Skip to content
Permalink
Browse files

[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>
  • Loading branch information
mcb30 committed Jun 16, 2016
1 parent 1ee7f4e commit 0600d3ae94f93efd10fc6b3c7420a9557a3a1670
Showing with 495 additions and 0 deletions.
  1. +397 −0 src/drivers/net/lan78xx.c
  2. +97 −0 src/drivers/net/lan78xx.h
  3. +1 −0 src/include/ipxe/errfile.h
@@ -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,
};

0 comments on commit 0600d3a

Please sign in to comment.
You can’t perform that action at this time.