solos-pci.c

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/*
 * Driver for the Solos PCI ADSL2+ card, designed to support Linux by
 *  Traverse Technologies -- http://www.traverse.com.au/
 *  Xrio Limited          -- http://www.xrio.com/
 *
 *
 * Copyright © 2008 Traverse Technologies
 * Copyright © 2008 Intel Corporation
 *
 * Authors: Nathan Williams <[email protected]>
 *          David Woodhouse <[email protected]>
 *          Treker Chen <[email protected]>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2, as published by the Free Software Foundation.
 *
 * 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.
 */

#define DEBUG
#define VERBOSE_DEBUG

#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/atm.h>
#include <linux/atmdev.h>
#include <linux/skbuff.h>
#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/kobject.h>
#include <linux/firmware.h>
#include <linux/ctype.h>
#include <linux/swab.h>
#include <linux/slab.h>

#define VERSION "0.07"
#define PTAG "solos-pci"

#define CONFIG_RAM_SIZE 128
#define FLAGS_ADDR  0x7C
#define IRQ_EN_ADDR 0x78
#define FPGA_VER    0x74
#define IRQ_CLEAR   0x70
#define WRITE_FLASH 0x6C
#define PORTS       0x68
#define FLASH_BLOCK 0x64
#define FLASH_BUSY  0x60
#define FPGA_MODE   0x5C
#define FLASH_MODE  0x58
#define TX_DMA_ADDR(port)   (0x40 + (4 * (port)))
#define RX_DMA_ADDR(port)   (0x30 + (4 * (port)))

#define DATA_RAM_SIZE   32768
#define BUF_SIZE    2048
#define OLD_BUF_SIZE    4096 /* For FPGA versions <= 2*/
#define FPGA_PAGE   528 /* FPGA flash page size*/
#define SOLOS_PAGE  512 /* Solos flash page size*/
#define FPGA_BLOCK  (FPGA_PAGE * 8) /* FPGA flash block size*/
#define SOLOS_BLOCK (SOLOS_PAGE * 8) /* Solos flash block size*/

#define RX_BUF(card, nr) ((card->buffers) + (nr)*(card->buffer_size)*2)
#define TX_BUF(card, nr) ((card->buffers) + (nr)*(card->buffer_size)*2 + (card->buffer_size))
#define FLASH_BUF ((card->buffers) + 4*(card->buffer_size)*2)

#define RX_DMA_SIZE 2048

#define FPGA_VERSION(a,b) (((a) << 8) + (b))
#define LEGACY_BUFFERS  2
#define DMA_SUPPORTED   4

static int reset = 0;
static int atmdebug = 0;
static int firmware_upgrade = 0;
static int fpga_upgrade = 0;
static int db_firmware_upgrade = 0;
static int db_fpga_upgrade = 0;

struct pkt_hdr {
    __le16 size;
    __le16 vpi;
    __le16 vci;
    __le16 type;
};

struct solos_skb_cb {
    struct atm_vcc *vcc;
    uint32_t dma_addr;
};


#define SKB_CB(skb)     ((struct solos_skb_cb *)skb->cb)

#define PKT_DATA    0
#define PKT_COMMAND 1
#define PKT_POPEN   3
#define PKT_PCLOSE  4
#define PKT_STATUS  5

struct solos_card {
    void __iomem *config_regs;
    void __iomem *buffers;
    int nr_ports;
    int tx_mask;
    struct pci_dev *dev;
    struct atm_dev *atmdev[4];
    struct tasklet_struct tlet;
    spinlock_t tx_lock;
    spinlock_t tx_queue_lock;
    spinlock_t cli_queue_lock;
    spinlock_t param_queue_lock;
    struct list_head param_queue;
    struct sk_buff_head tx_queue[4];
    struct sk_buff_head cli_queue[4];
    struct sk_buff *tx_skb[4];
    struct sk_buff *rx_skb[4];
    wait_queue_head_t param_wq;
    wait_queue_head_t fw_wq;
    int using_dma;
    int fpga_version;
    int buffer_size;
};


struct solos_param {
    struct list_head list;
    pid_t pid;
    int port;
    struct sk_buff *response;
};

#define SOLOS_CHAN(atmdev) ((int)(unsigned long)(atmdev)->phy_data)

MODULE_AUTHOR("Traverse Technologies <[email protected]>");
MODULE_DESCRIPTION("Solos PCI driver");
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("solos-FPGA.bin");
MODULE_FIRMWARE("solos-Firmware.bin");
MODULE_FIRMWARE("solos-db-FPGA.bin");
MODULE_PARM_DESC(reset, "Reset Solos chips on startup");
MODULE_PARM_DESC(atmdebug, "Print ATM data");
MODULE_PARM_DESC(firmware_upgrade, "Initiate Solos firmware upgrade");
MODULE_PARM_DESC(fpga_upgrade, "Initiate FPGA upgrade");
MODULE_PARM_DESC(db_firmware_upgrade, "Initiate daughter board Solos firmware upgrade");
MODULE_PARM_DESC(db_fpga_upgrade, "Initiate daughter board FPGA upgrade");
module_param(reset, int, 0444);
module_param(atmdebug, int, 0644);
module_param(firmware_upgrade, int, 0444);
module_param(fpga_upgrade, int, 0444);
module_param(db_firmware_upgrade, int, 0444);
module_param(db_fpga_upgrade, int, 0444);

static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
               struct atm_vcc *vcc);
static uint32_t fpga_tx(struct solos_card *);
static irqreturn_t solos_irq(int irq, void *dev_id);
static struct atm_vcc* find_vcc(struct atm_dev *dev, short vpi, int vci);
static int list_vccs(int vci);
static int atm_init(struct solos_card *, struct device *);
static void atm_remove(struct solos_card *);
static int send_command(struct solos_card *card, int dev, const char *buf, size_t size);
static void solos_bh(unsigned long);
static int print_buffer(struct sk_buff *buf);

static inline void solos_pop(struct atm_vcc *vcc, struct sk_buff *skb)
{
        if (vcc->pop)
                vcc->pop(vcc, skb);
        else
                dev_kfree_skb_any(skb);
}

static ssize_t solos_param_show(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    struct atm_dev *atmdev = container_of(dev, struct atm_dev, class_dev);
    struct solos_card *card = atmdev->dev_data;
    struct solos_param prm;
    struct sk_buff *skb;
    struct pkt_hdr *header;
    int buflen;

    buflen = strlen(attr->attr.name) + 10;

    skb = alloc_skb(sizeof(*header) + buflen, GFP_KERNEL);
    if (!skb) {
        dev_warn(&card->dev->dev, "Failed to allocate sk_buff in solos_param_show()\n");
        return -ENOMEM;
    }

    header = (void *)skb_put(skb, sizeof(*header));

    buflen = snprintf((void *)&header[1], buflen - 1,
              "L%05d\n%s\n", current->pid, attr->attr.name);
    skb_put(skb, buflen);

    header->size = cpu_to_le16(buflen);
    header->vpi = cpu_to_le16(0);
    header->vci = cpu_to_le16(0);
    header->type = cpu_to_le16(PKT_COMMAND);

    prm.pid = current->pid;
    prm.response = NULL;
    prm.port = SOLOS_CHAN(atmdev);

    spin_lock_irq(&card->param_queue_lock);
    list_add(&prm.list, &card->param_queue);
    spin_unlock_irq(&card->param_queue_lock);

    fpga_queue(card, prm.port, skb, NULL);

    wait_event_timeout(card->param_wq, prm.response, 5 * HZ);

    spin_lock_irq(&card->param_queue_lock);
    list_del(&prm.list);
    spin_unlock_irq(&card->param_queue_lock);

    if (!prm.response)
        return -EIO;

    buflen = prm.response->len;
    memcpy(buf, prm.response->data, buflen);
    kfree_skb(prm.response);

    return buflen;
}

static ssize_t solos_param_store(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
{
    struct atm_dev *atmdev = container_of(dev, struct atm_dev, class_dev);
    struct solos_card *card = atmdev->dev_data;
    struct solos_param prm;
    struct sk_buff *skb;
    struct pkt_hdr *header;
    int buflen;
    ssize_t ret;

    buflen = strlen(attr->attr.name) + 11 + count;

    skb = alloc_skb(sizeof(*header) + buflen, GFP_KERNEL);
    if (!skb) {
        dev_warn(&card->dev->dev, "Failed to allocate sk_buff in solos_param_store()\n");
        return -ENOMEM;
    }

    header = (void *)skb_put(skb, sizeof(*header));

    buflen = snprintf((void *)&header[1], buflen - 1,
              "L%05d\n%s\n%s\n", current->pid, attr->attr.name, buf);

    skb_put(skb, buflen);
    header->size = cpu_to_le16(buflen);
    header->vpi = cpu_to_le16(0);
    header->vci = cpu_to_le16(0);
    header->type = cpu_to_le16(PKT_COMMAND);

    prm.pid = current->pid;
    prm.response = NULL;
    prm.port = SOLOS_CHAN(atmdev);

    spin_lock_irq(&card->param_queue_lock);
    list_add(&prm.list, &card->param_queue);
    spin_unlock_irq(&card->param_queue_lock);

    fpga_queue(card, prm.port, skb, NULL);

    wait_event_timeout(card->param_wq, prm.response, 5 * HZ);

    spin_lock_irq(&card->param_queue_lock);
    list_del(&prm.list);
    spin_unlock_irq(&card->param_queue_lock);

    skb = prm.response;

    if (!skb)
        return -EIO;

    buflen = skb->len;

    /* Sometimes it has a newline, sometimes it doesn't. */
    if (skb->data[buflen - 1] == '\n')
        buflen--;

    if (buflen == 2 && !strncmp(skb->data, "OK", 2))
        ret = count;
    else if (buflen == 5 && !strncmp(skb->data, "ERROR", 5))
        ret = -EIO;
    else {
        /* We know we have enough space allocated for this; we allocated 
           it ourselves */
        skb->data[buflen] = 0;
    
        dev_warn(&card->dev->dev, "Unexpected parameter response: '%s'\n",
             skb->data);
        ret = -EIO;
    }
    kfree_skb(skb);

    return ret;
}

static char *next_string(struct sk_buff *skb)
{
    int i = 0;
    char *this = skb->data;
    
    for (i = 0; i < skb->len; i++) {
        if (this[i] == '\n') {
            this[i] = 0;
            skb_pull(skb, i + 1);
            return this;
        }
        if (!isprint(this[i]))
            return NULL;
    }
    return NULL;
}

/*
 * Status packet has fields separated by \n, starting with a version number
 * for the information therein. Fields are....
 *
 *     packet version
 *     RxBitRate    (version >= 1)
 *     TxBitRate    (version >= 1)
 *     State        (version >= 1)
 *     LocalSNRMargin   (version >= 1)
 *     LocalLineAttn    (version >= 1)
 */       
static int process_status(struct solos_card *card, int port, struct sk_buff *skb)
{
    char *str, *end, *state_str, *snr, *attn;
    int ver, rate_up, rate_down;

    if (!card->atmdev[port])
        return -ENODEV;

    str = next_string(skb);
    if (!str)
        return -EIO;

    ver = simple_strtol(str, NULL, 10);
    if (ver < 1) {
        dev_warn(&card->dev->dev, "Unexpected status interrupt version %d\n",
             ver);
        return -EIO;
    }

    str = next_string(skb);
    if (!str)
        return -EIO;
    if (!strcmp(str, "ERROR")) {
        dev_dbg(&card->dev->dev, "Status packet indicated Solos error on port %d (starting up?)\n",
             port);
        return 0;
    }

    rate_down = simple_strtol(str, &end, 10);
    if (*end)
        return -EIO;

    str = next_string(skb);
    if (!str)
        return -EIO;
    rate_up = simple_strtol(str, &end, 10);
    if (*end)
        return -EIO;

    state_str = next_string(skb);
    if (!state_str)
        return -EIO;

    /* Anything but 'Showtime' is down */
    if (strcmp(state_str, "Showtime")) {
        atm_dev_signal_change(card->atmdev[port], ATM_PHY_SIG_LOST);
        dev_info(&card->dev->dev, "Port %d: %s\n", port, state_str);
        return 0;
    }

    snr = next_string(skb);
    if (!snr)
        return -EIO;
    attn = next_string(skb);
    if (!attn)
        return -EIO;

    dev_info(&card->dev->dev, "Port %d: %s @%d/%d kb/s%s%s%s%s\n",
         port, state_str, rate_down/1000, rate_up/1000,
         snr[0]?", SNR ":"", snr, attn[0]?", Attn ":"", attn);
    
    card->atmdev[port]->link_rate = rate_down / 424;
    atm_dev_signal_change(card->atmdev[port], ATM_PHY_SIG_FOUND);

    return 0;
}

static int process_command(struct solos_card *card, int port, struct sk_buff *skb)
{
    struct solos_param *prm;
    unsigned long flags;
    int cmdpid;
    int found = 0;

    if (skb->len < 7)
        return 0;

    if (skb->data[0] != 'L'    || !isdigit(skb->data[1]) ||
        !isdigit(skb->data[2]) || !isdigit(skb->data[3]) ||
        !isdigit(skb->data[4]) || !isdigit(skb->data[5]) ||
        skb->data[6] != '\n')
        return 0;

    cmdpid = simple_strtol(&skb->data[1], NULL, 10);

    spin_lock_irqsave(&card->param_queue_lock, flags);
    list_for_each_entry(prm, &card->param_queue, list) {
        if (prm->port == port && prm->pid == cmdpid) {
            prm->response = skb;
            skb_pull(skb, 7);
            wake_up(&card->param_wq);
            found = 1;
            break;
        }
    }
    spin_unlock_irqrestore(&card->param_queue_lock, flags);
    return found;
}

static ssize_t console_show(struct device *dev, struct device_attribute *attr,
                char *buf)
{
    struct atm_dev *atmdev = container_of(dev, struct atm_dev, class_dev);
    struct solos_card *card = atmdev->dev_data;
    struct sk_buff *skb;
    unsigned int len;

    spin_lock(&card->cli_queue_lock);
    skb = skb_dequeue(&card->cli_queue[SOLOS_CHAN(atmdev)]);
    spin_unlock(&card->cli_queue_lock);
    if(skb == NULL)
        return sprintf(buf, "No data.\n");

    len = skb->len;
    memcpy(buf, skb->data, len);
    dev_dbg(&card->dev->dev, "len: %d\n", len);

    kfree_skb(skb);
    return len;
}

static int send_command(struct solos_card *card, int dev, const char *buf, size_t size)
{
    struct sk_buff *skb;
    struct pkt_hdr *header;

    if (size > (BUF_SIZE - sizeof(*header))) {
        dev_dbg(&card->dev->dev, "Command is too big.  Dropping request\n");
        return 0;
    }
    skb = alloc_skb(size + sizeof(*header), GFP_ATOMIC);
    if (!skb) {
        dev_warn(&card->dev->dev, "Failed to allocate sk_buff in send_command()\n");
        return 0;
    }

    header = (void *)skb_put(skb, sizeof(*header));

    header->size = cpu_to_le16(size);
    header->vpi = cpu_to_le16(0);
    header->vci = cpu_to_le16(0);
    header->type = cpu_to_le16(PKT_COMMAND);

    memcpy(skb_put(skb, size), buf, size);

    fpga_queue(card, dev, skb, NULL);

    return 0;
}

static ssize_t console_store(struct device *dev, struct device_attribute *attr,
                 const char *buf, size_t count)
{
    struct atm_dev *atmdev = container_of(dev, struct atm_dev, class_dev);
    struct solos_card *card = atmdev->dev_data;
    int err;

    err = send_command(card, SOLOS_CHAN(atmdev), buf, count);

    return err?:count;
}

static DEVICE_ATTR(console, 0644, console_show, console_store);


#define SOLOS_ATTR_RO(x) static DEVICE_ATTR(x, 0444, solos_param_show, NULL);
#define SOLOS_ATTR_RW(x) static DEVICE_ATTR(x, 0644, solos_param_show, solos_param_store);

#include "solos-attrlist.c"

#undef SOLOS_ATTR_RO
#undef SOLOS_ATTR_RW

#define SOLOS_ATTR_RO(x) &dev_attr_##x.attr,
#define SOLOS_ATTR_RW(x) &dev_attr_##x.attr,

static struct attribute *solos_attrs[] = {
#include "solos-attrlist.c"
    NULL
};

static struct attribute_group solos_attr_group = {
    .attrs = solos_attrs,
    .name = "parameters",
};

static int flash_upgrade(struct solos_card *card, int chip)
{
    const struct firmware *fw;
    const char *fw_name;
    int blocksize = 0;
    int numblocks = 0;
    int offset;

    switch (chip) {
    case 0:
        fw_name = "solos-FPGA.bin";
        blocksize = FPGA_BLOCK;
        break;
    case 1:
        fw_name = "solos-Firmware.bin";
        blocksize = SOLOS_BLOCK;
        break;
    case 2:
        if (card->fpga_version > LEGACY_BUFFERS){
            fw_name = "solos-db-FPGA.bin";
            blocksize = FPGA_BLOCK;
        } else {
            dev_info(&card->dev->dev, "FPGA version doesn't support"
                    " daughter board upgrades\n");
            return -EPERM;
        }
        break;
    case 3:
        if (card->fpga_version > LEGACY_BUFFERS){
            fw_name = "solos-Firmware.bin";
            blocksize = SOLOS_BLOCK;
        } else {
            dev_info(&card->dev->dev, "FPGA version doesn't support"
                    " daughter board upgrades\n");
            return -EPERM;
        }
        break;
    default:
        return -ENODEV;
    }

    if (request_firmware(&fw, fw_name, &card->dev->dev))
        return -ENOENT;

    dev_info(&card->dev->dev, "Flash upgrade starting\n");

    numblocks = fw->size / blocksize;
    dev_info(&card->dev->dev, "Firmware size: %zd\n", fw->size);
    dev_info(&card->dev->dev, "Number of blocks: %d\n", numblocks);
    
    dev_info(&card->dev->dev, "Changing FPGA to Update mode\n");
    iowrite32(1, card->config_regs + FPGA_MODE);
    (void) ioread32(card->config_regs + FPGA_MODE); 

    /* Set mode to Chip Erase */
    if(chip == 0 || chip == 2)
        dev_info(&card->dev->dev, "Set FPGA Flash mode to FPGA Chip Erase\n");
    if(chip == 1 || chip == 3)
        dev_info(&card->dev->dev, "Set FPGA Flash mode to Solos Chip Erase\n");
    iowrite32((chip * 2), card->config_regs + FLASH_MODE);


    iowrite32(1, card->config_regs + WRITE_FLASH);
    wait_event(card->fw_wq, !ioread32(card->config_regs + FLASH_BUSY));

    for (offset = 0; offset < fw->size; offset += blocksize) {
        int i;

        /* Clear write flag */
        iowrite32(0, card->config_regs + WRITE_FLASH);

        /* Set mode to Block Write */
        /* dev_info(&card->dev->dev, "Set FPGA Flash mode to Block Write\n"); */
        iowrite32(((chip * 2) + 1), card->config_regs + FLASH_MODE);

        /* Copy block to buffer, swapping each 16 bits */
        for(i = 0; i < blocksize; i += 4) {
            uint32_t word = swahb32p((uint32_t *)(fw->data + offset + i));
            if(card->fpga_version > LEGACY_BUFFERS)
                iowrite32(word, FLASH_BUF + i);
            else
                iowrite32(word, RX_BUF(card, 3) + i);
        }

        /* Specify block number and then trigger flash write */
        iowrite32(offset / blocksize, card->config_regs + FLASH_BLOCK);
        iowrite32(1, card->config_regs + WRITE_FLASH);
        wait_event(card->fw_wq, !ioread32(card->config_regs + FLASH_BUSY));
    }

    release_firmware(fw);
    iowrite32(0, card->config_regs + WRITE_FLASH);
    iowrite32(0, card->config_regs + FPGA_MODE);
    iowrite32(0, card->config_regs + FLASH_MODE);
    dev_info(&card->dev->dev, "Returning FPGA to Data mode\n");
    return 0;
}

static irqreturn_t solos_irq(int irq, void *dev_id)
{
    struct solos_card *card = dev_id;
    int handled = 1;

    iowrite32(0, card->config_regs + IRQ_CLEAR);

    /* If we're up and running, just kick the tasklet to process TX/RX */
    if (card->atmdev[0])
        tasklet_schedule(&card->tlet);
    else
        wake_up(&card->fw_wq);

    return IRQ_RETVAL(handled);
}

void solos_bh(unsigned long card_arg)
{
    struct solos_card *card = (void *)card_arg;
    uint32_t card_flags;
    uint32_t rx_done = 0;
    int port;

    /*
     * Since fpga_tx() is going to need to read the flags under its lock,
     * it can return them to us so that we don't have to hit PCI MMIO
     * again for the same information
     */
    card_flags = fpga_tx(card);

    for (port = 0; port < card->nr_ports; port++) {
        if (card_flags & (0x10 << port)) {
            struct pkt_hdr _hdr, *header;
            struct sk_buff *skb;
            struct atm_vcc *vcc;
            int size;

            if (card->using_dma) {
                skb = card->rx_skb[port];
                card->rx_skb[port] = NULL;

                pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr,
                         RX_DMA_SIZE, PCI_DMA_FROMDEVICE);

                header = (void *)skb->data;
                size = le16_to_cpu(header->size);
                skb_put(skb, size + sizeof(*header));
                skb_pull(skb, sizeof(*header));
            } else {
                header = &_hdr;

                rx_done |= 0x10 << port;

                memcpy_fromio(header, RX_BUF(card, port), sizeof(*header));

                size = le16_to_cpu(header->size);
                if (size > (card->buffer_size - sizeof(*header))){
                    dev_warn(&card->dev->dev, "Invalid buffer size\n");
                    continue;
                }

                skb = alloc_skb(size + 1, GFP_ATOMIC);
                if (!skb) {
                    if (net_ratelimit())
                        dev_warn(&card->dev->dev, "Failed to allocate sk_buff for RX\n");
                    continue;
                }

                memcpy_fromio(skb_put(skb, size),
                          RX_BUF(card, port) + sizeof(*header),
                          size);
            }
            if (atmdebug) {
                dev_info(&card->dev->dev, "Received: port %d\n", port);
                dev_info(&card->dev->dev, "size: %d VPI: %d VCI: %d\n",
                     size, le16_to_cpu(header->vpi),
                     le16_to_cpu(header->vci));
                print_buffer(skb);
            }

            switch (le16_to_cpu(header->type)) {
            case PKT_DATA:
                vcc = find_vcc(card->atmdev[port], le16_to_cpu(header->vpi),
                           le16_to_cpu(header->vci));
                if (!vcc) {
                    if (net_ratelimit())
                        dev_warn(&card->dev->dev, "Received packet for unknown VPI.VCI %d.%d on port %d\n",
                             le16_to_cpu(header->vpi), le16_to_cpu(header->vci),
                             port);
                    continue;
                }
                atm_charge(vcc, skb->truesize);
                vcc->push(vcc, skb);
                atomic_inc(&vcc->stats->rx);
                break;

            case PKT_STATUS:
                if (process_status(card, port, skb) &&
                    net_ratelimit()) {
                    dev_warn(&card->dev->dev, "Bad status packet of %d bytes on port %d:\n", skb->len, port);
                    print_buffer(skb);
                }
                dev_kfree_skb_any(skb);
                break;

            case PKT_COMMAND:
            default: /* FIXME: Not really, surely? */
                if (process_command(card, port, skb))
                    break;
                spin_lock(&card->cli_queue_lock);
                if (skb_queue_len(&card->cli_queue[port]) > 10) {
                    if (net_ratelimit())
                        dev_warn(&card->dev->dev, "Dropping console response on port %d\n",
                             port);
                    dev_kfree_skb_any(skb);
                } else
                    skb_queue_tail(&card->cli_queue[port], skb);
                spin_unlock(&card->cli_queue_lock);
                break;
            }
        }
        /* Allocate RX skbs for any ports which need them */
        if (card->using_dma && card->atmdev[port] &&
            !card->rx_skb[port]) {
            struct sk_buff *skb = alloc_skb(RX_DMA_SIZE, GFP_ATOMIC);
            if (skb) {
                SKB_CB(skb)->dma_addr =
                    pci_map_single(card->dev, skb->data,
                               RX_DMA_SIZE, PCI_DMA_FROMDEVICE);
                iowrite32(SKB_CB(skb)->dma_addr,
                      card->config_regs + RX_DMA_ADDR(port));
                card->rx_skb[port] = skb;
            } else {
                if (net_ratelimit())
                    dev_warn(&card->dev->dev, "Failed to allocate RX skb");

                /* We'll have to try again later */
                tasklet_schedule(&card->tlet);
            }
        }
    }
    if (rx_done)
        iowrite32(rx_done, card->config_regs + FLAGS_ADDR);

    return;
}

static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci)
{
    struct hlist_head *head;
    struct atm_vcc *vcc = NULL;
    struct hlist_node *node;
    struct sock *s;

    read_lock(&vcc_sklist_lock);
    head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
    sk_for_each(s, node, head) {
        vcc = atm_sk(s);
        if (vcc->dev == dev && vcc->vci == vci &&
            vcc->vpi == vpi && vcc->qos.rxtp.traffic_class != ATM_NONE &&
            test_bit(ATM_VF_READY, &vcc->flags))
            goto out;
    }
    vcc = NULL;
 out:
    read_unlock(&vcc_sklist_lock);
    return vcc;
}

static int list_vccs(int vci)
{
    struct hlist_head *head;
    struct atm_vcc *vcc;
    struct hlist_node *node;
    struct sock *s;
    int num_found = 0;
    int i;

    read_lock(&vcc_sklist_lock);
    if (vci != 0){
        head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)];
        sk_for_each(s, node, head) {
            num_found ++;
            vcc = atm_sk(s);
            printk(KERN_DEBUG "Device: %d Vpi: %d Vci: %d\n",
                   vcc->dev->number,
                   vcc->vpi,
                   vcc->vci);
        }
    } else {
        for(i = 0; i < VCC_HTABLE_SIZE; i++){
            head = &vcc_hash[i];
            sk_for_each(s, node, head) {
                num_found ++;
                vcc = atm_sk(s);
                printk(KERN_DEBUG "Device: %d Vpi: %d Vci: %d\n",
                       vcc->dev->number,
                       vcc->vpi,
                       vcc->vci);
            }
        }
    }
    read_unlock(&vcc_sklist_lock);
    return num_found;
}


static int popen(struct atm_vcc *vcc)
{
    struct solos_card *card = vcc->dev->dev_data;
    struct sk_buff *skb;
    struct pkt_hdr *header;

    if (vcc->qos.aal != ATM_AAL5) {
        dev_warn(&card->dev->dev, "Unsupported ATM type %d\n",
             vcc->qos.aal);
        return -EINVAL;
    }

    skb = alloc_skb(sizeof(*header), GFP_ATOMIC);
    if (!skb) {
        if (net_ratelimit())
            dev_warn(&card->dev->dev, "Failed to allocate sk_buff in popen()\n");
        return -ENOMEM;
    }
    header = (void *)skb_put(skb, sizeof(*header));

    header->size = cpu_to_le16(0);
    header->vpi = cpu_to_le16(vcc->vpi);
    header->vci = cpu_to_le16(vcc->vci);
    header->type = cpu_to_le16(PKT_POPEN);

    fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, NULL);

    set_bit(ATM_VF_ADDR, &vcc->flags);
    set_bit(ATM_VF_READY, &vcc->flags);
    list_vccs(0);


    return 0;
}

static void pclose(struct atm_vcc *vcc)
{
    struct solos_card *card = vcc->dev->dev_data;
    struct sk_buff *skb;
    struct pkt_hdr *header;

    skb = alloc_skb(sizeof(*header), GFP_ATOMIC);
    if (!skb) {
        dev_warn(&card->dev->dev, "Failed to allocate sk_buff in pclose()\n");
        return;
    }
    header = (void *)skb_put(skb, sizeof(*header));

    header->size = cpu_to_le16(0);
    header->vpi = cpu_to_le16(vcc->vpi);
    header->vci = cpu_to_le16(vcc->vci);
    header->type = cpu_to_le16(PKT_PCLOSE);

    fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, NULL);

    clear_bit(ATM_VF_ADDR, &vcc->flags);
    clear_bit(ATM_VF_READY, &vcc->flags);

    /* Hold up vcc_destroy_socket() (our caller) until solos_bh() in the
       tasklet has finished processing any incoming packets (and, more to
       the point, using the vcc pointer). */
    tasklet_unlock_wait(&card->tlet);
    return;
}

static int print_buffer(struct sk_buff *buf)
{
    int len,i;
    char msg[500];
    char item[10];

    len = buf->len;
    for (i = 0; i < len; i++){
        if(i % 8 == 0)
            sprintf(msg, "%02X: ", i);

        sprintf(item,"%02X ",*(buf->data + i));
        strcat(msg, item);
        if(i % 8 == 7) {
            sprintf(item, "\n");
            strcat(msg, item);
            printk(KERN_DEBUG "%s", msg);
        }
    }
    if (i % 8 != 0) {
        sprintf(item, "\n");
        strcat(msg, item);
        printk(KERN_DEBUG "%s", msg);
    }
    printk(KERN_DEBUG "\n");

    return 0;
}

static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
               struct atm_vcc *vcc)
{
    int old_len;
    unsigned long flags;

    SKB_CB(skb)->vcc = vcc;

    spin_lock_irqsave(&card->tx_queue_lock, flags);
    old_len = skb_queue_len(&card->tx_queue[port]);
    skb_queue_tail(&card->tx_queue[port], skb);
    if (!old_len)
        card->tx_mask |= (1 << port);
    spin_unlock_irqrestore(&card->tx_queue_lock, flags);

    /* Theoretically we could just schedule the tasklet here, but
       that introduces latency we don't want -- it's noticeable */
    if (!old_len)
        fpga_tx(card);
}

static uint32_t fpga_tx(struct solos_card *card)
{
    uint32_t tx_pending, card_flags;
    uint32_t tx_started = 0;
    struct sk_buff *skb;
    struct atm_vcc *vcc;
    unsigned char port;
    unsigned long flags;

    spin_lock_irqsave(&card->tx_lock, flags);
    
    card_flags = ioread32(card->config_regs + FLAGS_ADDR);
    /*
     * The queue lock is required for _writing_ to tx_mask, but we're
     * OK to read it here without locking. The only potential update
     * that we could race with is in fpga_queue() where it sets a bit
     * for a new port... but it's going to call this function again if
     * it's doing that, anyway.
     */
    tx_pending = card->tx_mask & ~card_flags;

    for (port = 0; tx_pending; tx_pending >>= 1, port++) {
        if (tx_pending & 1) {
            struct sk_buff *oldskb = card->tx_skb[port];
            if (oldskb)
                pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
                         oldskb->len, PCI_DMA_TODEVICE);

            spin_lock(&card->tx_queue_lock);
            skb = skb_dequeue(&card->tx_queue[port]);
            if (!skb)
                card->tx_mask &= ~(1 << port);
            spin_unlock(&card->tx_queue_lock);

            if (skb && !card->using_dma) {
                memcpy_toio(TX_BUF(card, port), skb->data, skb->len);
                tx_started |= 1 << port;
                oldskb = skb; /* We're done with this skb already */
            } else if (skb && card->using_dma) {
                SKB_CB(skb)->dma_addr = pci_map_single(card->dev, skb->data,
                                       skb->len, PCI_DMA_TODEVICE);
                card->tx_skb[port] = skb;
                iowrite32(SKB_CB(skb)->dma_addr,
                      card->config_regs + TX_DMA_ADDR(port));
            }

            if (!oldskb)
                continue;

            /* Clean up and free oldskb now it's gone */
            if (atmdebug) {
                struct pkt_hdr *header = (void *)oldskb->data;
                int size = le16_to_cpu(header->size);

                skb_pull(oldskb, sizeof(*header));
                dev_info(&card->dev->dev, "Transmitted: port %d\n",
                     port);
                dev_info(&card->dev->dev, "size: %d VPI: %d VCI: %d\n",
                     size, le16_to_cpu(header->vpi),
                     le16_to_cpu(header->vci));
                print_buffer(oldskb);
            }

            vcc = SKB_CB(oldskb)->vcc;

            if (vcc) {
                atomic_inc(&vcc->stats->tx);
                solos_pop(vcc, oldskb);
            } else
                dev_kfree_skb_irq(oldskb);

        }
    }
    /* For non-DMA TX, write the 'TX start' bit for all four ports simultaneously */
    if (tx_started)
        iowrite32(tx_started, card->config_regs + FLAGS_ADDR);

    spin_unlock_irqrestore(&card->tx_lock, flags);
    return card_flags;
}

static int psend(struct atm_vcc *vcc, struct sk_buff *skb)
{
    struct solos_card *card = vcc->dev->dev_data;
    struct pkt_hdr *header;
    int pktlen;

    pktlen = skb->len;
    if (pktlen > (BUF_SIZE - sizeof(*header))) {
        dev_warn(&card->dev->dev, "Length of PDU is too large. Dropping PDU.\n");
        solos_pop(vcc, skb);
        return 0;
    }

    if (!skb_clone_writable(skb, sizeof(*header))) {
        int expand_by = 0;
        int ret;

        if (skb_headroom(skb) < sizeof(*header))
            expand_by = sizeof(*header) - skb_headroom(skb);

        ret = pskb_expand_head(skb, expand_by, 0, GFP_ATOMIC);
        if (ret) {
            dev_warn(&card->dev->dev, "pskb_expand_head failed.\n");
            solos_pop(vcc, skb);
            return ret;
        }
    }

    header = (void *)skb_push(skb, sizeof(*header));

    /* This does _not_ include the size of the header */
    header->size = cpu_to_le16(pktlen);
    header->vpi = cpu_to_le16(vcc->vpi);
    header->vci = cpu_to_le16(vcc->vci);
    header->type = cpu_to_le16(PKT_DATA);

    fpga_queue(card, SOLOS_CHAN(vcc->dev), skb, vcc);

    return 0;
}

static struct atmdev_ops fpga_ops = {
    .open =     popen,
    .close =    pclose,
    .ioctl =    NULL,
    .getsockopt =   NULL,
    .setsockopt =   NULL,
    .send =     psend,
    .send_oam = NULL,
    .phy_put =  NULL,
    .phy_get =  NULL,
    .change_qos =   NULL,
    .proc_read =    NULL,
    .owner =    THIS_MODULE
};

static int fpga_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
    int err;
    uint16_t fpga_ver;
    uint8_t major_ver, minor_ver;
    uint32_t data32;
    struct solos_card *card;

    card = kzalloc(sizeof(*card), GFP_KERNEL);
    if (!card)
        return -ENOMEM;

    card->dev = dev;
    init_waitqueue_head(&card->fw_wq);
    init_waitqueue_head(&card->param_wq);

    err = pci_enable_device(dev);
    if (err) {
        dev_warn(&dev->dev,  "Failed to enable PCI device\n");
        goto out;
    }

    err = pci_set_dma_mask(dev, DMA_BIT_MASK(32));
    if (err) {
        dev_warn(&dev->dev, "Failed to set 32-bit DMA mask\n");
        goto out;
    }

    err = pci_request_regions(dev, "solos");
    if (err) {
        dev_warn(&dev->dev, "Failed to request regions\n");
        goto out;
    }

    card->config_regs = pci_iomap(dev, 0, CONFIG_RAM_SIZE);
    if (!card->config_regs) {
        dev_warn(&dev->dev, "Failed to ioremap config registers\n");
        goto out_release_regions;
    }
    card->buffers = pci_iomap(dev, 1, DATA_RAM_SIZE);
    if (!card->buffers) {
        dev_warn(&dev->dev, "Failed to ioremap data buffers\n");
        goto out_unmap_config;
    }

    if (reset) {
        iowrite32(1, card->config_regs + FPGA_MODE);
        data32 = ioread32(card->config_regs + FPGA_MODE); 

        iowrite32(0, card->config_regs + FPGA_MODE);
        data32 = ioread32(card->config_regs + FPGA_MODE); 
    }

    data32 = ioread32(card->config_regs + FPGA_VER);
    fpga_ver = (data32 & 0x0000FFFF);
    major_ver = ((data32 & 0xFF000000) >> 24);
    minor_ver = ((data32 & 0x00FF0000) >> 16);
    card->fpga_version = FPGA_VERSION(major_ver,minor_ver);
    if (card->fpga_version > LEGACY_BUFFERS)
        card->buffer_size = BUF_SIZE;
    else
        card->buffer_size = OLD_BUF_SIZE;
    dev_info(&dev->dev, "Solos FPGA Version %d.%02d svn-%d\n",
         major_ver, minor_ver, fpga_ver);

    if (fpga_ver < 37 && (fpga_upgrade || firmware_upgrade ||
                  db_fpga_upgrade || db_firmware_upgrade)) {
        dev_warn(&dev->dev,
             "FPGA too old; cannot upgrade flash. Use JTAG.\n");
        fpga_upgrade = firmware_upgrade = 0;
        db_fpga_upgrade = db_firmware_upgrade = 0;
    }

    if (card->fpga_version >= DMA_SUPPORTED) {
        pci_set_master(dev);
        card->using_dma = 1;
    } else {
        card->using_dma = 0;
        /* Set RX empty flag for all ports */
        iowrite32(0xF0, card->config_regs + FLAGS_ADDR);
    }

    data32 = ioread32(card->config_regs + PORTS);
    card->nr_ports = (data32 & 0x000000FF);

    pci_set_drvdata(dev, card);

    tasklet_init(&card->tlet, solos_bh, (unsigned long)card);
    spin_lock_init(&card->tx_lock);
    spin_lock_init(&card->tx_queue_lock);
    spin_lock_init(&card->cli_queue_lock);
    spin_lock_init(&card->param_queue_lock);
    INIT_LIST_HEAD(&card->param_queue);

    err = request_irq(dev->irq, solos_irq, IRQF_SHARED,
              "solos-pci", card);
    if (err) {
        dev_dbg(&card->dev->dev, "Failed to request interrupt IRQ: %d\n", dev->irq);
        goto out_unmap_both;
    }

    iowrite32(1, card->config_regs + IRQ_EN_ADDR);

    if (fpga_upgrade)
        flash_upgrade(card, 0);

    if (firmware_upgrade)
        flash_upgrade(card, 1);

    if (db_fpga_upgrade)
        flash_upgrade(card, 2);

    if (db_firmware_upgrade)
        flash_upgrade(card, 3);

    err = atm_init(card, &dev->dev);
    if (err)
        goto out_free_irq;

    return 0;

 out_free_irq:
    iowrite32(0, card->config_regs + IRQ_EN_ADDR);
    free_irq(dev->irq, card);
    tasklet_kill(&card->tlet);
    
 out_unmap_both:
    pci_set_drvdata(dev, NULL);
    pci_iounmap(dev, card->buffers);
 out_unmap_config:
    pci_iounmap(dev, card->config_regs);
 out_release_regions:
    pci_release_regions(dev);
 out:
    kfree(card);
    return err;
}

static int atm_init(struct solos_card *card, struct device *parent)
{
    int i;

    for (i = 0; i < card->nr_ports; i++) {
        struct sk_buff *skb;
        struct pkt_hdr *header;

        skb_queue_head_init(&card->tx_queue[i]);
        skb_queue_head_init(&card->cli_queue[i]);

        card->atmdev[i] = atm_dev_register("solos-pci", parent, &fpga_ops, -1, NULL);
        if (!card->atmdev[i]) {
            dev_err(&card->dev->dev, "Could not register ATM device %d\n", i);
            atm_remove(card);
            return -ENODEV;
        }
        if (device_create_file(&card->atmdev[i]->class_dev, &dev_attr_console))
            dev_err(&card->dev->dev, "Could not register console for ATM device %d\n", i);
        if (sysfs_create_group(&card->atmdev[i]->class_dev.kobj, &solos_attr_group))
            dev_err(&card->dev->dev, "Could not register parameter group for ATM device %d\n", i);

        dev_info(&card->dev->dev, "Registered ATM device %d\n", card->atmdev[i]->number);

        card->atmdev[i]->ci_range.vpi_bits = 8;
        card->atmdev[i]->ci_range.vci_bits = 16;
        card->atmdev[i]->dev_data = card;
        card->atmdev[i]->phy_data = (void *)(unsigned long)i;
        atm_dev_signal_change(card->atmdev[i], ATM_PHY_SIG_FOUND);

        skb = alloc_skb(sizeof(*header), GFP_ATOMIC);
        if (!skb) {
            dev_warn(&card->dev->dev, "Failed to allocate sk_buff in atm_init()\n");
            continue;
        }

        header = (void *)skb_put(skb, sizeof(*header));

        header->size = cpu_to_le16(0);
        header->vpi = cpu_to_le16(0);
        header->vci = cpu_to_le16(0);
        header->type = cpu_to_le16(PKT_STATUS);

        fpga_queue(card, i, skb, NULL);
    }
    return 0;
}

static void atm_remove(struct solos_card *card)
{
    int i;

    for (i = 0; i < card->nr_ports; i++) {
        if (card->atmdev[i]) {
            struct sk_buff *skb;

            dev_info(&card->dev->dev, "Unregistering ATM device %d\n", card->atmdev[i]->number);

            sysfs_remove_group(&card->atmdev[i]->class_dev.kobj, &solos_attr_group);
            atm_dev_deregister(card->atmdev[i]);

            skb = card->rx_skb[i];
            if (skb) {
                pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr,
                         RX_DMA_SIZE, PCI_DMA_FROMDEVICE);
                dev_kfree_skb(skb);
            }
            skb = card->tx_skb[i];
            if (skb) {
                pci_unmap_single(card->dev, SKB_CB(skb)->dma_addr,
                         skb->len, PCI_DMA_TODEVICE);
                dev_kfree_skb(skb);
            }
            while ((skb = skb_dequeue(&card->tx_queue[i])))
                dev_kfree_skb(skb);
 
        }
    }
}

static void fpga_remove(struct pci_dev *dev)
{
    struct solos_card *card = pci_get_drvdata(dev);
    
    /* Disable IRQs */
    iowrite32(0, card->config_regs + IRQ_EN_ADDR);

    /* Reset FPGA */
    iowrite32(1, card->config_regs + FPGA_MODE);
    (void)ioread32(card->config_regs + FPGA_MODE); 

    atm_remove(card);

    free_irq(dev->irq, card);
    tasklet_kill(&card->tlet);

    /* Release device from reset */
    iowrite32(0, card->config_regs + FPGA_MODE);
    (void)ioread32(card->config_regs + FPGA_MODE); 

    pci_iounmap(dev, card->buffers);
    pci_iounmap(dev, card->config_regs);

    pci_release_regions(dev);
    pci_disable_device(dev);

    pci_set_drvdata(dev, NULL);
    kfree(card);
}

static struct pci_device_id fpga_pci_tbl[] __devinitdata = {
    { 0x10ee, 0x0300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
    { 0, }
};

MODULE_DEVICE_TABLE(pci,fpga_pci_tbl);

static struct pci_driver fpga_driver = {
    .name =     "solos",
    .id_table = fpga_pci_tbl,
    .probe =    fpga_probe,
    .remove =   fpga_remove,
};


static int __init solos_pci_init(void)
{
    printk(KERN_INFO "Solos PCI Driver Version %s\n", VERSION);
    return pci_register_driver(&fpga_driver);
}

static void __exit solos_pci_exit(void)
{
    pci_unregister_driver(&fpga_driver);
    printk(KERN_INFO "Solos PCI Driver %s Unloaded\n", VERSION);
}

module_init(solos_pci_init);
module_exit(solos_pci_exit);