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1 | // SPDX-License-Identifier: GPL-2.0+ |
2 | /* | |
3 | * Copyright (C) 2018 Xilinx, Inc. | |
4 | * | |
5 | */ | |
6 | ||
7 | #include <linux/err.h> | |
8 | #include <linux/of.h> | |
9 | #include <linux/platform_device.h> | |
10 | #include <linux/reset-controller.h> | |
11 | #include <linux/firmware/xlnx-zynqmp.h> | |
12 | ||
13 | #define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START) | |
14 | #define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START | |
15 | ||
16 | struct zynqmp_reset_data { | |
17 | struct reset_controller_dev rcdev; | |
18 | const struct zynqmp_eemi_ops *eemi_ops; | |
19 | }; | |
20 | ||
21 | static inline struct zynqmp_reset_data * | |
22 | to_zynqmp_reset_data(struct reset_controller_dev *rcdev) | |
23 | { | |
24 | return container_of(rcdev, struct zynqmp_reset_data, rcdev); | |
25 | } | |
26 | ||
27 | static int zynqmp_reset_assert(struct reset_controller_dev *rcdev, | |
28 | unsigned long id) | |
29 | { | |
30 | struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); | |
31 | ||
32 | return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id, | |
33 | PM_RESET_ACTION_ASSERT); | |
34 | } | |
35 | ||
36 | static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev, | |
37 | unsigned long id) | |
38 | { | |
39 | struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); | |
40 | ||
41 | return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id, | |
42 | PM_RESET_ACTION_RELEASE); | |
43 | } | |
44 | ||
45 | static int zynqmp_reset_status(struct reset_controller_dev *rcdev, | |
46 | unsigned long id) | |
47 | { | |
48 | struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); | |
49 | int val, err; | |
50 | ||
51 | err = priv->eemi_ops->reset_get_status(ZYNQMP_RESET_ID + id, &val); | |
52 | if (err) | |
53 | return err; | |
54 | ||
55 | return val; | |
56 | } | |
57 | ||
58 | static int zynqmp_reset_reset(struct reset_controller_dev *rcdev, | |
59 | unsigned long id) | |
60 | { | |
61 | struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); | |
62 | ||
63 | return priv->eemi_ops->reset_assert(ZYNQMP_RESET_ID + id, | |
64 | PM_RESET_ACTION_PULSE); | |
65 | } | |
66 | ||
67 | static struct reset_control_ops zynqmp_reset_ops = { | |
68 | .reset = zynqmp_reset_reset, | |
69 | .assert = zynqmp_reset_assert, | |
70 | .deassert = zynqmp_reset_deassert, | |
71 | .status = zynqmp_reset_status, | |
72 | }; | |
73 | ||
74 | static int zynqmp_reset_probe(struct platform_device *pdev) | |
75 | { | |
76 | struct zynqmp_reset_data *priv; | |
77 | ||
78 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); | |
79 | if (!priv) | |
80 | return -ENOMEM; | |
81 | ||
62f0d7dc | 82 | priv->eemi_ops = zynqmp_pm_get_eemi_ops(); |
3d031378 RV |
83 | if (IS_ERR(priv->eemi_ops)) |
84 | return PTR_ERR(priv->eemi_ops); | |
85 | ||
86 | platform_set_drvdata(pdev, priv); | |
62f0d7dc NM |
87 | |
88 | priv->rcdev.ops = &zynqmp_reset_ops; | |
89 | priv->rcdev.owner = THIS_MODULE; | |
90 | priv->rcdev.of_node = pdev->dev.of_node; | |
91 | priv->rcdev.nr_resets = ZYNQMP_NR_RESETS; | |
92 | ||
93 | return devm_reset_controller_register(&pdev->dev, &priv->rcdev); | |
94 | } | |
95 | ||
96 | static const struct of_device_id zynqmp_reset_dt_ids[] = { | |
97 | { .compatible = "xlnx,zynqmp-reset", }, | |
98 | { /* sentinel */ }, | |
99 | }; | |
100 | ||
101 | static struct platform_driver zynqmp_reset_driver = { | |
102 | .probe = zynqmp_reset_probe, | |
103 | .driver = { | |
104 | .name = KBUILD_MODNAME, | |
105 | .of_match_table = zynqmp_reset_dt_ids, | |
106 | }, | |
107 | }; | |
108 | ||
109 | static int __init zynqmp_reset_init(void) | |
110 | { | |
111 | return platform_driver_register(&zynqmp_reset_driver); | |
112 | } | |
113 | ||
114 | arch_initcall(zynqmp_reset_init); |