13fa551b5e
Add self-refresh handling code for the Migo-R board. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
70 lines
1.3 KiB
ArmAsm
70 lines
1.3 KiB
ArmAsm
/*
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* Migo-R 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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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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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(migor_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(migor_sdram_enter_end)
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.balign 4
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ENTRY(migor_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(migor_sdram_leave_end)
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