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/list.h>
  22 #include <linux/usb.h>
  23 #include "../core/hcd.h"
  24 #include "fhci.h"
  25
  26 static void init_td(struct td *td)
  27 {
  28         memset(td, 0, sizeof(*td));
  29         INIT_LIST_HEAD(&td->node);
  30         INIT_LIST_HEAD(&td->frame_lh);
  31 }
  32
  33 static void init_ed(struct ed *ed)
  34 {
  35         memset(ed, 0, sizeof(*ed));
  36         INIT_LIST_HEAD(&ed->td_list);
  37         INIT_LIST_HEAD(&ed->node);
  38 }
  39
  40 static struct td *get_empty_td(struct fhci_hcd *fhci)
  41 {
  42         struct td *td;
  43
  44         if (!list_empty(&fhci->empty_tds)) {
  45                 td = list_entry(fhci->empty_tds.next, struct td, node);
  46                 list_del(fhci->empty_tds.next);
  47         } else {
  48                 td = kmalloc(sizeof(*td), GFP_ATOMIC);
  49                 if (!td)
  50                         fhci_err(fhci, "No memory to allocate to TD\n");
  51                 else
  52                         init_td(td);
  53         }
  54
  55         return td;
  56 }
  57
  58 void fhci_recycle_empty_td(struct fhci_hcd *fhci, struct td *td)
  59 {
  60         init_td(td);
  61         list_add(&td->node, &fhci->empty_tds);
  62 }
  63
  64 struct ed *fhci_get_empty_ed(struct fhci_hcd *fhci)
  65 {
  66         struct ed *ed;
  67
  68         if (!list_empty(&fhci->empty_eds)) {
  69                 ed = list_entry(fhci->empty_eds.next, struct ed, node);
  70                 list_del(fhci->empty_eds.next);
  71         } else {
  72                 ed = kmalloc(sizeof(*ed), GFP_ATOMIC);
  73                 if (!ed)
  74                         fhci_err(fhci, "No memory to allocate to ED\n");
  75                 else
  76                         init_ed(ed);
  77         }
  78
  79         return ed;
  80 }
  81
  82 void fhci_recycle_empty_ed(struct fhci_hcd *fhci, struct ed *ed)
  83 {
  84         init_ed(ed);
  85         list_add(&ed->node, &fhci->empty_eds);
  86 }
  87
  88 struct td *fhci_td_fill(struct fhci_hcd *fhci, struct urb *urb,
  89                         struct urb_priv *urb_priv, struct ed *ed, u16 index,
  90                         enum fhci_ta_type type, int toggle, u8 *data, u32 len,
  91                         u16 interval, u16 start_frame, bool ioc)
  92 {
  93         struct td *td = get_empty_td(fhci);
  94
  95         if (!td)
  96                 return NULL;
  97
  98         td->urb = urb;
  99         td->ed = ed;
 100         td->type = type;
 101         td->toggle = toggle;
 102         td->data = data;
 103         td->len = len;
 104         td->iso_index = index;
 105         td->interval = interval;
 106         td->start_frame = start_frame;
 107         td->ioc = ioc;
 108         td->status = USB_TD_OK;
 109
 110         urb_priv->tds[index] = td;
 111
 112         return td;
 113 }