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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
16struct qcom_pdc_reset_map {
17 u8 bit;
18};
19
20struct qcom_pdc_reset_data {
21 struct reset_controller_dev rcdev;
22 struct regmap *regmap;
23};
24
25static 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
34static 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
47static 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
53static 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
63static 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
72static const struct reset_control_ops qcom_pdc_reset_ops = {
73 .assert = qcom_pdc_control_assert,
74 .deassert = qcom_pdc_control_deassert,
75};
76
77static 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
108static const struct of_device_id qcom_pdc_reset_of_match[] = {
109 { .compatible = "qcom,sdm845-pdc-global" },
110 {}
111};
112MODULE_DEVICE_TABLE(of, qcom_pdc_reset_of_match);
113
114static 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};
121module_platform_driver(qcom_pdc_reset_driver);
122
123MODULE_DESCRIPTION("Qualcomm PDC Reset Driver");
124MODULE_LICENSE("GPL v2");
125
