Messages in this thread Patch in this message | | | From | Chris Bostic <> | Subject | [PATCH 12/16] drivers/fsi: Set up links for slave communication | Date | Tue, 6 Dec 2016 20:09:34 -0600 |
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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
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