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
samsung_usb2_phy_power_on(struct phy * phy)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
samsung_usb2_phy_power_off(struct phy * phy)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
samsung_usb2_phy_xlate(struct device * dev,struct of_phandle_args * args)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
samsung_usb2_phy_probe(struct platform_device * pdev)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