soc/marvell/mvmap2315: Add WDT driver

Testing: booted successfully.

Change-Id: Ie9c9297f321c838f86e5536aab29f67a0eeb053d
Signed-off-by: Hakim Giydan <hgiydan@marvell.com>
Reviewed-on: https://review.coreboot.org/15519
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/src/soc/marvell/mvmap2315/wdt.c b/src/soc/marvell/mvmap2315/wdt.c
new file mode 100644
index 0000000000..8c643b7f95
--- /dev/null
+++ b/src/soc/marvell/mvmap2315/wdt.c
@@ -0,0 +1,74 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2016 Marvell, Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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 <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <arch/io.h>
+#include <console/console.h>
+#include <soc/wdt.h>
+
+struct mvmap2315_wdt_regs *mvmap2315_wdts[] = {
+	(struct mvmap2315_wdt_regs *)MVMAP2315_WDT0_BASE,
+	(struct mvmap2315_wdt_regs *)MVMAP2315_WDT1_BASE,
+};
+
+void enable_sp_watchdog(u32 timer, u32 timeout_value)
+{
+	u32 reg;
+
+	reg = read32(&mvmap2315_wdts[timer]->wdt_cr);
+
+	/* set watchdog Reset pulse length to the highest value
+	 * (256 Pclk cycles)
+	 */
+	reg |= 7 << MVMAP2315_WDT_CR_RPL_SHIFT;
+
+	/* set the watchdog timer to generate a system reset */
+	reg &= ~MVMAP2315_WDT_CR_RMOD;
+
+	write32(&mvmap2315_wdts[timer]->wdt_cr, reg);
+
+	/* enable the watchdog timer */
+	setbits_le32(&mvmap2315_wdts[timer]->wdt_cr, MVMAP2315_WDT_CR_EN);
+
+	/* set watchdog Timeout Range Register */
+	reg = timeout_value << MVMAP2315_WDT_TORR_TOP_SHIFT;
+	write32(&mvmap2315_wdts[timer]->wdt_torr, reg);
+
+	/* reset the timer */
+	reg = 0x76 << MVMAP2315_WDT_CRR_SHIFT;
+	write32(&mvmap2315_wdts[timer]->wdt_crr, reg);
+}
+
+void reset_sp_watchdog(u32 timer, u32 timeout_value)
+{
+	u32 reg;
+
+	/* set watchdog Timeout Range Register */
+	reg = timeout_value << MVMAP2315_WDT_TORR_TOP_SHIFT;
+	write32(&mvmap2315_wdts[timer]->wdt_torr, reg);
+
+	if (read32(&mvmap2315_wdts[timer]->wdt_cr) & MVMAP2315_WDT_CR_EN) {
+		/* reset the timer */
+		reg = 0x76 << MVMAP2315_WDT_CRR_SHIFT;
+		write32(&mvmap2315_wdts[timer]->wdt_crr, reg);
+	} else {
+		/* enable the watchdog timer */
+		setbits_le32(&mvmap2315_wdts[timer]->wdt_cr,
+			     MVMAP2315_WDT_CR_EN);
+	}
+}