isci: fixup with testing from isci OROM in BIOS
Added fixups for the OROM parsing code after testing with BIOS OROM
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/scsi/isci/probe_roms.c b/drivers/scsi/isci/probe_roms.c
index 8222405..64e9a80 100644
--- a/drivers/scsi/isci/probe_roms.c
+++ b/drivers/scsi/isci/probe_roms.c
@@ -51,6 +51,10 @@
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;
@@ -58,13 +62,45 @@
len = pci_biosrom_size(pdev);
rom = devm_kzalloc(&pdev->dev, sizeof(*rom), GFP_KERNEL);
- for (i = 0; i < len && rom; i += ISCI_ROM_SIG_SIZE) {
- memcpy_fromio(rom->hdr.signature, oprom + i, ISCI_ROM_SIG_SIZE);
- if (memcmp(rom->hdr.signature, ISCI_ROM_SIG,
- ISCI_ROM_SIG_SIZE) == 0) {
- size_t copy_len = min(len - i, sizeof(*rom));
+ for (i = 0; i < len && rom; i += ISCI_OEM_SIG_SIZE) {
+ memcpy_fromio(oem_sig, oprom + i, ISCI_OEM_SIG_SIZE);
- memcpy_fromio(rom, oprom + i, copy_len);
+ /* 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;
}
}