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1 | // SPDX-License-Identifier: GPL-2.0 |
2 | // | |
3eb8f765 | 3 | // reset-uniphier-glue.c - Glue layer reset driver for UniPhier |
499fef09 KH |
4 | // Copyright 2018 Socionext Inc. |
5 | // Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> | |
6 | ||
7 | #include <linux/clk.h> | |
8 | #include <linux/module.h> | |
bad8a8af | 9 | #include <linux/of.h> |
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10 | #include <linux/platform_device.h> |
11 | #include <linux/reset.h> | |
9357b046 | 12 | #include <linux/reset/reset-simple.h> |
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13 | |
14 | #define MAX_CLKS 2 | |
15 | #define MAX_RSTS 2 | |
16 | ||
3eb8f765 | 17 | struct uniphier_glue_reset_soc_data { |
499fef09 KH |
18 | int nclks; |
19 | const char * const *clock_names; | |
20 | int nrsts; | |
21 | const char * const *reset_names; | |
22 | }; | |
23 | ||
3eb8f765 | 24 | struct uniphier_glue_reset_priv { |
499fef09 | 25 | struct clk_bulk_data clk[MAX_CLKS]; |
176cae38 | 26 | struct reset_control_bulk_data rst[MAX_RSTS]; |
499fef09 | 27 | struct reset_simple_data rdata; |
3eb8f765 | 28 | const struct uniphier_glue_reset_soc_data *data; |
499fef09 KH |
29 | }; |
30 | ||
72bb7314 PZ |
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 | ||
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 | ||
3eb8f765 | 45 | static int uniphier_glue_reset_probe(struct platform_device *pdev) |
499fef09 KH |
46 | { |
47 | struct device *dev = &pdev->dev; | |
3eb8f765 | 48 | struct uniphier_glue_reset_priv *priv; |
499fef09 | 49 | struct resource *res; |
176cae38 | 50 | int i, ret; |
499fef09 KH |
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 | ||
c6454812 | 61 | priv->rdata.membase = devm_platform_get_and_ioremap_resource(pdev, 0, &res); |
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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 | ||
176cae38 PZ |
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; | |
499fef09 KH |
77 | |
78 | ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk); | |
79 | if (ret) | |
80 | return ret; | |
81 | ||
72bb7314 PZ |
82 | ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv); |
83 | if (ret) | |
84 | return ret; | |
85 | ||
176cae38 PZ |
86 | ret = reset_control_bulk_deassert(priv->data->nrsts, priv->rst); |
87 | if (ret) | |
72bb7314 PZ |
88 | return ret; |
89 | ||
90 | ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv); | |
91 | if (ret) | |
92 | return ret; | |
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93 | |
94 | spin_lock_init(&priv->rdata.lock); | |
95 | priv->rdata.rcdev.owner = THIS_MODULE; | |
3a2390c6 | 96 | priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE; |
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97 | priv->rdata.rcdev.ops = &reset_simple_ops; |
98 | priv->rdata.rcdev.of_node = dev->of_node; | |
99 | priv->rdata.active_low = true; | |
100 | ||
72bb7314 | 101 | return devm_reset_controller_register(dev, &priv->rdata.rcdev); |
499fef09 KH |
102 | } |
103 | ||
104 | static const char * const uniphier_pro4_clock_reset_names[] = { | |
105 | "gio", "link", | |
106 | }; | |
107 | ||
3eb8f765 | 108 | static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = { |
499fef09 KH |
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 | ||
3eb8f765 | 119 | static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = { |
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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 | ||
3eb8f765 | 126 | static const struct of_device_id uniphier_glue_reset_match[] = { |
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127 | { |
128 | .compatible = "socionext,uniphier-pro4-usb3-reset", | |
129 | .data = &uniphier_pro4_data, | |
130 | }, | |
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131 | { |
132 | .compatible = "socionext,uniphier-pro5-usb3-reset", | |
133 | .data = &uniphier_pro4_data, | |
134 | }, | |
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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 | }, | |
3440b8fa KH |
147 | { |
148 | .compatible = "socionext,uniphier-nx1-usb3-reset", | |
149 | .data = &uniphier_pxs2_data, | |
150 | }, | |
d0c2d210 KH |
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 | }, | |
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163 | { /* Sentinel */ } |
164 | }; | |
3eb8f765 | 165 | MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match); |
499fef09 | 166 | |
3eb8f765 KH |
167 | static struct platform_driver uniphier_glue_reset_driver = { |
168 | .probe = uniphier_glue_reset_probe, | |
499fef09 | 169 | .driver = { |
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170 | .name = "uniphier-glue-reset", |
171 | .of_match_table = uniphier_glue_reset_match, | |
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172 | }, |
173 | }; | |
3eb8f765 | 174 | module_platform_driver(uniphier_glue_reset_driver); |
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175 | |
176 | MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>"); | |
3eb8f765 | 177 | MODULE_DESCRIPTION("UniPhier Glue layer reset driver"); |
499fef09 | 178 | MODULE_LICENSE("GPL"); |