path: root/drivers/usb/dwc3/ep0.c

// SPDX-License-Identifier: GPL-2.0
/*
 * ep0.c - DesignWare USB3 DRD Controller Endpoint 0 Handling
 *
 * Copyright (C) 2010-2011 Texas Instruments Incorporated - https://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/dma-mapping.h>

#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/composite.h>

#include "core.h"
#include "debug.h"
#include "gadget.h"
#include "io.h"

static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep *dep);
static void __dwc3_ep0_do_control_data(struct dwc3 *dwc,
		struct dwc3_ep *dep, struct dwc3_request *req);
static int dwc3_ep0_delegate_req(struct dwc3 *dwc,
				 struct usb_ctrlrequest *ctrl);

static void dwc3_ep0_prepare_one_trb(struct dwc3_ep *dep,
		dma_addr_t buf_dma, u32 len, u32 type, bool chain)
{
	struct dwc3_trb			*trb;
	struct dwc3			*dwc;

	dwc = dep->dwc;
	trb = &dwc->ep0_trb[dep->trb_enqueue];

	if (chain)
		dep->trb_enqueue++;

	trb->bpl = lower_32_bits(buf_dma);
	trb->bph = upper_32_bits(buf_dma);
	trb->size = len;
	trb->ctrl = type;

	trb->ctrl |= (DWC3_TRB_CTRL_HWO
			| DWC3_TRB_CTRL_ISP_IMI);

	if (chain)
		trb->ctrl |= DWC3_TRB_CTRL_CHN;
	else
		trb->ctrl |= (DWC3_TRB_CTRL_IOC
				| DWC3_TRB_CTRL_LST);

	trace_dwc3_prepare_trb(dep, trb);
}

static int dwc3_ep0_start_trans(struct dwc3_ep *dep)
{
	struct dwc3_gadget_ep_cmd_params params;
	struct dwc3			*dwc;
	int				ret;

	if (dep->flags & DWC3_EP_TRANSFER_STARTED)
		return 0;

	dwc = dep->dwc;

	memset(&params, 0, sizeof(params));
	params.param0 = upper_32_bits(dwc->ep0_trb_addr);
	params.param1 = lower_32_bits(dwc->ep0_trb_addr);

	ret = dwc3_send_gadget_ep_cmd(dep, DWC3_DEPCMD_STARTTRANSFER, &params);
	if (ret < 0)
		return ret;

	dwc->ep0_next_event = DWC3_EP0_COMPLETE;

	return 0;
}

static int __dwc3_gadget_ep0_queue(struct dwc3_ep *dep,
		struct dwc3_request *req)
{
	struct dwc3		*dwc = dep->dwc;

	req->