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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/boards/mach-ecovec24/sdram.S
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/* SPDX-License-Identifier: GPL-2.0

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 *

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 * Ecovec24 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(ecovec24_sdram_enter_start)

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	/* DBSC: put memory in self-refresh mode */

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	ED 0xFD000010, 0x00000000 /* DBEN */

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	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */

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	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

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	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

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	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */

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	rts

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	 nop

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ENTRY(ecovec24_sdram_enter_end)

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	.balign 4

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ENTRY(ecovec24_sdram_leave_start)

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	mov.l	@(SH_SLEEP_MODE, r5), r0

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	tst	#SUSP_SH_RSTANDBY, r0

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	bf	resume_rstandby

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	/* DBSC: put memory in auto-refresh mode */

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	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */

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	WAIT 1

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	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

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	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

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	ED 0xFD000010, 0x00000001 /* DBEN */

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	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */

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	rts

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	 nop

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resume_rstandby:

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	/* DBSC: re-initialize and put in auto-refresh */

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	ED 0xFD000108, 0x00000181 /* DBPDCNT0 */

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	ED 0xFD000020, 0x015B0002 /* DBCONF */

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	ED 0xFD000030, 0x03071502 /* DBTR0 */

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	ED 0xFD000034, 0x02020102 /* DBTR1 */

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	ED 0xFD000038, 0x01090405 /* DBTR2 */

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	ED 0xFD00003C, 0x00000002 /* DBTR3 */

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	ED 0xFD000008, 0x00000005 /* DBKIND */

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	ED 0xFD000040, 0x00000001 /* DBRFPDN0 */

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	ED 0xFD000040, 0x00000000 /* DBRFPDN0 */

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	ED 0xFD000018, 0x00000001 /* DBCKECNT */

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	mov	#100,r0

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WAIT_400NS:

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	dt	r0

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	bf	WAIT_400NS

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	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

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	ED 0xFD000060, 0x00020000 /* DBMRCNT (EMR2) */

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	ED 0xFD000060, 0x00030000 /* DBMRCNT (EMR3) */

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	ED 0xFD000060, 0x00010004 /* DBMRCNT (EMR) */

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	ED 0xFD000060, 0x00000532 /* DBMRCNT (MRS) */

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	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

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	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

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	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

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	ED 0xFD000060, 0x00000432 /* DBMRCNT (MRS) */

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	ED 0xFD000060, 0x000103c0 /* DBMRCNT (EMR) */

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	ED 0xFD000060, 0x00010040 /* DBMRCNT (EMR) */

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	mov	#100,r0

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WAIT_400NS_2:

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	dt	r0

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	bf	WAIT_400NS_2

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	ED 0xFD000010, 0x00000001 /* DBEN */

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	ED 0xFD000044, 0x0000050f /* DBRFPDN1 */

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	ED 0xFD000048, 0x236800e6 /* DBRFPDN2 */

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	mov.l	DUMMY,r0

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	mov.l	@r0, r1 /* force single dummy read */

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	ED 0xFD000014, 0x00000002 /* DBCMDCNT (PALL) */

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	ED 0xFD000014, 0x00000004 /* DBCMDCNT (REF) */

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	ED 0xFD000108, 0x00000080 /* DBPDCNT0 */

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	ED 0xFD000040, 0x00010000 /* DBRFPDN0 */

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	rts

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	 nop

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	.balign 4

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DUMMY:	.long	0xac400000

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ENTRY(ecovec24_sdram_leave_end)

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