summaryrefslogtreecommitdiff
path: root/arch/arm/mach-bcm/kona.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-bcm/kona.c')
-rw-r--r--arch/arm/mach-bcm/kona.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/arch/arm/mach-bcm/kona.c b/arch/arm/mach-bcm/kona.c
new file mode 100644
index 000000000000..6939d9017f63
--- /dev/null
+++ b/arch/arm/mach-bcm/kona.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2013 Broadcom Corporation
+ *
+ * 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.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/of_address.h>
+#include <asm/io.h>
+
+#include "kona.h"
+
+static void __iomem *watchdog_base;
+
+void bcm_kona_setup_restart(void)
+{
+ struct device_node *np_wdog;
+
+ /*
+ * The assumption is that whoever calls bcm_kona_setup_restart()
+ * also needs a Kona Watchdog Timer entry in Device Tree, i.e. we
+ * report an error if the DT entry is missing.
+ */
+ np_wdog = of_find_compatible_node(NULL, NULL, "brcm,kona-wdt");
+ if (!np_wdog) {
+ pr_err("brcm,kona-wdt not found in DT, reboot disabled\n");
+ return;
+ }
+ watchdog_base = of_iomap(np_wdog, 0);
+ WARN(!watchdog_base, "failed to map watchdog base");
+ of_node_put(np_wdog);
+}
+
+#define SECWDOG_OFFSET 0x00000000
+#define SECWDOG_RESERVED_MASK 0xE2000000
+#define SECWDOG_WD_LOAD_FLAG_MASK 0x10000000
+#define SECWDOG_EN_MASK 0x08000000
+#define SECWDOG_SRSTEN_MASK 0x04000000
+#define SECWDOG_CLKS_SHIFT 20
+#define SECWDOG_LOCK_SHIFT 0
+
+void bcm_kona_restart(enum reboot_mode mode, const char *cmd)
+{
+ uint32_t val;
+
+ if (!watchdog_base)
+ panic("Watchdog not mapped. Reboot failed.\n");
+
+ /* Enable watchdog2 with very short timeout. */
+ val = readl(watchdog_base + SECWDOG_OFFSET);
+ val &= SECWDOG_RESERVED_MASK | SECWDOG_WD_LOAD_FLAG_MASK;
+ val |= SECWDOG_EN_MASK | SECWDOG_SRSTEN_MASK |
+ (0x8 << SECWDOG_CLKS_SHIFT) |
+ (0x8 << SECWDOG_LOCK_SHIFT);
+ writel(val, watchdog_base + SECWDOG_OFFSET);
+
+ while (1)
+ ;
+}