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
17 struct qcom_pdc_reset_map {
18 u8 bit;
19 };
20
21 struct qcom_pdc_reset_desc {
22 const struct qcom_pdc_reset_map *resets;
23 size_t num_resets;
24 unsigned int offset;
25 };
26
27 struct qcom_pdc_reset_data {
28 struct reset_controller_dev rcdev;
29 struct regmap *regmap;
30 const struct qcom_pdc_reset_desc *desc;
31 };
32
33 static 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 .fast_io = true,
40 };
41
42 static const struct qcom_pdc_reset_map sdm845_pdc_resets[] = {
43 [PDC_APPS_SYNC_RESET] = {0},
44 [PDC_SP_SYNC_RESET] = {1},
45 [PDC_AUDIO_SYNC_RESET] = {2},
46 [PDC_SENSORS_SYNC_RESET] = {3},
47 [PDC_AOP_SYNC_RESET] = {4},
48 [PDC_DEBUG_SYNC_RESET] = {5},
49 [PDC_GPU_SYNC_RESET] = {6},
50 [PDC_DISPLAY_SYNC_RESET] = {7},
51 [PDC_COMPUTE_SYNC_RESET] = {8},
52 [PDC_MODEM_SYNC_RESET] = {9},
53 };
54
55 static const struct qcom_pdc_reset_desc sdm845_pdc_reset_desc = {
56 .resets = sdm845_pdc_resets,
57 .num_resets = ARRAY_SIZE(sdm845_pdc_resets),
58 .offset = RPMH_SDM845_PDC_SYNC_RESET,
59 };
60
61 static const struct qcom_pdc_reset_map sc7280_pdc_resets[] = {
62 [PDC_APPS_SYNC_RESET] = {0},
63 [PDC_SP_SYNC_RESET] = {1},
64 [PDC_AUDIO_SYNC_RESET] = {2},
65 [PDC_SENSORS_SYNC_RESET] = {3},
66 [PDC_AOP_SYNC_RESET] = {4},
67 [PDC_DEBUG_SYNC_RESET] = {5},
68 [PDC_GPU_SYNC_RESET] = {6},
69 [PDC_DISPLAY_SYNC_RESET] = {7},
70 [PDC_COMPUTE_SYNC_RESET] = {8},
71 [PDC_MODEM_SYNC_RESET] = {9},
72 [PDC_WLAN_RF_SYNC_RESET] = {10},
73 [PDC_WPSS_SYNC_RESET] = {11},
74 };
75
76 static const struct qcom_pdc_reset_desc sc7280_pdc_reset_desc = {
77 .resets = sc7280_pdc_resets,
78 .num_resets = ARRAY_SIZE(sc7280_pdc_resets),
79 .offset = RPMH_SC7280_PDC_SYNC_RESET,
80 };
81
to_qcom_pdc_reset_data(struct reset_controller_dev * rcdev)82 static inline struct qcom_pdc_reset_data *to_qcom_pdc_reset_data(
83 struct reset_controller_dev *rcdev)
84 {
85 return container_of(rcdev, struct qcom_pdc_reset_data, rcdev);
86 }
87
qcom_pdc_control_assert(struct reset_controller_dev * rcdev,unsigned long idx)88 static int qcom_pdc_control_assert(struct reset_controller_dev *rcdev,
89 unsigned long idx)
90 {
91 struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
92 u32 mask = BIT(data->desc->resets[idx].bit);
93
94 return regmap_update_bits(data->regmap, data->desc->offset, mask, mask);
95 }
96
qcom_pdc_control_deassert(struct reset_controller_dev * rcdev,unsigned long idx)97 static int qcom_pdc_control_deassert(struct reset_controller_dev *rcdev,
98 unsigned long idx)
99 {
100 struct qcom_pdc_reset_data *data = to_qcom_pdc_reset_data(rcdev);
101 u32 mask = BIT(data->desc->resets[idx].bit);
102
103 return regmap_update_bits(data->regmap, data->desc->offset, mask, 0);
104 }
105
106 static const struct reset_control_ops qcom_pdc_reset_ops = {
107 .assert = qcom_pdc_control_assert,
108 .deassert = qcom_pdc_control_deassert,
109 };
110
qcom_pdc_reset_probe(struct platform_device * pdev)111 static int qcom_pdc_reset_probe(struct platform_device *pdev)
112 {
113 const struct qcom_pdc_reset_desc *desc;
114 struct qcom_pdc_reset_data *data;
115 struct device *dev = &pdev->dev;
116 void __iomem *base;
117
118 desc = device_get_match_data(&pdev->dev);
119 if (!desc)
120 return -EINVAL;
121
122 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
123 if (!data)
124 return -ENOMEM;
125
126 data->desc = desc;
127 base = devm_platform_ioremap_resource(pdev, 0);
128 if (IS_ERR(base))
129 return PTR_ERR(base);
130
131 data->regmap = devm_regmap_init_mmio(dev, base, &pdc_regmap_config);
132 if (IS_ERR(data->regmap)) {
133 dev_err(dev, "Unable to initialize regmap\n");
134 return PTR_ERR(data->regmap);
135 }
136
137 data->rcdev.owner = THIS_MODULE;
138 data->rcdev.ops = &qcom_pdc_reset_ops;
139 data->rcdev.nr_resets = desc->num_resets;
140 data->rcdev.of_node = dev->of_node;
141
142 return devm_reset_controller_register(dev, &data->rcdev);
143 }
144
145 static const struct of_device_id qcom_pdc_reset_of_match[] = {
146 { .compatible = "qcom,sc7280-pdc-global", .data = &sc7280_pdc_reset_desc },
147 { .compatible = "qcom,sdm845-pdc-global", .data = &sdm845_pdc_reset_desc },
148 {}
149 };
150 MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
151
152 static struct platform_driver qcom_pdc_reset_driver = {
153 .probe = qcom_pdc_reset_probe,
154 .driver = {
155 .name = "qcom_pdc_reset",
156 .of_match_table = qcom_pdc_reset_of_match,
157 },
158 };
159 module_platform_driver(qcom_pdc_reset_driver);
160
161 MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
162 MODULE_LICENSE("GPL v2");
163