dm thin metadata: fix __udivdi3 undefined on 32-bit
[linux/fpc-iii.git] / drivers / usb / phy / phy-generic.c
blob5320cb8642cb5fb8edec2147da2d72c8da619167
1 /*
2 * NOP USB transceiver for all USB transceiver which are either built-in
3 * into USB IP or which are mostly autonomous.
5 * Copyright (C) 2009 Texas Instruments Inc
6 * Author: Ajay Kumar Gupta <ajay.gupta@ti.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * Current status:
23 * This provides a "nop" transceiver for PHYs which are
24 * autonomous such as isp1504, isp1707, etc.
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>
41 #include "phy-generic.h"
43 #define VBUS_IRQ_FLAGS \
44 (IRQF_SHARED | IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING | \
45 IRQF_ONESHOT)
47 struct platform_device *usb_phy_generic_register(void)
49 return platform_device_register_simple("usb_phy_generic",
50 PLATFORM_DEVID_AUTO, NULL, 0);
52 EXPORT_SYMBOL_GPL(usb_phy_generic_register);
54 void usb_phy_generic_unregister(struct platform_device *pdev)
56 platform_device_unregister(pdev);
58 EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
60 static int nop_set_suspend(struct usb_phy *x, int suspend)
62 return 0;
65 static void nop_reset(struct usb_phy_generic *nop)
67 if (!nop->gpiod_reset)
68 return;
70 gpiod_set_value(nop->gpiod_reset, 1);
71 usleep_range(10000, 20000);
72 gpiod_set_value(nop->gpiod_reset, 0);
75 /* interface to regulator framework */
76 static void nop_set_vbus_draw(struct usb_phy_generic *nop, unsigned mA)
78 struct regulator *vbus_draw = nop->vbus_draw;
79 int enabled;
80 int ret;
82 if (!vbus_draw)
83 return;
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;
94 } else {
95 if (enabled) {
96 ret = regulator_disable(vbus_draw);
97 if (ret < 0)
98 return;
99 nop->vbus_draw_enabled = 0;
102 nop->mA = mA;
106 static irqreturn_t nop_gpio_vbus_thread(int irq, void *data)
108 struct usb_phy_generic *nop = data;
109 struct usb_otg *otg = nop->phy.otg;
110 int vbus, status;
112 vbus = gpiod_get_value(nop->gpiod_vbus);
113 if ((vbus ^ nop->vbus) == 0)
114 return IRQ_HANDLED;
115 nop->vbus = vbus;
117 if (vbus) {
118 status = USB_EVENT_VBUS;
119 otg->state = OTG_STATE_B_PERIPHERAL;
120 nop->phy.last_event = status;
121 usb_gadget_vbus_connect(otg->gadget);
123 /* drawing a "unit load" is *always* OK, except for OTG */
124 nop_set_vbus_draw(nop, 100);
126 atomic_notifier_call_chain(&nop->phy.notifier, status,
127 otg->gadget);
128 } else {
129 nop_set_vbus_draw(nop, 0);
131 usb_gadget_vbus_disconnect(otg->gadget);
132 status = USB_EVENT_NONE;
133 otg->state = OTG_STATE_B_IDLE;
134 nop->phy.last_event = status;
136 atomic_notifier_call_chain(&nop->phy.notifier, status,
137 otg->gadget);
139 return IRQ_HANDLED;
142 int usb_gen_phy_init(struct usb_phy *phy)
144 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
146 if (!IS_ERR(nop->vcc)) {
147 if (regulator_enable(nop->vcc))
148 dev_err(phy->dev, "Failed to enable power\n");
151 if (!IS_ERR(nop->clk))
152 clk_prepare_enable(nop->clk);
154 nop_reset(nop);
156 return 0;
158 EXPORT_SYMBOL_GPL(usb_gen_phy_init);
160 void usb_gen_phy_shutdown(struct usb_phy *phy)
162 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
164 gpiod_set_value(nop->gpiod_reset, 1);
166 if (!IS_ERR(nop->clk))
167 clk_disable_unprepare(nop->clk);
169 if (!IS_ERR(nop->vcc)) {
170 if (regulator_disable(nop->vcc))
171 dev_err(phy->dev, "Failed to disable power\n");
174 EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
176 static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
178 if (!otg)
179 return -ENODEV;
181 if (!gadget) {
182 otg->gadget = NULL;
183 return -ENODEV;
186 otg->gadget = gadget;
187 otg->state = OTG_STATE_B_IDLE;
188 return 0;
191 static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
193 if (!otg)
194 return -ENODEV;
196 if (!host) {
197 otg->host = NULL;
198 return -ENODEV;
201 otg->host = host;
202 return 0;
205 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
206 struct usb_phy_generic_platform_data *pdata)
208 enum usb_phy_type type = USB_PHY_TYPE_USB2;
209 int err = 0;
211 u32 clk_rate = 0;
212 bool needs_vcc = false;
214 if (dev->of_node) {
215 struct device_node *node = dev->of_node;
217 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
218 clk_rate = 0;
220 needs_vcc = of_property_read_bool(node, "vcc-supply");
221 nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",
222 GPIOD_ASIS);
223 err = PTR_ERR_OR_ZERO(nop->gpiod_reset);
224 if (!err) {
225 nop->gpiod_vbus = devm_gpiod_get_optional(dev,
226 "vbus-detect",
227 GPIOD_ASIS);
228 err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);
230 } else if (pdata) {
231 type = pdata->type;
232 clk_rate = pdata->clk_rate;
233 needs_vcc = pdata->needs_vcc;
234 if (gpio_is_valid(pdata->gpio_reset)) {
235 err = devm_gpio_request_one(dev, pdata->gpio_reset,
236 GPIOF_ACTIVE_LOW,
237 dev_name(dev));
238 if (!err)
239 nop->gpiod_reset =
240 gpio_to_desc(pdata->gpio_reset);
242 nop->gpiod_vbus = pdata->gpiod_vbus;
245 if (err == -EPROBE_DEFER)
246 return -EPROBE_DEFER;
247 if (err) {
248 dev_err(dev, "Error requesting RESET or VBUS GPIO\n");
249 return err;
251 if (nop->gpiod_reset)
252 gpiod_direction_output(nop->gpiod_reset, 1);
254 nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
255 GFP_KERNEL);
256 if (!nop->phy.otg)
257 return -ENOMEM;
259 nop->clk = devm_clk_get(dev, "main_clk");
260 if (IS_ERR(nop->clk)) {
261 dev_dbg(dev, "Can't get phy clock: %ld\n",
262 PTR_ERR(nop->clk));
265 if (!IS_ERR(nop->clk) && clk_rate) {
266 err = clk_set_rate(nop->clk, clk_rate);
267 if (err) {
268 dev_err(dev, "Error setting clock rate\n");
269 return err;
273 nop->vcc = devm_regulator_get(dev, "vcc");
274 if (IS_ERR(nop->vcc)) {
275 dev_dbg(dev, "Error getting vcc regulator: %ld\n",
276 PTR_ERR(nop->vcc));
277 if (needs_vcc)
278 return -EPROBE_DEFER;
281 nop->dev = dev;
282 nop->phy.dev = nop->dev;
283 nop->phy.label = "nop-xceiv";
284 nop->phy.set_suspend = nop_set_suspend;
285 nop->phy.type = type;
287 nop->phy.otg->state = OTG_STATE_UNDEFINED;
288 nop->phy.otg->usb_phy = &nop->phy;
289 nop->phy.otg->set_host = nop_set_host;
290 nop->phy.otg->set_peripheral = nop_set_peripheral;
292 return 0;
294 EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
296 static int usb_phy_generic_probe(struct platform_device *pdev)
298 struct device *dev = &pdev->dev;
299 struct usb_phy_generic *nop;
300 int err;
302 nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
303 if (!nop)
304 return -ENOMEM;
306 err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
307 if (err)
308 return err;
309 if (nop->gpiod_vbus) {
310 err = devm_request_threaded_irq(&pdev->dev,
311 gpiod_to_irq(nop->gpiod_vbus),
312 NULL, nop_gpio_vbus_thread,
313 VBUS_IRQ_FLAGS, "vbus_detect",
314 nop);
315 if (err) {
316 dev_err(&pdev->dev, "can't request irq %i, err: %d\n",
317 gpiod_to_irq(nop->gpiod_vbus), err);
318 return err;
322 nop->phy.init = usb_gen_phy_init;
323 nop->phy.shutdown = usb_gen_phy_shutdown;
325 err = usb_add_phy_dev(&nop->phy);
326 if (err) {
327 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
328 err);
329 return err;
332 platform_set_drvdata(pdev, nop);
334 return 0;
337 static int usb_phy_generic_remove(struct platform_device *pdev)
339 struct usb_phy_generic *nop = platform_get_drvdata(pdev);
341 usb_remove_phy(&nop->phy);
343 return 0;
346 static const struct of_device_id nop_xceiv_dt_ids[] = {
347 { .compatible = "usb-nop-xceiv" },
351 MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
353 static struct platform_driver usb_phy_generic_driver = {
354 .probe = usb_phy_generic_probe,
355 .remove = usb_phy_generic_remove,
356 .driver = {
357 .name = "usb_phy_generic",
358 .of_match_table = nop_xceiv_dt_ids,
362 static int __init usb_phy_generic_init(void)
364 return platform_driver_register(&usb_phy_generic_driver);
366 subsys_initcall(usb_phy_generic_init);
368 static void __exit usb_phy_generic_exit(void)
370 platform_driver_unregister(&usb_phy_generic_driver);
372 module_exit(usb_phy_generic_exit);
374 MODULE_ALIAS("platform:usb_phy_generic");
375 MODULE_AUTHOR("Texas Instruments Inc");
376 MODULE_DESCRIPTION("NOP USB Transceiver driver");
377 MODULE_LICENSE("GPL");