iwl-4965.c 66.9 KB
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/******************************************************************************
 *
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 * Copyright(c) 2003 - 2009 Intel Corporation. All rights reserved.
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 *
 * 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.
 *
 * Contact Information:
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 *  Intel Linux Wireless <ilw@linux.intel.com>
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 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 *****************************************************************************/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/wireless.h>
#include <net/mac80211.h>
#include <linux/etherdevice.h>
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#include <asm/unaligned.h>
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#include "iwl-eeprom.h"
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#include "iwl-dev.h"
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#include "iwl-core.h"
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#include "iwl-io.h"
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#include "iwl-helpers.h"
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#include "iwl-calib.h"
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#include "iwl-sta.h"
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static int iwl4965_send_tx_power(struct iwl_priv *priv);
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static int iwl4965_hw_get_temperature(const struct iwl_priv *priv);
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/* Highest firmware API version supported */
#define IWL4965_UCODE_API_MAX 2

/* Lowest firmware API version supported */
#define IWL4965_UCODE_API_MIN 2

#define IWL4965_FW_PRE "iwlwifi-4965-"
#define _IWL4965_MODULE_FIRMWARE(api) IWL4965_FW_PRE #api ".ucode"
#define IWL4965_MODULE_FIRMWARE(api) _IWL4965_MODULE_FIRMWARE(api)
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/* module parameters */
static struct iwl_mod_params iwl4965_mod_params = {
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	.num_of_queues = IWL49_NUM_QUEUES,
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	.num_of_ampdu_queues = IWL49_NUM_AMPDU_QUEUES,
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	.amsdu_size_8K = 1,
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	.restart_fw = 1,
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	/* the rest are 0 by default */
};

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/* check contents of special bootstrap uCode SRAM */
static int iwl4965_verify_bsm(struct iwl_priv *priv)
{
	__le32 *image = priv->ucode_boot.v_addr;
	u32 len = priv->ucode_boot.len;
	u32 reg;
	u32 val;

	IWL_DEBUG_INFO("Begin verify bsm\n");

	/* verify BSM SRAM contents */
	val = iwl_read_prph(priv, BSM_WR_DWCOUNT_REG);
	for (reg = BSM_SRAM_LOWER_BOUND;
	     reg < BSM_SRAM_LOWER_BOUND + len;
	     reg += sizeof(u32), image++) {
		val = iwl_read_prph(priv, reg);
		if (val != le32_to_cpu(*image)) {
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			IWL_ERR(priv, "BSM uCode verification failed at "
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				  "addr 0x%08X+%u (of %u), is 0x%x, s/b 0x%x\n",
				  BSM_SRAM_LOWER_BOUND,
				  reg - BSM_SRAM_LOWER_BOUND, len,
				  val, le32_to_cpu(*image));
			return -EIO;
		}
	}

	IWL_DEBUG_INFO("BSM bootstrap uCode image OK\n");

	return 0;
}

/**
 * iwl4965_load_bsm - Load bootstrap instructions
 *
 * BSM operation:
 *
 * The Bootstrap State Machine (BSM) stores a short bootstrap uCode program
 * in special SRAM that does not power down during RFKILL.  When powering back
 * up after power-saving sleeps (or during initial uCode load), the BSM loads
 * the bootstrap program into the on-board processor, and starts it.
 *
 * The bootstrap program loads (via DMA) instructions and data for a new
 * program from host DRAM locations indicated by the host driver in the
 * BSM_DRAM_* registers.  Once the new program is loaded, it starts
 * automatically.
 *
 * When initializing the NIC, the host driver points the BSM to the
 * "initialize" uCode image.  This uCode sets up some internal data, then
 * notifies host via "initialize alive" that it is complete.
 *
 * The host then replaces the BSM_DRAM_* pointer values to point to the
 * normal runtime uCode instructions and a backup uCode data cache buffer
 * (filled initially with starting data values for the on-board processor),
 * then triggers the "initialize" uCode to load and launch the runtime uCode,
 * which begins normal operation.
 *
 * When doing a power-save shutdown, runtime uCode saves data SRAM into
 * the backup data cache in DRAM before SRAM is powered down.
 *
 * When powering back up, the BSM loads the bootstrap program.  This reloads
 * the runtime uCode instructions and the backup data cache into SRAM,
 * and re-launches the runtime uCode from where it left off.
 */
static int iwl4965_load_bsm(struct iwl_priv *priv)
{
	__le32 *image = priv->ucode_boot.v_addr;
	u32 len = priv->ucode_boot.len;
	dma_addr_t pinst;
	dma_addr_t pdata;
	u32 inst_len;
	u32 data_len;
	int i;
	u32 done;
	u32 reg_offset;
	int ret;

	IWL_DEBUG_INFO("Begin load bsm\n");

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	priv->ucode_type = UCODE_RT;

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	/* make sure bootstrap program is no larger than BSM's SRAM size */
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	if (len > IWL49_MAX_BSM_SIZE)
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		return -EINVAL;

	/* Tell bootstrap uCode where to find the "Initialize" uCode
	 *   in host DRAM ... host DRAM physical address bits 35:4 for 4965.
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	 * NOTE:  iwl_init_alive_start() will replace these values,
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	 *        after the "initialize" uCode has run, to point to
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	 *        runtime/protocol instructions and backup data cache.
	 */
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	pinst = priv->ucode_init.p_addr >> 4;
	pdata = priv->ucode_init_data.p_addr >> 4;
	inst_len = priv->ucode_init.len;
	data_len = priv->ucode_init_data.len;

	ret = iwl_grab_nic_access(priv);
	if (ret)
		return ret;

	iwl_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
	iwl_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
	iwl_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG, inst_len);
	iwl_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG, data_len);

	/* Fill BSM memory with bootstrap instructions */
	for (reg_offset = BSM_SRAM_LOWER_BOUND;
	     reg_offset < BSM_SRAM_LOWER_BOUND + len;
	     reg_offset += sizeof(u32), image++)
		_iwl_write_prph(priv, reg_offset, le32_to_cpu(*image));

	ret = iwl4965_verify_bsm(priv);
	if (ret) {
		iwl_release_nic_access(priv);
		return ret;
	}

	/* Tell BSM to copy from BSM SRAM into instruction SRAM, when asked */
	iwl_write_prph(priv, BSM_WR_MEM_SRC_REG, 0x0);
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	iwl_write_prph(priv, BSM_WR_MEM_DST_REG, IWL49_RTC_INST_LOWER_BOUND);
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	iwl_write_prph(priv, BSM_WR_DWCOUNT_REG, len / sizeof(u32));

	/* Load bootstrap code into instruction SRAM now,
	 *   to prepare to load "initialize" uCode */
	iwl_write_prph(priv, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START);

	/* Wait for load of bootstrap uCode to finish */
	for (i = 0; i < 100; i++) {
		done = iwl_read_prph(priv, BSM_WR_CTRL_REG);
		if (!(done & BSM_WR_CTRL_REG_BIT_START))
			break;
		udelay(10);
	}
	if (i < 100)
		IWL_DEBUG_INFO("BSM write complete, poll %d iterations\n", i);
	else {
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		IWL_ERR(priv, "BSM write did not complete!\n");
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		return -EIO;
	}

	/* Enable future boot loads whenever power management unit triggers it
	 *   (e.g. when powering back up after power-save shutdown) */
	iwl_write_prph(priv, BSM_WR_CTRL_REG, BSM_WR_CTRL_REG_BIT_START_EN);

	iwl_release_nic_access(priv);

	return 0;
}

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/**
 * iwl4965_set_ucode_ptrs - Set uCode address location
 *
 * Tell initialization uCode where to find runtime uCode.
 *
 * BSM registers initially contain pointers to initialization uCode.
 * We need to replace them to load runtime uCode inst and data,
 * and to save runtime data when powering down.
 */
static int iwl4965_set_ucode_ptrs(struct iwl_priv *priv)
{
	dma_addr_t pinst;
	dma_addr_t pdata;
	unsigned long flags;
	int ret = 0;

	/* bits 35:4 for 4965 */
	pinst = priv->ucode_code.p_addr >> 4;
	pdata = priv->ucode_data_backup.p_addr >> 4;

	spin_lock_irqsave(&priv->lock, flags);
	ret = iwl_grab_nic_access(priv);
	if (ret) {
		spin_unlock_irqrestore(&priv->lock, flags);
		return ret;
	}

	/* Tell bootstrap uCode where to find image to load */
	iwl_write_prph(priv, BSM_DRAM_INST_PTR_REG, pinst);
	iwl_write_prph(priv, BSM_DRAM_DATA_PTR_REG, pdata);
	iwl_write_prph(priv, BSM_DRAM_DATA_BYTECOUNT_REG,
				 priv->ucode_data.len);

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	/* Inst byte count must be last to set up, bit 31 signals uCode
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	 *   that all new ptr/size info is in place */
	iwl_write_prph(priv, BSM_DRAM_INST_BYTECOUNT_REG,
				 priv->ucode_code.len | BSM_DRAM_INST_LOAD);
	iwl_release_nic_access(priv);

	spin_unlock_irqrestore(&priv->lock, flags);

	IWL_DEBUG_INFO("Runtime uCode pointers are set.\n");

	return ret;
}

/**
 * iwl4965_init_alive_start - Called after REPLY_ALIVE notification received
 *
 * Called after REPLY_ALIVE notification received from "initialize" uCode.
 *
 * The 4965 "initialize" ALIVE reply contains calibration data for:
 *   Voltage, temperature, and MIMO tx gain correction, now stored in priv
 *   (3945 does not contain this data).
 *
 * Tell "initialize" uCode to go ahead and load the runtime uCode.
*/
static void iwl4965_init_alive_start(struct iwl_priv *priv)
{
	/* Check alive response for "valid" sign from uCode */
	if (priv->card_alive_init.is_valid != UCODE_VALID_OK) {
		/* We had an error bringing up the hardware, so take it
		 * all the way back down so we can try again */
		IWL_DEBUG_INFO("Initialize Alive failed.\n");
		goto restart;
	}

	/* Bootstrap uCode has loaded initialize uCode ... verify inst image.
	 * This is a paranoid check, because we would not have gotten the
	 * "initialize" alive if code weren't properly loaded.  */
	if (iwl_verify_ucode(priv)) {
		/* Runtime instruction load was bad;
		 * take it all the way back down so we can try again */
		IWL_DEBUG_INFO("Bad \"initialize\" uCode load.\n");
		goto restart;
	}

	/* Calculate temperature */
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	priv->temperature = iwl4965_hw_get_temperature(priv);
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	/* Send pointers to protocol/runtime uCode image ... init code will
	 * load and launch runtime uCode, which will send us another "Alive"
	 * notification. */
	IWL_DEBUG_INFO("Initialization Alive received.\n");
	if (iwl4965_set_ucode_ptrs(priv)) {
		/* Runtime instruction load won't happen;
		 * take it all the way back down so we can try again */
		IWL_DEBUG_INFO("Couldn't set up uCode pointers.\n");
		goto restart;
	}
	return;

restart:
	queue_work(priv->workqueue, &priv->restart);
}

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static int is_fat_channel(__le32 rxon_flags)
{
	return (rxon_flags & RXON_FLG_CHANNEL_MODE_PURE_40_MSK) ||
		(rxon_flags & RXON_FLG_CHANNEL_MODE_MIXED_MSK);
}

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/*
 * EEPROM handlers
 */
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static u16 iwl4965_eeprom_calib_version(struct iwl_priv *priv)
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{
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	return iwl_eeprom_query16(priv, EEPROM_4965_CALIB_VERSION_OFFSET);
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}
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/*
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 * Activate/Deactivate Tx DMA/FIFO channels according tx fifos mask
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 * must be called under priv->lock and mac access
 */
static void iwl4965_txq_set_sched(struct iwl_priv *priv, u32 mask)
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{
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	iwl_write_prph(priv, IWL49_SCD_TXFACT, mask);
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}

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static int iwl4965_apm_init(struct iwl_priv *priv)
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{
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	int ret = 0;
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	iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
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			  CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
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	/* disable L0s without affecting L1 :don't wait for ICH L0s bug W/A) */
	iwl_set_bit(priv, CSR_GIO_CHICKEN_BITS,
			  CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);

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	/* set "initialization complete" bit to move adapter
	 * D0U* --> D0A* state */
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	iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
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	/* wait for clock stabilization */
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	ret = iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
			CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
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	if (ret < 0) {
		IWL_DEBUG_INFO("Failed to init the card\n");
		goto out;
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	}

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	ret = iwl_grab_nic_access(priv);
	if (ret)
		goto out;
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	/* enable DMA */
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	iwl_write_prph(priv, APMG_CLK_CTRL_REG, APMG_CLK_VAL_DMA_CLK_RQT |
						APMG_CLK_VAL_BSM_CLK_RQT);
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	udelay(20);

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	/* disable L1-Active */
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	iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
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			  APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
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	iwl_release_nic_access(priv);
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out:
	return ret;
}

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static void iwl4965_nic_config(struct iwl_priv *priv)
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{
	unsigned long flags;
	u32 val;
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	u16 radio_cfg;
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	u16 link;
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	spin_lock_irqsave(&priv->lock, flags);

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	if ((priv->rev_id & 0x80) == 0x80 && (priv->rev_id & 0x7f) < 8) {
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		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));
	}

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	pci_read_config_word(priv->pci_dev, PCI_CFG_LINK_CTRL, &link);
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	/* L1 is enabled by BIOS */
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	if ((link & PCI_CFG_LINK_CTRL_VAL_L1_EN) == PCI_CFG_LINK_CTRL_VAL_L1_EN)
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		/* disable L0S disabled L1A enabled */
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		iwl_set_bit(priv, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
	else
		/* L0S enabled L1A disabled */
		iwl_clear_bit(priv, CSR_GIO_REG, CSR_GIO_REG_VAL_L0S_ENABLED);
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	radio_cfg = iwl_eeprom_query16(priv, EEPROM_RADIO_CONFIG);
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	/* write radio config values to register */
	if (EEPROM_RF_CFG_TYPE_MSK(radio_cfg) == EEPROM_4965_RF_CFG_TYPE_MAX)
		iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
			    EEPROM_RF_CFG_TYPE_MSK(radio_cfg) |
			    EEPROM_RF_CFG_STEP_MSK(radio_cfg) |
			    EEPROM_RF_CFG_DASH_MSK(radio_cfg));
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	/* set CSR_HW_CONFIG_REG for uCode use */
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	iwl_set_bit(priv, CSR_HW_IF_CONFIG_REG,
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		    CSR_HW_IF_CONFIG_REG_BIT_RADIO_SI |
		    CSR_HW_IF_CONFIG_REG_BIT_MAC_SI);
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	priv->calib_info = (struct iwl_eeprom_calib_info *)
		iwl_eeprom_query_addr(priv, EEPROM_4965_CALIB_TXPOWER_OFFSET);

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

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static int iwl4965_apm_stop_master(struct iwl_priv *priv)
{
	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);

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	iwl_poll_direct_bit(priv, CSR_RESET,
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			CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
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	spin_unlock_irqrestore(&priv->lock, flags);
	IWL_DEBUG_INFO("stop master\n");

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	return 0;
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}

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static void iwl4965_apm_stop(struct iwl_priv *priv)
{
	unsigned long flags;

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	iwl4965_apm_stop_master(priv);
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	spin_lock_irqsave(&priv->lock, flags);

	iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);

	udelay(10);
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	/* clear "init complete"  move adapter D0A* --> D0U state */
	iwl_clear_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
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	spin_unlock_irqrestore(&priv->lock, flags);
}

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static int iwl4965_apm_reset(struct iwl_priv *priv)
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{
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	int ret = 0;
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	unsigned long flags;

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	iwl4965_apm_stop_master(priv);
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	spin_lock_irqsave(&priv->lock, flags);

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	iwl_set_bit(priv, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
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	udelay(10);

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	/* FIXME: put here L1A -L0S w/a */

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	iwl_set_bit(priv, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
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	ret = iwl_poll_direct_bit(priv, CSR_GP_CNTRL,
			CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
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	if (ret < 0)
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		goto out;

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	udelay(10);

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	ret = iwl_grab_nic_access(priv);
	if (ret)
		goto out;
	/* Enable DMA and BSM Clock */
	iwl_write_prph(priv, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT |
					      APMG_CLK_VAL_BSM_CLK_RQT);
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	udelay(10);
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	/* disable L1A */
	iwl_set_bits_prph(priv, APMG_PCIDEV_STT_REG,
			  APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
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	iwl_release_nic_access(priv);
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	clear_bit(STATUS_HCMD_ACTIVE, &priv->status);
	wake_up_interruptible(&priv->wait_command_queue);

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out:
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	spin_unlock_irqrestore(&priv->lock, flags);

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	return ret;
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}

/* 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.  */
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static void iwl4965_chain_noise_reset(struct iwl_priv *priv)
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{
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	struct iwl_chain_noise_data *data = &(priv->chain_noise_data);
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	if ((data->state == IWL_CHAIN_NOISE_ALIVE) && iwl_is_associated(priv)) {
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		struct iwl_calib_diff_gain_cmd cmd;
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		memset(&cmd, 0, sizeof(cmd));
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		cmd.hdr.op_code = IWL_PHY_CALIBRATE_DIFF_GAIN_CMD;
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		cmd.diff_gain_a = 0;
		cmd.diff_gain_b = 0;
		cmd.diff_gain_c = 0;
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		if (iwl_send_cmd_pdu(priv, REPLY_PHY_CALIBRATION_CMD,
				 sizeof(cmd), &cmd))
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			IWL_ERR(priv,
				"Could not send REPLY_PHY_CALIBRATION_CMD\n");
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		data->state = IWL_CHAIN_NOISE_ACCUMULATE;
		IWL_DEBUG_CALIB("Run chain_noise_calibrate\n");
	}
}

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static void iwl4965_gain_computation(struct iwl_priv *priv,
		u32 *average_noise,
		u16 min_average_noise_antenna_i,
		u32 min_average_noise)
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{
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	int i, ret;
	struct iwl_chain_noise_data *data = &priv->chain_noise_data;
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	data->delta_gain_code[min_average_noise_antenna_i] = 0;
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	for (i = 0; i < NUM_RX_CHAINS; i++) {
		s32 delta_g = 0;
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		if (!(data->disconn_array[i]) &&
		    (data->delta_gain_code[i] ==
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			     CHAIN_NOISE_DELTA_GAIN_INIT_VAL)) {
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			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;
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		}
	}
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	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]);
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	/* Differential gain gets sent to uCode only once */
	if (!data->radio_write) {
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		struct iwl_calib_diff_gain_cmd cmd;
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		data->radio_write = 1;
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		memset(&cmd, 0, sizeof(cmd));
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		cmd.hdr.op_code = IWL_PHY_CALIBRATE_DIFF_GAIN_CMD;
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		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;
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	}
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	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;
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}

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static void iwl4965_rts_tx_cmd_flag(struct ieee80211_tx_info *info,
			__le32 *tx_flags)
{
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	if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
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		*tx_flags |= TX_CMD_FLG_RTS_MSK;
		*tx_flags &= ~TX_CMD_FLG_CTS_MSK;
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	} else if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
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		*tx_flags &= ~TX_CMD_FLG_RTS_MSK;
		*tx_flags |= TX_CMD_FLG_CTS_MSK;
	}
}

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static void iwl4965_bg_txpower_work(struct work_struct *work)
{
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	struct iwl_priv *priv = container_of(work, struct iwl_priv,
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			txpower_work);

	/* If a scan happened to start before we got here
	 * then just return; the statistics notification will
	 * kick off another scheduled work to compensate for
	 * any temperature delta we missed here. */
	if (test_bit(STATUS_EXIT_PENDING, &priv->status) ||
	    test_bit(STATUS_SCANNING, &priv->status))
		return;

	mutex_lock(&priv->mutex);

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	/* Regardless of if we are associated, we must reconfigure the
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	 * TX power since frames can be sent on non-radar channels while
	 * not associated */
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	iwl4965_send_tx_power(priv);
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	/* Update last_temperature to keep is_calib_needed from running
	 * when it isn't needed... */
	priv->last_temperature = priv->temperature;

	mutex_unlock(&priv->mutex);
}

/*
 * Acquire priv->lock before calling this function !
 */
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static void iwl4965_set_wr_ptrs(struct iwl_priv *priv, int txq_id, u32 index)
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{
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	iwl_write_direct32(priv, HBUS_TARG_WRPTR,
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			     (index & 0xff) | (txq_id << 8));
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	iwl_write_prph(priv, IWL49_SCD_QUEUE_RDPTR(txq_id), index);
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}

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/**
 * iwl4965_tx_queue_set_status - (optionally) start Tx/Cmd queue
 * @tx_fifo_id: Tx DMA/FIFO channel (range 0-7) that the queue will feed
 * @scd_retry: (1) Indicates queue will be used in aggregation mode
 *
 * NOTE:  Acquire priv->lock before calling this function !
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 */
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static void iwl4965_tx_queue_set_status(struct iwl_priv *priv,
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					struct iwl_tx_queue *txq,
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					int tx_fifo_id, int scd_retry)
{
	int txq_id = txq->q.id;
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	/* Find out whether to activate Tx queue */
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	int active = test_bit(txq_id, &priv->txq_ctx_active_msk) ? 1 : 0;
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	/* Set up and activate */
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	iwl_write_prph(priv, IWL49_SCD_QUEUE_STATUS_BITS(txq_id),
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			 (active << IWL49_SCD_QUEUE_STTS_REG_POS_ACTIVE) |
			 (tx_fifo_id << IWL49_SCD_QUEUE_STTS_REG_POS_TXF) |
			 (scd_retry << IWL49_SCD_QUEUE_STTS_REG_POS_WSL) |
			 (scd_retry << IWL49_SCD_QUEUE_STTS_REG_POS_SCD_ACK) |
			 IWL49_SCD_QUEUE_STTS_REG_MSK);
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	txq->sched_retry = scd_retry;

	IWL_DEBUG_INFO("%s %s Queue %d on AC %d\n",
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		       active ? "Activate" : "Deactivate",
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		       scd_retry ? "BA" : "AC", txq_id, tx_fifo_id);
}

static const u16 default_queue_to_tx_fifo[] = {
	IWL_TX_FIFO_AC3,
	IWL_TX_FIFO_AC2,
	IWL_TX_FIFO_AC1,
	IWL_TX_FIFO_AC0,
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	IWL49_CMD_FIFO_NUM,
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	IWL_TX_FIFO_HCCA_1,
	IWL_TX_FIFO_HCCA_2
};

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static int iwl4965_alive_notify(struct iwl_priv *priv)
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{
	u32 a;
	unsigned long flags;
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	int ret;
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	int i, chan;
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	u32 reg_val;
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	spin_lock_irqsave(&priv->lock, flags);

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	ret = iwl_grab_nic_access(priv);
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	if (ret) {
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		spin_unlock_irqrestore(&priv->lock, flags);
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		return ret;
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	}

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	/* Clear 4965's internal Tx Scheduler data base */
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	priv->scd_base_addr = iwl_read_prph(priv, IWL49_SCD_SRAM_BASE_ADDR);
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	a = priv->scd_base_addr + IWL49_SCD_CONTEXT_DATA_OFFSET;
	for (; a < priv->scd_base_addr + IWL49_SCD_TX_STTS_BITMAP_OFFSET; a += 4)
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		iwl_write_targ_mem(priv, a, 0);
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	for (; a < priv->scd_base_addr + IWL49_SCD_TRANSLATE_TBL_OFFSET; a += 4)
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		iwl_write_targ_mem(priv, a, 0);
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	for (; a < sizeof(u16) * priv->hw_params.max_txq_num; a += 4)
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		iwl_write_targ_mem(priv, a, 0);
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	/* Tel 4965 where to find Tx byte count tables */
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	iwl_write_prph(priv, IWL49_SCD_DRAM_BASE_ADDR,
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			priv->scd_bc_tbls.dma >> 10);
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	/* Enable DMA channel */
	for (chan = 0; chan < FH49_TCSR_CHNL_NUM ; chan++)
		iwl_write_direct32(priv, FH_TCSR_CHNL_TX_CONFIG_REG(chan),
				FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
				FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE);

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	/* Update FH chicken bits */
	reg_val = iwl_read_direct32(priv, FH_TX_CHICKEN_BITS_REG);
	iwl_write_direct32(priv, FH_TX_CHICKEN_BITS_REG,
			   reg_val | FH_TX_CHICKEN_BITS_SCD_AUTO_RETRY_EN);

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	/* Disable chain mode for all queues */
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	iwl_write_prph(priv, IWL49_SCD_QUEUECHAIN_SEL, 0);
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	/* Initialize each Tx queue (including the command queue) */
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	for (i = 0; i < priv->hw_params.max_txq_num; i++) {
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		/* TFD circular buffer read/write indexes */
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		iwl_write_prph(priv, IWL49_SCD_QUEUE_RDPTR(i), 0);
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		iwl_write_direct32(priv, HBUS_TARG_WRPTR, 0 | (i << 8));
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		/* Max Tx Window size for Scheduler-ACK mode */
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		iwl_write_targ_mem(priv, priv->scd_base_addr +
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				IWL49_SCD_CONTEXT_QUEUE_OFFSET(i),
				(SCD_WIN_SIZE <<
				IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_POS) &
				IWL49_SCD_QUEUE_CTX_REG1_WIN_SIZE_MSK);
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		/* Frame limit */
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		iwl_write_targ_mem(priv, priv->scd_base_addr +
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				IWL49_SCD_CONTEXT_QUEUE_OFFSET(i) +
				sizeof(u32),
				(SCD_FRAME_LIMIT <<
				IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_POS) &
				IWL49_SCD_QUEUE_CTX_REG2_FRAME_LIMIT_MSK);
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	}
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	iwl_write_prph(priv, IWL49_SCD_INTERRUPT_MASK,
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				 (1 << priv->hw_params.max_txq_num) - 1);
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	/* Activate all Tx DMA/FIFO channels */
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	priv->cfg->ops->lib->txq_set_sched(priv, IWL_MASK(0, 6));
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	iwl4965_set_wr_ptrs(priv, IWL_CMD_QUEUE_NUM, 0);
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	/* Map each Tx/cmd queue to its corresponding fifo */
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	for (i = 0; i < ARRAY_SIZE(default_queue_to_tx_fifo); i++) {
		int ac = default_queue_to_tx_fifo[i];
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		iwl_txq_ctx_activate(priv, i);
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		iwl4965_tx_queue_set_status(priv, &priv->txq[i], ac, 0);
	}

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

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	return ret;
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}

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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,
};

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/**
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 * iwl4965_hw_set_hw_params
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 *
 * Called when initializing driver
 */
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static int iwl4965_hw_set_hw_params(struct iwl_priv *priv)
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{
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	if ((priv->cfg->mod_params->num_of_queues > IWL49_NUM_QUEUES) ||
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	    (priv->cfg->mod_params->num_of_queues < IWL_MIN_NUM_QUEUES)) {
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		IWL_ERR(priv,
			"invalid queues_num, should be between %d and %d\n",
			IWL_MIN_NUM_QUEUES, IWL49_NUM_QUEUES);
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		return -EINVAL;
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	}
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	priv->hw_params.max_txq_num = priv->cfg->mod_params->num_of_queues;
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	priv->hw_params.dma_chnl_num = FH49_TCSR_CHNL_NUM;
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	priv->hw_params.scd_bc_tbls_size =
			IWL49_NUM_QUEUES * sizeof(struct iwl4965_scd_bc_tbl);
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	priv->hw_params.max_stations = IWL4965_STATION_COUNT;
	priv->hw_params.bcast_sta_id = IWL4965_BROADCAST_ID;
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	priv->hw_params.max_data_size = IWL49_RTC_DATA_SIZE;
	priv->hw_params.max_inst_size = IWL49_RTC_INST_SIZE;
	priv->hw_params.max_bsm_size = BSM_SRAM_SIZE;
	priv->hw_params.fat_channel = BIT(IEEE80211_BAND_5GHZ);

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	priv->hw_params.rx_wrt_ptr_reg = FH_RSCSR_CHNL0_WPTR;

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	priv->hw_params.tx_chains_num = 2;
	priv->hw_params.rx_chains_num = 2;
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	priv->hw_params.valid_tx_ant = ANT_A | ANT_B;
	priv->hw_params.valid_rx_ant = ANT_A | ANT_B;
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	priv->hw_params.ct_kill_threshold = CELSIUS_TO_KELVIN(CT_KILL_THRESHOLD);

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	priv->hw_params.sens = &iwl4965_sensitivity;
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	return 0;
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}

static s32 iwl4965_math_div_round(s32 num, s32 denom, s32 *res)
{
	s32 sign = 1;

	if (num < 0) {
		sign = -sign;
		num = -num;
	}
	if (denom < 0) {
		sign = -sign;
		denom = -denom;
	}
	*res = 1;
	*res = ((num * 2 + denom) / (denom * 2)) * sign;

	return 1;
}

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/**
 * iwl4965_get_voltage_compensation - Power supply voltage comp for txpower
 *
 * Determines power supply voltage compensation for txpower calculations.
 * Returns number of 1/2-dB steps to subtract from gain table index,
 * to compensate for difference between power supply voltage during
 * factory measurements, vs. current power supply voltage.
 *
 * Voltage indication is higher for lower voltage.
 * Lower voltage requires more gain (lower gain table index).
 */
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static s32 iwl4965_get_voltage_compensation(s32 eeprom_voltage,
					    s32 current_voltage)
{
	s32 comp = 0;

	if ((TX_POWER_IWL_ILLEGAL_VOLTAGE == eeprom_voltage) ||
	    (TX_POWER_IWL_ILLEGAL_VOLTAGE == current_voltage))
		return 0;

	iwl4965_math_div_round(current_voltage - eeprom_voltage,
			       TX_POWER_IWL_VOLTAGE_CODES_PER_03V, &comp);

	if (current_voltage > eeprom_voltage)
		comp *= 2;
	if ((comp < -2) || (comp > 2))
		comp = 0;

	return comp;
}

static s32 iwl4965_get_tx_atten_grp(u16 channel)
{
	if (channel >= CALIB_IWL_TX_ATTEN_GR5_FCH &&
	    channel <= CALIB_IWL_TX_ATTEN_GR5_LCH)
		return CALIB_CH_GROUP_5;

	if (channel >= CALIB_IWL_TX_ATTEN_GR1_FCH &&
	    channel <= CALIB_IWL_TX_ATTEN_GR1_LCH)
		return CALIB_CH_GROUP_1;

	if (channel >= CALIB_IWL_TX_ATTEN_GR2_FCH &&
	    channel <= CALIB_IWL_TX_ATTEN_GR2_LCH)
		return CALIB_CH_GROUP_2;

	if (channel >= CALIB_IWL_TX_ATTEN_GR3_FCH &&
	    channel <= CALIB_IWL_TX_ATTEN_GR3_LCH)
		return CALIB_CH_GROUP_3;

	if (channel >= CALIB_IWL_TX_ATTEN_GR4_FCH &&
	    channel <= CALIB_IWL_TX_ATTEN_GR4_LCH)
		return CALIB_CH_GROUP_4;

	return -1;
}

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static u32 iwl4965_get_sub_band(const struct iwl_priv *priv, u32 channel)
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{
	s32 b = -1;

	for (b = 0; b < EEPROM_TX_POWER_BANDS; b++) {
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		if (priv->calib_info->band_info[b].ch_from == 0)
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			continue;

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		if ((channel >= priv->calib_info->band_info[b].ch_from)
		    && (channel <= priv->calib_info->band_info[b].ch_to))
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			break;
	}

	return b;
}

static s32 iwl4965_interpolate_value(s32 x, s32 x1, s32 y1, s32 x2, s32 y2)
{
	s32 val;

	if (x2 == x1)
		return y1;
	else {
		iwl4965_math_div_round((x2 - x) * (y1 - y2), (x2 - x1), &val);
		return val + y2;
	}
}

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/**
 * iwl4965_interpolate_chan - Interpolate factory measurements for one channel
 *
 * Interpolates factory measurements from the two sample channels within a
 * sub-band, to apply to channel of interest.  Interpolation is proportional to
 * differences in channel frequencies, which is proportional to differences
 * in channel number.
 */
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static int iwl4965_interpolate_chan(struct iwl_priv *priv, u32 channel,
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				    struct iwl_eeprom_calib_ch_info *chan_info)
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{
	s32 s = -1;
	u32 c;
	u32 m;
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	const struct iwl_eeprom_calib_measure *m1;
	const struct iwl_eeprom_calib_measure *m2;
	struct iwl_eeprom_calib_measure *omeas;
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	u32 ch_i1;
	u32 ch_i2;

	s = iwl4965_get_sub_band(priv, channel);
	if (s >= EEPROM_TX_POWER_BANDS) {
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		IWL_ERR(priv, "Tx Power can not find channel %d\n", channel);
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		return -1;
	}

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	ch_i1 = priv->calib_info->band_info[s].ch1.ch_num;
	ch_i2 = priv->calib_info->band_info[s].ch2.ch_num;
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	chan_info->ch_num = (u8) channel;

	IWL_DEBUG_TXPOWER("channel %d subband %d factory cal ch %d & %d\n",
			  channel, s, ch_i1, ch_i2);

	for (c = 0; c < EEPROM_TX_POWER_TX_CHAINS; c++) {
		for (m = 0; m < EEPROM_TX_POWER_MEASUREMENTS; m++) {
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			m1 = &(priv->calib_info->band_info[s].ch1.
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			       measurements[c][m]);
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			m2 = &(priv->calib_info->band_info[s].ch2.
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			       measurements[c][m]);
			omeas = &(chan_info->measurements[c][m]);

			omeas->actual_pow =
			    (u8) iwl4965_interpolate_value(channel, ch_i1,
							   m1->actual_pow,
							   ch_i2,
							   m2->actual_pow);
			omeas->gain_idx =
			    (u8) iwl4965_interpolate_value(channel, ch_i1,
							   m1->gain_idx, ch_i2,
							   m2->gain_idx);
			omeas->temperature =
			    (u8) iwl4965_interpolate_value(channel, ch_i1,
							   m1->temperature,
							   ch_i2,
							   m2->temperature);
			omeas->pa_det =
			    (s8) iwl4965_interpolate_value(channel, ch_i1,
							   m1->pa_det, ch_i2,
							   m2->pa_det);

			IWL_DEBUG_TXPOWER
			    ("chain %d meas %d AP1=%d AP2=%d AP=%d\n", c, m,
			     m1->actual_pow, m2->actual_pow, omeas->actual_pow);
			IWL_DEBUG_TXPOWER
			    ("chain %d meas %d NI1=%d NI2=%d NI=%d\n", c, m,
			     m1->gain_idx, m2->gain_idx, omeas->gain_idx);
			IWL_DEBUG_TXPOWER
			    ("chain %d meas %d PA1=%d PA2=%d PA=%d\n", c, m,
			     m1->pa_det, m2->pa_det, omeas->pa_det);
			IWL_DEBUG_TXPOWER
			    ("chain %d meas %d  T1=%d  T2=%d  T=%d\n", c, m,
			     m1->temperature, m2->temperature,
			     omeas->temperature);
		}
	}

	return 0;
}

/* bit-rate-dependent table to prevent Tx distortion, in half-dB units,
 * for OFDM 6, 12, 18, 24, 36, 48, 54, 60 MBit, and CCK all rates. */
static s32 back_off_table[] = {
	10, 10, 10, 10, 10, 15, 17, 20,	/* OFDM SISO 20 MHz */
	10, 10, 10, 10, 10, 15, 17, 20,	/* OFDM MIMO 20 MHz */
	10, 10, 10, 10, 10, 15, 17, 20,	/* OFDM SISO 40 MHz */
	10, 10, 10, 10, 10, 15, 17, 20,	/* OFDM MIMO 40 MHz */
	10			/* CCK */
};

/* Thermal compensation values for txpower for various frequency ranges ...
 *   ratios from 3:1 to 4.5:1 of degrees (Celsius) per half-dB gain adjust */
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static struct iwl4965_txpower_comp_entry {
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	s32 degrees_per_05db_a;
	s32 degrees_per_05db_a_denom;
} tx_power_cmp_tble[CALIB_CH_GROUP_MAX] = {
	{9, 2},			/* group 0 5.2, ch  34-43 */
	{4, 1},			/* group 1 5.2, ch  44-70 */
	{4, 1},			/* group 2 5.2, ch  71-124 */
	{4, 1},			/* group 3 5.2, ch 125-200 */
	{3, 1}			/* group 4 2.4, ch   all */
};

static s32 get_min_power_index(s32 rate_power_index, u32 band)
{
	if (!band) {
		if ((rate_power_index & 7) <= 4)
			return MIN_TX_GAIN_INDEX_52GHZ_EXT;
	}
	return MIN_TX_GAIN_INDEX;
}

struct gain_entry {
	u8 dsp;
	u8 radio;
};

static const struct gain_entry gain_table[2][108] = {
	/* 5.2GHz power gain index table */
	{
	 {123, 0x3F},		/* highest txpower */
	 {117, 0x3F},
	 {110, 0x3F},
	 {104, 0x3F},
	 {98, 0x3F},
	 {110, 0x3E},
	 {104, 0x3E},
	 {98, 0x3E},
	 {110, 0x3D},
	 {104, 0x3D},
	 {98, 0x3D},
	 {110, 0x3C},
	 {104, 0x3C},
	 {98, 0x3C},
	 {110, 0x3B},
	 {104, 0x3B},
	 {98, 0x3B},
	 {110, 0x3A},
	 {104, 0x3A},
	 {98, 0x3A},
	 {110, 0x39},
	 {104, 0x39},
	 {98, 0x39},
	 {110, 0x38},
	 {104, 0x38},
	 {98, 0x38},
	 {110, 0x37},
	 {104, 0x37},
	 {98, 0x37},
	 {110, 0x36},
	 {104, 0x36},
	 {98, 0x36},
	 {110, 0x35},
	 {104, 0x35},
	 {98, 0x35},
	 {110, 0x34},
	 {104, 0x34},
	 {98, 0x34},
	 {110, 0x33},
	 {104, 0x33},
	 {98, 0x33},
	 {110, 0x32},
	 {104, 0x32},
	 {98, 0x32},
	 {110, 0x31},
	 {104, 0x31},
	 {98, 0x31},
	 {110, 0x30},
	 {104, 0x30},
	 {98, 0x30},
	 {110, 0x25},
	 {104, 0x25},
	 {98, 0x25},
	 {110, 0x24},
	 {104, 0x24},
	 {98, 0x24},
	 {110, 0x23},
	 {104, 0x23},
	 {98, 0x23},
	 {110, 0x22},
	 {104, 0x18},
	 {98, 0x18},
	 {110, 0x17},
	 {104, 0x17},
	 {98, 0x17},
	 {110, 0x16},
	 {104, 0x16},
	 {98, 0x16},
	 {110, 0x15},
	 {104, 0x15},
	 {98, 0x15},
	 {110, 0x14},
	 {104, 0x14},
	 {98, 0x14},
	 {110, 0x13},
	 {104, 0x13},
	 {98, 0x13},
	 {110, 0x12},
	 {104, 0x08},
	 {98, 0x08},
	 {110, 0x07},
	 {104, 0x07},
	 {98, 0x07},
	 {110, 0x06},
	 {104, 0x06},
	 {98, 0x06},
	 {110, 0x05},
	 {104, 0x05},
	 {98, 0x05},
	 {110, 0x04},
	 {104, 0x04},
	 {98, 0x04},
	 {110, 0x03},
	 {104, 0x03},
	 {98, 0x03},
	 {110, 0x02},
	 {104, 0x02},
	 {98, 0x02},
	 {110, 0x01},
	 {104, 0x01},
	 {98, 0x01},
	 {110, 0x00},
	 {104, 0x00},
	 {98, 0x00},
	 {93, 0x00},
	 {88, 0x00},
	 {83, 0x00},
	 {78, 0x00},
	 },
	/* 2.4GHz power gain index table */
	{
	 {110, 0x3f},		/* highest txpower */
	 {104, 0x3f},
	 {98, 0x3f},
	 {110, 0x3e},
	 {104, 0x3e},
	 {98, 0x3e},
	 {110, 0x3d},
	 {104, 0x3d},
	 {98, 0x3d},
	 {110, 0x3c},
	 {104, 0x3c},
	 {98, 0x3c},
	 {110, 0x3b},
	 {104, 0x3b},
	 {98, 0x3b},
	 {110, 0x3a},
	 {104, 0x3a},
	 {98, 0x3a},
	 {110, 0x39},
	 {104, 0x39},
	 {98, 0x39},
	 {110, 0x38},
	 {104, 0x38},
	 {98, 0x38},
	 {110, 0x37},
	 {104, 0x37},
	 {98, 0x37},
	 {110, 0x36},
	 {104, 0x36},
	 {98, 0x36},
	 {110, 0x35},
	 {104, 0x35},
	 {98, 0x35},
	 {110, 0x34},
	 {104, 0x34},
	 {98, 0x34},
	 {110, 0x33},
	 {104, 0x33},
	 {98, 0x33},
	 {110, 0x32},
	 {104, 0x32},
	 {98, 0x32},
	 {110, 0x31},
	 {104, 0x31},
	 {98, 0x31},
	 {110, 0x30},
	 {104, 0x30},
	 {98, 0x30},
	 {110, 0x6},
	 {104, 0x6},
	 {98, 0x6},
	 {110, 0x5},
	 {104, 0x5},
	 {98, 0x5},
	 {110, 0x4},
	 {104, 0x4},
	 {98, 0x4},
	 {110, 0x3},
	 {104, 0x3},
	 {98, 0x3},
	 {110, 0x2},
	 {104, 0x2},
	 {98, 0x2},
	 {110, 0x1},
	 {104, 0x1},
	 {98, 0x1},
	 {110, 0x0},
	 {104, 0x0},
	 {98, 0x0},
	 {97, 0},
	 {96, 0},
	 {95, 0},
	 {94, 0},
	 {93, 0},
	 {92, 0},
	 {91, 0},
	 {90, 0},
	 {89, 0},
	 {88, 0},
	 {87, 0},
	 {86, 0},
	 {85, 0},
	 {84, 0},
	 {83, 0},
	 {82, 0},
	 {81, 0},
	 {80, 0},
	 {79, 0},
	 {78, 0},
	 {77, 0},
	 {76, 0},
	 {75, 0},
	 {74, 0},
	 {73, 0},
	 {72, 0},
	 {71, 0},
	 {70, 0},
	 {69, 0},
	 {68, 0},
	 {67, 0},
	 {66, 0},
	 {65, 0},
	 {64, 0},
	 {63, 0},
	 {62, 0},
	 {61, 0},
	 {60, 0},
	 {59, 0},
	 }
};

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static int iwl4965_fill_txpower_tbl(struct iwl_priv *priv, u8 band, u16 channel,
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				    u8 is_fat, u8 ctrl_chan_high,
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				    struct iwl4965_tx_power_db *tx_power_tbl)
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{
	u8 saturation_power;
	s32 target_power;
	s32 user_target_power;
	s32 power_limit;
	s32 current_temp;
	s32 reg_limit;
	s32 current_regulatory;
	s32 txatten_grp = CALIB_CH_GROUP_MAX;
	int i;
	int c;
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	const struct iwl_channel_info *ch_info = NULL;
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	struct iwl_eeprom_calib_ch_info ch_eeprom_info;
	const struct iwl_eeprom_calib_measure *measurement;
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	s16 voltage;
	s32 init_voltage;
	s32 voltage_compensation;
	s32 degrees_per_05db_num;
	s32 degrees_per_05db_denom;
	s32 factory_temp;
	s32 temperature_comp[2];
	s32 factory_gain_index[2];
	s32 factory_actual_pwr[2];
	s32 power_index;

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	/* tx_power_user_lmt is in dBm, convert to half-dBm (half-dB units
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	 *   are used for indexing into txpower table) */
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	user_target_power = 2 * priv->tx_power_user_lmt;
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	/* Get current (RXON) channel, band, width */
	IWL_DEBUG_TXPOWER("chan %d band %d is_fat %d\n", channel, band,
			  is_fat);

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	ch_info = iwl_get_channel_info(priv, priv->band, channel);

	if (!is_channel_valid(ch_info))
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		return -EINVAL;

	/* get txatten group, used to select 1) thermal txpower adjustment
	 *   and 2) mimo txpower balance between Tx chains. */
	txatten_grp = iwl4965_get_tx_atten_grp(channel);
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	if (txatten_grp < 0) {
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		IWL_ERR(priv, "Can't find txatten group for channel %d.\n",
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			  channel);
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		return -EINVAL;
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	}
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	IWL_DEBUG_TXPOWER("channel %d belongs to txatten group %d\n",
			  channel, txatten_grp);

	if (is_fat) {
		if (ctrl_chan_high)
			channel -= 2;
		else
			channel += 2;
	}

	/* hardware txpower limits ...
	 * saturation (clipping distortion) txpowers are in half-dBm */
	if (band)
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		saturation_power = priv->calib_info->saturation_power24;
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	else
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		saturation_power = priv->calib_info->saturation_power52;
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	if (saturation_power < IWL_TX_POWER_SATURATION_MIN ||
	    saturation_power > IWL_TX_POWER_SATURATION_MAX) {
		if (band)
			saturation_power = IWL_TX_POWER_DEFAULT_SATURATION_24;
		else
			saturation_power = IWL_TX_POWER_DEFAULT_SATURATION_52;
	}

	/* regulatory txpower limits ... reg_limit values are in half-dBm,
	 *   max_power_avg values are in dBm, convert * 2 */
	if (is_fat)
		reg_limit = ch_info->fat_max_power_avg * 2;
	else
		reg_limit = ch_info->max_power_avg * 2;

	if ((reg_limit < IWL_TX_POWER_REGULATORY_MIN) ||
	    (reg_limit > IWL_TX_POWER_REGULATORY_MAX)) {
		if (band)
			reg_limit = IWL_TX_POWER_DEFAULT_REGULATORY_24;
		else
			reg_limit = IWL_TX_POWER_DEFAULT_REGULATORY_52;
	}

	/* Interpolate txpower calibration values for this channel,
	 *   based on factory calibration tests on spaced channels. */
	iwl4965_interpolate_chan(priv, channel, &ch_eeprom_info);

	/* calculate tx gain adjustment based on power supply voltage */
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	voltage = priv->calib_info->voltage;
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	init_voltage = (s32)le32_to_cpu(priv->card_alive_init.voltage);
	voltage_compensation =
	    iwl4965_get_voltage_compensation(voltage, init_voltage);

	IWL_DEBUG_TXPOWER("curr volt %d eeprom volt %d volt comp %d\n",
			  init_voltage,
			  voltage, voltage_compensation);

	/* get current temperature (Celsius) */
	current_temp = max(priv->temperature, IWL_TX_POWER_TEMPERATURE_MIN);
	current_temp = min(priv->temperature, IWL_TX_POWER_TEMPERATURE_MAX);
	current_temp = KELVIN_TO_CELSIUS(current_temp);

	/* select thermal txpower adjustment params, based on channel group
	 *   (same frequency group used for mimo txatten adjustment) */
	degrees_per_05db_num =
	    tx_power_cmp_tble[txatten_grp].degrees_per_05db_a;
	degrees_per_05db_denom =
	    tx_power_cmp_tble[txatten_grp].degrees_per_05db_a_denom;

	/* get per-chain txpower values from factory measurements */
	for (c = 0; c < 2; c++) {
		measurement = &ch_eeprom_info.measurements[c][1];

		/* txgain adjustment (in half-dB steps) based on difference
		 *   between factory and current temperature */
		factory_temp = measurement->temperature;
		iwl4965_math_div_round((current_temp - factory_temp) *
				       degrees_per_05db_denom,
				       degrees_per_05db_num,
				       &temperature_comp[c]);

		factory_gain_index[c] = measurement->gain_idx;
		factory_actual_pwr[c] = measurement->actual_pow;

		IWL_DEBUG_TXPOWER("chain = %d\n", c);
		IWL_DEBUG_TXPOWER("fctry tmp %d, "
				  "curr tmp %d, comp %d steps\n",
				  factory_temp, current_temp,
				  temperature_comp[c]);

		IWL_DEBUG_TXPOWER("fctry idx %d, fctry pwr %d\n",
				  factory_gain_index[c],
				  factory_actual_pwr[c]);
	}

	/* for each of 33 bit-rates (including 1 for CCK) */
	for (i = 0; i < POWER_TABLE_NUM_ENTRIES; i++) {
		u8 is_mimo_rate;
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		union iwl4965_tx_power_dual_stream tx_power;
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