1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (c) 2004 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * S3C2410 Power Manager (Suspend-To-RAM) support
8 * Based on PXA/SA1100 sleep code by:
9 * Nicolas Pitre, (c) 2002 Monta Vista Software Inc
10 * Cliff Brake, (c) 2001
13 #include <linux/linkage.h>
14 #include <linux/serial_s3c.h>
15 #include <asm/assembler.h>
18 #include "regs-gpio.h"
19 #include "regs-clock.h"
21 #include "regs-mem-s3c24xx.h"
23 /* s3c2410_cpu_suspend
25 * put the cpu into sleep mode
28 ENTRY(s3c2410_cpu_suspend)
29 @@ prepare cpu to sleep
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)
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
42 teq pc, #0 @ first as a trial-run to load cache
44 teq r0, r0 @ now do it for real
47 @@ align next bit of code to cache line
50 streq r7, [r4] @ SDRAM sleep command
51 streq r8, [r5] @ SDRAM power-down config
52 streq r9, [r6] @ CPU sleep