kernel-ark/drivers/scsi/isci/probe_roms.c
Dan Williams abec912d71 isci: refactor initialization for S3/S4
Based on an original implementation by Ed Nadolski and Artur Wojcik

In preparation for S3/S4 support refactor initialization so that
driver-load and resume-from-suspend can share the common init path of
isci_host_init().  Organize the initialization into objects that are
self-contained to the driver (initialized by isci_host_init) versus
those that have some upward registration (initialized at allocation time
asd_sas_phy, asd_sas_port, dma allocations).  The largest change is
moving the the validation of the oem and module parameters from
isci_host_init() to isci_host_alloc().

The S3/S4 approach being taken is that libsas will be tasked with
remembering the state of the domain and the lldd is free to be
forgetful.  In the case of isci we'll just re-init using a subset of the
normal driver load path.

[clean up some unused / mis-indented function definitions in host.h]

Signed-off-by: Ed Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2012-05-17 12:27:12 -07:00

232 lines
5.3 KiB
C

/*
* 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 "probe_roms.h"
static efi_char16_t isci_efivar_name[] = {
'R', 's', 't', 'S', 'c', 'u', 'O'
};
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;
}
struct isci_orom *isci_request_firmware(struct pci_dev *pdev, const struct firmware *fw)
{
struct isci_orom *orom = NULL, *data;
int i, j;
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);
if (is_c0(pdev) || is_c1(pdev))
goto out;
/*
* deprecated: override default amp_control for pre-preproduction
* silicon revisions
*/
for (i = 0; i < ARRAY_SIZE(orom->ctrl); i++)
for (j = 0; j < ARRAY_SIZE(orom->ctrl[i].phys); j++) {
orom->ctrl[i].phys[j].afe_tx_amp_control0 = 0xe7c03;
orom->ctrl[i].phys[j].afe_tx_amp_control1 = 0xe7c03;
orom->ctrl[i].phys[j].afe_tx_amp_control2 = 0xe7c03;
orom->ctrl[i].phys[j].afe_tx_amp_control3 = 0xe7c03;
}
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)
{
efi_status_t status;
struct isci_orom *rom;
struct isci_oem_hdr *oem_hdr;
u8 *tmp, sum;
int j;
unsigned long data_len;
u8 *efi_data;
u32 efi_attrib = 0;
data_len = 1024;
efi_data = devm_kzalloc(&pdev->dev, data_len, GFP_KERNEL);
if (!efi_data) {
dev_warn(&pdev->dev,
"Unable to allocate memory for EFI data\n");
return NULL;
}
rom = (struct isci_orom *)(efi_data + sizeof(struct isci_oem_hdr));
if (get_efi())
status = get_efi()->get_variable(isci_efivar_name,
&ISCI_EFI_VENDOR_GUID,
&efi_attrib,
&data_len,
efi_data);
else
status = EFI_NOT_FOUND;
if (status != EFI_SUCCESS) {
dev_warn(&pdev->dev,
"Unable to obtain EFI var data for OEM parms\n");
return NULL;
}
oem_hdr = (struct isci_oem_hdr *)efi_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 *)efi_data;
for (j = 0, sum = 0; j < (sizeof(*oem_hdr) + sizeof(*rom)); j++, tmp++)
sum += *tmp;
if (sum != 0) {
dev_warn(&pdev->dev,
"OEM table checksum failed\n");
return NULL;
}
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;
}