/* SPDX-License-Identifier: GPL-2.0+ */
  /*

   * Copyright (c) 2004 Simtec Electronics
   *	Ben Dooks <ben@simtec.co.uk>
   *
   * S3C2410 Power Manager (Suspend-To-RAM) support
   *
   * Based on PXA/SA1100 sleep code by:
   *	Nicolas Pitre, (c) 2002 Monta Vista Software Inc
   *	Cliff Brake, (c) 2001

   */

  #include <linux/linkage.h>

  #include <linux/serial_s3c.h>

  #include <asm/assembler.h>

  #include "map.h"

  #include "regs-gpio.h"
  #include "regs-clock.h"

  #include "regs-mem-s3c24xx.h"

  	/* s3c2410_cpu_suspend

  	 *

  	 * put the cpu into sleep mode

  	*/

  ENTRY(s3c2410_cpu_suspend)
  	@@ prepare cpu to sleep
  
  	ldr	r4, =S3C2410_REFRESH
  	ldr	r5, =S3C24XX_MISCCR
  	ldr	r6, =S3C2410_CLKCON

  	ldr	r7, [r4]		@ get REFRESH (and ensure in TLB)
  	ldr	r8, [r5]		@ get MISCCR (and ensure in TLB)
  	ldr	r9, [r6]		@ get CLKCON (and ensure in TLB)

  
  	orr	r7, r7, #S3C2410_REFRESH_SELF	@ SDRAM sleep command
  	orr	r8, r8, #S3C2410_MISCCR_SDSLEEP @ SDRAM power-down signals
  	orr	r9, r9, #S3C2410_CLKCON_POWER	@ power down command
  
  	teq	pc, #0			@ first as a trial-run to load cache
  	bl	s3c2410_do_sleep
  	teq	r0, r0			@ now do it for real
  	b	s3c2410_do_sleep	@
  
  	@@ align next bit of code to cache line

  	.align	5

  s3c2410_do_sleep:

  	streq	r7, [r4]			@ SDRAM sleep command
  	streq	r8, [r5]			@ SDRAM power-down config
  	streq	r9, [r6]			@ CPU sleep

  1:	beq	1b

  	ret	lr