1 files changed, 91 insertions, 0 deletions
diff --git a/arch/mips/lantiq/xway/reset.c b/arch/mips/lantiq/xway/reset.c
new file mode 100644
index 000000000000..a1be36d0e490
--- /dev/null
+++ b/arch/mips/lantiq/xway/reset.c
@@ -0,0 +1,91 @@
+/*
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ *
+ *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/pm.h>
+#include <linux/module.h>
+#include <asm/reboot.h>
+
+#include <lantiq_soc.h>
+
+#define ltq_rcu_w32(x, y)	ltq_w32((x), ltq_rcu_membase + (y))
+#define ltq_rcu_r32(x)		ltq_r32(ltq_rcu_membase + (x))
+
+/* register definitions */
+#define LTQ_RCU_RST		0x0010
+#define LTQ_RCU_RST_ALL		0x40000000
+
+#define LTQ_RCU_RST_STAT	0x0014
+#define LTQ_RCU_STAT_SHIFT	26
+
+static struct resource ltq_rcu_resource = {
+	.name   = "rcu",
+	.start  = LTQ_RCU_BASE_ADDR,
+	.end    = LTQ_RCU_BASE_ADDR + LTQ_RCU_SIZE - 1,
+	.flags  = IORESOURCE_MEM,
+};
+
+/* remapped base addr of the reset control unit */
+static void __iomem *ltq_rcu_membase;
+
+/* This function is used by the watchdog driver */
+int ltq_reset_cause(void)
+{
+	u32 val = ltq_rcu_r32(LTQ_RCU_RST_STAT);
+	return val >> LTQ_RCU_STAT_SHIFT;
+}
+EXPORT_SYMBOL_GPL(ltq_reset_cause);
+
+static void ltq_machine_restart(char *command)
+{
+	pr_notice("System restart\n");
+	local_irq_disable();
+	ltq_rcu_w32(ltq_rcu_r32(LTQ_RCU_RST) | LTQ_RCU_RST_ALL, LTQ_RCU_RST);
+	unreachable();
+}
+
+static void ltq_machine_halt(void)
+{
+	pr_notice("System halted.\n");
+	local_irq_disable();
+	unreachable();
+}
+
+static void ltq_machine_power_off(void)
+{
+	pr_notice("Please turn off the power now.\n");
+	local_irq_disable();
+	unreachable();
+}
+
+static int __init mips_reboot_setup(void)
+{
+	/* insert and request the memory region */
+	if (insert_resource(&iomem_resource, &ltq_rcu_resource) < 0)
+		panic("Failed to insert rcu memory\n");
+
+	if (request_mem_region(ltq_rcu_resource.start,
+			resource_size(&ltq_rcu_resource), "rcu") < 0)
+		panic("Failed to request rcu memory\n");
+
+	/* remap rcu register range */
+	ltq_rcu_membase = ioremap_nocache(ltq_rcu_resource.start,
+				resource_size(&ltq_rcu_resource));
+	if (!ltq_rcu_membase)
+		panic("Failed to remap rcu memory\n");
+
+	_machine_restart = ltq_machine_restart;
+	_machine_halt = ltq_machine_halt;
+	pm_power_off = ltq_machine_power_off;
+
+	return 0;
+}
+
+arch_initcall(mips_reboot_setup);