Subject: [PATCH 1/4] cxlflash: Refactor context reset to share reset logic

From: Uma Krishnan <[email-masked]>
Date: Fri, 6 Jan 2017 08:04:50 -0600

From: "Matthew R. Ochs" <[email-masked]>

As staging for supporting hardware with different context reset
registers but a similar reset procedure, refactor the existing context
reset routine to move the reset logic to a common routine. This will
allow hardware with a different reset register to leverage existing
code.

Signed-off-by: Matthew R. Ochs <[email-masked]>
---
 drivers/scsi/cxlflash/main.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c
index b17ebf6..a990efb 100644
--- a/drivers/scsi/cxlflash/main.c
+++ b/drivers/scsi/cxlflash/main.c
@@ -188,10 +188,11 @@ static void cmd_complete(struct afu_cmd *cmd)
 }
 
 /**
- * context_reset_ioarrin() - reset command owner context via IOARRIN register
+ * context_reset() - reset command owner context via specified register
  * @cmd:	AFU command that timed out.
+ * @reset_reg:	MMIO register to perform reset.
  */
-static void context_reset_ioarrin(struct afu_cmd *cmd)
+static void context_reset(struct afu_cmd *cmd, __be64 __iomem *reset_reg)
 {
 	int nretry = 0;
 	u64 rrin = 0x1;
@@ -201,9 +202,9 @@ static void context_reset_ioarrin(struct afu_cmd *cmd)
 
 	pr_debug("%s: cmd=%p\n", __func__, cmd);
 
-	writeq_be(rrin, &afu->host_map->ioarrin);
+	writeq_be(rrin, reset_reg);
 	do {
-		rrin = readq_be(&afu->host_map->ioarrin);
+		rrin = readq_be(reset_reg);
 		if (rrin != 0x1)
 			break;
 		/* Double delay each time */
@@ -215,6 +216,17 @@ static void context_reset_ioarrin(struct afu_cmd *cmd)
 }
 
 /**
+ * context_reset_ioarrin() - reset command owner context via IOARRIN register
+ * @cmd:	AFU command that timed out.
+ */
+static void context_reset_ioarrin(struct afu_cmd *cmd)
+{
+	struct afu *afu = cmd->parent;
+
+	context_reset(cmd, &afu->host_map->ioarrin);
+}
+
+/**
  * send_cmd_ioarrin() - sends an AFU command via IOARRIN register
  * @afu:	AFU associated with the host.
  * @cmd:	AFU command to send.
-- 
2.1.0