1 /* $FreeBSD: head/sys/dev/usb/usb_mbuf.c 246122 2013-01-30 15:26:04Z hselasky $ */
2 /*-
3 * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/stdint.h>
28 #include <sys/param.h>
29 #include <sys/queue.h>
30 #include <sys/types.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/bus.h>
34 #include <sys/module.h>
35 #include <sys/lock.h>
36 #include <sys/condvar.h>
37 #include <sys/sysctl.h>
38 #include <sys/unistd.h>
39 #include <sys/callout.h>
40 #include <sys/malloc.h>
41 #include <sys/caps.h>
42
43 #include <bus/u4b/usb.h>
44 #include <bus/u4b/usbdi.h>
45 #include <bus/u4b/usb_dev.h>
46 #include <bus/u4b/usb_mbuf.h>
47
48 /*------------------------------------------------------------------------*
49 * usb_alloc_mbufs - allocate mbufs to an usbd interface queue
50 *
51 * Returns:
52 * A pointer that should be passed to "free()" when the buffer(s)
53 * should be released.
54 *------------------------------------------------------------------------*/
55 void *
usb_alloc_mbufs(struct malloc_type * type,struct usb_ifqueue * ifq,usb_size_t block_size,uint16_t nblocks)56 usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
57 usb_size_t block_size, uint16_t nblocks)
58 {
59 struct usb_mbuf *m_ptr;
60 uint8_t *data_ptr;
61 void *free_ptr = NULL;
62 usb_size_t alloc_size;
63
64 /* align data */
65 block_size += ((-block_size) & (USB_HOST_ALIGN - 1));
66
67 if (nblocks && block_size) {
68
69 alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks;
70
71 free_ptr = kmalloc(alloc_size, type, M_WAITOK | M_ZERO);
72
73 if (free_ptr == NULL) {
74 goto done;
75 }
76 m_ptr = free_ptr;
77 data_ptr = (void *)(m_ptr + nblocks);
78
79 while (nblocks--) {
80
81 m_ptr->cur_data_ptr =
82 m_ptr->min_data_ptr = data_ptr;
83
84 m_ptr->cur_data_len =
85 m_ptr->max_data_len = block_size;
86
87 USB_IF_ENQUEUE(ifq, m_ptr);
88
89 m_ptr++;
90 data_ptr += block_size;
91 }
92 }
93 done:
94 return (free_ptr);
95 }
96