1 // SPDX-License-Identifier: GPL-2.0+
3  * NOP USB transceiver for all USB transceiver which are either built-in
4  * into USB IP or which are mostly autonomous.
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>
27 #include "phy-generic.h"
48 	struct usb_phy_generic *nop = dev_get_drvdata(x->dev);  in nop_set_suspend()
50 	if (!IS_ERR(nop->clk)) {  in nop_set_suspend()
52 			clk_disable_unprepare(nop->clk);  in nop_set_suspend()
54 			clk_prepare_enable(nop->clk);  in nop_set_suspend()
62 	if (!nop->gpiod_reset)  in nop_reset()
65 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);  in nop_reset()
67 	gpiod_set_value_cansleep(nop->gpiod_reset, 0);  in nop_reset()
73 	struct regulator *vbus_draw = nop->vbus_draw;  in nop_set_vbus_draw()
80 	enabled = nop->vbus_draw_enabled;  in nop_set_vbus_draw()
87 			nop->vbus_draw_enabled = 1;  in nop_set_vbus_draw()
94 			nop->vbus_draw_enabled = 0;  in nop_set_vbus_draw()
97 	nop->mA = mA;  in nop_set_vbus_draw()
104 	struct usb_otg *otg = nop->phy.otg;  in nop_gpio_vbus_thread()
105 	int vbus, status;  in nop_gpio_vbus_thread()  local
107 	vbus = gpiod_get_value(nop->gpiod_vbus);  in nop_gpio_vbus_thread()
108 	if ((vbus ^ nop->vbus) == 0)  in nop_gpio_vbus_thread()
110 	nop->vbus = vbus;  in nop_gpio_vbus_thread()
112 	if (vbus) {  in nop_gpio_vbus_thread()
114 		otg->state = OTG_STATE_B_PERIPHERAL;  in nop_gpio_vbus_thread()
115 		nop->phy.last_event = status;  in nop_gpio_vbus_thread()
120 		atomic_notifier_call_chain(&nop->phy.notifier, status,  in nop_gpio_vbus_thread()
121 					   otg->gadget);  in nop_gpio_vbus_thread()
126 		otg->state = OTG_STATE_B_IDLE;  in nop_gpio_vbus_thread()
127 		nop->phy.last_event = status;  in nop_gpio_vbus_thread()
129 		atomic_notifier_call_chain(&nop->phy.notifier, status,  in nop_gpio_vbus_thread()
130 					   otg->gadget);  in nop_gpio_vbus_thread()
137 	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);  in usb_gen_phy_init()
140 	if (!IS_ERR(nop->vcc)) {  in usb_gen_phy_init()
141 		if (regulator_enable(nop->vcc))  in usb_gen_phy_init()
142 			dev_err(phy->dev, "Failed to enable power\n");  in usb_gen_phy_init()
145 	if (!IS_ERR(nop->clk)) {  in usb_gen_phy_init()
146 		ret = clk_prepare_enable(nop->clk);  in usb_gen_phy_init()
159 	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);  in usb_gen_phy_shutdown()
161 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);  in usb_gen_phy_shutdown()
163 	if (!IS_ERR(nop->clk))  in usb_gen_phy_shutdown()
164 		clk_disable_unprepare(nop->clk);  in usb_gen_phy_shutdown()
166 	if (!IS_ERR(nop->vcc)) {  in usb_gen_phy_shutdown()
167 		if (regulator_disable(nop->vcc))  in usb_gen_phy_shutdown()
168 			dev_err(phy->dev, "Failed to disable power\n");  in usb_gen_phy_shutdown()
176 		return -ENODEV;  in nop_set_peripheral()
179 		otg->gadget = NULL;  in nop_set_peripheral()
180 		return -ENODEV;  in nop_set_peripheral()
183 	otg->gadget = gadget;  in nop_set_peripheral()
184 	if (otg->state == OTG_STATE_B_PERIPHERAL)  in nop_set_peripheral()
185 		atomic_notifier_call_chain(&otg->usb_phy->notifier,  in nop_set_peripheral()
186 					   USB_EVENT_VBUS, otg->gadget);  in nop_set_peripheral()
188 		otg->state = OTG_STATE_B_IDLE;  in nop_set_peripheral()
195 		return -ENODEV;  in nop_set_host()
198 		otg->host = NULL;  in nop_set_host()
199 		return -ENODEV;  in nop_set_host()
202 	otg->host = host;  in nop_set_host()
214 	if (dev->of_node) {  in usb_phy_gen_create_phy()
215 		struct device_node *node = dev->of_node;  in usb_phy_gen_create_phy()
217 		if (of_property_read_u32(node, "clock-frequency", &clk_rate))  in usb_phy_gen_create_phy()
222 	nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",  in usb_phy_gen_create_phy()
224 	err = PTR_ERR_OR_ZERO(nop->gpiod_reset);  in usb_phy_gen_create_phy()
226 		nop->gpiod_vbus = devm_gpiod_get_optional(dev,  in usb_phy_gen_create_phy()
227 						 "vbus-detect",  in usb_phy_gen_create_phy()
229 		err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);  in usb_phy_gen_create_phy()
234 				     "Error requesting RESET or VBUS GPIO\n");  in usb_phy_gen_create_phy()
235 	if (nop->gpiod_reset)  in usb_phy_gen_create_phy()
236 		gpiod_direction_output(nop->gpiod_reset, 1);  in usb_phy_gen_create_phy()
238 	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),  in usb_phy_gen_create_phy()
240 	if (!nop->phy.otg)  in usb_phy_gen_create_phy()
241 		return -ENOMEM;  in usb_phy_gen_create_phy()
243 	nop->clk = devm_clk_get(dev, "main_clk");  in usb_phy_gen_create_phy()
244 	if (IS_ERR(nop->clk)) {  in usb_phy_gen_create_phy()
246 					PTR_ERR(nop->clk));  in usb_phy_gen_create_phy()
248 			return PTR_ERR(nop->clk);  in usb_phy_gen_create_phy()
251 	if (!IS_ERR(nop->clk) && clk_rate) {  in usb_phy_gen_create_phy()
252 		err = clk_set_rate(nop->clk, clk_rate);  in usb_phy_gen_create_phy()
259 	nop->vcc = devm_regulator_get_optional(dev, "vcc");  in usb_phy_gen_create_phy()
260 	if (IS_ERR(nop->vcc) && PTR_ERR(nop->vcc) != -ENODEV)  in usb_phy_gen_create_phy()
261 		return dev_err_probe(dev, PTR_ERR(nop->vcc),  in usb_phy_gen_create_phy()
264 	nop->vbus_draw = devm_regulator_get_exclusive(dev, "vbus");  in usb_phy_gen_create_phy()
265 	if (PTR_ERR(nop->vbus_draw) == -ENODEV)  in usb_phy_gen_create_phy()
266 		nop->vbus_draw = NULL;  in usb_phy_gen_create_phy()
267 	if (IS_ERR(nop->vbus_draw))  in usb_phy_gen_create_phy()
268 		return dev_err_probe(dev, PTR_ERR(nop->vbus_draw),  in usb_phy_gen_create_phy()
269 				     "could not get vbus regulator\n");  in usb_phy_gen_create_phy()
271 	nop->dev		= dev;  in usb_phy_gen_create_phy()
272 	nop->phy.dev		= nop->dev;  in usb_phy_gen_create_phy()
273 	nop->phy.label		= "nop-xceiv";  in usb_phy_gen_create_phy()
274 	nop->phy.set_suspend	= nop_set_suspend;  in usb_phy_gen_create_phy()
275 	nop->phy.type		= type;  in usb_phy_gen_create_phy()
277 	nop->phy.otg->state		= OTG_STATE_UNDEFINED;  in usb_phy_gen_create_phy()
278 	nop->phy.otg->usb_phy		= &nop->phy;  in usb_phy_gen_create_phy()
279 	nop->phy.otg->set_host		= nop_set_host;  in usb_phy_gen_create_phy()
280 	nop->phy.otg->set_peripheral	= nop_set_peripheral;  in usb_phy_gen_create_phy()
288 	struct device *dev = &pdev->dev;  in usb_phy_generic_probe()
289 	struct device_node *dn = dev->of_node;  in usb_phy_generic_probe()
295 		return -ENOMEM;  in usb_phy_generic_probe()
300 	if (nop->gpiod_vbus) {  in usb_phy_generic_probe()
301 		err = devm_request_threaded_irq(&pdev->dev,  in usb_phy_generic_probe()
302 						gpiod_to_irq(nop->gpiod_vbus),  in usb_phy_generic_probe()
307 			dev_err(&pdev->dev, "can't request irq %i, err: %d\n",  in usb_phy_generic_probe()
308 				gpiod_to_irq(nop->gpiod_vbus), err);  in usb_phy_generic_probe()
311 		nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ?  in usb_phy_generic_probe()
315 	nop->phy.init		= usb_gen_phy_init;  in usb_phy_generic_probe()
316 	nop->phy.shutdown	= usb_gen_phy_shutdown;  in usb_phy_generic_probe()
318 	err = usb_add_phy_dev(&nop->phy);  in usb_phy_generic_probe()
320 		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",  in usb_phy_generic_probe()
327 	device_set_wakeup_capable(&pdev->dev,  in usb_phy_generic_probe()
328 				  of_property_read_bool(dn, "wakeup-source"));  in usb_phy_generic_probe()
337 	usb_remove_phy(&nop->phy);  in usb_phy_generic_remove()
341 	{ .compatible = "usb-nop-xceiv" },
370 MODULE_DESCRIPTION("NOP USB Transceiver driver");