cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/wireless/broadcom/brcm80211/brcmsmac/rate.h

/*
 * Copyright (c) 2010 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _BRCM_RATE_H_

#define _BRCM_RATE_H_

#include "types.h"
#include "d11.h"
#include "phy_hal.h"

extern const u8 rate_info[];
extern const struct brcms_c_rateset cck_ofdm_mimo_rates;
extern const struct brcms_c_rateset ofdm_mimo_rates;
extern const struct brcms_c_rateset cck_ofdm_rates;
extern const struct brcms_c_rateset ofdm_rates;
extern const struct brcms_c_rateset cck_rates;
extern const struct brcms_c_rateset gphy_legacy_rates;
extern const struct brcms_c_rateset rate_limit_1_2;


struct brcms_mcs_info {
	/* phy rate in kbps [20Mhz] */
	
u32 phy_rate_20;
	/* phy rate in kbps [40Mhz] */
	
u32 phy_rate_40;
	/* phy rate in kbps [20Mhz] with SGI */
	
u32 phy_rate_20_sgi;
	/* phy rate in kbps [40Mhz] with SGI */
	
u32 phy_rate_40_sgi;
	/* phy ctl byte 3, code rate, modulation type, # of streams */
	
u8 tx_phy_ctl3;
	/* matching legacy ofdm rate in 500bkps */
	
u8 leg_ofdm;
};


#define BRCMS_MAXMCS	32	
/* max valid mcs index */

#define MCS_TABLE_SIZE	33	
/* Number of mcs entries in the table */
extern const struct brcms_mcs_info mcs_table[];


#define MCS_TXS_MASK	0xc0	
/* num tx streams - 1 bit mask */

#define MCS_TXS_SHIFT	6	
/* num tx streams - 1 bit shift */

/* returns num tx streams - 1 */

static inline u8 mcs_2_txstreams(u8 mcs) { return (mcs_table[mcs].tx_phy_ctl3 & MCS_TXS_MASK) >> MCS_TXS_SHIFT; }

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static inline uint mcs_2_rate(u8 mcs, bool is40, bool sgi) { if (sgi) { if (is40) return mcs_table[mcs].phy_rate_40_sgi; return mcs_table[mcs].phy_rate_20_sgi; } if (is40) return mcs_table[mcs].phy_rate_40; return mcs_table[mcs].phy_rate_20; }

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/* Macro to use the rate_info table */ #define BRCMS_RATE_MASK_FULL 0xff /* Rate value mask with basic rate flag */ /* * rate spec : holds rate and mode specific information required to generate a * tx frame. Legacy CCK and OFDM information is held in the same manner as was * done in the past (in the lower byte) the upper 3 bytes primarily hold MIMO * specific information */ /* rate spec bit fields */ /* Either 500Kbps units or MIMO MCS idx */ #define RSPEC_RATE_MASK 0x0000007F /* mimo MCS is stored in RSPEC_RATE_MASK */ #define RSPEC_MIMORATE 0x08000000 /* mimo bw mask */ #define RSPEC_BW_MASK 0x00000700 /* mimo bw shift */ #define RSPEC_BW_SHIFT 8 /* mimo Space/Time/Frequency mode mask */ #define RSPEC_STF_MASK 0x00003800 /* mimo Space/Time/Frequency mode shift */ #define RSPEC_STF_SHIFT 11 /* mimo coding type mask */ #define RSPEC_CT_MASK 0x0000C000 /* mimo coding type shift */ #define RSPEC_CT_SHIFT 14 /* mimo num STC streams per PLCP defn. */ #define RSPEC_STC_MASK 0x00300000 /* mimo num STC streams per PLCP defn. */ #define RSPEC_STC_SHIFT 20 /* mimo bit indicates adv coding in use */ #define RSPEC_LDPC_CODING 0x00400000 /* mimo bit indicates short GI in use */ #define RSPEC_SHORT_GI 0x00800000 /* bit indicates override both rate & mode */ #define RSPEC_OVERRIDE 0x80000000 /* bit indicates override rate only */ #define RSPEC_OVERRIDE_MCS_ONLY 0x40000000
static inline bool rspec_active(u32 rspec) { return rspec & (RSPEC_RATE_MASK | RSPEC_MIMORATE); }

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static inline u8 rspec_phytxbyte2(u32 rspec) { return (rspec & 0xff00) >> 8; }

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static inline u32 rspec_get_bw(u32 rspec) { return (rspec & RSPEC_BW_MASK) >> RSPEC_BW_SHIFT; }

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static inline bool rspec_issgi(u32 rspec) { return (rspec & RSPEC_SHORT_GI) == RSPEC_SHORT_GI; }

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static inline bool rspec_is40mhz(u32 rspec) { u32 bw = rspec_get_bw(rspec); return bw == PHY_TXC1_BW_40MHZ || bw == PHY_TXC1_BW_40MHZ_DUP; }

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static inline uint rspec2rate(u32 rspec) { if (rspec & RSPEC_MIMORATE) return mcs_2_rate(rspec & RSPEC_RATE_MASK, rspec_is40mhz(rspec), rspec_issgi(rspec)); return rspec & RSPEC_RATE_MASK; }

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static inline u8 rspec_mimoplcp3(u32 rspec) { return (rspec & 0xf00000) >> 16; }

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static inline bool plcp3_issgi(u8 plcp) { return (plcp & (RSPEC_SHORT_GI >> 16)) != 0; }

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static inline uint rspec_stc(u32 rspec) { return (rspec & RSPEC_STC_MASK) >> RSPEC_STC_SHIFT; }

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static inline uint rspec_stf(u32 rspec) { return (rspec & RSPEC_STF_MASK) >> RSPEC_STF_SHIFT; }

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static inline bool is_mcs_rate(u32 ratespec) { return (ratespec & RSPEC_MIMORATE) != 0; }

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static inline bool is_ofdm_rate(u32 ratespec) { return !is_mcs_rate(ratespec) && (rate_info[ratespec & RSPEC_RATE_MASK] & BRCMS_RATE_FLAG); }

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static inline bool is_cck_rate(u32 ratespec) { u32 rate = (ratespec & BRCMS_RATE_MASK); return !is_mcs_rate(ratespec) && ( rate == BRCM_RATE_1M || rate == BRCM_RATE_2M || rate == BRCM_RATE_5M5 || rate == BRCM_RATE_11M); }

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static inline bool is_single_stream(u8 mcs) { return mcs <= HIGHEST_SINGLE_STREAM_MCS || mcs == 32; }

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static inline u8 cck_rspec(u8 cck) { return cck & RSPEC_RATE_MASK; }

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/* Convert encoded rate value in plcp header to numerical rates in 500 KHz * increments */
static inline u8 ofdm_phy2mac_rate(u8 rlpt) { return wlc_phy_get_ofdm_rate_lookup()[rlpt & 0x7]; }

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static inline u8 cck_phy2mac_rate(u8 signal) { return signal/5; }

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/* Rates specified in brcms_c_rateset_filter() */ #define BRCMS_RATES_CCK_OFDM 0 #define BRCMS_RATES_CCK 1 #define BRCMS_RATES_OFDM 2 /* sanitize, and sort a rateset with the basic bit(s) preserved, validate * rateset */ bool brcms_c_rate_hwrs_filter_sort_validate(struct brcms_c_rateset *rs, const struct brcms_c_rateset *hw_rs, bool check_brate, u8 txstreams); /* copy rateset src to dst as-is (no masking or sorting) */ void brcms_c_rateset_copy(const struct brcms_c_rateset *src, struct brcms_c_rateset *dst); /* would be nice to have these documented ... */ u32 brcms_c_compute_rspec(struct d11rxhdr *rxh, u8 *plcp); void brcms_c_rateset_filter(struct brcms_c_rateset *src, struct brcms_c_rateset *dst, bool basic_only, u8 rates, uint xmask, bool mcsallow); void brcms_c_rateset_default(struct brcms_c_rateset *rs_tgt, const struct brcms_c_rateset *rs_hw, uint phy_type, int bandtype, bool cck_only, uint rate_mask, bool mcsallow, u8 bw, u8 txstreams); s16 brcms_c_rate_legacy_phyctl(uint rate); void brcms_c_rateset_mcs_upd(struct brcms_c_rateset *rs, u8 txstreams); void brcms_c_rateset_mcs_clear(struct brcms_c_rateset *rateset); void brcms_c_rateset_mcs_build(struct brcms_c_rateset *rateset, u8 txstreams); void brcms_c_rateset_bw_mcs_filter(struct brcms_c_rateset *rateset, u8 bw); #endif /* _BRCM_RATE_H_ */

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