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
23static 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
30static 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
37static 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
55void 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
61struct 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
79void 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
85struct 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}
111