[PATCH 5/6] ARM: at91: add ram controller DT support

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

We can now drop the call to ioremap_registers() as we have the binding for the
SDRAM/DDR Controller.

Drop ioremap_registers() for sam9x5 too.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
---
 .../devicetree/bindings/arm/atmel-at91.txt         |   19 ++++++++++++++
 arch/arm/boot/dts/at91sam9g20.dtsi                 |    5 +++
 arch/arm/boot/dts/at91sam9g45.dtsi                 |    6 ++++
 arch/arm/boot/dts/at91sam9x5.dtsi                  |    5 +++
 arch/arm/mach-at91/at91sam9x5.c                    |    6 ----
 arch/arm/mach-at91/include/mach/at91sam9x5.h       |    5 ---
 arch/arm/mach-at91/setup.c                         |   27 +++++++++++++++++--
 7 files changed, 59 insertions(+), 14 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
index a64f867..1f87820 100644
--- a/Documentation/devicetree/bindings/arm/atmel-at91.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt
@@ -42,3 +42,22 @@ Example:
 		compatible = "atmel,at91sam9260-rstc";
 		reg = <0xfffffd00 0x10>;
 	};
+
+RAMC SDRAM/DDR Controller required properties:
+- compatible: Should be "atmel,at91sam9260-sdramc",
+			"atmel,at91sam9g45-ddramc",
+- reg: Should contain registers location and length
+  For at91sam9263 and at91sam9g45 you must specify 2 entries.
+
+Examples:
+
+	ramc0: ramc@ffffe800 {
+		compatible = "atmel,at91sam9g45-ddramc";
+		reg = <0xffffe800 0x200>;
+	};
+
+	ramc0: ramc@ffffe400 {
+		compatible = "atmel,at91sam9g45-ddramc";
+		reg = <0xffffe400 0x200
+		       0xffffe600 0x200>;
+	};
diff --git a/arch/arm/boot/dts/at91sam9g20.dtsi b/arch/arm/boot/dts/at91sam9g20.dtsi
index 5414347..573ac5a 100644
--- a/arch/arm/boot/dts/at91sam9g20.dtsi
+++ b/arch/arm/boot/dts/at91sam9g20.dtsi
@@ -59,6 +59,11 @@
 				reg = <0xfffff000 0x200>;
 			};
 
+			ramc0: ramc@ffffea00 {
+				compatible = "atmel,at91sam9260-sdramc";
+				reg = <0xffffea00 0x200>;
+			};
+
 			pmc: pmc@fffffc00 {
 				compatible = "atmel,at91rm9200-pmc";
 				reg = <0xfffffc00 0x100>;
diff --git a/arch/arm/boot/dts/at91sam9g45.dtsi b/arch/arm/boot/dts/at91sam9g45.dtsi
index e2ccba5..6da07a9 100644
--- a/arch/arm/boot/dts/at91sam9g45.dtsi
+++ b/arch/arm/boot/dts/at91sam9g45.dtsi
@@ -60,6 +60,12 @@
 				reg = <0xfffff000 0x200>;
 			};
 
+			ramc0: ramc@ffffe400 {
+				compatible = "atmel,at91sam9g45-ddramc";
+				reg = <0xffffe400 0x200
+				       0xffffe600 0x200>;
+			};
+
 			pmc: pmc@fffffc00 {
 				compatible = "atmel,at91rm9200-pmc";
 				reg = <0xfffffc00 0x100>;
diff --git a/arch/arm/boot/dts/at91sam9x5.dtsi b/arch/arm/boot/dts/at91sam9x5.dtsi
index 54e3030..09bc806 100644
--- a/arch/arm/boot/dts/at91sam9x5.dtsi
+++ b/arch/arm/boot/dts/at91sam9x5.dtsi
@@ -58,6 +58,11 @@
 				reg = <0xfffff000 0x200>;
 			};
 
+			ramc0: ramc@ffffe800 {
+				compatible = "atmel,at91sam9g45-ddramc";
+				reg = <0xffffe800 0x200>;
+			};
+
 			pmc: pmc@fffffc00 {
 				compatible = "atmel,at91rm9200-pmc";
 				reg = <0xfffffc00 0x100>;
diff --git a/arch/arm/mach-at91/at91sam9x5.c b/arch/arm/mach-at91/at91sam9x5.c
index 0b82c34..b6831ee 100644
--- a/arch/arm/mach-at91/at91sam9x5.c
+++ b/arch/arm/mach-at91/at91sam9x5.c
@@ -302,11 +302,6 @@ static void __init at91sam9x5_map_io(void)
 	at91_init_sram(0, AT91SAM9X5_SRAM_BASE, AT91SAM9X5_SRAM_SIZE);
 }
 
-static void __init at91sam9x5_ioremap_registers(void)
-{
-	at91_ioremap_ramc(0, AT91SAM9X5_BASE_DDRSDRC0, 512);
-}
-
 void __init at91sam9x5_initialize(void)
 {
 	at91_extern_irq = (1 << AT91SAM9X5_ID_IRQ0);
@@ -359,7 +354,6 @@ static unsigned int at91sam9x5_default_irq_priority[NR_AIC_IRQS] __initdata = {
 struct at91_init_soc __initdata at91sam9x5_soc = {
 	.map_io = at91sam9x5_map_io,
 	.default_irq_priority = at91sam9x5_default_irq_priority,
-	.ioremap_registers = at91sam9x5_ioremap_registers,
 	.register_clocks = at91sam9x5_register_clocks,
 	.init = at91sam9x5_initialize,
 };
diff --git a/arch/arm/mach-at91/include/mach/at91sam9x5.h b/arch/arm/mach-at91/include/mach/at91sam9x5.h
index a297a77..88e43d5 100644
--- a/arch/arm/mach-at91/include/mach/at91sam9x5.h
+++ b/arch/arm/mach-at91/include/mach/at91sam9x5.h
@@ -55,11 +55,6 @@
 #define AT91SAM9X5_BASE_USART2	0xf8024000
 
 /*
- * System Peripherals
- */
-#define AT91SAM9X5_BASE_DDRSDRC0	0xffffe800
-
-/*
  * Base addresses for early serial code (uncompress.h)
  */
 #define AT91_DBGU	AT91_BASE_DBGU0
diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c
index 3e48b59..f86450d 100644
--- a/arch/arm/mach-at91/setup.c
+++ b/arch/arm/mach-at91/setup.c
@@ -315,12 +315,33 @@ static void at91_dt_rstc(void)
 	of_node_put(np);
 }
 
+static struct of_device_id ramc_ids[] = {
+	{ .compatible = "atmel,at91sam9260-sdramc" },
+	{ .compatible = "atmel,at91sam9g45-ddramc" },
+	{ /*sentinel*/ }
+};
+
+static void at91_dt_ramc(void)
+{
+	struct device_node *np;
+
+	np = of_find_matching_node(NULL, ramc_ids);
+	if (!np)
+		panic("unable to find compatible ram conroller node in dtb\n");
+
+	at91_ramc_base[0] = of_iomap(np, 0);
+	if (!at91_ramc_base[0])
+		panic("unable to map ramc[0] cpu registers\n");
+	/* the controller may have 2 banks */
+	at91_ramc_base[1] = of_iomap(np, 1);
+
+	of_node_put(np);
+}
+
 void __init at91_dt_initialize(void)
 {
 	at91_dt_rstc();
-
-	/* temporary until have the ramc binding*/
-	at91_boot_soc.ioremap_registers();
+	at91_dt_ramc();
 
 	/* Init clock subsystem */
 	at91_dt_clock_init();
-- 
1.7.7