Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[mirror_ubuntu-artful-kernel.git] / drivers / net / wireless / rt2x00 / rt2400pci.c

/*
        Copyright (C) 2004 - 2008 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: rt2400pci
        Abstract: rt2400pci device specific routines.
        Supported chipsets: RT2460.
 */

#include <linux/delay.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/eeprom_93cx6.h>

#include "rt2x00.h"
#include "rt2x00pci.h"
#include "rt2400pci.h"

/*
 * Register access.
 * All access to the CSR registers will go through the methods
 * rt2x00pci_register_read and rt2x00pci_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.
 */
static u32 rt2400pci_bbp_check(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;
        unsigned int i;

        for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
                rt2x00pci_register_read(rt2x00dev, BBPCSR, &reg);
                if (!rt2x00_get_field32(reg, BBPCSR_BUSY))
                        break;
                udelay(REGISTER_BUSY_DELAY);
        }

        return reg;
}

static void rt2400pci_bbp_write(struct rt2x00_dev *rt2x00dev,
                                const unsigned int word, const u8 value)
{
        u32 reg;

        /*
         * Wait until the BBP becomes ready.
         */
        reg = rt2400pci_bbp_check(rt2x00dev);
        if (rt2x00_get_field32(reg, BBPCSR_BUSY)) {
                ERROR(rt2x00dev, "BBPCSR register busy. Write failed.\n");
                return;
        }

        /*
         * Write the data into the BBP.
         */
        reg = 0;
        rt2x00_set_field32(&reg, BBPCSR_VALUE, value);
        rt2x00_set_field32(&reg, BBPCSR_REGNUM, word);
        rt2x00_set_field32(&reg, BBPCSR_BUSY, 1);
        rt2x00_set_field32(&reg, BBPCSR_WRITE_CONTROL, 1);

        rt2x00pci_register_write(rt2x00dev, BBPCSR, reg);
}

static void rt2400pci_bbp_read(struct rt2x00_dev *rt2x00dev,
                               const unsigned int word, u8 *value)
{
        u32 reg;

        /*
         * Wait until the BBP becomes ready.
         */
        reg = rt2400pci_bbp_check(rt2x00dev);
        if (rt2x00_get_field32(reg, BBPCSR_BUSY)) {
                ERROR(rt2x00dev, "BBPCSR register busy. Read failed.\n");
                return;
        }

        /*
         * Write the request into the BBP.
         */
        reg = 0;
        rt2x00_set_field32(&reg, BBPCSR_REGNUM, word);
        rt2x00_set_field32(&reg, BBPCSR_BUSY, 1);
        rt2x00_set_field32(&reg, BBPCSR_WRITE_CONTROL, 0);

        rt2x00pci_register_write(rt2x00dev, BBPCSR, reg);

        /*
         * Wait until the BBP becomes ready.
         */
        reg = rt2400pci_bbp_check(rt2x00dev);
        if (rt2x00_get_field32(reg, BBPCSR_BUSY)) {
                ERROR(rt2x00dev, "BBPCSR register busy. Read failed.\n");
                *value = 0xff;
                return;
        }

        *value = rt2x00_get_field32(reg, BBPCSR_VALUE);
}

static void rt2400pci_rf_write(struct rt2x00_dev *rt2x00dev,
                               const unsigned int word, const u32 value)
{
        u32 reg;
        unsigned int i;

        if (!word)
                return;

        for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
                rt2x00pci_register_read(rt2x00dev, RFCSR, &reg);
                if (!rt2x00_get_field32(reg, RFCSR_BUSY))
                        goto rf_write;
                udelay(REGISTER_BUSY_DELAY);
        }

        ERROR(rt2x00dev, "RFCSR register busy. Write failed.\n");
        return;

rf_write:
        reg = 0;
        rt2x00_set_field32(&reg, RFCSR_VALUE, value);
        rt2x00_set_field32(&reg, RFCSR_NUMBER_OF_BITS, 20);
        rt2x00_set_field32(&reg, RFCSR_IF_SELECT, 0);
        rt2x00_set_field32(&reg, RFCSR_BUSY, 1);

        rt2x00pci_register_write(rt2x00dev, RFCSR, reg);
        rt2x00_rf_write(rt2x00dev, word, value);
}

static void rt2400pci_eepromregister_read(struct eeprom_93cx6 *eeprom)
{
        struct rt2x00_dev *rt2x00dev = eeprom->data;
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, CSR21, &reg);

        eeprom->reg_data_in = !!rt2x00_get_field32(reg, CSR21_EEPROM_DATA_IN);
        eeprom->reg_data_out = !!rt2x00_get_field32(reg, CSR21_EEPROM_DATA_OUT);
        eeprom->reg_data_clock =
            !!rt2x00_get_field32(reg, CSR21_EEPROM_DATA_CLOCK);
        eeprom->reg_chip_select =
            !!rt2x00_get_field32(reg, CSR21_EEPROM_CHIP_SELECT);
}

static void rt2400pci_eepromregister_write(struct eeprom_93cx6 *eeprom)
{
        struct rt2x00_dev *rt2x00dev = eeprom->data;
        u32 reg = 0;

        rt2x00_set_field32(&reg, CSR21_EEPROM_DATA_IN, !!eeprom->reg_data_in);
        rt2x00_set_field32(&reg, CSR21_EEPROM_DATA_OUT, !!eeprom->reg_data_out);
        rt2x00_set_field32(&reg, CSR21_EEPROM_DATA_CLOCK,
                           !!eeprom->reg_data_clock);
        rt2x00_set_field32(&reg, CSR21_EEPROM_CHIP_SELECT,
                           !!eeprom->reg_chip_select);

        rt2x00pci_register_write(rt2x00dev, CSR21, reg);
}

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

static void rt2400pci_read_csr(struct rt2x00_dev *rt2x00dev,
                               const unsigned int word, u32 *data)
{
        rt2x00pci_register_read(rt2x00dev, CSR_OFFSET(word), data);
}

static void rt2400pci_write_csr(struct rt2x00_dev *rt2x00dev,
                                const unsigned int word, u32 data)
{
        rt2x00pci_register_write(rt2x00dev, CSR_OFFSET(word), data);
}

static const struct rt2x00debug rt2400pci_rt2x00debug = {
        .owner  = THIS_MODULE,
        .csr    = {
                .read           = rt2400pci_read_csr,
                .write          = rt2400pci_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           = rt2400pci_bbp_read,
                .write          = rt2400pci_bbp_write,
                .word_size      = sizeof(u8),
                .word_count     = BBP_SIZE / sizeof(u8),
        },
        .rf     = {
                .read           = rt2x00_rf_read,
                .write          = rt2400pci_rf_write,
                .word_size      = sizeof(u32),
                .word_count     = RF_SIZE / sizeof(u32),
        },
};
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

#ifdef CONFIG_RT2400PCI_RFKILL
static int rt2400pci_rfkill_poll(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, GPIOCSR, &reg);
        return rt2x00_get_field32(reg, GPIOCSR_BIT0);
}
#else
#define rt2400pci_rfkill_poll   NULL
#endif /* CONFIG_RT2400PCI_RFKILL */

#ifdef CONFIG_RT2400PCI_LEDS
static void rt2400pci_led_brightness(struct led_classdev *led_cdev,
                                     enum led_brightness brightness)
{
        struct rt2x00_led *led =
            container_of(led_cdev, struct rt2x00_led, led_dev);
        unsigned int enabled = brightness != LED_OFF;
        unsigned int activity =
            led->rt2x00dev->led_flags & LED_SUPPORT_ACTIVITY;
        u32 reg;

        rt2x00pci_register_read(led->rt2x00dev, LEDCSR, &reg);

        if (led->type == LED_TYPE_RADIO || led->type == LED_TYPE_ASSOC) {
                rt2x00_set_field32(&reg, LEDCSR_LINK, enabled);
                rt2x00_set_field32(&reg, LEDCSR_ACTIVITY, enabled && activity);
        }

        rt2x00pci_register_write(led->rt2x00dev, LEDCSR, reg);
}
#else
#define rt2400pci_led_brightness        NULL
#endif /* CONFIG_RT2400PCI_LEDS */

/*
 * Configuration handlers.
 */
static void rt2400pci_config_intf(struct rt2x00_dev *rt2x00dev,
                                  struct rt2x00_intf *intf,
                                  struct rt2x00intf_conf *conf,
                                  const unsigned int flags)
{
        unsigned int bcn_preload;
        u32 reg;

        if (flags & CONFIG_UPDATE_TYPE) {
                /*
                 * Enable beacon config
                 */
                bcn_preload = PREAMBLE + get_duration(IEEE80211_HEADER, 20);
                rt2x00pci_register_read(rt2x00dev, BCNCSR1, &reg);
                rt2x00_set_field32(&reg, BCNCSR1_PRELOAD, bcn_preload);
                rt2x00pci_register_write(rt2x00dev, BCNCSR1, reg);

                /*
                 * Enable synchronisation.
                 */
                rt2x00pci_register_read(rt2x00dev, CSR14, &reg);
                rt2x00_set_field32(&reg, CSR14_TSF_COUNT, 1);
                rt2x00_set_field32(&reg, CSR14_TSF_SYNC, conf->sync);
                rt2x00_set_field32(&reg, CSR14_TBCN, 1);
                rt2x00pci_register_write(rt2x00dev, CSR14, reg);
        }

        if (flags & CONFIG_UPDATE_MAC)
                rt2x00pci_register_multiwrite(rt2x00dev, CSR3,
                                              conf->mac, sizeof(conf->mac));

        if (flags & CONFIG_UPDATE_BSSID)
                rt2x00pci_register_multiwrite(rt2x00dev, CSR5,
                                              conf->bssid, sizeof(conf->bssid));
}

static int rt2400pci_config_erp(struct rt2x00_dev *rt2x00dev,
                                struct rt2x00lib_erp *erp)
{
        int preamble_mask;
        u32 reg;

        /*
         * When short preamble is enabled, we should set bit 0x08
         */
        preamble_mask = erp->short_preamble << 3;

        rt2x00pci_register_read(rt2x00dev, TXCSR1, &reg);
        rt2x00_set_field32(&reg, TXCSR1_ACK_TIMEOUT,
                           erp->ack_timeout);
        rt2x00_set_field32(&reg, TXCSR1_ACK_CONSUME_TIME,
                           erp->ack_consume_time);
        rt2x00pci_register_write(rt2x00dev, TXCSR1, reg);

        rt2x00pci_register_read(rt2x00dev, ARCSR2, &reg);
        rt2x00_set_field32(&reg, ARCSR2_SIGNAL, 0x00 | preamble_mask);
        rt2x00_set_field32(&reg, ARCSR2_SERVICE, 0x04);
        rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 10));
        rt2x00pci_register_write(rt2x00dev, ARCSR2, reg);

        rt2x00pci_register_read(rt2x00dev, ARCSR3, &reg);
        rt2x00_set_field32(&reg, ARCSR3_SIGNAL, 0x01 | preamble_mask);
        rt2x00_set_field32(&reg, ARCSR3_SERVICE, 0x04);
        rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 20));
        rt2x00pci_register_write(rt2x00dev, ARCSR3, reg);

        rt2x00pci_register_read(rt2x00dev, ARCSR4, &reg);
        rt2x00_set_field32(&reg, ARCSR4_SIGNAL, 0x02 | preamble_mask);
        rt2x00_set_field32(&reg, ARCSR4_SERVICE, 0x04);
        rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 55));
        rt2x00pci_register_write(rt2x00dev, ARCSR4, reg);

        rt2x00pci_register_read(rt2x00dev, ARCSR5, &reg);
        rt2x00_set_field32(&reg, ARCSR5_SIGNAL, 0x03 | preamble_mask);
        rt2x00_set_field32(&reg, ARCSR5_SERVICE, 0x84);
        rt2x00_set_field32(&reg, ARCSR2_LENGTH, get_duration(ACK_SIZE, 110));
        rt2x00pci_register_write(rt2x00dev, ARCSR5, reg);

        return 0;
}

static void rt2400pci_config_phymode(struct rt2x00_dev *rt2x00dev,
                                     const int basic_rate_mask)
{
        rt2x00pci_register_write(rt2x00dev, ARCSR1, basic_rate_mask);
}

static void rt2400pci_config_channel(struct rt2x00_dev *rt2x00dev,
                                     struct rf_channel *rf)
{
        /*
         * Switch on tuning bits.
         */
        rt2x00_set_field32(&rf->rf1, RF1_TUNER, 1);
        rt2x00_set_field32(&rf->rf3, RF3_TUNER, 1);

        rt2400pci_rf_write(rt2x00dev, 1, rf->rf1);
        rt2400pci_rf_write(rt2x00dev, 2, rf->rf2);
        rt2400pci_rf_write(rt2x00dev, 3, rf->rf3);

        /*
         * RF2420 chipset don't need any additional actions.
         */
        if (rt2x00_rf(&rt2x00dev->chip, RF2420))
                return;

        /*
         * For the RT2421 chipsets we need to write an invalid
         * reference clock rate to activate auto_tune.
         * After that we set the value back to the correct channel.
         */
        rt2400pci_rf_write(rt2x00dev, 1, rf->rf1);
        rt2400pci_rf_write(rt2x00dev, 2, 0x000c2a32);
        rt2400pci_rf_write(rt2x00dev, 3, rf->rf3);

        msleep(1);

        rt2400pci_rf_write(rt2x00dev, 1, rf->rf1);
        rt2400pci_rf_write(rt2x00dev, 2, rf->rf2);
        rt2400pci_rf_write(rt2x00dev, 3, rf->rf3);

        msleep(1);

        /*
         * Switch off tuning bits.
         */
        rt2x00_set_field32(&rf->rf1, RF1_TUNER, 0);
        rt2x00_set_field32(&rf->rf3, RF3_TUNER, 0);

        rt2400pci_rf_write(rt2x00dev, 1, rf->rf1);
        rt2400pci_rf_write(rt2x00dev, 3, rf->rf3);

        /*
         * Clear false CRC during channel switch.
         */
        rt2x00pci_register_read(rt2x00dev, CNT0, &rf->rf1);
}

static void rt2400pci_config_txpower(struct rt2x00_dev *rt2x00dev, int txpower)
{
        rt2400pci_bbp_write(rt2x00dev, 3, TXPOWER_TO_DEV(txpower));
}

static void rt2400pci_config_antenna(struct rt2x00_dev *rt2x00dev,
                                     struct antenna_setup *ant)
{
        u8 r1;
        u8 r4;

        /*
         * 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);

        rt2400pci_bbp_read(rt2x00dev, 4, &r4);
        rt2400pci_bbp_read(rt2x00dev, 1, &r1);

        /*
         * Configure the TX antenna.
         */
        switch (ant->tx) {
        case ANTENNA_HW_DIVERSITY:
                rt2x00_set_field8(&r1, BBP_R1_TX_ANTENNA, 1);
                break;
        case ANTENNA_A:
                rt2x00_set_field8(&r1, BBP_R1_TX_ANTENNA, 0);
                break;
        case ANTENNA_B:
        default:
                rt2x00_set_field8(&r1, BBP_R1_TX_ANTENNA, 2);
                break;
        }

        /*
         * Configure the RX antenna.
         */
        switch (ant->rx) {
        case ANTENNA_HW_DIVERSITY:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 1);
                break;
        case ANTENNA_A:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 0);
                break;
        case ANTENNA_B:
        default:
                rt2x00_set_field8(&r4, BBP_R4_RX_ANTENNA, 2);
                break;
        }

        rt2400pci_bbp_write(rt2x00dev, 4, r4);
        rt2400pci_bbp_write(rt2x00dev, 1, r1);
}

static void rt2400pci_config_duration(struct rt2x00_dev *rt2x00dev,
                                      struct rt2x00lib_conf *libconf)
{
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, CSR11, &reg);
        rt2x00_set_field32(&reg, CSR11_SLOT_TIME, libconf->slot_time);
        rt2x00pci_register_write(rt2x00dev, CSR11, reg);

        rt2x00pci_register_read(rt2x00dev, CSR18, &reg);
        rt2x00_set_field32(&reg, CSR18_SIFS, libconf->sifs);
        rt2x00_set_field32(&reg, CSR18_PIFS, libconf->pifs);
        rt2x00pci_register_write(rt2x00dev, CSR18, reg);

        rt2x00pci_register_read(rt2x00dev, CSR19, &reg);
        rt2x00_set_field32(&reg, CSR19_DIFS, libconf->difs);
        rt2x00_set_field32(&reg, CSR19_EIFS, libconf->eifs);
        rt2x00pci_register_write(rt2x00dev, CSR19, reg);

        rt2x00pci_register_read(rt2x00dev, TXCSR1, &reg);
        rt2x00_set_field32(&reg, TXCSR1_TSF_OFFSET, IEEE80211_HEADER);
        rt2x00_set_field32(&reg, TXCSR1_AUTORESPONDER, 1);
        rt2x00pci_register_write(rt2x00dev, TXCSR1, reg);

        rt2x00pci_register_read(rt2x00dev, CSR12, &reg);
        rt2x00_set_field32(&reg, CSR12_BEACON_INTERVAL,
                           libconf->conf->beacon_int * 16);
        rt2x00_set_field32(&reg, CSR12_CFP_MAX_DURATION,
                           libconf->conf->beacon_int * 16);
        rt2x00pci_register_write(rt2x00dev, CSR12, reg);
}

static void rt2400pci_config(struct rt2x00_dev *rt2x00dev,
                             struct rt2x00lib_conf *libconf,
                             const unsigned int flags)
{
        if (flags & CONFIG_UPDATE_PHYMODE)
                rt2400pci_config_phymode(rt2x00dev, libconf->basic_rates);
        if (flags & CONFIG_UPDATE_CHANNEL)
                rt2400pci_config_channel(rt2x00dev, &libconf->rf);
        if (flags & CONFIG_UPDATE_TXPOWER)
                rt2400pci_config_txpower(rt2x00dev,
                                         libconf->conf->power_level);
        if (flags & CONFIG_UPDATE_ANTENNA)
                rt2400pci_config_antenna(rt2x00dev, &libconf->ant);
        if (flags & (CONFIG_UPDATE_SLOT_TIME | CONFIG_UPDATE_BEACON_INT))
                rt2400pci_config_duration(rt2x00dev, libconf);
}

static void rt2400pci_config_cw(struct rt2x00_dev *rt2x00dev,
                                const int cw_min, const int cw_max)
{
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, CSR11, &reg);
        rt2x00_set_field32(&reg, CSR11_CWMIN, cw_min);
        rt2x00_set_field32(&reg, CSR11_CWMAX, cw_max);
        rt2x00pci_register_write(rt2x00dev, CSR11, reg);
}

/*
 * Link tuning
 */
static void rt2400pci_link_stats(struct rt2x00_dev *rt2x00dev,
                                 struct link_qual *qual)
{
        u32 reg;
        u8 bbp;

        /*
         * Update FCS error count from register.
         */
        rt2x00pci_register_read(rt2x00dev, CNT0, &reg);
        qual->rx_failed = rt2x00_get_field32(reg, CNT0_FCS_ERROR);

        /*
         * Update False CCA count from register.
         */
        rt2400pci_bbp_read(rt2x00dev, 39, &bbp);
        qual->false_cca = bbp;
}

static void rt2400pci_reset_tuner(struct rt2x00_dev *rt2x00dev)
{
        rt2400pci_bbp_write(rt2x00dev, 13, 0x08);
        rt2x00dev->link.vgc_level = 0x08;
}

static void rt2400pci_link_tuner(struct rt2x00_dev *rt2x00dev)
{
        u8 reg;

        /*
         * The link tuner should not run longer then 60 seconds,
         * and should run once every 2 seconds.
         */
        if (rt2x00dev->link.count > 60 || !(rt2x00dev->link.count & 1))
                return;

        /*
         * Base r13 link tuning on the false cca count.
         */
        rt2400pci_bbp_read(rt2x00dev, 13, &reg);

        if (rt2x00dev->link.qual.false_cca > 512 && reg < 0x20) {
                rt2400pci_bbp_write(rt2x00dev, 13, ++reg);
                rt2x00dev->link.vgc_level = reg;
        } else if (rt2x00dev->link.qual.false_cca < 100 && reg > 0x08) {
                rt2400pci_bbp_write(rt2x00dev, 13, --reg);
                rt2x00dev->link.vgc_level = reg;
        }
}

/*
 * Initialization functions.
 */
static void rt2400pci_init_rxentry(struct rt2x00_dev *rt2x00dev,
                                   struct queue_entry *entry)
{
        struct queue_entry_priv_pci_rx *priv_rx = entry->priv_data;
        u32 word;

        rt2x00_desc_read(priv_rx->desc, 2, &word);
        rt2x00_set_field32(&word, RXD_W2_BUFFER_LENGTH,
                           entry->queue->data_size);
        rt2x00_desc_write(priv_rx->desc, 2, word);

        rt2x00_desc_read(priv_rx->desc, 1, &word);
        rt2x00_set_field32(&word, RXD_W1_BUFFER_ADDRESS, priv_rx->data_dma);
        rt2x00_desc_write(priv_rx->desc, 1, word);

        rt2x00_desc_read(priv_rx->desc, 0, &word);
        rt2x00_set_field32(&word, RXD_W0_OWNER_NIC, 1);
        rt2x00_desc_write(priv_rx->desc, 0, word);
}

static void rt2400pci_init_txentry(struct rt2x00_dev *rt2x00dev,
                                   struct queue_entry *entry)
{
        struct queue_entry_priv_pci_tx *priv_tx = entry->priv_data;
        u32 word;

        rt2x00_desc_read(priv_tx->desc, 1, &word);
        rt2x00_set_field32(&word, TXD_W1_BUFFER_ADDRESS, priv_tx->data_dma);
        rt2x00_desc_write(priv_tx->desc, 1, word);

        rt2x00_desc_read(priv_tx->desc, 2, &word);
        rt2x00_set_field32(&word, TXD_W2_BUFFER_LENGTH,
                           entry->queue->data_size);
        rt2x00_desc_write(priv_tx->desc, 2, word);

        rt2x00_desc_read(priv_tx->desc, 0, &word);
        rt2x00_set_field32(&word, TXD_W0_VALID, 0);
        rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 0);
        rt2x00_desc_write(priv_tx->desc, 0, word);
}

static int rt2400pci_init_queues(struct rt2x00_dev *rt2x00dev)
{
        struct queue_entry_priv_pci_rx *priv_rx;
        struct queue_entry_priv_pci_tx *priv_tx;
        u32 reg;

        /*
         * Initialize registers.
         */
        rt2x00pci_register_read(rt2x00dev, TXCSR2, &reg);
        rt2x00_set_field32(&reg, TXCSR2_TXD_SIZE, rt2x00dev->tx[0].desc_size);
        rt2x00_set_field32(&reg, TXCSR2_NUM_TXD, rt2x00dev->tx[1].limit);
        rt2x00_set_field32(&reg, TXCSR2_NUM_ATIM, rt2x00dev->bcn[1].limit);
        rt2x00_set_field32(&reg, TXCSR2_NUM_PRIO, rt2x00dev->tx[0].limit);
        rt2x00pci_register_write(rt2x00dev, TXCSR2, reg);

        priv_tx = rt2x00dev->tx[1].entries[0].priv_data;
        rt2x00pci_register_read(rt2x00dev, TXCSR3, &reg);
        rt2x00_set_field32(&reg, TXCSR3_TX_RING_REGISTER,
                           priv_tx->desc_dma);
        rt2x00pci_register_write(rt2x00dev, TXCSR3, reg);

        priv_tx = rt2x00dev->tx[0].entries[0].priv_data;
        rt2x00pci_register_read(rt2x00dev, TXCSR5, &reg);
        rt2x00_set_field32(&reg, TXCSR5_PRIO_RING_REGISTER,
                           priv_tx->desc_dma);
        rt2x00pci_register_write(rt2x00dev, TXCSR5, reg);

        priv_tx = rt2x00dev->bcn[1].entries[0].priv_data;
        rt2x00pci_register_read(rt2x00dev, TXCSR4, &reg);
        rt2x00_set_field32(&reg, TXCSR4_ATIM_RING_REGISTER,
                           priv_tx->desc_dma);
        rt2x00pci_register_write(rt2x00dev, TXCSR4, reg);

        priv_tx = rt2x00dev->bcn[0].entries[0].priv_data;
        rt2x00pci_register_read(rt2x00dev, TXCSR6, &reg);
        rt2x00_set_field32(&reg, TXCSR6_BEACON_RING_REGISTER,
                           priv_tx->desc_dma);
        rt2x00pci_register_write(rt2x00dev, TXCSR6, reg);

        rt2x00pci_register_read(rt2x00dev, RXCSR1, &reg);
        rt2x00_set_field32(&reg, RXCSR1_RXD_SIZE, rt2x00dev->rx->desc_size);
        rt2x00_set_field32(&reg, RXCSR1_NUM_RXD, rt2x00dev->rx->limit);
        rt2x00pci_register_write(rt2x00dev, RXCSR1, reg);

        priv_rx = rt2x00dev->rx->entries[0].priv_data;
        rt2x00pci_register_read(rt2x00dev, RXCSR2, &reg);
        rt2x00_set_field32(&reg, RXCSR2_RX_RING_REGISTER, priv_rx->desc_dma);
        rt2x00pci_register_write(rt2x00dev, RXCSR2, reg);

        return 0;
}

static int rt2400pci_init_registers(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;

        rt2x00pci_register_write(rt2x00dev, PSCSR0, 0x00020002);
        rt2x00pci_register_write(rt2x00dev, PSCSR1, 0x00000002);
        rt2x00pci_register_write(rt2x00dev, PSCSR2, 0x00023f20);
        rt2x00pci_register_write(rt2x00dev, PSCSR3, 0x00000002);

        rt2x00pci_register_read(rt2x00dev, TIMECSR, &reg);
        rt2x00_set_field32(&reg, TIMECSR_US_COUNT, 33);
        rt2x00_set_field32(&reg, TIMECSR_US_64_COUNT, 63);
        rt2x00_set_field32(&reg, TIMECSR_BEACON_EXPECT, 0);
        rt2x00pci_register_write(rt2x00dev, TIMECSR, reg);

        rt2x00pci_register_read(rt2x00dev, CSR9, &reg);
        rt2x00_set_field32(&reg, CSR9_MAX_FRAME_UNIT,
                           (rt2x00dev->rx->data_size / 128));
        rt2x00pci_register_write(rt2x00dev, CSR9, reg);

        rt2x00pci_register_read(rt2x00dev, LEDCSR, &reg);
        rt2x00_set_field32(&reg, LEDCSR_ON_PERIOD, 70);
        rt2x00_set_field32(&reg, LEDCSR_OFF_PERIOD, 30);
        rt2x00pci_register_write(rt2x00dev, LEDCSR, reg);

        rt2x00pci_register_write(rt2x00dev, CNT3, 0x3f080000);

        rt2x00pci_register_read(rt2x00dev, ARCSR0, &reg);
        rt2x00_set_field32(&reg, ARCSR0_AR_BBP_DATA0, 133);
        rt2x00_set_field32(&reg, ARCSR0_AR_BBP_ID0, 134);
        rt2x00_set_field32(&reg, ARCSR0_AR_BBP_DATA1, 136);
        rt2x00_set_field32(&reg, ARCSR0_AR_BBP_ID1, 135);
        rt2x00pci_register_write(rt2x00dev, ARCSR0, reg);

        rt2x00pci_register_read(rt2x00dev, RXCSR3, &reg);
        rt2x00_set_field32(&reg, RXCSR3_BBP_ID0, 3); /* Tx power.*/
        rt2x00_set_field32(&reg, RXCSR3_BBP_ID0_VALID, 1);
        rt2x00_set_field32(&reg, RXCSR3_BBP_ID1, 32); /* Signal */
        rt2x00_set_field32(&reg, RXCSR3_BBP_ID1_VALID, 1);
        rt2x00_set_field32(&reg, RXCSR3_BBP_ID2, 36); /* Rssi */
        rt2x00_set_field32(&reg, RXCSR3_BBP_ID2_VALID, 1);
        rt2x00pci_register_write(rt2x00dev, RXCSR3, reg);

        rt2x00pci_register_write(rt2x00dev, PWRCSR0, 0x3f3b3100);

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

        rt2x00pci_register_write(rt2x00dev, MACCSR0, 0x00217223);
        rt2x00pci_register_write(rt2x00dev, MACCSR1, 0x00235518);

        rt2x00pci_register_read(rt2x00dev, MACCSR2, &reg);
        rt2x00_set_field32(&reg, MACCSR2_DELAY, 64);
        rt2x00pci_register_write(rt2x00dev, MACCSR2, reg);

        rt2x00pci_register_read(rt2x00dev, RALINKCSR, &reg);
        rt2x00_set_field32(&reg, RALINKCSR_AR_BBP_DATA0, 17);
        rt2x00_set_field32(&reg, RALINKCSR_AR_BBP_ID0, 154);
        rt2x00_set_field32(&reg, RALINKCSR_AR_BBP_DATA1, 0);
        rt2x00_set_field32(&reg, RALINKCSR_AR_BBP_ID1, 154);
        rt2x00pci_register_write(rt2x00dev, RALINKCSR, reg);

        rt2x00pci_register_read(rt2x00dev, CSR1, &reg);
        rt2x00_set_field32(&reg, CSR1_SOFT_RESET, 1);
        rt2x00_set_field32(&reg, CSR1_BBP_RESET, 0);
        rt2x00_set_field32(&reg, CSR1_HOST_READY, 0);
        rt2x00pci_register_write(rt2x00dev, CSR1, reg);

        rt2x00pci_register_read(rt2x00dev, CSR1, &reg);
        rt2x00_set_field32(&reg, CSR1_SOFT_RESET, 0);
        rt2x00_set_field32(&reg, CSR1_HOST_READY, 1);
        rt2x00pci_register_write(rt2x00dev, CSR1, reg);

        /*
         * We must clear the FCS and FIFO error count.
         * These registers are cleared on read,
         * so we may pass a useless variable to store the value.
         */
        rt2x00pci_register_read(rt2x00dev, CNT0, &reg);
        rt2x00pci_register_read(rt2x00dev, CNT4, &reg);

        return 0;
}

static int rt2400pci_init_bbp(struct rt2x00_dev *rt2x00dev)
{
        unsigned int i;
        u16 eeprom;
        u8 reg_id;
        u8 value;

        for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
                rt2400pci_bbp_read(rt2x00dev, 0, &value);
                if ((value != 0xff) && (value != 0x00))
                        goto continue_csr_init;
                NOTICE(rt2x00dev, "Waiting for BBP register.\n");
                udelay(REGISTER_BUSY_DELAY);
        }

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

continue_csr_init:
        rt2400pci_bbp_write(rt2x00dev, 1, 0x00);
        rt2400pci_bbp_write(rt2x00dev, 3, 0x27);
        rt2400pci_bbp_write(rt2x00dev, 4, 0x08);
        rt2400pci_bbp_write(rt2x00dev, 10, 0x0f);
        rt2400pci_bbp_write(rt2x00dev, 15, 0x72);
        rt2400pci_bbp_write(rt2x00dev, 16, 0x74);
        rt2400pci_bbp_write(rt2x00dev, 17, 0x20);
        rt2400pci_bbp_write(rt2x00dev, 18, 0x72);
        rt2400pci_bbp_write(rt2x00dev, 19, 0x0b);
        rt2400pci_bbp_write(rt2x00dev, 20, 0x00);
        rt2400pci_bbp_write(rt2x00dev, 28, 0x11);
        rt2400pci_bbp_write(rt2x00dev, 29, 0x04);
        rt2400pci_bbp_write(rt2x00dev, 30, 0x21);
        rt2400pci_bbp_write(rt2x00dev, 31, 0x00);

        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);
                        rt2400pci_bbp_write(rt2x00dev, reg_id, value);
                }
        }

        return 0;
}

/*
 * Device state switch handlers.
 */
static void rt2400pci_toggle_rx(struct rt2x00_dev *rt2x00dev,
                                enum dev_state state)
{
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, RXCSR0, &reg);
        rt2x00_set_field32(&reg, RXCSR0_DISABLE_RX,
                           state == STATE_RADIO_RX_OFF);
        rt2x00pci_register_write(rt2x00dev, RXCSR0, reg);
}

static void rt2400pci_toggle_irq(struct rt2x00_dev *rt2x00dev,
                                 enum dev_state state)
{
        int mask = (state == STATE_RADIO_IRQ_OFF);
        u32 reg;

        /*
         * When interrupts are being enabled, the interrupt registers
         * should clear the register to assure a clean state.
         */
        if (state == STATE_RADIO_IRQ_ON) {
                rt2x00pci_register_read(rt2x00dev, CSR7, &reg);
                rt2x00pci_register_write(rt2x00dev, CSR7, reg);
        }

        /*
         * Only toggle the interrupts bits we are going to use.
         * Non-checked interrupt bits are disabled by default.
         */
        rt2x00pci_register_read(rt2x00dev, CSR8, &reg);
        rt2x00_set_field32(&reg, CSR8_TBCN_EXPIRE, mask);
        rt2x00_set_field32(&reg, CSR8_TXDONE_TXRING, mask);
        rt2x00_set_field32(&reg, CSR8_TXDONE_ATIMRING, mask);
        rt2x00_set_field32(&reg, CSR8_TXDONE_PRIORING, mask);
        rt2x00_set_field32(&reg, CSR8_RXDONE, mask);
        rt2x00pci_register_write(rt2x00dev, CSR8, reg);
}

static int rt2400pci_enable_radio(struct rt2x00_dev *rt2x00dev)
{
        /*
         * Initialize all registers.
         */
        if (rt2400pci_init_queues(rt2x00dev) ||
            rt2400pci_init_registers(rt2x00dev) ||
            rt2400pci_init_bbp(rt2x00dev)) {
                ERROR(rt2x00dev, "Register initialization failed.\n");
                return -EIO;
        }

        /*
         * Enable interrupts.
         */
        rt2400pci_toggle_irq(rt2x00dev, STATE_RADIO_IRQ_ON);

        return 0;
}

static void rt2400pci_disable_radio(struct rt2x00_dev *rt2x00dev)
{
        u32 reg;

        rt2x00pci_register_write(rt2x00dev, PWRCSR0, 0);

        /*
         * Disable synchronisation.
         */
        rt2x00pci_register_write(rt2x00dev, CSR14, 0);

        /*
         * Cancel RX and TX.
         */
        rt2x00pci_register_read(rt2x00dev, TXCSR0, &reg);
        rt2x00_set_field32(&reg, TXCSR0_ABORT, 1);
        rt2x00pci_register_write(rt2x00dev, TXCSR0, reg);

        /*
         * Disable interrupts.
         */
        rt2400pci_toggle_irq(rt2x00dev, STATE_RADIO_IRQ_OFF);
}

static int rt2400pci_set_state(struct rt2x00_dev *rt2x00dev,
                               enum dev_state state)
{
        u32 reg;
        unsigned int i;
        char put_to_sleep;
        char bbp_state;
        char rf_state;

        put_to_sleep = (state != STATE_AWAKE);

        rt2x00pci_register_read(rt2x00dev, PWRCSR1, &reg);
        rt2x00_set_field32(&reg, PWRCSR1_SET_STATE, 1);
        rt2x00_set_field32(&reg, PWRCSR1_BBP_DESIRE_STATE, state);
        rt2x00_set_field32(&reg, PWRCSR1_RF_DESIRE_STATE, state);
        rt2x00_set_field32(&reg, PWRCSR1_PUT_TO_SLEEP, put_to_sleep);
        rt2x00pci_register_write(rt2x00dev, PWRCSR1, 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++) {
                rt2x00pci_register_read(rt2x00dev, PWRCSR1, &reg);
                bbp_state = rt2x00_get_field32(reg, PWRCSR1_BBP_CURR_STATE);
                rf_state = rt2x00_get_field32(reg, PWRCSR1_RF_CURR_STATE);
                if (bbp_state == state && rf_state == state)
                        return 0;
                msleep(10);
        }

        NOTICE(rt2x00dev, "Device failed to enter state %d, "
               "current device state: bbp %d and rf %d.\n",
               state, bbp_state, rf_state);

        return -EBUSY;
}

static int rt2400pci_set_device_state(struct rt2x00_dev *rt2x00dev,
                                      enum dev_state state)
{
        int retval = 0;

        switch (state) {
        case STATE_RADIO_ON:
                retval = rt2400pci_enable_radio(rt2x00dev);
                break;
        case STATE_RADIO_OFF:
                rt2400pci_disable_radio(rt2x00dev);
                break;
        case STATE_RADIO_RX_ON:
        case STATE_RADIO_RX_ON_LINK:
                rt2400pci_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);
                break;
        case STATE_RADIO_RX_OFF:
        case STATE_RADIO_RX_OFF_LINK:
                rt2400pci_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);
                break;
        case STATE_DEEP_SLEEP:
        case STATE_SLEEP:
        case STATE_STANDBY:
        case STATE_AWAKE:
                retval = rt2400pci_set_state(rt2x00dev, state);
                break;
        default:
                retval = -ENOTSUPP;
                break;
        }

        return retval;
}

/*
 * TX descriptor initialization
 */
static void rt2400pci_write_tx_desc(struct rt2x00_dev *rt2x00dev,
                                    struct sk_buff *skb,
                                    struct txentry_desc *txdesc,
                                    struct ieee80211_tx_control *control)
{
        struct skb_frame_desc *skbdesc = get_skb_frame_desc(skb);
        __le32 *txd = skbdesc->desc;
        u32 word;

        /*
         * Start writing the descriptor words.
         */
        rt2x00_desc_read(txd, 2, &word);
        rt2x00_set_field32(&word, TXD_W2_DATABYTE_COUNT, skbdesc->data_len);
        rt2x00_desc_write(txd, 2, word);

        rt2x00_desc_read(txd, 3, &word);
        rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL, txdesc->signal);
        rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL_REGNUM, 5);
        rt2x00_set_field32(&word, TXD_W3_PLCP_SIGNAL_BUSY, 1);
        rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE, txdesc->service);
        rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE_REGNUM, 6);
        rt2x00_set_field32(&word, TXD_W3_PLCP_SERVICE_BUSY, 1);
        rt2x00_desc_write(txd, 3, word);

        rt2x00_desc_read(txd, 4, &word);
        rt2x00_set_field32(&word, TXD_W4_PLCP_LENGTH_LOW, txdesc->length_low);
        rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_LOW_REGNUM, 8);
        rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_LOW_BUSY, 1);
        rt2x00_set_field32(&word, TXD_W4_PLCP_LENGTH_HIGH, txdesc->length_high);
        rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_HIGH_REGNUM, 7);
        rt2x00_set_field32(&word, TXD_W3_PLCP_LENGTH_HIGH_BUSY, 1);
        rt2x00_desc_write(txd, 4, word);

        rt2x00_desc_read(txd, 0, &word);
        rt2x00_set_field32(&word, TXD_W0_OWNER_NIC, 1);
        rt2x00_set_field32(&word, TXD_W0_VALID, 1);
        rt2x00_set_field32(&word, TXD_W0_MORE_FRAG,
                           test_bit(ENTRY_TXD_MORE_FRAG, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_ACK,
                           test_bit(ENTRY_TXD_ACK, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_TIMESTAMP,
                           test_bit(ENTRY_TXD_REQ_TIMESTAMP, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_RTS,
                           test_bit(ENTRY_TXD_RTS_FRAME, &txdesc->flags));
        rt2x00_set_field32(&word, TXD_W0_IFS, txdesc->ifs);
        rt2x00_set_field32(&word, TXD_W0_RETRY_MODE,
                           !!(control->flags &
                              IEEE80211_TXCTL_LONG_RETRY_LIMIT));
        rt2x00_desc_write(txd, 0, word);
}

/*
 * TX data initialization
 */
static void rt2400pci_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
                                    const unsigned int queue)
{
        u32 reg;

        if (queue == RT2X00_BCN_QUEUE_BEACON) {
                rt2x00pci_register_read(rt2x00dev, CSR14, &reg);
                if (!rt2x00_get_field32(reg, CSR14_BEACON_GEN)) {
                        rt2x00_set_field32(&reg, CSR14_TSF_COUNT, 1);
                        rt2x00_set_field32(&reg, CSR14_TBCN, 1);
                        rt2x00_set_field32(&reg, CSR14_BEACON_GEN, 1);
                        rt2x00pci_register_write(rt2x00dev, CSR14, reg);
                }
                return;
        }

        rt2x00pci_register_read(rt2x00dev, TXCSR0, &reg);
        rt2x00_set_field32(&reg, TXCSR0_KICK_PRIO,
                           (queue == IEEE80211_TX_QUEUE_DATA0));
        rt2x00_set_field32(&reg, TXCSR0_KICK_TX,
                           (queue == IEEE80211_TX_QUEUE_DATA1));
        rt2x00_set_field32(&reg, TXCSR0_KICK_ATIM,
                           (queue == RT2X00_BCN_QUEUE_ATIM));
        rt2x00pci_register_write(rt2x00dev, TXCSR0, reg);
}

/*
 * RX control handlers
 */
static void rt2400pci_fill_rxdone(struct queue_entry *entry,
                                  struct rxdone_entry_desc *rxdesc)
{
        struct queue_entry_priv_pci_rx *priv_rx = entry->priv_data;
        u32 word0;
        u32 word2;
        u32 word3;

        rt2x00_desc_read(priv_rx->desc, 0, &word0);
        rt2x00_desc_read(priv_rx->desc, 2, &word2);
        rt2x00_desc_read(priv_rx->desc, 3, &word3);

        rxdesc->flags = 0;
        if (rt2x00_get_field32(word0, RXD_W0_CRC_ERROR))
                rxdesc->flags |= RX_FLAG_FAILED_FCS_CRC;
        if (rt2x00_get_field32(word0, RXD_W0_PHYSICAL_ERROR))
                rxdesc->flags |= RX_FLAG_FAILED_PLCP_CRC;

        /*
         * Obtain the status about this packet.
         * The signal is the PLCP value, and needs to be stripped
         * of the preamble bit (0x08).
         */
        rxdesc->signal = rt2x00_get_field32(word2, RXD_W2_SIGNAL) & ~0x08;
        rxdesc->signal_plcp = 1;
        rxdesc->rssi = rt2x00_get_field32(word2, RXD_W3_RSSI) -
            entry->queue->rt2x00dev->rssi_offset;
        rxdesc->ofdm = 0;
        rxdesc->size = rt2x00_get_field32(word0, RXD_W0_DATABYTE_COUNT);
        rxdesc->my_bss = !!rt2x00_get_field32(word0, RXD_W0_MY_BSS);
}

/*
 * Interrupt functions.
 */
static void rt2400pci_txdone(struct rt2x00_dev *rt2x00dev,
                             const enum ieee80211_tx_queue queue_idx)
{
        struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, queue_idx);
        struct queue_entry_priv_pci_tx *priv_tx;
        struct queue_entry *entry;
        struct txdone_entry_desc txdesc;
        u32 word;

        while (!rt2x00queue_empty(queue)) {
                entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
                priv_tx = entry->priv_data;
                rt2x00_desc_read(priv_tx->desc, 0, &word);

                if (rt2x00_get_field32(word, TXD_W0_OWNER_NIC) ||
                    !rt2x00_get_field32(word, TXD_W0_VALID))
                        break;

                /*
                 * Obtain the status about this packet.
                 */
                txdesc.status = rt2x00_get_field32(word, TXD_W0_RESULT);
                txdesc.retry = rt2x00_get_field32(word, TXD_W0_RETRY_COUNT);

                rt2x00pci_txdone(rt2x00dev, entry, &txdesc);
        }
}

static irqreturn_t rt2400pci_interrupt(int irq, void *dev_instance)
{
        struct rt2x00_dev *rt2x00dev = dev_instance;
        u32 reg;

        /*
         * Get the interrupt sources & saved to local variable.
         * Write register value back to clear pending interrupts.
         */
        rt2x00pci_register_read(rt2x00dev, CSR7, &reg);
        rt2x00pci_register_write(rt2x00dev, CSR7, reg);

        if (!reg)
                return IRQ_NONE;

        if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags))
                return IRQ_HANDLED;

        /*
         * Handle interrupts, walk through all bits
         * and run the tasks, the bits are checked in order of
         * priority.
         */

        /*
         * 1 - Beacon timer expired interrupt.
         */
        if (rt2x00_get_field32(reg, CSR7_TBCN_EXPIRE))
                rt2x00lib_beacondone(rt2x00dev);

        /*
         * 2 - Rx ring done interrupt.
         */
        if (rt2x00_get_field32(reg, CSR7_RXDONE))
                rt2x00pci_rxdone(rt2x00dev);

        /*
         * 3 - Atim ring transmit done interrupt.
         */
        if (rt2x00_get_field32(reg, CSR7_TXDONE_ATIMRING))
                rt2400pci_txdone(rt2x00dev, RT2X00_BCN_QUEUE_ATIM);

        /*
         * 4 - Priority ring transmit done interrupt.
         */
        if (rt2x00_get_field32(reg, CSR7_TXDONE_PRIORING))
                rt2400pci_txdone(rt2x00dev, IEEE80211_TX_QUEUE_DATA0);

        /*
         * 5 - Tx ring transmit done interrupt.
         */
        if (rt2x00_get_field32(reg, CSR7_TXDONE_TXRING))
                rt2400pci_txdone(rt2x00dev, IEEE80211_TX_QUEUE_DATA1);

        return IRQ_HANDLED;
}

/*
 * Device probe functions.
 */
static int rt2400pci_validate_eeprom(struct rt2x00_dev *rt2x00dev)
{
        struct eeprom_93cx6 eeprom;
        u32 reg;
        u16 word;
        u8 *mac;

        rt2x00pci_register_read(rt2x00dev, CSR21, &reg);

        eeprom.data = rt2x00dev;
        eeprom.register_read = rt2400pci_eepromregister_read;
        eeprom.register_write = rt2400pci_eepromregister_write;
        eeprom.width = rt2x00_get_field32(reg, CSR21_TYPE_93C46) ?
            PCI_EEPROM_WIDTH_93C46 : PCI_EEPROM_WIDTH_93C66;
        eeprom.reg_data_in = 0;
        eeprom.reg_data_out = 0;
        eeprom.reg_data_clock = 0;
        eeprom.reg_chip_select = 0;

        eeprom_93cx6_multiread(&eeprom, EEPROM_BASE, rt2x00dev->eeprom,
                               EEPROM_SIZE / sizeof(u16));

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

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

        rt2x00_eeprom_read(rt2x00dev, EEPROM_ANTENNA, &word);
        if (word == 0xffff) {
                ERROR(rt2x00dev, "Invalid EEPROM data detected.\n");
                return -EINVAL;
        }

        return 0;
}

static int rt2400pci_init_eeprom(struct rt2x00_dev *rt2x00dev)
{
        u32 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);
        rt2x00pci_register_read(rt2x00dev, CSR0, &reg);
        rt2x00_set_chip(rt2x00dev, RT2460, value, reg);

        if (!rt2x00_rf(&rt2x00dev->chip, RF2420) &&
            !rt2x00_rf(&rt2x00dev->chip, RF2421)) {
                ERROR(rt2x00dev, "Invalid RF chipset detected.\n");
                return -ENODEV;
        }

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

        /*
         * 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;

        /*
         * Store led mode, for correct led behaviour.
         */
#ifdef CONFIG_RT2400PCI_LEDS
        value = rt2x00_get_field16(eeprom, EEPROM_ANTENNA_LED_MODE);

        switch (value) {
        case LED_MODE_ASUS:
        case LED_MODE_ALPHA:
        case LED_MODE_DEFAULT:
                rt2x00dev->led_flags = LED_SUPPORT_RADIO;
                break;
        case LED_MODE_TXRX_ACTIVITY:
                rt2x00dev->led_flags =
                    LED_SUPPORT_RADIO | LED_SUPPORT_ACTIVITY;
                break;
        case LED_MODE_SIGNAL_STRENGTH:
                rt2x00dev->led_flags = LED_SUPPORT_RADIO;
                break;
        }
#endif /* CONFIG_RT2400PCI_LEDS */

        /*
         * Detect if this device has an hardware controlled radio.
         */
#ifdef CONFIG_RT2400PCI_RFKILL
        if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_HARDWARE_RADIO))
                __set_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags);
#endif /* CONFIG_RT2400PCI_RFKILL */

        /*
         * Check if the BBP tuning should be enabled.
         */
        if (!rt2x00_get_field16(eeprom, EEPROM_ANTENNA_RX_AGCVGC_TUNING))
                __set_bit(CONFIG_DISABLE_LINK_TUNING, &rt2x00dev->flags);

        return 0;
}

/*
 * RF value list for RF2420 & RF2421
 * Supports: 2.4 GHz
 */
static const struct rf_channel rf_vals_bg[] = {
        { 1,  0x00022058, 0x000c1fda, 0x00000101, 0 },
        { 2,  0x00022058, 0x000c1fee, 0x00000101, 0 },
        { 3,  0x00022058, 0x000c2002, 0x00000101, 0 },
        { 4,  0x00022058, 0x000c2016, 0x00000101, 0 },
        { 5,  0x00022058, 0x000c202a, 0x00000101, 0 },
        { 6,  0x00022058, 0x000c203e, 0x00000101, 0 },
        { 7,  0x00022058, 0x000c2052, 0x00000101, 0 },
        { 8,  0x00022058, 0x000c2066, 0x00000101, 0 },
        { 9,  0x00022058, 0x000c207a, 0x00000101, 0 },
        { 10, 0x00022058, 0x000c208e, 0x00000101, 0 },
        { 11, 0x00022058, 0x000c20a2, 0x00000101, 0 },
        { 12, 0x00022058, 0x000c20b6, 0x00000101, 0 },
        { 13, 0x00022058, 0x000c20ca, 0x00000101, 0 },
        { 14, 0x00022058, 0x000c20fa, 0x00000101, 0 },
};

static void rt2400pci_probe_hw_mode(struct rt2x00_dev *rt2x00dev)
{
        struct hw_mode_spec *spec = &rt2x00dev->spec;
        u8 *txpower;
        unsigned int i;

        /*
         * Initialize all hw fields.
         */
        rt2x00dev->hw->flags = IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING;
        rt2x00dev->hw->extra_tx_headroom = 0;
        rt2x00dev->hw->max_signal = MAX_SIGNAL;
        rt2x00dev->hw->max_rssi = MAX_RX_SSI;
        rt2x00dev->hw->queues = 2;

        SET_IEEE80211_DEV(rt2x00dev->hw, &rt2x00dev_pci(rt2x00dev)->dev);
        SET_IEEE80211_PERM_ADDR(rt2x00dev->hw,
                                rt2x00_eeprom_addr(rt2x00dev,
                                                   EEPROM_MAC_ADDR_0));

        /*
         * Convert tx_power array in eeprom.
         */
        txpower = rt2x00_eeprom_addr(rt2x00dev, EEPROM_TXPOWER_START);
        for (i = 0; i < 14; i++)
                txpower[i] = TXPOWER_FROM_DEV(txpower[i]);

        /*
         * Initialize hw_mode information.
         */
        spec->supported_bands = SUPPORT_BAND_2GHZ;
        spec->supported_rates = SUPPORT_RATE_CCK;
        spec->tx_power_a = NULL;
        spec->tx_power_bg = txpower;
        spec->tx_power_default = DEFAULT_TXPOWER;

        spec->num_channels = ARRAY_SIZE(rf_vals_bg);
        spec->channels = rf_vals_bg;
}

static int rt2400pci_probe_hw(struct rt2x00_dev *rt2x00dev)
{
        int retval;

        /*
         * Allocate eeprom data.
         */
        retval = rt2400pci_validate_eeprom(rt2x00dev);
        if (retval)
                return retval;

        retval = rt2400pci_init_eeprom(rt2x00dev);
        if (retval)
                return retval;

        /*
         * Initialize hw specifications.
         */
        rt2400pci_probe_hw_mode(rt2x00dev);

        /*
         * This device requires the atim queue
         */
        __set_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags);

        /*
         * Set the rssi offset.
         */
        rt2x00dev->rssi_offset = DEFAULT_RSSI_OFFSET;

        return 0;
}

/*
 * IEEE80211 stack callback functions.
 */
static void rt2400pci_configure_filter(struct ieee80211_hw *hw,
                                       unsigned int changed_flags,
                                       unsigned int *total_flags,
                                       int mc_count,
                                       struct dev_addr_list *mc_list)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        u32 reg;

        /*
         * Mask off any flags we are going to ignore from
         * the total_flags field.
         */
        *total_flags &=
            FIF_ALLMULTI |
            FIF_FCSFAIL |
            FIF_PLCPFAIL |
            FIF_CONTROL |
            FIF_OTHER_BSS |
            FIF_PROMISC_IN_BSS;

        /*
         * Apply some rules to the filters:
         * - Some filters imply different filters to be set.
         * - Some things we can't filter out at all.
         */
        *total_flags |= FIF_ALLMULTI;
        if (*total_flags & FIF_OTHER_BSS ||
            *total_flags & FIF_PROMISC_IN_BSS)
                *total_flags |= FIF_PROMISC_IN_BSS | FIF_OTHER_BSS;

        /*
         * Check if there is any work left for us.
         */
        if (rt2x00dev->packet_filter == *total_flags)
                return;
        rt2x00dev->packet_filter = *total_flags;

        /*
         * Start configuration steps.
         * Note that the version error will always be dropped
         * since there is no filter for it at this time.
         */
        rt2x00pci_register_read(rt2x00dev, RXCSR0, &reg);
        rt2x00_set_field32(&reg, RXCSR0_DROP_CRC,
                           !(*total_flags & FIF_FCSFAIL));
        rt2x00_set_field32(&reg, RXCSR0_DROP_PHYSICAL,
                           !(*total_flags & FIF_PLCPFAIL));
        rt2x00_set_field32(&reg, RXCSR0_DROP_CONTROL,
                           !(*total_flags & FIF_CONTROL));
        rt2x00_set_field32(&reg, RXCSR0_DROP_NOT_TO_ME,
                           !(*total_flags & FIF_PROMISC_IN_BSS));
        rt2x00_set_field32(&reg, RXCSR0_DROP_TODS,
                           !(*total_flags & FIF_PROMISC_IN_BSS));
        rt2x00_set_field32(&reg, RXCSR0_DROP_VERSION_ERROR, 1);
        rt2x00pci_register_write(rt2x00dev, RXCSR0, reg);
}

static int rt2400pci_set_retry_limit(struct ieee80211_hw *hw,
                                     u32 short_retry, u32 long_retry)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, CSR11, &reg);
        rt2x00_set_field32(&reg, CSR11_LONG_RETRY, long_retry);
        rt2x00_set_field32(&reg, CSR11_SHORT_RETRY, short_retry);
        rt2x00pci_register_write(rt2x00dev, CSR11, reg);

        return 0;
}

static int rt2400pci_conf_tx(struct ieee80211_hw *hw,
                             int queue,
                             const struct ieee80211_tx_queue_params *params)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;

        /*
         * We don't support variating cw_min and cw_max variables
         * per queue. So by default we only configure the TX queue,
         * and ignore all other configurations.
         */
        if (queue != IEEE80211_TX_QUEUE_DATA0)
                return -EINVAL;

        if (rt2x00mac_conf_tx(hw, queue, params))
                return -EINVAL;

        /*
         * Write configuration to register.
         */
        rt2400pci_config_cw(rt2x00dev,
                            rt2x00dev->tx->cw_min, rt2x00dev->tx->cw_max);

        return 0;
}

static u64 rt2400pci_get_tsf(struct ieee80211_hw *hw)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        u64 tsf;
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, CSR17, &reg);
        tsf = (u64) rt2x00_get_field32(reg, CSR17_HIGH_TSFTIMER) << 32;
        rt2x00pci_register_read(rt2x00dev, CSR16, &reg);
        tsf |= rt2x00_get_field32(reg, CSR16_LOW_TSFTIMER);

        return tsf;
}

static int rt2400pci_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb,
                                   struct ieee80211_tx_control *control)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        struct rt2x00_intf *intf = vif_to_intf(control->vif);
        struct queue_entry_priv_pci_tx *priv_tx;
        struct skb_frame_desc *skbdesc;
        u32 reg;

        if (unlikely(!intf->beacon))
                return -ENOBUFS;
        priv_tx = intf->beacon->priv_data;

        /*
         * Fill in skb descriptor
         */
        skbdesc = get_skb_frame_desc(skb);
        memset(skbdesc, 0, sizeof(*skbdesc));
        skbdesc->flags |= FRAME_DESC_DRIVER_GENERATED;
        skbdesc->data = skb->data;
        skbdesc->data_len = skb->len;
        skbdesc->desc = priv_tx->desc;
        skbdesc->desc_len = intf->beacon->queue->desc_size;
        skbdesc->entry = intf->beacon;

        /*
         * Disable beaconing while we are reloading the beacon data,
         * otherwise we might be sending out invalid data.
         */
        rt2x00pci_register_read(rt2x00dev, CSR14, &reg);
        rt2x00_set_field32(&reg, CSR14_TSF_COUNT, 0);
        rt2x00_set_field32(&reg, CSR14_TBCN, 0);
        rt2x00_set_field32(&reg, CSR14_BEACON_GEN, 0);
        rt2x00pci_register_write(rt2x00dev, CSR14, reg);

        /*
         * mac80211 doesn't provide the control->queue variable
         * for beacons. Set our own queue identification so
         * it can be used during descriptor initialization.
         */
        control->queue = RT2X00_BCN_QUEUE_BEACON;
        rt2x00lib_write_tx_desc(rt2x00dev, skb, control);

        /*
         * Enable beacon generation.
         * Write entire beacon with descriptor to register,
         * and kick the beacon generator.
         */
        memcpy(priv_tx->data, skb->data, skb->len);
        rt2x00dev->ops->lib->kick_tx_queue(rt2x00dev, control->queue);

        return 0;
}

static int rt2400pci_tx_last_beacon(struct ieee80211_hw *hw)
{
        struct rt2x00_dev *rt2x00dev = hw->priv;
        u32 reg;

        rt2x00pci_register_read(rt2x00dev, CSR15, &reg);
        return rt2x00_get_field32(reg, CSR15_BEACON_SENT);
}

static const struct ieee80211_ops rt2400pci_mac80211_ops = {
        .tx                     = rt2x00mac_tx,
        .start                  = rt2x00mac_start,
        .stop                   = rt2x00mac_stop,
        .add_interface          = rt2x00mac_add_interface,
        .remove_interface       = rt2x00mac_remove_interface,
        .config                 = rt2x00mac_config,
        .config_interface       = rt2x00mac_config_interface,
        .configure_filter       = rt2400pci_configure_filter,
        .get_stats              = rt2x00mac_get_stats,
        .set_retry_limit        = rt2400pci_set_retry_limit,
        .bss_info_changed       = rt2x00mac_bss_info_changed,
        .conf_tx                = rt2400pci_conf_tx,
        .get_tx_stats           = rt2x00mac_get_tx_stats,
        .get_tsf                = rt2400pci_get_tsf,
        .beacon_update          = rt2400pci_beacon_update,
        .tx_last_beacon         = rt2400pci_tx_last_beacon,
};

static const struct rt2x00lib_ops rt2400pci_rt2x00_ops = {
        .irq_handler            = rt2400pci_interrupt,
        .probe_hw               = rt2400pci_probe_hw,
        .initialize             = rt2x00pci_initialize,
        .uninitialize           = rt2x00pci_uninitialize,
        .init_rxentry           = rt2400pci_init_rxentry,
        .init_txentry           = rt2400pci_init_txentry,
        .set_device_state       = rt2400pci_set_device_state,
        .rfkill_poll            = rt2400pci_rfkill_poll,
        .link_stats             = rt2400pci_link_stats,
        .reset_tuner            = rt2400pci_reset_tuner,
        .link_tuner             = rt2400pci_link_tuner,
        .led_brightness         = rt2400pci_led_brightness,
        .write_tx_desc          = rt2400pci_write_tx_desc,
        .write_tx_data          = rt2x00pci_write_tx_data,
        .kick_tx_queue          = rt2400pci_kick_tx_queue,
        .fill_rxdone            = rt2400pci_fill_rxdone,
        .config_intf            = rt2400pci_config_intf,
        .config_erp             = rt2400pci_config_erp,
        .config                 = rt2400pci_config,
};

static const struct data_queue_desc rt2400pci_queue_rx = {
        .entry_num              = RX_ENTRIES,
        .data_size              = DATA_FRAME_SIZE,
        .desc_size              = RXD_DESC_SIZE,
        .priv_size              = sizeof(struct queue_entry_priv_pci_rx),
};

static const struct data_queue_desc rt2400pci_queue_tx = {
        .entry_num              = TX_ENTRIES,
        .data_size              = DATA_FRAME_SIZE,
        .desc_size              = TXD_DESC_SIZE,
        .priv_size              = sizeof(struct queue_entry_priv_pci_tx),
};

static const struct data_queue_desc rt2400pci_queue_bcn = {
        .entry_num              = BEACON_ENTRIES,
        .data_size              = MGMT_FRAME_SIZE,
        .desc_size              = TXD_DESC_SIZE,
        .priv_size              = sizeof(struct queue_entry_priv_pci_tx),
};

static const struct data_queue_desc rt2400pci_queue_atim = {
        .entry_num              = ATIM_ENTRIES,
        .data_size              = DATA_FRAME_SIZE,
        .desc_size              = TXD_DESC_SIZE,
        .priv_size              = sizeof(struct queue_entry_priv_pci_tx),
};

static const struct rt2x00_ops rt2400pci_ops = {
        .name           = KBUILD_MODNAME,
        .max_sta_intf   = 1,
        .max_ap_intf    = 1,
        .eeprom_size    = EEPROM_SIZE,
        .rf_size        = RF_SIZE,
        .rx             = &rt2400pci_queue_rx,
        .tx             = &rt2400pci_queue_tx,
        .bcn            = &rt2400pci_queue_bcn,
        .atim           = &rt2400pci_queue_atim,
        .lib            = &rt2400pci_rt2x00_ops,
        .hw             = &rt2400pci_mac80211_ops,
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
        .debugfs        = &rt2400pci_rt2x00debug,
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
};

/*
 * RT2400pci module information.
 */
static struct pci_device_id rt2400pci_device_table[] = {
        { PCI_DEVICE(0x1814, 0x0101), PCI_DEVICE_DATA(&rt2400pci_ops) },
        { 0, }
};

MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("Ralink RT2400 PCI & PCMCIA Wireless LAN driver.");
MODULE_SUPPORTED_DEVICE("Ralink RT2460 PCI & PCMCIA chipset based cards");
MODULE_DEVICE_TABLE(pci, rt2400pci_device_table);
MODULE_LICENSE("GPL");

static struct pci_driver rt2400pci_driver = {
        .name           = KBUILD_MODNAME,
        .id_table       = rt2400pci_device_table,
        .probe          = rt2x00pci_probe,
        .remove         = __devexit_p(rt2x00pci_remove),
        .suspend        = rt2x00pci_suspend,
        .resume         = rt2x00pci_resume,
};

static int __init rt2400pci_init(void)
{
        return pci_register_driver(&rt2400pci_driver);
}

static void __exit rt2400pci_exit(void)
{
        pci_unregister_driver(&rt2400pci_driver);
}

module_init(rt2400pci_init);
module_exit(rt2400pci_exit);