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/*
* Copyright (C) 2013 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.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdio.h>
#include <errno.h>
#include <ipxe/pci.h>
#include <ipxe/settings.h>
#include <ipxe/init.h>
/** @file
*
* PCI device settings
*
*/
/** PCI device settings scope */
static const struct settings_scope pci_settings_scope;
/**
* Check applicability of PCI device setting
*
* @v settings Settings block
* @v setting Setting
* @ret applies Setting applies within this settings block
*/
static int pci_settings_applies ( struct settings *settings __unused,
const struct setting *setting ) {
return ( setting->scope == &pci_settings_scope );
}
/**
* Fetch value of PCI device setting
*
* @v settings Settings block
* @v setting Setting to fetch
* @v data Buffer to fill with setting data
* @v len Length of buffer
* @ret len Length of setting data, or negative error
*/
static int pci_settings_fetch ( struct settings *settings __unused,
struct setting *setting,
void *data, size_t len ) {
struct pci_device pci;
unsigned int tag_busdevfn;
unsigned int tag_offset;
unsigned int tag_len;
unsigned int i;
/* Extract busdevfn, offset, and length from tag */
tag_busdevfn = ( ( setting->tag >> 16 ) & 0xffff );
tag_offset = ( ( setting->tag >> 8 ) & 0xff );
tag_len = ( ( setting->tag >> 0 ) & 0xff );
/* Locate PCI device */
memset ( &pci, 0, sizeof ( pci ) );
pci_init ( &pci, tag_busdevfn );
DBG ( PCI_FMT " reading %#02x+%#x\n", PCI_ARGS ( &pci ),
tag_offset, tag_len );
/* Read data one byte at a time, in reverse order (since PCI
* is little-endian and iPXE settings are essentially
* big-endian).
*/
tag_offset += tag_len;
for ( i = 0 ; ( ( i < tag_len ) && ( i < len ) ); i++ ) {
pci_read_config_byte ( &pci, --tag_offset, data++ );
}
/* Set type to ":hexraw" if not already specified */
if ( ! setting->type )
setting->type = &setting_type_hexraw;
return tag_len;
}
/** PCI device settings operations */
static struct settings_operations pci_settings_operations = {
.applies = pci_settings_applies,
.fetch = pci_settings_fetch,
};
/** PCI device settings */
static struct settings pci_settings = {
.refcnt = NULL,
.siblings = LIST_HEAD_INIT ( pci_settings.siblings ),
.children = LIST_HEAD_INIT ( pci_settings.children ),
.op = &pci_settings_operations,
.default_scope = &pci_settings_scope,
};
/** Initialise PCI device settings */
static void pci_settings_init ( void ) {
int rc;
if ( ( rc = register_settings ( &pci_settings, NULL, "pci" ) ) != 0 ) {
DBG ( "PCI could not register settings: %s\n",
strerror ( rc ) );
return;
}
}
/** PCI device settings initialiser */
struct init_fn pci_settings_init_fn __init_fn ( INIT_NORMAL ) = {
.initialise = pci_settings_init,
};
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