[ARM] 4192/1: AT91: Support for AT91SAM9XE processors.

Add support for the Atmel AT91SAM9XE range of processors.  These are
basically AT91SAM9260's with different amounts of internal SRAM and
Flash.

We make use of the existing AT91SAM9260 support, but just perform
run-time detection of the size of the internal SRAM.

Original patch from Nicolas Ferre.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 53 insertions, 6 deletions

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 9313888d77c..bf0d96272e3 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -9,7 +9,7 @@ config ARCH_AT91RM9200
 	bool "AT91RM9200"
 
 config ARCH_AT91SAM9260
-	bool "AT91SAM9260"
+	bool "AT91SAM9260 or AT91SAM9XE"
 
 config ARCH_AT91SAM9261
 	bool "AT91SAM9261"
@@ -93,13 +93,22 @@ endif
 
 if ARCH_AT91SAM9260
 
-comment "AT91SAM9260 Board Type"
+comment "AT91SAM9260 Variants"
+
+config ARCH_AT91SAM9260_SAM9XE
+	bool "AT91SAM9XE"
+	depends on ARCH_AT91SAM9260
+	help
+	  Select this if you are using Atmel's AT91SAM9XE System-on-Chip.
+	  They are basicaly AT91SAM9260s with various sizes of embedded Flash.
+
+comment "AT91SAM9260 / AT91SAM9XE Board Type"
 
 config MACH_AT91SAM9260EK
-	bool "Atmel AT91SAM9260-EK Evaluation Kit"
+	bool "Atmel AT91SAM9260-EK / AT91SAM9XE Evaluation Kit"
 	depends on ARCH_AT91SAM9260
 	help
-	  Select this if you are using Atmel's AT91SAM9260-EK Evaluation Kit.
+	  Select this if you are using Atmel's AT91SAM9260-EK or AT91SAM9XE Evaluation Kit
 	  <http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3933>
 
 endif
diff --git a/arch/arm/mach-at91/at91sam9260.c b/arch/arm/mach-at91/at91sam9260.c
index 86e3a4c4655..003c27c2ef6 100644
--- a/arch/arm/mach-at91/at91sam9260.c
+++ b/arch/arm/mach-at91/at91sam9260.c
@@ -14,6 +14,7 @@
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
+#include <asm/arch/cpu.h>
 #include <asm/arch/at91sam9260.h>
 #include <asm/arch/at91_pmc.h>
 #include <asm/arch/at91_rstc.h>
@@ -27,7 +28,11 @@ static struct map_desc at91sam9260_io_desc[] __initdata = {
 		.pfn		= __phys_to_pfn(AT91_BASE_SYS),
 		.length		= SZ_16K,
 		.type		= MT_DEVICE,
-	}, {
+	}
+};
+
+static struct map_desc at91sam9260_sram_desc[] __initdata = {
+	{
 		.virtual	= AT91_IO_VIRT_BASE - AT91SAM9260_SRAM0_SIZE,
 		.pfn		= __phys_to_pfn(AT91SAM9260_SRAM0_BASE),
 		.length		= AT91SAM9260_SRAM0_SIZE,
@@ -37,7 +42,14 @@ static struct map_desc at91sam9260_io_desc[] __initdata = {
 		.pfn		= __phys_to_pfn(AT91SAM9260_SRAM1_BASE),
 		.length		= AT91SAM9260_SRAM1_SIZE,
 		.type		= MT_DEVICE,
-	},
+	}
+};
+
+static struct map_desc at91sam9xe_sram_desc[] __initdata = {
+	{
+		.pfn		= __phys_to_pfn(AT91SAM9XE_SRAM_BASE),
+		.type		= MT_DEVICE,
+	}
 };
 
 /* --------------------------------------------------------------------
@@ -255,11 +267,37 @@ static void at91sam9260_reset(void)
  *  AT91SAM9260 processor initialization
  * -------------------------------------------------------------------- */
 
+static void __init at91sam9xe_initialize(void)
+{
+	unsigned long cidr, sram_size;
+
+	cidr = at91_sys_read(AT91_DBGU_CIDR);
+
+	switch (cidr & AT91_CIDR_SRAMSIZ) {
+		case AT91_CIDR_SRAMSIZ_32K:
+			sram_size = 2 * SZ_16K;
+			break;
+		case AT91_CIDR_SRAMSIZ_16K:
+		default:
+			sram_size = SZ_16K;
+	}
+
+	at91sam9xe_sram_desc->virtual = AT91_IO_VIRT_BASE - sram_size;
+	at91sam9xe_sram_desc->length = sram_size;
+
+	iotable_init(at91sam9xe_sram_desc, ARRAY_SIZE(at91sam9xe_sram_desc));
+}
+
 void __init at91sam9260_initialize(unsigned long main_clock)
 {
 	/* Map peripherals */
 	iotable_init(at91sam9260_io_desc, ARRAY_SIZE(at91sam9260_io_desc));
 
+	if (cpu_is_at91sam9xe())
+		at91sam9xe_initialize();
+	else
+		iotable_init(at91sam9260_sram_desc, ARRAY_SIZE(at91sam9260_sram_desc));
+
 	at91_arch_reset = at91sam9260_reset;
 	at91_extern_irq = (1 << AT91SAM9260_ID_IRQ0) | (1 << AT91SAM9260_ID_IRQ1)
 			| (1 << AT91SAM9260_ID_IRQ2);