/**
* Get underlying PCI device information
*
* @v efidev EFI device
* @v dev Generic device to fill in
* @ret rc Return status code
*/
static int snpnet_pci_info ( struct efi_device *efidev, struct device *dev ) {
EFI_HANDLE device = efidev->device;
EFI_HANDLE pci_device;
struct pci_device pci;
int rc;
/* Find parent PCI device */
if ( ( rc = efi_locate_device ( device, &efi_pci_io_protocol_guid,
&pci_device ) ) != 0 ) {
DBGC ( device, "SNP %p %s is not a PCI device: %s\n",
device, efi_handle_name ( device ), strerror ( rc ) );
return rc;
}
/* Get PCI device information */
if ( ( rc = efipci_info ( pci_device, &pci ) ) != 0 ) {
DBGC ( device, "SNP %p %s could not get PCI information: %s\n",
device, efi_handle_name ( device ), strerror ( rc ) );
return rc;
}
/* Populate SNP device information */
memcpy ( &dev->desc, &pci.dev.desc, sizeof ( dev->desc ) );
snprintf ( dev->name, sizeof ( dev->name ), "SNP-%s", pci.dev.name );
return 0;
}
/**
* Open PCI I/O protocol and identify BARs
*
* @v nii NII NIC
* @ret rc Return status code
*/
static int nii_pci_open ( struct nii_nic *nii ) {
EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
EFI_HANDLE device = nii->efidev->device;
EFI_HANDLE pci_device;
union {
EFI_PCI_IO_PROTOCOL *pci_io;
void *interface;
} pci_io;
union {
EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *acpi;
void *resource;
} desc;
unsigned int bar;
EFI_STATUS efirc;
int rc;
/* Locate PCI I/O protocol */
if ( ( rc = efi_locate_device ( device, &efi_pci_io_protocol_guid,
&pci_device ) ) != 0 ) {
DBGC ( nii, "NII %s could not locate PCI I/O protocol: %s\n",
nii->dev.name, strerror ( rc ) );
goto err_locate;
}
nii->pci_device = pci_device;
/* Open PCI I/O protocol */
if ( ( efirc = bs->OpenProtocol ( pci_device, &efi_pci_io_protocol_guid,
&pci_io.interface, efi_image_handle,
device,
EFI_OPEN_PROTOCOL_GET_PROTOCOL ))!=0){
rc = -EEFI ( efirc );
DBGC ( nii, "NII %s could not open PCI I/O protocol: %s\n",
nii->dev.name, strerror ( rc ) );
goto err_open;
}
nii->pci_io = pci_io.pci_io;
/* Identify memory and I/O BARs */
nii->mem_bar = PCI_MAX_BAR;
nii->io_bar = PCI_MAX_BAR;
for ( bar = 0 ; bar < PCI_MAX_BAR ; bar++ ) {
efirc = nii->pci_io->GetBarAttributes ( nii->pci_io, bar, NULL,
&desc.resource );
if ( efirc == EFI_UNSUPPORTED ) {
/* BAR not present; ignore */
continue;
}
if ( efirc != 0 ) {
rc = -EEFI ( efirc );
DBGC ( nii, "NII %s could not get BAR %d attributes: "
"%s\n", nii->dev.name, bar, strerror ( rc ) );
goto err_get_bar_attributes;
}
if ( desc.acpi->ResType == ACPI_ADDRESS_SPACE_TYPE_MEM ) {
nii->mem_bar = bar;
} else if ( desc.acpi->ResType == ACPI_ADDRESS_SPACE_TYPE_IO ) {
nii->io_bar = bar;
}
bs->FreePool ( desc.resource );
}
DBGC ( nii, "NII %s has ", nii->dev.name );
if ( nii->mem_bar < PCI_MAX_BAR ) {
DBGC ( nii, "memory BAR %d and ", nii->mem_bar );
} else {
DBGC ( nii, "no memory BAR and " );
}
if ( nii->io_bar < PCI_MAX_BAR ) {
DBGC ( nii, "I/O BAR %d\n", nii->io_bar );
} else {
DBGC ( nii, "no I/O BAR\n" );
}
return 0;
err_get_bar_attributes:
bs->CloseProtocol ( pci_device, &efi_pci_io_protocol_guid,
efi_image_handle, device );
err_open:
err_locate:
return rc;
}