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.
10  *	This provides a "nop" transceiver for PHYs which are
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()  local
52 		if (!IS_ERR(nop->clk))  in nop_set_suspend()
53 			clk_disable_unprepare(nop->clk);  in nop_set_suspend()
54 		if (!IS_ERR(nop->vcc) && !device_may_wakeup(x->dev))  in nop_set_suspend()
55 			ret = regulator_disable(nop->vcc);  in nop_set_suspend()
57 		if (!IS_ERR(nop->vcc) && !device_may_wakeup(x->dev))  in nop_set_suspend()
58 			ret = regulator_enable(nop->vcc);  in nop_set_suspend()
59 		if (!IS_ERR(nop->clk))  in nop_set_suspend()
60 			clk_prepare_enable(nop->clk);  in nop_set_suspend()
66 static void nop_reset(struct usb_phy_generic *nop)  in nop_reset()  argument
68 	if (!nop->gpiod_reset)  in nop_reset()
71 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);  in nop_reset()
73 	gpiod_set_value_cansleep(nop->gpiod_reset, 0);  in nop_reset()
81 	struct usb_phy_generic *nop = dev_get_drvdata(otg->usb_phy->dev);  in nop_set_vbus()  local
83 	if (!nop->vbus_draw)  in nop_set_vbus()
86 	if (enable && !nop->vbus_draw_enabled) {  in nop_set_vbus()
87 		ret = regulator_enable(nop->vbus_draw);  in nop_set_vbus()
89 			nop->vbus_draw_enabled = false;  in nop_set_vbus()
91 			nop->vbus_draw_enabled = true;  in nop_set_vbus()
93 	} else if (!enable && nop->vbus_draw_enabled) {  in nop_set_vbus()
94 		ret = regulator_disable(nop->vbus_draw);  in nop_set_vbus()
95 		nop->vbus_draw_enabled = false;  in nop_set_vbus()
103 	struct usb_phy_generic *nop = data;  in nop_gpio_vbus_thread()  local
104 	struct usb_otg *otg = nop->phy.otg;  in nop_gpio_vbus_thread()
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()
114 		otg->state = OTG_STATE_B_PERIPHERAL;  in nop_gpio_vbus_thread()
115 		nop->phy.last_event = status;  in nop_gpio_vbus_thread()
117 		atomic_notifier_call_chain(&nop->phy.notifier, status,  in nop_gpio_vbus_thread()
118 					   otg->gadget);  in nop_gpio_vbus_thread()
121 		otg->state = OTG_STATE_B_IDLE;  in nop_gpio_vbus_thread()
122 		nop->phy.last_event = status;  in nop_gpio_vbus_thread()
124 		atomic_notifier_call_chain(&nop->phy.notifier, status,  in nop_gpio_vbus_thread()
125 					   otg->gadget);  in nop_gpio_vbus_thread()
132 	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);  in usb_gen_phy_init()  local
135 	if (!IS_ERR(nop->vcc)) {  in usb_gen_phy_init()
136 		if (regulator_enable(nop->vcc))  in usb_gen_phy_init()
137 			dev_err(phy->dev, "Failed to enable power\n");  in usb_gen_phy_init()
140 	if (!IS_ERR(nop->clk)) {  in usb_gen_phy_init()
141 		ret = clk_prepare_enable(nop->clk);  in usb_gen_phy_init()
146 	nop_reset(nop);  in usb_gen_phy_init()
154 	struct usb_phy_generic *nop = dev_get_drvdata(phy->dev);  in usb_gen_phy_shutdown()  local
156 	gpiod_set_value_cansleep(nop->gpiod_reset, 1);  in usb_gen_phy_shutdown()
158 	if (!IS_ERR(nop->clk))  in usb_gen_phy_shutdown()
159 		clk_disable_unprepare(nop->clk);  in usb_gen_phy_shutdown()
161 	if (!IS_ERR(nop->vcc)) {  in usb_gen_phy_shutdown()
162 		if (regulator_disable(nop->vcc))  in usb_gen_phy_shutdown()
163 			dev_err(phy->dev, "Failed to disable power\n");  in usb_gen_phy_shutdown()
171 		return -ENODEV;  in nop_set_peripheral()
174 		otg->gadget = NULL;  in nop_set_peripheral()
175 		return -ENODEV;  in nop_set_peripheral()
178 	otg->gadget = gadget;  in nop_set_peripheral()
179 	if (otg->state == OTG_STATE_B_PERIPHERAL)  in nop_set_peripheral()
180 		atomic_notifier_call_chain(&otg->usb_phy->notifier,  in nop_set_peripheral()
181 					   USB_EVENT_VBUS, otg->gadget);  in nop_set_peripheral()
183 		otg->state = OTG_STATE_B_IDLE;  in nop_set_peripheral()
190 		return -ENODEV;  in nop_set_host()
193 		otg->host = NULL;  in nop_set_host()
194 		return -ENODEV;  in nop_set_host()
197 	otg->host = host;  in nop_set_host()
201 int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop)  in usb_phy_gen_create_phy()  argument
209 	if (dev->of_node) {  in usb_phy_gen_create_phy()
210 		struct device_node *node = dev->of_node;  in usb_phy_gen_create_phy()
212 		if (of_property_read_u32(node, "clock-frequency", &clk_rate))  in usb_phy_gen_create_phy()
217 	nop->gpiod_reset = devm_gpiod_get_optional(dev, "reset",  in usb_phy_gen_create_phy()
219 	err = PTR_ERR_OR_ZERO(nop->gpiod_reset);  in usb_phy_gen_create_phy()
221 		nop->gpiod_vbus = devm_gpiod_get_optional(dev,  in usb_phy_gen_create_phy()
222 						 "vbus-detect",  in usb_phy_gen_create_phy()
224 		err = PTR_ERR_OR_ZERO(nop->gpiod_vbus);  in usb_phy_gen_create_phy()
230 	if (nop->gpiod_reset)  in usb_phy_gen_create_phy()
231 		gpiod_direction_output(nop->gpiod_reset, 1);  in usb_phy_gen_create_phy()
233 	nop->phy.otg = devm_kzalloc(dev, sizeof(*nop->phy.otg),  in usb_phy_gen_create_phy()
235 	if (!nop->phy.otg)  in usb_phy_gen_create_phy()
236 		return -ENOMEM;  in usb_phy_gen_create_phy()
238 	nop->clk = devm_clk_get(dev, "main_clk");  in usb_phy_gen_create_phy()
239 	if (IS_ERR(nop->clk)) {  in usb_phy_gen_create_phy()
241 					PTR_ERR(nop->clk));  in usb_phy_gen_create_phy()
243 			return PTR_ERR(nop->clk);  in usb_phy_gen_create_phy()
246 	if (!IS_ERR(nop->clk) && clk_rate) {  in usb_phy_gen_create_phy()
247 		err = clk_set_rate(nop->clk, clk_rate);  in usb_phy_gen_create_phy()
254 	nop->vcc = devm_regulator_get_optional(dev, "vcc");  in usb_phy_gen_create_phy()
255 	if (IS_ERR(nop->vcc) && PTR_ERR(nop->vcc) != -ENODEV)  in usb_phy_gen_create_phy()
256 		return dev_err_probe(dev, PTR_ERR(nop->vcc),  in usb_phy_gen_create_phy()
259 	nop->vbus_draw = devm_regulator_get_exclusive(dev, "vbus");  in usb_phy_gen_create_phy()
260 	if (PTR_ERR(nop->vbus_draw) == -ENODEV)  in usb_phy_gen_create_phy()
261 		nop->vbus_draw = NULL;  in usb_phy_gen_create_phy()
262 	if (IS_ERR(nop->vbus_draw))  in usb_phy_gen_create_phy()
263 		return dev_err_probe(dev, PTR_ERR(nop->vbus_draw),  in usb_phy_gen_create_phy()
266 	nop->dev		= dev;  in usb_phy_gen_create_phy()
267 	nop->phy.dev		= nop->dev;  in usb_phy_gen_create_phy()
268 	nop->phy.label		= "nop-xceiv";  in usb_phy_gen_create_phy()
269 	nop->phy.set_suspend	= nop_set_suspend;  in usb_phy_gen_create_phy()
270 	nop->phy.type		= type;  in usb_phy_gen_create_phy()
272 	nop->phy.otg->state		= OTG_STATE_UNDEFINED;  in usb_phy_gen_create_phy()
273 	nop->phy.otg->usb_phy		= &nop->phy;  in usb_phy_gen_create_phy()
274 	nop->phy.otg->set_host		= nop_set_host;  in usb_phy_gen_create_phy()
275 	nop->phy.otg->set_peripheral	= nop_set_peripheral;  in usb_phy_gen_create_phy()
276 	nop->phy.otg->set_vbus          = nop_set_vbus;  in usb_phy_gen_create_phy()
284 	struct device *dev = &pdev->dev;  in usb_phy_generic_probe()
285 	struct device_node *dn = dev->of_node;  in usb_phy_generic_probe()
286 	struct usb_phy_generic	*nop;  in usb_phy_generic_probe()  local
289 	nop = devm_kzalloc(dev, sizeof(*nop), GFP_KERNEL);  in usb_phy_generic_probe()
290 	if (!nop)  in usb_phy_generic_probe()
291 		return -ENOMEM;  in usb_phy_generic_probe()
293 	err = usb_phy_gen_create_phy(dev, nop);  in usb_phy_generic_probe()
296 	if (nop->gpiod_vbus) {  in usb_phy_generic_probe()
297 		err = devm_request_threaded_irq(&pdev->dev,  in usb_phy_generic_probe()
298 						gpiod_to_irq(nop->gpiod_vbus),  in usb_phy_generic_probe()
301 						nop);  in usb_phy_generic_probe()
303 			dev_err(&pdev->dev, "can't request irq %i, err: %d\n",  in usb_phy_generic_probe()
304 				gpiod_to_irq(nop->gpiod_vbus), err);  in usb_phy_generic_probe()
307 		nop->phy.otg->state = gpiod_get_value(nop->gpiod_vbus) ?  in usb_phy_generic_probe()
311 	nop->phy.init		= usb_gen_phy_init;  in usb_phy_generic_probe()
312 	nop->phy.shutdown	= usb_gen_phy_shutdown;  in usb_phy_generic_probe()
314 	err = usb_add_phy_dev(&nop->phy);  in usb_phy_generic_probe()
316 		dev_err(&pdev->dev, "can't register transceiver, err: %d\n",  in usb_phy_generic_probe()
321 	platform_set_drvdata(pdev, nop);  in usb_phy_generic_probe()
323 	device_set_wakeup_capable(&pdev->dev,  in usb_phy_generic_probe()
324 				  of_property_read_bool(dn, "wakeup-source"));  in usb_phy_generic_probe()
331 	struct usb_phy_generic *nop = platform_get_drvdata(pdev);  in usb_phy_generic_remove()  local
333 	usb_remove_phy(&nop->phy);  in usb_phy_generic_remove()
335 	if (nop->vbus_draw && nop->vbus_draw_enabled)  in usb_phy_generic_remove()
336 		regulator_disable(nop->vbus_draw);  in usb_phy_generic_remove()
340 	{ .compatible = "usb-nop-xceiv" },
369 MODULE_DESCRIPTION("NOP USB Transceiver driver");