linux/drivers/usb/cdns3/core.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Cadence USBSS and USBSSP 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 <linux/dma-mapping.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>

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

static int cdns_idle_init(struct cdns *cdns);

static int cdns_role_start(struct cdns *cdns, enum usb_role role)
{ … }

static void cdns_role_stop(struct cdns *cdns)
{ … }

static void cdns_exit_roles(struct cdns *cdns)
{ … }

/**
 * cdns_core_init_role - initialize role of operation
 * @cdns: Pointer to cdns structure
 *
 * Returns 0 on success otherwise negative errno
 */
static int cdns_core_init_role(struct cdns *cdns)
{ … }

/**
 * cdns_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 cdns_hw_role_state_machine(struct cdns *cdns)
{ … }

static int cdns_idle_role_start(struct cdns *cdns)
{ … }

static void cdns_idle_role_stop(struct cdns *cdns)
{ … }

static int cdns_idle_init(struct cdns *cdns)
{ … }

/**
 * cdns_hw_role_switch - switch roles based on HW state
 * @cdns: controller
 */
int cdns_hw_role_switch(struct cdns *cdns)
{ … }

/**
 * cdns_role_get - get current role of controller.
 *
 * @sw: pointer to USB role switch structure
 *
 * Returns role
 */
static enum usb_role cdns_role_get(struct usb_role_switch *sw)
{ … }

/**
 * cdns_role_set - set current role of controller.
 *
 * @sw: pointer to USB role switch structure
 * @role: the previous role
 * Handles below events:
 * - Role switch for dual-role devices
 * - USB_ROLE_GADGET <--> USB_ROLE_NONE for peripheral-only devices
 */
static int cdns_role_set(struct usb_role_switch *sw, enum usb_role role)
{ … }

/**
 * cdns_wakeup_irq - interrupt handler for wakeup events
 * @irq: irq number for cdns3/cdnsp core device
 * @data: structure of cdns
 *
 * Returns IRQ_HANDLED or IRQ_NONE
 */
static irqreturn_t cdns_wakeup_irq(int irq, void *data)
{ … }

/**
 * cdns_init - probe for cdns3/cdnsp core device
 * @cdns: Pointer to cdns structure.
 *
 * Returns 0 on success otherwise negative errno
 */
int cdns_init(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * cdns_remove - unbind drd driver and clean up
 * @cdns: Pointer to cdns structure.
 *
 * Returns 0 on success otherwise negative errno
 */
int cdns_remove(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

#ifdef CONFIG_PM_SLEEP
int cdns_suspend(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

int cdns_resume(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

void cdns_set_active(struct cdns *cdns, u8 set_active)
{ … }
EXPORT_SYMBOL_GPL(…);
#endif /* CONFIG_PM_SLEEP */

MODULE_AUTHOR(…) …;
MODULE_AUTHOR(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;