1 files changed, 53 insertions, 0 deletions
diff --git a/arch/mips/lantiq/xway/ebu.c b/arch/mips/lantiq/xway/ebu.c
new file mode 100644
index 000000000000..66eb52fa50a1
--- /dev/null
+++ b/arch/mips/lantiq/xway/ebu.c
@@ -0,0 +1,53 @@
+/*
+ *  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.
+ *
+ *  EBU - the external bus unit attaches PCI, NOR and NAND
+ *
+ *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/ioport.h>
+
+#include <lantiq_soc.h>
+
+/* all access to the ebu must be locked */
+DEFINE_SPINLOCK(ebu_lock);
+EXPORT_SYMBOL_GPL(ebu_lock);
+
+static struct resource ltq_ebu_resource = {
+	.name	= "ebu",
+	.start	= LTQ_EBU_BASE_ADDR,
+	.end	= LTQ_EBU_BASE_ADDR + LTQ_EBU_SIZE - 1,
+	.flags	= IORESOURCE_MEM,
+};
+
+/* remapped base addr of the clock unit and external bus unit */
+void __iomem *ltq_ebu_membase;
+
+static int __init lantiq_ebu_init(void)
+{
+	/* insert and request the memory region */
+	if (insert_resource(&iomem_resource, &ltq_ebu_resource) < 0)
+		panic("Failed to insert ebu memory\n");
+
+	if (request_mem_region(ltq_ebu_resource.start,
+			resource_size(&ltq_ebu_resource), "ebu") < 0)
+		panic("Failed to request ebu memory\n");
+
+	/* remap ebu register range */
+	ltq_ebu_membase = ioremap_nocache(ltq_ebu_resource.start,
+				resource_size(&ltq_ebu_resource));
+	if (!ltq_ebu_membase)
+		panic("Failed to remap ebu memory\n");
+
+	/* make sure to unprotect the memory region where flash is located */
+	ltq_ebu_w32(ltq_ebu_r32(LTQ_EBU_BUSCON0) & ~EBU_WRDIS, LTQ_EBU_BUSCON0);
+	return 0;
+}
+
+postcore_initcall(lantiq_ebu_init);