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- /*
- * 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 "isa.h"
- #include "io.h"
- #include "timer.h"
- #include "string.h"
- #include "console.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;
-
- /*
- * We need an ID port, if we don't already have one.
- *
- */
- if ( ! t509->id_port ) {
- if ( ! find_id_port ( t509 ) ) {
- DBG ( "No ID port available for contention select\n" );
- return 0;
- }
- DBG ( "T509 scan using ID port at %hx\n", t509->id_port );
- }
-
- /*
- * 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 */
-
- DBG ( "T509 found at %hx (tagged as %hhx)\n", t509->ioaddr,
- t509->current_tag );
-
- 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;
- }
-
- /* 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 );
-
- ISA_ROM ( "3c509","3c509" );
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