// SPDX-License-Identifier: GPL-2.0
/* sunhme.c: Sparc HME/BigMac 10/100baseT half/full duplex auto switching,
 *           auto carrier detecting ethernet driver.  Also known as the
 *           "Happy Meal Ethernet" found on SunSwift SBUS cards.
 *
 * Copyright (C) 1996, 1998, 1999, 2002, 2003,
 *              2006, 2008 David S. Miller (davem@davemloft.net)
 *
 * Changes :
 * 2000/11/11 Willy Tarreau <willy AT meta-x.org>
 *   - port to non-sparc architectures. Tested only on x86 and
 *     only currently works with QFE PCI cards.
 *   - ability to specify the MAC address at module load time by passing this
 *     argument : macaddr=0x00,0x10,0x20,0x30,0x40,0x50
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/crc32.h>
#include <linux/random.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/mm.h>
#include <linux/bitops.h>
#include <linux/dma-mapping.h>

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

#ifdef CONFIG_SPARC
#include <linux/of.h>
#include <linux/of_device.h>
#include <asm/idprom.h>
#include <asm/openprom.h>
#include <asm/oplib.h>
#include <asm/prom.h>
#include <asm/auxio.h>
#endif
#include <linux/uaccess.h>

#include <asm/pgtable.h>
#include <asm/irq.h>

#ifdef CONFIG_PCI
#include <linux/pci.h>
#endif

#include "sunhme.h"

#define DRV_NAME        "sunhme"
#define DRV_VERSION     "3.10"
#define DRV_RELDATE     "August 26, 2008"
#define DRV_AUTHOR      "David S. Miller (davem@davemloft.net)"

static char version[] =
        DRV_NAME ".c:v" DRV_VERSION " " DRV_RELDATE " " DRV_AUTHOR "\n";

MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR(DRV_AUTHOR);
MODULE_DESCRIPTION("Sun HappyMealEthernet(HME) 10/100baseT ethernet driver");
MODULE_LICENSE("GPL");

static int macaddr[6];

/* accept MAC address of the form macaddr=0x08,0x00,0x20,0x30,0x40,0x50 */
module_param_array(macaddr, int, NULL, 0);
MODULE_PARM_DESC(macaddr, "Happy Meal MAC address to set");

#ifdef CONFIG_SBUS
static struct quattro *qfe_sbus_list;
#endif

#ifdef CONFIG_PCI
static struct quattro *qfe_pci_list;
#endif

#undef HMEDEBUG
#undef SXDEBUG
#undef RXDEBUG
#undef TXDEBUG
#undef TXLOGGING

#ifdef TXLOGGING
struct hme_tx_logent {
        unsigned int tstamp;
        int tx_new, tx_old;
        unsigned int action;
#define TXLOG_ACTION_IRQ        0x01
#define TXLOG_ACTION_TXMIT      0x02
#define TXLOG_ACTION_TBUSY      0x04
#define TXLOG_ACTION_NBUFS      0x08
        unsigned int status;
};
#define TX_LOG_LEN      128
static struct hme_tx_logent tx_log[TX_LOG_LEN];
static int txlog_cur_entry;
static __inline__ void tx_add_log(struct happy_meal *hp, unsigned int a, unsigned int s)
{
        struct hme_tx_logent *tlp;
        unsigned long flags;

        local_irq_save(flags);
        tlp = &tx_log[txlog_cur_entry];
        tlp->tstamp = (unsigned int)jiffies;
        tlp->tx_new = hp->tx_new;
        tlp->tx_old = hp->tx_old;
        tlp->action = a;
        tlp->status = s;
        txlog_cur_entry = (txlog_cur_entry + 1) & (TX_LOG_LEN - 1);
        local_irq_restore(flags);
}
static __inline__ void tx_dump_log(void)
{
        int i, this;

        this = txlog_cur_entry;
        for (i = 0; i < TX_LOG_LEN; i++) {
                printk("TXLOG[%d]: j[%08x] tx[N(%d)O(%d)] action[%08x] stat[%08x]\n", i,
                       tx_log[this].tstamp,
                       tx_log[this].tx_new, tx_log[this].tx_old,
                       tx_log[this].action, tx_log[this].status);
                this = (this + 1) & (TX_LOG_LEN - 1);
        }
}
static __inline__ void tx_dump_ring(struct happy_meal *hp)
{
        struct hmeal_init_block *hb = hp->happy_block;
        struct happy_meal_txd *tp = &hb->happy_meal_txd[0];
        int i;

        for (i = 0; i < TX_RING_SIZE; i+=4) {
                printk("TXD[%d..%d]: [%08x:%08x] [%08x:%08x] [%08x:%08x] [%08x:%08x]\n",
                       i, i + 4,
                       le32_to_cpu(tp[i].tx_flags), le32_to_cpu(tp[i].tx_addr),
                       le32_to_cpu(tp[i + 1].tx_flags), le32_to_cpu(tp[i + 1].tx_addr),
                       le32_to_cpu(tp[i + 2].tx_flags), le32_to_cpu(tp[i + 2].tx_addr),
                       le32_to_cpu(tp[i + 3].tx_flags), le32_to_cpu(tp[i + 3].tx_addr));
        }
}
#else
#define tx_add_log(hp, a, s)            do { } while(0)
#define tx_dump_log()                   do { } while(0)
#define tx_dump_ring(hp)                do { } while(0)
#endif

#ifdef HMEDEBUG
#define HMD(x)  printk x
#else
#define HMD(x)
#endif

/* #define AUTO_SWITCH_DEBUG */

#ifdef AUTO_SWITCH_DEBUG
#define ASD(x)  printk x
#else
#define ASD(x)
#endif

#define DEFAULT_IPG0      16 /* For lance-mode only */
#define DEFAULT_IPG1       8 /* For all modes */
#define DEFAULT_IPG2       4 /* For all modes */
#define DEFAULT_JAMSIZE    4 /* Toe jam */

/* NOTE: In the descriptor writes one _must_ write the address
 *       member _first_.  The card must not be allowed to see
 *       the updated descriptor flags until the address is
 *       correct.  I've added a write memory barrier between
 *       the two stores so that I can sleep well at night... -DaveM
 */

#if defined(CONFIG_SBUS) && defined(CONFIG_PCI)
static void sbus_hme_write32(void __iomem *reg, u32 val)
{
        sbus_writel(val, reg);
}

static u32 sbus_hme_read32(void __iomem *reg)
{
        return sbus_readl(reg);
}

static void sbus_hme_write_rxd(struct happy_meal_rxd *rxd, u32 flags, u32 addr)
{
        rxd->rx_addr = (__force hme32)addr;
        dma_wmb();
        rxd->rx_flags = (__force hme32)flags;
}

static void sbus_hme_write_txd(struct happy_meal_txd *txd, u32 flags, u32 addr)
{
        txd->tx_addr = (__force hme32)addr;
        dma_wmb();
        txd->tx_flags = (__force hme32)flags;
}

static u32 sbus_hme_read_desc32(hme32 *p)
{
        return (__force u32)*p;
}

static void pci_hme_write32(void __iomem *reg, u32 val)
{
        writel(val, reg);
}

static u32 pci_hme_read32(void __iomem *reg)
{
        return readl(reg);
}

static void pci_hme_write_rxd(struct happy_meal_rxd *rxd, u32 flags, u32 addr)
{
        rxd->rx_addr = (__force hme32)cpu_to_le32(addr);
        dma_wmb();
        rxd->rx_flags = (__force hme32)cpu_to_le32(flags);
}

static void pci_hme_write_txd(struct happy_meal_txd *txd, u32 flags, u32 addr)
{
        txd->tx_addr = (__force hme32)cpu_to_le32(addr);
        dma_wmb();
        txd->tx_flags = (__force hme32)cpu_to_le32(flags);
}

static u32 pci_hme_read_desc32(hme32 *p)
{
        return le32_to_cpup((__le32 *)p);
}

#define hme_write32(__hp, __reg, __val) \
        ((__hp)->write32((__reg), (__val)))
#define hme_read32(__hp, __reg) \
        ((__hp)->read32(__reg))
#define hme_write_rxd(__hp, __rxd, __flags, __addr) \
        ((__hp)->write_rxd((__rxd), (__flags), (__addr)))
#define hme_write_txd(__hp, __txd, __flags, __addr) \
        ((__hp)->write_txd((__txd), (__flags), (__addr)))
#define hme_read_desc32(__hp, __p) \
        ((__hp)->read_desc32(__p))
#define hme_dma_map(__hp, __ptr, __size, __dir) \
        ((__hp)->dma_map((__hp)->dma_dev, (__ptr), (__size), (__dir)))
#define hme_dma_unmap(__hp, __addr, __size, __dir) \
        ((__hp)->dma_unmap((__hp)->dma_dev, (__addr), (__size), (__dir)))
#define hme_dma_sync_for_cpu(__hp, __addr, __size, __dir) \
        ((__hp)->dma_sync_for_cpu((__hp)->dma_dev, (__addr), (__size), (__dir)))
#define hme_dma_sync_for_device(__hp, __addr, __size, __dir) \
        ((__hp)->dma_sync_for_device((__hp)->dma_dev, (__addr), (__size), (__dir)))
#else
#ifdef CONFIG_SBUS
/* SBUS only compilation */
#define hme_write32(__hp, __reg, __val) \
        sbus_writel((__val), (__reg))
#define hme_read32(__hp, __reg) \
        sbus_readl(__reg)
#define hme_write_rxd(__hp, __rxd, __flags, __addr) \
do {    (__rxd)->rx_addr = (__force hme32)(u32)(__addr); \
        dma_wmb(); \
        (__rxd)->rx_flags = (__force hme32)(u32)(__flags); \
} while(0)
#define hme_write_txd(__hp, __txd, __flags, __addr) \
do {    (__txd)->tx_addr = (__force hme32)(u32)(__addr); \
        dma_wmb(); \
        (__txd)->tx_flags = (__force hme32)(u32)(__flags); \
} while(0)
#define hme_read_desc32(__hp, __p)      ((__force u32)(hme32)*(__p))
#define hme_dma_map(__hp, __ptr, __size, __dir) \
        dma_map_single((__hp)->dma_dev, (__ptr), (__size), (__dir))
#define hme_dma_unmap(__hp, __addr, __size, __dir) \
        dma_unmap_single((__hp)->dma_dev, (__addr), (__size), (__dir))
#define hme_dma_sync_for_cpu(__hp, __addr, __size, __dir) \
        dma_dma_sync_single_for_cpu((__hp)->dma_dev, (__addr), (__size), (__dir))
#define hme_dma_sync_for_device(__hp, __addr, __size, __dir) \
        dma_dma_sync_single_for_device((__hp)->dma_dev, (__addr), (__size), (__dir))
#else
/* PCI only compilation */
#define hme_write32(__hp, __reg, __val) \
        writel((__val), (__reg))
#define hme_read32(__hp, __reg) \
        readl(__reg)
#define hme_write_rxd(__hp, __rxd, __flags, __addr) \
do {    (__rxd)->rx_addr = (__force hme32)cpu_to_le32(__addr); \
        dma_wmb(); \
        (__rxd)->rx_flags = (__force hme32)cpu_to_le32(__flags); \
} while(0)
#define hme_write_txd(__hp, __txd, __flags, __addr) \
do {    (__txd)->tx_addr = (__force hme32)cpu_to_le32(__addr); \
        dma_wmb(); \
        (__txd)->tx_flags = (__force hme32)cpu_to_le32(__flags); \
} while(0)
static inline u32 hme_read_desc32(struct happy_meal *hp, hme32 *p)
{
        return le32_to_cpup((__le32 *)p);
}
#define hme_dma_map(__hp, __ptr, __size, __dir) \
        pci_map_single((__hp)->dma_dev, (__ptr), (__size), (__dir))
#define hme_dma_unmap(__hp, __addr, __size, __dir) \
        pci_unmap_single((__hp)->dma_dev, (__addr), (__size), (__dir))
#define hme_dma_sync_for_cpu(__hp, __addr, __size, __dir) \
        pci_dma_sync_single_for_cpu((__hp)->dma_dev, (__addr), (__size), (__dir))
#define hme_dma_sync_for_device(__hp, __addr, __size, __dir) \
        pci_dma_sync_single_for_device((__hp)->dma_dev, (__addr), (__size), (__dir))
#endif
#endif


/* Oh yes, the MIF BitBang is mighty fun to program.  BitBucket is more like it. */
static void BB_PUT_BIT(struct happy_meal *hp, void __iomem *tregs, int bit)
{
        hme_write32(hp, tregs + TCVR_BBDATA, bit);
        hme_write32(hp, tregs + TCVR_BBCLOCK, 0);
        hme_write32(hp, tregs + TCVR_BBCLOCK, 1);
}

#if 0
static u32 BB_GET_BIT(struct happy_meal *hp, void __iomem *tregs, int internal)
{
        u32 ret;

        hme_write32(hp, tregs + TCVR_BBCLOCK, 0);
        hme_write32(hp, tregs + TCVR_BBCLOCK, 1);
        ret = hme_read32(hp, tregs + TCVR_CFG);
        if (internal)
                ret &= TCV_CFG_MDIO0;
        else
                ret &= TCV_CFG_MDIO1;

        return ret;
}
#endif

static u32 BB_GET_BIT2(struct happy_meal *hp, void __iomem *tregs, int internal)
{
        u32 retval;

        hme_write32(hp, tregs + TCVR_BBCLOCK, 0);
        udelay(1);
        retval = hme_read32(hp, tregs + TCVR_CFG);
        if (internal)
                retval &= TCV_CFG_MDIO0;
        else
                retval &= TCV_CFG_MDIO1;
        hme_write32(hp, tregs + TCVR_BBCLOCK, 1);

        return retval;
}

#define TCVR_FAILURE      0x80000000     /* Impossible MIF read value */

static int happy_meal_bb_read(struct happy_meal *hp,
                              void __iomem *tregs, int reg)
{
        u32 tmp;
        int retval = 0;
        int i;

        ASD(("happy_meal_bb_read: reg=%d ", reg));

        /* Enable the MIF BitBang outputs. */
        hme_write32(hp, tregs + TCVR_BBOENAB, 1);

        /* Force BitBang into the idle state. */
        for (i = 0; i < 32; i++)
                BB_PUT_BIT(hp, tregs, 1);

        /* Give it the read sequence. */
        BB_PUT_BIT(hp, tregs, 0);
        BB_PUT_BIT(hp, tregs, 1);
        BB_PUT_BIT(hp, tregs, 1);
        BB_PUT_BIT(hp, tregs, 0);

        /* Give it the PHY address. */
        tmp = hp->paddr & 0xff;
        for (i = 4; i >= 0; i--)
                BB_PUT_BIT(hp, tregs, ((tmp >> i) & 1));

        /* Tell it what register we want to read. */
        tmp = (reg & 0xff);
        for (i = 4; i >= 0; i--)
                BB_PUT_BIT(hp, tregs, ((tmp >> i) & 1));

        /* Close down the MIF BitBang outputs. */
        hme_write32(hp, tregs + TCVR_BBOENAB, 0);

        /* Now read in the value. */
        (void) BB_GET_BIT2(hp, tregs, (hp->tcvr_type == internal));
        for (i = 15; i >= 0; i--)
                retval |= BB_GET_BIT2(hp, tregs, (hp->tcvr_type == internal));
        (void) BB_GET_BIT2(hp, tregs, (hp->tcvr_type == internal));
        (void) BB_GET_BIT2(hp, tregs, (hp->tcvr_type == internal));
        (void) BB_GET_BIT2(hp, tregs, (hp->tcvr_type == internal));
        ASD(("value=%x\n", retval));
        return retval;
}

static void happy_meal_bb_write(struct happy_meal *hp,
                                void __iomem *tregs, int reg,
                                unsigned short value)
{
        u32 tmp;
        int i;

        ASD(("happy_meal_bb_write: reg=%d value=%x\n", reg, value));

        /* Enable the MIF BitBang outputs. */
        hme_write32(hp, tregs + TCVR_BBOENAB, 1);

        /* Force BitBang into the idle state. */
        for (i = 0; i < 32; i++)
                BB_PUT_BIT(hp, tregs, 1);

        /* Give it write sequence. */
        BB_PUT_BIT(hp, tregs, 0);
        BB_PUT_BIT(hp, tregs, 1);
        BB_PUT_BIT(hp, tregs, 0);
        BB_PUT_BIT(hp, tregs, 1);

        /* Give it the PHY address. */
        tmp = (hp->paddr & 0xff);
        for (i = 4; i >= 0; i--)
                BB_PUT_BIT(hp, tregs, ((tmp >> i) & 1));

        /* Tell it what register we will be writing. */
        tmp = (reg & 0xff);
        for (i = 4; i >= 0; i--)
                BB_PUT_BIT(hp, tregs, ((tmp >> i) & 1));

        /* Tell it to become ready for the bits. */
        BB_PUT_BIT(hp, tregs, 1);
        BB_PUT_BIT(hp, tregs, 0);

        for (i = 15; i >= 0; i--)
                BB_PUT_BIT(hp, tregs, ((value >> i) & 1));

        /* Close down the MIF BitBang outputs. */
        hme_write32(hp, tregs + TCVR_BBOENAB, 0);
}

#define TCVR_READ_TRIES   16

static int happy_meal_tcvr_read(struct happy_meal *hp,
                                void __iomem *tregs, int reg)
{
        int tries = TCVR_READ_TRIES;
        int retval;

        ASD(("happy_meal_tcvr_read: reg=0x%02x ", reg));
        if (hp->tcvr_type == none) {
                ASD(("no transceiver, value=TCVR_FAILURE\n"));
                return TCVR_FAILURE;
        }

        if (!(hp->happy_flags & HFLAG_FENABLE)) {
                ASD(("doing bit bang\n"));
                return happy_meal_bb_read(hp, tregs, reg);
        }

        hme_write32(hp, tregs + TCVR_FRAME,
                    (FRAME_READ | (hp->paddr << 23) | ((reg & 0xff) << 18)));
        while (!(hme_read32(hp, tregs + TCVR_FRAME) & 0x10000) && --tries)
                udelay(20);
        if (!tries) {
                printk(KERN_ERR "happy meal: Aieee, transceiver MIF read bolixed\n");
                return TCVR_FAILURE;
        }
        retval = hme_read32(hp, tregs + TCVR_FRAME) & 0xffff;
        ASD(("value=%04x\n", retval));
        return retval;
}

#define TCVR_WRITE_TRIES  16

static void happy_meal_tcvr_write(struct happy_meal *hp,
                                  void __iomem *tregs, int reg,
                                  unsigned short value)
{
        int tries = TCVR_WRITE_TRIES;

        ASD(("happy_meal_tcvr_write: reg=0x%02x value=%04x\n", reg, value));

        /* Welcome to Sun Microsystems, can I take your order please? */
        if (!(hp->happy_flags & HFLAG_FENABLE)) {
                happy_meal_bb_write(hp, tregs, reg, value);
                return;
        }

        /* Would you like fries with that? */
        hme_write32(hp, tregs + TCVR_FRAME,
                    (FRAME_WRITE | (hp->paddr << 23) |
                     ((reg & 0xff) << 18) | (value & 0xffff)));
        while (!(hme_read32(hp, tregs + TCVR_FRAME) & 0x10000) && --tries)
                udelay(20);

        /* Anything else? */
        if (!tries)
                printk(KERN_ERR "happy meal: Aieee, transceiver MIF write bolixed\n");

        /* Fifty-two cents is your change, have a nice day. */
}

/* Auto negotiation.  The scheme is very simple.  We have a timer routine
 * that keeps watching the auto negotiation process as it progresses.
 * The DP83840 is first told to start doing it's thing, we set up the time
 * and place the timer state machine in it's initial state.
 *
 * Here the timer peeks at the DP83840 status registers at each click to see
 * if the auto negotiation has completed, we assume here that the DP83840 PHY
 * will time out at some point and just tell us what (didn't) happen.  For
 * complete coverage we only allow so many of the ticks at this level to run,
 * when this has expired we print a warning message and try another strategy.
 * This "other" strategy is to force the interface into various speed/duplex
 * configurations and we stop when we see a link-up condition before the
 * maximum number of "peek" ticks have occurred.
 *
 * Once a valid link status has been detected we configure the BigMAC and
 * the rest of the Happy Meal to speak the most efficient protocol we could
 * get a clean link for.  The priority for link configurations, highest first
 * is:
 *                 100 Base-T Full Duplex
 *                 100 Base-T Half Duplex
 *                 10 Base-T Full Duplex
 *                 10 Base-T Half Duplex
 *
 * We start a new timer now, after a successful auto negotiation status has
 * been detected.  This timer just waits for the link-up bit to get set in
 * the BMCR of the DP83840.  When this occurs we print a kernel log message
 * describing the link type in use and the fact that it is up.
 *
 * If a fatal error of some sort is signalled and detected in the interrupt
 * service routine, and the chip is reset, or the link is ifconfig'd down
 * and then back up, this entire process repeats itself all over again.
 */
static int try_next_permutation(struct happy_meal *hp, void __iomem *tregs)
{
        hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);

        /* Downgrade from full to half duplex.  Only possible
         * via ethtool.
         */
        if (hp->sw_bmcr & BMCR_FULLDPLX) {
                hp->sw_bmcr &= ~(BMCR_FULLDPLX);
                happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
                return 0;
        }

        /* Downgrade from 100 to 10. */
        if (hp->sw_bmcr & BMCR_SPEED100) {
                hp->sw_bmcr &= ~(BMCR_SPEED100);
                happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);
                return 0;
        }

        /* We've tried everything. */
        return -1;
}

static void display_link_mode(struct happy_meal *hp, void __iomem *tregs)
{
        printk(KERN_INFO "%s: Link is up using ", hp->dev->name);
        if (hp->tcvr_type == external)
                printk("external ");
        else
                printk("internal ");
        printk("transceiver at ");
        hp->sw_lpa = happy_meal_tcvr_read(hp, tregs, MII_LPA);
        if (hp->sw_lpa & (LPA_100HALF | LPA_100FULL)) {
                if (hp->sw_lpa & LPA_100FULL)
                        printk("100Mb/s, Full Duplex.\n");
                else
                        printk("100Mb/s, Half Duplex.\n");
        } else {
                if (hp->sw_lpa & LPA_10FULL)
                        printk("10Mb/s, Full Duplex.\n");
                else
                        printk("10Mb/s, Half Duplex.\n");
        }
}

static void display_forced_link_mode(struct happy_meal *hp, void __iomem *tregs)
{
        printk(KERN_INFO "%s: Link has been forced up using ", hp->dev->name);
        if (hp->tcvr_type == external)
                printk("external ");
        else
                printk("internal ");
        printk("transceiver at ");
        hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
        if (hp->sw_bmcr & BMCR_SPEED100)
                printk("100Mb/s, ");
        else
                printk("10Mb/s, ");
        if (hp->sw_bmcr & BMCR_FULLDPLX)
                printk("Full Duplex.\n");
        else
                printk("Half Duplex.\n");
}

static int set_happy_link_modes(struct happy_meal *hp, void __iomem *tregs)
{
        int full;

        /* All we care about is making sure the bigmac tx_cfg has a
         * proper duplex setting.
         */
        if (hp->timer_state == arbwait) {
                hp->sw_lpa = happy_meal_tcvr_read(hp, tregs, MII_LPA);
                if (!(hp->sw_lpa & (LPA_10HALF | LPA_10FULL | LPA_100HALF | LPA_100FULL)))
                        goto no_response;
                if (hp->sw_lpa & LPA_100FULL)
                        full = 1;
                else if (hp->sw_lpa & LPA_100HALF)
                        full = 0;
                else if (hp->sw_lpa & LPA_10FULL)
                        full = 1;
                else
                        full = 0;
        } else {
                /* Forcing a link mode. */
                hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                if (hp->sw_bmcr & BMCR_FULLDPLX)
                        full = 1;
                else
                        full = 0;
        }

        /* Before changing other bits in the tx_cfg register, and in
         * general any of other the TX config registers too, you
         * must:
         * 1) Clear Enable
         * 2) Poll with reads until that bit reads back as zero
         * 3) Make TX configuration changes
         * 4) Set Enable once more
         */
        hme_write32(hp, hp->bigmacregs + BMAC_TXCFG,
                    hme_read32(hp, hp->bigmacregs + BMAC_TXCFG) &
                    ~(BIGMAC_TXCFG_ENABLE));
        while (hme_read32(hp, hp->bigmacregs + BMAC_TXCFG) & BIGMAC_TXCFG_ENABLE)
                barrier();
        if (full) {
                hp->happy_flags |= HFLAG_FULL;
                hme_write32(hp, hp->bigmacregs + BMAC_TXCFG,
                            hme_read32(hp, hp->bigmacregs + BMAC_TXCFG) |
                            BIGMAC_TXCFG_FULLDPLX);
        } else {
                hp->happy_flags &= ~(HFLAG_FULL);
                hme_write32(hp, hp->bigmacregs + BMAC_TXCFG,
                            hme_read32(hp, hp->bigmacregs + BMAC_TXCFG) &
                            ~(BIGMAC_TXCFG_FULLDPLX));
        }
        hme_write32(hp, hp->bigmacregs + BMAC_TXCFG,
                    hme_read32(hp, hp->bigmacregs + BMAC_TXCFG) |
                    BIGMAC_TXCFG_ENABLE);
        return 0;
no_response:
        return 1;
}

static int happy_meal_init(struct happy_meal *hp);

static int is_lucent_phy(struct happy_meal *hp)
{
        void __iomem *tregs = hp->tcvregs;
        unsigned short mr2, mr3;
        int ret = 0;

        mr2 = happy_meal_tcvr_read(hp, tregs, 2);
        mr3 = happy_meal_tcvr_read(hp, tregs, 3);
        if ((mr2 & 0xffff) == 0x0180 &&
            ((mr3 & 0xffff) >> 10) == 0x1d)
                ret = 1;

        return ret;
}

static void happy_meal_timer(struct timer_list *t)
{
        struct happy_meal *hp = from_timer(hp, t, happy_timer);
        void __iomem *tregs = hp->tcvregs;
        int restart_timer = 0;

        spin_lock_irq(&hp->happy_lock);

        hp->timer_ticks++;
        switch(hp->timer_state) {
        case arbwait:
                /* Only allow for 5 ticks, thats 10 seconds and much too
                 * long to wait for arbitration to complete.
                 */
                if (hp->timer_ticks >= 10) {
                        /* Enter force mode. */
        do_force_mode:
                        hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                        printk(KERN_NOTICE "%s: Auto-Negotiation unsuccessful, trying force link mode\n",
                               hp->dev->name);
                        hp->sw_bmcr = BMCR_SPEED100;
                        happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);

                        if (!is_lucent_phy(hp)) {
                                /* OK, seems we need do disable the transceiver for the first
                                 * tick to make sure we get an accurate link state at the
                                 * second tick.
                                 */
                                hp->sw_csconfig = happy_meal_tcvr_read(hp, tregs, DP83840_CSCONFIG);
                                hp->sw_csconfig &= ~(CSCONFIG_TCVDISAB);
                                happy_meal_tcvr_write(hp, tregs, DP83840_CSCONFIG, hp->sw_csconfig);
                        }
                        hp->timer_state = ltrywait;
                        hp->timer_ticks = 0;
                        restart_timer = 1;
                } else {
                        /* Anything interesting happen? */
                        hp->sw_bmsr = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
                        if (hp->sw_bmsr & BMSR_ANEGCOMPLETE) {
                                int ret;

                                /* Just what we've been waiting for... */
                                ret = set_happy_link_modes(hp, tregs);
                                if (ret) {
                                        /* Ooops, something bad happened, go to force
                                         * mode.
                                         *
                                         * XXX Broken hubs which don't support 802.3u
                                         * XXX auto-negotiation make this happen as well.
                                         */
                                        goto do_force_mode;
                                }

                                /* Success, at least so far, advance our state engine. */
                                hp->timer_state = lupwait;
                                restart_timer = 1;
                        } else {
                                restart_timer = 1;
                        }
                }
                break;

        case lupwait:
                /* Auto negotiation was successful and we are awaiting a
                 * link up status.  I have decided to let this timer run
                 * forever until some sort of error is signalled, reporting
                 * a message to the user at 10 second intervals.
                 */
                hp->sw_bmsr = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
                if (hp->sw_bmsr & BMSR_LSTATUS) {
                        /* Wheee, it's up, display the link mode in use and put
                         * the timer to sleep.
                         */
                        display_link_mode(hp, tregs);
                        hp->timer_state = asleep;
                        restart_timer = 0;
                } else {
                        if (hp->timer_ticks >= 10) {
                                printk(KERN_NOTICE "%s: Auto negotiation successful, link still "
                                       "not completely up.\n", hp->dev->name);
                                hp->timer_ticks = 0;
                                restart_timer = 1;
                        } else {
                                restart_timer = 1;
                        }
                }
                break;

        case ltrywait:
                /* Making the timeout here too long can make it take
                 * annoyingly long to attempt all of the link mode
                 * permutations, but then again this is essentially
                 * error recovery code for the most part.
                 */
                hp->sw_bmsr = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
                hp->sw_csconfig = happy_meal_tcvr_read(hp, tregs, DP83840_CSCONFIG);
                if (hp->timer_ticks == 1) {
                        if (!is_lucent_phy(hp)) {
                                /* Re-enable transceiver, we'll re-enable the transceiver next
                                 * tick, then check link state on the following tick.
                                 */
                                hp->sw_csconfig |= CSCONFIG_TCVDISAB;
                                happy_meal_tcvr_write(hp, tregs,
                                                      DP83840_CSCONFIG, hp->sw_csconfig);
                        }
                        restart_timer = 1;
                        break;
                }
                if (hp->timer_ticks == 2) {
                        if (!is_lucent_phy(hp)) {
                                hp->sw_csconfig &= ~(CSCONFIG_TCVDISAB);
                                happy_meal_tcvr_write(hp, tregs,
                                                      DP83840_CSCONFIG, hp->sw_csconfig);
                        }
                        restart_timer = 1;
                        break;
                }
                if (hp->sw_bmsr & BMSR_LSTATUS) {
                        /* Force mode selection success. */
                        display_forced_link_mode(hp, tregs);
                        set_happy_link_modes(hp, tregs); /* XXX error? then what? */
                        hp->timer_state = asleep;
                        restart_timer = 0;
                } else {
                        if (hp->timer_ticks >= 4) { /* 6 seconds or so... */
                                int ret;

                                ret = try_next_permutation(hp, tregs);
                                if (ret == -1) {
                                        /* Aieee, tried them all, reset the
                                         * chip and try all over again.
                                         */

                                        /* Let the user know... */
                                        printk(KERN_NOTICE "%s: Link down, cable problem?\n",
                                               hp->dev->name);

                                        ret = happy_meal_init(hp);
                                        if (ret) {
                                                /* ho hum... */
                                                printk(KERN_ERR "%s: Error, cannot re-init the "
                                                       "Happy Meal.\n", hp->dev->name);
                                        }
                                        goto out;
                                }
                                if (!is_lucent_phy(hp)) {
                                        hp->sw_csconfig = happy_meal_tcvr_read(hp, tregs,
                                                                               DP83840_CSCONFIG);
                                        hp->sw_csconfig |= CSCONFIG_TCVDISAB;
                                        happy_meal_tcvr_write(hp, tregs,
                                                              DP83840_CSCONFIG, hp->sw_csconfig);
                                }
                                hp->timer_ticks = 0;
                                restart_timer = 1;
                        } else {
                                restart_timer = 1;
                        }
                }
                break;

        case asleep:
        default:
                /* Can't happens.... */
                printk(KERN_ERR "%s: Aieee, link timer is asleep but we got one anyways!\n",
                       hp->dev->name);
                restart_timer = 0;
                hp->timer_ticks = 0;
                hp->timer_state = asleep; /* foo on you */
                break;
        }

        if (restart_timer) {
                hp->happy_timer.expires = jiffies + ((12 * HZ)/10); /* 1.2 sec. */
                add_timer(&hp->happy_timer);
        }

out:
        spin_unlock_irq(&hp->happy_lock);
}

#define TX_RESET_TRIES     32
#define RX_RESET_TRIES     32

/* hp->happy_lock must be held */
static void happy_meal_tx_reset(struct happy_meal *hp, void __iomem *bregs)
{
        int tries = TX_RESET_TRIES;

        HMD(("happy_meal_tx_reset: reset, "));

        /* Would you like to try our SMCC Delux? */
        hme_write32(hp, bregs + BMAC_TXSWRESET, 0);
        while ((hme_read32(hp, bregs + BMAC_TXSWRESET) & 1) && --tries)
                udelay(20);

        /* Lettuce, tomato, buggy hardware (no extra charge)? */
        if (!tries)
                printk(KERN_ERR "happy meal: Transceiver BigMac ATTACK!");

        /* Take care. */
        HMD(("done\n"));
}

/* hp->happy_lock must be held */
static void happy_meal_rx_reset(struct happy_meal *hp, void __iomem *bregs)
{
        int tries = RX_RESET_TRIES;

        HMD(("happy_meal_rx_reset: reset, "));

        /* We have a special on GNU/Viking hardware bugs today. */
        hme_write32(hp, bregs + BMAC_RXSWRESET, 0);
        while ((hme_read32(hp, bregs + BMAC_RXSWRESET) & 1) && --tries)
                udelay(20);

        /* Will that be all? */
        if (!tries)
                printk(KERN_ERR "happy meal: Receiver BigMac ATTACK!");

        /* Don't forget your vik_1137125_wa.  Have a nice day. */
        HMD(("done\n"));
}

#define STOP_TRIES         16

/* hp->happy_lock must be held */
static void happy_meal_stop(struct happy_meal *hp, void __iomem *gregs)
{
        int tries = STOP_TRIES;

        HMD(("happy_meal_stop: reset, "));

        /* We're consolidating our STB products, it's your lucky day. */
        hme_write32(hp, gregs + GREG_SWRESET, GREG_RESET_ALL);
        while (hme_read32(hp, gregs + GREG_SWRESET) && --tries)
                udelay(20);

        /* Come back next week when we are "Sun Microelectronics". */
        if (!tries)
                printk(KERN_ERR "happy meal: Fry guys.");

        /* Remember: "Different name, same old buggy as shit hardware." */
        HMD(("done\n"));
}

/* hp->happy_lock must be held */
static void happy_meal_get_counters(struct happy_meal *hp, void __iomem *bregs)
{
        struct net_device_stats *stats = &hp->dev->stats;

        stats->rx_crc_errors += hme_read32(hp, bregs + BMAC_RCRCECTR);
        hme_write32(hp, bregs + BMAC_RCRCECTR, 0);

        stats->rx_frame_errors += hme_read32(hp, bregs + BMAC_UNALECTR);
        hme_write32(hp, bregs + BMAC_UNALECTR, 0);

        stats->rx_length_errors += hme_read32(hp, bregs + BMAC_GLECTR);
        hme_write32(hp, bregs + BMAC_GLECTR, 0);

        stats->tx_aborted_errors += hme_read32(hp, bregs + BMAC_EXCTR);

        stats->collisions +=
                (hme_read32(hp, bregs + BMAC_EXCTR) +
                 hme_read32(hp, bregs + BMAC_LTCTR));
        hme_write32(hp, bregs + BMAC_EXCTR, 0);
        hme_write32(hp, bregs + BMAC_LTCTR, 0);
}

/* hp->happy_lock must be held */
static void happy_meal_poll_stop(struct happy_meal *hp, void __iomem *tregs)
{
        ASD(("happy_meal_poll_stop: "));

        /* If polling disabled or not polling already, nothing to do. */
        if ((hp->happy_flags & (HFLAG_POLLENABLE | HFLAG_POLL)) !=
           (HFLAG_POLLENABLE | HFLAG_POLL)) {
                HMD(("not polling, return\n"));
                return;
        }

        /* Shut up the MIF. */
        ASD(("were polling, mif ints off, "));
        hme_write32(hp, tregs + TCVR_IMASK, 0xffff);

        /* Turn off polling. */
        ASD(("polling off, "));
        hme_write32(hp, tregs + TCVR_CFG,
                    hme_read32(hp, tregs + TCVR_CFG) & ~(TCV_CFG_PENABLE));

        /* We are no longer polling. */
        hp->happy_flags &= ~(HFLAG_POLL);

        /* Let the bits set. */
        udelay(200);
        ASD(("done\n"));
}

/* Only Sun can take such nice parts and fuck up the programming interface
 * like this.  Good job guys...
 */
#define TCVR_RESET_TRIES       16 /* It should reset quickly        */
#define TCVR_UNISOLATE_TRIES   32 /* Dis-isolation can take longer. */

/* hp->happy_lock must be held */
static int happy_meal_tcvr_reset(struct happy_meal *hp, void __iomem *tregs)
{
        u32 tconfig;
        int result, tries = TCVR_RESET_TRIES;

        tconfig = hme_read32(hp, tregs + TCVR_CFG);
        ASD(("happy_meal_tcvr_reset: tcfg<%08lx> ", tconfig));
        if (hp->tcvr_type == external) {

                ASD(("external<"));
                hme_write32(hp, tregs + TCVR_CFG, tconfig & ~(TCV_CFG_PSELECT));
                hp->tcvr_type = internal;
                hp->paddr = TCV_PADDR_ITX;
                ASD(("ISOLATE,"));
                happy_meal_tcvr_write(hp, tregs, MII_BMCR,
                                      (BMCR_LOOPBACK|BMCR_PDOWN|BMCR_ISOLATE));
                result = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                if (result == TCVR_FAILURE) {
                        ASD(("phyread_fail>\n"));
                        return -1;
                }
                ASD(("phyread_ok,PSELECT>"));
                hme_write32(hp, tregs + TCVR_CFG, tconfig | TCV_CFG_PSELECT);
                hp->tcvr_type = external;
                hp->paddr = TCV_PADDR_ETX;
        } else {
                if (tconfig & TCV_CFG_MDIO1) {
                        ASD(("internal<PSELECT,"));
                        hme_write32(hp, tregs + TCVR_CFG, (tconfig | TCV_CFG_PSELECT));
                        ASD(("ISOLATE,"));
                        happy_meal_tcvr_write(hp, tregs, MII_BMCR,
                                              (BMCR_LOOPBACK|BMCR_PDOWN|BMCR_ISOLATE));
                        result = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                        if (result == TCVR_FAILURE) {
                                ASD(("phyread_fail>\n"));
                                return -1;
                        }
                        ASD(("phyread_ok,~PSELECT>"));
                        hme_write32(hp, tregs + TCVR_CFG, (tconfig & ~(TCV_CFG_PSELECT)));
                        hp->tcvr_type = internal;
                        hp->paddr = TCV_PADDR_ITX;
                }
        }

        ASD(("BMCR_RESET "));
        happy_meal_tcvr_write(hp, tregs, MII_BMCR, BMCR_RESET);

        while (--tries) {
                result = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                if (result == TCVR_FAILURE)
                        return -1;
                hp->sw_bmcr = result;
                if (!(result & BMCR_RESET))
                        break;
                udelay(20);
        }
        if (!tries) {
                ASD(("BMCR RESET FAILED!\n"));
                return -1;
        }
        ASD(("RESET_OK\n"));

        /* Get fresh copies of the PHY registers. */
        hp->sw_bmsr      = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
        hp->sw_physid1   = happy_meal_tcvr_read(hp, tregs, MII_PHYSID1);
        hp->sw_physid2   = happy_meal_tcvr_read(hp, tregs, MII_PHYSID2);
        hp->sw_advertise = happy_meal_tcvr_read(hp, tregs, MII_ADVERTISE);

        ASD(("UNISOLATE"));
        hp->sw_bmcr &= ~(BMCR_ISOLATE);
        happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);

        tries = TCVR_UNISOLATE_TRIES;
        while (--tries) {
                result = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                if (result == TCVR_FAILURE)
                        return -1;
                if (!(result & BMCR_ISOLATE))
                        break;
                udelay(20);
        }
        if (!tries) {
                ASD((" FAILED!\n"));
                return -1;
        }
        ASD((" SUCCESS and CSCONFIG_DFBYPASS\n"));
        if (!is_lucent_phy(hp)) {
                result = happy_meal_tcvr_read(hp, tregs,
                                              DP83840_CSCONFIG);
                happy_meal_tcvr_write(hp, tregs,
                                      DP83840_CSCONFIG, (result | CSCONFIG_DFBYPASS));
        }
        return 0;
}

/* Figure out whether we have an internal or external transceiver.
 *
 * hp->happy_lock must be held
 */
static void happy_meal_transceiver_check(struct happy_meal *hp, void __iomem *tregs)
{
        unsigned long tconfig = hme_read32(hp, tregs + TCVR_CFG);

        ASD(("happy_meal_transceiver_check: tcfg=%08lx ", tconfig));
        if (hp->happy_flags & HFLAG_POLL) {
                /* If we are polling, we must stop to get the transceiver type. */
                ASD(("<polling> "));
                if (hp->tcvr_type == internal) {
                        if (tconfig & TCV_CFG_MDIO1) {
                                ASD(("<internal> <poll stop> "));
                                happy_meal_poll_stop(hp, tregs);
                                hp->paddr = TCV_PADDR_ETX;
                                hp->tcvr_type = external;
                                ASD(("<external>\n"));
                                tconfig &= ~(TCV_CFG_PENABLE);
                                tconfig |= TCV_CFG_PSELECT;
                                hme_write32(hp, tregs + TCVR_CFG, tconfig);
                        }
                } else {
                        if (hp->tcvr_type == external) {
                                ASD(("<external> "));
                                if (!(hme_read32(hp, tregs + TCVR_STATUS) >> 16)) {
                                        ASD(("<poll stop> "));
                                        happy_meal_poll_stop(hp, tregs);
                                        hp->paddr = TCV_PADDR_ITX;
                                        hp->tcvr_type = internal;
                                        ASD(("<internal>\n"));
                                        hme_write32(hp, tregs + TCVR_CFG,
                                                    hme_read32(hp, tregs + TCVR_CFG) &
                                                    ~(TCV_CFG_PSELECT));
                                }
                                ASD(("\n"));
                        } else {
                                ASD(("<none>\n"));
                        }
                }
        } else {
                u32 reread = hme_read32(hp, tregs + TCVR_CFG);

                /* Else we can just work off of the MDIO bits. */
                ASD(("<not polling> "));
                if (reread & TCV_CFG_MDIO1) {
                        hme_write32(hp, tregs + TCVR_CFG, tconfig | TCV_CFG_PSELECT);
                        hp->paddr = TCV_PADDR_ETX;
                        hp->tcvr_type = external;
                        ASD(("<external>\n"));
                } else {
                        if (reread & TCV_CFG_MDIO0) {
                                hme_write32(hp, tregs + TCVR_CFG,
                                            tconfig & ~(TCV_CFG_PSELECT));
                                hp->paddr = TCV_PADDR_ITX;
                                hp->tcvr_type = internal;
                                ASD(("<internal>\n"));
                        } else {
                                printk(KERN_ERR "happy meal: Transceiver and a coke please.");
                                hp->tcvr_type = none; /* Grrr... */
                                ASD(("<none>\n"));
                        }
                }
        }
}

/* The receive ring buffers are a bit tricky to get right.  Here goes...
 *
 * The buffers we dma into must be 64 byte aligned.  So we use a special
 * alloc_skb() routine for the happy meal to allocate 64 bytes more than
 * we really need.
 *
 * We use skb_reserve() to align the data block we get in the skb.  We
 * also program the etxregs->cfg register to use an offset of 2.  This
 * imperical constant plus the ethernet header size will always leave
 * us with a nicely aligned ip header once we pass things up to the
 * protocol layers.
 *
 * The numbers work out to:
 *
 *         Max ethernet frame size         1518
 *         Ethernet header size              14
 *         Happy Meal base offset             2
 *
 * Say a skb data area is at 0xf001b010, and its size alloced is
 * (ETH_FRAME_LEN + 64 + 2) = (1514 + 64 + 2) = 1580 bytes.
 *
 * First our alloc_skb() routine aligns the data base to a 64 byte
 * boundary.  We now have 0xf001b040 as our skb data address.  We
 * plug this into the receive descriptor address.
 *
 * Next, we skb_reserve() 2 bytes to account for the Happy Meal offset.
 * So now the data we will end up looking at starts at 0xf001b042.  When
 * the packet arrives, we will check out the size received and subtract
 * this from the skb->length.  Then we just pass the packet up to the
 * protocols as is, and allocate a new skb to replace this slot we have
 * just received from.
 *
 * The ethernet layer will strip the ether header from the front of the
 * skb we just sent to it, this leaves us with the ip header sitting
 * nicely aligned at 0xf001b050.  Also, for tcp and udp packets the
 * Happy Meal has even checksummed the tcp/udp data for us.  The 16
 * bit checksum is obtained from the low bits of the receive descriptor
 * flags, thus:
 *
 *      skb->csum = rxd->rx_flags & 0xffff;
 *      skb->ip_summed = CHECKSUM_COMPLETE;
 *
 * before sending off the skb to the protocols, and we are good as gold.
 */
static void happy_meal_clean_rings(struct happy_meal *hp)
{
        int i;

        for (i = 0; i < RX_RING_SIZE; i++) {
                if (hp->rx_skbs[i] != NULL) {
                        struct sk_buff *skb = hp->rx_skbs[i];
                        struct happy_meal_rxd *rxd;
                        u32 dma_addr;

                        rxd = &hp->happy_block->happy_meal_rxd[i];
                        dma_addr = hme_read_desc32(hp, &rxd->rx_addr);
                        dma_unmap_single(hp->dma_dev, dma_addr,
                                         RX_BUF_ALLOC_SIZE, DMA_FROM_DEVICE);
                        dev_kfree_skb_any(skb);
                        hp->rx_skbs[i] = NULL;
                }
        }

        for (i = 0; i < TX_RING_SIZE; i++) {
                if (hp->tx_skbs[i] != NULL) {
                        struct sk_buff *skb = hp->tx_skbs[i];
                        struct happy_meal_txd *txd;
                        u32 dma_addr;
                        int frag;

                        hp->tx_skbs[i] = NULL;

                        for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
                                txd = &hp->happy_block->happy_meal_txd[i];
                                dma_addr = hme_read_desc32(hp, &txd->tx_addr);
                                if (!frag)
                                        dma_unmap_single(hp->dma_dev, dma_addr,
                                                         (hme_read_desc32(hp, &txd->tx_flags)
                                                          & TXFLAG_SIZE),
                                                         DMA_TO_DEVICE);
                                else
                                        dma_unmap_page(hp->dma_dev, dma_addr,
                                                         (hme_read_desc32(hp, &txd->tx_flags)
                                                          & TXFLAG_SIZE),
                                                         DMA_TO_DEVICE);

                                if (frag != skb_shinfo(skb)->nr_frags)
                                        i++;
                        }

                        dev_kfree_skb_any(skb);
                }
        }
}

/* hp->happy_lock must be held */
static void happy_meal_init_rings(struct happy_meal *hp)
{
        struct hmeal_init_block *hb = hp->happy_block;
        int i;

        HMD(("happy_meal_init_rings: counters to zero, "));
        hp->rx_new = hp->rx_old = hp->tx_new = hp->tx_old = 0;

        /* Free any skippy bufs left around in the rings. */
        HMD(("clean, "));
        happy_meal_clean_rings(hp);

        /* Now get new skippy bufs for the receive ring. */
        HMD(("init rxring, "));
        for (i = 0; i < RX_RING_SIZE; i++) {
                struct sk_buff *skb;
                u32 mapping;

                skb = happy_meal_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
                if (!skb) {
                        hme_write_rxd(hp, &hb->happy_meal_rxd[i], 0, 0);
                        continue;
                }
                hp->rx_skbs[i] = skb;

                /* Because we reserve afterwards. */
                skb_put(skb, (ETH_FRAME_LEN + RX_OFFSET + 4));
                mapping = dma_map_single(hp->dma_dev, skb->data, RX_BUF_ALLOC_SIZE,
                                         DMA_FROM_DEVICE);
                if (dma_mapping_error(hp->dma_dev, mapping)) {
                        dev_kfree_skb_any(skb);
                        hme_write_rxd(hp, &hb->happy_meal_rxd[i], 0, 0);
                        continue;
                }
                hme_write_rxd(hp, &hb->happy_meal_rxd[i],
                              (RXFLAG_OWN | ((RX_BUF_ALLOC_SIZE - RX_OFFSET) << 16)),
                              mapping);
                skb_reserve(skb, RX_OFFSET);
        }

        HMD(("init txring, "));
        for (i = 0; i < TX_RING_SIZE; i++)
                hme_write_txd(hp, &hb->happy_meal_txd[i], 0, 0);

        HMD(("done\n"));
}

/* hp->happy_lock must be held */
static void
happy_meal_begin_auto_negotiation(struct happy_meal *hp,
                                  void __iomem *tregs,
                                  const struct ethtool_link_ksettings *ep)
{
        int timeout;

        /* Read all of the registers we are interested in now. */
        hp->sw_bmsr      = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
        hp->sw_bmcr      = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
        hp->sw_physid1   = happy_meal_tcvr_read(hp, tregs, MII_PHYSID1);
        hp->sw_physid2   = happy_meal_tcvr_read(hp, tregs, MII_PHYSID2);

        /* XXX Check BMSR_ANEGCAPABLE, should not be necessary though. */

        hp->sw_advertise = happy_meal_tcvr_read(hp, tregs, MII_ADVERTISE);
        if (!ep || ep->base.autoneg == AUTONEG_ENABLE) {
                /* Advertise everything we can support. */
                if (hp->sw_bmsr & BMSR_10HALF)
                        hp->sw_advertise |= (ADVERTISE_10HALF);
                else
                        hp->sw_advertise &= ~(ADVERTISE_10HALF);

                if (hp->sw_bmsr & BMSR_10FULL)
                        hp->sw_advertise |= (ADVERTISE_10FULL);
                else
                        hp->sw_advertise &= ~(ADVERTISE_10FULL);
                if (hp->sw_bmsr & BMSR_100HALF)
                        hp->sw_advertise |= (ADVERTISE_100HALF);
                else
                        hp->sw_advertise &= ~(ADVERTISE_100HALF);
                if (hp->sw_bmsr & BMSR_100FULL)
                        hp->sw_advertise |= (ADVERTISE_100FULL);
                else
                        hp->sw_advertise &= ~(ADVERTISE_100FULL);
                happy_meal_tcvr_write(hp, tregs, MII_ADVERTISE, hp->sw_advertise);

                /* XXX Currently no Happy Meal cards I know off support 100BaseT4,
                 * XXX and this is because the DP83840 does not support it, changes
                 * XXX would need to be made to the tx/rx logic in the driver as well
                 * XXX so I completely skip checking for it in the BMSR for now.
                 */

#ifdef AUTO_SWITCH_DEBUG
                ASD(("%s: Advertising [ ", hp->dev->name));
                if (hp->sw_advertise & ADVERTISE_10HALF)
                        ASD(("10H "));
                if (hp->sw_advertise & ADVERTISE_10FULL)
                        ASD(("10F "));
                if (hp->sw_advertise & ADVERTISE_100HALF)
                        ASD(("100H "));
                if (hp->sw_advertise & ADVERTISE_100FULL)
                        ASD(("100F "));
#endif

                /* Enable Auto-Negotiation, this is usually on already... */
                hp->sw_bmcr |= BMCR_ANENABLE;
                happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);

                /* Restart it to make sure it is going. */
                hp->sw_bmcr |= BMCR_ANRESTART;
                happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);

                /* BMCR_ANRESTART self clears when the process has begun. */

                timeout = 64;  /* More than enough. */
                while (--timeout) {
                        hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
                        if (!(hp->sw_bmcr & BMCR_ANRESTART))
                                break; /* got it. */
                        udelay(10);
                }
                if (!timeout) {
                        printk(KERN_ERR "%s: Happy Meal would not start auto negotiation "
                               "BMCR=0x%04x\n", hp->dev->name, hp->sw_bmcr);
                        printk(KERN_NOTICE "%s: Performing force link detection.\n",
                               hp->dev->name);
                        goto force_link;
                } else {
                        hp->timer_state = arbwait;
                }
        } else {
force_link:
                /* Force the link up, trying first a particular mode.
                 * Either we are here at the request of ethtool or
                 * because the Happy Meal would not start to autoneg.
                 */

                /* Disable auto-negotiation in BMCR, enable the duplex and
                 * speed setting, init the timer state machine, and fire it off.
                 */
                if (!ep || ep->base.autoneg == AUTONEG_ENABLE) {
                        hp->sw_bmcr = BMCR_SPEED100;
                } else {
                        if (ep->base.speed == SPEED_100)
                                hp->sw_bmcr = BMCR_SPEED100;
                        else
                                hp->sw_bmcr = 0;
                        if (ep->base.duplex == DUPLEX_FULL)
                                hp->sw_bmcr |= BMCR_FULLDPLX;
                }
                happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);

                if (!is_lucent_phy(hp)) {
                        /* OK, seems we need do disable the transceiver for the first
                         * tick to make sure we get an accurate link state at the
                         * second tick.
                         */
                        hp->sw_csconfig = happy_meal_tcvr_read(hp, tregs,
                                                               DP83840_CSCONFIG);
                        hp->sw_csconfig &= ~(CSCONFIG_TCVDISAB);
                        happy_meal_tcvr_write(hp, tregs, DP83840_CSCONFIG,
                                              hp->sw_csconfig);
                }
                hp->timer_state = ltrywait;
        }

        hp->timer_ticks = 0;
        hp->happy_timer.expires = jiffies + (12 * HZ)/10;  /* 1.2 sec. */
        add_timer(&hp->happy_timer);
}

/* hp->happy_lock must be held */
static int happy_meal_init(struct happy_meal *hp)
{
        void __iomem *gregs        = hp->gregs;
        void __iomem *etxregs      = hp->etxregs;
        void __iomem *erxregs      = hp->erxregs;
        void __iomem *bregs        = hp->bigmacregs;
        void __iomem *tregs        = hp->tcvregs;
        u32 regtmp, rxcfg;
        unsigned char *e = &hp->dev->dev_addr[0];

        /* If auto-negotiation timer is running, kill it. */
        del_timer(&hp->happy_timer);

        HMD(("happy_meal_init: happy_flags[%08x] ",
             hp->happy_flags));
        if (!(hp->happy_flags & HFLAG_INIT)) {
                HMD(("set HFLAG_INIT, "));
                hp->happy_flags |= HFLAG_INIT;
                happy_meal_get_counters(hp, bregs);
        }

        /* Stop polling. */
        HMD(("to happy_meal_poll_stop\n"));
        happy_meal_poll_stop(hp, tregs);

        /* Stop transmitter and receiver. */
        HMD(("happy_meal_init: to happy_meal_stop\n"));
        happy_meal_stop(hp, gregs);

        /* Alloc and reset the tx/rx descriptor chains. */
        HMD(("happy_meal_init: to happy_meal_init_rings\n"));
        happy_meal_init_rings(hp);

        /* Shut up the MIF. */
        HMD(("happy_meal_init: Disable all MIF irqs (old[%08x]), ",
             hme_read32(hp, tregs + TCVR_IMASK)));
        hme_write32(hp, tregs + TCVR_IMASK, 0xffff);

        /* See if we can enable the MIF frame on this card to speak to the DP83840. */
        if (hp->happy_flags & HFLAG_FENABLE) {
                HMD(("use frame old[%08x], ",
                     hme_read32(hp, tregs + TCVR_CFG)));
                hme_write32(hp, tregs + TCVR_CFG,
                            hme_read32(hp, tregs + TCVR_CFG) & ~(TCV_CFG_BENABLE));
        } else {
                HMD(("use bitbang old[%08x], ",
                     hme_read32(hp, tregs + TCVR_CFG)));
                hme_write32(hp, tregs + TCVR_CFG,
                            hme_read32(hp, tregs + TCVR_CFG) | TCV_CFG_BENABLE);
        }

        /* Check the state of the transceiver. */
        HMD(("to happy_meal_transceiver_check\n"));
        happy_meal_transceiver_check(hp, tregs);

        /* Put the Big Mac into a sane state. */
        HMD(("happy_meal_init: "));
        switch(hp->tcvr_type) {
        case none:
                /* Cannot operate if we don't know the transceiver type! */
                HMD(("AAIEEE no transceiver type, EAGAIN"));
                return -EAGAIN;

        case internal:
                /* Using the MII buffers. */
                HMD(("internal, using MII, "));
                hme_write32(hp, bregs + BMAC_XIFCFG, 0);
                break;

        case external:
                /* Not using the MII, disable it. */
                HMD(("external, disable MII, "));
                hme_write32(hp, bregs + BMAC_XIFCFG, BIGMAC_XCFG_MIIDISAB);
                break;
        }

        if (happy_meal_tcvr_reset(hp, tregs))
                return -EAGAIN;

        /* Reset the Happy Meal Big Mac transceiver and the receiver. */
        HMD(("tx/rx reset, "));
        happy_meal_tx_reset(hp, bregs);
        happy_meal_rx_reset(hp, bregs);

        /* Set jam size and inter-packet gaps to reasonable defaults. */
        HMD(("jsize/ipg1/ipg2, "));
        hme_write32(hp, bregs + BMAC_JSIZE, DEFAULT_JAMSIZE);
        hme_write32(hp, bregs + BMAC_IGAP1, DEFAULT_IPG1);
        hme_write32(hp, bregs + BMAC_IGAP2, DEFAULT_IPG2);

        /* Load up the MAC address and random seed. */
        HMD(("rseed/macaddr, "));

        /* The docs recommend to use the 10LSB of our MAC here. */
        hme_write32(hp, bregs + BMAC_RSEED, ((e[5] | e[4]<<8)&0x3ff));

        hme_write32(hp, bregs + BMAC_MACADDR2, ((e[4] << 8) | e[5]));
        hme_write32(hp, bregs + BMAC_MACADDR1, ((e[2] << 8) | e[3]));
        hme_write32(hp, bregs + BMAC_MACADDR0, ((e[0] << 8) | e[1]));

        HMD(("htable, "));
        if ((hp->dev->flags & IFF_ALLMULTI) ||
            (netdev_mc_count(hp->dev) > 64)) {
                hme_write32(hp, bregs + BMAC_HTABLE0, 0xffff);
                hme_write32(hp, bregs + BMAC_HTABLE1, 0xffff);
                hme_write32(hp, bregs + BMAC_HTABLE2, 0xffff);
                hme_write32(hp, bregs + BMAC_HTABLE3, 0xffff);
        } else if ((hp->dev->flags & IFF_PROMISC) == 0) {
                u16 hash_table[4];
                struct netdev_hw_addr *ha;
                u32 crc;

                memset(hash_table, 0, sizeof(hash_table));
                netdev_for_each_mc_addr(ha, hp->dev) {
                        crc = ether_crc_le(6, ha->addr);
                        crc >>= 26;
                        hash_table[crc >> 4] |= 1 << (crc & 0xf);
                }
                hme_write32(hp, bregs + BMAC_HTABLE0, hash_table[0]);
                hme_write32(hp, bregs + BMAC_HTABLE1, hash_table[1]);
                hme_write32(hp, bregs + BMAC_HTABLE2, hash_table[2]);
                hme_write32(hp, bregs + BMAC_HTABLE3, hash_table[3]);
        } else {
                hme_write32(hp, bregs + BMAC_HTABLE3, 0);
                hme_write32(hp, bregs + BMAC_HTABLE2, 0);
                hme_write32(hp, bregs + BMAC_HTABLE1, 0);
                hme_write32(hp, bregs + BMAC_HTABLE0, 0);
        }

        /* Set the RX and TX ring ptrs. */
        HMD(("ring ptrs rxr[%08x] txr[%08x]\n",
             ((__u32)hp->hblock_dvma + hblock_offset(happy_meal_rxd, 0)),
             ((__u32)hp->hblock_dvma + hblock_offset(happy_meal_txd, 0))));
        hme_write32(hp, erxregs + ERX_RING,
                    ((__u32)hp->hblock_dvma + hblock_offset(happy_meal_rxd, 0)));
        hme_write32(hp, etxregs + ETX_RING,
                    ((__u32)hp->hblock_dvma + hblock_offset(happy_meal_txd, 0)));

        /* Parity issues in the ERX unit of some HME revisions can cause some
         * registers to not be written unless their parity is even.  Detect such
         * lost writes and simply rewrite with a low bit set (which will be ignored
         * since the rxring needs to be 2K aligned).
         */
        if (hme_read32(hp, erxregs + ERX_RING) !=
            ((__u32)hp->hblock_dvma + hblock_offset(happy_meal_rxd, 0)))
                hme_write32(hp, erxregs + ERX_RING,
                            ((__u32)hp->hblock_dvma + hblock_offset(happy_meal_rxd, 0))
                            | 0x4);

        /* Set the supported burst sizes. */
        HMD(("happy_meal_init: old[%08x] bursts<",
             hme_read32(hp, gregs + GREG_CFG)));

#ifndef CONFIG_SPARC
        /* It is always PCI and can handle 64byte bursts. */
        hme_write32(hp, gregs + GREG_CFG, GREG_CFG_BURST64);
#else
        if ((hp->happy_bursts & DMA_BURST64) &&
            ((hp->happy_flags & HFLAG_PCI) != 0
#ifdef CONFIG_SBUS
             || sbus_can_burst64()
#endif
             || 0)) {
                u32 gcfg = GREG_CFG_BURST64;

                /* I have no idea if I should set the extended
                 * transfer mode bit for Cheerio, so for now I
                 * do not.  -DaveM
                 */
#ifdef CONFIG_SBUS
                if ((hp->happy_flags & HFLAG_PCI) == 0) {
                        struct platform_device *op = hp->happy_dev;
                        if (sbus_can_dma_64bit()) {
                                sbus_set_sbus64(&op->dev,
                                                hp->happy_bursts);
                                gcfg |= GREG_CFG_64BIT;
                        }
                }
#endif

                HMD(("64>"));
                hme_write32(hp, gregs + GREG_CFG, gcfg);
        } else if (hp->happy_bursts & DMA_BURST32) {
                HMD(("32>"));
                hme_write32(hp, gregs + GREG_CFG, GREG_CFG_BURST32);
        } else if (hp->happy_bursts & DMA_BURST16) {
                HMD(("16>"));
                hme_write32(hp, gregs + GREG_CFG, GREG_CFG_BURST16);
        } else {
                HMD(("XXX>"));
                hme_write32(hp, gregs + GREG_CFG, 0);
        }
#endif /* CONFIG_SPARC */

        /* Turn off interrupts we do not want to hear. */
        HMD((", enable global interrupts, "));
        hme_write32(hp, gregs + GREG_IMASK,
                    (GREG_IMASK_GOTFRAME | GREG_IMASK_RCNTEXP |
                     GREG_IMASK_SENTFRAME | GREG_IMASK_TXPERR));

        /* Set the transmit ring buffer size. */
        HMD(("tx rsize=%d oreg[%08x], ", (int)TX_RING_SIZE,
             hme_read32(hp, etxregs + ETX_RSIZE)));
        hme_write32(hp, etxregs + ETX_RSIZE, (TX_RING_SIZE >> ETX_RSIZE_SHIFT) - 1);

        /* Enable transmitter DVMA. */
        HMD(("tx dma enable old[%08x], ",
             hme_read32(hp, etxregs + ETX_CFG)));
        hme_write32(hp, etxregs + ETX_CFG,
                    hme_read32(hp, etxregs + ETX_CFG) | ETX_CFG_DMAENABLE);

        /* This chip really rots, for the receiver sometimes when you
         * write to its control registers not all the bits get there
         * properly.  I cannot think of a sane way to provide complete
         * coverage for this hardware bug yet.
         */
        HMD(("erx regs bug old[%08x]\n",
             hme_read32(hp, erxregs + ERX_CFG)));
        hme_write32(hp, erxregs + ERX_CFG, ERX_CFG_DEFAULT(RX_OFFSET));
        regtmp = hme_read32(hp, erxregs + ERX_CFG);
        hme_write32(hp, erxregs + ERX_CFG, ERX_CFG_DEFAULT(RX_OFFSET));
        if (hme_read32(hp, erxregs + ERX_CFG) != ERX_CFG_DEFAULT(RX_OFFSET)) {
                printk(KERN_ERR "happy meal: Eieee, rx config register gets greasy fries.\n");
                printk(KERN_ERR "happy meal: Trying to set %08x, reread gives %08x\n",
                       ERX_CFG_DEFAULT(RX_OFFSET), regtmp);
                /* XXX Should return failure here... */
        }

        /* Enable Big Mac hash table filter. */
        HMD(("happy_meal_init: enable hash rx_cfg_old[%08x], ",
             hme_read32(hp, bregs + BMAC_RXCFG)));
        rxcfg = BIGMAC_RXCFG_HENABLE | BIGMAC_RXCFG_REJME;
        if (hp->dev->flags & IFF_PROMISC)
                rxcfg |= BIGMAC_RXCFG_PMISC;
        hme_write32(hp, bregs + BMAC_RXCFG, rxcfg);

        /* Let the bits settle in the chip. */
        udelay(10);

        /* Ok, configure the Big Mac transmitter. */
        HMD(("BIGMAC init, "));
        regtmp = 0;
        if (hp->happy_flags & HFLAG_FULL)
                regtmp |= BIGMAC_TXCFG_FULLDPLX;

        /* Don't turn on the "don't give up" bit for now.  It could cause hme
         * to deadlock with the PHY if a Jabber occurs.
         */
        hme_write32(hp, bregs + BMAC_TXCFG, regtmp /*| BIGMAC_TXCFG_DGIVEUP*/);

        /* Give up after 16 TX attempts. */
        hme_write32(hp, bregs + BMAC_ALIMIT, 16);

        /* Enable the output drivers no matter what. */
        regtmp = BIGMAC_XCFG_ODENABLE;

        /* If card can do lance mode, enable it. */
        if (hp->happy_flags & HFLAG_LANCE)
                regtmp |= (DEFAULT_IPG0 << 5) | BIGMAC_XCFG_LANCE;

        /* Disable the MII buffers if using external transceiver. */
        if (hp->tcvr_type == external)
                regtmp |= BIGMAC_XCFG_MIIDISAB;

        HMD(("XIF config old[%08x], ",
             hme_read32(hp, bregs + BMAC_XIFCFG)));
        hme_write32(hp, bregs + BMAC_XIFCFG, regtmp);

        /* Start things up. */
        HMD(("tx old[%08x] and rx [%08x] ON!\n",
             hme_read32(hp, bregs + BMAC_TXCFG),
             hme_read32(hp, bregs + BMAC_RXCFG)));

        /* Set larger TX/RX size to allow for 802.1q */
        hme_write32(hp, bregs + BMAC_TXMAX, ETH_FRAME_LEN + 8);
        hme_write32(hp, bregs + BMAC_RXMAX, ETH_FRAME_LEN + 8);

        hme_write32(hp, bregs + BMAC_TXCFG,
                    hme_read32(hp, bregs + BMAC_TXCFG) | BIGMAC_TXCFG_ENABLE);
        hme_write32(hp, bregs + BMAC_RXCFG,
                    hme_read32(hp, bregs + BMAC_RXCFG) | BIGMAC_RXCFG_ENABLE);

        /* Get the autonegotiation started, and the watch timer ticking. */
        happy_meal_begin_auto_negotiation(hp, tregs, NULL);

        /* Success. */
        return 0;
}

/* hp->happy_lock must be held */
static void happy_meal_set_initial_advertisement(struct happy_meal *hp)
{
        void __iomem *tregs     = hp->tcvregs;
        void __iomem *bregs     = hp->bigmacregs;
        void __iomem *gregs     = hp->gregs;

        happy_meal_stop(hp, gregs);
        hme_write32(hp, tregs + TCVR_IMASK, 0xffff);
        if (hp->happy_flags & HFLAG_FENABLE)
                hme_write32(hp, tregs + TCVR_CFG,
                            hme_read32(hp, tregs + TCVR_CFG) & ~(TCV_CFG_BENABLE));
        else
                hme_write32(hp, tregs + TCVR_CFG,
                            hme_read32(hp, tregs + TCVR_CFG) | TCV_CFG_BENABLE);
        happy_meal_transceiver_check(hp, tregs);
        switch(hp->tcvr_type) {
        case none:
                return;
        case internal:
                hme_write32(hp, bregs + BMAC_XIFCFG, 0);
                break;
        case external:
                hme_write32(hp, bregs + BMAC_XIFCFG, BIGMAC_XCFG_MIIDISAB);
                break;
        }
        if (happy_meal_tcvr_reset(hp, tregs))
                return;

        /* Latch PHY registers as of now. */
        hp->sw_bmsr      = happy_meal_tcvr_read(hp, tregs, MII_BMSR);
        hp->sw_advertise = happy_meal_tcvr_read(hp, tregs, MII_ADVERTISE);

        /* Advertise everything we can support. */
        if (hp->sw_bmsr & BMSR_10HALF)
                hp->sw_advertise |= (ADVERTISE_10HALF);
        else
                hp->sw_advertise &= ~(ADVERTISE_10HALF);

        if (hp->sw_bmsr & BMSR_10FULL)
                hp->sw_advertise |= (ADVERTISE_10FULL);
        else
                hp->sw_advertise &= ~(ADVERTISE_10FULL);
        if (hp->sw_bmsr & BMSR_100HALF)
                hp->sw_advertise |= (ADVERTISE_100HALF);
        else
                hp->sw_advertise &= ~(ADVERTISE_100HALF);
        if (hp->sw_bmsr & BMSR_100FULL)
                hp->sw_advertise |= (ADVERTISE_100FULL);
        else
                hp->sw_advertise &= ~(ADVERTISE_100FULL);

        /* Update the PHY advertisement register. */
        happy_meal_tcvr_write(hp, tregs, MII_ADVERTISE, hp->sw_advertise);
}

/* Once status is latched (by happy_meal_interrupt) it is cleared by
 * the hardware, so we cannot re-read it and get a correct value.
 *
 * hp->happy_lock must be held
 */
static int happy_meal_is_not_so_happy(struct happy_meal *hp, u32 status)
{
        int reset = 0;

        /* Only print messages for non-counter related interrupts. */
        if (status & (GREG_STAT_STSTERR | GREG_STAT_TFIFO_UND |
                      GREG_STAT_MAXPKTERR | GREG_STAT_RXERR |
                      GREG_STAT_RXPERR | GREG_STAT_RXTERR | GREG_STAT_EOPERR |
                      GREG_STAT_MIFIRQ | GREG_STAT_TXEACK | GREG_STAT_TXLERR |
                      GREG_STAT_TXPERR | GREG_STAT_TXTERR | GREG_STAT_SLVERR |
                      GREG_STAT_SLVPERR))
                printk(KERN_ERR "%s: Error interrupt for happy meal, status = %08x\n",
                       hp->dev->name, status);

        if (status & GREG_STAT_RFIFOVF) {
                /* Receive FIFO overflow is harmless and the hardware will take
                   care of it, just some packets are lost. Who cares. */
                printk(KERN_DEBUG "%s: Happy Meal receive FIFO overflow.\n", hp->dev->name);
        }

        if (status & GREG_STAT_STSTERR) {
                /* BigMAC SQE link test failed. */
                printk(KERN_ERR "%s: Happy Meal BigMAC SQE test failed.\n", hp->dev->name);
                reset = 1;
        }

        if (status & GREG_STAT_TFIFO_UND) {
                /* Transmit FIFO underrun, again DMA error likely. */
                printk(KERN_ERR "%s: Happy Meal transmitter FIFO underrun, DMA error.\n",
                       hp->dev->name);
                reset = 1;
        }

        if (status & GREG_STAT_MAXPKTERR) {
                /* Driver error, tried to transmit something larger
                 * than ethernet max mtu.
                 */
                printk(KERN_ERR "%s: Happy Meal MAX Packet size error.\n", hp->dev->name);
                reset = 1;
        }

        if (status & GREG_STAT_NORXD) {
                /* This is harmless, it just means the system is
                 * quite loaded and the incoming packet rate was
                 * faster than the interrupt handler could keep up
                 * with.
                 */
                printk(KERN_INFO "%s: Happy Meal out of receive "
                       "descriptors, packet dropped.\n",
                       hp->dev->name);
        }

        if (status & (GREG_STAT_RXERR|GREG_STAT_RXPERR|GREG_STAT_RXTERR)) {
                /* All sorts of DMA receive errors. */
                printk(KERN_ERR "%s: Happy Meal rx DMA errors [ ", hp->dev->name);
                if (status & GREG_STAT_RXERR)
                        printk("GenericError ");
                if (status & GREG_STAT_RXPERR)
                        printk("ParityError ");
                if (status & GREG_STAT_RXTERR)
                        printk("RxTagBotch ");
                printk("]\n");
                reset = 1;
        }

        if (status & GREG_STAT_EOPERR) {
                /* Driver bug, didn't set EOP bit in tx descriptor given
                 * to the happy meal.
                 */
                printk(KERN_ERR "%s: EOP not set in happy meal transmit descriptor!\n",
                       hp->dev->name);
                reset = 1;
        }

        if (status & GREG_STAT_MIFIRQ) {
                /* MIF signalled an interrupt, were we polling it? */
                printk(KERN_ERR "%s: Happy Meal MIF interrupt.\n", hp->dev->name);
        }

        if (status &
            (GREG_STAT_TXEACK|GREG_STAT_TXLERR|GREG_STAT_TXPERR|GREG_STAT_TXTERR)) {
                /* All sorts of transmit DMA errors. */
                printk(KERN_ERR "%s: Happy Meal tx DMA errors [ ", hp->dev->name);
                if (status & GREG_STAT_TXEACK)
                        printk("GenericError ");
                if (status & GREG_STAT_TXLERR)
                        printk("LateError ");
                if (status & GREG_STAT_TXPERR)
                        printk("ParityError ");
                if (status & GREG_STAT_TXTERR)
                        printk("TagBotch ");
                printk("]\n");
                reset = 1;
        }

        if (status & (GREG_STAT_SLVERR|GREG_STAT_SLVPERR)) {
                /* Bus or parity error when cpu accessed happy meal registers
                 * or it's internal FIFO's.  Should never see this.
                 */
                printk(KERN_ERR "%s: Happy Meal register access SBUS slave (%s) error.\n",
                       hp->dev->name,
                       (status & GREG_STAT_SLVPERR) ? "parity" : "generic");
                reset = 1;
        }

        if (reset) {
                printk(KERN_NOTICE "%s: Resetting...\n", hp->dev->name);
                happy_meal_init(hp);
                return 1;
        }
        return 0;
}

/* hp->happy_lock must be held */
static void happy_meal_mif_interrupt(struct happy_meal *hp)
{
        void __iomem *tregs = hp->tcvregs;

        printk(KERN_INFO "%s: Link status change.\n", hp->dev->name);
        hp->sw_bmcr = happy_meal_tcvr_read(hp, tregs, MII_BMCR);
        hp->sw_lpa = happy_meal_tcvr_read(hp, tregs, MII_LPA);

        /* Use the fastest transmission protocol possible. */
        if (hp->sw_lpa & LPA_100FULL) {
                printk(KERN_INFO "%s: Switching to 100Mbps at full duplex.", hp->dev->name);
                hp->sw_bmcr |= (BMCR_FULLDPLX | BMCR_SPEED100);
        } else if (hp->sw_lpa & LPA_100HALF) {
                printk(KERN_INFO "%s: Switching to 100MBps at half duplex.", hp->dev->name);
                hp->sw_bmcr |= BMCR_SPEED100;
        } else if (hp->sw_lpa & LPA_10FULL) {
                printk(KERN_INFO "%s: Switching to 10MBps at full duplex.", hp->dev->name);
                hp->sw_bmcr |= BMCR_FULLDPLX;
        } else {
                printk(KERN_INFO "%s: Using 10Mbps at half duplex.", hp->dev->name);
        }
        happy_meal_tcvr_write(hp, tregs, MII_BMCR, hp->sw_bmcr);

        /* Finally stop polling and shut up the MIF. */
        happy_meal_poll_stop(hp, tregs);
}

#ifdef TXDEBUG
#define TXD(x) printk x
#else
#define TXD(x)
#endif

/* hp->happy_lock must be held */
static void happy_meal_tx(struct happy_meal *hp)
{
        struct happy_meal_txd *txbase = &hp->happy_block->happy_meal_txd[0];
        struct happy_meal_txd *this;
        struct net_device *dev = hp->dev;
        int elem;

        elem = hp->tx_old;
        TXD(("TX<"));
        while (elem != hp->tx_new) {
                struct sk_buff *skb;
                u32 flags, dma_addr, dma_len;
                int frag;

                TXD(("[%d]", elem));
                this = &txbase[elem];
                flags = hme_read_desc32(hp, &this->tx_flags);
                if (flags & TXFLAG_OWN)
                        break;
                skb = hp->tx_skbs[elem];
                if (skb_shinfo(skb)->nr_frags) {
                        int last;

                        last = elem + skb_shinfo(skb)->nr_frags;
                        last &= (TX_RING_SIZE - 1);
                        flags = hme_read_desc32(hp, &txbase[last].tx_flags);
                        if (flags & TXFLAG_OWN)
                                break;
                }
                hp->tx_skbs[elem] = NULL;
                dev->stats.tx_bytes += skb->len;

                for (frag = 0; frag <= skb_shinfo(skb)->nr_frags; frag++) {
                        dma_addr = hme_read_desc32(hp, &this->tx_addr);
                        dma_len = hme_read_desc32(hp, &this->tx_flags);

                        dma_len &= TXFLAG_SIZE;
                        if (!frag)
                                dma_unmap_single(hp->dma_dev, dma_addr, dma_len, DMA_TO_DEVICE);
                        else
                                dma_unmap_page(hp->dma_dev, dma_addr, dma_len, DMA_TO_DEVICE);

                        elem = NEXT_TX(elem);
                        this = &txbase[elem];
                }

                dev_kfree_skb_irq(skb);
                dev->stats.tx_packets++;
        }
        hp->tx_old = elem;
        TXD((">"));

        if (netif_queue_stopped(dev) &&
            TX_BUFFS_AVAIL(hp) > (MAX_SKB_FRAGS + 1))
                netif_wake_queue(dev);
}

#ifdef RXDEBUG
#define RXD(x) printk x
#else
#define RXD(x)
#endif

/* Originally I used to handle the allocation failure by just giving back just
 * that one ring buffer to the happy meal.  Problem is that usually when that
 * condition is triggered, the happy meal expects you to do something reasonable
 * with all of the packets it has DMA'd in.  So now I just drop the entire
 * ring when we cannot get a new skb and give them all back to the happy meal,
 * maybe things will be "happier" now.
 *
 * hp->happy_lock must be held
 */
static void happy_meal_rx(struct happy_meal *hp, struct net_device *dev)
{
        struct happy_meal_rxd *rxbase = &hp->happy_block->happy_meal_rxd[0];
        struct happy_meal_rxd *this;
        int elem = hp->rx_new, drops = 0;
        u32 flags;

        RXD(("RX<"));
        this = &rxbase[elem];
        while (!((flags = hme_read_desc32(hp, &this->rx_flags)) & RXFLAG_OWN)) {

                struct sk_buff *skb;
                int len = flags >> 16;
                u16 csum = flags & RXFLAG_CSUM;
                u32 dma_addr = hme_read_desc32(hp, &this->rx_addr);

                RXD(("[%d ", elem));

                /* Check for errors. */
                if ((len < ETH_ZLEN) || (flags & RXFLAG_OVERFLOW)) {
                        RXD(("ERR(%08x)]", flags));
                        dev->stats.rx_errors++;
                        if (len < ETH_ZLEN)
                                dev->stats.rx_length_errors++;
                        if (len & (RXFLAG_OVERFLOW >> 16)) {
                                dev->stats.rx_over_errors++;
                                dev->stats.rx_fifo_errors++;
                        }

                        /* Return it to the Happy meal. */
        drop_it:
                        dev->stats.rx_dropped++;
                        hme_write_rxd(hp, this,
                                      (RXFLAG_OWN|((RX_BUF_ALLOC_SIZE-RX_OFFSET)<<16)),
                                      dma_addr);
                        goto next;
                }
                skb = hp->rx_skbs[elem];
                if (len > RX_COPY_THRESHOLD) {
                        struct sk_buff *new_skb;
                        u32 mapping;

                        /* Now refill the entry, if we can. */
                        new_skb = happy_meal_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
                        if (new_skb == NULL) {
                                drops++;
                                goto drop_it;
                        }
                        skb_put(new_skb, (ETH_FRAME_LEN + RX_OFFSET + 4));
                        mapping = dma_map_single(hp->dma_dev, new_skb->data,
                                                 RX_BUF_ALLOC_SIZE,
                                                 DMA_FROM_DEVICE);
                        if (unlikely(dma_mapping_error(hp->dma_dev, mapping))) {
                                dev_kfree_skb_any(new_skb);
                                drops++;
                                goto drop_it;
                        }

                        dma_unmap_single(hp->dma_dev, dma_addr, RX_BUF_ALLOC_SIZE, DMA_FROM_DEVICE);
                        hp->rx_skbs[elem] = new_skb;
                        hme_write_rxd(hp, this,
                                      (RXFLAG_OWN|((RX_BUF_ALLOC_SIZE-RX_OFFSET)<<16)),
                                      mapping);
                        skb_reserve(new_skb, RX_OFFSET);

                        /* Trim the original skb for the netif. */
                        skb_trim(skb, len);
                } else {
                        struct sk_buff *copy_skb = netdev_alloc_skb(dev, len + 2);

                        if (copy_skb == NULL) {
                                drops++;
                                goto drop_it;
                        }

                        skb_reserve(copy_skb, 2);
                        skb_put(copy_skb, len);
                        dma_sync_single_for_cpu(hp->dma_dev, dma_addr, len, DMA_FROM_DEVICE);
                        skb_copy_from_linear_data(skb, copy_skb->data, len);
                        dma_sync_single_for_device(hp->dma_dev, dma_addr, len, DMA_FROM_DEVICE);
                        /* Reuse original ring buffer. */
                        hme_write_rxd(hp, this,
                                      (RXFLAG_OWN|((RX_BUF_ALLOC_SIZE-RX_OFFSET)<<16)),
                                      dma_addr);

                        skb = copy_skb;
                }

                /* This card is _fucking_ hot... */
                skb->csum = csum_unfold(~(__force __sum16)htons(csum));
                skb->ip_summed = CHECKSUM_COMPLETE;

                RXD(("len=%d csum=%4x]", len, csum));
                skb->protocol = eth_type_trans(skb, dev);
                netif_rx(skb);

                dev->stats.rx_packets++;
                dev->stats.rx_bytes += len;
        next:
                elem = NEXT_RX(elem);
                this = &rxbase[elem];
        }
        hp->rx_new = elem;
        if (drops)
                printk(KERN_INFO "%s: Memory squeeze, deferring packet.\n", hp->dev->name);
        RXD((">"));
}

static irqreturn_t happy_meal_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct happy_meal *hp  = netdev_priv(dev);
        u32 happy_status       = hme_read32(hp, hp->gregs + GREG_STAT);

        HMD(("happy_meal_interrupt: status=%08x ", happy_status));

        spin_lock(&hp->happy_lock);

        if (happy_status & GREG_STAT_ERRORS) {
                HMD(("ERRORS "));
                if (happy_meal_is_not_so_happy(hp, /* un- */ happy_status))
                        goto out;
        }

        if (happy_status & GREG_STAT_MIFIRQ) {
                HMD(("MIFIRQ "));
                happy_meal_mif_interrupt(hp);
        }

        if (happy_status & GREG_STAT_TXALL) {
                HMD(("TXALL "));
                happy_meal_tx(hp);
        }

        if (happy_status & GREG_STAT_RXTOHOST) {
                HMD(("RXTOHOST "));
                happy_meal_rx(hp, dev);
        }

        HMD(("done\n"));
out:
        spin_unlock(&hp->happy_lock);

        return IRQ_HANDLED;
}

#ifdef CONFIG_SBUS
static irqreturn_t quattro_sbus_interrupt(int irq, void *cookie)
{
        struct quattro *qp = (struct quattro *) cookie;
        int i;

        for (i = 0; i < 4; i++) {
                struct net_device *dev = qp->happy_meals[i];
                struct happy_meal *hp  = netdev_priv(dev);
                u32 happy_status       = hme_read32(hp, hp->gregs + GREG_STAT);

                HMD(("quattro_interrupt: status=%08x ", happy_status));

                if (!(happy_status & (GREG_STAT_ERRORS |
                                      GREG_STAT_MIFIRQ |
                                      GREG_STAT_TXALL |
                                      GREG_STAT_RXTOHOST)))
                        continue;

                spin_lock(&hp->happy_lock);

                if (happy_status & GREG_STAT_ERRORS) {
                        HMD(("ERRORS "));
                        if (happy_meal_is_not_so_happy(hp, happy_status))
                                goto next;
                }

                if (happy_status & GREG_STAT_MIFIRQ) {
                        HMD(("MIFIRQ "));
                        happy_meal_mif_interrupt(hp);
                }

                if (happy_status & GREG_STAT_TXALL) {
                        HMD(("TXALL "));
                        happy_meal_tx(hp);
                }

                if (happy_status & GREG_STAT_RXTOHOST) {
                        HMD(("RXTOHOST "));
                        happy_meal_rx(hp, dev);
                }

        next:
                spin_unlock(&hp->happy_lock);
        }
        HMD(("done\n"));

        return IRQ_HANDLED;
}
#endif

static int happy_meal_open(struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);
        int res;

        HMD(("happy_meal_open: "));

        /* On SBUS Quattro QFE cards, all hme interrupts are concentrated
         * into a single source which we register handling at probe time.
         */
        if ((hp->happy_flags & (HFLAG_QUATTRO|HFLAG_PCI)) != HFLAG_QUATTRO) {
                res = request_irq(hp->irq, happy_meal_interrupt, IRQF_SHARED,
                                  dev->name, dev);
                if (res) {
                        HMD(("EAGAIN\n"));
                        printk(KERN_ERR "happy_meal(SBUS): Can't order irq %d to go.\n",
                               hp->irq);

                        return -EAGAIN;
                }
        }

        HMD(("to happy_meal_init\n"));

        spin_lock_irq(&hp->happy_lock);
        res = happy_meal_init(hp);
        spin_unlock_irq(&hp->happy_lock);

        if (res && ((hp->happy_flags & (HFLAG_QUATTRO|HFLAG_PCI)) != HFLAG_QUATTRO))
                free_irq(hp->irq, dev);
        return res;
}

static int happy_meal_close(struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);

        spin_lock_irq(&hp->happy_lock);
        happy_meal_stop(hp, hp->gregs);
        happy_meal_clean_rings(hp);

        /* If auto-negotiation timer is running, kill it. */
        del_timer(&hp->happy_timer);

        spin_unlock_irq(&hp->happy_lock);

        /* On Quattro QFE cards, all hme interrupts are concentrated
         * into a single source which we register handling at probe
         * time and never unregister.
         */
        if ((hp->happy_flags & (HFLAG_QUATTRO|HFLAG_PCI)) != HFLAG_QUATTRO)
                free_irq(hp->irq, dev);

        return 0;
}

#ifdef SXDEBUG
#define SXD(x) printk x
#else
#define SXD(x)
#endif

static void happy_meal_tx_timeout(struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);

        printk (KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
        tx_dump_log();
        printk (KERN_ERR "%s: Happy Status %08x TX[%08x:%08x]\n", dev->name,
                hme_read32(hp, hp->gregs + GREG_STAT),
                hme_read32(hp, hp->etxregs + ETX_CFG),
                hme_read32(hp, hp->bigmacregs + BMAC_TXCFG));

        spin_lock_irq(&hp->happy_lock);
        happy_meal_init(hp);
        spin_unlock_irq(&hp->happy_lock);

        netif_wake_queue(dev);
}

static void unmap_partial_tx_skb(struct happy_meal *hp, u32 first_mapping,
                                 u32 first_len, u32 first_entry, u32 entry)
{
        struct happy_meal_txd *txbase = &hp->happy_block->happy_meal_txd[0];

        dma_unmap_single(hp->dma_dev, first_mapping, first_len, DMA_TO_DEVICE);

        first_entry = NEXT_TX(first_entry);
        while (first_entry != entry) {
                struct happy_meal_txd *this = &txbase[first_entry];
                u32 addr, len;

                addr = hme_read_desc32(hp, &this->tx_addr);
                len = hme_read_desc32(hp, &this->tx_flags);
                len &= TXFLAG_SIZE;
                dma_unmap_page(hp->dma_dev, addr, len, DMA_TO_DEVICE);
        }
}

static netdev_tx_t happy_meal_start_xmit(struct sk_buff *skb,
                                         struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);
        int entry;
        u32 tx_flags;

        tx_flags = TXFLAG_OWN;
        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                const u32 csum_start_off = skb_checksum_start_offset(skb);
                const u32 csum_stuff_off = csum_start_off + skb->csum_offset;

                tx_flags = (TXFLAG_OWN | TXFLAG_CSENABLE |
                            ((csum_start_off << 14) & TXFLAG_CSBUFBEGIN) |
                            ((csum_stuff_off << 20) & TXFLAG_CSLOCATION));
        }

        spin_lock_irq(&hp->happy_lock);

        if (TX_BUFFS_AVAIL(hp) <= (skb_shinfo(skb)->nr_frags + 1)) {
                netif_stop_queue(dev);
                spin_unlock_irq(&hp->happy_lock);
                printk(KERN_ERR "%s: BUG! Tx Ring full when queue awake!\n",
                       dev->name);
                return NETDEV_TX_BUSY;
        }

        entry = hp->tx_new;
        SXD(("SX<l[%d]e[%d]>", len, entry));
        hp->tx_skbs[entry] = skb;

        if (skb_shinfo(skb)->nr_frags == 0) {
                u32 mapping, len;

                len = skb->len;
                mapping = dma_map_single(hp->dma_dev, skb->data, len, DMA_TO_DEVICE);
                if (unlikely(dma_mapping_error(hp->dma_dev, mapping)))
                        goto out_dma_error;
                tx_flags |= (TXFLAG_SOP | TXFLAG_EOP);
                hme_write_txd(hp, &hp->happy_block->happy_meal_txd[entry],
                              (tx_flags | (len & TXFLAG_SIZE)),
                              mapping);
                entry = NEXT_TX(entry);
        } else {
                u32 first_len, first_mapping;
                int frag, first_entry = entry;

                /* We must give this initial chunk to the device last.
                 * Otherwise we could race with the device.
                 */
                first_len = skb_headlen(skb);
                first_mapping = dma_map_single(hp->dma_dev, skb->data, first_len,
                                               DMA_TO_DEVICE);
                if (unlikely(dma_mapping_error(hp->dma_dev, first_mapping)))
                        goto out_dma_error;
                entry = NEXT_TX(entry);

                for (frag = 0; frag < skb_shinfo(skb)->nr_frags; frag++) {
                        const skb_frag_t *this_frag = &skb_shinfo(skb)->frags[frag];
                        u32 len, mapping, this_txflags;

                        len = skb_frag_size(this_frag);
                        mapping = skb_frag_dma_map(hp->dma_dev, this_frag,
                                                   0, len, DMA_TO_DEVICE);
                        if (unlikely(dma_mapping_error(hp->dma_dev, mapping))) {
                                unmap_partial_tx_skb(hp, first_mapping, first_len,
                                                     first_entry, entry);
                                goto out_dma_error;
                        }
                        this_txflags = tx_flags;
                        if (frag == skb_shinfo(skb)->nr_frags - 1)
                                this_txflags |= TXFLAG_EOP;
                        hme_write_txd(hp, &hp->happy_block->happy_meal_txd[entry],
                                      (this_txflags | (len & TXFLAG_SIZE)),
                                      mapping);
                        entry = NEXT_TX(entry);
                }
                hme_write_txd(hp, &hp->happy_block->happy_meal_txd[first_entry],
                              (tx_flags | TXFLAG_SOP | (first_len & TXFLAG_SIZE)),
                              first_mapping);
        }

        hp->tx_new = entry;

        if (TX_BUFFS_AVAIL(hp) <= (MAX_SKB_FRAGS + 1))
                netif_stop_queue(dev);

        /* Get it going. */
        hme_write32(hp, hp->etxregs + ETX_PENDING, ETX_TP_DMAWAKEUP);

        spin_unlock_irq(&hp->happy_lock);

        tx_add_log(hp, TXLOG_ACTION_TXMIT, 0);
        return NETDEV_TX_OK;

out_dma_error:
        hp->tx_skbs[hp->tx_new] = NULL;
        spin_unlock_irq(&hp->happy_lock);

        dev_kfree_skb_any(skb);
        dev->stats.tx_dropped++;
        return NETDEV_TX_OK;
}

static struct net_device_stats *happy_meal_get_stats(struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);

        spin_lock_irq(&hp->happy_lock);
        happy_meal_get_counters(hp, hp->bigmacregs);
        spin_unlock_irq(&hp->happy_lock);

        return &dev->stats;
}

static void happy_meal_set_multicast(struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);
        void __iomem *bregs = hp->bigmacregs;
        struct netdev_hw_addr *ha;
        u32 crc;

        spin_lock_irq(&hp->happy_lock);

        if ((dev->flags & IFF_ALLMULTI) || (netdev_mc_count(dev) > 64)) {
                hme_write32(hp, bregs + BMAC_HTABLE0, 0xffff);
                hme_write32(hp, bregs + BMAC_HTABLE1, 0xffff);
                hme_write32(hp, bregs + BMAC_HTABLE2, 0xffff);
                hme_write32(hp, bregs + BMAC_HTABLE3, 0xffff);
        } else if (dev->flags & IFF_PROMISC) {
                hme_write32(hp, bregs + BMAC_RXCFG,
                            hme_read32(hp, bregs + BMAC_RXCFG) | BIGMAC_RXCFG_PMISC);
        } else {
                u16 hash_table[4];

                memset(hash_table, 0, sizeof(hash_table));
                netdev_for_each_mc_addr(ha, dev) {
                        crc = ether_crc_le(6, ha->addr);
                        crc >>= 26;
                        hash_table[crc >> 4] |= 1 << (crc & 0xf);
                }
                hme_write32(hp, bregs + BMAC_HTABLE0, hash_table[0]);
                hme_write32(hp, bregs + BMAC_HTABLE1, hash_table[1]);
                hme_write32(hp, bregs + BMAC_HTABLE2, hash_table[2]);
                hme_write32(hp, bregs + BMAC_HTABLE3, hash_table[3]);
        }

        spin_unlock_irq(&hp->happy_lock);
}

/* Ethtool support... */
static int hme_get_link_ksettings(struct net_device *dev,
                                  struct ethtool_link_ksettings *cmd)
{
        struct happy_meal *hp = netdev_priv(dev);
        u32 speed;
        u32 supported;

        supported =
                (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
                 SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
                 SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII);

        /* XXX hardcoded stuff for now */
        cmd->base.port = PORT_TP; /* XXX no MII support */
        cmd->base.phy_address = 0; /* XXX fixed PHYAD */

        /* Record PHY settings. */
        spin_lock_irq(&hp->happy_lock);
        hp->sw_bmcr = happy_meal_tcvr_read(hp, hp->tcvregs, MII_BMCR);
        hp->sw_lpa = happy_meal_tcvr_read(hp, hp->tcvregs, MII_LPA);
        spin_unlock_irq(&hp->happy_lock);

        if (hp->sw_bmcr & BMCR_ANENABLE) {
                cmd->base.autoneg = AUTONEG_ENABLE;
                speed = ((hp->sw_lpa & (LPA_100HALF | LPA_100FULL)) ?
                         SPEED_100 : SPEED_10);
                if (speed == SPEED_100)
                        cmd->base.duplex =
                                (hp->sw_lpa & (LPA_100FULL)) ?
                                DUPLEX_FULL : DUPLEX_HALF;
                else
                        cmd->base.duplex =
                                (hp->sw_lpa & (LPA_10FULL)) ?
                                DUPLEX_FULL : DUPLEX_HALF;
        } else {
                cmd->base.autoneg = AUTONEG_DISABLE;
                speed = (hp->sw_bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10;
                cmd->base.duplex =
                        (hp->sw_bmcr & BMCR_FULLDPLX) ?
                        DUPLEX_FULL : DUPLEX_HALF;
        }
        cmd->base.speed = speed;
        ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
                                                supported);

        return 0;
}

static int hme_set_link_ksettings(struct net_device *dev,
                                  const struct ethtool_link_ksettings *cmd)
{
        struct happy_meal *hp = netdev_priv(dev);

        /* Verify the settings we care about. */
        if (cmd->base.autoneg != AUTONEG_ENABLE &&
            cmd->base.autoneg != AUTONEG_DISABLE)
                return -EINVAL;
        if (cmd->base.autoneg == AUTONEG_DISABLE &&
            ((cmd->base.speed != SPEED_100 &&
              cmd->base.speed != SPEED_10) ||
             (cmd->base.duplex != DUPLEX_HALF &&
              cmd->base.duplex != DUPLEX_FULL)))
                return -EINVAL;

        /* Ok, do it to it. */
        spin_lock_irq(&hp->happy_lock);
        del_timer(&hp->happy_timer);
        happy_meal_begin_auto_negotiation(hp, hp->tcvregs, cmd);
        spin_unlock_irq(&hp->happy_lock);

        return 0;
}

static void hme_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
{
        struct happy_meal *hp = netdev_priv(dev);

        strlcpy(info->driver, "sunhme", sizeof(info->driver));
        strlcpy(info->version, "2.02", sizeof(info->version));
        if (hp->happy_flags & HFLAG_PCI) {
                struct pci_dev *pdev = hp->happy_dev;
                strlcpy(info->bus_info, pci_name(pdev), sizeof(info->bus_info));
        }
#ifdef CONFIG_SBUS
        else {
                const struct linux_prom_registers *regs;
                struct platform_device *op = hp->happy_dev;
                regs = of_get_property(op->dev.of_node, "regs", NULL);
                if (regs)
                        snprintf(info->bus_info, sizeof(info->bus_info),
                                "SBUS:%d",
                                regs->which_io);
        }
#endif
}

static u32 hme_get_link(struct net_device *dev)
{
        struct happy_meal *hp = netdev_priv(dev);

        spin_lock_irq(&hp->happy_lock);
        hp->sw_bmcr = happy_meal_tcvr_read(hp, hp->tcvregs, MII_BMCR);
        spin_unlock_irq(&hp->happy_lock);

        return hp->sw_bmsr & BMSR_LSTATUS;
}

static const struct ethtool_ops hme_ethtool_ops = {
        .get_drvinfo            = hme_get_drvinfo,
        .get_link               = hme_get_link,
        .get_link_ksettings     = hme_get_link_ksettings,
        .set_link_ksettings     = hme_set_link_ksettings,
};

static int hme_version_printed;

#ifdef CONFIG_SBUS
/* Given a happy meal sbus device, find it's quattro parent.
 * If none exist, allocate and return a new one.
 *
 * Return NULL on failure.
 */
static struct quattro *quattro_sbus_find(struct platform_device *child)
{
        struct device *parent = child->dev.parent;
        struct platform_device *op;
        struct quattro *qp;

        op = to_platform_device(parent);
        qp = platform_get_drvdata(op);
        if (qp)
                return qp;

        qp = kmalloc(sizeof(struct quattro), GFP_KERNEL);
        if (qp != NULL) {
                int i;

                for (i = 0; i < 4; i++)
                        qp->happy_meals[i] = NULL;

                qp->quattro_dev = child;
                qp->next = qfe_sbus_list;
                qfe_sbus_list = qp;

                platform_set_drvdata(op, qp);
        }
        return qp;
}

/* After all quattro cards have been probed, we call these functions
 * to register the IRQ handlers for the cards that have been
 * successfully probed and skip the cards that failed to initialize
 */
static int __init quattro_sbus_register_irqs(void)
{
        struct quattro *qp;

        for (qp = qfe_sbus_list; qp != NULL; qp = qp->next) {
                struct platform_device *op = qp->quattro_dev;
                int err, qfe_slot, skip = 0;

                for (qfe_slot = 0; qfe_slot < 4; qfe_slot++) {
                        if (!qp->happy_meals[qfe_slot])
                                skip = 1;
                }
                if (skip)
                        continue;

                err = request_irq(op->archdata.irqs[0],
                                  quattro_sbus_interrupt,
                                  IRQF_SHARED, "Quattro",
                                  qp);
                if (err != 0) {
                        printk(KERN_ERR "Quattro HME: IRQ registration "
                               "error %d.\n", err);
                        return err;
                }
        }

        return 0;
}

static void quattro_sbus_free_irqs(void)
{
        struct quattro *qp;

        for (qp = qfe_sbus_list; qp != NULL; qp = qp->next) {
                struct platform_device *op = qp->quattro_dev;
                int qfe_slot, skip = 0;

                for (qfe_slot = 0; qfe_slot < 4; qfe_slot++) {
                        if (!qp->happy_meals[qfe_slot])
                                skip = 1;
                }
                if (skip)
                        continue;

                free_irq(op->archdata.irqs[0], qp);
        }
}
#endif /* CONFIG_SBUS */

#ifdef CONFIG_PCI
static struct quattro *quattro_pci_find(struct pci_dev *pdev)
{
        struct pci_dev *bdev = pdev->bus->self;
        struct quattro *qp;

        if (!bdev) return NULL;
        for (qp = qfe_pci_list; qp != NULL; qp = qp->next) {
                struct pci_dev *qpdev = qp->quattro_dev;

                if (qpdev == bdev)
                        return qp;
        }
        qp = kmalloc(sizeof(struct quattro), GFP_KERNEL);
        if (qp != NULL) {
                int i;

                for (i = 0; i < 4; i++)
                        qp->happy_meals[i] = NULL;

                qp->quattro_dev = bdev;
                qp->next = qfe_pci_list;
                qfe_pci_list = qp;

                /* No range tricks necessary on PCI. */
                qp->nranges = 0;
        }
        return qp;
}
#endif /* CONFIG_PCI */

static const struct net_device_ops hme_netdev_ops = {
        .ndo_open               = happy_meal_open,
        .ndo_stop               = happy_meal_close,
        .ndo_start_xmit         = happy_meal_start_xmit,
        .ndo_tx_timeout         = happy_meal_tx_timeout,
        .ndo_get_stats          = happy_meal_get_stats,
        .ndo_set_rx_mode        = happy_meal_set_multicast,
        .ndo_set_mac_address    = eth_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
};

#ifdef CONFIG_SBUS
static int happy_meal_sbus_probe_one(struct platform_device *op, int is_qfe)
{
        struct device_node *dp = op->dev.of_node, *sbus_dp;
        struct quattro *qp = NULL;
        struct happy_meal *hp;
        struct net_device *dev;
        int i, qfe_slot = -1;
        int err = -ENODEV;

        sbus_dp = op->dev.parent->of_node;

        /* We can match PCI devices too, do not accept those here. */
        if (strcmp(sbus_dp->name, "sbus") && strcmp(sbus_dp->name, "sbi"))
                return err;

        if (is_qfe) {
                qp = quattro_sbus_find(op);
                if (qp == NULL)
                        goto err_out;
                for (qfe_slot = 0; qfe_slot < 4; qfe_slot++)
                        if (qp->happy_meals[qfe_slot] == NULL)
                                break;
                if (qfe_slot == 4)
                        goto err_out;
        }

        err = -ENOMEM;
        dev = alloc_etherdev(sizeof(struct happy_meal));
        if (!dev)
                goto err_out;
        SET_NETDEV_DEV(dev, &op->dev);

        if (hme_version_printed++ == 0)
                printk(KERN_INFO "%s", version);

        /* If user did not specify a MAC address specifically, use
         * the Quattro local-mac-address property...
         */
        for (i = 0; i < 6; i++) {
                if (macaddr[i] != 0)
                        break;
        }
        if (i < 6) { /* a mac address was given */
                for (i = 0; i < 6; i++)
                        dev->dev_addr[i] = macaddr[i];
                macaddr[5]++;
        } else {
                const unsigned char *addr;
                int len;

                addr = of_get_property(dp, "local-mac-address", &len);

                if (qfe_slot != -1 && addr && len == ETH_ALEN)
                        memcpy(dev->dev_addr, addr, ETH_ALEN);
                else
                        memcpy(dev->dev_addr, idprom->id_ethaddr, ETH_ALEN);
        }

        hp = netdev_priv(dev);

        hp->happy_dev = op;
        hp->dma_dev = &op->dev;

        spin_lock_init(&hp->happy_lock);

        err = -ENODEV;
        if (qp != NULL) {
                hp->qfe_parent = qp;
                hp->qfe_ent = qfe_slot;
                qp->happy_meals[qfe_slot] = dev;
        }

        hp->gregs = of_ioremap(&op->resource[0], 0,
                               GREG_REG_SIZE, "HME Global Regs");
        if (!hp->gregs) {
                printk(KERN_ERR "happymeal: Cannot map global registers.\n");
                goto err_out_free_netdev;
        }

        hp->etxregs = of_ioremap(&op->resource[1], 0,
                                 ETX_REG_SIZE, "HME TX Regs");
        if (!hp->etxregs) {
                printk(KERN_ERR "happymeal: Cannot map MAC TX registers.\n");
                goto err_out_iounmap;
        }

        hp->erxregs = of_ioremap(&op->resource[2], 0,
                                 ERX_REG_SIZE, "HME RX Regs");
        if (!hp->erxregs) {
                printk(KERN_ERR "happymeal: Cannot map MAC RX registers.\n");
                goto err_out_iounmap;
        }

        hp->bigmacregs = of_ioremap(&op->resource[3], 0,
                                    BMAC_REG_SIZE, "HME BIGMAC Regs");
        if (!hp->bigmacregs) {
                printk(KERN_ERR "happymeal: Cannot map BIGMAC registers.\n");
                goto err_out_iounmap;
        }

        hp->tcvregs = of_ioremap(&op->resource[4], 0,
                                 TCVR_REG_SIZE, "HME Tranceiver Regs");
        if (!hp->tcvregs) {
                printk(KERN_ERR "happymeal: Cannot map TCVR registers.\n");
                goto err_out_iounmap;
        }

        hp->hm_revision = of_getintprop_default(dp, "hm-rev", 0xff);
        if (hp->hm_revision == 0xff)
                hp->hm_revision = 0xa0;

        /* Now enable the feature flags we can. */
        if (hp->hm_revision == 0x20 || hp->hm_revision == 0x21)
                hp->happy_flags = HFLAG_20_21;
        else if (hp->hm_revision != 0xa0)
                hp->happy_flags = HFLAG_NOT_A0;

        if (qp != NULL)
                hp->happy_flags |= HFLAG_QUATTRO;

        /* Get the supported DVMA burst sizes from our Happy SBUS. */
        hp->happy_bursts = of_getintprop_default(sbus_dp,
                                                 "burst-sizes", 0x00);

        hp->happy_block = dma_alloc_coherent(hp->dma_dev,
                                             PAGE_SIZE,
                                             &hp->hblock_dvma,
                                             GFP_ATOMIC);
        err = -ENOMEM;
        if (!hp->happy_block)
                goto err_out_iounmap;

        /* Force check of the link first time we are brought up. */
        hp->linkcheck = 0;

        /* Force timer state to 'asleep' with count of zero. */
        hp->timer_state = asleep;
        hp->timer_ticks = 0;

        timer_setup(&hp->happy_timer, happy_meal_timer, 0);

        hp->dev = dev;
        dev->netdev_ops = &hme_netdev_ops;
        dev->watchdog_timeo = 5*HZ;
        dev->ethtool_ops = &hme_ethtool_ops;

        /* Happy Meal can do it all... */
        dev->hw_features = NETIF_F_SG | NETIF_F_HW_CSUM;
        dev->features |= dev->hw_features | NETIF_F_RXCSUM;

        hp->irq = op->archdata.irqs[0];

#if defined(CONFIG_SBUS) && defined(CONFIG_PCI)
        /* Hook up SBUS register/descriptor accessors. */
        hp->read_desc32 = sbus_hme_read_desc32;
        hp->write_txd = sbus_hme_write_txd;
        hp->write_rxd = sbus_hme_write_rxd;
        hp->read32 = sbus_hme_read32;
        hp->write32 = sbus_hme_write32;
#endif

        /* Grrr, Happy Meal comes up by default not advertising
         * full duplex 100baseT capabilities, fix this.
         */
        spin_lock_irq(&hp->happy_lock);
        happy_meal_set_initial_advertisement(hp);
        spin_unlock_irq(&hp->happy_lock);

        err = register_netdev(hp->dev);
        if (err) {
                printk(KERN_ERR "happymeal: Cannot register net device, "
                       "aborting.\n");
                goto err_out_free_coherent;
        }

        platform_set_drvdata(op, hp);

        if (qfe_slot != -1)
                printk(KERN_INFO "%s: Quattro HME slot %d (SBUS) 10/100baseT Ethernet ",
                       dev->name, qfe_slot);
        else
                printk(KERN_INFO "%s: HAPPY MEAL (SBUS) 10/100baseT Ethernet ",
                       dev->name);

        printk("%pM\n", dev->dev_addr);

        return 0;

err_out_free_coherent:
        dma_free_coherent(hp->dma_dev,
                          PAGE_SIZE,
                          hp->happy_block,
                          hp->hblock_dvma);

err_out_iounmap:
        if (hp->gregs)
                of_iounmap(&op->resource[0], hp->gregs, GREG_REG_SIZE);
        if (hp->etxregs)
                of_iounmap(&op->resource[1], hp->etxregs, ETX_REG_SIZE);
        if (hp->erxregs)
                of_iounmap(&op->resource[2], hp->erxregs, ERX_REG_SIZE);
        if (hp->bigmacregs)
                of_iounmap(&op->resource[3], hp->bigmacregs, BMAC_REG_SIZE);
        if (hp->tcvregs)
                of_iounmap(&op->resource[4], hp->tcvregs, TCVR_REG_SIZE);

        if (qp)
                qp->happy_meals[qfe_slot] = NULL;

err_out_free_netdev:
        free_netdev(dev);

err_out:
        return err;
}
#endif

#ifdef CONFIG_PCI
#ifndef CONFIG_SPARC
static int is_quattro_p(struct pci_dev *pdev)
{
        struct pci_dev *busdev = pdev->bus->self;
        struct pci_dev *this_pdev;
        int n_hmes;

        if (busdev == NULL ||
            busdev->vendor != PCI_VENDOR_ID_DEC ||
            busdev->device != PCI_DEVICE_ID_DEC_21153)
                return 0;

        n_hmes = 0;
        list_for_each_entry(this_pdev, &pdev->bus->devices, bus_list) {
                if (this_pdev->vendor == PCI_VENDOR_ID_SUN &&
                    this_pdev->device == PCI_DEVICE_ID_SUN_HAPPYMEAL)
                        n_hmes++;
        }

        if (n_hmes != 4)
                return 0;

        return 1;
}

/* Fetch MAC address from vital product data of PCI ROM. */
static int find_eth_addr_in_vpd(void __iomem *rom_base, int len, int index, unsigned char *dev_addr)
{
        int this_offset;

        for (this_offset = 0x20; this_offset < len; this_offset++) {
                void __iomem *p = rom_base + this_offset;

                if (readb(p + 0) != 0x90 ||
                    readb(p + 1) != 0x00 ||
                    readb(p + 2) != 0x09 ||
                    readb(p + 3) != 0x4e ||
                    readb(p + 4) != 0x41 ||
                    readb(p + 5) != 0x06)
                        continue;

                this_offset += 6;
                p += 6;

                if (index == 0) {
                        int i;

                        for (i = 0; i < 6; i++)
                                dev_addr[i] = readb(p + i);
                        return 1;
                }
                index--;
        }
        return 0;
}

static void get_hme_mac_nonsparc(struct pci_dev *pdev, unsigned char *dev_addr)
{
        size_t size;
        void __iomem *p = pci_map_rom(pdev, &size);

        if (p) {
                int index = 0;
                int found;

                if (is_quattro_p(pdev))
                        index = PCI_SLOT(pdev->devfn);

                found = readb(p) == 0x55 &&
                        readb(p + 1) == 0xaa &&
                        find_eth_addr_in_vpd(p, (64 * 1024), index, dev_addr);
                pci_unmap_rom(pdev, p);
                if (found)
                        return;
        }

        /* Sun MAC prefix then 3 random bytes. */
        dev_addr[0] = 0x08;
        dev_addr[1] = 0x00;
        dev_addr[2] = 0x20;
        get_random_bytes(&dev_addr[3], 3);
}
#endif /* !(CONFIG_SPARC) */

static int happy_meal_pci_probe(struct pci_dev *pdev,
                                const struct pci_device_id *ent)
{
        struct quattro *qp = NULL;
#ifdef CONFIG_SPARC
        struct device_node *dp;
#endif
        struct happy_meal *hp;
        struct net_device *dev;
        void __iomem *hpreg_base;
        unsigned long hpreg_res;
        int i, qfe_slot = -1;
        char prom_name[64];
        int err;

        /* Now make sure pci_dev cookie is there. */
#ifdef CONFIG_SPARC