aoss_desc *desc;
27 };
28
29 static const struct qcom_aoss_reset_map sdm845_aoss_resets[] = {
30         [AOSS_CC_MSS_RESTART] = {0x10000},
31         [AOSS_CC_CAMSS_RESTART] = {0x11000},
32         [AOSS_CC_VENUS_RESTART] = {0x12000},
33         [AOSS_CC_GPU_RESTART] = {0x13000},
34         [AOSS_CC_DISPSS_RESTART] = {0x14000},
35         [AOSS_CC_WCSS_RESTART] = {0x20000},
36         [AOSS_CC_LPASS_RESTART] = {0x30000},
37 };
38
39 static const struct qcom_aoss_desc sdm845_aoss_desc = {
40         .resets = sdm845_aoss_resets,
41         .num_resets = ARRAY_SIZE(sdm845_aoss_resets),
42 };
43
44 static inline struct qcom_aoss_reset_data *to_qcom_aoss_reset_data(
45                                 struct reset_controller_dev *rcdev)
46 {
47         return container_of(rcdev, struct qcom_aoss_reset_data, rcdev);
48 }
49
50 static int qcom_aoss_control_assert(struct reset_controller_dev *rcdev,
51                                     unsigned long idx)
52 {
53         struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
54         const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
55
56         writel(1, data->base + map->reg);
57         /* Wait 6 32kHz sleep cycles for reset */
58         usleep_range(200, 300);
59         return 0;
60 }
61
62 static int qcom_aoss_control_deassert(struct reset_controller_dev *rcdev,
63                                       unsigned long idx)
64 {
65         struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
66         const struct qcom_aoss_reset_map *map = &data->desc->resets[idx];
67
68         writel(0, data->base + map->reg);
69         /* Wait 6 32kHz sleep cycles for reset */
70         usleep_range(200, 300);
71         return 0;
72 }
73
74 static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev,
75                                         unsigned long idx)
76 {
77         qcom_aoss_control_assert(rcdev, idx);
78
79         return qcom_aoss_control_deassert(rcdev, idx);
80 }
81
82 static const struct reset_control_ops qcom_aoss_reset_ops = {
83         .reset = qcom_aoss_control_reset,
84         .assert = qcom_aoss_control_assert,
85         .deassert = qcom_aoss_control_deassert,
86 };
87
88 static int qcom_aoss_reset_probe(struct platform_device *pdev)
89 {
90         struct qcom_aoss_reset_data *data;
91         struct device *dev = &pdev->dev;
92         const struct qcom_aoss_desc *desc;
93         struct resource *res;
94
95         desc = of_device_get_match_data(dev);
96         if (!desc)
97                 return -EINVAL;
98
99         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
100         if (!data)
101                 return -ENOMEM;
102
103         data->desc = desc;
104         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
105         data->base = devm_ioremap_resource(dev, res);
106         if (IS_ERR(data->base))
107                 return PTR_ERR(data->base);
108
109         data->rcdev.owner = THIS_MODULE;
110         data->rcdev.ops = &qcom_aoss_reset_ops;
111         data->rcdev.nr_resets = desc->num_resets;
112         data->rcdev.of_node = dev->of_node;
113
114         return devm_reset_controller_register(dev, &data->rcdev);
115 }
116
117 static const struct of_device_id qcom_aoss_reset_of_match[] = {
118         { .compatible = "qcom,sdm845-aoss-cc", .data = &sdm845_aoss_desc },
119         {}
120 };
121 MODULE_DEVICE_TABLE(of, qcom_aoss_reset_of_match);
122
123 static struct platform_driver qcom_aoss_reset_driver = {
124         .probe = qcom_aoss_reset_probe,
125         .driver  = {
126                 .name = "qcom_aoss_reset",
127                 .of_match_table = qcom_aoss_reset_of_match,
128         },
129 };
130
131 module_platform_driver(qcom_aoss_reset_driver);
132
133 MODULE_DESCRIPTION("Qualcomm AOSS Reset Driver");
134 MODULE_LICENSE("GPL v2");