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