1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29#include <linux/module.h>
30#include <linux/platform_device.h>
31#include <linux/dma-mapping.h>
32#include <linux/usb/otg.h>
33#include <linux/usb/nop-usb-xceiv.h>
34#include <linux/slab.h>
35#include <linux/clk.h>
36#include <linux/regulator/consumer.h>
37#include <linux/of.h>
38
39struct nop_usb_xceiv {
40 struct usb_phy phy;
41 struct device *dev;
42 struct clk *clk;
43 struct regulator *vcc;
44 struct regulator *reset;
45};
46
47static struct platform_device *pd;
48
49void usb_nop_xceiv_register(void)
50{
51 if (pd)
52 return;
53 pd = platform_device_register_simple("nop_usb_xceiv", -1, NULL, 0);
54 if (!pd) {
55 printk(KERN_ERR "Unable to register usb nop transceiver\n");
56 return;
57 }
58}
59EXPORT_SYMBOL(usb_nop_xceiv_register);
60
61void usb_nop_xceiv_unregister(void)
62{
63 platform_device_unregister(pd);
64 pd = NULL;
65}
66EXPORT_SYMBOL(usb_nop_xceiv_unregister);
67
68static int nop_set_suspend(struct usb_phy *x, int suspend)
69{
70 return 0;
71}
72
73static int nop_init(struct usb_phy *phy)
74{
75 struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
76
77 if (!IS_ERR(nop->vcc)) {
78 if (regulator_enable(nop->vcc))
79 dev_err(phy->dev, "Failed to enable power\n");
80 }
81
82 if (!IS_ERR(nop->clk))
83 clk_enable(nop->clk);
84
85 if (!IS_ERR(nop->reset)) {
86
87 if (regulator_enable(nop->reset))
88 dev_err(phy->dev, "Failed to de-assert reset\n");
89 }
90
91 return 0;
92}
93
94static void nop_shutdown(struct usb_phy *phy)
95{
96 struct nop_usb_xceiv *nop = dev_get_drvdata(phy->dev);
97
98 if (!IS_ERR(nop->reset)) {
99
100 if (regulator_disable(nop->reset))
101 dev_err(phy->dev, "Failed to assert reset\n");
102 }
103
104 if (!IS_ERR(nop->clk))
105 clk_disable(nop->clk);
106
107 if (!IS_ERR(nop->vcc)) {
108 if (regulator_disable(nop->vcc))
109 dev_err(phy->dev, "Failed to disable power\n");
110 }
111}
112
113static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
114{
115 if (!otg)
116 return -ENODEV;
117
118 if (!gadget) {
119 otg->gadget = NULL;
120 return -ENODEV;
121 }
122
123 otg->gadget = gadget;
124 otg->phy->state = OTG_STATE_B_IDLE;
125 return 0;
126}
127
128static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
129{
130 if (!otg)
131 return -ENODEV;
132
133 if (!host) {
134 otg->host = NULL;
135 return -ENODEV;
136 }
137
138 otg->host = host;
139 return 0;
140}
141
142static int nop_usb_xceiv_probe(struct platform_device *pdev)
143{
144 struct device *dev = &pdev->dev;
145 struct nop_usb_xceiv_platform_data *pdata = pdev->dev.platform_data;
146 struct nop_usb_xceiv *nop;
147 enum usb_phy_type type = USB_PHY_TYPE_USB2;
148 int err;
149 u32 clk_rate = 0;
150 bool needs_vcc = false;
151 bool needs_reset = false;
152
153 nop = devm_kzalloc(&pdev->dev, sizeof(*nop), GFP_KERNEL);
154 if (!nop)
155 return -ENOMEM;
156
157 nop->phy.otg = devm_kzalloc(&pdev->dev, sizeof(*nop->phy.otg),
158 GFP_KERNEL);
159 if (!nop->phy.otg)
160 return -ENOMEM;
161
162 if (dev->of_node) {
163 struct device_node *node = dev->of_node;
164
165 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
166 clk_rate = 0;
167
168 needs_vcc = of_property_read_bool(node, "vcc-supply");
169 needs_reset = of_property_read_bool(node, "reset-supply");
170
171 } else if (pdata) {
172 type = pdata->type;
173 clk_rate = pdata->clk_rate;
174 needs_vcc = pdata->needs_vcc;
175 needs_reset = pdata->needs_reset;
176 }
177
178 nop->clk = devm_clk_get(&pdev->dev, "main_clk");
179 if (IS_ERR(nop->clk)) {
180 dev_dbg(&pdev->dev, "Can't get phy clock: %ld\n",
181 PTR_ERR(nop->clk));
182 }
183
184 if (!IS_ERR(nop->clk) && clk_rate) {
185 err = clk_set_rate(nop->clk, clk_rate);
186 if (err) {
187 dev_err(&pdev->dev, "Error setting clock rate\n");
188 return err;
189 }
190 }
191
192 if (!IS_ERR(nop->clk)) {
193 err = clk_prepare(nop->clk);
194 if (err) {
195 dev_err(&pdev->dev, "Error preparing clock\n");
196 return err;
197 }
198 }
199
200 nop->vcc = devm_regulator_get(&pdev->dev, "vcc");
201 if (IS_ERR(nop->vcc)) {
202 dev_dbg(&pdev->dev, "Error getting vcc regulator: %ld\n",
203 PTR_ERR(nop->vcc));
204 if (needs_vcc)
205 return -EPROBE_DEFER;
206 }
207
208 nop->reset = devm_regulator_get(&pdev->dev, "reset");
209 if (IS_ERR(nop->reset)) {
210 dev_dbg(&pdev->dev, "Error getting reset regulator: %ld\n",
211 PTR_ERR(nop->reset));
212 if (needs_reset)
213 return -EPROBE_DEFER;
214 }
215
216 nop->dev = &pdev->dev;
217 nop->phy.dev = nop->dev;
218 nop->phy.label = "nop-xceiv";
219 nop->phy.set_suspend = nop_set_suspend;
220 nop->phy.init = nop_init;
221 nop->phy.shutdown = nop_shutdown;
222 nop->phy.state = OTG_STATE_UNDEFINED;
223 nop->phy.type = type;
224
225 nop->phy.otg->phy = &nop->phy;
226 nop->phy.otg->set_host = nop_set_host;
227 nop->phy.otg->set_peripheral = nop_set_peripheral;
228
229 err = usb_add_phy_dev(&nop->phy);
230 if (err) {
231 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
232 err);
233 goto err_add;
234 }
235
236 platform_set_drvdata(pdev, nop);
237
238 ATOMIC_INIT_NOTIFIER_HEAD(&nop->phy.notifier);
239
240 return 0;
241
242err_add:
243 if (!IS_ERR(nop->clk))
244 clk_unprepare(nop->clk);
245 return err;
246}
247
248static int nop_usb_xceiv_remove(struct platform_device *pdev)
249{
250 struct nop_usb_xceiv *nop = platform_get_drvdata(pdev);
251
252 if (!IS_ERR(nop->clk))
253 clk_unprepare(nop->clk);
254
255 usb_remove_phy(&nop->phy);
256
257 return 0;
258}
259
260static const struct of_device_id nop_xceiv_dt_ids[] = {
261 { .compatible = "usb-nop-xceiv" },
262 { }
263};
264
265MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
266
267static struct platform_driver nop_usb_xceiv_driver = {
268 .probe = nop_usb_xceiv_probe,
269 .remove = nop_usb_xceiv_remove,
270 .driver = {
271 .name = "nop_usb_xceiv",
272 .owner = THIS_MODULE,
273 .of_match_table = of_match_ptr(nop_xceiv_dt_ids),
274 },
275};
276
277static int __init nop_usb_xceiv_init(void)
278{
279 return platform_driver_register(&nop_usb_xceiv_driver);
280}
281subsys_initcall(nop_usb_xceiv_init);
282
283static void __exit nop_usb_xceiv_exit(void)
284{
285 platform_driver_unregister(&nop_usb_xceiv_driver);
286}
287module_exit(nop_usb_xceiv_exit);
288
289MODULE_ALIAS("platform:nop_usb_xceiv");
290MODULE_AUTHOR("Texas Instruments Inc");
291MODULE_DESCRIPTION("NOP USB Transceiver driver");
292MODULE_LICENSE("GPL");
293
