From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:6f8:1178:4:290:27ff:fe1d:cc33]) by merlin.infradead.org with esmtps (Exim 4.76 #1 (Red Hat Linux)) id 1SrPuJ-0004G5-6v for barebox@lists.infradead.org; Wed, 18 Jul 2012 08:47:00 +0000 Received: from dude.hi.pengutronix.de ([2001:6f8:1178:2:21e:67ff:fe11:9c5c]) by metis.ext.pengutronix.de with esmtp (Exim 4.72) (envelope-from ) id 1SrPuG-0003IV-BM for barebox@lists.infradead.org; Wed, 18 Jul 2012 10:46:52 +0200 Received: from jbe by dude.hi.pengutronix.de with local (Exim 4.80) (envelope-from ) id 1SrPuG-0004gV-9Y for barebox@lists.infradead.org; Wed, 18 Jul 2012 10:46:52 +0200 From: Juergen Beisert Date: Wed, 18 Jul 2012 10:46:49 +0200 Message-Id: <1342601210-17849-4-git-send-email-jbe@pengutronix.de> In-Reply-To: <1342601210-17849-1-git-send-email-jbe@pengutronix.de> References: <1342601210-17849-1-git-send-email-jbe@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: barebox-bounces@lists.infradead.org Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: [PATCH 3/4] ARM/i.MX: add support to detect the reset source To: barebox@lists.infradead.org Signed-off-by: Juergen Beisert --- arch/arm/mach-imx/Makefile | 1 + arch/arm/mach-imx/reset_source.c | 72 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 73 insertions(+) create mode 100644 arch/arm/mach-imx/reset_source.c diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile index 89a8946..2ff537a 100644 --- a/arch/arm/mach-imx/Makefile +++ b/arch/arm/mach-imx/Makefile @@ -1,4 +1,5 @@ obj-y += clocksource.o gpio.o +obj-$(CONFIG_RESET_SOURCE) += reset_source.o obj-$(CONFIG_ARCH_IMX1) += speed-imx1.o imx1.o iomux-v1.o obj-$(CONFIG_ARCH_IMX25) += speed-imx25.o imx25.o iomux-v3.o obj-$(CONFIG_ARCH_IMX21) += speed-imx21.o imx21.o iomux-v1.o diff --git a/arch/arm/mach-imx/reset_source.c b/arch/arm/mach-imx/reset_source.c new file mode 100644 index 0000000..e7b2a90 --- /dev/null +++ b/arch/arm/mach-imx/reset_source.c @@ -0,0 +1,72 @@ +/* + * (C) Copyright 2012 Juergen Beisert - + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include + +#ifdef CONFIG_ARCH_IMX1 +# define IMX_RESET_SRC_WDOG (1 << 1) +# define IMX_RESET_SRC_HRDRESET (1 << 0) +/* let the compiler sort out useless code on this arch */ +# define IMX_RESET_SRC_WARMSTART 0 +# define IMX_RESET_SRC_COLDSTART 0 +#else + /* WRSR checked for i.MX25, i.MX27, i.MX31, i.MX35 and i.MX51 */ +# define WDOG_WRSR 0x04 + /* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */ +# define IMX_RESET_SRC_WARMSTART (1 << 0) + /* valid for i.MX25, i.MX27, i.MX31, i.MX35, i.MX51 */ +# define IMX_RESET_SRC_WDOG (1 << 1) + /* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */ +# define IMX_RESET_SRC_HRDRESET (1 << 3) + /* valid for i.MX27, i.MX31, always '0' on i.MX25, i.MX35, i.MX51 */ +# define IMX_RESET_SRC_COLDSTART (1 << 4) +#endif + +static unsigned read_detection_register(void) +{ +#ifdef CONFIG_ARCH_IMX1 + return readl(IMX_SYSCTRL_BASE); +#else + return readw(IMX_WDT_BASE + WDOG_WRSR); +#endif +} + +static int imx_detect_reset_source(void) +{ + unsigned reg = read_detection_register(); + + if (reg & IMX_RESET_SRC_COLDSTART) { + set_reset_source(RESET_POR); + return 0; + } + + if (reg & (IMX_RESET_SRC_HRDRESET | IMX_RESET_SRC_WARMSTART)) { + set_reset_source(RESET_RST); + return 0; + } + + if (reg & IMX_RESET_SRC_WDOG) { + set_reset_source(RESET_WDG); + return 0; + } + + /* else keep the default 'unknown' state */ + return 0; +} + +device_initcall(imx_detect_reset_source); -- 1.7.10.4 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox