iwl-4965.c

linux内核源码

	IWL_DEBUG_INFO("HW Revision ID = 0x%X\n", rev_id);

	iwl4965_nic_set_pwr_src(priv, 1);
	spin_lock_irqsave(&priv->lock, flags);

	if ((rev_id & 0x80) == 0x80 && (rev_id & 0x7f) < 8) {
		pci_read_config_dword(priv->pci_dev, PCI_REG_WUM8, &val);
		/* Enable No Snoop field */
		pci_write_config_dword(priv->pci_dev, PCI_REG_WUM8,
				       val & ~(1 << 11));
	}

	spin_unlock_irqrestore(&priv->lock, flags);

	/* Read the EEPROM */
	rc = iwl_eeprom_init(priv);
	if (rc)
		return rc;

	if (priv->eeprom.calib_version < EEPROM_TX_POWER_VERSION_NEW) {
		IWL_ERROR("Older EEPROM detected!  Aborting.\n");
		return -EINVAL;
	}

	pci_read_config_byte(priv->pci_dev, PCI_LINK_CTRL, &val_link);

	/* disable L1 entry -- workaround for pre-B1 */
	pci_write_config_byte(priv->pci_dev, PCI_LINK_CTRL, val_link & ~0x02);

	spin_lock_irqsave(&priv->lock, flags);

	/* set CSR_HW_CONFIG_REG for uCode use */

	iwl_set_bit(priv, CSR_SW_VER, CSR_HW_IF_CONFIG_REG_BIT_KEDRON_R |
		    CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
		    CSR_HW_IF_CONFIG_REG_BIT_MAC_SI);

	rc = iwl_grab_restricted_access(priv);
	if (rc < 0) {
		spin_unlock_irqrestore(&priv->lock, flags);
		IWL_DEBUG_INFO("Failed to init the card\n");
		return rc;
	}

	iwl_read_restricted_reg(priv, APMG_PS_CTRL_REG);
	iwl_set_bits_restricted_reg(priv, APMG_PS_CTRL_REG,
				    APMG_PS_CTRL_VAL_RESET_REQ);
	udelay(5);
	iwl_clear_bits_restricted_reg(priv, APMG_PS_CTRL_REG,
				      APMG_PS_CTRL_VAL_RESET_REQ);

	iwl_release_restricted_access(priv);
	spin_unlock_irqrestore(&priv->lock, flags);

	iwl_hw_card_show_info(priv);

	/* end nic_init */

	/* Allocate the RX queue, or reset if it is already allocated */
	if (!rxq->bd) {
		rc = iwl_rx_queue_alloc(priv);
		if (rc) {
			IWL_ERROR("Unable to initialize Rx queue\n");
			return -ENOMEM;
		}
	} else
		iwl_rx_queue_reset(priv, rxq);

	iwl_rx_replenish(priv);

	iwl4965_rx_init(priv, rxq);

	spin_lock_irqsave(&priv->lock, flags);

	rxq->need_update = 1;
	iwl_rx_queue_update_write_ptr(priv, rxq);

	spin_unlock_irqrestore(&priv->lock, flags);
	rc = iwl4965_txq_ctx_reset(priv);
	if (rc)
		return rc;

	if (priv->eeprom.sku_cap & EEPROM_SKU_CAP_SW_RF_KILL_ENABLE)
		IWL_DEBUG_RF_KILL("SW RF KILL supported in EEPROM.\n");

	if (priv->eeprom.sku_cap & EEPROM_SKU_CAP_HW_RF_KILL_ENABLE)
		IWL_DEBUG_RF_KILL("HW RF KILL supported in EEPROM.\n");

	set_bit(STATUS_INIT, &priv->status);

	return 0;
}

int iwl_hw_nic_stop_master(struct iwl_priv *priv)
{
	int rc = 0;
	u32 reg_val;
	unsigned long flags;

	spin_lock_irqsave(&priv->lock, flags);

	/* set stop master bit */
	iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);

	reg_val = iwl_read32(priv, CSR_GP_CNTRL);

	if (CSR_GP_CNTRL_REG_FLAG_MAC_POWER_SAVE ==
	    (reg_val & CSR_GP_CNTRL_REG_MSK_POWER_SAVE_TYPE))
		IWL_DEBUG_INFO("Card in power save, master is already "
			       "stopped\n");
	else {
		rc = iwl_poll_bit(priv, CSR_RESET,
				  CSR_RESET_REG_FLAG_MASTER_DISABLED,
				  CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
		if (rc < 0) {
			spin_unlock_irqrestore(&priv->lock, flags);
			return rc;
		}
	}

	spin_unlock_irqrestore(&priv->lock, flags);
	IWL_DEBUG_INFO("stop master\n");

	return rc;
}

void iwl_hw_txq_ctx_stop(struct iwl_priv *priv)
{

	int txq_id;
	unsigned long flags;

	/* reset TFD queues */
	for (txq_id = 0; txq_id < priv->hw_setting.max_txq_num; txq_id++) {
		spin_lock_irqsave(&priv->lock, flags);
		if (iwl_grab_restricted_access(priv)) {
			spin_unlock_irqrestore(&priv->lock, flags);
			continue;
		}

		iwl_write_restricted(priv,
				     IWL_FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
				     0x0);
		iwl_poll_restricted_bit(priv, IWL_FH_TSSR_TX_STATUS_REG,
					IWL_FH_TSSR_TX_STATUS_REG_MSK_CHNL_IDLE
					(txq_id), 200);
		iwl_release_restricted_access(priv);
		spin_unlock_irqrestore(&priv->lock, flags);
	}

	iwl_hw_txq_ctx_free(priv);
}

int iwl_hw_nic_reset(struct iwl_priv *priv)
{
	int rc = 0;
	unsigned long flags;

	iwl_hw_nic_stop_master(priv);

	spin_lock_irqsave(&priv->lock, flags);

	iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

	udelay(10);

	iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
	rc = iwl_poll_bit(priv, CSR_RESET,
			  CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
			  CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25);

	udelay(10);

	rc = iwl_grab_restricted_access(priv);
	if (!rc) {
		iwl_write_restricted_reg(priv, APMG_CLK_EN_REG,
					 APMG_CLK_VAL_DMA_CLK_RQT |
					 APMG_CLK_VAL_BSM_CLK_RQT);

		udelay(10);

		iwl_set_bits_restricted_reg(priv, APMG_PCIDEV_STT_REG,
				APMG_PCIDEV_STT_VAL_L1_ACT_DIS);

		iwl_release_restricted_access(priv);
	}

	clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
	wake_up_interruptible(&priv->wait_command_queue);

	spin_unlock_irqrestore(&priv->lock, flags);

	return rc;

}

#define REG_RECALIB_PERIOD (60)

/**
 * iwl4965_bg_statistics_periodic - Timer callback to queue statistics
 *
 * This callback is provided in order to queue the statistics_work
 * in work_queue context (v. softirq)
 *
 * This timer function is continually reset to execute within
 * REG_RECALIB_PERIOD seconds since the last STATISTICS_NOTIFICATION
 * was received.  We need to ensure we receive the statistics in order
 * to update the temperature used for calibrating the TXPOWER.  However,
 * we can't send the statistics command from softirq context (which
 * is the context which timers run at) so we have to queue off the
 * statistics_work to actually send the command to the hardware.
 */
static void iwl4965_bg_statistics_periodic(unsigned long data)
{
	struct iwl_priv *priv = (struct iwl_priv *)data;

	queue_work(priv->workqueue, &priv->statistics_work);
}

/**
 * iwl4965_bg_statistics_work - Send the statistics request to the hardware.
 *
 * This is queued by iwl_bg_statistics_periodic.
 */
static void iwl4965_bg_statistics_work(struct work_struct *work)
{
	struct iwl_priv *priv = container_of(work, struct iwl_priv,
					     statistics_work);

	if (test_bit(STATUS_EXIT_PENDING, &priv->status))
		return;

	mutex_lock(&priv->mutex);
	iwl_send_statistics_request(priv);
	mutex_unlock(&priv->mutex);
}

#define CT_LIMIT_CONST		259
#define TM_CT_KILL_THRESHOLD	110

void iwl4965_rf_kill_ct_config(struct iwl_priv *priv)
{
	struct iwl_ct_kill_config cmd;
	u32 R1, R2, R3;
	u32 temp_th;
	u32 crit_temperature;
	unsigned long flags;
	int rc = 0;

	spin_lock_irqsave(&priv->lock, flags);
	iwl_write32(priv, CSR_UCODE_DRV_GP1_CLR,
		    CSR_UCODE_DRV_GP1_REG_BIT_CT_KILL_EXIT);
	spin_unlock_irqrestore(&priv->lock, flags);

	if (priv->statistics.flag & STATISTICS_REPLY_FLG_FAT_MODE_MSK) {
		R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[1]);
		R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[1]);
		R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[1]);
	} else {
		R1 = (s32)le32_to_cpu(priv->card_alive_init.therm_r1[0]);
		R2 = (s32)le32_to_cpu(priv->card_alive_init.therm_r2[0]);
		R3 = (s32)le32_to_cpu(priv->card_alive_init.therm_r3[0]);
	}

	temp_th = CELSIUS_TO_KELVIN(TM_CT_KILL_THRESHOLD);

	crit_temperature = ((temp_th * (R3-R1))/CT_LIMIT_CONST) + R2;
	cmd.critical_temperature_R =  cpu_to_le32(crit_temperature);
	rc = iwl_send_cmd_pdu(priv,
			      REPLY_CT_KILL_CONFIG_CMD, sizeof(cmd), &cmd);
	if (rc)
		IWL_ERROR("REPLY_CT_KILL_CONFIG_CMD failed\n");
	else
		IWL_DEBUG_INFO("REPLY_CT_KILL_CONFIG_CMD succeeded\n");
}

#ifdef CONFIG_IWLWIFI_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 iwl_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;