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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/boards/mach-ap325rxa/sdram.S
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/* SPDX-License-Identifier: GPL-2.0

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 *

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 * AP325RXA sdram self/auto-refresh setup code

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 *

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 *  Copyright (C) 2009 Magnus Damm

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 */

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#include <linux/sys.h>

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#include <linux/errno.h>

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#include <linux/linkage.h>

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#include <asm/asm-offsets.h>

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#include <asm/suspend.h>

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#include <asm/romimage-macros.h>

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/* code to enter and leave self-refresh. must be self-contained.

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 * this code will be copied to on-chip memory and executed from there.

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 */

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	.balign 4

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ENTRY(ap325rxa_sdram_enter_start)

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	/* SBSC: disable power down and put in self-refresh mode */

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	mov.l	1f, r4

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	mov.l	2f, r1

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	mov.l	@r4, r2

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	or	r1, r2

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	mov.l   3f, r3

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	and	r3, r2

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	mov.l	r2, @r4

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	rts

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	 nop

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	.balign 4

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1:	.long	0xfe400008 /* SDCR0 */

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2:	.long	0x00000400

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3:	.long	0xffff7fff

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ENTRY(ap325rxa_sdram_enter_end)

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	.balign 4

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ENTRY(ap325rxa_sdram_leave_start)

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	/* SBSC: set auto-refresh mode */

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	mov.l	1f, r4

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	mov.l	@r4, r0

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	mov.l   4f, r1

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	and	r1, r0

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	mov.l	r0, @r4

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	mov.l	6f, r4

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	mov.l	8f, r0

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	mov.l	@r4, r1

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	mov	#-1, r4

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	add	r4, r1

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	or	r1, r0

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	mov.l	7f, r1

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	mov.l	r0, @r1

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	rts

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	 nop

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	.balign 4

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1:	.long	0xfe400008 /* SDCR0 */

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4:	.long	0xfffffbff

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6:	.long   0xfe40001c /* RTCOR */

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7:	.long   0xfe400018 /* RTCNT */

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8:	.long   0xa55a0000

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ENTRY(ap325rxa_sdram_leave_end)

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