[RFC 13/13] scsi: megaraid: Make use of dev_64bit_mmio_supported()

[Nicolas Saenz Julienne <nsaenzjulienne@suse.de>]

Instead of relying on defines use dev_64bit_mmio_supported(), which
provides the same functionality. On top of that convert the
implementation to lo_hi_writeq(), for a cleaner end result.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 23 ++++++++++-----------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 38fc9467c625..d4933a591330 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -36,6 +36,7 @@
 #include <linux/vmalloc.h>
 #include <linux/workqueue.h>
 #include <linux/irq_poll.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -259,19 +260,17 @@ static void
 megasas_write_64bit_req_desc(struct megasas_instance *instance,
 		union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc)
 {
-#if defined(writeq) && defined(CONFIG_64BIT)
-	u64 req_data = (((u64)le32_to_cpu(req_desc->u.high) << 32) |
-		le32_to_cpu(req_desc->u.low));
-	writeq(req_data, &instance->reg_set->inbound_low_queue_port);
-#else
+	u64 req_data = ((u64)le32_to_cpu(req_desc->u.high) << 32) |
+		       le32_to_cpu(req_desc->u.low);
 	unsigned long flags;
-	spin_lock_irqsave(&instance->hba_lock, flags);
-	writel(le32_to_cpu(req_desc->u.low),
-		&instance->reg_set->inbound_low_queue_port);
-	writel(le32_to_cpu(req_desc->u.high),
-		&instance->reg_set->inbound_high_queue_port);
-	spin_unlock_irqrestore(&instance->hba_lock, flags);
-#endif
+
+	if (dev_64bit_mmio_supported(&instance->pdev->dev)) {
+		writeq(req_data, &instance->reg_set->inbound_low_queue_port);
+	} else {
+		spin_lock_irqsave(&instance->hba_lock, flags);
+		lo_hi_writeq(req_data, &instance->reg_set->inbound_low_queue_port);
+		spin_unlock_irqrestore(&instance->hba_lock, flags);
+	}
 }
 
 /**
-- 
2.30.1