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/*
* Copyright (C) 2010 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 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/nvs.h>
#include <ipxe/pci.h>
#include <ipxe/pcivpd.h>
#include <ipxe/nvo.h>
#include <ipxe/nvsvpd.h>
/** @file
*
* Non-Volatile Storage using Vital Product Data
*
*/
/**
* Read from VPD field
*
* @v nvs NVS device
* @v field VPD field descriptor
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
static int nvs_vpd_read ( struct nvs_device *nvs, unsigned int field,
void *data, size_t len ) {
struct nvs_vpd_device *nvsvpd =
container_of ( nvs, struct nvs_vpd_device, nvs );
struct pci_device *pci = nvsvpd->vpd.pci;
unsigned int address;
size_t max_len;
int rc;
/* Allow reading non-existent field */
if ( len == 0 )
return 0;
/* Locate VPD field */
if ( ( rc = pci_vpd_find ( &nvsvpd->vpd, field, &address,
&max_len ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS VPD could not locate field "
PCI_VPD_FIELD_FMT ": %s\n", PCI_ARGS ( pci ),
PCI_VPD_FIELD_ARGS ( field ), strerror ( rc ) );
return rc;
}
/* Sanity check */
if ( len > max_len ) {
DBGC ( pci, PCI_FMT " NVS VPD cannot read %#02zx bytes "
"beyond field " PCI_VPD_FIELD_FMT " at [%04x,%04zx)\n",
PCI_ARGS ( pci ), len, PCI_VPD_FIELD_ARGS ( field ),
address, ( address + max_len ) );
return -ENXIO;
}
/* Read from VPD field */
if ( ( rc = pci_vpd_read ( &nvsvpd->vpd, address, data, len ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS VPD could not read field "
PCI_VPD_FIELD_FMT " at [%04x,%04zx): %s\n",
PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ),
address, ( address + len ), strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Write to VPD field
*
* @v nvs NVS device
* @v field VPD field descriptor
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
static int nvs_vpd_write ( struct nvs_device *nvs, unsigned int field,
const void *data, size_t len ) {
struct nvs_vpd_device *nvsvpd =
container_of ( nvs, struct nvs_vpd_device, nvs );
struct pci_device *pci = nvsvpd->vpd.pci;
unsigned int address;
size_t max_len;
int rc;
/* Locate VPD field */
if ( ( rc = pci_vpd_find ( &nvsvpd->vpd, field, &address,
&max_len ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS VPD could not locate field "
PCI_VPD_FIELD_FMT ": %s\n", PCI_ARGS ( pci ),
PCI_VPD_FIELD_ARGS ( field ), strerror ( rc ) );
return rc;
}
/* Sanity check */
if ( len > max_len ) {
DBGC ( pci, PCI_FMT " NVS VPD cannot write %#02zx bytes "
"beyond field " PCI_VPD_FIELD_FMT " at [%04x,%04zx)\n",
PCI_ARGS ( pci ), len, PCI_VPD_FIELD_ARGS ( field ),
address, ( address + max_len ) );
return -ENXIO;
}
/* Write field */
if ( ( rc = pci_vpd_write ( &nvsvpd->vpd, address, data,
len ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS VPD could not write field "
PCI_VPD_FIELD_FMT " at [%04x,%04zx): %s\n",
PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ),
address, ( address + len ), strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Resize VPD field
*
* @v nvs NVS device
* @v field VPD field descriptor
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*/
static int nvs_vpd_resize ( struct nvs_device *nvs, unsigned int field,
size_t len ) {
struct nvs_vpd_device *nvsvpd =
container_of ( nvs, struct nvs_vpd_device, nvs );
struct pci_device *pci = nvsvpd->vpd.pci;
unsigned int address;
int rc;
/* Resize field */
if ( ( rc = pci_vpd_resize ( &nvsvpd->vpd, field, len,
&address ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS VPD could not resize field "
PCI_VPD_FIELD_FMT " to %#02zx bytes: %s\n",
PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ),
len, strerror ( rc ) );
return rc;
}
return 0;
}
/**
* Initialise NVS VPD device
*
* @v nvsvpd NVS VPD device
* @v pci PCI device
* @ret rc Return status code
*/
int nvs_vpd_init ( struct nvs_vpd_device *nvsvpd, struct pci_device *pci ) {
int rc;
/* Initialise VPD device */
if ( ( rc = pci_vpd_init ( &nvsvpd->vpd, pci ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS could not initialise "
"VPD: %s\n", PCI_ARGS ( pci ), strerror ( rc ) );
return rc;
}
/* Initialise NVS device */
nvsvpd->nvs.read = nvs_vpd_read;
nvsvpd->nvs.write = nvs_vpd_write;
return 0;
}
/**
* Resize non-volatile option storage within NVS VPD device
*
* @v nvo Non-volatile options block
* @v len New length
* @ret rc Return status code
*/
static int nvs_vpd_nvo_resize ( struct nvo_block *nvo, size_t len ) {
int rc;
/* Resize VPD field */
if ( ( rc = nvs_vpd_resize ( nvo->nvs, nvo->address, len ) ) != 0 )
return rc;
return 0;
}
/**
* Initialise non-volatile option storage within NVS VPD device
*
* @v nvsvpd NVS VPD device
* @v field VPD field descriptor
* @v nvo Non-volatile options block
* @v refcnt Containing object reference counter, or NULL
*/
void nvs_vpd_nvo_init ( struct nvs_vpd_device *nvsvpd, unsigned int field,
struct nvo_block *nvo, struct refcnt *refcnt ) {
struct pci_device *pci = nvsvpd->vpd.pci;
unsigned int address;
size_t len;
int rc;
/* Locate VPD field, if present */
if ( ( rc = pci_vpd_find ( &nvsvpd->vpd, field, &address,
&len ) ) != 0 ) {
DBGC ( pci, PCI_FMT " NVS VPD field " PCI_VPD_FIELD_FMT
" not present; assuming empty\n",
PCI_ARGS ( pci ), PCI_VPD_FIELD_ARGS ( field ) );
len = 0;
}
/* Initialise non-volatile options block */
nvo_init ( nvo, &nvsvpd->nvs, field, len, nvs_vpd_nvo_resize, refcnt );
}
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