AOSCOS: LoongArch: Add ACPI compatibility for ISA I/O space reservation

This patch adds essential compatibility support for ACPI-based systems
running on older firmware. Many older computers with old firmware still
rely on this mechanism and are unlikely to receive futher firmeware updates.
This change ensures proper ISA I/O space reservation across for them.

Signed-off-by: Yinan Qin <a.elysia@proton.me>

Author: elysia-best

arch/loongarch/kernel/setup.c

@@ -510,36 +510,49 @@ static int __init add_legacy_isa_io(struct fwnode_handle *fwnode,
 static __init int arch_reserve_pio_range(void)
 {
 	struct device_node *np;
+	struct fwnode_handle *fwnode;
 
-	for_each_node_by_name(np, "isa") {
-		struct of_range range;
-		struct of_range_parser parser;
+	if (acpi_disabled) {
+		for_each_node_by_name(np, "isa") {
+			struct of_range range;
+			struct of_range_parser parser;
 
-		pr_info("ISA Bridge: %pOF\n", np);
+			pr_info("ISA Bridge: %pOF\n", np);
 
-		if (of_range_parser_init(&parser, np)) {
-			pr_info("Failed to parse resources.\n");
-			of_node_put(np);
-			break;
-		}
-
-		for_each_of_range(&parser, &range) {
-			switch (range.flags & IORESOURCE_TYPE_BITS) {
-			case IORESOURCE_IO:
-				pr_info(" IO 0x%016llx..0x%016llx  ->  0x%016llx\n",
-					range.cpu_addr,
-					range.cpu_addr + range.size - 1,
-					range.bus_addr);
-				if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
-					pr_warn("Failed to reserve legacy IO in Logic PIO\n");
-				break;
-			case IORESOURCE_MEM:
-				pr_info(" MEM 0x%016llx..0x%016llx  ->  0x%016llx\n",
-					range.cpu_addr,
-					range.cpu_addr + range.size - 1,
-					range.bus_addr);
+			if (of_range_parser_init(&parser, np)) {
+				pr_info("Failed to parse resources.\n");
+				of_node_put(np);
 				break;
 			}
+
+			for_each_of_range(&parser, &range) {
+				switch (range.flags & IORESOURCE_TYPE_BITS) {
+				case IORESOURCE_IO:
+					pr_info(" IO 0x%016llx..0x%016llx  ->  0x%016llx\n",
+						range.cpu_addr,
+						range.cpu_addr + range.size - 1,
+						range.bus_addr);
+					if (add_legacy_isa_io(&np->fwnode, range.cpu_addr, range.size))
+						pr_warn("Failed to reserve legacy IO in Logic PIO\n");
+					break;
+				case IORESOURCE_MEM:
+					pr_info(" MEM 0x%016llx..0x%016llx  ->  0x%016llx\n",
+						range.cpu_addr,
+						range.cpu_addr + range.size - 1,
+						range.bus_addr);
+					break;
+				}
+			}
+		}
+	} else {
+		fwnode = acpi_alloc_fwnode_static();
+		if (!fwnode) {
+			pr_warn("Failed to allocate fwnode for legacy ISA\n");
+			return 0;
+		}
+		if (add_legacy_isa_io(fwnode, LOONGSON_LIO_BASE, ISA_IOSIZE)) {	
+			pr_warn("Failed to reserve legacy IO in Logic PIO\n");
+			acpi_free_fwnode_static(fwnode);
 		}
 	}