Merge master.kernel.org:/pub/scm/linux/kernel/git/davej/cpufreq

[linux-2.6] / drivers / net / irda / smsc-ircc2.c

/*********************************************************************
 * $Id: smsc-ircc2.c,v 1.19.2.5 2002/10/27 11:34:26 dip Exp $
 *
 * Description:   Driver for the SMC Infrared Communications Controller
 * Status:        Experimental.
 * Author:        Daniele Peri (peri@csai.unipa.it)
 * Created at:
 * Modified at:
 * Modified by:
 *
 *     Copyright (c) 2002      Daniele Peri
 *     All Rights Reserved.
 *     Copyright (c) 2002      Jean Tourrilhes
 *
 *
 * Based on smc-ircc.c:
 *
 *     Copyright (c) 2001      Stefani Seibold
 *     Copyright (c) 1999-2001 Dag Brattli
 *     Copyright (c) 1998-1999 Thomas Davis,
 *
 *      and irport.c:
 *
 *     Copyright (c) 1997, 1998, 1999-2000 Dag Brattli, All Rights Reserved.
 *
 *
 *     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
 *
 ********************************************************************/

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/rtnetlink.h>
#include <linux/serial_reg.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>

#include <linux/spinlock.h>
#include <linux/pm.h>

#include <net/irda/wrapper.h>
#include <net/irda/irda.h>
#include <net/irda/irda_device.h>

#include "smsc-ircc2.h"
#include "smsc-sio.h"


MODULE_AUTHOR("Daniele Peri <peri@csai.unipa.it>");
MODULE_DESCRIPTION("SMC IrCC SIR/FIR controller driver");
MODULE_LICENSE("GPL");

static int ircc_dma = 255;
module_param(ircc_dma, int, 0);
MODULE_PARM_DESC(ircc_dma, "DMA channel");

static int ircc_irq = 255;
module_param(ircc_irq, int, 0);
MODULE_PARM_DESC(ircc_irq, "IRQ line");

static int ircc_fir;
module_param(ircc_fir, int, 0);
MODULE_PARM_DESC(ircc_fir, "FIR Base Address");

static int ircc_sir;
module_param(ircc_sir, int, 0);
MODULE_PARM_DESC(ircc_sir, "SIR Base Address");

static int ircc_cfg;
module_param(ircc_cfg, int, 0);
MODULE_PARM_DESC(ircc_cfg, "Configuration register base address");

static int ircc_transceiver;
module_param(ircc_transceiver, int, 0);
MODULE_PARM_DESC(ircc_transceiver, "Transceiver type");

/* Types */

struct smsc_transceiver {
        char *name;
        void (*set_for_speed)(int fir_base, u32 speed);
        int  (*probe)(int fir_base);
};

struct smsc_chip {
        char *name;
        #if 0
        u8      type;
        #endif
        u16 flags;
        u8 devid;
        u8 rev;
};

struct smsc_chip_address {
        unsigned int cfg_base;
        unsigned int type;
};

/* Private data for each instance */
struct smsc_ircc_cb {
        struct net_device *netdev;     /* Yes! we are some kind of netdevice */
        struct net_device_stats stats;
        struct irlap_cb    *irlap; /* The link layer we are binded to */

        chipio_t io;               /* IrDA controller information */
        iobuff_t tx_buff;          /* Transmit buffer */
        iobuff_t rx_buff;          /* Receive buffer */
        dma_addr_t tx_buff_dma;
        dma_addr_t rx_buff_dma;

        struct qos_info qos;       /* QoS capabilities for this device */

        spinlock_t lock;           /* For serializing operations */

        __u32 new_speed;
        __u32 flags;               /* Interface flags */

        int tx_buff_offsets[10];   /* Offsets between frames in tx_buff */
        int tx_len;                /* Number of frames in tx_buff */

        int transceiver;
        struct platform_device *pldev;
};

/* Constants */

#define SMSC_IRCC2_DRIVER_NAME                  "smsc-ircc2"

#define SMSC_IRCC2_C_IRDA_FALLBACK_SPEED        9600
#define SMSC_IRCC2_C_DEFAULT_TRANSCEIVER        1
#define SMSC_IRCC2_C_NET_TIMEOUT                0
#define SMSC_IRCC2_C_SIR_STOP                   0

static const char *driver_name = SMSC_IRCC2_DRIVER_NAME;

/* Prototypes */

static int smsc_ircc_open(unsigned int firbase, unsigned int sirbase, u8 dma, u8 irq);
static int smsc_ircc_present(unsigned int fir_base, unsigned int sir_base);
static void smsc_ircc_setup_io(struct smsc_ircc_cb *self, unsigned int fir_base, unsigned int sir_base, u8 dma, u8 irq);
static void smsc_ircc_setup_qos(struct smsc_ircc_cb *self);
static void smsc_ircc_init_chip(struct smsc_ircc_cb *self);
static int __exit smsc_ircc_close(struct smsc_ircc_cb *self);
static int  smsc_ircc_dma_receive(struct smsc_ircc_cb *self);
static void smsc_ircc_dma_receive_complete(struct smsc_ircc_cb *self);
static void smsc_ircc_sir_receive(struct smsc_ircc_cb *self);
static int  smsc_ircc_hard_xmit_sir(struct sk_buff *skb, struct net_device *dev);
static int  smsc_ircc_hard_xmit_fir(struct sk_buff *skb, struct net_device *dev);
static void smsc_ircc_dma_xmit(struct smsc_ircc_cb *self, int bofs);
static void smsc_ircc_dma_xmit_complete(struct smsc_ircc_cb *self);
static void smsc_ircc_change_speed(struct smsc_ircc_cb *self, u32 speed);
static void smsc_ircc_set_sir_speed(struct smsc_ircc_cb *self, u32 speed);
static irqreturn_t smsc_ircc_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static irqreturn_t smsc_ircc_interrupt_sir(struct net_device *dev);
static void smsc_ircc_sir_start(struct smsc_ircc_cb *self);
#if SMSC_IRCC2_C_SIR_STOP
static void smsc_ircc_sir_stop(struct smsc_ircc_cb *self);
#endif
static void smsc_ircc_sir_write_wakeup(struct smsc_ircc_cb *self);
static int  smsc_ircc_sir_write(int iobase, int fifo_size, __u8 *buf, int len);
static int  smsc_ircc_net_open(struct net_device *dev);
static int  smsc_ircc_net_close(struct net_device *dev);
static int  smsc_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
#if SMSC_IRCC2_C_NET_TIMEOUT
static void smsc_ircc_timeout(struct net_device *dev);
#endif
static struct net_device_stats *smsc_ircc_net_get_stats(struct net_device *dev);
static int smsc_ircc_is_receiving(struct smsc_ircc_cb *self);
static void smsc_ircc_probe_transceiver(struct smsc_ircc_cb *self);
static void smsc_ircc_set_transceiver_for_speed(struct smsc_ircc_cb *self, u32 speed);
static void smsc_ircc_sir_wait_hw_transmitter_finish(struct smsc_ircc_cb *self);

/* Probing */
static int __init smsc_ircc_look_for_chips(void);
static const struct smsc_chip * __init smsc_ircc_probe(unsigned short cfg_base, u8 reg, const struct smsc_chip *chip, char *type);
static int __init smsc_superio_flat(const struct smsc_chip *chips, unsigned short cfg_base, char *type);
static int __init smsc_superio_paged(const struct smsc_chip *chips, unsigned short cfg_base, char *type);
static int __init smsc_superio_fdc(unsigned short cfg_base);
static int __init smsc_superio_lpc(unsigned short cfg_base);

/* Transceivers specific functions */

static void smsc_ircc_set_transceiver_toshiba_sat1800(int fir_base, u32 speed);
static int  smsc_ircc_probe_transceiver_toshiba_sat1800(int fir_base);
static void smsc_ircc_set_transceiver_smsc_ircc_fast_pin_select(int fir_base, u32 speed);
static int  smsc_ircc_probe_transceiver_smsc_ircc_fast_pin_select(int fir_base);
static void smsc_ircc_set_transceiver_smsc_ircc_atc(int fir_base, u32 speed);
static int  smsc_ircc_probe_transceiver_smsc_ircc_atc(int fir_base);

/* Power Management */

static int smsc_ircc_suspend(struct device *dev, pm_message_t state, u32 level);
static int smsc_ircc_resume(struct device *dev, u32 level);

static struct device_driver smsc_ircc_driver = {
        .name           = SMSC_IRCC2_DRIVER_NAME,
        .bus            = &platform_bus_type,
        .suspend        = smsc_ircc_suspend,
        .resume         = smsc_ircc_resume,
};

/* Transceivers for SMSC-ircc */

static struct smsc_transceiver smsc_transceivers[] =
{
        { "Toshiba Satellite 1800 (GP data pin select)", smsc_ircc_set_transceiver_toshiba_sat1800, smsc_ircc_probe_transceiver_toshiba_sat1800 },
        { "Fast pin select", smsc_ircc_set_transceiver_smsc_ircc_fast_pin_select, smsc_ircc_probe_transceiver_smsc_ircc_fast_pin_select },
        { "ATC IRMode", smsc_ircc_set_transceiver_smsc_ircc_atc, smsc_ircc_probe_transceiver_smsc_ircc_atc },
        { NULL, NULL }
};
#define SMSC_IRCC2_C_NUMBER_OF_TRANSCEIVERS (ARRAY_SIZE(smsc_transceivers) - 1)

/*  SMC SuperIO chipsets definitions */

#define KEY55_1 0       /* SuperIO Configuration mode with Key <0x55> */
#define KEY55_2 1       /* SuperIO Configuration mode with Key <0x55,0x55> */
#define NoIRDA  2       /* SuperIO Chip has no IRDA Port */
#define SIR     0       /* SuperIO Chip has only slow IRDA */
#define FIR     4       /* SuperIO Chip has fast IRDA */
#define SERx4   8       /* SuperIO Chip supports 115,2 KBaud * 4=460,8 KBaud */

static struct smsc_chip __initdata fdc_chips_flat[] =
{
        /* Base address 0x3f0 or 0x370 */
        { "37C44",      KEY55_1|NoIRDA,         0x00, 0x00 }, /* This chip cannot be detected */
        { "37C665GT",   KEY55_2|NoIRDA,         0x65, 0x01 },
        { "37C665GT",   KEY55_2|NoIRDA,         0x66, 0x01 },
        { "37C669",     KEY55_2|SIR|SERx4,      0x03, 0x02 },
        { "37C669",     KEY55_2|SIR|SERx4,      0x04, 0x02 }, /* ID? */
        { "37C78",      KEY55_2|NoIRDA,         0x78, 0x00 },
        { "37N769",     KEY55_1|FIR|SERx4,      0x28, 0x00 },
        { "37N869",     KEY55_1|FIR|SERx4,      0x29, 0x00 },
        { NULL }
};

static struct smsc_chip __initdata fdc_chips_paged[] =
{
        /* Base address 0x3f0 or 0x370 */
        { "37B72X",     KEY55_1|SIR|SERx4,      0x4c, 0x00 },
        { "37B77X",     KEY55_1|SIR|SERx4,      0x43, 0x00 },
        { "37B78X",     KEY55_1|SIR|SERx4,      0x44, 0x00 },
        { "37B80X",     KEY55_1|SIR|SERx4,      0x42, 0x00 },
        { "37C67X",     KEY55_1|FIR|SERx4,      0x40, 0x00 },
        { "37C93X",     KEY55_2|SIR|SERx4,      0x02, 0x01 },
        { "37C93XAPM",  KEY55_1|SIR|SERx4,      0x30, 0x01 },
        { "37C93XFR",   KEY55_2|FIR|SERx4,      0x03, 0x01 },
        { "37M707",     KEY55_1|SIR|SERx4,      0x42, 0x00 },
        { "37M81X",     KEY55_1|SIR|SERx4,      0x4d, 0x00 },
        { "37N958FR",   KEY55_1|FIR|SERx4,      0x09, 0x04 },
        { "37N971",     KEY55_1|FIR|SERx4,      0x0a, 0x00 },
        { "37N972",     KEY55_1|FIR|SERx4,      0x0b, 0x00 },
        { NULL }
};

static struct smsc_chip __initdata lpc_chips_flat[] =
{
        /* Base address 0x2E or 0x4E */
        { "47N227",     KEY55_1|FIR|SERx4,      0x5a, 0x00 },
        { "47N267",     KEY55_1|FIR|SERx4,      0x5e, 0x00 },
        { NULL }
};

static struct smsc_chip __initdata lpc_chips_paged[] =
{
        /* Base address 0x2E or 0x4E */
        { "47B27X",     KEY55_1|SIR|SERx4,      0x51, 0x00 },
        { "47B37X",     KEY55_1|SIR|SERx4,      0x52, 0x00 },
        { "47M10X",     KEY55_1|SIR|SERx4,      0x59, 0x00 },
        { "47M120",     KEY55_1|NoIRDA|SERx4,   0x5c, 0x00 },
        { "47M13X",     KEY55_1|SIR|SERx4,      0x59, 0x00 },
        { "47M14X",     KEY55_1|SIR|SERx4,      0x5f, 0x00 },
        { "47N252",     KEY55_1|FIR|SERx4,      0x0e, 0x00 },
        { "47S42X",     KEY55_1|SIR|SERx4,      0x57, 0x00 },
        { NULL }
};

#define SMSCSIO_TYPE_FDC        1
#define SMSCSIO_TYPE_LPC        2
#define SMSCSIO_TYPE_FLAT       4
#define SMSCSIO_TYPE_PAGED      8

static struct smsc_chip_address __initdata possible_addresses[] =
{
        { 0x3f0, SMSCSIO_TYPE_FDC|SMSCSIO_TYPE_FLAT|SMSCSIO_TYPE_PAGED },
        { 0x370, SMSCSIO_TYPE_FDC|SMSCSIO_TYPE_FLAT|SMSCSIO_TYPE_PAGED },
        { 0xe0,  SMSCSIO_TYPE_FDC|SMSCSIO_TYPE_FLAT|SMSCSIO_TYPE_PAGED },
        { 0x2e,  SMSCSIO_TYPE_LPC|SMSCSIO_TYPE_FLAT|SMSCSIO_TYPE_PAGED },
        { 0x4e,  SMSCSIO_TYPE_LPC|SMSCSIO_TYPE_FLAT|SMSCSIO_TYPE_PAGED },
        { 0, 0 }
};

/* Globals */

static struct smsc_ircc_cb *dev_self[] = { NULL, NULL };
static unsigned short dev_count;

static inline void register_bank(int iobase, int bank)
{
        outb(((inb(iobase + IRCC_MASTER) & 0xf0) | (bank & 0x07)),
               iobase + IRCC_MASTER);
}


/*******************************************************************************
 *
 *
 * SMSC-ircc stuff
 *
 *
 *******************************************************************************/

/*
 * Function smsc_ircc_init ()
 *
 *    Initialize chip. Just try to find out how many chips we are dealing with
 *    and where they are
 */
static int __init smsc_ircc_init(void)
{
        int ret;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        ret = driver_register(&smsc_ircc_driver);
        if (ret) {
                IRDA_ERROR("%s, Can't register driver!\n", driver_name);
                return ret;
        }

        dev_count = 0;

        if (ircc_fir > 0 && ircc_sir > 0) {
                IRDA_MESSAGE(" Overriding FIR address 0x%04x\n", ircc_fir);
                IRDA_MESSAGE(" Overriding SIR address 0x%04x\n", ircc_sir);

                if (smsc_ircc_open(ircc_fir, ircc_sir, ircc_dma, ircc_irq))
                        ret = -ENODEV;
        } else {
                ret = -ENODEV;

                /* try user provided configuration register base address */
                if (ircc_cfg > 0) {
                        IRDA_MESSAGE(" Overriding configuration address "
                                     "0x%04x\n", ircc_cfg);
                        if (!smsc_superio_fdc(ircc_cfg))
                                ret = 0;
                        if (!smsc_superio_lpc(ircc_cfg))
                                ret = 0;
                }

                if (smsc_ircc_look_for_chips() > 0)
                        ret = 0;
        }

        if (ret)
                driver_unregister(&smsc_ircc_driver);

        return ret;
}

/*
 * Function smsc_ircc_open (firbase, sirbase, dma, irq)
 *
 *    Try to open driver instance
 *
 */
static int __init smsc_ircc_open(unsigned int fir_base, unsigned int sir_base, u8 dma, u8 irq)
{
        struct smsc_ircc_cb *self;
        struct net_device *dev;
        int err;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        err = smsc_ircc_present(fir_base, sir_base);
        if (err)
                goto err_out;

        err = -ENOMEM;
        if (dev_count >= ARRAY_SIZE(dev_self)) {
                IRDA_WARNING("%s(), too many devices!\n", __FUNCTION__);
                goto err_out1;
        }

        /*
         *  Allocate new instance of the driver
         */
        dev = alloc_irdadev(sizeof(struct smsc_ircc_cb));
        if (!dev) {
                IRDA_WARNING("%s() can't allocate net device\n", __FUNCTION__);
                goto err_out1;
        }

        SET_MODULE_OWNER(dev);

        dev->hard_start_xmit = smsc_ircc_hard_xmit_sir;
#if SMSC_IRCC2_C_NET_TIMEOUT
        dev->tx_timeout      = smsc_ircc_timeout;
        dev->watchdog_timeo  = HZ * 2;  /* Allow enough time for speed change */
#endif
        dev->open            = smsc_ircc_net_open;
        dev->stop            = smsc_ircc_net_close;
        dev->do_ioctl        = smsc_ircc_net_ioctl;
        dev->get_stats       = smsc_ircc_net_get_stats;

        self = netdev_priv(dev);
        self->netdev = dev;

        /* Make ifconfig display some details */
        dev->base_addr = self->io.fir_base = fir_base;
        dev->irq = self->io.irq = irq;

        /* Need to store self somewhere */
        dev_self[dev_count] = self;
        spin_lock_init(&self->lock);

        self->rx_buff.truesize = SMSC_IRCC2_RX_BUFF_TRUESIZE;
        self->tx_buff.truesize = SMSC_IRCC2_TX_BUFF_TRUESIZE;

        self->rx_buff.head =
                dma_alloc_coherent(NULL, self->rx_buff.truesize,
                                   &self->rx_buff_dma, GFP_KERNEL);
        if (self->rx_buff.head == NULL) {
                IRDA_ERROR("%s, Can't allocate memory for receive buffer!\n",
                           driver_name);
                goto err_out2;
        }

        self->tx_buff.head =
                dma_alloc_coherent(NULL, self->tx_buff.truesize,
                                   &self->tx_buff_dma, GFP_KERNEL);
        if (self->tx_buff.head == NULL) {
                IRDA_ERROR("%s, Can't allocate memory for transmit buffer!\n",
                           driver_name);
                goto err_out3;
        }

        memset(self->rx_buff.head, 0, self->rx_buff.truesize);
        memset(self->tx_buff.head, 0, self->tx_buff.truesize);

        self->rx_buff.in_frame = FALSE;
        self->rx_buff.state = OUTSIDE_FRAME;
        self->tx_buff.data = self->tx_buff.head;
        self->rx_buff.data = self->rx_buff.head;

        smsc_ircc_setup_io(self, fir_base, sir_base, dma, irq);
        smsc_ircc_setup_qos(self);
        smsc_ircc_init_chip(self);

        if (ircc_transceiver > 0  &&
            ircc_transceiver < SMSC_IRCC2_C_NUMBER_OF_TRANSCEIVERS)
                self->transceiver = ircc_transceiver;
        else
                smsc_ircc_probe_transceiver(self);

        err = register_netdev(self->netdev);
        if (err) {
                IRDA_ERROR("%s, Network device registration failed!\n",
                           driver_name);
                goto err_out4;
        }

        self->pldev = platform_device_register_simple(SMSC_IRCC2_DRIVER_NAME,
                                                      dev_count, NULL, 0);
        if (IS_ERR(self->pldev)) {
                err = PTR_ERR(self->pldev);
                goto err_out5;
        }
        dev_set_drvdata(&self->pldev->dev, self);

        IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
        dev_count++;

        return 0;

 err_out5:
        unregister_netdev(self->netdev);

 err_out4:
        dma_free_coherent(NULL, self->tx_buff.truesize,
                          self->tx_buff.head, self->tx_buff_dma);
 err_out3:
        dma_free_coherent(NULL, self->rx_buff.truesize,
                          self->rx_buff.head, self->rx_buff_dma);
 err_out2:
        free_netdev(self->netdev);
        dev_self[dev_count] = NULL;
 err_out1:
        release_region(fir_base, SMSC_IRCC2_FIR_CHIP_IO_EXTENT);
        release_region(sir_base, SMSC_IRCC2_SIR_CHIP_IO_EXTENT);
 err_out:
        return err;
}

/*
 * Function smsc_ircc_present(fir_base, sir_base)
 *
 *    Check the smsc-ircc chip presence
 *
 */
static int smsc_ircc_present(unsigned int fir_base, unsigned int sir_base)
{
        unsigned char low, high, chip, config, dma, irq, version;

        if (!request_region(fir_base, SMSC_IRCC2_FIR_CHIP_IO_EXTENT,
                            driver_name)) {
                IRDA_WARNING("%s: can't get fir_base of 0x%03x\n",
                             __FUNCTION__, fir_base);
                goto out1;
        }

        if (!request_region(sir_base, SMSC_IRCC2_SIR_CHIP_IO_EXTENT,
                            driver_name)) {
                IRDA_WARNING("%s: can't get sir_base of 0x%03x\n",
                             __FUNCTION__, sir_base);
                goto out2;
        }

        register_bank(fir_base, 3);

        high    = inb(fir_base + IRCC_ID_HIGH);
        low     = inb(fir_base + IRCC_ID_LOW);
        chip    = inb(fir_base + IRCC_CHIP_ID);
        version = inb(fir_base + IRCC_VERSION);
        config  = inb(fir_base + IRCC_INTERFACE);
        dma     = config & IRCC_INTERFACE_DMA_MASK;
        irq     = (config & IRCC_INTERFACE_IRQ_MASK) >> 4;

        if (high != 0x10 || low != 0xb8 || (chip != 0xf1 && chip != 0xf2)) {
                IRDA_WARNING("%s(), addr 0x%04x - no device found!\n",
                             __FUNCTION__, fir_base);
                goto out3;
        }
        IRDA_MESSAGE("SMsC IrDA Controller found\n IrCC version %d.%d, "
                     "firport 0x%03x, sirport 0x%03x dma=%d, irq=%d\n",
                     chip & 0x0f, version, fir_base, sir_base, dma, irq);

        return 0;

 out3:
        release_region(sir_base, SMSC_IRCC2_SIR_CHIP_IO_EXTENT);
 out2:
        release_region(fir_base, SMSC_IRCC2_FIR_CHIP_IO_EXTENT);
 out1:
        return -ENODEV;
}

/*
 * Function smsc_ircc_setup_io(self, fir_base, sir_base, dma, irq)
 *
 *    Setup I/O
 *
 */
static void smsc_ircc_setup_io(struct smsc_ircc_cb *self,
                               unsigned int fir_base, unsigned int sir_base,
                               u8 dma, u8 irq)
{
        unsigned char config, chip_dma, chip_irq;

        register_bank(fir_base, 3);
        config = inb(fir_base + IRCC_INTERFACE);
        chip_dma = config & IRCC_INTERFACE_DMA_MASK;
        chip_irq = (config & IRCC_INTERFACE_IRQ_MASK) >> 4;

        self->io.fir_base  = fir_base;
        self->io.sir_base  = sir_base;
        self->io.fir_ext   = SMSC_IRCC2_FIR_CHIP_IO_EXTENT;
        self->io.sir_ext   = SMSC_IRCC2_SIR_CHIP_IO_EXTENT;
        self->io.fifo_size = SMSC_IRCC2_FIFO_SIZE;
        self->io.speed = SMSC_IRCC2_C_IRDA_FALLBACK_SPEED;

        if (irq < 255) {
                if (irq != chip_irq)
                        IRDA_MESSAGE("%s, Overriding IRQ - chip says %d, using %d\n",
                                     driver_name, chip_irq, irq);
                self->io.irq = irq;
        } else
                self->io.irq = chip_irq;

        if (dma < 255) {
                if (dma != chip_dma)
                        IRDA_MESSAGE("%s, Overriding DMA - chip says %d, using %d\n",
                                     driver_name, chip_dma, dma);
                self->io.dma = dma;
        } else
                self->io.dma = chip_dma;

}

/*
 * Function smsc_ircc_setup_qos(self)
 *
 *    Setup qos
 *
 */
static void smsc_ircc_setup_qos(struct smsc_ircc_cb *self)
{
        /* Initialize QoS for this device */
        irda_init_max_qos_capabilies(&self->qos);

        self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
                IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);

        self->qos.min_turn_time.bits = SMSC_IRCC2_MIN_TURN_TIME;
        self->qos.window_size.bits = SMSC_IRCC2_WINDOW_SIZE;
        irda_qos_bits_to_value(&self->qos);
}

/*
 * Function smsc_ircc_init_chip(self)
 *
 *    Init chip
 *
 */
static void smsc_ircc_init_chip(struct smsc_ircc_cb *self)
{
        int iobase, ir_mode, ctrl, fast;

        IRDA_ASSERT(self != NULL, return;);

        iobase = self->io.fir_base;
        ir_mode = IRCC_CFGA_IRDA_SIR_A;
        ctrl = 0;
        fast = 0;

        register_bank(iobase, 0);
        outb(IRCC_MASTER_RESET, iobase + IRCC_MASTER);
        outb(0x00, iobase + IRCC_MASTER);

        register_bank(iobase, 1);
        outb(((inb(iobase + IRCC_SCE_CFGA) & 0x87) | ir_mode),
             iobase + IRCC_SCE_CFGA);

#ifdef smsc_669 /* Uses pin 88/89 for Rx/Tx */
        outb(((inb(iobase + IRCC_SCE_CFGB) & 0x3f) | IRCC_CFGB_MUX_COM),
             iobase + IRCC_SCE_CFGB);
#else
        outb(((inb(iobase + IRCC_SCE_CFGB) & 0x3f) | IRCC_CFGB_MUX_IR),
             iobase + IRCC_SCE_CFGB);
#endif
        (void) inb(iobase + IRCC_FIFO_THRESHOLD);
        outb(SMSC_IRCC2_FIFO_THRESHOLD, iobase + IRCC_FIFO_THRESHOLD);

        register_bank(iobase, 4);
        outb((inb(iobase + IRCC_CONTROL) & 0x30) | ctrl, iobase + IRCC_CONTROL);

        register_bank(iobase, 0);
        outb(fast, iobase + IRCC_LCR_A);

        smsc_ircc_set_sir_speed(self, SMSC_IRCC2_C_IRDA_FALLBACK_SPEED);

        /* Power on device */
        outb(0x00, iobase + IRCC_MASTER);
}

/*
 * Function smsc_ircc_net_ioctl (dev, rq, cmd)
 *
 *    Process IOCTL commands for this device
 *
 */
static int smsc_ircc_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
        struct if_irda_req *irq = (struct if_irda_req *) rq;
        struct smsc_ircc_cb *self;
        unsigned long flags;
        int ret = 0;

        IRDA_ASSERT(dev != NULL, return -1;);

        self = netdev_priv(dev);

        IRDA_ASSERT(self != NULL, return -1;);

        IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__, dev->name, cmd);

        switch (cmd) {
        case SIOCSBANDWIDTH: /* Set bandwidth */
                if (!capable(CAP_NET_ADMIN))
                        ret = -EPERM;
                else {
                        /* Make sure we are the only one touching
                         * self->io.speed and the hardware - Jean II */
                        spin_lock_irqsave(&self->lock, flags);
                        smsc_ircc_change_speed(self, irq->ifr_baudrate);
                        spin_unlock_irqrestore(&self->lock, flags);
                }
                break;
        case SIOCSMEDIABUSY: /* Set media busy */
                if (!capable(CAP_NET_ADMIN)) {
                        ret = -EPERM;
                        break;
                }

                irda_device_set_media_busy(self->netdev, TRUE);
                break;
        case SIOCGRECEIVING: /* Check if we are receiving right now */
                irq->ifr_receiving = smsc_ircc_is_receiving(self);
                break;
        #if 0
        case SIOCSDTRRTS:
                if (!capable(CAP_NET_ADMIN)) {
                        ret = -EPERM;
                        break;
                }
                smsc_ircc_sir_set_dtr_rts(dev, irq->ifr_dtr, irq->ifr_rts);
                break;
        #endif
        default:
                ret = -EOPNOTSUPP;
        }

        return ret;
}

static struct net_device_stats *smsc_ircc_net_get_stats(struct net_device *dev)
{
        struct smsc_ircc_cb *self = netdev_priv(dev);

        return &self->stats;
}

#if SMSC_IRCC2_C_NET_TIMEOUT
/*
 * Function smsc_ircc_timeout (struct net_device *dev)
 *
 *    The networking timeout management.
 *
 */

static void smsc_ircc_timeout(struct net_device *dev)
{
        struct smsc_ircc_cb *self = netdev_priv(dev);
        unsigned long flags;

        IRDA_WARNING("%s: transmit timed out, changing speed to: %d\n",
                     dev->name, self->io.speed);
        spin_lock_irqsave(&self->lock, flags);
        smsc_ircc_sir_start(self);
        smsc_ircc_change_speed(self, self->io.speed);
        dev->trans_start = jiffies;
        netif_wake_queue(dev);
        spin_unlock_irqrestore(&self->lock, flags);
}
#endif

/*
 * Function smsc_ircc_hard_xmit_sir (struct sk_buff *skb, struct net_device *dev)
 *
 *    Transmits the current frame until FIFO is full, then
 *    waits until the next transmit interrupt, and continues until the
 *    frame is transmitted.
 */
int smsc_ircc_hard_xmit_sir(struct sk_buff *skb, struct net_device *dev)
{
        struct smsc_ircc_cb *self;
        unsigned long flags;
        s32 speed;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(dev != NULL, return 0;);

        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return 0;);

        netif_stop_queue(dev);

        /* Make sure test of self->io.speed & speed change are atomic */
        spin_lock_irqsave(&self->lock, flags);

        /* Check if we need to change the speed */
        speed = irda_get_next_speed(skb);
        if (speed != self->io.speed && speed != -1) {
                /* Check for empty frame */
                if (!skb->len) {
                        /*
                         * We send frames one by one in SIR mode (no
                         * pipelining), so at this point, if we were sending
                         * a previous frame, we just received the interrupt
                         * telling us it is finished (UART_IIR_THRI).
                         * Therefore, waiting for the transmitter to really
                         * finish draining the fifo won't take too long.
                         * And the interrupt handler is not expected to run.
                         * - Jean II */
                        smsc_ircc_sir_wait_hw_transmitter_finish(self);
                        smsc_ircc_change_speed(self, speed);
                        spin_unlock_irqrestore(&self->lock, flags);
                        dev_kfree_skb(skb);
                        return 0;
                }
                self->new_speed = speed;
        }

        /* Init tx buffer */
        self->tx_buff.data = self->tx_buff.head;

        /* Copy skb to tx_buff while wrapping, stuffing and making CRC */
        self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
                                           self->tx_buff.truesize);

        self->stats.tx_bytes += self->tx_buff.len;

        /* Turn on transmit finished interrupt. Will fire immediately!  */
        outb(UART_IER_THRI, self->io.sir_base + UART_IER);

        spin_unlock_irqrestore(&self->lock, flags);

        dev_kfree_skb(skb);

        return 0;
}

/*
 * Function smsc_ircc_set_fir_speed (self, baud)
 *
 *    Change the speed of the device
 *
 */
static void smsc_ircc_set_fir_speed(struct smsc_ircc_cb *self, u32 speed)
{
        int fir_base, ir_mode, ctrl, fast;

        IRDA_ASSERT(self != NULL, return;);
        fir_base = self->io.fir_base;

        self->io.speed = speed;

        switch (speed) {
        default:
        case 576000:
                ir_mode = IRCC_CFGA_IRDA_HDLC;
                ctrl = IRCC_CRC;
                fast = 0;
                IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __FUNCTION__);
                break;
        case 1152000:
                ir_mode = IRCC_CFGA_IRDA_HDLC;
                ctrl = IRCC_1152 | IRCC_CRC;
                fast = IRCC_LCR_A_FAST | IRCC_LCR_A_GP_DATA;
                IRDA_DEBUG(0, "%s(), handling baud of 1152000\n",
                           __FUNCTION__);
                break;
        case 4000000:
                ir_mode = IRCC_CFGA_IRDA_4PPM;
                ctrl = IRCC_CRC;
                fast = IRCC_LCR_A_FAST;
                IRDA_DEBUG(0, "%s(), handling baud of 4000000\n",
                           __FUNCTION__);
                break;
        }
        #if 0
        Now in tranceiver!
        /* This causes an interrupt */
        register_bank(fir_base, 0);
        outb((inb(fir_base + IRCC_LCR_A) &  0xbf) | fast, fir_base + IRCC_LCR_A);
        #endif

        register_bank(fir_base, 1);
        outb(((inb(fir_base + IRCC_SCE_CFGA) & IRCC_SCE_CFGA_BLOCK_CTRL_BITS_MASK) | ir_mode), fir_base + IRCC_SCE_CFGA);

        register_bank(fir_base, 4);
        outb((inb(fir_base + IRCC_CONTROL) & 0x30) | ctrl, fir_base + IRCC_CONTROL);
}

/*
 * Function smsc_ircc_fir_start(self)
 *
 *    Change the speed of the device
 *
 */
static void smsc_ircc_fir_start(struct smsc_ircc_cb *self)
{
        struct net_device *dev;
        int fir_base;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return;);
        dev = self->netdev;
        IRDA_ASSERT(dev != NULL, return;);

        fir_base = self->io.fir_base;

        /* Reset everything */

        /* Install FIR transmit handler */
        dev->hard_start_xmit = smsc_ircc_hard_xmit_fir;

        /* Clear FIFO */
        outb(inb(fir_base + IRCC_LCR_A) | IRCC_LCR_A_FIFO_RESET, fir_base + IRCC_LCR_A);

        /* Enable interrupt */
        /*outb(IRCC_IER_ACTIVE_FRAME|IRCC_IER_EOM, fir_base + IRCC_IER);*/

        register_bank(fir_base, 1);

        /* Select the TX/RX interface */
#ifdef SMSC_669 /* Uses pin 88/89 for Rx/Tx */
        outb(((inb(fir_base + IRCC_SCE_CFGB) & 0x3f) | IRCC_CFGB_MUX_COM),
             fir_base + IRCC_SCE_CFGB);
#else
        outb(((inb(fir_base + IRCC_SCE_CFGB) & 0x3f) | IRCC_CFGB_MUX_IR),
             fir_base + IRCC_SCE_CFGB);
#endif
        (void) inb(fir_base + IRCC_FIFO_THRESHOLD);

        /* Enable SCE interrupts */
        outb(0, fir_base + IRCC_MASTER);
        register_bank(fir_base, 0);
        outb(IRCC_IER_ACTIVE_FRAME | IRCC_IER_EOM, fir_base + IRCC_IER);
        outb(IRCC_MASTER_INT_EN, fir_base + IRCC_MASTER);
}

/*
 * Function smsc_ircc_fir_stop(self, baud)
 *
 *    Change the speed of the device
 *
 */
static void smsc_ircc_fir_stop(struct smsc_ircc_cb *self)
{
        int fir_base;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return;);

        fir_base = self->io.fir_base;
        register_bank(fir_base, 0);
        /*outb(IRCC_MASTER_RESET, fir_base + IRCC_MASTER);*/
        outb(inb(fir_base + IRCC_LCR_B) & IRCC_LCR_B_SIP_ENABLE, fir_base + IRCC_LCR_B);
}


/*
 * Function smsc_ircc_change_speed(self, baud)
 *
 *    Change the speed of the device
 *
 * This function *must* be called with spinlock held, because it may
 * be called from the irq handler. - Jean II
 */
static void smsc_ircc_change_speed(struct smsc_ircc_cb *self, u32 speed)
{
        struct net_device *dev;
        int last_speed_was_sir;

        IRDA_DEBUG(0, "%s() changing speed to: %d\n", __FUNCTION__, speed);

        IRDA_ASSERT(self != NULL, return;);
        dev = self->netdev;

        last_speed_was_sir = self->io.speed <= SMSC_IRCC2_MAX_SIR_SPEED;

        #if 0
        /* Temp Hack */
        speed= 1152000;
        self->io.speed = speed;
        last_speed_was_sir = 0;
        smsc_ircc_fir_start(self);
        #endif

        if (self->io.speed == 0)
                smsc_ircc_sir_start(self);

        #if 0
        if (!last_speed_was_sir) speed = self->io.speed;
        #endif

        if (self->io.speed != speed)
                smsc_ircc_set_transceiver_for_speed(self, speed);

        self->io.speed = speed;

        if (speed <= SMSC_IRCC2_MAX_SIR_SPEED) {
                if (!last_speed_was_sir) {
                        smsc_ircc_fir_stop(self);
                        smsc_ircc_sir_start(self);
                }
                smsc_ircc_set_sir_speed(self, speed);
        } else {
                if (last_speed_was_sir) {
                        #if SMSC_IRCC2_C_SIR_STOP
                        smsc_ircc_sir_stop(self);
                        #endif
                        smsc_ircc_fir_start(self);
                }
                smsc_ircc_set_fir_speed(self, speed);

                #if 0
                self->tx_buff.len = 10;
                self->tx_buff.data = self->tx_buff.head;

                smsc_ircc_dma_xmit(self, 4000);
                #endif
                /* Be ready for incoming frames */
                smsc_ircc_dma_receive(self);
        }

        netif_wake_queue(dev);
}

/*
 * Function smsc_ircc_set_sir_speed (self, speed)
 *
 *    Set speed of IrDA port to specified baudrate
 *
 */
void smsc_ircc_set_sir_speed(struct smsc_ircc_cb *self, __u32 speed)
{
        int iobase;
        int fcr;    /* FIFO control reg */
        int lcr;    /* Line control reg */
        int divisor;

        IRDA_DEBUG(0, "%s(), Setting speed to: %d\n", __FUNCTION__, speed);

        IRDA_ASSERT(self != NULL, return;);
        iobase = self->io.sir_base;

        /* Update accounting for new speed */
        self->io.speed = speed;

        /* Turn off interrupts */
        outb(0, iobase + UART_IER);

        divisor = SMSC_IRCC2_MAX_SIR_SPEED / speed;

        fcr = UART_FCR_ENABLE_FIFO;

        /*
         * Use trigger level 1 to avoid 3 ms. timeout delay at 9600 bps, and
         * almost 1,7 ms at 19200 bps. At speeds above that we can just forget
         * about this timeout since it will always be fast enough.
         */
        fcr |= self->io.speed < 38400 ?
                UART_FCR_TRIGGER_1 : UART_FCR_TRIGGER_14;

        /* IrDA ports use 8N1 */
        lcr = UART_LCR_WLEN8;

        outb(UART_LCR_DLAB | lcr, iobase + UART_LCR); /* Set DLAB */
        outb(divisor & 0xff,      iobase + UART_DLL); /* Set speed */
        outb(divisor >> 8,        iobase + UART_DLM);
        outb(lcr,                 iobase + UART_LCR); /* Set 8N1 */
        outb(fcr,                 iobase + UART_FCR); /* Enable FIFO's */

        /* Turn on interrups */
        outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);

        IRDA_DEBUG(2, "%s() speed changed to: %d\n", __FUNCTION__, speed);
}


/*
 * Function smsc_ircc_hard_xmit_fir (skb, dev)
 *
 *    Transmit the frame!
 *
 */
static int smsc_ircc_hard_xmit_fir(struct sk_buff *skb, struct net_device *dev)
{
        struct smsc_ircc_cb *self;
        unsigned long flags;
        s32 speed;
        int mtt;

        IRDA_ASSERT(dev != NULL, return 0;);
        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return 0;);

        netif_stop_queue(dev);

        /* Make sure test of self->io.speed & speed change are atomic */
        spin_lock_irqsave(&self->lock, flags);

        /* Check if we need to change the speed after this frame */
        speed = irda_get_next_speed(skb);
        if (speed != self->io.speed && speed != -1) {
                /* Check for empty frame */
                if (!skb->len) {
                        /* Note : you should make sure that speed changes
                         * are not going to corrupt any outgoing frame.
                         * Look at nsc-ircc for the gory details - Jean II */
                        smsc_ircc_change_speed(self, speed);
                        spin_unlock_irqrestore(&self->lock, flags);
                        dev_kfree_skb(skb);
                        return 0;
                }

                self->new_speed = speed;
        }

        memcpy(self->tx_buff.head, skb->data, skb->len);

        self->tx_buff.len = skb->len;
        self->tx_buff.data = self->tx_buff.head;

        mtt = irda_get_mtt(skb);
        if (mtt) {
                int bofs;

                /*
                 * Compute how many BOFs (STA or PA's) we need to waste the
                 * min turn time given the speed of the link.
                 */
                bofs = mtt * (self->io.speed / 1000) / 8000;
                if (bofs > 4095)
                        bofs = 4095;

                smsc_ircc_dma_xmit(self, bofs);
        } else {
                /* Transmit frame */
                smsc_ircc_dma_xmit(self, 0);
        }

        spin_unlock_irqrestore(&self->lock, flags);
        dev_kfree_skb(skb);

        return 0;
}

/*
 * Function smsc_ircc_dma_xmit (self, bofs)
 *
 *    Transmit data using DMA
 *
 */
static void smsc_ircc_dma_xmit(struct smsc_ircc_cb *self, int bofs)
{
        int iobase = self->io.fir_base;
        u8 ctrl;

        IRDA_DEBUG(3, "%s\n", __FUNCTION__);
#if 1
        /* Disable Rx */
        register_bank(iobase, 0);
        outb(0x00, iobase + IRCC_LCR_B);
#endif
        register_bank(iobase, 1);
        outb(inb(iobase + IRCC_SCE_CFGB) & ~IRCC_CFGB_DMA_ENABLE,
             iobase + IRCC_SCE_CFGB);

        self->io.direction = IO_XMIT;

        /* Set BOF additional count for generating the min turn time */
        register_bank(iobase, 4);
        outb(bofs & 0xff, iobase + IRCC_BOF_COUNT_LO);
        ctrl = inb(iobase + IRCC_CONTROL) & 0xf0;
        outb(ctrl | ((bofs >> 8) & 0x0f), iobase + IRCC_BOF_COUNT_HI);

        /* Set max Tx frame size */
        outb(self->tx_buff.len >> 8, iobase + IRCC_TX_SIZE_HI);
        outb(self->tx_buff.len & 0xff, iobase + IRCC_TX_SIZE_LO);

        /*outb(UART_MCR_OUT2, self->io.sir_base + UART_MCR);*/

        /* Enable burst mode chip Tx DMA */
        register_bank(iobase, 1);
        outb(inb(iobase + IRCC_SCE_CFGB) | IRCC_CFGB_DMA_ENABLE |
             IRCC_CFGB_DMA_BURST, iobase + IRCC_SCE_CFGB);

        /* Setup DMA controller (must be done after enabling chip DMA) */
        irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
                       DMA_TX_MODE);

        /* Enable interrupt */

        register_bank(iobase, 0);
        outb(IRCC_IER_ACTIVE_FRAME | IRCC_IER_EOM, iobase + IRCC_IER);
        outb(IRCC_MASTER_INT_EN, iobase + IRCC_MASTER);

        /* Enable transmit */
        outb(IRCC_LCR_B_SCE_TRANSMIT | IRCC_LCR_B_SIP_ENABLE, iobase + IRCC_LCR_B);
}

/*
 * Function smsc_ircc_dma_xmit_complete (self)
 *
 *    The transfer of a frame in finished. This function will only be called
 *    by the interrupt handler
 *
 */
static void smsc_ircc_dma_xmit_complete(struct smsc_ircc_cb *self)
{
        int iobase = self->io.fir_base;

        IRDA_DEBUG(3, "%s\n", __FUNCTION__);
#if 0
        /* Disable Tx */
        register_bank(iobase, 0);
        outb(0x00, iobase + IRCC_LCR_B);
#endif
        register_bank(iobase, 1);
        outb(inb(iobase + IRCC_SCE_CFGB) & ~IRCC_CFGB_DMA_ENABLE,
             iobase + IRCC_SCE_CFGB);

        /* Check for underrun! */
        register_bank(iobase, 0);
        if (inb(iobase + IRCC_LSR) & IRCC_LSR_UNDERRUN) {
                self->stats.tx_errors++;
                self->stats.tx_fifo_errors++;

                /* Reset error condition */
                register_bank(iobase, 0);
                outb(IRCC_MASTER_ERROR_RESET, iobase + IRCC_MASTER);
                outb(0x00, iobase + IRCC_MASTER);
        } else {
                self->stats.tx_packets++;
                self->stats.tx_bytes += self->tx_buff.len;
        }

        /* Check if it's time to change the speed */
        if (self->new_speed) {
                smsc_ircc_change_speed(self, self->new_speed);
                self->new_speed = 0;
        }

        netif_wake_queue(self->netdev);
}

/*
 * Function smsc_ircc_dma_receive(self)
 *
 *    Get ready for receiving a frame. The device will initiate a DMA
 *    if it starts to receive a frame.
 *
 */
static int smsc_ircc_dma_receive(struct smsc_ircc_cb *self)
{
        int iobase = self->io.fir_base;
#if 0
        /* Turn off chip DMA */
        register_bank(iobase, 1);
        outb(inb(iobase + IRCC_SCE_CFGB) & ~IRCC_CFGB_DMA_ENABLE,
             iobase + IRCC_SCE_CFGB);
#endif

        /* Disable Tx */
        register_bank(iobase, 0);
        outb(0x00, iobase + IRCC_LCR_B);

        /* Turn off chip DMA */
        register_bank(iobase, 1);
        outb(inb(iobase + IRCC_SCE_CFGB) & ~IRCC_CFGB_DMA_ENABLE,
             iobase + IRCC_SCE_CFGB);

        self->io.direction = IO_RECV;
        self->rx_buff.data = self->rx_buff.head;

        /* Set max Rx frame size */
        register_bank(iobase, 4);
        outb((2050 >> 8) & 0x0f, iobase + IRCC_RX_SIZE_HI);
        outb(2050 & 0xff, iobase + IRCC_RX_SIZE_LO);

        /* Setup DMA controller */
        irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
                       DMA_RX_MODE);

        /* Enable burst mode chip Rx DMA */
        register_bank(iobase, 1);
        outb(inb(iobase + IRCC_SCE_CFGB) | IRCC_CFGB_DMA_ENABLE |
             IRCC_CFGB_DMA_BURST, iobase + IRCC_SCE_CFGB);

        /* Enable interrupt */
        register_bank(iobase, 0);
        outb(IRCC_IER_ACTIVE_FRAME | IRCC_IER_EOM, iobase + IRCC_IER);
        outb(IRCC_MASTER_INT_EN, iobase + IRCC_MASTER);

        /* Enable receiver */
        register_bank(iobase, 0);
        outb(IRCC_LCR_B_SCE_RECEIVE | IRCC_LCR_B_SIP_ENABLE,
             iobase + IRCC_LCR_B);

        return 0;
}

/*
 * Function smsc_ircc_dma_receive_complete(self)
 *
 *    Finished with receiving frames
 *
 */
static void smsc_ircc_dma_receive_complete(struct smsc_ircc_cb *self)
{
        struct sk_buff *skb;
        int len, msgcnt, lsr;
        int iobase = self->io.fir_base;

        register_bank(iobase, 0);

        IRDA_DEBUG(3, "%s\n", __FUNCTION__);
#if 0
        /* Disable Rx */
        register_bank(iobase, 0);
        outb(0x00, iobase + IRCC_LCR_B);
#endif
        register_bank(iobase, 0);
        outb(inb(iobase + IRCC_LSAR) & ~IRCC_LSAR_ADDRESS_MASK, iobase + IRCC_LSAR);
        lsr= inb(iobase + IRCC_LSR);
        msgcnt = inb(iobase + IRCC_LCR_B) & 0x08;

        IRDA_DEBUG(2, "%s: dma count = %d\n", __FUNCTION__,
                   get_dma_residue(self->io.dma));

        len = self->rx_buff.truesize - get_dma_residue(self->io.dma);

        /* Look for errors */
        if (lsr & (IRCC_LSR_FRAME_ERROR | IRCC_LSR_CRC_ERROR | IRCC_LSR_SIZE_ERROR)) {
                self->stats.rx_errors++;
                if (lsr & IRCC_LSR_FRAME_ERROR)
                        self->stats.rx_frame_errors++;
                if (lsr & IRCC_LSR_CRC_ERROR)
                        self->stats.rx_crc_errors++;
                if (lsr & IRCC_LSR_SIZE_ERROR)
                        self->stats.rx_length_errors++;
                if (lsr & (IRCC_LSR_UNDERRUN | IRCC_LSR_OVERRUN))
                        self->stats.rx_length_errors++;
                return;
        }

        /* Remove CRC */
        len -= self->io.speed < 4000000 ? 2 : 4;

        if (len < 2 || len > 2050) {
                IRDA_WARNING("%s(), bogus len=%d\n", __FUNCTION__, len);
                return;
        }
        IRDA_DEBUG(2, "%s: msgcnt = %d, len=%d\n", __FUNCTION__, msgcnt, len);

        skb = dev_alloc_skb(len + 1);
        if (!skb) {
                IRDA_WARNING("%s(), memory squeeze, dropping frame.\n",
                             __FUNCTION__);
                return;
        }
        /* Make sure IP header gets aligned */
        skb_reserve(skb, 1);

        memcpy(skb_put(skb, len), self->rx_buff.data, len);
        self->stats.rx_packets++;
        self->stats.rx_bytes += len;

        skb->dev = self->netdev;
        skb->mac.raw  = skb->data;
        skb->protocol = htons(ETH_P_IRDA);
        netif_rx(skb);
}

/*
 * Function smsc_ircc_sir_receive (self)
 *
 *    Receive one frame from the infrared port
 *
 */
static void smsc_ircc_sir_receive(struct smsc_ircc_cb *self)
{
        int boguscount = 0;
        int iobase;

        IRDA_ASSERT(self != NULL, return;);

        iobase = self->io.sir_base;

        /*
         * Receive all characters in Rx FIFO, unwrap and unstuff them.
         * async_unwrap_char will deliver all found frames
         */
        do {
                async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
                                  inb(iobase + UART_RX));

                /* Make sure we don't stay here to long */
                if (boguscount++ > 32) {
                        IRDA_DEBUG(2, "%s(), breaking!\n", __FUNCTION__);
                        break;
                }
        } while (inb(iobase + UART_LSR) & UART_LSR_DR);
}


/*
 * Function smsc_ircc_interrupt (irq, dev_id, regs)
 *
 *    An interrupt from the chip has arrived. Time to do some work
 *
 */
static irqreturn_t smsc_ircc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
        struct net_device *dev = (struct net_device *) dev_id;
        struct smsc_ircc_cb *self;
        int iobase, iir, lcra, lsr;
        irqreturn_t ret = IRQ_NONE;

        if (dev == NULL) {
                printk(KERN_WARNING "%s: irq %d for unknown device.\n",
                       driver_name, irq);
                goto irq_ret;
        }

        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return IRQ_NONE;);

        /* Serialise the interrupt handler in various CPUs, stop Tx path */
        spin_lock(&self->lock);

        /* Check if we should use the SIR interrupt handler */
        if (self->io.speed <= SMSC_IRCC2_MAX_SIR_SPEED) {
                ret = smsc_ircc_interrupt_sir(dev);
                goto irq_ret_unlock;
        }

        iobase = self->io.fir_base;

        register_bank(iobase, 0);
        iir = inb(iobase + IRCC_IIR);
        if (iir == 0)
                goto irq_ret_unlock;
        ret = IRQ_HANDLED;

        /* Disable interrupts */
        outb(0, iobase + IRCC_IER);
        lcra = inb(iobase + IRCC_LCR_A);
        lsr = inb(iobase + IRCC_LSR);

        IRDA_DEBUG(2, "%s(), iir = 0x%02x\n", __FUNCTION__, iir);

        if (iir & IRCC_IIR_EOM) {
                if (self->io.direction == IO_RECV)
                        smsc_ircc_dma_receive_complete(self);
                else
                        smsc_ircc_dma_xmit_complete(self);

                smsc_ircc_dma_receive(self);
        }

        if (iir & IRCC_IIR_ACTIVE_FRAME) {
                /*printk(KERN_WARNING "%s(): Active Frame\n", __FUNCTION__);*/
        }

        /* Enable interrupts again */

        register_bank(iobase, 0);
        outb(IRCC_IER_ACTIVE_FRAME | IRCC_IER_EOM, iobase + IRCC_IER);

 irq_ret_unlock:
        spin_unlock(&self->lock);
 irq_ret:
        return ret;
}

/*
 * Function irport_interrupt_sir (irq, dev_id, regs)
 *
 *    Interrupt handler for SIR modes
 */
static irqreturn_t smsc_ircc_interrupt_sir(struct net_device *dev)
{
        struct smsc_ircc_cb *self = netdev_priv(dev);
        int boguscount = 0;
        int iobase;
        int iir, lsr;

        /* Already locked comming here in smsc_ircc_interrupt() */
        /*spin_lock(&self->lock);*/

        iobase = self->io.sir_base;

        iir = inb(iobase + UART_IIR) & UART_IIR_ID;
        if (iir == 0)
                return IRQ_NONE;
        while (iir) {
                /* Clear interrupt */
                lsr = inb(iobase + UART_LSR);

                IRDA_DEBUG(4, "%s(), iir=%02x, lsr=%02x, iobase=%#x\n",
                            __FUNCTION__, iir, lsr, iobase);

                switch (iir) {
                case UART_IIR_RLSI:
                        IRDA_DEBUG(2, "%s(), RLSI\n", __FUNCTION__);
                        break;
                case UART_IIR_RDI:
                        /* Receive interrupt */
                        smsc_ircc_sir_receive(self);
                        break;
                case UART_IIR_THRI:
                        if (lsr & UART_LSR_THRE)
                                /* Transmitter ready for data */
                                smsc_ircc_sir_write_wakeup(self);
                        break;
                default:
                        IRDA_DEBUG(0, "%s(), unhandled IIR=%#x\n",
                                   __FUNCTION__, iir);
                        break;
                }

                /* Make sure we don't stay here to long */
                if (boguscount++ > 100)
                        break;

                iir = inb(iobase + UART_IIR) & UART_IIR_ID;
        }
        /*spin_unlock(&self->lock);*/
        return IRQ_HANDLED;
}


#if 0 /* unused */
/*
 * Function ircc_is_receiving (self)
 *
 *    Return TRUE is we are currently receiving a frame
 *
 */
static int ircc_is_receiving(struct smsc_ircc_cb *self)
{
        int status = FALSE;
        /* int iobase; */

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return FALSE;);

        IRDA_DEBUG(0, "%s: dma count = %d\n", __FUNCTION__,
                   get_dma_residue(self->io.dma));

        status = (self->rx_buff.state != OUTSIDE_FRAME);

        return status;
}
#endif /* unused */


/*
 * Function smsc_ircc_net_open (dev)
 *
 *    Start the device
 *
 */
static int smsc_ircc_net_open(struct net_device *dev)
{
        struct smsc_ircc_cb *self;
        char hwname[16];
        unsigned long flags;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(dev != NULL, return -1;);
        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return 0;);

        if (request_irq(self->io.irq, smsc_ircc_interrupt, 0, dev->name,
                        (void *) dev)) {
                IRDA_DEBUG(0, "%s(), unable to allocate irq=%d\n",
                           __FUNCTION__, self->io.irq);
                return -EAGAIN;
        }

        spin_lock_irqsave(&self->lock, flags);
        /*smsc_ircc_sir_start(self);*/
        self->io.speed = 0;
        smsc_ircc_change_speed(self, SMSC_IRCC2_C_IRDA_FALLBACK_SPEED);
        spin_unlock_irqrestore(&self->lock, flags);

        /* Give self a hardware name */
        /* It would be cool to offer the chip revision here - Jean II */
        sprintf(hwname, "SMSC @ 0x%03x", self->io.fir_base);

        /*
         * Open new IrLAP layer instance, now that everything should be
         * initialized properly
         */
        self->irlap = irlap_open(dev, &self->qos, hwname);

        /*
         * Always allocate the DMA channel after the IRQ,
         * and clean up on failure.
         */
        if (request_dma(self->io.dma, dev->name)) {
                smsc_ircc_net_close(dev);

                IRDA_WARNING("%s(), unable to allocate DMA=%d\n",
                             __FUNCTION__, self->io.dma);
                return -EAGAIN;
        }

        netif_start_queue(dev);

        return 0;
}

/*
 * Function smsc_ircc_net_close (dev)
 *
 *    Stop the device
 *
 */
static int smsc_ircc_net_close(struct net_device *dev)
{
        struct smsc_ircc_cb *self;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(dev != NULL, return -1;);
        self = netdev_priv(dev);
        IRDA_ASSERT(self != NULL, return 0;);

        /* Stop device */
        netif_stop_queue(dev);

        /* Stop and remove instance of IrLAP */
        if (self->irlap)
                irlap_close(self->irlap);
        self->irlap = NULL;

        free_irq(self->io.irq, dev);
        disable_dma(self->io.dma);
        free_dma(self->io.dma);

        return 0;
}

static int smsc_ircc_suspend(struct device *dev, pm_message_t state, u32 level)
{
        struct smsc_ircc_cb *self = dev_get_drvdata(dev);

        IRDA_MESSAGE("%s, Suspending\n", driver_name);

        if (level == SUSPEND_DISABLE && !self->io.suspended) {
                smsc_ircc_net_close(self->netdev);
                self->io.suspended = 1;
        }

        return 0;
}

static int smsc_ircc_resume(struct device *dev, u32 level)
{
        struct smsc_ircc_cb *self = dev_get_drvdata(dev);

        if (level == RESUME_ENABLE && self->io.suspended) {

                smsc_ircc_net_open(self->netdev);
                self->io.suspended = 0;

                IRDA_MESSAGE("%s, Waking up\n", driver_name);
        }
        return 0;
}

/*
 * Function smsc_ircc_close (self)
 *
 *    Close driver instance
 *
 */
static int __exit smsc_ircc_close(struct smsc_ircc_cb *self)
{
        int iobase;
        unsigned long flags;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return -1;);

        platform_device_unregister(self->pldev);

        /* Remove netdevice */
        unregister_netdev(self->netdev);

        /* Make sure the irq handler is not exectuting */
        spin_lock_irqsave(&self->lock, flags);

        /* Stop interrupts */
        iobase = self->io.fir_base;
        register_bank(iobase, 0);
        outb(0, iobase + IRCC_IER);
        outb(IRCC_MASTER_RESET, iobase + IRCC_MASTER);
        outb(0x00, iobase + IRCC_MASTER);
#if 0
        /* Reset to SIR mode */
        register_bank(iobase, 1);
        outb(IRCC_CFGA_IRDA_SIR_A|IRCC_CFGA_TX_POLARITY, iobase + IRCC_SCE_CFGA);
        outb(IRCC_CFGB_IR, iobase + IRCC_SCE_CFGB);
#endif
        spin_unlock_irqrestore(&self->lock, flags);

        /* Release the PORTS that this driver is using */
        IRDA_DEBUG(0, "%s(), releasing 0x%03x\n",  __FUNCTION__,
                   self->io.fir_base);

        release_region(self->io.fir_base, self->io.fir_ext);

        IRDA_DEBUG(0, "%s(), releasing 0x%03x\n", __FUNCTION__,
                   self->io.sir_base);

        release_region(self->io.sir_base, self->io.sir_ext);

        if (self->tx_buff.head)
                dma_free_coherent(NULL, self->tx_buff.truesize,
                                  self->tx_buff.head, self->tx_buff_dma);

        if (self->rx_buff.head)
                dma_free_coherent(NULL, self->rx_buff.truesize,
                                  self->rx_buff.head, self->rx_buff_dma);

        free_netdev(self->netdev);

        return 0;
}

static void __exit smsc_ircc_cleanup(void)
{
        int i;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        for (i = 0; i < 2; i++) {
                if (dev_self[i])
                        smsc_ircc_close(dev_self[i]);
        }

        driver_unregister(&smsc_ircc_driver);
}

/*
 *      Start SIR operations
 *
 * This function *must* be called with spinlock held, because it may
 * be called from the irq handler (via smsc_ircc_change_speed()). - Jean II
 */
void smsc_ircc_sir_start(struct smsc_ircc_cb *self)
{
        struct net_device *dev;
        int fir_base, sir_base;

        IRDA_DEBUG(3, "%s\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return;);
        dev = self->netdev;
        IRDA_ASSERT(dev != NULL, return;);
        dev->hard_start_xmit = &smsc_ircc_hard_xmit_sir;

        fir_base = self->io.fir_base;
        sir_base = self->io.sir_base;

        /* Reset everything */
        outb(IRCC_MASTER_RESET, fir_base + IRCC_MASTER);

        #if SMSC_IRCC2_C_SIR_STOP
        /*smsc_ircc_sir_stop(self);*/
        #endif

        register_bank(fir_base, 1);
        outb(((inb(fir_base + IRCC_SCE_CFGA) & IRCC_SCE_CFGA_BLOCK_CTRL_BITS_MASK) | IRCC_CFGA_IRDA_SIR_A), fir_base + IRCC_SCE_CFGA);

        /* Initialize UART */
        outb(UART_LCR_WLEN8, sir_base + UART_LCR);  /* Reset DLAB */
        outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), sir_base + UART_MCR);

        /* Turn on interrups */
        outb(UART_IER_RLSI | UART_IER_RDI |UART_IER_THRI, sir_base + UART_IER);

        IRDA_DEBUG(3, "%s() - exit\n", __FUNCTION__);

        outb(0x00, fir_base + IRCC_MASTER);
}

#if SMSC_IRCC2_C_SIR_STOP
void smsc_ircc_sir_stop(struct smsc_ircc_cb *self)
{
        int iobase;

        IRDA_DEBUG(3, "%s\n", __FUNCTION__);
        iobase = self->io.sir_base;

        /* Reset UART */
        outb(0, iobase + UART_MCR);

        /* Turn off interrupts */
        outb(0, iobase + UART_IER);
}
#endif

/*
 * Function smsc_sir_write_wakeup (self)
 *
 *    Called by the SIR interrupt handler when there's room for more data.
 *    If we have more packets to send, we send them here.
 *
 */
static void smsc_ircc_sir_write_wakeup(struct smsc_ircc_cb *self)
{
        int actual = 0;
        int iobase;
        int fcr;

        IRDA_ASSERT(self != NULL, return;);

        IRDA_DEBUG(4, "%s\n", __FUNCTION__);

        iobase = self->io.sir_base;

        /* Finished with frame?  */
        if (self->tx_buff.len > 0)  {
                /* Write data left in transmit buffer */
                actual = smsc_ircc_sir_write(iobase, self->io.fifo_size,
                                      self->tx_buff.data, self->tx_buff.len);
                self->tx_buff.data += actual;
                self->tx_buff.len  -= actual;
        } else {

        /*if (self->tx_buff.len ==0)  {*/

                /*
                 *  Now serial buffer is almost free & we can start
                 *  transmission of another packet. But first we must check
                 *  if we need to change the speed of the hardware
                 */
                if (self->new_speed) {
                        IRDA_DEBUG(5, "%s(), Changing speed to %d.\n",
                                   __FUNCTION__, self->new_speed);
                        smsc_ircc_sir_wait_hw_transmitter_finish(self);
                        smsc_ircc_change_speed(self, self->new_speed);
                        self->new_speed = 0;
                } else {
                        /* Tell network layer that we want more frames */
                        netif_wake_queue(self->netdev);
                }
                self->stats.tx_packets++;

                if (self->io.speed <= 115200) {
                        /*
                         * Reset Rx FIFO to make sure that all reflected transmit data
                         * is discarded. This is needed for half duplex operation
                         */
                        fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR;
                        fcr |= self->io.speed < 38400 ?
                                        UART_FCR_TRIGGER_1 : UART_FCR_TRIGGER_14;

                        outb(fcr, iobase + UART_FCR);

                        /* Turn on receive interrupts */
                        outb(UART_IER_RDI, iobase + UART_IER);
                }
        }
}

/*
 * Function smsc_ircc_sir_write (iobase, fifo_size, buf, len)
 *
 *    Fill Tx FIFO with transmit data
 *
 */
static int smsc_ircc_sir_write(int iobase, int fifo_size, __u8 *buf, int len)
{
        int actual = 0;

        /* Tx FIFO should be empty! */
        if (!(inb(iobase + UART_LSR) & UART_LSR_THRE)) {
                IRDA_WARNING("%s(), failed, fifo not empty!\n", __FUNCTION__);
                return 0;
        }

        /* Fill FIFO with current frame */
        while (fifo_size-- > 0 && actual < len) {
                /* Transmit next byte */
                outb(buf[actual], iobase + UART_TX);
                actual++;
        }
        return actual;
}

/*
 * Function smsc_ircc_is_receiving (self)
 *
 *    Returns true is we are currently receiving data
 *
 */
static int smsc_ircc_is_receiving(struct smsc_ircc_cb *self)
{
        return (self->rx_buff.state != OUTSIDE_FRAME);
}


/*
 * Function smsc_ircc_probe_transceiver(self)
 *
 *    Tries to find the used Transceiver
 *
 */
static void smsc_ircc_probe_transceiver(struct smsc_ircc_cb *self)
{
        unsigned int    i;

        IRDA_ASSERT(self != NULL, return;);

        for (i = 0; smsc_transceivers[i].name != NULL; i++)
                if (smsc_transceivers[i].probe(self->io.fir_base)) {
                        IRDA_MESSAGE(" %s transceiver found\n",
                                     smsc_transceivers[i].name);
                        self->transceiver= i + 1;
                        return;
                }

        IRDA_MESSAGE("No transceiver found. Defaulting to %s\n",
                     smsc_transceivers[SMSC_IRCC2_C_DEFAULT_TRANSCEIVER].name);

        self->transceiver = SMSC_IRCC2_C_DEFAULT_TRANSCEIVER;
}


/*
 * Function smsc_ircc_set_transceiver_for_speed(self, speed)
 *
 *    Set the transceiver according to the speed
 *
 */
static void smsc_ircc_set_transceiver_for_speed(struct smsc_ircc_cb *self, u32 speed)
{
        unsigned int trx;

        trx = self->transceiver;
        if (trx > 0)
                smsc_transceivers[trx - 1].set_for_speed(self->io.fir_base, speed);
}

/*
 * Function smsc_ircc_wait_hw_transmitter_finish ()
 *
 *    Wait for the real end of HW transmission
 *
 * The UART is a strict FIFO, and we get called only when we have finished
 * pushing data to the FIFO, so the maximum amount of time we must wait
 * is only for the FIFO to drain out.
 *
 * We use a simple calibrated loop. We may need to adjust the loop
 * delay (udelay) to balance I/O traffic and latency. And we also need to
 * adjust the maximum timeout.
 * It would probably be better to wait for the proper interrupt,
 * but it doesn't seem to be available.
 *
 * We can't use jiffies or kernel timers because :
 * 1) We are called from the interrupt handler, which disable softirqs,
 * so jiffies won't be increased
 * 2) Jiffies granularity is usually very coarse (10ms), and we don't
 * want to wait that long to detect stuck hardware.
 * Jean II
 */

static void smsc_ircc_sir_wait_hw_transmitter_finish(struct smsc_ircc_cb *self)
{
        int iobase = self->io.sir_base;
        int count = SMSC_IRCC2_HW_TRANSMITTER_TIMEOUT_US;

        /* Calibrated busy loop */
        while (count-- > 0 && !(inb(iobase + UART_LSR) & UART_LSR_TEMT))
                udelay(1);

        if (count == 0)
                IRDA_DEBUG(0, "%s(): stuck transmitter\n", __FUNCTION__);
}


/* PROBING
 *
 *
 */

static int __init smsc_ircc_look_for_chips(void)
{
        struct smsc_chip_address *address;
        char *type;
        unsigned int cfg_base, found;

        found = 0;
        address = possible_addresses;

        while (address->cfg_base) {
                cfg_base = address->cfg_base;

                /*printk(KERN_WARNING "%s(): probing: 0x%02x for: 0x%02x\n", __FUNCTION__, cfg_base, address->type);*/

                if (address->type & SMSCSIO_TYPE_FDC) {
                        type = "FDC";
                        if (address->type & SMSCSIO_TYPE_FLAT)
                                if (!smsc_superio_flat(fdc_chips_flat, cfg_base, type))
                                        found++;

                        if (address->type & SMSCSIO_TYPE_PAGED)
                                if (!smsc_superio_paged(fdc_chips_paged, cfg_base, type))
                                        found++;
                }
                if (address->type & SMSCSIO_TYPE_LPC) {
                        type = "LPC";
                        if (address->type & SMSCSIO_TYPE_FLAT)
                                if (!smsc_superio_flat(lpc_chips_flat, cfg_base, type))
                                        found++;

                        if (address->type & SMSCSIO_TYPE_PAGED)
                                if (!smsc_superio_paged(lpc_chips_paged, cfg_base, type))
                                        found++;
                }
                address++;
        }
        return found;
}

/*
 * Function smsc_superio_flat (chip, base, type)
 *
 *    Try to get configuration of a smc SuperIO chip with flat register model
 *
 */
static int __init smsc_superio_flat(const struct smsc_chip *chips, unsigned short cfgbase, char *type)
{
        unsigned short firbase, sirbase;
        u8 mode, dma, irq;
        int ret = -ENODEV;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        if (smsc_ircc_probe(cfgbase, SMSCSIOFLAT_DEVICEID_REG, chips, type) == NULL)
                return ret;

        outb(SMSCSIOFLAT_UARTMODE0C_REG, cfgbase);
        mode = inb(cfgbase + 1);

        /*printk(KERN_WARNING "%s(): mode: 0x%02x\n", __FUNCTION__, mode);*/

        if (!(mode & SMSCSIOFLAT_UART2MODE_VAL_IRDA))
                IRDA_WARNING("%s(): IrDA not enabled\n", __FUNCTION__);

        outb(SMSCSIOFLAT_UART2BASEADDR_REG, cfgbase);
        sirbase = inb(cfgbase + 1) << 2;

        /* FIR iobase */
        outb(SMSCSIOFLAT_FIRBASEADDR_REG, cfgbase);
        firbase = inb(cfgbase + 1) << 3;

        /* DMA */
        outb(SMSCSIOFLAT_FIRDMASELECT_REG, cfgbase);
        dma = inb(cfgbase + 1) & SMSCSIOFLAT_FIRDMASELECT_MASK;

        /* IRQ */
        outb(SMSCSIOFLAT_UARTIRQSELECT_REG, cfgbase);
        irq = inb(cfgbase + 1) & SMSCSIOFLAT_UART2IRQSELECT_MASK;

        IRDA_MESSAGE("%s(): fir: 0x%02x, sir: 0x%02x, dma: %02d, irq: %d, mode: 0x%02x\n", __FUNCTION__, firbase, sirbase, dma, irq, mode);

        if (firbase && smsc_ircc_open(firbase, sirbase, dma, irq) == 0)
                ret = 0;

        /* Exit configuration */
        outb(SMSCSIO_CFGEXITKEY, cfgbase);

        return ret;
}

/*
 * Function smsc_superio_paged (chip, base, type)
 *
 *    Try  to get configuration of a smc SuperIO chip with paged register model
 *
 */
static int __init smsc_superio_paged(const struct smsc_chip *chips, unsigned short cfg_base, char *type)
{
        unsigned short fir_io, sir_io;
        int ret = -ENODEV;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        if (smsc_ircc_probe(cfg_base, 0x20, chips, type) == NULL)
                return ret;

        /* Select logical device (UART2) */
        outb(0x07, cfg_base);
        outb(0x05, cfg_base + 1);

        /* SIR iobase */
        outb(0x60, cfg_base);
        sir_io = inb(cfg_base + 1) << 8;
        outb(0x61, cfg_base);
        sir_io |= inb(cfg_base + 1);

        /* Read FIR base */
        outb(0x62, cfg_base);
        fir_io = inb(cfg_base + 1) << 8;
        outb(0x63, cfg_base);
        fir_io |= inb(cfg_base + 1);
        outb(0x2b, cfg_base); /* ??? */

        if (fir_io && smsc_ircc_open(fir_io, sir_io, ircc_dma, ircc_irq) == 0)
                ret = 0;

        /* Exit configuration */
        outb(SMSCSIO_CFGEXITKEY, cfg_base);

        return ret;
}


static int __init smsc_access(unsigned short cfg_base, unsigned char reg)
{
        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        outb(reg, cfg_base);
        return inb(cfg_base) != reg ? -1 : 0;
}

static const struct smsc_chip * __init smsc_ircc_probe(unsigned short cfg_base, u8 reg, const struct smsc_chip *chip, char *type)
{
        u8 devid, xdevid, rev;

        IRDA_DEBUG(1, "%s\n", __FUNCTION__);

        /* Leave configuration */

        outb(SMSCSIO_CFGEXITKEY, cfg_base);

        if (inb(cfg_base) == SMSCSIO_CFGEXITKEY)        /* not a smc superio chip */
                return NULL;

        outb(reg, cfg_base);

        xdevid = inb(cfg_base + 1);

        /* Enter configuration */

        outb(SMSCSIO_CFGACCESSKEY, cfg_base);

        #if 0
        if (smsc_access(cfg_base,0x55)) /* send second key and check */
                return NULL;
        #endif

        /* probe device ID */

        if (smsc_access(cfg_base, reg))
                return NULL;

        devid = inb(cfg_base + 1);

        if (devid == 0 || devid == 0xff)        /* typical values for unused port */
                return NULL;

        /* probe revision ID */

        if (smsc_access(cfg_base, reg + 1))
                return NULL;

        rev = inb(cfg_base + 1);

        if (rev >= 128)                 /* i think this will make no sense */
                return NULL;

        if (devid == xdevid)            /* protection against false positives */
                return NULL;

        /* Check for expected device ID; are there others? */

        while (chip->devid != devid) {

                chip++;

                if (chip->name == NULL)
                        return NULL;
        }

        IRDA_MESSAGE("found SMC SuperIO Chip (devid=0x%02x rev=%02X base=0x%04x): %s%s\n",
                     devid, rev, cfg_base, type, chip->name);

        if (chip->rev > rev) {
                IRDA_MESSAGE("Revision higher than expected\n");
                return NULL;
        }

        if (chip->flags & NoIRDA)
                IRDA_MESSAGE("chipset does not support IRDA\n");

        return chip;
}

static int __init smsc_superio_fdc(unsigned short cfg_base)
{
        int ret = -1;

        if (!request_region(cfg_base, 2, driver_name)) {
                IRDA_WARNING("%s: can't get cfg_base of 0x%03x\n",
                             __FUNCTION__, cfg_base);
        } else {
                if (!smsc_superio_flat(fdc_chips_flat, cfg_base, "FDC") ||
                    !smsc_superio_paged(fdc_chips_paged, cfg_base, "FDC"))
                        ret =  0;

                release_region(cfg_base, 2);
        }

        return ret;
}

static int __init smsc_superio_lpc(unsigned short cfg_base)
{
        int ret = -1;

        if (!request_region(cfg_base, 2, driver_name)) {
                IRDA_WARNING("%s: can't get cfg_base of 0x%03x\n",
                             __FUNCTION__, cfg_base);
        } else {
                if (!smsc_superio_flat(lpc_chips_flat, cfg_base, "LPC") ||
                    !smsc_superio_paged(lpc_chips_paged, cfg_base, "LPC"))
                        ret = 0;

                release_region(cfg_base, 2);
        }
        return ret;
}

/************************************************
 *
 * Transceivers specific functions
 *
 ************************************************/


/*
 * Function smsc_ircc_set_transceiver_smsc_ircc_atc(fir_base, speed)
 *
 *    Program transceiver through smsc-ircc ATC circuitry
 *
 */

static void smsc_ircc_set_transceiver_smsc_ircc_atc(int fir_base, u32 speed)
{
        unsigned long jiffies_now, jiffies_timeout;
        u8 val;

        jiffies_now = jiffies;
        jiffies_timeout = jiffies + SMSC_IRCC2_ATC_PROGRAMMING_TIMEOUT_JIFFIES;

        /* ATC */
        register_bank(fir_base, 4);
        outb((inb(fir_base + IRCC_ATC) & IRCC_ATC_MASK) | IRCC_ATC_nPROGREADY|IRCC_ATC_ENABLE,
             fir_base + IRCC_ATC);

        while ((val = (inb(fir_base + IRCC_ATC) & IRCC_ATC_nPROGREADY)) &&
                !time_after(jiffies, jiffies_timeout))
                /* empty */;

        if (val)
                IRDA_WARNING("%s(): ATC: 0x%02x\n", __FUNCTION__,
                             inb(fir_base + IRCC_ATC));
}

/*
 * Function smsc_ircc_probe_transceiver_smsc_ircc_atc(fir_base)
 *
 *    Probe transceiver smsc-ircc ATC circuitry
 *
 */

static int smsc_ircc_probe_transceiver_smsc_ircc_atc(int fir_base)
{
        return 0;
}

/*
 * Function smsc_ircc_set_transceiver_smsc_ircc_fast_pin_select(self, speed)
 *
 *    Set transceiver
 *
 */

static void smsc_ircc_set_transceiver_smsc_ircc_fast_pin_select(int fir_base, u32 speed)
{
        u8 fast_mode;

        switch (speed) {
        default:
        case 576000 :
                fast_mode = 0;
                break;
        case 1152000 :
        case 4000000 :
                fast_mode = IRCC_LCR_A_FAST;
                break;
        }
        register_bank(fir_base, 0);
        outb((inb(fir_base + IRCC_LCR_A) & 0xbf) | fast_mode, fir_base + IRCC_LCR_A);
}

/*
 * Function smsc_ircc_probe_transceiver_smsc_ircc_fast_pin_select(fir_base)
 *
 *    Probe transceiver
 *
 */

static int smsc_ircc_probe_transceiver_smsc_ircc_fast_pin_select(int fir_base)
{
        return 0;
}

/*
 * Function smsc_ircc_set_transceiver_toshiba_sat1800(fir_base, speed)
 *
 *    Set transceiver
 *
 */

static void smsc_ircc_set_transceiver_toshiba_sat1800(int fir_base, u32 speed)
{
        u8 fast_mode;

        switch (speed) {
        default:
        case 576000 :
                fast_mode = 0;
                break;
        case 1152000 :
        case 4000000 :
                fast_mode = /*IRCC_LCR_A_FAST |*/ IRCC_LCR_A_GP_DATA;
                break;

        }
        /* This causes an interrupt */
        register_bank(fir_base, 0);
        outb((inb(fir_base + IRCC_LCR_A) &  0xbf) | fast_mode, fir_base + IRCC_LCR_A);
}

/*
 * Function smsc_ircc_probe_transceiver_toshiba_sat1800(fir_base)
 *
 *    Probe transceiver
 *
 */

static int smsc_ircc_probe_transceiver_toshiba_sat1800(int fir_base)
{
        return 0;
}


module_init(smsc_ircc_init);
module_exit(smsc_ircc_cleanup);