1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // reset-uniphier-glue.c - Glue layer reset driver for UniPhier
4 // Copyright 2018 Socionext Inc.
5 // Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
6
7 #include <linux/clk.h>
8 #include <linux/module.h>
9 #include <linux/of.h>
10 #include <linux/platform_device.h>
11 #include <linux/reset.h>
12 #include <linux/reset/reset-simple.h>
13
14 #define MAX_CLKS 2
15 #define MAX_RSTS 2
16
17 struct uniphier_glue_reset_soc_data {
18 int nclks;
19 const char * const *clock_names;
20 int nrsts;
21 const char * const *reset_names;
22 };
23
24 struct uniphier_glue_reset_priv {
25 struct clk_bulk_data clk[MAX_CLKS];
26 struct reset_control_bulk_data rst[MAX_RSTS];
27 struct reset_simple_data rdata;
28 const struct uniphier_glue_reset_soc_data *data;
29 };
30
uniphier_clk_disable(void * _priv)31 static void uniphier_clk_disable(void *_priv)
32 {
33 struct uniphier_glue_reset_priv *priv = _priv;
34
35 clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);
36 }
37
uniphier_rst_assert(void * _priv)38 static void uniphier_rst_assert(void *_priv)
39 {
40 struct uniphier_glue_reset_priv *priv = _priv;
41
42 reset_control_bulk_assert(priv->data->nrsts, priv->rst);
43 }
44
uniphier_glue_reset_probe(struct platform_device * pdev)45 static int uniphier_glue_reset_probe(struct platform_device *pdev)
46 {
47 struct device *dev = &pdev->dev;
48 struct uniphier_glue_reset_priv *priv;
49 struct resource *res;
50 int i, ret;
51
52 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
53 if (!priv)
54 return -ENOMEM;
55
56 priv->data = of_device_get_match_data(dev);
57 if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS ||
58 priv->data->nrsts > MAX_RSTS))
59 return -EINVAL;
60
61 priv->rdata.membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
62 if (IS_ERR(priv->rdata.membase))
63 return PTR_ERR(priv->rdata.membase);
64
65 for (i = 0; i < priv->data->nclks; i++)
66 priv->clk[i].id = priv->data->clock_names[i];
67 ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
68 if (ret)
69 return ret;
70
71 for (i = 0; i < priv->data->nrsts; i++)
72 priv->rst[i].id = priv->data->reset_names[i];
73 ret = devm_reset_control_bulk_get_shared(dev, priv->data->nrsts,
74 priv->rst);
75 if (ret)
76 return ret;
77
78 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
79 if (ret)
80 return ret;
81
82 ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv);
83 if (ret)
84 return ret;
85
86 ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst);
87 if (ret)
88 return ret;
89
90 ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv);
91 if (ret)
92 return ret;
93
94 spin_lock_init(&priv->rdata.lock);
95 priv->rdata.rcdev.owner = THIS_MODULE;
96 priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE;
97 priv->rdata.rcdev.ops = &reset_simple_ops;
98 priv->rdata.rcdev.of_node = dev->of_node;
99 priv->rdata.active_low = true;
100
101 return devm_reset_controller_register(dev, &priv->rdata.rcdev);
102 }
103
104 static const char * const uniphier_pro4_clock_reset_names[] = {
105 "gio", "link",
106 };
107
108 static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = {
109 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
110 .clock_names = uniphier_pro4_clock_reset_names,
111 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
112 .reset_names = uniphier_pro4_clock_reset_names,
113 };
114
115 static const char * const uniphier_pxs2_clock_reset_names[] = {
116 "link",
117 };
118
119 static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = {
120 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
121 .clock_names = uniphier_pxs2_clock_reset_names,
122 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
123 .reset_names = uniphier_pxs2_clock_reset_names,
124 };
125
126 static const struct of_device_id uniphier_glue_reset_match[] = {
127 {
128 .compatible = "socionext,uniphier-pro4-usb3-reset",
129 .data = &uniphier_pro4_data,
130 },
131 {
132 .compatible = "socionext,uniphier-pro5-usb3-reset",
133 .data = &uniphier_pro4_data,
134 },
135 {
136 .compatible = "socionext,uniphier-pxs2-usb3-reset",
137 .data = &uniphier_pxs2_data,
138 },
139 {
140 .compatible = "socionext,uniphier-ld20-usb3-reset",
141 .data = &uniphier_pxs2_data,
142 },
143 {
144 .compatible = "socionext,uniphier-pxs3-usb3-reset",
145 .data = &uniphier_pxs2_data,
146 },
147 {
148 .compatible = "socionext,uniphier-nx1-usb3-reset",
149 .data = &uniphier_pxs2_data,
150 },
151 {
152 .compatible = "socionext,uniphier-pro4-ahci-reset",
153 .data = &uniphier_pro4_data,
154 },
155 {
156 .compatible = "socionext,uniphier-pxs2-ahci-reset",
157 .data = &uniphier_pxs2_data,
158 },
159 {
160 .compatible = "socionext,uniphier-pxs3-ahci-reset",
161 .data = &uniphier_pxs2_data,
162 },
163 { /* Sentinel */ }
164 };
165 MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match);
166
167 static struct platform_driver uniphier_glue_reset_driver = {
168 .probe = uniphier_glue_reset_probe,
169 .driver = {
170 .name = "uniphier-glue-reset",
171 .of_match_table = uniphier_glue_reset_match,
172 },
173 };
174 module_platform_driver(uniphier_glue_reset_driver);
175
176 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
177 MODULE_DESCRIPTION("UniPhier Glue layer reset driver");
178 MODULE_LICENSE("GPL");
179