drivers/usb/host/fhci-mem.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Freescale QUICC Engine USB Host Controller Driver
   4  *
   5  * Copyright (c) Freescale Semicondutor, Inc. 2006.
   6  *               Shlomi Gridish <gridish@freescale.com>
   7  *               Jerry Huang <Chang-Ming.Huang@freescale.com>
   8  * Copyright (c) Logic Product Development, Inc. 2007
   9  *               Peter Barada <peterb@logicpd.com>
  10  * Copyright (c) MontaVista Software, Inc. 2008.
  11  *               Anton Vorontsov <avorontsov@ru.mvista.com>
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/types.h>
  16 #include <linux/delay.h>
  17 #include <linux/slab.h>
  18 #include <linux/list.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/hcd.h>
  21 #include "fhci.h"
  22
  23 static void init_td(struct td *td)
  24 {
  25         memset(td, 0, sizeof(*td));
  26         INIT_LIST_HEAD(&td->node);
  27         INIT_LIST_HEAD(&td->frame_lh);
  28 }
  29
  30 static void init_ed(struct ed *ed)
  31 {
  32         memset(ed, 0, sizeof(*ed));
  33         INIT_LIST_HEAD(&ed->td_list);
  34         INIT_LIST_HEAD(&ed->node);
  35 }
  36
  37 static struct td *get_empty_td(struct fhci_hcd *fhci)
  38 {
  39         struct td *td;
  40
  41         if (!list_empty(&fhci->empty_tds)) {
  42                 td = list_entry(fhci->empty_tds.next, struct td, node);
  43                 list_del(fhci->empty_tds.next);
  44         } else {
  45                 td = kmalloc(sizeof(*td), GFP_ATOMIC);
  46                 if (!td)
  47                         fhci_err(fhci, "No memory to allocate to TD\n");
  48                 else
  49                         init_td(td);
  50         }
  51
  52         return td;
  53 }
  54
  55 void fhci_recycle_empty_td(struct fhci_hcd *fhci, struct td *td)
  56 {
  57         init_td(td);
  58         list_add(&td->node, &fhci->empty_tds);
  59 }
  60
  61 struct ed *fhci_get_empty_ed(struct fhci_hcd *fhci)
  62 {
  63         struct ed *ed;
  64
  65         if (!list_empty(&fhci->empty_eds)) {
  66                 ed = list_entry(fhci->empty_eds.next, struct ed, node);
  67                 list_del(fhci->empty_eds.next);
  68         } else {
  69                 ed = kmalloc(sizeof(*ed), GFP_ATOMIC);
  70                 if (!ed)
  71                         fhci_err(fhci, "No memory to allocate to ED\n");
  72                 else
  73                         init_ed(ed);
  74         }
  75
  76         return ed;
  77 }
  78
  79 void fhci_recycle_empty_ed(struct fhci_hcd *fhci, struct ed *ed)
  80 {
  81         init_ed(ed);
  82         list_add(&ed->node, &fhci->empty_eds);
  83 }
  84
  85 struct td *fhci_td_fill(struct fhci_hcd *fhci, struct urb *urb,
  86                         struct urb_priv *urb_priv, struct ed *ed, u16 index,
  87                         enum fhci_ta_type type, int toggle, u8 *data, u32 len,
  88                         u16 interval, u16 start_frame, bool ioc)
  89 {
  90         struct td *td = get_empty_td(fhci);
  91
  92         if (!td)
  93                 return NULL;
  94
  95         td->urb = urb;
  96         td->ed = ed;
  97         td->type = type;
  98         td->toggle = toggle;
  99         td->data = data;
 100         td->len = len;
 101         td->iso_index = index;
 102         td->interval = interval;
 103         td->start_frame = start_frame;
 104         td->ioc = ioc;
 105         td->status = USB_TD_OK;
 106
 107         urb_priv->tds[index] = td;
 108
 109         return td;
 110 }