1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include "implementation/global_implementation.h"
29
30 /*------------------------------------------------------------------------*
31 * usb_alloc_mbufs - allocate mbufs to an usbd interface queue
32 *
33 * Returns:
34 * A pointer that should be passed to "free()" when the buffer(s)
35 * should be released.
36 *------------------------------------------------------------------------*/
37 void *
usb_alloc_mbufs(struct malloc_type * type,struct usb_ifqueue * ifq,usb_size_t block_size,uint16_t nblocks)38 usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
39 usb_size_t block_size, uint16_t nblocks)
40 {
41 struct usb_mbuf *m_ptr;
42 uint8_t *data_ptr;
43 void *free_ptr = NULL;
44 usb_size_t alloc_size;
45
46 /* align data */
47 block_size += ((-block_size) & (USB_HOST_ALIGN - 1));
48
49 if (nblocks && block_size) {
50 alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks;
51
52 free_ptr = zalloc(alloc_size);
53
54 if (free_ptr == NULL) {
55 goto done;
56 }
57 m_ptr = free_ptr;
58 data_ptr = (void *)(m_ptr + nblocks);
59
60 while (nblocks--) {
61
62 m_ptr->cur_data_ptr =
63 m_ptr->min_data_ptr = data_ptr;
64
65 m_ptr->cur_data_len =
66 m_ptr->max_data_len = block_size;
67
68 USB_IF_ENQUEUE(ifq, m_ptr);
69
70 m_ptr++;
71 data_ptr += block_size;
72 }
73 }
74 done:
75 return (free_ptr);
76 }
77