From b6ba41bb27eb9810d54e2301355ce56fd0e94a1a Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Sat, 9 Jul 2011 11:12:50 +0700 Subject: [PATCH] ath9k_hw: initialize more timing related registers for half/quarter channels Initialize the the clock-to-TSF field of AR_USEC and the SIFS and EIFS time registers based on the clock rate instead of relying on initvals. With those changes, some of the hardcoded AR9287 1.3+ specific overrides can be dropped. Signed-off-by: Felix Fietkau Signed-off-by: John W. Linville --- drivers/net/wireless/ath/ath9k/hw.c | 67 +++++++++++++++++++++++++---- 1 file changed, 59 insertions(+), 8 deletions(-) diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index d4084d89c6f7..279d73ac9085 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -905,6 +905,13 @@ static void ath9k_hw_init_interrupt_masks(struct ath_hw *ah, } } +static void ath9k_hw_set_sifs_time(struct ath_hw *ah, u32 us) +{ + u32 val = ath9k_hw_mac_to_clks(ah, us - 2); + val = min(val, (u32) 0xFFFF); + REG_WRITE(ah, AR_D_GBL_IFS_SIFS, val); +} + static void ath9k_hw_setslottime(struct ath_hw *ah, u32 us) { u32 val = ath9k_hw_mac_to_clks(ah, us); @@ -942,25 +949,60 @@ static bool ath9k_hw_set_global_txtimeout(struct ath_hw *ah, u32 tu) void ath9k_hw_init_global_settings(struct ath_hw *ah) { - struct ieee80211_conf *conf = &ath9k_hw_common(ah)->hw->conf; + struct ath_common *common = ath9k_hw_common(ah); + struct ieee80211_conf *conf = &common->hw->conf; + const struct ath9k_channel *chan = ah->curchan; int acktimeout; int slottime; int sifstime; + int rx_lat = 0, tx_lat = 0, eifs = 0; + u32 reg; ath_dbg(ath9k_hw_common(ah), ATH_DBG_RESET, "ah->misc_mode 0x%x\n", ah->misc_mode); + if (!chan) + return; + if (ah->misc_mode != 0) REG_SET_BIT(ah, AR_PCU_MISC, ah->misc_mode); - if (conf->channel && conf->channel->band == IEEE80211_BAND_5GHZ) - sifstime = 16; - else - sifstime = 10; + rx_lat = 37; + tx_lat = 54; + + if (IS_CHAN_HALF_RATE(chan)) { + eifs = 175; + rx_lat *= 2; + tx_lat *= 2; + if (IS_CHAN_A_FAST_CLOCK(ah, chan)) + tx_lat += 11; + + slottime = 13; + sifstime = 32; + } else if (IS_CHAN_QUARTER_RATE(chan)) { + eifs = 340; + rx_lat *= 4; + tx_lat *= 4; + if (IS_CHAN_A_FAST_CLOCK(ah, chan)) + tx_lat += 22; + + slottime = 21; + sifstime = 64; + } else { + eifs = REG_READ(ah, AR_D_GBL_IFS_EIFS); + reg = REG_READ(ah, AR_USEC); + rx_lat = MS(reg, AR_USEC_RX_LAT); + tx_lat = MS(reg, AR_USEC_TX_LAT); + + slottime = ah->slottime; + if (IS_CHAN_5GHZ(chan)) + sifstime = 16; + else + sifstime = 10; + } /* As defined by IEEE 802.11-2007 17.3.8.6 */ - slottime = ah->slottime + 3 * ah->coverage_class; - acktimeout = slottime + sifstime; + acktimeout = slottime + sifstime + 3 * ah->coverage_class; /* * Workaround for early ACK timeouts, add an offset to match the @@ -972,11 +1014,20 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah) if (conf->channel && conf->channel->band == IEEE80211_BAND_2GHZ) acktimeout += 64 - sifstime - ah->slottime; - ath9k_hw_setslottime(ah, ah->slottime); + ath9k_hw_set_sifs_time(ah, sifstime); + ath9k_hw_setslottime(ah, slottime); ath9k_hw_set_ack_timeout(ah, acktimeout); ath9k_hw_set_cts_timeout(ah, acktimeout); if (ah->globaltxtimeout != (u32) -1) ath9k_hw_set_global_txtimeout(ah, ah->globaltxtimeout); + + REG_WRITE(ah, AR_D_GBL_IFS_EIFS, ath9k_hw_mac_to_clks(ah, eifs)); + REG_RMW(ah, AR_USEC, + (common->clockrate - 1) | + SM(rx_lat, AR_USEC_RX_LAT) | + SM(tx_lat, AR_USEC_TX_LAT), + AR_USEC_TX_LAT | AR_USEC_RX_LAT | AR_USEC_USEC); + } EXPORT_SYMBOL(ath9k_hw_init_global_settings);