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 <mach/hardware.h>
17#include <mach/map.h>
18
19#include <mach/regs-gpio.h>
20#include <mach/regs-clock.h>
21
22#include "regs-mem.h"
23
24	/* s3c2410_cpu_suspend
25	 *
26	 * put the cpu into sleep mode
27	*/
28
29ENTRY(s3c2410_cpu_suspend)
30	@@ prepare cpu to sleep
31
32	ldr	r4, =S3C2410_REFRESH
33	ldr	r5, =S3C24XX_MISCCR
34	ldr	r6, =S3C2410_CLKCON
35	ldr	r7, [r4]		@ get REFRESH (and ensure in TLB)
36	ldr	r8, [r5]		@ get MISCCR (and ensure in TLB)
37	ldr	r9, [r6]		@ get CLKCON (and ensure in TLB)
38
39	orr	r7, r7, #S3C2410_REFRESH_SELF	@ SDRAM sleep command
40	orr	r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals
41	orr	r9, r9, #S3C2410_CLKCON_POWER	@ power down command
42
43	teq	pc, #0			@ first as a trial-run to load cache
44	bl	s3c2410_do_sleep
45	teq	r0, r0			@ now do it for real
46	b	s3c2410_do_sleep	@
47
48	@@ align next bit of code to cache line
49	.align	5
50s3c2410_do_sleep:
51	streq	r7, [r4]			@ SDRAM sleep command
52	streq	r8, [r5]			@ SDRAM power-down config
53	streq	r9, [r6]			@ CPU sleep
541:	beq	1b
55	ret	lr
56