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 | |
31 | static void uniphier_clk_disable(void *_priv) |
32 | { |
33 | struct uniphier_glue_reset_priv *priv = _priv; |
34 | |
35 | clk_bulk_disable_unprepare(num_clks: priv->data->nclks, clks: 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(num_rstcs: priv->data->nrsts, rstcs: priv->rst); |
43 | } |
44 | |
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, size: 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 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
62 | priv->rdata.membase = devm_ioremap_resource(dev, res); |
63 | if (IS_ERR(ptr: priv->rdata.membase)) |
64 | return PTR_ERR(ptr: priv->rdata.membase); |
65 | |
66 | for (i = 0; i < priv->data->nclks; i++) |
67 | priv->clk[i].id = priv->data->clock_names[i]; |
68 | ret = devm_clk_bulk_get(dev, num_clks: priv->data->nclks, clks: priv->clk); |
69 | if (ret) |
70 | return ret; |
71 | |
72 | for (i = 0; i < priv->data->nrsts; i++) |
73 | priv->rst[i].id = priv->data->reset_names[i]; |
74 | ret = devm_reset_control_bulk_get_shared(dev, num_rstcs: priv->data->nrsts, |
75 | rstcs: priv->rst); |
76 | if (ret) |
77 | return ret; |
78 | |
79 | ret = clk_bulk_prepare_enable(num_clks: priv->data->nclks, clks: priv->clk); |
80 | if (ret) |
81 | return ret; |
82 | |
83 | ret = devm_add_action_or_reset(dev, uniphier_clk_disable, priv); |
84 | if (ret) |
85 | return ret; |
86 | |
87 | ret = reset_control_bulk_deassert(num_rstcs: priv->data->nrsts, rstcs: priv->rst); |
88 | if (ret) |
89 | return ret; |
90 | |
91 | ret = devm_add_action_or_reset(dev, uniphier_rst_assert, priv); |
92 | if (ret) |
93 | return ret; |
94 | |
95 | spin_lock_init(&priv->rdata.lock); |
96 | priv->rdata.rcdev.owner = THIS_MODULE; |
97 | priv->rdata.rcdev.nr_resets = resource_size(res) * BITS_PER_BYTE; |
98 | priv->rdata.rcdev.ops = &reset_simple_ops; |
99 | priv->rdata.rcdev.of_node = dev->of_node; |
100 | priv->rdata.active_low = true; |
101 | |
102 | return devm_reset_controller_register(dev, rcdev: &priv->rdata.rcdev); |
103 | } |
104 | |
105 | static const char * const uniphier_pro4_clock_reset_names[] = { |
106 | "gio" , "link" , |
107 | }; |
108 | |
109 | static const struct uniphier_glue_reset_soc_data uniphier_pro4_data = { |
110 | .nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names), |
111 | .clock_names = uniphier_pro4_clock_reset_names, |
112 | .nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names), |
113 | .reset_names = uniphier_pro4_clock_reset_names, |
114 | }; |
115 | |
116 | static const char * const uniphier_pxs2_clock_reset_names[] = { |
117 | "link" , |
118 | }; |
119 | |
120 | static const struct uniphier_glue_reset_soc_data uniphier_pxs2_data = { |
121 | .nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), |
122 | .clock_names = uniphier_pxs2_clock_reset_names, |
123 | .nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names), |
124 | .reset_names = uniphier_pxs2_clock_reset_names, |
125 | }; |
126 | |
127 | static const struct of_device_id uniphier_glue_reset_match[] = { |
128 | { |
129 | .compatible = "socionext,uniphier-pro4-usb3-reset" , |
130 | .data = &uniphier_pro4_data, |
131 | }, |
132 | { |
133 | .compatible = "socionext,uniphier-pro5-usb3-reset" , |
134 | .data = &uniphier_pro4_data, |
135 | }, |
136 | { |
137 | .compatible = "socionext,uniphier-pxs2-usb3-reset" , |
138 | .data = &uniphier_pxs2_data, |
139 | }, |
140 | { |
141 | .compatible = "socionext,uniphier-ld20-usb3-reset" , |
142 | .data = &uniphier_pxs2_data, |
143 | }, |
144 | { |
145 | .compatible = "socionext,uniphier-pxs3-usb3-reset" , |
146 | .data = &uniphier_pxs2_data, |
147 | }, |
148 | { |
149 | .compatible = "socionext,uniphier-nx1-usb3-reset" , |
150 | .data = &uniphier_pxs2_data, |
151 | }, |
152 | { |
153 | .compatible = "socionext,uniphier-pro4-ahci-reset" , |
154 | .data = &uniphier_pro4_data, |
155 | }, |
156 | { |
157 | .compatible = "socionext,uniphier-pxs2-ahci-reset" , |
158 | .data = &uniphier_pxs2_data, |
159 | }, |
160 | { |
161 | .compatible = "socionext,uniphier-pxs3-ahci-reset" , |
162 | .data = &uniphier_pxs2_data, |
163 | }, |
164 | { /* Sentinel */ } |
165 | }; |
166 | MODULE_DEVICE_TABLE(of, uniphier_glue_reset_match); |
167 | |
168 | static struct platform_driver uniphier_glue_reset_driver = { |
169 | .probe = uniphier_glue_reset_probe, |
170 | .driver = { |
171 | .name = "uniphier-glue-reset" , |
172 | .of_match_table = uniphier_glue_reset_match, |
173 | }, |
174 | }; |
175 | module_platform_driver(uniphier_glue_reset_driver); |
176 | |
177 | MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>" ); |
178 | MODULE_DESCRIPTION("UniPhier Glue layer reset driver" ); |
179 | MODULE_LICENSE("GPL" ); |
180 | |