rt2500usb.c 59.8 KB
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/*
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	Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
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	<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: rt2500usb
	Abstract: rt2500usb device specific routines.
	Supported chipsets: RT2570.
 */

#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 "rt2500usb.h"

/*
 * Register access.
 * All access to the CSR registers will go through the methods
 * rt2500usb_register_read and rt2500usb_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.
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 * If the usb_cache_mutex is already held then the _lock variants must
 * be used instead.
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 */
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static inline void rt2500usb_register_read(struct rt2x00_dev *rt2x00dev,
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					   const unsigned int offset,
					   u16 *value)
{
	__le16 reg;
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
				      USB_VENDOR_REQUEST_IN, offset,
				      &reg, sizeof(u16), REGISTER_TIMEOUT);
	*value = le16_to_cpu(reg);
}

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static inline void rt2500usb_register_read_lock(struct rt2x00_dev *rt2x00dev,
						const unsigned int offset,
						u16 *value)
{
	__le16 reg;
	rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_READ,
				       USB_VENDOR_REQUEST_IN, offset,
				       &reg, sizeof(u16), REGISTER_TIMEOUT);
	*value = le16_to_cpu(reg);
}

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static inline void rt2500usb_register_multiread(struct rt2x00_dev *rt2x00dev,
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						const unsigned int offset,
						void *value, const u16 length)
{
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_READ,
				      USB_VENDOR_REQUEST_IN, offset,
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				      value, length,
				      REGISTER_TIMEOUT16(length));
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}

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static inline void rt2500usb_register_write(struct rt2x00_dev *rt2x00dev,
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					    const unsigned int offset,
					    u16 value)
{
	__le16 reg = cpu_to_le16(value);
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
				      USB_VENDOR_REQUEST_OUT, offset,
				      &reg, sizeof(u16), REGISTER_TIMEOUT);
}

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static inline void rt2500usb_register_write_lock(struct rt2x00_dev *rt2x00dev,
						 const unsigned int offset,
						 u16 value)
{
	__le16 reg = cpu_to_le16(value);
	rt2x00usb_vendor_req_buff_lock(rt2x00dev, USB_MULTI_WRITE,
				       USB_VENDOR_REQUEST_OUT, offset,
				       &reg, sizeof(u16), REGISTER_TIMEOUT);
}

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static inline void rt2500usb_register_multiwrite(struct rt2x00_dev *rt2x00dev,
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						 const unsigned int offset,
						 void *value, const u16 length)
{
	rt2x00usb_vendor_request_buff(rt2x00dev, USB_MULTI_WRITE,
				      USB_VENDOR_REQUEST_OUT, offset,
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				      value, length,
				      REGISTER_TIMEOUT16(length));
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}

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static u16 rt2500usb_bbp_check(struct rt2x00_dev *rt2x00dev)
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{
	u16 reg;
	unsigned int i;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
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		rt2500usb_register_read_lock(rt2x00dev, PHY_CSR8, &reg);
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		if (!rt2x00_get_field16(reg, PHY_CSR8_BUSY))
			break;
		udelay(REGISTER_BUSY_DELAY);
	}

	return reg;
}

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static void rt2500usb_bbp_write(struct rt2x00_dev *rt2x00dev,
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				const unsigned int word, const u8 value)
{
	u16 reg;

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	mutex_lock(&rt2x00dev->usb_cache_mutex);

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	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt2500usb_bbp_check(rt2x00dev);
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	if (rt2x00_get_field16(reg, PHY_CSR8_BUSY))
		goto exit_fail;
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	/*
	 * Write the data into the BBP.
	 */
	reg = 0;
	rt2x00_set_field16(&reg, PHY_CSR7_DATA, value);
	rt2x00_set_field16(&reg, PHY_CSR7_REG_ID, word);
	rt2x00_set_field16(&reg, PHY_CSR7_READ_CONTROL, 0);

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	rt2500usb_register_write_lock(rt2x00dev, PHY_CSR7, reg);

	mutex_unlock(&rt2x00dev->usb_cache_mutex);
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	return;

exit_fail:
	mutex_unlock(&rt2x00dev->usb_cache_mutex);

	ERROR(rt2x00dev, "PHY_CSR8 register busy. Write failed.\n");
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}

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static void rt2500usb_bbp_read(struct rt2x00_dev *rt2x00dev,
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			       const unsigned int word, u8 *value)
{
	u16 reg;

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	mutex_lock(&rt2x00dev->usb_cache_mutex);

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	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt2500usb_bbp_check(rt2x00dev);
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	if (rt2x00_get_field16(reg, PHY_CSR8_BUSY))
		goto exit_fail;
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	/*
	 * Write the request into the BBP.
	 */
	reg = 0;
	rt2x00_set_field16(&reg, PHY_CSR7_REG_ID, word);
	rt2x00_set_field16(&reg, PHY_CSR7_READ_CONTROL, 1);

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	rt2500usb_register_write_lock(rt2x00dev, PHY_CSR7, reg);
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	/*
	 * Wait until the BBP becomes ready.
	 */
	reg = rt2500usb_bbp_check(rt2x00dev);
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	if (rt2x00_get_field16(reg, PHY_CSR8_BUSY))
		goto exit_fail;
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	rt2500usb_register_read_lock(rt2x00dev, PHY_CSR7, &reg);
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	*value = rt2x00_get_field16(reg, PHY_CSR7_DATA);
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	mutex_unlock(&rt2x00dev->usb_cache_mutex);
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	return;

exit_fail:
	mutex_unlock(&rt2x00dev->usb_cache_mutex);

	ERROR(rt2x00dev, "PHY_CSR8 register busy. Read failed.\n");
	*value = 0xff;
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}

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static void rt2500usb_rf_write(struct rt2x00_dev *rt2x00dev,
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			       const unsigned int word, const u32 value)
{
	u16 reg;
	unsigned int i;

	if (!word)
		return;

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	mutex_lock(&rt2x00dev->usb_cache_mutex);

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	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
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		rt2500usb_register_read_lock(rt2x00dev, PHY_CSR10, &reg);
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		if (!rt2x00_get_field16(reg, PHY_CSR10_RF_BUSY))
			goto rf_write;
		udelay(REGISTER_BUSY_DELAY);
	}

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	mutex_unlock(&rt2x00dev->usb_cache_mutex);
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	ERROR(rt2x00dev, "PHY_CSR10 register busy. Write failed.\n");
	return;

rf_write:
	reg = 0;
	rt2x00_set_field16(&reg, PHY_CSR9_RF_VALUE, value);
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	rt2500usb_register_write_lock(rt2x00dev, PHY_CSR9, reg);
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	reg = 0;
	rt2x00_set_field16(&reg, PHY_CSR10_RF_VALUE, value >> 16);
	rt2x00_set_field16(&reg, PHY_CSR10_RF_NUMBER_OF_BITS, 20);
	rt2x00_set_field16(&reg, PHY_CSR10_RF_IF_SELECT, 0);
	rt2x00_set_field16(&reg, PHY_CSR10_RF_BUSY, 1);

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	rt2500usb_register_write_lock(rt2x00dev, PHY_CSR10, reg);
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	rt2x00_rf_write(rt2x00dev, word, value);
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	mutex_unlock(&rt2x00dev->usb_cache_mutex);
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}

#ifdef CONFIG_RT2X00_LIB_DEBUGFS
#define CSR_OFFSET(__word)	( CSR_REG_BASE + ((__word) * sizeof(u16)) )

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static void rt2500usb_read_csr(struct rt2x00_dev *rt2x00dev,
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			       const unsigned int word, u32 *data)
{
	rt2500usb_register_read(rt2x00dev, CSR_OFFSET(word), (u16 *) data);
}

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static void rt2500usb_write_csr(struct rt2x00_dev *rt2x00dev,
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				const unsigned int word, u32 data)
{
	rt2500usb_register_write(rt2x00dev, CSR_OFFSET(word), data);
}

static const struct rt2x00debug rt2500usb_rt2x00debug = {
	.owner	= THIS_MODULE,
	.csr	= {
		.read		= rt2500usb_read_csr,
		.write		= rt2500usb_write_csr,
		.word_size	= sizeof(u16),
		.word_count	= CSR_REG_SIZE / sizeof(u16),
	},
	.eeprom	= {
		.read		= rt2x00_eeprom_read,
		.write		= rt2x00_eeprom_write,
		.word_size	= sizeof(u16),
		.word_count	= EEPROM_SIZE / sizeof(u16),
	},
	.bbp	= {
		.read		= rt2500usb_bbp_read,
		.write		= rt2500usb_bbp_write,
		.word_size	= sizeof(u8),
		.word_count	= BBP_SIZE / sizeof(u8),
	},
	.rf	= {
		.read		= rt2x00_rf_read,
		.write		= rt2500usb_rf_write,
		.word_size	= sizeof(u32),
		.word_count	= RF_SIZE / sizeof(u32),
	},
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

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#ifdef CONFIG_RT2500USB_LEDS
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static void rt2500usb_brightness_set(struct led_classdev *led_cdev,
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				     enum led_brightness brightness)
{
	struct rt2x00_led *led =
	    container_of(led_cdev, struct rt2x00_led, led_dev);
	unsigned int enabled = brightness != LED_OFF;
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	u16 reg;
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	rt2500usb_register_read(led->rt2x00dev, MAC_CSR20, &reg);
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	if (led->type == LED_TYPE_RADIO || led->type == LED_TYPE_ASSOC)
		rt2x00_set_field16(&reg, MAC_CSR20_LINK, enabled);
	else if (led->type == LED_TYPE_ACTIVITY)
		rt2x00_set_field16(&reg, MAC_CSR20_ACTIVITY, enabled);

	rt2500usb_register_write(led->rt2x00dev, MAC_CSR20, reg);
}

static int rt2500usb_blink_set(struct led_classdev *led_cdev,
			       unsigned long *delay_on,
			       unsigned long *delay_off)
{
	struct rt2x00_led *led =
	    container_of(led_cdev, struct rt2x00_led, led_dev);
	u16 reg;

	rt2500usb_register_read(led->rt2x00dev, MAC_CSR21, &reg);
	rt2x00_set_field16(&reg, MAC_CSR21_ON_PERIOD, *delay_on);
	rt2x00_set_field16(&reg, MAC_CSR21_OFF_PERIOD, *delay_off);
	rt2500usb_register_write(led->rt2x00dev, MAC_CSR21, reg);
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	return 0;
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}
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static void rt2500usb_init_led(struct rt2x00_dev *rt2x00dev,
			       struct rt2x00_led *led,
			       enum led_type type)
{
	led->rt2x00dev = rt2x00dev;
	led->type = type;
	led->led_dev.brightness_set = rt2500usb_brightness_set;
	led->led_dev.blink_set = rt2500usb_blink_set;
	led->flags = LED_INITIALIZED;
}
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#endif /* CONFIG_RT2500USB_LEDS */

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/*
 * Configuration handlers.
 */
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static void rt2500usb_config_filter(struct rt2x00_dev *rt2x00dev,
				    const unsigned int filter_flags)
{
	u16 reg;

	/*
	 * Start configuration steps.
	 * Note that the version error will always be dropped
	 * and broadcast frames will always be accepted since
	 * there is no filter for it at this time.
	 */
	rt2500usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_CRC,
			   !(filter_flags & FIF_FCSFAIL));
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_PHYSICAL,
			   !(filter_flags & FIF_PLCPFAIL));
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_CONTROL,
			   !(filter_flags & FIF_CONTROL));
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_NOT_TO_ME,
			   !(filter_flags & FIF_PROMISC_IN_BSS));
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_TODS,
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			   !(filter_flags & FIF_PROMISC_IN_BSS) &&
			   !rt2x00dev->intf_ap_count);
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	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_VERSION_ERROR, 1);
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_MULTICAST,
			   !(filter_flags & FIF_ALLMULTI));
	rt2x00_set_field16(&reg, TXRX_CSR2_DROP_BROADCAST, 0);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR2, reg);
}

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static void rt2500usb_config_intf(struct rt2x00_dev *rt2x00dev,
				  struct rt2x00_intf *intf,
				  struct rt2x00intf_conf *conf,
				  const unsigned int flags)
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{
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	unsigned int bcn_preload;
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	u16 reg;

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	if (flags & CONFIG_UPDATE_TYPE) {
		/*
		 * Enable beacon config
		 */
		bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20);
		rt2500usb_register_read(rt2x00dev, TXRX_CSR20, &reg);
		rt2x00_set_field16(&reg, TXRX_CSR20_OFFSET, bcn_preload >> 6);
		rt2x00_set_field16(&reg, TXRX_CSR20_BCN_EXPECT_WINDOW,
				   2 * (conf->type != IEEE80211_IF_TYPE_STA));
		rt2500usb_register_write(rt2x00dev, TXRX_CSR20, reg);
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		/*
		 * Enable synchronisation.
		 */
		rt2500usb_register_read(rt2x00dev, TXRX_CSR18, &reg);
		rt2x00_set_field16(&reg, TXRX_CSR18_OFFSET, 0);
		rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);

		rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
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		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
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		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_SYNC, conf->sync);
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		rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 1);
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		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
	}
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	if (flags & CONFIG_UPDATE_MAC)
		rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR2, conf->mac,
					      (3 * sizeof(__le16)));

	if (flags & CONFIG_UPDATE_BSSID)
		rt2500usb_register_multiwrite(rt2x00dev, MAC_CSR5, conf->bssid,
					      (3 * sizeof(__le16)));
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}

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static void rt2500usb_config_erp(struct rt2x00_dev *rt2x00dev,
				 struct rt2x00lib_erp *erp)
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{
	u16 reg;

	rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
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	rt2x00_set_field16(&reg, TXRX_CSR1_ACK_TIMEOUT, erp->ack_timeout);
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	rt2500usb_register_write(rt2x00dev, TXRX_CSR1, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR10, &reg);
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	rt2x00_set_field16(&reg, TXRX_CSR10_AUTORESPOND_PREAMBLE,
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			   !!erp->short_preamble);
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	rt2500usb_register_write(rt2x00dev, TXRX_CSR10, reg);
}

static void rt2500usb_config_phymode(struct rt2x00_dev *rt2x00dev,
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				     const int basic_rate_mask)
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{
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	rt2500usb_register_write(rt2x00dev, TXRX_CSR11, basic_rate_mask);
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}

static void rt2500usb_config_channel(struct rt2x00_dev *rt2x00dev,
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				     struct rf_channel *rf, const int txpower)
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{
	/*
	 * Set TXpower.
	 */
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	rt2x00_set_field32(&rf->rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));
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	/*
	 * For RT2525E we should first set the channel to half band higher.
	 */
	if (rt2x00_rf(&rt2x00dev->chip, RF2525E)) {
		static const u32 vals[] = {
			0x000008aa, 0x000008ae, 0x000008ae, 0x000008b2,
			0x000008b2, 0x000008b6, 0x000008b6, 0x000008ba,
			0x000008ba, 0x000008be, 0x000008b7, 0x00000902,
			0x00000902, 0x00000906
		};

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		rt2500usb_rf_write(rt2x00dev, 2, vals[rf->channel - 1]);
		if (rf->rf4)
			rt2500usb_rf_write(rt2x00dev, 4, rf->rf4);
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	}

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	rt2500usb_rf_write(rt2x00dev, 1, rf->rf1);
	rt2500usb_rf_write(rt2x00dev, 2, rf->rf2);
	rt2500usb_rf_write(rt2x00dev, 3, rf->rf3);
	if (rf->rf4)
		rt2500usb_rf_write(rt2x00dev, 4, rf->rf4);
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}

static void rt2500usb_config_txpower(struct rt2x00_dev *rt2x00dev,
				     const int txpower)
{
	u32 rf3;

	rt2x00_rf_read(rt2x00dev, 3, &rf3);
	rt2x00_set_field32(&rf3, RF3_TXPOWER, TXPOWER_TO_DEV(txpower));
	rt2500usb_rf_write(rt2x00dev, 3, rf3);
}

static void rt2500usb_config_antenna(struct rt2x00_dev *rt2x00dev,
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				     struct antenna_setup *ant)
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{
	u8 r2;
	u8 r14;
	u16 csr5;
	u16 csr6;

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	/*
	 * We should never come here because rt2x00lib is supposed
	 * to catch this and send us the correct antenna explicitely.
	 */
	BUG_ON(ant->rx == ANTENNA_SW_DIVERSITY ||
	       ant->tx == ANTENNA_SW_DIVERSITY);

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	rt2500usb_bbp_read(rt2x00dev, 2, &r2);
	rt2500usb_bbp_read(rt2x00dev, 14, &r14);
	rt2500usb_register_read(rt2x00dev, PHY_CSR5, &csr5);
	rt2500usb_register_read(rt2x00dev, PHY_CSR6, &csr6);

	/*
	 * Configure the TX antenna.
	 */
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	switch (ant->tx) {
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	case ANTENNA_HW_DIVERSITY:
		rt2x00_set_field8(&r2, BBP_R2_TX_ANTENNA, 1);
		rt2x00_set_field16(&csr5, PHY_CSR5_CCK, 1);
		rt2x00_set_field16(&csr6, PHY_CSR6_OFDM, 1);
		break;
	case ANTENNA_A:
		rt2x00_set_field8(&r2, BBP_R2_TX_ANTENNA, 0);
		rt2x00_set_field16(&csr5, PHY_CSR5_CCK, 0);
		rt2x00_set_field16(&csr6, PHY_CSR6_OFDM, 0);
		break;
	case ANTENNA_B:
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	default:
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		rt2x00_set_field8(&r2, BBP_R2_TX_ANTENNA, 2);
		rt2x00_set_field16(&csr5, PHY_CSR5_CCK, 2);
		rt2x00_set_field16(&csr6, PHY_CSR6_OFDM, 2);
		break;
	}

	/*
	 * Configure the RX antenna.
	 */
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	switch (ant->rx) {
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	case ANTENNA_HW_DIVERSITY:
		rt2x00_set_field8(&r14, BBP_R14_RX_ANTENNA, 1);
		break;
	case ANTENNA_A:
		rt2x00_set_field8(&r14, BBP_R14_RX_ANTENNA, 0);
		break;
	case ANTENNA_B:
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	default:
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		rt2x00_set_field8(&r14, BBP_R14_RX_ANTENNA, 2);
		break;
	}

	/*
	 * RT2525E and RT5222 need to flip TX I/Q
	 */
	if (rt2x00_rf(&rt2x00dev->chip, RF2525E) ||
	    rt2x00_rf(&rt2x00dev->chip, RF5222)) {
		rt2x00_set_field8(&r2, BBP_R2_TX_IQ_FLIP, 1);
		rt2x00_set_field16(&csr5, PHY_CSR5_CCK_FLIP, 1);
		rt2x00_set_field16(&csr6, PHY_CSR6_OFDM_FLIP, 1);

		/*
		 * RT2525E does not need RX I/Q Flip.
		 */
		if (rt2x00_rf(&rt2x00dev->chip, RF2525E))
			rt2x00_set_field8(&r14, BBP_R14_RX_IQ_FLIP, 0);
	} else {
		rt2x00_set_field16(&csr5, PHY_CSR5_CCK_FLIP, 0);
		rt2x00_set_field16(&csr6, PHY_CSR6_OFDM_FLIP, 0);
	}

	rt2500usb_bbp_write(rt2x00dev, 2, r2);
	rt2500usb_bbp_write(rt2x00dev, 14, r14);
	rt2500usb_register_write(rt2x00dev, PHY_CSR5, csr5);
	rt2500usb_register_write(rt2x00dev, PHY_CSR6, csr6);
}

static void rt2500usb_config_duration(struct rt2x00_dev *rt2x00dev,
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				      struct rt2x00lib_conf *libconf)
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{
	u16 reg;

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	rt2500usb_register_write(rt2x00dev, MAC_CSR10, libconf->slot_time);
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	rt2500usb_register_write(rt2x00dev, MAC_CSR11, libconf->sifs);
	rt2500usb_register_write(rt2x00dev, MAC_CSR12, libconf->eifs);
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	rt2500usb_register_read(rt2x00dev, TXRX_CSR18, &reg);
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	rt2x00_set_field16(&reg, TXRX_CSR18_INTERVAL,
			   libconf->conf->beacon_int * 4);
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	rt2500usb_register_write(rt2x00dev, TXRX_CSR18, reg);
}

static void rt2500usb_config(struct rt2x00_dev *rt2x00dev,
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			     struct rt2x00lib_conf *libconf,
			     const unsigned int flags)
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{
	if (flags & CONFIG_UPDATE_PHYMODE)
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		rt2500usb_config_phymode(rt2x00dev, libconf->basic_rates);
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	if (flags & CONFIG_UPDATE_CHANNEL)
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		rt2500usb_config_channel(rt2x00dev, &libconf->rf,
					 libconf->conf->power_level);
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	if ((flags & CONFIG_UPDATE_TXPOWER) && !(flags & CONFIG_UPDATE_CHANNEL))
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		rt2500usb_config_txpower(rt2x00dev,
					 libconf->conf->power_level);
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	if (flags & CONFIG_UPDATE_ANTENNA)
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		rt2500usb_config_antenna(rt2x00dev, &libconf->ant);
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	if (flags & (CONFIG_UPDATE_SLOT_TIME | CONFIG_UPDATE_BEACON_INT))
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		rt2500usb_config_duration(rt2x00dev, libconf);
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}

/*
 * Link tuning
 */
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static void rt2500usb_link_stats(struct rt2x00_dev *rt2x00dev,
				 struct link_qual *qual)
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{
	u16 reg;

	/*
	 * Update FCS error count from register.
	 */
	rt2500usb_register_read(rt2x00dev, STA_CSR0, &reg);
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	qual->rx_failed = rt2x00_get_field16(reg, STA_CSR0_FCS_ERROR);
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	/*
	 * Update False CCA count from register.
	 */
	rt2500usb_register_read(rt2x00dev, STA_CSR3, &reg);
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	qual->false_cca = rt2x00_get_field16(reg, STA_CSR3_FALSE_CCA_ERROR);
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}

static void rt2500usb_reset_tuner(struct rt2x00_dev *rt2x00dev)
{
	u16 eeprom;
	u16 value;

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &eeprom);
	value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_R24_LOW);
	rt2500usb_bbp_write(rt2x00dev, 24, value);

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R25, &eeprom);
	value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_R25_LOW);
	rt2500usb_bbp_write(rt2x00dev, 25, value);

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R61, &eeprom);
	value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_R61_LOW);
	rt2500usb_bbp_write(rt2x00dev, 61, value);

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &eeprom);
	value = rt2x00_get_field16(eeprom, EEPROM_BBPTUNE_VGCUPPER);
	rt2500usb_bbp_write(rt2x00dev, 17, value);

	rt2x00dev->link.vgc_level = value;
}

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/*
 * NOTE: This function is directly ported from legacy driver, but
 * despite it being declared it was never called. Although link tuning
 * sounds like a good idea, and usually works well for the other drivers,
 * it does _not_ work with rt2500usb. Enabling this function will result
 * in TX capabilities only until association kicks in. Immediately
 * after the successful association all TX frames will be kept in the
 * hardware queue and never transmitted.
 */
#if 0
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static void rt2500usb_link_tuner(struct rt2x00_dev *rt2x00dev)
{
	int rssi = rt2x00_get_link_rssi(&rt2x00dev->link);
	u16 bbp_thresh;
	u16 vgc_bound;
	u16 sens;
	u16 r24;
	u16 r25;
	u16 r61;
	u16 r17_sens;
	u8 r17;
	u8 up_bound;
	u8 low_bound;

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	/*
	 * Read current r17 value, as well as the sensitivity values
	 * for the r17 register.
	 */
	rt2500usb_bbp_read(rt2x00dev, 17, &r17);
	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R17, &r17_sens);

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &vgc_bound);
	up_bound = rt2x00_get_field16(vgc_bound, EEPROM_BBPTUNE_VGCUPPER);
	low_bound = rt2x00_get_field16(vgc_bound, EEPROM_BBPTUNE_VGCLOWER);

	/*
	 * If we are not associated, we should go straight to the
	 * dynamic CCA tuning.
	 */
	if (!rt2x00dev->intf_associated)
		goto dynamic_cca_tune;

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	/*
	 * Determine the BBP tuning threshold and correctly
	 * set BBP 24, 25 and 61.
	 */
	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE, &bbp_thresh);
	bbp_thresh = rt2x00_get_field16(bbp_thresh, EEPROM_BBPTUNE_THRESHOLD);

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &r24);
	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R25, &r25);
	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R61, &r61);

	if ((rssi + bbp_thresh) > 0) {
		r24 = rt2x00_get_field16(r24, EEPROM_BBPTUNE_R24_HIGH);
		r25 = rt2x00_get_field16(r25, EEPROM_BBPTUNE_R25_HIGH);
		r61 = rt2x00_get_field16(r61, EEPROM_BBPTUNE_R61_HIGH);
	} else {
		r24 = rt2x00_get_field16(r24, EEPROM_BBPTUNE_R24_LOW);
		r25 = rt2x00_get_field16(r25, EEPROM_BBPTUNE_R25_LOW);
		r61 = rt2x00_get_field16(r61, EEPROM_BBPTUNE_R61_LOW);
	}

	rt2500usb_bbp_write(rt2x00dev, 24, r24);
	rt2500usb_bbp_write(rt2x00dev, 25, r25);
	rt2500usb_bbp_write(rt2x00dev, 61, r61);

	/*
	 * A too low RSSI will cause too much false CCA which will
	 * then corrupt the R17 tuning. To remidy this the tuning should
	 * be stopped (While making sure the R17 value will not exceed limits)
	 */
	if (rssi >= -40) {
		if (r17 != 0x60)
			rt2500usb_bbp_write(rt2x00dev, 17, 0x60);
		return;
	}

	/*
	 * Special big-R17 for short distance
	 */
	if (rssi >= -58) {
		sens = rt2x00_get_field16(r17_sens, EEPROM_BBPTUNE_R17_LOW);
		if (r17 != sens)
			rt2500usb_bbp_write(rt2x00dev, 17, sens);
		return;
	}

	/*
	 * Special mid-R17 for middle distance
	 */
	if (rssi >= -74) {
		sens = rt2x00_get_field16(r17_sens, EEPROM_BBPTUNE_R17_HIGH);
		if (r17 != sens)
			rt2500usb_bbp_write(rt2x00dev, 17, sens);
		return;
	}

	/*
	 * Leave short or middle distance condition, restore r17
	 * to the dynamic tuning range.
	 */
	low_bound = 0x32;
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	if (rssi < -77)
		up_bound -= (-77 - rssi);
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	if (up_bound < low_bound)
		up_bound = low_bound;

	if (r17 > up_bound) {
		rt2500usb_bbp_write(rt2x00dev, 17, up_bound);
		rt2x00dev->link.vgc_level = up_bound;
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		return;
	}

dynamic_cca_tune:

	/*
	 * R17 is inside the dynamic tuning range,
	 * start tuning the link based on the false cca counter.
	 */
	if (rt2x00dev->link.qual.false_cca > 512 && r17 < up_bound) {
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		rt2500usb_bbp_write(rt2x00dev, 17, ++r17);
		rt2x00dev->link.vgc_level = r17;
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	} else if (rt2x00dev->link.qual.false_cca < 100 && r17 > low_bound) {
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		rt2500usb_bbp_write(rt2x00dev, 17, --r17);
		rt2x00dev->link.vgc_level = r17;
	}
}
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#else
#define rt2500usb_link_tuner	NULL
#endif
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/*
 * Initialization functions.
 */
static int rt2500usb_init_registers(struct rt2x00_dev *rt2x00dev)
{
	u16 reg;

	rt2x00usb_vendor_request_sw(rt2x00dev, USB_DEVICE_MODE, 0x0001,
				    USB_MODE_TEST, REGISTER_TIMEOUT);
	rt2x00usb_vendor_request_sw(rt2x00dev, USB_SINGLE_WRITE, 0x0308,
				    0x00f0, REGISTER_TIMEOUT);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR2_DISABLE_RX, 1);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR2, reg);

	rt2500usb_register_write(rt2x00dev, MAC_CSR13, 0x1111);
	rt2500usb_register_write(rt2x00dev, MAC_CSR14, 0x1e11);

	rt2500usb_register_read(rt2x00dev, MAC_CSR1, &reg);
	rt2x00_set_field16(&reg, MAC_CSR1_SOFT_RESET, 1);
	rt2x00_set_field16(&reg, MAC_CSR1_BBP_RESET, 1);
	rt2x00_set_field16(&reg, MAC_CSR1_HOST_READY, 0);
	rt2500usb_register_write(rt2x00dev, MAC_CSR1, reg);

	rt2500usb_register_read(rt2x00dev, MAC_CSR1, &reg);
	rt2x00_set_field16(&reg, MAC_CSR1_SOFT_RESET, 0);
	rt2x00_set_field16(&reg, MAC_CSR1_BBP_RESET, 0);
	rt2x00_set_field16(&reg, MAC_CSR1_HOST_READY, 0);
	rt2500usb_register_write(rt2x00dev, MAC_CSR1, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR5, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID0, 13);
	rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID0_VALID, 1);
	rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID1, 12);
	rt2x00_set_field16(&reg, TXRX_CSR5_BBP_ID1_VALID, 1);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR5, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR6, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID0, 10);
	rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID0_VALID, 1);
	rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID1, 11);
	rt2x00_set_field16(&reg, TXRX_CSR6_BBP_ID1_VALID, 1);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR6, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR7, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID0, 7);
	rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID0_VALID, 1);
	rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID1, 6);
	rt2x00_set_field16(&reg, TXRX_CSR7_BBP_ID1_VALID, 1);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR7, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR8, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID0, 5);
	rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID0_VALID, 1);
	rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID1, 0);
	rt2x00_set_field16(&reg, TXRX_CSR8_BBP_ID1_VALID, 0);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR8, reg);

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	rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 0);
	rt2x00_set_field16(&reg, TXRX_CSR19_TSF_SYNC, 0);
	rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 0);
	rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);

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	rt2500usb_register_write(rt2x00dev, TXRX_CSR21, 0xe78f);
	rt2500usb_register_write(rt2x00dev, MAC_CSR9, 0xff1d);

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

	rt2500usb_register_read(rt2x00dev, MAC_CSR1, &reg);
	rt2x00_set_field16(&reg, MAC_CSR1_SOFT_RESET, 0);
	rt2x00_set_field16(&reg, MAC_CSR1_BBP_RESET, 0);
	rt2x00_set_field16(&reg, MAC_CSR1_HOST_READY, 1);
	rt2500usb_register_write(rt2x00dev, MAC_CSR1, reg);

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	if (rt2x00_rev(&rt2x00dev->chip) >= RT2570_VERSION_C) {
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		rt2500usb_register_read(rt2x00dev, PHY_CSR2, &reg);
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		rt2x00_set_field16(&reg, PHY_CSR2_LNA, 0);
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	} else {
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		reg = 0;
		rt2x00_set_field16(&reg, PHY_CSR2_LNA, 1);
		rt2x00_set_field16(&reg, PHY_CSR2_LNA_MODE, 3);
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	}
	rt2500usb_register_write(rt2x00dev, PHY_CSR2, reg);

	rt2500usb_register_write(rt2x00dev, MAC_CSR11, 0x0002);
	rt2500usb_register_write(rt2x00dev, MAC_CSR22, 0x0053);
	rt2500usb_register_write(rt2x00dev, MAC_CSR15, 0x01ee);
	rt2500usb_register_write(rt2x00dev, MAC_CSR16, 0x0000);

	rt2500usb_register_read(rt2x00dev, MAC_CSR8, &reg);
	rt2x00_set_field16(&reg, MAC_CSR8_MAX_FRAME_UNIT,
			   rt2x00dev->rx->data_size);
	rt2500usb_register_write(rt2x00dev, MAC_CSR8, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR0, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR0_IV_OFFSET, IEEE80211_HEADER);
	rt2x00_set_field16(&reg, TXRX_CSR0_KEY_ID, 0xff);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR0, reg);

	rt2500usb_register_read(rt2x00dev, MAC_CSR18, &reg);
	rt2x00_set_field16(&reg, MAC_CSR18_DELAY_AFTER_BEACON, 90);
	rt2500usb_register_write(rt2x00dev, MAC_CSR18, reg);

	rt2500usb_register_read(rt2x00dev, PHY_CSR4, &reg);
	rt2x00_set_field16(&reg, PHY_CSR4_LOW_RF_LE, 1);
	rt2500usb_register_write(rt2x00dev, PHY_CSR4, reg);

	rt2500usb_register_read(rt2x00dev, TXRX_CSR1, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR1_AUTO_SEQUENCE, 1);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR1, reg);

	return 0;
}

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static int rt2500usb_wait_bbp_ready(struct rt2x00_dev *rt2x00dev)
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{
	unsigned int i;
	u8 value;

	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		rt2500usb_bbp_read(rt2x00dev, 0, &value);
		if ((value != 0xff) && (value != 0x00))
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			return 0;
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		udelay(REGISTER_BUSY_DELAY);
	}

	ERROR(rt2x00dev, "BBP register access failed, aborting.\n");
	return -EACCES;
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}

static int rt2500usb_init_bbp(struct rt2x00_dev *rt2x00dev)
{
	unsigned int i;
	u16 eeprom;
	u8 value;
	u8 reg_id;

	if (unlikely(rt2500usb_wait_bbp_ready(rt2x00dev)))
		return -EACCES;
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	rt2500usb_bbp_write(rt2x00dev, 3, 0x02);
	rt2500usb_bbp_write(rt2x00dev, 4, 0x19);
	rt2500usb_bbp_write(rt2x00dev, 14, 0x1c);
	rt2500usb_bbp_write(rt2x00dev, 15, 0x30);
	rt2500usb_bbp_write(rt2x00dev, 16, 0xac);
	rt2500usb_bbp_write(rt2x00dev, 18, 0x18);
	rt2500usb_bbp_write(rt2x00dev, 19, 0xff);
	rt2500usb_bbp_write(rt2x00dev, 20, 0x1e);
	rt2500usb_bbp_write(rt2x00dev, 21, 0x08);
	rt2500usb_bbp_write(rt2x00dev, 22, 0x08);
	rt2500usb_bbp_write(rt2x00dev, 23, 0x08);
	rt2500usb_bbp_write(rt2x00dev, 24, 0x80);
	rt2500usb_bbp_write(rt2x00dev, 25, 0x50);
	rt2500usb_bbp_write(rt2x00dev, 26, 0x08);
	rt2500usb_bbp_write(rt2x00dev, 27, 0x23);
	rt2500usb_bbp_write(rt2x00dev, 30, 0x10);
	rt2500usb_bbp_write(rt2x00dev, 31, 0x2b);
	rt2500usb_bbp_write(rt2x00dev, 32, 0xb9);
	rt2500usb_bbp_write(rt2x00dev, 34, 0x12);
	rt2500usb_bbp_write(rt2x00dev, 35, 0x50);
	rt2500usb_bbp_write(rt2x00dev, 39, 0xc4);
	rt2500usb_bbp_write(rt2x00dev, 40, 0x02);
	rt2500usb_bbp_write(rt2x00dev, 41, 0x60);
	rt2500usb_bbp_write(rt2x00dev, 53, 0x10);
	rt2500usb_bbp_write(rt2x00dev, 54, 0x18);
	rt2500usb_bbp_write(rt2x00dev, 56, 0x08);
	rt2500usb_bbp_write(rt2x00dev, 57, 0x10);
	rt2500usb_bbp_write(rt2x00dev, 58, 0x08);
	rt2500usb_bbp_write(rt2x00dev, 61, 0x60);
	rt2500usb_bbp_write(rt2x00dev, 62, 0x10);
	rt2500usb_bbp_write(rt2x00dev, 75, 0xff);

	for (i = 0; i < EEPROM_BBP_SIZE; i++) {
		rt2x00_eeprom_read(rt2x00dev, EEPROM_BBP_START + i, &eeprom);

		if (eeprom != 0xffff && eeprom != 0x0000) {
			reg_id = rt2x00_get_field16(eeprom, EEPROM_BBP_REG_ID);
			value = rt2x00_get_field16(eeprom, EEPROM_BBP_VALUE);
			rt2500usb_bbp_write(rt2x00dev, reg_id, value);
		}
	}

	return 0;
}

/*
 * Device state switch handlers.
 */
static void rt2500usb_toggle_rx(struct rt2x00_dev *rt2x00dev,
				enum dev_state state)
{
	u16 reg;

	rt2500usb_register_read(rt2x00dev, TXRX_CSR2, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR2_DISABLE_RX,
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			   (state == STATE_RADIO_RX_OFF) ||
			   (state == STATE_RADIO_RX_OFF_LINK));
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	rt2500usb_register_write(rt2x00dev, TXRX_CSR2, reg);
}

static int rt2500usb_enable_radio(struct rt2x00_dev *rt2x00dev)
{
	/*
	 * Initialize all registers.
	 */
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	if (unlikely(rt2500usb_init_registers(rt2x00dev) ||
		     rt2500usb_init_bbp(rt2x00dev)))
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		return -EIO;

	return 0;
}

static void rt2500usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
	rt2500usb_register_write(rt2x00dev, MAC_CSR13, 0x2121);
	rt2500usb_register_write(rt2x00dev, MAC_CSR14, 0x2121);

	/*
	 * Disable synchronisation.
	 */
	rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);

	rt2x00usb_disable_radio(rt2x00dev);
}

static int rt2500usb_set_state(struct rt2x00_dev *rt2x00dev,
			       enum dev_state state)
{
	u16 reg;
	u16 reg2;
	unsigned int i;
	char put_to_sleep;
	char bbp_state;
	char rf_state;

	put_to_sleep = (state != STATE_AWAKE);

	reg = 0;
	rt2x00_set_field16(&reg, MAC_CSR17_BBP_DESIRE_STATE, state);
	rt2x00_set_field16(&reg, MAC_CSR17_RF_DESIRE_STATE, state);
	rt2x00_set_field16(&reg, MAC_CSR17_PUT_TO_SLEEP, put_to_sleep);
	rt2500usb_register_write(rt2x00dev, MAC_CSR17, reg);
	rt2x00_set_field16(&reg, MAC_CSR17_SET_STATE, 1);
	rt2500usb_register_write(rt2x00dev, MAC_CSR17, reg);

	/*
	 * Device is not guaranteed to be in the requested state yet.
	 * We must wait until the register indicates that the
	 * device has entered the correct state.
	 */
	for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
		rt2500usb_register_read(rt2x00dev, MAC_CSR17, &reg2);
		bbp_state = rt2x00_get_field16(reg2, MAC_CSR17_BBP_CURR_STATE);
		rf_state = rt2x00_get_field16(reg2, MAC_CSR17_RF_CURR_STATE);
		if (bbp_state == state && rf_state == state)
			return 0;
		rt2500usb_register_write(rt2x00dev, MAC_CSR17, reg);
		msleep(30);
	}

	return -EBUSY;
}

static int rt2500usb_set_device_state(struct rt2x00_dev *rt2x00dev,
				      enum dev_state state)
{
	int retval = 0;

	switch (state) {
	case STATE_RADIO_ON:
		retval = rt2500usb_enable_radio(rt2x00dev);
		break;
	case STATE_RADIO_OFF:
		rt2500usb_disable_radio(rt2x00dev);
		break;
	case STATE_RADIO_RX_ON:
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	case STATE_RADIO_RX_ON_LINK:
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	case STATE_RADIO_RX_OFF:
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	case STATE_RADIO_RX_OFF_LINK:
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		rt2500usb_toggle_rx(rt2x00dev, state);
		break;
	case STATE_RADIO_IRQ_ON:
	case STATE_RADIO_IRQ_OFF:
		/* No support, but no error either */
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		break;
	case STATE_DEEP_SLEEP:
	case STATE_SLEEP:
	case STATE_STANDBY:
	case STATE_AWAKE:
		retval = rt2500usb_set_state(rt2x00dev, state);
		break;
	default:
		retval = -ENOTSUPP;
		break;
	}

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	if (unlikely(retval))
		ERROR(rt2x00dev, "Device failed to enter state %d (%d).\n",
		      state, retval);

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	return retval;
}

/*
 * TX descriptor initialization
 */
static void rt2500usb_write_tx_desc(struct rt2x00_dev *rt2x00dev,
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				    struct sk_buff *skb,
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				    struct txentry_desc *txdesc)
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{
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	struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
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	__le32 *txd = skbdesc->desc;
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	u32 word;

	/*
	 * Start writing the descriptor words.
	 */
	rt2x00_desc_read(txd, 1, &word);
	rt2x00_set_field32(&word, TXD_W1_IV_OFFSET, IEEE80211_HEADER);
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	rt2x00_set_field32(&word, TXD_W1_AIFS, txdesc->aifs);
	rt2x00_set_field32(&word, TXD_W1_CWMIN, txdesc->cw_min);
	rt2x00_set_field32(&word, TXD_W1_CWMAX, txdesc->cw_max);
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	rt2x00_desc_write(txd, 1, word);

	rt2x00_desc_read(txd, 2, &word);
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	rt2x00_set_field32(&word, TXD_W2_PLCP_SIGNAL, txdesc->signal);
	rt2x00_set_field32(&word, TXD_W2_PLCP_SERVICE, txdesc->service);
	rt2x00_set_field32(&word, TXD_W2_PLCP_LENGTH_LOW, txdesc->length_low);
	rt2x00_set_field32(&word, TXD_W2_PLCP_LENGTH_HIGH, txdesc->length_high);
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	rt2x00_desc_write(txd, 2, word);

	rt2x00_desc_read(txd, 0, &word);
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	rt2x00_set_field32(&word, TXD_W0_RETRY_LIMIT, txdesc->retry_limit);
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	rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
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			   test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
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	rt2x00_set_field32(&word, TXD_W0_ACK,
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			   test_bit(ENTRY_TXD_ACK, &txdesc->flags));
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	rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
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			   test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
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	rt2x00_set_field32(&word, TXD_W0_OFDM,
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			   test_bit(ENTRY_TXD_OFDM_RATE, &txdesc->flags));
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	rt2x00_set_field32(&word, TXD_W0_NEW_SEQ,
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			   test_bit(ENTRY_TXD_FIRST_FRAGMENT, &txdesc->flags));
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	rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
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	rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, skb->len);
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	rt2x00_set_field32(&word, TXD_W0_CIPHER, CIPHER_NONE);
	rt2x00_desc_write(txd, 0, word);
}

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/*
 * TX data initialization
 */
static void rt2500usb_beacondone(struct urb *urb);

static void rt2500usb_write_beacon(struct queue_entry *entry)
{
	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
	struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
	struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
	int pipe = usb_sndbulkpipe(usb_dev, 1);
	int length;
	u16 reg;
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	u32 word, len;
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	/*
	 * Add the descriptor in front of the skb.
	 */
	skb_push(entry->skb, entry->queue->desc_size);
	memcpy(entry->skb->data, skbdesc->desc, skbdesc->desc_len);
	skbdesc->desc = entry->skb->data;

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	/*
	 * Adjust the beacon databyte count. The current number is
	 * calculated before this function gets called, but falsely
	 * assumes that the descriptor was already present in the SKB.
	 */
	rt2x00_desc_read(skbdesc->desc, 0, &word);
	len  = rt2x00_get_field32(word, TXD_W0_DATABYTE_COUNT);
	len += skbdesc->desc_len;
	rt2x00_set_field32(&word, TXD_W0_DATABYTE_COUNT, len);
	rt2x00_desc_write(skbdesc->desc, 0, word);

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	/*
	 * Disable beaconing while we are reloading the beacon data,
	 * otherwise we might be sending out invalid data.
	 */
	rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
	rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 0);
	rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 0);
	rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 0);
	rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);

	/*
	 * USB devices cannot blindly pass the skb->len as the
	 * length of the data to usb_fill_bulk_urb. Pass the skb
	 * to the driver to determine what the length should be.
	 */
	length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, entry->skb);

	usb_fill_bulk_urb(bcn_priv->urb, usb_dev, pipe,
			  entry->skb->data, length, rt2500usb_beacondone,
			  entry);

	/*
	 * Second we need to create the guardian byte.
	 * We only need a single byte, so lets recycle
	 * the 'flags' field we are not using for beacons.
	 */
	bcn_priv->guardian_data = 0;
	usb_fill_bulk_urb(bcn_priv->guardian_urb, usb_dev, pipe,
			  &bcn_priv->guardian_data, 1, rt2500usb_beacondone,
			  entry);

	/*
	 * Send out the guardian byte.
	 */
	usb_submit_urb(bcn_priv->guardian_urb, GFP_ATOMIC);
}

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static int rt2500usb_get_tx_data_len(struct rt2x00_dev *rt2x00dev,
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				     struct sk_buff *skb)
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{
	int length;

	/*
	 * The length _must_ be a multiple of 2,
	 * but it must _not_ be a multiple of the USB packet size.
	 */
	length = roundup(skb->len, 2);
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	length += (2 * !(length % rt2x00dev->usb_maxpacket));
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	return length;
}

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static void rt2500usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
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				    const enum data_queue_qid queue)
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{
	u16 reg;

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	if (queue != QID_BEACON) {
		rt2x00usb_kick_tx_queue(rt2x00dev, queue);
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		return;
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	}
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	rt2500usb_register_read(rt2x00dev, TXRX_CSR19, &reg);
	if (!rt2x00_get_field16(reg, TXRX_CSR19_BEACON_GEN)) {
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		rt2x00_set_field16(&reg, TXRX_CSR19_TSF_COUNT, 1);
		rt2x00_set_field16(&reg, TXRX_CSR19_TBCN, 1);
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		rt2x00_set_field16(&reg, TXRX_CSR19_BEACON_GEN, 1);
		/*
		 * Beacon generation will fail initially.
		 * To prevent this we need to register the TXRX_CSR19
		 * register several times.
		 */
		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, 0);
		rt2500usb_register_write(rt2x00dev, TXRX_CSR19, reg);
	}
}

/*
 * RX control handlers
 */
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static void rt2500usb_fill_rxdone(struct queue_entry *entry,
				  struct rxdone_entry_desc *rxdesc)
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{
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	struct queue_entry_priv_usb *entry_priv = entry->priv_data;
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	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
	__le32 *rxd =
	    (__le32 *)(entry->skb->data +
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		       (entry_priv->urb->actual_length -
			entry->queue->desc_size));
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	u32 word0;
	u32 word1;

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	/*
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	 * Copy descriptor to the skbdesc->desc buffer, making it safe from moving of
	 * frame data in rt2x00usb.
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	 */
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	memcpy(skbdesc->desc, rxd, skbdesc->desc_len);
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	rxd = (__le32 *)skbdesc->desc;
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	/*
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	 * It is now safe to read the descriptor on all architectures.
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	 */
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	rt2x00_desc_read(rxd, 0, &word0);
	rt2x00_desc_read(rxd, 1, &word1);

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	if (rt2x00_get_field32(word0, RXD_W0_CRC_ERROR))
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		rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;
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	if (rt2x00_get_field32(word0, RXD_W0_PHYSICAL_ERROR))
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		rxdesc->flags |= RX_FLAG_FAILED_PLCP_CRC;
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	/*
	 * Obtain the status about this packet.
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	 * When frame was received with an OFDM bitrate,
	 * the signal is the PLCP value. If it was received with
	 * a CCK bitrate the signal is the rate in 100kbit/s.
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	 */
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	rxdesc->signal = rt2x00_get_field32(word1, RXD_W1_SIGNAL);
	rxdesc->rssi = rt2x00_get_field32(word1, RXD_W1_RSSI) -
	    entry->queue->rt2x00dev->rssi_offset;
	rxdesc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);
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	if (rt2x00_get_field32(word0, RXD_W0_OFDM))
		rxdesc->dev_flags |= RXDONE_SIGNAL_PLCP;
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	else
		rxdesc->dev_flags |= RXDONE_SIGNAL_BITRATE;
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	if (rt2x00_get_field32(word0, RXD_W0_MY_BSS))
		rxdesc->dev_flags |= RXDONE_MY_BSS;
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	/*
	 * Adjust the skb memory window to the frame boundaries.
	 */
	skb_trim(entry->skb, rxdesc->size);
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}

/*
 * Interrupt functions.
 */
static void rt2500usb_beacondone(struct urb *urb)
{
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	struct queue_entry *entry = (struct queue_entry *)urb->context;
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	struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
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	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags))
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		return;

	/*
	 * Check if this was the guardian beacon,
	 * if that was the case we need to send the real beacon now.
	 * Otherwise we should free the sk_buffer, the device
	 * should be doing the rest of the work now.
	 */
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	if (bcn_priv->guardian_urb == urb) {
		usb_submit_urb(bcn_priv->urb, GFP_ATOMIC);
	} else if (bcn_priv->urb == urb) {
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		dev_kfree_skb(entry->skb);
		entry->skb = NULL;
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	}
}

/*
 * Device probe functions.
 */
static int rt2500usb_validate_eeprom(struct rt2x00_dev *rt2x00dev)
{
	u16 word;
	u8 *mac;
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	u8 bbp;
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	rt2x00usb_eeprom_read(rt2x00dev, rt2x00dev->eeprom, EEPROM_SIZE);

	/*
	 * Start validation of the data that has been read.
	 */
	mac = rt2x00_eeprom_addr(rt2x00dev, EEPROM_MAC_ADDR_0);
	if (!is_valid_ether_addr(mac)) {
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		DECLARE_MAC_BUF(macbuf);

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		random_ether_addr(mac);
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		EEPROM(rt2x00dev, "MAC: %s\n", print_mac(macbuf, mac));
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	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_ANTENNA, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_ANTENNA_NUM, 2);
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		rt2x00_set_field16(&word, EEPROM_ANTENNA_TX_DEFAULT,
				   ANTENNA_SW_DIVERSITY);
		rt2x00_set_field16(&word, EEPROM_ANTENNA_RX_DEFAULT,
				   ANTENNA_SW_DIVERSITY);
		rt2x00_set_field16(&word, EEPROM_ANTENNA_LED_MODE,
				   LED_MODE_DEFAULT);
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		rt2x00_set_field16(&word, EEPROM_ANTENNA_DYN_TXAGC, 0);
		rt2x00_set_field16(&word, EEPROM_ANTENNA_HARDWARE_RADIO, 0);
		rt2x00_set_field16(&word, EEPROM_ANTENNA_RF_TYPE, RF2522);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_ANTENNA, word);
		EEPROM(rt2x00dev, "Antenna: 0x%04x\n", word);
	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_NIC_CARDBUS_ACCEL, 0);
		rt2x00_set_field16(&word, EEPROM_NIC_DYN_BBP_TUNE, 0);
		rt2x00_set_field16(&word, EEPROM_NIC_CCK_TX_POWER, 0);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_NIC, word);
		EEPROM(rt2x00dev, "NIC: 0x%04x\n", word);
	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_CALIBRATE_OFFSET, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_CALIBRATE_OFFSET_RSSI,
				   DEFAULT_RSSI_OFFSET);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_CALIBRATE_OFFSET, word);
		EEPROM(rt2x00dev, "Calibrate offset: 0x%04x\n", word);
	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_THRESHOLD, 45);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE, word);
		EEPROM(rt2x00dev, "BBPtune: 0x%04x\n", word);
	}

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	/*
	 * Switch lower vgc bound to current BBP R17 value,
	 * lower the value a bit for better quality.
	 */
	rt2500usb_bbp_read(rt2x00dev, 17, &bbp);
	bbp -= 6;

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	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_VGC, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCUPPER, 0x40);
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		rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCLOWER, bbp);
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		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_VGC, word);
		EEPROM(rt2x00dev, "BBPtune vgc: 0x%04x\n", word);
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	} else {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_VGCLOWER, bbp);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_VGC, word);
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	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R17, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R17_LOW, 0x48);
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R17_HIGH, 0x41);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R17, word);
		EEPROM(rt2x00dev, "BBPtune r17: 0x%04x\n", word);
	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R24, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R24_LOW, 0x40);
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R24_HIGH, 0x80);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R24, word);
		EEPROM(rt2x00dev, "BBPtune r24: 0x%04x\n", word);
	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R25, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R25_LOW, 0x40);
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R25_HIGH, 0x50);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R25, word);
		EEPROM(rt2x00dev, "BBPtune r25: 0x%04x\n", word);
	}

	rt2x00_eeprom_read(rt2x00dev, EEPROM_BBPTUNE_R61, &word);
	if (word == 0xffff) {
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R61_LOW, 0x60);
		rt2x00_set_field16(&word, EEPROM_BBPTUNE_R61_HIGH, 0x6d);
		rt2x00_eeprom_write(rt2x00dev, EEPROM_BBPTUNE_R61, word);
		EEPROM(rt2x00dev, "BBPtune r61: 0x%04x\n", word);
	}

	return 0;
}

static int rt2500usb_init_eeprom(struct rt2x00_dev *rt2x00dev)
{
	u16 reg;
	u16 value;
	u16 eeprom;

	/*
	 * Read EEPROM word for configuration.
	 */
	rt2x00_eeprom_read(rt2x00dev, EEPROM_ANTENNA, &eeprom);

	/*
	 * Identify RF chipset.
	 */
	value = rt2x00_get_field16(eeprom, EEPROM_ANTENNA_RF_TYPE);
	rt2500usb_register_read(rt2x00dev, MAC_CSR0, &reg);
	rt2x00_set_chip(rt2x00dev, RT2570, value, reg);

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	if (!rt2x00_check_rev(&rt2x00dev->chip, 0)) {
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		ERROR(rt2x00dev, "Invalid RT chipset detected.\n");
		return -ENODEV;
	}

	if (!rt2x00_rf(&rt2x00dev->chip, RF2522) &&
	    !rt2x00_rf(&rt2x00dev->chip, RF2523) &&
	    !rt2x00_rf(&rt2x00dev->chip, RF2524) &&
	    !rt2x00_rf(&rt2x00dev->chip, RF2525) &&
	    !rt2x00_rf(&rt2x00dev->chip, RF2525E) &&
	    !rt2x00_rf(&rt2x00dev->chip, RF5222)) {
		ERROR(rt2x00dev, "Invalid RF chipset detected.\n");
		return -ENODEV;
	}

	/*
	 * Identify default antenna configuration.
	 */
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	rt2x00dev->default_ant.tx =
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	    rt2x00_get_field16(eeprom, EEPROM_ANTENNA_TX_DEFAULT);
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	rt2x00dev->default_ant.rx =
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	    rt2x00_get_field16(eeprom, EEPROM_ANTENNA_RX_DEFAULT);

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	/*
	 * When the eeprom indicates SW_DIVERSITY use HW_DIVERSITY instead.
	 * I am not 100% sure about this, but the legacy drivers do not
	 * indicate antenna swapping in software is required when
	 * diversity is enabled.
	 */
	if (rt2x00dev->default_ant.tx == ANTENNA_SW_DIVERSITY)
		rt2x00dev->default_ant.tx = ANTENNA_HW_DIVERSITY;
	if (rt2x00dev->default_ant.rx == ANTENNA_SW_DIVERSITY)
		rt2x00dev->default_ant.rx = ANTENNA_HW_DIVERSITY;

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	/*
	 * Store led mode, for correct led behaviour.
	 */
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#ifdef CONFIG_RT2500USB_LEDS
	value = rt2x00_get_field16(eeprom, EEPROM_ANTENNA_LED_MODE);

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	rt2500usb_init_led(rt2x00dev, &rt2x00dev->led_radio, LED_TYPE_RADIO);
	if (value == LED_MODE_TXRX_ACTIVITY)
		rt2500usb_init_led(rt2x00dev, &rt2x00dev->led_qual,
				   LED_TYPE_ACTIVITY);
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#endif /* CONFIG_RT2500USB_LEDS */
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	/*
	 * Check if the BBP tuning should be disabled.
	 */
	rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &eeprom);
	if (rt2x00_get_field16(eeprom, EEPROM_NIC_DYN_BBP_TUNE))
		__set_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags);

	/*
	 * Read the RSSI <-> dBm offset information.
	 */
	rt2x00_eeprom_read(rt2x00dev, EEPROM_CALIBRATE_OFFSET, &eeprom);
	rt2x00dev->rssi_offset =
	    rt2x00_get_field16(eeprom, EEPROM_CALIBRATE_OFFSET_RSSI);

	return 0;
}

/*
 * RF value list for RF2522
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2522[] = {
	{ 1,  0x00002050, 0x000c1fda, 0x00000101, 0 },
	{ 2,  0x00002050, 0x000c1fee, 0x00000101, 0 },
	{ 3,  0x00002050, 0x000c2002, 0x00000101, 0 },
	{ 4,  0x00002050, 0x000c2016, 0x00000101, 0 },
	{ 5,  0x00002050, 0x000c202a, 0x00000101, 0 },
	{ 6,  0x00002050, 0x000c203e, 0x00000101, 0 },
	{ 7,  0x00002050, 0x000c2052, 0x00000101, 0 },
	{ 8,  0x00002050, 0x000c2066, 0x00000101, 0 },
	{ 9,  0x00002050, 0x000c207a, 0x00000101, 0 },
	{ 10, 0x00002050, 0x000c208e, 0x00000101, 0 },
	{ 11, 0x00002050, 0x000c20a2, 0x00000101, 0 },
	{ 12, 0x00002050, 0x000c20b6, 0x00000101, 0 },
	{ 13, 0x00002050, 0x000c20ca, 0x00000101, 0 },
	{ 14, 0x00002050, 0x000c20fa, 0x00000101, 0 },
};

/*
 * RF value list for RF2523
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg_2523[] = {
	{ 1,  0x00022010, 0x00000c9e, 0x000e0111, 0x00000a1b },
	{ 2,  0x00022010, 0x00000ca2, 0x000e0111, 0x00000a1b },
	{ 3,  0x00022010, 0x00000ca6, 0x000e0111, 0x00000a1b },
	{ 4,  0x00022010, 0x00000caa, 0x000e0111, 0x00000a1b },
	{ 5,  0x00022010, 0x00000cae, 0x000e0111, 0x00000a1b },
	{ 6,  0x00022010, 0x00000cb2, 0x000e0111, 0x00000a1b },
	{ 7,  0x00022010, 0x00000cb6, 0x000e0111, 0x00000a1b },
	{ 8,  0x00022010, 0x00000cba, 0x000e0111, 0x00000a1b },
	{ 9,  0x00022010, 0x00000cbe, 0x000e0111, 0x00000a1b },
	{ 10,