LoongArch: Export some arch-specific pm interfaces

Some PMC (Power Management Controllers) need to support DTS and will use
the suspend interfaces thus this patch was to export such interfaces for
their use.

Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

arch/loongarch/include/asm/acpi.h

@@ -8,6 +8,8 @@
 #ifndef _ASM_LOONGARCH_ACPI_H
 #define _ASM_LOONGARCH_ACPI_H
 
+#include <asm/suspend.h>
+
 #ifdef CONFIG_ACPI
 extern int acpi_strict;
 extern int acpi_disabled;
@@ -46,12 +48,10 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu)
 
 extern int loongarch_acpi_suspend(void);
 extern int (*acpi_suspend_lowlevel)(void);
-extern void loongarch_suspend_enter(void);
 
 static inline unsigned long acpi_get_wakeup_address(void)
 {
 #ifdef CONFIG_SUSPEND
-	extern void loongarch_wakeup_start(void);
 	return (unsigned long)loongarch_wakeup_start;
 #endif
 	return 0UL;

arch/loongarch/include/asm/suspend.h

@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_SUSPEND_H
+#define __ASM_SUSPEND_H
+
+void loongarch_common_suspend(void);
+void loongarch_common_resume(void);
+void loongarch_suspend_enter(void);
+void loongarch_wakeup_start(void);
+
+#endif

arch/loongarch/power/suspend.c

@@ -27,7 +27,7 @@ struct saved_registers {
 };
 static struct saved_registers saved_regs;
 
-static void arch_common_suspend(void)
+void loongarch_common_suspend(void)
 {
 	save_counter();
 	saved_regs.pgd = csr_read64(LOONGARCH_CSR_PGDL);
@@ -40,7 +40,7 @@ static void arch_common_suspend(void)
 	loongarch_suspend_addr = loongson_sysconf.suspend_addr;
 }
 
-static void arch_common_resume(void)
+void loongarch_common_resume(void)
 {
 	sync_counter();
 	local_flush_tlb_all();
@@ -62,12 +62,12 @@ int loongarch_acpi_suspend(void)
 	enable_gpe_wakeup();
 	enable_pci_wakeup();
 
-	arch_common_suspend();
+	loongarch_common_suspend();
 
 	/* processor specific suspend */
 	loongarch_suspend_enter();
 
-	arch_common_resume();
+	loongarch_common_resume();
 
 	return 0;
 }