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Diffstat (limited to 'arch/arm/cpu/arm920t/ep93xx/cpu.c')
-rw-r--r--arch/arm/cpu/arm920t/ep93xx/cpu.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm920t/ep93xx/cpu.c b/arch/arm/cpu/arm920t/ep93xx/cpu.c
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+++ b/arch/arm/cpu/arm920t/ep93xx/cpu.c
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+/*
+ * Cirrus Logic EP93xx CPU-specific support.
+ *
+ * Copyright (C) 2009 Matthias Kaehlcke <matthias@kaehlcke.net>
+ *
+ * Copyright (C) 2004, 2005
+ * Cory T. Tusar, Videon Central, Inc., <ctusar@videon-central.com>
+ *
+ * See file CREDITS for list of people who contributed to this project.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <common.h>
+#include <asm/arch/ep93xx.h>
+#include <asm/io.h>
+
+/* We reset the CPU by generating a 1-->0 transition on DeviceCfg bit 31. */
+extern void reset_cpu(ulong addr)
+{
+ struct syscon_regs *syscon = (struct syscon_regs *)SYSCON_BASE;
+ uint32_t value;
+
+ /* Unlock DeviceCfg and set SWRST */
+ writel(0xAA, &syscon->sysswlock);
+ value = readl(&syscon->devicecfg);
+ value |= SYSCON_DEVICECFG_SWRST;
+ writel(value, &syscon->devicecfg);
+
+ /* Unlock DeviceCfg and clear SWRST */
+ writel(0xAA, &syscon->sysswlock);
+ value = readl(&syscon->devicecfg);
+ value &= ~SYSCON_DEVICECFG_SWRST;
+ writel(value, &syscon->devicecfg);
+
+ /* Dying... */
+ while (1)
+ ; /* noop */
+}