bgmac.c

{
	struct bcma_device *core = bgmac->core;
	u8 imode;

	if (bgmac_is_bcm4707_family(bgmac)) {
		bcma_awrite32(core, BCMA_IOCTL,
			      bcma_aread32(core, BCMA_IOCTL) | 0x40 |
			      BGMAC_BCMA_IOCTL_SW_CLKEN);
		bgmac->mac_speed = SPEED_2500;
		bgmac->mac_duplex = DUPLEX_FULL;
		bgmac_mac_speed(bgmac);
	} else {
		imode = (bgmac_read(bgmac, BGMAC_DEV_STATUS) &
			BGMAC_DS_MM_MASK) >> BGMAC_DS_MM_SHIFT;
		if (imode == 0 || imode == 1) {
			bgmac->mac_speed = SPEED_100;
			bgmac->mac_duplex = DUPLEX_FULL;
			bgmac_mac_speed(bgmac);
		}
	}
}

/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipreset */
static void bgmac_chip_reset(struct bgmac *bgmac)
{
	struct bcma_device *core = bgmac->core;
	struct bcma_bus *bus = core->bus;
	struct bcma_chipinfo *ci = &bus->chipinfo;
	u32 flags;
	u32 iost;
	int i;

	if (bcma_core_is_enabled(core)) {
		if (!bgmac->stats_grabbed) {
			/* bgmac_chip_stats_update(bgmac); */
			bgmac->stats_grabbed = true;
		}

		for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
			bgmac_dma_tx_reset(bgmac, &bgmac->tx_ring[i]);

		bgmac_cmdcfg_maskset(bgmac, ~0, BGMAC_CMDCFG_ML, false);
		udelay(1);

		for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
			bgmac_dma_rx_reset(bgmac, &bgmac->rx_ring[i]);

		/* TODO: Clear software multicast filter list */
	}

	iost = bcma_aread32(core, BCMA_IOST);
	if ((ci->id == BCMA_CHIP_ID_BCM5357 && ci->pkg == BCMA_PKG_ID_BCM47186) ||
	    (ci->id == BCMA_CHIP_ID_BCM4749 && ci->pkg == 10) ||
	    (ci->id == BCMA_CHIP_ID_BCM53572 && ci->pkg == BCMA_PKG_ID_BCM47188))
		iost &= ~BGMAC_BCMA_IOST_ATTACHED;

	/* 3GMAC: for BCM4707 & BCM47094, only do core reset at bgmac_probe() */
	if (ci->id != BCMA_CHIP_ID_BCM4707 &&
	    ci->id != BCMA_CHIP_ID_BCM47094) {
		flags = 0;
		if (iost & BGMAC_BCMA_IOST_ATTACHED) {
			flags = BGMAC_BCMA_IOCTL_SW_CLKEN;
			if (!bgmac->has_robosw)
				flags |= BGMAC_BCMA_IOCTL_SW_RESET;
		}
		bcma_core_enable(core, flags);
	}

	/* Request Misc PLL for corerev > 2 */
	if (core->id.rev > 2 && !bgmac_is_bcm4707_family(bgmac)) {
		bgmac_set(bgmac, BCMA_CLKCTLST,
			  BGMAC_BCMA_CLKCTLST_MISC_PLL_REQ);
		bgmac_wait_value(bgmac->core, BCMA_CLKCTLST,
				 BGMAC_BCMA_CLKCTLST_MISC_PLL_ST,
				 BGMAC_BCMA_CLKCTLST_MISC_PLL_ST,
				 1000);
	}

	if (ci->id == BCMA_CHIP_ID_BCM5357 ||
	    ci->id == BCMA_CHIP_ID_BCM4749 ||
	    ci->id == BCMA_CHIP_ID_BCM53572) {
		struct bcma_drv_cc *cc = &bgmac->core->bus->drv_cc;
		u8 et_swtype = 0;
		u8 sw_type = BGMAC_CHIPCTL_1_SW_TYPE_EPHY |
			     BGMAC_CHIPCTL_1_IF_TYPE_MII;
		char buf[4];

		if (bcm47xx_nvram_getenv("et_swtype", buf, sizeof(buf)) > 0) {
			if (kstrtou8(buf, 0, &et_swtype))
				bgmac_err(bgmac, "Failed to parse et_swtype (%s)\n",
					  buf);
			et_swtype &= 0x0f;
			et_swtype <<= 4;
			sw_type = et_swtype;
		} else if (ci->id == BCMA_CHIP_ID_BCM5357 && ci->pkg == BCMA_PKG_ID_BCM5358) {
			sw_type = BGMAC_CHIPCTL_1_SW_TYPE_EPHYRMII;
		} else if ((ci->id == BCMA_CHIP_ID_BCM5357 && ci->pkg == BCMA_PKG_ID_BCM47186) ||
			   (ci->id == BCMA_CHIP_ID_BCM4749 && ci->pkg == 10) ||
			   (ci->id == BCMA_CHIP_ID_BCM53572 && ci->pkg == BCMA_PKG_ID_BCM47188)) {
			sw_type = BGMAC_CHIPCTL_1_IF_TYPE_RGMII |
				  BGMAC_CHIPCTL_1_SW_TYPE_RGMII;
		}
		bcma_chipco_chipctl_maskset(cc, 1,
					    ~(BGMAC_CHIPCTL_1_IF_TYPE_MASK |
					      BGMAC_CHIPCTL_1_SW_TYPE_MASK),
					    sw_type);
	}

	if (iost & BGMAC_BCMA_IOST_ATTACHED && !bgmac->has_robosw)
		bcma_awrite32(core, BCMA_IOCTL,
			      bcma_aread32(core, BCMA_IOCTL) &
			      ~BGMAC_BCMA_IOCTL_SW_RESET);

	/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/gmac_reset
	 * Specs don't say about using BGMAC_CMDCFG_SR, but in this routine
	 * BGMAC_CMDCFG is read _after_ putting chip in a reset. So it has to
	 * be keps until taking MAC out of the reset.
	 */
	bgmac_cmdcfg_maskset(bgmac,
			     ~(BGMAC_CMDCFG_TE |
			       BGMAC_CMDCFG_RE |
			       BGMAC_CMDCFG_RPI |
			       BGMAC_CMDCFG_TAI |
			       BGMAC_CMDCFG_HD |
			       BGMAC_CMDCFG_ML |
			       BGMAC_CMDCFG_CFE |
			       BGMAC_CMDCFG_RL |
			       BGMAC_CMDCFG_RED |
			       BGMAC_CMDCFG_PE |
			       BGMAC_CMDCFG_TPI |
			       BGMAC_CMDCFG_PAD_EN |
			       BGMAC_CMDCFG_PF),
			     BGMAC_CMDCFG_PROM |
			     BGMAC_CMDCFG_NLC |
			     BGMAC_CMDCFG_CFE |
			     BGMAC_CMDCFG_SR(core->id.rev),
			     false);
	bgmac->mac_speed = SPEED_UNKNOWN;
	bgmac->mac_duplex = DUPLEX_UNKNOWN;

	bgmac_clear_mib(bgmac);
	if (core->id.id == BCMA_CORE_4706_MAC_GBIT)
		bcma_maskset32(bgmac->cmn, BCMA_GMAC_CMN_PHY_CTL, ~0,
			       BCMA_GMAC_CMN_PC_MTE);
	else
		bgmac_set(bgmac, BGMAC_PHY_CNTL, BGMAC_PC_MTE);
	bgmac_miiconfig(bgmac);
	bgmac_phy_init(bgmac);

	netdev_reset_queue(bgmac->net_dev);
}

static void bgmac_chip_intrs_on(struct bgmac *bgmac)
{
	bgmac_write(bgmac, BGMAC_INT_MASK, bgmac->int_mask);
}

static void bgmac_chip_intrs_off(struct bgmac *bgmac)
{
	bgmac_write(bgmac, BGMAC_INT_MASK, 0);
	bgmac_read(bgmac, BGMAC_INT_MASK);
}

/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/gmac_enable */
static void bgmac_enable(struct bgmac *bgmac)
{
	struct bcma_chipinfo *ci = &bgmac->core->bus->chipinfo;
	u32 cmdcfg;
	u32 mode;
	u32 rxq_ctl;
	u32 fl_ctl;
	u16 bp_clk;
	u8 mdp;

	cmdcfg = bgmac_read(bgmac, BGMAC_CMDCFG);
	bgmac_cmdcfg_maskset(bgmac, ~(BGMAC_CMDCFG_TE | BGMAC_CMDCFG_RE),
			     BGMAC_CMDCFG_SR(bgmac->core->id.rev), true);
	udelay(2);
	cmdcfg |= BGMAC_CMDCFG_TE | BGMAC_CMDCFG_RE;
	bgmac_write(bgmac, BGMAC_CMDCFG, cmdcfg);

	mode = (bgmac_read(bgmac, BGMAC_DEV_STATUS) & BGMAC_DS_MM_MASK) >>
		BGMAC_DS_MM_SHIFT;
	if (ci->id != BCMA_CHIP_ID_BCM47162 || mode != 0)
		bgmac_set(bgmac, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT);
	if (ci->id == BCMA_CHIP_ID_BCM47162 && mode == 2)
		bcma_chipco_chipctl_maskset(&bgmac->core->bus->drv_cc, 1, ~0,
					    BGMAC_CHIPCTL_1_RXC_DLL_BYPASS);

	switch (ci->id) {
	case BCMA_CHIP_ID_BCM5357:
	case BCMA_CHIP_ID_BCM4749:
	case BCMA_CHIP_ID_BCM53572:
	case BCMA_CHIP_ID_BCM4716:
	case BCMA_CHIP_ID_BCM47162:
		fl_ctl = 0x03cb04cb;
		if (ci->id == BCMA_CHIP_ID_BCM5357 ||
		    ci->id == BCMA_CHIP_ID_BCM4749 ||
		    ci->id == BCMA_CHIP_ID_BCM53572)
			fl_ctl = 0x2300e1;
		bgmac_write(bgmac, BGMAC_FLOW_CTL_THRESH, fl_ctl);
		bgmac_write(bgmac, BGMAC_PAUSE_CTL, 0x27fff);
		break;
	}

	if (!bgmac_is_bcm4707_family(bgmac)) {
		rxq_ctl = bgmac_read(bgmac, BGMAC_RXQ_CTL);
		rxq_ctl &= ~BGMAC_RXQ_CTL_MDP_MASK;
		bp_clk = bcma_pmu_get_bus_clock(&bgmac->core->bus->drv_cc) /
				1000000;
		mdp = (bp_clk * 128 / 1000) - 3;
		rxq_ctl |= (mdp << BGMAC_RXQ_CTL_MDP_SHIFT);
		bgmac_write(bgmac, BGMAC_RXQ_CTL, rxq_ctl);
	}
}

/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipinit */
static void bgmac_chip_init(struct bgmac *bgmac)
{
	/* 1 interrupt per received frame */
	bgmac_write(bgmac, BGMAC_INT_RECV_LAZY, 1 << BGMAC_IRL_FC_SHIFT);

	/* Enable 802.3x tx flow control (honor received PAUSE frames) */
	bgmac_cmdcfg_maskset(bgmac, ~BGMAC_CMDCFG_RPI, 0, true);

	bgmac_set_rx_mode(bgmac->net_dev);

	bgmac_write_mac_address(bgmac, bgmac->net_dev->dev_addr);

	if (bgmac->loopback)
		bgmac_cmdcfg_maskset(bgmac, ~0, BGMAC_CMDCFG_ML, false);
	else
		bgmac_cmdcfg_maskset(bgmac, ~BGMAC_CMDCFG_ML, 0, false);

	bgmac_write(bgmac, BGMAC_RXMAX_LENGTH, 32 + ETHER_MAX_LEN);

	bgmac_chip_intrs_on(bgmac);

	bgmac_enable(bgmac);
}

static irqreturn_t bgmac_interrupt(int irq, void *dev_id)
{
	struct bgmac *bgmac = netdev_priv(dev_id);

	u32 int_status = bgmac_read(bgmac, BGMAC_INT_STATUS);
	int_status &= bgmac->int_mask;

	if (!int_status)
		return IRQ_NONE;

	int_status &= ~(BGMAC_IS_TX0 | BGMAC_IS_RX);
	if (int_status)
		bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", int_status);

	/* Disable new interrupts until handling existing ones */
	bgmac_chip_intrs_off(bgmac);

	napi_schedule(&bgmac->napi);

	return IRQ_HANDLED;
}

static int bgmac_poll(struct napi_struct *napi, int weight)
{
	struct bgmac *bgmac = container_of(napi, struct bgmac, napi);
	int handled = 0;

	/* Ack */
	bgmac_write(bgmac, BGMAC_INT_STATUS, ~0);

	bgmac_dma_tx_free(bgmac, &bgmac->tx_ring[0]);
	handled += bgmac_dma_rx_read(bgmac, &bgmac->rx_ring[0], weight);

	/* Poll again if more events arrived in the meantime */
	if (bgmac_read(bgmac, BGMAC_INT_STATUS) & (BGMAC_IS_TX0 | BGMAC_IS_RX))
		return weight;

	if (handled < weight) {
		napi_complete(napi);
		bgmac_chip_intrs_on(bgmac);
	}

	return handled;
}

/**************************************************
 * net_device_ops
 **************************************************/

static int bgmac_open(struct net_device *net_dev)
{
	struct bgmac *bgmac = netdev_priv(net_dev);
	int err = 0;

	bgmac_chip_reset(bgmac);

	err = bgmac_dma_init(bgmac);
	if (err)
		return err;

	/* Specs say about reclaiming rings here, but we do that in DMA init */
	bgmac_chip_init(bgmac);

	err = request_irq(bgmac->core->irq, bgmac_interrupt, IRQF_SHARED,
			  KBUILD_MODNAME, net_dev);
	if (err < 0) {
		bgmac_err(bgmac, "IRQ request error: %d!\n", err);
		bgmac_dma_cleanup(bgmac);
		return err;
	}
	napi_enable(&bgmac->napi);

	phy_start(bgmac->phy_dev);

	netif_start_queue(net_dev);

	return 0;
}

static int bgmac_stop(struct net_device *net_dev)
{
	struct bgmac *bgmac = netdev_priv(net_dev);

	netif_carrier_off(net_dev);

	phy_stop(bgmac->phy_dev);

	napi_disable(&bgmac->napi);
	bgmac_chip_intrs_off(bgmac);
	free_irq(bgmac->core->irq, net_dev);

	bgmac_chip_reset(bgmac);
	bgmac_dma_cleanup(bgmac);

	return 0;
}

static netdev_tx_t bgmac_start_xmit(struct sk_buff *skb,
				    struct net_device *net_dev)
{
	struct bgmac *bgmac = netdev_priv(net_dev);
	struct bgmac_dma_ring *ring;

	/* No QOS support yet */
	ring = &bgmac->tx_ring[0];
	return bgmac_dma_tx_add(bgmac, ring, skb);
}

static int bgmac_set_mac_address(struct net_device *net_dev, void *addr)
{
	struct bgmac *bgmac = netdev_priv(net_dev);
	int ret;

	ret = eth_prepare_mac_addr_change(net_dev, addr);
	if (ret < 0)
		return ret;
	bgmac_write_mac_address(bgmac, (u8 *)addr);
	eth_commit_mac_addr_change(net_dev, addr);
	return 0;
}

static int bgmac_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
{
	struct bgmac *bgmac = netdev_priv(net_dev);

	if (!netif_running(net_dev))
		return -EINVAL;

	return phy_mii_ioctl(bgmac->phy_dev, ifr, cmd);
}

static const struct net_device_ops bgmac_netdev_ops = {
	.ndo_open		= bgmac_open,
	.ndo_stop		= bgmac_stop,
	.ndo_start_xmit		= bgmac_start_xmit,
	.ndo_set_rx_mode	= bgmac_set_rx_mode,
	.ndo_set_mac_address	= bgmac_set_mac_address,
	.ndo_validate_addr	= eth_validate_addr,
	.ndo_do_ioctl           = bgmac_ioctl,
};

/**************************************************
 * ethtool_ops
 **************************************************/

static int bgmac_get_settings(struct net_device *net_dev,
			      struct ethtool_cmd *cmd)
{
	struct bgmac *bgmac = netdev_priv(net_dev);

	return phy_ethtool_gset(bgmac->phy_dev, cmd);
}

static int bgmac_set_settings(struct net_device *net_dev,
			      struct ethtool_cmd *cmd)
{
	struct bgmac *bgmac = netdev_priv(net_dev);

	return phy_ethtool_sset(bgmac->phy_dev, cmd);
}

static void bgmac_get_drvinfo(struct net_device *net_dev,
			      struct ethtool_drvinfo *info)
{
	strlcpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
	strlcpy(info->bus_info, "BCMA", sizeof(info->bus_info));
}

static const struct ethtool_ops bgmac_ethtool_ops = {
	.get_settings		= bgmac_get_settings,
	.set_settings		= bgmac_set_settings,
	.get_drvinfo		= bgmac_get_drvinfo,
};

/**************************************************
 * MII
 **************************************************/

static int bgmac_mii_read(struct mii_bus *bus, int mii_id, int regnum)
{
	return bgmac_phy_read(bus->priv, mii_id, regnum);
}

static int bgmac_mii_write(struct mii_bus *bus, int mii_id, int regnum,
			   u16 value)
{
	return bgmac_phy_write(bus->priv, mii_id, regnum, value);
}

static void bgmac_adjust_link(struct net_device *net_dev)
{
	struct bgmac *bgmac = netdev_priv(net_dev);
	struct phy_device *phy_dev = bgmac->phy_dev;
	bool update = false;

	if (phy_dev->link) {
		if (phy_dev->speed != bgmac->mac_speed) {
			bgmac->mac_speed = phy_dev->speed;
			update = true;
		}

		if (phy_dev->duplex != bgmac->mac_duplex) {
			bgmac->mac_duplex = phy_dev->duplex;
			update = true;
		}
	}

	if (update) {
		bgmac_mac_speed(bgmac);
		phy_print_status(phy_dev);
	}
}

static int bgmac_fixed_phy_register(struct bgmac *bgmac)
{
	struct fixed_phy_status fphy_status = {
		.link = 1,
		.speed = SPEED_1000,
		.duplex = DUPLEX_FULL,
	};
	struct phy_device *phy_dev;
	int err;

	phy_dev = fixed_phy_register(PHY_POLL, &fphy_status, -1, NULL);
	if (!phy_dev || IS_ERR(phy_dev)) {
		bgmac_err(bgmac, "Failed to register fixed PHY device\n");
		return -ENODEV;
	}

	err = phy_connect_direct(bgmac->net_dev, phy_dev, bgmac_adjust_link,
				 PHY_INTERFACE_MODE_MII);
	if (err) {
		bgmac_err(bgmac, "Connecting PHY failed\n");
		return err;
	}

	bgmac->phy_dev = phy_dev;

	return err;
}

static int bgmac_mii_register(struct bgmac *bgmac)
{
	struct mii_bus *mii_bus;
	struct phy_device *phy_dev;
	char bus_id[MII_BUS_ID_SIZE + 3];
	int err = 0;

	if (bgmac_is_bcm4707_family(bgmac))
		return bgmac_fixed_phy_register(bgmac);

	mii_bus = mdiobus_alloc();
	if (!mii_bus)
		return -ENOMEM;

	mii_bus->name = "bgmac mii bus";
	sprintf(mii_bus->id, "%s-%d-%d", "bgmac", bgmac->core->bus->num,
		bgmac->core->core_unit);
	mii_bus->priv = bgmac;
	mii_bus->read = bgmac_mii_read;
	mii_bus->write = bgmac_mii_write;
	mii_bus->parent = &bgmac->core->dev;
	mii_bus->phy_mask = ~(1 << bgmac->phyaddr);

	err = mdiobus_register(mii_bus);
	if (err) {
		bgmac_err(bgmac, "Registration of mii bus failed\n");
		goto err_free_bus;
	}

	bgmac->mii_bus = mii_bus;

	/* Connect to the PHY */
	snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, mii_bus->id,
		 bgmac->phyaddr);
	phy_dev = phy_connect(bgmac->net_dev, bus_id, &bgmac_adjust_link,
			      PHY_INTERFACE_MODE_MII);
	if (IS_ERR(phy_dev)) {
		bgmac_err(bgmac, "PHY connection failed\n");
		err = PTR_ERR(phy_dev);
		goto err_unregister_bus;
	}
	bgmac->phy_dev = phy_dev;

	return err;

err_unregister_bus:
	mdiobus_unregister(mii_bus);
err_free_bus:
	mdiobus_free(mii_bus);
	return err;
}

static void bgmac_mii_unregister(struct bgmac *bgmac)
{
	struct mii_bus *mii_bus = bgmac->mii_bus;

	mdiobus_unregister(mii_bus);
	mdiobus_free(mii_bus);
}

/**************************************************
 * BCMA bus ops
 **************************************************/

/* http://bcm-v4.sipsolutions.net/mac-gbit/gmac/chipattach */
static int bgmac_probe(struct bcma_device *core)
{
	struct net_device *net_dev;
	struct bgmac *bgmac;
	struct ssb_sprom *sprom = &core->bus->sprom;
	u8 *mac;
	int err;

	switch (core->core_unit) {
	case 0:
		mac = sprom->et0mac;
		break;
	case 1:
		mac = sprom->et1mac;
		break;
	case 2:
		mac = sprom->et2mac;
		break;
	default:
		pr_err("Unsupported core_unit %d\n", core->core_unit);
		return -ENOTSUPP;
	}

	if (!is_valid_ether_addr(mac)) {
		dev_err(&core->dev, "Invalid MAC addr: %pM\n", mac);
		eth_random_addr(mac);
		dev_warn(&core->dev, "Using random MAC: %pM\n", mac);
	}

	/* This (reset &) enable is not preset in specs or reference driver but
	 * Broadcom does it in arch PCI code when enabling fake PCI device.
	 */
	bcma_core_enable(core, 0);

	/* Allocation and references */
	net_dev = alloc_etherdev(sizeof(*bgmac));
	if (!net_dev)
		return -ENOMEM;
	net_dev->netdev_ops = &bgmac_netdev_ops;
	net_dev->irq = core->irq;
	net_dev->ethtool_ops = &bgmac_ethtool_ops;
	bgmac = netdev_priv(net_dev);
	bgmac->net_dev = net_dev;
	bgmac->core = core;
	bcma_set_drvdata(core, bgmac);

	/* Defaults */
	memcpy(bgmac->net_dev->dev_addr, mac, ETH_ALEN);

	/* On BCM4706 we need common core to access PHY */
	if (core->id.id == BCMA_CORE_4706_MAC_GBIT &&
	    !core->bus->drv_gmac_cmn.core) {
		bgmac_err(bgmac, "GMAC CMN core not found (required for BCM4706)\n");
		err = -ENODEV;
		goto err_netdev_free;
	}
	bgmac->cmn = core->bus->drv_gmac_cmn.core;

	switch (core->core_unit) {
	case 0:
		bgmac->phyaddr = sprom->et0phyaddr;
		break;
	case 1:
		bgmac->phyaddr = sprom->et1phyaddr;
		break;
	case 2:
		bgmac->phyaddr = sprom->et2phyaddr;
		break;
	}
	bgmac->phyaddr &= BGMAC_PHY_MASK;
	if (bgmac->phyaddr == BGMAC_PHY_MASK) {
		bgmac_err(bgmac, "No PHY found\n");
		err = -ENODEV;
		goto err_netdev_free;
	}
	bgmac_info(bgmac, "Found PHY addr: %d%s\n", bgmac->phyaddr,
		   bgmac->phyaddr == BGMAC_PHY_NOREGS ? " (NOREGS)" : "");

	if (core->bus->hosttype == BCMA_HOSTTYPE_PCI) {
		bgmac_err(bgmac, "PCI setup not implemented\n");
		err = -ENOTSUPP;
		goto err_netdev_free;
	}

	bgmac_chip_reset(bgmac);

	/* For Northstar, we have to take all GMAC core out of reset */
	if (bgmac_is_bcm4707_family(bgmac)) {
		struct bcma_device *ns_core;
		int ns_gmac;

		/* Northstar has 4 GMAC cores */
		for (ns_gmac = 0; ns_gmac < 4; ns_gmac++) {
			/* As Northstar requirement, we have to reset all GMACs
			 * before accessing one. bgmac_chip_reset() call
			 * bcma_core_enable() for this core. Then the other
			 * three GMACs didn't reset.  We do it here.
			 */
			ns_core = bcma_find_core_unit(core->bus,
						      BCMA_CORE_MAC_GBIT,
						      ns_gmac);
			if (ns_core && !bcma_core_is_enabled(ns_core))
				bcma_core_enable(ns_core, 0);
		}
	}

	err = bgmac_dma_alloc(bgmac);
	if (err) {
		bgmac_err(bgmac, "Unable to alloc memory for DMA\n");
		goto err_netdev_free;
	}

	bgmac->int_mask = BGMAC_IS_ERRMASK | BGMAC_IS_RX | BGMAC_IS_TX_MASK;
	if (bcm47xx_nvram_getenv("et0_no_txint", NULL, 0) == 0)
		bgmac->int_mask &= ~BGMAC_IS_TX_MASK;

	/* TODO: reset the external phy. Specs are needed */
	bgmac_phy_reset(bgmac);

	bgmac->has_robosw = !!(core->bus->sprom.boardflags_lo &
			       BGMAC_BFL_ENETROBO);
	if (bgmac->has_robosw)
		bgmac_warn(bgmac, "Support for Roboswitch not implemented\n");

	if (core->bus->sprom.boardflags_lo & BGMAC_BFL_ENETADM)
		bgmac_warn(bgmac, "Support for ADMtek ethernet switch not implemented\n");

	netif_napi_add(net_dev, &bgmac->napi, bgmac_poll, BGMAC_WEIGHT);

	err = bgmac_mii_register(bgmac);
	if (err) {
		bgmac_err(bgmac, "Cannot register MDIO\n");
		goto err_dma_free;
	}

	net_dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
	net_dev->hw_features = net_dev->features;
	net_dev->vlan_features = net_dev->features;

	err = register_netdev(bgmac->net_dev);
	if (err) {
		bgmac_err(bgmac, "Cannot register net device\n");
		goto err_mii_unregister;
	}

	netif_carrier_off(net_dev);

	return 0;

err_mii_unregister:
	bgmac_mii_unregister(bgmac);
err_dma_free:
	bgmac_dma_free(bgmac);

err_netdev_free:
	bcma_set_drvdata(core, NULL);
	free_netdev(net_dev);

	return err;
}

static void bgmac_remove(struct bcma_device *core)
{
	struct bgmac *bgmac = bcma_get_drvdata(core);

	unregister_netdev(bgmac->net_dev);
	bgmac_mii_unregister(bgmac);
	netif_napi_del(&bgmac->napi);
	bgmac_dma_free(bgmac);
	bcma_set_drvdata(core, NULL);
	free_netdev(bgmac->net_dev);
}

static struct bcma_driver bgmac_bcma_driver = {
	.name		= KBUILD_MODNAME,
	.id_table	= bgmac_bcma_tbl,
	.probe		= bgmac_probe,
	.remove		= bgmac_remove,
};

static int __init bgmac_init(void)
{
	int err;

	err = bcma_driver_register(&bgmac_bcma_driver);
	if (err)
		return err;
	pr_info("Broadcom 47xx GBit MAC driver loaded\n");

	return 0;
}

static void __exit bgmac_exit(void)
{
	bcma_driver_unregister(&bgmac_bcma_driver);
}

module_init(bgmac_init)
module_exit(bgmac_exit)

MODULE_AUTHOR("Rafał Miłecki");
MODULE_LICENSE("GPL");