2009-03-10 10:37:23

by Nick Kossifidis

Subject: [PATCH 3/3] ath5k: Add tx power calibration support

* Add tx power calibration support
* Add a few tx power limits
* Hardcode default power to 12.5dB
* Disable TPC for now

Signed-off-by: Nick Kossifidis <[email protected]>

---
drivers/net/wireless/ath5k/ath5k.h | 35 +-
drivers/net/wireless/ath5k/attach.c | 2 +
drivers/net/wireless/ath5k/base.c | 13 +-
drivers/net/wireless/ath5k/desc.c | 4 +
drivers/net/wireless/ath5k/phy.c | 1169 +++++++++++++++++++++++++++++++++--
drivers/net/wireless/ath5k/reg.h | 19 +
drivers/net/wireless/ath5k/reset.c | 35 +-
7 files changed, 1180 insertions(+), 97 deletions(-)

diff --git a/drivers/net/wireless/ath5k/ath5k.h b/drivers/net/wireless/ath5k/ath5k.h
index b9af2b8..b4cfa42 100644
--- a/drivers/net/wireless/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath5k/ath5k.h
@@ -204,9 +204,9 @@
#define AR5K_TUNE_CWMAX_11B 1023
#define AR5K_TUNE_CWMAX_XR 7
#define AR5K_TUNE_NOISE_FLOOR -72
-#define AR5K_TUNE_MAX_TXPOWER 60
-#define AR5K_TUNE_DEFAULT_TXPOWER 30
-#define AR5K_TUNE_TPC_TXPOWER true
+#define AR5K_TUNE_MAX_TXPOWER 63
+#define AR5K_TUNE_DEFAULT_TXPOWER 25
+#define AR5K_TUNE_TPC_TXPOWER false
#define AR5K_TUNE_ANT_DIVERSITY true
#define AR5K_TUNE_HWTXTRIES 4

@@ -551,11 +551,11 @@ enum ath5k_pkt_type {
*/
#define AR5K_TXPOWER_OFDM(_r, _v) ( \
((0 & 1) << ((_v) + 6)) | \
- (((ah->ah_txpower.txp_rates[(_r)]) & 0x3f) << (_v)) \
+ (((ah->ah_txpower.txp_rates_power_table[(_r)]) & 0x3f) << (_v)) \
)

#define AR5K_TXPOWER_CCK(_r, _v) ( \
- (ah->ah_txpower.txp_rates[(_r)] & 0x3f) << (_v) \
+ (ah->ah_txpower.txp_rates_power_table[(_r)] & 0x3f) << (_v) \
)

/*
@@ -1085,13 +1085,25 @@ struct ath5k_hw {
struct ath5k_gain ah_gain;
u8 ah_offset[AR5K_MAX_RF_BANKS];

+
struct {
- u16 txp_pcdac[AR5K_EEPROM_POWER_TABLE_SIZE];
- u16 txp_rates[AR5K_MAX_RATES];
- s16 txp_min;
- s16 txp_max;
+ /* Temporary tables used for interpolation */
+ u8 tmpL[AR5K_EEPROM_N_PD_GAINS]
+ [AR5K_EEPROM_POWER_TABLE_SIZE];
+ u8 tmpR[AR5K_EEPROM_N_PD_GAINS]
+ [AR5K_EEPROM_POWER_TABLE_SIZE];
+ u8 txp_pd_table[AR5K_EEPROM_POWER_TABLE_SIZE * 2];
+ u16 txp_rates_power_table[AR5K_MAX_RATES];
+ u8 txp_min_idx;
bool txp_tpc;
+ /* Values in 0.25dB units */
+ s16 txp_min_pwr;
+ s16 txp_max_pwr;
+ s16 txp_offset;
s16 txp_ofdm;
+ /* Values in dB units */
+ s16 txp_cck_ofdm_pwr_delta;
+ s16 txp_cck_ofdm_gainf_delta;
} ah_txpower;

struct {
@@ -1155,6 +1167,7 @@ extern void ath5k_hw_update_mib_counters(struct ath5k_hw *ah, struct ieee80211_l

/* EEPROM access functions */
extern int ath5k_eeprom_init(struct ath5k_hw *ah);
+extern void ath5k_eeprom_detach(struct ath5k_hw *ah);
extern int ath5k_eeprom_read_mac(struct ath5k_hw *ah, u8 *mac);
extern bool ath5k_eeprom_is_hb63(struct ath5k_hw *ah);

@@ -1250,8 +1263,8 @@ extern void ath5k_hw_set_def_antenna(struct ath5k_hw *ah, unsigned int ant);
extern unsigned int ath5k_hw_get_def_antenna(struct ath5k_hw *ah);
extern int ath5k_hw_phy_disable(struct ath5k_hw *ah);
/* TX power setup */
-extern int ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel, unsigned int txpower);
-extern int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, unsigned int power);
+extern int ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel, u8 ee_mode, u8 txpower);
+extern int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, u8 ee_mode, u8 txpower);

/*
* Functions used internaly
diff --git a/drivers/net/wireless/ath5k/attach.c b/drivers/net/wireless/ath5k/attach.c
index 05bc5cb..9d82a75 100644
--- a/drivers/net/wireless/ath5k/attach.c
+++ b/drivers/net/wireless/ath5k/attach.c
@@ -342,6 +342,8 @@ void ath5k_hw_detach(struct ath5k_hw *ah)
if (ah->ah_rf_banks != NULL)
kfree(ah->ah_rf_banks);

+ ath5k_eeprom_detach(ah);
+
/* assume interrupts are down */
kfree(ah);
}
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index f7c424d..d9f483b 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -521,6 +521,7 @@ ath5k_pci_probe(struct pci_dev *pdev,
IEEE80211_HW_NOISE_DBM;

hw->wiphy->interface_modes =
+ BIT(NL80211_IFTYPE_AP)|
BIT(NL80211_IFTYPE_STATION) |
BIT(NL80211_IFTYPE_ADHOC) |
BIT(NL80211_IFTYPE_MESH_POINT);
@@ -1221,6 +1222,9 @@ ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf)

pktlen = skb->len;

+ /* FIXME: If we are in g mode and rate is a CCK rate
+ * subtract ah->ah_txpower.txp_cck_ofdm_pwr_delta
+ * from tx power (value is in dB units already) */
if (info->control.hw_key) {
keyidx = info->control.hw_key->hw_key_idx;
pktlen += info->control.hw_key->icv_len;
@@ -2049,6 +2053,9 @@ ath5k_beacon_setup(struct ath5k_softc *sc, struct ath5k_buf *bf)
antenna = sc->bsent & 4 ? 2 : 1;
}

+ /* FIXME: If we are in g mode and rate is a CCK rate
+ * subtract ah->ah_txpower.txp_cck_ofdm_pwr_delta
+ * from tx power (value is in dB units already) */
ds->ds_data = bf->skbaddr;
ret = ah->ah_setup_tx_desc(ah, ds, skb->len,
ieee80211_get_hdrlen_from_skb(skb),
@@ -2748,12 +2755,6 @@ ath5k_reset(struct ath5k_softc *sc, bool stop, bool change_channel)
goto err;
}

- /*
- * This is needed only to setup initial state
- * but it's best done after a reset.
- */
- ath5k_hw_set_txpower_limit(sc->ah, 0);
-
ret = ath5k_rx_start(sc);
if (ret) {
ATH5K_ERR(sc, "can't start recv logic\n");
diff --git a/drivers/net/wireless/ath5k/desc.c b/drivers/net/wireless/ath5k/desc.c
index b40a928..dc30a2b 100644
--- a/drivers/net/wireless/ath5k/desc.c
+++ b/drivers/net/wireless/ath5k/desc.c
@@ -194,6 +194,10 @@ static int ath5k_hw_setup_4word_tx_desc(struct ath5k_hw *ah,
return -EINVAL;
}

+ tx_power += ah->ah_txpower.txp_offset;
+ if (tx_power > AR5K_TUNE_MAX_TXPOWER)
+ tx_power = AR5K_TUNE_MAX_TXPOWER;
+
/* Clear descriptor */
memset(&desc->ud.ds_tx5212, 0, sizeof(struct ath5k_hw_5212_tx_desc));

diff --git a/drivers/net/wireless/ath5k/phy.c b/drivers/net/wireless/ath5k/phy.c
index 81f5beb..e65135b 100644
--- a/drivers/net/wireless/ath5k/phy.c
+++ b/drivers/net/wireless/ath5k/phy.c
@@ -4,6 +4,7 @@
* Copyright (c) 2004-2007 Reyk Floeter <[email protected]>
* Copyright (c) 2006-2009 Nick Kossifidis <[email protected]>
* Copyright (c) 2007-2008 Jiri Slaby <[email protected]>
+ * Copyright (c) 2008-2009 Felix Fietkau <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@@ -183,7 +184,9 @@ static void ath5k_hw_request_rfgain_probe(struct ath5k_hw *ah)
if (ah->ah_gain.g_state != AR5K_RFGAIN_ACTIVE)
return;

- ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txpower.txp_max,
+ /* Send the packet with 2dB below max power as
+ * patent doc suggest */
+ ath5k_hw_reg_write(ah, AR5K_REG_SM(ah->ah_txpower.txp_max_pwr - 4,
AR5K_PHY_PAPD_PROBE_TXPOWER) |
AR5K_PHY_PAPD_PROBE_TX_NEXT, AR5K_PHY_PAPD_PROBE);

@@ -1433,93 +1436,1119 @@ unsigned int ath5k_hw_get_def_antenna(struct ath5k_hw *ah)
return false; /*XXX: What do we return for 5210 ?*/
}

+
+/****************\
+* TX power setup *
+\****************/
+
+/*
+ * Helper functions
+ */
+
+/*
+ * Do linear interpolation between two given (x, y) points
+ */
+static s16
+ath5k_get_interpolated_value(s16 target, s16 x_left, s16 x_right,
+ s16 y_left, s16 y_right)
+{
+ s16 ratio, result;
+
+ /* Avoid divide by zero and skip interpolation
+ * if we have the same point */
+ if ((x_left == x_right) || (y_left == y_right))
+ return y_left;
+
+ /*
+ * Since we use ints and not fps, we need to scale up in
+ * order to get a sane ratio value (or else we 'll eg. get
+ * always 1 instead of 1.25, 1.75 etc). We scale up by 100
+ * to have some accuracy both for 0.5 and 0.25 steps.
+ */
+ ratio = ((100 * y_right - 100 * y_left)/(x_right - x_left));
+
+ /* Now scale down to be in range */
+ result = y_left + (ratio * (target - x_left) / 100);
+
+ return result;
+}
+
+/*
+ * Find vertical boundary (min pwr) for the linear PCDAC curve.
+ *
+ * Since we have the top of the curve and we draw the line below
+ * until we reach 1 (1 pcdac step) we need to know which point
+ * (x value) that is so that we don't go below y axis and have negative
+ * pcdac values when creating the curve, or fill the table with zeroes.
+ */
+static s16
+ath5k_get_linear_pcdac_min(const u8 *stepL, const u8 *stepR,
+ const s16 *pwrL, const s16 *pwrR)
+{
+ s8 tmp;
+ s16 min_pwrL, min_pwrR;
+ s16 pwr_i = pwrL[0];
+
+ do {
+ pwr_i--;
+ tmp = (s8) ath5k_get_interpolated_value(pwr_i,
+ pwrL[0], pwrL[1],
+ stepL[0], stepL[1]);
+
+ } while (tmp > 1);
+
+ min_pwrL = pwr_i;
+
+ pwr_i = pwrR[0];
+ do {
+ pwr_i--;
+ tmp = (s8) ath5k_get_interpolated_value(pwr_i,
+ pwrR[0], pwrR[1],
+ stepR[0], stepR[1]);
+
+ } while (tmp > 1);
+
+ min_pwrR = pwr_i;
+
+ /* Keep the right boundary so that it works for both curves */
+ return max(min_pwrL, min_pwrR);
+}
+
+/*
+ * Interpolate (pwr,vpd) points to create a Power to PDADC or a
+ * Power to PCDAC curve.
+ *
+ * Each curve has power on x axis (in 0.5dB units) and PCDAC/PDADC
+ * steps (offsets) on y axis. Power can be up to 32dB and it can be
+ * negative on PDADC curves. Max step for PCDAC table is 64 and for
+ * PDADC is 128.
+ *
+ * We write y values (PCDAC/PDADC steps) on hw.
+ */
+static void
+ath5k_create_power_curve(s16 pmin, s16 pmax,
+ const s16 *pwr, const u8 *vpd,
+ u8 num_points,
+ u8 *vpd_table, u8 type)
+{
+ u8 idx[2] = { 0, 1 };
+ s16 pwr_i = 2*pmin;
+ int i;
+
+ if (num_points < 2)
+ return;
+
+ /* We want the whole line, so adjust boundaries
+ * to cover the entire power range. Note that
+ * power values are already 0.25dB so no need
+ * to multiply pwr_i by 2 */
+ if (type == AR5K_PWRTABLE_LINEAR_PCDAC) {
+ pwr_i = pmin;
+ pmin = 0;
+ pmax = 63;
+ }
+
+ /* Find surrounding turning points (TPs)
+ * and interpolate between them */
+ for (i = 0; (i <= (u16) (pmax - pmin)) &&
+ (i < AR5K_EEPROM_POWER_TABLE_SIZE); i++) {
+
+ /* We passed the right TP, move to the next set of TPs
+ * if we pass the last TP, extrapolate above using the last
+ * two TPs for ratio */
+ if ((pwr_i > pwr[idx[1]]) && (idx[1] < num_points - 1)) {
+ idx[0]++;
+ idx[1]++;
+ }
+
+ vpd_table[i] = (u8) ath5k_get_interpolated_value(pwr_i,
+ pwr[idx[0]], pwr[idx[1]],
+ vpd[idx[0]], vpd[idx[1]]);
+
+ /* Increase by 0.5dB
+ * (0.25 dB units) */
+ pwr_i += 2;
+ }
+}
+
+/*
+ * Get the surrounding per-channel power calibration piers
+ * for a given frequency so that we can interpolate between
+ * them and come up with an apropriate dataset for our current
+ * channel.
+ */
+static void
+ath5k_get_chan_pcal_surrounding_piers(struct ath5k_hw *ah,
+ struct ieee80211_channel *channel,
+ struct ath5k_chan_pcal_info **pcinfo_l,
+ struct ath5k_chan_pcal_info **pcinfo_r)
+{
+ struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
+ struct ath5k_chan_pcal_info *pcinfo;
+ u8 idx_l, idx_r;
+ u8 mode, max, i;
+ u32 target = channel->center_freq;
+
+ idx_l = 0;
+ idx_r = 0;
+
+ if (!(channel->hw_value & CHANNEL_OFDM)) {
+ pcinfo = ee->ee_pwr_cal_b;
+ mode = AR5K_EEPROM_MODE_11B;
+ } else if (channel->hw_value & CHANNEL_2GHZ) {
+ pcinfo = ee->ee_pwr_cal_g;
+ mode = AR5K_EEPROM_MODE_11G;
+ } else {
+ pcinfo = ee->ee_pwr_cal_a;
+ mode = AR5K_EEPROM_MODE_11A;
+ }
+ max = ee->ee_n_piers[mode] - 1;
+
+ /* Frequency is below our calibrated
+ * range. Use the lowest power curve
+ * we have */
+ if (target < pcinfo[0].freq) {
+ idx_l = idx_r = 0;
+ goto done;
+ }
+
+ /* Frequency is above our calibrated
+ * range. Use the highest power curve
+ * we have */
+ if (target > pcinfo[max].freq) {
+ idx_l = idx_r = max;
+ goto done;
+ }
+
+ /* Frequency is inside our calibrated
+ * channel range. Pick the surrounding
+ * calibration piers so that we can
+ * interpolate */
+ for (i = 0; i <= max; i++) {
+
+ /* Frequency matches one of our calibration
+ * piers, no need to interpolate, just use
+ * that calibration pier */
+ if (pcinfo[i].freq == target) {
+ idx_l = idx_r = i;
+ goto done;
+ }
+
+ /* We found a calibration pier that's above
+ * frequency, use this pier and the previous
+ * one to interpolate */
+ if (target < pcinfo[i].freq) {
+ idx_r = i;
+ idx_l = idx_r - 1;
+ goto done;
+ }
+ }
+
+done:
+ *pcinfo_l = &pcinfo[idx_l];
+ *pcinfo_r = &pcinfo[idx_r];
+
+ return;
+}
+
+/*
+ * Get the max edge power for this channel if
+ * we have such data from EEPROM's Conformance Test
+ * Limits (CTL), and limit max power if needed.
+ *
+ * FIXME: Only works for world regulatory domains
+ */
+static void
+ath5k_get_max_ctl_power(struct ath5k_hw *ah,
+ struct ieee80211_channel *channel)
+{
+ struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
+ struct ath5k_edge_power *rep = ee->ee_ctl_pwr;
+ u8 *ctl_val = ee->ee_ctl;
+ s16 max_chan_pwr = ah->ah_txpower.txp_max_pwr / 4;
+ s16 edge_pwr = 0;
+ u8 rep_idx;
+ u8 i, ctl_mode;
+ u8 ctl_idx = 0xFF;
+ u32 target = channel->center_freq;
+
+ /* Find out a CTL for our mode that's not mapped
+ * on a specific reg domain.
+ *
+ * TODO: Map our current reg domain to one of the 3 available
+ * reg domain ids so that we can support more CTLs. */
+ switch (channel->hw_value & CHANNEL_MODES) {
+ case CHANNEL_A:
+ ctl_mode = AR5K_CTL_11A | AR5K_CTL_NO_REGDOMAIN;
+ break;
+ case CHANNEL_G:
+ ctl_mode = AR5K_CTL_11G | AR5K_CTL_NO_REGDOMAIN;
+ break;
+ case CHANNEL_B:
+ ctl_mode = AR5K_CTL_11B | AR5K_CTL_NO_REGDOMAIN;
+ break;
+ case CHANNEL_T:
+ ctl_mode = AR5K_CTL_TURBO | AR5K_CTL_NO_REGDOMAIN;
+ break;
+ case CHANNEL_TG:
+ ctl_mode = AR5K_CTL_TURBOG | AR5K_CTL_NO_REGDOMAIN;
+ break;
+ case CHANNEL_XR:
+ /* Fall through */
+ default:
+ return;
+ }
+
+ for (i = 0; i < ee->ee_ctls; i++) {
+ if (ctl_val[i] == ctl_mode) {
+ ctl_idx = i;
+ break;
+ }
+ }
+
+ /* If we have a CTL dataset available grab it and find the
+ * edge power for our frequency */
+ if (ctl_idx == 0xFF)
+ return;
+
+ /* Edge powers are sorted by frequency from lower
+ * to higher. Each CTL corresponds to 8 edge power
+ * measurements. */
+ rep_idx = ctl_idx * AR5K_EEPROM_N_EDGES;
+
+ /* Don't do boundaries check because we
+ * might have more that one bands defined
+ * for this mode */
+
+ /* Get the edge power that's closer to our
+ * frequency */
+ for (i = 0; i < AR5K_EEPROM_N_EDGES; i++) {
+ rep_idx += i;
+ if (target <= rep[rep_idx].freq)
+ edge_pwr = (s16) rep[rep_idx].edge;
+ }
+
+ if (edge_pwr)
+ ah->ah_txpower.txp_max_pwr = 4*min(edge_pwr, max_chan_pwr);
+}
+
+
/*
- * TX power setup
+ * Power to PCDAC table functions
*/

/*
- * Initialize the tx power table (not fully implemented)
+ * Fill Power to PCDAC table on RF5111
+ *
+ * No further processing is needed for RF5111, the only thing we have to
+ * do is fill the values below and above calibration range since eeprom data
+ * may not cover the entire PCDAC table.
+ */
+static void
+ath5k_fill_pwr_to_pcdac_table(struct ath5k_hw *ah, s16* table_min,
+ s16 *table_max)
+{
+ u8 *pcdac_out = ah->ah_txpower.txp_pd_table;
+ u8 *pcdac_tmp = ah->ah_txpower.tmpL[0];
+ u8 pcdac_0, pcdac_n, pcdac_i, pwr_idx, i;
+ s16 min_pwr, max_pwr;
+
+ /* Get table boundaries */
+ min_pwr = table_min[0];
+ pcdac_0 = pcdac_tmp[0];
+
+ max_pwr = table_max[0];
+ pcdac_n = pcdac_tmp[table_max[0] - table_min[0]];
+
+ /* Extrapolate below minimum using pcdac_0 */
+ pcdac_i = 0;
+ for (i = 0; i < min_pwr; i++)
+ pcdac_out[pcdac_i++] = pcdac_0;
+
+ /* Copy values from pcdac_tmp */
+ pwr_idx = min_pwr;
+ for (i = 0 ; pwr_idx <= max_pwr &&
+ pcdac_i < AR5K_EEPROM_POWER_TABLE_SIZE; i++) {
+ pcdac_out[pcdac_i++] = pcdac_tmp[i];
+ pwr_idx++;
+ }
+
+ /* Extrapolate above maximum */
+ while (pcdac_i < AR5K_EEPROM_POWER_TABLE_SIZE)
+ pcdac_out[pcdac_i++] = pcdac_n;
+
+}
+
+/*
+ * Combine available XPD Curves and fill Linear Power to PCDAC table
+ * on RF5112
+ *
+ * RFX112 can have up to 2 curves (one for low txpower range and one for
+ * higher txpower range). We need to put them both on pcdac_out and place
+ * them in the correct location. In case we only have one curve available
+ * just fit it on pcdac_out (it's supposed to cover the entire range of
+ * available pwr levels since it's always the higher power curve). Extrapolate
+ * below and above final table if needed.
*/
-static void ath5k_txpower_table(struct ath5k_hw *ah,
- struct ieee80211_channel *channel, s16 max_power)
+static void
+ath5k_combine_linear_pcdac_curves(struct ath5k_hw *ah, s16* table_min,
+ s16 *table_max, u8 pdcurves)
{
- unsigned int i, min, max, n;
- u16 txpower, *rates;
-
- rates = ah->ah_txpower.txp_rates;
-
- txpower = AR5K_TUNE_DEFAULT_TXPOWER * 2;
- if (max_power > txpower)
- txpower = max_power > AR5K_TUNE_MAX_TXPOWER ?
- AR5K_TUNE_MAX_TXPOWER : max_power;
-
- for (i = 0; i < AR5K_MAX_RATES; i++)
- rates[i] = txpower;
-
- /* XXX setup target powers by rate */
-
- ah->ah_txpower.txp_min = rates[7];
- ah->ah_txpower.txp_max = rates[0];
- ah->ah_txpower.txp_ofdm = rates[0];
-
- /* Calculate the power table */
- n = ARRAY_SIZE(ah->ah_txpower.txp_pcdac);
- min = AR5K_EEPROM_PCDAC_START;
- max = AR5K_EEPROM_PCDAC_STOP;
- for (i = 0; i < n; i += AR5K_EEPROM_PCDAC_STEP)
- ah->ah_txpower.txp_pcdac[i] =
-#ifdef notyet
- min + ((i * (max - min)) / n);
-#else
- min;
+ u8 *pcdac_out = ah->ah_txpower.txp_pd_table;
+ u8 *pcdac_low_pwr;
+ u8 *pcdac_high_pwr;
+ u8 *pcdac_tmp;
+ u8 pwr;
+ s16 max_pwr_idx;
+ s16 min_pwr_idx;
+ s16 mid_pwr_idx = 0;
+ /* Edge flag turs on the 7nth bit on the PCDAC
+ * to delcare the higher power curve (force values
+ * to be greater than 64). If we only have one curve
+ * we don't need to set this, if we have 2 curves and
+ * fill the table backwards this can also be used to
+ * switch from higher power curve to lower power curve */
+ u8 edge_flag;
+ int i;
+
+ /* When we have only one curve available
+ * that's the higher power curve. If we have
+ * two curves the first is the high power curve
+ * and the next is the low power curve. */
+ if (pdcurves > 1) {
+ pcdac_low_pwr = ah->ah_txpower.tmpL[1];
+ pcdac_high_pwr = ah->ah_txpower.tmpL[0];
+ mid_pwr_idx = table_max[1] - table_min[1] - 1;
+ max_pwr_idx = (table_max[0] - table_min[0]) / 2;
+
+ /* If table size goes beyond 31.5dB, keep the
+ * upper 31.5dB range when setting tx power.
+ * Note: 126 = 31.5 dB in quarter dB steps */
+ if (table_max[0] - table_min[1] > 126)
+ min_pwr_idx = table_max[0] - 126;
+ else
+ min_pwr_idx = table_min[1];
+
+ /* Since we fill table backwards
+ * start from high power curve */
+ pcdac_tmp = pcdac_high_pwr;
+
+ edge_flag = 0x40;
+#if 0
+ /* If both min and max power limits are in lower
+ * power curve's range, only use the low power curve.
+ * TODO: min/max levels are related to target
+ * power values requested from driver/user
+ * XXX: Is this really needed ? */
+ if (min_pwr < table_max[1] &&
+ max_pwr < table_max[1]) {
+ edge_flag = 0;
+ pcdac_tmp = pcdac_low_pwr;
+ max_pwr_idx = (table_max[1] - table_min[1])/2;
+ }
#endif
+ } else {
+ pcdac_low_pwr = ah->ah_txpower.tmpL[1]; /* Zeroed */
+ pcdac_high_pwr = ah->ah_txpower.tmpL[0];
+ min_pwr_idx = table_min[0];
+ max_pwr_idx = (table_max[0] - table_min[0]) / 2;
+ pcdac_tmp = pcdac_high_pwr;
+ edge_flag = 0;
+ }
+
+ /* This is used when setting tx power*/
+ ah->ah_txpower.txp_min_idx = min_pwr_idx/2;
+
+ /* Fill Power to PCDAC table backwards */
+ pwr = max_pwr_idx;
+ for (i = 63; i >= 0; i--) {
+ /* Entering lower power range, reset
+ * edge flag and set pcdac_tmp to lower
+ * power curve.*/
+ if (edge_flag == 0x40 &&
+ (2*pwr <= (table_max[1] - table_min[0]) || pwr == 0)) {
+ edge_flag = 0x00;
+ pcdac_tmp = pcdac_low_pwr;
+ pwr = mid_pwr_idx/2;
+ }
+
+ /* Don't go below 1, extrapolate below if we have
+ * already swithced to the lower power curve -or
+ * we only have one curve and edge_flag is zero
+ * anyway */
+ if (pcdac_tmp[pwr] < 1 && (edge_flag == 0x00)) {
+ while (i >= 0) {
+ pcdac_out[i] = pcdac_out[i + 1];
+ i--;
+ }
+ break;
+ }
+
+ pcdac_out[i] = pcdac_tmp[pwr] | edge_flag;
+
+ /* Extrapolate above if pcdac is greater than
+ * 126 -this can happen because we OR pcdac_out
+ * value with edge_flag on high power curve */
+ if (pcdac_out[i] > 126)
+ pcdac_out[i] = 126;
+
+ /* Decrease by a 0.5dB step */
+ pwr--;
+ }
+}
+
+/* Write PCDAC values on hw */
+static void
+ath5k_setup_pcdac_table(struct ath5k_hw *ah)
+{
+ u8 *pcdac_out = ah->ah_txpower.txp_pd_table;
+ int i;
+
+ /*
+ * Write TX power values
+ */
+ for (i = 0; i < (AR5K_EEPROM_POWER_TABLE_SIZE / 2); i++) {
+ ath5k_hw_reg_write(ah,
+ (((pcdac_out[2*i + 0] << 8 | 0xff) & 0xffff) << 0) |
+ (((pcdac_out[2*i + 1] << 8 | 0xff) & 0xffff) << 16),
+ AR5K_PHY_PCDAC_TXPOWER(i));
+ }
}

+
/*
- * Set transmition power
+ * Power to PDADC table functions
*/
-int /*O.K. - txpower_table is unimplemented so this doesn't work*/
-ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
- unsigned int txpower)
+
+/*
+ * Set the gain boundaries and create final Power to PDADC table
+ *
+ * We can have up to 4 pd curves, we need to do a simmilar process
+ * as we do for RF5112. This time we don't have an edge_flag but we
+ * set the gain boundaries on a separate register.
+ */
+static void
+ath5k_combine_pwr_to_pdadc_curves(struct ath5k_hw *ah,
+ s16 *pwr_min, s16 *pwr_max, u8 pdcurves)
{
- bool tpc = ah->ah_txpower.txp_tpc;
- unsigned int i;
+ u8 gain_boundaries[AR5K_EEPROM_N_PD_GAINS];
+ u8 *pdadc_out = ah->ah_txpower.txp_pd_table;
+ u8 *pdadc_tmp;
+ s16 pdadc_0;
+ u8 pdadc_i, pdadc_n, pwr_step, pdg, max_idx, table_size;
+ u8 pd_gain_overlap;
+
+ /* Note: Register value is initialized on initvals
+ * there is no feedback from hw.
+ * XXX: What about pd_gain_overlap from EEPROM ? */
+ pd_gain_overlap = (u8) ath5k_hw_reg_read(ah, AR5K_PHY_TPC_RG5) &
+ AR5K_PHY_TPC_RG5_PD_GAIN_OVERLAP;
+
+ /* Create final PDADC table */
+ for (pdg = 0, pdadc_i = 0; pdg < pdcurves; pdg++) {
+ pdadc_tmp = ah->ah_txpower.tmpL[pdg];
+
+ if (pdg == pdcurves - 1)
+ /* 2 dB boundary stretch for last
+ * (higher power) curve */
+ gain_boundaries[pdg] = pwr_max[pdg] + 4;
+ else
+ /* Set gain boundary in the middle
+ * between this curve and the next one */
+ gain_boundaries[pdg] =
+ (pwr_max[pdg] + pwr_min[pdg + 1]) / 2;
+
+ /* Sanity check in case our 2 db stretch got out of
+ * range. */
+ if (gain_boundaries[pdg] > AR5K_TUNE_MAX_TXPOWER)
+ gain_boundaries[pdg] = AR5K_TUNE_MAX_TXPOWER;
+
+ /* For the first curve (lower power)
+ * start from 0 dB */
+ if (pdg == 0)
+ pdadc_0 = 0;
+ else
+ /* For the other curves use the gain overlap */
+ pdadc_0 = (gain_boundaries[pdg - 1] - pwr_min[pdg]) -
+ pd_gain_overlap;

- ATH5K_TRACE(ah->ah_sc);
- if (txpower > AR5K_TUNE_MAX_TXPOWER) {
- ATH5K_ERR(ah->ah_sc, "invalid tx power: %u\n", txpower);
- return -EINVAL;
+ /* Force each power step to be at least 0.5 dB */
+ if ((pdadc_tmp[1] - pdadc_tmp[0]) > 1)
+ pwr_step = pdadc_tmp[1] - pdadc_tmp[0];
+ else
+ pwr_step = 1;
+
+ /* If pdadc_0 is negative, we need to extrapolate
+ * below this pdgain by a number of pwr_steps */
+ while ((pdadc_0 < 0) && (pdadc_i < 128)) {
+ s16 tmp = pdadc_tmp[0] + pdadc_0 * pwr_step;
+ pdadc_out[pdadc_i++] = (tmp < 0) ? 0 : (u8) tmp;
+ pdadc_0++;
+ }
+
+ /* Set last pwr level, using gain boundaries */
+ pdadc_n = gain_boundaries[pdg] + pd_gain_overlap - pwr_min[pdg];
+ /* Limit it to be inside pwr range */
+ table_size = pwr_max[pdg] - pwr_min[pdg];
+ max_idx = (pdadc_n < table_size) ? pdadc_n : table_size;
+
+ /* Fill pdadc_out table */
+ while (pdadc_0 < max_idx)
+ pdadc_out[pdadc_i++] = pdadc_tmp[pdadc_0++];
+
+ /* Need to extrapolate above this pdgain? */
+ if (pdadc_n <= max_idx)
+ continue;
+
+ /* Force each power step to be at least 0.5 dB */
+ if ((pdadc_tmp[table_size - 1] - pdadc_tmp[table_size - 2]) > 1)
+ pwr_step = pdadc_tmp[table_size - 1] -
+ pdadc_tmp[table_size - 2];
+ else
+ pwr_step = 1;
+
+ /* Extrapolate above */
+ while ((pdadc_0 < (s16) pdadc_n) &&
+ (pdadc_i < AR5K_EEPROM_POWER_TABLE_SIZE * 2)) {
+ s16 tmp = pdadc_tmp[table_size - 1] +
+ (pdadc_0 - max_idx) * pwr_step;
+ pdadc_out[pdadc_i++] = (tmp > 127) ? 127 : (u8) tmp;
+ pdadc_0++;
+ }
+ }
+
+ while (pdg < AR5K_EEPROM_N_PD_GAINS) {
+ gain_boundaries[pdg] = gain_boundaries[pdg - 1];
+ pdg++;
}

+ while (pdadc_i < AR5K_EEPROM_POWER_TABLE_SIZE * 2) {
+ pdadc_out[pdadc_i] = pdadc_out[pdadc_i - 1];
+ pdadc_i++;
+ }
+
+ /* Set gain boundaries */
+ ath5k_hw_reg_write(ah,
+ AR5K_REG_SM(pd_gain_overlap,
+ AR5K_PHY_TPC_RG5_PD_GAIN_OVERLAP) |
+ AR5K_REG_SM(gain_boundaries[0],
+ AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_1) |
+ AR5K_REG_SM(gain_boundaries[1],
+ AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_2) |
+ AR5K_REG_SM(gain_boundaries[2],
+ AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_3) |
+ AR5K_REG_SM(gain_boundaries[3],
+ AR5K_PHY_TPC_RG5_PD_GAIN_BOUNDARY_4),
+ AR5K_PHY_TPC_RG5);
+
+ /* Used for setting rate power table */
+ ah->ah_txpower.txp_min_idx = pwr_min[0];
+
+}
+
+/* Write PDADC values on hw */
+static void
+ath5k_setup_pwr_to_pdadc_table(struct ath5k_hw *ah,
+ u8 pdcurves, u8 *pdg_to_idx)
+{
+ u8 *pdadc_out = ah->ah_txpower.txp_pd_table;
+ u32 reg;
+ u8 i;
+
+ /* Select the right pdgain curves */
+
+ /* Clear current settings */
+ reg = ath5k_hw_reg_read(ah, AR5K_PHY_TPC_RG1);
+ reg &= ~(AR5K_PHY_TPC_RG1_PDGAIN_1 |
+ AR5K_PHY_TPC_RG1_PDGAIN_2 |
+ AR5K_PHY_TPC_RG1_PDGAIN_3 |
+ AR5K_PHY_TPC_RG1_NUM_PD_GAIN);
+
/*
- * RF2413 for some reason can't
- * transmit anything if we call
- * this funtion, so we skip it
- * until we fix txpower.
+ * Use pd_gains curve from eeprom
*
- * XXX: Assume same for RF2425
- * to be safe.
+ * This overrides the default setting from initvals
+ * in case some vendors (e.g. Zcomax) don't use the default
+ * curves. If we don't honor their settings we 'll get a
+ * 5dB (1 * gain overlap ?) drop.
*/
- if ((ah->ah_radio == AR5K_RF2413) || (ah->ah_radio == AR5K_RF2425))
- return 0;
+ reg |= AR5K_REG_SM(pdcurves, AR5K_PHY_TPC_RG1_NUM_PD_GAIN);

- /* Reset TX power values */
- memset(&ah->ah_txpower, 0, sizeof(ah->ah_txpower));
- ah->ah_txpower.txp_tpc = tpc;
-
- /* Initialize TX power table */
- ath5k_txpower_table(ah, channel, txpower);
+ switch (pdcurves) {
+ case 3:
+ reg |= AR5K_REG_SM(pdg_to_idx[2], AR5K_PHY_TPC_RG1_PDGAIN_3);
+ /* Fall through */
+ case 2:
+ reg |= AR5K_REG_SM(pdg_to_idx[1], AR5K_PHY_TPC_RG1_PDGAIN_2);
+ /* Fall through */
+ case 1:
+ reg |= AR5K_REG_SM(pdg_to_idx[0], AR5K_PHY_TPC_RG1_PDGAIN_1);
+ break;
+ }
+ ath5k_hw_reg_write(ah, reg, AR5K_PHY_TPC_RG1);

/*
* Write TX power values
*/
for (i = 0; i < (AR5K_EEPROM_POWER_TABLE_SIZE / 2); i++) {
ath5k_hw_reg_write(ah,
- ((((ah->ah_txpower.txp_pcdac[(i << 1) + 1] << 8) | 0xff) & 0xffff) << 16) |
- (((ah->ah_txpower.txp_pcdac[(i << 1) ] << 8) | 0xff) & 0xffff),
- AR5K_PHY_PCDAC_TXPOWER(i));
+ ((pdadc_out[4*i + 0] & 0xff) << 0) |
+ ((pdadc_out[4*i + 1] & 0xff) << 8) |
+ ((pdadc_out[4*i + 2] & 0xff) << 16) |
+ ((pdadc_out[4*i + 3] & 0xff) << 24),
+ AR5K_PHY_PDADC_TXPOWER(i));
+ }
+}
+
+
+/*
+ * Common code for PCDAC/PDADC tables
+ */
+
+/*
+ * This is the main function that uses all of the above
+ * to set PCDAC/PDADC table on hw for the current channel.
+ * This table is used for tx power calibration on the basband,
+ * without it we get weird tx power levels and in some cases
+ * distorted spectral mask
+ */
+static int
+ath5k_setup_channel_powertable(struct ath5k_hw *ah,
+ struct ieee80211_channel *channel,
+ u8 ee_mode, u8 type)
+{
+ struct ath5k_pdgain_info *pdg_L, *pdg_R;
+ struct ath5k_chan_pcal_info *pcinfo_L;
+ struct ath5k_chan_pcal_info *pcinfo_R;
+ struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
+ u8 *pdg_curve_to_idx = ee->ee_pdc_to_idx[ee_mode];
+ s16 table_min[AR5K_EEPROM_N_PD_GAINS];
+ s16 table_max[AR5K_EEPROM_N_PD_GAINS];
+ u8 *tmpL;
+ u8 *tmpR;
+ u32 target = channel->center_freq;
+ int pdg, i;
+
+ /* Get surounding freq piers for this channel */
+ ath5k_get_chan_pcal_surrounding_piers(ah, channel,
+ &pcinfo_L,
+ &pcinfo_R);
+
+ /* Loop over pd gain curves on
+ * surounding freq piers by index */
+ for (pdg = 0; pdg < ee->ee_pd_gains[ee_mode]; pdg++) {
+
+ /* Fill curves in reverse order
+ * from lower power (max gain)
+ * to higher power. Use curve -> idx
+ * backmaping we did on eeprom init */
+ u8 idx = pdg_curve_to_idx[pdg];
+
+ /* Grab the needed curves by index */
+ pdg_L = &pcinfo_L->pd_curves[idx];
+ pdg_R = &pcinfo_R->pd_curves[idx];
+
+ /* Initialize the temp tables */
+ tmpL = ah->ah_txpower.tmpL[pdg];
+ tmpR = ah->ah_txpower.tmpR[pdg];
+
+ /* Set curve's x boundaries and create
+ * curves so that they cover the same
+ * range (if we don't do that one table
+ * will have values on some range and the
+ * other one won't have any so interpolation
+ * will fail) */
+ table_min[pdg] = min(pdg_L->pd_pwr[0],
+ pdg_R->pd_pwr[0]) / 2;
+
+ table_max[pdg] = max(pdg_L->pd_pwr[pdg_L->pd_points - 1],
+ pdg_R->pd_pwr[pdg_R->pd_points - 1]) / 2;
+
+ /* Now create the curves on surrounding channels
+ * and interpolate if needed to get the final
+ * curve for this gain on this channel */
+ switch (type) {
+ case AR5K_PWRTABLE_LINEAR_PCDAC:
+ /* Override min/max so that we don't loose
+ * accuracy (don't divide by 2) */
+ table_min[pdg] = min(pdg_L->pd_pwr[0],
+ pdg_R->pd_pwr[0]);
+
+ table_max[pdg] =
+ max(pdg_L->pd_pwr[pdg_L->pd_points - 1],
+ pdg_R->pd_pwr[pdg_R->pd_points - 1]);
+
+ /* Override minimum so that we don't get
+ * out of bounds while extrapolating
+ * below. Don't do this when we have 2
+ * curves and we are on the high power curve
+ * because table_min is ok in this case */
+ if (!(ee->ee_pd_gains[ee_mode] > 1 && pdg == 0)) {
+
+ table_min[pdg] =
+ ath5k_get_linear_pcdac_min(pdg_L->pd_step,
+ pdg_R->pd_step,
+ pdg_L->pd_pwr,
+ pdg_R->pd_pwr);
+
+ /* Don't go too low because we will
+ * miss the upper part of the curve.
+ * Note: 126 = 31.5dB (max power supported)
+ * in 0.25dB units */
+ if (table_max[pdg] - table_min[pdg] > 126)
+ table_min[pdg] = table_max[pdg] - 126;
+ }
+
+ /* Fall through */
+ case AR5K_PWRTABLE_PWR_TO_PCDAC:
+ case AR5K_PWRTABLE_PWR_TO_PDADC:
+
+ ath5k_create_power_curve(table_min[pdg],
+ table_max[pdg],
+ pdg_L->pd_pwr,
+ pdg_L->pd_step,
+ pdg_L->pd_points, tmpL, type);
+
+ /* We are in a calibration
+ * pier, no need to interpolate
+ * between freq piers */
+ if (pcinfo_L == pcinfo_R)
+ continue;
+
+ ath5k_create_power_curve(table_min[pdg],
+ table_max[pdg],
+ pdg_R->pd_pwr,
+ pdg_R->pd_step,
+ pdg_R->pd_points, tmpR, type);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Interpolate between curves
+ * of surounding freq piers to
+ * get the final curve for this
+ * pd gain. Re-use tmpL for interpolation
+ * output */
+ for (i = 0; (i < (u16) (table_max[pdg] - table_min[pdg])) &&
+ (i < AR5K_EEPROM_POWER_TABLE_SIZE); i++) {
+ tmpL[i] = (u8) ath5k_get_interpolated_value(target,
+ (s16) pcinfo_L->freq,
+ (s16) pcinfo_R->freq,
+ (s16) tmpL[i],
+ (s16) tmpR[i]);
+ }
+ }
+
+ /* Now we have a set of curves for this
+ * channel on tmpL (x range is table_max - table_min
+ * and y values are tmpL[pdg][]) sorted in the same
+ * order as EEPROM (because we've used the backmaping).
+ * So for RF5112 it's from higher power to lower power
+ * and for RF2413 it's from lower power to higher power.
+ * For RF5111 we only have one curve. */
+
+ /* Fill min and max power levels for this
+ * channel by interpolating the values on
+ * surounding channels to complete the dataset */
+ ah->ah_txpower.txp_min_pwr = ath5k_get_interpolated_value(target,
+ (s16) pcinfo_L->freq,
+ (s16) pcinfo_R->freq,
+ pcinfo_L->min_pwr, pcinfo_R->min_pwr);
+
+ ah->ah_txpower.txp_max_pwr = ath5k_get_interpolated_value(target,
+ (s16) pcinfo_L->freq,
+ (s16) pcinfo_R->freq,
+ pcinfo_L->max_pwr, pcinfo_R->max_pwr);
+
+ /* We are ready to go, fill PCDAC/PDADC
+ * table and write settings on hardware */
+ switch (type) {
+ case AR5K_PWRTABLE_LINEAR_PCDAC:
+ /* For RF5112 we can have one or two curves
+ * and each curve covers a certain power lvl
+ * range so we need to do some more processing */
+ ath5k_combine_linear_pcdac_curves(ah, table_min, table_max,
+ ee->ee_pd_gains[ee_mode]);
+
+ /* Set txp.offset so that we can
+ * match max power value with max
+ * table index */
+ ah->ah_txpower.txp_offset = 64 - (table_max[0] / 2);
+
+ /* Write settings on hw */
+ ath5k_setup_pcdac_table(ah);
+ break;
+ case AR5K_PWRTABLE_PWR_TO_PCDAC:
+ /* We are done for RF5111 since it has only
+ * one curve, just fit the curve on the table */
+ ath5k_fill_pwr_to_pcdac_table(ah, table_min, table_max);
+
+ /* No rate powertable adjustment for RF5111 */
+ ah->ah_txpower.txp_min_idx = 0;
+ ah->ah_txpower.txp_offset = 0;
+
+ /* Write settings on hw */
+ ath5k_setup_pcdac_table(ah);
+ break;
+ case AR5K_PWRTABLE_PWR_TO_PDADC:
+ /* Set PDADC boundaries and fill
+ * final PDADC table */
+ ath5k_combine_pwr_to_pdadc_curves(ah, table_min, table_max,
+ ee->ee_pd_gains[ee_mode]);
+
+ /* Write settings on hw */
+ ath5k_setup_pwr_to_pdadc_table(ah, pdg, pdg_curve_to_idx);
+
+ /* Set txp.offset, note that table_min
+ * can be negative */
+ ah->ah_txpower.txp_offset = table_min[0];
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+
+/*
+ * Per-rate tx power setting
+ *
+ * This is the code that sets the desired tx power (below
+ * maximum) on hw for each rate (we also have TPC that sets
+ * power per packet). We do that by providing an index on the
+ * PCDAC/PDADC table we set up.
+ */
+
+/*
+ * Get the surrounding per-rate power calibration data
+ * for a given frequency and interpolate between power
+ * values to set max target power supported by hw for
+ * each rate.
+ */
+static void
+ath5k_get_rate_pcal_data(struct ath5k_hw *ah,
+ struct ieee80211_channel *channel,
+ struct ath5k_rate_pcal_info *rates)
+{
+ struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
+ struct ath5k_rate_pcal_info *rpinfo;
+ u8 idx_l, idx_r;
+ u8 mode, max, i;
+ u32 target = channel->center_freq;
+
+ idx_l = 0;
+ idx_r = 0;
+
+ if (!(channel->hw_value & CHANNEL_OFDM)) {
+ rpinfo = ee->ee_rate_tpwr_b;
+ mode = AR5K_EEPROM_MODE_11B;
+ } else if (channel->hw_value & CHANNEL_2GHZ) {
+ rpinfo = ee->ee_rate_tpwr_g;
+ mode = AR5K_EEPROM_MODE_11G;
+ } else {
+ rpinfo = ee->ee_rate_tpwr_a;
+ mode = AR5K_EEPROM_MODE_11A;
}
+ max = ee->ee_rate_target_pwr_num[mode] - 1;

+ /* Get the surrounding calibration
+ * piers - same as above */
+ if (target < rpinfo[0].freq) {
+ idx_l = idx_r = 0;
+ goto done;
+ }
+
+ if (target > rpinfo[max].freq) {
+ idx_l = idx_r = max;
+ goto done;
+ }
+
+ for (i = 0; i <= max; i++) {
+
+ if (rpinfo[i].freq == target) {
+ idx_l = idx_r = i;
+ goto done;
+ }
+
+ if (target < rpinfo[i].freq) {
+ idx_r = i;
+ idx_l = idx_r - 1;
+ goto done;
+ }
+ }
+
+done:
+ /* Now interpolate power value, based on the frequency */
+ rates->freq = target;
+
+ rates->target_power_6to24 =
+ ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
+ rpinfo[idx_r].freq,
+ rpinfo[idx_l].target_power_6to24,
+ rpinfo[idx_r].target_power_6to24);
+
+ rates->target_power_36 =
+ ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
+ rpinfo[idx_r].freq,
+ rpinfo[idx_l].target_power_36,
+ rpinfo[idx_r].target_power_36);
+
+ rates->target_power_48 =
+ ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
+ rpinfo[idx_r].freq,
+ rpinfo[idx_l].target_power_48,
+ rpinfo[idx_r].target_power_48);
+
+ rates->target_power_54 =
+ ath5k_get_interpolated_value(target, rpinfo[idx_l].freq,
+ rpinfo[idx_r].freq,
+ rpinfo[idx_l].target_power_54,
+ rpinfo[idx_r].target_power_54);
+}
+
+/*
+ * Set rate power table
+ *
+ * For now we only limit txpower based on maximum tx power
+ * supported by hw (what's inside rate_info). We need to limit
+ * this even more, based on regulatory domain etc.
+ *
+ * Rate power table contains indices to PCDAC/PDADC table (0.5dB steps)
+ * and is indexed as follows:
+ * rates[0] - rates[7] -> OFDM rates
+ * rates[8] - rates[14] -> CCK rates
+ * rates[15] -> XR rates (they all have the same power)
+ */
+static void
+ath5k_setup_rate_powertable(struct ath5k_hw *ah, u16 max_pwr,
+ struct ath5k_rate_pcal_info *rate_info,
+ u8 ee_mode)
+{
+ unsigned int i;
+ u16 *rates;
+
+ /* max_pwr is power level we got from driver/user in 0.5dB
+ * units, switch to 0.25dB units so we can compare */
+ max_pwr *= 2;
+ max_pwr = min(max_pwr, (u16) ah->ah_txpower.txp_max_pwr) / 2;
+
+ /* apply rate limits */
+ rates = ah->ah_txpower.txp_rates_power_table;
+
+ /* OFDM rates 6 to 24Mb/s */
+ for (i = 0; i < 5; i++)
+ rates[i] = min(max_pwr, rate_info->target_power_6to24);
+
+ /* Rest OFDM rates */
+ rates[5] = min(rates[0], rate_info->target_power_36);
+ rates[6] = min(rates[0], rate_info->target_power_48);
+ rates[7] = min(rates[0], rate_info->target_power_54);
+
+ /* CCK rates */
+ /* 1L */
+ rates[8] = min(rates[0], rate_info->target_power_6to24);
+ /* 2L */
+ rates[9] = min(rates[0], rate_info->target_power_36);
+ /* 2S */
+ rates[10] = min(rates[0], rate_info->target_power_36);
+ /* 5L */
+ rates[11] = min(rates[0], rate_info->target_power_48);
+ /* 5S */
+ rates[12] = min(rates[0], rate_info->target_power_48);
+ /* 11L */
+ rates[13] = min(rates[0], rate_info->target_power_54);
+ /* 11S */
+ rates[14] = min(rates[0], rate_info->target_power_54);
+
+ /* XR rates */
+ rates[15] = min(rates[0], rate_info->target_power_6to24);
+
+ /* CCK rates have different peak to average ratio
+ * so we have to tweak their power so that gainf
+ * correction works ok. For this we use OFDM to
+ * CCK delta from eeprom */
+ if ((ee_mode == AR5K_EEPROM_MODE_11G) &&
+ (ah->ah_phy_revision < AR5K_SREV_PHY_5212A))
+ for (i = 8; i <= 15; i++)
+ rates[i] -= ah->ah_txpower.txp_cck_ofdm_gainf_delta;
+
+ ah->ah_txpower.txp_min_pwr = rates[7];
+ ah->ah_txpower.txp_max_pwr = rates[0];
+ ah->ah_txpower.txp_ofdm = rates[7];
+}
+
+
+/*
+ * Set transmition power
+ */
+int
+ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
+ u8 ee_mode, u8 txpower)
+{
+ struct ath5k_rate_pcal_info rate_info;
+ u8 type;
+ int ret;
+
+ ATH5K_TRACE(ah->ah_sc);
+ if (txpower > AR5K_TUNE_MAX_TXPOWER) {
+ ATH5K_ERR(ah->ah_sc, "invalid tx power: %u\n", txpower);
+ return -EINVAL;
+ }
+ if (txpower == 0)
+ txpower = AR5K_TUNE_DEFAULT_TXPOWER;
+
+ /* Reset TX power values */
+ memset(&ah->ah_txpower, 0, sizeof(ah->ah_txpower));
+ ah->ah_txpower.txp_tpc = AR5K_TUNE_TPC_TXPOWER;
+ ah->ah_txpower.txp_min_pwr = 0;
+ ah->ah_txpower.txp_max_pwr = AR5K_TUNE_MAX_TXPOWER;
+
+ /* Initialize TX power table */
+ switch (ah->ah_radio) {
+ case AR5K_RF5111:
+ type = AR5K_PWRTABLE_PWR_TO_PCDAC;
+ break;
+ case AR5K_RF5112:
+ type = AR5K_PWRTABLE_LINEAR_PCDAC;
+ break;
+ case AR5K_RF2413:
+ case AR5K_RF5413:
+ case AR5K_RF2316:
+ case AR5K_RF2317:
+ case AR5K_RF2425:
+ type = AR5K_PWRTABLE_PWR_TO_PDADC;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* FIXME: Only on channel/mode change */
+ ret = ath5k_setup_channel_powertable(ah, channel, ee_mode, type);
+ if (ret)
+ return ret;
+
+ /* Limit max power if we have a CTL available */
+ ath5k_get_max_ctl_power(ah, channel);
+
+ /* FIXME: Tx power limit for this regdomain
+ * XXX: Mac80211/CRDA will do that anyway ? */
+
+ /* FIXME: Antenna reduction stuff */
+
+ /* FIXME: Limit power on turbo modes */
+
+ /* FIXME: TPC scale reduction */
+
+ /* Get surounding channels for per-rate power table
+ * calibration */
+ ath5k_get_rate_pcal_data(ah, channel, &rate_info);
+
+ /* Setup rate power table */
+ ath5k_setup_rate_powertable(ah, txpower, &rate_info, ee_mode);
+
+ /* Write rate power table on hw */
ath5k_hw_reg_write(ah, AR5K_TXPOWER_OFDM(3, 24) |
AR5K_TXPOWER_OFDM(2, 16) | AR5K_TXPOWER_OFDM(1, 8) |
AR5K_TXPOWER_OFDM(0, 0), AR5K_PHY_TXPOWER_RATE1);
@@ -1536,26 +2565,34 @@ ath5k_hw_txpower(struct ath5k_hw *ah, struct ieee80211_channel *channel,
AR5K_TXPOWER_CCK(13, 16) | AR5K_TXPOWER_CCK(12, 8) |
AR5K_TXPOWER_CCK(11, 0), AR5K_PHY_TXPOWER_RATE4);

- if (ah->ah_txpower.txp_tpc)
+ /* FIXME: TPC support */
+ if (ah->ah_txpower.txp_tpc) {
ath5k_hw_reg_write(ah, AR5K_PHY_TXPOWER_RATE_MAX_TPC_ENABLE |
AR5K_TUNE_MAX_TXPOWER, AR5K_PHY_TXPOWER_RATE_MAX);
- else
+
+ ath5k_hw_reg_write(ah,
+ AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_ACK) |
+ AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_CTS) |
+ AR5K_REG_MS(AR5K_TUNE_MAX_TXPOWER, AR5K_TPC_CHIRP),
+ AR5K_TPC);
+ } else {
ath5k_hw_reg_write(ah, AR5K_PHY_TXPOWER_RATE_MAX |
AR5K_TUNE_MAX_TXPOWER, AR5K_PHY_TXPOWER_RATE_MAX);
+ }

return 0;
}

-int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, unsigned int power)
+int ath5k_hw_set_txpower_limit(struct ath5k_hw *ah, u8 mode, u8 txpower)
{
/*Just a try M.F.*/
struct ieee80211_channel *channel = &ah->ah_current_channel;

ATH5K_TRACE(ah->ah_sc);
ATH5K_DBG(ah->ah_sc, ATH5K_DEBUG_TXPOWER,
- "changing txpower to %d\n", power);
+ "changing txpower to %d\n", txpower);

- return ath5k_hw_txpower(ah, channel, power);
+ return ath5k_hw_txpower(ah, channel, mode, txpower);
}

#undef _ATH5K_PHY
diff --git a/drivers/net/wireless/ath5k/reg.h b/drivers/net/wireless/ath5k/reg.h
index 2dc008e..7070d15 100644
--- a/drivers/net/wireless/ath5k/reg.h
+++ b/drivers/net/wireless/ath5k/reg.h
@@ -1554,6 +1554,19 @@
/*===5212 Specific PCU registers===*/

/*
+ * Transmit power control register
+ */
+#define AR5K_TPC 0x80e8
+#define AR5K_TPC_ACK 0x0000003f /* ack frames */
+#define AR5K_TPC_ACK_S 0
+#define AR5K_TPC_CTS 0x00003f00 /* cts frames */
+#define AR5K_TPC_CTS_S 8
+#define AR5K_TPC_CHIRP 0x003f0000 /* chirp frames */
+#define AR5K_TPC_CHIRP_S 16
+#define AR5K_TPC_DOPPLER 0x0f000000 /* doppler chirp span */
+#define AR5K_TPC_DOPPLER_S 24
+
+/*
* XR (eXtended Range) mode register
*/
#define AR5K_XRMODE 0x80c0 /* Register Address */
@@ -2550,6 +2563,12 @@
#define AR5K_PHY_TPC_RG1 0xa258
#define AR5K_PHY_TPC_RG1_NUM_PD_GAIN 0x0000c000
#define AR5K_PHY_TPC_RG1_NUM_PD_GAIN_S 14
+#define AR5K_PHY_TPC_RG1_PDGAIN_1 0x00030000
+#define AR5K_PHY_TPC_RG1_PDGAIN_1_S 16
+#define AR5K_PHY_TPC_RG1_PDGAIN_2 0x000c0000
+#define AR5K_PHY_TPC_RG1_PDGAIN_2_S 18
+#define AR5K_PHY_TPC_RG1_PDGAIN_3 0x00300000
+#define AR5K_PHY_TPC_RG1_PDGAIN_3_S 20

#define AR5K_PHY_TPC_RG5 0xa26C
#define AR5K_PHY_TPC_RG5_PD_GAIN_OVERLAP 0x0000000F
diff --git a/drivers/net/wireless/ath5k/reset.c b/drivers/net/wireless/ath5k/reset.c
index 1531ccd..a0db31d 100644
--- a/drivers/net/wireless/ath5k/reset.c
+++ b/drivers/net/wireless/ath5k/reset.c
@@ -664,29 +664,35 @@ static void ath5k_hw_commit_eeprom_settings(struct ath5k_hw *ah,
struct ieee80211_channel *channel, u8 *ant, u8 ee_mode)
{
struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
+ s16 cck_ofdm_pwr_delta;

- /* Set CCK to OFDM power delta */
- if (ah->ah_phy_revision >= AR5K_SREV_PHY_5212A) {
- int16_t cck_ofdm_pwr_delta;
-
- /* Adjust power delta for channel 14 */
- if (channel->center_freq == 2484)
- cck_ofdm_pwr_delta =
- ((ee->ee_cck_ofdm_power_delta -
- ee->ee_scaled_cck_delta) * 2) / 10;
- else
- cck_ofdm_pwr_delta =
- (ee->ee_cck_ofdm_power_delta * 2) / 10;
+ /* Adjust power delta for channel 14 */
+ if (channel->center_freq == 2484)
+ cck_ofdm_pwr_delta =
+ ((ee->ee_cck_ofdm_power_delta -
+ ee->ee_scaled_cck_delta) * 2) / 10;
+ else
+ cck_ofdm_pwr_delta =
+ (ee->ee_cck_ofdm_power_delta * 2) / 10;

+ /* Set CCK to OFDM power delta on tx power
+ * adjustment register */
+ if (ah->ah_phy_revision >= AR5K_SREV_PHY_5212A) {
if (channel->hw_value == CHANNEL_G)
ath5k_hw_reg_write(ah,
- AR5K_REG_SM((ee->ee_cck_ofdm_power_delta * -1),
+ AR5K_REG_SM((ee->ee_cck_ofdm_gain_delta * -1),
AR5K_PHY_TX_PWR_ADJ_CCK_GAIN_DELTA) |
AR5K_REG_SM((cck_ofdm_pwr_delta * -1),
AR5K_PHY_TX_PWR_ADJ_CCK_PCDAC_INDEX),
AR5K_PHY_TX_PWR_ADJ);
else
ath5k_hw_reg_write(ah, 0, AR5K_PHY_TX_PWR_ADJ);
+ } else {
+ /* For older revs we scale power on sw during tx power
+ * setup */
+ ah->ah_txpower.txp_cck_ofdm_pwr_delta = cck_ofdm_pwr_delta;
+ ah->ah_txpower.txp_cck_ofdm_gainf_delta =
+ ee->ee_cck_ofdm_gain_delta;
}

/* Set antenna idle switch table */
@@ -994,7 +1000,8 @@ int ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
/*
* Set TX power (FIXME)
*/
- ret = ath5k_hw_txpower(ah, channel, AR5K_TUNE_DEFAULT_TXPOWER);
+ ret = ath5k_hw_txpower(ah, channel, ee_mode,
+ AR5K_TUNE_DEFAULT_TXPOWER);
if (ret)
return ret;

2009-03-10 12:47:49

by Jiri Slaby

Subject: Re: [PATCH 3/3] ath5k: Add tx power calibration support

On 10.3.2009 11:37, Nick Kossifidis wrote:
> * Add tx power calibration support
> * Add a few tx power limits
> * Hardcode default power to 12.5dB
> * Disable TPC for now
...
> diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
> index f7c424d..d9f483b 100644
> --- a/drivers/net/wireless/ath5k/base.c
> +++ b/drivers/net/wireless/ath5k/base.c
> @@ -521,6 +521,7 @@ ath5k_pci_probe(struct pci_dev *pdev,
> IEEE80211_HW_NOISE_DBM;
>
> hw->wiphy->interface_modes =
> + BIT(NL80211_IFTYPE_AP)|
> BIT(NL80211_IFTYPE_STATION) |
> BIT(NL80211_IFTYPE_ADHOC) |
> BIT(NL80211_IFTYPE_MESH_POINT);

Is this a typo or wrongly amended commit :)?