drivers/net/wireless/ath/ath5k/reset.c

/*
 * Copyright (c) 2004-2008 Reyk Floeter <reyk@openbsd.org>
 * Copyright (c) 2006-2008 Nick Kossifidis <mickflemm@gmail.com>
 * Copyright (c) 2007-2008 Luis Rodriguez <mcgrof@winlab.rutgers.edu>
 * Copyright (c) 2007-2008 Pavel Roskin <proski@gnu.org>
 * Copyright (c) 2007-2008 Jiri Slaby <jirislaby@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */

/*****************************\
  Reset functions and helpers
\*****************************/

#include <asm/unaligned.h>

#include <linux/pci.h> 		/* To determine if a card is pci-e */
#include <linux/log2.h>
#include "ath5k.h"
#include "reg.h"
#include "base.h"
#include "debug.h"


/******************\
* Helper functions *
\******************/

/*
 * Check if a register write has been completed
 */
int ath5k_hw_register_timeout(struct ath5k_hw *ah, u32 reg, u32 flag, u32 val,
			      bool is_set)
{
	int i;
	u32 data;

	for (i = AR5K_TUNE_REGISTER_TIMEOUT; i > 0; i--) {
		data = ath5k_hw_reg_read(ah, reg);
		if (is_set && (data & flag))
			break;
		else if ((data & flag) == val)
			break;
		udelay(15);
	}

	return (i <= 0) ? -EAGAIN : 0;
}


/*************************\
* Clock related functions *
\*************************/

/**
 * ath5k_hw_htoclock - Translate usec to hw clock units
 *
 * @ah: The &struct ath5k_hw
 * @usec: value in microseconds
 */
unsigned int ath5k_hw_htoclock(struct ath5k_hw *ah, unsigned int usec)
{
	struct ath_common *common = ath5k_hw_common(ah);
	return usec * common->clockrate;
}

/**
 * ath5k_hw_clocktoh - Translate hw clock units to usec
 * @clock: value in hw clock units
 */
unsigned int ath5k_hw_clocktoh(struct ath5k_hw *ah, unsigned int clock)
{
	struct ath_common *common = ath5k_hw_common(ah);
	return clock / common->clockrate;
}

/**
 * ath5k_hw_init_core_clock - Initialize core clock
 *
 * @ah The &struct ath5k_hw
 *
 * Initialize core clock parameters (usec, usec32, latencies etc).
 */
static void ath5k_hw_init_core_clock(struct ath5k_hw *ah)
{
	struct ieee80211_channel *channel = ah->ah_current_channel;
	struct ath_common *common = ath5k_hw_common(ah);
	u32 usec_reg, txlat, rxlat, usec, clock, sclock, txf2txs;

	/*
	 * Set core clock frequency
	 */
	if (channel->hw_value & CHANNEL_5GHZ)
		clock = 40; /* 802.11a */
	else if (channel->hw_value & CHANNEL_CCK)
		clock = 22; /* 802.11b */
	else
		clock = 44; /* 802.11g */

	/* Use clock multiplier for non-default
	 * bwmode */
	switch (ah->ah_bwmode) {
	case AR5K_BWMODE_40MHZ:
		clock *= 2;
		break;
	case AR5K_BWMODE_10MHZ:
		clock /= 2;
		break;
	case AR5K_BWMODE_5MHZ:
		clock /= 4;
		break;
	default:
		break;
	}

	common->clockrate = clock;

	/*
	 * Set USEC parameters
	 */
	/* Set USEC counter on PCU*/
	usec = clock - 1;
	usec = AR5K_REG_SM(usec, AR5K_USEC_1);

	/* Set usec duration on DCU */
	if (ah->ah_version != AR5K_AR5210)
		AR5K_REG_WRITE_BITS(ah, AR5K_DCU_GBL_IFS_MISC,
					AR5K_DCU_GBL_IFS_MISC_USEC_DUR,
					clock);

	/* Set 32MHz USEC counter */
	if ((ah->ah_radio == AR5K_RF5112) ||
	(ah->ah_radio == AR5K_RF5413))
	/* Remain on 40MHz clock ? */
		sclock = 40 - 1;
	else
		sclock = 32 - 1;
	sclock = AR5K_REG_SM(sclock, AR5K_USEC_32);

	/*
	 * Set tx/rx latencies
	 */
	usec_reg = ath5k_hw_reg_read(ah, AR5K_USEC_5211);
	txlat = AR5K_REG_MS(usec_reg, AR5K_USEC_TX_LATENCY_5211);
	rxlat = AR5K_REG_MS(usec_reg, AR5K_USEC_RX_LATENCY_5211);

	/*
	 * 5210 initvals don't include usec settings
	 * so we need to use magic values here for
	 * tx/rx latencies
	 */
	if (ah->ah_version == AR5K_AR5210) {
		/* same for turbo */
		txlat = AR5K_INIT_TX_LATENCY_5210;
		rxlat = AR5K_INIT_RX_LATENCY_5210;
	}

	if (ah->ah_mac_srev < AR5K_SREV_AR5211) {
		/* 5311 has different tx/rx latency masks
		 * from 5211, since we deal 5311 the same
		 * as 5211 when setting initvals, shift
		 * values here to their proper locations
		 *
		 * Note: Initvals indicate tx/rx/ latencies
		 * are the same for turbo mode */
		txlat = AR5K_REG_SM(txlat, AR5K_USEC_TX_LATENCY_5210);
		rxlat = AR5K_REG_SM(rxlat, AR5K_USEC_RX_LATENCY_5210);
	} else
	switch (ah->ah_bwmode) {
	case AR5K_BWMODE_10MHZ:
		txlat = AR5K_REG_SM(txlat * 2,
				AR5K_USEC_TX_LATENCY_5211);
		rxlat = AR5K_REG_SM(AR5K_INIT_RX_LAT_MAX,
				AR5K_USEC_RX_LATENCY_5211);
		txf2txs = AR5K_INIT_TXF2TXD_START_DELAY_10MHZ;
		break;
	case AR5K_BWMODE_5MHZ:
		txlat = AR5K_REG_SM(txlat * 4,
				AR5K_USEC_TX_LATENCY_5211);
		rxlat = AR5K_REG_SM(AR5K_INIT_RX_LAT_MAX,
				AR5K_USEC_RX_LATENCY_5211);
		txf2txs = AR5K_INIT_TXF2TXD_START_DELAY_5MHZ;
		break;
	case AR5K_BWMODE_40MHZ:
		txlat = AR5K_INIT_TX_LAT_MIN;
		rxlat = AR5K_REG_SM(rxlat / 2,
				AR5K_USEC_RX_LATENCY_5211);
		txf2txs = AR5K_INIT_TXF2TXD_START_DEFAULT;
		break;
	default:
		break;
	}

	usec_reg = (usec | sclock | txlat | rxlat);
	ath5k_hw_reg_write(ah, usec_reg, AR5K_USEC);

	/* On 5112 set tx frane to tx data start delay */
	if (ah->ah_radio == AR5K_RF5112) {
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_RF_CTL2,
					AR5K_PHY_RF_CTL2_TXF2TXD_START,
					txf2txs);
	}
}

/*
 * If there is an external 32KHz crystal available, use it
 * as ref. clock instead of 32/40MHz clock and baseband clocks
 * to save power during sleep or restore normal 32/40MHz
 * operation.
 *
 * XXX: When operating on 32KHz certain PHY registers (27 - 31,
 *	123 - 127) require delay on access.
 */
static void ath5k_hw_set_sleep_clock(struct ath5k_hw *ah, bool enable)
{
	struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
	u32 scal, spending;

	/* Only set 32KHz settings if we have an external
	 * 32KHz crystal present */
	if ((AR5K_EEPROM_HAS32KHZCRYSTAL(ee->ee_misc1) ||
	AR5K_EEPROM_HAS32KHZCRYSTAL_OLD(ee->ee_misc1)) &&
	enable) {

		/* 1 usec/cycle */
		AR5K_REG_WRITE_BITS(ah, AR5K_USEC_5211, AR5K_USEC_32, 1);
		/* Set up tsf increment on each cycle */
		AR5K_REG_WRITE_BITS(ah, AR5K_TSF_PARM, AR5K_TSF_PARM_INC, 61);

		/* Set baseband sleep control registers
		 * and sleep control rate */
		ath5k_hw_reg_write(ah, 0x1f, AR5K_PHY_SCR);

		if ((ah->ah_radio == AR5K_RF5112) ||
		(ah->ah_radio == AR5K_RF5413) ||
		(ah->ah_mac_version == (AR5K_SREV_AR2417 >> 4)))
			spending = 0x14;
		else
			spending = 0x18;
		ath5k_hw_reg_write(ah, spending, AR5K_PHY_SPENDING);

		if ((ah->ah_radio == AR5K_RF5112) ||
		(ah->ah_radio == AR5K_RF5413) ||
		(ah->ah_mac_version == (AR5K_SREV_AR2417 >> 4))) {
			ath5k_hw_reg_write(ah, 0x26, AR5K_PHY_SLMT);
			ath5k_hw_reg_write(ah, 0x0d, AR5K_PHY_SCAL);
			ath5k_hw_reg_write(ah, 0x07, AR5K_PHY_SCLOCK);
			ath5k_hw_reg_write(ah, 0x3f, AR5K_PHY_SDELAY);
			AR5K_REG_WRITE_BITS(ah, AR5K_PCICFG,
				AR5K_PCICFG_SLEEP_CLOCK_RATE, 0x02);
		} else {
			ath5k_hw_reg_write(ah, 0x0a, AR5K_PHY_SLMT);
			ath5k_hw_reg_write(ah, 0x0c, AR5K_PHY_SCAL);
			ath5k_hw_reg_write(ah, 0x03, AR5K_PHY_SCLOCK);
			ath5k_hw_reg_write(ah, 0x20, AR5K_PHY_SDELAY);
			AR5K_REG_WRITE_BITS(ah, AR5K_PCICFG,
				AR5K_PCICFG_SLEEP_CLOCK_RATE, 0x03);
		}

		/* Enable sleep clock operation */
		AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG,
				AR5K_PCICFG_SLEEP_CLOCK_EN);

	} else {

		/* Disable sleep clock operation and
		 * restore default parameters */
		AR5K_REG_DISABLE_BITS(ah, AR5K_PCICFG,
				AR5K_PCICFG_SLEEP_CLOCK_EN);

		AR5K_REG_WRITE_BITS(ah, AR5K_PCICFG,
				AR5K_PCICFG_SLEEP_CLOCK_RATE, 0);

		/* Set DAC/ADC delays */
		ath5k_hw_reg_write(ah, 0x1f, AR5K_PHY_SCR);
		ath5k_hw_reg_write(ah, AR5K_PHY_SLMT_32MHZ, AR5K_PHY_SLMT);

		if (ah->ah_mac_version == (AR5K_SREV_AR2417 >> 4))
			scal = AR5K_PHY_SCAL_32MHZ_2417;
		else if (ee->ee_is_hb63)
			scal = AR5K_PHY_SCAL_32MHZ_HB63;
		else
			scal = AR5K_PHY_SCAL_32MHZ;
		ath5k_hw_reg_write(ah, scal, AR5K_PHY_SCAL);

		ath5k_hw_reg_write(ah, AR5K_PHY_SCLOCK_32MHZ, AR5K_PHY_SCLOCK);
		ath5k_hw_reg_write(ah, AR5K_PHY_SDELAY_32MHZ, AR5K_PHY_SDELAY);

		if ((ah->ah_radio == AR5K_RF5112) ||
		(ah->ah_radio == AR5K_RF5413) ||
		(ah->ah_mac_version == (AR5K_SREV_AR2417 >> 4)))
			spending = 0x14;
		else
			spending = 0x18;
		ath5k_hw_reg_write(ah, spending, AR5K_PHY_SPENDING);

		/* Set up tsf increment on each cycle */
		AR5K_REG_WRITE_BITS(ah, AR5K_TSF_PARM, AR5K_TSF_PARM_INC, 1);
	}
}


/*********************\
* Reset/Sleep control *
\*********************/

/*
 * Reset chipset
 */
static int ath5k_hw_nic_reset(struct ath5k_hw *ah, u32 val)
{
	int ret;
	u32 mask = val ? val : ~0U;

	/* Read-and-clear RX Descriptor Pointer*/
	ath5k_hw_reg_read(ah, AR5K_RXDP);

	/*
	 * Reset the device and wait until success
	 */
	ath5k_hw_reg_write(ah, val, AR5K_RESET_CTL);

	/* Wait at least 128 PCI clocks */
	udelay(15);

	if (ah->ah_version == AR5K_AR5210) {
		val &= AR5K_RESET_CTL_PCU | AR5K_RESET_CTL_DMA
			| AR5K_RESET_CTL_MAC | AR5K_RESET_CTL_PHY;
		mask &= AR5K_RESET_CTL_PCU | AR5K_RESET_CTL_DMA
			| AR5K_RESET_CTL_MAC | AR5K_RESET_CTL_PHY;
	} else {
		val &= AR5K_RESET_CTL_PCU | AR5K_RESET_CTL_BASEBAND;
		mask &= AR5K_RESET_CTL_PCU | AR5K_RESET_CTL_BASEBAND;
	}

	ret = ath5k_hw_register_timeout(ah, AR5K_RESET_CTL, mask, val, false);

	/*
	 * Reset configuration register (for hw byte-swap). Note that this
	 * is only set for big endian. We do the necessary magic in
	 * AR5K_INIT_CFG.
	 */
	if ((val & AR5K_RESET_CTL_PCU) == 0)
		ath5k_hw_reg_write(ah, AR5K_INIT_CFG, AR5K_CFG);

	return ret;
}

/*
 * Sleep control
 */
static int ath5k_hw_set_power(struct ath5k_hw *ah, enum ath5k_power_mode mode,
			      bool set_chip, u16 sleep_duration)
{
	unsigned int i;
	u32 staid, data;

	staid = ath5k_hw_reg_read(ah, AR5K_STA_ID1);

	switch (mode) {
	case AR5K_PM_AUTO:
		staid &= ~AR5K_STA_ID1_DEFAULT_ANTENNA;
		/* fallthrough */
	case AR5K_PM_NETWORK_SLEEP:
		if (set_chip)
			ath5k_hw_reg_write(ah,
				AR5K_SLEEP_CTL_SLE_ALLOW |
				sleep_duration,
				AR5K_SLEEP_CTL);

		staid |= AR5K_STA_ID1_PWR_SV;
		break;

	case AR5K_PM_FULL_SLEEP:
		if (set_chip)
			ath5k_hw_reg_write(ah, AR5K_SLEEP_CTL_SLE_SLP,
				AR5K_SLEEP_CTL);

		staid |= AR5K_STA_ID1_PWR_SV;
		break;

	case AR5K_PM_AWAKE:

		staid &= ~AR5K_STA_ID1_PWR_SV;

		if (!set_chip)
			goto commit;

		data = ath5k_hw_reg_read(ah, AR5K_SLEEP_CTL);

		/* If card is down we 'll get 0xffff... so we
		 * need to clean this up before we write the register
		 */
		if (data & 0xffc00000)
			data = 0;
		else
			/* Preserve sleep duration etc */
			data = data & ~AR5K_SLEEP_CTL_SLE;

		ath5k_hw_reg_write(ah, data | AR5K_SLEEP_CTL_SLE_WAKE,
							AR5K_SLEEP_CTL);
		udelay(15);

		for (i = 200; i > 0; i--) {
			/* Check if the chip did wake up */
			if ((ath5k_hw_reg_read(ah, AR5K_PCICFG) &
					AR5K_PCICFG_SPWR_DN) == 0)
				break;

			/* Wait a bit and retry */
			udelay(50);
			ath5k_hw_reg_write(ah, data | AR5K_SLEEP_CTL_SLE_WAKE,
							AR5K_SLEEP_CTL);
		}

		/* Fail if the chip didn't wake up */
		if (i == 0)
			return -EIO;

		break;

	default:
		return -EINVAL;
	}

commit:
	ath5k_hw_reg_write(ah, staid, AR5K_STA_ID1);

	return 0;
}

/*
 * Put device on hold
 *
 * Put MAC and Baseband on warm reset and
 * keep that state (don't clean sleep control
 * register). After this MAC and Baseband are
 * disabled and a full reset is needed to come
 * back. This way we save as much power as possible
 * without putting the card on full sleep.
 */
int ath5k_hw_on_hold(struct ath5k_hw *ah)
{
	struct pci_dev *pdev = ah->ah_sc->pdev;
	u32 bus_flags;
	int ret;

	/* Make sure device is awake */
	ret = ath5k_hw_set_power(ah, AR5K_PM_AWAKE, true, 0);
	if (ret) {
		ATH5K_ERR(ah->ah_sc, "failed to wakeup the MAC Chip\n");
		return ret;
	}

	/*
	 * Put chipset on warm reset...
	 *
	 * Note: putting PCI core on warm reset on PCI-E cards
	 * results card to hang and always return 0xffff... so
	 * we ingore that flag for PCI-E cards. On PCI cards
	 * this flag gets cleared after 64 PCI clocks.
	 */
	bus_flags = (pdev->is_pcie) ? 0 : AR5K_RESET_CTL_PCI;

	if (ah->ah_version == AR5K_AR5210) {
		ret = ath5k_hw_nic_reset(ah, AR5K_RESET_CTL_PCU |
			AR5K_RESET_CTL_MAC | AR5K_RESET_CTL_DMA |
			AR5K_RESET_CTL_PHY | AR5K_RESET_CTL_PCI);
			mdelay(2);
	} else {
		ret = ath5k_hw_nic_reset(ah, AR5K_RESET_CTL_PCU |
			AR5K_RESET_CTL_BASEBAND | bus_flags);
	}

	if (ret) {
		ATH5K_ERR(ah->ah_sc, "failed to put device on warm reset\n");
		return -EIO;
	}

	/* ...wakeup again!*/
	ret = ath5k_hw_set_power(ah, AR5K_PM_AWAKE, true, 0);
	if (ret) {
		ATH5K_ERR(ah->ah_sc, "failed to put device on hold\n");
		return ret;
	}

	return ret;
}

/*
 * Bring up MAC + PHY Chips and program PLL
 * TODO: Half/Quarter rate support
 */
int ath5k_hw_nic_wakeup(struct ath5k_hw *ah, int flags, bool initial)
{
	struct pci_dev *pdev = ah->ah_sc->pdev;
	u32 turbo, mode, clock, bus_flags;
	int ret;

	turbo = 0;
	mode = 0;
	clock = 0;

	/* Wakeup the device */
	ret = ath5k_hw_set_power(ah, AR5K_PM_AWAKE, true, 0);
	if (ret) {
		ATH5K_ERR(ah->ah_sc, "failed to wakeup the MAC Chip\n");
		return ret;
	}

	/*
	 * Put chipset on warm reset...
	 *
	 * Note: putting PCI core on warm reset on PCI-E cards
	 * results card to hang and always return 0xffff... so
	 * we ingore that flag for PCI-E cards. On PCI cards
	 * this flag gets cleared after 64 PCI clocks.
	 */
	bus_flags = (pdev->is_pcie) ? 0 : AR5K_RESET_CTL_PCI;

	if (ah->ah_version == AR5K_AR5210) {
		ret = ath5k_hw_nic_reset(ah, AR5K_RESET_CTL_PCU |
			AR5K_RESET_CTL_MAC | AR5K_RESET_CTL_DMA |
			AR5K_RESET_CTL_PHY | AR5K_RESET_CTL_PCI);
			mdelay(2);
	} else {
		ret = ath5k_hw_nic_reset(ah, AR5K_RESET_CTL_PCU |
			AR5K_RESET_CTL_BASEBAND | bus_flags);
	}

	if (ret) {
		ATH5K_ERR(ah->ah_sc, "failed to reset the MAC Chip\n");
		return -EIO;
	}

	/* ...wakeup again!...*/
	ret = ath5k_hw_set_power(ah, AR5K_PM_AWAKE, true, 0);
	if (ret) {
		ATH5K_ERR(ah->ah_sc, "failed to resume the MAC Chip\n");
		return ret;
	}

	/* ...clear reset control register and pull device out of
	 * warm reset */
	if (ath5k_hw_nic_reset(ah, 0)) {
		ATH5K_ERR(ah->ah_sc, "failed to warm reset the MAC Chip\n");
		return -EIO;
	}

	/* On initialization skip PLL programming since we don't have
	 * a channel / mode set yet */
	if (initial)
		return 0;

	if (ah->ah_version != AR5K_AR5210) {
		/*
		 * Get channel mode flags
		 */

		if (ah->ah_radio >= AR5K_RF5112) {
			mode = AR5K_PHY_MODE_RAD_RF5112;
			clock = AR5K_PHY_PLL_RF5112;
		} else {
			mode = AR5K_PHY_MODE_RAD_RF5111;	/*Zero*/
			clock = AR5K_PHY_PLL_RF5111;		/*Zero*/
		}

		if (flags & CHANNEL_2GHZ) {
			mode |= AR5K_PHY_MODE_FREQ_2GHZ;
			clock |= AR5K_PHY_PLL_44MHZ;

			if (flags & CHANNEL_CCK) {
				mode |= AR5K_PHY_MODE_MOD_CCK;
			} else if (flags & CHANNEL_OFDM) {
				/* XXX Dynamic OFDM/CCK is not supported by the
				 * AR5211 so we set MOD_OFDM for plain g (no
				 * CCK headers) operation. We need to test
				 * this, 5211 might support ofdm-only g after
				 * all, there are also initial register values
				 * in the code for g mode (see initvals.c). */
				if (ah->ah_version == AR5K_AR5211)
					mode |= AR5K_PHY_MODE_MOD_OFDM;
				else
					mode |= AR5K_PHY_MODE_MOD_DYN;
			} else {
				ATH5K_ERR(ah->ah_sc,
					"invalid radio modulation mode\n");
				return -EINVAL;
			}
		} else if (flags & CHANNEL_5GHZ) {
			mode |= AR5K_PHY_MODE_FREQ_5GHZ;

			if (ah->ah_radio == AR5K_RF5413)
				clock = AR5K_PHY_PLL_40MHZ_5413;
			else
				clock |= AR5K_PHY_PLL_40MHZ;

			if (flags & CHANNEL_OFDM)
				mode |= AR5K_PHY_MODE_MOD_OFDM;
			else {
				ATH5K_ERR(ah->ah_sc,
					"invalid radio modulation mode\n");
				return -EINVAL;
			}
		} else {
			ATH5K_ERR(ah->ah_sc, "invalid radio frequency mode\n");
			return -EINVAL;
		}

		if (flags & CHANNEL_TURBO)
			turbo = AR5K_PHY_TURBO_MODE | AR5K_PHY_TURBO_SHORT;
	} else { /* Reset the device */

		/* ...enable Atheros turbo mode if requested */
		if (flags & CHANNEL_TURBO)
			ath5k_hw_reg_write(ah, AR5K_PHY_TURBO_MODE,
					AR5K_PHY_TURBO);
	}

	if (ah->ah_version != AR5K_AR5210) {

		/* ...update PLL if needed */
		if (ath5k_hw_reg_read(ah, AR5K_PHY_PLL) != clock) {
			ath5k_hw_reg_write(ah, clock, AR5K_PHY_PLL);
			udelay(300);
		}

		/* ...set the PHY operating mode */
		ath5k_hw_reg_write(ah, mode, AR5K_PHY_MODE);
		ath5k_hw_reg_write(ah, turbo, AR5K_PHY_TURBO);
	}

	return 0;
}


/**************************************\
* Post-initvals register modifications *
\**************************************/

/* TODO: Half/Quarter rate */
static void ath5k_hw_tweak_initval_settings(struct ath5k_hw *ah,
				struct ieee80211_channel *channel)
{
	if (ah->ah_version == AR5K_AR5212 &&
	    ah->ah_phy_revision >= AR5K_SREV_PHY_5212A) {

		/* Setup ADC control */
		ath5k_hw_reg_write(ah,
				(AR5K_REG_SM(2,
				AR5K_PHY_ADC_CTL_INBUFGAIN_OFF) |
				AR5K_REG_SM(2,
				AR5K_PHY_ADC_CTL_INBUFGAIN_ON) |
				AR5K_PHY_ADC_CTL_PWD_DAC_OFF |
				AR5K_PHY_ADC_CTL_PWD_ADC_OFF),
				AR5K_PHY_ADC_CTL);



		/* Disable barker RSSI threshold */
		AR5K_REG_DISABLE_BITS(ah, AR5K_PHY_DAG_CCK_CTL,
				AR5K_PHY_DAG_CCK_CTL_EN_RSSI_THR);

		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_DAG_CCK_CTL,
			AR5K_PHY_DAG_CCK_CTL_RSSI_THR, 2);

		/* Set the mute mask */
		ath5k_hw_reg_write(ah, 0x0000000f, AR5K_SEQ_MASK);
	}

	/* Clear PHY_BLUETOOTH to allow RX_CLEAR line debug */
	if (ah->ah_phy_revision >= AR5K_SREV_PHY_5212B)
		ath5k_hw_reg_write(ah, 0, AR5K_PHY_BLUETOOTH);

	/* Enable DCU double buffering */
	if (ah->ah_phy_revision > AR5K_SREV_PHY_5212B)
		AR5K_REG_DISABLE_BITS(ah, AR5K_TXCFG,
				AR5K_TXCFG_DCU_DBL_BUF_DIS);

	/* Set DAC/ADC delays */
	if (ah->ah_version == AR5K_AR5212) {
		u32 scal;
		struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
		if (ah->ah_mac_version == (AR5K_SREV_AR2417 >> 4))
			scal = AR5K_PHY_SCAL_32MHZ_2417;
		else if (ee->ee_is_hb63)
			scal = AR5K_PHY_SCAL_32MHZ_HB63;
		else
			scal = AR5K_PHY_SCAL_32MHZ;
		ath5k_hw_reg_write(ah, scal, AR5K_PHY_SCAL);
	}

	/* Set fast ADC */
	if ((ah->ah_radio == AR5K_RF5413) ||
	(ah->ah_mac_version == (AR5K_SREV_AR2417 >> 4))) {
		u32 fast_adc = true;

		if (channel->center_freq == 2462 ||
		channel->center_freq == 2467)
			fast_adc = 0;

		/* Only update if needed */
		if (ath5k_hw_reg_read(ah, AR5K_PHY_FAST_ADC) != fast_adc)
				ath5k_hw_reg_write(ah, fast_adc,
						AR5K_PHY_FAST_ADC);
	}

	/* Fix for first revision of the RF5112 RF chipset */
	if (ah->ah_radio == AR5K_RF5112 &&
			ah->ah_radio_5ghz_revision <
			AR5K_SREV_RAD_5112A) {
		u32 data;
		ath5k_hw_reg_write(ah, AR5K_PHY_CCKTXCTL_WORLD,
				AR5K_PHY_CCKTXCTL);
		if (channel->hw_value & CHANNEL_5GHZ)
			data = 0xffb81020;
		else
			data = 0xffb80d20;
		ath5k_hw_reg_write(ah, data, AR5K_PHY_FRAME_CTL);
	}

	if (ah->ah_mac_srev < AR5K_SREV_AR5211) {
		/* Clear QCU/DCU clock gating register */
		ath5k_hw_reg_write(ah, 0, AR5K_QCUDCU_CLKGT);
		/* Set DAC/ADC delays */
		ath5k_hw_reg_write(ah, AR5K_PHY_SCAL_32MHZ_5311,
						AR5K_PHY_SCAL);
		/* Enable PCU FIFO corruption ECO */
		AR5K_REG_ENABLE_BITS(ah, AR5K_DIAG_SW_5211,
					AR5K_DIAG_SW_ECO_ENABLE);
	}
}

static void ath5k_hw_commit_eeprom_settings(struct ath5k_hw *ah,
		struct ieee80211_channel *channel, u8 ee_mode)
{
	struct ath5k_eeprom_info *ee = &ah->ah_capabilities.cap_eeprom;
	s16 cck_ofdm_pwr_delta;

	/* TODO: Add support for AR5210 EEPROM */
	if (ah->ah_version == AR5K_AR5210)
		return;

	/* Adjust power delta for channel 14 */
	if (channel->center_freq == 2484)
		cck_ofdm_pwr_delta =
			((ee->ee_cck_ofdm_power_delta -
			ee->ee_scaled_cck_delta) * 2) / 10;
	else
		cck_ofdm_pwr_delta =
			(ee->ee_cck_ofdm_power_delta * 2) / 10;

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

	/* XXX: necessary here? is called from ath5k_hw_set_antenna_mode()
	 * too */
	ath5k_hw_set_antenna_switch(ah, ee_mode);

	/* Noise floor threshold */
	ath5k_hw_reg_write(ah,
		AR5K_PHY_NF_SVAL(ee->ee_noise_floor_thr[ee_mode]),
		AR5K_PHY_NFTHRES);

	if ((channel->hw_value & CHANNEL_TURBO) &&
	(ah->ah_ee_version >= AR5K_EEPROM_VERSION_5_0)) {
		/* Switch settling time (Turbo) */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_SETTLING,
				AR5K_PHY_SETTLING_SWITCH,
				ee->ee_switch_settling_turbo[ee_mode]);

		/* Tx/Rx attenuation (Turbo) */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_GAIN,
				AR5K_PHY_GAIN_TXRX_ATTEN,
				ee->ee_atn_tx_rx_turbo[ee_mode]);

		/* ADC/PGA desired size (Turbo) */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_DESIRED_SIZE,
				AR5K_PHY_DESIRED_SIZE_ADC,
				ee->ee_adc_desired_size_turbo[ee_mode]);

		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_DESIRED_SIZE,
				AR5K_PHY_DESIRED_SIZE_PGA,
				ee->ee_pga_desired_size_turbo[ee_mode]);

		/* Tx/Rx margin (Turbo) */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_GAIN_2GHZ,
				AR5K_PHY_GAIN_2GHZ_MARGIN_TXRX,
				ee->ee_margin_tx_rx_turbo[ee_mode]);

	} else {
		/* Switch settling time */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_SETTLING,
				AR5K_PHY_SETTLING_SWITCH,
				ee->ee_switch_settling[ee_mode]);

		/* Tx/Rx attenuation */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_GAIN,
				AR5K_PHY_GAIN_TXRX_ATTEN,
				ee->ee_atn_tx_rx[ee_mode]);

		/* ADC/PGA desired size */
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_DESIRED_SIZE,
				AR5K_PHY_DESIRED_SIZE_ADC,
				ee->ee_adc_desired_size[ee_mode]);

		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_DESIRED_SIZE,
				AR5K_PHY_DESIRED_SIZE_PGA,
				ee->ee_pga_desired_size[ee_mode]);

		/* Tx/Rx margin */
		if (ah->ah_ee_version >= AR5K_EEPROM_VERSION_4_1)
			AR5K_REG_WRITE_BITS(ah, AR5K_PHY_GAIN_2GHZ,
				AR5K_PHY_GAIN_2GHZ_MARGIN_TXRX,
				ee->ee_margin_tx_rx[ee_mode]);
	}

	/* XPA delays */
	ath5k_hw_reg_write(ah,
		(ee->ee_tx_end2xpa_disable[ee_mode] << 24) |
		(ee->ee_tx_end2xpa_disable[ee_mode] << 16) |
		(ee->ee_tx_frm2xpa_enable[ee_mode] << 8) |
		(ee->ee_tx_frm2xpa_enable[ee_mode]), AR5K_PHY_RF_CTL4);

	/* XLNA delay */
	AR5K_REG_WRITE_BITS(ah, AR5K_PHY_RF_CTL3,
			AR5K_PHY_RF_CTL3_TXE2XLNA_ON,
			ee->ee_tx_end2xlna_enable[ee_mode]);

	/* Thresh64 (ANI) */
	AR5K_REG_WRITE_BITS(ah, AR5K_PHY_NF,
			AR5K_PHY_NF_THRESH62,
			ee->ee_thr_62[ee_mode]);

	/* False detect backoff for channels
	 * that have spur noise. Write the new
	 * cyclic power RSSI threshold. */
	if (ath5k_hw_chan_has_spur_noise(ah, channel))
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_OFDM_SELFCORR,
				AR5K_PHY_OFDM_SELFCORR_CYPWR_THR1,
				AR5K_INIT_CYCRSSI_THR1 +
				ee->ee_false_detect[ee_mode]);
	else
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_OFDM_SELFCORR,
				AR5K_PHY_OFDM_SELFCORR_CYPWR_THR1,
				AR5K_INIT_CYCRSSI_THR1);

	/* I/Q correction (set enable bit last to match HAL sources) */
	/* TODO: Per channel i/q infos ? */
	if (ah->ah_ee_version >= AR5K_EEPROM_VERSION_4_0) {
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_IQ, AR5K_PHY_IQ_CORR_Q_I_COFF,
			    ee->ee_i_cal[ee_mode]);
		AR5K_REG_WRITE_BITS(ah, AR5K_PHY_IQ, AR5K_PHY_IQ_CORR_Q_Q_COFF,
			    ee->ee_q_cal[ee_mode]);
		AR5K_REG_ENABLE_BITS(ah, AR5K_PHY_IQ, AR5K_PHY_IQ_CORR_ENABLE);
	}

	/* Heavy clipping -disable for now */
	if (ah->ah_ee_version >= AR5K_EEPROM_VERSION_5_1)
		ath5k_hw_reg_write(ah, 0, AR5K_PHY_HEAVY_CLIP_ENABLE);
}


/*********************\
* Main reset function *
\*********************/

int ath5k_hw_reset(struct ath5k_hw *ah, enum nl80211_iftype op_mode,
	struct ieee80211_channel *channel, bool change_channel)
{
	struct ath_common *common = ath5k_hw_common(ah);
	u32 s_seq[10], s_led[3], staid1_flags, tsf_up, tsf_lo;
	u8 mode, freq, ee_mode;
	int i, ret;

	ee_mode = 0;
	staid1_flags = 0;
	tsf_up = 0;
	tsf_lo = 0;
	freq = 0;
	mode = 0;


	/*
	 * Stop PCU
	 */
	ath5k_hw_stop_rx_pcu(ah);

	/*
	 * Stop DMA
	 *
	 * Note: If DMA didn't stop continue
	 * since only a reset will fix it.
	 */
	ath5k_hw_dma_stop(ah);

	/*
	 * Save some registers before a reset
	 */
	/*DCU/Antenna selection not available on 5210*/
	if (ah->ah_version != AR5K_AR5210) {

		switch (channel->hw_value & CHANNEL_MODES) {
		case CHANNEL_A:
			mode = AR5K_MODE_11A;
			freq = AR5K_INI_RFGAIN_5GHZ;
			ee_mode = AR5K_EEPROM_MODE_11A;
			break;
		case CHANNEL_G:
			mode = AR5K_MODE_11G;
			freq = AR5K_INI_RFGAIN_2GHZ;
			ee_mode = AR5K_EEPROM_MODE_11G;
			break;
		case CHANNEL_B:
			mode = AR5K_MODE_11B;
			freq = AR5K_INI_RFGAIN_2GHZ;
			ee_mode = AR5K_EEPROM_MODE_11B;
			break;
		case CHANNEL_T:
			mode = AR5K_MODE_11A_TURBO;
			freq = AR5K_INI_RFGAIN_5GHZ;
			ee_mode = AR5K_EEPROM_MODE_11A;
			break;
		case CHANNEL_TG:
			if (ah->ah_version == AR5K_AR5211) {
				ATH5K_ERR(ah->ah_sc,
					"TurboG mode not available on 5211");
				return -EINVAL;
			}
			mode = AR5K_MODE_11G_TURBO;
			freq = AR5K_INI_RFGAIN_2GHZ;
			ee_mode = AR5K_EEPROM_MODE_11G;
			break;
		case CHANNEL_XR:
			if (ah->ah_version == AR5K_AR5211) {
				ATH5K_ERR(ah->ah_sc,
					"XR mode not available on 5211");
				return -EINVAL;
			}
			mode = AR5K_MODE_XR;
			freq = AR5K_INI_RFGAIN_5GHZ;
			ee_mode = AR5K_EEPROM_MODE_11A;
			break;
		default:
			ATH5K_ERR(ah->ah_sc,
				"invalid channel: %d\n", channel->center_freq);
			return -EINVAL;
		}

		if (change_channel) {
			/*
			 * Save frame sequence count
			 * For revs. after Oahu, only save
			 * seq num for DCU 0 (Global seq num)
			 */
			if (ah->ah_mac_srev < AR5K_SREV_AR5211) {

				for (i = 0; i < 10; i++)
					s_seq[i] = ath5k_hw_reg_read(ah,
						AR5K_QUEUE_DCU_SEQNUM(i));

			} else {
				s_seq[0] = ath5k_hw_reg_read(ah,
						AR5K_QUEUE_DCU_SEQNUM(0));
			}

			/* TSF accelerates on AR5211 during reset
			 * As a workaround save it here and restore
			 * it later so that it's back in time after
			 * reset. This way it'll get re-synced on the
			 * next beacon without breaking ad-hoc.
			 *
			 * On AR5212 TSF is almost preserved across a
			 * reset so it stays back in time anyway and
			 * we don't have to save/restore it.
			 *
			 * XXX: Since this breaks power saving we have
			 * to disable power saving until we receive the
			 * next beacon, so we can resync beacon timers */
			if (ah->ah_version == AR5K_AR5211) {
				tsf_up = ath5k_hw_reg_read(ah, AR5K_TSF_U32);
				tsf_lo = ath5k_hw_reg_read(ah, AR5K_TSF_L32);
			}
		}

		if (ah->ah_version == AR5K_AR5212) {
			/* Restore normal 32/40MHz clock operation
			 * to avoid register access delay on certain
			 * PHY registers */
			ath5k_hw_set_sleep_clock(ah, false);

			/* Since we are going to write rf buffer
			 * check if we have any pending gain_F
			 * optimization settings */
			if (change_channel && ah->ah_rf_banks != NULL)
				ath5k_hw_gainf_calibrate(ah);
		}
	}

	/*GPIOs*/
	s_led[0] = ath5k_hw_reg_read(ah, AR5K_PCICFG) &
					AR5K_PCICFG_LEDSTATE;
	s_led[1] = ath5k_hw_reg_read(ah, AR5K_GPIOCR);
	s_led[2] = ath5k_hw_reg_read(ah, AR5K_GPIODO);

	/* AR5K_STA_ID1 flags, only preserve antenna
	 * settings and ack/cts rate mode */
	staid1_flags = ath5k_hw_reg_read(ah, AR5K_STA_ID1) &
			(AR5K_STA_ID1_DEFAULT_ANTENNA |
			AR5K_STA_ID1_DESC_ANTENNA |
			AR5K_STA_ID1_RTS_DEF_ANTENNA |
			AR5K_STA_ID1_ACKCTS_6MB |
			AR5K_STA_ID1_BASE_RATE_11B |
			AR5K_STA_ID1_SELFGEN_DEF_ANT);

	/* Wakeup the device */
	ret = ath5k_hw_nic_wakeup(ah, channel->hw_value, false);
	if (ret)
		return ret;

	/* PHY access enable */
	if (ah->ah_mac_srev >= AR5K_SREV_AR5211)
		ath5k_hw_reg_write(ah, AR5K_PHY_SHIFT_5GHZ, AR5K_PHY(0));
	else
		ath5k_hw_reg_write(ah, AR5K_PHY_SHIFT_5GHZ | 0x40,
							AR5K_PHY(0));

	/* Write initial settings */
	ret = ath5k_hw_write_initvals(ah, mode, change_channel);
	if (ret)
		return ret;

	/* Initialize core clock settings */
	ath5k_hw_init_core_clock(ah);

	/*
	 * Tweak initval settings for revised
	 * chipsets and add some more config
	 * bits
	 */
	ath5k_hw_tweak_initval_settings(ah, channel);

	/* Commit values from EEPROM */
	ath5k_hw_commit_eeprom_settings(ah, channel, ee_mode);


	/*
	 * Restore saved values
	 */

	/*DCU/Antenna selection not available on 5210*/
	if (ah->ah_version != AR5K_AR5210) {

		if (change_channel) {
			if (ah->ah_mac_srev < AR5K_SREV_AR5211) {
				for (i = 0; i < 10; i++)
					ath5k_hw_reg_write(ah, s_seq[i],
						AR5K_QUEUE_DCU_SEQNUM(i));
			} else {
				ath5k_hw_reg_write(ah, s_seq[0],
					AR5K_QUEUE_DCU_SEQNUM(0));
			}


			if (ah->ah_version == AR5K_AR5211) {
				ath5k_hw_reg_write(ah, tsf_up, AR5K_TSF_U32);
				ath5k_hw_reg_write(ah, tsf_lo, AR5K_TSF_L32);
			}
		}
	}

	/* Ledstate */
	AR5K_REG_ENABLE_BITS(ah, AR5K_PCICFG, s_led[0]);

	/* Gpio settings */
	ath5k_hw_reg_write(ah, s_led[1], AR5K_GPIOCR);
	ath5k_hw_reg_write(ah, s_led[2], AR5K_GPIODO);

	/* Restore sta_id flags and preserve our mac address*/
	ath5k_hw_reg_write(ah,
			   get_unaligned_le32(common->macaddr),
			   AR5K_STA_ID0);
	ath5k_hw_reg_write(ah,
			   staid1_flags | get_unaligned_le16(common->macaddr + 4),
			   AR5K_STA_ID1);


	/*
	 * Initialize PCU
	 */
	ath5k_hw_pcu_init(ah, op_mode, mode);

	/*
	 * Initialize PHY
	 */
	ret = ath5k_hw_phy_init(ah, channel, mode, ee_mode, freq);
	if (ret) {
		ATH5K_ERR(ah->ah_sc,
			"failed to initialize PHY (%i) !\n", ret);
		return ret;
	}

	/*
	 * Configure QCUs/DCUs
	 */
	ret = ath5k_hw_init_queues(ah);
	if (ret)
		return ret;


	/*
	 * Initialize DMA/Interrupts
	 */
	ath5k_hw_dma_init(ah);


	/* Enable 32KHz clock function for AR5212+ chips
	 * Set clocks to 32KHz operation and use an
	 * external 32KHz crystal when sleeping if one
	 * exists */
	if (ah->ah_version == AR5K_AR5212 &&
	    op_mode != NL80211_IFTYPE_AP)
		ath5k_hw_set_sleep_clock(ah, true);

	/*
	 * Disable beacons and reset the TSF
	 */
	AR5K_REG_DISABLE_BITS(ah, AR5K_BEACON, AR5K_BEACON_ENABLE);
	ath5k_hw_reset_tsf(ah);
	return 0;
}