[lan78xx] Add driver for Microchip LAN78xx USB Ethernet NICs

Originally-implemented-by: Ravi Hegde <ravi.hegde@microchip.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/drivers/net/lan78xx.c

@@ -0,0 +1,397 @@
+/*
+ * Copyright (C) 2017 Michael Brown <mbrown@fensystems.co.uk>.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ * You can also choose to distribute this program under the terms of
+ * the Unmodified Binary Distribution Licence (as given in the file
+ * COPYING.UBDL), provided that you have satisfied its requirements.
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <ipxe/ethernet.h>
+#include <ipxe/usb.h>
+#include <ipxe/usbnet.h>
+#include "lan78xx.h"
+
+/** @file
+ *
+ * Microchip LAN78xx USB Ethernet driver
+ *
+ */
+
+/******************************************************************************
+ *
+ * MAC address
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Fetch MAC address from EEPROM
+ *
+ * @v smscusb		SMSC USB device
+ * @ret rc		Return status code
+ */
+static int lan78xx_eeprom_fetch_mac ( struct smscusb_device *smscusb ) {
+	uint32_t hw_cfg;
+	uint32_t orig_hw_cfg;
+	int rc;
+
+	/* Read original HW_CFG value */
+	if ( ( rc = smscusb_readl ( smscusb, LAN78XX_HW_CFG, &hw_cfg ) ) != 0 )
+		goto err_read_hw_cfg;
+	orig_hw_cfg = hw_cfg;
+
+	/* Temporarily disable LED0 and LED1 (which share physical
+	 * pins with EEDO and EECLK respectively).
+	 */
+	hw_cfg &= ~( LAN78XX_HW_CFG_LED0_EN | LAN78XX_HW_CFG_LED1_EN );
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_HW_CFG, hw_cfg ) ) != 0 )
+		goto err_write_hw_cfg;
+
+	/* Fetch MAC address from EEPROM */
+	if ( ( rc = smscusb_eeprom_fetch_mac ( smscusb,
+					       LAN78XX_E2P_BASE ) ) != 0 )
+		goto err_fetch_mac;
+
+ err_fetch_mac:
+	smscusb_writel ( smscusb, LAN78XX_HW_CFG, orig_hw_cfg );
+ err_write_hw_cfg:
+ err_read_hw_cfg:
+	return rc;
+}
+
+/**
+ * Fetch MAC address
+ *
+ * @v smscusb		SMSC USB device
+ * @ret rc		Return status code
+ */
+static int lan78xx_fetch_mac ( struct smscusb_device *smscusb ) {
+	struct net_device *netdev = smscusb->netdev;
+	int rc;
+
+	/* Read MAC address from EEPROM, if present */
+	if ( ( rc = lan78xx_eeprom_fetch_mac ( smscusb ) ) == 0 )
+		return 0;
+
+	/* Read MAC address from OTP, if present */
+	if ( ( rc = smscusb_otp_fetch_mac ( smscusb, LAN78XX_OTP_BASE ) ) == 0 )
+		return 0;
+
+	/* Otherwise, generate a random MAC address */
+	eth_random_addr ( netdev->hw_addr );
+	DBGC ( smscusb, "LAN78XX %p using random MAC %s\n",
+	       smscusb, eth_ntoa ( netdev->hw_addr ) );
+	return 0;
+}
+
+/******************************************************************************
+ *
+ * Device reset
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Reset device
+ *
+ * @v smscusb		SMSC USB device
+ * @ret rc		Return status code
+ */
+static int lan78xx_reset ( struct smscusb_device *smscusb ) {
+	uint32_t hw_cfg;
+	unsigned int i;
+	int rc;
+
+	/* Reset device */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_HW_CFG,
+				     LAN78XX_HW_CFG_LRST ) ) != 0 )
+		return rc;
+
+	/* Wait for reset to complete */
+	for ( i = 0 ; i < LAN78XX_RESET_MAX_WAIT_MS ; i++ ) {
+
+		/* Check if reset has completed */
+		if ( ( rc = smscusb_readl ( smscusb, LAN78XX_HW_CFG,
+					    &hw_cfg ) ) != 0 )
+			return rc;
+		if ( ! ( hw_cfg & LAN78XX_HW_CFG_LRST ) )
+			return 0;
+
+		/* Delay */
+		mdelay ( 1 );
+	}
+
+	DBGC ( smscusb, "LAN78XX %p timed out waiting for reset\n",
+	       smscusb );
+	return -ETIMEDOUT;
+}
+
+/******************************************************************************
+ *
+ * Network device interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Open network device
+ *
+ * @v netdev		Network device
+ * @ret rc		Return status code
+ */
+static int lan78xx_open ( struct net_device *netdev ) {
+	struct smscusb_device *smscusb = netdev->priv;
+	uint32_t usb_cfg0;
+	int rc;
+
+	/* Clear stored interrupt status */
+	smscusb->int_sts = 0;
+
+	/* Configure bulk IN empty response */
+	if ( ( rc = smscusb_readl ( smscusb, LAN78XX_USB_CFG0,
+				    &usb_cfg0 ) ) != 0 )
+		goto err_usb_cfg0_read;
+	usb_cfg0 |= LAN78XX_USB_CFG0_BIR;
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_USB_CFG0,
+				     usb_cfg0 ) ) != 0 )
+		goto err_usb_cfg0_write;
+
+	/* Open USB network device */
+	if ( ( rc = usbnet_open ( &smscusb->usbnet ) ) != 0 ) {
+		DBGC ( smscusb, "LAN78XX %p could not open: %s\n",
+		       smscusb, strerror ( rc ) );
+		goto err_open;
+	}
+
+	/* Configure interrupt endpoint */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_INT_EP_CTL,
+				     ( LAN78XX_INT_EP_CTL_RDFO_EN |
+				       LAN78XX_INT_EP_CTL_PHY_EN ) ) ) != 0 )
+		goto err_int_ep_ctl;
+
+	/* Configure bulk IN delay */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_BULK_IN_DLY,
+				     LAN78XX_BULK_IN_DLY_SET ( 0 ) ) ) != 0 )
+		goto err_bulk_in_dly;
+
+	/* Configure receive filters */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_RFE_CTL,
+				     ( LAN78XX_RFE_CTL_AB |
+				       LAN78XX_RFE_CTL_AM |
+				       LAN78XX_RFE_CTL_AU ) ) ) != 0 )
+		goto err_rfe_ctl;
+
+	/* Configure receive FIFO */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_FCT_RX_CTL,
+				     ( LAN78XX_FCT_RX_CTL_EN |
+				       LAN78XX_FCT_RX_CTL_BAD ) ) ) != 0 )
+		goto err_fct_rx_ctl;
+
+	/* Configure transmit FIFO */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_FCT_TX_CTL,
+				     LAN78XX_FCT_TX_CTL_EN ) ) != 0 )
+		goto err_fct_tx_ctl;
+
+	/* Configure receive datapath */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_MAC_RX,
+				     ( LAN78XX_MAC_RX_MAX_SIZE_DEFAULT |
+				       LAN78XX_MAC_RX_FCS |
+				       LAN78XX_MAC_RX_EN ) ) ) != 0 )
+		goto err_mac_rx;
+
+	/* Configure transmit datapath */
+	if ( ( rc = smscusb_writel ( smscusb, LAN78XX_MAC_TX,
+				     LAN78XX_MAC_TX_EN ) ) != 0 )
+		goto err_mac_tx;
+
+	/* Set MAC address */
+	if ( ( rc = smscusb_set_address ( smscusb,
+					  LAN78XX_RX_ADDR_BASE ) ) != 0 )
+		goto err_set_address;
+
+	/* Set MAC address perfect filter */
+	if ( ( rc = smscusb_set_filter ( smscusb,
+					 LAN78XX_ADDR_FILT_BASE ) ) != 0 )
+		goto err_set_filter;
+
+	/* Enable PHY interrupts and update link status */
+	if ( ( rc = smscusb_mii_open ( smscusb, LAN78XX_MII_PHY_INTR_MASK,
+				       ( LAN78XX_PHY_INTR_ENABLE |
+					 LAN78XX_PHY_INTR_LINK |
+					 LAN78XX_PHY_INTR_ANEG_ERR |
+					 LAN78XX_PHY_INTR_ANEG_DONE ) ) ) != 0 )
+		goto err_mii_open;
+
+	return 0;
+
+ err_mii_open:
+ err_set_filter:
+ err_set_address:
+ err_mac_tx:
+ err_mac_rx:
+ err_fct_tx_ctl:
+ err_fct_rx_ctl:
+ err_rfe_ctl:
+ err_bulk_in_dly:
+ err_int_ep_ctl:
+	usbnet_close ( &smscusb->usbnet );
+ err_open:
+ err_usb_cfg0_write:
+ err_usb_cfg0_read:
+	lan78xx_reset ( smscusb );
+	return rc;
+}
+
+/**
+ * Close network device
+ *
+ * @v netdev		Network device
+ */
+static void lan78xx_close ( struct net_device *netdev ) {
+	struct smscusb_device *smscusb = netdev->priv;
+
+	/* Close USB network device */
+	usbnet_close ( &smscusb->usbnet );
+
+	/* Dump statistics (for debugging) */
+	if ( DBG_LOG )
+		smsc75xx_dump_statistics ( smscusb );
+
+	/* Reset device */
+	lan78xx_reset ( smscusb );
+}
+
+/** LAN78xx network device operations */
+static struct net_device_operations lan78xx_operations = {
+	.open		= lan78xx_open,
+	.close		= lan78xx_close,
+	.transmit	= smsc75xx_transmit,
+	.poll		= smsc75xx_poll,
+};
+
+/******************************************************************************
+ *
+ * USB interface
+ *
+ ******************************************************************************
+ */
+
+/**
+ * Probe device
+ *
+ * @v func		USB function
+ * @v config		Configuration descriptor
+ * @ret rc		Return status code
+ */
+static int lan78xx_probe ( struct usb_function *func,
+			   struct usb_configuration_descriptor *config ) {
+	struct net_device *netdev;
+	struct smscusb_device *smscusb;
+	int rc;
+
+	/* Allocate and initialise structure */
+	netdev = alloc_etherdev ( sizeof ( *smscusb ) );
+	if ( ! netdev ) {
+		rc = -ENOMEM;
+		goto err_alloc;
+	}
+	netdev_init ( netdev, &lan78xx_operations );
+	netdev->dev = &func->dev;
+	smscusb = netdev->priv;
+	memset ( smscusb, 0, sizeof ( *smscusb ) );
+	smscusb_init ( smscusb, netdev, func, &smsc75xx_in_operations );
+	smscusb_mii_init ( smscusb, LAN78XX_MII_BASE,
+			   LAN78XX_MII_PHY_INTR_SOURCE );
+	usb_refill_init ( &smscusb->usbnet.in, 0, SMSC75XX_IN_MTU,
+			  SMSC75XX_IN_MAX_FILL );
+	DBGC ( smscusb, "LAN78XX %p on %s\n", smscusb, func->name );
+
+	/* Describe USB network device */
+	if ( ( rc = usbnet_describe ( &smscusb->usbnet, config ) ) != 0 ) {
+		DBGC ( smscusb, "LAN78XX %p could not describe: %s\n",
+		       smscusb, strerror ( rc ) );
+		goto err_describe;
+	}
+
+	/* Reset device */
+	if ( ( rc = lan78xx_reset ( smscusb ) ) != 0 )
+		goto err_reset;
+
+	/* Read MAC address */
+	if ( ( rc = lan78xx_fetch_mac ( smscusb ) ) != 0 )
+		goto err_fetch_mac;
+
+	/* Register network device */
+	if ( ( rc = register_netdev ( netdev ) ) != 0 )
+		goto err_register;
+
+	usb_func_set_drvdata ( func, netdev );
+	return 0;
+
+	unregister_netdev ( netdev );
+ err_register:
+ err_fetch_mac:
+ err_reset:
+ err_describe:
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+ err_alloc:
+	return rc;
+}
+
+/**
+ * Remove device
+ *
+ * @v func		USB function
+ */
+static void lan78xx_remove ( struct usb_function *func ) {
+	struct net_device *netdev = usb_func_get_drvdata ( func );
+
+	unregister_netdev ( netdev );
+	netdev_nullify ( netdev );
+	netdev_put ( netdev );
+}
+
+/** LAN78xx device IDs */
+static struct usb_device_id lan78xx_ids[] = {
+	{
+		.name = "lan7800",
+		.vendor = 0x0424,
+		.product = 0x7800,
+	},
+	{
+		.name = "lan7850",
+		.vendor = 0x0424,
+		.product = 0x7850,
+	},
+};
+
+/** LAN78xx driver */
+struct usb_driver lan78xx_driver __usb_driver = {
+	.ids = lan78xx_ids,
+	.id_count = ( sizeof ( lan78xx_ids ) / sizeof ( lan78xx_ids[0] ) ),
+	.class = USB_CLASS_ID ( 0xff, 0x00, 0xff ),
+	.score = USB_SCORE_NORMAL,
+	.probe = lan78xx_probe,
+	.remove = lan78xx_remove,
+};