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net/faraday: Support NCSI mode

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This makes ftgmac100 driver support NCSI mode. The NCSI is enabled
on the interface if property "use-nc-si" or "use-ncsi" is found from
the device node in device tree.

   * No PHY device is used when NCSI mode is enabled.
   * The NCSI device (struct ncsi_dev) is created when probing the
     device while it's enabled/started when the interface is brought
     up.
   * Hardware IP checksum dosn't work when NCSI mode is enabled. It
     is disabled on enabled NCSI.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Acked-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Gavin Shan 2016-07-19 11:54:23 +10:00 committed by David S. Miller
parent 113ce107af
commit bd466c3fb5
1 changed files with 75 additions and 10 deletions
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85
drivers/net/ethernet/faraday/ftgmac100.c
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@ -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 +69,13 @@ 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;
bool use_ncsi;
bool enabled;
};
static int ftgmac100_alloc_rx_page(struct ftgmac100 *priv,
@ -1010,7 +1014,10 @@ 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);
@ -1123,17 +1130,33 @@ 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);
/* 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:
@ -1146,12 +1169,17 @@ 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);
@ -1192,6 +1220,9 @@ 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);
}
@ -1258,6 +1289,15 @@ static void ftgmac100_destroy_mdio(struct net_device *netdev)
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
*****************************************************************************/
@ -1267,7 +1307,7 @@ 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;
@ -1291,7 +1331,6 @@ 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);
@ -1326,9 +1365,34 @@ static int ftgmac100_probe(struct platform_device *pdev)
/* MAC address from chip or random one */
ftgmac100_setup_mac(priv);
err = ftgmac100_setup_mdio(netdev);
if (err)
goto err_setup_mdio;
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;
}
dev_info(&pdev->dev, "Using NCSI interface\n");
priv->use_ncsi = true;
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;
}
/* 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);
@ -1341,6 +1405,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
return 0;
err_ncsi_dev:
err_register_netdev:
ftgmac100_destroy_mdio(netdev);
err_setup_mdio: