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| author | Christopher Bostic <cbostic@linux.vnet.ibm.com> | 2017-06-06 16:08:41 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-09 11:52:08 +0200 |
| commit | 26095282119ecf1088193d09388fa40700e34e45 (patch) | |
| tree | a32193da64967794395202d9c1f39d9c356659ae /drivers/fsi/fsi-core.c | |
| parent | 014c2abc530d7f3674c195891cef7128352453e0 (diff) | |
| download | lwn-26095282119ecf1088193d09388fa40700e34e45.tar.gz lwn-26095282119ecf1088193d09388fa40700e34e45.zip | |
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>
Diffstat (limited to 'drivers/fsi/fsi-core.c')
| -rw-r--r-- | drivers/fsi/fsi-core.c | 37 |
1 files changed, 35 insertions, 2 deletions
diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 1ec97909e520..235f17a6d89e 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -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; } |