platform: generic: Allow platform_override to perform firmware init

We add a generic platform override callback to allow platform specific firmware init.

Signed-off-by: Wei Liang Lim <weiliang.lim@starfivetech.com>
Reviewed-by: Chee Hong Ang <cheehong.ang@starfivetech.com>
Reviewed-by: Jun Liang Tan <junliang.tan@starfivetech.com>
Reviewed-by: Anup Patel <anup@brainfault.org>

platform/generic/include/platform_override.h

@@ -26,6 +26,7 @@ struct platform_override {
 	int (*fdt_fixup)(void *fdt, const struct fdt_match *match);
 	int (*extensions_init)(const struct fdt_match *match,
 			       struct sbi_hart_features *hfeatures);
+	void (*fw_init)(void *fdt, const struct fdt_match *match);
 	int (*vendor_ext_check)(long extid, const struct fdt_match *match);
 	int (*vendor_ext_provider)(long extid, long funcid,
 				   const struct sbi_trap_regs *regs,

platform/generic/platform.c

@@ -85,6 +85,9 @@ unsigned long fw_platform_init(unsigned long arg0, unsigned long arg1,
 
 	fw_platform_lookup_special(fdt, root_offset);
 
+	if (generic_plat && generic_plat->fw_init)
+		generic_plat->fw_init(fdt, generic_plat_match);
+
 	model = fdt_getprop(fdt, root_offset, "model", &len);
 	if (model)
 		sbi_strncpy(platform.name, model, sizeof(platform.name) - 1);