1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2016 Socionext Inc.
4  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
5  */
6 
7 #include <linux/clk-provider.h>
8 #include <linux/init.h>
9 #include <linux/mfd/syscon.h>
10 #include <linux/of.h>
11 #include <linux/of_device.h>
12 #include <linux/platform_device.h>
13 
14 #include "clk-uniphier.h"
15 
uniphier_clk_register(struct device * dev,struct regmap * regmap,const struct uniphier_clk_data * data)16 static struct clk_hw *uniphier_clk_register(struct device *dev,
17 					    struct regmap *regmap,
18 					const struct uniphier_clk_data *data)
19 {
20 	switch (data->type) {
21 	case UNIPHIER_CLK_TYPE_CPUGEAR:
22 		return uniphier_clk_register_cpugear(dev, regmap, data->name,
23 						     &data->data.cpugear);
24 	case UNIPHIER_CLK_TYPE_FIXED_FACTOR:
25 		return uniphier_clk_register_fixed_factor(dev, data->name,
26 							  &data->data.factor);
27 	case UNIPHIER_CLK_TYPE_FIXED_RATE:
28 		return uniphier_clk_register_fixed_rate(dev, data->name,
29 							&data->data.rate);
30 	case UNIPHIER_CLK_TYPE_GATE:
31 		return uniphier_clk_register_gate(dev, regmap, data->name,
32 						  &data->data.gate);
33 	case UNIPHIER_CLK_TYPE_MUX:
34 		return uniphier_clk_register_mux(dev, regmap, data->name,
35 						 &data->data.mux);
36 	default:
37 		dev_err(dev, "unsupported clock type\n");
38 		return ERR_PTR(-EINVAL);
39 	}
40 }
41 
uniphier_clk_probe(struct platform_device * pdev)42 static int uniphier_clk_probe(struct platform_device *pdev)
43 {
44 	struct device *dev = &pdev->dev;
45 	struct clk_hw_onecell_data *hw_data;
46 	const struct uniphier_clk_data *p, *data;
47 	struct regmap *regmap;
48 	struct device_node *parent;
49 	int clk_num = 0;
50 
51 	data = of_device_get_match_data(dev);
52 	if (WARN_ON(!data))
53 		return -EINVAL;
54 
55 	parent = of_get_parent(dev->of_node); /* parent should be syscon node */
56 	regmap = syscon_node_to_regmap(parent);
57 	of_node_put(parent);
58 	if (IS_ERR(regmap)) {
59 		dev_err(dev, "failed to get regmap (error %ld)\n",
60 			PTR_ERR(regmap));
61 		return PTR_ERR(regmap);
62 	}
63 
64 	for (p = data; p->name; p++)
65 		clk_num = max(clk_num, p->idx + 1);
66 
67 	hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, clk_num),
68 			GFP_KERNEL);
69 	if (!hw_data)
70 		return -ENOMEM;
71 
72 	hw_data->num = clk_num;
73 
74 	/* avoid returning NULL for unused idx */
75 	while (--clk_num >= 0)
76 		hw_data->hws[clk_num] = ERR_PTR(-EINVAL);
77 
78 	for (p = data; p->name; p++) {
79 		struct clk_hw *hw;
80 
81 		dev_dbg(dev, "register %s (index=%d)\n", p->name, p->idx);
82 		hw = uniphier_clk_register(dev, regmap, p);
83 		if (WARN(IS_ERR(hw), "failed to register %s", p->name))
84 			continue;
85 
86 		if (p->idx >= 0)
87 			hw_data->hws[p->idx] = hw;
88 	}
89 
90 	return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
91 				      hw_data);
92 }
93 
uniphier_clk_remove(struct platform_device * pdev)94 static int uniphier_clk_remove(struct platform_device *pdev)
95 {
96 	of_clk_del_provider(pdev->dev.of_node);
97 
98 	return 0;
99 }
100 
101 static const struct of_device_id uniphier_clk_match[] = {
102 	/* System clock */
103 	{
104 		.compatible = "socionext,uniphier-ld4-clock",
105 		.data = uniphier_ld4_sys_clk_data,
106 	},
107 	{
108 		.compatible = "socionext,uniphier-pro4-clock",
109 		.data = uniphier_pro4_sys_clk_data,
110 	},
111 	{
112 		.compatible = "socionext,uniphier-sld8-clock",
113 		.data = uniphier_sld8_sys_clk_data,
114 	},
115 	{
116 		.compatible = "socionext,uniphier-pro5-clock",
117 		.data = uniphier_pro5_sys_clk_data,
118 	},
119 	{
120 		.compatible = "socionext,uniphier-pxs2-clock",
121 		.data = uniphier_pxs2_sys_clk_data,
122 	},
123 	{
124 		.compatible = "socionext,uniphier-ld11-clock",
125 		.data = uniphier_ld11_sys_clk_data,
126 	},
127 	{
128 		.compatible = "socionext,uniphier-ld20-clock",
129 		.data = uniphier_ld20_sys_clk_data,
130 	},
131 	{
132 		.compatible = "socionext,uniphier-pxs3-clock",
133 		.data = uniphier_pxs3_sys_clk_data,
134 	},
135 	{
136 		.compatible = "socionext,uniphier-nx1-clock",
137 		.data = uniphier_nx1_sys_clk_data,
138 	},
139 	/* Media I/O clock, SD clock */
140 	{
141 		.compatible = "socionext,uniphier-ld4-mio-clock",
142 		.data = uniphier_ld4_mio_clk_data,
143 	},
144 	{
145 		.compatible = "socionext,uniphier-pro4-mio-clock",
146 		.data = uniphier_ld4_mio_clk_data,
147 	},
148 	{
149 		.compatible = "socionext,uniphier-sld8-mio-clock",
150 		.data = uniphier_ld4_mio_clk_data,
151 	},
152 	{
153 		.compatible = "socionext,uniphier-pro5-sd-clock",
154 		.data = uniphier_pro5_sd_clk_data,
155 	},
156 	{
157 		.compatible = "socionext,uniphier-pxs2-sd-clock",
158 		.data = uniphier_pro5_sd_clk_data,
159 	},
160 	{
161 		.compatible = "socionext,uniphier-ld11-mio-clock",
162 		.data = uniphier_ld4_mio_clk_data,
163 	},
164 	{
165 		.compatible = "socionext,uniphier-ld20-sd-clock",
166 		.data = uniphier_pro5_sd_clk_data,
167 	},
168 	{
169 		.compatible = "socionext,uniphier-pxs3-sd-clock",
170 		.data = uniphier_pro5_sd_clk_data,
171 	},
172 	{
173 		.compatible = "socionext,uniphier-nx1-sd-clock",
174 		.data = uniphier_pro5_sd_clk_data,
175 	},
176 	/* Peripheral clock */
177 	{
178 		.compatible = "socionext,uniphier-ld4-peri-clock",
179 		.data = uniphier_ld4_peri_clk_data,
180 	},
181 	{
182 		.compatible = "socionext,uniphier-pro4-peri-clock",
183 		.data = uniphier_pro4_peri_clk_data,
184 	},
185 	{
186 		.compatible = "socionext,uniphier-sld8-peri-clock",
187 		.data = uniphier_ld4_peri_clk_data,
188 	},
189 	{
190 		.compatible = "socionext,uniphier-pro5-peri-clock",
191 		.data = uniphier_pro4_peri_clk_data,
192 	},
193 	{
194 		.compatible = "socionext,uniphier-pxs2-peri-clock",
195 		.data = uniphier_pro4_peri_clk_data,
196 	},
197 	{
198 		.compatible = "socionext,uniphier-ld11-peri-clock",
199 		.data = uniphier_pro4_peri_clk_data,
200 	},
201 	{
202 		.compatible = "socionext,uniphier-ld20-peri-clock",
203 		.data = uniphier_pro4_peri_clk_data,
204 	},
205 	{
206 		.compatible = "socionext,uniphier-pxs3-peri-clock",
207 		.data = uniphier_pro4_peri_clk_data,
208 	},
209 	{
210 		.compatible = "socionext,uniphier-nx1-peri-clock",
211 		.data = uniphier_pro4_peri_clk_data,
212 	},
213 	/* SoC-glue clock */
214 	{
215 		.compatible = "socionext,uniphier-pro4-sg-clock",
216 		.data = uniphier_pro4_sg_clk_data,
217 	},
218 	{ /* sentinel */ }
219 };
220 
221 static struct platform_driver uniphier_clk_driver = {
222 	.probe = uniphier_clk_probe,
223 	.remove = uniphier_clk_remove,
224 	.driver = {
225 		.name = "uniphier-clk",
226 		.of_match_table = uniphier_clk_match,
227 	},
228 };
229 builtin_platform_driver(uniphier_clk_driver);
230