[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 <log.h>
#include <dm/device-internal.h>
#include <dm/device_compat.h>
#include <dm/devres.h>
#include <dm/lists.h>
#include <linux/bug.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <usb.h>
#include <usb/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_ofnode(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) || !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)
{
	enum usb_dr_mode dr_mode;
	struct udevice *dev;
	const char *driver;
	const char *name;
	ofnode node;
	int ret;

	node = ofnode_by_compatible(dev_ofnode(parent), "cdns,usb3");
	if (!ofnode_valid(node)) {
		ret = -ENODEV;
		goto fail;
	}

	name = ofnode_get_name(node);
	dr_mode = usb_get_dr_mode(node);

	switch (dr_mode) {
#if defined(CONFIG_SPL_USB_HOST) || \
	(!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, 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	= sizeof(struct cdns3_gadget_priv),
	.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
#endif

#if defined(CONFIG_SPL_USB_HOST) || \
	(!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	= 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>
f7ae49fc	16	#include <log.h>
7e91f6cc	17	#include <dm/device-internal.h>
336d4615	18	#include <dm/device_compat.h>
61b29b82	19	#include <dm/devres.h>
7e91f6cc	20	#include <dm/lists.h>
eb41d8a1	21	#include <linux/bug.h>
7e91f6cc VR	22	#include <linux/kernel.h>
	23	#include <linux/io.h>
	24	#include <usb.h>
e5521b1c	25	#include <usb/xhci.h>
7e91f6cc VR	26
	27	#include "core.h"
	28	#include "host-export.h"
	29	#include "gadget-export.h"
	30	#include "drd.h"
	31
	32	static int cdns3_idle_init(struct cdns3 *cdns);
	33
	34	struct cdns3_host_priv {
	35	struct xhci_ctrl xhci_ctrl;
	36	struct cdns3 cdns;
	37	};
	38
	39	struct cdns3_gadget_priv {
	40	struct cdns3 cdns;
	41	};
	42
	43	static inline
	44	struct cdns3_role_driver cdns3_get_current_role_driver(struct cdns3 cdns)
	45	{
	46	WARN_ON(!cdns->roles[cdns->role]);
	47	return cdns->roles[cdns->role];
	48	}
	49
	50	static int cdns3_role_start(struct cdns3 *cdns, enum usb_role role)
	51	{
	52	int ret;
	53
	54	if (WARN_ON(role > USB_ROLE_DEVICE))
	55	return 0;
	56
	57	mutex_lock(&cdns->mutex);
	58	cdns->role = role;
	59	mutex_unlock(&cdns->mutex);
	60
	61	if (!cdns->roles[role])
	62	return -ENXIO;
	63
	64	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_ACTIVE)
	65	return 0;
	66
	67	mutex_lock(&cdns->mutex);
	68	ret = cdns->roles[role]->start(cdns);
	69	if (!ret)
	70	cdns->roles[role]->state = CDNS3_ROLE_STATE_ACTIVE;
	71	mutex_unlock(&cdns->mutex);
	72
	73	return ret;
	74	}
	75
	76	static void cdns3_role_stop(struct cdns3 *cdns)
	77	{
	78	enum usb_role role = cdns->role;
	79
	80	if (WARN_ON(role > USB_ROLE_DEVICE))
	81	return;
	82
	83	if (cdns->roles[role]->state == CDNS3_ROLE_STATE_INACTIVE)
	84	return;
	85
	86	mutex_lock(&cdns->mutex);
	87	cdns->roles[role]->stop(cdns);
	88	cdns->roles[role]->state = CDNS3_ROLE_STATE_INACTIVE;
	89	mutex_unlock(&cdns->mutex);
90	}
91
92	static void cdns3_exit_roles(struct cdns3 *cdns)
93	{
94	cdns3_role_stop(cdns);
95	cdns3_drd_exit(cdns);
96	}
97
98	static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns);
99
100	/**
101	* cdns3_core_init_role - initialize role of operation
102	* @cdns: Pointer to cdns3 structure
103	*
104	* Returns 0 on success otherwise negative errno
105	*/
106	static int cdns3_core_init_role(struct cdns3 *cdns)
107	{
108	struct udevice *dev = cdns->dev;
109	enum usb_dr_mode best_dr_mode;
110	enum usb_dr_mode dr_mode;
111	int ret = 0;
112
f10643cf	113	dr_mode = usb_get_dr_mode(dev_ofnode(dev));
7e91f6cc VR	114	cdns->role = USB_ROLE_NONE;
	115
	116	/*
	117	* If driver can't read mode by means of usb_get_dr_mode function then
	118	* chooses mode according with Kernel configuration. This setting
	119	* can be restricted later depending on strap pin configuration.
	120	*/
	121	if (dr_mode == USB_DR_MODE_UNKNOWN) {
	122	if (IS_ENABLED(CONFIG_USB_CDNS3_HOST) &&
	123	IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
	124	dr_mode = USB_DR_MODE_OTG;
	125	else if (IS_ENABLED(CONFIG_USB_CDNS3_HOST))
	126	dr_mode = USB_DR_MODE_HOST;
	127	else if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET))
	128	dr_mode = USB_DR_MODE_PERIPHERAL;
	129	}
	130
	131	/*
	132	* At this point cdns->dr_mode contains strap configuration.
	133	* Driver try update this setting considering kernel configuration
	134	*/
	135	best_dr_mode = cdns->dr_mode;
	136
	137	ret = cdns3_idle_init(cdns);
	138	if (ret)
	139	return ret;
	140
	141	if (dr_mode == USB_DR_MODE_OTG) {
	142	best_dr_mode = cdns->dr_mode;
	143	} else if (cdns->dr_mode == USB_DR_MODE_OTG) {
	144	best_dr_mode = dr_mode;
	145	} else if (cdns->dr_mode != dr_mode) {
	146	dev_err(dev, "Incorrect DRD configuration\n");
	147	return -EINVAL;
	148	}
	149
	150	dr_mode = best_dr_mode;
	151
333e4a62	152	#if defined(CONFIG_SPL_USB_HOST) \|\| !defined(CONFIG_SPL_BUILD)
7e91f6cc VR	153	if (dr_mode == USB_DR_MODE_OTG \|\| dr_mode == USB_DR_MODE_HOST) {
	154	ret = cdns3_host_init(cdns);
	155	if (ret) {
	156	dev_err(dev, "Host initialization failed with %d\n",
	157	ret);
	158	goto err;
	159	}
	160	}
	161	#endif
	162
	163	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	164	if (dr_mode == USB_DR_MODE_OTG \|\| dr_mode == USB_DR_MODE_PERIPHERAL) {
	165	ret = cdns3_gadget_init(cdns);
	166	if (ret) {
	167	dev_err(dev, "Device initialization failed with %d\n",
	168	ret);
	169	goto err;
	170	}
	171	}
	172	#endif
	173
	174	cdns->dr_mode = dr_mode;
	175
	176	ret = cdns3_drd_update_mode(cdns);
	177	if (ret)
	178	goto err;
	179
	180	if (cdns->dr_mode != USB_DR_MODE_OTG) {
	181	ret = cdns3_hw_role_switch(cdns);
	182	if (ret)
	183	goto err;
	184	}
	185
	186	return ret;
	187	err:
	188	cdns3_exit_roles(cdns);
	189	return ret;
	190	}
	191
	192	/**
	193	* cdsn3_hw_role_state_machine - role switch state machine based on hw events
	194	* @cdns: Pointer to controller structure.
	195	*
	196	* Returns next role to be entered based on hw events.
	197	*/
	198	static enum usb_role cdsn3_hw_role_state_machine(struct cdns3 *cdns)
	199	{
	200	enum usb_role role;
	201	int id, vbus;
	202
	203	if (cdns->dr_mode != USB_DR_MODE_OTG)
	204	goto not_otg;
	205
	206	id = cdns3_get_id(cdns);
	207	vbus = cdns3_get_vbus(cdns);
	208
	209	/*
	210	* Role change state machine
	211	* Inputs: ID, VBUS
	212	* Previous state: cdns->role
	213	* Next state: role
	214	*/
	215	role = cdns->role;
	216
217	switch (role) {
218	case USB_ROLE_NONE:
219	/*
220	* Driver treats USB_ROLE_NONE synonymous to IDLE state from
221	* controller specification.
222	*/
223	if (!id)
224	role = USB_ROLE_HOST;
225	else if (vbus)
226	role = USB_ROLE_DEVICE;
227	break;
228	case USB_ROLE_HOST: /* from HOST, we can only change to NONE */
229	if (id)
230	role = USB_ROLE_NONE;
231	break;
232	case USB_ROLE_DEVICE: /* from GADGET, we can only change to NONE*/
233	if (!vbus)
234	role = USB_ROLE_NONE;
235	break;
236	}
237
238	dev_dbg(cdns->dev, "role %d -> %d\n", cdns->role, role);
239
240	return role;
241
242	not_otg:
243	if (cdns3_is_host(cdns))
244	role = USB_ROLE_HOST;
245	if (cdns3_is_device(cdns))
246	role = USB_ROLE_DEVICE;
247
248	return role;
249	}
250
251	static int cdns3_idle_role_start(struct cdns3 *cdns)
252	{
253	return 0;
254	}
255
256	static void cdns3_idle_role_stop(struct cdns3 *cdns)
257	{
258	/* Program Lane swap and bring PHY out of RESET */
259	generic_phy_reset(&cdns->usb3_phy);
260	}
261
262	static int cdns3_idle_init(struct cdns3 *cdns)
263	{
264	struct cdns3_role_driver *rdrv;
265
266	rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
267	if (!rdrv)
268	return -ENOMEM;
269
270	rdrv->start = cdns3_idle_role_start;
271	rdrv->stop = cdns3_idle_role_stop;
272	rdrv->state = CDNS3_ROLE_STATE_INACTIVE;
273	rdrv->suspend = NULL;
274	rdrv->resume = NULL;
275	rdrv->name = "idle";
276
277	cdns->roles[USB_ROLE_NONE] = rdrv;
278
279	return 0;
280	}
281
282	/**
283	* cdns3_hw_role_switch - switch roles based on HW state
284	* @cdns3: controller
285	*/
286	int cdns3_hw_role_switch(struct cdns3 *cdns)
287	{
288	enum usb_role real_role, current_role;
289	int ret = 0;
290
291	/* Do nothing if role based on syfs. */
292	if (cdns->role_override)
293	return 0;
294
295	current_role = cdns->role;
296	real_role = cdsn3_hw_role_state_machine(cdns);
297
298	/* Do nothing if nothing changed */
299	if (current_role == real_role)
300	goto exit;
301
302	cdns3_role_stop(cdns);
303
304	dev_dbg(cdns->dev, "Switching role %d -> %d", current_role, real_role);
305
306	ret = cdns3_role_start(cdns, real_role);
307	if (ret) {
308	/* Back to current role */
309	dev_err(cdns->dev, "set %d has failed, back to %d\n",
310	real_role, current_role);
311	ret = cdns3_role_start(cdns, current_role);
312	if (ret)
313	dev_err(cdns->dev, "back to %d failed too\n",
314	current_role);
315	}
316	exit:
317	return ret;
318	}
319
320	static int cdns3_probe(struct cdns3 *cdns)
321	{
322	struct udevice *dev = cdns->dev;
323	int ret;
324
325	cdns->xhci_regs = dev_remap_addr_name(dev, "xhci");
326	if (!cdns->xhci_regs)
327	return -EINVAL;
328
329	cdns->dev_regs = dev_remap_addr_name(dev, "dev");
330	if (!cdns->dev_regs)
331	return -EINVAL;
332
333	mutex_init(&cdns->mutex);
334
335	ret = generic_phy_get_by_name(dev, "cdns3,usb2-phy", &cdns->usb2_phy);
336	if (ret)
337	dev_warn(dev, "Unable to get USB2 phy (ret %d)\n", ret);
338
339	ret = generic_phy_init(&cdns->usb2_phy);
340	if (ret)
341	return ret;
342
343	ret = generic_phy_get_by_name(dev, "cdns3,usb3-phy", &cdns->usb3_phy);
344	if (ret)
345	dev_warn(dev, "Unable to get USB3 phy (ret %d)\n", ret);
346
347	ret = generic_phy_init(&cdns->usb3_phy);
348	if (ret)
349	return ret;
350
351	ret = generic_phy_power_on(&cdns->usb2_phy);
352	if (ret)
353	return ret;
354
355	ret = generic_phy_power_on(&cdns->usb3_phy);
356	if (ret)
357	return ret;
358
359	ret = cdns3_drd_init(cdns);
360	if (ret)
361	return ret;
362
363	ret = cdns3_core_init_role(cdns);
364	if (ret)
365	return ret;
366
367	dev_dbg(dev, "Cadence USB3 core: probe succeed\n");
368
369	return 0;
370	}
371
372	static int cdns3_remove(struct cdns3 *cdns)
373	{
374	cdns3_exit_roles(cdns);
375	generic_phy_power_off(&cdns->usb2_phy);
376	generic_phy_power_off(&cdns->usb3_phy);
377	generic_phy_exit(&cdns->usb2_phy);
378	generic_phy_exit(&cdns->usb3_phy);
379	return 0;
380	}
381
382	static const struct udevice_id cdns3_ids[] = {
383	{ .compatible = "cdns,usb3" },
384	{ },
385	};
386
387	int cdns3_bind(struct udevice *parent)
388	{
7e91f6cc VR	389	enum usb_dr_mode dr_mode;
	390	struct udevice *dev;
	391	const char *driver;
	392	const char *name;
ac28e59a	393	ofnode node;
7e91f6cc VR	394	int ret;
7e91f6cc VR	395
f10643cf	396	node = ofnode_by_compatible(dev_ofnode(parent), "cdns,usb3");
ac28e59a	397	if (!ofnode_valid(node)) {
7e91f6cc VR	398	ret = -ENODEV;
	399	goto fail;
	400	}
	401
ac28e59a	402	name = ofnode_get_name(node);
7e91f6cc VR	403	dr_mode = usb_get_dr_mode(node);
	404
	405	switch (dr_mode) {
333e4a62	406	#if defined(CONFIG_SPL_USB_HOST) \|\| \
7e91f6cc VR	407	(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
	408	case USB_DR_MODE_HOST:
	409	debug("%s: dr_mode: HOST\n", __func__);
	410	driver = "cdns-usb3-host";
	411	break;
	412	#endif
	413	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	414	case USB_DR_MODE_PERIPHERAL:
	415	debug("%s: dr_mode: PERIPHERAL\n", __func__);
	416	driver = "cdns-usb3-peripheral";
	417	break;
	418	#endif
	419	default:
	420	printf("%s: unsupported dr_mode\n", __func__);
	421	ret = -ENODEV;
	422	goto fail;
	423	};
	424
ac28e59a	425	ret = device_bind_driver_to_node(parent, driver, name, node, &dev);
7e91f6cc VR	426	if (ret) {
	427	printf("%s: not able to bind usb device mode\n",
	428	__func__);
	429	goto fail;
	430	}
	431
	432	return 0;
	433
	434	fail:
	435	/* do not return an error: failing to bind would hang the board */
	436	return 0;
	437	}
	438
	439	#if CONFIG_IS_ENABLED(DM_USB_GADGET)
	440	static int cdns3_gadget_probe(struct udevice *dev)
	441	{
	442	struct cdns3_gadget_priv *priv = dev_get_priv(dev);
	443	struct cdns3 *cdns = &priv->cdns;
	444
	445	cdns->dev = dev;
	446
	447	return cdns3_probe(cdns);
	448	}
	449
	450	static int cdns3_gadget_remove(struct udevice *dev)
	451	{
	452	struct cdns3_gadget_priv *priv = dev_get_priv(dev);
	453	struct cdns3 *cdns = &priv->cdns;
	454
	455	return cdns3_remove(cdns);
	456	}
	457
	458	U_BOOT_DRIVER(cdns_usb3_peripheral) = {
	459	.name = "cdns-usb3-peripheral",
	460	.id = UCLASS_USB_GADGET_GENERIC,
	461	.of_match = cdns3_ids,
	462	.probe = cdns3_gadget_probe,
	463	.remove = cdns3_gadget_remove,
41575d8e	464	.priv_auto = sizeof(struct cdns3_gadget_priv),
7e91f6cc VR	465	.flags = DM_FLAG_ALLOC_PRIV_DMA,
	466	};
	467	#endif
	468
333e4a62	469	#if defined(CONFIG_SPL_USB_HOST) \|\| \
7e91f6cc VR	470	(!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST))
	471	static int cdns3_host_probe(struct udevice *dev)
	472	{
	473	struct cdns3_host_priv *priv = dev_get_priv(dev);
	474	struct cdns3 *cdns = &priv->cdns;
	475
	476	cdns->dev = dev;
	477
	478	return cdns3_probe(cdns);
	479	}
	480
	481	static int cdns3_host_remove(struct udevice *dev)
	482	{
	483	struct cdns3_host_priv *priv = dev_get_priv(dev);
	484	struct cdns3 *cdns = &priv->cdns;
	485
	486	return cdns3_remove(cdns);
	487	}
	488
	489	U_BOOT_DRIVER(cdns_usb3_host) = {
	490	.name = "cdns-usb3-host",
	491	.id = UCLASS_USB,
	492	.of_match = cdns3_ids,
	493	.probe = cdns3_host_probe,
	494	.remove = cdns3_host_remove,
41575d8e	495	.priv_auto = sizeof(struct cdns3_host_priv),
7e91f6cc VR	496	.ops = &xhci_usb_ops,
	497	.flags = DM_FLAG_ALLOC_PRIV_DMA,
	498	};
	499	#endif