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