linux/drivers/usb/cdns3/drd.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Cadence USBSS and USBSSP DRD Driver.
 *
 * Copyright (C) 2018-2020 Cadence.
 * Copyright (C) 2019 Texas Instruments
 *
 * Author: Pawel Laszczak <[email protected]>
 *         Roger Quadros <[email protected]>
 *
 */
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/usb/otg.h>

#include "drd.h"
#include "core.h"

/**
 * cdns_set_mode - change mode of OTG Core
 * @cdns: pointer to context structure
 * @mode: selected mode from cdns_role
 *
 * Returns 0 on success otherwise negative errno
 */
static int cdns_set_mode(struct cdns *cdns, enum usb_dr_mode mode)
{ … }

int cdns_get_id(struct cdns *cdns)
{ … }

int cdns_get_vbus(struct cdns *cdns)
{ … }

void cdns_clear_vbus(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

void cdns_set_vbus(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

bool cdns_is_host(struct cdns *cdns)
{ … }

bool cdns_is_device(struct cdns *cdns)
{ … }

/**
 * cdns_otg_disable_irq - Disable all OTG interrupts
 * @cdns: Pointer to controller context structure
 */
static void cdns_otg_disable_irq(struct cdns *cdns)
{ … }

/**
 * cdns_otg_enable_irq - enable id and sess_valid interrupts
 * @cdns: Pointer to controller context structure
 */
static void cdns_otg_enable_irq(struct cdns *cdns)
{ … }

/**
 * cdns_drd_host_on - start host.
 * @cdns: Pointer to controller context structure.
 *
 * Returns 0 on success otherwise negative errno.
 */
int cdns_drd_host_on(struct cdns *cdns)
{ … }

/**
 * cdns_drd_host_off - stop host.
 * @cdns: Pointer to controller context structure.
 */
void cdns_drd_host_off(struct cdns *cdns)
{ … }

/**
 * cdns_drd_gadget_on - start gadget.
 * @cdns: Pointer to controller context structure.
 *
 * Returns 0 on success otherwise negative errno
 */
int cdns_drd_gadget_on(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * cdns_drd_gadget_off - stop gadget.
 * @cdns: Pointer to controller context structure.
 */
void cdns_drd_gadget_off(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * cdns_init_otg_mode - initialize drd controller
 * @cdns: Pointer to controller context structure
 *
 * Returns 0 on success otherwise negative errno
 */
static int cdns_init_otg_mode(struct cdns *cdns)
{ … }

/**
 * cdns_drd_update_mode - initialize mode of operation
 * @cdns: Pointer to controller context structure
 *
 * Returns 0 on success otherwise negative errno
 */
int cdns_drd_update_mode(struct cdns *cdns)
{ … }

static irqreturn_t cdns_drd_thread_irq(int irq, void *data)
{ … }

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

int cdns_drd_init(struct cdns *cdns)
{ … }

int cdns_drd_exit(struct cdns *cdns)
{ … }

/* Indicate the cdns3 core was power lost before */
bool cdns_power_is_lost(struct cdns *cdns)
{ … }
EXPORT_SYMBOL_GPL(…);