From patchwork Wed Jun 10 09:26:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lokesh Vutla X-Patchwork-Id: 6578281 Return-Path: X-Original-To: patchwork-linux-omap@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 1847AC0020 for ; Wed, 10 Jun 2015 09:29:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 36AC5203E6 for ; Wed, 10 Jun 2015 09:29:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 394CA205C6 for ; Wed, 10 Jun 2015 09:29:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754176AbbFJJ3e (ORCPT ); Wed, 10 Jun 2015 05:29:34 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:54403 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754057AbbFJJ3b (ORCPT ); Wed, 10 Jun 2015 05:29:31 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id t5A9T0UB001545; Wed, 10 Jun 2015 04:29:00 -0500 Received: from DFLE73.ent.ti.com (dfle73.ent.ti.com [128.247.5.110]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id t5A9T07C022775; Wed, 10 Jun 2015 04:29:00 -0500 Received: from dflp32.itg.ti.com (10.64.6.15) by DFLE73.ent.ti.com (128.247.5.110) with Microsoft SMTP Server id 14.3.224.2; Wed, 10 Jun 2015 04:28:59 -0500 Received: from a0131933.apr.dhcp.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp32.itg.ti.com (8.14.3/8.13.8) with ESMTP id t5A9SsPC025025; Wed, 10 Jun 2015 04:28:57 -0500 From: Lokesh Vutla To: , CC: , , , , Subject: [PATCH 1/3] ARM: OMAP2+: hwmod: add support for lock and unlock hooks Date: Wed, 10 Jun 2015 14:56:24 +0530 Message-ID: <1433928386-24891-2-git-send-email-lokeshvutla@ti.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1433928386-24891-1-git-send-email-lokeshvutla@ti.com> References: <1433928386-24891-1-git-send-email-lokeshvutla@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Some IP blocks like RTC, needs an additional setting for writing to its registers. This is to prevent any spurious writes from changing the register values. This patch adds optional lock and unlock function pointers to the IP block's hwmod data. These unlock and lock function pointers are called by hwmod code before and after writing sysconfig registers. Signed-off-by: Lokesh Vutla --- arch/arm/mach-omap2/omap_hwmod.c | 13 +++++++++++++ arch/arm/mach-omap2/omap_hwmod.h | 4 ++++ 2 files changed, 17 insertions(+) diff --git a/arch/arm/mach-omap2/omap_hwmod.c b/arch/arm/mach-omap2/omap_hwmod.c index 752969f..44c916d3 100644 --- a/arch/arm/mach-omap2/omap_hwmod.c +++ b/arch/arm/mach-omap2/omap_hwmod.c @@ -299,7 +299,20 @@ static void _write_sysconfig(u32 v, struct omap_hwmod *oh) /* Module might have lost context, always update cache and register */ oh->_sysc_cache = v; + + /* + * Some IP blocks (such as RTC) require unlocking of IP before + * accessing its registers. If a function pointer is present + * to unlock, then call it before accessing sysconfig and + * call lock after writing sysconfig. + */ + if (oh->class->unlock) + oh->class->unlock(oh); + omap_hwmod_write(v, oh, oh->class->sysc->sysc_offs); + + if (oh->class->lock) + oh->class->lock(oh); } /** diff --git a/arch/arm/mach-omap2/omap_hwmod.h b/arch/arm/mach-omap2/omap_hwmod.h index 9611c91..44c7db9 100644 --- a/arch/arm/mach-omap2/omap_hwmod.h +++ b/arch/arm/mach-omap2/omap_hwmod.h @@ -570,6 +570,8 @@ struct omap_hwmod_omap4_prcm { * @pre_shutdown: ptr to fn to be executed immediately prior to device shutdown * @reset: ptr to fn to be executed in place of the standard hwmod reset fn * @enable_preprogram: ptr to fn to be executed during device enable + * @lock: ptr to fn to be executed to lock IP registers + * @unlock: ptr to fn to be executed to unlock IP registers * * Represent the class of a OMAP hardware "modules" (e.g. timer, * smartreflex, gpio, uart...) @@ -594,6 +596,8 @@ struct omap_hwmod_class { int (*pre_shutdown)(struct omap_hwmod *oh); int (*reset)(struct omap_hwmod *oh); int (*enable_preprogram)(struct omap_hwmod *oh); + void (*lock)(struct omap_hwmod *oh); + void (*unlock)(struct omap_hwmod *oh); }; /**