2 * Copyright (c) 2009-2010 Weongyo Jeong <weongyo@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
34 * The Broadcom Wireless LAN controller driver.
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>
49 #include <sys/mutex.h>
50 #include <machine/bus.h>
51 #include <machine/resource.h>
54 #include <sys/socket.h>
55 #include <sys/sockio.h>
57 #include <net/ethernet.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>
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>
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>
78 #include <dev/bwn/if_bwnreg.h>
79 #include <dev/bwn/if_bwnvar.h>
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>
87 bwn_sqrt(struct bwn_mac *mac, unsigned int x)
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
130 for (tmp = 0; x >= (2 * tmp) + 1; x -= (2 * tmp++) + 1)
134 return (sqrt_table[x - 1] / 10);