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

   1/*
   2 * Freescale QUICC Engine USB Host Controller Driver
   3 *
   4 * Copyright (c) Freescale Semicondutor, Inc. 2006.
   5 *               Shlomi Gridish <gridish@freescale.com>
   6 *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   7 * Copyright (c) Logic Product Development, Inc. 2007
   8 *               Peter Barada <peterb@logicpd.com>
   9 * Copyright (c) MontaVista Software, Inc. 2008.
  10 *               Anton Vorontsov <avorontsov@ru.mvista.com>
  11 *
  12 * This program is free software; you can redistribute  it and/or modify it
  13 * under  the terms of  the GNU General  Public License as published by the
  14 * Free Software Foundation;  either version 2 of the  License, or (at your
  15 * option) any later version.
  16 */
  17
  18#include <linux/kernel.h>
  19#include <linux/types.h>
  20#include <linux/delay.h>
  21#include <linux/slab.h>
  22#include <linux/list.h>
  23#include <linux/usb.h>
  24#include <linux/usb/hcd.h>
  25#include "fhci.h"
  26
  27static void init_td(struct td *td)
  28{
  29        memset(td, 0, sizeof(*td));
  30        INIT_LIST_HEAD(&td->node);
  31        INIT_LIST_HEAD(&td->frame_lh);
  32}
  33
  34static void init_ed(struct ed *ed)
  35{
  36        memset(ed, 0, sizeof(*ed));
  37        INIT_LIST_HEAD(&ed->td_list);
  38        INIT_LIST_HEAD(&ed->node);
  39}
  40
  41static struct td *get_empty_td(struct fhci_hcd *fhci)
  42{
  43        struct td *td;
  44
  45        if (!list_empty(&fhci->empty_tds)) {
  46                td = list_entry(fhci->empty_tds.next, struct td, node);
  47                list_del(fhci->empty_tds.next);
  48        } else {
  49                td = kmalloc(sizeof(*td), GFP_ATOMIC);
  50                if (!td)
  51                        fhci_err(fhci, "No memory to allocate to TD\n");
  52                else
  53                        init_td(td);
  54        }
  55
  56        return td;
  57}
  58
  59void fhci_recycle_empty_td(struct fhci_hcd *fhci, struct td *td)
  60{
  61        init_td(td);
  62        list_add(&td->node, &fhci->empty_tds);
  63}
  64
  65struct ed *fhci_get_empty_ed(struct fhci_hcd *fhci)
  66{
  67        struct ed *ed;
  68
  69        if (!list_empty(&fhci->empty_eds)) {
  70                ed = list_entry(fhci->empty_eds.next, struct ed, node);
  71                list_del(fhci->empty_eds.next);
  72        } else {
  73                ed = kmalloc(sizeof(*ed), GFP_ATOMIC);
  74                if (!ed)
  75                        fhci_err(fhci, "No memory to allocate to ED\n");
  76                else
  77                        init_ed(ed);
  78        }
  79
  80        return ed;
  81}
  82
  83void fhci_recycle_empty_ed(struct fhci_hcd *fhci, struct ed *ed)
  84{
  85        init_ed(ed);
  86        list_add(&ed->node, &fhci->empty_eds);
  87}
  88
  89struct td *fhci_td_fill(struct fhci_hcd *fhci, struct urb *urb,
  90                        struct urb_priv *urb_priv, struct ed *ed, u16 index,
  91                        enum fhci_ta_type type, int toggle, u8 *data, u32 len,
  92                        u16 interval, u16 start_frame, bool ioc)
  93{
  94        struct td *td = get_empty_td(fhci);
  95
  96        if (!td)
  97                return NULL;
  98
  99        td->urb = urb;
 100        td->ed = ed;
 101        td->type = type;
 102        td->toggle = toggle;
 103        td->data = data;
 104        td->len = len;
 105        td->iso_index = index;
 106        td->interval = interval;
 107        td->start_frame = start_frame;
 108        td->ioc = ioc;
 109        td->status = USB_TD_OK;
 110
 111        urb_priv->tds[index] = td;
 112
 113        return td;
 114}
 115