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iwlwifi: HW dependent run time calibration

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This patch does several things:

1) rename CONFIG_IWL4965_SENSITIVITY to IWL4965_RUN_TIME_CALIB which is
   better semantic
2) move all the run time calibration to a new file: iwl-calib.c
3) simplify the sensitivity calibration flow and make it HW dependent
4) make the chain noise calibration flow HW dependent

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Emmanuel Grumbach 2008-04-16 16:34:47 -07:00 committed by John W. Linville
parent a7ca0268b5
commit f0832f137c
9 changed files with 1051 additions and 816 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/net/wireless/iwlwifi/Kconfig
View File

@ -15,6 +15,15 @@ config IWLWIFI_LEDS
bool
default n
config IWLWIFI_RUN_TIME_CALIB
bool
depends on IWLCORE
default n
---help---
This option will enable run time calibration for the iwlwifi driver.
These calibrations are Sensitivity and Chain Noise.
config IWLWIFI_RFKILL
boolean "IWLWIFI RF kill support"
depends on IWLCORE
@ -68,12 +77,14 @@ config IWL4965_SPECTRUM_MEASUREMENT
---help---
This option will enable spectrum measurement for the iwl4965 driver.
config IWL4965_SENSITIVITY
bool "Enable Sensitivity Calibration in iwl4965 driver"
config IWL4965_RUN_TIME_CALIB
bool "Enable run time Calibration for 4965 NIC"
select IWLWIFI_RUN_TIME_CALIB
depends on IWL4965
default y
---help---
This option will enable sensitivity calibration for the iwl4965
driver.
This option will enable run time calibration for the iwl4965 driver.
These calibrations are Sensitivity and Chain Noise. If unsure, say yes
config IWLWIFI_DEBUG
bool "Enable full debugging output in iwl4965 driver"

1
drivers/net/wireless/iwlwifi/Makefile
View File

@ -3,6 +3,7 @@ iwlcore-objs := iwl-core.o iwl-eeprom.o iwl-hcmd.o
iwlcore-$(CONFIG_IWLWIFI_DEBUGFS) += iwl-debugfs.o
iwlcore-$(CONFIG_IWLWIFI_LEDS) += iwl-led.o
iwlcore-$(CONFIG_IWLWIFI_RFKILL) += iwl-rfkill.o
iwlcore-$(CONFIG_IWLWIFI_RUN_TIME_CALIB) += iwl-calib.o
obj-$(CONFIG_IWL3945) += iwl3945.o
iwl3945-objs := iwl3945-base.o iwl-3945.o iwl-3945-rs.o

8
drivers/net/wireless/iwlwifi/iwl-4965-commands.h
View File

@ -2559,7 +2559,7 @@ struct iwl4965_missed_beacon_notif {
*/
/*
* Table entries in SENSITIVITY_CMD (struct iwl4965_sensitivity_cmd)
* Table entries in SENSITIVITY_CMD (struct iwl_sensitivity_cmd)
*/
#define HD_TABLE_SIZE (11) /* number of entries */
#define HD_MIN_ENERGY_CCK_DET_INDEX (0) /* table indexes */
@ -2574,18 +2574,18 @@ struct iwl4965_missed_beacon_notif {
#define HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX (9)
#define HD_OFDM_ENERGY_TH_IN_INDEX (10)
/* Control field in struct iwl4965_sensitivity_cmd */
/* Control field in struct iwl_sensitivity_cmd */
#define SENSITIVITY_CMD_CONTROL_DEFAULT_TABLE __constant_cpu_to_le16(0)
#define SENSITIVITY_CMD_CONTROL_WORK_TABLE __constant_cpu_to_le16(1)
/**
* struct iwl4965_sensitivity_cmd
* struct iwl_sensitivity_cmd
* @control: (1) updates working table, (0) updates default table
* @table: energy threshold values, use HD_* as index into table
*
* Always use "1" in "control" to update uCode's working table and DSP.
*/
struct iwl4965_sensitivity_cmd {
struct iwl_sensitivity_cmd {
__le16 control; /* always use "1" */
__le16 table[HD_TABLE_SIZE]; /* use HD_* as index */
} __attribute__ ((packed));

864
drivers/net/wireless/iwlwifi/iwl-4965.c
View File

@ -43,6 +43,7 @@
#include "iwl-core.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
#include "iwl-calib.h"
/* module parameters */
static struct iwl_mod_params iwl4965_mod_params = {
@ -1032,418 +1033,15 @@ void iwl4965_rf_kill_ct_config(struct iwl_priv *priv)
IWL_DEBUG_INFO("REPLY_CT_KILL_CONFIG_CMD succeeded\n");
}
#ifdef CONFIG_IWL4965_SENSITIVITY
/* "false alarms" are signals that our DSP tries to lock onto,
* but then determines that they are either noise, or transmissions
* from a distant wireless network (also "noise", really) that get
* "stepped on" by stronger transmissions within our own network.
* This algorithm attempts to set a sensitivity level that is high
* enough to receive all of our own network traffic, but not so
* high that our DSP gets too busy trying to lock onto non-network
* activity/noise. */
static int iwl4965_sens_energy_cck(struct iwl_priv *priv,
u32 norm_fa,
u32 rx_enable_time,
struct statistics_general_data *rx_info)
{
u32 max_nrg_cck = 0;
int i = 0;
u8 max_silence_rssi = 0;
u32 silence_ref = 0;
u8 silence_rssi_a = 0;
u8 silence_rssi_b = 0;
u8 silence_rssi_c = 0;
u32 val;
/* "false_alarms" values below are cross-multiplications to assess the
* numbers of false alarms within the measured period of actual Rx
* (Rx is off when we're txing), vs the min/max expected false alarms
* (some should be expected if rx is sensitive enough) in a
* hypothetical listening period of 200 time units (TU), 204.8 msec:
*
* MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
*
* */
u32 false_alarms = norm_fa * 200 * 1024;
u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
struct iwl4965_sensitivity_data *data = NULL;
data = &(priv->sensitivity_data);
data->nrg_auto_corr_silence_diff = 0;
/* Find max silence rssi among all 3 receivers.
* This is background noise, which may include transmissions from other
* networks, measured during silence before our network's beacon */
silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
ALL_BAND_FILTER) >> 8);
silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
ALL_BAND_FILTER) >> 8);
silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
ALL_BAND_FILTER) >> 8);
val = max(silence_rssi_b, silence_rssi_c);
max_silence_rssi = max(silence_rssi_a, (u8) val);
/* Store silence rssi in 20-beacon history table */
data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
data->nrg_silence_idx++;
if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
data->nrg_silence_idx = 0;
/* Find max silence rssi across 20 beacon history */
for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
val = data->nrg_silence_rssi[i];
silence_ref = max(silence_ref, val);
}
IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
silence_rssi_a, silence_rssi_b, silence_rssi_c,
silence_ref);
/* Find max rx energy (min value!) among all 3 receivers,
* measured during beacon frame.
* Save it in 10-beacon history table. */
i = data->nrg_energy_idx;
val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
data->nrg_energy_idx++;
if (data->nrg_energy_idx >= 10)
data->nrg_energy_idx = 0;
/* Find min rx energy (max value) across 10 beacon history.
* This is the minimum signal level that we want to receive well.
* Add backoff (margin so we don't miss slightly lower energy frames).
* This establishes an upper bound (min value) for energy threshold. */
max_nrg_cck = data->nrg_value[0];
for (i = 1; i < 10; i++)
max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
max_nrg_cck += 6;
IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
rx_info->beacon_energy_a, rx_info->beacon_energy_b,
rx_info->beacon_energy_c, max_nrg_cck - 6);
/* Count number of consecutive beacons with fewer-than-desired
* false alarms. */
if (false_alarms < min_false_alarms)
data->num_in_cck_no_fa++;
else
data->num_in_cck_no_fa = 0;
IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
data->num_in_cck_no_fa);
/* If we got too many false alarms this time, reduce sensitivity */
if (false_alarms > max_false_alarms) {
IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
false_alarms, max_false_alarms);
IWL_DEBUG_CALIB("... reducing sensitivity\n");
data->nrg_curr_state = IWL_FA_TOO_MANY;
if (data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK) {
/* Store for "fewer than desired" on later beacon */
data->nrg_silence_ref = silence_ref;
/* increase energy threshold (reduce nrg value)
* to decrease sensitivity */
if (data->nrg_th_cck > (NRG_MAX_CCK + NRG_STEP_CCK))
data->nrg_th_cck = data->nrg_th_cck
- NRG_STEP_CCK;
}
/* increase auto_corr values to decrease sensitivity */
if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
else {
val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
data->auto_corr_cck = min((u32)AUTO_CORR_MAX_CCK, val);
}
val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
data->auto_corr_cck_mrc = min((u32)AUTO_CORR_MAX_CCK_MRC, val);
/* Else if we got fewer than desired, increase sensitivity */
} else if (false_alarms < min_false_alarms) {
data->nrg_curr_state = IWL_FA_TOO_FEW;
/* Compare silence level with silence level for most recent
* healthy number or too many false alarms */
data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
(s32)silence_ref;
IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
false_alarms, min_false_alarms,
data->nrg_auto_corr_silence_diff);
/* Increase value to increase sensitivity, but only if:
* 1a) previous beacon did *not* have *too many* false alarms
* 1b) AND there's a significant difference in Rx levels
* from a previous beacon with too many, or healthy # FAs
* OR 2) We've seen a lot of beacons (100) with too few
* false alarms */
if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
(data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
IWL_DEBUG_CALIB("... increasing sensitivity\n");
/* Increase nrg value to increase sensitivity */
val = data->nrg_th_cck + NRG_STEP_CCK;
data->nrg_th_cck = min((u32)NRG_MIN_CCK, val);
/* Decrease auto_corr values to increase sensitivity */
val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
data->auto_corr_cck = max((u32)AUTO_CORR_MIN_CCK, val);
val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
data->auto_corr_cck_mrc =
max((u32)AUTO_CORR_MIN_CCK_MRC, val);
} else
IWL_DEBUG_CALIB("... but not changing sensitivity\n");
/* Else we got a healthy number of false alarms, keep status quo */
} else {
IWL_DEBUG_CALIB(" FA in safe zone\n");
data->nrg_curr_state = IWL_FA_GOOD_RANGE;
/* Store for use in "fewer than desired" with later beacon */
data->nrg_silence_ref = silence_ref;
/* If previous beacon had too many false alarms,
* give it some extra margin by reducing sensitivity again
* (but don't go below measured energy of desired Rx) */
if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
IWL_DEBUG_CALIB("... increasing margin\n");
data->nrg_th_cck -= NRG_MARGIN;
}
}
/* Make sure the energy threshold does not go above the measured
* energy of the desired Rx signals (reduced by backoff margin),
* or else we might start missing Rx frames.
* Lower value is higher energy, so we use max()!
*/
data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);
data->nrg_prev_state = data->nrg_curr_state;
return 0;
}
static int iwl4965_sens_auto_corr_ofdm(struct iwl_priv *priv,
u32 norm_fa,
u32 rx_enable_time)
{
u32 val;
u32 false_alarms = norm_fa * 200 * 1024;
u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
struct iwl4965_sensitivity_data *data = NULL;
data = &(priv->sensitivity_data);
/* If we got too many false alarms this time, reduce sensitivity */
if (false_alarms > max_false_alarms) {
IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
false_alarms, max_false_alarms);
val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm =
min((u32)AUTO_CORR_MAX_OFDM, val);
val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc =
min((u32)AUTO_CORR_MAX_OFDM_MRC, val);
val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_x1 =
min((u32)AUTO_CORR_MAX_OFDM_X1, val);
val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc_x1 =
min((u32)AUTO_CORR_MAX_OFDM_MRC_X1, val);
}
/* Else if we got fewer than desired, increase sensitivity */
else if (false_alarms < min_false_alarms) {
IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
false_alarms, min_false_alarms);
val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm =
max((u32)AUTO_CORR_MIN_OFDM, val);
val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc =
max((u32)AUTO_CORR_MIN_OFDM_MRC, val);
val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_x1 =
max((u32)AUTO_CORR_MIN_OFDM_X1, val);
val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc_x1 =
max((u32)AUTO_CORR_MIN_OFDM_MRC_X1, val);
}
else
IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
min_false_alarms, false_alarms, max_false_alarms);
return 0;
}
static int iwl4965_sensitivity_callback(struct iwl_priv *priv,
struct iwl_cmd *cmd, struct sk_buff *skb)
{
/* We didn't cache the SKB; let the caller free it */
return 1;
}
/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
static int iwl4965_sensitivity_write(struct iwl_priv *priv, u8 flags)
{
struct iwl4965_sensitivity_cmd cmd ;
struct iwl4965_sensitivity_data *data = NULL;
struct iwl_host_cmd cmd_out = {
.id = SENSITIVITY_CMD,
.len = sizeof(struct iwl4965_sensitivity_cmd),
.meta.flags = flags,
.data = &cmd,
};
int ret;
data = &(priv->sensitivity_data);
memset(&cmd, 0, sizeof(cmd));
cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm);
cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm_x1);
cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
cpu_to_le16((u16)data->auto_corr_cck);
cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
cpu_to_le16((u16)data->auto_corr_cck_mrc);
cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
cpu_to_le16((u16)data->nrg_th_cck);
cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
cpu_to_le16((u16)data->nrg_th_ofdm);
cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
__constant_cpu_to_le16(190);
cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
__constant_cpu_to_le16(390);
cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
__constant_cpu_to_le16(62);
IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
data->nrg_th_ofdm);
IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
data->auto_corr_cck, data->auto_corr_cck_mrc,
data->nrg_th_cck);
/* Update uCode's "work" table, and copy it to DSP */
cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
if (flags & CMD_ASYNC)
cmd_out.meta.u.callback = iwl4965_sensitivity_callback;
/* Don't send command to uCode if nothing has changed */
if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
sizeof(u16)*HD_TABLE_SIZE)) {
IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
return 0;
}
/* Copy table for comparison next time */
memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
sizeof(u16)*HD_TABLE_SIZE);
ret = iwl_send_cmd(priv, &cmd_out);
if (ret)
IWL_ERROR("SENSITIVITY_CMD failed\n");
return ret;
}
void iwl4965_init_sensitivity(struct iwl_priv *priv, u8 flags, u8 force)
{
struct iwl4965_sensitivity_data *data = NULL;
int i;
int ret = 0;
IWL_DEBUG_CALIB("Start iwl4965_init_sensitivity\n");
if (force)
memset(&(priv->sensitivity_tbl[0]), 0,
sizeof(u16)*HD_TABLE_SIZE);
/* Clear driver's sensitivity algo data */
data = &(priv->sensitivity_data);
memset(data, 0, sizeof(struct iwl4965_sensitivity_data));
data->num_in_cck_no_fa = 0;
data->nrg_curr_state = IWL_FA_TOO_MANY;
data->nrg_prev_state = IWL_FA_TOO_MANY;
data->nrg_silence_ref = 0;
data->nrg_silence_idx = 0;
data->nrg_energy_idx = 0;
for (i = 0; i < 10; i++)
data->nrg_value[i] = 0;
for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
data->nrg_silence_rssi[i] = 0;
data->auto_corr_ofdm = 90;
data->auto_corr_ofdm_mrc = 170;
data->auto_corr_ofdm_x1 = 105;
data->auto_corr_ofdm_mrc_x1 = 220;
data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
data->auto_corr_cck_mrc = 200;
data->nrg_th_cck = 100;
data->nrg_th_ofdm = 100;
data->last_bad_plcp_cnt_ofdm = 0;
data->last_fa_cnt_ofdm = 0;
data->last_bad_plcp_cnt_cck = 0;
data->last_fa_cnt_cck = 0;
/* Clear prior Sensitivity command data to force send to uCode */
if (force)
memset(&(priv->sensitivity_tbl[0]), 0,
sizeof(u16)*HD_TABLE_SIZE);
ret |= iwl4965_sensitivity_write(priv, flags);
IWL_DEBUG_CALIB("<<return 0x%X\n", ret);
return;
}
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
/* Reset differential Rx gains in NIC to prepare for chain noise calibration.
* Called after every association, but this runs only once!
* ... once chain noise is calibrated the first time, it's good forever. */
void iwl4965_chain_noise_reset(struct iwl_priv *priv)
static void iwl4965_chain_noise_reset(struct iwl_priv *priv)
{
struct iwl4965_chain_noise_data *data = NULL;
struct iwl_chain_noise_data *data = &(priv->chain_noise_data);
data = &(priv->chain_noise_data);
if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl_is_associated(priv)) {
struct iwl4965_calibration_cmd cmd;
@ -1452,357 +1050,76 @@ void iwl4965_chain_noise_reset(struct iwl_priv *priv)
cmd.diff_gain_a = 0;
cmd.diff_gain_b = 0;
cmd.diff_gain_c = 0;
iwl_send_cmd_pdu_async(priv, REPLY_PHY_CALIBRATION_CMD,
sizeof(cmd), &cmd, NULL);
msleep(4);
if (iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
sizeof(cmd), &cmd))
IWL_ERROR("Could not send REPLY_PHY_CALIBRATION_CMD\n");
data->state = IWL_CHAIN_NOISE_ACCUMULATE;
IWL_DEBUG_CALIB("Run chain_noise_calibrate\n");
}
return;
}
/*
* Accumulate 20 beacons of signal and noise statistics for each of
* 3 receivers/antennas/rx-chains, then figure out:
* 1) Which antennas are connected.
* 2) Differential rx gain settings to balance the 3 receivers.
*/
static void iwl4965_noise_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *stat_resp)
static void iwl4965_gain_computation(struct iwl_priv *priv,
u32 *average_noise,
u16 min_average_noise_antenna_i,
u32 min_average_noise)
{
struct iwl4965_chain_noise_data *data = NULL;
int ret = 0;
int i, ret;
struct iwl_chain_noise_data *data = &priv->chain_noise_data;
u32 chain_noise_a;
u32 chain_noise_b;
u32 chain_noise_c;
u32 chain_sig_a;
u32 chain_sig_b;
u32 chain_sig_c;
u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
u32 max_average_sig;
u16 max_average_sig_antenna_i;
u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
u16 i = 0;
u16 chan_num = INITIALIZATION_VALUE;
u32 band = INITIALIZATION_VALUE;
u32 active_chains = 0;
unsigned long flags;
struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
data->delta_gain_code[min_average_noise_antenna_i] = 0;
data = &(priv->chain_noise_data);
for (i = 0; i < NUM_RX_CHAINS; i++) {
s32 delta_g = 0;
/* Accumulate just the first 20 beacons after the first association,
* then we're done forever. */
if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
if (data->state == IWL_CHAIN_NOISE_ALIVE)
IWL_DEBUG_CALIB("Wait for noise calib reset\n");
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
IWL_DEBUG_CALIB(" << Interference data unavailable\n");
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
band = (priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK) ? 0 : 1;
chan_num = le16_to_cpu(priv->staging_rxon.channel);
/* Make sure we accumulate data for just the associated channel
* (even if scanning). */
if ((chan_num != (le32_to_cpu(stat_resp->flag) >> 16)) ||
((STATISTICS_REPLY_FLG_BAND_24G_MSK ==
(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK)) && band)) {
IWL_DEBUG_CALIB("Stats not from chan=%d, band=%d\n",
chan_num, band);
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* Accumulate beacon statistics values across 20 beacons */
chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
IN_BAND_FILTER;
chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
IN_BAND_FILTER;
chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
IN_BAND_FILTER;
chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
spin_unlock_irqrestore(&priv->lock, flags);
data->beacon_count++;
data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
IWL_DEBUG_CALIB("chan=%d, band=%d, beacon=%d\n", chan_num, band,
data->beacon_count);
IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
chain_sig_a, chain_sig_b, chain_sig_c);
IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
chain_noise_a, chain_noise_b, chain_noise_c);
/* If this is the 20th beacon, determine:
* 1) Disconnected antennas (using signal strengths)
* 2) Differential gain (using silence noise) to balance receivers */
if (data->beacon_count == CAL_NUM_OF_BEACONS) {
/* Analyze signal for disconnected antenna */
average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;
if (average_sig[0] >= average_sig[1]) {
max_average_sig = average_sig[0];
max_average_sig_antenna_i = 0;
active_chains = (1 << max_average_sig_antenna_i);
} else {
max_average_sig = average_sig[1];
max_average_sig_antenna_i = 1;
active_chains = (1 << max_average_sig_antenna_i);
}
if (average_sig[2] >= max_average_sig) {
max_average_sig = average_sig[2];
max_average_sig_antenna_i = 2;
active_chains = (1 << max_average_sig_antenna_i);
}
IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
average_sig[0], average_sig[1], average_sig[2]);
IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
max_average_sig, max_average_sig_antenna_i);
/* Compare signal strengths for all 3 receivers. */
for (i = 0; i < NUM_RX_CHAINS; i++) {
if (i != max_average_sig_antenna_i) {
s32 rssi_delta = (max_average_sig -
average_sig[i]);
/* If signal is very weak, compared with
* strongest, mark it as disconnected. */
if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
data->disconn_array[i] = 1;
else
active_chains |= (1 << i);
IWL_DEBUG_CALIB("i = %d rssiDelta = %d "
"disconn_array[i] = %d\n",
i, rssi_delta, data->disconn_array[i]);
}
}
/*If both chains A & B are disconnected -
* connect B and leave A as is */
if (data->disconn_array[CHAIN_A] &&
data->disconn_array[CHAIN_B]) {
data->disconn_array[CHAIN_B] = 0;
active_chains |= (1 << CHAIN_B);
IWL_DEBUG_CALIB("both A & B chains are disconnected! "
"W/A - declare B as connected\n");
}
IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
active_chains);
/* Save for use within RXON, TX, SCAN commands, etc. */
priv->valid_antenna = active_chains;
/* Analyze noise for rx balance */
average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);
for (i = 0; i < NUM_RX_CHAINS; i++) {
if (!(data->disconn_array[i]) &&
(average_noise[i] <= min_average_noise)) {
/* This means that chain i is active and has
* lower noise values so far: */
min_average_noise = average_noise[i];
min_average_noise_antenna_i = i;
}
}
data->delta_gain_code[min_average_noise_antenna_i] = 0;
IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
average_noise[0], average_noise[1],
average_noise[2]);
IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
min_average_noise, min_average_noise_antenna_i);
for (i = 0; i < NUM_RX_CHAINS; i++) {
s32 delta_g = 0;
if (!(data->disconn_array[i]) &&
(data->delta_gain_code[i] ==
if (!(data->disconn_array[i]) &&
(data->delta_gain_code[i] ==
CHAIN_NOISE_DELTA_GAIN_INIT_VAL)) {
delta_g = average_noise[i] - min_average_noise;
data->delta_gain_code[i] = (u8)((delta_g *
10) / 15);
if (CHAIN_NOISE_MAX_DELTA_GAIN_CODE <
data->delta_gain_code[i])
data->delta_gain_code[i] =
CHAIN_NOISE_MAX_DELTA_GAIN_CODE;
delta_g = average_noise[i] - min_average_noise;
data->delta_gain_code[i] = (u8)((delta_g * 10) / 15);
data->delta_gain_code[i] =
min(data->delta_gain_code[i],
(u8) CHAIN_NOISE_MAX_DELTA_GAIN_CODE);
data->delta_gain_code[i] =
(data->delta_gain_code[i] | (1 << 2));
} else
data->delta_gain_code[i] = 0;
data->delta_gain_code[i] =
(data->delta_gain_code[i] | (1 << 2));
} else {
data->delta_gain_code[i] = 0;
}
IWL_DEBUG_CALIB("delta_gain_codes: a %d b %d c %d\n",
data->delta_gain_code[0],
data->delta_gain_code[1],
data->delta_gain_code[2]);
/* Differential gain gets sent to uCode only once */
if (!data->radio_write) {
struct iwl4965_calibration_cmd cmd;
data->radio_write = 1;
memset(&cmd, 0, sizeof(cmd));
cmd.opCode = PHY_CALIBRATE_DIFF_GAIN_CMD;
cmd.diff_gain_a = data->delta_gain_code[0];
cmd.diff_gain_b = data->delta_gain_code[1];
cmd.diff_gain_c = data->delta_gain_code[2];
ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
sizeof(cmd), &cmd);
if (ret)
IWL_DEBUG_CALIB("fail sending cmd "
"REPLY_PHY_CALIBRATION_CMD \n");
/* TODO we might want recalculate
* rx_chain in rxon cmd */
/* Mark so we run this algo only once! */
data->state = IWL_CHAIN_NOISE_CALIBRATED;
}
data->chain_noise_a = 0;
data->chain_noise_b = 0;
data->chain_noise_c = 0;
data->chain_signal_a = 0;
data->chain_signal_b = 0;
data->chain_signal_c = 0;
data->beacon_count = 0;
}
return;
}
IWL_DEBUG_CALIB("delta_gain_codes: a %d b %d c %d\n",
data->delta_gain_code[0],
data->delta_gain_code[1],
data->delta_gain_code[2]);
static void iwl4965_sensitivity_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *resp)
{
u32 rx_enable_time;
u32 fa_cck;
u32 fa_ofdm;
u32 bad_plcp_cck;
u32 bad_plcp_ofdm;
u32 norm_fa_ofdm;
u32 norm_fa_cck;
struct iwl4965_sensitivity_data *data = NULL;
struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
struct statistics_rx *statistics = &(resp->rx);
unsigned long flags;
struct statistics_general_data statis;
int ret;
/* Differential gain gets sent to uCode only once */
if (!data->radio_write) {
struct iwl4965_calibration_cmd cmd;
data->radio_write = 1;
data = &(priv->sensitivity_data);
memset(&cmd, 0, sizeof(cmd));
cmd.opCode = PHY_CALIBRATE_DIFF_GAIN_CMD;
cmd.diff_gain_a = data->delta_gain_code[0];
cmd.diff_gain_b = data->delta_gain_code[1];
cmd.diff_gain_c = data->delta_gain_code[2];
ret = iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
sizeof(cmd), &cmd);
if (ret)
IWL_DEBUG_CALIB("fail sending cmd "
"REPLY_PHY_CALIBRATION_CMD \n");
if (!iwl_is_associated(priv)) {
IWL_DEBUG_CALIB("<< - not associated\n");
return;
/* TODO we might want recalculate
* rx_chain in rxon cmd */
/* Mark so we run this algo only once! */
data->state = IWL_CHAIN_NOISE_CALIBRATED;
}
spin_lock_irqsave(&priv->lock, flags);
if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
IWL_DEBUG_CALIB("<< invalid data.\n");
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* Extract Statistics: */
rx_enable_time = le32_to_cpu(rx_info->channel_load);
fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
statis.beacon_silence_rssi_a =
le32_to_cpu(statistics->general.beacon_silence_rssi_a);
statis.beacon_silence_rssi_b =
le32_to_cpu(statistics->general.beacon_silence_rssi_b);
statis.beacon_silence_rssi_c =
le32_to_cpu(statistics->general.beacon_silence_rssi_c);
statis.beacon_energy_a =
le32_to_cpu(statistics->general.beacon_energy_a);
statis.beacon_energy_b =
le32_to_cpu(statistics->general.beacon_energy_b);
statis.beacon_energy_c =
le32_to_cpu(statistics->general.beacon_energy_c);
spin_unlock_irqrestore(&priv->lock, flags);
IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);
if (!rx_enable_time) {
IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
return;
}
/* These statistics increase monotonically, and do not reset
* at each beacon. Calculate difference from last value, or just
* use the new statistics value if it has reset or wrapped around. */
if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
data->last_bad_plcp_cnt_cck = bad_plcp_cck;
else {
bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
data->last_bad_plcp_cnt_cck += bad_plcp_cck;
}
if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
else {
bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
}
if (data->last_fa_cnt_ofdm > fa_ofdm)
data->last_fa_cnt_ofdm = fa_ofdm;
else {
fa_ofdm -= data->last_fa_cnt_ofdm;
data->last_fa_cnt_ofdm += fa_ofdm;
}
if (data->last_fa_cnt_cck > fa_cck)
data->last_fa_cnt_cck = fa_cck;
else {
fa_cck -= data->last_fa_cnt_cck;
data->last_fa_cnt_cck += fa_cck;
}
/* Total aborted signal locks */
norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
norm_fa_cck = fa_cck + bad_plcp_cck;
IWL_DEBUG_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,
bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
iwl4965_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
iwl4965_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
ret = iwl4965_sensitivity_write(priv, CMD_ASYNC);
return;
data->chain_noise_a = 0;
data->chain_noise_b = 0;
data->chain_noise_c = 0;
data->chain_signal_a = 0;
data->chain_signal_b = 0;
data->chain_signal_c = 0;
data->beacon_count = 0;
}
static void iwl4965_bg_sensitivity_work(struct work_struct *work)
@ -1819,21 +1136,15 @@ static void iwl4965_bg_sensitivity_work(struct work_struct *work)
}
if (priv->start_calib) {
iwl4965_noise_calibration(priv, &priv->statistics);
iwl_chain_noise_calibration(priv, &priv->statistics);
if (priv->sensitivity_data.state ==
IWL_SENS_CALIB_NEED_REINIT) {
iwl4965_init_sensitivity(priv, CMD_ASYNC, 0);
priv->sensitivity_data.state = IWL_SENS_CALIB_ALLOWED;
} else
iwl4965_sensitivity_calibration(priv,
&priv->statistics);
iwl_sensitivity_calibration(priv, &priv->statistics);
}
mutex_unlock(&priv->mutex);
return;
}
#endif /*CONFIG_IWL4965_SENSITIVITY*/
#endif /*CONFIG_IWL4965_RUN_TIME_CALIB*/
static void iwl4965_bg_txpower_work(struct work_struct *work)
{
@ -1932,15 +1243,15 @@ int iwl4965_alive_notify(struct iwl_priv *priv)
spin_lock_irqsave(&priv->lock, flags);
#ifdef CONFIG_IWL4965_SENSITIVITY
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
memset(&(priv->sensitivity_data), 0,
sizeof(struct iwl4965_sensitivity_data));
sizeof(struct iwl_sensitivity_data));
memset(&(priv->chain_noise_data), 0,
sizeof(struct iwl4965_chain_noise_data));
sizeof(struct iwl_chain_noise_data));
for (i = 0; i < NUM_RX_CHAINS; i++)
priv->chain_noise_data.delta_gain_code[i] =
CHAIN_NOISE_DELTA_GAIN_INIT_VAL;
#endif /* CONFIG_IWL4965_SENSITIVITY*/
#endif /* CONFIG_IWL4965_RUN_TIME_CALIB*/
ret = iwl_grab_nic_access(priv);
if (ret) {
spin_unlock_irqrestore(&priv->lock, flags);
@ -2013,6 +1324,31 @@ int iwl4965_alive_notify(struct iwl_priv *priv)
return ret;
}
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
static struct iwl_sensitivity_ranges iwl4965_sensitivity = {
.min_nrg_cck = 97,
.max_nrg_cck = 0,
.auto_corr_min_ofdm = 85,
.auto_corr_min_ofdm_mrc = 170,
.auto_corr_min_ofdm_x1 = 105,
.auto_corr_min_ofdm_mrc_x1 = 220,
.auto_corr_max_ofdm = 120,
.auto_corr_max_ofdm_mrc = 210,
.auto_corr_max_ofdm_x1 = 140,
.auto_corr_max_ofdm_mrc_x1 = 270,
.auto_corr_min_cck = 125,
.auto_corr_max_cck = 200,
.auto_corr_min_cck_mrc = 200,
.auto_corr_max_cck_mrc = 400,
.nrg_th_cck = 100,
.nrg_th_ofdm = 100,
};
#endif
/**
* iwl4965_hw_set_hw_params
*
@ -2044,6 +1380,9 @@ int iwl4965_hw_set_hw_params(struct iwl_priv *priv)
priv->hw_params.rx_chains_num = 2;
priv->hw_params.valid_tx_ant = (IWL_ANTENNA_MAIN | IWL_ANTENNA_AUX);
priv->hw_params.valid_rx_ant = (IWL_ANTENNA_MAIN | IWL_ANTENNA_AUX);
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
priv->hw_params.sens = &iwl4965_sensitivity;
#endif
return 0;
}
@ -3202,7 +2541,7 @@ void iwl4965_set_rxon_chain(struct iwl_priv *priv)
/* Tell uCode which antennas are actually connected.
* Before first association, we assume all antennas are connected.
* Just after first association, iwl4965_noise_calibration()
* Just after first association, iwl_chain_noise_calibration()
* checks which antennas actually *are* connected. */
priv->staging_rxon.rx_chain |=
cpu_to_le16(priv->valid_antenna << RXON_RX_CHAIN_VALID_POS);
@ -3412,7 +2751,7 @@ void iwl4965_hw_rx_statistics(struct iwl_priv *priv, struct iwl4965_rx_mem_buffe
if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)) &&
(pkt->hdr.cmd == STATISTICS_NOTIFICATION)) {
iwl4965_rx_calc_noise(priv);
#ifdef CONFIG_IWL4965_SENSITIVITY
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
queue_work(priv->workqueue, &priv->sensitivity_work);
#endif
}
@ -4139,7 +3478,7 @@ static void iwl4965_rx_missed_beacon_notif(struct iwl_priv *priv,
struct iwl4965_rx_mem_buffer *rxb)
{
#ifdef CONFIG_IWL4965_SENSITIVITY
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
struct iwl4965_rx_packet *pkt = (void *)rxb->skb->data;
struct iwl4965_missed_beacon_notif *missed_beacon;
@ -4150,11 +3489,10 @@ static void iwl4965_rx_missed_beacon_notif(struct iwl_priv *priv,
le32_to_cpu(missed_beacon->total_missed_becons),
le32_to_cpu(missed_beacon->num_recvd_beacons),
le32_to_cpu(missed_beacon->num_expected_beacons));
priv->sensitivity_data.state = IWL_SENS_CALIB_NEED_REINIT;
if (unlikely(!test_bit(STATUS_SCANNING, &priv->status)))
queue_work(priv->workqueue, &priv->sensitivity_work);
if (!test_bit(STATUS_SCANNING, &priv->status))
iwl_init_sensitivity(priv);
}
#endif /*CONFIG_IWL4965_SENSITIVITY*/
#endif /*CONFIG_IWL4965_RUN_TIME_CALIB*/
}
#ifdef CONFIG_IWL4965_HT
@ -4930,7 +4268,7 @@ void iwl4965_hw_rx_handler_setup(struct iwl_priv *priv)
void iwl4965_hw_setup_deferred_work(struct iwl_priv *priv)
{
INIT_WORK(&priv->txpower_work, iwl4965_bg_txpower_work);
#ifdef CONFIG_IWL4965_SENSITIVITY
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
INIT_WORK(&priv->sensitivity_work, iwl4965_bg_sensitivity_work);
#endif
init_timer(&priv->statistics_periodic);
@ -4952,6 +4290,10 @@ static struct iwl_hcmd_ops iwl4965_hcmd = {
static struct iwl_hcmd_utils_ops iwl4965_hcmd_utils = {
.enqueue_hcmd = iwl4965_enqueue_hcmd,
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
.chain_noise_reset = iwl4965_chain_noise_reset,
.gain_computation = iwl4965_gain_computation,
#endif
};
static struct iwl_lib_ops iwl4965_lib = {

68
drivers/net/wireless/iwlwifi/iwl-4965.h
View File

@ -566,6 +566,29 @@ struct iwl4965_ibss_seq {
struct list_head list;
};
struct iwl_sensitivity_ranges {
u16 min_nrg_cck;
u16 max_nrg_cck;
u16 nrg_th_cck;
u16 nrg_th_ofdm;
u16 auto_corr_min_ofdm;
u16 auto_corr_min_ofdm_mrc;
u16 auto_corr_min_ofdm_x1;
u16 auto_corr_min_ofdm_mrc_x1;
u16 auto_corr_max_ofdm;
u16 auto_corr_max_ofdm_mrc;
u16 auto_corr_max_ofdm_x1;
u16 auto_corr_max_ofdm_mrc_x1;
u16 auto_corr_max_cck;
u16 auto_corr_max_cck_mrc;
u16 auto_corr_min_cck;
u16 auto_corr_min_cck_mrc;
};
/**
* struct iwl_hw_params
* @max_txq_num: Max # Tx queues supported
@ -576,6 +599,7 @@ struct iwl4965_ibss_seq {
* @max_rxq_log: Log-base-2 of max_rxq_size
* @max_stations:
* @bcast_sta_id:
* @struct iwl_sensitivity_ranges: range of sensitivity values
*/
struct iwl_hw_params {
u16 max_txq_num;
@ -590,6 +614,9 @@ struct iwl_hw_params {
u32 max_pkt_size;
u8 max_stations;
u8 bcast_sta_id;
#ifdef CONFIG_IWLWIFI_RUN_TIME_CALIB
const struct iwl_sensitivity_ranges *sens;
#endif
};
#define HT_SHORT_GI_20MHZ_ONLY (1 << 0)
@ -732,9 +759,6 @@ extern void iwl4965_add_station(struct iwl_priv *priv, const u8 *addr,
extern void iwl4965_set_rxon_chain(struct iwl_priv *priv);
extern int iwl4965_alive_notify(struct iwl_priv *priv);
extern void iwl4965_update_rate_scaling(struct iwl_priv *priv, u8 mode);
extern void iwl4965_chain_noise_reset(struct iwl_priv *priv);
extern void iwl4965_init_sensitivity(struct iwl_priv *priv, u8 flags,
u8 force);
extern void iwl4965_rf_kill_ct_config(struct iwl_priv *priv);
extern void iwl4965_hwrate_to_tx_control(struct iwl_priv *priv,
u32 rate_n_flags,
@ -818,23 +842,8 @@ struct iwl4965_lq_mngr {
#define MAX_FA_CCK 50
#define MIN_FA_CCK 5
#define NRG_MIN_CCK 97
#define NRG_MAX_CCK 0
#define AUTO_CORR_MIN_OFDM 85
#define AUTO_CORR_MIN_OFDM_MRC 170
#define AUTO_CORR_MIN_OFDM_X1 105
#define AUTO_CORR_MIN_OFDM_MRC_X1 220
#define AUTO_CORR_MAX_OFDM 120
#define AUTO_CORR_MAX_OFDM_MRC 210
#define AUTO_CORR_MAX_OFDM_X1 140
#define AUTO_CORR_MAX_OFDM_MRC_X1 270
#define AUTO_CORR_STEP_OFDM 1
#define AUTO_CORR_MIN_CCK (125)
#define AUTO_CORR_MAX_CCK (200)
#define AUTO_CORR_MIN_CCK_MRC 200
#define AUTO_CORR_MAX_CCK_MRC 400
#define AUTO_CORR_STEP_CCK 3
#define AUTO_CORR_MAX_TH_CCK 160
@ -865,11 +874,6 @@ enum iwl4965_chain_noise_state {
IWL_CHAIN_NOISE_CALIBRATED = 2,
};
enum iwl4965_sensitivity_state {
IWL_SENS_CALIB_ALLOWED = 0,
IWL_SENS_CALIB_NEED_REINIT = 1,
};
enum iwl4965_calib_enabled_state {
IWL_CALIB_DISABLED = 0, /* must be 0 */
IWL_CALIB_ENABLED = 1,
@ -884,8 +888,9 @@ struct statistics_general_data {
u32 beacon_energy_c;
};
#ifdef CONFIG_IWLWIFI_RUN_TIME_CALIB
/* Sensitivity calib data */
struct iwl4965_sensitivity_data {
struct iwl_sensitivity_data {
u32 auto_corr_ofdm;
u32 auto_corr_ofdm_mrc;
u32 auto_corr_ofdm_x1;
@ -909,12 +914,10 @@ struct iwl4965_sensitivity_data {
s32 nrg_auto_corr_silence_diff;
u32 num_in_cck_no_fa;
u32 nrg_th_ofdm;
u8 state;
};
/* Chain noise (differential Rx gain) calib data */
struct iwl4965_chain_noise_data {
struct iwl_chain_noise_data {
u8 state;
u16 beacon_count;
u32 chain_noise_a;
@ -927,6 +930,7 @@ struct iwl4965_chain_noise_data {
u8 delta_gain_code[NUM_RX_CHAINS];
u8 radio_write;
};
#endif /* CONFIG_IWLWIFI_RUN_TIME_CALIB */
#define EEPROM_SEM_TIMEOUT 10 /* milliseconds */
#define EEPROM_SEM_RETRY_LIMIT 1000 /* number of attempts (not time) */
@ -1051,12 +1055,12 @@ struct iwl_priv {
u8 assoc_station_added;
u8 use_ant_b_for_management_frame; /* Tx antenna selection */
u8 valid_antenna; /* Bit mask of antennas actually connected */
#ifdef CONFIG_IWL4965_SENSITIVITY
struct iwl4965_sensitivity_data sensitivity_data;
struct iwl4965_chain_noise_data chain_noise_data;
u8 start_calib;
#ifdef CONFIG_IWLWIFI_RUN_TIME_CALIB
struct iwl_sensitivity_data sensitivity_data;
struct iwl_chain_noise_data chain_noise_data;
__le16 sensitivity_tbl[HD_TABLE_SIZE];
#endif /*CONFIG_IWL4965_SENSITIVITY*/
#endif /*CONFIG_IWLWIFI_RUN_TIME_CALIB*/
#ifdef CONFIG_IWL4965_HT
struct iwl_ht_info current_ht_config;
@ -1206,7 +1210,7 @@ struct iwl_priv {
#endif /* CONFIG_IWLWIFI_DEBUG */
struct work_struct txpower_work;
#ifdef CONFIG_IWL4965_SENSITIVITY
#ifdef CONFIG_IWL4965_RUN_TIME_CALIB
struct work_struct sensitivity_work;
#endif
struct timer_list statistics_periodic;

778
drivers/net/wireless/iwlwifi/iwl-calib.c Normal file
View File

@ -0,0 +1,778 @@
/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Tomas Winkler <tomas.winkler@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
#include <linux/kernel.h>
#include <net/mac80211.h>
#include "iwl-4965.h"
#include "iwl-core.h"
#include "iwl-calib.h"
#include "iwl-eeprom.h"
/* "false alarms" are signals that our DSP tries to lock onto,
* but then determines that they are either noise, or transmissions
* from a distant wireless network (also "noise", really) that get
* "stepped on" by stronger transmissions within our own network.
* This algorithm attempts to set a sensitivity level that is high
* enough to receive all of our own network traffic, but not so
* high that our DSP gets too busy trying to lock onto non-network
* activity/noise. */
static int iwl_sens_energy_cck(struct iwl_priv *priv,
u32 norm_fa,
u32 rx_enable_time,
struct statistics_general_data *rx_info)
{
u32 max_nrg_cck = 0;
int i = 0;
u8 max_silence_rssi = 0;
u32 silence_ref = 0;
u8 silence_rssi_a = 0;
u8 silence_rssi_b = 0;
u8 silence_rssi_c = 0;
u32 val;
/* "false_alarms" values below are cross-multiplications to assess the
* numbers of false alarms within the measured period of actual Rx
* (Rx is off when we're txing), vs the min/max expected false alarms
* (some should be expected if rx is sensitive enough) in a
* hypothetical listening period of 200 time units (TU), 204.8 msec:
*
* MIN_FA/fixed-time < false_alarms/actual-rx-time < MAX_FA/beacon-time
*
* */
u32 false_alarms = norm_fa * 200 * 1024;
u32 max_false_alarms = MAX_FA_CCK * rx_enable_time;
u32 min_false_alarms = MIN_FA_CCK * rx_enable_time;
struct iwl_sensitivity_data *data = NULL;
const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
data = &(priv->sensitivity_data);
data->nrg_auto_corr_silence_diff = 0;
/* Find max silence rssi among all 3 receivers.
* This is background noise, which may include transmissions from other
* networks, measured during silence before our network's beacon */
silence_rssi_a = (u8)((rx_info->beacon_silence_rssi_a &
ALL_BAND_FILTER) >> 8);
silence_rssi_b = (u8)((rx_info->beacon_silence_rssi_b &
ALL_BAND_FILTER) >> 8);
silence_rssi_c = (u8)((rx_info->beacon_silence_rssi_c &
ALL_BAND_FILTER) >> 8);
val = max(silence_rssi_b, silence_rssi_c);
max_silence_rssi = max(silence_rssi_a, (u8) val);
/* Store silence rssi in 20-beacon history table */
data->nrg_silence_rssi[data->nrg_silence_idx] = max_silence_rssi;
data->nrg_silence_idx++;
if (data->nrg_silence_idx >= NRG_NUM_PREV_STAT_L)
data->nrg_silence_idx = 0;
/* Find max silence rssi across 20 beacon history */
for (i = 0; i < NRG_NUM_PREV_STAT_L; i++) {
val = data->nrg_silence_rssi[i];
silence_ref = max(silence_ref, val);
}
IWL_DEBUG_CALIB("silence a %u, b %u, c %u, 20-bcn max %u\n",
silence_rssi_a, silence_rssi_b, silence_rssi_c,
silence_ref);
/* Find max rx energy (min value!) among all 3 receivers,
* measured during beacon frame.
* Save it in 10-beacon history table. */
i = data->nrg_energy_idx;
val = min(rx_info->beacon_energy_b, rx_info->beacon_energy_c);
data->nrg_value[i] = min(rx_info->beacon_energy_a, val);
data->nrg_energy_idx++;
if (data->nrg_energy_idx >= 10)
data->nrg_energy_idx = 0;
/* Find min rx energy (max value) across 10 beacon history.
* This is the minimum signal level that we want to receive well.
* Add backoff (margin so we don't miss slightly lower energy frames).
* This establishes an upper bound (min value) for energy threshold. */
max_nrg_cck = data->nrg_value[0];
for (i = 1; i < 10; i++)
max_nrg_cck = (u32) max(max_nrg_cck, (data->nrg_value[i]));
max_nrg_cck += 6;
IWL_DEBUG_CALIB("rx energy a %u, b %u, c %u, 10-bcn max/min %u\n",
rx_info->beacon_energy_a, rx_info->beacon_energy_b,
rx_info->beacon_energy_c, max_nrg_cck - 6);
/* Count number of consecutive beacons with fewer-than-desired
* false alarms. */
if (false_alarms < min_false_alarms)
data->num_in_cck_no_fa++;
else
data->num_in_cck_no_fa = 0;
IWL_DEBUG_CALIB("consecutive bcns with few false alarms = %u\n",
data->num_in_cck_no_fa);
/* If we got too many false alarms this time, reduce sensitivity */
if ((false_alarms > max_false_alarms) &&
(data->auto_corr_cck > AUTO_CORR_MAX_TH_CCK)) {
IWL_DEBUG_CALIB("norm FA %u > max FA %u\n",
false_alarms, max_false_alarms);
IWL_DEBUG_CALIB("... reducing sensitivity\n");
data->nrg_curr_state = IWL_FA_TOO_MANY;
/* Store for "fewer than desired" on later beacon */
data->nrg_silence_ref = silence_ref;
/* increase energy threshold (reduce nrg value)
* to decrease sensitivity */
if (data->nrg_th_cck >
(ranges->max_nrg_cck + NRG_STEP_CCK))
data->nrg_th_cck = data->nrg_th_cck
- NRG_STEP_CCK;
else
data->nrg_th_cck = ranges->max_nrg_cck;
/* Else if we got fewer than desired, increase sensitivity */
} else if (false_alarms < min_false_alarms) {
data->nrg_curr_state = IWL_FA_TOO_FEW;
/* Compare silence level with silence level for most recent
* healthy number or too many false alarms */
data->nrg_auto_corr_silence_diff = (s32)data->nrg_silence_ref -
(s32)silence_ref;
IWL_DEBUG_CALIB("norm FA %u < min FA %u, silence diff %d\n",
false_alarms, min_false_alarms,
data->nrg_auto_corr_silence_diff);
/* Increase value to increase sensitivity, but only if:
* 1a) previous beacon did *not* have *too many* false alarms
* 1b) AND there's a significant difference in Rx levels
* from a previous beacon with too many, or healthy # FAs
* OR 2) We've seen a lot of beacons (100) with too few
* false alarms */
if ((data->nrg_prev_state != IWL_FA_TOO_MANY) &&
((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
(data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
IWL_DEBUG_CALIB("... increasing sensitivity\n");
/* Increase nrg value to increase sensitivity */
val = data->nrg_th_cck + NRG_STEP_CCK;
data->nrg_th_cck = min((u32)ranges->min_nrg_cck, val);
} else {
IWL_DEBUG_CALIB("... but not changing sensitivity\n");
}
/* Else we got a healthy number of false alarms, keep status quo */
} else {
IWL_DEBUG_CALIB(" FA in safe zone\n");
data->nrg_curr_state = IWL_FA_GOOD_RANGE;
/* Store for use in "fewer than desired" with later beacon */
data->nrg_silence_ref = silence_ref;
/* If previous beacon had too many false alarms,
* give it some extra margin by reducing sensitivity again
* (but don't go below measured energy of desired Rx) */
if (IWL_FA_TOO_MANY == data->nrg_prev_state) {
IWL_DEBUG_CALIB("... increasing margin\n");
if (data->nrg_th_cck > (max_nrg_cck + NRG_MARGIN))
data->nrg_th_cck -= NRG_MARGIN;
else
data->nrg_th_cck = max_nrg_cck;
}
}
/* Make sure the energy threshold does not go above the measured
* energy of the desired Rx signals (reduced by backoff margin),
* or else we might start missing Rx frames.
* Lower value is higher energy, so we use max()!
*/
data->nrg_th_cck = max(max_nrg_cck, data->nrg_th_cck);
IWL_DEBUG_CALIB("new nrg_th_cck %u\n", data->nrg_th_cck);
data->nrg_prev_state = data->nrg_curr_state;
/* Auto-correlation CCK algorithm */
if (false_alarms > min_false_alarms) {
/* increase auto_corr values to decrease sensitivity
* so the DSP won't be disturbed by the noise
*/
if (data->auto_corr_cck < AUTO_CORR_MAX_TH_CCK)
data->auto_corr_cck = AUTO_CORR_MAX_TH_CCK + 1;
else {
val = data->auto_corr_cck + AUTO_CORR_STEP_CCK;
data->auto_corr_cck =
min((u32)ranges->auto_corr_max_cck, val);
}
val = data->auto_corr_cck_mrc + AUTO_CORR_STEP_CCK;
data->auto_corr_cck_mrc =
min((u32)ranges->auto_corr_max_cck_mrc, val);
} else if ((false_alarms < min_false_alarms) &&
((data->nrg_auto_corr_silence_diff > NRG_DIFF) ||
(data->num_in_cck_no_fa > MAX_NUMBER_CCK_NO_FA))) {
/* Decrease auto_corr values to increase sensitivity */
val = data->auto_corr_cck - AUTO_CORR_STEP_CCK;
data->auto_corr_cck =
max((u32)ranges->auto_corr_min_cck, val);
val = data->auto_corr_cck_mrc - AUTO_CORR_STEP_CCK;
data->auto_corr_cck_mrc =
max((u32)ranges->auto_corr_min_cck_mrc, val);
}
return 0;
}
static int iwl_sens_auto_corr_ofdm(struct iwl_priv *priv,
u32 norm_fa,
u32 rx_enable_time)
{
u32 val;
u32 false_alarms = norm_fa * 200 * 1024;
u32 max_false_alarms = MAX_FA_OFDM * rx_enable_time;
u32 min_false_alarms = MIN_FA_OFDM * rx_enable_time;
struct iwl_sensitivity_data *data = NULL;
const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
data = &(priv->sensitivity_data);
/* If we got too many false alarms this time, reduce sensitivity */
if (false_alarms > max_false_alarms) {
IWL_DEBUG_CALIB("norm FA %u > max FA %u)\n",
false_alarms, max_false_alarms);
val = data->auto_corr_ofdm + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm =
min((u32)ranges->auto_corr_max_ofdm, val);
val = data->auto_corr_ofdm_mrc + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc =
min((u32)ranges->auto_corr_max_ofdm_mrc, val);
val = data->auto_corr_ofdm_x1 + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_x1 =
min((u32)ranges->auto_corr_max_ofdm_x1, val);
val = data->auto_corr_ofdm_mrc_x1 + AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc_x1 =
min((u32)ranges->auto_corr_max_ofdm_mrc_x1, val);
}
/* Else if we got fewer than desired, increase sensitivity */
else if (false_alarms < min_false_alarms) {
IWL_DEBUG_CALIB("norm FA %u < min FA %u\n",
false_alarms, min_false_alarms);
val = data->auto_corr_ofdm - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm =
max((u32)ranges->auto_corr_min_ofdm, val);
val = data->auto_corr_ofdm_mrc - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc =
max((u32)ranges->auto_corr_min_ofdm_mrc, val);
val = data->auto_corr_ofdm_x1 - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_x1 =
max((u32)ranges->auto_corr_min_ofdm_x1, val);
val = data->auto_corr_ofdm_mrc_x1 - AUTO_CORR_STEP_OFDM;
data->auto_corr_ofdm_mrc_x1 =
max((u32)ranges->auto_corr_min_ofdm_mrc_x1, val);
} else {
IWL_DEBUG_CALIB("min FA %u < norm FA %u < max FA %u OK\n",
min_false_alarms, false_alarms, max_false_alarms);
}
return 0;
}
/* Prepare a SENSITIVITY_CMD, send to uCode if values have changed */
static int iwl_sensitivity_write(struct iwl_priv *priv)
{
int ret = 0;
struct iwl_sensitivity_cmd cmd ;
struct iwl_sensitivity_data *data = NULL;
struct iwl_host_cmd cmd_out = {
.id = SENSITIVITY_CMD,
.len = sizeof(struct iwl_sensitivity_cmd),
.meta.flags = CMD_ASYNC,
.data = &cmd,
};
data = &(priv->sensitivity_data);
memset(&cmd, 0, sizeof(cmd));
cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm);
cmd.table[HD_AUTO_CORR32_X4_TH_ADD_MIN_MRC_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm_mrc);
cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm_x1);
cmd.table[HD_AUTO_CORR32_X1_TH_ADD_MIN_MRC_INDEX] =
cpu_to_le16((u16)data->auto_corr_ofdm_mrc_x1);
cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_INDEX] =
cpu_to_le16((u16)data->auto_corr_cck);
cmd.table[HD_AUTO_CORR40_X4_TH_ADD_MIN_MRC_INDEX] =
cpu_to_le16((u16)data->auto_corr_cck_mrc);
cmd.table[HD_MIN_ENERGY_CCK_DET_INDEX] =
cpu_to_le16((u16)data->nrg_th_cck);
cmd.table[HD_MIN_ENERGY_OFDM_DET_INDEX] =
cpu_to_le16((u16)data->nrg_th_ofdm);
cmd.table[HD_BARKER_CORR_TH_ADD_MIN_INDEX] =
__constant_cpu_to_le16(190);
cmd.table[HD_BARKER_CORR_TH_ADD_MIN_MRC_INDEX] =
__constant_cpu_to_le16(390);
cmd.table[HD_OFDM_ENERGY_TH_IN_INDEX] =
__constant_cpu_to_le16(62);
IWL_DEBUG_CALIB("ofdm: ac %u mrc %u x1 %u mrc_x1 %u thresh %u\n",
data->auto_corr_ofdm, data->auto_corr_ofdm_mrc,
data->auto_corr_ofdm_x1, data->auto_corr_ofdm_mrc_x1,
data->nrg_th_ofdm);
IWL_DEBUG_CALIB("cck: ac %u mrc %u thresh %u\n",
data->auto_corr_cck, data->auto_corr_cck_mrc,
data->nrg_th_cck);
/* Update uCode's "work" table, and copy it to DSP */
cmd.control = SENSITIVITY_CMD_CONTROL_WORK_TABLE;
/* Don't send command to uCode if nothing has changed */
if (!memcmp(&cmd.table[0], &(priv->sensitivity_tbl[0]),
sizeof(u16)*HD_TABLE_SIZE)) {
IWL_DEBUG_CALIB("No change in SENSITIVITY_CMD\n");
return 0;
}
/* Copy table for comparison next time */
memcpy(&(priv->sensitivity_tbl[0]), &(cmd.table[0]),
sizeof(u16)*HD_TABLE_SIZE);
ret = iwl_send_cmd(priv, &cmd_out);
if (ret)
IWL_ERROR("SENSITIVITY_CMD failed\n");
return ret;
}
void iwl_init_sensitivity(struct iwl_priv *priv)
{
int ret = 0;
int i;
struct iwl_sensitivity_data *data = NULL;
const struct iwl_sensitivity_ranges *ranges = priv->hw_params.sens;
IWL_DEBUG_CALIB("Start iwl_init_sensitivity\n");
/* Clear driver's sensitivity algo data */
data = &(priv->sensitivity_data);
if (ranges == NULL)
/* can happen if IWLWIFI_RUN_TIME_CALIB is selected
* but no IWLXXXX_RUN_TIME_CALIB for specific is selected */
return;
memset(data, 0, sizeof(struct iwl_sensitivity_data));
data->num_in_cck_no_fa = 0;
data->nrg_curr_state = IWL_FA_TOO_MANY;
data->nrg_prev_state = IWL_FA_TOO_MANY;
data->nrg_silence_ref = 0;
data->nrg_silence_idx = 0;
data->nrg_energy_idx = 0;
for (i = 0; i < 10; i++)
data->nrg_value[i] = 0;
for (i = 0; i < NRG_NUM_PREV_STAT_L; i++)
data->nrg_silence_rssi[i] = 0;
data->auto_corr_ofdm = 90;
data->auto_corr_ofdm_mrc = ranges->auto_corr_min_ofdm_mrc;
data->auto_corr_ofdm_x1 = ranges->auto_corr_min_ofdm_x1;
data->auto_corr_ofdm_mrc_x1 = ranges->auto_corr_min_ofdm_mrc_x1;
data->auto_corr_cck = AUTO_CORR_CCK_MIN_VAL_DEF;
data->auto_corr_cck_mrc = ranges->auto_corr_min_cck_mrc;
data->nrg_th_cck = ranges->nrg_th_cck;
data->nrg_th_ofdm = ranges->nrg_th_ofdm;
data->last_bad_plcp_cnt_ofdm = 0;
data->last_fa_cnt_ofdm = 0;
data->last_bad_plcp_cnt_cck = 0;
data->last_fa_cnt_cck = 0;
ret |= iwl_sensitivity_write(priv);
IWL_DEBUG_CALIB("<<return 0x%X\n", ret);
}
EXPORT_SYMBOL(iwl_init_sensitivity);
void iwl_sensitivity_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *resp)
{
u32 rx_enable_time;
u32 fa_cck;
u32 fa_ofdm;
u32 bad_plcp_cck;
u32 bad_plcp_ofdm;
u32 norm_fa_ofdm;
u32 norm_fa_cck;
struct iwl_sensitivity_data *data = NULL;
struct statistics_rx_non_phy *rx_info = &(resp->rx.general);
struct statistics_rx *statistics = &(resp->rx);
unsigned long flags;
struct statistics_general_data statis;
data = &(priv->sensitivity_data);
if (!iwl_is_associated(priv)) {
IWL_DEBUG_CALIB("<< - not associated\n");
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
IWL_DEBUG_CALIB("<< invalid data.\n");
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* Extract Statistics: */
rx_enable_time = le32_to_cpu(rx_info->channel_load);
fa_cck = le32_to_cpu(statistics->cck.false_alarm_cnt);
fa_ofdm = le32_to_cpu(statistics->ofdm.false_alarm_cnt);
bad_plcp_cck = le32_to_cpu(statistics->cck.plcp_err);
bad_plcp_ofdm = le32_to_cpu(statistics->ofdm.plcp_err);
statis.beacon_silence_rssi_a =
le32_to_cpu(statistics->general.beacon_silence_rssi_a);
statis.beacon_silence_rssi_b =
le32_to_cpu(statistics->general.beacon_silence_rssi_b);
statis.beacon_silence_rssi_c =
le32_to_cpu(statistics->general.beacon_silence_rssi_c);
statis.beacon_energy_a =
le32_to_cpu(statistics->general.beacon_energy_a);
statis.beacon_energy_b =
le32_to_cpu(statistics->general.beacon_energy_b);
statis.beacon_energy_c =
le32_to_cpu(statistics->general.beacon_energy_c);
spin_unlock_irqrestore(&priv->lock, flags);
IWL_DEBUG_CALIB("rx_enable_time = %u usecs\n", rx_enable_time);
if (!rx_enable_time) {
IWL_DEBUG_CALIB("<< RX Enable Time == 0! \n");
return;
}
/* These statistics increase monotonically, and do not reset
* at each beacon. Calculate difference from last value, or just
* use the new statistics value if it has reset or wrapped around. */
if (data->last_bad_plcp_cnt_cck > bad_plcp_cck)
data->last_bad_plcp_cnt_cck = bad_plcp_cck;
else {
bad_plcp_cck -= data->last_bad_plcp_cnt_cck;
data->last_bad_plcp_cnt_cck += bad_plcp_cck;
}
if (data->last_bad_plcp_cnt_ofdm > bad_plcp_ofdm)
data->last_bad_plcp_cnt_ofdm = bad_plcp_ofdm;
else {
bad_plcp_ofdm -= data->last_bad_plcp_cnt_ofdm;
data->last_bad_plcp_cnt_ofdm += bad_plcp_ofdm;
}
if (data->last_fa_cnt_ofdm > fa_ofdm)
data->last_fa_cnt_ofdm = fa_ofdm;
else {
fa_ofdm -= data->last_fa_cnt_ofdm;
data->last_fa_cnt_ofdm += fa_ofdm;
}
if (data->last_fa_cnt_cck > fa_cck)
data->last_fa_cnt_cck = fa_cck;
else {
fa_cck -= data->last_fa_cnt_cck;
data->last_fa_cnt_cck += fa_cck;
}
/* Total aborted signal locks */
norm_fa_ofdm = fa_ofdm + bad_plcp_ofdm;
norm_fa_cck = fa_cck + bad_plcp_cck;
IWL_DEBUG_CALIB("cck: fa %u badp %u ofdm: fa %u badp %u\n", fa_cck,
bad_plcp_cck, fa_ofdm, bad_plcp_ofdm);
iwl_sens_auto_corr_ofdm(priv, norm_fa_ofdm, rx_enable_time);
iwl_sens_energy_cck(priv, norm_fa_cck, rx_enable_time, &statis);
iwl_sensitivity_write(priv);
return;
}
EXPORT_SYMBOL(iwl_sensitivity_calibration);
/*
* Accumulate 20 beacons of signal and noise statistics for each of
* 3 receivers/antennas/rx-chains, then figure out:
* 1) Which antennas are connected.
* 2) Differential rx gain settings to balance the 3 receivers.
*/
void iwl_chain_noise_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *stat_resp)
{
struct iwl_chain_noise_data *data = NULL;
u32 chain_noise_a;
u32 chain_noise_b;
u32 chain_noise_c;
u32 chain_sig_a;
u32 chain_sig_b;
u32 chain_sig_c;
u32 average_sig[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
u32 average_noise[NUM_RX_CHAINS] = {INITIALIZATION_VALUE};
u32 max_average_sig;
u16 max_average_sig_antenna_i;
u32 min_average_noise = MIN_AVERAGE_NOISE_MAX_VALUE;
u16 min_average_noise_antenna_i = INITIALIZATION_VALUE;
u16 i = 0;
u16 rxon_chnum = INITIALIZATION_VALUE;
u16 stat_chnum = INITIALIZATION_VALUE;
u8 rxon_band24;
u8 stat_band24;
u32 active_chains = 0;
u8 num_tx_chains;
unsigned long flags;
struct statistics_rx_non_phy *rx_info = &(stat_resp->rx.general);
data = &(priv->chain_noise_data);
/* Accumulate just the first 20 beacons after the first association,
* then we're done forever. */
if (data->state != IWL_CHAIN_NOISE_ACCUMULATE) {
if (data->state == IWL_CHAIN_NOISE_ALIVE)
IWL_DEBUG_CALIB("Wait for noise calib reset\n");
return;
}
spin_lock_irqsave(&priv->lock, flags);
if (rx_info->interference_data_flag != INTERFERENCE_DATA_AVAILABLE) {
IWL_DEBUG_CALIB(" << Interference data unavailable\n");
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
rxon_band24 = !!(priv->staging_rxon.flags & RXON_FLG_BAND_24G_MSK);
rxon_chnum = le16_to_cpu(priv->staging_rxon.channel);
stat_band24 = !!(stat_resp->flag & STATISTICS_REPLY_FLG_BAND_24G_MSK);
stat_chnum = le32_to_cpu(stat_resp->flag) >> 16;
/* Make sure we accumulate data for just the associated channel
* (even if scanning). */
if ((rxon_chnum != stat_chnum) || (rxon_band24 != stat_band24)) {
IWL_DEBUG_CALIB("Stats not from chan=%d, band24=%d\n",
rxon_chnum, rxon_band24);
spin_unlock_irqrestore(&priv->lock, flags);
return;
}
/* Accumulate beacon statistics values across 20 beacons */
chain_noise_a = le32_to_cpu(rx_info->beacon_silence_rssi_a) &
IN_BAND_FILTER;
chain_noise_b = le32_to_cpu(rx_info->beacon_silence_rssi_b) &
IN_BAND_FILTER;
chain_noise_c = le32_to_cpu(rx_info->beacon_silence_rssi_c) &
IN_BAND_FILTER;
chain_sig_a = le32_to_cpu(rx_info->beacon_rssi_a) & IN_BAND_FILTER;
chain_sig_b = le32_to_cpu(rx_info->beacon_rssi_b) & IN_BAND_FILTER;
chain_sig_c = le32_to_cpu(rx_info->beacon_rssi_c) & IN_BAND_FILTER;
spin_unlock_irqrestore(&priv->lock, flags);
data->beacon_count++;
data->chain_noise_a = (chain_noise_a + data->chain_noise_a);
data->chain_noise_b = (chain_noise_b + data->chain_noise_b);
data->chain_noise_c = (chain_noise_c + data->chain_noise_c);
data->chain_signal_a = (chain_sig_a + data->chain_signal_a);
data->chain_signal_b = (chain_sig_b + data->chain_signal_b);
data->chain_signal_c = (chain_sig_c + data->chain_signal_c);
IWL_DEBUG_CALIB("chan=%d, band24=%d, beacon=%d\n",
rxon_chnum, rxon_band24, data->beacon_count);
IWL_DEBUG_CALIB("chain_sig: a %d b %d c %d\n",
chain_sig_a, chain_sig_b, chain_sig_c);
IWL_DEBUG_CALIB("chain_noise: a %d b %d c %d\n",
chain_noise_a, chain_noise_b, chain_noise_c);
/* If this is the 20th beacon, determine:
* 1) Disconnected antennas (using signal strengths)
* 2) Differential gain (using silence noise) to balance receivers */
if (data->beacon_count != CAL_NUM_OF_BEACONS)
return;
/* Analyze signal for disconnected antenna */
average_sig[0] = (data->chain_signal_a) / CAL_NUM_OF_BEACONS;
average_sig[1] = (data->chain_signal_b) / CAL_NUM_OF_BEACONS;
average_sig[2] = (data->chain_signal_c) / CAL_NUM_OF_BEACONS;
if (average_sig[0] >= average_sig[1]) {
max_average_sig = average_sig[0];
max_average_sig_antenna_i = 0;
active_chains = (1 << max_average_sig_antenna_i);
} else {
max_average_sig = average_sig[1];
max_average_sig_antenna_i = 1;
active_chains = (1 << max_average_sig_antenna_i);
}
if (average_sig[2] >= max_average_sig) {
max_average_sig = average_sig[2];
max_average_sig_antenna_i = 2;
active_chains = (1 << max_average_sig_antenna_i);
}
IWL_DEBUG_CALIB("average_sig: a %d b %d c %d\n",
average_sig[0], average_sig[1], average_sig[2]);
IWL_DEBUG_CALIB("max_average_sig = %d, antenna %d\n",
max_average_sig, max_average_sig_antenna_i);
/* Compare signal strengths for all 3 receivers. */
for (i = 0; i < NUM_RX_CHAINS; i++) {
if (i != max_average_sig_antenna_i) {
s32 rssi_delta = (max_average_sig - average_sig[i]);
/* If signal is very weak, compared with
* strongest, mark it as disconnected. */
if (rssi_delta > MAXIMUM_ALLOWED_PATHLOSS)
data->disconn_array[i] = 1;
else
active_chains |= (1 << i);
IWL_DEBUG_CALIB("i = %d rssiDelta = %d "
"disconn_array[i] = %d\n",
i, rssi_delta, data->disconn_array[i]);
}
}
num_tx_chains = 0;
for (i = 0; i < NUM_RX_CHAINS; i++) {
/* loops on all the bits of
* priv->hw_setting.valid_tx_ant */
u8 ant_msk = (1 << i);
if (!(priv->hw_params.valid_tx_ant & ant_msk))
continue;
num_tx_chains++;
if (data->disconn_array[i] == 0)
/* there is a Tx antenna connected */
break;
if (num_tx_chains == priv->hw_params.tx_chains_num &&
data->disconn_array[i]) {
/* This is the last TX antenna and is also
* disconnected connect it anyway */
data->disconn_array[i] = 0;
active_chains |= ant_msk;
IWL_DEBUG_CALIB("All Tx chains are disconnected W/A - "
"declare %d as connected\n", i);
break;
}
}
IWL_DEBUG_CALIB("active_chains (bitwise) = 0x%x\n",
active_chains);
/* Save for use within RXON, TX, SCAN commands, etc. */
priv->valid_antenna = active_chains;
/* Analyze noise for rx balance */
average_noise[0] = ((data->chain_noise_a)/CAL_NUM_OF_BEACONS);
average_noise[1] = ((data->chain_noise_b)/CAL_NUM_OF_BEACONS);
average_noise[2] = ((data->chain_noise_c)/CAL_NUM_OF_BEACONS);
for (i = 0; i < NUM_RX_CHAINS; i++) {
if (!(data->disconn_array[i]) &&
(average_noise[i] <= min_average_noise)) {
/* This means that chain i is active and has
* lower noise values so far: */
min_average_noise = average_noise[i];
min_average_noise_antenna_i = i;
}
}
IWL_DEBUG_CALIB("average_noise: a %d b %d c %d\n",
average_noise[0], average_noise[1],
average_noise[2]);
IWL_DEBUG_CALIB("min_average_noise = %d, antenna %d\n",
min_average_noise, min_average_noise_antenna_i);
priv->cfg->ops->utils->gain_computation(priv, average_noise,
min_average_noise_antenna_i, min_average_noise);
}
EXPORT_SYMBOL(iwl_chain_noise_calibration);

104
drivers/net/wireless/iwlwifi/iwl-calib.h Normal file
View File

@ -0,0 +1,104 @@
/******************************************************************************
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Tomas Winkler <tomas.winkler@intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
* BSD LICENSE
*
* Copyright(c) 2005 - 2008 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*****************************************************************************/
#ifndef __iwl_calib_h__
#define __iwl_calib_h__
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/version.h>
#include <net/mac80211.h>
#include "iwl-eeprom.h"
#include "iwl-core.h"
#include "iwl-4965.h"
#ifdef CONFIG_IWLWIFI_RUN_TIME_CALIB
void iwl_chain_noise_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *stat_resp);
void iwl_sensitivity_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *resp);
void iwl_init_sensitivity(struct iwl_priv *priv);
static inline void iwl_chain_noise_reset(struct iwl_priv *priv)
{
if (priv->cfg->ops->utils->chain_noise_reset)
priv->cfg->ops->utils->chain_noise_reset(priv);
}
#else
static inline void iwl_chain_noise_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *stat_resp)
{
}
static inline void iwl_sensitivity_calibration(struct iwl_priv *priv,
struct iwl4965_notif_statistics *resp)
{
}
static inline void iwl_init_sensitivity(struct iwl_priv *priv)
{
}
static inline void iwl_chain_noise_reset(struct iwl_priv *priv)
{
}
#endif
#endif /* __iwl_calib_h__ */

7
drivers/net/wireless/iwlwifi/iwl-core.h
View File

@ -87,6 +87,13 @@ struct iwl_hcmd_ops {
};
struct iwl_hcmd_utils_ops {
int (*enqueue_hcmd)(struct iwl_priv *priv, struct iwl_host_cmd *cmd);
#ifdef CONFIG_IWLWIFI_RUN_TIME_CALIB
void (*gain_computation)(struct iwl_priv *priv,
u32 *average_noise,
u16 min_average_noise_antennat_i,
u32 min_average_noise);
void (*chain_noise_reset)(struct iwl_priv *priv);
#endif
};
struct iwl_lib_ops {

18
drivers/net/wireless/iwlwifi/iwl4965-base.c
View File

@ -51,6 +51,7 @@
#include "iwl-io.h"
#include "iwl-helpers.h"
#include "iwl-sta.h"
#include "iwl-calib.h"
static int iwl4965_tx_queue_update_write_ptr(struct iwl_priv *priv,
struct iwl4965_tx_queue *txq);
@ -795,14 +796,6 @@ static int iwl4965_commit_rxon(struct iwl_priv *priv)
/* station table will be cleared */
priv->assoc_station_added = 0;
#ifdef CONFIG_IWL4965_SENSITIVITY
priv->sensitivity_data.state = IWL_SENS_CALIB_NEED_REINIT;
if (!priv->error_recovering)
priv->start_calib = 0;
iwl4965_init_sensitivity(priv, CMD_ASYNC, 1);
#endif /* CONFIG_IWL4965_SENSITIVITY */
/* If we are currently associated and the new config requires
* an RXON_ASSOC and the new config wants the associated mask enabled,
* we must clear the associated from the active configuration
@ -846,13 +839,10 @@ static int iwl4965_commit_rxon(struct iwl_priv *priv)
iwlcore_clear_stations_table(priv);
#ifdef CONFIG_IWL4965_SENSITIVITY
if (!priv->error_recovering)
priv->start_calib = 0;
priv->sensitivity_data.state = IWL_SENS_CALIB_NEED_REINIT;
iwl4965_init_sensitivity(priv, CMD_ASYNC, 1);
#endif /* CONFIG_IWL4965_SENSITIVITY */
iwl_init_sensitivity(priv);
memcpy(active_rxon, &priv->staging_rxon, sizeof(*active_rxon));
@ -6040,11 +6030,9 @@ static void iwl4965_post_associate(struct iwl_priv *priv)
iwl4965_sequence_reset(priv);
#ifdef CONFIG_IWL4965_SENSITIVITY
/* Enable Rx differential gain and sensitivity calibrations */
iwl4965_chain_noise_reset(priv);
iwl_chain_noise_reset(priv);
priv->start_calib = 1;
#endif /* CONFIG_IWL4965_SENSITIVITY */
if (priv->iw_mode == IEEE80211_IF_TYPE_IBSS)
priv->assoc_station_added = 1;