/* * Copyright (C) 2010 Bruno Randolf * * 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. */ #include "ath5k.h" #include "base.h" #include "reg.h" #include "debug.h" #include "ani.h" /** * DOC: Basic ANI Operation * * Adaptive Noise Immunity (ANI) controls five noise immunity parameters * depending on the amount of interference in the environment, increasing * or reducing sensitivity as necessary. * * The parameters are: * - "noise immunity" * - "spur immunity" * - "firstep level" * - "OFDM weak signal detection" * - "CCK weak signal detection" * * Basically we look at the amount of ODFM and CCK timing errors we get and then * raise or lower immunity accordingly by setting one or more of these * parameters. * Newer chipsets have PHY error counters in hardware which will generate a MIB * interrupt when they overflow. Older hardware has too enable PHY error frames * by setting a RX flag and then count every single PHY error. When a specified * threshold of errors has been reached we will raise immunity. * Also we regularly check the amount of errors and lower or raise immunity as * necessary. */ /*** ANI parameter control ***/ /** * ath5k_ani_set_noise_immunity_level() - Set noise immunity level * * @level: level between 0 and @ATH5K_ANI_MAX_NOISE_IMM_LVL */ void ath5k_ani_set_noise_immunity_level(struct ath5k_hw *ah, int level) { /* TODO: * ANI documents suggest the following five levels to use, but the HAL * and ath9k use only use the last two levels, making this * essentially an on/off option. There *may* be a reason for this (???), * so i stick with the HAL version for now... */ #if 0 const s8 hi[] = { -18, -18, -16, -14, -12 }; const s8 lo[] = { -52, -56, -60, -64, -70 }; const s8 sz[] = { -34, -41, -48, -55, -62 }; const s8 fr[] = { -70, -72, -75, -78, -80 }; #else const s8 sz[] = { -55, -62 }; const s8 lo[] = { -64, -70 }; const s8 hi[] = { -14, -12 }; const s8 fr[] = { -78, -80 }; #endif if (level < 0 || level > ARRAY_SIZE(sz)) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "level out of range %d", level); return; } AR5K_REG_WRITE_BITS(ah, AR5K_PHY_DESIRED_SIZE, AR5K_PHY_DESIRED_SIZE_TOT, sz[level]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_AGCCOARSE, AR5K_PHY_AGCCOARSE_LO, lo[level]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_AGCCOARSE, AR5K_PHY_AGCCOARSE_HI, hi[level]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_SIG, AR5K_PHY_SIG_FIRPWR, fr[level]); ah->ah_sc->ani_state.noise_imm_level = level; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "new level %d", level); } /** * ath5k_ani_set_spur_immunity_level() - Set spur immunity level * * @level: level between 0 and @max_spur_level (the maximum level is dependent * on the chip revision). */ void ath5k_ani_set_spur_immunity_level(struct ath5k_hw *ah, int level) { const int val[] = { 2, 4, 6, 8, 10, 12, 14, 16 }; if (level < 0 || level > ARRAY_SIZE(val) || level > ah->ah_sc->ani_state.max_spur_level) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "level out of range %d", level); return; } AR5K_REG_WRITE_BITS(ah, AR5K_PHY_OFDM_SELFCORR, AR5K_PHY_OFDM_SELFCORR_CYPWR_THR1, val[level]); ah->ah_sc->ani_state.spur_level = level; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "new level %d", level); } /** * ath5k_ani_set_firstep_level() - Set "firstep" level * * @level: level between 0 and @ATH5K_ANI_MAX_FIRSTEP_LVL */ void ath5k_ani_set_firstep_level(struct ath5k_hw *ah, int level) { const int val[] = { 0, 4, 8 }; if (level < 0 || level > ARRAY_SIZE(val)) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "level out of range %d", level); return; } AR5K_REG_WRITE_BITS(ah, AR5K_PHY_SIG, AR5K_PHY_SIG_FIRSTEP, val[level]); ah->ah_sc->ani_state.firstep_level = level; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "new level %d", level); } /** * ath5k_ani_set_ofdm_weak_signal_detection() - Control OFDM weak signal * detection * * @on: turn on or off */ void ath5k_ani_set_ofdm_weak_signal_detection(struct ath5k_hw *ah, bool on) { const int m1l[] = { 127, 50 }; const int m2l[] = { 127, 40 }; const int m1[] = { 127, 0x4d }; const int m2[] = { 127, 0x40 }; const int m2cnt[] = { 31, 16 }; const int m2lcnt[] = { 63, 48 }; AR5K_REG_WRITE_BITS(ah, AR5K_PHY_WEAK_OFDM_LOW_THR, AR5K_PHY_WEAK_OFDM_LOW_THR_M1, m1l[on]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_WEAK_OFDM_LOW_THR, AR5K_PHY_WEAK_OFDM_LOW_THR_M2, m2l[on]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_WEAK_OFDM_HIGH_THR, AR5K_PHY_WEAK_OFDM_HIGH_THR_M1, m1[on]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_WEAK_OFDM_HIGH_THR, AR5K_PHY_WEAK_OFDM_HIGH_THR_M2, m2[on]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_WEAK_OFDM_HIGH_THR, AR5K_PHY_WEAK_OFDM_HIGH_THR_M2_COUNT, m2cnt[on]); AR5K_REG_WRITE_BITS(ah, AR5K_PHY_WEAK_OFDM_LOW_THR, AR5K_PHY_WEAK_OFDM_LOW_THR_M2_COUNT, m2lcnt[on]); if (on) AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_WEAK_OFDM_LOW_THR, AR5K_PHY_WEAK_OFDM_LOW_THR_SELFCOR_EN); else AR5K_REG_DISABLE_BITS(ah, AR5K_PHY_WEAK_OFDM_LOW_THR, AR5K_PHY_WEAK_OFDM_LOW_THR_SELFCOR_EN); ah->ah_sc->ani_state.ofdm_weak_sig = on; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "turned %s", on ? "on" : "off"); } /** * ath5k_ani_set_cck_weak_signal_detection() - control CCK weak signal detection * * @on: turn on or off */ void ath5k_ani_set_cck_weak_signal_detection(struct ath5k_hw *ah, bool on) { const int val[] = { 8, 6 }; AR5K_REG_WRITE_BITS(ah, AR5K_PHY_CCK_CROSSCORR, AR5K_PHY_CCK_CROSSCORR_WEAK_SIG_THR, val[on]); ah->ah_sc->ani_state.cck_weak_sig = on; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "turned %s", on ? "on" : "off"); } /*** ANI algorithm ***/ /** * ath5k_ani_raise_immunity() - Increase noise immunity * * @ofdm_trigger: If this is true we are called because of too many OFDM errors, * the algorithm will tune more parameters then. * * Try to raise noise immunity (=decrease sensitivity) in several steps * depending on the average RSSI of the beacons we received. */ static void ath5k_ani_raise_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as, bool ofdm_trigger) { int rssi = ah->ah_beacon_rssi_avg.avg; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "raise immunity (%s)", ofdm_trigger ? "ODFM" : "CCK"); /* first: raise noise immunity */ if (as->noise_imm_level < ATH5K_ANI_MAX_NOISE_IMM_LVL) { ath5k_ani_set_noise_immunity_level(ah, as->noise_imm_level + 1); return; } /* only OFDM: raise spur immunity level */ if (ofdm_trigger && as->spur_level < ah->ah_sc->ani_state.max_spur_level) { ath5k_ani_set_spur_immunity_level(ah, as->spur_level + 1); return; } /* AP mode */ if (ah->ah_sc->opmode == NL80211_IFTYPE_AP) { if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL) ath5k_ani_set_firstep_level(ah, as->firstep_level + 1); return; } /* STA and IBSS mode */ /* TODO: for IBSS mode it would be better to keep a beacon RSSI average * per each neighbour node and use the minimum of these, to make sure we * don't shut out a remote node by raising immunity too high. */ if (rssi > ATH5K_ANI_RSSI_THR_HIGH) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "beacon RSSI high"); /* only OFDM: beacon RSSI is high, we can disable ODFM weak * signal detection */ if (ofdm_trigger && as->ofdm_weak_sig == true) { ath5k_ani_set_ofdm_weak_signal_detection(ah, false); ath5k_ani_set_spur_immunity_level(ah, 0); return; } /* as a last resort or CCK: raise firstep level */ if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL) { ath5k_ani_set_firstep_level(ah, as->firstep_level + 1); return; } } else if (rssi > ATH5K_ANI_RSSI_THR_LOW) { /* beacon RSSI in mid range, we need OFDM weak signal detect, * but can raise firstep level */ ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "beacon RSSI mid"); if (ofdm_trigger && as->ofdm_weak_sig == false) ath5k_ani_set_ofdm_weak_signal_detection(ah, true); if (as->firstep_level < ATH5K_ANI_MAX_FIRSTEP_LVL) ath5k_ani_set_firstep_level(ah, as->firstep_level + 1); return; } else if (ah->ah_current_channel->band == IEEE80211_BAND_2GHZ) { /* beacon RSSI is low. in B/G mode turn of OFDM weak signal * detect and zero firstep level to maximize CCK sensitivity */ ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "beacon RSSI low, 2GHz"); if (ofdm_trigger && as->ofdm_weak_sig == true) ath5k_ani_set_ofdm_weak_signal_detection(ah, false); if (as->firstep_level > 0) ath5k_ani_set_firstep_level(ah, 0); return; } /* TODO: why not?: if (as->cck_weak_sig == true) { ath5k_ani_set_cck_weak_signal_detection(ah, false); } */ } /** * ath5k_ani_lower_immunity() - Decrease noise immunity * * Try to lower noise immunity (=increase sensitivity) in several steps * depending on the average RSSI of the beacons we received. */ static void ath5k_ani_lower_immunity(struct ath5k_hw *ah, struct ath5k_ani_state *as) { int rssi = ah->ah_beacon_rssi_avg.avg; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "lower immunity"); if (ah->ah_sc->opmode == NL80211_IFTYPE_AP) { /* AP mode */ if (as->firstep_level > 0) { ath5k_ani_set_firstep_level(ah, as->firstep_level - 1); return; } } else { /* STA and IBSS mode (see TODO above) */ if (rssi > ATH5K_ANI_RSSI_THR_HIGH) { /* beacon signal is high, leave OFDM weak signal * detection off or it may oscillate * TODO: who said it's off??? */ } else if (rssi > ATH5K_ANI_RSSI_THR_LOW) { /* beacon RSSI is mid-range: turn on ODFM weak signal * detection and next, lower firstep level */ if (as->ofdm_weak_sig == false) { ath5k_ani_set_ofdm_weak_signal_detection(ah, true); return; } if (as->firstep_level > 0) { ath5k_ani_set_firstep_level(ah, as->firstep_level - 1); return; } } else { /* beacon signal is low: only reduce firstep level */ if (as->firstep_level > 0) { ath5k_ani_set_firstep_level(ah, as->firstep_level - 1); return; } } } /* all modes */ if (as->spur_level > 0) { ath5k_ani_set_spur_immunity_level(ah, as->spur_level - 1); return; } /* finally, reduce noise immunity */ if (as->noise_imm_level > 0) { ath5k_ani_set_noise_immunity_level(ah, as->noise_imm_level - 1); return; } } /** * ath5k_hw_ani_get_listen_time() - Calculate time spent listening * * Return an approximation of the time spent "listening" in milliseconds (ms) * since the last call of this function by deducting the cycles spent * transmitting and receiving from the total cycle count. * Save profile count values for debugging/statistics and because we might want * to use them later. * * We assume no one else clears these registers! */ static int ath5k_hw_ani_get_listen_time(struct ath5k_hw *ah, struct ath5k_ani_state *as) { int listen; /* freeze */ ath5k_hw_reg_write(ah, AR5K_MIBC_FMC, AR5K_MIBC); /* read */ as->pfc_cycles = ath5k_hw_reg_read(ah, AR5K_PROFCNT_CYCLE); as->pfc_busy = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RXCLR); as->pfc_tx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_TX); as->pfc_rx = ath5k_hw_reg_read(ah, AR5K_PROFCNT_RX); /* clear */ ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_TX); ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RX); ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_RXCLR); ath5k_hw_reg_write(ah, 0, AR5K_PROFCNT_CYCLE); /* un-freeze */ ath5k_hw_reg_write(ah, 0, AR5K_MIBC); /* TODO: where does 44000 come from? (11g clock rate?) */ listen = (as->pfc_cycles - as->pfc_rx - as->pfc_tx) / 44000; if (as->pfc_cycles == 0 || listen < 0) return 0; return listen; } /** * ath5k_ani_save_and_clear_phy_errors() - Clear and save PHY error counters * * Clear the PHY error counters as soon as possible, since this might be called * from a MIB interrupt and we want to make sure we don't get interrupted again. * Add the count of CCK and OFDM errors to our internal state, so it can be used * by the algorithm later. * * Will be called from interrupt and tasklet context. * Returns 0 if both counters are zero. */ static int ath5k_ani_save_and_clear_phy_errors(struct ath5k_hw *ah, struct ath5k_ani_state *as) { unsigned int ofdm_err, cck_err; if (!ah->ah_capabilities.cap_has_phyerr_counters) return 0; ofdm_err = ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT1); cck_err = ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT2); /* reset counters first, we might be in a hurry (interrupt) */ ath5k_hw_reg_write(ah, ATH5K_PHYERR_CNT_MAX - ATH5K_ANI_OFDM_TRIG_HIGH, AR5K_PHYERR_CNT1); ath5k_hw_reg_write(ah, ATH5K_PHYERR_CNT_MAX - ATH5K_ANI_CCK_TRIG_HIGH, AR5K_PHYERR_CNT2); ofdm_err = ATH5K_ANI_OFDM_TRIG_HIGH - (ATH5K_PHYERR_CNT_MAX - ofdm_err); cck_err = ATH5K_ANI_CCK_TRIG_HIGH - (ATH5K_PHYERR_CNT_MAX - cck_err); /* sometimes both can be zero, especially when there is a superfluous * second interrupt. detect that here and return an error. */ if (ofdm_err <= 0 && cck_err <= 0) return 0; /* avoid negative values should one of the registers overflow */ if (ofdm_err > 0) { as->ofdm_errors += ofdm_err; as->sum_ofdm_errors += ofdm_err; } if (cck_err > 0) { as->cck_errors += cck_err; as->sum_cck_errors += cck_err; } return 1; } /** * ath5k_ani_period_restart() - Restart ANI period * * Just reset counters, so they are clear for the next "ani period". */ static void ath5k_ani_period_restart(struct ath5k_hw *ah, struct ath5k_ani_state *as) { /* keep last values for debugging */ as->last_ofdm_errors = as->ofdm_errors; as->last_cck_errors = as->cck_errors; as->last_listen = as->listen_time; as->ofdm_errors = 0; as->cck_errors = 0; as->listen_time = 0; } /** * ath5k_ani_calibration() - The main ANI calibration function * * We count OFDM and CCK errors relative to the time where we did not send or * receive ("listen" time) and raise or lower immunity accordingly. * This is called regularly (every second) from the calibration timer, but also * when an error threshold has been reached. * * In order to synchronize access from different contexts, this should be * called only indirectly by scheduling the ANI tasklet! */ void ath5k_ani_calibration(struct ath5k_hw *ah) { struct ath5k_ani_state *as = &ah->ah_sc->ani_state; int listen, ofdm_high, ofdm_low, cck_high, cck_low; if (as->ani_mode != ATH5K_ANI_MODE_AUTO) return; /* get listen time since last call and add it to the counter because we * might not have restarted the "ani period" last time */ listen = ath5k_hw_ani_get_listen_time(ah, as); as->listen_time += listen; ath5k_ani_save_and_clear_phy_errors(ah, as); ofdm_high = as->listen_time * ATH5K_ANI_OFDM_TRIG_HIGH / 1000; cck_high = as->listen_time * ATH5K_ANI_CCK_TRIG_HIGH / 1000; ofdm_low = as->listen_time * ATH5K_ANI_OFDM_TRIG_LOW / 1000; cck_low = as->listen_time * ATH5K_ANI_CCK_TRIG_LOW / 1000; ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "listen %d (now %d)", as->listen_time, listen); ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "check high ofdm %d/%d cck %d/%d", as->ofdm_errors, ofdm_high, as->cck_errors, cck_high); if (as->ofdm_errors > ofdm_high || as->cck_errors > cck_high) { /* too many PHY errors - we have to raise immunity */ bool ofdm_flag = as->ofdm_errors > ofdm_high ? true : false; ath5k_ani_raise_immunity(ah, as, ofdm_flag); ath5k_ani_period_restart(ah, as); } else if (as->listen_time > 5 * ATH5K_ANI_LISTEN_PERIOD) { /* If more than 5 (TODO: why 5?) periods have passed and we got * relatively little errors we can try to lower immunity */ ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "check low ofdm %d/%d cck %d/%d", as->ofdm_errors, ofdm_low, as->cck_errors, cck_low); if (as->ofdm_errors <= ofdm_low && as->cck_errors <= cck_low) ath5k_ani_lower_immunity(ah, as); ath5k_ani_period_restart(ah, as); } } /*** INTERRUPT HANDLER ***/ /** * ath5k_ani_mib_intr() - Interrupt handler for ANI MIB counters * * Just read & reset the registers quickly, so they don't generate more * interrupts, save the counters and schedule the tasklet to decide whether * to raise immunity or not. * * We just need to handle PHY error counters, ath5k_hw_update_mib_counters() * should take care of all "normal" MIB interrupts. */ void ath5k_ani_mib_intr(struct ath5k_hw *ah) { struct ath5k_ani_state *as = &ah->ah_sc->ani_state; /* nothing to do here if HW does not have PHY error counters - they * can't be the reason for the MIB interrupt then */ if (!ah->ah_capabilities.cap_has_phyerr_counters) return; /* not in use but clear anyways */ ath5k_hw_reg_write(ah, 0, AR5K_OFDM_FIL_CNT); ath5k_hw_reg_write(ah, 0, AR5K_CCK_FIL_CNT); if (ah->ah_sc->ani_state.ani_mode != ATH5K_ANI_MODE_AUTO) return; /* if one of the errors triggered, we can get a superfluous second * interrupt, even though we have already reset the register. the * function detects that so we can return early */ if (ath5k_ani_save_and_clear_phy_errors(ah, as) == 0) return; if (as->ofdm_errors > ATH5K_ANI_OFDM_TRIG_HIGH || as->cck_errors > ATH5K_ANI_CCK_TRIG_HIGH) tasklet_schedule(&ah->ah_sc->ani_tasklet); } /** * ath5k_ani_phy_error_report() - Used by older HW to report PHY errors * * This is used by hardware without PHY error counters to report PHY errors * on a frame-by-frame basis, instead of the interrupt. */ void ath5k_ani_phy_error_report(struct ath5k_hw *ah, enum ath5k_phy_error_code phyerr) { struct ath5k_ani_state *as = &ah->ah_sc->ani_state; if (phyerr == AR5K_RX_PHY_ERROR_OFDM_TIMING) { as->ofdm_errors++; if (as->ofdm_errors > ATH5K_ANI_OFDM_TRIG_HIGH) tasklet_schedule(&ah->ah_sc->ani_tasklet); } else if (phyerr == AR5K_RX_PHY_ERROR_CCK_TIMING) { as->cck_errors++; if (as->cck_errors > ATH5K_ANI_CCK_TRIG_HIGH) tasklet_schedule(&ah->ah_sc->ani_tasklet); } } /*** INIT ***/ /** * ath5k_enable_phy_err_counters() - Enable PHY error counters * * Enable PHY error counters for OFDM and CCK timing errors. */ static void ath5k_enable_phy_err_counters(struct ath5k_hw *ah) { ath5k_hw_reg_write(ah, ATH5K_PHYERR_CNT_MAX - ATH5K_ANI_OFDM_TRIG_HIGH, AR5K_PHYERR_CNT1); ath5k_hw_reg_write(ah, ATH5K_PHYERR_CNT_MAX - ATH5K_ANI_CCK_TRIG_HIGH, AR5K_PHYERR_CNT2); ath5k_hw_reg_write(ah, AR5K_PHY_ERR_FIL_OFDM, AR5K_PHYERR_CNT1_MASK); ath5k_hw_reg_write(ah, AR5K_PHY_ERR_FIL_CCK, AR5K_PHYERR_CNT2_MASK); /* not in use */ ath5k_hw_reg_write(ah, 0, AR5K_OFDM_FIL_CNT); ath5k_hw_reg_write(ah, 0, AR5K_CCK_FIL_CNT); } /** * ath5k_disable_phy_err_counters() - Disable PHY error counters * * Disable PHY error counters for OFDM and CCK timing errors. */ static void ath5k_disable_phy_err_counters(struct ath5k_hw *ah) { ath5k_hw_reg_write(ah, 0, AR5K_PHYERR_CNT1); ath5k_hw_reg_write(ah, 0, AR5K_PHYERR_CNT2); ath5k_hw_reg_write(ah, 0, AR5K_PHYERR_CNT1_MASK); ath5k_hw_reg_write(ah, 0, AR5K_PHYERR_CNT2_MASK); /* not in use */ ath5k_hw_reg_write(ah, 0, AR5K_OFDM_FIL_CNT); ath5k_hw_reg_write(ah, 0, AR5K_CCK_FIL_CNT); } /** * ath5k_ani_init() - Initialize ANI * @mode: Which mode to use (auto, manual high, manual low, off) * * Initialize ANI according to mode. */ void ath5k_ani_init(struct ath5k_hw *ah, enum ath5k_ani_mode mode) { /* ANI is only possible on 5212 and newer */ if (ah->ah_version < AR5K_AR5212) return; /* clear old state information */ memset(&ah->ah_sc->ani_state, 0, sizeof(ah->ah_sc->ani_state)); /* older hardware has more spur levels than newer */ if (ah->ah_mac_srev < AR5K_SREV_AR2414) ah->ah_sc->ani_state.max_spur_level = 7; else ah->ah_sc->ani_state.max_spur_level = 2; /* initial values for our ani parameters */ if (mode == ATH5K_ANI_MODE_OFF) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "ANI off\n"); } else if (mode == ATH5K_ANI_MODE_MANUAL_LOW) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "ANI manual low -> high sensitivity\n"); ath5k_ani_set_noise_immunity_level(ah, 0); ath5k_ani_set_spur_immunity_level(ah, 0); ath5k_ani_set_firstep_level(ah, 0); ath5k_ani_set_ofdm_weak_signal_detection(ah, true); ath5k_ani_set_cck_weak_signal_detection(ah, true); } else if (mode == ATH5K_ANI_MODE_MANUAL_HIGH) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "ANI manual high -> low sensitivity\n"); ath5k_ani_set_noise_immunity_level(ah, ATH5K_ANI_MAX_NOISE_IMM_LVL); ath5k_ani_set_spur_immunity_level(ah, ah->ah_sc->ani_state.max_spur_level); ath5k_ani_set_firstep_level(ah, ATH5K_ANI_MAX_FIRSTEP_LVL); ath5k_ani_set_ofdm_weak_signal_detection(ah, false); ath5k_ani_set_cck_weak_signal_detection(ah, false); } else if (mode == ATH5K_ANI_MODE_AUTO) { ATH5K_DBG_UNLIMIT(ah->ah_sc, ATH5K_DEBUG_ANI, "ANI auto\n"); ath5k_ani_set_noise_immunity_level(ah, 0); ath5k_ani_set_spur_immunity_level(ah, 0); ath5k_ani_set_firstep_level(ah, 0); ath5k_ani_set_ofdm_weak_signal_detection(ah, true); ath5k_ani_set_cck_weak_signal_detection(ah, false); } /* newer hardware has PHY error counter registers which we can use to * get OFDM and CCK error counts. older hardware has to set rxfilter and * report every single PHY error by calling ath5k_ani_phy_error_report() */ if (mode == ATH5K_ANI_MODE_AUTO) { if (ah->ah_capabilities.cap_has_phyerr_counters) ath5k_enable_phy_err_counters(ah); else ath5k_hw_set_rx_filter(ah, ath5k_hw_get_rx_filter(ah) | AR5K_RX_FILTER_PHYERR); } else { if (ah->ah_capabilities.cap_has_phyerr_counters) ath5k_disable_phy_err_counters(ah); else ath5k_hw_set_rx_filter(ah, ath5k_hw_get_rx_filter(ah) & ~AR5K_RX_FILTER_PHYERR); } ah->ah_sc->ani_state.ani_mode = mode; } /*** DEBUG ***/ #ifdef CONFIG_ATH5K_DEBUG void ath5k_ani_print_counters(struct ath5k_hw *ah) { /* clears too */ printk(KERN_NOTICE "ACK fail\t%d\n", ath5k_hw_reg_read(ah, AR5K_ACK_FAIL)); printk(KERN_NOTICE "RTS fail\t%d\n", ath5k_hw_reg_read(ah, AR5K_RTS_FAIL)); printk(KERN_NOTICE "RTS success\t%d\n", ath5k_hw_reg_read(ah, AR5K_RTS_OK)); printk(KERN_NOTICE "FCS error\t%d\n", ath5k_hw_reg_read(ah, AR5K_FCS_FAIL)); /* no clear */ printk(KERN_NOTICE "tx\t%d\n", ath5k_hw_reg_read(ah, AR5K_PROFCNT_TX)); printk(KERN_NOTICE "rx\t%d\n", ath5k_hw_reg_read(ah, AR5K_PROFCNT_RX)); printk(KERN_NOTICE "busy\t%d\n", ath5k_hw_reg_read(ah, AR5K_PROFCNT_RXCLR)); printk(KERN_NOTICE "cycles\t%d\n", ath5k_hw_reg_read(ah, AR5K_PROFCNT_CYCLE)); printk(KERN_NOTICE "AR5K_PHYERR_CNT1\t%d\n", ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT1)); printk(KERN_NOTICE "AR5K_PHYERR_CNT2\t%d\n", ath5k_hw_reg_read(ah, AR5K_PHYERR_CNT2)); printk(KERN_NOTICE "AR5K_OFDM_FIL_CNT\t%d\n", ath5k_hw_reg_read(ah, AR5K_OFDM_FIL_CNT)); printk(KERN_NOTICE "AR5K_CCK_FIL_CNT\t%d\n", ath5k_hw_reg_read(ah, AR5K_CCK_FIL_CNT)); } #endif