/*
        drivers/net/ethernet/dec/tulip/pnic.c

        Copyright 2000,2001  The Linux Kernel Team
        Written/copyright 1994-2001 by Donald Becker.

        This software may be used and distributed according to the terms
        of the GNU General Public License, incorporated herein by reference.

        Please submit bugs to http://bugzilla.kernel.org/ .
*/

#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/jiffies.h>
#include "tulip.h"


void pnic_do_nway(struct net_device *dev)
{
        struct tulip_private *tp = netdev_priv(dev);
        void __iomem *ioaddr = tp->base_addr;
        u32 phy_reg = ioread32(ioaddr + 0xB8);
        u32 new_csr6 = tp->csr6 & ~0x40C40200;

        if (phy_reg & 0x78000000) { /* Ignore baseT4 */
                if (phy_reg & 0x20000000)               dev->if_port = 5;
                else if (phy_reg & 0x40000000)  dev->if_port = 3;
                else if (phy_reg & 0x10000000)  dev->if_port = 4;
                else if (phy_reg & 0x08000000)  dev->if_port = 0;
                tp->nwayset = 1;
                new_csr6 = (dev->if_port & 1) ? 0x01860000 : 0x00420000;
                iowrite32(0x32 | (dev->if_port & 1), ioaddr + CSR12);
                if (dev->if_port & 1)
                        iowrite32(0x1F868, ioaddr + 0xB8);
                if (phy_reg & 0x30000000) {
                        tp->full_duplex = 1;
                        new_csr6 |= 0x00000200;
                }
                if (tulip_debug > 1)
                        netdev_dbg(dev, "PNIC autonegotiated status %08x, %s\n",
                                   phy_reg, medianame[dev->if_port]);
                if (tp->csr6 != new_csr6) {
                        tp->csr6 = new_csr6;
                        /* Restart Tx */
                        tulip_restart_rxtx(tp);
                        netif_trans_update(dev);
                }
        }
}

void pnic_lnk_change(struct net_device *dev, int csr5)
{
        struct tulip_private *tp = netdev_priv(dev);
        void __iomem *ioaddr = tp->base_addr;
        int phy_reg = ioread32(ioaddr + 0xB8);

        if (tulip_debug > 1)
                netdev_dbg(dev, "PNIC link changed state %08x, CSR5 %08x\n",
                           phy_reg, csr5);
        if (ioread32(ioaddr + CSR5) & TPLnkFail) {
                iowrite32((ioread32(ioaddr + CSR7) & ~TPLnkFail) | TPLnkPass, ioaddr + CSR7);
                /* If we use an external MII, then we mustn't use the
                 * internal negotiation.
                 */
                if (tulip_media_cap[dev->if_port] & MediaIsMII)
                        return;
                if (! tp->nwayset || time_after(jiffies, dev_trans_start(dev) + 1*HZ)) {
                        tp->csr6 = 0x00420000 | (tp->csr6 & 0x0000fdff);
                        iowrite32(tp->csr6, ioaddr + CSR6);
                        iowrite32(0x30, ioaddr + CSR12);
                        iowrite32(0x0201F078, ioaddr + 0xB8); /* Turn on autonegotiation. */
                        netif_trans_update(dev);
                }
        } else if (ioread32(ioaddr + CSR5) & TPLnkPass) {
                if (tulip_media_cap[dev->if_port] & MediaIsMII) {
                        spin_lock(&tp->lock);
                        tulip_check_duplex(dev);
                        spin_unlock(&tp->lock);
                } else {
                        pnic_do_nway(dev);
                }
                iowrite32((ioread32(ioaddr + CSR7) & ~TPLnkPass) | TPLnkFail, ioaddr + CSR7);
        }
}

void pnic_timer(struct timer_list *t)
{
        struct tulip_private *tp = from_timer(tp, t, timer);
        struct net_device *dev = tp->dev;
        void __iomem *ioaddr = tp->base_addr;
        int next_tick = 60*HZ;

        if(!ioread32(ioaddr + CSR7)) {
                /* the timer was called due to a work overflow
                 * in the interrupt handler. Skip the connection
                 * checks, the nic is definitively speaking with
                 * his link partner.
                 */
                goto too_good_connection;
        }

        if (tulip_media_cap[dev->if_port] & MediaIsMII) {
                spin_lock_irq(&tp->lock);
                if (tulip_check_duplex(dev) > 0)
                        next_tick = 3*HZ;
                spin_unlock_irq(&tp->lock);
        } else {
                int csr12 = ioread32(ioaddr + CSR12);
                int new_csr6 = tp->csr6 & ~0x40C40200;
                int phy_reg = ioread32(ioaddr + 0xB8);
                int csr5 = ioread32(ioaddr + CSR5);

                if (tulip_debug > 1)
                        netdev_dbg(dev, "PNIC timer PHY status %08x, %s CSR5 %08x\n",
                                   phy_reg, medianame[dev->if_port], csr5);
                if (phy_reg & 0x04000000) {     /* Remote link fault */
                        iowrite32(0x0201F078, ioaddr + 0xB8);
                        next_tick = 1*HZ;
                        tp->nwayset = 0;
                } else if (phy_reg & 0x78000000) { /* Ignore baseT4 */
                        pnic_do_nway(dev);
                        next_tick = 60*HZ;
                } else if (csr5 & TPLnkFail) { /* 100baseTx link beat */
                        if (tulip_debug > 1)
                                netdev_dbg(dev, "%s link beat failed, CSR12 %04x, CSR5 %08x, PHY %03x\n",
                                           medianame[dev->if_port],
                                           csr12,
                                           ioread32(ioaddr + CSR5),
                                           ioread32(ioaddr + 0xB8));
                        next_tick = 3*HZ;
                        if (tp->medialock) {
                        } else if (tp->nwayset  &&  (dev->if_port & 1)) {
                                next_tick = 1*HZ;
                        } else if (dev->if_port == 0) {
                                dev->if_port = 3;
                                iowrite32(0x33, ioaddr + CSR12);
                                new_csr6 = 0x01860000;
                                iowrite32(0x1F868, ioaddr + 0xB8);
                        } else {
                                dev->if_port = 0;
                                iowrite32(0x32, ioaddr + CSR12);
                                new_csr6 = 0x00420000;
                                iowrite32(0x1F078, ioaddr + 0xB8);
                        }
                        if (tp->csr6 != new_csr6) {
                                tp->csr6 = new_csr6;
                                /* Restart Tx */
                                tulip_restart_rxtx(tp);
                                netif_trans_update(dev);
                                if (tulip_debug > 1)
                                        dev_info(&dev->dev,
                                                 "Changing PNIC configuration to %s %s-duplex, CSR6 %08x\n",
                                                 medianame[dev->if_port],
                                                 tp->full_duplex ? "full" : "half",
                                                 new_csr6);
                        }
                }
        }
too_good_connection:
        mod_timer(&tp->timer, RUN_AT(next_tick));
        if(!ioread32(ioaddr + CSR7)) {
                if (tulip_debug > 1)
                        dev_info(&dev->dev, "sw timer wakeup\n");
                disable_irq(dev->irq);
                tulip_refill_rx(dev);
                enable_irq(dev->irq);
                iowrite32(tulip_tbl[tp->chip_id].valid_intrs, ioaddr + CSR7);
        }
}