diff options
Diffstat (limited to 'drivers/net/wireless/broadcom/brcm80211/brcmsmac/stf.c')
-rw-r--r-- | drivers/net/wireless/broadcom/brcm80211/brcmsmac/stf.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/stf.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/stf.c new file mode 100644 index 000000000000..dd9162722495 --- /dev/null +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/stf.c @@ -0,0 +1,440 @@ +/* + * 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. + */ + +#include <net/mac80211.h> + +#include "types.h" +#include "d11.h" +#include "rate.h" +#include "phy/phy_hal.h" +#include "channel.h" +#include "main.h" +#include "stf.h" +#include "debug.h" + +#define MIN_SPATIAL_EXPANSION 0 +#define MAX_SPATIAL_EXPANSION 1 + +#define BRCMS_STF_SS_STBC_RX(wlc) (BRCMS_ISNPHY(wlc->band) && \ + NREV_GT(wlc->band->phyrev, 3) && NREV_LE(wlc->band->phyrev, 6)) + +#define NSTS_1 1 +#define NSTS_2 2 +#define NSTS_3 3 +#define NSTS_4 4 + +static const u8 txcore_default[5] = { + (0), /* bitmap of the core enabled */ + (0x01), /* For Nsts = 1, enable core 1 */ + (0x03), /* For Nsts = 2, enable core 1 & 2 */ + (0x07), /* For Nsts = 3, enable core 1, 2 & 3 */ + (0x0f) /* For Nsts = 4, enable all cores */ +}; + +static void brcms_c_stf_stbc_rx_ht_update(struct brcms_c_info *wlc, int val) +{ + /* MIMOPHYs rev3-6 cannot receive STBC with only one rx core active */ + if (BRCMS_STF_SS_STBC_RX(wlc)) { + if ((wlc->stf->rxstreams == 1) && (val != HT_CAP_RX_STBC_NO)) + return; + } + + if (wlc->pub->up) { + brcms_c_update_beacon(wlc); + brcms_c_update_probe_resp(wlc, true); + } +} + +/* + * every WLC_TEMPSENSE_PERIOD seconds temperature check to decide whether to + * turn on/off txchain. + */ +void brcms_c_tempsense_upd(struct brcms_c_info *wlc) +{ + struct brcms_phy_pub *pi = wlc->band->pi; + uint active_chains, txchain; + + /* Check if the chip is too hot. Disable one Tx chain, if it is */ + /* high 4 bits are for Rx chain, low 4 bits are for Tx chain */ + active_chains = wlc_phy_stf_chain_active_get(pi); + txchain = active_chains & 0xf; + + if (wlc->stf->txchain == wlc->stf->hw_txchain) { + if (txchain && (txchain < wlc->stf->hw_txchain)) + /* turn off 1 tx chain */ + brcms_c_stf_txchain_set(wlc, txchain, true); + } else if (wlc->stf->txchain < wlc->stf->hw_txchain) { + if (txchain == wlc->stf->hw_txchain) + /* turn back on txchain */ + brcms_c_stf_txchain_set(wlc, txchain, true); + } +} + +void +brcms_c_stf_ss_algo_channel_get(struct brcms_c_info *wlc, u16 *ss_algo_channel, + u16 chanspec) +{ + struct tx_power power; + u8 siso_mcs_id, cdd_mcs_id, stbc_mcs_id; + + /* Clear previous settings */ + *ss_algo_channel = 0; + + if (!wlc->pub->up) { + *ss_algo_channel = (u16) -1; + return; + } + + wlc_phy_txpower_get_current(wlc->band->pi, &power, + CHSPEC_CHANNEL(chanspec)); + + siso_mcs_id = (CHSPEC_IS40(chanspec)) ? + WL_TX_POWER_MCS40_SISO_FIRST : WL_TX_POWER_MCS20_SISO_FIRST; + cdd_mcs_id = (CHSPEC_IS40(chanspec)) ? + WL_TX_POWER_MCS40_CDD_FIRST : WL_TX_POWER_MCS20_CDD_FIRST; + stbc_mcs_id = (CHSPEC_IS40(chanspec)) ? + WL_TX_POWER_MCS40_STBC_FIRST : WL_TX_POWER_MCS20_STBC_FIRST; + + /* criteria to choose stf mode */ + + /* + * the "+3dbm (12 0.25db units)" is to account for the fact that with + * CDD, tx occurs on both chains + */ + if (power.target[siso_mcs_id] > (power.target[cdd_mcs_id] + 12)) + setbit(ss_algo_channel, PHY_TXC1_MODE_SISO); + else + setbit(ss_algo_channel, PHY_TXC1_MODE_CDD); + + /* + * STBC is ORed into to algo channel as STBC requires per-packet SCB + * capability check so cannot be default mode of operation. One of + * SISO, CDD have to be set + */ + if (power.target[siso_mcs_id] <= (power.target[stbc_mcs_id] + 12)) + setbit(ss_algo_channel, PHY_TXC1_MODE_STBC); +} + +static bool brcms_c_stf_stbc_tx_set(struct brcms_c_info *wlc, s32 int_val) +{ + if ((int_val != AUTO) && (int_val != OFF) && (int_val != ON)) + return false; + + if ((int_val == ON) && (wlc->stf->txstreams == 1)) + return false; + + wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = (s8) int_val; + wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = (s8) int_val; + + return true; +} + +bool brcms_c_stf_stbc_rx_set(struct brcms_c_info *wlc, s32 int_val) +{ + if ((int_val != HT_CAP_RX_STBC_NO) + && (int_val != HT_CAP_RX_STBC_ONE_STREAM)) + return false; + + if (BRCMS_STF_SS_STBC_RX(wlc)) { + if ((int_val != HT_CAP_RX_STBC_NO) + && (wlc->stf->rxstreams == 1)) + return false; + } + + brcms_c_stf_stbc_rx_ht_update(wlc, int_val); + return true; +} + +static int brcms_c_stf_txcore_set(struct brcms_c_info *wlc, u8 Nsts, + u8 core_mask) +{ + brcms_dbg_ht(wlc->hw->d11core, "wl%d: Nsts %d core_mask %x\n", + wlc->pub->unit, Nsts, core_mask); + + if (hweight8(core_mask) > wlc->stf->txstreams) + core_mask = 0; + + if ((hweight8(core_mask) == wlc->stf->txstreams) && + ((core_mask & ~wlc->stf->txchain) + || !(core_mask & wlc->stf->txchain))) + core_mask = wlc->stf->txchain; + + wlc->stf->txcore[Nsts] = core_mask; + /* Nsts = 1..4, txcore index = 1..4 */ + if (Nsts == 1) { + /* Needs to update beacon and ucode generated response + * frames when 1 stream core map changed + */ + wlc->stf->phytxant = core_mask << PHY_TXC_ANT_SHIFT; + brcms_b_txant_set(wlc->hw, wlc->stf->phytxant); + if (wlc->clk) { + brcms_c_suspend_mac_and_wait(wlc); + brcms_c_beacon_phytxctl_txant_upd(wlc, wlc->bcn_rspec); + brcms_c_enable_mac(wlc); + } + } + + return 0; +} + +static int brcms_c_stf_spatial_policy_set(struct brcms_c_info *wlc, int val) +{ + int i; + u8 core_mask = 0; + + brcms_dbg_ht(wlc->hw->d11core, "wl%d: val %x\n", wlc->pub->unit, + val); + + wlc->stf->spatial_policy = (s8) val; + for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) { + core_mask = (val == MAX_SPATIAL_EXPANSION) ? + wlc->stf->txchain : txcore_default[i]; + brcms_c_stf_txcore_set(wlc, (u8) i, core_mask); + } + return 0; +} + +/* + * Centralized txant update function. call it whenever wlc->stf->txant and/or + * wlc->stf->txchain change. + * + * Antennas are controlled by ucode indirectly, which drives PHY or GPIO to + * achieve various tx/rx antenna selection schemes + * + * legacy phy, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 + * means auto(last rx). + * for NREV<3, bit 6 and bit 7 means antenna 0 and 1 respectively, bit6+bit7 + * means last rx and do tx-antenna selection for SISO transmissions + * for NREV=3, bit 6 and bit _8_ means antenna 0 and 1 respectively, bit6+bit7 + * means last rx and do tx-antenna selection for SISO transmissions + * for NREV>=7, bit 6 and bit 7 mean antenna 0 and 1 respectively, nit6+bit7 + * means both cores active +*/ +static void _brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc) +{ + s8 txant; + + txant = (s8) wlc->stf->txant; + if (BRCMS_PHY_11N_CAP(wlc->band)) { + if (txant == ANT_TX_FORCE_0) { + wlc->stf->phytxant = PHY_TXC_ANT_0; + } else if (txant == ANT_TX_FORCE_1) { + wlc->stf->phytxant = PHY_TXC_ANT_1; + + if (BRCMS_ISNPHY(wlc->band) && + NREV_GE(wlc->band->phyrev, 3) + && NREV_LT(wlc->band->phyrev, 7)) + wlc->stf->phytxant = PHY_TXC_ANT_2; + } else { + if (BRCMS_ISLCNPHY(wlc->band) || + BRCMS_ISSSLPNPHY(wlc->band)) + wlc->stf->phytxant = PHY_TXC_LCNPHY_ANT_LAST; + else { + /* catch out of sync wlc->stf->txcore */ + WARN_ON(wlc->stf->txchain <= 0); + wlc->stf->phytxant = + wlc->stf->txchain << PHY_TXC_ANT_SHIFT; + } + } + } else { + if (txant == ANT_TX_FORCE_0) + wlc->stf->phytxant = PHY_TXC_OLD_ANT_0; + else if (txant == ANT_TX_FORCE_1) + wlc->stf->phytxant = PHY_TXC_OLD_ANT_1; + else + wlc->stf->phytxant = PHY_TXC_OLD_ANT_LAST; + } + + brcms_b_txant_set(wlc->hw, wlc->stf->phytxant); +} + +int brcms_c_stf_txchain_set(struct brcms_c_info *wlc, s32 int_val, bool force) +{ + u8 txchain = (u8) int_val; + u8 txstreams; + uint i; + + if (wlc->stf->txchain == txchain) + return 0; + + if ((txchain & ~wlc->stf->hw_txchain) + || !(txchain & wlc->stf->hw_txchain)) + return -EINVAL; + + /* + * if nrate override is configured to be non-SISO STF mode, reject + * reducing txchain to 1 + */ + txstreams = (u8) hweight8(txchain); + if (txstreams > MAX_STREAMS_SUPPORTED) + return -EINVAL; + + wlc->stf->txchain = txchain; + wlc->stf->txstreams = txstreams; + brcms_c_stf_stbc_tx_set(wlc, wlc->band->band_stf_stbc_tx); + brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]); + brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]); + wlc->stf->txant = + (wlc->stf->txstreams == 1) ? ANT_TX_FORCE_0 : ANT_TX_DEF; + _brcms_c_stf_phy_txant_upd(wlc); + + wlc_phy_stf_chain_set(wlc->band->pi, wlc->stf->txchain, + wlc->stf->rxchain); + + for (i = 1; i <= MAX_STREAMS_SUPPORTED; i++) + brcms_c_stf_txcore_set(wlc, (u8) i, txcore_default[i]); + + return 0; +} + +/* + * update wlc->stf->ss_opmode which represents the operational stf_ss mode + * we're using + */ +int brcms_c_stf_ss_update(struct brcms_c_info *wlc, struct brcms_band *band) +{ + int ret_code = 0; + u8 prev_stf_ss; + u8 upd_stf_ss; + + prev_stf_ss = wlc->stf->ss_opmode; + + /* + * NOTE: opmode can only be SISO or CDD as STBC is decided on a + * per-packet basis + */ + if (BRCMS_STBC_CAP_PHY(wlc) && + wlc->stf->ss_algosel_auto + && (wlc->stf->ss_algo_channel != (u16) -1)) { + upd_stf_ss = (wlc->stf->txstreams == 1 || + isset(&wlc->stf->ss_algo_channel, + PHY_TXC1_MODE_SISO)) ? + PHY_TXC1_MODE_SISO : PHY_TXC1_MODE_CDD; + } else { + if (wlc->band != band) + return ret_code; + upd_stf_ss = (wlc->stf->txstreams == 1) ? + PHY_TXC1_MODE_SISO : band->band_stf_ss_mode; + } + if (prev_stf_ss != upd_stf_ss) { + wlc->stf->ss_opmode = upd_stf_ss; + brcms_b_band_stf_ss_set(wlc->hw, upd_stf_ss); + } + + return ret_code; +} + +int brcms_c_stf_attach(struct brcms_c_info *wlc) +{ + wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_SISO; + wlc->bandstate[BAND_5G_INDEX]->band_stf_ss_mode = PHY_TXC1_MODE_CDD; + + if (BRCMS_ISNPHY(wlc->band) && + (wlc_phy_txpower_hw_ctrl_get(wlc->band->pi) != PHY_TPC_HW_ON)) + wlc->bandstate[BAND_2G_INDEX]->band_stf_ss_mode = + PHY_TXC1_MODE_CDD; + brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_2G_INDEX]); + brcms_c_stf_ss_update(wlc, wlc->bandstate[BAND_5G_INDEX]); + + brcms_c_stf_stbc_rx_ht_update(wlc, HT_CAP_RX_STBC_NO); + wlc->bandstate[BAND_2G_INDEX]->band_stf_stbc_tx = OFF; + wlc->bandstate[BAND_5G_INDEX]->band_stf_stbc_tx = OFF; + + if (BRCMS_STBC_CAP_PHY(wlc)) { + wlc->stf->ss_algosel_auto = true; + /* Init the default value */ + wlc->stf->ss_algo_channel = (u16) -1; + } + return 0; +} + +void brcms_c_stf_detach(struct brcms_c_info *wlc) +{ +} + +void brcms_c_stf_phy_txant_upd(struct brcms_c_info *wlc) +{ + _brcms_c_stf_phy_txant_upd(wlc); +} + +void brcms_c_stf_phy_chain_calc(struct brcms_c_info *wlc) +{ + struct ssb_sprom *sprom = &wlc->hw->d11core->bus->sprom; + + /* get available rx/tx chains */ + wlc->stf->hw_txchain = sprom->txchain; + wlc->stf->hw_rxchain = sprom->rxchain; + + /* these parameter are intended to be used for all PHY types */ + if (wlc->stf->hw_txchain == 0 || wlc->stf->hw_txchain == 0xf) { + if (BRCMS_ISNPHY(wlc->band)) + wlc->stf->hw_txchain = TXCHAIN_DEF_NPHY; + else + wlc->stf->hw_txchain = TXCHAIN_DEF; + } + + wlc->stf->txchain = wlc->stf->hw_txchain; + wlc->stf->txstreams = (u8) hweight8(wlc->stf->hw_txchain); + + if (wlc->stf->hw_rxchain == 0 || wlc->stf->hw_rxchain == 0xf) { + if (BRCMS_ISNPHY(wlc->band)) + wlc->stf->hw_rxchain = RXCHAIN_DEF_NPHY; + else + wlc->stf->hw_rxchain = RXCHAIN_DEF; + } + + wlc->stf->rxchain = wlc->stf->hw_rxchain; + wlc->stf->rxstreams = (u8) hweight8(wlc->stf->hw_rxchain); + + /* initialize the txcore table */ + memcpy(wlc->stf->txcore, txcore_default, sizeof(wlc->stf->txcore)); + + /* default spatial_policy */ + wlc->stf->spatial_policy = MIN_SPATIAL_EXPANSION; + brcms_c_stf_spatial_policy_set(wlc, MIN_SPATIAL_EXPANSION); +} + +static u16 _brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, + u32 rspec) +{ + u16 phytxant = wlc->stf->phytxant; + + if (rspec_stf(rspec) != PHY_TXC1_MODE_SISO) + phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT; + else if (wlc->stf->txant == ANT_TX_DEF) + phytxant = wlc->stf->txchain << PHY_TXC_ANT_SHIFT; + phytxant &= PHY_TXC_ANT_MASK; + return phytxant; +} + +u16 brcms_c_stf_phytxchain_sel(struct brcms_c_info *wlc, u32 rspec) +{ + return _brcms_c_stf_phytxchain_sel(wlc, rspec); +} + +u16 brcms_c_stf_d11hdrs_phyctl_txant(struct brcms_c_info *wlc, u32 rspec) +{ + u16 phytxant = wlc->stf->phytxant; + u16 mask = PHY_TXC_ANT_MASK; + + /* for non-siso rates or default setting, use the available chains */ + if (BRCMS_ISNPHY(wlc->band)) { + phytxant = _brcms_c_stf_phytxchain_sel(wlc, rspec); + mask = PHY_TXC_HTANT_MASK; + } + phytxant |= phytxant & mask; + return phytxant; +} |