From patchwork Sun Jul 6 18:43:10 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Heiko_St=C3=BCbner?= X-Patchwork-Id: 4491131 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B48CFBEEAA for ; Sun, 6 Jul 2014 18:41:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A676720253 for ; Sun, 6 Jul 2014 18:41:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9C51B2024C for ; Sun, 6 Jul 2014 18:41:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752144AbaGFSls (ORCPT ); Sun, 6 Jul 2014 14:41:48 -0400 Received: from gloria.sntech.de ([95.129.55.99]:48183 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752063AbaGFSlr (ORCPT ); Sun, 6 Jul 2014 14:41:47 -0400 Received: from ip9234425c.dynamic.kabel-deutschland.de ([146.52.66.92] helo=diego.localnet) by gloria.sntech.de with esmtpsa (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.80) (envelope-from ) id 1X3rNg-0004Qx-3N; Sun, 06 Jul 2014 20:41:44 +0200 From: Heiko =?ISO-8859-1?Q?St=FCbner?= To: Guenter Roeck Cc: linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Wim Van Sebroeck , linux-samsung-soc@vger.kernel.org, Tomasz Figa , Mike Turquette Subject: [RFC PATCH 2/3] clk: samsung: register restart notifiers for s3c2412 and s3c2443 Date: Sun, 06 Jul 2014 20:43:10 +0200 Message-ID: <1436436.XH2jFxzQOf@diego> User-Agent: KMail/4.11.5 (Linux/3.13-1-amd64; KDE/4.11.3; x86_64; ; ) In-Reply-To: <1531376.ijR0PPyvmJ@diego> References: <1531376.ijR0PPyvmJ@diego> MIME-Version: 1.0 Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham 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 S3C2412, S3C2443 and their derivatives contain a special software-reset register in their system-controller. Therefore register a restart-notifier for those. Tested on a s3c2416-based board, s3c2412 compile-tested. Signed-off-by: Heiko Stuebner --- drivers/clk/samsung/clk-s3c2412.c | 28 ++++++++++++++++++++++++++++ drivers/clk/samsung/clk-s3c2443.c | 18 ++++++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/drivers/clk/samsung/clk-s3c2412.c b/drivers/clk/samsung/clk-s3c2412.c index 23e4313..840f9bd 100644 --- a/drivers/clk/samsung/clk-s3c2412.c +++ b/drivers/clk/samsung/clk-s3c2412.c @@ -14,6 +14,7 @@ #include #include #include +#include #include @@ -26,6 +27,7 @@ #define CLKCON 0x0c #define CLKDIVN 0x14 #define CLKSRC 0x1c +#define SWRST 0x30 /* list of PLLs to be registered */ enum s3c2412_plls { @@ -204,6 +206,27 @@ struct samsung_clock_alias s3c2412_aliases[] __initdata = { ALIAS(MSYSCLK, NULL, "fclk"), }; +static int s3c2412_restart_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + /* errata "Watch-dog/Software Reset Problem" specifies that + * this reset must be done with the SYSCLK sourced from + * EXTCLK instead of FOUT to avoid a glitch in the reset + * mechanism. + * + * See the watchdog section of the S3C2412 manual for more + * information on this fix. + */ + + __raw_writel(0x00, reg_base + CLKSRC); + __raw_writel(0x533C2412, reg_base + SWRST); + return NOTIFY_DONE; +} + +static struct notifier_block s3c2412_restart_notifier = { + .notifier_call = s3c2412_restart_notify, +}; + /* * fixed rate clocks generated outside the soc * Only necessary until the devicetree-move is complete @@ -233,6 +256,7 @@ void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f, unsigned long ext_f, void __iomem *base) { struct samsung_clk_provider *ctx; + int ret; reg_base = base; if (np) { @@ -265,6 +289,10 @@ void __init s3c2412_common_clk_init(struct device_node *np, unsigned long xti_f, ARRAY_SIZE(s3c2412_aliases)); s3c2412_clk_sleep_init(); + + ret = register_restart_notifier(&s3c2412_restart_notifier); + if (ret) + pr_warn("cannot register restart notifier, %d\n", ret); } static void __init s3c2412_clk_init(struct device_node *np) diff --git a/drivers/clk/samsung/clk-s3c2443.c b/drivers/clk/samsung/clk-s3c2443.c index c4bbdab..0be33cc 100644 --- a/drivers/clk/samsung/clk-s3c2443.c +++ b/drivers/clk/samsung/clk-s3c2443.c @@ -14,6 +14,7 @@ #include #include #include +#include #include @@ -33,6 +34,7 @@ #define HCLKCON 0x30 #define PCLKCON 0x34 #define SCLKCON 0x38 +#define SWRST 0x44 /* the soc types */ enum supported_socs { @@ -354,6 +356,17 @@ struct samsung_clock_alias s3c2450_aliases[] __initdata = { ALIAS(PCLK_I2C1, "s3c2410-i2c.1", "i2c"), }; +static int s3c2443_restart_notify(struct notifier_block *this, + unsigned long mode, void *cmd) +{ + __raw_writel(0x533c2443, reg_base + SWRST); + return NOTIFY_DONE; +} + +static struct notifier_block s3c2443_restart_notifier = { + .notifier_call = s3c2443_restart_notify, +}; + /* * fixed rate clocks generated outside the soc * Only necessary until the devicetree-move is complete @@ -378,6 +391,7 @@ void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f, void __iomem *base) { struct samsung_clk_provider *ctx; + int ret; reg_base = base; if (np) { @@ -445,6 +459,10 @@ void __init s3c2443_common_clk_init(struct device_node *np, unsigned long xti_f, } s3c2443_clk_sleep_init(); + + ret = register_restart_notifier(&s3c2443_restart_notifier); + if (ret) + pr_warn("cannot register restart notifier, %d\n", ret); } static void __init s3c2416_clk_init(struct device_node *np)