From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751052AbdALWeN (ORCPT ); Thu, 12 Jan 2017 17:34:13 -0500 Received: from mail-pf0-f196.google.com ([209.85.192.196]:33080 "EHLO mail-pf0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750772AbdALWdp (ORCPT ); Thu, 12 Jan 2017 17:33:45 -0500 From: christopher.lee.bostic@gmail.com To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, gregkh@linuxfoundation.org, mturquette@baylibre.com, geert+renesas@glider.be, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, joel@jms.id.au, jk@ozlabs.org, linux-kernel@vger.kernel.org, andrew@aj.id.au, alistair@popple.id.au, benh@kernel.crashing.org Cc: Chris Bostic Subject: [PATCH v2 11/18] drivers/fsi: Set up links for slave communication Date: Thu, 12 Jan 2017 16:32:23 -0600 Message-Id: <1484260343-80012-1-git-send-email-christopher.lee.bostic@gmail.com> X-Mailer: git-send-email 2.7.4 (Apple Git-66) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chris Bostic Enable each link and send a break command in preparation for scanning each link for slaves. Signed-off-by: Chris Bostic Signed-off-by: Jeremy Kerr --- drivers/fsi/fsi-core.c | 38 ++++++++++++++++++++++++++++++++++++-- drivers/fsi/fsi-master.h | 2 ++ 2 files changed, 38 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 3119aa1..b2c9274 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -271,14 +271,48 @@ 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; } diff --git a/drivers/fsi/fsi-master.h b/drivers/fsi/fsi-master.h index e75a810..94a0671 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