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 /* 32 * The Broadcom Wireless LAN controller driver. 33 */ 34 35 #include "opt_bwn.h" 36 #include "opt_wlan.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/kernel.h> 41 #include <sys/malloc.h> 42 #include <sys/module.h> 43 #include <sys/endian.h> 44 #include <sys/errno.h> 45 #include <sys/firmware.h> 46 #include <sys/lock.h> 47 #include <sys/mutex.h> 48 #include <machine/bus.h> 49 #include <machine/resource.h> 50 #include <sys/bus.h> 51 #include <sys/rman.h> 52 #include <sys/socket.h> 53 #include <sys/sockio.h> 54 55 #include <net/ethernet.h> 56 #include <net/if.h> 57 #include <net/if_var.h> 58 #include <net/if_arp.h> 59 #include <net/if_dl.h> 60 #include <net/if_llc.h> 61 #include <net/if_media.h> 62 #include <net/if_types.h> 63 64 #include <dev/pci/pcivar.h> 65 #include <dev/pci/pcireg.h> 66 67 #include <net80211/ieee80211_var.h> 68 #include <net80211/ieee80211_radiotap.h> 69 #include <net80211/ieee80211_regdomain.h> 70 #include <net80211/ieee80211_phy.h> 71 #include <net80211/ieee80211_ratectl.h> 72 73 #include <dev/bwn/if_bwnreg.h> 74 #include <dev/bwn/if_bwnvar.h> 75 76 #include <dev/bwn/if_bwn_debug.h> 77 #include <dev/bwn/if_bwn_misc.h> 78 #include <dev/bwn/if_bwn_util.h> 79 80 unsigned int 81 bwn_sqrt(struct bwn_mac *mac, unsigned int x) 82 { 83 /* Table holding (10 * sqrt(x)) for x between 1 and 256. */ 84 static uint8_t sqrt_table[256] = { 85 10, 14, 17, 20, 22, 24, 26, 28, 86 30, 31, 33, 34, 36, 37, 38, 40, 87 41, 42, 43, 44, 45, 46, 47, 48, 88 50, 50, 51, 52, 53, 54, 55, 56, 89 57, 58, 59, 60, 60, 61, 62, 63, 90 64, 64, 65, 66, 67, 67, 68, 69, 91 70, 70, 71, 72, 72, 73, 74, 74, 92 75, 76, 76, 77, 78, 78, 79, 80, 93 80, 81, 81, 82, 83, 83, 84, 84, 94 85, 86, 86, 87, 87, 88, 88, 89, 95 90, 90, 91, 91, 92, 92, 93, 93, 96 94, 94, 95, 95, 96, 96, 97, 97, 97 98, 98, 99, 100, 100, 100, 101, 101, 98 102, 102, 103, 103, 104, 104, 105, 105, 99 106, 106, 107, 107, 108, 108, 109, 109, 100 110, 110, 110, 111, 111, 112, 112, 113, 101 113, 114, 114, 114, 115, 115, 116, 116, 102 117, 117, 117, 118, 118, 119, 119, 120, 103 120, 120, 121, 121, 122, 122, 122, 123, 104 123, 124, 124, 124, 125, 125, 126, 126, 105 126, 127, 127, 128, 128, 128, 129, 129, 106 130, 130, 130, 131, 131, 131, 132, 132, 107 133, 133, 133, 134, 134, 134, 135, 135, 108 136, 136, 136, 137, 137, 137, 138, 138, 109 138, 139, 139, 140, 140, 140, 141, 141, 110 141, 142, 142, 142, 143, 143, 143, 144, 111 144, 144, 145, 145, 145, 146, 146, 146, 112 147, 147, 147, 148, 148, 148, 149, 149, 113 150, 150, 150, 150, 151, 151, 151, 152, 114 152, 152, 153, 153, 153, 154, 154, 154, 115 155, 155, 155, 156, 156, 156, 157, 157, 116 157, 158, 158, 158, 159, 159, 159, 160 117 }; 118 119 if (x == 0) 120 return (0); 121 if (x >= 256) { 122 unsigned int tmp; 123 124 for (tmp = 0; x >= (2 * tmp) + 1; x -= (2 * tmp++) + 1) 125 /* do nothing */ ; 126 return (tmp); 127 } 128 return (sqrt_table[x - 1] / 10); 129 } 130