plat: rcar: Pass DTB with DRAM layout from BL2 to next stages

Pass DTB containing DRAM layout from BL2 to BL33 via register x3, so
that the BL33 can simply consume it and get accurate DRAM layout info.
BL33 is in most usecases U-Boot.
Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>

plat/renesas/rcar/bl2_plat_mem_params_desc.c

@@ -8,6 +8,7 @@
 #include <desc_image_load.h>
 #include <platform.h>
 #include <platform_def.h>
+#include <xlat_tables_defs.h>
 
 #if (RCAR_BL33_EXECUTION_EL != 0) && (RCAR_BL33_EXECUTION_EL != 1)
 #error
@@ -19,6 +20,8 @@
 #define BL33_MODE MODE_EL2
 #endif
 
+extern uint64_t fdt_blob[PAGE_SIZE_4KB / sizeof(uint64_t)];
+
 static bl_mem_params_node_t bl2_mem_params_descs[] = {
 	{
 		.image_id = BL31_IMAGE_ID,
@@ -69,6 +72,7 @@ static bl_mem_params_node_t bl2_mem_params_descs[] = {
 #ifdef RCAR_BL33_ARG0
 		.ep_info.args.arg0 = RCAR_BL33_ARG0,
 #endif
+		.ep_info.args.arg3 = (uintptr_t)fdt_blob,
 		SET_STATIC_PARAM_HEAD(image_info, PARAM_EP, VERSION_2,
 			image_info_t, 0),
 		.image_info.image_max_size =

plat/renesas/rcar/bl2_plat_setup.c

@@ -10,10 +10,12 @@
 #include <bl1.h>
 #include <console.h>
 #include <debug.h>
+#include <libfdt.h>
 #include <mmio.h>
 #include <platform.h>
 #include <platform_def.h>
 #include <string.h>
+#include <xlat_tables_defs.h>
 
 #include "avs_driver.h"
 #include "boot_init_dram.h"
@@ -85,6 +87,32 @@ CASSERT((PARAMS_BASE + sizeof(bl2_to_bl31_params_mem_t) + 0x100)
 
 static meminfo_t bl2_tzram_layout __aligned(CACHE_WRITEBACK_GRANULE);
 
+/* FDT with DRAM configuration */
+uint64_t fdt_blob[PAGE_SIZE_4KB / sizeof(uint64_t)];
+static void *fdt = (void *)fdt_blob;
+
+static void unsigned_num_print(unsigned long long int unum, unsigned int radix,
+				char *string)
+{
+	/* Just need enough space to store 64 bit decimal integer */
+	char num_buf[20];
+	int i = 0;
+	unsigned int rem;
+
+	do {
+		rem = unum % radix;
+		if (rem < 0xa)
+			num_buf[i] = '0' + rem;
+		else
+			num_buf[i] = 'a' + (rem - 0xa);
+		i++;
+		unum /= radix;
+	} while (unum > 0U);
+
+	while (--i >= 0)
+		*string++ = num_buf[i];
+}
+
 #if (RCAR_LOSSY_ENABLE == 1)
 typedef struct bl2_lossy_info {
 	uint32_t magic;
@@ -302,8 +330,10 @@ meminfo_t *bl2_plat_sec_mem_layout(void)
 
 static void bl2_advertise_dram_entries(uint64_t dram_config[8])
 {
+	char nodename[32] = { 0 };
 	uint64_t start, size;
-	int chan;
+	uint64_t fdtsize;
+	int ret, node, chan;
 
 	for (chan = 0; chan < 4; chan++) {
 		start = dram_config[2 * chan];
@@ -314,6 +344,54 @@ static void bl2_advertise_dram_entries(uint64_t dram_config[8])
 		NOTICE("BL2: CH%d: %llx - %llx, %lld GiB\n",
 			chan, start, start + size - 1, size >> 30);
 	}
+
+	/*
+	 * We add the DT nodes in reverse order here. The fdt_add_subnode()
+	 * adds the DT node before the first existing DT node, so we have
+	 * to add them in reverse order to get nodes sorted by address in
+	 * the resulting DT.
+	 */
+	for (chan = 3; chan >= 0; chan--) {
+		start = dram_config[2 * chan];
+		size = dram_config[2 * chan + 1];
+		if (!size)
+			continue;
+
+		/*
+		 * Channel 0 is mapped in 32bit space and the first
+		 * 128 MiB are reserved
+		 */
+		if (chan == 0) {
+			start = 0x48000000;
+			size -= 0x8000000;
+		}
+
+		fdtsize = cpu_to_fdt64(size);
+
+		snprintf(nodename, sizeof(nodename), "memory@");
+		unsigned_num_print(start, 16, nodename + strlen(nodename));
+		node = ret = fdt_add_subnode(fdt, 0, nodename);
+		if (ret < 0)
+			goto err;
+
+		ret = fdt_setprop_string(fdt, node, "device_type", "memory");
+		if (ret < 0)
+			goto err;
+
+		ret = fdt_setprop_u64(fdt, node, "reg", start);
+		if (ret < 0)
+			goto err;
+
+		ret = fdt_appendprop(fdt, node, "reg", &fdtsize,
+				     sizeof(fdtsize));
+		if (ret < 0)
+			goto err;
+	}
+
+	return;
+err:
+	NOTICE("BL2: Cannot add memory node to FDT (ret=%i)\n", ret);
+	panic();
 }
 
 static void bl2_advertise_dram_size(uint32_t product)
@@ -591,6 +669,13 @@ lcm_state:
 		rcar_qos_init();
 	}
 
+	/* Set up FDT */
+	ret = fdt_create_empty_tree(fdt, sizeof(fdt_blob));
+	if (ret) {
+		NOTICE("BL2: Cannot allocate FDT for U-Boot (ret=%i)\n", ret);
+		panic();
+	}
+
 	/* Print DRAM layout */
 	bl2_advertise_dram_size(product);
 
@@ -650,6 +735,9 @@ lcm_state:
 			  LOSSY_FMT2, LOSSY_ENA_DIS2);
 #endif
 
+	fdt_pack(fdt);
+	NOTICE("BL2: FDT at %p\n", fdt);
+
 	if (boot_dev == MODEMR_BOOT_DEV_EMMC_25X1 ||
 	    boot_dev == MODEMR_BOOT_DEV_EMMC_50X8)
 		rcar_io_emmc_setup();

plat/renesas/rcar/platform.mk

@@ -303,6 +303,7 @@ ERRATA_A57_813419  := 1
 include drivers/staging/renesas/rcar/ddr/ddr.mk
 include drivers/staging/renesas/rcar/qos/qos.mk
 include drivers/staging/renesas/rcar/pfc/pfc.mk
+include lib/libfdt/libfdt.mk
 
 PLAT_INCLUDES	:=	-Iinclude/common/tbbr			\
 			-Idrivers/staging/renesas/rcar/ddr	\
@@ -331,6 +332,7 @@ RCAR_GIC_SOURCES	:=	drivers/arm/gic/common/gic_common.c	\
 BL2_SOURCES	+=	${RCAR_GIC_SOURCES}				\
 			lib/cpus/aarch64/cortex_a53.S			\
 			lib/cpus/aarch64/cortex_a57.S			\
+			${LIBFDT_SRCS}					\
 			common/desc_image_load.c			\
 			plat/renesas/rcar/aarch64/platform_common.c	\
 			plat/renesas/rcar/aarch64/plat_helpers.S	\