linux-kernel - [PATCH 12/16] drivers/fsi: Set up links for slave communication

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Message-Id: <1481076574-54711-5-git-send-email-christopher.lee.bostic@gmail.com>
Date:   Tue,  6 Dec 2016 20:09:34 -0600
From:   Chris Bostic <christopher.lee.bostic@...il.com>
To:     robh+dt@...nel.org, mark.rutland@....com, linux@...linux.org.uk,
        gregkh@...uxfoundation.org, sre@...nel.org,
        mturquette@...libre.com, geert+renesas@...der.be,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Chris Bostic <cbostic@...ibm.com>, joel@....id.au, jk@...abs.org,
        linux-kernel@...r.kernel.org, andrew@...id.au,
        alistair@...ple.id.au, benh@...nel.crashing.org
Subject: [PATCH 12/16] drivers/fsi: Set up links for slave communication

From: Chris Bostic <cbostic@...ibm.com>

Enable each link and send a break command in preparation
for scanning each link for slaves.

Signed-off-by: Chris Bostic <cbostic@...ibm.com>
---
 drivers/fsi/fsi-core.c   | 39 ++++++++++++++++++++++++++++++++++++---
 drivers/fsi/fsi-master.h |  2 ++
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index 80feeb8..93de0f1 100644
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -290,16 +290,49 @@ static int fsi_slave_init(struct fsi_master *master,
 
 /* FSI master support */
 
+static int fsi_master_link_enable(struct fsi_master *master, int link)
+{
+	if (master->link_enable)
+		return master->link_enable(master, link);
+
+	return 0;
+}
+
+/*
+ * Issue a break command on this link
+ */
+static int fsi_master_break(struct fsi_master *master, int link)
+{
+	if (master->send_break)
+		return master->send_break(master, link);
+
+	return 0;
+}
+
 static int fsi_master_scan(struct fsi_master *master)
 {
-	int link, slave_id;
+	int link, slave_id, rc;
+
+	for (link = 0; link < master->n_links; link++) {
+		rc = fsi_master_link_enable(master, link);
+		if (rc) {
+			dev_dbg(master->dev,
+				"enable link:%d failed with:%d\n", link, rc);
+			continue;
+		}
+		rc = fsi_master_break(master, link);
+		if (rc) {
+			dev_dbg(master->dev,
+				"Break to link:%d failed with:%d\n", link, rc);
+			continue;
+		}
 
-	for (link = 0; link < master->n_links; link++)
 		for (slave_id = 0; slave_id < FSI_N_SLAVES; slave_id++)
 			fsi_slave_init(master, link, slave_id);
 
-	return 0;
+	}
 
+	return 0;
 }
 
 int fsi_master_register(struct fsi_master *master)
diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h
index cafb433..56aad0e 100644
--- a/drivers/fsi/fsi-master.h
+++ b/drivers/fsi/fsi-master.h
@@ -29,6 +29,8 @@ struct fsi_master {
 	int		(*write)(struct fsi_master *, int link,
 				uint8_t slave, uint32_t addr,
 				const void *val, size_t size);
+	int		(*send_break)(struct fsi_master *, int link);
+	int		(*link_enable)(struct fsi_master *, int link);
 };
 
 extern int fsi_master_register(struct fsi_master *master);
-- 
1.8.2.2