[net-next,3/8] smsc95xx: add PAL support to use external PHY drivers

Message ID 9255483491fb18b9cdb2ea86ede6fe8e81c71be0.camel@microchip.com
State New
Headers show
Series
  • Untitled series #40517
Related show

Commit Message

Andre.Edich@microchip.com June 29, 2020, 8:01 p.m.
Generally, each PHY has their own configuration and it can be done
through an external PHY driver.  The smsc95xx driver uses only the
hard-coded internal PHY configuration.

This patch adds PAL (PHY Abstraction Layer) support to probe external
PHY drivers for configuring external PHYs.

Signed-off-by: Andre Edich <andre.edich@microchip.com>

---
 drivers/net/usb/smsc95xx.c | 165 +++++++++++++++++++++++++------------
 1 file changed, 112 insertions(+), 53 deletions(-)

 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
 {
 	unsigned long start_time = jiffies;
@@ -972,51 +992,6 @@ static int smsc95xx_start_rx_path(struct usbnet
*dev, int in_pm)
 	return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
 }
 
-static int smsc95xx_phy_initialize(struct usbnet *dev)
-{
-	int bmcr, ret, timeout = 0;
-
-	/* Initialize MII structure */
-	dev->mii.dev = dev->net;
-	dev->mii.mdio_read = smsc95xx_mdio_read;
-	dev->mii.mdio_write = smsc95xx_mdio_write;
-	dev->mii.phy_id_mask = 0x1f;
-	dev->mii.reg_num_mask = 0x1f;
-	dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
-
-	/* reset phy and wait for reset to complete */
-	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR,
BMCR_RESET);
-
-	do {
-		msleep(10);
-		bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
MII_BMCR);
-		timeout++;
-	} while ((bmcr & BMCR_RESET) && (timeout < 100));
-
-	if (timeout >= 100) {
-		netdev_warn(dev->net, "timeout on PHY Reset");
-		return -EIO;
-	}
-
-	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
-		ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
-		ADVERTISE_PAUSE_ASYM);
-
-	/* read to clear */
-	ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
PHY_INT_SRC);
-	if (ret < 0) {
-		netdev_warn(dev->net, "Failed to read PHY_INT_SRC
during init\n");
-		return ret;
-	}
-
-	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
-		PHY_INT_MASK_DEFAULT_);
-	mii_nway_restart(&dev->mii);
-
-	netif_dbg(dev, ifup, dev->net, "phy initialised
successfully\n");
-	return 0;
-}
-
 static int smsc95xx_reset(struct usbnet *dev)
 {
 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev-
> data[0]);

@@ -1198,12 +1173,6 @@ static int smsc95xx_reset(struct usbnet *dev)
 
 	smsc95xx_set_multicast(dev->net);
 
-	ret = smsc95xx_phy_initialize(dev);
-	if (ret < 0) {
-		netdev_warn(dev->net, "Failed to init PHY\n");
-		return ret;
-	}
-
 	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
 	if (ret < 0)
 		return ret;
@@ -1231,6 +1200,43 @@ static int smsc95xx_reset(struct usbnet *dev)
 	return 0;
 }
 
+static void smsc95xx_handle_link_change(struct net_device *net)
+{
+	phy_print_status(net->phydev);
+}
+
+static int smsc95xx_start_phy(struct usbnet *dev)
+{
+	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev-
> data[0]);

+	struct net_device *net = dev->net;
+	int ret;
+
+	ret = smsc95xx_reset(dev);
+	if (ret < 0)
+		return ret;
+
+	/* attach the mac to the phy */
+	ret = phy_connect_direct(net, pdata->phydev,
+				 &smsc95xx_handle_link_change,
+				 PHY_INTERFACE_MODE_MII);
+	if (ret) {
+		netdev_err(net, "can't attach PHY to %s\n", pdata-
> mdiobus->id);

+		return ret;
+	}
+
+	phy_attached_info(net->phydev);
+	phy_start(net->phydev);
+	mii_nway_restart(&dev->mii);
+	return 0;
+}
+
+static int smsc95xx_disconnect_phy(struct usbnet *dev)
+{
+	phy_stop(dev->net->phydev);
+	phy_disconnect(dev->net->phydev);
+	return 0;
+}
+
 static const struct net_device_ops smsc95xx_netdev_ops = {
 	.ndo_open		= usbnet_open,
 	.ndo_stop		= usbnet_stop,
@@ -1290,10 +1296,53 @@ static int smsc95xx_bind(struct usbnet *dev,
struct usb_interface *intf)
 	if (ret)
 		goto free_pdata;
 
+	pdata->mdiobus = mdiobus_alloc();
+	if (!pdata->mdiobus) {
+		ret = -ENOMEM;
+		goto free_pdata;
+	}
+
+	ret = smsc95xx_read_reg(dev, HW_CFG, &val);
+	if (ret < 0)
+		goto free_mdio;
+
+	/* check for internal phy */
+	if (!(val & HW_CFG_PSEL_))
+		pdata->mdiobus->phy_mask = ~(1u <<
SMSC95XX_INTERNAL_PHY_ID);
+
+	pdata->mdiobus->priv = dev;
+	pdata->mdiobus->read = smsc95xx_mdiobus_read;
+	pdata->mdiobus->write = smsc95xx_mdiobus_write;
+	pdata->mdiobus->name = "smsc95xx-mdiobus";
+
+	dev->mii.phy_id_mask = 0x1f;
+	dev->mii.reg_num_mask = 0x1f;
+
+	snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
+		 "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev-
> devnum);

+
+	ret = mdiobus_register(pdata->mdiobus);
+	if (ret) {
+		netdev_err(dev->net, "Could not register MDIO bus\n");
+		goto free_mdio;
+	}
+
+	pdata->phydev = phy_find_first(pdata->mdiobus);
+	if (!pdata->phydev) {
+		netdev_err(dev->net, "no PHY found\n");
+		ret = -ENODEV;
+		goto unregister_mdio;
+	}
+
+	dev->mii.dev = dev->net;
+	dev->mii.mdio_read = smsc95xx_mdio_read;
+	dev->mii.mdio_write = smsc95xx_mdio_write;
+	dev->mii.phy_id = pdata->phydev->mdio.addr;
+
 	/* detect device revision as different features may be
available */
 	ret = smsc95xx_read_reg(dev, ID_REV, &val);
 	if (ret < 0)
-		goto free_pdata;
+		goto unregister_mdio;
 
 	val >>= 16;
 	pdata->chip_id = val;
@@ -1321,6 +1370,12 @@ static int smsc95xx_bind(struct usbnet *dev,
struct usb_interface *intf)
 
 	return 0;
 
+unregister_mdio:
+	mdiobus_unregister(pdata->mdiobus);
+
+free_mdio:
+	mdiobus_free(pdata->mdiobus);
+
 free_pdata:
 	kfree(pdata);
 	return ret;
@@ -1332,6 +1387,8 @@ static void smsc95xx_unbind(struct usbnet *dev,
struct usb_interface *intf)
 
 	if (pdata) {
 		cancel_delayed_work_sync(&pdata->carrier_check);
+		mdiobus_unregister(pdata->mdiobus);
+		mdiobus_free(pdata->mdiobus);
 		netif_dbg(dev, ifdown, dev->net, "free pdata\n");
 		kfree(pdata);
 		pdata = NULL;
@@ -1893,6 +1950,7 @@ static int smsc95xx_resume(struct usb_interface
*intf)
 	if (ret < 0)
 		netdev_warn(dev->net, "usbnet_resume error\n");
 
+	phy_init_hw(pdata->phydev);
 	return ret;
 }
 
@@ -2098,7 +2156,8 @@ static const struct driver_info smsc95xx_info = {
 	.bind		= smsc95xx_bind,
 	.unbind		= smsc95xx_unbind,
 	.link_reset	= smsc95xx_link_reset,
-	.reset		= smsc95xx_reset,
+	.reset		= smsc95xx_start_phy,
+	.stop		= smsc95xx_disconnect_phy,
 	.rx_fixup	= smsc95xx_rx_fixup,
 	.tx_fixup	= smsc95xx_tx_fixup,
 	.status		= smsc95xx_status,

Patch

diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index bb4ccbda031a..fbb80a7aef32 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -18,6 +18,8 @@ 
 #include <linux/usb/usbnet.h>
 #include <linux/slab.h>
 #include <linux/of_net.h>
+#include <linux/mdio.h>
+#include <linux/phy.h>
 #include "smsc95xx.h"
 
 #define SMSC_CHIPNAME			"smsc95xx"
@@ -64,6 +66,8 @@  struct smsc95xx_priv {
 	bool link_ok;
 	struct delayed_work carrier_check;
 	struct usbnet *dev;
+	struct mii_bus *mdiobus;
+	struct phy_device *phydev;
 };
 
 static bool turbo_mode = true;
@@ -284,6 +288,22 @@  static void smsc95xx_mdio_write(struct net_device
*netdev, int phy_id, int idx,
 	__smsc95xx_mdio_write(netdev, phy_id, idx, regval, 0);
 }
 
+static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int
idx)
+{
+	struct usbnet *dev = bus->priv;
+
+	return __smsc95xx_mdio_read(dev->net, phy_id, idx, 0);
+}
+
+static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int
idx,
+				  u16 regval)
+{
+	struct usbnet *dev = bus->priv;
+
+	__smsc95xx_mdio_write(dev->net, phy_id, idx, regval, 0);
+	return 0;
+}
+