alistair23-linux/drivers/usb/host/fhci-mem.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Freescale QUICC Engine USB Host Controller Driver
 *
 * Copyright (c) Freescale Semicondutor, Inc. 2006.
 *               Shlomi Gridish <gridish@freescale.com>
 *               Jerry Huang <Chang-Ming.Huang@freescale.com>
 * Copyright (c) Logic Product Development, Inc. 2007
 *               Peter Barada <peterb@logicpd.com>
 * Copyright (c) MontaVista Software, Inc. 2008.
 *               Anton Vorontsov <avorontsov@ru.mvista.com>
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "fhci.h"

static void init_td(struct td *td)
{
	memset(td, 0, sizeof(*td));
	INIT_LIST_HEAD(&td->node);
	INIT_LIST_HEAD(&td->frame_lh);
}

static void init_ed(struct ed *ed)
{
	memset(ed, 0, sizeof(*ed));
	INIT_LIST_HEAD(&ed->td_list);
	INIT_LIST_HEAD(&ed->node);
}

static struct td *get_empty_td(struct fhci_hcd *fhci)
{
	struct td *td;

	if (!list_empty(&fhci->empty_tds)) {
		td = list_entry(fhci->empty_tds.next, struct td, node);
		list_del(fhci->empty_tds.next);
	} else {
		td = kmalloc(sizeof(*td), GFP_ATOMIC);
		if (!td)
			fhci_err(fhci, "No memory to allocate to TD\n");
		else
			init_td(td);
	}

	return td;
}

void fhci_recycle_empty_td(struct fhci_hcd *fhci, struct td *td)
{
	init_td(td);
	list_add(&td->node, &fhci->empty_tds);
}

struct ed *fhci_get_empty_ed(struct fhci_hcd *fhci)
{
	struct ed *ed;

	if (!list_empty(&fhci->empty_eds)) {
		ed = list_entry(fhci->empty_eds.next, struct ed, node);
		list_del(fhci->empty_eds.next);
	} else {
		ed = kmalloc(sizeof(*ed), GFP_ATOMIC);
		if (!ed)
			fhci_err(fhci, "No memory to allocate to ED\n");
		else
			init_ed(ed);
	}

	return ed;
}

void fhci_recycle_empty_ed(struct fhci_hcd *fhci, struct ed *ed)
{
	init_ed(ed);
	list_add(&ed->node, &fhci->empty_eds);
}

struct td *fhci_td_fill(struct fhci_hcd *fhci, struct urb *urb,
			struct urb_priv *urb_priv, struct ed *ed, u16 index,
			enum fhci_ta_type type, int toggle, u8 *data, u32 len,
			u16 interval, u16 start_frame, bool ioc)
{
	struct td *td = get_empty_td(fhci);

	if (!td)
		return NULL;

	td->urb = urb;
	td->ed = ed;
	td->type = type;
	td->toggle = toggle;
	td->data = data;
	td->len = len;
	td->iso_index = index;
	td->interval = interval;
	td->start_frame = start_frame;
	td->ioc = ioc;
	td->status = USB_TD_OK;

	urb_priv->tds[index] = td;

	return td;
}