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14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/dma-mapping.h>
17#include <linux/usb/gadget.h>
18#include <linux/usb/otg.h>
19#include <linux/usb/usb_phy_generic.h>
20#include <linux/slab.h>
21#include <linux/clk.h>
22#include <linux/regulator/consumer.h>
23#include <linux/of.h>
24#include <linux/of_gpio.h>
25#include <linux/gpio.h>
26#include <linux/delay.h>
27
28#include "phy-generic.h"
29
30#define VBUS_IRQ_FLAGS \
31 (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | \
32 IRQF_ONESHOT)
33
34struct platform_device *usb_phy_generic_register(void)
35{
36 return platform_device_register_simple("usb_phy_generic",
37 PLATFORM_DEVID_AUTO, NULL, 0);
38}
39EXPORT_SYMBOL_GPL(usb_phy_generic_register);
40
41void usb_phy_generic_unregister(struct platform_device *pdev)
42{
43 platform_device_unregister(pdev);
44}
45EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
46
47static int nop_set_suspend(struct usb_phy *x, int suspend)
48{
49 struct usb_phy_generic *nop = dev_get_drvdata(x->dev);
50
51 if (!IS_ERR(nop->clk)) {
52 if (suspend)
53 clk_disable_unprepare(nop->clk);
54 else
55 clk_prepare_enable(nop->clk);
56 }
57
58 return 0;
59}
60
61static void nop_reset(struct usb_phy_generic *nop)
62{
63 if (!nop->gpiod_reset)
64 return;
65
66 gpiod_set_value_cansleep(nop->gpiod_reset, 1);
67 usleep_range(10000, 20000);
68 gpiod_set_value_cansleep(nop->gpiod_reset, 0);
69}
70
71
72static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
73{
74 struct regulator *vbus_draw = nop->vbus_draw;
75 int enabled;
76 int ret;
77
78 if (!vbus_draw)
79 return;
80
81 enabled = nop->vbus_draw_enabled;
82 if (mA) {
83 regulator_set_current_limit(vbus_draw, 0, 1000 * mA);
84 if (!enabled) {
85 ret = regulator_enable(vbus_draw);
86 if (ret < 0)
87 return;
88 nop->vbus_draw_enabled = 1;
89 }
90 } else {
91 if (enabled) {
92 ret = regulator_disable(vbus_draw);
93 if (ret < 0)
94 return;
95 nop->vbus_draw_enabled = 0;
96 }
97 }
98 nop->mA = mA;
99}
100
101
102static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
103{
104 struct usb_phy_generic *nop = data;
105 struct usb_otg *otg = nop->phy.otg;
106 int vbus, status;
107
108 vbus = gpiod_get_value(nop->gpiod_vbus);
109 if ((vbus ^ nop->vbus) == 0)
110 return IRQ_HANDLED;
111 nop->vbus = vbus;
112
113 if (vbus) {
114 status = USB_EVENT_VBUS;
115 otg->state = OTG_STATE_B_PERIPHERAL;
116 nop->phy.last_event = status;
117
118
119 nop_set_vbus_draw(nop, 100);
120
121 atomic_notifier_call_chain(&nop->phy.notifier, status,
122 otg->gadget);
123 } else {
124 nop_set_vbus_draw(nop, 0);
125
126 status = USB_EVENT_NONE;
127 otg->state = OTG_STATE_B_IDLE;
128 nop->phy.last_event = status;
129
130 atomic_notifier_call_chain(&nop->phy.notifier, status,
131 otg->gadget);
132 }
133 return IRQ_HANDLED;
134}
135
136int usb_gen_phy_init(struct usb_phy *phy)
137{
138 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
139 int ret;
140
141 if (!IS_ERR(nop->vcc)) {
142 if (regulator_enable(nop->vcc))
143 dev_err(phy->dev, "Failed to enable power\n");
144 }
145
146 if (!IS_ERR(nop->clk)) {
147 ret = clk_prepare_enable(nop->clk);
148 if (ret)
149 return ret;
150 }
151
152 nop_reset(nop);
153
154 return 0;
155}
156EXPORT_SYMBOL_GPL(usb_gen_phy_init);
157
158void usb_gen_phy_shutdown(struct usb_phy *phy)
159{
160 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
161
162 gpiod_set_value_cansleep(nop->gpiod_reset, 1);
163
164 if (!IS_ERR(nop->clk))
165 clk_disable_unprepare(nop->clk);
166
167 if (!IS_ERR(nop->vcc)) {
168 if (regulator_disable(nop->vcc))
169 dev_err(phy->dev, "Failed to disable power\n");
170 }
171}
172EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
173
174static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
175{
176 if (!otg)
177 return -ENODEV;
178
179 if (!gadget) {
180 otg->gadget = NULL;
181 return -ENODEV;
182 }
183
184 otg->gadget = gadget;
185 if (otg->state == OTG_STATE_B_PERIPHERAL)
186 atomic_notifier_call_chain(&otg->usb_phy->notifier,
187 USB_EVENT_VBUS, otg->gadget);
188 else
189 otg->state = OTG_STATE_B_IDLE;
190 return 0;
191}
192
193static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
194{
195 if (!otg)
196 return -ENODEV;
197
198 if (!host) {
199 otg->host = NULL;
200 return -ENODEV;
201 }
202
203 otg->host = host;
204 return 0;
205}
206
207int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
208 struct usb_phy_generic_platform_data *pdata)
209{
210 enum usb_phy_type type = USB_PHY_TYPE_USB2;
211 int err = 0;
212
213 u32 clk_rate = 0;
214 bool needs_vcc = false, needs_clk = false;
215
216 if (dev->of_node) {
217 struct device_node *node = dev->of_node;
218
219 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
220 clk_rate = 0;
221
222 needs_vcc = of_property_read_bool(node, "vcc-supply");
223 needs_clk = of_property_read_bool(node, "clocks");
224 nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
225 GPIOD_ASIS);
226 err = PTR_ERR_OR_ZERO(nop->gpiod_reset);
227 if (!err) {
228 nop->gpiod_vbus = devm_gpiod_get_optional(dev,
229 "vbus-detect",
230 GPIOD_ASIS);
231 err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);
232 }
233 } else if (pdata) {
234 type = pdata->type;
235 clk_rate = pdata->clk_rate;
236 needs_vcc = pdata->needs_vcc;
237 if (gpio_is_valid(pdata->gpio_reset)) {
238 err = devm_gpio_request_one(dev, pdata->gpio_reset,
239 GPIOF_ACTIVE_LOW,
240 dev_name(dev));
241 if (!err)
242 nop->gpiod_reset =
243 gpio_to_desc(pdata->gpio_reset);
244 }
245 nop->gpiod_vbus = pdata->gpiod_vbus;
246 }
247
248 if (err == -EPROBE_DEFER)
249 return -EPROBE_DEFER;
250 if (err) {
251 dev_err(dev, "Error requesting RESET or VBUS GPIO\n");
252 return err;
253 }
254 if (nop->gpiod_reset)
255 gpiod_direction_output(nop->gpiod_reset, 1);
256
257 nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
258 GFP_KERNEL);
259 if (!nop->phy.otg)
260 return -ENOMEM;
261
262 nop->clk = devm_clk_get(dev, "main_clk");
263 if (IS_ERR(nop->clk)) {
264 dev_dbg(dev, "Can't get phy clock: %ld\n",
265 PTR_ERR(nop->clk));
266 if (needs_clk)
267 return 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 nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ?
326 OTG_STATE_B_PERIPHERAL : OTG_STATE_B_IDLE;
327 }
328
329 nop->phy.init = usb_gen_phy_init;
330 nop->phy.shutdown = usb_gen_phy_shutdown;
331
332 err = usb_add_phy_dev(&nop->phy);
333 if (err) {
334 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
335 err);
336 return err;
337 }
338
339 platform_set_drvdata(pdev, nop);
340
341 return 0;
342}
343
344static int usb_phy_generic_remove(struct platform_device *pdev)
345{
346 struct usb_phy_generic *nop = platform_get_drvdata(pdev);
347
348 usb_remove_phy(&nop->phy);
349
350 return 0;
351}
352
353static const struct of_device_id nop_xceiv_dt_ids[] = {
354 { .compatible = "usb-nop-xceiv" },
355 { }
356};
357
358MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
359
360static struct platform_driver usb_phy_generic_driver = {
361 .probe = usb_phy_generic_probe,
362 .remove = usb_phy_generic_remove,
363 .driver = {
364 .name = "usb_phy_generic",
365 .of_match_table = nop_xceiv_dt_ids,
366 },
367};
368
369static int __init usb_phy_generic_init(void)
370{
371 return platform_driver_register(&usb_phy_generic_driver);
372}
373subsys_initcall(usb_phy_generic_init);
374
375static void __exit usb_phy_generic_exit(void)
376{
377 platform_driver_unregister(&usb_phy_generic_driver);
378}
379module_exit(usb_phy_generic_exit);
380
381MODULE_ALIAS("platform:usb_phy_generic");
382MODULE_AUTHOR("Texas Instruments Inc");
383MODULE_DESCRIPTION("NOP USB Transceiver driver");
384MODULE_LICENSE("GPL");
385
