diff options
Diffstat (limited to 'drivers/net/wireless/bcmdhd/bcmwifi_channels.c')
| -rw-r--r-- | drivers/net/wireless/bcmdhd/bcmwifi_channels.c | 805 |
1 files changed, 509 insertions, 296 deletions
diff --git a/drivers/net/wireless/bcmdhd/bcmwifi_channels.c b/drivers/net/wireless/bcmdhd/bcmwifi_channels.c index 0cbc1cb..f092699 100644 --- a/drivers/net/wireless/bcmdhd/bcmwifi_channels.c +++ b/drivers/net/wireless/bcmdhd/bcmwifi_channels.c @@ -3,7 +3,7 @@ * Contents are wifi-specific, used by any kernel or app-level * software that might want wifi things as it grows. * - * Copyright (C) 1999-2012, Broadcom Corporation + * Copyright (C) 1999-2014, Broadcom Corporation * * Unless you and Broadcom execute a separate written software license * agreement governing use of this software, this software is licensed to you @@ -27,10 +27,10 @@ #include <bcm_cfg.h> #include <typedefs.h> +#include <bcmutils.h> #ifdef BCMDRIVER #include <osl.h> -#include <bcmutils.h> #define strtoul(nptr, endptr, base) bcm_strtoul((nptr), (endptr), (base)) #define tolower(c) (bcm_isupper((c)) ? ((c) + 'a' - 'A') : (c)) #else @@ -40,200 +40,82 @@ #ifndef ASSERT #define ASSERT(exp) #endif -#endif +#endif /* BCMDRIVER */ -#ifdef _bcmwifi_c_ - -#include <bcmwifi.h> -#else #include <bcmwifi_channels.h> -#endif #if defined(WIN32) && (defined(BCMDLL) || defined(WLMDLL)) -#include <bcmstdlib.h> +#include <bcmstdlib.h> /* For wl/exe/GNUmakefile.brcm_wlu and GNUmakefile.wlm_dll */ #endif -#ifndef D11AC_IOTYPES - - - - - - - -char * -wf_chspec_ntoa(chanspec_t chspec, char *buf) -{ - const char *band, *bw, *sb; - uint channel; - - band = ""; - bw = ""; - sb = ""; - channel = CHSPEC_CHANNEL(chspec); - - if ((CHSPEC_IS2G(chspec) && channel > CH_MAX_2G_CHANNEL) || - (CHSPEC_IS5G(chspec) && channel <= CH_MAX_2G_CHANNEL)) - band = (CHSPEC_IS2G(chspec)) ? "b" : "a"; - if (CHSPEC_IS40(chspec)) { - if (CHSPEC_SB_UPPER(chspec)) { - sb = "u"; - channel += CH_10MHZ_APART; - } else { - sb = "l"; - channel -= CH_10MHZ_APART; - } - } else if (CHSPEC_IS10(chspec)) { - bw = "n"; - } - - - snprintf(buf, 6, "%d%s%s%s", channel, band, bw, sb); - return (buf); -} - - -chanspec_t -wf_chspec_aton(const char *a) -{ - char *endp = NULL; - uint channel, band, bw, ctl_sb; - char c; - - channel = strtoul(a, &endp, 10); - - - if (endp == a) - return 0; - - if (channel > MAXCHANNEL) - return 0; - - band = ((channel <= CH_MAX_2G_CHANNEL) ? WL_CHANSPEC_BAND_2G : WL_CHANSPEC_BAND_5G); - bw = WL_CHANSPEC_BW_20; - ctl_sb = WL_CHANSPEC_CTL_SB_NONE; - - a = endp; - - c = tolower(a[0]); - if (c == '\0') - goto done; - - - if (c == 'a' || c == 'b') { - band = (c == 'a') ? WL_CHANSPEC_BAND_5G : WL_CHANSPEC_BAND_2G; - a++; - c = tolower(a[0]); - if (c == '\0') - goto done; - } - - - if (c == 'n') { - bw = WL_CHANSPEC_BW_10; - } else if (c == 'l') { - bw = WL_CHANSPEC_BW_40; - ctl_sb = WL_CHANSPEC_CTL_SB_LOWER; - - if (channel <= (MAXCHANNEL - CH_20MHZ_APART)) - channel += CH_10MHZ_APART; - else - return 0; - } else if (c == 'u') { - bw = WL_CHANSPEC_BW_40; - ctl_sb = WL_CHANSPEC_CTL_SB_UPPER; - - if (channel > CH_20MHZ_APART) - channel -= CH_10MHZ_APART; - else - return 0; - } else { - return 0; - } - -done: - return (channel | band | bw | ctl_sb); -} - - -bool -wf_chspec_malformed(chanspec_t chanspec) -{ - - if (!CHSPEC_IS5G(chanspec) && !CHSPEC_IS2G(chanspec)) - return TRUE; - - if (!CHSPEC_IS40(chanspec) && !CHSPEC_IS20(chanspec)) - return TRUE; - - - if (CHSPEC_IS20(chanspec)) { - if (!CHSPEC_SB_NONE(chanspec)) - return TRUE; - } else { - if (!CHSPEC_SB_UPPER(chanspec) && !CHSPEC_SB_LOWER(chanspec)) - return TRUE; - } - - return FALSE; -} - - -uint8 -wf_chspec_ctlchan(chanspec_t chspec) -{ - uint8 ctl_chan; - - - if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_NONE) { - return CHSPEC_CHANNEL(chspec); - } else { - - ASSERT(CHSPEC_BW(chspec) == WL_CHANSPEC_BW_40); - - if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_UPPER) { - - ctl_chan = UPPER_20_SB(CHSPEC_CHANNEL(chspec)); - } else { - ASSERT(CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_LOWER); - - ctl_chan = LOWER_20_SB(CHSPEC_CHANNEL(chspec)); - } - } - - return ctl_chan; -} - -chanspec_t -wf_chspec_ctlchspec(chanspec_t chspec) -{ - chanspec_t ctl_chspec = 0; - uint8 channel; - - ASSERT(!wf_chspec_malformed(chspec)); - - - if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_NONE) { - return chspec; - } else { - if (CHSPEC_CTL_SB(chspec) == WL_CHANSPEC_CTL_SB_UPPER) { - channel = UPPER_20_SB(CHSPEC_CHANNEL(chspec)); - } else { - channel = LOWER_20_SB(CHSPEC_CHANNEL(chspec)); - } - ctl_chspec = channel | WL_CHANSPEC_BW_20 | WL_CHANSPEC_CTL_SB_NONE; - ctl_chspec |= CHSPEC_BAND(chspec); - } - return ctl_chspec; -} - -#else - - - - +/* Definitions for D11AC capable Chanspec type */ +/* Chanspec ASCII representation with 802.11ac capability: + * [<band> 'g'] <channel> ['/'<bandwidth> [<ctl-sideband>]['/'<1st80channel>'-'<2nd80channel>]] + * + * <band>: + * (optional) 2, 3, 4, 5 for 2.4GHz, 3GHz, 4GHz, and 5GHz respectively. + * Default value is 2g if channel <= 14, otherwise 5g. + * <channel>: + * channel number of the 5MHz, 10MHz, 20MHz channel, + * or primary channel of 40MHz, 80MHz, 160MHz, or 80+80MHz channel. + * <bandwidth>: + * (optional) 5, 10, 20, 40, 80, 160, or 80+80. Default value is 20. + * <primary-sideband>: + * (only for 2.4GHz band 40MHz) U for upper sideband primary, L for lower. + * + * For 2.4GHz band 40MHz channels, the same primary channel may be the + * upper sideband for one 40MHz channel, and the lower sideband for an + * overlapping 40MHz channel. The U/L disambiguates which 40MHz channel + * is being specified. + * + * For 40MHz in the 5GHz band and all channel bandwidths greater than + * 40MHz, the U/L specificaion is not allowed since the channels are + * non-overlapping and the primary sub-band is derived from its + * position in the wide bandwidth channel. + * + * <1st80Channel>: + * <2nd80Channel>: + * Required for 80+80, otherwise not allowed. + * Specifies the center channel of the first and second 80MHz band. + * + * In its simplest form, it is a 20MHz channel number, with the implied band + * of 2.4GHz if channel number <= 14, and 5GHz otherwise. + * + * To allow for backward compatibility with scripts, the old form for + * 40MHz channels is also allowed: <channel><ctl-sideband> + * + * <channel>: + * primary channel of 40MHz, channel <= 14 is 2GHz, otherwise 5GHz + * <ctl-sideband>: + * "U" for upper, "L" for lower (or lower case "u" "l") + * + * 5 GHz Examples: + * Chanspec BW Center Ch Channel Range Primary Ch + * 5g8 20MHz 8 - - + * 52 20MHz 52 - - + * 52/40 40MHz 54 52-56 52 + * 56/40 40MHz 54 52-56 56 + * 52/80 80MHz 58 52-64 52 + * 56/80 80MHz 58 52-64 56 + * 60/80 80MHz 58 52-64 60 + * 64/80 80MHz 58 52-64 64 + * 52/160 160MHz 50 36-64 52 + * 36/160 160MGz 50 36-64 36 + * 36/80+80/42-106 80+80MHz 42,106 36-48,100-112 36 + * + * 2 GHz Examples: + * Chanspec BW Center Ch Channel Range Primary Ch + * 2g8 20MHz 8 - - + * 8 20MHz 8 - - + * 6 20MHz 6 - - + * 6/40l 40MHz 8 6-10 6 + * 6l 40MHz 8 6-10 6 + * 6/40u 40MHz 4 2-6 6 + * 6u 40MHz 4 2-6 6 + */ +/* bandwidth ASCII string */ static const char *wf_chspec_bw_str[] = { "5", @@ -252,26 +134,26 @@ static const uint8 wf_chspec_bw_mhz[] = #define WF_NUM_BW \ (sizeof(wf_chspec_bw_mhz)/sizeof(uint8)) - +/* 40MHz channels in 5GHz band */ static const uint8 wf_5g_40m_chans[] = {38, 46, 54, 62, 102, 110, 118, 126, 134, 142, 151, 159}; #define WF_NUM_5G_40M_CHANS \ (sizeof(wf_5g_40m_chans)/sizeof(uint8)) - +/* 80MHz channels in 5GHz band */ static const uint8 wf_5g_80m_chans[] = {42, 58, 106, 122, 138, 155}; #define WF_NUM_5G_80M_CHANS \ (sizeof(wf_5g_80m_chans)/sizeof(uint8)) - +/* 160MHz channels in 5GHz band */ static const uint8 wf_5g_160m_chans[] = {50, 114}; #define WF_NUM_5G_160M_CHANS \ (sizeof(wf_5g_160m_chans)/sizeof(uint8)) - +/* convert bandwidth from chanspec to MHz */ static uint bw_chspec_to_mhz(chanspec_t chspec) { @@ -281,22 +163,31 @@ bw_chspec_to_mhz(chanspec_t chspec) return (bw >= WF_NUM_BW ? 0 : wf_chspec_bw_mhz[bw]); } - +/* bw in MHz, return the channel count from the center channel to the + * the channel at the edge of the band + */ static uint8 center_chan_to_edge(uint bw) { - + /* edge channels separated by BW - 10MHz on each side + * delta from cf to edge is half of that, + * MHz to channel num conversion is 5MHz/channel + */ return (uint8)(((bw - 20) / 2) / 5); } - +/* return channel number of the low edge of the band + * given the center channel and BW + */ static uint8 channel_low_edge(uint center_ch, uint bw) { return (uint8)(center_ch - center_chan_to_edge(bw)); } - +/* return side band number given center channel and control channel + * return -1 on error + */ static int channel_to_sb(uint center_ch, uint ctl_ch, uint bw) { @@ -304,29 +195,31 @@ channel_to_sb(uint center_ch, uint ctl_ch, uint bw) uint sb; if ((ctl_ch - lowest) % 4) { - + /* bad ctl channel, not mult 4 */ return -1; } sb = ((ctl_ch - lowest) / 4); - + /* sb must be a index to a 20MHz channel in range */ if (sb >= (bw / 20)) { - + /* ctl_ch must have been too high for the center_ch */ return -1; } return sb; } - +/* return control channel given center channel and side band */ static uint8 channel_to_ctl_chan(uint center_ch, uint bw, uint sb) { return (uint8)(channel_low_edge(center_ch, bw) + sb * 4); } - +/* return index of 80MHz channel from channel number + * return -1 on error + */ static int channel_80mhz_to_id(uint ch) { @@ -339,7 +232,11 @@ channel_80mhz_to_id(uint ch) return -1; } - +/* given a chanspec and a string buffer, format the chanspec as a + * string, and return the original pointer a. + * Min buffer length must be CHANSPEC_STR_LEN. + * On error return NULL + */ char * wf_chspec_ntoa(chanspec_t chspec, char *buf) { @@ -351,15 +248,15 @@ wf_chspec_ntoa(chanspec_t chspec, char *buf) band = ""; - + /* check for non-default band spec */ if ((CHSPEC_IS2G(chspec) && CHSPEC_CHANNEL(chspec) > CH_MAX_2G_CHANNEL) || (CHSPEC_IS5G(chspec) && CHSPEC_CHANNEL(chspec) <= CH_MAX_2G_CHANNEL)) band = (CHSPEC_IS2G(chspec)) ? "2g" : "5g"; - + /* ctl channel */ ctl_chan = wf_chspec_ctlchan(chspec); - + /* bandwidth and ctl sideband */ if (CHSPEC_IS20(chspec)) { snprintf(buf, CHANSPEC_STR_LEN, "%s%d", band, ctl_chan); } else if (!CHSPEC_IS8080(chspec)) { @@ -369,32 +266,32 @@ wf_chspec_ntoa(chanspec_t chspec, char *buf) bw = wf_chspec_bw_str[(chspec & WL_CHANSPEC_BW_MASK) >> WL_CHANSPEC_BW_SHIFT]; #ifdef CHANSPEC_NEW_40MHZ_FORMAT - + /* ctl sideband string if needed for 2g 40MHz */ if (CHSPEC_IS40(chspec) && CHSPEC_IS2G(chspec)) { sb = CHSPEC_SB_UPPER(chspec) ? "u" : "l"; } snprintf(buf, CHANSPEC_STR_LEN, "%s%d/%s%s", band, ctl_chan, bw, sb); #else - + /* ctl sideband string instead of BW for 40MHz */ if (CHSPEC_IS40(chspec)) { sb = CHSPEC_SB_UPPER(chspec) ? "u" : "l"; snprintf(buf, CHANSPEC_STR_LEN, "%s%d%s", band, ctl_chan, sb); } else { snprintf(buf, CHANSPEC_STR_LEN, "%s%d/%s", band, ctl_chan, bw); } -#endif +#endif /* CHANSPEC_NEW_40MHZ_FORMAT */ } else { - + /* 80+80 */ uint chan1 = (chspec & WL_CHANSPEC_CHAN1_MASK) >> WL_CHANSPEC_CHAN1_SHIFT; uint chan2 = (chspec & WL_CHANSPEC_CHAN2_MASK) >> WL_CHANSPEC_CHAN2_SHIFT; - + /* convert to channel number */ chan1 = (chan1 < WF_NUM_5G_80M_CHANS) ? wf_5g_80m_chans[chan1] : 0; chan2 = (chan2 < WF_NUM_5G_80M_CHANS) ? wf_5g_80m_chans[chan2] : 0; - + /* Outputs a max of CHANSPEC_STR_LEN chars including '\0' */ snprintf(buf, CHANSPEC_STR_LEN, "%d/80+80/%d-%d", ctl_chan, chan1, chan2); } @@ -408,19 +305,21 @@ read_uint(const char **p, unsigned int *num) char *endp = NULL; val = strtoul(*p, &endp, 10); - + /* if endp is the initial pointer value, then a number was not read */ if (endp == *p) return 0; - + /* advance the buffer pointer to the end of the integer string */ *p = endp; - + /* return the parsed integer */ *num = (unsigned int)val; return 1; } - +/* given a chanspec string, convert to a chanspec. + * On error return 0 + */ chanspec_t wf_chspec_aton(const char *a) { @@ -435,16 +334,16 @@ wf_chspec_aton(const char *a) chspec_sb = 0; chspec_ch = ch1 = ch2 = 0; - + /* parse channel num or band */ if (!read_uint(&a, &num)) return 0; - + /* if we are looking at a 'g', then the first number was a band */ c = tolower((int)a[0]); if (c == 'g') { - a ++; + a ++; /* consume the char */ - + /* band must be "2" or "5" */ if (num == 2) chspec_band = WL_CHANSPEC_BAND_2G; else if (num == 5) @@ -452,43 +351,43 @@ wf_chspec_aton(const char *a) else return 0; - + /* read the channel number */ if (!read_uint(&a, &ctl_ch)) return 0; c = tolower((int)a[0]); } else { - + /* first number is channel, use default for band */ ctl_ch = num; chspec_band = ((ctl_ch <= CH_MAX_2G_CHANNEL) ? WL_CHANSPEC_BAND_2G : WL_CHANSPEC_BAND_5G); } if (c == '\0') { - + /* default BW of 20MHz */ chspec_bw = WL_CHANSPEC_BW_20; goto done_read; } - a ++; + a ++; /* consume the 'u','l', or '/' */ - + /* check 'u'/'l' */ if (c == 'u' || c == 'l') { sb_ul = c; chspec_bw = WL_CHANSPEC_BW_40; goto done_read; } - + /* next letter must be '/' */ if (c != '/') return 0; - + /* read bandwidth */ if (!read_uint(&a, &bw)) return 0; - + /* convert to chspec value */ if (bw == 20) { chspec_bw = WL_CHANSPEC_BW_20; } else if (bw == 40) { @@ -501,63 +400,75 @@ wf_chspec_aton(const char *a) return 0; } - + /* So far we have <band>g<chan>/<bw> + * Can now be followed by u/l if bw = 40, + * or '+80' if bw = 80, to make '80+80' bw. + */ c = tolower((int)a[0]); - + /* if we have a 2g/40 channel, we should have a l/u spec now */ if (chspec_band == WL_CHANSPEC_BAND_2G && bw == 40) { if (c == 'u' || c == 'l') { - a ++; + a ++; /* consume the u/l char */ sb_ul = c; goto done_read; } } - + /* check for 80+80 */ if (c == '+') { - + /* 80+80 */ static const char *plus80 = "80/"; - + /* must be looking at '+80/' + * check and consume this string. + */ chspec_bw = WL_CHANSPEC_BW_8080; - a ++; + a ++; /* consume the char '+' */ - + /* consume the '80/' string */ for (i = 0; i < 3; i++) { if (*a++ != *plus80++) { return 0; } } - + /* read primary 80MHz channel */ if (!read_uint(&a, &ch1)) return 0; - + /* must followed by '-' */ if (a[0] != '-') return 0; - a ++; + a ++; /* consume the char */ - + /* read secondary 80MHz channel */ if (!read_uint(&a, &ch2)) return 0; } done_read: - + /* skip trailing white space */ while (a[0] == ' ') { a ++; } - + /* must be end of string */ if (a[0] != '\0') return 0; - + /* Now have all the chanspec string parts read; + * chspec_band, ctl_ch, chspec_bw, sb_ul, ch1, ch2. + * chspec_band and chspec_bw are chanspec values. + * Need to convert ctl_ch, sb_ul, and ch1,ch2 into + * a center channel (or two) and sideband. + */ - + /* if a sb u/l string was given, just use that, + * guaranteed to be bw = 40 by sting parse. + */ if (sb_ul != '\0') { if (sb_ul == 'l') { chspec_ch = UPPER_20_SB(ctl_ch); @@ -567,14 +478,16 @@ done_read: chspec_sb = WL_CHANSPEC_CTL_SB_LLU; } } - + /* if the bw is 20, center and sideband are trivial */ else if (chspec_bw == WL_CHANSPEC_BW_20) { chspec_ch = ctl_ch; - chspec_sb = 0; + chspec_sb = WL_CHANSPEC_CTL_SB_NONE; } - + /* if the bw is 40/80/160, not 80+80, a single method + * can be used to to find the center and sideband + */ else if (chspec_bw != WL_CHANSPEC_BW_8080) { - + /* figure out ctl sideband based on ctl channel and bandwidth */ const uint8 *center_ch = NULL; int num_ch = 0; int sb = -1; @@ -601,12 +514,12 @@ done_read: } } - + /* check for no matching sb/center */ if (sb < 0) { return 0; } } - + /* Otherwise, bw is 80+80. Figure out channel pair and sb */ else { int ch1_id = 0, ch2_id = 0; int sb; @@ -614,26 +527,28 @@ done_read: ch1_id = channel_80mhz_to_id(ch1); ch2_id = channel_80mhz_to_id(ch2); - + /* validate channels */ if (ch1 >= ch2 || ch1_id < 0 || ch2_id < 0) return 0; - + /* combined channel in chspec */ chspec_ch = (((uint16)ch1_id << WL_CHANSPEC_CHAN1_SHIFT) | ((uint16)ch2_id << WL_CHANSPEC_CHAN2_SHIFT)); - + /* figure out ctl sideband */ - + /* does the primary channel fit with the 1st 80MHz channel ? */ sb = channel_to_sb(ch1, ctl_ch, bw); if (sb < 0) { - + /* no, so does the primary channel fit with the 2nd 80MHz channel ? */ sb = channel_to_sb(ch2, ctl_ch, bw); if (sb < 0) { - + /* no match for ctl_ch to either 80MHz center channel */ return 0; } - + /* sb index is 0-3 for the low 80MHz channel, and 4-7 for + * the high 80MHz channel. Add 4 to to shift to high set. + */ sb += 4; } @@ -648,16 +563,21 @@ done_read: return chspec; } - +/* + * Verify the chanspec is using a legal set of parameters, i.e. that the + * chanspec specified a band, bw, ctl_sb and channel and that the + * combination could be legal given any set of circumstances. + * RETURNS: TRUE is the chanspec is malformed, false if it looks good. + */ bool wf_chspec_malformed(chanspec_t chanspec) { uint chspec_bw = CHSPEC_BW(chanspec); uint chspec_ch = CHSPEC_CHANNEL(chanspec); - + /* must be 2G or 5G band */ if (CHSPEC_IS2G(chanspec)) { - + /* must be valid bandwidth */ if (chspec_bw != WL_CHANSPEC_BW_20 && chspec_bw != WL_CHANSPEC_BW_40) { return TRUE; @@ -666,13 +586,13 @@ wf_chspec_malformed(chanspec_t chanspec) if (chspec_bw == WL_CHANSPEC_BW_8080) { uint ch1_id, ch2_id; - + /* channel number in 80+80 must be in range */ ch1_id = CHSPEC_CHAN1(chanspec); ch2_id = CHSPEC_CHAN2(chanspec); if (ch1_id >= WF_NUM_5G_80M_CHANS || ch2_id >= WF_NUM_5G_80M_CHANS) return TRUE; - + /* ch2 must be above ch1 for the chanspec */ if (ch2_id <= ch1_id) return TRUE; } else if (chspec_bw == WL_CHANSPEC_BW_20 || chspec_bw == WL_CHANSPEC_BW_40 || @@ -682,15 +602,15 @@ wf_chspec_malformed(chanspec_t chanspec) return TRUE; } } else { - + /* invalid bandwidth */ return TRUE; } } else { - + /* must be 2G or 5G band */ return TRUE; } - + /* side band needs to be consistent with bandwidth */ if (chspec_bw == WL_CHANSPEC_BW_20) { if (CHSPEC_CTL_SB(chanspec) != WL_CHANSPEC_CTL_SB_LLL) return TRUE; @@ -705,7 +625,10 @@ wf_chspec_malformed(chanspec_t chanspec) return FALSE; } - +/* + * Verify the chanspec specifies a valid channel according to 802.11. + * RETURNS: TRUE if the chanspec is a valid 802.11 channel + */ bool wf_chspec_valid(chanspec_t chanspec) { @@ -716,7 +639,7 @@ wf_chspec_valid(chanspec_t chanspec) return FALSE; if (CHSPEC_IS2G(chanspec)) { - + /* must be valid bandwidth and channel range */ if (chspec_bw == WL_CHANSPEC_BW_20) { if (chspec_ch >= 1 && chspec_ch <= 14) return TRUE; @@ -731,7 +654,9 @@ wf_chspec_valid(chanspec_t chanspec) ch1 = wf_5g_80m_chans[CHSPEC_CHAN1(chanspec)]; ch2 = wf_5g_80m_chans[CHSPEC_CHAN2(chanspec)]; - + /* the two channels must be separated by more than 80MHz by VHT req, + * and ch2 above ch1 for the chanspec + */ if (ch2 > ch1 + CH_80MHZ_APART) return TRUE; } else { @@ -748,35 +673,44 @@ wf_chspec_valid(chanspec_t chanspec) center_ch = wf_5g_160m_chans; num_ch = WF_NUM_5G_160M_CHANS; } else { - + /* invalid bandwidth */ return FALSE; } - + /* check for a valid center channel */ if (chspec_bw == WL_CHANSPEC_BW_20) { - + /* We don't have an array of legal 20MHz 5G channels, but they are + * each side of the legal 40MHz channels. Check the chanspec + * channel against either side of the 40MHz channels. + */ for (i = 0; i < num_ch; i ++) { if (chspec_ch == (uint)LOWER_20_SB(center_ch[i]) || chspec_ch == (uint)UPPER_20_SB(center_ch[i])) - break; + break; /* match found */ } if (i == num_ch) { - + /* check for channel 165 which is not the side band + * of 40MHz 5G channel + */ + if (chspec_ch == 165) + i = 0; + + /* check for legacy JP channels on failure */ if (chspec_ch == 34 || chspec_ch == 38 || chspec_ch == 42 || chspec_ch == 46) i = 0; } } else { - + /* check the chanspec channel to each legal channel */ for (i = 0; i < num_ch; i ++) { if (chspec_ch == center_ch[i]) - break; + break; /* match found */ } } if (i < num_ch) { - + /* match found */ return TRUE; } } @@ -785,7 +719,11 @@ wf_chspec_valid(chanspec_t chanspec) return FALSE; } - +/* + * This function returns the channel number that control traffic is being sent on, for 20MHz + * channels this is just the channel number, for 40MHZ, 80MHz, 160MHz channels it is the 20MHZ + * sideband depending on the chanspec selected + */ uint8 wf_chspec_ctlchan(chanspec_t chspec) { @@ -795,7 +733,7 @@ wf_chspec_ctlchan(chanspec_t chspec) ASSERT(!wf_chspec_malformed(chspec)); - + /* Is there a sideband ? */ if (CHSPEC_IS20(chspec)) { return CHSPEC_CHANNEL(chspec); } else { @@ -812,7 +750,7 @@ wf_chspec_ctlchan(chanspec_t chspec) sb -= 4; } - + /* convert from channel index to channel number */ center_chan = wf_5g_80m_chans[center_chan]; } else { @@ -824,7 +762,9 @@ wf_chspec_ctlchan(chanspec_t chspec) } } - +/* + * This function returns the chanspec of the control channel of a given chanspec + */ chanspec_t wf_chspec_ctlchspec(chanspec_t chspec) { @@ -833,7 +773,7 @@ wf_chspec_ctlchspec(chanspec_t chspec) ASSERT(!wf_chspec_malformed(chspec)); - + /* Is there a sideband ? */ if (!CHSPEC_IS20(chspec)) { ctl_chan = wf_chspec_ctlchan(chspec); ctl_chspec = ctl_chan | WL_CHANSPEC_BW_20; @@ -842,7 +782,9 @@ wf_chspec_ctlchspec(chanspec_t chspec) return ctl_chspec; } - +/* return chanspec given control channel and bandwidth + * return 0 on error + */ uint16 wf_channel2chspec(uint ctl_ch, uint bw) { @@ -884,7 +826,7 @@ wf_channel2chspec(uint ctl_ch, uint bw) } } - + /* check for no matching sb/center */ if (sb < 0) { return 0; } @@ -892,9 +834,11 @@ wf_channel2chspec(uint ctl_ch, uint bw) return chspec; } -#endif - - +/* + * This function returns the chanspec for the primary 40MHz of an 80MHz channel. + * The control sideband specifies the same 20MHz channel that the 80MHz channel is using + * as the primary 20MHz channel. + */ extern chanspec_t wf_chspec_primary40_chspec(chanspec_t chspec) { chanspec_t chspec40 = chspec; @@ -908,20 +852,20 @@ extern chanspec_t wf_chspec_primary40_chspec(chanspec_t chspec) sb = CHSPEC_CTL_SB(chspec); if (sb == WL_CHANSPEC_CTL_SB_UL) { - + /* Primary 40MHz is on upper side */ sb = WL_CHANSPEC_CTL_SB_L; center_chan += CH_20MHZ_APART; } else if (sb == WL_CHANSPEC_CTL_SB_UU) { - + /* Primary 40MHz is on upper side */ sb = WL_CHANSPEC_CTL_SB_U; center_chan += CH_20MHZ_APART; } else { - - + /* Primary 40MHz is on lower side */ + /* sideband bits are the same for LL/LU and L/U */ center_chan -= CH_20MHZ_APART; } - + /* Create primary 40MHz chanspec */ chspec40 = (WL_CHANSPEC_BAND_5G | WL_CHANSPEC_BW_40 | sb | center_chan); } @@ -929,7 +873,25 @@ extern chanspec_t wf_chspec_primary40_chspec(chanspec_t chspec) return chspec40; } - +/* + * Return the channel number for a given frequency and base frequency. + * The returned channel number is relative to the given base frequency. + * If the given base frequency is zero, a base frequency of 5 GHz is assumed for + * frequencies from 5 - 6 GHz, and 2.407 GHz is assumed for 2.4 - 2.5 GHz. + * + * Frequency is specified in MHz. + * The base frequency is specified as (start_factor * 500 kHz). + * Constants WF_CHAN_FACTOR_2_4_G, WF_CHAN_FACTOR_5_G are defined for + * 2.4 GHz and 5 GHz bands. + * + * The returned channel will be in the range [1, 14] in the 2.4 GHz band + * and [0, 200] otherwise. + * -1 is returned if the start_factor is WF_CHAN_FACTOR_2_4_G and the + * frequency is not a 2.4 GHz channel, or if the frequency is not and even + * multiple of 5 MHz from the base frequency to the base plus 1 GHz. + * + * Reference 802.11 REVma, section 17.3.8.3, and 802.11B section 18.4.6.2 + */ int wf_mhz2channel(uint freq, uint start_factor) { @@ -937,7 +899,7 @@ wf_mhz2channel(uint freq, uint start_factor) uint base; int offset; - + /* take the default channel start frequency */ if (start_factor == 0) { if (freq >= 2400 && freq <= 2500) start_factor = WF_CHAN_FACTOR_2_4_G; @@ -950,25 +912,40 @@ wf_mhz2channel(uint freq, uint start_factor) base = start_factor / 2; - + /* check that the frequency is in 1GHz range of the base */ if ((freq < base) || (freq > base + 1000)) return -1; offset = freq - base; ch = offset / 5; - + /* check that frequency is a 5MHz multiple from the base */ if (offset != (ch * 5)) return -1; - + /* restricted channel range check for 2.4G */ if (start_factor == WF_CHAN_FACTOR_2_4_G && (ch < 1 || ch > 13)) return -1; return ch; } - +/* + * Return the center frequency in MHz of the given channel and base frequency. + * The channel number is interpreted relative to the given base frequency. + * + * The valid channel range is [1, 14] in the 2.4 GHz band and [0, 200] otherwise. + * The base frequency is specified as (start_factor * 500 kHz). + * Constants WF_CHAN_FACTOR_2_4_G, WF_CHAN_FACTOR_4_G, and WF_CHAN_FACTOR_5_G + * are defined for 2.4 GHz, 4 GHz, and 5 GHz bands. + * The channel range of [1, 14] is only checked for a start_factor of + * WF_CHAN_FACTOR_2_4_G (4814 = 2407 * 2). + * Odd start_factors produce channels on .5 MHz boundaries, in which case + * the answer is rounded down to an integral MHz. + * -1 is returned for an out of range channel. + * + * Reference 802.11 REVma, section 17.3.8.3, and 802.11B section 18.4.6.2 + */ int wf_channel2mhz(uint ch, uint start_factor) { @@ -984,3 +961,239 @@ wf_channel2mhz(uint ch, uint start_factor) return freq; } + +/* + * Returns the 80+80 chanspec corresponding to the following input parameters + * + * primary_20mhz - Primary 20 Mhz channel + * chan1 - channel number of first 80 Mhz band + * chan2 - channel number of second 80 Mhz band + * + * parameters chan1 and chan2 are channel numbers in {42, 58, 106, 122, 138, 155} + * + * returns INVCHANSPEC in case of error + */ + +chanspec_t +wf_chspec_get8080_chspec(uint8 primary_20mhz, uint8 chan1, uint8 chan2) +{ + int sb = 0; + uint16 chanspec = 0; + int chan1_id = 0, chan2_id = 0; + + /* does the primary channel fit with the 1st 80MHz channel ? */ + sb = channel_to_sb(chan1, primary_20mhz, 80); + if (sb < 0) { + /* no, so does the primary channel fit with the 2nd 80MHz channel ? */ + sb = channel_to_sb(chan2, primary_20mhz, 80); + if (sb < 0) { + /* no match for ctl_ch to either 80MHz center channel */ + return INVCHANSPEC; + } + /* sb index is 0-3 for the low 80MHz channel, and 4-7 for + * the high 80MHz channel. Add 4 to to shift to high set. + */ + sb += 4; + } + chan1_id = channel_80mhz_to_id(chan1); + chan2_id = channel_80mhz_to_id(chan2); + if (chan1_id == -1 || chan2_id == -1) + return INVCHANSPEC; + + chanspec = (chan1_id << WL_CHANSPEC_CHAN1_SHIFT)| + (chan2_id << WL_CHANSPEC_CHAN2_SHIFT)| + (sb << WL_CHANSPEC_CTL_SB_SHIFT)| + (WL_CHANSPEC_BW_8080)| + (WL_CHANSPEC_BAND_5G); + + return chanspec; + +} + +/* + * This function returns the 80Mhz channel for the given id. + */ +static uint8 +wf_chspec_get80Mhz_ch(uint8 chan_80Mhz_id) +{ + if (chan_80Mhz_id < WF_NUM_5G_80M_CHANS) + return wf_5g_80m_chans[chan_80Mhz_id]; + + return 0; +} + +/* + * Returns the primary 80 Mhz channel for the provided chanspec + * + * chanspec - Input chanspec for which the 80MHz primary channel has to be retrieved + * + * returns -1 in case the provided channel is 20/40 Mhz chanspec + */ + +uint8 +wf_chspec_primary80_channel(chanspec_t chanspec) +{ + uint8 chan1 = 0, chan2 = 0, primary_20mhz = 0, primary80_chan = 0; + int sb = 0; + + primary_20mhz = wf_chspec_ctlchan(chanspec); + + if (CHSPEC_IS80(chanspec)) { + primary80_chan = CHSPEC_CHANNEL(chanspec); + } + else if (CHSPEC_IS8080(chanspec)) { + chan1 = wf_chspec_get80Mhz_ch(CHSPEC_CHAN1(chanspec)); + chan2 = wf_chspec_get80Mhz_ch(CHSPEC_CHAN2(chanspec)); + + /* does the primary channel fit with the 1st 80MHz channel ? */ + sb = channel_to_sb(chan1, primary_20mhz, 80); + if (sb < 0) { + /* no, so does the primary channel fit with the 2nd 80MHz channel ? */ + sb = channel_to_sb(chan2, primary_20mhz, 80); + if (!(sb < 0)) { + primary80_chan = chan2; + } + } + else { + primary80_chan = chan1; + } + } + else if (CHSPEC_IS160(chanspec)) { + chan1 = CHSPEC_CHANNEL(chanspec); + sb = channel_to_sb(chan1, primary_20mhz, 160); + if (!(sb < 0)) { + /* based on the sb value primary 80 channel can be retrieved + * if sb is in range 0 to 3 the lower band is the 80Mhz primary band + */ + if (sb < 4) { + primary80_chan = chan1 - CH_40MHZ_APART; + } + /* if sb is in range 4 to 7 the lower band is the 80Mhz primary band */ + else + { + primary80_chan = chan1 + CH_40MHZ_APART; + } + } + } + else { + /* for 20 and 40 Mhz */ + primary80_chan = -1; + } + return primary80_chan; +} + +/* + * Returns the secondary 80 Mhz channel for the provided chanspec + * + * chanspec - Input chanspec for which the 80MHz secondary channel has to be retrieved + * + * returns -1 in case the provided channel is 20/40 Mhz chanspec + */ +uint8 +wf_chspec_secondary80_channel(chanspec_t chanspec) +{ + uint8 chan1 = 0, chan2 = 0, primary_20mhz = 0, secondary80_chan = 0; + int sb = 0; + + primary_20mhz = wf_chspec_ctlchan(chanspec); + if (CHSPEC_IS80(chanspec)) { + secondary80_chan = -1; + } + else if (CHSPEC_IS8080(chanspec)) { + chan1 = wf_chspec_get80Mhz_ch(CHSPEC_CHAN1(chanspec)); + chan2 = wf_chspec_get80Mhz_ch(CHSPEC_CHAN2(chanspec)); + + /* does the primary channel fit with the 1st 80MHz channel ? */ + sb = channel_to_sb(chan1, primary_20mhz, 80); + if (sb < 0) { + /* no, so does the primary channel fit with the 2nd 80MHz channel ? */ + sb = channel_to_sb(chan2, primary_20mhz, 80); + if (!(sb < 0)) { + secondary80_chan = chan1; + } + } + else { + secondary80_chan = chan2; + } + } + else if (CHSPEC_IS160(chanspec)) { + chan1 = CHSPEC_CHANNEL(chanspec); + sb = channel_to_sb(chan1, primary_20mhz, 160); + if (!(sb < 0)) { + /* based on the sb value secondary 80 channel can be retrieved + *if sb is in range 0 to 3 upper band is the secondary 80Mhz band + */ + if (sb < 4) { + secondary80_chan = chan1 + CH_40MHZ_APART; + } + /* if sb is in range 4 to 7 the lower band is the secondary 80Mhz band */ + else + { + secondary80_chan = chan1 - CH_40MHZ_APART; + } + } + } + else { + /* for 20 and 40 Mhz */ + secondary80_chan = -1; + } + return secondary80_chan; +} + +/* + * This function returns the chanspec for the primary 80MHz of an 160MHz or 80+80 channel. + * + * chanspec - Input chanspec for which the primary 80Mhz chanspec has to be retreived + * + * returns INVCHANSPEC in case the provided channel is 20/40 Mhz chanspec + */ +chanspec_t +wf_chspec_primary80_chspec(chanspec_t chspec) +{ + chanspec_t chspec80; + uint center_chan, chan1 = 0, chan2 = 0; + uint sb; + + ASSERT(!wf_chspec_malformed(chspec)); + if (CHSPEC_IS8080(chspec)) { + chan1 = wf_chspec_get80Mhz_ch(CHSPEC_CHAN1(chspec)); + chan2 = wf_chspec_get80Mhz_ch(CHSPEC_CHAN2(chspec)); + + sb = CHSPEC_CTL_SB(chspec); + + if (sb < 4) { + /* Primary 80MHz is on lower side */ + center_chan = chan1; + } + else + { + /* Primary 80MHz is on upper side */ + center_chan = chan2; + sb -= 4; + } + /* Create primary 80MHz chanspec */ + chspec80 = (WL_CHANSPEC_BAND_5G | WL_CHANSPEC_BW_80 |sb | center_chan); + } + else if (CHSPEC_IS160(chspec)) { + center_chan = CHSPEC_CHANNEL(chspec); + sb = CHSPEC_CTL_SB(chspec); + + if (sb < 4) { + /* Primary 80MHz is on upper side */ + center_chan -= CH_40MHZ_APART; + } + else + { + /* Primary 80MHz is on lower side */ + center_chan += CH_40MHZ_APART; + sb -= 4; + } + /* Create primary 80MHz chanspec */ + chspec80 = (WL_CHANSPEC_BAND_5G | WL_CHANSPEC_BW_80 | sb | center_chan); + } + else + { + chspec80 = INVCHANSPEC; + } + return chspec80; +} |