MIPS: Loongson64: Distinguish firmware dependencies DTB/LEFI

Add DTB boot support, only support Loongson-2K1000 processor
for now, determine whether to use the built-in DTB or the DTB
from the firmware by checking the range of CKSEG0 and XKPHYS.
loongson_fw_interface will be used in the future.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/mach-loongson64/loongson.h

@@ -12,8 +12,14 @@
 #include <linux/irq.h>
 #include <boot_param.h>
 
+enum loongson_fw_interface {
+	LOONGSON_LEFI,
+	LOONGSON_DTB,
+};
+
 /* machine-specific boot configuration */
 struct loongson_system_configuration {
+	enum loongson_fw_interface fw_interface;
 	u32 nr_cpus;
 	u32 nr_nodes;
 	int cores_per_node;
@@ -41,7 +47,8 @@ extern u32 memsize, highmemsize;
 extern const struct plat_smp_ops loongson3_smp_ops;
 
 /* loongson-specific command line, env and memory initialization */
-extern void __init prom_init_env(void);
+extern void __init prom_dtb_init_env(void);
+extern void __init prom_lefi_init_env(void);
 extern void __init szmem(unsigned int node);
 extern void *loongson_fdt_blob;
 

arch/mips/loongson64/env.c

@@ -43,7 +43,18 @@ const char *get_system_type(void)
 	return "Generic Loongson64 System";
 }
 
-void __init prom_init_env(void)
+
+void __init prom_dtb_init_env(void)
+{
+	if ((fw_arg2 < CKSEG0 || fw_arg2 > CKSEG1)
+		&& (fw_arg2 < XKPHYS || fw_arg2 > XKSEG))
+
+		loongson_fdt_blob = __dtb_loongson64_2core_2k1000_begin;
+	else
+		loongson_fdt_blob = (void *)fw_arg2;
+}
+
+void __init prom_lefi_init_env(void)
 {
 	struct boot_params *boot_p;
 	struct loongson_params *loongson_p;

arch/mips/loongson64/init.c

@@ -52,6 +52,10 @@ void __init szmem(unsigned int node)
 	static unsigned long num_physpages;
 	u64 node_id, node_psize, start_pfn, end_pfn, mem_start, mem_size;
 
+	/* Otherwise come from DTB */
+	if (loongson_sysconf.fw_interface != LOONGSON_LEFI)
+		return;
+
 	/* Parse memory information and activate */
 	for (i = 0; i < loongson_memmap->nr_map; i++) {
 		node_id = loongson_memmap->map[i].node_id;
@@ -94,12 +98,20 @@ static void __init prom_init_memory(void)
 void __init prom_init(void)
 {
 	fw_init_cmdline();
-	prom_init_env();
+
+	if (fw_arg2 == 0 || (fdt_magic(fw_arg2) == FDT_MAGIC)) {
+		loongson_sysconf.fw_interface = LOONGSON_DTB;
+		prom_dtb_init_env();
+	} else {
+		loongson_sysconf.fw_interface = LOONGSON_LEFI;
+		prom_lefi_init_env();
+	}
 
 	/* init base address of io space */
 	set_io_port_base(PCI_IOBASE);
 
-	loongson_sysconf.early_config();
+	if (loongson_sysconf.early_config)
+		loongson_sysconf.early_config();
 
 #ifdef CONFIG_NUMA
 	prom_init_numa_memory();