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- /*
- * Copyright (c) 2009 Atheros Communications Inc.
- *
- * Modified for iPXE by Scott K Logan <logans@cottsay.net> July 2011
- * Original from Linux kernel 3.0.1
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
- #include <ipxe/io.h>
-
- #include "ath.h"
-
- struct io_buffer *ath_rxbuf_alloc(struct ath_common *common,
- u32 len,
- u32 *iob_addr)
- {
- struct io_buffer *iob;
- u32 off;
-
- /*
- * Cache-line-align. This is important (for the
- * 5210 at least) as not doing so causes bogus data
- * in rx'd frames.
- */
-
- /* Note: the kernel can allocate a value greater than
- * what we ask it to give us. We really only need 4 KB as that
- * is this hardware supports and in fact we need at least 3849
- * as that is the MAX AMSDU size this hardware supports.
- * Unfortunately this means we may get 8 KB here from the
- * kernel... and that is actually what is observed on some
- * systems :( */
- iob = alloc_iob(len + common->cachelsz - 1);
- if (iob != NULL) {
- *iob_addr = virt_to_bus(iob->data);
- off = ((unsigned long) iob->data) % common->cachelsz;
- if (off != 0)
- {
- iob_reserve(iob, common->cachelsz - off);
- *iob_addr += common->cachelsz - off;
- }
- } else {
- DBG("ath: iobuffer alloc of size %d failed\n", len);
- return NULL;
- }
-
- return iob;
- }
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