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/*
* MCA bus driver code
*
* Abstracted from 3c509.c.
*
*/
FILE_LICENCE ( BSD2 );
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <gpxe/io.h>
#include <gpxe/mca.h>
static void mcabus_remove ( struct root_device *rootdev );
/**
* Probe an MCA device
*
* @v mca MCA device
* @ret rc Return status code
*
* Searches for a driver for the MCA device. If a driver is found,
* its probe() routine is called.
*/
static int mca_probe ( struct mca_device *mca ) {
struct mca_driver *driver;
struct mca_device_id *id;
unsigned int i;
int rc;
DBG ( "Adding MCA slot %02x (ID %04x POS "
"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x)\n",
mca->slot, MCA_ID ( mca ),
mca->pos[0], mca->pos[1], mca->pos[2], mca->pos[3],
mca->pos[4], mca->pos[5], mca->pos[6], mca->pos[7] );
for_each_table_entry ( driver, MCA_DRIVERS ) {
for ( i = 0 ; i < driver->id_count ; i++ ) {
id = &driver->ids[i];
if ( id->id != MCA_ID ( mca ) )
continue;
mca->driver = driver;
mca->driver_name = id->name;
DBG ( "...using driver %s\n", mca->driver_name );
if ( ( rc = driver->probe ( mca, id ) ) != 0 ) {
DBG ( "......probe failed\n" );
continue;
}
return 0;
}
}
DBG ( "...no driver found\n" );
return -ENOTTY;
}
/**
* Remove an MCA device
*
* @v mca MCA device
*/
static void mca_remove ( struct mca_device *mca ) {
mca->driver->remove ( mca );
DBG ( "Removed MCA device %02x\n", mca->slot );
}
/**
* Probe MCA root bus
*
* @v rootdev MCA bus root device
*
* Scans the MCA bus for devices and registers all devices it can
* find.
*/
static int mcabus_probe ( struct root_device *rootdev ) {
struct mca_device *mca = NULL;
unsigned int slot;
int seen_non_ff;
unsigned int i;
int rc;
for ( slot = 0 ; slot <= MCA_MAX_SLOT_NR ; slot++ ) {
/* Allocate struct mca_device */
if ( ! mca )
mca = malloc ( sizeof ( *mca ) );
if ( ! mca ) {
rc = -ENOMEM;
goto err;
}
memset ( mca, 0, sizeof ( *mca ) );
mca->slot = slot;
/* Make sure motherboard setup is off */
outb_p ( 0xff, MCA_MOTHERBOARD_SETUP_REG );
/* Select the slot */
outb_p ( 0x8 | ( mca->slot & 0xf ), MCA_ADAPTER_SETUP_REG );
/* Read the POS registers */
seen_non_ff = 0;
for ( i = 0 ; i < ( sizeof ( mca->pos ) /
sizeof ( mca->pos[0] ) ) ; i++ ) {
mca->pos[i] = inb_p ( MCA_POS_REG ( i ) );
if ( mca->pos[i] != 0xff )
seen_non_ff = 1;
}
/* Kill all setup modes */
outb_p ( 0, MCA_ADAPTER_SETUP_REG );
/* If all POS registers are 0xff, this means there's no device
* present
*/
if ( ! seen_non_ff )
continue;
/* Add to device hierarchy */
snprintf ( mca->dev.name, sizeof ( mca->dev.name ),
"MCA%02x", slot );
mca->dev.desc.bus_type = BUS_TYPE_MCA;
mca->dev.desc.vendor = GENERIC_MCA_VENDOR;
mca->dev.desc.device = MCA_ID ( mca );
mca->dev.parent = &rootdev->dev;
list_add ( &mca->dev.siblings, &rootdev->dev.children );
INIT_LIST_HEAD ( &mca->dev.children );
/* Look for a driver */
if ( mca_probe ( mca ) == 0 ) {
/* mcadev registered, we can drop our ref */
mca = NULL;
} else {
/* Not registered; re-use struct */
list_del ( &mca->dev.siblings );
}
}
free ( mca );
return 0;
err:
free ( mca );
mcabus_remove ( rootdev );
return rc;
}
/**
* Remove MCA root bus
*
* @v rootdev MCA bus root device
*/
static void mcabus_remove ( struct root_device *rootdev ) {
struct mca_device *mca;
struct mca_device *tmp;
list_for_each_entry_safe ( mca, tmp, &rootdev->dev.children,
dev.siblings ) {
mca_remove ( mca );
list_del ( &mca->dev.siblings );
free ( mca );
}
}
/** MCA bus root device driver */
static struct root_driver mca_root_driver = {
.probe = mcabus_probe,
.remove = mcabus_remove,
};
/** MCA bus root device */
struct root_device mca_root_device __root_device = {
.dev = { .name = "MCA" },
.driver = &mca_root_driver,
};
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