arm: Add Initial TI-Nspire support

This patch adds support for the TI-Nspire platform.

Changes between v1 and v2:
* Added GENERIC_IRQ_CHIP to platform Kconfig

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/include/debug/nspire.S

@@ -0,0 +1,28 @@
+/*
+ *	linux/arch/arm/include/debug/nspire.S
+ *
+ *	Copyright (C) 2013 Daniel Tang <tangrs@tangrs.id.au>
+ *
+ * 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.
+ *
+ */
+
+#define NSPIRE_EARLY_UART_PHYS_BASE	   0x90020000
+#define NSPIRE_EARLY_UART_VIRT_BASE	   0xfee20000
+
+.macro	addruart, rp, rv, tmp
+	ldr \rp, =(NSPIRE_EARLY_UART_PHYS_BASE)		@ physical base address
+	ldr \rv, =(NSPIRE_EARLY_UART_VIRT_BASE)		@ virtual base address
+.endm
+
+
+#ifdef CONFIG_DEBUG_NSPIRE_CX_UART
+#include <asm/hardware/debug-pl01x.S>
+#endif
+
+#ifdef CONFIG_DEBUG_NSPIRE_CLASSIC_UART
+#define UART_SHIFT 2
+#include <asm/hardware/debug-8250.S>
+#endif