1 /* linux/arch/arm/mach-s3c2410/sleep.S
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
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 #include <linux/linkage.h>
28 #include <asm/assembler.h>
29 #include <mach/hardware.h>
32 #include <mach/regs-gpio.h>
33 #include <mach/regs-clock.h>
34 #include <plat/regs-serial.h>
38 /* s3c2410_cpu_suspend
40 * put the cpu into sleep mode
43 ENTRY(s3c2410_cpu_suspend)
44 @@ prepare cpu to sleep
46 ldr r4, =S3C2410_REFRESH
47 ldr r5, =S3C24XX_MISCCR
48 ldr r6, =S3C2410_CLKCON
49 ldr r7, [r4] @ get REFRESH (and ensure in TLB)
50 ldr r8, [r5] @ get MISCCR (and ensure in TLB)
51 ldr r9, [r6] @ get CLKCON (and ensure in TLB)
53 orr r7, r7, #S3C2410_REFRESH_SELF @ SDRAM sleep command
54 orr r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals
55 orr r9, r9, #S3C2410_CLKCON_POWER @ power down command
57 teq pc, #0 @ first as a trial-run to load cache
59 teq r0, r0 @ now do it for real
62 @@ align next bit of code to cache line
65 streq r7, [r4] @ SDRAM sleep command
66 streq r8, [r5] @ SDRAM power-down config
67 streq r9, [r6] @ CPU sleep