From: Chris Bostic <christopher.lee.bostic@gmail.com>
To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk,
gregkh@linuxfoundation.org, sre@kernel.org,
mturquette@baylibre.com, geert+renesas@glider.be,
devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Cc: Chris Bostic <cbostic@us.ibm.com>,
joel@jms.id.au, jk@ozlabs.org, linux-kernel@vger.kernel.org,
andrew@aj.id.au, alistair@popple.id.au, benh@kernel.crashing.org
Subject: [PATCH 12/16] drivers/fsi: Set up links for slave communication
Date: Tue, 6 Dec 2016 20:09:34 -0600 [thread overview]
Message-ID: <1481076574-54711-5-git-send-email-christopher.lee.bostic@gmail.com> (raw)
In-Reply-To: <1481076574-54711-1-git-send-email-christopher.lee.bostic@gmail.com>
From: Chris Bostic <cbostic@us.ibm.com>
Enable each link and send a break command in preparation
for scanning each link for slaves.
Signed-off-by: Chris Bostic <cbostic@us.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
next prev parent reply other threads:[~2016-12-07 2:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-07 2:09 [PATCH 04/16] drivers/fsi: Add fsi master definition Chris Bostic
2016-12-07 2:09 ` [PATCH 08/16] drivers/fsi: Add crc4 helpers Chris Bostic
2016-12-07 9:02 ` Greg KH
2016-12-07 23:33 ` Jeremy Kerr
2016-12-08 19:43 ` Christopher Bostic
2016-12-07 2:09 ` [PATCH 09/16] drivers/fsi: Implement slave initialisation Chris Bostic
2016-12-07 2:09 ` [PATCH 11/16] drivers/fsi: Add device read/write/peek functions Chris Bostic
2016-12-07 9:29 ` Greg KH
2016-12-07 2:09 ` Chris Bostic [this message]
2016-12-07 9:06 ` [PATCH 04/16] drivers/fsi: Add fsi master definition Greg KH
2016-12-08 22:49 ` Christopher Bostic
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