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/*
* Copyright (C) 2022 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stddef.h>
#include <stdint.h>
#include <errno.h>
#include <byteswap.h>
#include <ipxe/pci.h>
#include <ipxe/pcibridge.h>
/** @file
*
* PCI-to-PCI bridge
*
*/
/** List of all PCI bridges */
static LIST_HEAD ( pcibridges );
/**
* Find bridge attached to a PCI device
*
* @v pci PCI device
* @ret bridge PCI bridge, or NULL
*/
struct pci_bridge * pcibridge_find ( struct pci_device *pci ) {
unsigned int bus = PCI_BUS ( pci->busdevfn );
struct pci_bridge *bridge;
/* Find matching bridge */
list_for_each_entry ( bridge, &pcibridges, list ) {
if ( bus == bridge->secondary )
return bridge;
}
return NULL;
}
/**
* Probe PCI device
*
* @v pci PCI device
* @ret rc Return status code
*/
static int pcibridge_probe ( struct pci_device *pci ) {
struct pci_bridge *bridge;
uint16_t base;
uint16_t limit;
int rc;
/* Allocate and initialise structure */
bridge = zalloc ( sizeof ( *bridge ) );
if ( ! bridge ) {
rc = -ENOMEM;
goto err_alloc;
}
bridge->pci = pci;
/* Read configuration */
pci_read_config_dword ( pci, PCI_PRIMARY, &bridge->buses );
cpu_to_le32s ( &buses );
pci_read_config_word ( pci, PCI_MEM_BASE, &base );
bridge->membase = ( ( base & ~PCI_MEM_MASK ) << 16 );
pci_read_config_word ( pci, PCI_MEM_LIMIT, &limit );
bridge->memlimit = ( ( ( ( limit | PCI_MEM_MASK ) + 1 ) << 16 ) - 1 );
DBGC ( bridge, "BRIDGE " PCI_FMT " bus %02x to [%02x,%02x) mem "
"[%08x,%08x)\n", PCI_ARGS ( pci ), bridge->primary,
bridge->secondary, bridge->subordinate, bridge->membase,
bridge->memlimit );
/* Add to list of PCI bridges */
list_add ( &bridge->list, &pcibridges );
pci_set_drvdata ( pci, bridge );
return 0;
free ( bridge );
err_alloc:
return rc;
}
/**
* Remove PCI device
*
* @v pci PCI device
*/
static void pcibridge_remove ( struct pci_device *pci ) {
struct pci_bridge *bridge = pci_get_drvdata ( pci );
/* Remove from list of bridges */
list_del ( &bridge->list );
/* Free device */
free ( bridge );
}
/** Bridge PCI device IDs */
static struct pci_device_id pcibridge_ids[] = {
PCI_ROM ( 0xffff, 0xffff, "bridge", "Bridge", 0 ),
};
/** Bridge PCI driver */
struct pci_driver pcibridge_driver __pci_driver = {
.ids = pcibridge_ids,
.id_count = ( sizeof ( pcibridge_ids ) / sizeof ( pcibridge_ids[0] ) ),
.class = PCI_CLASS_ID ( PCI_CLASS_BRIDGE, PCI_CLASS_BRIDGE_PCI,
PCI_ANY_ID ),
.probe = pcibridge_probe,
.remove = pcibridge_remove,
};
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