Updated to new bus API, and improved using the 3c5x9 reference manual.
This commit is contained in:
Michael Brown
parent
441ee4f8f3
commit
139d0fe481
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@ -13,72 +13,116 @@
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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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* effectively defines another bus type similar to ISAPnP. Even the
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* original ISA cards can be programatically mapped to any I/O address
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* in the range 0x200-0x3e0.
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*
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* However, there is a small problem: once you've activated a card,
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* the only ways to deactivate it will also wipe its tag, meaning that
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* you won't be able to subsequently reactivate it without going
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* through the whole ID sequence again. The solution we adopt is to
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* isolate and tag all cards at the start, and to immediately
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* re-isolate and re-tag a card after disabling it.
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*
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*/
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static uint16_t t509_id_port = 0;
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static uint8_t t509_max_tag = 0;
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/*
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* A location on a t509 bus
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*
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*/
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struct t509_loc {
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uint8_t tag;
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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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uint8_t tag;
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};
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/*
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* A t509 driver
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* t509 utility functions
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*
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*/
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struct t509_driver {
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const char *name;
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};
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static inline void t509_set_id_port ( void ) {
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outb ( 0x00, t509_id_port );
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}
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static inline void t509_wait_for_id_sequence ( void ) {
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outb ( 0x00, t509_id_port );
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}
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static inline void t509_global_reset ( void ) {
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outb ( 0xc0, t509_id_port );
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}
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static inline void t509_reset_tag ( void ) {
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outb ( 0xd0, t509_id_port );
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}
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static inline void t509_set_tag ( uint8_t tag ) {
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outb ( 0xd0 | tag, t509_id_port );
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}
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static inline void t509_select_tag ( uint8_t tag ) {
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outb ( 0xd8 | tag, t509_id_port );
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}
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static inline void t509_activate ( uint16_t ioaddr ) {
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outb ( 0xe0 | ( ioaddr >> 4 ), t509_id_port );
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}
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static inline void t509_deactivate_and_reset_tag ( uint16_t ioaddr ) {
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outb ( GLOBAL_RESET, ioaddr + EP_COMMAND );
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}
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static inline void t509_load_eeprom_word ( uint8_t offset ) {
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outb ( 0x80 | offset, t509_id_port );
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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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* Find a suitable ID port
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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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static inline int t509_find_id_port ( void ) {
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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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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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t509_set_id_port ();
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/* See if anything's listening */
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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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DBG ( "T509 using ID port at %hx\n", t509_id_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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DBG ( "T509 found no available ID port\n" );
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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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static void t509_send_id_sequence ( void ) {
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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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t509_set_id_port ();
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/* Reset IDS on cards */
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t509_wait_for_id_sequence ();
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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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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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@ -96,142 +140,260 @@ static inline void send_id_sequence ( struct t509_device *t509 ) {
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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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static uint16_t t509_id_read_eeprom ( int offset ) {
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int i, data = 0;
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outb ( 0x80 + offset, t509->id_port );
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t509_load_eeprom_word ( offset );
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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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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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* Isolate and tag all t509 cards
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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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static void t509_isolate ( void ) {
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unsigned int i;
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uint16_t contend[3];
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/* Find a suitable ID port */
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if ( ! t509_find_id_port () )
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return;
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while ( 1 ) {
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/* All cards are in ID_WAIT state each time we go
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* through this loop.
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*/
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/* Send the ID sequence */
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t509_send_id_sequence ();
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/* First time through, reset all tags. On subsequent
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* iterations, kill off any already-tagged cards
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*/
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if ( t509_max_tag == 0 ) {
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t509_reset_tag();
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} else {
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t509_select_tag(0);
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}
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/* Read the manufacturer ID, to see if there are any
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* more cards
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*/
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if ( t509_id_read_eeprom ( EEPROM_MFG_ID ) != MFG_ID ) {
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DBG ( "T509 saw %s signs of life\n",
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t509_max_tag ? "no further" : "no" );
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break;
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}
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/* Perform contention selection on the MAC address */
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for ( i = 0 ; i < 3 ; i++ ) {
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contend[i] = t509_id_read_eeprom ( i );
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}
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/* Only one device will still be left alive. Tag it. */
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++t509_max_tag;
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DBG ( "T509 found card %hx%hx%hx, assigning tag %hhx\n",
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contend[0], contend[1], contend[2], t509_max_tag );
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t509_set_tag ( t509_max_tag );
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/* Return all cards back to ID_WAIT state */
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t509_wait_for_id_sequence();
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}
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DBG ( "T509 found %d cards using ID port %hx\n",
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t509_max_tag, t509_id_port );
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return;
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}
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/*
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* Increment a bus_loc structure to the next possible T509 location.
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* Leave the structure zeroed and return 0 if there are no more valid
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* locations.
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*
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*/
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static int t509_next_location ( struct bus_loc *bus_loc ) {
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struct t509_loc *t509_loc = ( struct t509_loc * ) bus_loc;
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/*
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* Ensure that there is sufficient space in the shared bus
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* structures for a struct t509_loc and a struct t509_dev,
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* as mandated by bus.h.
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*
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*/
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BUS_LOC_CHECK ( struct t509_loc );
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BUS_DEV_CHECK ( struct t509_device );
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return ( t509_loc->tag = ( ++t509_loc->tag & EP_TAG_MAX ) );
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}
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/*
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* Fill in parameters for a T509 device based on tag
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*
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* Return 1 if device present, 0 otherwise
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*
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*/
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static int t509_fill_device ( struct bus_dev *bus_dev,
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struct bus_loc *bus_loc ) {
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struct t509_device *t509 = ( struct t509_device * ) bus_dev;
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struct t509_loc *t509_loc = ( struct t509_loc * ) bus_loc;
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uint16_t iobase;
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/*
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* We need an ID port, if we don't already have one.
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*
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*/
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if ( ! t509->id_port ) {
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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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DBG ( "T509 scan using ID port at %hx\n", t509->id_port );
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}
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/* Copy tag to struct t509 */
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t509->tag = t509_loc->tag;
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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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/* Tag 0 is never valid, but may be passed in */
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if ( ! t509->tag )
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return 0;
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/* Perform isolation if it hasn't yet been done */
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if ( ! t509_id_port )
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t509_isolate();
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/* Check tag is in range */
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if ( t509->tag > t509_max_tag )
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return 0;
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/* Send the ID sequence */
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send_id_sequence ( t509 );
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t509_send_id_sequence ();
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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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/* Select the specified tag */
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t509_select_tag ( t509->tag );
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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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/* Read the default I/O address */
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iobase = t509_id_read_eeprom ( 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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DBG ( "T509 found at %hx (tagged as %hhx)\n", t509->ioaddr,
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t509->current_tag );
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/* Send card back to ID_WAIT */
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t509_wait_for_id_sequence();
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DBG ( "T509 found device %hhx, base %hx\n", t509->tag, t509->ioaddr );
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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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* Test whether or not a driver is capable of driving the device.
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* This is a no-op for T509.
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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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}
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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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static int t509_check_driver ( struct bus_dev *bus_dev __unused,
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struct device_driver *device_driver __unused ) {
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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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* Describe a T509 device
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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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static char * t509_describe ( struct bus_dev *bus_dev ) {
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struct t509_device *t509 = ( struct t509_device * ) bus_dev;
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static char t509_description[] = "T509 00";
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if ( ! find_t509_device ( t509, driver ) )
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return 0;
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sprintf ( t509_description + 4, "%hhx", t509->tag );
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return t509_description;
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}
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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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* Name a T509 device
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*
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*/
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static const char * t509_name ( struct bus_dev *bus_dev __unused ) {
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return "T509";
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}
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/*
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* T509 bus operations table
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*
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*/
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struct bus_driver t509_driver __bus_driver = {
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.next_location = t509_next_location,
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.fill_device = t509_fill_device,
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.check_driver = t509_check_driver,
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.describe = t509_describe,
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.name = t509_name,
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};
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/*
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* Activate a T509 device
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*
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* The device will be enabled at whatever ioaddr is specified in the
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* struct t509_device; there is no need to stick with the default
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* ioaddr read from the EEPROM.
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*
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*/
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static inline void activate_t509_device ( struct t509_device *t509 ) {
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t509_send_id_sequence ();
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t509_select_tag ( t509->tag );
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t509_activate ( t509->ioaddr );
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DBG ( "T509 activated device %hhx at ioaddr %hx\n",
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t509->tag, t509->ioaddr );
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}
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/*
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* Deactivate a T509 device
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*
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* Disabling also clears the tag, so we immediately isolate and re-tag
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* this card.
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*
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*/
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static inline void deactivate_t509_device ( struct t509_device *t509 ) {
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t509_deactivate_and_reset_tag ( t509->ioaddr );
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udelay ( 1000 );
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t509_send_id_sequence ();
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t509_select_tag ( 0 );
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t509_set_tag ( t509->tag );
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t509_wait_for_id_sequence ();
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DBG ( "T509 deactivated device at %hx and re-tagged as %hhx\n",
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t509->ioaddr, t509->tag );
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}
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/*
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* Fill in a nic structure
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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 t509_fill_nic ( struct nic *nic,
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struct t509_device *t509 ) {
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/* Fill in ioaddr and irqno */
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nic->ioaddr = t509->ioaddr;
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nic->irqno = 0;
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/* Fill in DHCP device ID structure */
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nic->dhcp_dev_id.bus_type = ISA_BUS_TYPE;
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nic->dhcp_dev_id.vendor_id = htons ( MFG_ID );
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nic->dhcp_dev_id.device_id = htons ( PROD_ID );
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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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static int el3_t509_probe ( struct nic *nic, struct t509_device *t509 ) {
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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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/* We could change t509->ioaddr if we wanted to */
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activate_t509_device ( t509 );
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t509_fill_nic ( nic, t509 );
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/* 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)" };
|
||||
static void el3_t509_disable ( struct nic *nic, struct t509_device *t509 ) {
|
||||
t5x9_disable ( nic );
|
||||
deactivate_t509_device ( t509 );
|
||||
}
|
||||
|
||||
BOOT_DRIVER ( "3c509", find_t509_boot_device, el3_t509_driver,
|
||||
el3_t509_probe );
|
||||
static struct {} el3_t509_driver;
|
||||
|
||||
ISA_ROM ( "3c509","3c509" );
|
||||
DRIVER ( "3c509", nic_driver, t509_driver, el3_t509_driver,
|
||||
el3_t509_probe, el3_t509_disable );
|
||||
|
||||
ISA_ROM ( "3c509", "3c509" );
|
||||
|
|
|
|||
Reference in New Issue