diff options
Diffstat (limited to 'sys/dev/usb/usb_mbuf.c')
-rw-r--r-- | sys/dev/usb/usb_mbuf.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/sys/dev/usb/usb_mbuf.c b/sys/dev/usb/usb_mbuf.c new file mode 100644 index 0000000..3ae6ee6 --- /dev/null +++ b/sys/dev/usb/usb_mbuf.c @@ -0,0 +1,77 @@ +/* $FreeBSD$ */ +/*- + * Copyright (c) 2008 Hans Petter Selasky. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <dev/usb/usb_core.h> +#include <dev/usb/usb_mbuf.h> + +/*------------------------------------------------------------------------* + * usb2_alloc_mbufs - allocate mbufs to an usbd interface queue + * + * Returns: + * A pointer that should be passed to "free()" when the buffer(s) + * should be released. + *------------------------------------------------------------------------*/ +void * +usb2_alloc_mbufs(struct malloc_type *type, struct usb2_ifqueue *ifq, + uint32_t block_size, uint16_t nblocks) +{ + struct usb2_mbuf *m_ptr; + uint8_t *data_ptr; + void *free_ptr = NULL; + uint32_t alloc_size; + + /* align data */ + block_size += ((-block_size) & (USB_HOST_ALIGN - 1)); + + if (nblocks && block_size) { + + alloc_size = (block_size + sizeof(struct usb2_mbuf)) * nblocks; + + free_ptr = malloc(alloc_size, type, M_WAITOK | M_ZERO); + + if (free_ptr == NULL) { + goto done; + } + m_ptr = free_ptr; + data_ptr = (void *)(m_ptr + nblocks); + + while (nblocks--) { + + m_ptr->cur_data_ptr = + m_ptr->min_data_ptr = data_ptr; + + m_ptr->cur_data_len = + m_ptr->max_data_len = block_size; + + USB_IF_ENQUEUE(ifq, m_ptr); + + m_ptr++; + data_ptr += block_size; + } + } +done: + return (free_ptr); +} |