v4.19.13 snapshot.
diff --git a/drivers/scsi/aacraid/nark.c b/drivers/scsi/aacraid/nark.c
new file mode 100644
index 0000000..c59074e
--- /dev/null
+++ b/drivers/scsi/aacraid/nark.c
@@ -0,0 +1,85 @@
+/*
+ * Adaptec AAC series RAID controller driver
+ *
+ * based on the old aacraid driver that is..
+ * Adaptec aacraid device driver for Linux.
+ *
+ * Copyright (c) 2000-2010 Adaptec, Inc.
+ * 2010-2015 PMC-Sierra, Inc. (aacraid@pmc-sierra.com)
+ * 2016-2017 Microsemi Corp. (aacraid@microsemi.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Module Name:
+ * nark.c
+ *
+ * Abstract: Hardware Device Interface for NEMER/ARK
+ *
+ */
+
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+
+#include <scsi/scsi_host.h>
+
+#include "aacraid.h"
+
+/**
+ * aac_nark_ioremap
+ * @size: mapping resize request
+ *
+ */
+static int aac_nark_ioremap(struct aac_dev * dev, u32 size)
+{
+ if (!size) {
+ iounmap(dev->regs.rx);
+ dev->regs.rx = NULL;
+ iounmap(dev->base);
+ dev->base = NULL;
+ return 0;
+ }
+ dev->base_start = pci_resource_start(dev->pdev, 2);
+ dev->regs.rx = ioremap((u64)pci_resource_start(dev->pdev, 0) |
+ ((u64)pci_resource_start(dev->pdev, 1) << 32),
+ sizeof(struct rx_registers) - sizeof(struct rx_inbound));
+ dev->base = NULL;
+ if (dev->regs.rx == NULL)
+ return -1;
+ dev->base = ioremap(dev->base_start, size);
+ if (dev->base == NULL) {
+ iounmap(dev->regs.rx);
+ dev->regs.rx = NULL;
+ return -1;
+ }
+ dev->IndexRegs = &((struct rx_registers __iomem *)dev->base)->IndexRegs;
+ return 0;
+}
+
+/**
+ * aac_nark_init - initialize an NEMER/ARK Split Bar card
+ * @dev: device to configure
+ *
+ */
+
+int aac_nark_init(struct aac_dev * dev)
+{
+ /*
+ * Fill in the function dispatch table.
+ */
+ dev->a_ops.adapter_ioremap = aac_nark_ioremap;
+ dev->a_ops.adapter_comm = aac_rx_select_comm;
+
+ return _aac_rx_init(dev);
+}