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.
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/otg.h>
31 #include <linux/usb/usb_phy_generic.h>
32 #include <linux/slab.h>
33 #include <linux/clk.h>
34 #include <linux/regulator/consumer.h>
36 #include <linux/of_gpio.h>
37 #include <linux/gpio.h>
38 #include <linux/delay.h>
40 #include "phy-generic.h"
42 struct platform_device *usb_phy_generic_register(void)
44 return platform_device_register_simple("usb_phy_generic",
45 PLATFORM_DEVID_AUTO, NULL, 0);
47 EXPORT_SYMBOL_GPL(usb_phy_generic_register);
49 void usb_phy_generic_unregister(struct platform_device *pdev)
51 platform_device_unregister(pdev);
53 EXPORT_SYMBOL_GPL(usb_phy_generic_unregister);
55 static int nop_set_suspend(struct usb_phy *x, int suspend)
60 static void nop_reset_set(struct usb_phy_generic *nop, int asserted)
64 if (!gpio_is_valid(nop->gpio_reset))
68 if (nop->reset_active_low)
71 gpio_set_value_cansleep(nop->gpio_reset, value);
74 usleep_range(10000, 20000);
77 int usb_gen_phy_init(struct usb_phy *phy)
79 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
81 if (!IS_ERR(nop->vcc)) {
82 if (regulator_enable(nop->vcc))
83 dev_err(phy->dev, "Failed to enable power\n");
86 if (!IS_ERR(nop->clk))
87 clk_prepare_enable(nop->clk);
90 nop_reset_set(nop, 0);
94 EXPORT_SYMBOL_GPL(usb_gen_phy_init);
96 void usb_gen_phy_shutdown(struct usb_phy *phy)
98 struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);
101 nop_reset_set(nop, 1);
103 if (!IS_ERR(nop->clk))
104 clk_disable_unprepare(nop->clk);
106 if (!IS_ERR(nop->vcc)) {
107 if (regulator_disable(nop->vcc))
108 dev_err(phy->dev, "Failed to disable power\n");
111 EXPORT_SYMBOL_GPL(usb_gen_phy_shutdown);
113 static int nop_set_peripheral(struct usb_otg *otg, struct usb_gadget *gadget)
123 otg->gadget = gadget;
124 otg->state = OTG_STATE_B_IDLE;
128 static int nop_set_host(struct usb_otg *otg, struct usb_bus *host)
142 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
143 struct usb_phy_generic_platform_data *pdata)
145 enum usb_phy_type type = USB_PHY_TYPE_USB2;
149 bool needs_vcc = false;
151 nop->reset_active_low = true; /* default behaviour */
154 struct device_node *node = dev->of_node;
155 enum of_gpio_flags flags = 0;
157 if (of_property_read_u32(node, "clock-frequency", &clk_rate))
160 needs_vcc = of_property_read_bool(node, "vcc-supply");
161 nop->gpio_reset = of_get_named_gpio_flags(node, "reset-gpios",
163 if (nop->gpio_reset == -EPROBE_DEFER)
164 return -EPROBE_DEFER;
166 nop->reset_active_low = flags & OF_GPIO_ACTIVE_LOW;
170 clk_rate = pdata->clk_rate;
171 needs_vcc = pdata->needs_vcc;
172 nop->gpio_reset = pdata->gpio_reset;
174 nop->gpio_reset = -1;
177 nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),
182 nop->clk = devm_clk_get(dev, "main_clk");
183 if (IS_ERR(nop->clk)) {
184 dev_dbg(dev, "Can't get phy clock: %ld\n",
188 if (!IS_ERR(nop->clk) && clk_rate) {
189 err = clk_set_rate(nop->clk, clk_rate);
191 dev_err(dev, "Error setting clock rate\n");
196 nop->vcc = devm_regulator_get(dev, "vcc");
197 if (IS_ERR(nop->vcc)) {
198 dev_dbg(dev, "Error getting vcc regulator: %ld\n",
201 return -EPROBE_DEFER;
204 if (gpio_is_valid(nop->gpio_reset)) {
205 unsigned long gpio_flags;
208 if (nop->reset_active_low)
209 gpio_flags = GPIOF_OUT_INIT_LOW;
211 gpio_flags = GPIOF_OUT_INIT_HIGH;
213 err = devm_gpio_request_one(dev, nop->gpio_reset,
214 gpio_flags, dev_name(dev));
216 dev_err(dev, "Error requesting RESET GPIO %d\n",
223 nop->phy.dev = nop->dev;
224 nop->phy.label = "nop-xceiv";
225 nop->phy.set_suspend = nop_set_suspend;
226 nop->phy.type = type;
228 nop->phy.otg->state = OTG_STATE_UNDEFINED;
229 nop->phy.otg->usb_phy = &nop->phy;
230 nop->phy.otg->set_host = nop_set_host;
231 nop->phy.otg->set_peripheral = nop_set_peripheral;
235 EXPORT_SYMBOL_GPL(usb_phy_gen_create_phy);
237 static int usb_phy_generic_probe(struct platform_device *pdev)
239 struct device *dev = &pdev->dev;
240 struct usb_phy_generic *nop;
243 nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);
247 err = usb_phy_gen_create_phy(dev, nop, dev_get_platdata(&pdev->dev));
251 nop->phy.init = usb_gen_phy_init;
252 nop->phy.shutdown = usb_gen_phy_shutdown;
254 err = usb_add_phy_dev(&nop->phy);
256 dev_err(&pdev->dev, "can't register transceiver, err: %d\n",
261 platform_set_drvdata(pdev, nop);
266 static int usb_phy_generic_remove(struct platform_device *pdev)
268 struct usb_phy_generic *nop = platform_get_drvdata(pdev);
270 usb_remove_phy(&nop->phy);
275 static const struct of_device_id nop_xceiv_dt_ids[] = {
276 { .compatible = "usb-nop-xceiv" },
280 MODULE_DEVICE_TABLE(of, nop_xceiv_dt_ids);
282 static struct platform_driver usb_phy_generic_driver = {
283 .probe = usb_phy_generic_probe,
284 .remove = usb_phy_generic_remove,
286 .name = "usb_phy_generic",
287 .of_match_table = nop_xceiv_dt_ids,
291 static int __init usb_phy_generic_init(void)
293 return platform_driver_register(&usb_phy_generic_driver);
295 subsys_initcall(usb_phy_generic_init);
297 static void __exit usb_phy_generic_exit(void)
299 platform_driver_unregister(&usb_phy_generic_driver);
301 module_exit(usb_phy_generic_exit);
303 MODULE_ALIAS("platform:usb_phy_generic");
304 MODULE_AUTHOR("Texas Instruments Inc");
305 MODULE_DESCRIPTION("NOP USB Transceiver driver");
306 MODULE_LICENSE("GPL");