hisi_sas: Add initial bare main driver

This patch adds the initial bare main driver for the HiSilicon SAS
HBA. This only introduces the changes to build and load the main driver
module.

The complete driver consists of the core main module and also a module
platform driver for driving the hw.

The HBA is a platform device.

Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/Kconfig

@@ -473,6 +473,7 @@ config SCSI_AACRAID
 source "drivers/scsi/aic7xxx/Kconfig.aic7xxx"
 source "drivers/scsi/aic7xxx/Kconfig.aic79xx"
 source "drivers/scsi/aic94xx/Kconfig"
+source "drivers/scsi/hisi_sas/Kconfig"
 source "drivers/scsi/mvsas/Kconfig"
 
 config SCSI_MVUMI

drivers/scsi/Makefile

@@ -157,6 +157,7 @@ obj-$(CONFIG_CHR_DEV_SCH)	+= ch.o
 obj-$(CONFIG_SCSI_ENCLOSURE)	+= ses.o
 
 obj-$(CONFIG_SCSI_OSD_INITIATOR) += osd/
+obj-$(CONFIG_SCSI_HISI_SAS) += hisi_sas/
 
 # This goes last, so that "real" scsi devices probe earlier
 obj-$(CONFIG_SCSI_DEBUG)	+= scsi_debug.o

drivers/scsi/hisi_sas/Kconfig

@@ -0,0 +1,6 @@
+config SCSI_HISI_SAS
+	tristate "HiSilicon SAS"
+	select SCSI_SAS_LIBSAS
+	select BLK_DEV_INTEGRITY
+	help
+		This driver supports HiSilicon's SAS HBA

drivers/scsi/hisi_sas/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_SCSI_HISI_SAS)		+= hisi_sas_main.o

drivers/scsi/hisi_sas/hisi_sas.h

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2015 Linaro Ltd.
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * 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 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#ifndef _HISI_SAS_H_
+#define _HISI_SAS_H_
+
+#include <linux/dmapool.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <scsi/libsas.h>
+
+#define DRV_VERSION "v1.0"
+
+#endif

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2015 Linaro Ltd.
+ * Copyright (c) 2015 Hisilicon Limited.
+ *
+ * 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 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include "hisi_sas.h"
+#define DRV_NAME "hisi_sas"
+
+static struct scsi_transport_template *hisi_sas_stt;
+
+static struct sas_domain_function_template hisi_sas_transport_ops = {
+};
+
+static __init int hisi_sas_init(void)
+{
+	pr_info("hisi_sas: driver version %s\n", DRV_VERSION);
+
+	hisi_sas_stt = sas_domain_attach_transport(&hisi_sas_transport_ops);
+	if (!hisi_sas_stt)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static __exit void hisi_sas_exit(void)
+{
+	sas_release_transport(hisi_sas_stt);
+}
+
+module_init(hisi_sas_init);
+module_exit(hisi_sas_exit);
+
+MODULE_VERSION(DRV_VERSION);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("John Garry <john.garry@huawei.com>");
+MODULE_DESCRIPTION("HISILICON SAS controller driver");
+MODULE_ALIAS("platform:" DRV_NAME);