fhci-mem.c

Go to the documentation of this file.

/*
 * Freescale QUICC Engine USB Host Controller Driver
 *
 * Copyright (c) Freescale Semicondutor, Inc. 2006.
 *               Shlomi Gridish <[email protected]>
 *               Jerry Huang <[email protected]>
 * Copyright (c) Logic Product Development, Inc. 2007
 *               Peter Barada <[email protected]>
 * Copyright (c) MontaVista Software, Inc. 2008.
 *               Anton Vorontsov <[email protected]>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#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;
}