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#include <linux/module.h>
28#include <linux/platform_device.h>
29#include <linux/dma-mapping.h>
30#include <linux/usb/gadget.h>
31#include <linux/usb/otg.h>
32#include <linux/usb/usb_phy_generic.h>
33#include <linux/slab.h>
34#include <linux/clk.h>
35#include <linux/regulator/consumer.h>
36#include <linux/of.h>
37#include <linux/of_gpio.h>
38#include <linux/gpio.h>
39#include <linux/delay.h>
40
41#include "phy-generic.h"
42
43#define VBUS_IRQ_FLAGS \
44 (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | \
45 IRQF_ONESHOT)
46
47struct platform_device *usb_phy_generic_register(void)
48{
49 return platform_device_register_simple("usb_phy_generic",
50 PLATFORM_DEVID_AUTO, NULL, 0);
51}
52EXPORT_SYMBOL_GPL(usb_phy_generic_register);
53
54void usb_phy_generic_unregister(struct platform_device *pdev)
55{
56 platform_device_unregister(pdev);
57}
58EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
59
60static int nop_set_suspend(struct usb_phy *x, int suspend)
61{
62 return 0;
63}
64
65static void nop_reset(struct usb_phy_generic *nop)
66{
67 if (!nop->gpiod_reset)
68 return;
69
70 gpiod_set_value(nop->gpiod_reset, 1);
71 usleep_range(10000, 20000);
72 gpiod_set_value(nop->gpiod_reset, 0);
73}
74
75
76static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
77{
78 struct regulator *vbus_draw = nop->vbus_draw;
79 int enabled;
80 int ret;
81
82 if (!vbus_draw)
83 return;
84
85 enabled = nop->vbus_draw_enabled;
86 if (mA) {
87 regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
88 if (!enabled) {
89 ret = regulator_enable(vbus_draw);
90 if (ret < 0)
91 return;
92 nop->vbus_draw_enabled = 1;
93 }
94 } else {
95 if (enabled) {
96 ret = regulator_disable(vbus_draw);
97 if (ret < 0)
98 return;
99 nop->vbus_draw_enabled = 0;
100 }
101 }
102 nop->mA = mA;
103}
104
105
106static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
107{
108 struct usb_phy_generic *nop = data;
109 struct usb_otg *otg = nop->phy.otg;
110 int vbus, status;
111
112 vbus = gpiod_get_value(nop->gpiod_vbus);
113 if ((vbus ^ nop->vbus) == 0)
114 return IRQ_HANDLED;
115 nop->vbus = vbus;
116
117 if (vbus) {
118 status = USB_EVENT_VBUS;
119 otg->state = OTG_STATE_B_PERIPHERAL;
120 nop->phy.last_event = status;
121 if (otg->gadget)
122 usb_gadget_vbus_connect(otg->gadget);
123
124
125 nop_set_vbus_draw(nop, 100);
126
127 atomic_notifier_call_chain(&nop->phy.notifier, status,
128 otg->gadget);
129 } else {
130 nop_set_vbus_draw(nop, 0);
131
132 if (otg->gadget)
133 usb_gadget_vbus_disconnect(otg->gadget);
134 status = USB_EVENT_NONE;
135 otg->state = OTG_STATE_B_IDLE;
136 nop->phy.last_event = status;
137
138 atomic_notifier_call_chain(&nop->phy.notifier, status,
139 otg->gadget);
140 }
141 return IRQ_HANDLED;
142}
143
144int usb_gen_phy_init(struct usb_phy *phy)
145{
146 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
147
148 if (!IS_ERR(nop->vcc)) {
149 if (regulator_enable(nop->vcc))
150 dev_err(phy->dev, "Failed to enable power\n");
151 }
152
153 if (!IS_ERR(nop->clk))
154 clk_prepare_enable(nop->clk);
155
156 nop_reset(nop);
157
158 return 0;
159}
160EXPORT_SYMBOL_GPL(usb_gen_phy_init);
161
162void usb_gen_phy_shutdown(struct usb_phy *phy)
163{
164 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
165
166 gpiod_set_value(nop->gpiod_reset, 1);
167
168 if (!IS_ERR(nop->clk))
169 clk_disable_unprepare(nop->clk);
170
171 if (!IS_ERR(nop->vcc)) {
172 if (regulator_disable(nop->vcc))
173 dev_err(phy->dev, "Failed to disable power\n");
174 }
175}
176EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
177
178static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
179{
180 if (!otg)
181 return -ENODEV;
182
183 if (!gadget) {
184 otg->gadget = NULL;
185 return -ENODEV;
186 }
187
188 otg->gadget = gadget;
189 if (otg->state == OTG_STATE_B_PERIPHERAL)
190 usb_gadget_vbus_connect(gadget);
191 else
192 otg->state = OTG_STATE_B_IDLE;
193 return 0;
194}
195
196static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
197{
198 if (!otg)
199 return -ENODEV;
200
201 if (!host) {
202 otg->host = NULL;
203 return -ENODEV;
204 }
205
206 otg->host = host;
207 return 0;
208}
209
210int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
211 struct usb_phy_generic_platform_data *pdata)
212{
213 enum usb_phy_type type = USB_PHY_TYPE_USB2;
214 int err = 0;
215
216 u32 clk_rate = 0;
217 bool needs_vcc = false;
218
219 if (dev->of_node) {
220 struct device_node *node = dev->of_node;
221
222 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
223 clk_rate = 0;
224
225 needs_vcc = of_property_read_bool(node, "vcc-supply");
226 nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
227 GPIOD_ASIS);
228 err = PTR_ERR_OR_ZERO(nop->gpiod_reset);
229 if (!err) {
230 nop->gpiod_vbus = devm_gpiod_get_optional(dev,
231 "vbus-detect",
232 GPIOD_ASIS);
233 err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);
234 }
235 } else if (pdata) {
236 type = pdata->type;
237 clk_rate = pdata->clk_rate;
238 needs_vcc = pdata->needs_vcc;
239 if (gpio_is_valid(pdata->gpio_reset)) {
240 err = devm_gpio_request_one(dev, pdata->gpio_reset,
241 GPIOF_ACTIVE_LOW,
242 dev_name(dev));
243 if (!err)
244 nop->gpiod_reset =
245 gpio_to_desc(pdata->gpio_reset);
246 }
247 nop->gpiod_vbus = pdata->gpiod_vbus;
248 }
249
250 if (err == -EPROBE_DEFER)
251 return -EPROBE_DEFER;
252 if (err) {
253 dev_err(dev, "Error requesting RESET or VBUS GPIO\n");
254 return err;
255 }
256 if (nop->gpiod_reset)
257 gpiod_direction_output(nop->gpiod_reset, 1);
258
259 nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
260 GFP_KERNEL);
261 if (!nop->phy.otg)
262 return -ENOMEM;
263
264 nop->clk = devm_clk_get(dev, "main_clk");
265 if (IS_ERR(nop->clk)) {
266 dev_dbg(dev, "Can't get phy clock: %ld\n",
267 PTR_ERR(nop->clk));
268 }
269
270 if (!IS_ERR(nop->clk) && clk_rate) {
271 err = clk_set_rate(nop->clk, clk_rate);
272 if (err) {
273 dev_err(dev, "Error setting clock rate\n");
274 return err;
275 }
276 }
277
278 nop->vcc = devm_regulator_get(dev, "vcc");
279 if (IS_ERR(nop->vcc)) {
280 dev_dbg(dev, "Error getting vcc regulator: %ld\n",
281 PTR_ERR(nop->vcc));
282 if (needs_vcc)
283 return -EPROBE_DEFER;
284 }
285
286 nop->dev = dev;
287 nop->phy.dev = nop->dev;
288 nop->phy.label = "nop-xceiv";
289 nop->phy.set_suspend = nop_set_suspend;
290 nop->phy.type = type;
291
292 nop->phy.otg->state = OTG_STATE_UNDEFINED;
293 nop->phy.otg->usb_phy = &nop->phy;
294 nop->phy.otg->set_host = nop_set_host;
295 nop->phy.otg->set_peripheral = nop_set_peripheral;
296
297 return 0;
298}
299EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
300
301static int usb_phy_generic_probe(struct platform_device *pdev)
302{
303 struct device *dev = &pdev->dev;
304 struct usb_phy_generic *nop;
305 int err;
306
307 nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
308 if (!nop)
309 return -ENOMEM;
310
311 err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
312 if (err)
313 return err;
314 if (nop->gpiod_vbus) {
315 err = devm_request_threaded_irq(&pdev->dev,
316 gpiod_to_irq(nop->gpiod_vbus),
317 NULL, nop_gpio_vbus_thread,
318 VBUS_IRQ_FLAGS, "vbus_detect",
319 nop);
320 if (err) {
321 dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
322 gpiod_to_irq(nop->gpiod_vbus), err);
323 return err;
324 }
325 }
326
327 nop->phy.init = usb_gen_phy_init;
328 nop->phy.shutdown = usb_gen_phy_shutdown;
329
330 err = usb_add_phy_dev(&nop->phy);
331 if (err) {
332 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
333 err);
334 return err;
335 }
336
337 platform_set_drvdata(pdev, nop);
338
339 return 0;
340}
341
342static int usb_phy_generic_remove(struct platform_device *pdev)
343{
344 struct usb_phy_generic *nop = platform_get_drvdata(pdev);
345
346 usb_remove_phy(&nop->phy);
347
348 return 0;
349}
350
351static const struct of_device_id nop_xceiv_dt_ids[] = {
352 { .compatible = "usb-nop-xceiv" },
353 { }
354};
355
356MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
357
358static struct platform_driver usb_phy_generic_driver = {
359 .probe = usb_phy_generic_probe,
360 .remove = usb_phy_generic_remove,
361 .driver = {
362 .name = "usb_phy_generic",
363 .of_match_table = nop_xceiv_dt_ids,
364 },
365};
366
367static int __init usb_phy_generic_init(void)
368{
369 return platform_driver_register(&usb_phy_generic_driver);
370}
371subsys_initcall(usb_phy_generic_init);
372
373static void __exit usb_phy_generic_exit(void)
374{
375 platform_driver_unregister(&usb_phy_generic_driver);
376}
377module_exit(usb_phy_generic_exit);
378
379MODULE_ALIAS("platform:usb_phy_generic");
380MODULE_AUTHOR("Texas Instruments Inc");
381MODULE_DESCRIPTION("NOP USB Transceiver driver");
382MODULE_LICENSE("GPL");
383
