bgmac.c

	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, 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;
	}

	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, bool full_init)
{
	struct bgmac_dma_ring *ring;
	int i;

	/* 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);

	if (full_init) {
		bgmac_dma_init(bgmac);
		if (1) /* FIXME: is there any case we don't want IRQs? */
			bgmac_chip_intrs_on(bgmac);
	} else {
		for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
			ring = &bgmac->rx_ring[i];
			bgmac_dma_rx_enable(bgmac, ring);
		}
	}

	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;

	/* Ack */
	bgmac_write(bgmac, BGMAC_INT_STATUS, int_status);

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

	bgmac->int_status = int_status;

	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);
	struct bgmac_dma_ring *ring;
	int handled = 0;

	if (bgmac->int_status & BGMAC_IS_TX0) {
		ring = &bgmac->tx_ring[0];
		bgmac_dma_tx_free(bgmac, ring);
		bgmac->int_status &= ~BGMAC_IS_TX0;
	}

	if (bgmac->int_status & BGMAC_IS_RX) {
		ring = &bgmac->rx_ring[0];
		handled += bgmac_dma_rx_read(bgmac, ring, weight);
		bgmac->int_status &= ~BGMAC_IS_RX;
	}

	if (bgmac->int_status) {
		bgmac_err(bgmac, "Unknown IRQs: 0x%08X\n", bgmac->int_status);
		bgmac->int_status = 0;
	}

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

	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);
		goto err_out;
	}
	napi_enable(&bgmac->napi);

	phy_start(bgmac->phy_dev);

	netif_carrier_on(net_dev);

err_out:
	return err;
}

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);

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

	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);

	mii_bus->irq = kmalloc_array(PHY_MAX_ADDR, sizeof(int), GFP_KERNEL);
	if (!mii_bus->irq) {
		err = -ENOMEM;
		goto err_free_bus;
	}
	for (i = 0; i < PHY_MAX_ADDR; i++)
		mii_bus->irq[i] = PHY_POLL;

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

	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 connecton 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_irq:
	kfree(mii_bus->irq);
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);
	kfree(mii_bus->irq);
	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 = core->core_unit ? sprom->et1mac : sprom->et0mac;
	int err;

	/* We don't support 2nd, 3rd, ... units, SPROM has to be adjusted */
	if (core->core_unit > 1) {
		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);
	}

	/* 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;
	SET_ETHTOOL_OPS(net_dev, &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;

	bgmac->phyaddr = core->core_unit ? sprom->et1phyaddr :
			 sprom->et0phyaddr;
	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);

	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");

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

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

	netif_carrier_off(net_dev);

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

	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);

	netif_napi_del(&bgmac->napi);
	unregister_netdev(bgmac->net_dev);
	bgmac_mii_unregister(bgmac);
	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");