/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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 St - Fifth Floor, Boston, MA 02110-1301 USA.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*/
/* probe_roms - scan for oem parameters */
#include <linux/kernel.h>
#include <linux/firmware.h>
#include <linux/uaccess.h>
#include <linux/efi.h>
#include <asm/probe_roms.h>
#include "isci.h"
#include "task.h"
#include "sci_controller_constants.h"
#include "sci_environment.h"
#include "probe_roms.h"
struct efi_variable {
efi_char16_t VariableName[1024/sizeof(efi_char16_t)];
efi_guid_t VendorGuid;
unsigned long DataSize;
__u8 Data[1024];
efi_status_t Status;
__u32 Attributes;
} __attribute__((packed));
struct isci_orom *isci_request_oprom(struct pci_dev *pdev)
{
void __iomem *oprom = pci_map_biosrom(pdev);
struct isci_orom *rom = NULL;
size_t len, i;
int j;
char oem_sig[4];
struct isci_oem_hdr oem_hdr;
u8 *tmp, sum;
if (!oprom)
return NULL;
len = pci_biosrom_size(pdev);
rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL);
if (!rom) {
dev_warn(&pdev->dev,
"Unable to allocate memory for orom\n");
return NULL;
}
for (i = 0; i < len && rom; i += ISCI_OEM_SIG_SIZE) {
memcpy_fromio(oem_sig, oprom + i, ISCI_OEM_SIG_SIZE);
/* we think we found the OEM table */
if (memcmp(oem_sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) == 0) {
size_t copy_len;
memcpy_fromio(&oem_hdr, oprom + i, sizeof(oem_hdr));
copy_len = min(oem_hdr.len - sizeof(oem_hdr),
sizeof(*rom));
memcpy_fromio(rom,
oprom + i + sizeof(oem_hdr),
copy_len);
/* calculate checksum */
tmp = (u8 *)&oem_hdr;
for (j = 0, sum = 0; j < sizeof(oem_hdr); j++, tmp++)
sum += *tmp;
tmp = (u8 *)rom;
for (j = 0; j < sizeof(*rom); j++, tmp++)
sum += *tmp;
if (sum != 0) {
dev_warn(&pdev->dev,
"OEM table checksum failed\n");
continue;
}
/* keep going if that's not the oem param table */
if (memcmp(rom->hdr.signature,
ISCI_ROM_SIG,
ISCI_ROM_SIG_SIZE) != 0)
continue;
dev_info(&pdev->dev,
"OEM parameter table found in OROM\n");
break;
}
}
if (i >= len) {
dev_err(&pdev->dev, "oprom parse error\n");
devm_kfree(&pdev->dev, rom);
rom = NULL;
}
pci_unmap_biosrom(oprom);
return rom;
}
/**
* isci_parse_oem_parameters() - This method will take OEM parameters
* from the module init parameters and copy them to oem_params. This will
* only copy values that are not set to the module parameter default values
* @oem_parameters: This parameter specifies the controller default OEM
* parameters. It is expected that this has been initialized to the default
* parameters for the controller
*
*
*/
enum sci_status isci_parse_oem_parameters(union scic_oem_parameters *oem_params,
struct isci_orom *orom, int scu_index)
{
/* check for valid inputs */
if (scu_index < 0 || scu_index > SCI_MAX_CONTROLLERS ||
scu_index > orom->hdr.num_elements || !oem_params)
return -EINVAL;
oem_params->sds1 = orom->ctrl[scu_index];
return 0;
}
struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw)
{
struct isci_orom *orom = NULL, *data;
if (request_firmware(&fw, ISCI_FW_NAME, &pdev->dev) != 0)
return NULL;
if (fw->size < sizeof(*orom))
goto out;
data = (struct isci_orom *)fw->data;
if (strncmp(ISCI_ROM_SIG, data->hdr.signature,
strlen(ISCI_ROM_SIG)) != 0)
goto out;
orom = devm_kzalloc(&pdev->dev, fw->size, GFP_KERNEL);
if (!orom)
goto out;
memcpy(orom, fw->data, fw->size);
out:
release_firmware(fw);
return orom;
}
static struct efi *get_efi(void)
{
#ifdef CONFIG_EFI
return &efi;
#else
return NULL;
#endif
}
struct isci_orom *isci_get_efi_var(struct pci_dev *pdev)
{
struct efi_variable *evar;
efi_status_t status;
struct isci_orom *rom = NULL;
struct isci_oem_hdr *oem_hdr;
u8 *tmp, sum;
int j;
size_t copy_len;
evar = devm_kzalloc(&pdev->dev,
sizeof(struct efi_variable),
GFP_KERNEL);
if (!evar) {
dev_warn(&pdev->dev,
"Unable to allocate memory for EFI var\n");
return NULL;
}
rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL);
if (!rom) {
dev_warn(&pdev->dev,
"Unable to allocate memory for orom\n");
return NULL;
}
for (j = 0; j < strlen(ISCI_EFI_VAR_NAME) + 1; j++)
evar->VariableName[j] = ISCI_EFI_VAR_NAME[j];
evar->DataSize = 1024;
evar->VendorGuid = ISCI_EFI_VENDOR_GUID;
evar->Attributes = ISCI_EFI_ATTRIBUTES;
if (get_efi())
status = get_efi()->get_variable(evar->VariableName,
&evar->VendorGuid,
&evar->Attributes,
&evar->DataSize,
evar->Data);
else
status = EFI_NOT_FOUND;
if (status != EFI_SUCCESS) {
dev_warn(&pdev->dev,
"Unable to obtain EFI variable for OEM parms\n");
return NULL;
}
oem_hdr = (struct isci_oem_hdr *)evar->Data;
if (memcmp(oem_hdr->sig, ISCI_OEM_SIG, ISCI_OEM_SIG_SIZE) != 0) {
dev_warn(&pdev->dev,
"Invalid OEM header signature\n");
return NULL;
}
/* calculate checksum */
tmp = (u8 *)oem_hdr;
for (j = 0, sum = 0; j < sizeof(oem_hdr); j++, tmp++)
sum += *tmp;
tmp = (u8 *)rom;
for (j = 0; j < sizeof(*rom); j++, tmp++)
sum += *tmp;
if (sum != 0) {
dev_warn(&pdev->dev,
"OEM table checksum failed\n");
return NULL;
}
copy_len = min_t(u16, evar->DataSize,
min_t(u16, oem_hdr->len - sizeof(*oem_hdr), sizeof(*rom)));
memcpy(rom, (char *)evar->Data + sizeof(*oem_hdr), copy_len);
if (memcmp(rom->hdr.signature,
ISCI_ROM_SIG,
ISCI_ROM_SIG_SIZE) != 0) {
dev_warn(&pdev->dev,
"Invalid OEM table signature\n");
return NULL;
}
return rom;
}
