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#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <ipxe/io.h>
#include <unistd.h>
#include <ipxe/eisa.h>
FILE_LICENCE ( GPL2_OR_LATER );
static void eisabus_remove ( struct root_device *rootdev );
/**
* Reset and enable/disable an EISA device
*
* @v eisa EISA device
* @v enabled 1=enable, 0=disable
*/
void eisa_device_enabled ( struct eisa_device *eisa, int enabled ) {
/* Set reset line high for 1000 �s. Spec says 500 �s, but
* this doesn't work for all cards, so we are conservative.
*/
outb ( EISA_CMD_RESET, eisa->ioaddr + EISA_GLOBAL_CONFIG );
udelay ( 1000 ); /* Must wait 800 */
/* Set reset low and write a 1 to ENABLE. Delay again, in
* case the card takes a while to wake up.
*/
outb ( enabled ? EISA_CMD_ENABLE : 0,
eisa->ioaddr + EISA_GLOBAL_CONFIG );
udelay ( 1000 ); /* Must wait 800 */
DBG ( "EISA %s device %02x\n", ( enabled ? "enabled" : "disabled" ),
eisa->slot );
}
/**
* Probe an EISA device
*
* @v eisa EISA device
* @ret rc Return status code
*
* Searches for a driver for the EISA device. If a driver is found,
* its probe() routine is called.
*/
static int eisa_probe ( struct eisa_device *eisa ) {
struct eisa_driver *driver;
struct eisa_device_id *id;
unsigned int i;
int rc;
DBG ( "Adding EISA device %02x (%04x:%04x (\"%s\") io %x)\n",
eisa->slot, eisa->vendor_id, eisa->prod_id,
isa_id_string ( eisa->vendor_id, eisa->prod_id ), eisa->ioaddr );
for_each_table_entry ( driver, EISA_DRIVERS ) {
for ( i = 0 ; i < driver->id_count ; i++ ) {
id = &driver->ids[i];
if ( id->vendor_id != eisa->vendor_id )
continue;
if ( ISA_PROD_ID ( id->prod_id ) !=
ISA_PROD_ID ( eisa->prod_id ) )
continue;
eisa->driver = driver;
eisa->dev.driver_name = id->name;
DBG ( "...using driver %s\n", eisa->dev.driver_name );
if ( ( rc = driver->probe ( eisa, id ) ) != 0 ) {
DBG ( "......probe failed\n" );
continue;
}
return 0;
}
}
DBG ( "...no driver found\n" );
return -ENOTTY;
}
/**
* Remove an EISA device
*
* @v eisa EISA device
*/
static void eisa_remove ( struct eisa_device *eisa ) {
eisa->driver->remove ( eisa );
DBG ( "Removed EISA device %02x\n", eisa->slot );
}
/**
* Probe EISA root bus
*
* @v rootdev EISA bus root device
*
* Scans the EISA bus for devices and registers all devices it can
* find.
*/
static int eisabus_probe ( struct root_device *rootdev ) {
struct eisa_device *eisa = NULL;
unsigned int slot;
int rc;
for ( slot = EISA_MIN_SLOT ; slot <= EISA_MAX_SLOT ; slot++ ) {
/* Allocate struct eisa_device */
if ( ! eisa )
eisa = malloc ( sizeof ( *eisa ) );
if ( ! eisa ) {
rc = -ENOMEM;
goto err;
}
memset ( eisa, 0, sizeof ( *eisa ) );
eisa->slot = slot;
eisa->ioaddr = EISA_SLOT_BASE ( eisa->slot );
/* Test for board present */
outb ( 0xff, eisa->ioaddr + EISA_VENDOR_ID );
eisa->vendor_id =
le16_to_cpu ( inw ( eisa->ioaddr + EISA_VENDOR_ID ) );
eisa->prod_id =
le16_to_cpu ( inw ( eisa->ioaddr + EISA_PROD_ID ) );
if ( eisa->vendor_id & 0x80 ) {
/* No board present */
continue;
}
/* Add to device hierarchy */
snprintf ( eisa->dev.name, sizeof ( eisa->dev.name ),
"EISA%02x", slot );
eisa->dev.desc.bus_type = BUS_TYPE_EISA;
eisa->dev.desc.vendor = eisa->vendor_id;
eisa->dev.desc.device = eisa->prod_id;
eisa->dev.parent = &rootdev->dev;
list_add ( &eisa->dev.siblings, &rootdev->dev.children );
INIT_LIST_HEAD ( &eisa->dev.children );
/* Look for a driver */
if ( eisa_probe ( eisa ) == 0 ) {
/* eisadev registered, we can drop our ref */
eisa = NULL;
} else {
/* Not registered; re-use struct */
list_del ( &eisa->dev.siblings );
}
}
free ( eisa );
return 0;
err:
free ( eisa );
eisabus_remove ( rootdev );
return rc;
}
/**
* Remove EISA root bus
*
* @v rootdev EISA bus root device
*/
static void eisabus_remove ( struct root_device *rootdev ) {
struct eisa_device *eisa;
struct eisa_device *tmp;
list_for_each_entry_safe ( eisa, tmp, &rootdev->dev.children,
dev.siblings ) {
eisa_remove ( eisa );
list_del ( &eisa->dev.siblings );
free ( eisa );
}
}
/** EISA bus root device driver */
static struct root_driver eisa_root_driver = {
.probe = eisabus_probe,
.remove = eisabus_remove,
};
/** EISA bus root device */
struct root_device eisa_root_device __root_device = {
.dev = { .name = "EISA" },
.driver = &eisa_root_driver,
};
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