Staging: Add initial release of brcm80211 - Broadcom 802.11n wireless LAN driver.

Signed-off-by: Henry Ptasinski <henryp@broadcom.com>
Cc: Brett Rudley <brudley@broadcom.com>
Cc: Nohee Ko <noheek@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 86 insertions, 0 deletions

diff --git a/drivers/staging/brcm80211/include/bitfuncs.h b/drivers/staging/brcm80211/include/bitfuncs.h
new file mode 100644
index 0000000..18842ef
--- /dev/null
+++ b/drivers/staging/brcm80211/include/bitfuncs.h
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2010 Broadcom Corporation
+ *
+ * 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.
+ */
+
+#ifndef _BITFUNCS_H
+#define _BITFUNCS_H
+
+#include <typedefs.h>
+
+/* local prototypes */
+static INLINE uint32 find_msbit(uint32 x);
+
+/*
+ * find_msbit: returns index of most significant set bit in x, with index
+ *   range defined as 0-31.  NOTE: returns zero if input is zero.
+ */
+
+#if defined(USE_PENTIUM_BSR) && defined(__GNUC__)
+
+/*
+ * Implementation for Pentium processors and gcc.  Note that this
+ * instruction is actually very slow on some processors (e.g., family 5,
+ * model 2, stepping 12, "Pentium 75 - 200"), so we use the generic
+ * implementation instead.
+ */
+static INLINE uint32 find_msbit(uint32 x)
+{
+	uint msbit;
+ __asm__("bsrl %1,%0":"=r"(msbit)
+ :		"r"(x));
+	return msbit;
+}
+
+#else				/* !USE_PENTIUM_BSR || !__GNUC__ */
+
+/*
+ * Generic Implementation
+ */
+
+#define DB_POW_MASK16	0xffff0000
+#define DB_POW_MASK8	0x0000ff00
+#define DB_POW_MASK4	0x000000f0
+#define DB_POW_MASK2	0x0000000c
+#define DB_POW_MASK1	0x00000002
+
+static INLINE uint32 find_msbit(uint32 x)
+{
+	uint32 temp_x = x;
+	uint msbit = 0;
+	if (temp_x & DB_POW_MASK16) {
+		temp_x >>= 16;
+		msbit = 16;
+	}
+	if (temp_x & DB_POW_MASK8) {
+		temp_x >>= 8;
+		msbit += 8;
+	}
+	if (temp_x & DB_POW_MASK4) {
+		temp_x >>= 4;
+		msbit += 4;
+	}
+	if (temp_x & DB_POW_MASK2) {
+		temp_x >>= 2;
+		msbit += 2;
+	}
+	if (temp_x & DB_POW_MASK1) {
+		msbit += 1;
+	}
+	return (msbit);
+}
+
+#endif				/* USE_PENTIUM_BSR && __GNUC__ */
+
+#endif				/* _BITFUNCS_H */