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5b435de0d7
Add the brcm80211 tree to drivers/net/wireless, and disable the version that's in drivers/staging. This version includes the sources currently in staging, plus any changes that have been sent out for review. Sources in staging will be deleted in a followup patch. Signed-off-by: Arend van Spriel <arend@broadcom.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
137 lines
4.3 KiB
C
137 lines
4.3 KiB
C
/*
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* Copyright (c) 2010 Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <brcmu_wifi.h>
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/*
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* Verify the chanspec is using a legal set of parameters, i.e. that the
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* chanspec specified a band, bw, ctl_sb and channel and that the
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* combination could be legal given any set of circumstances.
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* RETURNS: true is the chanspec is malformed, false if it looks good.
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*/
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bool brcmu_chspec_malformed(u16 chanspec)
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{
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/* must be 2G or 5G band */
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if (!CHSPEC_IS5G(chanspec) && !CHSPEC_IS2G(chanspec))
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return true;
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/* must be 20 or 40 bandwidth */
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if (!CHSPEC_IS40(chanspec) && !CHSPEC_IS20(chanspec))
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return true;
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/* 20MHZ b/w must have no ctl sb, 40 must have a ctl sb */
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if (CHSPEC_IS20(chanspec)) {
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if (!CHSPEC_SB_NONE(chanspec))
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return true;
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} else if (!CHSPEC_SB_UPPER(chanspec) && !CHSPEC_SB_LOWER(chanspec)) {
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return true;
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}
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return false;
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}
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EXPORT_SYMBOL(brcmu_chspec_malformed);
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/*
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* This function returns the channel number that control traffic is being sent
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* on, for legacy channels this is just the channel number, for 40MHZ channels
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* it is the upper or lower 20MHZ sideband depending on the chanspec selected.
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*/
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u8 brcmu_chspec_ctlchan(u16 chspec)
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{
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u8 ctl_chan;
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/* Is there a sideband ? */
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if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_NONE) {
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return CHSPEC_CHANNEL(chspec);
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} else {
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/*
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* we only support 40MHZ with sidebands. chanspec channel holds
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* the centre frequency, use that and the side band information
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* to reconstruct the control channel number
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*/
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if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_UPPER)
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/*
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* control chan is the upper 20 MHZ SB of the
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* 40MHZ channel
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*/
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ctl_chan = upper_20_sb(CHSPEC_CHANNEL(chspec));
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else
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/*
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* control chan is the lower 20 MHZ SB of the
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* 40MHZ channel
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*/
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ctl_chan = lower_20_sb(CHSPEC_CHANNEL(chspec));
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}
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return ctl_chan;
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}
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EXPORT_SYMBOL(brcmu_chspec_ctlchan);
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/*
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* Return the channel number for a given frequency and base frequency.
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* The returned channel number is relative to the given base frequency.
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* If the given base frequency is zero, a base frequency of 5 GHz is assumed for
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* frequencies from 5 - 6 GHz, and 2.407 GHz is assumed for 2.4 - 2.5 GHz.
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*
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* Frequency is specified in MHz.
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* The base frequency is specified as (start_factor * 500 kHz).
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* Constants WF_CHAN_FACTOR_2_4_G, WF_CHAN_FACTOR_5_G are defined for
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* 2.4 GHz and 5 GHz bands.
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*
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* The returned channel will be in the range [1, 14] in the 2.4 GHz band
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* and [0, 200] otherwise.
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* -1 is returned if the start_factor is WF_CHAN_FACTOR_2_4_G and the
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* frequency is not a 2.4 GHz channel, or if the frequency is not and even
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* multiple of 5 MHz from the base frequency to the base plus 1 GHz.
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*
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* Reference 802.11 REVma, section 17.3.8.3, and 802.11B section 18.4.6.2
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*/
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int brcmu_mhz2channel(uint freq, uint start_factor)
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{
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int ch = -1;
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uint base;
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int offset;
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/* take the default channel start frequency */
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if (start_factor == 0) {
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if (freq >= 2400 && freq <= 2500)
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start_factor = WF_CHAN_FACTOR_2_4_G;
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else if (freq >= 5000 && freq <= 6000)
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start_factor = WF_CHAN_FACTOR_5_G;
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}
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if (freq == 2484 && start_factor == WF_CHAN_FACTOR_2_4_G)
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return 14;
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base = start_factor / 2;
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/* check that the frequency is in 1GHz range of the base */
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if ((freq < base) || (freq > base + 1000))
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return -1;
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offset = freq - base;
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ch = offset / 5;
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/* check that frequency is a 5MHz multiple from the base */
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if (offset != (ch * 5))
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return -1;
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/* restricted channel range check for 2.4G */
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if (start_factor == WF_CHAN_FACTOR_2_4_G && (ch < 1 || ch > 13))
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return -1;
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return ch;
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}
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EXPORT_SYMBOL(brcmu_mhz2channel);
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