x86: cpa: move clflush_cache_range()

[wrt350n-kernel.git] / drivers / net / ps3_gelic_net.c

/*
 *  PS3 gelic network driver.
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2006, 2007 Sony Corporation
 *
 * This file is based on: spider_net.c
 *
 * (C) Copyright IBM Corp. 2005
 *
 * Authors : Utz Bacher <utz.bacher@de.ibm.com>
 *           Jens Osterkamp <Jens.Osterkamp@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/module.h>

#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>

#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>

#include <linux/dma-mapping.h>
#include <net/checksum.h>
#include <asm/firmware.h>
#include <asm/ps3.h>
#include <asm/lv1call.h>

#include "ps3_gelic_net.h"

#define DRV_NAME "Gelic Network Driver"
#define DRV_VERSION "1.0"

MODULE_AUTHOR("SCE Inc.");
MODULE_DESCRIPTION("Gelic Network driver");
MODULE_LICENSE("GPL");

static inline struct device *ctodev(struct gelic_net_card *card)
{
        return &card->dev->core;
}
static inline unsigned int bus_id(struct gelic_net_card *card)
{
        return card->dev->bus_id;
}
static inline unsigned int dev_id(struct gelic_net_card *card)
{
        return card->dev->dev_id;
}

/* set irq_mask */
static int gelic_net_set_irq_mask(struct gelic_net_card *card, u64 mask)
{
        int status;

        status = lv1_net_set_interrupt_mask(bus_id(card), dev_id(card),
                                            mask, 0);
        if (status)
                dev_info(ctodev(card),
                         "lv1_net_set_interrupt_mask failed %d\n", status);
        return status;
}
static inline void gelic_net_rx_irq_on(struct gelic_net_card *card)
{
        gelic_net_set_irq_mask(card, card->ghiintmask | GELIC_NET_RXINT);
}
static inline void gelic_net_rx_irq_off(struct gelic_net_card *card)
{
        gelic_net_set_irq_mask(card, card->ghiintmask & ~GELIC_NET_RXINT);
}
/**
 * gelic_net_get_descr_status -- returns the status of a descriptor
 * @descr: descriptor to look at
 *
 * returns the status as in the dmac_cmd_status field of the descriptor
 */
static enum gelic_net_descr_status
gelic_net_get_descr_status(struct gelic_net_descr *descr)
{
        u32 cmd_status;

        cmd_status = descr->dmac_cmd_status;
        cmd_status >>= GELIC_NET_DESCR_IND_PROC_SHIFT;
        return cmd_status;
}

/**
 * gelic_net_set_descr_status -- sets the status of a descriptor
 * @descr: descriptor to change
 * @status: status to set in the descriptor
 *
 * changes the status to the specified value. Doesn't change other bits
 * in the status
 */
static void gelic_net_set_descr_status(struct gelic_net_descr *descr,
                                       enum gelic_net_descr_status status)
{
        u32 cmd_status;

        /* read the status */
        cmd_status = descr->dmac_cmd_status;
        /* clean the upper 4 bits */
        cmd_status &= GELIC_NET_DESCR_IND_PROC_MASKO;
        /* add the status to it */
        cmd_status |= ((u32)status) << GELIC_NET_DESCR_IND_PROC_SHIFT;
        /* and write it back */
        descr->dmac_cmd_status = cmd_status;
        /*
         * dma_cmd_status field is used to indicate whether the descriptor
         * is valid or not.
         * Usually caller of this function wants to inform that to the
         * hardware, so we assure here the hardware sees the change.
         */
        wmb();
}

/**
 * gelic_net_free_chain - free descriptor chain
 * @card: card structure
 * @descr_in: address of desc
 */
static void gelic_net_free_chain(struct gelic_net_card *card,
                                 struct gelic_net_descr *descr_in)
{
        struct gelic_net_descr *descr;

        for (descr = descr_in; descr && descr->bus_addr; descr = descr->next) {
                dma_unmap_single(ctodev(card), descr->bus_addr,
                                 GELIC_NET_DESCR_SIZE, DMA_BIDIRECTIONAL);
                descr->bus_addr = 0;
        }
}

/**
 * gelic_net_init_chain - links descriptor chain
 * @card: card structure
 * @chain: address of chain
 * @start_descr: address of descriptor array
 * @no: number of descriptors
 *
 * we manage a circular list that mirrors the hardware structure,
 * except that the hardware uses bus addresses.
 *
 * returns 0 on success, <0 on failure
 */
static int gelic_net_init_chain(struct gelic_net_card *card,
                                struct gelic_net_descr_chain *chain,
                                struct gelic_net_descr *start_descr, int no)
{
        int i;
        struct gelic_net_descr *descr;

        descr = start_descr;
        memset(descr, 0, sizeof(*descr) * no);

        /* set up the hardware pointers in each descriptor */
        for (i = 0; i < no; i++, descr++) {
                gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
                descr->bus_addr =
                        dma_map_single(ctodev(card), descr,
                                       GELIC_NET_DESCR_SIZE,
                                       DMA_BIDIRECTIONAL);

                if (!descr->bus_addr)
                        goto iommu_error;

                descr->next = descr + 1;
                descr->prev = descr - 1;
        }
        /* make them as ring */
        (descr - 1)->next = start_descr;
        start_descr->prev = (descr - 1);

        /* chain bus addr of hw descriptor */
        descr = start_descr;
        for (i = 0; i < no; i++, descr++) {
                descr->next_descr_addr = descr->next->bus_addr;
        }

        chain->head = start_descr;
        chain->tail = start_descr;

        /* do not chain last hw descriptor */
        (descr - 1)->next_descr_addr = 0;

        return 0;

iommu_error:
        for (i--, descr--; 0 <= i; i--, descr--)
                if (descr->bus_addr)
                        dma_unmap_single(ctodev(card), descr->bus_addr,
                                         GELIC_NET_DESCR_SIZE,
                                         DMA_BIDIRECTIONAL);
        return -ENOMEM;
}

/**
 * gelic_net_prepare_rx_descr - reinitializes a rx descriptor
 * @card: card structure
 * @descr: descriptor to re-init
 *
 * return 0 on succes, <0 on failure
 *
 * allocates a new rx skb, iommu-maps it and attaches it to the descriptor.
 * Activate the descriptor state-wise
 */
static int gelic_net_prepare_rx_descr(struct gelic_net_card *card,
                                      struct gelic_net_descr *descr)
{
        int offset;
        unsigned int bufsize;

        if (gelic_net_get_descr_status(descr) !=  GELIC_NET_DESCR_NOT_IN_USE) {
                dev_info(ctodev(card), "%s: ERROR status \n", __func__);
        }
        /* we need to round up the buffer size to a multiple of 128 */
        bufsize = ALIGN(GELIC_NET_MAX_MTU, GELIC_NET_RXBUF_ALIGN);

        /* and we need to have it 128 byte aligned, therefore we allocate a
         * bit more */
        descr->skb = netdev_alloc_skb(card->netdev,
                bufsize + GELIC_NET_RXBUF_ALIGN - 1);
        if (!descr->skb) {
                descr->buf_addr = 0; /* tell DMAC don't touch memory */
                dev_info(ctodev(card),
                         "%s:allocate skb failed !!\n", __func__);
                return -ENOMEM;
        }
        descr->buf_size = bufsize;
        descr->dmac_cmd_status = 0;
        descr->result_size = 0;
        descr->valid_size = 0;
        descr->data_error = 0;

        offset = ((unsigned long)descr->skb->data) &
                (GELIC_NET_RXBUF_ALIGN - 1);
        if (offset)
                skb_reserve(descr->skb, GELIC_NET_RXBUF_ALIGN - offset);
        /* io-mmu-map the skb */
        descr->buf_addr = dma_map_single(ctodev(card), descr->skb->data,
                                         GELIC_NET_MAX_MTU,
                                         DMA_FROM_DEVICE);
        if (!descr->buf_addr) {
                dev_kfree_skb_any(descr->skb);
                descr->skb = NULL;
                dev_info(ctodev(card),
                         "%s:Could not iommu-map rx buffer\n", __func__);
                gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
                return -ENOMEM;
        } else {
                gelic_net_set_descr_status(descr, GELIC_NET_DESCR_CARDOWNED);
                return 0;
        }
}

/**
 * gelic_net_release_rx_chain - free all skb of rx descr
 * @card: card structure
 *
 */
static void gelic_net_release_rx_chain(struct gelic_net_card *card)
{
        struct gelic_net_descr *descr = card->rx_chain.head;

        do {
                if (descr->skb) {
                        dma_unmap_single(ctodev(card),
                                         descr->buf_addr,
                                         descr->skb->len,
                                         DMA_FROM_DEVICE);
                        descr->buf_addr = 0;
                        dev_kfree_skb_any(descr->skb);
                        descr->skb = NULL;
                        gelic_net_set_descr_status(descr,
                                                   GELIC_NET_DESCR_NOT_IN_USE);
                }
                descr = descr->next;
        } while (descr != card->rx_chain.head);
}

/**
 * gelic_net_fill_rx_chain - fills descriptors/skbs in the rx chains
 * @card: card structure
 *
 * fills all descriptors in the rx chain: allocates skbs
 * and iommu-maps them.
 * returns 0 on success, <0 on failure
 */
static int gelic_net_fill_rx_chain(struct gelic_net_card *card)
{
        struct gelic_net_descr *descr = card->rx_chain.head;
        int ret;

        do {
                if (!descr->skb) {
                        ret = gelic_net_prepare_rx_descr(card, descr);
                        if (ret)
                                goto rewind;
                }
                descr = descr->next;
        } while (descr != card->rx_chain.head);

        return 0;
rewind:
        gelic_net_release_rx_chain(card);
        return ret;
}

/**
 * gelic_net_alloc_rx_skbs - allocates rx skbs in rx descriptor chains
 * @card: card structure
 *
 * returns 0 on success, <0 on failure
 */
static int gelic_net_alloc_rx_skbs(struct gelic_net_card *card)
{
        struct gelic_net_descr_chain *chain;
        int ret;
        chain = &card->rx_chain;
        ret = gelic_net_fill_rx_chain(card);
        chain->head = card->rx_top->prev; /* point to the last */
        return ret;
}

/**
 * gelic_net_release_tx_descr - processes a used tx descriptor
 * @card: card structure
 * @descr: descriptor to release
 *
 * releases a used tx descriptor (unmapping, freeing of skb)
 */
static void gelic_net_release_tx_descr(struct gelic_net_card *card,
                            struct gelic_net_descr *descr)
{
        struct sk_buff *skb = descr->skb;

        BUG_ON(!(descr->data_status & (1 << GELIC_NET_TXDESC_TAIL)));

        dma_unmap_single(ctodev(card), descr->buf_addr, skb->len,
                         DMA_TO_DEVICE);
        dev_kfree_skb_any(skb);

        descr->buf_addr = 0;
        descr->buf_size = 0;
        descr->next_descr_addr = 0;
        descr->result_size = 0;
        descr->valid_size = 0;
        descr->data_status = 0;
        descr->data_error = 0;
        descr->skb = NULL;

        /* set descr status */
        gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);
}

/**
 * gelic_net_release_tx_chain - processes sent tx descriptors
 * @card: adapter structure
 * @stop: net_stop sequence
 *
 * releases the tx descriptors that gelic has finished with
 */
static void gelic_net_release_tx_chain(struct gelic_net_card *card, int stop)
{
        struct gelic_net_descr_chain *tx_chain;
        enum gelic_net_descr_status status;
        int release = 0;

        for (tx_chain = &card->tx_chain;
             tx_chain->head != tx_chain->tail && tx_chain->tail;
             tx_chain->tail = tx_chain->tail->next) {
                status = gelic_net_get_descr_status(tx_chain->tail);
                switch (status) {
                case GELIC_NET_DESCR_RESPONSE_ERROR:
                case GELIC_NET_DESCR_PROTECTION_ERROR:
                case GELIC_NET_DESCR_FORCE_END:
                        if (printk_ratelimit())
                                dev_info(ctodev(card),
                                         "%s: forcing end of tx descriptor " \
                                         "with status %x\n",
                                         __func__, status);
                        card->netdev->stats.tx_dropped++;
                        break;

                case GELIC_NET_DESCR_COMPLETE:
                        if (tx_chain->tail->skb) {
                                card->netdev->stats.tx_packets++;
                                card->netdev->stats.tx_bytes +=
                                        tx_chain->tail->skb->len;
                        }
                        break;

                case GELIC_NET_DESCR_CARDOWNED:
                        /* pending tx request */
                default:
                        /* any other value (== GELIC_NET_DESCR_NOT_IN_USE) */
                        if (!stop)
                                goto out;
                }
                gelic_net_release_tx_descr(card, tx_chain->tail);
                release ++;
        }
out:
        if (!stop && release)
                netif_wake_queue(card->netdev);
}

/**
 * gelic_net_set_multi - sets multicast addresses and promisc flags
 * @netdev: interface device structure
 *
 * gelic_net_set_multi configures multicast addresses as needed for the
 * netdev interface. It also sets up multicast, allmulti and promisc
 * flags appropriately
 */
static void gelic_net_set_multi(struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);
        struct dev_mc_list *mc;
        unsigned int i;
        uint8_t *p;
        u64 addr;
        int status;

        /* clear all multicast address */
        status = lv1_net_remove_multicast_address(bus_id(card), dev_id(card),
                                                  0, 1);
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_remove_multicast_address failed %d\n",
                        status);
        /* set broadcast address */
        status = lv1_net_add_multicast_address(bus_id(card), dev_id(card),
                                               GELIC_NET_BROADCAST_ADDR, 0);
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_add_multicast_address failed, %d\n",
                        status);

        if (netdev->flags & IFF_ALLMULTI
                || netdev->mc_count > GELIC_NET_MC_COUNT_MAX) { /* list max */
                status = lv1_net_add_multicast_address(bus_id(card),
                                                       dev_id(card),
                                                       0, 1);
                if (status)
                        dev_err(ctodev(card),
                                "lv1_net_add_multicast_address failed, %d\n",
                                status);
                return;
        }

        /* set multicast address */
        for (mc = netdev->mc_list; mc; mc = mc->next) {
                addr = 0;
                p = mc->dmi_addr;
                for (i = 0; i < ETH_ALEN; i++) {
                        addr <<= 8;
                        addr |= *p++;
                }
                status = lv1_net_add_multicast_address(bus_id(card),
                                                       dev_id(card),
                                                       addr, 0);
                if (status)
                        dev_err(ctodev(card),
                                "lv1_net_add_multicast_address failed, %d\n",
                                status);
        }
}

/**
 * gelic_net_enable_rxdmac - enables the receive DMA controller
 * @card: card structure
 *
 * gelic_net_enable_rxdmac enables the DMA controller by setting RX_DMA_EN
 * in the GDADMACCNTR register
 */
static inline void gelic_net_enable_rxdmac(struct gelic_net_card *card)
{
        int status;

        status = lv1_net_start_rx_dma(bus_id(card), dev_id(card),
                                card->rx_chain.tail->bus_addr, 0);
        if (status)
                dev_info(ctodev(card),
                         "lv1_net_start_rx_dma failed, status=%d\n", status);
}

/**
 * gelic_net_disable_rxdmac - disables the receive DMA controller
 * @card: card structure
 *
 * gelic_net_disable_rxdmac terminates processing on the DMA controller by
 * turing off DMA and issueing a force end
 */
static inline void gelic_net_disable_rxdmac(struct gelic_net_card *card)
{
        int status;

        /* this hvc blocks until the DMA in progress really stopped */
        status = lv1_net_stop_rx_dma(bus_id(card), dev_id(card), 0);
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_stop_rx_dma faild, %d\n", status);
}

/**
 * gelic_net_disable_txdmac - disables the transmit DMA controller
 * @card: card structure
 *
 * gelic_net_disable_txdmac terminates processing on the DMA controller by
 * turing off DMA and issueing a force end
 */
static inline void gelic_net_disable_txdmac(struct gelic_net_card *card)
{
        int status;

        /* this hvc blocks until the DMA in progress really stopped */
        status = lv1_net_stop_tx_dma(bus_id(card), dev_id(card), 0);
        if (status)
                dev_err(ctodev(card),
                        "lv1_net_stop_tx_dma faild, status=%d\n", status);
}

/**
 * gelic_net_stop - called upon ifconfig down
 * @netdev: interface device structure
 *
 * always returns 0
 */
static int gelic_net_stop(struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);

        napi_disable(&card->napi);
        netif_stop_queue(netdev);

        /* turn off DMA, force end */
        gelic_net_disable_rxdmac(card);
        gelic_net_disable_txdmac(card);

        gelic_net_set_irq_mask(card, 0);

        /* disconnect event port */
        free_irq(card->netdev->irq, card->netdev);
        ps3_sb_event_receive_port_destroy(card->dev, card->netdev->irq);
        card->netdev->irq = NO_IRQ;

        netif_carrier_off(netdev);

        /* release chains */
        gelic_net_release_tx_chain(card, 1);
        gelic_net_release_rx_chain(card);

        gelic_net_free_chain(card, card->tx_top);
        gelic_net_free_chain(card, card->rx_top);

        return 0;
}

/**
 * gelic_net_get_next_tx_descr - returns the next available tx descriptor
 * @card: device structure to get descriptor from
 *
 * returns the address of the next descriptor, or NULL if not available.
 */
static struct gelic_net_descr *
gelic_net_get_next_tx_descr(struct gelic_net_card *card)
{
        if (!card->tx_chain.head)
                return NULL;
        /*  see if the next descriptor is free */
        if (card->tx_chain.tail != card->tx_chain.head->next &&
            gelic_net_get_descr_status(card->tx_chain.head) ==
            GELIC_NET_DESCR_NOT_IN_USE)
                return card->tx_chain.head;
        else
                return NULL;

}

/**
 * gelic_net_set_txdescr_cmdstat - sets the tx descriptor command field
 * @descr: descriptor structure to fill out
 * @skb: packet to consider
 *
 * fills out the command and status field of the descriptor structure,
 * depending on hardware checksum settings. This function assumes a wmb()
 * has executed before.
 */
static void gelic_net_set_txdescr_cmdstat(struct gelic_net_descr *descr,
                                          struct sk_buff *skb)
{
        if (skb->ip_summed != CHECKSUM_PARTIAL)
                descr->dmac_cmd_status = GELIC_NET_DMAC_CMDSTAT_NOCS |
                        GELIC_NET_DMAC_CMDSTAT_END_FRAME;
        else {
                /* is packet ip?
                 * if yes: tcp? udp? */
                if (skb->protocol == htons(ETH_P_IP)) {
                        if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                                descr->dmac_cmd_status =
                                        GELIC_NET_DMAC_CMDSTAT_TCPCS |
                                        GELIC_NET_DMAC_CMDSTAT_END_FRAME;

                        else if (ip_hdr(skb)->protocol == IPPROTO_UDP)
                                descr->dmac_cmd_status =
                                        GELIC_NET_DMAC_CMDSTAT_UDPCS |
                                        GELIC_NET_DMAC_CMDSTAT_END_FRAME;
                        else    /*
                                 * the stack should checksum non-tcp and non-udp
                                 * packets on his own: NETIF_F_IP_CSUM
                                 */
                                descr->dmac_cmd_status =
                                        GELIC_NET_DMAC_CMDSTAT_NOCS |
                                        GELIC_NET_DMAC_CMDSTAT_END_FRAME;
                }
        }
}

static inline struct sk_buff *gelic_put_vlan_tag(struct sk_buff *skb,
                                                 unsigned short tag)
{
        struct vlan_ethhdr *veth;
        static unsigned int c;

        if (skb_headroom(skb) < VLAN_HLEN) {
                struct sk_buff *sk_tmp = skb;
                pr_debug("%s: hd=%d c=%ud\n", __func__, skb_headroom(skb), c);
                skb = skb_realloc_headroom(sk_tmp, VLAN_HLEN);
                if (!skb)
                        return NULL;
                dev_kfree_skb_any(sk_tmp);
        }
        veth = (struct vlan_ethhdr *)skb_push(skb, VLAN_HLEN);

        /* Move the mac addresses to the top of buffer */
        memmove(skb->data, skb->data + VLAN_HLEN, 2 * ETH_ALEN);

        veth->h_vlan_proto = __constant_htons(ETH_P_8021Q);
        veth->h_vlan_TCI = htons(tag);

        return skb;
}

/**
 * gelic_net_prepare_tx_descr_v - get dma address of skb_data
 * @card: card structure
 * @descr: descriptor structure
 * @skb: packet to use
 *
 * returns 0 on success, <0 on failure.
 *
 */
static int gelic_net_prepare_tx_descr_v(struct gelic_net_card *card,
                                        struct gelic_net_descr *descr,
                                        struct sk_buff *skb)
{
        dma_addr_t buf;

        if (card->vlan_index != -1) {
                struct sk_buff *skb_tmp;
                skb_tmp = gelic_put_vlan_tag(skb,
                                             card->vlan_id[card->vlan_index]);
                if (!skb_tmp)
                        return -ENOMEM;
                skb = skb_tmp;
        }

        buf = dma_map_single(ctodev(card), skb->data, skb->len, DMA_TO_DEVICE);

        if (!buf) {
                dev_err(ctodev(card),
                        "dma map 2 failed (%p, %i). Dropping packet\n",
                        skb->data, skb->len);
                return -ENOMEM;
        }

        descr->buf_addr = buf;
        descr->buf_size = skb->len;
        descr->skb = skb;
        descr->data_status = 0;
        descr->next_descr_addr = 0; /* terminate hw descr */
        gelic_net_set_txdescr_cmdstat(descr, skb);

        /* bump free descriptor pointer */
        card->tx_chain.head = descr->next;
        return 0;
}

/**
 * gelic_net_kick_txdma - enables TX DMA processing
 * @card: card structure
 * @descr: descriptor address to enable TX processing at
 *
 */
static int gelic_net_kick_txdma(struct gelic_net_card *card,
                                struct gelic_net_descr *descr)
{
        int status = 0;

        if (card->tx_dma_progress)
                return 0;

        if (gelic_net_get_descr_status(descr) == GELIC_NET_DESCR_CARDOWNED) {
                card->tx_dma_progress = 1;
                status = lv1_net_start_tx_dma(bus_id(card), dev_id(card),
                                              descr->bus_addr, 0);
                if (status)
                        dev_info(ctodev(card), "lv1_net_start_txdma failed," \
                                 "status=%d\n", status);
        }
        return status;
}

/**
 * gelic_net_xmit - transmits a frame over the device
 * @skb: packet to send out
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 */
static int gelic_net_xmit(struct sk_buff *skb, struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);
        struct gelic_net_descr *descr;
        int result;
        unsigned long flags;

        spin_lock_irqsave(&card->tx_dma_lock, flags);

        gelic_net_release_tx_chain(card, 0);

        descr = gelic_net_get_next_tx_descr(card);
        if (!descr) {
                /*
                 * no more descriptors free
                 */
                netif_stop_queue(netdev);
                spin_unlock_irqrestore(&card->tx_dma_lock, flags);
                return NETDEV_TX_BUSY;
        }

        result = gelic_net_prepare_tx_descr_v(card, descr, skb);
        if (result) {
                /*
                 * DMA map failed.  As chanses are that failure
                 * would continue, just release skb and return
                 */
                card->netdev->stats.tx_dropped++;
                dev_kfree_skb_any(skb);
                spin_unlock_irqrestore(&card->tx_dma_lock, flags);
                return NETDEV_TX_OK;
        }
        /*
         * link this prepared descriptor to previous one
         * to achieve high performance
         */
        descr->prev->next_descr_addr = descr->bus_addr;
        /*
         * as hardware descriptor is modified in the above lines,
         * ensure that the hardware sees it
         */
        wmb();
        if (gelic_net_kick_txdma(card, descr)) {
                /*
                 * kick failed.
                 * release descriptors which were just prepared
                 */
                card->netdev->stats.tx_dropped++;
                gelic_net_release_tx_descr(card, descr);
                gelic_net_release_tx_descr(card, descr->next);
                card->tx_chain.tail = descr->next->next;
                dev_info(ctodev(card), "%s: kick failure\n", __func__);
        } else {
                /* OK, DMA started/reserved */
                netdev->trans_start = jiffies;
        }

        spin_unlock_irqrestore(&card->tx_dma_lock, flags);
        return NETDEV_TX_OK;
}

/**
 * gelic_net_pass_skb_up - takes an skb from a descriptor and passes it on
 * @descr: descriptor to process
 * @card: card structure
 *
 * iommu-unmaps the skb, fills out skb structure and passes the data to the
 * stack. The descriptor state is not changed.
 */
static void gelic_net_pass_skb_up(struct gelic_net_descr *descr,
                                 struct gelic_net_card *card)
{
        struct sk_buff *skb;
        struct net_device *netdev;
        u32 data_status, data_error;

        data_status = descr->data_status;
        data_error = descr->data_error;
        netdev = card->netdev;
        /* unmap skb buffer */
        skb = descr->skb;
        dma_unmap_single(ctodev(card), descr->buf_addr, GELIC_NET_MAX_MTU,
                         DMA_FROM_DEVICE);

        skb_put(skb, descr->valid_size? descr->valid_size : descr->result_size);
        if (!descr->valid_size)
                dev_info(ctodev(card), "buffer full %x %x %x\n",
                         descr->result_size, descr->buf_size,
                         descr->dmac_cmd_status);

        descr->skb = NULL;
        /*
         * the card put 2 bytes vlan tag in front
         * of the ethernet frame
         */
        skb_pull(skb, 2);
        skb->protocol = eth_type_trans(skb, netdev);

        /* checksum offload */
        if (card->rx_csum) {
                if ((data_status & GELIC_NET_DATA_STATUS_CHK_MASK) &&
                    (!(data_error & GELIC_NET_DATA_ERROR_CHK_MASK)))
                        skb->ip_summed = CHECKSUM_UNNECESSARY;
                else
                        skb->ip_summed = CHECKSUM_NONE;
        } else
                skb->ip_summed = CHECKSUM_NONE;

        /* update netdevice statistics */
        card->netdev->stats.rx_packets++;
        card->netdev->stats.rx_bytes += skb->len;

        /* pass skb up to stack */
        netif_receive_skb(skb);
}

/**
 * gelic_net_decode_one_descr - processes an rx descriptor
 * @card: card structure
 *
 * returns 1 if a packet has been sent to the stack, otherwise 0
 *
 * processes an rx descriptor by iommu-unmapping the data buffer and passing
 * the packet up to the stack
 */
static int gelic_net_decode_one_descr(struct gelic_net_card *card)
{
        enum gelic_net_descr_status status;
        struct gelic_net_descr_chain *chain = &card->rx_chain;
        struct gelic_net_descr *descr = chain->tail;
        int dmac_chain_ended;

        status = gelic_net_get_descr_status(descr);
        /* is this descriptor terminated with next_descr == NULL? */
        dmac_chain_ended =
                descr->dmac_cmd_status & GELIC_NET_DMAC_CMDSTAT_RXDCEIS;

        if (status == GELIC_NET_DESCR_CARDOWNED)
                return 0;

        if (status == GELIC_NET_DESCR_NOT_IN_USE) {
                dev_dbg(ctodev(card), "dormant descr? %p\n", descr);
                return 0;
        }

        if ((status == GELIC_NET_DESCR_RESPONSE_ERROR) ||
            (status == GELIC_NET_DESCR_PROTECTION_ERROR) ||
            (status == GELIC_NET_DESCR_FORCE_END)) {
                dev_info(ctodev(card), "dropping RX descriptor with state %x\n",
                         status);
                card->netdev->stats.rx_dropped++;
                goto refill;
        }

        if (status == GELIC_NET_DESCR_BUFFER_FULL) {
                /*
                 * Buffer full would occur if and only if
                 * the frame length was longer than the size of this
                 * descriptor's buffer.  If the frame length was equal
                 * to or shorter than buffer'size, FRAME_END condition
                 * would occur.
                 * Anyway this frame was longer than the MTU,
                 * just drop it.
                 */
                dev_info(ctodev(card), "overlength frame\n");
                goto refill;
        }
        /*
         * descriptoers any other than FRAME_END here should
         * be treated as error.
         */
        if (status != GELIC_NET_DESCR_FRAME_END) {
                dev_dbg(ctodev(card), "RX descriptor with state %x\n",
                        status);
                goto refill;
        }

        /* ok, we've got a packet in descr */
        gelic_net_pass_skb_up(descr, card);
refill:
        /*
         * So that always DMAC can see the end
         * of the descriptor chain to avoid
         * from unwanted DMAC overrun.
         */
        descr->next_descr_addr = 0;

        /* change the descriptor state: */
        gelic_net_set_descr_status(descr, GELIC_NET_DESCR_NOT_IN_USE);

        /*
         * this call can fail, but for now, just leave this
         * decriptor without skb
         */
        gelic_net_prepare_rx_descr(card, descr);

        chain->head = descr;
        chain->tail = descr->next;

        /*
         * Set this descriptor the end of the chain.
         */
        descr->prev->next_descr_addr = descr->bus_addr;

        /*
         * If dmac chain was met, DMAC stopped.
         * thus re-enable it
         */
        if (dmac_chain_ended) {
                card->rx_dma_restart_required = 1;
                dev_dbg(ctodev(card), "reenable rx dma scheduled\n");
        }

        return 1;
}

/**
 * gelic_net_poll - NAPI poll function called by the stack to return packets
 * @netdev: interface device structure
 * @budget: number of packets we can pass to the stack at most
 *
 * returns 0 if no more packets available to the driver/stack. Returns 1,
 * if the quota is exceeded, but the driver has still packets.
 *
 */
static int gelic_net_poll(struct napi_struct *napi, int budget)
{
        struct gelic_net_card *card = container_of(napi, struct gelic_net_card, napi);
        struct net_device *netdev = card->netdev;
        int packets_done = 0;

        while (packets_done < budget) {
                if (!gelic_net_decode_one_descr(card))
                        break;

                packets_done++;
        }

        if (packets_done < budget) {
                netif_rx_complete(netdev, napi);
                gelic_net_rx_irq_on(card);
        }
        return packets_done;
}
/**
 * gelic_net_change_mtu - changes the MTU of an interface
 * @netdev: interface device structure
 * @new_mtu: new MTU value
 *
 * returns 0 on success, <0 on failure
 */
static int gelic_net_change_mtu(struct net_device *netdev, int new_mtu)
{
        /* no need to re-alloc skbs or so -- the max mtu is about 2.3k
         * and mtu is outbound only anyway */
        if ((new_mtu < GELIC_NET_MIN_MTU) ||
            (new_mtu > GELIC_NET_MAX_MTU)) {
                return -EINVAL;
        }
        netdev->mtu = new_mtu;
        return 0;
}

/**
 * gelic_net_interrupt - event handler for gelic_net
 */
static irqreturn_t gelic_net_interrupt(int irq, void *ptr)
{
        unsigned long flags;
        struct net_device *netdev = ptr;
        struct gelic_net_card *card = netdev_priv(netdev);
        u64 status;

        status = card->irq_status;

        if (!status)
                return IRQ_NONE;

        if (card->rx_dma_restart_required) {
                card->rx_dma_restart_required = 0;
                gelic_net_enable_rxdmac(card);
        }

        if (status & GELIC_NET_RXINT) {
                gelic_net_rx_irq_off(card);
                netif_rx_schedule(netdev, &card->napi);
        }

        if (status & GELIC_NET_TXINT) {
                spin_lock_irqsave(&card->tx_dma_lock, flags);
                card->tx_dma_progress = 0;
                gelic_net_release_tx_chain(card, 0);
                /* kick outstanding tx descriptor if any */
                gelic_net_kick_txdma(card, card->tx_chain.tail);
                spin_unlock_irqrestore(&card->tx_dma_lock, flags);
        }
        return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/**
 * gelic_net_poll_controller - artificial interrupt for netconsole etc.
 * @netdev: interface device structure
 *
 * see Documentation/networking/netconsole.txt
 */
static void gelic_net_poll_controller(struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);

        gelic_net_set_irq_mask(card, 0);
        gelic_net_interrupt(netdev->irq, netdev);
        gelic_net_set_irq_mask(card, card->ghiintmask);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

/**
 * gelic_net_open_device - open device and map dma region
 * @card: card structure
 */
static int gelic_net_open_device(struct gelic_net_card *card)
{
        int result;

        result = ps3_sb_event_receive_port_setup(card->dev, PS3_BINDING_CPU_ANY,
                &card->netdev->irq);

        if (result) {
                dev_info(ctodev(card),
                         "%s:%d: gelic_net_open_device failed (%d)\n",
                         __func__, __LINE__, result);
                result = -EPERM;
                goto fail_alloc_irq;
        }

        result = request_irq(card->netdev->irq, gelic_net_interrupt,
                             IRQF_DISABLED, card->netdev->name, card->netdev);

        if (result) {
                dev_info(ctodev(card), "%s:%d: request_irq failed (%d)\n",
                        __func__, __LINE__, result);
                goto fail_request_irq;
        }

        return 0;

fail_request_irq:
        ps3_sb_event_receive_port_destroy(card->dev, card->netdev->irq);
        card->netdev->irq = NO_IRQ;
fail_alloc_irq:
        return result;
}


/**
 * gelic_net_open - called upon ifonfig up
 * @netdev: interface device structure
 *
 * returns 0 on success, <0 on failure
 *
 * gelic_net_open allocates all the descriptors and memory needed for
 * operation, sets up multicast list and enables interrupts
 */
static int gelic_net_open(struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);

        dev_dbg(ctodev(card), " -> %s:%d\n", __func__, __LINE__);

        gelic_net_open_device(card);

        if (gelic_net_init_chain(card, &card->tx_chain,
                        card->descr, GELIC_NET_TX_DESCRIPTORS))
                goto alloc_tx_failed;
        if (gelic_net_init_chain(card, &card->rx_chain,
                                 card->descr + GELIC_NET_TX_DESCRIPTORS,
                                 GELIC_NET_RX_DESCRIPTORS))
                goto alloc_rx_failed;

        /* head of chain */
        card->tx_top = card->tx_chain.head;
        card->rx_top = card->rx_chain.head;
        dev_dbg(ctodev(card), "descr rx %p, tx %p, size %#lx, num %#x\n",
                card->rx_top, card->tx_top, sizeof(struct gelic_net_descr),
                GELIC_NET_RX_DESCRIPTORS);
        /* allocate rx skbs */
        if (gelic_net_alloc_rx_skbs(card))
                goto alloc_skbs_failed;

        napi_enable(&card->napi);

        card->tx_dma_progress = 0;
        card->ghiintmask = GELIC_NET_RXINT | GELIC_NET_TXINT;

        gelic_net_set_irq_mask(card, card->ghiintmask);
        gelic_net_enable_rxdmac(card);

        netif_start_queue(netdev);
        netif_carrier_on(netdev);

        return 0;

alloc_skbs_failed:
        gelic_net_free_chain(card, card->rx_top);
alloc_rx_failed:
        gelic_net_free_chain(card, card->tx_top);
alloc_tx_failed:
        return -ENOMEM;
}

static void gelic_net_get_drvinfo (struct net_device *netdev,
                                   struct ethtool_drvinfo *info)
{
        strncpy(info->driver, DRV_NAME, sizeof(info->driver) - 1);
        strncpy(info->version, DRV_VERSION, sizeof(info->version) - 1);
}

static int gelic_net_get_settings(struct net_device *netdev,
                                  struct ethtool_cmd *cmd)
{
        struct gelic_net_card *card = netdev_priv(netdev);
        int status;
        u64 v1, v2;
        int speed, duplex;

        speed = duplex = -1;
        status = lv1_net_control(bus_id(card), dev_id(card),
                        GELIC_NET_GET_ETH_PORT_STATUS, GELIC_NET_PORT, 0, 0,
                        &v1, &v2);
        if (status) {
                /* link down */
        } else {
                if (v1 & GELIC_NET_FULL_DUPLEX) {
                        duplex = DUPLEX_FULL;
                } else {
                        duplex = DUPLEX_HALF;
                }

                if (v1 & GELIC_NET_SPEED_10 ) {
                        speed = SPEED_10;
                } else if (v1 & GELIC_NET_SPEED_100) {
                        speed = SPEED_100;
                } else if (v1 & GELIC_NET_SPEED_1000) {
                        speed = SPEED_1000;
                }
        }
        cmd->supported = SUPPORTED_TP | SUPPORTED_Autoneg |
                        SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
                        SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
                        SUPPORTED_1000baseT_Half | SUPPORTED_1000baseT_Full;
        cmd->advertising = cmd->supported;
        cmd->speed = speed;
        cmd->duplex = duplex;
        cmd->autoneg = AUTONEG_ENABLE; /* always enabled */
        cmd->port = PORT_TP;

        return 0;
}

static u32 gelic_net_get_link(struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);
        int status;
        u64 v1, v2;
        int link;

        status = lv1_net_control(bus_id(card), dev_id(card),
                        GELIC_NET_GET_ETH_PORT_STATUS, GELIC_NET_PORT, 0, 0,
                        &v1, &v2);
        if (status)
                return 0; /* link down */

        if (v1 & GELIC_NET_LINK_UP)
                link = 1;
        else
                link = 0;

        return link;
}

static int gelic_net_nway_reset(struct net_device *netdev)
{
        if (netif_running(netdev)) {
                gelic_net_stop(netdev);
                gelic_net_open(netdev);
        }
        return 0;
}

static u32 gelic_net_get_tx_csum(struct net_device *netdev)
{
        return (netdev->features & NETIF_F_IP_CSUM) != 0;
}

static int gelic_net_set_tx_csum(struct net_device *netdev, u32 data)
{
        if (data)
                netdev->features |= NETIF_F_IP_CSUM;
        else
                netdev->features &= ~NETIF_F_IP_CSUM;

        return 0;
}

static u32 gelic_net_get_rx_csum(struct net_device *netdev)
{
        struct gelic_net_card *card = netdev_priv(netdev);

        return card->rx_csum;
}

static int gelic_net_set_rx_csum(struct net_device *netdev, u32 data)
{
        struct gelic_net_card *card = netdev_priv(netdev);

        card->rx_csum = data;
        return 0;
}

static struct ethtool_ops gelic_net_ethtool_ops = {
        .get_drvinfo    = gelic_net_get_drvinfo,
        .get_settings   = gelic_net_get_settings,
        .get_link       = gelic_net_get_link,
        .nway_reset     = gelic_net_nway_reset,
        .get_tx_csum    = gelic_net_get_tx_csum,
        .set_tx_csum    = gelic_net_set_tx_csum,
        .get_rx_csum    = gelic_net_get_rx_csum,
        .set_rx_csum    = gelic_net_set_rx_csum,
};

/**
 * gelic_net_tx_timeout_task - task scheduled by the watchdog timeout
 * function (to be called not under interrupt status)
 * @work: work is context of tx timout task
 *
 * called as task when tx hangs, resets interface (if interface is up)
 */
static void gelic_net_tx_timeout_task(struct work_struct *work)
{
        struct gelic_net_card *card =
                container_of(work, struct gelic_net_card, tx_timeout_task);
        struct net_device *netdev = card->netdev;

        dev_info(ctodev(card), "%s:Timed out. Restarting... \n", __func__);

        if (!(netdev->flags & IFF_UP))
                goto out;

        netif_device_detach(netdev);
        gelic_net_stop(netdev);

        gelic_net_open(netdev);
        netif_device_attach(netdev);

out:
        atomic_dec(&card->tx_timeout_task_counter);
}

/**
 * gelic_net_tx_timeout - called when the tx timeout watchdog kicks in.
 * @netdev: interface device structure
 *
 * called, if tx hangs. Schedules a task that resets the interface
 */
static void gelic_net_tx_timeout(struct net_device *netdev)
{
        struct gelic_net_card *card;

        card = netdev_priv(netdev);
        atomic_inc(&card->tx_timeout_task_counter);
        if (netdev->flags & IFF_UP)
                schedule_work(&card->tx_timeout_task);
        else
                atomic_dec(&card->tx_timeout_task_counter);
}

/**
 * gelic_net_setup_netdev_ops - initialization of net_device operations
 * @netdev: net_device structure
 *
 * fills out function pointers in the net_device structure
 */
static void gelic_net_setup_netdev_ops(struct net_device *netdev)
{
        netdev->open = &gelic_net_open;
        netdev->stop = &gelic_net_stop;
        netdev->hard_start_xmit = &gelic_net_xmit;
        netdev->set_multicast_list = &gelic_net_set_multi;
        netdev->change_mtu = &gelic_net_change_mtu;
        /* tx watchdog */
        netdev->tx_timeout = &gelic_net_tx_timeout;
        netdev->watchdog_timeo = GELIC_NET_WATCHDOG_TIMEOUT;
        netdev->ethtool_ops = &gelic_net_ethtool_ops;
}

/**
 * gelic_net_setup_netdev - initialization of net_device
 * @card: card structure
 *
 * Returns 0 on success or <0 on failure
 *
 * gelic_net_setup_netdev initializes the net_device structure
 **/
static int gelic_net_setup_netdev(struct gelic_net_card *card)
{
        struct net_device *netdev = card->netdev;
        struct sockaddr addr;
        unsigned int i;
        int status;
        u64 v1, v2;
        DECLARE_MAC_BUF(mac);

        SET_NETDEV_DEV(netdev, &card->dev->core);
        spin_lock_init(&card->tx_dma_lock);

        card->rx_csum = GELIC_NET_RX_CSUM_DEFAULT;

        gelic_net_setup_netdev_ops(netdev);

        netif_napi_add(netdev, &card->napi,
                       gelic_net_poll, GELIC_NET_NAPI_WEIGHT);

        netdev->features = NETIF_F_IP_CSUM;

        status = lv1_net_control(bus_id(card), dev_id(card),
                                 GELIC_NET_GET_MAC_ADDRESS,
                                 0, 0, 0, &v1, &v2);
        if (status || !is_valid_ether_addr((u8 *)&v1)) {
                dev_info(ctodev(card),
                         "%s:lv1_net_control GET_MAC_ADDR failed %d\n",
                         __func__, status);
                return -EINVAL;
        }
        v1 <<= 16;
        memcpy(addr.sa_data, &v1, ETH_ALEN);
        memcpy(netdev->dev_addr, addr.sa_data, ETH_ALEN);
        dev_info(ctodev(card), "MAC addr %s\n",
                 print_mac(mac, netdev->dev_addr));

        card->vlan_index = -1;  /* no vlan */
        for (i = 0; i < GELIC_NET_VLAN_MAX; i++) {
                status = lv1_net_control(bus_id(card), dev_id(card),
                                        GELIC_NET_GET_VLAN_ID,
                                        i + 1, /* index; one based */
                                        0, 0, &v1, &v2);
                if (status == GELIC_NET_VLAN_NO_ENTRY) {
                        dev_dbg(ctodev(card),
                                "GELIC_VLAN_ID no entry:%d, VLAN disabled\n",
                                status);
                        card->vlan_id[i] = 0;
                } else if (status) {
                        dev_dbg(ctodev(card),
                                "%s:GELIC_NET_VLAN_ID faild, status=%d\n",
                                __func__, status);
                        card->vlan_id[i] = 0;
                } else {
                        card->vlan_id[i] = (u32)v1;
                        dev_dbg(ctodev(card), "vlan_id:%d, %lx\n", i, v1);
                }
        }

        if (card->vlan_id[GELIC_NET_VLAN_WIRED - 1]) {
                card->vlan_index = GELIC_NET_VLAN_WIRED - 1;
                netdev->hard_header_len += VLAN_HLEN;
        }

        status = register_netdev(netdev);
        if (status) {
                dev_err(ctodev(card), "%s:Couldn't register net_device: %d\n",
                        __func__, status);
                return status;
        }

        return 0;
}

/**
 * gelic_net_alloc_card - allocates net_device and card structure
 *
 * returns the card structure or NULL in case of errors
 *
 * the card and net_device structures are linked to each other
 */
static struct gelic_net_card *gelic_net_alloc_card(void)
{
        struct net_device *netdev;
        struct gelic_net_card *card;
        size_t alloc_size;

        alloc_size = sizeof (*card) +
                sizeof (struct gelic_net_descr) * GELIC_NET_RX_DESCRIPTORS +
                sizeof (struct gelic_net_descr) * GELIC_NET_TX_DESCRIPTORS;
        /*
         * we assume private data is allocated 32 bytes (or more) aligned
         * so that gelic_net_descr should be 32 bytes aligned.
         * Current alloc_etherdev() does do it because NETDEV_ALIGN
         * is 32.
         * check this assumption here.
         */
        BUILD_BUG_ON(NETDEV_ALIGN < 32);
        BUILD_BUG_ON(offsetof(struct gelic_net_card, irq_status) % 8);
        BUILD_BUG_ON(offsetof(struct gelic_net_card, descr) % 32);

        netdev = alloc_etherdev(alloc_size);
        if (!netdev)
                return NULL;

        card = netdev_priv(netdev);
        card->netdev = netdev;
        INIT_WORK(&card->tx_timeout_task, gelic_net_tx_timeout_task);
        init_waitqueue_head(&card->waitq);
        atomic_set(&card->tx_timeout_task_counter, 0);

        return card;
}

/**
 * ps3_gelic_driver_probe - add a device to the control of this driver
 */
static int ps3_gelic_driver_probe (struct ps3_system_bus_device *dev)
{
        struct gelic_net_card *card = gelic_net_alloc_card();
        int result;

        if (!card) {
                dev_info(&dev->core, "gelic_net_alloc_card failed\n");
                result = -ENOMEM;
                goto fail_alloc_card;
        }

        ps3_system_bus_set_driver_data(dev, card);
        card->dev = dev;

        result = ps3_open_hv_device(dev);

        if (result) {
                dev_dbg(&dev->core, "ps3_open_hv_device failed\n");
                goto fail_open;
        }

        result = ps3_dma_region_create(dev->d_region);

        if (result) {
                dev_dbg(&dev->core, "ps3_dma_region_create failed(%d)\n",
                        result);
                BUG_ON("check region type");
                goto fail_dma_region;
        }

        result = lv1_net_set_interrupt_status_indicator(bus_id(card),
                                                        dev_id(card),
                ps3_mm_phys_to_lpar(__pa(&card->irq_status)),
                0);

        if (result) {
                dev_dbg(&dev->core,
                        "lv1_net_set_interrupt_status_indicator failed: %s\n",
                        ps3_result(result));
                result = -EIO;
                goto fail_status_indicator;
        }

        result = gelic_net_setup_netdev(card);

        if (result) {
                dev_dbg(&dev->core, "%s:%d: ps3_dma_region_create failed: "
                        "(%d)\n", __func__, __LINE__, result);
                goto fail_setup_netdev;
        }

        return 0;

fail_setup_netdev:
        lv1_net_set_interrupt_status_indicator(bus_id(card),
                                               bus_id(card),
                                               0 , 0);
fail_status_indicator:
        ps3_dma_region_free(dev->d_region);
fail_dma_region:
        ps3_close_hv_device(dev);
fail_open:
        ps3_system_bus_set_driver_data(dev, NULL);
        free_netdev(card->netdev);
fail_alloc_card:
        return result;
}

/**
 * ps3_gelic_driver_remove - remove a device from the control of this driver
 */

static int ps3_gelic_driver_remove (struct ps3_system_bus_device *dev)
{
        struct gelic_net_card *card = ps3_system_bus_get_driver_data(dev);

        wait_event(card->waitq,
                   atomic_read(&card->tx_timeout_task_counter) == 0);

        lv1_net_set_interrupt_status_indicator(bus_id(card), dev_id(card),
                                               0 , 0);

        unregister_netdev(card->netdev);
        free_netdev(card->netdev);

        ps3_system_bus_set_driver_data(dev, NULL);

        ps3_dma_region_free(dev->d_region);

        ps3_close_hv_device(dev);

        return 0;
}

static struct ps3_system_bus_driver ps3_gelic_driver = {
        .match_id = PS3_MATCH_ID_GELIC,
        .probe = ps3_gelic_driver_probe,
        .remove = ps3_gelic_driver_remove,
        .shutdown = ps3_gelic_driver_remove,
        .core.name = "ps3_gelic_driver",
        .core.owner = THIS_MODULE,
};

static int __init ps3_gelic_driver_init (void)
{
        return firmware_has_feature(FW_FEATURE_PS3_LV1)
                ? ps3_system_bus_driver_register(&ps3_gelic_driver)
                : -ENODEV;
}

static void __exit ps3_gelic_driver_exit (void)
{
        ps3_system_bus_driver_unregister(&ps3_gelic_driver);
}

module_init (ps3_gelic_driver_init);
module_exit (ps3_gelic_driver_exit);

MODULE_ALIAS(PS3_MODULE_ALIAS_GELIC);