1 files changed, 208 insertions, 63 deletions

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index e7cf313e359b..36361f8bf894 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -31,6 +31,7 @@
 #include <linux/phy.h>
 #include <linux/platform_device.h>
 #include <net/ip.h>
+#include <net/ncsi.h>
 
 #include "ftgmac100.h"
 
@@ -68,10 +69,14 @@ struct ftgmac100 {
 
 	struct net_device *netdev;
 	struct device *dev;
+	struct ncsi_dev *ndev;
 	struct napi_struct napi;
 
 	struct mii_bus *mii_bus;
 	int old_speed;
+	int int_mask_all;
+	bool use_ncsi;
+	bool enabled;
 };
 
 static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
@@ -80,14 +85,6 @@ static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
 /******************************************************************************
  * internal functions (hardware register access)
  *****************************************************************************/
-#define INT_MASK_ALL_ENABLED	(FTGMAC100_INT_RPKT_LOST	| \
-				 FTGMAC100_INT_XPKT_ETH		| \
-				 FTGMAC100_INT_XPKT_LOST	| \
-				 FTGMAC100_INT_AHB_ERR		| \
-				 FTGMAC100_INT_PHYSTS_CHG	| \
-				 FTGMAC100_INT_RPKT_BUF		| \
-				 FTGMAC100_INT_NO_RXBUF)
-
 static void ftgmac100_set_rx_ring_base(struct ftgmac100 *priv, dma_addr_t addr)
 {
 	iowrite32(addr, priv->base + FTGMAC100_OFFSET_RXR_BADR);
@@ -141,6 +138,55 @@ static void ftgmac100_set_mac(struct ftgmac100 *priv, const unsigned char *mac)
 	iowrite32(laddr, priv->base + FTGMAC100_OFFSET_MAC_LADR);
 }
 
+static void ftgmac100_setup_mac(struct ftgmac100 *priv)
+{
+	u8 mac[ETH_ALEN];
+	unsigned int m;
+	unsigned int l;
+	void *addr;
+
+	addr = device_get_mac_address(priv->dev, mac, ETH_ALEN);
+	if (addr) {
+		ether_addr_copy(priv->netdev->dev_addr, mac);
+		dev_info(priv->dev, "Read MAC address %pM from device tree\n",
+			 mac);
+		return;
+	}
+
+	m = ioread32(priv->base + FTGMAC100_OFFSET_MAC_MADR);
+	l = ioread32(priv->base + FTGMAC100_OFFSET_MAC_LADR);
+
+	mac[0] = (m >> 8) & 0xff;
+	mac[1] = m & 0xff;
+	mac[2] = (l >> 24) & 0xff;
+	mac[3] = (l >> 16) & 0xff;
+	mac[4] = (l >> 8) & 0xff;
+	mac[5] = l & 0xff;
+
+	if (is_valid_ether_addr(mac)) {
+		ether_addr_copy(priv->netdev->dev_addr, mac);
+		dev_info(priv->dev, "Read MAC address %pM from chip\n", mac);
+	} else {
+		eth_hw_addr_random(priv->netdev);
+		dev_info(priv->dev, "Generated random MAC address %pM\n",
+			 priv->netdev->dev_addr);
+	}
+}
+
+static int ftgmac100_set_mac_addr(struct net_device *dev, void *p)
+{
+	int ret;
+
+	ret = eth_prepare_mac_addr_change(dev, p);
+	if (ret < 0)
+		return ret;
+
+	eth_commit_mac_addr_change(dev, p);
+	ftgmac100_set_mac(netdev_priv(dev), dev->dev_addr);
+
+	return 0;
+}
+
 static void ftgmac100_init_hw(struct ftgmac100 *priv)
 {
 	/* setup ring buffer base registers */
@@ -952,7 +998,10 @@ static irqreturn_t ftgmac100_interrupt(int irq, void *dev_id)
 	struct net_device *netdev = dev_id;
 	struct ftgmac100 *priv = netdev_priv(netdev);
 
-	if (likely(netif_running(netdev))) {
+	/* When running in NCSI mode, the interface should be ready for
+	 * receiving or transmitting NCSI packets before it's opened.
+	 */
+	if (likely(priv->use_ncsi || netif_running(netdev))) {
 		/* Disable interrupts for polling */
 		iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
 		napi_schedule(&priv->napi);
@@ -1005,8 +1054,9 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 		ftgmac100_tx_complete(priv);
 	}
 
-	if (status & (FTGMAC100_INT_NO_RXBUF | FTGMAC100_INT_RPKT_LOST |
-		      FTGMAC100_INT_AHB_ERR | FTGMAC100_INT_PHYSTS_CHG)) {
+	if (status & priv->int_mask_all & (FTGMAC100_INT_NO_RXBUF |
+			FTGMAC100_INT_RPKT_LOST | FTGMAC100_INT_AHB_ERR |
+			FTGMAC100_INT_PHYSTS_CHG)) {
 		if (net_ratelimit())
 			netdev_info(netdev, "[ISR] = 0x%x: %s%s%s%s\n", status,
 				    status & FTGMAC100_INT_NO_RXBUF ? "NO_RXBUF " : "",
@@ -1029,7 +1079,8 @@ static int ftgmac100_poll(struct napi_struct *napi, int budget)
 		napi_complete(napi);
 
 		/* enable all interrupts */
-		iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+		iowrite32(priv->int_mask_all,
+			  priv->base + FTGMAC100_OFFSET_IER);
 	}
 
 	return rx;
@@ -1065,17 +1116,33 @@ static int ftgmac100_open(struct net_device *netdev)
 		goto err_hw;
 
 	ftgmac100_init_hw(priv);
-	ftgmac100_start_hw(priv, 10);
-
-	phy_start(netdev->phydev);
+	ftgmac100_start_hw(priv, priv->use_ncsi ? 100 : 10);
+	if (netdev->phydev)
+		phy_start(netdev->phydev);
+	else if (priv->use_ncsi)
+		netif_carrier_on(netdev);
 
 	napi_enable(&priv->napi);
 	netif_start_queue(netdev);
 
 	/* enable all interrupts */
-	iowrite32(INT_MASK_ALL_ENABLED, priv->base + FTGMAC100_OFFSET_IER);
+	iowrite32(priv->int_mask_all, priv->base + FTGMAC100_OFFSET_IER);
+
+	/* Start the NCSI device */
+	if (priv->use_ncsi) {
+		err = ncsi_start_dev(priv->ndev);
+		if (err)
+			goto err_ncsi;
+	}
+
+	priv->enabled = true;
+
 	return 0;
 
+err_ncsi:
+	napi_disable(&priv->napi);
+	netif_stop_queue(netdev);
+	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
 err_hw:
 	free_irq(priv->irq, netdev);
 err_irq:
@@ -1088,12 +1155,17 @@ static int ftgmac100_stop(struct net_device *netdev)
 {
 	struct ftgmac100 *priv = netdev_priv(netdev);
 
+	if (!priv->enabled)
+		return 0;
+
 	/* disable all interrupts */
+	priv->enabled = false;
 	iowrite32(0, priv->base + FTGMAC100_OFFSET_IER);
 
 	netif_stop_queue(netdev);
 	napi_disable(&priv->napi);
-	phy_stop(netdev->phydev);
+	if (netdev->phydev)
+		phy_stop(netdev->phydev);
 
 	ftgmac100_stop_hw(priv);
 	free_irq(priv->irq, netdev);
@@ -1134,6 +1206,9 @@ static int ftgmac100_hard_start_xmit(struct sk_buff *skb,
 /* optional */
 static int ftgmac100_do_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
 {
+	if (!netdev->phydev)
+		return -ENXIO;
+
 	return phy_mii_ioctl(netdev->phydev, ifr, cmd);
 }
 
@@ -1141,11 +1216,74 @@ static const struct net_device_ops ftgmac100_netdev_ops = {
 	.ndo_open		= ftgmac100_open,
 	.ndo_stop		= ftgmac100_stop,
 	.ndo_start_xmit		= ftgmac100_hard_start_xmit,
-	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_set_mac_address	= ftgmac100_set_mac_addr,
 	.ndo_validate_addr	= eth_validate_addr,
 	.ndo_do_ioctl		= ftgmac100_do_ioctl,
 };
 
+static int ftgmac100_setup_mdio(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+	struct platform_device *pdev = to_platform_device(priv->dev);
+	int i, err = 0;
+
+	/* initialize mdio bus */
+	priv->mii_bus = mdiobus_alloc();
+	if (!priv->mii_bus)
+		return -EIO;
+
+	priv->mii_bus->name = "ftgmac100_mdio";
+	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "%s-%d",
+		 pdev->name, pdev->id);
+	priv->mii_bus->priv = priv->netdev;
+	priv->mii_bus->read = ftgmac100_mdiobus_read;
+	priv->mii_bus->write = ftgmac100_mdiobus_write;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++)
+		priv->mii_bus->irq[i] = PHY_POLL;
+
+	err = mdiobus_register(priv->mii_bus);
+	if (err) {
+		dev_err(priv->dev, "Cannot register MDIO bus!\n");
+		goto err_register_mdiobus;
+	}
+
+	err = ftgmac100_mii_probe(priv);
+	if (err) {
+		dev_err(priv->dev, "MII Probe failed!\n");
+		goto err_mii_probe;
+	}
+
+	return 0;
+
+err_mii_probe:
+	mdiobus_unregister(priv->mii_bus);
+err_register_mdiobus:
+	mdiobus_free(priv->mii_bus);
+	return err;
+}
+
+static void ftgmac100_destroy_mdio(struct net_device *netdev)
+{
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
+	if (!netdev->phydev)
+		return;
+
+	phy_disconnect(netdev->phydev);
+	mdiobus_unregister(priv->mii_bus);
+	mdiobus_free(priv->mii_bus);
+}
+
+static void ftgmac100_ncsi_handler(struct ncsi_dev *nd)
+{
+	if (unlikely(nd->state != ncsi_dev_state_functional))
+		return;
+
+	netdev_info(nd->dev, "NCSI interface %s\n",
+		    nd->link_up ? "up" : "down");
+}
+
 /******************************************************************************
  * struct platform_driver functions
  *****************************************************************************/
@@ -1155,7 +1293,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
 	int irq;
 	struct net_device *netdev;
 	struct ftgmac100 *priv;
-	int err;
+	int err = 0;
 
 	if (!pdev)
 		return -ENODEV;
@@ -1179,7 +1317,6 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 	netdev->ethtool_ops = &ftgmac100_ethtool_ops;
 	netdev->netdev_ops = &ftgmac100_netdev_ops;
-	netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
 
 	platform_set_drvdata(pdev, netdev);
 
@@ -1211,31 +1348,45 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 	priv->irq = irq;
 
-	/* initialize mdio bus */
-	priv->mii_bus = mdiobus_alloc();
-	if (!priv->mii_bus) {
-		err = -EIO;
-		goto err_alloc_mdiobus;
-	}
-
-	priv->mii_bus->name = "ftgmac100_mdio";
-	snprintf(priv->mii_bus->id, MII_BUS_ID_SIZE, "ftgmac100_mii");
-
-	priv->mii_bus->priv = netdev;
-	priv->mii_bus->read = ftgmac100_mdiobus_read;
-	priv->mii_bus->write = ftgmac100_mdiobus_write;
+	/* MAC address from chip or random one */
+	ftgmac100_setup_mac(priv);
+
+	priv->int_mask_all = (FTGMAC100_INT_RPKT_LOST |
+			      FTGMAC100_INT_XPKT_ETH |
+			      FTGMAC100_INT_XPKT_LOST |
+			      FTGMAC100_INT_AHB_ERR |
+			      FTGMAC100_INT_PHYSTS_CHG |
+			      FTGMAC100_INT_RPKT_BUF |
+			      FTGMAC100_INT_NO_RXBUF);
+	if (pdev->dev.of_node &&
+	    of_get_property(pdev->dev.of_node, "use-ncsi", NULL)) {
+		if (!IS_ENABLED(CONFIG_NET_NCSI)) {
+			dev_err(&pdev->dev, "NCSI stack not enabled\n");
+			goto err_ncsi_dev;
+		}
 
-	err = mdiobus_register(priv->mii_bus);
-	if (err) {
-		dev_err(&pdev->dev, "Cannot register MDIO bus!\n");
-		goto err_register_mdiobus;
+		dev_info(&pdev->dev, "Using NCSI interface\n");
+		priv->use_ncsi = true;
+		priv->int_mask_all &= ~FTGMAC100_INT_PHYSTS_CHG;
+		priv->ndev = ncsi_register_dev(netdev, ftgmac100_ncsi_handler);
+		if (!priv->ndev)
+			goto err_ncsi_dev;
+	} else {
+		priv->use_ncsi = false;
+		err = ftgmac100_setup_mdio(netdev);
+		if (err)
+			goto err_setup_mdio;
 	}
 
-	err = ftgmac100_mii_probe(priv);
-	if (err) {
-		dev_err(&pdev->dev, "MII Probe failed!\n");
-		goto err_mii_probe;
-	}
+	/* We have to disable on-chip IP checksum functionality
+	 * when NCSI is enabled on the interface. It doesn't work
+	 * in that case.
+	 */
+	netdev->features = NETIF_F_IP_CSUM | NETIF_F_GRO;
+	if (priv->use_ncsi &&
+	    of_get_property(pdev->dev.of_node, "no-hw-checksum", NULL))
+		netdev->features &= ~NETIF_F_IP_CSUM;
+
 
 	/* register network device */
 	err = register_netdev(netdev);
@@ -1246,21 +1397,12 @@ static int ftgmac100_probe(struct platform_device *pdev)
 
 	netdev_info(netdev, "irq %d, mapped at %p\n", priv->irq, priv->base);
 
-	if (!is_valid_ether_addr(netdev->dev_addr)) {
-		eth_hw_addr_random(netdev);
-		netdev_info(netdev, "generated random MAC address %pM\n",
-			    netdev->dev_addr);
-	}
-
 	return 0;
 
+err_ncsi_dev:
 err_register_netdev:
-	phy_disconnect(netdev->phydev);
-err_mii_probe:
-	mdiobus_unregister(priv->mii_bus);
-err_register_mdiobus:
-	mdiobus_free(priv->mii_bus);
-err_alloc_mdiobus:
+	ftgmac100_destroy_mdio(netdev);
+err_setup_mdio:
 	iounmap(priv->base);
 err_ioremap:
 	release_resource(priv->res);
@@ -1280,10 +1422,7 @@ static int __exit ftgmac100_remove(struct platform_device *pdev)
 	priv = netdev_priv(netdev);
 
 	unregister_netdev(netdev);
-
-	phy_disconnect(netdev->phydev);
-	mdiobus_unregister(priv->mii_bus);
-	mdiobus_free(priv->mii_bus);
+	ftgmac100_destroy_mdio(netdev);
 
 	iounmap(priv->base);
 	release_resource(priv->res);
@@ -1293,14 +1432,20 @@ static int __exit ftgmac100_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id ftgmac100_of_match[] = {
+	{ .compatible = "faraday,ftgmac100" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, ftgmac100_of_match);
+
 static struct platform_driver ftgmac100_driver = {
-	.probe		= ftgmac100_probe,
-	.remove		= __exit_p(ftgmac100_remove),
-	.driver		= {
-		.name	= DRV_NAME,
+	.probe	= ftgmac100_probe,
+	.remove	= __exit_p(ftgmac100_remove),
+	.driver	= {
+		.name		= DRV_NAME,
+		.of_match_table	= ftgmac100_of_match,
 	},
 };
-
 module_platform_driver(ftgmac100_driver);
 
 MODULE_AUTHOR("Po-Yu Chuang <ratbert@faraday-tech.com>");