nds32: Support AG101P serial DM.

Support AG101P serial device tree flow.

Signed-off-by: rick <rick@andestech.com>

arch/Kconfig

@@ -43,6 +43,7 @@ config MIPS
 
 config NDS32
 	bool "NDS32 architecture"
+	select SUPPORT_OF_CONTROL
 
 config NIOS2
 	bool "Nios II architecture"

arch/nds32/cpu/n1213/start.S

@@ -161,9 +161,13 @@ update_gp:
  */
 call_board_init_f:
 	li		$sp, CONFIG_SYS_INIT_SP_ADDR
-	li		$r10, GD_SIZE	/* get GD size */
+	move	$r0, $sp
-	sub		$sp, $sp, $r10	/* GD start addr */
+	bal	board_init_f_alloc_reserve
-	move	$r10, $sp
+	move	$sp, $r0
+	bal	board_init_f_init_reserve
+#ifdef CONFIG_DEBUG_UART
+	bal	debug_uart_init
+#endif
 	li		$r0, 0x00000000
 
 #ifdef __PIC__

arch/nds32/dts/Makefile

@@ -0,0 +1,14 @@
+#
+# SPDX-License-Identifier:	GPL-2.0+
+#
+
+dtb-$(CONFIG_TARGET_ADP_AG101P) += ag101p.dtb
+targets += $(dtb-y)
+
+DTC_FLAGS += -R 4 -p 0x1000
+
+PHONY += dtbs
+dtbs: $(addprefix $(obj)/, $(dtb-y))
+	@:
+
+clean-files := *.dtb

arch/nds32/dts/ag101p.dts

@@ -0,0 +1,49 @@
+/dts-v1/;
+/ {
+	compatible = "nds32 ag101p";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&intc>;
+
+	aliases {
+		uart0 = &serial0;
+	} ;
+
+	chosen {
+		/* bootargs = "console=ttyS0,38400n8 earlyprintk=uart8250-32bit,0x99600000 debug bootmem_debug memblock=debug loglevel=7"; */
+		bootargs = "console=ttyS0,38400n8 earlyprintk=uart8250-32bit,0x99600000 debug loglevel=7";
+		stdout-path = "uart0:38400n8";
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x40000000>;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cpu@0 {
+			compatible = "andestech,n13";
+			reg = <0>;
+			/* FIXME: to fill correct frqeuency */
+			clock-frequency = <60000000>;
+		};
+	};
+
+	intc: interrupt-controller {
+		compatible = "andestech,atnointc010";
+		#interrupt-cells = <1>;
+		interrupt-controller;
+	};
+
+	serial0: serial@99600000 {
+		compatible = "andestech,uart16550", "ns16550a";
+		reg = <0x99600000 0x1000>;
+		interrupts = <7 4>;
+		clock-frequency = <14745600>;
+		reg-shift = <2>;
+		no-loopback-test = <1>;
+	};
+
+};

arch/nds32/include/asm/config.h

@@ -8,5 +8,6 @@
 
 #ifndef _ASM_CONFIG_H_
 #define _ASM_CONFIG_H_
+#define CONFIG_LMB
 
 #endif

arch/nds32/lib/bootm.c

@@ -14,6 +14,12 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+int arch_fixup_fdt(void *blob)
+{
+	return 0;
+}
+
+
 #if defined(CONFIG_SETUP_MEMORY_TAGS) || \
 	defined(CONFIG_CMDLINE_TAG) || \
 	defined(CONFIG_INITRD_TAG) || \

configs/adp-ag101p_defconfig

@@ -1,5 +1,7 @@
 CONFIG_NDS32=y
 CONFIG_TARGET_ADP_AG101P=y
+CONFIG_DEFAULT_DEVICE_TREE="ag101p"
+CONFIG_FIT=y
 CONFIG_BOOTDELAY=3
 CONFIG_SYS_PROMPT="NDS32 # "
 CONFIG_CMD_MMC=y
@@ -12,4 +14,7 @@ CONFIG_CMD_FAT=y
 CONFIG_MMC=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_BAUDRATE=38400
+CONFIG_OF_CONTROL=y
+CONFIG_DM=y
+CONFIG_DM_SERIAL=y
 CONFIG_SYS_NS16550=y

include/configs/adp-ag101p.h

@@ -20,8 +20,6 @@
 
 #define CONFIG_SKIP_LOWLEVEL_INIT
 
-#define CONFIG_SYS_GENERIC_GLOBAL_DATA
-
 /*
  * Definitions related to passing arguments to kernel.
  */
@@ -35,6 +33,10 @@
 
 #ifdef CONFIG_SKIP_LOWLEVEL_INIT
 #define CONFIG_SYS_TEXT_BASE	0x00500000
+#ifdef CONFIG_OF_CONTROL
+#undef CONFIG_OF_SEPARATE
+#define CONFIG_OF_EMBED
+#endif
 #else
 #ifdef CONFIG_MEM_REMAP
 #define CONFIG_SYS_TEXT_BASE	0x80000000
@@ -87,7 +89,9 @@
 #define CONFIG_CONS_INDEX		1
 #define CONFIG_SYS_NS16550_SERIAL
 #define CONFIG_SYS_NS16550_COM1		CONFIG_FTUART010_02_BASE
+#ifndef CONFIG_DM_SERIAL
 #define CONFIG_SYS_NS16550_REG_SIZE	-4
+#endif
 #define CONFIG_SYS_NS16550_CLK		((18432000 * 20) / 25)	/* AG101P */
 
 /*