[SCSI] pm80xx: IButton security feature support for motherboard controllers.

Signed-off-by: Anandkumar.Santhanam@pmcs.com
Reviewed-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 22 insertions, 1 deletions

diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index 0a2dc56ed9f6..c8a4465b74a5 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -967,6 +967,7 @@ pm80xx_chip_soft_rst(struct pm8001_hba_info *pm8001_ha)
 {
         u32 regval;
         u32 bootloader_state;
+        u32 ibutton0, ibutton1;
 
         /* Check if MPI is in ready state to reset */
         if (mpi_uninit_check(pm8001_ha) != 0) {
@@ -1025,7 +1026,27 @@ pm80xx_chip_soft_rst(struct pm8001_hba_info *pm8001_ha)
         if (-1 == check_fw_ready(pm8001_ha)) {
                 PM8001_FAIL_DBG(pm8001_ha,
                         pm8001_printk("Firmware is not ready!\n"));
-                return -EBUSY;
+                /* check iButton feature support for motherboard controller */
+                if (pm8001_ha->pdev->subsystem_vendor !=
+                        PCI_VENDOR_ID_ADAPTEC2 &&
+                        pm8001_ha->pdev->subsystem_vendor != 0) {
+                        ibutton0 = pm8001_cr32(pm8001_ha, 0,
+                                        MSGU_HOST_SCRATCH_PAD_6);
+                        ibutton1 = pm8001_cr32(pm8001_ha, 0,
+                                        MSGU_HOST_SCRATCH_PAD_7);
+                        if (!ibutton0 && !ibutton1) {
+                                PM8001_FAIL_DBG(pm8001_ha,
+                                        pm8001_printk("iButton Feature is"
+                                        " not Available!!!\n"));
+                                return -EBUSY;
+                        }
+                        if (ibutton0 == 0xdeadbeef && ibutton1 == 0xdeadbeef) {
+                                PM8001_FAIL_DBG(pm8001_ha,
+                                        pm8001_printk("CRC Check for iButton"
+                                        " Feature Failed!!!\n"));
+                                return -EBUSY;
+                        }
+                }
         }
         PM8001_INIT_DBG(pm8001_ha,
                 pm8001_printk("SPCv soft reset Complete\n"));