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opengnsys_ipxe/src/drivers/net/eepro100.c

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/*
* eepro100.c -- This is a driver for Intel Fast Ethernet Controllers
* (ifec).
*
* Originally written for Etherboot by:
*
* Copyright (C) AW Computer Systems.
* written by R.E.Wolff -- R.E.Wolff@BitWizard.nl
*
* AW Computer Systems is contributing to the free software community
* by paying for this driver and then putting the result under GPL.
*
* If you need a Linux device driver, please contact BitWizard for a
* quote.
*
* 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*
* date version by what
* Written: May 29 1997 V0.10 REW Initial revision.
* changes: May 31 1997 V0.90 REW Works!
* Jun 1 1997 V0.91 REW Cleanup
* Jun 2 1997 V0.92 REW Add some code documentation
* Jul 25 1997 V1.00 REW Tested by AW to work in a PROM
* Cleanup for publication
* Dez 11 2004 V1.10 Kiszka Add RX ring buffer support
* Jun 2008 v2.0 mdeck Updated to iPXE. Changed much.
*
* Cleanups and fixes by Thomas Miletich<thomas.miletich@gmail.com>
*
* This is the etherboot intel etherexpress Pro/100B driver.
*
* It was written from scratch, with Donald Beckers eepro100.c kernel
* driver as a guideline. Mostly the 82557 related definitions and the
* lower level routines have been cut-and-pasted into this source.
*
* The driver was finished before Intel got the NDA out of the closet.
*
* Datasheet is now published and available from
* ftp://download.intel.com/design/network/manuals/8255X_OpenSDM.pdf
* - Michael Brown
* */
FILE_LICENCE ( GPL2_OR_LATER );
/*
* General Theory of Operation
*
* Initialization
*
* ifec_pci_probe() is called by iPXE during initialization. Typical NIC
* initialization is performed. EEPROM data is read.
*
* Network Boot
*
* ifec_net_open() is called by iPXE before attempting to network boot from the
* card. Here, the Command Unit & Receive Unit are initialized. The tx & rx
* rings are setup. The MAC address is programmed and the card is configured.
*
* Transmit
*
* ifec_net_transmit() enqueues a packet in the tx ring - active::tcbs[] The tx
* ring is composed of TCBs linked to each other into a ring. A tx request
* fills out the next available TCB with a pointer to the packet data.
* The last enqueued tx is always at active::tcb_head. Thus, a tx request fills
* out the TCB following tcb_head.
* active::tcb_tail points to the TCB we're awaiting completion of.
* ifec_tx_process() checks tcb_tail, and once complete,
* blindly increments tcb_tail to the next ring TCB.
*
* Receive
*
* priv::rfds[] is an array of Receive Frame Descriptors. The RFDs are linked
* together to form a ring.
* ifec_net_poll() calls ifec_rx_process(), which checks the next RFD for
* data. If we received a packet, we allocate a new io_buffer and copy the
* packet data into it. If alloc_iob() fails, we don't touch the RFD and try
* again on the next poll.
*/
/*
* Debugging levels:
* - DBG() is for any errors, i.e. failed alloc_iob(), malloc_dma(),
* TX overflow, corrupted packets, ...
* - DBG2() is for successful events, like packet received,
* packet transmitted, and other general notifications.
* - DBGP() prints the name of each called function on entry
*/
#include <stdint.h>
#include <byteswap.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <ipxe/ethernet.h>
#include <ipxe/if_ether.h>
#include <ipxe/iobuf.h>
#include <ipxe/malloc.h>
#include <ipxe/pci.h>
#include <ipxe/spi_bit.h>
#include <ipxe/timer.h>
#include <ipxe/nvs.h>
#include <ipxe/threewire.h>
#include <ipxe/netdevice.h>
#include "eepro100.h"
/****************************** Global data **********************************/
/*
* This is the default configuration command data. The values were copied from
* the Linux kernel initialization for the eepro100.
*/
static struct ifec_cfg ifec_cfg = {
.status = 0,
.command = CmdConfigure | CmdSuspend,
.link = 0, /* Filled in later */
.byte = { 22, /* How many bytes in this array */
( TX_FIFO << 4 ) | RX_FIFO, /* Rx & Tx FIFO limits */
0, 0, /* Adaptive Interframe Spacing */
RX_DMA_COUNT, /* Rx DMA max byte count */
TX_DMA_COUNT + 0x80, /* Tx DMA max byte count */
0x32, /* Many bits. */
0x03, /* Discard short receive & Underrun retries */
1, /* 1=Use MII 0=Use AUI */
0,
0x2E, /* NSAI, Preamble length, & Loopback*/
0, /* Linear priority */
0x60, /* L PRI MODE & Interframe spacing */
0, 0xf2,
0x48, /* Promiscuous, Broadcast disable, CRS & CDT */
0, 0x40,
0xf2, /* Stripping, Padding, Receive CRC Transfer */
0x80, /* 0x40=Force full-duplex, 0x80=Allowfull-duplex*/
0x3f, /* Multiple IA */
0x0D } /* Multicast all */
};
static struct net_device_operations ifec_operations = {
.open = ifec_net_open,
.close = ifec_net_close,
.transmit = ifec_net_transmit,
.poll = ifec_net_poll,
.irq = ifec_net_irq
};
/******************* iPXE PCI Device Driver API functions ********************/
/*
* Initialize the PCI device.
*
* @v pci The device's associated pci_device structure.
* @v id The PCI device + vendor id.
* @ret rc Returns zero if successfully initialized.
*
* This function is called very early on, while iPXE is initializing.
* This is a iPXE PCI Device Driver API function.
*/
static int ifec_pci_probe ( struct pci_device *pci )
{
struct net_device *netdev;
struct ifec_private *priv;
int rc;
DBGP ( "ifec_pci_probe: " );
if ( pci->ioaddr == 0 )
return -EINVAL;
netdev = alloc_etherdev ( sizeof(*priv) );
if ( !netdev )
return -ENOMEM;
netdev_init ( netdev, &ifec_operations );
priv = netdev->priv;
pci_set_drvdata ( pci, netdev );
netdev->dev = &pci->dev;
/* enable bus master, etc */
adjust_pci_device( pci );
DBGP ( "pci " );
memset ( priv, 0, sizeof(*priv) );
priv->ioaddr = pci->ioaddr;
ifec_reset ( netdev );
DBGP ( "reset " );
ifec_init_eeprom ( netdev );
/* read MAC address */
nvs_read ( &priv->eeprom.nvs, EEPROM_ADDR_MAC_0, netdev->hw_addr,
ETH_ALEN );
/* read mdio_register */
nvs_read ( &priv->eeprom.nvs, EEPROM_ADDR_MDIO_REGISTER,
&priv->mdio_register, 2 );
if ( ( rc = register_netdev ( netdev ) ) != 0 )
goto error;
netdev_link_up ( netdev );
DBGP ( "ints\n" );
return 0;
error:
ifec_reset ( netdev );
netdev_nullify ( netdev );
netdev_put ( netdev );
return rc;
}
/*
* Remove a device from the PCI device list.
*
* @v pci PCI device to remove.
*
* This is a PCI Device Driver API function.
*/
static void ifec_pci_remove ( struct pci_device *pci )
{
struct net_device *netdev = pci_get_drvdata ( pci );
DBGP ( "ifec_pci_remove\n" );
unregister_netdev ( netdev );
ifec_reset ( netdev );
netdev_nullify ( netdev );
netdev_put ( netdev );
}
/****************** iPXE Network Device Driver API functions *****************/
/*
* Close a network device.
*
* @v netdev Device to close.
*
* This is a iPXE Network Device Driver API function.
*/
static void ifec_net_close ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
unsigned short intr_status;
DBGP ( "ifec_net_close\n" );
/* disable interrupts */
ifec_net_irq ( netdev, 0 );
/* Ack & clear ints */
intr_status = inw ( ioaddr + SCBStatus );
outw ( intr_status, ioaddr + SCBStatus );
inw ( ioaddr + SCBStatus );
ifec_reset ( netdev );
/* Free any resources */
ifec_free ( netdev );
}
/* Interrupts to be masked */
#define INTERRUPT_MASK ( SCBMaskEarlyRx | SCBMaskFlowCtl )
/*
* Enable or disable IRQ masking.
*
* @v netdev Device to control.
* @v enable Zero to mask off IRQ, non-zero to enable IRQ.
*
* This is a iPXE Network Driver API function.
*/
static void ifec_net_irq ( struct net_device *netdev, int enable )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
DBGP ( "ifec_net_irq\n" );
outw ( enable ? INTERRUPT_MASK : SCBMaskAll, ioaddr + SCBCmd );
}
/*
* Opens a network device.
*
* @v netdev Device to be opened.
* @ret rc Non-zero if failed to open.
*
* This enables tx and rx on the device.
* This is a iPXE Network Device Driver API function.
*/
static int ifec_net_open ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
struct ifec_ias *ias = NULL;
struct ifec_cfg *cfg = NULL;
int i, options;
int rc = -ENOMEM;
DBGP ( "ifec_net_open: " );
/* Ensure interrupts are disabled. */
ifec_net_irq ( netdev, 0 );
/* Initialize Command Unit and Receive Unit base addresses. */
ifec_scb_cmd ( netdev, 0, RUAddrLoad );
ifec_scb_cmd ( netdev, virt_to_bus ( &priv->stats ), CUStatsAddr );
ifec_scb_cmd ( netdev, 0, CUCmdBase );
/* Initialize both rings */
if ( ( rc = ifec_rx_setup ( netdev ) ) != 0 )
goto error;
if ( ( rc = ifec_tx_setup ( netdev ) ) != 0 )
goto error;
/* Initialize MDIO */
options = 0x00; /* 0x40 = 10mbps half duplex, 0x00 = Autosense */
ifec_mdio_setup ( netdev, options );
/* Prepare MAC address w/ Individual Address Setup (ias) command.*/
ias = malloc_dma ( sizeof ( *ias ), CB_ALIGN );
if ( !ias ) {
rc = -ENOMEM;
goto error;
}
ias->command = CmdIASetup;
ias->status = 0;
memcpy ( ias->ia, netdev->ll_addr, ETH_ALEN );
/* Prepare operating parameters w/ a configure command. */
cfg = malloc_dma ( sizeof ( *cfg ), CB_ALIGN );
if ( !cfg ) {
rc = -ENOMEM;
goto error;
}
memcpy ( cfg, &ifec_cfg, sizeof ( *cfg ) );
cfg->link = virt_to_bus ( priv->tcbs );
cfg->byte[19] = ( options & 0x10 ) ? 0xC0 : 0x80;
ias->link = virt_to_bus ( cfg );
/* Issue the ias and configure commands. */
ifec_scb_cmd ( netdev, virt_to_bus ( ias ), CUStart );
ifec_scb_cmd_wait ( netdev );
priv->configured = 1;
/* Wait up to 10 ms for configuration to initiate */
for ( i = 10; i && !cfg->status; i-- )
mdelay ( 1 );
if ( ! cfg->status ) {
DBG ( "Failed to initiate!\n" );
goto error;
}
free_dma ( ias, sizeof ( *ias ) );
free_dma ( cfg, sizeof ( *cfg ) );
DBG2 ( "cfg " );
/* Enable rx by sending ring address to card */
if ( priv->rfds[0] != NULL ) {
ifec_scb_cmd ( netdev, virt_to_bus( priv->rfds[0] ), RUStart );
ifec_scb_cmd_wait ( netdev );
}
DBG2 ( "rx_start\n" );
return 0;
error:
free_dma ( cfg, sizeof ( *cfg ) );
free_dma ( ias, sizeof ( *ias ) );
ifec_free ( netdev );
ifec_reset ( netdev );
return rc;
}
/*
* This function allows a driver to process events during operation.
*
* @v netdev Device being polled.
*
* This is called periodically by iPXE to let the driver check the status of
* transmitted packets and to allow the driver to check for received packets.
* This is a iPXE Network Device Driver API function.
*/
static void ifec_net_poll ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
unsigned short intr_status;
DBGP ( "ifec_net_poll\n" );
/* acknowledge interrupts ASAP */
intr_status = inw ( priv->ioaddr + SCBStatus );
outw ( intr_status, priv->ioaddr + SCBStatus );
inw ( priv->ioaddr + SCBStatus );
DBG2 ( "poll - status: 0x%04X\n", intr_status );
/* anything to do here? */
if ( ( intr_status & ( ~INTERRUPT_MASK ) ) == 0 )
return;
/* process received and transmitted packets */
ifec_tx_process ( netdev );
ifec_rx_process ( netdev );
ifec_check_ru_status ( netdev, intr_status );
return;
}
/*
* This transmits a packet.
*
* @v netdev Device to transmit from.
* @v iobuf Data to transmit.
* @ret rc Non-zero if failed to transmit.
*
* This is a iPXE Network Driver API function.
*/
static int ifec_net_transmit ( struct net_device *netdev,
struct io_buffer *iobuf )
{
struct ifec_private *priv = netdev->priv;
struct ifec_tcb *tcb = priv->tcb_head->next;
unsigned long ioaddr = priv->ioaddr;
DBGP ( "ifec_net_transmit\n" );
/* Wait for TCB to become available. */
if ( tcb->status || tcb->iob ) {
DBG ( "TX overflow\n" );
return -ENOBUFS;
}
DBG2 ( "transmitting packet (%zd bytes). status = %hX, cmd=%hX\n",
iob_len ( iobuf ), tcb->status, inw ( ioaddr + SCBCmd ) );
tcb->command = CmdSuspend | CmdTx | CmdTxFlex;
tcb->count = 0x01208000;
tcb->tbd_addr0 = virt_to_bus ( iobuf->data );
tcb->tbd_size0 = 0x3FFF & iob_len ( iobuf );
tcb->iob = iobuf;
ifec_tx_wake ( netdev );
/* Append to end of ring. */
priv->tcb_head = tcb;
return 0;
}
/*************************** Local support functions *************************/
/* Define what each GPIO Pin does */
static const uint16_t ifec_ee_bits[] = {
[SPI_BIT_SCLK] = EE_SHIFT_CLK,
[SPI_BIT_MOSI] = EE_DATA_WRITE,
[SPI_BIT_MISO] = EE_DATA_READ,
[SPI_BIT_SS(0)] = EE_ENB,
};
/*
* Read a single bit from the GPIO pins used for SPI.
* should be called by SPI bitbash functions only
*
* @v basher Bitbash device
* @v bit_id Line to be read
*/
static int ifec_spi_read_bit ( struct bit_basher *basher,
unsigned int bit_id )
{
struct ifec_private *priv =
container_of ( basher, struct ifec_private, spi.basher );
unsigned long ee_addr = priv->ioaddr + CSREeprom;
unsigned int ret = 0;
uint16_t mask;
DBGP ( "ifec_spi_read_bit\n" );
mask = ifec_ee_bits[bit_id];
ret = inw (ee_addr);
return ( ret & mask ) ? 1 : 0;
}
/*
* Write a single bit to the GPIO pins used for SPI.
* should be called by SPI bitbash functions only
*
* @v basher Bitbash device
* @v bit_id Line to write to
* @v data Value to write
*/
static void ifec_spi_write_bit ( struct bit_basher *basher,
unsigned int bit_id,
unsigned long data )
{
struct ifec_private *priv =
container_of ( basher, struct ifec_private, spi.basher );
unsigned long ee_addr = priv->ioaddr + CSREeprom;
short val;
uint16_t mask = ifec_ee_bits[bit_id];
DBGP ( "ifec_spi_write_bit\n" );
val = inw ( ee_addr );
val &= ~mask;
val |= data & mask;
outw ( val, ee_addr );
}
/* set function pointer to SPI read- and write-bit functions */
static struct bit_basher_operations ifec_basher_ops = {
.read = ifec_spi_read_bit,
.write = ifec_spi_write_bit,
};
/*
* Initialize the eeprom stuff
*
* @v netdev Network device
*/
static void ifec_init_eeprom ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
DBGP ( "ifec_init_eeprom\n" );
priv->spi.basher.op = &ifec_basher_ops;
priv->spi.bus.mode = SPI_MODE_THREEWIRE;
init_spi_bit_basher ( &priv->spi );
priv->eeprom.bus = &priv->spi.bus;
/* init as 93c46(93c14 compatible) first, to set the command len,
* block size and word len. Needs to be set for address len detection.
*/
init_at93c46 ( &priv->eeprom, 16 );
/* detect address length, */
threewire_detect_address_len ( &priv->eeprom );
/* address len == 8 means 93c66 instead of 93c46 */
if ( priv->eeprom.address_len == 8 )
init_at93c66 ( &priv->eeprom, 16 );
}
/*
* Support function: ifec_mdio_read
*
* This probably reads a register in the "physical media interface chip".
* -- REW
*/
static int ifec_mdio_read ( struct net_device *netdev, int phy_id,
int location )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
int val;
int boguscnt = 64*4; /* <64 usec. to complete, typ 27 ticks */
DBGP ( "ifec_mdio_read\n" );
outl ( 0x08000000 | ( location << 16 ) | ( phy_id << 21 ),
ioaddr + CSRCtrlMDI );
do {
udelay ( 16 );
val = inl ( ioaddr + CSRCtrlMDI );
if ( --boguscnt < 0 ) {
DBG ( " ifec_mdio_read() time out with val = %X.\n",
val );
break;
}
} while (! ( val & 0x10000000 ) );
return val & 0xffff;
}
/*
* Initializes MDIO.
*
* @v netdev Network device
* @v options MDIO options
*/
static void ifec_mdio_setup ( struct net_device *netdev, int options )
{
struct ifec_private *priv = netdev->priv;
unsigned short mdio_register = priv->mdio_register;
DBGP ( "ifec_mdio_setup\n" );
if ( ( (mdio_register>>8) & 0x3f ) == DP83840
|| ( (mdio_register>>8) & 0x3f ) == DP83840A ) {
int mdi_reg23 = ifec_mdio_read ( netdev, mdio_register
& 0x1f, 23 ) | 0x0422;
if (CONGENB)
mdi_reg23 |= 0x0100;
DBG2 ( "DP83840 specific setup, setting register 23 to "
"%hX.\n", mdi_reg23 );
ifec_mdio_write ( netdev, mdio_register & 0x1f, 23, mdi_reg23 );
}
DBG2 ( "dp83840 " );
if ( options != 0 ) {
ifec_mdio_write ( netdev, mdio_register & 0x1f, 0,
( (options & 0x20) ? 0x2000 : 0 ) |
( (options & 0x10) ? 0x0100 : 0 ) );
DBG2 ( "set mdio_register. " );
}
}
/*
* Support function: ifec_mdio_write
*
* This probably writes to the "physical media interface chip".
* -- REW
*/
static int ifec_mdio_write ( struct net_device *netdev,
int phy_id, int location, int value )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
int val;
int boguscnt = 64*4; /* <64 usec. to complete, typ 27 ticks */
DBGP ( "ifec_mdio_write\n" );
outl ( 0x04000000 | ( location << 16 ) | ( phy_id << 21 ) | value,
ioaddr + CSRCtrlMDI );
do {
udelay ( 16 );
val = inl ( ioaddr + CSRCtrlMDI );
if ( --boguscnt < 0 ) {
DBG ( " ifec_mdio_write() time out with val = %X.\n",
val );
break;
}
} while (! ( val & 0x10000000 ) );
return val & 0xffff;
}
/*
* Resets the hardware.
*
* @v netdev Network device
*/
static void ifec_reset ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
DBGP ( "ifec_reset\n" );
/* do partial reset first */
outl ( PortPartialReset, ioaddr + CSRPort );
inw ( ioaddr + SCBStatus );
udelay ( 20 );
/* full reset */
outl ( PortReset, ioaddr + CSRPort );
inw ( ioaddr + SCBStatus );
udelay ( 20 );
/* disable interrupts again */
ifec_net_irq ( netdev, 0 );
}
/*
* free()s the tx/rx rings.
*
* @v netdev Network device
*/
static void ifec_free ( struct net_device *netdev )
{
struct ifec_private *priv = netdev_priv ( netdev );
int i;
DBGP ( "ifec_free\n" );
/* free all allocated receive io_buffers */
for ( i = 0; i < RFD_COUNT; i++ ) {
free_iob ( priv->rx_iobs[i] );
priv->rx_iobs[i] = NULL;
priv->rfds[i] = NULL;
}
/* free TX ring buffer */
free_dma ( priv->tcbs, TX_RING_BYTES );
priv->tcbs = NULL;
}
/*
* Initializes an RFD.
*
* @v rfd RFD struct to initialize
* @v command Command word
* @v link Link value
*/
static void ifec_rfd_init ( struct ifec_rfd *rfd, s16 command, u32 link )
{
DBGP ( "ifec_rfd_init\n" );
rfd->status = 0;
rfd->command = command;
rfd->rx_buf_addr = 0xFFFFFFFF;
rfd->count = 0;
rfd->size = RFD_PACKET_LEN;
rfd->link = link;
}
/*
* Send address of new RFD to card
*
* @v netdev Network device
*/
static void ifec_reprime_ru ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
int cur_rx = priv->cur_rx;
DBGP ( "ifec_reprime_ru\n" );
if ( priv->rfds[cur_rx] != NULL ) {
ifec_scb_cmd ( netdev, virt_to_bus ( priv->rfds[cur_rx] ),
RUStart );
ifec_scb_cmd_wait ( netdev );
}
}
/*
* Check if reprime of RU needed
*
* @v netdev Network device
*/
static void ifec_check_ru_status ( struct net_device *netdev,
unsigned short intr_status )
{
struct ifec_private *priv = netdev->priv;
DBGP ( "ifec_check_ru_status\n" );
/*
* The chip may have suspended reception for various reasons.
* Check for that, and re-prime it should this be the case.
*/
switch ( ( intr_status >> 2 ) & 0xf ) {
case 0: /* Idle */
case 4: /* Ready */
break;
case 1: /* Suspended */
case 2: /* No resources (RFDs) */
case 9: /* Suspended with no more RBDs */
case 10: /* No resources due to no RBDs */
case 12: /* Ready with no RBDs */
DBG ( "ifec_net_poll: RU reprimed.\n" );
ifec_reprime_ru ( netdev );
break;
default:
/* reserved values */
DBG ( "ifec_net_poll: RU state anomaly: %i\n",
( inw ( priv->ioaddr + SCBStatus ) >> 2 ) & 0xf );
break;
}
}
#define RFD_STATUS ( RFD_OK | RFDRxCol | RFDRxErr | RFDShort | \
RFDDMAOverrun | RFDNoBufs | RFDCRCError )
/*
* Looks for received packets in the rx ring, reports success or error to
* the core accordingly. Starts reallocation of rx ring.
*
* @v netdev Network device
*/
static void ifec_rx_process ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
int cur_rx = priv->cur_rx;
struct io_buffer *iob = priv->rx_iobs[cur_rx];
struct ifec_rfd *rfd = priv->rfds[cur_rx];
unsigned int rx_len;
s16 status;
DBGP ( "ifec_rx_process\n" );
/* Process any received packets */
while ( iob && rfd && ( status = rfd->status ) ) {
rx_len = rfd->count & RFDMaskCount;
DBG2 ( "Got a packet: Len = %d, cur_rx = %d.\n", rx_len,
cur_rx );
DBGIO_HD ( (void*)rfd->packet, 0x30 );
if ( ( status & ( RFD_STATUS & ~RFDShort ) ) != RFD_OK ) {
DBG ( "Corrupted packet received. "
"Status = %#08hx\n", status );
netdev_rx_err ( netdev, iob, -EINVAL );
} else {
/* Hand off the packet to the network subsystem */
iob_put ( iob, rx_len );
DBG2 ( "Received packet: %p, len: %d\n", iob, rx_len );
netdev_rx ( netdev, iob );
}
/* make sure we don't reuse this RFD */
priv->rx_iobs[cur_rx] = NULL;
priv->rfds[cur_rx] = NULL;
/* Next RFD */
priv->cur_rx = ( cur_rx + 1 ) % RFD_COUNT;
cur_rx = priv->cur_rx;
iob = priv->rx_iobs[cur_rx];
rfd = priv->rfds[cur_rx];
}
ifec_refill_rx_ring ( netdev );
}
/*
* Allocates io_buffer, set pointers in ifec_private structure accordingly,
* reserves space for RFD header in io_buffer.
*
* @v netdev Network device
* @v cur Descriptor number to work on
* @v cmd Value to set cmd field in RFD to
* @v link Pointer to ned RFD
* @ret rc 0 on success, negative on failure
*/
static int ifec_get_rx_desc ( struct net_device *netdev, int cur, int cmd,
int link )
{
struct ifec_private *priv = netdev->priv;
struct ifec_rfd *rfd = priv->rfds[cur];
DBGP ( "ifec_get_rx_desc\n" );
priv->rx_iobs[cur] = alloc_iob ( sizeof ( *rfd ) );
if ( ! priv->rx_iobs[cur] ) {
DBG ( "alloc_iob failed. desc. nr: %d\n", cur );
priv->rfds[cur] = NULL;
return -ENOMEM;
}
/* Initialize new tail. */
priv->rfds[cur] = priv->rx_iobs[cur]->data;
ifec_rfd_init ( priv->rfds[cur], cmd, link );
iob_reserve ( priv->rx_iobs[cur], RFD_HEADER_LEN );
return 0;
}
/*
* Allocate new descriptor entries and initialize them if needed
*
* @v netdev Network device
*/
static void ifec_refill_rx_ring ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
int i, cur_rx;
unsigned short intr_status;
DBGP ( "ifec_refill_rx_ring\n" );
for ( i = 0; i < RFD_COUNT; i++ ) {
cur_rx = ( priv->cur_rx + i ) % RFD_COUNT;
/* only refill if empty */
if ( priv->rfds[cur_rx] != NULL ||
priv->rx_iobs[cur_rx] != NULL )
continue;
DBG2 ( "refilling RFD %d\n", cur_rx );
if ( ifec_get_rx_desc ( netdev, cur_rx,
CmdSuspend | CmdEndOfList, 0 ) == 0 ) {
if ( i > 0 ) {
int prev_rx = ( ( ( cur_rx + RFD_COUNT ) - 1 )
% RFD_COUNT );
struct ifec_rfd *rfd = priv->rfds[prev_rx];
rfd->command = 0;
rfd->link = virt_to_bus ( priv->rfds[cur_rx] );
}
}
}
intr_status = inw ( priv->ioaddr + SCBStatus );
ifec_check_ru_status ( netdev, intr_status );
}
/*
* Initial allocation & initialization of the rx ring.
*
* @v netdev Device of rx ring.
* @ret rc Non-zero if error occured
*/
static int ifec_rx_setup ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
int i;
DBGP ( "ifec_rx_setup\n" );
priv->cur_rx = 0;
/* init values for ifec_refill_rx_ring() */
for ( i = 0; i < RFD_COUNT; i++ ) {
priv->rfds[i] = NULL;
priv->rx_iobs[i] = NULL;
}
ifec_refill_rx_ring ( netdev );
return 0;
}
/*
* Initiates a SCB command.
*
* @v netdev Network device
* @v ptr General pointer value for command.
* @v cmd Command to issue.
* @ret rc Non-zero if command not issued.
*/
static int ifec_scb_cmd ( struct net_device *netdev, u32 ptr, u8 cmd )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
int rc;
DBGP ( "ifec_scb_cmd\n" );
rc = ifec_scb_cmd_wait ( netdev ); /* Wait until ready */
if ( !rc ) {
outl ( ptr, ioaddr + SCBPointer );
outb ( cmd, ioaddr + SCBCmd ); /* Issue command */
}
return rc;
}
/*
* Wait for command unit to accept a command.
*
* @v cmd_ioaddr I/O address of command register.
* @ret rc Non-zero if command timed out.
*/
static int ifec_scb_cmd_wait ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
unsigned long cmd_ioaddr = priv->ioaddr + SCBCmd;
int rc, wait = CU_CMD_TIMEOUT;
DBGP ( "ifec_scb_cmd_wait\n" );
for ( ; wait && ( rc = inb ( cmd_ioaddr ) ); wait-- )
udelay ( 1 );
if ( !wait )
DBG ( "ifec_scb_cmd_wait timeout!\n" );
return rc;
}
/*
* Check status of transmitted packets & perform tx completions.
*
* @v netdev Network device.
*/
static void ifec_tx_process ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
struct ifec_tcb *tcb = priv->tcb_tail;
s16 status;
DBGP ( "ifec_tx_process\n" );
/* Check status of transmitted packets */
while ( ( status = tcb->status ) && tcb->iob ) {
if ( status & TCB_U ) {
/* report error to iPXE */
DBG ( "ifec_tx_process : tx error!\n " );
netdev_tx_complete_err ( netdev, tcb->iob, -EINVAL );
} else {
/* report successful transmit */
netdev_tx_complete ( netdev, tcb->iob );
}
DBG2 ( "tx completion\n" );
tcb->iob = NULL;
tcb->status = 0;
priv->tcb_tail = tcb->next; /* Next TCB */
tcb = tcb->next;
}
}
/*
* Allocates & initialize tx resources.
*
* @v netdev Network device.
* @ret rc Non-zero if error occurred.
*/
static int ifec_tx_setup ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
struct ifec_tcb *tcb;
int i;
DBGP ( "ifec_tx_setup\n" );
/* allocate tx ring */
priv->tcbs = malloc_dma ( TX_RING_BYTES, CB_ALIGN );
if ( !priv->tcbs ) {
DBG ( "TX-ring allocation failed\n" );
return -ENOMEM;
}
tcb = priv->tcb_tail = priv->tcbs;
priv->tx_curr = priv->tx_tail = 0;
priv->tx_cnt = 0;
for ( i = 0; i < TCB_COUNT; i++, tcb++ ) {
tcb->status = 0;
tcb->count = 0x01208000;
tcb->iob = NULL;
tcb->tbda_addr = virt_to_bus ( &tcb->tbd_addr0 );
tcb->link = virt_to_bus ( tcb + 1 );
tcb->next = tcb + 1;
}
/* We point tcb_head at the last TCB, so the first ifec_net_transmit()
* will use the first (head->next) TCB to transmit. */
priv->tcb_head = --tcb;
tcb->link = virt_to_bus ( priv->tcbs );
tcb->next = priv->tcbs;
return 0;
}
/*
* Wake up the Command Unit and issue a Resume/Start.
*
* @v netdev Network device containing Command Unit
*
* The time between clearing the S bit and issuing Resume must be as short as
* possible to prevent a race condition. As noted in linux eepro100.c :
* Note: Watch out for the potential race condition here: imagine
* erasing the previous suspend
* the chip processes the previous command
* the chip processes the final command, and suspends
* doing the CU_RESUME
* the chip processes the next-yet-valid post-final-command.
* So blindly sending a CU_RESUME is only safe if we do it immediately after
* erasing the previous CmdSuspend, without the possibility of an intervening
* delay.
*/
void ifec_tx_wake ( struct net_device *netdev )
{
struct ifec_private *priv = netdev->priv;
unsigned long ioaddr = priv->ioaddr;
struct ifec_tcb *tcb = priv->tcb_head->next;
DBGP ( "ifec_tx_wake\n" );
/* For the special case of the first transmit, we issue a START. The
* card won't RESUME after the configure command. */
if ( priv->configured ) {
priv->configured = 0;
ifec_scb_cmd ( netdev, virt_to_bus ( tcb ), CUStart );
ifec_scb_cmd_wait ( netdev );
return;
}
/* Resume if suspended. */
switch ( ( inw ( ioaddr + SCBStatus ) >> 6 ) & 0x3 ) {
case 0: /* Idle - We should not reach this state. */
DBG2 ( "ifec_tx_wake: tx idle!\n" );
ifec_scb_cmd ( netdev, virt_to_bus ( tcb ), CUStart );
ifec_scb_cmd_wait ( netdev );
return;
case 1: /* Suspended */
DBG2 ( "s" );
break;
default: /* Active */
DBG2 ( "a" );
}
ifec_scb_cmd_wait ( netdev );
outl ( 0, ioaddr + SCBPointer );
priv->tcb_head->command &= ~CmdSuspend;
/* Immediately issue Resume command */
outb ( CUResume, ioaddr + SCBCmd );
ifec_scb_cmd_wait ( netdev );
}
/*********************************************************************/
static struct pci_device_id ifec_nics[] = {
PCI_ROM(0x8086, 0x1029, "id1029", "Intel EtherExpressPro100 ID1029", 0),
PCI_ROM(0x8086, 0x1030, "id1030", "Intel EtherExpressPro100 ID1030", 0),
PCI_ROM(0x8086, 0x1031, "82801cam", "Intel 82801CAM (ICH3) Chipset Ethernet Controller", 0),
PCI_ROM(0x8086, 0x1032, "eepro100-1032", "Intel PRO/100 VE Network Connection", 0),
PCI_ROM(0x8086, 0x1033, "eepro100-1033", "Intel PRO/100 VM Network Connection", 0),
PCI_ROM(0x8086, 0x1034, "eepro100-1034", "Intel PRO/100 VM Network Connection", 0),
PCI_ROM(0x8086, 0x1035, "eepro100-1035", "Intel 82801CAM (ICH3) Chipset Ethernet Controller", 0),
PCI_ROM(0x8086, 0x1036, "eepro100-1036", "Intel 82801CAM (ICH3) Chipset Ethernet Controller", 0),
PCI_ROM(0x8086, 0x1037, "eepro100-1037", "Intel 82801CAM (ICH3) Chipset Ethernet Controller", 0),
PCI_ROM(0x8086, 0x1038, "id1038", "Intel PRO/100 VM Network Connection", 0),
PCI_ROM(0x8086, 0x1039, "82562et", "Intel PRO100 VE 82562ET", 0),
PCI_ROM(0x8086, 0x103a, "id103a", "Intel Corporation 82559 InBusiness 10/100", 0),
PCI_ROM(0x8086, 0x103b, "82562etb", "Intel PRO100 VE 82562ETB", 0),
PCI_ROM(0x8086, 0x103c, "eepro100-103c", "Intel PRO/100 VM Network Connection", 0),
PCI_ROM(0x8086, 0x103d, "eepro100-103d", "Intel PRO/100 VE Network Connection", 0),
PCI_ROM(0x8086, 0x103e, "eepro100-103e", "Intel PRO/100 VM Network Connection", 0),
PCI_ROM(0x8086, 0x1051, "prove", "Intel PRO/100 VE Network Connection", 0),
PCI_ROM(0x8086, 0x1059, "82551qm", "Intel PRO/100 M Mobile Connection", 0),
PCI_ROM(0x8086, 0x1209, "82559er", "Intel EtherExpressPro100 82559ER", 0),
PCI_ROM(0x8086, 0x1227, "82865", "Intel 82865 EtherExpress PRO/100A", 0),
PCI_ROM(0x8086, 0x1228, "82556", "Intel 82556 EtherExpress PRO/100 Smart", 0),
PCI_ROM(0x8086, 0x1229, "eepro100", "Intel EtherExpressPro100", 0),
PCI_ROM(0x8086, 0x2449, "82562em", "Intel EtherExpressPro100 82562EM", 0),
PCI_ROM(0x8086, 0x2459, "82562-1", "Intel 82562 based Fast Ethernet Connection", 0),
PCI_ROM(0x8086, 0x245d, "82562-2", "Intel 82562 based Fast Ethernet Connection", 0),
PCI_ROM(0x8086, 0x1050, "82562ez", "Intel 82562EZ Network Connection", 0),
PCI_ROM(0x8086, 0x1051, "eepro100-1051", "Intel 82801EB/ER (ICH5/ICH5R) Chipset Ethernet Controller", 0),
PCI_ROM(0x8086, 0x1065, "82562-3", "Intel 82562 based Fast Ethernet Connection", 0),
PCI_ROM(0x8086, 0x5200, "eepro100-5200", "Intel EtherExpress PRO/100 Intelligent Server", 0),
PCI_ROM(0x8086, 0x5201, "eepro100-5201", "Intel EtherExpress PRO/100 Intelligent Server", 0),
PCI_ROM(0x8086, 0x1092, "82562-3", "Intel Pro/100 VE Network", 0),
PCI_ROM(0x8086, 0x27dc, "eepro100-27dc", "Intel 82801G (ICH7) Chipset Ethernet Controller", 0),
};
/* Cards with device ids 0x1030 to 0x103F, 0x2449, 0x2459 or 0x245D might need
* a workaround for hardware bug on 10 mbit half duplex (see linux driver eepro100.c)
* 2003/03/17 gbaum */
struct pci_driver ifec_driver __pci_driver = {
.ids = ifec_nics,
.id_count = ( sizeof (ifec_nics) / sizeof (ifec_nics[0]) ),
.probe = ifec_pci_probe,
.remove = ifec_pci_remove
};
/*
* Local variables:
* c-basic-offset: 8
* c-indent-level: 8
* tab-width: 8
* End:
*/
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