/*
* 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)
{
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;
}
