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