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