262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
/*
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* Split out into 3c509.c and 3c5x9.c, to make it possible to build a
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* 3c529 module without including ISA, ISAPnP and EISA code.
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*
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*/
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#include "eisa.h"
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#include "isa.h"
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#include "io.h"
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#include "timer.h"
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#include "string.h"
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#include "etherboot.h"
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#include "3c509.h"
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/*
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* 3c509 cards have their own method of contention resolution; this
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* effectively defines another bus type.
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*
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*/
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/*
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* A physical t509 device
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*
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*/
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struct t509_device {
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char *magic; /* must be first */
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uint16_t id_port;
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uint16_t ioaddr;
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unsigned char current_tag;
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};
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/*
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* A t509 driver
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*
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*/
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struct t509_driver {
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char *name;
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};
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/*
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* Ensure that there is sufficient space in the shared dev_bus
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* structure for a struct pci_device.
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*
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*/
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DEV_BUS( struct t509_device, t509_dev );
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static char t509_magic[0]; /* guaranteed unique symbol */
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/*
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* Find a port that can be used for contention select
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*
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* Called only once, so inlined for efficiency.
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*
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*/
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static inline int find_id_port ( struct t509_device *t509 ) {
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for ( t509->id_port = EP_ID_PORT_START ;
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t509->id_port < EP_ID_PORT_END ;
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t509->id_port += EP_ID_PORT_INC ) {
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outb ( 0x00, t509->id_port );
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outb ( 0xff, t509->id_port );
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if ( inb ( t509->id_port ) & 0x01 ) {
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/* Found a suitable port */
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return 1;
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}
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}
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/* No id port available */
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return 0;
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}
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/*
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* Send ID sequence to the ID port
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*
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* Called only once, so inlined for efficiency.
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*
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*/
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static inline void send_id_sequence ( struct t509_device *t509 ) {
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unsigned short lrs_state, i;
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outb ( 0x00, t509->id_port );
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outb ( 0x00, t509->id_port );
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lrs_state = 0xff;
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for ( i = 0; i < 255; i++ ) {
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outb ( lrs_state, t509->id_port );
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lrs_state <<= 1;
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lrs_state = lrs_state & 0x100 ? lrs_state ^ 0xcf : lrs_state;
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}
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}
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/*
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* We get eeprom data from the id_port given an offset into the eeprom.
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* Basically; after the ID_sequence is sent to all of the cards; they enter
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* the ID_CMD state where they will accept command requests. 0x80-0xbf loads
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* the eeprom data. We then read the port 16 times and with every read; the
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* cards check for contention (ie: if one card writes a 0 bit and another
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* writes a 1 bit then the host sees a 0. At the end of the cycle; each card
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* compares the data on the bus; if there is a difference then that card goes
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* into ID_WAIT state again). In the meantime; one bit of data is returned in
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* the AX register which is conveniently returned to us by inb(). Hence; we
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* read 16 times getting one bit of data with each read.
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*/
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static uint16_t id_read_eeprom ( struct t509_device *t509, int offset ) {
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int i, data = 0;
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outb ( 0x80 + offset, t509->id_port );
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/* Do we really need this wait? Won't be noticeable anyway */
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udelay(10000);
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for ( i = 0; i < 16; i++ ) {
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data = ( data << 1 ) | ( inw ( t509->id_port ) & 1 );
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}
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return data;
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}
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/*
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* Find the next t509 device
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*
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* Called only once, so inlined for efficiency.
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*
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*/
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static inline int fill_t509_device ( struct t509_device *t509 ) {
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int i;
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uint16_t iobase;
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/*
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* If this is the start of the scan, clear all tag registers.
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* Otherwise, tell already-found NICs not to respond.
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*
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*/
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if ( t509->current_tag == 0 ) {
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outb ( 0xd0, t509->id_port );
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} else {
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outb ( 0xd8, t509->id_port ) ;
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}
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/* Send the ID sequence */
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send_id_sequence ( t509 );
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/* Check the manufacturer ID */
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if ( id_read_eeprom ( t509, EEPROM_MFG_ID ) != MFG_ID ) {
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/* No more t509 devices */
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return 0;
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}
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/* Do contention select by reading the MAC address */
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for ( i = 0 ; i < 3 ; i++ ) {
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id_read_eeprom ( t509, i );
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}
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/* By now, only one device will be left active. Get its I/O
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* address, tag and activate the adaptor. Tagging will
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* prevent it taking part in the next scan, enabling us to see
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* the next device.
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*/
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iobase = id_read_eeprom ( t509, EEPROM_ADDR_CFG );
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t509->ioaddr = 0x200 + ( ( iobase & 0x1f ) << 4 );
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outb ( ++t509->current_tag, t509->id_port ); /* tag */
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outb ( ( 0xe0 | iobase ), t509->id_port ); /* activate */
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return 1;
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}
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/*
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* Find a t509 device matching the specified driver. ("Matching the
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* specified driver" is, in this case, a no-op, but we want to
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* preserve the common bus API).
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*
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* Called only once, so inlined for efficiency.
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*
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*/
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static inline int find_t509_device ( struct t509_device *t509,
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struct t509_driver *driver __unused ) {
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/* Initialise struct t509 if it's the first time it's been used. */
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if ( t509->magic != t509_magic ) {
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memset ( t509, 0, sizeof ( *t509 ) );
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t509->magic = t509_magic;
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if ( ! find_id_port ( t509 ) ) {
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DBG ( "No ID port available for contention select\n" );
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return 0;
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}
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}
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/* Find the next t509 device */
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if ( ! fill_t509_device ( t509 ) )
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return 0;
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return 1;
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}
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/*
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* Find the next T509 device that can be used to boot using the
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* specified driver.
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*
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*/
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int find_t509_boot_device ( struct dev *dev, struct t509_driver *driver ) {
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struct t509_device *t509 = ( struct t509_device * )dev->bus;
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if ( ! find_t509_device ( t509, driver ) )
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return 0;
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dev->name = driver->name;
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dev->devid.bus_type = ISA_BUS_TYPE;
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dev->devid.vendor_id = MFG_ID;
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dev->devid.device_id = PROD_ID;
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return 1;
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}
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/*
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* The ISA probe function
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*
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*/
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static int el3_t509_probe ( struct dev *dev, struct t509_device *t509 ) {
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struct nic *nic = nic_device ( dev );
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nic->ioaddr = t509->ioaddr;
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nic->irqno = 0;
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printf ( "3c509 board on ISA at %#hx - ", nic->ioaddr );
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/* Hand off to generic t5x9 probe routine */
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return t5x9_probe ( nic, ISA_PROD_ID ( PROD_ID ), ISA_PROD_ID_MASK );
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}
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static struct t509_driver el3_t509_driver = { "3c509 (ISA)" };
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BOOT_DRIVER ( "3c509", find_t509_boot_device, el3_t509_driver,
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el3_t509_probe );
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/*
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* The EISA probe function
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*
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*/
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static int el3_eisa_probe ( struct dev *dev, struct eisa_device *eisa ) {
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struct nic *nic = nic_device ( dev );
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enable_eisa_device ( eisa );
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nic->ioaddr = eisa->ioaddr;
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nic->irqno = 0;
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printf ( "3C5x9 board on EISA at %#hx - ", nic->ioaddr );
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/* Hand off to generic t5x9 probe routine */
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return t5x9_probe ( nic, ISA_PROD_ID ( PROD_ID ), ISA_PROD_ID_MASK );
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}
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static struct eisa_id el3_eisa_adapters[] = {
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{ "3Com 3c509 EtherLink III (EISA)", MFG_ID, PROD_ID },
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};
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static struct eisa_driver el3_eisa_driver =
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EISA_DRIVER ( "3c509 (EISA)", el3_eisa_adapters );
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BOOT_DRIVER ( "3c509 (EISA)", find_eisa_boot_device, el3_eisa_driver,
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el3_eisa_probe );
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/*
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* We currently build both ISA and EISA support into a single ROM
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* image, though there's no reason why this couldn't be split to
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* reduce code size; just split this .c file into two in the obvious
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* place.
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*
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*/
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ISA_ROM ( "3c509","3c509, ISA/EISA" );
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