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/of_address.h>
14 #include <linux/of_device.h>
15 #include <linux/phy/phy.h>
16 #include <linux/platform_device.h>
17 #include <linux/spinlock.h>
18 #include "phy-samsung-usb2.h"
19
samsung_usb2_phy_power_on(struct phy * phy)20 static int samsung_usb2_phy_power_on(struct phy *phy)
21 {
22 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
23 struct samsung_usb2_phy_driver *drv = inst->drv;
24 int ret;
25
26 dev_dbg(drv->dev, "Request to power_on \"%s\" usb phy\n",
27 inst->cfg->label);
28
29 if (drv->vbus) {
30 ret = regulator_enable(drv->vbus);
31 if (ret)
32 goto err_regulator;
33 }
34
35 ret = clk_prepare_enable(drv->clk);
36 if (ret)
37 goto err_main_clk;
38 ret = clk_prepare_enable(drv->ref_clk);
39 if (ret)
40 goto err_instance_clk;
41 if (inst->cfg->power_on) {
42 spin_lock(&drv->lock);
43 ret = inst->cfg->power_on(inst);
44 spin_unlock(&drv->lock);
45 if (ret)
46 goto err_power_on;
47 }
48
49 return 0;
50
51 err_power_on:
52 clk_disable_unprepare(drv->ref_clk);
53 err_instance_clk:
54 clk_disable_unprepare(drv->clk);
55 err_main_clk:
56 if (drv->vbus)
57 regulator_disable(drv->vbus);
58 err_regulator:
59 return ret;
60 }
61
samsung_usb2_phy_power_off(struct phy * phy)62 static int samsung_usb2_phy_power_off(struct phy *phy)
63 {
64 struct samsung_usb2_phy_instance *inst = phy_get_drvdata(phy);
65 struct samsung_usb2_phy_driver *drv = inst->drv;
66 int ret = 0;
67
68 dev_dbg(drv->dev, "Request to power_off \"%s\" usb phy\n",
69 inst->cfg->label);
70 if (inst->cfg->power_off) {
71 spin_lock(&drv->lock);
72 ret = inst->cfg->power_off(inst);
73 spin_unlock(&drv->lock);
74 if (ret)
75 return ret;
76 }
77 clk_disable_unprepare(drv->ref_clk);
78 clk_disable_unprepare(drv->clk);
79 if (drv->vbus)
80 ret = regulator_disable(drv->vbus);
81
82 return ret;
83 }
84
85 static const struct phy_ops samsung_usb2_phy_ops = {
86 .power_on = samsung_usb2_phy_power_on,
87 .power_off = samsung_usb2_phy_power_off,
88 .owner = THIS_MODULE,
89 };
90
samsung_usb2_phy_xlate(struct device * dev,struct of_phandle_args * args)91 static struct phy *samsung_usb2_phy_xlate(struct device *dev,
92 struct of_phandle_args *args)
93 {
94 struct samsung_usb2_phy_driver *drv;
95
96 drv = dev_get_drvdata(dev);
97 if (!drv)
98 return ERR_PTR(-EINVAL);
99
100 if (WARN_ON(args->args[0] >= drv->cfg->num_phys))
101 return ERR_PTR(-ENODEV);
102
103 return drv->instances[args->args[0]].phy;
104 }
105
106 static const struct of_device_id samsung_usb2_phy_of_match[] = {
107 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
108 {
109 .compatible = "samsung,exynos3250-usb2-phy",
110 .data = &exynos3250_usb2_phy_config,
111 },
112 #endif
113 #ifdef CONFIG_PHY_EXYNOS4210_USB2
114 {
115 .compatible = "samsung,exynos4210-usb2-phy",
116 .data = &exynos4210_usb2_phy_config,
117 },
118 #endif
119 #ifdef CONFIG_PHY_EXYNOS4X12_USB2
120 {
121 .compatible = "samsung,exynos4x12-usb2-phy",
122 .data = &exynos4x12_usb2_phy_config,
123 },
124 #endif
125 #ifdef CONFIG_PHY_EXYNOS5250_USB2
126 {
127 .compatible = "samsung,exynos5250-usb2-phy",
128 .data = &exynos5250_usb2_phy_config,
129 },
130 {
131 .compatible = "samsung,exynos5420-usb2-phy",
132 .data = &exynos5420_usb2_phy_config,
133 },
134 #endif
135 #ifdef CONFIG_PHY_S5PV210_USB2
136 {
137 .compatible = "samsung,s5pv210-usb2-phy",
138 .data = &s5pv210_usb2_phy_config,
139 },
140 #endif
141 { },
142 };
143 MODULE_DEVICE_TABLE(of, samsung_usb2_phy_of_match);
144
samsung_usb2_phy_probe(struct platform_device * pdev)145 static int samsung_usb2_phy_probe(struct platform_device *pdev)
146 {
147 const struct samsung_usb2_phy_config *cfg;
148 struct device *dev = &pdev->dev;
149 struct phy_provider *phy_provider;
150 struct samsung_usb2_phy_driver *drv;
151 int i, ret;
152
153 if (!pdev->dev.of_node) {
154 dev_err(dev, "This driver is required to be instantiated from device tree\n");
155 return -EINVAL;
156 }
157
158 cfg = of_device_get_match_data(dev);
159 if (!cfg)
160 return -EINVAL;
161
162 drv = devm_kzalloc(dev, struct_size(drv, instances, cfg->num_phys),
163 GFP_KERNEL);
164 if (!drv)
165 return -ENOMEM;
166
167 dev_set_drvdata(dev, drv);
168 spin_lock_init(&drv->lock);
169
170 drv->cfg = cfg;
171 drv->dev = dev;
172
173 drv->reg_phy = devm_platform_ioremap_resource(pdev, 0);
174 if (IS_ERR(drv->reg_phy)) {
175 dev_err(dev, "Failed to map register memory (phy)\n");
176 return PTR_ERR(drv->reg_phy);
177 }
178
179 drv->reg_pmu = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
180 "samsung,pmureg-phandle");
181 if (IS_ERR(drv->reg_pmu)) {
182 dev_err(dev, "Failed to map PMU registers (via syscon)\n");
183 return PTR_ERR(drv->reg_pmu);
184 }
185
186 if (drv->cfg->has_mode_switch) {
187 drv->reg_sys = syscon_regmap_lookup_by_phandle(
188 pdev->dev.of_node, "samsung,sysreg-phandle");
189 if (IS_ERR(drv->reg_sys)) {
190 dev_err(dev, "Failed to map system registers (via syscon)\n");
191 return PTR_ERR(drv->reg_sys);
192 }
193 }
194
195 drv->clk = devm_clk_get(dev, "phy");
196 if (IS_ERR(drv->clk)) {
197 dev_err(dev, "Failed to get clock of phy controller\n");
198 return PTR_ERR(drv->clk);
199 }
200
201 drv->ref_clk = devm_clk_get(dev, "ref");
202 if (IS_ERR(drv->ref_clk)) {
203 dev_err(dev, "Failed to get reference clock for the phy controller\n");
204 return PTR_ERR(drv->ref_clk);
205 }
206
207 drv->ref_rate = clk_get_rate(drv->ref_clk);
208 if (drv->cfg->rate_to_clk) {
209 ret = drv->cfg->rate_to_clk(drv->ref_rate, &drv->ref_reg_val);
210 if (ret)
211 return ret;
212 }
213
214 drv->vbus = devm_regulator_get(dev, "vbus");
215 if (IS_ERR(drv->vbus)) {
216 ret = PTR_ERR(drv->vbus);
217 if (ret == -EPROBE_DEFER)
218 return ret;
219 drv->vbus = NULL;
220 }
221
222 for (i = 0; i < drv->cfg->num_phys; i++) {
223 char *label = drv->cfg->phys[i].label;
224 struct samsung_usb2_phy_instance *p = &drv->instances[i];
225
226 dev_dbg(dev, "Creating phy \"%s\"\n", label);
227 p->phy = devm_phy_create(dev, NULL, &samsung_usb2_phy_ops);
228 if (IS_ERR(p->phy)) {
229 dev_err(drv->dev, "Failed to create usb2_phy \"%s\"\n",
230 label);
231 return PTR_ERR(p->phy);
232 }
233
234 p->cfg = &drv->cfg->phys[i];
235 p->drv = drv;
236 phy_set_bus_width(p->phy, 8);
237 phy_set_drvdata(p->phy, p);
238 }
239
240 phy_provider = devm_of_phy_provider_register(dev,
241 samsung_usb2_phy_xlate);
242 if (IS_ERR(phy_provider)) {
243 dev_err(drv->dev, "Failed to register phy provider\n");
244 return PTR_ERR(phy_provider);
245 }
246
247 return 0;
248 }
249
250 static struct platform_driver samsung_usb2_phy_driver = {
251 .probe = samsung_usb2_phy_probe,
252 .driver = {
253 .of_match_table = samsung_usb2_phy_of_match,
254 .name = "samsung-usb2-phy",
255 .suppress_bind_attrs = true,
256 }
257 };
258
259 module_platform_driver(samsung_usb2_phy_driver);
260 MODULE_DESCRIPTION("Samsung S5P/Exynos SoC USB PHY driver");
261 MODULE_AUTHOR("Kamil Debski <k.debski@samsung.com>");
262 MODULE_LICENSE("GPL v2");
263 MODULE_ALIAS("platform:samsung-usb2-phy");
264