[J-u-boot.git] / drivers / usb / cdns3 / core.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Cadence USBSS DRD Driver.
 *
 * Copyright (C) 2018-2019 Cadence.
 * Copyright (C) 2017-2018 NXP
 * Copyright (C) 2019 Texas Instruments
 *
 * Author: Peter Chen <[email protected]>
 *         Pawel Laszczak <[email protected]>
 *         Roger Quadros <[email protected]>
 */

#include <common.h>
#include <dm.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <usb.h>
#include "../host/xhci.h"

#include "core.h"
#include "host-export.h"
#include "gadget-export.h"
#include "drd.h"

static int cdns3_idle_init(struct cdns3 *cdns);

struct cdns3_host_priv {
	struct xhci_ctrl xhci_ctrl;
	struct cdns3 cdns;
};

struct cdns3_gadget_priv {
	struct cdns3 cdns;
};

static inline
struct cdns3_role_driver *cdns3_get_current_role_driver(struct cdns3 *cdns)
{
	WARN_ON(!cdns->roles[cdns->role]);
	return cdns->roles[cdns->role];
}

static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
{
	int ret;

	if (WARN_ON(role > USB_ROLE_DEVICE))
		return 0;

	mutex_lock(&cdns->mutex);
	cdns->role = role;
	mutex_unlock(&cdns->mutex);

	if (!cdns->roles[role])
		return -ENXIO;

	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
		return 0;

	mutex_lock(&cdns->mutex);
	ret = cdns->roles[role]->start(cdns);
	if (!ret)
		cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
	mutex_unlock(&cdns->mutex);

	return ret;
}

static void cdns3_role_stop(struct cdns3 *cdns)
{
	enum usb_role role = cdns->role;

	if (WARN_ON(role > USB_ROLE_DEVICE))
		return;

	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
		return;

	mutex_lock(&cdns->mutex);
	cdns->roles[role]->stop(cdns);
	cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
	mutex_unlock(&cdns->mutex);
}

static void cdns3_exit_roles(struct cdns3 *cdns)
{
	cdns3_role_stop(cdns);
	cdns3_drd_exit(cdns);
}

static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns);

/**
 * cdns3_core_init_role - initialize role of operation
 * @cdns: Pointer to cdns3 structure
 *
 * Returns 0 on success otherwise negative errno
 */
static int cdns3_core_init_role(struct cdns3 *cdns)
{
	struct udevice *dev = cdns->dev;
	enum usb_dr_mode best_dr_mode;
	enum usb_dr_mode dr_mode;
	int ret = 0;

	dr_mode = usb_get_dr_mode(dev_of_offset(dev));
	cdns->role = USB_ROLE_NONE;

	/*
	 * If driver can't read mode by means of usb_get_dr_mode function then
	 * chooses mode according with Kernel configuration. This setting
	 * can be restricted later depending on strap pin configuration.
	 */
	if (dr_mode == USB_DR_MODE_UNKNOWN) {
		if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
		    IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
			dr_mode = USB_DR_MODE_OTG;
		else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
			dr_mode = USB_DR_MODE_HOST;
		else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
			dr_mode = USB_DR_MODE_PERIPHERAL;
	}

	/*
	 * At this point cdns->dr_mode contains strap configuration.
	 * Driver try update this setting considering kernel configuration
	 */
	best_dr_mode = cdns->dr_mode;

	ret = cdns3_idle_init(cdns);
	if (ret)
		return ret;

	if (dr_mode == USB_DR_MODE_OTG) {
		best_dr_mode = cdns->dr_mode;
	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
		best_dr_mode = dr_mode;
	} else if (cdns->dr_mode != dr_mode) {
		dev_err(dev, "Incorrect DRD configuration\n");
		return -EINVAL;
	}

	dr_mode = best_dr_mode;

#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || !defined(CONFIG_SPL_BUILD)
	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_HOST) {
		ret = cdns3_host_init(cdns);
		if (ret) {
			dev_err(dev, "Host initialization failed with %d\n",
				ret);
			goto err;
		}
	}
#endif

#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	if (dr_mode == USB_DR_MODE_OTG || dr_mode == USB_DR_MODE_PERIPHERAL) {
		ret = cdns3_gadget_init(cdns);
		if (ret) {
			dev_err(dev, "Device initialization failed with %d\n",
				ret);
			goto err;
		}
	}
#endif

	cdns->dr_mode = dr_mode;

	ret = cdns3_drd_update_mode(cdns);
	if (ret)
		goto err;

	if (cdns->dr_mode != USB_DR_MODE_OTG) {
		ret = cdns3_hw_role_switch(cdns);
		if (ret)
			goto err;
	}

	return ret;
err:
	cdns3_exit_roles(cdns);
	return ret;
}

/**
 * cdsn3_hw_role_state_machine - role switch state machine based on hw events
 * @cdns: Pointer to controller structure.
 *
 * Returns next role to be entered based on hw events.
 */
static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns)
{
	enum usb_role role;
	int id, vbus;

	if (cdns->dr_mode != USB_DR_MODE_OTG)
		goto not_otg;

	id = cdns3_get_id(cdns);
	vbus = cdns3_get_vbus(cdns);

	/*
	 * Role change state machine
	 * Inputs: ID, VBUS
	 * Previous state: cdns->role
	 * Next state: role
	 */
	role = cdns->role;

	switch (role) {
	case USB_ROLE_NONE:
		/*
		 * Driver treats USB_ROLE_NONE synonymous to IDLE state from
		 * controller specification.
		 */
		if (!id)
			role = USB_ROLE_HOST;
		else if (vbus)
			role = USB_ROLE_DEVICE;
		break;
	case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
		if (id)
			role = USB_ROLE_NONE;
		break;
	case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
		if (!vbus)
			role = USB_ROLE_NONE;
		break;
	}

	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);

	return role;

not_otg:
	if (cdns3_is_host(cdns))
		role = USB_ROLE_HOST;
	if (cdns3_is_device(cdns))
		role = USB_ROLE_DEVICE;

	return role;
}

static int cdns3_idle_role_start(struct cdns3 *cdns)
{
	return 0;
}

static void cdns3_idle_role_stop(struct cdns3 *cdns)
{
	/* Program Lane swap and bring PHY out of RESET */
	generic_phy_reset(&cdns->usb3_phy);
}

static int cdns3_idle_init(struct cdns3 *cdns)
{
	struct cdns3_role_driver *rdrv;

	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
	if (!rdrv)
		return -ENOMEM;

	rdrv->start = cdns3_idle_role_start;
	rdrv->stop = cdns3_idle_role_stop;
	rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
	rdrv->suspend = NULL;
	rdrv->resume = NULL;
	rdrv->name = "idle";

	cdns->roles[USB_ROLE_NONE] = rdrv;

	return 0;
}

/**
 * cdns3_hw_role_switch - switch roles based on HW state
 * @cdns3: controller
 */
int cdns3_hw_role_switch(struct cdns3 *cdns)
{
	enum usb_role real_role, current_role;
	int ret = 0;

	/* Do nothing if role based on syfs. */
	if (cdns->role_override)
		return 0;

	current_role = cdns->role;
	real_role = cdsn3_hw_role_state_machine(cdns);

	/* Do nothing if nothing changed */
	if (current_role == real_role)
		goto exit;

	cdns3_role_stop(cdns);

	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);

	ret = cdns3_role_start(cdns, real_role);
	if (ret) {
		/* Back to current role */
		dev_err(cdns->dev, "set %d has failed, back to %d\n",
			real_role, current_role);
		ret = cdns3_role_start(cdns, current_role);
		if (ret)
			dev_err(cdns->dev, "back to %d failed too\n",
				current_role);
	}
exit:
	return ret;
}

static int cdns3_probe(struct cdns3 *cdns)
{
	struct udevice *dev = cdns->dev;
	int ret;

	cdns->xhci_regs = dev_remap_addr_name(dev, "xhci");
	if (!cdns->xhci_regs)
		return -EINVAL;

	cdns->dev_regs = dev_remap_addr_name(dev, "dev");
	if (!cdns->dev_regs)
		return -EINVAL;

	mutex_init(&cdns->mutex);

	ret = generic_phy_get_by_name(dev, "cdns3,usb2-phy", &cdns->usb2_phy);
	if (ret)
		dev_warn(dev, "Unable to get USB2 phy (ret %d)\n", ret);

	ret = generic_phy_init(&cdns->usb2_phy);
	if (ret)
		return ret;

	ret = generic_phy_get_by_name(dev, "cdns3,usb3-phy", &cdns->usb3_phy);
	if (ret)
		dev_warn(dev, "Unable to get USB3 phy (ret %d)\n", ret);

	ret = generic_phy_init(&cdns->usb3_phy);
	if (ret)
		return ret;

	ret = generic_phy_power_on(&cdns->usb2_phy);
	if (ret)
		return ret;

	ret = generic_phy_power_on(&cdns->usb3_phy);
	if (ret)
		return ret;

	ret = cdns3_drd_init(cdns);
	if (ret)
		return ret;

	ret = cdns3_core_init_role(cdns);
	if (ret)
		return ret;

	dev_dbg(dev, "Cadence USB3 core: probe succeed\n");

	return 0;
}

static int cdns3_remove(struct cdns3 *cdns)
{
	cdns3_exit_roles(cdns);
	generic_phy_power_off(&cdns->usb2_phy);
	generic_phy_power_off(&cdns->usb3_phy);
	generic_phy_exit(&cdns->usb2_phy);
	generic_phy_exit(&cdns->usb3_phy);
	return 0;
}

static const struct udevice_id cdns3_ids[] = {
	{ .compatible = "cdns,usb3" },
	{ },
};

int cdns3_bind(struct udevice *parent)
{
	int from = dev_of_offset(parent);
	const void *fdt = gd->fdt_blob;
	enum usb_dr_mode dr_mode;
	struct udevice *dev;
	const char *driver;
	const char *name;
	int node;
	int ret;

	node = fdt_node_offset_by_compatible(fdt, from, "cdns,usb3");
	if (node < 0) {
		ret = -ENODEV;
		goto fail;
	}

	name = fdt_get_name(fdt, node, NULL);
	dr_mode = usb_get_dr_mode(node);

	switch (dr_mode) {
#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || \
	(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
	case USB_DR_MODE_HOST:
		debug("%s: dr_mode: HOST\n", __func__);
		driver = "cdns-usb3-host";
		break;
#endif
#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	case USB_DR_MODE_PERIPHERAL:
		debug("%s: dr_mode: PERIPHERAL\n", __func__);
		driver = "cdns-usb3-peripheral";
		break;
#endif
	default:
		printf("%s: unsupported dr_mode\n", __func__);
		ret = -ENODEV;
		goto fail;
	};

	ret = device_bind_driver_to_node(parent, driver, name,
					 offset_to_ofnode(node), &dev);
	if (ret) {
		printf("%s: not able to bind usb device mode\n",
		       __func__);
		goto fail;
	}

	return 0;

fail:
	/* do not return an error: failing to bind would hang the board */
	return 0;
}

#if CONFIG_IS_ENABLED(DM_USB_GADGET)
static int cdns3_gadget_probe(struct udevice *dev)
{
	struct cdns3_gadget_priv *priv = dev_get_priv(dev);
	struct cdns3 *cdns = &priv->cdns;

	cdns->dev = dev;

	return cdns3_probe(cdns);
}

static int cdns3_gadget_remove(struct udevice *dev)
{
	struct cdns3_gadget_priv *priv = dev_get_priv(dev);
	struct cdns3 *cdns = &priv->cdns;

	return cdns3_remove(cdns);
}

U_BOOT_DRIVER(cdns_usb3_peripheral) = {
	.name	= "cdns-usb3-peripheral",
	.id	= UCLASS_USB_GADGET_GENERIC,
	.of_match = cdns3_ids,
	.probe = cdns3_gadget_probe,
	.remove = cdns3_gadget_remove,
	.priv_auto_alloc_size = sizeof(struct cdns3_gadget_priv),
	.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
#endif

#if defined(CONFIG_SPL_USB_HOST_SUPPORT) || \
	(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
static int cdns3_host_probe(struct udevice *dev)
{
	struct cdns3_host_priv *priv = dev_get_priv(dev);
	struct cdns3 *cdns = &priv->cdns;

	cdns->dev = dev;

	return cdns3_probe(cdns);
}

static int cdns3_host_remove(struct udevice *dev)
{
	struct cdns3_host_priv *priv = dev_get_priv(dev);
	struct cdns3 *cdns = &priv->cdns;

	return cdns3_remove(cdns);
}

U_BOOT_DRIVER(cdns_usb3_host) = {
	.name	= "cdns-usb3-host",
	.id	= UCLASS_USB,
	.of_match = cdns3_ids,
	.probe = cdns3_host_probe,
	.remove = cdns3_host_remove,
	.priv_auto_alloc_size = sizeof(struct cdns3_host_priv),
	.ops = &xhci_usb_ops,
	.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
#endif
Commit	Line	Data
7e91f6cc VR	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Cadence USBSS DRD Driver.
	4	*
	5	* Copyright (C) 2018-2019 Cadence.
	6	* Copyright (C) 2017-2018 NXP
	7	* Copyright (C) 2019 Texas Instruments
	8	*
	9	* Author: Peter Chen <[email protected]>
	10	* Pawel Laszczak <[email protected]>
	11	* Roger Quadros <[email protected]>
	12	*/
	13
	14	#include <common.h>
	15	#include <dm.h>
	16	#include <dm/device-internal.h>
	17	#include <dm/lists.h>
	18	#include <linux/kernel.h>
	19	#include <linux/io.h>
	20	#include <usb.h>
	21	#include "../host/xhci.h"
	22
	23	#include "core.h"
	24	#include "host-export.h"
	25	#include "gadget-export.h"
	26	#include "drd.h"
	27
	28	static int cdns3_idle_init(struct cdns3 *cdns);
	29
	30	struct cdns3_host_priv {
	31	struct xhci_ctrl xhci_ctrl;
	32	struct cdns3 cdns;
	33	};
	34
	35	struct cdns3_gadget_priv {
	36	struct cdns3 cdns;
	37	};
	38
	39	static inline
	40	struct cdns3_role_driver cdns3_get_current_role_driver(struct cdns3 cdns)
	41	{
	42	WARN_ON(!cdns->roles[cdns->role]);
	43	return cdns->roles[cdns->role];
	44	}
	45
	46	static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
	47	{
	48	int ret;
	49
	50	if (WARN_ON(role > USB_ROLE_DEVICE))
	51	return 0;
	52
	53	mutex_lock(&cdns->mutex);
	54	cdns->role = role;
	55	mutex_unlock(&cdns->mutex);
	56
	57	if (!cdns->roles[role])
	58	return -ENXIO;
	59
	60	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
	61	return 0;
	62
	63	mutex_lock(&cdns->mutex);
	64	ret = cdns->roles[role]->start(cdns);
65	if (!ret)
66	cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
67	mutex_unlock(&cdns->mutex);
68
69	return ret;
70	}
71
72	static void cdns3_role_stop(struct cdns3 *cdns)
73	{
74	enum usb_role role = cdns->role;
75
76	if (WARN_ON(role > USB_ROLE_DEVICE))
77	return;
78
79	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
80	return;
81
82	mutex_lock(&cdns->mutex);
83	cdns->roles[role]->stop(cdns);
84	cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
85	mutex_unlock(&cdns->mutex);
86	}
87
88	static void cdns3_exit_roles(struct cdns3 *cdns)
89	{
90	cdns3_role_stop(cdns);
91	cdns3_drd_exit(cdns);
92	}
93
94	static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns);
95
96	/**
97	* cdns3_core_init_role - initialize role of operation
98	* @cdns: Pointer to cdns3 structure
99	*
100	* Returns 0 on success otherwise negative errno
101	*/
102	static int cdns3_core_init_role(struct cdns3 *cdns)
103	{
104	struct udevice *dev = cdns->dev;
105	enum usb_dr_mode best_dr_mode;
106	enum usb_dr_mode dr_mode;
107	int ret = 0;
108
109	dr_mode = usb_get_dr_mode(dev_of_offset(dev));
110	cdns->role = USB_ROLE_NONE;
111
112	/*
113	* If driver can't read mode by means of usb_get_dr_mode function then
114	* chooses mode according with Kernel configuration. This setting
115	* can be restricted later depending on strap pin configuration.
116	*/
117	if (dr_mode == USB_DR_MODE_UNKNOWN) {
118	if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
119	IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
120	dr_mode = USB_DR_MODE_OTG;
121	else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
122	dr_mode = USB_DR_MODE_HOST;
123	else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
124	dr_mode = USB_DR_MODE_PERIPHERAL;
125	}
126
127	/*
128	* At this point cdns->dr_mode contains strap configuration.
129	* Driver try update this setting considering kernel configuration
130	*/
131	best_dr_mode = cdns->dr_mode;
132
133	ret = cdns3_idle_init(cdns);
134	if (ret)
135	return ret;
136
137	if (dr_mode == USB_DR_MODE_OTG) {
138	best_dr_mode = cdns->dr_mode;
139	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
140	best_dr_mode = dr_mode;
141	} else if (cdns->dr_mode != dr_mode) {
142	dev_err(dev, "Incorrect DRD configuration\n");
143	return -EINVAL;
144	}
145
146	dr_mode = best_dr_mode;
147
148	#if defined(CONFIG_SPL_USB_HOST_SUPPORT) \|\| !defined(CONFIG_SPL_BUILD)
149	if (dr_mode == USB_DR_MODE_OTG \|\| dr_mode == USB_DR_MODE_HOST) {
150	ret = cdns3_host_init(cdns);
151	if (ret) {
152	dev_err(dev, "Host initialization failed with %d\n",
153	ret);
154	goto err;
155	}
156	}
157	#endif
158
159	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
160	if (dr_mode == USB_DR_MODE_OTG \|\| dr_mode == USB_DR_MODE_PERIPHERAL) {
161	ret = cdns3_gadget_init(cdns);
162	if (ret) {
163	dev_err(dev, "Device initialization failed with %d\n",
164	ret);
165	goto err;
166	}
167	}
168	#endif
169
170	cdns->dr_mode = dr_mode;
171
172	ret = cdns3_drd_update_mode(cdns);
173	if (ret)
174	goto err;
175
176	if (cdns->dr_mode != USB_DR_MODE_OTG) {
177	ret = cdns3_hw_role_switch(cdns);
178	if (ret)
179	goto err;
180	}
181
182	return ret;
183	err:
184	cdns3_exit_roles(cdns);
185	return ret;
186	}
187
188	/**
189	* cdsn3_hw_role_state_machine - role switch state machine based on hw events
190	* @cdns: Pointer to controller structure.
191	*
192	* Returns next role to be entered based on hw events.
193	*/
194	static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns)
195	{
196	enum usb_role role;
197	int id, vbus;
198
199	if (cdns->dr_mode != USB_DR_MODE_OTG)
200	goto not_otg;
201
202	id = cdns3_get_id(cdns);
203	vbus = cdns3_get_vbus(cdns);
204
205	/*
206	* Role change state machine
207	* Inputs: ID, VBUS
208	* Previous state: cdns->role
209	* Next state: role
210	*/
211	role = cdns->role;
212
213	switch (role) {
214	case USB_ROLE_NONE:
215	/*
216	* Driver treats USB_ROLE_NONE synonymous to IDLE state from
217	* controller specification.
218	*/
219	if (!id)
220	role = USB_ROLE_HOST;
221	else if (vbus)
222	role = USB_ROLE_DEVICE;
223	break;
224	case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
225	if (id)
226	role = USB_ROLE_NONE;
227	break;
228	case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
229	if (!vbus)
230	role = USB_ROLE_NONE;
231	break;
232	}
233
234	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
235
236	return role;
237
238	not_otg:
239	if (cdns3_is_host(cdns))
240	role = USB_ROLE_HOST;
241	if (cdns3_is_device(cdns))
242	role = USB_ROLE_DEVICE;
243
244	return role;
245	}
246
247	static int cdns3_idle_role_start(struct cdns3 *cdns)
248	{
249	return 0;
250	}
251
252	static void cdns3_idle_role_stop(struct cdns3 *cdns)
253	{
254	/* Program Lane swap and bring PHY out of RESET */
255	generic_phy_reset(&cdns->usb3_phy);
256	}
257
258	static int cdns3_idle_init(struct cdns3 *cdns)
259	{
260	struct cdns3_role_driver *rdrv;
261
262	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
263	if (!rdrv)
264	return -ENOMEM;
265
266	rdrv->start = cdns3_idle_role_start;
267	rdrv->stop = cdns3_idle_role_stop;
268	rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
269	rdrv->suspend = NULL;
270	rdrv->resume = NULL;
271	rdrv->name = "idle";
272
273	cdns->roles[USB_ROLE_NONE] = rdrv;
274
275	return 0;
276	}
277
278	/**
279	* cdns3_hw_role_switch - switch roles based on HW state
280	* @cdns3: controller
281	*/
282	int cdns3_hw_role_switch(struct cdns3 *cdns)
283	{
284	enum usb_role real_role, current_role;
285	int ret = 0;
286
287	/* Do nothing if role based on syfs. */
288	if (cdns->role_override)
289	return 0;
290
291	current_role = cdns->role;
292	real_role = cdsn3_hw_role_state_machine(cdns);
293
294	/* Do nothing if nothing changed */
295	if (current_role == real_role)
296	goto exit;
297
298	cdns3_role_stop(cdns);
299
300	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
301
302	ret = cdns3_role_start(cdns, real_role);
303	if (ret) {
304	/* Back to current role */
305	dev_err(cdns->dev, "set %d has failed, back to %d\n",
306	real_role, current_role);
307	ret = cdns3_role_start(cdns, current_role);
308	if (ret)
309	dev_err(cdns->dev, "back to %d failed too\n",
310	current_role);
311	}
312	exit:
313	return ret;
314	}
315
316	static int cdns3_probe(struct cdns3 *cdns)
317	{
318	struct udevice *dev = cdns->dev;
319	int ret;
320
321	cdns->xhci_regs = dev_remap_addr_name(dev, "xhci");
322	if (!cdns->xhci_regs)
323	return -EINVAL;
324
325	cdns->dev_regs = dev_remap_addr_name(dev, "dev");
326	if (!cdns->dev_regs)
327	return -EINVAL;
328
329	mutex_init(&cdns->mutex);
330
331	ret = generic_phy_get_by_name(dev, "cdns3,usb2-phy", &cdns->usb2_phy);
332	if (ret)
333	dev_warn(dev, "Unable to get USB2 phy (ret %d)\n", ret);
334
335	ret = generic_phy_init(&cdns->usb2_phy);
336	if (ret)
337	return ret;
338
339	ret = generic_phy_get_by_name(dev, "cdns3,usb3-phy", &cdns->usb3_phy);
340	if (ret)
341	dev_warn(dev, "Unable to get USB3 phy (ret %d)\n", ret);
342
343	ret = generic_phy_init(&cdns->usb3_phy);
344	if (ret)
345	return ret;
346
347	ret = generic_phy_power_on(&cdns->usb2_phy);
348	if (ret)
349	return ret;
350
351	ret = generic_phy_power_on(&cdns->usb3_phy);
352	if (ret)
353	return ret;
354
355	ret = cdns3_drd_init(cdns);
356	if (ret)
357	return ret;
358
359	ret = cdns3_core_init_role(cdns);
360	if (ret)
361	return ret;
362
363	dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
364
365	return 0;
366	}
367
368	static int cdns3_remove(struct cdns3 *cdns)
369	{
370	cdns3_exit_roles(cdns);
371	generic_phy_power_off(&cdns->usb2_phy);
372	generic_phy_power_off(&cdns->usb3_phy);
373	generic_phy_exit(&cdns->usb2_phy);
374	generic_phy_exit(&cdns->usb3_phy);
375	return 0;
376	}
377
378	static const struct udevice_id cdns3_ids[] = {
379	{ .compatible = "cdns,usb3" },
380	{ },
381	};
382
383	int cdns3_bind(struct udevice *parent)
384	{
385	int from = dev_of_offset(parent);
386	const void *fdt = gd->fdt_blob;
387	enum usb_dr_mode dr_mode;
388	struct udevice *dev;
389	const char *driver;
390	const char *name;
391	int node;
392	int ret;
393
394	node = fdt_node_offset_by_compatible(fdt, from, "cdns,usb3");
395	if (node < 0) {
396	ret = -ENODEV;
397	goto fail;
398	}
399
400	name = fdt_get_name(fdt, node, NULL);
401	dr_mode = usb_get_dr_mode(node);
402
403	switch (dr_mode) {
404	#if defined(CONFIG_SPL_USB_HOST_SUPPORT) \|\| \
405	(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
406	case USB_DR_MODE_HOST:
407	debug("%s: dr_mode: HOST\n", __func__);
408	driver = "cdns-usb3-host";
409	break;
410	#endif
411	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
412	case USB_DR_MODE_PERIPHERAL:
413	debug("%s: dr_mode: PERIPHERAL\n", __func__);
414	driver = "cdns-usb3-peripheral";
415	break;
416	#endif
417	default:
418	printf("%s: unsupported dr_mode\n", __func__);
419	ret = -ENODEV;
420	goto fail;
421	};
422
423	ret = device_bind_driver_to_node(parent, driver, name,
424	offset_to_ofnode(node), &dev);
425	if (ret) {
426	printf("%s: not able to bind usb device mode\n",
427	__func__);
428	goto fail;
429	}
430
431	return 0;
432
433	fail:
434	/* do not return an error: failing to bind would hang the board */
435	return 0;
436	}
437
438	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
439	static int cdns3_gadget_probe(struct udevice *dev)
440	{
441	struct cdns3_gadget_priv *priv = dev_get_priv(dev);
442	struct cdns3 *cdns = &priv->cdns;
443
444	cdns->dev = dev;
445
446	return cdns3_probe(cdns);
447	}
448
449	static int cdns3_gadget_remove(struct udevice *dev)
450	{
451	struct cdns3_gadget_priv *priv = dev_get_priv(dev);
452	struct cdns3 *cdns = &priv->cdns;
453
454	return cdns3_remove(cdns);
455	}
456
457	U_BOOT_DRIVER(cdns_usb3_peripheral) = {
458	.name = "cdns-usb3-peripheral",
459	.id = UCLASS_USB_GADGET_GENERIC,
460	.of_match = cdns3_ids,
461	.probe = cdns3_gadget_probe,
462	.remove = cdns3_gadget_remove,
463	.priv_auto_alloc_size = sizeof(struct cdns3_gadget_priv),
464	.flags = DM_FLAG_ALLOC_PRIV_DMA,
465	};
466	#endif
467
468	#if defined(CONFIG_SPL_USB_HOST_SUPPORT) \|\| \
469	(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
470	static int cdns3_host_probe(struct udevice *dev)
471	{
472	struct cdns3_host_priv *priv = dev_get_priv(dev);
473	struct cdns3 *cdns = &priv->cdns;
474
475	cdns->dev = dev;
476
477	return cdns3_probe(cdns);
478	}
479
480	static int cdns3_host_remove(struct udevice *dev)
481	{
482	struct cdns3_host_priv *priv = dev_get_priv(dev);
483	struct cdns3 *cdns = &priv->cdns;
484
485	return cdns3_remove(cdns);
486	}
487
488	U_BOOT_DRIVER(cdns_usb3_host) = {
489	.name = "cdns-usb3-host",
490	.id = UCLASS_USB,
491	.of_match = cdns3_ids,
492	.probe = cdns3_host_probe,
493	.remove = cdns3_host_remove,
494	.priv_auto_alloc_size = sizeof(struct cdns3_host_priv),
495	.ops = &xhci_usb_ops,
496	.flags = DM_FLAG_ALLOC_PRIV_DMA,
497	};
498	#endif