// SPDX-License-Identifier: GPL-2.0
/*
 * IPWireless 3G PCMCIA Network Driver
 *
 * Original code
 *   by Stephen Blackheath <stephen@blacksapphire.com>,
 *      Ben Martel <benm@symmetric.co.nz>
 *
 * Copyrighted as follows:
 *   Copyright (C) 2004 by Symmetric Systems Ltd (NZ)
 *
 * Various driver changes and rewrites, port to new kernels
 *   Copyright (C) 2006-2007 Jiri Kosina
 *
 * Misc code cleanups and updates
 *   Copyright (C) 2007 David Sterba
 */

#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/slab.h>

#include "hardware.h"
#include "setup_protocol.h"
#include "network.h"
#include "main.h"

static void ipw_send_setup_packet(struct ipw_hardware *hw);
static void handle_received_SETUP_packet(struct ipw_hardware *ipw,
                                         unsigned int address,
                                         const unsigned char *data, int len,
                                         int is_last);
static void ipwireless_setup_timer(struct timer_list *t);
static void handle_received_CTRL_packet(struct ipw_hardware *hw,
                unsigned int channel_idx, const unsigned char *data, int len);

/*#define TIMING_DIAGNOSTICS*/

#ifdef TIMING_DIAGNOSTICS

static struct timing_stats {
        unsigned long last_report_time;
        unsigned long read_time;
        unsigned long write_time;
        unsigned long read_bytes;
        unsigned long write_bytes;
        unsigned long start_time;
};

static void start_timing(void)
{
        timing_stats.start_time = jiffies;
}

static void end_read_timing(unsigned length)
{
        timing_stats.read_time += (jiffies - start_time);
        timing_stats.read_bytes += length + 2;
        report_timing();
}

static void end_write_timing(unsigned length)
{
        timing_stats.write_time += (jiffies - start_time);
        timing_stats.write_bytes += length + 2;
        report_timing();
}

static void report_timing(void)
{
        unsigned long since = jiffies - timing_stats.last_report_time;

        /* If it's been more than one second... */
        if (since >= HZ) {
                int first = (timing_stats.last_report_time == 0);

                timing_stats.last_report_time = jiffies;
                if (!first)
                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                               ": %u us elapsed - read %lu bytes in %u us, wrote %lu bytes in %u us\n",
                               jiffies_to_usecs(since),
                               timing_stats.read_bytes,
                               jiffies_to_usecs(timing_stats.read_time),
                               timing_stats.write_bytes,
                               jiffies_to_usecs(timing_stats.write_time));

                timing_stats.read_time = 0;
                timing_stats.write_time = 0;
                timing_stats.read_bytes = 0;
                timing_stats.write_bytes = 0;
        }
}
#else
static void start_timing(void) { }
static void end_read_timing(unsigned length) { }
static void end_write_timing(unsigned length) { }
#endif

/* Imported IPW definitions */

#define LL_MTU_V1 318
#define LL_MTU_V2 250
#define LL_MTU_MAX (LL_MTU_V1 > LL_MTU_V2 ? LL_MTU_V1 : LL_MTU_V2)

#define PRIO_DATA  2
#define PRIO_CTRL  1
#define PRIO_SETUP 0

/* Addresses */
#define ADDR_SETUP_PROT 0

/* Protocol ids */
enum {
        /* Identifier for the Com Data protocol */
        TL_PROTOCOLID_COM_DATA = 0,

        /* Identifier for the Com Control protocol */
        TL_PROTOCOLID_COM_CTRL = 1,

        /* Identifier for the Setup protocol */
        TL_PROTOCOLID_SETUP = 2
};

/* Number of bytes in NL packet header (cannot do
 * sizeof(nl_packet_header) since it's a bitfield) */
#define NL_FIRST_PACKET_HEADER_SIZE        3

/* Number of bytes in NL packet header (cannot do
 * sizeof(nl_packet_header) since it's a bitfield) */
#define NL_FOLLOWING_PACKET_HEADER_SIZE    1

struct nl_first_packet_header {
        unsigned char protocol:3;
        unsigned char address:3;
        unsigned char packet_rank:2;
        unsigned char length_lsb;
        unsigned char length_msb;
};

struct nl_packet_header {
        unsigned char protocol:3;
        unsigned char address:3;
        unsigned char packet_rank:2;
};

/* Value of 'packet_rank' above */
#define NL_INTERMEDIATE_PACKET    0x0
#define NL_LAST_PACKET            0x1
#define NL_FIRST_PACKET           0x2

union nl_packet {
        /* Network packet header of the first packet (a special case) */
        struct nl_first_packet_header hdr_first;
        /* Network packet header of the following packets (if any) */
        struct nl_packet_header hdr;
        /* Complete network packet (header + data) */
        unsigned char rawpkt[LL_MTU_MAX];
} __attribute__ ((__packed__));

#define HW_VERSION_UNKNOWN -1
#define HW_VERSION_1 1
#define HW_VERSION_2 2

/* IPW I/O ports */
#define IOIER 0x00              /* Interrupt Enable Register */
#define IOIR  0x02              /* Interrupt Source/ACK register */
#define IODCR 0x04              /* Data Control Register */
#define IODRR 0x06              /* Data Read Register */
#define IODWR 0x08              /* Data Write Register */
#define IOESR 0x0A              /* Embedded Driver Status Register */
#define IORXR 0x0C              /* Rx Fifo Register (Host to Embedded) */
#define IOTXR 0x0E              /* Tx Fifo Register (Embedded to Host) */

/* I/O ports and bit definitions for version 1 of the hardware */

/* IER bits*/
#define IER_RXENABLED   0x1
#define IER_TXENABLED   0x2

/* ISR bits */
#define IR_RXINTR       0x1
#define IR_TXINTR       0x2

/* DCR bits */
#define DCR_RXDONE      0x1
#define DCR_TXDONE      0x2
#define DCR_RXRESET     0x4
#define DCR_TXRESET     0x8

/* I/O ports and bit definitions for version 2 of the hardware */

struct MEMCCR {
        unsigned short reg_config_option;       /* PCCOR: Configuration Option Register */
        unsigned short reg_config_and_status;   /* PCCSR: Configuration and Status Register */
        unsigned short reg_pin_replacement;     /* PCPRR: Pin Replacemant Register */
        unsigned short reg_socket_and_copy;     /* PCSCR: Socket and Copy Register */
        unsigned short reg_ext_status;          /* PCESR: Extendend Status Register */
        unsigned short reg_io_base;             /* PCIOB: I/O Base Register */
};

struct MEMINFREG {
        unsigned short memreg_tx_old;   /* TX Register (R/W) */
        unsigned short pad1;
        unsigned short memreg_rx_done;  /* RXDone Register (R/W) */
        unsigned short pad2;
        unsigned short memreg_rx;       /* RX Register (R/W) */
        unsigned short pad3;
        unsigned short memreg_pc_interrupt_ack; /* PC intr Ack Register (W) */
        unsigned short pad4;
        unsigned long memreg_card_present;/* Mask for Host to check (R) for
                                           * CARD_PRESENT_VALUE */
        unsigned short memreg_tx_new;   /* TX2 (new) Register (R/W) */
};

#define CARD_PRESENT_VALUE (0xBEEFCAFEUL)

#define MEMTX_TX                       0x0001
#define MEMRX_RX                       0x0001
#define MEMRX_RX_DONE                  0x0001
#define MEMRX_PCINTACKK                0x0001

#define NL_NUM_OF_PRIORITIES       3
#define NL_NUM_OF_PROTOCOLS        3
#define NL_NUM_OF_ADDRESSES        NO_OF_IPW_CHANNELS

struct ipw_hardware {
        unsigned int base_port;
        short hw_version;
        unsigned short ll_mtu;
        spinlock_t lock;

        int initializing;
        int init_loops;
        struct timer_list setup_timer;

        /* Flag if hw is ready to send next packet */
        int tx_ready;
        /* Count of pending packets to be sent */
        int tx_queued;
        struct list_head tx_queue[NL_NUM_OF_PRIORITIES];

        int rx_bytes_queued;
        struct list_head rx_queue;
        /* Pool of rx_packet structures that are not currently used. */
        struct list_head rx_pool;
        int rx_pool_size;
        /* True if reception of data is blocked while userspace processes it. */
        int blocking_rx;
        /* True if there is RX data ready on the hardware. */
        int rx_ready;
        unsigned short last_memtx_serial;
        /*
         * Newer versions of the V2 card firmware send serial numbers in the
         * MemTX register. 'serial_number_detected' is set true when we detect
         * a non-zero serial number (indicating the new firmware).  Thereafter,
         * the driver can safely ignore the Timer Recovery re-sends to avoid
         * out-of-sync problems.
         */
        int serial_number_detected;
        struct work_struct work_rx;

        /* True if we are to send the set-up data to the hardware. */
        int to_setup;

        /* Card has been removed */
        int removed;
        /* Saved irq value when we disable the interrupt. */
        int irq;
        /* True if this driver is shutting down. */
        int shutting_down;
        /* Modem control lines */
        unsigned int control_lines[NL_NUM_OF_ADDRESSES];
        struct ipw_rx_packet *packet_assembler[NL_NUM_OF_ADDRESSES];

        struct tasklet_struct tasklet;

        /* The handle for the network layer, for the sending of events to it. */
        struct ipw_network *network;
        struct MEMINFREG __iomem *memory_info_regs;
        struct MEMCCR __iomem *memregs_CCR;
        void (*reboot_callback) (void *data);
        void *reboot_callback_data;

        unsigned short __iomem *memreg_tx;
};

/*
 * Packet info structure for tx packets.
 * Note: not all the fields defined here are required for all protocols
 */
struct ipw_tx_packet {
        struct list_head queue;
        /* channel idx + 1 */
        unsigned char dest_addr;
        /* SETUP, CTRL or DATA */
        unsigned char protocol;
        /* Length of data block, which starts at the end of this structure */
        unsigned short length;
        /* Sending state */
        /* Offset of where we've sent up to so far */
        unsigned long offset;
        /* Count of packet fragments, starting at 0 */
        int fragment_count;

        /* Called after packet is sent and before is freed */
        void (*packet_callback) (void *cb_data, unsigned int packet_length);
        void *callback_data;
};

/* Signals from DTE */
#define COMCTRL_RTS     0
#define COMCTRL_DTR     1

/* Signals from DCE */
#define COMCTRL_CTS     2
#define COMCTRL_DCD     3
#define COMCTRL_DSR     4
#define COMCTRL_RI      5

struct ipw_control_packet_body {
        /* DTE signal or DCE signal */
        unsigned char sig_no;
        /* 0: set signal, 1: clear signal */
        unsigned char value;
} __attribute__ ((__packed__));

struct ipw_control_packet {
        struct ipw_tx_packet header;
        struct ipw_control_packet_body body;
};

struct ipw_rx_packet {
        struct list_head queue;
        unsigned int capacity;
        unsigned int length;
        unsigned int protocol;
        unsigned int channel_idx;
};

static char *data_type(const unsigned char *buf, unsigned length)
{
        struct nl_packet_header *hdr = (struct nl_packet_header *) buf;

        if (length == 0)
                return "     ";

        if (hdr->packet_rank & NL_FIRST_PACKET) {
                switch (hdr->protocol) {
                case TL_PROTOCOLID_COM_DATA:    return "DATA ";
                case TL_PROTOCOLID_COM_CTRL:    return "CTRL ";
                case TL_PROTOCOLID_SETUP:       return "SETUP";
                default: return "???? ";
                }
        } else
                return "     ";
}

#define DUMP_MAX_BYTES 64

static void dump_data_bytes(const char *type, const unsigned char *data,
                            unsigned length)
{
        char prefix[56];

        sprintf(prefix, IPWIRELESS_PCCARD_NAME ": %s %s ",
                        type, data_type(data, length));
        print_hex_dump_bytes(prefix, 0, (void *)data,
                        length < DUMP_MAX_BYTES ? length : DUMP_MAX_BYTES);
}

static void swap_packet_bitfield_to_le(unsigned char *data)
{
#ifdef __BIG_ENDIAN_BITFIELD
        unsigned char tmp = *data, ret = 0;

        /*
         * transform bits from aa.bbb.ccc to ccc.bbb.aa
         */
        ret |= (tmp & 0xc0) >> 6;
        ret |= (tmp & 0x38) >> 1;
        ret |= (tmp & 0x07) << 5;
        *data = ret & 0xff;
#endif
}

static void swap_packet_bitfield_from_le(unsigned char *data)
{
#ifdef __BIG_ENDIAN_BITFIELD
        unsigned char tmp = *data, ret = 0;

        /*
         * transform bits from ccc.bbb.aa to aa.bbb.ccc
         */
        ret |= (tmp & 0xe0) >> 5;
        ret |= (tmp & 0x1c) << 1;
        ret |= (tmp & 0x03) << 6;
        *data = ret & 0xff;
#endif
}

static void do_send_fragment(struct ipw_hardware *hw, unsigned char *data,
                            unsigned length)
{
        unsigned i;
        unsigned long flags;

        start_timing();
        BUG_ON(length > hw->ll_mtu);

        if (ipwireless_debug)
                dump_data_bytes("send", data, length);

        spin_lock_irqsave(&hw->lock, flags);

        hw->tx_ready = 0;
        swap_packet_bitfield_to_le(data);

        if (hw->hw_version == HW_VERSION_1) {
                outw((unsigned short) length, hw->base_port + IODWR);

                for (i = 0; i < length; i += 2) {
                        unsigned short d = data[i];
                        __le16 raw_data;

                        if (i + 1 < length)
                                d |= data[i + 1] << 8;
                        raw_data = cpu_to_le16(d);
                        outw(raw_data, hw->base_port + IODWR);
                }

                outw(DCR_TXDONE, hw->base_port + IODCR);
        } else if (hw->hw_version == HW_VERSION_2) {
                outw((unsigned short) length, hw->base_port);

                for (i = 0; i < length; i += 2) {
                        unsigned short d = data[i];
                        __le16 raw_data;

                        if (i + 1 < length)
                                d |= data[i + 1] << 8;
                        raw_data = cpu_to_le16(d);
                        outw(raw_data, hw->base_port);
                }
                while ((i & 3) != 2) {
                        outw((unsigned short) 0xDEAD, hw->base_port);
                        i += 2;
                }
                writew(MEMRX_RX, &hw->memory_info_regs->memreg_rx);
        }

        spin_unlock_irqrestore(&hw->lock, flags);

        end_write_timing(length);
}

static void do_send_packet(struct ipw_hardware *hw, struct ipw_tx_packet *packet)
{
        unsigned short fragment_data_len;
        unsigned short data_left = packet->length - packet->offset;
        unsigned short header_size;
        union nl_packet pkt;

        header_size =
            (packet->fragment_count == 0)
            ? NL_FIRST_PACKET_HEADER_SIZE
            : NL_FOLLOWING_PACKET_HEADER_SIZE;
        fragment_data_len = hw->ll_mtu - header_size;
        if (data_left < fragment_data_len)
                fragment_data_len = data_left;

        /*
         * hdr_first is now in machine bitfield order, which will be swapped
         * to le just before it goes to hw
         */
        pkt.hdr_first.protocol = packet->protocol;
        pkt.hdr_first.address = packet->dest_addr;
        pkt.hdr_first.packet_rank = 0;

        /* First packet? */
        if (packet->fragment_count == 0) {
                pkt.hdr_first.packet_rank |= NL_FIRST_PACKET;
                pkt.hdr_first.length_lsb = (unsigned char) packet->length;
                pkt.hdr_first.length_msb =
                        (unsigned char) (packet->length >> 8);
        }

        memcpy(pkt.rawpkt + header_size,
               ((unsigned char *) packet) + sizeof(struct ipw_tx_packet) +
               packet->offset, fragment_data_len);
        packet->offset += fragment_data_len;
        packet->fragment_count++;

        /* Last packet? (May also be first packet.) */
        if (packet->offset == packet->length)
                pkt.hdr_first.packet_rank |= NL_LAST_PACKET;
        do_send_fragment(hw, pkt.rawpkt, header_size + fragment_data_len);

        /* If this packet has unsent data, then re-queue it. */
        if (packet->offset < packet->length) {
                /*
                 * Re-queue it at the head of the highest priority queue so
                 * it goes before all other packets
                 */
                unsigned long flags;

                spin_lock_irqsave(&hw->lock, flags);
                list_add(&packet->queue, &hw->tx_queue[0]);
                hw->tx_queued++;
                spin_unlock_irqrestore(&hw->lock, flags);
        } else {
                if (packet->packet_callback)
                        packet->packet_callback(packet->callback_data,
                                        packet->length);
                kfree(packet);
        }
}

static void ipw_setup_hardware(struct ipw_hardware *hw)
{
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        if (hw->hw_version == HW_VERSION_1) {
                /* Reset RX FIFO */
                outw(DCR_RXRESET, hw->base_port + IODCR);
                /* SB: Reset TX FIFO */
                outw(DCR_TXRESET, hw->base_port + IODCR);

                /* Enable TX and RX interrupts. */
                outw(IER_TXENABLED | IER_RXENABLED, hw->base_port + IOIER);
        } else {
                /*
                 * Set INTRACK bit (bit 0), which means we must explicitly
                 * acknowledge interrupts by clearing bit 2 of reg_config_and_status.
                 */
                unsigned short csr = readw(&hw->memregs_CCR->reg_config_and_status);

                csr |= 1;
                writew(csr, &hw->memregs_CCR->reg_config_and_status);
        }
        spin_unlock_irqrestore(&hw->lock, flags);
}

/*
 * If 'packet' is NULL, then this function allocates a new packet, setting its
 * length to 0 and ensuring it has the specified minimum amount of free space.
 *
 * If 'packet' is not NULL, then this function enlarges it if it doesn't
 * have the specified minimum amount of free space.
 *
 */
static struct ipw_rx_packet *pool_allocate(struct ipw_hardware *hw,
                                           struct ipw_rx_packet *packet,
                                           int minimum_free_space)
{

        if (!packet) {
                unsigned long flags;

                spin_lock_irqsave(&hw->lock, flags);
                if (!list_empty(&hw->rx_pool)) {
                        packet = list_first_entry(&hw->rx_pool,
                                        struct ipw_rx_packet, queue);
                        hw->rx_pool_size--;
                        spin_unlock_irqrestore(&hw->lock, flags);
                        list_del(&packet->queue);
                } else {
                        const int min_capacity =
                                ipwireless_ppp_mru(hw->network) + 2;
                        int new_capacity;

                        spin_unlock_irqrestore(&hw->lock, flags);
                        new_capacity =
                                (minimum_free_space > min_capacity
                                 ? minimum_free_space
                                 : min_capacity);
                        packet = kmalloc(sizeof(struct ipw_rx_packet)
                                        + new_capacity, GFP_ATOMIC);
                        if (!packet)
                                return NULL;
                        packet->capacity = new_capacity;
                }
                packet->length = 0;
        }

        if (packet->length + minimum_free_space > packet->capacity) {
                struct ipw_rx_packet *old_packet = packet;

                packet = kmalloc(sizeof(struct ipw_rx_packet) +
                                old_packet->length + minimum_free_space,
                                GFP_ATOMIC);
                if (!packet) {
                        kfree(old_packet);
                        return NULL;
                }
                memcpy(packet, old_packet,
                                sizeof(struct ipw_rx_packet)
                                        + old_packet->length);
                packet->capacity = old_packet->length + minimum_free_space;
                kfree(old_packet);
        }

        return packet;
}

static void pool_free(struct ipw_hardware *hw, struct ipw_rx_packet *packet)
{
        if (hw->rx_pool_size > 6)
                kfree(packet);
        else {
                hw->rx_pool_size++;
                list_add(&packet->queue, &hw->rx_pool);
        }
}

static void queue_received_packet(struct ipw_hardware *hw,
                                  unsigned int protocol,
                                  unsigned int address,
                                  const unsigned char *data, int length,
                                  int is_last)
{
        unsigned int channel_idx = address - 1;
        struct ipw_rx_packet *packet = NULL;
        unsigned long flags;

        /* Discard packet if channel index is out of range. */
        if (channel_idx >= NL_NUM_OF_ADDRESSES) {
                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                       ": data packet has bad address %u\n", address);
                return;
        }

        /*
         * ->packet_assembler is safe to touch unlocked, this is the only place
         */
        if (protocol == TL_PROTOCOLID_COM_DATA) {
                struct ipw_rx_packet **assem =
                        &hw->packet_assembler[channel_idx];

                /*
                 * Create a new packet, or assembler already contains one
                 * enlarge it by 'length' bytes.
                 */
                (*assem) = pool_allocate(hw, *assem, length);
                if (!(*assem)) {
                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
                                ": no memory for incoming data packet, dropped!\n");
                        return;
                }
                (*assem)->protocol = protocol;
                (*assem)->channel_idx = channel_idx;

                /* Append this packet data onto existing data. */
                memcpy((unsigned char *)(*assem) +
                               sizeof(struct ipw_rx_packet)
                                + (*assem)->length, data, length);
                (*assem)->length += length;
                if (is_last) {
                        packet = *assem;
                        *assem = NULL;
                        /* Count queued DATA bytes only */
                        spin_lock_irqsave(&hw->lock, flags);
                        hw->rx_bytes_queued += packet->length;
                        spin_unlock_irqrestore(&hw->lock, flags);
                }
        } else {
                /* If it's a CTRL packet, don't assemble, just queue it. */
                packet = pool_allocate(hw, NULL, length);
                if (!packet) {
                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
                                ": no memory for incoming ctrl packet, dropped!\n");
                        return;
                }
                packet->protocol = protocol;
                packet->channel_idx = channel_idx;
                memcpy((unsigned char *)packet + sizeof(struct ipw_rx_packet),
                                data, length);
                packet->length = length;
        }

        /*
         * If this is the last packet, then send the assembled packet on to the
         * network layer.
         */
        if (packet) {
                spin_lock_irqsave(&hw->lock, flags);
                list_add_tail(&packet->queue, &hw->rx_queue);
                /* Block reception of incoming packets if queue is full. */
                hw->blocking_rx =
                        (hw->rx_bytes_queued >= IPWIRELESS_RX_QUEUE_SIZE);

                spin_unlock_irqrestore(&hw->lock, flags);
                schedule_work(&hw->work_rx);
        }
}

/*
 * Workqueue callback
 */
static void ipw_receive_data_work(struct work_struct *work_rx)
{
        struct ipw_hardware *hw =
            container_of(work_rx, struct ipw_hardware, work_rx);
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        while (!list_empty(&hw->rx_queue)) {
                struct ipw_rx_packet *packet =
                        list_first_entry(&hw->rx_queue,
                                        struct ipw_rx_packet, queue);

                if (hw->shutting_down)
                        break;
                list_del(&packet->queue);

                /*
                 * Note: ipwireless_network_packet_received must be called in a
                 * process context (i.e. via schedule_work) because the tty
                 * output code can sleep in the tty_flip_buffer_push call.
                 */
                if (packet->protocol == TL_PROTOCOLID_COM_DATA) {
                        if (hw->network != NULL) {
                                /* If the network hasn't been disconnected. */
                                spin_unlock_irqrestore(&hw->lock, flags);
                                /*
                                 * This must run unlocked due to tty processing
                                 * and mutex locking
                                 */
                                ipwireless_network_packet_received(
                                                hw->network,
                                                packet->channel_idx,
                                                (unsigned char *)packet
                                                + sizeof(struct ipw_rx_packet),
                                                packet->length);
                                spin_lock_irqsave(&hw->lock, flags);
                        }
                        /* Count queued DATA bytes only */
                        hw->rx_bytes_queued -= packet->length;
                } else {
                        /*
                         * This is safe to be called locked, callchain does
                         * not block
                         */
                        handle_received_CTRL_packet(hw, packet->channel_idx,
                                        (unsigned char *)packet
                                        + sizeof(struct ipw_rx_packet),
                                        packet->length);
                }
                pool_free(hw, packet);
                /*
                 * Unblock reception of incoming packets if queue is no longer
                 * full.
                 */
                hw->blocking_rx =
                        hw->rx_bytes_queued >= IPWIRELESS_RX_QUEUE_SIZE;
                if (hw->shutting_down)
                        break;
        }
        spin_unlock_irqrestore(&hw->lock, flags);
}

static void handle_received_CTRL_packet(struct ipw_hardware *hw,
                                        unsigned int channel_idx,
                                        const unsigned char *data, int len)
{
        const struct ipw_control_packet_body *body =
                (const struct ipw_control_packet_body *) data;
        unsigned int changed_mask;

        if (len != sizeof(struct ipw_control_packet_body)) {
                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                       ": control packet was %d bytes - wrong size!\n",
                       len);
                return;
        }

        switch (body->sig_no) {
        case COMCTRL_CTS:
                changed_mask = IPW_CONTROL_LINE_CTS;
                break;
        case COMCTRL_DCD:
                changed_mask = IPW_CONTROL_LINE_DCD;
                break;
        case COMCTRL_DSR:
                changed_mask = IPW_CONTROL_LINE_DSR;
                break;
        case COMCTRL_RI:
                changed_mask = IPW_CONTROL_LINE_RI;
                break;
        default:
                changed_mask = 0;
        }

        if (changed_mask != 0) {
                if (body->value)
                        hw->control_lines[channel_idx] |= changed_mask;
                else
                        hw->control_lines[channel_idx] &= ~changed_mask;
                if (hw->network)
                        ipwireless_network_notify_control_line_change(
                                        hw->network,
                                        channel_idx,
                                        hw->control_lines[channel_idx],
                                        changed_mask);
        }
}

static void handle_received_packet(struct ipw_hardware *hw,
                                   const union nl_packet *packet,
                                   unsigned short len)
{
        unsigned int protocol = packet->hdr.protocol;
        unsigned int address = packet->hdr.address;
        unsigned int header_length;
        const unsigned char *data;
        unsigned int data_len;
        int is_last = packet->hdr.packet_rank & NL_LAST_PACKET;

        if (packet->hdr.packet_rank & NL_FIRST_PACKET)
                header_length = NL_FIRST_PACKET_HEADER_SIZE;
        else
                header_length = NL_FOLLOWING_PACKET_HEADER_SIZE;

        data = packet->rawpkt + header_length;
        data_len = len - header_length;
        switch (protocol) {
        case TL_PROTOCOLID_COM_DATA:
        case TL_PROTOCOLID_COM_CTRL:
                queue_received_packet(hw, protocol, address, data, data_len,
                                is_last);
                break;
        case TL_PROTOCOLID_SETUP:
                handle_received_SETUP_packet(hw, address, data, data_len,
                                is_last);
                break;
        }
}

static void acknowledge_data_read(struct ipw_hardware *hw)
{
        if (hw->hw_version == HW_VERSION_1)
                outw(DCR_RXDONE, hw->base_port + IODCR);
        else
                writew(MEMRX_PCINTACKK,
                                &hw->memory_info_regs->memreg_pc_interrupt_ack);
}

/*
 * Retrieve a packet from the IPW hardware.
 */
static void do_receive_packet(struct ipw_hardware *hw)
{
        unsigned len;
        unsigned i;
        unsigned char pkt[LL_MTU_MAX];

        start_timing();

        if (hw->hw_version == HW_VERSION_1) {
                len = inw(hw->base_port + IODRR);
                if (len > hw->ll_mtu) {
                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                               ": received a packet of %u bytes - longer than the MTU!\n", len);
                        outw(DCR_RXDONE | DCR_RXRESET, hw->base_port + IODCR);
                        return;
                }

                for (i = 0; i < len; i += 2) {
                        __le16 raw_data = inw(hw->base_port + IODRR);
                        unsigned short data = le16_to_cpu(raw_data);

                        pkt[i] = (unsigned char) data;
                        pkt[i + 1] = (unsigned char) (data >> 8);
                }
        } else {
                len = inw(hw->base_port);
                if (len > hw->ll_mtu) {
                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                               ": received a packet of %u bytes - longer than the MTU!\n", len);
                        writew(MEMRX_PCINTACKK,
                                &hw->memory_info_regs->memreg_pc_interrupt_ack);
                        return;
                }

                for (i = 0; i < len; i += 2) {
                        __le16 raw_data = inw(hw->base_port);
                        unsigned short data = le16_to_cpu(raw_data);

                        pkt[i] = (unsigned char) data;
                        pkt[i + 1] = (unsigned char) (data >> 8);
                }

                while ((i & 3) != 2) {
                        inw(hw->base_port);
                        i += 2;
                }
        }

        acknowledge_data_read(hw);

        swap_packet_bitfield_from_le(pkt);

        if (ipwireless_debug)
                dump_data_bytes("recv", pkt, len);

        handle_received_packet(hw, (union nl_packet *) pkt, len);

        end_read_timing(len);
}

static int get_current_packet_priority(struct ipw_hardware *hw)
{
        /*
         * If we're initializing, don't send anything of higher priority than
         * PRIO_SETUP.  The network layer therefore need not care about
         * hardware initialization - any of its stuff will simply be queued
         * until setup is complete.
         */
        return (hw->to_setup || hw->initializing
                        ? PRIO_SETUP + 1 : NL_NUM_OF_PRIORITIES);
}

/*
 * return 1 if something has been received from hw
 */
static int get_packets_from_hw(struct ipw_hardware *hw)
{
        int received = 0;
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        while (hw->rx_ready && !hw->blocking_rx) {
                received = 1;
                hw->rx_ready--;
                spin_unlock_irqrestore(&hw->lock, flags);

                do_receive_packet(hw);

                spin_lock_irqsave(&hw->lock, flags);
        }
        spin_unlock_irqrestore(&hw->lock, flags);

        return received;
}

/*
 * Send pending packet up to given priority, prioritize SETUP data until
 * hardware is fully setup.
 *
 * return 1 if more packets can be sent
 */
static int send_pending_packet(struct ipw_hardware *hw, int priority_limit)
{
        int more_to_send = 0;
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        if (hw->tx_queued && hw->tx_ready) {
                int priority;
                struct ipw_tx_packet *packet = NULL;

                /* Pick a packet */
                for (priority = 0; priority < priority_limit; priority++) {
                        if (!list_empty(&hw->tx_queue[priority])) {
                                packet = list_first_entry(
                                                &hw->tx_queue[priority],
                                                struct ipw_tx_packet,
                                                queue);

                                hw->tx_queued--;
                                list_del(&packet->queue);

                                break;
                        }
                }
                if (!packet) {
                        hw->tx_queued = 0;
                        spin_unlock_irqrestore(&hw->lock, flags);
                        return 0;
                }

                spin_unlock_irqrestore(&hw->lock, flags);

                /* Send */
                do_send_packet(hw, packet);

                /* Check if more to send */
                spin_lock_irqsave(&hw->lock, flags);
                for (priority = 0; priority < priority_limit; priority++)
                        if (!list_empty(&hw->tx_queue[priority])) {
                                more_to_send = 1;
                                break;
                        }

                if (!more_to_send)
                        hw->tx_queued = 0;
        }
        spin_unlock_irqrestore(&hw->lock, flags);

        return more_to_send;
}

/*
 * Send and receive all queued packets.
 */
static void ipwireless_do_tasklet(struct tasklet_struct *t)
{
        struct ipw_hardware *hw = from_tasklet(hw, t, tasklet);
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        if (hw->shutting_down) {
                spin_unlock_irqrestore(&hw->lock, flags);
                return;
        }

        if (hw->to_setup == 1) {
                /*
                 * Initial setup data sent to hardware
                 */
                hw->to_setup = 2;
                spin_unlock_irqrestore(&hw->lock, flags);

                ipw_setup_hardware(hw);
                ipw_send_setup_packet(hw);

                send_pending_packet(hw, PRIO_SETUP + 1);
                get_packets_from_hw(hw);
        } else {
                int priority_limit = get_current_packet_priority(hw);
                int again;

                spin_unlock_irqrestore(&hw->lock, flags);

                do {
                        again = send_pending_packet(hw, priority_limit);
                        again |= get_packets_from_hw(hw);
                } while (again);
        }
}

/*
 * return true if the card is physically present.
 */
static int is_card_present(struct ipw_hardware *hw)
{
        if (hw->hw_version == HW_VERSION_1)
                return inw(hw->base_port + IOIR) != 0xFFFF;
        else
                return readl(&hw->memory_info_regs->memreg_card_present) ==
                    CARD_PRESENT_VALUE;
}

static irqreturn_t ipwireless_handle_v1_interrupt(int irq,
                                                  struct ipw_hardware *hw)
{
        unsigned short irqn;

        irqn = inw(hw->base_port + IOIR);

        /* Check if card is present */
        if (irqn == 0xFFFF)
                return IRQ_NONE;
        else if (irqn != 0) {
                unsigned short ack = 0;
                unsigned long flags;

                /* Transmit complete. */
                if (irqn & IR_TXINTR) {
                        ack |= IR_TXINTR;
                        spin_lock_irqsave(&hw->lock, flags);
                        hw->tx_ready = 1;
                        spin_unlock_irqrestore(&hw->lock, flags);
                }
                /* Received data */
                if (irqn & IR_RXINTR) {
                        ack |= IR_RXINTR;
                        spin_lock_irqsave(&hw->lock, flags);
                        hw->rx_ready++;
                        spin_unlock_irqrestore(&hw->lock, flags);
                }
                if (ack != 0) {
                        outw(ack, hw->base_port + IOIR);
                        tasklet_schedule(&hw->tasklet);
                }
                return IRQ_HANDLED;
        }
        return IRQ_NONE;
}

static void acknowledge_pcmcia_interrupt(struct ipw_hardware *hw)
{
        unsigned short csr = readw(&hw->memregs_CCR->reg_config_and_status);

        csr &= 0xfffd;
        writew(csr, &hw->memregs_CCR->reg_config_and_status);
}

static irqreturn_t ipwireless_handle_v2_v3_interrupt(int irq,
                                                     struct ipw_hardware *hw)
{
        int tx = 0;
        int rx = 0;
        int rx_repeat = 0;
        int try_mem_tx_old;
        unsigned long flags;

        do {

        unsigned short memtx = readw(hw->memreg_tx);
        unsigned short memtx_serial;
        unsigned short memrxdone =
                readw(&hw->memory_info_regs->memreg_rx_done);

        try_mem_tx_old = 0;

        /* check whether the interrupt was generated by ipwireless card */
        if (!(memtx & MEMTX_TX) && !(memrxdone & MEMRX_RX_DONE)) {

                /* check if the card uses memreg_tx_old register */
                if (hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
                        memtx = readw(&hw->memory_info_regs->memreg_tx_old);
                        if (memtx & MEMTX_TX) {
                                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                                        ": Using memreg_tx_old\n");
                                hw->memreg_tx =
                                        &hw->memory_info_regs->memreg_tx_old;
                        } else {
                                return IRQ_NONE;
                        }
                } else
                        return IRQ_NONE;
        }

        /*
         * See if the card is physically present. Note that while it is
         * powering up, it appears not to be present.
         */
        if (!is_card_present(hw)) {
                acknowledge_pcmcia_interrupt(hw);
                return IRQ_HANDLED;
        }

        memtx_serial = memtx & (unsigned short) 0xff00;
        if (memtx & MEMTX_TX) {
                writew(memtx_serial, hw->memreg_tx);

                if (hw->serial_number_detected) {
                        if (memtx_serial != hw->last_memtx_serial) {
                                hw->last_memtx_serial = memtx_serial;
                                spin_lock_irqsave(&hw->lock, flags);
                                hw->rx_ready++;
                                spin_unlock_irqrestore(&hw->lock, flags);
                                rx = 1;
                        } else
                                /* Ignore 'Timer Recovery' duplicates. */
                                rx_repeat = 1;
                } else {
                        /*
                         * If a non-zero serial number is seen, then enable
                         * serial number checking.
                         */
                        if (memtx_serial != 0) {
                                hw->serial_number_detected = 1;
                                printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
                                        ": memreg_tx serial num detected\n");

                                spin_lock_irqsave(&hw->lock, flags);
                                hw->rx_ready++;
                                spin_unlock_irqrestore(&hw->lock, flags);
                        }
                        rx = 1;
                }
        }
        if (memrxdone & MEMRX_RX_DONE) {
                writew(0, &hw->memory_info_regs->memreg_rx_done);
                spin_lock_irqsave(&hw->lock, flags);
                hw->tx_ready = 1;
                spin_unlock_irqrestore(&hw->lock, flags);
                tx = 1;
        }
        if (tx)
                writew(MEMRX_PCINTACKK,
                                &hw->memory_info_regs->memreg_pc_interrupt_ack);

        acknowledge_pcmcia_interrupt(hw);

        if (tx || rx)
                tasklet_schedule(&hw->tasklet);
        else if (!rx_repeat) {
                if (hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
                        if (hw->serial_number_detected)
                                printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
                                        ": spurious interrupt - new_tx mode\n");
                        else {
                                printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
                                        ": no valid memreg_tx value - switching to the old memreg_tx\n");
                                hw->memreg_tx =
                                        &hw->memory_info_regs->memreg_tx_old;
                                try_mem_tx_old = 1;
                        }
                } else
                        printk(KERN_WARNING IPWIRELESS_PCCARD_NAME
                                        ": spurious interrupt - old_tx mode\n");
        }

        } while (try_mem_tx_old == 1);

        return IRQ_HANDLED;
}

irqreturn_t ipwireless_interrupt(int irq, void *dev_id)
{
        struct ipw_dev *ipw = dev_id;

        if (ipw->hardware->hw_version == HW_VERSION_1)
                return ipwireless_handle_v1_interrupt(irq, ipw->hardware);
        else
                return ipwireless_handle_v2_v3_interrupt(irq, ipw->hardware);
}

static void flush_packets_to_hw(struct ipw_hardware *hw)
{
        int priority_limit;
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        priority_limit = get_current_packet_priority(hw);
        spin_unlock_irqrestore(&hw->lock, flags);

        while (send_pending_packet(hw, priority_limit));
}

static void send_packet(struct ipw_hardware *hw, int priority,
                        struct ipw_tx_packet *packet)
{
        unsigned long flags;

        spin_lock_irqsave(&hw->lock, flags);
        list_add_tail(&packet->queue, &hw->tx_queue[priority]);
        hw->tx_queued++;
        spin_unlock_irqrestore(&hw->lock, flags);

        flush_packets_to_hw(hw);
}

/* Create data packet, non-atomic allocation */
static void *alloc_data_packet(int data_size,
                                unsigned char dest_addr,
                                unsigned char protocol)
{
        struct ipw_tx_packet *packet = kzalloc(
                        sizeof(struct ipw_tx_packet) + data_size,
                        GFP_ATOMIC);

        if (!packet)
                return NULL;

        INIT_LIST_HEAD(&packet->queue);
        packet->dest_addr = dest_addr;
        packet->protocol = protocol;
        packet->length = data_size;

        return packet;
}

static void *alloc_ctrl_packet(int header_size,
                               unsigned char dest_addr,
                               unsigned char protocol,
                               unsigned char sig_no)
{
        /*
         * sig_no is located right after ipw_tx_packet struct in every
         * CTRL or SETUP packets, we can use ipw_control_packet as a
         * common struct
         */
        struct ipw_control_packet *packet = kzalloc(header_size, GFP_ATOMIC);

        if (!packet)
                return NULL;

        INIT_LIST_HEAD(&packet->header.queue);
        packet->header.dest_addr = dest_addr;
        packet->header.protocol = protocol;
        packet->header.length = header_size - sizeof(struct ipw_tx_packet);
        packet->body.sig_no = sig_no;

        return packet;
}

int ipwireless_send_packet(struct ipw_hardware *hw, unsigned int channel_idx,
                            const u8 *data, unsigned int length,
                            void (*callback) (void *cb, unsigned int length),
                            void *callback_data)
{
        struct ipw_tx_packet *packet;

        packet = alloc_data_packet(length, (channel_idx + 1),
                        TL_PROTOCOLID_COM_DATA);
        if (!packet)
                return -ENOMEM;
        packet->packet_callback = callback;
        packet->callback_data = callback_data;
        memcpy((unsigned char *) packet + sizeof(struct ipw_tx_packet), data,
                        length);

        send_packet(hw, PRIO_DATA, packet);
        return 0;
}

static int set_control_line(struct ipw_hardware *hw, int prio,
                           unsigned int channel_idx, int line, int state)
{
        struct ipw_control_packet *packet;
        int protocolid = TL_PROTOCOLID_COM_CTRL;

        if (prio == PRIO_SETUP)
                protocolid = TL_PROTOCOLID_SETUP;

        packet = alloc_ctrl_packet(sizeof(struct ipw_control_packet),
                        (channel_idx + 1), protocolid, line);
        if (!packet)
                return -ENOMEM;
        packet->header.length = sizeof(struct ipw_control_packet_body);
        packet->body.value = (state == 0 ? 0 : 1);
        send_packet(hw, prio, &packet->header);
        return 0;
}


static int set_DTR(struct ipw_hardware *hw, int priority,
                   unsigned int channel_idx, int state)
{
        if (state != 0)
                hw->control_lines[channel_idx] |= IPW_CONTROL_LINE_DTR;
        else
                hw->control_lines[channel_idx] &= ~IPW_CONTROL_LINE_DTR;

        return set_control_line(hw, priority, channel_idx, COMCTRL_DTR, state);
}

static int set_RTS(struct ipw_hardware *hw, int priority,
                   unsigned int channel_idx, int state)
{
        if (state != 0)
                hw->control_lines[channel_idx] |= IPW_CONTROL_LINE_RTS;
        else
                hw->control_lines[channel_idx] &= ~IPW_CONTROL_LINE_RTS;

        return set_control_line(hw, priority, channel_idx, COMCTRL_RTS, state);
}

int ipwireless_set_DTR(struct ipw_hardware *hw, unsigned int channel_idx,
                       int state)
{
        return set_DTR(hw, PRIO_CTRL, channel_idx, state);
}

int ipwireless_set_RTS(struct ipw_hardware *hw, unsigned int channel_idx,
                       int state)
{
        return set_RTS(hw, PRIO_CTRL, channel_idx, state);
}

struct ipw_setup_get_version_query_packet {
        struct ipw_tx_packet header;
        struct tl_setup_get_version_qry body;
};

struct ipw_setup_config_packet {
        struct ipw_tx_packet header;
        struct tl_setup_config_msg body;
};

struct ipw_setup_config_done_packet {
        struct ipw_tx_packet header;
        struct tl_setup_config_done_msg body;
};

struct ipw_setup_open_packet {
        struct ipw_tx_packet header;
        struct tl_setup_open_msg body;
};

struct ipw_setup_info_packet {
        struct ipw_tx_packet header;
        struct tl_setup_info_msg body;
};

struct ipw_setup_reboot_msg_ack {
        struct ipw_tx_packet header;
        struct TlSetupRebootMsgAck body;
};

/* This handles the actual initialization of the card */
static void __handle_setup_get_version_rsp(struct ipw_hardware *hw)
{
        struct ipw_setup_config_packet *config_packet;
        struct ipw_setup_config_done_packet *config_done_packet;
        struct ipw_setup_open_packet *open_packet;
        struct ipw_setup_info_packet *info_packet;
        int port;
        unsigned int channel_idx;

        /* generate config packet */
        for (port = 1; port <= NL_NUM_OF_ADDRESSES; port++) {
                config_packet = alloc_ctrl_packet(
                                sizeof(struct ipw_setup_config_packet),
                                ADDR_SETUP_PROT,
                                TL_PROTOCOLID_SETUP,
                                TL_SETUP_SIGNO_CONFIG_MSG);
                if (!config_packet)
                        goto exit_nomem;
                config_packet->header.length = sizeof(struct tl_setup_config_msg);
                config_packet->body.port_no = port;
                config_packet->body.prio_data = PRIO_DATA;
                config_packet->body.prio_ctrl = PRIO_CTRL;
                send_packet(hw, PRIO_SETUP, &config_packet->header);
        }
        config_done_packet = alloc_ctrl_packet(
                        sizeof(struct ipw_setup_config_done_packet),
                        ADDR_SETUP_PROT,
                        TL_PROTOCOLID_SETUP,
                        TL_SETUP_SIGNO_CONFIG_DONE_MSG);
        if (!config_done_packet)
                goto exit_nomem;
        config_done_packet->header.length = sizeof(struct tl_setup_config_done_msg);
        send_packet(hw, PRIO_SETUP, &config_done_packet->header);

        /* generate open packet */
        for (port = 1; port <= NL_NUM_OF_ADDRESSES; port++) {
                open_packet = alloc_ctrl_packet(
                                sizeof(struct ipw_setup_open_packet),
                                ADDR_SETUP_PROT,
                                TL_PROTOCOLID_SETUP,
                                TL_SETUP_SIGNO_OPEN_MSG);
                if (!open_packet)
                        goto exit_nomem;
                open_packet->header.length = sizeof(struct tl_setup_open_msg);
                open_packet->body.port_no = port;
                send_packet(hw, PRIO_SETUP, &open_packet->header);
        }
        for (channel_idx = 0;
                        channel_idx < NL_NUM_OF_ADDRESSES; channel_idx++) {
                int ret;

                ret = set_DTR(hw, PRIO_SETUP, channel_idx,
                        (hw->control_lines[channel_idx] &
                         IPW_CONTROL_LINE_DTR) != 0);
                if (ret) {
                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
                                        ": error setting DTR (%d)\n", ret);
                        return;
                }

                ret = set_RTS(hw, PRIO_SETUP, channel_idx,
                        (hw->control_lines [channel_idx] &
                         IPW_CONTROL_LINE_RTS) != 0);
                if (ret) {
                        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
                                        ": error setting RTS (%d)\n", ret);
                        return;
                }
        }
        /*
         * For NDIS we assume that we are using sync PPP frames, for COM async.
         * This driver uses NDIS mode too. We don't bother with translation
         * from async -> sync PPP.
         */
        info_packet = alloc_ctrl_packet(sizeof(struct ipw_setup_info_packet),
                        ADDR_SETUP_PROT,
                        TL_PROTOCOLID_SETUP,
                        TL_SETUP_SIGNO_INFO_MSG);
        if (!info_packet)
                goto exit_nomem;
        info_packet->header.length = sizeof(struct tl_setup_info_msg);
        info_packet->body.driver_type = NDISWAN_DRIVER;
        info_packet->body.major_version = NDISWAN_DRIVER_MAJOR_VERSION;
        info_packet->body.minor_version = NDISWAN_DRIVER_MINOR_VERSION;
        send_packet(hw, PRIO_SETUP, &info_packet->header);

        /* Initialization is now complete, so we clear the 'to_setup' flag */
        hw->to_setup = 0;

        return;

exit_nomem:
        printk(KERN_ERR IPWIRELESS_PCCARD_NAME
                        ": not enough memory to alloc control packet\n");
        hw->to_setup = -1;
}

static void handle_setup_get_version_rsp(struct ipw_hardware *hw,
                unsigned char vers_no)
{
        timer_delete(&hw->setup_timer);
        hw->initializing = 0;
        printk(KERN_INFO IPWIRELESS_PCCARD_NAME ": card is ready.\n");

        if (vers_no == TL_SETUP_VERSION)
                __handle_setup_get_version_rsp(hw);
        else
                printk(KERN_ERR IPWIRELESS_PCCARD_NAME
                                ": invalid hardware version no %u\n",
                                (unsigned int) vers_no);
}

static void ipw_send_setup_packet(struct ipw_hardware *hw)
{
        struct ipw_setup_get_version_query_packet *ver_packet;

        ver_packet = alloc_ctrl_packet(
                        sizeof(struct ipw_setup_get_version_query_packet),
                        ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
                        TL_SETUP_SIGNO_GET_VERSION_QRY);
        if (!ver_packet)
                return;
        ver_packet->header.length = sizeof(struct tl_setup_get_version_qry);

        /*
         * Response is handled in handle_received_SETUP_packet
         */
        send_packet(hw, PRIO_SETUP, &ver_packet->header);
}

static void handle_received_SETUP_packet(struct ipw_hardware *hw,
                                         unsigned int address,
                                         const unsigned char *data, int len,
                                         int is_last)
{
        const union ipw_setup_rx_msg *rx_msg = (const union ipw_setup_rx_msg *) data;

        if (address != ADDR_SETUP_PROT) {
                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                       ": setup packet has bad address %d\n", address);
                return;
        }

        switch (rx_msg->sig_no) {
        case TL_SETUP_SIGNO_GET_VERSION_RSP:
                if (hw->to_setup)
                        handle_setup_get_version_rsp(hw,
                                        rx_msg->version_rsp_msg.version);
                break;

        case TL_SETUP_SIGNO_OPEN_MSG:
                if (ipwireless_debug) {
                        unsigned int channel_idx = rx_msg->open_msg.port_no - 1;

                        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                               ": OPEN_MSG [channel %u] reply received\n",
                               channel_idx);
                }
                break;

        case TL_SETUP_SIGNO_INFO_MSG_ACK:
                if (ipwireless_debug)
                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
                               ": card successfully configured as NDISWAN\n");
                break;

        case TL_SETUP_SIGNO_REBOOT_MSG:
                if (hw->to_setup)
                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
                               ": Setup not completed - ignoring reboot msg\n");
                else {
                        struct ipw_setup_reboot_msg_ack *packet;

                        printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
                               ": Acknowledging REBOOT message\n");
                        packet = alloc_ctrl_packet(
                                        sizeof(struct ipw_setup_reboot_msg_ack),
                                        ADDR_SETUP_PROT, TL_PROTOCOLID_SETUP,
                                        TL_SETUP_SIGNO_REBOOT_MSG_ACK);
                        if (!packet) {
                                pr_err(IPWIRELESS_PCCARD_NAME
                                       ": Not enough memory to send reboot packet");
                                break;
                        }
                        packet->header.length =
                                sizeof(struct TlSetupRebootMsgAck);
                        send_packet(hw, PRIO_SETUP, &packet->header);
                        if (hw->reboot_callback)
                                hw->reboot_callback(hw->reboot_callback_data);
                }
                break;

        default:
                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                       ": unknown setup message %u received\n",
                       (unsigned int) rx_msg->sig_no);
        }
}

static void do_close_hardware(struct ipw_hardware *hw)
{
        unsigned int irqn;

        if (hw->hw_version == HW_VERSION_1) {
                /* Disable TX and RX interrupts. */
                outw(0, hw->base_port + IOIER);

                /* Acknowledge any outstanding interrupt requests */
                irqn = inw(hw->base_port + IOIR);
                if (irqn & IR_TXINTR)
                        outw(IR_TXINTR, hw->base_port + IOIR);
                if (irqn & IR_RXINTR)
                        outw(IR_RXINTR, hw->base_port + IOIR);

                synchronize_irq(hw->irq);
        }
}

struct ipw_hardware *ipwireless_hardware_create(void)
{
        int i;
        struct ipw_hardware *hw =
                kzalloc_obj(struct ipw_hardware);

        if (!hw)
                return NULL;

        hw->irq = -1;
        hw->initializing = 1;
        hw->tx_ready = 1;
        hw->rx_bytes_queued = 0;
        hw->rx_pool_size = 0;
        hw->last_memtx_serial = (unsigned short) 0xffff;
        for (i = 0; i < NL_NUM_OF_PRIORITIES; i++)
                INIT_LIST_HEAD(&hw->tx_queue[i]);

        INIT_LIST_HEAD(&hw->rx_queue);
        INIT_LIST_HEAD(&hw->rx_pool);
        spin_lock_init(&hw->lock);
        tasklet_setup(&hw->tasklet, ipwireless_do_tasklet);
        INIT_WORK(&hw->work_rx, ipw_receive_data_work);
        timer_setup(&hw->setup_timer, ipwireless_setup_timer, 0);

        return hw;
}

void ipwireless_init_hardware_v1(struct ipw_hardware *hw,
                unsigned int base_port,
                void __iomem *attr_memory,
                void __iomem *common_memory,
                int is_v2_card,
                void (*reboot_callback) (void *data),
                void *reboot_callback_data)
{
        if (hw->removed) {
                hw->removed = 0;
                enable_irq(hw->irq);
        }
        hw->base_port = base_port;
        hw->hw_version = (is_v2_card ? HW_VERSION_2 : HW_VERSION_1);
        hw->ll_mtu = (hw->hw_version == HW_VERSION_1 ? LL_MTU_V1 : LL_MTU_V2);
        hw->memregs_CCR = (struct MEMCCR __iomem *)
                        ((unsigned short __iomem *) attr_memory + 0x200);
        hw->memory_info_regs = (struct MEMINFREG __iomem *) common_memory;
        hw->memreg_tx = &hw->memory_info_regs->memreg_tx_new;
        hw->reboot_callback = reboot_callback;
        hw->reboot_callback_data = reboot_callback_data;
}

void ipwireless_init_hardware_v2_v3(struct ipw_hardware *hw)
{
        hw->initializing = 1;
        hw->init_loops = 0;
        printk(KERN_INFO IPWIRELESS_PCCARD_NAME
               ": waiting for card to start up...\n");
        ipwireless_setup_timer(&hw->setup_timer);
}

static void ipwireless_setup_timer(struct timer_list *t)
{
        struct ipw_hardware *hw = timer_container_of(hw, t, setup_timer);

        hw->init_loops++;

        if (hw->init_loops == TL_SETUP_MAX_VERSION_QRY &&
                        hw->hw_version == HW_VERSION_2 &&
                        hw->memreg_tx == &hw->memory_info_regs->memreg_tx_new) {
                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                                ": failed to startup using TX2, trying TX\n");

                hw->memreg_tx = &hw->memory_info_regs->memreg_tx_old;
                hw->init_loops = 0;
        }
        /* Give up after a certain number of retries */
        if (hw->init_loops == TL_SETUP_MAX_VERSION_QRY) {
                printk(KERN_INFO IPWIRELESS_PCCARD_NAME
                       ": card failed to start up!\n");
                hw->initializing = 0;
        } else {
                /* Do not attempt to write to the board if it is not present. */
                if (is_card_present(hw)) {
                        unsigned long flags;

                        spin_lock_irqsave(&hw->lock, flags);
                        hw->to_setup = 1;
                        hw->tx_ready = 1;
                        spin_unlock_irqrestore(&hw->lock, flags);
                        tasklet_schedule(&hw->tasklet);
                }

                mod_timer(&hw->setup_timer,
                        jiffies + msecs_to_jiffies(TL_SETUP_VERSION_QRY_TMO));
        }
}

/*
 * Stop any interrupts from executing so that, once this function returns,
 * other layers of the driver can be sure they won't get any more callbacks.
 * Thus must be called on a proper process context.
 */
void ipwireless_stop_interrupts(struct ipw_hardware *hw)
{
        if (!hw->shutting_down) {
                /* Tell everyone we are going down. */
                hw->shutting_down = 1;
                timer_delete(&hw->setup_timer);

                /* Prevent the hardware from sending any more interrupts */
                do_close_hardware(hw);
        }
}

void ipwireless_hardware_free(struct ipw_hardware *hw)
{
        int i;
        struct ipw_rx_packet *rp, *rq;
        struct ipw_tx_packet *tp, *tq;

        ipwireless_stop_interrupts(hw);

        flush_work(&hw->work_rx);

        for (i = 0; i < NL_NUM_OF_ADDRESSES; i++)
                kfree(hw->packet_assembler[i]);

        for (i = 0; i < NL_NUM_OF_PRIORITIES; i++)
                list_for_each_entry_safe(tp, tq, &hw->tx_queue[i], queue) {
                        list_del(&tp->queue);
                        kfree(tp);
                }

        list_for_each_entry_safe(rp, rq, &hw->rx_queue, queue) {
                list_del(&rp->queue);
                kfree(rp);
        }

        list_for_each_entry_safe(rp, rq, &hw->rx_pool, queue) {
                list_del(&rp->queue);
                kfree(rp);
        }
        kfree(hw);
}

/*
 * Associate the specified network with this hardware, so it will receive events
 * from it.
 */
void ipwireless_associate_network(struct ipw_hardware *hw,
                                  struct ipw_network *network)
{
        hw->network = network;
}