sleep-s3c2410.S (1322B)
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