1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Samsung SoC USB 1.1/2.0 PHY driver
4  *
5  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
6  * Author: Kamil Debski <k.debski@samsung.com>
7  */
8 
9 #include <linux/clk.h>
10 #include <linux/mfd/syscon.h>
11 #include <linux/module.h>
12 #include <linux/of.h>
13 #include <linux/phy/phy.h>
14 #include <linux/platform_device.h>
15 #include <linux/spinlock.h>
16 #include "phy-samsung-usb2.h"
17 
18 static int samsung_usb2_phy_power_on(struct phy *phy)
19 {
20 	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
21 	struct samsung_usb2_phy_driver *drv = inst->drv;
22 	int ret;
23 
24 	dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
25 		inst->cfg->label);
26 
27 	if (drv->vbus) {
28 		ret = regulator_enable(drv->vbus);
29 		if (ret)
30 			goto err_regulator;
31 	}
32 
33 	ret = clk_prepare_enable(drv->clk);
34 	if (ret)
35 		goto err_main_clk;
36 	ret = clk_prepare_enable(drv->ref_clk);
37 	if (ret)
38 		goto err_instance_clk;
39 	if (inst->cfg->power_on) {
40 		spin_lock(&drv->lock);
41 		ret = inst->cfg->power_on(inst);
42 		spin_unlock(&drv->lock);
43 		if (ret)
44 			goto err_power_on;
45 	}
46 
47 	return 0;
48 
49 err_power_on:
50 	clk_disable_unprepare(drv->ref_clk);
51 err_instance_clk:
52 	clk_disable_unprepare(drv->clk);
53 err_main_clk:
54 	if (drv->vbus)
55 		regulator_disable(drv->vbus);
56 err_regulator:
57 	return ret;
58 }
59 
60 static int samsung_usb2_phy_power_off(struct phy *phy)
61 {
62 	struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
63 	struct samsung_usb2_phy_driver *drv = inst->drv;
64 	int ret = 0;
65 
66 	dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
67 		inst->cfg->label);
68 	if (inst->cfg->power_off) {
69 		spin_lock(&drv->lock);
70 		ret = inst->cfg->power_off(inst);
71 		spin_unlock(&drv->lock);
72 		if (ret)
73 			return ret;
74 	}
75 	clk_disable_unprepare(drv->ref_clk);
76 	clk_disable_unprepare(drv->clk);
77 	if (drv->vbus)
78 		ret = regulator_disable(drv->vbus);
79 
80 	return ret;
81 }
82 
83 static const struct phy_ops samsung_usb2_phy_ops = {
84 	.power_on	= samsung_usb2_phy_power_on,
85 	.power_off	= samsung_usb2_phy_power_off,
86 	.owner		= THIS_MODULE,
87 };
88 
89 static struct phy *samsung_usb2_phy_xlate(struct device *dev,
90 					struct of_phandle_args *args)
91 {
92 	struct samsung_usb2_phy_driver *drv;
93 
94 	drv = dev_get_drvdata(dev);
95 	if (!drv)
96 		return ERR_PTR(-EINVAL);
97 
98 	if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
99 		return ERR_PTR(-ENODEV);
100 
101 	return drv->instances[args->args[0]].phy;
102 }
103 
104 static const struct of_device_id samsung_usb2_phy_of_match[] = {
105 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
106 	{
107 		.compatible = "samsung,exynos3250-usb2-phy",
108 		.data = &exynos3250_usb2_phy_config,
109 	},
110 #endif
111 #ifdef CONFIG_PHY_EXYNOS4210_USB2
112 	{
113 		.compatible = "samsung,exynos4210-usb2-phy",
114 		.data = &exynos4210_usb2_phy_config,
115 	},
116 #endif
117 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
118 	{
119 		.compatible = "samsung,exynos4x12-usb2-phy",
120 		.data = &exynos4x12_usb2_phy_config,
121 	},
122 #endif
123 #ifdef CONFIG_PHY_EXYNOS5250_USB2
124 	{
125 		.compatible = "samsung,exynos5250-usb2-phy",
126 		.data = &exynos5250_usb2_phy_config,
127 	},
128 	{
129 		.compatible = "samsung,exynos5420-usb2-phy",
130 		.data = &exynos5420_usb2_phy_config,
131 	},
132 #endif
133 #ifdef CONFIG_PHY_S5PV210_USB2
134 	{
135 		.compatible = "samsung,s5pv210-usb2-phy",
136 		.data = &s5pv210_usb2_phy_config,
137 	},
138 #endif
139 	{ },
140 };
141 MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
142 
143 static int samsung_usb2_phy_probe(struct platform_device *pdev)
144 {
145 	const struct samsung_usb2_phy_config *cfg;
146 	struct device *dev = &pdev->dev;
147 	struct phy_provider *phy_provider;
148 	struct samsung_usb2_phy_driver *drv;
149 	int i, ret;
150 
151 	if (!pdev->dev.of_node) {
152 		dev_err(dev, "This driver is required to be instantiated from device tree\n");
153 		return -EINVAL;
154 	}
155 
156 	cfg = of_device_get_match_data(dev);
157 	if (!cfg)
158 		return -EINVAL;
159 
160 	drv = devm_kzalloc(dev, struct_size(drv, instances, cfg->num_phys),
161 			   GFP_KERNEL);
162 	if (!drv)
163 		return -ENOMEM;
164 
165 	dev_set_drvdata(dev, drv);
166 	spin_lock_init(&drv->lock);
167 
168 	drv->cfg = cfg;
169 	drv->dev = dev;
170 
171 	drv->reg_phy = devm_platform_ioremap_resource(pdev, 0);
172 	if (IS_ERR(drv->reg_phy)) {
173 		dev_err(dev, "Failed to map register memory (phy)\n");
174 		return PTR_ERR(drv->reg_phy);
175 	}
176 
177 	drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
178 		"samsung,pmureg-phandle");
179 	if (IS_ERR(drv->reg_pmu)) {
180 		dev_err(dev, "Failed to map PMU registers (via syscon)\n");
181 		return PTR_ERR(drv->reg_pmu);
182 	}
183 
184 	if (drv->cfg->has_mode_switch) {
185 		drv->reg_sys = syscon_regmap_lookup_by_phandle(
186 				pdev->dev.of_node, "samsung,sysreg-phandle");
187 		if (IS_ERR(drv->reg_sys)) {
188 			dev_err(dev, "Failed to map system registers (via syscon)\n");
189 			return PTR_ERR(drv->reg_sys);
190 		}
191 	}
192 
193 	drv->clk = devm_clk_get(dev, "phy");
194 	if (IS_ERR(drv->clk)) {
195 		dev_err(dev, "Failed to get clock of phy controller\n");
196 		return PTR_ERR(drv->clk);
197 	}
198 
199 	drv->ref_clk = devm_clk_get(dev, "ref");
200 	if (IS_ERR(drv->ref_clk)) {
201 		dev_err(dev, "Failed to get reference clock for the phy controller\n");
202 		return PTR_ERR(drv->ref_clk);
203 	}
204 
205 	drv->ref_rate = clk_get_rate(drv->ref_clk);
206 	if (drv->cfg->rate_to_clk) {
207 		ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
208 		if (ret)
209 			return ret;
210 	}
211 
212 	drv->vbus = devm_regulator_get(dev, "vbus");
213 	if (IS_ERR(drv->vbus)) {
214 		ret = PTR_ERR(drv->vbus);
215 		if (ret == -EPROBE_DEFER)
216 			return ret;
217 		drv->vbus = NULL;
218 	}
219 
220 	for (i = 0; i < drv->cfg->num_phys; i++) {
221 		char *label = drv->cfg->phys[i].label;
222 		struct samsung_usb2_phy_instance *p = &drv->instances[i];
223 
224 		dev_dbg(dev, "Creating phy \"%s\"\n", label);
225 		p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);
226 		if (IS_ERR(p->phy)) {
227 			dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
228 				label);
229 			return PTR_ERR(p->phy);
230 		}
231 
232 		p->cfg = &drv->cfg->phys[i];
233 		p->drv = drv;
234 		phy_set_bus_width(p->phy, 8);
235 		phy_set_drvdata(p->phy, p);
236 	}
237 
238 	phy_provider = devm_of_phy_provider_register(dev,
239 							samsung_usb2_phy_xlate);
240 	if (IS_ERR(phy_provider)) {
241 		dev_err(drv->dev, "Failed to register phy provider\n");
242 		return PTR_ERR(phy_provider);
243 	}
244 
245 	return 0;
246 }
247 
248 static struct platform_driver samsung_usb2_phy_driver = {
249 	.probe	= samsung_usb2_phy_probe,
250 	.driver = {
251 		.of_match_table	= samsung_usb2_phy_of_match,
252 		.name		= "samsung-usb2-phy",
253 		.suppress_bind_attrs = true,
254 	}
255 };
256 
257 module_platform_driver(samsung_usb2_phy_driver);
258 MODULE_DESCRIPTION("Samsung S5P/Exynos SoC USB PHY driver");
259 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
260 MODULE_LICENSE("GPL v2");
261 MODULE_ALIAS("platform:samsung-usb2-phy");
262