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