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/* SPDX-License-Identifier: GPL-2.0
*
* MS7724SE sdram self/auto-refresh setup code
*
* Copyright (C) 2009 Magnus Damm
*/
#include <linux/sys.h>
#include <linux/errno.h>
#include <linux/linkage.h>
#include <asm/asm-offsets.h>
#include <asm/suspend.h>
#include <asm/romimage-macros.h>
/* code to enter and leave self-refresh. must be self-contained.
* this code will be copied to on-chip memory and executed from there.
*/
.balign 4
ENTRY(ms7724se_sdram_enter_start)
/* DBSC: put memory in self-refresh mode */
ED 0xFD000010, 0x00000000 /* DBEN */
ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
rts
nop
ENTRY(ms7724se_sdram_enter_end)
.balign 4
ENTRY(ms7724se_sdram_leave_start)
/* DBSC: put memory in auto-refresh mode */
mov.l @(SH_SLEEP_MODE, r5), r0
tst #SUSP_SH_RSTANDBY, r0
bf resume_rstandby
ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
WAIT 1
ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
ED 0xFD000010, 0x00000001 /* DBEN */
ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
rts
nop
resume_rstandby:
/* CPG: setup clocks before restarting external memory */
ED 0xA4150024, 0x00004000 /* PLLCR */
mov.l FRQCRA,r0
mov.l @r0,r3
mov.l KICK,r1
or r1, r3
mov.l r3, @r0
mov.l LSTATS,r0
mov #1,r1
WAIT_LSTATS:
mov.l @r0,r3
tst r1,r3
bf WAIT_LSTATS
/* DBSC: re-initialize and put in auto-refresh */
ED 0xFD000108, 0x00000181 /* DBPDCNT0 */
ED 0xFD000020, 0x015B0002 /* DBCONF */
ED 0xFD000030, 0x03071502 /* DBTR0 */
ED 0xFD000034, 0x02020102 /* DBTR1 */
ED 0xFD000038, 0x01090405 /* DBTR2 */
ED 0xFD00003C, 0x00000002 /* DBTR3 */
ED 0xFD000008, 0x00000005 /* DBKIND */
ED 0xFD000040, 0x00000001 /* DBRFPDN0 */
ED 0xFD000040, 0x00000000 /* DBRFPDN0 */
ED 0xFD000018, 0x00000001 /* DBCKECNT */
mov #100,r0
WAIT_400NS:
dt r0
bf WAIT_400NS
ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */
ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */
ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */
ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */
ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */
ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */
ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */
mov #100,r0
WAIT_400NS_2:
dt r0
bf WAIT_400NS_2
ED 0xFD000010, 0x00000001 /* DBEN */
ED 0xFD000044, 0x0000050f /* DBRFPDN1 */
ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */
mov.l DUMMY,r0
mov.l @r0, r1 /* force single dummy read */
ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */
ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */
ED 0xFD000108, 0x00000080 /* DBPDCNT0 */
ED 0xFD000040, 0x00010000 /* DBRFPDN0 */
rts
nop
.balign 4
DUMMY: .long 0xac400000
FRQCRA: .long 0xa4150000
KICK: .long 0x80000000
LSTATS: .long 0xa4150060
ENTRY(ms7724se_sdram_leave_end)
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