rockchip: add an fdt parsing stub for platform param

The Rockchip ATF platform can be entered from both Coreboot and U-Boot.
While Coreboot does submit the list of linked parameter structs as
platform param, upstream u-boot actually always provides a pointer
to a devicetree as parameter.
This results in current ATF not running at all when started from U-Boot.

To fix this, add a stub that checks if the parameter is a fdt so we
can at least boot and not get stuck. Later on we can extend this with
actual parsing of information from the devicetree.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

plat/rockchip/common/params_setup.c

@@ -11,6 +11,7 @@
 #include <common/debug.h>
 #include <drivers/console.h>
 #include <drivers/gpio.h>
+#include <libfdt.h>
 #include <lib/coreboot.h>
 #include <lib/mmio.h>
 #include <plat/common/platform.h>
@@ -27,6 +28,13 @@ static struct gpio_info suspend_gpio[10];
 uint32_t suspend_gpio_cnt;
 static struct apio_info *suspend_apio;
 
+static uint8_t fdt_buffer[0x10000];
+
+void *plat_get_fdt(void)
+{
+	return &fdt_buffer[0];
+}
+
 struct gpio_info *plat_get_rockchip_gpio_reset(void)
 {
 	return rst_gpio;
@@ -49,11 +57,30 @@ struct apio_info *plat_get_rockchip_suspend_apio(void)
 	return suspend_apio;
 }
 
+static int dt_process_fdt(void *blob)
+{
+	void *fdt = plat_get_fdt();
+	int ret;
+
+	ret = fdt_open_into(blob, fdt, 0x10000);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 void params_early_setup(void *plat_param_from_bl2)
 {
 	struct bl31_plat_param *bl2_param;
 	struct bl31_gpio_param *gpio_param;
 
+	/*
+	 * Test if this is a FDT passed as a platform-specific parameter
+	 * block.
+	 */
+	if (!dt_process_fdt(plat_param_from_bl2))
+		return;
+
 	/* keep plat parameters for later processing if need */
 	bl2_param = (struct bl31_plat_param *)plat_param_from_bl2;
 	while (bl2_param) {

plat/rockchip/rk3328/platform.mk

@@ -8,6 +8,8 @@ RK_PLAT			:=	plat/rockchip
 RK_PLAT_SOC		:=	${RK_PLAT}/${PLAT}
 RK_PLAT_COMMON		:=	${RK_PLAT}/common
 
+include lib/libfdt/libfdt.mk
+
 PLAT_INCLUDES		:=	-Idrivers/arm/gic/common/			\
 				-Idrivers/arm/gic/v2/			\
 				-I${RK_PLAT_COMMON}/                            \
@@ -38,6 +40,7 @@ BL31_SOURCES		+=	${RK_GIC_SOURCES}				\
 				drivers/delay_timer/generic_delay_timer.c	\
 				lib/cpus/aarch64/aem_generic.S			\
 				lib/cpus/aarch64/cortex_a53.S			\
+				$(LIBFDT_SRCS)					\
 				${RK_PLAT_COMMON}/drivers/parameter/ddr_parameter.c	\
 				${RK_PLAT_COMMON}/aarch64/plat_helpers.S	\
 				${RK_PLAT_COMMON}/bl31_plat_setup.c		\

plat/rockchip/rk3368/platform.mk

@@ -8,6 +8,8 @@ RK_PLAT			:=	plat/rockchip
 RK_PLAT_SOC		:=	${RK_PLAT}/${PLAT}
 RK_PLAT_COMMON		:=	${RK_PLAT}/common
 
+include lib/libfdt/libfdt.mk
+
 PLAT_INCLUDES		:=	-I${RK_PLAT_COMMON}/				\
 				-I${RK_PLAT_COMMON}/include/			\
 				-I${RK_PLAT_COMMON}/pmusram			\
@@ -35,6 +37,7 @@ BL31_SOURCES		+=	${RK_GIC_SOURCES}				\
 				drivers/delay_timer/delay_timer.c		\
 				drivers/delay_timer/generic_delay_timer.c	\
 				lib/cpus/aarch64/cortex_a53.S			\
+				$(LIBFDT_SRCS)					\
 				${RK_PLAT_COMMON}/aarch64/plat_helpers.S	\
 				${RK_PLAT_COMMON}/bl31_plat_setup.c		\
 				${RK_PLAT_COMMON}/params_setup.c                \

plat/rockchip/rk3399/platform.mk

@@ -8,6 +8,8 @@ RK_PLAT		:=	plat/rockchip
 RK_PLAT_SOC	:=	${RK_PLAT}/${PLAT}
 RK_PLAT_COMMON	:=	${RK_PLAT}/common
 
+include lib/libfdt/libfdt.mk
+
 PLAT_INCLUDES		:=	-I${RK_PLAT_COMMON}/			\
 				-I${RK_PLAT_COMMON}/include/		\
 				-I${RK_PLAT_COMMON}/pmusram		\
@@ -43,6 +45,7 @@ BL31_SOURCES	+=	${RK_GIC_SOURCES}				\
 			drivers/gpio/gpio.c				\
 			lib/cpus/aarch64/cortex_a53.S			\
 			lib/cpus/aarch64/cortex_a72.S			\
+			$(LIBFDT_SRCS)					\
 			${RK_PLAT_COMMON}/aarch64/plat_helpers.S	\
 			${RK_PLAT_COMMON}/bl31_plat_setup.c		\
 			${RK_PLAT_COMMON}/params_setup.c		\