bgmac.c

	bgmac->mac_duplex = DUPLEX_UNKNOWN;

	bgmac_clear_mib(bgmac);
	if (bgmac->feature_flags & BGMAC_FEAT_CMN_PHY_CTL)
		bgmac_cmn_maskset32(bgmac, BCMA_GMAC_CMN_PHY_CTL, ~0,
				    BCMA_GMAC_CMN_PC_MTE);
	else
		bgmac_set(bgmac, BGMAC_PHY_CNTL, BGMAC_PC_MTE);
	bgmac_miiconfig(bgmac);
	if (bgmac->mii_bus)
		bgmac->mii_bus->reset(bgmac->mii_bus);

	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)
{
	u32 cmdcfg_sr;
	u32 cmdcfg;
	u32 mode;

	if (bgmac->feature_flags & BGMAC_FEAT_CMDCFG_SR_REV4)
		cmdcfg_sr = BGMAC_CMDCFG_SR_REV4;
	else
		cmdcfg_sr = BGMAC_CMDCFG_SR_REV0;

	cmdcfg = bgmac_read(bgmac, BGMAC_CMDCFG);
	bgmac_cmdcfg_maskset(bgmac, ~(BGMAC_CMDCFG_TE | BGMAC_CMDCFG_RE),
			     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 (bgmac->feature_flags & BGMAC_FEAT_CLKCTLST || mode != 0)
		bgmac_set(bgmac, BCMA_CLKCTLST, BCMA_CLKCTLST_FORCEHT);
	if (bgmac->feature_flags & BGMAC_FEAT_CLKCTLST && mode == 2)
		bgmac_cco_ctl_maskset(bgmac, 1, ~0,
				      BGMAC_CHIPCTL_1_RXC_DLL_BYPASS);

	if (bgmac->feature_flags & (BGMAC_FEAT_FLW_CTRL1 |
				    BGMAC_FEAT_FLW_CTRL2)) {
		u32 fl_ctl;

		if (bgmac->feature_flags & BGMAC_FEAT_FLW_CTRL1)
			fl_ctl = 0x2300e1;
		else
			fl_ctl = 0x03cb04cb;

		bgmac_write(bgmac, BGMAC_FLOW_CTL_THRESH, fl_ctl);
		bgmac_write(bgmac, BGMAC_PAUSE_CTL, 0x27fff);
	}

	if (bgmac->feature_flags & BGMAC_FEAT_SET_RXQ_CLK) {
		u32 rxq_ctl;
		u16 bp_clk;
		u8 mdp;

		rxq_ctl = bgmac_read(bgmac, BGMAC_RXQ_CTL);
		rxq_ctl &= ~BGMAC_RXQ_CTL_MDP_MASK;
		bp_clk = bgmac_get_bus_clock(bgmac) / 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)
		dev_err(bgmac->dev, "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->irq, bgmac_interrupt, IRQF_SHARED,
			  KBUILD_MODNAME, net_dev);
	if (err < 0) {
		dev_err(bgmac->dev, "IRQ request error: %d!\n", err);
		bgmac_dma_cleanup(bgmac);
		return err;
	}
	napi_enable(&bgmac->napi);

	phy_start(net_dev->phydev);

	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(net_dev->phydev);

	napi_disable(&bgmac->napi);
	bgmac_chip_intrs_off(bgmac);
	free_irq(bgmac->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)
{
	if (!netif_running(net_dev))
		return -EINVAL;

	return phy_mii_ioctl(net_dev->phydev, 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
 **************************************************/

struct bgmac_stat {
	u8 size;
	u32 offset;
	const char *name;
};

static struct bgmac_stat bgmac_get_strings_stats[] = {
	{ 8, BGMAC_TX_GOOD_OCTETS, "tx_good_octets" },
	{ 4, BGMAC_TX_GOOD_PKTS, "tx_good" },
	{ 8, BGMAC_TX_OCTETS, "tx_octets" },
	{ 4, BGMAC_TX_PKTS, "tx_pkts" },
	{ 4, BGMAC_TX_BROADCAST_PKTS, "tx_broadcast" },
	{ 4, BGMAC_TX_MULTICAST_PKTS, "tx_multicast" },
	{ 4, BGMAC_TX_LEN_64, "tx_64" },
	{ 4, BGMAC_TX_LEN_65_TO_127, "tx_65_127" },
	{ 4, BGMAC_TX_LEN_128_TO_255, "tx_128_255" },
	{ 4, BGMAC_TX_LEN_256_TO_511, "tx_256_511" },
	{ 4, BGMAC_TX_LEN_512_TO_1023, "tx_512_1023" },
	{ 4, BGMAC_TX_LEN_1024_TO_1522, "tx_1024_1522" },
	{ 4, BGMAC_TX_LEN_1523_TO_2047, "tx_1523_2047" },
	{ 4, BGMAC_TX_LEN_2048_TO_4095, "tx_2048_4095" },
	{ 4, BGMAC_TX_LEN_4096_TO_8191, "tx_4096_8191" },
	{ 4, BGMAC_TX_LEN_8192_TO_MAX, "tx_8192_max" },
	{ 4, BGMAC_TX_JABBER_PKTS, "tx_jabber" },
	{ 4, BGMAC_TX_OVERSIZE_PKTS, "tx_oversize" },
	{ 4, BGMAC_TX_FRAGMENT_PKTS, "tx_fragment" },
	{ 4, BGMAC_TX_UNDERRUNS, "tx_underruns" },
	{ 4, BGMAC_TX_TOTAL_COLS, "tx_total_cols" },
	{ 4, BGMAC_TX_SINGLE_COLS, "tx_single_cols" },
	{ 4, BGMAC_TX_MULTIPLE_COLS, "tx_multiple_cols" },
	{ 4, BGMAC_TX_EXCESSIVE_COLS, "tx_excessive_cols" },
	{ 4, BGMAC_TX_LATE_COLS, "tx_late_cols" },
	{ 4, BGMAC_TX_DEFERED, "tx_defered" },
	{ 4, BGMAC_TX_CARRIER_LOST, "tx_carrier_lost" },
	{ 4, BGMAC_TX_PAUSE_PKTS, "tx_pause" },
	{ 4, BGMAC_TX_UNI_PKTS, "tx_unicast" },
	{ 4, BGMAC_TX_Q0_PKTS, "tx_q0" },
	{ 8, BGMAC_TX_Q0_OCTETS, "tx_q0_octets" },
	{ 4, BGMAC_TX_Q1_PKTS, "tx_q1" },
	{ 8, BGMAC_TX_Q1_OCTETS, "tx_q1_octets" },
	{ 4, BGMAC_TX_Q2_PKTS, "tx_q2" },
	{ 8, BGMAC_TX_Q2_OCTETS, "tx_q2_octets" },
	{ 4, BGMAC_TX_Q3_PKTS, "tx_q3" },
	{ 8, BGMAC_TX_Q3_OCTETS, "tx_q3_octets" },
	{ 8, BGMAC_RX_GOOD_OCTETS, "rx_good_octets" },
	{ 4, BGMAC_RX_GOOD_PKTS, "rx_good" },
	{ 8, BGMAC_RX_OCTETS, "rx_octets" },
	{ 4, BGMAC_RX_PKTS, "rx_pkts" },
	{ 4, BGMAC_RX_BROADCAST_PKTS, "rx_broadcast" },
	{ 4, BGMAC_RX_MULTICAST_PKTS, "rx_multicast" },
	{ 4, BGMAC_RX_LEN_64, "rx_64" },
	{ 4, BGMAC_RX_LEN_65_TO_127, "rx_65_127" },
	{ 4, BGMAC_RX_LEN_128_TO_255, "rx_128_255" },
	{ 4, BGMAC_RX_LEN_256_TO_511, "rx_256_511" },
	{ 4, BGMAC_RX_LEN_512_TO_1023, "rx_512_1023" },
	{ 4, BGMAC_RX_LEN_1024_TO_1522, "rx_1024_1522" },
	{ 4, BGMAC_RX_LEN_1523_TO_2047, "rx_1523_2047" },
	{ 4, BGMAC_RX_LEN_2048_TO_4095, "rx_2048_4095" },
	{ 4, BGMAC_RX_LEN_4096_TO_8191, "rx_4096_8191" },
	{ 4, BGMAC_RX_LEN_8192_TO_MAX, "rx_8192_max" },
	{ 4, BGMAC_RX_JABBER_PKTS, "rx_jabber" },
	{ 4, BGMAC_RX_OVERSIZE_PKTS, "rx_oversize" },
	{ 4, BGMAC_RX_FRAGMENT_PKTS, "rx_fragment" },
	{ 4, BGMAC_RX_MISSED_PKTS, "rx_missed" },
	{ 4, BGMAC_RX_CRC_ALIGN_ERRS, "rx_crc_align" },
	{ 4, BGMAC_RX_UNDERSIZE, "rx_undersize" },
	{ 4, BGMAC_RX_CRC_ERRS, "rx_crc" },
	{ 4, BGMAC_RX_ALIGN_ERRS, "rx_align" },
	{ 4, BGMAC_RX_SYMBOL_ERRS, "rx_symbol" },
	{ 4, BGMAC_RX_PAUSE_PKTS, "rx_pause" },
	{ 4, BGMAC_RX_NONPAUSE_PKTS, "rx_nonpause" },
	{ 4, BGMAC_RX_SACHANGES, "rx_sa_changes" },
	{ 4, BGMAC_RX_UNI_PKTS, "rx_unicast" },
};

#define BGMAC_STATS_LEN	ARRAY_SIZE(bgmac_get_strings_stats)

static int bgmac_get_sset_count(struct net_device *dev, int string_set)
{
	switch (string_set) {
	case ETH_SS_STATS:
		return BGMAC_STATS_LEN;
	}

	return -EOPNOTSUPP;
}

static void bgmac_get_strings(struct net_device *dev, u32 stringset,
			      u8 *data)
{
	int i;

	if (stringset != ETH_SS_STATS)
		return;

	for (i = 0; i < BGMAC_STATS_LEN; i++)
		strlcpy(data + i * ETH_GSTRING_LEN,
			bgmac_get_strings_stats[i].name, ETH_GSTRING_LEN);
}

static void bgmac_get_ethtool_stats(struct net_device *dev,
				    struct ethtool_stats *ss, uint64_t *data)
{
	struct bgmac *bgmac = netdev_priv(dev);
	const struct bgmac_stat *s;
	unsigned int i;
	u64 val;

	if (!netif_running(dev))
		return;

	for (i = 0; i < BGMAC_STATS_LEN; i++) {
		s = &bgmac_get_strings_stats[i];
		val = 0;
		if (s->size == 8)
			val = (u64)bgmac_read(bgmac, s->offset + 4) << 32;
		val |= bgmac_read(bgmac, s->offset);
		data[i] = val;
	}
}

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, "AXI", sizeof(info->bus_info));
}

static const struct ethtool_ops bgmac_ethtool_ops = {
	.get_strings		= bgmac_get_strings,
	.get_sset_count		= bgmac_get_sset_count,
	.get_ethtool_stats	= bgmac_get_ethtool_stats,
	.get_drvinfo		= bgmac_get_drvinfo,
	.get_link_ksettings     = phy_ethtool_get_link_ksettings,
	.set_link_ksettings     = phy_ethtool_set_link_ksettings,
};

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

static void bgmac_adjust_link(struct net_device *net_dev)
{
	struct bgmac *bgmac = netdev_priv(net_dev);
	struct phy_device *phy_dev = net_dev->phydev;
	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_phy_connect_direct(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)) {
		dev_err(bgmac->dev, "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) {
		dev_err(bgmac->dev, "Connecting PHY failed\n");
		return err;
	}

	return err;
}

static int bgmac_phy_connect(struct bgmac *bgmac)
{
	struct phy_device *phy_dev;
	char bus_id[MII_BUS_ID_SIZE + 3];

	/* Connect to the PHY */
	snprintf(bus_id, sizeof(bus_id), PHY_ID_FMT, bgmac->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)) {
		dev_err(bgmac->dev, "PHY connecton failed\n");
		return PTR_ERR(phy_dev);
	}

	return 0;
}

int bgmac_enet_probe(struct bgmac *info)
{
	struct net_device *net_dev;
	struct bgmac *bgmac;
	int err;

	/* Allocation and references */
	net_dev = alloc_etherdev(sizeof(*bgmac));
	if (!net_dev)
		return -ENOMEM;

	net_dev->netdev_ops = &bgmac_netdev_ops;
	net_dev->ethtool_ops = &bgmac_ethtool_ops;
	bgmac = netdev_priv(net_dev);
	memcpy(bgmac, info, sizeof(*bgmac));
	bgmac->net_dev = net_dev;
	net_dev->irq = bgmac->irq;
	SET_NETDEV_DEV(net_dev, bgmac->dev);

	if (!is_valid_ether_addr(bgmac->mac_addr)) {
		dev_err(bgmac->dev, "Invalid MAC addr: %pM\n",
			bgmac->mac_addr);
		eth_random_addr(bgmac->mac_addr);
		dev_warn(bgmac->dev, "Using random MAC: %pM\n",
			 bgmac->mac_addr);
	}
	ether_addr_copy(net_dev->dev_addr, bgmac->mac_addr);

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

	/* This seems to be fixing IRQ by assigning OOB #6 to the core */
	if (bgmac->feature_flags & BGMAC_FEAT_IRQ_ID_OOB_6)
		bgmac_idm_write(bgmac, BCMA_OOB_SEL_OUT_A30, 0x86);

	bgmac_chip_reset(bgmac);

	err = bgmac_dma_alloc(bgmac);
	if (err) {
		dev_err(bgmac->dev, "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;

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

	if (!bgmac->mii_bus)
		err = bgmac_phy_connect_direct(bgmac);
	else
		err = bgmac_phy_connect(bgmac);
	if (err) {
		dev_err(bgmac->dev, "Cannot connect to phy\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) {
		dev_err(bgmac->dev, "Cannot register net device\n");
		goto err_phy_disconnect;
	}

	netif_carrier_off(net_dev);

	return 0;

err_phy_disconnect:
	phy_disconnect(net_dev->phydev);
err_dma_free:
	bgmac_dma_free(bgmac);
err_netdev_free:
	free_netdev(net_dev);

	return err;
}
EXPORT_SYMBOL_GPL(bgmac_enet_probe);

void bgmac_enet_remove(struct bgmac *bgmac)
{
	unregister_netdev(bgmac->net_dev);
	phy_disconnect(bgmac->net_dev->phydev);
	netif_napi_del(&bgmac->napi);
	bgmac_dma_free(bgmac);
	free_netdev(bgmac->net_dev);
}
EXPORT_SYMBOL_GPL(bgmac_enet_remove);

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