[ARM] 5130/4: Support for the at91sam9g20

Support for the at91sam9g20 : Atmel 400Mhz ARM 926ej-s SOC.

AT91sam9g20 is an evolution of the at91sam9260 with a faster clock
speed.
We created a new board for this device but based the chip support
directly on 9260 files with little updates.
Here is the chip page on Atmel wabsite:
http://atmel.com/dyn/products/product_card.asp?part_id=4337

Signed-off-by: Sedji Gaouaou <sedji.gaouaou@atmel.com>
Signed-off-by: Justin Waters <justin.waters@timesys.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-at91/at91sam9260.c

@@ -47,6 +47,20 @@ static struct map_desc at91sam9260_sram_desc[] __initdata = {
 	}
 };
 
+static struct map_desc at91sam9g20_sram_desc[] __initdata = {
+	{
+		.virtual	= AT91_IO_VIRT_BASE - AT91SAM9G20_SRAM0_SIZE,
+		.pfn		= __phys_to_pfn(AT91SAM9G20_SRAM0_BASE),
+		.length		= AT91SAM9G20_SRAM0_SIZE,
+		.type		= MT_DEVICE,
+	}, {
+		.virtual	= AT91_IO_VIRT_BASE - AT91SAM9G20_SRAM0_SIZE - AT91SAM9G20_SRAM1_SIZE,
+		.pfn		= __phys_to_pfn(AT91SAM9G20_SRAM1_BASE),
+		.length		= AT91SAM9G20_SRAM1_SIZE,
+		.type		= MT_DEVICE,
+	}
+};
+
 static struct map_desc at91sam9xe_sram_desc[] __initdata = {
 	{
 		.pfn		= __phys_to_pfn(AT91SAM9XE_SRAM_BASE),
@@ -307,6 +321,8 @@ void __init at91sam9260_initialize(unsigned long main_clock)
 
 	if (cpu_is_at91sam9xe())
 		at91sam9xe_initialize();
+	else if (cpu_is_at91sam9g20())
+		iotable_init(at91sam9g20_sram_desc, ARRAY_SIZE(at91sam9g20_sram_desc));
 	else
 		iotable_init(at91sam9260_sram_desc, ARRAY_SIZE(at91sam9260_sram_desc));