1 files changed, 436 insertions, 0 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/stf.c b/drivers/net/wireless/brcm80211/brcmsmac/stf.c
new file mode 100644
index 00000000000..d8f528eb180
--- /dev/null
+++ b/drivers/net/wireless/brcm80211/brcmsmac/stf.c
@@ -0,0 +1,436 @@
+/*
+ * 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"
+
+#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)
+{
+	BCMMSG(wlc->wiphy, "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;
+
+	BCMMSG(wlc->wiphy, "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)
+{
+	/* get available rx/tx chains */
+	wlc->stf->hw_txchain = (u8) getintvar(wlc->hw->sih, BRCMS_SROM_TXCHAIN);
+	wlc->stf->hw_rxchain = (u8) getintvar(wlc->hw->sih, BRCMS_SROM_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;
+}