ARM: at91/soc: add basic support for new sama5d2 SoC

Add Kconfig entries, header file changes and addition to the documentation.
The early debug infrastructure is also added for easy development.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

7 files changed, 35 insertions, 1 deletions

diff --git a/Documentation/arm/Atmel/README b/Documentation/arm/Atmel/README
index c53a19b4aab2..0931cf7e2e56 100644
--- a/Documentation/arm/Atmel/README
+++ b/Documentation/arm/Atmel/README
@@ -90,6 +90,11 @@ the Atmel website: http://www.atmel.com.
         + Datasheet
           http://www.atmel.com/Images/Atmel-11238-32-bit-Cortex-A5-Microcontroller-SAMA5D4_Datasheet.pdf
 
+      - sama5d2 family
+        - sama5d27
+        + Datasheet
+          Coming soon
+
 
 Linux kernel information
 ------------------------
diff --git a/Documentation/devicetree/bindings/arm/atmel-at91.txt b/Documentation/devicetree/bindings/arm/atmel-at91.txt
index 424ac8cbfa08..7f04b8ae4ca9 100644
--- a/Documentation/devicetree/bindings/arm/atmel-at91.txt
+++ b/Documentation/devicetree/bindings/arm/atmel-at91.txt
@@ -27,6 +27,8 @@ compatible: must be one of:
     o "atmel,at91sam9xe"
  * "atmel,sama5" for SoCs using a Cortex-A5, shall be extended with the specific
    SoC family:
+    o "atmel,sama5d2" shall be extended with the specific SoC compatible:
+       - "atmel,sama5d27"
     o "atmel,sama5d3" shall be extended with the specific SoC compatible:
        - "atmel,sama5d31"
        - "atmel,sama5d33"
diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
index a2e16f940394..946c8c0fa1fb 100644
--- a/arch/arm/Kconfig.debug
+++ b/arch/arm/Kconfig.debug
@@ -141,6 +141,12 @@ choice
                 depends on ARCH_AT91
                 depends on SOC_SAMA5
 
+        config AT91_DEBUG_LL_DBGU3
+                bool "Kernel low-level debugging on sama5d2"
+                select DEBUG_AT91_UART
+                depends on ARCH_AT91
+                depends on SOC_SAMA5
+
         config DEBUG_BCM2835
                 bool "Kernel low-level debugging on BCM2835 PL011 UART"
                 depends on ARCH_BCM2835
diff --git a/arch/arm/include/debug/at91.S b/arch/arm/include/debug/at91.S
index c3c45e628e33..2556a8801c8c 100644
--- a/arch/arm/include/debug/at91.S
+++ b/arch/arm/include/debug/at91.S
@@ -13,9 +13,12 @@
 #define AT91_DBGU 0xfffff200 /* AT91_BASE_DBGU0 */
 #elif defined(CONFIG_AT91_DEBUG_LL_DBGU1)
 #define AT91_DBGU 0xffffee00 /* AT91_BASE_DBGU1 */
-#else
+#elif defined(CONFIG_AT91_DEBUG_LL_DBGU2)
 /* On sama5d4, use USART3 as low level serial console */
 #define AT91_DBGU 0xfc00c000 /* SAMA5D4_BASE_USART3 */
+#else
+/* On sama5d2, use UART1 as low level serial console */
+#define AT91_DBGU 0xf8020000
 #endif
 
 #ifdef CONFIG_MMU
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index fd95f34945f4..89a755b90db2 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -8,6 +8,18 @@ menuconfig ARCH_AT91
         select SOC_BUS
 
 if ARCH_AT91
+config SOC_SAMA5D2
+        bool "SAMA5D2 family" if ARCH_MULTI_V7
+        select SOC_SAMA5
+        select CACHE_L2X0
+        select HAVE_FB_ATMEL
+        select HAVE_AT91_UTMI
+        select HAVE_AT91_USB_CLK
+        select HAVE_AT91_H32MX
+        select HAVE_AT91_GENERATED_CLK
+        help
+          Select this if ou are using one of Atmel's SAMA5D2 family SoC.
+
 config SOC_SAMA5D3
         bool "SAMA5D3 family" if ARCH_MULTI_V7
         select SOC_SAMA5
diff --git a/arch/arm/mach-at91/sama5.c b/arch/arm/mach-at91/sama5.c
index 41d829d8e7d5..90c3c3051ae7 100644
--- a/arch/arm/mach-at91/sama5.c
+++ b/arch/arm/mach-at91/sama5.c
@@ -18,6 +18,8 @@
 #include "soc.h"
 
 static const struct at91_soc sama5_socs[] = {
+        AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27_EXID_MATCH,
+                 "sama5d27", "sama5d2"),
         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
                  "sama5d31", "sama5d3"),
         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
@@ -64,6 +66,7 @@ DT_MACHINE_START(sama5_dt, "Atmel SAMA5")
 MACHINE_END
 
 static const char *sama5_alt_dt_board_compat[] __initconst = {
+        "atmel,sama5d2",
         "atmel,sama5d4",
         NULL
 };
diff --git a/arch/arm/mach-at91/soc.h b/arch/arm/mach-at91/soc.h
index be23c400596b..8ede0ef86172 100644
--- a/arch/arm/mach-at91/soc.h
+++ b/arch/arm/mach-at91/soc.h
@@ -62,6 +62,9 @@ at91_soc_init(const struct at91_soc *socs);
 #define AT91SAM9XE256_CIDR_MATCH        0x329a93a0
 #define AT91SAM9XE512_CIDR_MATCH        0x329aa3a0
 
+#define SAMA5D2_CIDR_MATCH              0x0a5c08c0
+#define SAMA5D27_EXID_MATCH             0x00000021
+
 #define SAMA5D3_CIDR_MATCH              0x0a5c07c0
 #define SAMA5D31_EXID_MATCH             0x00444300
 #define SAMA5D33_EXID_MATCH             0x00414300