1/* SPDX-License-Identifier: GPL-2.0+ */
 2/*
 3 * Copyright (c) 2004 Simtec Electronics
 4 *	Ben Dooks <ben@simtec.co.uk>
 5 *
 6 * S3C2410 Power Manager (Suspend-To-RAM) support
 7 *
 8 * Based on PXA/SA1100 sleep code by:
 9 *	Nicolas Pitre, (c) 2002 Monta Vista Software Inc
10 *	Cliff Brake, (c) 2001
11 */
12
13#include <linux/linkage.h>
14#include <linux/serial_s3c.h>
15#include <asm/assembler.h>
16#include "map.h"
17
18#include "regs-gpio.h"
19#include "regs-clock.h"
20
21#include "regs-mem-s3c24xx.h"
22
23	/* s3c2410_cpu_suspend
24	 *
25	 * put the cpu into sleep mode
26	*/
27
28ENTRY(s3c2410_cpu_suspend)
29	@@ prepare cpu to sleep
30
31	ldr	r4, =S3C2410_REFRESH
32	ldr	r5, =S3C24XX_MISCCR
33	ldr	r6, =S3C2410_CLKCON
34	ldr	r7, [r4]		@ get REFRESH (and ensure in TLB)
35	ldr	r8, [r5]		@ get MISCCR (and ensure in TLB)
36	ldr	r9, [r6]		@ get CLKCON (and ensure in TLB)
37
38	orr	r7, r7, #S3C2410_REFRESH_SELF	@ SDRAM sleep command
39	orr	r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals
40	orr	r9, r9, #S3C2410_CLKCON_POWER	@ power down command
41
42	teq	pc, #0			@ first as a trial-run to load cache
43	bl	s3c2410_do_sleep
44	teq	r0, r0			@ now do it for real
45	b	s3c2410_do_sleep	@
46
47	@@ align next bit of code to cache line
48	.align	5
49s3c2410_do_sleep:
50	streq	r7, [r4]			@ SDRAM sleep command
51	streq	r8, [r5]			@ SDRAM power-down config
52	streq	r9, [r6]			@ CPU sleep
531:	beq	1b
54	ret	lr