From patchwork Wed Apr 5 02:05:50 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christopher Bostic X-Patchwork-Id: 9663405 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C8B9260353 for ; Wed, 5 Apr 2017 09:08:27 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id AB4D123B24 for ; Wed, 5 Apr 2017 09:08:27 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 9FF8D2859E; Wed, 5 Apr 2017 09:08:27 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 4A35B23B24 for ; Wed, 5 Apr 2017 09:08:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id: References:In-Reply-To:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=qBsbIH8XBnS3s8LoVNIl7Vsq0iW8gpR/SkU6S0VMb1k=; b=GgtpHDvOtbJX4tq58NQ2Lpnziv 6JjO/1lu8BITLBZZlTg7uTxGG7grnHs5Ep5/XA88tj2A/elg2viQO68cqSEQwUgJxnbCWRAWJpDBz jKF11mqHK9hhGbErYVkohOddrk2Sh/kFm2EYVIe7Q8p+uCjUNg8SnwO2EjkhjmMe0bW3wHMebmeq4 Qk6fnYihrFXy3krxcIH0IpqgZfnaEvZPkYnNW39xeeVBV+5YvC43K/un/2BVOU23OyTIiTWz5CcWo rr5d5lgm/mPS9B04KQuri7TMHPdmc7TRdLpZ9OJA+lOwOaEwn8bNuiBdfcR4ARB6VsttEFLzo0M1K 1PAXfX2g==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1cvgvR-0006It-Rz; Wed, 05 Apr 2017 09:08:26 +0000 Received: from casper.infradead.org ([2001:770:15f::2]) by bombadil.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cvb1G-00058D-89 for linux-arm-kernel@bombadil.infradead.org; Wed, 05 Apr 2017 02:50:08 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Message-Id:References:In-Reply-To:Date: Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=5+UeVEFXnJ/te9NgdqMZOT9sbwOIouCvJNvkqW5E628=; b=R1fczwA5L94QJ7dzel3niCWDa GVZVTFPQGZZOCO/rmy4NhDVW+aRVhjFWFv+vnVAulU04EzCDwPnPyNBXBH/3Ed0bLfG0b5lzskAWH mr3mrAWKFnwaNmdNOD4W76jLCmaX22BWoD4gw0YMiDONO05e7syYz/+xItR7hYI1OZp7t9hl8hQ90 hZ9J5u3T61uLWL49334Wbeptyyu92/vpn+4YC7fANI983vOzhPLL2CxVvzs/qJmVus8yIAU/ZzG+U qEV8Urg335qoFLiKTKC3nB3ooZwOx6R1Ilp+6CGOvZizg8LfS+BUMmuUluNfmqOsUsf99vyzGUtcs qz3intOyA==; Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5] helo=mx0a-001b2d01.pphosted.com) by casper.infradead.org with esmtps (Exim 4.87 #1 (Red Hat Linux)) id 1cvaMU-00073Y-5F for linux-arm-kernel@lists.infradead.org; Wed, 05 Apr 2017 02:07:56 +0000 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v3523huN026580 for ; Tue, 4 Apr 2017 22:07:32 -0400 Received: from e12.ny.us.ibm.com (e12.ny.us.ibm.com [129.33.205.202]) by mx0b-001b2d01.pphosted.com with ESMTP id 29ktf865m9-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 04 Apr 2017 22:07:32 -0400 Received: from localhost by e12.ny.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 4 Apr 2017 22:07:31 -0400 Received: from b01cxnp23033.gho.pok.ibm.com (9.57.198.28) by e12.ny.us.ibm.com (146.89.104.199) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Tue, 4 Apr 2017 22:07:27 -0400 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v3527UvB44105816; Wed, 5 Apr 2017 02:07:30 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0171F112034; Tue, 4 Apr 2017 22:07:28 -0400 (EDT) Received: from Christophers-MacBook-Pro.local.com (unknown [9.81.217.91]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP id 60970112051; Tue, 4 Apr 2017 22:07:19 -0400 (EDT) From: Christopher Bostic To: robh+dt@kernel.org, mark.rutland@arm.com, linux@armlinux.org.uk, rostedt@goodmis.org, mingo@redhat.com, gregkh@linuxfoundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH v5 06/23] drivers/fsi: Set up links for slave communication Date: Tue, 4 Apr 2017 21:05:50 -0500 X-Mailer: git-send-email 2.10.1 (Apple Git-78) In-Reply-To: <20170405020607.79939-1-cbostic@linux.vnet.ibm.com> References: <20170405020607.79939-1-cbostic@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 17040502-0048-0000-0000-0000014BF405 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00006884; HX=3.00000240; KW=3.00000007; PH=3.00000004; SC=3.00000208; SDB=6.00843219; UDB=6.00415442; IPR=6.00621395; BA=6.00005266; NDR=6.00000001; ZLA=6.00000005; ZF=6.00000009; ZB=6.00000000; ZP=6.00000000; ZH=6.00000000; ZU=6.00000002; MB=3.00014914; XFM=3.00000013; UTC=2017-04-05 02:07:31 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17040502-0049-0000-0000-0000403CBDDB Message-Id: <20170405020607.79939-7-cbostic@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-04-05_01:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704050017 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20170405_030754_399308_66AB47E4 X-CRM114-Status: GOOD ( 13.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: andrew@aj.id.au, alistair@popple.id.au, linux-kernel@vger.kernel.org, Chris Bostic , benh@kernel.crashing.org, joel@jms.id.au MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP From: Chris Bostic Enable each link and send a break command, and try to detect a slave by reading from the SMODE register. Signed-off-by: Chris Bostic Signed-off-by: Joel Stanley --- drivers/fsi/fsi-core.c | 37 +++++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c index 32698ed..6e1cfdf 100644 --- a/drivers/fsi/fsi-core.c +++ b/drivers/fsi/fsi-core.c @@ -157,12 +157,45 @@ 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; }