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_device.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 resource_size_t size;
51 int i, ret;
52
53 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
54 if (!priv)
55 return -ENOMEM;
56
57 priv->data = of_device_get_match_data(dev);
58 if (WARN_ON(!priv->data || priv->data->nclks > MAX_CLKS ||
59 priv->data->nrsts > MAX_RSTS))
60 return -EINVAL;
61
62 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
63 size = resource_size(res);
64 priv->rdata.membase = devm_ioremap_resource(dev, res);
65 if (IS_ERR(priv->rdata.membase))
66 return PTR_ERR(priv->rdata.membase);
67
68 for (i = 0; i < priv->data->nclks; i++)
69 priv->clk[i].id = priv->data->clock_names[i];
70 ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
71 if (ret)
72 return ret;
73
74 for (i = 0; i < priv->data->nrsts; i++)
75 priv->rst[i].id = priv->data->reset_names[i];
76 ret = devm_reset_control_bulk_get_shared(dev, priv->data->nrsts,
77 priv->rst);
78 if (ret)
79 return ret;
80
81 ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
82 if (ret)
83 return ret;
84
85 ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv);
86 if (ret)
87 return ret;
88
89 ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst);
90 if (ret)
91 return ret;
92
93 ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv);
94 if (ret)
95 return ret;
96
97 spin_lock_init(&priv->rdata.lock);
98 priv->rdata.rcdev.owner = THIS_MODULE;
99 priv->rdata.rcdev.nr_resets = size * BITS_PER_BYTE;
100 priv->rdata.rcdev.ops = &reset_simple_ops;
101 priv->rdata.rcdev.of_node = dev->of_node;
102 priv->rdata.active_low = true;
103
104 platform_set_drvdata(pdev, priv);
105
106 return devm_reset_controller_register(dev, &priv->rdata.rcdev);
107 }
108
109 static const char * const uniphier_pro4_clock_reset_names[] = {
110 "gio", "link",
111 };
112
113 static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = {
114 .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
115 .clock_names = uniphier_pro4_clock_reset_names,
116 .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
117 .reset_names = uniphier_pro4_clock_reset_names,
118 };
119
120 static const char * const uniphier_pxs2_clock_reset_names[] = {
121 "link",
122 };
123
124 static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = {
125 .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
126 .clock_names = uniphier_pxs2_clock_reset_names,
127 .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
128 .reset_names = uniphier_pxs2_clock_reset_names,
129 };
130
131 static const struct of_device_id uniphier_glue_reset_match[] = {
132 {
133 .compatible = "socionext,uniphier-pro4-usb3-reset",
134 .data = &uniphier_pro4_data,
135 },
136 {
137 .compatible = "socionext,uniphier-pro5-usb3-reset",
138 .data = &uniphier_pro4_data,
139 },
140 {
141 .compatible = "socionext,uniphier-pxs2-usb3-reset",
142 .data = &uniphier_pxs2_data,
143 },
144 {
145 .compatible = "socionext,uniphier-ld20-usb3-reset",
146 .data = &uniphier_pxs2_data,
147 },
148 {
149 .compatible = "socionext,uniphier-pxs3-usb3-reset",
150 .data = &uniphier_pxs2_data,
151 },
152 {
153 .compatible = "socionext,uniphier-nx1-usb3-reset",
154 .data = &uniphier_pxs2_data,
155 },
156 {
157 .compatible = "socionext,uniphier-pro4-ahci-reset",
158 .data = &uniphier_pro4_data,
159 },
160 {
161 .compatible = "socionext,uniphier-pxs2-ahci-reset",
162 .data = &uniphier_pxs2_data,
163 },
164 {
165 .compatible = "socionext,uniphier-pxs3-ahci-reset",
166 .data = &uniphier_pxs2_data,
167 },
168 { /* Sentinel */ }
169 };
170 MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match);
171
172 static struct platform_driver uniphier_glue_reset_driver = {
173 .probe = uniphier_glue_reset_probe,
174 .driver = {
175 .name = "uniphier-glue-reset",
176 .of_match_table = uniphier_glue_reset_match,
177 },
178 };
179 module_platform_driver(uniphier_glue_reset_driver);
180
181 MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
182 MODULE_DESCRIPTION("UniPhier Glue layer reset driver");
183 MODULE_LICENSE("GPL");
184
