LoongArch: Call irq_find_matching_fwnode get irq domain

LoongArch inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I6BWFP

--------------------------------

Fix patch "LoongArch: Old BPI compatibility"
Signed-off-by: Nliuyun <liuyun@loongson.cn>
Change-Id: I67c2535a86213e620546889a081511eaa499289a

arch/loongarch/kernel/legacy_boot.c

@@ -239,7 +239,11 @@ int setup_legacy_IRQ(void)
 		printk("CPU domain init eror!\n");
 		return -1;
 	}
-	cpu_domain = get_cpudomain();
+	cpu_domain = irq_find_matching_fwnode(cpuintc_handle, DOMAIN_BUS_ANY);
+	if (!cpu_domain) {
+		printk("CPU domain error!\n");
+		return -1;
+	}
 	ret = liointc_acpi_init(cpu_domain, acpi_liointc);
 	if (ret) {
 		printk("Liointc domain init eror!\n");
@@ -269,7 +273,11 @@ int setup_legacy_IRQ(void)
 		pch_msi_parse_madt((union acpi_subtable_headers *)acpi_pchmsi[0], 0);
 	}
 
-	pic_domain = get_pchpic_irq_domain();
+	pic_domain = irq_find_matching_fwnode(pch_pic_handle[0], DOMAIN_BUS_ANY);
+	if (!pic_domain) {
+		printk("Pic domain error!\n");
+		return -1;
+	}
 	if (pic_domain)
 		pch_lpc_acpi_init(pic_domain, acpi_pchlpc);
 

drivers/irqchip/irq-loongarch-cpu.c

@@ -119,11 +119,6 @@ static int __init acpi_cascade_irqdomain_init(void)
 	return 0;
 }
 
-struct irq_domain *get_cpudomain(void)
-{
-	return irq_domain;
-}
-
 int __init cpuintc_acpi_init(union acpi_subtable_headers *header,
 				   const unsigned long end)
 {

drivers/irqchip/irq-loongson-pch-pic.c

@@ -52,11 +52,6 @@ static struct pch_pic *pch_pic_priv[MAX_IO_PICS];
 
 struct fwnode_handle *pch_pic_handle[MAX_IO_PICS];
 
-struct irq_domain *get_pchpic_irq_domain(void)
-{
-	return pch_pic_priv[0]->pic_domain;
-}
-
 static void pch_pic_bitset(struct pch_pic *priv, int offset, int bit)
 {
 	u32 reg;