1 files changed, 61 insertions, 0 deletions
diff --git a/arch/arm/mach-socfpga/cyclone5-reset-manager.c b/arch/arm/mach-socfpga/cyclone5-reset-manager.c
new file mode 100644
index 0000000000..4bbe1a8101
--- /dev/null
+++ b/arch/arm/mach-socfpga/cyclone5-reset-manager.c
@@ -0,0 +1,61 @@
+/*
+ *  Copyright (C) 2012 Altera Corporation <www.altera.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <common.h>
+#include <io.h>
+#include <init.h>
+#include <restart.h>
+#include <mach/cyclone5-regs.h>
+#include <mach/cyclone5-reset-manager.h>
+
+/* Disable the watchdog (toggle reset to watchdog) */
+void watchdog_disable(void)
+{
+	void __iomem *rm = (void *)CYCLONE5_RSTMGR_ADDRESS;
+	uint32_t val;
+
+	/* assert reset for watchdog */
+	val = readl(rm + RESET_MGR_PER_MOD_RESET_OFS);
+	val |= 1 << RSTMGR_PERMODRST_L4WD0_LSB;
+	writel(val, rm + RESET_MGR_PER_MOD_RESET_OFS);
+
+	/* deassert watchdog from reset (watchdog in not running state) */
+	val = readl(rm + RESET_MGR_PER_MOD_RESET_OFS);
+	val &= ~(1 << RSTMGR_PERMODRST_L4WD0_LSB);
+	writel(val, rm + RESET_MGR_PER_MOD_RESET_OFS);
+}
+
+/* Write the reset manager register to cause reset */
+static void __noreturn socfpga_restart_soc(struct restart_handler *rst)
+{
+	/* request a warm reset */
+	writel((1 << RSTMGR_CTRL_SWWARMRSTREQ_LSB),
+		CYCLONE5_RSTMGR_ADDRESS + RESET_MGR_CTRL_OFS);
+	/*
+	 * infinite loop here as watchdog will trigger and reset
+	 * the processor
+	 */
+	hang();
+}
+
+static int restart_register_feature(void)
+{
+	restart_handler_register_fn(socfpga_restart_soc);
+
+	return 0;
+}
+coredevice_initcall(restart_register_feature);