diff -drupN a/tools/pm-sleep/include/uart.h b/tools/pm-sleep/include/uart.h
--- a/tools/pm-sleep/include/uart.h	1970-01-01 03:00:00.000000000 +0300
+++ b/tools/pm-sleep/include/uart.h	2022-06-09 05:02:37.000000000 +0300
@@ -0,0 +1,17 @@
+#ifndef __UART_H__
+#define __UART_H__
+#define TCSM_DELAY(x)								\
+	do{												\
+		register unsigned int i = x;				\
+		while(i--)									\
+			__asm__ volatile(".set push      \n\t"	\
+							 ".set mips32\n\t"		\
+							 "nop\n\t"				\
+							 ".set mips32\n\t"		\
+		                     ".set pop      \n\t");	\
+	}while(0)
+
+void serial_putc(char x);
+void serial_put_hex(unsigned int x);
+void serial_setid(int uart_id);
+#endif	/* __UART_H__ */