tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/of_device.h>
13
14#define ZYNQMP_NR_RESETS (ZYNQMP_PM_RESET_END - ZYNQMP_PM_RESET_START)
15#define ZYNQMP_RESET_ID ZYNQMP_PM_RESET_START
16#define VERSAL_NR_RESETS 95
17
18struct zynqmp_reset_soc_data {
19 u32 reset_id;
20 u32 num_resets;
21};
22
23struct zynqmp_reset_data {
24 struct reset_controller_dev rcdev;
25 const struct zynqmp_reset_soc_data *data;
26};
27
28static inline struct zynqmp_reset_data *
29to_zynqmp_reset_data(struct reset_controller_dev *rcdev)
30{
31 return container_of(rcdev, struct zynqmp_reset_data, rcdev);
32}
33
34static int zynqmp_reset_assert(struct reset_controller_dev *rcdev,
35 unsigned long id)
36{
37 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
38
39 return zynqmp_pm_reset_assert(priv->data->reset_id + id,
40 PM_RESET_ACTION_ASSERT);
41}
42
43static int zynqmp_reset_deassert(struct reset_controller_dev *rcdev,
44 unsigned long id)
45{
46 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
47
48 return zynqmp_pm_reset_assert(priv->data->reset_id + id,
49 PM_RESET_ACTION_RELEASE);
50}
51
52static int zynqmp_reset_status(struct reset_controller_dev *rcdev,
53 unsigned long id)
54{
55 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
56 int val, err;
57
58 err = zynqmp_pm_reset_get_status(priv->data->reset_id + id, &val);
59 if (err)
60 return err;
61
62 return val;
63}
64
65static int zynqmp_reset_reset(struct reset_controller_dev *rcdev,
66 unsigned long id)
67{
68 struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev);
69
70 return zynqmp_pm_reset_assert(priv->data->reset_id + id,
71 PM_RESET_ACTION_PULSE);
72}
73
74static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev,
75 const struct of_phandle_args *reset_spec)
76{
77 return reset_spec->args[0];
78}
79
80static const struct zynqmp_reset_soc_data zynqmp_reset_data = {
81 .reset_id = ZYNQMP_RESET_ID,
82 .num_resets = ZYNQMP_NR_RESETS,
83};
84
85static const struct zynqmp_reset_soc_data versal_reset_data = {
86 .reset_id = 0,
87 .num_resets = VERSAL_NR_RESETS,
88};
89
90static const struct reset_control_ops zynqmp_reset_ops = {
91 .reset = zynqmp_reset_reset,
92 .assert = zynqmp_reset_assert,
93 .deassert = zynqmp_reset_deassert,
94 .status = zynqmp_reset_status,
95};
96
97static int zynqmp_reset_probe(struct platform_device *pdev)
98{
99 struct zynqmp_reset_data *priv;
100
101 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
102 if (!priv)
103 return -ENOMEM;
104
105 priv->data = of_device_get_match_data(&pdev->dev);
106 if (!priv->data)
107 return -EINVAL;
108
109 platform_set_drvdata(pdev, priv);
110
111 priv->rcdev.ops = &zynqmp_reset_ops;
112 priv->rcdev.owner = THIS_MODULE;
113 priv->rcdev.of_node = pdev->dev.of_node;
114 priv->rcdev.nr_resets = priv->data->num_resets;
115 priv->rcdev.of_reset_n_cells = 1;
116 priv->rcdev.of_xlate = zynqmp_reset_of_xlate;
117
118 return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
119}
120
121static const struct of_device_id zynqmp_reset_dt_ids[] = {
122 { .compatible = "xlnx,zynqmp-reset", .data = &zynqmp_reset_data, },
123 { .compatible = "xlnx,versal-reset", .data = &versal_reset_data, },
124 { /* sentinel */ },
125};
126
127static struct platform_driver zynqmp_reset_driver = {
128 .probe = zynqmp_reset_probe,
129 .driver = {
130 .name = KBUILD_MODNAME,
131 .of_match_table = zynqmp_reset_dt_ids,
132 },
133};
134
135static int __init zynqmp_reset_init(void)
136{
137 return platform_driver_register(&zynqmp_reset_driver);
138}
139
140arch_initcall(zynqmp_reset_init);