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