rt73usb.c

/*
	Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
	<http://rt2x00.serialmonkey.com>

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2 of the License, or
	(at your option) any later version.

	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.,
	59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

/*
	Module: rt73usb
	Abstract: rt73usb device specific routines.
	Supported chipsets: rt2571W & rt2671.
 */

#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>

#include "rt2x00.h"
#include "rt2x00usb.h"
#include "rt73usb.h"

/*
 * Register access.
 * All access to the CSR registers will go through the methods
 * rt73usb_register_read and rt73usb_register_write.
 * BBP and RF register require indirect register access,
 * and use the CSR registers BBPCSR and RFCSR to achieve this.
 * These indirect registers work with busy bits,
 * and we will try maximal REGISTER_BUSY_COUNT times to access
 * the register while taking a REGISTER_BUSY_DELAY us delay
 * between each attampt. When the busy bit is still set at that time,
 * the access attempt is considered to have failed,
 * and we will print an error.
 * The _lock versions must be used if you already hold the usb_cache_mutex
 */
static inline void rt73usb_register_read(struct rt2x00_dev *rt2x00dev,
					 const unsigned int offset, u32 *value)
{
	__le32 reg;
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
				      USB_VENDOR_REQUEST_IN, offset,
				      &reg, sizeof(u32), REGISTER_TIMEOUT);
	*value = le32_to_cpu(reg);
}

static inline void rt73usb_register_read_lock(struct rt2x00_dev *rt2x00dev,
					      const unsigned int offset, u32 *value)
{
	__le32 reg;
	rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_READ,
				       USB_VENDOR_REQUEST_IN, offset,
				       &reg, sizeof(u32), REGISTER_TIMEOUT);
	*value = le32_to_cpu(reg);
}

static inline void rt73usb_register_multiread(struct rt2x00_dev *rt2x00dev,
					      const unsigned int offset,
					      void *value, const u32 length)
{
	int timeout = REGISTER_TIMEOUT * (length / sizeof(u32));
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
				      USB_VENDOR_REQUEST_IN, offset,
				      value, length, timeout);
}

static inline void rt73usb_register_write(struct rt2x00_dev *rt2x00dev,
					  const unsigned int offset, u32 value)
{
	__le32 reg = cpu_to_le32(value);
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
				      USB_VENDOR_REQUEST_OUT, offset,
				      &reg, sizeof(u32), REGISTER_TIMEOUT);
}

static inline void rt73usb_register_write_lock(struct rt2x00_dev *rt2x00dev,
					       const unsigned int offset, u32 value)
{
	__le32 reg = cpu_to_le32(value);
	rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_WRITE,
				       USB_VENDOR_REQUEST_OUT, offset,
				      &reg, sizeof(u32), REGISTER_TIMEOUT);
}

static inline void rt73usb_register_multiwrite(struct rt2x00_dev *rt2x00dev,
					       const unsigned int offset,
					       void *value, const u32 length)
{
	int timeout = REGISTER_TIMEOUT * (length / sizeof(u32));
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
				      USB_VENDOR_REQUEST_OUT, offset,
				      value, length, timeout);
}

static u32 rt73usb_bbp_check(struct rt2x00_dev *rt2x00dev)
{
	u32 reg;
	unsigned int i;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		rt73usb_register_read_lock(rt2x00dev, PHY_CSR3, &reg);
		if (!rt2x00_get_field32(reg, PHY_CSR3_BUSY))
			break;
		udelay(REGISTER_BUSY_DELAY);
	}

	return reg;
}

static void rt73usb_bbp_write(struct rt2x00_dev *rt2x00dev,
			      const unsigned int word, const u8 value)
{
	u32 reg;

	mutex_lock(&rt2x00dev->usb_cache_mutex);

	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt73usb_bbp_check(rt2x00dev);
	if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
		ERROR(rt2x00dev, "PHY_CSR3 register busy. Write failed.\n");
		mutex_unlock(&rt2x00dev->usb_cache_mutex);
		return;
	}

	/*
	 * Write the data into the BBP.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, PHY_CSR3_VALUE, value);
	rt2x00_set_field32(&reg, PHY_CSR3_REGNUM, word);
	rt2x00_set_field32(&reg, PHY_CSR3_BUSY, 1);
	rt2x00_set_field32(&reg, PHY_CSR3_READ_CONTROL, 0);

	rt73usb_register_write_lock(rt2x00dev, PHY_CSR3, reg);
	mutex_unlock(&rt2x00dev->usb_cache_mutex);
}

static void rt73usb_bbp_read(struct rt2x00_dev *rt2x00dev,
			     const unsigned int word, u8 *value)
{
	u32 reg;

	mutex_lock(&rt2x00dev->usb_cache_mutex);

	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt73usb_bbp_check(rt2x00dev);
	if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
		ERROR(rt2x00dev, "PHY_CSR3 register busy. Read failed.\n");
		mutex_unlock(&rt2x00dev->usb_cache_mutex);
		return;
	}

	/*
	 * Write the request into the BBP.
	 */
	reg = 0;
	rt2x00_set_field32(&reg, PHY_CSR3_REGNUM, word);
	rt2x00_set_field32(&reg, PHY_CSR3_BUSY, 1);
	rt2x00_set_field32(&reg, PHY_CSR3_READ_CONTROL, 1);

	rt73usb_register_write_lock(rt2x00dev, PHY_CSR3, reg);

	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt73usb_bbp_check(rt2x00dev);
	if (rt2x00_get_field32(reg, PHY_CSR3_BUSY)) {
		ERROR(rt2x00dev, "PHY_CSR3 register busy. Read failed.\n");
		*value = 0xff;
		return;
	}

	*value = rt2x00_get_field32(reg, PHY_CSR3_VALUE);
	mutex_unlock(&rt2x00dev->usb_cache_mutex);
}

static void rt73usb_rf_write(struct rt2x00_dev *rt2x00dev,
			     const unsigned int word, const u32 value)
{
	u32 reg;
	unsigned int i;

	if (!word)
		return;

	mutex_lock(&rt2x00dev->usb_cache_mutex);

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		rt73usb_register_read_lock(rt2x00dev, PHY_CSR4, &reg);
		if (!rt2x00_get_field32(reg, PHY_CSR4_BUSY))
			goto rf_write;
		udelay(REGISTER_BUSY_DELAY);
	}

	mutex_unlock(&rt2x00dev->usb_cache_mutex);
	ERROR(rt2x00dev, "PHY_CSR4 register busy. Write failed.\n");
	return;

rf_write:
	reg = 0;
	rt2x00_set_field32(&reg, PHY_CSR4_VALUE, value);

	/*
	 * RF5225 and RF2527 contain 21 bits per RF register value,
	 * all others contain 20 bits.
	 */
	rt2x00_set_field32(&reg, PHY_CSR4_NUMBER_OF_BITS,
			   20 + (rt2x00_rf(&rt2x00dev->chip, RF5225) ||
				 rt2x00_rf(&rt2x00dev->chip, RF2527)));
	rt2x00_set_field32(&reg, PHY_CSR4_IF_SELECT, 0);
	rt2x00_set_field32(&reg, PHY_CSR4_BUSY, 1);

	rt73usb_register_write_lock(rt2x00dev, PHY_CSR4, reg);
	rt2x00_rf_write(rt2x00dev, word, value);
	mutex_unlock(&rt2x00dev->usb_cache_mutex);
}

#ifdef CONFIG_RT2X00_LIB_DEBUGFS
#define CSR_OFFSET(__word)	( CSR_REG_BASE + ((__word) * sizeof(u32)) )

static void rt73usb_read_csr(struct rt2x00_dev *rt2x00dev,
			     const unsigned int word, u32 *data)
{
	rt73usb_register_read(rt2x00dev, CSR_OFFSET(word), data);
}

static void rt73usb_write_csr(struct rt2x00_dev *rt2x00dev,
			      const unsigned int word, u32 data)
{
	rt73usb_register_write(rt2x00dev, CSR_OFFSET(word), data);
}

static const struct rt2x00debug rt73usb_rt2x00debug = {
	.owner	= THIS_MODULE,
	.csr	= {
		.read		= rt73usb_read_csr,
		.write		= rt73usb_write_csr,
		.word_size	= sizeof(u32),
		.word_count	= CSR_REG_SIZE / sizeof(u32),
	},
	.eeprom	= {
		.read		= rt2x00_eeprom_read,
		.write		= rt2x00_eeprom_write,
		.word_size	= sizeof(u16),
		.word_count	= EEPROM_SIZE / sizeof(u16),
	},
	.bbp	= {
		.read		= rt73usb_bbp_read,
		.write		= rt73usb_bbp_write,
		.word_size	= sizeof(u8),
		.word_count	= BBP_SIZE / sizeof(u8),
	},
	.rf	= {
		.read		= rt2x00_rf_read,
		.write		= rt73usb_rf_write,
		.word_size	= sizeof(u32),
		.word_count	= RF_SIZE / sizeof(u32),
	},
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

/*
 * Configuration handlers.
 */
static void rt73usb_config_mac_addr(struct rt2x00_dev *rt2x00dev, __le32 *mac)
{
	u32 tmp;

	tmp = le32_to_cpu(mac[1]);
	rt2x00_set_field32(&tmp, MAC_CSR3_UNICAST_TO_ME_MASK, 0xff);
	mac[1] = cpu_to_le32(tmp);

	rt73usb_register_multiwrite(rt2x00dev, MAC_CSR2, mac,
				    (2 * sizeof(__le32)));
}

static void rt73usb_config_bssid(struct rt2x00_dev *rt2x00dev, __le32 *bssid)
{
	u32 tmp;

	tmp = le32_to_cpu(bssid[1]);
	rt2x00_set_field32(&tmp, MAC_CSR5_BSS_ID_MASK, 3);
	bssid[1] = cpu_to_le32(tmp);

	rt73usb_register_multiwrite(rt2x00dev, MAC_CSR4, bssid,
				    (2 * sizeof(__le32)));
}

static void rt73usb_config_type(struct rt2x00_dev *rt2x00dev, const int type,
				const int tsf_sync)
{
	u32 reg;

	/*
	 * Clear current synchronisation setup.
	 * For the Beacon base registers we only need to clear
	 * the first byte since that byte contains the VALID and OWNER
	 * bits which (when set to 0) will invalidate the entire beacon.
	 */
	rt73usb_register_write(rt2x00dev, TXRX_CSR9, 0);
	rt73usb_register_write(rt2x00dev, HW_BEACON_BASE0, 0);
	rt73usb_register_write(rt2x00dev, HW_BEACON_BASE1, 0);
	rt73usb_register_write(rt2x00dev, HW_BEACON_BASE2, 0);
	rt73usb_register_write(rt2x00dev, HW_BEACON_BASE3, 0);

	/*
	 * Enable synchronisation.
	 */
	rt73usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR9_TSF_TICKING, 1);
	rt2x00_set_field32(&reg, TXRX_CSR9_TBTT_ENABLE,
			   (tsf_sync == TSF_SYNC_BEACON));
	rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_GEN, 0);
	rt2x00_set_field32(&reg, TXRX_CSR9_TSF_SYNC, tsf_sync);
	rt73usb_register_write(rt2x00dev, TXRX_CSR9, reg);
}

static void rt73usb_config_preamble(struct rt2x00_dev *rt2x00dev,
				      const int short_preamble,
				      const int ack_timeout,
				      const int ack_consume_time)
{
	u32 reg;

	/*
	 * When in atomic context, reschedule and let rt2x00lib
	 * call this function again.
	 */
	if (in_atomic()) {
		queue_work(rt2x00dev->hw->workqueue, &rt2x00dev->config_work);
		return;
	}

	rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR0_RX_ACK_TIMEOUT, ack_timeout);
	rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_PREAMBLE,
			   !!short_preamble);
	rt73usb_register_write(rt2x00dev, TXRX_CSR4, reg);
}

static void rt73usb_config_phymode(struct rt2x00_dev *rt2x00dev,
				   const int basic_rate_mask)
{
	rt73usb_register_write(rt2x00dev, TXRX_CSR5, basic_rate_mask);
}

static void rt73usb_config_channel(struct rt2x00_dev *rt2x00dev,
				   struct rf_channel *rf, const int txpower)
{
	u8 r3;
	u8 r94;
	u8 smart;

	rt2x00_set_field32(&rf->rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));
	rt2x00_set_field32(&rf->rf4, RF4_FREQ_OFFSET, rt2x00dev->freq_offset);

	smart = !(rt2x00_rf(&rt2x00dev->chip, RF5225) ||
		  rt2x00_rf(&rt2x00dev->chip, RF2527));

	rt73usb_bbp_read(rt2x00dev, 3, &r3);
	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, smart);
	rt73usb_bbp_write(rt2x00dev, 3, r3);

	r94 = 6;
	if (txpower > MAX_TXPOWER && txpower <= (MAX_TXPOWER + r94))
		r94 += txpower - MAX_TXPOWER;
	else if (txpower < MIN_TXPOWER && txpower >= (MIN_TXPOWER - r94))
		r94 += txpower;
	rt73usb_bbp_write(rt2x00dev, 94, r94);

	rt73usb_rf_write(rt2x00dev, 1, rf->rf1);
	rt73usb_rf_write(rt2x00dev, 2, rf->rf2);
	rt73usb_rf_write(rt2x00dev, 3, rf->rf3 & ~0x00000004);
	rt73usb_rf_write(rt2x00dev, 4, rf->rf4);

	rt73usb_rf_write(rt2x00dev, 1, rf->rf1);
	rt73usb_rf_write(rt2x00dev, 2, rf->rf2);
	rt73usb_rf_write(rt2x00dev, 3, rf->rf3 | 0x00000004);
	rt73usb_rf_write(rt2x00dev, 4, rf->rf4);

	rt73usb_rf_write(rt2x00dev, 1, rf->rf1);
	rt73usb_rf_write(rt2x00dev, 2, rf->rf2);
	rt73usb_rf_write(rt2x00dev, 3, rf->rf3 & ~0x00000004);
	rt73usb_rf_write(rt2x00dev, 4, rf->rf4);

	udelay(10);
}

static void rt73usb_config_txpower(struct rt2x00_dev *rt2x00dev,
				   const int txpower)
{
	struct rf_channel rf;

	rt2x00_rf_read(rt2x00dev, 1, &rf.rf1);
	rt2x00_rf_read(rt2x00dev, 2, &rf.rf2);
	rt2x00_rf_read(rt2x00dev, 3, &rf.rf3);
	rt2x00_rf_read(rt2x00dev, 4, &rf.rf4);

	rt73usb_config_channel(rt2x00dev, &rf, txpower);
}

static void rt73usb_config_antenna_5x(struct rt2x00_dev *rt2x00dev,
				      struct antenna_setup *ant)
{
	u8 r3;
	u8 r4;
	u8 r77;
	u8 temp;

	rt73usb_bbp_read(rt2x00dev, 3, &r3);
	rt73usb_bbp_read(rt2x00dev, 4, &r4);
	rt73usb_bbp_read(rt2x00dev, 77, &r77);

	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, 0);

	/*
	 * Configure the RX antenna.
	 */
	switch (ant->rx) {
	case ANTENNA_HW_DIVERSITY:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 2);
		temp = !test_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags)
		       && (rt2x00dev->curr_hwmode != HWMODE_A);
		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, temp);
		break;
	case ANTENNA_A:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
		if (rt2x00dev->curr_hwmode == HWMODE_A)
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		else
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		break;
	case ANTENNA_SW_DIVERSITY:
		/*
		 * NOTE: We should never come here because rt2x00lib is
		 * supposed to catch this and send us the correct antenna
		 * explicitely. However we are nog going to bug about this.
		 * Instead, just default to antenna B.
		 */
	case ANTENNA_B:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END, 0);
		if (rt2x00dev->curr_hwmode == HWMODE_A)
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		else
			rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		break;
	}

	rt73usb_bbp_write(rt2x00dev, 77, r77);
	rt73usb_bbp_write(rt2x00dev, 3, r3);
	rt73usb_bbp_write(rt2x00dev, 4, r4);
}

static void rt73usb_config_antenna_2x(struct rt2x00_dev *rt2x00dev,
				      struct antenna_setup *ant)
{
	u8 r3;
	u8 r4;
	u8 r77;

	rt73usb_bbp_read(rt2x00dev, 3, &r3);
	rt73usb_bbp_read(rt2x00dev, 4, &r4);
	rt73usb_bbp_read(rt2x00dev, 77, &r77);

	rt2x00_set_field8(&r3, BBP_R3_SMART_MODE, 0);
	rt2x00_set_field8(&r4, BBP_R4_RX_FRAME_END,
			  !test_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags));

	/*
	 * Configure the RX antenna.
	 */
	switch (ant->rx) {
	case ANTENNA_HW_DIVERSITY:
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 2);
		break;
	case ANTENNA_A:
		rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 3);
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		break;
	case ANTENNA_SW_DIVERSITY:
		/*
		 * NOTE: We should never come here because rt2x00lib is
		 * supposed to catch this and send us the correct antenna
		 * explicitely. However we are nog going to bug about this.
		 * Instead, just default to antenna B.
		 */
	case ANTENNA_B:
		rt2x00_set_field8(&r77, BBP_R77_RX_ANTENNA, 0);
		rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA_CONTROL, 1);
		break;
	}

	rt73usb_bbp_write(rt2x00dev, 77, r77);
	rt73usb_bbp_write(rt2x00dev, 3, r3);
	rt73usb_bbp_write(rt2x00dev, 4, r4);
}

struct antenna_sel {
	u8 word;
	/*
	 * value[0] -> non-LNA
	 * value[1] -> LNA
	 */
	u8 value[2];
};

static const struct antenna_sel antenna_sel_a[] = {
	{ 96,  { 0x58, 0x78 } },
	{ 104, { 0x38, 0x48 } },
	{ 75,  { 0xfe, 0x80 } },
	{ 86,  { 0xfe, 0x80 } },
	{ 88,  { 0xfe, 0x80 } },
	{ 35,  { 0x60, 0x60 } },
	{ 97,  { 0x58, 0x58 } },
	{ 98,  { 0x58, 0x58 } },
};

static const struct antenna_sel antenna_sel_bg[] = {
	{ 96,  { 0x48, 0x68 } },
	{ 104, { 0x2c, 0x3c } },
	{ 75,  { 0xfe, 0x80 } },
	{ 86,  { 0xfe, 0x80 } },
	{ 88,  { 0xfe, 0x80 } },
	{ 35,  { 0x50, 0x50 } },
	{ 97,  { 0x48, 0x48 } },
	{ 98,  { 0x48, 0x48 } },
};

static void rt73usb_config_antenna(struct rt2x00_dev *rt2x00dev,
				   struct antenna_setup *ant)
{
	const struct antenna_sel *sel;
	unsigned int lna;
	unsigned int i;
	u32 reg;

	if (rt2x00dev->curr_hwmode == HWMODE_A) {
		sel = antenna_sel_a;
		lna = test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags);
	} else {
		sel = antenna_sel_bg;
		lna = test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags);
	}

	for (i = 0; i < ARRAY_SIZE(antenna_sel_a); i++)
		rt73usb_bbp_write(rt2x00dev, sel[i].word, sel[i].value[lna]);

	rt73usb_register_read(rt2x00dev, PHY_CSR0, &reg);

	rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_BG,
			   (rt2x00dev->curr_hwmode == HWMODE_B ||
			    rt2x00dev->curr_hwmode == HWMODE_G));
	rt2x00_set_field32(&reg, PHY_CSR0_PA_PE_A,
			   (rt2x00dev->curr_hwmode == HWMODE_A));

	rt73usb_register_write(rt2x00dev, PHY_CSR0, reg);

	if (rt2x00_rf(&rt2x00dev->chip, RF5226) ||
	    rt2x00_rf(&rt2x00dev->chip, RF5225))
		rt73usb_config_antenna_5x(rt2x00dev, ant);
	else if (rt2x00_rf(&rt2x00dev->chip, RF2528) ||
		 rt2x00_rf(&rt2x00dev->chip, RF2527))
		rt73usb_config_antenna_2x(rt2x00dev, ant);
}

static void rt73usb_config_duration(struct rt2x00_dev *rt2x00dev,
				    struct rt2x00lib_conf *libconf)
{
	u32 reg;

	rt73usb_register_read(rt2x00dev, MAC_CSR9, &reg);
	rt2x00_set_field32(&reg, MAC_CSR9_SLOT_TIME, libconf->slot_time);
	rt73usb_register_write(rt2x00dev, MAC_CSR9, reg);

	rt73usb_register_read(rt2x00dev, MAC_CSR8, &reg);
	rt2x00_set_field32(&reg, MAC_CSR8_SIFS, libconf->sifs);
	rt2x00_set_field32(&reg, MAC_CSR8_SIFS_AFTER_RX_OFDM, 3);
	rt2x00_set_field32(&reg, MAC_CSR8_EIFS, libconf->eifs);
	rt73usb_register_write(rt2x00dev, MAC_CSR8, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR0_TSF_OFFSET, IEEE80211_HEADER);
	rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR4, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR4_AUTORESPOND_ENABLE, 1);
	rt73usb_register_write(rt2x00dev, TXRX_CSR4, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR9, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR9_BEACON_INTERVAL,
			   libconf->conf->beacon_int * 16);
	rt73usb_register_write(rt2x00dev, TXRX_CSR9, reg);
}

static void rt73usb_config(struct rt2x00_dev *rt2x00dev,
			   const unsigned int flags,
			   struct rt2x00lib_conf *libconf)
{
	if (flags & CONFIG_UPDATE_PHYMODE)
		rt73usb_config_phymode(rt2x00dev, libconf->basic_rates);
	if (flags & CONFIG_UPDATE_CHANNEL)
		rt73usb_config_channel(rt2x00dev, &libconf->rf,
				       libconf->conf->power_level);
	if ((flags & CONFIG_UPDATE_TXPOWER) && !(flags & CONFIG_UPDATE_CHANNEL))
		rt73usb_config_txpower(rt2x00dev, libconf->conf->power_level);
	if (flags & CONFIG_UPDATE_ANTENNA)
		rt73usb_config_antenna(rt2x00dev, &libconf->ant);
	if (flags & (CONFIG_UPDATE_SLOT_TIME | CONFIG_UPDATE_BEACON_INT))
		rt73usb_config_duration(rt2x00dev, libconf);
}

/*
 * LED functions.
 */
static void rt73usb_enable_led(struct rt2x00_dev *rt2x00dev)
{
	u32 reg;

	rt73usb_register_read(rt2x00dev, MAC_CSR14, &reg);
	rt2x00_set_field32(&reg, MAC_CSR14_ON_PERIOD, 70);
	rt2x00_set_field32(&reg, MAC_CSR14_OFF_PERIOD, 30);
	rt73usb_register_write(rt2x00dev, MAC_CSR14, reg);

	rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_RADIO_STATUS, 1);
	rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LINK_A_STATUS,
			   (rt2x00dev->rx_status.phymode == MODE_IEEE80211A));
	rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LINK_BG_STATUS,
			   (rt2x00dev->rx_status.phymode != MODE_IEEE80211A));

	rt2x00usb_vendor_request_sw(rt2x00dev, USB_LED_CONTROL, 0x0000,
				    rt2x00dev->led_reg, REGISTER_TIMEOUT);
}

static void rt73usb_disable_led(struct rt2x00_dev *rt2x00dev)
{
	rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_RADIO_STATUS, 0);
	rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LINK_BG_STATUS, 0);
	rt2x00_set_field16(&rt2x00dev->led_reg, MCU_LEDCS_LINK_A_STATUS, 0);

	rt2x00usb_vendor_request_sw(rt2x00dev, USB_LED_CONTROL, 0x0000,
				    rt2x00dev->led_reg, REGISTER_TIMEOUT);
}

static void rt73usb_activity_led(struct rt2x00_dev *rt2x00dev, int rssi)
{
	u32 led;

	if (rt2x00dev->led_mode != LED_MODE_SIGNAL_STRENGTH)
		return;

	/*
	 * Led handling requires a positive value for the rssi,
	 * to do that correctly we need to add the correction.
	 */
	rssi += rt2x00dev->rssi_offset;

	if (rssi <= 30)
		led = 0;
	else if (rssi <= 39)
		led = 1;
	else if (rssi <= 49)
		led = 2;
	else if (rssi <= 53)
		led = 3;
	else if (rssi <= 63)
		led = 4;
	else
		led = 5;

	rt2x00usb_vendor_request_sw(rt2x00dev, USB_LED_CONTROL, led,
				    rt2x00dev->led_reg, REGISTER_TIMEOUT);
}

/*
 * Link tuning
 */
static void rt73usb_link_stats(struct rt2x00_dev *rt2x00dev,
			       struct link_qual *qual)
{
	u32 reg;

	/*
	 * Update FCS error count from register.
	 */
	rt73usb_register_read(rt2x00dev, STA_CSR0, &reg);
	qual->rx_failed = rt2x00_get_field32(reg, STA_CSR0_FCS_ERROR);

	/*
	 * Update False CCA count from register.
	 */
	rt73usb_register_read(rt2x00dev, STA_CSR1, &reg);
	qual->false_cca = rt2x00_get_field32(reg, STA_CSR1_FALSE_CCA_ERROR);
}

static void rt73usb_reset_tuner(struct rt2x00_dev *rt2x00dev)
{
	rt73usb_bbp_write(rt2x00dev, 17, 0x20);
	rt2x00dev->link.vgc_level = 0x20;
}

static void rt73usb_link_tuner(struct rt2x00_dev *rt2x00dev)
{
	int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
	u8 r17;
	u8 up_bound;
	u8 low_bound;

	/*
	 * Update Led strength
	 */
	rt73usb_activity_led(rt2x00dev, rssi);

	rt73usb_bbp_read(rt2x00dev, 17, &r17);

	/*
	 * Determine r17 bounds.
	 */
	if (rt2x00dev->rx_status.phymode == MODE_IEEE80211A) {
		low_bound = 0x28;
		up_bound = 0x48;

		if (test_bit(CONFIG_EXTERNAL_LNA_A, &rt2x00dev->flags)) {
			low_bound += 0x10;
			up_bound += 0x10;
		}
	} else {
		if (rssi > -82) {
			low_bound = 0x1c;
			up_bound = 0x40;
		} else if (rssi > -84) {
			low_bound = 0x1c;
			up_bound = 0x20;
		} else {
			low_bound = 0x1c;
			up_bound = 0x1c;
		}

		if (test_bit(CONFIG_EXTERNAL_LNA_BG, &rt2x00dev->flags)) {
			low_bound += 0x14;
			up_bound += 0x10;
		}
	}

	/*
	 * Special big-R17 for very short distance
	 */
	if (rssi > -35) {
		if (r17 != 0x60)
			rt73usb_bbp_write(rt2x00dev, 17, 0x60);
		return;
	}

	/*
	 * Special big-R17 for short distance
	 */
	if (rssi >= -58) {
		if (r17 != up_bound)
			rt73usb_bbp_write(rt2x00dev, 17, up_bound);
		return;
	}

	/*
	 * Special big-R17 for middle-short distance
	 */
	if (rssi >= -66) {
		low_bound += 0x10;
		if (r17 != low_bound)
			rt73usb_bbp_write(rt2x00dev, 17, low_bound);
		return;
	}

	/*
	 * Special mid-R17 for middle distance
	 */
	if (rssi >= -74) {
		if (r17 != (low_bound + 0x10))
			rt73usb_bbp_write(rt2x00dev, 17, low_bound + 0x08);
		return;
	}

	/*
	 * Special case: Change up_bound based on the rssi.
	 * Lower up_bound when rssi is weaker then -74 dBm.
	 */
	up_bound -= 2 * (-74 - rssi);
	if (low_bound > up_bound)
		up_bound = low_bound;

	if (r17 > up_bound) {
		rt73usb_bbp_write(rt2x00dev, 17, up_bound);
		return;
	}

	/*
	 * r17 does not yet exceed upper limit, continue and base
	 * the r17 tuning on the false CCA count.
	 */
	if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
		r17 += 4;
		if (r17 > up_bound)
			r17 = up_bound;
		rt73usb_bbp_write(rt2x00dev, 17, r17);
	} else if (rt2x00dev->link.qual.false_cca < 100 && r17 > low_bound) {
		r17 -= 4;
		if (r17 < low_bound)
			r17 = low_bound;
		rt73usb_bbp_write(rt2x00dev, 17, r17);
	}
}

/*
 * Firmware name function.
 */
static char *rt73usb_get_firmware_name(struct rt2x00_dev *rt2x00dev)
{
	return FIRMWARE_RT2571;
}

/*
 * Initialization functions.
 */
static int rt73usb_load_firmware(struct rt2x00_dev *rt2x00dev, void *data,
				 const size_t len)
{
	unsigned int i;
	int status;
	u32 reg;
	char *ptr = data;
	char *cache;
	int buflen;
	int timeout;

	/*
	 * Wait for stable hardware.
	 */
	for (i = 0; i < 100; i++) {
		rt73usb_register_read(rt2x00dev, MAC_CSR0, &reg);
		if (reg)
			break;
		msleep(1);
	}

	if (!reg) {
		ERROR(rt2x00dev, "Unstable hardware.\n");
		return -EBUSY;
	}

	/*
	 * Write firmware to device.
	 * We setup a seperate cache for this action,
	 * since we are going to write larger chunks of data
	 * then normally used cache size.
	 */
	cache = kmalloc(CSR_CACHE_SIZE_FIRMWARE, GFP_KERNEL);
	if (!cache) {
		ERROR(rt2x00dev, "Failed to allocate firmware cache.\n");
		return -ENOMEM;
	}

	for (i = 0; i < len; i += CSR_CACHE_SIZE_FIRMWARE) {
		buflen = min_t(int, len - i, CSR_CACHE_SIZE_FIRMWARE);
		timeout = REGISTER_TIMEOUT * (buflen / sizeof(u32));

		memcpy(cache, ptr, buflen);

		rt2x00usb_vendor_request(rt2x00dev, USB_MULTI_WRITE,
					 USB_VENDOR_REQUEST_OUT,
					 FIRMWARE_IMAGE_BASE + i, 0x0000,
					 cache, buflen, timeout);

		ptr += buflen;
	}

	kfree(cache);

	/*
	 * Send firmware request to device to load firmware,
	 * we need to specify a long timeout time.
	 */
	status = rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE,
					     0x0000, USB_MODE_FIRMWARE,
					     REGISTER_TIMEOUT_FIRMWARE);
	if (status < 0) {
		ERROR(rt2x00dev, "Failed to write Firmware to device.\n");
		return status;
	}

	rt73usb_disable_led(rt2x00dev);

	return 0;
}

static int rt73usb_init_registers(struct rt2x00_dev *rt2x00dev)
{
	u32 reg;

	rt73usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR0_AUTO_TX_SEQ, 1);
	rt2x00_set_field32(&reg, TXRX_CSR0_DISABLE_RX, 0);
	rt2x00_set_field32(&reg, TXRX_CSR0_TX_WITHOUT_WAITING, 0);
	rt73usb_register_write(rt2x00dev, TXRX_CSR0, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID0, 47); /* CCK Signal */
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID0_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID1, 30); /* Rssi */
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID1_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID2, 42); /* OFDM Rate */
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID2_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID3, 30); /* Rssi */
	rt2x00_set_field32(&reg, TXRX_CSR1_BBP_ID3_VALID, 1);
	rt73usb_register_write(rt2x00dev, TXRX_CSR1, reg);

	/*
	 * CCK TXD BBP registers
	 */
	rt73usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID0, 13);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID0_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID1, 12);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID1_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID2, 11);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID2_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID3, 10);
	rt2x00_set_field32(&reg, TXRX_CSR2_BBP_ID3_VALID, 1);
	rt73usb_register_write(rt2x00dev, TXRX_CSR2, reg);

	/*
	 * OFDM TXD BBP registers
	 */
	rt73usb_register_read(rt2x00dev, TXRX_CSR3, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID0, 7);
	rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID0_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID1, 6);
	rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID1_VALID, 1);
	rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID2, 5);
	rt2x00_set_field32(&reg, TXRX_CSR3_BBP_ID2_VALID, 1);
	rt73usb_register_write(rt2x00dev, TXRX_CSR3, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR7, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_6MBS, 59);
	rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_9MBS, 53);
	rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_12MBS, 49);
	rt2x00_set_field32(&reg, TXRX_CSR7_ACK_CTS_18MBS, 46);
	rt73usb_register_write(rt2x00dev, TXRX_CSR7, reg);

	rt73usb_register_read(rt2x00dev, TXRX_CSR8, &reg);
	rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_24MBS, 44);
	rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_36MBS, 42);
	rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_48MBS, 42);
	rt2x00_set_field32(&reg, TXRX_CSR8_ACK_CTS_54MBS, 42);
	rt73usb_register_write(rt2x00dev, TXRX_CSR8, reg);

	rt73usb_register_write(rt2x00dev, TXRX_CSR15, 0x0000000f);

	rt73usb_register_read(rt2x00dev, MAC_CSR6, &reg);
	rt2x00_set_field32(&reg, MAC_CSR6_MAX_FRAME_UNIT, 0xfff);
	rt73usb_register_write(rt2x00dev, MAC_CSR6, reg);

	rt73usb_register_write(rt2x00dev, MAC_CSR10, 0x00000718);

	if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_AWAKE))
		return -EBUSY;

	rt73usb_register_write(rt2x00dev, MAC_CSR13, 0x00007f00);

	/*
	 * Invalidate all Shared Keys (SEC_CSR0),
	 * and clear the Shared key Cipher algorithms (SEC_CSR1 & SEC_CSR5)
	 */
	rt73usb_register_write(rt2x00dev, SEC_CSR0, 0x00000000);
	rt73usb_register_write(rt2x00dev, SEC_CSR1, 0x00000000);
	rt73usb_register_write(rt2x00dev, SEC_CSR5, 0x00000000);

	reg = 0x000023b0;
	if (rt2x00_rf(&rt2x00dev->chip, RF5225) ||