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
  27 static 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
  34 static 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
  41 static 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
  59 void 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
  65 struct 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
  83 void 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
  89 struct 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 }