1/*- 2 * Copyright (c) 2009-2010 Weongyo Jeong <weongyo@freebsd.org> 3 * 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 * without modification. 11 * 2. Redistributions in binary form must reproduce at minimum a disclaimer 12 * similar to the "NO WARRANTY" disclaimer below ("Disclaimer") and any 13 * redistribution must be conditioned upon including a substantially 14 * similar Disclaimer requirement for further binary redistribution. 15 * 16 * NO WARRANTY 17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 * LIMITED TO, THE IMPLIED WARRANTIES OF NONINFRINGEMENT, MERCHANTIBILITY 20 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 21 * THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, 22 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 25 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 27 * THE POSSIBILITY OF SUCH DAMAGES. 28 */ 29 30#include <sys/cdefs.h> 31__FBSDID("$FreeBSD$"); 32 33/* 34 * The Broadcom Wireless LAN controller driver. 35 */ 36 37#include "opt_bwn.h" 38#include "opt_wlan.h" 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/kernel.h> 43#include <sys/malloc.h> 44#include <sys/module.h> 45#include <sys/endian.h> 46#include <sys/errno.h> 47#include <sys/firmware.h> 48#include <sys/lock.h> 49#include <sys/mutex.h> 50#include <machine/bus.h> 51#include <machine/resource.h> 52#include <sys/bus.h> 53#include <sys/rman.h> 54#include <sys/socket.h> 55#include <sys/sockio.h> 56 57#include <net/ethernet.h> 58#include <net/if.h> 59#include <net/if_var.h> 60#include <net/if_arp.h> 61#include <net/if_dl.h> 62#include <net/if_llc.h> 63#include <net/if_media.h> 64#include <net/if_types.h> 65 66#include <dev/pci/pcivar.h> 67#include <dev/pci/pcireg.h> 68 69#include <net80211/ieee80211_var.h> 70#include <net80211/ieee80211_radiotap.h> 71#include <net80211/ieee80211_regdomain.h> 72#include <net80211/ieee80211_phy.h> 73#include <net80211/ieee80211_ratectl.h> 74 75#include <dev/bwn/if_bwnreg.h> 76#include <dev/bwn/if_bwnvar.h> 77 78#include <dev/bwn/if_bwn_debug.h> 79#include <dev/bwn/if_bwn_misc.h> 80#include <dev/bwn/if_bwn_util.h> 81 82unsigned int 83bwn_sqrt(struct bwn_mac *mac, unsigned int x) 84{ 85 /* Table holding (10 * sqrt(x)) for x between 1 and 256. */ 86 static uint8_t sqrt_table[256] = { 87 10, 14, 17, 20, 22, 24, 26, 28, 88 30, 31, 33, 34, 36, 37, 38, 40, 89 41, 42, 43, 44, 45, 46, 47, 48, 90 50, 50, 51, 52, 53, 54, 55, 56, 91 57, 58, 59, 60, 60, 61, 62, 63, 92 64, 64, 65, 66, 67, 67, 68, 69, 93 70, 70, 71, 72, 72, 73, 74, 74, 94 75, 76, 76, 77, 78, 78, 79, 80, 95 80, 81, 81, 82, 83, 83, 84, 84, 96 85, 86, 86, 87, 87, 88, 88, 89, 97 90, 90, 91, 91, 92, 92, 93, 93, 98 94, 94, 95, 95, 96, 96, 97, 97, 99 98, 98, 99, 100, 100, 100, 101, 101, 100 102, 102, 103, 103, 104, 104, 105, 105, 101 106, 106, 107, 107, 108, 108, 109, 109, 102 110, 110, 110, 111, 111, 112, 112, 113, 103 113, 114, 114, 114, 115, 115, 116, 116, 104 117, 117, 117, 118, 118, 119, 119, 120, 105 120, 120, 121, 121, 122, 122, 122, 123, 106 123, 124, 124, 124, 125, 125, 126, 126, 107 126, 127, 127, 128, 128, 128, 129, 129, 108 130, 130, 130, 131, 131, 131, 132, 132, 109 133, 133, 133, 134, 134, 134, 135, 135, 110 136, 136, 136, 137, 137, 137, 138, 138, 111 138, 139, 139, 140, 140, 140, 141, 141, 112 141, 142, 142, 142, 143, 143, 143, 144, 113 144, 144, 145, 145, 145, 146, 146, 146, 114 147, 147, 147, 148, 148, 148, 149, 149, 115 150, 150, 150, 150, 151, 151, 151, 152, 116 152, 152, 153, 153, 153, 154, 154, 154, 117 155, 155, 155, 156, 156, 156, 157, 157, 118 157, 158, 158, 158, 159, 159, 159, 160 119 }; 120 121 if (x == 0) 122 return (0); 123 if (x >= 256) { 124 unsigned int tmp; 125 126 for (tmp = 0; x >= (2 * tmp) + 1; x -= (2 * tmp++) + 1) 127 /* do nothing */ ; 128 return (tmp); 129 } 130 return (sqrt_table[x - 1] / 10); 131} 132