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From: Juergen Beisert <jbe@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH 1/2] ARM/MXS: add new way to reset the whole SoC
Date: Thu, 21 Jun 2012 11:12:21 +0200	[thread overview]
Message-ID: <1340269942-25253-2-git-send-email-jbe@pengutronix.de> (raw)
In-Reply-To: <1340269942-25253-1-git-send-email-jbe@pengutronix.de>

Currently the watchdog is occupied for system reset. This usage collides with
the dedicated usage of a watchdog. This patch change the behaviour of at least
i.MX23/i.MX28 where the chipset supports a simple and powerful alternative
to reset the whole SoC (including the PMIC).

Signed-off-by: Juergen Beisert <jbe@pengutronix.de>
---
 arch/arm/mach-mxs/soc-imx23.c |   37 +++++++++++++++++++++++++++++++++++++
 arch/arm/mach-mxs/soc-imx28.c |   37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 arch/arm/mach-mxs/soc-imx23.c
 create mode 100644 arch/arm/mach-mxs/soc-imx28.c

diff --git a/arch/arm/mach-mxs/soc-imx23.c b/arch/arm/mach-mxs/soc-imx23.c
new file mode 100644
index 0000000..6819b3c
--- /dev/null
+++ b/arch/arm/mach-mxs/soc-imx23.c
@@ -0,0 +1,37 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * 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.
+ *
+ * Collection of some SoC specific functions
+ */
+
+#include <common.h>
+#include <init.h>
+#include <mach/imx-regs.h>
+#include <io.h>
+
+#define HW_CLKCTRL_RESET 0x120
+# define HW_CLKCTRL_RESET_CHIP (1 << 1)
+
+/* Reset the full i.MX23 SoC via a chipset feature */
+void __noreturn reset_cpu(unsigned long addr)
+{
+	u32 reg;
+
+	reg = readl(IMX_CCM_BASE + HW_CLKCTRL_RESET);
+	writel(reg | HW_CLKCTRL_RESET_CHIP, IMX_CCM_BASE + HW_CLKCTRL_RESET);
+
+	while (1)
+		;
+	/*NOTREACHED*/
+}
+EXPORT_SYMBOL(reset_cpu);
diff --git a/arch/arm/mach-mxs/soc-imx28.c b/arch/arm/mach-mxs/soc-imx28.c
new file mode 100644
index 0000000..a181b75
--- /dev/null
+++ b/arch/arm/mach-mxs/soc-imx28.c
@@ -0,0 +1,37 @@
+/*
+ * (c) 2012 Juergen Beisert <kernel@pengutronix.de>
+ *
+ * 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.
+ *
+ * Collection of some SoC specific functions
+ */
+
+#include <common.h>
+#include <init.h>
+#include <mach/imx-regs.h>
+#include <io.h>
+
+#define HW_CLKCTRL_RESET 0x1e0
+# define HW_CLKCTRL_RESET_CHIP (1 << 1)
+
+/* Reset the full i.MX28 SoC via a chipset feature */
+void __noreturn reset_cpu(unsigned long addr)
+{
+	u32 reg;
+
+	reg = readl(IMX_CCM_BASE + HW_CLKCTRL_RESET);
+	writel(reg | HW_CLKCTRL_RESET_CHIP, IMX_CCM_BASE + HW_CLKCTRL_RESET);
+
+	while (1)
+		;
+	/*NOTREACHED*/
+}
+EXPORT_SYMBOL(reset_cpu);
-- 
1.7.10


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  reply	other threads:[~2012-06-21  9:12 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-06-21  9:12 [PATCHv2] ARM/MXS: free the watchdog from acting as a system reset source on demand Juergen Beisert
2012-06-21  9:12 ` Juergen Beisert [this message]
2012-06-21  9:12 ` [PATCH 2/2] ARM/MXS: remove the now obsolete mxs reset routine Juergen Beisert
2012-06-21 17:30 ` [PATCHv2] ARM/MXS: free the watchdog from acting as a system reset source on demand Sascha Hauer
  -- strict thread matches above, loose matches on Subject: below --
2012-06-20 13:49 [PATCH] " Juergen Beisert
2012-06-20 13:49 ` [PATCH 1/2] ARM/MXS: add new way to reset the whole SoC Juergen Beisert
2012-06-20 18:46   ` Uwe Kleine-König
2012-06-20 19:04     ` Juergen Beisert
2012-06-20 20:05       ` Uwe Kleine-König
2012-06-21  8:33         ` Juergen Beisert

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