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 | #define VERSAL_NR_RESETS 95 |
16 | #define VERSAL_NET_NR_RESETS 176 |
17 | |
18 | struct zynqmp_reset_soc_data { |
19 | u32 reset_id; |
20 | u32 num_resets; |
21 | }; |
22 | |
23 | struct zynqmp_reset_data { |
24 | struct reset_controller_dev rcdev; |
25 | const struct zynqmp_reset_soc_data *data; |
26 | }; |
27 | |
28 | static inline struct zynqmp_reset_data * |
29 | to_zynqmp_reset_data(struct reset_controller_dev *rcdev) |
30 | { |
31 | return container_of(rcdev, struct zynqmp_reset_data, rcdev); |
32 | } |
33 | |
34 | static 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(reset: priv->data->reset_id + id, |
40 | assert_flag: PM_RESET_ACTION_ASSERT); |
41 | } |
42 | |
43 | static 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(reset: priv->data->reset_id + id, |
49 | assert_flag: PM_RESET_ACTION_RELEASE); |
50 | } |
51 | |
52 | static 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 err; |
57 | u32 val; |
58 | |
59 | err = zynqmp_pm_reset_get_status(reset: priv->data->reset_id + id, status: &val); |
60 | if (err) |
61 | return err; |
62 | |
63 | return val; |
64 | } |
65 | |
66 | static int zynqmp_reset_reset(struct reset_controller_dev *rcdev, |
67 | unsigned long id) |
68 | { |
69 | struct zynqmp_reset_data *priv = to_zynqmp_reset_data(rcdev); |
70 | |
71 | return zynqmp_pm_reset_assert(reset: priv->data->reset_id + id, |
72 | assert_flag: PM_RESET_ACTION_PULSE); |
73 | } |
74 | |
75 | static int zynqmp_reset_of_xlate(struct reset_controller_dev *rcdev, |
76 | const struct of_phandle_args *reset_spec) |
77 | { |
78 | return reset_spec->args[0]; |
79 | } |
80 | |
81 | static const struct zynqmp_reset_soc_data zynqmp_reset_data = { |
82 | .reset_id = ZYNQMP_RESET_ID, |
83 | .num_resets = ZYNQMP_NR_RESETS, |
84 | }; |
85 | |
86 | static const struct zynqmp_reset_soc_data versal_reset_data = { |
87 | .reset_id = 0, |
88 | .num_resets = VERSAL_NR_RESETS, |
89 | }; |
90 | |
91 | static const struct zynqmp_reset_soc_data versal_net_reset_data = { |
92 | .reset_id = 0, |
93 | .num_resets = VERSAL_NET_NR_RESETS, |
94 | }; |
95 | |
96 | static const struct reset_control_ops zynqmp_reset_ops = { |
97 | .reset = zynqmp_reset_reset, |
98 | .assert = zynqmp_reset_assert, |
99 | .deassert = zynqmp_reset_deassert, |
100 | .status = zynqmp_reset_status, |
101 | }; |
102 | |
103 | static int zynqmp_reset_probe(struct platform_device *pdev) |
104 | { |
105 | struct zynqmp_reset_data *priv; |
106 | |
107 | priv = devm_kzalloc(dev: &pdev->dev, size: sizeof(*priv), GFP_KERNEL); |
108 | if (!priv) |
109 | return -ENOMEM; |
110 | |
111 | priv->data = of_device_get_match_data(dev: &pdev->dev); |
112 | if (!priv->data) |
113 | return -EINVAL; |
114 | |
115 | priv->rcdev.ops = &zynqmp_reset_ops; |
116 | priv->rcdev.owner = THIS_MODULE; |
117 | priv->rcdev.of_node = pdev->dev.of_node; |
118 | priv->rcdev.nr_resets = priv->data->num_resets; |
119 | priv->rcdev.of_reset_n_cells = 1; |
120 | priv->rcdev.of_xlate = zynqmp_reset_of_xlate; |
121 | |
122 | return devm_reset_controller_register(dev: &pdev->dev, rcdev: &priv->rcdev); |
123 | } |
124 | |
125 | static const struct of_device_id zynqmp_reset_dt_ids[] = { |
126 | { .compatible = "xlnx,zynqmp-reset" , .data = &zynqmp_reset_data, }, |
127 | { .compatible = "xlnx,versal-reset" , .data = &versal_reset_data, }, |
128 | { .compatible = "xlnx,versal-net-reset" , .data = &versal_net_reset_data, }, |
129 | { /* sentinel */ }, |
130 | }; |
131 | |
132 | static struct platform_driver zynqmp_reset_driver = { |
133 | .probe = zynqmp_reset_probe, |
134 | .driver = { |
135 | .name = KBUILD_MODNAME, |
136 | .of_match_table = zynqmp_reset_dt_ids, |
137 | }, |
138 | }; |
139 | |
140 | static int __init zynqmp_reset_init(void) |
141 | { |
142 | return platform_driver_register(&zynqmp_reset_driver); |
143 | } |
144 | |
145 | arch_initcall(zynqmp_reset_init); |
146 | |