[PATCH 12/16] drivers/fsi: Set up links for slave communication
Chris Bostic
christopher.lee.bostic at gmail.com
Tue Dec 6 18:09:34 PST 2016
From: Chris Bostic <cbostic at 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 at 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
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