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drivers/fsi: Set up links for slave communication 

Enable each link and send a break command, and try to detect a slave by
reading from the SMODE register.

Signed-off-by: Christopher Bostic <cbostic@linux.vnet.ibm.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Christopher Bostic 2017-06-06 16:08:41 -05:00 committed by Greg Kroah-Hartman
parent 014c2abc53
commit 2609528211
1 changed files with 35 additions and 2 deletions
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37
drivers/fsi/fsi-core.c
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@ -133,12 +133,45 @@ static int fsi_master_write(struct fsi_master *master, int link,
return master->write(master, link, slave_id, addr, val, size);
}
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;
int link, 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: %d\n", link, rc);
continue;
}
rc = fsi_master_break(master, link);
if (rc) {
dev_dbg(&master->dev,
"break to link %d failed: %d\n", link, rc);
continue;
}
for (link = 0; link < master->n_links; link++)
fsi_slave_init(master, link, 0);
}
return 0;
}